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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5d55a345 | 5 | * James Morris <jmorris@redhat.com> |
1da177e4 LT |
6 | * |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
5d55a345 | 14 | * Added conditional policy language extensions |
1da177e4 | 15 | * |
7420ed23 VY |
16 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
17 | * | |
18 | * Added support for NetLabel | |
3bb56b25 | 19 | * Added support for the policy capability bitmap |
7420ed23 | 20 | * |
b94c7e67 CS |
21 | * Updated: Chad Sellers <csellers@tresys.com> |
22 | * | |
23 | * Added validation of kernel classes and permissions | |
24 | * | |
44c2d9bd KK |
25 | * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com> |
26 | * | |
27 | * Added support for bounds domain and audit messaged on masked permissions | |
28 | * | |
29 | * Copyright (C) 2008, 2009 NEC Corporation | |
3bb56b25 | 30 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
376bd9cb | 31 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 32 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
33 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
34 | * This program is free software; you can redistribute it and/or modify | |
5d55a345 | 35 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
36 | * the Free Software Foundation, version 2. |
37 | */ | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/spinlock.h> | |
9f2ad665 | 42 | #include <linux/rcupdate.h> |
1da177e4 LT |
43 | #include <linux/errno.h> |
44 | #include <linux/in.h> | |
45 | #include <linux/sched.h> | |
46 | #include <linux/audit.h> | |
bb003079 | 47 | #include <linux/mutex.h> |
0e55a004 | 48 | #include <linux/selinux.h> |
7420ed23 | 49 | #include <net/netlabel.h> |
bb003079 | 50 | |
1da177e4 LT |
51 | #include "flask.h" |
52 | #include "avc.h" | |
53 | #include "avc_ss.h" | |
54 | #include "security.h" | |
55 | #include "context.h" | |
56 | #include "policydb.h" | |
57 | #include "sidtab.h" | |
58 | #include "services.h" | |
59 | #include "conditional.h" | |
60 | #include "mls.h" | |
7420ed23 | 61 | #include "objsec.h" |
c60475bf | 62 | #include "netlabel.h" |
3de4bab5 | 63 | #include "xfrm.h" |
02752760 | 64 | #include "ebitmap.h" |
9d57a7f9 | 65 | #include "audit.h" |
1da177e4 LT |
66 | |
67 | extern void selnl_notify_policyload(u32 seqno); | |
1da177e4 | 68 | |
3bb56b25 | 69 | int selinux_policycap_netpeer; |
b0c636b9 | 70 | int selinux_policycap_openperm; |
3bb56b25 | 71 | |
1da177e4 | 72 | static DEFINE_RWLOCK(policy_rwlock); |
1da177e4 LT |
73 | |
74 | static struct sidtab sidtab; | |
75 | struct policydb policydb; | |
5d55a345 | 76 | int ss_initialized; |
1da177e4 LT |
77 | |
78 | /* | |
79 | * The largest sequence number that has been used when | |
80 | * providing an access decision to the access vector cache. | |
81 | * The sequence number only changes when a policy change | |
82 | * occurs. | |
83 | */ | |
5d55a345 | 84 | static u32 latest_granting; |
1da177e4 LT |
85 | |
86 | /* Forward declaration. */ | |
87 | static int context_struct_to_string(struct context *context, char **scontext, | |
88 | u32 *scontext_len); | |
89 | ||
19439d05 SS |
90 | static void context_struct_compute_av(struct context *scontext, |
91 | struct context *tcontext, | |
92 | u16 tclass, | |
93 | struct av_decision *avd); | |
c6d3aaa4 SS |
94 | |
95 | struct selinux_mapping { | |
96 | u16 value; /* policy value */ | |
97 | unsigned num_perms; | |
98 | u32 perms[sizeof(u32) * 8]; | |
99 | }; | |
100 | ||
101 | static struct selinux_mapping *current_mapping; | |
102 | static u16 current_mapping_size; | |
103 | ||
104 | static int selinux_set_mapping(struct policydb *pol, | |
105 | struct security_class_mapping *map, | |
106 | struct selinux_mapping **out_map_p, | |
107 | u16 *out_map_size) | |
108 | { | |
109 | struct selinux_mapping *out_map = NULL; | |
110 | size_t size = sizeof(struct selinux_mapping); | |
111 | u16 i, j; | |
112 | unsigned k; | |
113 | bool print_unknown_handle = false; | |
114 | ||
115 | /* Find number of classes in the input mapping */ | |
116 | if (!map) | |
117 | return -EINVAL; | |
118 | i = 0; | |
119 | while (map[i].name) | |
120 | i++; | |
121 | ||
122 | /* Allocate space for the class records, plus one for class zero */ | |
123 | out_map = kcalloc(++i, size, GFP_ATOMIC); | |
124 | if (!out_map) | |
125 | return -ENOMEM; | |
126 | ||
127 | /* Store the raw class and permission values */ | |
128 | j = 0; | |
129 | while (map[j].name) { | |
130 | struct security_class_mapping *p_in = map + (j++); | |
131 | struct selinux_mapping *p_out = out_map + j; | |
132 | ||
133 | /* An empty class string skips ahead */ | |
134 | if (!strcmp(p_in->name, "")) { | |
135 | p_out->num_perms = 0; | |
136 | continue; | |
137 | } | |
138 | ||
139 | p_out->value = string_to_security_class(pol, p_in->name); | |
140 | if (!p_out->value) { | |
141 | printk(KERN_INFO | |
142 | "SELinux: Class %s not defined in policy.\n", | |
143 | p_in->name); | |
144 | if (pol->reject_unknown) | |
145 | goto err; | |
146 | p_out->num_perms = 0; | |
147 | print_unknown_handle = true; | |
148 | continue; | |
149 | } | |
150 | ||
151 | k = 0; | |
152 | while (p_in->perms && p_in->perms[k]) { | |
153 | /* An empty permission string skips ahead */ | |
154 | if (!*p_in->perms[k]) { | |
155 | k++; | |
156 | continue; | |
157 | } | |
158 | p_out->perms[k] = string_to_av_perm(pol, p_out->value, | |
159 | p_in->perms[k]); | |
160 | if (!p_out->perms[k]) { | |
161 | printk(KERN_INFO | |
162 | "SELinux: Permission %s in class %s not defined in policy.\n", | |
163 | p_in->perms[k], p_in->name); | |
164 | if (pol->reject_unknown) | |
165 | goto err; | |
166 | print_unknown_handle = true; | |
167 | } | |
168 | ||
169 | k++; | |
170 | } | |
171 | p_out->num_perms = k; | |
172 | } | |
173 | ||
174 | if (print_unknown_handle) | |
175 | printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n", | |
176 | pol->allow_unknown ? "allowed" : "denied"); | |
177 | ||
178 | *out_map_p = out_map; | |
179 | *out_map_size = i; | |
180 | return 0; | |
181 | err: | |
182 | kfree(out_map); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Get real, policy values from mapped values | |
188 | */ | |
189 | ||
190 | static u16 unmap_class(u16 tclass) | |
191 | { | |
192 | if (tclass < current_mapping_size) | |
193 | return current_mapping[tclass].value; | |
194 | ||
195 | return tclass; | |
196 | } | |
197 | ||
c6d3aaa4 SS |
198 | static void map_decision(u16 tclass, struct av_decision *avd, |
199 | int allow_unknown) | |
200 | { | |
201 | if (tclass < current_mapping_size) { | |
202 | unsigned i, n = current_mapping[tclass].num_perms; | |
203 | u32 result; | |
204 | ||
205 | for (i = 0, result = 0; i < n; i++) { | |
206 | if (avd->allowed & current_mapping[tclass].perms[i]) | |
207 | result |= 1<<i; | |
208 | if (allow_unknown && !current_mapping[tclass].perms[i]) | |
209 | result |= 1<<i; | |
210 | } | |
211 | avd->allowed = result; | |
212 | ||
213 | for (i = 0, result = 0; i < n; i++) | |
214 | if (avd->auditallow & current_mapping[tclass].perms[i]) | |
215 | result |= 1<<i; | |
216 | avd->auditallow = result; | |
217 | ||
218 | for (i = 0, result = 0; i < n; i++) { | |
219 | if (avd->auditdeny & current_mapping[tclass].perms[i]) | |
220 | result |= 1<<i; | |
221 | if (!allow_unknown && !current_mapping[tclass].perms[i]) | |
222 | result |= 1<<i; | |
223 | } | |
0bce9527 EP |
224 | /* |
225 | * In case the kernel has a bug and requests a permission | |
226 | * between num_perms and the maximum permission number, we | |
227 | * should audit that denial | |
228 | */ | |
229 | for (; i < (sizeof(u32)*8); i++) | |
230 | result |= 1<<i; | |
c6d3aaa4 SS |
231 | avd->auditdeny = result; |
232 | } | |
233 | } | |
234 | ||
235 | ||
1da177e4 LT |
236 | /* |
237 | * Return the boolean value of a constraint expression | |
238 | * when it is applied to the specified source and target | |
239 | * security contexts. | |
240 | * | |
241 | * xcontext is a special beast... It is used by the validatetrans rules | |
242 | * only. For these rules, scontext is the context before the transition, | |
243 | * tcontext is the context after the transition, and xcontext is the context | |
244 | * of the process performing the transition. All other callers of | |
245 | * constraint_expr_eval should pass in NULL for xcontext. | |
246 | */ | |
247 | static int constraint_expr_eval(struct context *scontext, | |
248 | struct context *tcontext, | |
249 | struct context *xcontext, | |
250 | struct constraint_expr *cexpr) | |
251 | { | |
252 | u32 val1, val2; | |
253 | struct context *c; | |
254 | struct role_datum *r1, *r2; | |
255 | struct mls_level *l1, *l2; | |
256 | struct constraint_expr *e; | |
257 | int s[CEXPR_MAXDEPTH]; | |
258 | int sp = -1; | |
259 | ||
260 | for (e = cexpr; e; e = e->next) { | |
261 | switch (e->expr_type) { | |
262 | case CEXPR_NOT: | |
263 | BUG_ON(sp < 0); | |
264 | s[sp] = !s[sp]; | |
265 | break; | |
266 | case CEXPR_AND: | |
267 | BUG_ON(sp < 1); | |
268 | sp--; | |
269 | s[sp] &= s[sp+1]; | |
270 | break; | |
271 | case CEXPR_OR: | |
272 | BUG_ON(sp < 1); | |
273 | sp--; | |
274 | s[sp] |= s[sp+1]; | |
275 | break; | |
276 | case CEXPR_ATTR: | |
277 | if (sp == (CEXPR_MAXDEPTH-1)) | |
278 | return 0; | |
279 | switch (e->attr) { | |
280 | case CEXPR_USER: | |
281 | val1 = scontext->user; | |
282 | val2 = tcontext->user; | |
283 | break; | |
284 | case CEXPR_TYPE: | |
285 | val1 = scontext->type; | |
286 | val2 = tcontext->type; | |
287 | break; | |
288 | case CEXPR_ROLE: | |
289 | val1 = scontext->role; | |
290 | val2 = tcontext->role; | |
291 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
292 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
293 | switch (e->op) { | |
294 | case CEXPR_DOM: | |
295 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
296 | val2 - 1); | |
297 | continue; | |
298 | case CEXPR_DOMBY: | |
299 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
300 | val1 - 1); | |
301 | continue; | |
302 | case CEXPR_INCOMP: | |
5d55a345 EP |
303 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
304 | val2 - 1) && | |
305 | !ebitmap_get_bit(&r2->dominates, | |
306 | val1 - 1)); | |
1da177e4 LT |
307 | continue; |
308 | default: | |
309 | break; | |
310 | } | |
311 | break; | |
312 | case CEXPR_L1L2: | |
313 | l1 = &(scontext->range.level[0]); | |
314 | l2 = &(tcontext->range.level[0]); | |
315 | goto mls_ops; | |
316 | case CEXPR_L1H2: | |
317 | l1 = &(scontext->range.level[0]); | |
318 | l2 = &(tcontext->range.level[1]); | |
319 | goto mls_ops; | |
320 | case CEXPR_H1L2: | |
321 | l1 = &(scontext->range.level[1]); | |
322 | l2 = &(tcontext->range.level[0]); | |
323 | goto mls_ops; | |
324 | case CEXPR_H1H2: | |
325 | l1 = &(scontext->range.level[1]); | |
326 | l2 = &(tcontext->range.level[1]); | |
327 | goto mls_ops; | |
328 | case CEXPR_L1H1: | |
329 | l1 = &(scontext->range.level[0]); | |
330 | l2 = &(scontext->range.level[1]); | |
331 | goto mls_ops; | |
332 | case CEXPR_L2H2: | |
333 | l1 = &(tcontext->range.level[0]); | |
334 | l2 = &(tcontext->range.level[1]); | |
335 | goto mls_ops; | |
336 | mls_ops: | |
337 | switch (e->op) { | |
338 | case CEXPR_EQ: | |
339 | s[++sp] = mls_level_eq(l1, l2); | |
340 | continue; | |
341 | case CEXPR_NEQ: | |
342 | s[++sp] = !mls_level_eq(l1, l2); | |
343 | continue; | |
344 | case CEXPR_DOM: | |
345 | s[++sp] = mls_level_dom(l1, l2); | |
346 | continue; | |
347 | case CEXPR_DOMBY: | |
348 | s[++sp] = mls_level_dom(l2, l1); | |
349 | continue; | |
350 | case CEXPR_INCOMP: | |
351 | s[++sp] = mls_level_incomp(l2, l1); | |
352 | continue; | |
353 | default: | |
354 | BUG(); | |
355 | return 0; | |
356 | } | |
357 | break; | |
358 | default: | |
359 | BUG(); | |
360 | return 0; | |
361 | } | |
362 | ||
363 | switch (e->op) { | |
364 | case CEXPR_EQ: | |
365 | s[++sp] = (val1 == val2); | |
366 | break; | |
367 | case CEXPR_NEQ: | |
368 | s[++sp] = (val1 != val2); | |
369 | break; | |
370 | default: | |
371 | BUG(); | |
372 | return 0; | |
373 | } | |
374 | break; | |
375 | case CEXPR_NAMES: | |
376 | if (sp == (CEXPR_MAXDEPTH-1)) | |
377 | return 0; | |
378 | c = scontext; | |
379 | if (e->attr & CEXPR_TARGET) | |
380 | c = tcontext; | |
381 | else if (e->attr & CEXPR_XTARGET) { | |
382 | c = xcontext; | |
383 | if (!c) { | |
384 | BUG(); | |
385 | return 0; | |
386 | } | |
387 | } | |
388 | if (e->attr & CEXPR_USER) | |
389 | val1 = c->user; | |
390 | else if (e->attr & CEXPR_ROLE) | |
391 | val1 = c->role; | |
392 | else if (e->attr & CEXPR_TYPE) | |
393 | val1 = c->type; | |
394 | else { | |
395 | BUG(); | |
396 | return 0; | |
397 | } | |
398 | ||
399 | switch (e->op) { | |
400 | case CEXPR_EQ: | |
401 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
