2 * Implementation of the security services.
4 * Authors : Stephen Smalley, <sds@epoch.ncsc.mil>
5 * James Morris <jmorris@redhat.com>
7 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
9 * Support for enhanced MLS infrastructure.
11 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
13 * Added conditional policy language extensions
15 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
16 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
17 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation, version 2.
22 #include <linux/kernel.h>
23 #include <linux/slab.h>
24 #include <linux/string.h>
25 #include <linux/spinlock.h>
26 #include <linux/errno.h>
28 #include <linux/sched.h>
29 #include <linux/audit.h>
30 #include <asm/semaphore.h>
39 #include "conditional.h"
42 extern void selnl_notify_policyload(u32 seqno);
43 unsigned int policydb_loaded_version;
45 static DEFINE_RWLOCK(policy_rwlock);
46 #define POLICY_RDLOCK read_lock(&policy_rwlock)
47 #define POLICY_WRLOCK write_lock_irq(&policy_rwlock)
48 #define POLICY_RDUNLOCK read_unlock(&policy_rwlock)
49 #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock)
51 static DECLARE_MUTEX(load_sem);
52 #define LOAD_LOCK down(&load_sem)
53 #define LOAD_UNLOCK up(&load_sem)
55 static struct sidtab sidtab;
56 struct policydb policydb;
57 int ss_initialized = 0;
60 * The largest sequence number that has been used when
61 * providing an access decision to the access vector cache.
62 * The sequence number only changes when a policy change
65 static u32 latest_granting = 0;
67 /* Forward declaration. */
68 static int context_struct_to_string(struct context *context, char **scontext,
72 * Return the boolean value of a constraint expression
73 * when it is applied to the specified source and target
76 * xcontext is a special beast... It is used by the validatetrans rules
77 * only. For these rules, scontext is the context before the transition,
78 * tcontext is the context after the transition, and xcontext is the context
79 * of the process performing the transition. All other callers of
80 * constraint_expr_eval should pass in NULL for xcontext.
82 static int constraint_expr_eval(struct context *scontext,
83 struct context *tcontext,
84 struct context *xcontext,
85 struct constraint_expr *cexpr)
89 struct role_datum *r1, *r2;
90 struct mls_level *l1, *l2;
91 struct constraint_expr *e;
92 int s[CEXPR_MAXDEPTH];
95 for (e = cexpr; e; e = e->next) {
96 switch (e->expr_type) {
112 if (sp == (CEXPR_MAXDEPTH-1))
116 val1 = scontext->user;
117 val2 = tcontext->user;
120 val1 = scontext->type;
121 val2 = tcontext->type;
124 val1 = scontext->role;
125 val2 = tcontext->role;
126 r1 = policydb.role_val_to_struct[val1 - 1];
127 r2 = policydb.role_val_to_struct[val2 - 1];
130 s[++sp] = ebitmap_get_bit(&r1->dominates,
134 s[++sp] = ebitmap_get_bit(&r2->dominates,
138 s[++sp] = ( !ebitmap_get_bit(&r1->dominates,
140 !ebitmap_get_bit(&r2->dominates,
148 l1 = &(scontext->range.level[0]);
149 l2 = &(tcontext->range.level[0]);
152 l1 = &(scontext->range.level[0]);
153 l2 = &(tcontext->range.level[1]);
156 l1 = &(scontext->range.level[1]);
157 l2 = &(tcontext->range.level[0]);
160 l1 = &(scontext->range.level[1]);
161 l2 = &(tcontext->range.level[1]);
164 l1 = &(scontext->range.level[0]);
165 l2 = &(scontext->range.level[1]);
168 l1 = &(tcontext->range.level[0]);
169 l2 = &(tcontext->range.level[1]);
174 s[++sp] = mls_level_eq(l1, l2);
177 s[++sp] = !mls_level_eq(l1, l2);
180 s[++sp] = mls_level_dom(l1, l2);
183 s[++sp] = mls_level_dom(l2, l1);
186 s[++sp] = mls_level_incomp(l2, l1);
200 s[++sp] = (val1 == val2);
203 s[++sp] = (val1 != val2);
211 if (sp == (CEXPR_MAXDEPTH-1))
214 if (e->attr & CEXPR_TARGET)
216 else if (e->attr & CEXPR_XTARGET) {
223 if (e->attr & CEXPR_USER)
225 else if (e->attr & CEXPR_ROLE)
227 else if (e->attr & CEXPR_TYPE)
236 s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
239 s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
257 * Compute access vectors based on a context structure pair for
258 * the permissions in a particular class.
