mirror of https://gitee.com/openkylin/linux.git
keys: Move the user and user-session keyrings to the user_namespace
Move the user and user-session keyrings to the user_namespace struct rather than pinning them from the user_struct struct. This prevents these keyrings from propagating across user-namespaces boundaries with regard to the KEY_SPEC_* flags, thereby making them more useful in a containerised environment. The issue is that a single user_struct may be represent UIDs in several different namespaces. The way the patch does this is by attaching a 'register keyring' in each user_namespace and then sticking the user and user-session keyrings into that. It can then be searched to retrieve them. Signed-off-by: David Howells <dhowells@redhat.com> cc: Jann Horn <jannh@google.com>
This commit is contained in:
parent
b206f281d0
commit
0f44e4d976
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@ -7,8 +7,6 @@
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#include <linux/refcount.h>
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#include <linux/ratelimit.h>
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struct key;
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/*
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* Some day this will be a full-fledged user tracking system..
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*/
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@ -30,18 +28,6 @@ struct user_struct {
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unsigned long unix_inflight; /* How many files in flight in unix sockets */
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atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */
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#ifdef CONFIG_KEYS
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/*
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* These pointers can only change from NULL to a non-NULL value once.
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* Writes are protected by key_user_keyring_mutex.
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* Unlocked readers should use READ_ONCE() unless they know that
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* install_user_keyrings() has been called successfully (which sets
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* these members to non-NULL values, preventing further modifications).
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*/
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struct key *uid_keyring; /* UID specific keyring */
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struct key *session_keyring; /* UID's default session keyring */
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#endif
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/* Hash table maintenance information */
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struct hlist_node uidhash_node;
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kuid_t uid;
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@ -65,14 +65,19 @@ struct user_namespace {
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unsigned long flags;
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#ifdef CONFIG_KEYS
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/* List of joinable keyrings in this namespace */
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/* List of joinable keyrings in this namespace. Modification access of
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* these pointers is controlled by keyring_sem. Once
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* user_keyring_register is set, it won't be changed, so it can be
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* accessed directly with READ_ONCE().
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*/
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struct list_head keyring_name_list;
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struct key *user_keyring_register;
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struct rw_semaphore keyring_sem;
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#endif
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/* Register of per-UID persistent keyrings for this namespace */
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#ifdef CONFIG_PERSISTENT_KEYRINGS
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struct key *persistent_keyring_register;
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struct rw_semaphore persistent_keyring_register_sem;
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#endif
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struct work_struct work;
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#ifdef CONFIG_SYSCTL
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@ -64,10 +64,7 @@ struct user_namespace init_user_ns = {
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.flags = USERNS_INIT_FLAGS,
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#ifdef CONFIG_KEYS
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.keyring_name_list = LIST_HEAD_INIT(init_user_ns.keyring_name_list),
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#endif
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#ifdef CONFIG_PERSISTENT_KEYRINGS
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.persistent_keyring_register_sem =
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__RWSEM_INITIALIZER(init_user_ns.persistent_keyring_register_sem),
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.keyring_sem = __RWSEM_INITIALIZER(init_user_ns.keyring_sem),
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#endif
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};
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EXPORT_SYMBOL_GPL(init_user_ns);
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@ -143,8 +140,6 @@ static void free_user(struct user_struct *up, unsigned long flags)
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{
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uid_hash_remove(up);
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spin_unlock_irqrestore(&uidhash_lock, flags);
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key_put(up->uid_keyring);
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key_put(up->session_keyring);
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kmem_cache_free(uid_cachep, up);
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}
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@ -135,9 +135,7 @@ int create_user_ns(struct cred *new)
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#ifdef CONFIG_KEYS
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INIT_LIST_HEAD(&ns->keyring_name_list);
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#endif
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#ifdef CONFIG_PERSISTENT_KEYRINGS
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init_rwsem(&ns->persistent_keyring_register_sem);
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init_rwsem(&ns->keyring_sem);
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#endif
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ret = -ENOMEM;
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if (!setup_userns_sysctls(ns))
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@ -148,7 +148,8 @@ extern key_ref_t search_process_keyrings_rcu(struct keyring_search_context *ctx)
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extern struct key *find_keyring_by_name(const char *name, bool uid_keyring);
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extern int install_user_keyrings(void);
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extern int look_up_user_keyrings(struct key **, struct key **);
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extern struct key *get_user_session_keyring_rcu(const struct cred *);
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extern int install_thread_keyring_to_cred(struct cred *);
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extern int install_process_keyring_to_cred(struct cred *);
