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Commit | Line | Data |
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1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/net/sunrpc/auth_gss/auth_gss.c |
1da177e4 LT |
3 | * |
4 | * RPCSEC_GSS client authentication. | |
cca5172a | 5 | * |
1da177e4 LT |
6 | * Copyright (c) 2000 The Regents of the University of Michigan. |
7 | * All rights reserved. | |
8 | * | |
9 | * Dug Song <dugsong@monkey.org> | |
10 | * Andy Adamson <andros@umich.edu> | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * | |
16 | * 1. Redistributions of source code must retain the above copyright | |
17 | * notice, this list of conditions and the following disclaimer. | |
18 | * 2. Redistributions in binary form must reproduce the above copyright | |
19 | * notice, this list of conditions and the following disclaimer in the | |
20 | * documentation and/or other materials provided with the distribution. | |
21 | * 3. Neither the name of the University nor the names of its | |
22 | * contributors may be used to endorse or promote products derived | |
23 | * from this software without specific prior written permission. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
26 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
27 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
28 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
32 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
33 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
34 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
35 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
1da177e4 LT |
36 | */ |
37 | ||
38 | ||
39 | #include <linux/module.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/types.h> | |
42 | #include <linux/slab.h> | |
1da177e4 | 43 | #include <linux/sched.h> |
2d2da60c | 44 | #include <linux/pagemap.h> |
1da177e4 LT |
45 | #include <linux/sunrpc/clnt.h> |
46 | #include <linux/sunrpc/auth.h> | |
47 | #include <linux/sunrpc/auth_gss.h> | |
48 | #include <linux/sunrpc/svcauth_gss.h> | |
49 | #include <linux/sunrpc/gss_err.h> | |
50 | #include <linux/workqueue.h> | |
51 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
52 | #include <linux/sunrpc/gss_api.h> | |
7c0f6ba6 | 53 | #include <linux/uaccess.h> |
eb6dc19d | 54 | #include <linux/hashtable.h> |
1da177e4 | 55 | |
abfdbd53 TM |
56 | #include "../netns.h" |
57 | ||
f1c0a861 | 58 | static const struct rpc_authops authgss_ops; |
1da177e4 | 59 | |
f1c0a861 | 60 | static const struct rpc_credops gss_credops; |
0df7fb74 | 61 | static const struct rpc_credops gss_nullops; |
1da177e4 | 62 | |
126e216a TM |
63 | #define GSS_RETRY_EXPIRED 5 |
64 | static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; | |
65 | ||
4de6caa2 AA |
66 | #define GSS_KEY_EXPIRE_TIMEO 240 |
67 | static unsigned int gss_key_expire_timeo = GSS_KEY_EXPIRE_TIMEO; | |
68 | ||
f895b252 | 69 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
70 | # define RPCDBG_FACILITY RPCDBG_AUTH |
71 | #endif | |
72 | ||
725f2865 | 73 | #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) |
1da177e4 LT |
74 | /* length of a krb5 verifier (48), plus data added before arguments when |
75 | * using integrity (two 4-byte integers): */ | |
adeb8133 | 76 | #define GSS_VERF_SLACK 100 |
1da177e4 | 77 | |
23c323af | 78 | static DEFINE_HASHTABLE(gss_auth_hash_table, 4); |
eb6dc19d TM |
79 | static DEFINE_SPINLOCK(gss_auth_hash_lock); |
80 | ||
19172284 TM |
81 | struct gss_pipe { |
82 | struct rpc_pipe_dir_object pdo; | |
83 | struct rpc_pipe *pipe; | |
84 | struct rpc_clnt *clnt; | |
85 | const char *name; | |
414a6295 | 86 | struct kref kref; |
19172284 TM |
87 | }; |
88 | ||
1da177e4 | 89 | struct gss_auth { |
0285ed1f | 90 | struct kref kref; |
eb6dc19d | 91 | struct hlist_node hash; |
1da177e4 LT |
92 | struct rpc_auth rpc_auth; |
93 | struct gss_api_mech *mech; | |
94 | enum rpc_gss_svc service; | |
1da177e4 | 95 | struct rpc_clnt *client; |
e726340a | 96 | struct net *net; |
34769fc4 BF |
97 | /* |
98 | * There are two upcall pipes; dentry[1], named "gssd", is used | |
99 | * for the new text-based upcall; dentry[0] is named after the | |
100 | * mechanism (for example, "krb5") and exists for | |
101 | * backwards-compatibility with older gssd's. | |
102 | */ | |
19172284 | 103 | struct gss_pipe *gss_pipe[2]; |
bd4a3eb1 | 104 | const char *target_name; |
1da177e4 LT |
105 | }; |
106 | ||
79a3f20b | 107 | /* pipe_version >= 0 if and only if someone has a pipe open. */ |
79a3f20b BF |
108 | static DEFINE_SPINLOCK(pipe_version_lock); |
109 | static struct rpc_wait_queue pipe_version_rpc_waitqueue; | |
110 | static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); | |
9eb2ddb4 | 111 | static void gss_put_auth(struct gss_auth *gss_auth); |
cf81939d | 112 | |
5d28dc82 | 113 | static void gss_free_ctx(struct gss_cl_ctx *); |
b693ba4a TM |
114 | static const struct rpc_pipe_ops gss_upcall_ops_v0; |
115 | static const struct rpc_pipe_ops gss_upcall_ops_v1; | |
1da177e4 | 116 | |
1da177e4 LT |
117 | static inline struct gss_cl_ctx * |
118 | gss_get_ctx(struct gss_cl_ctx *ctx) | |
119 | { | |
0fa10472 | 120 | refcount_inc(&ctx->count); |
1da177e4 LT |
121 | return ctx; |
122 | } | |
123 | ||
124 | static inline void | |
125 | gss_put_ctx(struct gss_cl_ctx *ctx) | |
126 | { | |
0fa10472 | 127 | if (refcount_dec_and_test(&ctx->count)) |
5d28dc82 | 128 | gss_free_ctx(ctx); |
1da177e4 LT |
129 | } |
130 | ||
5d28dc82 TM |
131 | /* gss_cred_set_ctx: |
132 | * called by gss_upcall_callback and gss_create_upcall in order | |
133 | * to set the gss context. The actual exchange of an old context | |
9beae467 | 134 | * and a new one is protected by the pipe->lock. |
5d28dc82 | 135 | */ |
1da177e4 LT |
136 | static void |
137 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) | |
138 | { | |
139 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
5d28dc82 | 140 | |
cd019f75 TM |
141 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
142 | return; | |
7b6962b0 | 143 | gss_get_ctx(ctx); |
cf778b00 | 144 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
fc432dd9 | 145 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
4e857c58 | 146 | smp_mb__before_atomic(); |
fc432dd9 | 147 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
1da177e4 LT |
148 | } |
149 | ||
150 | static const void * | |
151 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) | |
152 | { | |
153 | const void *q = (const void *)((const char *)p + len); | |
154 | if (unlikely(q > end || q < p)) | |
155 | return ERR_PTR(-EFAULT); | |
156 | memcpy(res, p, len); | |
157 | return q; | |
158 | } | |
159 | ||
160 | static inline const void * | |
161 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) | |
162 | { | |
163 | const void *q; | |
164 | unsigned int len; | |
165 | ||
166 | p = simple_get_bytes(p, end, &len, sizeof(len)); | |
167 | if (IS_ERR(p)) | |
168 | return p; | |
169 | q = (const void *)((const char *)p + len); | |
170 | if (unlikely(q > end || q < p)) | |
171 | return ERR_PTR(-EFAULT); | |
0f38b873 | 172 | dest->data = kmemdup(p, len, GFP_NOFS); |
1da177e4 LT |
173 | if (unlikely(dest->data == NULL)) |
174 | return ERR_PTR(-ENOMEM); | |
175 | dest->len = len; | |
1da177e4 LT |
176 | return q; |
177 | } | |
178 | ||
179 | static struct gss_cl_ctx * | |
180 | gss_cred_get_ctx(struct rpc_cred *cred) | |
181 | { | |
182 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
183 | struct gss_cl_ctx *ctx = NULL; | |
184 | ||
5d28dc82 | 185 | rcu_read_lock(); |
c5e6aecd JL |
186 | ctx = rcu_dereference(gss_cred->gc_ctx); |
187 | if (ctx) | |
188 | gss_get_ctx(ctx); | |
5d28dc82 | 189 | rcu_read_unlock(); |
1da177e4 LT |
190 | return ctx; |
191 | } | |
192 | ||
193 | static struct gss_cl_ctx * | |
194 | gss_alloc_context(void) | |
195 | { | |
196 | struct gss_cl_ctx *ctx; | |
197 | ||
0f38b873 | 198 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
1da177e4 | 199 | if (ctx != NULL) { |
1da177e4 LT |
200 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
201 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ | |
202 | spin_lock_init(&ctx->gc_seq_lock); | |
0fa10472 | 203 | refcount_set(&ctx->count,1); |
1da177e4 LT |
204 | } |
205 | return ctx; | |
206 | } | |
207 | ||
208 | #define GSSD_MIN_TIMEOUT (60 * 60) | |
209 | static const void * | |
210 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) | |
211 | { | |
212 | const void *q; | |
213 | unsigned int seclen; | |
214 | unsigned int timeout; | |
620038f6 | 215 | unsigned long now = jiffies; |
1da177e4 LT |
216 | u32 window_size; |
217 | int ret; | |
218 | ||
620038f6 AA |
219 | /* First unsigned int gives the remaining lifetime in seconds of the |
220 | * credential - e.g. the remaining TGT lifetime for Kerberos or | |
221 | * the -t value passed to GSSD. | |
222 | */ | |
1da177e4 LT |
223 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
224 | if (IS_ERR(p)) | |
225 | goto err; | |
226 | if (timeout == 0) | |
227 | timeout = GSSD_MIN_TIMEOUT; | |
620038f6 AA |
228 | ctx->gc_expiry = now + ((unsigned long)timeout * HZ); |
229 | /* Sequence number window. Determines the maximum number of | |
230 | * simultaneous requests | |
231 | */ | |
1da177e4 LT |
232 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
233 | if (IS_ERR(p)) | |
234 | goto err; | |
235 | ctx->gc_win = window_size; | |
236 | /* gssd signals an error by passing ctx->gc_win = 0: */ | |
237 | if (ctx->gc_win == 0) { | |
dc5ddce9 JL |
238 | /* |
239 | * in which case, p points to an error code. Anything other | |
240 | * than -EKEYEXPIRED gets converted to -EACCES. | |
241 | */ | |
242 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); | |
243 | if (!IS_ERR(p)) | |
244 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : | |
245 | ERR_PTR(-EACCES); | |
1da177e4 LT |
246 | goto err; |
247 | } | |
248 | /* copy the opaque wire context */ | |
249 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); | |
250 | if (IS_ERR(p)) | |
251 | goto err; | |
252 | /* import the opaque security context */ | |
253 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); | |
254 | if (IS_ERR(p)) | |
255 | goto err; | |
256 | q = (const void *)((const char *)p + seclen); | |
257 | if (unlikely(q > end || q < p)) { | |
258 | p = ERR_PTR(-EFAULT); | |
259 | goto err; | |
260 | } | |
400f26b5 | 261 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, NULL, GFP_NOFS); |
1da177e4 LT |
262 | if (ret < 0) { |
263 | p = ERR_PTR(ret); | |
264 | goto err; | |
265 | } | |
2004c726 JL |
266 | |
267 | /* is there any trailing data? */ | |
268 | if (q == end) { | |