260 static int context_struct_compute_av(struct context *scontext,
261 struct context *tcontext,
264 struct av_decision *avd)
266 struct constraint_node *constraint;
267 struct role_allow *ra;
268 struct avtab_key avkey;
269 struct avtab_datum *avdatum;
270 struct class_datum *tclass_datum;
273 * Remap extended Netlink classes for old policy versions.
274 * Do this here rather than socket_type_to_security_class()
275 * in case a newer policy version is loaded, allowing sockets
276 * to remain in the correct class.
278 if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS)
279 if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET &&
280 tclass <= SECCLASS_NETLINK_DNRT_SOCKET)
281 tclass = SECCLASS_NETLINK_SOCKET;
283 if (!tclass || tclass > policydb.p_classes.nprim) {
284 printk(KERN_ERR "security_compute_av: unrecognized class %d\n",
288 tclass_datum = policydb.class_val_to_struct[tclass - 1];
291 * Initialize the access vectors to the default values.
294 avd->decided = 0xffffffff;
296 avd->auditdeny = 0xffffffff;
297 avd->seqno = latest_granting;
300 * If a specific type enforcement rule was defined for
301 * this permission check, then use it.
303 avkey.source_type = scontext->type;
304 avkey.target_type = tcontext->type;
305 avkey.target_class = tclass;
306 avdatum = avtab_search(&policydb.te_avtab, &avkey, AVTAB_AV);
308 if (avdatum->specified & AVTAB_ALLOWED)
309 avd->allowed = avtab_allowed(avdatum);
310 if (avdatum->specified & AVTAB_AUDITDENY)
311 avd->auditdeny = avtab_auditdeny(avdatum);
312 if (avdatum->specified & AVTAB_AUDITALLOW)
313 avd->auditallow = avtab_auditallow(avdatum);
316 /* Check conditional av table for additional permissions */
317 cond_compute_av(&policydb.te_cond_avtab, &avkey, avd);
320 * Remove any permissions prohibited by a constraint (this includes
323 constraint = tclass_datum->constraints;
325 if ((constraint->permissions & (avd->allowed)) &&
326 !constraint_expr_eval(scontext, tcontext, NULL,
328 avd->allowed = (avd->allowed) & ~(constraint->permissions);
330 constraint = constraint->next;
334 * If checking process transition permission and the
335 * role is changing, then check the (current_role, new_role)
338 if (tclass == SECCLASS_PROCESS &&
339 (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) &&
340 scontext->role != tcontext->role) {
341 for (ra = policydb.role_allow; ra; ra = ra->next) {
342 if (scontext->role == ra->role &&
343 tcontext->role == ra->new_role)
347 avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION |
348 PROCESS__DYNTRANSITION);
354 static int security_validtrans_handle_fail(struct context *ocontext,
355 struct context *ncontext,
356 struct context *tcontext,
359 char *o = NULL, *n = NULL, *t = NULL;
360 u32 olen, nlen, tlen;
362 if (context_struct_to_string(ocontext, &o, &olen) < 0)
364 if (context_struct_to_string(ncontext, &n, &nlen) < 0)
366 if (context_struct_to_string(tcontext, &t, &tlen) < 0)
368 audit_log(current->audit_context, AUDIT_SELINUX_ERR,
369 "security_validate_transition: denied for"
370 " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
371 o, n, t, policydb.p_class_val_to_name[tclass-1]);
377 if (!selinux_enforcing)
382 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
385 struct context *ocontext;
386 struct context *ncontext;
387 struct context *tcontext;
388 struct class_datum *tclass_datum;
389 struct constraint_node *constraint;
398 * Remap extended Netlink classes for old policy versions.
399 * Do this here rather than socket_type_to_security_class()
400 * in case a newer policy version is loaded, allowing sockets
401 * to remain in the correct class.
