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Commit | Line | Data |
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a10e763b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Implementation of the security services. | |
4 | * | |
7efbb60b | 5 | * Authors : Stephen Smalley, <sds@tycho.nsa.gov> |
5d55a345 | 6 | * James Morris <jmorris@redhat.com> |
1da177e4 LT |
7 | * |
8 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> | |
9 | * | |
10 | * Support for enhanced MLS infrastructure. | |
376bd9cb | 11 | * Support for context based audit filters. |
1da177e4 LT |
12 | * |
13 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> | |
14 | * | |
5d55a345 | 15 | * Added conditional policy language extensions |
1da177e4 | 16 | * |
82c21bfa | 17 | * Updated: Hewlett-Packard <paul@paul-moore.com> |
7420ed23 VY |
18 | * |
19 | * Added support for NetLabel | |
3bb56b25 | 20 | * Added support for the policy capability bitmap |
7420ed23 | 21 | * |
b94c7e67 CS |
22 | * Updated: Chad Sellers <csellers@tresys.com> |
23 | * | |
24 | * Added validation of kernel classes and permissions | |
25 | * | |
44c2d9bd KK |
26 | * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com> |
27 | * | |
28 | * Added support for bounds domain and audit messaged on masked permissions | |
29 | * | |
0719aaf5 GT |
30 | * Updated: Guido Trentalancia <guido@trentalancia.com> |
31 | * | |
32 | * Added support for runtime switching of the policy type | |
33 | * | |
44c2d9bd | 34 | * Copyright (C) 2008, 2009 NEC Corporation |
3bb56b25 | 35 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
376bd9cb | 36 | * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
b94c7e67 | 37 | * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC |
1da177e4 | 38 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
1da177e4 LT |
39 | */ |
40 | #include <linux/kernel.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/string.h> | |
43 | #include <linux/spinlock.h> | |
9f2ad665 | 44 | #include <linux/rcupdate.h> |
1da177e4 LT |
45 | #include <linux/errno.h> |
46 | #include <linux/in.h> | |
47 | #include <linux/sched.h> | |
48 | #include <linux/audit.h> | |
bb003079 | 49 | #include <linux/mutex.h> |
f0d3d989 | 50 | #include <linux/vmalloc.h> |
7420ed23 | 51 | #include <net/netlabel.h> |
bb003079 | 52 | |
1da177e4 LT |
53 | #include "flask.h" |
54 | #include "avc.h" | |
55 | #include "avc_ss.h" | |
56 | #include "security.h" | |
57 | #include "context.h" | |
58 | #include "policydb.h" | |
59 | #include "sidtab.h" | |
60 | #include "services.h" | |
61 | #include "conditional.h" | |
62 | #include "mls.h" | |
7420ed23 | 63 | #include "objsec.h" |
c60475bf | 64 | #include "netlabel.h" |
3de4bab5 | 65 | #include "xfrm.h" |
02752760 | 66 | #include "ebitmap.h" |
9d57a7f9 | 67 | #include "audit.h" |
1da177e4 | 68 | |
4dc2fce3 | 69 | /* Policy capability names */ |
89f5bebc | 70 | const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX] = { |
4dc2fce3 SS |
71 | "network_peer_controls", |
72 | "open_perms", | |
73 | "extended_socket_class", | |
74 | "always_check_network", | |
af63f419 SS |
75 | "cgroup_seclabel", |
76 | "nnp_nosuid_transition" | |
4dc2fce3 SS |
77 | }; |
78 | ||
aa8e712c | 79 | static struct selinux_ss selinux_ss; |
3bb56b25 | 80 | |
aa8e712c SS |
81 | void selinux_ss_init(struct selinux_ss **ss) |
82 | { | |
83 | rwlock_init(&selinux_ss.policy_rwlock); | |
84 | mutex_init(&selinux_ss.status_lock); | |
85 | *ss = &selinux_ss; | |
86 | } | |
1da177e4 LT |
87 | |
88 | /* Forward declaration. */ | |
aa8e712c SS |
89 | static int context_struct_to_string(struct policydb *policydb, |
90 | struct context *context, | |
91 | char **scontext, | |
1da177e4 LT |
92 | u32 *scontext_len); |
93 | ||
d97bd23c OM |
94 | static int sidtab_entry_to_string(struct policydb *policydb, |
95 | struct sidtab *sidtab, | |
96 | struct sidtab_entry *entry, | |
97 | char **scontext, | |
98 | u32 *scontext_len); | |
99 | ||
aa8e712c SS |
100 | static void context_struct_compute_av(struct policydb *policydb, |
101 | struct context *scontext, | |
102 | struct context *tcontext, | |
103 | u16 tclass, | |
104 | struct av_decision *avd, | |
105 | struct extended_perms *xperms); | |
c6d3aaa4 SS |
106 | |
107 | static int selinux_set_mapping(struct policydb *pol, | |
108 | struct security_class_mapping *map, | |
aa8e712c | 109 | struct selinux_map *out_map) |
c6d3aaa4 | 110 | { |
c6d3aaa4 SS |
111 | u16 i, j; |
112 | unsigned k; | |
113 | bool print_unknown_handle = false; | |
114 | ||
115 | /* Find number of classes in the input mapping */ | |
116 | if (!map) | |
117 | return -EINVAL; | |
118 | i = 0; | |
119 | while (map[i].name) | |
120 | i++; | |
121 | ||
122 | /* Allocate space for the class records, plus one for class zero */ | |
aa8e712c SS |
123 | out_map->mapping = kcalloc(++i, sizeof(*out_map->mapping), GFP_ATOMIC); |
124 | if (!out_map->mapping) | |
c6d3aaa4 SS |
125 | return -ENOMEM; |
126 | ||
127 | /* Store the raw class and permission values */ | |
128 | j = 0; | |
129 | while (map[j].name) { | |
130 | struct security_class_mapping *p_in = map + (j++); | |
aa8e712c | 131 | struct selinux_mapping *p_out = out_map->mapping + j; |
c6d3aaa4 SS |
132 | |
133 | /* An empty class string skips ahead */ | |
134 | if (!strcmp(p_in->name, "")) { | |
135 | p_out->num_perms = 0; | |
136 | continue; | |
137 | } | |
138 | ||
139 | p_out->value = string_to_security_class(pol, p_in->name); | |
140 | if (!p_out->value) { | |
b54c85c1 | 141 | pr_info("SELinux: Class %s not defined in policy.\n", |
c6d3aaa4 SS |
142 | p_in->name); |
143 | if (pol->reject_unknown) | |
144 | goto err; | |
145 | p_out->num_perms = 0; | |
146 | print_unknown_handle = true; | |
147 | continue; | |
148 | } | |
149 | ||
150 | k = 0; | |
342e9157 | 151 | while (p_in->perms[k]) { |
c6d3aaa4 SS |
152 | /* An empty permission string skips ahead */ |
153 | if (!*p_in->perms[k]) { | |
154 | k++; | |
155 | continue; | |
156 | } | |
157 | p_out->perms[k] = string_to_av_perm(pol, p_out->value, | |
158 | p_in->perms[k]); | |
159 | if (!p_out->perms[k]) { | |
b54c85c1 | 160 | pr_info("SELinux: Permission %s in class %s not defined in policy.\n", |
c6d3aaa4 SS |
161 | p_in->perms[k], p_in->name); |
162 | if (pol->reject_unknown) | |
163 | goto err; | |
164 | print_unknown_handle = true; | |
165 | } | |
166 | ||
167 | k++; | |
168 | } | |
169 | p_out->num_perms = k; | |
170 | } | |
171 | ||
172 | if (print_unknown_handle) | |
b54c85c1 | 173 | pr_info("SELinux: the above unknown classes and permissions will be %s\n", |
c6d3aaa4 SS |
174 | pol->allow_unknown ? "allowed" : "denied"); |
175 | ||
aa8e712c | 176 | out_map->size = i; |
c6d3aaa4 SS |
177 | return 0; |
178 | err: | |
aa8e712c SS |
179 | kfree(out_map->mapping); |
180 | out_map->mapping = NULL; | |
c6d3aaa4 SS |
181 | return -EINVAL; |
182 | } | |
183 | ||
184 | /* | |
185 | * Get real, policy values from mapped values | |
186 | */ | |
187 | ||
aa8e712c | 188 | static u16 unmap_class(struct selinux_map *map, u16 tclass) |
c6d3aaa4 | 189 | { |
aa8e712c SS |
190 | if (tclass < map->size) |
191 | return map->mapping[tclass].value; | |
c6d3aaa4 SS |
192 | |
193 | return tclass; | |
194 | } | |
195 | ||
6f5317e7 HC |
196 | /* |
197 | * Get kernel value for class from its policy value | |
198 | */ | |
aa8e712c | 199 | static u16 map_class(struct selinux_map *map, u16 pol_value) |
6f5317e7 HC |
200 | { |
201 | u16 i; | |
202 | ||
aa8e712c SS |
203 | for (i = 1; i < map->size; i++) { |
204 | if (map->mapping[i].value == pol_value) | |
6f5317e7 HC |
205 | return i; |
206 | } | |
207 | ||
85cd6da5 | 208 | return SECCLASS_NULL; |
6f5317e7 HC |
209 | } |
210 | ||
aa8e712c SS |
211 | static void map_decision(struct selinux_map *map, |
212 | u16 tclass, struct av_decision *avd, | |
c6d3aaa4 SS |
213 | int allow_unknown) |
214 | { | |
aa8e712c SS |
215 | if (tclass < map->size) { |
216 | struct selinux_mapping *mapping = &map->mapping[tclass]; | |
217 | unsigned int i, n = mapping->num_perms; | |
c6d3aaa4 SS |
218 | u32 result; |
219 | ||
220 | for (i = 0, result = 0; i < n; i++) { | |
aa8e712c | 221 | if (avd->allowed & mapping->perms[i]) |
c6d3aaa4 | 222 | result |= 1<<i; |
aa8e712c | 223 | if (allow_unknown && !mapping->perms[i]) |
c6d3aaa4 SS |
224 | result |= 1<<i; |
225 | } | |
226 | avd->allowed = result; | |
227 | ||
228 | for (i = 0, result = 0; i < n; i++) | |
aa8e712c | 229 | if (avd->auditallow & mapping->perms[i]) |
c6d3aaa4 SS |
230 | result |= 1<<i; |
231 | avd->auditallow = result; | |
232 | ||
233 | for (i = 0, result = 0; i < n; i++) { | |
aa8e712c | 234 | if (avd->auditdeny & mapping->perms[i]) |
c6d3aaa4 | 235 | result |= 1<<i; |
aa8e712c | 236 | if (!allow_unknown && !mapping->perms[i]) |
c6d3aaa4 SS |
237 | result |= 1<<i; |
238 | } | |
0bce9527 EP |
239 | /* |
240 | * In case the kernel has a bug and requests a permission | |
241 | * between num_perms and the maximum permission number, we | |
242 | * should audit that denial | |
243 | */ | |
244 | for (; i < (sizeof(u32)*8); i++) | |
245 | result |= 1<<i; | |
c6d3aaa4 SS |
246 | avd->auditdeny = result; |
247 | } | |
248 | } | |
249 | ||
aa8e712c | 250 | int security_mls_enabled(struct selinux_state *state) |
0719aaf5 | 251 | { |
aa8e712c SS |
252 | struct policydb *p = &state->ss->policydb; |
253 | ||
254 | return p->mls_enabled; | |
0719aaf5 | 255 | } |
c6d3aaa4 | 256 | |
1da177e4 LT |
257 | /* |
258 | * Return the boolean value of a constraint expression | |
259 | * when it is applied to the specified source and target | |
260 | * security contexts. | |
261 | * | |
262 | * xcontext is a special beast... It is used by the validatetrans rules | |
263 | * only. For these rules, scontext is the context before the transition, | |
264 | * tcontext is the context after the transition, and xcontext is the context | |
265 | * of the process performing the transition. All other callers of | |
266 | * constraint_expr_eval should pass in NULL for xcontext. | |
267 | */ | |
aa8e712c SS |
268 | static int constraint_expr_eval(struct policydb *policydb, |
269 | struct context *scontext, | |
1da177e4 LT |
270 | struct context *tcontext, |
271 | struct context *xcontext, | |
272 | struct constraint_expr *cexpr) | |
273 | { | |
274 | u32 val1, val2; | |
275 | struct context *c; | |
276 | struct role_datum *r1, *r2; | |
277 | struct mls_level *l1, *l2; | |
278 | struct constraint_expr *e; | |
279 | int s[CEXPR_MAXDEPTH]; | |
280 | int sp = -1; | |
281 | ||
282 | for (e = cexpr; e; e = e->next) { | |
283 | switch (e->expr_type) { | |
284 | case CEXPR_NOT: | |
285 | BUG_ON(sp < 0); | |
286 | s[sp] = !s[sp]; | |
287 | break; | |
288 | case CEXPR_AND: | |
289 | BUG_ON(sp < 1); | |
290 | sp--; | |
c1a7368a | 291 | s[sp] &= s[sp + 1]; |
1da177e4 LT |
292 | break; |
293 | case CEXPR_OR: | |
294 | BUG_ON(sp < 1); | |
295 | sp--; | |
c1a7368a | 296 | s[sp] |= s[sp + 1]; |
1da177e4 LT |
297 | break; |
298 | case CEXPR_ATTR: | |
c1a7368a | 299 | if (sp == (CEXPR_MAXDEPTH - 1)) |
1da177e4 LT |
300 | return 0; |
301 | switch (e->attr) { | |
302 | case CEXPR_USER: | |
303 | val1 = scontext->user; | |
304 | val2 = tcontext->user; | |
305 | break; | |
306 | case CEXPR_TYPE: | |
307 | val1 = scontext->type; | |
308 | val2 = tcontext->type; | |
309 | break; | |
310 | case CEXPR_ROLE: | |
311 | val1 = scontext->role; | |
312 | val2 = tcontext->role; | |
aa8e712c SS |
313 | r1 = policydb->role_val_to_struct[val1 - 1]; |
314 | r2 = policydb->role_val_to_struct[val2 - 1]; | |
1da177e4 LT |
315 | switch (e->op) { |
316 | case CEXPR_DOM: | |
317 | s[++sp] = ebitmap_get_bit(&r1->dominates, | |
318 | val2 - 1); | |
319 | continue; | |
320 | case CEXPR_DOMBY: | |
321 | s[++sp] = ebitmap_get_bit(&r2->dominates, | |
322 | val1 - 1); | |
323 | continue; | |
324 | case CEXPR_INCOMP: | |
5d55a345 EP |
325 | s[++sp] = (!ebitmap_get_bit(&r1->dominates, |
326 | val2 - 1) && | |
327 | !ebitmap_get_bit(&r2->dominates, | |
328 | val1 - 1)); | |
1da177e4 LT |
329 | continue; |
330 | default: | |
331 | break; | |
332 | } | |
333 | break; | |
334 | case CEXPR_L1L2: | |
335 | l1 = &(scontext->range.level[0]); | |
336 | l2 = &(tcontext->range.level[0]); | |
337 | goto mls_ops; | |
338 | case CEXPR_L1H2: | |
339 | l1 = &(scontext->range.level[0]); | |
340 | l2 = &(tcontext->range.level[1]); | |
341 | goto mls_ops; | |
342 | case CEXPR_H1L2: | |
343 | l1 = &(scontext->range.level[1]); | |
344 | l2 = &(tcontext->range.level[0]); | |
345 | goto mls_ops; | |
346 | case CEXPR_H1H2: | |
347 | l1 = &(scontext->range.level[1]); | |
348 | l2 = &(tcontext->range.level[1]); | |
349 | goto mls_ops; | |
350 | case CEXPR_L1H1: | |
351 | l1 = &(scontext->range.level[0]); | |
352 | l2 = &(scontext->range.level[1]); | |
353 | goto mls_ops; | |
354 | case CEXPR_L2H2: | |
355 | l1 = &(tcontext->range.level[0]); | |
356 | l2 = &(tcontext->range.level[1]); | |
357 | goto mls_ops; | |
358 | mls_ops: | |
359 | switch (e->op) { | |
360 | case CEXPR_EQ: | |
361 | s[++sp] = mls_level_eq(l1, l2); | |
362 | continue; | |
363 | case CEXPR_NEQ: | |
364 | s[++sp] = !mls_level_eq(l1, l2); | |
365 | continue; | |
366 | case CEXPR_DOM: | |
367 | s[++sp] = mls_level_dom(l1, l2); | |
368 | continue; | |
369 | case CEXPR_DOMBY: | |
370 | s[++sp] = mls_level_dom(l2, l1); | |
371 | continue; | |
372 | case CEXPR_INCOMP: | |
373 | s[++sp] = mls_level_incomp(l2, l1); | |
374 | continue; | |
375 | default: | |
376 | BUG(); | |
377 | return 0; | |
378 | } | |
379 | break; | |
380 | default: | |
381 | BUG(); | |
382 | return 0; | |
383 | } | |
384 | ||
385 | switch (e->op) { | |
386 | case CEXPR_EQ: | |
387 | s[++sp] = (val1 == val2); | |
388 | break; | |
389 | case CEXPR_NEQ: | |
390 | s[++sp] = (val1 != val2); | |
391 | break; | |
392 | default: | |
393 | BUG(); | |
394 | return 0; | |
395 | } | |
396 | break; | |
397 | case CEXPR_NAMES: | |
398 | if (sp == (CEXPR_MAXDEPTH-1)) | |
399 | return 0; | |
400 | c = scontext; | |
401 | if (e->attr & CEXPR_TARGET) | |
402 | c = tcontext; | |
403 | else if (e->attr & CEXPR_XTARGET) { | |
404 | c = xcontext; | |
405 | if (!c) { | |
406 | BUG(); | |
407 | return 0; | |
408 | } | |
409 | } | |
410 | if (e->attr & CEXPR_USER) | |
411 | val1 = c->user; | |
412 | else if (e->attr & CEXPR_ROLE) | |
413 | val1 = c->role; | |
414 | else if (e->attr & CEXPR_TYPE) | |
415 | val1 = c->type; | |
416 | else { | |
417 | BUG(); | |
418 | return 0; | |
419 | } | |
420 | ||
421 | switch (e->op) { | |
422 | case CEXPR_EQ: | |
423 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); | |
424 | break; | |
425 | case CEXPR_NEQ: | |
426 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); | |
427 | break; | |
428 | default: | |
429 | BUG(); | |
430 | return 0; | |
431 | } | |
432 | break; | |
433 | default: | |
434 | BUG(); | |
435 | return 0; | |
436 | } | |
437 | } | |
438 | ||
439 | BUG_ON(sp != 0); | |
440 | return s[0]; | |
441 | } | |
442 | ||
44c2d9bd KK |
443 | /* |
444 | * security_dump_masked_av - dumps masked permissions during | |
445 | * security_compute_av due to RBAC, MLS/Constraint and Type bounds. | |
446 | */ | |
447 | static int dump_masked_av_helper(void *k, void *d, void *args) | |
448 | { | |
449 | struct perm_datum *pdatum = d; | |
450 | char **permission_names = args; | |
451 | ||
452 | BUG_ON(pdatum->value < 1 || pdatum->value > 32); | |
453 | ||
454 | permission_names[pdatum->value - 1] = (char *)k; | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
aa8e712c SS |
459 | static void security_dump_masked_av(struct policydb *policydb, |
460 | struct context *scontext, | |
44c2d9bd KK |
461 | struct context *tcontext, |
462 | u16 tclass, | |
463 | u32 permissions, | |
464 | const char *reason) | |
465 | { | |
466 | struct common_datum *common_dat; | |
467 | struct class_datum *tclass_dat; | |
468 | struct audit_buffer *ab; | |
469 | char *tclass_name; | |
470 | char *scontext_name = NULL; | |
471 | char *tcontext_name = NULL; | |
472 | char *permission_names[32]; | |
2da5d31b JM |
473 | int index; |
474 | u32 length; | |
44c2d9bd KK |
475 | bool need_comma = false; |
476 | ||
477 | if (!permissions) | |
478 | return; | |
479 | ||
aa8e712c SS |
480 | tclass_name = sym_name(policydb, SYM_CLASSES, tclass - 1); |
481 | tclass_dat = policydb->class_val_to_struct[tclass - 1]; | |
44c2d9bd KK |
482 | common_dat = tclass_dat->comdatum; |
483 | ||
484 | /* init permission_names */ | |
485 | if (common_dat && | |
486 | hashtab_map(common_dat->permissions.table, | |
487 | dump_masked_av_helper, permission_names) < 0) | |
488 | goto out; | |
489 | ||
490 | if (hashtab_map(tclass_dat->permissions.table, | |
491 | dump_masked_av_helper, permission_names) < 0) | |
492 | goto out; | |
493 | ||
494 | /* get scontext/tcontext in text form */ | |
aa8e712c | 495 | if (context_struct_to_string(policydb, scontext, |
44c2d9bd KK |
496 | &scontext_name, &length) < 0) |
497 | goto out; | |
498 | ||
aa8e712c | 499 | if (context_struct_to_string(policydb, tcontext, |
44c2d9bd KK |
500 | &tcontext_name, &length) < 0) |
501 | goto out; | |
502 | ||
503 | /* audit a message */ | |
cdfb6b34 | 504 | ab = audit_log_start(audit_context(), |
44c2d9bd KK |
505 | GFP_ATOMIC, AUDIT_SELINUX_ERR); |
506 | if (!ab) | |
507 | goto out; | |
508 | ||
509 | audit_log_format(ab, "op=security_compute_av reason=%s " | |
510 | "scontext=%s tcontext=%s tclass=%s perms=", | |
511 | reason, scontext_name, tcontext_name, tclass_name); | |
512 | ||
513 | for (index = 0; index < 32; index++) { | |
514 | u32 mask = (1 << index); | |
515 | ||
516 | if ((mask & permissions) == 0) | |
517 | continue; | |
518 | ||
519 | audit_log_format(ab, "%s%s", | |
520 | need_comma ? "," : "", | |
521 | permission_names[index] | |
522 | ? permission_names[index] : "????"); | |
523 | need_comma = true; | |
524 | } | |
525 | audit_log_end(ab); | |