402 | break; | |
403 | case CEXPR_NEQ: | |
404 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
405 | break; | |
406 | default: | |
407 | BUG(); | |
408 | return 0; | |
409 | } | |
410 | break; | |
411 | default: | |
412 | BUG(); | |
413 | return 0; | |
414 | } | |
415 | } | |
416 | ||
417 | BUG_ON(sp != 0); | |
418 | return s[0]; | |
419 | } | |
420 | ||
44c2d9bd KK |
421 | /* |
422 | * security_dump_masked_av - dumps masked permissions during | |
423 | * security_compute_av due to RBAC, MLS/Constraint and Type bounds. | |
424 | */ | |
425 | static int dump_masked_av_helper(void *k, void *d, void *args) | |
426 | { | |
427 | struct perm_datum *pdatum = d; | |
428 | char **permission_names = args; | |
429 | ||
430 | BUG_ON(pdatum->value < 1 || pdatum->value > 32); | |
431 | ||
432 | permission_names[pdatum->value - 1] = (char *)k; | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | static void security_dump_masked_av(struct context *scontext, | |
438 | struct context *tcontext, | |
439 | u16 tclass, | |
440 | u32 permissions, | |
441 | const char *reason) | |
442 | { | |
443 | struct common_datum *common_dat; | |
444 | struct class_datum *tclass_dat; | |
445 | struct audit_buffer *ab; | |
446 | char *tclass_name; | |
447 | char *scontext_name = NULL; | |
448 | char *tcontext_name = NULL; | |
449 | char *permission_names[32]; | |
450 | int index, length; | |
451 | bool need_comma = false; | |
452 | ||
453 | if (!permissions) | |
454 | return; | |
455 | ||
456 | tclass_name = policydb.p_class_val_to_name[tclass - 1]; | |
457 | tclass_dat = policydb.class_val_to_struct[tclass - 1]; | |
458 | common_dat = tclass_dat->comdatum; | |
459 | ||
460 | /* init permission_names */ | |
461 | if (common_dat && | |
462 | hashtab_map(common_dat->permissions.table, | |
463 | dump_masked_av_helper, permission_names) < 0) | |
464 | goto out; | |
465 | ||
466 | if (hashtab_map(tclass_dat->permissions.table, | |
467 | dump_masked_av_helper, permission_names) < 0) | |
468 | goto out; | |
469 | ||
470 | /* get scontext/tcontext in text form */ | |
471 | if (context_struct_to_string(scontext, | |
472 | &scontext_name, &length) < 0) | |
473 | goto out; | |
474 | ||
475 | if (context_struct_to_string(tcontext, | |
476 | &tcontext_name, &length) < 0) | |
477 | goto out; | |
478 | ||
479 | /* audit a message */ | |
480 | ab = audit_log_start(current->audit_context, | |
481 | GFP_ATOMIC, AUDIT_SELINUX_ERR); | |
482 | if (!ab) | |
483 | goto out; | |
484 | ||
485 | audit_log_format(ab, "op=security_compute_av reason=%s " | |
486 | "scontext=%s tcontext=%s tclass=%s perms=", | |
487 | reason, scontext_name, tcontext_name, tclass_name); | |
488 | ||
489 | for (index = 0; index < 32; index++) { | |
490 | u32 mask = (1 << index); | |
491 | ||
492 | if ((mask & permissions) == 0) | |
493 | continue; | |
494 | ||
495 | audit_log_format(ab, "%s%s", | |
496 | need_comma ? "," : "", | |
497 | permission_names[index] | |
498 | ? permission_names[index] : "????"); | |
499 | need_comma = true; | |
500 | } | |
501 | audit_log_end(ab); | |
502 | out: | |
503 | /* release scontext/tcontext */ | |
504 | kfree(tcontext_name); | |
505 | kfree(scontext_name); | |
506 | ||
507 | return; | |
508 | } | |
509 | ||
d9250dea KK |
510 | /* |
511 | * security_boundary_permission - drops violated permissions | |
512 | * on boundary constraint. | |
513 | */ | |
514 | static void type_attribute_bounds_av(struct context *scontext, | |
515 | struct context *tcontext, | |
516 | u16 tclass, | |
d9250dea KK |
517 | struct av_decision *avd) |
518 | { | |
d9250dea KK |
519 | struct type_datum *source |
520 | = policydb.type_val_to_struct[scontext->type - 1]; | |
d9250dea KK |
521 | |
522 | if (source->bounds) { | |
7d52a155 KK |
523 | struct context lo_scontext; |
524 | struct av_decision lo_avd; | |
525 | u32 masked; | |
526 | ||
d9250dea KK |
527 | memset(&lo_avd, 0, sizeof(lo_avd)); |
528 | ||
529 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); | |
530 | lo_scontext.type = source->bounds; | |
531 | ||
532 | context_struct_compute_av(&lo_scontext, | |
533 | tcontext, | |
534 | tclass, | |
d9250dea KK |
535 | &lo_avd); |
536 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
537 | return; /* no masked permission */ | |
538 | masked = ~lo_avd.allowed & avd->allowed; | |
d9250dea | 539 | |
d9250dea KK |
540 | /* mask violated permissions */ |
541 | avd->allowed &= ~masked; | |
542 | ||
44c2d9bd KK |
543 | /* audit masked permissions */ |
544 | security_dump_masked_av(scontext, tcontext, | |
545 | tclass, masked, "bounds"); | |
d9250dea KK |
546 | } |
547 | } | |
548 | ||
1da177e4 LT |
549 | /* |
550 | * Compute access vectors based on a context structure pair for | |
551 | * the permissions in a particular class. | |
552 | */ | |
19439d05 SS |
553 | static void context_struct_compute_av(struct context *scontext, |
554 | struct context *tcontext, | |
555 | u16 tclass, | |
556 | struct av_decision *avd) | |
1da177e4 LT |
557 | { |
558 | struct constraint_node *constraint; | |
559 | struct role_allow *ra; | |
560 | struct avtab_key avkey; | |
782ebb99 | 561 | struct avtab_node *node; |
1da177e4 | 562 | struct class_datum *tclass_datum; |
782ebb99 SS |
563 | struct ebitmap *sattr, *tattr; |
564 | struct ebitmap_node *snode, *tnode; | |
565 | unsigned int i, j; | |
1da177e4 | 566 | |
1da177e4 | 567 | avd->allowed = 0; |
1da177e4 LT |
568 | avd->auditallow = 0; |
569 | avd->auditdeny = 0xffffffff; | |
1da177e4 | 570 | |
c6d3aaa4 SS |
571 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { |
572 | if (printk_ratelimit()) | |
573 | printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass); | |
19439d05 | 574 | return; |
c6d3aaa4 | 575 | } |
3f12070e EP |
576 | |
577 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
578 | ||
1da177e4 LT |
579 | /* |
580 | * If a specific type enforcement rule was defined for | |
581 | * this permission check, then use it. | |
582 | */ | |
1da177e4 | 583 | avkey.target_class = tclass; |
782ebb99 SS |
584 | avkey.specified = AVTAB_AV; |
585 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
586 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
9fe79ad1 KK |
587 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
588 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
589 | avkey.source_type = i + 1; |
590 | avkey.target_type = j + 1; | |
591 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
dbc74c65 | 592 | node; |
782ebb99 SS |
593 | node = avtab_search_node_next(node, avkey.specified)) { |
594 | if (node->key.specified == AVTAB_ALLOWED) | |
595 | avd->allowed |= node->datum.data; | |
596 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
597 | avd->auditallow |= node->datum.data; | |
598 | else if (node->key.specified == AVTAB_AUDITDENY) | |
599 | avd->auditdeny &= node->datum.data; | |
600 | } | |
1da177e4 | 601 | |
782ebb99 SS |
602 | /* Check conditional av table for additional permissions */ |
603 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
604 | ||
605 | } | |
606 | } | |
1da177e4 LT |
607 | |
608 | /* | |
609 | * Remove any permissions prohibited by a constraint (this includes | |
610 | * the MLS policy). | |
611 | */ | |
612 | constraint = tclass_datum->constraints; | |
613 | while (constraint) { | |
614 | if ((constraint->permissions & (avd->allowed)) && | |
615 | !constraint_expr_eval(scontext, tcontext, NULL, | |
616 | constraint->expr)) { | |
caabbdc0 | 617 | avd->allowed &= ~(constraint->permissions); |
1da177e4 LT |
618 | } |
619 | constraint = constraint->next; | |
620 | } | |
621 | ||
622 | /* | |
623 | * If checking process transition permission and the | |
624 | * role is changing, then check the (current_role, new_role) | |
625 | * pair. | |
626 | */ | |
c6d3aaa4 SS |
627 | if (tclass == policydb.process_class && |
628 | (avd->allowed & policydb.process_trans_perms) && | |
1da177e4 LT |
629 | scontext->role != tcontext->role) { |
630 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
631 | if (scontext->role == ra->role && | |
632 | tcontext->role == ra->new_role) | |
633 | break; | |
634 | } | |
635 | if (!ra) | |
c6d3aaa4 | 636 | avd->allowed &= ~policydb.process_trans_perms; |
1da177e4 LT |
637 | } |
638 | ||
d9250dea KK |
639 | /* |
640 | * If the given source and target types have boundary | |
641 | * constraint, lazy checks have to mask any violated | |
642 | * permission and notice it to userspace via audit. | |
643 | */ | |
644 | type_attribute_bounds_av(scontext, tcontext, | |
19439d05 | 645 | tclass, avd); |
1da177e4 LT |
646 | } |
647 | ||
648 | static int security_validtrans_handle_fail(struct context *ocontext, | |
5d55a345 EP |
649 | struct context *ncontext, |
650 | struct context *tcontext, | |
651 | u16 tclass) | |
1da177e4 LT |
652 | { |
653 | char *o = NULL, *n = NULL, *t = NULL; | |
654 | u32 olen, nlen, tlen; | |
655 | ||
656 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
657 | goto out; | |
658 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
659 | goto out; | |
660 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
661 | goto out; | |
9ad9ad38 | 662 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
5d55a345 EP |
663 | "security_validate_transition: denied for" |
664 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
665 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
1da177e4 LT |
666 | out: |
667 | kfree(o); | |
668 | kfree(n); | |
669 | kfree(t); | |
670 | ||
671 | if (!selinux_enforcing) | |
672 | return 0; | |
673 | return -EPERM; | |
674 | } | |
675 | ||
676 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
c6d3aaa4 | 677 | u16 orig_tclass) |
1da177e4 LT |
678 | { |
679 | struct context *ocontext; | |
680 | struct context *ncontext; | |
681 | struct context *tcontext; | |
682 | struct class_datum *tclass_datum; | |
683 | struct constraint_node *constraint; | |
c6d3aaa4 | 684 | u16 tclass; |
1da177e4 LT |
685 | int rc = 0; |
686 | ||
687 | if (!ss_initialized) | |
688 | return 0; | |
689 | ||
0804d113 | 690 | read_lock(&policy_rwlock); |
1da177e4 | 691 | |
c6d3aaa4 SS |
692 | tclass = unmap_class(orig_tclass); |
693 | ||
1da177e4 | 694 | if (!tclass || tclass > policydb.p_classes.nprim) { |
744ba35e EP |
695 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", |
696 | __func__, tclass); | |
1da177e4 LT |
697 | rc = -EINVAL; |
698 | goto out; | |
699 | } | |
700 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
701 | ||
702 | ocontext = sidtab_search(&sidtab, oldsid); | |
703 | if (!ocontext) { | |
744ba35e EP |
704 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
705 | __func__, oldsid); | |
1da177e4 LT |
706 | rc = -EINVAL; |
707 | goto out; | |
708 | } | |
709 | ||
710 | ncontext = sidtab_search(&sidtab, newsid); | |
711 | if (!ncontext) { | |
744ba35e EP |
712 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
713 | __func__, newsid); | |
1da177e4 LT |
714 | rc = -EINVAL; |
715 | goto out; | |
716 | } | |
717 | ||
718 | tcontext = sidtab_search(&sidtab, tasksid); | |
719 | if (!tcontext) { | |
744ba35e EP |
720 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
721 | __func__, tasksid); | |
1da177e4 LT |
722 | rc = -EINVAL; |
723 | goto out; | |
724 | } | |
725 | ||
726 | constraint = tclass_datum->validatetrans; | |
727 | while (constraint) { | |
728 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 729 | constraint->expr)) { |
1da177e4 | 730 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
5d55a345 | 731 | tcontext, tclass); |
1da177e4 LT |
732 | goto out; |
733 | } | |
734 | constraint = constraint->next; | |
735 | } | |
736 | ||
737 | out: | |
0804d113 | 738 | read_unlock(&policy_rwlock); |
1da177e4 LT |
739 | return rc; |
740 | } | |
741 | ||
d9250dea KK |
742 | /* |
743 | * security_bounded_transition - check whether the given | |
744 | * transition is directed to bounded, or not. | |
745 | * It returns 0, if @newsid is bounded by @oldsid. | |
746 | * Otherwise, it returns error code. | |
747 | * | |
748 | * @oldsid : current security identifier | |
749 | * @newsid : destinated security identifier | |
750 | */ | |
751 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
752 | { | |
753 | struct context *old_context, *new_context; | |
754 | struct type_datum *type; | |
755 | int index; | |
756 | int rc = -EINVAL; | |
757 | ||
758 | read_lock(&policy_rwlock); | |
759 | ||
760 | old_context = sidtab_search(&sidtab, old_sid); | |
761 | if (!old_context) { | |
762 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
763 | __func__, old_sid); | |
764 | goto out; | |
765 | } | |
766 | ||
767 | new_context = sidtab_search(&sidtab, new_sid); | |
768 | if (!new_context) { | |
769 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
770 | __func__, new_sid); | |
771 | goto out; | |
