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ef416fc2 | 1 | /* |
bc44d920 | 2 | * "$Id: cert.c 6649 2007-07-11 21:46:42Z mike $" |
ef416fc2 | 3 | * |
4 | * Authentication certificate routines for the Common UNIX | |
5 | * Printing System (CUPS). | |
6 | * | |
bc44d920 | 7 | * Copyright 2007 by Apple Inc. |
bd7854cb | 8 | * Copyright 1997-2006 by Easy Software Products. |
ef416fc2 | 9 | * |
10 | * These coded instructions, statements, and computer programs are the | |
bc44d920 | 11 | * property of Apple Inc. and are protected by Federal copyright |
12 | * law. Distribution and use rights are outlined in the file "LICENSE.txt" | |
13 | * which should have been included with this file. If this file is | |
14 | * file is missing or damaged, see the license at "http://www.cups.org/". | |
ef416fc2 | 15 | * |
16 | * Contents: | |
17 | * | |
18 | * cupsdAddCert() - Add a certificate. | |
19 | * cupsdDeleteCert() - Delete a single certificate. | |
20 | * cupsdDeleteAllCerts() - Delete all certificates... | |
21 | * cupsdFindCert() - Find a certificate. | |
22 | * cupsdInitCerts() - Initialize the certificate "system" and root | |
23 | * certificate. | |
24 | */ | |
25 | ||
26 | /* | |
27 | * Include necessary headers... | |
28 | */ | |
29 | ||
30 | #include "cupsd.h" | |
fa73b229 | 31 | #ifdef HAVE_ACL_INIT |
32 | # include <sys/acl.h> | |
bd7854cb | 33 | # ifdef HAVE_MEMBERSHIP_H |
34 | # include <membership.h> | |
35 | # endif /* HAVE_MEMBERSHIP_H */ | |
fa73b229 | 36 | #endif /* HAVE_ACL_INIT */ |
ef416fc2 | 37 | |
38 | ||
39 | /* | |
40 | * 'cupsdAddCert()' - Add a certificate. | |
41 | */ | |
42 | ||
43 | void | |
44 | cupsdAddCert(int pid, /* I - Process ID */ | |
45 | const char *username) /* I - Username */ | |
46 | { | |
47 | int i; /* Looping var */ | |
48 | cupsd_cert_t *cert; /* Current certificate */ | |
49 | int fd; /* Certificate file */ | |
50 | char filename[1024]; /* Certificate filename */ | |
51 | static const char hex[] = "0123456789ABCDEF"; | |
52 | /* Hex constants... */ | |
53 | ||
54 | ||
55 | cupsdLogMessage(CUPSD_LOG_DEBUG2, | |
56 | "cupsdAddCert: adding certificate for pid %d", pid); | |
57 | ||
58 | /* | |
59 | * Allocate memory for the certificate... | |
60 | */ | |
61 | ||
62 | if ((cert = calloc(sizeof(cupsd_cert_t), 1)) == NULL) | |
63 | return; | |
64 | ||
65 | /* | |
66 | * Fill in the certificate information... | |
67 | */ | |
68 | ||
69 | cert->pid = pid; | |
70 | strlcpy(cert->username, username, sizeof(cert->username)); | |
71 | ||
72 | for (i = 0; i < 32; i ++) | |
73 | cert->certificate[i] = hex[random() & 15]; | |
74 | ||
75 | /* | |
76 | * Save the certificate to a file readable only by the User and Group | |
77 | * (or root and SystemGroup for PID == 0)... | |
78 | */ | |
79 | ||
80 | snprintf(filename, sizeof(filename), "%s/certs/%d", StateDir, pid); | |
81 | unlink(filename); | |
82 | ||
83 | if ((fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400)) < 0) | |
84 | { | |
85 | cupsdLogMessage(CUPSD_LOG_ERROR, | |
86 | "cupsdAddCert: Unable to create certificate file %s - %s", | |
87 | filename, strerror(errno)); | |
88 | free(cert); | |
89 | return; | |
90 | } | |
91 | ||
92 | if (pid == 0) | |
93 | { | |
fa73b229 | 94 | #ifdef HAVE_ACL_INIT |