269 | p = q; | |
270 | goto done; | |
271 | } | |
272 | ||
273 | /* pull in acceptor name (if there is one) */ | |
274 | p = simple_get_netobj(q, end, &ctx->gc_acceptor); | |
275 | if (IS_ERR(p)) | |
276 | goto err; | |
277 | done: | |
278 | dprintk("RPC: %s Success. gc_expiry %lu now %lu timeout %u acceptor %.*s\n", | |
279 | __func__, ctx->gc_expiry, now, timeout, ctx->gc_acceptor.len, | |
280 | ctx->gc_acceptor.data); | |
281 | return p; | |
1da177e4 | 282 | err: |
173db309 | 283 | dprintk("RPC: %s returns error %ld\n", __func__, -PTR_ERR(p)); |
1da177e4 LT |
284 | return p; |
285 | } | |
286 | ||
a1a23777 CL |
287 | /* XXX: Need some documentation about why UPCALL_BUF_LEN is so small. |
288 | * Is user space expecting no more than UPCALL_BUF_LEN bytes? | |
289 | * Note that there are now _two_ NI_MAXHOST sized data items | |
290 | * being passed in this string. | |
291 | */ | |
292 | #define UPCALL_BUF_LEN 256 | |
1da177e4 LT |
293 | |
294 | struct gss_upcall_msg { | |
7ff13969 | 295 | refcount_t count; |
7eaf040b | 296 | kuid_t uid; |
1da177e4 LT |
297 | struct rpc_pipe_msg msg; |
298 | struct list_head list; | |
299 | struct gss_auth *auth; | |
9beae467 | 300 | struct rpc_pipe *pipe; |
1da177e4 LT |
301 | struct rpc_wait_queue rpc_waitqueue; |
302 | wait_queue_head_t waitqueue; | |
303 | struct gss_cl_ctx *ctx; | |
34769fc4 | 304 | char databuf[UPCALL_BUF_LEN]; |
1da177e4 LT |
305 | }; |
306 | ||
2aed8b47 | 307 | static int get_pipe_version(struct net *net) |
79a3f20b | 308 | { |
2aed8b47 | 309 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
79a3f20b BF |
310 | int ret; |
311 | ||
312 | spin_lock(&pipe_version_lock); | |
2aed8b47 TM |
313 | if (sn->pipe_version >= 0) { |
314 | atomic_inc(&sn->pipe_users); | |
315 | ret = sn->pipe_version; | |
79a3f20b BF |
316 | } else |
317 | ret = -EAGAIN; | |
318 | spin_unlock(&pipe_version_lock); | |
319 | return ret; | |
320 | } | |
321 | ||
2aed8b47 | 322 | static void put_pipe_version(struct net *net) |
79a3f20b | 323 | { |
2aed8b47 TM |
324 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
325 | ||
326 | if (atomic_dec_and_lock(&sn->pipe_users, &pipe_version_lock)) { | |
327 | sn->pipe_version = -1; | |
79a3f20b BF |
328 | spin_unlock(&pipe_version_lock); |
329 | } | |
330 | } | |
331 | ||
1da177e4 LT |
332 | static void |
333 | gss_release_msg(struct gss_upcall_msg *gss_msg) | |
334 | { | |
e726340a | 335 | struct net *net = gss_msg->auth->net; |
7ff13969 | 336 | if (!refcount_dec_and_test(&gss_msg->count)) |
1da177e4 | 337 | return; |
2aed8b47 | 338 | put_pipe_version(net); |
1da177e4 LT |
339 | BUG_ON(!list_empty(&gss_msg->list)); |
340 | if (gss_msg->ctx != NULL) | |
341 | gss_put_ctx(gss_msg->ctx); | |
f6a1cc89 | 342 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
9eb2ddb4 | 343 | gss_put_auth(gss_msg->auth); |
1da177e4 LT |
344 | kfree(gss_msg); |
345 | } | |
346 | ||
347 | static struct gss_upcall_msg * | |
9130b8db | 348 | __gss_find_upcall(struct rpc_pipe *pipe, kuid_t uid, const struct gss_auth *auth) |
1da177e4 LT |
349 | { |
350 | struct gss_upcall_msg *pos; | |
9beae467 | 351 | list_for_each_entry(pos, &pipe->in_downcall, list) { |
0b4d51b0 | 352 | if (!uid_eq(pos->uid, uid)) |
1da177e4 | 353 | continue; |
9130b8db OK |
354 | if (auth && pos->auth->service != auth->service) |
355 | continue; | |
7ff13969 | 356 | refcount_inc(&pos->count); |
632f0d05 | 357 | dprintk("RPC: %s found msg %p\n", __func__, pos); |
1da177e4 LT |
358 | return pos; |
359 | } | |
632f0d05 | 360 | dprintk("RPC: %s found nothing\n", __func__); |
1da177e4 LT |
361 | return NULL; |
362 | } | |
363 | ||
720b8f2d | 364 | /* Try to add an upcall to the pipefs queue. |
1da177e4 LT |
365 | * If an upcall owned by our uid already exists, then we return a reference |
366 | * to that upcall instead of adding the new upcall. | |
367 | */ | |
368 | static inline struct gss_upcall_msg * | |
053e324f | 369 | gss_add_msg(struct gss_upcall_msg *gss_msg) |
1da177e4 | 370 | { |
9beae467 | 371 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 LT |
372 | struct gss_upcall_msg *old; |
373 | ||
9beae467 | 374 | spin_lock(&pipe->lock); |
9130b8db | 375 | old = __gss_find_upcall(pipe, gss_msg->uid, gss_msg->auth); |
1da177e4 | 376 | if (old == NULL) { |
7ff13969 | 377 | refcount_inc(&gss_msg->count); |
9beae467 | 378 | list_add(&gss_msg->list, &pipe->in_downcall); |
1da177e4 LT |
379 | } else |
380 | gss_msg = old; | |
9beae467 | 381 | spin_unlock(&pipe->lock); |
1da177e4 LT |
382 | return gss_msg; |
383 | } | |
384 | ||
385 | static void | |
386 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
387 | { | |
1da177e4 LT |
388 | list_del_init(&gss_msg->list); |
389 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
390 | wake_up_all(&gss_msg->waitqueue); | |
7ff13969 | 391 | refcount_dec(&gss_msg->count); |
1da177e4 LT |
392 | } |
393 | ||
394 | static void | |
395 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) | |
396 | { | |
9beae467 | 397 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 398 | |
3b68aaea TM |
399 | if (list_empty(&gss_msg->list)) |
400 | return; | |
9beae467 | 401 | spin_lock(&pipe->lock); |
3b68aaea TM |
402 | if (!list_empty(&gss_msg->list)) |
403 | __gss_unhash_msg(gss_msg); | |
9beae467 | 404 | spin_unlock(&pipe->lock); |
1da177e4 LT |
405 | } |
406 | ||
126e216a TM |
407 | static void |
408 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) | |
409 | { | |
410 | switch (gss_msg->msg.errno) { | |
411 | case 0: | |
412 | if (gss_msg->ctx == NULL) | |
413 | break; | |
414 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
415 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); | |
416 | break; | |
417 | case -EKEYEXPIRED: | |
418 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); | |
419 | } | |
420 | gss_cred->gc_upcall_timestamp = jiffies; | |
421 | gss_cred->gc_upcall = NULL; | |
422 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); | |
423 | } | |
424 | ||
1da177e4 LT |
425 | static void |
426 | gss_upcall_callback(struct rpc_task *task) | |
427 | { | |
a17c2153 | 428 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
1da177e4 LT |
429 | struct gss_cred, gc_base); |
430 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; | |
9beae467 | 431 | struct rpc_pipe *pipe = gss_msg->pipe; |
1da177e4 | 432 | |
9beae467 | 433 | spin_lock(&pipe->lock); |
126e216a | 434 | gss_handle_downcall_result(gss_cred, gss_msg); |
9beae467 | 435 | spin_unlock(&pipe->lock); |
126e216a | 436 | task->tk_status = gss_msg->msg.errno; |
1da177e4 LT |
437 | gss_release_msg(gss_msg); |
438 | } | |
439 | ||
34769fc4 BF |
440 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
441 | { | |
90602c7b EB |
442 | uid_t uid = from_kuid(&init_user_ns, gss_msg->uid); |
443 | memcpy(gss_msg->databuf, &uid, sizeof(uid)); | |
444 | gss_msg->msg.data = gss_msg->databuf; | |
445 | gss_msg->msg.len = sizeof(uid); | |
9d3a2260 TM |
446 | |
447 | BUILD_BUG_ON(sizeof(uid) > sizeof(gss_msg->databuf)); | |
34769fc4 BF |
448 | } |
449 | ||
9d3a2260 | 450 | static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
bd4a3eb1 TM |
451 | const char *service_name, |
452 | const char *target_name) | |
34769fc4 | 453 | { |
683ac665 | 454 | struct gss_api_mech *mech = gss_msg->auth->mech; |
8b1c7bf5 | 455 | char *p = gss_msg->databuf; |
9d3a2260 TM |
456 | size_t buflen = sizeof(gss_msg->databuf); |
457 | int len; | |
458 | ||
459 | len = scnprintf(p, buflen, "mech=%s uid=%d ", mech->gm_name, | |
460 | from_kuid(&init_user_ns, gss_msg->uid)); | |
461 | buflen -= len; | |
462 | p += len; | |
463 | gss_msg->msg.len = len; | |
108b833c CL |
464 | |
465 | /* | |
466 | * target= is a full service principal that names the remote | |
467 | * identity that we are authenticating to. | |
468 | */ | |
bd4a3eb1 | 469 | if (target_name) { |
9d3a2260 TM |
470 | len = scnprintf(p, buflen, "target=%s ", target_name); |
471 | buflen -= len; | |
8b1c7bf5 OK |
472 | p += len; |
473 | gss_msg->msg.len += len; | |
474 | } | |
108b833c CL |
475 | |
476 | /* | |
477 | * gssd uses service= and srchost= to select a matching key from | |
478 | * the system's keytab to use as the source principal. | |
479 | * | |
480 | * service= is the service name part of the source principal, | |
481 | * or "*" (meaning choose any). | |
482 | * | |
483 | * srchost= is the hostname part of the source principal. When | |
484 | * not provided, gssd uses the local hostname. | |
485 | */ | |
a1a23777 CL |
486 | if (service_name) { |
487 | char *c = strchr(service_name, '@'); | |
488 | ||
489 | if (!c) | |
490 | len = scnprintf(p, buflen, "service=%s ", | |
491 | service_name); | |
492 | else | |
493 | len = scnprintf(p, buflen, | |
494 | "service=%.*s srchost=%s ", | |
495 | (int)(c - service_name), | |
496 | service_name, c + 1); | |
9d3a2260 | 497 | buflen -= len; |
2efef708 OK |
498 | p += len; |
499 | gss_msg->msg.len += len; | |
500 | } | |
108b833c | 501 | |
683ac665 | 502 | if (mech->gm_upcall_enctypes) { |
9d3a2260 TM |
503 | len = scnprintf(p, buflen, "enctypes=%s ", |
504 | mech->gm_upcall_enctypes); | |
505 | buflen -= len; | |
683ac665 TM |
506 | p += len; |
507 | gss_msg->msg.len += len; | |
508 | } | |
9d3a2260 TM |
509 | len = scnprintf(p, buflen, "\n"); |
510 | if (len == 0) | |
511 | goto out_overflow; | |
8b1c7bf5 OK |
512 | gss_msg->msg.len += len; |
513 | ||
34769fc4 | 514 | gss_msg->msg.data = gss_msg->databuf; |
9d3a2260 TM |
515 | return 0; |
516 | out_overflow: | |
517 | WARN_ON_ONCE(1); | |
518 | return -ENOMEM; | |
34769fc4 BF |
519 | } |
520 | ||
68c97153 | 521 | static struct gss_upcall_msg * |
e726340a | 522 | gss_alloc_msg(struct gss_auth *gss_auth, |
7eaf040b | 523 | kuid_t uid, const char *service_name) |
1da177e4 LT |
524 | { |
525 | struct gss_upcall_msg *gss_msg; | |
79a3f20b | 526 | int vers; |
9d3a2260 | 527 | int err = -ENOMEM; |
1da177e4 | 528 | |
0f38b873 | 529 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
db75b3d6 | 530 | if (gss_msg == NULL) |
9d3a2260 | 531 | goto err; |
e726340a | 532 | vers = get_pipe_version(gss_auth->net); |
9d3a2260 TM |
533 | err = vers; |
534 | if (err < 0) | |
535 | goto err_free_msg; | |
19172284 | 536 | gss_msg->pipe = gss_auth->gss_pipe[vers]->pipe; |
db75b3d6 BF |
537 | INIT_LIST_HEAD(&gss_msg->list); |
538 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); | |
539 | init_waitqueue_head(&gss_msg->waitqueue); | |
7ff13969 | 540 | refcount_set(&gss_msg->count, 1); |
db75b3d6 BF |
541 | gss_msg->uid = uid; |
542 | gss_msg->auth = gss_auth; | |
bd4a3eb1 TM |
543 | switch (vers) { |
544 | case 0: | |
