Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> | |
5d55a345 | 5 | * James Morris <jmorris@redhat.com> |
1da177e4 LT |
6 | * |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
5d55a345 | 14 | * Added conditional policy language extensions |
1da177e4 | 15 | * |
82c21bfa | 16 | * Updated: Hewlett-Packard <paul@paul-moore.com> |
7420ed23 VY |
17 | * |
18 | * Added support for NetLabel | |
3bb56b25 | 19 | * Added support for the policy capability bitmap |
7420ed23 | 20 | * |
b94c7e67 CS |
21 | * Updated: Chad Sellers <csellers@tresys.com> |
22 | * | |
23 | * Added validation of kernel classes and permissions | |
24 | * | |
44c2d9bd KK |
25 | * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com> |
26 | * | |
27 | * Added support for bounds domain and audit messaged on masked permissions | |
28 | * | |
0719aaf5 GT |
29 | * Updated: Guido Trentalancia <guido@trentalancia.com> |
30 | * | |
31 | * Added support for runtime switching of the policy type | |
32 | * | |
44c2d9bd | 33 | * Copyright (C) 2008, 2009 NEC Corporation |
3bb56b25 | 34 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
376bd9cb | 35 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 36 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
37 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
38 | * This program is free software; you can redistribute it and/or modify | |
5d55a345 | 39 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
40 | * the Free Software Foundation, version 2. |
41 | */ | |
42 | #include <linux/kernel.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/spinlock.h> | |
9f2ad665 | 46 | #include <linux/rcupdate.h> |
1da177e4 LT |
47 | #include <linux/errno.h> |
48 | #include <linux/in.h> | |
49 | #include <linux/sched.h> | |
50 | #include <linux/audit.h> | |
bb003079 | 51 | #include <linux/mutex.h> |
0e55a004 | 52 | #include <linux/selinux.h> |
6371dcd3 | 53 | #include <linux/flex_array.h> |
f0d3d989 | 54 | #include <linux/vmalloc.h> |
7420ed23 | 55 | #include <net/netlabel.h> |
bb003079 | 56 | |
1da177e4 LT |
57 | #include "flask.h" |
58 | #include "avc.h" | |
59 | #include "avc_ss.h" | |
60 | #include "security.h" | |
61 | #include "context.h" | |
62 | #include "policydb.h" | |
63 | #include "sidtab.h" | |
64 | #include "services.h" | |
65 | #include "conditional.h" | |
66 | #include "mls.h" | |
7420ed23 | 67 | #include "objsec.h" |
c60475bf | 68 | #include "netlabel.h" |
3de4bab5 | 69 | #include "xfrm.h" |
02752760 | 70 | #include "ebitmap.h" |
9d57a7f9 | 71 | #include "audit.h" |
1da177e4 | 72 | |
3bb56b25 | 73 | int selinux_policycap_netpeer; |
b0c636b9 | 74 | int selinux_policycap_openperm; |
3bb56b25 | 75 | |
1da177e4 | 76 | static DEFINE_RWLOCK(policy_rwlock); |
1da177e4 LT |
77 | |
78 | static struct sidtab sidtab; | |
79 | struct policydb policydb; | |
5d55a345 | 80 | int ss_initialized; |
1da177e4 LT |
81 | |
82 | /* | |
83 | * The largest sequence number that has been used when | |
84 | * providing an access decision to the access vector cache. | |
85 | * The sequence number only changes when a policy change | |
86 | * occurs. | |
87 | */ | |
5d55a345 | 88 | static u32 latest_granting; |
1da177e4 LT |
89 | |
90 | /* Forward declaration. */ | |
91 | static int context_struct_to_string(struct context *context, char **scontext, | |
92 | u32 *scontext_len); | |
93 | ||
19439d05 SS |
94 | static void context_struct_compute_av(struct context *scontext, |
95 | struct context *tcontext, | |
96 | u16 tclass, | |
97 | struct av_decision *avd); | |
c6d3aaa4 SS |
98 | |
99 | struct selinux_mapping { | |
100 | u16 value; /* policy value */ | |
101 | unsigned num_perms; | |
102 | u32 perms[sizeof(u32) * 8]; | |
103 | }; | |
104 | ||
105 | static struct selinux_mapping *current_mapping; | |
106 | static u16 current_mapping_size; | |
107 | ||
108 | static int selinux_set_mapping(struct policydb *pol, | |
109 | struct security_class_mapping *map, | |
110 | struct selinux_mapping **out_map_p, | |
111 | u16 *out_map_size) | |
112 | { | |
113 | struct selinux_mapping *out_map = NULL; | |
114 | size_t size = sizeof(struct selinux_mapping); | |
115 | u16 i, j; | |
116 | unsigned k; | |
117 | bool print_unknown_handle = false; | |
118 | ||
119 | /* Find number of classes in the input mapping */ | |
120 | if (!map) | |
121 | return -EINVAL; | |
122 | i = 0; | |
123 | while (map[i].name) | |
124 | i++; | |
125 | ||
126 | /* Allocate space for the class records, plus one for class zero */ | |
127 | out_map = kcalloc(++i, size, GFP_ATOMIC); | |
128 | if (!out_map) | |
129 | return -ENOMEM; | |
130 | ||
131 | /* Store the raw class and permission values */ | |
132 | j = 0; | |
133 | while (map[j].name) { | |
134 | struct security_class_mapping *p_in = map + (j++); | |
135 | struct selinux_mapping *p_out = out_map + j; | |
136 | ||
137 | /* An empty class string skips ahead */ | |
138 | if (!strcmp(p_in->name, "")) { | |
139 | p_out->num_perms = 0; | |
140 | continue; | |
141 | } | |
142 | ||
143 | p_out->value = string_to_security_class(pol, p_in->name); | |
144 | if (!p_out->value) { | |
145 | printk(KERN_INFO | |
146 | "SELinux: Class %s not defined in policy.\n", | |
147 | p_in->name); | |
148 | if (pol->reject_unknown) | |
149 | goto err; | |
150 | p_out->num_perms = 0; | |
151 | print_unknown_handle = true; | |
152 | continue; | |
153 | } | |
154 | ||
155 | k = 0; | |
156 | while (p_in->perms && p_in->perms[k]) { | |
157 | /* An empty permission string skips ahead */ | |
158 | if (!*p_in->perms[k]) { | |
159 | k++; | |
160 | continue; | |
161 | } | |
162 | p_out->perms[k] = string_to_av_perm(pol, p_out->value, | |
163 | p_in->perms[k]); | |
164 | if (!p_out->perms[k]) { | |
165 | printk(KERN_INFO | |
166 | "SELinux: Permission %s in class %s not defined in policy.\n", | |
167 | p_in->perms[k], p_in->name); | |
168 | if (pol->reject_unknown) | |
169 | goto err; | |
170 | print_unknown_handle = true; | |
171 | } | |
172 | ||
173 | k++; | |
174 | } | |
175 | p_out->num_perms = k; | |
176 | } | |
177 | ||
178 | if (print_unknown_handle) | |
179 | printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n", | |
180 | pol->allow_unknown ? "allowed" : "denied"); | |
181 | ||
182 | *out_map_p = out_map; | |
183 | *out_map_size = i; | |
184 | return 0; | |
185 | err: | |
186 | kfree(out_map); | |
187 | return -EINVAL; | |
188 | } | |
189 | ||
190 | /* | |
191 | * Get real, policy values from mapped values | |
192 | */ | |
193 | ||
194 | static u16 unmap_class(u16 tclass) | |
195 | { | |
196 | if (tclass < current_mapping_size) | |
197 | return current_mapping[tclass].value; | |
198 | ||
199 | return tclass; | |
200 | } | |
201 | ||
6f5317e7 HC |
202 | /* |
203 | * Get kernel value for class from its policy value | |
204 | */ | |
205 | static u16 map_class(u16 pol_value) | |
206 | { | |
207 | u16 i; | |
208 | ||
209 | for (i = 1; i < current_mapping_size; i++) { | |
210 | if (current_mapping[i].value == pol_value) | |
211 | return i; | |
212 | } | |
213 | ||
85cd6da5 | 214 | return SECCLASS_NULL; |
6f5317e7 HC |
215 | } |
216 | ||
c6d3aaa4 SS |
217 | static void map_decision(u16 tclass, struct av_decision *avd, |
218 | int allow_unknown) | |
219 | { | |
220 | if (tclass < current_mapping_size) { | |
221 | unsigned i, n = current_mapping[tclass].num_perms; | |
222 | u32 result; | |
223 | ||
224 | for (i = 0, result = 0; i < n; i++) { | |
225 | if (avd->allowed & current_mapping[tclass].perms[i]) | |
226 | result |= 1<<i; | |
227 | if (allow_unknown && !current_mapping[tclass].perms[i]) | |
228 | result |= 1<<i; | |
229 | } | |
230 | avd->allowed = result; | |
231 | ||
232 | for (i = 0, result = 0; i < n; i++) | |
233 | if (avd->auditallow & current_mapping[tclass].perms[i]) | |
234 | result |= 1<<i; | |
235 | avd->auditallow = result; | |
236 | ||
237 | for (i = 0, result = 0; i < n; i++) { | |
238 | if (avd->auditdeny & current_mapping[tclass].perms[i]) | |
239 | result |= 1<<i; | |
240 | if (!allow_unknown && !current_mapping[tclass].perms[i]) | |
241 | result |= 1<<i; | |
242 | } | |
0bce9527 EP |
243 | /* |
244 | * In case the kernel has a bug and requests a permission | |
245 | * between num_perms and the maximum permission number, we | |
246 | * should audit that denial | |
247 | */ | |
248 | for (; i < (sizeof(u32)*8); i++) | |
249 | result |= 1<<i; | |
c6d3aaa4 SS |
250 | avd->auditdeny = result; |
251 | } | |
252 | } | |
253 | ||
0719aaf5 GT |
254 | int security_mls_enabled(void) |
255 | { | |
256 | return policydb.mls_enabled; | |
257 | } | |
c6d3aaa4 | 258 | |
1da177e4 LT |
259 | /* |
260 | * Return the boolean value of a constraint expression | |
261 | * when it is applied to the specified source and target | |
262 | * security contexts. | |
263 | * | |
264 | * xcontext is a special beast... It is used by the validatetrans rules | |
265 | * only. For these rules, scontext is the context before the transition, | |
266 | * tcontext is the context after the transition, and xcontext is the context | |
267 | * of the process performing the transition. All other callers of | |
268 | * constraint_expr_eval should pass in NULL for xcontext. | |
269 | */ | |
270 | static int constraint_expr_eval(struct context *scontext, | |
271 | struct context *tcontext, | |
272 | struct context *xcontext, | |
273 | struct constraint_expr *cexpr) | |
274 | { | |
275 | u32 val1, val2; | |
276 | struct context *c; | |
277 | struct role_datum *r1, *r2; | |
278 | struct mls_level *l1, *l2; | |
279 | struct constraint_expr *e; | |
280 | int s[CEXPR_MAXDEPTH]; | |
281 | int sp = -1; | |
282 | ||
283 | for (e = cexpr; e; e = e->next) { | |
284 | switch (e->expr_type) { | |
285 | case CEXPR_NOT: | |
286 | BUG_ON(sp < 0); | |
287 | s[sp] = !s[sp]; | |
288 | break; | |
289 | case CEXPR_AND: | |
290 | BUG_ON(sp < 1); | |
291 | sp--; | |
c1a7368a | 292 | s[sp] &= s[sp + 1]; |
1da177e4 LT |
293 | break; |
294 | case CEXPR_OR: | |
295 | BUG_ON(sp < 1); | |
296 | sp--; | |
c1a7368a | 297 | s[sp] |= s[sp + 1]; |
1da177e4 LT |
298 | break; |
299 | case CEXPR_ATTR: | |
c1a7368a | 300 | if (sp == (CEXPR_MAXDEPTH - 1)) |
1da177e4 LT |
301 | return 0; |
302 | switch (e->attr) { | |
303 | case CEXPR_USER: | |
304 | val1 = scontext->user; | |
305 | val2 = tcontext->user; | |
306 | break; | |
307 | case CEXPR_TYPE: | |
308 | val1 = scontext->type; | |
309 | val2 = tcontext->type; | |
310 | break; | |
311 | case CEXPR_ROLE: | |
312 | val1 = scontext->role; | |
313 | val2 = tcontext->role; | |
314 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
315 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
316 | switch (e->op) { | |
317 | case CEXPR_DOM: | |
318 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
319 | val2 - 1); | |
320 | continue; | |
321 | case CEXPR_DOMBY: | |
322 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
323 | val1 - 1); | |
324 | continue; | |
325 | case CEXPR_INCOMP: | |
5d55a345 EP |
326 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
327 | val2 - 1) && | |
328 | !ebitmap_get_bit(&r2->dominates, | |
329 | val1 - 1)); | |
1da177e4 LT |
330 | continue; |
331 | default: | |
332 | break; | |
333 | } | |
334 | break; | |
335 | case CEXPR_L1L2: | |
336 | l1 = &(scontext->range.level[0]); | |
337 | l2 = &(tcontext->range.level[0]); | |
338 | goto mls_ops; | |
339 | case CEXPR_L1H2: | |
340 | l1 = &(scontext->range.level[0]); | |
341 | l2 = &(tcontext->range.level[1]); | |
342 | goto mls_ops; | |
343 | case CEXPR_H1L2: | |
344 | l1 = &(scontext->range.level[1]); | |
345 | l2 = &(tcontext->range.level[0]); | |
346 | goto mls_ops; | |
347 | case CEXPR_H1H2: | |
348 | l1 = &(scontext->range.level[1]); | |
349 | l2 = &(tcontext->range.level[1]); | |
350 | goto mls_ops; | |
351 | case CEXPR_L1H1: | |
352 | l1 = &(scontext->range.level[0]); | |
353 | l2 = &(scontext->range.level[1]); | |
354 | goto mls_ops; | |
355 | case CEXPR_L2H2: | |
356 | l1 = &(tcontext->range.level[0]); | |
357 | l2 = &(tcontext->range.level[1]); | |
358 | goto mls_ops; | |
359 | mls_ops: | |
360 | switch (e->op) { | |
361 | case CEXPR_EQ: | |
362 | s[++sp] = mls_level_eq(l1, l2); | |
363 | continue; | |
364 | case CEXPR_NEQ: | |
365 | s[++sp] = !mls_level_eq(l1, l2); | |
366 | continue; | |
367 | case CEXPR_DOM: | |
368 | s[++sp] = mls_level_dom(l1, l2); | |
369 | continue; | |
370 | case CEXPR_DOMBY: | |
371 | s[++sp] = mls_level_dom(l2, l1); | |
372 | continue; | |
373 | case CEXPR_INCOMP: | |
374 | s[++sp] = mls_level_incomp(l2, l1); | |
375 | continue; | |
376 | default: | |
377 | BUG(); | |
378 | return 0; | |
379 | } | |
380 | break; | |
381 | default: | |
382 | BUG(); | |
383 | return 0; | |
384 | } | |
385 | ||
386 | switch (e->op) { | |
387 | case CEXPR_EQ: | |
388 | s[++sp] = (val1 == val2); | |
389 | break; | |
390 | case CEXPR_NEQ: | |
391 | s[++sp] = (val1 != val2); | |
392 | break; | |
393 | default: | |
394 | BUG(); | |
395 | return 0; | |
396 | } | |
397 | break; | |
398 | case CEXPR_NAMES: | |
399 | if (sp == (CEXPR_MAXDEPTH-1)) | |
400 | return 0; | |
401 | c = scontext; | |
402 | if (e->attr & CEXPR_TARGET) | |
403 | c = tcontext; | |
404 | else if (e->attr & CEXPR_XTARGET) { | |
405 | c = xcontext; | |
406 | if (!c) { | |
407 | BUG(); | |
408 | return 0; | |
409 | } | |
410 | } | |
411 | if (e->attr & CEXPR_USER) | |
412 | val1 = c->user; | |
413 | else if (e->attr & CEXPR_ROLE) | |
414 | val1 = c->role; | |
415 | else if (e->attr & CEXPR_TYPE) | |
416 | val1 = c->type; | |
417 | else { | |
418 | BUG(); | |
419 | return 0; | |
420 | } | |
421 | ||
422 | switch (e->op) { | |
423 | case CEXPR_EQ: | |
424 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
425 | break; | |
426 | case CEXPR_NEQ: | |
427 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
428 | break; | |
429 | default: | |
430 | BUG(); | |
431 | return 0; | |
432 | } | |
433 | break; | |
434 | default: | |
435 | BUG(); | |
436 | return 0; | |
437 | } | |
438 | } | |
439 | ||
440 | BUG_ON(sp != 0); | |
441 | return s[0]; | |
442 | } | |
443 | ||
44c2d9bd KK |
444 | /* |
445 | * security_dump_masked_av - dumps masked permissions during | |
446 | * security_compute_av due to RBAC, MLS/Constraint and Type bounds. | |
447 | */ | |
