mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 03:59:55 +07:00
24ed7fdae6
This moves handling of initial SIDs into a separate table. Note that the SIDs stored in the main table are now shifted by SECINITSID_NUM and converted to/from the actual SIDs transparently by helper functions. This change doesn't make much sense on its own, but it simplifies further sidtab overhaul in a succeeding patch. Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com> Reviewed-by: Stephen Smalley <sds@tycho.nsa.gov> [PM: fixed some checkpatch warnings on line length, whitespace] Signed-off-by: Paul Moore <paul@paul-moore.com>
3717 lines
88 KiB
C
3717 lines
88 KiB
C
/*
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* Implementation of the security services.
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*
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* Authors : Stephen Smalley, <sds@tycho.nsa.gov>
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* James Morris <jmorris@redhat.com>
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*
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* Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
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*
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* Support for enhanced MLS infrastructure.
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* Support for context based audit filters.
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*
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* Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
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*
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* Added conditional policy language extensions
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*
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* Updated: Hewlett-Packard <paul@paul-moore.com>
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*
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* Added support for NetLabel
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* Added support for the policy capability bitmap
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*
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* Updated: Chad Sellers <csellers@tresys.com>
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*
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* Added validation of kernel classes and permissions
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*
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* Updated: KaiGai Kohei <kaigai@ak.jp.nec.com>
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*
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* Added support for bounds domain and audit messaged on masked permissions
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*
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* Updated: Guido Trentalancia <guido@trentalancia.com>
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*
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* Added support for runtime switching of the policy type
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*
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* Copyright (C) 2008, 2009 NEC Corporation
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* Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
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* Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
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* Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC
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* Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/spinlock.h>
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#include <linux/rcupdate.h>
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#include <linux/errno.h>
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#include <linux/in.h>
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#include <linux/sched.h>
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#include <linux/audit.h>
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#include <linux/mutex.h>
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#include <linux/selinux.h>
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#include <linux/flex_array.h>
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#include <linux/vmalloc.h>
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#include <net/netlabel.h>
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#include "flask.h"
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#include "avc.h"
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#include "avc_ss.h"
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#include "security.h"
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#include "context.h"
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#include "policydb.h"
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#include "sidtab.h"
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#include "services.h"
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#include "conditional.h"
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#include "mls.h"
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#include "objsec.h"
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#include "netlabel.h"
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#include "xfrm.h"
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#include "ebitmap.h"
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#include "audit.h"
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/* Policy capability names */
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const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX] = {
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"network_peer_controls",
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"open_perms",
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"extended_socket_class",
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"always_check_network",
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"cgroup_seclabel",
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"nnp_nosuid_transition"
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};
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static struct selinux_ss selinux_ss;
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void selinux_ss_init(struct selinux_ss **ss)
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{
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rwlock_init(&selinux_ss.policy_rwlock);
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mutex_init(&selinux_ss.status_lock);
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*ss = &selinux_ss;
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}
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/* Forward declaration. */
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static int context_struct_to_string(struct policydb *policydb,
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struct context *context,
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char **scontext,
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u32 *scontext_len);
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static void context_struct_compute_av(struct policydb *policydb,
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struct context *scontext,
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struct context *tcontext,
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u16 tclass,
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struct av_decision *avd,
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struct extended_perms *xperms);
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static int selinux_set_mapping(struct policydb *pol,
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struct security_class_mapping *map,
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struct selinux_map *out_map)
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{
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u16 i, j;
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unsigned k;
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bool print_unknown_handle = false;
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/* Find number of classes in the input mapping */
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if (!map)
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return -EINVAL;
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i = 0;
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while (map[i].name)
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i++;
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/* Allocate space for the class records, plus one for class zero */
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out_map->mapping = kcalloc(++i, sizeof(*out_map->mapping), GFP_ATOMIC);
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if (!out_map->mapping)
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return -ENOMEM;
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/* Store the raw class and permission values */
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j = 0;
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while (map[j].name) {
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struct security_class_mapping *p_in = map + (j++);
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struct selinux_mapping *p_out = out_map->mapping + j;
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/* An empty class string skips ahead */
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if (!strcmp(p_in->name, "")) {
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p_out->num_perms = 0;
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continue;