526 | out: | |
527 | /* release scontext/tcontext */ | |
528 | kfree(tcontext_name); | |
529 | kfree(scontext_name); | |
530 | ||
531 | return; | |
532 | } | |
533 | ||
d9250dea KK |
534 | /* |
535 | * security_boundary_permission - drops violated permissions | |
536 | * on boundary constraint. | |
537 | */ | |
aa8e712c SS |
538 | static void type_attribute_bounds_av(struct policydb *policydb, |
539 | struct context *scontext, | |
d9250dea KK |
540 | struct context *tcontext, |
541 | u16 tclass, | |
d9250dea KK |
542 | struct av_decision *avd) |
543 | { | |
2ae3ba39 | 544 | struct context lo_scontext; |
7ea59202 | 545 | struct context lo_tcontext, *tcontextp = tcontext; |
2ae3ba39 | 546 | struct av_decision lo_avd; |
23bdecb0 EP |
547 | struct type_datum *source; |
548 | struct type_datum *target; | |
2ae3ba39 | 549 | u32 masked = 0; |
d9250dea | 550 | |
f07ea1d4 | 551 | source = policydb->type_val_to_struct[scontext->type - 1]; |
23bdecb0 EP |
552 | BUG_ON(!source); |
553 | ||
7ea59202 SS |
554 | if (!source->bounds) |
555 | return; | |
556 | ||
f07ea1d4 | 557 | target = policydb->type_val_to_struct[tcontext->type - 1]; |
23bdecb0 EP |
558 | BUG_ON(!target); |
559 | ||
7ea59202 | 560 | memset(&lo_avd, 0, sizeof(lo_avd)); |
d9250dea | 561 | |
7ea59202 SS |
562 | memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); |
563 | lo_scontext.type = source->bounds; | |
2ae3ba39 KK |
564 | |
565 | if (target->bounds) { | |
2ae3ba39 KK |
566 | memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); |
567 | lo_tcontext.type = target->bounds; | |
7ea59202 | 568 | tcontextp = &lo_tcontext; |
2ae3ba39 KK |
569 | } |
570 | ||
aa8e712c | 571 | context_struct_compute_av(policydb, &lo_scontext, |
7ea59202 SS |
572 | tcontextp, |
573 | tclass, | |
574 | &lo_avd, | |
575 | NULL); | |
2ae3ba39 | 576 | |
7ea59202 | 577 | masked = ~lo_avd.allowed & avd->allowed; |
d9250dea | 578 | |
7ea59202 SS |
579 | if (likely(!masked)) |
580 | return; /* no masked permission */ | |
d9250dea | 581 | |
7ea59202 SS |
582 | /* mask violated permissions */ |
583 | avd->allowed &= ~masked; | |
584 | ||
585 | /* audit masked permissions */ | |
aa8e712c | 586 | security_dump_masked_av(policydb, scontext, tcontext, |
7ea59202 | 587 | tclass, masked, "bounds"); |
d9250dea KK |
588 | } |
589 | ||
1da177e4 | 590 | /* |
fa1aa143 JVS |
591 | * flag which drivers have permissions |
592 | * only looking for ioctl based extended permssions | |
593 | */ | |
594 | void services_compute_xperms_drivers( | |
595 | struct extended_perms *xperms, | |
596 | struct avtab_node *node) | |
597 | { | |
598 | unsigned int i; | |
599 | ||
600 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
601 | /* if one or more driver has all permissions allowed */ | |
602 | for (i = 0; i < ARRAY_SIZE(xperms->drivers.p); i++) | |
603 | xperms->drivers.p[i] |= node->datum.u.xperms->perms.p[i]; | |
604 | } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
605 | /* if allowing permissions within a driver */ | |
606 | security_xperm_set(xperms->drivers.p, | |
607 | node->datum.u.xperms->driver); | |
608 | } | |
609 | ||
610 | /* If no ioctl commands are allowed, ignore auditallow and auditdeny */ | |
611 | if (node->key.specified & AVTAB_XPERMS_ALLOWED) | |
612 | xperms->len = 1; | |
613 | } | |
614 | ||
615 | /* | |
616 | * Compute access vectors and extended permissions based on a context | |
617 | * structure pair for the permissions in a particular class. | |
1da177e4 | 618 | */ |
aa8e712c SS |
619 | static void context_struct_compute_av(struct policydb *policydb, |
620 | struct context *scontext, | |
621 | struct context *tcontext, | |
622 | u16 tclass, | |
623 | struct av_decision *avd, | |
624 | struct extended_perms *xperms) | |
1da177e4 LT |
625 | { |
626 | struct constraint_node *constraint; | |
627 | struct role_allow *ra; | |
628 | struct avtab_key avkey; | |
782ebb99 | 629 | struct avtab_node *node; |
1da177e4 | 630 | struct class_datum *tclass_datum; |
782ebb99 SS |
631 | struct ebitmap *sattr, *tattr; |
632 | struct ebitmap_node *snode, *tnode; | |
633 | unsigned int i, j; | |
1da177e4 | 634 | |
1da177e4 | 635 | avd->allowed = 0; |
1da177e4 LT |
636 | avd->auditallow = 0; |
637 | avd->auditdeny = 0xffffffff; | |
fa1aa143 JVS |
638 | if (xperms) { |
639 | memset(&xperms->drivers, 0, sizeof(xperms->drivers)); | |
640 | xperms->len = 0; | |
641 | } | |
1da177e4 | 642 | |
aa8e712c | 643 | if (unlikely(!tclass || tclass > policydb->p_classes.nprim)) { |
c6d3aaa4 | 644 | if (printk_ratelimit()) |
b54c85c1 | 645 | pr_warn("SELinux: Invalid class %hu\n", tclass); |
19439d05 | 646 | return; |
c6d3aaa4 | 647 | } |
3f12070e | 648 | |
aa8e712c | 649 | tclass_datum = policydb->class_val_to_struct[tclass - 1]; |
3f12070e | 650 | |
1da177e4 LT |
651 | /* |
652 | * If a specific type enforcement rule was defined for | |
653 | * this permission check, then use it. | |
654 | */ | |
1da177e4 | 655 | avkey.target_class = tclass; |
fa1aa143 | 656 | avkey.specified = AVTAB_AV | AVTAB_XPERMS; |
acdf52d9 | 657 | sattr = &policydb->type_attr_map_array[scontext->type - 1]; |
acdf52d9 | 658 | tattr = &policydb->type_attr_map_array[tcontext->type - 1]; |
9fe79ad1 KK |
659 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
660 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
782ebb99 SS |
661 | avkey.source_type = i + 1; |
662 | avkey.target_type = j + 1; | |
aa8e712c SS |
663 | for (node = avtab_search_node(&policydb->te_avtab, |
664 | &avkey); | |
dbc74c65 | 665 | node; |
782ebb99 SS |
666 | node = avtab_search_node_next(node, avkey.specified)) { |
667 | if (node->key.specified == AVTAB_ALLOWED) | |
fa1aa143 | 668 | avd->allowed |= node->datum.u.data; |
782ebb99 | 669 | else if (node->key.specified == AVTAB_AUDITALLOW) |
fa1aa143 | 670 | avd->auditallow |= node->datum.u.data; |
782ebb99 | 671 | else if (node->key.specified == AVTAB_AUDITDENY) |
fa1aa143 JVS |
672 | avd->auditdeny &= node->datum.u.data; |
673 | else if (xperms && (node->key.specified & AVTAB_XPERMS)) | |
674 | services_compute_xperms_drivers(xperms, node); | |
782ebb99 | 675 | } |
1da177e4 | 676 | |
782ebb99 | 677 | /* Check conditional av table for additional permissions */ |
aa8e712c | 678 | cond_compute_av(&policydb->te_cond_avtab, &avkey, |
fa1aa143 | 679 | avd, xperms); |
782ebb99 SS |
680 | |
681 | } | |
682 | } | |
1da177e4 LT |
683 | |
684 | /* | |
685 | * Remove any permissions prohibited by a constraint (this includes | |
686 | * the MLS policy). | |
687 | */ | |
688 | constraint = tclass_datum->constraints; | |
689 | while (constraint) { | |
690 | if ((constraint->permissions & (avd->allowed)) && | |
aa8e712c | 691 | !constraint_expr_eval(policydb, scontext, tcontext, NULL, |
1da177e4 | 692 | constraint->expr)) { |
caabbdc0 | 693 | avd->allowed &= ~(constraint->permissions); |
1da177e4 LT |
694 | } |
695 | constraint = constraint->next; | |
696 | } | |
697 | ||
698 | /* | |
699 | * If checking process transition permission and the | |
700 | * role is changing, then check the (current_role, new_role) | |
701 | * pair. | |
702 | */ | |
aa8e712c SS |
703 | if (tclass == policydb->process_class && |
704 | (avd->allowed & policydb->process_trans_perms) && | |
1da177e4 | 705 | scontext->role != tcontext->role) { |
aa8e712c | 706 | for (ra = policydb->role_allow; ra; ra = ra->next) { |
1da177e4 LT |
707 | if (scontext->role == ra->role && |
708 | tcontext->role == ra->new_role) | |
709 | break; | |
710 | } | |
711 | if (!ra) | |
aa8e712c | 712 | avd->allowed &= ~policydb->process_trans_perms; |
1da177e4 LT |
713 | } |
714 | ||
d9250dea KK |
715 | /* |
716 | * If the given source and target types have boundary | |
717 | * constraint, lazy checks have to mask any violated | |
718 | * permission and notice it to userspace via audit. | |
719 | */ | |
aa8e712c | 720 | type_attribute_bounds_av(policydb, scontext, tcontext, |
19439d05 | 721 | tclass, avd); |
1da177e4 LT |
722 | } |
723 | ||
aa8e712c | 724 | static int security_validtrans_handle_fail(struct selinux_state *state, |
d97bd23c OM |
725 | struct sidtab_entry *oentry, |
726 | struct sidtab_entry *nentry, | |
727 | struct sidtab_entry *tentry, | |
5d55a345 | 728 | u16 tclass) |
1da177e4 | 729 | { |
aa8e712c | 730 | struct policydb *p = &state->ss->policydb; |
d97bd23c | 731 | struct sidtab *sidtab = state->ss->sidtab; |
1da177e4 LT |
732 | char *o = NULL, *n = NULL, *t = NULL; |
733 | u32 olen, nlen, tlen; | |
734 | ||
d97bd23c | 735 | if (sidtab_entry_to_string(p, sidtab, oentry, &o, &olen)) |
1da177e4 | 736 | goto out; |
d97bd23c | 737 | if (sidtab_entry_to_string(p, sidtab, nentry, &n, &nlen)) |
1da177e4 | 738 | goto out; |
d97bd23c | 739 | if (sidtab_entry_to_string(p, sidtab, tentry, &t, &tlen)) |
1da177e4 | 740 | goto out; |
cdfb6b34 | 741 | audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR, |
4093a844 | 742 | "op=security_validate_transition seresult=denied" |
5d55a345 | 743 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", |
aa8e712c | 744 | o, n, t, sym_name(p, SYM_CLASSES, tclass-1)); |
1da177e4 LT |
745 | out: |
746 | kfree(o); | |
747 | kfree(n); | |
748 | kfree(t); | |
749 | ||
e5a5ca96 | 750 | if (!enforcing_enabled(state)) |
1da177e4 LT |
751 | return 0; |
752 | return -EPERM; | |
753 | } | |
754 | ||
aa8e712c SS |
755 | static int security_compute_validatetrans(struct selinux_state *state, |
756 | u32 oldsid, u32 newsid, u32 tasksid, | |
f9df6458 | 757 | u16 orig_tclass, bool user) |
1da177e4 | 758 | { |
aa8e712c SS |
759 | struct policydb *policydb; |
760 | struct sidtab *sidtab; | |
d97bd23c OM |
761 | struct sidtab_entry *oentry; |
762 | struct sidtab_entry *nentry; | |
763 | struct sidtab_entry *tentry; | |
1da177e4 LT |
764 | struct class_datum *tclass_datum; |
765 | struct constraint_node *constraint; | |
c6d3aaa4 | 766 | u16 tclass; |
1da177e4 LT |
767 | int rc = 0; |
768 | ||
aa8e712c | 769 | |
65cddd50 | 770 | if (!selinux_initialized(state)) |
1da177e4 LT |
771 | return 0; |
772 | ||
aa8e712c SS |
773 | read_lock(&state->ss->policy_rwlock); |
774 | ||
775 | policydb = &state->ss->policydb; | |
24ed7fda | 776 | sidtab = state->ss->sidtab; |
1da177e4 | 777 | |
f9df6458 | 778 | if (!user) |
aa8e712c | 779 | tclass = unmap_class(&state->ss->map, orig_tclass); |
f9df6458 AP |
780 | else |
781 | tclass = orig_tclass; | |
c6d3aaa4 | 782 | |
aa8e712c | 783 | if (!tclass || tclass > policydb->p_classes.nprim) { |
1da177e4 LT |
784 | rc = -EINVAL; |
785 | goto out; | |
786 | } | |
aa8e712c | 787 | tclass_datum = policydb->class_val_to_struct[tclass - 1]; |
1da177e4 | 788 | |
d97bd23c OM |
789 | oentry = sidtab_search_entry(sidtab, oldsid); |
790 | if (!oentry) { | |
b54c85c1 | 791 | pr_err("SELinux: %s: unrecognized SID %d\n", |
744ba35e | 792 | __func__, oldsid); |
1da177e4 LT |
793 | rc = -EINVAL; |
794 | goto out; | |
795 | } | |
796 | ||
d97bd23c OM |
797 | nentry = sidtab_search_entry(sidtab, newsid); |
798 | if (!nentry) { | |
b54c85c1 | 799 | pr_err("SELinux: %s: unrecognized SID %d\n", |
744ba35e | 800 | __func__, newsid); |
1da177e4 LT |
801 | rc = -EINVAL; |
802 | goto out; | |
803 | } | |
804 | ||
d97bd23c OM |
805 | tentry = sidtab_search_entry(sidtab, tasksid); |
806 | if (!tentry) { | |
b54c85c1 | 807 | pr_err("SELinux: %s: unrecognized SID %d\n", |
744ba35e | 808 | __func__, tasksid); |
1da177e4 LT |
809 | rc = -EINVAL; |
810 | goto out; | |
811 | } | |
812 | ||
813 | constraint = tclass_datum->validatetrans; | |
814 | while (constraint) { | |
d97bd23c OM |
815 | if (!constraint_expr_eval(policydb, &oentry->context, |
816 | &nentry->context, &tentry->context, | |
817 | constraint->expr)) { | |
f9df6458 AP |
818 | if (user) |
819 | rc = -EPERM; | |
820 | else | |
aa8e712c | 821 | rc = security_validtrans_handle_fail(state, |
d97bd23c OM |
822 | oentry, |
823 | nentry, | |
824 | tentry, | |
f9df6458 | 825 | tclass); |
1da177e4 LT |
826 | goto out; |
827 | } | |
828 | constraint = constraint->next; | |
829 | } | |
830 | ||
831 | out: | |
aa8e712c | 832 | read_unlock(&state->ss->policy_rwlock); |
1da177e4 LT |
833 | return rc; |
834 | } | |
835 | ||
aa8e712c SS |
836 | int security_validate_transition_user(struct selinux_state *state, |
837 | u32 oldsid, u32 newsid, u32 tasksid, | |
838 | u16 tclass) | |
f9df6458 | 839 | { |
aa8e712c SS |
840 | return security_compute_validatetrans(state, oldsid, newsid, tasksid, |
841 | tclass, true); | |
f9df6458 AP |
842 | } |
843 | ||
aa8e712c SS |
844 | int security_validate_transition(struct selinux_state *state, |
845 | u32 oldsid, u32 newsid, u32 tasksid, | |
f9df6458 AP |
846 | u16 orig_tclass) |
847 | { | |
aa8e712c SS |
848 | return security_compute_validatetrans(state, oldsid, newsid, tasksid, |
849 | orig_tclass, false); | |
f9df6458 AP |
850 | } |
851 | ||
d9250dea KK |
852 | /* |
853 | * security_bounded_transition - check whether the given | |
854 | * transition is directed to bounded, or not. | |
855 | * It returns 0, if @newsid is bounded by @oldsid. | |
856 | * Otherwise, it returns error code. | |
857 | * | |
858 | * @oldsid : current security identifier | |
859 | * @newsid : destinated security identifier | |
860 | */ | |
aa8e712c SS |
861 | int security_bounded_transition(struct selinux_state *state, |
862 | u32 old_sid, u32 new_sid) | |
d9250dea | 863 | { |
aa8e712c SS |
864 | struct policydb *policydb; |
865 | struct sidtab *sidtab; | |
d97bd23c | 866 | struct sidtab_entry *old_entry, *new_entry; |
d9250dea KK |
867 | struct type_datum *type; |
868 | int index; | |
4b02b524 | 869 | int rc; |
d9250dea | 870 | |
65cddd50 | 871 | if (!selinux_initialized(state)) |
4b14752e PM |
872 | return 0; |
873 | ||
aa8e712c SS |
874 | read_lock(&state->ss->policy_rwlock); |
875 | ||
876 | policydb = &state->ss->policydb; | |
24ed7fda | 877 | sidtab = state->ss->sidtab; |
d9250dea | 878 | |
4b02b524 | 879 | rc = -EINVAL; |
d97bd23c OM |
880 | old_entry = sidtab_search_entry(sidtab, old_sid); |
881 | if (!old_entry) { | |
b54c85c1 | 882 | pr_err("SELinux: %s: unrecognized SID %u\n", |
d9250dea KK |
883 | __func__, old_sid); |
884 | goto out; | |
885 | } | |
886 | ||
4b02b524 | 887 | rc = -EINVAL; |
d97bd23c OM |
888 | new_entry = sidtab_search_entry(sidtab, new_sid); |
889 | if (!new_entry) { | |
b54c85c1 | 890 | pr_err("SELinux: %s: unrecognized SID %u\n", |
d9250dea KK |
891 | __func__, new_sid); |
892 | goto out; | |
893 | } | |
894 | ||
4b02b524 | 895 | rc = 0; |
af901ca1 | 896 | /* type/domain unchanged */ |
d97bd23c | 897 | if (old_entry->context.type == new_entry->context.type) |
d9250dea | 898 | goto out; |
d9250dea | 899 | |
d97bd23c | 900 | index = new_entry->context.type; |
d9250dea | 901 | while (true) { |
f07ea1d4 | 902 | type = policydb->type_val_to_struct[index - 1]; |
d9250dea KK |
903 | BUG_ON(!type); |
904 | ||
905 | /* not bounded anymore */ | |
4b02b524 EP |
906 | rc = -EPERM; |
907 | if (!type->bounds) | |
d9250dea | 908 | break; |
d9250dea KK |
909 | |
910 | /* @newsid is bounded by @oldsid */ | |
4b02b524 | 911 | rc = 0; |
d97bd23c | 912 | if (type->bounds == old_entry->context.type) |
d9250dea | 913 | break; |
4b02b524 | 914 | |
d9250dea KK |
915 | index = type->bounds; |
916 | } | |
44c2d9bd KK |
917 | |
918 | if (rc) { | |
919 | char *old_name = NULL; | |
920 | char *new_name = NULL; | |
2da5d31b | 921 | u32 length; |
44c2d9bd | 922 | |
d97bd23c OM |
923 | if (!sidtab_entry_to_string(policydb, sidtab, old_entry, |
924 | &old_name, &length) && | |
925 | !sidtab_entry_to_string(policydb, sidtab, new_entry, | |
926 | &new_name, &length)) { | |
cdfb6b34 | 927 | audit_log(audit_context(), |
44c2d9bd KK |
928 | GFP_ATOMIC, AUDIT_SELINUX_ERR, |
929 | "op=security_bounded_transition " | |
4093a844 | 930 | "seresult=denied " |
44c2d9bd KK |
931 | "oldcontext=%s newcontext=%s", |
932 | old_name, new_name); | |
933 | } | |
934 | kfree(new_name); | |
935 | kfree(old_name); | |
936 | } | |
d9250dea | 937 | out: |
aa8e712c | 938 | read_unlock(&state->ss->policy_rwlock); |
d9250dea KK |
939 | |
940 | return rc; | |
941 | } | |
942 | ||
aa8e712c | 943 | static void avd_init(struct selinux_state *state, struct av_decision *avd) |
c6d3aaa4 | 944 | { |
19439d05 SS |
945 | avd->allowed = 0; |
946 | avd->auditallow = 0; | |
947 | avd->auditdeny = 0xffffffff; | |
aa8e712c | 948 | avd->seqno = state->ss->latest_granting; |
19439d05 | 949 | avd->flags = 0; |
c6d3aaa4 SS |
950 | } |
951 | ||
fa1aa143 JVS |
952 | void services_compute_xperms_decision(struct extended_perms_decision *xpermd, |
953 | struct avtab_node *node) | |
954 | { | |
955 | unsigned int i; | |
956 | ||
957 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
958 | if (xpermd->driver != node->datum.u.xperms->driver) | |
959 | return; | |
960 | } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
961 | if (!security_xperm_test(node->datum.u.xperms->perms.p, | |
962 | xpermd->driver)) | |
963 | return; | |
964 | } else { | |
965 | BUG(); | |
966 | } | |
967 | ||
968 | if (node->key.specified == AVTAB_XPERMS_ALLOWED) { | |
969 | xpermd->used |= XPERMS_ALLOWED; | |
970 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
971 | memset(xpermd->allowed->p, 0xff, | |
972 | sizeof(xpermd->allowed->p)); | |
973 | } | |
974 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
975 | for (i = 0; i < ARRAY_SIZE(xpermd->allowed->p); i++) | |
976 | xpermd->allowed->p[i] |= | |
977 | node->datum.u.xperms->perms.p[i]; | |
978 | } | |
979 | } else if (node->key.specified == AVTAB_XPERMS_AUDITALLOW) { | |
980 | xpermd->used |= XPERMS_AUDITALLOW; | |
981 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
982 | memset(xpermd->auditallow->p, 0xff, | |
983 | sizeof(xpermd->auditallow->p)); | |
984 | } | |
985 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
986 | for (i = 0; i < ARRAY_SIZE(xpermd->auditallow->p); i++) | |
987 | xpermd->auditallow->p[i] |= | |
