diff options
Diffstat (limited to 'security')
| -rw-r--r-- | security/keys/Kconfig | 9 | ||||
| -rw-r--r-- | security/keys/compat.c | 3 | ||||
| -rw-r--r-- | security/keys/gc.c | 5 | ||||
| -rw-r--r-- | security/keys/internal.h | 38 | ||||
| -rw-r--r-- | security/keys/key.c | 38 | ||||
| -rw-r--r-- | security/keys/keyctl.c | 115 | ||||
| -rw-r--r-- | security/keys/keyring.c | 20 | ||||
| -rw-r--r-- | security/keys/permission.c | 31 | ||||
| -rw-r--r-- | security/keys/process_keys.c | 46 | ||||
| -rw-r--r-- | security/keys/request_key.c | 4 | ||||
| -rw-r--r-- | security/security.c | 22 | ||||
| -rw-r--r-- | security/selinux/hooks.c | 51 | ||||
| -rw-r--r-- | security/smack/smack_lsm.c | 112 |
13 files changed, 407 insertions, 87 deletions
diff --git a/security/keys/Kconfig b/security/keys/Kconfig index 8153ea01d7bb..83bc23409164 100644 --- a/security/keys/Kconfig +++ b/security/keys/Kconfig @@ -114,3 +114,12 @@ config KEY_DH_OPERATIONS in the kernel. If you are unsure as to whether this is required, answer N. + +config KEY_NOTIFICATIONS + bool "Provide key/keyring change notifications" + depends on KEYS && WATCH_QUEUE + help + This option provides support for getting change notifications on keys + and keyrings on which the caller has View permission. This makes use + of the /dev/watch_queue misc device to handle the notification + buffer and provides KEYCTL_WATCH_KEY to enable/disable watches. diff --git a/security/keys/compat.c b/security/keys/compat.c index b975f8f11124..6ee9d8f6a4a5 100644 --- a/security/keys/compat.c +++ b/security/keys/compat.c @@ -156,6 +156,9 @@ COMPAT_SYSCALL_DEFINE5(keyctl, u32, option, case KEYCTL_CAPABILITIES: return keyctl_capabilities(compat_ptr(arg2), arg3); + case KEYCTL_WATCH_KEY: + return keyctl_watch_key(arg2, arg3, arg4); + default: return -EOPNOTSUPP; } diff --git a/security/keys/gc.c b/security/keys/gc.c index 671dd730ecfc..3c90807476eb 100644 --- a/security/keys/gc.c +++ b/security/keys/gc.c @@ -131,6 +131,11 @@ static noinline void key_gc_unused_keys(struct list_head *keys) kdebug("- %u", key->serial); key_check(key); +#ifdef CONFIG_KEY_NOTIFICATIONS + remove_watch_list(key->watchers, key->serial); + key->watchers = NULL; +#endif + /* Throw away the key data if the key is instantiated */ if (state == KEY_IS_POSITIVE && key->type->destroy) key->type->destroy(key); diff --git a/security/keys/internal.h b/security/keys/internal.h index 153d35c20d3d..338a526cbfa5 100644 --- a/security/keys/internal.h +++ b/security/keys/internal.h @@ -15,6 +15,7 @@ #include <linux/task_work.h> #include <linux/keyctl.h> #include <linux/refcount.h> +#include <linux/watch_queue.h> #include <linux/compat.h> #include <linux/mm.h> #include <linux/vmalloc.h> @@ -99,7 +100,8 @@ extern int __key_link_begin(struct key *keyring, const struct keyring_index_key *index_key, struct assoc_array_edit **_edit); extern int __key_link_check_live_key(struct key *keyring, struct key *key); -extern void __key_link(struct key *key, struct assoc_array_edit **_edit); +extern void __key_link(struct key *keyring, struct key *key, + struct assoc_array_edit **_edit); extern void __key_link_end(struct key *keyring, const struct keyring_index_key *index_key, struct assoc_array_edit *edit); @@ -165,7 +167,6 @@ extern bool lookup_user_key_possessed(const struct key *key, const struct key_match_data *match_data); #define KEY_LOOKUP_CREATE 0x01 #define KEY_LOOKUP_PARTIAL 0x02 -#define KEY_LOOKUP_FOR_UNLINK 0x04 extern long join_session_keyring(const char *name); extern void key_change_session_keyring(struct