448 | static int dump_masked_av_helper(void *k, void *d, void *args) | |
449 | { | |
450 | struct perm_datum *pdatum = d; | |
451 | char **permission_names = args; | |
452 | ||
453 | BUG_ON(pdatum->value < 1 || pdatum->value > 32); | |
454 | ||
455 | permission_names[pdatum->value - 1] = (char *)k; | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | static void security_dump_masked_av(struct context *scontext, | |
461 | struct context *tcontext, | |
462 | u16 tclass, | |
463 | u32 permissions, | |
464 | const char *reason) | |
465 | { | |
466 | struct common_datum *common_dat; | |
467 | struct class_datum *tclass_dat; | |
468 | struct audit_buffer *ab; | |
469 | char *tclass_name; | |
470 | char *scontext_name = NULL; | |
471 | char *tcontext_name = NULL; | |
472 | char *permission_names[32]; | |
2da5d31b JM |
473 | int index; |
474 | u32 length; | |
44c2d9bd KK |
475 | bool need_comma = false; |
476 | ||
477 | if (!permissions) | |
478 | return; | |
479 | ||
ac76c05b | 480 | tclass_name = sym_name(&policydb, SYM_CLASSES, tclass - 1); |
44c2d9bd KK |
481 | tclass_dat = policydb.class_val_to_struct[tclass - 1]; |
482 | common_dat = tclass_dat->comdatum; | |
483 | ||
484 | /* init permission_names */ | |
485 | if (common_dat && | |
486 | hashtab_map(common_dat->permissions.table, | |
487 | dump_masked_av_helper, permission_names) < 0) | |
488 | goto out; | |
489 | ||
490 | if (hashtab_map(tclass_dat->permissions.table, | |
491 | dump_masked_av_helper, permission_names) < 0) | |
492 | goto out; | |
493 | ||
494 | /* get scontext/tcontext in text form */ | |
495 | if (context_struct_to_string(scontext, | |
496 | &scontext_name, &length) < 0) | |
497 | goto out; | |
498 | ||
499 | if (context_struct_to_string(tcontext, | |
500 | &tcontext_name, &length) < 0) | |
501 | goto out; | |
502 | ||
503 | /* audit a message */ | |
504 | ab = audit_log_start(current->audit_context, | |
505 | GFP_ATOMIC, AUDIT_SELINUX_ERR); | |
506 | if (!ab) | |
507 | goto out; | |
508 | ||
509 | audit_log_format(ab, "op=security_compute_av reason=%s " | |
510 | "scontext=%s tcontext=%s tclass=%s perms=", | |
511 | reason, scontext_name, tcontext_name, tclass_name); | |
512 | ||
513 | for (index = 0; index < 32; index++) { | |
514 | u32 mask = (1 << index); | |
515 | ||
516 | if ((mask & permissions) == 0) | |
517 | continue; | |
518 | ||
519 | audit_log_format(ab, "%s%s", | |
520 | need_comma ? "," : "", | |
521 | permission_names[index] | |
522 | ? permission_names[index] : "????"); | |
523 | need_comma = true; | |
524 | } | |
525 | audit_log_end(ab); | |
526 | out: | |
527 | /* release scontext/tcontext */ | |
528 | kfree(tcontext_name); | |
529 | kfree(scontext_name); | |
530 | ||
531 | return; | |
532 | } | |
533 | ||
d9250dea KK |
534 | /* |
535 | * security_boundary_permission - drops violated permissions | |
536 | * on boundary constraint. | |
537 | */ | |
538 | static void type_attribute_bounds_av(struct context *scontext, | |
539 | struct context *tcontext, | |
540 | u16 tclass, | |
d9250dea KK |
541 | struct av_decision *avd) |
542 | { | |
2ae3ba39 KK |
543 | struct context lo_scontext; |
544 | struct context lo_tcontext; | |
545 | struct av_decision lo_avd; | |
23bdecb0 EP |
546 | struct type_datum *source; |
547 | struct type_datum *target; | |
2ae3ba39 | 548 | u32 masked = 0; |
d9250dea | 549 | |
23bdecb0 EP |
550 | source = flex_array_get_ptr(policydb.type_val_to_struct_array, |
551 | scontext->type - 1); | |
552 | BUG_ON(!source); | |
553 | ||
554 | target = flex_array_get_ptr(policydb.type_val_to_struct_array, | |
555 | tcontext->type - 1); | |
556 | BUG_ON(!target); | |
557 | ||
d9250dea KK |
558 | if (source->bounds) { |
559 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
560 | ||
561 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); | |
562 | lo_scontext.type = source->bounds; | |
563 | ||
564 | context_struct_compute_av(&lo_scontext, | |
565 | tcontext, | |
566 | tclass, | |
d9250dea KK |
567 | &lo_avd); |
568 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
569 | return; /* no masked permission */ | |
570 | masked = ~lo_avd.allowed & avd->allowed; | |
2ae3ba39 KK |
571 | } |
572 | ||
573 | if (target->bounds) { | |
574 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
575 | ||
576 | memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); | |
577 | lo_tcontext.type = target->bounds; | |
578 | ||
579 | context_struct_compute_av(scontext, | |
580 | &lo_tcontext, | |
581 | tclass, | |
582 | &lo_avd); | |
583 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
584 | return; /* no masked permission */ | |
585 | masked = ~lo_avd.allowed & avd->allowed; | |
586 | } | |
587 | ||
588 | if (source->bounds && target->bounds) { | |
589 | memset(&lo_avd, 0, sizeof(lo_avd)); | |
590 | /* | |
591 | * lo_scontext and lo_tcontext are already | |
592 | * set up. | |
593 | */ | |
594 | ||
595 | context_struct_compute_av(&lo_scontext, | |
596 | &lo_tcontext, | |
597 | tclass, | |
598 | &lo_avd); | |
599 | if ((lo_avd.allowed & avd->allowed) == avd->allowed) | |
600 | return; /* no masked permission */ | |
601 | masked = ~lo_avd.allowed & avd->allowed; | |
602 | } | |
d9250dea | 603 | |
2ae3ba39 | 604 | if (masked) { |
d9250dea KK |
605 | /* mask violated permissions */ |
606 | avd->allowed &= ~masked; | |
607 | ||
44c2d9bd KK |
608 | /* audit masked permissions */ |
609 | security_dump_masked_av(scontext, tcontext, | |
610 | tclass, masked, "bounds"); | |
d9250dea KK |
611 | } |
612 | } | |
613 | ||
1da177e4 LT |
614 | /* |
615 | * Compute access vectors based on a context structure pair for | |
616 | * the permissions in a particular class. | |
617 | */ | |
19439d05 SS |
618 | static void context_struct_compute_av(struct context *scontext, |
619 | struct context *tcontext, | |
620 | u16 tclass, | |
621 | struct av_decision *avd) | |
1da177e4 LT |
622 | { |
623 | struct constraint_node *constraint; | |
624 | struct role_allow *ra; | |
625 | struct avtab_key avkey; | |
782ebb99 | 626 | struct avtab_node *node; |
1da177e4 | 627 | struct class_datum *tclass_datum; |
782ebb99 SS |
628 | struct ebitmap *sattr, *tattr; |
629 | struct ebitmap_node *snode, *tnode; | |
630 | unsigned int i, j; | |
1da177e4 | 631 | |
1da177e4 | 632 | avd->allowed = 0; |
1da177e4 LT |
633 | avd->auditallow = 0; |
634 | avd->auditdeny = 0xffffffff; | |
1da177e4 | 635 | |
c6d3aaa4 SS |
636 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { |
637 | if (printk_ratelimit()) | |
638 | printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass); | |
19439d05 | 639 | return; |
c6d3aaa4 | 640 | } |
3f12070e EP |
641 | |
642 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
643 | ||
1da177e4 LT |
644 | /* |
645 | * If a specific type enforcement rule was defined for | |
646 | * this permission check, then use it. | |
647 | */ | |
1da177e4 | 648 | avkey.target_class = tclass; |
782ebb99 | 649 | avkey.specified = AVTAB_AV; |
6371dcd3 EP |
650 | sattr = flex_array_get(policydb.type_attr_map_array, scontext->type - 1); |
651 | BUG_ON(!sattr); | |
652 | tattr = flex_array_get(policydb.type_attr_map_array, tcontext->type - 1); | |
653 | BUG_ON(!tattr); | |
9fe79ad1 KK |
654 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
655 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
656 | avkey.source_type = i + 1; |
657 | avkey.target_type = j + 1; | |
658 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
dbc74c65 | 659 | node; |
782ebb99 SS |
660 | node = avtab_search_node_next(node, avkey.specified)) { |
661 | if (node->key.specified == AVTAB_ALLOWED) | |
662 | avd->allowed |= node->datum.data; | |
663 | else if (node->key.specified == AVTAB_AUDITALLOW) | |
664 | avd->auditallow |= node->datum.data; | |
665 | else if (node->key.specified == AVTAB_AUDITDENY) | |
666 | avd->auditdeny &= node->datum.data; | |
667 | } | |
1da177e4 | 668 | |
782ebb99 SS |
669 | /* Check conditional av table for additional permissions */ |
670 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); | |
671 | ||
672 | } | |
673 | } | |
1da177e4 LT |
674 | |
675 | /* | |
676 | * Remove any permissions prohibited by a constraint (this includes | |
677 | * the MLS policy). | |
678 | */ | |
679 | constraint = tclass_datum->constraints; | |
680 | while (constraint) { | |
681 | if ((constraint->permissions & (avd->allowed)) && | |
682 | !constraint_expr_eval(scontext, tcontext, NULL, | |
683 | constraint->expr)) { | |
caabbdc0 | 684 | avd->allowed &= ~(constraint->permissions); |
1da177e4 LT |
685 | } |
686 | constraint = constraint->next; | |
687 | } | |
688 | ||
689 | /* | |
690 | * If checking process transition permission and the | |
691 | * role is changing, then check the (current_role, new_role) | |
692 | * pair. | |
693 | */ | |
c6d3aaa4 SS |
694 | if (tclass == policydb.process_class && |
695 | (avd->allowed & policydb.process_trans_perms) && | |
1da177e4 LT |
696 | scontext->role != tcontext->role) { |
697 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
698 | if (scontext->role == ra->role && | |
699 | tcontext->role == ra->new_role) | |
700 | break; | |
701 | } | |
702 | if (!ra) | |
c6d3aaa4 | 703 | avd->allowed &= ~policydb.process_trans_perms; |
1da177e4 LT |
704 | } |
705 | ||
d9250dea KK |
706 | /* |
707 | * If the given source and target types have boundary | |
708 | * constraint, lazy checks have to mask any violated | |
709 | * permission and notice it to userspace via audit. | |
710 | */ | |
711 | type_attribute_bounds_av(scontext, tcontext, | |
19439d05 | 712 | tclass, avd); |
1da177e4 LT |
713 | } |
714 | ||
715 | static int security_validtrans_handle_fail(struct context *ocontext, | |
5d55a345 EP |
716 | struct context *ncontext, |
717 | struct context *tcontext, | |
718 | u16 tclass) | |
1da177e4 LT |
719 | { |
720 | char *o = NULL, *n = NULL, *t = NULL; | |
721 | u32 olen, nlen, tlen; | |
722 | ||
4b02b524 | 723 | if (context_struct_to_string(ocontext, &o, &olen)) |
1da177e4 | 724 | goto out; |
4b02b524 | 725 | if (context_struct_to_string(ncontext, &n, &nlen)) |
1da177e4 | 726 | goto out; |
4b02b524 | 727 | if (context_struct_to_string(tcontext, &t, &tlen)) |
1da177e4 | 728 | goto out; |
9ad9ad38 | 729 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
5d55a345 EP |
730 | "security_validate_transition: denied for" |
731 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", | |
ac76c05b | 732 | o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); |
1da177e4 LT |
733 | out: |
734 | kfree(o); | |
735 | kfree(n); | |
736 | kfree(t); | |
737 | ||
738 | if (!selinux_enforcing) | |
739 | return 0; | |
740 | return -EPERM; | |
741 | } | |
742 | ||
743 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
c6d3aaa4 | 744 | u16 orig_tclass) |
1da177e4 LT |
745 | { |
746 | struct context *ocontext; | |
747 | struct context *ncontext; | |
748 | struct context *tcontext; | |
749 | struct class_datum *tclass_datum; | |
750 | struct constraint_node *constraint; | |
c6d3aaa4 | 751 | u16 tclass; |
1da177e4 LT |
752 | int rc = 0; |
753 | ||
754 | if (!ss_initialized) | |
755 | return 0; | |
756 | ||
0804d113 | 757 | read_lock(&policy_rwlock); |
1da177e4 | 758 | |
c6d3aaa4 SS |
759 | tclass = unmap_class(orig_tclass); |
760 | ||
1da177e4 | 761 | if (!tclass || tclass > policydb.p_classes.nprim) { |
744ba35e EP |
762 | printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", |
763 | __func__, tclass); | |
1da177e4 LT |
764 | rc = -EINVAL; |
765 | goto out; | |
766 | } | |
767 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
768 | ||
769 | ocontext = sidtab_search(&sidtab, oldsid); | |
770 | if (!ocontext) { | |
744ba35e EP |
771 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
772 | __func__, oldsid); | |
1da177e4 LT |
773 | rc = -EINVAL; |
774 | goto out; | |
775 | } | |
776 | ||
777 | ncontext = sidtab_search(&sidtab, newsid); | |
778 | if (!ncontext) { | |
744ba35e EP |
779 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
780 | __func__, newsid); | |
1da177e4 LT |
781 | rc = -EINVAL; |
782 | goto out; | |
783 | } | |
784 | ||
785 | tcontext = sidtab_search(&sidtab, tasksid); | |
786 | if (!tcontext) { | |
744ba35e EP |
787 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
788 | __func__, tasksid); | |
1da177e4 LT |
789 | rc = -EINVAL; |
790 | goto out; | |
791 | } | |
792 | ||
793 | constraint = tclass_datum->validatetrans; | |
794 | while (constraint) { | |
795 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 796 | constraint->expr)) { |
1da177e4 | 797 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
5d55a345 | 798 | tcontext, tclass); |
1da177e4 LT |
799 | goto out; |
800 | } | |
801 | constraint = constraint->next; | |
802 | } | |
803 | ||
804 | out: | |
0804d113 | 805 | read_unlock(&policy_rwlock); |
1da177e4 LT |
806 | return rc; |
807 | } | |
808 | ||
d9250dea KK |
809 | /* |
810 | * security_bounded_transition - check whether the given | |
811 | * transition is directed to bounded, or not. | |
812 | * It returns 0, if @newsid is bounded by @oldsid. | |
813 | * Otherwise, it returns error code. | |
814 | * | |
815 | * @oldsid : current security identifier | |
816 | * @newsid : destinated security identifier | |
817 | */ | |
818 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
819 | { | |
820 | struct context *old_context, *new_context; | |
821 | struct type_datum *type; | |
822 | int index; | |
4b02b524 | 823 | int rc; |
d9250dea KK |
824 | |
825 | read_lock(&policy_rwlock); | |
826 | ||
4b02b524 | 827 | rc = -EINVAL; |
d9250dea KK |
828 | old_context = sidtab_search(&sidtab, old_sid); |
829 | if (!old_context) { | |
830 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
831 | __func__, old_sid); | |
832 | goto out; | |
833 | } | |
834 | ||
4b02b524 | 835 | rc = -EINVAL; |
d9250dea KK |
836 | new_context = sidtab_search(&sidtab, new_sid); |
837 | if (!new_context) { | |
838 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
839 | __func__, new_sid); | |
840 | goto out; | |
841 | } | |
842 | ||
4b02b524 | 843 | rc = 0; |
af901ca1 | 844 | /* type/domain unchanged */ |
4b02b524 | 845 | if (old_context->type == new_context->type) |
d9250dea | 846 | goto out; |
d9250dea KK |
847 | |
