Commit | Line | Data |
---|---|---|
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 | ||
d9250dea KK |
90 | static int context_struct_compute_av(struct context *scontext, |
91 | struct context *tcontext, | |
92 | u16 tclass, | |
93 | u32 requested, | |
94 | struct av_decision *avd); | |
c6d3aaa4 SS |
95 | |
96 | struct selinux_mapping { | |
97 | u16 value; /* policy value */ | |
98 | unsigned num_perms; | |
99 | u32 perms[sizeof(u32) * 8]; | |
100 | }; | |
101 | ||
102 | static struct selinux_mapping *current_mapping; | |
103 | static u16 current_mapping_size; | |
104 | ||
105 | static int selinux_set_mapping(struct policydb *pol, | |
106 | struct security_class_mapping *map, | |
107 | struct selinux_mapping **out_map_p, | |
108 | u16 *out_map_size) | |
109 | { | |
110 | struct selinux_mapping *out_map = NULL; | |
111 | size_t size = sizeof(struct selinux_mapping); | |
112 | u16 i, j; | |
113 | unsigned k; | |
114 | bool print_unknown_handle = false; | |
115 | ||
116 | /* Find number of classes in the input mapping */ | |
117 | if (!map) | |
118 | return -EINVAL; | |
119 | i = 0; | |
120 | while (map[i].name) | |
121 | i++; | |
122 | ||
123 | /* Allocate space for the class records, plus one for class zero */ | |
124 | out_map = kcalloc(++i, size, GFP_ATOMIC); | |
125 | if (!out_map) | |
126 | return -ENOMEM; | |
127 | ||
128 | /* Store the raw class and permission values */ | |
129 | j = 0; | |
130 | while (map[j].name) { | |
131 | struct security_class_mapping *p_in = map + (j++); | |
132 | struct selinux_mapping *p_out = out_map + j; | |
133 | ||
134 | /* An empty class string skips ahead */ | |
135 | if (!strcmp(p_in->name, "")) { | |
136 | p_out->num_perms = 0; | |
137 | continue; | |
138 | } | |
139 | ||
140 | p_out->value = string_to_security_class(pol, p_in->name); | |
141 | if (!p_out->value) { | |
142 | printk(KERN_INFO | |
143 | "SELinux: Class %s not defined in policy.\n", | |
144 | p_in->name); | |
145 | if (pol->reject_unknown) | |
146 | goto err; | |
147 | p_out->num_perms = 0; | |
148 | print_unknown_handle = true; | |
149 | continue; | |
150 | } | |
151 | ||
152 | k = 0; | |
153 | while (p_in->perms && p_in->perms[k]) { | |
154 | /* An empty permission string skips ahead */ | |
155 | if (!*p_in->perms[k]) { | |
156 | k++; | |
157 | continue; | |
158 | } | |
159 | p_out->perms[k] = string_to_av_perm(pol, p_out->value, | |
160 | p_in->perms[k]); | |
161 | if (!p_out->perms[k]) { | |
162 | printk(KERN_INFO | |
163 | "SELinux: Permission %s in class %s not defined in policy.\n", | |
164 | p_in->perms[k], p_in->name); | |
165 | if (pol->reject_unknown) | |
166 | goto err; | |
167 | print_unknown_handle = true; | |
168 | } | |
169 | ||
170 | k++; | |
171 | } | |
172 | p_out->num_perms = k; | |
173 | } | |
174 | ||
175 | if (print_unknown_handle) | |
176 | printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n", | |
177 | pol->allow_unknown ? "allowed" : "denied"); | |
178 | ||
179 | *out_map_p = out_map; | |
180 | *out_map_size = i; | |
181 | return 0; | |
182 | err: | |
183 | kfree(out_map); | |
184 | return -EINVAL; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Get real, policy values from mapped values | |
189 | */ | |
190 | ||
191 | static u16 unmap_class(u16 tclass) | |
192 | { | |
193 | if (tclass < current_mapping_size) | |
194 | return current_mapping[tclass].value; | |
195 | ||
196 | return tclass; | |
197 | } | |
198 | ||
199 | static u32 unmap_perm(u16 tclass, u32 tperm) | |
200 | { | |
201 | if (tclass < current_mapping_size) { | |
202 | unsigned i; | |
203 | u32 kperm = 0; | |
204 | ||
205 | for (i = 0; i < current_mapping[tclass].num_perms; i++) | |
206 | if (tperm & (1<<i)) { | |
207 | kperm |= current_mapping[tclass].perms[i]; | |
208 | tperm &= ~(1<<i); | |
209 | } | |
210 | return kperm; | |
211 | } | |
212 | ||
213 | return tperm; | |
214 | } | |
215 | ||
216 | static void map_decision(u16 tclass, struct av_decision *avd, | |
217 | int allow_unknown) | |
218 | { | |
219 | if (tclass < current_mapping_size) { | |
220 | unsigned i, n = current_mapping[tclass].num_perms; | |
221 | u32 result; | |
222 | ||
223 | for (i = 0, result = 0; i < n; i++) { | |
224 | if (avd->allowed & current_mapping[tclass].perms[i]) | |
225 | result |= 1<<i; | |
226 | if (allow_unknown && !current_mapping[tclass].perms[i]) | |
227 | result |= 1<<i; | |
228 | } | |
229 | avd->allowed = result; | |
230 | ||
231 | for (i = 0, result = 0; i < n; i++) | |
232 | if (avd->auditallow & current_mapping[tclass].perms[i]) | |
233 | result |= 1<<i; | |
234 | avd->auditallow = result; | |
235 | ||
236 | for (i = 0, result = 0; i < n; i++) { | |
237 | if (avd->auditdeny & current_mapping[tclass].perms[i]) | |
238 | result |= 1<<i; | |
239 | if (!allow_unknown && !current_mapping[tclass].perms[i]) | |
240 | result |= 1<<i; | |
241 | } | |
242 | avd->auditdeny = result; | |
243 | } | |
244 | } | |
245 | ||
246 | ||
1da177e4 LT |
247 | /* |
248 | * Return the boolean value of a constraint expression | |
249 | * when it is applied to the specified source and target | |
250 | * security contexts. | |
251 | * | |
252 | * xcontext is a special beast... It is used by the validatetrans rules | |
253 | * only. For these rules, scontext is the context before the transition, | |
254 | * tcontext is the context after the transition, and xcontext is the context | |
255 | * of the process performing the transition. All other callers of | |
256 | * constraint_expr_eval should pass in NULL for xcontext. | |
257 | */ | |
258 | static int constraint_expr_eval(struct context *scontext, | |
259 | struct context *tcontext, | |
260 | struct context *xcontext, | |
261 | struct constraint_expr *cexpr) | |
262 | { | |
263 | u32 val1, val2; | |
264 | struct context *c; | |
265 | struct role_datum *r1, *r2; | |
266 | struct mls_level *l1, *l2; | |
267 | struct constraint_expr *e; | |
268 | int s[CEXPR_MAXDEPTH]; | |
269 | int sp = -1; | |
270 | ||
271 | for (e = cexpr; e; e = e->next) { | |
272 | switch (e->expr_type) { | |
273 | case CEXPR_NOT: | |
274 | BUG_ON(sp < 0); | |
275 | s[sp] = !s[sp]; | |
276 | break; | |
277 | case CEXPR_AND: | |
278 | BUG_ON(sp < 1); | |
279 | sp--; | |
280 | s[sp] &= s[sp+1]; | |
281 | break; | |
282 | case CEXPR_OR: | |
283 | BUG_ON(sp < 1); | |
284 | sp--; | |
285 | s[sp] |= s[sp+1]; | |
286 | break; | |
287 | case CEXPR_ATTR: | |
288 | if (sp == (CEXPR_MAXDEPTH-1)) | |
289 | return 0; | |
290 | switch (e->attr) { | |
291 | case CEXPR_USER: | |
292 | val1 = scontext->user; | |
293 | val2 = tcontext->user; | |
294 | break; | |
295 | case CEXPR_TYPE: | |
296 | val1 = scontext->type; | |
297 | val2 = tcontext->type; | |
298 | break; | |
299 | case CEXPR_ROLE: | |
300 | val1 = scontext->role; | |
301 | val2 = tcontext->role; | |
302 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
303 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
304 | switch (e->op) { | |
305 | case CEXPR_DOM: | |
306 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
307 | val2 - 1); | |
308 | continue; | |
309 | case CEXPR_DOMBY: | |
310 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
311 | val1 - 1); | |
312 | continue; | |
313 | case CEXPR_INCOMP: | |
5d55a345 EP |
314 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
315 | val2 - 1) && | |
316 | !ebitmap_get_bit(&r2->dominates, | |
317 | val1 - 1)); | |
1da177e4 LT |
318 | continue; |
319 | default: | |
320 | break; | |
321 | } | |
322 | break; | |
323 | case CEXPR_L1L2: | |
324 | l1 = &(scontext->range.level[0]); | |
325 | l2 = &(tcontext->range.level[0]); | |
326 | goto mls_ops; | |
327 | case CEXPR_L1H2: | |
328 | l1 = &(scontext->range.level[0]); | |
329 | l2 = &(tcontext->range.level[1]); | |
330 | goto mls_ops; | |
331 | case CEXPR_H1L2: | |
332 | l1 = &(scontext->range.level[1]); | |
333 | l2 = &(tcontext->range.level[0]); | |
334 | goto mls_ops; | |
335 | case CEXPR_H1H2: | |
336 | l1 = &(scontext->range.level[1]); | |
337 | l2 = &(tcontext->range.level[1]); | |
338 | goto mls_ops; | |
339 | case CEXPR_L1H1: | |
340 | l1 = &(scontext->range.level[0]); | |
341 | l2 = &(scontext->range.level[1]); | |
342 | goto mls_ops; | |
343 | case CEXPR_L2H2: | |
344 | l1 = &(tcontext->range.level[0]); | |
345 | l2 = &(tcontext->range.level[1]); | |
346 | goto mls_ops; | |
347 | mls_ops: | |
348 | switch (e->op) { | |
349 | case CEXPR_EQ: | |
350 | s[++sp] = mls_level_eq(l1, l2); | |
351 | continue; | |
352 | case CEXPR_NEQ: | |
353 | s[++sp] = !mls_level_eq(l1, l2); | |
354 | continue; | |
355 | case CEXPR_DOM: | |
356 | s[++sp] = mls_level_dom(l1, l2); | |
357 | continue; | |
358 | case CEXPR_DOMBY: | |
359 | s[++sp] = mls_level_dom(l2, l1); | |
360 | continue; | |
361 | case CEXPR_INCOMP: | |
362 | s[++sp] = mls_level_incomp(l2, l1); | |
363 | continue; | |
364 | default: | |
365 | BUG(); | |
366 | return 0; | |
367 | } | |
368 | break; | |
369 | default: | |
370 | BUG(); | |
371 | return 0; | |
372 | } | |
373 | ||
374 | switch (e->op) { | |
375 | case CEXPR_EQ: | |
376 | s[++sp] = (val1 == val2); | |
377 | break; | |
378 | case CEXPR_NEQ: | |
379 | s[++sp] = (val1 != val2); | |
380 | break; | |
381 | default: | |
382 | BUG(); | |
383 | return 0; | |
384 | } | |
385 | break; | |
386 | case CEXPR_NAMES: | |
387 | if (sp == (CEXPR_MAXDEPTH-1)) | |
388 | return 0; | |
389 | c = scontext; | |
390 | if (e->attr & CEXPR_TARGET) | |
391 | c = tcontext; | |
392 | else if (e->attr & CEXPR_XTARGET) { | |
393 | c = xcontext; | |
394 | if (!c) { | |
395 | BUG(); | |
396 | return 0; | |
397 | } | |
398 | } | |
399 | if (e->attr & CEXPR_USER) | |
400 | val1 = c->user; | |
401 | else if (e->attr & CEXPR_ROLE) | |
402 | val1 = c->role; | |
403 | else if (e->attr & CEXPR_TYPE) | |
404 | val1 = c->type; | |
405 | else { | |
406 | BUG(); | |
407 | return 0; | |
408 | } | |
409 | ||
410 | switch (e->op) { | |
411 | case CEXPR_EQ: | |
412 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
413 | break; | |
414 | case CEXPR_NEQ: | |
415 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
416 | break; | |
417 | default: | |
418 | BUG(); | |
419 | return 0; | |
420 | } | |
421 | break; | |
422 | default: | |
423 | BUG(); | |
424 | return 0; | |
425 | } | |
426 | } | |
427 | ||
428 | BUG_ON(sp != 0); | |
429 | return s[0]; | |
430 | } | |
431 | ||
44c2d9bd KK |
432 | /* |
433 | * security_dump_masked_av - dumps masked permissions during | |
434 | * security_compute_av due to RBAC, MLS/Constraint and Type bounds. | |
435 | */ | |
436 | static int dump_masked_av_helper(void *k, void *d, void *args) | |
437 | { | |
438 | struct perm_datum *pdatum = d; | |
439 | char **permission_names = args; | |
440 | ||
441 | BUG_ON(pdatum->value < 1 || pdatum->value > 32); | |
442 | ||
443 | permission_names[pdatum->value - 1] = (char *)k; | |
444 | ||
445 | return 0; | |
446 | } | |
447 | ||
448 | static void security_dump_masked_av(struct context *scontext, | |
449 | struct context *tcontext, | |
450 | u16 tclass, | |
451 | u32 permissions, | |
452 | const char *reason) | |
453 | { | |
454 | struct common_datum *common_dat; | |
455 | struct class_datum *tclass_dat; | |
456 | struct audit_buffer *ab; | |
457 | char *tclass_name; | |
458 | char *scontext_name = NULL; | |
459 | char *tcontext_name = NULL; | |
460 | char *permission_names[32]; | |
461 | int index, length; | |
462 | bool need_comma = false; | |
463 | ||
464 | if (!permissions) | |
465 | return; | |
466 | ||
467 | tclass_name = policydb.p_class_val_to_name[tclass - 1]; | |
468 | tclass_dat = policydb.class_val_to_struct[tclass - 1]; | |
469 | common_dat = tclass_dat->comdatum; | |
470 | ||
471 | /* init permission_names */ | |
472 | if (common_dat && | |
473 | hashtab_map(common_dat->permissions.table, | |
474 | dump_masked_av_helper, permission_names) < 0) | |
475 | goto out; | |
476 | ||
477 | if (hashtab_map(tclass_dat->permissions.table, | |
478 | dump_masked_av_helper, permission_names) < 0) | |
479 | goto out; | |
480 | ||
481 | /* get scontext/tcontext in text form */ | |
482 | if (context_struct_to_string(scontext, | |
483 | &scontext_name, &length) < 0) | |
484 | goto out; | |
485 | ||
486 | if (context_struct_to_string(tcontext, | |
487 | &tcontext_name, &length) < 0) | |
488 | goto out; | |
489 | ||
490 | /* audit a message */ | |
491 | ab = audit_log_start(current->audit_context, | |
492 | GFP_ATOMIC, AUDIT_SELINUX_ERR); | |
493 | if (!ab) | |
494 | goto out; | |
495 | ||
496 | audit_log_format(ab, "op=security_compute_av reason=%s " | |
497 | "scontext=%s tcontext=%s tclass=%s perms=", | |