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extern int install_session_keyring_to_cred(struct cred *, struct key *);
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@ -62,6 +62,7 @@ void key_free_user_ns(struct user_namespace *ns)
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list_del_init(&ns->keyring_name_list);
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write_unlock(&keyring_name_lock);
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key_put(ns->user_keyring_register);
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#ifdef CONFIG_PERSISTENT_KEYRINGS
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key_put(ns->persistent_keyring_register);
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#endif
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@ -91,9 +91,9 @@ static long key_get_persistent(struct user_namespace *ns, kuid_t uid,
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if (ns->persistent_keyring_register) {
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reg_ref = make_key_ref(ns->persistent_keyring_register, true);
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down_read(&ns->persistent_keyring_register_sem);
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down_read(&ns->keyring_sem);
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persistent_ref = find_key_to_update(reg_ref, &index_key);
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up_read(&ns->persistent_keyring_register_sem);
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up_read(&ns->keyring_sem);
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if (persistent_ref)
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goto found;
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@ -102,9 +102,9 @@ static long key_get_persistent(struct user_namespace *ns, kuid_t uid,
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/* It wasn't in the register, so we'll need to create it. We might
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* also need to create the register.
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*/
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down_write(&ns->persistent_keyring_register_sem);
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down_write(&ns->keyring_sem);
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persistent_ref = key_create_persistent(ns, uid, &index_key);
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up_write(&ns->persistent_keyring_register_sem);
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up_write(&ns->keyring_sem);
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if (!IS_ERR(persistent_ref))
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goto found;
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@ -19,15 +19,13 @@
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#include <linux/security.h>
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#include <linux/user_namespace.h>
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#include <linux/uaccess.h>
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#include <linux/init_task.h>
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#include <keys/request_key_auth-type.h>
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#include "internal.h"
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/* Session keyring create vs join semaphore */
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static DEFINE_MUTEX(key_session_mutex);
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/* User keyring creation semaphore */
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static DEFINE_MUTEX(key_user_keyring_mutex);
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/* The root user's tracking struct */
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struct key_user root_key_user = {
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.usage = REFCOUNT_INIT(3),
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@ -39,61 +37,99 @@ struct key_user root_key_user = {
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};
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/*
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* Install the user and user session keyrings for the current process's UID.
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* Get or create a user register keyring.
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*/
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int install_user_keyrings(void)
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static struct key *get_user_register(struct user_namespace *user_ns)
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{
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struct user_struct *user;
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const struct cred *cred;
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struct key *uid_keyring, *session_keyring;
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key_perm_t user_keyring_perm;
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char buf[20];
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int ret;
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uid_t uid;
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struct key *reg_keyring = READ_ONCE(user_ns->user_keyring_register);
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user_keyring_perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL;
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cred = current_cred();
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user = cred->user;
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uid = from_kuid(cred->user_ns, user->uid);
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if (reg_keyring)
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return reg_keyring;
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kenter("%p{%u}", user, uid);
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down_write(&user_ns->keyring_sem);
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if (READ_ONCE(user->uid_keyring) && READ_ONCE(user->session_keyring)) {
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kleave(" = 0 [exist]");
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return 0;
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/* Make sure there's a register keyring. It gets owned by the
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* user_namespace's owner.
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*/
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reg_keyring = user_ns->user_keyring_register;
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if (!reg_keyring) {
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reg_keyring = keyring_alloc(".user_reg",
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user_ns->owner, INVALID_GID,
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&init_cred,
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KEY_POS_WRITE | KEY_POS_SEARCH |
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KEY_USR_VIEW | KEY_USR_READ,
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0,
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NULL, NULL);
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if (!IS_ERR(reg_keyring))
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smp_store_release(&user_ns->user_keyring_register,
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reg_keyring);
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}
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mutex_lock(&key_user_keyring_mutex);
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up_write(&user_ns->keyring_sem);
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/* We don't return a ref since the keyring is pinned by the user_ns */
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return reg_keyring;
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}
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/*
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* Look up the user and user session keyrings for the current process's UID,
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* creating them if they don't exist.
