1 // SPDX-License-Identifier: GPL-2.0-only
3 * Implementation of the security services.
5 * Authors : Stephen Smalley, <sds@tycho.nsa.gov>
6 * James Morris <jmorris@redhat.com>
8 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
10 * Support for enhanced MLS infrastructure.
11 * Support for context based audit filters.
13 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
15 * Added conditional policy language extensions
17 * Updated: Hewlett-Packard <paul@paul-moore.com>
19 * Added support for NetLabel
20 * Added support for the policy capability bitmap
22 * Updated: Chad Sellers <csellers@tresys.com>
24 * Added validation of kernel classes and permissions
26 * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com>
28 * Added support for bounds domain and audit messaged on masked permissions
30 * Updated: Guido Trentalancia <guido@trentalancia.com>
32 * Added support for runtime switching of the policy type
34 * Copyright (C) 2008, 2009 NEC Corporation
35 * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
36 * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
37 * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC
38 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
40 #include <linux/kernel.h>
41 #include <linux/slab.h>
42 #include <linux/string.h>
43 #include <linux/spinlock.h>
44 #include <linux/rcupdate.h>
45 #include <linux/errno.h>
47 #include <linux/sched.h>
48 #include <linux/audit.h>
49 #include <linux/vmalloc.h>
50 #include <net/netlabel.h>
60 #include "conditional.h"
67 #include "policycap_names.h"
70 struct convert_context_args {
71 struct selinux_state *state;
72 struct policydb *oldp;
73 struct policydb *newp;
76 struct selinux_policy_convert_data {
77 struct convert_context_args args;
78 struct sidtab_convert_params sidtab_params;
81 /* Forward declaration. */
82 static int context_struct_to_string(struct policydb *policydb,
83 struct context *context,
87 static int sidtab_entry_to_string(struct policydb *policydb,
88 struct sidtab *sidtab,
89 struct sidtab_entry *entry,
93 static void context_struct_compute_av(struct policydb *policydb,
94 struct context *scontext,
95 struct context *tcontext,
97 struct av_decision *avd,
98 struct extended_perms *xperms);
100 static int selinux_set_mapping(struct policydb *pol,
101 struct security_class_mapping *map,
102 struct selinux_map *out_map)
106 bool print_unknown_handle = false;
108 /* Find number of classes in the input mapping */
115 /* Allocate space for the class records, plus one for class zero */
116 out_map->mapping = kcalloc(++i, sizeof(*out_map->mapping), GFP_ATOMIC);
117 if (!out_map->mapping)
120 /* Store the raw class and permission values */
122 while (map[j].name) {
123 struct security_class_mapping *p_in = map + (j++);
124 struct selinux_mapping *p_out = out_map->mapping + j;
126 /* An empty class string skips ahead */
127 if (!strcmp(p_in->name, "")) {
128 p_out->num_perms = 0;
132 p_out->value = string_to_security_class(pol, p_in->name);
134 pr_info("SELinux: Class %s not defined in policy.\n",
136 if (pol->reject_unknown)
138 p_out->num_perms = 0;
139 print_unknown_handle = true;
144 while (p_in->perms[k]) {
145 /* An empty permission string skips ahead */
146 if (!*p_in->perms[k]) {
150 p_out->perms[k] = string_to_av_perm(pol, p_out->value,
152 if (!p_out->perms[k]) {
153 pr_info("SELinux: Permission %s in class %s not defined in policy.\n",
154 p_in->perms[k], p_in->name);
155 if (pol->reject_unknown)
157 print_unknown_handle = true;
162 p_out->num_perms = k;
165 if (print_unknown_handle)
166 pr_info("SELinux: the above unknown classes and permissions will be %s\n",
167 pol->allow_unknown ? "allowed" : "denied");
172 kfree(out_map->mapping);
173 out_map->mapping = NULL;
178 * Get real, policy values from mapped values
181 static u16 unmap_class(struct selinux_map *map, u16 tclass)
183 if (tclass < map->size)
184 return map->mapping[tclass].value;
190 * Get kernel value for class from its policy value
192 static u16 map_class(struct selinux_map *map, u16 pol_value)
196 for (i = 1; i < map->size; i++) {
197 if (map->mapping[i].value == pol_value)
201 return SECCLASS_NULL;
204 static void map_decision(struct selinux_map *map,
205 u16 tclass, struct av_decision *avd,
208 if (tclass < map->size) {
209 struct selinux_mapping *mapping = &map->mapping[tclass];
210 unsigned int i, n = mapping->num_perms;
213 for (i = 0, result = 0; i < n; i++) {
214 if (avd->allowed & mapping->perms[i])
216 if (allow_unknown && !mapping->perms[i])
219 avd->allowed = result;
221 for (i = 0, result = 0; i < n; i++)
222 if (avd->auditallow & mapping->perms[i])
224 avd->auditallow = result;
226 for (i = 0, result = 0; i < n; i++) {
227 if (avd->auditdeny & mapping->perms[i])
229 if (!allow_unknown && !mapping->perms[i])
233 * In case the kernel has a bug and requests a permission
234 * between num_perms and the maximum permission number, we
235 * should audit that denial
237 for (; i < (sizeof(u32)*8); i++)
239 avd->auditdeny = result;
243 int security_mls_enabled(struct selinux_state *state)
246 struct selinux_policy *policy;
248 if (!selinux_initialized(state))
252 policy = rcu_dereference(state->policy);
253 mls_enabled = policy->policydb.mls_enabled;
259 * Return the boolean value of a constraint expression
260 * when it is applied to the specified source and target
263 * xcontext is a special beast... It is used by the validatetrans rules
264 * only. For these rules, scontext is the context before the transition,
265 * tcontext is the context after the transition, and xcontext is the context
266 * of the process performing the transition. All other callers of
267 * constraint_expr_eval should pass in NULL for xcontext.
269 static int constraint_expr_eval(struct policydb *policydb,
270 struct context *scontext,
271 struct context *tcontext,
272 struct context *xcontext,
273 struct constraint_expr *cexpr)
277 struct role_datum *r1, *r2;
278 struct mls_level *l1, *l2;
279 struct constraint_expr *e;
280 int s[CEXPR_MAXDEPTH];
283 for (e = cexpr; e; e = e->next) {
284 switch (e->expr_type) {
300 if (sp == (CEXPR_MAXDEPTH - 1))
304 val1 = scontext->user;
305 val2 = tcontext->user;
308 val1 = scontext->type;
309 val2 = tcontext->type;
312 val1 = scontext->role;
313 val2 = tcontext->role;
314 r1 = policydb->role_val_to_struct[val1 - 1];
315 r2 = policydb->role_val_to_struct[val2 - 1];
318 s[++sp] = ebitmap_get_bit(&r1->dominates,
322 s[++sp] = ebitmap_get_bit(&r2->dominates,
326 s[++sp] = (!ebitmap_get_bit(&r1->dominates,
328 !ebitmap_get_bit(&r2->dominates,
336 l1 = &(scontext->range.level[0]);
337 l2 = &(tcontext->range.level[0]);
340 l1 = &(scontext->range.level[0]);
341 l2 = &(tcontext->range.level[1]);
344 l1 = &(scontext->range.level[1]);
345 l2 = &(tcontext->range.level[0]);
348 l1 = &(scontext->range.level[1]);
349 l2 = &(tcontext->range.level[1]);
352 l1 = &(scontext->range.level[0]);
353 l2 = &(scontext->range.level[1]);
356 l1 = &(tcontext->range.level[0]);
357 l2 = &(tcontext->range.level[1]);
362 s[++sp] = mls_level_eq(l1, l2);
365 s[++sp] = !mls_level_eq(l1, l2);
368 s[++sp] = mls_level_dom(l1, l2);
371 s[++sp] = mls_level_dom(l2, l1);
374 s[++sp] = mls_level_incomp(l2, l1);
388 s[++sp] = (val1 == val2);
391 s[++sp] = (val1 != val2);
399 if (sp == (CEXPR_MAXDEPTH-1))
402 if (e->attr & CEXPR_TARGET)
404 else if (e->attr & CEXPR_XTARGET) {
411 if (e->attr & CEXPR_USER)
413 else if (e->attr & CEXPR_ROLE)
415 else if (e->attr & CEXPR_TYPE)
424 s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
427 s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
445 * security_dump_masked_av - dumps masked permissions during
446 * security_compute_av due to RBAC, MLS/Constraint and Type bounds.
448 static int dump_masked_av_helper(void *k, void *d, void *args)
450 struct perm_datum *pdatum = d;
451 char **permission_names = args;
453 BUG_ON(pdatum->value < 1 || pdatum->value > 32);
455 permission_names[pdatum->value - 1] = (char *)k;
460 static void security_dump_masked_av(struct policydb *policydb,
461 struct context *scontext,
462 struct context *tcontext,
467 struct common_datum *common_dat;
468 struct class_datum *tclass_dat;
469 struct audit_buffer *ab;
471 char *scontext_name = NULL;
472 char *tcontext_name = NULL;
473 char *permission_names[32];
476 bool need_comma = false;
481 tclass_name = sym_name(policydb, SYM_CLASSES, tclass - 1);
482 tclass_dat = policydb->class_val_to_struct[tclass - 1];
483 common_dat = tclass_dat->comdatum;
485 /* init permission_names */
487 hashtab_map(&common_dat->permissions.table,
488 dump_masked_av_helper, permission_names) < 0)
491 if (hashtab_map(&tclass_dat->permissions.table,
492 dump_masked_av_helper, permission_names) < 0)
495 /* get scontext/tcontext in text form */
496 if (context_struct_to_string(policydb, scontext,
497 &scontext_name, &length) < 0)
500 if (context_struct_to_string(policydb, tcontext,
501 &tcontext_name, &length) < 0)
504 /* audit a message */
505 ab = audit_log_start(audit_context(),
506 GFP_ATOMIC, AUDIT_SELINUX_ERR);
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);
514 for (index = 0; index < 32; index++) {
515 u32 mask = (1 << index);
517 if ((mask & permissions) == 0)
520 audit_log_format(ab, "%s%s",
521 need_comma ? "," : "",
522 permission_names[index]
523 ? permission_names[index] : "????");
528 /* release scontext/tcontext */
529 kfree(tcontext_name);
530 kfree(scontext_name);
536 * security_boundary_permission - drops violated permissions
537 * on boundary constraint.
