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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Implementation of the security services. | |
3 | * | |
7efbb60b | 4 | * Authors : Stephen Smalley, <sds@tycho.nsa.gov> |
5d55a345 | 5 | * James Morris <jmorris@redhat.com> |
1da177e4 LT |
6 | * |
7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
8 | * | |
9 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 10 | * Support for context based audit filters. |
1da177e4 LT |
11 | * |
12 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
13 | * | |
5d55a345 | 14 | * Added conditional policy language extensions |
1da177e4 | 15 | * |
82c21bfa | 16 | * Updated: Hewlett-Packard <paul@paul-moore.com> |
7420ed23 VY |
17 | * |
18 | * Added support for NetLabel | |
3bb56b25 | 19 | * Added support for the policy capability bitmap |
7420ed23 | 20 | * |
b94c7e67 CS |
21 | * Updated: Chad Sellers <csellers@tresys.com> |
22 | * | |
23 | * Added validation of kernel classes and permissions | |
24 | * | |
44c2d9bd KK |
25 | * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com> |
26 | * | |
27 | * Added support for bounds domain and audit messaged on masked permissions | |
28 | * | |
0719aaf5 GT |
29 | * Updated: Guido Trentalancia <guido@trentalancia.com> |
30 | * | |
31 | * Added support for runtime switching of the policy type | |
32 | * | |
44c2d9bd | 33 | * Copyright (C) 2008, 2009 NEC Corporation |
3bb56b25 | 34 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
376bd9cb | 35 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 36 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 LT |
37 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
38 | * This program is free software; you can redistribute it and/or modify | |
5d55a345 | 39 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
40 | * the Free Software Foundation, version 2. |
41 | */ | |
42 | #include <linux/kernel.h> | |
43 | #include <linux/slab.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/spinlock.h> | |
9f2ad665 | 46 | #include <linux/rcupdate.h> |
1da177e4 LT |
47 | #include <linux/errno.h> |
48 | #include <linux/in.h> | |
49 | #include <linux/sched.h> | |
50 | #include <linux/audit.h> | |
bb003079 | 51 | #include <linux/mutex.h> |
0e55a004 | 52 | #include <linux/selinux.h> |
6371dcd3 | 53 | #include <linux/flex_array.h> |
f0d3d989 | 54 | #include <linux/vmalloc.h> |
7a90fc39 | 55 | #include <linux/lsm_hooks.h> |
7420ed23 | 56 | #include <net/netlabel.h> |
bb003079 | 57 | |
1da177e4 LT |
58 | #include "flask.h" |
59 | #include "avc.h" | |
60 | #include "avc_ss.h" | |
61 | #include "security.h" | |
62 | #include "context.h" | |
63 | #include "policydb.h" | |
64 | #include "sidtab.h" | |
65 | #include "services.h" | |
66 | #include "conditional.h" | |
67 | #include "mls.h" | |
7420ed23 | 68 | #include "objsec.h" |
c60475bf | 69 | #include "netlabel.h" |
3de4bab5 | 70 | #include "xfrm.h" |
02752760 | 71 | #include "ebitmap.h" |
9d57a7f9 | 72 | #include "audit.h" |
1da177e4 | 73 | |
4dc2fce3 SS |
74 | /* Policy capability names */ |
75 | char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX] = { | |
76 | "network_peer_controls", | |
77 | "open_perms", | |
78 | "extended_socket_class", | |
79 | "always_check_network", | |
af63f419 SS |
80 | "cgroup_seclabel", |
81 | "nnp_nosuid_transition" | |
4dc2fce3 SS |
82 | }; |
83 | ||
3bb56b25 | 84 | int selinux_policycap_netpeer; |
b0c636b9 | 85 | int selinux_policycap_openperm; |
da69a530 | 86 | int selinux_policycap_extsockclass; |
2be4d74f | 87 | int selinux_policycap_alwaysnetwork; |
2651225b | 88 | int selinux_policycap_cgroupseclabel; |
af63f419 | 89 | int selinux_policycap_nnp_nosuid_transition; |
3bb56b25 | 90 | |
1da177e4 | 91 | static DEFINE_RWLOCK(policy_rwlock); |
1da177e4 LT |
92 | |
93 | static struct sidtab sidtab; | |
94 | struct policydb policydb; | |
5d55a345 | 95 | int ss_initialized; |
1da177e4 LT |
96 | |
97 | /* | |
98 | * The largest sequence number that has been used when | |
99 | * providing an access decision to the access vector cache. | |
100 | * The sequence number only changes when a policy change | |
101 | * occurs. | |
102 | */ | |
5d55a345 | 103 | static u32 latest_granting; |
1da177e4 LT |
104 | |
105 | /* Forward declaration. */ | |
106 | static int context_struct_to_string(struct context *context, char **scontext, | |
107 | u32 *scontext_len); | |
108 | ||
19439d05 | 109 | static void context_struct_compute_av(struct context *scontext, |
fa1aa143 JVS |
110 | struct context *tcontext, |
111 | u16 tclass, | |
112 | struct av_decision *avd, | |
113 | struct extended_perms *xperms); | |
c6d3aaa4 SS |
114 | |
115 | struct selinux_mapping { | |
116 | u16 value; /* policy value */ | |
117 | unsigned num_perms; | |
118 | u32 perms[sizeof(u32) * 8]; | |
119 | }; | |
120 | ||
121 | static struct selinux_mapping *current_mapping; | |
122 | static u16 current_mapping_size; | |
123 | ||
124 | static int selinux_set_mapping(struct policydb *pol, | |
125 | struct security_class_mapping *map, | |
126 | struct selinux_mapping **out_map_p, | |
127 | u16 *out_map_size) | |
128 | { | |
129 | struct selinux_mapping *out_map = NULL; | |
130 | size_t size = sizeof(struct selinux_mapping); | |
131 | u16 i, j; | |
132 | unsigned k; | |
133 | bool print_unknown_handle = false; | |
134 | ||
135 | /* Find number of classes in the input mapping */ | |
136 | if (!map) | |
137 | return -EINVAL; | |
138 | i = 0; | |
139 | while (map[i].name) | |
140 | i++; | |
141 | ||
142 | /* Allocate space for the class records, plus one for class zero */ | |
143 | out_map = kcalloc(++i, size, GFP_ATOMIC); | |
144 | if (!out_map) | |
145 | return -ENOMEM; | |
146 | ||
147 | /* Store the raw class and permission values */ | |
148 | j = 0; | |
149 | while (map[j].name) { | |
150 | struct security_class_mapping *p_in = map + (j++); | |
151 | struct selinux_mapping *p_out = out_map + j; | |
152 | ||
153 | /* An empty class string skips ahead */ | |
154 | if (!strcmp(p_in->name, "")) { | |
155 | p_out->num_perms = 0; | |
156 | continue; | |
157 | } | |
158 | ||
159 | p_out->value = string_to_security_class(pol, p_in->name); | |
160 | if (!p_out->value) { | |
161 | printk(KERN_INFO | |
162 | "SELinux: Class %s not defined in policy.\n", | |
163 | p_in->name); | |
164 | if (pol->reject_unknown) | |
165 | goto err; | |
166 | p_out->num_perms = 0; | |
167 | print_unknown_handle = true; | |
168 | continue; | |
169 | } | |
170 | ||
171 | k = 0; | |
342e9157 | 172 | while (p_in->perms[k]) { |
c6d3aaa4 SS |
173 | /* An empty permission string skips ahead */ |
174 | if (!*p_in->perms[k]) { | |
175 | k++; | |
176 | continue; | |
177 | } | |
178 | p_out->perms[k] = string_to_av_perm(pol, p_out->value, | |
179 | p_in->perms[k]); | |
180 | if (!p_out->perms[k]) { | |
181 | printk(KERN_INFO | |
182 | "SELinux: Permission %s in class %s not defined in policy.\n", | |
183 | p_in->perms[k], p_in->name); | |
184 | if (pol->reject_unknown) | |
185 | goto err; | |
186 | print_unknown_handle = true; | |
187 | } | |
188 | ||
189 | k++; | |
190 | } | |
191 | p_out->num_perms = k; | |
192 | } | |
193 | ||
194 | if (print_unknown_handle) | |
195 | printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n", | |
196 | pol->allow_unknown ? "allowed" : "denied"); | |
197 | ||
198 | *out_map_p = out_map; | |
199 | *out_map_size = i; | |
200 | return 0; | |
201 | err: | |
202 | kfree(out_map); | |
203 | return -EINVAL; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Get real, policy values from mapped values | |
208 | */ | |
209 | ||
210 | static u16 unmap_class(u16 tclass) | |
211 | { | |
212 | if (tclass < current_mapping_size) | |
213 | return current_mapping[tclass].value; | |
214 | ||
215 | return tclass; | |
216 | } | |
217 | ||
6f5317e7 HC |
218 | /* |
219 | * Get kernel value for class from its policy value | |
220 | */ | |
221 | static u16 map_class(u16 pol_value) | |
222 | { | |
223 | u16 i; | |
224 | ||
225 | for (i = 1; i < current_mapping_size; i++) { | |
226 | if (current_mapping[i].value == pol_value) | |
227 | return i; | |
228 | } | |
229 | ||
85cd6da5 | 230 | return SECCLASS_NULL; |
6f5317e7 HC |
231 | } |
232 | ||
c6d3aaa4 SS |
233 | static void map_decision(u16 tclass, struct av_decision *avd, |
234 | int allow_unknown) | |
235 | { | |
236 | if (tclass < current_mapping_size) { | |
237 | unsigned i, n = current_mapping[tclass].num_perms; | |
238 | u32 result; | |
239 | ||
240 | for (i = 0, result = 0; i < n; i++) { | |
241 | if (avd->allowed & current_mapping[tclass].perms[i]) | |
242 | result |= 1<<i; | |
243 | if (allow_unknown && !current_mapping[tclass].perms[i]) | |
244 | result |= 1<<i; | |
245 | } | |
246 | avd->allowed = result; | |
247 | ||
248 | for (i = 0, result = 0; i < n; i++) | |
249 | if (avd->auditallow & current_mapping[tclass].perms[i]) | |
250 | result |= 1<<i; | |
251 | avd->auditallow = result; | |
252 | ||
253 | for (i = 0, result = 0; i < n; i++) { | |
254 | if (avd->auditdeny & current_mapping[tclass].perms[i]) | |
255 | result |= 1<<i; | |
256 | if (!allow_unknown && !current_mapping[tclass].perms[i]) | |
257 | result |= 1<<i; | |
258 | } | |
0bce9527 EP |
259 | /* |
260 | * In case the kernel has a bug and requests a permission | |
261 | * between num_perms and the maximum permission number, we | |
262 | * should audit that denial | |
263 | */ | |
264 | for (; i < (sizeof(u32)*8); i++) | |
265 | result |= 1<<i; | |
c6d3aaa4 SS |
266 | avd->auditdeny = result; |
267 | } | |
268 | } | |
269 | ||
0719aaf5 GT |
270 | int security_mls_enabled(void) |
271 | { | |
272 | return policydb.mls_enabled; | |
273 | } | |
c6d3aaa4 | 274 | |
1da177e4 LT |
275 | /* |
276 | * Return the boolean value of a constraint expression | |
277 | * when it is applied to the specified source and target | |
278 | * security contexts. | |
279 | * | |
280 | * xcontext is a special beast... It is used by the validatetrans rules | |
281 | * only. For these rules, scontext is the context before the transition, | |
282 | * tcontext is the context after the transition, and xcontext is the context | |
283 | * of the process performing the transition. All other callers of | |
284 | * constraint_expr_eval should pass in NULL for xcontext. | |
285 | */ | |
286 | static int constraint_expr_eval(struct context *scontext, | |
287 | struct context *tcontext, | |
288 | struct context *xcontext, | |
289 | struct constraint_expr *cexpr) | |
290 | { | |
291 | u32 val1, val2; | |
292 | struct context *c; | |
293 | struct role_datum *r1, *r2; | |
294 | struct mls_level *l1, *l2; | |
295 | struct constraint_expr *e; | |
296 | int s[CEXPR_MAXDEPTH]; | |
297 | int sp = -1; | |
298 | ||
299 | for (e = cexpr; e; e = e->next) { | |
300 | switch (e->expr_type) { | |
301 | case CEXPR_NOT: | |
302 | BUG_ON(sp < 0); | |
303 | s[sp] = !s[sp]; | |
304 | break; | |
305 | case CEXPR_AND: | |
306 | BUG_ON(sp < 1); | |
307 | sp--; | |
c1a7368a | 308 | s[sp] &= s[sp + 1]; |
1da177e4 LT |
309 | break; |
310 | case CEXPR_OR: | |
311 | BUG_ON(sp < 1); | |
312 | sp--; | |
c1a7368a | 313 | s[sp] |= s[sp + 1]; |
1da177e4 LT |
314 | break; |
315 | case CEXPR_ATTR: | |
c1a7368a | 316 | if (sp == (CEXPR_MAXDEPTH - 1)) |
1da177e4 LT |
317 | return 0; |
318 | switch (e->attr) { | |
319 | case CEXPR_USER: | |
320 | val1 = scontext->user; | |
321 | val2 = tcontext->user; | |
322 | break; | |
323 | case CEXPR_TYPE: | |
324 | val1 = scontext->type; | |
325 | val2 = tcontext->type; | |
326 | break; | |
327 | case CEXPR_ROLE: | |
328 | val1 = scontext->role; | |
329 | val2 = tcontext->role; | |
330 | r1 = policydb.role_val_to_struct[val1 - 1]; | |
331 | r2 = policydb.role_val_to_struct[val2 - 1]; | |
332 | switch (e->op) { | |
333 | case CEXPR_DOM: | |
334 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
335 | val2 - 1); | |
336 | continue; | |
337 | case CEXPR_DOMBY: | |
338 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
339 | val1 - 1); | |
340 | continue; | |
341 | case CEXPR_INCOMP: | |
5d55a345 EP |
342 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
343 | val2 - 1) && | |
344 | !ebitmap_get_bit(&r2->dominates, | |
345 | val1 - 1)); | |
1da177e4 LT |
346 | continue; |
347 | default: | |
348 | break; | |
349 | } | |
350 | break; | |
351 | case CEXPR_L1L2: | |
352 | l1 = &(scontext->range.level[0]); | |
353 | l2 = &(tcontext->range.level[0]); | |
354 | goto mls_ops; | |
355 | case CEXPR_L1H2: | |
356 | l1 = &(scontext->range.level[0]); | |
357 | l2 = &(tcontext->range.level[1]); | |
358 | goto mls_ops; | |
359 | case CEXPR_H1L2: | |
360 | l1 = &(scontext->range.level[1]); | |
361 | l2 = &(tcontext->range.level[0]); | |
362 | goto mls_ops; | |
363 | case CEXPR_H1H2: | |
364 | l1 = &(scontext->range.level[1]); | |
365 | l2 = &(tcontext->range.level[1]); | |
366 | goto mls_ops; | |
367 | case CEXPR_L1H1: | |
368 | l1 = &(scontext->range.level[0]); | |
369 | l2 = &(scontext->range.level[1]); | |
370 | goto mls_ops; | |
371 | case CEXPR_L2H2: | |
372 | l1 = &(tcontext->range.level[0]); | |
373 | l2 = &(tcontext->range.level[1]); | |
374 | goto mls_ops; | |
375 | mls_ops: | |
376 | switch (e->op) { | |
377 | case CEXPR_EQ: | |
378 | s[++sp] = mls_level_eq(l1, l2); | |
379 | continue; | |
380 | case CEXPR_NEQ: | |
381 | s[++sp] = !mls_level_eq(l1, l2); | |
382 | continue; | |
383 | case CEXPR_DOM: | |
384 | s[++sp] = mls_level_dom(l1, l2); | |
385 | continue; | |
386 | case CEXPR_DOMBY: | |
387 | s[++sp] = mls_level_dom(l2, l1); | |
388 | continue; | |
389 | case CEXPR_INCOMP: | |
390 | s[++sp] = mls_level_incomp(l2, l1); | |
391 | continue; | |
392 | default: | |
393 | BUG(); | |
394 | return 0; | |
395 | } | |
396 | break; | |
397 | default: | |
398 | BUG(); | |
399 | return 0; | |
400 | } | |
401 | ||
402 | switch (e->op) { | |
403 | case CEXPR_EQ: | |
404 | s[++sp] = (val1 == val2); | |
405 | break; | |
406 | case CEXPR_NEQ: | |
407 | s[++sp] = (val1 != val2); | |
408 | break; | |
409 | default: | |
410 | BUG(); | |
411 | return 0; | |
412 | } | |
413 | break; | |
414 | case CEXPR_NAMES: | |
415 | if (sp == (CEXPR_MAXDEPTH-1)) | |
416 | return 0; | |
417 | c = scontext; | |
418 | if (e->attr & CEXPR_TARGET) | |
419 | c = tcontext; | |
420 | else if (e->attr & CEXPR_XTARGET) { | |
421 | c = xcontext; | |
422 | if (!c) { | |
423 | BUG(); | |
424 | return 0; | |
425 | } | |
426 | } | |
427 | if (e->attr & CEXPR_USER) | |
428 | val1 = c->user; | |
429 | else if (e->attr & CEXPR_ROLE) | |
430 | val1 = c->role; | |
431 | else if (e->attr & CEXPR_TYPE) | |
432 | val1 = c->type; | |
433 | else { | |
434 | BUG(); | |
435 | return 0; | |
436 | } | |
437 | ||
438 | switch (e->op) { | |
439 | case CEXPR_EQ: | |
440 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
441 | break; | |
442 | case CEXPR_NEQ: | |
443 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
444 | break; | |
445 | default: | |
446 | BUG(); | |
447 | return 0; | |
448 | } | |
449 | break; | |
450 | default: | |
451 | BUG(); | |
452 | return 0; | |
453 | } | |
454 | } | |
455 | ||
456 | BUG_ON(sp != 0); | |
457 | return s[0]; | |
458 | } | |
459 | ||
44c2d9bd KK |
460 | /* |
461 | * security_dump_masked_av - dumps masked permissions during | |
462 | * security_compute_av due to RBAC, MLS/Constraint and Type bounds. | |
463 | */ | |
464 | static int dump_masked_av_helper(void *k, void *d, void *args) | |
465 | { | |
466 | struct perm_datum *pdatum = d; | |
467 | char **permission_names = args; | |
468 | ||
469 | BUG_ON(pdatum->value < 1 || pdatum->value > 32); | |
470 | ||
471 | permission_names[pdatum->value - 1] = (char *)k; | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | static void security_dump_masked_av(struct context *scontext, | |
477 | struct context *tcontext, | |
478 | u16 tclass, | |
479 | u32 permissions, | |
480 | const char *reason) | |
481 | { | |
482 | struct common_datum *common_dat; | |
