From d4f65b5d2497b2fd9c45f06b71deb4ab084a5b66 Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 13 Sep 2012 13:06:29 +0100 Subject: KEYS: Add payload preparsing opportunity prior to key instantiate or update Give the key type the opportunity to preparse the payload prior to the instantiation and update routines being called. This is done with the provision of two new key type operations: int (*preparse)(struct key_preparsed_payload *prep); void (*free_preparse)(struct key_preparsed_payload *prep); If the first operation is present, then it is called before key creation (in the add/update case) or before the key semaphore is taken (in the update and instantiate cases). The second operation is called to clean up if the first was called. preparse() is given the opportunity to fill in the following structure: struct key_preparsed_payload { char *description; void *type_data[2]; void *payload; const void *data; size_t datalen; size_t quotalen; }; Before the preparser is called, the first three fields will have been cleared, the payload pointer and size will be stored in data and datalen and the default quota size from the key_type struct will be stored into quotalen. The preparser may parse the payload in any way it likes and may store data in the type_data[] and payload fields for use by the instantiate() and update() ops. The preparser may also propose a description for the key by attaching it as a string to the description field. This can be used by passing a NULL or "" description to the add_key() system call or the key_create_or_update() function. This cannot work with request_key() as that required the description to tell the upcall about the key to be created. This, for example permits keys that store PGP public keys to generate their own name from the user ID and public key fingerprint in the key. The instantiate() and update() operations are then modified to look like this: int (*instantiate)(struct key *key, struct key_preparsed_payload *prep); int (*update)(struct key *key, struct key_preparsed_payload *prep); and the new payload data is passed in *prep, whether or not it was preparsed. Signed-off-by: David Howells --- include/keys/user-type.h | 6 ++++-- include/linux/key-type.h | 35 +++++++++++++++++++++++++++++++++-- 2 files changed, 37 insertions(+), 4 deletions(-) (limited to 'include') diff --git a/include/keys/user-type.h b/include/keys/user-type.h index bc9ec1d7698c..5e452c84f1e6 100644 --- a/include/keys/user-type.h +++ b/include/keys/user-type.h @@ -35,8 +35,10 @@ struct user_key_payload { extern struct key_type key_type_user; extern struct key_type key_type_logon; -extern int user_instantiate(struct key *key, const void *data, size_t datalen); -extern int user_update(struct key *key, const void *data, size_t datalen); +struct key_preparsed_payload; + +extern int user_instantiate(struct key *key, struct key_preparsed_payload *prep); +extern int user_update(struct key *key, struct key_preparsed_payload *prep); extern int user_match(const struct key *key, const void *criterion); extern void user_revoke(struct key *key); extern void user_destroy(struct key *key); diff --git a/include/linux/key-type.h b/include/linux/key-type.h index f0c651cda7b0..518a53afb9ea 100644 --- a/include/linux/key-type.h +++ b/include/linux/key-type.h @@ -26,6 +26,27 @@ struct key_construction { struct key *authkey;/* authorisation for key being constructed */ }; +/* + * Pre-parsed payload, used by key add, update and instantiate. + * + * This struct will be cleared and data and datalen will be set with the data + * and length parameters from the caller and quotalen will be set from + * def_datalen from the key type. Then if the preparse() op is provided by the + * key type, that will be called. Then the struct will be passed to the + * instantiate() or the update() op. + * + * If the preparse() op is given, the free_preparse() op will be called to + * clear the contents. + */ +struct key_preparsed_payload { + char *description; /* Proposed key description (or NULL) */ + void *type_data[2]; /* Private key-type data */ + void *payload; /* Proposed payload */ + const void *data; /* Raw data */ + size_t datalen; /* Raw datalen */ + size_t quotalen; /* Quota length for proposed payload */ +}; + typedef int (*request_key_actor_t)(struct key_construction *key, const char *op, void *aux); @@ -45,18 +66,28 @@ struct key_type { /* vet a description */ int (*vet_description)(const char *description); + /* Preparse the data blob from userspace that is to be the payload, + * generating a proposed description and payload that will be handed to + * the instantiate() and update() ops. + */ + int (*preparse)(struct key_preparsed_payload *prep); + + /* Free a preparse data structure. + */ + void (*free_preparse)(struct key_preparsed_payload *prep); + /* instantiate a key of this type * - this method should call key_payload_reserve() to determine if the * user's quota will hold the payload */ - int (*instantiate)(struct key *key, const void *data, size_t datalen); + int (*instantiate)(struct key *key, struct key_preparsed_payload *prep); /* update a key of this type (optional) * - this method should call key_payload_reserve() to recalculate the * quota consumption * - the key must be locked against read when modifying */ - int (*update)(struct key *key, const void *data, size_t datalen); + int (*update)(struct key *key, struct key_preparsed_payload *prep); /* match a key against a description */ int (*match)(const struct key *key, const void *desc); -- cgit v1.2.3 From 3a50597de8635cd05133bd12c95681c82fe7b878 Mon Sep 17 00:00:00 2001 From: David Howells Date: Tue, 2 Oct 2012 19:24:29 +0100 Subject: KEYS: Make the session and process keyrings per-thread Make the session keyring per-thread rather than per-process, but still inherited from the parent thread to solve a problem with PAM and gdm. The problem is that join_session_keyring() will reject attempts to change the session keyring of a multithreaded program but gdm is now multithreaded before it gets to the point of starting PAM and running pam_keyinit to create the session keyring. See: https://bugs.freedesktop.org/show_bug.cgi?id=49211 The reason that join_session_keyring() will only change the session keyring under a single-threaded environment is that it's hard to alter the other thread's credentials to effect the change in a multi-threaded program. The problems are such as: (1) How to prevent two threads both running join_session_keyring() from racing. (2) Another thread's credentials may not be modified directly by this process. (3) The number of threads is uncertain whilst we're not holding the appropriate spinlock, making preallocation slightly tricky. (4) We could use TIF_NOTIFY_RESUME and key_replace_session_keyring() to get another thread to replace its keyring, but that means preallocating for each thread. A reasonable way around this is to make the session keyring per-thread rather than per-process and just document that if you want a common session keyring, you must get it before you spawn any threads - which is the current situation anyway. Whilst we're at it, we can the process keyring behave in the same way. This means we can clean up some of the ickyness in the creds code. Basically, after this patch, the session, process and thread keyrings are about inheritance rules only and not about sharing changes of keyring. Reported-by: Mantas M. Signed-off-by: David