95 | acl_t acl; /* ACL information */ | |
96 | acl_entry_t entry; /* ACL entry */ | |
97 | acl_permset_t permset; /* Permissions */ | |
bd7854cb | 98 | # ifdef HAVE_MBR_UID_TO_UUID |
fa73b229 | 99 | uuid_t group; /* Group ID */ |
bd7854cb | 100 | # endif /* HAVE_MBR_UID_TO_UUID */ |
e53920b9 | 101 | static int acls_not_supported = 0; |
102 | /* Only warn once */ | |
fa73b229 | 103 | #endif /* HAVE_ACL_INIT */ |
104 | ||
105 | ||
ef416fc2 | 106 | /* |
107 | * Root certificate... | |
108 | */ | |
109 | ||
110 | fchmod(fd, 0440); | |
111 | fchown(fd, RunUser, SystemGroupIDs[0]); | |
112 | ||
bd7854cb | 113 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAddCert: NumSystemGroups=%d", |
114 | NumSystemGroups); | |
115 | ||
fa73b229 | 116 | #ifdef HAVE_ACL_INIT |
117 | if (NumSystemGroups > 1) | |
118 | { | |
119 | /* | |
120 | * Set POSIX ACLs for the root certificate so that all system | |
121 | * groups can access it... | |
122 | */ | |
123 | ||
bd7854cb | 124 | # ifdef HAVE_MBR_UID_TO_UUID |
125 | /* | |
126 | * On MacOS X, ACLs use UUIDs instead of GIDs... | |
127 | */ | |
128 | ||
fa73b229 | 129 | acl = acl_init(NumSystemGroups - 1); |
130 | ||
131 | for (i = 1; i < NumSystemGroups; i ++) | |
132 | { | |
133 | /* | |
134 | * Add each group ID to the ACL... | |
135 | */ | |
136 | ||
137 | acl_create_entry(&acl, &entry); | |
138 | acl_get_permset(entry, &permset); | |
139 | acl_add_perm(permset, ACL_READ_DATA); | |
140 | acl_set_tag_type(entry, ACL_EXTENDED_ALLOW); | |
141 | mbr_gid_to_uuid((gid_t)SystemGroupIDs[i], group); | |
142 | acl_set_qualifier(entry, &group); | |
143 | acl_set_permset(entry, permset); | |
144 | } | |
bd7854cb | 145 | # else |
146 | /* | |
147 | * POSIX ACLs need permissions for owner, group, other, and mask | |
148 | * in addition to the rest of the system groups... | |
149 | */ | |
150 | ||
151 | acl = acl_init(NumSystemGroups + 3); | |
152 | ||
153 | /* Owner */ | |
154 | acl_create_entry(&acl, &entry); | |
155 | acl_get_permset(entry, &permset); | |
156 | acl_add_perm(permset, ACL_READ); | |
157 | acl_set_tag_type(entry, ACL_USER_OBJ); | |
158 | acl_set_permset(entry, permset); | |
159 | ||
160 | /* Group */ | |
161 | acl_create_entry(&acl, &entry); | |
162 | acl_get_permset(entry, &permset); | |
163 | acl_add_perm(permset, ACL_READ); | |
164 | acl_set_tag_type(entry, ACL_GROUP_OBJ); | |
165 | acl_set_permset(entry, permset); | |
166 | ||
167 | /* Others */ | |
168 | acl_create_entry(&acl, &entry); | |
169 | acl_get_permset(entry, &permset); | |
4744bd90 | 170 | acl_add_perm(permset, 0); |
bd7854cb | 171 | acl_set_tag_type(entry, ACL_OTHER); |
172 | acl_set_permset(entry, permset); | |
173 | ||
174 | /* Mask */ | |
175 | acl_create_entry(&acl, &entry); | |
176 | acl_get_permset(entry, &permset); | |
177 | acl_add_perm(permset, ACL_READ); | |
178 | acl_set_tag_type(entry, ACL_MASK); | |
179 | acl_set_permset(entry, permset); | |
180 | ||
181 | for (i = 1; i < NumSystemGroups; i ++) | |
182 | { | |
183 | /* | |
184 | * Add each group ID to the ACL... | |
185 | */ | |
186 | ||
187 | acl_create_entry(&acl, &entry); | |
188 | acl_get_permset(entry, &permset); | |
189 | acl_add_perm(permset, ACL_READ); | |
190 | acl_set_tag_type(entry, ACL_GROUP); | |
