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Commit | Line | Data |
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e114e473 CS |
1 | /* |
2 | * Simplified MAC Kernel (smack) security module | |
3 | * | |
4 | * This file contains the smack hook function implementations. | |
5 | * | |
5c6d1125 | 6 | * Authors: |
e114e473 | 7 | * Casey Schaufler <casey@schaufler-ca.com> |
84088ba2 | 8 | * Jarkko Sakkinen <jarkko.sakkinen@intel.com> |
e114e473 CS |
9 | * |
10 | * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> | |
07feee8f | 11 | * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. |
82c21bfa | 12 | * Paul Moore <paul@paul-moore.com> |
5c6d1125 | 13 | * Copyright (C) 2010 Nokia Corporation |
84088ba2 | 14 | * Copyright (C) 2011 Intel Corporation. |
e114e473 CS |
15 | * |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License version 2, | |
18 | * as published by the Free Software Foundation. | |
19 | */ | |
20 | ||
21 | #include <linux/xattr.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/stat.h> | |
e114e473 CS |
25 | #include <linux/kd.h> |
26 | #include <asm/ioctls.h> | |
07feee8f | 27 | #include <linux/ip.h> |
e114e473 CS |
28 | #include <linux/tcp.h> |
29 | #include <linux/udp.h> | |
c6739443 | 30 | #include <linux/dccp.h> |
d66a8acb | 31 | #include <linux/icmpv6.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
e114e473 CS |
33 | #include <linux/mutex.h> |
34 | #include <linux/pipe_fs_i.h> | |
e114e473 | 35 | #include <net/cipso_ipv4.h> |
c6739443 CS |
36 | #include <net/ip.h> |
37 | #include <net/ipv6.h> | |
d20bdda6 | 38 | #include <linux/audit.h> |
1fd7317d | 39 | #include <linux/magic.h> |
2a7dba39 | 40 | #include <linux/dcache.h> |
16014d87 | 41 | #include <linux/personality.h> |
40401530 AV |
42 | #include <linux/msg.h> |
43 | #include <linux/shm.h> | |
44 | #include <linux/binfmts.h> | |
3bf2789c | 45 | #include <linux/parser.h> |
e114e473 CS |
46 | #include "smack.h" |
47 | ||
5c6d1125 JS |
48 | #define TRANS_TRUE "TRUE" |
49 | #define TRANS_TRUE_SIZE 4 | |
50 | ||
c6739443 CS |
51 | #define SMK_CONNECTING 0 |
52 | #define SMK_RECEIVING 1 | |
53 | #define SMK_SENDING 2 | |
54 | ||
21abb1ec | 55 | #ifdef SMACK_IPV6_PORT_LABELING |
3c7ce342 | 56 | DEFINE_MUTEX(smack_ipv6_lock); |
8b549ef4 | 57 | static LIST_HEAD(smk_ipv6_port_list); |
21abb1ec | 58 | #endif |
1a5b472b | 59 | static struct kmem_cache *smack_inode_cache; |
69f287ae | 60 | int smack_enabled; |
c6739443 | 61 | |
c3300aaf AV |
62 | #define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s} |
63 | static struct { | |
64 | const char *name; | |
65 | int len; | |
66 | int opt; | |
67 | } smk_mount_opts[] = { | |
68 | A(fsdefault), A(fsfloor), A(fshat), A(fsroot), A(fstransmute) | |
3bf2789c | 69 | }; |
c3300aaf AV |
70 | #undef A |
71 | ||
72 | static int match_opt_prefix(char *s, int l, char **arg) | |
73 | { | |
74 | int i; | |
75 | ||
76 | for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) { | |
77 | size_t len = smk_mount_opts[i].len; | |
78 | if (len > l || memcmp(s, smk_mount_opts[i].name, len)) | |
79 | continue; | |
80 | if (len == l || s[len] != '=') | |
81 | continue; | |
82 | *arg = s + len + 1; | |
83 | return smk_mount_opts[i].opt; | |
84 | } | |
85 | return Opt_error; | |
86 | } | |
3bf2789c | 87 | |
3d04c924 CS |
88 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP |
89 | static char *smk_bu_mess[] = { | |
90 | "Bringup Error", /* Unused */ | |
91 | "Bringup", /* SMACK_BRINGUP_ALLOW */ | |
92 | "Unconfined Subject", /* SMACK_UNCONFINED_SUBJECT */ | |
93 | "Unconfined Object", /* SMACK_UNCONFINED_OBJECT */ | |
94 | }; | |
95 | ||
d166c802 CS |
96 | static void smk_bu_mode(int mode, char *s) |
97 | { | |
98 | int i = 0; | |
99 | ||
100 | if (mode & MAY_READ) | |
101 | s[i++] = 'r'; | |
102 | if (mode & MAY_WRITE) | |
103 | s[i++] = 'w'; | |
104 | if (mode & MAY_EXEC) | |
105 | s[i++] = 'x'; | |
106 | if (mode & MAY_APPEND) | |
107 | s[i++] = 'a'; | |
108 | if (mode & MAY_TRANSMUTE) | |
109 | s[i++] = 't'; | |
110 | if (mode & MAY_LOCK) | |
111 | s[i++] = 'l'; | |
112 | if (i == 0) | |
113 | s[i++] = '-'; | |
114 | s[i] = '\0'; | |
115 | } | |
116 | #endif | |
117 | ||
118 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
119 | static int smk_bu_note(char *note, struct smack_known *sskp, |
120 | struct smack_known *oskp, int mode, int rc) | |
d166c802 CS |
121 | { |
122 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
123 | ||
124 | if (rc <= 0) | |
125 | return rc; | |
bf4b2fee CS |
126 | if (rc > SMACK_UNCONFINED_OBJECT) |
127 | rc = 0; | |
d166c802 CS |
128 | |
129 | smk_bu_mode(mode, acc); | |
bf4b2fee | 130 | pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc], |
21c7eae2 | 131 | sskp->smk_known, oskp->smk_known, acc, note); |
d166c802 CS |
132 | return 0; |
133 | } | |
134 | #else | |
21c7eae2 | 135 | #define smk_bu_note(note, sskp, oskp, mode, RC) (RC) |
d166c802 CS |
136 | #endif |
137 | ||
138 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
21c7eae2 LP |
139 | static int smk_bu_current(char *note, struct smack_known *oskp, |
140 | int mode, int rc) | |
d166c802 CS |
141 | { |
142 | struct task_smack *tsp = current_security(); | |
143 | char acc[SMK_NUM_ACCESS_TYPE + 1]; | |
144 | ||
145 | if (rc <= 0) | |
146 | return rc; | |
bf4b2fee CS |
147 | if (rc > SMACK_UNCONFINED_OBJECT) |
148 | rc = 0; | |
d166c802 CS |
149 | |
150 | smk_bu_mode(mode, acc); | |
bf4b2fee | 151 | pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc], |
21c7eae2 LP |
152 | tsp->smk_task->smk_known, oskp->smk_known, |
153 | acc, current->comm, note); | |
d166c802 CS |
154 | return 0; |
155 | } | |
156 | #else | |
21c7eae2 | 157 | #define smk_bu_current(note, oskp, mode, RC) (RC) |
d166c802 CS |
158 | #endif |
159 | ||
160 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
161 | static int smk_bu_task(struct task_struct *otp, int mode, int rc) | |
162 | { | |
163 | struct task_smack *tsp = current_security(); | |
6d1cff2a | 164 | struct smack_known *smk_task = smk_of_task_struct(otp); |
d166c802 CS |
165 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
166 | ||
167 | if (rc <= 0) | |
168 | return rc; | |
bf4b2fee CS |
169 | if (rc > SMACK_UNCONFINED_OBJECT) |
170 | rc = 0; | |
d166c802 CS |
171 | |
172 | smk_bu_mode(mode, acc); | |
bf4b2fee | 173 | pr_info("Smack %s: (%s %s %s) %s to %s\n", smk_bu_mess[rc], |
6d1cff2a | 174 | tsp->smk_task->smk_known, smk_task->smk_known, acc, |
d166c802 CS |
175 | current->comm, otp->comm); |
176 | return 0; | |
177 | } | |
178 | #else | |
179 | #define smk_bu_task(otp, mode, RC) (RC) | |
180 | #endif | |
181 | ||
182 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
183 | static int smk_bu_inode(struct inode *inode, int mode, int rc) | |
184 | { | |
185 | struct task_smack *tsp = current_security(); | |
bf4b2fee | 186 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
187 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
188 | ||
bf4b2fee CS |
189 | if (isp->smk_flags & SMK_INODE_IMPURE) |
190 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
191 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
192 | ||
d166c802 CS |
193 | if (rc <= 0) |
194 | return rc; | |
bf4b2fee CS |
195 | if (rc > SMACK_UNCONFINED_OBJECT) |
196 | rc = 0; | |
197 | if (rc == SMACK_UNCONFINED_SUBJECT && | |
198 | (mode & (MAY_WRITE | MAY_APPEND))) | |
199 | isp->smk_flags |= SMK_INODE_IMPURE; | |
d166c802 CS |
200 | |
201 | smk_bu_mode(mode, acc); | |
bf4b2fee CS |
202 | |
203 | pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc], | |
204 | tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc, | |
d166c802 CS |
205 | inode->i_sb->s_id, inode->i_ino, current->comm); |
206 | return 0; | |
207 | } | |
208 | #else | |
209 | #define smk_bu_inode(inode, mode, RC) (RC) | |
210 | #endif | |
211 | ||
212 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
213 | static int smk_bu_file(struct file *file, int mode, int rc) | |
214 | { | |
215 | struct task_smack *tsp = current_security(); | |
216 | struct smack_known *sskp = tsp->smk_task; | |
5e7270a6 | 217 | struct inode *inode = file_inode(file); |
bf4b2fee | 218 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
219 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
220 | ||
bf4b2fee CS |
221 | if (isp->smk_flags & SMK_INODE_IMPURE) |
222 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
223 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
224 | ||
d166c802 CS |
225 | if (rc <= 0) |
226 | return rc; | |
bf4b2fee CS |
227 | if (rc > SMACK_UNCONFINED_OBJECT) |
228 | rc = 0; | |
d166c802 CS |
229 | |
230 | smk_bu_mode(mode, acc); | |
bf4b2fee | 231 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
5e7270a6 | 232 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 233 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
234 | current->comm); |
235 | return 0; | |
236 | } | |
237 | #else | |
238 | #define smk_bu_file(file, mode, RC) (RC) | |
239 | #endif | |
240 | ||
241 | #ifdef CONFIG_SECURITY_SMACK_BRINGUP | |
242 | static int smk_bu_credfile(const struct cred *cred, struct file *file, | |
243 | int mode, int rc) | |
244 | { | |
245 | struct task_smack *tsp = cred->security; | |
246 | struct smack_known *sskp = tsp->smk_task; | |
45063097 | 247 | struct inode *inode = file_inode(file); |
bf4b2fee | 248 | struct inode_smack *isp = inode->i_security; |
d166c802 CS |
249 | char acc[SMK_NUM_ACCESS_TYPE + 1]; |
250 | ||
bf4b2fee CS |
251 | if (isp->smk_flags & SMK_INODE_IMPURE) |
252 | pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n", | |
253 | inode->i_sb->s_id, inode->i_ino, current->comm); | |
254 | ||
d166c802 CS |
255 | if (rc <= 0) |
256 | return rc; | |
bf4b2fee CS |
257 | if (rc > SMACK_UNCONFINED_OBJECT) |
258 | rc = 0; | |
d166c802 CS |
259 | |
260 | smk_bu_mode(mode, acc); | |
bf4b2fee | 261 | pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc], |
21c7eae2 | 262 | sskp->smk_known, smk_of_inode(inode)->smk_known, acc, |
a455589f | 263 | inode->i_sb->s_id, inode->i_ino, file, |
d166c802 CS |
264 | current->comm); |
265 | return 0; | |
266 | } | |
267 | #else | |
268 | #define smk_bu_credfile(cred, file, mode, RC) (RC) | |
269 | #endif | |
270 | ||
e114e473 CS |
271 | /** |
272 | * smk_fetch - Fetch the smack label from a file. | |
1a28979b | 273 | * @name: type of the label (attribute) |
e114e473 CS |
274 | * @ip: a pointer to the inode |
275 | * @dp: a pointer to the dentry | |
276 | * | |
e774ad68 LP |
277 | * Returns a pointer to the master list entry for the Smack label, |
278 | * NULL if there was no label to fetch, or an error code. | |
e114e473 | 279 | */ |
2f823ff8 CS |
280 | static struct smack_known *smk_fetch(const char *name, struct inode *ip, |
281 | struct dentry *dp) | |
e114e473 CS |
282 | { |
283 | int rc; | |
f7112e6c | 284 | char *buffer; |
2f823ff8 | 285 | struct smack_known *skp = NULL; |
e114e473 | 286 | |
5d6c3191 | 287 | if (!(ip->i_opflags & IOP_XATTR)) |
e774ad68 | 288 | return ERR_PTR(-EOPNOTSUPP); |
e114e473 | 289 | |
f7112e6c CS |
290 | buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); |
291 | if (buffer == NULL) | |
e774ad68 | 292 | return ERR_PTR(-ENOMEM); |
e114e473 | 293 | |
5d6c3191 | 294 | rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL); |
e774ad68 LP |
295 | if (rc < 0) |
296 | skp = ERR_PTR(rc); | |
297 | else if (rc == 0) | |
298 | skp = NULL; | |
299 | else | |
2f823ff8 | 300 | skp = smk_import_entry(buffer, rc); |
f7112e6c CS |
301 | |
302 | kfree(buffer); | |
303 | ||
2f823ff8 | 304 | return skp; |
e114e473 CS |
305 | } |
306 | ||
307 | /** | |
308 | * new_inode_smack - allocate an inode security blob | |
21c7eae2 | 309 | * @skp: a pointer to the Smack label entry to use in the blob |
e114e473 CS |
310 | * |
311 | * Returns the new blob or NULL if there's no memory available | |
312 | */ | |
1eddfe8e | 313 | static struct inode_smack *new_inode_smack(struct smack_known *skp) |
e114e473 CS |
314 | { |
315 | struct inode_smack *isp; | |
316 | ||
1a5b472b | 317 | isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS); |
e114e473 CS |
318 | if (isp == NULL) |
319 | return NULL; | |
320 | ||
21c7eae2 | 321 | isp->smk_inode = skp; |
e114e473 CS |
322 | isp->smk_flags = 0; |
323 | mutex_init(&isp->smk_lock); | |
324 | ||
325 | return isp; | |
326 | } | |
327 | ||
7898e1f8 CS |
328 | /** |
329 | * new_task_smack - allocate a task security blob | |
1a28979b LP |
330 | * @task: a pointer to the Smack label for the running task |
331 | * @forked: a pointer to the Smack label for the forked task | |
332 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
333 | * |
334 | * Returns the new blob or NULL if there's no memory available | |
335 | */ | |
2f823ff8 CS |
336 | static struct task_smack *new_task_smack(struct smack_known *task, |
337 | struct smack_known *forked, gfp_t gfp) | |
7898e1f8 CS |
338 | { |
339 | struct task_smack *tsp; | |
340 | ||
341 | tsp = kzalloc(sizeof(struct task_smack), gfp); | |
342 | if (tsp == NULL) | |
343 | return NULL; | |
344 | ||
345 | tsp->smk_task = task; | |
346 | tsp->smk_forked = forked; | |
347 | INIT_LIST_HEAD(&tsp->smk_rules); | |
38416e53 | 348 | INIT_LIST_HEAD(&tsp->smk_relabel); |
7898e1f8 CS |
349 | mutex_init(&tsp->smk_rules_lock); |
350 | ||
351 | return tsp; | |
352 | } | |
353 | ||
354 | /** | |
355 | * smk_copy_rules - copy a rule set | |
1a28979b LP |
356 | * @nhead: new rules header pointer |
357 | * @ohead: old rules header pointer | |
358 | * @gfp: type of the memory for the allocation | |
7898e1f8 CS |
359 | * |
360 | * Returns 0 on success, -ENOMEM on error | |
361 | */ | |
362 | static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, | |
363 | gfp_t gfp) | |
364 | { | |
365 | struct smack_rule *nrp; | |
366 | struct smack_rule *orp; | |
367 | int rc = 0; | |
368 | ||
7898e1f8 CS |
369 | list_for_each_entry_rcu(orp, ohead, list) { |
370 | nrp = kzalloc(sizeof(struct smack_rule), gfp); | |
371 | if (nrp == NULL) { | |
372 | rc = -ENOMEM; | |
373 | break; | |
374 | } | |
375 | *nrp = *orp; | |
376 | list_add_rcu(&nrp->list, nhead); | |
377 | } | |
378 | return rc; | |
379 | } | |
380 | ||
38416e53 ZJ |
381 | /** |
382 | * smk_copy_relabel - copy smk_relabel labels list | |
383 | * @nhead: new rules header pointer | |
384 | * @ohead: old rules header pointer | |
385 | * @gfp: type of the memory for the allocation | |
386 | * | |
387 | * Returns 0 on success, -ENOMEM on error | |
388 | */ | |
389 | static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead, | |
390 | gfp_t gfp) | |
391 | { | |
392 | struct smack_known_list_elem *nklep; | |
393 | struct smack_known_list_elem *oklep; | |
394 | ||
38416e53 ZJ |
395 | list_for_each_entry(oklep, ohead, list) { |
396 | nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp); | |
397 | if (nklep == NULL) { | |
398 | smk_destroy_label_list(nhead); | |
399 | return -ENOMEM; | |
400 | } | |
401 | nklep->smk_label = oklep->smk_label; | |
402 | list_add(&nklep->list, nhead); | |
403 | } | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
5663884c LP |
408 | /** |
409 | * smk_ptrace_mode - helper function for converting PTRACE_MODE_* into MAY_* | |
410 | * @mode - input mode in form of PTRACE_MODE_* | |
411 | * | |
412 | * Returns a converted MAY_* mode usable by smack rules | |
413 | */ | |
414 | static inline unsigned int smk_ptrace_mode(unsigned int mode) | |
415 | { | |
3dfb7d8c | 416 | if (mode & PTRACE_MODE_ATTACH) |
5663884c | 417 | return MAY_READWRITE; |
3dfb7d8c JH |
418 | if (mode & PTRACE_MODE_READ) |
419 | return MAY_READ; | |
5663884c LP |
420 | |
421 | return 0; | |
422 | } | |
423 | ||
424 | /** | |
425 | * smk_ptrace_rule_check - helper for ptrace access | |
426 | * @tracer: tracer process | |
21c7eae2 | 427 | * @tracee_known: label entry of the process that's about to be traced |
5663884c LP |
428 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
429 | * @func: name of the function that called us, used for audit | |
430 | * | |
431 | * Returns 0 on access granted, -error on error | |
432 | */ | |
21c7eae2 LP |
433 | static int smk_ptrace_rule_check(struct task_struct *tracer, |
434 | struct smack_known *tracee_known, | |
5663884c LP |
435 | unsigned int mode, const char *func) |
436 | { | |
437 | int rc; | |
438 | struct smk_audit_info ad, *saip = NULL; | |
439 | struct task_smack *tsp; | |
21c7eae2 | 440 | struct smack_known *tracer_known; |
dcb569cf | 441 | const struct cred *tracercred; |
5663884c LP |
442 | |
443 | if ((mode & PTRACE_MODE_NOAUDIT) == 0) { | |
444 | smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK); | |
445 | smk_ad_setfield_u_tsk(&ad, tracer); | |
446 | saip = &ad; | |
447 | } | |
448 | ||
6d1cff2a | 449 | rcu_read_lock(); |
dcb569cf CS |
450 | tracercred = __task_cred(tracer); |
451 | tsp = tracercred->security; | |
21c7eae2 | 452 | tracer_known = smk_of_task(tsp); |
5663884c | 453 | |
66867818 LP |
454 | if ((mode & PTRACE_MODE_ATTACH) && |
455 | (smack_ptrace_rule == SMACK_PTRACE_EXACT || | |
456 | smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) { | |
21c7eae2 | 457 | if (tracer_known->smk_known == tracee_known->smk_known) |
66867818 LP |
458 | rc = 0; |
459 | else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN) | |
460 | rc = -EACCES; | |
dcb569cf | 461 | else if (smack_privileged_cred(CAP_SYS_PTRACE, tracercred)) |
66867818 LP |
462 | rc = 0; |
463 | else | |
464 | rc = -EACCES; | |
465 | ||
466 | if (saip) | |
21c7eae2 LP |
467 | smack_log(tracer_known->smk_known, |
468 | tracee_known->smk_known, | |
469 | 0, rc, saip); | |
66867818 | 470 | |
6d1cff2a | 471 | rcu_read_unlock(); |
66867818 LP |
472 | return rc; |
473 | } | |
474 | ||
475 | /* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */ | |
21c7eae2 | 476 | rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip); |
6d1cff2a AR |
477 | |
478 | rcu_read_unlock(); | |
5663884c LP |
479 | return rc; |
480 | } | |
481 | ||
e114e473 CS |
482 | /* |
483 | * LSM hooks. | |
484 | * We he, that is fun! | |
485 | */ | |
486 | ||
487 | /** | |
9e48858f | 488 | * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH |
e114e473 | 489 | * @ctp: child task pointer |
5663884c | 490 | * @mode: ptrace attachment mode (PTRACE_MODE_*) |
e114e473 CS |
491 | * |
492 | * Returns 0 if access is OK, an error code otherwise | |
493 | * | |
5663884c | 494 | * Do the capability checks. |
e114e473 | 495 | */ |
9e48858f | 496 | static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) |
e114e473 | 497 | { |
2f823ff8 | 498 | struct smack_known *skp; |
e114e473 | 499 | |
6d1cff2a | 500 | skp = smk_of_task_struct(ctp); |
ecfcc53f | 501 | |
b1d9e6b0 | 502 | return smk_ptrace_rule_check(current, skp, mode, __func__); |
5cd9c58f DH |
503 | } |
504 | ||
505 | /** | |
506 | * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME | |
507 | * @ptp: parent task pointer | |
508 | * | |
509 | * Returns 0 if access is OK, an error code otherwise | |
510 | * | |
5663884c | 511 | * Do the capability checks, and require PTRACE_MODE_ATTACH. |
5cd9c58f DH |
512 | */ |
513 | static int smack_ptrace_traceme(struct task_struct *ptp) | |
514 | { | |
515 | int rc; | |
2f823ff8 | 516 | struct smack_known *skp; |
5cd9c58f | 517 | |
959e6c7f | 518 | skp = smk_of_task(current_security()); |
ecfcc53f | 519 | |
21c7eae2 | 520 | rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); |
e114e473 CS |
521 | return rc; |
522 | } | |
523 | ||
524 | /** | |
525 | * smack_syslog - Smack approval on syslog | |
526 | * @type: message type | |
527 | * | |
e114e473 CS |
528 | * Returns 0 on success, error code otherwise. |
529 | */ | |
12b3052c | 530 | static int smack_syslog(int typefrom_file) |
e114e473 | 531 | { |
12b3052c | 532 | int rc = 0; |
2f823ff8 | 533 | struct smack_known *skp = smk_of_current(); |
e114e473 | 534 | |
1880eff7 | 535 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
e114e473 CS |
536 | return 0; |
537 | ||
24ea1b6e | 538 | if (smack_syslog_label != NULL && smack_syslog_label != skp) |
e114e473 CS |
539 | rc = -EACCES; |
540 | ||
541 | return rc; | |
542 | } | |
543 | ||
544 | ||
545 | /* | |
546 | * Superblock Hooks. | |
547 | */ | |
548 | ||
549 | /** | |
550 | * smack_sb_alloc_security - allocate a superblock blob | |
551 | * @sb: the superblock getting the blob | |
552 | * | |
553 | * Returns 0 on success or -ENOMEM on error. | |
554 | */ | |
555 | static int smack_sb_alloc_security(struct super_block *sb) | |
556 | { | |
557 | struct superblock_smack *sbsp; | |
558 | ||
559 | sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); | |
560 | ||
561 | if (sbsp == NULL) | |
562 | return -ENOMEM; | |
563 | ||
21c7eae2 LP |
564 | sbsp->smk_root = &smack_known_floor; |
565 | sbsp->smk_default = &smack_known_floor; | |
566 | sbsp->smk_floor = &smack_known_floor; | |
567 | sbsp->smk_hat = &smack_known_hat; | |
e830b394 | 568 | /* |
9f50eda2 | 569 | * SMK_SB_INITIALIZED will be zero from kzalloc. |
e830b394 | 570 | */ |
e114e473 CS |
571 | sb->s_security = sbsp; |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | /** | |
577 | * smack_sb_free_security - free a superblock blob | |
578 | * @sb: the superblock getting the blob | |
579 | * | |
580 | */ | |
581 | static void smack_sb_free_security(struct super_block *sb) | |
582 | { | |
583 | kfree(sb->s_security); | |
584 | sb->s_security = NULL; | |
585 | } | |
586 | ||
12085b14 AV |
587 | struct smack_mnt_opts { |
588 | const char *fsdefault, *fsfloor, *fshat, *fsroot, *fstransmute; | |
589 | }; | |
590 | ||
204cc0cc AV |
591 | static void smack_free_mnt_opts(void *mnt_opts) |
592 | { | |
12085b14 AV |
593 | struct smack_mnt_opts *opts = mnt_opts; |
594 | kfree(opts->fsdefault); | |
595 | kfree(opts->fsfloor); | |
596 | kfree(opts->fshat); | |
597 | kfree(opts->fsroot); | |
598 | kfree(opts->fstransmute); | |
204cc0cc AV |
599 | kfree(opts); |
600 | } | |
601 | ||
e114e473 CS |
602 | /** |
603 | * smack_sb_copy_data - copy mount options data for processing | |
e114e473 | 604 | * @orig: where to start |
251a2a95 | 605 | * @smackopts: mount options string |
e114e473 CS |
606 | * |
607 | * Returns 0 on success or -ENOMEM on error. | |
608 | * | |
609 | * Copy the Smack specific mount options out of the mount | |
610 | * options list. | |
611 | */ | |
e0007529 | 612 | static int smack_sb_copy_data(char *orig, char *smackopts) |
e114e473 CS |
613 | { |
614 | char *cp, *commap, *otheropts, *dp; | |
615 | ||
e114e473 CS |
616 | otheropts = (char *)get_zeroed_page(GFP_KERNEL); |
617 | if (otheropts == NULL) | |
618 | return -ENOMEM; | |
619 | ||
620 | for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { | |
621 | if (strstr(cp, SMK_FSDEFAULT) == cp) | |
622 | dp = smackopts; | |
623 | else if (strstr(cp, SMK_FSFLOOR) == cp) | |
624 | dp = smackopts; | |
625 | else if (strstr(cp, SMK_FSHAT) == cp) | |
626 | dp = smackopts; | |
