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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5d55a345 | 5 | * James Morris <jmorris@redhat.com> |
1da177e4 LT |
6 | * |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
5d55a345 | 14 | * Added conditional policy language extensions |
1da177e4 | 15 | * |
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 | ||
f9df6458 AP |
781 | static int security_compute_validatetrans(u32 oldsid, u32 newsid, u32 tasksid, |
782 | u16 orig_tclass, bool user) | |
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 | |
f9df6458 AP |
797 | if (!user) |
798 | tclass = unmap_class(orig_tclass); | |
799 | else | |
800 | tclass = orig_tclass; | |
c6d3aaa4 | 801 | |
1da177e4 | 802 | if (!tclass || tclass > policydb.p_classes.nprim) { |
1da177e4 LT |
803 | rc = -EINVAL; |
804 | goto out; | |
805 | } | |
806 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
807 | ||
808 | ocontext = sidtab_search(&sidtab, oldsid); | |
809 | if (!ocontext) { | |
744ba35e EP |
810 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
811 | __func__, oldsid); | |
1da177e4 LT |
812 | rc = -EINVAL; |
813 | goto out; | |
814 | } | |
815 | ||
816 | ncontext = sidtab_search(&sidtab, newsid); | |
817 | if (!ncontext) { | |
744ba35e EP |
818 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
819 | __func__, newsid); | |
1da177e4 LT |
820 | rc = -EINVAL; |
821 | goto out; | |
822 | } | |
823 | ||
824 | tcontext = sidtab_search(&sidtab, tasksid); | |
825 | if (!tcontext) { | |
744ba35e EP |
826 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
827 | __func__, tasksid); | |
1da177e4 LT |
828 | rc = -EINVAL; |
829 | goto out; | |
830 | } | |
831 | ||
832 | constraint = tclass_datum->validatetrans; | |
833 | while (constraint) { | |
834 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 835 | constraint->expr)) { |
f9df6458 AP |
836 | if (user) |
837 | rc = -EPERM; | |
838 | else | |
839 | rc = security_validtrans_handle_fail(ocontext, | |
840 | ncontext, | |
841 | tcontext, | |
842 | tclass); | |
1da177e4 LT |
843 | goto out; |
844 | } | |
845 | constraint = constraint->next; | |
846 | } | |
847 | ||
848 | out: | |
0804d113 | 849 | read_unlock(&policy_rwlock); |
1da177e4 LT |
850 | return rc; |
851 | } | |
852 | ||
f9df6458 AP |
853 | int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid, |
854 | u16 tclass) | |
855 | { | |
856 | return security_compute_validatetrans(oldsid, newsid, tasksid, | |
857 | tclass, true); | |
858 | } | |
859 | ||
860 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
861 | u16 orig_tclass) | |
862 | { | |
863 | return security_compute_validatetrans(oldsid, newsid, tasksid, | |
864 | orig_tclass, false); | |
865 | } | |
866 | ||
d9250dea KK |
867 | /* |
868 | * security_bounded_transition - check whether the given | |
869 | * transition is directed to bounded, or not. | |
870 | * It returns 0, if @newsid is bounded by @oldsid. | |
871 | * Otherwise, it returns error code. | |
872 | * | |
873 | * @oldsid : current security identifier | |
874 | * @newsid : destinated security identifier | |
875 | */ | |
876 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
877 | { | |
878 | struct context *old_context, *new_context; | |
879 | struct type_datum *type; | |
880 | int index; | |
4b02b524 | 881 | int rc; |
d9250dea KK |
882 | |
883 | read_lock(&policy_rwlock); | |
884 | ||
4b02b524 | 885 | rc = -EINVAL; |
d9250dea KK |
886 | old_context = sidtab_search(&sidtab, old_sid); |
887 | if (!old_context) { | |
888 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
889 | __func__, old_sid); | |
890 | goto out; | |
891 | } | |
892 | ||
4b02b524 | 893 | rc = -EINVAL; |
d9250dea KK |
894 | new_context = sidtab_search(&sidtab, new_sid); |
895 | if (!new_context) { | |
896 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
897 | __func__, new_sid); | |
898 | goto out; | |
899 | } | |
900 | ||
4b02b524 | 901 | rc = 0; |
af901ca1 | 902 | /* type/domain unchanged */ |
4b02b524 | 903 | if (old_context->type == new_context->type) |
d9250dea | 904 | goto out; |
d9250dea KK |
905 | |
906 | index = new_context->type; | |
907 | while (true) { | |
23bdecb0 EP |
908 | type = flex_array_get_ptr(policydb.type_val_to_struct_array, |
909 | index - 1); | |
d9250dea KK |
910 | BUG_ON(!type); |
911 | ||
912 | /* not bounded anymore */ | |
4b02b524 EP |
913 | rc = -EPERM; |
914 | if (!type->bounds) | |
d9250dea | 915 | break; |
d9250dea KK |
916 | |
917 | /* @newsid is bounded by @oldsid */ | |
4b02b524 EP |
918 | rc = 0; |
919 | if (type->bounds == old_context->type) | |
d9250dea | 920 | break; |
4b02b524 | 921 | |
d9250dea KK |
922 | index = type->bounds; |
923 | } | |
44c2d9bd KK |
924 | |
925 | if (rc) { | |
926 | char *old_name = NULL; | |
927 | char *new_name = NULL; | |
2da5d31b | 928 | u32 length; |
44c2d9bd KK |
929 | |
930 | if (!context_struct_to_string(old_context, | |
931 | &old_name, &length) && | |
932 | !context_struct_to_string(new_context, | |
933 | &new_name, &length)) { | |
934 | audit_log(current->audit_context, | |
935 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
936 | "op=security_bounded_transition " | |
4093a844 | 937 | "seresult=denied " |
44c2d9bd KK |
938 | "oldcontext=%s newcontext=%s", |
939 | old_name, new_name); | |
940 | } | |
941 | kfree(new_name); | |
942 | kfree(old_name); | |
943 | } | |
d9250dea KK |
944 | out: |
945 | read_unlock(&policy_rwlock); | |
946 | ||
947 | return rc; | |
948 | } | |
949 | ||
19439d05 | 950 | static void avd_init(struct av_decision *avd) |
c6d3aaa4 | 951 | { |
19439d05 SS |
952 | avd->allowed = 0; |
953 | avd->auditallow = 0; | |
954 | avd->auditdeny = 0xffffffff; | |
955 | avd->seqno = latest_granting; | |
956 | avd->flags = 0; | |
c6d3aaa4 SS |
957 | } |
958 | ||
fa1aa143 JVS |
959 | void services_compute_xperms_decision(struct extended_perms_decision *xpermd, |
960 | struct avtab_node *node) | |
961 | { | |
962 | unsigned int i; | |
963 | ||
964 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
965 | if (xpermd->driver != node->datum.u.xperms->driver) | |
966 | return; | |
967 | } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
968 | if (!security_xperm_test(node->datum.u.xperms->perms.p, | |
969 | xpermd->driver)) | |
970 | return; | |
971 | } else { | |
972 | BUG(); | |
973 | } | |
974 | ||
975 | if (node->key.specified == AVTAB_XPERMS_ALLOWED) { | |
976 | xpermd->used |= XPERMS_ALLOWED; | |
977 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
978 | memset(xpermd->allowed->p, 0xff, | |
979 | sizeof(xpermd->allowed->p)); | |
980 | } | |
981 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
982 | for (i = 0; i < ARRAY_SIZE(xpermd->allowed->p); i++) | |
983 | xpermd->allowed->p[i] |= | |
984 | node->datum.u.xperms->perms.p[i]; | |
985 | } | |
986 | } else if (node->key.specified == AVTAB_XPERMS_AUDITALLOW) { | |
987 | xpermd->used |= XPERMS_AUDITALLOW; | |
988 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
989 | memset(xpermd->auditallow->p, 0xff, | |
990 | sizeof(xpermd->auditallow->p)); | |
991 | } | |
992 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
993 | for (i = 0; i < ARRAY_SIZE(xpermd->auditallow->p); i++) | |
994 | xpermd->auditallow->p[i] |= | |
995 | node->datum.u.xperms->perms.p[i]; | |
996 | } | |
997 | } else if (node->key.specified == AVTAB_XPERMS_DONTAUDIT) { | |
998 | xpermd->used |= XPERMS_DONTAUDIT; | |
999 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
1000 | memset(xpermd->dontaudit->p, 0xff, | |
1001 | sizeof(xpermd->dontaudit->p)); | |
1002 | } | |
1003 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
1004 | for (i = 0; i < ARRAY_SIZE(xpermd->dontaudit->p); i++) | |
1005 | xpermd->dontaudit->p[i] |= | |
1006 | node->datum.u.xperms->perms.p[i]; | |
1007 | } | |
1008 | } else { | |
1009 | BUG(); | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | void security_compute_xperms_decision(u32 ssid, | |
1014 | u32 tsid, | |
1015 | u16 orig_tclass, | |
1016 | u8 driver, | |
1017 | struct extended_perms_decision *xpermd) | |
1018 | { | |
1019 | u16 tclass; | |
1020 | struct context *scontext, *tcontext; | |
1021 | struct avtab_key avkey; | |
1022 | struct avtab_node *node; | |
1023 | struct ebitmap *sattr, *tattr; | |
1024 | struct ebitmap_node *snode, *tnode; | |
1025 | unsigned int i, j; | |
1026 | ||
1027 | xpermd->driver = driver; | |
1028 | xpermd->used = 0; | |
1029 | memset(xpermd->allowed->p, 0, sizeof(xpermd->allowed->p)); | |
1030 | memset(xpermd->auditallow->p, 0, sizeof(xpermd->auditallow->p)); | |
1031 | memset(xpermd->dontaudit->p, 0, sizeof(xpermd->dontaudit->p)); | |
1032 | ||
1033 | read_lock(&policy_rwlock); | |
1034 | if (!ss_initialized) | |
1035 | goto allow; | |
1036 | ||
1037 | scontext = sidtab_search(&sidtab, ssid); | |
1038 | if (!scontext) { | |
1039 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1040 | __func__, ssid); | |
1041 | goto out; | |
1042 | } | |
1043 | ||
1044 | tcontext = sidtab_search(&sidtab, tsid); | |
1045 | if (!tcontext) { | |
1046 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1047 | __func__, tsid); | |
1048 | goto out; | |
1049 | } | |
1050 | ||
1051 | tclass = unmap_class(orig_tclass); | |
1052 | if (unlikely(orig_tclass && !tclass)) { | |
1053 | if (policydb.allow_unknown) | |
1054 | goto allow; | |
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | ||
1059 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { | |
1060 | pr_warn_ratelimited("SELinux: Invalid class %hu\n", tclass); | |
1061 | goto out; | |
1062 | } | |
1063 | ||
1064 | avkey.target_class = tclass; | |
1065 | avkey.specified = AVTAB_XPERMS; | |
1066 | sattr = flex_array_get(policydb.type_attr_map_array, | |
1067 | scontext->type - 1); | |
1068 | BUG_ON(!sattr); | |
1069 | tattr = flex_array_get(policydb.type_attr_map_array, | |
1070 | tcontext->type - 1); | |
1071 | BUG_ON(!tattr); | |
1072 | ebitmap_for_each_positive_bit(sattr, snode, i) { | |
1073 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
1074 | avkey.source_type = i + 1; | |
1075 | avkey.target_type = j + 1; | |
1076 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
1077 | node; | |
1078 | node = avtab_search_node_next(node, avkey.specified)) | |
1079 | services_compute_xperms_decision(xpermd, node); | |
1080 | ||
1081 | cond_compute_xperms(&policydb.te_cond_avtab, | |
1082 | &avkey, xpermd); | |
1083 | } | |
1084 | } | |
1085 | out: | |
1086 | read_unlock(&policy_rwlock); | |
1087 | return; | |
1088 | allow: | |
1089 | memset(xpermd->allowed->p, 0xff, sizeof(xpermd->allowed->p)); | |
1090 | goto out; | |
1091 | } | |
19439d05 | 1092 | |
1da177e4 LT |
1093 | /** |
1094 | * security_compute_av - Compute access vector decisions. | |
1095 | * @ssid: source security identifier | |
1096 | * @tsid: target security identifier | |
1097 | * @tclass: target security class | |
1da177e4 | 1098 | * @avd: access vector decisions |
fa1aa143 | 1099 | * @xperms: extended permissions |
1da177e4 LT |
1100 | * |
1101 | * Compute a set of access vector decisions based on the | |
1102 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
1da177e4 | 1103 | */ |
19439d05 SS |
1104 | void security_compute_av(u32 ssid, |
1105 | u32 tsid, | |
1106 | u16 orig_tclass, | |
fa1aa143 JVS |
1107 | struct av_decision *avd, |
1108 | struct extended_perms *xperms) | |
1da177e4 | 1109 | { |
c6d3aaa4 | 1110 | u16 tclass; |
19439d05 | 1111 | struct context *scontext = NULL, *tcontext = NULL; |
c6d3aaa4 | 1112 | |
b7f3008a | 1113 | read_lock(&policy_rwlock); |
19439d05 | 1114 | avd_init(avd); |
fa1aa143 | 1115 | xperms->len = 0; |
c6d3aaa4 SS |
1116 | if (!ss_initialized) |
1117 | goto allow; | |
1118 | ||
19439d05 SS |
1119 | scontext = sidtab_search(&sidtab, ssid); |
1120 | if (!scontext) { | |
1121 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1122 | __func__, ssid); | |
1123 | goto out; | |
1124 | } | |
1125 | ||
