| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Stephen D. Smalley | 6783 | 41.15% | 23 | 15.75% |
| Andrew Morton | 2767 | 16.79% | 6 | 4.11% |
| Eric Paris | 1158 | 7.02% | 25 | 17.12% |
| Jeff Vander Stoep | 1152 | 6.99% | 1 | 0.68% |
| Darrel Goeddel | 1055 | 6.40% | 5 | 3.42% |
| Venkat Yekkirala | 549 | 3.33% | 7 | 4.79% |
| Christopher J. PeBenito | 452 | 2.74% | 1 | 0.68% |
| Paul Moore | 407 | 2.47% | 23 | 15.75% |
| KaiGai Kohei | 392 | 2.38% | 6 | 4.11% |
| Chad Sellers | 327 | 1.98% | 1 | 0.68% |
| Daniel Jurgens | 318 | 1.93% | 2 | 1.37% |
| James Morris | 228 | 1.38% | 7 | 4.79% |
| Guido Trentalancia | 224 | 1.36% | 2 | 1.37% |
| Ahmed S. Darwish | 125 | 0.76% | 1 | 0.68% |
| Harry Ciao | 88 | 0.53% | 2 | 1.37% |
| Andrew Perepechko | 87 | 0.53% | 1 | 0.68% |
| Tim Gardner | 74 | 0.45% | 1 | 0.68% |
| Waiman Long | 53 | 0.32% | 1 | 0.68% |
| Rasmus Villemoes | 47 | 0.29% | 4 | 2.74% |
| Steve Grubb | 41 | 0.25% | 1 | 0.68% |
| pender01 | 34 | 0.21% | 1 | 0.68% |
| Richard Guy Briggs | 22 | 0.13% | 3 | 2.05% |
| Kohei Kaigai | 19 | 0.12% | 1 | 0.68% |
| Al Viro | 14 | 0.08% | 1 | 0.68% |
| Anand V. Avati | 8 | 0.05% | 1 | 0.68% |
| Eric W. Biedermann | 6 | 0.04% | 1 | 0.68% |
| Jesper Juhl | 6 | 0.04% | 1 | 0.68% |
| Sachin Grover | 6 | 0.04% | 1 | 0.68% |
| Linus Torvalds | 6 | 0.04% | 1 | 0.68% |
| Nikolay Aleksandrov | 5 | 0.03% | 1 | 0.68% |
| James Carter | 5 | 0.03% | 1 | 0.68% |
| Thomas Gleixner | 3 | 0.02% | 1 | 0.68% |
| Serge E. Hallyn | 3 | 0.02% | 1 | 0.68% |
| Adrian Bunk | 3 | 0.02% | 1 | 0.68% |
| Stephen Rothwell | 3 | 0.02% | 1 | 0.68% |
| Prarit Bhargava | 3 | 0.02% | 1 | 0.68% |
| Julia Lawall | 2 | 0.01% | 1 | 0.68% |
| Kees Cook | 2 | 0.01% | 1 | 0.68% |
| Lucas De Marchi | 2 | 0.01% | 1 | 0.68% |
| Harvey Harrison | 1 | 0.01% | 1 | 0.68% |
| Ingo Molnar | 1 | 0.01% | 1 | 0.68% |
| Jann Horn | 1 | 0.01% | 1 | 0.68% |
| Steve G | 1 | 0.01% | 1 | 0.68% |
| Jiri Kosina | 1 | 0.01% | 1 | 0.68% |
| Total | 16484 | 146 |
/* * Implementation of the security services. * * Authors : Stephen Smalley, <sds@tycho.nsa.gov> * James Morris <jmorris@redhat.com> * * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> * * Support for enhanced MLS infrastructure. * Support for context based audit filters. * * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> * * Added conditional policy language extensions * * Updated: Hewlett-Packard <paul@paul-moore.com> * * Added support for NetLabel * Added support for the policy capability bitmap * * Updated: Chad Sellers <csellers@tresys.com> * * Added validation of kernel classes and permissions * * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com> * * Added support for bounds domain and audit messaged on masked permissions * * Updated: Guido Trentalancia <guido@trentalancia.com> * * Added support for runtime switching of the policy type * * Copyright (C) 2008, 2009 NEC Corporation * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2. */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/spinlock.h> #include <linux/rcupdate.h> #include <linux/errno.h> #include <linux/in.h> #include <linux/sched.h> #include <linux/audit.h> #include <linux/mutex.h> #include <linux/selinux.h> #include <linux/flex_array.h> #include <linux/vmalloc.h> #include <net/netlabel.h> #include "flask.h" #include "avc.h" #include "avc_ss.h" #include "security.h" #include "context.h" #include "policydb.h" #include "sidtab.h" #include "services.h" #include "conditional.h" #include "mls.h" #include "objsec.h" #include "netlabel.h" #include "xfrm.h" #include "ebitmap.h" #include "audit.h" /* Policy capability names */ char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX] = { "network_peer_controls", "open_perms", "extended_socket_class", "always_check_network", "cgroup_seclabel", "nnp_nosuid_transition" }; static struct selinux_ss selinux_ss; void selinux_ss_init(struct selinux_ss **ss) { rwlock_init(&selinux_ss.policy_rwlock); mutex_init(&selinux_ss.status_lock); *ss = &selinux_ss; } /* Forward declaration. */ static int context_struct_to_string(struct policydb *policydb, struct context *context, char **scontext, u32 *scontext_len); static void context_struct_compute_av(struct policydb *policydb, struct context *scontext, struct context *tcontext, u16 tclass, struct av_decision *avd, struct extended_perms *xperms); static int selinux_set_mapping(struct policydb *pol, struct security_class_mapping *map, struct selinux_map *out_map) { u16 i, j; unsigned k; bool print_unknown_handle = false; /* Find number of classes in the input mapping */ if (!map) return -EINVAL; i = 0; while (map[i].name) i++; /* Allocate space for the class records, plus one for class zero */ out_map->mapping = kcalloc(++i, sizeof(*out_map->mapping), GFP_ATOMIC); if (!out_map->mapping) return -ENOMEM; /* Store the raw class and permission values */ j = 0; while (map[j].name) { struct security_class_mapping *p_in = map + (j++); struct selinux_mapping *p_out = out_map->mapping + j; /* An empty class string skips ahead */ if (!strcmp(p_in->name, "")) { p_out->num_perms = 0; continue; } p_out->value = string_to_security_class(pol, p_in->name); if (!p_out->value) { pr_info("SELinux: Class %s not defined in policy.\n", p_in->name); if (pol->reject_unknown) goto err; p_out->num_perms = 0; print_unknown_handle = true; continue; } k = 0; while (p_in->perms[k]) { /* An empty permission string skips ahead */ if (!*p_in->perms[k]) { k++; continue; } p_out->perms[k] = string_to_av_perm(pol, p_out->value, p_in->perms[k]); if (!p_out->perms[k]) { pr_info("SELinux: Permission %s in class %s not defined in policy.\n", p_in->perms[k], p_in->name); if (pol->reject_unknown) goto err; print_unknown_handle = true; } k++; } p_out->num_perms = k; } if (print_unknown_handle) pr_info("SELinux: the above unknown classes and permissions will be %s\n", pol->allow_unknown ? "allowed" : "denied"); out_map->size = i; return 0; err: kfree(out_map->mapping); out_map->mapping = NULL; return -EINVAL; } /* * Get real, policy values from mapped values */ static u16 unmap_class(struct selinux_map *map, u16 tclass) { if (tclass < map->size) return map->mapping[tclass].value; return tclass; } /* * Get kernel value for class from its policy value */ static u16 map_class(struct selinux_map *map, u16 pol_value) { u16 i; for (i = 1; i < map->size; i++) { if (map->mapping[i].value == pol_value) return i; } return SECCLASS_NULL; } static void map_decision(struct selinux_map *map, u16 tclass, struct av_decision *avd, int allow_unknown) { if (tclass < map->size) { struct selinux_mapping *mapping = &map->mapping[tclass]; unsigned int i, n = mapping->num_perms; u32 result; for (i = 0, result = 0; i < n; i++) { if (avd->allowed & mapping->perms[i]) result |= 1<<i; if (allow_unknown && !mapping->perms[i]) result |= 1<<i; } avd->allowed = result; for (i = 0, result = 0; i < n; i++) if (avd->auditallow & mapping->perms[i]) result |= 1<<i; avd->auditallow = result; for (i = 0, result = 0; i < n; i++) { if (avd->auditdeny & mapping->perms[i]) result |= 1<<i; if (!allow_unknown && !mapping->perms[i]) result |= 1<<i; } /* * In case the kernel has a bug and requests a permission * between num_perms and the maximum permission number, we * should audit that denial */ for (; i < (sizeof(u32)*8); i++) result |= 1<<i; avd->auditdeny = result; } } int security_mls_enabled(struct selinux_state *state) { struct policydb *p = &state->ss->policydb; return p->mls_enabled; } /* * Return the boolean value of a constraint expression * when it is applied to the specified source and target * security contexts. * * xcontext is a special beast... It is used by the validatetrans rules * only. For these rules, scontext is the context before the transition, * tcontext is the context after the transition, and xcontext is the context * of the process performing the transition. All other callers of * constraint_expr_eval should pass in NULL for xcontext. */ static int constraint_expr_eval(struct policydb *policydb, struct context *scontext, struct context *tcontext, struct context *xcontext, struct constraint_expr *cexpr) { u32 val1, val2; struct context *c; struct role_datum *r1, *r2; struct mls_level *l1, *l2; struct constraint_expr *e; int s[CEXPR_MAXDEPTH]; int sp = -1; for (e = cexpr; e; e = e->next) { switch (e->expr_type) { case CEXPR_NOT: BUG_ON(sp < 0); s[sp] = !s[sp]; break; case CEXPR_AND: BUG_ON(sp < 1); sp--; s[sp] &= s[sp + 1]; break; case CEXPR_OR: BUG_ON(sp < 1); sp--; s[sp] |= s[sp + 1]; break; case CEXPR_ATTR: if (sp == (CEXPR_MAXDEPTH - 1)) return 0; switch (e->attr) { case CEXPR_USER: val1 = scontext->user; val2 = tcontext->user; break; case CEXPR_TYPE: val1 = scontext->type; val2 = tcontext->type; break; case CEXPR_ROLE: val1 = scontext->role; val2 = tcontext->role; r1 = policydb->role_val_to_struct[val1 - 1]; r2 = policydb->role_val_to_struct[val2 - 1]; switch (e->op) { case CEXPR_DOM: s[++sp] = ebitmap_get_bit(&r1->dominates, val2 - 1); continue; case CEXPR_DOMBY: s[++sp] = ebitmap_get_bit(&r2->dominates, val1 - 1); continue; case CEXPR_INCOMP: s[++sp] = (!ebitmap_get_bit(&r1->dominates, val2 - 1) && !ebitmap_get_bit(&r2->dominates, val1 - 1)); continue; default: break; } break; case CEXPR_L1L2: l1 = &(scontext->range.level[0]); l2 = &(tcontext->range.level[0]); goto mls_ops; case CEXPR_L1H2: l1 = &(scontext->range.level[0]); l2 = &(tcontext->range.level[1]); goto mls_ops; case CEXPR_H1L2: l1 = &(scontext->range.level[1]); l2 = &(tcontext->range.level[0]); goto mls_ops; case CEXPR_H1H2: l1 = &(scontext->range.level[1]); l2 = &(tcontext->range.level[1]); goto mls_ops; case CEXPR_L1H1: l1 = &(scontext->range.level[0]); l2 = &(scontext->range.level[1]); goto mls_ops; case CEXPR_L2H2: l1 = &(tcontext->range.level[0]); l2 = &(tcontext->range.level[1]); goto mls_ops; mls_ops: switch (e->op) { case CEXPR_EQ: s[++sp] = mls_level_eq(l1, l2); continue; case CEXPR_NEQ: s[++sp] = !mls_level_eq(l1, l2); continue; case CEXPR_DOM: s[++sp] = mls_level_dom(l1, l2); continue; case CEXPR_DOMBY: s[++sp] = mls_level_dom(l2, l1); continue; case CEXPR_INCOMP: s[++sp] = mls_level_incomp(l2, l1); continue; default: BUG(); return 0; } break; default: BUG(); return 0; } switch (e->op) { case CEXPR_EQ: s[++sp] = (val1 == val2); break; case CEXPR_NEQ: s[++sp] = (val1 != val2); break; default: BUG(); return 0; } break; case CEXPR_NAMES: if (sp == (CEXPR_MAXDEPTH-1)) return 0; c = scontext; if (e->attr & CEXPR_TARGET) c = tcontext; else if (e->attr & CEXPR_XTARGET) { c = xcontext; if (!c) { BUG(); return 0; } } if (e->attr & CEXPR_USER) val1 = c->user; else if (e->attr & CEXPR_ROLE) val1 = c->role; else if (e->attr & CEXPR_TYPE) val1 = c->type; else { BUG(); return 0; } switch (e->op) { case CEXPR_EQ: s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); break; case CEXPR_NEQ: s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); break; default: BUG(); return 0; } break; default: BUG(); return 0; } } BUG_ON(sp != 0); return s[0]; } /* * security_dump_masked_av - dumps masked permissions during * security_compute_av due to RBAC, MLS/Constraint and Type bounds. */ static int dump_masked_av_helper(void *k, void *d, void *args) { struct perm_datum *pdatum = d; char **permission_names = args; BUG_ON(pdatum->value < 1 || pdatum->value > 32); permission_names[pdatum->value - 1] = (char *)k; return 0; } static void security_dump_masked_av(struct policydb *policydb, struct context *scontext, struct context *tcontext, u16 tclass, u32 permissions, const char *reason) { struct common_datum *common_dat; struct class_datum *tclass_dat; struct audit_buffer *ab; char *tclass_name; char *scontext_name = NULL; char *tcontext_name = NULL; char *permission_names[32]; int index; u32 length; bool need_comma = false; if (!permissions) return; tclass_name = sym_name(policydb, SYM_CLASSES, tclass - 1); tclass_dat = policydb->class_val_to_struct[tclass - 1]; common_dat = tclass_dat->comdatum; /* init permission_names */ if (common_dat && hashtab_map(common_dat->permissions.table, dump_masked_av_helper, permission_names) < 0) goto out; if (hashtab_map(tclass_dat->permissions.table, dump_masked_av_helper, permission_names) < 0) goto out; /* get scontext/tcontext in text form */ if (context_struct_to_string(policydb, scontext, &scontext_name, &length) < 0) goto out; if (context_struct_to_string(policydb, tcontext, &tcontext_name, &length) < 0) goto out; /* audit a message */ ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR); if (!ab) goto out; audit_log_format(ab, "op=security_compute_av reason=%s " "scontext=%s tcontext=%s tclass=%s perms=", reason, scontext_name, tcontext_name, tclass_name); for (index = 0; index < 32; index++) { u32 mask = (1 << index); if ((mask & permissions) == 0) continue; audit_log_format(ab, "%s%s", need_comma ? "," : "", permission_names[index] ? permission_names[index] : "????"); need_comma = true; } audit_log_end(ab); out: /* release scontext/tcontext */ kfree(tcontext_name); kfree(scontext_name); return; } /* * security_boundary_permission - drops violated permissions * on boundary constraint. */ static void type_attribute_bounds_av(struct policydb *policydb, struct context *scontext, struct context *tcontext, u16 tclass, struct av_decision *avd) { struct context lo_scontext; struct context lo_tcontext, *tcontextp = tcontext; struct av_decision lo_avd; struct type_datum *source; struct type_datum *target; u32 masked = 0; source = flex_array_get_ptr(policydb->type_val_to_struct_array, scontext->type - 1); BUG_ON(!source); if (!source->bounds) return; target = flex_array_get_ptr(policydb->type_val_to_struct_array, tcontext->type - 1); BUG_ON(!target); memset(&lo_avd, 0, sizeof(lo_avd)); memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); lo_scontext.type = source->bounds; if (target->bounds) { memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); lo_tcontext.type = target->bounds; tcontextp = &lo_tcontext; } context_struct_compute_av(policydb, &lo_scontext, tcontextp, tclass, &lo_avd, NULL); masked = ~lo_avd.allowed & avd->allowed; if (likely(!masked)) return; /* no masked permission */ /* mask violated permissions */ avd->allowed &= ~masked; /* audit masked permissions */ security_dump_masked_av(policydb, scontext, tcontext, tclass, masked, "bounds"); } /* * flag which drivers have permissions * only looking for ioctl based extended permssions */ void services_compute_xperms_drivers( struct extended_perms *xperms, struct avtab_node *node) { unsigned int i; if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { /* if one or more driver has all permissions allowed */ for (i = 0; i < ARRAY_SIZE(xperms->drivers.p); i++) xperms->drivers.p[i] |= node->datum.u.xperms->perms.p[i]; } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { /* if allowing permissions within a driver */ security_xperm_set(xperms->drivers.p, node->datum.u.xperms->driver); } /* If no ioctl commands are allowed, ignore auditallow and auditdeny */ if (node->key.specified & AVTAB_XPERMS_ALLOWED) xperms->len = 1; } /* * Compute access vectors and extended permissions based on a context * structure pair for the permissions in a particular class. */ static void context_struct_compute_av(struct policydb *policydb, struct context *scontext, struct context *tcontext, u16 tclass, struct av_decision *avd, struct extended_perms *xperms) { struct constraint_node *constraint; struct role_allow *ra; struct avtab_key avkey; struct avtab_node *node; struct class_datum *tclass_datum; struct ebitmap *sattr, *tattr; struct ebitmap_node *snode, *tnode; unsigned int i, j; avd->allowed = 0; avd->auditallow = 0; avd->auditdeny = 0xffffffff; if (xperms) { memset(&xperms->drivers, 0, sizeof(xperms->drivers)); xperms->len = 0; } if (unlikely(!tclass || tclass > policydb->p_classes.nprim)) { if (printk_ratelimit()) pr_warn("SELinux: Invalid class %hu\n", tclass); return; } tclass_datum = policydb->class_val_to_struct[tclass - 1]; /* * If a specific type enforcement rule was defined for * this permission check, then use it. */ avkey.target_class = tclass; avkey.specified = AVTAB_AV | AVTAB_XPERMS; sattr = flex_array_get(policydb->type_attr_map_array, scontext->type - 1); BUG_ON(!sattr); tattr = flex_array_get(policydb->type_attr_map_array, tcontext->type - 1); BUG_ON(!tattr); ebitmap_for_each_positive_bit(sattr, snode, i) { ebitmap_for_each_positive_bit(tattr, tnode, j) { avkey.source_type = i + 1; avkey.target_type = j + 1; for (node = avtab_search_node(&policydb->te_avtab, &avkey); node; node = avtab_search_node_next(node, avkey.specified)) { if (node->key.specified == AVTAB_ALLOWED) avd->allowed |= node->datum.u.data; else if (node->key.specified == AVTAB_AUDITALLOW) avd->auditallow |= node->datum.u.data; else if (node->key.specified == AVTAB_AUDITDENY) avd->auditdeny &= node->datum.u.data; else if (xperms && (node->key.specified & AVTAB_XPERMS)) services_compute_xperms_drivers(xperms, node); } /* Check conditional av table for additional permissions */ cond_compute_av(&policydb->te_cond_avtab, &avkey, avd, xperms); } } /* * Remove any permissions prohibited by a constraint (this includes * the MLS policy). */ constraint = tclass_datum->constraints; while (constraint) { if ((constraint->permissions & (avd->allowed)) && !constraint_expr_eval(policydb, scontext, tcontext, NULL, constraint->expr)) { avd->allowed &= ~(constraint->permissions); } constraint = constraint->next; } /* * If checking process transition permission and the * role is changing, then check the (current_role, new_role) * pair. */ if (tclass == policydb->process_class && (avd->allowed & policydb->process_trans_perms) && scontext->role != tcontext->role) { for (ra = policydb->role_allow; ra; ra = ra->next) { if (scontext->role == ra->role && tcontext->role == ra->new_role) break; } if (!ra) avd->allowed &= ~policydb->process_trans_perms; } /* * If the given source and target types have boundary * constraint, lazy checks have to mask any violated * permission and notice it to userspace via audit. */ type_attribute_bounds_av(policydb, scontext, tcontext, tclass, avd); } static int security_validtrans_handle_fail(struct selinux_state *state, struct context *ocontext, struct context *ncontext, struct context *tcontext, u16 tclass) { struct policydb *p = &state->ss->policydb; char *o = NULL, *n = NULL, *t = NULL; u32 olen, nlen, tlen; if (context_struct_to_string(p, ocontext, &o, &olen)) goto out; if (context_struct_to_string(p, ncontext, &n, &nlen)) goto out; if (context_struct_to_string(p, tcontext, &t, &tlen)) goto out; audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR, "op=security_validate_transition seresult=denied" " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", o, n, t, sym_name(p, SYM_CLASSES, tclass-1)); out: kfree(o); kfree(n); kfree(t); if (!enforcing_enabled(state)) return 0; return -EPERM; } static int security_compute_validatetrans(struct selinux_state *state, u32 oldsid, u32 newsid, u32 tasksid, u16 orig_tclass, bool user) { struct policydb *policydb; struct sidtab *sidtab; struct context *ocontext; struct context *ncontext; struct context *tcontext; struct class_datum *tclass_datum; struct constraint_node *constraint; u16 tclass; int rc = 0; if (!state->initialized) return 0; read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; if (!user) tclass = unmap_class(&state->ss->map, orig_tclass); else tclass = orig_tclass; if (!tclass || tclass > policydb->p_classes.nprim) { rc = -EINVAL; goto out; } tclass_datum = policydb->class_val_to_struct[tclass - 1]; ocontext = sidtab_search(sidtab, oldsid); if (!ocontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, oldsid); rc = -EINVAL; goto out; } ncontext = sidtab_search(sidtab, newsid); if (!ncontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, newsid); rc = -EINVAL; goto out; } tcontext = sidtab_search(sidtab, tasksid); if (!tcontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, tasksid); rc = -EINVAL; goto out; } constraint = tclass_datum->validatetrans; while (constraint) { if (!constraint_expr_eval(policydb, ocontext, ncontext, tcontext, constraint->expr)) { if (user) rc = -EPERM; else rc = security_validtrans_handle_fail(state, ocontext, ncontext, tcontext, tclass); goto out; } constraint = constraint->next; } out: read_unlock(&state->ss->policy_rwlock); return rc; } int security_validate_transition_user(struct selinux_state *state, u32 oldsid, u32 newsid, u32 tasksid, u16 tclass) { return security_compute_validatetrans(state, oldsid, newsid, tasksid, tclass, true); } int security_validate_transition(struct selinux_state *state, u32 oldsid, u32 newsid, u32 tasksid, u16 orig_tclass) { return security_compute_validatetrans(state, oldsid, newsid, tasksid, orig_tclass, false); } /* * security_bounded_transition - check whether the given * transition is directed to bounded, or not. * It returns 0, if @newsid is bounded by @oldsid. * Otherwise, it returns error code. * * @oldsid : current security identifier * @newsid : destinated security identifier */ int security_bounded_transition(struct selinux_state *state, u32 old_sid, u32 new_sid) { struct policydb *policydb; struct sidtab *sidtab; struct context *old_context, *new_context; struct type_datum *type; int index; int rc; if (!state->initialized) return 0; read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; rc = -EINVAL; old_context = sidtab_search(sidtab, old_sid); if (!old_context) { pr_err("SELinux: %s: unrecognized SID %u\n", __func__, old_sid); goto out; } rc = -EINVAL; new_context = sidtab_search(sidtab, new_sid); if (!new_context) { pr_err("SELinux: %s: unrecognized SID %u\n", __func__, new_sid); goto out; } rc = 0; /* type/domain unchanged */ if (old_context->type == new_context->type) goto out; index = new_context->type; while (true) { type = flex_array_get_ptr(policydb->type_val_to_struct_array, index - 1); BUG_ON(!type); /* not bounded anymore */ rc = -EPERM; if (!type->bounds) break; /* @newsid is bounded by @oldsid */ rc = 0; if (type->bounds == old_context->type) break; index = type->bounds; } if (rc) { char *old_name = NULL; char *new_name = NULL; u32 length; if (!context_struct_to_string(policydb, old_context, &old_name, &length) && !context_struct_to_string(policydb, new_context, &new_name, &length)) { audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR, "op=security_bounded_transition " "seresult=denied " "oldcontext=%s newcontext=%s", old_name, new_name); } kfree(new_name); kfree(old_name); } out: read_unlock(&state->ss->policy_rwlock); return rc; } static void avd_init(struct selinux_state *state, struct av_decision *avd) { avd->allowed = 0; avd->auditallow = 0; avd->auditdeny = 0xffffffff; avd->seqno = state->ss->latest_granting; avd->flags = 0; } void services_compute_xperms_decision(struct extended_perms_decision *xpermd, struct avtab_node *node) { unsigned int i; if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { if (xpermd->driver != node->datum.u.xperms->driver) return; } else if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { if (!security_xperm_test(node->datum.u.xperms->perms.p, xpermd->driver)) return; } else { BUG(); } if (node->key.specified == AVTAB_XPERMS_ALLOWED) { xpermd->used |= XPERMS_ALLOWED; if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { memset(xpermd->allowed->p, 0xff, sizeof(xpermd->allowed->p)); } if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { for (i = 0; i < ARRAY_SIZE(xpermd->allowed->p); i++) xpermd->allowed->p[i] |= node->datum.u.xperms->perms.p[i]; } } else if (node->key.specified == AVTAB_XPERMS_AUDITALLOW) { xpermd->used |= XPERMS_AUDITALLOW; if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { memset(xpermd->auditallow->p, 0xff, sizeof(xpermd->auditallow->p)); } if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { for (i = 0; i < ARRAY_SIZE(xpermd->auditallow->p); i++) xpermd->auditallow->p[i] |= node->datum.u.xperms->perms.p[i]; } } else if (node->key.specified == AVTAB_XPERMS_DONTAUDIT) { xpermd->used |= XPERMS_DONTAUDIT; if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLDRIVER) { memset(xpermd->dontaudit->p, 0xff, sizeof(xpermd->dontaudit->p)); } if (node->datum.u.xperms->specified == AVTAB_XPERMS_IOCTLFUNCTION) { for (i = 0; i < ARRAY_SIZE(xpermd->dontaudit->p); i++) xpermd->dontaudit->p[i] |= node->datum.u.xperms->perms.p[i]; } } else { BUG(); } } void security_compute_xperms_decision(struct selinux_state *state, u32 ssid, u32 tsid, u16 orig_tclass, u8 driver, struct extended_perms_decision *xpermd) { struct policydb *policydb; struct sidtab *sidtab; u16 tclass; struct context *scontext, *tcontext; struct avtab_key avkey; struct avtab_node *node; struct ebitmap *sattr, *tattr; struct ebitmap_node *snode, *tnode; unsigned int i, j; xpermd->driver = driver; xpermd->used = 0; memset(xpermd->allowed->p, 0, sizeof(xpermd->allowed->p)); memset(xpermd->auditallow->p, 0, sizeof(xpermd->auditallow->p)); memset(xpermd->dontaudit->p, 0, sizeof(xpermd->dontaudit->p)); read_lock(&state->ss->policy_rwlock); if (!state->initialized) goto allow; policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; scontext = sidtab_search(sidtab, ssid); if (!scontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, ssid); goto out; } tcontext = sidtab_search(sidtab, tsid); if (!tcontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, tsid); goto out; } tclass = unmap_class(&state->ss->map, orig_tclass); if (unlikely(orig_tclass && !tclass)) { if (policydb->allow_unknown) goto allow; goto out; } if (unlikely(!tclass || tclass > policydb->p_classes.nprim)) { pr_warn_ratelimited("SELinux: Invalid class %hu\n", tclass); goto out; } avkey.target_class = tclass; avkey.specified = AVTAB_XPERMS; sattr = flex_array_get(policydb->type_attr_map_array, scontext->type - 1); BUG_ON(!sattr); tattr = flex_array_get(policydb->type_attr_map_array, tcontext->type - 1); BUG_ON(!tattr); ebitmap_for_each_positive_bit(sattr, snode, i) { ebitmap_for_each_positive_bit(tattr, tnode, j) { avkey.source_type = i + 1; avkey.target_type = j + 1; for (node = avtab_search_node(&policydb->te_avtab, &avkey); node; node = avtab_search_node_next(node, avkey.specified)) services_compute_xperms_decision(xpermd, node); cond_compute_xperms(&policydb->te_cond_avtab, &avkey, xpermd); } } out: read_unlock(&state->ss->policy_rwlock); return; allow: memset(xpermd->allowed->p, 0xff, sizeof(xpermd->allowed->p)); goto out; } /** * security_compute_av - Compute access vector decisions. * @ssid: source security identifier * @tsid: target security identifier * @tclass: target security class * @avd: access vector decisions * @xperms: extended permissions * * Compute a set of access vector decisions based on the * SID pair (@ssid, @tsid) for the permissions in @tclass. */ void security_compute_av(struct selinux_state *state, u32 ssid, u32 tsid, u16 orig_tclass, struct av_decision *avd, struct extended_perms *xperms) { struct policydb *policydb; struct sidtab *sidtab; u16 tclass; struct context *scontext = NULL, *tcontext = NULL; read_lock(&state->ss->policy_rwlock); avd_init(state, avd); xperms->len = 0; if (!state->initialized) goto allow; policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; scontext = sidtab_search(sidtab, ssid); if (!scontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, ssid); goto out; } /* permissive domain? */ if (ebitmap_get_bit(&policydb->permissive_map, scontext->type)) avd->flags |= AVD_FLAGS_PERMISSIVE; tcontext = sidtab_search(sidtab, tsid); if (!tcontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, tsid); goto out; } tclass = unmap_class(&state->ss->map, orig_tclass); if (unlikely(orig_tclass && !tclass)) { if (policydb->allow_unknown) goto allow; goto out; } context_struct_compute_av(policydb, scontext, tcontext, tclass, avd, xperms); map_decision(&state->ss->map, orig_tclass, avd, policydb->allow_unknown); out: read_unlock(&state->ss->policy_rwlock); return; allow: avd->allowed = 0xffffffff; goto out; } void security_compute_av_user(struct selinux_state *state, u32 ssid, u32 tsid, u16 tclass, struct av_decision *avd) { struct policydb *policydb; struct sidtab *sidtab; struct context *scontext = NULL, *tcontext = NULL; read_lock(&state->ss->policy_rwlock); avd_init(state, avd); if (!state->initialized) goto allow; policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; scontext = sidtab_search(sidtab, ssid); if (!scontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, ssid); goto out; } /* permissive domain? */ if (ebitmap_get_bit(&policydb->permissive_map, scontext->type)) avd->flags |= AVD_FLAGS_PERMISSIVE; tcontext = sidtab_search(sidtab, tsid); if (!tcontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, tsid); goto out; } if (unlikely(!tclass)) { if (policydb->allow_unknown) goto allow; goto out; } context_struct_compute_av(policydb, scontext, tcontext, tclass, avd, NULL); out: read_unlock(&state->ss->policy_rwlock); return; allow: avd->allowed = 0xffffffff; goto out; } /* * Write the security context string representation of * the context structure `context' into a dynamically * allocated string of the correct size. Set `*scontext' * to point to this string and set `*scontext_len' to * the length of the string. */ static int context_struct_to_string(struct policydb *p, struct context *context, char **scontext, u32 *scontext_len) { char *scontextp; if (scontext) *scontext = NULL; *scontext_len = 0; if (context->len) { *scontext_len = context->len; if (scontext) { *scontext = kstrdup(context->str, GFP_ATOMIC); if (!(*scontext)) return -ENOMEM; } return 0; } /* Compute the size of the context. */ *scontext_len += strlen(sym_name(p, SYM_USERS, context->user - 1)) + 1; *scontext_len += strlen(sym_name(p, SYM_ROLES, context->role - 1)) + 1; *scontext_len += strlen(sym_name(p, SYM_TYPES, context->type - 1)) + 1; *scontext_len += mls_compute_context_len(p, context); if (!scontext) return 0; /* Allocate space for the context; caller must free this space. */ scontextp = kmalloc(*scontext_len, GFP_ATOMIC); if (!scontextp) return -ENOMEM; *scontext = scontextp; /* * Copy the user name, role name and type name into the context. */ scontextp += sprintf(scontextp, "%s:%s:%s", sym_name(p, SYM_USERS, context->user - 1), sym_name(p, SYM_ROLES, context->role - 1), sym_name(p, SYM_TYPES, context->type - 1)); mls_sid_to_context(p, context, &scontextp); *scontextp = 0; return 0; } #include "initial_sid_to_string.h" const char *security_get_initial_sid_context(u32 sid) { if (unlikely(sid > SECINITSID_NUM)) return NULL; return initial_sid_to_string[sid]; } static int security_sid_to_context_core(struct selinux_state *state, u32 sid, char **scontext, u32 *scontext_len, int force) { struct policydb *policydb; struct sidtab *sidtab; struct context *context; int rc = 0; if (scontext) *scontext = NULL; *scontext_len = 0; if (!state->initialized) { if (sid <= SECINITSID_NUM) { char *scontextp; *scontext_len = strlen(initial_sid_to_string[sid]) + 1; if (!scontext) goto out; scontextp = kmemdup(initial_sid_to_string[sid], *scontext_len, GFP_ATOMIC); if (!scontextp) { rc = -ENOMEM; goto out; } *scontext = scontextp; goto out; } pr_err("SELinux: %s: called before initial " "load_policy on unknown SID %d\n", __func__, sid); rc = -EINVAL; goto out; } read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; if (force) context = sidtab_search_force(sidtab, sid); else