545 | gss_encode_v0_msg(gss_msg); | |
5fccc5b5 | 546 | break; |
bd4a3eb1 | 547 | default: |
9d3a2260 TM |
548 | err = gss_encode_v1_msg(gss_msg, service_name, gss_auth->target_name); |
549 | if (err) | |
e9776d0f | 550 | goto err_put_pipe_version; |
07d53ae4 | 551 | } |
9eb2ddb4 | 552 | kref_get(&gss_auth->kref); |
1da177e4 | 553 | return gss_msg; |
e9776d0f TM |
554 | err_put_pipe_version: |
555 | put_pipe_version(gss_auth->net); | |
9d3a2260 TM |
556 | err_free_msg: |
557 | kfree(gss_msg); | |
558 | err: | |
559 | return ERR_PTR(err); | |
1da177e4 LT |
560 | } |
561 | ||
562 | static struct gss_upcall_msg * | |
e726340a | 563 | gss_setup_upcall(struct gss_auth *gss_auth, struct rpc_cred *cred) |
1da177e4 | 564 | { |
7c67db3a TM |
565 | struct gss_cred *gss_cred = container_of(cred, |
566 | struct gss_cred, gc_base); | |
1da177e4 | 567 | struct gss_upcall_msg *gss_new, *gss_msg; |
7eaf040b | 568 | kuid_t uid = cred->cr_uid; |
1da177e4 | 569 | |
e726340a | 570 | gss_new = gss_alloc_msg(gss_auth, uid, gss_cred->gc_principal); |
db75b3d6 BF |
571 | if (IS_ERR(gss_new)) |
572 | return gss_new; | |
053e324f | 573 | gss_msg = gss_add_msg(gss_new); |
1da177e4 | 574 | if (gss_msg == gss_new) { |
1cded9d2 | 575 | int res; |
7ff13969 | 576 | refcount_inc(&gss_msg->count); |
1cded9d2 | 577 | res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); |
1da177e4 LT |
578 | if (res) { |
579 | gss_unhash_msg(gss_new); | |
7ff13969 | 580 | refcount_dec(&gss_msg->count); |
1cded9d2 | 581 | gss_release_msg(gss_new); |
1da177e4 LT |
582 | gss_msg = ERR_PTR(res); |
583 | } | |
584 | } else | |
585 | gss_release_msg(gss_new); | |
586 | return gss_msg; | |
587 | } | |
588 | ||
b03568c3 BF |
589 | static void warn_gssd(void) |
590 | { | |
0ea9de0e | 591 | dprintk("AUTH_GSS upcall failed. Please check user daemon is running.\n"); |
b03568c3 BF |
592 | } |
593 | ||
1da177e4 LT |
594 | static inline int |
595 | gss_refresh_upcall(struct rpc_task *task) | |
596 | { | |
a17c2153 | 597 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
4a8c1344 | 598 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
1da177e4 LT |
599 | struct gss_auth, rpc_auth); |
600 | struct gss_cred *gss_cred = container_of(cred, | |
601 | struct gss_cred, gc_base); | |
602 | struct gss_upcall_msg *gss_msg; | |
9beae467 | 603 | struct rpc_pipe *pipe; |
1da177e4 LT |
604 | int err = 0; |
605 | ||
632f0d05 | 606 | dprintk("RPC: %5u %s for uid %u\n", |
cdba321e | 607 | task->tk_pid, __func__, from_kuid(&init_user_ns, cred->cr_uid)); |
e726340a | 608 | gss_msg = gss_setup_upcall(gss_auth, cred); |
480e3243 | 609 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
79a3f20b BF |
610 | /* XXX: warning on the first, under the assumption we |
611 | * shouldn't normally hit this case on a refresh. */ | |
612 | warn_gssd(); | |
613 | task->tk_timeout = 15*HZ; | |
614 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); | |
d1a8016a | 615 | return -EAGAIN; |
79a3f20b | 616 | } |
1da177e4 LT |
617 | if (IS_ERR(gss_msg)) { |
618 | err = PTR_ERR(gss_msg); | |
619 | goto out; | |
620 | } | |
9beae467 SK |
621 | pipe = gss_msg->pipe; |
622 | spin_lock(&pipe->lock); | |
1da177e4 | 623 | if (gss_cred->gc_upcall != NULL) |
5d00837b | 624 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
126e216a | 625 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
1da177e4 LT |
626 | task->tk_timeout = 0; |
627 | gss_cred->gc_upcall = gss_msg; | |
628 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ | |
7ff13969 | 629 | refcount_inc(&gss_msg->count); |
5d00837b | 630 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
126e216a TM |
631 | } else { |
632 | gss_handle_downcall_result(gss_cred, gss_msg); | |
1da177e4 | 633 | err = gss_msg->msg.errno; |
126e216a | 634 | } |
9beae467 | 635 | spin_unlock(&pipe->lock); |
1da177e4 LT |
636 | gss_release_msg(gss_msg); |
637 | out: | |
632f0d05 | 638 | dprintk("RPC: %5u %s for uid %u result %d\n", |
cdba321e EB |
639 | task->tk_pid, __func__, |
640 | from_kuid(&init_user_ns, cred->cr_uid), err); | |
1da177e4 LT |
641 | return err; |
642 | } | |
643 | ||
644 | static inline int | |
645 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
646 | { | |
e726340a | 647 | struct net *net = gss_auth->net; |
abfdbd53 | 648 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
9beae467 | 649 | struct rpc_pipe *pipe; |
1da177e4 LT |
650 | struct rpc_cred *cred = &gss_cred->gc_base; |
651 | struct gss_upcall_msg *gss_msg; | |
652 | DEFINE_WAIT(wait); | |
d36ccb9c | 653 | int err; |
1da177e4 | 654 | |
cdba321e EB |
655 | dprintk("RPC: %s for uid %u\n", |
656 | __func__, from_kuid(&init_user_ns, cred->cr_uid)); | |
79a3f20b | 657 | retry: |
d36ccb9c | 658 | err = 0; |
89f84243 JL |
659 | /* if gssd is down, just skip upcalling altogether */ |
660 | if (!gssd_running(net)) { | |
661 | warn_gssd(); | |
662 | return -EACCES; | |
663 | } | |
e726340a | 664 | gss_msg = gss_setup_upcall(gss_auth, cred); |
79a3f20b BF |
665 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
666 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, | |
89f84243 | 667 | sn->pipe_version >= 0, 15 * HZ); |
2aed8b47 | 668 | if (sn->pipe_version < 0) { |
d1a8016a BS |
669 | warn_gssd(); |
670 | err = -EACCES; | |
671 | } | |
d36ccb9c | 672 | if (err < 0) |
79a3f20b | 673 | goto out; |
79a3f20b BF |
674 | goto retry; |
675 | } | |
1da177e4 LT |
676 | if (IS_ERR(gss_msg)) { |
677 | err = PTR_ERR(gss_msg); | |
678 | goto out; | |
679 | } | |
9beae467 | 680 | pipe = gss_msg->pipe; |
1da177e4 | 681 | for (;;) { |
5afa9133 | 682 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
9beae467 | 683 | spin_lock(&pipe->lock); |
1da177e4 | 684 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
1da177e4 LT |
685 | break; |
686 | } | |
9beae467 | 687 | spin_unlock(&pipe->lock); |
5afa9133 | 688 | if (fatal_signal_pending(current)) { |
1da177e4 LT |
689 | err = -ERESTARTSYS; |
690 | goto out_intr; | |
691 | } | |
692 | schedule(); | |
693 | } | |
694 | if (gss_msg->ctx) | |
7b6962b0 | 695 | gss_cred_set_ctx(cred, gss_msg->ctx); |
1da177e4 LT |
696 | else |
697 | err = gss_msg->msg.errno; | |
9beae467 | 698 | spin_unlock(&pipe->lock); |
1da177e4 LT |
699 | out_intr: |
700 | finish_wait(&gss_msg->waitqueue, &wait); | |
701 | gss_release_msg(gss_msg); | |
702 | out: | |
632f0d05 | 703 | dprintk("RPC: %s for uid %u result %d\n", |
cdba321e | 704 | __func__, from_kuid(&init_user_ns, cred->cr_uid), err); |
1da177e4 LT |
705 | return err; |
706 | } | |
707 | ||
1da177e4 LT |
708 | #define MSG_BUF_MAXSIZE 1024 |
709 | ||
710 | static ssize_t | |
711 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
712 | { | |
713 | const void *p, *end; | |
714 | void *buf; | |
1da177e4 | 715 | struct gss_upcall_msg *gss_msg; |
496ad9aa | 716 | struct rpc_pipe *pipe = RPC_I(file_inode(filp))->pipe; |
1da177e4 | 717 | struct gss_cl_ctx *ctx; |
90602c7b EB |
718 | uid_t id; |
719 | kuid_t uid; | |
3b68aaea | 720 | ssize_t err = -EFBIG; |
1da177e4 LT |
721 | |
722 | if (mlen > MSG_BUF_MAXSIZE) | |
723 | goto out; | |
724 | err = -ENOMEM; | |
0f38b873 | 725 | buf = kmalloc(mlen, GFP_NOFS); |
1da177e4 LT |
726 | if (!buf) |
727 | goto out; | |
728 | ||
1da177e4 LT |
729 | err = -EFAULT; |
730 | if (copy_from_user(buf, src, mlen)) | |
731 | goto err; | |
732 | ||
733 | end = (const void *)((char *)buf + mlen); | |
90602c7b | 734 | p = simple_get_bytes(buf, end, &id, sizeof(id)); |
1da177e4 LT |
735 | if (IS_ERR(p)) { |
736 | err = PTR_ERR(p); | |
737 | goto err; | |
738 | } | |
739 | ||
90602c7b EB |
740 | uid = make_kuid(&init_user_ns, id); |
741 | if (!uid_valid(uid)) { | |
742 | err = -EINVAL; | |
743 | goto err; | |
744 | } | |
745 | ||
1da177e4 LT |
746 | err = -ENOMEM; |
747 | ctx = gss_alloc_context(); | |
748 | if (ctx == NULL) | |
749 | goto err; | |
3b68aaea TM |
750 | |
751 | err = -ENOENT; | |
752 | /* Find a matching upcall */ | |
9beae467 | 753 | spin_lock(&pipe->lock); |
9130b8db | 754 | gss_msg = __gss_find_upcall(pipe, uid, NULL); |
3b68aaea | 755 | if (gss_msg == NULL) { |
9beae467 | 756 | spin_unlock(&pipe->lock); |
3b68aaea TM |
757 | goto err_put_ctx; |
758 | } | |
759 | list_del_init(&gss_msg->list); | |
9beae467 | 760 | spin_unlock(&pipe->lock); |
3b68aaea | 761 | |
6e84c7b6 | 762 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
1da177e4 LT |
763 | if (IS_ERR(p)) { |
764 | err = PTR_ERR(p); | |
486bad2e JL |
765 | switch (err) { |
766 | case -EACCES: | |
dc5ddce9 | 767 | case -EKEYEXPIRED: |
486bad2e JL |
768 | gss_msg->msg.errno = err; |
769 | err = mlen; | |
770 | break; | |
771 | case -EFAULT: | |
772 | case -ENOMEM: | |
773 | case -EINVAL: | |
774 | case -ENOSYS: | |
775 | gss_msg->msg.errno = -EAGAIN; | |
776 | break; | |
777 | default: | |
778 | printk(KERN_CRIT "%s: bad return from " | |
6c853099 | 779 | "gss_fill_context: %zd\n", __func__, err); |
437b300c | 780 | gss_msg->msg.errno = -EIO; |
486bad2e | 781 | } |
3b68aaea | 782 | goto err_release_msg; |
1da177e4 | 783 | } |
3b68aaea TM |
784 | gss_msg->ctx = gss_get_ctx(ctx); |
785 | err = mlen; | |
786 | ||
787 | err_release_msg: | |
9beae467 | 788 | spin_lock(&pipe->lock); |
3b68aaea | 789 | __gss_unhash_msg(gss_msg); |
9beae467 | 790 | spin_unlock(&pipe->lock); |
3b68aaea | 791 | gss_release_msg(gss_msg); |
1da177e4 LT |
792 | err_put_ctx: |
793 | gss_put_ctx(ctx); | |
794 | err: | |
795 | kfree(buf); | |
796 | out: | |
5b5e0928 | 797 | dprintk("RPC: %s returning %zd\n", __func__, err); |
1da177e4 LT |
798 | return err; |
799 | } | |
800 | ||
34769fc4 | 801 | static int gss_pipe_open(struct inode *inode, int new_version) |
cf81939d | 802 | { |
2aed8b47 TM |
803 | struct net *net = inode->i_sb->s_fs_info; |
804 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
34769fc4 BF |
805 | int ret = 0; |
806 | ||
79a3f20b | 807 | spin_lock(&pipe_version_lock); |
2aed8b47 | 808 | if (sn->pipe_version < 0) { |
34769fc4 | 809 | /* First open of any gss pipe determines the version: */ |
2aed8b47 | 810 | sn->pipe_version = new_version; |
79a3f20b BF |
811 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
812 | wake_up(&pipe_version_waitqueue); | |
2aed8b47 | 813 | } else if (sn->pipe_version != new_version) { |
34769fc4 BF |
814 | /* Trying to open a pipe of a different version */ |
815 | ret = -EBUSY; | |
816 | goto out; | |
79a3f20b | 817 | } |
2aed8b47 | 818 | atomic_inc(&sn->pipe_users); |
34769fc4 | 819 | out: |
79a3f20b | 820 | spin_unlock(&pipe_version_lock); |
34769fc4 BF |
821 | return ret; |
822 | ||
823 | } | |
824 | ||
825 | static int gss_pipe_open_v0(struct inode *inode) | |
826 | { | |
827 | return gss_pipe_open(inode, 0); | |