483 | struct class_datum *tclass_dat; | |
484 | struct audit_buffer *ab; | |
485 | char *tclass_name; | |
486 | char *scontext_name = NULL; | |
487 | char *tcontext_name = NULL; | |
488 | char *permission_names[32]; | |
2da5d31b JM |
489 | int index; |
490 | u32 length; | |
44c2d9bd KK |
491 | bool need_comma = false; |
492 | ||
493 | if (!permissions) | |
494 | return; | |
495 | ||
ac76c05b | 496 | tclass_name = sym_name(&policydb, SYM_CLASSES, tclass - 1); |
44c2d9bd KK |
497 | tclass_dat = policydb.class_val_to_struct[tclass - 1]; |
498 | common_dat = tclass_dat->comdatum; | |
499 | ||
500 | /* init permission_names */ | |
501 | if (common_dat && | |
502 | hashtab_map(common_dat->permissions.table, | |
503 | dump_masked_av_helper, permission_names) < 0) | |
504 | goto out; | |
505 | ||
506 | if (hashtab_map(tclass_dat->permissions.table, | |
507 | dump_masked_av_helper, permission_names) < 0) | |
508 | goto out; | |
509 | ||
510 | /* get scontext/tcontext in text form */ | |
511 | if (context_struct_to_string(scontext, | |
512 | &scontext_name, &length) < 0) | |
513 | goto out; | |
514 | ||
515 | if (context_struct_to_string(tcontext, | |
516 | &tcontext_name, &length) < 0) | |
517 | goto out; | |
518 | ||
519 | /* audit a message */ | |
520 | ab = audit_log_start(current->audit_context, | |
521 | GFP_ATOMIC, AUDIT_SELINUX_ERR); | |
522 | if (!ab) | |
523 | goto out; | |
524 | ||
525 | audit_log_format(ab, "op=security_compute_av reason=%s " | |
526 | "scontext=%s tcontext=%s tclass=%s perms=", | |
527 | reason, scontext_name, tcontext_name, tclass_name); | |
528 | ||
529 | for (index = 0; index < 32; index++) { | |
530 | u32 mask = (1 << index); | |
531 | ||
532 | if ((mask & permissions) == 0) | |
533 | continue; | |
534 | ||
535 | audit_log_format(ab, "%s%s", | |
536 | need_comma ? "," : "", | |
537 | permission_names[index] | |
538 | ? permission_names[index] : "????"); | |
539 | need_comma = true; | |
540 | } | |
541 | audit_log_end(ab); | |
542 | out: | |
543 | /* release scontext/tcontext */ | |
544 | kfree(tcontext_name); | |
545 | kfree(scontext_name); | |
546 | ||
547 | return; | |
548 | } | |
549 | ||
d9250dea KK |
550 | /* |
551 | * security_boundary_permission - drops violated permissions | |
552 | * on boundary constraint. | |
553 | */ | |
554 | static void type_attribute_bounds_av(struct context *scontext, | |
555 | struct context *tcontext, | |
556 | u16 tclass, | |
d9250dea KK |
557 | struct av_decision *avd) |
558 | { | |
2ae3ba39 | 559 | struct context lo_scontext; |
7ea59202 | 560 | struct context lo_tcontext, *tcontextp = tcontext; |
2ae3ba39 | 561 | struct av_decision lo_avd; |
23bdecb0 EP |
562 | struct type_datum *source; |
563 | struct type_datum *target; | |
2ae3ba39 | 564 | u32 masked = 0; |
d9250dea | 565 | |
23bdecb0 EP |
566 | source = flex_array_get_ptr(policydb.type_val_to_struct_array, |
567 | scontext->type - 1); | |
568 | BUG_ON(!source); | |
569 | ||
7ea59202 SS |
570 | if (!source->bounds) |
571 | return; | |
572 | ||
23bdecb0 EP |
573 | target = flex_array_get_ptr(policydb.type_val_to_struct_array, |
574 | tcontext->type - 1); | |
575 | BUG_ON(!target); | |
576 | ||
7ea59202 | 577 | memset(&lo_avd, 0, sizeof(lo_avd)); |
d9250dea | 578 | |
7ea59202 SS |
579 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); |
580 | lo_scontext.type = source->bounds; | |
2ae3ba39 KK |
581 | |
582 | if (target->bounds) { | |
2ae3ba39 KK |
583 | memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); |
584 | lo_tcontext.type = target->bounds; | |
7ea59202 | 585 | tcontextp = &lo_tcontext; |
2ae3ba39 KK |
586 | } |
587 | ||
7ea59202 SS |
588 | context_struct_compute_av(&lo_scontext, |
589 | tcontextp, | |
590 | tclass, | |
591 | &lo_avd, | |
592 | NULL); | |
2ae3ba39 | 593 | |
7ea59202 | 594 | masked = ~lo_avd.allowed & avd->allowed; |
d9250dea | 595 | |
7ea59202 SS |
596 | if (likely(!masked)) |
597 | return; /* no masked permission */ | |
d9250dea | 598 | |
7ea59202 SS |
599 | /* mask violated permissions */ |
600 | avd->allowed &= ~masked; | |
601 | ||
602 | /* audit masked permissions */ | |
603 | security_dump_masked_av(scontext, tcontext, | |
604 | tclass, masked, "bounds"); | |
d9250dea KK |
605 | } |
606 | ||
1da177e4 | 607 | /* |
fa1aa143 JVS |
608 | * flag which drivers have permissions |
609 | * only looking for ioctl based extended permssions | |
610 | */ | |
611 | void services_compute_xperms_drivers( | |
612 | struct extended_perms *xperms, | |
613 | struct avtab_node *node) | |
614 | { | |
615 | unsigned int i; | |
616 | ||
617 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
618 | /* if one or more driver has all permissions allowed */ | |
619 | for (i = 0; i < ARRAY_SIZE(xperms->drivers.p); i++) | |
620 | xperms->drivers.p[i] |= node->datum.u.xperms->perms.p[i]; | |
621 | } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
622 | /* if allowing permissions within a driver */ | |
623 | security_xperm_set(xperms->drivers.p, | |
624 | node->datum.u.xperms->driver); | |
625 | } | |
626 | ||
627 | /* If no ioctl commands are allowed, ignore auditallow and auditdeny */ | |
628 | if (node->key.specified & AVTAB_XPERMS_ALLOWED) | |
629 | xperms->len = 1; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Compute access vectors and extended permissions based on a context | |
634 | * structure pair for the permissions in a particular class. | |
1da177e4 | 635 | */ |
19439d05 | 636 | static void context_struct_compute_av(struct context *scontext, |
fa1aa143 JVS |
637 | struct context *tcontext, |
638 | u16 tclass, | |
639 | struct av_decision *avd, | |
640 | struct extended_perms *xperms) | |
1da177e4 LT |
641 | { |
642 | struct constraint_node *constraint; | |
643 | struct role_allow *ra; | |
644 | struct avtab_key avkey; | |
782ebb99 | 645 | struct avtab_node *node; |
1da177e4 | 646 | struct class_datum *tclass_datum; |
782ebb99 SS |
647 | struct ebitmap *sattr, *tattr; |
648 | struct ebitmap_node *snode, *tnode; | |
649 | unsigned int i, j; | |
1da177e4 | 650 | |
1da177e4 | 651 | avd->allowed = 0; |
1da177e4 LT |
652 | avd->auditallow = 0; |
653 | avd->auditdeny = 0xffffffff; | |
fa1aa143 JVS |
654 | if (xperms) { |
655 | memset(&xperms->drivers, 0, sizeof(xperms->drivers)); | |
656 | xperms->len = 0; | |
657 | } | |
1da177e4 | 658 | |
c6d3aaa4 SS |
659 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { |
660 | if (printk_ratelimit()) | |
661 | printk(KERN_WARNING "SELinux: Invalid class %hu\n", tclass); | |
19439d05 | 662 | return; |
c6d3aaa4 | 663 | } |
3f12070e EP |
664 | |
665 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
666 | ||
1da177e4 LT |
667 | /* |
668 | * If a specific type enforcement rule was defined for | |
669 | * this permission check, then use it. | |
670 | */ | |
1da177e4 | 671 | avkey.target_class = tclass; |
fa1aa143 | 672 | avkey.specified = AVTAB_AV | AVTAB_XPERMS; |
6371dcd3 EP |
673 | sattr = flex_array_get(policydb.type_attr_map_array, scontext->type - 1); |
674 | BUG_ON(!sattr); | |
675 | tattr = flex_array_get(policydb.type_attr_map_array, tcontext->type - 1); | |
676 | BUG_ON(!tattr); | |
9fe79ad1 KK |
677 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
678 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
679 | avkey.source_type = i + 1; |
680 | avkey.target_type = j + 1; | |
681 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
dbc74c65 | 682 | node; |
782ebb99 SS |
683 | node = avtab_search_node_next(node, avkey.specified)) { |
684 | if (node->key.specified == AVTAB_ALLOWED) | |
fa1aa143 | 685 | avd->allowed |= node->datum.u.data; |
782ebb99 | 686 | else if (node->key.specified == AVTAB_AUDITALLOW) |
fa1aa143 | 687 | avd->auditallow |= node->datum.u.data; |
782ebb99 | 688 | else if (node->key.specified == AVTAB_AUDITDENY) |
fa1aa143 JVS |
689 | avd->auditdeny &= node->datum.u.data; |
690 | else if (xperms && (node->key.specified & AVTAB_XPERMS)) | |
691 | services_compute_xperms_drivers(xperms, node); | |
782ebb99 | 692 | } |
1da177e4 | 693 | |
782ebb99 | 694 | /* Check conditional av table for additional permissions */ |
fa1aa143 JVS |
695 | cond_compute_av(&policydb.te_cond_avtab, &avkey, |
696 | avd, xperms); | |
782ebb99 SS |
697 | |
698 | } | |
699 | } | |
1da177e4 LT |
700 | |
701 | /* | |
702 | * Remove any permissions prohibited by a constraint (this includes | |
703 | * the MLS policy). | |
704 | */ | |
705 | constraint = tclass_datum->constraints; | |
706 | while (constraint) { | |
707 | if ((constraint->permissions & (avd->allowed)) && | |
708 | !constraint_expr_eval(scontext, tcontext, NULL, | |
709 | constraint->expr)) { | |
caabbdc0 | 710 | avd->allowed &= ~(constraint->permissions); |
1da177e4 LT |
711 | } |
712 | constraint = constraint->next; | |
713 | } | |
714 | ||
715 | /* | |
716 | * If checking process transition permission and the | |
717 | * role is changing, then check the (current_role, new_role) | |
718 | * pair. | |
719 | */ | |
c6d3aaa4 SS |
720 | if (tclass == policydb.process_class && |
721 | (avd->allowed & policydb.process_trans_perms) && | |
1da177e4 LT |
722 | scontext->role != tcontext->role) { |
723 | for (ra = policydb.role_allow; ra; ra = ra->next) { | |
724 | if (scontext->role == ra->role && | |
725 | tcontext->role == ra->new_role) | |
726 | break; | |
727 | } | |
728 | if (!ra) | |
c6d3aaa4 | 729 | avd->allowed &= ~policydb.process_trans_perms; |
1da177e4 LT |
730 | } |
731 | ||
d9250dea KK |
732 | /* |
733 | * If the given source and target types have boundary | |
734 | * constraint, lazy checks have to mask any violated | |
735 | * permission and notice it to userspace via audit. | |
736 | */ | |
737 | type_attribute_bounds_av(scontext, tcontext, | |
19439d05 | 738 | tclass, avd); |
1da177e4 LT |
739 | } |
740 | ||
741 | static int security_validtrans_handle_fail(struct context *ocontext, | |
5d55a345 EP |
742 | struct context *ncontext, |
743 | struct context *tcontext, | |
744 | u16 tclass) | |
1da177e4 LT |
745 | { |
746 | char *o = NULL, *n = NULL, *t = NULL; | |
747 | u32 olen, nlen, tlen; | |
748 | ||
4b02b524 | 749 | if (context_struct_to_string(ocontext, &o, &olen)) |
1da177e4 | 750 | goto out; |
4b02b524 | 751 | if (context_struct_to_string(ncontext, &n, &nlen)) |
1da177e4 | 752 | goto out; |
4b02b524 | 753 | if (context_struct_to_string(tcontext, &t, &tlen)) |
1da177e4 | 754 | goto out; |
9ad9ad38 | 755 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
4093a844 | 756 | "op=security_validate_transition seresult=denied" |
5d55a345 | 757 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", |
ac76c05b | 758 | o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); |
1da177e4 LT |
759 | out: |
760 | kfree(o); | |
761 | kfree(n); | |
762 | kfree(t); | |
763 | ||
764 | if (!selinux_enforcing) | |
765 | return 0; | |
766 | return -EPERM; | |
767 | } | |
768 | ||
f9df6458 AP |
769 | static int security_compute_validatetrans(u32 oldsid, u32 newsid, u32 tasksid, |
770 | u16 orig_tclass, bool user) | |
1da177e4 LT |
771 | { |
772 | struct context *ocontext; | |
773 | struct context *ncontext; | |
774 | struct context *tcontext; | |
775 | struct class_datum *tclass_datum; | |
776 | struct constraint_node *constraint; | |
c6d3aaa4 | 777 | u16 tclass; |
1da177e4 LT |
778 | int rc = 0; |
779 | ||
780 | if (!ss_initialized) | |
781 | return 0; | |
782 | ||
0804d113 | 783 | read_lock(&policy_rwlock); |
1da177e4 | 784 | |
f9df6458 AP |
785 | if (!user) |
786 | tclass = unmap_class(orig_tclass); | |
787 | else | |
788 | tclass = orig_tclass; | |
c6d3aaa4 | 789 | |
1da177e4 | 790 | if (!tclass || tclass > policydb.p_classes.nprim) { |
1da177e4 LT |
791 | rc = -EINVAL; |
792 | goto out; | |
793 | } | |
794 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; | |
795 | ||
796 | ocontext = sidtab_search(&sidtab, oldsid); | |
797 | if (!ocontext) { | |
744ba35e EP |
798 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
799 | __func__, oldsid); | |
1da177e4 LT |
800 | rc = -EINVAL; |
801 | goto out; | |
802 | } | |
803 | ||
804 | ncontext = sidtab_search(&sidtab, newsid); | |
805 | if (!ncontext) { | |
744ba35e EP |
806 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
807 | __func__, newsid); | |
1da177e4 LT |
808 | rc = -EINVAL; |
809 | goto out; | |
810 | } | |
811 | ||
812 | tcontext = sidtab_search(&sidtab, tasksid); | |
813 | if (!tcontext) { | |
744ba35e EP |
814 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
815 | __func__, tasksid); | |
1da177e4 LT |
816 | rc = -EINVAL; |
817 | goto out; | |
818 | } | |
819 | ||
820 | constraint = tclass_datum->validatetrans; | |
821 | while (constraint) { | |
822 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, | |
5d55a345 | 823 | constraint->expr)) { |
f9df6458 AP |
824 | if (user) |
825 | rc = -EPERM; | |
826 | else | |
827 | rc = security_validtrans_handle_fail(ocontext, | |
828 | ncontext, | |
829 | tcontext, | |
830 | tclass); | |
1da177e4 LT |
831 | goto out; |
832 | } | |
833 | constraint = constraint->next; | |
834 | } | |
835 | ||
836 | out: | |
0804d113 | 837 | read_unlock(&policy_rwlock); |
1da177e4 LT |
838 | return rc; |
839 | } | |
840 | ||
f9df6458 AP |
841 | int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid, |
842 | u16 tclass) | |
843 | { | |
844 | return security_compute_validatetrans(oldsid, newsid, tasksid, | |
845 | tclass, true); | |
846 | } | |
847 | ||
848 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, | |
849 | u16 orig_tclass) | |
850 | { | |
851 | return security_compute_validatetrans(oldsid, newsid, tasksid, | |
852 | orig_tclass, false); | |
853 | } | |
854 | ||
d9250dea KK |
855 | /* |
856 | * security_bounded_transition - check whether the given | |
857 | * transition is directed to bounded, or not. | |
858 | * It returns 0, if @newsid is bounded by @oldsid. | |
859 | * Otherwise, it returns error code. | |
860 | * | |
861 | * @oldsid : current security identifier | |
862 | * @newsid : destinated security identifier | |
863 | */ | |
864 | int security_bounded_transition(u32 old_sid, u32 new_sid) | |
865 | { | |
866 | struct context *old_context, *new_context; | |
867 | struct type_datum *type; | |
868 | int index; | |
4b02b524 | 869 | int rc; |
d9250dea | 870 | |
a72ddf7c PM |
871 | if (!ss_initialized) |
872 | return 0; | |
873 | ||
d9250dea KK |
874 | read_lock(&policy_rwlock); |
875 | ||
4b02b524 | 876 | rc = -EINVAL; |
d9250dea KK |
877 | old_context = sidtab_search(&sidtab, old_sid); |
878 | if (!old_context) { | |
879 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
880 | __func__, old_sid); | |
881 | goto out; | |
882 | } | |
883 | ||
4b02b524 | 884 | rc = -EINVAL; |
d9250dea KK |
885 | new_context = sidtab_search(&sidtab, new_sid); |
886 | if (!new_context) { | |
887 | printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", | |
888 | __func__, new_sid); | |
889 | goto out; | |
890 | } | |
891 | ||
4b02b524 | 892 | rc = 0; |
af901ca1 | 893 | /* type/domain unchanged */ |
4b02b524 | 894 | if (old_context->type == new_context->type) |
d9250dea | 895 | goto out; |
d9250dea KK |
896 | |
897 | index = new_context->type; | |
898 | while (true) { | |
23bdecb0 EP |
899 | type = flex_array_get_ptr(policydb.type_val_to_struct_array, |
900 | index - 1); | |
d9250dea KK |
901 | BUG_ON(!type); |
902 | ||
903 | /* not bounded anymore */ | |
4b02b524 EP |
904 | rc = -EPERM; |
905 | if (!type->bounds) | |
d9250dea | 906 | break; |
d9250dea KK |
907 | |
908 | /* @newsid is bounded by @oldsid */ | |
4b02b524 EP |
909 | rc = 0; |
910 | if (type->bounds == old_context->type) | |
d9250dea | 911 | break; |
4b02b524 | 912 | |
d9250dea KK |
913 | index = type->bounds; |
914 | } | |
44c2d9bd KK |
915 | |
916 | if (rc) { | |
917 | char *old_name = NULL; | |
918 | char *new_name = NULL; | |
2da5d31b | 919 | u32 length; |
44c2d9bd KK |
920 | |
921 | if (!context_struct_to_string(old_context, | |