callback_head *twork); @@ -181,14 +182,32 @@ extern void key_gc_keytype(struct key_type *ktype); extern int key_task_permission(const key_ref_t key_ref, const struct cred *cred, - key_perm_t perm); + enum key_need_perm need_perm); + +static inline void notify_key(struct key *key, + enum key_notification_subtype subtype, u32 aux) +{ +#ifdef CONFIG_KEY_NOTIFICATIONS + struct key_notification n = { + .watch.type = WATCH_TYPE_KEY_NOTIFY, + .watch.subtype = subtype, + .watch.info = watch_sizeof(n), + .key_id = key_serial(key), + .aux = aux, + }; + + post_watch_notification(key->watchers, &n.watch, current_cred(), + n.key_id); +#endif +} /* * Check to see whether permission is granted to use a key in the desired way. */ -static inline int key_permission(const key_ref_t key_ref, unsigned perm) +static inline int key_permission(const key_ref_t key_ref, + enum key_need_perm need_perm) { - return key_task_permission(key_ref, current_cred(), perm); + return key_task_permission(key_ref, current_cred(), need_perm); } extern struct key_type key_type_request_key_auth; @@ -333,6 +352,15 @@ static inline long keyctl_pkey_e_d_s(int op, extern long keyctl_capabilities(unsigned char __user *_buffer, size_t buflen); +#ifdef CONFIG_KEY_NOTIFICATIONS +extern long keyctl_watch_key(key_serial_t, int, int); +#else +static inline long keyctl_watch_key(key_serial_t key_id, int watch_fd, int watch_id) +{ + return -EOPNOTSUPP; +} +#endif + /* * Debugging key validation */ diff --git a/security/keys/key.c b/security/keys/key.c index e959b3c96b48..e282c6179b21 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -444,6 +444,7 @@ static int __key_instantiate_and_link(struct key *key, /* mark the key as being instantiated */ atomic_inc(&key->user->nikeys); mark_key_instantiated(key, 0); + notify_key(key, NOTIFY_KEY_INSTANTIATED, 0); if (test_and_clear_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags)) awaken = 1; @@ -453,7 +454,7 @@ static int __key_instantiate_and_link(struct key *key, if (test_bit(KEY_FLAG_KEEP, &keyring->flags)) set_bit(KEY_FLAG_KEEP, &key->flags); - __key_link(key, _edit); + __key_link(keyring, key, _edit); } /* disable the authorisation key */ @@ -601,6 +602,7 @@ int key_reject_and_link(struct key *key, /* mark the key as being negatively instantiated */ atomic_inc(&key->user->nikeys); mark_key_instantiated(key, -error); + notify_key(key, NOTIFY_KEY_INSTANTIATED, -error); key->expiry = ktime_get_real_seconds() + timeout; key_schedule_gc(key->expiry + key_gc_delay); @@ -611,7 +613,7 @@ int key_reject_and_link(struct key *key, /* and link it into the destination keyring */ if (keyring && link_ret == 0) - __key_link(key, &edit); + __key_link(keyring, key, &edit); /* disable the authorisation key */ if (authkey) @@ -764,9 +766,11 @@ static inline key_ref_t __key_update(key_ref_t key_ref, down_write(&key->sem); ret = key->type->update(key, prep); - if (ret == 0) + if (ret == 0) { /* Updating a negative key positively instantiates it */ mark_key_instantiated(key, 0); + notify_key(key, NOTIFY_KEY_UPDATED, 0); + } up_write(&key->sem); @@ -1023,9 +1027,11 @@ int key_update(key_ref_t key_ref, const void *payload, size_t plen) down_write(&key->sem); ret = key->type->update(key, &prep); - if (ret == 0) + if (ret == 0) { /* Updating a negative key positively instantiates it */ mark_key_instantiated(key, 0); + notify_key(key, NOTIFY_KEY_UPDATED, 0); + } up_write(&key->sem); @@ -1057,15 +1063,17 @@ void key_revoke(struct key *key) * instantiated */ down_write_nested(&key->sem, 1); - if (!test_and_set_bit(KEY_FLAG_REVOKED, &key->flags) && - key->type->revoke) - key->type->revoke(key); - - /* set the death time to no more than the expiry time */ - time = ktime_get_real_seconds(); - if (key->revoked_at == 0 || key->revoked_at > time) { - key->revoked_at = time; - key_schedule_gc(key->revoked_at + key_gc_delay); + if (!test_and_set_bit(KEY_FLAG_REVOKED, &key->flags)) { + notify_key(key, NOTIFY_KEY_REVOKED, 0); + if (key->type->revoke) + key->type->revoke(key); + + /* set the death time to no more than the expiry time */ + time = ktime_get_real_seconds(); + if (key->revoked_at == 0 || key->revoked_at > time) { + key->revoked_at = time; + key_schedule_gc(key->revoked_at + key_gc_delay); + } } up_write(&key->sem); @@ -1087,8 +1095,10 @@ void key_invalidate(struct key *key) if (!test_bit(KEY_FLAG_INVALIDATED, &key->flags)) { down_write_nested(&key->sem, 1); - if (!test_and_set_bit(KEY_FLAG_INVALIDATED, &key->flags)) + if (!test_and_set_bit(KEY_FLAG_INVALIDATED, &key->flags)) { + notify_key(key, NOTIFY_KEY_INVALIDATED, 0); key_schedule_gc_links(); + } up_write(&key->sem); } } diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index e5ef20a0d05e..9febd37a168f 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -37,7 +37,9 @@ static const unsigned char keyrings_capabilities[2] = { KEYCTL_CAPS0_MOVE ), [1] = (KEYCTL_CAPS1_NS_KEYRING_NAME | - KEYCTL_CAPS1_NS_KEY_TAG), + KEYCTL_CAPS1_NS_KEY_TAG | + (IS_ENABLED(CONFIG_KEY_NOTIFICATIONS) ? KEYCTL_CAPS1_NOTIFICATIONS : 0) + ), }; static int key_get_type_from_user(char *type, @@ -429,7 +431,7 @@ long keyctl_invalidate_key(key_serial_t id) /* Root is permitted to invalidate certain special keys */ if (capable(CAP_SYS_ADMIN)) { - key_ref = lookup_user_key(id, 0, 0); + key_ref = lookup_user_key(id, 0, KEY_SYSADMIN_OVERRIDE); if (IS_ERR(key_ref)) goto error; if (test_bit(KEY_FLAG_ROOT_CAN_INVAL, @@ -474,7 +476,8 @@ long keyctl_keyring_clear(key_serial_t ringid) /* Root is permitted to invalidate certain special keyrings */ if (capable(CAP_SYS_ADMIN)) { - keyring_ref = lookup_user_key(ringid, 0, 0); + keyring_ref = lookup_user_key(ringid, 0, + KEY_SYSADMIN_OVERRIDE); if (IS_ERR(keyring_ref)) goto error; if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, @@ -558,7 +561,7 @@ long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) goto error; } - key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); + key_ref = lookup_user_key(id, KEY_LOOKUP_PARTIAL, KEY_NEED_UNLINK); if (IS_ERR(key_ref)) { ret = PTR_ERR(key_ref); goto error2; @@ -658,7 +661,7 @@ long keyctl_describe_key(key_serial_t keyid, key_put(instkey); key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, - 0); + KEY_AUTHTOKEN_OVERRIDE); if (!IS_ERR(key_ref)) goto okay; } @@ -828,7 +831,7 @@ long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) size_t key_data_len; /* find the key first */ - key_ref = lookup_user_key(keyid, 0, 0); + key_ref = lookup_user_key(keyid, 0, KEY_DEFER_PERM_CHECK); if (IS_ERR(key_ref)) { ret = -ENOKEY; goto out; @@ -1036,6 +1039,7 @@ long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) if (group != (gid_t) -1) key->gid = gid; + notify_key(key, NOTIFY_KEY_SETATTR, 0); ret = 0; error_put: @@ -1086,6 +1090,7 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm) /* if we're not the sysadmin, we can only change a key that we own */ if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { key->perm = perm; + notify_key(key, NOTIFY_KEY_SETATTR, 0); ret = 0; } @@ -1461,7 +1466,7 @@ long keyctl_set_timeout(key_serial_t id, unsigned