403 if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS)
404 if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET &&
405 tclass <= SECCLASS_NETLINK_DNRT_SOCKET)
406 tclass = SECCLASS_NETLINK_SOCKET;
408 if (!tclass || tclass > policydb.p_classes.nprim) {
409 printk(KERN_ERR "security_validate_transition: "
410 "unrecognized class %d\n", tclass);
414 tclass_datum = policydb.class_val_to_struct[tclass - 1];
416 ocontext = sidtab_search(&sidtab, oldsid);
418 printk(KERN_ERR "security_validate_transition: "
419 " unrecognized SID %d\n", oldsid);
424 ncontext = sidtab_search(&sidtab, newsid);
426 printk(KERN_ERR "security_validate_transition: "
427 " unrecognized SID %d\n", newsid);
432 tcontext = sidtab_search(&sidtab, tasksid);
434 printk(KERN_ERR "security_validate_transition: "
435 " unrecognized SID %d\n", tasksid);
440 constraint = tclass_datum->validatetrans;
442 if (!constraint_expr_eval(ocontext, ncontext, tcontext,
444 rc = security_validtrans_handle_fail(ocontext, ncontext,
448 constraint = constraint->next;
457 * security_compute_av - Compute access vector decisions.
458 * @ssid: source security identifier
459 * @tsid: target security identifier
460 * @tclass: target security class
461 * @requested: requested permissions
462 * @avd: access vector decisions
464 * Compute a set of access vector decisions based on the
465 * SID pair (@ssid, @tsid) for the permissions in @tclass.
466 * Return -%EINVAL if any of the parameters are invalid or %0
467 * if the access vector decisions were computed successfully.
469 int security_compute_av(u32 ssid,
473 struct av_decision *avd)
475 struct context *scontext = NULL, *tcontext = NULL;
478 if (!ss_initialized) {
479 avd->allowed = 0xffffffff;
480 avd->decided = 0xffffffff;
482 avd->auditdeny = 0xffffffff;
483 avd->seqno = latest_granting;
489 scontext = sidtab_search(&sidtab, ssid);
491 printk(KERN_ERR "security_compute_av: unrecognized SID %d\n",
496 tcontext = sidtab_search(&sidtab, tsid);
498 printk(KERN_ERR "security_compute_av: unrecognized SID %d\n",
504 rc = context_struct_compute_av(scontext, tcontext, tclass,
512 * Write the security context string representation of
513 * the context structure `context' into a dynamically
514 * allocated string of the correct size. Set `*scontext'
515 * to point to this string and set `*scontext_len' to
516 * the length of the string.
518 static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len)
525 /* Compute the size of the context. */
526 *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1;
527 *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1;
528 *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1;
529 *scontext_len += mls_compute_context_len(context);
531 /* Allocate space for the context; caller must free this space. */
532 scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
536 *scontext = scontextp;
539 * Copy the user name, role name and type name into the context.
541 sprintf(scontextp, "%s:%s:%s",
542 policydb.p_user_val_to_name[context->user - 1],
543 policydb.p_role_val_to_name[context->role - 1],
544 policydb.p_type_val_to_name[context->type - 1]);
545 scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) +
546 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) +
547 1 + strlen(policydb.p_type_val_to_name[context->type - 1]);
549 mls_sid_to_context(context, &scontextp);
556 #include "initial_sid_to_string.h"
559 * security_sid_to_context - Obtain a context for a given SID.
560 * @sid: security identifier, SID
561 * @scontext: security context
562 * @scontext_len: length in bytes
564 * Write the string representation of the context associated with @sid
565 * into a dynamically allocated string of the correct size. Set @scontext
566 * to point to this string and set @scontext_len to the length of the string.
568 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len)
570 struct context *context;
573 if (!ss_initialized) {
574 if (sid <= SECINITSID_NUM) {
577 *scontext_len = strlen(initial_sid_to_string[sid]) + 1;
578 scontextp = kmalloc(*scontext_len,GFP_ATOMIC);
579 strcpy(scontextp, initial_sid_to_string[sid]);
580 *scontext = scontextp;
583 printk(KERN_ERR "security_sid_to_context: called before initial "
584 "load_policy on unknown SID %d\n", sid);
589 context = sidtab_search(&sidtab, sid);
591 printk(KERN_ERR "security_sid_to_context: unrecognized SID "
596 rc = context_struct_to_string(context, scontext, scontext_len);
604 static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid)
607 struct context context;
608 struct role_datum *role;
609 struct type_datum *typdatum;
610 struct user_datum *usrdatum;
611 char *scontextp, *p, oldc;
614 if (!ss_initialized) {
617 for (i = 1; i < SECINITSID_NUM; i++) {
618 if (!strcmp(initial_sid_to_string[i], scontext)) {
623 *sid = SECINITSID_KERNEL;
628 /* Copy the string so that we can modify the copy as we parse it.
