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 | } | |
0bce9527 EP |
242 | /* |
243 | * In case the kernel has a bug and requests a permission | |
244 | * between num_perms and the maximum permission number, we | |
245 | * should audit that denial | |
246 | */ | |
247 | for (; i < (sizeof(u32)*8); i++) | |
248 | result |= 1<<i; | |
c6d3aaa4 SS |
249 | avd->auditdeny = result; |
250 | } | |
251 | } | |
252 | ||
253 | ||
1da177e4 LT |
254 | /* |
255 | * Return the boolean value of a constraint expression | |
256 | * when it is applied to the specified source and target | |
257 | * security contexts. | |
258 | * | |
259 | * xcontext is a special beast... It is used by the validatetrans rules | |
260 | * only. For these rules, scontext is the context before the transition, | |
261 | * tcontext is the context after the transition, and xcontext is the context | |
262 | * of the process performing the transition. All other callers of | |
263 | * constraint_expr_eval should pass in NULL for xcontext. | |
264 | */ | |
265 | static int constraint_expr_eval(struct context *scontext, | |
266 | struct context *tcontext, | |
267 | struct context *xcontext, | |
268 | struct constraint_expr *cexpr) | |
269 | { | |
270 | u32 val1, val2; | |
271 | struct context *c; | |
272 | struct role_datum *r1, *r2; | |
273 | struct mls_level *l1, *l2; | |
274 | struct constraint_expr *e; | |
275 | int s[CEXPR_MAXDEPTH]; | |
276 | int sp = -1; | |
277 | ||
278 | for (e = cexpr; e; e = e->next) { | |
279 | switch (e->expr_type) { | |
280 | case CEXPR_NOT: | |
281 | BUG_ON(sp < 0); | |
282 | s[sp] = !s[sp]; | |
283 | break; | |
284 | case CEXPR_AND: | |
285 | BUG_ON(sp < 1); | |
286 | sp--; | |
287 | s[sp] &= s[sp+1]; | |
288 | break; | |
289 | case CEXPR_OR: | |
290 | BUG_ON(sp < 1); | |
291 | sp--; | |
292 | s[sp] |= s[sp+1]; | |
293 | break; | |
294 | case CEXPR_ATTR: | |
295 | if (sp == (CEXPR_MAXDEPTH-1)) | |
296 | return 0; | |
297 | switch (e->attr) { | |
298 | case CEXPR_USER: | |
299 | val1 = scontext->user; | |
300 | val2 = tcontext->user; | |
301 | break; | |
302 | case CEXPR_TYPE: | |
303 | val1 = scontext->type; | |
304 | val2 = tcontext->type; | |
305 | break; | |
306 | case CEXPR_ROLE: | |
307 | val1 = scontext->role; | |
308 | val2 = tcontext->role; | |
309 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
310 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
311 | switch (e->op) { | |
312 | case CEXPR_DOM: | |
313 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
314 | val2 - 1); | |
315 | continue; | |
316 | case CEXPR_DOMBY: | |
317 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
318 | val1 - 1); | |
319 | continue; | |
320 | case CEXPR_INCOMP: | |
5d55a345 EP |
321 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
322 | val2 - 1) && | |
323 | !ebitmap_get_bit(&r2->dominates, | |
324 | val1 - 1)); | |
1da177e4 LT |
325 | continue; |
326 | default: | |
327 | break; | |
328 | } | |
329 | break; | |
330 | case CEXPR_L1L2: | |
331 | l1 = &(scontext->range.level[0]); | |
332 | l2 = &(tcontext->range.level[0]); | |
333 | goto mls_ops; | |
334 | case CEXPR_L1H2: | |
335 | l1 = &(scontext->range.level[0]); | |
336 | l2 = &(tcontext->range.level[1]); | |
337 | goto mls_ops; | |
338 | case CEXPR_H1L2: | |
339 | l1 = &(scontext->range.level[1]); | |
340 | l2 = &(tcontext->range.level[0]); | |
341 | goto mls_ops; | |
342 | case CEXPR_H1H2: | |
343 | l1 = &(scontext->range.level[1]); | |
344 | l2 = &(tcontext->range.level[1]); | |
345 | goto mls_ops; | |
346 | case CEXPR_L1H1: | |
347 | l1 = &(scontext->range.level[0]); | |
348 | l2 = &(scontext->range.level[1]); | |
349 | goto mls_ops; | |
350 | case CEXPR_L2H2: | |
351 | l1 = &(tcontext->range.level[0]); | |
352 | l2 = &(tcontext->range.level[1]); | |
353 | goto mls_ops; | |
354 | mls_ops: | |
355 | switch (e->op) { | |
356 | case CEXPR_EQ: | |
357 | s[++sp] = mls_level_eq(l1, l2); | |
358 | continue; | |
359 | case CEXPR_NEQ: | |
360 | s[++sp] = !mls_level_eq(l1, l2); | |
361 | continue; | |
362 | case CEXPR_DOM: | |
363 | s[++sp] = mls_level_dom(l1, l2); | |
364 | continue; | |
365 | case CEXPR_DOMBY: | |
366 | s[++sp] = mls_level_dom(l2, l1); | |
367 | continue; | |
368 | case CEXPR_INCOMP: | |
369 | s[++sp] = mls_level_incomp(l2, l1); | |
370 | continue; | |
371 | default: | |
372 | BUG(); | |
373 | return 0; | |
374 | } | |
375 | break; | |
376 | default: | |
377 | BUG(); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | switch (e->op) { | |
382 | case CEXPR_EQ: | |
383 | s[++sp] = (val1 == val2); | |
384 | break; | |
385 | case CEXPR_NEQ: | |
386 | s[++sp] = (val1 != val2); | |
387 | break; | |
388 | default: | |
389 | BUG(); | |
390 | return 0; | |
391 | } | |
392 | break; | |
393 | case CEXPR_NAMES: | |
394 | if (sp == (CEXPR_MAXDEPTH-1)) | |
395 | return 0; | |
396 | c = scontext; | |
397 | if (e->attr & CEXPR_TARGET) | |
398 | c = tcontext; | |
399 | else if (e->attr & CEXPR_XTARGET) { | |
400 | c = xcontext; | |
401 | if (!c) { | |
402 | BUG(); | |
403 | return 0; | |
404 | } | |
405 | } | |
406 | if (e->attr & CEXPR_USER) | |
407 | val1 = c->user; | |
408 | else if (e->attr & CEXPR_ROLE) | |
409 | val1 = c->role; | |
410 | else if (e->attr & CEXPR_TYPE) | |
411 | val1 = c->type; | |
412 | else { | |
413 | BUG(); | |
414 | return 0; | |
415 | } | |
416 | ||
417 | switch (e->op) { | |
418 | case CEXPR_EQ: | |
419 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
420 | break; | |
421 | case CEXPR_NEQ: | |
422 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
423 | break; | |
424 | default: | |
425 | BUG(); | |
426 | return 0; | |
427 | } | |
428 | break; | |
429 | default: | |
430 | BUG(); | |
431 | return 0; | |
432 | } | |
433 | } | |
434 | ||
435 | BUG_ON(sp != 0); | |
436 | return s[0]; | |
437 | } | |
438 | ||
44c2d9bd KK |
439 | /* |
440 | * security_dump_masked_av - dumps masked permissions during | |
441 | * security_compute_av due to RBAC, MLS/Constraint and Type bounds. | |
442 | */ | |
443 | static int dump_masked_av_helper(void *k, void *d, void *args) | |
444 | { | |
445 | struct perm_datum *pdatum = d; | |
446 | char **permission_names = args; | |
447 | ||
448 | BUG_ON(pdatum->value < 1 || pdatum->value > 32); | |
449 | ||
450 | permission_names[pdatum->value - 1] = (char *)k; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | static void security_dump_masked_av(struct context *scontext, | |
456 | struct context *tcontext, | |
457 | u16 tclass, | |
458 | u32 permissions, | |
459 | const char *reason) | |
460 | { | |
461 | struct common_datum *common_dat; | |
462 | struct class_datum *tclass_dat; | |
463 | struct audit_buffer *ab; | |
464 | char *tclass_name; | |
465 | char *scontext_name = NULL; | |
466 | char *tcontext_name = NULL; | |
467 | char *permission_names[32]; | |
468 | int index, length; | |
469 | bool need_comma = false; | |
470 | ||
471 | if (!permissions) | |
472 | return; | |
473 | ||
474 | tclass_name = policydb.p_class_val_to_name[tclass - 1]; | |
475 | tclass_dat = policydb.class_val_to_struct[tclass - 1]; | |
476 | common_dat = tclass_dat->comdatum; | |
477 | ||
478 | /* init permission_names */ | |
479 | if (common_dat && | |
480 | hashtab_map(common_dat->permissions.table, | |
481 | dump_masked_av_helper, permission_names) < 0) | |
482 | goto out; | |
483 | ||
484 | if (hashtab_map(tclass_dat->permissions.table, | |
485 | dump_masked_av_helper, permission_names) < 0) | |
486 | goto out; | |
487 | ||
488 | /* get scontext/tcontext in text form */ | |
489 | if (context_struct_to_string(scontext, | |
490 | &scontext_name, &length) < 0) | |
491 | goto out; | |
492 | ||
493 | if (context_struct_to_string(tcontext, | |
494 | &tcontext_name, &length) < 0) | |
495 | goto out; | |
496 | ||
497 | /* audit a message */ | |
498 | ab = audit_log_start(current->audit_context, | |
499 | GFP_ATOMIC, AUDIT_SELINUX_ERR); | |
500 | if (!ab) | |
501 | goto out; | |
502 | ||
503 | audit_log_format(ab, "op=security_compute_av reason=%s " | |
504 | "scontext=%s tcontext=%s tclass=%s perms=", | |
505 | reason, scontext_name, tcontext_name, tclass_name); | |
506 | ||
507 | for (index = 0; index < 32; index++) { | |
508 | u32 mask = (1 << index); | |
509 | ||
510 | if ((mask & permissions) == 0) | |
511 | continue; | |
512 | ||
513 | audit_log_format(ab, "%s%s", | |
514 | need_comma ? "," : "", | |
515 | permission_names[index] | |
516 | ? permission_names[index] : "????"); | |
517 | need_comma = true; | |
518 | } | |
519 | audit_log_end(ab); | |
520 | out: | |
521 | /* release scontext/tcontext */ | |
522 | kfree(tcontext_name); | |
523 | kfree(scontext_name); | |
524 | ||
525 | return; | |
526 | } | |
527 | ||
d9250dea KK |
528 | /* |
529 | * security_boundary_permission - drops violated permissions | |
530 | * on boundary constraint. | |
531 | */ | |
532 | static void type_attribute_bounds_av(struct context *scontext, | |
533 | struct context *tcontext, | |
534 | u16 tclass, | |
535 | u32 requested, | |
536 | struct av_decision *avd) | |
537 | { | |
538 | struct context lo_scontext; | |
539 | struct context lo_tcontext; | |
540 | struct av_decision lo_avd; | |
541 | struct type_datum *source | |
542 | = policydb.type_val_to_struct[scontext->type - 1]; | |
543 | struct type_datum *target | |
544 | = policydb.type_val_to_struct[tcontext->type - 1]; | |
545 | u32 masked = 0; | |
546 | ||
547 | if (source->bounds) { | |
548 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
549 | ||
550 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); | |
551 | lo_scontext.type = source->bounds; | |
552 | ||
553 | context_struct_compute_av(&lo_scontext, | |
554 | tcontext, | |
555 | tclass, | |
556 | requested, | |
557 | &lo_avd); | |
558 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
559 | return; /* no masked permission */ | |
560 | masked = ~lo_avd.allowed & avd->allowed; | |
561 | } | |
562 | ||
563 | if (target->bounds) { | |
564 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
565 | ||
566 | memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); | |
567 | lo_tcontext.type = target->bounds; | |
568 | ||
569 | context_struct_compute_av(scontext, | |
570 | &lo_tcontext, | |
571 | tclass, | |
572 | requested, | |
573 | &lo_avd); | |
574 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
575 | return; /* no masked permission */ | |
576 | masked = ~lo_avd.allowed & avd->allowed; | |
577 | } | |
578 | ||
579 | if (source->bounds && target->bounds) { | |
580 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
581 | /* | |
582 | * lo_scontext and lo_tcontext are already | |
583 | * set up. | |
584 | */ | |
585 | ||
586 | context_struct_compute_av(&lo_scontext, | |
587 | &lo_tcontext, | |
588 | tclass, | |
589 | requested, | |
590 | &lo_avd); | |
591 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
592 | return; /* no masked permission */ | |
593 | masked = ~lo_avd.allowed & avd->allowed; | |
594 | } | |
595 | ||
596 | if (masked) { | |
d9250dea KK |
597 | /* mask violated permissions */ |
598 | avd->allowed &= ~masked; | |
599 | ||
44c2d9bd KK |
600 | /* audit masked permissions */ |
601 | security_dump_masked_av(scontext, tcontext, | |
602 | tclass, masked, "bounds"); | |
d9250dea KK |
603 | } |
604 | } | |
605 | ||
1da177e4 LT |
606 | /* |
607 | * Compute access vectors based on a context structure pair for | |
608 | * the permissions in a particular class. | |
609 | */ | |
610 | static int context_struct_compute_av(struct context *scontext, | |
611 | struct context *tcontext, | |
612 | u16 tclass, | |
613 | u32 requested, | |
614 | struct av_decision *avd) | |
615 | { | |
616 | struct constraint_node *constraint; | |
617 | struct role_allow *ra; | |
618 | struct avtab_key avkey; | |
782ebb99 | 619 | struct avtab_node *node; |
1da177e4 | 620 | struct class_datum *tclass_datum; |
782ebb99 SS |
621 | struct ebitmap *sattr, *tattr; |
622 | struct ebitmap_node *snode, *tnode; | |
623 | unsigned int i, j; | |
1da177e4 | 624 | |
1da177e4 LT |
625 | /* |