498 | reason, scontext_name, tcontext_name, tclass_name); | |
499 | ||
500 | for (index = 0; index < 32; index++) { | |
501 | u32 mask = (1 << index); | |
502 | ||
503 | if ((mask & permissions) == 0) | |
504 | continue; | |
505 | ||
506 | audit_log_format(ab, "%s%s", | |
507 | need_comma ? "," : "", | |
508 | permission_names[index] | |
509 | ? permission_names[index] : "????"); | |
510 | need_comma = true; | |
511 | } | |
512 | audit_log_end(ab); | |
513 | out: | |
514 | /* release scontext/tcontext */ | |
515 | kfree(tcontext_name); | |
516 | kfree(scontext_name); | |
517 | ||
518 | return; | |
519 | } | |
520 | ||
d9250dea KK |
521 | /* |
522 | * security_boundary_permission - drops violated permissions | |
523 | * on boundary constraint. | |
524 | */ | |
525 | static void type_attribute_bounds_av(struct context *scontext, | |
526 | struct context *tcontext, | |
527 | u16 tclass, | |
528 | u32 requested, | |
529 | struct av_decision *avd) | |
530 | { | |
531 | struct context lo_scontext; | |
532 | struct context lo_tcontext; | |
533 | struct av_decision lo_avd; | |
534 | struct type_datum *source | |
535 | = policydb.type_val_to_struct[scontext->type - 1]; | |
536 | struct type_datum *target | |
537 | = policydb.type_val_to_struct[tcontext->type - 1]; | |
538 | u32 masked = 0; | |
539 | ||
540 | if (source->bounds) { | |
541 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
542 | ||
543 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); | |
544 | lo_scontext.type = source->bounds; | |
545 | ||
546 | context_struct_compute_av(&lo_scontext, | |
547 | tcontext, | |
548 | tclass, | |
549 | requested, | |
550 | &lo_avd); | |
551 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
552 | return; /* no masked permission */ | |
553 | masked = ~lo_avd.allowed & avd->allowed; | |
554 | } | |
555 | ||
556 | if (target->bounds) { | |
557 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
558 | ||
559 | memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); | |
560 | lo_tcontext.type = target->bounds; | |
561 | ||
562 | context_struct_compute_av(scontext, | |
563 | &lo_tcontext, | |
564 | tclass, | |
565 | requested, | |
566 | &lo_avd); | |
567 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
568 | return; /* no masked permission */ | |
569 | masked = ~lo_avd.allowed & avd->allowed; | |
570 | } | |
571 | ||
572 | if (source->bounds && target->bounds) { | |
573 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
574 | /* | |
575 | * lo_scontext and lo_tcontext are already | |
576 | * set up. | |
577 | */ | |
578 | ||
579 | context_struct_compute_av(&lo_scontext, | |
580 | &lo_tcontext, | |
581 | tclass, | |
582 | requested, | |
583 | &lo_avd); | |
584 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
585 | return; /* no masked permission */ | |
586 | masked = ~lo_avd.allowed & avd->allowed; | |
587 | } | |
588 | ||
589 | if (masked) { | |
d9250dea KK |
590 | /* mask violated permissions */ |
591 | avd->allowed &= ~masked; | |
592 | ||
44c2d9bd KK |
593 | /* audit masked permissions */ |
594 | security_dump_masked_av(scontext, tcontext, | |
595 | tclass, masked, "bounds"); | |
d9250dea KK |
596 | } |
597 | } | |
598 | ||
1da177e4 LT |
599 | /* |
600 | * Compute access vectors based on a context structure pair for | |
601 | * the permissions in a particular class. | |
602 | */ | |
603 | static int context_struct_compute_av(struct context *scontext, | |
604 | struct context *tcontext, | |
605 | u16 tclass, | |
606 | u32 requested, | |
607 | struct av_decision *avd) | |
608 | { | |
609 | struct constraint_node *constraint; | |
610 | struct role_allow *ra; | |
611 | struct avtab_key avkey; | |
782ebb99 | 612 | struct avtab_node *node; |
1da177e4 | 613 | struct class_datum *tclass_datum; |
782ebb99 SS |
614 | struct ebitmap *sattr, *tattr; |
615 | struct ebitmap_node *snode, *tnode; | |
616 | unsigned int i, j; | |
1da177e4 | 617 | |
1da177e4 LT |
618 | /* |
619 | * Initialize the access vectors to the default values. | |
620 | */ | |
621 | avd->allowed = 0; | |
1da177e4 LT |
622 | avd->auditallow = 0; |
623 | avd->auditdeny = 0xffffffff; | |
624 | avd->seqno = latest_granting; | |
8a6f83af | 625 | avd->flags = 0; |
1da177e4 | 626 | |
c6d3aaa4 SS |
627 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { |
628 | if (printk_ratelimit()) | |
629 | printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass); | |
630 | return -EINVAL; | |
631 | } | |
3f12070e EP |
632 | |
633 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
634 | ||
1da177e4 LT |
635 | /* |
636 | * If a specific type enforcement rule was defined for | |
637 | * this permission check, then use it. | |
638 | */ | |
1da177e4 | 639 | avkey.target_class = tclass; |
782ebb99 SS |
640 | avkey.specified = AVTAB_AV; |
641 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
642 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
9fe79ad1 KK |
643 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
644 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
645 | avkey.source_type = i + 1; |
646 | avkey.target_type = j + 1; | |
647 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
dbc74c65 | 648 | node; |
782ebb99 SS |
649 | node = avtab_search_node_next(node, avkey.specified)) { |
650 | if (node->key.specified == AVTAB_ALLOWED) | |
651 | avd->allowed |= node->datum.data; | |
652 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
653 | avd->auditallow |= node->datum.data; | |
654 | else if (node->key.specified == AVTAB_AUDITDENY) | |
655 | avd->auditdeny &= node->datum.data; | |
656 | } | |
1da177e4 | 657 | |
782ebb99 SS |
658 | /* Check conditional av table for additional permissions */ |
659 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
660 | ||
661 | } | |
662 | } | |
1da177e4 LT |
663 | |
664 | /* | |
665 | * Remove any permissions prohibited by a constraint (this includes | |
666 | * the MLS policy). | |
667 | */ | |
668 | constraint = tclass_datum->constraints; | |
669 | while (constraint) { | |
670 | if ((constraint->permissions & (avd->allowed)) && | |
671 | !constraint_expr_eval(scontext, tcontext, NULL, | |
672 | constraint->expr)) { | |
caabbdc0 | 673 | avd->allowed &= ~(constraint->permissions); |
1da177e4 LT |
674 | } |
675 | constraint = constraint->next; | |
676 | } | |
677 | ||
678 | /* | |
679 | * If checking process transition permission and the | |
680 | * role is changing, then check the (current_role, new_role) | |
681 | * pair. | |
682 | */ | |
c6d3aaa4 SS |
683 | if (tclass == policydb.process_class && |
684 | (avd->allowed & policydb.process_trans_perms) && | |
1da177e4 LT |
685 | scontext->role != tcontext->role) { |
686 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
687 | if (scontext->role == ra->role && | |
688 | tcontext->role == ra->new_role) | |
689 | break; | |
690 | } | |
691 | if (!ra) | |
c6d3aaa4 | 692 | avd->allowed &= ~policydb.process_trans_perms; |
1da177e4 LT |
693 | } |
694 | ||
d9250dea KK |
695 | /* |
696 | * If the given source and target types have boundary | |
697 | * constraint, lazy checks have to mask any violated | |
698 | * permission and notice it to userspace via audit. | |
699 | */ | |
700 | type_attribute_bounds_av(scontext, tcontext, | |
701 | tclass, requested, avd); | |
702 | ||
1da177e4 LT |
703 | return 0; |
704 | } | |
705 | ||
706 | static int security_validtrans_handle_fail(struct context *ocontext, | |
5d55a345 EP |
707 | struct context *ncontext, |
708 | struct context *tcontext, | |
709 | u16 tclass) | |
1da177e4 LT |
710 | { |
711 | char *o = NULL, *n = NULL, *t = NULL; | |
712 | u32 olen, nlen, tlen; | |
713 | ||
714 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
715 | goto out; | |
716 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
717 | goto out; | |
718 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
719 | goto out; | |
9ad9ad38 | 720 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
5d55a345 EP |
721 | "security_validate_transition: denied for" |
722 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
723 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
1da177e4 LT |
724 | out: |
725 | kfree(o); | |
726 | kfree(n); | |
727 | kfree(t); | |
728 | ||
729 | if (!selinux_enforcing) | |
730 | return 0; | |
731 | return -EPERM; | |
732 | } | |
733 | ||
734 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
c6d3aaa4 | 735 | u16 orig_tclass) |
1da177e4 LT |
736 | { |
737 | struct context *ocontext; | |
738 | struct context *ncontext; | |
739 | struct context *tcontext; | |
740 | struct class_datum *tclass_datum; | |
741 | struct constraint_node *constraint; | |
c6d3aaa4 | 742 | u16 tclass; |
1da177e4 LT |
743 | int rc = 0; |
744 | ||
745 | if (!ss_initialized) | |
746 | return 0; | |
747 | ||
0804d113 | 748 | read_lock(&policy_rwlock); |
1da177e4 | 749 | |
c6d3aaa4 SS |
750 | tclass = unmap_class(orig_tclass); |
751 | ||
1da177e4 | 752 | if (!tclass || tclass > policydb.p_classes.nprim) { |
744ba35e EP |
753 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", |
754 | __func__, tclass); | |
1da177e4 LT |
755 | rc = -EINVAL; |
756 | goto out; | |
757 | } | |
758 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
759 | ||
760 | ocontext = sidtab_search(&sidtab, oldsid); | |
761 | if (!ocontext) { | |
744ba35e EP |
762 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
763 | __func__, oldsid); | |
1da177e4 LT |
764 | rc = -EINVAL; |
765 | goto out; | |
766 | } | |
767 | ||
768 | ncontext = sidtab_search(&sidtab, newsid); | |
769 | if (!ncontext) { | |
744ba35e EP |
770 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
771 | __func__, newsid); | |
1da177e4 LT |
772 | rc = -EINVAL; |
773 | goto out; | |
774 | } | |
775 | ||
776 | tcontext = sidtab_search(&sidtab, tasksid); | |
777 | if (!tcontext) { | |
744ba35e EP |
778 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
779 | __func__, tasksid); | |
1da177e4 LT |
780 | rc = -EINVAL; |
781 | goto out; | |
782 | } | |
783 | ||
784 | constraint = tclass_datum->validatetrans; | |
785 | while (constraint) { | |
786 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 787 | constraint->expr)) { |
1da177e4 | 788 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
5d55a345 | 789 | tcontext, tclass); |
1da177e4 LT |
790 | goto out; |
791 | } | |
792 | constraint = constraint->next; | |
793 | } | |
794 | ||
795 | out: | |
0804d113 | 796 | read_unlock(&policy_rwlock); |
1da177e4 LT |
797 | return rc; |
798 | } | |
799 | ||
d9250dea KK |
800 | /* |
801 | * security_bounded_transition - check whether the given | |
802 | * transition is directed to bounded, or not. | |
803 | * It returns 0, if @newsid is bounded by @oldsid. | |
804 | * Otherwise, it returns error code. | |
805 | * | |
806 | * @oldsid : current security identifier | |
807 | * @newsid : destinated security identifier | |
808 | */ | |
809 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
810 | { | |
811 | struct context *old_context, *new_context; | |
812 | struct type_datum *type; | |
813 | int index; | |
814 | int rc = -EINVAL; | |
815 | ||
816 | read_lock(&policy_rwlock); | |
817 | ||
818 | old_context = sidtab_search(&sidtab, old_sid); | |
819 | if (!old_context) { | |
820 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
821 | __func__, old_sid); | |
822 | goto out; | |
823 | } | |
824 | ||
825 | new_context = sidtab_search(&sidtab, new_sid); | |
826 | if (!new_context) { | |
827 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
828 | __func__, new_sid); | |
829 | goto out; | |
830 | } | |
831 | ||
832 | /* type/domain unchaned */ | |
833 | if (old_context->type == new_context->type) { | |
834 | rc = 0; | |
835 | goto out; | |
836 | } | |
837 | ||
838 | index = new_context->type; | |
839 | while (true) { | |
840 | type = policydb.type_val_to_struct[index - 1]; | |
841 | BUG_ON(!type); | |
842 | ||
843 | /* not bounded anymore */ | |
844 | if (!type->bounds) { | |
845 | rc = -EPERM; | |
846 | break; | |
847 | } | |
848 | ||
849 | /* @newsid is bounded by @oldsid */ | |
850 | if (type->bounds == old_context->type) { | |
851 | rc = 0; | |
852 | break; | |
853 | } | |
854 | index = type->bounds; | |
855 | } | |
44c2d9bd KK |
856 | |
857 | if (rc) { | |
858 | char *old_name = NULL; | |
859 | char *new_name = NULL; | |
860 | int length; | |
861 | ||
862 | if (!context_struct_to_string(old_context, | |
863 | &old_name, &length) && | |
864 | !context_struct_to_string(new_context, | |
865 | &new_name, &length)) { | |
866 | audit_log(current->audit_context, | |