627 | else if (strstr(cp, SMK_FSROOT) == cp) | |
628 | dp = smackopts; | |
e830b394 CS |
629 | else if (strstr(cp, SMK_FSTRANS) == cp) |
630 | dp = smackopts; | |
e114e473 CS |
631 | else |
632 | dp = otheropts; | |
633 | ||
634 | commap = strchr(cp, ','); | |
635 | if (commap != NULL) | |
636 | *commap = '\0'; | |
637 | ||
638 | if (*dp != '\0') | |
639 | strcat(dp, ","); | |
640 | strcat(dp, cp); | |
641 | } | |
642 | ||
643 | strcpy(orig, otheropts); | |
644 | free_page((unsigned long)otheropts); | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
55c0e5bd AV |
649 | static int smack_add_opt(int token, const char *s, void **mnt_opts) |
650 | { | |
651 | struct smack_mnt_opts *opts = *mnt_opts; | |
652 | ||
653 | if (!opts) { | |
654 | opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL); | |
655 | if (!opts) | |
656 | return -ENOMEM; | |
657 | *mnt_opts = opts; | |
658 | } | |
659 | ||
660 | if (!s) | |
661 | return -ENOMEM; | |
662 | ||
663 | switch (token) { | |
664 | case Opt_fsdefault: | |
665 | if (opts->fsdefault) | |
666 | goto out_opt_err; | |
667 | opts->fsdefault = s; | |
668 | break; | |
669 | case Opt_fsfloor: | |
670 | if (opts->fsfloor) | |
671 | goto out_opt_err; | |
672 | opts->fsfloor = s; | |
673 | break; | |
674 | case Opt_fshat: | |
675 | if (opts->fshat) | |
676 | goto out_opt_err; | |
677 | opts->fshat = s; | |
678 | break; | |
679 | case Opt_fsroot: | |
680 | if (opts->fsroot) | |
681 | goto out_opt_err; | |
682 | opts->fsroot = s; | |
683 | break; | |
684 | case Opt_fstransmute: | |
685 | if (opts->fstransmute) | |
686 | goto out_opt_err; | |
687 | opts->fstransmute = s; | |
688 | break; | |
689 | } | |
690 | return 0; | |
691 | ||
692 | out_opt_err: | |
693 | pr_warn("Smack: duplicate mount options\n"); | |
694 | return -EINVAL; | |
695 | } | |
696 | ||
e114e473 | 697 | /** |
3bf2789c VT |
698 | * smack_parse_opts_str - parse Smack specific mount options |
699 | * @options: mount options string | |
700 | * @opts: where to store converted mount opts | |
701 | * | |
702 | * Returns 0 on success or -ENOMEM on error. | |
703 | * | |
704 | * converts Smack specific mount options to generic security option format | |
705 | */ | |
706 | static int smack_parse_opts_str(char *options, | |
204cc0cc | 707 | void **mnt_opts) |
3bf2789c | 708 | { |
c3300aaf | 709 | char *from = options; |
3bf2789c | 710 | |
3bf2789c VT |
711 | if (!options) |
712 | return 0; | |
713 | ||
c3300aaf AV |
714 | while (1) { |
715 | char *next = strchr(from, ','); | |
716 | int token, len, rc; | |
717 | char *arg = NULL; | |
3bf2789c | 718 | |
c3300aaf AV |
719 | if (next) |
720 | len = next - from; | |
721 | else | |
722 | len = strlen(from); | |
3bf2789c | 723 | |
c3300aaf AV |
724 | token = match_opt_prefix(from, len, &arg); |
725 | arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL); | |
55c0e5bd AV |
726 | rc = smack_add_opt(token, arg, mnt_opts); |
727 | if (unlikely(rc)) { | |
728 | kfree(arg); | |
729 | if (*mnt_opts) | |
730 | smack_free_mnt_opts(*mnt_opts); | |
731 | *mnt_opts = NULL; | |
732 | return rc; | |
3bf2789c | 733 | } |
c3300aaf AV |
734 | if (!from[len]) |
735 | break; | |
736 | from += len + 1; | |
3bf2789c | 737 | } |
3bf2789c | 738 | return 0; |
3bf2789c VT |
739 | } |
740 | ||
204cc0cc | 741 | static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts) |
5b400239 AV |
742 | { |
743 | char *s = (char *)get_zeroed_page(GFP_KERNEL); | |
744 | int err; | |
745 | ||
746 | if (!s) | |
747 | return -ENOMEM; | |
748 | err = smack_sb_copy_data(options, s); | |
749 | if (!err) | |
204cc0cc | 750 | err = smack_parse_opts_str(s, mnt_opts); |
5b400239 AV |
751 | free_page((unsigned long)s); |
752 | return err; | |
753 | } | |
754 | ||
3bf2789c VT |
755 | /** |
756 | * smack_set_mnt_opts - set Smack specific mount options | |
e114e473 | 757 | * @sb: the file system superblock |
3bf2789c VT |
758 | * @opts: Smack mount options |
759 | * @kern_flags: mount option from kernel space or user space | |
760 | * @set_kern_flags: where to store converted mount opts | |
e114e473 CS |
761 | * |
762 | * Returns 0 on success, an error code on failure | |
3bf2789c VT |
763 | * |
764 | * Allow filesystems with binary mount data to explicitly set Smack mount | |
765 | * labels. | |
e114e473 | 766 | */ |
3bf2789c | 767 | static int smack_set_mnt_opts(struct super_block *sb, |
204cc0cc | 768 | void *mnt_opts, |
3bf2789c VT |
769 | unsigned long kern_flags, |
770 | unsigned long *set_kern_flags) | |
e114e473 CS |
771 | { |
772 | struct dentry *root = sb->s_root; | |
c6f493d6 | 773 | struct inode *inode = d_backing_inode(root); |
e114e473 CS |
774 | struct superblock_smack *sp = sb->s_security; |
775 | struct inode_smack *isp; | |
24ea1b6e | 776 | struct smack_known *skp; |
12085b14 AV |
777 | struct smack_mnt_opts *opts = mnt_opts; |
778 | bool transmute = false; | |
e114e473 | 779 | |
9f50eda2 | 780 | if (sp->smk_flags & SMK_SB_INITIALIZED) |
e114e473 | 781 | return 0; |
eb982cb4 | 782 | |
2097f599 HS |
783 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
784 | /* | |
785 | * Unprivileged mounts don't get to specify Smack values. | |
786 | */ | |
12085b14 | 787 | if (opts) |
2097f599 HS |
788 | return -EPERM; |
789 | /* | |
790 | * Unprivileged mounts get root and default from the caller. | |
791 | */ | |
792 | skp = smk_of_current(); | |
793 | sp->smk_root = skp; | |
794 | sp->smk_default = skp; | |
795 | /* | |
796 | * For a handful of fs types with no user-controlled | |
797 | * backing store it's okay to trust security labels | |
798 | * in the filesystem. The rest are untrusted. | |
799 | */ | |
800 | if (sb->s_user_ns != &init_user_ns && | |
801 | sb->s_magic != SYSFS_MAGIC && sb->s_magic != TMPFS_MAGIC && | |
802 | sb->s_magic != RAMFS_MAGIC) { | |
12085b14 | 803 | transmute = true; |
2097f599 HS |
804 | sp->smk_flags |= SMK_SB_UNTRUSTED; |
805 | } | |
806 | } | |
807 | ||
9f50eda2 | 808 | sp->smk_flags |= SMK_SB_INITIALIZED; |
e114e473 | 809 | |
12085b14 AV |
810 | if (opts) { |
811 | if (opts->fsdefault) { | |
812 | skp = smk_import_entry(opts->fsdefault, 0); | |
e774ad68 LP |
813 | if (IS_ERR(skp)) |
814 | return PTR_ERR(skp); | |
3bf2789c | 815 | sp->smk_default = skp; |
12085b14 AV |
816 | } |
817 | if (opts->fsfloor) { | |
818 | skp = smk_import_entry(opts->fsfloor, 0); | |
e774ad68 LP |
819 | if (IS_ERR(skp)) |
820 | return PTR_ERR(skp); | |
821 | sp->smk_floor = skp; | |
12085b14 AV |
822 | } |
823 | if (opts->fshat) { | |
824 | skp = smk_import_entry(opts->fshat, 0); | |
e774ad68 LP |
825 | if (IS_ERR(skp)) |
826 | return PTR_ERR(skp); | |
3bf2789c | 827 | sp->smk_hat = skp; |
12085b14 AV |
828 | } |
829 | if (opts->fsroot) { | |
830 | skp = smk_import_entry(opts->fsroot, 0); | |
e774ad68 LP |
831 | if (IS_ERR(skp)) |
832 | return PTR_ERR(skp); | |
833 | sp->smk_root = skp; | |
12085b14 AV |
834 | } |
835 | if (opts->fstransmute) { | |
836 | skp = smk_import_entry(opts->fstransmute, 0); | |
e774ad68 LP |
837 | if (IS_ERR(skp)) |
838 | return PTR_ERR(skp); | |
839 | sp->smk_root = skp; | |
12085b14 | 840 | transmute = true; |
e114e473 CS |
841 | } |
842 | } | |
843 | ||
844 | /* | |
845 | * Initialize the root inode. | |
846 | */ | |
847 | isp = inode->i_security; | |
55dfc5da JB |
848 | if (isp == NULL) { |
849 | isp = new_inode_smack(sp->smk_root); | |
850 | if (isp == NULL) | |
851 | return -ENOMEM; | |
852 | inode->i_security = isp; | |
e830b394 | 853 | } else |
e114e473 CS |
854 | isp->smk_inode = sp->smk_root; |
855 | ||
e830b394 CS |
856 | if (transmute) |
857 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
858 | ||
e114e473 CS |
859 | return 0; |
860 | } | |
861 | ||
862 | /** | |
863 | * smack_sb_statfs - Smack check on statfs | |
864 | * @dentry: identifies the file system in question | |
865 | * | |
866 | * Returns 0 if current can read the floor of the filesystem, | |
867 | * and error code otherwise | |
868 | */ | |
869 | static int smack_sb_statfs(struct dentry *dentry) | |
870 | { | |
871 | struct superblock_smack *sbp = dentry->d_sb->s_security; | |
ecfcc53f EB |
872 | int rc; |
873 | struct smk_audit_info ad; | |
874 | ||
a269434d | 875 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 876 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 877 | |
ecfcc53f | 878 | rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); |
d166c802 | 879 | rc = smk_bu_current("statfs", sbp->smk_floor, MAY_READ, rc); |
ecfcc53f | 880 | return rc; |
e114e473 CS |
881 | } |
882 | ||
676dac4b CS |
883 | /* |
884 | * BPRM hooks | |
885 | */ | |
886 | ||
ce8a4321 CS |
887 | /** |
888 | * smack_bprm_set_creds - set creds for exec | |
889 | * @bprm: the exec information | |
890 | * | |
5663884c | 891 | * Returns 0 if it gets a blob, -EPERM if exec forbidden and -ENOMEM otherwise |
ce8a4321 | 892 | */ |
676dac4b CS |
893 | static int smack_bprm_set_creds(struct linux_binprm *bprm) |
894 | { | |
496ad9aa | 895 | struct inode *inode = file_inode(bprm->file); |
84088ba2 | 896 | struct task_smack *bsp = bprm->cred->security; |
676dac4b | 897 | struct inode_smack *isp; |
809c02e0 | 898 | struct superblock_smack *sbsp; |
676dac4b CS |
899 | int rc; |
900 | ||
ddb4a144 | 901 | if (bprm->called_set_creds) |
676dac4b CS |
902 | return 0; |
903 | ||
84088ba2 JS |
904 | isp = inode->i_security; |
905 | if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) | |
676dac4b CS |
906 | return 0; |
907 | ||
809c02e0 SF |
908 | sbsp = inode->i_sb->s_security; |
909 | if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) && | |
910 | isp->smk_task != sbsp->smk_root) | |
911 | return 0; | |
912 | ||
9227dd2a | 913 | if (bprm->unsafe & LSM_UNSAFE_PTRACE) { |
5663884c LP |
914 | struct task_struct *tracer; |
915 | rc = 0; | |
916 | ||
917 | rcu_read_lock(); | |
918 | tracer = ptrace_parent(current); | |
919 | if (likely(tracer != NULL)) | |
920 | rc = smk_ptrace_rule_check(tracer, | |
21c7eae2 | 921 | isp->smk_task, |
5663884c LP |
922 | PTRACE_MODE_ATTACH, |
923 | __func__); | |
924 | rcu_read_unlock(); | |
925 | ||
926 | if (rc != 0) | |
927 | return rc; | |
928 | } else if (bprm->unsafe) | |
84088ba2 | 929 | return -EPERM; |
676dac4b | 930 | |
84088ba2 JS |
931 | bsp->smk_task = isp->smk_task; |
932 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
676dac4b | 933 | |
ccbb6e10 KC |
934 | /* Decide if this is a secure exec. */ |
935 | if (bsp->smk_task != bsp->smk_forked) | |
936 | bprm->secureexec = 1; | |
937 | ||
84088ba2 JS |
938 | return 0; |
939 | } | |
676dac4b | 940 | |
e114e473 CS |
941 | /* |
942 | * Inode hooks | |
943 | */ | |
944 | ||
945 | /** | |
946 | * smack_inode_alloc_security - allocate an inode blob | |
251a2a95 | 947 | * @inode: the inode in need of a blob |
e114e473 CS |
948 | * |
949 | * Returns 0 if it gets a blob, -ENOMEM otherwise | |
950 | */ | |
951 | static int smack_inode_alloc_security(struct inode *inode) | |
952 | { | |
2f823ff8 CS |
953 | struct smack_known *skp = smk_of_current(); |
954 | ||
21c7eae2 | 955 | inode->i_security = new_inode_smack(skp); |
e114e473 CS |
956 | if (inode->i_security == NULL) |
957 | return -ENOMEM; | |
958 | return 0; | |
959 | } | |
960 | ||
961 | /** | |
3d4f673a HS |
962 | * smack_inode_free_rcu - Free inode_smack blob from cache |
963 | * @head: the rcu_head for getting inode_smack pointer | |
964 | * | |
965 | * Call back function called from call_rcu() to free | |
966 | * the i_security blob pointer in inode | |
967 | */ | |
968 | static void smack_inode_free_rcu(struct rcu_head *head) | |
969 | { | |
970 | struct inode_smack *issp; | |
971 | ||
972 | issp = container_of(head, struct inode_smack, smk_rcu); | |
973 | kmem_cache_free(smack_inode_cache, issp); | |
974 | } | |
975 | ||
976 | /** | |
977 | * smack_inode_free_security - free an inode blob using call_rcu() | |
251a2a95 | 978 | * @inode: the inode with a blob |
e114e473 | 979 | * |
3d4f673a | 980 | * Clears the blob pointer in inode using RCU |
e114e473 CS |
981 | */ |
982 | static void smack_inode_free_security(struct inode *inode) | |
983 | { | |
3d4f673a HS |
984 | struct inode_smack *issp = inode->i_security; |
985 | ||
986 | /* | |
987 | * The inode may still be referenced in a path walk and | |
988 | * a call to smack_inode_permission() can be made | |
989 | * after smack_inode_free_security() is called. | |
990 | * To avoid race condition free the i_security via RCU | |
991 | * and leave the current inode->i_security pointer intact. | |
992 | * The inode will be freed after the RCU grace period too. | |
993 | */ | |
994 | call_rcu(&issp->smk_rcu, smack_inode_free_rcu); | |
e114e473 CS |
995 | } |
996 | ||
997 | /** | |
998 | * smack_inode_init_security - copy out the smack from an inode | |
e95ef49b LP |
999 | * @inode: the newly created inode |
1000 | * @dir: containing directory object | |
2a7dba39 | 1001 | * @qstr: unused |
e114e473 CS |
1002 | * @name: where to put the attribute name |
1003 | * @value: where to put the attribute value | |
1004 | * @len: where to put the length of the attribute | |
1005 | * | |
1006 | * Returns 0 if it all works out, -ENOMEM if there's no memory | |
1007 | */ | |
1008 | static int smack_inode_init_security(struct inode *inode, struct inode *dir, | |
9548906b | 1009 | const struct qstr *qstr, const char **name, |
2a7dba39 | 1010 | void **value, size_t *len) |
e114e473 | 1011 | { |
2267b13a | 1012 | struct inode_smack *issp = inode->i_security; |
2f823ff8 | 1013 | struct smack_known *skp = smk_of_current(); |
21c7eae2 LP |
1014 | struct smack_known *isp = smk_of_inode(inode); |
1015 | struct smack_known *dsp = smk_of_inode(dir); | |
7898e1f8 | 1016 | int may; |
e114e473 | 1017 | |
9548906b TH |
1018 | if (name) |
1019 | *name = XATTR_SMACK_SUFFIX; | |
e114e473 | 1020 | |
68390ccf | 1021 | if (value && len) { |
7898e1f8 | 1022 | rcu_read_lock(); |
21c7eae2 LP |
1023 | may = smk_access_entry(skp->smk_known, dsp->smk_known, |
1024 | &skp->smk_rules); | |
7898e1f8 | 1025 | rcu_read_unlock(); |
5c6d1125 JS |
1026 | |
1027 | /* | |
1028 | * If the access rule allows transmutation and | |
1029 | * the directory requests transmutation then | |
1030 | * by all means transmute. | |
2267b13a | 1031 | * Mark the inode as changed. |
5c6d1125 | 1032 | */ |
7898e1f8 | 1033 | if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && |
2267b13a | 1034 | smk_inode_transmutable(dir)) { |
5c6d1125 | 1035 | isp = dsp; |
2267b13a CS |
1036 | issp->smk_flags |= SMK_INODE_CHANGED; |
1037 | } | |
5c6d1125 | 1038 | |
21c7eae2 | 1039 | *value = kstrdup(isp->smk_known, GFP_NOFS); |
e114e473 CS |
1040 | if (*value == NULL) |
1041 | return -ENOMEM; | |
e114e473 | 1042 | |
21c7eae2 | 1043 | *len = strlen(isp->smk_known); |
68390ccf | 1044 | } |
e114e473 CS |
1045 | |
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * smack_inode_link - Smack check on link | |
1051 | * @old_dentry: the existing object | |
1052 | * @dir: unused | |
1053 | * @new_dentry: the new object | |
1054 | * | |
1055 | * Returns 0 if access is permitted, an error code otherwise | |
1056 | */ | |
1057 | static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1058 | struct dentry *new_dentry) | |
1059 | { | |
21c7eae2 | 1060 | struct smack_known *isp; |
ecfcc53f EB |
1061 | struct smk_audit_info ad; |
1062 | int rc; | |
1063 | ||
a269434d | 1064 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1065 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1066 | |
c6f493d6 | 1067 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1068 | rc = smk_curacc(isp, MAY_WRITE, &ad); |
c6f493d6 | 1069 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc); |
e114e473 | 1070 | |
8802565b | 1071 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1072 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1073 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1074 | rc = smk_curacc(isp, MAY_WRITE, &ad); | |
c6f493d6 | 1075 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc); |
e114e473 CS |
1076 | } |
1077 | ||
1078 | return rc; | |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * smack_inode_unlink - Smack check on inode deletion | |
1083 | * @dir: containing directory object | |
1084 | * @dentry: file to unlink | |
1085 | * | |
1086 | * Returns 0 if current can write the containing directory | |
1087 | * and the object, error code otherwise | |
1088 | */ | |
1089 | static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1090 | { | |
c6f493d6 | 1091 | struct inode *ip = d_backing_inode(dentry); |
ecfcc53f | 1092 | struct smk_audit_info ad; |
e114e473 CS |
1093 | int rc; |
1094 | ||
a269434d | 1095 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1096 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1097 | ||
e114e473 CS |
1098 | /* |
1099 | * You need write access to the thing you're unlinking | |
1100 | */ | |
ecfcc53f | 1101 | rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); |
d166c802 | 1102 | rc = smk_bu_inode(ip, MAY_WRITE, rc); |
ecfcc53f | 1103 | if (rc == 0) { |
e114e473 CS |
1104 | /* |
1105 | * You also need write access to the containing directory | |
1106 | */ | |
cdb56b60 | 1107 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1108 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1109 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1110 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1111 | } |
e114e473 CS |
1112 | return rc; |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * smack_inode_rmdir - Smack check on directory deletion | |
1117 | * @dir: containing directory object | |
1118 | * @dentry: directory to unlink | |
1119 | * | |
1120 | * Returns 0 if current can write the containing directory | |
1121 | * and the directory, error code otherwise | |
1122 | */ | |
1123 | static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1124 | { | |
ecfcc53f | 1125 | struct smk_audit_info ad; |
e114e473 CS |
1126 | int rc; |
1127 | ||
a269434d | 1128 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1129 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1130 | ||
e114e473 CS |
1131 | /* |
1132 | * You need write access to the thing you're removing | |
1133 | */ | |
c6f493d6 DH |
1134 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1135 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
ecfcc53f | 1136 | if (rc == 0) { |
e114e473 CS |
1137 | /* |
1138 | * You also need write access to the containing directory | |
1139 | */ | |
cdb56b60 | 1140 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f EB |
1141 | smk_ad_setfield_u_fs_inode(&ad, dir); |
1142 | rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); | |
d166c802 | 1143 | rc = smk_bu_inode(dir, MAY_WRITE, rc); |
ecfcc53f | 1144 | } |
e114e473 CS |
1145 | |
1146 | return rc; | |
1147 | } | |
1148 | ||
1149 | /** | |
1150 | * smack_inode_rename - Smack check on rename | |
e95ef49b LP |
1151 | * @old_inode: unused |
1152 | * @old_dentry: the old object | |
1153 | * @new_inode: unused | |
1154 | * @new_dentry: the new object | |
e114e473 CS |
1155 | * |
1156 | * Read and write access is required on both the old and | |
1157 | * new directories. | |
1158 | * | |
1159 | * Returns 0 if access is permitted, an error code otherwise | |
1160 | */ | |
1161 | static int smack_inode_rename(struct inode *old_inode, | |
1162 | struct dentry *old_dentry, | |
1163 | struct inode *new_inode, | |
1164 | struct dentry *new_dentry) | |
1165 | { | |
1166 | int rc; | |
21c7eae2 | 1167 | struct smack_known *isp; |
ecfcc53f EB |
1168 | struct smk_audit_info ad; |
1169 | ||
a269434d | 1170 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1171 | smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); |
e114e473 | 1172 | |
c6f493d6 | 1173 | isp = smk_of_inode(d_backing_inode(old_dentry)); |
ecfcc53f | 1174 | rc = smk_curacc(isp, MAY_READWRITE, &ad); |
c6f493d6 | 1175 | rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc); |
e114e473 | 1176 | |
8802565b | 1177 | if (rc == 0 && d_is_positive(new_dentry)) { |
c6f493d6 | 1178 | isp = smk_of_inode(d_backing_inode(new_dentry)); |
ecfcc53f EB |
1179 | smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); |
1180 | rc = smk_curacc(isp, MAY_READWRITE, &ad); | |
c6f493d6 | 1181 | rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc); |
e114e473 | 1182 | } |
e114e473 CS |
1183 | return rc; |
1184 | } | |
1185 | ||
1186 | /** | |
1187 | * smack_inode_permission - Smack version of permission() | |
1188 | * @inode: the inode in question | |
1189 | * @mask: the access requested | |
e114e473 CS |
1190 | * |
1191 | * This is the important Smack hook. | |
1192 | * | |
1193 | * Returns 0 if access is permitted, -EACCES otherwise | |
1194 | */ | |
e74f71eb | 1195 | static int smack_inode_permission(struct inode *inode, int mask) |
e114e473 | 1196 | { |
9f50eda2 | 1197 | struct superblock_smack *sbsp = inode->i_sb->s_security; |
ecfcc53f | 1198 | struct smk_audit_info ad; |
e74f71eb | 1199 | int no_block = mask & MAY_NOT_BLOCK; |
d166c802 | 1200 | int rc; |
d09ca739 EP |
1201 | |
1202 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
e114e473 CS |
1203 | /* |
1204 | * No permission to check. Existence test. Yup, it's there. | |
1205 | */ | |
1206 | if (mask == 0) | |
1207 | return 0; | |
8c9e80ed | 1208 | |
9f50eda2 SF |
1209 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED) { |
1210 | if (smk_of_inode(inode) != sbsp->smk_root) | |
1211 | return -EACCES; | |
1212 | } | |
1213 | ||
8c9e80ed | 1214 | /* May be droppable after audit */ |
e74f71eb | 1215 | if (no_block) |
8c9e80ed | 1216 | return -ECHILD; |
f48b7399 | 1217 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); |
ecfcc53f | 1218 | smk_ad_setfield_u_fs_inode(&ad, inode); |
d166c802 CS |
1219 | rc = smk_curacc(smk_of_inode(inode), mask, &ad); |
1220 | rc = smk_bu_inode(inode, mask, rc); | |
1221 | return rc; | |
e114e473 CS |
1222 | } |
1223 | ||
1224 | /** | |
1225 | * smack_inode_setattr - Smack check for setting attributes | |
1226 | * @dentry: the object | |
1227 | * @iattr: for the force flag | |
1228 | * | |
1229 | * Returns 0 if access is permitted, an error code otherwise | |
1230 | */ | |
1231 | static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
1232 | { | |
ecfcc53f | 1233 | struct smk_audit_info ad; |
d166c802 CS |
1234 | int rc; |
1235 | ||
e114e473 CS |
1236 | /* |
1237 | * Need to allow for clearing the setuid bit. | |
1238 | */ | |
1239 | if (iattr->ia_valid & ATTR_FORCE) | |
1240 | return 0; | |
a269434d | 1241 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1242 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
e114e473 | 1243 | |
c6f493d6 DH |
1244 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1245 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1246 | return rc; |
e114e473 CS |
1247 | } |
1248 | ||
1249 | /** | |
1250 | * smack_inode_getattr - Smack check for getting attributes | |
