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 | * |
82c21bfa | 16 | * Updated: Hewlett-Packard <paul@paul-moore.com> |
7420ed23 VY |
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 | * | |
0719aaf5 GT |
29 | * Updated: Guido Trentalancia <guido@trentalancia.com> |
30 | * | |
31 | * Added support for runtime switching of the policy type | |
32 | * | |
44c2d9bd | 33 | * Copyright (C) 2008, 2009 NEC Corporation |
3bb56b25 | 34 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
376bd9cb | 35 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 36 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
37 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
38 | * This program is free software; you can redistribute it and/or modify | |
5d55a345 | 39 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
40 | * the Free Software Foundation, version 2. |
41 | */ | |
42 | #include <linux/kernel.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/spinlock.h> | |
9f2ad665 | 46 | #include <linux/rcupdate.h> |
1da177e4 LT |
47 | #include <linux/errno.h> |
48 | #include <linux/in.h> | |
49 | #include <linux/sched.h> | |
50 | #include <linux/audit.h> | |
bb003079 | 51 | #include <linux/mutex.h> |
0e55a004 | 52 | #include <linux/selinux.h> |
6371dcd3 | 53 | #include <linux/flex_array.h> |
f0d3d989 | 54 | #include <linux/vmalloc.h> |
7420ed23 | 55 | #include <net/netlabel.h> |
bb003079 | 56 | |
1da177e4 LT |
57 | #include "flask.h" |
58 | #include "avc.h" | |
59 | #include "avc_ss.h" | |
60 | #include "security.h" | |
61 | #include "context.h" | |
62 | #include "policydb.h" | |
63 | #include "sidtab.h" | |
64 | #include "services.h" | |
65 | #include "conditional.h" | |
66 | #include "mls.h" | |
7420ed23 | 67 | #include "objsec.h" |
c60475bf | 68 | #include "netlabel.h" |
3de4bab5 | 69 | #include "xfrm.h" |
02752760 | 70 | #include "ebitmap.h" |
9d57a7f9 | 71 | #include "audit.h" |
1da177e4 | 72 | |
3bb56b25 | 73 | int selinux_policycap_netpeer; |
b0c636b9 | 74 | int selinux_policycap_openperm; |
2be4d74f | 75 | int selinux_policycap_alwaysnetwork; |
3bb56b25 | 76 | |
1da177e4 | 77 | static DEFINE_RWLOCK(policy_rwlock); |
1da177e4 LT |
78 | |
79 | static struct sidtab sidtab; | |
80 | struct policydb policydb; | |
5d55a345 | 81 | int ss_initialized; |
1da177e4 LT |
82 | |
83 | /* | |
84 | * The largest sequence number that has been used when | |
85 | * providing an access decision to the access vector cache. | |
86 | * The sequence number only changes when a policy change | |
87 | * occurs. | |
88 | */ | |
5d55a345 | 89 | static u32 latest_granting; |
1da177e4 LT |
90 | |
91 | /* Forward declaration. */ | |
92 | static int context_struct_to_string(struct context *context, char **scontext, | |
93 | u32 *scontext_len); | |
94 | ||
19439d05 | 95 | static void context_struct_compute_av(struct context *scontext, |
fa1aa143 JVS |
96 | struct context *tcontext, |
97 | u16 tclass, | |
98 | struct av_decision *avd, | |
99 | struct extended_perms *xperms); | |
c6d3aaa4 SS |
100 | |
101 | struct selinux_mapping { | |
102 | u16 value; /* policy value */ | |
103 | unsigned num_perms; | |
104 | u32 perms[sizeof(u32) * 8]; | |
105 | }; | |
106 | ||
107 | static struct selinux_mapping *current_mapping; | |
108 | static u16 current_mapping_size; | |
109 | ||
110 | static int selinux_set_mapping(struct policydb *pol, | |
111 | struct security_class_mapping *map, | |
112 | struct selinux_mapping **out_map_p, | |
113 | u16 *out_map_size) | |
114 | { | |
115 | struct selinux_mapping *out_map = NULL; | |
116 | size_t size = sizeof(struct selinux_mapping); | |
117 | u16 i, j; | |
118 | unsigned k; | |
119 | bool print_unknown_handle = false; | |
120 | ||
121 | /* Find number of classes in the input mapping */ | |
122 | if (!map) | |
123 | return -EINVAL; | |
124 | i = 0; | |
125 | while (map[i].name) | |
126 | i++; | |
127 | ||
128 | /* Allocate space for the class records, plus one for class zero */ | |
129 | out_map = kcalloc(++i, size, GFP_ATOMIC); | |
130 | if (!out_map) | |
131 | return -ENOMEM; | |
132 | ||
133 | /* Store the raw class and permission values */ | |
134 | j = 0; | |
135 | while (map[j].name) { | |
136 | struct security_class_mapping *p_in = map + (j++); | |
137 | struct selinux_mapping *p_out = out_map + j; | |
138 | ||
139 | /* An empty class string skips ahead */ | |
140 | if (!strcmp(p_in->name, "")) { | |
141 | p_out->num_perms = 0; | |
142 | continue; | |
143 | } | |
144 | ||
145 | p_out->value = string_to_security_class(pol, p_in->name); | |
146 | if (!p_out->value) { | |
147 | printk(KERN_INFO | |
148 | "SELinux: Class %s not defined in policy.\n", | |
149 | p_in->name); | |
150 | if (pol->reject_unknown) | |
151 | goto err; | |
152 | p_out->num_perms = 0; | |
153 | print_unknown_handle = true; | |
154 | continue; | |
155 | } | |
156 | ||
157 | k = 0; | |
158 | while (p_in->perms && p_in->perms[k]) { | |
159 | /* An empty permission string skips ahead */ | |
160 | if (!*p_in->perms[k]) { | |
161 | k++; | |
162 | continue; | |
163 | } | |
164 | p_out->perms[k] = string_to_av_perm(pol, p_out->value, | |
165 | p_in->perms[k]); | |
166 | if (!p_out->perms[k]) { | |
167 | printk(KERN_INFO | |
168 | "SELinux: Permission %s in class %s not defined in policy.\n", | |
169 | p_in->perms[k], p_in->name); | |
170 | if (pol->reject_unknown) | |
171 | goto err; | |
172 | print_unknown_handle = true; | |
173 | } | |
174 | ||
175 | k++; | |
176 | } | |
177 | p_out->num_perms = k; | |
178 | } | |
179 | ||
180 | if (print_unknown_handle) | |
181 | printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n", | |
182 | pol->allow_unknown ? "allowed" : "denied"); | |
183 | ||
184 | *out_map_p = out_map; | |
185 | *out_map_size = i; | |
186 | return 0; | |
187 | err: | |
188 | kfree(out_map); | |
189 | return -EINVAL; | |
190 | } | |
191 | ||
192 | /* | |
193 | * Get real, policy values from mapped values | |
194 | */ | |
195 | ||
196 | static u16 unmap_class(u16 tclass) | |
197 | { | |
198 | if (tclass < current_mapping_size) | |
199 | return current_mapping[tclass].value; | |
200 | ||
201 | return tclass; | |
202 | } | |
203 | ||
6f5317e7 HC |
204 | /* |
205 | * Get kernel value for class from its policy value | |
206 | */ | |
207 | static u16 map_class(u16 pol_value) | |
208 | { | |
209 | u16 i; | |
210 | ||
211 | for (i = 1; i < current_mapping_size; i++) { | |
212 | if (current_mapping[i].value == pol_value) | |
213 | return i; | |
214 | } | |
215 | ||
85cd6da5 | 216 | return SECCLASS_NULL; |
6f5317e7 HC |
217 | } |
218 | ||
c6d3aaa4 SS |
219 | static void map_decision(u16 tclass, struct av_decision *avd, |
220 | int allow_unknown) | |
221 | { | |
222 | if (tclass < current_mapping_size) { | |
223 | unsigned i, n = current_mapping[tclass].num_perms; | |
224 | u32 result; | |
225 | ||
226 | for (i = 0, result = 0; i < n; i++) { | |
227 | if (avd->allowed & current_mapping[tclass].perms[i]) | |
228 | result |= 1<<i; | |
229 | if (allow_unknown && !current_mapping[tclass].perms[i]) | |
230 | result |= 1<<i; | |
231 | } | |
232 | avd->allowed = result; | |
233 | ||
234 | for (i = 0, result = 0; i < n; i++) | |
235 | if (avd->auditallow & current_mapping[tclass].perms[i]) | |
236 | result |= 1<<i; | |
237 | avd->auditallow = result; | |
238 | ||
239 | for (i = 0, result = 0; i < n; i++) { | |
240 | if (avd->auditdeny & current_mapping[tclass].perms[i]) | |
241 | result |= 1<<i; | |
242 | if (!allow_unknown && !current_mapping[tclass].perms[i]) | |
243 | result |= 1<<i; | |
244 | } | |
0bce9527 EP |
245 | /* |
246 | * In case the kernel has a bug and requests a permission | |
247 | * between num_perms and the maximum permission number, we | |
248 | * should audit that denial | |
249 | */ | |
250 | for (; i < (sizeof(u32)*8); i++) | |
251 | result |= 1<<i; | |
c6d3aaa4 SS |
252 | avd->auditdeny = result; |
253 | } | |
254 | } | |
255 | ||
0719aaf5 GT |
256 | int security_mls_enabled(void) |
257 | { | |
258 | return policydb.mls_enabled; | |
259 | } | |
c6d3aaa4 | 260 | |
1da177e4 LT |
261 | /* |
262 | * Return the boolean value of a constraint expression | |
263 | * when it is applied to the specified source and target | |
264 | * security contexts. | |
265 | * | |
266 | * xcontext is a special beast... It is used by the validatetrans rules | |
267 | * only. For these rules, scontext is the context before the transition, | |
268 | * tcontext is the context after the transition, and xcontext is the context | |
269 | * of the process performing the transition. All other callers of | |
270 | * constraint_expr_eval should pass in NULL for xcontext. | |
271 | */ | |
272 | static int constraint_expr_eval(struct context *scontext, | |
273 | struct context *tcontext, | |
274 | struct context *xcontext, | |
275 | struct constraint_expr *cexpr) | |
276 | { | |
277 | u32 val1, val2; | |
278 | struct context *c; | |
279 | struct role_datum *r1, *r2; | |
280 | struct mls_level *l1, *l2; | |
281 | struct constraint_expr *e; | |
282 | int s[CEXPR_MAXDEPTH]; | |
283 | int sp = -1; | |
284 | ||
285 | for (e = cexpr; e; e = e->next) { | |
286 | switch (e->expr_type) { | |
287 | case CEXPR_NOT: | |
288 | BUG_ON(sp < 0); | |
289 | s[sp] = !s[sp]; | |
290 | break; | |
291 | case CEXPR_AND: | |
292 | BUG_ON(sp < 1); | |
293 | sp--; | |
c1a7368a | 294 | s[sp] &= s[sp + 1]; |
1da177e4 LT |
295 | break; |
296 | case CEXPR_OR: | |
297 | BUG_ON(sp < 1); | |
298 | sp--; | |
c1a7368a | 299 | s[sp] |= s[sp + 1]; |
1da177e4 LT |
300 | break; |
301 | case CEXPR_ATTR: | |
c1a7368a | 302 | if (sp == (CEXPR_MAXDEPTH - 1)) |
1da177e4 LT |
303 | return 0; |
304 | switch (e->attr) { | |
305 | case CEXPR_USER: | |
306 | val1 = scontext->user; | |
307 | val2 = tcontext->user; | |
308 | break; | |
309 | case CEXPR_TYPE: | |
310 | val1 = scontext->type; | |
311 | val2 = tcontext->type; | |
312 | break; | |
313 | case CEXPR_ROLE: | |
314 | val1 = scontext->role; | |
315 | val2 = tcontext->role; | |
316 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
317 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
318 | switch (e->op) { | |
319 | case CEXPR_DOM: | |
320 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
321 | val2 - 1); | |
322 | continue; | |
323 | case CEXPR_DOMBY: | |
324 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
325 | val1 - 1); | |
326 | continue; | |
327 | case CEXPR_INCOMP: | |
5d55a345 EP |
328 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
329 | val2 - 1) && | |
330 | !ebitmap_get_bit(&r2->dominates, | |
331 | val1 - 1)); | |
1da177e4 LT |
332 | continue; |
333 | default: | |
334 | break; | |
335 | } | |
336 | break; | |
337 | case CEXPR_L1L2: | |
338 | l1 = &(scontext->range.level[0]); | |
339 | l2 = &(tcontext->range.level[0]); | |
340 | goto mls_ops; | |
341 | case CEXPR_L1H2: | |
342 | l1 = &(scontext->range.level[0]); | |
343 | l2 = &(tcontext->range.level[1]); | |
344 | goto mls_ops; | |
345 | case CEXPR_H1L2: | |
346 | l1 = &(scontext->range.level[1]); | |
347 | l2 = &(tcontext->range.level[0]); | |
348 | goto mls_ops; | |
349 | case CEXPR_H1H2: | |
350 | l1 = &(scontext->range.level[1]); | |
351 | l2 = &(tcontext->range.level[1]); | |
352 | goto mls_ops; | |
353 | case CEXPR_L1H1: | |
354 | l1 = &(scontext->range.level[0]); | |
355 | l2 = &(scontext->range.level[1]); | |
356 | goto mls_ops; | |
357 | case CEXPR_L2H2: | |
358 | l1 = &(tcontext->range.level[0]); | |
359 | l2 = &(tcontext->range.level[1]); | |
360 | goto mls_ops; | |
361 | mls_ops: | |
362 | switch (e->op) { | |
363 | case CEXPR_EQ: | |
364 | s[++sp] = mls_level_eq(l1, l2); | |
365 | continue; | |
366 | case CEXPR_NEQ: | |
367 | s[++sp] = !mls_level_eq(l1, l2); | |
368 | continue; | |
369 | case CEXPR_DOM: | |
370 | s[++sp] = mls_level_dom(l1, l2); | |
371 | continue; | |
372 | case CEXPR_DOMBY: | |
373 | s[++sp] = mls_level_dom(l2, l1); | |
374 | continue; | |
375 | case CEXPR_INCOMP: | |
376 | s[++sp] = mls_level_incomp(l2, l1); | |
377 | continue; | |
378 | default: | |
379 | BUG(); | |
380 | return 0; | |
381 | } | |
382 | break; | |
383 | default: | |
384 | BUG(); | |
385 | return 0; | |
386 | } | |
387 | ||
388 | switch (e->op) { | |
389 | case CEXPR_EQ: | |
390 | s[++sp] = (val1 == val2); | |
391 | break; | |
392 | case CEXPR_NEQ: | |
393 | s[++sp] = (val1 != val2); | |
394 | break; | |
395 | default: | |
396 | BUG(); | |
397 | return 0; | |
398 | } | |
399 | break; | |
400 | case CEXPR_NAMES: | |
401 | if (sp == (CEXPR_MAXDEPTH-1)) | |
402 | return 0; | |
403 | c = scontext; | |
404 | if (e->attr & CEXPR_TARGET) | |
405 | c = tcontext; | |
406 | else if (e->attr & CEXPR_XTARGET) { | |
407 | c = xcontext; | |
408 | if (!c) { | |
409 | BUG(); | |
410 | return 0; | |
411 | } | |
412 | } | |
413 | if (e->attr & CEXPR_USER) | |
414 | val1 = c->user; | |
415 | else if (e->attr & CEXPR_ROLE) | |
416 | val1 = c->role; | |
417 | else if (e->attr & CEXPR_TYPE) | |
418 | val1 = c->type; | |
419 | else { | |
420 | BUG(); | |
421 | return 0; | |
422 | } | |
423 | ||
424 | switch (e->op) { | |
425 | case CEXPR_EQ: | |
426 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
427 | break; | |
428 | case CEXPR_NEQ: | |
429 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
430 | break; | |
431 | default: | |
432 | BUG(); | |
433 | return 0; | |
434 | } | |
435 | break; | |
436 | default: | |
437 | BUG(); | |
438 | return 0; | |
439 | } | |
440 | } | |
441 | ||
442 | BUG_ON(sp != 0); | |
443 | return s[0]; | |
444 | } | |
445 | ||
44c2d9bd KK |
446 | /* |
447 | * security_dump_masked_av - dumps masked permissions during | |
448 | * security_compute_av due to RBAC, MLS/Constraint and Type bounds. | |
449 | */ | |
450 | static int dump_masked_av_helper(void *k, void *d, void *args) | |
451 | { | |
452 | struct perm_datum *pdatum = d; | |
453 | char **permission_names = args; | |
454 | ||
455 | BUG_ON(pdatum->value < 1 || pdatum->value > 32); | |
456 | ||
457 | permission_names[pdatum->value - 1] = (char *)k; | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
462 | static void security_dump_masked_av(struct context *scontext, | |
463 | struct context *tcontext, | |
464 | u16 tclass, | |
465 | u32 permissions, | |
466 | const char *reason) | |
467 | { | |
468 | struct common_datum *common_dat; | |
469 | struct class_datum *tclass_dat; | |
470 | struct audit_buffer *ab; | |
471 | char *tclass_name; | |
472 | char *scontext_name = NULL; | |
473 | char *tcontext_name = NULL; | |
474 | char *permission_names[32]; | |
2da5d31b JM |
475 | int index; |
476 | u32 length; | |
44c2d9bd KK |
477 | bool need_comma = false; |
478 | ||
479 | if (!permissions) | |
480 | return; | |
481 | ||
ac76c05b | 482 | tclass_name = sym_name(&policydb, SYM_CLASSES, tclass - 1); |
44c2d9bd KK |
483 | tclass_dat = policydb.class_val_to_struct[tclass - 1]; |
484 | common_dat = tclass_dat->comdatum; | |
485 | ||
486 | /* init permission_names */ | |
487 | if (common_dat && | |
488 | hashtab_map(common_dat->permissions.table, | |
489 | dump_masked_av_helper, permission_names) < 0) | |
490 | goto out; | |
491 | ||
492 | if (hashtab_map(tclass_dat->permissions.table, | |
493 | dump_masked_av_helper, permission_names) < 0) | |