828 | } | |
829 | ||
830 | static int gss_pipe_open_v1(struct inode *inode) | |
831 | { | |
832 | return gss_pipe_open(inode, 1); | |
cf81939d BF |
833 | } |
834 | ||
1da177e4 LT |
835 | static void |
836 | gss_pipe_release(struct inode *inode) | |
837 | { | |
2aed8b47 | 838 | struct net *net = inode->i_sb->s_fs_info; |
9beae467 | 839 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
6e84c7b6 | 840 | struct gss_upcall_msg *gss_msg; |
1da177e4 | 841 | |
5a67657a | 842 | restart: |
9beae467 SK |
843 | spin_lock(&pipe->lock); |
844 | list_for_each_entry(gss_msg, &pipe->in_downcall, list) { | |
1da177e4 | 845 | |
5a67657a TM |
846 | if (!list_empty(&gss_msg->msg.list)) |
847 | continue; | |
1da177e4 | 848 | gss_msg->msg.errno = -EPIPE; |
7ff13969 | 849 | refcount_inc(&gss_msg->count); |
1da177e4 | 850 | __gss_unhash_msg(gss_msg); |
9beae467 | 851 | spin_unlock(&pipe->lock); |
1da177e4 | 852 | gss_release_msg(gss_msg); |
5a67657a | 853 | goto restart; |
1da177e4 | 854 | } |
9beae467 | 855 | spin_unlock(&pipe->lock); |
cf81939d | 856 | |
2aed8b47 | 857 | put_pipe_version(net); |
1da177e4 LT |
858 | } |
859 | ||
860 | static void | |
861 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) | |
862 | { | |
863 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); | |
1da177e4 LT |
864 | |
865 | if (msg->errno < 0) { | |
632f0d05 CL |
866 | dprintk("RPC: %s releasing msg %p\n", |
867 | __func__, gss_msg); | |
7ff13969 | 868 | refcount_inc(&gss_msg->count); |
1da177e4 | 869 | gss_unhash_msg(gss_msg); |
b03568c3 BF |
870 | if (msg->errno == -ETIMEDOUT) |
871 | warn_gssd(); | |
1da177e4 LT |
872 | gss_release_msg(gss_msg); |
873 | } | |
1cded9d2 | 874 | gss_release_msg(gss_msg); |
1da177e4 LT |
875 | } |
876 | ||
19172284 TM |
877 | static void gss_pipe_dentry_destroy(struct dentry *dir, |
878 | struct rpc_pipe_dir_object *pdo) | |
ccdc28f8 | 879 | { |
19172284 TM |
880 | struct gss_pipe *gss_pipe = pdo->pdo_data; |
881 | struct rpc_pipe *pipe = gss_pipe->pipe; | |
ccdc28f8 | 882 | |
19172284 TM |
883 | if (pipe->dentry != NULL) { |
884 | rpc_unlink(pipe->dentry); | |
885 | pipe->dentry = NULL; | |
6b2fddd3 | 886 | } |
ccdc28f8 SK |
887 | } |
888 | ||
19172284 TM |
889 | static int gss_pipe_dentry_create(struct dentry *dir, |
890 | struct rpc_pipe_dir_object *pdo) | |
ccdc28f8 | 891 | { |
19172284 | 892 | struct gss_pipe *p = pdo->pdo_data; |
6b2fddd3 | 893 | struct dentry *dentry; |
ccdc28f8 | 894 | |
19172284 TM |
895 | dentry = rpc_mkpipe_dentry(dir, p->name, p->clnt, p->pipe); |
896 | if (IS_ERR(dentry)) | |
897 | return PTR_ERR(dentry); | |
898 | p->pipe->dentry = dentry; | |
899 | return 0; | |
900 | } | |
901 | ||
902 | static const struct rpc_pipe_dir_object_ops gss_pipe_dir_object_ops = { | |
903 | .create = gss_pipe_dentry_create, | |
904 | .destroy = gss_pipe_dentry_destroy, | |
905 | }; | |
906 | ||
907 | static struct gss_pipe *gss_pipe_alloc(struct rpc_clnt *clnt, | |
908 | const char *name, | |
909 | const struct rpc_pipe_ops *upcall_ops) | |
910 | { | |
19172284 TM |
911 | struct gss_pipe *p; |
912 | int err = -ENOMEM; | |
ccdc28f8 | 913 | |
19172284 TM |
914 | p = kmalloc(sizeof(*p), GFP_KERNEL); |
915 | if (p == NULL) | |
6b2fddd3 | 916 | goto err; |
19172284 TM |
917 | p->pipe = rpc_mkpipe_data(upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); |
918 | if (IS_ERR(p->pipe)) { | |
919 | err = PTR_ERR(p->pipe); | |
920 | goto err_free_gss_pipe; | |
6b2fddd3 | 921 | } |
19172284 TM |
922 | p->name = name; |
923 | p->clnt = clnt; | |
414a6295 | 924 | kref_init(&p->kref); |
19172284 TM |
925 | rpc_init_pipe_dir_object(&p->pdo, |
926 | &gss_pipe_dir_object_ops, | |
927 | p); | |
414a6295 | 928 | return p; |
19172284 TM |
929 | err_free_gss_pipe: |
930 | kfree(p); | |
6b2fddd3 | 931 | err: |
19172284 | 932 | return ERR_PTR(err); |
ccdc28f8 SK |
933 | } |
934 | ||
414a6295 TM |
935 | struct gss_alloc_pdo { |
936 | struct rpc_clnt *clnt; | |
937 | const char *name; | |
938 | const struct rpc_pipe_ops *upcall_ops; | |
939 | }; | |
940 | ||
941 | static int gss_pipe_match_pdo(struct rpc_pipe_dir_object *pdo, void *data) | |
942 | { | |
943 | struct gss_pipe *gss_pipe; | |
944 | struct gss_alloc_pdo *args = data; | |
945 | ||
946 | if (pdo->pdo_ops != &gss_pipe_dir_object_ops) | |
947 | return 0; | |
948 | gss_pipe = container_of(pdo, struct gss_pipe, pdo); | |
949 | if (strcmp(gss_pipe->name, args->name) != 0) | |
950 | return 0; | |
951 | if (!kref_get_unless_zero(&gss_pipe->kref)) | |
952 | return 0; | |
953 | return 1; | |
954 | } | |
955 | ||
956 | static struct rpc_pipe_dir_object *gss_pipe_alloc_pdo(void *data) | |
957 | { | |
958 | struct gss_pipe *gss_pipe; | |
959 | struct gss_alloc_pdo *args = data; | |
960 | ||
961 | gss_pipe = gss_pipe_alloc(args->clnt, args->name, args->upcall_ops); | |
962 | if (!IS_ERR(gss_pipe)) | |
963 | return &gss_pipe->pdo; | |
964 | return NULL; | |
965 | } | |
966 | ||
967 | static struct gss_pipe *gss_pipe_get(struct rpc_clnt *clnt, | |
968 | const char *name, | |
969 | const struct rpc_pipe_ops *upcall_ops) | |
970 | { | |
971 | struct net *net = rpc_net_ns(clnt); | |
972 | struct rpc_pipe_dir_object *pdo; | |
973 | struct gss_alloc_pdo args = { | |
974 | .clnt = clnt, | |
975 | .name = name, | |
976 | .upcall_ops = upcall_ops, | |
977 | }; | |
978 | ||
979 | pdo = rpc_find_or_alloc_pipe_dir_object(net, | |
980 | &clnt->cl_pipedir_objects, | |
981 | gss_pipe_match_pdo, | |
982 | gss_pipe_alloc_pdo, | |
983 | &args); | |
984 | if (pdo != NULL) | |
985 | return container_of(pdo, struct gss_pipe, pdo); | |
986 | return ERR_PTR(-ENOMEM); | |
987 | } | |
988 | ||
19172284 | 989 | static void __gss_pipe_free(struct gss_pipe *p) |
ccdc28f8 | 990 | { |
19172284 TM |
991 | struct rpc_clnt *clnt = p->clnt; |
992 | struct net *net = rpc_net_ns(clnt); | |
ccdc28f8 | 993 | |
19172284 TM |
994 | rpc_remove_pipe_dir_object(net, |
995 | &clnt->cl_pipedir_objects, | |
996 | &p->pdo); | |
997 | rpc_destroy_pipe_data(p->pipe); | |
998 | kfree(p); | |
ccdc28f8 SK |
999 | } |
1000 | ||
414a6295 TM |
1001 | static void __gss_pipe_release(struct kref *kref) |
1002 | { | |
1003 | struct gss_pipe *p = container_of(kref, struct gss_pipe, kref); | |
1004 | ||
1005 | __gss_pipe_free(p); | |
1006 | } | |
1007 | ||
19172284 | 1008 | static void gss_pipe_free(struct gss_pipe *p) |
ccdc28f8 | 1009 | { |
19172284 | 1010 | if (p != NULL) |
414a6295 | 1011 | kref_put(&p->kref, __gss_pipe_release); |
ccdc28f8 SK |
1012 | } |
1013 | ||
cca5172a YH |
1014 | /* |
1015 | * NOTE: we have the opportunity to use different | |
1da177e4 LT |
1016 | * parameters based on the input flavor (which must be a pseudoflavor) |
1017 | */ | |
eb6dc19d | 1018 | static struct gss_auth * |
82b98ca5 | 1019 | gss_create_new(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
1da177e4 | 1020 | { |
c2190661 | 1021 | rpc_authflavor_t flavor = args->pseudoflavor; |
1da177e4 | 1022 | struct gss_auth *gss_auth; |
19172284 | 1023 | struct gss_pipe *gss_pipe; |
1da177e4 | 1024 | struct rpc_auth * auth; |
6a19275a | 1025 | int err = -ENOMEM; /* XXX? */ |
1da177e4 | 1026 | |
8885cb36 | 1027 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
1da177e4 LT |
1028 | |
1029 | if (!try_module_get(THIS_MODULE)) | |
6a19275a | 1030 | return ERR_PTR(err); |
1da177e4 LT |
1031 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
1032 | goto out_dec; | |
eb6dc19d | 1033 | INIT_HLIST_NODE(&gss_auth->hash); |
bd4a3eb1 | 1034 | gss_auth->target_name = NULL; |
c2190661 TM |
1035 | if (args->target_name) { |
1036 | gss_auth->target_name = kstrdup(args->target_name, GFP_KERNEL); | |
bd4a3eb1 TM |
1037 | if (gss_auth->target_name == NULL) |
1038 | goto err_free; | |
1039 | } | |
1da177e4 | 1040 | gss_auth->client = clnt; |
e726340a | 1041 | gss_auth->net = get_net(rpc_net_ns(clnt)); |
6a19275a | 1042 | err = -EINVAL; |
1da177e4 LT |
1043 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
1044 | if (!gss_auth->mech) { | |
9b1d75b7 | 1045 | dprintk("RPC: Pseudoflavor %d not found!\n", flavor); |
e726340a | 1046 | goto err_put_net; |
1da177e4 LT |
1047 | } |
1048 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); | |
438b6fde BF |
1049 | if (gss_auth->service == 0) |
1050 | goto err_put_mech; | |
a699d65e TM |
1051 | if (!gssd_running(gss_auth->net)) |
1052 | goto err_put_mech; | |
1da177e4 LT |
1053 | auth = &gss_auth->rpc_auth; |
1054 | auth->au_cslack = GSS_CRED_SLACK >> 2; | |
1055 | auth->au_rslack = GSS_VERF_SLACK >> 2; | |
ce52914e | 1056 | auth->au_flags = 0; |
1da177e4 LT |
1057 | auth->au_ops = &authgss_ops; |
1058 | auth->au_flavor = flavor; | |
65b80179 CL |
1059 | if (gss_pseudoflavor_to_datatouch(gss_auth->mech, flavor)) |
1060 | auth->au_flags |= RPCAUTH_AUTH_DATATOUCH; | |
331bc71c | 1061 | refcount_set(&auth->au_count, 1); |
0285ed1f | 1062 | kref_init(&gss_auth->kref); |
1da177e4 | 1063 | |
19172284 TM |
1064 | err = rpcauth_init_credcache(auth); |
1065 | if (err) | |
1066 | goto err_put_mech; | |
34769fc4 BF |
1067 | /* |
1068 | * Note: if we created the old pipe first, then someone who | |
1069 | * examined the directory at the right moment might conclude | |
1070 | * that we supported only the old pipe. So we instead create | |
1071 | * the new pipe first. | |
1072 | */ | |
414a6295 | 1073 | gss_pipe = gss_pipe_get(clnt, "gssd", &gss_upcall_ops_v1); |
19172284 TM |
1074 | if (IS_ERR(gss_pipe)) { |
1075 | err = PTR_ERR(gss_pipe); | |
1076 | goto err_destroy_credcache; | |
6a19275a | 1077 | } |
19172284 | 1078 | gss_auth->gss_pipe[1] = gss_pipe; |
1da177e4 | 1079 | |
414a6295 | 1080 | gss_pipe = gss_pipe_get(clnt, gss_auth->mech->gm_name, |
19172284 TM |
1081 | &gss_upcall_ops_v0); |
1082 | if (IS_ERR(gss_pipe)) { | |
1083 | err = PTR_ERR(gss_pipe); | |
c239d83b SK |
1084 | goto err_destroy_pipe_1; |
1085 | } | |
19172284 | 1086 | gss_auth->gss_pipe[0] = gss_pipe; |
07a2bf1d | 1087 | |
eb6dc19d | 1088 | return gss_auth; |
c239d83b | 1089 | err_destroy_pipe_1: |
414a6295 | 1090 | gss_pipe_free(gss_auth->gss_pipe[1]); |
19172284 TM |
1091 | err_destroy_credcache: |
1092 | rpcauth_destroy_credcache(auth); | |
1da177e4 LT |
1093 | err_put_mech: |
1094 | gss_mech_put(gss_auth->mech); | |
e726340a TM |
1095 | err_put_net: |
1096 | put_net(gss_auth->net); | |
1da177e4 | 1097 | err_free: |
bd4a3eb1 | 1098 | kfree(gss_auth->target_name); |
1da177e4 LT |
1099 | kfree(gss_auth); |
1100 | out_dec: | |
1101 | module_put(THIS_MODULE); | |
6a19275a | 1102 | return ERR_PTR(err); |
1da177e4 LT |
1103 | } |
1104 | ||
0285ed1f TM |
1105 | static void |
1106 | gss_free(struct gss_auth *gss_auth) | |
1107 | { | |