626 | * Initialize the access vectors to the default values. | |
627 | */ | |
628 | avd->allowed = 0; | |
1da177e4 LT |
629 | avd->auditallow = 0; |
630 | avd->auditdeny = 0xffffffff; | |
631 | avd->seqno = latest_granting; | |
8a6f83af | 632 | avd->flags = 0; |
1da177e4 | 633 | |
c6d3aaa4 SS |
634 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { |
635 | if (printk_ratelimit()) | |
636 | printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass); | |
637 | return -EINVAL; | |
638 | } | |
3f12070e EP |
639 | |
640 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
641 | ||
1da177e4 LT |
642 | /* |
643 | * If a specific type enforcement rule was defined for | |
644 | * this permission check, then use it. | |
645 | */ | |
1da177e4 | 646 | avkey.target_class = tclass; |
782ebb99 SS |
647 | avkey.specified = AVTAB_AV; |
648 | sattr = &policydb.type_attr_map[scontext->type - 1]; | |
649 | tattr = &policydb.type_attr_map[tcontext->type - 1]; | |
9fe79ad1 KK |
650 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
651 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
652 | avkey.source_type = i + 1; |
653 | avkey.target_type = j + 1; | |
654 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
dbc74c65 | 655 | node; |
782ebb99 SS |
656 | node = avtab_search_node_next(node, avkey.specified)) { |
657 | if (node->key.specified == AVTAB_ALLOWED) | |
658 | avd->allowed |= node->datum.data; | |
659 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
660 | avd->auditallow |= node->datum.data; | |
661 | else if (node->key.specified == AVTAB_AUDITDENY) | |
662 | avd->auditdeny &= node->datum.data; | |
663 | } | |
1da177e4 | 664 | |
782ebb99 SS |
665 | /* Check conditional av table for additional permissions */ |
666 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
667 | ||
668 | } | |
669 | } | |
1da177e4 LT |
670 | |
671 | /* | |
672 | * Remove any permissions prohibited by a constraint (this includes | |
673 | * the MLS policy). | |
674 | */ | |
675 | constraint = tclass_datum->constraints; | |
676 | while (constraint) { | |
677 | if ((constraint->permissions & (avd->allowed)) && | |
678 | !constraint_expr_eval(scontext, tcontext, NULL, | |
679 | constraint->expr)) { | |
caabbdc0 | 680 | avd->allowed &= ~(constraint->permissions); |
1da177e4 LT |
681 | } |
682 | constraint = constraint->next; | |
683 | } | |
684 | ||
685 | /* | |
686 | * If checking process transition permission and the | |
687 | * role is changing, then check the (current_role, new_role) | |
688 | * pair. | |
689 | */ | |
c6d3aaa4 SS |
690 | if (tclass == policydb.process_class && |
691 | (avd->allowed & policydb.process_trans_perms) && | |
1da177e4 LT |
692 | scontext->role != tcontext->role) { |
693 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
694 | if (scontext->role == ra->role && | |
695 | tcontext->role == ra->new_role) | |
696 | break; | |
697 | } | |
698 | if (!ra) | |
c6d3aaa4 | 699 | avd->allowed &= ~policydb.process_trans_perms; |
1da177e4 LT |
700 | } |
701 | ||
d9250dea KK |
702 | /* |
703 | * If the given source and target types have boundary | |
704 | * constraint, lazy checks have to mask any violated | |
705 | * permission and notice it to userspace via audit. | |
706 | */ | |
707 | type_attribute_bounds_av(scontext, tcontext, | |
708 | tclass, requested, avd); | |
709 | ||
1da177e4 LT |
710 | return 0; |
711 | } | |
712 | ||
713 | static int security_validtrans_handle_fail(struct context *ocontext, | |
5d55a345 EP |
714 | struct context *ncontext, |
715 | struct context *tcontext, | |
716 | u16 tclass) | |
1da177e4 LT |
717 | { |
718 | char *o = NULL, *n = NULL, *t = NULL; | |
719 | u32 olen, nlen, tlen; | |
720 | ||
721 | if (context_struct_to_string(ocontext, &o, &olen) < 0) | |
722 | goto out; | |
723 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) | |
724 | goto out; | |
725 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
726 | goto out; | |
9ad9ad38 | 727 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
5d55a345 EP |
728 | "security_validate_transition: denied for" |
729 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
730 | o, n, t, policydb.p_class_val_to_name[tclass-1]); | |
1da177e4 LT |
731 | out: |
732 | kfree(o); | |
733 | kfree(n); | |
734 | kfree(t); | |
735 | ||
736 | if (!selinux_enforcing) | |
737 | return 0; | |
738 | return -EPERM; | |
739 | } | |
740 | ||
741 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
c6d3aaa4 | 742 | u16 orig_tclass) |
1da177e4 LT |
743 | { |
744 | struct context *ocontext; | |
745 | struct context *ncontext; | |
746 | struct context *tcontext; | |
747 | struct class_datum *tclass_datum; | |
748 | struct constraint_node *constraint; | |
c6d3aaa4 | 749 | u16 tclass; |
1da177e4 LT |
750 | int rc = 0; |
751 | ||
752 | if (!ss_initialized) | |
753 | return 0; | |
754 | ||
0804d113 | 755 | read_lock(&policy_rwlock); |
1da177e4 | 756 | |
c6d3aaa4 SS |
757 | tclass = unmap_class(orig_tclass); |
758 | ||
1da177e4 | 759 | if (!tclass || tclass > policydb.p_classes.nprim) { |
744ba35e EP |
760 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", |
761 | __func__, tclass); | |
1da177e4 LT |
762 | rc = -EINVAL; |
763 | goto out; | |
764 | } | |
765 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
766 | ||
767 | ocontext = sidtab_search(&sidtab, oldsid); | |
768 | if (!ocontext) { | |
744ba35e EP |
769 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
770 | __func__, oldsid); | |
1da177e4 LT |
771 | rc = -EINVAL; |
772 | goto out; | |
773 | } | |
774 | ||
775 | ncontext = sidtab_search(&sidtab, newsid); | |
776 | if (!ncontext) { | |
744ba35e EP |
777 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
778 | __func__, newsid); | |
1da177e4 LT |
779 | rc = -EINVAL; |
780 | goto out; | |
781 | } | |
782 | ||
783 | tcontext = sidtab_search(&sidtab, tasksid); | |
784 | if (!tcontext) { | |
744ba35e EP |
785 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
786 | __func__, tasksid); | |
1da177e4 LT |
787 | rc = -EINVAL; |
788 | goto out; | |
789 | } | |
790 | ||
791 | constraint = tclass_datum->validatetrans; | |
792 | while (constraint) { | |
793 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 794 | constraint->expr)) { |
1da177e4 | 795 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
5d55a345 | 796 | tcontext, tclass); |
1da177e4 LT |
797 | goto out; |
798 | } | |
799 | constraint = constraint->next; | |
800 | } | |
801 | ||
802 | out: | |
0804d113 | 803 | read_unlock(&policy_rwlock); |
1da177e4 LT |
804 | return rc; |
805 | } | |
806 | ||
d9250dea KK |
807 | /* |
808 | * security_bounded_transition - check whether the given | |
809 | * transition is directed to bounded, or not. | |
810 | * It returns 0, if @newsid is bounded by @oldsid. | |
811 | * Otherwise, it returns error code. | |
812 | * | |
813 | * @oldsid : current security identifier | |
814 | * @newsid : destinated security identifier | |
815 | */ | |
816 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
817 | { | |
818 | struct context *old_context, *new_context; | |
819 | struct type_datum *type; | |
820 | int index; | |
821 | int rc = -EINVAL; | |
822 | ||
823 | read_lock(&policy_rwlock); | |
824 | ||
825 | old_context = sidtab_search(&sidtab, old_sid); | |
826 | if (!old_context) { | |
827 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
828 | __func__, old_sid); | |
829 | goto out; | |
830 | } | |
831 | ||
832 | new_context = sidtab_search(&sidtab, new_sid); | |
833 | if (!new_context) { | |
834 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
835 | __func__, new_sid); | |
836 | goto out; | |
837 | } | |
838 | ||
839 | /* type/domain unchaned */ | |
840 | if (old_context->type == new_context->type) { | |
841 | rc = 0; | |
842 | goto out; | |
843 | } | |
844 | ||
845 | index = new_context->type; | |
846 | while (true) { | |
847 | type = policydb.type_val_to_struct[index - 1]; | |
848 | BUG_ON(!type); | |
849 | ||
850 | /* not bounded anymore */ | |
851 | if (!type->bounds) { | |
852 | rc = -EPERM; | |
853 | break; | |
854 | } | |
855 | ||
856 | /* @newsid is bounded by @oldsid */ | |
857 | if (type->bounds == old_context->type) { | |
858 | rc = 0; | |
859 | break; | |
860 | } | |
861 | index = type->bounds; | |
862 | } | |
44c2d9bd KK |
863 | |
864 | if (rc) { | |
865 | char *old_name = NULL; | |
866 | char *new_name = NULL; | |
867 | int length; | |
868 | ||
869 | if (!context_struct_to_string(old_context, | |
870 | &old_name, &length) && | |
871 | !context_struct_to_string(new_context, | |
872 | &new_name, &length)) { | |
873 | audit_log(current->audit_context, | |
874 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
875 | "op=security_bounded_transition " | |
876 | "result=denied " | |
877 | "oldcontext=%s newcontext=%s", | |
878 | old_name, new_name); | |
879 | } | |
880 | kfree(new_name); | |
881 | kfree(old_name); | |
882 | } | |
d9250dea KK |
883 | out: |
884 | read_unlock(&policy_rwlock); | |
885 | ||
886 | return rc; | |
887 | } | |
888 | ||
889 | ||
c6d3aaa4 SS |
890 | static int security_compute_av_core(u32 ssid, |
891 | u32 tsid, | |
892 | u16 tclass, | |
893 | u32 requested, | |
894 | struct av_decision *avd) | |
895 | { | |
896 | struct context *scontext = NULL, *tcontext = NULL; | |
897 | int rc = 0; | |
898 | ||
899 | scontext = sidtab_search(&sidtab, ssid); | |
900 | if (!scontext) { | |
901 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
902 | __func__, ssid); | |
903 | return -EINVAL; | |
904 | } | |
905 | tcontext = sidtab_search(&sidtab, tsid); | |
906 | if (!tcontext) { | |
907 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
908 | __func__, tsid); | |
909 | return -EINVAL; | |
910 | } | |
911 | ||
912 | rc = context_struct_compute_av(scontext, tcontext, tclass, | |
913 | requested, avd); | |
914 | ||
915 | /* permissive domain? */ | |
916 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
917 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
918 | ||
919 | return rc; | |
920 | } | |
921 | ||
1da177e4 LT |
922 | /** |
923 | * security_compute_av - Compute access vector decisions. | |
924 | * @ssid: source security identifier | |
925 | * @tsid: target security identifier | |
926 | * @tclass: target security class | |
927 | * @requested: requested permissions | |
928 | * @avd: access vector decisions | |
929 | * | |
930 | * Compute a set of access vector decisions based on the | |
931 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
932 | * Return -%EINVAL if any of the parameters are invalid or %0 | |
933 | * if the access vector decisions were computed successfully. | |
934 | */ | |
935 | int security_compute_av(u32 ssid, | |
936 | u32 tsid, | |
c6d3aaa4 SS |
937 | u16 orig_tclass, |
938 | u32 orig_requested, | |
1da177e4 LT |
939 | struct av_decision *avd) |
940 | { | |
c6d3aaa4 SS |
941 | u16 tclass; |
942 | u32 requested; | |
943 | int rc; | |
944 | ||
b7f3008a SS |
945 | read_lock(&policy_rwlock); |
946 | ||
c6d3aaa4 SS |
947 | if (!ss_initialized) |
948 | goto allow; | |
949 | ||
c6d3aaa4 SS |
950 | requested = unmap_perm(orig_tclass, orig_requested); |
951 | tclass = unmap_class(orig_tclass); | |
952 | if (unlikely(orig_tclass && !tclass)) { | |
953 | if (policydb.allow_unknown) | |
954 | goto allow; | |
b7f3008a SS |
955 | rc = -EINVAL; |
956 | goto out; | |
c6d3aaa4 SS |
957 | } |
958 | rc = security_compute_av_core(ssid, tsid, tclass, requested, avd); | |
959 | map_decision(orig_tclass, avd, policydb.allow_unknown); | |
b7f3008a | 960 | out: |
c6d3aaa4 SS |
961 | read_unlock(&policy_rwlock); |
962 | return rc; | |
963 | allow: | |
964 | avd->allowed = 0xffffffff; | |
965 | avd->auditallow = 0; | |
966 | avd->auditdeny = 0xffffffff; | |
967 | avd->seqno = latest_granting; | |
968 | avd->flags = 0; | |
b7f3008a SS |
969 | rc = 0; |
970 | goto out; | |
c6d3aaa4 SS |
971 | } |
972 | ||
973 | int security_compute_av_user(u32 ssid, | |
974 | u32 tsid, | |
975 | u16 tclass, | |
976 | u32 requested, | |
977 | struct av_decision *avd) | |