772 | } | |
773 | ||
af901ca1 | 774 | /* type/domain unchanged */ |
d9250dea KK |
775 | if (old_context->type == new_context->type) { |
776 | rc = 0; | |
777 | goto out; | |
778 | } | |
779 | ||
780 | index = new_context->type; | |
781 | while (true) { | |
782 | type = policydb.type_val_to_struct[index - 1]; | |
783 | BUG_ON(!type); | |
784 | ||
785 | /* not bounded anymore */ | |
786 | if (!type->bounds) { | |
787 | rc = -EPERM; | |
788 | break; | |
789 | } | |
790 | ||
791 | /* @newsid is bounded by @oldsid */ | |
792 | if (type->bounds == old_context->type) { | |
793 | rc = 0; | |
794 | break; | |
795 | } | |
796 | index = type->bounds; | |
797 | } | |
44c2d9bd KK |
798 | |
799 | if (rc) { | |
800 | char *old_name = NULL; | |
801 | char *new_name = NULL; | |
802 | int length; | |
803 | ||
804 | if (!context_struct_to_string(old_context, | |
805 | &old_name, &length) && | |
806 | !context_struct_to_string(new_context, | |
807 | &new_name, &length)) { | |
808 | audit_log(current->audit_context, | |
809 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
810 | "op=security_bounded_transition " | |
811 | "result=denied " | |
812 | "oldcontext=%s newcontext=%s", | |
813 | old_name, new_name); | |
814 | } | |
815 | kfree(new_name); | |
816 | kfree(old_name); | |
817 | } | |
d9250dea KK |
818 | out: |
819 | read_unlock(&policy_rwlock); | |
820 | ||
821 | return rc; | |
822 | } | |
823 | ||
19439d05 | 824 | static void avd_init(struct av_decision *avd) |
c6d3aaa4 | 825 | { |
19439d05 SS |
826 | avd->allowed = 0; |
827 | avd->auditallow = 0; | |
828 | avd->auditdeny = 0xffffffff; | |
829 | avd->seqno = latest_granting; | |
830 | avd->flags = 0; | |
c6d3aaa4 SS |
831 | } |
832 | ||
19439d05 | 833 | |
1da177e4 LT |
834 | /** |
835 | * security_compute_av - Compute access vector decisions. | |
836 | * @ssid: source security identifier | |
837 | * @tsid: target security identifier | |
838 | * @tclass: target security class | |
1da177e4 LT |
839 | * @avd: access vector decisions |
840 | * | |
841 | * Compute a set of access vector decisions based on the | |
842 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
1da177e4 | 843 | */ |
19439d05 SS |
844 | void security_compute_av(u32 ssid, |
845 | u32 tsid, | |
846 | u16 orig_tclass, | |
847 | struct av_decision *avd) | |
1da177e4 | 848 | { |
c6d3aaa4 | 849 | u16 tclass; |
19439d05 | 850 | struct context *scontext = NULL, *tcontext = NULL; |
c6d3aaa4 | 851 | |
b7f3008a | 852 | read_lock(&policy_rwlock); |
19439d05 | 853 | avd_init(avd); |
c6d3aaa4 SS |
854 | if (!ss_initialized) |
855 | goto allow; | |
856 | ||
19439d05 SS |
857 | scontext = sidtab_search(&sidtab, ssid); |
858 | if (!scontext) { | |
859 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
860 | __func__, ssid); | |
861 | goto out; | |
862 | } | |
863 | ||
864 | /* permissive domain? */ | |
865 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
866 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
867 | ||
868 | tcontext = sidtab_search(&sidtab, tsid); | |
869 | if (!tcontext) { | |
870 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
871 | __func__, tsid); | |
872 | goto out; | |
873 | } | |
874 | ||
c6d3aaa4 SS |
875 | tclass = unmap_class(orig_tclass); |
876 | if (unlikely(orig_tclass && !tclass)) { | |
877 | if (policydb.allow_unknown) | |
878 | goto allow; | |
b7f3008a | 879 | goto out; |
c6d3aaa4 | 880 | } |
19439d05 | 881 | context_struct_compute_av(scontext, tcontext, tclass, avd); |
c6d3aaa4 | 882 | map_decision(orig_tclass, avd, policydb.allow_unknown); |
b7f3008a | 883 | out: |
c6d3aaa4 | 884 | read_unlock(&policy_rwlock); |
19439d05 | 885 | return; |
c6d3aaa4 SS |
886 | allow: |
887 | avd->allowed = 0xffffffff; | |
b7f3008a | 888 | goto out; |
c6d3aaa4 SS |
889 | } |
890 | ||
19439d05 SS |
891 | void security_compute_av_user(u32 ssid, |
892 | u32 tsid, | |
893 | u16 tclass, | |
894 | struct av_decision *avd) | |
c6d3aaa4 | 895 | { |
19439d05 | 896 | struct context *scontext = NULL, *tcontext = NULL; |
1da177e4 | 897 | |
19439d05 SS |
898 | read_lock(&policy_rwlock); |
899 | avd_init(avd); | |
900 | if (!ss_initialized) | |
901 | goto allow; | |
902 | ||
903 | scontext = sidtab_search(&sidtab, ssid); | |
904 | if (!scontext) { | |
905 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
906 | __func__, ssid); | |
907 | goto out; | |
1da177e4 LT |
908 | } |
909 | ||
19439d05 SS |
910 | /* permissive domain? */ |
911 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
912 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
913 | ||
914 | tcontext = sidtab_search(&sidtab, tsid); | |
915 | if (!tcontext) { | |
916 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
917 | __func__, tsid); | |
918 | goto out; | |
919 | } | |
920 | ||
921 | if (unlikely(!tclass)) { | |
922 | if (policydb.allow_unknown) | |
923 | goto allow; | |
924 | goto out; | |
925 | } | |
926 | ||
927 | context_struct_compute_av(scontext, tcontext, tclass, avd); | |
928 | out: | |
0804d113 | 929 | read_unlock(&policy_rwlock); |
19439d05 SS |
930 | return; |
931 | allow: | |
932 | avd->allowed = 0xffffffff; | |
933 | goto out; | |
1da177e4 LT |
934 | } |
935 | ||
936 | /* | |
937 | * Write the security context string representation of | |
938 | * the context structure `context' into a dynamically | |
939 | * allocated string of the correct size. Set `*scontext' | |
940 | * to point to this string and set `*scontext_len' to | |
941 | * the length of the string. | |
942 | */ | |
943 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
944 | { | |
945 | char *scontextp; | |
946 | ||
947 | *scontext = NULL; | |
948 | *scontext_len = 0; | |
949 | ||
12b29f34 SS |
950 | if (context->len) { |
951 | *scontext_len = context->len; | |
952 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
953 | if (!(*scontext)) | |
954 | return -ENOMEM; | |
955 | return 0; | |
956 | } | |
957 | ||
1da177e4 LT |
958 | /* Compute the size of the context. */ |
959 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
960 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
961 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
962 | *scontext_len += mls_compute_context_len(context); | |
963 | ||
964 | /* Allocate space for the context; caller must free this space. */ | |
965 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 966 | if (!scontextp) |
1da177e4 | 967 | return -ENOMEM; |
1da177e4 LT |
968 | *scontext = scontextp; |
969 | ||
970 | /* | |
971 | * Copy the user name, role name and type name into the context. | |
972 | */ | |
973 | sprintf(scontextp, "%s:%s:%s", | |
974 | policydb.p_user_val_to_name[context->user - 1], | |
975 | policydb.p_role_val_to_name[context->role - 1], | |
976 | policydb.p_type_val_to_name[context->type - 1]); | |
977 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
5d55a345 EP |
978 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + |
979 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
1da177e4 LT |
980 | |
981 | mls_sid_to_context(context, &scontextp); | |
982 | ||
983 | *scontextp = 0; | |
984 | ||
985 | return 0; | |
986 | } | |
987 | ||
988 | #include "initial_sid_to_string.h" | |
989 | ||
f0ee2e46 JC |
990 | const char *security_get_initial_sid_context(u32 sid) |
991 | { | |
992 | if (unlikely(sid > SECINITSID_NUM)) | |
993 | return NULL; | |
994 | return initial_sid_to_string[sid]; | |
995 | } | |
996 | ||
12b29f34 SS |
997 | static int security_sid_to_context_core(u32 sid, char **scontext, |
998 | u32 *scontext_len, int force) | |
1da177e4 LT |
999 | { |
1000 | struct context *context; | |
1001 | int rc = 0; | |
1002 | ||
4f4acf3a SS |
1003 | *scontext = NULL; |
1004 | *scontext_len = 0; | |
1005 | ||
1da177e4 LT |
1006 | if (!ss_initialized) { |
1007 | if (sid <= SECINITSID_NUM) { | |
1008 | char *scontextp; | |
1009 | ||
1010 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
5d55a345 | 1011 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
0cccca06 SH |
1012 | if (!scontextp) { |
1013 | rc = -ENOMEM; | |
1014 | goto out; | |
1015 | } | |
1da177e4 LT |
1016 | strcpy(scontextp, initial_sid_to_string[sid]); |
1017 | *scontext = scontextp; | |
1018 | goto out; | |
1019 | } | |
744ba35e EP |
1020 | printk(KERN_ERR "SELinux: %s: called before initial " |
1021 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
1022 | rc = -EINVAL; |
1023 | goto out; | |
1024 | } | |
0804d113 | 1025 | read_lock(&policy_rwlock); |
12b29f34 SS |
1026 | if (force) |
1027 | context = sidtab_search_force(&sidtab, sid); | |
1028 | else | |
1029 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 1030 | if (!context) { |
744ba35e EP |
1031 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1032 | __func__, sid); | |
1da177e4 LT |
1033 | rc = -EINVAL; |
1034 | goto out_unlock; | |
1035 | } | |
1036 | rc = context_struct_to_string(context, scontext, scontext_len); | |
1037 | out_unlock: | |
0804d113 | 1038 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1039 | out: |
1040 | return rc; | |
1041 | ||
1042 | } | |
1043 | ||
12b29f34 SS |
1044 | /** |
1045 | * security_sid_to_context - Obtain a context for a given SID. | |
1046 | * @sid: security identifier, SID | |
1047 | * @scontext: security context | |
1048 | * @scontext_len: length in bytes | |
1049 | * | |
1050 | * Write the string representation of the context associated with @sid | |
1051 | * into a dynamically allocated string of the correct size. Set @scontext | |
1052 | * to point to this string and set @scontext_len to the length of the string. | |
1053 | */ | |
1054 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 1055 | { |
12b29f34 SS |
1056 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
1057 | } | |
1058 | ||
1059 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
1060 | { | |
1061 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
1062 | } | |
1063 | ||
9a59daa0 SS |
1064 | /* |
1065 | * Caveat: Mutates scontext. | |
1066 | */ | |
12b29f34 SS |
1067 | static int string_to_context_struct(struct policydb *pol, |
1068 | struct sidtab *sidtabp, | |
9a59daa0 | 1069 | char *scontext, |
12b29f34 SS |
1070 | u32 scontext_len, |
1071 | struct context *ctx, | |
9a59daa0 | 1072 | u32 def_sid) |
12b29f34 | 1073 | { |
1da177e4 LT |
1074 | struct role_datum *role; |
1075 | struct type_datum *typdatum; | |
1076 | struct user_datum *usrdatum; | |
1077 | char *scontextp, *p, oldc; | |
1078 | int rc = 0; | |
1079 | ||
12b29f34 | 1080 | context_init(ctx); |
1da177e4 | 1081 | |
1da177e4 LT |
1082 | /* Parse the security context. */ |
1083 | ||
1084 | rc = -EINVAL; | |
9a59daa0 | 1085 | scontextp = (char *) scontext; |
1da177e4 LT |
1086 | |
1087 | /* Extract the user. */ | |
1088 | p = scontextp; | |
1089 | while (*p && *p != ':') | |
1090 | p++; | |
1091 | ||
1092 | if (*p == 0) | |
12b29f34 | 1093 | goto out; |
1da177e4 LT |
1094 | |
1095 | *p++ = 0; | |
1096 | ||
12b29f34 | 1097 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1098 | if (!usrdatum) |
12b29f34 | 1099 | goto out; |
1da177e4 | 1100 | |
12b29f34 | 1101 | ctx->user = usrdatum->value; |
1da177e4 LT |
1102 | |
1103 | /* Extract role. */ | |
1104 | scontextp = p; | |
1105 | while (*p && *p != ':') | |
1106 | p++; | |
1107 | ||
1108 | if (*p == 0) | |
12b29f34 | 1109 | goto out; |
1da177e4 LT |
1110 | |
1111 | *p++ = 0; | |
1112 | ||
12b29f34 | 1113 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1114 | if (!role) |
12b29f34 SS |
1115 | goto out; |
1116 | ctx->role = role->value; | |
1da177e4 LT |
1117 | |
1118 | /* Extract type. */ | |
1119 | scontextp = p; | |
1120 | while (*p && *p != ':') | |
1121 | p++; | |
1122 | oldc = *p; | |
1123 | *p++ = 0; | |
1124 | ||
12b29f34 | 1125 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1126 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1127 | goto out; |
1da177e4 | 1128 | |
12b29f34 | 1129 | ctx->type = typdatum->value; |
1da177e4 | 1130 | |
12b29f34 | 1131 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 1132 | if (rc) |
12b29f34 | 1133 | goto out; |
1da177e4 | 1134 | |
9a59daa0 | 1135 | if ((p - scontext) < scontext_len) { |
1da177e4 | 1136 | rc = -EINVAL; |
12b29f34 | 1137 | goto out; |
1da177e4 LT |
1138 | } |
1139 | ||
1140 | /* Check the validity of the new context. */ | |
12b29f34 | 1141 | if (!policydb_context_isvalid(pol, ctx)) { |
1da177e4 | 1142 | rc = -EINVAL; |
12b29f34 | 1143 | goto out; |
1da177e4 | 1144 | } |
12b29f34 SS |
1145 | rc = 0; |
1146 | out: | |
8e531af9 EP |
1147 | if (rc) |
1148 | context_destroy(ctx); | |
12b29f34 SS |
1149 | return rc; |
1150 | } | |
1151 | ||
1152 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
1153 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
1154 | int force) | |
1155 | { | |
9a59daa0 | 1156 | char *scontext2, *str = NULL; |
12b29f34 SS |
