Release 4.11 security/apparmor/policy.c
/*
* 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 <linux/cred.h>
#include <linux/rculist.h>
#include <linux/user_namespace.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"
int unprivileged_userns_apparmor_policy = 1;
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);
}
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/**
* __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);
}
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/**
* __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);
}
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/**
* __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);
}
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/**
* __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);
}
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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);
}
}
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void aa_free_proxy_kref(struct kref *kref)
{
struct aa_proxy *p = container_of(kref, struct aa_proxy, count);
free_proxy(p);
}
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/**
* aa_free_data - free a data blob
* @ptr: data to free
* @arg: unused
*/
static void aa_free_data(void *ptr, void *arg)
{
struct aa_data *data = ptr;
kzfree(data->data);
kzfree(data->key);
kzfree(data);
}
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/**
* 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)
{
struct rhashtable *rht;
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(profile->proxy);
if (profile->data) {
rht = profile->data;
profile->data = NULL;
rhashtable_free_and_destroy(rht, aa_free_data, NULL);
kzfree(rht);
}
kzfree(profile->hash);
aa_put_loaddata(profile->rawdata);
kzfree(profile);
}
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/**
* aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref)
* @head: rcu_head callback for freeing of a profile (NOT NULL)
*/
static void aa_free_profile_rcu(struct rcu_head *head)
{
struct aa_profile *p = container_of(head, struct aa_profile, rcu);
if (p->flags & PFLAG_NS_COUNT)
aa_free_ns(p->ns);
else
aa_free_profile(p);
}
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/**
* aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile)
* @kr: kref callback for freeing of a profile (NOT NULL)
*/
void aa_free_profile_kref(struct kref *kref)
{
struct aa_profile *p = container_of(kref, struct aa_profile, count);
call_rcu(&p->rcu, aa_free_profile_rcu);
}
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/**
* aa_alloc_profile - allocate, initialize and return a new profile
* @hname: name of the profile (NOT NULL)
* @gfp: allocation type
*
* Returns: refcount profile or NULL on failure
*/
struct aa_profile *aa_alloc_profile(const char *hname, gfp_t gfp)
{
struct aa_profile *profile;
/* freed by free_profile - usually through aa_put_profile */
profile = kzalloc(sizeof(*profile), gfp);
if (!profile)
return NULL;
profile->proxy = kzalloc(sizeof(struct aa_proxy), gfp);
if (!profile->proxy)
goto fail;
kref_init(&profile->proxy->count);
if (!aa_policy_init(&profile->base, NULL, hname, gfp))
goto fail;
kref_init(&profile->count);
/* refcount released by caller */
return profile;
fail:
kzfree(profile->proxy);
kzfree(profile);
return NULL;
}
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/**
* aa_new_null_profile - create or find a null-X learning profile
* @parent: profile that caused this profile to be created (NOT NULL)
* @hat: true if the null- learning profile is a hat
* @base: name to base the null profile off of
* @gfp: type of allocation
*
* Find/Create a null- complain mode profile used in learning mode. The
* name of the profile is unique and follows the format of parent//null-XXX.
* where XXX is based on the @name or if that fails or is not supplied
* a unique number
*
* null profiles are added to the profile list but the list does not
* hold a count on them so that they are automatically released when
* not in use.