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}
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p_out->value = string_to_security_class(pol, p_in->name);
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if (!p_out->value) {
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pr_info("SELinux: Class %s not defined in policy.\n",
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p_in->name);
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if (pol->reject_unknown)
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goto err;
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p_out->num_perms = 0;
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print_unknown_handle = true;
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continue;
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}
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k = 0;
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while (p_in->perms[k]) {
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/* An empty permission string skips ahead */
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if (!*p_in->perms[k]) {
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k++;
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continue;
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}
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p_out->perms[k] = string_to_av_perm(pol, p_out->value,
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p_in->perms[k]);
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if (!p_out->perms[k]) {
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pr_info("SELinux: Permission %s in class %s not defined in policy.\n",
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p_in->perms[k], p_in->name);
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if (pol->reject_unknown)
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goto err;
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print_unknown_handle = true;
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}
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k++;
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}
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p_out->num_perms = k;
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}
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if (print_unknown_handle)
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pr_info("SELinux: the above unknown classes and permissions will be %s\n",
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pol->allow_unknown ? "allowed" : "denied");
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out_map->size = i;
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return 0;
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err:
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kfree(out_map->mapping);
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out_map->mapping = NULL;
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return -EINVAL;
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}
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/*
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* Get real, policy values from mapped values
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*/
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static u16 unmap_class(struct selinux_map *map, u16 tclass)
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{
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if (tclass < map->size)
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return map->mapping[tclass].value;
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return tclass;
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}
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/*
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* Get kernel value for class from its policy value
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*/
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static u16 map_class(struct selinux_map *map, u16 pol_value)
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{
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u16 i;
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for (i = 1; i < map->size; i++) {
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if (map->mapping[i].value == pol_value)
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return i;
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}
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return SECCLASS_NULL;
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}
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static void map_decision(struct selinux_map *map,
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u16 tclass, struct av_decision *avd,
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int allow_unknown)
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{
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if (tclass < map->size) {
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struct selinux_mapping *mapping = &map->mapping[tclass];
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unsigned int i, n = mapping->num_perms;
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u32 result;
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for (i = 0, result = 0; i < n; i++) {
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if (avd->allowed & mapping->perms[i])
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result |= 1<<i;
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if (allow_unknown && !mapping->perms[i])
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result |= 1<<i;
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}
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avd->allowed = result;
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for (i = 0, result = 0; i < n; i++)
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if (avd->auditallow & mapping->perms[i])
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result |= 1<<i;
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avd->auditallow = result;
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for (i = 0, result = 0; i < n; i++) {
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if (avd->auditdeny & mapping->perms[i])
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result |= 1<<i;
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if (!allow_unknown && !mapping->perms[i])
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result |= 1<<i;
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}
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/*
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* In case the kernel has a bug and requests a permission
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* between num_perms and the maximum permission number, we
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* should audit that denial
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*/
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for (; i < (sizeof(u32)*8); i++)
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result |= 1<<i;
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avd->auditdeny = result;
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}
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}
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int security_mls_enabled(struct selinux_state *state)
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{
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struct policydb *p = &state->ss->policydb;
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return p->mls_enabled;
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}
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/*
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* Return the boolean value of a constraint expression
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* when it is applied to the specified source and target
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* security contexts.
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*
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* xcontext is a special beast... It is used by the validatetrans rules
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* only. For these rules, scontext is the context before the transition,
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* tcontext is the context after the transition, and xcontext is the context
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* of the process performing the transition. All other callers of
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* constraint_expr_eval should pass in NULL for xcontext.
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*/
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static int constraint_expr_eval(struct policydb *policydb,
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struct context *scontext,
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struct context *tcontext,
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struct context *xcontext,
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struct constraint_expr *cexpr)
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{
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u32 val1, val2;
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struct context *c;
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struct role_datum *r1, *r2;
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struct mls_level *l1, *l2;
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struct constraint_expr *e;
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int s[CEXPR_MAXDEPTH];
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int sp = -1;