e95ef49b | 1251 | * @mnt: vfsmount of the object |
e114e473 CS |
1252 | * @dentry: the object |
1253 | * | |
1254 | * Returns 0 if access is permitted, an error code otherwise | |
1255 | */ | |
3f7036a0 | 1256 | static int smack_inode_getattr(const struct path *path) |
e114e473 | 1257 | { |
ecfcc53f | 1258 | struct smk_audit_info ad; |
c6f493d6 | 1259 | struct inode *inode = d_backing_inode(path->dentry); |
d166c802 | 1260 | int rc; |
ecfcc53f | 1261 | |
f48b7399 | 1262 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
3f7036a0 AV |
1263 | smk_ad_setfield_u_fs_path(&ad, *path); |
1264 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); | |
1265 | rc = smk_bu_inode(inode, MAY_READ, rc); | |
d166c802 | 1266 | return rc; |
e114e473 CS |
1267 | } |
1268 | ||
1269 | /** | |
1270 | * smack_inode_setxattr - Smack check for setting xattrs | |
1271 | * @dentry: the object | |
1272 | * @name: name of the attribute | |
e95ef49b LP |
1273 | * @value: value of the attribute |
1274 | * @size: size of the value | |
e114e473 CS |
1275 | * @flags: unused |
1276 | * | |
1277 | * This protects the Smack attribute explicitly. | |
1278 | * | |
1279 | * Returns 0 if access is permitted, an error code otherwise | |
1280 | */ | |
8f0cfa52 DH |
1281 | static int smack_inode_setxattr(struct dentry *dentry, const char *name, |
1282 | const void *value, size_t size, int flags) | |
e114e473 | 1283 | { |
ecfcc53f | 1284 | struct smk_audit_info ad; |
19760ad0 CS |
1285 | struct smack_known *skp; |
1286 | int check_priv = 0; | |
1287 | int check_import = 0; | |
1288 | int check_star = 0; | |
bcdca225 | 1289 | int rc = 0; |
e114e473 | 1290 | |
19760ad0 CS |
1291 | /* |
1292 | * Check label validity here so import won't fail in post_setxattr | |
1293 | */ | |
bcdca225 CS |
1294 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1295 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
19760ad0 CS |
1296 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { |
1297 | check_priv = 1; | |
1298 | check_import = 1; | |
1299 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || | |
1300 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { | |
1301 | check_priv = 1; | |
1302 | check_import = 1; | |
1303 | check_star = 1; | |
5c6d1125 | 1304 | } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
19760ad0 | 1305 | check_priv = 1; |
5c6d1125 JS |
1306 | if (size != TRANS_TRUE_SIZE || |
1307 | strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) | |
1308 | rc = -EINVAL; | |
bcdca225 CS |
1309 | } else |
1310 | rc = cap_inode_setxattr(dentry, name, value, size, flags); | |
1311 | ||
19760ad0 CS |
1312 | if (check_priv && !smack_privileged(CAP_MAC_ADMIN)) |
1313 | rc = -EPERM; | |
1314 | ||
1315 | if (rc == 0 && check_import) { | |
b862e561 | 1316 | skp = size ? smk_import_entry(value, size) : NULL; |
e774ad68 LP |
1317 | if (IS_ERR(skp)) |
1318 | rc = PTR_ERR(skp); | |
1319 | else if (skp == NULL || (check_star && | |
19760ad0 CS |
1320 | (skp == &smack_known_star || skp == &smack_known_web))) |
1321 | rc = -EINVAL; | |
1322 | } | |
1323 | ||
a269434d | 1324 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1325 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1326 | ||
d166c802 | 1327 | if (rc == 0) { |
c6f493d6 DH |
1328 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1329 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
d166c802 | 1330 | } |
bcdca225 CS |
1331 | |
1332 | return rc; | |
e114e473 CS |
1333 | } |
1334 | ||
1335 | /** | |
1336 | * smack_inode_post_setxattr - Apply the Smack update approved above | |
1337 | * @dentry: object | |
1338 | * @name: attribute name | |
1339 | * @value: attribute value | |
1340 | * @size: attribute size | |
1341 | * @flags: unused | |
1342 | * | |
1343 | * Set the pointer in the inode blob to the entry found | |
1344 | * in the master label list. | |
1345 | */ | |
8f0cfa52 DH |
1346 | static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, |
1347 | const void *value, size_t size, int flags) | |
e114e473 | 1348 | { |
2f823ff8 | 1349 | struct smack_known *skp; |
c6f493d6 | 1350 | struct inode_smack *isp = d_backing_inode(dentry)->i_security; |
676dac4b | 1351 | |
2f823ff8 CS |
1352 | if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { |
1353 | isp->smk_flags |= SMK_INODE_TRANSMUTE; | |
1354 | return; | |
1355 | } | |
1356 | ||
676dac4b | 1357 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
9598f4c9 | 1358 | skp = smk_import_entry(value, size); |
e774ad68 | 1359 | if (!IS_ERR(skp)) |
21c7eae2 | 1360 | isp->smk_inode = skp; |
5c6d1125 | 1361 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { |
9598f4c9 | 1362 | skp = smk_import_entry(value, size); |
e774ad68 | 1363 | if (!IS_ERR(skp)) |
2f823ff8 | 1364 | isp->smk_task = skp; |
7898e1f8 | 1365 | } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
9598f4c9 | 1366 | skp = smk_import_entry(value, size); |
e774ad68 | 1367 | if (!IS_ERR(skp)) |
2f823ff8 | 1368 | isp->smk_mmap = skp; |
2f823ff8 | 1369 | } |
e114e473 CS |
1370 | |
1371 | return; | |
1372 | } | |
1373 | ||
ce8a4321 | 1374 | /** |
e114e473 CS |
1375 | * smack_inode_getxattr - Smack check on getxattr |
1376 | * @dentry: the object | |
1377 | * @name: unused | |
1378 | * | |
1379 | * Returns 0 if access is permitted, an error code otherwise | |
1380 | */ | |
8f0cfa52 | 1381 | static int smack_inode_getxattr(struct dentry *dentry, const char *name) |
e114e473 | 1382 | { |
ecfcc53f | 1383 | struct smk_audit_info ad; |
d166c802 | 1384 | int rc; |
ecfcc53f | 1385 | |
a269434d | 1386 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f EB |
1387 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
1388 | ||
c6f493d6 DH |
1389 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); |
1390 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); | |
d166c802 | 1391 | return rc; |
e114e473 CS |
1392 | } |
1393 | ||
ce8a4321 | 1394 | /** |
e114e473 CS |
1395 | * smack_inode_removexattr - Smack check on removexattr |
1396 | * @dentry: the object | |
1397 | * @name: name of the attribute | |
1398 | * | |
1399 | * Removing the Smack attribute requires CAP_MAC_ADMIN | |
1400 | * | |
1401 | * Returns 0 if access is permitted, an error code otherwise | |
1402 | */ | |
8f0cfa52 | 1403 | static int smack_inode_removexattr(struct dentry *dentry, const char *name) |
e114e473 | 1404 | { |
676dac4b | 1405 | struct inode_smack *isp; |
ecfcc53f | 1406 | struct smk_audit_info ad; |
bcdca225 | 1407 | int rc = 0; |
e114e473 | 1408 | |
bcdca225 CS |
1409 | if (strcmp(name, XATTR_NAME_SMACK) == 0 || |
1410 | strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || | |
676dac4b | 1411 | strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || |
5c6d1125 | 1412 | strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || |
7898e1f8 | 1413 | strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || |
5e9ab593 | 1414 | strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { |
1880eff7 | 1415 | if (!smack_privileged(CAP_MAC_ADMIN)) |
bcdca225 CS |
1416 | rc = -EPERM; |
1417 | } else | |
1418 | rc = cap_inode_removexattr(dentry, name); | |
1419 | ||
f59bdfba CS |
1420 | if (rc != 0) |
1421 | return rc; | |
1422 | ||
a269434d | 1423 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); |
ecfcc53f | 1424 | smk_ad_setfield_u_fs_path_dentry(&ad, dentry); |
bcdca225 | 1425 | |
c6f493d6 DH |
1426 | rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); |
1427 | rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); | |
f59bdfba CS |
1428 | if (rc != 0) |
1429 | return rc; | |
1430 | ||
c6f493d6 | 1431 | isp = d_backing_inode(dentry)->i_security; |
f59bdfba CS |
1432 | /* |
1433 | * Don't do anything special for these. | |
1434 | * XATTR_NAME_SMACKIPIN | |
1435 | * XATTR_NAME_SMACKIPOUT | |
f59bdfba | 1436 | */ |
8012495e | 1437 | if (strcmp(name, XATTR_NAME_SMACK) == 0) { |
fc64005c | 1438 | struct super_block *sbp = dentry->d_sb; |
8012495e JB |
1439 | struct superblock_smack *sbsp = sbp->s_security; |
1440 | ||
1441 | isp->smk_inode = sbsp->smk_default; | |
1442 | } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) | |
676dac4b | 1443 | isp->smk_task = NULL; |
f59bdfba | 1444 | else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) |
7898e1f8 | 1445 | isp->smk_mmap = NULL; |
f59bdfba CS |
1446 | else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) |
1447 | isp->smk_flags &= ~SMK_INODE_TRANSMUTE; | |
676dac4b | 1448 | |
f59bdfba | 1449 | return 0; |
e114e473 CS |
1450 | } |
1451 | ||
1452 | /** | |
1453 | * smack_inode_getsecurity - get smack xattrs | |
1454 | * @inode: the object | |
1455 | * @name: attribute name | |
1456 | * @buffer: where to put the result | |
57e7ba04 | 1457 | * @alloc: duplicate memory |
e114e473 CS |
1458 | * |
1459 | * Returns the size of the attribute or an error code | |
1460 | */ | |
ea861dfd | 1461 | static int smack_inode_getsecurity(struct inode *inode, |
e114e473 CS |
1462 | const char *name, void **buffer, |
1463 | bool alloc) | |
1464 | { | |
1465 | struct socket_smack *ssp; | |
1466 | struct socket *sock; | |
1467 | struct super_block *sbp; | |
1468 | struct inode *ip = (struct inode *)inode; | |
21c7eae2 | 1469 | struct smack_known *isp; |
e114e473 | 1470 | |
57e7ba04 | 1471 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) |
e114e473 | 1472 | isp = smk_of_inode(inode); |
57e7ba04 CS |
1473 | else { |
1474 | /* | |
1475 | * The rest of the Smack xattrs are only on sockets. | |
1476 | */ | |
1477 | sbp = ip->i_sb; | |
1478 | if (sbp->s_magic != SOCKFS_MAGIC) | |
1479 | return -EOPNOTSUPP; | |
e114e473 | 1480 | |
57e7ba04 CS |
1481 | sock = SOCKET_I(ip); |
1482 | if (sock == NULL || sock->sk == NULL) | |
1483 | return -EOPNOTSUPP; | |
e114e473 | 1484 | |
57e7ba04 | 1485 | ssp = sock->sk->sk_security; |
e114e473 | 1486 | |
57e7ba04 CS |
1487 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) |
1488 | isp = ssp->smk_in; | |
1489 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) | |
1490 | isp = ssp->smk_out; | |
1491 | else | |
1492 | return -EOPNOTSUPP; | |
1493 | } | |
e114e473 | 1494 | |
57e7ba04 CS |
1495 | if (alloc) { |
1496 | *buffer = kstrdup(isp->smk_known, GFP_KERNEL); | |
1497 | if (*buffer == NULL) | |
1498 | return -ENOMEM; | |
e114e473 CS |
1499 | } |
1500 | ||
57e7ba04 | 1501 | return strlen(isp->smk_known); |
e114e473 CS |
1502 | } |
1503 | ||
1504 | ||
1505 | /** | |
1506 | * smack_inode_listsecurity - list the Smack attributes | |
1507 | * @inode: the object | |
1508 | * @buffer: where they go | |
1509 | * @buffer_size: size of buffer | |
e114e473 CS |
1510 | */ |
1511 | static int smack_inode_listsecurity(struct inode *inode, char *buffer, | |
1512 | size_t buffer_size) | |
1513 | { | |
fd5c9d23 | 1514 | int len = sizeof(XATTR_NAME_SMACK); |
e114e473 | 1515 | |
fd5c9d23 | 1516 | if (buffer != NULL && len <= buffer_size) |
e114e473 | 1517 | memcpy(buffer, XATTR_NAME_SMACK, len); |
fd5c9d23 KK |
1518 | |
1519 | return len; | |
e114e473 CS |
1520 | } |
1521 | ||
d20bdda6 AD |
1522 | /** |
1523 | * smack_inode_getsecid - Extract inode's security id | |
1524 | * @inode: inode to extract the info from | |
1525 | * @secid: where result will be saved | |
1526 | */ | |
d6335d77 | 1527 | static void smack_inode_getsecid(struct inode *inode, u32 *secid) |
d20bdda6 | 1528 | { |
0f8983cf | 1529 | struct smack_known *skp = smk_of_inode(inode); |
d20bdda6 | 1530 | |
0f8983cf | 1531 | *secid = skp->smk_secid; |
d20bdda6 AD |
1532 | } |
1533 | ||
e114e473 CS |
1534 | /* |
1535 | * File Hooks | |
1536 | */ | |
1537 | ||
491a0b08 CS |
1538 | /* |
1539 | * There is no smack_file_permission hook | |
e114e473 CS |
1540 | * |
1541 | * Should access checks be done on each read or write? | |
1542 | * UNICOS and SELinux say yes. | |
1543 | * Trusted Solaris, Trusted Irix, and just about everyone else says no. | |
1544 | * | |
1545 | * I'll say no for now. Smack does not do the frequent | |
1546 | * label changing that SELinux does. | |
1547 | */ | |
e114e473 CS |
1548 | |
1549 | /** | |
1550 | * smack_file_alloc_security - assign a file security blob | |
1551 | * @file: the object | |
1552 | * | |
1553 | * The security blob for a file is a pointer to the master | |
1554 | * label list, so no allocation is done. | |
1555 | * | |
5e7270a6 CS |
1556 | * f_security is the owner security information. It |
1557 | * isn't used on file access checks, it's for send_sigio. | |
1558 | * | |
e114e473 CS |
1559 | * Returns 0 |
1560 | */ | |
1561 | static int smack_file_alloc_security(struct file *file) | |
1562 | { | |
2f823ff8 CS |
1563 | struct smack_known *skp = smk_of_current(); |
1564 | ||
21c7eae2 | 1565 | file->f_security = skp; |
e114e473 CS |
1566 | return 0; |
1567 | } | |
1568 | ||
1569 | /** | |
1570 | * smack_file_free_security - clear a file security blob | |
1571 | * @file: the object | |
1572 | * | |
1573 | * The security blob for a file is a pointer to the master | |
1574 | * label list, so no memory is freed. | |
1575 | */ | |
1576 | static void smack_file_free_security(struct file *file) | |
1577 | { | |
1578 | file->f_security = NULL; | |
1579 | } | |
1580 | ||
1581 | /** | |
1582 | * smack_file_ioctl - Smack check on ioctls | |
1583 | * @file: the object | |
1584 | * @cmd: what to do | |
1585 | * @arg: unused | |
1586 | * | |
1587 | * Relies heavily on the correct use of the ioctl command conventions. | |
1588 | * | |
1589 | * Returns 0 if allowed, error code otherwise | |
1590 | */ | |
1591 | static int smack_file_ioctl(struct file *file, unsigned int cmd, | |
1592 | unsigned long arg) | |
1593 | { | |
1594 | int rc = 0; | |
ecfcc53f | 1595 | struct smk_audit_info ad; |
5e7270a6 | 1596 | struct inode *inode = file_inode(file); |
ecfcc53f | 1597 | |
83a1e53f SWK |
1598 | if (unlikely(IS_PRIVATE(inode))) |
1599 | return 0; | |
1600 | ||
f48b7399 | 1601 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1602 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
e114e473 | 1603 | |
d166c802 | 1604 | if (_IOC_DIR(cmd) & _IOC_WRITE) { |
5e7270a6 | 1605 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 CS |
1606 | rc = smk_bu_file(file, MAY_WRITE, rc); |
1607 | } | |
e114e473 | 1608 | |
d166c802 | 1609 | if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) { |
5e7270a6 | 1610 | rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad); |
d166c802 CS |
1611 | rc = smk_bu_file(file, MAY_READ, rc); |
1612 | } | |
e114e473 CS |
1613 | |
1614 | return rc; | |
1615 | } | |
1616 | ||
1617 | /** | |
1618 | * smack_file_lock - Smack check on file locking | |
1619 | * @file: the object | |
251a2a95 | 1620 | * @cmd: unused |
e114e473 | 1621 | * |
c0ab6e56 | 1622 | * Returns 0 if current has lock access, error code otherwise |
e114e473 CS |
1623 | */ |
1624 | static int smack_file_lock(struct file *file, unsigned int cmd) | |
1625 | { | |
ecfcc53f | 1626 | struct smk_audit_info ad; |
d166c802 | 1627 | int rc; |
5e7270a6 | 1628 | struct inode *inode = file_inode(file); |
ecfcc53f | 1629 | |
83a1e53f SWK |
1630 | if (unlikely(IS_PRIVATE(inode))) |
1631 | return 0; | |
1632 | ||
92f42509 EP |
1633 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1634 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1635 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 CS |
1636 | rc = smk_bu_file(file, MAY_LOCK, rc); |
1637 | return rc; | |
e114e473 CS |
1638 | } |
1639 | ||
1640 | /** | |
1641 | * smack_file_fcntl - Smack check on fcntl | |
1642 | * @file: the object | |
1643 | * @cmd: what action to check | |
1644 | * @arg: unused | |
1645 | * | |
531f1d45 CS |
1646 | * Generally these operations are harmless. |
1647 | * File locking operations present an obvious mechanism | |
1648 | * for passing information, so they require write access. | |
1649 | * | |
e114e473 CS |
1650 | * Returns 0 if current has access, error code otherwise |
1651 | */ | |
1652 | static int smack_file_fcntl(struct file *file, unsigned int cmd, | |
1653 | unsigned long arg) | |
1654 | { | |
ecfcc53f | 1655 | struct smk_audit_info ad; |
531f1d45 | 1656 | int rc = 0; |
5e7270a6 | 1657 | struct inode *inode = file_inode(file); |
ecfcc53f | 1658 | |
83a1e53f SWK |
1659 | if (unlikely(IS_PRIVATE(inode))) |
1660 | return 0; | |
1661 | ||
e114e473 | 1662 | switch (cmd) { |
e114e473 | 1663 | case F_GETLK: |
c0ab6e56 | 1664 | break; |
e114e473 CS |
1665 | case F_SETLK: |
1666 | case F_SETLKW: | |
c0ab6e56 CS |
1667 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1668 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1669 | rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); |
d166c802 | 1670 | rc = smk_bu_file(file, MAY_LOCK, rc); |
c0ab6e56 | 1671 | break; |
e114e473 CS |
1672 | case F_SETOWN: |
1673 | case F_SETSIG: | |
531f1d45 CS |
1674 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1675 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
5e7270a6 | 1676 | rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad); |
d166c802 | 1677 | rc = smk_bu_file(file, MAY_WRITE, rc); |
e114e473 CS |
1678 | break; |
1679 | default: | |
531f1d45 | 1680 | break; |
e114e473 CS |
1681 | } |
1682 | ||
1683 | return rc; | |
1684 | } | |
1685 | ||
7898e1f8 | 1686 | /** |
e5467859 | 1687 | * smack_mmap_file : |
7898e1f8 CS |
1688 | * Check permissions for a mmap operation. The @file may be NULL, e.g. |
1689 | * if mapping anonymous memory. | |
1690 | * @file contains the file structure for file to map (may be NULL). | |
1691 | * @reqprot contains the protection requested by the application. | |
1692 | * @prot contains the protection that will be applied by the kernel. | |
1693 | * @flags contains the operational flags. | |
1694 | * Return 0 if permission is granted. | |
1695 | */ | |
e5467859 | 1696 | static int smack_mmap_file(struct file *file, |
7898e1f8 | 1697 | unsigned long reqprot, unsigned long prot, |
e5467859 | 1698 | unsigned long flags) |
7898e1f8 | 1699 | { |
272cd7a8 | 1700 | struct smack_known *skp; |
2f823ff8 | 1701 | struct smack_known *mkp; |
7898e1f8 CS |
1702 | struct smack_rule *srp; |
1703 | struct task_smack *tsp; | |
21c7eae2 | 1704 | struct smack_known *okp; |
7898e1f8 | 1705 | struct inode_smack *isp; |
809c02e0 | 1706 | struct superblock_smack *sbsp; |
0e0a070d CS |
1707 | int may; |
1708 | int mmay; | |
1709 | int tmay; | |
7898e1f8 CS |
1710 | int rc; |
1711 | ||
496ad9aa | 1712 | if (file == NULL) |
7898e1f8 CS |
1713 | return 0; |
1714 | ||
83a1e53f SWK |
1715 | if (unlikely(IS_PRIVATE(file_inode(file)))) |
1716 | return 0; | |
1717 | ||
496ad9aa | 1718 | isp = file_inode(file)->i_security; |
7898e1f8 CS |
1719 | if (isp->smk_mmap == NULL) |
1720 | return 0; | |
809c02e0 SF |
1721 | sbsp = file_inode(file)->i_sb->s_security; |
1722 | if (sbsp->smk_flags & SMK_SB_UNTRUSTED && | |
1723 | isp->smk_mmap != sbsp->smk_root) | |
1724 | return -EACCES; | |
2f823ff8 | 1725 | mkp = isp->smk_mmap; |
7898e1f8 CS |
1726 | |
1727 | tsp = current_security(); | |
2f823ff8 | 1728 | skp = smk_of_current(); |
7898e1f8 CS |
1729 | rc = 0; |
1730 | ||
1731 | rcu_read_lock(); | |
1732 | /* | |
1733 | * For each Smack rule associated with the subject | |
1734 | * label verify that the SMACK64MMAP also has access | |
1735 | * to that rule's object label. | |
7898e1f8 | 1736 | */ |
272cd7a8 | 1737 | list_for_each_entry_rcu(srp, &skp->smk_rules, list) { |
21c7eae2 | 1738 | okp = srp->smk_object; |
7898e1f8 CS |
1739 | /* |
1740 | * Matching labels always allows access. | |
1741 | */ | |
21c7eae2 | 1742 | if (mkp->smk_known == okp->smk_known) |
7898e1f8 | 1743 | continue; |
0e0a070d CS |
1744 | /* |
1745 | * If there is a matching local rule take | |
1746 | * that into account as well. | |
1747 | */ | |
21c7eae2 LP |
1748 | may = smk_access_entry(srp->smk_subject->smk_known, |
1749 | okp->smk_known, | |
1750 | &tsp->smk_rules); | |
0e0a070d CS |
1751 | if (may == -ENOENT) |
1752 | may = srp->smk_access; | |
1753 | else | |
1754 | may &= srp->smk_access; | |
1755 | /* | |
1756 | * If may is zero the SMACK64MMAP subject can't | |
1757 | * possibly have less access. | |
1758 | */ | |
1759 | if (may == 0) | |
1760 | continue; | |
1761 | ||
1762 | /* | |
1763 | * Fetch the global list entry. | |
1764 | * If there isn't one a SMACK64MMAP subject | |
1765 | * can't have as much access as current. | |
1766 | */ | |
21c7eae2 LP |
1767 | mmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1768 | &mkp->smk_rules); | |
0e0a070d CS |
1769 | if (mmay == -ENOENT) { |
1770 | rc = -EACCES; | |
1771 | break; | |
1772 | } | |
1773 | /* | |
1774 | * If there is a local entry it modifies the | |
1775 | * potential access, too. | |
1776 | */ | |
21c7eae2 LP |
1777 | tmay = smk_access_entry(mkp->smk_known, okp->smk_known, |
1778 | &tsp->smk_rules); | |
0e0a070d CS |
1779 | if (tmay != -ENOENT) |
1780 | mmay &= tmay; | |
7898e1f8 | 1781 | |
0e0a070d CS |
1782 | /* |
1783 | * If there is any access available to current that is | |
1784 | * not available to a SMACK64MMAP subject | |
1785 | * deny access. | |
1786 | */ | |
75a25637 | 1787 | if ((may | mmay) != mmay) { |
0e0a070d | 1788 | rc = -EACCES; |
7898e1f8 | 1789 | break; |
0e0a070d | 1790 | } |
7898e1f8 CS |
1791 | } |
1792 | ||
1793 | rcu_read_unlock(); | |
1794 | ||
1795 | return rc; | |
1796 | } | |
1797 | ||
e114e473 CS |
1798 | /** |
1799 | * smack_file_set_fowner - set the file security blob value | |
1800 | * @file: object in question | |
1801 | * | |
e114e473 | 1802 | */ |
e0b93edd | 1803 | static void smack_file_set_fowner(struct file *file) |
e114e473 | 1804 | { |
5e7270a6 | 1805 | file->f_security = smk_of_current(); |
e114e473 CS |
1806 | } |
1807 | ||
1808 | /** | |
1809 | * smack_file_send_sigiotask - Smack on sigio | |
1810 | * @tsk: The target task | |
1811 | * @fown: the object the signal come from | |
1812 | * @signum: unused | |
1813 | * | |
1814 | * Allow a privileged task to get signals even if it shouldn't | |
1815 | * | |
1816 | * Returns 0 if a subject with the object's smack could | |
1817 | * write to the task, an error code otherwise. | |
1818 | */ | |
1819 | static int smack_file_send_sigiotask(struct task_struct *tsk, | |
1820 | struct fown_struct *fown, int signum) | |
1821 | { | |
2f823ff8 CS |
1822 | struct smack_known *skp; |
1823 | struct smack_known *tkp = smk_of_task(tsk->cred->security); | |
dcb569cf | 1824 | const struct cred *tcred; |
e114e473 CS |
1825 | struct file *file; |
1826 | int rc; | |
ecfcc53f | 1827 | struct smk_audit_info ad; |
e114e473 CS |
1828 | |
1829 | /* | |
1830 | * struct fown_struct is never outside the context of a struct file | |
1831 | */ | |
1832 | file = container_of(fown, struct file, f_owner); | |
7898e1f8 | 1833 | |
ecfcc53f | 1834 | /* we don't log here as rc can be overriden */ |
21c7eae2 | 1835 | skp = file->f_security; |
c60b9066 CS |
1836 | rc = smk_access(skp, tkp, MAY_DELIVER, NULL); |