timeout) key_put(instkey); key_ref = lookup_user_key(id, KEY_LOOKUP_PARTIAL, - 0); + KEY_AUTHTOKEN_OVERRIDE); if (!IS_ERR(key_ref)) goto okay; } @@ -1474,10 +1479,12 @@ long keyctl_set_timeout(key_serial_t id, unsigned timeout) okay: key = key_ref_to_ptr(key_ref); ret = 0; - if (test_bit(KEY_FLAG_KEEP, &key->flags)) + if (test_bit(KEY_FLAG_KEEP, &key->flags)) { ret = -EPERM; - else + } else { key_set_timeout(key, timeout); + notify_key(key, NOTIFY_KEY_SETATTR, 0); + } key_put(key); error: @@ -1567,7 +1574,8 @@ long keyctl_get_security(key_serial_t keyid, return PTR_ERR(instkey); key_put(instkey); - key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); + key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, + KEY_AUTHTOKEN_OVERRIDE); if (IS_ERR(key_ref)) return PTR_ERR(key_ref); } @@ -1751,6 +1759,90 @@ error: return ret; } +#ifdef CONFIG_KEY_NOTIFICATIONS +/* + * Watch for changes to a key. + * + * The caller must have View permission to watch a key or keyring. + */ +long keyctl_watch_key(key_serial_t id, int watch_queue_fd, int watch_id) +{ + struct watch_queue *wqueue; + struct watch_list *wlist = NULL; + struct watch *watch = NULL; + struct key *key; + key_ref_t key_ref; + long ret; + + if (watch_id < -1 || watch_id > 0xff) + return -EINVAL; + + key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_VIEW); + if (IS_ERR(key_ref)) + return PTR_ERR(key_ref); + key = key_ref_to_ptr(key_ref); + + wqueue = get_watch_queue(watch_queue_fd); + if (IS_ERR(wqueue)) { + ret = PTR_ERR(wqueue); + goto err_key; + } + + if (watch_id >= 0) { + ret = -ENOMEM; + if (!key->watchers) { + wlist = kzalloc(sizeof(*wlist), GFP_KERNEL); + if (!wlist) + goto err_wqueue; + init_watch_list(wlist, NULL); + } + + watch = kzalloc(sizeof(*watch), GFP_KERNEL); + if (!watch) + goto err_wlist; + + init_watch(watch, wqueue); + watch->id = key->serial; + watch->info_id = (u32)watch_id << WATCH_INFO_ID__SHIFT; + + ret = security_watch_key(key); + if (ret < 0) + goto err_watch; + + down_write(&key->sem); + if (!key->watchers) { + key->watchers = wlist; + wlist = NULL; + } + + ret = add_watch_to_object(watch, key->watchers); + up_write(&key->sem); + + if (ret == 0) + watch = NULL; + } else { + ret = -EBADSLT; + if (key->watchers) { + down_write(&key->sem); + ret = remove_watch_from_object(key->watchers, + wqueue, key_serial(key), + false); + up_write(&key->sem); + } + } + +err_watch: + kfree(watch); +err_wlist: + kfree(wlist); +err_wqueue: + put_watch_queue(wqueue); +err_key: + key_put(key); + return ret; +} +#endif /* CONFIG_KEY_NOTIFICATIONS */ + /* * Get keyrings subsystem capabilities. */ @@ -1920,6 +2012,9 @@ SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, case KEYCTL_CAPABILITIES: return keyctl_capabilities((unsigned char __user *)arg2, (size_t)arg3); + case KEYCTL_WATCH_KEY: + return keyctl_watch_key((key_serial_t)arg2, (int)arg3, (int)arg4); + default: return -EOPNOTSUPP; } diff --git a/security/keys/keyring.c b/security/keys/keyring.c index 5ca620d31cd3..14abfe765b7e 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -1056,12 +1056,14 @@ int keyring_restrict(key_ref_t keyring_ref, const char *type, down_write(&keyring->sem); down_write(&keyring_serialise_restrict_sem); - if (keyring->restrict_link) + if (keyring->restrict_link) { ret = -EEXIST; - else if (keyring_detect_restriction_cycle(keyring, restrict_link)) + } else if (keyring_detect_restriction_cycle(keyring, restrict_link)) { ret = -EDEADLK; - else + } else { keyring->restrict_link = restrict_link; + notify_key(keyring, NOTIFY_KEY_SETATTR, 