494 | goto out; | |
495 | ||
496 | /* get scontext/tcontext in text form */ | |
497 | if (context_struct_to_string(scontext, | |
498 | &scontext_name, &length) < 0) | |
499 | goto out; | |
500 | ||
501 | if (context_struct_to_string(tcontext, | |
502 | &tcontext_name, &length) < 0) | |
503 | goto out; | |
504 | ||
505 | /* audit a message */ | |
506 | ab = audit_log_start(current->audit_context, | |
507 | GFP_ATOMIC, AUDIT_SELINUX_ERR); | |
508 | if (!ab) | |
509 | goto out; | |
510 | ||
511 | audit_log_format(ab, "op=security_compute_av reason=%s " | |
512 | "scontext=%s tcontext=%s tclass=%s perms=", | |
513 | reason, scontext_name, tcontext_name, tclass_name); | |
514 | ||
515 | for (index = 0; index < 32; index++) { | |
516 | u32 mask = (1 << index); | |
517 | ||
518 | if ((mask & permissions) == 0) | |
519 | continue; | |
520 | ||
521 | audit_log_format(ab, "%s%s", | |
522 | need_comma ? "," : "", | |
523 | permission_names[index] | |
524 | ? permission_names[index] : "????"); | |
525 | need_comma = true; | |
526 | } | |
527 | audit_log_end(ab); | |
528 | out: | |
529 | /* release scontext/tcontext */ | |
530 | kfree(tcontext_name); | |
531 | kfree(scontext_name); | |
532 | ||
533 | return; | |
534 | } | |
535 | ||
d9250dea KK |
536 | /* |
537 | * security_boundary_permission - drops violated permissions | |
538 | * on boundary constraint. | |
539 | */ | |
540 | static void type_attribute_bounds_av(struct context *scontext, | |
541 | struct context *tcontext, | |
542 | u16 tclass, | |
d9250dea KK |
543 | struct av_decision *avd) |
544 | { | |
2ae3ba39 KK |
545 | struct context lo_scontext; |
546 | struct context lo_tcontext; | |
547 | struct av_decision lo_avd; | |
23bdecb0 EP |
548 | struct type_datum *source; |
549 | struct type_datum *target; | |
2ae3ba39 | 550 | u32 masked = 0; |
d9250dea | 551 | |
23bdecb0 EP |
552 | source = flex_array_get_ptr(policydb.type_val_to_struct_array, |
553 | scontext->type - 1); | |
554 | BUG_ON(!source); | |
555 | ||
556 | target = flex_array_get_ptr(policydb.type_val_to_struct_array, | |
557 | tcontext->type - 1); | |
558 | BUG_ON(!target); | |
559 | ||
d9250dea KK |
560 | if (source->bounds) { |
561 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
562 | ||
563 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); | |
564 | lo_scontext.type = source->bounds; | |
565 | ||
566 | context_struct_compute_av(&lo_scontext, | |
567 | tcontext, | |
568 | tclass, | |
fa1aa143 JVS |
569 | &lo_avd, |
570 | NULL); | |
d9250dea KK |
571 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) |
572 | return; /* no masked permission */ | |
573 | masked = ~lo_avd.allowed & avd->allowed; | |
2ae3ba39 KK |
574 | } |
575 | ||
576 | if (target->bounds) { | |
577 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
578 | ||
579 | memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); | |
580 | lo_tcontext.type = target->bounds; | |
581 | ||
582 | context_struct_compute_av(scontext, | |
583 | &lo_tcontext, | |
584 | tclass, | |
fa1aa143 JVS |
585 | &lo_avd, |
586 | NULL); | |
2ae3ba39 KK |
587 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) |
588 | return; /* no masked permission */ | |
589 | masked = ~lo_avd.allowed & avd->allowed; | |
590 | } | |
591 | ||
592 | if (source->bounds && target->bounds) { | |
593 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
594 | /* | |
595 | * lo_scontext and lo_tcontext are already | |
596 | * set up. | |
597 | */ | |
598 | ||
599 | context_struct_compute_av(&lo_scontext, | |
600 | &lo_tcontext, | |
601 | tclass, | |
fa1aa143 JVS |
602 | &lo_avd, |
603 | NULL); | |
2ae3ba39 KK |
604 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) |
605 | return; /* no masked permission */ | |
606 | masked = ~lo_avd.allowed & avd->allowed; | |
607 | } | |
d9250dea | 608 | |
2ae3ba39 | 609 | if (masked) { |
d9250dea KK |
610 | /* mask violated permissions */ |
611 | avd->allowed &= ~masked; | |
612 | ||
44c2d9bd KK |
613 | /* audit masked permissions */ |
614 | security_dump_masked_av(scontext, tcontext, | |
615 | tclass, masked, "bounds"); | |
d9250dea KK |
616 | } |
617 | } | |
618 | ||
1da177e4 | 619 | /* |
fa1aa143 JVS |
620 | * flag which drivers have permissions |
621 | * only looking for ioctl based extended permssions | |
622 | */ | |
623 | void services_compute_xperms_drivers( | |
624 | struct extended_perms *xperms, | |
625 | struct avtab_node *node) | |
626 | { | |
627 | unsigned int i; | |
628 | ||
629 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
630 | /* if one or more driver has all permissions allowed */ | |
631 | for (i = 0; i < ARRAY_SIZE(xperms->drivers.p); i++) | |
632 | xperms->drivers.p[i] |= node->datum.u.xperms->perms.p[i]; | |
633 | } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
634 | /* if allowing permissions within a driver */ | |
635 | security_xperm_set(xperms->drivers.p, | |
636 | node->datum.u.xperms->driver); | |
637 | } | |
638 | ||
639 | /* If no ioctl commands are allowed, ignore auditallow and auditdeny */ | |
640 | if (node->key.specified & AVTAB_XPERMS_ALLOWED) | |
641 | xperms->len = 1; | |
642 | } | |
643 | ||
644 | /* | |
645 | * Compute access vectors and extended permissions based on a context | |
646 | * structure pair for the permissions in a particular class. | |
1da177e4 | 647 | */ |
19439d05 | 648 | static void context_struct_compute_av(struct context *scontext, |
fa1aa143 JVS |
649 | struct context *tcontext, |
650 | u16 tclass, | |
651 | struct av_decision *avd, | |
652 | struct extended_perms *xperms) | |
1da177e4 LT |
653 | { |
654 | struct constraint_node *constraint; | |
655 | struct role_allow *ra; | |
656 | struct avtab_key avkey; | |
782ebb99 | 657 | struct avtab_node *node; |
1da177e4 | 658 | struct class_datum *tclass_datum; |
782ebb99 SS |
659 | struct ebitmap *sattr, *tattr; |
660 | struct ebitmap_node *snode, *tnode; | |
661 | unsigned int i, j; | |
1da177e4 | 662 | |
1da177e4 | 663 | avd->allowed = 0; |
1da177e4 LT |
664 | avd->auditallow = 0; |
665 | avd->auditdeny = 0xffffffff; | |
fa1aa143 JVS |
666 | if (xperms) { |
667 | memset(&xperms->drivers, 0, sizeof(xperms->drivers)); | |
668 | xperms->len = 0; | |
669 | } | |
1da177e4 | 670 | |
c6d3aaa4 SS |
671 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { |
672 | if (printk_ratelimit()) | |
673 | printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass); | |
19439d05 | 674 | return; |
c6d3aaa4 | 675 | } |
3f12070e EP |
676 | |
677 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
678 | ||
1da177e4 LT |
679 | /* |
680 | * If a specific type enforcement rule was defined for | |
681 | * this permission check, then use it. | |
682 | */ | |
1da177e4 | 683 | avkey.target_class = tclass; |
fa1aa143 | 684 | avkey.specified = AVTAB_AV | AVTAB_XPERMS; |
6371dcd3 EP |
685 | sattr = flex_array_get(policydb.type_attr_map_array, scontext->type - 1); |
686 | BUG_ON(!sattr); | |
687 | tattr = flex_array_get(policydb.type_attr_map_array, tcontext->type - 1); | |
688 | BUG_ON(!tattr); | |
9fe79ad1 KK |
689 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
690 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
691 | avkey.source_type = i + 1; |
692 | avkey.target_type = j + 1; | |
693 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
dbc74c65 | 694 | node; |
782ebb99 SS |
695 | node = avtab_search_node_next(node, avkey.specified)) { |
696 | if (node->key.specified == AVTAB_ALLOWED) | |
fa1aa143 | 697 | avd->allowed |= node->datum.u.data; |
782ebb99 | 698 | else if (node->key.specified == AVTAB_AUDITALLOW) |
fa1aa143 | 699 | avd->auditallow |= node->datum.u.data; |
782ebb99 | 700 | else if (node->key.specified == AVTAB_AUDITDENY) |
fa1aa143 JVS |
701 | avd->auditdeny &= node->datum.u.data; |
702 | else if (xperms && (node->key.specified & AVTAB_XPERMS)) | |
703 | services_compute_xperms_drivers(xperms, node); | |
782ebb99 | 704 | } |
1da177e4 | 705 | |
782ebb99 | 706 | /* Check conditional av table for additional permissions */ |
fa1aa143 JVS |
707 | cond_compute_av(&policydb.te_cond_avtab, &avkey, |
708 | avd, xperms); | |
782ebb99 SS |
709 | |
710 | } | |
711 | } | |
1da177e4 LT |
712 | |
713 | /* | |
714 | * Remove any permissions prohibited by a constraint (this includes | |
715 | * the MLS policy). | |
716 | */ | |
717 | constraint = tclass_datum->constraints; | |
718 | while (constraint) { | |
719 | if ((constraint->permissions & (avd->allowed)) && | |
720 | !constraint_expr_eval(scontext, tcontext, NULL, | |
721 | constraint->expr)) { | |
caabbdc0 | 722 | avd->allowed &= ~(constraint->permissions); |
1da177e4 LT |
723 | } |
724 | constraint = constraint->next; | |
725 | } | |
726 | ||
727 | /* | |
728 | * If checking process transition permission and the | |
729 | * role is changing, then check the (current_role, new_role) | |
730 | * pair. | |
731 | */ | |
c6d3aaa4 SS |
732 | if (tclass == policydb.process_class && |
733 | (avd->allowed & policydb.process_trans_perms) && | |
1da177e4 LT |
734 | scontext->role != tcontext->role) { |
735 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
736 | if (scontext->role == ra->role && | |
737 | tcontext->role == ra->new_role) | |
738 | break; | |
739 | } | |
740 | if (!ra) | |
c6d3aaa4 | 741 | avd->allowed &= ~policydb.process_trans_perms; |
1da177e4 LT |
742 | } |
743 | ||
d9250dea KK |
744 | /* |
745 | * If the given source and target types have boundary | |
746 | * constraint, lazy checks have to mask any violated | |
747 | * permission and notice it to userspace via audit. | |
748 | */ | |
749 | type_attribute_bounds_av(scontext, tcontext, | |
19439d05 | 750 | tclass, avd); |
1da177e4 LT |
751 | } |
752 | ||
753 | static int security_validtrans_handle_fail(struct context *ocontext, | |
5d55a345 EP |
754 | struct context *ncontext, |
755 | struct context *tcontext, | |
756 | u16 tclass) | |
1da177e4 LT |
757 | { |
758 | char *o = NULL, *n = NULL, *t = NULL; | |
759 | u32 olen, nlen, tlen; | |
760 | ||
4b02b524 | 761 | if (context_struct_to_string(ocontext, &o, &olen)) |
1da177e4 | 762 | goto out; |
4b02b524 | 763 | if (context_struct_to_string(ncontext, &n, &nlen)) |
1da177e4 | 764 | goto out; |
4b02b524 | 765 | if (context_struct_to_string(tcontext, &t, &tlen)) |
1da177e4 | 766 | goto out; |
9ad9ad38 | 767 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
4093a844 | 768 | "op=security_validate_transition seresult=denied" |
5d55a345 | 769 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", |
ac76c05b | 770 | o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); |
1da177e4 LT |
771 | out: |
772 | kfree(o); | |
773 | kfree(n); | |
774 | kfree(t); | |
775 | ||
776 | if (!selinux_enforcing) | |
777 | return 0; | |
778 | return -EPERM; | |
779 | } | |
780 | ||
781 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
c6d3aaa4 | 782 | u16 orig_tclass) |
1da177e4 LT |
783 | { |
784 | struct context *ocontext; | |
785 | struct context *ncontext; | |
786 | struct context *tcontext; | |
787 | struct class_datum *tclass_datum; | |
788 | struct constraint_node *constraint; | |
c6d3aaa4 | 789 | u16 tclass; |
1da177e4 LT |
790 | int rc = 0; |
791 | ||
792 | if (!ss_initialized) | |
793 | return 0; | |
794 | ||
0804d113 | 795 | read_lock(&policy_rwlock); |
1da177e4 | 796 | |
c6d3aaa4 SS |
797 | tclass = unmap_class(orig_tclass); |
798 | ||
1da177e4 | 799 | if (!tclass || tclass > policydb.p_classes.nprim) { |
744ba35e EP |
800 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", |
801 | __func__, tclass); | |
1da177e4 LT |
802 | rc = -EINVAL; |
803 | goto out; | |
804 | } | |
805 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
806 | ||
807 | ocontext = sidtab_search(&sidtab, oldsid); | |
808 | if (!ocontext) { | |
744ba35e EP |
809 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
810 | __func__, oldsid); | |
1da177e4 LT |
811 | rc = -EINVAL; |
812 | goto out; | |
813 | } | |
814 | ||
815 | ncontext = sidtab_search(&sidtab, newsid); | |
816 | if (!ncontext) { | |
744ba35e EP |
817 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
818 | __func__, newsid); | |
1da177e4 LT |
819 | rc = -EINVAL; |
820 | goto out; | |
821 | } | |
822 | ||
823 | tcontext = sidtab_search(&sidtab, tasksid); | |
824 | if (!tcontext) { | |
744ba35e EP |
825 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
826 | __func__, tasksid); | |
1da177e4 LT |
827 | rc = -EINVAL; |
828 | goto out; | |
829 | } | |
830 | ||
831 | constraint = tclass_datum->validatetrans; | |
832 | while (constraint) { | |
833 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 834 | constraint->expr)) { |
1da177e4 | 835 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
5d55a345 | 836 | tcontext, tclass); |
1da177e4 LT |
837 | goto out; |
838 | } | |
839 | constraint = constraint->next; | |
840 | } | |
841 | ||
842 | out: | |
0804d113 | 843 | read_unlock(&policy_rwlock); |
1da177e4 LT |
844 | return rc; |
845 | } | |
846 | ||
d9250dea KK |
847 | /* |
848 | * security_bounded_transition - check whether the given | |
849 | * transition is directed to bounded, or not. | |
850 | * It returns 0, if @newsid is bounded by @oldsid. | |
851 | * Otherwise, it returns error code. | |
852 | * | |
853 | * @oldsid : current security identifier | |
854 | * @newsid : destinated security identifier | |
855 | */ | |
856 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
857 | { | |
858 | struct context *old_context, *new_context; | |
859 | struct type_datum *type; | |
860 | int index; | |
4b02b524 | 861 | int rc; |
d9250dea KK |
862 | |
863 | read_lock(&policy_rwlock); | |
864 | ||
4b02b524 | 865 | rc = -EINVAL; |
d9250dea KK |
866 | old_context = sidtab_search(&sidtab, old_sid); |
867 | if (!old_context) { | |
868 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
869 | __func__, old_sid); | |
870 | goto out; | |
871 | } | |
872 | ||
4b02b524 | 873 | rc = -EINVAL; |
d9250dea KK |
874 | new_context = sidtab_search(&sidtab, new_sid); |
875 | if (!new_context) { | |
876 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
877 | __func__, new_sid); | |
878 | goto out; | |
879 | } | |
880 | ||
4b02b524 | 881 | rc = 0; |
af901ca1 | 882 | /* type/domain unchanged */ |
4b02b524 | 883 | if (old_context->type == new_context->type) |
d9250dea | 884 | goto out; |
d9250dea KK |
885 | |
886 | index = new_context->type; | |
887 | while (true) { | |
23bdecb0 EP |
888 | type = flex_array_get_ptr(policydb.type_val_to_struct_array, |
889 | index - 1); | |
d9250dea KK |
890 | BUG_ON(!type); |
891 | ||
892 | /* not bounded anymore */ | |
4b02b524 EP |
893 | rc = -EPERM; |
894 | if (!type->bounds) | |
d9250dea | 895 | break; |
d9250dea KK |
896 | |
897 | /* @newsid is bounded by @oldsid */ | |
4b02b524 EP |
898 | rc = 0; |
899 | if (type->bounds == old_context->type) | |
d9250dea | 900 | break; |
4b02b524 | 901 | |
d9250dea KK |
902 | index = type->bounds; |
903 | } | |
44c2d9bd KK |
904 | |
905 | if (rc) { | |
906 | char *old_name = NULL; | |
907 | char *new_name = NULL; | |
2da5d31b | 908 | u32 length; |
44c2d9bd KK |
909 | |
910 | if (!context_struct_to_string(old_context, | |
911 | &old_name, &length) && | |
