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|
/*
* AppArmor security module
*
* This file contains AppArmor policy manipulation functions
*
* Copyright (C) 1998-2008 Novell/SUSE
* Copyright 2009-2010 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*
*
* AppArmor policy is based around profiles, which contain the rules a
* task is confined by. Every task in the system has a profile attached
* to it determined either by matching "unconfined" tasks against the
* visible set of profiles or by following a profiles attachment rules.
*
* Each profile exists in a profile namespace which is a container of
* visible profiles. Each namespace contains a special "unconfined" profile,
* which doesn't enforce any confinement on a task beyond DAC.
*
* Namespace and profile names can be written together in either
* of two syntaxes.
* :namespace:profile - used by kernel interfaces for easy detection
* namespace://profile - used by policy
*
* Profile names can not start with : or @ or ^ and may not contain \0
*
* Reserved profile names
* unconfined - special automatically generated unconfined profile
* inherit - special name to indicate profile inheritance
* null-XXXX-YYYY - special automatically generated learning profiles
*
* Namespace names may not start with / or @ and may not contain \0 or :
* Reserved namespace names
* user-XXXX - user defined profiles
*
* a // in a profile or namespace name indicates a hierarchical name with the
* name before the // being the parent and the name after the child.
*
* Profile and namespace hierarchies serve two different but similar purposes.
* The namespace contains the set of visible profiles that are considered
* for attachment. The hierarchy of namespaces allows for virtualizing
* the namespace so that for example a chroot can have its own set of profiles
* which may define some local user namespaces.
* The profile hierarchy severs two distinct purposes,
* - it allows for sub profiles or hats, which allows an application to run
* subprograms under its own profile with different restriction than it
* self, and not have it use the system profile.
* eg. if a mail program starts an editor, the policy might make the
* restrictions tighter on the editor tighter than the mail program,
* and definitely different than general editor restrictions
* - it allows for binary hierarchy of profiles, so that execution history
* is preserved. This feature isn't exploited by AppArmor reference policy
* but is allowed. NOTE: this is currently suboptimal because profile
* aliasing is not currently implemented so that a profile for each
* level must be defined.
* eg. /bin/bash///bin/ls as a name would indicate /bin/ls was started
* from /bin/bash
*
* A profile or namespace name that can contain one or more // separators
* is referred to as an hname (hierarchical).
* eg. /bin/bash//bin/ls
*
* An fqname is a name that may contain both namespace and profile hnames.
* eg. :ns:/bin/bash//bin/ls
*
* NOTES:
* - locking of profile lists is currently fairly coarse. All profile
* lists within a namespace use the namespace lock.
* FIXME: move profile lists to using rcu_lists
*/
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include "include/apparmor.h"
#include "include/capability.h"
#include "include/context.h"
#include "include/file.h"
#include "include/ipc.h"
#include "include/match.h"
#include "include/path.h"
#include "include/policy.h"
#include "include/policy_ns.h"
#include "include/policy_unpack.h"
#include "include/resource.h"
const char *const aa_profile_mode_names[] = {
"enforce",
"complain",
"kill",
"unconfined",
};
/* requires profile list write lock held */
void __aa_update_proxy(struct aa_profile *orig, struct aa_profile *new)
{
struct aa_profile *tmp;
tmp = rcu_dereference_protected(orig->proxy->profile,
mutex_is_locked(&orig->ns->lock));
rcu_assign_pointer(orig->proxy->profile, aa_get_profile(new));
orig->flags |= PFLAG_STALE;
aa_put_profile(tmp);
}
/**
* __list_add_profile - add a profile to a list
* @list: list to add it to (NOT NULL)
* @profile: the profile to add (NOT NULL)
*
* refcount @profile, should be put by __list_remove_profile
*
* Requires: namespace lock be held, or list not be shared
*/
static void __list_add_profile(struct list_head *list,
struct aa_profile *profile)
{
list_add_rcu(&profile->base.list, list);
/* get list reference */
aa_get_profile(profile);
}
/**
* __list_remove_profile - remove a profile from the list it is on
* @profile: the profile to remove (NOT NULL)
*
* remove a profile from the list, warning generally removal should
* be done with __replace_profile as most profile removals are
* replacements to the unconfined profile.
*
* put @profile list refcount
*
* Requires: namespace lock be held, or list not have been live
*/
static void __list_remove_profile(struct aa_profile *profile)
{
list_del_rcu(&profile->base.list);
aa_put_profile(profile);
}
/**
* __remove_profile - remove old profile, and children
* @profile: profile to be replaced (NOT NULL)
*
* Requires: namespace list lock be held, or list not be shared
*/
static void __remove_profile(struct aa_profile *profile)
{
/* release any children lists first */
__aa_profile_list_release(&profile->base.profiles);
/* released by free_profile */
__aa_update_proxy(profile, profile->ns->unconfined);
__aa_fs_profile_rmdir(profile);
__list_remove_profile(profile);
}
/**
* __aa_profile_list_release - remove all profiles on the list and put refs
* @head: list of profiles (NOT NULL)
*
* Requires: namespace lock be held
*/
void __aa_profile_list_release(struct list_head *head)
{
struct aa_profile *profile, *tmp;
list_for_each_entry_safe(profile, tmp, head, base.list)
__remove_profile(profile);
}
static void free_proxy(struct aa_proxy *p)
{
if (p) {
/* r->profile will not be updated any more as r is dead */
aa_put_profile(rcu_dereference_protected(p->profile, true));
kzfree(p);
}
}
void aa_free_proxy_kref(struct kref *kref)
{
struct aa_proxy *p = container_of(kref, struct aa_proxy, count);
free_proxy(p);
}
/**
* aa_free_profile - free a profile
* @profile: the profile to free (MAYBE NULL)
*
* Free a profile, its hats and null_profile. All references to the profile,
* its hats and null_profile must have been put.
*
* If the profile was referenced from a task context, free_profile() will
* be called from an rcu callback routine, so we must not sleep here.
*/
void aa_free_profile(struct aa_profile *profile)
{
AA_DEBUG("%s(%p)\n", __func__, profile);
if (!profile)
return;
/* free children profiles */
aa_policy_destroy(&profile->base);
aa_put_profile(rcu_access_pointer(profile->parent));
aa_put_ns(profile->ns);
kzfree(profile->rename);
aa_free_file_rules(&profile->file);
aa_free_cap_rules(&profile->caps);
aa_free_rlimit_rules(&profile->rlimits);
kzfree(profile->dirname);
aa_put_dfa(profile->xmatch);
aa_put_dfa(profile->policy.dfa);
aa_put_proxy
|