539 static void type_attribute_bounds_av(struct policydb *policydb,
540 struct context *scontext,
541 struct context *tcontext,
543 struct av_decision *avd)
545 struct context lo_scontext;
546 struct context lo_tcontext, *tcontextp = tcontext;
547 struct av_decision lo_avd;
548 struct type_datum *source;
549 struct type_datum *target;
552 source = policydb->type_val_to_struct[scontext->type - 1];
558 target = policydb->type_val_to_struct[tcontext->type - 1];
561 memset(&lo_avd, 0, sizeof(lo_avd));
563 memcpy(&lo_scontext, scontext, sizeof(lo_scontext));
564 lo_scontext.type = source->bounds;
566 if (target->bounds) {
567 memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext));
568 lo_tcontext.type = target->bounds;
569 tcontextp = &lo_tcontext;
572 context_struct_compute_av(policydb, &lo_scontext,
578 masked = ~lo_avd.allowed & avd->allowed;
581 return; /* no masked permission */
583 /* mask violated permissions */
584 avd->allowed &= ~masked;
586 /* audit masked permissions */
587 security_dump_masked_av(policydb, scontext, tcontext,
588 tclass, masked, "bounds");
592 * flag which drivers have permissions
593 * only looking for ioctl based extended permssions
595 void services_compute_xperms_drivers(
596 struct extended_perms *xperms,
597 struct avtab_node *node)
601 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
602 /* if one or more driver has all permissions allowed */
603 for (i = 0; i < ARRAY_SIZE(xperms->drivers.p); i++)
604 xperms->drivers.p[i] |= node->datum.u.xperms->perms.p[i];
605 } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
606 /* if allowing permissions within a driver */
607 security_xperm_set(xperms->drivers.p,
608 node->datum.u.xperms->driver);
615 * Compute access vectors and extended permissions based on a context
616 * structure pair for the permissions in a particular class.
618 static void context_struct_compute_av(struct policydb *policydb,
619 struct context *scontext,
620 struct context *tcontext,
622 struct av_decision *avd,
623 struct extended_perms *xperms)
625 struct constraint_node *constraint;
626 struct role_allow *ra;
627 struct avtab_key avkey;
628 struct avtab_node *node;
629 struct class_datum *tclass_datum;
630 struct ebitmap *sattr, *tattr;
631 struct ebitmap_node *snode, *tnode;
636 avd->auditdeny = 0xffffffff;
638 memset(&xperms->drivers, 0, sizeof(xperms->drivers));
642 if (unlikely(!tclass || tclass > policydb->p_classes.nprim)) {
643 if (printk_ratelimit())
644 pr_warn("SELinux: Invalid class %hu\n", tclass);
648 tclass_datum = policydb->class_val_to_struct[tclass - 1];
651 * If a specific type enforcement rule was defined for
652 * this permission check, then use it.
654 avkey.target_class = tclass;
655 avkey.specified = AVTAB_AV | AVTAB_XPERMS;
656 sattr = &policydb->type_attr_map_array[scontext->type - 1];
657 tattr = &policydb->type_attr_map_array[tcontext->type - 1];
658 ebitmap_for_each_positive_bit(sattr, snode, i) {
659 ebitmap_for_each_positive_bit(tattr, tnode, j) {
660 avkey.source_type = i + 1;
661 avkey.target_type = j + 1;
662 for (node = avtab_search_node(&policydb->te_avtab,
665 node = avtab_search_node_next(node, avkey.specified)) {
666 if (node->key.specified == AVTAB_ALLOWED)
667 avd->allowed |= node->datum.u.data;
668 else if (node->key.specified == AVTAB_AUDITALLOW)
669 avd->auditallow |= node->datum.u.data;
670 else if (node->key.specified == AVTAB_AUDITDENY)
671 avd->auditdeny &= node->datum.u.data;
672 else if (xperms && (node->key.specified & AVTAB_XPERMS))
673 services_compute_xperms_drivers(xperms, node);
676 /* Check conditional av table for additional permissions */
677 cond_compute_av(&policydb->te_cond_avtab, &avkey,
684 * Remove any permissions prohibited by a constraint (this includes
687 constraint = tclass_datum->constraints;
689 if ((constraint->permissions & (avd->allowed)) &&
690 !constraint_expr_eval(policydb, scontext, tcontext, NULL,
692 avd->allowed &= ~(constraint->permissions);
694 constraint = constraint->next;
698 * If checking process transition permission and the
699 * role is changing, then check the (current_role, new_role)
702 if (tclass == policydb->process_class &&
703 (avd->allowed & policydb->process_trans_perms) &&
704 scontext->role != tcontext->role) {
705 for (ra = policydb->role_allow; ra; ra = ra->next) {
706 if (scontext->role == ra->role &&
707 tcontext->role == ra->new_role)
711 avd->allowed &= ~policydb->process_trans_perms;
715 * If the given source and target types have boundary
716 * constraint, lazy checks have to mask any violated
717 * permission and notice it to userspace via audit.
719 type_attribute_bounds_av(policydb, scontext, tcontext,
723 static int security_validtrans_handle_fail(struct selinux_state *state,
724 struct selinux_policy *policy,
725 struct sidtab_entry *oentry,
726 struct sidtab_entry *nentry,
727 struct sidtab_entry *tentry,
730 struct policydb *p = &policy->policydb;
731 struct sidtab *sidtab = policy->sidtab;
732 char *o = NULL, *n = NULL, *t = NULL;
733 u32 olen, nlen, tlen;
735 if (sidtab_entry_to_string(p, sidtab, oentry, &o, &olen))
737 if (sidtab_entry_to_string(p, sidtab, nentry, &n, &nlen))
739 if (sidtab_entry_to_string(p, sidtab, tentry, &t, &tlen))
741 audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR,
742 "op=security_validate_transition seresult=denied"
743 " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
744 o, n, t, sym_name(p, SYM_CLASSES, tclass-1));
750 if (!enforcing_enabled(state))
755 static int security_compute_validatetrans(struct selinux_state *state,
756 u32 oldsid, u32 newsid, u32 tasksid,
757 u16 orig_tclass, bool user)
759 struct selinux_policy *policy;
760 struct policydb *policydb;
761 struct sidtab *sidtab;
762 struct sidtab_entry *oentry;
763 struct sidtab_entry *nentry;
764 struct sidtab_entry *tentry;
765 struct class_datum *tclass_datum;
766 struct constraint_node *constraint;
771 if (!selinux_initialized(state))
776 policy = rcu_dereference(state->policy);
777 policydb = &policy->policydb;
778 sidtab = policy->sidtab;
781 tclass = unmap_class(&policy->map, orig_tclass);
783 tclass = orig_tclass;
785 if (!tclass || tclass > policydb->p_classes.nprim) {
789 tclass_datum = policydb->class_val_to_struct[tclass - 1];
791 oentry = sidtab_search_entry(sidtab, oldsid);
793 pr_err("SELinux: %s: unrecognized SID %d\n",
799 nentry = sidtab_search_entry(sidtab, newsid);
801 pr_err("SELinux: %s: unrecognized SID %d\n",
807 tentry = sidtab_search_entry(sidtab, tasksid);
809 pr_err("SELinux: %s: unrecognized SID %d\n",
815 constraint = tclass_datum->validatetrans;
817 if (!constraint_expr_eval(policydb, &oentry->context,
818 &nentry->context, &tentry->context,
823 rc = security_validtrans_handle_fail(state,
831 constraint = constraint->next;
839 int security_validate_transition_user(struct selinux_state *state,
840 u32 oldsid, u32 newsid, u32 tasksid,
843 return security_compute_validatetrans(state, oldsid, newsid, tasksid,
847 int security_validate_transition(struct selinux_state *state,
848 u32 oldsid, u32 newsid, u32 tasksid,
851 return security_compute_validatetrans(state, oldsid, newsid, tasksid,
856 * security_bounded_transition - check whether the given
857 * transition is directed to bounded, or not.
858 * It returns 0, if @newsid is bounded by @oldsid.
859 * Otherwise, it returns error code.
861 * @oldsid : current security identifier
862 * @newsid : destinated security identifier
864 int security_bounded_transition(struct selinux_state *state,
865 u32 old_sid, u32 new_sid)
867 struct selinux_policy *policy;
868 struct policydb *policydb;
869 struct sidtab *sidtab;
870 struct sidtab_entry *old_entry, *new_entry;
871 struct type_datum *type;
875 if (!selinux_initialized(state))
879 policy = rcu_dereference(state->policy);
880 policydb = &policy->policydb;
881 sidtab = policy->sidtab;
884 old_entry = sidtab_search_entry(sidtab, old_sid);
886 pr_err("SELinux: %s: unrecognized SID %u\n",
892 new_entry = sidtab_search_entry(sidtab, new_sid);
894 pr_err("SELinux: %s: unrecognized SID %u\n",
900 /* type/domain unchanged */
901 if (old_entry->context.type == new_entry->context.type)
904 index = new_entry->context.type;
906 type = policydb->type_val_to_struct[index - 1];
909 /* not bounded anymore */
914 /* @newsid is bounded by @oldsid */
916 if (type->bounds == old_entry->context.type)
919 index = type->bounds;
923 char *old_name = NULL;
924 char *new_name = NULL;
927 if (!sidtab_entry_to_string(policydb, sidtab, old_entry,
928 &old_name, &length) &&
929 !sidtab_entry_to_string(policydb, sidtab, new_entry,
930 &new_name, &length)) {
931 audit_log(audit_context(),
932 GFP_ATOMIC, AUDIT_SELINUX_ERR,
933 "op=security_bounded_transition "
935 "oldcontext=%s newcontext=%s",
947 static void avd_init(struct selinux_policy *policy, struct av_decision *avd)
951 avd->auditdeny = 0xffffffff;
953 avd->seqno = policy->latest_granting;
959 void services_compute_xperms_decision(struct extended_perms_decision *xpermd,
960 struct avtab_node *node)
964 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
965 if (xpermd->driver != node->datum.u.xperms->driver)
967 } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
968 if (!security_xperm_test(node->datum.u.xperms->perms.p,
975 if (node->key.specified == AVTAB_XPERMS_ALLOWED) {
976 xpermd->used |= XPERMS_ALLOWED;
977 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
978 memset(xpermd->allowed->p, 0xff,
979 sizeof(xpermd->allowed->p));
981 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
982 for (i = 0; i < ARRAY_SIZE(xpermd->allowed->p); i++)
983 xpermd->allowed->p[i] |=
984 node->datum.u.xperms->perms.p[i];
986 } else if (node->key.specified == AVTAB_XPERMS_AUDITALLOW) {
987 xpermd->used |= XPERMS_AUDITALLOW;
988 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
989 memset(xpermd->auditallow->p, 0xff,
990 sizeof(xpermd->auditallow->p));
992 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
993 for (i = 0; i < ARRAY_SIZE(xpermd->auditallow->p); i++)
994 xpermd->auditallow->p[i] |=
995 node->datum.u.xperms->perms.p[i];
997 } else if (node->key.specified == AVTAB_XPERMS_DONTAUDIT) {
998 xpermd->used |= XPERMS_DONTAUDIT;
999 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) {
1000 memset(xpermd->dontaudit->p, 0xff,
1001 sizeof(xpermd->dontaudit->p));
1003 if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) {
1004 for (i = 0; i < ARRAY_SIZE(xpermd->dontaudit->p); i++)
1005 xpermd->dontaudit->p[i] |=
1006 node->datum.u.xperms->perms.p[i];
1013 void security_compute_xperms_decision(struct selinux_state *state,
1018 struct extended_perms_decision *xpermd)
1020 struct selinux_policy *policy;
1021 struct policydb *policydb;
1022 struct sidtab *sidtab;
1024 struct context *scontext, *tcontext;
1025 struct avtab_key avkey;
1026 struct avtab_node *node;
1027 struct ebitmap *sattr, *tattr;
1028 struct ebitmap_node *snode, *tnode;
1031 xpermd->driver = driver;
1033 memset(xpermd->allowed->p, 0, sizeof(xpermd->allowed->p));
1034 memset(xpermd->auditallow->p, 0, sizeof(xpermd->auditallow->p));
1035 memset(xpermd->dontaudit->p, 0, sizeof(xpermd->dontaudit->p));
1038 if (!selinux_initialized(state))
1041 policy = rcu_dereference(state->policy);
1042 policydb = &policy->policydb;
1043 sidtab = policy->sidtab;
1045 scontext = sidtab_search(sidtab, ssid);
1047 pr_err("SELinux: %s: unrecognized SID %d\n",
1052 tcontext = sidtab_search(sidtab, tsid);
1054 pr_err("SELinux: %s: unrecognized SID %d\n",
1059 tclass = unmap_class(&policy->map, orig_tclass);
1060 if (unlikely(orig_tclass && !tclass)) {
1061 if (policydb->allow_unknown)
1067 if (unlikely(!tclass || tclass > policydb->p_classes.nprim)) {
1068 pr_warn_ratelimited("SELinux: Invalid class %hu\n", tclass);
1072 avkey.target_class = tclass;
1073 avkey.specified = AVTAB_XPERMS;
1074 sattr = &policydb->type_attr_map_array[scontext->type - 1];
1075 tattr = &policydb->type_attr_map_array[tcontext->type - 1];
1076 ebitmap_for_each_positive_bit(sattr, snode, i) {
1077 ebitmap_for_each_positive_bit(tattr, tnode, j) {
1078 avkey.source_type = i + 1;
1079 avkey.target_type = j + 1;
1080 for (node = avtab_search_node(&policydb->te_avtab,
1083 node = avtab_search_node_next(node, avkey.specified))
1084 services_compute_xperms_decision(xpermd, node);
1086 cond_compute_xperms(&policydb->te_cond_avtab,
1094 memset(xpermd->allowed->p, 0xff, sizeof(xpermd->allowed->p));
1099 * security_compute_av - Compute access vector decisions.