912 | !context_struct_to_string(new_context, | |
913 | &new_name, &length)) { | |
914 | audit_log(current->audit_context, | |
915 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
916 | "op=security_bounded_transition " | |
4093a844 | 917 | "seresult=denied " |
44c2d9bd KK |
918 | "oldcontext=%s newcontext=%s", |
919 | old_name, new_name); | |
920 | } | |
921 | kfree(new_name); | |
922 | kfree(old_name); | |
923 | } | |
d9250dea KK |
924 | out: |
925 | read_unlock(&policy_rwlock); | |
926 | ||
927 | return rc; | |
928 | } | |
929 | ||
19439d05 | 930 | static void avd_init(struct av_decision *avd) |
c6d3aaa4 | 931 | { |
19439d05 SS |
932 | avd->allowed = 0; |
933 | avd->auditallow = 0; | |
934 | avd->auditdeny = 0xffffffff; | |
935 | avd->seqno = latest_granting; | |
936 | avd->flags = 0; | |
c6d3aaa4 SS |
937 | } |
938 | ||
fa1aa143 JVS |
939 | void services_compute_xperms_decision(struct extended_perms_decision *xpermd, |
940 | struct avtab_node *node) | |
941 | { | |
942 | unsigned int i; | |
943 | ||
944 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
945 | if (xpermd->driver != node->datum.u.xperms->driver) | |
946 | return; | |
947 | } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
948 | if (!security_xperm_test(node->datum.u.xperms->perms.p, | |
949 | xpermd->driver)) | |
950 | return; | |
951 | } else { | |
952 | BUG(); | |
953 | } | |
954 | ||
955 | if (node->key.specified == AVTAB_XPERMS_ALLOWED) { | |
956 | xpermd->used |= XPERMS_ALLOWED; | |
957 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
958 | memset(xpermd->allowed->p, 0xff, | |
959 | sizeof(xpermd->allowed->p)); | |
960 | } | |
961 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
962 | for (i = 0; i < ARRAY_SIZE(xpermd->allowed->p); i++) | |
963 | xpermd->allowed->p[i] |= | |
964 | node->datum.u.xperms->perms.p[i]; | |
965 | } | |
966 | } else if (node->key.specified == AVTAB_XPERMS_AUDITALLOW) { | |
967 | xpermd->used |= XPERMS_AUDITALLOW; | |
968 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
969 | memset(xpermd->auditallow->p, 0xff, | |
970 | sizeof(xpermd->auditallow->p)); | |
971 | } | |
972 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
973 | for (i = 0; i < ARRAY_SIZE(xpermd->auditallow->p); i++) | |
974 | xpermd->auditallow->p[i] |= | |
975 | node->datum.u.xperms->perms.p[i]; | |
976 | } | |
977 | } else if (node->key.specified == AVTAB_XPERMS_DONTAUDIT) { | |
978 | xpermd->used |= XPERMS_DONTAUDIT; | |
979 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
980 | memset(xpermd->dontaudit->p, 0xff, | |
981 | sizeof(xpermd->dontaudit->p)); | |
982 | } | |
983 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
984 | for (i = 0; i < ARRAY_SIZE(xpermd->dontaudit->p); i++) | |
985 | xpermd->dontaudit->p[i] |= | |
986 | node->datum.u.xperms->perms.p[i]; | |
987 | } | |
988 | } else { | |
989 | BUG(); | |
990 | } | |
991 | } | |
992 | ||
993 | void security_compute_xperms_decision(u32 ssid, | |
994 | u32 tsid, | |
995 | u16 orig_tclass, | |
996 | u8 driver, | |
997 | struct extended_perms_decision *xpermd) | |
998 | { | |
999 | u16 tclass; | |
1000 | struct context *scontext, *tcontext; | |
1001 | struct avtab_key avkey; | |
1002 | struct avtab_node *node; | |
1003 | struct ebitmap *sattr, *tattr; | |
1004 | struct ebitmap_node *snode, *tnode; | |
1005 | unsigned int i, j; | |
1006 | ||
1007 | xpermd->driver = driver; | |
1008 | xpermd->used = 0; | |
1009 | memset(xpermd->allowed->p, 0, sizeof(xpermd->allowed->p)); | |
1010 | memset(xpermd->auditallow->p, 0, sizeof(xpermd->auditallow->p)); | |
1011 | memset(xpermd->dontaudit->p, 0, sizeof(xpermd->dontaudit->p)); | |
1012 | ||
1013 | read_lock(&policy_rwlock); | |
1014 | if (!ss_initialized) | |
1015 | goto allow; | |
1016 | ||
1017 | scontext = sidtab_search(&sidtab, ssid); | |
1018 | if (!scontext) { | |
1019 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1020 | __func__, ssid); | |
1021 | goto out; | |
1022 | } | |
1023 | ||
1024 | tcontext = sidtab_search(&sidtab, tsid); | |
1025 | if (!tcontext) { | |
1026 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1027 | __func__, tsid); | |
1028 | goto out; | |
1029 | } | |
1030 | ||
1031 | tclass = unmap_class(orig_tclass); | |
1032 | if (unlikely(orig_tclass && !tclass)) { | |
1033 | if (policydb.allow_unknown) | |
1034 | goto allow; | |
1035 | goto out; | |
1036 | } | |
1037 | ||
1038 | ||
1039 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { | |
1040 | pr_warn_ratelimited("SELinux: Invalid class %hu\n", tclass); | |
1041 | goto out; | |
1042 | } | |
1043 | ||
1044 | avkey.target_class = tclass; | |
1045 | avkey.specified = AVTAB_XPERMS; | |
1046 | sattr = flex_array_get(policydb.type_attr_map_array, | |
1047 | scontext->type - 1); | |
1048 | BUG_ON(!sattr); | |
1049 | tattr = flex_array_get(policydb.type_attr_map_array, | |
1050 | tcontext->type - 1); | |
1051 | BUG_ON(!tattr); | |
1052 | ebitmap_for_each_positive_bit(sattr, snode, i) { | |
1053 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
1054 | avkey.source_type = i + 1; | |
1055 | avkey.target_type = j + 1; | |
1056 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
1057 | node; | |
1058 | node = avtab_search_node_next(node, avkey.specified)) | |
1059 | services_compute_xperms_decision(xpermd, node); | |
1060 | ||
1061 | cond_compute_xperms(&policydb.te_cond_avtab, | |
1062 | &avkey, xpermd); | |
1063 | } | |
1064 | } | |
1065 | out: | |
1066 | read_unlock(&policy_rwlock); | |
1067 | return; | |
1068 | allow: | |
1069 | memset(xpermd->allowed->p, 0xff, sizeof(xpermd->allowed->p)); | |
1070 | goto out; | |
1071 | } | |
19439d05 | 1072 | |
1da177e4 LT |
1073 | /** |
1074 | * security_compute_av - Compute access vector decisions. | |
1075 | * @ssid: source security identifier | |
1076 | * @tsid: target security identifier | |
1077 | * @tclass: target security class | |
1da177e4 | 1078 | * @avd: access vector decisions |
fa1aa143 | 1079 | * @xperms: extended permissions |
1da177e4 LT |
1080 | * |
1081 | * Compute a set of access vector decisions based on the | |
1082 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
1da177e4 | 1083 | */ |
19439d05 SS |
1084 | void security_compute_av(u32 ssid, |
1085 | u32 tsid, | |
1086 | u16 orig_tclass, | |
fa1aa143 JVS |
1087 | struct av_decision *avd, |
1088 | struct extended_perms *xperms) | |
1da177e4 | 1089 | { |
c6d3aaa4 | 1090 | u16 tclass; |
19439d05 | 1091 | struct context *scontext = NULL, *tcontext = NULL; |
c6d3aaa4 | 1092 | |
b7f3008a | 1093 | read_lock(&policy_rwlock); |
19439d05 | 1094 | avd_init(avd); |
fa1aa143 | 1095 | xperms->len = 0; |
c6d3aaa4 SS |
1096 | if (!ss_initialized) |
1097 | goto allow; | |
1098 | ||
19439d05 SS |
1099 | scontext = sidtab_search(&sidtab, ssid); |
1100 | if (!scontext) { | |
1101 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1102 | __func__, ssid); | |
1103 | goto out; | |
1104 | } | |
1105 | ||
1106 | /* permissive domain? */ | |
1107 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
1108 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
1109 | ||
1110 | tcontext = sidtab_search(&sidtab, tsid); | |
1111 | if (!tcontext) { | |
1112 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1113 | __func__, tsid); | |
1114 | goto out; | |
1115 | } | |
1116 | ||
c6d3aaa4 SS |
1117 | tclass = unmap_class(orig_tclass); |
1118 | if (unlikely(orig_tclass && !tclass)) { | |
1119 | if (policydb.allow_unknown) | |
1120 | goto allow; | |
b7f3008a | 1121 | goto out; |
c6d3aaa4 | 1122 | } |
fa1aa143 | 1123 | context_struct_compute_av(scontext, tcontext, tclass, avd, xperms); |
c6d3aaa4 | 1124 | map_decision(orig_tclass, avd, policydb.allow_unknown); |
b7f3008a | 1125 | out: |
c6d3aaa4 | 1126 | read_unlock(&policy_rwlock); |
19439d05 | 1127 | return; |
c6d3aaa4 SS |
1128 | allow: |
1129 | avd->allowed = 0xffffffff; | |
b7f3008a | 1130 | goto out; |
c6d3aaa4 SS |
1131 | } |
1132 | ||
19439d05 SS |
1133 | void security_compute_av_user(u32 ssid, |
1134 | u32 tsid, | |
1135 | u16 tclass, | |
1136 | struct av_decision *avd) | |
c6d3aaa4 | 1137 | { |
19439d05 | 1138 | struct context *scontext = NULL, *tcontext = NULL; |
1da177e4 | 1139 | |
19439d05 SS |
1140 | read_lock(&policy_rwlock); |
1141 | avd_init(avd); | |
1142 | if (!ss_initialized) | |
1143 | goto allow; | |
1144 | ||
1145 | scontext = sidtab_search(&sidtab, ssid); | |
1146 | if (!scontext) { | |
1147 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1148 | __func__, ssid); | |
1149 | goto out; | |
1da177e4 LT |
1150 | } |
1151 | ||
19439d05 SS |
1152 | /* permissive domain? */ |
1153 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
1154 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
1155 | ||
1156 | tcontext = sidtab_search(&sidtab, tsid); | |
1157 | if (!tcontext) { | |
1158 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1159 | __func__, tsid); | |
1160 | goto out; | |
1161 | } | |
1162 | ||
1163 | if (unlikely(!tclass)) { | |
1164 | if (policydb.allow_unknown) | |
1165 | goto allow; | |
1166 | goto out; | |
1167 | } | |
1168 | ||
fa1aa143 | 1169 | context_struct_compute_av(scontext, tcontext, tclass, avd, NULL); |
19439d05 | 1170 | out: |
0804d113 | 1171 | read_unlock(&policy_rwlock); |
19439d05 SS |
1172 | return; |
1173 | allow: | |
1174 | avd->allowed = 0xffffffff; | |
1175 | goto out; | |
1da177e4 LT |
1176 | } |
1177 | ||
1178 | /* | |
1179 | * Write the security context string representation of | |
1180 | * the context structure `context' into a dynamically | |
1181 | * allocated string of the correct size. Set `*scontext' | |
1182 | * to point to this string and set `*scontext_len' to | |
1183 | * the length of the string. | |
1184 | */ | |
1185 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
1186 | { | |
1187 | char *scontextp; | |
1188 | ||
d5630b9d EP |
1189 | if (scontext) |
1190 | *scontext = NULL; | |
1da177e4 LT |
1191 | *scontext_len = 0; |
1192 | ||
12b29f34 SS |
1193 | if (context->len) { |
1194 | *scontext_len = context->len; | |
bb7081ab EP |
1195 | if (scontext) { |
1196 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
1197 | if (!(*scontext)) | |
1198 | return -ENOMEM; | |
1199 | } | |
12b29f34 SS |
1200 | return 0; |
1201 | } | |
1202 | ||
1da177e4 | 1203 | /* Compute the size of the context. */ |
ac76c05b EP |
1204 | *scontext_len += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + 1; |
1205 | *scontext_len += strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + 1; | |
1206 | *scontext_len += strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)) + 1; | |
1da177e4 LT |
1207 | *scontext_len += mls_compute_context_len(context); |
1208 | ||
d5630b9d EP |
1209 | if (!scontext) |
1210 | return 0; | |
1211 | ||
1da177e4 LT |
1212 | /* Allocate space for the context; caller must free this space. */ |
1213 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 1214 | if (!scontextp) |
1da177e4 | 1215 | return -ENOMEM; |
1da177e4 LT |
1216 | *scontext = scontextp; |
1217 | ||
1218 | /* | |
1219 | * Copy the user name, role name and type name into the context. | |
1220 | */ | |
1221 | sprintf(scontextp, "%s:%s:%s", | |
ac76c05b EP |
1222 | sym_name(&policydb, SYM_USERS, context->user - 1), |
1223 | sym_name(&policydb, SYM_ROLES, context->role - 1), | |
1224 | sym_name(&policydb, SYM_TYPES, context->type - 1)); | |
1225 | scontextp += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + | |
1226 | 1 + strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + | |
1227 | 1 + strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)); | |
1da177e4 LT |
1228 | |
1229 | mls_sid_to_context(context, &scontextp); | |
1230 | ||
1231 | *scontextp = 0; | |
1232 | ||
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | #include "initial_sid_to_string.h" | |
1237 | ||
f0ee2e46 JC |
1238 | const char *security_get_initial_sid_context(u32 sid) |
1239 | { | |
1240 | if (unlikely(sid > SECINITSID_NUM)) | |
1241 | return NULL; | |
1242 | return initial_sid_to_string[sid]; | |
1243 | } | |
1244 | ||
12b29f34 SS |
1245 | static int security_sid_to_context_core(u32 sid, char **scontext, |
1246 | u32 *scontext_len, int force) | |
1da177e4 LT |
1247 | { |
1248 | struct context *context; | |
1249 | int rc = 0; | |
1250 | ||
d5630b9d EP |
1251 | if (scontext) |
1252 | *scontext = NULL; | |
4f4acf3a SS |
1253 | *scontext_len = 0; |
1254 | ||
1da177e4 LT |
1255 | if (!ss_initialized) { |
1256 | if (sid <= SECINITSID_NUM) { | |
1257 | char *scontextp; | |
1258 | ||
1259 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
d5630b9d EP |
1260 | if (!scontext) |
1261 | goto out; | |
5d55a345 | 1262 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
0cccca06 SH |
1263 | if (!scontextp) { |
1264 | rc = -ENOMEM; | |
1265 | goto out; | |
1266 | } | |
1da177e4 LT |
1267 | strcpy(scontextp, initial_sid_to_string[sid]); |
1268 | *scontext = scontextp; | |
1269 | goto out; | |
1270 | } | |
744ba35e EP |
1271 | printk(KERN_ERR "SELinux: %s: called before initial " |
1272 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
1273 | rc = -EINVAL; |
1274 | goto out; | |
1275 | } | |
0804d113 | 1276 | read_lock(&policy_rwlock); |
12b29f34 SS |
1277 | if (force) |
1278 | context = sidtab_search_force(&sidtab, sid); | |
1279 | else | |
1280 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 1281 | if (!context) { |
744ba35e EP |
1282 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1283 | __func__, sid); | |
1da177e4 LT |
1284 | rc = -EINVAL; |
1285 | goto out_unlock; | |
1286 | } | |
1287 | rc = context_struct_to_string(context, scontext, scontext_len); | |
1288 | out_unlock: | |
0804d113 | 1289 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1290 | out: |
1291 | return rc; | |
1292 | ||
1293 | } | |
1294 | ||
12b29f34 SS |
1295 | /** |
1296 | * security_sid_to_context - Obtain a context for a given SID. | |
1297 | * @sid: security identifier, SID | |
1298 | * @scontext: security context | |
1299 | * @scontext_len: length in bytes | |
1300 | * | |
1301 | * Write the string representation of the context associated with @sid | |
1302 | * into a dynamically allocated string of the correct size. Set @scontext | |
1303 | * to point to this string and set @scontext_len to the length of the string. | |
1304 | */ | |
1305 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 1306 | { |
12b29f34 SS |
1307 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
1308 | } | |
1309 | ||
1310 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
1311 | { | |
1312 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
1313 | } | |
1314 | ||
9a59daa0 SS |
1315 | /* |
1316 | * Caveat: Mutates scontext. | |
1317 | */ | |
12b29f34 SS |
1318 | static int string_to_context_struct(struct policydb *pol, |
1319 | struct sidtab *sidtabp, | |
9a59daa0 | 1320 | char *scontext, |
12b29f34 SS |
1321 | u32 scontext_len, |
1322 | struct context *ctx, | |
9a59daa0 | 1323 | u32 def_sid) |
12b29f34 | 1324 | { |
1da177e4 LT |
1325 | struct role_datum *role; |
1326 | struct type_datum *typdatum; | |
1327 | struct user_datum *usrdatum; | |
1328 | char *scontextp, *p, oldc; | |
1329 | int rc = 0; | |
1330 | ||
12b29f34 | 1331 | context_init(ctx); |