988 | node->datum.u.xperms->perms.p[i]; | |
989 | } | |
990 | } else if (node->key.specified == AVTAB_XPERMS_DONTAUDIT) { | |
991 | xpermd->used |= XPERMS_DONTAUDIT; | |
992 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { | |
993 | memset(xpermd->dontaudit->p, 0xff, | |
994 | sizeof(xpermd->dontaudit->p)); | |
995 | } | |
996 | if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { | |
997 | for (i = 0; i < ARRAY_SIZE(xpermd->dontaudit->p); i++) | |
998 | xpermd->dontaudit->p[i] |= | |
999 | node->datum.u.xperms->perms.p[i]; | |
1000 | } | |
1001 | } else { | |
1002 | BUG(); | |
1003 | } | |
1004 | } | |
1005 | ||
aa8e712c SS |
1006 | void security_compute_xperms_decision(struct selinux_state *state, |
1007 | u32 ssid, | |
1008 | u32 tsid, | |
1009 | u16 orig_tclass, | |
1010 | u8 driver, | |
1011 | struct extended_perms_decision *xpermd) | |
fa1aa143 | 1012 | { |
aa8e712c SS |
1013 | struct policydb *policydb; |
1014 | struct sidtab *sidtab; | |
fa1aa143 JVS |
1015 | u16 tclass; |
1016 | struct context *scontext, *tcontext; | |
1017 | struct avtab_key avkey; | |
1018 | struct avtab_node *node; | |
1019 | struct ebitmap *sattr, *tattr; | |
1020 | struct ebitmap_node *snode, *tnode; | |
1021 | unsigned int i, j; | |
1022 | ||
1023 | xpermd->driver = driver; | |
1024 | xpermd->used = 0; | |
1025 | memset(xpermd->allowed->p, 0, sizeof(xpermd->allowed->p)); | |
1026 | memset(xpermd->auditallow->p, 0, sizeof(xpermd->auditallow->p)); | |
1027 | memset(xpermd->dontaudit->p, 0, sizeof(xpermd->dontaudit->p)); | |
1028 | ||
aa8e712c | 1029 | read_lock(&state->ss->policy_rwlock); |
65cddd50 | 1030 | if (!selinux_initialized(state)) |
fa1aa143 JVS |
1031 | goto allow; |
1032 | ||
aa8e712c | 1033 | policydb = &state->ss->policydb; |
24ed7fda | 1034 | sidtab = state->ss->sidtab; |
aa8e712c SS |
1035 | |
1036 | scontext = sidtab_search(sidtab, ssid); | |
fa1aa143 | 1037 | if (!scontext) { |
b54c85c1 | 1038 | pr_err("SELinux: %s: unrecognized SID %d\n", |
fa1aa143 JVS |
1039 | __func__, ssid); |
1040 | goto out; | |
1041 | } | |
1042 | ||
aa8e712c | 1043 | tcontext = sidtab_search(sidtab, tsid); |
fa1aa143 | 1044 | if (!tcontext) { |
b54c85c1 | 1045 | pr_err("SELinux: %s: unrecognized SID %d\n", |
fa1aa143 JVS |
1046 | __func__, tsid); |
1047 | goto out; | |
1048 | } | |
1049 | ||
aa8e712c | 1050 | tclass = unmap_class(&state->ss->map, orig_tclass); |
fa1aa143 | 1051 | if (unlikely(orig_tclass && !tclass)) { |
aa8e712c | 1052 | if (policydb->allow_unknown) |
fa1aa143 JVS |
1053 | goto allow; |
1054 | goto out; | |
1055 | } | |
1056 | ||
1057 | ||
aa8e712c | 1058 | if (unlikely(!tclass || tclass > policydb->p_classes.nprim)) { |
fa1aa143 JVS |
1059 | pr_warn_ratelimited("SELinux: Invalid class %hu\n", tclass); |
1060 | goto out; | |
1061 | } | |
1062 | ||
1063 | avkey.target_class = tclass; | |
1064 | avkey.specified = AVTAB_XPERMS; | |
acdf52d9 | 1065 | sattr = &policydb->type_attr_map_array[scontext->type - 1]; |
acdf52d9 | 1066 | tattr = &policydb->type_attr_map_array[tcontext->type - 1]; |
fa1aa143 JVS |
1067 | ebitmap_for_each_positive_bit(sattr, snode, i) { |
1068 | ebitmap_for_each_positive_bit(tattr, tnode, j) { | |
1069 | avkey.source_type = i + 1; | |
1070 | avkey.target_type = j + 1; | |
aa8e712c SS |
1071 | for (node = avtab_search_node(&policydb->te_avtab, |
1072 | &avkey); | |
fa1aa143 JVS |
1073 | node; |
1074 | node = avtab_search_node_next(node, avkey.specified)) | |
1075 | services_compute_xperms_decision(xpermd, node); | |
1076 | ||
aa8e712c | 1077 | cond_compute_xperms(&policydb->te_cond_avtab, |
fa1aa143 JVS |
1078 | &avkey, xpermd); |
1079 | } | |
1080 | } | |
1081 | out: | |
aa8e712c | 1082 | read_unlock(&state->ss->policy_rwlock); |
fa1aa143 JVS |
1083 | return; |
1084 | allow: | |
1085 | memset(xpermd->allowed->p, 0xff, sizeof(xpermd->allowed->p)); | |
1086 | goto out; | |
1087 | } | |
19439d05 | 1088 | |
1da177e4 LT |
1089 | /** |
1090 | * security_compute_av - Compute access vector decisions. | |
1091 | * @ssid: source security identifier | |
1092 | * @tsid: target security identifier | |
1093 | * @tclass: target security class | |
1da177e4 | 1094 | * @avd: access vector decisions |
fa1aa143 | 1095 | * @xperms: extended permissions |
1da177e4 LT |
1096 | * |
1097 | * Compute a set of access vector decisions based on the | |
1098 | * SID pair (@ssid, @tsid) for the permissions in @tclass. | |
1da177e4 | 1099 | */ |
aa8e712c SS |
1100 | void security_compute_av(struct selinux_state *state, |
1101 | u32 ssid, | |
19439d05 SS |
1102 | u32 tsid, |
1103 | u16 orig_tclass, | |
fa1aa143 JVS |
1104 | struct av_decision *avd, |
1105 | struct extended_perms *xperms) | |
1da177e4 | 1106 | { |
aa8e712c SS |
1107 | struct policydb *policydb; |
1108 | struct sidtab *sidtab; | |
c6d3aaa4 | 1109 | u16 tclass; |
19439d05 | 1110 | struct context *scontext = NULL, *tcontext = NULL; |
c6d3aaa4 | 1111 | |
aa8e712c SS |
1112 | read_lock(&state->ss->policy_rwlock); |
1113 | avd_init(state, avd); | |
fa1aa143 | 1114 | xperms->len = 0; |
65cddd50 | 1115 | if (!selinux_initialized(state)) |
c6d3aaa4 SS |
1116 | goto allow; |
1117 | ||
aa8e712c | 1118 | policydb = &state->ss->policydb; |
24ed7fda | 1119 | sidtab = state->ss->sidtab; |
aa8e712c SS |
1120 | |
1121 | scontext = sidtab_search(sidtab, ssid); | |
19439d05 | 1122 | if (!scontext) { |
b54c85c1 | 1123 | pr_err("SELinux: %s: unrecognized SID %d\n", |
19439d05 SS |
1124 | __func__, ssid); |
1125 | goto out; | |
1126 | } | |
1127 | ||
1128 | /* permissive domain? */ | |
aa8e712c | 1129 | if (ebitmap_get_bit(&policydb->permissive_map, scontext->type)) |
19439d05 SS |
1130 | avd->flags |= AVD_FLAGS_PERMISSIVE; |
1131 | ||
aa8e712c | 1132 | tcontext = sidtab_search(sidtab, tsid); |
19439d05 | 1133 | if (!tcontext) { |
b54c85c1 | 1134 | pr_err("SELinux: %s: unrecognized SID %d\n", |
19439d05 SS |
1135 | __func__, tsid); |
1136 | goto out; | |
1137 | } | |
1138 | ||
aa8e712c | 1139 | tclass = unmap_class(&state->ss->map, orig_tclass); |
c6d3aaa4 | 1140 | if (unlikely(orig_tclass && !tclass)) { |
aa8e712c | 1141 | if (policydb->allow_unknown) |
c6d3aaa4 | 1142 | goto allow; |
b7f3008a | 1143 | goto out; |
c6d3aaa4 | 1144 | } |
aa8e712c SS |
1145 | context_struct_compute_av(policydb, scontext, tcontext, tclass, avd, |
1146 | xperms); | |
1147 | map_decision(&state->ss->map, orig_tclass, avd, | |
1148 | policydb->allow_unknown); | |
b7f3008a | 1149 | out: |
aa8e712c | 1150 | read_unlock(&state->ss->policy_rwlock); |
19439d05 | 1151 | return; |
c6d3aaa4 SS |
1152 | allow: |
1153 | avd->allowed = 0xffffffff; | |
b7f3008a | 1154 | goto out; |
c6d3aaa4 SS |
1155 | } |
1156 | ||
aa8e712c SS |
1157 | void security_compute_av_user(struct selinux_state *state, |
1158 | u32 ssid, | |
19439d05 SS |
1159 | u32 tsid, |
1160 | u16 tclass, | |
1161 | struct av_decision *avd) | |
c6d3aaa4 | 1162 | { |
aa8e712c SS |
1163 | struct policydb *policydb; |
1164 | struct sidtab *sidtab; | |
19439d05 | 1165 | struct context *scontext = NULL, *tcontext = NULL; |
1da177e4 | 1166 | |
aa8e712c SS |
1167 | read_lock(&state->ss->policy_rwlock); |
1168 | avd_init(state, avd); | |
65cddd50 | 1169 | if (!selinux_initialized(state)) |
19439d05 SS |
1170 | goto allow; |
1171 | ||
aa8e712c | 1172 | policydb = &state->ss->policydb; |
24ed7fda | 1173 | sidtab = state->ss->sidtab; |
aa8e712c SS |
1174 | |
1175 | scontext = sidtab_search(sidtab, ssid); | |
19439d05 | 1176 | if (!scontext) { |
b54c85c1 | 1177 | pr_err("SELinux: %s: unrecognized SID %d\n", |
19439d05 SS |
1178 | __func__, ssid); |
1179 | goto out; | |
1da177e4 LT |
1180 | } |
1181 | ||
19439d05 | 1182 | /* permissive domain? */ |
aa8e712c | 1183 | if (ebitmap_get_bit(&policydb->permissive_map, scontext->type)) |
19439d05 SS |
1184 | avd->flags |= AVD_FLAGS_PERMISSIVE; |
1185 | ||
aa8e712c | 1186 | tcontext = sidtab_search(sidtab, tsid); |
19439d05 | 1187 | if (!tcontext) { |
b54c85c1 | 1188 | pr_err("SELinux: %s: unrecognized SID %d\n", |
19439d05 SS |
1189 | __func__, tsid); |
1190 | goto out; | |
1191 | } | |
1192 | ||
1193 | if (unlikely(!tclass)) { | |
aa8e712c | 1194 | if (policydb->allow_unknown) |
19439d05 SS |
1195 | goto allow; |
1196 | goto out; | |
1197 | } | |
1198 | ||
aa8e712c SS |
1199 | context_struct_compute_av(policydb, scontext, tcontext, tclass, avd, |
1200 | NULL); | |
19439d05 | 1201 | out: |
aa8e712c | 1202 | read_unlock(&state->ss->policy_rwlock); |
19439d05 SS |
1203 | return; |
1204 | allow: | |
1205 | avd->allowed = 0xffffffff; | |
1206 | goto out; | |
1da177e4 LT |
1207 | } |
1208 | ||
1209 | /* | |
1210 | * Write the security context string representation of | |
1211 | * the context structure `context' into a dynamically | |
1212 | * allocated string of the correct size. Set `*scontext' | |
1213 | * to point to this string and set `*scontext_len' to | |
1214 | * the length of the string. | |
1215 | */ | |
aa8e712c SS |
1216 | static int context_struct_to_string(struct policydb *p, |
1217 | struct context *context, | |
1218 | char **scontext, u32 *scontext_len) | |
1da177e4 LT |
1219 | { |
1220 | char *scontextp; | |
1221 | ||
d5630b9d EP |
1222 | if (scontext) |
1223 | *scontext = NULL; | |
1da177e4 LT |
1224 | *scontext_len = 0; |
1225 | ||
12b29f34 SS |
1226 | if (context->len) { |
1227 | *scontext_len = context->len; | |
bb7081ab EP |
1228 | if (scontext) { |
1229 | *scontext = kstrdup(context->str, GFP_ATOMIC); | |
1230 | if (!(*scontext)) | |
1231 | return -ENOMEM; | |
1232 | } | |
12b29f34 SS |
1233 | return 0; |
1234 | } | |
1235 | ||
1da177e4 | 1236 | /* Compute the size of the context. */ |
aa8e712c SS |
1237 | *scontext_len += strlen(sym_name(p, SYM_USERS, context->user - 1)) + 1; |
1238 | *scontext_len += strlen(sym_name(p, SYM_ROLES, context->role - 1)) + 1; | |
1239 | *scontext_len += strlen(sym_name(p, SYM_TYPES, context->type - 1)) + 1; | |
1240 | *scontext_len += mls_compute_context_len(p, context); | |
1da177e4 | 1241 | |
d5630b9d EP |
1242 | if (!scontext) |
1243 | return 0; | |
1244 | ||
1da177e4 LT |
1245 | /* Allocate space for the context; caller must free this space. */ |
1246 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); | |
5d55a345 | 1247 | if (!scontextp) |
1da177e4 | 1248 | return -ENOMEM; |
1da177e4 LT |
1249 | *scontext = scontextp; |
1250 | ||
1251 | /* | |
1252 | * Copy the user name, role name and type name into the context. | |
1253 | */ | |
9529c788 | 1254 | scontextp += sprintf(scontextp, "%s:%s:%s", |
aa8e712c SS |
1255 | sym_name(p, SYM_USERS, context->user - 1), |
1256 | sym_name(p, SYM_ROLES, context->role - 1), | |
1257 | sym_name(p, SYM_TYPES, context->type - 1)); | |
1da177e4 | 1258 | |
aa8e712c | 1259 | mls_sid_to_context(p, context, &scontextp); |
1da177e4 LT |
1260 | |
1261 | *scontextp = 0; | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
d97bd23c OM |
1266 | static int sidtab_entry_to_string(struct policydb *p, |
1267 | struct sidtab *sidtab, | |
1268 | struct sidtab_entry *entry, | |
1269 | char **scontext, u32 *scontext_len) | |
1270 | { | |
1271 | int rc = sidtab_sid2str_get(sidtab, entry, scontext, scontext_len); | |
1272 | ||
1273 | if (rc != -ENOENT) | |
1274 | return rc; | |
1275 | ||
1276 | rc = context_struct_to_string(p, &entry->context, scontext, | |
1277 | scontext_len); | |
1278 | if (!rc && scontext) | |
1279 | sidtab_sid2str_put(sidtab, entry, *scontext, *scontext_len); | |
1280 | return rc; | |
1281 | } | |
1282 | ||
1da177e4 LT |
1283 | #include "initial_sid_to_string.h" |
1284 | ||
66f8e2f0 JVS |
1285 | int security_sidtab_hash_stats(struct selinux_state *state, char *page) |
1286 | { | |
1287 | int rc; | |
1288 | ||
65cddd50 | 1289 | if (!selinux_initialized(state)) { |
15b590a8 PM |
1290 | pr_err("SELinux: %s: called before initial load_policy\n", |
1291 | __func__); | |
1292 | return -EINVAL; | |
1293 | } | |
1294 | ||
66f8e2f0 JVS |
1295 | read_lock(&state->ss->policy_rwlock); |
1296 | rc = sidtab_hash_stats(state->ss->sidtab, page); | |
1297 | read_unlock(&state->ss->policy_rwlock); | |
1298 | ||
1299 | return rc; | |
1300 | } | |
1301 | ||
f0ee2e46 JC |
1302 | const char *security_get_initial_sid_context(u32 sid) |
1303 | { | |
1304 | if (unlikely(sid > SECINITSID_NUM)) | |
1305 | return NULL; | |
1306 | return initial_sid_to_string[sid]; | |
1307 | } | |
1308 | ||
aa8e712c SS |
1309 | static int security_sid_to_context_core(struct selinux_state *state, |
1310 | u32 sid, char **scontext, | |
fede1483 OM |
1311 | u32 *scontext_len, int force, |
1312 | int only_invalid) | |
1da177e4 | 1313 | { |
aa8e712c SS |
1314 | struct policydb *policydb; |
1315 | struct sidtab *sidtab; | |
d97bd23c | 1316 | struct sidtab_entry *entry; |
1da177e4 LT |
1317 | int rc = 0; |
1318 | ||
d5630b9d EP |
1319 | if (scontext) |
1320 | *scontext = NULL; | |
4f4acf3a SS |
1321 | *scontext_len = 0; |
1322 | ||
65cddd50 | 1323 | if (!selinux_initialized(state)) { |
1da177e4 LT |
1324 | if (sid <= SECINITSID_NUM) { |
1325 | char *scontextp; | |
1326 | ||
1327 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; | |
d5630b9d EP |
1328 | if (!scontext) |
1329 | goto out; | |
aa736c36 RV |
1330 | scontextp = kmemdup(initial_sid_to_string[sid], |
1331 | *scontext_len, GFP_ATOMIC); | |
0cccca06 SH |
1332 | if (!scontextp) { |
1333 | rc = -ENOMEM; | |
1334 | goto out; | |
1335 | } | |
1da177e4 LT |
1336 | *scontext = scontextp; |
1337 | goto out; | |
1338 | } | |
b54c85c1 | 1339 | pr_err("SELinux: %s: called before initial " |
744ba35e | 1340 | "load_policy on unknown SID %d\n", __func__, sid); |
1da177e4 LT |
1341 | rc = -EINVAL; |
1342 | goto out; | |
1343 | } | |
aa8e712c SS |
1344 | read_lock(&state->ss->policy_rwlock); |
1345 | policydb = &state->ss->policydb; | |
24ed7fda | 1346 | sidtab = state->ss->sidtab; |
d97bd23c | 1347 | |
12b29f34 | 1348 | if (force) |
d97bd23c | 1349 | entry = sidtab_search_entry_force(sidtab, sid); |
12b29f34 | 1350 | else |
d97bd23c OM |
1351 | entry = sidtab_search_entry(sidtab, sid); |
1352 | if (!entry) { | |
b54c85c1 | 1353 | pr_err("SELinux: %s: unrecognized SID %d\n", |
744ba35e | 1354 | __func__, sid); |
1da177e4 LT |
1355 | rc = -EINVAL; |
1356 | goto out_unlock; | |
1357 | } | |
d97bd23c OM |
1358 | if (only_invalid && !entry->context.len) |
1359 | goto out_unlock; | |
1360 | ||
1361 | rc = sidtab_entry_to_string(policydb, sidtab, entry, scontext, | |
1362 | scontext_len); | |
1363 | ||
1da177e4 | 1364 | out_unlock: |
aa8e712c | 1365 | read_unlock(&state->ss->policy_rwlock); |
1da177e4 LT |
1366 | out: |
1367 | return rc; | |
1368 | ||
1369 | } | |
1370 | ||
12b29f34 SS |
1371 | /** |
1372 | * security_sid_to_context - Obtain a context for a given SID. | |
1373 | * @sid: security identifier, SID | |
1374 | * @scontext: security context | |
1375 | * @scontext_len: length in bytes | |
1376 | * | |
1377 | * Write the string representation of the context associated with @sid | |
1378 | * into a dynamically allocated string of the correct size. Set @scontext | |
1379 | * to point to this string and set @scontext_len to the length of the string. | |
1380 | */ | |
aa8e712c SS |
1381 | int security_sid_to_context(struct selinux_state *state, |
1382 | u32 sid, char **scontext, u32 *scontext_len) | |
1da177e4 | 1383 | { |
aa8e712c | 1384 | return security_sid_to_context_core(state, sid, scontext, |
fede1483 | 1385 | scontext_len, 0, 0); |
12b29f34 SS |
1386 | } |
1387 | ||
aa8e712c SS |
1388 | int security_sid_to_context_force(struct selinux_state *state, u32 sid, |
1389 | char **scontext, u32 *scontext_len) | |
12b29f34 | 1390 | { |
aa8e712c | 1391 | return security_sid_to_context_core(state, sid, scontext, |
fede1483 OM |
1392 | scontext_len, 1, 0); |
1393 | } | |
1394 | ||
1395 | /** | |
1396 | * security_sid_to_context_inval - Obtain a context for a given SID if it | |
1397 | * is invalid. | |
1398 | * @sid: security identifier, SID | |
1399 | * @scontext: security context | |
1400 | * @scontext_len: length in bytes | |
1401 | * | |
1402 | * Write the string representation of the context associated with @sid | |
1403 | * into a dynamically allocated string of the correct size, but only if the | |
1404 | * context is invalid in the current policy. Set @scontext to point to | |
1405 | * this string (or NULL if the context is valid) and set @scontext_len to | |
1406 | * the length of the string (or 0 if the context is valid). | |
1407 | */ | |
1408 | int security_sid_to_context_inval(struct selinux_state *state, u32 sid, | |
1409 | char **scontext, u32 *scontext_len) | |
1410 | { | |
1411 | return security_sid_to_context_core(state, sid, scontext, | |
1412 | scontext_len, 1, 1); | |
12b29f34 SS |
1413 | } |
1414 | ||
9a59daa0 SS |
1415 | /* |
1416 | * Caveat: Mutates scontext. | |
1417 | */ | |
12b29f34 SS |
1418 | static int string_to_context_struct(struct policydb *pol, |
1419 | struct sidtab *sidtabp, | |
9a59daa0 | 1420 | char *scontext, |
12b29f34 | 1421 | struct context *ctx, |
9a59daa0 | 1422 | u32 def_sid) |
12b29f34 | 1423 | { |
1da177e4 LT |
1424 | struct role_datum *role; |
1425 | struct type_datum *typdatum; | |
1426 | struct user_datum *usrdatum; | |
1427 | char *scontextp, *p, oldc; | |
1428 | int rc = 0; | |
1429 | ||
12b29f34 | 1430 | context_init(ctx); |
1da177e4 | 1431 | |
1da177e4 LT |
1432 | /* Parse the security context. */ |
1433 | ||
1434 | rc = -EINVAL; | |
9a59daa0 | 1435 | scontextp = (char *) scontext; |
1da177e4 LT |
1436 | |
1437 | /* Extract the user. */ | |
1438 | p = scontextp; | |
1439 | while (*p && *p != ':') | |
1440 | p++; | |
1441 | ||
1442 | if (*p == 0) | |
12b29f34 | 1443 | goto out; |
1da177e4 LT |
1444 | |
1445 | *p++ = 0; | |
1446 | ||
12b29f34 | 1447 | usrdatum = hashtab_search(pol->p_users.table, scontextp); |
1da177e4 | 1448 | if (!usrdatum) |
12b29f34 | 1449 | goto out; |
1da177e4 | 1450 | |