922 | &old_name, &length) && | |
923 | !context_struct_to_string(new_context, | |
924 | &new_name, &length)) { | |
925 | audit_log(current->audit_context, | |
926 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
927 | "op=security_bounded_transition " | |
4093a844 | 928 | "seresult=denied " |
44c2d9bd KK |
929 | "oldcontext=%s newcontext=%s", |
930 | old_name, new_name); | |
931 | } | |
932 | kfree(new_name); | |
933 | kfree(old_name); | |
934 | } | |
d9250dea KK |
935 | out: |
936 | read_unlock(&policy_rwlock); | |
937 | ||
938 | return rc; | |
939 | } | |
940 | ||
19439d05 | 941 | static void avd_init(struct av_decision *avd) |
c6d3aaa4 | 942 | { |
19439d05 SS |
943 | avd->allowed = 0; |
944 | avd->auditallow = 0; | |
945 | avd->auditdeny = 0xffffffff; | |
946 | avd->seqno = latest_granting; | |
947 | avd->flags = 0; | |
c6d3aaa4 SS |
948 | } |
949 | ||
fa1aa143 JVS |
950 | void services_compute_xperms_decision(struct extended_perms_decision *xpermd, |
951 | struct avtab_node *node) | |
952 | { | |
953 | unsigned int i; | |
954 | ||
955 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
956 | if (xpermd->driver != node->datum.u.xperms->driver) | |
957 | return; | |
958 | } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
959 | if (!security_xperm_test(node->datum.u.xperms->perms.p, | |
960 | xpermd->driver)) | |
961 | return; | |
962 | } else { | |
963 | BUG(); | |
964 | } | |
965 | ||
966 | if (node->key.specified == AVTAB_XPERMS_ALLOWED) { | |
967 | xpermd->used |= XPERMS_ALLOWED; | |
968 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
969 | memset(xpermd->allowed->p, 0xff, | |
970 | sizeof(xpermd->allowed->p)); | |
971 | } | |
972 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
973 | for (i = 0; i < ARRAY_SIZE(xpermd->allowed->p); i++) | |
974 | xpermd->allowed->p[i] |= | |
975 | node->datum.u.xperms->perms.p[i]; | |
976 | } | |
977 | } else if (node->key.specified == AVTAB_XPERMS_AUDITALLOW) { | |
978 | xpermd->used |= XPERMS_AUDITALLOW; | |
979 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
980 | memset(xpermd->auditallow->p, 0xff, | |
981 | sizeof(xpermd->auditallow->p)); | |
982 | } | |
983 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
984 | for (i = 0; i < ARRAY_SIZE(xpermd->auditallow->p); i++) | |
985 | xpermd->auditallow->p[i] |= | |
986 | node->datum.u.xperms->perms.p[i]; | |
987 | } | |
988 | } else if (node->key.specified == AVTAB_XPERMS_DONTAUDIT) { | |
989 | xpermd->used |= XPERMS_DONTAUDIT; | |
990 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
991 | memset(xpermd->dontaudit->p, 0xff, | |
992 | sizeof(xpermd->dontaudit->p)); | |
993 | } | |
994 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
995 | for (i = 0; i < ARRAY_SIZE(xpermd->dontaudit->p); i++) | |
996 | xpermd->dontaudit->p[i] |= | |
997 | node->datum.u.xperms->perms.p[i]; | |
998 | } | |
999 | } else { | |
1000 | BUG(); | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | void security_compute_xperms_decision(u32 ssid, | |
1005 | u32 tsid, | |
1006 | u16 orig_tclass, | |
1007 | u8 driver, | |
1008 | struct extended_perms_decision *xpermd) | |
1009 | { | |
1010 | u16 tclass; | |
1011 | struct context *scontext, *tcontext; | |
1012 | struct avtab_key avkey; | |
1013 | struct avtab_node *node; | |
1014 | struct ebitmap *sattr, *tattr; | |
1015 | struct ebitmap_node *snode, *tnode; | |
1016 | unsigned int i, j; | |
1017 | ||
1018 | xpermd->driver = driver; | |
1019 | xpermd->used = 0; | |
1020 | memset(xpermd->allowed->p, 0, sizeof(xpermd->allowed->p)); | |
1021 | memset(xpermd->auditallow->p, 0, sizeof(xpermd->auditallow->p)); | |
1022 | memset(xpermd->dontaudit->p, 0, sizeof(xpermd->dontaudit->p)); | |
1023 | ||
1024 | read_lock(&policy_rwlock); | |
1025 | if (!ss_initialized) | |
1026 | goto allow; | |
1027 | ||
1028 | scontext = sidtab_search(&sidtab, ssid); | |
1029 | if (!scontext) { | |
1030 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1031 | __func__, ssid); | |
1032 | goto out; | |
1033 | } | |
1034 | ||
1035 | tcontext = sidtab_search(&sidtab, tsid); | |
1036 | if (!tcontext) { | |
1037 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1038 | __func__, tsid); | |
1039 | goto out; | |
1040 | } | |
1041 | ||
1042 | tclass = unmap_class(orig_tclass); | |
1043 | if (unlikely(orig_tclass && !tclass)) { | |
1044 | if (policydb.allow_unknown) | |
1045 | goto allow; | |
1046 | goto out; | |
1047 | } | |
1048 | ||
1049 | ||
1050 | if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) { | |
1051 | pr_warn_ratelimited("SELinux: Invalid class %hu\n", tclass); | |
1052 | goto out; | |
1053 | } | |
1054 | ||
1055 | avkey.target_class = tclass; | |
1056 | avkey.specified = AVTAB_XPERMS; | |
1057 | sattr = flex_array_get(policydb.type_attr_map_array, | |
1058 | scontext->type - 1); | |
1059 | BUG_ON(!sattr); | |
1060 | tattr = flex_array_get(policydb.type_attr_map_array, | |
1061 | tcontext->type - 1); | |
1062 | BUG_ON(!tattr); | |
1063 | ebitmap_for_each_positive_bit(sattr, snode, i) { | |
1064 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
1065 | avkey.source_type = i + 1; | |
1066 | avkey.target_type = j + 1; | |
1067 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); | |
1068 | node; | |
1069 | node = avtab_search_node_next(node, avkey.specified)) | |
1070 | services_compute_xperms_decision(xpermd, node); | |
1071 | ||
1072 | cond_compute_xperms(&policydb.te_cond_avtab, | |
1073 | &avkey, xpermd); | |
1074 | } | |
1075 | } | |
1076 | out: | |
1077 | read_unlock(&policy_rwlock); | |
1078 | return; | |
1079 | allow: | |
1080 | memset(xpermd->allowed->p, 0xff, sizeof(xpermd->allowed->p)); | |
1081 | goto out; | |
1082 | } | |
19439d05 | 1083 | |
1da177e4 LT |
1084 | /** |
1085 | * security_compute_av - Compute access vector decisions. | |
1086 | * @ssid: source security identifier | |
1087 | * @tsid: target security identifier | |
1088 | * @tclass: target security class | |
1da177e4 | 1089 | * @avd: access vector decisions |
fa1aa143 | 1090 | * @xperms: extended permissions |
1da177e4 LT |
1091 | * |
1092 | * Compute a set of access vector decisions based on the | |
1093 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
1da177e4 | 1094 | */ |
19439d05 SS |
1095 | void security_compute_av(u32 ssid, |
1096 | u32 tsid, | |
1097 | u16 orig_tclass, | |
fa1aa143 JVS |
1098 | struct av_decision *avd, |
1099 | struct extended_perms *xperms) | |
1da177e4 | 1100 | { |
c6d3aaa4 | 1101 | u16 tclass; |
19439d05 | 1102 | struct context *scontext = NULL, *tcontext = NULL; |
c6d3aaa4 | 1103 | |
b7f3008a | 1104 | read_lock(&policy_rwlock); |
19439d05 | 1105 | avd_init(avd); |
fa1aa143 | 1106 | xperms->len = 0; |
c6d3aaa4 SS |
1107 | if (!ss_initialized) |
1108 | goto allow; | |
1109 | ||
19439d05 SS |
1110 | scontext = sidtab_search(&sidtab, ssid); |
1111 | if (!scontext) { | |
1112 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1113 | __func__, ssid); | |
1114 | goto out; | |
1115 | } | |
1116 | ||
1117 | /* permissive domain? */ | |
1118 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
1119 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
1120 | ||
1121 | tcontext = sidtab_search(&sidtab, tsid); | |
1122 | if (!tcontext) { | |
1123 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1124 | __func__, tsid); | |
1125 | goto out; | |
1126 | } | |
1127 | ||
c6d3aaa4 SS |
1128 | tclass = unmap_class(orig_tclass); |
1129 | if (unlikely(orig_tclass && !tclass)) { | |
1130 | if (policydb.allow_unknown) | |
1131 | goto allow; | |
b7f3008a | 1132 | goto out; |
c6d3aaa4 | 1133 | } |
fa1aa143 | 1134 | context_struct_compute_av(scontext, tcontext, tclass, avd, xperms); |
c6d3aaa4 | 1135 | map_decision(orig_tclass, avd, policydb.allow_unknown); |
b7f3008a | 1136 | out: |
c6d3aaa4 | 1137 | read_unlock(&policy_rwlock); |
19439d05 | 1138 | return; |
c6d3aaa4 SS |
1139 | allow: |
1140 | avd->allowed = 0xffffffff; | |
b7f3008a | 1141 | goto out; |
c6d3aaa4 SS |
1142 | } |
1143 | ||
19439d05 SS |
1144 | void security_compute_av_user(u32 ssid, |
1145 | u32 tsid, | |
1146 | u16 tclass, | |
1147 | struct av_decision *avd) | |
c6d3aaa4 | 1148 | { |
19439d05 | 1149 | struct context *scontext = NULL, *tcontext = NULL; |
1da177e4 | 1150 | |
19439d05 SS |
1151 | read_lock(&policy_rwlock); |
1152 | avd_init(avd); | |
1153 | if (!ss_initialized) | |
1154 | goto allow; | |
1155 | ||
1156 | scontext = sidtab_search(&sidtab, ssid); | |
1157 | if (!scontext) { | |
1158 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1159 | __func__, ssid); | |
1160 | goto out; | |
1da177e4 LT |
1161 | } |
1162 | ||
19439d05 SS |
1163 | /* permissive domain? */ |
1164 | if (ebitmap_get_bit(&policydb.permissive_map, scontext->type)) | |
1165 | avd->flags |= AVD_FLAGS_PERMISSIVE; | |
1166 | ||
1167 | tcontext = sidtab_search(&sidtab, tsid); | |
1168 | if (!tcontext) { | |
1169 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", | |
1170 | __func__, tsid); | |
1171 | goto out; | |
1172 | } | |
1173 | ||
1174 | if (unlikely(!tclass)) { | |
1175 | if (policydb.allow_unknown) | |
1176 | goto allow; | |
1177 | goto out; | |
1178 | } | |
1179 | ||
fa1aa143 | 1180 | context_struct_compute_av(scontext, tcontext, tclass, avd, NULL); |
19439d05 | 1181 | out: |
0804d113 | 1182 | read_unlock(&policy_rwlock); |
19439d05 SS |
1183 | return; |
1184 | allow: | |
1185 | avd->allowed = 0xffffffff; | |
1186 | goto out; | |
1da177e4 LT |
1187 | } |
1188 | ||
1189 | /* | |
1190 | * Write the security context string representation of | |
1191 | * the context structure `context' into a dynamically | |
1192 | * allocated string of the correct size. Set `*scontext' | |
1193 | * to point to this string and set `*scontext_len' to | |
1194 | * the length of the string. | |
1195 | */ | |
1196 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) | |
1197 | { | |
1198 | char *scontextp; | |
1199 | ||
d5630b9d EP |
1200 | if (scontext) |
1201 | *scontext = NULL; | |
1da177e4 LT |
1202 | *scontext_len = 0; |
1203 | ||
12b29f34 SS |
1204 | if (context->len) { |
1205 | *scontext_len = context->len; | |
bb7081ab EP |
1206 | if (scontext) { |
1207 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
1208 | if (!(*scontext)) | |
1209 | return -ENOMEM; | |
1210 | } | |
12b29f34 SS |
1211 | return 0; |
1212 | } | |
1213 | ||
1da177e4 | 1214 | /* Compute the size of the context. */ |
ac76c05b EP |
1215 | *scontext_len += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + 1; |
1216 | *scontext_len += strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + 1; | |
1217 | *scontext_len += strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)) + 1; | |
1da177e4 LT |
1218 | *scontext_len += mls_compute_context_len(context); |
1219 | ||
d5630b9d EP |
1220 | if (!scontext) |
1221 | return 0; | |
1222 | ||
1da177e4 LT |
1223 | /* Allocate space for the context; caller must free this space. */ |
1224 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 1225 | if (!scontextp) |
1da177e4 | 1226 | return -ENOMEM; |
1da177e4 LT |
1227 | *scontext = scontextp; |
1228 | ||
1229 | /* | |
1230 | * Copy the user name, role name and type name into the context. | |
1231 | */ | |
9529c788 | 1232 | scontextp += sprintf(scontextp, "%s:%s:%s", |
ac76c05b EP |
1233 | sym_name(&policydb, SYM_USERS, context->user - 1), |
1234 | sym_name(&policydb, SYM_ROLES, context->role - 1), | |
1235 | sym_name(&policydb, SYM_TYPES, context->type - 1)); | |
1da177e4 LT |
1236 | |
1237 | mls_sid_to_context(context, &scontextp); | |
1238 | ||
1239 | *scontextp = 0; | |
1240 | ||
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | #include "initial_sid_to_string.h" | |
1245 | ||
f0ee2e46 JC |
1246 | const char *security_get_initial_sid_context(u32 sid) |
1247 | { | |
1248 | if (unlikely(sid > SECINITSID_NUM)) | |
1249 | return NULL; | |
1250 | return initial_sid_to_string[sid]; | |
1251 | } | |
1252 | ||
12b29f34 SS |
1253 | static int security_sid_to_context_core(u32 sid, char **scontext, |
1254 | u32 *scontext_len, int force) | |
1da177e4 LT |
1255 | { |
1256 | struct context *context; | |
1257 | int rc = 0; | |
1258 | ||
d5630b9d EP |
1259 | if (scontext) |
1260 | *scontext = NULL; | |
4f4acf3a SS |
1261 | *scontext_len = 0; |
1262 | ||
1da177e4 LT |
1263 | if (!ss_initialized) { |
1264 | if (sid <= SECINITSID_NUM) { | |
1265 | char *scontextp; | |
1266 | ||
1267 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
d5630b9d EP |
1268 | if (!scontext) |
1269 | goto out; | |
aa736c36 RV |
1270 | scontextp = kmemdup(initial_sid_to_string[sid], |
1271 | *scontext_len, GFP_ATOMIC); | |
0cccca06 SH |
1272 | if (!scontextp) { |
1273 | rc = -ENOMEM; | |
1274 | goto out; | |
1275 | } | |
1da177e4 LT |
1276 | *scontext = scontextp; |
1277 | goto out; | |
1278 | } | |
744ba35e EP |
1279 | printk(KERN_ERR "SELinux: %s: called before initial " |
1280 | "load_policy on unknown SID %d\n", __func__, sid); | |
1da177e4 LT |
1281 | rc = -EINVAL; |
1282 | goto out; | |
1283 | } | |
0804d113 | 1284 | read_lock(&policy_rwlock); |
12b29f34 SS |
1285 | if (force) |
1286 | context = sidtab_search_force(&sidtab, sid); | |
1287 | else | |
1288 | context = sidtab_search(&sidtab, sid); | |
1da177e4 | 1289 | if (!context) { |
744ba35e EP |
1290 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1291 | __func__, sid); | |
1da177e4 LT |
1292 | rc = -EINVAL; |
1293 | goto out_unlock; | |
1294 | } | |
1295 | rc = context_struct_to_string(context, scontext, scontext_len); | |
1296 | out_unlock: | |
0804d113 | 1297 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1298 | out: |
1299 | return rc; | |
1300 | ||
1301 | } | |
1302 | ||
12b29f34 SS |
1303 | /** |
1304 | * security_sid_to_context - Obtain a context for a given SID. | |
1305 | * @sid: security identifier, SID | |
1306 | * @scontext: security context | |
1307 | * @scontext_len: length in bytes | |
1308 | * | |
1309 | * Write the string representation of the context associated with @sid | |
1310 | * into a dynamically allocated string of the correct size. Set @scontext | |
1311 | * to point to this string and set @scontext_len to the length of the string. | |
1312 | */ | |
1313 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 1314 | { |
12b29f34 SS |
1315 | return security_sid_to_context_core(sid, scontext, scontext_len, 0); |
1316 | } | |
1317 | ||
1318 | int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len) | |
1319 | { | |
1320 | return security_sid_to_context_core(sid, scontext, scontext_len, 1); | |
1321 | } | |
1322 | ||
9a59daa0 SS |
1323 | /* |
1324 | * Caveat: Mutates scontext. | |
1325 | */ | |
12b29f34 SS |
1326 | static int string_to_context_struct(struct policydb *pol, |
1327 | struct sidtab *sidtabp, | |
9a59daa0 | 1328 | char *scontext, |
12b29f34 SS |
1329 | u32 scontext_len, |
1330 | struct context *ctx, | |
9a59daa0 | 1331 | u32 def_sid) |
12b29f34 | 1332 | { |
1da177e4 LT |
1333 | struct role_datum *role; |
1334 | struct type_datum *typdatum; | |
1335 | struct user_datum *usrdatum; | |
1336 | char *scontextp, *p, oldc; | |
1337 | int rc = 0; | |
1338 | ||
12b29f34 | 1339 | context_init(ctx); |
1da177e4 | 1340 | |
1da177e4 LT |
1341 | /* Parse the security context. */ |
1342 | ||
1343 | rc = -EINVAL; | |
9a59daa0 | 1344 | scontextp = (char *) scontext; |
1da177e4 LT |
1345 | |
1346 | /* Extract the user. */ | |
1347 | p = scontextp; | |
1348 | while (*p && *p != ':') | |
1349 | p++; | |
1350 | ||
1351 | if (*p == 0) | |
12b29f34 | 1352 | goto out; |
1da177e4 LT |
1353 | |
1354 | *p++ = 0; | |
1355 | ||
12b29f34 | 1356 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1357 | if (!usrdatum) |
12b29f34 | 1358 | goto out; |
1da177e4 | 1359 | |
12b29f34 | 1360 | ctx->user = usrdatum->value; |
1da177e4 LT |
1361 | |
1362 | /* Extract role. */ | |
1363 | scontextp = p; | |
1364 | while (*p && *p != ':') | |