1100 * @ssid: source security identifier
1101 * @tsid: target security identifier
1102 * @tclass: target security class
1103 * @avd: access vector decisions
1104 * @xperms: extended permissions
1106 * Compute a set of access vector decisions based on the
1107 * SID pair (@ssid, @tsid) for the permissions in @tclass.
1109 void security_compute_av(struct selinux_state *state,
1113 struct av_decision *avd,
1114 struct extended_perms *xperms)
1116 struct selinux_policy *policy;
1117 struct policydb *policydb;
1118 struct sidtab *sidtab;
1120 struct context *scontext = NULL, *tcontext = NULL;
1123 policy = rcu_dereference(state->policy);
1124 avd_init(policy, avd);
1126 if (!selinux_initialized(state))
1129 policydb = &policy->policydb;
1130 sidtab = policy->sidtab;
1132 scontext = sidtab_search(sidtab, ssid);
1134 pr_err("SELinux: %s: unrecognized SID %d\n",
1139 /* permissive domain? */
1140 if (ebitmap_get_bit(&policydb->permissive_map, scontext->type))
1141 avd->flags |= AVD_FLAGS_PERMISSIVE;
1143 tcontext = sidtab_search(sidtab, tsid);
1145 pr_err("SELinux: %s: unrecognized SID %d\n",
1150 tclass = unmap_class(&policy->map, orig_tclass);
1151 if (unlikely(orig_tclass && !tclass)) {
1152 if (policydb->allow_unknown)
1156 context_struct_compute_av(policydb, scontext, tcontext, tclass, avd,
1158 map_decision(&policy->map, orig_tclass, avd,
1159 policydb->allow_unknown);
1164 avd->allowed = 0xffffffff;
1168 void security_compute_av_user(struct selinux_state *state,
1172 struct av_decision *avd)
1174 struct selinux_policy *policy;
1175 struct policydb *policydb;
1176 struct sidtab *sidtab;
1177 struct context *scontext = NULL, *tcontext = NULL;
1180 policy = rcu_dereference(state->policy);
1181 avd_init(policy, avd);
1182 if (!selinux_initialized(state))
1185 policydb = &policy->policydb;
1186 sidtab = policy->sidtab;
1188 scontext = sidtab_search(sidtab, ssid);
1190 pr_err("SELinux: %s: unrecognized SID %d\n",
1195 /* permissive domain? */
1196 if (ebitmap_get_bit(&policydb->permissive_map, scontext->type))
1197 avd->flags |= AVD_FLAGS_PERMISSIVE;
1199 tcontext = sidtab_search(sidtab, tsid);
1201 pr_err("SELinux: %s: unrecognized SID %d\n",
1206 if (unlikely(!tclass)) {
1207 if (policydb->allow_unknown)
1212 context_struct_compute_av(policydb, scontext, tcontext, tclass, avd,
1218 avd->allowed = 0xffffffff;
1223 * Write the security context string representation of
1224 * the context structure `context' into a dynamically
1225 * allocated string of the correct size. Set `*scontext'
1226 * to point to this string and set `*scontext_len' to
1227 * the length of the string.
1229 static int context_struct_to_string(struct policydb *p,
1230 struct context *context,
1231 char **scontext, u32 *scontext_len)
1240 *scontext_len = context->len;
1242 *scontext = kstrdup(context->str, GFP_ATOMIC);
1249 /* Compute the size of the context. */
1250 *scontext_len += strlen(sym_name(p, SYM_USERS, context->user - 1)) + 1;
1251 *scontext_len += strlen(sym_name(p, SYM_ROLES, context->role - 1)) + 1;
1252 *scontext_len += strlen(sym_name(p, SYM_TYPES, context->type - 1)) + 1;
1253 *scontext_len += mls_compute_context_len(p, context);
1258 /* Allocate space for the context; caller must free this space. */
1259 scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
1262 *scontext = scontextp;
1265 * Copy the user name, role name and type name into the context.
1267 scontextp += sprintf(scontextp, "%s:%s:%s",
1268 sym_name(p, SYM_USERS, context->user - 1),
1269 sym_name(p, SYM_ROLES, context->role - 1),
1270 sym_name(p, SYM_TYPES, context->type - 1));
1272 mls_sid_to_context(p, context, &scontextp);
1279 static int sidtab_entry_to_string(struct policydb *p,
1280 struct sidtab *sidtab,
1281 struct sidtab_entry *entry,
1282 char **scontext, u32 *scontext_len)
1284 int rc = sidtab_sid2str_get(sidtab, entry, scontext, scontext_len);
1289 rc = context_struct_to_string(p, &entry->context, scontext,
1291 if (!rc && scontext)
1292 sidtab_sid2str_put(sidtab, entry, *scontext, *scontext_len);
1296 #include "initial_sid_to_string.h"
1298 int security_sidtab_hash_stats(struct selinux_state *state, char *page)
1300 struct selinux_policy *policy;
1303 if (!selinux_initialized(state)) {
1304 pr_err("SELinux: %s: called before initial load_policy\n",
1310 policy = rcu_dereference(state->policy);
1311 rc = sidtab_hash_stats(policy->sidtab, page);
1317 const char *security_get_initial_sid_context(u32 sid)
1319 if (unlikely(sid > SECINITSID_NUM))
1321 return initial_sid_to_string[sid];
1324 static int security_sid_to_context_core(struct selinux_state *state,
1325 u32 sid, char **scontext,
1326 u32 *scontext_len, int force,
1329 struct selinux_policy *policy;
1330 struct policydb *policydb;
1331 struct sidtab *sidtab;
1332 struct sidtab_entry *entry;
1339 if (!selinux_initialized(state)) {
1340 if (sid <= SECINITSID_NUM) {
1342 const char *s = initial_sid_to_string[sid];
1346 *scontext_len = strlen(s) + 1;
1349 scontextp = kmemdup(s, *scontext_len, GFP_ATOMIC);
1352 *scontext = scontextp;
1355 pr_err("SELinux: %s: called before initial "
1356 "load_policy on unknown SID %d\n", __func__, sid);
1360 policy = rcu_dereference(state->policy);
1361 policydb = &policy->policydb;
1362 sidtab = policy->sidtab;
1365 entry = sidtab_search_entry_force(sidtab, sid);
1367 entry = sidtab_search_entry(sidtab, sid);
1369 pr_err("SELinux: %s: unrecognized SID %d\n",
1374 if (only_invalid && !entry->context.len)
1377 rc = sidtab_entry_to_string(policydb, sidtab, entry, scontext,
1387 * security_sid_to_context - Obtain a context for a given SID.
1388 * @sid: security identifier, SID
1389 * @scontext: security context
1390 * @scontext_len: length in bytes
1392 * Write the string representation of the context associated with @sid
1393 * into a dynamically allocated string of the correct size. Set @scontext
1394 * to point to this string and set @scontext_len to the length of the string.
1396 int security_sid_to_context(struct selinux_state *state,
1397 u32 sid, char **scontext, u32 *scontext_len)
1399 return security_sid_to_context_core(state, sid, scontext,
1400 scontext_len, 0, 0);
1403 int security_sid_to_context_force(struct selinux_state *state, u32 sid,
1404 char **scontext, u32 *scontext_len)
1406 return security_sid_to_context_core(state, sid, scontext,
1407 scontext_len, 1, 0);
1411 * security_sid_to_context_inval - Obtain a context for a given SID if it
1413 * @sid: security identifier, SID
1414 * @scontext: security context
1415 * @scontext_len: length in bytes
1417 * Write the string representation of the context associated with @sid
1418 * into a dynamically allocated string of the correct size, but only if the
1419 * context is invalid in the current policy. Set @scontext to point to
1420 * this string (or NULL if the context is valid) and set @scontext_len to
1421 * the length of the string (or 0 if the context is valid).
1423 int security_sid_to_context_inval(struct selinux_state *state, u32 sid,
1424 char **scontext, u32 *scontext_len)
1426 return security_sid_to_context_core(state, sid, scontext,
1427 scontext_len, 1, 1);
1431 * Caveat: Mutates scontext.
1433 static int string_to_context_struct(struct policydb *pol,
1434 struct sidtab *sidtabp,
1436 struct context *ctx,
1439 struct role_datum *role;
1440 struct type_datum *typdatum;
1441 struct user_datum *usrdatum;
1442 char *scontextp, *p, oldc;
1447 /* Parse the security context. */
1450 scontextp = (char *) scontext;
1452 /* Extract the user. */
1454 while (*p && *p != ':')
1462 usrdatum = symtab_search(&pol->p_users, scontextp);
1466 ctx->user = usrdatum->value;
1470 while (*p && *p != ':')
1478 role = symtab_search(&pol->p_roles, scontextp);
1481 ctx->role = role->value;
1485 while (*p && *p != ':')
1490 typdatum = symtab_search(&pol->p_types, scontextp);
1491 if (!typdatum || typdatum->attribute)
1494 ctx->type = typdatum->value;
1496 rc = mls_context_to_sid(pol, oldc, p, ctx, sidtabp, def_sid);
1500 /* Check the validity of the new context. */
1502 if (!policydb_context_isvalid(pol, ctx))
1507 context_destroy(ctx);
1511 static int security_context_to_sid_core(struct selinux_state *state,
1512 const char *scontext, u32 scontext_len,
1513 u32 *sid, u32 def_sid, gfp_t gfp_flags,
1516 struct selinux_policy *policy;
1517 struct policydb *policydb;
1518 struct sidtab *sidtab;
1519 char *scontext2, *str = NULL;
1520 struct context context;
1523 /* An empty security context is never valid. */
1527 /* Copy the string to allow changes and ensure a NUL terminator */
1528 scontext2 = kmemdup_nul(scontext, scontext_len, gfp_flags);
1532 if (!selinux_initialized(state)) {
1535 for (i = 1; i < SECINITSID_NUM; i++) {
1536 const char *s = initial_sid_to_string[i];
1538 if (s && !strcmp(s, scontext2)) {
1543 *sid = SECINITSID_KERNEL;
1549 /* Save another copy for storing in uninterpreted form */
1551 str = kstrdup(scontext2, gfp_flags);
1556 policy = rcu_dereference(state->policy);
1557 policydb = &policy->policydb;
1558 sidtab = policy->sidtab;
1559 rc = string_to_context_struct(policydb, sidtab, scontext2,
1561 if (rc == -EINVAL && force) {
1563 context.len = strlen(str) + 1;
1567 rc = sidtab_context_to_sid(sidtab, &context, sid);
1568 context_destroy(&context);
1578 * security_context_to_sid - Obtain a SID for a given security context.