12b29f34 | 1451 | ctx->user = usrdatum->value; |
1da177e4 LT |
1452 | |
1453 | /* Extract role. */ | |
1454 | scontextp = p; | |
1455 | while (*p && *p != ':') | |
1456 | p++; | |
1457 | ||
1458 | if (*p == 0) | |
12b29f34 | 1459 | goto out; |
1da177e4 LT |
1460 | |
1461 | *p++ = 0; | |
1462 | ||
12b29f34 | 1463 | role = hashtab_search(pol->p_roles.table, scontextp); |
1da177e4 | 1464 | if (!role) |
12b29f34 SS |
1465 | goto out; |
1466 | ctx->role = role->value; | |
1da177e4 LT |
1467 | |
1468 | /* Extract type. */ | |
1469 | scontextp = p; | |
1470 | while (*p && *p != ':') | |
1471 | p++; | |
1472 | oldc = *p; | |
1473 | *p++ = 0; | |
1474 | ||
12b29f34 | 1475 | typdatum = hashtab_search(pol->p_types.table, scontextp); |
d9250dea | 1476 | if (!typdatum || typdatum->attribute) |
12b29f34 | 1477 | goto out; |
1da177e4 | 1478 | |
12b29f34 | 1479 | ctx->type = typdatum->value; |
1da177e4 | 1480 | |
95ffe194 | 1481 | rc = mls_context_to_sid(pol, oldc, p, ctx, sidtabp, def_sid); |
1da177e4 | 1482 | if (rc) |
12b29f34 | 1483 | goto out; |
1da177e4 | 1484 | |
1da177e4 | 1485 | /* Check the validity of the new context. */ |
95ffe194 | 1486 | rc = -EINVAL; |
4b02b524 | 1487 | if (!policydb_context_isvalid(pol, ctx)) |
12b29f34 | 1488 | goto out; |
12b29f34 SS |
1489 | rc = 0; |
1490 | out: | |
8e531af9 EP |
1491 | if (rc) |
1492 | context_destroy(ctx); | |
12b29f34 SS |
1493 | return rc; |
1494 | } | |
1495 | ||
66f8e2f0 JVS |
1496 | int context_add_hash(struct policydb *policydb, |
1497 | struct context *context) | |
1498 | { | |
1499 | int rc; | |
1500 | char *str; | |
1501 | int len; | |
1502 | ||
1503 | if (context->str) { | |
1504 | context->hash = context_compute_hash(context->str); | |
1505 | } else { | |
1506 | rc = context_struct_to_string(policydb, context, | |
1507 | &str, &len); | |
1508 | if (rc) | |
1509 | return rc; | |
1510 | context->hash = context_compute_hash(str); | |
1511 | kfree(str); | |
1512 | } | |
1513 | return 0; | |
1514 | } | |
1515 | ||
1516 | static int context_struct_to_sid(struct selinux_state *state, | |
1517 | struct context *context, u32 *sid) | |
1518 | { | |
1519 | int rc; | |
1520 | struct sidtab *sidtab = state->ss->sidtab; | |
1521 | struct policydb *policydb = &state->ss->policydb; | |
1522 | ||
1523 | if (!context->hash) { | |
1524 | rc = context_add_hash(policydb, context); | |
1525 | if (rc) | |
1526 | return rc; | |
1527 | } | |
1528 | ||
1529 | return sidtab_context_to_sid(sidtab, context, sid); | |
1530 | } | |
1531 | ||
aa8e712c SS |
1532 | static int security_context_to_sid_core(struct selinux_state *state, |
1533 | const char *scontext, u32 scontext_len, | |
12b29f34 SS |
1534 | u32 *sid, u32 def_sid, gfp_t gfp_flags, |
1535 | int force) | |
1536 | { | |
aa8e712c SS |
1537 | struct policydb *policydb; |
1538 | struct sidtab *sidtab; | |
9a59daa0 | 1539 | char *scontext2, *str = NULL; |
12b29f34 SS |
1540 | struct context context; |
1541 | int rc = 0; | |
1542 | ||
2172fa70 SS |
1543 | /* An empty security context is never valid. */ |
1544 | if (!scontext_len) | |
1545 | return -EINVAL; | |
1546 | ||
ef28df55 PM |
1547 | /* Copy the string to allow changes and ensure a NUL terminator */ |
1548 | scontext2 = kmemdup_nul(scontext, scontext_len, gfp_flags); | |
1549 | if (!scontext2) | |
1550 | return -ENOMEM; | |
1551 | ||
65cddd50 | 1552 | if (!selinux_initialized(state)) { |
12b29f34 SS |
1553 | int i; |
1554 | ||
1555 | for (i = 1; i < SECINITSID_NUM; i++) { | |
ef28df55 | 1556 | if (!strcmp(initial_sid_to_string[i], scontext2)) { |
12b29f34 | 1557 | *sid = i; |
ef28df55 | 1558 | goto out; |
12b29f34 SS |
1559 | } |
1560 | } | |
1561 | *sid = SECINITSID_KERNEL; | |
ef28df55 | 1562 | goto out; |
12b29f34 SS |
1563 | } |
1564 | *sid = SECSID_NULL; | |
1565 | ||
9a59daa0 SS |
1566 | if (force) { |
1567 | /* Save another copy for storing in uninterpreted form */ | |
4b02b524 | 1568 | rc = -ENOMEM; |
9a59daa0 | 1569 | str = kstrdup(scontext2, gfp_flags); |
4b02b524 EP |
1570 | if (!str) |
1571 | goto out; | |
9a59daa0 | 1572 | } |
aa8e712c SS |
1573 | read_lock(&state->ss->policy_rwlock); |
1574 | policydb = &state->ss->policydb; | |
24ed7fda | 1575 | sidtab = state->ss->sidtab; |
aa8e712c | 1576 | rc = string_to_context_struct(policydb, sidtab, scontext2, |
95ffe194 | 1577 | &context, def_sid); |
12b29f34 | 1578 | if (rc == -EINVAL && force) { |
9a59daa0 | 1579 | context.str = str; |
efe3de79 | 1580 | context.len = strlen(str) + 1; |
9a59daa0 | 1581 | str = NULL; |
12b29f34 | 1582 | } else if (rc) |
4b02b524 | 1583 | goto out_unlock; |
66f8e2f0 | 1584 | rc = context_struct_to_sid(state, &context, sid); |
8e531af9 | 1585 | context_destroy(&context); |
4b02b524 | 1586 | out_unlock: |
aa8e712c | 1587 | read_unlock(&state->ss->policy_rwlock); |
4b02b524 | 1588 | out: |
9a59daa0 SS |
1589 | kfree(scontext2); |
1590 | kfree(str); | |
1da177e4 LT |
1591 | return rc; |
1592 | } | |
1593 | ||
f5c1d5b2 JM |
1594 | /** |
1595 | * security_context_to_sid - Obtain a SID for a given security context. | |
1596 | * @scontext: security context | |
1597 | * @scontext_len: length in bytes | |
1598 | * @sid: security identifier, SID | |
52a4c640 | 1599 | * @gfp: context for the allocation |
f5c1d5b2 JM |
1600 | * |
1601 | * Obtains a SID associated with the security context that | |
1602 | * has the string representation specified by @scontext. | |
1603 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient | |
1604 | * memory is available, or 0 on success. | |
1605 | */ | |
aa8e712c SS |
1606 | int security_context_to_sid(struct selinux_state *state, |
1607 | const char *scontext, u32 scontext_len, u32 *sid, | |
52a4c640 | 1608 | gfp_t gfp) |
f5c1d5b2 | 1609 | { |
aa8e712c | 1610 | return security_context_to_sid_core(state, scontext, scontext_len, |
52a4c640 | 1611 | sid, SECSID_NULL, gfp, 0); |
44be2f65 RV |
1612 | } |
1613 | ||
aa8e712c SS |
1614 | int security_context_str_to_sid(struct selinux_state *state, |
1615 | const char *scontext, u32 *sid, gfp_t gfp) | |
44be2f65 | 1616 | { |
aa8e712c SS |
1617 | return security_context_to_sid(state, scontext, strlen(scontext), |
1618 | sid, gfp); | |
f5c1d5b2 JM |
1619 | } |
1620 | ||
1621 | /** | |
1622 | * security_context_to_sid_default - Obtain a SID for a given security context, | |
1623 | * falling back to specified default if needed. | |
1624 | * | |
1625 | * @scontext: security context | |
1626 | * @scontext_len: length in bytes | |
1627 | * @sid: security identifier, SID | |
d133a960 | 1628 | * @def_sid: default SID to assign on error |
f5c1d5b2 JM |
1629 | * |
1630 | * Obtains a SID associated with the security context that | |
1631 | * has the string representation specified by @scontext. | |
1632 | * The default SID is passed to the MLS layer to be used to allow | |
1633 | * kernel labeling of the MLS field if the MLS field is not present | |
1634 | * (for upgrading to MLS without full relabel). | |
12b29f34 | 1635 | * Implicitly forces adding of the context even if it cannot be mapped yet. |
f5c1d5b2 JM |
1636 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
1637 | * memory is available, or 0 on success. | |
1638 | */ | |
aa8e712c SS |
1639 | int security_context_to_sid_default(struct selinux_state *state, |
1640 | const char *scontext, u32 scontext_len, | |
7bf570dc | 1641 | u32 *sid, u32 def_sid, gfp_t gfp_flags) |
f5c1d5b2 | 1642 | { |
aa8e712c | 1643 | return security_context_to_sid_core(state, scontext, scontext_len, |
12b29f34 SS |
1644 | sid, def_sid, gfp_flags, 1); |
1645 | } | |
1646 | ||
aa8e712c SS |
1647 | int security_context_to_sid_force(struct selinux_state *state, |
1648 | const char *scontext, u32 scontext_len, | |
12b29f34 SS |
1649 | u32 *sid) |
1650 | { | |
aa8e712c | 1651 | return security_context_to_sid_core(state, scontext, scontext_len, |
12b29f34 | 1652 | sid, SECSID_NULL, GFP_KERNEL, 1); |
f5c1d5b2 JM |
1653 | } |
1654 | ||
1da177e4 | 1655 | static int compute_sid_handle_invalid_context( |
aa8e712c | 1656 | struct selinux_state *state, |
d97bd23c OM |
1657 | struct sidtab_entry *sentry, |
1658 | struct sidtab_entry *tentry, | |
1da177e4 LT |
1659 | u16 tclass, |
1660 | struct context *newcontext) | |
1661 | { | |
aa8e712c | 1662 | struct policydb *policydb = &state->ss->policydb; |
d97bd23c | 1663 | struct sidtab *sidtab = state->ss->sidtab; |
1da177e4 LT |
1664 | char *s = NULL, *t = NULL, *n = NULL; |
1665 | u32 slen, tlen, nlen; | |
ea74a685 | 1666 | struct audit_buffer *ab; |
1da177e4 | 1667 | |
d97bd23c | 1668 | if (sidtab_entry_to_string(policydb, sidtab, sentry, &s, &slen)) |
1da177e4 | 1669 | goto out; |
d97bd23c | 1670 | if (sidtab_entry_to_string(policydb, sidtab, tentry, &t, &tlen)) |
1da177e4 | 1671 | goto out; |
aa8e712c | 1672 | if (context_struct_to_string(policydb, newcontext, &n, &nlen)) |
1da177e4 | 1673 | goto out; |
ea74a685 RGB |
1674 | ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR); |
1675 | audit_log_format(ab, | |
1676 | "op=security_compute_sid invalid_context="); | |
1677 | /* no need to record the NUL with untrusted strings */ | |
1678 | audit_log_n_untrustedstring(ab, n, nlen - 1); | |
1679 | audit_log_format(ab, " scontext=%s tcontext=%s tclass=%s", | |
1680 | s, t, sym_name(policydb, SYM_CLASSES, tclass-1)); | |
1681 | audit_log_end(ab); | |
1da177e4 LT |
1682 | out: |
1683 | kfree(s); | |
1684 | kfree(t); | |
1685 | kfree(n); | |
e5a5ca96 | 1686 | if (!enforcing_enabled(state)) |
1da177e4 LT |
1687 | return 0; |
1688 | return -EACCES; | |
1689 | } | |
1690 | ||
aa8e712c SS |
1691 | static void filename_compute_type(struct policydb *policydb, |
1692 | struct context *newcontext, | |
2667991f | 1693 | u32 stype, u32 ttype, u16 tclass, |
f50a3ec9 | 1694 | const char *objname) |
652bb9b0 | 1695 | { |
2463c26d EP |
1696 | struct filename_trans ft; |
1697 | struct filename_trans_datum *otype; | |
03a4c018 EP |
1698 | |
1699 | /* | |
1700 | * Most filename trans rules are going to live in specific directories | |
1701 | * like /dev or /var/run. This bitmap will quickly skip rule searches | |
1702 | * if the ttype does not contain any rules. | |
1703 | */ | |
aa8e712c | 1704 | if (!ebitmap_get_bit(&policydb->filename_trans_ttypes, ttype)) |
03a4c018 EP |
1705 | return; |
1706 | ||
2463c26d EP |
1707 | ft.stype = stype; |
1708 | ft.ttype = ttype; | |
1709 | ft.tclass = tclass; | |
1710 | ft.name = objname; | |
1711 | ||
aa8e712c | 1712 | otype = hashtab_search(policydb->filename_trans, &ft); |
2463c26d EP |
1713 | if (otype) |
1714 | newcontext->type = otype->otype; | |
652bb9b0 EP |
1715 | } |
1716 | ||
aa8e712c SS |
1717 | static int security_compute_sid(struct selinux_state *state, |
1718 | u32 ssid, | |
1da177e4 | 1719 | u32 tsid, |
c6d3aaa4 | 1720 | u16 orig_tclass, |
1da177e4 | 1721 | u32 specified, |
f50a3ec9 | 1722 | const char *objname, |
c6d3aaa4 SS |
1723 | u32 *out_sid, |
1724 | bool kern) | |
1da177e4 | 1725 | { |
aa8e712c SS |
1726 | struct policydb *policydb; |
1727 | struct sidtab *sidtab; | |
aa893269 | 1728 | struct class_datum *cladatum = NULL; |
d97bd23c OM |
1729 | struct context *scontext, *tcontext, newcontext; |
1730 | struct sidtab_entry *sentry, *tentry; | |
1da177e4 LT |
1731 | struct role_trans *roletr = NULL; |
1732 | struct avtab_key avkey; | |
1733 | struct avtab_datum *avdatum; | |
1734 | struct avtab_node *node; | |
c6d3aaa4 | 1735 | u16 tclass; |
1da177e4 | 1736 | int rc = 0; |
6f5317e7 | 1737 | bool sock; |
1da177e4 | 1738 | |
65cddd50 | 1739 | if (!selinux_initialized(state)) { |
c6d3aaa4 SS |
1740 | switch (orig_tclass) { |
1741 | case SECCLASS_PROCESS: /* kernel value */ | |
1da177e4 LT |
1742 | *out_sid = ssid; |
1743 | break; | |
1744 | default: | |
1745 | *out_sid = tsid; | |
1746 | break; | |
1747 | } | |
1748 | goto out; | |
1749 | } | |
1750 | ||
851f8a69 VY |
1751 | context_init(&newcontext); |
1752 | ||
aa8e712c | 1753 | read_lock(&state->ss->policy_rwlock); |
1da177e4 | 1754 | |
6f5317e7 | 1755 | if (kern) { |
aa8e712c | 1756 | tclass = unmap_class(&state->ss->map, orig_tclass); |
6f5317e7 HC |
1757 | sock = security_is_socket_class(orig_tclass); |
1758 | } else { | |
c6d3aaa4 | 1759 | tclass = orig_tclass; |
aa8e712c SS |
1760 | sock = security_is_socket_class(map_class(&state->ss->map, |
1761 | tclass)); | |
6f5317e7 | 1762 | } |
c6d3aaa4 | 1763 | |
aa8e712c | 1764 | policydb = &state->ss->policydb; |
24ed7fda | 1765 | sidtab = state->ss->sidtab; |
aa8e712c | 1766 | |
d97bd23c OM |
1767 | sentry = sidtab_search_entry(sidtab, ssid); |
1768 | if (!sentry) { | |
b54c85c1 | 1769 | pr_err("SELinux: %s: unrecognized SID %d\n", |
744ba35e | 1770 | __func__, ssid); |
1da177e4 LT |
1771 | rc = -EINVAL; |
1772 | goto out_unlock; | |
1773 | } | |
d97bd23c OM |
1774 | tentry = sidtab_search_entry(sidtab, tsid); |
1775 | if (!tentry) { | |
b54c85c1 | 1776 | pr_err("SELinux: %s: unrecognized SID %d\n", |
744ba35e | 1777 | __func__, tsid); |
1da177e4 LT |
1778 | rc = -EINVAL; |
1779 | goto out_unlock; | |
1780 | } | |
1781 | ||
d97bd23c OM |
1782 | scontext = &sentry->context; |
1783 | tcontext = &tentry->context; | |
1784 | ||
aa8e712c SS |
1785 | if (tclass && tclass <= policydb->p_classes.nprim) |
1786 | cladatum = policydb->class_val_to_struct[tclass - 1]; | |
aa893269 | 1787 | |
1da177e4 LT |
1788 | /* Set the user identity. */ |
1789 | switch (specified) { | |
1790 | case AVTAB_TRANSITION: | |
1791 | case AVTAB_CHANGE: | |
aa893269 EP |
1792 | if (cladatum && cladatum->default_user == DEFAULT_TARGET) { |
1793 | newcontext.user = tcontext->user; | |
1794 | } else { | |
1795 | /* notice this gets both DEFAULT_SOURCE and unset */ | |
1796 | /* Use the process user identity. */ | |
1797 | newcontext.user = scontext->user; | |
1798 | } | |
1da177e4 LT |
1799 | break; |
1800 | case AVTAB_MEMBER: | |
1801 | /* Use the related object owner. */ | |
1802 | newcontext.user = tcontext->user; | |
1803 | break; | |
1804 | } | |
1805 | ||
aa893269 EP |
1806 | /* Set the role to default values. */ |
1807 | if (cladatum && cladatum->default_role == DEFAULT_SOURCE) { | |
1da177e4 | 1808 | newcontext.role = scontext->role; |
aa893269 EP |
1809 | } else if (cladatum && cladatum->default_role == DEFAULT_TARGET) { |
1810 | newcontext.role = tcontext->role; | |
1811 | } else { | |
aa8e712c | 1812 | if ((tclass == policydb->process_class) || (sock == true)) |
aa893269 EP |
1813 | newcontext.role = scontext->role; |
1814 | else | |
1815 | newcontext.role = OBJECT_R_VAL; | |
1816 | } | |
1817 | ||
1818 | /* Set the type to default values. */ | |
eed7795d | 1819 | if (cladatum && cladatum->default_type == DEFAULT_SOURCE) { |
1da177e4 | 1820 | newcontext.type = scontext->type; |
eed7795d | 1821 | } else if (cladatum && cladatum->default_type == DEFAULT_TARGET) { |
1da177e4 | 1822 | newcontext.type = tcontext->type; |
eed7795d | 1823 | } else { |
aa8e712c | 1824 | if ((tclass == policydb->process_class) || (sock == true)) { |
eed7795d EP |
1825 | /* Use the type of process. */ |
1826 | newcontext.type = scontext->type; | |
1827 | } else { | |
1828 | /* Use the type of the related object. */ | |
1829 | newcontext.type = tcontext->type; | |
1830 | } | |
1da177e4 LT |
1831 | } |
1832 | ||
1833 | /* Look for a type transition/member/change rule. */ | |
1834 | avkey.source_type = scontext->type; | |
1835 | avkey.target_type = tcontext->type; | |
1836 | avkey.target_class = tclass; | |
782ebb99 | 1837 | avkey.specified = specified; |
aa8e712c | 1838 | avdatum = avtab_search(&policydb->te_avtab, &avkey); |
1da177e4 LT |
1839 | |
1840 | /* If no permanent rule, also check for enabled conditional rules */ | |
5d55a345 | 1841 | if (!avdatum) { |
aa8e712c | 1842 | node = avtab_search_node(&policydb->te_cond_avtab, &avkey); |
dbc74c65 | 1843 | for (; node; node = avtab_search_node_next(node, specified)) { |
782ebb99 | 1844 | if (node->key.specified & AVTAB_ENABLED) { |
1da177e4 LT |
1845 | avdatum = &node->datum; |
1846 | break; | |
1847 | } | |
1848 | } | |
1849 | } | |
1850 | ||
782ebb99 | 1851 | if (avdatum) { |
1da177e4 | 1852 | /* Use the type from the type transition/member/change rule. */ |
fa1aa143 | 1853 | newcontext.type = avdatum->u.data; |
1da177e4 LT |
1854 | } |
1855 | ||
4742600c | 1856 | /* if we have a objname this is a file trans check so check those rules */ |
f50a3ec9 | 1857 | if (objname) |
aa8e712c | 1858 | filename_compute_type(policydb, &newcontext, scontext->type, |
f50a3ec9 | 1859 | tcontext->type, tclass, objname); |
652bb9b0 | 1860 | |
1da177e4 | 1861 | /* Check for class-specific changes. */ |
63a312ca HC |
1862 | if (specified & AVTAB_TRANSITION) { |
1863 | /* Look for a role transition rule. */ | |
aa8e712c SS |
1864 | for (roletr = policydb->role_tr; roletr; |
1865 | roletr = roletr->next) { | |
63a312ca HC |
1866 | if ((roletr->role == scontext->role) && |
1867 | (roletr->type == tcontext->type) && | |
1868 | (roletr->tclass == tclass)) { | |
1869 | /* Use the role transition rule. */ | |
1870 | newcontext.role = roletr->new_role; | |
1871 | break; | |
1da177e4 LT |
1872 | } |
1873 | } | |
1da177e4 LT |
1874 | } |
1875 | ||
1876 | /* Set the MLS attributes. | |
1877 | This is done last because it may allocate memory. */ | |
aa8e712c | 1878 | rc = mls_compute_sid(policydb, scontext, tcontext, tclass, specified, |
6f5317e7 | 1879 | &newcontext, sock); |
1da177e4 LT |
1880 | if (rc) |
1881 | goto out_unlock; | |
1882 | ||
1883 | /* Check the validity of the context. */ | |
aa8e712c | 1884 | if (!policydb_context_isvalid(policydb, &newcontext)) { |
d97bd23c OM |
1885 | rc = compute_sid_handle_invalid_context(state, sentry, tentry, |
1886 | tclass, &newcontext); | |
1da177e4 LT |
1887 | if (rc) |
1888 | goto out_unlock; | |
1889 | } | |
1890 | /* Obtain the sid for the context. */ | |
66f8e2f0 | 1891 | rc = context_struct_to_sid(state, &newcontext, out_sid); |