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*/
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int look_up_user_keyrings(struct key **_user_keyring,
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struct key **_user_session_keyring)
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{
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const struct cred *cred = current_cred();
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struct user_namespace *user_ns = current_user_ns();
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struct key *reg_keyring, *uid_keyring, *session_keyring;
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key_perm_t user_keyring_perm;
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key_ref_t uid_keyring_r, session_keyring_r;
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uid_t uid = from_kuid(user_ns, cred->user->uid);
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char buf[20];
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int ret;
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user_keyring_perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL;
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kenter("%u", uid);
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reg_keyring = get_user_register(user_ns);
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if (IS_ERR(reg_keyring))
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return PTR_ERR(reg_keyring);
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down_write(&user_ns->keyring_sem);
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ret = 0;
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if (!user->uid_keyring) {
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/* get the UID-specific keyring
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* - there may be one in existence already as it may have been
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* pinned by a session, but the user_struct pointing to it
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* may have been destroyed by setuid */
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sprintf(buf, "_uid.%u", uid);
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uid_keyring = find_keyring_by_name(buf, true);
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if (IS_ERR(uid_keyring)) {
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uid_keyring = keyring_alloc(buf, user->uid, INVALID_GID,
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/* Get the user keyring. Note that there may be one in existence
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* already as it may have been pinned by a session, but the user_struct
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* pointing to it may have been destroyed by setuid.
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*/
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snprintf(buf, sizeof(buf), "_uid.%u", uid);
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uid_keyring_r = keyring_search(make_key_ref(reg_keyring, true),
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&key_type_keyring, buf, false);
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kdebug("_uid %p", uid_keyring_r);
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if (uid_keyring_r == ERR_PTR(-EAGAIN)) {
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uid_keyring = keyring_alloc(buf, cred->user->uid, INVALID_GID,
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cred, user_keyring_perm,
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KEY_ALLOC_UID_KEYRING |
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KEY_ALLOC_IN_QUOTA,
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NULL, NULL);
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NULL, reg_keyring);
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if (IS_ERR(uid_keyring)) {
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ret = PTR_ERR(uid_keyring);
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goto error;
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}
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} else if (IS_ERR(uid_keyring_r)) {
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ret = PTR_ERR(uid_keyring_r);
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goto error;
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} else {
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uid_keyring = key_ref_to_ptr(uid_keyring_r);
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}
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/* get a default session keyring (which might also exist
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* already) */
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sprintf(buf, "_uid_ses.%u", uid);
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session_keyring = find_keyring_by_name(buf, true);
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if (IS_ERR(session_keyring)) {
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session_keyring =
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keyring_alloc(buf, user->uid, INVALID_GID,
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/* Get a default session keyring (which might also exist already) */
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snprintf(buf, sizeof(buf), "_uid_ses.%u", uid);
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session_keyring_r = keyring_search(make_key_ref(reg_keyring, true),
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&key_type_keyring, buf, false);
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kdebug("_uid_ses %p", session_keyring_r);
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if (session_keyring_r == ERR_PTR(-EAGAIN)) {
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session_keyring = keyring_alloc(buf, cred->user->uid, INVALID_GID,
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cred, user_keyring_perm,
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KEY_ALLOC_UID_KEYRING |
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KEY_ALLOC_IN_QUOTA,
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goto error_release;
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}
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/* we install a link from the user session keyring to
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* the user keyring */
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/* We install a link from the user session keyring to
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* the user keyring.
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*/
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ret = key_link(session_keyring, uid_keyring);
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if (ret < 0)
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goto error_release_both;
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goto error_release_session;
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/* And only then link the user-session keyring to the
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* register.