1126 | /* permissive domain? */ | |
1127 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
1128 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
1129 | ||
1130 | tcontext = sidtab_search(&sidtab, tsid); | |
1131 | if (!tcontext) { | |
1132 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1133 | __func__, tsid); | |
1134 | goto out; | |
1135 | } | |
1136 | ||
c6d3aaa4 SS |
1137 | tclass = unmap_class(orig_tclass); |
1138 | if (unlikely(orig_tclass && !tclass)) { | |
1139 | if (policydb.allow_unknown) | |
1140 | goto allow; | |
b7f3008a | 1141 | goto out; |
c6d3aaa4 | 1142 | } |
fa1aa143 | 1143 | context_struct_compute_av(scontext, tcontext, tclass, avd, xperms); |
c6d3aaa4 | 1144 | map_decision(orig_tclass, avd, policydb.allow_unknown); |
b7f3008a | 1145 | out: |
c6d3aaa4 | 1146 | read_unlock(&policy_rwlock); |
19439d05 | 1147 | return; |
c6d3aaa4 SS |
1148 | allow: |
1149 | avd->allowed = 0xffffffff; | |
b7f3008a | 1150 | goto out; |
c6d3aaa4 SS |
1151 | } |
1152 | ||
19439d05 SS |
1153 | void security_compute_av_user(u32 ssid, |
1154 | u32 tsid, | |
1155 | u16 tclass, | |
1156 | struct av_decision *avd) | |
c6d3aaa4 | 1157 | { |
19439d05 | 1158 | struct context *scontext = NULL, *tcontext = NULL; |
1da177e4 | 1159 | |
19439d05 SS |
1160 | read_lock(&policy_rwlock); |
1161 | avd_init(avd); | |
1162 | if (!ss_initialized) | |
1163 | goto allow; | |
1164 | ||
1165 | scontext = sidtab_search(&sidtab, ssid); | |
1166 | if (!scontext) { | |
1167 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1168 | __func__, ssid); | |
1169 | goto out; | |
1da177e4 LT |
1170 | } |
1171 | ||
19439d05 SS |
1172 | /* permissive domain? */ |
1173 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
1174 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
1175 | ||
1176 | tcontext = sidtab_search(&sidtab, tsid); | |
1177 | if (!tcontext) { | |
1178 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1179 | __func__, tsid); | |
1180 | goto out; | |
1181 | } | |
1182 | ||
1183 | if (unlikely(!tclass)) { | |
1184 | if (policydb.allow_unknown) | |
1185 | goto allow; | |
1186 | goto out; | |
1187 | } | |
1188 | ||
fa1aa143 | 1189 | context_struct_compute_av(scontext, tcontext, tclass, avd, NULL); |
19439d05 | 1190 | out: |
0804d113 | 1191 | read_unlock(&policy_rwlock); |
19439d05 SS |
1192 | return; |
1193 | allow: | |
1194 | avd->allowed = 0xffffffff; | |
1195 | goto out; | |
1da177e4 LT |
1196 | } |
1197 | ||
1198 | /* | |
1199 | * Write the security context string representation of | |
1200 | * the context structure `context' into a dynamically | |
1201 | * allocated string of the correct size. Set `*scontext' | |
1202 | * to point to this string and set `*scontext_len' to | |
1203 | * the length of the string. | |
1204 | */ | |
1205 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
1206 | { | |
1207 | char *scontextp; | |
1208 | ||
d5630b9d EP |
1209 | if (scontext) |
1210 | *scontext = NULL; | |
1da177e4 LT |
1211 | *scontext_len = 0; |
1212 | ||
12b29f34 SS |
1213 | if (context->len) { |
1214 | *scontext_len = context->len; | |
bb7081ab EP |
1215 | if (scontext) { |
1216 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
1217 | if (!(*scontext)) | |
1218 | return -ENOMEM; | |
1219 | } | |
12b29f34 SS |
1220 | return 0; |
1221 | } | |
1222 | ||
1da177e4 | 1223 | /* Compute the size of the context. */ |
ac76c05b EP |
1224 | *scontext_len += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + 1; |
1225 | *scontext_len += strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + 1; | |
1226 | *scontext_len += strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)) + 1; | |
1da177e4 LT |
1227 | *scontext_len += mls_compute_context_len(context); |
1228 | ||
d5630b9d EP |
1229 | if (!scontext) |
1230 | return 0; | |
1231 | ||
1da177e4 LT |
1232 | /* Allocate space for the context; caller must free this space. */ |
1233 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 1234 | if (!scontextp) |
1da177e4 | 1235 | return -ENOMEM; |
1da177e4 LT |
1236 | *scontext = scontextp; |
1237 | ||
1238 | /* | |
1239 | * Copy the user name, role name and type name into the context. | |
1240 | */ | |
9529c788 | 1241 | scontextp += sprintf(scontextp, "%s:%s:%s", |
ac76c05b EP |
1242 | sym_name(&policydb, SYM_USERS, context->user - 1), |
1243 | sym_name(&policydb, SYM_ROLES, context->role - 1), | |
1244 | sym_name(&policydb, SYM_TYPES, context->type - 1)); | |
1da177e4 LT |
1245 | |
1246 | mls_sid_to_context(context, &scontextp); | |
1247 | ||
1248 | *scontextp = 0; | |
1249 | ||
1250 | return 0; | |
1251 | } | |
1252 | ||
1253 | #include "initial_sid_to_string.h" | |
1254 | ||
f0ee2e46 JC |
1255 | const char *security_get_initial_sid_context(u32 sid) |
1256 | { | |
1257 | if (unlikely(sid > SECINITSID_NUM)) | |
1258 | return NULL; | |
1259 | return initial_sid_to_string[sid]; | |
1260 | } | |
1261 | ||
12b29f34 SS |
1262 | static int security_sid_to_context_core(u32 sid, char **scontext, |
1263 | u32 *scontext_len, int force) | |
1da177e4 LT |
1264 | { |
1265 | struct context *context; | |
1266 | int rc = 0; | |
1267 | ||
d5630b9d EP |
1268 | if (scontext) |
1269 | *scontext = NULL; | |
4f4acf3a SS |
1270 | *scontext_len = 0; |
1271 | ||
1da177e4 LT |
1272 | if (!ss_initialized) { |
1273 | if (sid <= SECINITSID_NUM) { | |
1274 | char *scontextp; | |
1275 | ||
1276 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
d5630b9d EP |
1277 | if (!scontext) |
1278 | goto out; | |
aa736c36 RV |
1279 | scontextp = kmemdup(initial_sid_to_string[sid], |
1280 | *scontext_len, GFP_ATOMIC); | |
0cccca06 SH |
1281 | if (!scontextp) { |
1282 | rc = -ENOMEM; | |
1283 | goto out; | |
1284 | } | |
1da177e4 LT |
1285 | *scontext = scontextp; |
1286 | goto out; | |
1287 | } | |
744ba35e EP |
1288 | printk(KERN_ERR "SELinux: %s: called before initial " |
1289 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
1290 | rc = -EINVAL; |
1291 | goto out; | |
1292 | } | |
0804d113 | 1293 | read_lock(&policy_rwlock); |
12b29f34 SS |
1294 | if (force) |
1295 | context = sidtab_search_force(&sidtab, sid); | |
1296 | else | |
1297 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 1298 | if (!context) { |
744ba35e EP |
1299 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1300 | __func__, sid); | |
1da177e4 LT |
1301 | rc = -EINVAL; |
1302 | goto out_unlock; | |
1303 | } | |
1304 | rc = context_struct_to_string(context, scontext, scontext_len); | |
1305 | out_unlock: | |
0804d113 | 1306 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1307 | out: |
1308 | return rc; | |
1309 | ||
1310 | } | |
1311 | ||
12b29f34 SS |
1312 | /** |
1313 | * security_sid_to_context - Obtain a context for a given SID. | |
1314 | * @sid: security identifier, SID | |
1315 | * @scontext: security context | |
1316 | * @scontext_len: length in bytes | |
1317 | * | |
1318 | * Write the string representation of the context associated with @sid | |
1319 | * into a dynamically allocated string of the correct size. Set @scontext | |
1320 | * to point to this string and set @scontext_len to the length of the string. | |
1321 | */ | |
1322 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 1323 | { |
12b29f34 SS |
1324 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
1325 | } | |
1326 | ||
1327 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
1328 | { | |
1329 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
1330 | } | |
1331 | ||
9a59daa0 SS |
1332 | /* |
1333 | * Caveat: Mutates scontext. | |
1334 | */ | |
12b29f34 SS |
1335 | static int string_to_context_struct(struct policydb *pol, |
1336 | struct sidtab *sidtabp, | |
9a59daa0 | 1337 | char *scontext, |
12b29f34 SS |
1338 | u32 scontext_len, |
1339 | struct context *ctx, | |
9a59daa0 | 1340 | u32 def_sid) |
12b29f34 | 1341 | { |
1da177e4 LT |
1342 | struct role_datum *role; |
1343 | struct type_datum *typdatum; | |
1344 | struct user_datum *usrdatum; | |
1345 | char *scontextp, *p, oldc; | |
1346 | int rc = 0; | |
1347 | ||
12b29f34 | 1348 | context_init(ctx); |
1da177e4 | 1349 | |
1da177e4 LT |
1350 | /* Parse the security context. */ |
1351 | ||
1352 | rc = -EINVAL; | |
9a59daa0 | 1353 | scontextp = (char *) scontext; |
1da177e4 LT |
1354 | |
1355 | /* Extract the user. */ | |
1356 | p = scontextp; | |
1357 | while (*p && *p != ':') | |
1358 | p++; | |
1359 | ||
1360 | if (*p == 0) | |
12b29f34 | 1361 | goto out; |
1da177e4 LT |
1362 | |
1363 | *p++ = 0; | |
1364 | ||
12b29f34 | 1365 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1366 | if (!usrdatum) |
12b29f34 | 1367 | goto out; |
1da177e4 | 1368 | |
12b29f34 | 1369 | ctx->user = usrdatum->value; |
1da177e4 LT |
1370 | |
1371 | /* Extract role. */ | |
1372 | scontextp = p; | |
1373 | while (*p && *p != ':') | |
1374 | p++; | |
1375 | ||
1376 | if (*p == 0) | |
12b29f34 | 1377 | goto out; |
1da177e4 LT |
1378 | |
1379 | *p++ = 0; | |
1380 | ||
12b29f34 | 1381 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1382 | if (!role) |
12b29f34 SS |
1383 | goto out; |
1384 | ctx->role = role->value; | |
1da177e4 LT |
1385 | |
1386 | /* Extract type. */ | |
1387 | scontextp = p; | |
1388 | while (*p && *p != ':') | |
1389 | p++; | |
1390 | oldc = *p; | |
1391 | *p++ = 0; | |
1392 | ||
12b29f34 | 1393 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1394 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1395 | goto out; |
1da177e4 | 1396 | |
12b29f34 | 1397 | ctx->type = typdatum->value; |
1da177e4 | 1398 | |
12b29f34 | 1399 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 1400 | if (rc) |
12b29f34 | 1401 | goto out; |
1da177e4 | 1402 | |
4b02b524 EP |
1403 | rc = -EINVAL; |
1404 | if ((p - scontext) < scontext_len) | |
12b29f34 | 1405 | goto out; |
1da177e4 LT |
1406 | |
1407 | /* Check the validity of the new context. */ | |
4b02b524 | 1408 | if (!policydb_context_isvalid(pol, ctx)) |
12b29f34 | 1409 | goto out; |
12b29f34 SS |
1410 | rc = 0; |
1411 | out: | |
8e531af9 EP |
1412 | if (rc) |
1413 | context_destroy(ctx); | |
12b29f34 SS |
1414 | return rc; |
1415 | } | |
1416 | ||
1417 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
1418 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
1419 | int force) | |
1420 | { | |
9a59daa0 | 1421 | char *scontext2, *str = NULL; |
12b29f34 SS |
1422 | struct context context; |
1423 | int rc = 0; | |
1424 | ||
2172fa70 SS |
1425 | /* An empty security context is never valid. */ |
1426 | if (!scontext_len) | |
1427 | return -EINVAL; | |
1428 | ||
12b29f34 SS |
1429 | if (!ss_initialized) { |
1430 | int i; | |
1431 | ||
1432 | for (i = 1; i < SECINITSID_NUM; i++) { | |
1433 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
1434 | *sid = i; | |
9a59daa0 | 1435 | return 0; |
12b29f34 SS |
1436 | } |
1437 | } | |
1438 | *sid = SECINITSID_KERNEL; | |
9a59daa0 | 1439 | return 0; |
12b29f34 SS |
1440 | } |
1441 | *sid = SECSID_NULL; | |
1442 | ||
9a59daa0 | 1443 | /* Copy the string so that we can modify the copy as we parse it. */ |
c1a7368a | 1444 | scontext2 = kmalloc(scontext_len + 1, gfp_flags); |
9a59daa0 SS |
1445 | if (!scontext2) |
1446 | return -ENOMEM; | |
1447 | memcpy(scontext2, scontext, scontext_len); | |
1448 | scontext2[scontext_len] = 0; | |
1449 | ||
1450 | if (force) { | |
1451 | /* Save another copy for storing in uninterpreted form */ | |
4b02b524 | 1452 | rc = -ENOMEM; |
9a59daa0 | 1453 | str = kstrdup(scontext2, gfp_flags); |
4b02b524 EP |
1454 | if (!str) |
1455 | goto out; | |
9a59daa0 SS |
1456 | } |
1457 | ||
0804d113 | 1458 | read_lock(&policy_rwlock); |
4b02b524 EP |
1459 | rc = string_to_context_struct(&policydb, &sidtab, scontext2, |
1460 | scontext_len, &context, def_sid); | |
12b29f34 | 1461 | if (rc == -EINVAL && force) { |
9a59daa0 | 1462 | context.str = str; |
12b29f34 | 1463 | context.len = scontext_len; |
9a59daa0 | 1464 | str = NULL; |
12b29f34 | 1465 | } else if (rc) |
4b02b524 | 1466 | goto out_unlock; |