1579 * @scontext: security context
1580 * @scontext_len: length in bytes
1581 * @sid: security identifier, SID
1582 * @gfp: context for the allocation
1584 * Obtains a SID associated with the security context that
1585 * has the string representation specified by @scontext.
1586 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
1587 * memory is available, or 0 on success.
1589 int security_context_to_sid(struct selinux_state *state,
1590 const char *scontext, u32 scontext_len, u32 *sid,
1593 return security_context_to_sid_core(state, scontext, scontext_len,
1594 sid, SECSID_NULL, gfp, 0);
1597 int security_context_str_to_sid(struct selinux_state *state,
1598 const char *scontext, u32 *sid, gfp_t gfp)
1600 return security_context_to_sid(state, scontext, strlen(scontext),
1605 * security_context_to_sid_default - Obtain a SID for a given security context,
1606 * falling back to specified default if needed.
1608 * @scontext: security context
1609 * @scontext_len: length in bytes
1610 * @sid: security identifier, SID
1611 * @def_sid: default SID to assign on error
1613 * Obtains a SID associated with the security context that
1614 * has the string representation specified by @scontext.
1615 * The default SID is passed to the MLS layer to be used to allow
1616 * kernel labeling of the MLS field if the MLS field is not present
1617 * (for upgrading to MLS without full relabel).
1618 * Implicitly forces adding of the context even if it cannot be mapped yet.
1619 * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient
1620 * memory is available, or 0 on success.
1622 int security_context_to_sid_default(struct selinux_state *state,
1623 const char *scontext, u32 scontext_len,
1624 u32 *sid, u32 def_sid, gfp_t gfp_flags)
1626 return security_context_to_sid_core(state, scontext, scontext_len,
1627 sid, def_sid, gfp_flags, 1);
1630 int security_context_to_sid_force(struct selinux_state *state,
1631 const char *scontext, u32 scontext_len,
1634 return security_context_to_sid_core(state, scontext, scontext_len,
1635 sid, SECSID_NULL, GFP_KERNEL, 1);
1638 static int compute_sid_handle_invalid_context(
1639 struct selinux_state *state,
1640 struct selinux_policy *policy,
1641 struct sidtab_entry *sentry,
1642 struct sidtab_entry *tentry,
1644 struct context *newcontext)
1646 struct policydb *policydb = &policy->policydb;
1647 struct sidtab *sidtab = policy->sidtab;
1648 char *s = NULL, *t = NULL, *n = NULL;
1649 u32 slen, tlen, nlen;
1650 struct audit_buffer *ab;
1652 if (sidtab_entry_to_string(policydb, sidtab, sentry, &s, &slen))
1654 if (sidtab_entry_to_string(policydb, sidtab, tentry, &t, &tlen))
1656 if (context_struct_to_string(policydb, newcontext, &n, &nlen))
1658 ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR);
1659 audit_log_format(ab,
1660 "op=security_compute_sid invalid_context=");
1661 /* no need to record the NUL with untrusted strings */
1662 audit_log_n_untrustedstring(ab, n, nlen - 1);
1663 audit_log_format(ab, " scontext=%s tcontext=%s tclass=%s",
1664 s, t, sym_name(policydb, SYM_CLASSES, tclass-1));
1670 if (!enforcing_enabled(state))
1675 static void filename_compute_type(struct policydb *policydb,
1676 struct context *newcontext,
1677 u32 stype, u32 ttype, u16 tclass,
1678 const char *objname)
1680 struct filename_trans_key ft;
1681 struct filename_trans_datum *datum;
1684 * Most filename trans rules are going to live in specific directories
1685 * like /dev or /var/run. This bitmap will quickly skip rule searches
1686 * if the ttype does not contain any rules.
1688 if (!ebitmap_get_bit(&policydb->filename_trans_ttypes, ttype))
1695 datum = policydb_filenametr_search(policydb, &ft);
1697 if (ebitmap_get_bit(&datum->stypes, stype - 1)) {
1698 newcontext->type = datum->otype;
1701 datum = datum->next;
1705 static int security_compute_sid(struct selinux_state *state,
1710 const char *objname,
1714 struct selinux_policy *policy;
1715 struct policydb *policydb;
1716 struct sidtab *sidtab;
1717 struct class_datum *cladatum = NULL;
1718 struct context *scontext, *tcontext, newcontext;
1719 struct sidtab_entry *sentry, *tentry;
1720 struct avtab_key avkey;
1721 struct avtab_datum *avdatum;
1722 struct avtab_node *node;
1727 if (!selinux_initialized(state)) {
1728 switch (orig_tclass) {
1729 case SECCLASS_PROCESS: /* kernel value */
1739 context_init(&newcontext);
1743 policy = rcu_dereference(state->policy);
1746 tclass = unmap_class(&policy->map, orig_tclass);
1747 sock = security_is_socket_class(orig_tclass);
1749 tclass = orig_tclass;
1750 sock = security_is_socket_class(map_class(&policy->map,
1754 policydb = &policy->policydb;
1755 sidtab = policy->sidtab;
1757 sentry = sidtab_search_entry(sidtab, ssid);
1759 pr_err("SELinux: %s: unrecognized SID %d\n",
1764 tentry = sidtab_search_entry(sidtab, tsid);
1766 pr_err("SELinux: %s: unrecognized SID %d\n",
1772 scontext = &sentry->context;
1773 tcontext = &tentry->context;
1775 if (tclass && tclass <= policydb->p_classes.nprim)
1776 cladatum = policydb->class_val_to_struct[tclass - 1];
1778 /* Set the user identity. */
1779 switch (specified) {
1780 case AVTAB_TRANSITION:
1782 if (cladatum && cladatum->default_user == DEFAULT_TARGET) {
1783 newcontext.user = tcontext->user;
1785 /* notice this gets both DEFAULT_SOURCE and unset */
1786 /* Use the process user identity. */
1787 newcontext.user = scontext->user;
1791 /* Use the related object owner. */
1792 newcontext.user = tcontext->user;
1796 /* Set the role to default values. */
1797 if (cladatum && cladatum->default_role == DEFAULT_SOURCE) {
1798 newcontext.role = scontext->role;
1799 } else if (cladatum && cladatum->default_role == DEFAULT_TARGET) {
1800 newcontext.role = tcontext->role;
1802 if ((tclass == policydb->process_class) || sock)
1803 newcontext.role = scontext->role;
1805 newcontext.role = OBJECT_R_VAL;
1808 /* Set the type to default values. */
1809 if (cladatum && cladatum->default_type == DEFAULT_SOURCE) {
1810 newcontext.type = scontext->type;
1811 } else if (cladatum && cladatum->default_type == DEFAULT_TARGET) {
1812 newcontext.type = tcontext->type;
1814 if ((tclass == policydb->process_class) || sock) {
1815 /* Use the type of process. */
1816 newcontext.type = scontext->type;
1818 /* Use the type of the related object. */
1819 newcontext.type = tcontext->type;
1823 /* Look for a type transition/member/change rule. */
1824 avkey.source_type = scontext->type;
1825 avkey.target_type = tcontext->type;
1826 avkey.target_class = tclass;
1827 avkey.specified = specified;
1828 avdatum = avtab_search(&policydb->te_avtab, &avkey);
1830 /* If no permanent rule, also check for enabled conditional rules */
1832 node = avtab_search_node(&policydb->te_cond_avtab, &avkey);
1833 for (; node; node = avtab_search_node_next(node, specified)) {
1834 if (node->key.specified & AVTAB_ENABLED) {
1835 avdatum = &node->datum;
1842 /* Use the type from the type transition/member/change rule. */
1843 newcontext.type = avdatum->u.data;
1846 /* if we have a objname this is a file trans check so check those rules */
1848 filename_compute_type(policydb, &newcontext, scontext->type,
1849 tcontext->type, tclass, objname);
1851 /* Check for class-specific changes. */
1852 if (specified & AVTAB_TRANSITION) {
1853 /* Look for a role transition rule. */
1854 struct role_trans_datum *rtd;
1855 struct role_trans_key rtk = {
1856 .role = scontext->role,
1857 .type = tcontext->type,
1861 rtd = policydb_roletr_search(policydb, &rtk);
1863 newcontext.role = rtd->new_role;
1866 /* Set the MLS attributes.
1867 This is done last because it may allocate memory. */
1868 rc = mls_compute_sid(policydb, scontext, tcontext, tclass, specified,
1873 /* Check the validity of the context. */
1874 if (!policydb_context_isvalid(policydb, &newcontext)) {
1875 rc = compute_sid_handle_invalid_context(state, policy, sentry,
1881 /* Obtain the sid for the context. */
1882 rc = sidtab_context_to_sid(sidtab, &newcontext, out_sid);
1885 context_destroy(&newcontext);
1891 * security_transition_sid - Compute the SID for a new subject/object.
1892 * @ssid: source security identifier
1893 * @tsid: target security identifier
1894 * @tclass: target security class
1895 * @out_sid: security identifier for new subject/object
1897 * Compute a SID to use for labeling a new subject or object in the
1898 * class @tclass based on a SID pair (@ssid, @tsid).
1899 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1900 * if insufficient memory is available, or %0 if the new SID was
1901 * computed successfully.
1903 int security_transition_sid(struct selinux_state *state,
1904 u32 ssid, u32 tsid, u16 tclass,
1905 const struct qstr *qstr, u32 *out_sid)
1907 return security_compute_sid(state, ssid, tsid, tclass,
1909 qstr ? qstr->name : NULL, out_sid, true);
1912 int security_transition_sid_user(struct selinux_state *state,
1913 u32 ssid, u32 tsid, u16 tclass,
1914 const char *objname, u32 *out_sid)
1916 return security_compute_sid(state, ssid, tsid, tclass,
1918 objname, out_sid, false);
1922 * security_member_sid - Compute the SID for member selection.
1923 * @ssid: source security identifier
1924 * @tsid: target security identifier
1925 * @tclass: target security class
1926 * @out_sid: security identifier for selected member
1928 * Compute a SID to use when selecting a member of a polyinstantiated
1929 * object of class @tclass based on a SID pair (@ssid, @tsid).