848 | index = new_context->type; | |
849 | while (true) { | |
23bdecb0 EP |
850 | type = flex_array_get_ptr(policydb.type_val_to_struct_array, |
851 | index - 1); | |
d9250dea KK |
852 | BUG_ON(!type); |
853 | ||
854 | /* not bounded anymore */ | |
4b02b524 EP |
855 | rc = -EPERM; |
856 | if (!type->bounds) | |
d9250dea | 857 | break; |
d9250dea KK |
858 | |
859 | /* @newsid is bounded by @oldsid */ | |
4b02b524 EP |
860 | rc = 0; |
861 | if (type->bounds == old_context->type) | |
d9250dea | 862 | break; |
4b02b524 | 863 | |
d9250dea KK |
864 | index = type->bounds; |
865 | } | |
44c2d9bd KK |
866 | |
867 | if (rc) { | |
868 | char *old_name = NULL; | |
869 | char *new_name = NULL; | |
2da5d31b | 870 | u32 length; |
44c2d9bd KK |
871 | |
872 | if (!context_struct_to_string(old_context, | |
873 | &old_name, &length) && | |
874 | !context_struct_to_string(new_context, | |
875 | &new_name, &length)) { | |
876 | audit_log(current->audit_context, | |
877 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
878 | "op=security_bounded_transition " | |
879 | "result=denied " | |
880 | "oldcontext=%s newcontext=%s", | |
881 | old_name, new_name); | |
882 | } | |
883 | kfree(new_name); | |
884 | kfree(old_name); | |
885 | } | |
d9250dea KK |
886 | out: |
887 | read_unlock(&policy_rwlock); | |
888 | ||
889 | return rc; | |
890 | } | |
891 | ||
19439d05 | 892 | static void avd_init(struct av_decision *avd) |
c6d3aaa4 | 893 | { |
19439d05 SS |
894 | avd->allowed = 0; |
895 | avd->auditallow = 0; | |
896 | avd->auditdeny = 0xffffffff; | |
897 | avd->seqno = latest_granting; | |
898 | avd->flags = 0; | |
c6d3aaa4 SS |
899 | } |
900 | ||
19439d05 | 901 | |
1da177e4 LT |
902 | /** |
903 | * security_compute_av - Compute access vector decisions. | |
904 | * @ssid: source security identifier | |
905 | * @tsid: target security identifier | |
906 | * @tclass: target security class | |
1da177e4 LT |
907 | * @avd: access vector decisions |
908 | * | |
909 | * Compute a set of access vector decisions based on the | |
910 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
1da177e4 | 911 | */ |
19439d05 SS |
912 | void security_compute_av(u32 ssid, |
913 | u32 tsid, | |
914 | u16 orig_tclass, | |
915 | struct av_decision *avd) | |
1da177e4 | 916 | { |
c6d3aaa4 | 917 | u16 tclass; |
19439d05 | 918 | struct context *scontext = NULL, *tcontext = NULL; |
c6d3aaa4 | 919 | |
b7f3008a | 920 | read_lock(&policy_rwlock); |
19439d05 | 921 | avd_init(avd); |
c6d3aaa4 SS |
922 | if (!ss_initialized) |
923 | goto allow; | |
924 | ||
19439d05 SS |
925 | scontext = sidtab_search(&sidtab, ssid); |
926 | if (!scontext) { | |
927 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
928 | __func__, ssid); | |
929 | goto out; | |
930 | } | |
931 | ||
932 | /* permissive domain? */ | |
933 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
934 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
935 | ||
936 | tcontext = sidtab_search(&sidtab, tsid); | |
937 | if (!tcontext) { | |
938 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
939 | __func__, tsid); | |
940 | goto out; | |
941 | } | |
942 | ||
c6d3aaa4 SS |
943 | tclass = unmap_class(orig_tclass); |
944 | if (unlikely(orig_tclass && !tclass)) { | |
945 | if (policydb.allow_unknown) | |
946 | goto allow; | |
b7f3008a | 947 | goto out; |
c6d3aaa4 | 948 | } |
19439d05 | 949 | context_struct_compute_av(scontext, tcontext, tclass, avd); |
c6d3aaa4 | 950 | map_decision(orig_tclass, avd, policydb.allow_unknown); |
b7f3008a | 951 | out: |
c6d3aaa4 | 952 | read_unlock(&policy_rwlock); |
19439d05 | 953 | return; |
c6d3aaa4 SS |
954 | allow: |
955 | avd->allowed = 0xffffffff; | |
b7f3008a | 956 | goto out; |
c6d3aaa4 SS |
957 | } |
958 | ||
19439d05 SS |
959 | void security_compute_av_user(u32 ssid, |
960 | u32 tsid, | |
961 | u16 tclass, | |
962 | struct av_decision *avd) | |
c6d3aaa4 | 963 | { |
19439d05 | 964 | struct context *scontext = NULL, *tcontext = NULL; |
1da177e4 | 965 | |
19439d05 SS |
966 | read_lock(&policy_rwlock); |
967 | avd_init(avd); | |
968 | if (!ss_initialized) | |
969 | goto allow; | |
970 | ||
971 | scontext = sidtab_search(&sidtab, ssid); | |
972 | if (!scontext) { | |
973 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
974 | __func__, ssid); | |
975 | goto out; | |
1da177e4 LT |
976 | } |
977 | ||
19439d05 SS |
978 | /* permissive domain? */ |
979 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
980 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
981 | ||
982 | tcontext = sidtab_search(&sidtab, tsid); | |
983 | if (!tcontext) { | |
984 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
985 | __func__, tsid); | |
986 | goto out; | |
987 | } | |
988 | ||
989 | if (unlikely(!tclass)) { | |
990 | if (policydb.allow_unknown) | |
991 | goto allow; | |
992 | goto out; | |
993 | } | |
994 | ||
995 | context_struct_compute_av(scontext, tcontext, tclass, avd); | |
996 | out: | |
0804d113 | 997 | read_unlock(&policy_rwlock); |
19439d05 SS |
998 | return; |
999 | allow: | |
1000 | avd->allowed = 0xffffffff; | |
1001 | goto out; | |
1da177e4 LT |
1002 | } |
1003 | ||
1004 | /* | |
1005 | * Write the security context string representation of | |
1006 | * the context structure `context' into a dynamically | |
1007 | * allocated string of the correct size. Set `*scontext' | |
1008 | * to point to this string and set `*scontext_len' to | |
1009 | * the length of the string. | |
1010 | */ | |
1011 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
1012 | { | |
1013 | char *scontextp; | |
1014 | ||
d5630b9d EP |
1015 | if (scontext) |
1016 | *scontext = NULL; | |
1da177e4 LT |
1017 | *scontext_len = 0; |
1018 | ||
12b29f34 SS |
1019 | if (context->len) { |
1020 | *scontext_len = context->len; | |
bb7081ab EP |
1021 | if (scontext) { |
1022 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
1023 | if (!(*scontext)) | |
1024 | return -ENOMEM; | |
1025 | } | |
12b29f34 SS |
1026 | return 0; |
1027 | } | |
1028 | ||
1da177e4 | 1029 | /* Compute the size of the context. */ |
ac76c05b EP |
1030 | *scontext_len += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + 1; |
1031 | *scontext_len += strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + 1; | |
1032 | *scontext_len += strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)) + 1; | |
1da177e4 LT |
1033 | *scontext_len += mls_compute_context_len(context); |
1034 | ||
d5630b9d EP |
1035 | if (!scontext) |
1036 | return 0; | |
1037 | ||
1da177e4 LT |
1038 | /* Allocate space for the context; caller must free this space. */ |
1039 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 1040 | if (!scontextp) |
1da177e4 | 1041 | return -ENOMEM; |
1da177e4 LT |
1042 | *scontext = scontextp; |
1043 | ||
1044 | /* | |
1045 | * Copy the user name, role name and type name into the context. | |
1046 | */ | |
1047 | sprintf(scontextp, "%s:%s:%s", | |
ac76c05b EP |
1048 | sym_name(&policydb, SYM_USERS, context->user - 1), |
1049 | sym_name(&policydb, SYM_ROLES, context->role - 1), | |
1050 | sym_name(&policydb, SYM_TYPES, context->type - 1)); | |
1051 | scontextp += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + | |
1052 | 1 + strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + | |
1053 | 1 + strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)); | |
1da177e4 LT |
1054 | |
1055 | mls_sid_to_context(context, &scontextp); | |
1056 | ||
1057 | *scontextp = 0; | |
1058 | ||
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | #include "initial_sid_to_string.h" | |
1063 | ||
f0ee2e46 JC |
1064 | const char *security_get_initial_sid_context(u32 sid) |
1065 | { | |
1066 | if (unlikely(sid > SECINITSID_NUM)) | |
1067 | return NULL; | |
1068 | return initial_sid_to_string[sid]; | |
1069 | } | |
1070 | ||
12b29f34 SS |
1071 | static int security_sid_to_context_core(u32 sid, char **scontext, |
1072 | u32 *scontext_len, int force) | |
1da177e4 LT |
1073 | { |
1074 | struct context *context; | |
1075 | int rc = 0; | |
1076 | ||
d5630b9d EP |
1077 | if (scontext) |
1078 | *scontext = NULL; | |
4f4acf3a SS |
1079 | *scontext_len = 0; |
1080 | ||
1da177e4 LT |
1081 | if (!ss_initialized) { |
1082 | if (sid <= SECINITSID_NUM) { | |
1083 | char *scontextp; | |
1084 | ||
1085 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
d5630b9d EP |
1086 | if (!scontext) |
1087 | goto out; | |
5d55a345 | 1088 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
0cccca06 SH |
1089 | if (!scontextp) { |
1090 | rc = -ENOMEM; | |
1091 | goto out; | |
1092 | } | |
1da177e4 LT |
1093 | strcpy(scontextp, initial_sid_to_string[sid]); |
1094 | *scontext = scontextp; | |
1095 | goto out; | |
1096 | } | |
744ba35e EP |
1097 | printk(KERN_ERR "SELinux: %s: called before initial " |
1098 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
1099 | rc = -EINVAL; |
1100 | goto out; | |
1101 | } | |
0804d113 | 1102 | read_lock(&policy_rwlock); |
12b29f34 SS |
1103 | if (force) |
1104 | context = sidtab_search_force(&sidtab, sid); | |
1105 | else | |
1106 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 1107 | if (!context) { |
744ba35e EP |
1108 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1109 | __func__, sid); | |
1da177e4 LT |
1110 | rc = -EINVAL; |
1111 | goto out_unlock; | |
1112 | } | |
1113 | rc = context_struct_to_string(context, scontext, scontext_len); | |
1114 | out_unlock: | |
0804d113 | 1115 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1116 | out: |
1117 | return rc; | |
1118 | ||
1119 | } | |
1120 | ||
12b29f34 SS |
1121 | /** |
1122 | * security_sid_to_context - Obtain a context for a given SID. | |
1123 | * @sid: security identifier, SID | |
1124 | * @scontext: security context | |
1125 | * @scontext_len: length in bytes | |
1126 | * | |
1127 | * Write the string representation of the context associated with @sid | |
1128 | * into a dynamically allocated string of the correct size. Set @scontext | |
1129 | * to point to this string and set @scontext_len to the length of the string. | |
1130 | */ | |
1131 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 1132 | { |
12b29f34 SS |
1133 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
1134 | } | |
1135 | ||
1136 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
1137 | { | |
1138 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
1139 | } | |
1140 | ||
9a59daa0 SS |
1141 | /* |
1142 | * Caveat: Mutates scontext. | |
1143 | */ | |
12b29f34 SS |
1144 | static int string_to_context_struct(struct policydb *pol, |
1145 | struct sidtab *sidtabp, | |
9a59daa0 | 1146 | char *scontext, |
12b29f34 SS |
1147 | u32 scontext_len, |
1148 | struct context *ctx, | |
9a59daa0 | 1149 | u32 def_sid) |
12b29f34 | 1150 | { |
1da177e4 LT |
1151 | struct role_datum *role; |
1152 | struct type_datum *typdatum; | |
1153 | struct user_datum *usrdatum; | |
1154 | char *scontextp, *p, oldc; | |
1155 | int rc = 0; | |
1156 | ||
12b29f34 | 1157 | context_init(ctx); |
1da177e4 | 1158 | |
1da177e4 LT |
1159 | /* Parse the security context. */ |
1160 | ||
1161 | rc = -EINVAL; | |
9a59daa0 | 1162 | scontextp = (char *) scontext; |
1da177e4 LT |
1163 | |
1164 | /* Extract the user. */ | |
1165 | p = scontextp; | |
1166 | while (*p && *p != ':') | |
1167 | p++; | |
1168 | ||
1169 | if (*p == 0) | |
12b29f34 | 1170 | goto out; |
1da177e4 LT |
1171 | |
1172 | *p++ = 0; | |
1173 | ||
12b29f34 | 1174 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1175 | if (!usrdatum) |
12b29f34 | 1176 | goto out; |
1da177e4 | 1177 | |
12b29f34 | 1178 | ctx->user = usrdatum->value; |
1da177e4 LT |
1179 | |
1180 | /* Extract role. */ | |
1181 | scontextp = p; | |
1182 | while (*p && *p != ':') | |
1183 | p++; | |
1184 | ||
1185 | if (*p == 0) | |
12b29f34 | 1186 | goto out; |
1da177e4 LT |
1187 | |
1188 | *p++ = 0; | |
1189 | ||
12b29f34 | 1190 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1191 | if (!role) |
12b29f34 SS |
1192 | goto out; |
1193 | ctx->role = role->value; | |
1da177e4 LT |
1194 | |
1195 | /* Extract type. */ | |
1196 | scontextp = p; | |
1197 | while (*p && *p != ':') | |
1198 | p++; | |
1199 | oldc = *p; | |
1200 | *p++ = 0; | |
1201 | ||
12b29f34 | 1202 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1203 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1204 | goto out; |
1da177e4 | 1205 | |
12b29f34 | 1206 | ctx->type = typdatum->value; |
1da177e4 | 1207 | |
12b29f34 | 1208 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 1209 | if (rc) |
12b29f34 | 1210 | goto out; |
1da177e4 | 1211 | |
4b02b524 EP |
1212 | rc = -EINVAL; |
1213 | if ((p - scontext) < scontext_len) | |
12b29f34 | 1214 | goto out; |
1da177e4 LT |
1215 | |
1216 | /* Check the validity of the new context. */ | |
4b02b524 | 1217 | if (!policydb_context_isvalid(pol, ctx)) |
12b29f34 | 1218 | goto out; |
12b29f34 SS |
1219 | rc = 0; |
1220 | out: | |
8e531af9 EP |
1221 | if (rc) |
1222 | context_destroy(ctx); | |
12b29f34 SS |
1223 | return rc; |
1224 | } | |
1225 | ||
1226 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
1227 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
1228 | int force) | |
1229 | { | |
9a59daa0 | 1230 | char *scontext2, *str = NULL; |
12b29f34 SS |
1231 | struct context context; |
1232 | int rc = 0; | |
1233 | ||
1234 | if (!ss_initialized) { | |
1235 | int i; | |
1236 | ||
1237 | for (i = 1; i < SECINITSID_NUM; i++) { | |
1238 | if (!strcmp(initial_sid_to_string[i], scontext)) { | |
1239 | *sid = i; | |
9a59daa0 | 1240 | return 0; |
12b29f34 SS |
1241 | } |
1242 | } | |
1243 | *sid = SECINITSID_KERNEL; | |
9a59daa0 | 1244 | return 0; |
12b29f34 SS |
1245 | } |
1246 | *sid = SECSID_NULL; | |
1247 | ||
9a59daa0 | 1248 | /* Copy the string so that we can modify the copy as we parse it. */ |
c1a7368a | 1249 | scontext2 = kmalloc(scontext_len + 1, gfp_flags); |
9a59daa0 SS |
1250 | if (!scontext2) |
1251 | return -ENOMEM; | |
1252 | memcpy(scontext2, scontext, scontext_len); | |
1253 | scontext2[scontext_len] = 0; | |
1254 | ||
1255 | if (force) { | |
1256 | /* Save another copy for storing in uninterpreted form */ | |
4b02b524 | 1257 | rc = -ENOMEM; |
9a59daa0 | 1258 | str = kstrdup(scontext2, gfp_flags); |
4b02b524 EP |
1259 | if (!str) |