191 | acl_set_qualifier(entry, SystemGroupIDs + i); | |
192 | acl_set_permset(entry, permset); | |
193 | } | |
194 | ||
195 | if (acl_valid(acl)) | |
196 | { | |
e53920b9 | 197 | char *text, *textptr; /* Temporary string */ |
198 | ||
bd7854cb | 199 | |
200 | cupsdLogMessage(CUPSD_LOG_ERROR, "ACL did not validate: %s", | |
201 | strerror(errno)); | |
202 | text = acl_to_text(acl, NULL); | |
203 | for (textptr = strchr(text, '\n'); | |
204 | textptr; | |
205 | textptr = strchr(textptr + 1, '\n')) | |
206 | *textptr = ','; | |
207 | ||
208 | cupsdLogMessage(CUPSD_LOG_ERROR, "ACL: %s", text); | |
209 | free(text); | |
210 | } | |
211 | # endif /* HAVE_MBR_UID_TO_UUID */ | |
fa73b229 | 212 | |
213 | if (acl_set_fd(fd, acl)) | |
e53920b9 | 214 | { |
215 | if (errno != EOPNOTSUPP || !acls_not_supported) | |
216 | cupsdLogMessage(CUPSD_LOG_ERROR, | |
217 | "Unable to set ACLs on root certificate \"%s\" - %s", | |
218 | filename, strerror(errno)); | |
219 | ||
220 | if (errno == EOPNOTSUPP) | |
221 | acls_not_supported = 1; | |
222 | } | |
223 | ||
fa73b229 | 224 | acl_free(acl); |
225 | } | |
226 | #endif /* HAVE_ACL_INIT */ | |
227 | ||
ef416fc2 | 228 | RootCertTime = time(NULL); |
229 | } | |
230 | else | |
231 | { | |
232 | /* | |
233 | * CGI certificate... | |
234 | */ | |
235 | ||
236 | fchmod(fd, 0400); | |
237 | fchown(fd, User, Group); | |
238 | } | |
239 | ||
240 | DEBUG_printf(("ADD pid=%d, username=%s, cert=%s\n", pid, username, | |
241 | cert->certificate)); | |
242 | ||
243 | write(fd, cert->certificate, strlen(cert->certificate)); | |
244 | close(fd); | |
245 | ||
246 | /* | |
247 | * Insert the certificate at the front of the list... | |
248 | */ | |
249 | ||
250 | cert->next = Certs; | |
251 | Certs = cert; | |
252 | } | |
253 | ||
254 | ||
255 | /* | |
256 | * 'cupsdDeleteCert()' - Delete a single certificate. | |
257 | */ | |
258 | ||
259 | void | |
260 | cupsdDeleteCert(int pid) /* I - Process ID */ | |
261 | { | |
262 | cupsd_cert_t *cert, /* Current certificate */ | |
263 | *prev; /* Previous certificate */ | |
264 | char filename[1024]; /* Certificate file */ | |
265 | ||
266 | ||
267 | for (prev = NULL, cert = Certs; cert != NULL; prev = cert, cert = cert->next) | |
268 | if (cert->pid == pid) | |
269 | { | |
270 | /* | |
271 | * Remove this certificate from the list... | |
272 | */ | |
273 | ||
274 | cupsdLogMessage(CUPSD_LOG_DEBUG2, | |
275 | "cupsdDeleteCert: removing certificate for pid %d", pid); | |
276 | ||
277 | DEBUG_printf(("DELETE pid=%d, username=%s, cert=%s\n", cert->pid, | |
278 | cert->username, cert->certificate)); | |
279 | ||
280 | if (prev == NULL) | |
281 | Certs = cert->next; | |
282 | else | |
283 | prev->next = cert->next; | |
284 | ||
285 | free(cert); | |
286 | ||
287 | /* | |
288 | * Delete the file and return... | |
289 | */ | |
290 | ||
291 | snprintf(filename, sizeof(filename), "%s/certs/%d", StateDir, pid); | |
292 | if (unlink(filename)) | |
293 | cupsdLogMessage(CUPSD_LOG_ERROR, | |
294 | "cupsdDeleteCert: Unable to remove %s!\n", filename); | |
295 | ||
296 | return; | |
297 | } | |
298 | } | |
299 | ||
300 | ||
301 | /* | |
302 | * 'cupsdDeleteAllCerts()' - Delete all certificates... | |
303 | */ | |
304 | ||