867 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
868 | "op=security_bounded_transition " | |
869 | "result=denied " | |
870 | "oldcontext=%s newcontext=%s", | |
871 | old_name, new_name); | |
872 | } | |
873 | kfree(new_name); | |
874 | kfree(old_name); | |
875 | } | |
d9250dea KK |
876 | out: |
877 | read_unlock(&policy_rwlock); | |
878 | ||
879 | return rc; | |
880 | } | |
881 | ||
882 | ||
c6d3aaa4 SS |
883 | static int security_compute_av_core(u32 ssid, |
884 | u32 tsid, | |
885 | u16 tclass, | |
886 | u32 requested, | |
887 | struct av_decision *avd) | |
888 | { | |
889 | struct context *scontext = NULL, *tcontext = NULL; | |
890 | int rc = 0; | |
891 | ||
892 | scontext = sidtab_search(&sidtab, ssid); | |
893 | if (!scontext) { | |
894 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
895 | __func__, ssid); | |
896 | return -EINVAL; | |
897 | } | |
898 | tcontext = sidtab_search(&sidtab, tsid); | |
899 | if (!tcontext) { | |
900 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
901 | __func__, tsid); | |
902 | return -EINVAL; | |
903 | } | |
904 | ||
905 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
906 | requested, avd); | |
907 | ||
908 | /* permissive domain? */ | |
909 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
910 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
911 | ||
912 | return rc; | |
913 | } | |
914 | ||
1da177e4 LT |
915 | /** |
916 | * security_compute_av - Compute access vector decisions. | |
917 | * @ssid: source security identifier | |
918 | * @tsid: target security identifier | |
919 | * @tclass: target security class | |
920 | * @requested: requested permissions | |
921 | * @avd: access vector decisions | |
922 | * | |
923 | * Compute a set of access vector decisions based on the | |
924 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
925 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
926 | * if the access vector decisions were computed successfully. | |
927 | */ | |
928 | int security_compute_av(u32 ssid, | |
929 | u32 tsid, | |
c6d3aaa4 SS |
930 | u16 orig_tclass, |
931 | u32 orig_requested, | |
1da177e4 LT |
932 | struct av_decision *avd) |
933 | { | |
c6d3aaa4 SS |
934 | u16 tclass; |
935 | u32 requested; | |
936 | int rc; | |
937 | ||
b7f3008a SS |
938 | read_lock(&policy_rwlock); |
939 | ||
c6d3aaa4 SS |
940 | if (!ss_initialized) |
941 | goto allow; | |
942 | ||
c6d3aaa4 SS |
943 | requested = unmap_perm(orig_tclass, orig_requested); |
944 | tclass = unmap_class(orig_tclass); | |
945 | if (unlikely(orig_tclass && !tclass)) { | |
946 | if (policydb.allow_unknown) | |
947 | goto allow; | |
b7f3008a SS |
948 | rc = -EINVAL; |
949 | goto out; | |
c6d3aaa4 SS |
950 | } |
951 | rc = security_compute_av_core(ssid, tsid, tclass, requested, avd); | |
952 | map_decision(orig_tclass, avd, policydb.allow_unknown); | |
b7f3008a | 953 | out: |
c6d3aaa4 SS |
954 | read_unlock(&policy_rwlock); |
955 | return rc; | |
956 | allow: | |
957 | avd->allowed = 0xffffffff; | |
958 | avd->auditallow = 0; | |
959 | avd->auditdeny = 0xffffffff; | |
960 | avd->seqno = latest_granting; | |
961 | avd->flags = 0; | |
b7f3008a SS |
962 | rc = 0; |
963 | goto out; | |
c6d3aaa4 SS |
964 | } |
965 | ||
966 | int security_compute_av_user(u32 ssid, | |
967 | u32 tsid, | |
968 | u16 tclass, | |
969 | u32 requested, | |
970 | struct av_decision *avd) | |
971 | { | |
972 | int rc; | |
1da177e4 LT |
973 | |
974 | if (!ss_initialized) { | |
4c443d1b | 975 | avd->allowed = 0xffffffff; |
1da177e4 LT |
976 | avd->auditallow = 0; |
977 | avd->auditdeny = 0xffffffff; | |
978 | avd->seqno = latest_granting; | |
979 | return 0; | |
980 | } | |
981 | ||
0804d113 | 982 | read_lock(&policy_rwlock); |
c6d3aaa4 | 983 | rc = security_compute_av_core(ssid, tsid, tclass, requested, avd); |
0804d113 | 984 | read_unlock(&policy_rwlock); |
1da177e4 LT |
985 | return rc; |
986 | } | |
987 | ||
988 | /* | |
989 | * Write the security context string representation of | |
990 | * the context structure `context' into a dynamically | |
991 | * allocated string of the correct size. Set `*scontext' | |
992 | * to point to this string and set `*scontext_len' to | |
993 | * the length of the string. | |
994 | */ | |
995 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
996 | { | |
997 | char *scontextp; | |
998 | ||
999 | *scontext = NULL; | |
1000 | *scontext_len = 0; | |
1001 | ||
12b29f34 SS |
1002 | if (context->len) { |
1003 | *scontext_len = context->len; | |
1004 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
1005 | if (!(*scontext)) | |
1006 | return -ENOMEM; | |
1007 | return 0; | |
1008 | } | |
1009 | ||
1da177e4 LT |
1010 | /* Compute the size of the context. */ |
1011 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
1012 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
1013 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
1014 | *scontext_len += mls_compute_context_len(context); | |
1015 | ||
1016 | /* Allocate space for the context; caller must free this space. */ | |
1017 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 1018 | if (!scontextp) |
1da177e4 | 1019 | return -ENOMEM; |
1da177e4 LT |
1020 | *scontext = scontextp; |
1021 | ||
1022 | /* | |
1023 | * Copy the user name, role name and type name into the context. | |
1024 | */ | |
1025 | sprintf(scontextp, "%s:%s:%s", | |
1026 | policydb.p_user_val_to_name[context->user - 1], | |
1027 | policydb.p_role_val_to_name[context->role - 1], | |
1028 | policydb.p_type_val_to_name[context->type - 1]); | |
1029 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
5d55a345 EP |
1030 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + |
1031 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
1da177e4 LT |
1032 | |
1033 | mls_sid_to_context(context, &scontextp); | |
1034 | ||
1035 | *scontextp = 0; | |
1036 | ||
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | #include "initial_sid_to_string.h" | |
1041 | ||
f0ee2e46 JC |
1042 | const char *security_get_initial_sid_context(u32 sid) |
1043 | { | |
1044 | if (unlikely(sid > SECINITSID_NUM)) | |
1045 | return NULL; | |
1046 | return initial_sid_to_string[sid]; | |
1047 | } | |
1048 | ||
12b29f34 SS |
1049 | static int security_sid_to_context_core(u32 sid, char **scontext, |
1050 | u32 *scontext_len, int force) | |
1da177e4 LT |
1051 | { |
1052 | struct context *context; | |
1053 | int rc = 0; | |
1054 | ||
4f4acf3a SS |
1055 | *scontext = NULL; |
1056 | *scontext_len = 0; | |
1057 | ||
1da177e4 LT |
1058 | if (!ss_initialized) { |
1059 | if (sid <= SECINITSID_NUM) { | |
1060 | char *scontextp; | |
1061 | ||
1062 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
5d55a345 | 1063 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
0cccca06 SH |
1064 | if (!scontextp) { |
1065 | rc = -ENOMEM; | |
1066 | goto out; | |
1067 | } | |
1da177e4 LT |
1068 | strcpy(scontextp, initial_sid_to_string[sid]); |
1069 | *scontext = scontextp; | |
1070 | goto out; | |
1071 | } | |
744ba35e EP |
1072 | printk(KERN_ERR "SELinux: %s: called before initial " |
1073 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
1074 | rc = -EINVAL; |
1075 | goto out; | |
1076 | } | |
0804d113 | 1077 | read_lock(&policy_rwlock); |
12b29f34 SS |
1078 | if (force) |
1079 | context = sidtab_search_force(&sidtab, sid); | |
1080 | else | |
1081 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 1082 | if (!context) { |
744ba35e EP |
1083 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1084 | __func__, sid); | |
1da177e4 LT |
1085 | rc = -EINVAL; |
1086 | goto out_unlock; | |
1087 | } | |
1088 | rc = context_struct_to_string(context, scontext, scontext_len); | |
1089 | out_unlock: | |
0804d113 | 1090 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1091 | out: |
1092 | return rc; | |
1093 | ||
1094 | } | |
1095 | ||
12b29f34 SS |
1096 | /** |
1097 | * security_sid_to_context - Obtain a context for a given SID. | |
1098 | * @sid: security identifier, SID | |
1099 | * @scontext: security context | |
1100 | * @scontext_len: length in bytes | |
1101 | * | |
1102 | * Write the string representation of the context associated with @sid | |
1103 | * into a dynamically allocated string of the correct size. Set @scontext | |
1104 | * to point to this string and set @scontext_len to the length of the string. | |
1105 | */ | |
1106 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 1107 | { |
12b29f34 SS |
1108 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
1109 | } | |
1110 | ||
1111 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
1112 | { | |
1113 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
1114 | } | |
1115 | ||
9a59daa0 SS |
1116 | /* |
1117 | * Caveat: Mutates scontext. | |
1118 | */ | |
12b29f34 SS |
1119 | static int string_to_context_struct(struct policydb *pol, |
1120 | struct sidtab *sidtabp, | |
9a59daa0 | 1121 | char *scontext, |
12b29f34 SS |
1122 | u32 scontext_len, |
1123 | struct context *ctx, | |
9a59daa0 | 1124 | u32 def_sid) |
12b29f34 | 1125 | { |
1da177e4 LT |
1126 | struct role_datum *role; |
1127 | struct type_datum *typdatum; | |
1128 | struct user_datum *usrdatum; | |
1129 | char *scontextp, *p, oldc; | |
1130 | int rc = 0; | |
1131 | ||
12b29f34 | 1132 | context_init(ctx); |
1da177e4 | 1133 | |
1da177e4 LT |
1134 | /* Parse the security context. */ |
1135 | ||
1136 | rc = -EINVAL; | |
9a59daa0 | 1137 | scontextp = (char *) scontext; |
1da177e4 LT |
1138 | |
1139 | /* Extract the user. */ | |
1140 | p = scontextp; | |
1141 | while (*p && *p != ':') | |
1142 | p++; | |
1143 | ||
1144 | if (*p == 0) | |
12b29f34 | 1145 | goto out; |
1da177e4 LT |
1146 | |
1147 | *p++ = 0; | |
1148 | ||
12b29f34 | 1149 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1150 | if (!usrdatum) |
12b29f34 | 1151 | goto out; |
1da177e4 | 1152 | |
12b29f34 | 1153 | ctx->user = usrdatum->value; |
1da177e4 LT |
1154 | |
1155 | /* Extract role. */ | |
1156 | scontextp = p; | |
1157 | while (*p && *p != ':') | |
1158 | p++; | |
1159 | ||
1160 | if (*p == 0) | |
12b29f34 | 1161 | goto out; |
1da177e4 LT |
1162 | |
1163 | *p++ = 0; | |
1164 | ||
12b29f34 | 1165 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1166 | if (!role) |
12b29f34 SS |
1167 | goto out; |
1168 | ctx->role = role->value; | |
1da177e4 LT |
1169 | |
1170 | /* Extract type. */ | |
1171 | scontextp = p; | |
1172 | while (*p && *p != ':') | |
1173 | p++; | |
1174 | oldc = *p; | |
1175 | *p++ = 0; | |
1176 | ||
12b29f34 | 1177 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1178 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1179 | goto out; |
1da177e4 | 1180 | |
12b29f34 | 1181 | ctx->type = typdatum->value; |
1da177e4 | 1182 | |
12b29f34 | 1183 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 1184 | if (rc) |
12b29f34 | 1185 | goto out; |
1da177e4 | 1186 | |
9a59daa0 | 1187 | if ((p - scontext) < scontext_len) { |
1da177e4 | 1188 | rc = -EINVAL; |
12b29f34 | 1189 | goto out; |
1da177e4 LT |
1190 | } |
1191 | ||
1192 | /* Check the validity of the new context. */ | |
12b29f34 | 1193 | if (!policydb_context_isvalid(pol, ctx)) { |
1da177e4 | 1194 | rc = -EINVAL; |
12b29f34 | 1195 | goto out; |
1da177e4 | 1196 | } |
12b29f34 SS |
1197 | rc = 0; |
1198 | out: | |
8e531af9 EP |
1199 | if (rc) |
1200 | context_destroy(ctx); | |
12b29f34 SS |
1201 | return rc; |
1202 | } | |
1203 | ||
1204 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
1205 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
1206 | int force) | |
1207 | { | |
9a59daa0 | 1208 | char *scontext2, *str = NULL; |
12b29f34 SS |
1209 | struct context context; |
1210 | int rc = 0; | |
1211 | ||
1212 | if (!ss_initialized) { | |
1213 | int i; | |
1214 | ||
1215 | for (i = 1; i < SECINITSID_NUM; i++) { | |
1216 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
1217 | *sid = i; | |
9a59daa0 | 1218 | return 0; |
12b29f34 SS |
1219 | } |
1220 | } | |
1221 | *sid = SECINITSID_KERNEL; | |
9a59daa0 | 1222 | return 0; |
12b29f34 SS |
1223 | } |
1224 | *sid = SECSID_NULL; | |
1225 | ||
9a59daa0 SS |
1226 | /* Copy the string so that we can modify the copy as we parse it. */ |
1227 | scontext2 = kmalloc(scontext_len+1, gfp_flags); | |
1228 | if (!scontext2) | |
1229 | return -ENOMEM; | |
1230 | memcpy(scontext2, scontext, scontext_len); | |
1231 | scontext2[scontext_len] = 0; | |
1232 | ||
1233 | if (force) { | |
1234 | /* Save another copy for storing in uninterpreted form */ | |
1235 | str = kstrdup(scontext2, gfp_flags); | |
1236 | if (!str) { | |