1365 | p++; | |
1366 | ||
1367 | if (*p == 0) | |
12b29f34 | 1368 | goto out; |
1da177e4 LT |
1369 | |
1370 | *p++ = 0; | |
1371 | ||
12b29f34 | 1372 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1373 | if (!role) |
12b29f34 SS |
1374 | goto out; |
1375 | ctx->role = role->value; | |
1da177e4 LT |
1376 | |
1377 | /* Extract type. */ | |
1378 | scontextp = p; | |
1379 | while (*p && *p != ':') | |
1380 | p++; | |
1381 | oldc = *p; | |
1382 | *p++ = 0; | |
1383 | ||
12b29f34 | 1384 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1385 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1386 | goto out; |
1da177e4 | 1387 | |
12b29f34 | 1388 | ctx->type = typdatum->value; |
1da177e4 | 1389 | |
12b29f34 | 1390 | rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid); |
1da177e4 | 1391 | if (rc) |
12b29f34 | 1392 | goto out; |
1da177e4 | 1393 | |
4b02b524 EP |
1394 | rc = -EINVAL; |
1395 | if ((p - scontext) < scontext_len) | |
12b29f34 | 1396 | goto out; |
1da177e4 LT |
1397 | |
1398 | /* Check the validity of the new context. */ | |
4b02b524 | 1399 | if (!policydb_context_isvalid(pol, ctx)) |
12b29f34 | 1400 | goto out; |
12b29f34 SS |
1401 | rc = 0; |
1402 | out: | |
8e531af9 EP |
1403 | if (rc) |
1404 | context_destroy(ctx); | |
12b29f34 SS |
1405 | return rc; |
1406 | } | |
1407 | ||
1408 | static int security_context_to_sid_core(const char *scontext, u32 scontext_len, | |
1409 | u32 *sid, u32 def_sid, gfp_t gfp_flags, | |
1410 | int force) | |
1411 | { | |
9a59daa0 | 1412 | char *scontext2, *str = NULL; |
12b29f34 SS |
1413 | struct context context; |
1414 | int rc = 0; | |
1415 | ||
2172fa70 SS |
1416 | /* An empty security context is never valid. */ |
1417 | if (!scontext_len) | |
1418 | return -EINVAL; | |
1419 | ||
29784034 PM |
1420 | /* Copy the string to allow changes and ensure a NUL terminator */ |
1421 | scontext2 = kmemdup_nul(scontext, scontext_len, gfp_flags); | |
1422 | if (!scontext2) | |
1423 | return -ENOMEM; | |
1424 | ||
12b29f34 SS |
1425 | if (!ss_initialized) { |
1426 | int i; | |
1427 | ||
1428 | for (i = 1; i < SECINITSID_NUM; i++) { | |
29784034 | 1429 | if (!strcmp(initial_sid_to_string[i], scontext2)) { |
12b29f34 | 1430 | *sid = i; |
29784034 | 1431 | goto out; |
12b29f34 SS |
1432 | } |
1433 | } | |
1434 | *sid = SECINITSID_KERNEL; | |
29784034 | 1435 | goto out; |
12b29f34 SS |
1436 | } |
1437 | *sid = SECSID_NULL; | |
1438 | ||
9a59daa0 SS |
1439 | if (force) { |
1440 | /* Save another copy for storing in uninterpreted form */ | |
4b02b524 | 1441 | rc = -ENOMEM; |
9a59daa0 | 1442 | str = kstrdup(scontext2, gfp_flags); |
4b02b524 EP |
1443 | if (!str) |
1444 | goto out; | |
9a59daa0 SS |
1445 | } |
1446 | ||
0804d113 | 1447 | read_lock(&policy_rwlock); |
4b02b524 EP |
1448 | rc = string_to_context_struct(&policydb, &sidtab, scontext2, |
1449 | scontext_len, &context, def_sid); | |
12b29f34 | 1450 | if (rc == -EINVAL && force) { |
9a59daa0 | 1451 | context.str = str; |
12b29f34 | 1452 | context.len = scontext_len; |
9a59daa0 | 1453 | str = NULL; |
12b29f34 | 1454 | } else if (rc) |
4b02b524 | 1455 | goto out_unlock; |
12b29f34 | 1456 | rc = sidtab_context_to_sid(&sidtab, &context, sid); |
8e531af9 | 1457 | context_destroy(&context); |
4b02b524 | 1458 | out_unlock: |
0804d113 | 1459 | read_unlock(&policy_rwlock); |
4b02b524 | 1460 | out: |
9a59daa0 SS |
1461 | kfree(scontext2); |
1462 | kfree(str); | |
1da177e4 LT |
1463 | return rc; |
1464 | } | |
1465 | ||
f5c1d5b2 JM |
1466 | /** |
1467 | * security_context_to_sid - Obtain a SID for a given security context. | |
1468 | * @scontext: security context | |
1469 | * @scontext_len: length in bytes | |
1470 | * @sid: security identifier, SID | |
52a4c640 | 1471 | * @gfp: context for the allocation |
f5c1d5b2 JM |
1472 | * |
1473 | * Obtains a SID associated with the security context that | |
1474 | * has the string representation specified by @scontext. | |
1475 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1476 | * memory is available, or 0 on success. | |
1477 | */ | |
52a4c640 NA |
1478 | int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid, |
1479 | gfp_t gfp) | |
f5c1d5b2 JM |
1480 | { |
1481 | return security_context_to_sid_core(scontext, scontext_len, | |
52a4c640 | 1482 | sid, SECSID_NULL, gfp, 0); |
44be2f65 RV |
1483 | } |
1484 | ||
1485 | int security_context_str_to_sid(const char *scontext, u32 *sid, gfp_t gfp) | |
1486 | { | |
1487 | return security_context_to_sid(scontext, strlen(scontext), sid, gfp); | |
f5c1d5b2 JM |
1488 | } |
1489 | ||
1490 | /** | |
1491 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1492 | * falling back to specified default if needed. | |
1493 | * | |
1494 | * @scontext: security context | |
1495 | * @scontext_len: length in bytes | |
1496 | * @sid: security identifier, SID | |
d133a960 | 1497 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1498 | * |
1499 | * Obtains a SID associated with the security context that | |
1500 | * has the string representation specified by @scontext. | |
1501 | * The default SID is passed to the MLS layer to be used to allow | |
1502 | * kernel labeling of the MLS field if the MLS field is not present | |
1503 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1504 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1505 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1506 | * memory is available, or 0 on success. | |
1507 | */ | |
7bf570dc DH |
1508 | int security_context_to_sid_default(const char *scontext, u32 scontext_len, |
1509 | u32 *sid, u32 def_sid, gfp_t gfp_flags) | |
f5c1d5b2 JM |
1510 | { |
1511 | return security_context_to_sid_core(scontext, scontext_len, | |
12b29f34 SS |
1512 | sid, def_sid, gfp_flags, 1); |
1513 | } | |
1514 | ||
1515 | int security_context_to_sid_force(const char *scontext, u32 scontext_len, | |
1516 | u32 *sid) | |
1517 | { | |
1518 | return security_context_to_sid_core(scontext, scontext_len, | |
1519 | sid, SECSID_NULL, GFP_KERNEL, 1); | |
f5c1d5b2 JM |
1520 | } |
1521 | ||
1da177e4 LT |
1522 | static int compute_sid_handle_invalid_context( |
1523 | struct context *scontext, | |
1524 | struct context *tcontext, | |
1525 | u16 tclass, | |
1526 | struct context *newcontext) | |
1527 | { | |
1528 | char *s = NULL, *t = NULL, *n = NULL; | |
1529 | u32 slen, tlen, nlen; | |
1530 | ||
4b02b524 | 1531 | if (context_struct_to_string(scontext, &s, &slen)) |
1da177e4 | 1532 | goto out; |
4b02b524 | 1533 | if (context_struct_to_string(tcontext, &t, &tlen)) |
1da177e4 | 1534 | goto out; |
4b02b524 | 1535 | if (context_struct_to_string(newcontext, &n, &nlen)) |
1da177e4 | 1536 | goto out; |
9ad9ad38 | 1537 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
4093a844 RGB |
1538 | "op=security_compute_sid invalid_context=%s" |
1539 | " scontext=%s" | |
1da177e4 LT |
1540 | " tcontext=%s" |
1541 | " tclass=%s", | |
ac76c05b | 1542 | n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1)); |
1da177e4 LT |
1543 | out: |
1544 | kfree(s); | |
1545 | kfree(t); | |
1546 | kfree(n); | |
1547 | if (!selinux_enforcing) | |
1548 | return 0; | |
1549 | return -EACCES; | |
1550 | } | |
1551 | ||
652bb9b0 | 1552 | static void filename_compute_type(struct policydb *p, struct context *newcontext, |
2667991f | 1553 | u32 stype, u32 ttype, u16 tclass, |
f50a3ec9 | 1554 | const char *objname) |
652bb9b0 | 1555 | { |
2463c26d EP |
1556 | struct filename_trans ft; |
1557 | struct filename_trans_datum *otype; | |
03a4c018 EP |
1558 | |
1559 | /* | |
1560 | * Most filename trans rules are going to live in specific directories | |
1561 | * like /dev or /var/run. This bitmap will quickly skip rule searches | |
1562 | * if the ttype does not contain any rules. | |
1563 | */ | |
1564 | if (!ebitmap_get_bit(&p->filename_trans_ttypes, ttype)) | |
1565 | return; | |
1566 | ||
2463c26d EP |
1567 | ft.stype = stype; |
1568 | ft.ttype = ttype; | |
1569 | ft.tclass = tclass; | |
1570 | ft.name = objname; | |
1571 | ||
1572 | otype = hashtab_search(p->filename_trans, &ft); | |
1573 | if (otype) | |
1574 | newcontext->type = otype->otype; | |
652bb9b0 EP |
1575 | } |
1576 | ||
1da177e4 LT |
1577 | static int security_compute_sid(u32 ssid, |
1578 | u32 tsid, | |
c6d3aaa4 | 1579 | u16 orig_tclass, |
1da177e4 | 1580 | u32 specified, |
f50a3ec9 | 1581 | const char *objname, |
c6d3aaa4 SS |
1582 | u32 *out_sid, |
1583 | bool kern) | |
1da177e4 | 1584 | { |
aa893269 | 1585 | struct class_datum *cladatum = NULL; |
1da177e4 LT |
1586 | struct context *scontext = NULL, *tcontext = NULL, newcontext; |
1587 | struct role_trans *roletr = NULL; | |
1588 | struct avtab_key avkey; | |
1589 | struct avtab_datum *avdatum; | |
1590 | struct avtab_node *node; | |
c6d3aaa4 | 1591 | u16 tclass; |
1da177e4 | 1592 | int rc = 0; |
6f5317e7 | 1593 | bool sock; |
1da177e4 LT |
1594 | |
1595 | if (!ss_initialized) { | |
c6d3aaa4 SS |
1596 | switch (orig_tclass) { |
1597 | case SECCLASS_PROCESS: /* kernel value */ | |
1da177e4 LT |
1598 | *out_sid = ssid; |
1599 | break; | |
1600 | default: | |
1601 | *out_sid = tsid; | |
1602 | break; | |
1603 | } | |
1604 | goto out; | |
1605 | } | |
1606 | ||
851f8a69 VY |
1607 | context_init(&newcontext); |
1608 | ||
0804d113 | 1609 | read_lock(&policy_rwlock); |
1da177e4 | 1610 | |
6f5317e7 | 1611 | if (kern) { |
c6d3aaa4 | 1612 | tclass = unmap_class(orig_tclass); |
6f5317e7 HC |
1613 | sock = security_is_socket_class(orig_tclass); |
1614 | } else { | |
c6d3aaa4 | 1615 | tclass = orig_tclass; |
6f5317e7 HC |
1616 | sock = security_is_socket_class(map_class(tclass)); |
1617 | } | |
c6d3aaa4 | 1618 | |
1da177e4 LT |
1619 | scontext = sidtab_search(&sidtab, ssid); |
1620 | if (!scontext) { | |
744ba35e EP |
1621 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1622 | __func__, ssid); | |
1da177e4 LT |
1623 | rc = -EINVAL; |
1624 | goto out_unlock; | |
1625 | } | |
1626 | tcontext = sidtab_search(&sidtab, tsid); | |
1627 | if (!tcontext) { | |
744ba35e EP |
1628 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
1629 | __func__, tsid); | |
1da177e4 LT |
1630 | rc = -EINVAL; |
1631 | goto out_unlock; | |
1632 | } | |
1633 | ||
aa893269 EP |
1634 | if (tclass && tclass <= policydb.p_classes.nprim) |
1635 | cladatum = policydb.class_val_to_struct[tclass - 1]; | |
1636 | ||
1da177e4 LT |
1637 | /* Set the user identity. */ |
1638 | switch (specified) { | |
1639 | case AVTAB_TRANSITION: | |
1640 | case AVTAB_CHANGE: | |
aa893269 EP |
1641 | if (cladatum && cladatum->default_user == DEFAULT_TARGET) { |
1642 | newcontext.user = tcontext->user; | |
1643 | } else { | |
1644 | /* notice this gets both DEFAULT_SOURCE and unset */ | |
1645 | /* Use the process user identity. */ | |
1646 | newcontext.user = scontext->user; | |
1647 | } | |
1da177e4 LT |
1648 | break; |
1649 | case AVTAB_MEMBER: | |
1650 | /* Use the related object owner. */ | |
1651 | newcontext.user = tcontext->user; | |
1652 | break; | |
1653 | } | |
1654 | ||
aa893269 EP |
1655 | /* Set the role to default values. */ |
1656 | if (cladatum && cladatum->default_role == DEFAULT_SOURCE) { | |
1da177e4 | 1657 | newcontext.role = scontext->role; |
aa893269 EP |
1658 | } else if (cladatum && cladatum->default_role == DEFAULT_TARGET) { |
1659 | newcontext.role = tcontext->role; | |
1660 | } else { | |
1661 | if ((tclass == policydb.process_class) || (sock == true)) | |
1662 | newcontext.role = scontext->role; | |
1663 | else | |
1664 | newcontext.role = OBJECT_R_VAL; | |
1665 | } | |
1666 | ||
1667 | /* Set the type to default values. */ | |
eed7795d | 1668 | if (cladatum && cladatum->default_type == DEFAULT_SOURCE) { |
1da177e4 | 1669 | newcontext.type = scontext->type; |
eed7795d | 1670 | } else if (cladatum && cladatum->default_type == DEFAULT_TARGET) { |
1da177e4 | 1671 | newcontext.type = tcontext->type; |
eed7795d EP |
1672 | } else { |
1673 | if ((tclass == policydb.process_class) || (sock == true)) { | |
1674 | /* Use the type of process. */ | |
1675 | newcontext.type = scontext->type; | |
1676 | } else { | |
1677 | /* Use the type of the related object. */ | |
1678 | newcontext.type = tcontext->type; | |
1679 | } | |
1da177e4 LT |
1680 | } |
1681 | ||
1682 | /* Look for a type transition/member/change rule. */ | |
1683 | avkey.source_type = scontext->type; | |
1684 | avkey.target_type = tcontext->type; | |
1685 | avkey.target_class = tclass; | |
782ebb99 SS |
1686 | avkey.specified = specified; |
1687 | avdatum = avtab_search(&policydb.te_avtab, &avkey); | |
1da177e4 LT |
1688 | |
1689 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1690 | if (!avdatum) { |
782ebb99 | 1691 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
dbc74c65 | 1692 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1693 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1694 | avdatum = &node->datum; |
1695 | break; | |
1696 | } | |
1697 | } | |
1698 | } | |
1699 | ||
782ebb99 | 1700 | if (avdatum) { |
1da177e4 | 1701 | /* Use the type from the type transition/member/change rule. */ |
fa1aa143 | 1702 | newcontext.type = avdatum->u.data; |
1da177e4 LT |
1703 | } |
1704 | ||
4742600c | 1705 | /* if we have a objname this is a file trans check so check those rules */ |
f50a3ec9 | 1706 | if (objname) |
652bb9b0 | 1707 | filename_compute_type(&policydb, &newcontext, scontext->type, |
f50a3ec9 | 1708 | tcontext->type, tclass, objname); |
652bb9b0 | 1709 | |
1da177e4 | 1710 | /* Check for class-specific changes. */ |
63a312ca HC |
1711 | if (specified & AVTAB_TRANSITION) { |
1712 | /* Look for a role transition rule. */ | |
1713 | for (roletr = policydb.role_tr; roletr; roletr = roletr->next) { | |
1714 | if ((roletr->role == scontext->role) && | |
1715 | (roletr->type == tcontext->type) && | |
1716 | (roletr->tclass == tclass)) { | |
1717 | /* Use the role transition rule. */ | |
1718 | newcontext.role = roletr->new_role; | |
1719 | break; | |
1da177e4 LT |
1720 | } |
1721 | } | |
1da177e4 LT |
1722 | } |
1723 | ||
1724 | /* Set the MLS attributes. | |
1725 | This is done last because it may allocate memory. */ | |
6f5317e7 HC |
1726 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, |
1727 | &newcontext, sock); | |
1da177e4 LT |
1728 | if (rc) |
1729 | goto out_unlock; | |
1730 | ||
1731 | /* Check the validity of the context. */ | |
1732 | if (!policydb_context_isvalid(&policydb, &newcontext)) { | |
1733 | rc = compute_sid_handle_invalid_context(scontext, | |
1734 | tcontext, | |
1735 | tclass, | |
1736 | &newcontext); | |
1737 | if (rc) | |
1738 | goto out_unlock; | |
1739 | } | |
1740 | /* Obtain the sid for the context. */ | |
1741 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); | |
1742 | out_unlock: | |
0804d113 | 1743 | read_unlock(&policy_rwlock); |
1da177e4 LT |
1744 | context_destroy(&newcontext); |
1745 | out: | |
1746 | return rc; | |
1747 | } | |
1748 | ||
1749 | /** | |
1750 | * security_transition_sid - Compute the SID for a new subject/object. | |
1751 | * @ssid: source security identifier | |
1752 | * @tsid: target security identifier | |
1753 | * @tclass: target security class | |
1754 | * @out_sid: security identifier for new subject/object | |
1755 | * | |
1756 | * Compute a SID to use for labeling a new subject or object in the | |
1757 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1758 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1759 | * if insufficient memory is available, or %0 if the new SID was | |
1760 | * computed successfully. | |
1761 | */ | |
652bb9b0 EP |
1762 | int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, |
1763 | const struct qstr *qstr, u32 *out_sid) | |
1da177e4 | 1764 | { |
c6d3aaa4 | 1765 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, |
f50a3ec9 | 1766 | qstr ? qstr->name : NULL, out_sid, true); |
c6d3aaa4 SS |
1767 | } |
1768 | ||
f50a3ec9 KK |
1769 | int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, |