0); + } up_write(&keyring_serialise_restrict_sem); up_write(&keyring->sem); @@ -1362,12 +1364,14 @@ int __key_link_check_live_key(struct key *keyring, struct key *key) * holds at most one link to any given key of a particular type+description * combination. */ -void __key_link(struct key *key, struct assoc_array_edit **_edit) +void __key_link(struct key *keyring, struct key *key, + struct assoc_array_edit **_edit) { __key_get(key); assoc_array_insert_set_object(*_edit, keyring_key_to_ptr(key)); assoc_array_apply_edit(*_edit); *_edit = NULL; + notify_key(keyring, NOTIFY_KEY_LINKED, key_serial(key)); } /* @@ -1451,7 +1455,7 @@ int key_link(struct key *keyring, struct key *key) if (ret == 0) ret = __key_link_check_live_key(keyring, key); if (ret == 0) - __key_link(key, &edit); + __key_link(keyring, key, &edit); error_end: __key_link_end(keyring, &key->index_key, edit); @@ -1483,7 +1487,7 @@ static int __key_unlink_begin(struct key *keyring, struct key *key, struct assoc_array_edit *edit; BUG_ON(*_edit != NULL); - + edit = assoc_array_delete(&keyring->keys, &keyring_assoc_array_ops, &key->index_key); if (IS_ERR(edit)) @@ -1503,6 +1507,7 @@ static void __key_unlink(struct key *keyring, struct key *key, struct assoc_array_edit **_edit) { assoc_array_apply_edit(*_edit); + notify_key(keyring, NOTIFY_KEY_UNLINKED, key_serial(key)); *_edit = NULL; key_payload_reserve(keyring, keyring->datalen - KEYQUOTA_LINK_BYTES); } @@ -1621,7 +1626,7 @@ int key_move(struct key *key, goto error; __key_unlink(from_keyring, key, &from_edit); - __key_link(key, &to_edit); + __key_link(to_keyring, key, &to_edit); error: __key_link_end(to_keyring, &key->index_key, to_edit); __key_unlink_end(from_keyring, key, from_edit); @@ -1655,6 +1660,7 @@ int keyring_clear(struct key *keyring) } else { if (edit) assoc_array_apply_edit(edit); + notify_key(keyring, NOTIFY_KEY_CLEARED, 0); key_payload_reserve(keyring, 0); ret = 0; } diff --git a/security/keys/permission.c b/security/keys/permission.c index 085f907b64ac..4a61f804e80f 100644 --- a/security/keys/permission.c +++ b/security/keys/permission.c @@ -13,7 +13,7 @@ * key_task_permission - Check a key can be used * @key_ref: The key to check. * @cred: The credentials to use. - * @perm: The permissions to check for. + * @need_perm: The permission required. * * Check to see whether permission is granted to use a key in the desired way, * but permit the security modules to override. @@ -24,12 +24,30 @@ * permissions bits or the LSM check. */ int key_task_permission(const key_ref_t key_ref, const struct cred *cred, - unsigned perm) + enum key_need_perm need_perm) { struct key *key; - key_perm_t kperm; + key_perm_t kperm, mask; int ret; + switch (need_perm) { + default: + WARN_ON(1); + return -EACCES; + case KEY_NEED_UNLINK: + case KEY_SYSADMIN_OVERRIDE: + case KEY_AUTHTOKEN_OVERRIDE: + case KEY_DEFER_PERM_CHECK: + goto lsm; + + case KEY_NEED_VIEW: mask = KEY_OTH_VIEW; break; + case KEY_NEED_READ: mask = KEY_OTH_READ; break; + case KEY_NEED_WRITE: mask = KEY_OTH_WRITE; break; + case KEY_NEED_SEARCH: mask = KEY_OTH_SEARCH; break; + case KEY_NEED_LINK: mask = KEY_OTH_LINK; break; + case KEY_NEED_SETATTR: mask = KEY_OTH_SETATTR; break; + } + key = key_ref_to_ptr(key_ref); /* use the second 8-bits of permissions for keys the caller owns */ @@ -64,13 +82,12 @@ use_these_perms: if (is_key_possessed(key_ref)) kperm |= key->perm >> 24; - kperm = kperm & perm & KEY_NEED_ALL; - - if (kperm != perm) + if ((kperm & mask) != mask) return -EACCES; /* let LSM be the final