Howells Tested-by: Ray Strode --- include/linux/cred.h | 17 +----- kernel/cred.c | 127 +++++-------------------------------------- security/keys/keyctl.c | 11 ++-- security/keys/process_keys.c | 66 ++++++++-------------- security/keys/request_key.c | 10 ++-- 5 files changed, 50 insertions(+), 181 deletions(-) (limited to 'include') diff --git a/include/linux/cred.h b/include/linux/cred.h index ebbed2ce6637..0142aacb70b7 100644 --- a/include/linux/cred.h +++ b/include/linux/cred.h @@ -76,21 +76,6 @@ extern int groups_search(const struct group_info *, kgid_t); extern int in_group_p(kgid_t); extern int in_egroup_p(kgid_t); -/* - * The common credentials for a thread group - * - shared by CLONE_THREAD - */ -#ifdef CONFIG_KEYS -struct thread_group_cred { - atomic_t usage; - pid_t tgid; /* thread group process ID */ - spinlock_t lock; - struct key __rcu *session_keyring; /* keyring inherited over fork */ - struct key *process_keyring; /* keyring private to this process */ - struct rcu_head rcu; /* RCU deletion hook */ -}; -#endif - /* * The security context of a task * @@ -139,6 +124,8 @@ struct cred { #ifdef CONFIG_KEYS unsigned char jit_keyring; /* default keyring to attach requested * keys to */ + struct key __rcu *session_keyring; /* keyring inherited over fork */ + struct key *process_keyring; /* keyring private to this process */ struct key *thread_keyring; /* keyring private to this thread */ struct key *request_key_auth; /* assumed request_key authority */ struct thread_group_cred *tgcred; /* thread-group shared credentials */ diff --git a/kernel/cred.c b/kernel/cred.c index de728ac50d82..3f7ad1ec2ae4 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -29,17 +29,6 @@ static struct kmem_cache *cred_jar; -/* - * The common credentials for the initial task's thread group - */ -#ifdef CONFIG_KEYS -static struct thread_group_cred init_tgcred = { - .usage = ATOMIC_INIT(2), - .tgid = 0, - .lock = __SPIN_LOCK_UNLOCKED(init_cred.tgcred.lock), -}; -#endif - /* * The initial credentials for the initial task */ @@ -65,9 +54,6 @@ struct cred init_cred = { .user = INIT_USER, .user_ns = &init_user_ns, .group_info = &init_groups, -#ifdef CONFIG_KEYS - .tgcred = &init_tgcred, -#endif }; static inline void set_cred_subscribers(struct cred *cred, int n) @@ -95,36 +81,6 @@ static inline void alter_cred_subscribers(const struct cred *_cred, int n) #endif } -/* - * Dispose of the shared task group credentials - */ -#ifdef CONFIG_KEYS -static void release_tgcred_rcu(struct rcu_head *rcu) -{ - struct thread_group_cred *tgcred = - container_of(rcu, struct thread_group_cred, rcu); - - BUG_ON(atomic_read(&tgcred->usage) != 0); - - key_put(tgcred->session_keyring); - key_put(tgcred->process_keyring); - kfree(tgcred); -} -#endif - -/* - * Release a set of thread group credentials. - */ -static void release_tgcred(struct cred *cred) -{ -#ifdef CONFIG_KEYS - struct thread_group_cred *tgcred = cred->tgcred; - - if (atomic_dec_and_test(&tgcred->usage)) - call_rcu(&tgcred->rcu, release_tgcred_rcu); -#endif -} - /* * The RCU callback to actually dispose of a set of credentials */ @@ -150,9 +106,10 @@ static void put_cred_rcu(struct rcu_head *rcu) #endif security_cred_free(cred); + key_put(cred->session_keyring); + key_put(cred->process_keyring); key_put(cred->thread_keyring); key_put(cred->request_key_auth); - release_tgcred(cred); if (cred->group_info) put_group_info(cred->group_info); free_uid(cred->user); @@ -246,15 +203,6 @@ struct cred *cred_alloc_blank(void) if (!new) return NULL; -#ifdef CONFIG_KEYS - new->tgcred = kzalloc(sizeof(*new->tgcred), GFP_KERNEL); - if (!new->tgcred) { - kmem_cache_free(cred_jar, new); - return NULL; - } - atomic_set(&new->tgcred->usage, 1); -#endif - atomic_set(&new->usage, 1); #ifdef CONFIG_DEBUG_CREDENTIALS new->magic = CRED_MAGIC; @@ -308,9 +256,10 @@ struct cred *prepare_creds(void) get_user_ns(new->user_ns); #ifdef CONFIG_KEYS + key_get(new->session_keyring); + key_get(new->process_keyring); key_get(new->thread_keyring); key_get(new->request_key_auth); - atomic_inc(&new->tgcred->usage); #endif #ifdef CONFIG_SECURITY @@ -334,39 +283,20 @@ EXPORT_SYMBOL(prepare_creds); */ struct cred *prepare_exec_creds(void) { - struct thread_group_cred *tgcred = NULL; struct cred *new; -#ifdef CONFIG_KEYS - tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL); - if (!tgcred) - return NULL; -#endif - new = prepare_creds(); - if (!new) { - kfree(tgcred); + if (!new) return new; - } #ifdef CONFIG_KEYS /* newly exec'd tasks don't get a thread keyring */ key_put(new->thread_keyring); new->thread_keyring = NULL; - /* create a new per-thread-group creds for all this set of threads to - * share */ - memcpy(tgcred, new->tgcred, sizeof(struct thread_group_cred)); - - atomic_set(&tgcred->usage, 1); - spin_lock_init(&tgcred->lock); - /* inherit the session keyring; new process keyring */ - key_get(tgcred->session_keyring); - tgcred->process_keyring = NULL; - - release_tgcred(new); - new->tgcred = tgcred; + key_put(new->process_keyring); + new->process_keyring = NULL; #endif return new; @@ -383,9 +313,6 @@ struct cred *prepare_exec_creds(void) */ int copy_creds(struct task_struct *p, unsigned long clone_flags) { -#ifdef CONFIG_KEYS - struct thread_group_cred *tgcred; -#endif struct cred *new; int ret; @@ -425,22 +352,12 @@ int copy_creds(struct task_struct *p, unsigned long clone_flags) install_thread_keyring_to_cred(new); } - /* we share the process and session keyrings between all the threads in - * a process - this is slightly icky as we violate COW credentials a - * bit */ + /* The process keyring is only shared between the threads in a process; + * anything outside of those threads doesn't inherit. + */ if (!(clone_flags & CLONE_THREAD)) { - tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL); - if (!tgcred) { - ret = -ENOMEM; - goto error_put; - } - atomic_set(&tgcred->usage, 1); - spin_lock_init(&tgcred->lock); - tgcred->process_keyring = NULL; - tgcred->session_keyring = key_get(new->tgcred->session_keyring); - - release_tgcred(new); - new->tgcred = tgcred; + key_put(new->process_keyring); + new->process_keyring = NULL; } #endif @@ -643,9 +560,6 @@ void __init cred_init(void) */ struct cred *prepare_kernel_cred(struct task_struct *daemon) { -#ifdef CONFIG_KEYS - struct thread_group_cred *tgcred; -#endif const struct cred *old; struct cred *new; @@ -653,14 +567,6 @@ struct cred *prepare_kernel_cred(struct task_struct *daemon) if (!new) return NULL; -#ifdef CONFIG_KEYS - tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL); - if (!tgcred) { - kmem_cache_free(cred_jar, new); - return NULL; - } -#endif - kdebug("prepare_kernel_cred() alloc %p", new); if (daemon) @@ -678,13 +584,10 @@ struct cred *prepare_kernel_cred(struct task_struct *daemon) get_group_info(new->group_info); #ifdef CONFIG_KEYS - atomic_set(&tgcred->usage, 1); - spin_lock_init(&tgcred->lock); - tgcred->process_keyring = NULL; - tgcred->session_keyring = NULL; - new->tgcred = tgcred; - new->request_key_auth = NULL; + new->session_keyring = NULL; + new->process_keyring = NULL; new->thread_keyring = NULL; + new->request_key_auth = NULL; new->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; #endif diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index a0d373f76815..65b38417c211 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -1475,7 +1475,8 @@ long keyctl_session_to_parent(void) goto error_keyring; newwork = &cred->rcu; - cred->tgcred->session_keyring = key_ref_to_ptr(keyring_r); + cred->session_keyring = key_ref_to_ptr(keyring_r); + keyring_r = NULL; init_task_work(newwork, key_change_session_keyring); me = current; @@ -1500,7 +1501,7 @@ long keyctl_session_to_parent(void) mycred = current_cred(); pcred = __task_cred(parent); if (mycred == pcred || - mycred->tgcred->session_keyring == pcred->tgcred->session_keyring) { + mycred->session_keyring == pcred->session_keyring) { ret = 0; goto unlock; } @@ -1516,9 +1517,9 @@ long keyctl_session_to_parent(void) goto unlock; /* the keyrings must have the same UID */ - if ((pcred->tgcred->session_keyring && - pcred->tgcred->session_keyring->uid != mycred->euid) || - mycred->tgcred->session_keyring->uid != mycred->euid) + if ((pcred->session_keyring && + pcred->session_keyring->uid != mycred->euid) || + mycred->session_keyring->uid != mycred->euid) goto unlock; /* cancel an already pending keyring replacement */ diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c index 178b8c3b130a..9de5dc598276 100644 --- a/security/keys/process_keys.c +++ b/security/keys/process_keys.c @@ -169,9 +169,8 @@ static int install_thread_keyring(void) int install_process_keyring_to_cred(struct cred *new) { struct key *keyring; - int ret; - if (new->tgcred->process_keyring) + if (new->process_keyring) return -EEXIST; keyring = keyring_alloc("_pid", new->uid, new->gid, @@ -179,17 +178,8 @@ int install_process_keyring_to_cred(struct cred *new) if (IS_ERR(keyring)) return PTR_ERR(keyring); - spin_lock_irq(&new->tgcred->lock); - if (!new->tgcred->process_keyring) { - new->tgcred->process_keyring = keyring; - keyring = NULL; - ret = 0; - } else { - ret = -EEXIST; - } - spin_unlock_irq(&new->tgcred->lock); - key_put(keyring); - return ret; + new->process_keyring = keyring; + return 0; } /* @@ -230,7 +220,7 @@ int install_session_keyring_to_cred(struct cred *cred, struct key *keyring) /* create an empty session keyring */ if (!keyring) { flags = KEY_ALLOC_QUOTA_OVERRUN; - if (cred->tgcred->session_keyring) + if (cred->session_keyring) flags = KEY_ALLOC_IN_QUOTA; keyring = keyring_alloc("_ses", cred->uid, cred->gid, @@ -242,17 +232,11 @@ int install_session_keyring_to_cred(struct cred *cred, struct key *keyring) } /* install the keyring */ - spin_lock_irq(&cred->tgcred->lock); - old = cred->tgcred->session_keyring; - rcu_assign_pointer(cred->tgcred->session_keyring, keyring); - spin_unlock_irq(&cred->tgcred->lock); - - /* we're using RCU on the pointer, but there's no point synchronising - * on it if it didn't previously point to anything */ - if (old) { - synchronize_rcu(); + old = cred->session_keyring; + rcu_assign_pointer(cred->session_keyring, keyring); + + if (old) key_put(old); - } return 0; } @@ -367,9 +351,9 @@ key_ref_t search_my_process_keyrings(struct key_type *type, } /* search the process keyring second */ - if (cred->tgcred->process_keyring) { + if (cred->process_keyring) { key_ref = keyring_search_aux( - make_key_ref(cred->tgcred->process_keyring, 1), + make_key_ref(cred->process_keyring, 1), cred, type, description, match, no_state_check); if (!IS_ERR(key_ref)) goto found; @@ -388,12 +372,10 @@ key_ref_t search_my_process_keyrings(struct key_type *type, } /* search the session keyring */ - if (cred->tgcred->session_keyring) { + if (cred->session_keyring) { rcu_read_lock(); key_ref = keyring_search_aux( - make_key_ref(rcu_dereference( - cred->tgcred->session_keyring), - 1), + make_key_ref(rcu_dereference(cred->session_keyring), 1), cred, type, description, match, no_state_check); rcu_read_unlock(); @@ -563,7 +545,7 @@ try_again: break; case KEY_SPEC_PROCESS_KEYRING: - if (!cred->tgcred->process_keyring) { + if (!cred->process_keyring) { if (!