1260 | goto out; | |
9a59daa0 SS |
1261 | } |
1262 | ||
0804d113 | 1263 | read_lock(&policy_rwlock); |
4b02b524 EP |
1264 | rc = string_to_context_struct(&policydb, &sidtab, scontext2, |
1265 | scontext_len, &context, def_sid); | |
12b29f34 | 1266 | if (rc == -EINVAL && force) { |
9a59daa0 | 1267 | context.str = str; |
12b29f34 | 1268 | context.len = scontext_len; |
9a59daa0 | 1269 | str = NULL; |
12b29f34 | 1270 | } else if (rc) |
4b02b524 | 1271 | goto out_unlock; |
12b29f34 | 1272 | rc = sidtab_context_to_sid(&sidtab, &context, sid); |
8e531af9 | 1273 | context_destroy(&context); |
4b02b524 | 1274 | out_unlock: |
0804d113 | 1275 | read_unlock(&policy_rwlock); |
4b02b524 | 1276 | out: |
9a59daa0 SS |
1277 | kfree(scontext2); |
1278 | kfree(str); | |
1da177e4 LT |
1279 | return rc; |
1280 | } | |
1281 | ||
f5c1d5b2 JM |
1282 | /** |
1283 | * security_context_to_sid - Obtain a SID for a given security context. | |
1284 | * @scontext: security context | |
1285 | * @scontext_len: length in bytes | |
1286 | * @sid: security identifier, SID | |
1287 | * | |
1288 | * Obtains a SID associated with the security context that | |
1289 | * has the string representation specified by @scontext. | |
1290 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1291 | * memory is available, or 0 on success. | |
1292 | */ | |
8f0cfa52 | 1293 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid) |
f5c1d5b2 JM |
1294 | { |
1295 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 | 1296 | sid, SECSID_NULL, GFP_KERNEL, 0); |
f5c1d5b2 JM |
1297 | } |
1298 | ||
1299 | /** | |
1300 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1301 | * falling back to specified default if needed. | |
1302 | * | |
1303 | * @scontext: security context | |
1304 | * @scontext_len: length in bytes | |
1305 | * @sid: security identifier, SID | |
d133a960 | 1306 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1307 | * |
1308 | * Obtains a SID associated with the security context that | |
1309 | * has the string representation specified by @scontext. | |
1310 | * The default SID is passed to the MLS layer to be used to allow | |
1311 | * kernel labeling of the MLS field if the MLS field is not present | |
1312 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1313 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1314 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1315 | * memory is available, or 0 on success. | |
1316 | */ | |
7bf570dc DH |
1317 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1318 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1319 | { |
1320 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1321 | sid, def_sid, gfp_flags, 1); |
1322 | } | |
1323 | ||
1324 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1325 | u32 *sid) | |
1326 | { | |
1327 | return security_context_to_sid_core(scontext, scontext_len, | |
1328 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1329 | } |
1330 | ||
1da177e4 LT |
1331 | static int compute_sid_handle_invalid_context( |
1332 | struct context *scontext, | |
1333 | struct context *tcontext, | |
1334 | u16 tclass, | |
1335 | struct context *newcontext) | |
1336 | { | |
1337 | char *s = NULL, *t = NULL, *n = NULL; | |
1338 | u32 slen, tlen, nlen; | |
1339 | ||
4b02b524 | 1340 | if (context_struct_to_string(scontext, &s, &slen)) |
1da177e4 | 1341 | goto out; |
4b02b524 | 1342 | if (context_struct_to_string(tcontext, &t, &tlen)) |
1da177e4 | 1343 | goto out; |
4b02b524 | 1344 | if (context_struct_to_string(newcontext, &n, &nlen)) |
1da177e4 | 1345 | goto out; |
9ad9ad38 | 1346 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
1da177e4 LT |
1347 | "security_compute_sid: invalid context %s" |
1348 | " for scontext=%s" | |
1349 | " tcontext=%s" | |
1350 | " tclass=%s", | |
ac76c05b | 1351 | n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); |
1da177e4 LT |
1352 | out: |
1353 | kfree(s); | |
1354 | kfree(t); | |
1355 | kfree(n); | |
1356 | if (!selinux_enforcing) | |
1357 | return 0; | |
1358 | return -EACCES; | |
1359 | } | |
1360 | ||
652bb9b0 | 1361 | static void filename_compute_type(struct policydb *p, struct context *newcontext, |
2667991f | 1362 | u32 stype, u32 ttype, u16 tclass, |
f50a3ec9 | 1363 | const char *objname) |
652bb9b0 | 1364 | { |
2463c26d EP |
1365 | struct filename_trans ft; |
1366 | struct filename_trans_datum *otype; | |
03a4c018 EP |
1367 | |
1368 | /* | |
1369 | * Most filename trans rules are going to live in specific directories | |
1370 | * like /dev or /var/run. This bitmap will quickly skip rule searches | |
1371 | * if the ttype does not contain any rules. | |
1372 | */ | |
1373 | if (!ebitmap_get_bit(&p->filename_trans_ttypes, ttype)) | |
1374 | return; | |
1375 | ||
2463c26d EP |
1376 | ft.stype = stype; |
1377 | ft.ttype = ttype; | |
1378 | ft.tclass = tclass; | |
1379 | ft.name = objname; | |
1380 | ||
1381 | otype = hashtab_search(p->filename_trans, &ft); | |
1382 | if (otype) | |
1383 | newcontext->type = otype->otype; | |
652bb9b0 EP |
1384 | } |
1385 | ||
1da177e4 LT |
1386 | static int security_compute_sid(u32 ssid, |
1387 | u32 tsid, | |
c6d3aaa4 | 1388 | u16 orig_tclass, |
1da177e4 | 1389 | u32 specified, |
f50a3ec9 | 1390 | const char *objname, |
c6d3aaa4 SS |
1391 | u32 *out_sid, |
1392 | bool kern) | |
1da177e4 | 1393 | { |
aa893269 | 1394 | struct class_datum *cladatum = NULL; |
1da177e4 LT |
1395 | struct context *scontext = NULL, *tcontext = NULL, newcontext; |
1396 | struct role_trans *roletr = NULL; | |
1397 | struct avtab_key avkey; | |
1398 | struct avtab_datum *avdatum; | |
1399 | struct avtab_node *node; | |
c6d3aaa4 | 1400 | u16 tclass; |
1da177e4 | 1401 | int rc = 0; |
6f5317e7 | 1402 | bool sock; |
1da177e4 LT |
1403 | |
1404 | if (!ss_initialized) { | |
c6d3aaa4 SS |
1405 | switch (orig_tclass) { |
1406 | case SECCLASS_PROCESS: /* kernel value */ | |
1da177e4 LT |
1407 | *out_sid = ssid; |
1408 | break; | |
1409 | default: | |
1410 | *out_sid = tsid; | |
1411 | break; | |
1412 | } | |
1413 | goto out; | |
1414 | } | |
1415 | ||
851f8a69 VY |
1416 | context_init(&newcontext); |
1417 | ||
0804d113 | 1418 | read_lock(&policy_rwlock); |
1da177e4 | 1419 | |
6f5317e7 | 1420 | if (kern) { |
c6d3aaa4 | 1421 | tclass = unmap_class(orig_tclass); |
6f5317e7 HC |
1422 | sock = security_is_socket_class(orig_tclass); |
1423 | } else { | |
c6d3aaa4 | 1424 | tclass = orig_tclass; |
6f5317e7 HC |
1425 | sock = security_is_socket_class(map_class(tclass)); |
1426 | } | |
c6d3aaa4 | 1427 | |
1da177e4 LT |
1428 | scontext = sidtab_search(&sidtab, ssid); |
1429 | if (!scontext) { | |
744ba35e EP |
1430 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1431 | __func__, ssid); | |
1da177e4 LT |
1432 | rc = -EINVAL; |
1433 | goto out_unlock; | |
1434 | } | |
1435 | tcontext = sidtab_search(&sidtab, tsid); | |
1436 | if (!tcontext) { | |
744ba35e EP |
1437 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1438 | __func__, tsid); | |
1da177e4 LT |
1439 | rc = -EINVAL; |
1440 | goto out_unlock; | |
1441 | } | |
1442 | ||
aa893269 EP |
1443 | if (tclass && tclass <= policydb.p_classes.nprim) |
1444 | cladatum = policydb.class_val_to_struct[tclass - 1]; | |
1445 | ||
1da177e4 LT |
1446 | /* Set the user identity. */ |
1447 | switch (specified) { | |
1448 | case AVTAB_TRANSITION: | |
1449 | case AVTAB_CHANGE: | |
aa893269 EP |
1450 | if (cladatum && cladatum->default_user == DEFAULT_TARGET) { |
1451 | newcontext.user = tcontext->user; | |
1452 | } else { | |
1453 | /* notice this gets both DEFAULT_SOURCE and unset */ | |
1454 | /* Use the process user identity. */ | |
1455 | newcontext.user = scontext->user; | |
1456 | } | |
1da177e4 LT |
1457 | break; |
1458 | case AVTAB_MEMBER: | |
1459 | /* Use the related object owner. */ | |
1460 | newcontext.user = tcontext->user; | |
1461 | break; | |
1462 | } | |
1463 | ||
aa893269 EP |
1464 | /* Set the role to default values. */ |
1465 | if (cladatum && cladatum->default_role == DEFAULT_SOURCE) { | |
1da177e4 | 1466 | newcontext.role = scontext->role; |
aa893269 EP |
1467 | } else if (cladatum && cladatum->default_role == DEFAULT_TARGET) { |
1468 | newcontext.role = tcontext->role; | |
1469 | } else { | |
1470 | if ((tclass == policydb.process_class) || (sock == true)) | |
1471 | newcontext.role = scontext->role; | |
1472 | else | |
1473 | newcontext.role = OBJECT_R_VAL; | |
1474 | } | |
1475 | ||
1476 | /* Set the type to default values. */ | |
eed7795d | 1477 | if (cladatum && cladatum->default_type == DEFAULT_SOURCE) { |
1da177e4 | 1478 | newcontext.type = scontext->type; |
eed7795d | 1479 | } else if (cladatum && cladatum->default_type == DEFAULT_TARGET) { |
1da177e4 | 1480 | newcontext.type = tcontext->type; |
eed7795d EP |
1481 | } else { |
1482 | if ((tclass == policydb.process_class) || (sock == true)) { | |
1483 | /* Use the type of process. */ | |
1484 | newcontext.type = scontext->type; | |
1485 | } else { | |
1486 | /* Use the type of the related object. */ | |
1487 | newcontext.type = tcontext->type; | |
1488 | } | |
1da177e4 LT |
1489 | } |
1490 | ||
1491 | /* Look for a type transition/member/change rule. */ | |
1492 | avkey.source_type = scontext->type; | |
1493 | avkey.target_type = tcontext->type; | |
1494 | avkey.target_class = tclass; | |
782ebb99 SS |
1495 | avkey.specified = specified; |
1496 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1497 | |
1498 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1499 | if (!avdatum) { |
782ebb99 | 1500 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1501 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1502 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1503 | avdatum = &node->datum; |
1504 | break; | |
1505 | } | |
1506 | } | |
1507 | } | |
1508 | ||
782ebb99 | 1509 | if (avdatum) { |
1da177e4 | 1510 | /* Use the type from the type transition/member/change rule. */ |
782ebb99 | 1511 | newcontext.type = avdatum->data; |
1da177e4 LT |
1512 | } |
1513 | ||
4742600c | 1514 | /* if we have a objname this is a file trans check so check those rules */ |
f50a3ec9 | 1515 | if (objname) |
652bb9b0 | 1516 | filename_compute_type(&policydb, &newcontext, scontext->type, |
f50a3ec9 | 1517 | tcontext->type, tclass, objname); |
652bb9b0 | 1518 | |
1da177e4 | 1519 | /* Check for class-specific changes. */ |
63a312ca HC |
1520 | if (specified & AVTAB_TRANSITION) { |
1521 | /* Look for a role transition rule. */ | |
1522 | for (roletr = policydb.role_tr; roletr; roletr = roletr->next) { | |
1523 | if ((roletr->role == scontext->role) && | |
1524 | (roletr->type == tcontext->type) && | |
1525 | (roletr->tclass == tclass)) { | |
1526 | /* Use the role transition rule. */ | |
1527 | newcontext.role = roletr->new_role; | |
1528 | break; | |
1da177e4 LT |
1529 | } |
1530 | } | |
1da177e4 LT |
1531 | } |
1532 | ||
1533 | /* Set the MLS attributes. | |
1534 | This is done last because it may allocate memory. */ | |
6f5317e7 HC |
1535 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, |
1536 | &newcontext, sock); | |
1da177e4 LT |
1537 | if (rc) |
1538 | goto out_unlock; | |
1539 | ||
1540 | /* Check the validity of the context. */ | |
1541 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1542 | rc = compute_sid_handle_invalid_context(scontext, | |
1543 | tcontext, | |
1544 | tclass, | |
1545 | &newcontext); | |
1546 | if (rc) | |
1547 | goto out_unlock; | |
1548 | } | |
1549 | /* Obtain the sid for the context. */ | |
1550 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1551 | out_unlock: | |
0804d113 | 1552 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1553 | context_destroy(&newcontext); |
1554 | out: | |
1555 | return rc; | |
1556 | } | |
1557 | ||
1558 | /** | |
1559 | * security_transition_sid - Compute the SID for a new subject/object. | |
1560 | * @ssid: source security identifier | |
1561 | * @tsid: target security identifier | |
1562 | * @tclass: target security class | |
1563 | * @out_sid: security identifier for new subject/object | |
1564 | * | |
1565 | * Compute a SID to use for labeling a new subject or object in the | |
1566 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1567 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1568 | * if insufficient memory is available, or %0 if the new SID was | |
1569 | * computed successfully. | |
1570 | */ | |
652bb9b0 EP |
1571 | int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, |
1572 | const struct qstr *qstr, u32 *out_sid) | |
1da177e4 | 1573 | { |
c6d3aaa4 | 1574 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, |
f50a3ec9 | 1575 | qstr ? qstr->name : NULL, out_sid, true); |
c6d3aaa4 SS |
1576 | } |
1577 | ||
f50a3ec9 KK |
1578 | int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, |
1579 | const char *objname, u32 *out_sid) | |
c6d3aaa4 SS |
1580 | { |
1581 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, | |
f50a3ec9 | 1582 | objname, out_sid, false); |
1da177e4 LT |
1583 | } |
1584 | ||
1585 | /** | |
1586 | * security_member_sid - Compute the SID for member selection. | |
1587 | * @ssid: source security identifier | |
1588 | * @tsid: target security identifier | |
1589 | * @tclass: target security class | |
1590 | * @out_sid: security identifier for selected member | |
1591 | * | |
1592 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1593 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1594 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1595 | * if insufficient memory is available, or %0 if the SID was | |
1596 | * computed successfully. | |
1597 | */ | |
1598 | int security_member_sid(u32 ssid, | |
1599 | u32 tsid, | |
1600 | u16 tclass, | |
1601 | u32 *out_sid) | |
1602 | { | |
652bb9b0 EP |
1603 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, NULL, |
1604 | out_sid, false); | |
1da177e4 LT |
1605 | } |
1606 | ||
1607 | /** | |
1608 | * security_change_sid - Compute the SID for object relabeling. | |
1609 | * @ssid: source security identifier | |
1610 | * @tsid: target security identifier | |
1611 | * @tclass: target security class | |
1612 | * @out_sid: security identifier for selected member | |
1613 | * | |
1614 | * Compute a SID to use for relabeling an object of class @tclass | |