1da177e4 | 1892 | out_unlock: |
aa8e712c | 1893 | read_unlock(&state->ss->policy_rwlock); |
1da177e4 LT |
1894 | context_destroy(&newcontext); |
1895 | out: | |
1896 | return rc; | |
1897 | } | |
1898 | ||
1899 | /** | |
1900 | * security_transition_sid - Compute the SID for a new subject/object. | |
1901 | * @ssid: source security identifier | |
1902 | * @tsid: target security identifier | |
1903 | * @tclass: target security class | |
1904 | * @out_sid: security identifier for new subject/object | |
1905 | * | |
1906 | * Compute a SID to use for labeling a new subject or object in the | |
1907 | * class @tclass based on a SID pair (@ssid, @tsid). | |
1908 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1909 | * if insufficient memory is available, or %0 if the new SID was | |
1910 | * computed successfully. | |
1911 | */ | |
aa8e712c SS |
1912 | int security_transition_sid(struct selinux_state *state, |
1913 | u32 ssid, u32 tsid, u16 tclass, | |
652bb9b0 | 1914 | const struct qstr *qstr, u32 *out_sid) |
1da177e4 | 1915 | { |
aa8e712c SS |
1916 | return security_compute_sid(state, ssid, tsid, tclass, |
1917 | AVTAB_TRANSITION, | |
f50a3ec9 | 1918 | qstr ? qstr->name : NULL, out_sid, true); |
c6d3aaa4 SS |
1919 | } |
1920 | ||
aa8e712c SS |
1921 | int security_transition_sid_user(struct selinux_state *state, |
1922 | u32 ssid, u32 tsid, u16 tclass, | |
f50a3ec9 | 1923 | const char *objname, u32 *out_sid) |
c6d3aaa4 | 1924 | { |
aa8e712c SS |
1925 | return security_compute_sid(state, ssid, tsid, tclass, |
1926 | AVTAB_TRANSITION, | |
f50a3ec9 | 1927 | objname, out_sid, false); |
1da177e4 LT |
1928 | } |
1929 | ||
1930 | /** | |
1931 | * security_member_sid - Compute the SID for member selection. | |
1932 | * @ssid: source security identifier | |
1933 | * @tsid: target security identifier | |
1934 | * @tclass: target security class | |
1935 | * @out_sid: security identifier for selected member | |
1936 | * | |
1937 | * Compute a SID to use when selecting a member of a polyinstantiated | |
1938 | * object of class @tclass based on a SID pair (@ssid, @tsid). | |
1939 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1940 | * if insufficient memory is available, or %0 if the SID was | |
1941 | * computed successfully. | |
1942 | */ | |
aa8e712c SS |
1943 | int security_member_sid(struct selinux_state *state, |
1944 | u32 ssid, | |
1da177e4 LT |
1945 | u32 tsid, |
1946 | u16 tclass, | |
1947 | u32 *out_sid) | |
1948 | { | |
aa8e712c SS |
1949 | return security_compute_sid(state, ssid, tsid, tclass, |
1950 | AVTAB_MEMBER, NULL, | |
652bb9b0 | 1951 | out_sid, false); |
1da177e4 LT |
1952 | } |
1953 | ||
1954 | /** | |
1955 | * security_change_sid - Compute the SID for object relabeling. | |
1956 | * @ssid: source security identifier | |
1957 | * @tsid: target security identifier | |
1958 | * @tclass: target security class | |
1959 | * @out_sid: security identifier for selected member | |
1960 | * | |
1961 | * Compute a SID to use for relabeling an object of class @tclass | |
1962 | * based on a SID pair (@ssid, @tsid). | |
1963 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM | |
1964 | * if insufficient memory is available, or %0 if the SID was | |
1965 | * computed successfully. | |
1966 | */ | |
aa8e712c SS |
1967 | int security_change_sid(struct selinux_state *state, |
1968 | u32 ssid, | |
1da177e4 LT |
1969 | u32 tsid, |
1970 | u16 tclass, | |
1971 | u32 *out_sid) | |
1972 | { | |
aa8e712c SS |
1973 | return security_compute_sid(state, |
1974 | ssid, tsid, tclass, AVTAB_CHANGE, NULL, | |
652bb9b0 | 1975 | out_sid, false); |
b94c7e67 CS |
1976 | } |
1977 | ||
aa8e712c SS |
1978 | static inline int convert_context_handle_invalid_context( |
1979 | struct selinux_state *state, | |
1980 | struct context *context) | |
1da177e4 | 1981 | { |
aa8e712c | 1982 | struct policydb *policydb = &state->ss->policydb; |
4b02b524 EP |
1983 | char *s; |
1984 | u32 len; | |
1da177e4 | 1985 | |
e5a5ca96 | 1986 | if (enforcing_enabled(state)) |
4b02b524 EP |
1987 | return -EINVAL; |
1988 | ||
aa8e712c | 1989 | if (!context_struct_to_string(policydb, context, &s, &len)) { |
b54c85c1 | 1990 | pr_warn("SELinux: Context %s would be invalid if enforcing\n", |
1991 | s); | |
4b02b524 | 1992 | kfree(s); |
1da177e4 | 1993 | } |
4b02b524 | 1994 | return 0; |
1da177e4 LT |
1995 | } |
1996 | ||
1997 | struct convert_context_args { | |
aa8e712c | 1998 | struct selinux_state *state; |
1da177e4 LT |
1999 | struct policydb *oldp; |
2000 | struct policydb *newp; | |
2001 | }; | |
2002 | ||
2003 | /* | |
2004 | * Convert the values in the security context | |
ee1a84fd | 2005 | * structure `oldc' from the values specified |
1da177e4 | 2006 | * in the policy `p->oldp' to the values specified |
ee1a84fd OM |
2007 | * in the policy `p->newp', storing the new context |
2008 | * in `newc'. Verify that the context is valid | |
2009 | * under the new policy. | |
1da177e4 | 2010 | */ |
ee1a84fd | 2011 | static int convert_context(struct context *oldc, struct context *newc, void *p) |
1da177e4 LT |
2012 | { |
2013 | struct convert_context_args *args; | |
0719aaf5 | 2014 | struct ocontext *oc; |
1da177e4 LT |
2015 | struct role_datum *role; |
2016 | struct type_datum *typdatum; | |
2017 | struct user_datum *usrdatum; | |
2018 | char *s; | |
2019 | u32 len; | |
24ed7fda | 2020 | int rc; |
1da177e4 LT |
2021 | |
2022 | args = p; | |
2023 | ||
ee1a84fd OM |
2024 | if (oldc->str) { |
2025 | s = kstrdup(oldc->str, GFP_KERNEL); | |
4b02b524 | 2026 | if (!s) |
ee1a84fd | 2027 | return -ENOMEM; |
4b02b524 | 2028 | |
9a59daa0 | 2029 | rc = string_to_context_struct(args->newp, NULL, s, |
ee1a84fd OM |
2030 | newc, SECSID_NULL); |
2031 | if (rc == -EINVAL) { | |
2a524393 OM |
2032 | /* |
2033 | * Retain string representation for later mapping. | |
2034 | * | |
2035 | * IMPORTANT: We need to copy the contents of oldc->str | |
2036 | * back into s again because string_to_context_struct() | |
2037 | * may have garbled it. | |
2038 | */ | |
2039 | memcpy(s, oldc->str, oldc->len); | |
ee1a84fd OM |
2040 | context_init(newc); |
2041 | newc->str = s; | |
2042 | newc->len = oldc->len; | |
66f8e2f0 | 2043 | newc->hash = oldc->hash; |
ee1a84fd OM |
2044 | return 0; |
2045 | } | |
2046 | kfree(s); | |
2047 | if (rc) { | |
12b29f34 | 2048 | /* Other error condition, e.g. ENOMEM. */ |
b54c85c1 | 2049 | pr_err("SELinux: Unable to map context %s, rc = %d.\n", |
ee1a84fd OM |
2050 | oldc->str, -rc); |
2051 | return rc; | |
12b29f34 | 2052 | } |
ee1a84fd OM |
2053 | pr_info("SELinux: Context %s became valid (mapped).\n", |
2054 | oldc->str); | |
2055 | return 0; | |
12b29f34 SS |
2056 | } |
2057 | ||
ee1a84fd | 2058 | context_init(newc); |
1da177e4 | 2059 | |
1da177e4 | 2060 | /* Convert the user. */ |
4b02b524 | 2061 | rc = -EINVAL; |
1da177e4 | 2062 | usrdatum = hashtab_search(args->newp->p_users.table, |
ee1a84fd OM |
2063 | sym_name(args->oldp, |
2064 | SYM_USERS, oldc->user - 1)); | |
5d55a345 | 2065 | if (!usrdatum) |
1da177e4 | 2066 | goto bad; |
ee1a84fd | 2067 | newc->user = usrdatum->value; |
1da177e4 LT |
2068 | |
2069 | /* Convert the role. */ | |
4b02b524 | 2070 | rc = -EINVAL; |
1da177e4 | 2071 | role = hashtab_search(args->newp->p_roles.table, |
ee1a84fd | 2072 | sym_name(args->oldp, SYM_ROLES, oldc->role - 1)); |
5d55a345 | 2073 | if (!role) |
1da177e4 | 2074 | goto bad; |
ee1a84fd | 2075 | newc->role = role->value; |
1da177e4 LT |
2076 | |
2077 | /* Convert the type. */ | |
4b02b524 | 2078 | rc = -EINVAL; |
1da177e4 | 2079 | typdatum = hashtab_search(args->newp->p_types.table, |
ee1a84fd OM |
2080 | sym_name(args->oldp, |
2081 | SYM_TYPES, oldc->type - 1)); | |
5d55a345 | 2082 | if (!typdatum) |
1da177e4 | 2083 | goto bad; |
ee1a84fd | 2084 | newc->type = typdatum->value; |
1da177e4 | 2085 | |
0719aaf5 GT |
2086 | /* Convert the MLS fields if dealing with MLS policies */ |
2087 | if (args->oldp->mls_enabled && args->newp->mls_enabled) { | |
ee1a84fd | 2088 | rc = mls_convert_context(args->oldp, args->newp, oldc, newc); |
0719aaf5 GT |
2089 | if (rc) |
2090 | goto bad; | |
0719aaf5 GT |
2091 | } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) { |
2092 | /* | |
2093 | * Switching between non-MLS and MLS policy: | |
2094 | * ensure that the MLS fields of the context for all | |
2095 | * existing entries in the sidtab are filled in with a | |
2096 | * suitable default value, likely taken from one of the | |
2097 | * initial SIDs. | |
2098 | */ | |
2099 | oc = args->newp->ocontexts[OCON_ISID]; | |
2100 | while (oc && oc->sid[0] != SECINITSID_UNLABELED) | |
2101 | oc = oc->next; | |
4b02b524 | 2102 | rc = -EINVAL; |
0719aaf5 | 2103 | if (!oc) { |
b54c85c1 | 2104 | pr_err("SELinux: unable to look up" |
0719aaf5 GT |
2105 | " the initial SIDs list\n"); |
2106 | goto bad; | |
2107 | } | |
ee1a84fd | 2108 | rc = mls_range_set(newc, &oc->context[0].range); |
0719aaf5 GT |
2109 | if (rc) |
2110 | goto bad; | |
2111 | } | |
1da177e4 LT |
2112 | |
2113 | /* Check the validity of the new context. */ | |
ee1a84fd OM |
2114 | if (!policydb_context_isvalid(args->newp, newc)) { |
2115 | rc = convert_context_handle_invalid_context(args->state, oldc); | |
1da177e4 LT |
2116 | if (rc) |
2117 | goto bad; | |
2118 | } | |
2119 | ||
66f8e2f0 JVS |
2120 | rc = context_add_hash(args->newp, newc); |
2121 | if (rc) | |
2122 | goto bad; | |
2123 | ||
ee1a84fd | 2124 | return 0; |
1da177e4 | 2125 | bad: |
12b29f34 | 2126 | /* Map old representation to string and save it. */ |
ee1a84fd | 2127 | rc = context_struct_to_string(args->oldp, oldc, &s, &len); |
4b02b524 EP |
2128 | if (rc) |
2129 | return rc; | |
ee1a84fd OM |
2130 | context_destroy(newc); |
2131 | newc->str = s; | |
2132 | newc->len = len; | |
66f8e2f0 | 2133 | newc->hash = context_compute_hash(s); |
b54c85c1 | 2134 | pr_info("SELinux: Context %s became invalid (unmapped).\n", |
ee1a84fd OM |
2135 | newc->str); |
2136 | return 0; | |
1da177e4 LT |
2137 | } |
2138 | ||
aa8e712c | 2139 | static void security_load_policycaps(struct selinux_state *state) |
3bb56b25 | 2140 | { |
aa8e712c | 2141 | struct policydb *p = &state->ss->policydb; |
4dc2fce3 SS |
2142 | unsigned int i; |
2143 | struct ebitmap_node *node; | |
2144 | ||
aa8e712c SS |
2145 | for (i = 0; i < ARRAY_SIZE(state->policycap); i++) |
2146 | state->policycap[i] = ebitmap_get_bit(&p->policycaps, i); | |
4dc2fce3 SS |
2147 | |
2148 | for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++) | |
2149 | pr_info("SELinux: policy capability %s=%d\n", | |
2150 | selinux_policycap_names[i], | |
aa8e712c | 2151 | ebitmap_get_bit(&p->policycaps, i)); |
4dc2fce3 | 2152 | |
aa8e712c | 2153 | ebitmap_for_each_positive_bit(&p->policycaps, node, i) { |
4dc2fce3 SS |
2154 | if (i >= ARRAY_SIZE(selinux_policycap_names)) |
2155 | pr_info("SELinux: unknown policy capability %u\n", | |
2156 | i); | |
2157 | } | |
3bb56b25 PM |
2158 | } |
2159 | ||
aa8e712c SS |
2160 | static int security_preserve_bools(struct selinux_state *state, |
2161 | struct policydb *newpolicydb); | |
1da177e4 LT |
2162 | |
2163 | /** | |
2164 | * security_load_policy - Load a security policy configuration. | |
2165 | * @data: binary policy data | |
2166 | * @len: length of data in bytes | |
2167 | * | |
2168 | * Load a new set of security policy configuration data, | |
2169 | * validate it and convert the SID table as necessary. | |
2170 | * This function will flush the access vector cache after | |
2171 | * loading the new policy. | |
2172 | */ | |
aa8e712c | 2173 | int security_load_policy(struct selinux_state *state, void *data, size_t len) |
1da177e4 | 2174 | { |
aa8e712c | 2175 | struct policydb *policydb; |
24ed7fda | 2176 | struct sidtab *oldsidtab, *newsidtab; |
b5495b42 | 2177 | struct policydb *oldpolicydb, *newpolicydb; |
aa8e712c SS |
2178 | struct selinux_mapping *oldmapping; |
2179 | struct selinux_map newmap; | |
ee1a84fd | 2180 | struct sidtab_convert_params convert_params; |
1da177e4 LT |
2181 | struct convert_context_args args; |
2182 | u32 seqno; | |
2183 | int rc = 0; | |
2184 | struct policy_file file = { data, len }, *fp = &file; | |
2185 | ||
6396bb22 | 2186 | oldpolicydb = kcalloc(2, sizeof(*oldpolicydb), GFP_KERNEL); |
b5495b42 TG |
2187 | if (!oldpolicydb) { |
2188 | rc = -ENOMEM; | |
2189 | goto out; | |
2190 | } | |
2191 | newpolicydb = oldpolicydb + 1; | |
2192 | ||
aa8e712c | 2193 | policydb = &state->ss->policydb; |
24ed7fda OM |
2194 | |
2195 | newsidtab = kmalloc(sizeof(*newsidtab), GFP_KERNEL); | |
2196 | if (!newsidtab) { | |
2197 | rc = -ENOMEM; | |
2198 | goto out; | |
2199 | } | |
aa8e712c | 2200 | |
65cddd50 | 2201 | if (!selinux_initialized(state)) { |
aa8e712c | 2202 | rc = policydb_read(policydb, fp); |
24ed7fda OM |
2203 | if (rc) { |
2204 | kfree(newsidtab); | |
b5495b42 | 2205 | goto out; |
24ed7fda | 2206 | } |
a2000050 | 2207 | |
aa8e712c SS |
2208 | policydb->len = len; |
2209 | rc = selinux_set_mapping(policydb, secclass_map, | |
2210 | &state->ss->map); | |
a2000050 | 2211 | if (rc) { |
24ed7fda | 2212 | kfree(newsidtab); |
aa8e712c | 2213 | policydb_destroy(policydb); |
b5495b42 | 2214 | goto out; |
1da177e4 | 2215 | } |
a2000050 | 2216 | |
24ed7fda | 2217 | rc = policydb_load_isids(policydb, newsidtab); |
a2000050 | 2218 | if (rc) { |
24ed7fda | 2219 | kfree(newsidtab); |
aa8e712c | 2220 | policydb_destroy(policydb); |
b5495b42 | 2221 | goto out; |
b94c7e67 | 2222 | } |
a2000050 | 2223 | |
24ed7fda | 2224 | state->ss->sidtab = newsidtab; |
aa8e712c | 2225 | security_load_policycaps(state); |
65cddd50 | 2226 | selinux_mark_initialized(state); |
aa8e712c | 2227 | seqno = ++state->ss->latest_granting; |
1da177e4 | 2228 | selinux_complete_init(); |
6b6bc620 | 2229 | avc_ss_reset(state->avc, seqno); |
4c443d1b | 2230 | selnl_notify_policyload(seqno); |
aa8e712c | 2231 | selinux_status_update_policyload(state, seqno); |
7420ed23 | 2232 | selinux_netlbl_cache_invalidate(); |
342a0cff | 2233 | selinux_xfrm_notify_policyload(); |
b5495b42 | 2234 | goto out; |
1da177e4 LT |
2235 | } |
2236 | ||
b5495b42 | 2237 | rc = policydb_read(newpolicydb, fp); |
24ed7fda OM |
2238 | if (rc) { |
2239 | kfree(newsidtab); | |
b5495b42 | 2240 | goto out; |
24ed7fda | 2241 | } |
1da177e4 | 2242 | |
b5495b42 | 2243 | newpolicydb->len = len; |
0719aaf5 | 2244 | /* If switching between different policy types, log MLS status */ |
aa8e712c | 2245 | if (policydb->mls_enabled && !newpolicydb->mls_enabled) |
b54c85c1 | 2246 | pr_info("SELinux: Disabling MLS support...\n"); |
aa8e712c | 2247 | else if (!policydb->mls_enabled && newpolicydb->mls_enabled) |
b54c85c1 | 2248 | pr_info("SELinux: Enabling MLS support...\n"); |
0719aaf5 | 2249 | |
24ed7fda | 2250 | rc = policydb_load_isids(newpolicydb, newsidtab); |
42596eaf | 2251 | if (rc) { |
b54c85c1 | 2252 | pr_err("SELinux: unable to load the initial SIDs\n"); |
b5495b42 | 2253 | policydb_destroy(newpolicydb); |
24ed7fda | 2254 | kfree(newsidtab); |
b5495b42 | 2255 | goto out; |
12b29f34 | 2256 | } |
1da177e4 | 2257 | |
aa8e712c | 2258 | rc = selinux_set_mapping(newpolicydb, secclass_map, &newmap); |
a2000050 | 2259 | if (rc) |
b94c7e67 | 2260 | goto err; |
b94c7e67 | 2261 | |
aa8e712c | 2262 | rc = security_preserve_bools(state, newpolicydb); |
e900a7d9 | 2263 | if (rc) { |
b54c85c1 | 2264 | pr_err("SELinux: unable to preserve booleans\n"); |
e900a7d9 SS |
2265 | goto err; |
2266 | } | |
2267 | ||
ee1a84fd OM |
2268 | oldsidtab = state->ss->sidtab; |
2269 | ||
12b29f34 SS |
2270 | /* |
2271 | * Convert the internal representations of contexts | |
2272 | * in the new SID table. | |
2273 | */ | |
aa8e712c SS |
2274 | args.state = state; |
2275 | args.oldp = policydb; | |
b5495b42 | 2276 | args.newp = newpolicydb; |
ee1a84fd OM |
2277 | |
2278 | convert_params.func = convert_context; | |
2279 | convert_params.args = &args; | |
2280 | convert_params.target = newsidtab; | |
2281 | ||
2282 | rc = sidtab_convert(oldsidtab, &convert_params); | |
0719aaf5 | 2283 | if (rc) { |
b54c85c1 | 2284 | pr_err("SELinux: unable to convert the internal" |
0719aaf5 GT |
2285 | " representation of contexts in the new SID" |
2286 | " table\n"); | |
12b29f34 | 2287 | goto err; |
0719aaf5 | 2288 | } |
1da177e4 LT |
2289 | |
2290 | /* Save the old policydb and SID table to free later. */ | |
aa8e712c | 2291 | memcpy(oldpolicydb, policydb, sizeof(*policydb)); |
1da177e4 LT |
2292 | |
2293 | /* Install the new policydb and SID table. */ | |
aa8e712c SS |
2294 | write_lock_irq(&state->ss->policy_rwlock); |
2295 | memcpy(policydb, newpolicydb, sizeof(*policydb)); | |
24ed7fda | 2296 | state->ss->sidtab = newsidtab; |
aa8e712c SS |
2297 | security_load_policycaps(state); |
2298 | oldmapping = state->ss->map.mapping; | |
2299 | state->ss->map.mapping = newmap.mapping; | |
2300 | state->ss->map.size = newmap.size; | |
2301 | seqno = ++state->ss->latest_granting; | |
2302 | write_unlock_irq(&state->ss->policy_rwlock); | |
1da177e4 LT |
2303 | |
2304 | /* Free the old policydb and SID table. */ | |
b5495b42 | 2305 | policydb_destroy(oldpolicydb); |
24ed7fda OM |
2306 | sidtab_destroy(oldsidtab); |
2307 | kfree(oldsidtab); | |
aa8e712c | 2308 | kfree(oldmapping); |
1da177e4 | 2309 | |
6b6bc620 | 2310 | avc_ss_reset(state->avc, seqno); |
1da177e4 | 2311 | selnl_notify_policyload(seqno); |
aa8e712c | 2312 | selinux_status_update_policyload(state, seqno); |
7420ed23 | 2313 | selinux_netlbl_cache_invalidate(); |
342a0cff | 2314 | selinux_xfrm_notify_policyload(); |
1da177e4 | 2315 | |
b5495b42 TG |
2316 | rc = 0; |
2317 | goto out; | |
1da177e4 LT |
2318 | |
2319 | err: | |
aa8e712c | 2320 | kfree(newmap.mapping); |
24ed7fda OM |
2321 | sidtab_destroy(newsidtab); |
2322 | kfree(newsidtab); | |
b5495b42 | 2323 | policydb_destroy(newpolicydb); |
1da177e4 | 2324 | |
b5495b42 TG |
2325 | out: |
2326 | kfree(oldpolicydb); | |