(lflags & KEY_LOOKUP_CREATE)) goto error; @@ -575,13 +557,13 @@ try_again: goto reget_creds; } - key = cred->tgcred->process_keyring; + key = cred->process_keyring; atomic_inc(&key->usage); key_ref = make_key_ref(key, 1); break; case KEY_SPEC_SESSION_KEYRING: - if (!cred->tgcred->session_keyring) { + if (!cred->session_keyring) { /* always install a session keyring upon access if one * doesn't exist yet */ ret = install_user_keyrings(); @@ -596,7 +578,7 @@ try_again: if (ret < 0) goto error; goto reget_creds; - } else if (cred->tgcred->session_keyring == + } else if (cred->session_keyring == cred->user->session_keyring && lflags & KEY_LOOKUP_CREATE) { ret = join_session_keyring(NULL); @@ -606,7 +588,7 @@ try_again: } rcu_read_lock(); - key = rcu_dereference(cred->tgcred->session_keyring); + key = rcu_dereference(cred->session_keyring); atomic_inc(&key->usage); rcu_read_unlock(); key_ref = make_key_ref(key, 1); @@ -766,12 +748,6 @@ long join_session_keyring(const char *name) struct key *keyring; long ret, serial; - /* only permit this if there's a single thread in the thread group - - * this avoids us having to adjust the creds on all threads and risking - * ENOMEM */ - if (!current_is_single_threaded()) - return -EMLINK; - new = prepare_creds(); if (!new) return -ENOMEM; @@ -783,7 +759,7 @@ long join_session_keyring(const char *name) if (ret < 0) goto error; - serial = new->tgcred->session_keyring->serial; + serial = new->session_keyring->serial; ret = commit_creds(new); if (ret == 0) ret = serial; @@ -806,6 +782,9 @@ long join_session_keyring(const char *name) } else if (IS_ERR(keyring)) { ret = PTR_ERR(keyring); goto error2; + } else if (keyring == new->session_keyring) { + ret = 0; + goto error2; } /* we've got a keyring - now to install it */ @@ -862,8 +841,7 @@ void key_change_session_keyring(struct callback_head *twork) new->jit_keyring = old->jit_keyring; new->thread_keyring = key_get(old->thread_keyring); - new->tgcred->tgid = old->tgcred->tgid; - new->tgcred->process_keyring = key_get(old->tgcred->process_keyring); + new->process_keyring = key_get(old->process_keyring); security_transfer_creds(new, old); diff --git a/security/keys/request_key.c b/security/keys/request_key.c index 000e75017520..275c4f9e4b8c 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -150,12 +150,12 @@ static int call_sbin_request_key(struct key_construction *cons, cred->thread_keyring ? cred->thread_keyring->serial : 0); prkey = 0; - if (cred->tgcred->process_keyring) - prkey = cred->tgcred->process_keyring->serial; + if (cred->process_keyring) + prkey = cred->process_keyring->serial; sprintf(keyring_str[1], "%d", prkey); rcu_read_lock(); - session = rcu_dereference(cred->tgcred->session_keyring); + session = rcu_dereference(cred->session_keyring); if (!session) session = cred->user->session_keyring; sskey = session->serial; @@ -297,14 +297,14 @@ static void construct_get_dest_keyring(struct key **_dest_keyring) break; case KEY_REQKEY_DEFL_PROCESS_KEYRING: - dest_keyring = key_get(cred->tgcred->process_keyring); + dest_keyring = key_get(cred->process_keyring); if (dest_keyring) break; case KEY_REQKEY_DEFL_SESSION_KEYRING: rcu_read_lock(); dest_keyring = key_get( - rcu_dereference(cred->tgcred->session_keyring)); + rcu_dereference(cred->session_keyring)); rcu_read_unlock(); if (dest_keyring) -- cgit v1.2.3 From 96b5c8fea6c0861621051290d705ec2e971963f1 Mon Sep 17 00:00:00 2001 From: David Howells Date: Tue, 2 Oct 2012 19:24:56 +0100 Subject: KEYS: Reduce initial permissions on keys Reduce the initial permissions on new keys to grant the possessor everything, view permission only to the user (so the keys can be seen in /proc/keys) and nothing else. This gives the creator a