978 | { | |
979 | int rc; | |
1da177e4 LT |
980 | |
981 | if (!ss_initialized) { | |
4c443d1b | 982 | avd->allowed = 0xffffffff; |
1da177e4 LT |
983 | avd->auditallow = 0; |
984 | avd->auditdeny = 0xffffffff; | |
985 | avd->seqno = latest_granting; | |
986 | return 0; | |
987 | } | |
988 | ||
0804d113 | 989 | read_lock(&policy_rwlock); |
c6d3aaa4 | 990 | rc = security_compute_av_core(ssid, tsid, tclass, requested, avd); |
0804d113 | 991 | read_unlock(&policy_rwlock); |
1da177e4 LT |
992 | return rc; |
993 | } | |
994 | ||
995 | /* | |
996 | * Write the security context string representation of | |
997 | * the context structure `context' into a dynamically | |
998 | * allocated string of the correct size. Set `*scontext' | |
999 | * to point to this string and set `*scontext_len' to | |
1000 | * the length of the string. | |
1001 | */ | |
1002 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
1003 | { | |
1004 | char *scontextp; | |
1005 | ||
1006 | *scontext = NULL; | |
1007 | *scontext_len = 0; | |
1008 | ||
12b29f34 SS |
1009 | if (context->len) { |
1010 | *scontext_len = context->len; | |
1011 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
1012 | if (!(*scontext)) | |
1013 | return -ENOMEM; | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1da177e4 LT |
1017 | /* Compute the size of the context. */ |
1018 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; | |
1019 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; | |
1020 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; | |
1021 | *scontext_len += mls_compute_context_len(context); | |
1022 | ||
1023 | /* Allocate space for the context; caller must free this space. */ | |
1024 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 1025 | if (!scontextp) |
1da177e4 | 1026 | return -ENOMEM; |
1da177e4 LT |
1027 | *scontext = scontextp; |
1028 | ||
1029 | /* | |
1030 | * Copy the user name, role name and type name into the context. | |
1031 | */ | |
1032 | sprintf(scontextp, "%s:%s:%s", | |
1033 | policydb.p_user_val_to_name[context->user - 1], | |
1034 | policydb.p_role_val_to_name[context->role - 1], | |
1035 | policydb.p_type_val_to_name[context->type - 1]); | |
1036 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + | |
5d55a345 EP |
1037 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + |
1038 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); | |
1da177e4 LT |
1039 | |
1040 | mls_sid_to_context(context, &scontextp); | |
1041 | ||
1042 | *scontextp = 0; | |
1043 | ||
1044 | return 0; | |
1045 | } | |
1046 | ||
1047 | #include "initial_sid_to_string.h" | |
1048 | ||
f0ee2e46 JC |
1049 | const char *security_get_initial_sid_context(u32 sid) |
1050 | { | |
1051 | if (unlikely(sid > SECINITSID_NUM)) | |
1052 | return NULL; | |
1053 | return initial_sid_to_string[sid]; | |
1054 | } | |
1055 | ||
12b29f34 SS |
1056 | static int security_sid_to_context_core(u32 sid, char **scontext, |
1057 | u32 *scontext_len, int force) | |
1da177e4 LT |
1058 | { |
1059 | struct context *context; | |
1060 | int rc = 0; | |
1061 | ||
4f4acf3a SS |
1062 | *scontext = NULL; |
1063 | *scontext_len = 0; | |
1064 | ||
1da177e4 LT |
1065 | if (!ss_initialized) { |
1066 | if (sid <= SECINITSID_NUM) { | |
1067 | char *scontextp; | |
1068 | ||
1069 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
5d55a345 | 1070 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
0cccca06 SH |
1071 | if (!scontextp) { |
1072 | rc = -ENOMEM; | |
1073 | goto out; | |
1074 | } | |
1da177e4 LT |
1075 | strcpy(scontextp, initial_sid_to_string[sid]); |
1076 | *scontext = scontextp; | |
1077 | goto out; | |
1078 | } | |
744ba35e EP |
1079 | printk(KERN_ERR "SELinux: %s: called before initial " |
1080 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
1081 | rc = -EINVAL; |
1082 | goto out; | |
1083 | } | |
0804d113 | 1084 | read_lock(&policy_rwlock); |
12b29f34 SS |
1085 | if (force) |
1086 | context = sidtab_search_force(&sidtab, sid); | |
1087 | else | |
1088 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 1089 | if (!context) { |
744ba35e EP |
1090 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1091 | __func__, sid); | |
1da177e4 LT |
1092 | rc = -EINVAL; |
1093 | goto out_unlock; | |
1094 | } | |
1095 | rc = context_struct_to_string(context, scontext, scontext_len); | |
1096 | out_unlock: | |
0804d113 | 1097 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1098 | out: |
1099 | return rc; | |
1100 | ||
1101 | } | |
1102 | ||
12b29f34 SS |
1103 | /** |
1104 | * security_sid_to_context - Obtain a context for a given SID. | |
1105 | * @sid: security identifier, SID | |
1106 | * @scontext: security context | |
1107 | * @scontext_len: length in bytes | |
1108 | * | |
1109 | * Write the string representation of the context associated with @sid | |
1110 | * into a dynamically allocated string of the correct size. Set @scontext | |
1111 | * to point to this string and set @scontext_len to the length of the string. | |
1112 | */ | |
1113 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 1114 | { |
12b29f34 SS |
1115 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
1116 | } | |
1117 | ||
1118 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
1119 | { | |
1120 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
1121 | } | |
1122 | ||
9a59daa0 SS |
1123 | /* |
1124 | * Caveat: Mutates scontext. | |
1125 | */ | |
12b29f34 SS |
1126 | static int string_to_context_struct(struct policydb *pol, |
1127 | struct sidtab *sidtabp, | |
9a59daa0 | 1128 | char *scontext, |
12b29f34 SS |
1129 | u32 scontext_len, |
1130 | struct context *ctx, | |
9a59daa0 | 1131 | u32 def_sid) |
12b29f34 | 1132 | { |
1da177e4 LT |
1133 | struct role_datum *role; |
1134 | struct type_datum *typdatum; | |
1135 | struct user_datum *usrdatum; | |
1136 | char *scontextp, *p, oldc; | |
1137 | int rc = 0; | |
1138 | ||
12b29f34 | 1139 | context_init(ctx); |
1da177e4 | 1140 | |
1da177e4 LT |
1141 | /* Parse the security context. */ |
1142 | ||
1143 | rc = -EINVAL; | |
9a59daa0 | 1144 | scontextp = (char *) scontext; |
1da177e4 LT |
1145 | |
1146 | /* Extract the user. */ | |
1147 | p = scontextp; | |
1148 | while (*p && *p != ':') | |
1149 | p++; | |
1150 | ||
1151 | if (*p == 0) | |
12b29f34 | 1152 | goto out; |
1da177e4 LT |
1153 | |
1154 | *p++ = 0; | |
1155 | ||
12b29f34 | 1156 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1157 | if (!usrdatum) |
12b29f34 | 1158 | goto out; |
1da177e4 | 1159 | |
12b29f34 | 1160 | ctx->user = usrdatum->value; |
1da177e4 LT |
1161 | |
1162 | /* Extract role. */ | |
1163 | scontextp = p; | |
1164 | while (*p && *p != ':') | |
1165 | p++; | |
1166 | ||
1167 | if (*p == 0) | |
12b29f34 | 1168 | goto out; |
1da177e4 LT |
1169 | |
1170 | *p++ = 0; | |
1171 | ||
12b29f34 | 1172 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1173 | if (!role) |
12b29f34 SS |
1174 | goto out; |
1175 | ctx->role = role->value; | |
1da177e4 LT |
1176 | |
1177 | /* Extract type. */ | |
1178 | scontextp = p; | |
1179 | while (*p && *p != ':') | |
1180 | p++; | |
1181 | oldc = *p; | |
1182 | *p++ = 0; | |
1183 | ||
12b29f34 | 1184 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1185 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1186 | goto out; |
1da177e4 | 1187 | |
12b29f34 | 1188 | ctx->type = typdatum->value; |
1da177e4 | 1189 | |
12b29f34 | 1190 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 1191 | if (rc) |
12b29f34 | 1192 | goto out; |
1da177e4 | 1193 | |
9a59daa0 | 1194 | if ((p - scontext) < scontext_len) { |
1da177e4 | 1195 | rc = -EINVAL; |
12b29f34 | 1196 | goto out; |
1da177e4 LT |
1197 | } |
1198 | ||
1199 | /* Check the validity of the new context. */ | |
12b29f34 | 1200 | if (!policydb_context_isvalid(pol, ctx)) { |
1da177e4 | 1201 | rc = -EINVAL; |
12b29f34 | 1202 | goto out; |
1da177e4 | 1203 | } |
12b29f34 SS |
1204 | rc = 0; |
1205 | out: | |
8e531af9 EP |
1206 | if (rc) |
1207 | context_destroy(ctx); | |
12b29f34 SS |
1208 | return rc; |
1209 | } | |
1210 | ||
1211 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
1212 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
1213 | int force) | |
1214 | { | |
9a59daa0 | 1215 | char *scontext2, *str = NULL; |
12b29f34 SS |
1216 | struct context context; |
1217 | int rc = 0; | |
1218 | ||
1219 | if (!ss_initialized) { | |
1220 | int i; | |
1221 | ||
1222 | for (i = 1; i < SECINITSID_NUM; i++) { | |
1223 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
1224 | *sid = i; | |
9a59daa0 | 1225 | return 0; |
12b29f34 SS |
1226 | } |
1227 | } | |
1228 | *sid = SECINITSID_KERNEL; | |
9a59daa0 | 1229 | return 0; |
12b29f34 SS |
1230 | } |
1231 | *sid = SECSID_NULL; | |
1232 | ||
9a59daa0 SS |
1233 | /* Copy the string so that we can modify the copy as we parse it. */ |
1234 | scontext2 = kmalloc(scontext_len+1, gfp_flags); | |
1235 | if (!scontext2) | |
1236 | return -ENOMEM; | |
1237 | memcpy(scontext2, scontext, scontext_len); | |
1238 | scontext2[scontext_len] = 0; | |
1239 | ||
1240 | if (force) { | |
1241 | /* Save another copy for storing in uninterpreted form */ | |
1242 | str = kstrdup(scontext2, gfp_flags); | |
1243 | if (!str) { | |
1244 | kfree(scontext2); | |
1245 | return -ENOMEM; | |
1246 | } | |
1247 | } | |
1248 | ||
0804d113 | 1249 | read_lock(&policy_rwlock); |
12b29f34 | 1250 | rc = string_to_context_struct(&policydb, &sidtab, |
9a59daa0 SS |
1251 | scontext2, scontext_len, |
1252 | &context, def_sid); | |
12b29f34 | 1253 | if (rc == -EINVAL && force) { |
9a59daa0 | 1254 | context.str = str; |
12b29f34 | 1255 | context.len = scontext_len; |
9a59daa0 | 1256 | str = NULL; |
12b29f34 SS |
1257 | } else if (rc) |
1258 | goto out; | |
1259 | rc = sidtab_context_to_sid(&sidtab, &context, sid); | |
8e531af9 | 1260 | context_destroy(&context); |
1da177e4 | 1261 | out: |
0804d113 | 1262 | read_unlock(&policy_rwlock); |
9a59daa0 SS |
1263 | kfree(scontext2); |
1264 | kfree(str); | |
1da177e4 LT |
1265 | return rc; |
1266 | } | |
1267 | ||
f5c1d5b2 JM |
1268 | /** |
1269 | * security_context_to_sid - Obtain a SID for a given security context. | |
1270 | * @scontext: security context | |
1271 | * @scontext_len: length in bytes | |
1272 | * @sid: security identifier, SID | |
1273 | * | |
1274 | * Obtains a SID associated with the security context that | |
1275 | * has the string representation specified by @scontext. | |
1276 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1277 | * memory is available, or 0 on success. | |
1278 | */ | |
8f0cfa52 | 1279 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid) |
f5c1d5b2 JM |
1280 | { |
1281 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 | 1282 | sid, SECSID_NULL, GFP_KERNEL, 0); |
f5c1d5b2 JM |
1283 | } |
1284 | ||
1285 | /** | |
1286 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1287 | * falling back to specified default if needed. | |
1288 | * | |
1289 | * @scontext: security context | |
1290 | * @scontext_len: length in bytes | |
1291 | * @sid: security identifier, SID | |
d133a960 | 1292 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1293 | * |
1294 | * Obtains a SID associated with the security context that | |
1295 | * has the string representation specified by @scontext. | |
1296 | * The default SID is passed to the MLS layer to be used to allow | |
1297 | * kernel labeling of the MLS field if the MLS field is not present | |
1298 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1299 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1300 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1301 | * memory is available, or 0 on success. | |
1302 | */ | |
7bf570dc DH |
1303 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1304 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1305 | { |
1306 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1307 | sid, def_sid, gfp_flags, 1); |
1308 | } | |
1309 | ||
1310 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1311 | u32 *sid) | |
1312 | { | |