1237 | kfree(scontext2); | |
1238 | return -ENOMEM; | |
1239 | } | |
1240 | } | |
1241 | ||
0804d113 | 1242 | read_lock(&policy_rwlock); |
12b29f34 | 1243 | rc = string_to_context_struct(&policydb, &sidtab, |
9a59daa0 SS |
1244 | scontext2, scontext_len, |
1245 | &context, def_sid); | |
12b29f34 | 1246 | if (rc == -EINVAL && force) { |
9a59daa0 | 1247 | context.str = str; |
12b29f34 | 1248 | context.len = scontext_len; |
9a59daa0 | 1249 | str = NULL; |
12b29f34 SS |
1250 | } else if (rc) |
1251 | goto out; | |
1252 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
8e531af9 | 1253 | context_destroy(&context); |
1da177e4 | 1254 | out: |
0804d113 | 1255 | read_unlock(&policy_rwlock); |
9a59daa0 SS |
1256 | kfree(scontext2); |
1257 | kfree(str); | |
1da177e4 LT |
1258 | return rc; |
1259 | } | |
1260 | ||
f5c1d5b2 JM |
1261 | /** |
1262 | * security_context_to_sid - Obtain a SID for a given security context. | |
1263 | * @scontext: security context | |
1264 | * @scontext_len: length in bytes | |
1265 | * @sid: security identifier, SID | |
1266 | * | |
1267 | * Obtains a SID associated with the security context that | |
1268 | * has the string representation specified by @scontext. | |
1269 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1270 | * memory is available, or 0 on success. | |
1271 | */ | |
8f0cfa52 | 1272 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid) |
f5c1d5b2 JM |
1273 | { |
1274 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 | 1275 | sid, SECSID_NULL, GFP_KERNEL, 0); |
f5c1d5b2 JM |
1276 | } |
1277 | ||
1278 | /** | |
1279 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1280 | * falling back to specified default if needed. | |
1281 | * | |
1282 | * @scontext: security context | |
1283 | * @scontext_len: length in bytes | |
1284 | * @sid: security identifier, SID | |
d133a960 | 1285 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1286 | * |
1287 | * Obtains a SID associated with the security context that | |
1288 | * has the string representation specified by @scontext. | |
1289 | * The default SID is passed to the MLS layer to be used to allow | |
1290 | * kernel labeling of the MLS field if the MLS field is not present | |
1291 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1292 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1293 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1294 | * memory is available, or 0 on success. | |
1295 | */ | |
7bf570dc DH |
1296 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1297 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1298 | { |
1299 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1300 | sid, def_sid, gfp_flags, 1); |
1301 | } | |
1302 | ||
1303 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1304 | u32 *sid) | |
1305 | { | |
1306 | return security_context_to_sid_core(scontext, scontext_len, | |
1307 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1308 | } |
1309 | ||
1da177e4 LT |
1310 | static int compute_sid_handle_invalid_context( |
1311 | struct context *scontext, | |
1312 | struct context *tcontext, | |
1313 | u16 tclass, | |
1314 | struct context *newcontext) | |
1315 | { | |
1316 | char *s = NULL, *t = NULL, *n = NULL; | |
1317 | u32 slen, tlen, nlen; | |
1318 | ||
1319 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
1320 | goto out; | |
1321 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
1322 | goto out; | |
1323 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
1324 | goto out; | |
9ad9ad38 | 1325 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
1326 | "security_compute_sid: invalid context %s" |
1327 | " for scontext=%s" | |
1328 | " tcontext=%s" | |
1329 | " tclass=%s", | |
1330 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
1331 | out: | |
1332 | kfree(s); | |
1333 | kfree(t); | |
1334 | kfree(n); | |
1335 | if (!selinux_enforcing) | |
1336 | return 0; | |
1337 | return -EACCES; | |
1338 | } | |
1339 | ||
1340 | static int security_compute_sid(u32 ssid, | |
1341 | u32 tsid, | |
c6d3aaa4 | 1342 | u16 orig_tclass, |
1da177e4 | 1343 | u32 specified, |
c6d3aaa4 SS |
1344 | u32 *out_sid, |
1345 | bool kern) | |
1da177e4 LT |
1346 | { |
1347 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
1348 | struct role_trans *roletr = NULL; | |
1349 | struct avtab_key avkey; | |
1350 | struct avtab_datum *avdatum; | |
1351 | struct avtab_node *node; | |
c6d3aaa4 | 1352 | u16 tclass; |
1da177e4 LT |
1353 | int rc = 0; |
1354 | ||
1355 | if (!ss_initialized) { | |
c6d3aaa4 SS |
1356 | switch (orig_tclass) { |
1357 | case SECCLASS_PROCESS: /* kernel value */ | |
1da177e4 LT |
1358 | *out_sid = ssid; |
1359 | break; | |
1360 | default: | |
1361 | *out_sid = tsid; | |
1362 | break; | |
1363 | } | |
1364 | goto out; | |
1365 | } | |
1366 | ||
851f8a69 VY |
1367 | context_init(&newcontext); |
1368 | ||
0804d113 | 1369 | read_lock(&policy_rwlock); |
1da177e4 | 1370 | |
c6d3aaa4 SS |
1371 | if (kern) |
1372 | tclass = unmap_class(orig_tclass); | |
1373 | else | |
1374 | tclass = orig_tclass; | |
1375 | ||
1da177e4 LT |
1376 | scontext = sidtab_search(&sidtab, ssid); |
1377 | if (!scontext) { | |
744ba35e EP |
1378 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1379 | __func__, ssid); | |
1da177e4 LT |
1380 | rc = -EINVAL; |
1381 | goto out_unlock; | |
1382 | } | |
1383 | tcontext = sidtab_search(&sidtab, tsid); | |
1384 | if (!tcontext) { | |
744ba35e EP |
1385 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1386 | __func__, tsid); | |
1da177e4 LT |
1387 | rc = -EINVAL; |
1388 | goto out_unlock; | |
1389 | } | |
1390 | ||
1da177e4 LT |
1391 | /* Set the user identity. */ |
1392 | switch (specified) { | |
1393 | case AVTAB_TRANSITION: | |
1394 | case AVTAB_CHANGE: | |
1395 | /* Use the process user identity. */ | |
1396 | newcontext.user = scontext->user; | |
1397 | break; | |
1398 | case AVTAB_MEMBER: | |
1399 | /* Use the related object owner. */ | |
1400 | newcontext.user = tcontext->user; | |
1401 | break; | |
1402 | } | |
1403 | ||
1404 | /* Set the role and type to default values. */ | |
c6d3aaa4 | 1405 | if (tclass == policydb.process_class) { |
1da177e4 LT |
1406 | /* Use the current role and type of process. */ |
1407 | newcontext.role = scontext->role; | |
1408 | newcontext.type = scontext->type; | |
c6d3aaa4 | 1409 | } else { |
1da177e4 LT |
1410 | /* Use the well-defined object role. */ |
1411 | newcontext.role = OBJECT_R_VAL; | |
1412 | /* Use the type of the related object. */ | |
1413 | newcontext.type = tcontext->type; | |
1414 | } | |
1415 | ||
1416 | /* Look for a type transition/member/change rule. */ | |
1417 | avkey.source_type = scontext->type; | |
1418 | avkey.target_type = tcontext->type; | |
1419 | avkey.target_class = tclass; | |
782ebb99 SS |
1420 | avkey.specified = specified; |
1421 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1422 | |
1423 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1424 | if (!avdatum) { |
782ebb99 | 1425 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1426 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1427 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1428 | avdatum = &node->datum; |
1429 | break; | |
1430 | } | |
1431 | } | |
1432 | } | |
1433 | ||
782ebb99 | 1434 | if (avdatum) { |
1da177e4 | 1435 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 1436 | newcontext.type = avdatum->data; |
1da177e4 LT |
1437 | } |
1438 | ||
1439 | /* Check for class-specific changes. */ | |
c6d3aaa4 | 1440 | if (tclass == policydb.process_class) { |
1da177e4 LT |
1441 | if (specified & AVTAB_TRANSITION) { |
1442 | /* Look for a role transition rule. */ | |
1443 | for (roletr = policydb.role_tr; roletr; | |
1444 | roletr = roletr->next) { | |
1445 | if (roletr->role == scontext->role && | |
1446 | roletr->type == tcontext->type) { | |
1447 | /* Use the role transition rule. */ | |
1448 | newcontext.role = roletr->new_role; | |
1449 | break; | |
1450 | } | |
1451 | } | |
1452 | } | |
1da177e4 LT |
1453 | } |
1454 | ||
1455 | /* Set the MLS attributes. | |
1456 | This is done last because it may allocate memory. */ | |
1457 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
1458 | if (rc) | |
1459 | goto out_unlock; | |
1460 | ||
1461 | /* Check the validity of the context. */ | |
1462 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1463 | rc = compute_sid_handle_invalid_context(scontext, | |
1464 | tcontext, | |
1465 | tclass, | |
1466 | &newcontext); | |
1467 | if (rc) | |
1468 | goto out_unlock; | |
1469 | } | |
1470 | /* Obtain the sid for the context. */ | |
1471 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1472 | out_unlock: | |
0804d113 | 1473 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1474 | context_destroy(&newcontext); |
1475 | out: | |
1476 | return rc; | |
1477 | } | |
1478 | ||
1479 | /** | |
1480 | * security_transition_sid - Compute the SID for a new subject/object. | |
1481 | * @ssid: source security identifier | |
1482 | * @tsid: target security identifier | |
1483 | * @tclass: target security class | |
1484 | * @out_sid: security identifier for new subject/object | |
1485 | * | |
1486 | * Compute a SID to use for labeling a new subject or object in the | |
1487 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1488 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1489 | * if insufficient memory is available, or %0 if the new SID was | |
1490 | * computed successfully. | |
1491 | */ | |
1492 | int security_transition_sid(u32 ssid, | |
1493 | u32 tsid, | |
1494 | u16 tclass, | |
1495 | u32 *out_sid) | |
1496 | { | |
c6d3aaa4 SS |
1497 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, |
1498 | out_sid, true); | |
1499 | } | |
1500 | ||
1501 | int security_transition_sid_user(u32 ssid, | |
1502 | u32 tsid, | |
1503 | u16 tclass, | |
1504 | u32 *out_sid) | |
1505 | { | |
1506 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, | |
1507 | out_sid, false); | |
1da177e4 LT |
1508 | } |
1509 | ||
1510 | /** | |
1511 | * security_member_sid - Compute the SID for member selection. | |
1512 | * @ssid: source security identifier | |
1513 | * @tsid: target security identifier | |
1514 | * @tclass: target security class | |
1515 | * @out_sid: security identifier for selected member | |
1516 | * | |
1517 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1518 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1519 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1520 | * if insufficient memory is available, or %0 if the SID was | |
1521 | * computed successfully. | |
1522 | */ | |
1523 | int security_member_sid(u32 ssid, | |
1524 | u32 tsid, | |
1525 | u16 tclass, | |
1526 | u32 *out_sid) | |
1527 | { | |
c6d3aaa4 SS |
1528 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid, |
1529 | false); | |
1da177e4 LT |
1530 | } |
1531 | ||
1532 | /** | |
1533 | * security_change_sid - Compute the SID for object relabeling. | |
1534 | * @ssid: source security identifier | |
1535 | * @tsid: target security identifier | |
1536 | * @tclass: target security class | |
1537 | * @out_sid: security identifier for selected member | |
1538 | * | |
1539 | * Compute a SID to use for relabeling an object of class @tclass | |
1540 | * based on a SID pair (@ssid, @tsid). | |
1541 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1542 | * if insufficient memory is available, or %0 if the SID was | |
1543 | * computed successfully. | |
1544 | */ | |
1545 | int security_change_sid(u32 ssid, | |
1546 | u32 tsid, | |
1547 | u16 tclass, | |
1548 | u32 *out_sid) | |
1549 | { | |
c6d3aaa4 SS |
1550 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid, |
1551 | false); | |
b94c7e67 CS |
1552 | } |
1553 | ||
1da177e4 LT |
1554 | /* Clone the SID into the new SID table. */ |
1555 | static int clone_sid(u32 sid, | |
1556 | struct context *context, | |
1557 | void *arg) | |
1558 | { | |
1559 | struct sidtab *s = arg; | |
1560 | ||
1561 | return sidtab_insert(s, sid, context); | |
1562 | } | |
1563 | ||
1564 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1565 | { | |
1566 | int rc = 0; | |
1567 | ||
1568 | if (selinux_enforcing) { | |
1569 | rc = -EINVAL; | |
1570 | } else { | |
1571 | char *s; | |
1572 | u32 len; | |
1573 | ||
12b29f34 SS |
1574 | if (!context_struct_to_string(context, &s, &len)) { |
1575 | printk(KERN_WARNING | |
1576 | "SELinux: Context %s would be invalid if enforcing\n", | |
1577 | s); | |
1578 | kfree(s); | |
1579 | } | |
1da177e4 LT |
1580 | } |
1581 | return rc; | |
1582 | } | |
1583 | ||