629 The string should already by null terminated, but we append a
630 null suffix to the copy to avoid problems with the existing
631 attr package, which doesn't view the null terminator as part
632 of the attribute value. */
633 scontext2 = kmalloc(scontext_len+1,GFP_KERNEL);
638 memcpy(scontext2, scontext, scontext_len);
639 scontext2[scontext_len] = 0;
641 context_init(&context);
646 /* Parse the security context. */
649 scontextp = (char *) scontext2;
651 /* Extract the user. */
653 while (*p && *p != ':')
661 usrdatum = hashtab_search(policydb.p_users.table, scontextp);
665 context.user = usrdatum->value;
669 while (*p && *p != ':')
677 role = hashtab_search(policydb.p_roles.table, scontextp);
680 context.role = role->value;
684 while (*p && *p != ':')
689 typdatum = hashtab_search(policydb.p_types.table, scontextp);
693 context.type = typdatum->value;
695 rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid);
699 if ((p - scontext2) < scontext_len) {
704 /* Check the validity of the new context. */
705 if (!policydb_context_isvalid(&policydb, &context)) {
709 /* Obtain the new sid. */
710 rc = sidtab_context_to_sid(&sidtab, &context, sid);
713 context_destroy(&context);
720 * security_context_to_sid - Obtain a SID for a given security context.
721 * @scontext: security context
722 * @scontext_len: length in bytes
723 * @sid: security identifier, SID
725 * Obtains a SID associated with the security context that
726 * has the string representation specified by @scontext.
727 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
728 * memory is available, or 0 on success.
730 int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid)
732 return security_context_to_sid_core(scontext, scontext_len,
737 * security_context_to_sid_default - Obtain a SID for a given security context,
738 * falling back to specified default if needed.
740 * @scontext: security context
741 * @scontext_len: length in bytes
742 * @sid: security identifier, SID
743 * @def_sid: default SID to assign on errror
745 * Obtains a SID associated with the security context that
746 * has the string representation specified by @scontext.
747 * The default SID is passed to the MLS layer to be used to allow
748 * kernel labeling of the MLS field if the MLS field is not present
749 * (for upgrading to MLS without full relabel).
750 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
751 * memory is available, or 0 on success.
753 int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid)
755 return security_context_to_sid_core(scontext, scontext_len,
759 static int compute_sid_handle_invalid_context(
760 struct context *scontext,
761 struct context *tcontext,
763 struct context *newcontext)
765 char *s = NULL, *t = NULL, *n = NULL;
766 u32 slen, tlen, nlen;
768 if (context_struct_to_string(scontext, &s, &slen) < 0)
770 if (context_struct_to_string(tcontext, &t, &tlen) < 0)
772 if (context_struct_to_string(newcontext, &n, &nlen) < 0)
774 audit_log(current->audit_context, AUDIT_SELINUX_ERR,
775 "security_compute_sid: invalid context %s"
779 n, s, t, policydb.p_class_val_to_name[tclass-1]);
784 if (!selinux_enforcing)
789 static int security_compute_sid(u32 ssid,
795 struct context *scontext = NULL, *tcontext = NULL, newcontext;
796 struct role_trans *roletr = NULL;
797 struct avtab_key avkey;
798 struct avtab_datum *avdatum;
799 struct avtab_node *node;
800 unsigned int type_change = 0;
803 if (!ss_initialized) {
805 case SECCLASS_PROCESS:
817 scontext = sidtab_search(&sidtab, ssid);
819 printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n",
824 tcontext = sidtab_search(&sidtab, tsid);
826 printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n",
832 context_init(&newcontext);
834 /* Set the user identity. */
836 case AVTAB_TRANSITION:
838 /* Use the process user identity. */
839 newcontext.user = scontext->user;
842 /* Use the related object owner. */
843 newcontext.user = tcontext->user;
847 /* Set the role and type to default values. */
849 case SECCLASS_PROCESS:
850 /* Use the current role and type of process. */
851 newcontext.role = scontext->role;
852 newcontext.type = scontext->type;
855 /* Use the well-defined object role. */
856 newcontext.role = OBJECT_R_VAL;
857 /* Use the type of the related object. */
858 newcontext.type = tcontext->type;
861 /* Look for a type transition/member/change rule. */
862 avkey.source_type = scontext->type;
863 avkey.target_type = tcontext->type;
864 avkey.target_class = tclass;
865 avdatum = avtab_search(&policydb.te_avtab, &avkey, AVTAB_TYPE);
867 /* If no permanent rule, also check for enabled conditional rules */
869 node = avtab_search_node(&policydb.te_cond_avtab, &avkey, specified);
870 for (; node != NULL; node = avtab_search_node_next(node, specified)) {
871 if (node->datum.specified & AVTAB_ENABLED) {
872 avdatum = &node->datum;
878 type_change = (avdatum && (avdatum->specified & specified));
880 /* Use the type from the type transition/member/change rule. */
882 case AVTAB_TRANSITION:
883 newcontext.type = avtab_transition(avdatum);
886 newcontext.type = avtab_member(avdatum);
889 newcontext.type = avtab_change(avdatum);
894 /* Check for class-specific changes. */
896 case SECCLASS_PROCESS:
897 if (specified & AVTAB_TRANSITION) {
898 /* Look for a role transition rule. */
899 for (roletr = policydb.role_tr; roletr;
900 roletr = roletr->next) {
901 if (roletr->role == scontext->role &&
902 roletr->type == tcontext->type) {
903 /* Use the role transition rule. */
904 newcontext.role = roletr->new_role;
914 /* Set the MLS attributes.