1930 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1931 * if insufficient memory is available, or %0 if the SID was
1932 * computed successfully.
1934 int security_member_sid(struct selinux_state *state,
1940 return security_compute_sid(state, ssid, tsid, tclass,
1946 * security_change_sid - Compute the SID for object relabeling.
1947 * @ssid: source security identifier
1948 * @tsid: target security identifier
1949 * @tclass: target security class
1950 * @out_sid: security identifier for selected member
1952 * Compute a SID to use for relabeling an object of class @tclass
1953 * based on a SID pair (@ssid, @tsid).
1954 * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM
1955 * if insufficient memory is available, or %0 if the SID was
1956 * computed successfully.
1958 int security_change_sid(struct selinux_state *state,
1964 return security_compute_sid(state,
1965 ssid, tsid, tclass, AVTAB_CHANGE, NULL,
1969 static inline int convert_context_handle_invalid_context(
1970 struct selinux_state *state,
1971 struct policydb *policydb,
1972 struct context *context)
1977 if (enforcing_enabled(state))
1980 if (!context_struct_to_string(policydb, context, &s, &len)) {
1981 pr_warn("SELinux: Context %s would be invalid if enforcing\n",
1989 * Convert the values in the security context
1990 * structure `oldc' from the values specified
1991 * in the policy `p->oldp' to the values specified
1992 * in the policy `p->newp', storing the new context
1993 * in `newc'. Verify that the context is valid
1994 * under the new policy.
1996 static int convert_context(struct context *oldc, struct context *newc, void *p)
1998 struct convert_context_args *args;
1999 struct ocontext *oc;
2000 struct role_datum *role;
2001 struct type_datum *typdatum;
2002 struct user_datum *usrdatum;
2010 s = kstrdup(oldc->str, GFP_KERNEL);
2014 rc = string_to_context_struct(args->newp, NULL, s,
2016 if (rc == -EINVAL) {
2018 * Retain string representation for later mapping.
2020 * IMPORTANT: We need to copy the contents of oldc->str
2021 * back into s again because string_to_context_struct()
2022 * may have garbled it.
2024 memcpy(s, oldc->str, oldc->len);
2027 newc->len = oldc->len;
2032 /* Other error condition, e.g. ENOMEM. */
2033 pr_err("SELinux: Unable to map context %s, rc = %d.\n",
2037 pr_info("SELinux: Context %s became valid (mapped).\n",
2044 /* Convert the user. */
2046 usrdatum = symtab_search(&args->newp->p_users,
2047 sym_name(args->oldp,
2048 SYM_USERS, oldc->user - 1));
2051 newc->user = usrdatum->value;
2053 /* Convert the role. */
2055 role = symtab_search(&args->newp->p_roles,
2056 sym_name(args->oldp, SYM_ROLES, oldc->role - 1));
2059 newc->role = role->value;
2061 /* Convert the type. */
2063 typdatum = symtab_search(&args->newp->p_types,
2064 sym_name(args->oldp,
2065 SYM_TYPES, oldc->type - 1));
2068 newc->type = typdatum->value;
2070 /* Convert the MLS fields if dealing with MLS policies */
2071 if (args->oldp->mls_enabled && args->newp->mls_enabled) {
2072 rc = mls_convert_context(args->oldp, args->newp, oldc, newc);
2075 } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) {
2077 * Switching between non-MLS and MLS policy:
2078 * ensure that the MLS fields of the context for all
2079 * existing entries in the sidtab are filled in with a
2080 * suitable default value, likely taken from one of the
2083 oc = args->newp->ocontexts[OCON_ISID];
2084 while (oc && oc->sid[0] != SECINITSID_UNLABELED)
2088 pr_err("SELinux: unable to look up"
2089 " the initial SIDs list\n");
2092 rc = mls_range_set(newc, &oc->context[0].range);
2097 /* Check the validity of the new context. */
2098 if (!policydb_context_isvalid(args->newp, newc)) {
2099 rc = convert_context_handle_invalid_context(args->state,
2108 /* Map old representation to string and save it. */
2109 rc = context_struct_to_string(args->oldp, oldc, &s, &len);
2112 context_destroy(newc);
2115 pr_info("SELinux: Context %s became invalid (unmapped).\n",
2120 static void security_load_policycaps(struct selinux_state *state,
2121 struct selinux_policy *policy)
2125 struct ebitmap_node *node;
2127 p = &policy->policydb;
2129 for (i = 0; i < ARRAY_SIZE(state->policycap); i++)
2130 WRITE_ONCE(state->policycap[i],
2131 ebitmap_get_bit(&p->policycaps, i));
2133 for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++)
2134 pr_info("SELinux: policy capability %s=%d\n",
2135 selinux_policycap_names[i],
2136 ebitmap_get_bit(&p->policycaps, i));
2138 ebitmap_for_each_positive_bit(&p->policycaps, node, i) {
2139 if (i >= ARRAY_SIZE(selinux_policycap_names))
2140 pr_info("SELinux: unknown policy capability %u\n",
2145 static int security_preserve_bools(struct selinux_policy *oldpolicy,
2146 struct selinux_policy *newpolicy);
2148 static void selinux_policy_free(struct selinux_policy *policy)
2153 sidtab_destroy(policy->sidtab);
2154 kfree(policy->map.mapping);
2155 policydb_destroy(&policy->policydb);
2156 kfree(policy->sidtab);
2160 static void selinux_policy_cond_free(struct selinux_policy *policy)
2162 cond_policydb_destroy_dup(&policy->policydb);
2166 void selinux_policy_cancel(struct selinux_state *state,
2167 struct selinux_load_state *load_state)
2169 struct selinux_policy *oldpolicy;
2171 oldpolicy = rcu_dereference_protected(state->policy,
2172 lockdep_is_held(&state->policy_mutex));
2174 sidtab_cancel_convert(oldpolicy->sidtab);
2175 selinux_policy_free(load_state->policy);
2176 kfree(load_state->convert_data);
2179 static void selinux_notify_policy_change(struct selinux_state *state,
2182 /* Flush external caches and notify userspace of policy load */
2183 avc_ss_reset(state->avc, seqno);
2184 selnl_notify_policyload(seqno);
2185 selinux_status_update_policyload(state, seqno);
2186 selinux_netlbl_cache_invalidate();
2187 selinux_xfrm_notify_policyload();
2188 selinux_ima_measure_state(state);
2191 void selinux_policy_commit(struct selinux_state *state,
2192 struct selinux_load_state *load_state)
2194 struct selinux_policy *oldpolicy, *newpolicy = load_state->policy;
2197 oldpolicy = rcu_dereference_protected(state->policy,
2198 lockdep_is_held(&state->policy_mutex));
2200 /* If switching between different policy types, log MLS status */
2202 if (oldpolicy->policydb.mls_enabled && !newpolicy->policydb.mls_enabled)
2203 pr_info("SELinux: Disabling MLS support...\n");
2204 else if (!oldpolicy->policydb.mls_enabled && newpolicy->policydb.mls_enabled)
2205 pr_info("SELinux: Enabling MLS support...\n");
2208 /* Set latest granting seqno for new policy. */
2210 newpolicy->latest_granting = oldpolicy->latest_granting + 1;
2212 newpolicy->latest_granting = 1;
2213 seqno = newpolicy->latest_granting;
2215 /* Install the new policy. */
2216 rcu_assign_pointer(state->policy, newpolicy);
2218 /* Load the policycaps from the new policy */
2219 security_load_policycaps(state, newpolicy);
2221 if (!selinux_initialized(state)) {
2223 * After first policy load, the security server is
2224 * marked as initialized and ready to handle requests and
2225 * any objects created prior to policy load are then labeled.
2227 selinux_mark_initialized(state);
2228 selinux_complete_init();
2231 /* Free the old policy */
2233 selinux_policy_free(oldpolicy);
2234 kfree(load_state->convert_data);
2236 /* Notify others of the policy change */
2237 selinux_notify_policy_change(state, seqno);
2241 * security_load_policy - Load a security policy configuration.
2242 * @data: binary policy data
2243 * @len: length of data in bytes
2245 * Load a new set of security policy configuration data,
2246 * validate it and convert the SID table as necessary.
2247 * This function will flush the access vector cache after
2248 * loading the new policy.
2250 int security_load_policy(struct selinux_state *state, void *data, size_t len,
2251 struct selinux_load_state *load_state)
2253 struct selinux_policy *newpolicy, *oldpolicy;
2254 struct selinux_policy_convert_data *convert_data;
2256 struct policy_file file = { data, len }, *fp = &file;
2258 newpolicy = kzalloc(sizeof(*newpolicy), GFP_KERNEL);
2262 newpolicy->sidtab = kzalloc(sizeof(*newpolicy->sidtab), GFP_KERNEL);
2263 if (!newpolicy->sidtab) {
2268 rc = policydb_read(&newpolicy->policydb, fp);
2272 newpolicy->policydb.len = len;
2273 rc = selinux_set_mapping(&newpolicy->policydb, secclass_map,
2278 rc = policydb_load_isids(&newpolicy->policydb, newpolicy->sidtab);
2280 pr_err("SELinux: unable to load the initial SIDs\n");
2284 if (!selinux_initialized(state)) {
2285 /* First policy load, so no need to preserve state from old policy */
2286 load_state->policy = newpolicy;
2287 load_state->convert_data = NULL;
2291 oldpolicy = rcu_dereference_protected(state->policy,
2292 lockdep_is_held(&state->policy_mutex));
2294 /* Preserve active boolean values from the old policy */
2295 rc = security_preserve_bools(oldpolicy, newpolicy);
2297 pr_err("SELinux: unable to preserve booleans\n");
2298 goto err_free_isids;
2301 convert_data = kmalloc(sizeof(*convert_data), GFP_KERNEL);
2302 if (!convert_data) {
2304 goto err_free_isids;
2308 * Convert the internal representations of contexts
2309 * in the new SID table.
2311 convert_data->args.state = state;
2312 convert_data->args.oldp = &oldpolicy->policydb;
2313 convert_data->args.newp = &newpolicy->policydb;
2315 convert_data->sidtab_params.func = convert_context;
2316 convert_data->sidtab_params.args = &convert_data->args;
2317 convert_data->sidtab_params.target = newpolicy->sidtab;
2319 rc = sidtab_convert(oldpolicy->sidtab, &convert_data->sidtab_params);
2321 pr_err("SELinux: unable to convert the internal"
2322 " representation of contexts in the new SID"
2324 goto err_free_convert_data;
2327 load_state->policy = newpolicy;
2328 load_state->convert_data = convert_data;
2331 err_free_convert_data:
2332 kfree(convert_data);
2334 sidtab_destroy(newpolicy->sidtab);
2336 kfree(newpolicy->map.mapping);
2338 policydb_destroy(&newpolicy->policydb);
2340 kfree(newpolicy->sidtab);
2348 * security_port_sid - Obtain the SID for a port.