1157 | struct context context; |
1158 | int rc = 0; | |
1159 | ||
1160 | if (!ss_initialized) { | |
1161 | int i; | |
1162 | ||
1163 | for (i = 1; i < SECINITSID_NUM; i++) { | |
1164 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
1165 | *sid = i; | |
9a59daa0 | 1166 | return 0; |
12b29f34 SS |
1167 | } |
1168 | } | |
1169 | *sid = SECINITSID_KERNEL; | |
9a59daa0 | 1170 | return 0; |
12b29f34 SS |
1171 | } |
1172 | *sid = SECSID_NULL; | |
1173 | ||
9a59daa0 SS |
1174 | /* Copy the string so that we can modify the copy as we parse it. */ |
1175 | scontext2 = kmalloc(scontext_len+1, gfp_flags); | |
1176 | if (!scontext2) | |
1177 | return -ENOMEM; | |
1178 | memcpy(scontext2, scontext, scontext_len); | |
1179 | scontext2[scontext_len] = 0; | |
1180 | ||
1181 | if (force) { | |
1182 | /* Save another copy for storing in uninterpreted form */ | |
1183 | str = kstrdup(scontext2, gfp_flags); | |
1184 | if (!str) { | |
1185 | kfree(scontext2); | |
1186 | return -ENOMEM; | |
1187 | } | |
1188 | } | |
1189 | ||
0804d113 | 1190 | read_lock(&policy_rwlock); |
12b29f34 | 1191 | rc = string_to_context_struct(&policydb, &sidtab, |
9a59daa0 SS |
1192 | scontext2, scontext_len, |
1193 | &context, def_sid); | |
12b29f34 | 1194 | if (rc == -EINVAL && force) { |
9a59daa0 | 1195 | context.str = str; |
12b29f34 | 1196 | context.len = scontext_len; |
9a59daa0 | 1197 | str = NULL; |
12b29f34 SS |
1198 | } else if (rc) |
1199 | goto out; | |
1200 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
8e531af9 | 1201 | context_destroy(&context); |
1da177e4 | 1202 | out: |
0804d113 | 1203 | read_unlock(&policy_rwlock); |
9a59daa0 SS |
1204 | kfree(scontext2); |
1205 | kfree(str); | |
1da177e4 LT |
1206 | return rc; |
1207 | } | |
1208 | ||
f5c1d5b2 JM |
1209 | /** |
1210 | * security_context_to_sid - Obtain a SID for a given security context. | |
1211 | * @scontext: security context | |
1212 | * @scontext_len: length in bytes | |
1213 | * @sid: security identifier, SID | |
1214 | * | |
1215 | * Obtains a SID associated with the security context that | |
1216 | * has the string representation specified by @scontext. | |
1217 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1218 | * memory is available, or 0 on success. | |
1219 | */ | |
8f0cfa52 | 1220 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid) |
f5c1d5b2 JM |
1221 | { |
1222 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 | 1223 | sid, SECSID_NULL, GFP_KERNEL, 0); |
f5c1d5b2 JM |
1224 | } |
1225 | ||
1226 | /** | |
1227 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1228 | * falling back to specified default if needed. | |
1229 | * | |
1230 | * @scontext: security context | |
1231 | * @scontext_len: length in bytes | |
1232 | * @sid: security identifier, SID | |
d133a960 | 1233 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1234 | * |
1235 | * Obtains a SID associated with the security context that | |
1236 | * has the string representation specified by @scontext. | |
1237 | * The default SID is passed to the MLS layer to be used to allow | |
1238 | * kernel labeling of the MLS field if the MLS field is not present | |
1239 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1240 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1241 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1242 | * memory is available, or 0 on success. | |
1243 | */ | |
7bf570dc DH |
1244 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1245 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1246 | { |
1247 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1248 | sid, def_sid, gfp_flags, 1); |
1249 | } | |
1250 | ||
1251 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1252 | u32 *sid) | |
1253 | { | |
1254 | return security_context_to_sid_core(scontext, scontext_len, | |
1255 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1256 | } |
1257 | ||
1da177e4 LT |
1258 | static int compute_sid_handle_invalid_context( |
1259 | struct context *scontext, | |
1260 | struct context *tcontext, | |
1261 | u16 tclass, | |
1262 | struct context *newcontext) | |
1263 | { | |
1264 | char *s = NULL, *t = NULL, *n = NULL; | |
1265 | u32 slen, tlen, nlen; | |
1266 | ||
1267 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
1268 | goto out; | |
1269 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
1270 | goto out; | |
1271 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
1272 | goto out; | |
9ad9ad38 | 1273 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
1274 | "security_compute_sid: invalid context %s" |
1275 | " for scontext=%s" | |
1276 | " tcontext=%s" | |
1277 | " tclass=%s", | |
1278 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
1279 | out: | |
1280 | kfree(s); | |
1281 | kfree(t); | |
1282 | kfree(n); | |
1283 | if (!selinux_enforcing) | |
1284 | return 0; | |
1285 | return -EACCES; | |
1286 | } | |
1287 | ||
1288 | static int security_compute_sid(u32 ssid, | |
1289 | u32 tsid, | |
c6d3aaa4 | 1290 | u16 orig_tclass, |
1da177e4 | 1291 | u32 specified, |
c6d3aaa4 SS |
1292 | u32 *out_sid, |
1293 | bool kern) | |
1da177e4 LT |
1294 | { |
1295 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
1296 | struct role_trans *roletr = NULL; | |
1297 | struct avtab_key avkey; | |
1298 | struct avtab_datum *avdatum; | |
1299 | struct avtab_node *node; | |
c6d3aaa4 | 1300 | u16 tclass; |
1da177e4 LT |
1301 | int rc = 0; |
1302 | ||
1303 | if (!ss_initialized) { | |
c6d3aaa4 SS |
1304 | switch (orig_tclass) { |
1305 | case SECCLASS_PROCESS: /* kernel value */ | |
1da177e4 LT |
1306 | *out_sid = ssid; |
1307 | break; | |
1308 | default: | |
1309 | *out_sid = tsid; | |
1310 | break; | |
1311 | } | |
1312 | goto out; | |
1313 | } | |
1314 | ||
851f8a69 VY |
1315 | context_init(&newcontext); |
1316 | ||
0804d113 | 1317 | read_lock(&policy_rwlock); |
1da177e4 | 1318 | |
c6d3aaa4 SS |
1319 | if (kern) |
1320 | tclass = unmap_class(orig_tclass); | |
1321 | else | |
1322 | tclass = orig_tclass; | |
1323 | ||
1da177e4 LT |
1324 | scontext = sidtab_search(&sidtab, ssid); |
1325 | if (!scontext) { | |
744ba35e EP |
1326 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1327 | __func__, ssid); | |
1da177e4 LT |
1328 | rc = -EINVAL; |
1329 | goto out_unlock; | |
1330 | } | |
1331 | tcontext = sidtab_search(&sidtab, tsid); | |
1332 | if (!tcontext) { | |
744ba35e EP |
1333 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1334 | __func__, tsid); | |
1da177e4 LT |
1335 | rc = -EINVAL; |
1336 | goto out_unlock; | |
1337 | } | |
1338 | ||
1da177e4 LT |
1339 | /* Set the user identity. */ |
1340 | switch (specified) { | |
1341 | case AVTAB_TRANSITION: | |
1342 | case AVTAB_CHANGE: | |
1343 | /* Use the process user identity. */ | |
1344 | newcontext.user = scontext->user; | |
1345 | break; | |
1346 | case AVTAB_MEMBER: | |
1347 | /* Use the related object owner. */ | |
1348 | newcontext.user = tcontext->user; | |
1349 | break; | |
1350 | } | |
1351 | ||
1352 | /* Set the role and type to default values. */ | |
c6d3aaa4 | 1353 | if (tclass == policydb.process_class) { |
1da177e4 LT |
1354 | /* Use the current role and type of process. */ |
1355 | newcontext.role = scontext->role; | |
1356 | newcontext.type = scontext->type; | |
c6d3aaa4 | 1357 | } else { |
1da177e4 LT |
1358 | /* Use the well-defined object role. */ |
1359 | newcontext.role = OBJECT_R_VAL; | |
1360 | /* Use the type of the related object. */ | |
1361 | newcontext.type = tcontext->type; | |
1362 | } | |
1363 | ||
1364 | /* Look for a type transition/member/change rule. */ | |
1365 | avkey.source_type = scontext->type; | |
1366 | avkey.target_type = tcontext->type; | |
1367 | avkey.target_class = tclass; | |
782ebb99 SS |
1368 | avkey.specified = specified; |
1369 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1370 | |
1371 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1372 | if (!avdatum) { |
782ebb99 | 1373 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1374 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1375 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1376 | avdatum = &node->datum; |
1377 | break; | |
1378 | } | |
1379 | } | |
1380 | } | |
1381 | ||
782ebb99 | 1382 | if (avdatum) { |
1da177e4 | 1383 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 1384 | newcontext.type = avdatum->data; |
1da177e4 LT |
1385 | } |
1386 | ||
1387 | /* Check for class-specific changes. */ | |
c6d3aaa4 | 1388 | if (tclass == policydb.process_class) { |
1da177e4 LT |
1389 | if (specified & AVTAB_TRANSITION) { |
1390 | /* Look for a role transition rule. */ | |
1391 | for (roletr = policydb.role_tr; roletr; | |
1392 | roletr = roletr->next) { | |
1393 | if (roletr->role == scontext->role && | |
1394 | roletr->type == tcontext->type) { | |
1395 | /* Use the role transition rule. */ | |
1396 | newcontext.role = roletr->new_role; | |
1397 | break; | |
1398 | } | |
1399 | } | |
1400 | } | |
1da177e4 LT |
1401 | } |
1402 | ||
1403 | /* Set the MLS attributes. | |
1404 | This is done last because it may allocate memory. */ | |
1405 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
1406 | if (rc) | |
1407 | goto out_unlock; | |
1408 | ||
1409 | /* Check the validity of the context. */ | |
1410 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1411 | rc = compute_sid_handle_invalid_context(scontext, | |
1412 | tcontext, | |
1413 | tclass, | |
1414 | &newcontext); | |
1415 | if (rc) | |
1416 | goto out_unlock; | |
1417 | } | |
1418 | /* Obtain the sid for the context. */ | |
1419 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1420 | out_unlock: | |
0804d113 | 1421 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1422 | context_destroy(&newcontext); |
1423 | out: | |
1424 | return rc; | |
1425 | } | |
1426 | ||
1427 | /** | |
1428 | * security_transition_sid - Compute the SID for a new subject/object. | |
1429 | * @ssid: source security identifier | |
1430 | * @tsid: target security identifier | |
1431 | * @tclass: target security class | |
1432 | * @out_sid: security identifier for new subject/object | |
1433 | * | |
1434 | * Compute a SID to use for labeling a new subject or object in the | |
1435 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1436 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1437 | * if insufficient memory is available, or %0 if the new SID was | |
1438 | * computed successfully. | |
1439 | */ | |
1440 | int security_transition_sid(u32 ssid, | |
1441 | u32 tsid, | |
1442 | u16 tclass, | |
1443 | u32 *out_sid) | |
1444 | { | |
c6d3aaa4 SS |
1445 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, |
1446 | out_sid, true); | |
1447 | } | |
1448 | ||
1449 | int security_transition_sid_user(u32 ssid, | |
1450 | u32 tsid, | |
1451 | u16 tclass, | |
1452 | u32 *out_sid) | |
1453 | { | |
1454 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, | |
1455 | out_sid, false); | |
1da177e4 LT |
1456 | } |
1457 | ||
1458 | /** | |
1459 | * security_member_sid - Compute the SID for member selection. | |
1460 | * @ssid: source security identifier | |
1461 | * @tsid: target security identifier | |
1462 | * @tclass: target security class | |
1463 | * @out_sid: security identifier for selected member | |
1464 | * | |
1465 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1466 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1467 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1468 | * if insufficient memory is available, or %0 if the SID was | |
1469 | * computed successfully. | |
1470 | */ | |
1471 | int security_member_sid(u32 ssid, | |
1472 | u32 tsid, | |
1473 | u16 tclass, | |
1474 | u32 *out_sid) | |
1475 | { | |
c6d3aaa4 SS |
1476 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid, |
1477 | false); | |
1da177e4 LT |
1478 | } |
1479 | ||
1480 | /** | |
1481 | * security_change_sid - Compute the SID for object relabeling. | |
1482 | * @ssid: source security identifier | |
1483 | * @tsid: target security identifier | |
1484 | * @tclass: target security class | |
1485 | * @out_sid: security identifier for selected member | |
1486 | * | |
1487 | * Compute a SID to use for relabeling an object of class @tclass | |
1488 | * based on a SID pair (@ssid, @tsid). | |
1489 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1490 | * if insufficient memory is available, or %0 if the SID was | |
1491 | * computed successfully. | |
1492 | */ | |
1493 | int security_change_sid(u32 ssid, | |
1494 | u32 tsid, | |
1495 | u16 tclass, | |
1496 | u32 *out_sid) | |
1497 | { | |
c6d3aaa4 SS |
1498 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid, |
1499 | false); | |
b94c7e67 CS |
1500 | } |
1501 | ||
1da177e4 LT |
1502 | /* Clone the SID into the new SID table. */ |
1503 | static int clone_sid(u32 sid, | |
1504 | struct context *context, | |
1505 | void *arg) | |