915 This is done last because it may allocate memory. */
916 rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext);
920 /* Check the validity of the context. */
921 if (!policydb_context_isvalid(&policydb, &newcontext)) {
922 rc = compute_sid_handle_invalid_context(scontext,
929 /* Obtain the sid for the context. */
930 rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid);
933 context_destroy(&newcontext);
939 * security_transition_sid - Compute the SID for a new subject/object.
940 * @ssid: source security identifier
941 * @tsid: target security identifier
942 * @tclass: target security class
943 * @out_sid: security identifier for new subject/object
945 * Compute a SID to use for labeling a new subject or object in the
946 * class @tclass based on a SID pair (@ssid, @tsid).
947 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
948 * if insufficient memory is available, or %0 if the new SID was
949 * computed successfully.
951 int security_transition_sid(u32 ssid,
956 return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid);
960 * security_member_sid - Compute the SID for member selection.
961 * @ssid: source security identifier
962 * @tsid: target security identifier
963 * @tclass: target security class
964 * @out_sid: security identifier for selected member
966 * Compute a SID to use when selecting a member of a polyinstantiated
967 * object of class @tclass based on a SID pair (@ssid, @tsid).
968 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
969 * if insufficient memory is available, or %0 if the SID was
970 * computed successfully.
972 int security_member_sid(u32 ssid,
977 return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid);
981 * security_change_sid - Compute the SID for object relabeling.
982 * @ssid: source security identifier
983 * @tsid: target security identifier
984 * @tclass: target security class
985 * @out_sid: security identifier for selected member
987 * Compute a SID to use for relabeling an object of class @tclass
988 * based on a SID pair (@ssid, @tsid).
989 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
990 * if insufficient memory is available, or %0 if the SID was
991 * computed successfully.
993 int security_change_sid(u32 ssid,
998 return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid);
1002 * Verify that each permission that is defined under the
1003 * existing policy is still defined with the same value
1004 * in the new policy.
1006 static int validate_perm(void *key, void *datum, void *p)
1009 struct perm_datum *perdatum, *perdatum2;
1016 perdatum2 = hashtab_search(h, key);
1018 printk(KERN_ERR "security: permission %s disappeared",
1023 if (perdatum->value != perdatum2->value) {
1024 printk(KERN_ERR "security: the value of permission %s changed",
1033 * Verify that each class that is defined under the
1034 * existing policy is still defined with the same
1035 * attributes in the new policy.