2327 | return rc; | |
1da177e4 LT |
2328 | } |
2329 | ||
aa8e712c | 2330 | size_t security_policydb_len(struct selinux_state *state) |
cee74f47 | 2331 | { |
aa8e712c | 2332 | struct policydb *p = &state->ss->policydb; |
cee74f47 EP |
2333 | size_t len; |
2334 | ||
aa8e712c SS |
2335 | read_lock(&state->ss->policy_rwlock); |
2336 | len = p->len; | |
2337 | read_unlock(&state->ss->policy_rwlock); | |
cee74f47 EP |
2338 | |
2339 | return len; | |
2340 | } | |
2341 | ||
1da177e4 LT |
2342 | /** |
2343 | * security_port_sid - Obtain the SID for a port. | |
1da177e4 LT |
2344 | * @protocol: protocol number |
2345 | * @port: port number | |
2346 | * @out_sid: security identifier | |
2347 | */ | |
aa8e712c SS |
2348 | int security_port_sid(struct selinux_state *state, |
2349 | u8 protocol, u16 port, u32 *out_sid) | |
1da177e4 | 2350 | { |
aa8e712c | 2351 | struct policydb *policydb; |
1da177e4 LT |
2352 | struct ocontext *c; |
2353 | int rc = 0; | |
2354 | ||
aa8e712c SS |
2355 | read_lock(&state->ss->policy_rwlock); |
2356 | ||
2357 | policydb = &state->ss->policydb; | |
1da177e4 | 2358 | |
aa8e712c | 2359 | c = policydb->ocontexts[OCON_PORT]; |
1da177e4 LT |
2360 | while (c) { |
2361 | if (c->u.port.protocol == protocol && | |
2362 | c->u.port.low_port <= port && | |
2363 | c->u.port.high_port >= port) | |
2364 | break; | |
2365 | c = c->next; | |
2366 | } | |
2367 | ||
2368 | if (c) { | |
2369 | if (!c->sid[0]) { | |
66f8e2f0 | 2370 | rc = context_struct_to_sid(state, &c->context[0], |
1da177e4 LT |
2371 | &c->sid[0]); |
2372 | if (rc) | |
2373 | goto out; | |
2374 | } | |
2375 | *out_sid = c->sid[0]; | |
2376 | } else { | |
2377 | *out_sid = SECINITSID_PORT; | |
2378 | } | |
2379 | ||
2380 | out: | |
aa8e712c | 2381 | read_unlock(&state->ss->policy_rwlock); |
1da177e4 LT |
2382 | return rc; |
2383 | } | |
2384 | ||
cfc4d882 DJ |
2385 | /** |
2386 | * security_pkey_sid - Obtain the SID for a pkey. | |
2387 | * @subnet_prefix: Subnet Prefix | |
2388 | * @pkey_num: pkey number | |
2389 | * @out_sid: security identifier | |
2390 | */ | |
aa8e712c SS |
2391 | int security_ib_pkey_sid(struct selinux_state *state, |
2392 | u64 subnet_prefix, u16 pkey_num, u32 *out_sid) | |
cfc4d882 | 2393 | { |
aa8e712c | 2394 | struct policydb *policydb; |
cfc4d882 DJ |
2395 | struct ocontext *c; |
2396 | int rc = 0; | |
2397 | ||
aa8e712c SS |
2398 | read_lock(&state->ss->policy_rwlock); |
2399 | ||
2400 | policydb = &state->ss->policydb; | |
cfc4d882 | 2401 | |
aa8e712c | 2402 | c = policydb->ocontexts[OCON_IBPKEY]; |
cfc4d882 DJ |
2403 | while (c) { |
2404 | if (c->u.ibpkey.low_pkey <= pkey_num && | |
2405 | c->u.ibpkey.high_pkey >= pkey_num && | |
2406 | c->u.ibpkey.subnet_prefix == subnet_prefix) | |
2407 | break; | |
2408 | ||
2409 | c = c->next; | |
2410 | } | |
2411 | ||
2412 | if (c) { | |
2413 | if (!c->sid[0]) { | |
66f8e2f0 | 2414 | rc = context_struct_to_sid(state, |
cfc4d882 DJ |
2415 | &c->context[0], |
2416 | &c->sid[0]); | |
2417 | if (rc) | |
2418 | goto out; | |
2419 | } | |
2420 | *out_sid = c->sid[0]; | |
2421 | } else | |
2422 | *out_sid = SECINITSID_UNLABELED; | |
2423 | ||
2424 | out: | |
aa8e712c | 2425 | read_unlock(&state->ss->policy_rwlock); |
cfc4d882 DJ |
2426 | return rc; |
2427 | } | |
2428 | ||
ab861dfc DJ |
2429 | /** |
2430 | * security_ib_endport_sid - Obtain the SID for a subnet management interface. | |
2431 | * @dev_name: device name | |
2432 | * @port: port number | |
2433 | * @out_sid: security identifier | |
2434 | */ | |
aa8e712c SS |
2435 | int security_ib_endport_sid(struct selinux_state *state, |
2436 | const char *dev_name, u8 port_num, u32 *out_sid) | |
ab861dfc | 2437 | { |
aa8e712c | 2438 | struct policydb *policydb; |
ab861dfc DJ |
2439 | struct ocontext *c; |
2440 | int rc = 0; | |
2441 | ||
aa8e712c | 2442 | read_lock(&state->ss->policy_rwlock); |
ab861dfc | 2443 | |
aa8e712c | 2444 | policydb = &state->ss->policydb; |
aa8e712c SS |
2445 | |
2446 | c = policydb->ocontexts[OCON_IBENDPORT]; | |
ab861dfc DJ |
2447 | while (c) { |
2448 | if (c->u.ibendport.port == port_num && | |
2449 | !strncmp(c->u.ibendport.dev_name, | |
2450 | dev_name, | |
2451 | IB_DEVICE_NAME_MAX)) | |
2452 | break; | |
2453 | ||
2454 | c = c->next; | |
2455 | } | |
2456 | ||
2457 | if (c) { | |
2458 | if (!c->sid[0]) { | |
66f8e2f0 | 2459 | rc = context_struct_to_sid(state, &c->context[0], |
ab861dfc DJ |
2460 | &c->sid[0]); |
2461 | if (rc) | |
2462 | goto out; | |
2463 | } | |
2464 | *out_sid = c->sid[0]; | |
2465 | } else | |
2466 | *out_sid = SECINITSID_UNLABELED; | |
2467 | ||
2468 | out: | |
aa8e712c | 2469 | read_unlock(&state->ss->policy_rwlock); |
ab861dfc DJ |
2470 | return rc; |
2471 | } | |
2472 | ||
1da177e4 LT |
2473 | /** |
2474 | * security_netif_sid - Obtain the SID for a network interface. | |
2475 | * @name: interface name | |
2476 | * @if_sid: interface SID | |
1da177e4 | 2477 | */ |
aa8e712c SS |
2478 | int security_netif_sid(struct selinux_state *state, |
2479 | char *name, u32 *if_sid) | |
1da177e4 | 2480 | { |
aa8e712c | 2481 | struct policydb *policydb; |
1da177e4 LT |
2482 | int rc = 0; |
2483 | struct ocontext *c; | |
2484 | ||
aa8e712c SS |
2485 | read_lock(&state->ss->policy_rwlock); |
2486 | ||
2487 | policydb = &state->ss->policydb; | |
1da177e4 | 2488 | |
aa8e712c | 2489 | c = policydb->ocontexts[OCON_NETIF]; |
1da177e4 LT |
2490 | while (c) { |
2491 | if (strcmp(name, c->u.name) == 0) | |
2492 | break; | |
2493 | c = c->next; | |
2494 | } | |
2495 | ||
2496 | if (c) { | |
2497 | if (!c->sid[0] || !c->sid[1]) { | |
66f8e2f0 JVS |
2498 | rc = context_struct_to_sid(state, &c->context[0], |
2499 | &c->sid[0]); | |
1da177e4 LT |
2500 | if (rc) |
2501 | goto out; | |
66f8e2f0 | 2502 | rc = context_struct_to_sid(state, &c->context[1], |
1da177e4 LT |
2503 | &c->sid[1]); |
2504 | if (rc) | |
2505 | goto out; | |
2506 | } | |
2507 | *if_sid = c->sid[0]; | |
e8bfdb9d | 2508 | } else |
1da177e4 | 2509 | *if_sid = SECINITSID_NETIF; |
1da177e4 LT |
2510 | |
2511 | out: | |
aa8e712c | 2512 | read_unlock(&state->ss->policy_rwlock); |
1da177e4 LT |
2513 | return rc; |
2514 | } | |
2515 | ||
2516 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) | |
2517 | { | |
2518 | int i, fail = 0; | |
2519 | ||
5d55a345 EP |
2520 | for (i = 0; i < 4; i++) |
2521 | if (addr[i] != (input[i] & mask[i])) { | |
1da177e4 LT |
2522 | fail = 1; |
2523 | break; | |
2524 | } | |
2525 | ||
2526 | return !fail; | |
2527 | } | |
2528 | ||
2529 | /** | |
2530 | * security_node_sid - Obtain the SID for a node (host). | |
2531 | * @domain: communication domain aka address family | |
2532 | * @addrp: address | |
2533 | * @addrlen: address length in bytes | |
2534 | * @out_sid: security identifier | |
2535 | */ | |
aa8e712c SS |
2536 | int security_node_sid(struct selinux_state *state, |
2537 | u16 domain, | |
1da177e4 LT |
2538 | void *addrp, |
2539 | u32 addrlen, | |
2540 | u32 *out_sid) | |
2541 | { | |
aa8e712c | 2542 | struct policydb *policydb; |
4b02b524 | 2543 | int rc; |
1da177e4 LT |
2544 | struct ocontext *c; |
2545 | ||
aa8e712c SS |
2546 | read_lock(&state->ss->policy_rwlock); |
2547 | ||
2548 | policydb = &state->ss->policydb; | |
1da177e4 LT |
2549 | |
2550 | switch (domain) { | |
2551 | case AF_INET: { | |
2552 | u32 addr; | |
2553 | ||
4b02b524 EP |
2554 | rc = -EINVAL; |
2555 | if (addrlen != sizeof(u32)) | |
1da177e4 | 2556 | goto out; |
1da177e4 LT |
2557 | |
2558 | addr = *((u32 *)addrp); | |
2559 | ||
aa8e712c | 2560 | c = policydb->ocontexts[OCON_NODE]; |
1da177e4 LT |
2561 | while (c) { |
2562 | if (c->u.node.addr == (addr & c->u.node.mask)) | |
2563 | break; | |
2564 | c = c->next; | |
2565 | } | |
2566 | break; | |
2567 | } | |
2568 | ||
2569 | case AF_INET6: | |
4b02b524 EP |
2570 | rc = -EINVAL; |
2571 | if (addrlen != sizeof(u64) * 2) | |
1da177e4 | 2572 | goto out; |
aa8e712c | 2573 | c = policydb->ocontexts[OCON_NODE6]; |
1da177e4 LT |
2574 | while (c) { |
2575 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, | |
2576 | c->u.node6.mask)) | |
2577 | break; | |
2578 | c = c->next; | |
2579 | } | |
2580 | break; | |
2581 | ||
2582 | default: | |
4b02b524 | 2583 | rc = 0; |
1da177e4 LT |
2584 | *out_sid = SECINITSID_NODE; |
2585 | goto out; | |
2586 | } | |
2587 | ||
2588 | if (c) { | |
2589 | if (!c->sid[0]) { | |
66f8e2f0 | 2590 | rc = context_struct_to_sid(state, |
1da177e4 LT |
2591 | &c->context[0], |
2592 | &c->sid[0]); | |
2593 | if (rc) | |
2594 | goto out; | |
2595 | } | |
2596 | *out_sid = c->sid[0]; | |
2597 | } else { | |
2598 | *out_sid = SECINITSID_NODE; | |
2599 | } | |
2600 | ||
4b02b524 | 2601 | rc = 0; |
1da177e4 | 2602 | out: |
aa8e712c | 2603 | read_unlock(&state->ss->policy_rwlock); |
1da177e4 LT |
2604 | return rc; |
2605 | } | |
2606 | ||
2607 | #define SIDS_NEL 25 | |
2608 | ||
2609 | /** | |
2610 | * security_get_user_sids - Obtain reachable SIDs for a user. | |
2611 | * @fromsid: starting SID | |
2612 | * @username: username | |
2613 | * @sids: array of reachable SIDs for user | |
2614 | * @nel: number of elements in @sids | |
2615 | * | |
2616 | * Generate the set of SIDs for legal security contexts | |
2617 | * for a given user that can be reached by @fromsid. | |
2618 | * Set *@sids to point to a dynamically allocated | |
2619 | * array containing the set of SIDs. Set *@nel to the | |
2620 | * number of elements in the array. | |
2621 | */ | |
2622 | ||
aa8e712c SS |
2623 | int security_get_user_sids(struct selinux_state *state, |
2624 | u32 fromsid, | |
5d55a345 | 2625 | char *username, |
1da177e4 LT |
2626 | u32 **sids, |
2627 | u32 *nel) | |
2628 | { | |
aa8e712c SS |
2629 | struct policydb *policydb; |
2630 | struct sidtab *sidtab; | |
1da177e4 | 2631 | struct context *fromcon, usercon; |
2c3c05db | 2632 | u32 *mysids = NULL, *mysids2, sid; |
1da177e4 LT |
2633 | u32 mynel = 0, maxnel = SIDS_NEL; |
2634 | struct user_datum *user; | |
2635 | struct role_datum *role; | |
782ebb99 | 2636 | struct ebitmap_node *rnode, *tnode; |
1da177e4 LT |
2637 | int rc = 0, i, j; |
2638 | ||
2c3c05db SS |
2639 | *sids = NULL; |
2640 | *nel = 0; | |
2641 | ||
65cddd50 | 2642 | if (!selinux_initialized(state)) |
1da177e4 | 2643 | goto out; |
1da177e4 | 2644 | |
aa8e712c SS |
2645 | read_lock(&state->ss->policy_rwlock); |
2646 | ||
2647 | policydb = &state->ss->policydb; | |
24ed7fda | 2648 | sidtab = state->ss->sidtab; |
1da177e4 | 2649 | |
12b29f34 SS |
2650 | context_init(&usercon); |
2651 | ||
4b02b524 | 2652 | rc = -EINVAL; |
aa8e712c | 2653 | fromcon = sidtab_search(sidtab, fromsid); |
4b02b524 | 2654 | if (!fromcon) |
1da177e4 | 2655 | goto out_unlock; |
1da177e4 | 2656 | |
4b02b524 | 2657 | rc = -EINVAL; |
aa8e712c | 2658 | user = hashtab_search(policydb->p_users.table, username); |
4b02b524 | 2659 | if (!user) |
1da177e4 | 2660 | goto out_unlock; |
4b02b524 | 2661 | |
1da177e4 LT |
2662 | usercon.user = user->value; |
2663 | ||
4b02b524 | 2664 | rc = -ENOMEM; |
89d155ef | 2665 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
4b02b524 | 2666 | if (!mysids) |
1da177e4 | 2667 | goto out_unlock; |
1da177e4 | 2668 | |
9fe79ad1 | 2669 | ebitmap_for_each_positive_bit(&user->roles, rnode, i) { |
aa8e712c | 2670 | role = policydb->role_val_to_struct[i]; |
c1a7368a | 2671 | usercon.role = i + 1; |
9fe79ad1 | 2672 | ebitmap_for_each_positive_bit(&role->types, tnode, j) { |
c1a7368a | 2673 | usercon.type = j + 1; |
66f8e2f0 JVS |
2674 | /* |
2675 | * The same context struct is reused here so the hash | |
2676 | * must be reset. | |
2677 | */ | |
2678 | usercon.hash = 0; | |
1da177e4 | 2679 | |
aa8e712c SS |
2680 | if (mls_setup_user_range(policydb, fromcon, user, |
2681 | &usercon)) | |
1da177e4 LT |
2682 | continue; |
2683 | ||
66f8e2f0 | 2684 | rc = context_struct_to_sid(state, &usercon, &sid); |
2c3c05db | 2685 | if (rc) |
1da177e4 | 2686 | goto out_unlock; |
1da177e4 LT |
2687 | if (mynel < maxnel) { |
2688 | mysids[mynel++] = sid; | |
2689 | } else { | |
4b02b524 | 2690 | rc = -ENOMEM; |
1da177e4 | 2691 | maxnel += SIDS_NEL; |
89d155ef | 2692 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
4b02b524 | 2693 | if (!mysids2) |
1da177e4 | 2694 | goto out_unlock; |
1da177e4 LT |
2695 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
2696 | kfree(mysids); | |
2697 | mysids = mysids2; | |
2698 | mysids[mynel++] = sid; | |
2699 | } | |
2700 | } | |
2701 | } | |
4b02b524 | 2702 | rc = 0; |
1da177e4 | 2703 | out_unlock: |
aa8e712c | 2704 | read_unlock(&state->ss->policy_rwlock); |
2c3c05db SS |
2705 | if (rc || !mynel) { |
2706 | kfree(mysids); | |
2707 | goto out; | |
2708 | } | |
2709 | ||
4b02b524 | 2710 | rc = -ENOMEM; |
2c3c05db SS |
2711 | mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); |
2712 | if (!mysids2) { | |
2c3c05db SS |
2713 | kfree(mysids); |
2714 | goto out; | |
2715 | } | |
2716 | for (i = 0, j = 0; i < mynel; i++) { | |
f01e1af4 | 2717 | struct av_decision dummy_avd; |
6b6bc620 SS |
2718 | rc = avc_has_perm_noaudit(state, |
2719 | fromsid, mysids[i], | |
c6d3aaa4 | 2720 | SECCLASS_PROCESS, /* kernel value */ |
2c3c05db | 2721 | PROCESS__TRANSITION, AVC_STRICT, |
f01e1af4 | 2722 | &dummy_avd); |
2c3c05db SS |
2723 | if (!rc) |
2724 | mysids2[j++] = mysids[i]; | |
2725 | cond_resched(); | |
2726 | } | |
2727 | rc = 0; | |
2728 | kfree(mysids); | |
2729 | *sids = mysids2; | |
2730 | *nel = j; | |
1da177e4 LT |
2731 | out: |
2732 | return rc; | |
2733 | } | |
2734 | ||
2735 | /** | |
f31e7994 | 2736 | * __security_genfs_sid - Helper to obtain a SID for a file in a filesystem |
1da177e4 LT |
2737 | * @fstype: filesystem type |
2738 | * @path: path from root of mount | |
2739 | * @sclass: file security class | |
2740 | * @sid: SID for path | |
2741 | * | |
2742 | * Obtain a SID to use for a file in a filesystem that | |
2743 | * cannot support xattr or use a fixed labeling behavior like | |
2744 | * transition SIDs or task SIDs. | |
f31e7994 WL |
2745 | * |
2746 | * The caller must acquire the policy_rwlock before calling this function. | |
1da177e4 | 2747 | */ |
aa8e712c SS |
2748 | static inline int __security_genfs_sid(struct selinux_state *state, |
2749 | const char *fstype, | |
f31e7994 WL |
2750 | char *path, |
2751 | u16 orig_sclass, | |
2752 | u32 *sid) | |
1da177e4 | 2753 | { |
aa8e712c | 2754 | struct policydb *policydb = &state->ss->policydb; |
1da177e4 | 2755 | int len; |
c6d3aaa4 | 2756 | u16 sclass; |
1da177e4 LT |
2757 | struct genfs *genfs; |
2758 | struct ocontext *c; | |
4b02b524 | 2759 | int rc, cmp = 0; |
1da177e4 | 2760 | |
b1aa5301 SS |
2761 | while (path[0] == '/' && path[1] == '/') |
2762 | path++; | |
2763 | ||
aa8e712c | 2764 | sclass = unmap_class(&state->ss->map, orig_sclass); |
4b02b524 | 2765 | *sid = SECINITSID_UNLABELED; |
c6d3aaa4 | 2766 | |
aa8e712c | 2767 | for (genfs = policydb->genfs; genfs; genfs = genfs->next) { |
1da177e4 LT |
2768 | cmp = strcmp(fstype, genfs->fstype); |
2769 | if (cmp <= 0) | |
2770 | break; | |
2771 | } | |
2772 | ||
4b02b524 EP |
2773 | rc = -ENOENT; |
2774 | if (!genfs || cmp) | |
1da177e4 | 2775 | goto out; |
1da177e4 LT |
2776 | |
2777 | for (c = genfs->head; c; c = c->next) { | |
2778 | len = strlen(c->u.name); | |
2779 | if ((!c->v.sclass || sclass == c->v.sclass) && | |
2780 | (strncmp(c->u.name, path, len) == 0)) | |
2781 | break; | |
2782 | } | |
2783 | ||
4b02b524 EP |
2784 | rc = -ENOENT; |
2785 | if (!c) | |
1da177e4 | 2786 | goto out; |
1da177e4 LT |
2787 | |
2788 | if (!c->sid[0]) { | |
66f8e2f0 | 2789 | rc = context_struct_to_sid(state, &c->context[0], &c->sid[0]); |
1da177e4 LT |
2790 | if (rc) |
2791 | goto out; | |
2792 | } | |
2793 | ||
2794 | *sid = c->sid[0]; | |
4b02b524 | 2795 | rc = 0; |
1da177e4 | 2796 | out: |
1da177e4 LT |
2797 | return rc; |
2798 | } | |
2799 | ||
f31e7994 WL |
2800 | /** |
2801 | * security_genfs_sid - Obtain a SID for a file in a filesystem | |
2802 | * @fstype: filesystem type | |
2803 | * @path: path from root of mount | |
2804 | * @sclass: file security class | |
2805 | * @sid: SID for path | |
2806 | * | |
2807 | * Acquire policy_rwlock before calling __security_genfs_sid() and release | |
2808 | * it afterward. | |
2809 | */ | |
aa8e712c SS |
2810 | int security_genfs_sid(struct selinux_state *state, |
2811 | const char *fstype, | |
f31e7994 WL |
2812 | char *path, |
2813 | u16 orig_sclass, | |
2814 | u32 *sid) | |
2815 | { | |
2816 | int retval; | |
2817 | ||
aa8e712c SS |
2818 | read_lock(&state->ss->policy_rwlock); |
2819 | retval = __security_genfs_sid(state, fstype, path, orig_sclass, sid); | |
2820 | read_unlock(&state->ss->policy_rwlock); | |
f31e7994 WL |
2821 | return retval; |
2822 | } | |
2823 | ||
1da177e4 LT |
2824 | /** |
2825 | * security_fs_use - Determine how to handle labeling for a filesystem. | |
a64c54cf | 2826 | * @sb: superblock in question |
1da177e4 | 2827 | */ |
aa8e712c | 2828 | int security_fs_use(struct selinux_state *state, struct super_block *sb) |
1da177e4 | 2829 | { |
aa8e712c | 2830 | struct policydb *policydb; |
1da177e4 LT |
2831 | int rc = 0; |
2832 | struct ocontext *c; | |
a64c54cf EP |
2833 | struct superblock_security_struct *sbsec = sb->s_security; |
2834 | const char *fstype = sb->s_type->name; | |
1da177e4 | 2835 | |
aa8e712c SS |
2836 | read_lock(&state->ss->policy_rwlock); |
2837 | ||
2838 | policydb = &state->ss->policydb; | |
1da177e4 | 2839 | |
aa8e712c | 2840 | c = policydb->ocontexts[OCON_FSUSE]; |
4d546f81 PM |
2841 | while (c) { |
2842 | if (strcmp(fstype, c->u.name) == 0) | |
1da177e4 | 2843 | break; |
4d546f81 | 2844 | c = c->next; |
1da177e4 LT |
2845 | } |
2846 | ||
2847 | if (c) { | |
a64c54cf | 2848 | sbsec->behavior = c->v.behavior; |
1da177e4 | 2849 | if (!c->sid[0]) { |
66f8e2f0 | 2850 | rc = context_struct_to_sid(state, &c->context[0], |
1da177e4 LT |
2851 | &c->sid[0]); |
2852 | if (rc) | |
2853 | goto out; | |