1da177e4 | 1332 | |
1da177e4 LT |
1333 | /* Parse the security context. */ |
1334 | ||
1335 | rc = -EINVAL; | |
9a59daa0 | 1336 | scontextp = (char *) scontext; |
1da177e4 LT |
1337 | |
1338 | /* Extract the user. */ | |
1339 | p = scontextp; | |
1340 | while (*p && *p != ':') | |
1341 | p++; | |
1342 | ||
1343 | if (*p == 0) | |
12b29f34 | 1344 | goto out; |
1da177e4 LT |
1345 | |
1346 | *p++ = 0; | |
1347 | ||
12b29f34 | 1348 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1349 | if (!usrdatum) |
12b29f34 | 1350 | goto out; |
1da177e4 | 1351 | |
12b29f34 | 1352 | ctx->user = usrdatum->value; |
1da177e4 LT |
1353 | |
1354 | /* Extract role. */ | |
1355 | scontextp = p; | |
1356 | while (*p && *p != ':') | |
1357 | p++; | |
1358 | ||
1359 | if (*p == 0) | |
12b29f34 | 1360 | goto out; |
1da177e4 LT |
1361 | |
1362 | *p++ = 0; | |
1363 | ||
12b29f34 | 1364 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1365 | if (!role) |
12b29f34 SS |
1366 | goto out; |
1367 | ctx->role = role->value; | |
1da177e4 LT |
1368 | |
1369 | /* Extract type. */ | |
1370 | scontextp = p; | |
1371 | while (*p && *p != ':') | |
1372 | p++; | |
1373 | oldc = *p; | |
1374 | *p++ = 0; | |
1375 | ||
12b29f34 | 1376 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1377 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1378 | goto out; |
1da177e4 | 1379 | |
12b29f34 | 1380 | ctx->type = typdatum->value; |
1da177e4 | 1381 | |
12b29f34 | 1382 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 1383 | if (rc) |
12b29f34 | 1384 | goto out; |
1da177e4 | 1385 | |
4b02b524 EP |
1386 | rc = -EINVAL; |
1387 | if ((p - scontext) < scontext_len) | |
12b29f34 | 1388 | goto out; |
1da177e4 LT |
1389 | |
1390 | /* Check the validity of the new context. */ | |
4b02b524 | 1391 | if (!policydb_context_isvalid(pol, ctx)) |
12b29f34 | 1392 | goto out; |
12b29f34 SS |
1393 | rc = 0; |
1394 | out: | |
8e531af9 EP |
1395 | if (rc) |
1396 | context_destroy(ctx); | |
12b29f34 SS |
1397 | return rc; |
1398 | } | |
1399 | ||
1400 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
1401 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
1402 | int force) | |
1403 | { | |
9a59daa0 | 1404 | char *scontext2, *str = NULL; |
12b29f34 SS |
1405 | struct context context; |
1406 | int rc = 0; | |
1407 | ||
2172fa70 SS |
1408 | /* An empty security context is never valid. */ |
1409 | if (!scontext_len) | |
1410 | return -EINVAL; | |
1411 | ||
12b29f34 SS |
1412 | if (!ss_initialized) { |
1413 | int i; | |
1414 | ||
1415 | for (i = 1; i < SECINITSID_NUM; i++) { | |
1416 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
1417 | *sid = i; | |
9a59daa0 | 1418 | return 0; |
12b29f34 SS |
1419 | } |
1420 | } | |
1421 | *sid = SECINITSID_KERNEL; | |
9a59daa0 | 1422 | return 0; |
12b29f34 SS |
1423 | } |
1424 | *sid = SECSID_NULL; | |
1425 | ||
9a59daa0 | 1426 | /* Copy the string so that we can modify the copy as we parse it. */ |
c1a7368a | 1427 | scontext2 = kmalloc(scontext_len + 1, gfp_flags); |
9a59daa0 SS |
1428 | if (!scontext2) |
1429 | return -ENOMEM; | |
1430 | memcpy(scontext2, scontext, scontext_len); | |
1431 | scontext2[scontext_len] = 0; | |
1432 | ||
1433 | if (force) { | |
1434 | /* Save another copy for storing in uninterpreted form */ | |
4b02b524 | 1435 | rc = -ENOMEM; |
9a59daa0 | 1436 | str = kstrdup(scontext2, gfp_flags); |
4b02b524 EP |
1437 | if (!str) |
1438 | goto out; | |
9a59daa0 SS |
1439 | } |
1440 | ||
0804d113 | 1441 | read_lock(&policy_rwlock); |
4b02b524 EP |
1442 | rc = string_to_context_struct(&policydb, &sidtab, scontext2, |
1443 | scontext_len, &context, def_sid); | |
12b29f34 | 1444 | if (rc == -EINVAL && force) { |
9a59daa0 | 1445 | context.str = str; |
12b29f34 | 1446 | context.len = scontext_len; |
9a59daa0 | 1447 | str = NULL; |
12b29f34 | 1448 | } else if (rc) |
4b02b524 | 1449 | goto out_unlock; |
12b29f34 | 1450 | rc = sidtab_context_to_sid(&sidtab, &context, sid); |
8e531af9 | 1451 | context_destroy(&context); |
4b02b524 | 1452 | out_unlock: |
0804d113 | 1453 | read_unlock(&policy_rwlock); |
4b02b524 | 1454 | out: |
9a59daa0 SS |
1455 | kfree(scontext2); |
1456 | kfree(str); | |
1da177e4 LT |
1457 | return rc; |
1458 | } | |
1459 | ||
f5c1d5b2 JM |
1460 | /** |
1461 | * security_context_to_sid - Obtain a SID for a given security context. | |
1462 | * @scontext: security context | |
1463 | * @scontext_len: length in bytes | |
1464 | * @sid: security identifier, SID | |
52a4c640 | 1465 | * @gfp: context for the allocation |
f5c1d5b2 JM |
1466 | * |
1467 | * Obtains a SID associated with the security context that | |
1468 | * has the string representation specified by @scontext. | |
1469 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1470 | * memory is available, or 0 on success. | |
1471 | */ | |
52a4c640 NA |
1472 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid, |
1473 | gfp_t gfp) | |
f5c1d5b2 JM |
1474 | { |
1475 | return security_context_to_sid_core(scontext, scontext_len, | |
52a4c640 | 1476 | sid, SECSID_NULL, gfp, 0); |
f5c1d5b2 JM |
1477 | } |
1478 | ||
1479 | /** | |
1480 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1481 | * falling back to specified default if needed. | |
1482 | * | |
1483 | * @scontext: security context | |
1484 | * @scontext_len: length in bytes | |
1485 | * @sid: security identifier, SID | |
d133a960 | 1486 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1487 | * |
1488 | * Obtains a SID associated with the security context that | |
1489 | * has the string representation specified by @scontext. | |
1490 | * The default SID is passed to the MLS layer to be used to allow | |
1491 | * kernel labeling of the MLS field if the MLS field is not present | |
1492 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1493 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1494 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1495 | * memory is available, or 0 on success. | |
1496 | */ | |
7bf570dc DH |
1497 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1498 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1499 | { |
1500 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1501 | sid, def_sid, gfp_flags, 1); |
1502 | } | |
1503 | ||
1504 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1505 | u32 *sid) | |
1506 | { | |
1507 | return security_context_to_sid_core(scontext, scontext_len, | |
1508 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1509 | } |
1510 | ||
1da177e4 LT |
1511 | static int compute_sid_handle_invalid_context( |
1512 | struct context *scontext, | |
1513 | struct context *tcontext, | |
1514 | u16 tclass, | |
1515 | struct context *newcontext) | |
1516 | { | |
1517 | char *s = NULL, *t = NULL, *n = NULL; | |
1518 | u32 slen, tlen, nlen; | |
1519 | ||
4b02b524 | 1520 | if (context_struct_to_string(scontext, &s, &slen)) |
1da177e4 | 1521 | goto out; |
4b02b524 | 1522 | if (context_struct_to_string(tcontext, &t, &tlen)) |
1da177e4 | 1523 | goto out; |
4b02b524 | 1524 | if (context_struct_to_string(newcontext, &n, &nlen)) |
1da177e4 | 1525 | goto out; |
9ad9ad38 | 1526 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
4093a844 RGB |
1527 | "op=security_compute_sid invalid_context=%s" |
1528 | " scontext=%s" | |
1da177e4 LT |
1529 | " tcontext=%s" |
1530 | " tclass=%s", | |
ac76c05b | 1531 | n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); |
1da177e4 LT |
1532 | out: |
1533 | kfree(s); | |
1534 | kfree(t); | |
1535 | kfree(n); | |
1536 | if (!selinux_enforcing) | |
1537 | return 0; | |
1538 | return -EACCES; | |
1539 | } | |
1540 | ||
652bb9b0 | 1541 | static void filename_compute_type(struct policydb *p, struct context *newcontext, |
2667991f | 1542 | u32 stype, u32 ttype, u16 tclass, |
f50a3ec9 | 1543 | const char *objname) |
652bb9b0 | 1544 | { |
2463c26d EP |
1545 | struct filename_trans ft; |
1546 | struct filename_trans_datum *otype; | |
03a4c018 EP |
1547 | |
1548 | /* | |
1549 | * Most filename trans rules are going to live in specific directories | |
1550 | * like /dev or /var/run. This bitmap will quickly skip rule searches | |
1551 | * if the ttype does not contain any rules. | |
1552 | */ | |
1553 | if (!ebitmap_get_bit(&p->filename_trans_ttypes, ttype)) | |
1554 | return; | |
1555 | ||
2463c26d EP |
1556 | ft.stype = stype; |
1557 | ft.ttype = ttype; | |
1558 | ft.tclass = tclass; | |
1559 | ft.name = objname; | |
1560 | ||
1561 | otype = hashtab_search(p->filename_trans, &ft); | |
1562 | if (otype) | |
1563 | newcontext->type = otype->otype; | |
652bb9b0 EP |
1564 | } |
1565 | ||
1da177e4 LT |
1566 | static int security_compute_sid(u32 ssid, |
1567 | u32 tsid, | |
c6d3aaa4 | 1568 | u16 orig_tclass, |
1da177e4 | 1569 | u32 specified, |
f50a3ec9 | 1570 | const char *objname, |
c6d3aaa4 SS |
1571 | u32 *out_sid, |
1572 | bool kern) | |
1da177e4 | 1573 | { |
aa893269 | 1574 | struct class_datum *cladatum = NULL; |
1da177e4 LT |
1575 | struct context *scontext = NULL, *tcontext = NULL, newcontext; |
1576 | struct role_trans *roletr = NULL; | |
1577 | struct avtab_key avkey; | |
1578 | struct avtab_datum *avdatum; | |
1579 | struct avtab_node *node; | |
c6d3aaa4 | 1580 | u16 tclass; |
1da177e4 | 1581 | int rc = 0; |
6f5317e7 | 1582 | bool sock; |
1da177e4 LT |
1583 | |
1584 | if (!ss_initialized) { | |
c6d3aaa4 SS |
1585 | switch (orig_tclass) { |
1586 | case SECCLASS_PROCESS: /* kernel value */ | |
1da177e4 LT |
1587 | *out_sid = ssid; |
1588 | break; | |
1589 | default: | |
1590 | *out_sid = tsid; | |
1591 | break; | |
1592 | } | |
1593 | goto out; | |
1594 | } | |
1595 | ||
851f8a69 VY |
1596 | context_init(&newcontext); |
1597 | ||
0804d113 | 1598 | read_lock(&policy_rwlock); |
1da177e4 | 1599 | |
6f5317e7 | 1600 | if (kern) { |
c6d3aaa4 | 1601 | tclass = unmap_class(orig_tclass); |
6f5317e7 HC |
1602 | sock = security_is_socket_class(orig_tclass); |
1603 | } else { | |
c6d3aaa4 | 1604 | tclass = orig_tclass; |
6f5317e7 HC |
1605 | sock = security_is_socket_class(map_class(tclass)); |
1606 | } | |
c6d3aaa4 | 1607 | |
1da177e4 LT |
1608 | scontext = sidtab_search(&sidtab, ssid); |
1609 | if (!scontext) { | |
744ba35e EP |
1610 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1611 | __func__, ssid); | |
1da177e4 LT |
1612 | rc = -EINVAL; |
1613 | goto out_unlock; | |
1614 | } | |
1615 | tcontext = sidtab_search(&sidtab, tsid); | |
1616 | if (!tcontext) { | |
744ba35e EP |
1617 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1618 | __func__, tsid); | |
1da177e4 LT |
1619 | rc = -EINVAL; |
1620 | goto out_unlock; | |
1621 | } | |
1622 | ||
aa893269 EP |
1623 | if (tclass && tclass <= policydb.p_classes.nprim) |
1624 | cladatum = policydb.class_val_to_struct[tclass - 1]; | |
1625 | ||
1da177e4 LT |
1626 | /* Set the user identity. */ |
1627 | switch (specified) { | |
1628 | case AVTAB_TRANSITION: | |
1629 | case AVTAB_CHANGE: | |
aa893269 EP |
1630 | if (cladatum && cladatum->default_user == DEFAULT_TARGET) { |
1631 | newcontext.user = tcontext->user; | |
1632 | } else { | |
1633 | /* notice this gets both DEFAULT_SOURCE and unset */ | |
1634 | /* Use the process user identity. */ | |
1635 | newcontext.user = scontext->user; | |
1636 | } | |
1da177e4 LT |
1637 | break; |
1638 | case AVTAB_MEMBER: | |
1639 | /* Use the related object owner. */ | |
1640 | newcontext.user = tcontext->user; | |
1641 | break; | |
1642 | } | |
1643 | ||
aa893269 EP |
1644 | /* Set the role to default values. */ |
1645 | if (cladatum && cladatum->default_role == DEFAULT_SOURCE) { | |
1da177e4 | 1646 | newcontext.role = scontext->role; |
aa893269 EP |
1647 | } else if (cladatum && cladatum->default_role == DEFAULT_TARGET) { |
1648 | newcontext.role = tcontext->role; | |
1649 | } else { | |
1650 | if ((tclass == policydb.process_class) || (sock == true)) | |
1651 | newcontext.role = scontext->role; | |
1652 | else | |
1653 | newcontext.role = OBJECT_R_VAL; | |
1654 | } | |
1655 | ||
1656 | /* Set the type to default values. */ | |
eed7795d | 1657 | if (cladatum && cladatum->default_type == DEFAULT_SOURCE) { |
1da177e4 | 1658 | newcontext.type = scontext->type; |
eed7795d | 1659 | } else if (cladatum && cladatum->default_type == DEFAULT_TARGET) { |
1da177e4 | 1660 | newcontext.type = tcontext->type; |
eed7795d EP |
1661 | } else { |
1662 | if ((tclass == policydb.process_class) || (sock == true)) { | |
1663 | /* Use the type of process. */ | |
1664 | newcontext.type = scontext->type; | |
1665 | } else { | |
1666 | /* Use the type of the related object. */ | |
1667 | newcontext.type = tcontext->type; | |
1668 | } | |
1da177e4 LT |
1669 | } |
1670 | ||
1671 | /* Look for a type transition/member/change rule. */ | |
1672 | avkey.source_type = scontext->type; | |
1673 | avkey.target_type = tcontext->type; | |
1674 | avkey.target_class = tclass; | |
782ebb99 SS |
1675 | avkey.specified = specified; |
1676 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1677 | |
1678 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1679 | if (!avdatum) { |
782ebb99 | 1680 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1681 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1682 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1683 | avdatum = &node->datum; |
1684 | break; | |
1685 | } | |
1686 | } | |
1687 | } | |
1688 | ||
782ebb99 | 1689 | if (avdatum) { |
1da177e4 | 1690 | /* Use the type from the type transition/member/change rule. */ |
fa1aa143 | 1691 | newcontext.type = avdatum->u.data; |
1da177e4 LT |
1692 | } |
1693 | ||
4742600c | 1694 | /* if we have a objname this is a file trans check so check those rules */ |
f50a3ec9 | 1695 | if (objname) |
652bb9b0 | 1696 | filename_compute_type(&policydb, &newcontext, scontext->type, |
f50a3ec9 | 1697 | tcontext->type, tclass, objname); |
652bb9b0 | 1698 | |
1da177e4 | 1699 | /* Check for class-specific changes. */ |
63a312ca HC |
1700 | if (specified & AVTAB_TRANSITION) { |
1701 | /* Look for a role transition rule. */ | |
1702 | for (roletr = policydb.role_tr; roletr; roletr = roletr->next) { | |
1703 | if ((roletr->role == scontext->role) && | |
1704 | (roletr->type == tcontext->type) && | |
1705 | (roletr->tclass == tclass)) { | |
1706 | /* Use the role transition rule. */ | |
1707 | newcontext.role = roletr->new_role; | |
1708 | break; | |
1da177e4 LT |
1709 | } |
1710 | } | |
1da177e4 LT |
1711 | } |
1712 | ||
1713 | /* Set the MLS attributes. | |
1714 | This is done last because it may allocate memory. */ | |
6f5317e7 HC |
1715 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, |
1716 | &newcontext, sock); | |
1da177e4 LT |
1717 | if (rc) |
1718 | goto out_unlock; | |
1719 | ||
1720 | /* Check the validity of the context. */ | |
1721 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1722 | rc = compute_sid_handle_invalid_context(scontext, | |
1723 | tcontext, | |
1724 | tclass, | |
1725 | &newcontext); | |
1726 | if (rc) | |
1727 | goto out_unlock; | |
1728 | } | |
1729 | /* Obtain the sid for the context. */ | |
1730 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1731 | out_unlock: | |
0804d113 | 1732 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1733 | context_destroy(&newcontext); |