1837 | rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc); | |
dcb569cf CS |
1838 | |
1839 | rcu_read_lock(); | |
1840 | tcred = __task_cred(tsk); | |
1841 | if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred)) | |
ecfcc53f | 1842 | rc = 0; |
dcb569cf | 1843 | rcu_read_unlock(); |
ecfcc53f EB |
1844 | |
1845 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); | |
1846 | smk_ad_setfield_u_tsk(&ad, tsk); | |
c60b9066 | 1847 | smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad); |
e114e473 CS |
1848 | return rc; |
1849 | } | |
1850 | ||
1851 | /** | |
1852 | * smack_file_receive - Smack file receive check | |
1853 | * @file: the object | |
1854 | * | |
1855 | * Returns 0 if current has access, error code otherwise | |
1856 | */ | |
1857 | static int smack_file_receive(struct file *file) | |
1858 | { | |
d166c802 | 1859 | int rc; |
e114e473 | 1860 | int may = 0; |
ecfcc53f | 1861 | struct smk_audit_info ad; |
5e7270a6 | 1862 | struct inode *inode = file_inode(file); |
79be0935 CS |
1863 | struct socket *sock; |
1864 | struct task_smack *tsp; | |
1865 | struct socket_smack *ssp; | |
e114e473 | 1866 | |
9777582e SWK |
1867 | if (unlikely(IS_PRIVATE(inode))) |
1868 | return 0; | |
1869 | ||
4482a44f | 1870 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
ecfcc53f | 1871 | smk_ad_setfield_u_fs_path(&ad, file->f_path); |
79be0935 | 1872 | |
51d59af2 | 1873 | if (inode->i_sb->s_magic == SOCKFS_MAGIC) { |
79be0935 CS |
1874 | sock = SOCKET_I(inode); |
1875 | ssp = sock->sk->sk_security; | |
1876 | tsp = current_security(); | |
1877 | /* | |
1878 | * If the receiving process can't write to the | |
1879 | * passed socket or if the passed socket can't | |
1880 | * write to the receiving process don't accept | |
1881 | * the passed socket. | |
1882 | */ | |
1883 | rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad); | |
1884 | rc = smk_bu_file(file, may, rc); | |
1885 | if (rc < 0) | |
1886 | return rc; | |
1887 | rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad); | |
1888 | rc = smk_bu_file(file, may, rc); | |
1889 | return rc; | |
1890 | } | |
e114e473 CS |
1891 | /* |
1892 | * This code relies on bitmasks. | |
1893 | */ | |
1894 | if (file->f_mode & FMODE_READ) | |
1895 | may = MAY_READ; | |
1896 | if (file->f_mode & FMODE_WRITE) | |
1897 | may |= MAY_WRITE; | |
1898 | ||
5e7270a6 | 1899 | rc = smk_curacc(smk_of_inode(inode), may, &ad); |
d166c802 CS |
1900 | rc = smk_bu_file(file, may, rc); |
1901 | return rc; | |
e114e473 CS |
1902 | } |
1903 | ||
531f1d45 | 1904 | /** |
83d49856 | 1905 | * smack_file_open - Smack dentry open processing |
531f1d45 | 1906 | * @file: the object |
a6834c0b | 1907 | * @cred: task credential |
531f1d45 CS |
1908 | * |
1909 | * Set the security blob in the file structure. | |
a6834c0b CS |
1910 | * Allow the open only if the task has read access. There are |
1911 | * many read operations (e.g. fstat) that you can do with an | |
1912 | * fd even if you have the file open write-only. | |
531f1d45 CS |
1913 | * |
1914 | * Returns 0 | |
1915 | */ | |
94817692 | 1916 | static int smack_file_open(struct file *file) |
531f1d45 | 1917 | { |
94817692 | 1918 | struct task_smack *tsp = file->f_cred->security; |
5e7270a6 | 1919 | struct inode *inode = file_inode(file); |
a6834c0b CS |
1920 | struct smk_audit_info ad; |
1921 | int rc; | |
531f1d45 | 1922 | |
a6834c0b CS |
1923 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); |
1924 | smk_ad_setfield_u_fs_path(&ad, file->f_path); | |
c9d238a1 | 1925 | rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad); |
94817692 | 1926 | rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc); |
a6834c0b CS |
1927 | |
1928 | return rc; | |
531f1d45 CS |
1929 | } |
1930 | ||
e114e473 CS |
1931 | /* |
1932 | * Task hooks | |
1933 | */ | |
1934 | ||
ee18d64c DH |
1935 | /** |
1936 | * smack_cred_alloc_blank - "allocate" blank task-level security credentials | |
1937 | * @new: the new credentials | |
1938 | * @gfp: the atomicity of any memory allocations | |
1939 | * | |
1940 | * Prepare a blank set of credentials for modification. This must allocate all | |
1941 | * the memory the LSM module might require such that cred_transfer() can | |
1942 | * complete without error. | |
1943 | */ | |
1944 | static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
1945 | { | |
7898e1f8 CS |
1946 | struct task_smack *tsp; |
1947 | ||
1948 | tsp = new_task_smack(NULL, NULL, gfp); | |
1949 | if (tsp == NULL) | |
676dac4b | 1950 | return -ENOMEM; |
7898e1f8 CS |
1951 | |
1952 | cred->security = tsp; | |
1953 | ||
ee18d64c DH |
1954 | return 0; |
1955 | } | |
1956 | ||
1957 | ||
e114e473 | 1958 | /** |
f1752eec DH |
1959 | * smack_cred_free - "free" task-level security credentials |
1960 | * @cred: the credentials in question | |
e114e473 | 1961 | * |
e114e473 | 1962 | */ |
f1752eec | 1963 | static void smack_cred_free(struct cred *cred) |
e114e473 | 1964 | { |
7898e1f8 CS |
1965 | struct task_smack *tsp = cred->security; |
1966 | struct smack_rule *rp; | |
1967 | struct list_head *l; | |
1968 | struct list_head *n; | |
1969 | ||
1970 | if (tsp == NULL) | |
1971 | return; | |
1972 | cred->security = NULL; | |
1973 | ||
38416e53 ZJ |
1974 | smk_destroy_label_list(&tsp->smk_relabel); |
1975 | ||
7898e1f8 CS |
1976 | list_for_each_safe(l, n, &tsp->smk_rules) { |
1977 | rp = list_entry(l, struct smack_rule, list); | |
1978 | list_del(&rp->list); | |
1979 | kfree(rp); | |
1980 | } | |
1981 | kfree(tsp); | |
e114e473 CS |
1982 | } |
1983 | ||
d84f4f99 DH |
1984 | /** |
1985 | * smack_cred_prepare - prepare new set of credentials for modification | |
1986 | * @new: the new credentials | |
1987 | * @old: the original credentials | |
1988 | * @gfp: the atomicity of any memory allocations | |
1989 | * | |
1990 | * Prepare a new set of credentials for modification. | |
1991 | */ | |
1992 | static int smack_cred_prepare(struct cred *new, const struct cred *old, | |
1993 | gfp_t gfp) | |
1994 | { | |
676dac4b CS |
1995 | struct task_smack *old_tsp = old->security; |
1996 | struct task_smack *new_tsp; | |
7898e1f8 | 1997 | int rc; |
676dac4b | 1998 | |
7898e1f8 | 1999 | new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); |
676dac4b CS |
2000 | if (new_tsp == NULL) |
2001 | return -ENOMEM; | |
2002 | ||
b437aba8 HS |
2003 | new->security = new_tsp; |
2004 | ||
7898e1f8 CS |
2005 | rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); |
2006 | if (rc != 0) | |
2007 | return rc; | |
2008 | ||
38416e53 ZJ |
2009 | rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel, |
2010 | gfp); | |
2011 | if (rc != 0) | |
2012 | return rc; | |
2013 | ||
d84f4f99 DH |
2014 | return 0; |
2015 | } | |
2016 | ||
ee18d64c DH |
2017 | /** |
2018 | * smack_cred_transfer - Transfer the old credentials to the new credentials | |
2019 | * @new: the new credentials | |
2020 | * @old: the original credentials | |
2021 | * | |
2022 | * Fill in a set of blank credentials from another set of credentials. | |
2023 | */ | |
2024 | static void smack_cred_transfer(struct cred *new, const struct cred *old) | |
2025 | { | |
676dac4b CS |
2026 | struct task_smack *old_tsp = old->security; |
2027 | struct task_smack *new_tsp = new->security; | |
2028 | ||
2029 | new_tsp->smk_task = old_tsp->smk_task; | |
2030 | new_tsp->smk_forked = old_tsp->smk_task; | |
7898e1f8 CS |
2031 | mutex_init(&new_tsp->smk_rules_lock); |
2032 | INIT_LIST_HEAD(&new_tsp->smk_rules); | |
2033 | ||
2034 | ||
2035 | /* cbs copy rule list */ | |
ee18d64c DH |
2036 | } |
2037 | ||
3ec30113 MG |
2038 | /** |
2039 | * smack_cred_getsecid - get the secid corresponding to a creds structure | |
2040 | * @c: the object creds | |
2041 | * @secid: where to put the result | |
2042 | * | |
2043 | * Sets the secid to contain a u32 version of the smack label. | |
2044 | */ | |
2045 | static void smack_cred_getsecid(const struct cred *c, u32 *secid) | |
2046 | { | |
2047 | struct smack_known *skp; | |
2048 | ||
2049 | rcu_read_lock(); | |
2050 | skp = smk_of_task(c->security); | |
2051 | *secid = skp->smk_secid; | |
2052 | rcu_read_unlock(); | |
2053 | } | |
2054 | ||
3a3b7ce9 DH |
2055 | /** |
2056 | * smack_kernel_act_as - Set the subjective context in a set of credentials | |
251a2a95 RD |
2057 | * @new: points to the set of credentials to be modified. |
2058 | * @secid: specifies the security ID to be set | |
3a3b7ce9 DH |
2059 | * |
2060 | * Set the security data for a kernel service. | |
2061 | */ | |
2062 | static int smack_kernel_act_as(struct cred *new, u32 secid) | |
2063 | { | |
676dac4b | 2064 | struct task_smack *new_tsp = new->security; |
3a3b7ce9 | 2065 | |
152f91d4 | 2066 | new_tsp->smk_task = smack_from_secid(secid); |
3a3b7ce9 DH |
2067 | return 0; |
2068 | } | |
2069 | ||
2070 | /** | |
2071 | * smack_kernel_create_files_as - Set the file creation label in a set of creds | |
251a2a95 RD |
2072 | * @new: points to the set of credentials to be modified |
2073 | * @inode: points to the inode to use as a reference | |
3a3b7ce9 DH |
2074 | * |
2075 | * Set the file creation context in a set of credentials to the same | |
2076 | * as the objective context of the specified inode | |
2077 | */ | |
2078 | static int smack_kernel_create_files_as(struct cred *new, | |
2079 | struct inode *inode) | |
2080 | { | |
2081 | struct inode_smack *isp = inode->i_security; | |
676dac4b | 2082 | struct task_smack *tsp = new->security; |
3a3b7ce9 | 2083 | |
21c7eae2 | 2084 | tsp->smk_forked = isp->smk_inode; |
2f823ff8 | 2085 | tsp->smk_task = tsp->smk_forked; |
3a3b7ce9 DH |
2086 | return 0; |
2087 | } | |
2088 | ||
ecfcc53f EB |
2089 | /** |
2090 | * smk_curacc_on_task - helper to log task related access | |
2091 | * @p: the task object | |
531f1d45 CS |
2092 | * @access: the access requested |
2093 | * @caller: name of the calling function for audit | |
ecfcc53f EB |
2094 | * |
2095 | * Return 0 if access is permitted | |
2096 | */ | |
531f1d45 CS |
2097 | static int smk_curacc_on_task(struct task_struct *p, int access, |
2098 | const char *caller) | |
ecfcc53f EB |
2099 | { |
2100 | struct smk_audit_info ad; | |
6d1cff2a | 2101 | struct smack_known *skp = smk_of_task_struct(p); |
d166c802 | 2102 | int rc; |
ecfcc53f | 2103 | |
531f1d45 | 2104 | smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); |
ecfcc53f | 2105 | smk_ad_setfield_u_tsk(&ad, p); |
21c7eae2 | 2106 | rc = smk_curacc(skp, access, &ad); |
d166c802 CS |
2107 | rc = smk_bu_task(p, access, rc); |
2108 | return rc; | |
ecfcc53f EB |
2109 | } |
2110 | ||
e114e473 CS |
2111 | /** |
2112 | * smack_task_setpgid - Smack check on setting pgid | |
2113 | * @p: the task object | |
2114 | * @pgid: unused | |
2115 | * | |
2116 | * Return 0 if write access is permitted | |
2117 | */ | |
2118 | static int smack_task_setpgid(struct task_struct *p, pid_t pgid) | |
2119 | { | |
531f1d45 | 2120 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2121 | } |
2122 | ||
2123 | /** | |
2124 | * smack_task_getpgid - Smack access check for getpgid | |
2125 | * @p: the object task | |
2126 | * | |
2127 | * Returns 0 if current can read the object task, error code otherwise | |
2128 | */ | |
2129 | static int smack_task_getpgid(struct task_struct *p) | |
2130 | { | |
531f1d45 | 2131 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2132 | } |
2133 | ||
2134 | /** | |
2135 | * smack_task_getsid - Smack access check for getsid | |
2136 | * @p: the object task | |
2137 | * | |
2138 | * Returns 0 if current can read the object task, error code otherwise | |
2139 | */ | |
2140 | static int smack_task_getsid(struct task_struct *p) | |
2141 | { | |
531f1d45 | 2142 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2143 | } |
2144 | ||
2145 | /** | |
2146 | * smack_task_getsecid - get the secid of the task | |
2147 | * @p: the object task | |
2148 | * @secid: where to put the result | |
2149 | * | |
2150 | * Sets the secid to contain a u32 version of the smack label. | |
2151 | */ | |
2152 | static void smack_task_getsecid(struct task_struct *p, u32 *secid) | |
2153 | { | |
6d1cff2a | 2154 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 CS |
2155 | |
2156 | *secid = skp->smk_secid; | |
e114e473 CS |
2157 | } |
2158 | ||
2159 | /** | |
2160 | * smack_task_setnice - Smack check on setting nice | |
2161 | * @p: the task object | |
2162 | * @nice: unused | |
2163 | * | |
2164 | * Return 0 if write access is permitted | |
2165 | */ | |
2166 | static int smack_task_setnice(struct task_struct *p, int nice) | |
2167 | { | |
b1d9e6b0 | 2168 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2169 | } |
2170 | ||
2171 | /** | |
2172 | * smack_task_setioprio - Smack check on setting ioprio | |
2173 | * @p: the task object | |
2174 | * @ioprio: unused | |
2175 | * | |
2176 | * Return 0 if write access is permitted | |
2177 | */ | |
2178 | static int smack_task_setioprio(struct task_struct *p, int ioprio) | |
2179 | { | |
b1d9e6b0 | 2180 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2181 | } |
2182 | ||
2183 | /** | |
2184 | * smack_task_getioprio - Smack check on reading ioprio | |
2185 | * @p: the task object | |
2186 | * | |
2187 | * Return 0 if read access is permitted | |
2188 | */ | |
2189 | static int smack_task_getioprio(struct task_struct *p) | |
2190 | { | |
531f1d45 | 2191 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2192 | } |
2193 | ||
2194 | /** | |
2195 | * smack_task_setscheduler - Smack check on setting scheduler | |
2196 | * @p: the task object | |
2197 | * @policy: unused | |
2198 | * @lp: unused | |
2199 | * | |
2200 | * Return 0 if read access is permitted | |
2201 | */ | |
b0ae1981 | 2202 | static int smack_task_setscheduler(struct task_struct *p) |
e114e473 | 2203 | { |
b1d9e6b0 | 2204 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2205 | } |
2206 | ||
2207 | /** | |
2208 | * smack_task_getscheduler - Smack check on reading scheduler | |
2209 | * @p: the task object | |
2210 | * | |
2211 | * Return 0 if read access is permitted | |
2212 | */ | |
2213 | static int smack_task_getscheduler(struct task_struct *p) | |
2214 | { | |
531f1d45 | 2215 | return smk_curacc_on_task(p, MAY_READ, __func__); |
e114e473 CS |
2216 | } |
2217 | ||
2218 | /** | |
2219 | * smack_task_movememory - Smack check on moving memory | |
2220 | * @p: the task object | |
2221 | * | |
2222 | * Return 0 if write access is permitted | |
2223 | */ | |
2224 | static int smack_task_movememory(struct task_struct *p) | |
2225 | { | |
531f1d45 | 2226 | return smk_curacc_on_task(p, MAY_WRITE, __func__); |
e114e473 CS |
2227 | } |
2228 | ||
2229 | /** | |
2230 | * smack_task_kill - Smack check on signal delivery | |
2231 | * @p: the task object | |
2232 | * @info: unused | |
2233 | * @sig: unused | |
6b4f3d01 | 2234 | * @cred: identifies the cred to use in lieu of current's |
e114e473 CS |
2235 | * |
2236 | * Return 0 if write access is permitted | |
2237 | * | |
e114e473 | 2238 | */ |
ae7795bc | 2239 | static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info, |
6b4f3d01 | 2240 | int sig, const struct cred *cred) |
e114e473 | 2241 | { |
ecfcc53f | 2242 | struct smk_audit_info ad; |
2f823ff8 | 2243 | struct smack_known *skp; |
6d1cff2a | 2244 | struct smack_known *tkp = smk_of_task_struct(p); |
d166c802 | 2245 | int rc; |
ecfcc53f | 2246 | |
18d872f7 RK |
2247 | if (!sig) |
2248 | return 0; /* null signal; existence test */ | |
2249 | ||
ecfcc53f EB |
2250 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); |
2251 | smk_ad_setfield_u_tsk(&ad, p); | |
e114e473 CS |
2252 | /* |
2253 | * Sending a signal requires that the sender | |
2254 | * can write the receiver. | |
2255 | */ | |
6b4f3d01 | 2256 | if (cred == NULL) { |
c60b9066 CS |
2257 | rc = smk_curacc(tkp, MAY_DELIVER, &ad); |
2258 | rc = smk_bu_task(p, MAY_DELIVER, rc); | |
d166c802 CS |
2259 | return rc; |
2260 | } | |
e114e473 | 2261 | /* |
6b4f3d01 | 2262 | * If the cred isn't NULL we're dealing with some USB IO |
e114e473 CS |
2263 | * specific behavior. This is not clean. For one thing |
2264 | * we can't take privilege into account. | |
2265 | */ | |
6b4f3d01 | 2266 | skp = smk_of_task(cred->security); |
c60b9066 CS |
2267 | rc = smk_access(skp, tkp, MAY_DELIVER, &ad); |
2268 | rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc); | |
d166c802 | 2269 | return rc; |
e114e473 CS |
2270 | } |
2271 | ||
e114e473 CS |
2272 | /** |
2273 | * smack_task_to_inode - copy task smack into the inode blob | |
2274 | * @p: task to copy from | |
251a2a95 | 2275 | * @inode: inode to copy to |
e114e473 CS |
2276 | * |
2277 | * Sets the smack pointer in the inode security blob | |
2278 | */ | |
2279 | static void smack_task_to_inode(struct task_struct *p, struct inode *inode) | |
2280 | { | |
2281 | struct inode_smack *isp = inode->i_security; | |
6d1cff2a | 2282 | struct smack_known *skp = smk_of_task_struct(p); |
2f823ff8 | 2283 | |
21c7eae2 | 2284 | isp->smk_inode = skp; |
7b4e8843 | 2285 | isp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2286 | } |
2287 | ||
2288 | /* | |
2289 | * Socket hooks. | |
2290 | */ | |
2291 | ||
2292 | /** | |
2293 | * smack_sk_alloc_security - Allocate a socket blob | |
2294 | * @sk: the socket | |
2295 | * @family: unused | |
251a2a95 | 2296 | * @gfp_flags: memory allocation flags |
e114e473 CS |
2297 | * |
2298 | * Assign Smack pointers to current | |
2299 | * | |
2300 | * Returns 0 on success, -ENOMEM is there's no memory | |
2301 | */ | |
2302 | static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) | |
2303 | { | |
2f823ff8 | 2304 | struct smack_known *skp = smk_of_current(); |
e114e473 CS |
2305 | struct socket_smack *ssp; |
2306 | ||
2307 | ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); | |
2308 | if (ssp == NULL) | |
2309 | return -ENOMEM; | |
2310 | ||
08382c9f | 2311 | /* |
2312 | * Sockets created by kernel threads receive web label. | |
2313 | */ | |
2314 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2315 | ssp->smk_in = &smack_known_web; | |
2316 | ssp->smk_out = &smack_known_web; | |
2317 | } else { | |
2318 | ssp->smk_in = skp; | |
2319 | ssp->smk_out = skp; | |
2320 | } | |
272cd7a8 | 2321 | ssp->smk_packet = NULL; |
e114e473 CS |
2322 | |
2323 | sk->sk_security = ssp; | |
2324 | ||
2325 | return 0; | |
2326 | } | |
2327 | ||
2328 | /** | |
2329 | * smack_sk_free_security - Free a socket blob | |
2330 | * @sk: the socket | |
2331 | * | |
2332 | * Clears the blob pointer | |
2333 | */ | |
2334 | static void smack_sk_free_security(struct sock *sk) | |
2335 | { | |
0c96d1f5 VG |
2336 | #ifdef SMACK_IPV6_PORT_LABELING |
2337 | struct smk_port_label *spp; | |
2338 | ||
2339 | if (sk->sk_family == PF_INET6) { | |
2340 | rcu_read_lock(); | |
2341 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
2342 | if (spp->smk_sock != sk) | |
2343 | continue; | |
2344 | spp->smk_can_reuse = 1; | |
2345 | break; | |
2346 | } | |
2347 | rcu_read_unlock(); | |
2348 | } | |
2349 | #endif | |
e114e473 CS |
2350 | kfree(sk->sk_security); |
2351 | } | |
2352 | ||
07feee8f | 2353 | /** |
21abb1ec | 2354 | * smack_ipv4host_label - check host based restrictions |
07feee8f PM |
2355 | * @sip: the object end |
2356 | * | |
2357 | * looks for host based access restrictions | |
2358 | * | |
2359 | * This version will only be appropriate for really small sets of single label | |
2360 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2361 | * taken before calling this function. | |
2362 | * | |
2363 | * Returns the label of the far end or NULL if it's not special. | |
2364 | */ | |
21abb1ec | 2365 | static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip) |
07feee8f | 2366 | { |
21abb1ec | 2367 | struct smk_net4addr *snp; |
07feee8f PM |
2368 | struct in_addr *siap = &sip->sin_addr; |
2369 | ||
2370 | if (siap->s_addr == 0) | |
2371 | return NULL; | |
2372 | ||
21abb1ec CS |
2373 | list_for_each_entry_rcu(snp, &smk_net4addr_list, list) |
2374 | /* | |
2375 | * we break after finding the first match because | |
2376 | * the list is sorted from longest to shortest mask | |
2377 | * so we have found the most specific match | |
2378 | */ | |
2379 | if (snp->smk_host.s_addr == | |
2380 | (siap->s_addr & snp->smk_mask.s_addr)) | |
2381 | return snp->smk_label; | |
2382 | ||
2383 | return NULL; | |
2384 | } | |
2385 | ||
2386 | #if IS_ENABLED(CONFIG_IPV6) | |
2387 | /* | |
2388 | * smk_ipv6_localhost - Check for local ipv6 host address | |
2389 | * @sip: the address | |
2390 | * | |
2391 | * Returns boolean true if this is the localhost address | |
2392 | */ | |
2393 | static bool smk_ipv6_localhost(struct sockaddr_in6 *sip) | |
2394 | { | |
2395 | __be16 *be16p = (__be16 *)&sip->sin6_addr; | |
2396 | __be32 *be32p = (__be32 *)&sip->sin6_addr; | |
2397 | ||
2398 | if (be32p[0] == 0 && be32p[1] == 0 && be32p[2] == 0 && be16p[6] == 0 && | |
2399 | ntohs(be16p[7]) == 1) | |
2400 | return true; | |
2401 | return false; | |
2402 | } | |
2403 | ||
2404 | /** | |
2405 | * smack_ipv6host_label - check host based restrictions | |
2406 | * @sip: the object end | |
2407 | * | |
2408 | * looks for host based access restrictions | |
2409 | * | |
2410 | * This version will only be appropriate for really small sets of single label | |
2411 | * hosts. The caller is responsible for ensuring that the RCU read lock is | |
2412 | * taken before calling this function. | |
2413 | * | |
2414 | * Returns the label of the far end or NULL if it's not special. | |
2415 | */ | |
2416 | static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip) | |
2417 | { | |
2418 | struct smk_net6addr *snp; | |
2419 | struct in6_addr *sap = &sip->sin6_addr; | |
2420 | int i; | |
2421 | int found = 0; | |
2422 | ||
2423 | /* | |
2424 | * It's local. Don't look for a host label. | |
2425 | */ | |
2426 | if (smk_ipv6_localhost(sip)) | |
2427 | return NULL; | |
2428 | ||
2429 | list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { | |
2e4939f7 CS |
2430 | /* |
2431 | * If the label is NULL the entry has | |
2432 | * been renounced. Ignore it. | |
2433 | */ | |
2434 | if (snp->smk_label == NULL) | |
2435 | continue; | |
07feee8f PM |
2436 | /* |
2437 | * we break after finding the first match because | |
2438 | * the list is sorted from longest to shortest mask | |
2439 | * so we have found the most specific match | |
2440 | */ | |
21abb1ec | 2441 | for (found = 1, i = 0; i < 8; i++) { |
21abb1ec CS |
2442 | if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) != |
2443 | snp->smk_host.s6_addr16[i]) { | |
2444 | found = 0; | |
2445 | break; | |
2446 | } | |
4303154e | 2447 | } |
21abb1ec CS |
2448 | if (found) |
2449 | return snp->smk_label; | |
2450 | } | |
07feee8f PM |
2451 | |
2452 | return NULL; | |
2453 | } | |
21abb1ec | 2454 | #endif /* CONFIG_IPV6 */ |
07feee8f | 2455 | |
e114e473 CS |
2456 | /** |
2457 | * smack_netlabel - Set the secattr on a socket | |