2349 * @protocol: protocol number
2350 * @port: port number
2351 * @out_sid: security identifier
2353 int security_port_sid(struct selinux_state *state,
2354 u8 protocol, u16 port, u32 *out_sid)
2356 struct selinux_policy *policy;
2357 struct policydb *policydb;
2358 struct sidtab *sidtab;
2362 if (!selinux_initialized(state)) {
2363 *out_sid = SECINITSID_PORT;
2368 policy = rcu_dereference(state->policy);
2369 policydb = &policy->policydb;
2370 sidtab = policy->sidtab;
2372 c = policydb->ocontexts[OCON_PORT];
2374 if (c->u.port.protocol == protocol &&
2375 c->u.port.low_port <= port &&
2376 c->u.port.high_port >= port)
2383 rc = sidtab_context_to_sid(sidtab, &c->context[0],
2388 *out_sid = c->sid[0];
2390 *out_sid = SECINITSID_PORT;
2399 * security_pkey_sid - Obtain the SID for a pkey.
2400 * @subnet_prefix: Subnet Prefix
2401 * @pkey_num: pkey number
2402 * @out_sid: security identifier
2404 int security_ib_pkey_sid(struct selinux_state *state,
2405 u64 subnet_prefix, u16 pkey_num, u32 *out_sid)
2407 struct selinux_policy *policy;
2408 struct policydb *policydb;
2409 struct sidtab *sidtab;
2413 if (!selinux_initialized(state)) {
2414 *out_sid = SECINITSID_UNLABELED;
2419 policy = rcu_dereference(state->policy);
2420 policydb = &policy->policydb;
2421 sidtab = policy->sidtab;
2423 c = policydb->ocontexts[OCON_IBPKEY];
2425 if (c->u.ibpkey.low_pkey <= pkey_num &&
2426 c->u.ibpkey.high_pkey >= pkey_num &&
2427 c->u.ibpkey.subnet_prefix == subnet_prefix)
2435 rc = sidtab_context_to_sid(sidtab,
2441 *out_sid = c->sid[0];
2443 *out_sid = SECINITSID_UNLABELED;
2451 * security_ib_endport_sid - Obtain the SID for a subnet management interface.
2452 * @dev_name: device name
2453 * @port: port number
2454 * @out_sid: security identifier
2456 int security_ib_endport_sid(struct selinux_state *state,
2457 const char *dev_name, u8 port_num, u32 *out_sid)
2459 struct selinux_policy *policy;
2460 struct policydb *policydb;
2461 struct sidtab *sidtab;
2465 if (!selinux_initialized(state)) {
2466 *out_sid = SECINITSID_UNLABELED;
2471 policy = rcu_dereference(state->policy);
2472 policydb = &policy->policydb;
2473 sidtab = policy->sidtab;
2475 c = policydb->ocontexts[OCON_IBENDPORT];
2477 if (c->u.ibendport.port == port_num &&
2478 !strncmp(c->u.ibendport.dev_name,
2480 IB_DEVICE_NAME_MAX))
2488 rc = sidtab_context_to_sid(sidtab, &c->context[0],
2493 *out_sid = c->sid[0];
2495 *out_sid = SECINITSID_UNLABELED;
2503 * security_netif_sid - Obtain the SID for a network interface.
2504 * @name: interface name
2505 * @if_sid: interface SID
2507 int security_netif_sid(struct selinux_state *state,
2508 char *name, u32 *if_sid)
2510 struct selinux_policy *policy;
2511 struct policydb *policydb;
2512 struct sidtab *sidtab;
2516 if (!selinux_initialized(state)) {
2517 *if_sid = SECINITSID_NETIF;
2522 policy = rcu_dereference(state->policy);
2523 policydb = &policy->policydb;
2524 sidtab = policy->sidtab;
2526 c = policydb->ocontexts[OCON_NETIF];
2528 if (strcmp(name, c->u.name) == 0)
2534 if (!c->sid[0] || !c->sid[1]) {
2535 rc = sidtab_context_to_sid(sidtab, &c->context[0],
2539 rc = sidtab_context_to_sid(sidtab, &c->context[1],
2544 *if_sid = c->sid[0];
2546 *if_sid = SECINITSID_NETIF;
2553 static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
2557 for (i = 0; i < 4; i++)
2558 if (addr[i] != (input[i] & mask[i])) {
2567 * security_node_sid - Obtain the SID for a node (host).
2568 * @domain: communication domain aka address family
2570 * @addrlen: address length in bytes
2571 * @out_sid: security identifier
2573 int security_node_sid(struct selinux_state *state,
2579 struct selinux_policy *policy;
2580 struct policydb *policydb;
2581 struct sidtab *sidtab;
2585 if (!selinux_initialized(state)) {
2586 *out_sid = SECINITSID_NODE;
2591 policy = rcu_dereference(state->policy);
2592 policydb = &policy->policydb;
2593 sidtab = policy->sidtab;
2600 if (addrlen != sizeof(u32))
2603 addr = *((u32 *)addrp);
2605 c = policydb->ocontexts[OCON_NODE];
2607 if (c->u.node.addr == (addr & c->u.node.mask))
2616 if (addrlen != sizeof(u64) * 2)
2618 c = policydb->ocontexts[OCON_NODE6];
2620 if (match_ipv6_addrmask(addrp, c->u.node6.addr,
2629 *out_sid = SECINITSID_NODE;
2635 rc = sidtab_context_to_sid(sidtab,
2641 *out_sid = c->sid[0];
2643 *out_sid = SECINITSID_NODE;
2655 * security_get_user_sids - Obtain reachable SIDs for a user.
2656 * @fromsid: starting SID
2657 * @username: username
2658 * @sids: array of reachable SIDs for user
2659 * @nel: number of elements in @sids
2661 * Generate the set of SIDs for legal security contexts
2662 * for a given user that can be reached by @fromsid.
2663 * Set *@sids to point to a dynamically allocated
2664 * array containing the set of SIDs. Set *@nel to the
2665 * number of elements in the array.
2668 int security_get_user_sids(struct selinux_state *state,
2674 struct selinux_policy *policy;
2675 struct policydb *policydb;
2676 struct sidtab *sidtab;
2677 struct context *fromcon, usercon;
2678 u32 *mysids = NULL, *mysids2, sid;
2679 u32 mynel = 0, maxnel = SIDS_NEL;
2680 struct user_datum *user;
2681 struct role_datum *role;
2682 struct ebitmap_node *rnode, *tnode;
2688 if (!selinux_initialized(state))
2692 policy = rcu_dereference(state->policy);
2693 policydb = &policy->policydb;
2694 sidtab = policy->sidtab;
2696 context_init(&usercon);
2699 fromcon = sidtab_search(sidtab, fromsid);
2704 user = symtab_search(&policydb->p_users, username);
2708 usercon.user = user->value;
2711 mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC);
2715 ebitmap_for_each_positive_bit(&user->roles, rnode, i) {
2716 role = policydb->role_val_to_struct[i];
2717 usercon.role = i + 1;
2718 ebitmap_for_each_positive_bit(&role->types, tnode, j) {
2719 usercon.type = j + 1;
2721 if (mls_setup_user_range(policydb, fromcon, user,
2725 rc = sidtab_context_to_sid(sidtab, &usercon, &sid);
2728 if (mynel < maxnel) {
2729 mysids[mynel++] = sid;
2733 mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
2736 memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
2739 mysids[mynel++] = sid;
2752 mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL);
2757 for (i = 0, j = 0; i < mynel; i++) {
2758 struct av_decision dummy_avd;
2759 rc = avc_has_perm_noaudit(state,
2761 SECCLASS_PROCESS, /* kernel value */
2762 PROCESS__TRANSITION, AVC_STRICT,
2765 mysids2[j++] = mysids[i];
2777 * __security_genfs_sid - Helper to obtain a SID for a file in a filesystem
2778 * @fstype: filesystem type
2779 * @path: path from root of mount
2780 * @sclass: file security class
2781 * @sid: SID for path
2783 * Obtain a SID to use for a file in a filesystem that
2784 * cannot support xattr or use a fixed labeling behavior like
2785 * transition SIDs or task SIDs.
2787 static inline int __security_genfs_sid(struct selinux_policy *policy,
2793 struct policydb *policydb = &policy->policydb;
2794 struct sidtab *sidtab = policy->sidtab;
2797 struct genfs *genfs;
2801 while (path[0] == '/' && path[1] == '/')
2804 sclass = unmap_class(&policy->map, orig_sclass);
2805 *sid = SECINITSID_UNLABELED;
2807 for (genfs = policydb->genfs; genfs; genfs = genfs->next) {
2808 cmp = strcmp(fstype, genfs->fstype);
2817 for (c = genfs->head; c; c = c->next) {
2818 len = strlen(c->u.name);
2819 if ((!c->v.sclass || sclass == c->v.sclass) &&
2820 (strncmp(c->u.name, path, len) == 0))
2829 rc = sidtab_context_to_sid(sidtab, &c->context[0], &c->sid[0]);
2841 * security_genfs_sid - Obtain a SID for a file in a filesystem
2842 * @fstype: filesystem type
2843 * @path: path from root of mount
2844 * @sclass: file security class
2845 * @sid: SID for path
2847 * Acquire policy_rwlock before calling __security_genfs_sid() and release
2850 int security_genfs_sid(struct selinux_state *state,
2856 struct selinux_policy *policy;
2859 if (!selinux_initialized(state)) {
2860 *sid = SECINITSID_UNLABELED;
2865 policy = rcu_dereference(state->policy);
2866 retval = __security_genfs_sid(policy,
2867 fstype, path, orig_sclass, sid);
2872 int selinux_policy_genfs_sid(struct selinux_policy *policy,
2878 /* no lock required, policy is not yet accessible by other threads */
2879 return __security_genfs_sid(policy, fstype, path, orig_sclass, sid);
2883 * security_fs_use - Determine how to handle labeling for a filesystem.
2884 * @sb: superblock in question
2886 int security_fs_use(struct selinux_state *state, struct super_block *sb)
2888 struct selinux_policy *policy;
2889 struct policydb *policydb;
2890 struct sidtab *sidtab;
2893 struct superblock_security_struct *sbsec = sb->s_security;
2894 const char *fstype = sb->s_type->name;
2896 if (!selinux_initialized(state)) {
2897 sbsec->behavior = SECURITY_FS_USE_NONE;
2898 sbsec->sid = SECINITSID_UNLABELED;
2903 policy = rcu_dereference(state->policy);
2904 policydb = &policy->policydb;
2905 sidtab = policy->sidtab;
2907 c = policydb->ocontexts[OCON_FSUSE];
2909 if (strcmp(fstype, c->u.name) == 0)
2915 sbsec->behavior = c->v.behavior;
2917 rc = sidtab_context_to_sid(sidtab, &c->context[0],
2922 sbsec->sid = c->sid[0];
2924 rc = __security_genfs_sid(policy, fstype, "/",
2925 SECCLASS_DIR, &sbsec->sid);
2927 sbsec->behavior = SECURITY_FS_USE_NONE;
2930 sbsec->behavior = SECURITY_FS_USE_GENFS;
2939 int security_get_bools(struct selinux_policy *policy,
2940 u32 *len, char ***names, int **values)
2942 struct policydb *policydb;
2946 policydb = &policy->policydb;
2952 *len = policydb->p_bools.nprim;
2957 *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC);
2962 *values = kcalloc(*len, sizeof(int), GFP_ATOMIC);
2966 for (i = 0; i < *len; i++) {
2967 (*values)[i] = policydb->bool_val_to_struct[i]->state;
2970 (*names)[i] = kstrdup(sym_name(policydb, SYM_BOOLS, i),
2980 for (i = 0; i < *len; i++)
2992 int security_set_bools(struct selinux_state *state, u32 len, int *values)
2994 struct selinux_policy *newpolicy, *oldpolicy;
2998 if (!selinux_initialized(state))
3001 oldpolicy = rcu_dereference_protected(state->policy,
3002 lockdep_is_held(&state->policy_mutex));
3004 /* Consistency check on number of booleans, should never fail */
3005 if (WARN_ON(len != oldpolicy->policydb.p_bools.nprim))
3008 newpolicy = kmemdup(oldpolicy, sizeof(*newpolicy), GFP_KERNEL);
3013 * Deep copy only the parts of the policydb that might be
3014 * modified as a result of changing booleans.