1734 | out: | |
1735 | return rc; | |
1736 | } | |
1737 | ||
1738 | /** | |
1739 | * security_transition_sid - Compute the SID for a new subject/object. | |
1740 | * @ssid: source security identifier | |
1741 | * @tsid: target security identifier | |
1742 | * @tclass: target security class | |
1743 | * @out_sid: security identifier for new subject/object | |
1744 | * | |
1745 | * Compute a SID to use for labeling a new subject or object in the | |
1746 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1747 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1748 | * if insufficient memory is available, or %0 if the new SID was | |
1749 | * computed successfully. | |
1750 | */ | |
652bb9b0 EP |
1751 | int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, |
1752 | const struct qstr *qstr, u32 *out_sid) | |
1da177e4 | 1753 | { |
c6d3aaa4 | 1754 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, |
f50a3ec9 | 1755 | qstr ? qstr->name : NULL, out_sid, true); |
c6d3aaa4 SS |
1756 | } |
1757 | ||
f50a3ec9 KK |
1758 | int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, |
1759 | const char *objname, u32 *out_sid) | |
c6d3aaa4 SS |
1760 | { |
1761 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, | |
f50a3ec9 | 1762 | objname, out_sid, false); |
1da177e4 LT |
1763 | } |
1764 | ||
1765 | /** | |
1766 | * security_member_sid - Compute the SID for member selection. | |
1767 | * @ssid: source security identifier | |
1768 | * @tsid: target security identifier | |
1769 | * @tclass: target security class | |
1770 | * @out_sid: security identifier for selected member | |
1771 | * | |
1772 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1773 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1774 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1775 | * if insufficient memory is available, or %0 if the SID was | |
1776 | * computed successfully. | |
1777 | */ | |
1778 | int security_member_sid(u32 ssid, | |
1779 | u32 tsid, | |
1780 | u16 tclass, | |
1781 | u32 *out_sid) | |
1782 | { | |
652bb9b0 EP |
1783 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, NULL, |
1784 | out_sid, false); | |
1da177e4 LT |
1785 | } |
1786 | ||
1787 | /** | |
1788 | * security_change_sid - Compute the SID for object relabeling. | |
1789 | * @ssid: source security identifier | |
1790 | * @tsid: target security identifier | |
1791 | * @tclass: target security class | |
1792 | * @out_sid: security identifier for selected member | |
1793 | * | |
1794 | * Compute a SID to use for relabeling an object of class @tclass | |
1795 | * based on a SID pair (@ssid, @tsid). | |
1796 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1797 | * if insufficient memory is available, or %0 if the SID was | |
1798 | * computed successfully. | |
1799 | */ | |
1800 | int security_change_sid(u32 ssid, | |
1801 | u32 tsid, | |
1802 | u16 tclass, | |
1803 | u32 *out_sid) | |
1804 | { | |
652bb9b0 EP |
1805 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL, |
1806 | out_sid, false); | |
b94c7e67 CS |
1807 | } |
1808 | ||
1da177e4 LT |
1809 | /* Clone the SID into the new SID table. */ |
1810 | static int clone_sid(u32 sid, | |
1811 | struct context *context, | |
1812 | void *arg) | |
1813 | { | |
1814 | struct sidtab *s = arg; | |
1815 | ||
42596eaf GT |
1816 | if (sid > SECINITSID_NUM) |
1817 | return sidtab_insert(s, sid, context); | |
1818 | else | |
1819 | return 0; | |
1da177e4 LT |
1820 | } |
1821 | ||
1822 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1823 | { | |
4b02b524 EP |
1824 | char *s; |
1825 | u32 len; | |
1da177e4 | 1826 | |
4b02b524 EP |
1827 | if (selinux_enforcing) |
1828 | return -EINVAL; | |
1829 | ||
1830 | if (!context_struct_to_string(context, &s, &len)) { | |
1831 | printk(KERN_WARNING "SELinux: Context %s would be invalid if enforcing\n", s); | |
1832 | kfree(s); | |
1da177e4 | 1833 | } |
4b02b524 | 1834 | return 0; |
1da177e4 LT |
1835 | } |
1836 | ||
1837 | struct convert_context_args { | |
1838 | struct policydb *oldp; | |
1839 | struct policydb *newp; | |
1840 | }; | |
1841 | ||
1842 | /* | |
1843 | * Convert the values in the security context | |
1844 | * structure `c' from the values specified | |
1845 | * in the policy `p->oldp' to the values specified | |
1846 | * in the policy `p->newp'. Verify that the | |
1847 | * context is valid under the new policy. | |
1848 | */ | |
1849 | static int convert_context(u32 key, | |
1850 | struct context *c, | |
1851 | void *p) | |
1852 | { | |
1853 | struct convert_context_args *args; | |
1854 | struct context oldc; | |
0719aaf5 GT |
1855 | struct ocontext *oc; |
1856 | struct mls_range *range; | |
1da177e4 LT |
1857 | struct role_datum *role; |
1858 | struct type_datum *typdatum; | |
1859 | struct user_datum *usrdatum; | |
1860 | char *s; | |
1861 | u32 len; | |
42596eaf GT |
1862 | int rc = 0; |
1863 | ||
1864 | if (key <= SECINITSID_NUM) | |
1865 | goto out; | |
1da177e4 LT |
1866 | |
1867 | args = p; | |
1868 | ||
12b29f34 SS |
1869 | if (c->str) { |
1870 | struct context ctx; | |
4b02b524 EP |
1871 | |
1872 | rc = -ENOMEM; | |
9a59daa0 | 1873 | s = kstrdup(c->str, GFP_KERNEL); |
4b02b524 | 1874 | if (!s) |
9a59daa0 | 1875 | goto out; |
4b02b524 | 1876 | |
9a59daa0 SS |
1877 | rc = string_to_context_struct(args->newp, NULL, s, |
1878 | c->len, &ctx, SECSID_NULL); | |
1879 | kfree(s); | |
12b29f34 | 1880 | if (!rc) { |
4b02b524 | 1881 | printk(KERN_INFO "SELinux: Context %s became valid (mapped).\n", |
12b29f34 SS |
1882 | c->str); |
1883 | /* Replace string with mapped representation. */ | |
1884 | kfree(c->str); | |
1885 | memcpy(c, &ctx, sizeof(*c)); | |
1886 | goto out; | |
1887 | } else if (rc == -EINVAL) { | |
1888 | /* Retain string representation for later mapping. */ | |
1889 | rc = 0; | |
1890 | goto out; | |
1891 | } else { | |
1892 | /* Other error condition, e.g. ENOMEM. */ | |
4b02b524 | 1893 | printk(KERN_ERR "SELinux: Unable to map context %s, rc = %d.\n", |
12b29f34 SS |
1894 | c->str, -rc); |
1895 | goto out; | |
1896 | } | |
1897 | } | |
1898 | ||
1da177e4 LT |
1899 | rc = context_cpy(&oldc, c); |
1900 | if (rc) | |
1901 | goto out; | |
1902 | ||
1da177e4 | 1903 | /* Convert the user. */ |
4b02b524 | 1904 | rc = -EINVAL; |
1da177e4 | 1905 | usrdatum = hashtab_search(args->newp->p_users.table, |
ac76c05b | 1906 | sym_name(args->oldp, SYM_USERS, c->user - 1)); |
5d55a345 | 1907 | if (!usrdatum) |
1da177e4 | 1908 | goto bad; |
1da177e4 LT |
1909 | c->user = usrdatum->value; |
1910 | ||
1911 | /* Convert the role. */ | |
4b02b524 | 1912 | rc = -EINVAL; |
1da177e4 | 1913 | role = hashtab_search(args->newp->p_roles.table, |
ac76c05b | 1914 | sym_name(args->oldp, SYM_ROLES, c->role - 1)); |
5d55a345 | 1915 | if (!role) |
1da177e4 | 1916 | goto bad; |
1da177e4 LT |
1917 | c->role = role->value; |
1918 | ||
1919 | /* Convert the type. */ | |
4b02b524 | 1920 | rc = -EINVAL; |
1da177e4 | 1921 | typdatum = hashtab_search(args->newp->p_types.table, |
ac76c05b | 1922 | sym_name(args->oldp, SYM_TYPES, c->type - 1)); |
5d55a345 | 1923 | if (!typdatum) |
1da177e4 | 1924 | goto bad; |
1da177e4 LT |
1925 | c->type = typdatum->value; |
1926 | ||
0719aaf5 GT |
1927 | /* Convert the MLS fields if dealing with MLS policies */ |
1928 | if (args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1929 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1930 | if (rc) | |
1931 | goto bad; | |
1932 | } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) { | |
1933 | /* | |
1934 | * Switching between MLS and non-MLS policy: | |
1935 | * free any storage used by the MLS fields in the | |
1936 | * context for all existing entries in the sidtab. | |
1937 | */ | |
1938 | mls_context_destroy(c); | |
1939 | } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1940 | /* | |
1941 | * Switching between non-MLS and MLS policy: | |
1942 | * ensure that the MLS fields of the context for all | |
1943 | * existing entries in the sidtab are filled in with a | |
1944 | * suitable default value, likely taken from one of the | |
1945 | * initial SIDs. | |
1946 | */ | |
1947 | oc = args->newp->ocontexts[OCON_ISID]; | |
1948 | while (oc && oc->sid[0] != SECINITSID_UNLABELED) | |
1949 | oc = oc->next; | |
4b02b524 | 1950 | rc = -EINVAL; |
0719aaf5 GT |
1951 | if (!oc) { |
1952 | printk(KERN_ERR "SELinux: unable to look up" | |
1953 | " the initial SIDs list\n"); | |
1954 | goto bad; | |
1955 | } | |
1956 | range = &oc->context[0].range; | |
1957 | rc = mls_range_set(c, range); | |
1958 | if (rc) | |
1959 | goto bad; | |
1960 | } | |
1da177e4 LT |
1961 | |
1962 | /* Check the validity of the new context. */ | |
1963 | if (!policydb_context_isvalid(args->newp, c)) { | |
1964 | rc = convert_context_handle_invalid_context(&oldc); | |
1965 | if (rc) | |
1966 | goto bad; | |
1967 | } | |
1968 | ||
1969 | context_destroy(&oldc); | |
4b02b524 | 1970 | |
12b29f34 | 1971 | rc = 0; |
1da177e4 LT |
1972 | out: |
1973 | return rc; | |
1974 | bad: | |
12b29f34 | 1975 | /* Map old representation to string and save it. */ |
4b02b524 EP |
1976 | rc = context_struct_to_string(&oldc, &s, &len); |
1977 | if (rc) | |
1978 | return rc; | |
1da177e4 | 1979 | context_destroy(&oldc); |
12b29f34 SS |
1980 | context_destroy(c); |
1981 | c->str = s; | |
1982 | c->len = len; | |
4b02b524 | 1983 | printk(KERN_INFO "SELinux: Context %s became invalid (unmapped).\n", |
12b29f34 SS |
1984 | c->str); |
1985 | rc = 0; | |
1da177e4 LT |
1986 | goto out; |
1987 | } | |
1988 | ||
3bb56b25 PM |
1989 | static void security_load_policycaps(void) |
1990 | { | |
1991 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1992 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1993 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1994 | POLICYDB_CAPABILITY_OPENPERM); | |
2be4d74f CP |
1995 | selinux_policycap_alwaysnetwork = ebitmap_get_bit(&policydb.policycaps, |
1996 | POLICYDB_CAPABILITY_ALWAYSNETWORK); | |
3bb56b25 PM |
1997 | } |
1998 | ||
e900a7d9 | 1999 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
2000 | |
2001 | /** | |
2002 | * security_load_policy - Load a security policy configuration. | |
2003 | * @data: binary policy data | |
2004 | * @len: length of data in bytes | |
2005 | * | |
2006 | * Load a new set of security policy configuration data, | |
2007 | * validate it and convert the SID table as necessary. | |
2008 | * This function will flush the access vector cache after | |
2009 | * loading the new policy. | |
2010 | */ | |
2011 | int security_load_policy(void *data, size_t len) | |
2012 | { | |
b5495b42 | 2013 | struct policydb *oldpolicydb, *newpolicydb; |
1da177e4 | 2014 | struct sidtab oldsidtab, newsidtab; |
c6d3aaa4 | 2015 | struct selinux_mapping *oldmap, *map = NULL; |
1da177e4 LT |
2016 | struct convert_context_args args; |
2017 | u32 seqno; | |
c6d3aaa4 | 2018 | u16 map_size; |
1da177e4 LT |
2019 | int rc = 0; |
2020 | struct policy_file file = { data, len }, *fp = &file; | |
2021 | ||
b5495b42 TG |
2022 | oldpolicydb = kzalloc(2 * sizeof(*oldpolicydb), GFP_KERNEL); |
2023 | if (!oldpolicydb) { | |
2024 | rc = -ENOMEM; | |
2025 | goto out; | |
2026 | } | |
2027 | newpolicydb = oldpolicydb + 1; | |
2028 | ||
1da177e4 LT |
2029 | if (!ss_initialized) { |
2030 | avtab_cache_init(); | |
a2000050 EP |
2031 | rc = policydb_read(&policydb, fp); |
2032 | if (rc) { | |
1da177e4 | 2033 | avtab_cache_destroy(); |
b5495b42 | 2034 | goto out; |
1da177e4 | 2035 | } |
a2000050 | 2036 | |
cee74f47 | 2037 | policydb.len = len; |
a2000050 EP |
2038 | rc = selinux_set_mapping(&policydb, secclass_map, |
2039 | ¤t_mapping, | |
2040 | ¤t_mapping_size); | |
2041 | if (rc) { | |
1da177e4 LT |
2042 | policydb_destroy(&policydb); |
2043 | avtab_cache_destroy(); | |
b5495b42 | 2044 | goto out; |
1da177e4 | 2045 | } |
a2000050 EP |
2046 | |
2047 | rc = policydb_load_isids(&policydb, &sidtab); | |
2048 | if (rc) { | |
b94c7e67 CS |
2049 | policydb_destroy(&policydb); |
2050 | avtab_cache_destroy(); | |
b5495b42 | 2051 | goto out; |
b94c7e67 | 2052 | } |
a2000050 | 2053 | |
3bb56b25 | 2054 | security_load_policycaps(); |
1da177e4 | 2055 | ss_initialized = 1; |
4c443d1b | 2056 | seqno = ++latest_granting; |
1da177e4 | 2057 | selinux_complete_init(); |
4c443d1b SS |
2058 | avc_ss_reset(seqno); |
2059 | selnl_notify_policyload(seqno); | |
11904167 | 2060 | selinux_status_update_policyload(seqno); |
7420ed23 | 2061 | selinux_netlbl_cache_invalidate(); |
342a0cff | 2062 | selinux_xfrm_notify_policyload(); |
b5495b42 | 2063 | goto out; |
1da177e4 LT |
2064 | } |
2065 | ||
2066 | #if 0 | |
2067 | sidtab_hash_eval(&sidtab, "sids"); | |
2068 | #endif | |
2069 | ||
b5495b42 | 2070 | rc = policydb_read(newpolicydb, fp); |
a2000050 | 2071 | if (rc) |
b5495b42 | 2072 | goto out; |
1da177e4 | 2073 | |
b5495b42 | 2074 | newpolicydb->len = len; |
0719aaf5 | 2075 | /* If switching between different policy types, log MLS status */ |
b5495b42 | 2076 | if (policydb.mls_enabled && !newpolicydb->mls_enabled) |
0719aaf5 | 2077 | printk(KERN_INFO "SELinux: Disabling MLS support...\n"); |
b5495b42 | 2078 | else if (!policydb.mls_enabled && newpolicydb->mls_enabled) |
0719aaf5 GT |
2079 | printk(KERN_INFO "SELinux: Enabling MLS support...\n"); |
2080 | ||
b5495b42 | 2081 | rc = policydb_load_isids(newpolicydb, &newsidtab); |
42596eaf GT |
2082 | if (rc) { |
2083 | printk(KERN_ERR "SELinux: unable to load the initial SIDs\n"); | |
b5495b42 TG |
2084 | policydb_destroy(newpolicydb); |
2085 | goto out; | |
12b29f34 | 2086 | } |
1da177e4 | 2087 | |
b5495b42 | 2088 | rc = selinux_set_mapping(newpolicydb, secclass_map, &map, &map_size); |
a2000050 | 2089 | if (rc) |
b94c7e67 | 2090 | goto err; |
b94c7e67 | 2091 | |
b5495b42 | 2092 | rc = security_preserve_bools(newpolicydb); |
e900a7d9 | 2093 | if (rc) { |
454d972c | 2094 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
2095 | goto err; |
2096 | } | |
2097 | ||
1da177e4 LT |
2098 | /* Clone the SID table. */ |
2099 | sidtab_shutdown(&sidtab); | |
a2000050 EP |
2100 | |
2101 | rc = sidtab_map(&sidtab, clone_sid, &newsidtab); | |
2102 | if (rc) | |
1da177e4 | 2103 | goto err; |
1da177e4 | 2104 | |
12b29f34 SS |
2105 | /* |
2106 | * Convert the internal representations of contexts | |
2107 | * in the new SID table. | |
2108 | */ | |
1da177e4 | 2109 | args.oldp = &policydb; |
b5495b42 | 2110 | args.newp = newpolicydb; |
12b29f34 | 2111 | rc = sidtab_map(&newsidtab, convert_context, &args); |
0719aaf5 GT |
2112 | if (rc) { |
2113 | printk(KERN_ERR "SELinux: unable to convert the internal" | |
2114 | " representation of contexts in the new SID" | |
2115 | " table\n"); | |
12b29f34 | 2116 | goto err; |
0719aaf5 | 2117 | } |
1da177e4 LT |
2118 | |
2119 | /* Save the old policydb and SID table to free later. */ | |
b5495b42 | 2120 | memcpy(oldpolicydb, &policydb, sizeof(policydb)); |
1da177e4 LT |
2121 | sidtab_set(&oldsidtab, &sidtab); |
2122 | ||
2123 | /* Install the new policydb and SID table. */ | |
0804d113 | 2124 | write_lock_irq(&policy_rwlock); |
b5495b42 | 2125 | memcpy(&policydb, newpolicydb, sizeof(policydb)); |
1da177e4 | 2126 | sidtab_set(&sidtab, &newsidtab); |
3bb56b25 | 2127 | security_load_policycaps(); |
