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