*
* Returns: new refcounted profile else NULL on failure
*/
struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat,
const char *base, gfp_t gfp)
{
struct aa_profile *profile;
char *name;
AA_BUG(!parent);
if (base) {
name = kmalloc(strlen(parent->base.hname) + 8 + strlen(base),
gfp);
if (name) {
sprintf(name, "%s//null-%s", parent->base.hname, base);
goto name;
}
/* fall through to try shorter uniq */
}
name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, gfp);
if (!name)
return NULL;
sprintf(name, "%s//null-%x", parent->base.hname,
atomic_inc_return(&parent->ns->uniq_null));
name:
/* lookup to see if this is a dup creation */
profile = aa_find_child(parent, basename(name));
if (profile)
goto out;
profile = aa_alloc_profile(name, gfp);
if (!profile)
goto fail;
profile->mode = APPARMOR_COMPLAIN;
profile->flags |= PFLAG_NULL;
if (hat)
profile->flags |= PFLAG_HAT;
profile->path_flags = parent->path_flags;
/* released on free_profile */
rcu_assign_pointer(profile->parent, aa_get_profile(parent));
profile->ns = aa_get_ns(parent->ns);
profile->file.dfa = aa_get_dfa(nulldfa);
profile->policy.dfa = aa_get_dfa(nulldfa);
mutex_lock(&profile->ns->lock);
__list_add_profile(&parent->base.profiles, profile);
mutex_unlock(&profile->ns->lock);
/* refcount released by caller */
out:
kfree(name);
return profile;
fail:
kfree(name);
aa_free_profile(profile);
return NULL;
}
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/* TODO: profile accounting - setup in remove */
/**
* __find_child - find a profile on @head list with a name matching @name
* @head: list to search (NOT NULL)
* @name: name of profile (NOT NULL)
*
* Requires: rcu_read_lock be held
*
* Returns: unrefcounted profile ptr, or NULL if not found
*/
static struct aa_profile *__find_child(struct list_head *head, const char *name)
{
return (struct aa_profile *)__policy_find(head, name);
}
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/**
* __strn_find_child - find a profile on @head list using substring of @name
* @head: list to search (NOT NULL)
* @name: name of profile (NOT NULL)
* @len: length of @name substring to match
*
* Requires: rcu_read_lock be held
*
* Returns: unrefcounted profile ptr, or NULL if not found
*/
static struct aa_profile *__strn_find_child(struct list_head *head,
const char *name, int len)
{
return (struct aa_profile *)__policy_strn_find(head, name, len);
}
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/**
* aa_find_child - find a profile by @name in @parent
* @parent: profile to search (NOT NULL)
* @name: profile name to search for (NOT NULL)
*
* Returns: a refcounted profile or NULL if not found
*/
struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
{
struct aa_profile *profile;
rcu_read_lock();
do {
profile = __find_child(&parent->base.profiles, name);
} while (profile && !aa_get_profile_not0(profile));
rcu_read_unlock();
/* refcount released by caller */
return profile;
}
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/**
* __lookup_parent - lookup the parent of a profile of name @hname
* @ns: namespace to lookup profile in (NOT NULL)
* @hname: hierarchical profile name to find parent of (NOT NULL)
*
* Lookups up the parent of a fully qualified profile name, the profile
* that matches hname does not need to exist, in general this
* is used to load a new profile.
*
* Requires: rcu_read_lock be held
*
* Returns: unrefcounted policy or NULL if not found
*/
static struct aa_policy *__lookup_parent(struct aa_ns *ns,
const char *hname)
{
struct aa_policy *policy;
struct aa_profile *profile = NULL;
char *split;
policy = &ns->base;
for (split = strstr(hname, "//"); split;) {
profile = __strn_find_child(&policy->profiles, hname,
split - hname);
if (!profile)
return NULL;
policy = &profile->base;
hname = split + 2;
split = strstr(hname, "//");
}
if (!profile)
return &ns->base;
return &profile->base;
}
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/**
* __lookupn_profile - lookup the profile matching @hname
* @base: base list to start looking up profile name from (NOT NULL)
* @hname: hierarchical profile name (NOT NULL)
* @n: length of @hname
*
* Requires: rcu_read_lock be held
*
* Returns: unrefcounted profile pointer or NULL if not found
*
* Do a relative name lookup, recursing through profile tree.