chance to adjust the permissions mask before other processes can access the new key or create a link to it. To aid with this, keyring_alloc() now takes a permission argument rather than setting the permissions itself. The following permissions are now set: (1) The user and user-session keyrings grant the user that owns them full permissions and grant a possessor everything bar SETATTR. (2) The process and thread keyrings grant the possessor full permissions but only grant the user VIEW. This permits the user to see them in /proc/keys, but not to do anything with them. (3) Anonymous session keyrings grant the possessor full permissions, but only grant the user VIEW and READ. This means that the user can see them in /proc/keys and can list them, but nothing else. Possibly READ shouldn't be provided either. (4) Named session keyrings grant everything an anonymous session keyring does, plus they grant the user LINK permission. The whole point of named session keyrings is that others can also subscribe to them. Possibly this should be a separate permission to LINK. (5) The temporary session keyring created by call_sbin_request_key() gets the same permissions as an anonymous session keyring. (6) Keys created by add_key() get VIEW, SEARCH, LINK and SETATTR for the possessor, plus READ and/or WRITE if the key type supports them. The used only gets VIEW now. (7) Keys created by request_key() now get the same as those created by add_key(). Reported-by: Lennart Poettering Reported-by: Stef Walter Signed-off-by: David Howells --- include/linux/key.h | 1 + security/keys/key.c | 6 +++--- security/keys/keyring.c | 9 +++------ security/keys/process_keys.c | 26 +++++++++++++++++--------- security/keys/request_key.c | 11 ++++++++++- 5 files changed, 34 insertions(+), 19 deletions(-) (limited to 'include') diff --git a/include/linux/key.h b/include/linux/key.h index cef3b315ba7c..890699815212 100644 --- a/include/linux/key.h +++ b/include/linux/key.h @@ -264,6 +264,7 @@ extern int key_unlink(struct key *keyring, extern struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid, const struct cred *cred, + key_perm_t perm, unsigned long flags, struct key *dest); diff --git a/security/keys/key.c b/security/keys/key.c index 50d96d4e06f2..bebeca3a78e4 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -826,13 +826,13 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref, /* if the client doesn't provide, decide on the permissions we want */ if (perm == KEY_PERM_UNDEF) { perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR; - perm |= KEY_USR_VIEW | KEY_USR_SEARCH | KEY_USR_LINK | KEY_USR_SETATTR; + perm |= KEY_USR_VIEW; if (ktype->read) - perm |= KEY_POS_READ | KEY_USR_READ; + perm |= KEY_POS_READ; if (ktype == &key_type_keyring || ktype->update) - perm |= KEY_USR_WRITE; + perm |= KEY_POS_WRITE; } /* allocate a new key */ diff --git a/security/keys/keyring.c b/security/keys/keyring.c index 81e7852d281d..cf704a92083f 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -257,17 +257,14 @@ error: * Allocate a keyring and link into the destination keyring. */ struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid, - const struct cred *cred, unsigned long flags, - struct key *dest) + const struct cred *cred, key_perm_t perm, + unsigned long flags, struct key *dest) { struct key *keyring; int ret; keyring = key_alloc(&key_type_keyring, description, - uid, gid, cred, - (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL, - flags); - + uid, gid, cred, perm, flags); if (!IS_ERR(keyring)) { ret = key_instantiate_and_link(keyring, NULL, 0, dest, NULL); if (ret < 0) { diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c index 9de5dc598276..b58d93892740 100644 --- a/security/keys/process_keys.c +++ b/security/keys/process_keys.c @@ -46,9 +46,11 @@ int install_user_keyrings(void) struct user_struct *user; const struct cred *cred; struct key *uid_keyring, *session_keyring; + key_perm_t user_keyring_perm; char buf[20]; int ret; + user_keyring_perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL; cred = current_cred(); user = cred->user; @@ -72,8 +74,8 @@ int install_user_keyrings(void) uid_keyring = find_keyring_by_name(buf, true); if (IS_ERR(uid_keyring)) { uid_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, - cred, KEY_ALLOC_IN_QUOTA, - NULL); + cred, user_keyring_perm, + KEY_ALLOC_IN_QUOTA, NULL); if (IS_ERR(uid_keyring)) { ret = PTR_ERR(uid_keyring); goto error; @@ -88,7 +90,8 @@ int install_user_keyrings(void) if (IS_ERR(session_keyring)) { session_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, - cred, KEY_ALLOC_IN_QUOTA, NULL); + cred, user_keyring_perm, + KEY_ALLOC_IN_QUOTA, NULL); if (IS_ERR(session_keyring)) { ret = PTR_ERR(session_keyring); goto error_release; @@ -129,6 +132,7 @@ int install_thread_keyring_to_cred(struct cred *new) struct key *keyring; keyring = keyring_alloc("_tid", new->uid, new->gid, new, + KEY_POS_ALL | KEY_USR_VIEW, KEY_ALLOC_QUOTA_OVERRUN, NULL); if (IS_ERR(keyring)) return PTR_ERR(keyring); @@ -173,8 +177,9 @@ int install_process_keyring_to_cred(struct cred *new) if (new->process_keyring) return -EEXIST; - keyring = keyring_alloc("_pid", new->uid, new->gid, - new, KEY_ALLOC_QUOTA_OVERRUN, NULL); + keyring = keyring_alloc("_pid", new->uid, new->gid, new, + KEY_POS_ALL | KEY_USR_VIEW, + KEY_ALLOC_QUOTA_OVERRUN, NULL); if (IS_ERR(keyring)) return PTR_ERR(keyring); @@ -223,8 +228,9 @@ int install_session_keyring_to_cred(struct cred *cred, struct key *keyring) if (cred->session_keyring) flags = KEY_ALLOC_IN_QUOTA; - keyring = keyring_alloc("_ses", cred->uid, cred->gid, - cred, flags, NULL); + keyring = keyring_alloc("_ses", cred->uid, cred->gid, cred, + KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ, + flags, NULL); if (IS_ERR(keyring)) return PTR_ERR(keyring); } else { @@ -773,8 +779,10 @@ long join_session_keyring(const char *name) keyring = find_keyring_by_name(name, false); if (PTR_ERR(keyring) == -ENOKEY) { /* not found - try and create a new one */ - keyring = keyring_alloc(name, old->uid, old->gid, old, - KEY_ALLOC_IN_QUOTA, NULL); + keyring = keyring_alloc( + name, old->uid, old->gid, old, + KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_LINK, + KEY_ALLOC_IN_QUOTA, NULL); if (IS_ERR(keyring)) { ret = PTR_ERR(keyring); goto error2; diff --git a/security/keys/request_key.c b/security/keys/request_key.c index 275c4f9e4b8c..0ae3a2202771 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -126,6 +126,7 @@ static int call_sbin_request_key(struct key_construction *cons, cred = get_current_cred(); keyring = keyring_alloc(desc, cred->fsuid, cred->fsgid, cred, + KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ, KEY_ALLOC_QUOTA_OVERRUN, NULL); put_cred(cred); if (IS_ERR(keyring)) { @@ -347,6 +348,7 @@ static int construct_alloc_key(struct key_type *type, const struct cred *cred = current_cred(); unsigned long prealloc; struct key *key; + key_perm_t perm; key_ref_t key_ref; int ret; @@ -355,8 +357,15 @@ static int construct_alloc_key(struct key_type *type, *_key = NULL; mutex_lock(&user->cons_lock); + perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR; + perm |= KEY_USR_VIEW; + if (type->read) + perm |= KEY_POS_READ; + if (type == &key_type_keyring || type->update) + perm |= KEY_POS_WRITE; + key = key_alloc(type, description, cred->fsuid, cred->fsgid, cred, - KEY_POS_ALL, flags); + perm, flags); if (IS_ERR(key)) goto alloc_failed; -- cgit v1.2.3