1313 | return security_context_to_sid_core(scontext, scontext_len, | |
1314 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1315 | } |
1316 | ||
1da177e4 LT |
1317 | static int compute_sid_handle_invalid_context( |
1318 | struct context *scontext, | |
1319 | struct context *tcontext, | |
1320 | u16 tclass, | |
1321 | struct context *newcontext) | |
1322 | { | |
1323 | char *s = NULL, *t = NULL, *n = NULL; | |
1324 | u32 slen, tlen, nlen; | |
1325 | ||
1326 | if (context_struct_to_string(scontext, &s, &slen) < 0) | |
1327 | goto out; | |
1328 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) | |
1329 | goto out; | |
1330 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) | |
1331 | goto out; | |
9ad9ad38 | 1332 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
1333 | "security_compute_sid: invalid context %s" |
1334 | " for scontext=%s" | |
1335 | " tcontext=%s" | |
1336 | " tclass=%s", | |
1337 | n, s, t, policydb.p_class_val_to_name[tclass-1]); | |
1338 | out: | |
1339 | kfree(s); | |
1340 | kfree(t); | |
1341 | kfree(n); | |
1342 | if (!selinux_enforcing) | |
1343 | return 0; | |
1344 | return -EACCES; | |
1345 | } | |
1346 | ||
1347 | static int security_compute_sid(u32 ssid, | |
1348 | u32 tsid, | |
c6d3aaa4 | 1349 | u16 orig_tclass, |
1da177e4 | 1350 | u32 specified, |
c6d3aaa4 SS |
1351 | u32 *out_sid, |
1352 | bool kern) | |
1da177e4 LT |
1353 | { |
1354 | struct context *scontext = NULL, *tcontext = NULL, newcontext; | |
1355 | struct role_trans *roletr = NULL; | |
1356 | struct avtab_key avkey; | |
1357 | struct avtab_datum *avdatum; | |
1358 | struct avtab_node *node; | |
c6d3aaa4 | 1359 | u16 tclass; |
1da177e4 LT |
1360 | int rc = 0; |
1361 | ||
1362 | if (!ss_initialized) { | |
c6d3aaa4 SS |
1363 | switch (orig_tclass) { |
1364 | case SECCLASS_PROCESS: /* kernel value */ | |
1da177e4 LT |
1365 | *out_sid = ssid; |
1366 | break; | |
1367 | default: | |
1368 | *out_sid = tsid; | |
1369 | break; | |
1370 | } | |
1371 | goto out; | |
1372 | } | |
1373 | ||
851f8a69 VY |
1374 | context_init(&newcontext); |
1375 | ||
0804d113 | 1376 | read_lock(&policy_rwlock); |
1da177e4 | 1377 | |
c6d3aaa4 SS |
1378 | if (kern) |
1379 | tclass = unmap_class(orig_tclass); | |
1380 | else | |
1381 | tclass = orig_tclass; | |
1382 | ||
1da177e4 LT |
1383 | scontext = sidtab_search(&sidtab, ssid); |
1384 | if (!scontext) { | |
744ba35e EP |
1385 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1386 | __func__, ssid); | |
1da177e4 LT |
1387 | rc = -EINVAL; |
1388 | goto out_unlock; | |
1389 | } | |
1390 | tcontext = sidtab_search(&sidtab, tsid); | |
1391 | if (!tcontext) { | |
744ba35e EP |
1392 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1393 | __func__, tsid); | |
1da177e4 LT |
1394 | rc = -EINVAL; |
1395 | goto out_unlock; | |
1396 | } | |
1397 | ||
1da177e4 LT |
1398 | /* Set the user identity. */ |
1399 | switch (specified) { | |
1400 | case AVTAB_TRANSITION: | |
1401 | case AVTAB_CHANGE: | |
1402 | /* Use the process user identity. */ | |
1403 | newcontext.user = scontext->user; | |
1404 | break; | |
1405 | case AVTAB_MEMBER: | |
1406 | /* Use the related object owner. */ | |
1407 | newcontext.user = tcontext->user; | |
1408 | break; | |
1409 | } | |
1410 | ||
1411 | /* Set the role and type to default values. */ | |
c6d3aaa4 | 1412 | if (tclass == policydb.process_class) { |
1da177e4 LT |
1413 | /* Use the current role and type of process. */ |
1414 | newcontext.role = scontext->role; | |
1415 | newcontext.type = scontext->type; | |
c6d3aaa4 | 1416 | } else { |
1da177e4 LT |
1417 | /* Use the well-defined object role. */ |
1418 | newcontext.role = OBJECT_R_VAL; | |
1419 | /* Use the type of the related object. */ | |
1420 | newcontext.type = tcontext->type; | |
1421 | } | |
1422 | ||
1423 | /* Look for a type transition/member/change rule. */ | |
1424 | avkey.source_type = scontext->type; | |
1425 | avkey.target_type = tcontext->type; | |
1426 | avkey.target_class = tclass; | |
782ebb99 SS |
1427 | avkey.specified = specified; |
1428 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1429 | |
1430 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1431 | if (!avdatum) { |
782ebb99 | 1432 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1433 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1434 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1435 | avdatum = &node->datum; |
1436 | break; | |
1437 | } | |
1438 | } | |
1439 | } | |
1440 | ||
782ebb99 | 1441 | if (avdatum) { |
1da177e4 | 1442 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 1443 | newcontext.type = avdatum->data; |
1da177e4 LT |
1444 | } |
1445 | ||
1446 | /* Check for class-specific changes. */ | |
c6d3aaa4 | 1447 | if (tclass == policydb.process_class) { |
1da177e4 LT |
1448 | if (specified & AVTAB_TRANSITION) { |
1449 | /* Look for a role transition rule. */ | |
1450 | for (roletr = policydb.role_tr; roletr; | |
1451 | roletr = roletr->next) { | |
1452 | if (roletr->role == scontext->role && | |
1453 | roletr->type == tcontext->type) { | |
1454 | /* Use the role transition rule. */ | |
1455 | newcontext.role = roletr->new_role; | |
1456 | break; | |
1457 | } | |
1458 | } | |
1459 | } | |
1da177e4 LT |
1460 | } |
1461 | ||
1462 | /* Set the MLS attributes. | |
1463 | This is done last because it may allocate memory. */ | |
1464 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); | |
1465 | if (rc) | |
1466 | goto out_unlock; | |
1467 | ||
1468 | /* Check the validity of the context. */ | |
1469 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1470 | rc = compute_sid_handle_invalid_context(scontext, | |
1471 | tcontext, | |
1472 | tclass, | |
1473 | &newcontext); | |
1474 | if (rc) | |
1475 | goto out_unlock; | |
1476 | } | |
1477 | /* Obtain the sid for the context. */ | |
1478 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1479 | out_unlock: | |
0804d113 | 1480 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1481 | context_destroy(&newcontext); |
1482 | out: | |
1483 | return rc; | |
1484 | } | |
1485 | ||
1486 | /** | |
1487 | * security_transition_sid - Compute the SID for a new subject/object. | |
1488 | * @ssid: source security identifier | |
1489 | * @tsid: target security identifier | |
1490 | * @tclass: target security class | |
1491 | * @out_sid: security identifier for new subject/object | |
1492 | * | |
1493 | * Compute a SID to use for labeling a new subject or object in the | |
1494 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1495 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1496 | * if insufficient memory is available, or %0 if the new SID was | |
1497 | * computed successfully. | |
1498 | */ | |
1499 | int security_transition_sid(u32 ssid, | |
1500 | u32 tsid, | |
1501 | u16 tclass, | |
1502 | u32 *out_sid) | |
1503 | { | |
c6d3aaa4 SS |
1504 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, |
1505 | out_sid, true); | |
1506 | } | |
1507 | ||
1508 | int security_transition_sid_user(u32 ssid, | |
1509 | u32 tsid, | |
1510 | u16 tclass, | |
1511 | u32 *out_sid) | |
1512 | { | |
1513 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, | |
1514 | out_sid, false); | |
1da177e4 LT |
1515 | } |
1516 | ||
1517 | /** | |
1518 | * security_member_sid - Compute the SID for member selection. | |
1519 | * @ssid: source security identifier | |
1520 | * @tsid: target security identifier | |
1521 | * @tclass: target security class | |
1522 | * @out_sid: security identifier for selected member | |
1523 | * | |
1524 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1525 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1526 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1527 | * if insufficient memory is available, or %0 if the SID was | |
1528 | * computed successfully. | |
1529 | */ | |
1530 | int security_member_sid(u32 ssid, | |
1531 | u32 tsid, | |
1532 | u16 tclass, | |
1533 | u32 *out_sid) | |
1534 | { | |
c6d3aaa4 SS |
1535 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid, |
1536 | false); | |
1da177e4 LT |
1537 | } |
1538 | ||
1539 | /** | |
1540 | * security_change_sid - Compute the SID for object relabeling. | |
1541 | * @ssid: source security identifier | |
1542 | * @tsid: target security identifier | |
1543 | * @tclass: target security class | |
1544 | * @out_sid: security identifier for selected member | |
1545 | * | |
1546 | * Compute a SID to use for relabeling an object of class @tclass | |
1547 | * based on a SID pair (@ssid, @tsid). | |
1548 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1549 | * if insufficient memory is available, or %0 if the SID was | |
1550 | * computed successfully. | |
1551 | */ | |
1552 | int security_change_sid(u32 ssid, | |
1553 | u32 tsid, | |
1554 | u16 tclass, | |
1555 | u32 *out_sid) | |
1556 | { | |
c6d3aaa4 SS |
1557 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid, |
1558 | false); | |
b94c7e67 CS |
1559 | } |
1560 | ||
1da177e4 LT |
1561 | /* Clone the SID into the new SID table. */ |
1562 | static int clone_sid(u32 sid, | |
1563 | struct context *context, | |
1564 | void *arg) | |
1565 | { | |
1566 | struct sidtab *s = arg; | |
1567 | ||
1568 | return sidtab_insert(s, sid, context); | |
1569 | } | |
1570 | ||
1571 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1572 | { | |
1573 | int rc = 0; | |
1574 | ||
1575 | if (selinux_enforcing) { | |
1576 | rc = -EINVAL; | |
1577 | } else { | |
1578 | char *s; | |
1579 | u32 len; | |
1580 | ||
12b29f34 SS |
1581 | if (!context_struct_to_string(context, &s, &len)) { |
1582 | printk(KERN_WARNING | |
1583 | "SELinux: Context %s would be invalid if enforcing\n", | |
1584 | s); | |
1585 | kfree(s); | |
1586 | } | |
1da177e4 LT |
1587 | } |
1588 | return rc; | |
1589 | } | |
1590 | ||
1591 | struct convert_context_args { | |
1592 | struct policydb *oldp; | |
1593 | struct policydb *newp; | |
1594 | }; | |
1595 | ||
1596 | /* | |
1597 | * Convert the values in the security context | |
1598 | * structure `c' from the values specified | |
1599 | * in the policy `p->oldp' to the values specified | |
1600 | * in the policy `p->newp'. Verify that the | |
1601 | * context is valid under the new policy. | |
1602 | */ | |
1603 | static int convert_context(u32 key, | |
1604 | struct context *c, | |
1605 | void *p) | |
1606 | { | |
1607 | struct convert_context_args *args; | |
1608 | struct context oldc; | |
1609 | struct role_datum *role; | |
1610 | struct type_datum *typdatum; | |
1611 | struct user_datum *usrdatum; | |
1612 | char *s; | |
1613 | u32 len; | |
1614 | int rc; | |
1615 | ||
1616 | args = p; | |
1617 | ||
12b29f34 SS |
1618 | if (c->str) { |
1619 | struct context ctx; | |
9a59daa0 SS |
1620 | s = kstrdup(c->str, GFP_KERNEL); |
1621 | if (!s) { | |
1622 | rc = -ENOMEM; | |
1623 | goto out; | |
1624 | } | |
1625 | rc = string_to_context_struct(args->newp, NULL, s, | |
1626 | c->len, &ctx, SECSID_NULL); | |
1627 | kfree(s); | |
12b29f34 SS |
1628 | if (!rc) { |
1629 | printk(KERN_INFO | |
1630 | "SELinux: Context %s became valid (mapped).\n", | |
1631 | c->str); | |
1632 | /* Replace string with mapped representation. */ | |
1633 | kfree(c->str); | |
1634 | memcpy(c, &ctx, sizeof(*c)); | |
1635 | goto out; | |
1636 | } else if (rc == -EINVAL) { | |
1637 | /* Retain string representation for later mapping. */ | |
1638 | rc = 0; | |
1639 | goto out; | |
1640 | } else { | |
1641 | /* Other error condition, e.g. ENOMEM. */ | |
1642 | printk(KERN_ERR | |
1643 | "SELinux: Unable to map context %s, rc = %d.\n", | |
1644 | c->str, -rc); | |
1645 | goto out; | |
1646 | } | |
1647 | } | |
1648 | ||
1da177e4 LT |
1649 | rc = context_cpy(&oldc, c); |
1650 | if (rc) | |
1651 | goto out; | |
1652 | ||
1653 | rc = -EINVAL; | |
1654 | ||
1655 | /* Convert the user. */ | |
1656 | usrdatum = hashtab_search(args->newp->p_users.table, | |
5d55a345 EP |
1657 | args->oldp->p_user_val_to_name[c->user - 1]); |
1658 | if (!usrdatum) | |
1da177e4 | 1659 | goto bad; |
1da177e4 LT |
1660 | c->user = usrdatum->value; |
1661 | ||