12b29f34 | 1467 | rc = sidtab_context_to_sid(&sidtab, &context, sid); |
8e531af9 | 1468 | context_destroy(&context); |
4b02b524 | 1469 | out_unlock: |
0804d113 | 1470 | read_unlock(&policy_rwlock); |
4b02b524 | 1471 | out: |
9a59daa0 SS |
1472 | kfree(scontext2); |
1473 | kfree(str); | |
1da177e4 LT |
1474 | return rc; |
1475 | } | |
1476 | ||
f5c1d5b2 JM |
1477 | /** |
1478 | * security_context_to_sid - Obtain a SID for a given security context. | |
1479 | * @scontext: security context | |
1480 | * @scontext_len: length in bytes | |
1481 | * @sid: security identifier, SID | |
52a4c640 | 1482 | * @gfp: context for the allocation |
f5c1d5b2 JM |
1483 | * |
1484 | * Obtains a SID associated with the security context that | |
1485 | * has the string representation specified by @scontext. | |
1486 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1487 | * memory is available, or 0 on success. | |
1488 | */ | |
52a4c640 NA |
1489 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid, |
1490 | gfp_t gfp) | |
f5c1d5b2 JM |
1491 | { |
1492 | return security_context_to_sid_core(scontext, scontext_len, | |
52a4c640 | 1493 | sid, SECSID_NULL, gfp, 0); |
44be2f65 RV |
1494 | } |
1495 | ||
1496 | int security_context_str_to_sid(const char *scontext, u32 *sid, gfp_t gfp) | |
1497 | { | |
1498 | return security_context_to_sid(scontext, strlen(scontext), sid, gfp); | |
f5c1d5b2 JM |
1499 | } |
1500 | ||
1501 | /** | |
1502 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1503 | * falling back to specified default if needed. | |
1504 | * | |
1505 | * @scontext: security context | |
1506 | * @scontext_len: length in bytes | |
1507 | * @sid: security identifier, SID | |
d133a960 | 1508 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1509 | * |
1510 | * Obtains a SID associated with the security context that | |
1511 | * has the string representation specified by @scontext. | |
1512 | * The default SID is passed to the MLS layer to be used to allow | |
1513 | * kernel labeling of the MLS field if the MLS field is not present | |
1514 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1515 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1516 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1517 | * memory is available, or 0 on success. | |
1518 | */ | |
7bf570dc DH |
1519 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1520 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1521 | { |
1522 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1523 | sid, def_sid, gfp_flags, 1); |
1524 | } | |
1525 | ||
1526 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1527 | u32 *sid) | |
1528 | { | |
1529 | return security_context_to_sid_core(scontext, scontext_len, | |
1530 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1531 | } |
1532 | ||
1da177e4 LT |
1533 | static int compute_sid_handle_invalid_context( |
1534 | struct context *scontext, | |
1535 | struct context *tcontext, | |
1536 | u16 tclass, | |
1537 | struct context *newcontext) | |
1538 | { | |
1539 | char *s = NULL, *t = NULL, *n = NULL; | |
1540 | u32 slen, tlen, nlen; | |
1541 | ||
4b02b524 | 1542 | if (context_struct_to_string(scontext, &s, &slen)) |
1da177e4 | 1543 | goto out; |
4b02b524 | 1544 | if (context_struct_to_string(tcontext, &t, &tlen)) |
1da177e4 | 1545 | goto out; |
4b02b524 | 1546 | if (context_struct_to_string(newcontext, &n, &nlen)) |
1da177e4 | 1547 | goto out; |
9ad9ad38 | 1548 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
4093a844 RGB |
1549 | "op=security_compute_sid invalid_context=%s" |
1550 | " scontext=%s" | |
1da177e4 LT |
1551 | " tcontext=%s" |
1552 | " tclass=%s", | |
ac76c05b | 1553 | n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); |
1da177e4 LT |
1554 | out: |
1555 | kfree(s); | |
1556 | kfree(t); | |
1557 | kfree(n); | |
1558 | if (!selinux_enforcing) | |
1559 | return 0; | |
1560 | return -EACCES; | |
1561 | } | |
1562 | ||
652bb9b0 | 1563 | static void filename_compute_type(struct policydb *p, struct context *newcontext, |
2667991f | 1564 | u32 stype, u32 ttype, u16 tclass, |
f50a3ec9 | 1565 | const char *objname) |
652bb9b0 | 1566 | { |
2463c26d EP |
1567 | struct filename_trans ft; |
1568 | struct filename_trans_datum *otype; | |
03a4c018 EP |
1569 | |
1570 | /* | |
1571 | * Most filename trans rules are going to live in specific directories | |
1572 | * like /dev or /var/run. This bitmap will quickly skip rule searches | |
1573 | * if the ttype does not contain any rules. | |
1574 | */ | |
1575 | if (!ebitmap_get_bit(&p->filename_trans_ttypes, ttype)) | |
1576 | return; | |
1577 | ||
2463c26d EP |
1578 | ft.stype = stype; |
1579 | ft.ttype = ttype; | |
1580 | ft.tclass = tclass; | |
1581 | ft.name = objname; | |
1582 | ||
1583 | otype = hashtab_search(p->filename_trans, &ft); | |
1584 | if (otype) | |
1585 | newcontext->type = otype->otype; | |
652bb9b0 EP |
1586 | } |
1587 | ||
1da177e4 LT |
1588 | static int security_compute_sid(u32 ssid, |
1589 | u32 tsid, | |
c6d3aaa4 | 1590 | u16 orig_tclass, |
1da177e4 | 1591 | u32 specified, |
f50a3ec9 | 1592 | const char *objname, |
c6d3aaa4 SS |
1593 | u32 *out_sid, |
1594 | bool kern) | |
1da177e4 | 1595 | { |
aa893269 | 1596 | struct class_datum *cladatum = NULL; |
1da177e4 LT |
1597 | struct context *scontext = NULL, *tcontext = NULL, newcontext; |
1598 | struct role_trans *roletr = NULL; | |
1599 | struct avtab_key avkey; | |
1600 | struct avtab_datum *avdatum; | |
1601 | struct avtab_node *node; | |
c6d3aaa4 | 1602 | u16 tclass; |
1da177e4 | 1603 | int rc = 0; |
6f5317e7 | 1604 | bool sock; |
1da177e4 LT |
1605 | |
1606 | if (!ss_initialized) { | |
c6d3aaa4 SS |
1607 | switch (orig_tclass) { |
1608 | case SECCLASS_PROCESS: /* kernel value */ | |
1da177e4 LT |
1609 | *out_sid = ssid; |
1610 | break; | |
1611 | default: | |
1612 | *out_sid = tsid; | |
1613 | break; | |
1614 | } | |
1615 | goto out; | |
1616 | } | |
1617 | ||
851f8a69 VY |
1618 | context_init(&newcontext); |
1619 | ||
0804d113 | 1620 | read_lock(&policy_rwlock); |
1da177e4 | 1621 | |
6f5317e7 | 1622 | if (kern) { |
c6d3aaa4 | 1623 | tclass = unmap_class(orig_tclass); |
6f5317e7 HC |
1624 | sock = security_is_socket_class(orig_tclass); |
1625 | } else { | |
c6d3aaa4 | 1626 | tclass = orig_tclass; |
6f5317e7 HC |
1627 | sock = security_is_socket_class(map_class(tclass)); |
1628 | } | |
c6d3aaa4 | 1629 | |
1da177e4 LT |
1630 | scontext = sidtab_search(&sidtab, ssid); |
1631 | if (!scontext) { | |
744ba35e EP |
1632 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1633 | __func__, ssid); | |
1da177e4 LT |
1634 | rc = -EINVAL; |
1635 | goto out_unlock; | |
1636 | } | |
1637 | tcontext = sidtab_search(&sidtab, tsid); | |
1638 | if (!tcontext) { | |
744ba35e EP |
1639 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1640 | __func__, tsid); | |
1da177e4 LT |
1641 | rc = -EINVAL; |
1642 | goto out_unlock; | |
1643 | } | |
1644 | ||
aa893269 EP |
1645 | if (tclass && tclass <= policydb.p_classes.nprim) |
1646 | cladatum = policydb.class_val_to_struct[tclass - 1]; | |
1647 | ||
1da177e4 LT |
1648 | /* Set the user identity. */ |
1649 | switch (specified) { | |
1650 | case AVTAB_TRANSITION: | |
1651 | case AVTAB_CHANGE: | |
aa893269 EP |
1652 | if (cladatum && cladatum->default_user == DEFAULT_TARGET) { |
1653 | newcontext.user = tcontext->user; | |
1654 | } else { | |
1655 | /* notice this gets both DEFAULT_SOURCE and unset */ | |
1656 | /* Use the process user identity. */ | |
1657 | newcontext.user = scontext->user; | |
1658 | } | |
1da177e4 LT |
1659 | break; |
1660 | case AVTAB_MEMBER: | |
1661 | /* Use the related object owner. */ | |
1662 | newcontext.user = tcontext->user; | |
1663 | break; | |
1664 | } | |
1665 | ||
aa893269 EP |
1666 | /* Set the role to default values. */ |
1667 | if (cladatum && cladatum->default_role == DEFAULT_SOURCE) { | |
1da177e4 | 1668 | newcontext.role = scontext->role; |
aa893269 EP |
1669 | } else if (cladatum && cladatum->default_role == DEFAULT_TARGET) { |
1670 | newcontext.role = tcontext->role; | |
1671 | } else { | |
1672 | if ((tclass == policydb.process_class) || (sock == true)) | |
1673 | newcontext.role = scontext->role; | |
1674 | else | |
1675 | newcontext.role = OBJECT_R_VAL; | |
1676 | } | |
1677 | ||
1678 | /* Set the type to default values. */ | |
eed7795d | 1679 | if (cladatum && cladatum->default_type == DEFAULT_SOURCE) { |
1da177e4 | 1680 | newcontext.type = scontext->type; |
eed7795d | 1681 | } else if (cladatum && cladatum->default_type == DEFAULT_TARGET) { |
1da177e4 | 1682 | newcontext.type = tcontext->type; |
eed7795d EP |
1683 | } else { |
1684 | if ((tclass == policydb.process_class) || (sock == true)) { | |
1685 | /* Use the type of process. */ | |
1686 | newcontext.type = scontext->type; | |
1687 | } else { | |
1688 | /* Use the type of the related object. */ | |
1689 | newcontext.type = tcontext->type; | |
1690 | } | |
1da177e4 LT |
1691 | } |
1692 | ||
1693 | /* Look for a type transition/member/change rule. */ | |
1694 | avkey.source_type = scontext->type; | |
1695 | avkey.target_type = tcontext->type; | |
1696 | avkey.target_class = tclass; | |
782ebb99 SS |
1697 | avkey.specified = specified; |
1698 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1699 | |
1700 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1701 | if (!avdatum) { |
782ebb99 | 1702 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1703 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1704 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1705 | avdatum = &node->datum; |
1706 | break; | |
1707 | } | |
1708 | } | |
1709 | } | |
1710 | ||
782ebb99 | 1711 | if (avdatum) { |
1da177e4 | 1712 | /* Use the type from the type transition/member/change rule. */ |
fa1aa143 | 1713 | newcontext.type = avdatum->u.data; |
1da177e4 LT |
1714 | } |
1715 | ||
4742600c | 1716 | /* if we have a objname this is a file trans check so check those rules */ |
f50a3ec9 | 1717 | if (objname) |
652bb9b0 | 1718 | filename_compute_type(&policydb, &newcontext, scontext->type, |
f50a3ec9 | 1719 | tcontext->type, tclass, objname); |
652bb9b0 | 1720 | |
1da177e4 | 1721 | /* Check for class-specific changes. */ |
63a312ca HC |
1722 | if (specified & AVTAB_TRANSITION) { |
1723 | /* Look for a role transition rule. */ | |
1724 | for (roletr = policydb.role_tr; roletr; roletr = roletr->next) { | |
1725 | if ((roletr->role == scontext->role) && | |
1726 | (roletr->type == tcontext->type) && | |
1727 | (roletr->tclass == tclass)) { | |
1728 | /* Use the role transition rule. */ | |
1729 | newcontext.role = roletr->new_role; | |
1730 | break; | |
1da177e4 LT |
1731 | } |
1732 | } | |
1da177e4 LT |
1733 | } |
1734 | ||
1735 | /* Set the MLS attributes. | |
1736 | This is done last because it may allocate memory. */ | |
6f5317e7 HC |
1737 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, |
1738 | &newcontext, sock); | |
1da177e4 LT |
1739 | if (rc) |
1740 | goto out_unlock; | |
1741 | ||
1742 | /* Check the validity of the context. */ | |
1743 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1744 | rc = compute_sid_handle_invalid_context(scontext, | |
1745 | tcontext, | |
1746 | tclass, | |
1747 | &newcontext); | |
1748 | if (rc) | |
1749 | goto out_unlock; | |
1750 | } | |
1751 | /* Obtain the sid for the context. */ | |
1752 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1753 | out_unlock: | |
0804d113 | 1754 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1755 | context_destroy(&newcontext); |
1756 | out: | |
1757 | return rc; | |
1758 | } | |
1759 | ||
1760 | /** | |
1761 | * security_transition_sid - Compute the SID for a new subject/object. | |
1762 | * @ssid: source security identifier | |
1763 | * @tsid: target security identifier | |
1764 | * @tclass: target security class | |
1765 | * @out_sid: security identifier for new subject/object | |
1766 | * | |