1615 | * based on a SID pair (@ssid, @tsid). | |
1616 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1617 | * if insufficient memory is available, or %0 if the SID was | |
1618 | * computed successfully. | |
1619 | */ | |
1620 | int security_change_sid(u32 ssid, | |
1621 | u32 tsid, | |
1622 | u16 tclass, | |
1623 | u32 *out_sid) | |
1624 | { | |
652bb9b0 EP |
1625 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL, |
1626 | out_sid, false); | |
b94c7e67 CS |
1627 | } |
1628 | ||
1da177e4 LT |
1629 | /* Clone the SID into the new SID table. */ |
1630 | static int clone_sid(u32 sid, | |
1631 | struct context *context, | |
1632 | void *arg) | |
1633 | { | |
1634 | struct sidtab *s = arg; | |
1635 | ||
42596eaf GT |
1636 | if (sid > SECINITSID_NUM) |
1637 | return sidtab_insert(s, sid, context); | |
1638 | else | |
1639 | return 0; | |
1da177e4 LT |
1640 | } |
1641 | ||
1642 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1643 | { | |
4b02b524 EP |
1644 | char *s; |
1645 | u32 len; | |
1da177e4 | 1646 | |
4b02b524 EP |
1647 | if (selinux_enforcing) |
1648 | return -EINVAL; | |
1649 | ||
1650 | if (!context_struct_to_string(context, &s, &len)) { | |
1651 | printk(KERN_WARNING "SELinux: Context %s would be invalid if enforcing\n", s); | |
1652 | kfree(s); | |
1da177e4 | 1653 | } |
4b02b524 | 1654 | return 0; |
1da177e4 LT |
1655 | } |
1656 | ||
1657 | struct convert_context_args { | |
1658 | struct policydb *oldp; | |
1659 | struct policydb *newp; | |
1660 | }; | |
1661 | ||
1662 | /* | |
1663 | * Convert the values in the security context | |
1664 | * structure `c' from the values specified | |
1665 | * in the policy `p->oldp' to the values specified | |
1666 | * in the policy `p->newp'. Verify that the | |
1667 | * context is valid under the new policy. | |
1668 | */ | |
1669 | static int convert_context(u32 key, | |
1670 | struct context *c, | |
1671 | void *p) | |
1672 | { | |
1673 | struct convert_context_args *args; | |
1674 | struct context oldc; | |
0719aaf5 GT |
1675 | struct ocontext *oc; |
1676 | struct mls_range *range; | |
1da177e4 LT |
1677 | struct role_datum *role; |
1678 | struct type_datum *typdatum; | |
1679 | struct user_datum *usrdatum; | |
1680 | char *s; | |
1681 | u32 len; | |
42596eaf GT |
1682 | int rc = 0; |
1683 | ||
1684 | if (key <= SECINITSID_NUM) | |
1685 | goto out; | |
1da177e4 LT |
1686 | |
1687 | args = p; | |
1688 | ||
12b29f34 SS |
1689 | if (c->str) { |
1690 | struct context ctx; | |
4b02b524 EP |
1691 | |
1692 | rc = -ENOMEM; | |
9a59daa0 | 1693 | s = kstrdup(c->str, GFP_KERNEL); |
4b02b524 | 1694 | if (!s) |
9a59daa0 | 1695 | goto out; |
4b02b524 | 1696 | |
9a59daa0 SS |
1697 | rc = string_to_context_struct(args->newp, NULL, s, |
1698 | c->len, &ctx, SECSID_NULL); | |
1699 | kfree(s); | |
12b29f34 | 1700 | if (!rc) { |
4b02b524 | 1701 | printk(KERN_INFO "SELinux: Context %s became valid (mapped).\n", |
12b29f34 SS |
1702 | c->str); |
1703 | /* Replace string with mapped representation. */ | |
1704 | kfree(c->str); | |
1705 | memcpy(c, &ctx, sizeof(*c)); | |
1706 | goto out; | |
1707 | } else if (rc == -EINVAL) { | |
1708 | /* Retain string representation for later mapping. */ | |
1709 | rc = 0; | |
1710 | goto out; | |
1711 | } else { | |
1712 | /* Other error condition, e.g. ENOMEM. */ | |
4b02b524 | 1713 | printk(KERN_ERR "SELinux: Unable to map context %s, rc = %d.\n", |
12b29f34 SS |
1714 | c->str, -rc); |
1715 | goto out; | |
1716 | } | |
1717 | } | |
1718 | ||
1da177e4 LT |
1719 | rc = context_cpy(&oldc, c); |
1720 | if (rc) | |
1721 | goto out; | |
1722 | ||
1da177e4 | 1723 | /* Convert the user. */ |
4b02b524 | 1724 | rc = -EINVAL; |
1da177e4 | 1725 | usrdatum = hashtab_search(args->newp->p_users.table, |
ac76c05b | 1726 | sym_name(args->oldp, SYM_USERS, c->user - 1)); |
5d55a345 | 1727 | if (!usrdatum) |
1da177e4 | 1728 | goto bad; |
1da177e4 LT |
1729 | c->user = usrdatum->value; |
1730 | ||
1731 | /* Convert the role. */ | |
4b02b524 | 1732 | rc = -EINVAL; |
1da177e4 | 1733 | role = hashtab_search(args->newp->p_roles.table, |
ac76c05b | 1734 | sym_name(args->oldp, SYM_ROLES, c->role - 1)); |
5d55a345 | 1735 | if (!role) |
1da177e4 | 1736 | goto bad; |
1da177e4 LT |
1737 | c->role = role->value; |
1738 | ||
1739 | /* Convert the type. */ | |
4b02b524 | 1740 | rc = -EINVAL; |
1da177e4 | 1741 | typdatum = hashtab_search(args->newp->p_types.table, |
ac76c05b | 1742 | sym_name(args->oldp, SYM_TYPES, c->type - 1)); |
5d55a345 | 1743 | if (!typdatum) |
1da177e4 | 1744 | goto bad; |
1da177e4 LT |
1745 | c->type = typdatum->value; |
1746 | ||
0719aaf5 GT |
1747 | /* Convert the MLS fields if dealing with MLS policies */ |
1748 | if (args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1749 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1750 | if (rc) | |
1751 | goto bad; | |
1752 | } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) { | |
1753 | /* | |
1754 | * Switching between MLS and non-MLS policy: | |
1755 | * free any storage used by the MLS fields in the | |
1756 | * context for all existing entries in the sidtab. | |
1757 | */ | |
1758 | mls_context_destroy(c); | |
1759 | } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1760 | /* | |
1761 | * Switching between non-MLS and MLS policy: | |
1762 | * ensure that the MLS fields of the context for all | |
1763 | * existing entries in the sidtab are filled in with a | |
1764 | * suitable default value, likely taken from one of the | |
1765 | * initial SIDs. | |
1766 | */ | |
1767 | oc = args->newp->ocontexts[OCON_ISID]; | |
1768 | while (oc && oc->sid[0] != SECINITSID_UNLABELED) | |
1769 | oc = oc->next; | |
4b02b524 | 1770 | rc = -EINVAL; |
0719aaf5 GT |
1771 | if (!oc) { |
1772 | printk(KERN_ERR "SELinux: unable to look up" | |
1773 | " the initial SIDs list\n"); | |
1774 | goto bad; | |
1775 | } | |
1776 | range = &oc->context[0].range; | |
1777 | rc = mls_range_set(c, range); | |
1778 | if (rc) | |
1779 | goto bad; | |
1780 | } | |
1da177e4 LT |
1781 | |
1782 | /* Check the validity of the new context. */ | |
1783 | if (!policydb_context_isvalid(args->newp, c)) { | |
1784 | rc = convert_context_handle_invalid_context(&oldc); | |
1785 | if (rc) | |
1786 | goto bad; | |
1787 | } | |
1788 | ||
1789 | context_destroy(&oldc); | |
4b02b524 | 1790 | |
12b29f34 | 1791 | rc = 0; |
1da177e4 LT |
1792 | out: |
1793 | return rc; | |
1794 | bad: | |
12b29f34 | 1795 | /* Map old representation to string and save it. */ |
4b02b524 EP |
1796 | rc = context_struct_to_string(&oldc, &s, &len); |
1797 | if (rc) | |
1798 | return rc; | |
1da177e4 | 1799 | context_destroy(&oldc); |
12b29f34 SS |
1800 | context_destroy(c); |
1801 | c->str = s; | |
1802 | c->len = len; | |
4b02b524 | 1803 | printk(KERN_INFO "SELinux: Context %s became invalid (unmapped).\n", |
12b29f34 SS |
1804 | c->str); |
1805 | rc = 0; | |
1da177e4 LT |
1806 | goto out; |
1807 | } | |
1808 | ||
3bb56b25 PM |
1809 | static void security_load_policycaps(void) |
1810 | { | |
1811 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, | |
1812 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
1813 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
1814 | POLICYDB_CAPABILITY_OPENPERM); | |
3bb56b25 PM |
1815 | } |
1816 | ||
e900a7d9 | 1817 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
1818 | |
1819 | /** | |
1820 | * security_load_policy - Load a security policy configuration. | |
1821 | * @data: binary policy data | |
1822 | * @len: length of data in bytes | |
1823 | * | |
1824 | * Load a new set of security policy configuration data, | |
1825 | * validate it and convert the SID table as necessary. | |
1826 | * This function will flush the access vector cache after | |
1827 | * loading the new policy. | |
1828 | */ | |
1829 | int security_load_policy(void *data, size_t len) | |
1830 | { | |
1831 | struct policydb oldpolicydb, newpolicydb; | |
1832 | struct sidtab oldsidtab, newsidtab; | |
c6d3aaa4 | 1833 | struct selinux_mapping *oldmap, *map = NULL; |
1da177e4 LT |
1834 | struct convert_context_args args; |
1835 | u32 seqno; | |
c6d3aaa4 | 1836 | u16 map_size; |
1da177e4 LT |
1837 | int rc = 0; |
1838 | struct policy_file file = { data, len }, *fp = &file; | |
1839 | ||
1da177e4 LT |
1840 | if (!ss_initialized) { |
1841 | avtab_cache_init(); | |
a2000050 EP |
1842 | rc = policydb_read(&policydb, fp); |
1843 | if (rc) { | |
1da177e4 | 1844 | avtab_cache_destroy(); |
a2000050 | 1845 | return rc; |
1da177e4 | 1846 | } |
a2000050 | 1847 | |
cee74f47 | 1848 | policydb.len = len; |
a2000050 EP |
1849 | rc = selinux_set_mapping(&policydb, secclass_map, |
1850 | ¤t_mapping, | |
1851 | ¤t_mapping_size); | |
1852 | if (rc) { | |
1da177e4 LT |
1853 | policydb_destroy(&policydb); |
1854 | avtab_cache_destroy(); | |
a2000050 | 1855 | return rc; |
1da177e4 | 1856 | } |
a2000050 EP |
1857 | |
1858 | rc = policydb_load_isids(&policydb, &sidtab); | |
1859 | if (rc) { | |
b94c7e67 CS |
1860 | policydb_destroy(&policydb); |
1861 | avtab_cache_destroy(); | |
a2000050 | 1862 | return rc; |
b94c7e67 | 1863 | } |
a2000050 | 1864 | |
3bb56b25 | 1865 | security_load_policycaps(); |
1da177e4 | 1866 | ss_initialized = 1; |
4c443d1b | 1867 | seqno = ++latest_granting; |
1da177e4 | 1868 | selinux_complete_init(); |
4c443d1b SS |
1869 | avc_ss_reset(seqno); |
1870 | selnl_notify_policyload(seqno); | |
11904167 | 1871 | selinux_status_update_policyload(seqno); |
7420ed23 | 1872 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1873 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1874 | return 0; |
1875 | } | |
1876 | ||
1877 | #if 0 | |
1878 | sidtab_hash_eval(&sidtab, "sids"); | |
1879 | #endif | |
1880 | ||
a2000050 EP |
1881 | rc = policydb_read(&newpolicydb, fp); |
1882 | if (rc) | |
1883 | return rc; | |
1da177e4 | 1884 | |
cee74f47 | 1885 | newpolicydb.len = len; |
0719aaf5 GT |
1886 | /* If switching between different policy types, log MLS status */ |
1887 | if (policydb.mls_enabled && !newpolicydb.mls_enabled) | |
1888 | printk(KERN_INFO "SELinux: Disabling MLS support...\n"); | |
1889 | else if (!policydb.mls_enabled && newpolicydb.mls_enabled) | |
1890 | printk(KERN_INFO "SELinux: Enabling MLS support...\n"); | |
1891 | ||
42596eaf GT |
1892 | rc = policydb_load_isids(&newpolicydb, &newsidtab); |
1893 | if (rc) { | |
1894 | printk(KERN_ERR "SELinux: unable to load the initial SIDs\n"); | |
12b29f34 | 1895 | policydb_destroy(&newpolicydb); |
42596eaf | 1896 | return rc; |
12b29f34 | 1897 | } |
1da177e4 | 1898 | |
a2000050 EP |
1899 | rc = selinux_set_mapping(&newpolicydb, secclass_map, &map, &map_size); |
1900 | if (rc) | |
b94c7e67 | 1901 | goto err; |
b94c7e67 | 1902 | |
e900a7d9 SS |
1903 | rc = security_preserve_bools(&newpolicydb); |
1904 | if (rc) { | |
454d972c | 1905 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
1906 | goto err; |
1907 | } | |
1908 | ||
1da177e4 LT |
1909 | /* Clone the SID table. */ |
1910 | sidtab_shutdown(&sidtab); | |
a2000050 EP |
1911 | |
1912 | rc = sidtab_map(&sidtab, clone_sid, &newsidtab); | |
1913 | if (rc) | |
1da177e4 | 1914 | goto err; |
1da177e4 | 1915 | |
12b29f34 SS |
1916 | /* |
1917 | * Convert the internal representations of contexts | |
1918 | * in the new SID table. | |
1919 | */ | |
1da177e4 LT |
1920 | args.oldp = &policydb; |
1921 | args.newp = &newpolicydb; | |
12b29f34 | 1922 | rc = sidtab_map(&newsidtab, convert_context, &args); |
0719aaf5 GT |
1923 | if (rc) { |
1924 | printk(KERN_ERR "SELinux: unable to convert the internal" | |
1925 | " representation of contexts in the new SID" | |
1926 | " table\n"); | |
12b29f34 | 1927 | goto err; |
0719aaf5 | 1928 | } |
1da177e4 LT |
1929 | |
1930 | /* Save the old policydb and SID table to free later. */ | |
1931 | memcpy(&oldpolicydb, &policydb, sizeof policydb); | |
1932 | sidtab_set(&oldsidtab, &sidtab); | |
1933 | ||
1934 | /* Install the new policydb and SID table. */ | |
0804d113 | 1935 | write_lock_irq(&policy_rwlock); |
1da177e4 LT |
1936 | memcpy(&policydb, &newpolicydb, sizeof policydb); |
1937 | sidtab_set(&sidtab, &newsidtab); | |
3bb56b25 | 1938 | security_load_policycaps(); |
c6d3aaa4 SS |
1939 | oldmap = current_mapping; |
1940 | current_mapping = map; | |
1941 | current_mapping_size = map_size; | |
1da177e4 | 1942 | seqno = ++latest_granting; |
0804d113 | 1943 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
1944 | |
1945 | /* Free the old policydb and SID table. */ | |
1946 | policydb_destroy(&oldpolicydb); | |
1947 | sidtab_destroy(&oldsidtab); | |
c6d3aaa4 | 1948 | kfree(oldmap); |
1da177e4 LT |
1949 | |
1950 | avc_ss_reset(seqno); | |
1951 | selnl_notify_policyload(seqno); | |
11904167 | 1952 | selinux_status_update_policyload(seqno); |
7420ed23 | 1953 | selinux_netlbl_cache_invalidate(); |
342a0cff | 1954 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
1955 | |
1956 | return 0; | |
1957 | ||
1958 | err: | |
c6d3aaa4 | 1959 | kfree(map); |
1da177e4 LT |
1960 | sidtab_destroy(&newsidtab); |
1961 | policydb_destroy(&newpolicydb); | |
1962 | return rc; | |
1963 | ||
1964 | } | |
1965 | ||
cee74f47 EP |
1966 | size_t security_policydb_len(void) |
1967 | { | |
1968 | size_t len; | |
1969 | ||
1970 | read_lock(&policy_rwlock); | |
1971 | len = policydb.len; | |
1972 | read_unlock(&policy_rwlock); | |
1973 | ||
1974 | return len; | |
1975 | } | |
1976 | ||
1da177e4 LT |
1977 | /** |
1978 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
1979 | * @protocol: protocol number |
1980 | * @port: port number | |
1981 | * @out_sid: security identifier | |
1982 | */ | |
3e112172 | 1983 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
1984 | { |
1985 | struct ocontext *c; | |
1986 | int rc = 0; | |
1987 | ||
0804d113 | 1988 | read_lock(&policy_rwlock); |
1da177e4 LT |
1989 | |
1990 | c = policydb.ocontexts[OCON_PORT]; | |
1991 | while (c) { | |
1992 | if (c->u.port.protocol == protocol && | |
1993 | c->u.port.low_port <= port && | |
1994 | c->u.port.high_port >= port) | |
1995 | break; | |
1996 | c = c->next; | |
1997 | } | |
1998 | ||
1999 | if (c) { | |
2000 | if (!c->sid[0]) { | |
2001 | rc = sidtab_context_to_sid(&sidtab, | |
2002 | &c->context[0], | |
2003 | &c->sid[0]); | |