context = sidtab_search(sidtab, sid); if (!context) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, sid); rc = -EINVAL; goto out_unlock; } rc = context_struct_to_string(policydb, context, scontext, scontext_len); out_unlock: read_unlock(&state->ss->policy_rwlock); out: return rc; } /** * security_sid_to_context - Obtain a context for a given SID. * @sid: security identifier, SID * @scontext: security context * @scontext_len: length in bytes * * Write the string representation of the context associated with @sid * into a dynamically allocated string of the correct size. Set @scontext * to point to this string and set @scontext_len to the length of the string. */ int security_sid_to_context(struct selinux_state *state, u32 sid, char **scontext, u32 *scontext_len) { return security_sid_to_context_core(state, sid, scontext, scontext_len, 0); } int security_sid_to_context_force(struct selinux_state *state, u32 sid, char **scontext, u32 *scontext_len) { return security_sid_to_context_core(state, sid, scontext, scontext_len, 1); } /* * Caveat: Mutates scontext. */ static int string_to_context_struct(struct policydb *pol, struct sidtab *sidtabp, char *scontext, struct context *ctx, u32 def_sid) { struct role_datum *role; struct type_datum *typdatum; struct user_datum *usrdatum; char *scontextp, *p, oldc; int rc = 0; context_init(ctx); /* Parse the security context. */ rc = -EINVAL; scontextp = (char *) scontext; /* Extract the user. */ p = scontextp; while (*p && *p != ':') p++; if (*p == 0) goto out; *p++ = 0; usrdatum = hashtab_search(pol->p_users.table, scontextp); if (!usrdatum) goto out; ctx->user = usrdatum->value; /* Extract role. */ scontextp = p; while (*p && *p != ':') p++; if (*p == 0) goto out; *p++ = 0; role = hashtab_search(pol->p_roles.table, scontextp); if (!role) goto out; ctx->role = role->value; /* Extract type. */ scontextp = p; while (*p && *p != ':') p++; oldc = *p; *p++ = 0; typdatum = hashtab_search(pol->p_types.table, scontextp); if (!typdatum || typdatum->attribute) goto out; ctx->type = typdatum->value; rc = mls_context_to_sid(pol, oldc, p, ctx, sidtabp, def_sid); if (rc) goto out; /* Check the validity of the new context. */ rc = -EINVAL; if (!policydb_context_isvalid(pol, ctx)) goto out; rc = 0; out: if (rc) context_destroy(ctx); return rc; } static int security_context_to_sid_core(struct selinux_state *state, const char *scontext, u32 scontext_len, u32 *sid, u32 def_sid, gfp_t gfp_flags, int force) { struct policydb *policydb; struct sidtab *sidtab; char *scontext2, *str = NULL; struct context context; int rc = 0; /* An empty security context is never valid. */ if (!scontext_len) return -EINVAL; /* Copy the string to allow changes and ensure a NUL terminator */ scontext2 = kmemdup_nul(scontext, scontext_len, gfp_flags); if (!scontext2) return -ENOMEM; if (!state->initialized) { int i; for (i = 1; i < SECINITSID_NUM; i++) { if (!strcmp(initial_sid_to_string[i], scontext2)) { *sid = i; goto out; } } *sid = SECINITSID_KERNEL; goto out; } *sid = SECSID_NULL; if (force) { /* Save another copy for storing in uninterpreted form */ rc = -ENOMEM; str = kstrdup(scontext2, gfp_flags); if (!str) goto out; } read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; rc = string_to_context_struct(policydb, sidtab, scontext2, &context, def_sid); if (rc == -EINVAL && force) { context.str = str; context.len = strlen(str) + 1; str = NULL; } else if (rc) goto out_unlock; rc = sidtab_context_to_sid(sidtab, &context, sid); context_destroy(&context); out_unlock: read_unlock(&state->ss->policy_rwlock); out: kfree(scontext2); kfree(str); return rc; } /** * security_context_to_sid - Obtain a SID for a given security context. * @scontext: security context * @scontext_len: length in bytes * @sid: security identifier, SID * @gfp: context for the allocation * * Obtains a SID associated with the security context that * has the string representation specified by @scontext. * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient * memory is available, or 0 on success. */ int security_context_to_sid(struct selinux_state *state, const char *scontext, u32 scontext_len, u32 *sid, gfp_t gfp) { return security_context_to_sid_core(state, scontext, scontext_len, sid, SECSID_NULL, gfp, 0); } int security_context_str_to_sid(struct selinux_state *state, const char *scontext, u32 *sid, gfp_t gfp) { return security_context_to_sid(state, scontext, strlen(scontext), sid, gfp); } /** * security_context_to_sid_default - Obtain a SID for a given security context, * falling back to specified default if needed. * * @scontext: security context * @scontext_len: length in bytes * @sid: security identifier, SID * @def_sid: default SID to assign on error * * Obtains a SID associated with the security context that * has the string representation specified by @scontext. * The default SID is passed to the MLS layer to be used to allow * kernel labeling of the MLS field if the MLS field is not present * (for upgrading to MLS without full relabel). * Implicitly forces adding of the context even if it cannot be mapped yet. * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient * memory is available, or 0 on success. */ int security_context_to_sid_default(struct selinux_state *state, const char *scontext, u32 scontext_len, u32 *sid, u32 def_sid, gfp_t gfp_flags) { return security_context_to_sid_core(state, scontext, scontext_len, sid, def_sid, gfp_flags, 1); } int security_context_to_sid_force(struct selinux_state *state, const char *scontext, u32 scontext_len, u32 *sid) { return security_context_to_sid_core(state, scontext, scontext_len, sid, SECSID_NULL, GFP_KERNEL, 1); } static int compute_sid_handle_invalid_context( struct selinux_state *state, struct context *scontext, struct context *tcontext, u16 tclass, struct context *newcontext) { struct policydb *policydb = &state->ss->policydb; char *s = NULL, *t = NULL, *n = NULL; u32 slen, tlen, nlen; if (context_struct_to_string(policydb, scontext, &s, &slen)) goto out; if (context_struct_to_string(policydb, tcontext, &t, &tlen)) goto out; if (context_struct_to_string(policydb, newcontext, &n, &nlen)) goto out; audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR, "op=security_compute_sid invalid_context=%s" " scontext=%s" " tcontext=%s" " tclass=%s", n, s, t, sym_name(policydb, SYM_CLASSES, tclass-1)); out: kfree(s); kfree(t); kfree(n); if (!enforcing_enabled(state)) return 0; return -EACCES; } static void filename_compute_type(struct policydb *policydb, struct context *newcontext, u32 stype, u32 ttype, u16 tclass, const char *objname) { struct filename_trans ft; struct filename_trans_datum *otype; /* * Most filename trans rules are going to live in specific directories * like /dev or /var/run. This bitmap will quickly skip rule searches * if the ttype does not contain any rules. */ if (!ebitmap_get_bit(&policydb->filename_trans_ttypes, ttype)) return; ft.stype = stype; ft.ttype = ttype; ft.tclass = tclass; ft.name = objname; otype = hashtab_search(policydb->filename_trans, &ft); if (otype) newcontext->type = otype->otype; } static int security_compute_sid(struct selinux_state *state, u32 ssid, u32 tsid, u16 orig_tclass, u32 specified, const char *objname, u32 *out_sid, bool kern) { struct policydb *policydb; struct sidtab *sidtab; struct class_datum *cladatum = NULL; struct context *scontext = NULL, *tcontext = NULL, newcontext; struct role_trans *roletr = NULL; struct avtab_key avkey; struct avtab_datum *avdatum; struct avtab_node *node; u16 tclass; int rc = 0; bool sock; if (!state->initialized) { switch (orig_tclass) { case SECCLASS_PROCESS: /* kernel value */ *out_sid = ssid; break; default: *out_sid = tsid; break; } goto out; } context_init(&newcontext); read_lock(&state->ss->policy_rwlock); if (kern) { tclass = unmap_class(&state->ss->map, orig_tclass); sock = security_is_socket_class(orig_tclass); } else { tclass = orig_tclass; sock = security_is_socket_class(map_class(&state->ss->map, tclass)); } policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; scontext = sidtab_search(sidtab, ssid); if (!scontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, ssid); rc = -EINVAL; goto out_unlock; } tcontext = sidtab_search(sidtab, tsid); if (!tcontext) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, tsid); rc = -EINVAL; goto out_unlock; } if (tclass && tclass <= policydb->p_classes.nprim) cladatum = policydb->class_val_to_struct[tclass - 1]; /* Set the user identity. */ switch (specified) { case AVTAB_TRANSITION: case AVTAB_CHANGE: if (cladatum && cladatum->default_user == DEFAULT_TARGET) { newcontext.user = tcontext->user; } else { /* notice this gets both DEFAULT_SOURCE and unset */ /* Use the process user identity. */ newcontext.user = scontext->user; } break; case AVTAB_MEMBER: /* Use the related object owner. */ newcontext.user = tcontext->user; break; } /* Set the role to default values. */ if (cladatum && cladatum->default_role == DEFAULT_SOURCE) { newcontext.role = scontext->role; } else if (cladatum && cladatum->default_role == DEFAULT_TARGET) { newcontext.role = tcontext->role; } else { if ((tclass == policydb->process_class) || (sock == true)) newcontext.role = scontext->role; else newcontext.role = OBJECT_R_VAL; } /* Set the type to default values. */ if (cladatum && cladatum->default_type == DEFAULT_SOURCE) { newcontext.type = scontext->type; } else if (cladatum && cladatum->default_type == DEFAULT_TARGET) { newcontext.type = tcontext->type; } else { if ((tclass == policydb->process_class) || (sock == true)) { /* Use the type of process. */ newcontext.type = scontext->type; } else { /* Use the type of the related object. */ newcontext.type = tcontext->type; } } /* Look for a type transition/member/change rule. */ avkey.source_type = scontext->type; avkey.target_type = tcontext->type; avkey.target_class = tclass; avkey.specified = specified; avdatum = avtab_search(&policydb->te_avtab, &avkey); /* If no permanent rule, also check for enabled conditional rules */ if (!avdatum) { node = avtab_search_node(&policydb->te_cond_avtab, &avkey); for (; node; node = avtab_search_node_next(node, specified)) { if (node->key.specified & AVTAB_ENABLED) { avdatum = &node->datum; break; } } } if (avdatum) { /* Use the type from the type transition/member/change rule. */ newcontext.type = avdatum->u.data; } /* if we have a objname this is a file trans check so check those rules */ if (objname) filename_compute_type(policydb, &newcontext, scontext->type, tcontext->type, tclass, objname); /* Check for class-specific changes. */ if (specified & AVTAB_TRANSITION) { /* Look for a role transition rule. */ for (roletr = policydb->role_tr; roletr; roletr = roletr->next) { if ((roletr->role == scontext->role) && (roletr->type == tcontext->type) && (roletr->tclass == tclass)) { /* Use the role transition rule. */ newcontext.role = roletr->new_role; break; } } } /* Set the MLS attributes. This is done last because it may allocate memory. */ rc = mls_compute_sid(policydb, scontext, tcontext, tclass, specified, &newcontext, sock); if (rc) goto out_unlock; /* Check the validity of the context. */ if (!policydb_context_isvalid(policydb, &newcontext)) { rc = compute_sid_handle_invalid_context(state, scontext, tcontext, tclass, &newcontext); if (rc) goto out_unlock; } /* Obtain the sid for the context. */ rc = sidtab_context_to_sid(sidtab, &newcontext, out_sid); out_unlock: read_unlock(&state->ss->policy_rwlock); context_destroy(&newcontext); out: return rc; } /** * security_transition_sid - Compute the SID for a new subject/object. * @ssid: source security identifier * @tsid: target security identifier * @tclass: target security class * @out_sid: security identifier for new subject/object * * Compute a SID to use for labeling a new subject or object in the * class @tclass based on a SID pair (@ssid, @tsid). * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM * if insufficient memory is available, or %0 if the new SID was * computed successfully. */ int security_transition_sid(struct selinux_state *state, u32 ssid, u32 tsid, u16 tclass, const struct qstr *qstr, u32 *out_sid) { return security_compute_sid(state, ssid, tsid, tclass, AVTAB_TRANSITION, qstr ? qstr->name : NULL, out_sid, true); } int security_transition_sid_user(struct selinux_state *state, u32 ssid, u32 tsid, u16 tclass, const char *objname, u32 *out_sid) { return security_compute_sid(state, ssid, tsid, tclass, AVTAB_TRANSITION, objname, out_sid, false); } /** * security_member_sid - Compute the SID for member selection. * @ssid: source security identifier * @tsid: target security identifier * @tclass: target security class * @out_sid: security identifier for selected member * * Compute a SID to use when selecting a member of a polyinstantiated * object of class @tclass based on a SID pair (@ssid, @tsid). * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM * if insufficient memory is available, or %0 if the SID was * computed successfully. */ int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid, u16 tclass, u32 *out_sid) { return security_compute_sid(state, ssid, tsid, tclass, AVTAB_MEMBER, NULL, out_sid, false); } /** * security_change_sid - Compute the SID for object relabeling. * @ssid: source security identifier * @tsid: target security identifier * @tclass: target security class * @out_sid: security identifier for selected member * * Compute a SID to use for relabeling an object of class @tclass * based on a SID pair (@ssid, @tsid). * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM * if insufficient memory is available, or %0 if the SID was * computed successfully. */ int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid, u16 tclass, u32 *out_sid) { return security_compute_sid(state, ssid, tsid, tclass, AVTAB_CHANGE, NULL, out_sid, false); } /* Clone the SID into the new SID table. */ static int clone_sid(u32 sid, struct context *context, void *arg) { struct sidtab *s = arg; if (sid > SECINITSID_NUM) return sidtab_insert(s, sid, context); else return 0; } static inline int convert_context_handle_invalid_context( struct selinux_state *state, struct context *context) { struct policydb *policydb = &state->ss->policydb; char *s; u32 len; if (enforcing_enabled(state)) return -EINVAL; if (!context_struct_to_string(policydb, context, &s, &len)) { pr_warn("SELinux: Context %s would be invalid if enforcing\n", s); kfree(s); } return 0; } struct convert_context_args { struct selinux_state *state; struct policydb *oldp; struct policydb *newp; }; /* * Convert the values in the security context * structure `c' from the values specified * in the policy `p->oldp' to the values specified * in the policy `p->newp'. Verify that the * context is valid under the new policy. */ static int convert_context(u32 key, struct context *c, void *p) { struct convert_context_args *args; struct context oldc; struct ocontext *oc; struct mls_range *range; struct role_datum *role; struct type_datum *typdatum; struct user_datum *usrdatum; char *s; u32 len; int rc = 0; if (key <= SECINITSID_NUM) goto out; args = p; if (c->str) { struct context ctx; rc = -ENOMEM; s = kstrdup(c->str, GFP_KERNEL); if (!s) goto out; rc = string_to_context_struct(args->newp, NULL, s, &ctx, SECSID_NULL); kfree(s); if (!rc) { pr_info("SELinux: Context %s became valid (mapped).\n", c->str); /* Replace string with mapped representation. */ kfree(c->str); memcpy(c, &ctx, sizeof(*c)); goto out; } else if (rc == -EINVAL) { /* Retain string representation for later mapping. */ rc = 0; goto out; } else { /* Other error condition, e.g. ENOMEM. */ pr_err("SELinux: Unable to map context %s, rc = %d.\n", c->str, -rc); goto out; } } rc = context_cpy(&oldc, c); if (rc) goto out; /* Convert the user. */ rc = -EINVAL; usrdatum = hashtab_search(args->newp->p_users.table, sym_name(args->oldp, SYM_USERS, c->user - 1)); if (!usrdatum) goto bad; c->user = usrdatum->value; /* Convert the role. */ rc = -EINVAL; role = hashtab_search(args->newp->p_roles.table, sym_name(args->oldp, SYM_ROLES, c->role - 1)); if (!role) goto bad; c->role = role->value; /* Convert the type. */ rc = -EINVAL; typdatum = hashtab_search(args->newp->p_types.table, sym_name(args->oldp, SYM_TYPES, c->type - 1)); if (!typdatum) goto bad; c->type = typdatum->value; /* Convert the MLS fields if dealing with MLS policies */ if (args->oldp->mls_enabled && args->newp->mls_enabled) { rc = mls_convert_context(args->oldp, args->newp, c); if (rc) goto bad; } else if (args->oldp->mls_enabled && !args->newp->mls_enabled) { /* * Switching between MLS and non-MLS policy: * free any storage used by the MLS fields in the * context for all existing entries in the sidtab. */ mls_context_destroy(c); } else if (!args->oldp->mls_enabled && args->newp->mls_enabled) { /* * Switching between non-MLS and MLS policy: * ensure that the MLS fields of the context for all * existing entries in the sidtab are filled in with a * suitable default value, likely taken from one of the * initial SIDs. */ oc = args->newp->ocontexts[OCON_ISID]; while (oc && oc->sid[0] != SECINITSID_UNLABELED) oc = oc->next; rc = -EINVAL; if (!oc) { pr_err("SELinux: unable to look up" " the initial SIDs list\n"); goto bad; } range = &oc->context[0].range; rc = mls_range_set(c, range); if (rc) goto bad; } /* Check the validity of the new context. */ if (!policydb_context_isvalid(args->newp, c)) { rc = convert_context_handle_invalid_context(args->state, &oldc); if (rc) goto bad; } context_destroy(&oldc); rc = 0; out: return rc; bad: /* Map old representation to string and save it. */ rc = context_struct_to_string(args->oldp, &oldc, &s, &len); if (rc) return rc; context_destroy(&oldc); context_destroy(c); c->str = s; c->len = len; pr_info("SELinux: Context %s became invalid (unmapped).\n", c->str); rc = 0; goto out; } static void security_load_policycaps(struct selinux_state *state) { struct policydb *p = &state->ss->policydb; unsigned int i; struct ebitmap_node *node; for (i = 0; i < ARRAY_SIZE(state->policycap); i++) state->policycap[i] = ebitmap_get_bit(&p->policycaps, i); for (i = 0; i < ARRAY_SIZE(selinux_policycap_names); i++) pr_info("SELinux: policy capability %s=%d\n", selinux_policycap_names[i], ebitmap_get_bit(&p->policycaps, i)); ebitmap_for_each_positive_bit(&p->policycaps, node, i) { if (i >= ARRAY_SIZE(selinux_policycap_names)) pr_info("SELinux: unknown policy capability %u\n", i); } } static int security_preserve_bools(struct selinux_state *state, struct policydb *newpolicydb); /** * security_load_policy - Load a security policy configuration. * @data: binary policy data * @len: length of data in bytes * * Load a new set of security policy configuration data, * validate it and convert the SID table as necessary. * This function will flush the access vector cache after * loading the new policy. */ int security_load_policy(struct selinux_state *state, void *data, size_t len) { struct policydb *policydb; struct sidtab *sidtab; struct policydb *oldpolicydb, *newpolicydb; struct sidtab oldsidtab, newsidtab; struct selinux_mapping *oldmapping; struct selinux_map newmap; struct convert_context_args args; u32 seqno; int rc = 0; struct policy_file file = { data, len }, *fp = &file; oldpolicydb = kcalloc(2, sizeof(*oldpolicydb), GFP_KERNEL); if (!oldpolicydb) { rc = -ENOMEM; goto out; } newpolicydb = oldpolicydb + 1; policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; if (!state->initialized) { rc = policydb_read(policydb, fp); if (rc) goto out; policydb->len = len; rc = selinux_set_mapping(policydb, secclass_map, &state->ss->map); if (rc) { policydb_destroy(policydb); goto out; } rc = policydb_load_isids(policydb, sidtab); if (rc) { policydb_destroy(policydb); goto out; } security_load_policycaps(state); state->initialized = 1; seqno = ++state->ss->latest_granting; selinux_complete_init(); avc_ss_reset(state->avc, seqno); selnl_notify_policyload(seqno); selinux_status_update_policyload(state, seqno); selinux_netlbl_cache_invalidate(); selinux_xfrm_notify_policyload(); goto out; } #if 0 sidtab_hash_eval(sidtab, "sids"); #endif rc = policydb_read(newpolicydb, fp); if (rc) goto out; newpolicydb->len = len; /* If switching between different policy types, log MLS status */ if (policydb->mls_enabled && !newpolicydb->mls_enabled) pr_info("SELinux: Disabling MLS support...\n"); else if (!policydb->mls_enabled && newpolicydb->mls_enabled) pr_info("SELinux: Enabling MLS support...