*/
static struct aa_profile *__lookupn_profile(struct aa_policy *base,
const char *hname, size_t n)
{
struct aa_profile *profile = NULL;
const char *split;
for (split = strnstr(hname, "//", n); split;
split = strnstr(hname, "//", n)) {
profile = __strn_find_child(&base->profiles, hname,
split - hname);
if (!profile)
return NULL;
base = &profile->base;
n -= split + 2 - hname;
hname = split + 2;
}
if (n)
return __strn_find_child(&base->profiles, hname, n);
return NULL;
}
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static struct aa_profile *__lookup_profile(struct aa_policy *base,
const char *hname)
{
return __lookupn_profile(base, hname, strlen(hname));
}
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/**
* aa_lookup_profile - find a profile by its full or partial name
* @ns: the namespace to start from (NOT NULL)
* @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL)
* @n: size of @hname
*
* Returns: refcounted profile or NULL if not found
*/
struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname,
size_t n)
{
struct aa_profile *profile;
rcu_read_lock();
do {
profile = __lookupn_profile(&ns->base, hname, n);
} while (profile && !aa_get_profile_not0(profile));
rcu_read_unlock();
/* the unconfined profile is not in the regular profile list */
if (!profile && strncmp(hname, "unconfined", n) == 0)
profile = aa_get_newest_profile(ns->unconfined);
/* refcount released by caller */
return profile;
}
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struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname)
{
return aa_lookupn_profile(ns, hname, strlen(hname));
}
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struct aa_profile *aa_fqlookupn_profile(struct aa_profile *base,
const char *fqname, size_t n)
{
struct aa_profile *profile;
struct aa_ns *ns;
const char *name, *ns_name;
size_t ns_len;
name = aa_splitn_fqname(fqname, n, &ns_name, &ns_len);
if (ns_name) {
ns = aa_findn_ns(base->ns, ns_name, ns_len);
if (!ns)
return NULL;
} else
ns = aa_get_ns(base->ns);
if (name)
profile = aa_lookupn_profile(ns, name, n - (name - fqname));
else if (ns)
/* default profile for ns, currently unconfined */
profile = aa_get_newest_profile(ns->unconfined);
else
profile = NULL;
aa_put_ns(ns);
return profile;
}
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/**
* replacement_allowed - test to see if replacement is allowed
* @profile: profile to test if it can be replaced (MAYBE NULL)
* @noreplace: true if replacement shouldn't be allowed but addition is okay
* @info: Returns - info about why replacement failed (NOT NULL)
*
* Returns: %0 if replacement allowed else error code
*/
static int replacement_allowed(struct aa_profile *profile, int noreplace,
const char **info)
{
if (profile) {
if (profile->flags & PFLAG_IMMUTABLE) {
*info = "cannot replace immutible profile";
return -EPERM;
} else if (noreplace) {
*info = "profile already exists";
return -EEXIST;
}
}
return 0;
}
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/* audit callback for net specific fields */
static void audit_cb(struct audit_buffer *ab, void *va)
{
struct common_audit_data *sa = va;
if (aad(sa)->iface.ns) {
audit_log_format(ab, " ns=");
audit_log_untrustedstring(ab, aad(sa)->iface.ns);
}
}
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/**
* aa_audit_policy - Do auditing of policy changes
* @profile: profile to check if it can manage policy
* @op: policy operation being performed
* @gfp: memory allocation flags
* @nsname: name of the ns being manipulated (MAY BE NULL)
* @name: name of profile being manipulated (NOT NULL)
* @info: any extra information to be audited (MAYBE NULL)
* @error: error code
*
* Returns: the error to be returned after audit is done
*/
static int audit_policy(struct aa_profile *profile, const char *op,
const char *nsname, const char *name,
const char *info, int error)
{
DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, op);
aad(&sa)->iface.ns = nsname;
aad(&sa)->name = name;
aad(&sa)->info = info;
aad(&sa)->error = error;
return aa_audit(AUDIT_APPARMOR_STATUS, profile, &sa, audit_cb);
}
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/**
* policy_view_capable - check if viewing policy in at @ns is allowed
* ns: namespace being viewed by current task (may be NULL)
* Returns: true if viewing policy is allowed
*
* If @ns is NULL then the namespace being viewed is assumed to be the
* tasks current namespace.