arbiter */ - return security_key_permission(key_ref, cred, perm); +lsm: + return security_key_permission(key_ref, cred, need_perm); } EXPORT_SYMBOL(key_task_permission); diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c index 09541de31f2f..7e0232db1707 100644 --- a/security/keys/process_keys.c +++ b/security/keys/process_keys.c @@ -609,7 +609,7 @@ bool lookup_user_key_possessed(const struct key *key, * returned key reference. */ key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags, - key_perm_t perm) + enum key_need_perm need_perm) { struct keyring_search_context ctx = { .match_data.cmp = lookup_user_key_possessed, @@ -773,35 +773,33 @@ try_again: /* unlink does not use the nominated key in any way, so can skip all * the permission checks as it is only concerned with the keyring */ - if (lflags & KEY_LOOKUP_FOR_UNLINK) { - ret = 0; - goto error; - } - - if (!(lflags & KEY_LOOKUP_PARTIAL)) { - ret = wait_for_key_construction(key, true); - switch (ret) { - case -ERESTARTSYS: - goto invalid_key; - default: - if (perm) + if (need_perm != KEY_NEED_UNLINK) { + if (!(lflags & KEY_LOOKUP_PARTIAL)) { + ret = wait_for_key_construction(key, true); + switch (ret) { + case -ERESTARTSYS: + goto invalid_key; + default: + if (need_perm != KEY_AUTHTOKEN_OVERRIDE && + need_perm != KEY_DEFER_PERM_CHECK) + goto invalid_key; + case 0: + break; + } + } else if (need_perm != KEY_DEFER_PERM_CHECK) { + ret = key_validate(key); + if (ret < 0) goto invalid_key; - case 0: - break; } - } else if (perm) { - ret = key_validate(key); - if (ret < 0) + + ret = -EIO; + if (!(lflags & KEY_LOOKUP_PARTIAL) && + key_read_state(key) == KEY_IS_UNINSTANTIATED) goto invalid_key; } - ret = -EIO; - if (!(lflags & KEY_LOOKUP_PARTIAL) && - key_read_state(key) == KEY_IS_UNINSTANTIATED) - goto invalid_key; - /* check the permissions */ - ret = key_task_permission(key_ref, ctx.cred, perm); + ret = key_task_permission(key_ref, ctx.cred, need_perm); if (ret < 0) goto invalid_key; diff --git a/security/keys/request_key.c b/security/keys/request_key.c index 957b9e3e1492..e1b9f1a80676 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -418,7 +418,7 @@ static int construct_alloc_key(struct keyring_search_context *ctx, goto key_already_present; if (dest_keyring) - __key_link(key, &edit); + __key_link(dest_keyring, key, &edit); mutex_unlock(&key_construction_mutex); if (dest_keyring) @@ -437,7 +437,7 @@ key_already_present: if (dest_keyring) { ret = __key_link_check_live_key(dest_keyring, key); if (ret == 0) - __key_link(key, &edit); + __key_link(dest_keyring, key, &edit); __key_link_end(dest_keyring, &ctx->index_key, edit); if (ret < 0) goto link_check_failed; diff --git a/security/security.c b/security/security.c index e0290b7e6a08..2a652e59c413 100644 --- a/security/security.c +++ b/security/security.c @@ -2030,6 +2030,22 @@ int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) } EXPORT_SYMBOL(security_inode_getsecctx); +#ifdef CONFIG_WATCH_QUEUE +int security_post_notification(const struct cred *w_cred, + const struct cred *cred, + struct watch_notification *n) +{ + return call_int_hook(post_notification, 0, w_cred, cred, n); +} +#endif /* CONFIG_WATCH_QUEUE */ + +#ifdef CONFIG_KEY_NOTIFICATIONS +int security_watch_key(struct key *key) +{ + return call_int_hook(watch_key, 0, key); +} +#endif + #ifdef CONFIG_SECURITY_NETWORK int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk) @@ -2405,10 +2421,10 @@ void security_key_free(struct key *key) call_void_hook(key_free, key); } -int security_key_permission(key_ref_t