3016 rc = cond_policydb_dup(&newpolicy->policydb, &oldpolicy->policydb);
3022 /* Update the boolean states in the copy */
3023 for (i = 0; i < len; i++) {
3024 int new_state = !!values[i];
3025 int old_state = newpolicy->policydb.bool_val_to_struct[i]->state;
3027 if (new_state != old_state) {
3028 audit_log(audit_context(), GFP_ATOMIC,
3029 AUDIT_MAC_CONFIG_CHANGE,
3030 "bool=%s val=%d old_val=%d auid=%u ses=%u",
3031 sym_name(&newpolicy->policydb, SYM_BOOLS, i),
3034 from_kuid(&init_user_ns, audit_get_loginuid(current)),
3035 audit_get_sessionid(current));
3036 newpolicy->policydb.bool_val_to_struct[i]->state = new_state;
3040 /* Re-evaluate the conditional rules in the copy */
3041 evaluate_cond_nodes(&newpolicy->policydb);
3043 /* Set latest granting seqno for new policy */
3044 newpolicy->latest_granting = oldpolicy->latest_granting + 1;
3045 seqno = newpolicy->latest_granting;
3047 /* Install the new policy */
3048 rcu_assign_pointer(state->policy, newpolicy);
3051 * Free the conditional portions of the old policydb
3052 * that were copied for the new policy, and the oldpolicy
3053 * structure itself but not what it references.
3056 selinux_policy_cond_free(oldpolicy);
3058 /* Notify others of the policy change */
3059 selinux_notify_policy_change(state, seqno);
3063 int security_get_bool_value(struct selinux_state *state,
3066 struct selinux_policy *policy;
3067 struct policydb *policydb;
3071 if (!selinux_initialized(state))
3075 policy = rcu_dereference(state->policy);
3076 policydb = &policy->policydb;
3079 len = policydb->p_bools.nprim;
3083 rc = policydb->bool_val_to_struct[index]->state;
3089 static int security_preserve_bools(struct selinux_policy *oldpolicy,
3090 struct selinux_policy *newpolicy)
3092 int rc, *bvalues = NULL;
3093 char **bnames = NULL;
3094 struct cond_bool_datum *booldatum;
3097 rc = security_get_bools(oldpolicy, &nbools, &bnames, &bvalues);
3100 for (i = 0; i < nbools; i++) {
3101 booldatum = symtab_search(&newpolicy->policydb.p_bools,
3104 booldatum->state = bvalues[i];
3106 evaluate_cond_nodes(&newpolicy->policydb);
3110 for (i = 0; i < nbools; i++)
3119 * security_sid_mls_copy() - computes a new sid based on the given
3120 * sid and the mls portion of mls_sid.
3122 int security_sid_mls_copy(struct selinux_state *state,
3123 u32 sid, u32 mls_sid, u32 *new_sid)
3125 struct selinux_policy *policy;
3126 struct policydb *policydb;
3127 struct sidtab *sidtab;
3128 struct context *context1;
3129 struct context *context2;
3130 struct context newcon;
3136 if (!selinux_initialized(state)) {
3141 context_init(&newcon);
3144 policy = rcu_dereference(state->policy);
3145 policydb = &policy->policydb;
3146 sidtab = policy->sidtab;
3148 if (!policydb->mls_enabled) {
3154 context1 = sidtab_search(sidtab, sid);
3156 pr_err("SELinux: %s: unrecognized SID %d\n",
3162 context2 = sidtab_search(sidtab, mls_sid);
3164 pr_err("SELinux: %s: unrecognized SID %d\n",
3169 newcon.user = context1->user;
3170 newcon.role = context1->role;
3171 newcon.type = context1->type;
3172 rc = mls_context_cpy(&newcon, context2);
3176 /* Check the validity of the new context. */
3177 if (!policydb_context_isvalid(policydb, &newcon)) {
3178 rc = convert_context_handle_invalid_context(state, policydb,
3181 if (!context_struct_to_string(policydb, &newcon, &s,
3183 struct audit_buffer *ab;
3185 ab = audit_log_start(audit_context(),
3188 audit_log_format(ab,
3189 "op=security_sid_mls_copy invalid_context=");
3190 /* don't record NUL with untrusted strings */
3191 audit_log_n_untrustedstring(ab, s, len - 1);
3198 rc = sidtab_context_to_sid(sidtab, &newcon, new_sid);
3201 context_destroy(&newcon);
3207 * security_net_peersid_resolve - Compare and resolve two network peer SIDs
3208 * @nlbl_sid: NetLabel SID
3209 * @nlbl_type: NetLabel labeling protocol type
3210 * @xfrm_sid: XFRM SID
3213 * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be
3214 * resolved into a single SID it is returned via @peer_sid and the function
3215 * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function
3216 * returns a negative value. A table summarizing the behavior is below:
3218 * | function return | @sid
3219 * ------------------------------+-----------------+-----------------
3220 * no peer labels | 0 | SECSID_NULL
3221 * single peer label | 0 | <peer_label>
3222 * multiple, consistent labels | 0 | <peer_label>
3223 * multiple, inconsistent labels | -<errno> | SECSID_NULL
3226 int security_net_peersid_resolve(struct selinux_state *state,
3227 u32 nlbl_sid, u32 nlbl_type,
3231 struct selinux_policy *policy;
3232 struct policydb *policydb;
3233 struct sidtab *sidtab;
3235 struct context *nlbl_ctx;
3236 struct context *xfrm_ctx;
3238 *peer_sid = SECSID_NULL;
3240 /* handle the common (which also happens to be the set of easy) cases
3241 * right away, these two if statements catch everything involving a
3242 * single or absent peer SID/label */
3243 if (xfrm_sid == SECSID_NULL) {
3244 *peer_sid = nlbl_sid;
3247 /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label
3248 * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label
3250 if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) {
3251 *peer_sid = xfrm_sid;
3255 if (!selinux_initialized(state))
3259 policy = rcu_dereference(state->policy);
3260 policydb = &policy->policydb;
3261 sidtab = policy->sidtab;
3264 * We don't need to check initialized here since the only way both
3265 * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the
3266 * security server was initialized and state->initialized was true.
3268 if (!policydb->mls_enabled) {
3274 nlbl_ctx = sidtab_search(sidtab, nlbl_sid);
3276 pr_err("SELinux: %s: unrecognized SID %d\n",
3277 __func__, nlbl_sid);
3281 xfrm_ctx = sidtab_search(sidtab, xfrm_sid);
3283 pr_err("SELinux: %s: unrecognized SID %d\n",
3284 __func__, xfrm_sid);
3287 rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES);
3291 /* at present NetLabel SIDs/labels really only carry MLS
3292 * information so if the MLS portion of the NetLabel SID
3293 * matches the MLS portion of the labeled XFRM SID/label
3294 * then pass along the XFRM SID as it is the most
3296 *peer_sid = xfrm_sid;
3302 static int get_classes_callback(void *k, void *d, void *args)
3304 struct class_datum *datum = d;
3305 char *name = k, **classes = args;
3306 int value = datum->value - 1;
3308 classes[value] = kstrdup(name, GFP_ATOMIC);
3309 if (!classes[value])
3315 int security_get_classes(struct selinux_policy *policy,
3316 char ***classes, int *nclasses)
3318 struct policydb *policydb;
3321 policydb = &policy->policydb;
3324 *nclasses = policydb->p_classes.nprim;
3325 *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC);
3329 rc = hashtab_map(&policydb->p_classes.table, get_classes_callback,
3333 for (i = 0; i < *nclasses; i++)
3334 kfree((*classes)[i]);
3342 static int get_permissions_callback(void *k, void *d, void *args)
3344 struct perm_datum *datum = d;
3345 char *name = k, **perms = args;
3346 int value = datum->value - 1;
3348 perms[value] = kstrdup(name, GFP_ATOMIC);
3355 int security_get_permissions(struct selinux_policy *policy,
3356 char *class, char ***perms, int *nperms)
3358 struct policydb *policydb;
3360 struct class_datum *match;
3362 policydb = &policy->policydb;
3365 match = symtab_search(&policydb->p_classes, class);
3367 pr_err("SELinux: %s: unrecognized class %s\n",
3373 *nperms = match->permissions.nprim;
3374 *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC);
3378 if (match->comdatum) {
3379 rc = hashtab_map(&match->comdatum->permissions.table,
3380 get_permissions_callback, *perms);
3385 rc = hashtab_map(&match->permissions.table, get_permissions_callback,
3394 for (i = 0; i < *nperms; i++)
3400 int security_get_reject_unknown(struct selinux_state *state)
3402 struct selinux_policy *policy;
3405 if (!selinux_initialized(state))
3409 policy = rcu_dereference(state->policy);
3410 value = policy->policydb.reject_unknown;
3415 int security_get_allow_unknown(struct selinux_state *state)
3417 struct selinux_policy *policy;
3420 if (!selinux_initialized(state))
3424 policy = rcu_dereference(state->policy);
3425 value = policy->policydb.allow_unknown;
3431 * security_policycap_supported - Check for a specific policy capability
3432 * @req_cap: capability
3435 * This function queries the currently loaded policy to see if it supports the
3436 * capability specified by @req_cap. Returns true (1) if the capability is
3437 * supported, false (0) if it isn't supported.