1767 | * Compute a SID to use for labeling a new subject or object in the | |
1768 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1769 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1770 | * if insufficient memory is available, or %0 if the new SID was | |
1771 | * computed successfully. | |
1772 | */ | |
652bb9b0 EP |
1773 | int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, |
1774 | const struct qstr *qstr, u32 *out_sid) | |
1da177e4 | 1775 | { |
c6d3aaa4 | 1776 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, |
f50a3ec9 | 1777 | qstr ? qstr->name : NULL, out_sid, true); |
c6d3aaa4 SS |
1778 | } |
1779 | ||
f50a3ec9 KK |
1780 | int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, |
1781 | const char *objname, u32 *out_sid) | |
c6d3aaa4 SS |
1782 | { |
1783 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, | |
f50a3ec9 | 1784 | objname, out_sid, false); |
1da177e4 LT |
1785 | } |
1786 | ||
1787 | /** | |
1788 | * security_member_sid - Compute the SID for member selection. | |
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 when selecting a member of a polyinstantiated | |
1795 | * object of class @tclass 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_member_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_MEMBER, NULL, |
1806 | out_sid, false); | |
1da177e4 LT |
1807 | } |
1808 | ||
1809 | /** | |
1810 | * security_change_sid - Compute the SID for object relabeling. | |
1811 | * @ssid: source security identifier | |
1812 | * @tsid: target security identifier | |
1813 | * @tclass: target security class | |
1814 | * @out_sid: security identifier for selected member | |
1815 | * | |
1816 | * Compute a SID to use for relabeling an object of class @tclass | |
1817 | * based on a SID pair (@ssid, @tsid). | |
1818 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1819 | * if insufficient memory is available, or %0 if the SID was | |
1820 | * computed successfully. | |
1821 | */ | |
1822 | int security_change_sid(u32 ssid, | |
1823 | u32 tsid, | |
1824 | u16 tclass, | |
1825 | u32 *out_sid) | |
1826 | { | |
652bb9b0 EP |
1827 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL, |
1828 | out_sid, false); | |
b94c7e67 CS |
1829 | } |
1830 | ||
1da177e4 LT |
1831 | /* Clone the SID into the new SID table. */ |
1832 | static int clone_sid(u32 sid, | |
1833 | struct context *context, | |
1834 | void *arg) | |
1835 | { | |
1836 | struct sidtab *s = arg; | |
1837 | ||
42596eaf GT |
1838 | if (sid > SECINITSID_NUM) |
1839 | return sidtab_insert(s, sid, context); | |
1840 | else | |
1841 | return 0; | |
1da177e4 LT |
1842 | } |
1843 | ||
1844 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1845 | { | |
4b02b524 EP |
1846 | char *s; |
1847 | u32 len; | |
1da177e4 | 1848 | |
4b02b524 EP |
1849 | if (selinux_enforcing) |
1850 | return -EINVAL; | |
1851 | ||
1852 | if (!context_struct_to_string(context, &s, &len)) { | |
1853 | printk(KERN_WARNING "SELinux: Context %s would be invalid if enforcing\n", s); | |
1854 | kfree(s); | |
1da177e4 | 1855 | } |
4b02b524 | 1856 | return 0; |
1da177e4 LT |
1857 | } |
1858 | ||
1859 | struct convert_context_args { | |
1860 | struct policydb *oldp; | |
1861 | struct policydb *newp; | |
1862 | }; | |
1863 | ||
1864 | /* | |
1865 | * Convert the values in the security context | |
1866 | * structure `c' from the values specified | |
1867 | * in the policy `p->oldp' to the values specified | |
1868 | * in the policy `p->newp'. Verify that the | |
1869 | * context is valid under the new policy. | |
1870 | */ | |
1871 | static int convert_context(u32 key, | |
1872 | struct context *c, | |
1873 | void *p) | |
1874 | { | |
1875 | struct convert_context_args *args; | |
1876 | struct context oldc; | |
0719aaf5 GT |
1877 | struct ocontext *oc; |
1878 | struct mls_range *range; | |
1da177e4 LT |
1879 | struct role_datum *role; |
1880 | struct type_datum *typdatum; | |
1881 | struct user_datum *usrdatum; | |
1882 | char *s; | |
1883 | u32 len; | |
42596eaf GT |
1884 | int rc = 0; |
1885 | ||
1886 | if (key <= SECINITSID_NUM) | |
1887 | goto out; | |
1da177e4 LT |
1888 | |
1889 | args = p; | |
1890 | ||
12b29f34 SS |
1891 | if (c->str) { |
1892 | struct context ctx; | |
4b02b524 EP |
1893 | |
1894 | rc = -ENOMEM; | |
9a59daa0 | 1895 | s = kstrdup(c->str, GFP_KERNEL); |
4b02b524 | 1896 | if (!s) |
9a59daa0 | 1897 | goto out; |
4b02b524 | 1898 | |
9a59daa0 SS |
1899 | rc = string_to_context_struct(args->newp, NULL, s, |
1900 | c->len, &ctx, SECSID_NULL); | |
1901 | kfree(s); | |
12b29f34 | 1902 | if (!rc) { |
4b02b524 | 1903 | printk(KERN_INFO "SELinux: Context %s became valid (mapped).\n", |
12b29f34 SS |
1904 | c->str); |
1905 | /* Replace string with mapped representation. */ | |
1906 | kfree(c->str); | |
1907 | memcpy(c, &ctx, sizeof(*c)); | |
1908 | goto out; | |
1909 | } else if (rc == -EINVAL) { | |
1910 | /* Retain string representation for later mapping. */ | |
1911 | rc = 0; | |
1912 | goto out; | |
1913 | } else { | |
1914 | /* Other error condition, e.g. ENOMEM. */ | |
4b02b524 | 1915 | printk(KERN_ERR "SELinux: Unable to map context %s, rc = %d.\n", |
12b29f34 SS |
1916 | c->str, -rc); |
1917 | goto out; | |
1918 | } | |
1919 | } | |
1920 | ||
1da177e4 LT |
1921 | rc = context_cpy(&oldc, c); |
1922 | if (rc) | |
1923 | goto out; | |
1924 | ||
1da177e4 | 1925 | /* Convert the user. */ |
4b02b524 | 1926 | rc = -EINVAL; |
1da177e4 | 1927 | usrdatum = hashtab_search(args->newp->p_users.table, |
ac76c05b | 1928 | sym_name(args->oldp, SYM_USERS, c->user - 1)); |
5d55a345 | 1929 | if (!usrdatum) |
1da177e4 | 1930 | goto bad; |
1da177e4 LT |
1931 | c->user = usrdatum->value; |
1932 | ||
1933 | /* Convert the role. */ | |
4b02b524 | 1934 | rc = -EINVAL; |
1da177e4 | 1935 | role = hashtab_search(args->newp->p_roles.table, |
ac76c05b | 1936 | sym_name(args->oldp, SYM_ROLES, c->role - 1)); |
5d55a345 | 1937 | if (!role) |
1da177e4 | 1938 | goto bad; |
1da177e4 LT |
1939 | c->role = role->value; |
1940 | ||
1941 | /* Convert the type. */ | |
4b02b524 | 1942 | rc = -EINVAL; |
1da177e4 | 1943 | typdatum = hashtab_search(args->newp->p_types.table, |
ac76c05b | 1944 | sym_name(args->oldp, SYM_TYPES, c->type - 1)); |
5d55a345 | 1945 | if (!typdatum) |
1da177e4 | 1946 | goto bad; |
1da177e4 LT |
1947 | c->type = typdatum->value; |
1948 | ||
0719aaf5 GT |
1949 | /* Convert the MLS fields if dealing with MLS policies */ |
1950 | if (args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1951 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1952 | if (rc) | |
1953 | goto bad; | |
1954 | } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) { | |
1955 | /* | |
1956 | * Switching between MLS and non-MLS policy: | |
1957 | * free any storage used by the MLS fields in the | |
1958 | * context for all existing entries in the sidtab. | |
1959 | */ | |
1960 | mls_context_destroy(c); | |
1961 | } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1962 | /* | |
1963 | * Switching between non-MLS and MLS policy: | |
1964 | * ensure that the MLS fields of the context for all | |
1965 | * existing entries in the sidtab are filled in with a | |
1966 | * suitable default value, likely taken from one of the | |
1967 | * initial SIDs. | |
1968 | */ | |
1969 | oc = args->newp->ocontexts[OCON_ISID]; | |
1970 | while (oc && oc->sid[0] != SECINITSID_UNLABELED) | |
1971 | oc = oc->next; | |
4b02b524 | 1972 | rc = -EINVAL; |
0719aaf5 GT |
1973 | if (!oc) { |
1974 | printk(KERN_ERR "SELinux: unable to look up" | |
1975 | " the initial SIDs list\n"); | |
1976 | goto bad; | |
1977 | } | |
1978 | range = &oc->context[0].range; | |
1979 | rc = mls_range_set(c, range); | |
1980 | if (rc) | |
1981 | goto bad; | |
1982 | } | |
1da177e4 LT |
1983 | |
1984 | /* Check the validity of the new context. */ | |
1985 | if (!policydb_context_isvalid(args->newp, c)) { | |
1986 | rc = convert_context_handle_invalid_context(&oldc); | |
1987 | if (rc) | |
1988 | goto bad; | |
1989 | } | |
1990 | ||
1991 | context_destroy(&oldc); | |
4b02b524 | 1992 | |
12b29f34 | 1993 | rc = 0; |
1da177e4 LT |
1994 | out: |
1995 | return rc; | |
1996 | bad: | |
12b29f34 | 1997 | /* Map old representation to string and save it. */ |
4b02b524 EP |
1998 | rc = context_struct_to_string(&oldc, &s, &len); |
1999 | if (rc) | |
2000 | return rc; | |
1da177e4 | 2001 | context_destroy(&oldc); |
12b29f34 SS |
2002 | context_destroy(c); |
2003 | c->str = s; | |
2004 | c->len = len; | |
4b02b524 | 2005 | printk(KERN_INFO "SELinux: Context %s became invalid (unmapped).\n", |
12b29f34 SS |
2006 | c->str); |
2007 | rc = 0; | |
1da177e4 LT |
2008 | goto out; |
2009 | } | |
2010 | ||
3bb56b25 PM |
2011 | static void security_load_policycaps(void) |
2012 | { | |
2013 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
2014 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
2015 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
2016 | POLICYDB_CAPABILITY_OPENPERM); | |
2be4d74f CP |
2017 | selinux_policycap_alwaysnetwork = ebitmap_get_bit(&policydb.policycaps, |
2018 | POLICYDB_CAPABILITY_ALWAYSNETWORK); | |
3bb56b25 PM |
2019 | } |
2020 | ||
e900a7d9 | 2021 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
2022 | |
2023 | /** | |
2024 | * security_load_policy - Load a security policy configuration. | |
2025 | * @data: binary policy data | |
2026 | * @len: length of data in bytes | |
2027 | * | |
2028 | * Load a new set of security policy configuration data, | |
2029 | * validate it and convert the SID table as necessary. | |
2030 | * This function will flush the access vector cache after | |
2031 | * loading the new policy. | |
2032 | */ | |
2033 | int security_load_policy(void *data, size_t len) | |
2034 | { | |
b5495b42 | 2035 | struct policydb *oldpolicydb, *newpolicydb; |
1da177e4 | 2036 | struct sidtab oldsidtab, newsidtab; |
c6d3aaa4 | 2037 | struct selinux_mapping *oldmap, *map = NULL; |
1da177e4 LT |
2038 | struct convert_context_args args; |
2039 | u32 seqno; | |
c6d3aaa4 | 2040 | u16 map_size; |
1da177e4 LT |
2041 | int rc = 0; |
2042 | struct policy_file file = { data, len }, *fp = &file; | |
2043 | ||
b5495b42 TG |
2044 | oldpolicydb = kzalloc(2 * sizeof(*oldpolicydb), GFP_KERNEL); |
2045 | if (!oldpolicydb) { | |
2046 | rc = -ENOMEM; | |
2047 | goto out; | |
2048 | } | |
2049 | newpolicydb = oldpolicydb + 1; | |
2050 | ||
1da177e4 LT |
2051 | if (!ss_initialized) { |
2052 | avtab_cache_init(); | |
a2000050 EP |
2053 | rc = policydb_read(&policydb, fp); |
2054 | if (rc) { | |
1da177e4 | 2055 | avtab_cache_destroy(); |
b5495b42 | 2056 | goto out; |
1da177e4 | 2057 | } |
a2000050 | 2058 | |
cee74f47 | 2059 | policydb.len = len; |
a2000050 EP |
2060 | rc = selinux_set_mapping(&policydb, secclass_map, |
2061 | ¤t_mapping, | |
2062 | ¤t_mapping_size); | |
2063 | if (rc) { | |
1da177e4 LT |
2064 | policydb_destroy(&policydb); |
2065 | avtab_cache_destroy(); | |
b5495b42 | 2066 | goto out; |
1da177e4 | 2067 | } |
a2000050 EP |
2068 | |
2069 | rc = policydb_load_isids(&policydb, &sidtab); | |
2070 | if (rc) { | |
b94c7e67 CS |
2071 | policydb_destroy(&policydb); |
2072 | avtab_cache_destroy(); | |
b5495b42 | 2073 | goto out; |
b94c7e67 | 2074 | } |
a2000050 | 2075 | |
3bb56b25 | 2076 | security_load_policycaps(); |
1da177e4 | 2077 | ss_initialized = 1; |
4c443d1b | 2078 | seqno = ++latest_granting; |
1da177e4 | 2079 | selinux_complete_init(); |
4c443d1b SS |
2080 | avc_ss_reset(seqno); |
2081 | selnl_notify_policyload(seqno); | |
11904167 | 2082 | selinux_status_update_policyload(seqno); |
7420ed23 | 2083 | selinux_netlbl_cache_invalidate(); |
342a0cff | 2084 | selinux_xfrm_notify_policyload(); |
b5495b42 | 2085 | goto out; |
1da177e4 LT |
2086 | } |
2087 | ||
2088 | #if 0 | |
2089 | sidtab_hash_eval(&sidtab, "sids"); | |
2090 | #endif | |
2091 | ||
b5495b42 | 2092 | rc = policydb_read(newpolicydb, fp); |
a2000050 | 2093 | if (rc) |
b5495b42 | 2094 | goto out; |
1da177e4 | 2095 | |