1584 | struct convert_context_args { | |
1585 | struct policydb *oldp; | |
1586 | struct policydb *newp; | |
1587 | }; | |
1588 | ||
1589 | /* | |
1590 | * Convert the values in the security context | |
1591 | * structure `c' from the values specified | |
1592 | * in the policy `p->oldp' to the values specified | |
1593 | * in the policy `p->newp'. Verify that the | |
1594 | * context is valid under the new policy. | |
1595 | */ | |
1596 | static int convert_context(u32 key, | |
1597 | struct context *c, | |
1598 | void *p) | |
1599 | { | |
1600 | struct convert_context_args *args; | |
1601 | struct context oldc; | |
1602 | struct role_datum *role; | |
1603 | struct type_datum *typdatum; | |
1604 | struct user_datum *usrdatum; | |
1605 | char *s; | |
1606 | u32 len; | |
1607 | int rc; | |
1608 | ||
1609 | args = p; | |
1610 | ||
12b29f34 SS |
1611 | if (c->str) { |
1612 | struct context ctx; | |
9a59daa0 SS |
1613 | s = kstrdup(c->str, GFP_KERNEL); |
1614 | if (!s) { | |
1615 | rc = -ENOMEM; | |
1616 | goto out; | |
1617 | } | |
1618 | rc = string_to_context_struct(args->newp, NULL, s, | |
1619 | c->len, &ctx, SECSID_NULL); | |
1620 | kfree(s); | |
12b29f34 SS |
1621 | if (!rc) { |
1622 | printk(KERN_INFO | |
1623 | "SELinux: Context %s became valid (mapped).\n", | |
1624 | c->str); | |
1625 | /* Replace string with mapped representation. */ | |
1626 | kfree(c->str); | |
1627 | memcpy(c, &ctx, sizeof(*c)); | |
1628 | goto out; | |
1629 | } else if (rc == -EINVAL) { | |
1630 | /* Retain string representation for later mapping. */ | |
1631 | rc = 0; | |
1632 | goto out; | |
1633 | } else { | |
1634 | /* Other error condition, e.g. ENOMEM. */ | |
1635 | printk(KERN_ERR | |
1636 | "SELinux: Unable to map context %s, rc = %d.\n", | |
1637 | c->str, -rc); | |
1638 | goto out; | |
1639 | } | |
1640 | } | |
1641 | ||
1da177e4 LT |
1642 | rc = context_cpy(&oldc, c); |
1643 | if (rc) | |
1644 | goto out; | |
1645 | ||
1646 | rc = -EINVAL; | |
1647 | ||
1648 | /* Convert the user. */ | |
1649 | usrdatum = hashtab_search(args->newp->p_users.table, | |
5d55a345 EP |
1650 | args->oldp->p_user_val_to_name[c->user - 1]); |
1651 | if (!usrdatum) | |
1da177e4 | 1652 | goto bad; |
1da177e4 LT |
1653 | c->user = usrdatum->value; |
1654 | ||
1655 | /* Convert the role. */ | |
1656 | role = hashtab_search(args->newp->p_roles.table, | |
5d55a345 EP |
1657 | args->oldp->p_role_val_to_name[c->role - 1]); |
1658 | if (!role) | |
1da177e4 | 1659 | goto bad; |
1da177e4 LT |
1660 | c->role = role->value; |
1661 | ||
1662 | /* Convert the type. */ | |
1663 | typdatum = hashtab_search(args->newp->p_types.table, | |
5d55a345 EP |
1664 | args->oldp->p_type_val_to_name[c->type - 1]); |
1665 | if (!typdatum) | |
1da177e4 | 1666 | goto bad; |
1da177e4 LT |
1667 | c->type = typdatum->value; |
1668 | ||
1669 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1670 | if (rc) | |
1671 | goto bad; | |
1672 | ||
1673 | /* Check the validity of the new context. */ | |
1674 | if (!policydb_context_isvalid(args->newp, c)) { | |
1675 | rc = convert_context_handle_invalid_context(&oldc); | |
1676 | if (rc) | |
1677 | goto bad; | |
1678 | } | |
1679 | ||
1680 | context_destroy(&oldc); | |
12b29f34 | 1681 | rc = 0; |
1da177e4 LT |
1682 | out: |
1683 | return rc; | |
1684 | bad: | |
12b29f34 SS |
1685 | /* Map old representation to string and save it. */ |
1686 | if (context_struct_to_string(&oldc, &s, &len)) | |
1687 | return -ENOMEM; | |
1da177e4 | 1688 | context_destroy(&oldc); |
12b29f34 SS |
1689 | context_destroy(c); |
1690 | c->str = s; | |
1691 | c->len = len; | |
1692 | printk(KERN_INFO | |
1693 | "SELinux: Context %s became invalid (unmapped).\n", | |
1694 | c->str); | |
1695 | rc = 0; | |
1da177e4 LT |
1696 | goto out; |
1697 | } | |
1698 | ||
3bb56b25 PM |
1699 | static void security_load_policycaps(void) |
1700 | { | |
1701 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1702 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1703 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1704 | POLICYDB_CAPABILITY_OPENPERM); | |
3bb56b25 PM |
1705 | } |
1706 | ||
1da177e4 | 1707 | extern void selinux_complete_init(void); |
e900a7d9 | 1708 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1709 | |
1710 | /** | |
1711 | * security_load_policy - Load a security policy configuration. | |
1712 | * @data: binary policy data | |
1713 | * @len: length of data in bytes | |
1714 | * | |
1715 | * Load a new set of security policy configuration data, | |
1716 | * validate it and convert the SID table as necessary. | |
1717 | * This function will flush the access vector cache after | |
1718 | * loading the new policy. | |
1719 | */ | |
1720 | int security_load_policy(void *data, size_t len) | |
1721 | { | |
1722 | struct policydb oldpolicydb, newpolicydb; | |
1723 | struct sidtab oldsidtab, newsidtab; | |
c6d3aaa4 | 1724 | struct selinux_mapping *oldmap, *map = NULL; |
1da177e4 LT |
1725 | struct convert_context_args args; |
1726 | u32 seqno; | |
c6d3aaa4 | 1727 | u16 map_size; |
1da177e4 LT |
1728 | int rc = 0; |
1729 | struct policy_file file = { data, len }, *fp = &file; | |
1730 | ||
1da177e4 LT |
1731 | if (!ss_initialized) { |
1732 | avtab_cache_init(); | |
1733 | if (policydb_read(&policydb, fp)) { | |
1da177e4 LT |
1734 | avtab_cache_destroy(); |
1735 | return -EINVAL; | |
1736 | } | |
c6d3aaa4 SS |
1737 | if (selinux_set_mapping(&policydb, secclass_map, |
1738 | ¤t_mapping, | |
1739 | ¤t_mapping_size)) { | |
1da177e4 LT |
1740 | policydb_destroy(&policydb); |
1741 | avtab_cache_destroy(); | |
1742 | return -EINVAL; | |
1743 | } | |
c6d3aaa4 | 1744 | if (policydb_load_isids(&policydb, &sidtab)) { |
b94c7e67 CS |
1745 | policydb_destroy(&policydb); |
1746 | avtab_cache_destroy(); | |
1747 | return -EINVAL; | |
1748 | } | |
3bb56b25 | 1749 | security_load_policycaps(); |
1da177e4 | 1750 | ss_initialized = 1; |
4c443d1b | 1751 | seqno = ++latest_granting; |
1da177e4 | 1752 | selinux_complete_init(); |
4c443d1b SS |
1753 | avc_ss_reset(seqno); |
1754 | selnl_notify_policyload(seqno); | |
7420ed23 | 1755 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1756 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1757 | return 0; |
1758 | } | |
1759 | ||
1760 | #if 0 | |
1761 | sidtab_hash_eval(&sidtab, "sids"); | |
1762 | #endif | |
1763 | ||
89abd0ac | 1764 | if (policydb_read(&newpolicydb, fp)) |
1da177e4 | 1765 | return -EINVAL; |
1da177e4 | 1766 | |
12b29f34 | 1767 | if (sidtab_init(&newsidtab)) { |
12b29f34 SS |
1768 | policydb_destroy(&newpolicydb); |
1769 | return -ENOMEM; | |
1770 | } | |
1da177e4 | 1771 | |
c6d3aaa4 SS |
1772 | if (selinux_set_mapping(&newpolicydb, secclass_map, |
1773 | &map, &map_size)) | |
b94c7e67 | 1774 | goto err; |
b94c7e67 | 1775 | |
e900a7d9 SS |
1776 | rc = security_preserve_bools(&newpolicydb); |
1777 | if (rc) { | |
454d972c | 1778 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
1779 | goto err; |
1780 | } | |
1781 | ||
1da177e4 LT |
1782 | /* Clone the SID table. */ |
1783 | sidtab_shutdown(&sidtab); | |
1784 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1785 | rc = -ENOMEM; | |
1786 | goto err; | |
1787 | } | |
1788 | ||
12b29f34 SS |
1789 | /* |
1790 | * Convert the internal representations of contexts | |
1791 | * in the new SID table. | |
1792 | */ | |
1da177e4 LT |
1793 | args.oldp = &policydb; |
1794 | args.newp = &newpolicydb; | |
12b29f34 SS |
1795 | rc = sidtab_map(&newsidtab, convert_context, &args); |
1796 | if (rc) | |
1797 | goto err; | |
1da177e4 LT |
1798 | |
1799 | /* Save the old policydb and SID table to free later. */ | |
1800 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1801 | sidtab_set(&oldsidtab, &sidtab); | |
1802 | ||
1803 | /* Install the new policydb and SID table. */ | |
0804d113 | 1804 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
1805 | memcpy(&policydb, &newpolicydb, sizeof policydb); |
1806 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1807 | security_load_policycaps(); |
c6d3aaa4 SS |
1808 | oldmap = current_mapping; |
1809 | current_mapping = map; | |
1810 | current_mapping_size = map_size; | |
1da177e4 | 1811 | seqno = ++latest_granting; |
0804d113 | 1812 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
1813 | |
1814 | /* Free the old policydb and SID table. */ | |
1815 | policydb_destroy(&oldpolicydb); | |
1816 | sidtab_destroy(&oldsidtab); | |
c6d3aaa4 | 1817 | kfree(oldmap); |
1da177e4 LT |
1818 | |
1819 | avc_ss_reset(seqno); | |
1820 | selnl_notify_policyload(seqno); | |
7420ed23 | 1821 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1822 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1823 | |
1824 | return 0; | |
1825 | ||
1826 | err: | |
c6d3aaa4 | 1827 | kfree(map); |
1da177e4 LT |
1828 | sidtab_destroy(&newsidtab); |
1829 | policydb_destroy(&newpolicydb); | |
1830 | return rc; | |
1831 | ||
1832 | } | |
1833 | ||
1834 | /** | |
1835 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
1836 | * @protocol: protocol number |
1837 | * @port: port number | |
1838 | * @out_sid: security identifier | |
1839 | */ | |
3e112172 | 1840 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
1841 | { |
1842 | struct ocontext *c; | |
1843 | int rc = 0; | |
1844 | ||
0804d113 | 1845 | read_lock(&policy_rwlock); |
1da177e4 LT |
1846 | |
1847 | c = policydb.ocontexts[OCON_PORT]; | |
1848 | while (c) { | |
1849 | if (c->u.port.protocol == protocol && | |
1850 | c->u.port.low_port <= port && | |
1851 | c->u.port.high_port >= port) | |
1852 | break; | |
1853 | c = c->next; | |
1854 | } | |
1855 | ||
1856 | if (c) { | |
1857 | if (!c->sid[0]) { | |
1858 | rc = sidtab_context_to_sid(&sidtab, | |
1859 | &c->context[0], | |
1860 | &c->sid[0]); | |
1861 | if (rc) | |
1862 | goto out; | |
1863 | } | |
1864 | *out_sid = c->sid[0]; | |
1865 | } else { | |
1866 | *out_sid = SECINITSID_PORT; | |
1867 | } | |
1868 | ||
1869 | out: | |
0804d113 | 1870 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1871 | return rc; |
1872 | } | |
1873 | ||
1874 | /** | |
1875 | * security_netif_sid - Obtain the SID for a network interface. | |
1876 | * @name: interface name | |
1877 | * @if_sid: interface SID | |
1da177e4 | 1878 | */ |
e8bfdb9d | 1879 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
1880 | { |
1881 | int rc = 0; | |
1882 | struct ocontext *c; | |
1883 | ||
0804d113 | 1884 | read_lock(&policy_rwlock); |
1da177e4 LT |
1885 | |
1886 | c = policydb.ocontexts[OCON_NETIF]; | |
1887 | while (c) { | |
1888 | if (strcmp(name, c->u.name) == 0) | |
1889 | break; | |
1890 | c = c->next; | |
1891 | } | |
1892 | ||
1893 | if (c) { | |
1894 | if (!c->sid[0] || !c->sid[1]) { | |
1895 | rc = sidtab_context_to_sid(&sidtab, | |
1896 | &c->context[0], | |
1897 | &c->sid[0]); | |
1898 | if (rc) | |
1899 | goto out; | |
1900 | rc = sidtab_context_to_sid(&sidtab, | |
1901 | &c->context[1], | |
1902 | &c->sid[1]); | |
1903 | if (rc) | |
1904 | goto out; | |
1905 | } | |
1906 | *if_sid = c->sid[0]; | |
e8bfdb9d | 1907 | } else |
1da177e4 | 1908 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
1909 | |
1910 | out: | |
0804d113 | 1911 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1912 | return rc; |
1913 | } | |
1914 | ||
1915 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1916 | { | |
1917 | int i, fail = 0; | |
1918 | ||
5d55a345 EP |
1919 | for (i = 0; i < 4; i++) |
1920 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
1921 | fail = 1; |
1922 | break; | |
1923 | } | |
1924 | ||
1925 | return !fail; | |
1926 | } | |
1927 | ||
1928 | /** | |
1929 | * security_node_sid - Obtain the SID for a node (host). | |
1930 | * @domain: communication domain aka address family | |
1931 | * @addrp: address | |
1932 | * @addrlen: address length in bytes | |
1933 | * @out_sid: security identifier | |
1934 | */ | |
1935 | int security_node_sid(u16 domain, | |
1936 | void *addrp, | |
1937 | u32 addrlen, | |
1938 | u32 *out_sid) | |
1939 | { | |
1940 | int rc = 0; | |
1941 | struct ocontext *c; | |
1942 | ||
0804d113 | 1943 | read_lock(&policy_rwlock); |
1da177e4 LT |
1944 | |
1945 | switch (domain) { | |
1946 | case AF_INET: { | |
1947 | u32 addr; | |
1948 | ||
1949 | if (addrlen != sizeof(u32)) { | |
1950 | rc = -EINVAL; | |
1951 | goto out; | |
1952 | } | |
1953 | ||
1954 | addr = *((u32 *)addrp); | |
1955 | ||
1956 | c = policydb.ocontexts[OCON_NODE]; | |
1957 | while (c) { | |
1958 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1959 | break; | |
1960 | c = c->next; | |
1961 | } | |
1962 | break; | |
1963 | } | |
1964 | ||