key_ref, - const struct cred *cred, unsigned perm) +int security_key_permission(key_ref_t key_ref, const struct cred *cred, + enum key_need_perm need_perm) { - return call_int_hook(key_permission, 0, key_ref, cred, perm); + return call_int_hook(key_permission, 0, key_ref, cred, need_perm); } int security_key_getsecurity(struct key *key, char **_buffer) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 7e954b555be6..efa6108b1ce9 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -6559,20 +6559,43 @@ static void selinux_key_free(struct key *k) static int selinux_key_permission(key_ref_t key_ref, const struct cred *cred, - unsigned perm) + enum key_need_perm need_perm) { struct key *key; struct key_security_struct *ksec; - u32 sid; + u32 perm, sid; - /* if no specific permissions are requested, we skip the - permission check. No serious, additional covert channels - appear to be created. */ - if (perm == 0) + switch (need_perm) { + case KEY_NEED_VIEW: + perm = KEY__VIEW; + break; + case KEY_NEED_READ: + perm = KEY__READ; + break; + case KEY_NEED_WRITE: + perm = KEY__WRITE; + break; + case KEY_NEED_SEARCH: + perm = KEY__SEARCH; + break; + case KEY_NEED_LINK: + perm = KEY__LINK; + break; + case KEY_NEED_SETATTR: + perm = KEY__SETATTR; + break; + case KEY_NEED_UNLINK: + case KEY_SYSADMIN_OVERRIDE: + case KEY_AUTHTOKEN_OVERRIDE: + case KEY_DEFER_PERM_CHECK: return 0; + default: + WARN_ON(1); + return -EPERM; - sid = cred_sid(cred); + } + sid = cred_sid(cred); key = key_ref_to_ptr(key_ref); ksec = key->security; @@ -6594,6 +6617,17 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer) *_buffer = context; return rc; } + +#ifdef CONFIG_KEY_NOTIFICATIONS +static int selinux_watch_key(struct key *key) +{ + struct key_security_struct *ksec = key->security; + u32 sid = current_sid(); + + return avc_has_perm(&selinux_state, + sid, ksec->sid, SECCLASS_KEY, KEY__VIEW, NULL); +} +#endif #endif #ifdef CONFIG_SECURITY_INFINIBAND @@ -7109,6 +7143,9 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(key_free, selinux_key_free), LSM_HOOK_INIT(key_permission, selinux_key_permission), LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity), +#ifdef CONFIG_KEY_NOTIFICATIONS + LSM_HOOK_INIT(watch_key, selinux_watch_key), +#endif #endif #ifdef CONFIG_AUDIT diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index cd44b79bf1f5..8ffbf951b7ed 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -41,6 +41,7 @@ #include <linux/parser.h> #include <linux/fs_context.h> #include <linux/fs_parser.h> +#include <linux/watch_queue.h> #include "smack.h" #define TRANS_TRUE "TRUE" @@ -4213,13 +4214,14 @@ static void smack_key_free(struct key *key) * smack_key_permission - Smack access on a key * @key_ref: gets to the object * @cred: the credentials to use - * @perm: requested key permissions + * @need_perm: requested key permission * * Return 0 if the task has read and write to the object, * an error code otherwise */ static int smack_key_permission(key_ref_t key_ref, - const struct cred *cred, unsigned perm) + const struct cred *cred, + enum key_need_perm need_perm) { struct key *keyp; struct smk_audit_info ad; @@ -4230,8 +4232,26 @@ static int smack_key_permission(key_ref_t key_ref, /* * Validate requested permissions */ - if (perm & ~KEY_NEED_ALL) + switch (need_perm) { + case KEY_NEED_READ: + case KEY_NEED_SEARCH: + case KEY_NEED_VIEW: + request |= MAY_READ; + break; + case KEY_NEED_WRITE: + case KEY_NEED_LINK: + case KEY_NEED_SETATTR: + request |= MAY_WRITE; + break; + case KEY_NEED_UNSPECIFIED: + case