1037 static int validate_class(void *key, void *datum, void *p)
1039 struct policydb *newp;
1040 struct class_datum *cladatum, *cladatum2;
1046 cladatum2 = hashtab_search(newp->p_classes.table, key);
1048 printk(KERN_ERR "security: class %s disappeared\n",
1053 if (cladatum->value != cladatum2->value) {
1054 printk(KERN_ERR "security: the value of class %s changed\n",
1059 if ((cladatum->comdatum && !cladatum2->comdatum) ||
1060 (!cladatum->comdatum && cladatum2->comdatum)) {
1061 printk(KERN_ERR "security: the inherits clause for the access "
1062 "vector definition for class %s changed\n", (char *)key);
1066 if (cladatum->comdatum) {
1067 rc = hashtab_map(cladatum->comdatum->permissions.table, validate_perm,
1068 cladatum2->comdatum->permissions.table);
1070 printk(" in the access vector definition for class "
1071 "%s\n", (char *)key);
1075 rc = hashtab_map(cladatum->permissions.table, validate_perm,
1076 cladatum2->permissions.table);
1078 printk(" in access vector definition for class %s\n",
1084 /* Clone the SID into the new SID table. */
1085 static int clone_sid(u32 sid,
1086 struct context *context,
1089 struct sidtab *s = arg;
1091 return sidtab_insert(s, sid, context);
1094 static inline int convert_context_handle_invalid_context(struct context *context)
1098 if (selinux_enforcing) {
1104 context_struct_to_string(context, &s, &len);
1105 printk(KERN_ERR "security: context %s is invalid\n", s);
1111 struct convert_context_args {
1112 struct policydb *oldp;
1113 struct policydb *newp;
1117 * Convert the values in the security context
1118 * structure `c' from the values specified
1119 * in the policy `p->oldp' to the values specified
1120 * in the policy `p->newp'. Verify that the
1121 * context is valid under the new policy.
1123 static int convert_context(u32 key,
1127 struct convert_context_args *args;
1128 struct context oldc;
1129 struct role_datum *role;
1130 struct type_datum *typdatum;
1131 struct user_datum *usrdatum;
1138 rc = context_cpy(&oldc, c);
1144 /* Convert the user. */
1145 usrdatum = hashtab_search(args->newp->p_users.table,
1146 args->oldp->p_user_val_to_name[c->user - 1]);
1150 c->user = usrdatum->value;
1152 /* Convert the role. */
1153 role = hashtab_search(args->newp->p_roles.table,
1154 args->oldp->p_role_val_to_name[c->role - 1]);
1158 c->role = role->value;
1160 /* Convert the type. */
1161 typdatum = hashtab_search(args->newp->p_types.table,
1162 args->oldp->p_type_val_to_name[c->type - 1]);
1166 c->type = typdatum->value;
1168 rc = mls_convert_context(args->oldp, args->newp, c);
1172 /* Check the validity of the new context. */
1173 if (!policydb_context_isvalid(args->newp, c)) {
1174 rc = convert_context_handle_invalid_context(&oldc);
1179 context_destroy(&oldc);
1183 context_struct_to_string(&oldc, &s, &len);
1184 context_destroy(&oldc);
1185 printk(KERN_ERR "security: invalidating context %s\n", s);
1190 extern void selinux_complete_init(void);
1193 * security_load_policy - Load a security policy configuration.
1194 * @data: binary policy data
1195 * @len: length of data in bytes
1197 * Load a new set of security policy configuration data,
1198 * validate it and convert the SID table as necessary.
1199 * This function will flush the access vector cache after
1200 * loading the new policy.
1202 int security_load_policy(void *data, size_t len)
1204 struct policydb oldpolicydb, newpolicydb;
1205 struct sidtab oldsidtab, newsidtab;
1206 struct convert_context_args args;
1209 struct policy_file file = { data, len }, *fp = &file;
1213 if (!ss_initialized) {
1215 if (policydb_read(&policydb, fp)) {
1217 avtab_cache_destroy();
1220 if (policydb_load_isids(&policydb, &sidtab)) {
1222 policydb_destroy(&policydb);
1223 avtab_cache_destroy();
1226 policydb_loaded_version = policydb.policyvers;
1228 seqno = ++latest_granting;
1230 selinux_complete_init();
1231 avc_ss_reset(seqno);
1232 selnl_notify_policyload(seqno);
1237 sidtab_hash_eval(&sidtab, "sids");
1240 if (policydb_read(&newpolicydb, fp)) {
1245 sidtab_init(&newsidtab);
1247 /* Verify that the existing classes did not change. */
1248 if (hashtab_map(policydb.p_classes.table, validate_class, &newpolicydb)) {
1249 printk(KERN_ERR "security: the definition of an existing "
1255 /* Clone the SID table. */
1256 sidtab_shutdown(&sidtab);
1257 if (sidtab_map(&sidtab, clone_sid, &newsidtab)) {
1262 /* Convert the internal representations of contexts
1263 in the new SID table and remove invalid SIDs. */
1264 args.oldp = &policydb;
1265 args.newp = &newpolicydb;
1266 sidtab_map_remove_on_error(&newsidtab, convert_context, &args);
1268 /* Save the old policydb and SID table to free later. */
1269 memcpy(&oldpolicydb, &policydb, sizeof policydb);
1270 sidtab_set(&oldsidtab, &sidtab);
1272 /* Install the new policydb and SID table. */
1274 memcpy(&policydb, &newpolicydb, sizeof policydb);
1275 sidtab_set(&sidtab, &newsidtab);
1276 seqno = ++latest_granting;
1277 policydb_loaded_version = policydb.policyvers;
1281 /* Free the old policydb and SID table. */
1282 policydb_destroy(&oldpolicydb);
1283 sidtab_destroy(&oldsidtab);
1285 avc_ss_reset(seqno);
1286 selnl_notify_policyload(seqno);
1292 sidtab_destroy(&newsidtab);
1293 policydb_destroy(&newpolicydb);
1299 * security_port_sid - Obtain the SID for a port.