2458 | * @sk: the socket | |
6d3dc07c | 2459 | * @labeled: socket label scheme |
e114e473 CS |
2460 | * |
2461 | * Convert the outbound smack value (smk_out) to a | |
2462 | * secattr and attach it to the socket. | |
2463 | * | |
2464 | * Returns 0 on success or an error code | |
2465 | */ | |
6d3dc07c | 2466 | static int smack_netlabel(struct sock *sk, int labeled) |
e114e473 | 2467 | { |
f7112e6c | 2468 | struct smack_known *skp; |
07feee8f | 2469 | struct socket_smack *ssp = sk->sk_security; |
6d3dc07c | 2470 | int rc = 0; |
e114e473 | 2471 | |
6d3dc07c CS |
2472 | /* |
2473 | * Usually the netlabel code will handle changing the | |
2474 | * packet labeling based on the label. | |
2475 | * The case of a single label host is different, because | |
2476 | * a single label host should never get a labeled packet | |
2477 | * even though the label is usually associated with a packet | |
2478 | * label. | |
2479 | */ | |
2480 | local_bh_disable(); | |
2481 | bh_lock_sock_nested(sk); | |
2482 | ||
2483 | if (ssp->smk_out == smack_net_ambient || | |
2484 | labeled == SMACK_UNLABELED_SOCKET) | |
2485 | netlbl_sock_delattr(sk); | |
2486 | else { | |
2f823ff8 | 2487 | skp = ssp->smk_out; |
f7112e6c | 2488 | rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); |
6d3dc07c CS |
2489 | } |
2490 | ||
2491 | bh_unlock_sock(sk); | |
2492 | local_bh_enable(); | |
4bc87e62 | 2493 | |
e114e473 CS |
2494 | return rc; |
2495 | } | |
2496 | ||
07feee8f PM |
2497 | /** |
2498 | * smack_netlbel_send - Set the secattr on a socket and perform access checks | |
2499 | * @sk: the socket | |
2500 | * @sap: the destination address | |
2501 | * | |
2502 | * Set the correct secattr for the given socket based on the destination | |
2503 | * address and perform any outbound access checks needed. | |
2504 | * | |
2505 | * Returns 0 on success or an error code. | |
2506 | * | |
2507 | */ | |
2508 | static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) | |
2509 | { | |
2f823ff8 | 2510 | struct smack_known *skp; |
07feee8f PM |
2511 | int rc; |
2512 | int sk_lbl; | |
21c7eae2 | 2513 | struct smack_known *hkp; |
07feee8f | 2514 | struct socket_smack *ssp = sk->sk_security; |
ecfcc53f | 2515 | struct smk_audit_info ad; |
07feee8f PM |
2516 | |
2517 | rcu_read_lock(); | |
21abb1ec | 2518 | hkp = smack_ipv4host_label(sap); |
21c7eae2 | 2519 | if (hkp != NULL) { |
ecfcc53f | 2520 | #ifdef CONFIG_AUDIT |
923e9a13 KC |
2521 | struct lsm_network_audit net; |
2522 | ||
48c62af6 EP |
2523 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
2524 | ad.a.u.net->family = sap->sin_family; | |
2525 | ad.a.u.net->dport = sap->sin_port; | |
2526 | ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; | |
ecfcc53f | 2527 | #endif |
923e9a13 | 2528 | sk_lbl = SMACK_UNLABELED_SOCKET; |
2f823ff8 | 2529 | skp = ssp->smk_out; |
21c7eae2 LP |
2530 | rc = smk_access(skp, hkp, MAY_WRITE, &ad); |
2531 | rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc); | |
07feee8f PM |
2532 | } else { |
2533 | sk_lbl = SMACK_CIPSO_SOCKET; | |
2534 | rc = 0; | |
2535 | } | |
2536 | rcu_read_unlock(); | |
2537 | if (rc != 0) | |
2538 | return rc; | |
2539 | ||
2540 | return smack_netlabel(sk, sk_lbl); | |
2541 | } | |
2542 | ||
21abb1ec CS |
2543 | #if IS_ENABLED(CONFIG_IPV6) |
2544 | /** | |
2545 | * smk_ipv6_check - check Smack access | |
2546 | * @subject: subject Smack label | |
2547 | * @object: object Smack label | |
2548 | * @address: address | |
2549 | * @act: the action being taken | |
2550 | * | |
2551 | * Check an IPv6 access | |
2552 | */ | |
2553 | static int smk_ipv6_check(struct smack_known *subject, | |
2554 | struct smack_known *object, | |
2555 | struct sockaddr_in6 *address, int act) | |
2556 | { | |
2557 | #ifdef CONFIG_AUDIT | |
2558 | struct lsm_network_audit net; | |
2559 | #endif | |
2560 | struct smk_audit_info ad; | |
2561 | int rc; | |
2562 | ||
2563 | #ifdef CONFIG_AUDIT | |
2564 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
2565 | ad.a.u.net->family = PF_INET6; | |
2566 | ad.a.u.net->dport = ntohs(address->sin6_port); | |
2567 | if (act == SMK_RECEIVING) | |
2568 | ad.a.u.net->v6info.saddr = address->sin6_addr; | |
2569 | else | |
2570 | ad.a.u.net->v6info.daddr = address->sin6_addr; | |
2571 | #endif | |
2572 | rc = smk_access(subject, object, MAY_WRITE, &ad); | |
2573 | rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc); | |
2574 | return rc; | |
2575 | } | |
2576 | #endif /* CONFIG_IPV6 */ | |
2577 | ||
2578 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 CS |
2579 | /** |
2580 | * smk_ipv6_port_label - Smack port access table management | |
2581 | * @sock: socket | |
2582 | * @address: address | |
2583 | * | |
2584 | * Create or update the port list entry | |
2585 | */ | |
2586 | static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) | |
2587 | { | |
2588 | struct sock *sk = sock->sk; | |
2589 | struct sockaddr_in6 *addr6; | |
2590 | struct socket_smack *ssp = sock->sk->sk_security; | |
2591 | struct smk_port_label *spp; | |
2592 | unsigned short port = 0; | |
2593 | ||
2594 | if (address == NULL) { | |
2595 | /* | |
2596 | * This operation is changing the Smack information | |
2597 | * on the bound socket. Take the changes to the port | |
2598 | * as well. | |
2599 | */ | |
3c7ce342 VG |
2600 | rcu_read_lock(); |
2601 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
c6739443 CS |
2602 | if (sk != spp->smk_sock) |
2603 | continue; | |
2604 | spp->smk_in = ssp->smk_in; | |
2605 | spp->smk_out = ssp->smk_out; | |
3c7ce342 | 2606 | rcu_read_unlock(); |
c6739443 CS |
2607 | return; |
2608 | } | |
2609 | /* | |
2610 | * A NULL address is only used for updating existing | |
2611 | * bound entries. If there isn't one, it's OK. | |
2612 | */ | |
3c7ce342 | 2613 | rcu_read_unlock(); |
c6739443 CS |
2614 | return; |
2615 | } | |
2616 | ||
2617 | addr6 = (struct sockaddr_in6 *)address; | |
2618 | port = ntohs(addr6->sin6_port); | |
2619 | /* | |
2620 | * This is a special case that is safely ignored. | |
2621 | */ | |
2622 | if (port == 0) | |
2623 | return; | |
2624 | ||
2625 | /* | |
2626 | * Look for an existing port list entry. | |
2627 | * This is an indication that a port is getting reused. | |
2628 | */ | |
3c7ce342 VG |
2629 | rcu_read_lock(); |
2630 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2631 | if (spp->smk_port != port || spp->smk_sock_type != sock->type) |
c6739443 | 2632 | continue; |
0c96d1f5 VG |
2633 | if (spp->smk_can_reuse != 1) { |
2634 | rcu_read_unlock(); | |
2635 | return; | |
2636 | } | |
c6739443 CS |
2637 | spp->smk_port = port; |
2638 | spp->smk_sock = sk; | |
2639 | spp->smk_in = ssp->smk_in; | |
2640 | spp->smk_out = ssp->smk_out; | |
0c96d1f5 | 2641 | spp->smk_can_reuse = 0; |
3c7ce342 | 2642 | rcu_read_unlock(); |
c6739443 CS |
2643 | return; |
2644 | } | |
3c7ce342 | 2645 | rcu_read_unlock(); |
c6739443 CS |
2646 | /* |
2647 | * A new port entry is required. | |
2648 | */ | |
2649 | spp = kzalloc(sizeof(*spp), GFP_KERNEL); | |
2650 | if (spp == NULL) | |
2651 | return; | |
2652 | ||
2653 | spp->smk_port = port; | |
2654 | spp->smk_sock = sk; | |
2655 | spp->smk_in = ssp->smk_in; | |
2656 | spp->smk_out = ssp->smk_out; | |
9d44c973 | 2657 | spp->smk_sock_type = sock->type; |
0c96d1f5 | 2658 | spp->smk_can_reuse = 0; |
c6739443 | 2659 | |
3c7ce342 VG |
2660 | mutex_lock(&smack_ipv6_lock); |
2661 | list_add_rcu(&spp->list, &smk_ipv6_port_list); | |
2662 | mutex_unlock(&smack_ipv6_lock); | |
c6739443 CS |
2663 | return; |
2664 | } | |
2665 | ||
2666 | /** | |
2667 | * smk_ipv6_port_check - check Smack port access | |
2668 | * @sock: socket | |
2669 | * @address: address | |
2670 | * | |
2671 | * Create or update the port list entry | |
2672 | */ | |
6ea06247 | 2673 | static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, |
c6739443 CS |
2674 | int act) |
2675 | { | |
c6739443 CS |
2676 | struct smk_port_label *spp; |
2677 | struct socket_smack *ssp = sk->sk_security; | |
21abb1ec CS |
2678 | struct smack_known *skp = NULL; |
2679 | unsigned short port; | |
21c7eae2 | 2680 | struct smack_known *object; |
c6739443 CS |
2681 | |
2682 | if (act == SMK_RECEIVING) { | |
21abb1ec | 2683 | skp = smack_ipv6host_label(address); |
21c7eae2 | 2684 | object = ssp->smk_in; |
c6739443 | 2685 | } else { |
2f823ff8 | 2686 | skp = ssp->smk_out; |
21abb1ec | 2687 | object = smack_ipv6host_label(address); |
c6739443 CS |
2688 | } |
2689 | ||
2690 | /* | |
21abb1ec | 2691 | * The other end is a single label host. |
c6739443 | 2692 | */ |
21abb1ec CS |
2693 | if (skp != NULL && object != NULL) |
2694 | return smk_ipv6_check(skp, object, address, act); | |
2695 | if (skp == NULL) | |
2696 | skp = smack_net_ambient; | |
2697 | if (object == NULL) | |
2698 | object = smack_net_ambient; | |
c6739443 CS |
2699 | |
2700 | /* | |
2701 | * It's remote, so port lookup does no good. | |
2702 | */ | |
21abb1ec CS |
2703 | if (!smk_ipv6_localhost(address)) |
2704 | return smk_ipv6_check(skp, object, address, act); | |
c6739443 CS |
2705 | |
2706 | /* | |
2707 | * It's local so the send check has to have passed. | |
2708 | */ | |
21abb1ec CS |
2709 | if (act == SMK_RECEIVING) |
2710 | return 0; | |
c6739443 | 2711 | |
21abb1ec | 2712 | port = ntohs(address->sin6_port); |
3c7ce342 VG |
2713 | rcu_read_lock(); |
2714 | list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) { | |
9d44c973 | 2715 | if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type) |
c6739443 | 2716 | continue; |
21c7eae2 | 2717 | object = spp->smk_in; |
c6739443 | 2718 | if (act == SMK_CONNECTING) |
54e70ec5 | 2719 | ssp->smk_packet = spp->smk_out; |
c6739443 CS |
2720 | break; |
2721 | } | |
3c7ce342 | 2722 | rcu_read_unlock(); |
c6739443 | 2723 | |
21abb1ec | 2724 | return smk_ipv6_check(skp, object, address, act); |
c6739443 | 2725 | } |
21abb1ec | 2726 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2727 | |
e114e473 CS |
2728 | /** |
2729 | * smack_inode_setsecurity - set smack xattrs | |
2730 | * @inode: the object | |
2731 | * @name: attribute name | |
2732 | * @value: attribute value | |
2733 | * @size: size of the attribute | |
2734 | * @flags: unused | |
2735 | * | |
2736 | * Sets the named attribute in the appropriate blob | |
2737 | * | |
2738 | * Returns 0 on success, or an error code | |
2739 | */ | |
2740 | static int smack_inode_setsecurity(struct inode *inode, const char *name, | |
2741 | const void *value, size_t size, int flags) | |
2742 | { | |
2f823ff8 | 2743 | struct smack_known *skp; |
e114e473 CS |
2744 | struct inode_smack *nsp = inode->i_security; |
2745 | struct socket_smack *ssp; | |
2746 | struct socket *sock; | |
4bc87e62 | 2747 | int rc = 0; |
e114e473 | 2748 | |
f7112e6c | 2749 | if (value == NULL || size > SMK_LONGLABEL || size == 0) |
5e9ab593 | 2750 | return -EINVAL; |
e114e473 | 2751 | |
2f823ff8 | 2752 | skp = smk_import_entry(value, size); |
e774ad68 LP |
2753 | if (IS_ERR(skp)) |
2754 | return PTR_ERR(skp); | |
e114e473 CS |
2755 | |
2756 | if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { | |
21c7eae2 | 2757 | nsp->smk_inode = skp; |
ddd29ec6 | 2758 | nsp->smk_flags |= SMK_INODE_INSTANT; |
e114e473 CS |
2759 | return 0; |
2760 | } | |
2761 | /* | |
2762 | * The rest of the Smack xattrs are only on sockets. | |
2763 | */ | |
2764 | if (inode->i_sb->s_magic != SOCKFS_MAGIC) | |
2765 | return -EOPNOTSUPP; | |
2766 | ||
2767 | sock = SOCKET_I(inode); | |
2e1d146a | 2768 | if (sock == NULL || sock->sk == NULL) |
e114e473 CS |
2769 | return -EOPNOTSUPP; |
2770 | ||
2771 | ssp = sock->sk->sk_security; | |
2772 | ||
2773 | if (strcmp(name, XATTR_SMACK_IPIN) == 0) | |
54e70ec5 | 2774 | ssp->smk_in = skp; |
e114e473 | 2775 | else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { |
2f823ff8 | 2776 | ssp->smk_out = skp; |
c6739443 | 2777 | if (sock->sk->sk_family == PF_INET) { |
b4e0d5f0 CS |
2778 | rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2779 | if (rc != 0) | |
2780 | printk(KERN_WARNING | |
2781 | "Smack: \"%s\" netlbl error %d.\n", | |
2782 | __func__, -rc); | |
2783 | } | |
e114e473 CS |
2784 | } else |
2785 | return -EOPNOTSUPP; | |
2786 | ||
21abb1ec | 2787 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2788 | if (sock->sk->sk_family == PF_INET6) |
2789 | smk_ipv6_port_label(sock, NULL); | |
21abb1ec | 2790 | #endif |
c6739443 | 2791 | |
e114e473 CS |
2792 | return 0; |
2793 | } | |
2794 | ||
2795 | /** | |
2796 | * smack_socket_post_create - finish socket setup | |
2797 | * @sock: the socket | |
2798 | * @family: protocol family | |
2799 | * @type: unused | |
2800 | * @protocol: unused | |
2801 | * @kern: unused | |
2802 | * | |
2803 | * Sets the netlabel information on the socket | |
2804 | * | |
2805 | * Returns 0 on success, and error code otherwise | |
2806 | */ | |
2807 | static int smack_socket_post_create(struct socket *sock, int family, | |
2808 | int type, int protocol, int kern) | |
2809 | { | |
7412301b ML |
2810 | struct socket_smack *ssp; |
2811 | ||
2812 | if (sock->sk == NULL) | |
2813 | return 0; | |
2814 | ||
2815 | /* | |
2816 | * Sockets created by kernel threads receive web label. | |
2817 | */ | |
2818 | if (unlikely(current->flags & PF_KTHREAD)) { | |
2819 | ssp = sock->sk->sk_security; | |
2820 | ssp->smk_in = &smack_known_web; | |
2821 | ssp->smk_out = &smack_known_web; | |
2822 | } | |
2823 | ||
2824 | if (family != PF_INET) | |
e114e473 CS |
2825 | return 0; |
2826 | /* | |
2827 | * Set the outbound netlbl. | |
2828 | */ | |
6d3dc07c CS |
2829 | return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); |
2830 | } | |
2831 | ||
5859cdf5 TG |
2832 | /** |
2833 | * smack_socket_socketpair - create socket pair | |
2834 | * @socka: one socket | |
2835 | * @sockb: another socket | |
2836 | * | |
2837 | * Cross reference the peer labels for SO_PEERSEC | |
2838 | * | |
2839 | * Returns 0 on success, and error code otherwise | |
2840 | */ | |
2841 | static int smack_socket_socketpair(struct socket *socka, | |
2842 | struct socket *sockb) | |
2843 | { | |
2844 | struct socket_smack *asp = socka->sk->sk_security; | |
2845 | struct socket_smack *bsp = sockb->sk->sk_security; | |
2846 | ||
2847 | asp->smk_packet = bsp->smk_out; | |
2848 | bsp->smk_packet = asp->smk_out; | |
2849 | ||
2850 | return 0; | |
2851 | } | |
2852 | ||
21abb1ec | 2853 | #ifdef SMACK_IPV6_PORT_LABELING |
c6739443 CS |
2854 | /** |
2855 | * smack_socket_bind - record port binding information. | |
2856 | * @sock: the socket | |
2857 | * @address: the port address | |
2858 | * @addrlen: size of the address | |
2859 | * | |
2860 | * Records the label bound to a port. | |
2861 | * | |
2862 | * Returns 0 | |
2863 | */ | |
2864 | static int smack_socket_bind(struct socket *sock, struct sockaddr *address, | |
2865 | int addrlen) | |
2866 | { | |
2867 | if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) | |
2868 | smk_ipv6_port_label(sock, address); | |
c6739443 CS |
2869 | return 0; |
2870 | } | |
21abb1ec | 2871 | #endif /* SMACK_IPV6_PORT_LABELING */ |
c6739443 | 2872 | |
6d3dc07c CS |
2873 | /** |
2874 | * smack_socket_connect - connect access check | |
2875 | * @sock: the socket | |
2876 | * @sap: the other end | |
2877 | * @addrlen: size of sap | |
2878 | * | |
2879 | * Verifies that a connection may be possible | |
2880 | * | |
2881 | * Returns 0 on success, and error code otherwise | |
2882 | */ | |
2883 | static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, | |
2884 | int addrlen) | |
2885 | { | |
c6739443 | 2886 | int rc = 0; |
21abb1ec CS |
2887 | #if IS_ENABLED(CONFIG_IPV6) |
2888 | struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap; | |
2889 | #endif | |
2890 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
2891 | struct smack_known *rsp; | |
da49b5da | 2892 | struct socket_smack *ssp; |
21abb1ec | 2893 | #endif |
c6739443 CS |
2894 | |
2895 | if (sock->sk == NULL) | |
6d3dc07c | 2896 | return 0; |
6d3dc07c | 2897 | |
da49b5da VG |
2898 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2899 | ssp = sock->sk->sk_security; | |
2900 | #endif | |
2901 | ||
c6739443 CS |
2902 | switch (sock->sk->sk_family) { |
2903 | case PF_INET: | |
2904 | if (addrlen < sizeof(struct sockaddr_in)) | |
2905 | return -EINVAL; | |
2906 | rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); | |
2907 | break; | |
2908 | case PF_INET6: | |
2909 | if (addrlen < sizeof(struct sockaddr_in6)) | |
2910 | return -EINVAL; | |
21abb1ec CS |
2911 | #ifdef SMACK_IPV6_SECMARK_LABELING |
2912 | rsp = smack_ipv6host_label(sip); | |
2913 | if (rsp != NULL) | |
2914 | rc = smk_ipv6_check(ssp->smk_out, rsp, sip, | |
6ea06247 | 2915 | SMK_CONNECTING); |
21abb1ec CS |
2916 | #endif |
2917 | #ifdef SMACK_IPV6_PORT_LABELING | |
2918 | rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING); | |
2919 | #endif | |
c6739443 CS |
2920 | break; |
2921 | } | |
2922 | return rc; | |
e114e473 CS |
2923 | } |
2924 | ||
2925 | /** | |
2926 | * smack_flags_to_may - convert S_ to MAY_ values | |
2927 | * @flags: the S_ value | |
2928 | * | |
2929 | * Returns the equivalent MAY_ value | |
2930 | */ | |
2931 | static int smack_flags_to_may(int flags) | |
2932 | { | |
2933 | int may = 0; | |
2934 | ||
2935 | if (flags & S_IRUGO) | |
2936 | may |= MAY_READ; | |
2937 | if (flags & S_IWUGO) | |
2938 | may |= MAY_WRITE; | |
2939 | if (flags & S_IXUGO) | |
2940 | may |= MAY_EXEC; | |
2941 | ||
2942 | return may; | |
2943 | } | |
2944 | ||
2945 | /** | |
2946 | * smack_msg_msg_alloc_security - Set the security blob for msg_msg | |
2947 | * @msg: the object | |
2948 | * | |
2949 | * Returns 0 | |
2950 | */ | |
2951 | static int smack_msg_msg_alloc_security(struct msg_msg *msg) | |
2952 | { | |
2f823ff8 CS |
2953 | struct smack_known *skp = smk_of_current(); |
2954 | ||
21c7eae2 | 2955 | msg->security = skp; |
e114e473 CS |
2956 | return 0; |
2957 | } | |
2958 | ||
2959 | /** | |
2960 | * smack_msg_msg_free_security - Clear the security blob for msg_msg | |
2961 | * @msg: the object | |
2962 | * | |
2963 | * Clears the blob pointer | |
2964 | */ | |
2965 | static void smack_msg_msg_free_security(struct msg_msg *msg) | |
2966 | { | |
2967 | msg->security = NULL; | |
2968 | } | |
2969 | ||
2970 | /** | |
0d79cbf8 EB |
2971 | * smack_of_ipc - the smack pointer for the ipc |
2972 | * @isp: the object | |
e114e473 CS |
2973 | * |
2974 | * Returns a pointer to the smack value | |
2975 | */ | |
0d79cbf8 | 2976 | static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) |
e114e473 | 2977 | { |
0d79cbf8 | 2978 | return (struct smack_known *)isp->security; |
e114e473 CS |
2979 | } |
2980 | ||
2981 | /** | |
0d79cbf8 EB |
2982 | * smack_ipc_alloc_security - Set the security blob for ipc |
2983 | * @isp: the object | |
e114e473 CS |
2984 | * |
2985 | * Returns 0 | |
2986 | */ | |
0d79cbf8 | 2987 | static int smack_ipc_alloc_security(struct kern_ipc_perm *isp) |
e114e473 | 2988 | { |
2f823ff8 | 2989 | struct smack_known *skp = smk_of_current(); |
e114e473 | 2990 | |
21c7eae2 | 2991 | isp->security = skp; |
e114e473 CS |
2992 | return 0; |
2993 | } | |
2994 | ||
2995 | /** | |
0d79cbf8 EB |
2996 | * smack_ipc_free_security - Clear the security blob for ipc |
2997 | * @isp: the object | |
e114e473 CS |
2998 | * |
2999 | * Clears the blob pointer | |
3000 | */ | |
0d79cbf8 | 3001 | static void smack_ipc_free_security(struct kern_ipc_perm *isp) |
e114e473 | 3002 | { |
e114e473 CS |
3003 | isp->security = NULL; |
3004 | } | |
3005 | ||
ecfcc53f EB |
3006 | /** |
3007 | * smk_curacc_shm : check if current has access on shm | |
0d79cbf8 | 3008 | * @isp : the object |
ecfcc53f EB |
3009 | * @access : access requested |
3010 | * | |
3011 | * Returns 0 if current has the requested access, error code otherwise | |
3012 | */ | |
0d79cbf8 | 3013 | static int smk_curacc_shm(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3014 | { |
0d79cbf8 | 3015 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3016 | struct smk_audit_info ad; |
d166c802 | 3017 | int rc; |
ecfcc53f EB |
3018 | |
3019 | #ifdef CONFIG_AUDIT | |
3020 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3021 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3022 | #endif |
d166c802 CS |
3023 | rc = smk_curacc(ssp, access, &ad); |
3024 | rc = smk_bu_current("shm", ssp, access, rc); | |
3025 | return rc; | |
ecfcc53f EB |
3026 | } |
3027 | ||
e114e473 CS |
3028 | /** |
3029 | * smack_shm_associate - Smack access check for shm | |
0d79cbf8 | 3030 | * @isp: the object |
e114e473 CS |
3031 | * @shmflg: access requested |
3032 | * | |
3033 | * Returns 0 if current has the requested access, error code otherwise | |
3034 | */ | |
0d79cbf8 | 3035 | static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg) |
e114e473 | 3036 | { |
e114e473 CS |
3037 | int may; |
3038 | ||
3039 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 3040 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3041 | } |
3042 | ||
3043 | /** | |
3044 | * smack_shm_shmctl - Smack access check for shm | |
0d79cbf8 | 3045 | * @isp: the object |
e114e473 CS |
3046 | * @cmd: what it wants to do |
3047 | * | |
3048 | * Returns 0 if current has the requested access, error code otherwise | |
3049 | */ | |
0d79cbf8 | 3050 | static int smack_shm_shmctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3051 | { |
e114e473 CS |
3052 | int may; |
3053 | ||
3054 | switch (cmd) { | |
3055 | case IPC_STAT: | |
3056 | case SHM_STAT: | |
c21a6970 | 3057 | case SHM_STAT_ANY: |
e114e473 CS |
3058 | may = MAY_READ; |
3059 | break; | |
3060 | case IPC_SET: | |
3061 | case SHM_LOCK: | |
3062 | case SHM_UNLOCK: | |
3063 | case IPC_RMID: | |
3064 | may = MAY_READWRITE; | |
3065 | break; | |
3066 | case IPC_INFO: | |
3067 | case SHM_INFO: | |
3068 | /* | |
3069 | * System level information. | |
3070 | */ | |
3071 | return 0; | |
3072 | default: | |
3073 | return -EINVAL; | |
3074 | } | |
0d79cbf8 | 3075 | return smk_curacc_shm(isp, may); |
e114e473 CS |
3076 | } |
3077 | ||
3078 | /** | |
3079 | * smack_shm_shmat - Smack access for shmat | |
0d79cbf8 | 3080 | * @isp: the object |
e114e473 CS |
3081 | * @shmaddr: unused |
3082 | * @shmflg: access requested | |
3083 | * | |
3084 | * Returns 0 if current has the requested access, error code otherwise | |
3085 | */ | |
0d79cbf8 | 3086 | static int smack_shm_shmat(struct kern_ipc_perm *ipc, char __user *shmaddr, |
e114e473 CS |
3087 | int shmflg) |
3088 | { | |
e114e473 CS |
3089 | int may; |
3090 | ||
3091 | may = smack_flags_to_may(shmflg); | |
0d79cbf8 | 3092 | return smk_curacc_shm(ipc, may); |
e114e473 CS |
3093 | } |
3094 | ||
ecfcc53f EB |
3095 | /** |
3096 | * smk_curacc_sem : check if current has access on sem | |
0d79cbf8 | 3097 | * @isp : the object |
ecfcc53f EB |
3098 | * @access : access requested |
3099 | * | |
3100 | * Returns 0 if current has the requested access, error code otherwise | |