3440 int security_policycap_supported(struct selinux_state *state,
3441 unsigned int req_cap)
3443 struct selinux_policy *policy;
3446 if (!selinux_initialized(state))
3450 policy = rcu_dereference(state->policy);
3451 rc = ebitmap_get_bit(&policy->policydb.policycaps, req_cap);
3457 struct selinux_audit_rule {
3459 struct context au_ctxt;
3462 void selinux_audit_rule_free(void *vrule)
3464 struct selinux_audit_rule *rule = vrule;
3467 context_destroy(&rule->au_ctxt);
3472 int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
3474 struct selinux_state *state = &selinux_state;
3475 struct selinux_policy *policy;
3476 struct policydb *policydb;
3477 struct selinux_audit_rule *tmprule;
3478 struct role_datum *roledatum;
3479 struct type_datum *typedatum;
3480 struct user_datum *userdatum;
3481 struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule;
3486 if (!selinux_initialized(state))
3490 case AUDIT_SUBJ_USER:
3491 case AUDIT_SUBJ_ROLE:
3492 case AUDIT_SUBJ_TYPE:
3493 case AUDIT_OBJ_USER:
3494 case AUDIT_OBJ_ROLE:
3495 case AUDIT_OBJ_TYPE:
3496 /* only 'equals' and 'not equals' fit user, role, and type */
3497 if (op != Audit_equal && op != Audit_not_equal)
3500 case AUDIT_SUBJ_SEN:
3501 case AUDIT_SUBJ_CLR:
3502 case AUDIT_OBJ_LEV_LOW:
3503 case AUDIT_OBJ_LEV_HIGH:
3504 /* we do not allow a range, indicated by the presence of '-' */
3505 if (strchr(rulestr, '-'))
3509 /* only the above fields are valid */
3513 tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL);
3517 context_init(&tmprule->au_ctxt);
3520 policy = rcu_dereference(state->policy);
3521 policydb = &policy->policydb;
3523 tmprule->au_seqno = policy->latest_granting;
3526 case AUDIT_SUBJ_USER:
3527 case AUDIT_OBJ_USER:
3529 userdatum = symtab_search(&policydb->p_users, rulestr);
3532 tmprule->au_ctxt.user = userdatum->value;
3534 case AUDIT_SUBJ_ROLE:
3535 case AUDIT_OBJ_ROLE:
3537 roledatum = symtab_search(&policydb->p_roles, rulestr);
3540 tmprule->au_ctxt.role = roledatum->value;
3542 case AUDIT_SUBJ_TYPE:
3543 case AUDIT_OBJ_TYPE:
3545 typedatum = symtab_search(&policydb->p_types, rulestr);
3548 tmprule->au_ctxt.type = typedatum->value;
3550 case AUDIT_SUBJ_SEN:
3551 case AUDIT_SUBJ_CLR:
3552 case AUDIT_OBJ_LEV_LOW:
3553 case AUDIT_OBJ_LEV_HIGH:
3554 rc = mls_from_string(policydb, rulestr, &tmprule->au_ctxt,
3565 selinux_audit_rule_free(tmprule);
3574 /* Check to see if the rule contains any selinux fields */
3575 int selinux_audit_rule_known(struct audit_krule *rule)
3579 for (i = 0; i < rule->field_count; i++) {
3580 struct audit_field *f = &rule->fields[i];
3582 case AUDIT_SUBJ_USER:
3583 case AUDIT_SUBJ_ROLE:
3584 case AUDIT_SUBJ_TYPE:
3585 case AUDIT_SUBJ_SEN:
3586 case AUDIT_SUBJ_CLR:
3587 case AUDIT_OBJ_USER:
3588 case AUDIT_OBJ_ROLE:
3589 case AUDIT_OBJ_TYPE:
3590 case AUDIT_OBJ_LEV_LOW:
3591 case AUDIT_OBJ_LEV_HIGH:
3599 int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule)
3601 struct selinux_state *state = &selinux_state;
3602 struct selinux_policy *policy;
3603 struct context *ctxt;
3604 struct mls_level *level;
3605 struct selinux_audit_rule *rule = vrule;
3608 if (unlikely(!rule)) {
3609 WARN_ONCE(1, "selinux_audit_rule_match: missing rule\n");
3613 if (!selinux_initialized(state))
3618 policy = rcu_dereference(state->policy);
3620 if (rule->au_seqno < policy->latest_granting) {
3625 ctxt = sidtab_search(policy->sidtab, sid);
3626 if (unlikely(!ctxt)) {
3627 WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n",
3633 /* a field/op pair that is not caught here will simply fall through
3636 case AUDIT_SUBJ_USER:
3637 case AUDIT_OBJ_USER:
3640 match = (ctxt->user == rule->au_ctxt.user);
3642 case Audit_not_equal:
3643 match = (ctxt->user != rule->au_ctxt.user);
3647 case AUDIT_SUBJ_ROLE:
3648 case AUDIT_OBJ_ROLE:
3651 match = (ctxt->role == rule->au_ctxt.role);
3653 case Audit_not_equal:
3654 match = (ctxt->role != rule->au_ctxt.role);
3658 case AUDIT_SUBJ_TYPE:
3659 case AUDIT_OBJ_TYPE:
3662 match = (ctxt->type == rule->au_ctxt.type);
3664 case Audit_not_equal:
3665 match = (ctxt->type != rule->au_ctxt.type);
3669 case AUDIT_SUBJ_SEN:
3670 case AUDIT_SUBJ_CLR:
3671 case AUDIT_OBJ_LEV_LOW:
3672 case AUDIT_OBJ_LEV_HIGH:
3673 level = ((field == AUDIT_SUBJ_SEN ||
3674 field == AUDIT_OBJ_LEV_LOW) ?
3675 &ctxt->range.level[0] : &ctxt->range.level[1]);
3678 match = mls_level_eq(&rule->au_ctxt.range.level[0],
3681 case Audit_not_equal:
3682 match = !mls_level_eq(&rule->au_ctxt.range.level[0],
3686 match = (mls_level_dom(&rule->au_ctxt.range.level[0],
3688 !mls_level_eq(&rule->au_ctxt.range.level[0],
3692 match = mls_level_dom(&rule->au_ctxt.range.level[0],
3696 match = (mls_level_dom(level,
3697 &rule->au_ctxt.range.level[0]) &&
3698 !mls_level_eq(level,
3699 &rule->au_ctxt.range.level[0]));
3702 match = mls_level_dom(level,
3703 &rule->au_ctxt.range.level[0]);
3713 static int aurule_avc_callback(u32 event)
3715 if (event == AVC_CALLBACK_RESET)
3716 return audit_update_lsm_rules();
3720 static int __init aurule_init(void)
3724 err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET);
3726 panic("avc_add_callback() failed, error %d\n", err);
3730 __initcall(aurule_init);
3732 #ifdef CONFIG_NETLABEL
3734 * security_netlbl_cache_add - Add an entry to the NetLabel cache
3735 * @secattr: the NetLabel packet security attributes
3736 * @sid: the SELinux SID
3739 * Attempt to cache the context in @ctx, which was derived from the packet in
3740 * @skb, in the NetLabel subsystem cache. This function assumes @secattr has
3741 * already been initialized.
3744 static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr,
3749 sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC);
3750 if (sid_cache == NULL)
3752 secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC);
3753 if (secattr->cache == NULL) {
3759 secattr->cache->free = kfree;
3760 secattr->cache->data = sid_cache;
3761 secattr->flags |= NETLBL_SECATTR_CACHE;
3765 * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID
3766 * @secattr: the NetLabel packet security attributes
3767 * @sid: the SELinux SID
3770 * Convert the given NetLabel security attributes in @secattr into a
3771 * SELinux SID. If the @secattr field does not contain a full SELinux
3772 * SID/context then use SECINITSID_NETMSG as the foundation. If possible the
3773 * 'cache' field of @secattr is set and the CACHE flag is set; this is to
3774 * allow the @secattr to be used by NetLabel to cache the secattr to SID
3775 * conversion for future lookups. Returns zero on success, negative values on
3779 int security_netlbl_secattr_to_sid(struct selinux_state *state,
3780 struct netlbl_lsm_secattr *secattr,
3783 struct selinux_policy *policy;
3784 struct policydb *policydb;
3785 struct sidtab *sidtab;
3787 struct context *ctx;
3788 struct context ctx_new;
3790 if (!selinux_initialized(state)) {
3796 policy = rcu_dereference(state->policy);
3797 policydb = &policy->policydb;
3798 sidtab = policy->sidtab;
3800 if (secattr->flags & NETLBL_SECATTR_CACHE)
3801 *sid = *(u32 *)secattr->cache->data;
3802 else if (secattr->flags & NETLBL_SECATTR_SECID)
3803 *sid = secattr->attr.secid;
3804 else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {
3806 ctx = sidtab_search(sidtab, SECINITSID_NETMSG);
3810 context_init(&ctx_new);
3811 ctx_new.user = ctx->user;
3812 ctx_new.role = ctx->role;
3813 ctx_new.type = ctx->type;
3814 mls_import_netlbl_lvl(policydb, &ctx_new, secattr);
3815 if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {
3816 rc = mls_import_netlbl_cat(policydb, &ctx_new, secattr);
3821 if (!mls_context_isvalid(policydb, &ctx_new))
3824 rc = sidtab_context_to_sid(sidtab, &ctx_new, sid);
3828 security_netlbl_cache_add(secattr, *sid);
3830 ebitmap_destroy(&ctx_new.range.level[0].cat);
3837 ebitmap_destroy(&ctx_new.range.level[0].cat);
3844 * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr
3845 * @sid: the SELinux SID
3846 * @secattr: the NetLabel packet security attributes
3849 * Convert the given SELinux SID in @sid into a NetLabel security attribute.
3850 * Returns zero on success, negative values on failure.
3853 int security_netlbl_sid_to_secattr(struct selinux_state *state,
3854 u32 sid, struct netlbl_lsm_secattr *secattr)
3856 struct selinux_policy *policy;
3857 struct policydb *policydb;
3859 struct context *ctx;
3861 if (!selinux_initialized(state))
3865 policy = rcu_dereference(state->policy);
3866 policydb = &policy->policydb;
3869 ctx = sidtab_search(policy->sidtab, sid);
3874 secattr->domain = kstrdup(sym_name(policydb, SYM_TYPES, ctx->type - 1),
3876 if (secattr->domain == NULL)
3879 secattr->attr.secid = sid;
3880 secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID;
3881 mls_export_netlbl_lvl(policydb, ctx, secattr);
3882 rc = mls_export_netlbl_cat(policydb, ctx, secattr);
3887 #endif /* CONFIG_NETLABEL */
3890 * __security_read_policy - read the policy.
3891 * @policy: SELinux policy
3892 * @data: binary policy data
3893 * @len: length of data in bytes
3896 static int __security_read_policy(struct selinux_policy *policy,
3897 void *data, size_t *len)
3900 struct policy_file fp;
3905 rc = policydb_write(&policy->policydb, &fp);
3909 *len = (unsigned long)fp.data - (unsigned long)data;
3914 * security_read_policy - read the policy.
3915 * @state: selinux_state
3916 * @data: binary policy data
3917 * @len: length of data in bytes
3920 int security_read_policy(struct selinux_state *state,
3921 void **data, size_t *len)
3923 struct selinux_policy *policy;
3925 policy = rcu_dereference_protected(
3926 state->policy, lockdep_is_held(&state->policy_mutex));
3930 *len = policy->policydb.len;
3931 *data = vmalloc_user(*len);
3935 return __security_read_policy(policy, *data, len);
3939 * security_read_state_kernel - read the policy.
3940 * @state: selinux_state
3941 * @data: binary policy data
3942 * @len: length of data in bytes
3944 * Allocates kernel memory for reading SELinux policy.
3945 * This function is for internal use only and should not
3946 * be used for returning data to user space.
3948 * This function must be called with policy_mutex held.
3950 int security_read_state_kernel(struct selinux_state *state,
3951 void **data, size_t *len)
3953 struct selinux_policy *policy;
3955 policy = rcu_dereference_protected(
3956 state->policy, lockdep_is_held(&state->policy_mutex));
3960 *len = policy->policydb.len;
3961 *data = vmalloc(*len);
3965 return __security_read_policy(policy, *data, len);