19172284 TM |
1108 | gss_pipe_free(gss_auth->gss_pipe[0]); |
1109 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
0285ed1f | 1110 | gss_mech_put(gss_auth->mech); |
e726340a | 1111 | put_net(gss_auth->net); |
bd4a3eb1 | 1112 | kfree(gss_auth->target_name); |
0285ed1f TM |
1113 | |
1114 | kfree(gss_auth); | |
1115 | module_put(THIS_MODULE); | |
1116 | } | |
1117 | ||
1118 | static void | |
1119 | gss_free_callback(struct kref *kref) | |
1120 | { | |
1121 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); | |
1122 | ||
1123 | gss_free(gss_auth); | |
1124 | } | |
1125 | ||
9eb2ddb4 TM |
1126 | static void |
1127 | gss_put_auth(struct gss_auth *gss_auth) | |
1128 | { | |
1129 | kref_put(&gss_auth->kref, gss_free_callback); | |
1130 | } | |
1131 | ||
1da177e4 LT |
1132 | static void |
1133 | gss_destroy(struct rpc_auth *auth) | |
1134 | { | |
19172284 TM |
1135 | struct gss_auth *gss_auth = container_of(auth, |
1136 | struct gss_auth, rpc_auth); | |
1da177e4 | 1137 | |
8885cb36 CL |
1138 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
1139 | auth, auth->au_flavor); | |
1da177e4 | 1140 | |
eb6dc19d TM |
1141 | if (hash_hashed(&gss_auth->hash)) { |
1142 | spin_lock(&gss_auth_hash_lock); | |
1143 | hash_del(&gss_auth->hash); | |
1144 | spin_unlock(&gss_auth_hash_lock); | |
1145 | } | |
1146 | ||
19172284 TM |
1147 | gss_pipe_free(gss_auth->gss_pipe[0]); |
1148 | gss_auth->gss_pipe[0] = NULL; | |
1149 | gss_pipe_free(gss_auth->gss_pipe[1]); | |
1150 | gss_auth->gss_pipe[1] = NULL; | |
3ab9bb72 TM |
1151 | rpcauth_destroy_credcache(auth); |
1152 | ||
9eb2ddb4 | 1153 | gss_put_auth(gss_auth); |
1da177e4 LT |
1154 | } |
1155 | ||
a0f6ed8e BF |
1156 | /* |
1157 | * Auths may be shared between rpc clients that were cloned from a | |
1158 | * common client with the same xprt, if they also share the flavor and | |
1159 | * target_name. | |
1160 | * | |
1161 | * The auth is looked up from the oldest parent sharing the same | |
1162 | * cl_xprt, and the auth itself references only that common parent | |
1163 | * (which is guaranteed to last as long as any of its descendants). | |
1164 | */ | |
eb6dc19d | 1165 | static struct gss_auth * |
82b98ca5 | 1166 | gss_auth_find_or_add_hashed(const struct rpc_auth_create_args *args, |
eb6dc19d TM |
1167 | struct rpc_clnt *clnt, |
1168 | struct gss_auth *new) | |
1169 | { | |
1170 | struct gss_auth *gss_auth; | |
1171 | unsigned long hashval = (unsigned long)clnt; | |
1172 | ||
1173 | spin_lock(&gss_auth_hash_lock); | |
1174 | hash_for_each_possible(gss_auth_hash_table, | |
1175 | gss_auth, | |
1176 | hash, | |
1177 | hashval) { | |
a0f6ed8e BF |
1178 | if (gss_auth->client != clnt) |
1179 | continue; | |
eb6dc19d TM |
1180 | if (gss_auth->rpc_auth.au_flavor != args->pseudoflavor) |
1181 | continue; | |
1182 | if (gss_auth->target_name != args->target_name) { | |
1183 | if (gss_auth->target_name == NULL) | |
1184 | continue; | |
1185 | if (args->target_name == NULL) | |
1186 | continue; | |
1187 | if (strcmp(gss_auth->target_name, args->target_name)) | |
1188 | continue; | |
1189 | } | |
331bc71c | 1190 | if (!refcount_inc_not_zero(&gss_auth->rpc_auth.au_count)) |
eb6dc19d TM |
1191 | continue; |
1192 | goto out; | |
1193 | } | |
1194 | if (new) | |
1195 | hash_add(gss_auth_hash_table, &new->hash, hashval); | |
1196 | gss_auth = new; | |
1197 | out: | |
1198 | spin_unlock(&gss_auth_hash_lock); | |
1199 | return gss_auth; | |
1200 | } | |
1201 | ||
1202 | static struct gss_auth * | |
82b98ca5 SD |
1203 | gss_create_hashed(const struct rpc_auth_create_args *args, |
1204 | struct rpc_clnt *clnt) | |
eb6dc19d TM |
1205 | { |
1206 | struct gss_auth *gss_auth; | |
1207 | struct gss_auth *new; | |
1208 | ||
1209 | gss_auth = gss_auth_find_or_add_hashed(args, clnt, NULL); | |
1210 | if (gss_auth != NULL) | |
1211 | goto out; | |
1212 | new = gss_create_new(args, clnt); | |
1213 | if (IS_ERR(new)) | |
1214 | return new; | |
1215 | gss_auth = gss_auth_find_or_add_hashed(args, clnt, new); | |
1216 | if (gss_auth != new) | |
1217 | gss_destroy(&new->rpc_auth); | |
1218 | out: | |
1219 | return gss_auth; | |
1220 | } | |
1221 | ||
1222 | static struct rpc_auth * | |
82b98ca5 | 1223 | gss_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
eb6dc19d TM |
1224 | { |
1225 | struct gss_auth *gss_auth; | |
ad01b2c6 | 1226 | struct rpc_xprt_switch *xps = rcu_access_pointer(clnt->cl_xpi.xpi_xpswitch); |
eb6dc19d TM |
1227 | |
1228 | while (clnt != clnt->cl_parent) { | |
1229 | struct rpc_clnt *parent = clnt->cl_parent; | |
1230 | /* Find the original parent for this transport */ | |
ad01b2c6 | 1231 | if (rcu_access_pointer(parent->cl_xpi.xpi_xpswitch) != xps) |
eb6dc19d TM |
1232 | break; |
1233 | clnt = parent; | |
1234 | } | |
1235 | ||
1236 | gss_auth = gss_create_hashed(args, clnt); | |
1237 | if (IS_ERR(gss_auth)) | |
1238 | return ERR_CAST(gss_auth); | |
1239 | return &gss_auth->rpc_auth; | |
1240 | } | |
1241 | ||
a652a4bc TM |
1242 | static struct gss_cred * |
1243 | gss_dup_cred(struct gss_auth *gss_auth, struct gss_cred *gss_cred) | |
1244 | { | |
1245 | struct gss_cred *new; | |
1246 | ||
1247 | /* Make a copy of the cred so that we can reference count it */ | |
1248 | new = kzalloc(sizeof(*gss_cred), GFP_NOIO); | |
1249 | if (new) { | |
1250 | struct auth_cred acred = { | |
1251 | .uid = gss_cred->gc_base.cr_uid, | |
1252 | }; | |
1253 | struct gss_cl_ctx *ctx = | |
1254 | rcu_dereference_protected(gss_cred->gc_ctx, 1); | |
1255 | ||
1256 | rpcauth_init_cred(&new->gc_base, &acred, | |
1257 | &gss_auth->rpc_auth, | |
1258 | &gss_nullops); | |
1259 | new->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE; | |
1260 | new->gc_service = gss_cred->gc_service; | |
1261 | new->gc_principal = gss_cred->gc_principal; | |
1262 | kref_get(&gss_auth->kref); | |
1263 | rcu_assign_pointer(new->gc_ctx, ctx); | |
1264 | gss_get_ctx(ctx); | |
1265 | } | |
1266 | return new; | |
1267 | } | |
1268 | ||
0df7fb74 | 1269 | /* |
a652a4bc | 1270 | * gss_send_destroy_context will cause the RPCSEC_GSS to send a NULL RPC call |
0df7fb74 TM |
1271 | * to the server with the GSS control procedure field set to |
1272 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release | |
1273 | * all RPCSEC_GSS state associated with that context. | |
1274 | */ | |
a652a4bc TM |
1275 | static void |
1276 | gss_send_destroy_context(struct rpc_cred *cred) | |
0df7fb74 TM |
1277 | { |
1278 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1279 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); | |
c5e6aecd | 1280 | struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1); |
a652a4bc | 1281 | struct gss_cred *new; |
0df7fb74 TM |
1282 | struct rpc_task *task; |
1283 | ||
a652a4bc TM |
1284 | new = gss_dup_cred(gss_auth, gss_cred); |
1285 | if (new) { | |
1286 | ctx->gc_proc = RPC_GSS_PROC_DESTROY; | |
0df7fb74 | 1287 | |
a652a4bc TM |
1288 | task = rpc_call_null(gss_auth->client, &new->gc_base, |
1289 | RPC_TASK_ASYNC|RPC_TASK_SOFT); | |
1290 | if (!IS_ERR(task)) | |
1291 | rpc_put_task(task); | |
0df7fb74 | 1292 | |
a652a4bc TM |
1293 | put_rpccred(&new->gc_base); |
1294 | } | |
0df7fb74 TM |
1295 | } |
1296 | ||
1297 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure | |
1da177e4 LT |
1298 | * to create a new cred or context, so they check that things have been |
1299 | * allocated before freeing them. */ | |
1300 | static void | |
5d28dc82 | 1301 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
1da177e4 | 1302 | { |
632f0d05 | 1303 | dprintk("RPC: %s\n", __func__); |
1da177e4 | 1304 | |
0d8a3746 | 1305 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
1da177e4 | 1306 | kfree(ctx->gc_wire_ctx.data); |
2004c726 | 1307 | kfree(ctx->gc_acceptor.data); |
1da177e4 LT |
1308 | kfree(ctx); |
1309 | } | |
1310 | ||
5d28dc82 TM |
1311 | static void |
1312 | gss_free_ctx_callback(struct rcu_head *head) | |
1313 | { | |
1314 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); | |
1315 | gss_do_free_ctx(ctx); | |
1316 | } | |
1317 | ||
1318 | static void | |
1319 | gss_free_ctx(struct gss_cl_ctx *ctx) | |
1320 | { | |
1321 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); | |
1322 | } | |
1323 | ||
1da177e4 | 1324 | static void |
31be5bf1 | 1325 | gss_free_cred(struct gss_cred *gss_cred) |
1da177e4 | 1326 | { |
632f0d05 | 1327 | dprintk("RPC: %s cred=%p\n", __func__, gss_cred); |
31be5bf1 TM |
1328 | kfree(gss_cred); |
1329 | } | |
1da177e4 | 1330 | |
31be5bf1 TM |
1331 | static void |
1332 | gss_free_cred_callback(struct rcu_head *head) | |
1333 | { | |
1334 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); | |
1335 | gss_free_cred(gss_cred); | |
1336 | } | |
1da177e4 | 1337 | |
31be5bf1 | 1338 | static void |
6dcd3926 | 1339 | gss_destroy_nullcred(struct rpc_cred *cred) |
31be5bf1 | 1340 | { |
5d28dc82 | 1341 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
0285ed1f | 1342 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
c5e6aecd | 1343 | struct gss_cl_ctx *ctx = rcu_dereference_protected(gss_cred->gc_ctx, 1); |
5d28dc82 | 1344 | |
a9b3cd7f | 1345 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
31be5bf1 | 1346 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
5d28dc82 TM |
1347 | if (ctx) |
1348 | gss_put_ctx(ctx); | |
9eb2ddb4 | 1349 | gss_put_auth(gss_auth); |
1da177e4 LT |
1350 | } |
1351 | ||
6dcd3926 JL |
1352 | static void |
1353 | gss_destroy_cred(struct rpc_cred *cred) | |
1354 | { | |
1355 | ||
a652a4bc TM |
1356 | if (test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) |
1357 | gss_send_destroy_context(cred); | |
6dcd3926 JL |
1358 | gss_destroy_nullcred(cred); |
1359 | } | |
1360 | ||
a960f8d6 FS |
1361 | static int |
1362 | gss_hash_cred(struct auth_cred *acred, unsigned int hashbits) | |
1363 | { | |
1364 | return hash_64(from_kuid(&init_user_ns, acred->uid), hashbits); | |
1365 | } | |
1366 | ||
1da177e4 LT |
1367 | /* |
1368 | * Lookup RPCSEC_GSS cred for the current process | |
1369 | */ | |
1370 | static struct rpc_cred * | |
8a317760 | 1371 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
1da177e4 | 1372 | { |
3c6e0bc8 | 1373 | return rpcauth_lookup_credcache(auth, acred, flags, GFP_NOFS); |
1da177e4 LT |
1374 | } |
1375 | ||
1376 | static struct rpc_cred * | |
3c6e0bc8 | 1377 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, gfp_t gfp) |
1da177e4 LT |
1378 | { |
1379 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1380 | struct gss_cred *cred = NULL; | |
1381 | int err = -ENOMEM; | |
1382 | ||
632f0d05 | 1383 | dprintk("RPC: %s for uid %d, flavor %d\n", |
cdba321e EB |
1384 | __func__, from_kuid(&init_user_ns, acred->uid), |