\n"); rc = policydb_load_isids(newpolicydb, &newsidtab); if (rc) { pr_err("SELinux: unable to load the initial SIDs\n"); policydb_destroy(newpolicydb); goto out; } rc = selinux_set_mapping(newpolicydb, secclass_map, &newmap); if (rc) goto err; rc = security_preserve_bools(state, newpolicydb); if (rc) { pr_err("SELinux: unable to preserve booleans\n"); goto err; } /* Clone the SID table. */ sidtab_shutdown(sidtab); rc = sidtab_map(sidtab, clone_sid, &newsidtab); if (rc) goto err; /* * Convert the internal representations of contexts * in the new SID table. */ args.state = state; args.oldp = policydb; args.newp = newpolicydb; rc = sidtab_map(&newsidtab, convert_context, &args); if (rc) { pr_err("SELinux: unable to convert the internal" " representation of contexts in the new SID" " table\n"); goto err; } /* Save the old policydb and SID table to free later. */ memcpy(oldpolicydb, policydb, sizeof(*policydb)); sidtab_set(&oldsidtab, sidtab); /* Install the new policydb and SID table. */ write_lock_irq(&state->ss->policy_rwlock); memcpy(policydb, newpolicydb, sizeof(*policydb)); sidtab_set(sidtab, &newsidtab); security_load_policycaps(state); oldmapping = state->ss->map.mapping; state->ss->map.mapping = newmap.mapping; state->ss->map.size = newmap.size; seqno = ++state->ss->latest_granting; write_unlock_irq(&state->ss->policy_rwlock); /* Free the old policydb and SID table. */ policydb_destroy(oldpolicydb); sidtab_destroy(&oldsidtab); kfree(oldmapping); avc_ss_reset(state->avc, seqno); selnl_notify_policyload(seqno); selinux_status_update_policyload(state, seqno); selinux_netlbl_cache_invalidate(); selinux_xfrm_notify_policyload(); rc = 0; goto out; err: kfree(newmap.mapping); sidtab_destroy(&newsidtab); policydb_destroy(newpolicydb); out: kfree(oldpolicydb); return rc; } size_t security_policydb_len(struct selinux_state *state) { struct policydb *p = &state->ss->policydb; size_t len; read_lock(&state->ss->policy_rwlock); len = p->len; read_unlock(&state->ss->policy_rwlock); return len; } /** * security_port_sid - Obtain the SID for a port. * @protocol: protocol number * @port: port number * @out_sid: security identifier */ int security_port_sid(struct selinux_state *state, u8 protocol, u16 port, u32 *out_sid) { struct policydb *policydb; struct sidtab *sidtab; struct ocontext *c; int rc = 0; read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; c = policydb->ocontexts[OCON_PORT]; while (c) { if (c->u.port.protocol == protocol && c->u.port.low_port <= port && c->u.port.high_port >= port) break; c = c->next; } if (c) { if (!c->sid[0]) { rc = sidtab_context_to_sid(sidtab, &c->context[0], &c->sid[0]); if (rc) goto out; } *out_sid = c->sid[0]; } else { *out_sid = SECINITSID_PORT; } out: read_unlock(&state->ss->policy_rwlock); return rc; } /** * security_pkey_sid - Obtain the SID for a pkey. * @subnet_prefix: Subnet Prefix * @pkey_num: pkey number * @out_sid: security identifier */ int security_ib_pkey_sid(struct selinux_state *state, u64 subnet_prefix, u16 pkey_num, u32 *out_sid) { struct policydb *policydb; struct sidtab *sidtab; struct ocontext *c; int rc = 0; read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; c = policydb->ocontexts[OCON_IBPKEY]; while (c) { if (c->u.ibpkey.low_pkey <= pkey_num && c->u.ibpkey.high_pkey >= pkey_num && c->u.ibpkey.subnet_prefix == subnet_prefix) break; c = c->next; } if (c) { if (!c->sid[0]) { rc = sidtab_context_to_sid(sidtab, &c->context[0], &c->sid[0]); if (rc) goto out; } *out_sid = c->sid[0]; } else *out_sid = SECINITSID_UNLABELED; out: read_unlock(&state->ss->policy_rwlock); return rc; } /** * security_ib_endport_sid - Obtain the SID for a subnet management interface. * @dev_name: device name * @port: port number * @out_sid: security identifier */ int security_ib_endport_sid(struct selinux_state *state, const char *dev_name, u8 port_num, u32 *out_sid) { struct policydb *policydb; struct sidtab *sidtab; struct ocontext *c; int rc = 0; read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; c = policydb->ocontexts[OCON_IBENDPORT]; while (c) { if (c->u.ibendport.port == port_num && !strncmp(c->u.ibendport.dev_name, dev_name, IB_DEVICE_NAME_MAX)) break; c = c->next; } if (c) { if (!c->sid[0]) { rc = sidtab_context_to_sid(sidtab, &c->context[0], &c->sid[0]); if (rc) goto out; } *out_sid = c->sid[0]; } else *out_sid = SECINITSID_UNLABELED; out: read_unlock(&state->ss->policy_rwlock); return rc; } /** * security_netif_sid - Obtain the SID for a network interface. * @name: interface name * @if_sid: interface SID */ int security_netif_sid(struct selinux_state *state, char *name, u32 *if_sid) { struct policydb *policydb; struct sidtab *sidtab; int rc = 0; struct ocontext *c; read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; c = policydb->ocontexts[OCON_NETIF]; while (c) { if (strcmp(name, c->u.name) == 0) break; c = c->next; } if (c) { if (!c->sid[0] || !c->sid[1]) { rc = sidtab_context_to_sid(sidtab, &c->context[0], &c->sid[0]); if (rc) goto out; rc = sidtab_context_to_sid(sidtab, &c->context[1], &c->sid[1]); if (rc) goto out; } *if_sid = c->sid[0]; } else *if_sid = SECINITSID_NETIF; out: read_unlock(&state->ss->policy_rwlock); return rc; } static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) { int i, fail = 0; for (i = 0; i < 4; i++) if (addr[i] != (input[i] & mask[i])) { fail = 1; break; } return !fail; } /** * security_node_sid - Obtain the SID for a node (host). * @domain: communication domain aka address family * @addrp: address * @addrlen: address length in bytes * @out_sid: security identifier */ int security_node_sid(struct selinux_state *state, u16 domain, void *addrp, u32 addrlen, u32 *out_sid) { struct policydb *policydb; struct sidtab *sidtab; int rc; struct ocontext *c; read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; switch (domain) { case AF_INET: { u32 addr; rc = -EINVAL; if (addrlen != sizeof(u32)) goto out; addr = *((u32 *)addrp); c = policydb->ocontexts[OCON_NODE]; while (c) { if (c->u.node.addr == (addr & c->u.node.mask)) break; c = c->next; } break; } case AF_INET6: rc = -EINVAL; if (addrlen != sizeof(u64) * 2) goto out; c = policydb->ocontexts[OCON_NODE6]; while (c) { if (match_ipv6_addrmask(addrp, c->u.node6.addr, c->u.node6.mask)) break; c = c->next; } break; default: rc = 0; *out_sid = SECINITSID_NODE; goto out; } if (c) { if (!c->sid[0]) { rc = sidtab_context_to_sid(sidtab, &c->context[0], &c->sid[0]); if (rc) goto out; } *out_sid = c->sid[0]; } else { *out_sid = SECINITSID_NODE; } rc = 0; out: read_unlock(&state->ss->policy_rwlock); return rc; } #define SIDS_NEL 25 /** * security_get_user_sids - Obtain reachable SIDs for a user. * @fromsid: starting SID * @username: username * @sids: array of reachable SIDs for user * @nel: number of elements in @sids * * Generate the set of SIDs for legal security contexts * for a given user that can be reached by @fromsid. * Set *@sids to point to a dynamically allocated * array containing the set of SIDs. Set *@nel to the * number of elements in the array. */ int security_get_user_sids(struct selinux_state *state, u32 fromsid, char *username, u32 **sids, u32 *nel) { struct policydb *policydb; struct sidtab *sidtab; struct context *fromcon, usercon; u32 *mysids = NULL, *mysids2, sid; u32 mynel = 0, maxnel = SIDS_NEL; struct user_datum *user; struct role_datum *role; struct ebitmap_node *rnode, *tnode; int rc = 0, i, j; *sids = NULL; *nel = 0; if (!state->initialized) goto out; read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; context_init(&usercon); rc = -EINVAL; fromcon = sidtab_search(sidtab, fromsid); if (!fromcon) goto out_unlock; rc = -EINVAL; user = hashtab_search(policydb->p_users.table, username); if (!user) goto out_unlock; usercon.user = user->value; rc = -ENOMEM; mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); if (!mysids) goto out_unlock; ebitmap_for_each_positive_bit(&user->roles, rnode, i) { role = policydb->role_val_to_struct[i]; usercon.role = i + 1; ebitmap_for_each_positive_bit(&role->types, tnode, j) { usercon.type = j + 1; if (mls_setup_user_range(policydb, fromcon, user, &usercon)) continue; rc = sidtab_context_to_sid(sidtab, &usercon, &sid); if (rc) goto out_unlock; if (mynel < maxnel) { mysids[mynel++] = sid; } else { rc = -ENOMEM; maxnel += SIDS_NEL; mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); if (!mysids2) goto out_unlock; memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); kfree(mysids); mysids = mysids2; mysids[mynel++] = sid; } } } rc = 0; out_unlock: read_unlock(&state->ss->policy_rwlock); if (rc || !mynel) { kfree(mysids); goto out; } rc = -ENOMEM; mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL); if (!mysids2) { kfree(mysids); goto out; } for (i = 0, j = 0; i < mynel; i++) { struct av_decision dummy_avd; rc = avc_has_perm_noaudit(state, fromsid, mysids[i], SECCLASS_PROCESS, /* kernel value */ PROCESS__TRANSITION, AVC_STRICT, &dummy_avd); if (!rc) mysids2[j++] = mysids[i]; cond_resched(); } rc = 0; kfree(mysids); *sids = mysids2; *nel = j; out: return rc; } /** * __security_genfs_sid - Helper to obtain a SID for a file in a filesystem * @fstype: filesystem type * @path: path from root of mount * @sclass: file security class * @sid: SID for path * * Obtain a SID to use for a file in a filesystem that * cannot support xattr or use a fixed labeling behavior like * transition SIDs or task SIDs. * * The caller must acquire the policy_rwlock before calling this function. */ static inline int __security_genfs_sid(struct selinux_state *state, const char *fstype, char *path, u16 orig_sclass, u32 *sid) { struct policydb *policydb = &state->ss->policydb; struct sidtab *sidtab = &state->ss->sidtab; int len; u16 sclass; struct genfs *genfs; struct ocontext *c; int rc, cmp = 0; while (path[0] == '/' && path[1] == '/') path++; sclass = unmap_class(&state->ss->map, orig_sclass); *sid = SECINITSID_UNLABELED; for (genfs = policydb->genfs; genfs; genfs = genfs->next) { cmp = strcmp(fstype, genfs->fstype); if (cmp <= 0) break; } rc = -ENOENT; if (!genfs || cmp) goto out; for (c = genfs->head; c; c = c->next) { len = strlen(c->u.name); if ((!c->v.sclass || sclass == c->v.sclass) && (strncmp(c->u.name, path, len) == 0)) break; } rc = -ENOENT; if (!c) goto out; if (!c->sid[0]) { rc = sidtab_context_to_sid(sidtab, &c->context[0], &c->sid[0]); if (rc) goto out; } *sid = c->sid[0]; rc = 0; out: return rc; } /** * security_genfs_sid - Obtain a SID for a file in a filesystem * @fstype: filesystem type * @path: path from root of mount * @sclass: file security class * @sid: SID for path * * Acquire policy_rwlock before calling __security_genfs_sid() and release * it afterward. */ int security_genfs_sid(struct selinux_state *state, const char *fstype, char *path, u16 orig_sclass, u32 *sid) { int retval; read_lock(&state->ss->policy_rwlock); retval = __security_genfs_sid(state, fstype, path, orig_sclass, sid); read_unlock(&state->ss->policy_rwlock); return retval; } /** * security_fs_use - Determine how to handle labeling for a filesystem. * @sb: superblock in question */ int security_fs_use(struct selinux_state *state, struct super_block *sb) { struct policydb *policydb; struct sidtab *sidtab; int rc = 0; struct ocontext *c; struct superblock_security_struct *sbsec = sb->s_security; const char *fstype = sb->s_type->name; read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; sidtab = &state->ss->sidtab; c = policydb->ocontexts[OCON_FSUSE]; while (c) { if (strcmp(fstype, c->u.name) == 0) break; c = c->next; } if (c) { sbsec->behavior = c->v.behavior; if (!c->sid[0]) { rc = sidtab_context_to_sid(sidtab, &c->context[0], &c->sid[0]); if (rc) goto out; } sbsec->sid = c->sid[0]; } else { rc = __security_genfs_sid(state, fstype, "/", SECCLASS_DIR, &sbsec->sid); if (rc) { sbsec->behavior = SECURITY_FS_USE_NONE; rc = 0; } else { sbsec->behavior = SECURITY_FS_USE_GENFS; } } out: read_unlock(&state->ss->policy_rwlock); return rc; } int security_get_bools(struct selinux_state *state, int *len, char ***names, int **values) { struct policydb *policydb; int i, rc; if (!state->initialized) { *len = 0; *names = NULL; *values = NULL; return 0; } read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; *names = NULL; *values = NULL; rc = 0; *len = policydb->p_bools.nprim; if (!