1662 | /* Convert the role. */ | |
1663 | role = hashtab_search(args->newp->p_roles.table, | |
5d55a345 EP |
1664 | args->oldp->p_role_val_to_name[c->role - 1]); |
1665 | if (!role) | |
1da177e4 | 1666 | goto bad; |
1da177e4 LT |
1667 | c->role = role->value; |
1668 | ||
1669 | /* Convert the type. */ | |
1670 | typdatum = hashtab_search(args->newp->p_types.table, | |
5d55a345 EP |
1671 | args->oldp->p_type_val_to_name[c->type - 1]); |
1672 | if (!typdatum) | |
1da177e4 | 1673 | goto bad; |
1da177e4 LT |
1674 | c->type = typdatum->value; |
1675 | ||
1676 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1677 | if (rc) | |
1678 | goto bad; | |
1679 | ||
1680 | /* Check the validity of the new context. */ | |
1681 | if (!policydb_context_isvalid(args->newp, c)) { | |
1682 | rc = convert_context_handle_invalid_context(&oldc); | |
1683 | if (rc) | |
1684 | goto bad; | |
1685 | } | |
1686 | ||
1687 | context_destroy(&oldc); | |
12b29f34 | 1688 | rc = 0; |
1da177e4 LT |
1689 | out: |
1690 | return rc; | |
1691 | bad: | |
12b29f34 SS |
1692 | /* Map old representation to string and save it. */ |
1693 | if (context_struct_to_string(&oldc, &s, &len)) | |
1694 | return -ENOMEM; | |
1da177e4 | 1695 | context_destroy(&oldc); |
12b29f34 SS |
1696 | context_destroy(c); |
1697 | c->str = s; | |
1698 | c->len = len; | |
1699 | printk(KERN_INFO | |
1700 | "SELinux: Context %s became invalid (unmapped).\n", | |
1701 | c->str); | |
1702 | rc = 0; | |
1da177e4 LT |
1703 | goto out; |
1704 | } | |
1705 | ||
3bb56b25 PM |
1706 | static void security_load_policycaps(void) |
1707 | { | |
1708 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1709 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1710 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1711 | POLICYDB_CAPABILITY_OPENPERM); | |
3bb56b25 PM |
1712 | } |
1713 | ||
1da177e4 | 1714 | extern void selinux_complete_init(void); |
e900a7d9 | 1715 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1716 | |
1717 | /** | |
1718 | * security_load_policy - Load a security policy configuration. | |
1719 | * @data: binary policy data | |
1720 | * @len: length of data in bytes | |
1721 | * | |
1722 | * Load a new set of security policy configuration data, | |
1723 | * validate it and convert the SID table as necessary. | |
1724 | * This function will flush the access vector cache after | |
1725 | * loading the new policy. | |
1726 | */ | |
1727 | int security_load_policy(void *data, size_t len) | |
1728 | { | |
1729 | struct policydb oldpolicydb, newpolicydb; | |
1730 | struct sidtab oldsidtab, newsidtab; | |
c6d3aaa4 | 1731 | struct selinux_mapping *oldmap, *map = NULL; |
1da177e4 LT |
1732 | struct convert_context_args args; |
1733 | u32 seqno; | |
c6d3aaa4 | 1734 | u16 map_size; |
1da177e4 LT |
1735 | int rc = 0; |
1736 | struct policy_file file = { data, len }, *fp = &file; | |
1737 | ||
1da177e4 LT |
1738 | if (!ss_initialized) { |
1739 | avtab_cache_init(); | |
1740 | if (policydb_read(&policydb, fp)) { | |
1da177e4 LT |
1741 | avtab_cache_destroy(); |
1742 | return -EINVAL; | |
1743 | } | |
c6d3aaa4 SS |
1744 | if (selinux_set_mapping(&policydb, secclass_map, |
1745 | ¤t_mapping, | |
1746 | ¤t_mapping_size)) { | |
1da177e4 LT |
1747 | policydb_destroy(&policydb); |
1748 | avtab_cache_destroy(); | |
1749 | return -EINVAL; | |
1750 | } | |
c6d3aaa4 | 1751 | if (policydb_load_isids(&policydb, &sidtab)) { |
b94c7e67 CS |
1752 | policydb_destroy(&policydb); |
1753 | avtab_cache_destroy(); | |
1754 | return -EINVAL; | |
1755 | } | |
3bb56b25 | 1756 | security_load_policycaps(); |
1da177e4 | 1757 | ss_initialized = 1; |
4c443d1b | 1758 | seqno = ++latest_granting; |
1da177e4 | 1759 | selinux_complete_init(); |
4c443d1b SS |
1760 | avc_ss_reset(seqno); |
1761 | selnl_notify_policyload(seqno); | |
7420ed23 | 1762 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1763 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1764 | return 0; |
1765 | } | |
1766 | ||
1767 | #if 0 | |
1768 | sidtab_hash_eval(&sidtab, "sids"); | |
1769 | #endif | |
1770 | ||
89abd0ac | 1771 | if (policydb_read(&newpolicydb, fp)) |
1da177e4 | 1772 | return -EINVAL; |
1da177e4 | 1773 | |
12b29f34 | 1774 | if (sidtab_init(&newsidtab)) { |
12b29f34 SS |
1775 | policydb_destroy(&newpolicydb); |
1776 | return -ENOMEM; | |
1777 | } | |
1da177e4 | 1778 | |
c6d3aaa4 SS |
1779 | if (selinux_set_mapping(&newpolicydb, secclass_map, |
1780 | &map, &map_size)) | |
b94c7e67 | 1781 | goto err; |
b94c7e67 | 1782 | |
e900a7d9 SS |
1783 | rc = security_preserve_bools(&newpolicydb); |
1784 | if (rc) { | |
454d972c | 1785 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
1786 | goto err; |
1787 | } | |
1788 | ||
1da177e4 LT |
1789 | /* Clone the SID table. */ |
1790 | sidtab_shutdown(&sidtab); | |
1791 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { | |
1792 | rc = -ENOMEM; | |
1793 | goto err; | |
1794 | } | |
1795 | ||
12b29f34 SS |
1796 | /* |
1797 | * Convert the internal representations of contexts | |
1798 | * in the new SID table. | |
1799 | */ | |
1da177e4 LT |
1800 | args.oldp = &policydb; |
1801 | args.newp = &newpolicydb; | |
12b29f34 SS |
1802 | rc = sidtab_map(&newsidtab, convert_context, &args); |
1803 | if (rc) | |
1804 | goto err; | |
1da177e4 LT |
1805 | |
1806 | /* Save the old policydb and SID table to free later. */ | |
1807 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1808 | sidtab_set(&oldsidtab, &sidtab); | |
1809 | ||
1810 | /* Install the new policydb and SID table. */ | |
0804d113 | 1811 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
1812 | memcpy(&policydb, &newpolicydb, sizeof policydb); |
1813 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1814 | security_load_policycaps(); |
c6d3aaa4 SS |
1815 | oldmap = current_mapping; |
1816 | current_mapping = map; | |
1817 | current_mapping_size = map_size; | |
1da177e4 | 1818 | seqno = ++latest_granting; |
0804d113 | 1819 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
1820 | |
1821 | /* Free the old policydb and SID table. */ | |
1822 | policydb_destroy(&oldpolicydb); | |
1823 | sidtab_destroy(&oldsidtab); | |
c6d3aaa4 | 1824 | kfree(oldmap); |
1da177e4 LT |
1825 | |
1826 | avc_ss_reset(seqno); | |
1827 | selnl_notify_policyload(seqno); | |
7420ed23 | 1828 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1829 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1830 | |
1831 | return 0; | |
1832 | ||
1833 | err: | |
c6d3aaa4 | 1834 | kfree(map); |
1da177e4 LT |
1835 | sidtab_destroy(&newsidtab); |
1836 | policydb_destroy(&newpolicydb); | |
1837 | return rc; | |
1838 | ||
1839 | } | |
1840 | ||
1841 | /** | |
1842 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
1843 | * @protocol: protocol number |
1844 | * @port: port number | |
1845 | * @out_sid: security identifier | |
1846 | */ | |
3e112172 | 1847 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
1848 | { |
1849 | struct ocontext *c; | |
1850 | int rc = 0; | |
1851 | ||
0804d113 | 1852 | read_lock(&policy_rwlock); |
1da177e4 LT |
1853 | |
1854 | c = policydb.ocontexts[OCON_PORT]; | |
1855 | while (c) { | |
1856 | if (c->u.port.protocol == protocol && | |
1857 | c->u.port.low_port <= port && | |
1858 | c->u.port.high_port >= port) | |
1859 | break; | |
1860 | c = c->next; | |
1861 | } | |
1862 | ||
1863 | if (c) { | |
1864 | if (!c->sid[0]) { | |
1865 | rc = sidtab_context_to_sid(&sidtab, | |
1866 | &c->context[0], | |
1867 | &c->sid[0]); | |
1868 | if (rc) | |
1869 | goto out; | |
1870 | } | |
1871 | *out_sid = c->sid[0]; | |
1872 | } else { | |
1873 | *out_sid = SECINITSID_PORT; | |
1874 | } | |
1875 | ||
1876 | out: | |
0804d113 | 1877 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1878 | return rc; |
1879 | } | |
1880 | ||
1881 | /** | |
1882 | * security_netif_sid - Obtain the SID for a network interface. | |
1883 | * @name: interface name | |
1884 | * @if_sid: interface SID | |
1da177e4 | 1885 | */ |
e8bfdb9d | 1886 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
1887 | { |
1888 | int rc = 0; | |
1889 | struct ocontext *c; | |
1890 | ||
0804d113 | 1891 | read_lock(&policy_rwlock); |
1da177e4 LT |
1892 | |
1893 | c = policydb.ocontexts[OCON_NETIF]; | |
1894 | while (c) { | |
1895 | if (strcmp(name, c->u.name) == 0) | |
1896 | break; | |
1897 | c = c->next; | |
1898 | } | |
1899 | ||
1900 | if (c) { | |
1901 | if (!c->sid[0] || !c->sid[1]) { | |
1902 | rc = sidtab_context_to_sid(&sidtab, | |
1903 | &c->context[0], | |
1904 | &c->sid[0]); | |
1905 | if (rc) | |
1906 | goto out; | |
1907 | rc = sidtab_context_to_sid(&sidtab, | |
1908 | &c->context[1], | |
1909 | &c->sid[1]); | |
1910 | if (rc) | |
1911 | goto out; | |
1912 | } | |
1913 | *if_sid = c->sid[0]; | |
e8bfdb9d | 1914 | } else |
1da177e4 | 1915 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
1916 | |
1917 | out: | |
0804d113 | 1918 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1919 | return rc; |
1920 | } | |
1921 | ||
1922 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
1923 | { | |
1924 | int i, fail = 0; | |
1925 | ||
5d55a345 EP |
1926 | for (i = 0; i < 4; i++) |
1927 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
1928 | fail = 1; |
1929 | break; | |
1930 | } | |
1931 | ||
1932 | return !fail; | |
1933 | } | |
1934 | ||
1935 | /** | |
1936 | * security_node_sid - Obtain the SID for a node (host). | |
1937 | * @domain: communication domain aka address family | |
1938 | * @addrp: address | |
1939 | * @addrlen: address length in bytes | |
1940 | * @out_sid: security identifier | |
1941 | */ | |
1942 | int security_node_sid(u16 domain, | |
1943 | void *addrp, | |
1944 | u32 addrlen, | |
1945 | u32 *out_sid) | |
1946 | { | |
1947 | int rc = 0; | |
1948 | struct ocontext *c; | |
1949 | ||
0804d113 | 1950 | read_lock(&policy_rwlock); |
1da177e4 LT |
1951 | |
1952 | switch (domain) { | |
1953 | case AF_INET: { | |
1954 | u32 addr; | |
1955 | ||
1956 | if (addrlen != sizeof(u32)) { | |
1957 | rc = -EINVAL; | |
1958 | goto out; | |
1959 | } | |
1960 | ||
1961 | addr = *((u32 *)addrp); | |
1962 | ||
1963 | c = policydb.ocontexts[OCON_NODE]; | |
1964 | while (c) { | |
1965 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
1966 | break; | |
1967 | c = c->next; | |
1968 | } | |
1969 | break; | |
1970 | } | |
1971 | ||
1972 | case AF_INET6: | |
1973 | if (addrlen != sizeof(u64) * 2) { | |
1974 | rc = -EINVAL; | |
1975 | goto out; | |
1976 | } | |
1977 | c = policydb.ocontexts[OCON_NODE6]; | |
1978 | while (c) { | |
1979 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
1980 | c->u.node6.mask)) | |
1981 | break; | |
1982 | c = c->next; | |
1983 | } | |
1984 | break; | |
1985 | ||
1986 | default: | |
1987 | *out_sid = SECINITSID_NODE; | |
1988 | goto out; | |
1989 | } | |
1990 | ||
1991 | if (c) { | |
1992 | if (!c->sid[0]) { | |
1993 | rc = sidtab_context_to_sid(&sidtab, | |
1994 | &c->context[0], | |
1995 | &c->sid[0]); | |
1996 | if (rc) | |
1997 | goto out; | |
1998 | } | |
1999 | *out_sid = c->sid[0]; | |
2000 | } else { | |
2001 | *out_sid = SECINITSID_NODE; | |
2002 | } | |
2003 | ||
2004 | out: | |
0804d113 | 2005 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2006 | return rc; |
2007 | } | |
2008 | ||
2009 | #define SIDS_NEL 25 | |
2010 | ||
2011 | /** | |
2012 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
2013 | * @fromsid: starting SID | |
2014 | * @username: username | |
2015 | * @sids: array of reachable SIDs for user | |
2016 | * @nel: number of elements in @sids | |
2017 | * | |
2018 | * Generate the set of SIDs for legal security contexts | |
2019 | * for a given user that can be reached by @fromsid. | |
2020 | * Set *@sids to point to a dynamically allocated | |
2021 | * array containing the set of SIDs. Set *@nel to the | |
2022 | * number of elements in the array. | |
2023 | */ | |
2024 | ||
2025 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 2026 | char *username, |
1da177e4 LT |
2027 | u32 **sids, |
2028 | u32 *nel) | |
2029 | { | |
2030 | struct context *fromcon, usercon; | |