1385 | auth->au_flavor); | |
1da177e4 | 1386 | |
3c6e0bc8 | 1387 | if (!(cred = kzalloc(sizeof(*cred), gfp))) |
1da177e4 LT |
1388 | goto out_err; |
1389 | ||
5fe4755e | 1390 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
1da177e4 LT |
1391 | /* |
1392 | * Note: in order to force a call to call_refresh(), we deliberately | |
1393 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. | |
1394 | */ | |
fc432dd9 | 1395 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
1da177e4 | 1396 | cred->gc_service = gss_auth->service; |
68c97153 TM |
1397 | cred->gc_principal = NULL; |
1398 | if (acred->machine_cred) | |
1399 | cred->gc_principal = acred->principal; | |
0285ed1f | 1400 | kref_get(&gss_auth->kref); |
1da177e4 LT |
1401 | return &cred->gc_base; |
1402 | ||
1403 | out_err: | |
632f0d05 | 1404 | dprintk("RPC: %s failed with error %d\n", __func__, err); |
1da177e4 LT |
1405 | return ERR_PTR(err); |
1406 | } | |
1407 | ||
fba3bad4 TM |
1408 | static int |
1409 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) | |
1410 | { | |
1411 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); | |
1412 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); | |
1413 | int err; | |
1414 | ||
1415 | do { | |
1416 | err = gss_create_upcall(gss_auth, gss_cred); | |
1417 | } while (err == -EAGAIN); | |
1418 | return err; | |
1419 | } | |
1420 | ||
a0337d1d JL |
1421 | static char * |
1422 | gss_stringify_acceptor(struct rpc_cred *cred) | |
1423 | { | |
c5e6aecd | 1424 | char *string = NULL; |
a0337d1d | 1425 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
c5e6aecd | 1426 | struct gss_cl_ctx *ctx; |
b3ecba09 | 1427 | unsigned int len; |
c5e6aecd JL |
1428 | struct xdr_netobj *acceptor; |
1429 | ||
1430 | rcu_read_lock(); | |
1431 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
1432 | if (!ctx) | |
1433 | goto out; | |
1434 | ||
b3ecba09 JL |
1435 | len = ctx->gc_acceptor.len; |
1436 | rcu_read_unlock(); | |
a0337d1d JL |
1437 | |
1438 | /* no point if there's no string */ | |
b3ecba09 JL |
1439 | if (!len) |
1440 | return NULL; | |
1441 | realloc: | |
1442 | string = kmalloc(len + 1, GFP_KERNEL); | |
a0337d1d | 1443 | if (!string) |
b3ecba09 JL |
1444 | return NULL; |
1445 | ||
1446 | rcu_read_lock(); | |
1447 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
1448 | ||
1449 | /* did the ctx disappear or was it replaced by one with no acceptor? */ | |
1450 | if (!ctx || !ctx->gc_acceptor.len) { | |
1451 | kfree(string); | |
1452 | string = NULL; | |
c5e6aecd | 1453 | goto out; |
b3ecba09 JL |
1454 | } |
1455 | ||
1456 | acceptor = &ctx->gc_acceptor; | |
1457 | ||
1458 | /* | |
1459 | * Did we find a new acceptor that's longer than the original? Allocate | |
1460 | * a longer buffer and try again. | |
1461 | */ | |
1462 | if (len < acceptor->len) { | |
1463 | len = acceptor->len; | |
1464 | rcu_read_unlock(); | |
1465 | kfree(string); | |
1466 | goto realloc; | |
1467 | } | |
a0337d1d JL |
1468 | |
1469 | memcpy(string, acceptor->data, acceptor->len); | |
1470 | string[acceptor->len] = '\0'; | |
c5e6aecd JL |
1471 | out: |
1472 | rcu_read_unlock(); | |
a0337d1d JL |
1473 | return string; |
1474 | } | |
1475 | ||
4de6caa2 AA |
1476 | /* |
1477 | * Returns -EACCES if GSS context is NULL or will expire within the | |
1478 | * timeout (miliseconds) | |
1479 | */ | |
1480 | static int | |
1481 | gss_key_timeout(struct rpc_cred *rc) | |
1482 | { | |
1483 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
c5e6aecd | 1484 | struct gss_cl_ctx *ctx; |
cc6a7aab AB |
1485 | unsigned long timeout = jiffies + (gss_key_expire_timeo * HZ); |
1486 | int ret = 0; | |
4de6caa2 | 1487 | |
c5e6aecd JL |
1488 | rcu_read_lock(); |
1489 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
cc6a7aab AB |
1490 | if (!ctx || time_after(timeout, ctx->gc_expiry)) |
1491 | ret = -EACCES; | |
c5e6aecd | 1492 | rcu_read_unlock(); |
cc6a7aab AB |
1493 | |
1494 | return ret; | |
4de6caa2 AA |
1495 | } |
1496 | ||
1da177e4 | 1497 | static int |
8a317760 | 1498 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
1da177e4 LT |
1499 | { |
1500 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); | |
c5e6aecd | 1501 | struct gss_cl_ctx *ctx; |
4de6caa2 | 1502 | int ret; |
1da177e4 | 1503 | |
cd019f75 | 1504 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
8a317760 | 1505 | goto out; |
1da177e4 | 1506 | /* Don't match with creds that have expired. */ |
c5e6aecd JL |
1507 | rcu_read_lock(); |
1508 | ctx = rcu_dereference(gss_cred->gc_ctx); | |
1509 | if (!ctx || time_after(jiffies, ctx->gc_expiry)) { | |
1510 | rcu_read_unlock(); | |
cd019f75 | 1511 | return 0; |
c5e6aecd JL |
1512 | } |
1513 | rcu_read_unlock(); | |
cd019f75 | 1514 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) |
1da177e4 | 1515 | return 0; |
8a317760 | 1516 | out: |
68c97153 TM |
1517 | if (acred->principal != NULL) { |
1518 | if (gss_cred->gc_principal == NULL) | |
1519 | return 0; | |
4de6caa2 AA |
1520 | ret = strcmp(acred->principal, gss_cred->gc_principal) == 0; |
1521 | goto check_expire; | |
68c97153 TM |
1522 | } |
1523 | if (gss_cred->gc_principal != NULL) | |
7c67db3a | 1524 | return 0; |
4de6caa2 AA |
1525 | ret = uid_eq(rc->cr_uid, acred->uid); |
1526 | ||
1527 | check_expire: | |
1528 | if (ret == 0) | |
1529 | return ret; | |
1530 | ||
1531 | /* Notify acred users of GSS context expiration timeout */ | |
1532 | if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) && | |
1533 | (gss_key_timeout(rc) != 0)) { | |
1534 | /* test will now be done from generic cred */ | |
1535 | test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags); | |
1536 | /* tell NFS layer that key will expire soon */ | |
1537 | set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags); | |
1538 | } | |
1539 | return ret; | |
1da177e4 LT |
1540 | } |
1541 | ||
1542 | /* | |
1543 | * Marshal credentials. | |
1544 | * Maybe we should keep a cached credential for performance reasons. | |
1545 | */ | |
d8ed029d AD |
1546 | static __be32 * |
1547 | gss_marshal(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1548 | { |
a17c2153 TM |
1549 | struct rpc_rqst *req = task->tk_rqstp; |
1550 | struct rpc_cred *cred = req->rq_cred; | |
1da177e4 LT |
1551 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1552 | gc_base); | |
1553 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 1554 | __be32 *cred_len; |
1da177e4 LT |
1555 | u32 maj_stat = 0; |
1556 | struct xdr_netobj mic; | |
1557 | struct kvec iov; | |
1558 | struct xdr_buf verf_buf; | |
1559 | ||
632f0d05 | 1560 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1561 | |
1562 | *p++ = htonl(RPC_AUTH_GSS); | |
1563 | cred_len = p++; | |
1564 | ||
1565 | spin_lock(&ctx->gc_seq_lock); | |
1566 | req->rq_seqno = ctx->gc_seq++; | |
1567 | spin_unlock(&ctx->gc_seq_lock); | |
1568 | ||
1569 | *p++ = htonl((u32) RPC_GSS_VERSION); | |
1570 | *p++ = htonl((u32) ctx->gc_proc); | |
1571 | *p++ = htonl((u32) req->rq_seqno); | |
1572 | *p++ = htonl((u32) gss_cred->gc_service); | |
1573 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); | |
1574 | *cred_len = htonl((p - (cred_len + 1)) << 2); | |
1575 | ||
1576 | /* We compute the checksum for the verifier over the xdr-encoded bytes | |
1577 | * starting with the xid and ending at the end of the credential: */ | |
a4f0835c | 1578 | iov.iov_base = xprt_skip_transport_header(req->rq_xprt, |
808012fb | 1579 | req->rq_snd_buf.head[0].iov_base); |
1da177e4 LT |
1580 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
1581 | xdr_buf_from_iov(&iov, &verf_buf); | |
1582 | ||
1583 | /* set verifier flavor*/ | |
1584 | *p++ = htonl(RPC_AUTH_GSS); | |
1585 | ||
1586 | mic.data = (u8 *)(p + 1); | |
00fd6e14 | 1587 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1588 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
fc432dd9 | 1589 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1590 | } else if (maj_stat != 0) { |
1591 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); | |
1592 | goto out_put_ctx; | |
1593 | } | |
1594 | p = xdr_encode_opaque(p, NULL, mic.len); | |
1595 | gss_put_ctx(ctx); | |
1596 | return p; | |
1597 | out_put_ctx: | |
1598 | gss_put_ctx(ctx); | |
1599 | return NULL; | |
1600 | } | |
1601 | ||
cd019f75 TM |
1602 | static int gss_renew_cred(struct rpc_task *task) |
1603 | { | |
a17c2153 | 1604 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1605 | struct gss_cred *gss_cred = container_of(oldcred, |
1606 | struct gss_cred, | |
1607 | gc_base); | |
1608 | struct rpc_auth *auth = oldcred->cr_auth; | |
1609 | struct auth_cred acred = { | |
1610 | .uid = oldcred->cr_uid, | |
68c97153 TM |
1611 | .principal = gss_cred->gc_principal, |
1612 | .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), | |
cd019f75 TM |
1613 | }; |
1614 | struct rpc_cred *new; | |
1615 | ||
1616 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); | |
1617 | if (IS_ERR(new)) | |
1618 | return PTR_ERR(new); | |
a17c2153 | 1619 | task->tk_rqstp->rq_cred = new; |
cd019f75 TM |
1620 | put_rpccred(oldcred); |
1621 | return 0; | |
1622 | } | |
1623 | ||
126e216a TM |
1624 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
1625 | { | |
1626 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { | |
1627 | unsigned long now = jiffies; | |
1628 | unsigned long begin, expire; | |
8fdee4cc | 1629 | struct gss_cred *gss_cred; |
126e216a TM |
1630 | |
1631 | gss_cred = container_of(cred, struct gss_cred, gc_base); | |
1632 | begin = gss_cred->gc_upcall_timestamp; | |
1633 | expire = begin + gss_expired_cred_retry_delay * HZ; | |
1634 | ||
1635 | if (time_in_range_open(now, begin, expire)) | |
1636 | return 1; | |
1637 | } | |
1638 | return 0; | |
1639 | } | |
1640 | ||
1da177e4 LT |
1641 | /* |
1642 | * Refresh credentials. XXX - finish | |
1643 | */ | |
1644 | static int | |
1645 | gss_refresh(struct rpc_task *task) | |
1646 | { | |
a17c2153 | 1647 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
cd019f75 TM |
1648 | int ret = 0; |
1649 | ||
126e216a TM |
1650 | if (gss_cred_is_negative_entry(cred)) |
1651 | return -EKEYEXPIRED; | |
1652 | ||
cd019f75 TM |
1653 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
1654 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { | |
1655 | ret = gss_renew_cred(task); | |
1656 | if (ret < 0) | |
1657 | goto out; | |
a17c2153 | 1658 | cred = task->tk_rqstp->rq_cred; |
cd019f75 | 1659 | } |
1da177e4 | 1660 | |
cd019f75 TM |
1661 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
1662 | ret = gss_refresh_upcall(task); | |
1663 | out: | |
1664 | return ret; | |
1da177e4 LT |
1665 | } |
