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