305 | void | |
306 | cupsdDeleteAllCerts(void) | |
307 | { | |
308 | cupsd_cert_t *cert, /* Current certificate */ | |
309 | *next; /* Next certificate */ | |
310 | char filename[1024]; /* Certificate file */ | |
311 | ||
312 | ||
313 | /* | |
314 | * Loop through each certificate, deleting them... | |
315 | */ | |
316 | ||
317 | for (cert = Certs; cert != NULL; cert = next) | |
318 | { | |
319 | /* | |
320 | * Delete the file... | |
321 | */ | |
322 | ||
323 | snprintf(filename, sizeof(filename), "%s/certs/%d", StateDir, cert->pid); | |
324 | if (unlink(filename)) | |
325 | cupsdLogMessage(CUPSD_LOG_ERROR, | |
326 | "cupsdDeleteAllCerts: Unable to remove %s!\n", filename); | |
327 | ||
328 | /* | |
329 | * Free memory... | |
330 | */ | |
331 | ||
332 | next = cert->next; | |
333 | free(cert); | |
334 | } | |
335 | ||
e1d6a774 | 336 | Certs = NULL; |
337 | RootCertTime = 0; | |
ef416fc2 | 338 | } |
339 | ||
340 | ||
341 | /* | |
342 | * 'cupsdFindCert()' - Find a certificate. | |
343 | */ | |
344 | ||
345 | const char * /* O - Matching username or NULL */ | |
346 | cupsdFindCert(const char *certificate) /* I - Certificate */ | |
347 | { | |
348 | cupsd_cert_t *cert; /* Current certificate */ | |
349 | ||
350 | ||
351 | DEBUG_printf(("cupsdFindCert(certificate=%s)\n", certificate)); | |
352 | for (cert = Certs; cert != NULL; cert = cert->next) | |
353 | if (!strcasecmp(certificate, cert->certificate)) | |
354 | { | |
355 | DEBUG_printf((" returning %s...\n", cert->username)); | |
356 | return (cert->username); | |
357 | } | |
358 | ||
359 | DEBUG_puts(" certificate not found!"); | |
360 | ||
361 | return (NULL); | |
362 | } | |
363 | ||
364 | ||
365 | /* | |
366 | * 'cupsdInitCerts()' - Initialize the certificate "system" and root | |
367 | * certificate. | |
368 | */ | |
369 | ||
370 | void | |
371 | cupsdInitCerts(void) | |
372 | { | |
373 | cups_file_t *fp; /* /dev/random file */ | |
374 | unsigned seed; /* Seed for random number generator */ | |
375 | struct timeval tod; /* Time of day */ | |
376 | ||
377 | ||
378 | /* | |
379 | * Initialize the random number generator using the random device or | |
380 | * the current time, as available... | |
381 | */ | |
382 | ||
383 | if ((fp = cupsFileOpen("/dev/urandom", "rb")) == NULL) | |
384 | { | |
385 | /* | |
386 | * Get the time in usecs and use it as the initial seed... | |
387 | */ | |
388 | ||
389 | gettimeofday(&tod, NULL); | |
390 | ||
391 | seed = (unsigned)(tod.tv_sec + tod.tv_usec); | |
392 | } | |
393 | else | |
394 | { | |
395 | /* | |
396 | * Read 4 random characters from the random device and use | |
397 | * them as the seed... | |
398 | */ | |
399 | ||
400 | seed = cupsFileGetChar(fp); | |
401 | seed = (seed << 8) | cupsFileGetChar(fp); | |
402 | seed = (seed << 8) | cupsFileGetChar(fp); | |
403 | seed = (seed << 8) | cupsFileGetChar(fp); | |
404 | ||
405 | cupsFileClose(fp); | |
406 | } | |
407 | ||
408 | srandom(seed); | |
409 | ||
410 | /* | |
411 | * Create a root certificate and return... | |
412 | */ | |
413 | ||
414 | if (!RunUser) | |
415 | cupsdAddCert(0, "root"); | |
416 | } | |
417 | ||
418 | ||
419 | /* | |
bc44d920 | 420 | * End of "$Id: cert.c 6649 2007-07-11 21:46:42Z mike $". |
ef416fc2 | 421 | */ |