1965 | case AF_INET6: | |
1966 | if (addrlen != sizeof(u64) * 2) { | |
1967 | rc = -EINVAL; | |
1968 | goto out; | |
1969 | } | |
1970 | c = policydb.ocontexts[OCON_NODE6]; | |
1971 | while (c) { | |
1972 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1973 | c->u.node6.mask)) | |
1974 | break; | |
1975 | c = c->next; | |
1976 | } | |
1977 | break; | |
1978 | ||
1979 | default: | |
1980 | *out_sid = SECINITSID_NODE; | |
1981 | goto out; | |
1982 | } | |
1983 | ||
1984 | if (c) { | |
1985 | if (!c->sid[0]) { | |
1986 | rc = sidtab_context_to_sid(&sidtab, | |
1987 | &c->context[0], | |
1988 | &c->sid[0]); | |
1989 | if (rc) | |
1990 | goto out; | |
1991 | } | |
1992 | *out_sid = c->sid[0]; | |
1993 | } else { | |
1994 | *out_sid = SECINITSID_NODE; | |
1995 | } | |
1996 | ||
1997 | out: | |
0804d113 | 1998 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1999 | return rc; |
2000 | } | |
2001 | ||
2002 | #define SIDS_NEL 25 | |
2003 | ||
2004 | /** | |
2005 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
2006 | * @fromsid: starting SID | |
2007 | * @username: username | |
2008 | * @sids: array of reachable SIDs for user | |
2009 | * @nel: number of elements in @sids | |
2010 | * | |
2011 | * Generate the set of SIDs for legal security contexts | |
2012 | * for a given user that can be reached by @fromsid. | |
2013 | * Set *@sids to point to a dynamically allocated | |
2014 | * array containing the set of SIDs. Set *@nel to the | |
2015 | * number of elements in the array. | |
2016 | */ | |
2017 | ||
2018 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 2019 | char *username, |
1da177e4 LT |
2020 | u32 **sids, |
2021 | u32 *nel) | |
2022 | { | |
2023 | struct context *fromcon, usercon; | |
2c3c05db | 2024 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
2025 | u32 mynel = 0, maxnel = SIDS_NEL; |
2026 | struct user_datum *user; | |
2027 | struct role_datum *role; | |
782ebb99 | 2028 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
2029 | int rc = 0, i, j; |
2030 | ||
2c3c05db SS |
2031 | *sids = NULL; |
2032 | *nel = 0; | |
2033 | ||
2034 | if (!ss_initialized) | |
1da177e4 | 2035 | goto out; |
1da177e4 | 2036 | |
0804d113 | 2037 | read_lock(&policy_rwlock); |
1da177e4 | 2038 | |
12b29f34 SS |
2039 | context_init(&usercon); |
2040 | ||
1da177e4 LT |
2041 | fromcon = sidtab_search(&sidtab, fromsid); |
2042 | if (!fromcon) { | |
2043 | rc = -EINVAL; | |
2044 | goto out_unlock; | |
2045 | } | |
2046 | ||
2047 | user = hashtab_search(policydb.p_users.table, username); | |
2048 | if (!user) { | |
2049 | rc = -EINVAL; | |
2050 | goto out_unlock; | |
2051 | } | |
2052 | usercon.user = user->value; | |
2053 | ||
89d155ef | 2054 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
2055 | if (!mysids) { |
2056 | rc = -ENOMEM; | |
2057 | goto out_unlock; | |
2058 | } | |
1da177e4 | 2059 | |
9fe79ad1 | 2060 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 LT |
2061 | role = policydb.role_val_to_struct[i]; |
2062 | usercon.role = i+1; | |
9fe79ad1 | 2063 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
1da177e4 LT |
2064 | usercon.type = j+1; |
2065 | ||
2066 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
2067 | continue; | |
2068 | ||
1da177e4 | 2069 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 2070 | if (rc) |
1da177e4 | 2071 | goto out_unlock; |
1da177e4 LT |
2072 | if (mynel < maxnel) { |
2073 | mysids[mynel++] = sid; | |
2074 | } else { | |
2075 | maxnel += SIDS_NEL; | |
89d155ef | 2076 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
2077 | if (!mysids2) { |
2078 | rc = -ENOMEM; | |
1da177e4 LT |
2079 | goto out_unlock; |
2080 | } | |
1da177e4 LT |
2081 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2082 | kfree(mysids); | |
2083 | mysids = mysids2; | |
2084 | mysids[mynel++] = sid; | |
2085 | } | |
2086 | } | |
2087 | } | |
2088 | ||
1da177e4 | 2089 | out_unlock: |
0804d113 | 2090 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2091 | if (rc || !mynel) { |
2092 | kfree(mysids); | |
2093 | goto out; | |
2094 | } | |
2095 | ||
2096 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
2097 | if (!mysids2) { | |
2098 | rc = -ENOMEM; | |
2099 | kfree(mysids); | |
2100 | goto out; | |
2101 | } | |
2102 | for (i = 0, j = 0; i < mynel; i++) { | |
2103 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
c6d3aaa4 | 2104 | SECCLASS_PROCESS, /* kernel value */ |
2c3c05db SS |
2105 | PROCESS__TRANSITION, AVC_STRICT, |
2106 | NULL); | |
2107 | if (!rc) | |
2108 | mysids2[j++] = mysids[i]; | |
2109 | cond_resched(); | |
2110 | } | |
2111 | rc = 0; | |
2112 | kfree(mysids); | |
2113 | *sids = mysids2; | |
2114 | *nel = j; | |
1da177e4 LT |
2115 | out: |
2116 | return rc; | |
2117 | } | |
2118 | ||
2119 | /** | |
2120 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2121 | * @fstype: filesystem type | |
2122 | * @path: path from root of mount | |
2123 | * @sclass: file security class | |
2124 | * @sid: SID for path | |
2125 | * | |
2126 | * Obtain a SID to use for a file in a filesystem that | |
2127 | * cannot support xattr or use a fixed labeling behavior like | |
2128 | * transition SIDs or task SIDs. | |
2129 | */ | |
2130 | int security_genfs_sid(const char *fstype, | |
5d55a345 | 2131 | char *path, |
c6d3aaa4 | 2132 | u16 orig_sclass, |
1da177e4 LT |
2133 | u32 *sid) |
2134 | { | |
2135 | int len; | |
c6d3aaa4 | 2136 | u16 sclass; |
1da177e4 LT |
2137 | struct genfs *genfs; |
2138 | struct ocontext *c; | |
2139 | int rc = 0, cmp = 0; | |
2140 | ||
b1aa5301 SS |
2141 | while (path[0] == '/' && path[1] == '/') |
2142 | path++; | |
2143 | ||
0804d113 | 2144 | read_lock(&policy_rwlock); |
1da177e4 | 2145 | |
c6d3aaa4 SS |
2146 | sclass = unmap_class(orig_sclass); |
2147 | ||
1da177e4 LT |
2148 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { |
2149 | cmp = strcmp(fstype, genfs->fstype); | |
2150 | if (cmp <= 0) | |
2151 | break; | |
2152 | } | |
2153 | ||
2154 | if (!genfs || cmp) { | |
2155 | *sid = SECINITSID_UNLABELED; | |
2156 | rc = -ENOENT; | |
2157 | goto out; | |
2158 | } | |
2159 | ||
2160 | for (c = genfs->head; c; c = c->next) { | |
2161 | len = strlen(c->u.name); | |
2162 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2163 | (strncmp(c->u.name, path, len) == 0)) | |
2164 | break; | |
2165 | } | |
2166 | ||
2167 | if (!c) { | |
2168 | *sid = SECINITSID_UNLABELED; | |
2169 | rc = -ENOENT; | |
2170 | goto out; | |
2171 | } | |
2172 | ||
2173 | if (!c->sid[0]) { | |
2174 | rc = sidtab_context_to_sid(&sidtab, | |
2175 | &c->context[0], | |
2176 | &c->sid[0]); | |
2177 | if (rc) | |
2178 | goto out; | |
2179 | } | |
2180 | ||
2181 | *sid = c->sid[0]; | |
2182 | out: | |
0804d113 | 2183 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2184 | return rc; |
2185 | } | |
2186 | ||
2187 | /** | |
2188 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
2189 | * @fstype: filesystem type | |
2190 | * @behavior: labeling behavior | |
2191 | * @sid: SID for filesystem (superblock) | |
2192 | */ | |
2193 | int security_fs_use( | |
2194 | const char *fstype, | |
2195 | unsigned int *behavior, | |
089be43e | 2196 | u32 *sid) |
1da177e4 LT |
2197 | { |
2198 | int rc = 0; | |
2199 | struct ocontext *c; | |
2200 | ||
0804d113 | 2201 | read_lock(&policy_rwlock); |
1da177e4 LT |
2202 | |
2203 | c = policydb.ocontexts[OCON_FSUSE]; | |
2204 | while (c) { | |
2205 | if (strcmp(fstype, c->u.name) == 0) | |
2206 | break; | |
2207 | c = c->next; | |
2208 | } | |
2209 | ||
2210 | if (c) { | |
2211 | *behavior = c->v.behavior; | |
2212 | if (!c->sid[0]) { | |
2213 | rc = sidtab_context_to_sid(&sidtab, | |
2214 | &c->context[0], | |
2215 | &c->sid[0]); | |
2216 | if (rc) | |
2217 | goto out; | |
2218 | } | |
2219 | *sid = c->sid[0]; | |
2220 | } else { | |
089be43e JM |
2221 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); |
2222 | if (rc) { | |
2223 | *behavior = SECURITY_FS_USE_NONE; | |
2224 | rc = 0; | |
2225 | } else { | |
2226 | *behavior = SECURITY_FS_USE_GENFS; | |
2227 | } | |
1da177e4 LT |
2228 | } |
2229 | ||
2230 | out: | |
0804d113 | 2231 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2232 | return rc; |
2233 | } | |
2234 | ||
2235 | int security_get_bools(int *len, char ***names, int **values) | |
2236 | { | |
2237 | int i, rc = -ENOMEM; | |
2238 | ||
0804d113 | 2239 | read_lock(&policy_rwlock); |
1da177e4 LT |
2240 | *names = NULL; |
2241 | *values = NULL; | |
2242 | ||
2243 | *len = policydb.p_bools.nprim; | |
2244 | if (!*len) { | |
2245 | rc = 0; | |
2246 | goto out; | |
2247 | } | |
2248 | ||
5d55a345 | 2249 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); |
1da177e4 LT |
2250 | if (!*names) |
2251 | goto err; | |
1da177e4 | 2252 | |
e0795cf4 | 2253 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
2254 | if (!*values) |
2255 | goto err; | |
2256 | ||
2257 | for (i = 0; i < *len; i++) { | |
2258 | size_t name_len; | |
2259 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
2260 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
5d55a345 | 2261 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
2262 | if (!(*names)[i]) |
2263 | goto err; | |
2264 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
2265 | (*names)[i][name_len - 1] = 0; | |
2266 | } | |
2267 | rc = 0; | |
2268 | out: | |
0804d113 | 2269 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2270 | return rc; |
2271 | err: | |
2272 | if (*names) { | |
2273 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2274 | kfree((*names)[i]); |
1da177e4 | 2275 | } |
9a5f04bf | 2276 | kfree(*values); |
1da177e4 LT |
2277 | goto out; |
2278 | } | |
2279 | ||
2280 | ||
2281 | int security_set_bools(int len, int *values) | |
2282 | { | |
2283 | int i, rc = 0; | |
2284 | int lenp, seqno = 0; | |
2285 | struct cond_node *cur; | |
2286 | ||
0804d113 | 2287 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
2288 | |
2289 | lenp = policydb.p_bools.nprim; | |
2290 | if (len != lenp) { | |
2291 | rc = -EFAULT; | |
2292 | goto out; | |
2293 | } | |
2294 | ||
1da177e4 | 2295 | for (i = 0; i < len; i++) { |
af601e46 SG |
2296 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2297 | audit_log(current->audit_context, GFP_ATOMIC, | |
2298 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2299 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
af601e46 SG |
2300 | policydb.p_bool_val_to_name[i], |
2301 | !!values[i], | |
2302 | policydb.bool_val_to_struct[i]->state, | |
4746ec5b EP |
2303 | audit_get_loginuid(current), |
2304 | audit_get_sessionid(current)); | |
af601e46 | 2305 | } |
5d55a345 | 2306 | if (values[i]) |
1da177e4 | 2307 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2308 | else |
1da177e4 | 2309 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2310 | } |
1da177e4 | 2311 | |
dbc74c65 | 2312 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2313 | rc = evaluate_cond_node(&policydb, cur); |
2314 | if (rc) | |
2315 | goto out; | |
2316 | } | |
2317 | ||
2318 | seqno = ++latest_granting; | |
2319 | ||
2320 | out: | |
0804d113 | 2321 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2322 | if (!rc) { |
2323 | avc_ss_reset(seqno); | |
2324 | selnl_notify_policyload(seqno); | |
342a0cff | 2325 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2326 | } |
2327 | return rc; | |
2328 | } | |
2329 | ||
2330 | int security_get_bool_value(int bool) | |
2331 | { | |
2332 | int rc = 0; | |
2333 | int len; | |
2334 | ||
0804d113 | 2335 | read_lock(&policy_rwlock); |
1da177e4 LT |
2336 | |
2337 | len = policydb.p_bools.nprim; | |
2338 | if (bool >= len) { | |
2339 | rc = -EFAULT; | |
2340 | goto out; | |
2341 | } | |
2342 | ||
2343 | rc = policydb.bool_val_to_struct[bool]->state; | |
2344 | out: | |
0804d113 | 2345 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2346 | return rc; |
2347 | } | |
376bd9cb | 2348 | |
e900a7d9 SS |
2349 | static int security_preserve_bools(struct policydb *p) |
2350 | { | |
2351 | int rc, nbools = 0, *bvalues = NULL, i; | |
2352 | char **bnames = NULL; | |
2353 | struct cond_bool_datum *booldatum; | |
2354 | struct cond_node *cur; | |
2355 | ||
2356 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2357 | if (rc) | |
2358 | goto out; | |
2359 | for (i = 0; i < nbools; i++) { | |
2360 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2361 | if (booldatum) | |
2362 | booldatum->state = bvalues[i]; | |
2363 | } | |
dbc74c65 | 2364 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2365 | rc = evaluate_cond_node(p, cur); |
2366 | if (rc) | |
2367 | goto out; | |
2368 | } | |