1506 | { | |
1507 | struct sidtab *s = arg; | |
1508 | ||
42596eaf GT |
1509 | if (sid > SECINITSID_NUM) |
1510 | return sidtab_insert(s, sid, context); | |
1511 | else | |
1512 | return 0; | |
1da177e4 LT |
1513 | } |
1514 | ||
1515 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1516 | { | |
1517 | int rc = 0; | |
1518 | ||
1519 | if (selinux_enforcing) { | |
1520 | rc = -EINVAL; | |
1521 | } else { | |
1522 | char *s; | |
1523 | u32 len; | |
1524 | ||
12b29f34 SS |
1525 | if (!context_struct_to_string(context, &s, &len)) { |
1526 | printk(KERN_WARNING | |
1527 | "SELinux: Context %s would be invalid if enforcing\n", | |
1528 | s); | |
1529 | kfree(s); | |
1530 | } | |
1da177e4 LT |
1531 | } |
1532 | return rc; | |
1533 | } | |
1534 | ||
1535 | struct convert_context_args { | |
1536 | struct policydb *oldp; | |
1537 | struct policydb *newp; | |
1538 | }; | |
1539 | ||
1540 | /* | |
1541 | * Convert the values in the security context | |
1542 | * structure `c' from the values specified | |
1543 | * in the policy `p->oldp' to the values specified | |
1544 | * in the policy `p->newp'. Verify that the | |
1545 | * context is valid under the new policy. | |
1546 | */ | |
1547 | static int convert_context(u32 key, | |
1548 | struct context *c, | |
1549 | void *p) | |
1550 | { | |
1551 | struct convert_context_args *args; | |
1552 | struct context oldc; | |
1553 | struct role_datum *role; | |
1554 | struct type_datum *typdatum; | |
1555 | struct user_datum *usrdatum; | |
1556 | char *s; | |
1557 | u32 len; | |
42596eaf GT |
1558 | int rc = 0; |
1559 | ||
1560 | if (key <= SECINITSID_NUM) | |
1561 | goto out; | |
1da177e4 LT |
1562 | |
1563 | args = p; | |
1564 | ||
12b29f34 SS |
1565 | if (c->str) { |
1566 | struct context ctx; | |
9a59daa0 SS |
1567 | s = kstrdup(c->str, GFP_KERNEL); |
1568 | if (!s) { | |
1569 | rc = -ENOMEM; | |
1570 | goto out; | |
1571 | } | |
1572 | rc = string_to_context_struct(args->newp, NULL, s, | |
1573 | c->len, &ctx, SECSID_NULL); | |
1574 | kfree(s); | |
12b29f34 SS |
1575 | if (!rc) { |
1576 | printk(KERN_INFO | |
1577 | "SELinux: Context %s became valid (mapped).\n", | |
1578 | c->str); | |
1579 | /* Replace string with mapped representation. */ | |
1580 | kfree(c->str); | |
1581 | memcpy(c, &ctx, sizeof(*c)); | |
1582 | goto out; | |
1583 | } else if (rc == -EINVAL) { | |
1584 | /* Retain string representation for later mapping. */ | |
1585 | rc = 0; | |
1586 | goto out; | |
1587 | } else { | |
1588 | /* Other error condition, e.g. ENOMEM. */ | |
1589 | printk(KERN_ERR | |
1590 | "SELinux: Unable to map context %s, rc = %d.\n", | |
1591 | c->str, -rc); | |
1592 | goto out; | |
1593 | } | |
1594 | } | |
1595 | ||
1da177e4 LT |
1596 | rc = context_cpy(&oldc, c); |
1597 | if (rc) | |
1598 | goto out; | |
1599 | ||
1600 | rc = -EINVAL; | |
1601 | ||
1602 | /* Convert the user. */ | |
1603 | usrdatum = hashtab_search(args->newp->p_users.table, | |
5d55a345 EP |
1604 | args->oldp->p_user_val_to_name[c->user - 1]); |
1605 | if (!usrdatum) | |
1da177e4 | 1606 | goto bad; |
1da177e4 LT |
1607 | c->user = usrdatum->value; |
1608 | ||
1609 | /* Convert the role. */ | |
1610 | role = hashtab_search(args->newp->p_roles.table, | |
5d55a345 EP |
1611 | args->oldp->p_role_val_to_name[c->role - 1]); |
1612 | if (!role) | |
1da177e4 | 1613 | goto bad; |
1da177e4 LT |
1614 | c->role = role->value; |
1615 | ||
1616 | /* Convert the type. */ | |
1617 | typdatum = hashtab_search(args->newp->p_types.table, | |
5d55a345 EP |
1618 | args->oldp->p_type_val_to_name[c->type - 1]); |
1619 | if (!typdatum) | |
1da177e4 | 1620 | goto bad; |
1da177e4 LT |
1621 | c->type = typdatum->value; |
1622 | ||
1623 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1624 | if (rc) | |
1625 | goto bad; | |
1626 | ||
1627 | /* Check the validity of the new context. */ | |
1628 | if (!policydb_context_isvalid(args->newp, c)) { | |
1629 | rc = convert_context_handle_invalid_context(&oldc); | |
1630 | if (rc) | |
1631 | goto bad; | |
1632 | } | |
1633 | ||
1634 | context_destroy(&oldc); | |
12b29f34 | 1635 | rc = 0; |
1da177e4 LT |
1636 | out: |
1637 | return rc; | |
1638 | bad: | |
12b29f34 SS |
1639 | /* Map old representation to string and save it. */ |
1640 | if (context_struct_to_string(&oldc, &s, &len)) | |
1641 | return -ENOMEM; | |
1da177e4 | 1642 | context_destroy(&oldc); |
12b29f34 SS |
1643 | context_destroy(c); |
1644 | c->str = s; | |
1645 | c->len = len; | |
1646 | printk(KERN_INFO | |
1647 | "SELinux: Context %s became invalid (unmapped).\n", | |
1648 | c->str); | |
1649 | rc = 0; | |
1da177e4 LT |
1650 | goto out; |
1651 | } | |
1652 | ||
3bb56b25 PM |
1653 | static void security_load_policycaps(void) |
1654 | { | |
1655 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1656 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1657 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1658 | POLICYDB_CAPABILITY_OPENPERM); | |
3bb56b25 PM |
1659 | } |
1660 | ||
1da177e4 | 1661 | extern void selinux_complete_init(void); |
e900a7d9 | 1662 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1663 | |
1664 | /** | |
1665 | * security_load_policy - Load a security policy configuration. | |
1666 | * @data: binary policy data | |
1667 | * @len: length of data in bytes | |
1668 | * | |
1669 | * Load a new set of security policy configuration data, | |
1670 | * validate it and convert the SID table as necessary. | |
1671 | * This function will flush the access vector cache after | |
1672 | * loading the new policy. | |
1673 | */ | |
1674 | int security_load_policy(void *data, size_t len) | |
1675 | { | |
1676 | struct policydb oldpolicydb, newpolicydb; | |
1677 | struct sidtab oldsidtab, newsidtab; | |
c6d3aaa4 | 1678 | struct selinux_mapping *oldmap, *map = NULL; |
1da177e4 LT |
1679 | struct convert_context_args args; |
1680 | u32 seqno; | |
c6d3aaa4 | 1681 | u16 map_size; |
1da177e4 LT |
1682 | int rc = 0; |
1683 | struct policy_file file = { data, len }, *fp = &file; | |
1684 | ||
1da177e4 LT |
1685 | if (!ss_initialized) { |
1686 | avtab_cache_init(); | |
1687 | if (policydb_read(&policydb, fp)) { | |
1da177e4 LT |
1688 | avtab_cache_destroy(); |
1689 | return -EINVAL; | |
1690 | } | |
c6d3aaa4 SS |
1691 | if (selinux_set_mapping(&policydb, secclass_map, |
1692 | ¤t_mapping, | |
1693 | ¤t_mapping_size)) { | |
1da177e4 LT |
1694 | policydb_destroy(&policydb); |
1695 | avtab_cache_destroy(); | |
1696 | return -EINVAL; | |
1697 | } | |
c6d3aaa4 | 1698 | if (policydb_load_isids(&policydb, &sidtab)) { |
b94c7e67 CS |
1699 | policydb_destroy(&policydb); |
1700 | avtab_cache_destroy(); | |
1701 | return -EINVAL; | |
1702 | } | |
3bb56b25 | 1703 | security_load_policycaps(); |
1da177e4 | 1704 | ss_initialized = 1; |
4c443d1b | 1705 | seqno = ++latest_granting; |
1da177e4 | 1706 | selinux_complete_init(); |
4c443d1b SS |
1707 | avc_ss_reset(seqno); |
1708 | selnl_notify_policyload(seqno); | |
7420ed23 | 1709 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1710 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1711 | return 0; |
1712 | } | |
1713 | ||
1714 | #if 0 | |
1715 | sidtab_hash_eval(&sidtab, "sids"); | |
1716 | #endif | |
1717 | ||
89abd0ac | 1718 | if (policydb_read(&newpolicydb, fp)) |
1da177e4 | 1719 | return -EINVAL; |
1da177e4 | 1720 | |
42596eaf GT |
1721 | rc = policydb_load_isids(&newpolicydb, &newsidtab); |
1722 | if (rc) { | |
1723 | printk(KERN_ERR "SELinux: unable to load the initial SIDs\n"); | |
12b29f34 | 1724 | policydb_destroy(&newpolicydb); |
42596eaf | 1725 | return rc; |
12b29f34 | 1726 | } |
1da177e4 | 1727 | |
c6d3aaa4 SS |
1728 | if (selinux_set_mapping(&newpolicydb, secclass_map, |
1729 | &map, &map_size)) | |
b94c7e67 | 1730 | goto err; |
b94c7e67 | 1731 | |
e900a7d9 SS |
1732 | rc = security_preserve_bools(&newpolicydb); |
1733 | if (rc) { | |
454d972c | 1734 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
1735 | goto err; |
1736 | } | |
1737 | ||
1da177e4 LT |
1738 | /* Clone the SID table. */ |
1739 | sidtab_shutdown(&sidtab); | |
1740 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1741 | rc = -ENOMEM; | |
1742 | goto err; | |
1743 | } | |
1744 | ||
12b29f34 SS |
1745 | /* |
1746 | * Convert the internal representations of contexts | |
1747 | * in the new SID table. | |
1748 | */ | |
1da177e4 LT |
1749 | args.oldp = &policydb; |
1750 | args.newp = &newpolicydb; | |
12b29f34 SS |
1751 | rc = sidtab_map(&newsidtab, convert_context, &args); |
1752 | if (rc) | |
1753 | goto err; | |
1da177e4 LT |
1754 | |
1755 | /* Save the old policydb and SID table to free later. */ | |
1756 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1757 | sidtab_set(&oldsidtab, &sidtab); | |
1758 | ||
1759 | /* Install the new policydb and SID table. */ | |
0804d113 | 1760 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
1761 | memcpy(&policydb, &newpolicydb, sizeof policydb); |
1762 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1763 | security_load_policycaps(); |
c6d3aaa4 SS |
1764 | oldmap = current_mapping; |
1765 | current_mapping = map; | |
1766 | current_mapping_size = map_size; | |
1da177e4 | 1767 | seqno = ++latest_granting; |
0804d113 | 1768 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
1769 | |
1770 | /* Free the old policydb and SID table. */ | |
1771 | policydb_destroy(&oldpolicydb); | |
1772 | sidtab_destroy(&oldsidtab); | |
c6d3aaa4 | 1773 | kfree(oldmap); |
1da177e4 LT |
1774 | |
1775 | avc_ss_reset(seqno); | |
1776 | selnl_notify_policyload(seqno); | |
7420ed23 | 1777 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1778 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1779 | |
1780 | return 0; | |
1781 | ||
1782 | err: | |
c6d3aaa4 | 1783 | kfree(map); |
1da177e4 LT |
1784 | sidtab_destroy(&newsidtab); |
1785 | policydb_destroy(&newpolicydb); | |
1786 | return rc; | |
1787 | ||
1788 | } | |
1789 | ||
1790 | /** | |
1791 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
1792 | * @protocol: protocol number |
1793 | * @port: port number | |
1794 | * @out_sid: security identifier | |
1795 | */ | |
3e112172 | 1796 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
1797 | { |
1798 | struct ocontext *c; | |
1799 | int rc = 0; | |
1800 | ||
0804d113 | 1801 | read_lock(&policy_rwlock); |
1da177e4 LT |
1802 | |
1803 | c = policydb.ocontexts[OCON_PORT]; | |
1804 | while (c) { | |
1805 | if (c->u.port.protocol == protocol && | |
1806 | c->u.port.low_port <= port && | |
1807 | c->u.port.high_port >= port) | |
1808 | break; | |
1809 | c = c->next; | |
1810 | } | |
1811 | ||
1812 | if (c) { | |
1813 | if (!c->sid[0]) { | |
1814 | rc = sidtab_context_to_sid(&sidtab, | |
1815 | &c->context[0], | |
1816 | &c->sid[0]); | |
1817 | if (rc) | |
1818 | goto out; | |
1819 | } | |
1820 | *out_sid = c->sid[0]; | |
1821 | } else { | |
1822 | *out_sid = SECINITSID_PORT; | |
1823 | } | |
1824 | ||
1825 | out: | |
0804d113 | 1826 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1827 | return rc; |
1828 | } | |
1829 | ||
1830 | /** | |
1831 | * security_netif_sid - Obtain the SID for a network interface. | |
1832 | * @name: interface name | |
1833 | * @if_sid: interface SID | |
1da177e4 | 1834 | */ |
e8bfdb9d | 1835 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
1836 | { |
1837 | int rc = 0; | |
1838 | struct ocontext *c; | |
1839 | ||
0804d113 | 1840 | read_lock(&policy_rwlock); |
1da177e4 LT |
1841 | |
1842 | c = policydb.ocontexts[OCON_NETIF]; | |
1843 | while (c) { | |
1844 | if (strcmp(name, c->u.name) == 0) | |
1845 | break; | |
1846 | c = c->next; | |
1847 | } | |
1848 | ||
1849 | if (c) { | |
1850 | if (!c->sid[0] || !c->sid[1]) { | |
1851 | rc = sidtab_context_to_sid(&sidtab, | |
1852 | &c->context[0], | |
1853 | &c->sid[0]); | |
1854 | if (rc) | |
1855 | goto out; | |
1856 | rc = sidtab_context_to_sid(&sidtab, | |
1857 | &c->context[1], | |
1858 | &c->sid[1]); | |
1859 | if (rc) | |
1860 | goto out; | |
1861 | } | |
1862 | *if_sid = c->sid[0]; | |
e8bfdb9d | 1863 | } else |
1da177e4 | 1864 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
1865 | |
1866 | out: | |
0804d113 | 1867 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1868 | return rc; |
1869 | } | |
1870 | ||
1871 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1872 | { | |
1873 | int i, fail = 0; | |
1874 | ||
5d55a345 EP |
1875 | for (i = 0; i < 4; i++) |
1876 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
1877 | fail = 1; |
1878 | break; | |
1879 | } | |
1880 | ||
1881 | return !fail; | |
1882 | } | |
1883 | ||
1884 | /** | |
1885 | * security_node_sid - Obtain the SID for a node (host). | |
1886 | * @domain: communication domain aka address family | |
1887 | * @addrp: address | |
1888 | * @addrlen: address length in bytes | |
1889 | * @out_sid: security identifier | |
1890 | */ | |