b5495b42 | 2096 | newpolicydb->len = len; |
0719aaf5 | 2097 | /* If switching between different policy types, log MLS status */ |
b5495b42 | 2098 | if (policydb.mls_enabled && !newpolicydb->mls_enabled) |
0719aaf5 | 2099 | printk(KERN_INFO "SELinux: Disabling MLS support...\n"); |
b5495b42 | 2100 | else if (!policydb.mls_enabled && newpolicydb->mls_enabled) |
0719aaf5 GT |
2101 | printk(KERN_INFO "SELinux: Enabling MLS support...\n"); |
2102 | ||
b5495b42 | 2103 | rc = policydb_load_isids(newpolicydb, &newsidtab); |
42596eaf GT |
2104 | if (rc) { |
2105 | printk(KERN_ERR "SELinux: unable to load the initial SIDs\n"); | |
b5495b42 TG |
2106 | policydb_destroy(newpolicydb); |
2107 | goto out; | |
12b29f34 | 2108 | } |
1da177e4 | 2109 | |
b5495b42 | 2110 | rc = selinux_set_mapping(newpolicydb, secclass_map, &map, &map_size); |
a2000050 | 2111 | if (rc) |
b94c7e67 | 2112 | goto err; |
b94c7e67 | 2113 | |
b5495b42 | 2114 | rc = security_preserve_bools(newpolicydb); |
e900a7d9 | 2115 | if (rc) { |
454d972c | 2116 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
2117 | goto err; |
2118 | } | |
2119 | ||
1da177e4 LT |
2120 | /* Clone the SID table. */ |
2121 | sidtab_shutdown(&sidtab); | |
a2000050 EP |
2122 | |
2123 | rc = sidtab_map(&sidtab, clone_sid, &newsidtab); | |
2124 | if (rc) | |
1da177e4 | 2125 | goto err; |
1da177e4 | 2126 | |
12b29f34 SS |
2127 | /* |
2128 | * Convert the internal representations of contexts | |
2129 | * in the new SID table. | |
2130 | */ | |
1da177e4 | 2131 | args.oldp = &policydb; |
b5495b42 | 2132 | args.newp = newpolicydb; |
12b29f34 | 2133 | rc = sidtab_map(&newsidtab, convert_context, &args); |
0719aaf5 GT |
2134 | if (rc) { |
2135 | printk(KERN_ERR "SELinux: unable to convert the internal" | |
2136 | " representation of contexts in the new SID" | |
2137 | " table\n"); | |
12b29f34 | 2138 | goto err; |
0719aaf5 | 2139 | } |
1da177e4 LT |
2140 | |
2141 | /* Save the old policydb and SID table to free later. */ | |
b5495b42 | 2142 | memcpy(oldpolicydb, &policydb, sizeof(policydb)); |
1da177e4 LT |
2143 | sidtab_set(&oldsidtab, &sidtab); |
2144 | ||
2145 | /* Install the new policydb and SID table. */ | |
0804d113 | 2146 | write_lock_irq(&policy_rwlock); |
b5495b42 | 2147 | memcpy(&policydb, newpolicydb, sizeof(policydb)); |
1da177e4 | 2148 | sidtab_set(&sidtab, &newsidtab); |
3bb56b25 | 2149 | security_load_policycaps(); |
c6d3aaa4 SS |
2150 | oldmap = current_mapping; |
2151 | current_mapping = map; | |
2152 | current_mapping_size = map_size; | |
1da177e4 | 2153 | seqno = ++latest_granting; |
0804d113 | 2154 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2155 | |
2156 | /* Free the old policydb and SID table. */ | |
b5495b42 | 2157 | policydb_destroy(oldpolicydb); |
1da177e4 | 2158 | sidtab_destroy(&oldsidtab); |
c6d3aaa4 | 2159 | kfree(oldmap); |
1da177e4 LT |
2160 | |
2161 | avc_ss_reset(seqno); | |
2162 | selnl_notify_policyload(seqno); | |
11904167 | 2163 | selinux_status_update_policyload(seqno); |
7420ed23 | 2164 | selinux_netlbl_cache_invalidate(); |
342a0cff | 2165 | selinux_xfrm_notify_policyload(); |
1da177e4 | 2166 | |
b5495b42 TG |
2167 | rc = 0; |
2168 | goto out; | |
1da177e4 LT |
2169 | |
2170 | err: | |
c6d3aaa4 | 2171 | kfree(map); |
1da177e4 | 2172 | sidtab_destroy(&newsidtab); |
b5495b42 | 2173 | policydb_destroy(newpolicydb); |
1da177e4 | 2174 | |
b5495b42 TG |
2175 | out: |
2176 | kfree(oldpolicydb); | |
2177 | return rc; | |
1da177e4 LT |
2178 | } |
2179 | ||
cee74f47 EP |
2180 | size_t security_policydb_len(void) |
2181 | { | |
2182 | size_t len; | |
2183 | ||
2184 | read_lock(&policy_rwlock); | |
2185 | len = policydb.len; | |
2186 | read_unlock(&policy_rwlock); | |
2187 | ||
2188 | return len; | |
2189 | } | |
2190 | ||
1da177e4 LT |
2191 | /** |
2192 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
2193 | * @protocol: protocol number |
2194 | * @port: port number | |
2195 | * @out_sid: security identifier | |
2196 | */ | |
3e112172 | 2197 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
2198 | { |
2199 | struct ocontext *c; | |
2200 | int rc = 0; | |
2201 | ||
0804d113 | 2202 | read_lock(&policy_rwlock); |
1da177e4 LT |
2203 | |
2204 | c = policydb.ocontexts[OCON_PORT]; | |
2205 | while (c) { | |
2206 | if (c->u.port.protocol == protocol && | |
2207 | c->u.port.low_port <= port && | |
2208 | c->u.port.high_port >= port) | |
2209 | break; | |
2210 | c = c->next; | |
2211 | } | |
2212 | ||
2213 | if (c) { | |
2214 | if (!c->sid[0]) { | |
2215 | rc = sidtab_context_to_sid(&sidtab, | |
2216 | &c->context[0], | |
2217 | &c->sid[0]); | |
2218 | if (rc) | |
2219 | goto out; | |
2220 | } | |
2221 | *out_sid = c->sid[0]; | |
2222 | } else { | |
2223 | *out_sid = SECINITSID_PORT; | |
2224 | } | |
2225 | ||
2226 | out: | |
0804d113 | 2227 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2228 | return rc; |
2229 | } | |
2230 | ||
2231 | /** | |
2232 | * security_netif_sid - Obtain the SID for a network interface. | |
2233 | * @name: interface name | |
2234 | * @if_sid: interface SID | |
1da177e4 | 2235 | */ |
e8bfdb9d | 2236 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
2237 | { |
2238 | int rc = 0; | |
2239 | struct ocontext *c; | |
2240 | ||
0804d113 | 2241 | read_lock(&policy_rwlock); |
1da177e4 LT |
2242 | |
2243 | c = policydb.ocontexts[OCON_NETIF]; | |
2244 | while (c) { | |
2245 | if (strcmp(name, c->u.name) == 0) | |
2246 | break; | |
2247 | c = c->next; | |
2248 | } | |
2249 | ||
2250 | if (c) { | |
2251 | if (!c->sid[0] || !c->sid[1]) { | |
2252 | rc = sidtab_context_to_sid(&sidtab, | |
2253 | &c->context[0], | |
2254 | &c->sid[0]); | |
2255 | if (rc) | |
2256 | goto out; | |
2257 | rc = sidtab_context_to_sid(&sidtab, | |
2258 | &c->context[1], | |
2259 | &c->sid[1]); | |
2260 | if (rc) | |
2261 | goto out; | |
2262 | } | |
2263 | *if_sid = c->sid[0]; | |
e8bfdb9d | 2264 | } else |
1da177e4 | 2265 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
2266 | |
2267 | out: | |
0804d113 | 2268 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2269 | return rc; |
2270 | } | |
2271 | ||
2272 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
2273 | { | |
2274 | int i, fail = 0; | |
2275 | ||
5d55a345 EP |
2276 | for (i = 0; i < 4; i++) |
2277 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
2278 | fail = 1; |
2279 | break; | |
2280 | } | |
2281 | ||
2282 | return !fail; | |
2283 | } | |
2284 | ||
2285 | /** | |
2286 | * security_node_sid - Obtain the SID for a node (host). | |
2287 | * @domain: communication domain aka address family | |
2288 | * @addrp: address | |
2289 | * @addrlen: address length in bytes | |
2290 | * @out_sid: security identifier | |
2291 | */ | |
2292 | int security_node_sid(u16 domain, | |
2293 | void *addrp, | |
2294 | u32 addrlen, | |
2295 | u32 *out_sid) | |
2296 | { | |
4b02b524 | 2297 | int rc; |
1da177e4 LT |
2298 | struct ocontext *c; |
2299 | ||
0804d113 | 2300 | read_lock(&policy_rwlock); |
1da177e4 LT |
2301 | |
2302 | switch (domain) { | |
2303 | case AF_INET: { | |
2304 | u32 addr; | |
2305 | ||
4b02b524 EP |
2306 | rc = -EINVAL; |
2307 | if (addrlen != sizeof(u32)) | |
1da177e4 | 2308 | goto out; |
1da177e4 LT |
2309 | |
2310 | addr = *((u32 *)addrp); | |
2311 | ||
2312 | c = policydb.ocontexts[OCON_NODE]; | |
2313 | while (c) { | |
2314 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
2315 | break; | |
2316 | c = c->next; | |
2317 | } | |
2318 | break; | |
2319 | } | |
2320 | ||
2321 | case AF_INET6: | |
4b02b524 EP |
2322 | rc = -EINVAL; |
2323 | if (addrlen != sizeof(u64) * 2) | |
1da177e4 | 2324 | goto out; |
1da177e4 LT |
2325 | c = policydb.ocontexts[OCON_NODE6]; |
2326 | while (c) { | |
2327 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
2328 | c->u.node6.mask)) | |
2329 | break; | |
2330 | c = c->next; | |
2331 | } | |
2332 | break; | |
2333 | ||
2334 | default: | |
4b02b524 | 2335 | rc = 0; |
1da177e4 LT |
2336 | *out_sid = SECINITSID_NODE; |
2337 | goto out; | |
2338 | } | |
2339 | ||
2340 | if (c) { | |
2341 | if (!c->sid[0]) { | |
2342 | rc = sidtab_context_to_sid(&sidtab, | |
2343 | &c->context[0], | |
2344 | &c->sid[0]); | |
2345 | if (rc) | |
2346 | goto out; | |
2347 | } | |
2348 | *out_sid = c->sid[0]; | |
2349 | } else { | |
2350 | *out_sid = SECINITSID_NODE; | |
2351 | } | |
2352 | ||
4b02b524 | 2353 | rc = 0; |
1da177e4 | 2354 | out: |
0804d113 | 2355 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2356 | return rc; |
2357 | } | |
2358 | ||
2359 | #define SIDS_NEL 25 | |
2360 | ||
2361 | /** | |
2362 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
2363 | * @fromsid: starting SID | |
2364 | * @username: username | |
2365 | * @sids: array of reachable SIDs for user | |
2366 | * @nel: number of elements in @sids | |
2367 | * | |
2368 | * Generate the set of SIDs for legal security contexts | |
2369 | * for a given user that can be reached by @fromsid. | |
2370 | * Set *@sids to point to a dynamically allocated | |
2371 | * array containing the set of SIDs. Set *@nel to the | |
2372 | * number of elements in the array. | |
2373 | */ | |
2374 | ||
2375 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 2376 | char *username, |
1da177e4 LT |
2377 | u32 **sids, |
2378 | u32 *nel) | |
2379 | { | |
2380 | struct context *fromcon, usercon; | |
2c3c05db | 2381 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
2382 | u32 mynel = 0, maxnel = SIDS_NEL; |
2383 | struct user_datum *user; | |
2384 | struct role_datum *role; | |
782ebb99 | 2385 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
2386 | int rc = 0, i, j; |
2387 | ||
2c3c05db SS |
2388 | *sids = NULL; |
2389 | *nel = 0; | |
2390 | ||
2391 | if (!ss_initialized) | |
1da177e4 | 2392 | goto out; |
1da177e4 | 2393 | |
0804d113 | 2394 | read_lock(&policy_rwlock); |
1da177e4 | 2395 | |
12b29f34 SS |
2396 | context_init(&usercon); |
2397 | ||
4b02b524 | 2398 | rc = -EINVAL; |
1da177e4 | 2399 | fromcon = sidtab_search(&sidtab, fromsid); |
4b02b524 | 2400 | if (!fromcon) |
1da177e4 | 2401 | goto out_unlock; |
1da177e4 | 2402 | |
4b02b524 | 2403 | rc = -EINVAL; |
1da177e4 | 2404 | user = hashtab_search(policydb.p_users.table, username); |
4b02b524 | 2405 | if (!user) |
1da177e4 | 2406 | goto out_unlock; |
4b02b524 | 2407 | |
1da177e4 LT |
2408 | usercon.user = user->value; |
2409 | ||
4b02b524 | 2410 | rc = -ENOMEM; |
89d155ef | 2411 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
4b02b524 | 2412 | if (!mysids) |
1da177e4 | 2413 | goto out_unlock; |
1da177e4 | 2414 | |
9fe79ad1 | 2415 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 | 2416 | role = policydb.role_val_to_struct[i]; |
c1a7368a | 2417 | usercon.role = i + 1; |
9fe79ad1 | 2418 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
c1a7368a | 2419 | usercon.type = j + 1; |
1da177e4 LT |
2420 | |
2421 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
2422 | continue; | |
2423 | ||
1da177e4 | 2424 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 2425 | if (rc) |
1da177e4 | 2426 | goto out_unlock; |
1da177e4 LT |
2427 | if (mynel < maxnel) { |
2428 | mysids[mynel++] = sid; | |
2429 | } else { | |
4b02b524 | 2430 | rc = -ENOMEM; |
1da177e4 | 2431 | maxnel += SIDS_NEL; |
89d155ef | 2432 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
4b02b524 | 2433 | if (!mysids2) |
1da177e4 | 2434 | goto out_unlock; |
1da177e4 LT |
2435 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2436 | kfree(mysids); | |
2437 | mysids = mysids2; | |
2438 | mysids[mynel++] = sid; | |
2439 | } | |
2440 | } | |
2441 | } | |
4b02b524 | 2442 | rc = 0; |
1da177e4 | 2443 | out_unlock: |
0804d113 | 2444 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2445 | if (rc || !mynel) { |
2446 | kfree(mysids); | |
2447 | goto out; | |
2448 | } | |
2449 | ||
4b02b524 | 2450 | rc = -ENOMEM; |
2c3c05db SS |
2451 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); |
2452 | if (!mysids2) { | |