*/
bool policy_view_capable(struct aa_ns *ns)
{
struct user_namespace *user_ns = current_user_ns();
struct aa_ns *view_ns = aa_get_current_ns();
bool root_in_user_ns = uid_eq(current_euid(), make_kuid(user_ns, 0)) ||
in_egroup_p(make_kgid(user_ns, 0));
bool response = false;
if (!ns)
ns = view_ns;
if (root_in_user_ns && aa_ns_visible(view_ns, ns, true) &&
(user_ns == &init_user_ns ||
(unprivileged_userns_apparmor_policy != 0 &&
user_ns->level == view_ns->level)))
response = true;
aa_put_ns(view_ns);
return response;
}
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bool policy_admin_capable(struct aa_ns *ns)
{
struct user_namespace *user_ns = current_user_ns();
bool capable = ns_capable(user_ns, CAP_MAC_ADMIN);
AA_DEBUG("cap_mac_admin? %d\n", capable);
AA_DEBUG("policy locked? %d\n", aa_g_lock_policy);
return policy_view_capable(ns) && capable && !aa_g_lock_policy;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 53 | 100.00% | 3 | 100.00% |
| Total | 53 | 100.00% | 3 | 100.00% |
/**
* aa_may_manage_policy - can the current task manage policy
* @profile: profile to check if it can manage policy
* @op: the policy manipulation operation being done
*
* Returns: 0 if the task is allowed to manipulate policy else error
*/
int aa_may_manage_policy(struct aa_profile *profile, struct aa_ns *ns,
const char *op)
{
/* check if loading policy is locked out */
if (aa_g_lock_policy)
return audit_policy(profile, op, NULL, NULL,
"policy_locked", -EACCES);
if (!policy_admin_capable(ns))
return audit_policy(profile, op, NULL, NULL,
"not policy admin", -EACCES);
/* TODO: add fine grained mediation of policy loads */
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 71 | 100.00% | 7 | 100.00% |
| Total | 71 | 100.00% | 7 | 100.00% |
static struct aa_profile *__list_lookup_parent(struct list_head *lh,
struct aa_profile *profile)
{
const char *base = basename(profile->base.hname);
long len = base - profile->base.hname;
struct aa_load_ent *ent;
/* parent won't have trailing // so remove from len */
if (len <= 2)
return NULL;
len -= 2;
list_for_each_entry(ent, lh, list) {
if (ent->new == profile)
continue;
if (strncmp(ent->new->base.hname, profile->base.hname, len) ==
0 && ent->new->base.hname[len] == 0)
return ent->new;
}
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 125 | 100.00% | 3 | 100.00% |
| Total | 125 | 100.00% | 3 | 100.00% |
/**
* __replace_profile - replace @old with @new on a list
* @old: profile to be replaced (NOT NULL)
* @new: profile to replace @old with (NOT NULL)
* @share_proxy: transfer @old->proxy to @new
*
* Will duplicate and refcount elements that @new inherits from @old
* and will inherit @old children.
*
* refcount @new for list, put @old list refcount
*
* Requires: namespace list lock be held, or list not be shared
*/
static void __replace_profile(struct aa_profile *old, struct aa_profile *new,
bool share_proxy)
{
struct aa_profile *child, *tmp;
if (!list_empty(&old->base.profiles)) {
LIST_HEAD(lh);
list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu);
list_for_each_entry_safe(child, tmp, &lh, base.list) {
struct aa_profile *p;
list_del_init(&child->base.list);
p = __find_child(&new->base.profiles, child->base.name);
if (p) {
/* @p replaces @child */
__replace_profile(child, p, share_proxy);
continue;
}
/* inherit @child and its children */
/* TODO: update hname of inherited children */
/* list refcount transferred to @new */
p = aa_deref_parent(child);
rcu_assign_pointer(child->parent, aa_get_profile(new));
list_add_rcu(&child->base.list, &new->base.profiles);
aa_put_profile(p);
}
}
if (!rcu_access_pointer(new->parent)) {
struct aa_profile *parent = aa_deref_parent(old);
rcu_assign_pointer(new->parent, aa_get_profile(parent));
}
__aa_update_proxy(old, new);
if (share_proxy) {
aa_put_proxy(new->proxy);
new->proxy = aa_get_proxy(old->proxy);
} else if (!rcu_access_pointer(new->proxy->profile))
/* aafs interface uses proxy */
rcu_assign_pointer(new->proxy->profile,
aa_get_profile(new));
__aa_fs_profile_migrate_dents(old, new);
if (list_empty(&new->base.list)) {
/* new is not on a list already */
list_replace_rcu(&old->base.list, &new->base.list);
aa_get_profile(new);
aa_put_profile(old);
} else
__list_remove_profile(old);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 316 | 100.00% | 5 | 100.00% |
| Total | 316 | 100.00% | 5 | 100.00% |
/**
* __lookup_replace - lookup replacement information for a profile
* @ns - namespace the lookup occurs in
* @hname - name of profile to lookup
* @noreplace - true if not replacing an existing profile
* @p - Returns: profile to be replaced
* @info - Returns: info string on why lookup failed
*
* Returns: profile to replace (no ref) on success else ptr error
*/
static int __lookup_replace(struct aa_ns *ns, const char *hname,
bool noreplace, struct aa_profile **p,
const char **info)
{
*p = aa_get_profile(__lookup_profile(&ns->base, hname));
if (*p) {
int error = replacement_allowed(*p, noreplace, info);
if (error) {
*info = "profile can not be replaced";
return error;
}
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 84 | 100.00% | 3 | 100.00% |
| Total | 84 | 100.00% | 3 | 100.00% |
/**
* aa_replace_profiles - replace profile(s) on the profile list
* @view: namespace load is viewed from
* @label: label that is attempting to load/replace policy
* @noreplace: true if only doing addition, no replacement allowed
* @udata: serialized data stream (NOT NULL)
*
* unpack and replace a profile on the profile list and uses of that profile
* by any aa_task_ctx. If the profile does not exist on the profile list
* it is added.