*len) goto out; rc = -ENOMEM; *names = kcalloc(*len, sizeof(char *), GFP_ATOMIC); if (!*names) goto err; rc = -ENOMEM; *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); if (!*values) goto err; for (i = 0; i < *len; i++) { (*values)[i] = policydb->bool_val_to_struct[i]->state; rc = -ENOMEM; (*names)[i] = kstrdup(sym_name(policydb, SYM_BOOLS, i), GFP_ATOMIC); if (!(*names)[i]) goto err; } rc = 0; out: read_unlock(&state->ss->policy_rwlock); return rc; err: if (*names) { for (i = 0; i < *len; i++) kfree((*names)[i]); } kfree(*values); goto out; } int security_set_bools(struct selinux_state *state, int len, int *values) { struct policydb *policydb; int i, rc; int lenp, seqno = 0; struct cond_node *cur; write_lock_irq(&state->ss->policy_rwlock); policydb = &state->ss->policydb; rc = -EFAULT; lenp = policydb->p_bools.nprim; if (len != lenp) goto out; for (i = 0; i < len; i++) { if (!!values[i] != policydb->bool_val_to_struct[i]->state) { audit_log(audit_context(), GFP_ATOMIC, AUDIT_MAC_CONFIG_CHANGE, "bool=%s val=%d old_val=%d auid=%u ses=%u", sym_name(policydb, SYM_BOOLS, i), !!values[i], policydb->bool_val_to_struct[i]->state, from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); } if (values[i]) policydb->bool_val_to_struct[i]->state = 1; else policydb->bool_val_to_struct[i]->state = 0; } for (cur = policydb->cond_list; cur; cur = cur->next) { rc = evaluate_cond_node(policydb, cur); if (rc) goto out; } seqno = ++state->ss->latest_granting; rc = 0; out: write_unlock_irq(&state->ss->policy_rwlock); if (!rc) { avc_ss_reset(state->avc, seqno); selnl_notify_policyload(seqno); selinux_status_update_policyload(state, seqno); selinux_xfrm_notify_policyload(); } return rc; } int security_get_bool_value(struct selinux_state *state, int index) { struct policydb *policydb; int rc; int len; read_lock(&state->ss->policy_rwlock); policydb = &state->ss->policydb; rc = -EFAULT; len = policydb->p_bools.nprim; if (index >= len) goto out; rc = policydb->bool_val_to_struct[index]->state; out: read_unlock(&state->ss->policy_rwlock); return rc; } static int security_preserve_bools(struct selinux_state *state, struct policydb *policydb) { int rc, nbools = 0, *bvalues = NULL, i; char **bnames = NULL; struct cond_bool_datum *booldatum; struct cond_node *cur; rc = security_get_bools(state, &nbools, &bnames, &bvalues); if (rc) goto out; for (i = 0; i < nbools; i++) { booldatum = hashtab_search(policydb->p_bools.table, bnames[i]); if (booldatum) booldatum->state = bvalues[i]; } for (cur = policydb->cond_list; cur; cur = cur->next) { rc = evaluate_cond_node(policydb, cur); if (rc) goto out; } out: if (bnames) { for (i = 0; i < nbools; i++) kfree(bnames[i]); } kfree(bnames); kfree(bvalues); return rc; } /* * security_sid_mls_copy() - computes a new sid based on the given * sid and the mls portion of mls_sid. */ int security_sid_mls_copy(struct selinux_state *state, u32 sid, u32 mls_sid, u32 *new_sid) { struct policydb *policydb = &state->ss->policydb; struct sidtab *sidtab = &state->ss->sidtab; struct context *context1; struct context *context2; struct context newcon; char *s; u32 len; int rc; rc = 0; if (!state->initialized || !policydb->mls_enabled) { *new_sid = sid; goto out; } context_init(&newcon); read_lock(&state->ss->policy_rwlock); rc = -EINVAL; context1 = sidtab_search(sidtab, sid); if (!context1) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, sid); goto out_unlock; } rc = -EINVAL; context2 = sidtab_search(sidtab, mls_sid); if (!context2) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, mls_sid); goto out_unlock; } newcon.user = context1->user; newcon.role = context1->role; newcon.type = context1->type; rc = mls_context_cpy(&newcon, context2); if (rc) goto out_unlock; /* Check the validity of the new context. */ if (!policydb_context_isvalid(policydb, &newcon)) { rc = convert_context_handle_invalid_context(state, &newcon); if (rc) { if (!context_struct_to_string(policydb, &newcon, &s, &len)) { audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR, "op=security_sid_mls_copy " "invalid_context=%s", s); kfree(s); } goto out_unlock; } } rc = sidtab_context_to_sid(sidtab, &newcon, new_sid); out_unlock: read_unlock(&state->ss->policy_rwlock); context_destroy(&newcon); out: return rc; } /** * security_net_peersid_resolve - Compare and resolve two network peer SIDs * @nlbl_sid: NetLabel SID * @nlbl_type: NetLabel labeling protocol type * @xfrm_sid: XFRM SID * * Description: * Compare the @nlbl_sid and @xfrm_sid values and if the two SIDs can be * resolved into a single SID it is returned via @peer_sid and the function * returns zero. Otherwise @peer_sid is set to SECSID_NULL and the function * returns a negative value. A table summarizing the behavior is below: * * | function return | @sid * ------------------------------+-----------------+----------------- * no peer labels | 0 | SECSID_NULL * single peer label | 0 | <peer_label> * multiple, consistent labels | 0 | <peer_label> * multiple, inconsistent labels | -<errno> | SECSID_NULL * */ int security_net_peersid_resolve(struct selinux_state *state, u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid, u32 *peer_sid) { struct policydb *policydb = &state->ss->policydb; struct sidtab *sidtab = &state->ss->sidtab; int rc; struct context *nlbl_ctx; struct context *xfrm_ctx; *peer_sid = SECSID_NULL; /* handle the common (which also happens to be the set of easy) cases * right away, these two if statements catch everything involving a * single or absent peer SID/label */ if (xfrm_sid == SECSID_NULL) { *peer_sid = nlbl_sid; return 0; } /* NOTE: an nlbl_type == NETLBL_NLTYPE_UNLABELED is a "fallback" label * and is treated as if nlbl_sid == SECSID_NULL when a XFRM SID/label * is present */ if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) { *peer_sid = xfrm_sid; return 0; } /* * We don't need to check initialized here since the only way both * nlbl_sid and xfrm_sid are not equal to SECSID_NULL would be if the * security server was initialized and state->initialized was true. */ if (!policydb->mls_enabled) return 0; read_lock(&state->ss->policy_rwlock); rc = -EINVAL; nlbl_ctx = sidtab_search(sidtab, nlbl_sid); if (!nlbl_ctx) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, nlbl_sid); goto out; } rc = -EINVAL; xfrm_ctx = sidtab_search(sidtab, xfrm_sid); if (!xfrm_ctx) { pr_err("SELinux: %s: unrecognized SID %d\n", __func__, xfrm_sid); goto out; } rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES); if (rc) goto out; /* at present NetLabel SIDs/labels really only carry MLS * information so if the MLS portion of the NetLabel SID * matches the MLS portion of the labeled XFRM SID/label * then pass along the XFRM SID as it is the most * expressive */ *peer_sid = xfrm_sid; out: read_unlock(&state->ss->policy_rwlock); return rc; } static int get_classes_callback(void *k, void *d, void *args) { struct class_datum *datum = d; char *name = k, **classes = args; int value = datum->value - 1; classes[value] = kstrdup(name, GFP_ATOMIC); if (!classes[value]) return -ENOMEM; return 0; } int security_get_classes(struct selinux_state *state, char ***classes, int *nclasses) { struct policydb *policydb = &state->ss->policydb; int rc; if (!state->initialized) { *nclasses = 0; *classes = NULL; return 0; } read_lock(&state->ss->policy_rwlock); rc = -ENOMEM; *nclasses = policydb->p_classes.nprim; *classes = kcalloc(*nclasses, sizeof(**classes), GFP_ATOMIC); if (!*classes) goto out; rc = hashtab_map(policydb->p_classes.table, get_classes_callback, *classes); if (rc) { int i; for (i = 0; i < *nclasses; i++) kfree((*classes)[i]); kfree(*classes); } out: read_unlock(&state->ss->policy_rwlock); return rc; } static int get_permissions_callback(void *k, void *d, void *args) { struct perm_datum *datum = d; char *name = k, **perms = args; int value = datum->value - 1; perms[value] = kstrdup(name, GFP_ATOMIC); if (!perms[value]) return -ENOMEM; return 0; } int security_get_permissions(struct selinux_state *state, char *class, char ***perms, int *nperms) { struct policydb *policydb = &state->ss->policydb; int rc, i; struct class_datum *match; read_lock(&state->ss->policy_rwlock); rc = -EINVAL; match = hashtab_search(policydb->p_classes.table, class); if (!match) { pr_err("SELinux: %s: unrecognized class %s\n", __func__, class); goto out; } rc = -ENOMEM; *nperms = match->permissions.nprim; *perms = kcalloc(*nperms, sizeof(**perms), GFP_ATOMIC); if (!