2369 | ||
2370 | out: | |
2371 | if (bnames) { | |
2372 | for (i = 0; i < nbools; i++) | |
2373 | kfree(bnames[i]); | |
2374 | } | |
2375 | kfree(bnames); | |
2376 | kfree(bvalues); | |
2377 | return rc; | |
2378 | } | |
2379 | ||
08554d6b VY |
2380 | /* |
2381 | * security_sid_mls_copy() - computes a new sid based on the given | |
2382 | * sid and the mls portion of mls_sid. | |
2383 | */ | |
2384 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2385 | { | |
2386 | struct context *context1; | |
2387 | struct context *context2; | |
2388 | struct context newcon; | |
2389 | char *s; | |
2390 | u32 len; | |
2391 | int rc = 0; | |
2392 | ||
4eb327b5 | 2393 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
2394 | *new_sid = sid; |
2395 | goto out; | |
2396 | } | |
2397 | ||
2398 | context_init(&newcon); | |
2399 | ||
0804d113 | 2400 | read_lock(&policy_rwlock); |
08554d6b VY |
2401 | context1 = sidtab_search(&sidtab, sid); |
2402 | if (!context1) { | |
744ba35e EP |
2403 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2404 | __func__, sid); | |
08554d6b VY |
2405 | rc = -EINVAL; |
2406 | goto out_unlock; | |
2407 | } | |
2408 | ||
2409 | context2 = sidtab_search(&sidtab, mls_sid); | |
2410 | if (!context2) { | |
744ba35e EP |
2411 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2412 | __func__, mls_sid); | |
08554d6b VY |
2413 | rc = -EINVAL; |
2414 | goto out_unlock; | |
2415 | } | |
2416 | ||
2417 | newcon.user = context1->user; | |
2418 | newcon.role = context1->role; | |
2419 | newcon.type = context1->type; | |
0efc61ea | 2420 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2421 | if (rc) |
2422 | goto out_unlock; | |
2423 | ||
08554d6b VY |
2424 | /* Check the validity of the new context. */ |
2425 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2426 | rc = convert_context_handle_invalid_context(&newcon); | |
2427 | if (rc) | |
2428 | goto bad; | |
2429 | } | |
2430 | ||
2431 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
2432 | goto out_unlock; | |
2433 | ||
2434 | bad: | |
2435 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2436 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2437 | "security_sid_mls_copy: invalid context %s", s); | |
2438 | kfree(s); | |
2439 | } | |
2440 | ||
2441 | out_unlock: | |
0804d113 | 2442 | read_unlock(&policy_rwlock); |
08554d6b VY |
2443 | context_destroy(&newcon); |
2444 | out: | |
2445 | return rc; | |
2446 | } | |
2447 | ||
220deb96 PM |
2448 | /** |
2449 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2450 | * @nlbl_sid: NetLabel SID | |
2451 | * @nlbl_type: NetLabel labeling protocol type | |
2452 | * @xfrm_sid: XFRM SID | |
2453 | * | |
2454 | * Description: | |
2455 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2456 | * resolved into a single SID it is returned via @peer_sid and the function | |
2457 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2458 | * returns a negative value. A table summarizing the behavior is below: | |
2459 | * | |
2460 | * | function return | @sid | |
2461 | * ------------------------------+-----------------+----------------- | |
2462 | * no peer labels | 0 | SECSID_NULL | |
2463 | * single peer label | 0 | <peer_label> | |
2464 | * multiple, consistent labels | 0 | <peer_label> | |
2465 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2466 | * | |
2467 | */ | |
2468 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2469 | u32 xfrm_sid, | |
2470 | u32 *peer_sid) | |
2471 | { | |
2472 | int rc; | |
2473 | struct context *nlbl_ctx; | |
2474 | struct context *xfrm_ctx; | |
2475 | ||
2476 | /* handle the common (which also happens to be the set of easy) cases | |
2477 | * right away, these two if statements catch everything involving a | |
2478 | * single or absent peer SID/label */ | |
2479 | if (xfrm_sid == SECSID_NULL) { | |
2480 | *peer_sid = nlbl_sid; | |
2481 | return 0; | |
2482 | } | |
2483 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2484 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2485 | * is present */ | |
2486 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2487 | *peer_sid = xfrm_sid; | |
2488 | return 0; | |
2489 | } | |
2490 | ||
2491 | /* we don't need to check ss_initialized here since the only way both | |
2492 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2493 | * security server was initialized and ss_initialized was true */ | |
2494 | if (!selinux_mls_enabled) { | |
2495 | *peer_sid = SECSID_NULL; | |
2496 | return 0; | |
2497 | } | |
2498 | ||
0804d113 | 2499 | read_lock(&policy_rwlock); |
220deb96 PM |
2500 | |
2501 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); | |
2502 | if (!nlbl_ctx) { | |
744ba35e EP |
2503 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2504 | __func__, nlbl_sid); | |
220deb96 PM |
2505 | rc = -EINVAL; |
2506 | goto out_slowpath; | |
2507 | } | |
2508 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); | |
2509 | if (!xfrm_ctx) { | |
744ba35e EP |
2510 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2511 | __func__, xfrm_sid); | |
220deb96 PM |
2512 | rc = -EINVAL; |
2513 | goto out_slowpath; | |
2514 | } | |
2515 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
2516 | ||
2517 | out_slowpath: | |
0804d113 | 2518 | read_unlock(&policy_rwlock); |
220deb96 PM |
2519 | if (rc == 0) |
2520 | /* at present NetLabel SIDs/labels really only carry MLS | |
2521 | * information so if the MLS portion of the NetLabel SID | |
2522 | * matches the MLS portion of the labeled XFRM SID/label | |
2523 | * then pass along the XFRM SID as it is the most | |
2524 | * expressive */ | |
2525 | *peer_sid = xfrm_sid; | |
2526 | else | |
2527 | *peer_sid = SECSID_NULL; | |
2528 | return rc; | |
2529 | } | |
2530 | ||
55fcf09b CP |
2531 | static int get_classes_callback(void *k, void *d, void *args) |
2532 | { | |
2533 | struct class_datum *datum = d; | |
2534 | char *name = k, **classes = args; | |
2535 | int value = datum->value - 1; | |
2536 | ||
2537 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2538 | if (!classes[value]) | |
2539 | return -ENOMEM; | |
2540 | ||
2541 | return 0; | |
2542 | } | |
2543 | ||
2544 | int security_get_classes(char ***classes, int *nclasses) | |
2545 | { | |
2546 | int rc = -ENOMEM; | |
2547 | ||
0804d113 | 2548 | read_lock(&policy_rwlock); |
55fcf09b CP |
2549 | |
2550 | *nclasses = policydb.p_classes.nprim; | |
2551 | *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC); | |
2552 | if (!*classes) | |
2553 | goto out; | |
2554 | ||
2555 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2556 | *classes); | |
2557 | if (rc < 0) { | |
2558 | int i; | |
2559 | for (i = 0; i < *nclasses; i++) | |
2560 | kfree((*classes)[i]); | |
2561 | kfree(*classes); | |
2562 | } | |
2563 | ||
2564 | out: | |
0804d113 | 2565 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2566 | return rc; |
2567 | } | |
2568 | ||
2569 | static int get_permissions_callback(void *k, void *d, void *args) | |
2570 | { | |
2571 | struct perm_datum *datum = d; | |
2572 | char *name = k, **perms = args; | |
2573 | int value = datum->value - 1; | |
2574 | ||
2575 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2576 | if (!perms[value]) | |
2577 | return -ENOMEM; | |
2578 | ||
2579 | return 0; | |
2580 | } | |
2581 | ||
2582 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2583 | { | |
2584 | int rc = -ENOMEM, i; | |
2585 | struct class_datum *match; | |
2586 | ||
0804d113 | 2587 | read_lock(&policy_rwlock); |
55fcf09b CP |
2588 | |
2589 | match = hashtab_search(policydb.p_classes.table, class); | |
2590 | if (!match) { | |
744ba35e | 2591 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2592 | __func__, class); |
55fcf09b CP |
2593 | rc = -EINVAL; |
2594 | goto out; | |
2595 | } | |
2596 | ||
2597 | *nperms = match->permissions.nprim; | |
2598 | *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC); | |
2599 | if (!*perms) | |
2600 | goto out; | |
2601 | ||
2602 | if (match->comdatum) { | |
2603 | rc = hashtab_map(match->comdatum->permissions.table, | |
2604 | get_permissions_callback, *perms); | |
2605 | if (rc < 0) | |
2606 | goto err; | |
2607 | } | |
2608 | ||
2609 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2610 | *perms); | |
2611 | if (rc < 0) | |
2612 | goto err; | |
2613 | ||
2614 | out: | |
0804d113 | 2615 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2616 | return rc; |
2617 | ||
2618 | err: | |
0804d113 | 2619 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2620 | for (i = 0; i < *nperms; i++) |
2621 | kfree((*perms)[i]); | |
2622 | kfree(*perms); | |
2623 | return rc; | |
2624 | } | |
2625 | ||
3f12070e EP |
2626 | int security_get_reject_unknown(void) |
2627 | { | |
2628 | return policydb.reject_unknown; | |
2629 | } | |
2630 | ||
2631 | int security_get_allow_unknown(void) | |
2632 | { | |
2633 | return policydb.allow_unknown; | |
2634 | } | |
2635 | ||
3bb56b25 PM |
2636 | /** |
2637 | * security_policycap_supported - Check for a specific policy capability | |
2638 | * @req_cap: capability | |
2639 | * | |
2640 | * Description: | |
2641 | * This function queries the currently loaded policy to see if it supports the | |
2642 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2643 | * supported, false (0) if it isn't supported. | |
2644 | * | |
2645 | */ | |
2646 | int security_policycap_supported(unsigned int req_cap) | |
2647 | { | |
2648 | int rc; | |
2649 | ||
0804d113 | 2650 | read_lock(&policy_rwlock); |
3bb56b25 | 2651 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 2652 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
2653 | |
2654 | return rc; | |
2655 | } | |
2656 | ||
376bd9cb DG |
2657 | struct selinux_audit_rule { |
2658 | u32 au_seqno; | |
2659 | struct context au_ctxt; | |
2660 | }; | |
2661 | ||
9d57a7f9 | 2662 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 2663 | { |
9d57a7f9 AD |
2664 | struct selinux_audit_rule *rule = vrule; |
2665 | ||
376bd9cb DG |
2666 | if (rule) { |
2667 | context_destroy(&rule->au_ctxt); | |
2668 | kfree(rule); | |
2669 | } | |
2670 | } | |
2671 | ||
9d57a7f9 | 2672 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
2673 | { |
2674 | struct selinux_audit_rule *tmprule; | |
2675 | struct role_datum *roledatum; | |
2676 | struct type_datum *typedatum; | |
2677 | struct user_datum *userdatum; | |
9d57a7f9 | 2678 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
2679 | int rc = 0; |
2680 | ||
2681 | *rule = NULL; | |
2682 | ||
2683 | if (!ss_initialized) | |
3ad40d64 | 2684 | return -EOPNOTSUPP; |
376bd9cb DG |
2685 | |
2686 | switch (field) { | |
3a6b9f85 DG |
2687 | case AUDIT_SUBJ_USER: |
2688 | case AUDIT_SUBJ_ROLE: | |
2689 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2690 | case AUDIT_OBJ_USER: |
2691 | case AUDIT_OBJ_ROLE: | |
2692 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 2693 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 2694 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
2695 | return -EINVAL; |
2696 | break; | |
3a6b9f85 DG |
2697 | case AUDIT_SUBJ_SEN: |
2698 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2699 | case AUDIT_OBJ_LEV_LOW: |
2700 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2701 | /* we do not allow a range, indicated by the presense of '-' */ |
2702 | if (strchr(rulestr, '-')) | |
2703 | return -EINVAL; | |
2704 | break; | |
2705 | default: | |
2706 | /* only the above fields are valid */ | |
2707 | return -EINVAL; | |
2708 | } | |
2709 | ||
2710 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2711 | if (!tmprule) | |
2712 | return -ENOMEM; | |
2713 | ||
2714 | context_init(&tmprule->au_ctxt); | |
2715 | ||
0804d113 | 2716 | read_lock(&policy_rwlock); |
376bd9cb DG |
2717 | |
2718 | tmprule->au_seqno = latest_granting; | |
2719 | ||
2720 | switch (field) { | |
3a6b9f85 | 2721 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2722 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2723 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2724 | if (!userdatum) | |
2725 | rc = -EINVAL; | |
2726 | else | |
2727 | tmprule->au_ctxt.user = userdatum->value; | |
2728 | break; | |
3a6b9f85 | 2729 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2730 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2731 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2732 | if (!roledatum) | |
2733 | rc = -EINVAL; | |
2734 | else | |
2735 | tmprule->au_ctxt.role = roledatum->value; | |
2736 | break; | |