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*/
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ret = key_link(reg_keyring, session_keyring);
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if (ret < 0)
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goto error_release_session;
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} else if (IS_ERR(session_keyring_r)) {
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ret = PTR_ERR(session_keyring_r);
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goto error_release;
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} else {
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session_keyring = key_ref_to_ptr(session_keyring_r);
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}
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/* install the keyrings */
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/* paired with READ_ONCE() */
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smp_store_release(&user->uid_keyring, uid_keyring);
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/* paired with READ_ONCE() */
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smp_store_release(&user->session_keyring, session_keyring);
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}
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up_write(&user_ns->keyring_sem);
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mutex_unlock(&key_user_keyring_mutex);
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if (_user_session_keyring)
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*_user_session_keyring = session_keyring;
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else
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key_put(session_keyring);
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if (_user_keyring)
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*_user_keyring = uid_keyring;
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else
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key_put(uid_keyring);
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kleave(" = 0");
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return 0;
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error_release_both:
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error_release_session:
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key_put(session_keyring);
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error_release:
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key_put(uid_keyring);
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error:
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mutex_unlock(&key_user_keyring_mutex);
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up_write(&user_ns->keyring_sem);
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kleave(" = %d", ret);
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return ret;
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}
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/*
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* Get the user session keyring if it exists, but don't create it if it
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* doesn't.
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*/
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struct key *get_user_session_keyring_rcu(const struct cred *cred)
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{
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struct key *reg_keyring = READ_ONCE(cred->user_ns->user_keyring_register);
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key_ref_t session_keyring_r;
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char buf[20];
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struct keyring_search_context ctx = {
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.index_key.type = &key_type_keyring,
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.index_key.description = buf,
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.cred = cred,
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.match_data.cmp = key_default_cmp,
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.match_data.raw_data = buf,
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.match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
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.flags = KEYRING_SEARCH_DO_STATE_CHECK,
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};
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if (!reg_keyring)
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return NULL;
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ctx.index_key.desc_len = snprintf(buf, sizeof(buf), "_uid_ses.%u",
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from_kuid(cred->user_ns,
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cred->user->uid));
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session_keyring_r = keyring_search_rcu(make_key_ref(reg_keyring, true),
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&ctx);
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if (IS_ERR(session_keyring_r))
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return NULL;
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return key_ref_to_ptr(session_keyring_r);
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}
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/*
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* Install a thread keyring to the given credentials struct if it didn't have
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* one already. This is allowed to overrun the quota.
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@ -340,6 +425,7 @@ void key_fsgid_changed(struct cred *new_cred)
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*/
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key_ref_t search_cred_keyrings_rcu(struct keyring_search_context *ctx)
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{
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struct key *user_session;
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key_ref_t key_ref, ret, err;
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const struct cred *cred = ctx->cred;
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@ -415,10 +501,11 @@ key_ref_t search_cred_keyrings_rcu(struct keyring_search_context *ctx)
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}
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}