2854 | } | |
a64c54cf | 2855 | sbsec->sid = c->sid[0]; |
1da177e4 | 2856 | } else { |
aa8e712c | 2857 | rc = __security_genfs_sid(state, fstype, "/", SECCLASS_DIR, |
f31e7994 | 2858 | &sbsec->sid); |
089be43e | 2859 | if (rc) { |
a64c54cf | 2860 | sbsec->behavior = SECURITY_FS_USE_NONE; |
089be43e JM |
2861 | rc = 0; |
2862 | } else { | |
a64c54cf | 2863 | sbsec->behavior = SECURITY_FS_USE_GENFS; |
089be43e | 2864 | } |
1da177e4 LT |
2865 | } |
2866 | ||
2867 | out: | |
aa8e712c | 2868 | read_unlock(&state->ss->policy_rwlock); |
1da177e4 LT |
2869 | return rc; |
2870 | } | |
2871 | ||
aa8e712c SS |
2872 | int security_get_bools(struct selinux_state *state, |
2873 | int *len, char ***names, int **values) | |
1da177e4 | 2874 | { |
aa8e712c | 2875 | struct policydb *policydb; |
4b02b524 | 2876 | int i, rc; |
1da177e4 | 2877 | |
65cddd50 | 2878 | if (!selinux_initialized(state)) { |
274f62e1 SS |
2879 | *len = 0; |
2880 | *names = NULL; | |
2881 | *values = NULL; | |
2882 | return 0; | |
2883 | } | |
2884 | ||
aa8e712c SS |
2885 | read_lock(&state->ss->policy_rwlock); |
2886 | ||
2887 | policydb = &state->ss->policydb; | |
2888 | ||
1da177e4 LT |
2889 | *names = NULL; |
2890 | *values = NULL; | |
2891 | ||
4b02b524 | 2892 | rc = 0; |
aa8e712c | 2893 | *len = policydb->p_bools.nprim; |
4b02b524 | 2894 | if (!*len) |
1da177e4 | 2895 | goto out; |
1da177e4 | 2896 | |
4b02b524 EP |
2897 | rc = -ENOMEM; |
2898 | *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); | |
1da177e4 LT |
2899 | if (!*names) |
2900 | goto err; | |
1da177e4 | 2901 | |
4b02b524 EP |
2902 | rc = -ENOMEM; |
2903 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); | |
1da177e4 LT |
2904 | if (!*values) |
2905 | goto err; | |
2906 | ||
2907 | for (i = 0; i < *len; i++) { | |
aa8e712c | 2908 | (*values)[i] = policydb->bool_val_to_struct[i]->state; |
4b02b524 EP |
2909 | |
2910 | rc = -ENOMEM; | |
aa8e712c SS |
2911 | (*names)[i] = kstrdup(sym_name(policydb, SYM_BOOLS, i), |
2912 | GFP_ATOMIC); | |
1da177e4 LT |
2913 | if (!(*names)[i]) |
2914 | goto err; | |
1da177e4 LT |
2915 | } |
2916 | rc = 0; | |
2917 | out: | |
aa8e712c | 2918 | read_unlock(&state->ss->policy_rwlock); |
1da177e4 LT |
2919 | return rc; |
2920 | err: | |
2921 | if (*names) { | |
2922 | for (i = 0; i < *len; i++) | |
9a5f04bf | 2923 | kfree((*names)[i]); |
1da177e4 | 2924 | } |
9a5f04bf | 2925 | kfree(*values); |
1da177e4 LT |
2926 | goto out; |
2927 | } | |
2928 | ||
2929 | ||
aa8e712c | 2930 | int security_set_bools(struct selinux_state *state, int len, int *values) |
1da177e4 | 2931 | { |
aa8e712c | 2932 | struct policydb *policydb; |
4b02b524 | 2933 | int i, rc; |
1da177e4 LT |
2934 | int lenp, seqno = 0; |
2935 | struct cond_node *cur; | |
2936 | ||
aa8e712c SS |
2937 | write_lock_irq(&state->ss->policy_rwlock); |
2938 | ||
2939 | policydb = &state->ss->policydb; | |
1da177e4 | 2940 | |
4b02b524 | 2941 | rc = -EFAULT; |
aa8e712c | 2942 | lenp = policydb->p_bools.nprim; |
4b02b524 | 2943 | if (len != lenp) |
1da177e4 | 2944 | goto out; |
1da177e4 | 2945 | |
1da177e4 | 2946 | for (i = 0; i < len; i++) { |
aa8e712c | 2947 | if (!!values[i] != policydb->bool_val_to_struct[i]->state) { |
cdfb6b34 | 2948 | audit_log(audit_context(), GFP_ATOMIC, |
af601e46 | 2949 | AUDIT_MAC_CONFIG_CHANGE, |
4746ec5b | 2950 | "bool=%s val=%d old_val=%d auid=%u ses=%u", |
aa8e712c | 2951 | sym_name(policydb, SYM_BOOLS, i), |
af601e46 | 2952 | !!values[i], |
aa8e712c | 2953 | policydb->bool_val_to_struct[i]->state, |
581abc09 | 2954 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 2955 | audit_get_sessionid(current)); |
af601e46 | 2956 | } |
5d55a345 | 2957 | if (values[i]) |
aa8e712c | 2958 | policydb->bool_val_to_struct[i]->state = 1; |
5d55a345 | 2959 | else |
aa8e712c | 2960 | policydb->bool_val_to_struct[i]->state = 0; |
1da177e4 | 2961 | } |
1da177e4 | 2962 | |
aa8e712c SS |
2963 | for (cur = policydb->cond_list; cur; cur = cur->next) { |
2964 | rc = evaluate_cond_node(policydb, cur); | |
1da177e4 LT |
2965 | if (rc) |
2966 | goto out; | |
2967 | } | |
2968 | ||
aa8e712c | 2969 | seqno = ++state->ss->latest_granting; |
4b02b524 | 2970 | rc = 0; |
1da177e4 | 2971 | out: |
aa8e712c | 2972 | write_unlock_irq(&state->ss->policy_rwlock); |
1da177e4 | 2973 | if (!rc) { |
6b6bc620 | 2974 | avc_ss_reset(state->avc, seqno); |
1da177e4 | 2975 | selnl_notify_policyload(seqno); |
aa8e712c | 2976 | selinux_status_update_policyload(state, seqno); |
342a0cff | 2977 | selinux_xfrm_notify_policyload(); |
1da177e4 LT |
2978 | } |
2979 | return rc; | |
2980 | } | |
2981 | ||
aa8e712c SS |
2982 | int security_get_bool_value(struct selinux_state *state, |
2983 | int index) | |
1da177e4 | 2984 | { |
aa8e712c | 2985 | struct policydb *policydb; |
4b02b524 | 2986 | int rc; |
1da177e4 LT |
2987 | int len; |
2988 | ||
aa8e712c SS |
2989 | read_lock(&state->ss->policy_rwlock); |
2990 | ||
2991 | policydb = &state->ss->policydb; | |
1da177e4 | 2992 | |
4b02b524 | 2993 | rc = -EFAULT; |
aa8e712c | 2994 | len = policydb->p_bools.nprim; |
0fd71a62 | 2995 | if (index >= len) |
1da177e4 | 2996 | goto out; |
1da177e4 | 2997 | |
aa8e712c | 2998 | rc = policydb->bool_val_to_struct[index]->state; |
1da177e4 | 2999 | out: |
aa8e712c | 3000 | read_unlock(&state->ss->policy_rwlock); |
1da177e4 LT |
3001 | return rc; |
3002 | } | |
376bd9cb | 3003 | |
aa8e712c SS |
3004 | static int security_preserve_bools(struct selinux_state *state, |
3005 | struct policydb *policydb) | |
e900a7d9 SS |
3006 | { |
3007 | int rc, nbools = 0, *bvalues = NULL, i; | |
3008 | char **bnames = NULL; | |
3009 | struct cond_bool_datum *booldatum; | |
3010 | struct cond_node *cur; | |
3011 | ||
aa8e712c | 3012 | rc = security_get_bools(state, &nbools, &bnames, &bvalues); |
e900a7d9 SS |
3013 | if (rc) |
3014 | goto out; | |
3015 | for (i = 0; i < nbools; i++) { | |
aa8e712c | 3016 | booldatum = hashtab_search(policydb->p_bools.table, bnames[i]); |
e900a7d9 SS |
3017 | if (booldatum) |
3018 | booldatum->state = bvalues[i]; | |
3019 | } | |
aa8e712c SS |
3020 | for (cur = policydb->cond_list; cur; cur = cur->next) { |
3021 | rc = evaluate_cond_node(policydb, cur); | |
e900a7d9 SS |
3022 | if (rc) |
3023 | goto out; | |
3024 | } | |
3025 | ||
3026 | out: | |
3027 | if (bnames) { | |
3028 | for (i = 0; i < nbools; i++) | |
3029 | kfree(bnames[i]); | |
3030 | } | |
3031 | kfree(bnames); | |
3032 | kfree(bvalues); | |
3033 | return rc; | |
3034 | } | |
3035 | ||
08554d6b VY |
3036 | /* |
3037 | * security_sid_mls_copy() - computes a new sid based on the given | |
3038 | * sid and the mls portion of mls_sid. | |
3039 | */ | |
aa8e712c SS |
3040 | int security_sid_mls_copy(struct selinux_state *state, |
3041 | u32 sid, u32 mls_sid, u32 *new_sid) | |
08554d6b | 3042 | { |
aa8e712c | 3043 | struct policydb *policydb = &state->ss->policydb; |
24ed7fda | 3044 | struct sidtab *sidtab = state->ss->sidtab; |
08554d6b VY |
3045 | struct context *context1; |
3046 | struct context *context2; | |
3047 | struct context newcon; | |
3048 | char *s; | |
3049 | u32 len; | |
4b02b524 | 3050 | int rc; |
08554d6b | 3051 | |
4b02b524 | 3052 | rc = 0; |
65cddd50 | 3053 | if (!selinux_initialized(state) || !policydb->mls_enabled) { |
08554d6b VY |
3054 | *new_sid = sid; |
3055 | goto out; | |
3056 | } | |
3057 | ||
3058 | context_init(&newcon); | |
3059 | ||
aa8e712c | 3060 | read_lock(&state->ss->policy_rwlock); |
4b02b524 EP |
3061 | |
3062 | rc = -EINVAL; | |
aa8e712c | 3063 | context1 = sidtab_search(sidtab, sid); |
08554d6b | 3064 | if (!context1) { |
b54c85c1 | 3065 | pr_err("SELinux: %s: unrecognized SID %d\n", |
744ba35e | 3066 | __func__, sid); |
08554d6b VY |
3067 | goto out_unlock; |
3068 | } | |
3069 | ||
4b02b524 | 3070 | rc = -EINVAL; |
aa8e712c | 3071 | context2 = sidtab_search(sidtab, mls_sid); |
08554d6b | 3072 | if (!context2) { |
b54c85c1 | 3073 | pr_err("SELinux: %s: unrecognized SID %d\n", |
744ba35e | 3074 | __func__, mls_sid); |
08554d6b VY |
3075 | goto out_unlock; |
3076 | } | |
3077 | ||
3078 | newcon.user = context1->user; | |
3079 | newcon.role = context1->role; | |
3080 | newcon.type = context1->type; | |
0efc61ea | 3081 | rc = mls_context_cpy(&newcon, context2); |
08554d6b VY |
3082 | if (rc) |
3083 | goto out_unlock; | |
3084 | ||
08554d6b | 3085 | /* Check the validity of the new context. */ |
aa8e712c SS |
3086 | if (!policydb_context_isvalid(policydb, &newcon)) { |
3087 | rc = convert_context_handle_invalid_context(state, &newcon); | |
4b02b524 | 3088 | if (rc) { |
aa8e712c SS |
3089 | if (!context_struct_to_string(policydb, &newcon, &s, |
3090 | &len)) { | |
ea74a685 RGB |
3091 | struct audit_buffer *ab; |
3092 | ||
3093 | ab = audit_log_start(audit_context(), | |
3094 | GFP_ATOMIC, | |
3095 | AUDIT_SELINUX_ERR); | |
3096 | audit_log_format(ab, | |
3097 | "op=security_sid_mls_copy invalid_context="); | |
3098 | /* don't record NUL with untrusted strings */ | |
3099 | audit_log_n_untrustedstring(ab, s, len - 1); | |
3100 | audit_log_end(ab); | |
4b02b524 EP |
3101 | kfree(s); |
3102 | } | |
3103 | goto out_unlock; | |
3104 | } | |
08554d6b | 3105 | } |
66f8e2f0 | 3106 | rc = context_struct_to_sid(state, &newcon, new_sid); |
08554d6b | 3107 | out_unlock: |
aa8e712c | 3108 | read_unlock(&state->ss->policy_rwlock); |
08554d6b VY |
3109 | context_destroy(&newcon); |
3110 | out: | |
3111 | return rc; | |
3112 | } | |
3113 | ||
220deb96 PM |
3114 | /** |
3115 | * security_net_peersid_resolve - Compare and resolve two network peer SIDs | |
3116 | * @nlbl_sid: NetLabel SID | |
3117 | * @nlbl_type: NetLabel labeling protocol type | |
3118 | * @xfrm_sid: XFRM SID | |
3119 | * | |
3120 | * Description: | |
3121 | * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be | |
3122 | * resolved into a single SID it is returned via @peer_sid and the function | |
3123 | * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function | |
3124 | * returns a negative value. A table summarizing the behavior is below: | |
3125 | * | |
3126 | * | function return | @sid | |
3127 | * ------------------------------+-----------------+----------------- | |
3128 | * no peer labels | 0 | SECSID_NULL | |
3129 | * single peer label | 0 | <peer_label> | |
3130 | * multiple, consistent labels | 0 | <peer_label> | |
3131 | * multiple, inconsistent labels | -<errno> | SECSID_NULL | |
3132 | * | |
3133 | */ | |
aa8e712c SS |
3134 | int security_net_peersid_resolve(struct selinux_state *state, |
3135 | u32 nlbl_sid, u32 nlbl_type, | |
220deb96 PM |
3136 | u32 xfrm_sid, |
3137 | u32 *peer_sid) | |
3138 | { | |
aa8e712c | 3139 | struct policydb *policydb = &state->ss->policydb; |
24ed7fda | 3140 | struct sidtab *sidtab = state->ss->sidtab; |
220deb96 PM |
3141 | int rc; |
3142 | struct context *nlbl_ctx; | |
3143 | struct context *xfrm_ctx; | |
3144 | ||
4b02b524 EP |
3145 | *peer_sid = SECSID_NULL; |
3146 | ||
220deb96 PM |
3147 | /* handle the common (which also happens to be the set of easy) cases |
3148 | * right away, these two if statements catch everything involving a | |
3149 | * single or absent peer SID/label */ | |
3150 | if (xfrm_sid == SECSID_NULL) { | |
3151 | *peer_sid = nlbl_sid; | |
3152 | return 0; | |
3153 | } | |
3154 | /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label | |
3155 | * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label | |
3156 | * is present */ | |
3157 | if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { | |
3158 | *peer_sid = xfrm_sid; | |
3159 | return 0; | |
3160 | } | |
3161 | ||
aa8e712c SS |
3162 | /* |
3163 | * We don't need to check initialized here since the only way both | |
220deb96 | 3164 | * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the |
aa8e712c SS |
3165 | * security server was initialized and state->initialized was true. |
3166 | */ | |
3167 | if (!policydb->mls_enabled) | |
220deb96 | 3168 | return 0; |
220deb96 | 3169 | |
aa8e712c | 3170 | read_lock(&state->ss->policy_rwlock); |
220deb96 | 3171 | |
4b02b524 | 3172 | rc = -EINVAL; |
aa8e712c | 3173 | nlbl_ctx = sidtab_search(sidtab, nlbl_sid); |
220deb96 | 3174 | if (!nlbl_ctx) { |
b54c85c1 | 3175 | pr_err("SELinux: %s: unrecognized SID %d\n", |
744ba35e | 3176 | __func__, nlbl_sid); |
4b02b524 | 3177 | goto out; |
220deb96 | 3178 | } |
4b02b524 | 3179 | rc = -EINVAL; |
aa8e712c | 3180 | xfrm_ctx = sidtab_search(sidtab, xfrm_sid); |
220deb96 | 3181 | if (!xfrm_ctx) { |
b54c85c1 | 3182 | pr_err("SELinux: %s: unrecognized SID %d\n", |
744ba35e | 3183 | __func__, xfrm_sid); |
4b02b524 | 3184 | goto out; |
220deb96 PM |
3185 | } |
3186 | rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); | |
4b02b524 EP |
3187 | if (rc) |
3188 | goto out; | |
220deb96 | 3189 | |
4b02b524 EP |
3190 | /* at present NetLabel SIDs/labels really only carry MLS |
3191 | * information so if the MLS portion of the NetLabel SID | |
3192 | * matches the MLS portion of the labeled XFRM SID/label | |
3193 | * then pass along the XFRM SID as it is the most | |
3194 | * expressive */ | |
3195 | *peer_sid = xfrm_sid; | |
3196 | out: | |
aa8e712c | 3197 | read_unlock(&state->ss->policy_rwlock); |
220deb96 PM |
3198 | return rc; |
3199 | } | |
3200 | ||
55fcf09b CP |
3201 | static int get_classes_callback(void *k, void *d, void *args) |
3202 | { | |
3203 | struct class_datum *datum = d; | |
3204 | char *name = k, **classes = args; | |
3205 | int value = datum->value - 1; | |
3206 | ||
3207 | classes[value] = kstrdup(name, GFP_ATOMIC); | |
3208 | if (!classes[value]) | |
3209 | return -ENOMEM; | |
3210 | ||
3211 | return 0; | |
3212 | } | |
3213 | ||
aa8e712c SS |
3214 | int security_get_classes(struct selinux_state *state, |
3215 | char ***classes, int *nclasses) | |
55fcf09b | 3216 | { |
aa8e712c | 3217 | struct policydb *policydb = &state->ss->policydb; |
4b02b524 | 3218 | int rc; |
55fcf09b | 3219 | |
65cddd50 | 3220 | if (!selinux_initialized(state)) { |
274f62e1 SS |
3221 | *nclasses = 0; |
3222 | *classes = NULL; | |
3223 | return 0; | |
3224 | } | |
3225 | ||
aa8e712c | 3226 | read_lock(&state->ss->policy_rwlock); |
55fcf09b | 3227 | |
4b02b524 | 3228 | rc = -ENOMEM; |
aa8e712c | 3229 | *nclasses = policydb->p_classes.nprim; |
9f59f90b | 3230 | *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC); |
55fcf09b CP |
3231 | if (!*classes) |
3232 | goto out; | |
3233 | ||
aa8e712c | 3234 | rc = hashtab_map(policydb->p_classes.table, get_classes_callback, |
55fcf09b | 3235 | *classes); |
4b02b524 | 3236 | if (rc) { |
55fcf09b CP |
3237 | int i; |
3238 | for (i = 0; i < *nclasses; i++) | |
3239 | kfree((*classes)[i]); | |
3240 | kfree(*classes); | |
3241 | } | |
3242 | ||
3243 | out: | |
aa8e712c | 3244 | read_unlock(&state->ss->policy_rwlock); |
55fcf09b CP |
3245 | return rc; |
3246 | } | |
3247 | ||
3248 | static int get_permissions_callback(void *k, void *d, void *args) | |
3249 | { | |
3250 | struct perm_datum *datum = d; | |
3251 | char *name = k, **perms = args; | |
3252 | int value = datum->value - 1; | |
3253 | ||
3254 | perms[value] = kstrdup(name, GFP_ATOMIC); | |
3255 | if (!perms[value]) | |
3256 | return -ENOMEM; | |
3257 | ||
3258 | return 0; | |
3259 | } | |
3260 | ||
aa8e712c SS |
3261 | int security_get_permissions(struct selinux_state *state, |
3262 | char *class, char ***perms, int *nperms) | |
55fcf09b | 3263 | { |
aa8e712c | 3264 | struct policydb *policydb = &state->ss->policydb; |
4b02b524 | 3265 | int rc, i; |
55fcf09b CP |
3266 | struct class_datum *match; |
3267 | ||
aa8e712c | 3268 | read_lock(&state->ss->policy_rwlock); |
55fcf09b | 3269 | |
4b02b524 | 3270 | rc = -EINVAL; |
aa8e712c | 3271 | match = hashtab_search(policydb->p_classes.table, class); |
55fcf09b | 3272 | if (!match) { |
b54c85c1 | 3273 | pr_err("SELinux: %s: unrecognized class %s\n", |
dd6f953a | 3274 | __func__, class); |
55fcf09b CP |
3275 | goto out; |
3276 | } | |
3277 | ||
4b02b524 | 3278 | rc = -ENOMEM; |
55fcf09b | 3279 | *nperms = match->permissions.nprim; |
9f59f90b | 3280 | *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC); |
55fcf09b CP |
3281 | if (!*perms) |
3282 | goto out; | |
3283 | ||
3284 | if (match->comdatum) { | |
3285 | rc = hashtab_map(match->comdatum->permissions.table, | |
3286 | get_permissions_callback, *perms); | |
4b02b524 | 3287 | if (rc) |
55fcf09b CP |
3288 | goto err; |
3289 | } | |
3290 | ||
3291 | rc = hashtab_map(match->permissions.table, get_permissions_callback, | |
3292 | *perms); | |
4b02b524 | 3293 | if (rc) |
55fcf09b CP |
3294 | goto err; |
3295 | ||
3296 | out: | |
aa8e712c | 3297 | read_unlock(&state->ss->policy_rwlock); |
55fcf09b CP |
3298 | return rc; |
3299 | ||
3300 | err: | |
aa8e712c | 3301 | read_unlock(&state->ss->policy_rwlock); |
55fcf09b CP |
3302 | for (i = 0; i < *nperms; i++) |
3303 | kfree((*perms)[i]); | |
3304 | kfree(*perms); | |
3305 | return rc; | |
3306 | } | |
3307 | ||
aa8e712c | 3308 | int security_get_reject_unknown(struct selinux_state *state) |
3f12070e | 3309 | { |
aa8e712c | 3310 | return state->ss->policydb.reject_unknown; |
3f12070e EP |
3311 | } |
3312 | ||
aa8e712c | 3313 | int security_get_allow_unknown(struct selinux_state *state) |
3f12070e | 3314 | { |
aa8e712c | 3315 | return state->ss->policydb.allow_unknown; |
3f12070e EP |
3316 | } |
3317 | ||
3bb56b25 PM |
3318 | /** |
3319 | * security_policycap_supported - Check for a specific policy capability | |
3320 | * @req_cap: capability | |
3321 | * | |
3322 | * Description: | |
3323 | * This function queries the currently loaded policy to see if it supports the | |
3324 | * capability specified by @req_cap. Returns true (1) if the capability is | |
3325 | * supported, false (0) if it isn't supported. | |
3326 | * | |
3327 | */ | |
aa8e712c SS |
3328 | int security_policycap_supported(struct selinux_state *state, |
3329 | unsigned int req_cap) | |
3bb56b25 | 3330 | { |