3a6b9f85 | 2737 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2738 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2739 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2740 | if (!typedatum) | |
2741 | rc = -EINVAL; | |
2742 | else | |
2743 | tmprule->au_ctxt.type = typedatum->value; | |
2744 | break; | |
3a6b9f85 DG |
2745 | case AUDIT_SUBJ_SEN: |
2746 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2747 | case AUDIT_OBJ_LEV_LOW: |
2748 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2749 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2750 | break; | |
2751 | } | |
2752 | ||
0804d113 | 2753 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2754 | |
2755 | if (rc) { | |
2756 | selinux_audit_rule_free(tmprule); | |
2757 | tmprule = NULL; | |
2758 | } | |
2759 | ||
2760 | *rule = tmprule; | |
2761 | ||
2762 | return rc; | |
2763 | } | |
2764 | ||
9d57a7f9 AD |
2765 | /* Check to see if the rule contains any selinux fields */ |
2766 | int selinux_audit_rule_known(struct audit_krule *rule) | |
2767 | { | |
2768 | int i; | |
2769 | ||
2770 | for (i = 0; i < rule->field_count; i++) { | |
2771 | struct audit_field *f = &rule->fields[i]; | |
2772 | switch (f->type) { | |
2773 | case AUDIT_SUBJ_USER: | |
2774 | case AUDIT_SUBJ_ROLE: | |
2775 | case AUDIT_SUBJ_TYPE: | |
2776 | case AUDIT_SUBJ_SEN: | |
2777 | case AUDIT_SUBJ_CLR: | |
2778 | case AUDIT_OBJ_USER: | |
2779 | case AUDIT_OBJ_ROLE: | |
2780 | case AUDIT_OBJ_TYPE: | |
2781 | case AUDIT_OBJ_LEV_LOW: | |
2782 | case AUDIT_OBJ_LEV_HIGH: | |
2783 | return 1; | |
2784 | } | |
2785 | } | |
2786 | ||
2787 | return 0; | |
2788 | } | |
2789 | ||
2790 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 2791 | struct audit_context *actx) |
376bd9cb DG |
2792 | { |
2793 | struct context *ctxt; | |
2794 | struct mls_level *level; | |
9d57a7f9 | 2795 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
2796 | int match = 0; |
2797 | ||
2798 | if (!rule) { | |
2799 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2800 | "selinux_audit_rule_match: missing rule\n"); |
376bd9cb DG |
2801 | return -ENOENT; |
2802 | } | |
2803 | ||
0804d113 | 2804 | read_lock(&policy_rwlock); |
376bd9cb DG |
2805 | |
2806 | if (rule->au_seqno < latest_granting) { | |
2807 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2808 | "selinux_audit_rule_match: stale rule\n"); |
376bd9cb DG |
2809 | match = -ESTALE; |
2810 | goto out; | |
2811 | } | |
2812 | ||
9a2f44f0 | 2813 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2814 | if (!ctxt) { |
2815 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 EP |
2816 | "selinux_audit_rule_match: unrecognized SID %d\n", |
2817 | sid); | |
376bd9cb DG |
2818 | match = -ENOENT; |
2819 | goto out; | |
2820 | } | |
2821 | ||
2822 | /* a field/op pair that is not caught here will simply fall through | |
2823 | without a match */ | |
2824 | switch (field) { | |
3a6b9f85 | 2825 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2826 | case AUDIT_OBJ_USER: |
376bd9cb | 2827 | switch (op) { |
5af75d8d | 2828 | case Audit_equal: |
376bd9cb DG |
2829 | match = (ctxt->user == rule->au_ctxt.user); |
2830 | break; | |
5af75d8d | 2831 | case Audit_not_equal: |
376bd9cb DG |
2832 | match = (ctxt->user != rule->au_ctxt.user); |
2833 | break; | |
2834 | } | |
2835 | break; | |
3a6b9f85 | 2836 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2837 | case AUDIT_OBJ_ROLE: |
376bd9cb | 2838 | switch (op) { |
5af75d8d | 2839 | case Audit_equal: |
376bd9cb DG |
2840 | match = (ctxt->role == rule->au_ctxt.role); |
2841 | break; | |
5af75d8d | 2842 | case Audit_not_equal: |
376bd9cb DG |
2843 | match = (ctxt->role != rule->au_ctxt.role); |
2844 | break; | |
2845 | } | |
2846 | break; | |
3a6b9f85 | 2847 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2848 | case AUDIT_OBJ_TYPE: |
376bd9cb | 2849 | switch (op) { |
5af75d8d | 2850 | case Audit_equal: |
376bd9cb DG |
2851 | match = (ctxt->type == rule->au_ctxt.type); |
2852 | break; | |
5af75d8d | 2853 | case Audit_not_equal: |
376bd9cb DG |
2854 | match = (ctxt->type != rule->au_ctxt.type); |
2855 | break; | |
2856 | } | |
2857 | break; | |
3a6b9f85 DG |
2858 | case AUDIT_SUBJ_SEN: |
2859 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2860 | case AUDIT_OBJ_LEV_LOW: |
2861 | case AUDIT_OBJ_LEV_HIGH: | |
2862 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
2863 | field == AUDIT_OBJ_LEV_LOW) ? |
2864 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 2865 | switch (op) { |
5af75d8d | 2866 | case Audit_equal: |
376bd9cb | 2867 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2868 | level); |
376bd9cb | 2869 | break; |
5af75d8d | 2870 | case Audit_not_equal: |
376bd9cb | 2871 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2872 | level); |
376bd9cb | 2873 | break; |
5af75d8d | 2874 | case Audit_lt: |
376bd9cb | 2875 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
2876 | level) && |
2877 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2878 | level)); | |
376bd9cb | 2879 | break; |
5af75d8d | 2880 | case Audit_le: |
376bd9cb | 2881 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 2882 | level); |
376bd9cb | 2883 | break; |
5af75d8d | 2884 | case Audit_gt: |
376bd9cb | 2885 | match = (mls_level_dom(level, |
5d55a345 EP |
2886 | &rule->au_ctxt.range.level[0]) && |
2887 | !mls_level_eq(level, | |
2888 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 2889 | break; |
5af75d8d | 2890 | case Audit_ge: |
376bd9cb | 2891 | match = mls_level_dom(level, |
5d55a345 | 2892 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
2893 | break; |
2894 | } | |
2895 | } | |
2896 | ||
2897 | out: | |
0804d113 | 2898 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2899 | return match; |
2900 | } | |
2901 | ||
9d57a7f9 | 2902 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb DG |
2903 | |
2904 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
f5269710 | 2905 | u16 class, u32 perms, u32 *retained) |
376bd9cb DG |
2906 | { |
2907 | int err = 0; | |
2908 | ||
2909 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2910 | err = aurule_callback(); | |
2911 | return err; | |
2912 | } | |
2913 | ||
2914 | static int __init aurule_init(void) | |
2915 | { | |
2916 | int err; | |
2917 | ||
2918 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
5d55a345 | 2919 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); |
376bd9cb DG |
2920 | if (err) |
2921 | panic("avc_add_callback() failed, error %d\n", err); | |
2922 | ||
2923 | return err; | |
2924 | } | |
2925 | __initcall(aurule_init); | |
2926 | ||
7420ed23 | 2927 | #ifdef CONFIG_NETLABEL |
7420ed23 | 2928 | /** |
5778eabd PM |
2929 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2930 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 2931 | * @sid: the SELinux SID |
7420ed23 VY |
2932 | * |
2933 | * Description: | |
2934 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2935 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2936 | * already been initialized. | |
7420ed23 VY |
2937 | * |
2938 | */ | |
5778eabd | 2939 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 2940 | u32 sid) |
7420ed23 | 2941 | { |
5dbe1eb0 | 2942 | u32 *sid_cache; |
7420ed23 | 2943 | |
5dbe1eb0 PM |
2944 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
2945 | if (sid_cache == NULL) | |
5778eabd | 2946 | return; |
5dbe1eb0 PM |
2947 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2948 | if (secattr->cache == NULL) { | |
2949 | kfree(sid_cache); | |
5778eabd | 2950 | return; |
0ec8abd7 | 2951 | } |
7420ed23 | 2952 | |
5dbe1eb0 PM |
2953 | *sid_cache = sid; |
2954 | secattr->cache->free = kfree; | |
2955 | secattr->cache->data = sid_cache; | |
5778eabd | 2956 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
2957 | } |
2958 | ||
2959 | /** | |
5778eabd | 2960 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 2961 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
2962 | * @sid: the SELinux SID |
2963 | * | |
2964 | * Description: | |
5778eabd | 2965 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2966 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5dbe1eb0 PM |
2967 | * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the |
2968 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to | |
2969 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
2970 | * conversion for future lookups. Returns zero on success, negative values on | |
2971 | * failure. | |
7420ed23 VY |
2972 | * |
2973 | */ | |
5778eabd | 2974 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 2975 | u32 *sid) |
7420ed23 VY |
2976 | { |
2977 | int rc = -EIDRM; | |
2978 | struct context *ctx; | |
2979 | struct context ctx_new; | |
5778eabd PM |
2980 | |
2981 | if (!ss_initialized) { | |
2982 | *sid = SECSID_NULL; | |
2983 | return 0; | |
2984 | } | |
7420ed23 | 2985 | |
0804d113 | 2986 | read_lock(&policy_rwlock); |
7420ed23 | 2987 | |
701a90ba | 2988 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
5dbe1eb0 PM |
2989 | *sid = *(u32 *)secattr->cache->data; |
2990 | rc = 0; | |
16efd454 PM |
2991 | } else if (secattr->flags & NETLBL_SECATTR_SECID) { |
2992 | *sid = secattr->attr.secid; | |
2993 | rc = 0; | |
701a90ba | 2994 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
5dbe1eb0 | 2995 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 VY |
2996 | if (ctx == NULL) |
2997 | goto netlbl_secattr_to_sid_return; | |
2998 | ||
81990fbd | 2999 | context_init(&ctx_new); |
7420ed23 VY |
3000 | ctx_new.user = ctx->user; |
3001 | ctx_new.role = ctx->role; | |
3002 | ctx_new.type = ctx->type; | |
02752760 | 3003 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 3004 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 | 3005 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
16efd454 | 3006 | secattr->attr.mls.cat) != 0) |
7420ed23 | 3007 | goto netlbl_secattr_to_sid_return; |
81990fbd PM |
3008 | memcpy(&ctx_new.range.level[1].cat, |
3009 | &ctx_new.range.level[0].cat, | |
3010 | sizeof(ctx_new.range.level[0].cat)); | |
7420ed23 VY |
3011 | } |
3012 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
3013 | goto netlbl_secattr_to_sid_return_cleanup; | |
3014 | ||
3015 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
3016 | if (rc != 0) | |
3017 | goto netlbl_secattr_to_sid_return_cleanup; | |
3018 | ||
5dbe1eb0 | 3019 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 3020 | |
7420ed23 VY |
3021 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
3022 | } else { | |
388b2405 | 3023 | *sid = SECSID_NULL; |
7420ed23 VY |
3024 | rc = 0; |
3025 | } | |
3026 | ||
3027 | netlbl_secattr_to_sid_return: | |
0804d113 | 3028 | read_unlock(&policy_rwlock); |
7420ed23 VY |
3029 | return rc; |
3030 | netlbl_secattr_to_sid_return_cleanup: | |
3031 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
3032 | goto netlbl_secattr_to_sid_return; | |
3033 | } | |
3034 | ||
3035 | /** | |
5778eabd PM |
3036 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
3037 | * @sid: the SELinux SID | |
3038 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
3039 | * |
3040 | * Description: | |
5778eabd PM |
3041 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
3042 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
3043 | * |
3044 | */ | |
5778eabd | 3045 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 3046 | { |
99d854d2 | 3047 | int rc; |
7420ed23 VY |
3048 | struct context *ctx; |
3049 | ||
3050 | if (!ss_initialized) | |
3051 | return 0; | |
3052 | ||
0804d113 | 3053 | read_lock(&policy_rwlock); |
7420ed23 | 3054 | ctx = sidtab_search(&sidtab, sid); |
99d854d2 PM |
3055 | if (ctx == NULL) { |
3056 | rc = -ENOENT; | |
5778eabd | 3057 | goto netlbl_sid_to_secattr_failure; |
99d854d2 | 3058 | } |
5778eabd PM |
3059 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], |
3060 | GFP_ATOMIC); | |
99d854d2 PM |
3061 | if (secattr->domain == NULL) { |
3062 | rc = -ENOMEM; | |
3063 | goto netlbl_sid_to_secattr_failure; | |
3064 | } | |
8d75899d PM |
3065 | secattr->attr.secid = sid; |
3066 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
3067 | mls_export_netlbl_lvl(ctx, secattr); |
3068 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 3069 | if (rc != 0) |
5778eabd | 3070 | goto netlbl_sid_to_secattr_failure; |
0804d113 | 3071 | read_unlock(&policy_rwlock); |
99f59ed0 | 3072 | |
5778eabd | 3073 | return 0; |
f8687afe | 3074 | |
5778eabd | 3075 | netlbl_sid_to_secattr_failure: |
0804d113 | 3076 | read_unlock(&policy_rwlock); |
f8687afe PM |
3077 | return rc; |
3078 | } | |
7420ed23 | 3079 | #endif /* CONFIG_NETLABEL */ |