1666 | ||
0df7fb74 TM |
1667 | /* Dummy refresh routine: used only when destroying the context */ |
1668 | static int | |
1669 | gss_refresh_null(struct rpc_task *task) | |
1670 | { | |
c297c8b9 | 1671 | return 0; |
0df7fb74 TM |
1672 | } |
1673 | ||
d8ed029d AD |
1674 | static __be32 * |
1675 | gss_validate(struct rpc_task *task, __be32 *p) | |
1da177e4 | 1676 | { |
a17c2153 | 1677 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 | 1678 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
2876a344 | 1679 | __be32 *seq = NULL; |
1da177e4 LT |
1680 | struct kvec iov; |
1681 | struct xdr_buf verf_buf; | |
1682 | struct xdr_netobj mic; | |
1683 | u32 flav,len; | |
1684 | u32 maj_stat; | |
35fa5f7b | 1685 | __be32 *ret = ERR_PTR(-EIO); |
1da177e4 | 1686 | |
632f0d05 | 1687 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1688 | |
1689 | flav = ntohl(*p++); | |
1690 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) | |
cca5172a | 1691 | goto out_bad; |
1da177e4 LT |
1692 | if (flav != RPC_AUTH_GSS) |
1693 | goto out_bad; | |
2876a344 BF |
1694 | seq = kmalloc(4, GFP_NOFS); |
1695 | if (!seq) | |
1696 | goto out_bad; | |
1697 | *seq = htonl(task->tk_rqstp->rq_seqno); | |
1698 | iov.iov_base = seq; | |
1699 | iov.iov_len = 4; | |
1da177e4 LT |
1700 | xdr_buf_from_iov(&iov, &verf_buf); |
1701 | mic.data = (u8 *)p; | |
1702 | mic.len = len; | |
1703 | ||
35fa5f7b | 1704 | ret = ERR_PTR(-EACCES); |
00fd6e14 | 1705 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
1da177e4 | 1706 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1707 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
0df7fb74 | 1708 | if (maj_stat) { |
632f0d05 CL |
1709 | dprintk("RPC: %5u %s: gss_verify_mic returned error 0x%08x\n", |
1710 | task->tk_pid, __func__, maj_stat); | |
1da177e4 | 1711 | goto out_bad; |
0df7fb74 | 1712 | } |
24b2605b BF |
1713 | /* We leave it to unwrap to calculate au_rslack. For now we just |
1714 | * calculate the length of the verifier: */ | |
1be27f36 | 1715 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
1da177e4 | 1716 | gss_put_ctx(ctx); |
632f0d05 CL |
1717 | dprintk("RPC: %5u %s: gss_verify_mic succeeded.\n", |
1718 | task->tk_pid, __func__); | |
2876a344 | 1719 | kfree(seq); |
1da177e4 LT |
1720 | return p + XDR_QUADLEN(len); |
1721 | out_bad: | |
1722 | gss_put_ctx(ctx); | |
35fa5f7b AA |
1723 | dprintk("RPC: %5u %s failed ret %ld.\n", task->tk_pid, __func__, |
1724 | PTR_ERR(ret)); | |
2876a344 | 1725 | kfree(seq); |
35fa5f7b | 1726 | return ret; |
1da177e4 LT |
1727 | } |
1728 | ||
9f06c719 CL |
1729 | static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
1730 | __be32 *p, void *obj) | |
1731 | { | |
1732 | struct xdr_stream xdr; | |
1733 | ||
1734 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); | |
1735 | encode(rqstp, &xdr, obj); | |
1736 | } | |
1737 | ||
1da177e4 LT |
1738 | static inline int |
1739 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1740 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1741 | __be32 *p, void *obj) | |
1da177e4 LT |
1742 | { |
1743 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1744 | struct xdr_buf integ_buf; | |
d8ed029d | 1745 | __be32 *integ_len = NULL; |
1da177e4 | 1746 | struct xdr_netobj mic; |
d8ed029d AD |
1747 | u32 offset; |
1748 | __be32 *q; | |
1da177e4 LT |
1749 | struct kvec *iov; |
1750 | u32 maj_stat = 0; | |
1751 | int status = -EIO; | |
1752 | ||
1753 | integ_len = p++; | |
1754 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1755 | *p++ = htonl(rqstp->rq_seqno); | |
1756 | ||
9f06c719 | 1757 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1da177e4 LT |
1758 | |
1759 | if (xdr_buf_subsegment(snd_buf, &integ_buf, | |
1760 | offset, snd_buf->len - offset)) | |
1761 | return status; | |
1762 | *integ_len = htonl(integ_buf.len); | |
1763 | ||
1764 | /* guess whether we're in the head or the tail: */ | |
cca5172a | 1765 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
1da177e4 LT |
1766 | iov = snd_buf->tail; |
1767 | else | |
1768 | iov = snd_buf->head; | |
1769 | p = iov->iov_base + iov->iov_len; | |
1770 | mic.data = (u8 *)(p + 1); | |
1771 | ||
00fd6e14 | 1772 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 LT |
1773 | status = -EIO; /* XXX? */ |
1774 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1775 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1776 | else if (maj_stat) |
1777 | return status; | |
1778 | q = xdr_encode_opaque(p, NULL, mic.len); | |
1779 | ||
1780 | offset = (u8 *)q - (u8 *)p; | |
1781 | iov->iov_len += offset; | |
1782 | snd_buf->len += offset; | |
1783 | return 0; | |
1784 | } | |
1785 | ||
2d2da60c BF |
1786 | static void |
1787 | priv_release_snd_buf(struct rpc_rqst *rqstp) | |
1788 | { | |
1789 | int i; | |
1790 | ||
1791 | for (i=0; i < rqstp->rq_enc_pages_num; i++) | |
1792 | __free_page(rqstp->rq_enc_pages[i]); | |
1793 | kfree(rqstp->rq_enc_pages); | |
8dae5398 | 1794 | rqstp->rq_release_snd_buf = NULL; |
2d2da60c BF |
1795 | } |
1796 | ||
1797 | static int | |
1798 | alloc_enc_pages(struct rpc_rqst *rqstp) | |
1799 | { | |
1800 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1801 | int first, last, i; | |
1802 | ||
8dae5398 CL |
1803 | if (rqstp->rq_release_snd_buf) |
1804 | rqstp->rq_release_snd_buf(rqstp); | |
1805 | ||
2d2da60c BF |
1806 | if (snd_buf->page_len == 0) { |
1807 | rqstp->rq_enc_pages_num = 0; | |
1808 | return 0; | |
1809 | } | |
1810 | ||
09cbfeaf KS |
1811 | first = snd_buf->page_base >> PAGE_SHIFT; |
1812 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_SHIFT; | |
2d2da60c BF |
1813 | rqstp->rq_enc_pages_num = last - first + 1 + 1; |
1814 | rqstp->rq_enc_pages | |
6da2ec56 KC |
1815 | = kmalloc_array(rqstp->rq_enc_pages_num, |
1816 | sizeof(struct page *), | |
2d2da60c BF |
1817 | GFP_NOFS); |
1818 | if (!rqstp->rq_enc_pages) | |
1819 | goto out; | |
1820 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { | |
1821 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); | |
1822 | if (rqstp->rq_enc_pages[i] == NULL) | |
1823 | goto out_free; | |
1824 | } | |
1825 | rqstp->rq_release_snd_buf = priv_release_snd_buf; | |
1826 | return 0; | |
1827 | out_free: | |
cdead7cf TM |
1828 | rqstp->rq_enc_pages_num = i; |
1829 | priv_release_snd_buf(rqstp); | |
2d2da60c BF |
1830 | out: |
1831 | return -EAGAIN; | |
1832 | } | |
1833 | ||
1834 | static inline int | |
1835 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
9f06c719 CL |
1836 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
1837 | __be32 *p, void *obj) | |
2d2da60c BF |
1838 | { |
1839 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; | |
1840 | u32 offset; | |
1841 | u32 maj_stat; | |
1842 | int status; | |
d8ed029d | 1843 | __be32 *opaque_len; |
2d2da60c BF |
1844 | struct page **inpages; |
1845 | int first; | |
1846 | int pad; | |
1847 | struct kvec *iov; | |
1848 | char *tmp; | |
1849 | ||
1850 | opaque_len = p++; | |
1851 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; | |
1852 | *p++ = htonl(rqstp->rq_seqno); | |
1853 | ||
9f06c719 | 1854 | gss_wrap_req_encode(encode, rqstp, p, obj); |
2d2da60c BF |
1855 | |
1856 | status = alloc_enc_pages(rqstp); | |
1857 | if (status) | |
1858 | return status; | |
09cbfeaf | 1859 | first = snd_buf->page_base >> PAGE_SHIFT; |
2d2da60c BF |
1860 | inpages = snd_buf->pages + first; |
1861 | snd_buf->pages = rqstp->rq_enc_pages; | |
09cbfeaf | 1862 | snd_buf->page_base -= first << PAGE_SHIFT; |
7561042f KC |
1863 | /* |
1864 | * Give the tail its own page, in case we need extra space in the | |
1865 | * head when wrapping: | |
1866 | * | |
1867 | * call_allocate() allocates twice the slack space required | |
1868 | * by the authentication flavor to rq_callsize. | |
1869 | * For GSS, slack is GSS_CRED_SLACK. | |
1870 | */ | |
2d2da60c BF |
1871 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
1872 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); | |
1873 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); | |
1874 | snd_buf->tail[0].iov_base = tmp; | |
1875 | } | |
00fd6e14 | 1876 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
7561042f | 1877 | /* slack space should prevent this ever happening: */ |
2d2da60c | 1878 | BUG_ON(snd_buf->len > snd_buf->buflen); |
cca5172a | 1879 | status = -EIO; |
2d2da60c BF |
1880 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
1881 | * done anyway, so it's safe to put the request on the wire: */ | |
1882 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) | |
fc432dd9 | 1883 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1884 | else if (maj_stat) |
1885 | return status; | |
1886 | ||
1887 | *opaque_len = htonl(snd_buf->len - offset); | |
1888 | /* guess whether we're in the head or the tail: */ | |
1889 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) | |
1890 | iov = snd_buf->tail; | |
1891 | else | |
1892 | iov = snd_buf->head; | |
1893 | p = iov->iov_base + iov->iov_len; | |
1894 | pad = 3 - ((snd_buf->len - offset - 1) & 3); | |
1895 | memset(p, 0, pad); | |
1896 | iov->iov_len += pad; | |
1897 | snd_buf->len += pad; | |
1898 | ||
1899 | return 0; | |
1900 | } | |
1901 | ||
1da177e4 LT |
1902 | static int |
1903 | gss_wrap_req(struct rpc_task *task, | |
9f06c719 | 1904 | kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 1905 | { |
a17c2153 | 1906 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
1907 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
1908 | gc_base); | |
1909 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
1910 | int status = -EIO; | |
1911 | ||
632f0d05 | 1912 | dprintk("RPC: %5u %s\n", task->tk_pid, __func__); |
1da177e4 LT |
1913 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
1914 | /* The spec seems a little ambiguous here, but I think that not | |
1915 | * wrapping context destruction requests makes the most sense. | |
1916 | */ | |
9f06c719 CL |
1917 | gss_wrap_req_encode(encode, rqstp, p, obj); |
1918 | status = 0; | |
1da177e4 LT |
1919 | goto out; |
1920 | } | |
1921 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
1922 | case RPC_GSS_SVC_NONE: |
1923 | gss_wrap_req_encode(encode, rqstp, p, obj); | |
1924 | status = 0; | |
1925 | break; | |
1926 | case RPC_GSS_SVC_INTEGRITY: | |
1927 | status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); | |
1928 | break; | |
1929 | case RPC_GSS_SVC_PRIVACY: | |
1930 | status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); | |
1931 | break; | |
1da177e4 LT |
1932 | } |
1933 | out: | |
1934 | gss_put_ctx(ctx); | |
632f0d05 | 1935 | dprintk("RPC: %5u %s returning %d\n", task->tk_pid, __func__, status); |