1891 | int security_node_sid(u16 domain, | |
1892 | void *addrp, | |
1893 | u32 addrlen, | |
1894 | u32 *out_sid) | |
1895 | { | |
1896 | int rc = 0; | |
1897 | struct ocontext *c; | |
1898 | ||
0804d113 | 1899 | read_lock(&policy_rwlock); |
1da177e4 LT |
1900 | |
1901 | switch (domain) { | |
1902 | case AF_INET: { | |
1903 | u32 addr; | |
1904 | ||
1905 | if (addrlen != sizeof(u32)) { | |
1906 | rc = -EINVAL; | |
1907 | goto out; | |
1908 | } | |
1909 | ||
1910 | addr = *((u32 *)addrp); | |
1911 | ||
1912 | c = policydb.ocontexts[OCON_NODE]; | |
1913 | while (c) { | |
1914 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1915 | break; | |
1916 | c = c->next; | |
1917 | } | |
1918 | break; | |
1919 | } | |
1920 | ||
1921 | case AF_INET6: | |
1922 | if (addrlen != sizeof(u64) * 2) { | |
1923 | rc = -EINVAL; | |
1924 | goto out; | |
1925 | } | |
1926 | c = policydb.ocontexts[OCON_NODE6]; | |
1927 | while (c) { | |
1928 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1929 | c->u.node6.mask)) | |
1930 | break; | |
1931 | c = c->next; | |
1932 | } | |
1933 | break; | |
1934 | ||
1935 | default: | |
1936 | *out_sid = SECINITSID_NODE; | |
1937 | goto out; | |
1938 | } | |
1939 | ||
1940 | if (c) { | |
1941 | if (!c->sid[0]) { | |
1942 | rc = sidtab_context_to_sid(&sidtab, | |
1943 | &c->context[0], | |
1944 | &c->sid[0]); | |
1945 | if (rc) | |
1946 | goto out; | |
1947 | } | |
1948 | *out_sid = c->sid[0]; | |
1949 | } else { | |
1950 | *out_sid = SECINITSID_NODE; | |
1951 | } | |
1952 | ||
1953 | out: | |
0804d113 | 1954 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1955 | return rc; |
1956 | } | |
1957 | ||
1958 | #define SIDS_NEL 25 | |
1959 | ||
1960 | /** | |
1961 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
1962 | * @fromsid: starting SID | |
1963 | * @username: username | |
1964 | * @sids: array of reachable SIDs for user | |
1965 | * @nel: number of elements in @sids | |
1966 | * | |
1967 | * Generate the set of SIDs for legal security contexts | |
1968 | * for a given user that can be reached by @fromsid. | |
1969 | * Set *@sids to point to a dynamically allocated | |
1970 | * array containing the set of SIDs. Set *@nel to the | |
1971 | * number of elements in the array. | |
1972 | */ | |
1973 | ||
1974 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 1975 | char *username, |
1da177e4 LT |
1976 | u32 **sids, |
1977 | u32 *nel) | |
1978 | { | |
1979 | struct context *fromcon, usercon; | |
2c3c05db | 1980 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
1981 | u32 mynel = 0, maxnel = SIDS_NEL; |
1982 | struct user_datum *user; | |
1983 | struct role_datum *role; | |
782ebb99 | 1984 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
1985 | int rc = 0, i, j; |
1986 | ||
2c3c05db SS |
1987 | *sids = NULL; |
1988 | *nel = 0; | |
1989 | ||
1990 | if (!ss_initialized) | |
1da177e4 | 1991 | goto out; |
1da177e4 | 1992 | |
0804d113 | 1993 | read_lock(&policy_rwlock); |
1da177e4 | 1994 | |
12b29f34 SS |
1995 | context_init(&usercon); |
1996 | ||
1da177e4 LT |
1997 | fromcon = sidtab_search(&sidtab, fromsid); |
1998 | if (!fromcon) { | |
1999 | rc = -EINVAL; | |
2000 | goto out_unlock; | |
2001 | } | |
2002 | ||
2003 | user = hashtab_search(policydb.p_users.table, username); | |
2004 | if (!user) { | |
2005 | rc = -EINVAL; | |
2006 | goto out_unlock; | |
2007 | } | |
2008 | usercon.user = user->value; | |
2009 | ||
89d155ef | 2010 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
2011 | if (!mysids) { |
2012 | rc = -ENOMEM; | |
2013 | goto out_unlock; | |
2014 | } | |
1da177e4 | 2015 | |
9fe79ad1 | 2016 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 LT |
2017 | role = policydb.role_val_to_struct[i]; |
2018 | usercon.role = i+1; | |
9fe79ad1 | 2019 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
1da177e4 LT |
2020 | usercon.type = j+1; |
2021 | ||
2022 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
2023 | continue; | |
2024 | ||
1da177e4 | 2025 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 2026 | if (rc) |
1da177e4 | 2027 | goto out_unlock; |
1da177e4 LT |
2028 | if (mynel < maxnel) { |
2029 | mysids[mynel++] = sid; | |
2030 | } else { | |
2031 | maxnel += SIDS_NEL; | |
89d155ef | 2032 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
2033 | if (!mysids2) { |
2034 | rc = -ENOMEM; | |
1da177e4 LT |
2035 | goto out_unlock; |
2036 | } | |
1da177e4 LT |
2037 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2038 | kfree(mysids); | |
2039 | mysids = mysids2; | |
2040 | mysids[mynel++] = sid; | |
2041 | } | |
2042 | } | |
2043 | } | |
2044 | ||
1da177e4 | 2045 | out_unlock: |
0804d113 | 2046 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2047 | if (rc || !mynel) { |
2048 | kfree(mysids); | |
2049 | goto out; | |
2050 | } | |
2051 | ||
2052 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
2053 | if (!mysids2) { | |
2054 | rc = -ENOMEM; | |
2055 | kfree(mysids); | |
2056 | goto out; | |
2057 | } | |
2058 | for (i = 0, j = 0; i < mynel; i++) { | |
2059 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
c6d3aaa4 | 2060 | SECCLASS_PROCESS, /* kernel value */ |
2c3c05db SS |
2061 | PROCESS__TRANSITION, AVC_STRICT, |
2062 | NULL); | |
2063 | if (!rc) | |
2064 | mysids2[j++] = mysids[i]; | |
2065 | cond_resched(); | |
2066 | } | |
2067 | rc = 0; | |
2068 | kfree(mysids); | |
2069 | *sids = mysids2; | |
2070 | *nel = j; | |
1da177e4 LT |
2071 | out: |
2072 | return rc; | |
2073 | } | |
2074 | ||
2075 | /** | |
2076 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2077 | * @fstype: filesystem type | |
2078 | * @path: path from root of mount | |
2079 | * @sclass: file security class | |
2080 | * @sid: SID for path | |
2081 | * | |
2082 | * Obtain a SID to use for a file in a filesystem that | |
2083 | * cannot support xattr or use a fixed labeling behavior like | |
2084 | * transition SIDs or task SIDs. | |
2085 | */ | |
2086 | int security_genfs_sid(const char *fstype, | |
5d55a345 | 2087 | char *path, |
c6d3aaa4 | 2088 | u16 orig_sclass, |
1da177e4 LT |
2089 | u32 *sid) |
2090 | { | |
2091 | int len; | |
c6d3aaa4 | 2092 | u16 sclass; |
1da177e4 LT |
2093 | struct genfs *genfs; |
2094 | struct ocontext *c; | |
2095 | int rc = 0, cmp = 0; | |
2096 | ||
b1aa5301 SS |
2097 | while (path[0] == '/' && path[1] == '/') |
2098 | path++; | |
2099 | ||
0804d113 | 2100 | read_lock(&policy_rwlock); |
1da177e4 | 2101 | |
c6d3aaa4 SS |
2102 | sclass = unmap_class(orig_sclass); |
2103 | ||
1da177e4 LT |
2104 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { |
2105 | cmp = strcmp(fstype, genfs->fstype); | |
2106 | if (cmp <= 0) | |
2107 | break; | |
2108 | } | |
2109 | ||
2110 | if (!genfs || cmp) { | |
2111 | *sid = SECINITSID_UNLABELED; | |
2112 | rc = -ENOENT; | |
2113 | goto out; | |
2114 | } | |
2115 | ||
2116 | for (c = genfs->head; c; c = c->next) { | |
2117 | len = strlen(c->u.name); | |
2118 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2119 | (strncmp(c->u.name, path, len) == 0)) | |
2120 | break; | |
2121 | } | |
2122 | ||
2123 | if (!c) { | |
2124 | *sid = SECINITSID_UNLABELED; | |
2125 | rc = -ENOENT; | |
2126 | goto out; | |
2127 | } | |
2128 | ||
2129 | if (!c->sid[0]) { | |
2130 | rc = sidtab_context_to_sid(&sidtab, | |
2131 | &c->context[0], | |
2132 | &c->sid[0]); | |
2133 | if (rc) | |
2134 | goto out; | |
2135 | } | |
2136 | ||
2137 | *sid = c->sid[0]; | |
2138 | out: | |
0804d113 | 2139 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2140 | return rc; |
2141 | } | |
2142 | ||
2143 | /** | |
2144 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
2145 | * @fstype: filesystem type | |
2146 | * @behavior: labeling behavior | |
2147 | * @sid: SID for filesystem (superblock) | |
2148 | */ | |
2149 | int security_fs_use( | |
2150 | const char *fstype, | |
2151 | unsigned int *behavior, | |
089be43e | 2152 | u32 *sid) |
1da177e4 LT |
2153 | { |
2154 | int rc = 0; | |
2155 | struct ocontext *c; | |
2156 | ||
0804d113 | 2157 | read_lock(&policy_rwlock); |
1da177e4 LT |
2158 | |
2159 | c = policydb.ocontexts[OCON_FSUSE]; | |
2160 | while (c) { | |
2161 | if (strcmp(fstype, c->u.name) == 0) | |
2162 | break; | |
2163 | c = c->next; | |
2164 | } | |
2165 | ||
2166 | if (c) { | |
2167 | *behavior = c->v.behavior; | |
2168 | if (!c->sid[0]) { | |
2169 | rc = sidtab_context_to_sid(&sidtab, | |
2170 | &c->context[0], | |
2171 | &c->sid[0]); | |
2172 | if (rc) | |
2173 | goto out; | |
2174 | } | |
2175 | *sid = c->sid[0]; | |
2176 | } else { | |
089be43e JM |
2177 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); |
2178 | if (rc) { | |
2179 | *behavior = SECURITY_FS_USE_NONE; | |
2180 | rc = 0; | |
2181 | } else { | |
2182 | *behavior = SECURITY_FS_USE_GENFS; | |
2183 | } | |
1da177e4 LT |
2184 | } |
2185 | ||
2186 | out: | |
0804d113 | 2187 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2188 | return rc; |
2189 | } | |
2190 | ||
2191 | int security_get_bools(int *len, char ***names, int **values) | |
2192 | { | |
2193 | int i, rc = -ENOMEM; | |
2194 | ||
0804d113 | 2195 | read_lock(&policy_rwlock); |
1da177e4 LT |
2196 | *names = NULL; |
2197 | *values = NULL; | |
2198 | ||
2199 | *len = policydb.p_bools.nprim; | |
2200 | if (!*len) { | |
2201 | rc = 0; | |
2202 | goto out; | |
2203 | } | |
2204 | ||
5d55a345 | 2205 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); |
1da177e4 LT |
2206 | if (!*names) |
2207 | goto err; | |
1da177e4 | 2208 | |
e0795cf4 | 2209 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
2210 | if (!*values) |
2211 | goto err; | |
2212 | ||
2213 | for (i = 0; i < *len; i++) { | |
2214 | size_t name_len; | |
2215 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
2216 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
5d55a345 | 2217 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
2218 | if (!(*names)[i]) |
2219 | goto err; | |
2220 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
2221 | (*names)[i][name_len - 1] = 0; | |
2222 | } | |
2223 | rc = 0; | |
2224 | out: | |
0804d113 | 2225 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2226 | return rc; |
2227 | err: | |
2228 | if (*names) { | |
2229 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2230 | kfree((*names)[i]); |
1da177e4 | 2231 | } |
9a5f04bf | 2232 | kfree(*values); |
1da177e4 LT |
2233 | goto out; |
2234 | } | |
2235 | ||
2236 | ||
2237 | int security_set_bools(int len, int *values) | |
2238 | { | |
2239 | int i, rc = 0; | |
2240 | int lenp, seqno = 0; | |
2241 | struct cond_node *cur; | |
2242 | ||
0804d113 | 2243 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
2244 | |
2245 | lenp = policydb.p_bools.nprim; | |
2246 | if (len != lenp) { | |
2247 | rc = -EFAULT; | |
2248 | goto out; | |
2249 | } | |
2250 | ||
1da177e4 | 2251 | for (i = 0; i < len; i++) { |
af601e46 SG |
2252 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2253 | audit_log(current->audit_context, GFP_ATOMIC, | |
2254 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2255 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
af601e46 SG |
2256 | policydb.p_bool_val_to_name[i], |
2257 | !!values[i], | |
2258 | policydb.bool_val_to_struct[i]->state, | |
4746ec5b EP |
2259 | audit_get_loginuid(current), |
2260 | audit_get_sessionid(current)); | |
af601e46 | 2261 | } |
5d55a345 | 2262 | if (values[i]) |
1da177e4 | 2263 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2264 | else |
1da177e4 | 2265 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2266 | } |
1da177e4 | 2267 | |
dbc74c65 | 2268 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2269 | rc = evaluate_cond_node(&policydb, cur); |
2270 | if (rc) | |
2271 | goto out; | |
2272 | } | |
2273 | ||
2274 | seqno = ++latest_granting; | |
2275 | ||
2276 | out: | |
0804d113 | 2277 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2278 | if (!rc) { |
2279 | avc_ss_reset(seqno); | |
2280 | selnl_notify_policyload(seqno); | |
342a0cff | 2281 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2282 | } |
2283 | return rc; | |
2284 | } | |
2285 | ||
2286 | int security_get_bool_value(int bool) | |
2287 | { | |
2288 | int rc = 0; | |
2289 | int len; | |
2290 | ||
0804d113 | 2291 | read_lock(&policy_rwlock); |
1da177e4 LT |
2292 | |
2293 | len = policydb.p_bools.nprim; | |
2294 | if (bool >= len) { | |
2295 | rc = -EFAULT; | |
2296 | goto out; | |
2297 | } | |
2298 | ||
2299 | rc = policydb.bool_val_to_struct[bool]->state; | |
2300 | out: | |
0804d113 | 2301 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2302 | return rc; |
2303 | } | |
376bd9cb | 2304 | |
e900a7d9 SS |
2305 | static int security_preserve_bools(struct policydb *p) |
2306 | { | |
2307 | int rc, nbools = 0, *bvalues = NULL, i; | |
2308 | char **bnames = NULL; | |
2309 | struct cond_bool_datum *booldatum; | |