KEY_NEED_UNLINK: + case KEY_SYSADMIN_OVERRIDE: + case KEY_AUTHTOKEN_OVERRIDE: + case KEY_DEFER_PERM_CHECK: + return 0; + default: return -EINVAL; + } keyp = key_ref_to_ptr(key_ref); if (keyp == NULL) @@ -4248,7 +4268,7 @@ static int smack_key_permission(key_ref_t key_ref, if (tkp == NULL) return -EACCES; - if (smack_privileged_cred(CAP_MAC_OVERRIDE, cred)) + if (smack_privileged(CAP_MAC_OVERRIDE)) return 0; #ifdef CONFIG_AUDIT @@ -4256,10 +4276,6 @@ static int smack_key_permission(key_ref_t key_ref, ad.a.u.key_struct.key = keyp->serial; ad.a.u.key_struct.key_desc = keyp->description; #endif - if (perm & (KEY_NEED_READ | KEY_NEED_SEARCH | KEY_NEED_VIEW)) - request |= MAY_READ; - if (perm & (KEY_NEED_WRITE | KEY_NEED_LINK | KEY_NEED_SETATTR)) - request |= MAY_WRITE; rc = smk_access(tkp, keyp->security, request, &ad); rc = smk_bu_note("key access", tkp, keyp->security, request, rc); return rc; @@ -4294,8 +4310,81 @@ static int smack_key_getsecurity(struct key *key, char **_buffer) return length; } + +#ifdef CONFIG_KEY_NOTIFICATIONS +/** + * smack_watch_key - Smack access to watch a key for notifications. + * @key: The key to be watched + * + * Return 0 if the @watch->cred has permission to read from the key object and + * an error otherwise. + */ +static int smack_watch_key(struct key *key) +{ + struct smk_audit_info ad; + struct smack_known *tkp = smk_of_current(); + int rc; + + if (key == NULL) + return -EINVAL; + /* + * If the key hasn't been initialized give it access so that + * it may do so. + */ + if (key->security == NULL) + return 0; + /* + * This should not occur + */ + if (tkp == NULL) + return -EACCES; + + if (smack_privileged_cred(CAP_MAC_OVERRIDE, current_cred())) + return 0; + +#ifdef CONFIG_AUDIT + smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); + ad.a.u.key_struct.key = key->serial; + ad.a.u.key_struct.key_desc = key->description; +#endif + rc = smk_access(tkp, key->security, MAY_READ, &ad); + rc = smk_bu_note("key watch", tkp, key->security, MAY_READ, rc); + return rc; +} +#endif /* CONFIG_KEY_NOTIFICATIONS */ #endif /* CONFIG_KEYS */ +#ifdef CONFIG_WATCH_QUEUE +/** + * smack_post_notification - Smack access to post a notification to a queue + * @w_cred: The credentials of the watcher. + * @cred: The credentials of the event source (may be NULL). + * @n: The notification message to be posted. + */ +static int smack_post_notification(const struct cred *w_cred, + const struct cred *cred, + struct watch_notification *n) +{ + struct smk_audit_info ad; + struct smack_known *subj, *obj; + int rc; + + /* Always let maintenance notifications through. */ + if (n->type == WATCH_TYPE_META) + return 0; + + if (!cred) + return 0; + subj = smk_of_task(smack_cred(cred)); + obj = smk_of_task(smack_cred(w_cred)); + + smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NOTIFICATION); + rc = smk_access(subj, obj, MAY_WRITE, &ad); + rc = smk_bu_note("notification", subj, obj, MAY_WRITE, rc); + return rc; +} +#endif /* CONFIG_WATCH_QUEUE */ + /* * Smack Audit hooks * @@ -4684,8 +4773,15 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(key_free, smack_key_free), LSM_HOOK_INIT(key_permission, smack_key_permission), LSM_HOOK_INIT(key_getsecurity, smack_key_getsecurity), +#ifdef CONFIG_KEY_NOTIFICATIONS + LSM_HOOK_INIT(watch_key, smack_watch_key), +#endif #endif /* CONFIG_KEYS */ +#ifdef CONFIG_WATCH_QUEUE + LSM_HOOK_INIT(post_notification, smack_post_notification), +#endif + /* Audit hooks */ #ifdef CONFIG_AUDIT LSM_HOOK_INIT(audit_rule_init, smack_audit_rule_init), |