1da177e4 LT |
1936 | return status; |
1937 | } | |
1938 | ||
1939 | static inline int | |
1940 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1941 | struct rpc_rqst *rqstp, __be32 **p) |
1da177e4 LT |
1942 | { |
1943 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1944 | struct xdr_buf integ_buf; | |
1945 | struct xdr_netobj mic; | |
1946 | u32 data_offset, mic_offset; | |
1947 | u32 integ_len; | |
1948 | u32 maj_stat; | |
1949 | int status = -EIO; | |
1950 | ||
1951 | integ_len = ntohl(*(*p)++); | |
1952 | if (integ_len & 3) | |
1953 | return status; | |
1954 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1955 | mic_offset = integ_len + data_offset; | |
1956 | if (mic_offset > rcv_buf->len) | |
1957 | return status; | |
1958 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1959 | return status; | |
1960 | ||
1961 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, | |
1962 | mic_offset - data_offset)) | |
1963 | return status; | |
1964 | ||
1965 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) | |
1966 | return status; | |
1967 | ||
00fd6e14 | 1968 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
1da177e4 | 1969 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1970 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
1da177e4 LT |
1971 | if (maj_stat != GSS_S_COMPLETE) |
1972 | return status; | |
1973 | return 0; | |
1974 | } | |
1975 | ||
2d2da60c BF |
1976 | static inline int |
1977 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, | |
d8ed029d | 1978 | struct rpc_rqst *rqstp, __be32 **p) |
2d2da60c BF |
1979 | { |
1980 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; | |
1981 | u32 offset; | |
1982 | u32 opaque_len; | |
1983 | u32 maj_stat; | |
1984 | int status = -EIO; | |
1985 | ||
1986 | opaque_len = ntohl(*(*p)++); | |
1987 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; | |
1988 | if (offset + opaque_len > rcv_buf->len) | |
1989 | return status; | |
1990 | /* remove padding: */ | |
1991 | rcv_buf->len = offset + opaque_len; | |
1992 | ||
00fd6e14 | 1993 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
2d2da60c | 1994 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
fc432dd9 | 1995 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
2d2da60c BF |
1996 | if (maj_stat != GSS_S_COMPLETE) |
1997 | return status; | |
1998 | if (ntohl(*(*p)++) != rqstp->rq_seqno) | |
1999 | return status; | |
2000 | ||
2001 | return 0; | |
2002 | } | |
2003 | ||
bf269551 CL |
2004 | static int |
2005 | gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, | |
2006 | __be32 *p, void *obj) | |
2007 | { | |
2008 | struct xdr_stream xdr; | |
2009 | ||
2010 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
2011 | return decode(rqstp, &xdr, obj); | |
2012 | } | |
2d2da60c | 2013 | |
3021a5bb TM |
2014 | static bool |
2015 | gss_seq_is_newer(u32 new, u32 old) | |
2016 | { | |
2017 | return (s32)(new - old) > 0; | |
2018 | } | |
2019 | ||
2020 | static bool | |
2021 | gss_xmit_need_reencode(struct rpc_task *task) | |
2022 | { | |
2023 | struct rpc_rqst *req = task->tk_rqstp; | |
2024 | struct rpc_cred *cred = req->rq_cred; | |
2025 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
2026 | u32 win, seq_xmit; | |
2027 | bool ret = true; | |
2028 | ||
2029 | if (!ctx) | |
2030 | return true; | |
2031 | ||
2032 | if (gss_seq_is_newer(req->rq_seqno, READ_ONCE(ctx->gc_seq))) | |
2033 | goto out; | |
2034 | ||
2035 | seq_xmit = READ_ONCE(ctx->gc_seq_xmit); | |
2036 | while (gss_seq_is_newer(req->rq_seqno, seq_xmit)) { | |
2037 | u32 tmp = seq_xmit; | |
2038 | ||
2039 | seq_xmit = cmpxchg(&ctx->gc_seq_xmit, tmp, req->rq_seqno); | |
2040 | if (seq_xmit == tmp) { | |
2041 | ret = false; | |
2042 | goto out; | |
2043 | } | |
2044 | } | |
2045 | ||
2046 | win = ctx->gc_win; | |
2047 | if (win > 0) | |
2048 | ret = !gss_seq_is_newer(req->rq_seqno, seq_xmit - win); | |
2049 | out: | |
2050 | gss_put_ctx(ctx); | |
2051 | return ret; | |
2052 | } | |
2053 | ||
1da177e4 LT |
2054 | static int |
2055 | gss_unwrap_resp(struct rpc_task *task, | |
bf269551 | 2056 | kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) |
1da177e4 | 2057 | { |
a17c2153 | 2058 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
1da177e4 LT |
2059 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
2060 | gc_base); | |
2061 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); | |
d8ed029d | 2062 | __be32 *savedp = p; |
2d2da60c BF |
2063 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
2064 | int savedlen = head->iov_len; | |
1da177e4 LT |
2065 | int status = -EIO; |
2066 | ||
2067 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) | |
2068 | goto out_decode; | |
2069 | switch (gss_cred->gc_service) { | |
89f0e4fe JP |
2070 | case RPC_GSS_SVC_NONE: |
2071 | break; | |
2072 | case RPC_GSS_SVC_INTEGRITY: | |
2073 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); | |
2074 | if (status) | |
2075 | goto out; | |
2076 | break; | |
2077 | case RPC_GSS_SVC_PRIVACY: | |
2078 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); | |
2079 | if (status) | |
2080 | goto out; | |
2081 | break; | |
1da177e4 | 2082 | } |
24b2605b | 2083 | /* take into account extra slack for integrity and privacy cases: */ |
1be27f36 | 2084 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
2d2da60c | 2085 | + (savedlen - head->iov_len); |
1da177e4 | 2086 | out_decode: |
bf269551 | 2087 | status = gss_unwrap_req_decode(decode, rqstp, p, obj); |
1da177e4 LT |
2088 | out: |
2089 | gss_put_ctx(ctx); | |
632f0d05 CL |
2090 | dprintk("RPC: %5u %s returning %d\n", |
2091 | task->tk_pid, __func__, status); | |
1da177e4 LT |
2092 | return status; |
2093 | } | |
cca5172a | 2094 | |
f1c0a861 | 2095 | static const struct rpc_authops authgss_ops = { |
1da177e4 LT |
2096 | .owner = THIS_MODULE, |
2097 | .au_flavor = RPC_AUTH_GSS, | |
1da177e4 | 2098 | .au_name = "RPCSEC_GSS", |
1da177e4 LT |
2099 | .create = gss_create, |
2100 | .destroy = gss_destroy, | |
a960f8d6 | 2101 | .hash_cred = gss_hash_cred, |
1da177e4 | 2102 | .lookup_cred = gss_lookup_cred, |
80df9d20 | 2103 | .crcreate = gss_create_cred, |
6a1a1e34 | 2104 | .list_pseudoflavors = gss_mech_list_pseudoflavors, |
9568c5e9 | 2105 | .info2flavor = gss_mech_info2flavor, |
a77c806f | 2106 | .flavor2info = gss_mech_flavor2info, |
1da177e4 LT |
2107 | }; |
2108 | ||
f1c0a861 | 2109 | static const struct rpc_credops gss_credops = { |
a0337d1d JL |
2110 | .cr_name = "AUTH_GSS", |
2111 | .crdestroy = gss_destroy_cred, | |
2112 | .cr_init = gss_cred_init, | |
2113 | .crbind = rpcauth_generic_bind_cred, | |
2114 | .crmatch = gss_match, | |
2115 | .crmarshal = gss_marshal, | |
2116 | .crrefresh = gss_refresh, | |
2117 | .crvalidate = gss_validate, | |
2118 | .crwrap_req = gss_wrap_req, | |
2119 | .crunwrap_resp = gss_unwrap_resp, | |
2120 | .crkey_timeout = gss_key_timeout, | |
2121 | .crstringify_acceptor = gss_stringify_acceptor, | |
3021a5bb | 2122 | .crneed_reencode = gss_xmit_need_reencode, |
1da177e4 LT |
2123 | }; |
2124 | ||
0df7fb74 | 2125 | static const struct rpc_credops gss_nullops = { |
a0337d1d JL |
2126 | .cr_name = "AUTH_GSS", |
2127 | .crdestroy = gss_destroy_nullcred, | |
2128 | .crbind = rpcauth_generic_bind_cred, | |
2129 | .crmatch = gss_match, | |
2130 | .crmarshal = gss_marshal, | |
2131 | .crrefresh = gss_refresh_null, | |
2132 | .crvalidate = gss_validate, | |
2133 | .crwrap_req = gss_wrap_req, | |
2134 | .crunwrap_resp = gss_unwrap_resp, | |
2135 | .crstringify_acceptor = gss_stringify_acceptor, | |
0df7fb74 TM |
2136 | }; |
2137 | ||
b693ba4a | 2138 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
c1225158 | 2139 | .upcall = rpc_pipe_generic_upcall, |
34769fc4 BF |
2140 | .downcall = gss_pipe_downcall, |
2141 | .destroy_msg = gss_pipe_destroy_msg, | |
2142 | .open_pipe = gss_pipe_open_v0, | |
2143 | .release_pipe = gss_pipe_release, | |
2144 | }; | |
2145 | ||
b693ba4a | 2146 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
c1225158 | 2147 | .upcall = rpc_pipe_generic_upcall, |
1da177e4 LT |
2148 | .downcall = gss_pipe_downcall, |
2149 | .destroy_msg = gss_pipe_destroy_msg, | |
34769fc4 | 2150 | .open_pipe = gss_pipe_open_v1, |
1da177e4 LT |
2151 | .release_pipe = gss_pipe_release, |
2152 | }; | |
2153 | ||
a1db410d SK |
2154 | static __net_init int rpcsec_gss_init_net(struct net *net) |
2155 | { | |
2156 | return gss_svc_init_net(net); | |
2157 | } | |
2158 | ||
2159 | static __net_exit void rpcsec_gss_exit_net(struct net *net) | |
2160 | { | |
2161 | gss_svc_shutdown_net(net); | |
2162 | } | |
2163 | ||
2164 | static struct pernet_operations rpcsec_gss_net_ops = { | |
2165 | .init = rpcsec_gss_init_net, | |
2166 | .exit = rpcsec_gss_exit_net, | |
2167 | }; | |
2168 | ||
1da177e4 LT |
2169 | /* |
2170 | * Initialize RPCSEC_GSS module | |
2171 | */ | |
2172 | static int __init init_rpcsec_gss(void) | |
2173 | { | |
2174 | int err = 0; | |
2175 | ||
2176 | err = rpcauth_register(&authgss_ops); | |
2177 | if (err) | |
2178 | goto out; | |
2179 | err = gss_svc_init(); | |
2180 | if (err) | |
2181 | goto out_unregister; | |
a1db410d SK |
2182 | err = register_pernet_subsys(&rpcsec_gss_net_ops); |
2183 | if (err) | |
2184 | goto out_svc_exit; | |
79a3f20b | 2185 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
1da177e4 | 2186 | return 0; |
a1db410d SK |
2187 | out_svc_exit: |
2188 | gss_svc_shutdown(); | |
1da177e4 LT |
2189 | out_unregister: |
2190 | rpcauth_unregister(&authgss_ops); | |
2191 | out: | |
2192 | return err; | |
2193 | } | |
2194 | ||
2195 | static void __exit exit_rpcsec_gss(void) | |
2196 | { | |
a1db410d | 2197 | unregister_pernet_subsys(&rpcsec_gss_net_ops); |
1da177e4 LT |
2198 | gss_svc_shutdown(); |
2199 | rpcauth_unregister(&authgss_ops); | |
bf12691d | 2200 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
1da177e4 LT |
2201 | } |
2202 | ||
71afa85e | 2203 | MODULE_ALIAS("rpc-auth-6"); |
1da177e4 | 2204 | MODULE_LICENSE("GPL"); |
126e216a TM |
2205 | module_param_named(expired_cred_retry_delay, |
2206 | gss_expired_cred_retry_delay, | |
2207 | uint, 0644); | |
2208 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " | |
2209 | "the RPC engine retries an expired credential"); | |
2210 | ||
4de6caa2 AA |
2211 | module_param_named(key_expire_timeo, |
2212 | gss_key_expire_timeo, | |
2213 | uint, 0644); | |
2214 | MODULE_PARM_DESC(key_expire_timeo, "Time (in seconds) at the end of a " | |
2215 | "credential keys lifetime where the NFS layer cleans up " | |
2216 | "prior to key expiration"); | |
2217 | ||
1da177e4 LT |
2218 | module_init(init_rpcsec_gss) |
2219 | module_exit(exit_rpcsec_gss) |