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