2c3c05db | 2031 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
2032 | u32 mynel = 0, maxnel = SIDS_NEL; |
2033 | struct user_datum *user; | |
2034 | struct role_datum *role; | |
782ebb99 | 2035 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
2036 | int rc = 0, i, j; |
2037 | ||
2c3c05db SS |
2038 | *sids = NULL; |
2039 | *nel = 0; | |
2040 | ||
2041 | if (!ss_initialized) | |
1da177e4 | 2042 | goto out; |
1da177e4 | 2043 | |
0804d113 | 2044 | read_lock(&policy_rwlock); |
1da177e4 | 2045 | |
12b29f34 SS |
2046 | context_init(&usercon); |
2047 | ||
1da177e4 LT |
2048 | fromcon = sidtab_search(&sidtab, fromsid); |
2049 | if (!fromcon) { | |
2050 | rc = -EINVAL; | |
2051 | goto out_unlock; | |
2052 | } | |
2053 | ||
2054 | user = hashtab_search(policydb.p_users.table, username); | |
2055 | if (!user) { | |
2056 | rc = -EINVAL; | |
2057 | goto out_unlock; | |
2058 | } | |
2059 | usercon.user = user->value; | |
2060 | ||
89d155ef | 2061 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
1da177e4 LT |
2062 | if (!mysids) { |
2063 | rc = -ENOMEM; | |
2064 | goto out_unlock; | |
2065 | } | |
1da177e4 | 2066 | |
9fe79ad1 | 2067 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 LT |
2068 | role = policydb.role_val_to_struct[i]; |
2069 | usercon.role = i+1; | |
9fe79ad1 | 2070 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
1da177e4 LT |
2071 | usercon.type = j+1; |
2072 | ||
2073 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
2074 | continue; | |
2075 | ||
1da177e4 | 2076 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 2077 | if (rc) |
1da177e4 | 2078 | goto out_unlock; |
1da177e4 LT |
2079 | if (mynel < maxnel) { |
2080 | mysids[mynel++] = sid; | |
2081 | } else { | |
2082 | maxnel += SIDS_NEL; | |
89d155ef | 2083 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
1da177e4 LT |
2084 | if (!mysids2) { |
2085 | rc = -ENOMEM; | |
1da177e4 LT |
2086 | goto out_unlock; |
2087 | } | |
1da177e4 LT |
2088 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2089 | kfree(mysids); | |
2090 | mysids = mysids2; | |
2091 | mysids[mynel++] = sid; | |
2092 | } | |
2093 | } | |
2094 | } | |
2095 | ||
1da177e4 | 2096 | out_unlock: |
0804d113 | 2097 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2098 | if (rc || !mynel) { |
2099 | kfree(mysids); | |
2100 | goto out; | |
2101 | } | |
2102 | ||
2103 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); | |
2104 | if (!mysids2) { | |
2105 | rc = -ENOMEM; | |
2106 | kfree(mysids); | |
2107 | goto out; | |
2108 | } | |
2109 | for (i = 0, j = 0; i < mynel; i++) { | |
2110 | rc = avc_has_perm_noaudit(fromsid, mysids[i], | |
c6d3aaa4 | 2111 | SECCLASS_PROCESS, /* kernel value */ |
2c3c05db SS |
2112 | PROCESS__TRANSITION, AVC_STRICT, |
2113 | NULL); | |
2114 | if (!rc) | |
2115 | mysids2[j++] = mysids[i]; | |
2116 | cond_resched(); | |
2117 | } | |
2118 | rc = 0; | |
2119 | kfree(mysids); | |
2120 | *sids = mysids2; | |
2121 | *nel = j; | |
1da177e4 LT |
2122 | out: |
2123 | return rc; | |
2124 | } | |
2125 | ||
2126 | /** | |
2127 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2128 | * @fstype: filesystem type | |
2129 | * @path: path from root of mount | |
2130 | * @sclass: file security class | |
2131 | * @sid: SID for path | |
2132 | * | |
2133 | * Obtain a SID to use for a file in a filesystem that | |
2134 | * cannot support xattr or use a fixed labeling behavior like | |
2135 | * transition SIDs or task SIDs. | |
2136 | */ | |
2137 | int security_genfs_sid(const char *fstype, | |
5d55a345 | 2138 | char *path, |
c6d3aaa4 | 2139 | u16 orig_sclass, |
1da177e4 LT |
2140 | u32 *sid) |
2141 | { | |
2142 | int len; | |
c6d3aaa4 | 2143 | u16 sclass; |
1da177e4 LT |
2144 | struct genfs *genfs; |
2145 | struct ocontext *c; | |
2146 | int rc = 0, cmp = 0; | |
2147 | ||
b1aa5301 SS |
2148 | while (path[0] == '/' && path[1] == '/') |
2149 | path++; | |
2150 | ||
0804d113 | 2151 | read_lock(&policy_rwlock); |
1da177e4 | 2152 | |
c6d3aaa4 SS |
2153 | sclass = unmap_class(orig_sclass); |
2154 | ||
1da177e4 LT |
2155 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { |
2156 | cmp = strcmp(fstype, genfs->fstype); | |
2157 | if (cmp <= 0) | |
2158 | break; | |
2159 | } | |
2160 | ||
2161 | if (!genfs || cmp) { | |
2162 | *sid = SECINITSID_UNLABELED; | |
2163 | rc = -ENOENT; | |
2164 | goto out; | |
2165 | } | |
2166 | ||
2167 | for (c = genfs->head; c; c = c->next) { | |
2168 | len = strlen(c->u.name); | |
2169 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2170 | (strncmp(c->u.name, path, len) == 0)) | |
2171 | break; | |
2172 | } | |
2173 | ||
2174 | if (!c) { | |
2175 | *sid = SECINITSID_UNLABELED; | |
2176 | rc = -ENOENT; | |
2177 | goto out; | |
2178 | } | |
2179 | ||
2180 | if (!c->sid[0]) { | |
2181 | rc = sidtab_context_to_sid(&sidtab, | |
2182 | &c->context[0], | |
2183 | &c->sid[0]); | |
2184 | if (rc) | |
2185 | goto out; | |
2186 | } | |
2187 | ||
2188 | *sid = c->sid[0]; | |
2189 | out: | |
0804d113 | 2190 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2191 | return rc; |
2192 | } | |
2193 | ||
2194 | /** | |
2195 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
2196 | * @fstype: filesystem type | |
2197 | * @behavior: labeling behavior | |
2198 | * @sid: SID for filesystem (superblock) | |
2199 | */ | |
2200 | int security_fs_use( | |
2201 | const char *fstype, | |
2202 | unsigned int *behavior, | |
089be43e | 2203 | u32 *sid) |
1da177e4 LT |
2204 | { |
2205 | int rc = 0; | |
2206 | struct ocontext *c; | |
2207 | ||
0804d113 | 2208 | read_lock(&policy_rwlock); |
1da177e4 LT |
2209 | |
2210 | c = policydb.ocontexts[OCON_FSUSE]; | |
2211 | while (c) { | |
2212 | if (strcmp(fstype, c->u.name) == 0) | |
2213 | break; | |
2214 | c = c->next; | |
2215 | } | |
2216 | ||
2217 | if (c) { | |
2218 | *behavior = c->v.behavior; | |
2219 | if (!c->sid[0]) { | |
2220 | rc = sidtab_context_to_sid(&sidtab, | |
2221 | &c->context[0], | |
2222 | &c->sid[0]); | |
2223 | if (rc) | |
2224 | goto out; | |
2225 | } | |
2226 | *sid = c->sid[0]; | |
2227 | } else { | |
089be43e JM |
2228 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); |
2229 | if (rc) { | |
2230 | *behavior = SECURITY_FS_USE_NONE; | |
2231 | rc = 0; | |
2232 | } else { | |
2233 | *behavior = SECURITY_FS_USE_GENFS; | |
2234 | } | |
1da177e4 LT |
2235 | } |
2236 | ||
2237 | out: | |
0804d113 | 2238 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2239 | return rc; |
2240 | } | |
2241 | ||
2242 | int security_get_bools(int *len, char ***names, int **values) | |
2243 | { | |
2244 | int i, rc = -ENOMEM; | |
2245 | ||
0804d113 | 2246 | read_lock(&policy_rwlock); |
1da177e4 LT |
2247 | *names = NULL; |
2248 | *values = NULL; | |
2249 | ||
2250 | *len = policydb.p_bools.nprim; | |
2251 | if (!*len) { | |
2252 | rc = 0; | |
2253 | goto out; | |
2254 | } | |
2255 | ||
5d55a345 | 2256 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); |
1da177e4 LT |
2257 | if (!*names) |
2258 | goto err; | |
1da177e4 | 2259 | |
e0795cf4 | 2260 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
1da177e4 LT |
2261 | if (!*values) |
2262 | goto err; | |
2263 | ||
2264 | for (i = 0; i < *len; i++) { | |
2265 | size_t name_len; | |
2266 | (*values)[i] = policydb.bool_val_to_struct[i]->state; | |
2267 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; | |
5d55a345 | 2268 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
1da177e4 LT |
2269 | if (!(*names)[i]) |
2270 | goto err; | |
2271 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); | |
2272 | (*names)[i][name_len - 1] = 0; | |
2273 | } | |
2274 | rc = 0; | |
2275 | out: | |
0804d113 | 2276 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2277 | return rc; |
2278 | err: | |
2279 | if (*names) { | |
2280 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2281 | kfree((*names)[i]); |
1da177e4 | 2282 | } |
9a5f04bf | 2283 | kfree(*values); |
1da177e4 LT |
2284 | goto out; |
2285 | } | |
2286 | ||
2287 | ||
2288 | int security_set_bools(int len, int *values) | |
2289 | { | |
2290 | int i, rc = 0; | |
2291 | int lenp, seqno = 0; | |
2292 | struct cond_node *cur; | |
2293 | ||
0804d113 | 2294 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
2295 | |
2296 | lenp = policydb.p_bools.nprim; | |
2297 | if (len != lenp) { | |
2298 | rc = -EFAULT; | |
2299 | goto out; | |
2300 | } | |
2301 | ||
1da177e4 | 2302 | for (i = 0; i < len; i++) { |
af601e46 SG |
2303 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2304 | audit_log(current->audit_context, GFP_ATOMIC, | |
2305 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2306 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
af601e46 SG |
2307 | policydb.p_bool_val_to_name[i], |
2308 | !!values[i], | |
2309 | policydb.bool_val_to_struct[i]->state, | |
4746ec5b EP |
2310 | audit_get_loginuid(current), |
2311 | audit_get_sessionid(current)); | |
af601e46 | 2312 | } |
5d55a345 | 2313 | if (values[i]) |
1da177e4 | 2314 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2315 | else |
1da177e4 | 2316 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2317 | } |
1da177e4 | 2318 | |
dbc74c65 | 2319 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2320 | rc = evaluate_cond_node(&policydb, cur); |
2321 | if (rc) | |
2322 | goto out; | |
2323 | } | |
2324 | ||
2325 | seqno = ++latest_granting; | |
2326 | ||
2327 | out: | |
0804d113 | 2328 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2329 | if (!rc) { |
2330 | avc_ss_reset(seqno); | |
2331 | selnl_notify_policyload(seqno); | |
342a0cff | 2332 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2333 | } |
2334 | return rc; | |
2335 | } | |
2336 | ||
2337 | int security_get_bool_value(int bool) | |
2338 | { | |
2339 | int rc = 0; | |
2340 | int len; | |
2341 | ||
0804d113 | 2342 | read_lock(&policy_rwlock); |
1da177e4 LT |
2343 | |
2344 | len = policydb.p_bools.nprim; | |
2345 | if (bool >= len) { | |
2346 | rc = -EFAULT; | |
2347 | goto out; | |
2348 | } | |
2349 | ||
2350 | rc = policydb.bool_val_to_struct[bool]->state; | |
2351 | out: | |
0804d113 | 2352 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2353 | return rc; |
2354 | } | |
376bd9cb | 2355 | |
e900a7d9 SS |
2356 | static int security_preserve_bools(struct policydb *p) |
2357 | { | |
2358 | int rc, nbools = 0, *bvalues = NULL, i; | |
2359 | char **bnames = NULL; | |
2360 | struct cond_bool_datum *booldatum; | |
2361 | struct cond_node *cur; | |
2362 | ||
2363 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2364 | if (rc) | |
2365 | goto out; | |
2366 | for (i = 0; i < nbools; i++) { | |
2367 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2368 | if (booldatum) | |
2369 | booldatum->state = bvalues[i]; | |
2370 | } | |
dbc74c65 | 2371 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2372 | rc = evaluate_cond_node(p, cur); |
2373 | if (rc) | |
2374 | goto out; | |
2375 | } | |
2376 | ||
2377 | out: | |
2378 | if (bnames) { | |
2379 | for (i = 0; i < nbools; i++) | |
2380 | kfree(bnames[i]); | |
2381 | } | |
2382 | kfree(bnames); | |
2383 | kfree(bvalues); | |
2384 | return rc; | |
2385 | } | |
2386 | ||
08554d6b VY |
2387 | /* |
2388 | * security_sid_mls_copy() - computes a new sid based on the given | |
2389 | * sid and the mls portion of mls_sid. | |
2390 | */ | |
2391 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2392 | { | |
2393 | struct context *context1; | |
2394 | struct context *context2; | |
2395 | struct context newcon; | |
2396 | char *s; | |
2397 | u32 len; | |
2398 | int rc = 0; | |
2399 | ||
4eb327b5 | 2400 | if (!ss_initialized || !selinux_mls_enabled) { |
08554d6b VY |
2401 | *new_sid = sid; |
2402 | goto out; | |
2403 | } | |
2404 | ||
2405 | context_init(&newcon); | |
2406 | ||
0804d113 | 2407 | read_lock(&policy_rwlock); |
08554d6b VY |
2408 | context1 = sidtab_search(&sidtab, sid); |
2409 | if (!context1) { | |
744ba35e EP |
2410 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2411 | __func__, sid); | |
08554d6b VY |
2412 | rc = -EINVAL; |