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for (e = cexpr; e; e = e->next) {
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switch (e->expr_type) {
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case CEXPR_NOT:
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BUG_ON(sp < 0);
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s[sp] = !s[sp];
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break;
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case CEXPR_AND:
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BUG_ON(sp < 1);
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sp--;
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s[sp] &= s[sp + 1];
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break;
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case CEXPR_OR:
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BUG_ON(sp < 1);
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sp--;
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s[sp] |= s[sp + 1];
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break;
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case CEXPR_ATTR:
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if (sp == (CEXPR_MAXDEPTH - 1))
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return 0;
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switch (e->attr) {
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case CEXPR_USER:
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val1 = scontext->user;
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val2 = tcontext->user;
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break;
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case CEXPR_TYPE:
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val1 = scontext->type;
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val2 = tcontext->type;
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break;
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case CEXPR_ROLE:
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val1 = scontext->role;
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val2 = tcontext->role;
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r1 = policydb->role_val_to_struct[val1 - 1];
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r2 = policydb->role_val_to_struct[val2 - 1];
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switch (e->op) {
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case CEXPR_DOM:
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s[++sp] = ebitmap_get_bit(&r1->dominates,
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val2 - 1);
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continue;
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case CEXPR_DOMBY:
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s[++sp] = ebitmap_get_bit(&r2->dominates,
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val1 - 1);
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continue;
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case CEXPR_INCOMP:
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s[++sp] = (!ebitmap_get_bit(&r1->dominates,
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val2 - 1) &&
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!ebitmap_get_bit(&r2->dominates,
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val1 - 1));
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continue;
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default:
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break;
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}
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break;
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case CEXPR_L1L2:
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l1 = &(scontext->range.level[0]);
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l2 = &(tcontext->range.level[0]);
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goto mls_ops;
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case CEXPR_L1H2:
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l1 = &(scontext->range.level[0]);
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l2 = &(tcontext->range.level[1]);
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goto mls_ops;
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case CEXPR_H1L2:
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l1 = &(scontext->range.level[1]);
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l2 = &(tcontext->range.level[0]);
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goto mls_ops;
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case CEXPR_H1H2:
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l1 = &(scontext->range.level[1]);
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l2 = &(tcontext->range.level[1]);
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goto mls_ops;
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case CEXPR_L1H1:
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l1 = &(scontext->range.level[0]);
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l2 = &(scontext->range.level[1]);
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goto mls_ops;
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case CEXPR_L2H2:
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l1 = &(tcontext->range.level[0]);
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l2 = &(tcontext->range.level[1]);
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goto mls_ops;
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mls_ops:
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switch (e->op) {
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case CEXPR_EQ:
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s[++sp] = mls_level_eq(l1, l2);
|
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continue;
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case CEXPR_NEQ:
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s[++sp] = !mls_level_eq(l1, l2);
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continue;
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case CEXPR_DOM:
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s[++sp] = mls_level_dom(l1, l2);
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continue;
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case CEXPR_DOMBY:
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s[++sp] = mls_level_dom(l2, l1);
|
|
continue;
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case CEXPR_INCOMP:
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s[++sp] = mls_level_incomp(l2, l1);
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continue;
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|
default:
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BUG();
|
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return 0;
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}
|
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break;
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|
default:
|
|
BUG();
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return 0;
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}
|
|
|
|
switch (e->op) {
|
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case CEXPR_EQ:
|
|
s[++sp] = (val1 == val2);
|
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break;
|
|
case CEXPR_NEQ:
|
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s[++sp] = (val1 != val2);
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break;
|
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default:
|
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BUG();
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return 0;
|
|
}
|
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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();
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|
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);
|
|
}
|
|
|
|
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;
|
|
|
|
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 *oldsidtab, *newsidtab;
|
|
struct policydb *oldpolicydb, *newpolicydb;
|
|
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;
|
|
|
|
newsidtab = kmalloc(sizeof(*newsidtab), GFP_KERNEL);
|
|
if (!newsidtab) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (!state->initialized) {
|
|
rc = policydb_read(policydb, fp);
|
|
if (rc) {
|
|
kfree(newsidtab);
|
|
goto out;
|
|
}
|
|
|
|
policydb->len = len;
|
|
rc = selinux_set_mapping(policydb, secclass_map,
|
|
&state->ss->map);
|
|
if (rc) {
|
|
kfree(newsidtab);
|
|
policydb_destroy(policydb);
|
|
goto out;
|
|
}
|
|
|
|
rc = policydb_load_isids(policydb, newsidtab);
|
|
if (rc) {
|
|
kfree(newsidtab);
|
|
policydb_destroy(policydb);
|
|
goto out;
|
|
}
|
|
|
|
state->ss->sidtab = newsidtab;
|
|
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;
|
|
}
|
|
|
|
oldsidtab = state->ss->sidtab;
|
|
|
|
#if 0
|
|
sidtab_hash_eval(oldsidtab, "sids");
|
|
#endif
|
|
|
|
rc = policydb_read(newpolicydb, fp);
|
|
if (rc) {
|
|
kfree(newsidtab);
|
|
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);
|
|
kfree(newsidtab);
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Convert the internal representations of contexts
|
|
* in the new SID table.
|
|
*/
|
|
args.state = state;
|
|
args.oldp = policydb;
|
|
args.newp = newpolicydb;
|
|
rc = sidtab_convert(oldsidtab, 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));
|
|
|
|
/* Install the new policydb and SID table. */
|
|
write_lock_irq(&state->ss->policy_rwlock);
|
|
memcpy(policydb, newpolicydb, sizeof(*policydb));
|
|
state->ss->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(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);
|
|
kfree(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;
|
|
|
|
}
|