2c3c05db SS |
2453 | kfree(mysids); |
2454 | goto out; | |
2455 | } | |
2456 | for (i = 0, j = 0; i < mynel; i++) { | |
f01e1af4 | 2457 | struct av_decision dummy_avd; |
2c3c05db | 2458 | rc = avc_has_perm_noaudit(fromsid, mysids[i], |
c6d3aaa4 | 2459 | SECCLASS_PROCESS, /* kernel value */ |
2c3c05db | 2460 | PROCESS__TRANSITION, AVC_STRICT, |
f01e1af4 | 2461 | &dummy_avd); |
2c3c05db SS |
2462 | if (!rc) |
2463 | mysids2[j++] = mysids[i]; | |
2464 | cond_resched(); | |
2465 | } | |
2466 | rc = 0; | |
2467 | kfree(mysids); | |
2468 | *sids = mysids2; | |
2469 | *nel = j; | |
1da177e4 LT |
2470 | out: |
2471 | return rc; | |
2472 | } | |
2473 | ||
2474 | /** | |
f31e7994 | 2475 | * __security_genfs_sid - Helper to obtain a SID for a file in a filesystem |
1da177e4 LT |
2476 | * @fstype: filesystem type |
2477 | * @path: path from root of mount | |
2478 | * @sclass: file security class | |
2479 | * @sid: SID for path | |
2480 | * | |
2481 | * Obtain a SID to use for a file in a filesystem that | |
2482 | * cannot support xattr or use a fixed labeling behavior like | |
2483 | * transition SIDs or task SIDs. | |
f31e7994 WL |
2484 | * |
2485 | * The caller must acquire the policy_rwlock before calling this function. | |
1da177e4 | 2486 | */ |
f31e7994 WL |
2487 | static inline int __security_genfs_sid(const char *fstype, |
2488 | char *path, | |
2489 | u16 orig_sclass, | |
2490 | u32 *sid) | |
1da177e4 LT |
2491 | { |
2492 | int len; | |
c6d3aaa4 | 2493 | u16 sclass; |
1da177e4 LT |
2494 | struct genfs *genfs; |
2495 | struct ocontext *c; | |
4b02b524 | 2496 | int rc, cmp = 0; |
1da177e4 | 2497 | |
b1aa5301 SS |
2498 | while (path[0] == '/' && path[1] == '/') |
2499 | path++; | |
2500 | ||
c6d3aaa4 | 2501 | sclass = unmap_class(orig_sclass); |
4b02b524 | 2502 | *sid = SECINITSID_UNLABELED; |
c6d3aaa4 | 2503 | |
1da177e4 LT |
2504 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { |
2505 | cmp = strcmp(fstype, genfs->fstype); | |
2506 | if (cmp <= 0) | |
2507 | break; | |
2508 | } | |
2509 | ||
4b02b524 EP |
2510 | rc = -ENOENT; |
2511 | if (!genfs || cmp) | |
1da177e4 | 2512 | goto out; |
1da177e4 LT |
2513 | |
2514 | for (c = genfs->head; c; c = c->next) { | |
2515 | len = strlen(c->u.name); | |
2516 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2517 | (strncmp(c->u.name, path, len) == 0)) | |
2518 | break; | |
2519 | } | |
2520 | ||
4b02b524 EP |
2521 | rc = -ENOENT; |
2522 | if (!c) | |
1da177e4 | 2523 | goto out; |
1da177e4 LT |
2524 | |
2525 | if (!c->sid[0]) { | |
4b02b524 | 2526 | rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]); |
1da177e4 LT |
2527 | if (rc) |
2528 | goto out; | |
2529 | } | |
2530 | ||
2531 | *sid = c->sid[0]; | |
4b02b524 | 2532 | rc = 0; |
1da177e4 | 2533 | out: |
1da177e4 LT |
2534 | return rc; |
2535 | } | |
2536 | ||
f31e7994 WL |
2537 | /** |
2538 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2539 | * @fstype: filesystem type | |
2540 | * @path: path from root of mount | |
2541 | * @sclass: file security class | |
2542 | * @sid: SID for path | |
2543 | * | |
2544 | * Acquire policy_rwlock before calling __security_genfs_sid() and release | |
2545 | * it afterward. | |
2546 | */ | |
2547 | int security_genfs_sid(const char *fstype, | |
2548 | char *path, | |
2549 | u16 orig_sclass, | |
2550 | u32 *sid) | |
2551 | { | |
2552 | int retval; | |
2553 | ||
2554 | read_lock(&policy_rwlock); | |
2555 | retval = __security_genfs_sid(fstype, path, orig_sclass, sid); | |
2556 | read_unlock(&policy_rwlock); | |
2557 | return retval; | |
2558 | } | |
2559 | ||
1da177e4 LT |
2560 | /** |
2561 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
a64c54cf | 2562 | * @sb: superblock in question |
1da177e4 | 2563 | */ |
a64c54cf | 2564 | int security_fs_use(struct super_block *sb) |
1da177e4 LT |
2565 | { |
2566 | int rc = 0; | |
2567 | struct ocontext *c; | |
a64c54cf EP |
2568 | struct superblock_security_struct *sbsec = sb->s_security; |
2569 | const char *fstype = sb->s_type->name; | |
1da177e4 | 2570 | |
0804d113 | 2571 | read_lock(&policy_rwlock); |
1da177e4 | 2572 | |
4d546f81 PM |
2573 | c = policydb.ocontexts[OCON_FSUSE]; |
2574 | while (c) { | |
2575 | if (strcmp(fstype, c->u.name) == 0) | |
1da177e4 | 2576 | break; |
4d546f81 | 2577 | c = c->next; |
1da177e4 LT |
2578 | } |
2579 | ||
2580 | if (c) { | |
a64c54cf | 2581 | sbsec->behavior = c->v.behavior; |
1da177e4 | 2582 | if (!c->sid[0]) { |
4b02b524 | 2583 | rc = sidtab_context_to_sid(&sidtab, &c->context[0], |
1da177e4 LT |
2584 | &c->sid[0]); |
2585 | if (rc) | |
2586 | goto out; | |
2587 | } | |
a64c54cf | 2588 | sbsec->sid = c->sid[0]; |
1da177e4 | 2589 | } else { |
f31e7994 WL |
2590 | rc = __security_genfs_sid(fstype, "/", SECCLASS_DIR, |
2591 | &sbsec->sid); | |
089be43e | 2592 | if (rc) { |
a64c54cf | 2593 | sbsec->behavior = SECURITY_FS_USE_NONE; |
089be43e JM |
2594 | rc = 0; |
2595 | } else { | |
a64c54cf | 2596 | sbsec->behavior = SECURITY_FS_USE_GENFS; |
089be43e | 2597 | } |
1da177e4 LT |
2598 | } |
2599 | ||
2600 | out: | |
0804d113 | 2601 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2602 | return rc; |
2603 | } | |
2604 | ||
2605 | int security_get_bools(int *len, char ***names, int **values) | |
2606 | { | |
4b02b524 | 2607 | int i, rc; |
1da177e4 | 2608 | |
0804d113 | 2609 | read_lock(&policy_rwlock); |
1da177e4 LT |
2610 | *names = NULL; |
2611 | *values = NULL; | |
2612 | ||
4b02b524 | 2613 | rc = 0; |
1da177e4 | 2614 | *len = policydb.p_bools.nprim; |
4b02b524 | 2615 | if (!*len) |
1da177e4 | 2616 | goto out; |
1da177e4 | 2617 | |
4b02b524 EP |
2618 | rc = -ENOMEM; |
2619 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); | |
1da177e4 LT |
2620 | if (!*names) |
2621 | goto err; | |
1da177e4 | 2622 | |
4b02b524 EP |
2623 | rc = -ENOMEM; |
2624 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); | |
1da177e4 LT |
2625 | if (!*values) |
2626 | goto err; | |
2627 | ||
2628 | for (i = 0; i < *len; i++) { | |
1da177e4 | 2629 | (*values)[i] = policydb.bool_val_to_struct[i]->state; |
4b02b524 EP |
2630 | |
2631 | rc = -ENOMEM; | |
21b76f19 | 2632 | (*names)[i] = kstrdup(sym_name(&policydb, SYM_BOOLS, i), GFP_ATOMIC); |
1da177e4 LT |
2633 | if (!(*names)[i]) |
2634 | goto err; | |
1da177e4 LT |
2635 | } |
2636 | rc = 0; | |
2637 | out: | |
0804d113 | 2638 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2639 | return rc; |
2640 | err: | |
2641 | if (*names) { | |
2642 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2643 | kfree((*names)[i]); |
1da177e4 | 2644 | } |
9a5f04bf | 2645 | kfree(*values); |
1da177e4 LT |
2646 | goto out; |
2647 | } | |
2648 | ||
2649 | ||
2650 | int security_set_bools(int len, int *values) | |
2651 | { | |
4b02b524 | 2652 | int i, rc; |
1da177e4 LT |
2653 | int lenp, seqno = 0; |
2654 | struct cond_node *cur; | |
2655 | ||
0804d113 | 2656 | write_lock_irq(&policy_rwlock); |
1da177e4 | 2657 | |
4b02b524 | 2658 | rc = -EFAULT; |
1da177e4 | 2659 | lenp = policydb.p_bools.nprim; |
4b02b524 | 2660 | if (len != lenp) |
1da177e4 | 2661 | goto out; |
1da177e4 | 2662 | |
1da177e4 | 2663 | for (i = 0; i < len; i++) { |
af601e46 SG |
2664 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2665 | audit_log(current->audit_context, GFP_ATOMIC, | |
2666 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2667 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
ac76c05b | 2668 | sym_name(&policydb, SYM_BOOLS, i), |
af601e46 SG |
2669 | !!values[i], |
2670 | policydb.bool_val_to_struct[i]->state, | |
581abc09 | 2671 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 2672 | audit_get_sessionid(current)); |
af601e46 | 2673 | } |
5d55a345 | 2674 | if (values[i]) |
1da177e4 | 2675 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2676 | else |
1da177e4 | 2677 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2678 | } |
1da177e4 | 2679 | |
dbc74c65 | 2680 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2681 | rc = evaluate_cond_node(&policydb, cur); |
2682 | if (rc) | |
2683 | goto out; | |
2684 | } | |
2685 | ||
2686 | seqno = ++latest_granting; | |
4b02b524 | 2687 | rc = 0; |
1da177e4 | 2688 | out: |
0804d113 | 2689 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2690 | if (!rc) { |
2691 | avc_ss_reset(seqno); | |
2692 | selnl_notify_policyload(seqno); | |
11904167 | 2693 | selinux_status_update_policyload(seqno); |
342a0cff | 2694 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2695 | } |
2696 | return rc; | |
2697 | } | |
2698 | ||
2699 | int security_get_bool_value(int bool) | |
2700 | { | |
4b02b524 | 2701 | int rc; |
1da177e4 LT |
2702 | int len; |
2703 | ||
0804d113 | 2704 | read_lock(&policy_rwlock); |
1da177e4 | 2705 | |
4b02b524 | 2706 | rc = -EFAULT; |
1da177e4 | 2707 | len = policydb.p_bools.nprim; |
4b02b524 | 2708 | if (bool >= len) |
1da177e4 | 2709 | goto out; |
1da177e4 LT |
2710 | |
2711 | rc = policydb.bool_val_to_struct[bool]->state; | |
2712 | out: | |
0804d113 | 2713 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2714 | return rc; |
2715 | } | |
376bd9cb | 2716 | |
e900a7d9 SS |
2717 | static int security_preserve_bools(struct policydb *p) |
2718 | { | |
2719 | int rc, nbools = 0, *bvalues = NULL, i; | |
2720 | char **bnames = NULL; | |
2721 | struct cond_bool_datum *booldatum; | |
2722 | struct cond_node *cur; | |
2723 | ||
2724 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2725 | if (rc) | |
2726 | goto out; | |
2727 | for (i = 0; i < nbools; i++) { | |
2728 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2729 | if (booldatum) | |
2730 | booldatum->state = bvalues[i]; | |
2731 | } | |
dbc74c65 | 2732 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2733 | rc = evaluate_cond_node(p, cur); |
2734 | if (rc) | |
2735 | goto out; | |
2736 | } | |
2737 | ||
2738 | out: | |
2739 | if (bnames) { | |
2740 | for (i = 0; i < nbools; i++) | |
2741 | kfree(bnames[i]); | |
2742 | } | |
2743 | kfree(bnames); | |
2744 | kfree(bvalues); | |
2745 | return rc; | |
2746 | } | |
2747 | ||
08554d6b VY |
2748 | /* |
2749 | * security_sid_mls_copy() - computes a new sid based on the given | |
2750 | * sid and the mls portion of mls_sid. | |
2751 | */ | |
2752 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2753 | { | |
2754 | struct context *context1; | |
2755 | struct context *context2; | |
2756 | struct context newcon; | |
2757 | char *s; | |
2758 | u32 len; | |
4b02b524 | 2759 | int rc; |
08554d6b | 2760 | |
4b02b524 | 2761 | rc = 0; |
0719aaf5 | 2762 | if (!ss_initialized || !policydb.mls_enabled) { |
08554d6b VY |
2763 | *new_sid = sid; |
2764 | goto out; | |
2765 | } | |
2766 | ||
2767 | context_init(&newcon); | |
2768 | ||
0804d113 | 2769 | read_lock(&policy_rwlock); |
4b02b524 EP |
2770 | |
2771 | rc = -EINVAL; | |
08554d6b VY |
2772 | context1 = sidtab_search(&sidtab, sid); |
2773 | if (!context1) { | |
744ba35e EP |
2774 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2775 | __func__, sid); | |
08554d6b VY |
2776 | goto out_unlock; |
2777 | } | |
2778 | ||
4b02b524 | 2779 | rc = -EINVAL; |
08554d6b VY |
2780 | context2 = sidtab_search(&sidtab, mls_sid); |
2781 | if (!context2) { | |
744ba35e EP |
2782 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2783 | __func__, mls_sid); | |
08554d6b VY |
2784 | goto out_unlock; |
2785 | } | |
2786 | ||
2787 | newcon.user = context1->user; | |
2788 | newcon.role = context1->role; | |
2789 | newcon.type = context1->type; | |
0efc61ea | 2790 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2791 | if (rc) |
2792 | goto out_unlock; | |
2793 | ||
08554d6b VY |
2794 | /* Check the validity of the new context. */ |
2795 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2796 | rc = convert_context_handle_invalid_context(&newcon); | |
4b02b524 EP |
2797 | if (rc) { |
2798 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
4093a844 RGB |
2799 | audit_log(current->audit_context, |