1770 | const char *objname, u32 *out_sid) | |
c6d3aaa4 SS |
1771 | { |
1772 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, | |
f50a3ec9 | 1773 | objname, out_sid, false); |
1da177e4 LT |
1774 | } |
1775 | ||
1776 | /** | |
1777 | * security_member_sid - Compute the SID for member selection. | |
1778 | * @ssid: source security identifier | |
1779 | * @tsid: target security identifier | |
1780 | * @tclass: target security class | |
1781 | * @out_sid: security identifier for selected member | |
1782 | * | |
1783 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1784 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1785 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1786 | * if insufficient memory is available, or %0 if the SID was | |
1787 | * computed successfully. | |
1788 | */ | |
1789 | int security_member_sid(u32 ssid, | |
1790 | u32 tsid, | |
1791 | u16 tclass, | |
1792 | u32 *out_sid) | |
1793 | { | |
652bb9b0 EP |
1794 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, NULL, |
1795 | out_sid, false); | |
1da177e4 LT |
1796 | } |
1797 | ||
1798 | /** | |
1799 | * security_change_sid - Compute the SID for object relabeling. | |
1800 | * @ssid: source security identifier | |
1801 | * @tsid: target security identifier | |
1802 | * @tclass: target security class | |
1803 | * @out_sid: security identifier for selected member | |
1804 | * | |
1805 | * Compute a SID to use for relabeling an object of class @tclass | |
1806 | * based on a SID pair (@ssid, @tsid). | |
1807 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1808 | * if insufficient memory is available, or %0 if the SID was | |
1809 | * computed successfully. | |
1810 | */ | |
1811 | int security_change_sid(u32 ssid, | |
1812 | u32 tsid, | |
1813 | u16 tclass, | |
1814 | u32 *out_sid) | |
1815 | { | |
652bb9b0 EP |
1816 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL, |
1817 | out_sid, false); | |
b94c7e67 CS |
1818 | } |
1819 | ||
1da177e4 LT |
1820 | /* Clone the SID into the new SID table. */ |
1821 | static int clone_sid(u32 sid, | |
1822 | struct context *context, | |
1823 | void *arg) | |
1824 | { | |
1825 | struct sidtab *s = arg; | |
1826 | ||
42596eaf GT |
1827 | if (sid > SECINITSID_NUM) |
1828 | return sidtab_insert(s, sid, context); | |
1829 | else | |
1830 | return 0; | |
1da177e4 LT |
1831 | } |
1832 | ||
1833 | static inline int convert_context_handle_invalid_context(struct context *context) | |
1834 | { | |
4b02b524 EP |
1835 | char *s; |
1836 | u32 len; | |
1da177e4 | 1837 | |
4b02b524 EP |
1838 | if (selinux_enforcing) |
1839 | return -EINVAL; | |
1840 | ||
1841 | if (!context_struct_to_string(context, &s, &len)) { | |
1842 | printk(KERN_WARNING "SELinux: Context %s would be invalid if enforcing\n", s); | |
1843 | kfree(s); | |
1da177e4 | 1844 | } |
4b02b524 | 1845 | return 0; |
1da177e4 LT |
1846 | } |
1847 | ||
1848 | struct convert_context_args { | |
1849 | struct policydb *oldp; | |
1850 | struct policydb *newp; | |
1851 | }; | |
1852 | ||
1853 | /* | |
1854 | * Convert the values in the security context | |
1855 | * structure `c' from the values specified | |
1856 | * in the policy `p->oldp' to the values specified | |
1857 | * in the policy `p->newp'. Verify that the | |
1858 | * context is valid under the new policy. | |
1859 | */ | |
1860 | static int convert_context(u32 key, | |
1861 | struct context *c, | |
1862 | void *p) | |
1863 | { | |
1864 | struct convert_context_args *args; | |
1865 | struct context oldc; | |
0719aaf5 GT |
1866 | struct ocontext *oc; |
1867 | struct mls_range *range; | |
1da177e4 LT |
1868 | struct role_datum *role; |
1869 | struct type_datum *typdatum; | |
1870 | struct user_datum *usrdatum; | |
1871 | char *s; | |
1872 | u32 len; | |
42596eaf GT |
1873 | int rc = 0; |
1874 | ||
1875 | if (key <= SECINITSID_NUM) | |
1876 | goto out; | |
1da177e4 LT |
1877 | |
1878 | args = p; | |
1879 | ||
12b29f34 SS |
1880 | if (c->str) { |
1881 | struct context ctx; | |
4b02b524 EP |
1882 | |
1883 | rc = -ENOMEM; | |
9a59daa0 | 1884 | s = kstrdup(c->str, GFP_KERNEL); |
4b02b524 | 1885 | if (!s) |
9a59daa0 | 1886 | goto out; |
4b02b524 | 1887 | |
9a59daa0 SS |
1888 | rc = string_to_context_struct(args->newp, NULL, s, |
1889 | c->len, &ctx, SECSID_NULL); | |
1890 | kfree(s); | |
12b29f34 | 1891 | if (!rc) { |
4b02b524 | 1892 | printk(KERN_INFO "SELinux: Context %s became valid (mapped).\n", |
12b29f34 SS |
1893 | c->str); |
1894 | /* Replace string with mapped representation. */ | |
1895 | kfree(c->str); | |
1896 | memcpy(c, &ctx, sizeof(*c)); | |
1897 | goto out; | |
1898 | } else if (rc == -EINVAL) { | |
1899 | /* Retain string representation for later mapping. */ | |
1900 | rc = 0; | |
1901 | goto out; | |
1902 | } else { | |
1903 | /* Other error condition, e.g. ENOMEM. */ | |
4b02b524 | 1904 | printk(KERN_ERR "SELinux: Unable to map context %s, rc = %d.\n", |
12b29f34 SS |
1905 | c->str, -rc); |
1906 | goto out; | |
1907 | } | |
1908 | } | |
1909 | ||
1da177e4 LT |
1910 | rc = context_cpy(&oldc, c); |
1911 | if (rc) | |
1912 | goto out; | |
1913 | ||
1da177e4 | 1914 | /* Convert the user. */ |
4b02b524 | 1915 | rc = -EINVAL; |
1da177e4 | 1916 | usrdatum = hashtab_search(args->newp->p_users.table, |
ac76c05b | 1917 | sym_name(args->oldp, SYM_USERS, c->user - 1)); |
5d55a345 | 1918 | if (!usrdatum) |
1da177e4 | 1919 | goto bad; |
1da177e4 LT |
1920 | c->user = usrdatum->value; |
1921 | ||
1922 | /* Convert the role. */ | |
4b02b524 | 1923 | rc = -EINVAL; |
1da177e4 | 1924 | role = hashtab_search(args->newp->p_roles.table, |
ac76c05b | 1925 | sym_name(args->oldp, SYM_ROLES, c->role - 1)); |
5d55a345 | 1926 | if (!role) |
1da177e4 | 1927 | goto bad; |
1da177e4 LT |
1928 | c->role = role->value; |
1929 | ||
1930 | /* Convert the type. */ | |
4b02b524 | 1931 | rc = -EINVAL; |
1da177e4 | 1932 | typdatum = hashtab_search(args->newp->p_types.table, |
ac76c05b | 1933 | sym_name(args->oldp, SYM_TYPES, c->type - 1)); |
5d55a345 | 1934 | if (!typdatum) |
1da177e4 | 1935 | goto bad; |
1da177e4 LT |
1936 | c->type = typdatum->value; |
1937 | ||
0719aaf5 GT |
1938 | /* Convert the MLS fields if dealing with MLS policies */ |
1939 | if (args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1940 | rc = mls_convert_context(args->oldp, args->newp, c); | |
1941 | if (rc) | |
1942 | goto bad; | |
1943 | } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) { | |
1944 | /* | |
1945 | * Switching between MLS and non-MLS policy: | |
1946 | * free any storage used by the MLS fields in the | |
1947 | * context for all existing entries in the sidtab. | |
1948 | */ | |
1949 | mls_context_destroy(c); | |
1950 | } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) { | |
1951 | /* | |
1952 | * Switching between non-MLS and MLS policy: | |
1953 | * ensure that the MLS fields of the context for all | |
1954 | * existing entries in the sidtab are filled in with a | |
1955 | * suitable default value, likely taken from one of the | |
1956 | * initial SIDs. | |
1957 | */ | |
1958 | oc = args->newp->ocontexts[OCON_ISID]; | |
1959 | while (oc && oc->sid[0] != SECINITSID_UNLABELED) | |
1960 | oc = oc->next; | |
4b02b524 | 1961 | rc = -EINVAL; |
0719aaf5 GT |
1962 | if (!oc) { |
1963 | printk(KERN_ERR "SELinux: unable to look up" | |
1964 | " the initial SIDs list\n"); | |
1965 | goto bad; | |
1966 | } | |
1967 | range = &oc->context[0].range; | |
1968 | rc = mls_range_set(c, range); | |
1969 | if (rc) | |
1970 | goto bad; | |
1971 | } | |
1da177e4 LT |
1972 | |
1973 | /* Check the validity of the new context. */ | |
1974 | if (!policydb_context_isvalid(args->newp, c)) { | |
1975 | rc = convert_context_handle_invalid_context(&oldc); | |
1976 | if (rc) | |
1977 | goto bad; | |
1978 | } | |
1979 | ||
1980 | context_destroy(&oldc); | |
4b02b524 | 1981 | |
12b29f34 | 1982 | rc = 0; |
1da177e4 LT |
1983 | out: |
1984 | return rc; | |
1985 | bad: | |
12b29f34 | 1986 | /* Map old representation to string and save it. */ |
4b02b524 EP |
1987 | rc = context_struct_to_string(&oldc, &s, &len); |
1988 | if (rc) | |
1989 | return rc; | |
1da177e4 | 1990 | context_destroy(&oldc); |
12b29f34 SS |
1991 | context_destroy(c); |
1992 | c->str = s; | |
1993 | c->len = len; | |
4b02b524 | 1994 | printk(KERN_INFO "SELinux: Context %s became invalid (unmapped).\n", |
12b29f34 SS |
1995 | c->str); |
1996 | rc = 0; | |
1da177e4 LT |
1997 | goto out; |
1998 | } | |
1999 | ||
3bb56b25 PM |
2000 | static void security_load_policycaps(void) |
2001 | { | |
4dc2fce3 SS |
2002 | unsigned int i; |
2003 | struct ebitmap_node *node; | |
2004 | ||
3bb56b25 PM |
2005 | selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps, |
2006 | POLICYDB_CAPABILITY_NETPEER); | |
b0c636b9 EP |
2007 | selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps, |
2008 | POLICYDB_CAPABILITY_OPENPERM); | |
da69a530 SS |
2009 | selinux_policycap_extsockclass = ebitmap_get_bit(&policydb.policycaps, |
2010 | POLICYDB_CAPABILITY_EXTSOCKCLASS); | |
2be4d74f CP |
2011 | selinux_policycap_alwaysnetwork = ebitmap_get_bit(&policydb.policycaps, |
2012 | POLICYDB_CAPABILITY_ALWAYSNETWORK); | |
2651225b SS |
2013 | selinux_policycap_cgroupseclabel = |
2014 | ebitmap_get_bit(&policydb.policycaps, | |
2015 | POLICYDB_CAPABILITY_CGROUPSECLABEL); | |
af63f419 SS |
2016 | selinux_policycap_nnp_nosuid_transition = |
2017 | ebitmap_get_bit(&policydb.policycaps, | |
2018 | POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION); | |
4dc2fce3 SS |
2019 | |
2020 | for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++) | |
2021 | pr_info("SELinux: policy capability %s=%d\n", | |
2022 | selinux_policycap_names[i], | |
2023 | ebitmap_get_bit(&policydb.policycaps, i)); | |
2024 | ||
2025 | ebitmap_for_each_positive_bit(&policydb.policycaps, node, i) { | |
2026 | if (i >= ARRAY_SIZE(selinux_policycap_names)) | |
2027 | pr_info("SELinux: unknown policy capability %u\n", | |
2028 | i); | |
2029 | } | |
3bb56b25 PM |
2030 | } |
2031 | ||
e900a7d9 | 2032 | static int security_preserve_bools(struct policydb *p); |
1da177e4 LT |
2033 | |
2034 | /** | |
2035 | * security_load_policy - Load a security policy configuration. | |
2036 | * @data: binary policy data | |
2037 | * @len: length of data in bytes | |
2038 | * | |
2039 | * Load a new set of security policy configuration data, | |
2040 | * validate it and convert the SID table as necessary. | |
2041 | * This function will flush the access vector cache after | |
2042 | * loading the new policy. | |
2043 | */ | |
2044 | int security_load_policy(void *data, size_t len) | |
2045 | { | |
b5495b42 | 2046 | struct policydb *oldpolicydb, *newpolicydb; |
1da177e4 | 2047 | struct sidtab oldsidtab, newsidtab; |
c6d3aaa4 | 2048 | struct selinux_mapping *oldmap, *map = NULL; |
1da177e4 LT |
2049 | struct convert_context_args args; |
2050 | u32 seqno; | |
c6d3aaa4 | 2051 | u16 map_size; |
1da177e4 LT |
2052 | int rc = 0; |
2053 | struct policy_file file = { data, len }, *fp = &file; | |
2054 | ||
b5495b42 TG |
2055 | oldpolicydb = kzalloc(2 * sizeof(*oldpolicydb), GFP_KERNEL); |
2056 | if (!oldpolicydb) { | |
2057 | rc = -ENOMEM; | |
2058 | goto out; | |
2059 | } | |
2060 | newpolicydb = oldpolicydb + 1; | |
2061 | ||
1da177e4 LT |
2062 | if (!ss_initialized) { |
2063 | avtab_cache_init(); | |
b4958c89 | 2064 | ebitmap_cache_init(); |
7c620ece | 2065 | hashtab_cache_init(); |
a2000050 EP |
2066 | rc = policydb_read(&policydb, fp); |
2067 | if (rc) { | |
1da177e4 | 2068 | avtab_cache_destroy(); |
b4958c89 | 2069 | ebitmap_cache_destroy(); |
7c620ece | 2070 | hashtab_cache_destroy(); |
b5495b42 | 2071 | goto out; |
1da177e4 | 2072 | } |
a2000050 | 2073 | |
cee74f47 | 2074 | policydb.len = len; |
a2000050 EP |
2075 | rc = selinux_set_mapping(&policydb, secclass_map, |
2076 | ¤t_mapping, | |
2077 | ¤t_mapping_size); | |
2078 | if (rc) { | |
1da177e4 LT |
2079 | policydb_destroy(&policydb); |
2080 | avtab_cache_destroy(); | |
b4958c89 | 2081 | ebitmap_cache_destroy(); |
7c620ece | 2082 | hashtab_cache_destroy(); |
b5495b42 | 2083 | goto out; |
1da177e4 | 2084 | } |
a2000050 EP |
2085 | |
2086 | rc = policydb_load_isids(&policydb, &sidtab); | |
2087 | if (rc) { | |
b94c7e67 CS |
2088 | policydb_destroy(&policydb); |
2089 | avtab_cache_destroy(); | |
b4958c89 | 2090 | ebitmap_cache_destroy(); |
7c620ece | 2091 | hashtab_cache_destroy(); |
b5495b42 | 2092 | goto out; |
b94c7e67 | 2093 | } |
a2000050 | 2094 | |
3bb56b25 | 2095 | security_load_policycaps(); |
1da177e4 | 2096 | ss_initialized = 1; |
4c443d1b | 2097 | seqno = ++latest_granting; |
1da177e4 | 2098 | selinux_complete_init(); |
4c443d1b SS |
2099 | avc_ss_reset(seqno); |
2100 | selnl_notify_policyload(seqno); | |
11904167 | 2101 | selinux_status_update_policyload(seqno); |
7420ed23 | 2102 | selinux_netlbl_cache_invalidate(); |
342a0cff | 2103 | selinux_xfrm_notify_policyload(); |
b5495b42 | 2104 | goto out; |
1da177e4 LT |
2105 | } |
2106 | ||
2107 | #if 0 | |
2108 | sidtab_hash_eval(&sidtab, "sids"); | |
2109 | #endif | |
2110 | ||
b5495b42 | 2111 | rc = policydb_read(newpolicydb, fp); |
a2000050 | 2112 | if (rc) |
b5495b42 | 2113 | goto out; |
1da177e4 | 2114 | |
b5495b42 | 2115 | newpolicydb->len = len; |
0719aaf5 | 2116 | /* If switching between different policy types, log MLS status */ |
b5495b42 | 2117 | if (policydb.mls_enabled && !newpolicydb->mls_enabled) |
0719aaf5 | 2118 | printk(KERN_INFO "SELinux: Disabling MLS support...\n"); |
b5495b42 | 2119 | else if (!policydb.mls_enabled && newpolicydb->mls_enabled) |
0719aaf5 GT |
2120 | printk(KERN_INFO "SELinux: Enabling MLS support...\n"); |
2121 | ||
b5495b42 | 2122 | rc = policydb_load_isids(newpolicydb, &newsidtab); |
42596eaf GT |
2123 | if (rc) { |
2124 | printk(KERN_ERR "SELinux: unable to load the initial SIDs\n"); | |
b5495b42 TG |
2125 | policydb_destroy(newpolicydb); |
2126 | goto out; | |
12b29f34 | 2127 | } |
1da177e4 | 2128 | |
b5495b42 | 2129 | rc = selinux_set_mapping(newpolicydb, secclass_map, &map, &map_size); |
a2000050 | 2130 | if (rc) |
b94c7e67 | 2131 | goto err; |
b94c7e67 | 2132 | |
b5495b42 | 2133 | rc = security_preserve_bools(newpolicydb); |
e900a7d9 | 2134 | if (rc) { |
454d972c | 2135 | printk(KERN_ERR "SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
2136 | goto err; |
2137 | } | |
2138 | ||
1da177e4 LT |
2139 | /* Clone the SID table. */ |
2140 | sidtab_shutdown(&sidtab); | |
a2000050 EP |
2141 | |
2142 | rc = sidtab_map(&sidtab, clone_sid, &newsidtab); | |
2143 | if (rc) | |
1da177e4 | 2144 | goto err; |
1da177e4 | 2145 | |
12b29f34 SS |
2146 | /* |
2147 | * Convert the internal representations of contexts | |
2148 | * in the new SID table. | |
2149 | */ | |
1da177e4 | 2150 | args.oldp = &policydb; |
b5495b42 | 2151 | args.newp = newpolicydb; |
12b29f34 | 2152 | rc = sidtab_map(&newsidtab, convert_context, &args); |
0719aaf5 GT |
2153 | if (rc) { |
2154 | printk(KERN_ERR "SELinux: unable to convert the internal" | |
2155 | " representation of contexts in the new SID" | |
2156 | " table\n"); | |
12b29f34 | 2157 | goto err; |
0719aaf5 | 2158 | } |
1da177e4 LT |
2159 | |
2160 | /* Save the old policydb and SID table to free later. */ | |
b5495b42 | 2161 | memcpy(oldpolicydb, &policydb, sizeof(policydb)); |
1da177e4 LT |
2162 | sidtab_set(&oldsidtab, &sidtab); |
2163 | ||
2164 | /* Install the new policydb and SID table. */ | |
0804d113 | 2165 | write_lock_irq(&policy_rwlock); |
b5495b42 | 2166 | memcpy(&policydb, newpolicydb, sizeof(policydb)); |
1da177e4 | 2167 | sidtab_set(&sidtab, &newsidtab); |
3bb56b25 | 2168 | security_load_policycaps(); |
c6d3aaa4 SS |
2169 | oldmap = current_mapping; |
2170 | current_mapping = map; | |
2171 | current_mapping_size = map_size; | |
1da177e4 | 2172 | seqno = ++latest_granting; |
0804d113 | 2173 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2174 | |