2413 | goto out_unlock; | |
2414 | } | |
2415 | ||
2416 | context2 = sidtab_search(&sidtab, mls_sid); | |
2417 | if (!context2) { | |
744ba35e EP |
2418 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2419 | __func__, mls_sid); | |
08554d6b VY |
2420 | rc = -EINVAL; |
2421 | goto out_unlock; | |
2422 | } | |
2423 | ||
2424 | newcon.user = context1->user; | |
2425 | newcon.role = context1->role; | |
2426 | newcon.type = context1->type; | |
0efc61ea | 2427 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2428 | if (rc) |
2429 | goto out_unlock; | |
2430 | ||
08554d6b VY |
2431 | /* Check the validity of the new context. */ |
2432 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2433 | rc = convert_context_handle_invalid_context(&newcon); | |
2434 | if (rc) | |
2435 | goto bad; | |
2436 | } | |
2437 | ||
2438 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
2439 | goto out_unlock; | |
2440 | ||
2441 | bad: | |
2442 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2443 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2444 | "security_sid_mls_copy: invalid context %s", s); | |
2445 | kfree(s); | |
2446 | } | |
2447 | ||
2448 | out_unlock: | |
0804d113 | 2449 | read_unlock(&policy_rwlock); |
08554d6b VY |
2450 | context_destroy(&newcon); |
2451 | out: | |
2452 | return rc; | |
2453 | } | |
2454 | ||
220deb96 PM |
2455 | /** |
2456 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2457 | * @nlbl_sid: NetLabel SID | |
2458 | * @nlbl_type: NetLabel labeling protocol type | |
2459 | * @xfrm_sid: XFRM SID | |
2460 | * | |
2461 | * Description: | |
2462 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2463 | * resolved into a single SID it is returned via @peer_sid and the function | |
2464 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2465 | * returns a negative value. A table summarizing the behavior is below: | |
2466 | * | |
2467 | * | function return | @sid | |
2468 | * ------------------------------+-----------------+----------------- | |
2469 | * no peer labels | 0 | SECSID_NULL | |
2470 | * single peer label | 0 | <peer_label> | |
2471 | * multiple, consistent labels | 0 | <peer_label> | |
2472 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2473 | * | |
2474 | */ | |
2475 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2476 | u32 xfrm_sid, | |
2477 | u32 *peer_sid) | |
2478 | { | |
2479 | int rc; | |
2480 | struct context *nlbl_ctx; | |
2481 | struct context *xfrm_ctx; | |
2482 | ||
2483 | /* handle the common (which also happens to be the set of easy) cases | |
2484 | * right away, these two if statements catch everything involving a | |
2485 | * single or absent peer SID/label */ | |
2486 | if (xfrm_sid == SECSID_NULL) { | |
2487 | *peer_sid = nlbl_sid; | |
2488 | return 0; | |
2489 | } | |
2490 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2491 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2492 | * is present */ | |
2493 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2494 | *peer_sid = xfrm_sid; | |
2495 | return 0; | |
2496 | } | |
2497 | ||
2498 | /* we don't need to check ss_initialized here since the only way both | |
2499 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2500 | * security server was initialized and ss_initialized was true */ | |
2501 | if (!selinux_mls_enabled) { | |
2502 | *peer_sid = SECSID_NULL; | |
2503 | return 0; | |
2504 | } | |
2505 | ||
0804d113 | 2506 | read_lock(&policy_rwlock); |
220deb96 PM |
2507 | |
2508 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); | |
2509 | if (!nlbl_ctx) { | |
744ba35e EP |
2510 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2511 | __func__, nlbl_sid); | |
220deb96 PM |
2512 | rc = -EINVAL; |
2513 | goto out_slowpath; | |
2514 | } | |
2515 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); | |
2516 | if (!xfrm_ctx) { | |
744ba35e EP |
2517 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2518 | __func__, xfrm_sid); | |
220deb96 PM |
2519 | rc = -EINVAL; |
2520 | goto out_slowpath; | |
2521 | } | |
2522 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
2523 | ||
2524 | out_slowpath: | |
0804d113 | 2525 | read_unlock(&policy_rwlock); |
220deb96 PM |
2526 | if (rc == 0) |
2527 | /* at present NetLabel SIDs/labels really only carry MLS | |
2528 | * information so if the MLS portion of the NetLabel SID | |
2529 | * matches the MLS portion of the labeled XFRM SID/label | |
2530 | * then pass along the XFRM SID as it is the most | |
2531 | * expressive */ | |
2532 | *peer_sid = xfrm_sid; | |
2533 | else | |
2534 | *peer_sid = SECSID_NULL; | |
2535 | return rc; | |
2536 | } | |
2537 | ||
55fcf09b CP |
2538 | static int get_classes_callback(void *k, void *d, void *args) |
2539 | { | |
2540 | struct class_datum *datum = d; | |
2541 | char *name = k, **classes = args; | |
2542 | int value = datum->value - 1; | |
2543 | ||
2544 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2545 | if (!classes[value]) | |
2546 | return -ENOMEM; | |
2547 | ||
2548 | return 0; | |
2549 | } | |
2550 | ||
2551 | int security_get_classes(char ***classes, int *nclasses) | |
2552 | { | |
2553 | int rc = -ENOMEM; | |
2554 | ||
0804d113 | 2555 | read_lock(&policy_rwlock); |
55fcf09b CP |
2556 | |
2557 | *nclasses = policydb.p_classes.nprim; | |
2558 | *classes = kcalloc(*nclasses, sizeof(*classes), GFP_ATOMIC); | |
2559 | if (!*classes) | |
2560 | goto out; | |
2561 | ||
2562 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2563 | *classes); | |
2564 | if (rc < 0) { | |
2565 | int i; | |
2566 | for (i = 0; i < *nclasses; i++) | |
2567 | kfree((*classes)[i]); | |
2568 | kfree(*classes); | |
2569 | } | |
2570 | ||
2571 | out: | |
0804d113 | 2572 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2573 | return rc; |
2574 | } | |
2575 | ||
2576 | static int get_permissions_callback(void *k, void *d, void *args) | |
2577 | { | |
2578 | struct perm_datum *datum = d; | |
2579 | char *name = k, **perms = args; | |
2580 | int value = datum->value - 1; | |
2581 | ||
2582 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2583 | if (!perms[value]) | |
2584 | return -ENOMEM; | |
2585 | ||
2586 | return 0; | |
2587 | } | |
2588 | ||
2589 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2590 | { | |
2591 | int rc = -ENOMEM, i; | |
2592 | struct class_datum *match; | |
2593 | ||
0804d113 | 2594 | read_lock(&policy_rwlock); |
55fcf09b CP |
2595 | |
2596 | match = hashtab_search(policydb.p_classes.table, class); | |
2597 | if (!match) { | |
744ba35e | 2598 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2599 | __func__, class); |
55fcf09b CP |
2600 | rc = -EINVAL; |
2601 | goto out; | |
2602 | } | |
2603 | ||
2604 | *nperms = match->permissions.nprim; | |
2605 | *perms = kcalloc(*nperms, sizeof(*perms), GFP_ATOMIC); | |
2606 | if (!*perms) | |
2607 | goto out; | |
2608 | ||
2609 | if (match->comdatum) { | |
2610 | rc = hashtab_map(match->comdatum->permissions.table, | |
2611 | get_permissions_callback, *perms); | |
2612 | if (rc < 0) | |
2613 | goto err; | |
2614 | } | |
2615 | ||
2616 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2617 | *perms); | |
2618 | if (rc < 0) | |
2619 | goto err; | |
2620 | ||
2621 | out: | |
0804d113 | 2622 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2623 | return rc; |
2624 | ||
2625 | err: | |
0804d113 | 2626 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2627 | for (i = 0; i < *nperms; i++) |
2628 | kfree((*perms)[i]); | |
2629 | kfree(*perms); | |
2630 | return rc; | |
2631 | } | |
2632 | ||
3f12070e EP |
2633 | int security_get_reject_unknown(void) |
2634 | { | |
2635 | return policydb.reject_unknown; | |
2636 | } | |
2637 | ||
2638 | int security_get_allow_unknown(void) | |
2639 | { | |
2640 | return policydb.allow_unknown; | |
2641 | } | |
2642 | ||
3bb56b25 PM |
2643 | /** |
2644 | * security_policycap_supported - Check for a specific policy capability | |
2645 | * @req_cap: capability | |
2646 | * | |
2647 | * Description: | |
2648 | * This function queries the currently loaded policy to see if it supports the | |
2649 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2650 | * supported, false (0) if it isn't supported. | |
2651 | * | |
2652 | */ | |
2653 | int security_policycap_supported(unsigned int req_cap) | |
2654 | { | |
2655 | int rc; | |
2656 | ||
0804d113 | 2657 | read_lock(&policy_rwlock); |
3bb56b25 | 2658 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 2659 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
2660 | |
2661 | return rc; | |
2662 | } | |
2663 | ||
376bd9cb DG |
2664 | struct selinux_audit_rule { |
2665 | u32 au_seqno; | |
2666 | struct context au_ctxt; | |
2667 | }; | |
2668 | ||
9d57a7f9 | 2669 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 2670 | { |
9d57a7f9 AD |
2671 | struct selinux_audit_rule *rule = vrule; |
2672 | ||
376bd9cb DG |
2673 | if (rule) { |
2674 | context_destroy(&rule->au_ctxt); | |
2675 | kfree(rule); | |
2676 | } | |
2677 | } | |
2678 | ||
9d57a7f9 | 2679 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
2680 | { |
2681 | struct selinux_audit_rule *tmprule; | |
2682 | struct role_datum *roledatum; | |
2683 | struct type_datum *typedatum; | |
2684 | struct user_datum *userdatum; | |
9d57a7f9 | 2685 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
2686 | int rc = 0; |
2687 | ||
2688 | *rule = NULL; | |
2689 | ||
2690 | if (!ss_initialized) | |
3ad40d64 | 2691 | return -EOPNOTSUPP; |
376bd9cb DG |
2692 | |
2693 | switch (field) { | |
3a6b9f85 DG |
2694 | case AUDIT_SUBJ_USER: |
2695 | case AUDIT_SUBJ_ROLE: | |
2696 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2697 | case AUDIT_OBJ_USER: |
2698 | case AUDIT_OBJ_ROLE: | |
2699 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 2700 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 2701 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
2702 | return -EINVAL; |
2703 | break; | |
3a6b9f85 DG |
2704 | case AUDIT_SUBJ_SEN: |
2705 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2706 | case AUDIT_OBJ_LEV_LOW: |
2707 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2708 | /* we do not allow a range, indicated by the presense of '-' */ |
2709 | if (strchr(rulestr, '-')) | |
2710 | return -EINVAL; | |
2711 | break; | |
2712 | default: | |
2713 | /* only the above fields are valid */ | |
2714 | return -EINVAL; | |
2715 | } | |
2716 | ||
2717 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2718 | if (!tmprule) | |
2719 | return -ENOMEM; | |
2720 | ||
2721 | context_init(&tmprule->au_ctxt); | |
2722 | ||
0804d113 | 2723 | read_lock(&policy_rwlock); |
376bd9cb DG |
2724 | |
2725 | tmprule->au_seqno = latest_granting; | |
2726 | ||
2727 | switch (field) { | |
3a6b9f85 | 2728 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2729 | case AUDIT_OBJ_USER: |
376bd9cb DG |
2730 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2731 | if (!userdatum) | |
2732 | rc = -EINVAL; | |
2733 | else | |
2734 | tmprule->au_ctxt.user = userdatum->value; | |
2735 | break; | |
3a6b9f85 | 2736 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2737 | case AUDIT_OBJ_ROLE: |
376bd9cb DG |
2738 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2739 | if (!roledatum) | |
2740 | rc = -EINVAL; | |
2741 | else | |
2742 | tmprule->au_ctxt.role = roledatum->value; | |
2743 | break; | |
3a6b9f85 | 2744 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2745 | case AUDIT_OBJ_TYPE: |
376bd9cb DG |
2746 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2747 | if (!typedatum) | |
2748 | rc = -EINVAL; | |
2749 | else | |
2750 | tmprule->au_ctxt.type = typedatum->value; | |
2751 | break; | |
3a6b9f85 DG |
2752 | case AUDIT_SUBJ_SEN: |
2753 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2754 | case AUDIT_OBJ_LEV_LOW: |
2755 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb DG |
2756 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
2757 | break; | |
2758 | } | |
2759 | ||
0804d113 | 2760 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2761 | |