2800 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2801 | "op=security_sid_mls_copy " | |
2802 | "invalid_context=%s", s); | |
4b02b524 EP |
2803 | kfree(s); |
2804 | } | |
2805 | goto out_unlock; | |
2806 | } | |
08554d6b VY |
2807 | } |
2808 | ||
2809 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
08554d6b | 2810 | out_unlock: |
0804d113 | 2811 | read_unlock(&policy_rwlock); |
08554d6b VY |
2812 | context_destroy(&newcon); |
2813 | out: | |
2814 | return rc; | |
2815 | } | |
2816 | ||
220deb96 PM |
2817 | /** |
2818 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2819 | * @nlbl_sid: NetLabel SID | |
2820 | * @nlbl_type: NetLabel labeling protocol type | |
2821 | * @xfrm_sid: XFRM SID | |
2822 | * | |
2823 | * Description: | |
2824 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2825 | * resolved into a single SID it is returned via @peer_sid and the function | |
2826 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2827 | * returns a negative value. A table summarizing the behavior is below: | |
2828 | * | |
2829 | * | function return | @sid | |
2830 | * ------------------------------+-----------------+----------------- | |
2831 | * no peer labels | 0 | SECSID_NULL | |
2832 | * single peer label | 0 | <peer_label> | |
2833 | * multiple, consistent labels | 0 | <peer_label> | |
2834 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2835 | * | |
2836 | */ | |
2837 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2838 | u32 xfrm_sid, | |
2839 | u32 *peer_sid) | |
2840 | { | |
2841 | int rc; | |
2842 | struct context *nlbl_ctx; | |
2843 | struct context *xfrm_ctx; | |
2844 | ||
4b02b524 EP |
2845 | *peer_sid = SECSID_NULL; |
2846 | ||
220deb96 PM |
2847 | /* handle the common (which also happens to be the set of easy) cases |
2848 | * right away, these two if statements catch everything involving a | |
2849 | * single or absent peer SID/label */ | |
2850 | if (xfrm_sid == SECSID_NULL) { | |
2851 | *peer_sid = nlbl_sid; | |
2852 | return 0; | |
2853 | } | |
2854 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2855 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2856 | * is present */ | |
2857 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2858 | *peer_sid = xfrm_sid; | |
2859 | return 0; | |
2860 | } | |
2861 | ||
2862 | /* we don't need to check ss_initialized here since the only way both | |
2863 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2864 | * security server was initialized and ss_initialized was true */ | |
4b02b524 | 2865 | if (!policydb.mls_enabled) |
220deb96 | 2866 | return 0; |
220deb96 | 2867 | |
0804d113 | 2868 | read_lock(&policy_rwlock); |
220deb96 | 2869 | |
4b02b524 | 2870 | rc = -EINVAL; |
220deb96 PM |
2871 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); |
2872 | if (!nlbl_ctx) { | |
744ba35e EP |
2873 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2874 | __func__, nlbl_sid); | |
4b02b524 | 2875 | goto out; |
220deb96 | 2876 | } |
4b02b524 | 2877 | rc = -EINVAL; |
220deb96 PM |
2878 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); |
2879 | if (!xfrm_ctx) { | |
744ba35e EP |
2880 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2881 | __func__, xfrm_sid); | |
4b02b524 | 2882 | goto out; |
220deb96 PM |
2883 | } |
2884 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
4b02b524 EP |
2885 | if (rc) |
2886 | goto out; | |
220deb96 | 2887 | |
4b02b524 EP |
2888 | /* at present NetLabel SIDs/labels really only carry MLS |
2889 | * information so if the MLS portion of the NetLabel SID | |
2890 | * matches the MLS portion of the labeled XFRM SID/label | |
2891 | * then pass along the XFRM SID as it is the most | |
2892 | * expressive */ | |
2893 | *peer_sid = xfrm_sid; | |
2894 | out: | |
0804d113 | 2895 | read_unlock(&policy_rwlock); |
220deb96 PM |
2896 | return rc; |
2897 | } | |
2898 | ||
55fcf09b CP |
2899 | static int get_classes_callback(void *k, void *d, void *args) |
2900 | { | |
2901 | struct class_datum *datum = d; | |
2902 | char *name = k, **classes = args; | |
2903 | int value = datum->value - 1; | |
2904 | ||
2905 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2906 | if (!classes[value]) | |
2907 | return -ENOMEM; | |
2908 | ||
2909 | return 0; | |
2910 | } | |
2911 | ||
2912 | int security_get_classes(char ***classes, int *nclasses) | |
2913 | { | |
4b02b524 | 2914 | int rc; |
55fcf09b | 2915 | |
0804d113 | 2916 | read_lock(&policy_rwlock); |
55fcf09b | 2917 | |
4b02b524 | 2918 | rc = -ENOMEM; |
55fcf09b | 2919 | *nclasses = policydb.p_classes.nprim; |
9f59f90b | 2920 | *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC); |
55fcf09b CP |
2921 | if (!*classes) |
2922 | goto out; | |
2923 | ||
2924 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2925 | *classes); | |
4b02b524 | 2926 | if (rc) { |
55fcf09b CP |
2927 | int i; |
2928 | for (i = 0; i < *nclasses; i++) | |
2929 | kfree((*classes)[i]); | |
2930 | kfree(*classes); | |
2931 | } | |
2932 | ||
2933 | out: | |
0804d113 | 2934 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2935 | return rc; |
2936 | } | |
2937 | ||
2938 | static int get_permissions_callback(void *k, void *d, void *args) | |
2939 | { | |
2940 | struct perm_datum *datum = d; | |
2941 | char *name = k, **perms = args; | |
2942 | int value = datum->value - 1; | |
2943 | ||
2944 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2945 | if (!perms[value]) | |
2946 | return -ENOMEM; | |
2947 | ||
2948 | return 0; | |
2949 | } | |
2950 | ||
2951 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2952 | { | |
4b02b524 | 2953 | int rc, i; |
55fcf09b CP |
2954 | struct class_datum *match; |
2955 | ||
0804d113 | 2956 | read_lock(&policy_rwlock); |
55fcf09b | 2957 | |
4b02b524 | 2958 | rc = -EINVAL; |
55fcf09b CP |
2959 | match = hashtab_search(policydb.p_classes.table, class); |
2960 | if (!match) { | |
744ba35e | 2961 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2962 | __func__, class); |
55fcf09b CP |
2963 | goto out; |
2964 | } | |
2965 | ||
4b02b524 | 2966 | rc = -ENOMEM; |
55fcf09b | 2967 | *nperms = match->permissions.nprim; |
9f59f90b | 2968 | *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC); |
55fcf09b CP |
2969 | if (!*perms) |
2970 | goto out; | |
2971 | ||
2972 | if (match->comdatum) { | |
2973 | rc = hashtab_map(match->comdatum->permissions.table, | |
2974 | get_permissions_callback, *perms); | |
4b02b524 | 2975 | if (rc) |
55fcf09b CP |
2976 | goto err; |
2977 | } | |
2978 | ||
2979 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2980 | *perms); | |
4b02b524 | 2981 | if (rc) |
55fcf09b CP |
2982 | goto err; |
2983 | ||
2984 | out: | |
0804d113 | 2985 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2986 | return rc; |
2987 | ||
2988 | err: | |
0804d113 | 2989 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2990 | for (i = 0; i < *nperms; i++) |
2991 | kfree((*perms)[i]); | |
2992 | kfree(*perms); | |
2993 | return rc; | |
2994 | } | |
2995 | ||
3f12070e EP |
2996 | int security_get_reject_unknown(void) |
2997 | { | |
2998 | return policydb.reject_unknown; | |
2999 | } | |
3000 | ||
3001 | int security_get_allow_unknown(void) | |
3002 | { | |
3003 | return policydb.allow_unknown; | |
3004 | } | |
3005 | ||
3bb56b25 PM |
3006 | /** |
3007 | * security_policycap_supported - Check for a specific policy capability | |
3008 | * @req_cap: capability | |
3009 | * | |
3010 | * Description: | |
3011 | * This function queries the currently loaded policy to see if it supports the | |
3012 | * capability specified by @req_cap. Returns true (1) if the capability is | |
3013 | * supported, false (0) if it isn't supported. | |
3014 | * | |
3015 | */ | |
3016 | int security_policycap_supported(unsigned int req_cap) | |
3017 | { | |
3018 | int rc; | |
3019 | ||
0804d113 | 3020 | read_lock(&policy_rwlock); |
3bb56b25 | 3021 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 3022 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
3023 | |
3024 | return rc; | |
3025 | } | |
3026 | ||
376bd9cb DG |
3027 | struct selinux_audit_rule { |
3028 | u32 au_seqno; | |
3029 | struct context au_ctxt; | |
3030 | }; | |
3031 | ||
9d57a7f9 | 3032 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 3033 | { |
9d57a7f9 AD |
3034 | struct selinux_audit_rule *rule = vrule; |
3035 | ||
376bd9cb DG |
3036 | if (rule) { |
3037 | context_destroy(&rule->au_ctxt); | |
3038 | kfree(rule); | |
3039 | } | |
3040 | } | |
3041 | ||
9d57a7f9 | 3042 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
3043 | { |
3044 | struct selinux_audit_rule *tmprule; | |
3045 | struct role_datum *roledatum; | |
3046 | struct type_datum *typedatum; | |
3047 | struct user_datum *userdatum; | |
9d57a7f9 | 3048 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
3049 | int rc = 0; |
3050 | ||
3051 | *rule = NULL; | |
3052 | ||
3053 | if (!ss_initialized) | |
3ad40d64 | 3054 | return -EOPNOTSUPP; |
376bd9cb DG |
3055 | |
3056 | switch (field) { | |
3a6b9f85 DG |
3057 | case AUDIT_SUBJ_USER: |
3058 | case AUDIT_SUBJ_ROLE: | |
3059 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
3060 | case AUDIT_OBJ_USER: |
3061 | case AUDIT_OBJ_ROLE: | |
3062 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 3063 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 3064 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
3065 | return -EINVAL; |
3066 | break; | |
3a6b9f85 DG |
3067 | case AUDIT_SUBJ_SEN: |
3068 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3069 | case AUDIT_OBJ_LEV_LOW: |
3070 | case AUDIT_OBJ_LEV_HIGH: | |
25985edc | 3071 | /* we do not allow a range, indicated by the presence of '-' */ |
376bd9cb DG |
3072 | if (strchr(rulestr, '-')) |
3073 | return -EINVAL; | |
3074 | break; | |
3075 | default: | |
3076 | /* only the above fields are valid */ | |
3077 | return -EINVAL; | |
3078 | } | |
3079 | ||
3080 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
3081 | if (!tmprule) | |
3082 | return -ENOMEM; | |
3083 | ||
3084 | context_init(&tmprule->au_ctxt); | |
3085 | ||
0804d113 | 3086 | read_lock(&policy_rwlock); |
376bd9cb DG |
3087 | |
3088 | tmprule->au_seqno = latest_granting; | |
3089 | ||
3090 | switch (field) { | |
3a6b9f85 | 3091 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 3092 | case AUDIT_OBJ_USER: |
4b02b524 | 3093 | rc = -EINVAL; |
376bd9cb DG |
3094 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
3095 | if (!userdatum) | |
4b02b524 EP |
3096 | goto out; |
3097 | tmprule->au_ctxt.user = userdatum->value; | |
376bd9cb | 3098 | break; |
3a6b9f85 | 3099 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 3100 | case AUDIT_OBJ_ROLE: |
4b02b524 | 3101 | rc = -EINVAL; |
376bd9cb DG |
3102 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
3103 | if (!roledatum) | |
4b02b524 EP |
3104 | goto out; |
3105 | tmprule->au_ctxt.role = roledatum->value; | |
376bd9cb | 3106 | break; |
3a6b9f85 | 3107 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 3108 | case AUDIT_OBJ_TYPE: |
4b02b524 | 3109 | rc = -EINVAL; |
376bd9cb DG |
3110 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
3111 | if (!typedatum) | |
4b02b524 EP |
3112 | goto out; |
3113 | tmprule->au_ctxt.type = typedatum->value; | |
376bd9cb | 3114 | break; |
3a6b9f85 DG |
3115 | case AUDIT_SUBJ_SEN: |
3116 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3117 | case AUDIT_OBJ_LEV_LOW: |
3118 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb | 3119 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
4b02b524 EP |
3120 | if (rc) |
3121 | goto out; | |
376bd9cb DG |
3122 | break; |
3123 | } | |
4b02b524 EP |
3124 | rc = 0; |
3125 | out: | |
0804d113 | 3126 | read_unlock(&policy_rwlock); |
376bd9cb DG |
3127 | |
3128 | if (rc) { | |
3129 | selinux_audit_rule_free(tmprule); | |
3130 | tmprule = NULL; | |
3131 | } | |
3132 | ||
3133 | *rule = tmprule; | |
3134 | ||
3135 | return rc; | |
3136 | } | |
3137 | ||
9d57a7f9 AD |