3101 | */ | |
0d79cbf8 | 3102 | static int smk_curacc_sem(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3103 | { |
0d79cbf8 | 3104 | struct smack_known *ssp = smack_of_ipc(isp); |
ecfcc53f | 3105 | struct smk_audit_info ad; |
d166c802 | 3106 | int rc; |
ecfcc53f EB |
3107 | |
3108 | #ifdef CONFIG_AUDIT | |
3109 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3110 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3111 | #endif |
d166c802 CS |
3112 | rc = smk_curacc(ssp, access, &ad); |
3113 | rc = smk_bu_current("sem", ssp, access, rc); | |
3114 | return rc; | |
ecfcc53f EB |
3115 | } |
3116 | ||
e114e473 CS |
3117 | /** |
3118 | * smack_sem_associate - Smack access check for sem | |
0d79cbf8 | 3119 | * @isp: the object |
e114e473 CS |
3120 | * @semflg: access requested |
3121 | * | |
3122 | * Returns 0 if current has the requested access, error code otherwise | |
3123 | */ | |
0d79cbf8 | 3124 | static int smack_sem_associate(struct kern_ipc_perm *isp, int semflg) |
e114e473 | 3125 | { |
e114e473 CS |
3126 | int may; |
3127 | ||
3128 | may = smack_flags_to_may(semflg); | |
0d79cbf8 | 3129 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3130 | } |
3131 | ||
3132 | /** | |
3133 | * smack_sem_shmctl - Smack access check for sem | |
0d79cbf8 | 3134 | * @isp: the object |
e114e473 CS |
3135 | * @cmd: what it wants to do |
3136 | * | |
3137 | * Returns 0 if current has the requested access, error code otherwise | |
3138 | */ | |
0d79cbf8 | 3139 | static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3140 | { |
e114e473 CS |
3141 | int may; |
3142 | ||
3143 | switch (cmd) { | |
3144 | case GETPID: | |
3145 | case GETNCNT: | |
3146 | case GETZCNT: | |
3147 | case GETVAL: | |
3148 | case GETALL: | |
3149 | case IPC_STAT: | |
3150 | case SEM_STAT: | |
a280d6dc | 3151 | case SEM_STAT_ANY: |
e114e473 CS |
3152 | may = MAY_READ; |
3153 | break; | |
3154 | case SETVAL: | |
3155 | case SETALL: | |
3156 | case IPC_RMID: | |
3157 | case IPC_SET: | |
3158 | may = MAY_READWRITE; | |
3159 | break; | |
3160 | case IPC_INFO: | |
3161 | case SEM_INFO: | |
3162 | /* | |
3163 | * System level information | |
3164 | */ | |
3165 | return 0; | |
3166 | default: | |
3167 | return -EINVAL; | |
3168 | } | |
3169 | ||
0d79cbf8 | 3170 | return smk_curacc_sem(isp, may); |
e114e473 CS |
3171 | } |
3172 | ||
3173 | /** | |
3174 | * smack_sem_semop - Smack checks of semaphore operations | |
0d79cbf8 | 3175 | * @isp: the object |
e114e473 CS |
3176 | * @sops: unused |
3177 | * @nsops: unused | |
3178 | * @alter: unused | |
3179 | * | |
3180 | * Treated as read and write in all cases. | |
3181 | * | |
3182 | * Returns 0 if access is allowed, error code otherwise | |
3183 | */ | |
0d79cbf8 | 3184 | static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops, |
e114e473 CS |
3185 | unsigned nsops, int alter) |
3186 | { | |
0d79cbf8 | 3187 | return smk_curacc_sem(isp, MAY_READWRITE); |
e114e473 CS |
3188 | } |
3189 | ||
ecfcc53f EB |
3190 | /** |
3191 | * smk_curacc_msq : helper to check if current has access on msq | |
0d79cbf8 | 3192 | * @isp : the msq |
ecfcc53f EB |
3193 | * @access : access requested |
3194 | * | |
3195 | * return 0 if current has access, error otherwise | |
3196 | */ | |
0d79cbf8 | 3197 | static int smk_curacc_msq(struct kern_ipc_perm *isp, int access) |
ecfcc53f | 3198 | { |
0d79cbf8 | 3199 | struct smack_known *msp = smack_of_ipc(isp); |
ecfcc53f | 3200 | struct smk_audit_info ad; |
d166c802 | 3201 | int rc; |
ecfcc53f EB |
3202 | |
3203 | #ifdef CONFIG_AUDIT | |
3204 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
0d79cbf8 | 3205 | ad.a.u.ipc_id = isp->id; |
ecfcc53f | 3206 | #endif |
d166c802 CS |
3207 | rc = smk_curacc(msp, access, &ad); |
3208 | rc = smk_bu_current("msq", msp, access, rc); | |
3209 | return rc; | |
ecfcc53f EB |
3210 | } |
3211 | ||
e114e473 CS |
3212 | /** |
3213 | * smack_msg_queue_associate - Smack access check for msg_queue | |
0d79cbf8 | 3214 | * @isp: the object |
e114e473 CS |
3215 | * @msqflg: access requested |
3216 | * | |
3217 | * Returns 0 if current has the requested access, error code otherwise | |
3218 | */ | |
0d79cbf8 | 3219 | static int smack_msg_queue_associate(struct kern_ipc_perm *isp, int msqflg) |
e114e473 | 3220 | { |
e114e473 CS |
3221 | int may; |
3222 | ||
3223 | may = smack_flags_to_may(msqflg); | |
0d79cbf8 | 3224 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3225 | } |
3226 | ||
3227 | /** | |
3228 | * smack_msg_queue_msgctl - Smack access check for msg_queue | |
0d79cbf8 | 3229 | * @isp: the object |
e114e473 CS |
3230 | * @cmd: what it wants to do |
3231 | * | |
3232 | * Returns 0 if current has the requested access, error code otherwise | |
3233 | */ | |
0d79cbf8 | 3234 | static int smack_msg_queue_msgctl(struct kern_ipc_perm *isp, int cmd) |
e114e473 | 3235 | { |
e114e473 CS |
3236 | int may; |
3237 | ||
3238 | switch (cmd) { | |
3239 | case IPC_STAT: | |
3240 | case MSG_STAT: | |
23c8cec8 | 3241 | case MSG_STAT_ANY: |
e114e473 CS |
3242 | may = MAY_READ; |
3243 | break; | |
3244 | case IPC_SET: | |
3245 | case IPC_RMID: | |
3246 | may = MAY_READWRITE; | |
3247 | break; | |
3248 | case IPC_INFO: | |
3249 | case MSG_INFO: | |
3250 | /* | |
3251 | * System level information | |
3252 | */ | |
3253 | return 0; | |
3254 | default: | |
3255 | return -EINVAL; | |
3256 | } | |
3257 | ||
0d79cbf8 | 3258 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3259 | } |
3260 | ||
3261 | /** | |
3262 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3263 | * @isp: the object |
e114e473 CS |
3264 | * @msg: unused |
3265 | * @msqflg: access requested | |
3266 | * | |
3267 | * Returns 0 if current has the requested access, error code otherwise | |
3268 | */ | |
0d79cbf8 | 3269 | static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3270 | int msqflg) |
3271 | { | |
ecfcc53f | 3272 | int may; |
e114e473 | 3273 | |
ecfcc53f | 3274 | may = smack_flags_to_may(msqflg); |
0d79cbf8 | 3275 | return smk_curacc_msq(isp, may); |
e114e473 CS |
3276 | } |
3277 | ||
3278 | /** | |
3279 | * smack_msg_queue_msgsnd - Smack access check for msg_queue | |
0d79cbf8 | 3280 | * @isp: the object |
e114e473 CS |
3281 | * @msg: unused |
3282 | * @target: unused | |
3283 | * @type: unused | |
3284 | * @mode: unused | |
3285 | * | |
3286 | * Returns 0 if current has read and write access, error code otherwise | |
3287 | */ | |
0d79cbf8 | 3288 | static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg, |
e114e473 CS |
3289 | struct task_struct *target, long type, int mode) |
3290 | { | |
0d79cbf8 | 3291 | return smk_curacc_msq(isp, MAY_READWRITE); |
e114e473 CS |
3292 | } |
3293 | ||
3294 | /** | |
3295 | * smack_ipc_permission - Smack access for ipc_permission() | |
3296 | * @ipp: the object permissions | |
3297 | * @flag: access requested | |
3298 | * | |
3299 | * Returns 0 if current has read and write access, error code otherwise | |
3300 | */ | |
3301 | static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) | |
3302 | { | |
21c7eae2 | 3303 | struct smack_known *iskp = ipp->security; |
ecfcc53f EB |
3304 | int may = smack_flags_to_may(flag); |
3305 | struct smk_audit_info ad; | |
d166c802 | 3306 | int rc; |
e114e473 | 3307 | |
ecfcc53f EB |
3308 | #ifdef CONFIG_AUDIT |
3309 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); | |
3310 | ad.a.u.ipc_id = ipp->id; | |
3311 | #endif | |
21c7eae2 LP |
3312 | rc = smk_curacc(iskp, may, &ad); |
3313 | rc = smk_bu_current("svipc", iskp, may, rc); | |
d166c802 | 3314 | return rc; |
e114e473 CS |
3315 | } |
3316 | ||
d20bdda6 AD |
3317 | /** |
3318 | * smack_ipc_getsecid - Extract smack security id | |
251a2a95 | 3319 | * @ipp: the object permissions |
d20bdda6 AD |
3320 | * @secid: where result will be saved |
3321 | */ | |
3322 | static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) | |
3323 | { | |
21c7eae2 | 3324 | struct smack_known *iskp = ipp->security; |
d20bdda6 | 3325 | |
21c7eae2 | 3326 | *secid = iskp->smk_secid; |
d20bdda6 AD |
3327 | } |
3328 | ||
e114e473 CS |
3329 | /** |
3330 | * smack_d_instantiate - Make sure the blob is correct on an inode | |
3e62cbb8 | 3331 | * @opt_dentry: dentry where inode will be attached |
e114e473 CS |
3332 | * @inode: the object |
3333 | * | |
3334 | * Set the inode's security blob if it hasn't been done already. | |
3335 | */ | |
3336 | static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) | |
3337 | { | |
3338 | struct super_block *sbp; | |
3339 | struct superblock_smack *sbsp; | |
3340 | struct inode_smack *isp; | |
2f823ff8 CS |
3341 | struct smack_known *skp; |
3342 | struct smack_known *ckp = smk_of_current(); | |
21c7eae2 | 3343 | struct smack_known *final; |
5c6d1125 JS |
3344 | char trattr[TRANS_TRUE_SIZE]; |
3345 | int transflag = 0; | |
2267b13a | 3346 | int rc; |
e114e473 CS |
3347 | struct dentry *dp; |
3348 | ||
3349 | if (inode == NULL) | |
3350 | return; | |
3351 | ||
3352 | isp = inode->i_security; | |
3353 | ||
3354 | mutex_lock(&isp->smk_lock); | |
3355 | /* | |
3356 | * If the inode is already instantiated | |
3357 | * take the quick way out | |
3358 | */ | |
3359 | if (isp->smk_flags & SMK_INODE_INSTANT) | |
3360 | goto unlockandout; | |
3361 | ||
3362 | sbp = inode->i_sb; | |
3363 | sbsp = sbp->s_security; | |
3364 | /* | |
3365 | * We're going to use the superblock default label | |
3366 | * if there's no label on the file. | |
3367 | */ | |
3368 | final = sbsp->smk_default; | |
3369 | ||
e97dcb0e CS |
3370 | /* |
3371 | * If this is the root inode the superblock | |
3372 | * may be in the process of initialization. | |
3373 | * If that is the case use the root value out | |
3374 | * of the superblock. | |
3375 | */ | |
3376 | if (opt_dentry->d_parent == opt_dentry) { | |
1d8c2326 ŁS |
3377 | switch (sbp->s_magic) { |
3378 | case CGROUP_SUPER_MAGIC: | |
58c442f3 | 3379 | case CGROUP2_SUPER_MAGIC: |
36ea735b CS |
3380 | /* |
3381 | * The cgroup filesystem is never mounted, | |
3382 | * so there's no opportunity to set the mount | |
3383 | * options. | |
3384 | */ | |
21c7eae2 LP |
3385 | sbsp->smk_root = &smack_known_star; |
3386 | sbsp->smk_default = &smack_known_star; | |
1d8c2326 ŁS |
3387 | isp->smk_inode = sbsp->smk_root; |
3388 | break; | |
3389 | case TMPFS_MAGIC: | |
3390 | /* | |
3391 | * What about shmem/tmpfs anonymous files with dentry | |
3392 | * obtained from d_alloc_pseudo()? | |
3393 | */ | |
3394 | isp->smk_inode = smk_of_current(); | |
3395 | break; | |
8da4aba5 RK |
3396 | case PIPEFS_MAGIC: |
3397 | isp->smk_inode = smk_of_current(); | |
3398 | break; | |
805b65a8 RK |
3399 | case SOCKFS_MAGIC: |
3400 | /* | |
3401 | * Socket access is controlled by the socket | |
3402 | * structures associated with the task involved. | |
3403 | */ | |
3404 | isp->smk_inode = &smack_known_star; | |
3405 | break; | |
1d8c2326 ŁS |
3406 | default: |
3407 | isp->smk_inode = sbsp->smk_root; | |
3408 | break; | |
36ea735b | 3409 | } |
e97dcb0e CS |
3410 | isp->smk_flags |= SMK_INODE_INSTANT; |
3411 | goto unlockandout; | |
3412 | } | |
3413 | ||
e114e473 CS |
3414 | /* |
3415 | * This is pretty hackish. | |
3416 | * Casey says that we shouldn't have to do | |
3417 | * file system specific code, but it does help | |
3418 | * with keeping it simple. | |
3419 | */ | |
3420 | switch (sbp->s_magic) { | |
3421 | case SMACK_MAGIC: | |
36ea735b | 3422 | case CGROUP_SUPER_MAGIC: |
58c442f3 | 3423 | case CGROUP2_SUPER_MAGIC: |
e114e473 | 3424 | /* |
25985edc | 3425 | * Casey says that it's a little embarrassing |
e114e473 CS |
3426 | * that the smack file system doesn't do |
3427 | * extended attributes. | |
36ea735b | 3428 | * |
36ea735b | 3429 | * Cgroupfs is special |
e114e473 | 3430 | */ |
21c7eae2 | 3431 | final = &smack_known_star; |
e114e473 CS |
3432 | break; |
3433 | case DEVPTS_SUPER_MAGIC: | |
3434 | /* | |
3435 | * devpts seems content with the label of the task. | |
3436 | * Programs that change smack have to treat the | |
3437 | * pty with respect. | |
3438 | */ | |
21c7eae2 | 3439 | final = ckp; |
e114e473 | 3440 | break; |
e114e473 CS |
3441 | case PROC_SUPER_MAGIC: |
3442 | /* | |
3443 | * Casey says procfs appears not to care. | |
3444 | * The superblock default suffices. | |
3445 | */ | |
3446 | break; | |
3447 | case TMPFS_MAGIC: | |
3448 | /* | |
3449 | * Device labels should come from the filesystem, | |
3450 | * but watch out, because they're volitile, | |
3451 | * getting recreated on every reboot. | |
3452 | */ | |
21c7eae2 | 3453 | final = &smack_known_star; |
e114e473 | 3454 | /* |
b1fed3ed | 3455 | * Fall through. |
e114e473 CS |
3456 | * |
3457 | * If a smack value has been set we want to use it, | |
3458 | * but since tmpfs isn't giving us the opportunity | |
3459 | * to set mount options simulate setting the | |
3460 | * superblock default. | |
3461 | */ | |
3462 | default: | |
3463 | /* | |
3464 | * This isn't an understood special case. | |
3465 | * Get the value from the xattr. | |
b4e0d5f0 CS |
3466 | */ |
3467 | ||
3468 | /* | |
3469 | * UNIX domain sockets use lower level socket data. | |
3470 | */ | |
3471 | if (S_ISSOCK(inode->i_mode)) { | |
21c7eae2 | 3472 | final = &smack_known_star; |
b4e0d5f0 CS |
3473 | break; |
3474 | } | |
3475 | /* | |
e114e473 CS |
3476 | * No xattr support means, alas, no SMACK label. |
3477 | * Use the aforeapplied default. | |
3478 | * It would be curious if the label of the task | |
3479 | * does not match that assigned. | |
3480 | */ | |
5d6c3191 AG |
3481 | if (!(inode->i_opflags & IOP_XATTR)) |
3482 | break; | |
e114e473 CS |
3483 | /* |
3484 | * Get the dentry for xattr. | |
3485 | */ | |
3e62cbb8 | 3486 | dp = dget(opt_dentry); |
2f823ff8 | 3487 | skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); |
e774ad68 | 3488 | if (!IS_ERR_OR_NULL(skp)) |
21c7eae2 | 3489 | final = skp; |
2267b13a CS |
3490 | |
3491 | /* | |
3492 | * Transmuting directory | |
3493 | */ | |
3494 | if (S_ISDIR(inode->i_mode)) { | |
3495 | /* | |
3496 | * If this is a new directory and the label was | |
3497 | * transmuted when the inode was initialized | |
3498 | * set the transmute attribute on the directory | |
3499 | * and mark the inode. | |
3500 | * | |
3501 | * If there is a transmute attribute on the | |
3502 | * directory mark the inode. | |
3503 | */ | |
3504 | if (isp->smk_flags & SMK_INODE_CHANGED) { | |
3505 | isp->smk_flags &= ~SMK_INODE_CHANGED; | |
5d6c3191 | 3506 | rc = __vfs_setxattr(dp, inode, |
5c6d1125 | 3507 | XATTR_NAME_SMACKTRANSMUTE, |
2267b13a CS |
3508 | TRANS_TRUE, TRANS_TRUE_SIZE, |
3509 | 0); | |
3510 | } else { | |
5d6c3191 | 3511 | rc = __vfs_getxattr(dp, inode, |
2267b13a CS |
3512 | XATTR_NAME_SMACKTRANSMUTE, trattr, |
3513 | TRANS_TRUE_SIZE); | |
3514 | if (rc >= 0 && strncmp(trattr, TRANS_TRUE, | |
3515 | TRANS_TRUE_SIZE) != 0) | |
3516 | rc = -EINVAL; | |
5c6d1125 | 3517 | } |
2267b13a CS |
3518 | if (rc >= 0) |
3519 | transflag = SMK_INODE_TRANSMUTE; | |
5c6d1125 | 3520 | } |
809c02e0 SF |
3521 | /* |
3522 | * Don't let the exec or mmap label be "*" or "@". | |
3523 | */ | |
3524 | skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); | |
3525 | if (IS_ERR(skp) || skp == &smack_known_star || | |
3526 | skp == &smack_known_web) | |
3527 | skp = NULL; | |
3528 | isp->smk_task = skp; | |
e774ad68 | 3529 | |
19760ad0 | 3530 | skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); |
e774ad68 LP |
3531 | if (IS_ERR(skp) || skp == &smack_known_star || |
3532 | skp == &smack_known_web) | |
19760ad0 CS |
3533 | skp = NULL; |
3534 | isp->smk_mmap = skp; | |
676dac4b | 3535 | |
e114e473 CS |
3536 | dput(dp); |
3537 | break; | |
3538 | } | |
3539 | ||
3540 | if (final == NULL) | |
21c7eae2 | 3541 | isp->smk_inode = ckp; |
e114e473 CS |
3542 | else |
3543 | isp->smk_inode = final; | |
3544 | ||
5c6d1125 | 3545 | isp->smk_flags |= (SMK_INODE_INSTANT | transflag); |
e114e473 CS |
3546 | |
3547 | unlockandout: | |
3548 | mutex_unlock(&isp->smk_lock); | |
3549 | return; | |
3550 | } | |
3551 | ||
3552 | /** | |
3553 | * smack_getprocattr - Smack process attribute access | |
3554 | * @p: the object task | |
3555 | * @name: the name of the attribute in /proc/.../attr | |
3556 | * @value: where to put the result | |
3557 | * | |
3558 | * Places a copy of the task Smack into value | |
3559 | * | |
3560 | * Returns the length of the smack label or an error code | |
3561 | */ | |
3562 | static int smack_getprocattr(struct task_struct *p, char *name, char **value) | |
3563 | { | |
6d1cff2a | 3564 | struct smack_known *skp = smk_of_task_struct(p); |
e114e473 CS |
3565 | char *cp; |
3566 | int slen; | |
3567 | ||
3568 | if (strcmp(name, "current") != 0) | |
3569 | return -EINVAL; | |
3570 | ||
2f823ff8 | 3571 | cp = kstrdup(skp->smk_known, GFP_KERNEL); |
e114e473 CS |
3572 | if (cp == NULL) |
3573 | return -ENOMEM; | |
3574 | ||
3575 | slen = strlen(cp); | |
3576 | *value = cp; | |
3577 | return slen; | |
3578 | } | |
3579 | ||
3580 | /** | |
3581 | * smack_setprocattr - Smack process attribute setting | |
e114e473 CS |
3582 | * @name: the name of the attribute in /proc/.../attr |
3583 | * @value: the value to set | |
3584 | * @size: the size of the value | |
3585 | * | |
3586 | * Sets the Smack value of the task. Only setting self | |
3587 | * is permitted and only with privilege | |
3588 | * | |
3589 | * Returns the length of the smack label or an error code | |
3590 | */ | |
b21507e2 | 3591 | static int smack_setprocattr(const char *name, void *value, size_t size) |
e114e473 | 3592 | { |
38416e53 | 3593 | struct task_smack *tsp = current_security(); |
d84f4f99 | 3594 | struct cred *new; |
2f823ff8 | 3595 | struct smack_known *skp; |
38416e53 ZJ |
3596 | struct smack_known_list_elem *sklep; |
3597 | int rc; | |
e114e473 | 3598 | |
38416e53 | 3599 | if (!smack_privileged(CAP_MAC_ADMIN) && list_empty(&tsp->smk_relabel)) |
5cd9c58f DH |
3600 | return -EPERM; |
3601 | ||
f7112e6c | 3602 | if (value == NULL || size == 0 || size >= SMK_LONGLABEL) |
e114e473 CS |
3603 | return -EINVAL; |
3604 | ||
3605 | if (strcmp(name, "current") != 0) | |
3606 | return -EINVAL; | |
3607 | ||
2f823ff8 | 3608 | skp = smk_import_entry(value, size); |
e774ad68 LP |
3609 | if (IS_ERR(skp)) |
3610 | return PTR_ERR(skp); | |
e114e473 | 3611 | |
6d3dc07c | 3612 | /* |
7128ea15 HS |
3613 | * No process is ever allowed the web ("@") label |
3614 | * and the star ("*") label. | |
6d3dc07c | 3615 | */ |
7128ea15 HS |
3616 | if (skp == &smack_known_web || skp == &smack_known_star) |
3617 | return -EINVAL; | |
6d3dc07c | 3618 | |
38416e53 ZJ |
3619 | if (!smack_privileged(CAP_MAC_ADMIN)) { |
3620 | rc = -EPERM; | |
3621 | list_for_each_entry(sklep, &tsp->smk_relabel, list) | |
3622 | if (sklep->smk_label == skp) { | |
3623 | rc = 0; | |
3624 | break; | |
3625 | } | |
3626 | if (rc) | |
3627 | return rc; | |
3628 | } | |
3629 | ||
d84f4f99 | 3630 | new = prepare_creds(); |
6d3dc07c | 3631 | if (new == NULL) |
d84f4f99 | 3632 | return -ENOMEM; |
7898e1f8 | 3633 | |
46a2f3b9 | 3634 | tsp = new->security; |
2f823ff8 | 3635 | tsp->smk_task = skp; |
38416e53 ZJ |
3636 | /* |
3637 | * process can change its label only once | |
3638 | */ | |
3639 | smk_destroy_label_list(&tsp->smk_relabel); | |
7898e1f8 | 3640 | |
d84f4f99 | 3641 | commit_creds(new); |
e114e473 CS |
3642 | return size; |
3643 | } | |
3644 | ||
3645 | /** | |
3646 | * smack_unix_stream_connect - Smack access on UDS | |
3610cda5 DM |
3647 | * @sock: one sock |
3648 | * @other: the other sock | |
e114e473 CS |
3649 | * @newsk: unused |
3650 | * | |
3651 | * Return 0 if a subject with the smack of sock could access | |
3652 | * an object with the smack of other, otherwise an error code | |
3653 | */ | |
3610cda5 DM |
3654 | static int smack_unix_stream_connect(struct sock *sock, |
3655 | struct sock *other, struct sock *newsk) | |
e114e473 | 3656 | { |
2f823ff8 | 3657 | struct smack_known *skp; |
54e70ec5 | 3658 | struct smack_known *okp; |
d2e7ad19 JM |
3659 | struct socket_smack *ssp = sock->sk_security; |
3660 | struct socket_smack *osp = other->sk_security; | |
975d5e55 | 3661 | struct socket_smack *nsp = newsk->sk_security; |
ecfcc53f | 3662 | struct smk_audit_info ad; |
b4e0d5f0 | 3663 | int rc = 0; |
923e9a13 KC |
3664 | #ifdef CONFIG_AUDIT |
3665 | struct lsm_network_audit net; | |
923e9a13 | 3666 | #endif |
b4e0d5f0 | 3667 | |
2f823ff8 CS |
3668 | if (!smack_privileged(CAP_MAC_OVERRIDE)) { |
3669 | skp = ssp->smk_out; | |
96be7b54 | 3670 | okp = osp->smk_in; |
54e70ec5 CS |
3671 | #ifdef CONFIG_AUDIT |
3672 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
3673 | smk_ad_setfield_u_net_sk(&ad, other); | |
3674 | #endif | |
21c7eae2 LP |
3675 | rc = smk_access(skp, okp, MAY_WRITE, &ad); |
3676 | rc = smk_bu_note("UDS connect", skp, okp, MAY_WRITE, rc); | |
d166c802 | 3677 | if (rc == 0) { |
96be7b54 ZJ |
3678 | okp = osp->smk_out; |
3679 | skp = ssp->smk_in; | |
138a868f | 3680 | rc = smk_access(okp, skp, MAY_WRITE, &ad); |
21c7eae2 | 3681 | rc = smk_bu_note("UDS connect", okp, skp, |
d166c802 CS |
3682 | MAY_WRITE, rc); |
3683 | } | |
2f823ff8 | 3684 | } |
b4e0d5f0 | 3685 | |
975d5e55 CS |
3686 | /* |
3687 | * Cross reference the peer labels for SO_PEERSEC. | |
3688 | */ | |
3689 | if (rc == 0) { | |
54e70ec5 CS |
3690 | nsp->smk_packet = ssp->smk_out; |
3691 | ssp->smk_packet = osp->smk_out; | |
975d5e55 CS |
3692 | } |
3693 | ||
b4e0d5f0 | 3694 | return rc; |
e114e473 CS |
3695 | } |
3696 | ||
3697 | /** | |
3698 | * smack_unix_may_send - Smack access on UDS | |
3699 | * @sock: one socket | |
3700 | * @other: the other socket | |
3701 | * | |
3702 | * Return 0 if a subject with the smack of sock could access | |
3703 | * an object with the smack of other, otherwise an error code | |
3704 | */ | |
3705 | static int smack_unix_may_send(struct socket *sock, struct socket *other) | |
3706 | { | |
b4e0d5f0 CS |
3707 | struct socket_smack *ssp = sock->sk->sk_security; |
3708 | struct socket_smack *osp = other->sk->sk_security; | |
ecfcc53f | 3709 | struct smk_audit_info ad; |
d166c802 | 3710 | int rc; |
e114e473 | 3711 | |
923e9a13 KC |
3712 | #ifdef CONFIG_AUDIT |
3713 | struct lsm_network_audit net; | |
3714 | ||
48c62af6 | 3715 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
ecfcc53f | 3716 | smk_ad_setfield_u_net_sk(&ad, other->sk); |
923e9a13 | 3717 | #endif |
b4e0d5f0 | 3718 | |
2f823ff8 CS |
3719 | if (smack_privileged(CAP_MAC_OVERRIDE)) |
3720 | return 0; | |
b4e0d5f0 | 3721 | |
21c7eae2 LP |
3722 | rc = smk_access(ssp->smk_out, osp->smk_in, MAY_WRITE, &ad); |
3723 | rc = smk_bu_note("UDS send", ssp->smk_out, osp->smk_in, MAY_WRITE, rc); | |
d166c802 | 3724 | return rc; |
e114e473 CS |
3725 | } |
3726 | ||
6d3dc07c CS |
3727 | /** |
3728 | * smack_socket_sendmsg - Smack check based on destination host | |
3729 | * @sock: the socket | |
251a2a95 | 3730 | * @msg: the message |
6d3dc07c CS |