2762 | if (rc) { | |
2763 | selinux_audit_rule_free(tmprule); | |
2764 | tmprule = NULL; | |
2765 | } | |
2766 | ||
2767 | *rule = tmprule; | |
2768 | ||
2769 | return rc; | |
2770 | } | |
2771 | ||
9d57a7f9 AD |
2772 | /* Check to see if the rule contains any selinux fields */ |
2773 | int selinux_audit_rule_known(struct audit_krule *rule) | |
2774 | { | |
2775 | int i; | |
2776 | ||
2777 | for (i = 0; i < rule->field_count; i++) { | |
2778 | struct audit_field *f = &rule->fields[i]; | |
2779 | switch (f->type) { | |
2780 | case AUDIT_SUBJ_USER: | |
2781 | case AUDIT_SUBJ_ROLE: | |
2782 | case AUDIT_SUBJ_TYPE: | |
2783 | case AUDIT_SUBJ_SEN: | |
2784 | case AUDIT_SUBJ_CLR: | |
2785 | case AUDIT_OBJ_USER: | |
2786 | case AUDIT_OBJ_ROLE: | |
2787 | case AUDIT_OBJ_TYPE: | |
2788 | case AUDIT_OBJ_LEV_LOW: | |
2789 | case AUDIT_OBJ_LEV_HIGH: | |
2790 | return 1; | |
2791 | } | |
2792 | } | |
2793 | ||
2794 | return 0; | |
2795 | } | |
2796 | ||
2797 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 2798 | struct audit_context *actx) |
376bd9cb DG |
2799 | { |
2800 | struct context *ctxt; | |
2801 | struct mls_level *level; | |
9d57a7f9 | 2802 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
2803 | int match = 0; |
2804 | ||
2805 | if (!rule) { | |
2806 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2807 | "selinux_audit_rule_match: missing rule\n"); |
376bd9cb DG |
2808 | return -ENOENT; |
2809 | } | |
2810 | ||
0804d113 | 2811 | read_lock(&policy_rwlock); |
376bd9cb DG |
2812 | |
2813 | if (rule->au_seqno < latest_granting) { | |
2814 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2815 | "selinux_audit_rule_match: stale rule\n"); |
376bd9cb DG |
2816 | match = -ESTALE; |
2817 | goto out; | |
2818 | } | |
2819 | ||
9a2f44f0 | 2820 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2821 | if (!ctxt) { |
2822 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 EP |
2823 | "selinux_audit_rule_match: unrecognized SID %d\n", |
2824 | sid); | |
376bd9cb DG |
2825 | match = -ENOENT; |
2826 | goto out; | |
2827 | } | |
2828 | ||
2829 | /* a field/op pair that is not caught here will simply fall through | |
2830 | without a match */ | |
2831 | switch (field) { | |
3a6b9f85 | 2832 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2833 | case AUDIT_OBJ_USER: |
376bd9cb | 2834 | switch (op) { |
5af75d8d | 2835 | case Audit_equal: |
376bd9cb DG |
2836 | match = (ctxt->user == rule->au_ctxt.user); |
2837 | break; | |
5af75d8d | 2838 | case Audit_not_equal: |
376bd9cb DG |
2839 | match = (ctxt->user != rule->au_ctxt.user); |
2840 | break; | |
2841 | } | |
2842 | break; | |
3a6b9f85 | 2843 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2844 | case AUDIT_OBJ_ROLE: |
376bd9cb | 2845 | switch (op) { |
5af75d8d | 2846 | case Audit_equal: |
376bd9cb DG |
2847 | match = (ctxt->role == rule->au_ctxt.role); |
2848 | break; | |
5af75d8d | 2849 | case Audit_not_equal: |
376bd9cb DG |
2850 | match = (ctxt->role != rule->au_ctxt.role); |
2851 | break; | |
2852 | } | |
2853 | break; | |
3a6b9f85 | 2854 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2855 | case AUDIT_OBJ_TYPE: |
376bd9cb | 2856 | switch (op) { |
5af75d8d | 2857 | case Audit_equal: |
376bd9cb DG |
2858 | match = (ctxt->type == rule->au_ctxt.type); |
2859 | break; | |
5af75d8d | 2860 | case Audit_not_equal: |
376bd9cb DG |
2861 | match = (ctxt->type != rule->au_ctxt.type); |
2862 | break; | |
2863 | } | |
2864 | break; | |
3a6b9f85 DG |
2865 | case AUDIT_SUBJ_SEN: |
2866 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2867 | case AUDIT_OBJ_LEV_LOW: |
2868 | case AUDIT_OBJ_LEV_HIGH: | |
2869 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
2870 | field == AUDIT_OBJ_LEV_LOW) ? |
2871 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 2872 | switch (op) { |
5af75d8d | 2873 | case Audit_equal: |
376bd9cb | 2874 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2875 | level); |
376bd9cb | 2876 | break; |
5af75d8d | 2877 | case Audit_not_equal: |
376bd9cb | 2878 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 2879 | level); |
376bd9cb | 2880 | break; |
5af75d8d | 2881 | case Audit_lt: |
376bd9cb | 2882 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
2883 | level) && |
2884 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
2885 | level)); | |
376bd9cb | 2886 | break; |
5af75d8d | 2887 | case Audit_le: |
376bd9cb | 2888 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 2889 | level); |
376bd9cb | 2890 | break; |
5af75d8d | 2891 | case Audit_gt: |
376bd9cb | 2892 | match = (mls_level_dom(level, |
5d55a345 EP |
2893 | &rule->au_ctxt.range.level[0]) && |
2894 | !mls_level_eq(level, | |
2895 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 2896 | break; |
5af75d8d | 2897 | case Audit_ge: |
376bd9cb | 2898 | match = mls_level_dom(level, |
5d55a345 | 2899 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
2900 | break; |
2901 | } | |
2902 | } | |
2903 | ||
2904 | out: | |
0804d113 | 2905 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2906 | return match; |
2907 | } | |
2908 | ||
9d57a7f9 | 2909 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb DG |
2910 | |
2911 | static int aurule_avc_callback(u32 event, u32 ssid, u32 tsid, | |
f5269710 | 2912 | u16 class, u32 perms, u32 *retained) |
376bd9cb DG |
2913 | { |
2914 | int err = 0; | |
2915 | ||
2916 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
2917 | err = aurule_callback(); | |
2918 | return err; | |
2919 | } | |
2920 | ||
2921 | static int __init aurule_init(void) | |
2922 | { | |
2923 | int err; | |
2924 | ||
2925 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET, | |
5d55a345 | 2926 | SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0); |
376bd9cb DG |
2927 | if (err) |
2928 | panic("avc_add_callback() failed, error %d\n", err); | |
2929 | ||
2930 | return err; | |
2931 | } | |
2932 | __initcall(aurule_init); | |
2933 | ||
7420ed23 | 2934 | #ifdef CONFIG_NETLABEL |
7420ed23 | 2935 | /** |
5778eabd PM |
2936 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
2937 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 2938 | * @sid: the SELinux SID |
7420ed23 VY |
2939 | * |
2940 | * Description: | |
2941 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
2942 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
2943 | * already been initialized. | |
7420ed23 VY |
2944 | * |
2945 | */ | |
5778eabd | 2946 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 2947 | u32 sid) |
7420ed23 | 2948 | { |
5dbe1eb0 | 2949 | u32 *sid_cache; |
7420ed23 | 2950 | |
5dbe1eb0 PM |
2951 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
2952 | if (sid_cache == NULL) | |
5778eabd | 2953 | return; |
5dbe1eb0 PM |
2954 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
2955 | if (secattr->cache == NULL) { | |
2956 | kfree(sid_cache); | |
5778eabd | 2957 | return; |
0ec8abd7 | 2958 | } |
7420ed23 | 2959 | |
5dbe1eb0 PM |
2960 | *sid_cache = sid; |
2961 | secattr->cache->free = kfree; | |
2962 | secattr->cache->data = sid_cache; | |
5778eabd | 2963 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
2964 | } |
2965 | ||
2966 | /** | |
5778eabd | 2967 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 2968 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
2969 | * @sid: the SELinux SID |
2970 | * | |
2971 | * Description: | |
5778eabd | 2972 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 2973 | * SELinux SID. If the @secattr field does not contain a full SELinux |
5dbe1eb0 PM |
2974 | * SID/context then use SECINITSID_NETMSG as the foundation. If possibile the |
2975 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to | |
2976 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
2977 | * conversion for future lookups. Returns zero on success, negative values on | |
2978 | * failure. | |
7420ed23 VY |
2979 | * |
2980 | */ | |
5778eabd | 2981 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 2982 | u32 *sid) |
7420ed23 VY |
2983 | { |
2984 | int rc = -EIDRM; | |
2985 | struct context *ctx; | |
2986 | struct context ctx_new; | |
5778eabd PM |
2987 | |
2988 | if (!ss_initialized) { | |
2989 | *sid = SECSID_NULL; | |
2990 | return 0; | |
2991 | } | |
7420ed23 | 2992 | |
0804d113 | 2993 | read_lock(&policy_rwlock); |
7420ed23 | 2994 | |
701a90ba | 2995 | if (secattr->flags & NETLBL_SECATTR_CACHE) { |
5dbe1eb0 PM |
2996 | *sid = *(u32 *)secattr->cache->data; |
2997 | rc = 0; | |
16efd454 PM |
2998 | } else if (secattr->flags & NETLBL_SECATTR_SECID) { |
2999 | *sid = secattr->attr.secid; | |
3000 | rc = 0; | |
701a90ba | 3001 | } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
5dbe1eb0 | 3002 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 VY |
3003 | if (ctx == NULL) |
3004 | goto netlbl_secattr_to_sid_return; | |
3005 | ||
81990fbd | 3006 | context_init(&ctx_new); |
7420ed23 VY |
3007 | ctx_new.user = ctx->user; |
3008 | ctx_new.role = ctx->role; | |
3009 | ctx_new.type = ctx->type; | |
02752760 | 3010 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 3011 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
02752760 | 3012 | if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
16efd454 | 3013 | secattr->attr.mls.cat) != 0) |
7420ed23 | 3014 | goto netlbl_secattr_to_sid_return; |
81990fbd PM |
3015 | memcpy(&ctx_new.range.level[1].cat, |
3016 | &ctx_new.range.level[0].cat, | |
3017 | sizeof(ctx_new.range.level[0].cat)); | |
7420ed23 VY |
3018 | } |
3019 | if (mls_context_isvalid(&policydb, &ctx_new) != 1) | |
3020 | goto netlbl_secattr_to_sid_return_cleanup; | |
3021 | ||
3022 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
3023 | if (rc != 0) | |
3024 | goto netlbl_secattr_to_sid_return_cleanup; | |
3025 | ||
5dbe1eb0 | 3026 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 3027 | |
7420ed23 VY |
3028 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
3029 | } else { | |
388b2405 | 3030 | *sid = SECSID_NULL; |
7420ed23 VY |
3031 | rc = 0; |
3032 | } | |
3033 | ||
3034 | netlbl_secattr_to_sid_return: | |
0804d113 | 3035 | read_unlock(&policy_rwlock); |
7420ed23 VY |
3036 | return rc; |
3037 | netlbl_secattr_to_sid_return_cleanup: | |
3038 | ebitmap_destroy(&ctx_new.range.level[0].cat); | |
3039 | goto netlbl_secattr_to_sid_return; | |
3040 | } | |
3041 | ||
3042 | /** | |
5778eabd PM |
3043 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
3044 | * @sid: the SELinux SID | |
3045 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
3046 | * |
3047 | * Description: | |
5778eabd PM |
3048 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
3049 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
3050 | * |
3051 | */ | |
5778eabd | 3052 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 3053 | { |
99d854d2 | 3054 | int rc; |
7420ed23 VY |
3055 | struct context *ctx; |
3056 | ||
3057 | if (!ss_initialized) | |
3058 | return 0; | |
3059 | ||
0804d113 | 3060 | read_lock(&policy_rwlock); |
7420ed23 | 3061 | ctx = sidtab_search(&sidtab, sid); |
99d854d2 PM |
3062 | if (ctx == NULL) { |
3063 | rc = -ENOENT; | |
5778eabd | 3064 | goto netlbl_sid_to_secattr_failure; |
99d854d2 | 3065 | } |
5778eabd PM |
3066 | secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], |
3067 | GFP_ATOMIC); | |
99d854d2 PM |
3068 | if (secattr->domain == NULL) { |
3069 | rc = -ENOMEM; | |
3070 | goto netlbl_sid_to_secattr_failure; | |
3071 | } | |
8d75899d PM |
3072 | secattr->attr.secid = sid; |
3073 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
3074 | mls_export_netlbl_lvl(ctx, secattr); |
3075 | rc = mls_export_netlbl_cat(ctx, secattr); | |
bf0edf39 | 3076 | if (rc != 0) |
5778eabd | 3077 | goto netlbl_sid_to_secattr_failure; |
0804d113 | 3078 | read_unlock(&policy_rwlock); |
99f59ed0 | 3079 | |
5778eabd | 3080 | return 0; |
f8687afe | 3081 | |
5778eabd | 3082 | netlbl_sid_to_secattr_failure: |
0804d113 | 3083 | read_unlock(&policy_rwlock); |
f8687afe PM |
3084 | return rc; |
3085 | } | |
7420ed23 | 3086 | #endif /* CONFIG_NETLABEL */ |