3138 | /* Check to see if the rule contains any selinux fields */ |
3139 | int selinux_audit_rule_known(struct audit_krule *rule) | |
3140 | { | |
3141 | int i; | |
3142 | ||
3143 | for (i = 0; i < rule->field_count; i++) { | |
3144 | struct audit_field *f = &rule->fields[i]; | |
3145 | switch (f->type) { | |
3146 | case AUDIT_SUBJ_USER: | |
3147 | case AUDIT_SUBJ_ROLE: | |
3148 | case AUDIT_SUBJ_TYPE: | |
3149 | case AUDIT_SUBJ_SEN: | |
3150 | case AUDIT_SUBJ_CLR: | |
3151 | case AUDIT_OBJ_USER: | |
3152 | case AUDIT_OBJ_ROLE: | |
3153 | case AUDIT_OBJ_TYPE: | |
3154 | case AUDIT_OBJ_LEV_LOW: | |
3155 | case AUDIT_OBJ_LEV_HIGH: | |
3156 | return 1; | |
3157 | } | |
3158 | } | |
3159 | ||
3160 | return 0; | |
3161 | } | |
3162 | ||
3163 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 3164 | struct audit_context *actx) |
376bd9cb DG |
3165 | { |
3166 | struct context *ctxt; | |
3167 | struct mls_level *level; | |
9d57a7f9 | 3168 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
3169 | int match = 0; |
3170 | ||
9ad42a79 RGB |
3171 | if (unlikely(!rule)) { |
3172 | WARN_ONCE(1, "selinux_audit_rule_match: missing rule\n"); | |
376bd9cb DG |
3173 | return -ENOENT; |
3174 | } | |
3175 | ||
0804d113 | 3176 | read_lock(&policy_rwlock); |
376bd9cb DG |
3177 | |
3178 | if (rule->au_seqno < latest_granting) { | |
376bd9cb DG |
3179 | match = -ESTALE; |
3180 | goto out; | |
3181 | } | |
3182 | ||
9a2f44f0 | 3183 | ctxt = sidtab_search(&sidtab, sid); |
9ad42a79 RGB |
3184 | if (unlikely(!ctxt)) { |
3185 | WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n", | |
5d55a345 | 3186 | sid); |
376bd9cb DG |
3187 | match = -ENOENT; |
3188 | goto out; | |
3189 | } | |
3190 | ||
3191 | /* a field/op pair that is not caught here will simply fall through | |
3192 | without a match */ | |
3193 | switch (field) { | |
3a6b9f85 | 3194 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 3195 | case AUDIT_OBJ_USER: |
376bd9cb | 3196 | switch (op) { |
5af75d8d | 3197 | case Audit_equal: |
376bd9cb DG |
3198 | match = (ctxt->user == rule->au_ctxt.user); |
3199 | break; | |
5af75d8d | 3200 | case Audit_not_equal: |
376bd9cb DG |
3201 | match = (ctxt->user != rule->au_ctxt.user); |
3202 | break; | |
3203 | } | |
3204 | break; | |
3a6b9f85 | 3205 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 3206 | case AUDIT_OBJ_ROLE: |
376bd9cb | 3207 | switch (op) { |
5af75d8d | 3208 | case Audit_equal: |
376bd9cb DG |
3209 | match = (ctxt->role == rule->au_ctxt.role); |
3210 | break; | |
5af75d8d | 3211 | case Audit_not_equal: |
376bd9cb DG |
3212 | match = (ctxt->role != rule->au_ctxt.role); |
3213 | break; | |
3214 | } | |
3215 | break; | |
3a6b9f85 | 3216 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 3217 | case AUDIT_OBJ_TYPE: |
376bd9cb | 3218 | switch (op) { |
5af75d8d | 3219 | case Audit_equal: |
376bd9cb DG |
3220 | match = (ctxt->type == rule->au_ctxt.type); |
3221 | break; | |
5af75d8d | 3222 | case Audit_not_equal: |
376bd9cb DG |
3223 | match = (ctxt->type != rule->au_ctxt.type); |
3224 | break; | |
3225 | } | |
3226 | break; | |
3a6b9f85 DG |
3227 | case AUDIT_SUBJ_SEN: |
3228 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3229 | case AUDIT_OBJ_LEV_LOW: |
3230 | case AUDIT_OBJ_LEV_HIGH: | |
3231 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
3232 | field == AUDIT_OBJ_LEV_LOW) ? |
3233 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 3234 | switch (op) { |
5af75d8d | 3235 | case Audit_equal: |
376bd9cb | 3236 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3237 | level); |
376bd9cb | 3238 | break; |
5af75d8d | 3239 | case Audit_not_equal: |
376bd9cb | 3240 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3241 | level); |
376bd9cb | 3242 | break; |
5af75d8d | 3243 | case Audit_lt: |
376bd9cb | 3244 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
3245 | level) && |
3246 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
3247 | level)); | |
376bd9cb | 3248 | break; |
5af75d8d | 3249 | case Audit_le: |
376bd9cb | 3250 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 3251 | level); |
376bd9cb | 3252 | break; |
5af75d8d | 3253 | case Audit_gt: |
376bd9cb | 3254 | match = (mls_level_dom(level, |
5d55a345 EP |
3255 | &rule->au_ctxt.range.level[0]) && |
3256 | !mls_level_eq(level, | |
3257 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 3258 | break; |
5af75d8d | 3259 | case Audit_ge: |
376bd9cb | 3260 | match = mls_level_dom(level, |
5d55a345 | 3261 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
3262 | break; |
3263 | } | |
3264 | } | |
3265 | ||
3266 | out: | |
0804d113 | 3267 | read_unlock(&policy_rwlock); |
376bd9cb DG |
3268 | return match; |
3269 | } | |
3270 | ||
9d57a7f9 | 3271 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb | 3272 | |
562c99f2 | 3273 | static int aurule_avc_callback(u32 event) |
376bd9cb DG |
3274 | { |
3275 | int err = 0; | |
3276 | ||
3277 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
3278 | err = aurule_callback(); | |
3279 | return err; | |
3280 | } | |
3281 | ||
3282 | static int __init aurule_init(void) | |
3283 | { | |
3284 | int err; | |
3285 | ||
562c99f2 | 3286 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET); |
376bd9cb DG |
3287 | if (err) |
3288 | panic("avc_add_callback() failed, error %d\n", err); | |
3289 | ||
3290 | return err; | |
3291 | } | |
3292 | __initcall(aurule_init); | |
3293 | ||
7420ed23 | 3294 | #ifdef CONFIG_NETLABEL |
7420ed23 | 3295 | /** |
5778eabd PM |
3296 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
3297 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 3298 | * @sid: the SELinux SID |
7420ed23 VY |
3299 | * |
3300 | * Description: | |
3301 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
3302 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
3303 | * already been initialized. | |
7420ed23 VY |
3304 | * |
3305 | */ | |
5778eabd | 3306 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 3307 | u32 sid) |
7420ed23 | 3308 | { |
5dbe1eb0 | 3309 | u32 *sid_cache; |
7420ed23 | 3310 | |
5dbe1eb0 PM |
3311 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
3312 | if (sid_cache == NULL) | |
5778eabd | 3313 | return; |
5dbe1eb0 PM |
3314 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
3315 | if (secattr->cache == NULL) { | |
3316 | kfree(sid_cache); | |
5778eabd | 3317 | return; |
0ec8abd7 | 3318 | } |
7420ed23 | 3319 | |
5dbe1eb0 PM |
3320 | *sid_cache = sid; |
3321 | secattr->cache->free = kfree; | |
3322 | secattr->cache->data = sid_cache; | |
5778eabd | 3323 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
3324 | } |
3325 | ||
3326 | /** | |
5778eabd | 3327 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 3328 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
3329 | * @sid: the SELinux SID |
3330 | * | |
3331 | * Description: | |
5778eabd | 3332 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 3333 | * SELinux SID. If the @secattr field does not contain a full SELinux |
25985edc | 3334 | * SID/context then use SECINITSID_NETMSG as the foundation. If possible the |
5dbe1eb0 PM |
3335 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to |
3336 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
3337 | * conversion for future lookups. Returns zero on success, negative values on | |
3338 | * failure. | |
7420ed23 VY |
3339 | * |
3340 | */ | |
5778eabd | 3341 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 3342 | u32 *sid) |
7420ed23 | 3343 | { |
7ae9f23c | 3344 | int rc; |
7420ed23 VY |
3345 | struct context *ctx; |
3346 | struct context ctx_new; | |
5778eabd PM |
3347 | |
3348 | if (!ss_initialized) { | |
3349 | *sid = SECSID_NULL; | |
3350 | return 0; | |
3351 | } | |
7420ed23 | 3352 | |
0804d113 | 3353 | read_lock(&policy_rwlock); |
7420ed23 | 3354 | |
7ae9f23c | 3355 | if (secattr->flags & NETLBL_SECATTR_CACHE) |
5dbe1eb0 | 3356 | *sid = *(u32 *)secattr->cache->data; |
7ae9f23c | 3357 | else if (secattr->flags & NETLBL_SECATTR_SECID) |
16efd454 | 3358 | *sid = secattr->attr.secid; |
7ae9f23c EP |
3359 | else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
3360 | rc = -EIDRM; | |
5dbe1eb0 | 3361 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 | 3362 | if (ctx == NULL) |
7ae9f23c | 3363 | goto out; |
7420ed23 | 3364 | |
81990fbd | 3365 | context_init(&ctx_new); |
7420ed23 VY |
3366 | ctx_new.user = ctx->user; |
3367 | ctx_new.role = ctx->role; | |
3368 | ctx_new.type = ctx->type; | |
02752760 | 3369 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 3370 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
da8026fa | 3371 | rc = mls_import_netlbl_cat(&ctx_new, secattr); |
7ae9f23c EP |
3372 | if (rc) |
3373 | goto out; | |
7420ed23 | 3374 | } |
7ae9f23c EP |
3375 | rc = -EIDRM; |
3376 | if (!mls_context_isvalid(&policydb, &ctx_new)) | |
3377 | goto out_free; | |
7420ed23 VY |
3378 | |
3379 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
7ae9f23c EP |
3380 | if (rc) |
3381 | goto out_free; | |
7420ed23 | 3382 | |
5dbe1eb0 | 3383 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 3384 | |
7420ed23 | 3385 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c | 3386 | } else |
388b2405 | 3387 | *sid = SECSID_NULL; |
7420ed23 | 3388 | |
0804d113 | 3389 | read_unlock(&policy_rwlock); |
7ae9f23c EP |
3390 | return 0; |
3391 | out_free: | |
7420ed23 | 3392 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c EP |
3393 | out: |
3394 | read_unlock(&policy_rwlock); | |
3395 | return rc; | |
7420ed23 VY |
3396 | } |
3397 | ||
3398 | /** | |
5778eabd PM |
3399 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
3400 | * @sid: the SELinux SID | |
3401 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
3402 | * |
3403 | * Description: | |
5778eabd PM |
3404 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
3405 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
3406 | * |
3407 | */ | |
5778eabd | 3408 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 3409 | { |
99d854d2 | 3410 | int rc; |
7420ed23 VY |
3411 | struct context *ctx; |
3412 | ||
3413 | if (!ss_initialized) | |
3414 | return 0; | |
3415 | ||
0804d113 | 3416 | read_lock(&policy_rwlock); |
4b02b524 EP |
3417 | |
3418 | rc = -ENOENT; | |
7420ed23 | 3419 | ctx = sidtab_search(&sidtab, sid); |
4b02b524 EP |
3420 | if (ctx == NULL) |
3421 | goto out; | |
3422 | ||
3423 | rc = -ENOMEM; | |
ac76c05b | 3424 | secattr->domain = kstrdup(sym_name(&policydb, SYM_TYPES, ctx->type - 1), |
5778eabd | 3425 | GFP_ATOMIC); |
4b02b524 EP |
3426 | if (secattr->domain == NULL) |
3427 | goto out; | |
3428 | ||
8d75899d PM |
3429 | secattr->attr.secid = sid; |
3430 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
3431 | mls_export_netlbl_lvl(ctx, secattr); |
3432 | rc = mls_export_netlbl_cat(ctx, secattr); | |
4b02b524 | 3433 | out: |
0804d113 | 3434 | read_unlock(&policy_rwlock); |
f8687afe PM |
3435 | return rc; |
3436 | } | |
7420ed23 | 3437 | #endif /* CONFIG_NETLABEL */ |
cee74f47 EP |
3438 | |
3439 | /** | |
3440 | * security_read_policy - read the policy. | |
3441 | * @data: binary policy data | |
3442 | * @len: length of data in bytes | |
3443 | * | |
3444 | */ | |
6b697323 | 3445 | int security_read_policy(void **data, size_t *len) |
cee74f47 EP |
3446 | { |
3447 | int rc; | |
3448 | struct policy_file fp; | |
3449 | ||
3450 | if (!ss_initialized) | |
3451 | return -EINVAL; | |
3452 | ||
3453 | *len = security_policydb_len(); | |
3454 | ||
845ca30f | 3455 | *data = vmalloc_user(*len); |
cee74f47 EP |
3456 | if (!*data) |
3457 | return -ENOMEM; | |
3458 | ||
3459 | fp.data = *data; | |
3460 | fp.len = *len; | |
3461 | ||
3462 | read_lock(&policy_rwlock); | |
3463 | rc = policydb_write(&policydb, &fp); | |
3464 | read_unlock(&policy_rwlock); | |
3465 | ||
3466 | if (rc) | |
3467 | return rc; | |
3468 | ||
3469 | *len = (unsigned long)fp.data - (unsigned long)*data; | |
3470 | return 0; | |
3471 | ||
3472 | } |