c6d3aaa4 SS |
2128 | oldmap = current_mapping; |
2129 | current_mapping = map; | |
2130 | current_mapping_size = map_size; | |
1da177e4 | 2131 | seqno = ++latest_granting; |
0804d113 | 2132 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2133 | |
2134 | /* Free the old policydb and SID table. */ | |
b5495b42 | 2135 | policydb_destroy(oldpolicydb); |
1da177e4 | 2136 | sidtab_destroy(&oldsidtab); |
c6d3aaa4 | 2137 | kfree(oldmap); |
1da177e4 LT |
2138 | |
2139 | avc_ss_reset(seqno); | |
2140 | selnl_notify_policyload(seqno); | |
11904167 | 2141 | selinux_status_update_policyload(seqno); |
7420ed23 | 2142 | selinux_netlbl_cache_invalidate(); |
342a0cff | 2143 | selinux_xfrm_notify_policyload(); |
1da177e4 | 2144 | |
b5495b42 TG |
2145 | rc = 0; |
2146 | goto out; | |
1da177e4 LT |
2147 | |
2148 | err: | |
c6d3aaa4 | 2149 | kfree(map); |
1da177e4 | 2150 | sidtab_destroy(&newsidtab); |
b5495b42 | 2151 | policydb_destroy(newpolicydb); |
1da177e4 | 2152 | |
b5495b42 TG |
2153 | out: |
2154 | kfree(oldpolicydb); | |
2155 | return rc; | |
1da177e4 LT |
2156 | } |
2157 | ||
cee74f47 EP |
2158 | size_t security_policydb_len(void) |
2159 | { | |
2160 | size_t len; | |
2161 | ||
2162 | read_lock(&policy_rwlock); | |
2163 | len = policydb.len; | |
2164 | read_unlock(&policy_rwlock); | |
2165 | ||
2166 | return len; | |
2167 | } | |
2168 | ||
1da177e4 LT |
2169 | /** |
2170 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
2171 | * @protocol: protocol number |
2172 | * @port: port number | |
2173 | * @out_sid: security identifier | |
2174 | */ | |
3e112172 | 2175 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
2176 | { |
2177 | struct ocontext *c; | |
2178 | int rc = 0; | |
2179 | ||
0804d113 | 2180 | read_lock(&policy_rwlock); |
1da177e4 LT |
2181 | |
2182 | c = policydb.ocontexts[OCON_PORT]; | |
2183 | while (c) { | |
2184 | if (c->u.port.protocol == protocol && | |
2185 | c->u.port.low_port <= port && | |
2186 | c->u.port.high_port >= port) | |
2187 | break; | |
2188 | c = c->next; | |
2189 | } | |
2190 | ||
2191 | if (c) { | |
2192 | if (!c->sid[0]) { | |
2193 | rc = sidtab_context_to_sid(&sidtab, | |
2194 | &c->context[0], | |
2195 | &c->sid[0]); | |
2196 | if (rc) | |
2197 | goto out; | |
2198 | } | |
2199 | *out_sid = c->sid[0]; | |
2200 | } else { | |
2201 | *out_sid = SECINITSID_PORT; | |
2202 | } | |
2203 | ||
2204 | out: | |
0804d113 | 2205 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2206 | return rc; |
2207 | } | |
2208 | ||
2209 | /** | |
2210 | * security_netif_sid - Obtain the SID for a network interface. | |
2211 | * @name: interface name | |
2212 | * @if_sid: interface SID | |
1da177e4 | 2213 | */ |
e8bfdb9d | 2214 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
2215 | { |
2216 | int rc = 0; | |
2217 | struct ocontext *c; | |
2218 | ||
0804d113 | 2219 | read_lock(&policy_rwlock); |
1da177e4 LT |
2220 | |
2221 | c = policydb.ocontexts[OCON_NETIF]; | |
2222 | while (c) { | |
2223 | if (strcmp(name, c->u.name) == 0) | |
2224 | break; | |
2225 | c = c->next; | |
2226 | } | |
2227 | ||
2228 | if (c) { | |
2229 | if (!c->sid[0] || !c->sid[1]) { | |
2230 | rc = sidtab_context_to_sid(&sidtab, | |
2231 | &c->context[0], | |
2232 | &c->sid[0]); | |
2233 | if (rc) | |
2234 | goto out; | |
2235 | rc = sidtab_context_to_sid(&sidtab, | |
2236 | &c->context[1], | |
2237 | &c->sid[1]); | |
2238 | if (rc) | |
2239 | goto out; | |
2240 | } | |
2241 | *if_sid = c->sid[0]; | |
e8bfdb9d | 2242 | } else |
1da177e4 | 2243 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
2244 | |
2245 | out: | |
0804d113 | 2246 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2247 | return rc; |
2248 | } | |
2249 | ||
2250 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
2251 | { | |
2252 | int i, fail = 0; | |
2253 | ||
5d55a345 EP |
2254 | for (i = 0; i < 4; i++) |
2255 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
2256 | fail = 1; |
2257 | break; | |
2258 | } | |
2259 | ||
2260 | return !fail; | |
2261 | } | |
2262 | ||
2263 | /** | |
2264 | * security_node_sid - Obtain the SID for a node (host). | |
2265 | * @domain: communication domain aka address family | |
2266 | * @addrp: address | |
2267 | * @addrlen: address length in bytes | |
2268 | * @out_sid: security identifier | |
2269 | */ | |
2270 | int security_node_sid(u16 domain, | |
2271 | void *addrp, | |
2272 | u32 addrlen, | |
2273 | u32 *out_sid) | |
2274 | { | |
4b02b524 | 2275 | int rc; |
1da177e4 LT |
2276 | struct ocontext *c; |
2277 | ||
0804d113 | 2278 | read_lock(&policy_rwlock); |
1da177e4 LT |
2279 | |
2280 | switch (domain) { | |
2281 | case AF_INET: { | |
2282 | u32 addr; | |
2283 | ||
4b02b524 EP |
2284 | rc = -EINVAL; |
2285 | if (addrlen != sizeof(u32)) | |
1da177e4 | 2286 | goto out; |
1da177e4 LT |
2287 | |
2288 | addr = *((u32 *)addrp); | |
2289 | ||
2290 | c = policydb.ocontexts[OCON_NODE]; | |
2291 | while (c) { | |
2292 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
2293 | break; | |
2294 | c = c->next; | |
2295 | } | |
2296 | break; | |
2297 | } | |
2298 | ||
2299 | case AF_INET6: | |
4b02b524 EP |
2300 | rc = -EINVAL; |
2301 | if (addrlen != sizeof(u64) * 2) | |
1da177e4 | 2302 | goto out; |
1da177e4 LT |
2303 | c = policydb.ocontexts[OCON_NODE6]; |
2304 | while (c) { | |
2305 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
2306 | c->u.node6.mask)) | |
2307 | break; | |
2308 | c = c->next; | |
2309 | } | |
2310 | break; | |
2311 | ||
2312 | default: | |
4b02b524 | 2313 | rc = 0; |
1da177e4 LT |
2314 | *out_sid = SECINITSID_NODE; |
2315 | goto out; | |
2316 | } | |
2317 | ||
2318 | if (c) { | |
2319 | if (!c->sid[0]) { | |
2320 | rc = sidtab_context_to_sid(&sidtab, | |
2321 | &c->context[0], | |
2322 | &c->sid[0]); | |
2323 | if (rc) | |
2324 | goto out; | |
2325 | } | |
2326 | *out_sid = c->sid[0]; | |
2327 | } else { | |
2328 | *out_sid = SECINITSID_NODE; | |
2329 | } | |
2330 | ||
4b02b524 | 2331 | rc = 0; |
1da177e4 | 2332 | out: |
0804d113 | 2333 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2334 | return rc; |
2335 | } | |
2336 | ||
2337 | #define SIDS_NEL 25 | |
2338 | ||
2339 | /** | |
2340 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
2341 | * @fromsid: starting SID | |
2342 | * @username: username | |
2343 | * @sids: array of reachable SIDs for user | |
2344 | * @nel: number of elements in @sids | |
2345 | * | |
2346 | * Generate the set of SIDs for legal security contexts | |
2347 | * for a given user that can be reached by @fromsid. | |
2348 | * Set *@sids to point to a dynamically allocated | |
2349 | * array containing the set of SIDs. Set *@nel to the | |
2350 | * number of elements in the array. | |
2351 | */ | |
2352 | ||
2353 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 2354 | char *username, |
1da177e4 LT |
2355 | u32 **sids, |
2356 | u32 *nel) | |
2357 | { | |
2358 | struct context *fromcon, usercon; | |
2c3c05db | 2359 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
2360 | u32 mynel = 0, maxnel = SIDS_NEL; |
2361 | struct user_datum *user; | |
2362 | struct role_datum *role; | |
782ebb99 | 2363 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
2364 | int rc = 0, i, j; |
2365 | ||
2c3c05db SS |
2366 | *sids = NULL; |
2367 | *nel = 0; | |
2368 | ||
2369 | if (!ss_initialized) | |
1da177e4 | 2370 | goto out; |
1da177e4 | 2371 | |
0804d113 | 2372 | read_lock(&policy_rwlock); |
1da177e4 | 2373 | |
12b29f34 SS |
2374 | context_init(&usercon); |
2375 | ||
4b02b524 | 2376 | rc = -EINVAL; |
1da177e4 | 2377 | fromcon = sidtab_search(&sidtab, fromsid); |
4b02b524 | 2378 | if (!fromcon) |
1da177e4 | 2379 | goto out_unlock; |
1da177e4 | 2380 | |
4b02b524 | 2381 | rc = -EINVAL; |
1da177e4 | 2382 | user = hashtab_search(policydb.p_users.table, username); |
4b02b524 | 2383 | if (!user) |
1da177e4 | 2384 | goto out_unlock; |
4b02b524 | 2385 | |
1da177e4 LT |
2386 | usercon.user = user->value; |
2387 | ||
4b02b524 | 2388 | rc = -ENOMEM; |
89d155ef | 2389 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
4b02b524 | 2390 | if (!mysids) |
1da177e4 | 2391 | goto out_unlock; |
1da177e4 | 2392 | |
9fe79ad1 | 2393 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 | 2394 | role = policydb.role_val_to_struct[i]; |
c1a7368a | 2395 | usercon.role = i + 1; |
9fe79ad1 | 2396 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
c1a7368a | 2397 | usercon.type = j + 1; |
1da177e4 LT |
2398 | |
2399 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
2400 | continue; | |
2401 | ||
1da177e4 | 2402 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 2403 | if (rc) |
1da177e4 | 2404 | goto out_unlock; |
1da177e4 LT |
2405 | if (mynel < maxnel) { |
2406 | mysids[mynel++] = sid; | |
2407 | } else { | |
4b02b524 | 2408 | rc = -ENOMEM; |
1da177e4 | 2409 | maxnel += SIDS_NEL; |
89d155ef | 2410 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
4b02b524 | 2411 | if (!mysids2) |
1da177e4 | 2412 | goto out_unlock; |
1da177e4 LT |
2413 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2414 | kfree(mysids); | |
2415 | mysids = mysids2; | |
2416 | mysids[mynel++] = sid; | |
2417 | } | |
2418 | } | |
2419 | } | |
4b02b524 | 2420 | rc = 0; |
1da177e4 | 2421 | out_unlock: |
0804d113 | 2422 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2423 | if (rc || !mynel) { |
2424 | kfree(mysids); | |
2425 | goto out; | |
2426 | } | |
2427 | ||
4b02b524 | 2428 | rc = -ENOMEM; |
2c3c05db SS |
2429 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); |
2430 | if (!mysids2) { | |
2c3c05db SS |
2431 | kfree(mysids); |
2432 | goto out; | |
2433 | } | |
2434 | for (i = 0, j = 0; i < mynel; i++) { | |
f01e1af4 | 2435 | struct av_decision dummy_avd; |
2c3c05db | 2436 | rc = avc_has_perm_noaudit(fromsid, mysids[i], |
c6d3aaa4 | 2437 | SECCLASS_PROCESS, /* kernel value */ |
2c3c05db | 2438 | PROCESS__TRANSITION, AVC_STRICT, |
f01e1af4 | 2439 | &dummy_avd); |
2c3c05db SS |
2440 | if (!rc) |
2441 | mysids2[j++] = mysids[i]; | |
2442 | cond_resched(); | |
2443 | } | |
2444 | rc = 0; | |
2445 | kfree(mysids); | |
2446 | *sids = mysids2; | |
2447 | *nel = j; | |
1da177e4 LT |
2448 | out: |
2449 | return rc; | |
2450 | } | |
2451 | ||
2452 | /** | |
f31e7994 | 2453 | * __security_genfs_sid - Helper to obtain a SID for a file in a filesystem |
1da177e4 LT |
2454 | * @fstype: filesystem type |
2455 | * @path: path from root of mount | |
2456 | * @sclass: file security class | |
2457 | * @sid: SID for path | |
2458 | * | |
2459 | * Obtain a SID to use for a file in a filesystem that | |
2460 | * cannot support xattr or use a fixed labeling behavior like | |
2461 | * transition SIDs or task SIDs. | |
f31e7994 WL |
2462 | * |
2463 | * The caller must acquire the policy_rwlock before calling this function. | |
1da177e4 | 2464 | */ |
f31e7994 WL |
2465 | static inline int __security_genfs_sid(const char *fstype, |
2466 | char *path, | |
2467 | u16 orig_sclass, | |
2468 | u32 *sid) | |
1da177e4 LT |
2469 | { |
2470 | int len; | |
c6d3aaa4 | 2471 | u16 sclass; |
1da177e4 LT |
2472 | struct genfs *genfs; |
2473 | struct ocontext *c; | |
4b02b524 | 2474 | int rc, cmp = 0; |
1da177e4 | 2475 | |
b1aa5301 SS |
2476 | while (path[0] == '/' && path[1] == '/') |
2477 | path++; | |
2478 | ||
c6d3aaa4 | 2479 | sclass = unmap_class(orig_sclass); |
4b02b524 | 2480 | *sid = SECINITSID_UNLABELED; |
c6d3aaa4 | 2481 | |
1da177e4 LT |
2482 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { |
2483 | cmp = strcmp(fstype, genfs->fstype); | |
2484 | if (cmp <= 0) | |
2485 | break; | |
2486 | } | |
2487 | ||
4b02b524 EP |
2488 | rc = -ENOENT; |
2489 | if (!genfs || cmp) | |
1da177e4 | 2490 | goto out; |
1da177e4 LT |
2491 | |
2492 | for (c = genfs->head; c; c = c->next) { | |
2493 | len = strlen(c->u.name); | |
2494 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2495 | (strncmp(c->u.name, path, len) == 0)) | |
2496 | break; | |
2497 | } | |
2498 | ||
4b02b524 EP |
2499 | rc = -ENOENT; |
2500 | if (!c) | |
1da177e4 | 2501 | goto out; |
1da177e4 LT |
2502 | |
2503 | if (!c->sid[0]) { | |
4b02b524 | 2504 | rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]); |
1da177e4 LT |
2505 | if (rc) |
2506 | goto out; | |
2507 | } | |
2508 | ||
2509 | *sid = c->sid[0]; | |
4b02b524 | 2510 | rc = 0; |
1da177e4 | 2511 | out: |
1da177e4 LT |
2512 | return rc; |
2513 | } | |
2514 | ||
f31e7994 WL |
2515 | /** |
2516 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2517 | * @fstype: filesystem type | |
2518 | * @path: path from root of mount | |
2519 | * @sclass: file security class | |
2520 | * @sid: SID for path | |
2521 | * | |
2522 | * Acquire policy_rwlock before calling __security_genfs_sid() and release | |
2523 | * it afterward. | |
2524 | */ | |
2525 | int security_genfs_sid(const char *fstype, | |
2526 | char *path, | |
2527 | u16 orig_sclass, | |
2528 | u32 *sid) | |
2529 | { | |
2530 | int retval; | |
2531 | ||
2532 | read_lock(&policy_rwlock); | |
2533 | retval = __security_genfs_sid(fstype, path, orig_sclass, sid); | |
2534 | read_unlock(&policy_rwlock); | |
2535 | return retval; | |
2536 | } | |
2537 | ||
1da177e4 LT |
2538 | /** |
2539 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
a64c54cf | 2540 | * @sb: superblock in question |
1da177e4 | 2541 | */ |
a64c54cf | 2542 | int security_fs_use(struct super_block *sb) |
1da177e4 LT |
2543 | { |
2544 | int rc = 0; | |
2545 | struct ocontext *c; | |
a64c54cf EP |
2546 | struct superblock_security_struct *sbsec = sb->s_security; |
2547 | const char *fstype = sb->s_type->name; | |
1da177e4 | 2548 | |
0804d113 | 2549 | read_lock(&policy_rwlock); |
1da177e4 | 2550 | |
4d546f81 PM |
2551 | c = policydb.ocontexts[OCON_FSUSE]; |
2552 | while (c) { | |
2553 | if (strcmp(fstype, c->u.name) == 0) | |
1da177e4 | 2554 | break; |
4d546f81 | 2555 | c = c->next; |
1da177e4 LT |
2556 | } |
2557 | ||
2558 | if (c) { | |
a64c54cf | 2559 | sbsec->behavior = c->v.behavior; |
1da177e4 | 2560 | if (!c->sid[0]) { |
4b02b524 | 2561 | rc = sidtab_context_to_sid(&sidtab, &c->context[0], |
1da177e4 LT |
2562 | &c->sid[0]); |
2563 | if (rc) | |
2564 | goto out; | |
2565 | } | |
a64c54cf | 2566 | sbsec->sid = c->sid[0]; |
1da177e4 | 2567 | } else { |
f31e7994 WL |
2568 | rc = __security_genfs_sid(fstype, "/", SECCLASS_DIR, |
2569 | &sbsec->sid); | |
089be43e | 2570 | if (rc) { |
a64c54cf | 2571 | sbsec->behavior = SECURITY_FS_USE_NONE; |
089be43e JM |
2572 | rc = 0; |
2573 | } else { | |
a64c54cf | 2574 | sbsec->behavior = SECURITY_FS_USE_GENFS; |
089be43e | 2575 | } |
1da177e4 LT |
2576 | } |
2577 | ||
2578 | out: | |
0804d113 | 2579 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2580 | return rc; |
2581 | } | |
2582 | ||
2583 | int security_get_bools(int *len, char ***names, int **values) | |
2584 | { | |
4b02b524 | 2585 | int i, rc; |
1da177e4 | 2586 | |
0804d113 | 2587 | read_lock(&policy_rwlock); |
1da177e4 LT |
2588 | *names = NULL; |
2589 | *values = NULL; | |
2590 | ||
4b02b524 | 2591 | rc = 0; |
1da177e4 | 2592 | *len = policydb.p_bools.nprim; |
4b02b524 | 2593 | if (!*len) |
1da177e4 | 2594 | goto out; |
1da177e4 | 2595 | |
4b02b524 EP |
2596 | rc = -ENOMEM; |