2310 | struct cond_node *cur; | |
2311 | ||
2312 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2313 | if (rc) | |
2314 | goto out; | |
2315 | for (i = 0; i < nbools; i++) { | |
2316 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2317 | if (booldatum) | |
2318 | booldatum->state = bvalues[i]; | |
2319 | } | |
dbc74c65 | 2320 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2321 | rc = evaluate_cond_node(p, cur); |
2322 | if (rc) | |
2323 | goto out; | |
2324 | } | |
2325 | ||
2326 | out: | |
2327 | if (bnames) { | |
2328 | for (i = 0; i < nbools; i++) | |
2329 | kfree(bnames[i]); | |
2330 | } | |
2331 | kfree(bnames); | |
2332 | kfree(bvalues); | |
2333 | return rc; | |
2334 | } | |
2335 | ||
08554d6b VY |
2336 | /* |
2337 | * security_sid_mls_copy() - computes a new sid based on the given | |
2338 | * sid and the mls portion of mls_sid. | |
2339 | */ | |
2340 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2341 | { | |
2342 | struct context *context1; | |
2343 | struct context *context2; | |
2344 | struct context newcon; | |
2345 | char *s; | |
2346 | u32 len; | |
2347 | int rc = 0; | |
2348 | ||
4eb327b5 | 2349 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
2350 | *new_sid = sid; |
2351 | goto out; | |
2352 | } | |
2353 | ||
2354 | context_init(&newcon); | |
2355 | ||
0804d113 | 2356 | read_lock(&policy_rwlock); |
08554d6b VY |
2357 | context1 = sidtab_search(&sidtab, sid); |
2358 | if (!context1) { | |
744ba35e EP |
2359 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2360 | __func__, sid); | |
08554d6b VY |
2361 | rc = -EINVAL; |
2362 | goto out_unlock; | |
2363 | } | |
2364 | ||
2365 | context2 = sidtab_search(&sidtab, mls_sid); | |
2366 | if (!context2) { | |
744ba35e EP |
2367 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2368 | __func__, mls_sid); | |
08554d6b VY |
2369 | rc = -EINVAL; |
2370 | goto out_unlock; | |
2371 | } | |
2372 | ||
2373 | newcon.user = context1->user; | |
2374 | newcon.role = context1->role; | |
2375 | newcon.type = context1->type; | |
0efc61ea | 2376 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2377 | if (rc) |
2378 | goto out_unlock; | |
2379 | ||
08554d6b VY |
2380 | /* Check the validity of the new context. */ |
2381 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2382 | rc = convert_context_handle_invalid_context(&newcon); | |
2383 | if (rc) | |
2384 | goto bad; | |
2385 | } | |
2386 | ||
2387 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
2388 | goto out_unlock; | |
2389 | ||
2390 | bad: | |
2391 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2392 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2393 | "security_sid_mls_copy: invalid context %s", s); | |
2394 | kfree(s); | |
2395 | } | |
2396 | ||
2397 | out_unlock: | |
0804d113 | 2398 | read_unlock(&policy_rwlock); |
08554d6b VY |
2399 | context_destroy(&newcon); |
2400 | out: | |
2401 | return rc; | |
2402 | } | |
2403 | ||
220deb96 PM |
2404 | /** |
2405 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2406 | * @nlbl_sid: NetLabel SID | |
2407 | * @nlbl_type: NetLabel labeling protocol type | |
2408 | * @xfrm_sid: XFRM SID | |
2409 | * | |
2410 | * Description: | |
2411 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2412 | * resolved into a single SID it is returned via @peer_sid and the function | |
2413 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2414 | * returns a negative value. A table summarizing the behavior is below: | |
2415 | * | |
2416 | * | function return | @sid | |
2417 | * ------------------------------+-----------------+----------------- | |
2418 | * no peer labels | 0 | SECSID_NULL | |
2419 | * single peer label | 0 | <peer_label> | |
2420 | * multiple, consistent labels | 0 | <peer_label> | |
2421 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2422 | * | |
2423 | */ | |
2424 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2425 | u32 xfrm_sid, | |
2426 | u32 *peer_sid) | |
2427 | { | |
2428 | int rc; | |
2429 | struct context *nlbl_ctx; | |
2430 | struct context *xfrm_ctx; | |
2431 | ||
2432 | /* handle the common (which also happens to be the set of easy) cases | |
2433 | * right away, these two if statements catch everything involving a | |
2434 | * single or absent peer SID/label */ | |
2435 | if (xfrm_sid == SECSID_NULL) { | |
2436 | *peer_sid = nlbl_sid; | |
2437 | return 0; | |
2438 | } | |
2439 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2440 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2441 | * is present */ | |
2442 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2443 | *peer_sid = xfrm_sid; | |
2444 | return 0; | |
2445 | } | |
2446 | ||
2447 | /* we don't need to check ss_initialized here since the only way both | |
2448 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2449 | * security server was initialized and ss_initialized was true */ | |
2450 | if (!selinux_mls_enabled) { | |
2451 | *peer_sid = SECSID_NULL; | |
2452 | return 0; | |
2453 | } | |
2454 | ||
0804d113 | 2455 | read_lock(&policy_rwlock); |
220deb96 PM |
2456 | |
2457 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); | |
2458 | if (!nlbl_ctx) { | |
744ba35e EP |
2459 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2460 | __func__, nlbl_sid); | |
220deb96 PM |
2461 | rc = -EINVAL; |
2462 | goto out_slowpath; | |
2463 | } | |
2464 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); | |
2465 | if (!xfrm_ctx) { | |
744ba35e EP |
2466 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2467 | __func__, xfrm_sid); | |
220deb96 PM |
2468 | rc = -EINVAL; |
2469 | goto out_slowpath; | |
2470 | } | |
2471 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
2472 | ||
2473 | out_slowpath: | |
0804d113 | 2474 | read_unlock(&policy_rwlock); |
220deb96 PM |
2475 | if (rc == 0) |
2476 | /* at present NetLabel SIDs/labels really only carry MLS | |
2477 | * information so if the MLS portion of the NetLabel SID | |
2478 | * matches the MLS portion of the labeled XFRM SID/label | |
2479 | * then pass along the XFRM SID as it is the most | |
2480 | * expressive */ | |
2481 | *peer_sid = xfrm_sid; | |
2482 | else | |
2483 | *peer_sid = SECSID_NULL; | |
2484 | return rc; | |
2485 | } | |
2486 | ||
55fcf09b CP |
2487 | static int get_classes_callback(void *k, void *d, void *args) |
2488 | { | |
2489 | struct class_datum *datum = d; | |
2490 | char *name = k, **classes = args; | |
2491 | int value = datum->value - 1; | |
2492 | ||
2493 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2494 | if (!classes[value]) | |
2495 | return -ENOMEM; | |
2496 | ||
2497 | return 0; | |
2498 | } | |
2499 | ||
2500 | int security_get_classes(char ***classes, int *nclasses) | |
2501 | { | |
2502 | int rc = -ENOMEM; | |
2503 | ||
0804d113 | 2504 | read_lock(&policy_rwlock); |
55fcf09b CP |
2505 | |
2506 | *nclasses = policydb.p_classes.nprim; | |
9f59f90b | 2507 | *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC); |
55fcf09b CP |
2508 | if (!*classes) |
2509 | goto out; | |
2510 | ||
2511 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2512 | *classes); | |
2513 | if (rc < 0) { | |
2514 | int i; | |
2515 | for (i = 0; i < *nclasses; i++) | |
2516 | kfree((*classes)[i]); | |
2517 | kfree(*classes); | |
2518 | } | |
2519 | ||
2520 | out: | |
0804d113 | 2521 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2522 | return rc; |
2523 | } | |
2524 | ||
2525 | static int get_permissions_callback(void *k, void *d, void *args) | |
2526 | { | |
2527 | struct perm_datum *datum = d; | |
2528 | char *name = k, **perms = args; | |
2529 | int value = datum->value - 1; | |
2530 | ||
2531 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2532 | if (!perms[value]) | |
2533 | return -ENOMEM; | |
2534 | ||
2535 | return 0; | |
2536 | } | |
2537 | ||
2538 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2539 | { | |
2540 | int rc = -ENOMEM, i; | |
2541 | struct class_datum *match; | |
2542 | ||
0804d113 | 2543 | read_lock(&policy_rwlock); |
55fcf09b CP |
2544 | |
2545 | match = hashtab_search(policydb.p_classes.table, class); | |
2546 | if (!match) { | |
744ba35e | 2547 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2548 | __func__, class); |
55fcf09b CP |
2549 | rc = -EINVAL; |
2550 | goto out; | |
2551 | } | |
2552 | ||
2553 | *nperms = match->permissions.nprim; | |
9f59f90b | 2554 | *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC); |
55fcf09b CP |
2555 | if (!*perms) |
2556 | goto out; | |
2557 | ||
2558 | if (match->comdatum) { | |
2559 | rc = hashtab_map(match->comdatum->permissions.table, | |
2560 | get_permissions_callback, *perms); | |
2561 | if (rc < 0) | |
2562 | goto err; | |
2563 | } | |
2564 | ||
2565 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2566 | *perms); | |
2567 | if (rc < 0) | |
2568 | goto err; | |
2569 | ||
2570 | out: | |
0804d113 | 2571 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2572 | return rc; |
2573 | ||
2574 | err: | |
0804d113 | 2575 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2576 | for (i = 0; i < *nperms; i++) |
2577 | kfree((*perms)[i]); | |
2578 | kfree(*perms); | |
2579 | return rc; | |
2580 | } | |
2581 | ||
3f12070e EP |
2582 | int security_get_reject_unknown(void) |
2583 | { | |
2584 | return policydb.reject_unknown; | |
2585 | } | |
2586 | ||
2587 | int security_get_allow_unknown(void) | |
2588 | { | |
2589 | return policydb.allow_unknown; | |
2590 | } | |
2591 | ||
3bb56b25 PM |
2592 | /** |
2593 | * security_policycap_supported - Check for a specific policy capability | |
2594 | * @req_cap: capability | |
2595 | * | |
2596 | * Description: | |
2597 | * This function queries the currently loaded policy to see if it supports the | |
2598 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2599 | * supported, false (0) if it isn't supported. | |
2600 | * | |
2601 | */ | |
2602 | int security_policycap_supported(unsigned int req_cap) | |
2603 | { | |
2604 | int rc; | |
2605 | ||
0804d113 | 2606 | read_lock(&policy_rwlock); |
3bb56b25 | 2607 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 2608 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
2609 | |
2610 | return rc; | |
2611 | } | |
2612 | ||
376bd9cb DG |
2613 | struct selinux_audit_rule { |
2614 | u32 au_seqno; | |
2615 | struct context au_ctxt; | |
2616 | }; | |
2617 | ||
9d57a7f9 | 2618 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 2619 | { |
9d57a7f9 AD |
2620 | struct selinux_audit_rule *rule = vrule; |
2621 | ||
376bd9cb DG |
2622 | if (rule) { |
2623 | context_destroy(&rule->au_ctxt); | |
2624 | kfree(rule); | |
2625 | } | |
2626 | } | |
2627 | ||
9d57a7f9 | 2628 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
2629 | { |
2630 | struct selinux_audit_rule *tmprule; | |
2631 | struct role_datum *roledatum; | |
2632 | struct type_datum *typedatum; | |
2633 | struct user_datum *userdatum; | |
9d57a7f9 | 2634 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
2635 | int rc = 0; |
2636 | ||
2637 | *rule = NULL; | |
2638 | ||
2639 | if (!ss_initialized) | |
3ad40d64 | 2640 | return -EOPNOTSUPP; |
376bd9cb DG |
2641 | |
2642 | switch (field) { | |
3a6b9f85 DG |
2643 | case AUDIT_SUBJ_USER: |
2644 | case AUDIT_SUBJ_ROLE: | |
2645 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2646 | case AUDIT_OBJ_USER: |
2647 | case AUDIT_OBJ_ROLE: | |
2648 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 2649 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 2650 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
2651 | return -EINVAL; |
2652 | break; | |
3a6b9f85 DG |
2653 | case AUDIT_SUBJ_SEN: |
2654 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2655 | case AUDIT_OBJ_LEV_LOW: |
2656 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2657 | /* we do not allow a range, indicated by the presense of '-' */ |
2658 | if (strchr(rulestr, '-')) | |
2659 | return -EINVAL; | |
2660 | break; | |
2661 | default: | |
2662 | /* only the above fields are valid */ | |
2663 | return -EINVAL; | |
2664 | } | |
2665 | ||
2666 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2667 | if (!tmprule) | |
2668 | return -ENOMEM; | |
2669 | ||
2670 | context_init(&tmprule->au_ctxt); | |
2671 | ||
0804d113 | 2672 | read_lock(&policy_rwlock); |
376bd9cb DG |
2673 | |
2674 | tmprule->au_seqno = latest_granting; | |
2675 | ||
2676 | switch (field) { | |
3a6b9f85 | 2677 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2678 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2679 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2680 | if (!userdatum) | |
2681 | rc = -EINVAL; | |
2682 | else | |
2683 | tmprule->au_ctxt.user = userdatum->value; | |
2684 | break; | |
3a6b9f85 | 2685 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2686 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2687 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2688 | if (!roledatum) | |