3731 | * @size: the size of the message |
3732 | * | |
c6739443 CS |
3733 | * Return 0 if the current subject can write to the destination host. |
3734 | * For IPv4 this is only a question if the destination is a single label host. | |
3735 | * For IPv6 this is a check against the label of the port. | |
6d3dc07c CS |
3736 | */ |
3737 | static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3738 | int size) | |
3739 | { | |
3740 | struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; | |
21abb1ec | 3741 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3742 | struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; |
21abb1ec CS |
3743 | #endif |
3744 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
3745 | struct socket_smack *ssp = sock->sk->sk_security; | |
3746 | struct smack_known *rsp; | |
3747 | #endif | |
c6739443 | 3748 | int rc = 0; |
6d3dc07c CS |
3749 | |
3750 | /* | |
3751 | * Perfectly reasonable for this to be NULL | |
3752 | */ | |
c6739443 | 3753 | if (sip == NULL) |
6d3dc07c CS |
3754 | return 0; |
3755 | ||
81bd0d56 | 3756 | switch (sock->sk->sk_family) { |
c6739443 CS |
3757 | case AF_INET: |
3758 | rc = smack_netlabel_send(sock->sk, sip); | |
3759 | break; | |
3760 | case AF_INET6: | |
21abb1ec CS |
3761 | #ifdef SMACK_IPV6_SECMARK_LABELING |
3762 | rsp = smack_ipv6host_label(sap); | |
3763 | if (rsp != NULL) | |
3764 | rc = smk_ipv6_check(ssp->smk_out, rsp, sap, | |
3765 | SMK_CONNECTING); | |
3766 | #endif | |
3767 | #ifdef SMACK_IPV6_PORT_LABELING | |
c6739443 | 3768 | rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); |
21abb1ec | 3769 | #endif |
c6739443 CS |
3770 | break; |
3771 | } | |
3772 | return rc; | |
6d3dc07c CS |
3773 | } |
3774 | ||
e114e473 | 3775 | /** |
251a2a95 | 3776 | * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack |
e114e473 | 3777 | * @sap: netlabel secattr |
272cd7a8 | 3778 | * @ssp: socket security information |
e114e473 | 3779 | * |
2f823ff8 | 3780 | * Returns a pointer to a Smack label entry found on the label list. |
e114e473 | 3781 | */ |
2f823ff8 CS |
3782 | static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, |
3783 | struct socket_smack *ssp) | |
e114e473 | 3784 | { |
2f823ff8 | 3785 | struct smack_known *skp; |
f7112e6c | 3786 | int found = 0; |
677264e8 CS |
3787 | int acat; |
3788 | int kcat; | |
e114e473 | 3789 | |
6d3dc07c | 3790 | if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { |
e114e473 | 3791 | /* |
6d3dc07c | 3792 | * Looks like a CIPSO packet. |
e114e473 CS |
3793 | * If there are flags but no level netlabel isn't |
3794 | * behaving the way we expect it to. | |
3795 | * | |
f7112e6c | 3796 | * Look it up in the label table |
e114e473 CS |
3797 | * Without guidance regarding the smack value |
3798 | * for the packet fall back on the network | |
3799 | * ambient value. | |
3800 | */ | |
f7112e6c | 3801 | rcu_read_lock(); |
348dc288 | 3802 | list_for_each_entry_rcu(skp, &smack_known_list, list) { |
2f823ff8 | 3803 | if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) |
f7112e6c | 3804 | continue; |
677264e8 CS |
3805 | /* |
3806 | * Compare the catsets. Use the netlbl APIs. | |
3807 | */ | |
3808 | if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { | |
3809 | if ((skp->smk_netlabel.flags & | |
3810 | NETLBL_SECATTR_MLS_CAT) == 0) | |
3811 | found = 1; | |
3812 | break; | |
3813 | } | |
3814 | for (acat = -1, kcat = -1; acat == kcat; ) { | |
4fbe63d1 PM |
3815 | acat = netlbl_catmap_walk(sap->attr.mls.cat, |
3816 | acat + 1); | |
3817 | kcat = netlbl_catmap_walk( | |
677264e8 CS |
3818 | skp->smk_netlabel.attr.mls.cat, |
3819 | kcat + 1); | |
3820 | if (acat < 0 || kcat < 0) | |
3821 | break; | |
3822 | } | |
3823 | if (acat == kcat) { | |
3824 | found = 1; | |
3825 | break; | |
3826 | } | |
6d3dc07c | 3827 | } |
f7112e6c CS |
3828 | rcu_read_unlock(); |
3829 | ||
3830 | if (found) | |
2f823ff8 | 3831 | return skp; |
f7112e6c | 3832 | |
54e70ec5 | 3833 | if (ssp != NULL && ssp->smk_in == &smack_known_star) |
2f823ff8 CS |
3834 | return &smack_known_web; |
3835 | return &smack_known_star; | |
e114e473 | 3836 | } |
152f91d4 | 3837 | if ((sap->flags & NETLBL_SECATTR_SECID) != 0) |
6d3dc07c CS |
3838 | /* |
3839 | * Looks like a fallback, which gives us a secid. | |
3840 | */ | |
152f91d4 | 3841 | return smack_from_secid(sap->attr.secid); |
e114e473 | 3842 | /* |
6d3dc07c CS |
3843 | * Without guidance regarding the smack value |
3844 | * for the packet fall back on the network | |
3845 | * ambient value. | |
e114e473 | 3846 | */ |
272cd7a8 | 3847 | return smack_net_ambient; |
e114e473 CS |
3848 | } |
3849 | ||
69f287ae | 3850 | #if IS_ENABLED(CONFIG_IPV6) |
6ea06247 | 3851 | static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) |
c6739443 | 3852 | { |
c6739443 CS |
3853 | u8 nexthdr; |
3854 | int offset; | |
3855 | int proto = -EINVAL; | |
3856 | struct ipv6hdr _ipv6h; | |
3857 | struct ipv6hdr *ip6; | |
3858 | __be16 frag_off; | |
3859 | struct tcphdr _tcph, *th; | |
3860 | struct udphdr _udph, *uh; | |
3861 | struct dccp_hdr _dccph, *dh; | |
3862 | ||
3863 | sip->sin6_port = 0; | |
3864 | ||
3865 | offset = skb_network_offset(skb); | |
3866 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3867 | if (ip6 == NULL) | |
3868 | return -EINVAL; | |
3869 | sip->sin6_addr = ip6->saddr; | |
3870 | ||
3871 | nexthdr = ip6->nexthdr; | |
3872 | offset += sizeof(_ipv6h); | |
3873 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); | |
3874 | if (offset < 0) | |
3875 | return -EINVAL; | |
3876 | ||
3877 | proto = nexthdr; | |
3878 | switch (proto) { | |
3879 | case IPPROTO_TCP: | |
3880 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3881 | if (th != NULL) | |
3882 | sip->sin6_port = th->source; | |
3883 | break; | |
3884 | case IPPROTO_UDP: | |
a07ef951 | 3885 | case IPPROTO_UDPLITE: |
c6739443 CS |
3886 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
3887 | if (uh != NULL) | |
3888 | sip->sin6_port = uh->source; | |
3889 | break; | |
3890 | case IPPROTO_DCCP: | |
3891 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3892 | if (dh != NULL) | |
3893 | sip->sin6_port = dh->dccph_sport; | |
3894 | break; | |
3895 | } | |
3896 | return proto; | |
3897 | } | |
69f287ae | 3898 | #endif /* CONFIG_IPV6 */ |
c6739443 | 3899 | |
e114e473 CS |
3900 | /** |
3901 | * smack_socket_sock_rcv_skb - Smack packet delivery access check | |
3902 | * @sk: socket | |
3903 | * @skb: packet | |
3904 | * | |
3905 | * Returns 0 if the packet should be delivered, an error code otherwise | |
3906 | */ | |
3907 | static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
3908 | { | |
3909 | struct netlbl_lsm_secattr secattr; | |
3910 | struct socket_smack *ssp = sk->sk_security; | |
69f287ae | 3911 | struct smack_known *skp = NULL; |
c6739443 | 3912 | int rc = 0; |
ecfcc53f | 3913 | struct smk_audit_info ad; |
129a9989 | 3914 | u16 family = sk->sk_family; |
923e9a13 | 3915 | #ifdef CONFIG_AUDIT |
48c62af6 | 3916 | struct lsm_network_audit net; |
923e9a13 | 3917 | #endif |
69f287ae CS |
3918 | #if IS_ENABLED(CONFIG_IPV6) |
3919 | struct sockaddr_in6 sadd; | |
3920 | int proto; | |
129a9989 PS |
3921 | |
3922 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
3923 | family = PF_INET; | |
69f287ae CS |
3924 | #endif /* CONFIG_IPV6 */ |
3925 | ||
129a9989 | 3926 | switch (family) { |
c6739443 | 3927 | case PF_INET: |
69f287ae CS |
3928 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3929 | /* | |
3930 | * If there is a secmark use it rather than the CIPSO label. | |
3931 | * If there is no secmark fall back to CIPSO. | |
3932 | * The secmark is assumed to reflect policy better. | |
3933 | */ | |
3934 | if (skb && skb->secmark != 0) { | |
3935 | skp = smack_from_secid(skb->secmark); | |
3936 | goto access_check; | |
3937 | } | |
3938 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
c6739443 CS |
3939 | /* |
3940 | * Translate what netlabel gave us. | |
3941 | */ | |
3942 | netlbl_secattr_init(&secattr); | |
6d3dc07c | 3943 | |
129a9989 | 3944 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
c6739443 | 3945 | if (rc == 0) |
2f823ff8 | 3946 | skp = smack_from_secattr(&secattr, ssp); |
c6739443 | 3947 | else |
2f823ff8 | 3948 | skp = smack_net_ambient; |
6d3dc07c | 3949 | |
c6739443 | 3950 | netlbl_secattr_destroy(&secattr); |
6d3dc07c | 3951 | |
69f287ae CS |
3952 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
3953 | access_check: | |
3954 | #endif | |
ecfcc53f | 3955 | #ifdef CONFIG_AUDIT |
c6739443 | 3956 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
129a9989 | 3957 | ad.a.u.net->family = family; |
c6739443 CS |
3958 | ad.a.u.net->netif = skb->skb_iif; |
3959 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); | |
ecfcc53f | 3960 | #endif |
c6739443 CS |
3961 | /* |
3962 | * Receiving a packet requires that the other end | |
3963 | * be able to write here. Read access is not required. | |
3964 | * This is the simplist possible security model | |
3965 | * for networking. | |
3966 | */ | |
21c7eae2 LP |
3967 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
3968 | rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in, | |
d166c802 | 3969 | MAY_WRITE, rc); |
c6739443 | 3970 | if (rc != 0) |
129a9989 | 3971 | netlbl_skbuff_err(skb, family, rc, 0); |
c6739443 | 3972 | break; |
69f287ae | 3973 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 | 3974 | case PF_INET6: |
69f287ae | 3975 | proto = smk_skb_to_addr_ipv6(skb, &sadd); |
a07ef951 PS |
3976 | if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE && |
3977 | proto != IPPROTO_TCP && proto != IPPROTO_DCCP) | |
69f287ae | 3978 | break; |
21abb1ec | 3979 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae CS |
3980 | if (skb && skb->secmark != 0) |
3981 | skp = smack_from_secid(skb->secmark); | |
c6739443 | 3982 | else |
21abb1ec CS |
3983 | skp = smack_ipv6host_label(&sadd); |
3984 | if (skp == NULL) | |
69f287ae CS |
3985 | skp = smack_net_ambient; |
3986 | #ifdef CONFIG_AUDIT | |
3987 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); | |
129a9989 | 3988 | ad.a.u.net->family = family; |
69f287ae CS |
3989 | ad.a.u.net->netif = skb->skb_iif; |
3990 | ipv6_skb_to_auditdata(skb, &ad.a, NULL); | |
3991 | #endif /* CONFIG_AUDIT */ | |
3992 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); | |
3993 | rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in, | |
3994 | MAY_WRITE, rc); | |
21abb1ec CS |
3995 | #endif /* SMACK_IPV6_SECMARK_LABELING */ |
3996 | #ifdef SMACK_IPV6_PORT_LABELING | |
69f287ae | 3997 | rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); |
21abb1ec | 3998 | #endif /* SMACK_IPV6_PORT_LABELING */ |
d66a8acb PS |
3999 | if (rc != 0) |
4000 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, | |
4001 | ICMPV6_ADM_PROHIBITED, 0); | |
c6739443 | 4002 | break; |
69f287ae | 4003 | #endif /* CONFIG_IPV6 */ |
c6739443 | 4004 | } |
69f287ae | 4005 | |
a8134296 | 4006 | return rc; |
e114e473 CS |
4007 | } |
4008 | ||
4009 | /** | |
4010 | * smack_socket_getpeersec_stream - pull in packet label | |
4011 | * @sock: the socket | |
4012 | * @optval: user's destination | |
4013 | * @optlen: size thereof | |
251a2a95 | 4014 | * @len: max thereof |
e114e473 CS |
4015 | * |
4016 | * returns zero on success, an error code otherwise | |
4017 | */ | |
4018 | static int smack_socket_getpeersec_stream(struct socket *sock, | |
4019 | char __user *optval, | |
4020 | int __user *optlen, unsigned len) | |
4021 | { | |
4022 | struct socket_smack *ssp; | |
272cd7a8 CS |
4023 | char *rcp = ""; |
4024 | int slen = 1; | |
e114e473 CS |
4025 | int rc = 0; |
4026 | ||
4027 | ssp = sock->sk->sk_security; | |
272cd7a8 | 4028 | if (ssp->smk_packet != NULL) { |
54e70ec5 | 4029 | rcp = ssp->smk_packet->smk_known; |
272cd7a8 CS |
4030 | slen = strlen(rcp) + 1; |
4031 | } | |
e114e473 CS |
4032 | |
4033 | if (slen > len) | |
4034 | rc = -ERANGE; | |
272cd7a8 | 4035 | else if (copy_to_user(optval, rcp, slen) != 0) |
e114e473 CS |
4036 | rc = -EFAULT; |
4037 | ||
4038 | if (put_user(slen, optlen) != 0) | |
4039 | rc = -EFAULT; | |
4040 | ||
4041 | return rc; | |
4042 | } | |
4043 | ||
4044 | ||
4045 | /** | |
4046 | * smack_socket_getpeersec_dgram - pull in packet label | |
b4e0d5f0 | 4047 | * @sock: the peer socket |
e114e473 CS |
4048 | * @skb: packet data |
4049 | * @secid: pointer to where to put the secid of the packet | |
4050 | * | |
4051 | * Sets the netlabel socket state on sk from parent | |
4052 | */ | |
4053 | static int smack_socket_getpeersec_dgram(struct socket *sock, | |
4054 | struct sk_buff *skb, u32 *secid) | |
4055 | ||
4056 | { | |
4057 | struct netlbl_lsm_secattr secattr; | |
272cd7a8 | 4058 | struct socket_smack *ssp = NULL; |
2f823ff8 | 4059 | struct smack_known *skp; |
b4e0d5f0 CS |
4060 | int family = PF_UNSPEC; |
4061 | u32 s = 0; /* 0 is the invalid secid */ | |
e114e473 CS |
4062 | int rc; |
4063 | ||
b4e0d5f0 CS |
4064 | if (skb != NULL) { |
4065 | if (skb->protocol == htons(ETH_P_IP)) | |
4066 | family = PF_INET; | |
69f287ae | 4067 | #if IS_ENABLED(CONFIG_IPV6) |
b4e0d5f0 CS |
4068 | else if (skb->protocol == htons(ETH_P_IPV6)) |
4069 | family = PF_INET6; | |
69f287ae | 4070 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4071 | } |
b4e0d5f0 CS |
4072 | if (family == PF_UNSPEC && sock != NULL) |
4073 | family = sock->sk->sk_family; | |
e114e473 | 4074 | |
69f287ae CS |
4075 | switch (family) { |
4076 | case PF_UNIX: | |
272cd7a8 | 4077 | ssp = sock->sk->sk_security; |
2f823ff8 | 4078 | s = ssp->smk_out->smk_secid; |
69f287ae CS |
4079 | break; |
4080 | case PF_INET: | |
4081 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4082 | s = skb->secmark; | |
4083 | if (s != 0) | |
4084 | break; | |
4085 | #endif | |
b4e0d5f0 CS |
4086 | /* |
4087 | * Translate what netlabel gave us. | |
4088 | */ | |
272cd7a8 CS |
4089 | if (sock != NULL && sock->sk != NULL) |
4090 | ssp = sock->sk->sk_security; | |
b4e0d5f0 CS |
4091 | netlbl_secattr_init(&secattr); |
4092 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
4093 | if (rc == 0) { | |
2f823ff8 CS |
4094 | skp = smack_from_secattr(&secattr, ssp); |
4095 | s = skp->smk_secid; | |
b4e0d5f0 CS |
4096 | } |
4097 | netlbl_secattr_destroy(&secattr); | |
69f287ae | 4098 | break; |
69f287ae | 4099 | case PF_INET6: |
21abb1ec | 4100 | #ifdef SMACK_IPV6_SECMARK_LABELING |
69f287ae | 4101 | s = skb->secmark; |
21abb1ec | 4102 | #endif |
69f287ae | 4103 | break; |
b4e0d5f0 CS |
4104 | } |
4105 | *secid = s; | |
e114e473 CS |
4106 | if (s == 0) |
4107 | return -EINVAL; | |
e114e473 CS |
4108 | return 0; |
4109 | } | |
4110 | ||
4111 | /** | |
07feee8f PM |
4112 | * smack_sock_graft - Initialize a newly created socket with an existing sock |
4113 | * @sk: child sock | |
4114 | * @parent: parent socket | |
e114e473 | 4115 | * |
07feee8f PM |
4116 | * Set the smk_{in,out} state of an existing sock based on the process that |
4117 | * is creating the new socket. | |
e114e473 CS |
4118 | */ |
4119 | static void smack_sock_graft(struct sock *sk, struct socket *parent) | |
4120 | { | |
4121 | struct socket_smack *ssp; | |
2f823ff8 | 4122 | struct smack_known *skp = smk_of_current(); |
e114e473 | 4123 | |
07feee8f PM |
4124 | if (sk == NULL || |
4125 | (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) | |
e114e473 CS |
4126 | return; |
4127 | ||
4128 | ssp = sk->sk_security; | |
54e70ec5 | 4129 | ssp->smk_in = skp; |
2f823ff8 | 4130 | ssp->smk_out = skp; |
07feee8f | 4131 | /* cssp->smk_packet is already set in smack_inet_csk_clone() */ |
e114e473 CS |
4132 | } |
4133 | ||
4134 | /** | |
4135 | * smack_inet_conn_request - Smack access check on connect | |
4136 | * @sk: socket involved | |
4137 | * @skb: packet | |
4138 | * @req: unused | |
4139 | * | |
4140 | * Returns 0 if a task with the packet label could write to | |
4141 | * the socket, otherwise an error code | |
4142 | */ | |
4143 | static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
4144 | struct request_sock *req) | |
4145 | { | |
07feee8f | 4146 | u16 family = sk->sk_family; |
f7112e6c | 4147 | struct smack_known *skp; |
e114e473 | 4148 | struct socket_smack *ssp = sk->sk_security; |
07feee8f PM |
4149 | struct netlbl_lsm_secattr secattr; |
4150 | struct sockaddr_in addr; | |
4151 | struct iphdr *hdr; | |
21c7eae2 | 4152 | struct smack_known *hskp; |
e114e473 | 4153 | int rc; |
ecfcc53f | 4154 | struct smk_audit_info ad; |
923e9a13 | 4155 | #ifdef CONFIG_AUDIT |
48c62af6 | 4156 | struct lsm_network_audit net; |
923e9a13 | 4157 | #endif |
e114e473 | 4158 | |
69f287ae | 4159 | #if IS_ENABLED(CONFIG_IPV6) |
c6739443 CS |
4160 | if (family == PF_INET6) { |
4161 | /* | |
4162 | * Handle mapped IPv4 packets arriving | |
4163 | * via IPv6 sockets. Don't set up netlabel | |
4164 | * processing on IPv6. | |
4165 | */ | |
4166 | if (skb->protocol == htons(ETH_P_IP)) | |
4167 | family = PF_INET; | |
4168 | else | |
4169 | return 0; | |
4170 | } | |
69f287ae | 4171 | #endif /* CONFIG_IPV6 */ |
e114e473 | 4172 | |
7f368ad3 CS |
4173 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4174 | /* | |
4175 | * If there is a secmark use it rather than the CIPSO label. | |
4176 | * If there is no secmark fall back to CIPSO. | |
4177 | * The secmark is assumed to reflect policy better. | |
4178 | */ | |
4179 | if (skb && skb->secmark != 0) { | |
4180 | skp = smack_from_secid(skb->secmark); | |
4181 | goto access_check; | |
4182 | } | |
4183 | #endif /* CONFIG_SECURITY_SMACK_NETFILTER */ | |
4184 | ||
07feee8f PM |
4185 | netlbl_secattr_init(&secattr); |
4186 | rc = netlbl_skbuff_getattr(skb, family, &secattr); | |
e114e473 | 4187 | if (rc == 0) |
2f823ff8 | 4188 | skp = smack_from_secattr(&secattr, ssp); |
e114e473 | 4189 | else |
2f823ff8 | 4190 | skp = &smack_known_huh; |
07feee8f PM |
4191 | netlbl_secattr_destroy(&secattr); |
4192 | ||
7f368ad3 CS |
4193 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER |
4194 | access_check: | |
4195 | #endif | |
4196 | ||
ecfcc53f | 4197 | #ifdef CONFIG_AUDIT |
48c62af6 EP |
4198 | smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); |
4199 | ad.a.u.net->family = family; | |
4200 | ad.a.u.net->netif = skb->skb_iif; | |
ecfcc53f EB |
4201 | ipv4_skb_to_auditdata(skb, &ad.a, NULL); |
4202 | #endif | |
e114e473 | 4203 | /* |
07feee8f PM |
4204 | * Receiving a packet requires that the other end be able to write |
4205 | * here. Read access is not required. | |
e114e473 | 4206 | */ |
21c7eae2 LP |
4207 | rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); |
4208 | rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc); | |
07feee8f PM |
4209 | if (rc != 0) |
4210 | return rc; | |
4211 | ||
4212 | /* | |
4213 | * Save the peer's label in the request_sock so we can later setup | |
4214 | * smk_packet in the child socket so that SO_PEERCRED can report it. | |
4215 | */ | |
2f823ff8 | 4216 | req->peer_secid = skp->smk_secid; |
07feee8f PM |
4217 | |
4218 | /* | |
4219 | * We need to decide if we want to label the incoming connection here | |
4220 | * if we do we only need to label the request_sock and the stack will | |
25985edc | 4221 | * propagate the wire-label to the sock when it is created. |
07feee8f PM |
4222 | */ |
4223 | hdr = ip_hdr(skb); | |
4224 | addr.sin_addr.s_addr = hdr->saddr; | |
4225 | rcu_read_lock(); | |
21abb1ec | 4226 | hskp = smack_ipv4host_label(&addr); |
f7112e6c CS |
4227 | rcu_read_unlock(); |
4228 | ||
21c7eae2 | 4229 | if (hskp == NULL) |
f7112e6c | 4230 | rc = netlbl_req_setattr(req, &skp->smk_netlabel); |
2f823ff8 | 4231 | else |
07feee8f | 4232 | netlbl_req_delattr(req); |
e114e473 CS |
4233 | |
4234 | return rc; | |
4235 | } | |
4236 | ||
07feee8f PM |
4237 | /** |
4238 | * smack_inet_csk_clone - Copy the connection information to the new socket | |
4239 | * @sk: the new socket | |
4240 | * @req: the connection's request_sock | |
4241 | * | |
4242 | * Transfer the connection's peer label to the newly created socket. | |
4243 | */ | |
4244 | static void smack_inet_csk_clone(struct sock *sk, | |
4245 | const struct request_sock *req) | |
4246 | { | |
4247 | struct socket_smack *ssp = sk->sk_security; | |
2f823ff8 | 4248 | struct smack_known *skp; |
07feee8f | 4249 | |
2f823ff8 CS |
4250 | if (req->peer_secid != 0) { |
4251 | skp = smack_from_secid(req->peer_secid); | |
54e70ec5 | 4252 | ssp->smk_packet = skp; |
2f823ff8 | 4253 | } else |
272cd7a8 | 4254 | ssp->smk_packet = NULL; |
07feee8f PM |
4255 | } |
4256 | ||
e114e473 CS |
4257 | /* |
4258 | * Key management security hooks | |
4259 | * | |
4260 | * Casey has not tested key support very heavily. | |
4261 | * The permission check is most likely too restrictive. | |
4262 | * If you care about keys please have a look. | |
4263 | */ | |
4264 | #ifdef CONFIG_KEYS | |
4265 | ||
4266 | /** | |
4267 | * smack_key_alloc - Set the key security blob | |
4268 | * @key: object | |
d84f4f99 | 4269 | * @cred: the credentials to use |
e114e473 CS |
4270 | * @flags: unused |
4271 | * | |
4272 | * No allocation required | |
4273 | * | |
4274 | * Returns 0 | |
4275 | */ | |
d84f4f99 | 4276 | static int smack_key_alloc(struct key *key, const struct cred *cred, |
e114e473 CS |
4277 | unsigned long flags) |
4278 | { | |
2f823ff8 CS |
4279 | struct smack_known *skp = smk_of_task(cred->security); |
4280 | ||
21c7eae2 | 4281 | key->security = skp; |
e114e473 CS |
4282 | return 0; |
4283 | } | |
4284 | ||
4285 | /** | |
4286 | * smack_key_free - Clear the key security blob | |
4287 | * @key: the object | |
4288 | * | |
4289 | * Clear the blob pointer | |
4290 | */ | |
4291 | static void smack_key_free(struct key *key) | |
4292 | { | |
4293 | key->security = NULL; | |
4294 | } | |
4295 | ||
1a28979b | 4296 | /** |
e114e473 CS |
4297 | * smack_key_permission - Smack access on a key |
4298 | * @key_ref: gets to the object | |
d84f4f99 | 4299 | * @cred: the credentials to use |
1a28979b | 4300 | * @perm: requested key permissions |
e114e473 CS |
4301 | * |
4302 | * Return 0 if the task has read and write to the object, | |
4303 | * an error code otherwise | |
4304 | */ | |
4305 | static int smack_key_permission(key_ref_t key_ref, | |
f5895943 | 4306 | const struct cred *cred, unsigned perm) |
e114e473 CS |
4307 | { |
4308 | struct key *keyp; | |
ecfcc53f | 4309 | struct smk_audit_info ad; |
2f823ff8 | 4310 | struct smack_known *tkp = smk_of_task(cred->security); |
fffea214 | 4311 | int request = 0; |
d166c802 | 4312 | int rc; |
e114e473 CS |
4313 | |
4314 | keyp = key_ref_to_ptr(key_ref); | |
4315 | if (keyp == NULL) | |
4316 | return -EINVAL; | |
4317 | /* | |
4318 | * If the key hasn't been initialized give it access so that | |
4319 | * it may do so. | |
4320 | */ | |
4321 | if (keyp->security == NULL) | |
4322 | return 0; | |
4323 | /* | |
4324 | * This should not occur | |
4325 | */ | |
2f823ff8 | 4326 | if (tkp == NULL) |