2597 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); | |
1da177e4 LT |
2598 | if (!*names) |
2599 | goto err; | |
1da177e4 | 2600 | |
4b02b524 EP |
2601 | rc = -ENOMEM; |
2602 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); | |
1da177e4 LT |
2603 | if (!*values) |
2604 | goto err; | |
2605 | ||
2606 | for (i = 0; i < *len; i++) { | |
2607 | size_t name_len; | |
4b02b524 | 2608 | |
1da177e4 | 2609 | (*values)[i] = policydb.bool_val_to_struct[i]->state; |
ac76c05b | 2610 | name_len = strlen(sym_name(&policydb, SYM_BOOLS, i)) + 1; |
4b02b524 EP |
2611 | |
2612 | rc = -ENOMEM; | |
2613 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); | |
1da177e4 LT |
2614 | if (!(*names)[i]) |
2615 | goto err; | |
4b02b524 | 2616 | |
ac76c05b | 2617 | strncpy((*names)[i], sym_name(&policydb, SYM_BOOLS, i), name_len); |
1da177e4 LT |
2618 | (*names)[i][name_len - 1] = 0; |
2619 | } | |
2620 | rc = 0; | |
2621 | out: | |
0804d113 | 2622 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2623 | return rc; |
2624 | err: | |
2625 | if (*names) { | |
2626 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2627 | kfree((*names)[i]); |
1da177e4 | 2628 | } |
9a5f04bf | 2629 | kfree(*values); |
1da177e4 LT |
2630 | goto out; |
2631 | } | |
2632 | ||
2633 | ||
2634 | int security_set_bools(int len, int *values) | |
2635 | { | |
4b02b524 | 2636 | int i, rc; |
1da177e4 LT |
2637 | int lenp, seqno = 0; |
2638 | struct cond_node *cur; | |
2639 | ||
0804d113 | 2640 | write_lock_irq(&policy_rwlock); |
1da177e4 | 2641 | |
4b02b524 | 2642 | rc = -EFAULT; |
1da177e4 | 2643 | lenp = policydb.p_bools.nprim; |
4b02b524 | 2644 | if (len != lenp) |
1da177e4 | 2645 | goto out; |
1da177e4 | 2646 | |
1da177e4 | 2647 | for (i = 0; i < len; i++) { |
af601e46 SG |
2648 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2649 | audit_log(current->audit_context, GFP_ATOMIC, | |
2650 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2651 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
ac76c05b | 2652 | sym_name(&policydb, SYM_BOOLS, i), |
af601e46 SG |
2653 | !!values[i], |
2654 | policydb.bool_val_to_struct[i]->state, | |
581abc09 | 2655 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 2656 | audit_get_sessionid(current)); |
af601e46 | 2657 | } |
5d55a345 | 2658 | if (values[i]) |
1da177e4 | 2659 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2660 | else |
1da177e4 | 2661 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2662 | } |
1da177e4 | 2663 | |
dbc74c65 | 2664 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2665 | rc = evaluate_cond_node(&policydb, cur); |
2666 | if (rc) | |
2667 | goto out; | |
2668 | } | |
2669 | ||
2670 | seqno = ++latest_granting; | |
4b02b524 | 2671 | rc = 0; |
1da177e4 | 2672 | out: |
0804d113 | 2673 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2674 | if (!rc) { |
2675 | avc_ss_reset(seqno); | |
2676 | selnl_notify_policyload(seqno); | |
11904167 | 2677 | selinux_status_update_policyload(seqno); |
342a0cff | 2678 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2679 | } |
2680 | return rc; | |
2681 | } | |
2682 | ||
2683 | int security_get_bool_value(int bool) | |
2684 | { | |
4b02b524 | 2685 | int rc; |
1da177e4 LT |
2686 | int len; |
2687 | ||
0804d113 | 2688 | read_lock(&policy_rwlock); |
1da177e4 | 2689 | |
4b02b524 | 2690 | rc = -EFAULT; |
1da177e4 | 2691 | len = policydb.p_bools.nprim; |
4b02b524 | 2692 | if (bool >= len) |
1da177e4 | 2693 | goto out; |
1da177e4 LT |
2694 | |
2695 | rc = policydb.bool_val_to_struct[bool]->state; | |
2696 | out: | |
0804d113 | 2697 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2698 | return rc; |
2699 | } | |
376bd9cb | 2700 | |
e900a7d9 SS |
2701 | static int security_preserve_bools(struct policydb *p) |
2702 | { | |
2703 | int rc, nbools = 0, *bvalues = NULL, i; | |
2704 | char **bnames = NULL; | |
2705 | struct cond_bool_datum *booldatum; | |
2706 | struct cond_node *cur; | |
2707 | ||
2708 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2709 | if (rc) | |
2710 | goto out; | |
2711 | for (i = 0; i < nbools; i++) { | |
2712 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2713 | if (booldatum) | |
2714 | booldatum->state = bvalues[i]; | |
2715 | } | |
dbc74c65 | 2716 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2717 | rc = evaluate_cond_node(p, cur); |
2718 | if (rc) | |
2719 | goto out; | |
2720 | } | |
2721 | ||
2722 | out: | |
2723 | if (bnames) { | |
2724 | for (i = 0; i < nbools; i++) | |
2725 | kfree(bnames[i]); | |
2726 | } | |
2727 | kfree(bnames); | |
2728 | kfree(bvalues); | |
2729 | return rc; | |
2730 | } | |
2731 | ||
08554d6b VY |
2732 | /* |
2733 | * security_sid_mls_copy() - computes a new sid based on the given | |
2734 | * sid and the mls portion of mls_sid. | |
2735 | */ | |
2736 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2737 | { | |
2738 | struct context *context1; | |
2739 | struct context *context2; | |
2740 | struct context newcon; | |
2741 | char *s; | |
2742 | u32 len; | |
4b02b524 | 2743 | int rc; |
08554d6b | 2744 | |
4b02b524 | 2745 | rc = 0; |
0719aaf5 | 2746 | if (!ss_initialized || !policydb.mls_enabled) { |
08554d6b VY |
2747 | *new_sid = sid; |
2748 | goto out; | |
2749 | } | |
2750 | ||
2751 | context_init(&newcon); | |
2752 | ||
0804d113 | 2753 | read_lock(&policy_rwlock); |
4b02b524 EP |
2754 | |
2755 | rc = -EINVAL; | |
08554d6b VY |
2756 | context1 = sidtab_search(&sidtab, sid); |
2757 | if (!context1) { | |
744ba35e EP |
2758 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2759 | __func__, sid); | |
08554d6b VY |
2760 | goto out_unlock; |
2761 | } | |
2762 | ||
4b02b524 | 2763 | rc = -EINVAL; |
08554d6b VY |
2764 | context2 = sidtab_search(&sidtab, mls_sid); |
2765 | if (!context2) { | |
744ba35e EP |
2766 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2767 | __func__, mls_sid); | |
08554d6b VY |
2768 | goto out_unlock; |
2769 | } | |
2770 | ||
2771 | newcon.user = context1->user; | |
2772 | newcon.role = context1->role; | |
2773 | newcon.type = context1->type; | |
0efc61ea | 2774 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2775 | if (rc) |
2776 | goto out_unlock; | |
2777 | ||
08554d6b VY |
2778 | /* Check the validity of the new context. */ |
2779 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2780 | rc = convert_context_handle_invalid_context(&newcon); | |
4b02b524 EP |
2781 | if (rc) { |
2782 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
4093a844 RGB |
2783 | audit_log(current->audit_context, |
2784 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2785 | "op=security_sid_mls_copy " | |
2786 | "invalid_context=%s", s); | |
4b02b524 EP |
2787 | kfree(s); |
2788 | } | |
2789 | goto out_unlock; | |
2790 | } | |
08554d6b VY |
2791 | } |
2792 | ||
2793 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
08554d6b | 2794 | out_unlock: |
0804d113 | 2795 | read_unlock(&policy_rwlock); |
08554d6b VY |
2796 | context_destroy(&newcon); |
2797 | out: | |
2798 | return rc; | |
2799 | } | |
2800 | ||
220deb96 PM |
2801 | /** |
2802 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2803 | * @nlbl_sid: NetLabel SID | |
2804 | * @nlbl_type: NetLabel labeling protocol type | |
2805 | * @xfrm_sid: XFRM SID | |
2806 | * | |
2807 | * Description: | |
2808 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2809 | * resolved into a single SID it is returned via @peer_sid and the function | |
2810 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2811 | * returns a negative value. A table summarizing the behavior is below: | |
2812 | * | |
2813 | * | function return | @sid | |
2814 | * ------------------------------+-----------------+----------------- | |
2815 | * no peer labels | 0 | SECSID_NULL | |
2816 | * single peer label | 0 | <peer_label> | |
2817 | * multiple, consistent labels | 0 | <peer_label> | |
2818 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2819 | * | |
2820 | */ | |
2821 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2822 | u32 xfrm_sid, | |
2823 | u32 *peer_sid) | |
2824 | { | |
2825 | int rc; | |
2826 | struct context *nlbl_ctx; | |
2827 | struct context *xfrm_ctx; | |
2828 | ||
4b02b524 EP |
2829 | *peer_sid = SECSID_NULL; |
2830 | ||
220deb96 PM |
2831 | /* handle the common (which also happens to be the set of easy) cases |
2832 | * right away, these two if statements catch everything involving a | |
2833 | * single or absent peer SID/label */ | |
2834 | if (xfrm_sid == SECSID_NULL) { | |
2835 | *peer_sid = nlbl_sid; | |
2836 | return 0; | |
2837 | } | |
2838 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2839 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2840 | * is present */ | |
2841 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2842 | *peer_sid = xfrm_sid; | |
2843 | return 0; | |
2844 | } | |
2845 | ||
2846 | /* we don't need to check ss_initialized here since the only way both | |
2847 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2848 | * security server was initialized and ss_initialized was true */ | |
4b02b524 | 2849 | if (!policydb.mls_enabled) |
220deb96 | 2850 | return 0; |
220deb96 | 2851 | |
0804d113 | 2852 | read_lock(&policy_rwlock); |
220deb96 | 2853 | |
4b02b524 | 2854 | rc = -EINVAL; |
220deb96 PM |
2855 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); |
2856 | if (!nlbl_ctx) { | |
744ba35e EP |
2857 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2858 | __func__, nlbl_sid); | |
4b02b524 | 2859 | goto out; |
220deb96 | 2860 | } |
4b02b524 | 2861 | rc = -EINVAL; |
220deb96 PM |
2862 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); |
2863 | if (!xfrm_ctx) { | |
744ba35e EP |
2864 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2865 | __func__, xfrm_sid); | |
4b02b524 | 2866 | goto out; |
220deb96 PM |
2867 | } |
2868 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
4b02b524 EP |
2869 | if (rc) |
2870 | goto out; | |
220deb96 | 2871 | |
4b02b524 EP |
2872 | /* at present NetLabel SIDs/labels really only carry MLS |
2873 | * information so if the MLS portion of the NetLabel SID | |
2874 | * matches the MLS portion of the labeled XFRM SID/label | |
2875 | * then pass along the XFRM SID as it is the most | |
2876 | * expressive */ | |
2877 | *peer_sid = xfrm_sid; | |
2878 | out: | |
0804d113 | 2879 | read_unlock(&policy_rwlock); |
220deb96 PM |
2880 | return rc; |
2881 | } | |
2882 | ||
55fcf09b CP |
2883 | static int get_classes_callback(void *k, void *d, void *args) |
2884 | { | |
2885 | struct class_datum *datum = d; | |
2886 | char *name = k, **classes = args; | |
2887 | int value = datum->value - 1; | |
2888 | ||
2889 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2890 | if (!classes[value]) | |
2891 | return -ENOMEM; | |
2892 | ||
2893 | return 0; | |
2894 | } | |
2895 | ||
2896 | int security_get_classes(char ***classes, int *nclasses) | |
2897 | { | |
4b02b524 | 2898 | int rc; |
55fcf09b | 2899 | |
0804d113 | 2900 | read_lock(&policy_rwlock); |
55fcf09b | 2901 | |
4b02b524 | 2902 | rc = -ENOMEM; |
55fcf09b | 2903 | *nclasses = policydb.p_classes.nprim; |
9f59f90b | 2904 | *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC); |
55fcf09b CP |
2905 | if (!*classes) |
2906 | goto out; | |
2907 | ||
2908 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2909 | *classes); | |
4b02b524 | 2910 | if (rc) { |
55fcf09b CP |
2911 | int i; |
2912 | for (i = 0; i < *nclasses; i++) | |
2913 | kfree((*classes)[i]); | |
2914 | kfree(*classes); | |
2915 | } | |
2916 | ||
2917 | out: | |
0804d113 | 2918 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2919 | return rc; |
2920 | } | |
2921 | ||
2922 | static int get_permissions_callback(void *k, void *d, void *args) | |
2923 | { | |
2924 | struct perm_datum *datum = d; | |
2925 | char *name = k, **perms = args; | |
2926 | int value = datum->value - 1; | |
2927 | ||
2928 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2929 | if (!perms[value]) | |
2930 | return -ENOMEM; | |
2931 | ||
2932 | return 0; | |
2933 | } | |
2934 | ||
2935 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2936 | { | |
4b02b524 | 2937 | int rc, i; |
55fcf09b CP |
2938 | struct class_datum *match; |
2939 | ||
0804d113 | 2940 | read_lock(&policy_rwlock); |
55fcf09b | 2941 | |
4b02b524 | 2942 | rc = -EINVAL; |
55fcf09b CP |
2943 | match = hashtab_search(policydb.p_classes.table, class); |
2944 | if (!match) { | |
744ba35e | 2945 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2946 | __func__, class); |
55fcf09b CP |
2947 | goto out; |
2948 | } | |
2949 | ||
4b02b524 | 2950 | rc = -ENOMEM; |
55fcf09b | 2951 | *nperms = match->permissions.nprim; |
9f59f90b | 2952 | *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC); |
55fcf09b CP |
2953 | if (!*perms) |
2954 | goto out; | |
2955 | ||
2956 | if (match->comdatum) { | |
2957 | rc = hashtab_map(match->comdatum->permissions.table, | |
2958 | get_permissions_callback, *perms); | |
4b02b524 | 2959 | if (rc) |
55fcf09b CP |
2960 | goto err; |
2961 | } | |
2962 | ||
2963 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2964 | *perms); | |
4b02b524 | 2965 | if (rc) |
55fcf09b CP |
2966 | goto err; |
2967 | ||
2968 | out: | |
0804d113 | 2969 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2970 | return rc; |
2971 | ||
2972 | err: | |
0804d113 | 2973 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2974 | for (i = 0; i < *nperms; i++) |
2975 | kfree((*perms)[i]); | |
2976 | kfree(*perms); | |
2977 | return rc; | |
2978 | } | |
2979 | ||
3f12070e EP |
2980 | int security_get_reject_unknown(void) |
2981 | { | |
2982 | return policydb.reject_unknown; | |
2983 | } | |
2984 | ||
2985 | int security_get_allow_unknown(void) | |
2986 | { | |
2987 | return policydb.allow_unknown; | |
2988 | } | |
2989 | ||
3bb56b25 PM |
2990 | /** |
2991 | * security_policycap_supported - Check for a specific policy capability | |
2992 | * @req_cap: capability | |
2993 | * | |
2994 | * Description: | |
2995 | * This function queries the currently loaded policy to see if it supports the | |
2996 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2997 | * supported, false (0) if it isn't supported. | |
2998 | * | |
2999 | */ | |
3000 | int security_policycap_supported(unsigned int req_cap) | |
3001 | { | |
3002 | int rc; | |
3003 | ||
0804d113 | 3004 | read_lock(&policy_rwlock); |
3bb56b25 | 3005 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 3006 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
3007 | |
3008 | return rc; | |
3009 | } | |
3010 | ||
376bd9cb DG |
3011 | struct selinux_audit_rule { |
3012 | u32 au_seqno; | |
3013 | struct context au_ctxt; | |
3014 | }; | |
3015 | ||
9d57a7f9 | 3016 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 3017 | { |
9d57a7f9 AD |
3018 | struct selinux_audit_rule *rule = vrule; |
3019 | ||
376bd9cb DG |
3020 | if (rule) { |
3021 | context_destroy(&rule->au_ctxt); | |
3022 | kfree(rule); | |
3023 | } | |
3024 | } | |
3025 | ||
9d57a7f9 | 3026 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
3027 | { |
3028 | struct selinux_audit_rule *tmprule; | |
3029 | struct role_datum *roledatum; | |
3030 | struct type_datum *typedatum; | |