2004 | if (rc) | |
2005 | goto out; | |
2006 | } | |
2007 | *out_sid = c->sid[0]; | |
2008 | } else { | |
2009 | *out_sid = SECINITSID_PORT; | |
2010 | } | |
2011 | ||
2012 | out: | |
0804d113 | 2013 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2014 | return rc; |
2015 | } | |
2016 | ||
2017 | /** | |
2018 | * security_netif_sid - Obtain the SID for a network interface. | |
2019 | * @name: interface name | |
2020 | * @if_sid: interface SID | |
1da177e4 | 2021 | */ |
e8bfdb9d | 2022 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
2023 | { |
2024 | int rc = 0; | |
2025 | struct ocontext *c; | |
2026 | ||
0804d113 | 2027 | read_lock(&policy_rwlock); |
1da177e4 LT |
2028 | |
2029 | c = policydb.ocontexts[OCON_NETIF]; | |
2030 | while (c) { | |
2031 | if (strcmp(name, c->u.name) == 0) | |
2032 | break; | |
2033 | c = c->next; | |
2034 | } | |
2035 | ||
2036 | if (c) { | |
2037 | if (!c->sid[0] || !c->sid[1]) { | |
2038 | rc = sidtab_context_to_sid(&sidtab, | |
2039 | &c->context[0], | |
2040 | &c->sid[0]); | |
2041 | if (rc) | |
2042 | goto out; | |
2043 | rc = sidtab_context_to_sid(&sidtab, | |
2044 | &c->context[1], | |
2045 | &c->sid[1]); | |
2046 | if (rc) | |
2047 | goto out; | |
2048 | } | |
2049 | *if_sid = c->sid[0]; | |
e8bfdb9d | 2050 | } else |
1da177e4 | 2051 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
2052 | |
2053 | out: | |
0804d113 | 2054 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2055 | return rc; |
2056 | } | |
2057 | ||
2058 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
2059 | { | |
2060 | int i, fail = 0; | |
2061 | ||
5d55a345 EP |
2062 | for (i = 0; i < 4; i++) |
2063 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
2064 | fail = 1; |
2065 | break; | |
2066 | } | |
2067 | ||
2068 | return !fail; | |
2069 | } | |
2070 | ||
2071 | /** | |
2072 | * security_node_sid - Obtain the SID for a node (host). | |
2073 | * @domain: communication domain aka address family | |
2074 | * @addrp: address | |
2075 | * @addrlen: address length in bytes | |
2076 | * @out_sid: security identifier | |
2077 | */ | |
2078 | int security_node_sid(u16 domain, | |
2079 | void *addrp, | |
2080 | u32 addrlen, | |
2081 | u32 *out_sid) | |
2082 | { | |
4b02b524 | 2083 | int rc; |
1da177e4 LT |
2084 | struct ocontext *c; |
2085 | ||
0804d113 | 2086 | read_lock(&policy_rwlock); |
1da177e4 LT |
2087 | |
2088 | switch (domain) { | |
2089 | case AF_INET: { | |
2090 | u32 addr; | |
2091 | ||
4b02b524 EP |
2092 | rc = -EINVAL; |
2093 | if (addrlen != sizeof(u32)) | |
1da177e4 | 2094 | goto out; |
1da177e4 LT |
2095 | |
2096 | addr = *((u32 *)addrp); | |
2097 | ||
2098 | c = policydb.ocontexts[OCON_NODE]; | |
2099 | while (c) { | |
2100 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
2101 | break; | |
2102 | c = c->next; | |
2103 | } | |
2104 | break; | |
2105 | } | |
2106 | ||
2107 | case AF_INET6: | |
4b02b524 EP |
2108 | rc = -EINVAL; |
2109 | if (addrlen != sizeof(u64) * 2) | |
1da177e4 | 2110 | goto out; |
1da177e4 LT |
2111 | c = policydb.ocontexts[OCON_NODE6]; |
2112 | while (c) { | |
2113 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
2114 | c->u.node6.mask)) | |
2115 | break; | |
2116 | c = c->next; | |
2117 | } | |
2118 | break; | |
2119 | ||
2120 | default: | |
4b02b524 | 2121 | rc = 0; |
1da177e4 LT |
2122 | *out_sid = SECINITSID_NODE; |
2123 | goto out; | |
2124 | } | |
2125 | ||
2126 | if (c) { | |
2127 | if (!c->sid[0]) { | |
2128 | rc = sidtab_context_to_sid(&sidtab, | |
2129 | &c->context[0], | |
2130 | &c->sid[0]); | |
2131 | if (rc) | |
2132 | goto out; | |
2133 | } | |
2134 | *out_sid = c->sid[0]; | |
2135 | } else { | |
2136 | *out_sid = SECINITSID_NODE; | |
2137 | } | |
2138 | ||
4b02b524 | 2139 | rc = 0; |
1da177e4 | 2140 | out: |
0804d113 | 2141 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2142 | return rc; |
2143 | } | |
2144 | ||
2145 | #define SIDS_NEL 25 | |
2146 | ||
2147 | /** | |
2148 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
2149 | * @fromsid: starting SID | |
2150 | * @username: username | |
2151 | * @sids: array of reachable SIDs for user | |
2152 | * @nel: number of elements in @sids | |
2153 | * | |
2154 | * Generate the set of SIDs for legal security contexts | |
2155 | * for a given user that can be reached by @fromsid. | |
2156 | * Set *@sids to point to a dynamically allocated | |
2157 | * array containing the set of SIDs. Set *@nel to the | |
2158 | * number of elements in the array. | |
2159 | */ | |
2160 | ||
2161 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 2162 | char *username, |
1da177e4 LT |
2163 | u32 **sids, |
2164 | u32 *nel) | |
2165 | { | |
2166 | struct context *fromcon, usercon; | |
2c3c05db | 2167 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
2168 | u32 mynel = 0, maxnel = SIDS_NEL; |
2169 | struct user_datum *user; | |
2170 | struct role_datum *role; | |
782ebb99 | 2171 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
2172 | int rc = 0, i, j; |
2173 | ||
2c3c05db SS |
2174 | *sids = NULL; |
2175 | *nel = 0; | |
2176 | ||
2177 | if (!ss_initialized) | |
1da177e4 | 2178 | goto out; |
1da177e4 | 2179 | |
0804d113 | 2180 | read_lock(&policy_rwlock); |
1da177e4 | 2181 | |
12b29f34 SS |
2182 | context_init(&usercon); |
2183 | ||
4b02b524 | 2184 | rc = -EINVAL; |
1da177e4 | 2185 | fromcon = sidtab_search(&sidtab, fromsid); |
4b02b524 | 2186 | if (!fromcon) |
1da177e4 | 2187 | goto out_unlock; |
1da177e4 | 2188 | |
4b02b524 | 2189 | rc = -EINVAL; |
1da177e4 | 2190 | user = hashtab_search(policydb.p_users.table, username); |
4b02b524 | 2191 | if (!user) |
1da177e4 | 2192 | goto out_unlock; |
4b02b524 | 2193 | |
1da177e4 LT |
2194 | usercon.user = user->value; |
2195 | ||
4b02b524 | 2196 | rc = -ENOMEM; |
89d155ef | 2197 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
4b02b524 | 2198 | if (!mysids) |
1da177e4 | 2199 | goto out_unlock; |
1da177e4 | 2200 | |
9fe79ad1 | 2201 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 | 2202 | role = policydb.role_val_to_struct[i]; |
c1a7368a | 2203 | usercon.role = i + 1; |
9fe79ad1 | 2204 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
c1a7368a | 2205 | usercon.type = j + 1; |
1da177e4 LT |
2206 | |
2207 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
2208 | continue; | |
2209 | ||
1da177e4 | 2210 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 2211 | if (rc) |
1da177e4 | 2212 | goto out_unlock; |
1da177e4 LT |
2213 | if (mynel < maxnel) { |
2214 | mysids[mynel++] = sid; | |
2215 | } else { | |
4b02b524 | 2216 | rc = -ENOMEM; |
1da177e4 | 2217 | maxnel += SIDS_NEL; |
89d155ef | 2218 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
4b02b524 | 2219 | if (!mysids2) |
1da177e4 | 2220 | goto out_unlock; |
1da177e4 LT |
2221 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2222 | kfree(mysids); | |
2223 | mysids = mysids2; | |
2224 | mysids[mynel++] = sid; | |
2225 | } | |
2226 | } | |
2227 | } | |
4b02b524 | 2228 | rc = 0; |
1da177e4 | 2229 | out_unlock: |
0804d113 | 2230 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2231 | if (rc || !mynel) { |
2232 | kfree(mysids); | |
2233 | goto out; | |
2234 | } | |
2235 | ||
4b02b524 | 2236 | rc = -ENOMEM; |
2c3c05db SS |
2237 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); |
2238 | if (!mysids2) { | |
2c3c05db SS |
2239 | kfree(mysids); |
2240 | goto out; | |
2241 | } | |
2242 | for (i = 0, j = 0; i < mynel; i++) { | |
f01e1af4 | 2243 | struct av_decision dummy_avd; |
2c3c05db | 2244 | rc = avc_has_perm_noaudit(fromsid, mysids[i], |
c6d3aaa4 | 2245 | SECCLASS_PROCESS, /* kernel value */ |
2c3c05db | 2246 | PROCESS__TRANSITION, AVC_STRICT, |
f01e1af4 | 2247 | &dummy_avd); |
2c3c05db SS |
2248 | if (!rc) |
2249 | mysids2[j++] = mysids[i]; | |
2250 | cond_resched(); | |
2251 | } | |
2252 | rc = 0; | |
2253 | kfree(mysids); | |
2254 | *sids = mysids2; | |
2255 | *nel = j; | |
1da177e4 LT |
2256 | out: |
2257 | return rc; | |
2258 | } | |
2259 | ||
2260 | /** | |
2261 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2262 | * @fstype: filesystem type | |
2263 | * @path: path from root of mount | |
2264 | * @sclass: file security class | |
2265 | * @sid: SID for path | |
2266 | * | |
2267 | * Obtain a SID to use for a file in a filesystem that | |
2268 | * cannot support xattr or use a fixed labeling behavior like | |
2269 | * transition SIDs or task SIDs. | |
2270 | */ | |
2271 | int security_genfs_sid(const char *fstype, | |
5d55a345 | 2272 | char *path, |
c6d3aaa4 | 2273 | u16 orig_sclass, |
1da177e4 LT |
2274 | u32 *sid) |
2275 | { | |
2276 | int len; | |
c6d3aaa4 | 2277 | u16 sclass; |
1da177e4 LT |
2278 | struct genfs *genfs; |
2279 | struct ocontext *c; | |
4b02b524 | 2280 | int rc, cmp = 0; |
1da177e4 | 2281 | |
b1aa5301 SS |
2282 | while (path[0] == '/' && path[1] == '/') |
2283 | path++; | |
2284 | ||
0804d113 | 2285 | read_lock(&policy_rwlock); |
1da177e4 | 2286 | |
c6d3aaa4 | 2287 | sclass = unmap_class(orig_sclass); |
4b02b524 | 2288 | *sid = SECINITSID_UNLABELED; |
c6d3aaa4 | 2289 | |
1da177e4 LT |
2290 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { |
2291 | cmp = strcmp(fstype, genfs->fstype); | |
2292 | if (cmp <= 0) | |
2293 | break; | |
2294 | } | |
2295 | ||
4b02b524 EP |
2296 | rc = -ENOENT; |
2297 | if (!genfs || cmp) | |
1da177e4 | 2298 | goto out; |
1da177e4 LT |
2299 | |
2300 | for (c = genfs->head; c; c = c->next) { | |
2301 | len = strlen(c->u.name); | |
2302 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2303 | (strncmp(c->u.name, path, len) == 0)) | |
2304 | break; | |
2305 | } | |
2306 | ||
4b02b524 EP |
2307 | rc = -ENOENT; |
2308 | if (!c) | |
1da177e4 | 2309 | goto out; |
1da177e4 LT |
2310 | |
2311 | if (!c->sid[0]) { | |
4b02b524 | 2312 | rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]); |
1da177e4 LT |
2313 | if (rc) |
2314 | goto out; | |
2315 | } | |
2316 | ||
2317 | *sid = c->sid[0]; | |
4b02b524 | 2318 | rc = 0; |
1da177e4 | 2319 | out: |
0804d113 | 2320 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2321 | return rc; |
2322 | } | |
2323 | ||
2324 | /** | |
2325 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
2326 | * @fstype: filesystem type | |
2327 | * @behavior: labeling behavior | |
2328 | * @sid: SID for filesystem (superblock) | |
2329 | */ | |
2330 | int security_fs_use( | |
2331 | const char *fstype, | |
2332 | unsigned int *behavior, | |
089be43e | 2333 | u32 *sid) |
1da177e4 LT |
2334 | { |
2335 | int rc = 0; | |
2336 | struct ocontext *c; | |
2337 | ||
0804d113 | 2338 | read_lock(&policy_rwlock); |
1da177e4 LT |
2339 | |
2340 | c = policydb.ocontexts[OCON_FSUSE]; | |
2341 | while (c) { | |
2342 | if (strcmp(fstype, c->u.name) == 0) | |
2343 | break; | |
2344 | c = c->next; | |
2345 | } | |
2346 | ||
2347 | if (c) { | |
2348 | *behavior = c->v.behavior; | |
2349 | if (!c->sid[0]) { | |
4b02b524 | 2350 | rc = sidtab_context_to_sid(&sidtab, &c->context[0], |
1da177e4 LT |
2351 | &c->sid[0]); |
2352 | if (rc) | |
2353 | goto out; | |
2354 | } | |
2355 | *sid = c->sid[0]; | |
2356 | } else { | |
089be43e JM |
2357 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); |
2358 | if (rc) { | |
2359 | *behavior = SECURITY_FS_USE_NONE; | |
2360 | rc = 0; | |
2361 | } else { | |
2362 | *behavior = SECURITY_FS_USE_GENFS; | |
2363 | } | |
1da177e4 LT |
2364 | } |
2365 | ||
2366 | out: | |
0804d113 | 2367 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2368 | return rc; |
2369 | } | |
2370 | ||
2371 | int security_get_bools(int *len, char ***names, int **values) | |
2372 | { | |
4b02b524 | 2373 | int i, rc; |
1da177e4 | 2374 | |
0804d113 | 2375 | read_lock(&policy_rwlock); |
1da177e4 LT |
2376 | *names = NULL; |
2377 | *values = NULL; | |
2378 | ||
4b02b524 | 2379 | rc = 0; |
1da177e4 | 2380 | *len = policydb.p_bools.nprim; |
4b02b524 | 2381 | if (!*len) |
1da177e4 | 2382 | goto out; |
1da177e4 | 2383 | |
4b02b524 EP |
2384 | rc = -ENOMEM; |
2385 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); | |
1da177e4 LT |
2386 | if (!*names) |
2387 | goto err; | |
1da177e4 | 2388 | |
4b02b524 EP |
2389 | rc = -ENOMEM; |
2390 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); | |
1da177e4 LT |
2391 | if (!*values) |
2392 | goto err; | |
2393 | ||
2394 | for (i = 0; i < *len; i++) { | |
2395 | size_t name_len; | |
4b02b524 | 2396 | |
1da177e4 | 2397 | (*values)[i] = policydb.bool_val_to_struct[i]->state; |
ac76c05b | 2398 | name_len = strlen(sym_name(&policydb, SYM_BOOLS, i)) + 1; |
4b02b524 EP |
2399 | |
2400 | rc = -ENOMEM; | |
2401 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); | |
1da177e4 LT |
2402 | if (!(*names)[i]) |
2403 | goto err; | |
4b02b524 | 2404 | |
ac76c05b | 2405 | strncpy((*names)[i], sym_name(&policydb, SYM_BOOLS, i), name_len); |
1da177e4 LT |
2406 | (*names)[i][name_len - 1] = 0; |
2407 | } | |
2408 | rc = 0; | |
2409 | out: | |
0804d113 | 2410 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2411 | return rc; |
2412 | err: | |
2413 | if (*names) { | |
2414 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2415 | kfree((*names)[i]); |
1da177e4 | 2416 | } |
9a5f04bf | 2417 | kfree(*values); |
1da177e4 LT |
2418 | goto out; |
2419 | } | |
2420 | ||
2421 | ||
2422 | int security_set_bools(int len, int *values) | |
2423 | { | |
4b02b524 | 2424 | int i, rc; |
1da177e4 LT |
2425 | int lenp, seqno = 0; |
2426 | struct cond_node *cur; | |
2427 | ||
0804d113 | 2428 | write_lock_irq(&policy_rwlock); |
1da177e4 | 2429 | |
4b02b524 | 2430 | rc = -EFAULT; |
1da177e4 | 2431 | lenp = policydb.p_bools.nprim; |
4b02b524 | 2432 | if (len != lenp) |
1da177e4 | 2433 | goto out; |
1da177e4 | 2434 | |
1da177e4 | 2435 | for (i = 0; i < len; i++) { |
af601e46 SG |
2436 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2437 | audit_log(current->audit_context, GFP_ATOMIC, | |
2438 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2439 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
ac76c05b | 2440 | sym_name(&policydb, SYM_BOOLS, i), |
af601e46 SG |
2441 | !!values[i], |
2442 | policydb.bool_val_to_struct[i]->state, | |
581abc09 | 2443 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 2444 | audit_get_sessionid(current)); |