*
* Returns: size of data consumed else error code on failure.
*/
ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile,
bool noreplace, struct aa_loaddata *udata)
{
const char *ns_name, *info = NULL;
struct aa_ns *ns = NULL;
struct aa_load_ent *ent, *tmp;
const char *op = OP_PROF_REPL;
ssize_t count, error;
LIST_HEAD(lh);
/* released below */
error = aa_unpack(udata, &lh, &ns_name);
if (error)
goto out;
/* ensure that profiles are all for the same ns
* TODO: update locking to remove this constaint. All profiles in
* the load set must succeed as a set or the load will
* fail. Sort ent list and take ns locks in hierarchy order
*/
count = 0;
list_for_each_entry(ent, &lh, list) {
if (ns_name) {
if (ent->ns_name &&
strcmp(ent->ns_name, ns_name) != 0) {
info = "policy load has mixed namespaces";
error = -EACCES;
goto fail;
}
} else if (ent->ns_name) {
if (count) {
info = "policy load has mixed namespaces";
error = -EACCES;
goto fail;
}
ns_name = ent->ns_name;
} else
count++;
}
if (ns_name) {
ns = aa_prepare_ns(view, ns_name);
if (IS_ERR(ns)) {
info = "failed to prepare namespace";
error = PTR_ERR(ns);
ns = NULL;
goto fail;
}
} else
ns = aa_get_ns(view);
mutex_lock(&ns->lock);
/* setup parent and ns info */
list_for_each_entry(ent, &lh, list) {
struct aa_policy *policy;
ent->new->rawdata = aa_get_loaddata(udata);
error = __lookup_replace(ns, ent->new->base.hname, noreplace,
&ent->old, &info);
if (error)
goto fail_lock;
if (ent->new->rename) {
error = __lookup_replace(ns, ent->new->rename,
noreplace, &ent->rename,
&info);
if (error)
goto fail_lock;
}
/* released when @new is freed */
ent->new->ns = aa_get_ns(ns);
if (ent->old || ent->rename)
continue;
/* no ref on policy only use inside lock */
policy = __lookup_parent(ns, ent->new->base.hname);
if (!policy) {
struct aa_profile *p;
p = __list_lookup_parent(&lh, ent->new);
if (!p) {
error = -ENOENT;
info = "parent does not exist";
goto fail_lock;
}
rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
} else if (policy != &ns->base) {
/* released on profile replacement or free_profile */
struct aa_profile *p = (struct aa_profile *) policy;
rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
}
}
/* create new fs entries for introspection if needed */
list_for_each_entry(ent, &lh, list) {
if (ent->old) {
/* inherit old interface files */
/* if (ent->rename)
TODO: support rename */
/* } else if (ent->rename) {
TODO: support rename */
} else {
struct dentry *parent;
if (rcu_access_pointer(ent->new->parent)) {
struct aa_profile *p;
p = aa_deref_parent(ent->new);
parent = prof_child_dir(p);
} else
parent = ns_subprofs_dir(ent->new->ns);
error = __aa_fs_profile_mkdir(ent->new, parent);
}
if (error) {
info = "failed to create ";
goto fail_lock;
}
}
/* Done with checks that may fail - do actual replacement */
list_for_each_entry_safe(ent, tmp, &lh, list) {
list_del_init(&ent->list);
op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL;
audit_policy(profile, op, NULL, ent->new->base.hname,
NULL, error);
if (ent->old) {
__replace_profile(ent->old, ent->new, 1);
if (ent->rename) {
/* aafs interface uses proxy */
struct aa_proxy *r = ent->new->proxy;
rcu_assign_pointer(r->profile,
aa_get_profile(ent->new));
__replace_profile(ent->rename, ent->new, 0);
}
} else if (ent->rename) {
/* aafs interface uses proxy */
rcu_assign_pointer(ent->new->proxy->profile,
aa_get_profile(ent->new));
__replace_profile(ent->rename, ent->new, 0);
} else if (ent->new->parent) {
struct aa_profile *parent, *newest;
parent = aa_deref_parent(ent->new);
newest = aa_get_newest_profile(parent);
/* parent replaced in this atomic set? */
if (newest != parent) {
aa_get_profile(newest);
rcu_assign_pointer(ent->new->parent, newest);