3031 | struct user_datum *userdatum; | |
9d57a7f9 | 3032 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
3033 | int rc = 0; |
3034 | ||
3035 | *rule = NULL; | |
3036 | ||
3037 | if (!ss_initialized) | |
3ad40d64 | 3038 | return -EOPNOTSUPP; |
376bd9cb DG |
3039 | |
3040 | switch (field) { | |
3a6b9f85 DG |
3041 | case AUDIT_SUBJ_USER: |
3042 | case AUDIT_SUBJ_ROLE: | |
3043 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
3044 | case AUDIT_OBJ_USER: |
3045 | case AUDIT_OBJ_ROLE: | |
3046 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 3047 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 3048 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
3049 | return -EINVAL; |
3050 | break; | |
3a6b9f85 DG |
3051 | case AUDIT_SUBJ_SEN: |
3052 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3053 | case AUDIT_OBJ_LEV_LOW: |
3054 | case AUDIT_OBJ_LEV_HIGH: | |
25985edc | 3055 | /* we do not allow a range, indicated by the presence of '-' */ |
376bd9cb DG |
3056 | if (strchr(rulestr, '-')) |
3057 | return -EINVAL; | |
3058 | break; | |
3059 | default: | |
3060 | /* only the above fields are valid */ | |
3061 | return -EINVAL; | |
3062 | } | |
3063 | ||
3064 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
3065 | if (!tmprule) | |
3066 | return -ENOMEM; | |
3067 | ||
3068 | context_init(&tmprule->au_ctxt); | |
3069 | ||
0804d113 | 3070 | read_lock(&policy_rwlock); |
376bd9cb DG |
3071 | |
3072 | tmprule->au_seqno = latest_granting; | |
3073 | ||
3074 | switch (field) { | |
3a6b9f85 | 3075 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 3076 | case AUDIT_OBJ_USER: |
4b02b524 | 3077 | rc = -EINVAL; |
376bd9cb DG |
3078 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
3079 | if (!userdatum) | |
4b02b524 EP |
3080 | goto out; |
3081 | tmprule->au_ctxt.user = userdatum->value; | |
376bd9cb | 3082 | break; |
3a6b9f85 | 3083 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 3084 | case AUDIT_OBJ_ROLE: |
4b02b524 | 3085 | rc = -EINVAL; |
376bd9cb DG |
3086 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
3087 | if (!roledatum) | |
4b02b524 EP |
3088 | goto out; |
3089 | tmprule->au_ctxt.role = roledatum->value; | |
376bd9cb | 3090 | break; |
3a6b9f85 | 3091 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 3092 | case AUDIT_OBJ_TYPE: |
4b02b524 | 3093 | rc = -EINVAL; |
376bd9cb DG |
3094 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
3095 | if (!typedatum) | |
4b02b524 EP |
3096 | goto out; |
3097 | tmprule->au_ctxt.type = typedatum->value; | |
376bd9cb | 3098 | break; |
3a6b9f85 DG |
3099 | case AUDIT_SUBJ_SEN: |
3100 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3101 | case AUDIT_OBJ_LEV_LOW: |
3102 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb | 3103 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
4b02b524 EP |
3104 | if (rc) |
3105 | goto out; | |
376bd9cb DG |
3106 | break; |
3107 | } | |
4b02b524 EP |
3108 | rc = 0; |
3109 | out: | |
0804d113 | 3110 | read_unlock(&policy_rwlock); |
376bd9cb DG |
3111 | |
3112 | if (rc) { | |
3113 | selinux_audit_rule_free(tmprule); | |
3114 | tmprule = NULL; | |
3115 | } | |
3116 | ||
3117 | *rule = tmprule; | |
3118 | ||
3119 | return rc; | |
3120 | } | |
3121 | ||
9d57a7f9 AD |
3122 | /* Check to see if the rule contains any selinux fields */ |
3123 | int selinux_audit_rule_known(struct audit_krule *rule) | |
3124 | { | |
3125 | int i; | |
3126 | ||
3127 | for (i = 0; i < rule->field_count; i++) { | |
3128 | struct audit_field *f = &rule->fields[i]; | |
3129 | switch (f->type) { | |
3130 | case AUDIT_SUBJ_USER: | |
3131 | case AUDIT_SUBJ_ROLE: | |
3132 | case AUDIT_SUBJ_TYPE: | |
3133 | case AUDIT_SUBJ_SEN: | |
3134 | case AUDIT_SUBJ_CLR: | |
3135 | case AUDIT_OBJ_USER: | |
3136 | case AUDIT_OBJ_ROLE: | |
3137 | case AUDIT_OBJ_TYPE: | |
3138 | case AUDIT_OBJ_LEV_LOW: | |
3139 | case AUDIT_OBJ_LEV_HIGH: | |
3140 | return 1; | |
3141 | } | |
3142 | } | |
3143 | ||
3144 | return 0; | |
3145 | } | |
3146 | ||
3147 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 3148 | struct audit_context *actx) |
376bd9cb DG |
3149 | { |
3150 | struct context *ctxt; | |
3151 | struct mls_level *level; | |
9d57a7f9 | 3152 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
3153 | int match = 0; |
3154 | ||
9ad42a79 RGB |
3155 | if (unlikely(!rule)) { |
3156 | WARN_ONCE(1, "selinux_audit_rule_match: missing rule\n"); | |
376bd9cb DG |
3157 | return -ENOENT; |
3158 | } | |
3159 | ||
0804d113 | 3160 | read_lock(&policy_rwlock); |
376bd9cb DG |
3161 | |
3162 | if (rule->au_seqno < latest_granting) { | |
376bd9cb DG |
3163 | match = -ESTALE; |
3164 | goto out; | |
3165 | } | |
3166 | ||
9a2f44f0 | 3167 | ctxt = sidtab_search(&sidtab, sid); |
9ad42a79 RGB |
3168 | if (unlikely(!ctxt)) { |
3169 | WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n", | |
5d55a345 | 3170 | sid); |
376bd9cb DG |
3171 | match = -ENOENT; |
3172 | goto out; | |
3173 | } | |
3174 | ||
3175 | /* a field/op pair that is not caught here will simply fall through | |
3176 | without a match */ | |
3177 | switch (field) { | |
3a6b9f85 | 3178 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 3179 | case AUDIT_OBJ_USER: |
376bd9cb | 3180 | switch (op) { |
5af75d8d | 3181 | case Audit_equal: |
376bd9cb DG |
3182 | match = (ctxt->user == rule->au_ctxt.user); |
3183 | break; | |
5af75d8d | 3184 | case Audit_not_equal: |
376bd9cb DG |
3185 | match = (ctxt->user != rule->au_ctxt.user); |
3186 | break; | |
3187 | } | |
3188 | break; | |
3a6b9f85 | 3189 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 3190 | case AUDIT_OBJ_ROLE: |
376bd9cb | 3191 | switch (op) { |
5af75d8d | 3192 | case Audit_equal: |
376bd9cb DG |
3193 | match = (ctxt->role == rule->au_ctxt.role); |
3194 | break; | |
5af75d8d | 3195 | case Audit_not_equal: |
376bd9cb DG |
3196 | match = (ctxt->role != rule->au_ctxt.role); |
3197 | break; | |
3198 | } | |
3199 | break; | |
3a6b9f85 | 3200 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 3201 | case AUDIT_OBJ_TYPE: |
376bd9cb | 3202 | switch (op) { |
5af75d8d | 3203 | case Audit_equal: |
376bd9cb DG |
3204 | match = (ctxt->type == rule->au_ctxt.type); |
3205 | break; | |
5af75d8d | 3206 | case Audit_not_equal: |
376bd9cb DG |
3207 | match = (ctxt->type != rule->au_ctxt.type); |
3208 | break; | |
3209 | } | |
3210 | break; | |
3a6b9f85 DG |
3211 | case AUDIT_SUBJ_SEN: |
3212 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3213 | case AUDIT_OBJ_LEV_LOW: |
3214 | case AUDIT_OBJ_LEV_HIGH: | |
3215 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
3216 | field == AUDIT_OBJ_LEV_LOW) ? |
3217 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 3218 | switch (op) { |
5af75d8d | 3219 | case Audit_equal: |
376bd9cb | 3220 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3221 | level); |
376bd9cb | 3222 | break; |
5af75d8d | 3223 | case Audit_not_equal: |
376bd9cb | 3224 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3225 | level); |
376bd9cb | 3226 | break; |
5af75d8d | 3227 | case Audit_lt: |
376bd9cb | 3228 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
3229 | level) && |
3230 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
3231 | level)); | |
376bd9cb | 3232 | break; |
5af75d8d | 3233 | case Audit_le: |
376bd9cb | 3234 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 3235 | level); |
376bd9cb | 3236 | break; |
5af75d8d | 3237 | case Audit_gt: |
376bd9cb | 3238 | match = (mls_level_dom(level, |
5d55a345 EP |
3239 | &rule->au_ctxt.range.level[0]) && |
3240 | !mls_level_eq(level, | |
3241 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 3242 | break; |
5af75d8d | 3243 | case Audit_ge: |
376bd9cb | 3244 | match = mls_level_dom(level, |
5d55a345 | 3245 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
3246 | break; |
3247 | } | |
3248 | } | |
3249 | ||
3250 | out: | |
0804d113 | 3251 | read_unlock(&policy_rwlock); |
376bd9cb DG |
3252 | return match; |
3253 | } | |
3254 | ||
9d57a7f9 | 3255 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb | 3256 | |
562c99f2 | 3257 | static int aurule_avc_callback(u32 event) |
376bd9cb DG |
3258 | { |
3259 | int err = 0; | |
3260 | ||
3261 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
3262 | err = aurule_callback(); | |
3263 | return err; | |
3264 | } | |
3265 | ||
3266 | static int __init aurule_init(void) | |
3267 | { | |
3268 | int err; | |
3269 | ||
562c99f2 | 3270 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET); |
376bd9cb DG |
3271 | if (err) |
3272 | panic("avc_add_callback() failed, error %d\n", err); | |
3273 | ||
3274 | return err; | |
3275 | } | |
3276 | __initcall(aurule_init); | |
3277 | ||
7420ed23 | 3278 | #ifdef CONFIG_NETLABEL |
7420ed23 | 3279 | /** |
5778eabd PM |
3280 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
3281 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 3282 | * @sid: the SELinux SID |
7420ed23 VY |
3283 | * |
3284 | * Description: | |
3285 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
3286 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
3287 | * already been initialized. | |
7420ed23 VY |
3288 | * |
3289 | */ | |
5778eabd | 3290 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 3291 | u32 sid) |
7420ed23 | 3292 | { |
5dbe1eb0 | 3293 | u32 *sid_cache; |
7420ed23 | 3294 | |
5dbe1eb0 PM |
3295 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
3296 | if (sid_cache == NULL) | |
5778eabd | 3297 | return; |
5dbe1eb0 PM |
3298 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
3299 | if (secattr->cache == NULL) { | |
3300 | kfree(sid_cache); | |
5778eabd | 3301 | return; |
0ec8abd7 | 3302 | } |
7420ed23 | 3303 | |
5dbe1eb0 PM |
3304 | *sid_cache = sid; |
3305 | secattr->cache->free = kfree; | |
3306 | secattr->cache->data = sid_cache; | |
5778eabd | 3307 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
3308 | } |
3309 | ||
3310 | /** | |
5778eabd | 3311 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 3312 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
3313 | * @sid: the SELinux SID |
3314 | * | |
3315 | * Description: | |
5778eabd | 3316 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 3317 | * SELinux SID. If the @secattr field does not contain a full SELinux |
25985edc | 3318 | * SID/context then use SECINITSID_NETMSG as the foundation. If possible the |
5dbe1eb0 PM |
3319 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to |
3320 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
3321 | * conversion for future lookups. Returns zero on success, negative values on | |
3322 | * failure. | |
7420ed23 VY |
3323 | * |
3324 | */ | |
5778eabd | 3325 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 3326 | u32 *sid) |
7420ed23 | 3327 | { |
7ae9f23c | 3328 | int rc; |
7420ed23 VY |
3329 | struct context *ctx; |
3330 | struct context ctx_new; | |
5778eabd PM |
3331 | |
3332 | if (!ss_initialized) { | |
3333 | *sid = SECSID_NULL; | |
3334 | return 0; | |
3335 | } | |
7420ed23 | 3336 | |
0804d113 | 3337 | read_lock(&policy_rwlock); |
7420ed23 | 3338 | |
7ae9f23c | 3339 | if (secattr->flags & NETLBL_SECATTR_CACHE) |
5dbe1eb0 | 3340 | *sid = *(u32 *)secattr->cache->data; |
7ae9f23c | 3341 | else if (secattr->flags & NETLBL_SECATTR_SECID) |
16efd454 | 3342 | *sid = secattr->attr.secid; |
7ae9f23c EP |
3343 | else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
3344 | rc = -EIDRM; | |
5dbe1eb0 | 3345 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 | 3346 | if (ctx == NULL) |
7ae9f23c | 3347 | goto out; |
7420ed23 | 3348 | |
81990fbd | 3349 | context_init(&ctx_new); |
7420ed23 VY |
3350 | ctx_new.user = ctx->user; |
3351 | ctx_new.role = ctx->role; | |
3352 | ctx_new.type = ctx->type; | |
02752760 | 3353 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 3354 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
da8026fa | 3355 | rc = mls_import_netlbl_cat(&ctx_new, secattr); |
7ae9f23c EP |
3356 | if (rc) |
3357 | goto out; | |
7420ed23 | 3358 | } |
7ae9f23c EP |
3359 | rc = -EIDRM; |
3360 | if (!mls_context_isvalid(&policydb, &ctx_new)) | |
3361 | goto out_free; | |
7420ed23 VY |
3362 | |
3363 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
7ae9f23c EP |
3364 | if (rc) |
3365 | goto out_free; | |
7420ed23 | 3366 | |
5dbe1eb0 | 3367 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 3368 | |
7420ed23 | 3369 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c | 3370 | } else |
388b2405 | 3371 | *sid = SECSID_NULL; |
7420ed23 | 3372 | |
0804d113 | 3373 | read_unlock(&policy_rwlock); |
7ae9f23c EP |
3374 | return 0; |
3375 | out_free: | |
7420ed23 | 3376 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c EP |
3377 | out: |
3378 | read_unlock(&policy_rwlock); | |
3379 | return rc; | |
7420ed23 VY |
3380 | } |
3381 | ||
3382 | /** | |
5778eabd PM |
3383 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
3384 | * @sid: the SELinux SID | |
3385 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
3386 | * |
3387 | * Description: | |
5778eabd PM |
3388 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
3389 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
3390 | * |
3391 | */ | |
5778eabd | 3392 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 3393 | { |
99d854d2 | 3394 | int rc; |
7420ed23 VY |
3395 | struct context *ctx; |
3396 | ||
3397 | if (!ss_initialized) | |
3398 | return 0; | |
3399 | ||
0804d113 | 3400 | read_lock(&policy_rwlock); |
4b02b524 EP |
3401 | |
3402 | rc = -ENOENT; | |
7420ed23 | 3403 | ctx = sidtab_search(&sidtab, sid); |
4b02b524 EP |
3404 | if (ctx == NULL) |
3405 | goto out; | |
3406 | ||
3407 | rc = -ENOMEM; | |
ac76c05b | 3408 | secattr->domain = kstrdup(sym_name(&policydb, SYM_TYPES, ctx->type - 1), |
5778eabd | 3409 | GFP_ATOMIC); |
4b02b524 EP |
3410 | if (secattr->domain == NULL) |
3411 | goto out; | |
3412 | ||
8d75899d PM |
3413 | secattr->attr.secid = sid; |
3414 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
3415 | mls_export_netlbl_lvl(ctx, secattr); |
3416 | rc = mls_export_netlbl_cat(ctx, secattr); | |
4b02b524 | 3417 | out: |
0804d113 | 3418 | read_unlock(&policy_rwlock); |
f8687afe PM |
3419 | return rc; |
3420 | } | |
7420ed23 | 3421 | #endif /* CONFIG_NETLABEL */ |
cee74f47 EP |
3422 | |
3423 | /** | |
3424 | * security_read_policy - read the policy. | |
3425 | * @data: binary policy data | |
3426 | * @len: length of data in bytes | |
3427 | * | |
3428 | */ | |
6b697323 | 3429 | int security_read_policy(void **data, size_t *len) |
cee74f47 EP |
3430 | { |
3431 | int rc; | |
3432 | struct policy_file fp; | |
3433 | ||
3434 | if (!ss_initialized) | |
3435 | return -EINVAL; | |
3436 | ||
3437 | *len = security_policydb_len(); | |
3438 | ||
845ca30f | 3439 | *data = vmalloc_user(*len); |
cee74f47 EP |
3440 | if (!*data) |
3441 | return -ENOMEM; | |
3442 | ||
3443 | fp.data = *data; | |
3444 | fp.len = *len; | |
3445 | ||
3446 | read_lock(&policy_rwlock); | |
3447 | rc = policydb_write(&policydb, &fp); | |
3448 | read_unlock(&policy_rwlock); | |
3449 | ||
3450 | if (rc) | |
3451 | return rc; | |
3452 | ||
3453 | *len = (unsigned long)fp.data - (unsigned long)*data; | |
3454 | return 0; | |
3455 | ||
3456 | } |