af601e46 | 2445 | } |
5d55a345 | 2446 | if (values[i]) |
1da177e4 | 2447 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2448 | else |
1da177e4 | 2449 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2450 | } |
1da177e4 | 2451 | |
dbc74c65 | 2452 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2453 | rc = evaluate_cond_node(&policydb, cur); |
2454 | if (rc) | |
2455 | goto out; | |
2456 | } | |
2457 | ||
2458 | seqno = ++latest_granting; | |
4b02b524 | 2459 | rc = 0; |
1da177e4 | 2460 | out: |
0804d113 | 2461 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2462 | if (!rc) { |
2463 | avc_ss_reset(seqno); | |
2464 | selnl_notify_policyload(seqno); | |
11904167 | 2465 | selinux_status_update_policyload(seqno); |
342a0cff | 2466 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2467 | } |
2468 | return rc; | |
2469 | } | |
2470 | ||
2471 | int security_get_bool_value(int bool) | |
2472 | { | |
4b02b524 | 2473 | int rc; |
1da177e4 LT |
2474 | int len; |
2475 | ||
0804d113 | 2476 | read_lock(&policy_rwlock); |
1da177e4 | 2477 | |
4b02b524 | 2478 | rc = -EFAULT; |
1da177e4 | 2479 | len = policydb.p_bools.nprim; |
4b02b524 | 2480 | if (bool >= len) |
1da177e4 | 2481 | goto out; |
1da177e4 LT |
2482 | |
2483 | rc = policydb.bool_val_to_struct[bool]->state; | |
2484 | out: | |
0804d113 | 2485 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2486 | return rc; |
2487 | } | |
376bd9cb | 2488 | |
e900a7d9 SS |
2489 | static int security_preserve_bools(struct policydb *p) |
2490 | { | |
2491 | int rc, nbools = 0, *bvalues = NULL, i; | |
2492 | char **bnames = NULL; | |
2493 | struct cond_bool_datum *booldatum; | |
2494 | struct cond_node *cur; | |
2495 | ||
2496 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2497 | if (rc) | |
2498 | goto out; | |
2499 | for (i = 0; i < nbools; i++) { | |
2500 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2501 | if (booldatum) | |
2502 | booldatum->state = bvalues[i]; | |
2503 | } | |
dbc74c65 | 2504 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2505 | rc = evaluate_cond_node(p, cur); |
2506 | if (rc) | |
2507 | goto out; | |
2508 | } | |
2509 | ||
2510 | out: | |
2511 | if (bnames) { | |
2512 | for (i = 0; i < nbools; i++) | |
2513 | kfree(bnames[i]); | |
2514 | } | |
2515 | kfree(bnames); | |
2516 | kfree(bvalues); | |
2517 | return rc; | |
2518 | } | |
2519 | ||
08554d6b VY |
2520 | /* |
2521 | * security_sid_mls_copy() - computes a new sid based on the given | |
2522 | * sid and the mls portion of mls_sid. | |
2523 | */ | |
2524 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2525 | { | |
2526 | struct context *context1; | |
2527 | struct context *context2; | |
2528 | struct context newcon; | |
2529 | char *s; | |
2530 | u32 len; | |
4b02b524 | 2531 | int rc; |
08554d6b | 2532 | |
4b02b524 | 2533 | rc = 0; |
0719aaf5 | 2534 | if (!ss_initialized || !policydb.mls_enabled) { |
08554d6b VY |
2535 | *new_sid = sid; |
2536 | goto out; | |
2537 | } | |
2538 | ||
2539 | context_init(&newcon); | |
2540 | ||
0804d113 | 2541 | read_lock(&policy_rwlock); |
4b02b524 EP |
2542 | |
2543 | rc = -EINVAL; | |
08554d6b VY |
2544 | context1 = sidtab_search(&sidtab, sid); |
2545 | if (!context1) { | |
744ba35e EP |
2546 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2547 | __func__, sid); | |
08554d6b VY |
2548 | goto out_unlock; |
2549 | } | |
2550 | ||
4b02b524 | 2551 | rc = -EINVAL; |
08554d6b VY |
2552 | context2 = sidtab_search(&sidtab, mls_sid); |
2553 | if (!context2) { | |
744ba35e EP |
2554 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2555 | __func__, mls_sid); | |
08554d6b VY |
2556 | goto out_unlock; |
2557 | } | |
2558 | ||
2559 | newcon.user = context1->user; | |
2560 | newcon.role = context1->role; | |
2561 | newcon.type = context1->type; | |
0efc61ea | 2562 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2563 | if (rc) |
2564 | goto out_unlock; | |
2565 | ||
08554d6b VY |
2566 | /* Check the validity of the new context. */ |
2567 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2568 | rc = convert_context_handle_invalid_context(&newcon); | |
4b02b524 EP |
2569 | if (rc) { |
2570 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
2571 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2572 | "security_sid_mls_copy: invalid context %s", s); | |
2573 | kfree(s); | |
2574 | } | |
2575 | goto out_unlock; | |
2576 | } | |
08554d6b VY |
2577 | } |
2578 | ||
2579 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
08554d6b | 2580 | out_unlock: |
0804d113 | 2581 | read_unlock(&policy_rwlock); |
08554d6b VY |
2582 | context_destroy(&newcon); |
2583 | out: | |
2584 | return rc; | |
2585 | } | |
2586 | ||
220deb96 PM |
2587 | /** |
2588 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2589 | * @nlbl_sid: NetLabel SID | |
2590 | * @nlbl_type: NetLabel labeling protocol type | |
2591 | * @xfrm_sid: XFRM SID | |
2592 | * | |
2593 | * Description: | |
2594 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2595 | * resolved into a single SID it is returned via @peer_sid and the function | |
2596 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2597 | * returns a negative value. A table summarizing the behavior is below: | |
2598 | * | |
2599 | * | function return | @sid | |
2600 | * ------------------------------+-----------------+----------------- | |
2601 | * no peer labels | 0 | SECSID_NULL | |
2602 | * single peer label | 0 | <peer_label> | |
2603 | * multiple, consistent labels | 0 | <peer_label> | |
2604 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2605 | * | |
2606 | */ | |
2607 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2608 | u32 xfrm_sid, | |
2609 | u32 *peer_sid) | |
2610 | { | |
2611 | int rc; | |
2612 | struct context *nlbl_ctx; | |
2613 | struct context *xfrm_ctx; | |
2614 | ||
4b02b524 EP |
2615 | *peer_sid = SECSID_NULL; |
2616 | ||
220deb96 PM |
2617 | /* handle the common (which also happens to be the set of easy) cases |
2618 | * right away, these two if statements catch everything involving a | |
2619 | * single or absent peer SID/label */ | |
2620 | if (xfrm_sid == SECSID_NULL) { | |
2621 | *peer_sid = nlbl_sid; | |
2622 | return 0; | |
2623 | } | |
2624 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2625 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2626 | * is present */ | |
2627 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2628 | *peer_sid = xfrm_sid; | |
2629 | return 0; | |
2630 | } | |
2631 | ||
2632 | /* we don't need to check ss_initialized here since the only way both | |
2633 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2634 | * security server was initialized and ss_initialized was true */ | |
4b02b524 | 2635 | if (!policydb.mls_enabled) |
220deb96 | 2636 | return 0; |
220deb96 | 2637 | |
0804d113 | 2638 | read_lock(&policy_rwlock); |
220deb96 | 2639 | |
4b02b524 | 2640 | rc = -EINVAL; |
220deb96 PM |
2641 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); |
2642 | if (!nlbl_ctx) { | |
744ba35e EP |
2643 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2644 | __func__, nlbl_sid); | |
4b02b524 | 2645 | goto out; |
220deb96 | 2646 | } |
4b02b524 | 2647 | rc = -EINVAL; |
220deb96 PM |
2648 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); |
2649 | if (!xfrm_ctx) { | |
744ba35e EP |
2650 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2651 | __func__, xfrm_sid); | |
4b02b524 | 2652 | goto out; |
220deb96 PM |
2653 | } |
2654 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
4b02b524 EP |
2655 | if (rc) |
2656 | goto out; | |
220deb96 | 2657 | |
4b02b524 EP |
2658 | /* at present NetLabel SIDs/labels really only carry MLS |
2659 | * information so if the MLS portion of the NetLabel SID | |
2660 | * matches the MLS portion of the labeled XFRM SID/label | |
2661 | * then pass along the XFRM SID as it is the most | |
2662 | * expressive */ | |
2663 | *peer_sid = xfrm_sid; | |
2664 | out: | |
0804d113 | 2665 | read_unlock(&policy_rwlock); |
220deb96 PM |
2666 | return rc; |
2667 | } | |
2668 | ||
55fcf09b CP |
2669 | static int get_classes_callback(void *k, void *d, void *args) |
2670 | { | |
2671 | struct class_datum *datum = d; | |
2672 | char *name = k, **classes = args; | |
2673 | int value = datum->value - 1; | |
2674 | ||
2675 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
2676 | if (!classes[value]) | |
2677 | return -ENOMEM; | |
2678 | ||
2679 | return 0; | |
2680 | } | |
2681 | ||
2682 | int security_get_classes(char ***classes, int *nclasses) | |
2683 | { | |
4b02b524 | 2684 | int rc; |
55fcf09b | 2685 | |
0804d113 | 2686 | read_lock(&policy_rwlock); |
55fcf09b | 2687 | |
4b02b524 | 2688 | rc = -ENOMEM; |
55fcf09b | 2689 | *nclasses = policydb.p_classes.nprim; |
9f59f90b | 2690 | *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC); |
55fcf09b CP |
2691 | if (!*classes) |
2692 | goto out; | |
2693 | ||
2694 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
2695 | *classes); | |
4b02b524 | 2696 | if (rc) { |
55fcf09b CP |
2697 | int i; |
2698 | for (i = 0; i < *nclasses; i++) | |
2699 | kfree((*classes)[i]); | |
2700 | kfree(*classes); | |
2701 | } | |
2702 | ||
2703 | out: | |
0804d113 | 2704 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2705 | return rc; |
2706 | } | |
2707 | ||
2708 | static int get_permissions_callback(void *k, void *d, void *args) | |
2709 | { | |
2710 | struct perm_datum *datum = d; | |
2711 | char *name = k, **perms = args; | |
2712 | int value = datum->value - 1; | |
2713 | ||
2714 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
2715 | if (!perms[value]) | |
2716 | return -ENOMEM; | |
2717 | ||
2718 | return 0; | |
2719 | } | |
2720 | ||
2721 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
2722 | { | |
4b02b524 | 2723 | int rc, i; |
55fcf09b CP |
2724 | struct class_datum *match; |
2725 | ||
0804d113 | 2726 | read_lock(&policy_rwlock); |
55fcf09b | 2727 | |
4b02b524 | 2728 | rc = -EINVAL; |
55fcf09b CP |
2729 | match = hashtab_search(policydb.p_classes.table, class); |
2730 | if (!match) { | |
744ba35e | 2731 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 2732 | __func__, class); |
55fcf09b CP |
2733 | goto out; |
2734 | } | |
2735 | ||
4b02b524 | 2736 | rc = -ENOMEM; |
55fcf09b | 2737 | *nperms = match->permissions.nprim; |
9f59f90b | 2738 | *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC); |
55fcf09b CP |
2739 | if (!*perms) |
2740 | goto out; | |
2741 | ||
2742 | if (match->comdatum) { | |
2743 | rc = hashtab_map(match->comdatum->permissions.table, | |
2744 | get_permissions_callback, *perms); | |
4b02b524 | 2745 | if (rc) |
55fcf09b CP |
2746 | goto err; |
2747 | } | |
2748 | ||
2749 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
2750 | *perms); | |
4b02b524 | 2751 | if (rc) |
55fcf09b CP |
2752 | goto err; |
2753 | ||
2754 | out: | |
0804d113 | 2755 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2756 | return rc; |
2757 | ||
2758 | err: | |
0804d113 | 2759 | read_unlock(&policy_rwlock); |
55fcf09b CP |
2760 | for (i = 0; i < *nperms; i++) |
2761 | kfree((*perms)[i]); | |
2762 | kfree(*perms); | |
2763 | return rc; | |
2764 | } | |
2765 | ||
3f12070e EP |
2766 | int security_get_reject_unknown(void) |
2767 | { | |
2768 | return policydb.reject_unknown; | |
2769 | } | |
2770 | ||
2771 | int security_get_allow_unknown(void) | |
2772 | { | |
2773 | return policydb.allow_unknown; | |
2774 | } | |
2775 | ||
3bb56b25 PM |
2776 | /** |
2777 | * security_policycap_supported - Check for a specific policy capability | |
2778 | * @req_cap: capability | |
2779 | * | |
2780 | * Description: | |
2781 | * This function queries the currently loaded policy to see if it supports the | |
2782 | * capability specified by @req_cap. Returns true (1) if the capability is | |
2783 | * supported, false (0) if it isn't supported. | |
2784 | * | |
2785 | */ | |
2786 | int security_policycap_supported(unsigned int req_cap) | |
2787 | { | |
2788 | int rc; | |
2789 | ||
0804d113 | 2790 | read_lock(&policy_rwlock); |
3bb56b25 | 2791 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 2792 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
2793 | |
2794 | return rc; | |
2795 | } | |
2796 | ||
376bd9cb DG |
2797 | struct selinux_audit_rule { |
2798 | u32 au_seqno; | |
2799 | struct context au_ctxt; | |
2800 | }; | |
2801 | ||
9d57a7f9 | 2802 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 2803 | { |
9d57a7f9 AD |
2804 | struct selinux_audit_rule *rule = vrule; |
2805 | ||
376bd9cb DG |
2806 | if (rule) { |
2807 | context_destroy(&rule->au_ctxt); | |
2808 | kfree(rule); | |
2809 | } | |
2810 | } | |
2811 | ||
9d57a7f9 | 2812 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
2813 | { |
2814 | struct selinux_audit_rule *tmprule; | |
2815 | struct role_datum *roledatum; | |
2816 | struct type_datum *typedatum; | |
2817 | struct user_datum *userdatum; | |
9d57a7f9 | 2818 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
2819 | int rc = 0; |
2820 | ||
2821 | *rule = NULL; | |
2822 | ||
2823 | if (!ss_initialized) | |
3ad40d64 | 2824 | return -EOPNOTSUPP; |
376bd9cb DG |
2825 | |
2826 | switch (field) { | |
3a6b9f85 DG |
2827 | case AUDIT_SUBJ_USER: |
2828 | case AUDIT_SUBJ_ROLE: | |
2829 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
2830 | case AUDIT_OBJ_USER: |
2831 | case AUDIT_OBJ_ROLE: | |
2832 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 2833 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 2834 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
2835 | return -EINVAL; |
2836 | break; | |
3a6b9f85 DG |
2837 | case AUDIT_SUBJ_SEN: |
2838 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2839 | case AUDIT_OBJ_LEV_LOW: |
2840 | case AUDIT_OBJ_LEV_HIGH: | |
25985edc | 2841 | /* we do not allow a range, indicated by the presence of '-' */ |
376bd9cb DG |
2842 | if (strchr(rulestr, '-')) |
2843 | return -EINVAL; | |
2844 | break; | |
2845 | default: | |
2846 | /* only the above fields are valid */ | |
2847 | return -EINVAL; | |
2848 | } | |
2849 | ||
2850 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
2851 | if (!tmprule) | |
2852 | return -ENOMEM; | |
2853 | ||
2854 | context_init(&tmprule->au_ctxt); | |