1300 * @domain: communication domain aka address family
1301 * @type: socket type
1302 * @protocol: protocol number
1303 * @port: port number
1304 * @out_sid: security identifier
1306 int security_port_sid(u16 domain,
1317 c = policydb.ocontexts[OCON_PORT];
1319 if (c->u.port.protocol == protocol &&
1320 c->u.port.low_port <= port &&
1321 c->u.port.high_port >= port)
1328 rc = sidtab_context_to_sid(&sidtab,
1334 *out_sid = c->sid[0];
1336 *out_sid = SECINITSID_PORT;
1345 * security_netif_sid - Obtain the SID for a network interface.
1346 * @name: interface name
1347 * @if_sid: interface SID
1348 * @msg_sid: default SID for received packets
1350 int security_netif_sid(char *name,
1359 c = policydb.ocontexts[OCON_NETIF];
1361 if (strcmp(name, c->u.name) == 0)
1367 if (!c->sid[0] || !c->sid[1]) {
1368 rc = sidtab_context_to_sid(&sidtab,
1373 rc = sidtab_context_to_sid(&sidtab,
1379 *if_sid = c->sid[0];
1380 *msg_sid = c->sid[1];
1382 *if_sid = SECINITSID_NETIF;
1383 *msg_sid = SECINITSID_NETMSG;
1391 static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
1395 for(i = 0; i < 4; i++)
1396 if(addr[i] != (input[i] & mask[i])) {
1405 * security_node_sid - Obtain the SID for a node (host).
1406 * @domain: communication domain aka address family
1408 * @addrlen: address length in bytes
1409 * @out_sid: security identifier
1411 int security_node_sid(u16 domain,
1425 if (addrlen != sizeof(u32)) {
1430 addr = *((u32 *)addrp);
1432 c = policydb.ocontexts[OCON_NODE];
1434 if (c->u.node.addr == (addr & c->u.node.mask))
1442 if (addrlen != sizeof(u64) * 2) {
1446 c = policydb.ocontexts[OCON_NODE6];
1448 if (match_ipv6_addrmask(addrp, c->u.node6.addr,
1456 *out_sid = SECINITSID_NODE;
1462 rc = sidtab_context_to_sid(&sidtab,
1468 *out_sid = c->sid[0];
1470 *out_sid = SECINITSID_NODE;
1481 * security_get_user_sids - Obtain reachable SIDs for a user.
1482 * @fromsid: starting SID
1483 * @username: username
1484 * @sids: array of reachable SIDs for user
1485 * @nel: number of elements in @sids
1487 * Generate the set of SIDs for legal security contexts
1488 * for a given user that can be reached by @fromsid.
1489 * Set *@sids to point to a dynamically allocated
1490 * array containing the set of SIDs. Set *@nel to the
1491 * number of elements in the array.