*perms) goto out; if (match->comdatum) { rc = hashtab_map(match->comdatum->permissions.table, get_permissions_callback, *perms); if (rc) goto err; } rc = hashtab_map(match->permissions.table, get_permissions_callback, *perms); if (rc) goto err; out: read_unlock(&state->ss->policy_rwlock); return rc; err: read_unlock(&state->ss->policy_rwlock); for (i = 0; i < *nperms; i++) kfree((*perms)[i]); kfree(*perms); return rc; } int security_get_reject_unknown(struct selinux_state *state) { return state->ss->policydb.reject_unknown; } int security_get_allow_unknown(struct selinux_state *state) { return state->ss->policydb.allow_unknown; } /** * security_policycap_supported - Check for a specific policy capability * @req_cap: capability * * Description: * This function queries the currently loaded policy to see if it supports the * capability specified by @req_cap. Returns true (1) if the capability is * supported, false (0) if it isn't supported. * */ int security_policycap_supported(struct selinux_state *state, unsigned int req_cap) { struct policydb *policydb = &state->ss->policydb; int rc; read_lock(&state->ss->policy_rwlock); rc = ebitmap_get_bit(&policydb->policycaps, req_cap); read_unlock(&state->ss->policy_rwlock); return rc; } struct selinux_audit_rule { u32 au_seqno; struct context au_ctxt; }; void selinux_audit_rule_free(void *vrule) { struct selinux_audit_rule *rule = vrule; if (rule) { context_destroy(&rule->au_ctxt); kfree(rule); } } int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) { struct selinux_state *state = &selinux_state; struct policydb *policydb = &state->ss->policydb; struct selinux_audit_rule *tmprule; struct role_datum *roledatum; struct type_datum *typedatum; struct user_datum *userdatum; struct selinux_audit_rule **rule = (struct selinux_audit_rule **)vrule; int rc = 0; *rule = NULL; if (!state->initialized) return -EOPNOTSUPP; switch (field) { case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_OBJ_USER: case AUDIT_OBJ_ROLE: case AUDIT_OBJ_TYPE: /* only 'equals' and 'not equals' fit user, role, and type */ if (op != Audit_equal && op != Audit_not_equal) return -EINVAL; break; case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: /* we do not allow a range, indicated by the presence of '-' */ if (strchr(rulestr, '-')) return -EINVAL; break; default: /* only the above fields are valid */ return -EINVAL; } tmprule = kzalloc(sizeof(struct selinux_audit_rule), GFP_KERNEL); if (!tmprule) return -ENOMEM; context_init(&tmprule->au_ctxt); read_lock(&state->ss->policy_rwlock); tmprule->au_seqno = state->ss->latest_granting; switch (field) { case AUDIT_SUBJ_USER: case AUDIT_OBJ_USER: rc = -EINVAL; userdatum = hashtab_search(policydb->p_users.table, rulestr); if (!userdatum) goto out; tmprule->au_ctxt.user = userdatum->value; break; case AUDIT_SUBJ_ROLE: case AUDIT_OBJ_ROLE: rc = -EINVAL; roledatum = hashtab_search(policydb->p_roles.table, rulestr); if (!roledatum) goto out; tmprule->au_ctxt.role = roledatum->value; break; case AUDIT_SUBJ_TYPE: case AUDIT_OBJ_TYPE: rc = -EINVAL; typedatum = hashtab_search(policydb->p_types.table, rulestr); if (!typedatum) goto out; tmprule->au_ctxt.type = typedatum->value; break; case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: rc = mls_from_string(policydb, rulestr, &tmprule->au_ctxt, GFP_ATOMIC); if (rc) goto out; break; } rc = 0; out: read_unlock(&state->ss->policy_rwlock); if (rc) { selinux_audit_rule_free(tmprule); tmprule = NULL; } *rule = tmprule; return rc; } /* Check to see if the rule contains any selinux fields */ int selinux_audit_rule_known(struct audit_krule *rule) { int i; for (i = 0; i < rule->field_count; i++) { struct audit_field *f = &rule->fields[i]; switch (f->type) { case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: case AUDIT_OBJ_USER: case AUDIT_OBJ_ROLE: case AUDIT_OBJ_TYPE: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: return 1; } } return 0; } int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, struct audit_context *actx) { struct selinux_state *state = &selinux_state; struct context *ctxt; struct mls_level *level; struct selinux_audit_rule *rule = vrule; int match = 0; if (unlikely(!rule)) { WARN_ONCE(1, "selinux_audit_rule_match: missing rule\n"); return -ENOENT; } read_lock(&state->ss->policy_rwlock); if (rule->au_seqno < state->ss->latest_granting) { match = -ESTALE; goto out; } ctxt = sidtab_search(&state->ss->sidtab, sid); if (unlikely(!ctxt)) { WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n", sid); match = -ENOENT; goto out; } /* a field/op pair that is not caught here will simply fall through without a match */ switch (field) { case AUDIT_SUBJ_USER: case AUDIT_OBJ_USER: switch (op) { case Audit_equal: match = (ctxt->user == rule->au_ctxt.user); break; case Audit_not_equal: match = (ctxt->user != rule->au_ctxt.user); break; } break; case AUDIT_SUBJ_ROLE: case AUDIT_OBJ_ROLE: switch (op) { case Audit_equal: match = (ctxt->role == rule->au_ctxt.role); break; case Audit_not_equal: match = (ctxt->role != rule->au_ctxt.role); break; } break; case AUDIT_SUBJ_TYPE: case AUDIT_OBJ_TYPE: switch (op) { case Audit_equal: match = (ctxt->type == rule->au_ctxt.type); break; case Audit_not_equal: match = (ctxt->type != rule->au_ctxt.type); break; } break; case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: level = ((field == AUDIT_SUBJ_SEN || field == AUDIT_OBJ_LEV_LOW) ? &ctxt->range.level[0] : &ctxt->range.level[1]); switch (op) { case Audit_equal: match = mls_level_eq(&rule->au_ctxt.range.level[0], level); break; case Audit_not_equal: match = !mls_level_eq(&rule->au_ctxt.range.level[0], level); break; case Audit_lt: match = (mls_level_dom(&rule->au_ctxt.range.level[0], level) && !mls_level_eq(&rule->au_ctxt.range.level[0], level)); break; case Audit_le: match = mls_level_dom(&rule->au_ctxt.range.level[0], level); break; case Audit_gt: match = (mls_level_dom(level, &rule->au_ctxt.range.level[0]) && !mls_level_eq(level, &rule->au_ctxt.range.level[0])); break; case Audit_ge: match = mls_level_dom(level, &rule->au_ctxt.range.level[0]); break; } } out: read_unlock(&state->ss->policy_rwlock); return match; } static int (*aurule_callback)(void) = audit_update_lsm_rules; static int aurule_avc_callback(u32 event) { int err = 0; if (event == AVC_CALLBACK_RESET && aurule_callback) err = aurule_callback(); return err; } static int __init aurule_init(void) { int err; err = avc_add_callback(aurule_avc_callback, AVC_CALLBACK_RESET); if (err) panic("avc_add_callback() failed, error %d\n", err); return err; } __initcall(aurule_init); #ifdef CONFIG_NETLABEL /** * security_netlbl_cache_add - Add an entry to the NetLabel cache * @secattr: the NetLabel packet security attributes * @sid: the SELinux SID * * Description: * Attempt to cache the context in @ctx, which was derived from the packet in * @skb, in the NetLabel subsystem cache. This function assumes @secattr has * already been initialized. * */ static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, u32 sid) { u32 *sid_cache; sid_cache = kmalloc(sizeof(*sid_cache), GFP_ATOMIC); if (sid_cache == NULL) return; secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); if (secattr->cache == NULL) { kfree(sid_cache); return; } *sid_cache = sid; secattr->cache->free = kfree; secattr->cache->data = sid_cache; secattr->flags |= NETLBL_SECATTR_CACHE; } /** * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID * @secattr: the NetLabel packet security attributes * @sid: the SELinux SID * * Description: * Convert the given NetLabel security attributes in @secattr into a * SELinux SID. If the @secattr field does not contain a full SELinux * SID/context then use SECINITSID_NETMSG as the foundation. If possible the * 'cache' field of @secattr is set and the CACHE flag is set; this is to * allow the @secattr to be used by NetLabel to cache the secattr to SID * conversion for future lookups. Returns zero on success, negative values on * failure. * */ int security_netlbl_secattr_to_sid(struct selinux_state *state, struct netlbl_lsm_secattr *secattr, u32 *sid) { struct policydb *policydb = &state->ss->policydb; struct sidtab *sidtab = &state->ss->sidtab; int rc; struct context *ctx; struct context ctx_new; if (!state->initialized) { *sid = SECSID_NULL; return 0; } read_lock(&state->ss->policy_rwlock); if (secattr->flags & NETLBL_SECATTR_CACHE) *sid = *(u32 *)secattr->cache->data; else if (secattr->flags & NETLBL_SECATTR_SECID) *sid = secattr->attr.secid; else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { rc = -EIDRM; ctx = sidtab_search(sidtab, SECINITSID_NETMSG); if (ctx == NULL) goto out; context_init(&ctx_new); ctx_new.user = ctx->user; ctx_new.role = ctx->role; ctx_new.type = ctx->type; mls_import_netlbl_lvl(policydb, &ctx_new, secattr); if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { rc = mls_import_netlbl_cat(policydb, &ctx_new, secattr); if (rc) goto out; } rc = -EIDRM; if (!mls_context_isvalid(policydb, &ctx_new)) goto out_free; rc = sidtab_context_to_sid(sidtab, &ctx_new, sid); if (rc) goto out_free; security_netlbl_cache_add(secattr, *sid); ebitmap_destroy(&ctx_new.range.level[0].cat); } else *sid = SECSID_NULL; read_unlock(&state->ss->policy_rwlock); return 0; out_free: ebitmap_destroy(&ctx_new.range.level[0].cat); out: read_unlock(&state->ss->policy_rwlock); return rc; } /** * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr * @sid: the SELinux SID * @secattr: the NetLabel packet security attributes * * Description: * Convert the given SELinux SID in @sid into a NetLabel security attribute. * Returns zero on success, negative values on failure. * */ int security_netlbl_sid_to_secattr(struct selinux_state *state, u32 sid, struct netlbl_lsm_secattr *secattr) { struct policydb *policydb = &state->ss->policydb; int rc; struct context *ctx; if (!state->initialized) return 0; read_lock(&state->ss->policy_rwlock); rc = -ENOENT; ctx = sidtab_search(&state->ss->sidtab, sid); if (ctx == NULL) goto out; rc = -ENOMEM; secattr->domain = kstrdup(sym_name(policydb, SYM_TYPES, ctx->type - 1), GFP_ATOMIC); if (secattr->domain == NULL) goto out; secattr->attr.secid = sid; secattr->flags |= NETLBL_SECATTR_DOMAIN_CPY | NETLBL_SECATTR_SECID; mls_export_netlbl_lvl(policydb, ctx, secattr); rc = mls_export_netlbl_cat(policydb, ctx, secattr); out: read_unlock(&state->ss->policy_rwlock); return rc; } #endif /* CONFIG_NETLABEL */ /** * security_read_policy - read the policy. * @data: binary policy data * @len: length of data in bytes * */ int security_read_policy(struct selinux_state *state, void **data, size_t *len) { struct policydb *policydb = &state->ss->policydb; int rc; struct policy_file fp; if (!state->initialized) return -EINVAL; *len = security_policydb_len(state); *data = vmalloc_user(*len); if (!*data) return -ENOMEM; fp.data = *data; fp.len = *len; read_lock(&state->ss->policy_rwlock); rc = policydb_write(policydb, &fp); read_unlock(&state->ss->policy_rwlock); if (rc) return rc; *len = (unsigned long)fp.data - (unsigned long)*data; return 0; }
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