2175 | /* Free the old policydb and SID table. */ | |
b5495b42 | 2176 | policydb_destroy(oldpolicydb); |
1da177e4 | 2177 | sidtab_destroy(&oldsidtab); |
c6d3aaa4 | 2178 | kfree(oldmap); |
1da177e4 LT |
2179 | |
2180 | avc_ss_reset(seqno); | |
2181 | selnl_notify_policyload(seqno); | |
11904167 | 2182 | selinux_status_update_policyload(seqno); |
7420ed23 | 2183 | selinux_netlbl_cache_invalidate(); |
342a0cff | 2184 | selinux_xfrm_notify_policyload(); |
1da177e4 | 2185 | |
b5495b42 TG |
2186 | rc = 0; |
2187 | goto out; | |
1da177e4 LT |
2188 | |
2189 | err: | |
c6d3aaa4 | 2190 | kfree(map); |
1da177e4 | 2191 | sidtab_destroy(&newsidtab); |
b5495b42 | 2192 | policydb_destroy(newpolicydb); |
1da177e4 | 2193 | |
b5495b42 TG |
2194 | out: |
2195 | kfree(oldpolicydb); | |
2196 | return rc; | |
1da177e4 LT |
2197 | } |
2198 | ||
cee74f47 EP |
2199 | size_t security_policydb_len(void) |
2200 | { | |
2201 | size_t len; | |
2202 | ||
2203 | read_lock(&policy_rwlock); | |
2204 | len = policydb.len; | |
2205 | read_unlock(&policy_rwlock); | |
2206 | ||
2207 | return len; | |
2208 | } | |
2209 | ||
1da177e4 LT |
2210 | /** |
2211 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
2212 | * @protocol: protocol number |
2213 | * @port: port number | |
2214 | * @out_sid: security identifier | |
2215 | */ | |
3e112172 | 2216 | int security_port_sid(u8 protocol, u16 port, u32 *out_sid) |
1da177e4 LT |
2217 | { |
2218 | struct ocontext *c; | |
2219 | int rc = 0; | |
2220 | ||
0804d113 | 2221 | read_lock(&policy_rwlock); |
1da177e4 LT |
2222 | |
2223 | c = policydb.ocontexts[OCON_PORT]; | |
2224 | while (c) { | |
2225 | if (c->u.port.protocol == protocol && | |
2226 | c->u.port.low_port <= port && | |
2227 | c->u.port.high_port >= port) | |
2228 | break; | |
2229 | c = c->next; | |
2230 | } | |
2231 | ||
2232 | if (c) { | |
2233 | if (!c->sid[0]) { | |
2234 | rc = sidtab_context_to_sid(&sidtab, | |
2235 | &c->context[0], | |
2236 | &c->sid[0]); | |
2237 | if (rc) | |
2238 | goto out; | |
2239 | } | |
2240 | *out_sid = c->sid[0]; | |
2241 | } else { | |
2242 | *out_sid = SECINITSID_PORT; | |
2243 | } | |
2244 | ||
2245 | out: | |
0804d113 | 2246 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2247 | return rc; |
2248 | } | |
2249 | ||
cfc4d882 DJ |
2250 | /** |
2251 | * security_pkey_sid - Obtain the SID for a pkey. | |
2252 | * @subnet_prefix: Subnet Prefix | |
2253 | * @pkey_num: pkey number | |
2254 | * @out_sid: security identifier | |
2255 | */ | |
2256 | int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid) | |
2257 | { | |
2258 | struct ocontext *c; | |
2259 | int rc = 0; | |
2260 | ||
2261 | read_lock(&policy_rwlock); | |
2262 | ||
2263 | c = policydb.ocontexts[OCON_IBPKEY]; | |
2264 | while (c) { | |
2265 | if (c->u.ibpkey.low_pkey <= pkey_num && | |
2266 | c->u.ibpkey.high_pkey >= pkey_num && | |
2267 | c->u.ibpkey.subnet_prefix == subnet_prefix) | |
2268 | break; | |
2269 | ||
2270 | c = c->next; | |
2271 | } | |
2272 | ||
2273 | if (c) { | |
2274 | if (!c->sid[0]) { | |
2275 | rc = sidtab_context_to_sid(&sidtab, | |
2276 | &c->context[0], | |
2277 | &c->sid[0]); | |
2278 | if (rc) | |
2279 | goto out; | |
2280 | } | |
2281 | *out_sid = c->sid[0]; | |
2282 | } else | |
2283 | *out_sid = SECINITSID_UNLABELED; | |
2284 | ||
2285 | out: | |
2286 | read_unlock(&policy_rwlock); | |
2287 | return rc; | |
2288 | } | |
2289 | ||
ab861dfc DJ |
2290 | /** |
2291 | * security_ib_endport_sid - Obtain the SID for a subnet management interface. | |
2292 | * @dev_name: device name | |
2293 | * @port: port number | |
2294 | * @out_sid: security identifier | |
2295 | */ | |
2296 | int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid) | |
2297 | { | |
2298 | struct ocontext *c; | |
2299 | int rc = 0; | |
2300 | ||
2301 | read_lock(&policy_rwlock); | |
2302 | ||
2303 | c = policydb.ocontexts[OCON_IBENDPORT]; | |
2304 | while (c) { | |
2305 | if (c->u.ibendport.port == port_num && | |
2306 | !strncmp(c->u.ibendport.dev_name, | |
2307 | dev_name, | |
2308 | IB_DEVICE_NAME_MAX)) | |
2309 | break; | |
2310 | ||
2311 | c = c->next; | |
2312 | } | |
2313 | ||
2314 | if (c) { | |
2315 | if (!c->sid[0]) { | |
2316 | rc = sidtab_context_to_sid(&sidtab, | |
2317 | &c->context[0], | |
2318 | &c->sid[0]); | |
2319 | if (rc) | |
2320 | goto out; | |
2321 | } | |
2322 | *out_sid = c->sid[0]; | |
2323 | } else | |
2324 | *out_sid = SECINITSID_UNLABELED; | |
2325 | ||
2326 | out: | |
2327 | read_unlock(&policy_rwlock); | |
2328 | return rc; | |
2329 | } | |
2330 | ||
1da177e4 LT |
2331 | /** |
2332 | * security_netif_sid - Obtain the SID for a network interface. | |
2333 | * @name: interface name | |
2334 | * @if_sid: interface SID | |
1da177e4 | 2335 | */ |
e8bfdb9d | 2336 | int security_netif_sid(char *name, u32 *if_sid) |
1da177e4 LT |
2337 | { |
2338 | int rc = 0; | |
2339 | struct ocontext *c; | |
2340 | ||
0804d113 | 2341 | read_lock(&policy_rwlock); |
1da177e4 LT |
2342 | |
2343 | c = policydb.ocontexts[OCON_NETIF]; | |
2344 | while (c) { | |
2345 | if (strcmp(name, c->u.name) == 0) | |
2346 | break; | |
2347 | c = c->next; | |
2348 | } | |
2349 | ||
2350 | if (c) { | |
2351 | if (!c->sid[0] || !c->sid[1]) { | |
2352 | rc = sidtab_context_to_sid(&sidtab, | |
2353 | &c->context[0], | |
2354 | &c->sid[0]); | |
2355 | if (rc) | |
2356 | goto out; | |
2357 | rc = sidtab_context_to_sid(&sidtab, | |
2358 | &c->context[1], | |
2359 | &c->sid[1]); | |
2360 | if (rc) | |
2361 | goto out; | |
2362 | } | |
2363 | *if_sid = c->sid[0]; | |
e8bfdb9d | 2364 | } else |
1da177e4 | 2365 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
2366 | |
2367 | out: | |
0804d113 | 2368 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2369 | return rc; |
2370 | } | |
2371 | ||
2372 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
2373 | { | |
2374 | int i, fail = 0; | |
2375 | ||
5d55a345 EP |
2376 | for (i = 0; i < 4; i++) |
2377 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
2378 | fail = 1; |
2379 | break; | |
2380 | } | |
2381 | ||
2382 | return !fail; | |
2383 | } | |
2384 | ||
2385 | /** | |
2386 | * security_node_sid - Obtain the SID for a node (host). | |
2387 | * @domain: communication domain aka address family | |
2388 | * @addrp: address | |
2389 | * @addrlen: address length in bytes | |
2390 | * @out_sid: security identifier | |
2391 | */ | |
2392 | int security_node_sid(u16 domain, | |
2393 | void *addrp, | |
2394 | u32 addrlen, | |
2395 | u32 *out_sid) | |
2396 | { | |
4b02b524 | 2397 | int rc; |
1da177e4 LT |
2398 | struct ocontext *c; |
2399 | ||
0804d113 | 2400 | read_lock(&policy_rwlock); |
1da177e4 LT |
2401 | |
2402 | switch (domain) { | |
2403 | case AF_INET: { | |
2404 | u32 addr; | |
2405 | ||
4b02b524 EP |
2406 | rc = -EINVAL; |
2407 | if (addrlen != sizeof(u32)) | |
1da177e4 | 2408 | goto out; |
1da177e4 LT |
2409 | |
2410 | addr = *((u32 *)addrp); | |
2411 | ||
2412 | c = policydb.ocontexts[OCON_NODE]; | |
2413 | while (c) { | |
2414 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
2415 | break; | |
2416 | c = c->next; | |
2417 | } | |
2418 | break; | |
2419 | } | |
2420 | ||
2421 | case AF_INET6: | |
4b02b524 EP |
2422 | rc = -EINVAL; |
2423 | if (addrlen != sizeof(u64) * 2) | |
1da177e4 | 2424 | goto out; |
1da177e4 LT |
2425 | c = policydb.ocontexts[OCON_NODE6]; |
2426 | while (c) { | |
2427 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
2428 | c->u.node6.mask)) | |
2429 | break; | |
2430 | c = c->next; | |
2431 | } | |
2432 | break; | |
2433 | ||
2434 | default: | |
4b02b524 | 2435 | rc = 0; |
1da177e4 LT |
2436 | *out_sid = SECINITSID_NODE; |
2437 | goto out; | |
2438 | } | |
2439 | ||
2440 | if (c) { | |
2441 | if (!c->sid[0]) { | |
2442 | rc = sidtab_context_to_sid(&sidtab, | |
2443 | &c->context[0], | |
2444 | &c->sid[0]); | |
2445 | if (rc) | |
2446 | goto out; | |
2447 | } | |
2448 | *out_sid = c->sid[0]; | |
2449 | } else { | |
2450 | *out_sid = SECINITSID_NODE; | |
2451 | } | |
2452 | ||
4b02b524 | 2453 | rc = 0; |
1da177e4 | 2454 | out: |
0804d113 | 2455 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2456 | return rc; |
2457 | } | |
2458 | ||
2459 | #define SIDS_NEL 25 | |
2460 | ||
2461 | /** | |
2462 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
2463 | * @fromsid: starting SID | |
2464 | * @username: username | |
2465 | * @sids: array of reachable SIDs for user | |
2466 | * @nel: number of elements in @sids | |
2467 | * | |
2468 | * Generate the set of SIDs for legal security contexts | |
2469 | * for a given user that can be reached by @fromsid. | |
2470 | * Set *@sids to point to a dynamically allocated | |
2471 | * array containing the set of SIDs. Set *@nel to the | |
2472 | * number of elements in the array. | |
2473 | */ | |
2474 | ||
2475 | int security_get_user_sids(u32 fromsid, | |
5d55a345 | 2476 | char *username, |
1da177e4 LT |
2477 | u32 **sids, |
2478 | u32 *nel) | |
2479 | { | |
2480 | struct context *fromcon, usercon; | |
2c3c05db | 2481 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
2482 | u32 mynel = 0, maxnel = SIDS_NEL; |
2483 | struct user_datum *user; | |
2484 | struct role_datum *role; | |
782ebb99 | 2485 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
2486 | int rc = 0, i, j; |
2487 | ||
2c3c05db SS |
2488 | *sids = NULL; |
2489 | *nel = 0; | |
2490 | ||
2491 | if (!ss_initialized) | |
1da177e4 | 2492 | goto out; |
1da177e4 | 2493 | |
0804d113 | 2494 | read_lock(&policy_rwlock); |
1da177e4 | 2495 | |
12b29f34 SS |
2496 | context_init(&usercon); |
2497 | ||
4b02b524 | 2498 | rc = -EINVAL; |
1da177e4 | 2499 | fromcon = sidtab_search(&sidtab, fromsid); |
4b02b524 | 2500 | if (!fromcon) |
1da177e4 | 2501 | goto out_unlock; |
1da177e4 | 2502 | |
4b02b524 | 2503 | rc = -EINVAL; |
1da177e4 | 2504 | user = hashtab_search(policydb.p_users.table, username); |
4b02b524 | 2505 | if (!user) |
1da177e4 | 2506 | goto out_unlock; |
4b02b524 | 2507 | |
1da177e4 LT |
2508 | usercon.user = user->value; |
2509 | ||
4b02b524 | 2510 | rc = -ENOMEM; |
89d155ef | 2511 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
4b02b524 | 2512 | if (!mysids) |
1da177e4 | 2513 | goto out_unlock; |
1da177e4 | 2514 | |
9fe79ad1 | 2515 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
1da177e4 | 2516 | role = policydb.role_val_to_struct[i]; |
c1a7368a | 2517 | usercon.role = i + 1; |
9fe79ad1 | 2518 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
c1a7368a | 2519 | usercon.type = j + 1; |
1da177e4 LT |
2520 | |
2521 | if (mls_setup_user_range(fromcon, user, &usercon)) | |
2522 | continue; | |
2523 | ||
1da177e4 | 2524 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
2c3c05db | 2525 | if (rc) |
1da177e4 | 2526 | goto out_unlock; |
1da177e4 LT |
2527 | if (mynel < maxnel) { |
2528 | mysids[mynel++] = sid; | |
2529 | } else { | |
4b02b524 | 2530 | rc = -ENOMEM; |
1da177e4 | 2531 | maxnel += SIDS_NEL; |
89d155ef | 2532 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
4b02b524 | 2533 | if (!mysids2) |
1da177e4 | 2534 | goto out_unlock; |
1da177e4 LT |
2535 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2536 | kfree(mysids); | |
2537 | mysids = mysids2; | |
2538 | mysids[mynel++] = sid; | |
2539 | } | |
2540 | } | |
2541 | } | |
4b02b524 | 2542 | rc = 0; |
1da177e4 | 2543 | out_unlock: |
0804d113 | 2544 | read_unlock(&policy_rwlock); |
2c3c05db SS |
2545 | if (rc || !mynel) { |
2546 | kfree(mysids); | |
2547 | goto out; | |
2548 | } | |
2549 | ||
4b02b524 | 2550 | rc = -ENOMEM; |
2c3c05db SS |
2551 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); |
2552 | if (!mysids2) { | |
2c3c05db SS |
2553 | kfree(mysids); |
2554 | goto out; | |
2555 | } | |
2556 | for (i = 0, j = 0; i < mynel; i++) { | |
f01e1af4 | 2557 | struct av_decision dummy_avd; |
2c3c05db | 2558 | rc = avc_has_perm_noaudit(fromsid, mysids[i], |
c6d3aaa4 | 2559 | SECCLASS_PROCESS, /* kernel value */ |
2c3c05db | 2560 | PROCESS__TRANSITION, AVC_STRICT, |
f01e1af4 | 2561 | &dummy_avd); |
2c3c05db SS |
2562 | if (!rc) |
2563 | mysids2[j++] = mysids[i]; | |
2564 | cond_resched(); | |
2565 | } | |
2566 | rc = 0; | |
2567 | kfree(mysids); | |
2568 | *sids = mysids2; | |
2569 | *nel = j; | |
1da177e4 LT |
2570 | out: |
2571 | return rc; | |
2572 | } | |
2573 | ||
2574 | /** | |
f31e7994 | 2575 | * __security_genfs_sid - Helper to obtain a SID for a file in a filesystem |
1da177e4 LT |
2576 | * @fstype: filesystem type |
2577 | * @path: path from root of mount | |
2578 | * @sclass: file security class | |
2579 | * @sid: SID for path | |
2580 | * | |
2581 | * Obtain a SID to use for a file in a filesystem that | |
2582 | * cannot support xattr or use a fixed labeling behavior like | |
2583 | * transition SIDs or task SIDs. | |
f31e7994 WL |
2584 | * |
2585 | * The caller must acquire the policy_rwlock before calling this function. | |
1da177e4 | 2586 | */ |
f31e7994 WL |
2587 | static inline int __security_genfs_sid(const char *fstype, |
2588 | char *path, | |
2589 | u16 orig_sclass, | |
2590 | u32 *sid) | |
1da177e4 LT |
2591 | { |
2592 | int len; | |
c6d3aaa4 | 2593 | u16 sclass; |
1da177e4 LT |
2594 | struct genfs *genfs; |
2595 | struct ocontext *c; | |
4b02b524 | 2596 | int rc, cmp = 0; |
1da177e4 | 2597 | |
b1aa5301 SS |
2598 | while (path[0] == '/' && path[1] == '/') |
2599 | path++; | |
2600 | ||
c6d3aaa4 | 2601 | sclass = unmap_class(orig_sclass); |
4b02b524 | 2602 | *sid = SECINITSID_UNLABELED; |
c6d3aaa4 | 2603 | |
1da177e4 LT |
2604 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { |
2605 | cmp = strcmp(fstype, genfs->fstype); | |
2606 | if (cmp <= 0) | |
2607 | break; | |
2608 | } | |
2609 | ||
4b02b524 EP |
2610 | rc = -ENOENT; |
2611 | if (!genfs || cmp) | |
1da177e4 | 2612 | goto out; |
1da177e4 LT |
2613 | |
2614 | for (c = genfs->head; c; c = c->next) { | |
2615 | len = strlen(c->u.name); | |
2616 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2617 | (strncmp(c->u.name, path, len) == 0)) | |
2618 | break; | |
2619 | } | |
2620 | ||
4b02b524 EP |
2621 | rc = -ENOENT; |
2622 | if (!c) | |
1da177e4 | 2623 | goto out; |
1da177e4 LT |
2624 | |
2625 | if (!c->sid[0]) { | |
4b02b524 | 2626 | rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]); |
1da177e4 LT |
2627 | if (rc) |
2628 | goto out; | |
2629 | } | |
2630 | ||
2631 | *sid = c->sid[0]; | |
4b02b524 | 2632 | rc = 0; |
1da177e4 | 2633 | out: |
1da177e4 LT |
2634 | return rc; |
2635 | } | |
2636 | ||
f31e7994 WL |
2637 | /** |
2638 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2639 | * @fstype: filesystem type | |
2640 | * @path: path from root of mount | |
2641 | * @sclass: file security class | |
2642 | * @sid: SID for path | |
2643 | * | |
2644 | * Acquire policy_rwlock before calling __security_genfs_sid() and release | |
2645 | * it afterward. | |
2646 | */ | |
2647 | int security_genfs_sid(const char *fstype, | |
2648 | char *path, | |
2649 | u16 orig_sclass, | |
2650 | u32 *sid) | |
2651 | { | |
2652 | int retval; | |
2653 | ||
2654 | read_lock(&policy_rwlock); | |
2655 | retval = __security_genfs_sid(fstype, path, orig_sclass, sid); | |
2656 | read_unlock(&policy_rwlock); | |
2657 | return retval; | |
2658 | } | |
2659 | ||
1da177e4 LT |
2660 | /** |
2661 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
a64c54cf | 2662 | * @sb: superblock in question |
1da177e4 | 2663 | */ |
a64c54cf | 2664 | int security_fs_use(struct super_block *sb) |
1da177e4 LT |
2665 | { |
2666 | int rc = 0; | |
2667 | struct ocontext *c; | |
7a90fc39 | 2668 | struct superblock_security_struct *sbsec = selinux_superblock(sb); |
a64c54cf | 2669 | const char *fstype = sb->s_type->name; |
1da177e4 | 2670 | |
0804d113 | 2671 | read_lock(&policy_rwlock); |
1da177e4 | 2672 | |
4d546f81 PM |
2673 | c = policydb.ocontexts[OCON_FSUSE]; |
2674 | while (c) { | |
2675 | if (strcmp(fstype, c->u.name) == 0) | |
1da177e4 | 2676 | break; |
4d546f81 | 2677 | c = c->next; |