2855 | ||
0804d113 | 2856 | read_lock(&policy_rwlock); |
376bd9cb DG |
2857 | |
2858 | tmprule->au_seqno = latest_granting; | |
2859 | ||
2860 | switch (field) { | |
3a6b9f85 | 2861 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2862 | case AUDIT_OBJ_USER: |
4b02b524 | 2863 | rc = -EINVAL; |
376bd9cb DG |
2864 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
2865 | if (!userdatum) | |
4b02b524 EP |
2866 | goto out; |
2867 | tmprule->au_ctxt.user = userdatum->value; | |
376bd9cb | 2868 | break; |
3a6b9f85 | 2869 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2870 | case AUDIT_OBJ_ROLE: |
4b02b524 | 2871 | rc = -EINVAL; |
376bd9cb DG |
2872 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
2873 | if (!roledatum) | |
4b02b524 EP |
2874 | goto out; |
2875 | tmprule->au_ctxt.role = roledatum->value; | |
376bd9cb | 2876 | break; |
3a6b9f85 | 2877 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2878 | case AUDIT_OBJ_TYPE: |
4b02b524 | 2879 | rc = -EINVAL; |
376bd9cb DG |
2880 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
2881 | if (!typedatum) | |
4b02b524 EP |
2882 | goto out; |
2883 | tmprule->au_ctxt.type = typedatum->value; | |
376bd9cb | 2884 | break; |
3a6b9f85 DG |
2885 | case AUDIT_SUBJ_SEN: |
2886 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
2887 | case AUDIT_OBJ_LEV_LOW: |
2888 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb | 2889 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
4b02b524 EP |
2890 | if (rc) |
2891 | goto out; | |
376bd9cb DG |
2892 | break; |
2893 | } | |
4b02b524 EP |
2894 | rc = 0; |
2895 | out: | |
0804d113 | 2896 | read_unlock(&policy_rwlock); |
376bd9cb DG |
2897 | |
2898 | if (rc) { | |
2899 | selinux_audit_rule_free(tmprule); | |
2900 | tmprule = NULL; | |
2901 | } | |
2902 | ||
2903 | *rule = tmprule; | |
2904 | ||
2905 | return rc; | |
2906 | } | |
2907 | ||
9d57a7f9 AD |
2908 | /* Check to see if the rule contains any selinux fields */ |
2909 | int selinux_audit_rule_known(struct audit_krule *rule) | |
2910 | { | |
2911 | int i; | |
2912 | ||
2913 | for (i = 0; i < rule->field_count; i++) { | |
2914 | struct audit_field *f = &rule->fields[i]; | |
2915 | switch (f->type) { | |
2916 | case AUDIT_SUBJ_USER: | |
2917 | case AUDIT_SUBJ_ROLE: | |
2918 | case AUDIT_SUBJ_TYPE: | |
2919 | case AUDIT_SUBJ_SEN: | |
2920 | case AUDIT_SUBJ_CLR: | |
2921 | case AUDIT_OBJ_USER: | |
2922 | case AUDIT_OBJ_ROLE: | |
2923 | case AUDIT_OBJ_TYPE: | |
2924 | case AUDIT_OBJ_LEV_LOW: | |
2925 | case AUDIT_OBJ_LEV_HIGH: | |
2926 | return 1; | |
2927 | } | |
2928 | } | |
2929 | ||
2930 | return 0; | |
2931 | } | |
2932 | ||
2933 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 2934 | struct audit_context *actx) |
376bd9cb DG |
2935 | { |
2936 | struct context *ctxt; | |
2937 | struct mls_level *level; | |
9d57a7f9 | 2938 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
2939 | int match = 0; |
2940 | ||
2941 | if (!rule) { | |
2942 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2943 | "selinux_audit_rule_match: missing rule\n"); |
376bd9cb DG |
2944 | return -ENOENT; |
2945 | } | |
2946 | ||
0804d113 | 2947 | read_lock(&policy_rwlock); |
376bd9cb DG |
2948 | |
2949 | if (rule->au_seqno < latest_granting) { | |
2950 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 | 2951 | "selinux_audit_rule_match: stale rule\n"); |
376bd9cb DG |
2952 | match = -ESTALE; |
2953 | goto out; | |
2954 | } | |
2955 | ||
9a2f44f0 | 2956 | ctxt = sidtab_search(&sidtab, sid); |
376bd9cb DG |
2957 | if (!ctxt) { |
2958 | audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
5d55a345 EP |
2959 | "selinux_audit_rule_match: unrecognized SID %d\n", |
2960 | sid); | |
376bd9cb DG |
2961 | match = -ENOENT; |
2962 | goto out; | |
2963 | } | |
2964 | ||
2965 | /* a field/op pair that is not caught here will simply fall through | |
2966 | without a match */ | |
2967 | switch (field) { | |
3a6b9f85 | 2968 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 2969 | case AUDIT_OBJ_USER: |
376bd9cb | 2970 | switch (op) { |
5af75d8d | 2971 | case Audit_equal: |
376bd9cb DG |
2972 | match = (ctxt->user == rule->au_ctxt.user); |
2973 | break; | |
5af75d8d | 2974 | case Audit_not_equal: |
376bd9cb DG |
2975 | match = (ctxt->user != rule->au_ctxt.user); |
2976 | break; | |
2977 | } | |
2978 | break; | |
3a6b9f85 | 2979 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 2980 | case AUDIT_OBJ_ROLE: |
376bd9cb | 2981 | switch (op) { |
5af75d8d | 2982 | case Audit_equal: |
376bd9cb DG |
2983 | match = (ctxt->role == rule->au_ctxt.role); |
2984 | break; | |
5af75d8d | 2985 | case Audit_not_equal: |
376bd9cb DG |
2986 | match = (ctxt->role != rule->au_ctxt.role); |
2987 | break; | |
2988 | } | |
2989 | break; | |
3a6b9f85 | 2990 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 2991 | case AUDIT_OBJ_TYPE: |
376bd9cb | 2992 | switch (op) { |
5af75d8d | 2993 | case Audit_equal: |
376bd9cb DG |
2994 | match = (ctxt->type == rule->au_ctxt.type); |
2995 | break; | |
5af75d8d | 2996 | case Audit_not_equal: |
376bd9cb DG |
2997 | match = (ctxt->type != rule->au_ctxt.type); |
2998 | break; | |
2999 | } | |
3000 | break; | |
3a6b9f85 DG |
3001 | case AUDIT_SUBJ_SEN: |
3002 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3003 | case AUDIT_OBJ_LEV_LOW: |
3004 | case AUDIT_OBJ_LEV_HIGH: | |
3005 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
3006 | field == AUDIT_OBJ_LEV_LOW) ? |
3007 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 3008 | switch (op) { |
5af75d8d | 3009 | case Audit_equal: |
376bd9cb | 3010 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3011 | level); |
376bd9cb | 3012 | break; |
5af75d8d | 3013 | case Audit_not_equal: |
376bd9cb | 3014 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3015 | level); |
376bd9cb | 3016 | break; |
5af75d8d | 3017 | case Audit_lt: |
376bd9cb | 3018 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
3019 | level) && |
3020 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
3021 | level)); | |
376bd9cb | 3022 | break; |
5af75d8d | 3023 | case Audit_le: |
376bd9cb | 3024 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 3025 | level); |
376bd9cb | 3026 | break; |
5af75d8d | 3027 | case Audit_gt: |
376bd9cb | 3028 | match = (mls_level_dom(level, |
5d55a345 EP |
3029 | &rule->au_ctxt.range.level[0]) && |
3030 | !mls_level_eq(level, | |
3031 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 3032 | break; |
5af75d8d | 3033 | case Audit_ge: |
376bd9cb | 3034 | match = mls_level_dom(level, |
5d55a345 | 3035 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
3036 | break; |
3037 | } | |
3038 | } | |
3039 | ||
3040 | out: | |
0804d113 | 3041 | read_unlock(&policy_rwlock); |
376bd9cb DG |
3042 | return match; |
3043 | } | |
3044 | ||
9d57a7f9 | 3045 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb | 3046 | |
562c99f2 | 3047 | static int aurule_avc_callback(u32 event) |
376bd9cb DG |
3048 | { |
3049 | int err = 0; | |
3050 | ||
3051 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
3052 | err = aurule_callback(); | |
3053 | return err; | |
3054 | } | |
3055 | ||
3056 | static int __init aurule_init(void) | |
3057 | { | |
3058 | int err; | |
3059 | ||
562c99f2 | 3060 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET); |
376bd9cb DG |
3061 | if (err) |
3062 | panic("avc_add_callback() failed, error %d\n", err); | |
3063 | ||
3064 | return err; | |
3065 | } | |
3066 | __initcall(aurule_init); | |
3067 | ||
7420ed23 | 3068 | #ifdef CONFIG_NETLABEL |
7420ed23 | 3069 | /** |
5778eabd PM |
3070 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
3071 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 3072 | * @sid: the SELinux SID |
7420ed23 VY |
3073 | * |
3074 | * Description: | |
3075 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
3076 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
3077 | * already been initialized. | |
7420ed23 VY |
3078 | * |
3079 | */ | |
5778eabd | 3080 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 3081 | u32 sid) |
7420ed23 | 3082 | { |
5dbe1eb0 | 3083 | u32 *sid_cache; |
7420ed23 | 3084 | |
5dbe1eb0 PM |
3085 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
3086 | if (sid_cache == NULL) | |
5778eabd | 3087 | return; |
5dbe1eb0 PM |
3088 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
3089 | if (secattr->cache == NULL) { | |
3090 | kfree(sid_cache); | |
5778eabd | 3091 | return; |
0ec8abd7 | 3092 | } |
7420ed23 | 3093 | |
5dbe1eb0 PM |
3094 | *sid_cache = sid; |
3095 | secattr->cache->free = kfree; | |
3096 | secattr->cache->data = sid_cache; | |
5778eabd | 3097 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
3098 | } |
3099 | ||
3100 | /** | |
5778eabd | 3101 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 3102 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
3103 | * @sid: the SELinux SID |
3104 | * | |
3105 | * Description: | |
5778eabd | 3106 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 3107 | * SELinux SID. If the @secattr field does not contain a full SELinux |
25985edc | 3108 | * SID/context then use SECINITSID_NETMSG as the foundation. If possible the |
5dbe1eb0 PM |
3109 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to |
3110 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
3111 | * conversion for future lookups. Returns zero on success, negative values on | |
3112 | * failure. | |
7420ed23 VY |
3113 | * |
3114 | */ | |
5778eabd | 3115 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 3116 | u32 *sid) |
7420ed23 | 3117 | { |
7ae9f23c | 3118 | int rc; |
7420ed23 VY |
3119 | struct context *ctx; |
3120 | struct context ctx_new; | |
5778eabd PM |
3121 | |
3122 | if (!ss_initialized) { | |
3123 | *sid = SECSID_NULL; | |
3124 | return 0; | |
3125 | } | |
7420ed23 | 3126 | |
0804d113 | 3127 | read_lock(&policy_rwlock); |
7420ed23 | 3128 | |
7ae9f23c | 3129 | if (secattr->flags & NETLBL_SECATTR_CACHE) |
5dbe1eb0 | 3130 | *sid = *(u32 *)secattr->cache->data; |
7ae9f23c | 3131 | else if (secattr->flags & NETLBL_SECATTR_SECID) |
16efd454 | 3132 | *sid = secattr->attr.secid; |
7ae9f23c EP |
3133 | else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
3134 | rc = -EIDRM; | |
5dbe1eb0 | 3135 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 | 3136 | if (ctx == NULL) |
7ae9f23c | 3137 | goto out; |
7420ed23 | 3138 | |
81990fbd | 3139 | context_init(&ctx_new); |
7420ed23 VY |
3140 | ctx_new.user = ctx->user; |
3141 | ctx_new.role = ctx->role; | |
3142 | ctx_new.type = ctx->type; | |
02752760 | 3143 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 3144 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
7ae9f23c EP |
3145 | rc = ebitmap_netlbl_import(&ctx_new.range.level[0].cat, |
3146 | secattr->attr.mls.cat); | |
3147 | if (rc) | |
3148 | goto out; | |
81990fbd PM |
3149 | memcpy(&ctx_new.range.level[1].cat, |
3150 | &ctx_new.range.level[0].cat, | |
3151 | sizeof(ctx_new.range.level[0].cat)); | |
7420ed23 | 3152 | } |
7ae9f23c EP |
3153 | rc = -EIDRM; |
3154 | if (!mls_context_isvalid(&policydb, &ctx_new)) | |
3155 | goto out_free; | |
7420ed23 VY |
3156 | |
3157 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
7ae9f23c EP |
3158 | if (rc) |
3159 | goto out_free; | |
7420ed23 | 3160 | |
5dbe1eb0 | 3161 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 3162 | |
7420ed23 | 3163 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c | 3164 | } else |
388b2405 | 3165 | *sid = SECSID_NULL; |
7420ed23 | 3166 | |
0804d113 | 3167 | read_unlock(&policy_rwlock); |
7ae9f23c EP |
3168 | return 0; |
3169 | out_free: | |
7420ed23 | 3170 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c EP |
3171 | out: |
3172 | read_unlock(&policy_rwlock); | |
3173 | return rc; | |
7420ed23 VY |
3174 | } |
3175 | ||
3176 | /** | |
5778eabd PM |
3177 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
3178 | * @sid: the SELinux SID | |
3179 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
3180 | * |
3181 | * Description: | |
5778eabd PM |
3182 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
3183 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
3184 | * |
3185 | */ | |
5778eabd | 3186 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 3187 | { |
99d854d2 | 3188 | int rc; |
7420ed23 VY |
3189 | struct context *ctx; |
3190 | ||
3191 | if (!ss_initialized) | |
3192 | return 0; | |
3193 | ||
0804d113 | 3194 | read_lock(&policy_rwlock); |
4b02b524 EP |
3195 | |
3196 | rc = -ENOENT; | |
7420ed23 | 3197 | ctx = sidtab_search(&sidtab, sid); |
4b02b524 EP |
3198 | if (ctx == NULL) |
3199 | goto out; | |
3200 | ||
3201 | rc = -ENOMEM; | |
ac76c05b | 3202 | secattr->domain = kstrdup(sym_name(&policydb, SYM_TYPES, ctx->type - 1), |
5778eabd | 3203 | GFP_ATOMIC); |
4b02b524 EP |
3204 | if (secattr->domain == NULL) |
3205 | goto out; | |
3206 | ||
8d75899d PM |
3207 | secattr->attr.secid = sid; |
3208 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
3209 | mls_export_netlbl_lvl(ctx, secattr); |
3210 | rc = mls_export_netlbl_cat(ctx, secattr); | |
4b02b524 | 3211 | out: |
0804d113 | 3212 | read_unlock(&policy_rwlock); |
f8687afe PM |
3213 | return rc; |
3214 | } | |
7420ed23 | 3215 | #endif /* CONFIG_NETLABEL */ |
cee74f47 EP |
3216 | |
3217 | /** | |
3218 | * security_read_policy - read the policy. | |
3219 | * @data: binary policy data | |
3220 | * @len: length of data in bytes | |
3221 | * | |
3222 | */ | |
6b697323 | 3223 | int security_read_policy(void **data, size_t *len) |
cee74f47 EP |
3224 | { |
3225 | int rc; | |
3226 | struct policy_file fp; | |
3227 | ||
3228 | if (!ss_initialized) | |
3229 | return -EINVAL; | |
3230 | ||
3231 | *len = security_policydb_len(); | |
3232 | ||
845ca30f | 3233 | *data = vmalloc_user(*len); |
cee74f47 EP |
3234 | if (!*data) |
3235 | return -ENOMEM; | |
3236 | ||
3237 | fp.data = *data; | |
3238 | fp.len = *len; | |
3239 | ||
3240 | read_lock(&policy_rwlock); | |
3241 | rc = policydb_write(&policydb, &fp); | |
3242 | read_unlock(&policy_rwlock); | |
3243 | ||
3244 | if (rc) | |
3245 | return rc; | |
3246 | ||
3247 | *len = (unsigned long)fp.data - (unsigned long)*data; | |
3248 | return 0; | |
3249 | ||
3250 | } |