1494 int security_get_user_sids(u32 fromsid,
1499 struct context *fromcon, usercon;
1500 u32 *mysids, *mysids2, sid;
1501 u32 mynel = 0, maxnel = SIDS_NEL;
1502 struct user_datum *user;
1503 struct role_datum *role;
1504 struct av_decision avd;
1507 if (!ss_initialized) {
1515 fromcon = sidtab_search(&sidtab, fromsid);
1521 user = hashtab_search(policydb.p_users.table, username);
1526 usercon.user = user->value;
1528 mysids = kmalloc(maxnel*sizeof(*mysids), GFP_ATOMIC);
1533 memset(mysids, 0, maxnel*sizeof(*mysids));
1535 for (i = ebitmap_startbit(&user->roles); i < ebitmap_length(&user->roles); i++) {
1536 if (!ebitmap_get_bit(&user->roles, i))
1538 role = policydb.role_val_to_struct[i];
1540 for (j = ebitmap_startbit(&role->types); j < ebitmap_length(&role->types); j++) {
1541 if (!ebitmap_get_bit(&role->types, j))
1545 if (mls_setup_user_range(fromcon, user, &usercon))
1548 rc = context_struct_compute_av(fromcon, &usercon,
1550 PROCESS__TRANSITION,
1552 if (rc || !(avd.allowed & PROCESS__TRANSITION))
1554 rc = sidtab_context_to_sid(&sidtab, &usercon, &sid);
1559 if (mynel < maxnel) {
1560 mysids[mynel++] = sid;
1563 mysids2 = kmalloc(maxnel*sizeof(*mysids2), GFP_ATOMIC);
1569 memset(mysids2, 0, maxnel*sizeof(*mysids2));
1570 memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
1573 mysids[mynel++] = sid;
1588 * security_genfs_sid - Obtain a SID for a file in a filesystem
1589 * @fstype: filesystem type
1590 * @path: path from root of mount
1591 * @sclass: file security class
1592 * @sid: SID for path
1594 * Obtain a SID to use for a file in a filesystem that
1595 * cannot support xattr or use a fixed labeling behavior like
1596 * transition SIDs or task SIDs.
1598 int security_genfs_sid(const char *fstype,
1604 struct genfs *genfs;
1606 int rc = 0, cmp = 0;
1610 for (genfs = policydb.genfs; genfs; genfs = genfs->next) {
1611 cmp = strcmp(fstype, genfs->fstype);
1616 if (!genfs || cmp) {
1617 *sid = SECINITSID_UNLABELED;
1622 for (c = genfs->head; c; c = c->next) {
1623 len = strlen(c->u.name);
1624 if ((!c->v.sclass || sclass == c->v.sclass) &&
1625 (strncmp(c->u.name, path, len) == 0))
1630 *sid = SECINITSID_UNLABELED;
1636 rc = sidtab_context_to_sid(&sidtab,
1650 * security_fs_use - Determine how to handle labeling for a filesystem.
1651 * @fstype: filesystem type
1652 * @behavior: labeling behavior
1653 * @sid: SID for filesystem (superblock)
1655 int security_fs_use(
1657 unsigned int *behavior,
1665 c = policydb.ocontexts[OCON_FSUSE];
1667 if (strcmp(fstype, c->u.name) == 0)
1673 *behavior = c->v.behavior;
1675 rc = sidtab_context_to_sid(&sidtab,
1683 rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid);
1685 *behavior = SECURITY_FS_USE_NONE;
1688 *behavior = SECURITY_FS_USE_GENFS;
1697 int security_get_bools(int *len, char ***names, int **values)
1699 int i, rc = -ENOMEM;
1705 *len = policydb.p_bools.nprim;
1711 *names = (char**)kmalloc(sizeof(char*) * *len, GFP_ATOMIC);
1714 memset(*names, 0, sizeof(char*) * *len);
1716 *values = (int*)kmalloc(sizeof(int) * *len, GFP_ATOMIC);
1720 for (i = 0; i < *len; i++) {
1722 (*values)[i] = policydb.bool_val_to_struct[i]->state;
1723 name_len = strlen(policydb.p_bool_val_to_name[i]) + 1;
1724 (*names)[i] = (char*)kmalloc(sizeof(char) * name_len, GFP_ATOMIC);
1727 strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len);
1728 (*names)[i][name_len - 1] = 0;
1736 for (i = 0; i < *len; i++)
1744 int security_set_bools(int len, int *values)
1747 int lenp, seqno = 0;
1748 struct cond_node *cur;
1752 lenp = policydb.p_bools.nprim;
1758 printk(KERN_INFO "security: committed booleans { ");
1759 for (i = 0; i < len; i++) {
1761 policydb.bool_val_to_struct[i]->state = 1;
1763 policydb.bool_val_to_struct[i]->state = 0;
1767 printk("%s:%d", policydb.p_bool_val_to_name[i],
1768 policydb.bool_val_to_struct[i]->state);
1772 for (cur = policydb.cond_list; cur != NULL; cur = cur->next) {
1773 rc = evaluate_cond_node(&policydb, cur);
1778 seqno = ++latest_granting;
1783 avc_ss_reset(seqno);
1784 selnl_notify_policyload(seqno);
1789 int security_get_bool_value(int bool)
1796 len = policydb.p_bools.nprim;
1802 rc = policydb.bool_val_to_struct[bool]->state;