aa_put_profile(parent);
}
/* aafs interface uses proxy */
rcu_assign_pointer(ent->new->proxy->profile,
aa_get_profile(ent->new));
__list_add_profile(&newest->base.profiles, ent->new);
aa_put_profile(newest);
} else {
/* aafs interface uses proxy */
rcu_assign_pointer(ent->new->proxy->profile,
aa_get_profile(ent->new));
__list_add_profile(&ns->base.profiles, ent->new);
}
aa_load_ent_free(ent);
}
mutex_unlock(&ns->lock);
out:
aa_put_ns(ns);
if (error)
return error;
return udata->size;
fail_lock:
mutex_unlock(&ns->lock);
/* audit cause of failure */
op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
fail:
audit_policy(profile, op, ns_name, ent->new->base.hname,
info, error);
/* audit status that rest of profiles in the atomic set failed too */
info = "valid profile in failed atomic policy load";
list_for_each_entry(tmp, &lh, list) {
if (tmp == ent) {
info = "unchecked profile in failed atomic policy load";
/* skip entry that caused failure */
continue;
}
op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
audit_policy(profile, op, ns_name,
tmp->new->base.hname, info, error);
}
list_for_each_entry_safe(ent, tmp, &lh, list) {
list_del_init(&ent->list);
aa_load_ent_free(ent);
}
goto out;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 1045 | 100.00% | 19 | 100.00% |
| Total | 1045 | 100.00% | 19 | 100.00% |
/**
* aa_remove_profiles - remove profile(s) from the system
* @view: namespace the remove is being done from
* @subj: profile attempting to remove policy
* @fqname: name of the profile or namespace to remove (NOT NULL)
* @size: size of the name
*
* Remove a profile or sub namespace from the current namespace, so that
* they can not be found anymore and mark them as replaced by unconfined
*
* NOTE: removing confinement does not restore rlimits to preconfinemnet values
*
* Returns: size of data consume else error code if fails
*/
ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_profile *subj,
char *fqname, size_t size)
{
struct aa_ns *root = NULL, *ns = NULL;
struct aa_profile *profile = NULL;
const char *name = fqname, *info = NULL;
char *ns_name = NULL;
ssize_t error = 0;
if (*fqname == 0) {
info = "no profile specified";
error = -ENOENT;
goto fail;
}
root = view;
if (fqname[0] == ':') {
name = aa_split_fqname(fqname, &ns_name);
/* released below */
ns = aa_find_ns(root, ns_name);
if (!ns) {
info = "namespace does not exist";
error = -ENOENT;
goto fail;
}
} else
/* released below */
ns = aa_get_ns(root);
if (!name) {
/* remove namespace - can only happen if fqname[0] == ':' */
mutex_lock(&ns->parent->lock);
__aa_remove_ns(ns);
mutex_unlock(&ns->parent->lock);
} else {
/* remove profile */
mutex_lock(&ns->lock);
profile = aa_get_profile(__lookup_profile(&ns->base, name));
if (!profile) {
error = -ENOENT;
info = "profile does not exist";
goto fail_ns_lock;
}
name = profile->base.hname;
__remove_profile(profile);
mutex_unlock(&ns->lock);
}
/* don't fail removal if audit fails */
(void) audit_policy(subj, OP_PROF_RM, ns_name, name, info,
error);
aa_put_ns(ns);
aa_put_profile(profile);
return size;
fail_ns_lock:
mutex_unlock(&ns->lock);
aa_put_ns(ns);
fail:
(void) audit_policy(subj, OP_PROF_RM, ns_name, name, info,
error);
return error;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 318 | 100.00% | 9 | 100.00% |
| Total | 318 | 100.00% | 9 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| John Johansen | 4024 | 97.86% | 47 | 90.38% |
| William Hua | 80 | 1.95% | 1 | 1.92% |
| Ingo Molnar | 6 | 0.15% | 2 | 3.85% |
| Jan Engelhardt | 1 | 0.02% | 1 | 1.92% |
| Eric Paris | 1 | 0.02% | 1 | 1.92% |
| Total | 4112 | 100.00% | 52 | 100.00% |
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