1da177e4 LT |
2678 | } |
2679 | ||
2680 | if (c) { | |
a64c54cf | 2681 | sbsec->behavior = c->v.behavior; |
1da177e4 | 2682 | if (!c->sid[0]) { |
4b02b524 | 2683 | rc = sidtab_context_to_sid(&sidtab, &c->context[0], |
1da177e4 LT |
2684 | &c->sid[0]); |
2685 | if (rc) | |
2686 | goto out; | |
2687 | } | |
a64c54cf | 2688 | sbsec->sid = c->sid[0]; |
1da177e4 | 2689 | } else { |
f31e7994 WL |
2690 | rc = __security_genfs_sid(fstype, "/", SECCLASS_DIR, |
2691 | &sbsec->sid); | |
089be43e | 2692 | if (rc) { |
a64c54cf | 2693 | sbsec->behavior = SECURITY_FS_USE_NONE; |
089be43e JM |
2694 | rc = 0; |
2695 | } else { | |
a64c54cf | 2696 | sbsec->behavior = SECURITY_FS_USE_GENFS; |
089be43e | 2697 | } |
1da177e4 LT |
2698 | } |
2699 | ||
2700 | out: | |
0804d113 | 2701 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2702 | return rc; |
2703 | } | |
2704 | ||
2705 | int security_get_bools(int *len, char ***names, int **values) | |
2706 | { | |
4b02b524 | 2707 | int i, rc; |
1da177e4 | 2708 | |
0804d113 | 2709 | read_lock(&policy_rwlock); |
1da177e4 LT |
2710 | *names = NULL; |
2711 | *values = NULL; | |
2712 | ||
4b02b524 | 2713 | rc = 0; |
1da177e4 | 2714 | *len = policydb.p_bools.nprim; |
4b02b524 | 2715 | if (!*len) |
1da177e4 | 2716 | goto out; |
1da177e4 | 2717 | |
4b02b524 EP |
2718 | rc = -ENOMEM; |
2719 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); | |
1da177e4 LT |
2720 | if (!*names) |
2721 | goto err; | |
1da177e4 | 2722 | |
4b02b524 EP |
2723 | rc = -ENOMEM; |
2724 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); | |
1da177e4 LT |
2725 | if (!*values) |
2726 | goto err; | |
2727 | ||
2728 | for (i = 0; i < *len; i++) { | |
1da177e4 | 2729 | (*values)[i] = policydb.bool_val_to_struct[i]->state; |
4b02b524 EP |
2730 | |
2731 | rc = -ENOMEM; | |
21b76f19 | 2732 | (*names)[i] = kstrdup(sym_name(&policydb, SYM_BOOLS, i), GFP_ATOMIC); |
1da177e4 LT |
2733 | if (!(*names)[i]) |
2734 | goto err; | |
1da177e4 LT |
2735 | } |
2736 | rc = 0; | |
2737 | out: | |
0804d113 | 2738 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2739 | return rc; |
2740 | err: | |
2741 | if (*names) { | |
2742 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2743 | kfree((*names)[i]); |
1da177e4 | 2744 | } |
9a5f04bf | 2745 | kfree(*values); |
1da177e4 LT |
2746 | goto out; |
2747 | } | |
2748 | ||
2749 | ||
2750 | int security_set_bools(int len, int *values) | |
2751 | { | |
4b02b524 | 2752 | int i, rc; |
1da177e4 LT |
2753 | int lenp, seqno = 0; |
2754 | struct cond_node *cur; | |
2755 | ||
0804d113 | 2756 | write_lock_irq(&policy_rwlock); |
1da177e4 | 2757 | |
4b02b524 | 2758 | rc = -EFAULT; |
1da177e4 | 2759 | lenp = policydb.p_bools.nprim; |
4b02b524 | 2760 | if (len != lenp) |
1da177e4 | 2761 | goto out; |
1da177e4 | 2762 | |
1da177e4 | 2763 | for (i = 0; i < len; i++) { |
af601e46 SG |
2764 | if (!!values[i] != policydb.bool_val_to_struct[i]->state) { |
2765 | audit_log(current->audit_context, GFP_ATOMIC, | |
2766 | AUDIT_MAC_CONFIG_CHANGE, | |
4746ec5b | 2767 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
ac76c05b | 2768 | sym_name(&policydb, SYM_BOOLS, i), |
af601e46 SG |
2769 | !!values[i], |
2770 | policydb.bool_val_to_struct[i]->state, | |
581abc09 | 2771 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 2772 | audit_get_sessionid(current)); |
af601e46 | 2773 | } |
5d55a345 | 2774 | if (values[i]) |
1da177e4 | 2775 | policydb.bool_val_to_struct[i]->state = 1; |
5d55a345 | 2776 | else |
1da177e4 | 2777 | policydb.bool_val_to_struct[i]->state = 0; |
1da177e4 | 2778 | } |
1da177e4 | 2779 | |
dbc74c65 | 2780 | for (cur = policydb.cond_list; cur; cur = cur->next) { |
1da177e4 LT |
2781 | rc = evaluate_cond_node(&policydb, cur); |
2782 | if (rc) | |
2783 | goto out; | |
2784 | } | |
2785 | ||
2786 | seqno = ++latest_granting; | |
4b02b524 | 2787 | rc = 0; |
1da177e4 | 2788 | out: |
0804d113 | 2789 | write_unlock_irq(&policy_rwlock); |
1da177e4 LT |
2790 | if (!rc) { |
2791 | avc_ss_reset(seqno); | |
2792 | selnl_notify_policyload(seqno); | |
11904167 | 2793 | selinux_status_update_policyload(seqno); |
342a0cff | 2794 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2795 | } |
2796 | return rc; | |
2797 | } | |
2798 | ||
0fd71a62 | 2799 | int security_get_bool_value(int index) |
1da177e4 | 2800 | { |
4b02b524 | 2801 | int rc; |
1da177e4 LT |
2802 | int len; |
2803 | ||
0804d113 | 2804 | read_lock(&policy_rwlock); |
1da177e4 | 2805 | |
4b02b524 | 2806 | rc = -EFAULT; |
1da177e4 | 2807 | len = policydb.p_bools.nprim; |
0fd71a62 | 2808 | if (index >= len) |
1da177e4 | 2809 | goto out; |
1da177e4 | 2810 | |
0fd71a62 | 2811 | rc = policydb.bool_val_to_struct[index]->state; |
1da177e4 | 2812 | out: |
0804d113 | 2813 | read_unlock(&policy_rwlock); |
1da177e4 LT |
2814 | return rc; |
2815 | } | |
376bd9cb | 2816 | |
e900a7d9 SS |
2817 | static int security_preserve_bools(struct policydb *p) |
2818 | { | |
2819 | int rc, nbools = 0, *bvalues = NULL, i; | |
2820 | char **bnames = NULL; | |
2821 | struct cond_bool_datum *booldatum; | |
2822 | struct cond_node *cur; | |
2823 | ||
2824 | rc = security_get_bools(&nbools, &bnames, &bvalues); | |
2825 | if (rc) | |
2826 | goto out; | |
2827 | for (i = 0; i < nbools; i++) { | |
2828 | booldatum = hashtab_search(p->p_bools.table, bnames[i]); | |
2829 | if (booldatum) | |
2830 | booldatum->state = bvalues[i]; | |
2831 | } | |
dbc74c65 | 2832 | for (cur = p->cond_list; cur; cur = cur->next) { |
e900a7d9 SS |
2833 | rc = evaluate_cond_node(p, cur); |
2834 | if (rc) | |
2835 | goto out; | |
2836 | } | |
2837 | ||
2838 | out: | |
2839 | if (bnames) { | |
2840 | for (i = 0; i < nbools; i++) | |
2841 | kfree(bnames[i]); | |
2842 | } | |
2843 | kfree(bnames); | |
2844 | kfree(bvalues); | |
2845 | return rc; | |
2846 | } | |
2847 | ||
08554d6b VY |
2848 | /* |
2849 | * security_sid_mls_copy() - computes a new sid based on the given | |
2850 | * sid and the mls portion of mls_sid. | |
2851 | */ | |
2852 | int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid) | |
2853 | { | |
2854 | struct context *context1; | |
2855 | struct context *context2; | |
2856 | struct context newcon; | |
2857 | char *s; | |
2858 | u32 len; | |
4b02b524 | 2859 | int rc; |
08554d6b | 2860 | |
4b02b524 | 2861 | rc = 0; |
0719aaf5 | 2862 | if (!ss_initialized || !policydb.mls_enabled) { |
08554d6b VY |
2863 | *new_sid = sid; |
2864 | goto out; | |
2865 | } | |
2866 | ||
2867 | context_init(&newcon); | |
2868 | ||
0804d113 | 2869 | read_lock(&policy_rwlock); |
4b02b524 EP |
2870 | |
2871 | rc = -EINVAL; | |
08554d6b VY |
2872 | context1 = sidtab_search(&sidtab, sid); |
2873 | if (!context1) { | |
744ba35e EP |
2874 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2875 | __func__, sid); | |
08554d6b VY |
2876 | goto out_unlock; |
2877 | } | |
2878 | ||
4b02b524 | 2879 | rc = -EINVAL; |
08554d6b VY |
2880 | context2 = sidtab_search(&sidtab, mls_sid); |
2881 | if (!context2) { | |
744ba35e EP |
2882 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2883 | __func__, mls_sid); | |
08554d6b VY |
2884 | goto out_unlock; |
2885 | } | |
2886 | ||
2887 | newcon.user = context1->user; | |
2888 | newcon.role = context1->role; | |
2889 | newcon.type = context1->type; | |
0efc61ea | 2890 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
2891 | if (rc) |
2892 | goto out_unlock; | |
2893 | ||
08554d6b VY |
2894 | /* Check the validity of the new context. */ |
2895 | if (!policydb_context_isvalid(&policydb, &newcon)) { | |
2896 | rc = convert_context_handle_invalid_context(&newcon); | |
4b02b524 EP |
2897 | if (rc) { |
2898 | if (!context_struct_to_string(&newcon, &s, &len)) { | |
4093a844 RGB |
2899 | audit_log(current->audit_context, |
2900 | GFP_ATOMIC, AUDIT_SELINUX_ERR, | |
2901 | "op=security_sid_mls_copy " | |
2902 | "invalid_context=%s", s); | |
4b02b524 EP |
2903 | kfree(s); |
2904 | } | |
2905 | goto out_unlock; | |
2906 | } | |
08554d6b VY |
2907 | } |
2908 | ||
2909 | rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid); | |
08554d6b | 2910 | out_unlock: |
0804d113 | 2911 | read_unlock(&policy_rwlock); |
08554d6b VY |
2912 | context_destroy(&newcon); |
2913 | out: | |
2914 | return rc; | |
2915 | } | |
2916 | ||
220deb96 PM |
2917 | /** |
2918 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
2919 | * @nlbl_sid: NetLabel SID | |
2920 | * @nlbl_type: NetLabel labeling protocol type | |
2921 | * @xfrm_sid: XFRM SID | |
2922 | * | |
2923 | * Description: | |
2924 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
2925 | * resolved into a single SID it is returned via @peer_sid and the function | |
2926 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
2927 | * returns a negative value. A table summarizing the behavior is below: | |
2928 | * | |
2929 | * | function return | @sid | |
2930 | * ------------------------------+-----------------+----------------- | |
2931 | * no peer labels | 0 | SECSID_NULL | |
2932 | * single peer label | 0 | <peer_label> | |
2933 | * multiple, consistent labels | 0 | <peer_label> | |
2934 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
2935 | * | |
2936 | */ | |
2937 | int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, | |
2938 | u32 xfrm_sid, | |
2939 | u32 *peer_sid) | |
2940 | { | |
2941 | int rc; | |
2942 | struct context *nlbl_ctx; | |
2943 | struct context *xfrm_ctx; | |
2944 | ||
4b02b524 EP |
2945 | *peer_sid = SECSID_NULL; |
2946 | ||
220deb96 PM |
2947 | /* handle the common (which also happens to be the set of easy) cases |
2948 | * right away, these two if statements catch everything involving a | |
2949 | * single or absent peer SID/label */ | |
2950 | if (xfrm_sid == SECSID_NULL) { | |
2951 | *peer_sid = nlbl_sid; | |
2952 | return 0; | |
2953 | } | |
2954 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
2955 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
2956 | * is present */ | |
2957 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
2958 | *peer_sid = xfrm_sid; | |
2959 | return 0; | |
2960 | } | |
2961 | ||
2962 | /* we don't need to check ss_initialized here since the only way both | |
2963 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the | |
2964 | * security server was initialized and ss_initialized was true */ | |
4b02b524 | 2965 | if (!policydb.mls_enabled) |
220deb96 | 2966 | return 0; |
220deb96 | 2967 | |
0804d113 | 2968 | read_lock(&policy_rwlock); |
220deb96 | 2969 | |
4b02b524 | 2970 | rc = -EINVAL; |
220deb96 PM |
2971 | nlbl_ctx = sidtab_search(&sidtab, nlbl_sid); |
2972 | if (!nlbl_ctx) { | |
744ba35e EP |
2973 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2974 | __func__, nlbl_sid); | |
4b02b524 | 2975 | goto out; |
220deb96 | 2976 | } |
4b02b524 | 2977 | rc = -EINVAL; |
220deb96 PM |
2978 | xfrm_ctx = sidtab_search(&sidtab, xfrm_sid); |
2979 | if (!xfrm_ctx) { | |
744ba35e EP |
2980 | printk(KERN_ERR "SELinux: %s: unrecognized SID %d\n", |
2981 | __func__, xfrm_sid); | |
4b02b524 | 2982 | goto out; |
220deb96 PM |
2983 | } |
2984 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
4b02b524 EP |
2985 | if (rc) |
2986 | goto out; | |
220deb96 | 2987 | |
4b02b524 EP |
2988 | /* at present NetLabel SIDs/labels really only carry MLS |
2989 | * information so if the MLS portion of the NetLabel SID | |
2990 | * matches the MLS portion of the labeled XFRM SID/label | |
2991 | * then pass along the XFRM SID as it is the most | |
2992 | * expressive */ | |
2993 | *peer_sid = xfrm_sid; | |
2994 | out: | |
0804d113 | 2995 | read_unlock(&policy_rwlock); |
220deb96 PM |
2996 | return rc; |
2997 | } | |
2998 | ||
55fcf09b CP |
2999 | static int get_classes_callback(void *k, void *d, void *args) |
3000 | { | |
3001 | struct class_datum *datum = d; | |
3002 | char *name = k, **classes = args; | |
3003 | int value = datum->value - 1; | |
3004 | ||
3005 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
3006 | if (!classes[value]) | |
3007 | return -ENOMEM; | |
3008 | ||
3009 | return 0; | |
3010 | } | |
3011 | ||
3012 | int security_get_classes(char ***classes, int *nclasses) | |
3013 | { | |
4b02b524 | 3014 | int rc; |
55fcf09b | 3015 | |
0804d113 | 3016 | read_lock(&policy_rwlock); |
55fcf09b | 3017 | |
4b02b524 | 3018 | rc = -ENOMEM; |
55fcf09b | 3019 | *nclasses = policydb.p_classes.nprim; |
9f59f90b | 3020 | *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC); |
55fcf09b CP |
3021 | if (!*classes) |
3022 | goto out; | |
3023 | ||
3024 | rc = hashtab_map(policydb.p_classes.table, get_classes_callback, | |
3025 | *classes); | |
4b02b524 | 3026 | if (rc) { |
55fcf09b CP |
3027 | int i; |
3028 | for (i = 0; i < *nclasses; i++) | |
3029 | kfree((*classes)[i]); | |
3030 | kfree(*classes); | |
3031 | } | |
3032 | ||
3033 | out: | |
0804d113 | 3034 | read_unlock(&policy_rwlock); |
55fcf09b CP |
3035 | return rc; |
3036 | } | |
3037 | ||
3038 | static int get_permissions_callback(void *k, void *d, void *args) | |
3039 | { | |
3040 | struct perm_datum *datum = d; | |
3041 | char *name = k, **perms = args; | |
3042 | int value = datum->value - 1; | |
3043 | ||
3044 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
3045 | if (!perms[value]) | |
3046 | return -ENOMEM; | |
3047 | ||
3048 | return 0; | |
3049 | } | |
3050 | ||
3051 | int security_get_permissions(char *class, char ***perms, int *nperms) | |
3052 | { | |
4b02b524 | 3053 | int rc, i; |
55fcf09b CP |
3054 | struct class_datum *match; |
3055 | ||
0804d113 | 3056 | read_lock(&policy_rwlock); |
55fcf09b | 3057 | |
4b02b524 | 3058 | rc = -EINVAL; |
55fcf09b CP |
3059 | match = hashtab_search(policydb.p_classes.table, class); |
3060 | if (!match) { | |
744ba35e | 3061 | printk(KERN_ERR "SELinux: %s: unrecognized class %s\n", |
dd6f953a | 3062 | __func__, class); |
55fcf09b CP |
3063 | goto out; |
3064 | } | |
3065 | ||
4b02b524 | 3066 | rc = -ENOMEM; |
55fcf09b | 3067 | *nperms = match->permissions.nprim; |
9f59f90b | 3068 | *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC); |
55fcf09b CP |
3069 | if (!*perms) |
3070 | goto out; | |
3071 | ||
3072 | if (match->comdatum) { | |
3073 | rc = hashtab_map(match->comdatum->permissions.table, | |
3074 | get_permissions_callback, *perms); | |
4b02b524 | 3075 | if (rc) |
55fcf09b CP |
3076 | goto err; |
3077 | } | |
3078 | ||
3079 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
3080 | *perms); | |
4b02b524 | 3081 | if (rc) |
55fcf09b CP |
3082 | goto err; |
3083 | ||
3084 | out: | |
0804d113 | 3085 | read_unlock(&policy_rwlock); |
55fcf09b CP |
3086 | return rc; |
3087 | ||
3088 | err: | |
0804d113 | 3089 | read_unlock(&policy_rwlock); |
55fcf09b CP |
3090 | for (i = 0; i < *nperms; i++) |
3091 | kfree((*perms)[i]); | |
3092 | kfree(*perms); | |
3093 | return rc; | |
3094 | } | |
3095 | ||
3f12070e EP |
3096 | int security_get_reject_unknown(void) |
3097 | { | |
3098 | return policydb.reject_unknown; | |
3099 | } | |
3100 | ||
3101 | int security_get_allow_unknown(void) | |
3102 | { | |
3103 | return policydb.allow_unknown; | |
3104 | } | |
3105 | ||
3bb56b25 PM |
3106 | /** |
3107 | * security_policycap_supported - Check for a specific policy capability | |
3108 | * @req_cap: capability | |
3109 | * | |
3110 | * Description: | |
3111 | * This function queries the currently loaded policy to see if it supports the | |
3112 | * capability specified by @req_cap. Returns true (1) if the capability is | |
3113 | * supported, false (0) if it isn't supported. | |
3114 | * | |
3115 | */ | |
3116 | int security_policycap_supported(unsigned int req_cap) | |
3117 | { | |
3118 | int rc; | |
3119 | ||
0804d113 | 3120 | read_lock(&policy_rwlock); |
3bb56b25 | 3121 | rc = ebitmap_get_bit(&policydb.policycaps, req_cap); |
0804d113 | 3122 | read_unlock(&policy_rwlock); |
3bb56b25 PM |
3123 | |
3124 | return rc; | |
3125 | } | |
3126 | ||
376bd9cb DG |
3127 | struct selinux_audit_rule { |
3128 | u32 au_seqno; | |