2689 | rc = -EINVAL; | |
2690 | else | |
2691 | tmprule->au_ctxt.role = roledatum->value; | |
2692 | break; | |
3a6b9f85 | 2693 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2694 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2695 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2696 | if (!typedatum) | |
2697 | rc = -EINVAL; | |
2698 | else | |
2699 | tmprule->au_ctxt.type = typedatum->value; | |
2700 | break; | |
3a6b9f85 DG |
2701 | case AUDIT_SUBJ_SEN: |
2702 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2703 | case AUDIT_OBJ_LEV_LOW: |
2704 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2705 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2706 | break; | |
2707 | } | |
2708 | ||
0804d113 | 2709 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2710 | |
2711 | if (rc) { | |
2712 | selinux_audit_rule_free(tmprule); | |
2713 | tmprule = NULL; | |
2714 | } | |
2715 | ||
2716 | *rule = tmprule; | |
2717 | ||
2718 | return rc; | |
2719 | } | |
2720 | ||
9d57a7f9 AD |
2721 | /* Check to see if the rule contains any selinux fields */ |
2722 | int selinux_audit_rule_known(struct audit_krule *rule) | |
2723 | { | |
2724 | int i; | |
2725 | ||
2726 | for (i = 0; i < rule->field_count; i++) { | |
2727 | struct audit_field *f = &rule->fields[i]; | |
2728 | switch (f->type) { | |
2729 | case AUDIT_SUBJ_USER: | |
2730 | case AUDIT_SUBJ_ROLE: | |
2731 | case AUDIT_SUBJ_TYPE: | |
2732 | case AUDIT_SUBJ_SEN: | |
2733 | case AUDIT_SUBJ_CLR: | |
2734 | case AUDIT_OBJ_USER: | |
2735 | case AUDIT_OBJ_ROLE: | |
2736 | case AUDIT_OBJ_TYPE: | |
2737 | case AUDIT_OBJ_LEV_LOW: | |
2738 | case AUDIT_OBJ_LEV_HIGH: | |
2739 | return 1; | |
2740 | } | |
2741 | } | |
2742 | ||
2743 | return 0; | |
2744 | } | |
2745 | ||
2746 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 2747 | struct audit_context *actx) |
376bd9cb DG |
2748 | { |
2749 | struct context *ctxt; | |
2750 | struct mls_level *level; | |
9d57a7f9 | 2751 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
2752 | int match = 0; |
2753 | ||
2754 | if (!rule) { | |
2755 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2756 | "selinux_audit_rule_match: missing rule\n"); |
376bd9cb DG |
2757 | return -ENOENT; |
2758 | } | |
2759 | ||
0804d113 | 2760 | read_lock(&policy_rwlock); |
376bd9cb DG |
2761 | |
2762 | if (rule->au_seqno < latest_granting) { | |
2763 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2764 | "selinux_audit_rule_match: stale rule\n"); |
376bd9cb DG |
2765 | match = -ESTALE; |
2766 | goto out; | |
2767 | } | |
2768 | ||
9a2f44f0 | 2769 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2770 | if (!ctxt) { |
2771 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 EP |
2772 | "selinux_audit_rule_match: unrecognized SID %d\n", |
2773 | sid); | |
376bd9cb DG |
2774 | match = -ENOENT; |
2775 | goto out; | |
2776 | } | |
2777 | ||
2778 | /* a field/op pair that is not caught here will simply fall through | |
2779 | without a match */ | |
2780 | switch (field) { | |
3a6b9f85 | 2781 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2782 | case AUDIT_OBJ_USER: |
376bd9cb | 2783 | switch (op) { |
5af75d8d | 2784 | case Audit_equal: |
376bd9cb DG |
2785 | match = (ctxt->user == rule->au_ctxt.user); |
2786 | break; | |
5af75d8d | 2787 | case Audit_not_equal: |
376bd9cb DG |
2788 | match = (ctxt->user != rule->au_ctxt.user); |
2789 | break; | |
2790 | } | |
2791 | break; | |
3a6b9f85 | 2792 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2793 | case AUDIT_OBJ_ROLE: |
376bd9cb | 2794 | switch (op) { |
5af75d8d | 2795 | case Audit_equal: |
376bd9cb DG |
2796 | match = (ctxt->role == rule->au_ctxt.role); |
2797 | break; | |
5af75d8d | 2798 | case Audit_not_equal: |
376bd9cb DG |
2799 | match = (ctxt->role != rule->au_ctxt.role); |
2800 | break; | |
2801 | } | |
2802 | break; | |
3a6b9f85 | 2803 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2804 | case AUDIT_OBJ_TYPE: |
376bd9cb | 2805 | switch (op) { |
5af75d8d | 2806 | case Audit_equal: |
376bd9cb DG |
2807 | match = (ctxt->type == rule->au_ctxt.type); |
2808 | break; | |
5af75d8d | 2809 | case Audit_not_equal: |
376bd9cb DG |
2810 | match = (ctxt->type != rule->au_ctxt.type); |
2811 | break; | |
2812 | } | |
2813 | break; | |
3a6b9f85 DG |
2814 | case AUDIT_SUBJ_SEN: |
2815 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2816 | case AUDIT_OBJ_LEV_LOW: |
2817 | case AUDIT_OBJ_LEV_HIGH: | |
2818 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
2819 | field == AUDIT_OBJ_LEV_LOW) ? |
2820 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 2821 | switch (op) { |
5af75d8d | 2822 | case Audit_equal: |
376bd9cb | 2823 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2824 | level); |
376bd9cb | 2825 | break; |
5af75d8d | 2826 | case Audit_not_equal: |
376bd9cb | 2827 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2828 | level); |
376bd9cb | 2829 | break; |
5af75d8d | 2830 | case Audit_lt: |
376bd9cb | 2831 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
2832 | level) && |
2833 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2834 | level)); | |
376bd9cb | 2835 | break; |
5af75d8d | 2836 | case Audit_le: |
376bd9cb | 2837 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 2838 | level); |
376bd9cb | 2839 | break; |
5af75d8d | 2840 | case Audit_gt: |
376bd9cb | 2841 | match = (mls_level_dom(level, |
5d55a345 EP |
2842 | &rule->au_ctxt.range.level[0]) && |
2843 | !mls_level_eq(level, | |
2844 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 2845 | break; |
5af75d8d | 2846 | case Audit_ge: |
376bd9cb | 2847 | match = mls_level_dom(level, |
5d55a345 | 2848 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
2849 | break; |
2850 | } | |
2851 | } | |
2852 | ||
2853 | out: | |
0804d113 | 2854 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2855 | return match; |
2856 | } | |
2857 | ||
9d57a7f9 | 2858 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb DG |
2859 | |
2860 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
f5269710 | 2861 | u16 class, u32 perms, u32 *retained) |
376bd9cb DG |
2862 | { |
2863 | int err = 0; | |
2864 | ||
2865 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2866 | err = aurule_callback(); | |
2867 | return err; | |
2868 | } | |
2869 | ||
2870 | static int __init aurule_init(void) | |
2871 | { | |
2872 | int err; | |
2873 | ||
2874 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
5d55a345 | 2875 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); |
376bd9cb DG |
2876 | if (err) |
2877 | panic("avc_add_callback() failed, error %d\n", err); | |
2878 | ||
2879 | return err; | |
2880 | } | |
2881 | __initcall(aurule_init); | |
2882 | ||
7420ed23 | 2883 | #ifdef CONFIG_NETLABEL |
7420ed23 | 2884 | /** |
5778eabd PM |
2885 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2886 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 2887 | * @sid: the SELinux SID |
7420ed23 VY |
2888 | * |
2889 | * Description: | |
2890 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2891 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2892 | * already been initialized. | |
7420ed23 VY |
2893 | * |
2894 | */ | |
5778eabd | 2895 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 2896 | u32 sid) |
7420ed23 | 2897 | { |
5dbe1eb0 | 2898 | u32 *sid_cache; |
7420ed23 | 2899 | |
5dbe1eb0 PM |
2900 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
2901 | if (sid_cache == NULL) | |
5778eabd | 2902 | return; |
5dbe1eb0 PM |
2903 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2904 | if (secattr->cache == NULL) { | |
2905 | kfree(sid_cache); | |
5778eabd | 2906 | return; |
0ec8abd7 | 2907 | } |
7420ed23 | 2908 | |
5dbe1eb0 PM |
2909 | *sid_cache = sid; |
2910 | secattr->cache->free = kfree; | |
2911 | secattr->cache->data = sid_cache; | |
5778eabd | 2912 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
2913 | } |
2914 | ||
2915 | /** | |
5778eabd | 2916 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 2917 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
2918 | * @sid: the SELinux SID |
2919 | * | |
2920 | * Description: | |
5778eabd | 2921 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2922 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5dbe1eb0 PM |
2923 | * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the |
2924 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to | |
2925 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
2926 | * conversion for future lookups. Returns zero on success, negative values on | |
2927 | * failure. | |
7420ed23 VY |
2928 | * |
2929 | */ | |
5778eabd | 2930 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 2931 | u32 *sid) |
7420ed23 VY |
2932 | { |
2933 | int rc = -EIDRM; | |
2934 | struct context *ctx; | |
2935 | struct context ctx_new; | |
5778eabd PM |
2936 | |
2937 | if (!ss_initialized) { | |
2938 | *sid = SECSID_NULL; | |
2939 | return 0; | |
2940 | } | |
7420ed23 | 2941 | |
0804d113 | 2942 | read_lock(&policy_rwlock); |
7420ed23 | 2943 | |
701a90ba | 2944 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
5dbe1eb0 PM |
2945 | *sid = *(u32 *)secattr->cache->data; |
2946 | rc = 0; | |
16efd454 PM |
2947 | } else if (secattr->flags & NETLBL_SECATTR_SECID) { |
2948 | *sid = secattr->attr.secid; | |
2949 | rc = 0; | |
701a90ba | 2950 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
5dbe1eb0 | 2951 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 VY |
2952 | if (ctx == NULL) |
2953 | goto netlbl_secattr_to_sid_return; | |
2954 | ||
81990fbd | 2955 | context_init(&ctx_new); |
7420ed23 VY |
2956 | ctx_new.user = ctx->user; |
2957 | ctx_new.role = ctx->role; | |
2958 | ctx_new.type = ctx->type; | |
02752760 | 2959 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 2960 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 | 2961 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
16efd454 | 2962 | secattr->attr.mls.cat) != 0) |
7420ed23 | 2963 | goto netlbl_secattr_to_sid_return; |
81990fbd PM |
2964 | memcpy(&ctx_new.range.level[1].cat, |
2965 | &ctx_new.range.level[0].cat, | |
2966 | sizeof(ctx_new.range.level[0].cat)); | |
7420ed23 VY |
2967 | } |
2968 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
2969 | goto netlbl_secattr_to_sid_return_cleanup; | |
2970 | ||
2971 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
2972 | if (rc != 0) | |
2973 | goto netlbl_secattr_to_sid_return_cleanup; | |
2974 | ||
5dbe1eb0 | 2975 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 2976 | |
7420ed23 VY |
2977 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
2978 | } else { | |
388b2405 | 2979 | *sid = SECSID_NULL; |
7420ed23 VY |
2980 | rc = 0; |
2981 | } | |
2982 | ||
2983 | netlbl_secattr_to_sid_return: | |
0804d113 | 2984 | read_unlock(&policy_rwlock); |
7420ed23 VY |
2985 | return rc; |
2986 | netlbl_secattr_to_sid_return_cleanup: | |
2987 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
2988 | goto netlbl_secattr_to_sid_return; | |
2989 | } | |
2990 | ||
2991 | /** | |
5778eabd PM |
2992 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
2993 | * @sid: the SELinux SID | |
2994 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
2995 | * |
2996 | * Description: | |
5778eabd PM |
2997 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
2998 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
2999 | * |
3000 | */ | |
5778eabd | 3001 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 3002 | { |
99d854d2 | 3003 | int rc; |
7420ed23 VY |
3004 | struct context *ctx; |
3005 | ||
3006 | if (!ss_initialized) | |
3007 | return 0; | |
3008 | ||
0804d113 | 3009 | read_lock(&policy_rwlock); |
7420ed23 | 3010 | ctx = sidtab_search(&sidtab, sid); |
99d854d2 PM |
3011 | if (ctx == NULL) { |
3012 | rc = -ENOENT; | |
5778eabd | 3013 | goto netlbl_sid_to_secattr_failure; |
99d854d2 | 3014 | } |
5778eabd PM |
3015 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], |
3016 | GFP_ATOMIC); | |
99d854d2 PM |
3017 | if (secattr->domain == NULL) { |
3018 | rc = -ENOMEM; | |
3019 | goto netlbl_sid_to_secattr_failure; | |
3020 | } | |
8d75899d PM |
3021 | secattr->attr.secid = sid; |
3022 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
3023 | mls_export_netlbl_lvl(ctx, secattr); |
3024 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 3025 | if (rc != 0) |
5778eabd | 3026 | goto netlbl_sid_to_secattr_failure; |
0804d113 | 3027 | read_unlock(&policy_rwlock); |
99f59ed0 | 3028 | |
5778eabd | 3029 | return 0; |
f8687afe | 3030 | |
5778eabd | 3031 | netlbl_sid_to_secattr_failure: |
0804d113 | 3032 | read_unlock(&policy_rwlock); |
f8687afe PM |
3033 | return rc; |
3034 | } | |
7420ed23 | 3035 | #endif /* CONFIG_NETLABEL */ |