e114e473 | 4327 | return -EACCES; |
d19dfe58 CS |
4328 | |
4329 | if (smack_privileged_cred(CAP_MAC_OVERRIDE, cred)) | |
4330 | return 0; | |
4331 | ||
ecfcc53f EB |
4332 | #ifdef CONFIG_AUDIT |
4333 | smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); | |
4334 | ad.a.u.key_struct.key = keyp->serial; | |
4335 | ad.a.u.key_struct.key_desc = keyp->description; | |
4336 | #endif | |
fffea214 DK |
4337 | if (perm & KEY_NEED_READ) |
4338 | request = MAY_READ; | |
4339 | if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) | |
4340 | request = MAY_WRITE; | |
d166c802 CS |
4341 | rc = smk_access(tkp, keyp->security, request, &ad); |
4342 | rc = smk_bu_note("key access", tkp, keyp->security, request, rc); | |
4343 | return rc; | |
e114e473 | 4344 | } |
7fc5f36e JB |
4345 | |
4346 | /* | |
4347 | * smack_key_getsecurity - Smack label tagging the key | |
4348 | * @key points to the key to be queried | |
4349 | * @_buffer points to a pointer that should be set to point to the | |
4350 | * resulting string (if no label or an error occurs). | |
4351 | * Return the length of the string (including terminating NUL) or -ve if | |
4352 | * an error. | |
4353 | * May also return 0 (and a NULL buffer pointer) if there is no label. | |
4354 | */ | |
4355 | static int smack_key_getsecurity(struct key *key, char **_buffer) | |
4356 | { | |
4357 | struct smack_known *skp = key->security; | |
4358 | size_t length; | |
4359 | char *copy; | |
4360 | ||
4361 | if (key->security == NULL) { | |
4362 | *_buffer = NULL; | |
4363 | return 0; | |
4364 | } | |
4365 | ||
4366 | copy = kstrdup(skp->smk_known, GFP_KERNEL); | |
4367 | if (copy == NULL) | |
4368 | return -ENOMEM; | |
4369 | length = strlen(copy) + 1; | |
4370 | ||
4371 | *_buffer = copy; | |
4372 | return length; | |
4373 | } | |
4374 | ||
e114e473 CS |
4375 | #endif /* CONFIG_KEYS */ |
4376 | ||
d20bdda6 AD |
4377 | /* |
4378 | * Smack Audit hooks | |
4379 | * | |
4380 | * Audit requires a unique representation of each Smack specific | |
4381 | * rule. This unique representation is used to distinguish the | |
4382 | * object to be audited from remaining kernel objects and also | |
4383 | * works as a glue between the audit hooks. | |
4384 | * | |
4385 | * Since repository entries are added but never deleted, we'll use | |
4386 | * the smack_known label address related to the given audit rule as | |
4387 | * the needed unique representation. This also better fits the smack | |
4388 | * model where nearly everything is a label. | |
4389 | */ | |
4390 | #ifdef CONFIG_AUDIT | |
4391 | ||
4392 | /** | |
4393 | * smack_audit_rule_init - Initialize a smack audit rule | |
4394 | * @field: audit rule fields given from user-space (audit.h) | |
4395 | * @op: required testing operator (=, !=, >, <, ...) | |
4396 | * @rulestr: smack label to be audited | |
4397 | * @vrule: pointer to save our own audit rule representation | |
4398 | * | |
4399 | * Prepare to audit cases where (@field @op @rulestr) is true. | |
4400 | * The label to be audited is created if necessay. | |
4401 | */ | |
4402 | static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) | |
4403 | { | |
21c7eae2 | 4404 | struct smack_known *skp; |
d20bdda6 AD |
4405 | char **rule = (char **)vrule; |
4406 | *rule = NULL; | |
4407 | ||
4408 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4409 | return -EINVAL; | |
4410 | ||
5af75d8d | 4411 | if (op != Audit_equal && op != Audit_not_equal) |
d20bdda6 AD |
4412 | return -EINVAL; |
4413 | ||
21c7eae2 | 4414 | skp = smk_import_entry(rulestr, 0); |
e774ad68 LP |
4415 | if (IS_ERR(skp)) |
4416 | return PTR_ERR(skp); | |
4417 | ||
4418 | *rule = skp->smk_known; | |
d20bdda6 AD |
4419 | |
4420 | return 0; | |
4421 | } | |
4422 | ||
4423 | /** | |
4424 | * smack_audit_rule_known - Distinguish Smack audit rules | |
4425 | * @krule: rule of interest, in Audit kernel representation format | |
4426 | * | |
4427 | * This is used to filter Smack rules from remaining Audit ones. | |
4428 | * If it's proved that this rule belongs to us, the | |
4429 | * audit_rule_match hook will be called to do the final judgement. | |
4430 | */ | |
4431 | static int smack_audit_rule_known(struct audit_krule *krule) | |
4432 | { | |
4433 | struct audit_field *f; | |
4434 | int i; | |
4435 | ||
4436 | for (i = 0; i < krule->field_count; i++) { | |
4437 | f = &krule->fields[i]; | |
4438 | ||
4439 | if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) | |
4440 | return 1; | |
4441 | } | |
4442 | ||
4443 | return 0; | |
4444 | } | |
4445 | ||
4446 | /** | |
4447 | * smack_audit_rule_match - Audit given object ? | |
4448 | * @secid: security id for identifying the object to test | |
4449 | * @field: audit rule flags given from user-space | |
4450 | * @op: required testing operator | |
4451 | * @vrule: smack internal rule presentation | |
4452 | * @actx: audit context associated with the check | |
4453 | * | |
4454 | * The core Audit hook. It's used to take the decision of | |
4455 | * whether to audit or not to audit a given object. | |
4456 | */ | |
4457 | static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, | |
4458 | struct audit_context *actx) | |
4459 | { | |
2f823ff8 | 4460 | struct smack_known *skp; |
d20bdda6 AD |
4461 | char *rule = vrule; |
4462 | ||
4eb0f4ab RGB |
4463 | if (unlikely(!rule)) { |
4464 | WARN_ONCE(1, "Smack: missing rule\n"); | |
d20bdda6 AD |
4465 | return -ENOENT; |
4466 | } | |
4467 | ||
4468 | if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) | |
4469 | return 0; | |
4470 | ||
2f823ff8 | 4471 | skp = smack_from_secid(secid); |
d20bdda6 AD |
4472 | |
4473 | /* | |
4474 | * No need to do string comparisons. If a match occurs, | |
4475 | * both pointers will point to the same smack_known | |
4476 | * label. | |
4477 | */ | |
5af75d8d | 4478 | if (op == Audit_equal) |
2f823ff8 | 4479 | return (rule == skp->smk_known); |
5af75d8d | 4480 | if (op == Audit_not_equal) |
2f823ff8 | 4481 | return (rule != skp->smk_known); |
d20bdda6 AD |
4482 | |
4483 | return 0; | |
4484 | } | |
4485 | ||
491a0b08 CS |
4486 | /* |
4487 | * There is no need for a smack_audit_rule_free hook. | |
d20bdda6 AD |
4488 | * No memory was allocated. |
4489 | */ | |
d20bdda6 AD |
4490 | |
4491 | #endif /* CONFIG_AUDIT */ | |
4492 | ||
746df9b5 DQ |
4493 | /** |
4494 | * smack_ismaclabel - check if xattr @name references a smack MAC label | |
4495 | * @name: Full xattr name to check. | |
4496 | */ | |
4497 | static int smack_ismaclabel(const char *name) | |
4498 | { | |
4499 | return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); | |
4500 | } | |
4501 | ||
4502 | ||
251a2a95 | 4503 | /** |
e114e473 CS |
4504 | * smack_secid_to_secctx - return the smack label for a secid |
4505 | * @secid: incoming integer | |
4506 | * @secdata: destination | |
4507 | * @seclen: how long it is | |
4508 | * | |
4509 | * Exists for networking code. | |
4510 | */ | |
4511 | static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
4512 | { | |
2f823ff8 | 4513 | struct smack_known *skp = smack_from_secid(secid); |
e114e473 | 4514 | |
d5630b9d | 4515 | if (secdata) |
2f823ff8 CS |
4516 | *secdata = skp->smk_known; |
4517 | *seclen = strlen(skp->smk_known); | |
e114e473 CS |
4518 | return 0; |
4519 | } | |
4520 | ||
251a2a95 | 4521 | /** |
4bc87e62 CS |
4522 | * smack_secctx_to_secid - return the secid for a smack label |
4523 | * @secdata: smack label | |
4524 | * @seclen: how long result is | |
4525 | * @secid: outgoing integer | |
4526 | * | |
4527 | * Exists for audit and networking code. | |
4528 | */ | |
e52c1764 | 4529 | static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
4bc87e62 | 4530 | { |
21c7eae2 LP |
4531 | struct smack_known *skp = smk_find_entry(secdata); |
4532 | ||
4533 | if (skp) | |
4534 | *secid = skp->smk_secid; | |
4535 | else | |
4536 | *secid = 0; | |
4bc87e62 CS |
4537 | return 0; |
4538 | } | |
4539 | ||
491a0b08 CS |
4540 | /* |
4541 | * There used to be a smack_release_secctx hook | |
4542 | * that did nothing back when hooks were in a vector. | |
4543 | * Now that there's a list such a hook adds cost. | |
e114e473 | 4544 | */ |
e114e473 | 4545 | |
1ee65e37 DQ |
4546 | static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
4547 | { | |
4548 | return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); | |
4549 | } | |
4550 | ||
4551 | static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
4552 | { | |
4553 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); | |
4554 | } | |
4555 | ||
4556 | static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
4557 | { | |
0f8983cf | 4558 | struct smack_known *skp = smk_of_inode(inode); |
1ee65e37 | 4559 | |
0f8983cf CS |
4560 | *ctx = skp->smk_known; |
4561 | *ctxlen = strlen(skp->smk_known); | |
1ee65e37 DQ |
4562 | return 0; |
4563 | } | |
4564 | ||
d6d80cb5 CS |
4565 | static int smack_inode_copy_up(struct dentry *dentry, struct cred **new) |
4566 | { | |
4567 | ||
4568 | struct task_smack *tsp; | |
4569 | struct smack_known *skp; | |
4570 | struct inode_smack *isp; | |
4571 | struct cred *new_creds = *new; | |
4572 | ||
4573 | if (new_creds == NULL) { | |
4574 | new_creds = prepare_creds(); | |
4575 | if (new_creds == NULL) | |
4576 | return -ENOMEM; | |
4577 | } | |
4578 | ||
4579 | tsp = new_creds->security; | |
4580 | ||
4581 | /* | |
4582 | * Get label from overlay inode and set it in create_sid | |
4583 | */ | |
4584 | isp = d_inode(dentry->d_parent)->i_security; | |
4585 | skp = isp->smk_inode; | |
4586 | tsp->smk_task = skp; | |
4587 | *new = new_creds; | |
4588 | return 0; | |
4589 | } | |
4590 | ||
4591 | static int smack_inode_copy_up_xattr(const char *name) | |
4592 | { | |
4593 | /* | |
4594 | * Return 1 if this is the smack access Smack attribute. | |
4595 | */ | |
4596 | if (strcmp(name, XATTR_NAME_SMACK) == 0) | |
4597 | return 1; | |
4598 | ||
4599 | return -EOPNOTSUPP; | |
4600 | } | |
4601 | ||
4602 | static int smack_dentry_create_files_as(struct dentry *dentry, int mode, | |
4603 | struct qstr *name, | |
4604 | const struct cred *old, | |
4605 | struct cred *new) | |
4606 | { | |
4607 | struct task_smack *otsp = old->security; | |
4608 | struct task_smack *ntsp = new->security; | |
4609 | struct inode_smack *isp; | |
4610 | int may; | |
4611 | ||
4612 | /* | |
4613 | * Use the process credential unless all of | |
4614 | * the transmuting criteria are met | |
4615 | */ | |
4616 | ntsp->smk_task = otsp->smk_task; | |
4617 | ||
4618 | /* | |
4619 | * the attribute of the containing directory | |
4620 | */ | |
4621 | isp = d_inode(dentry->d_parent)->i_security; | |
4622 | ||
4623 | if (isp->smk_flags & SMK_INODE_TRANSMUTE) { | |
4624 | rcu_read_lock(); | |
4625 | may = smk_access_entry(otsp->smk_task->smk_known, | |
4626 | isp->smk_inode->smk_known, | |
4627 | &otsp->smk_task->smk_rules); | |
4628 | rcu_read_unlock(); | |
4629 | ||
4630 | /* | |
4631 | * If the directory is transmuting and the rule | |
4632 | * providing access is transmuting use the containing | |
4633 | * directory label instead of the process label. | |
4634 | */ | |
4635 | if (may > 0 && (may & MAY_TRANSMUTE)) | |
4636 | ntsp->smk_task = isp->smk_inode; | |
4637 | } | |
4638 | return 0; | |
4639 | } | |
4640 | ||
ca97d939 | 4641 | static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
4642 | LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), |
4643 | LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), | |
4644 | LSM_HOOK_INIT(syslog, smack_syslog), | |
4645 | ||
4646 | LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security), | |
4647 | LSM_HOOK_INIT(sb_free_security, smack_sb_free_security), | |
204cc0cc | 4648 | LSM_HOOK_INIT(sb_free_mnt_opts, smack_free_mnt_opts), |
5b400239 | 4649 | LSM_HOOK_INIT(sb_eat_lsm_opts, smack_sb_eat_lsm_opts), |
e20b043a | 4650 | LSM_HOOK_INIT(sb_statfs, smack_sb_statfs), |
3bf2789c | 4651 | LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts), |
e20b043a CS |
4652 | |
4653 | LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds), | |
e20b043a CS |
4654 | |
4655 | LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), | |
4656 | LSM_HOOK_INIT(inode_free_security, smack_inode_free_security), | |
4657 | LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), | |
4658 | LSM_HOOK_INIT(inode_link, smack_inode_link), | |
4659 | LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), | |
4660 | LSM_HOOK_INIT(inode_rmdir, smack_inode_rmdir), | |
4661 | LSM_HOOK_INIT(inode_rename, smack_inode_rename), | |
4662 | LSM_HOOK_INIT(inode_permission, smack_inode_permission), | |
4663 | LSM_HOOK_INIT(inode_setattr, smack_inode_setattr), | |
4664 | LSM_HOOK_INIT(inode_getattr, smack_inode_getattr), | |
4665 | LSM_HOOK_INIT(inode_setxattr, smack_inode_setxattr), | |
4666 | LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), | |
4667 | LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), | |
4668 | LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), | |
4669 | LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), | |
4670 | LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), | |
4671 | LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), | |
4672 | LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), | |
4673 | ||
e20b043a CS |
4674 | LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), |
4675 | LSM_HOOK_INIT(file_free_security, smack_file_free_security), | |
4676 | LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), | |
4677 | LSM_HOOK_INIT(file_lock, smack_file_lock), | |
4678 | LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), | |
4679 | LSM_HOOK_INIT(mmap_file, smack_mmap_file), | |
4680 | LSM_HOOK_INIT(mmap_addr, cap_mmap_addr), | |
4681 | LSM_HOOK_INIT(file_set_fowner, smack_file_set_fowner), | |
4682 | LSM_HOOK_INIT(file_send_sigiotask, smack_file_send_sigiotask), | |
4683 | LSM_HOOK_INIT(file_receive, smack_file_receive), | |
4684 | ||
4685 | LSM_HOOK_INIT(file_open, smack_file_open), | |
4686 | ||
4687 | LSM_HOOK_INIT(cred_alloc_blank, smack_cred_alloc_blank), | |
4688 | LSM_HOOK_INIT(cred_free, smack_cred_free), | |
4689 | LSM_HOOK_INIT(cred_prepare, smack_cred_prepare), | |
4690 | LSM_HOOK_INIT(cred_transfer, smack_cred_transfer), | |
3ec30113 | 4691 | LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid), |
e20b043a CS |
4692 | LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as), |
4693 | LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as), | |
4694 | LSM_HOOK_INIT(task_setpgid, smack_task_setpgid), | |
4695 | LSM_HOOK_INIT(task_getpgid, smack_task_getpgid), | |
4696 | LSM_HOOK_INIT(task_getsid, smack_task_getsid), | |
4697 | LSM_HOOK_INIT(task_getsecid, smack_task_getsecid), | |
4698 | LSM_HOOK_INIT(task_setnice, smack_task_setnice), | |
4699 | LSM_HOOK_INIT(task_setioprio, smack_task_setioprio), | |
4700 | LSM_HOOK_INIT(task_getioprio, smack_task_getioprio), | |
4701 | LSM_HOOK_INIT(task_setscheduler, smack_task_setscheduler), | |
4702 | LSM_HOOK_INIT(task_getscheduler, smack_task_getscheduler), | |
4703 | LSM_HOOK_INIT(task_movememory, smack_task_movememory), | |
4704 | LSM_HOOK_INIT(task_kill, smack_task_kill), | |
e20b043a CS |
4705 | LSM_HOOK_INIT(task_to_inode, smack_task_to_inode), |
4706 | ||
4707 | LSM_HOOK_INIT(ipc_permission, smack_ipc_permission), | |
4708 | LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), | |
4709 | ||
4710 | LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), | |
4711 | LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security), | |
4712 | ||
0d79cbf8 EB |
4713 | LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security), |
4714 | LSM_HOOK_INIT(msg_queue_free_security, smack_ipc_free_security), | |
e20b043a CS |
4715 | LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), |
4716 | LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), | |
4717 | LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), | |
4718 | LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), | |
4719 | ||
0d79cbf8 EB |
4720 | LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security), |
4721 | LSM_HOOK_INIT(shm_free_security, smack_ipc_free_security), | |
e20b043a CS |
4722 | LSM_HOOK_INIT(shm_associate, smack_shm_associate), |
4723 | LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), | |
4724 | LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), | |
4725 | ||
0d79cbf8 EB |
4726 | LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security), |
4727 | LSM_HOOK_INIT(sem_free_security, smack_ipc_free_security), | |
e20b043a CS |
4728 | LSM_HOOK_INIT(sem_associate, smack_sem_associate), |
4729 | LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), | |
4730 | LSM_HOOK_INIT(sem_semop, smack_sem_semop), | |
4731 | ||
4732 | LSM_HOOK_INIT(d_instantiate, smack_d_instantiate), | |
4733 | ||
4734 | LSM_HOOK_INIT(getprocattr, smack_getprocattr), | |
4735 | LSM_HOOK_INIT(setprocattr, smack_setprocattr), | |
4736 | ||
4737 | LSM_HOOK_INIT(unix_stream_connect, smack_unix_stream_connect), | |
4738 | LSM_HOOK_INIT(unix_may_send, smack_unix_may_send), | |
4739 | ||
4740 | LSM_HOOK_INIT(socket_post_create, smack_socket_post_create), | |
5859cdf5 | 4741 | LSM_HOOK_INIT(socket_socketpair, smack_socket_socketpair), |
21abb1ec | 4742 | #ifdef SMACK_IPV6_PORT_LABELING |
e20b043a | 4743 | LSM_HOOK_INIT(socket_bind, smack_socket_bind), |
21abb1ec | 4744 | #endif |
e20b043a CS |
4745 | LSM_HOOK_INIT(socket_connect, smack_socket_connect), |
4746 | LSM_HOOK_INIT(socket_sendmsg, smack_socket_sendmsg), | |
4747 | LSM_HOOK_INIT(socket_sock_rcv_skb, smack_socket_sock_rcv_skb), | |
4748 | LSM_HOOK_INIT(socket_getpeersec_stream, smack_socket_getpeersec_stream), | |
4749 | LSM_HOOK_INIT(socket_getpeersec_dgram, smack_socket_getpeersec_dgram), | |
4750 | LSM_HOOK_INIT(sk_alloc_security, smack_sk_alloc_security), | |
4751 | LSM_HOOK_INIT(sk_free_security, smack_sk_free_security), | |
4752 | LSM_HOOK_INIT(sock_graft, smack_sock_graft), | |
4753 | LSM_HOOK_INIT(inet_conn_request, smack_inet_conn_request), | |
4754 | LSM_HOOK_INIT(inet_csk_clone, smack_inet_csk_clone), | |
d20bdda6 | 4755 | |
e114e473 CS |
4756 | /* key management security hooks */ |
4757 | #ifdef CONFIG_KEYS | |
e20b043a CS |
4758 | LSM_HOOK_INIT(key_alloc, smack_key_alloc), |
4759 | LSM_HOOK_INIT(key_free, smack_key_free), | |
4760 | LSM_HOOK_INIT(key_permission, smack_key_permission), | |
4761 | LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), | |
e114e473 | 4762 | #endif /* CONFIG_KEYS */ |
d20bdda6 AD |
4763 | |
4764 | /* Audit hooks */ | |
4765 | #ifdef CONFIG_AUDIT | |
e20b043a CS |
4766 | LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |
4767 | LSM_HOOK_INIT(audit_rule_known, smack_audit_rule_known), | |
4768 | LSM_HOOK_INIT(audit_rule_match, smack_audit_rule_match), | |
d20bdda6 AD |
4769 | #endif /* CONFIG_AUDIT */ |
4770 | ||
e20b043a CS |
4771 | LSM_HOOK_INIT(ismaclabel, smack_ismaclabel), |
4772 | LSM_HOOK_INIT(secid_to_secctx, smack_secid_to_secctx), | |
4773 | LSM_HOOK_INIT(secctx_to_secid, smack_secctx_to_secid), | |
e20b043a CS |
4774 | LSM_HOOK_INIT(inode_notifysecctx, smack_inode_notifysecctx), |
4775 | LSM_HOOK_INIT(inode_setsecctx, smack_inode_setsecctx), | |
4776 | LSM_HOOK_INIT(inode_getsecctx, smack_inode_getsecctx), | |
d6d80cb5 CS |
4777 | LSM_HOOK_INIT(inode_copy_up, smack_inode_copy_up), |
4778 | LSM_HOOK_INIT(inode_copy_up_xattr, smack_inode_copy_up_xattr), | |
4779 | LSM_HOOK_INIT(dentry_create_files_as, smack_dentry_create_files_as), | |
e114e473 CS |
4780 | }; |
4781 | ||
7198e2ee | 4782 | |
86812bb0 | 4783 | static __init void init_smack_known_list(void) |
7198e2ee | 4784 | { |
86812bb0 CS |
4785 | /* |
4786 | * Initialize rule list locks | |
4787 | */ | |
4788 | mutex_init(&smack_known_huh.smk_rules_lock); | |
4789 | mutex_init(&smack_known_hat.smk_rules_lock); | |
4790 | mutex_init(&smack_known_floor.smk_rules_lock); | |
4791 | mutex_init(&smack_known_star.smk_rules_lock); | |
86812bb0 CS |
4792 | mutex_init(&smack_known_web.smk_rules_lock); |
4793 | /* | |
4794 | * Initialize rule lists | |
4795 | */ | |
4796 | INIT_LIST_HEAD(&smack_known_huh.smk_rules); | |
4797 | INIT_LIST_HEAD(&smack_known_hat.smk_rules); | |
4798 | INIT_LIST_HEAD(&smack_known_star.smk_rules); | |
4799 | INIT_LIST_HEAD(&smack_known_floor.smk_rules); | |
86812bb0 CS |
4800 | INIT_LIST_HEAD(&smack_known_web.smk_rules); |
4801 | /* | |
4802 | * Create the known labels list | |
4803 | */ | |
4d7cf4a1 TS |
4804 | smk_insert_entry(&smack_known_huh); |
4805 | smk_insert_entry(&smack_known_hat); | |
4806 | smk_insert_entry(&smack_known_star); | |
4807 | smk_insert_entry(&smack_known_floor); | |
4d7cf4a1 | 4808 | smk_insert_entry(&smack_known_web); |
7198e2ee EB |
4809 | } |
4810 | ||
e114e473 CS |
4811 | /** |
4812 | * smack_init - initialize the smack system | |
4813 | * | |
4814 | * Returns 0 | |
4815 | */ | |
4816 | static __init int smack_init(void) | |
4817 | { | |
d84f4f99 | 4818 | struct cred *cred; |
676dac4b | 4819 | struct task_smack *tsp; |
d84f4f99 | 4820 | |
b1d9e6b0 | 4821 | if (!security_module_enable("smack")) |
7898e1f8 CS |
4822 | return 0; |
4823 | ||
1a5b472b R |
4824 | smack_inode_cache = KMEM_CACHE(inode_smack, 0); |
4825 | if (!smack_inode_cache) | |
4826 | return -ENOMEM; | |
4827 | ||
2f823ff8 CS |
4828 | tsp = new_task_smack(&smack_known_floor, &smack_known_floor, |
4829 | GFP_KERNEL); | |
1a5b472b R |
4830 | if (tsp == NULL) { |
4831 | kmem_cache_destroy(smack_inode_cache); | |
676dac4b | 4832 | return -ENOMEM; |
1a5b472b | 4833 | } |
676dac4b | 4834 | |
d21b7b04 JB |
4835 | smack_enabled = 1; |
4836 | ||
21abb1ec CS |
4837 | pr_info("Smack: Initializing.\n"); |
4838 | #ifdef CONFIG_SECURITY_SMACK_NETFILTER | |
4839 | pr_info("Smack: Netfilter enabled.\n"); | |
4840 | #endif | |
4841 | #ifdef SMACK_IPV6_PORT_LABELING | |
4842 | pr_info("Smack: IPv6 port labeling enabled.\n"); | |
4843 | #endif | |
4844 | #ifdef SMACK_IPV6_SECMARK_LABELING | |
4845 | pr_info("Smack: IPv6 Netfilter enabled.\n"); | |
4846 | #endif | |
e114e473 CS |
4847 | |
4848 | /* | |
4849 | * Set the security state for the initial task. | |
4850 | */ | |
d84f4f99 | 4851 | cred = (struct cred *) current->cred; |
676dac4b | 4852 | cred->security = tsp; |
e114e473 | 4853 | |
86812bb0 CS |
4854 | /* initialize the smack_known_list */ |
4855 | init_smack_known_list(); | |
e114e473 CS |
4856 | |
4857 | /* | |
4858 | * Register with LSM | |
4859 | */ | |
d69dece5 | 4860 | security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack"); |
e114e473 CS |
4861 | |
4862 | return 0; | |
4863 | } | |
4864 | ||
4865 | /* | |
4866 | * Smack requires early initialization in order to label | |
4867 | * all processes and objects when they are created. | |
4868 | */ | |
3d6e5f6d | 4869 | DEFINE_LSM(smack) = { |
07aed2f2 | 4870 | .name = "smack", |
3d6e5f6d KC |
4871 | .init = smack_init, |
4872 | }; |