3129 | struct context au_ctxt; | |
3130 | }; | |
3131 | ||
9d57a7f9 | 3132 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 3133 | { |
9d57a7f9 AD |
3134 | struct selinux_audit_rule *rule = vrule; |
3135 | ||
376bd9cb DG |
3136 | if (rule) { |
3137 | context_destroy(&rule->au_ctxt); | |
3138 | kfree(rule); | |
3139 | } | |
3140 | } | |
3141 | ||
9d57a7f9 | 3142 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb DG |
3143 | { |
3144 | struct selinux_audit_rule *tmprule; | |
3145 | struct role_datum *roledatum; | |
3146 | struct type_datum *typedatum; | |
3147 | struct user_datum *userdatum; | |
9d57a7f9 | 3148 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
3149 | int rc = 0; |
3150 | ||
3151 | *rule = NULL; | |
3152 | ||
3153 | if (!ss_initialized) | |
3ad40d64 | 3154 | return -EOPNOTSUPP; |
376bd9cb DG |
3155 | |
3156 | switch (field) { | |
3a6b9f85 DG |
3157 | case AUDIT_SUBJ_USER: |
3158 | case AUDIT_SUBJ_ROLE: | |
3159 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
3160 | case AUDIT_OBJ_USER: |
3161 | case AUDIT_OBJ_ROLE: | |
3162 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 3163 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 3164 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
3165 | return -EINVAL; |
3166 | break; | |
3a6b9f85 DG |
3167 | case AUDIT_SUBJ_SEN: |
3168 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3169 | case AUDIT_OBJ_LEV_LOW: |
3170 | case AUDIT_OBJ_LEV_HIGH: | |
25985edc | 3171 | /* we do not allow a range, indicated by the presence of '-' */ |
376bd9cb DG |
3172 | if (strchr(rulestr, '-')) |
3173 | return -EINVAL; | |
3174 | break; | |
3175 | default: | |
3176 | /* only the above fields are valid */ | |
3177 | return -EINVAL; | |
3178 | } | |
3179 | ||
3180 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
3181 | if (!tmprule) | |
3182 | return -ENOMEM; | |
3183 | ||
3184 | context_init(&tmprule->au_ctxt); | |
3185 | ||
0804d113 | 3186 | read_lock(&policy_rwlock); |
376bd9cb DG |
3187 | |
3188 | tmprule->au_seqno = latest_granting; | |
3189 | ||
3190 | switch (field) { | |
3a6b9f85 | 3191 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 3192 | case AUDIT_OBJ_USER: |
4b02b524 | 3193 | rc = -EINVAL; |
376bd9cb DG |
3194 | userdatum = hashtab_search(policydb.p_users.table, rulestr); |
3195 | if (!userdatum) | |
4b02b524 EP |
3196 | goto out; |
3197 | tmprule->au_ctxt.user = userdatum->value; | |
376bd9cb | 3198 | break; |
3a6b9f85 | 3199 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 3200 | case AUDIT_OBJ_ROLE: |
4b02b524 | 3201 | rc = -EINVAL; |
376bd9cb DG |
3202 | roledatum = hashtab_search(policydb.p_roles.table, rulestr); |
3203 | if (!roledatum) | |
4b02b524 EP |
3204 | goto out; |
3205 | tmprule->au_ctxt.role = roledatum->value; | |
376bd9cb | 3206 | break; |
3a6b9f85 | 3207 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 3208 | case AUDIT_OBJ_TYPE: |
4b02b524 | 3209 | rc = -EINVAL; |
376bd9cb DG |
3210 | typedatum = hashtab_search(policydb.p_types.table, rulestr); |
3211 | if (!typedatum) | |
4b02b524 EP |
3212 | goto out; |
3213 | tmprule->au_ctxt.type = typedatum->value; | |
376bd9cb | 3214 | break; |
3a6b9f85 DG |
3215 | case AUDIT_SUBJ_SEN: |
3216 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3217 | case AUDIT_OBJ_LEV_LOW: |
3218 | case AUDIT_OBJ_LEV_HIGH: | |
376bd9cb | 3219 | rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC); |
4b02b524 EP |
3220 | if (rc) |
3221 | goto out; | |
376bd9cb DG |
3222 | break; |
3223 | } | |
4b02b524 EP |
3224 | rc = 0; |
3225 | out: | |
0804d113 | 3226 | read_unlock(&policy_rwlock); |
376bd9cb DG |
3227 | |
3228 | if (rc) { | |
3229 | selinux_audit_rule_free(tmprule); | |
3230 | tmprule = NULL; | |
3231 | } | |
3232 | ||
3233 | *rule = tmprule; | |
3234 | ||
3235 | return rc; | |
3236 | } | |
3237 | ||
9d57a7f9 AD |
3238 | /* Check to see if the rule contains any selinux fields */ |
3239 | int selinux_audit_rule_known(struct audit_krule *rule) | |
3240 | { | |
3241 | int i; | |
3242 | ||
3243 | for (i = 0; i < rule->field_count; i++) { | |
3244 | struct audit_field *f = &rule->fields[i]; | |
3245 | switch (f->type) { | |
3246 | case AUDIT_SUBJ_USER: | |
3247 | case AUDIT_SUBJ_ROLE: | |
3248 | case AUDIT_SUBJ_TYPE: | |
3249 | case AUDIT_SUBJ_SEN: | |
3250 | case AUDIT_SUBJ_CLR: | |
3251 | case AUDIT_OBJ_USER: | |
3252 | case AUDIT_OBJ_ROLE: | |
3253 | case AUDIT_OBJ_TYPE: | |
3254 | case AUDIT_OBJ_LEV_LOW: | |
3255 | case AUDIT_OBJ_LEV_HIGH: | |
3256 | return 1; | |
3257 | } | |
3258 | } | |
3259 | ||
3260 | return 0; | |
3261 | } | |
3262 | ||
3263 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, | |
f5269710 | 3264 | struct audit_context *actx) |
376bd9cb DG |
3265 | { |
3266 | struct context *ctxt; | |
3267 | struct mls_level *level; | |
9d57a7f9 | 3268 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
3269 | int match = 0; |
3270 | ||
9ad42a79 RGB |
3271 | if (unlikely(!rule)) { |
3272 | WARN_ONCE(1, "selinux_audit_rule_match: missing rule\n"); | |
376bd9cb DG |
3273 | return -ENOENT; |
3274 | } | |
3275 | ||
0804d113 | 3276 | read_lock(&policy_rwlock); |
376bd9cb DG |
3277 | |
3278 | if (rule->au_seqno < latest_granting) { | |
376bd9cb DG |
3279 | match = -ESTALE; |
3280 | goto out; | |
3281 | } | |
3282 | ||
9a2f44f0 | 3283 | ctxt = sidtab_search(&sidtab, sid); |
9ad42a79 RGB |
3284 | if (unlikely(!ctxt)) { |
3285 | WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n", | |
5d55a345 | 3286 | sid); |
376bd9cb DG |
3287 | match = -ENOENT; |
3288 | goto out; | |
3289 | } | |
3290 | ||
3291 | /* a field/op pair that is not caught here will simply fall through | |
3292 | without a match */ | |
3293 | switch (field) { | |
3a6b9f85 | 3294 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 3295 | case AUDIT_OBJ_USER: |
376bd9cb | 3296 | switch (op) { |
5af75d8d | 3297 | case Audit_equal: |
376bd9cb DG |
3298 | match = (ctxt->user == rule->au_ctxt.user); |
3299 | break; | |
5af75d8d | 3300 | case Audit_not_equal: |
376bd9cb DG |
3301 | match = (ctxt->user != rule->au_ctxt.user); |
3302 | break; | |
3303 | } | |
3304 | break; | |
3a6b9f85 | 3305 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 3306 | case AUDIT_OBJ_ROLE: |
376bd9cb | 3307 | switch (op) { |
5af75d8d | 3308 | case Audit_equal: |
376bd9cb DG |
3309 | match = (ctxt->role == rule->au_ctxt.role); |
3310 | break; | |
5af75d8d | 3311 | case Audit_not_equal: |
376bd9cb DG |
3312 | match = (ctxt->role != rule->au_ctxt.role); |
3313 | break; | |
3314 | } | |
3315 | break; | |
3a6b9f85 | 3316 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 3317 | case AUDIT_OBJ_TYPE: |
376bd9cb | 3318 | switch (op) { |
5af75d8d | 3319 | case Audit_equal: |
376bd9cb DG |
3320 | match = (ctxt->type == rule->au_ctxt.type); |
3321 | break; | |
5af75d8d | 3322 | case Audit_not_equal: |
376bd9cb DG |
3323 | match = (ctxt->type != rule->au_ctxt.type); |
3324 | break; | |
3325 | } | |
3326 | break; | |
3a6b9f85 DG |
3327 | case AUDIT_SUBJ_SEN: |
3328 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3329 | case AUDIT_OBJ_LEV_LOW: |
3330 | case AUDIT_OBJ_LEV_HIGH: | |
3331 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
3332 | field == AUDIT_OBJ_LEV_LOW) ? |
3333 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 3334 | switch (op) { |
5af75d8d | 3335 | case Audit_equal: |
376bd9cb | 3336 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3337 | level); |
376bd9cb | 3338 | break; |
5af75d8d | 3339 | case Audit_not_equal: |
376bd9cb | 3340 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3341 | level); |
376bd9cb | 3342 | break; |
5af75d8d | 3343 | case Audit_lt: |
376bd9cb | 3344 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
3345 | level) && |
3346 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
3347 | level)); | |
376bd9cb | 3348 | break; |
5af75d8d | 3349 | case Audit_le: |
376bd9cb | 3350 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 3351 | level); |
376bd9cb | 3352 | break; |
5af75d8d | 3353 | case Audit_gt: |
376bd9cb | 3354 | match = (mls_level_dom(level, |
5d55a345 EP |
3355 | &rule->au_ctxt.range.level[0]) && |
3356 | !mls_level_eq(level, | |
3357 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 3358 | break; |
5af75d8d | 3359 | case Audit_ge: |
376bd9cb | 3360 | match = mls_level_dom(level, |
5d55a345 | 3361 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
3362 | break; |
3363 | } | |
3364 | } | |
3365 | ||
3366 | out: | |
0804d113 | 3367 | read_unlock(&policy_rwlock); |
376bd9cb DG |
3368 | return match; |
3369 | } | |
3370 | ||
9d57a7f9 | 3371 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb | 3372 | |
562c99f2 | 3373 | static int aurule_avc_callback(u32 event) |
376bd9cb DG |
3374 | { |
3375 | int err = 0; | |
3376 | ||
3377 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
3378 | err = aurule_callback(); | |
3379 | return err; | |
3380 | } | |
3381 | ||
3382 | static int __init aurule_init(void) | |
3383 | { | |
3384 | int err; | |
3385 | ||
562c99f2 | 3386 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET); |
376bd9cb DG |
3387 | if (err) |
3388 | panic("avc_add_callback() failed, error %d\n", err); | |
3389 | ||
3390 | return err; | |
3391 | } | |
3392 | __initcall(aurule_init); | |
3393 | ||
7420ed23 | 3394 | #ifdef CONFIG_NETLABEL |
7420ed23 | 3395 | /** |
5778eabd PM |
3396 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
3397 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 3398 | * @sid: the SELinux SID |
7420ed23 VY |
3399 | * |
3400 | * Description: | |
3401 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
3402 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
3403 | * already been initialized. | |
7420ed23 VY |
3404 | * |
3405 | */ | |
5778eabd | 3406 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 3407 | u32 sid) |
7420ed23 | 3408 | { |
5dbe1eb0 | 3409 | u32 *sid_cache; |
7420ed23 | 3410 | |
5dbe1eb0 PM |
3411 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
3412 | if (sid_cache == NULL) | |
5778eabd | 3413 | return; |
5dbe1eb0 PM |
3414 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
3415 | if (secattr->cache == NULL) { | |
3416 | kfree(sid_cache); | |
5778eabd | 3417 | return; |
0ec8abd7 | 3418 | } |
7420ed23 | 3419 | |
5dbe1eb0 PM |
3420 | *sid_cache = sid; |
3421 | secattr->cache->free = kfree; | |
3422 | secattr->cache->data = sid_cache; | |
5778eabd | 3423 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
3424 | } |
3425 | ||
3426 | /** | |
5778eabd | 3427 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 3428 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
3429 | * @sid: the SELinux SID |
3430 | * | |
3431 | * Description: | |
5778eabd | 3432 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 3433 | * SELinux SID. If the @secattr field does not contain a full SELinux |
25985edc | 3434 | * SID/context then use SECINITSID_NETMSG as the foundation. If possible the |
5dbe1eb0 PM |
3435 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to |
3436 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
3437 | * conversion for future lookups. Returns zero on success, negative values on | |
3438 | * failure. | |
7420ed23 VY |
3439 | * |
3440 | */ | |
5778eabd | 3441 | int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, |
5778eabd | 3442 | u32 *sid) |
7420ed23 | 3443 | { |
7ae9f23c | 3444 | int rc; |
7420ed23 VY |
3445 | struct context *ctx; |
3446 | struct context ctx_new; | |
5778eabd PM |
3447 | |
3448 | if (!ss_initialized) { | |
3449 | *sid = SECSID_NULL; | |
3450 | return 0; | |
3451 | } | |
7420ed23 | 3452 | |
0804d113 | 3453 | read_lock(&policy_rwlock); |
7420ed23 | 3454 | |
7ae9f23c | 3455 | if (secattr->flags & NETLBL_SECATTR_CACHE) |
5dbe1eb0 | 3456 | *sid = *(u32 *)secattr->cache->data; |
7ae9f23c | 3457 | else if (secattr->flags & NETLBL_SECATTR_SECID) |
16efd454 | 3458 | *sid = secattr->attr.secid; |
7ae9f23c EP |
3459 | else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
3460 | rc = -EIDRM; | |
5dbe1eb0 | 3461 | ctx = sidtab_search(&sidtab, SECINITSID_NETMSG); |
7420ed23 | 3462 | if (ctx == NULL) |
7ae9f23c | 3463 | goto out; |
7420ed23 | 3464 | |
81990fbd | 3465 | context_init(&ctx_new); |
7420ed23 VY |
3466 | ctx_new.user = ctx->user; |
3467 | ctx_new.role = ctx->role; | |
3468 | ctx_new.type = ctx->type; | |
02752760 | 3469 | mls_import_netlbl_lvl(&ctx_new, secattr); |
701a90ba | 3470 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
da8026fa | 3471 | rc = mls_import_netlbl_cat(&ctx_new, secattr); |
7ae9f23c EP |
3472 | if (rc) |
3473 | goto out; | |
7420ed23 | 3474 | } |
7ae9f23c EP |
3475 | rc = -EIDRM; |
3476 | if (!mls_context_isvalid(&policydb, &ctx_new)) | |
3477 | goto out_free; | |
7420ed23 VY |
3478 | |
3479 | rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid); | |
7ae9f23c EP |
3480 | if (rc) |
3481 | goto out_free; | |
7420ed23 | 3482 | |
5dbe1eb0 | 3483 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 3484 | |
7420ed23 | 3485 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c | 3486 | } else |
388b2405 | 3487 | *sid = SECSID_NULL; |
7420ed23 | 3488 | |
0804d113 | 3489 | read_unlock(&policy_rwlock); |
7ae9f23c EP |
3490 | return 0; |
3491 | out_free: | |
7420ed23 | 3492 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c EP |
3493 | out: |
3494 | read_unlock(&policy_rwlock); | |
3495 | return rc; | |
7420ed23 VY |
3496 | } |
3497 | ||
3498 | /** | |
5778eabd PM |
3499 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
3500 | * @sid: the SELinux SID | |
3501 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
3502 | * |
3503 | * Description: | |
5778eabd PM |
3504 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
3505 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
3506 | * |
3507 | */ | |
5778eabd | 3508 | int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) |
7420ed23 | 3509 | { |
99d854d2 | 3510 | int rc; |
7420ed23 VY |
3511 | struct context *ctx; |
3512 | ||
3513 | if (!ss_initialized) | |
3514 | return 0; | |
3515 | ||
0804d113 | 3516 | read_lock(&policy_rwlock); |
4b02b524 EP |
3517 | |
3518 | rc = -ENOENT; | |
7420ed23 | 3519 | ctx = sidtab_search(&sidtab, sid); |
4b02b524 EP |
3520 | if (ctx == NULL) |
3521 | goto out; | |
3522 | ||
3523 | rc = -ENOMEM; | |
ac76c05b | 3524 | secattr->domain = kstrdup(sym_name(&policydb, SYM_TYPES, ctx->type - 1), |
5778eabd | 3525 | GFP_ATOMIC); |
4b02b524 EP |
3526 | if (secattr->domain == NULL) |
3527 | goto out; | |
3528 | ||
8d75899d PM |
3529 | secattr->attr.secid = sid; |
3530 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
5778eabd PM |
3531 | mls_export_netlbl_lvl(ctx, secattr); |
3532 | rc = mls_export_netlbl_cat(ctx, secattr); | |
4b02b524 | 3533 | out: |
0804d113 | 3534 | read_unlock(&policy_rwlock); |
f8687afe PM |
3535 | return rc; |
3536 | } | |
7420ed23 | 3537 | #endif /* CONFIG_NETLABEL */ |
cee74f47 EP |
3538 | |
3539 | /** | |
3540 | * security_read_policy - read the policy. | |
3541 | * @data: binary policy data | |
3542 | * @len: length of data in bytes | |
3543 | * | |
3544 | */ | |
6b697323 | 3545 | int security_read_policy(void **data, size_t *len) |
cee74f47 EP |
3546 | { |
3547 | int rc; | |
3548 | struct policy_file fp; | |
3549 | ||
3550 | if (!ss_initialized) | |
3551 | return -EINVAL; | |
3552 | ||
3553 | *len = security_policydb_len(); | |
3554 | ||
845ca30f | 3555 | *data = vmalloc_user(*len); |
cee74f47 EP |
3556 | if (!*data) |
3557 | return -ENOMEM; | |
3558 | ||
3559 | fp.data = *data; | |
3560 | fp.len = *len; | |
3561 | ||
3562 | read_lock(&policy_rwlock); | |
3563 | rc = policydb_write(&policydb, &fp); | |
3564 | read_unlock(&policy_rwlock); | |
3565 | ||
3566 | if (rc) | |
3567 | return rc; | |
3568 | ||
3569 | *len = (unsigned long)fp.data - (unsigned long)*data; | |
3570 | return 0; | |
3571 | ||
3572 | } |