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/* or search the user-session keyring */
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else if (READ_ONCE(cred->user->session_keyring)) {
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key_ref = keyring_search_rcu(
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make_key_ref(READ_ONCE(cred->user->session_keyring), 1),
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else if ((user_session = get_user_session_keyring_rcu(cred))) {
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key_ref = keyring_search_rcu(make_key_ref(user_session, 1),
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ctx);
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key_put(user_session);
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if (!IS_ERR(key_ref))
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goto found;
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@ -535,7 +622,7 @@ key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags,
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KEYRING_SEARCH_RECURSE),
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};
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struct request_key_auth *rka;
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struct key *key;
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struct key *key, *user_session;
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key_ref_t key_ref, skey_ref;
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int ret;
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|
@ -584,20 +671,20 @@ key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags,
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if (!ctx.cred->session_keyring) {
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/* always install a session keyring upon access if one
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* doesn't exist yet */
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ret = install_user_keyrings();
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ret = look_up_user_keyrings(NULL, &user_session);
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if (ret < 0)
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goto error;
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if (lflags & KEY_LOOKUP_CREATE)
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ret = join_session_keyring(NULL);
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else
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ret = install_session_keyring(
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ctx.cred->user->session_keyring);
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ret = install_session_keyring(user_session);
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key_put(user_session);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
goto reget_creds;
|
||||
} else if (ctx.cred->session_keyring ==
|
||||
READ_ONCE(ctx.cred->user->session_keyring) &&
|
||||
} else if (test_bit(KEY_FLAG_UID_KEYRING,
|
||||
&ctx.cred->session_keyring->flags) &&
|
||||
lflags & KEY_LOOKUP_CREATE) {
|
||||
ret = join_session_keyring(NULL);
|
||||
if (ret < 0)
|
||||
|
@ -611,26 +698,16 @@ key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags,
|
|||
break;
|
||||
|
||||
case KEY_SPEC_USER_KEYRING:
|
||||
if (!READ_ONCE(ctx.cred->user->uid_keyring)) {
|
||||
ret = install_user_keyrings();
|
||||
ret = look_up_user_keyrings(&key, NULL);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
}
|
||||
|
||||
key = ctx.cred->user->uid_keyring;
|
||||
__key_get(key);
|
||||
key_ref = make_key_ref(key, 1);
|
||||
break;
|
||||
|
||||
case KEY_SPEC_USER_SESSION_KEYRING:
|
||||
if (!READ_ONCE(ctx.cred->user->session_keyring)) {
|
||||
ret = install_user_keyrings();
|
||||
ret = look_up_user_keyrings(NULL, &key);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
}
|
||||
|
||||
key = ctx.cred->user->session_keyring;
|
||||
__key_get(key);
|
||||
key_ref = make_key_ref(key, 1);
|
||||
break;
|
||||
|
||||
|
@ -879,7 +956,7 @@ void key_change_session_keyring(struct callback_head *twork)
|
|||
*/
|
||||
static int __init init_root_keyring(void)
|
||||
{
|
||||
return install_user_keyrings();
|
||||
return look_up_user_keyrings(NULL, NULL);
|
||||
}
|
||||
|
||||
late_initcall(init_root_keyring);
|
||||
|
|
|
@ -121,7 +121,7 @@ static int call_sbin_request_key(struct key *authkey, void *aux)
|
|||
struct request_key_auth *rka = get_request_key_auth(authkey);
|
||||
const struct cred *cred = current_cred();
|
||||
key_serial_t prkey, sskey;
|
||||
struct key *key = rka->target_key, *keyring, *session;
|
||||
struct key *key = rka->target_key, *keyring, *session, *user_session;
|
||||
char *argv[9], *envp[3], uid_str[12], gid_str[12];
|
||||
char key_str[12], keyring_str[3][12];
|
||||
char desc[20];
|
||||
|
@ -129,9 +129,9 @@ static int call_sbin_request_key(struct key *authkey, void *aux)
|
|||
|
||||
kenter("{%d},{%d},%s", key->serial, authkey->serial, rka->op);
|
||||
|
||||
ret = install_user_keyrings();
|
||||
ret = look_up_user_keyrings(NULL, &user_session);
|
||||
if (ret < 0)
|
||||
goto error_alloc;
|
||||
goto error_us;
|
||||
|
||||
/* allocate a new session keyring */
|
||||
sprintf(desc, "_req.%u", key->serial);
|
||||
|
@ -169,7 +169,7 @@ static int call_sbin_request_key(struct key *authkey, void *aux)
|
|||
|
||||
session = cred->session_keyring;
|
||||
if (!session)
|
||||
session = cred->user->session_keyring;
|
||||
session = user_session;
|
||||
sskey = session->serial;
|
||||
|
||||
sprintf(keyring_str[2], "%d", sskey);
|
||||
|
@ -211,6 +211,8 @@ static int call_sbin_request_key(struct key *authkey, void *aux)
|
|||
key_put(keyring);
|
||||
|
||||
error_alloc:
|
||||
key_put(user_session);
|
||||
error_us:
|
||||
complete_request_key(authkey, ret);
|
||||
kleave(" = %d", ret);
|
||||
return ret;
|
||||
|
@ -317,13 +319,15 @@ static int construct_get_dest_keyring(struct key **_dest_keyring)
|
|||
|
||||
/* fall through */
|
||||
case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
|
||||
dest_keyring =
|
||||
key_get(READ_ONCE(cred->user->session_keyring));
|
||||
ret = look_up_user_keyrings(NULL, &dest_keyring);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
break;
|
||||
|
||||
case KEY_REQKEY_DEFL_USER_KEYRING:
|
||||
dest_keyring =
|
||||
key_get(READ_ONCE(cred->user->uid_keyring));
|
||||
ret = look_up_user_keyrings(&dest_keyring, NULL);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
break;
|
||||
|
||||
case KEY_REQKEY_DEFL_GROUP_KEYRING:
|
||||
|
|
Loading…
Reference in New Issue