aa8e712c | 3331 | struct policydb *policydb = &state->ss->policydb; |
3bb56b25 PM |
3332 | int rc; |
3333 | ||
aa8e712c SS |
3334 | read_lock(&state->ss->policy_rwlock); |
3335 | rc = ebitmap_get_bit(&policydb->policycaps, req_cap); | |
3336 | read_unlock(&state->ss->policy_rwlock); | |
3bb56b25 PM |
3337 | |
3338 | return rc; | |
3339 | } | |
3340 | ||
376bd9cb DG |
3341 | struct selinux_audit_rule { |
3342 | u32 au_seqno; | |
3343 | struct context au_ctxt; | |
3344 | }; | |
3345 | ||
9d57a7f9 | 3346 | void selinux_audit_rule_free(void *vrule) |
376bd9cb | 3347 | { |
9d57a7f9 AD |
3348 | struct selinux_audit_rule *rule = vrule; |
3349 | ||
376bd9cb DG |
3350 | if (rule) { |
3351 | context_destroy(&rule->au_ctxt); | |
3352 | kfree(rule); | |
3353 | } | |
3354 | } | |
3355 | ||
9d57a7f9 | 3356 | int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) |
376bd9cb | 3357 | { |
aa8e712c SS |
3358 | struct selinux_state *state = &selinux_state; |
3359 | struct policydb *policydb = &state->ss->policydb; | |
376bd9cb DG |
3360 | struct selinux_audit_rule *tmprule; |
3361 | struct role_datum *roledatum; | |
3362 | struct type_datum *typedatum; | |
3363 | struct user_datum *userdatum; | |
9d57a7f9 | 3364 | struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; |
376bd9cb DG |
3365 | int rc = 0; |
3366 | ||
3367 | *rule = NULL; | |
3368 | ||
65cddd50 | 3369 | if (!selinux_initialized(state)) |
3ad40d64 | 3370 | return -EOPNOTSUPP; |
376bd9cb DG |
3371 | |
3372 | switch (field) { | |
3a6b9f85 DG |
3373 | case AUDIT_SUBJ_USER: |
3374 | case AUDIT_SUBJ_ROLE: | |
3375 | case AUDIT_SUBJ_TYPE: | |
6e5a2d1d DG |
3376 | case AUDIT_OBJ_USER: |
3377 | case AUDIT_OBJ_ROLE: | |
3378 | case AUDIT_OBJ_TYPE: | |
376bd9cb | 3379 | /* only 'equals' and 'not equals' fit user, role, and type */ |
5af75d8d | 3380 | if (op != Audit_equal && op != Audit_not_equal) |
376bd9cb DG |
3381 | return -EINVAL; |
3382 | break; | |
3a6b9f85 DG |
3383 | case AUDIT_SUBJ_SEN: |
3384 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3385 | case AUDIT_OBJ_LEV_LOW: |
3386 | case AUDIT_OBJ_LEV_HIGH: | |
25985edc | 3387 | /* we do not allow a range, indicated by the presence of '-' */ |
376bd9cb DG |
3388 | if (strchr(rulestr, '-')) |
3389 | return -EINVAL; | |
3390 | break; | |
3391 | default: | |
3392 | /* only the above fields are valid */ | |
3393 | return -EINVAL; | |
3394 | } | |
3395 | ||
3396 | tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); | |
3397 | if (!tmprule) | |
3398 | return -ENOMEM; | |
3399 | ||
3400 | context_init(&tmprule->au_ctxt); | |
3401 | ||
aa8e712c | 3402 | read_lock(&state->ss->policy_rwlock); |
376bd9cb | 3403 | |
aa8e712c | 3404 | tmprule->au_seqno = state->ss->latest_granting; |
376bd9cb DG |
3405 | |
3406 | switch (field) { | |
3a6b9f85 | 3407 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 3408 | case AUDIT_OBJ_USER: |
4b02b524 | 3409 | rc = -EINVAL; |
aa8e712c | 3410 | userdatum = hashtab_search(policydb->p_users.table, rulestr); |
376bd9cb | 3411 | if (!userdatum) |
4b02b524 EP |
3412 | goto out; |
3413 | tmprule->au_ctxt.user = userdatum->value; | |
376bd9cb | 3414 | break; |
3a6b9f85 | 3415 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 3416 | case AUDIT_OBJ_ROLE: |
4b02b524 | 3417 | rc = -EINVAL; |
aa8e712c | 3418 | roledatum = hashtab_search(policydb->p_roles.table, rulestr); |
376bd9cb | 3419 | if (!roledatum) |
4b02b524 EP |
3420 | goto out; |
3421 | tmprule->au_ctxt.role = roledatum->value; | |
376bd9cb | 3422 | break; |
3a6b9f85 | 3423 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 3424 | case AUDIT_OBJ_TYPE: |
4b02b524 | 3425 | rc = -EINVAL; |
aa8e712c | 3426 | typedatum = hashtab_search(policydb->p_types.table, rulestr); |
376bd9cb | 3427 | if (!typedatum) |
4b02b524 EP |
3428 | goto out; |
3429 | tmprule->au_ctxt.type = typedatum->value; | |
376bd9cb | 3430 | break; |
3a6b9f85 DG |
3431 | case AUDIT_SUBJ_SEN: |
3432 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3433 | case AUDIT_OBJ_LEV_LOW: |
3434 | case AUDIT_OBJ_LEV_HIGH: | |
aa8e712c SS |
3435 | rc = mls_from_string(policydb, rulestr, &tmprule->au_ctxt, |
3436 | GFP_ATOMIC); | |
4b02b524 EP |
3437 | if (rc) |
3438 | goto out; | |
376bd9cb DG |
3439 | break; |
3440 | } | |
4b02b524 EP |
3441 | rc = 0; |
3442 | out: | |
aa8e712c | 3443 | read_unlock(&state->ss->policy_rwlock); |
376bd9cb DG |
3444 | |
3445 | if (rc) { | |
3446 | selinux_audit_rule_free(tmprule); | |
3447 | tmprule = NULL; | |
3448 | } | |
3449 | ||
3450 | *rule = tmprule; | |
3451 | ||
3452 | return rc; | |
3453 | } | |
3454 | ||
9d57a7f9 AD |
3455 | /* Check to see if the rule contains any selinux fields */ |
3456 | int selinux_audit_rule_known(struct audit_krule *rule) | |
3457 | { | |
3458 | int i; | |
3459 | ||
3460 | for (i = 0; i < rule->field_count; i++) { | |
3461 | struct audit_field *f = &rule->fields[i]; | |
3462 | switch (f->type) { | |
3463 | case AUDIT_SUBJ_USER: | |
3464 | case AUDIT_SUBJ_ROLE: | |
3465 | case AUDIT_SUBJ_TYPE: | |
3466 | case AUDIT_SUBJ_SEN: | |
3467 | case AUDIT_SUBJ_CLR: | |
3468 | case AUDIT_OBJ_USER: | |
3469 | case AUDIT_OBJ_ROLE: | |
3470 | case AUDIT_OBJ_TYPE: | |
3471 | case AUDIT_OBJ_LEV_LOW: | |
3472 | case AUDIT_OBJ_LEV_HIGH: | |
3473 | return 1; | |
3474 | } | |
3475 | } | |
3476 | ||
3477 | return 0; | |
3478 | } | |
3479 | ||
90462a5b | 3480 | int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule) |
376bd9cb | 3481 | { |
aa8e712c | 3482 | struct selinux_state *state = &selinux_state; |
376bd9cb DG |
3483 | struct context *ctxt; |
3484 | struct mls_level *level; | |
9d57a7f9 | 3485 | struct selinux_audit_rule *rule = vrule; |
376bd9cb DG |
3486 | int match = 0; |
3487 | ||
9ad42a79 RGB |
3488 | if (unlikely(!rule)) { |
3489 | WARN_ONCE(1, "selinux_audit_rule_match: missing rule\n"); | |
376bd9cb DG |
3490 | return -ENOENT; |
3491 | } | |
3492 | ||
aa8e712c | 3493 | read_lock(&state->ss->policy_rwlock); |
376bd9cb | 3494 | |
aa8e712c | 3495 | if (rule->au_seqno < state->ss->latest_granting) { |
376bd9cb DG |
3496 | match = -ESTALE; |
3497 | goto out; | |
3498 | } | |
3499 | ||
24ed7fda | 3500 | ctxt = sidtab_search(state->ss->sidtab, sid); |
9ad42a79 RGB |
3501 | if (unlikely(!ctxt)) { |
3502 | WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n", | |
5d55a345 | 3503 | sid); |
376bd9cb DG |
3504 | match = -ENOENT; |
3505 | goto out; | |
3506 | } | |
3507 | ||
3508 | /* a field/op pair that is not caught here will simply fall through | |
3509 | without a match */ | |
3510 | switch (field) { | |
3a6b9f85 | 3511 | case AUDIT_SUBJ_USER: |
6e5a2d1d | 3512 | case AUDIT_OBJ_USER: |
376bd9cb | 3513 | switch (op) { |
5af75d8d | 3514 | case Audit_equal: |
376bd9cb DG |
3515 | match = (ctxt->user == rule->au_ctxt.user); |
3516 | break; | |
5af75d8d | 3517 | case Audit_not_equal: |
376bd9cb DG |
3518 | match = (ctxt->user != rule->au_ctxt.user); |
3519 | break; | |
3520 | } | |
3521 | break; | |
3a6b9f85 | 3522 | case AUDIT_SUBJ_ROLE: |
6e5a2d1d | 3523 | case AUDIT_OBJ_ROLE: |
376bd9cb | 3524 | switch (op) { |
5af75d8d | 3525 | case Audit_equal: |
376bd9cb DG |
3526 | match = (ctxt->role == rule->au_ctxt.role); |
3527 | break; | |
5af75d8d | 3528 | case Audit_not_equal: |
376bd9cb DG |
3529 | match = (ctxt->role != rule->au_ctxt.role); |
3530 | break; | |
3531 | } | |
3532 | break; | |
3a6b9f85 | 3533 | case AUDIT_SUBJ_TYPE: |
6e5a2d1d | 3534 | case AUDIT_OBJ_TYPE: |
376bd9cb | 3535 | switch (op) { |
5af75d8d | 3536 | case Audit_equal: |
376bd9cb DG |
3537 | match = (ctxt->type == rule->au_ctxt.type); |
3538 | break; | |
5af75d8d | 3539 | case Audit_not_equal: |
376bd9cb DG |
3540 | match = (ctxt->type != rule->au_ctxt.type); |
3541 | break; | |
3542 | } | |
3543 | break; | |
3a6b9f85 DG |
3544 | case AUDIT_SUBJ_SEN: |
3545 | case AUDIT_SUBJ_CLR: | |
6e5a2d1d DG |
3546 | case AUDIT_OBJ_LEV_LOW: |
3547 | case AUDIT_OBJ_LEV_HIGH: | |
3548 | level = ((field == AUDIT_SUBJ_SEN || | |
5d55a345 EP |
3549 | field == AUDIT_OBJ_LEV_LOW) ? |
3550 | &ctxt->range.level[0] : &ctxt->range.level[1]); | |
376bd9cb | 3551 | switch (op) { |
5af75d8d | 3552 | case Audit_equal: |
376bd9cb | 3553 | match = mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3554 | level); |
376bd9cb | 3555 | break; |
5af75d8d | 3556 | case Audit_not_equal: |
376bd9cb | 3557 | match = !mls_level_eq(&rule->au_ctxt.range.level[0], |
5d55a345 | 3558 | level); |
376bd9cb | 3559 | break; |
5af75d8d | 3560 | case Audit_lt: |
376bd9cb | 3561 | match = (mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 EP |
3562 | level) && |
3563 | !mls_level_eq(&rule->au_ctxt.range.level[0], | |
3564 | level)); | |
376bd9cb | 3565 | break; |
5af75d8d | 3566 | case Audit_le: |
376bd9cb | 3567 | match = mls_level_dom(&rule->au_ctxt.range.level[0], |
5d55a345 | 3568 | level); |
376bd9cb | 3569 | break; |
5af75d8d | 3570 | case Audit_gt: |
376bd9cb | 3571 | match = (mls_level_dom(level, |
5d55a345 EP |
3572 | &rule->au_ctxt.range.level[0]) && |
3573 | !mls_level_eq(level, | |
3574 | &rule->au_ctxt.range.level[0])); | |
376bd9cb | 3575 | break; |
5af75d8d | 3576 | case Audit_ge: |
376bd9cb | 3577 | match = mls_level_dom(level, |
5d55a345 | 3578 | &rule->au_ctxt.range.level[0]); |
376bd9cb DG |
3579 | break; |
3580 | } | |
3581 | } | |
3582 | ||
3583 | out: | |
aa8e712c | 3584 | read_unlock(&state->ss->policy_rwlock); |
376bd9cb DG |
3585 | return match; |
3586 | } | |
3587 | ||
9d57a7f9 | 3588 | static int (*aurule_callback)(void) = audit_update_lsm_rules; |
376bd9cb | 3589 | |
562c99f2 | 3590 | static int aurule_avc_callback(u32 event) |
376bd9cb DG |
3591 | { |
3592 | int err = 0; | |
3593 | ||
3594 | if (event == AVC_CALLBACK_RESET && aurule_callback) | |
3595 | err = aurule_callback(); | |
3596 | return err; | |
3597 | } | |
3598 | ||
3599 | static int __init aurule_init(void) | |
3600 | { | |
3601 | int err; | |
3602 | ||
562c99f2 | 3603 | err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET); |
376bd9cb DG |
3604 | if (err) |
3605 | panic("avc_add_callback() failed, error %d\n", err); | |
3606 | ||
3607 | return err; | |
3608 | } | |
3609 | __initcall(aurule_init); | |
3610 | ||
7420ed23 | 3611 | #ifdef CONFIG_NETLABEL |
7420ed23 | 3612 | /** |
5778eabd PM |
3613 | * security_netlbl_cache_add - Add an entry to the NetLabel cache |
3614 | * @secattr: the NetLabel packet security attributes | |
5dbe1eb0 | 3615 | * @sid: the SELinux SID |
7420ed23 VY |
3616 | * |
3617 | * Description: | |
3618 | * Attempt to cache the context in @ctx, which was derived from the packet in | |
5778eabd PM |
3619 | * @skb, in the NetLabel subsystem cache. This function assumes @secattr has |
3620 | * already been initialized. | |
7420ed23 VY |
3621 | * |
3622 | */ | |
5778eabd | 3623 | static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, |
5dbe1eb0 | 3624 | u32 sid) |
7420ed23 | 3625 | { |
5dbe1eb0 | 3626 | u32 *sid_cache; |
7420ed23 | 3627 | |
5dbe1eb0 PM |
3628 | sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); |
3629 | if (sid_cache == NULL) | |
5778eabd | 3630 | return; |
5dbe1eb0 PM |
3631 | secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); |
3632 | if (secattr->cache == NULL) { | |
3633 | kfree(sid_cache); | |
5778eabd | 3634 | return; |
0ec8abd7 | 3635 | } |
7420ed23 | 3636 | |
5dbe1eb0 PM |
3637 | *sid_cache = sid; |
3638 | secattr->cache->free = kfree; | |
3639 | secattr->cache->data = sid_cache; | |
5778eabd | 3640 | secattr->flags |= NETLBL_SECATTR_CACHE; |
7420ed23 VY |
3641 | } |
3642 | ||
3643 | /** | |
5778eabd | 3644 | * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID |
7420ed23 | 3645 | * @secattr: the NetLabel packet security attributes |
7420ed23 VY |
3646 | * @sid: the SELinux SID |
3647 | * | |
3648 | * Description: | |
5778eabd | 3649 | * Convert the given NetLabel security attributes in @secattr into a |
7420ed23 | 3650 | * SELinux SID. If the @secattr field does not contain a full SELinux |
25985edc | 3651 | * SID/context then use SECINITSID_NETMSG as the foundation. If possible the |
5dbe1eb0 PM |
3652 | * 'cache' field of @secattr is set and the CACHE flag is set; this is to |
3653 | * allow the @secattr to be used by NetLabel to cache the secattr to SID | |
3654 | * conversion for future lookups. Returns zero on success, negative values on | |
3655 | * failure. | |
7420ed23 VY |
3656 | * |
3657 | */ | |
aa8e712c SS |
3658 | int security_netlbl_secattr_to_sid(struct selinux_state *state, |
3659 | struct netlbl_lsm_secattr *secattr, | |
5778eabd | 3660 | u32 *sid) |
7420ed23 | 3661 | { |
aa8e712c | 3662 | struct policydb *policydb = &state->ss->policydb; |
24ed7fda | 3663 | struct sidtab *sidtab = state->ss->sidtab; |
7ae9f23c | 3664 | int rc; |
7420ed23 VY |
3665 | struct context *ctx; |
3666 | struct context ctx_new; | |
5778eabd | 3667 | |
65cddd50 | 3668 | if (!selinux_initialized(state)) { |
5778eabd PM |
3669 | *sid = SECSID_NULL; |
3670 | return 0; | |
3671 | } | |
7420ed23 | 3672 | |
aa8e712c | 3673 | read_lock(&state->ss->policy_rwlock); |
7420ed23 | 3674 | |
7ae9f23c | 3675 | if (secattr->flags & NETLBL_SECATTR_CACHE) |
5dbe1eb0 | 3676 | *sid = *(u32 *)secattr->cache->data; |
7ae9f23c | 3677 | else if (secattr->flags & NETLBL_SECATTR_SECID) |
16efd454 | 3678 | *sid = secattr->attr.secid; |
7ae9f23c EP |
3679 | else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { |
3680 | rc = -EIDRM; | |
aa8e712c | 3681 | ctx = sidtab_search(sidtab, SECINITSID_NETMSG); |
7420ed23 | 3682 | if (ctx == NULL) |
7ae9f23c | 3683 | goto out; |
7420ed23 | 3684 | |
81990fbd | 3685 | context_init(&ctx_new); |
7420ed23 VY |
3686 | ctx_new.user = ctx->user; |
3687 | ctx_new.role = ctx->role; | |
3688 | ctx_new.type = ctx->type; | |
aa8e712c | 3689 | mls_import_netlbl_lvl(policydb, &ctx_new, secattr); |
701a90ba | 3690 | if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { |
aa8e712c | 3691 | rc = mls_import_netlbl_cat(policydb, &ctx_new, secattr); |
7ae9f23c EP |
3692 | if (rc) |
3693 | goto out; | |
7420ed23 | 3694 | } |
7ae9f23c | 3695 | rc = -EIDRM; |
aa8e712c | 3696 | if (!mls_context_isvalid(policydb, &ctx_new)) |
7ae9f23c | 3697 | goto out_free; |
7420ed23 | 3698 | |
66f8e2f0 | 3699 | rc = context_struct_to_sid(state, &ctx_new, sid); |
7ae9f23c EP |
3700 | if (rc) |
3701 | goto out_free; | |
7420ed23 | 3702 | |
5dbe1eb0 | 3703 | security_netlbl_cache_add(secattr, *sid); |
5778eabd | 3704 | |
7420ed23 | 3705 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c | 3706 | } else |
388b2405 | 3707 | *sid = SECSID_NULL; |
7420ed23 | 3708 | |
aa8e712c | 3709 | read_unlock(&state->ss->policy_rwlock); |
7ae9f23c EP |
3710 | return 0; |
3711 | out_free: | |
7420ed23 | 3712 | ebitmap_destroy(&ctx_new.range.level[0].cat); |
7ae9f23c | 3713 | out: |
aa8e712c | 3714 | read_unlock(&state->ss->policy_rwlock); |
7ae9f23c | 3715 | return rc; |
7420ed23 VY |
3716 | } |
3717 | ||
3718 | /** | |
5778eabd PM |
3719 | * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr |
3720 | * @sid: the SELinux SID | |
3721 | * @secattr: the NetLabel packet security attributes | |
7420ed23 VY |
3722 | * |
3723 | * Description: | |
5778eabd PM |
3724 | * Convert the given SELinux SID in @sid into a NetLabel security attribute. |
3725 | * Returns zero on success, negative values on failure. | |
7420ed23 VY |
3726 | * |
3727 | */ | |
aa8e712c SS |
3728 | int security_netlbl_sid_to_secattr(struct selinux_state *state, |
3729 | u32 sid, struct netlbl_lsm_secattr *secattr) | |
7420ed23 | 3730 | { |
aa8e712c | 3731 | struct policydb *policydb = &state->ss->policydb; |
99d854d2 | 3732 | int rc; |
7420ed23 VY |
3733 | struct context *ctx; |
3734 | ||
65cddd50 | 3735 | if (!selinux_initialized(state)) |
7420ed23 VY |
3736 | return 0; |
3737 | ||
aa8e712c | 3738 | read_lock(&state->ss->policy_rwlock); |
4b02b524 EP |
3739 | |
3740 | rc = -ENOENT; | |
24ed7fda | 3741 | ctx = sidtab_search(state->ss->sidtab, sid); |
4b02b524 EP |
3742 | if (ctx == NULL) |
3743 | goto out; | |
3744 | ||
3745 | rc = -ENOMEM; | |
aa8e712c | 3746 | secattr->domain = kstrdup(sym_name(policydb, SYM_TYPES, ctx->type - 1), |
5778eabd | 3747 | GFP_ATOMIC); |
4b02b524 EP |
3748 | if (secattr->domain == NULL) |
3749 | goto out; | |
3750 | ||
8d75899d PM |
3751 | secattr->attr.secid = sid; |
3752 | secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; | |
aa8e712c SS |
3753 | mls_export_netlbl_lvl(policydb, ctx, secattr); |
3754 | rc = mls_export_netlbl_cat(policydb, ctx, secattr); | |
4b02b524 | 3755 | out: |
aa8e712c | 3756 | read_unlock(&state->ss->policy_rwlock); |
f8687afe PM |
3757 | return rc; |
3758 | } | |
7420ed23 | 3759 | #endif /* CONFIG_NETLABEL */ |
cee74f47 EP |
3760 | |
3761 | /** | |
3762 | * security_read_policy - read the policy. | |
3763 | * @data: binary policy data | |
3764 | * @len: length of data in bytes | |
3765 | * | |
3766 | */ | |
aa8e712c SS |
3767 | int security_read_policy(struct selinux_state *state, |
3768 | void **data, size_t *len) | |
cee74f47 | 3769 | { |
aa8e712c | 3770 | struct policydb *policydb = &state->ss->policydb; |
cee74f47 EP |
3771 | int rc; |
3772 | struct policy_file fp; | |
3773 | ||
65cddd50 | 3774 | if (!selinux_initialized(state)) |
cee74f47 EP |
3775 | return -EINVAL; |
3776 | ||
aa8e712c | 3777 | *len = security_policydb_len(state); |
cee74f47 | 3778 | |
845ca30f | 3779 | *data = vmalloc_user(*len); |
cee74f47 EP |
3780 | if (!*data) |
3781 | return -ENOMEM; | |
3782 | ||
3783 | fp.data = *data; | |
3784 | fp.len = *len; | |
3785 | ||
aa8e712c SS |
3786 | read_lock(&state->ss->policy_rwlock); |
3787 | rc = policydb_write(policydb, &fp); | |
3788 | read_unlock(&state->ss->policy_rwlock); | |
cee74f47 EP |
3789 | |
3790 | if (rc) | |
3791 | return rc; | |
3792 | ||
3793 | *len = (unsigned long)fp.data - (unsigned long)*data; | |
3794 | return 0; | |
3795 | ||
3796 | } |