diff options
Diffstat (limited to 'security/keys/keyctl.c')
| -rw-r--r-- | security/keys/keyctl.c | 355 |
1 files changed, 205 insertions, 150 deletions
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index 60924f6..31a0fd8 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -1,4 +1,4 @@ -/* keyctl.c: userspace keyctl operations +/* Userspace key control operations * * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) @@ -31,28 +31,24 @@ static int key_get_type_from_user(char *type, int ret; ret = strncpy_from_user(type, _type, len); - if (ret < 0) return ret; - if (ret == 0 || ret >= len) return -EINVAL; - if (type[0] == '.') return -EPERM; - type[len - 1] = '\0'; - return 0; } -/*****************************************************************************/ /* - * extract the description of a new key from userspace and either add it as a - * new key to the specified keyring or update a matching key in that keyring - * - the keyring must be writable - * - returns the new key's serial number - * - implements add_key() + * Extract the description of a new key from userspace and either add it as a + * new key to the specified keyring or update a matching key in that keyring. + * + * The keyring must be writable so that we can attach the key to it. + * + * If successful, the new key's serial number is returned, otherwise an error + * code is returned. */ SYSCALL_DEFINE5(add_key, const char __user *, _type, const char __user *, _description, @@ -132,19 +128,20 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type, kfree(description); error: return ret; +} -} /* end sys_add_key() */ - -/*****************************************************************************/ /* - * search the process keyrings for a matching key - * - nested keyrings may also be searched if they have Search permission - * - if a key is found, it will be attached to the destination keyring if - * there's one specified - * - /sbin/request-key will be invoked if _callout_info is non-NULL - * - the _callout_info string will be passed to /sbin/request-key - * - if the _callout_info string is empty, it will be rendered as "-" - * - implements request_key() + * Search the process keyrings and keyring trees linked from those for a + * matching key. Keyrings must have appropriate Search permission to be + * searched. + * + * If a key is found, it will be attached to the destination keyring if there's + * one specified and the serial number of the key will be returned. + * + * If no key is found, /sbin/request-key will be invoked if _callout_info is + * non-NULL in an attempt to create a key. The _callout_info string will be + * passed to /sbin/request-key to aid with completing the request. If the + * _callout_info string is "" then it will be changed to "-". */ SYSCALL_DEFINE4(request_key, const char __user *, _type, const char __user *, _description, @@ -222,14 +219,14 @@ error2: kfree(description); error: return ret; +} -} /* end sys_request_key() */ - -/*****************************************************************************/ /* - * get the ID of the specified process keyring - * - the keyring must have search permission to be found - * - implements keyctl(KEYCTL_GET_KEYRING_ID) + * Get the ID of the specified process keyring. + * + * The requested keyring must have search permission to be found. + * + * If successful, the ID of the requested keyring will be returned. */ long keyctl_get_keyring_ID(key_serial_t id, int create) { @@ -248,13 +245,17 @@ long keyctl_get_keyring_ID(key_serial_t id, int create) key_ref_put(key_ref); error: return ret; +} -} /* end keyctl_get_keyring_ID() */ - -/*****************************************************************************/ /* - * join the session keyring - * - implements keyctl(KEYCTL_JOIN_SESSION_KEYRING) + * Join a (named) session keyring. + * + * Create and join an anonymous session keyring or join a named session + * keyring, creating it if necessary. A named session keyring must have Search + * permission for it to be joined. Session keyrings without this permit will + * be skipped over. + * + * If successful, the ID of the joined session keyring will be returned. */ long keyctl_join_session_keyring(const char __user *_name) { @@ -277,14 +278,17 @@ long keyctl_join_session_keyring(const char __user *_name) error: return ret; +} -} /* end keyctl_join_session_keyring() */ - -/*****************************************************************************/ /* - * update a key's data payload - * - the key must be writable - * - implements keyctl(KEYCTL_UPDATE) + * Update a key's data payload from the given data. + * + * The key must grant the caller Write permission and the key type must support + * updating for this to work. A negative key can be positively instantiated + * with this call. + * + * If successful, 0 will be returned. If the key type does not support + * updating, then -EOPNOTSUPP will be returned. */ long keyctl_update_key(key_serial_t id, const void __user *_payload, @@ -326,14 +330,17 @@ error2: kfree(payload); error: return ret; +} -} /* end keyctl_update_key() */ - -/*****************************************************************************/ /* - * revoke a key - * - the key must be writable - * - implements keyctl(KEYCTL_REVOKE) + * Revoke a key. + * + * The key must be grant the caller Write or Setattr permission for this to + * work. The key type should give up its quota claim when revoked. The key + * and any links to the key will be automatically garbage collected after a + * certain amount of time (/proc/sys/kernel/keys/gc_delay). + * + * If successful, 0 is returned. */ long keyctl_revoke_key(key_serial_t id) { @@ -358,14 +365,14 @@ long keyctl_revoke_key(key_serial_t id) key_ref_put(key_ref); error: return ret; +} -} /* end keyctl_revoke_key() */ - -/*****************************************************************************/ /* - * clear the specified process keyring - * - the keyring must be writable - * - implements keyctl(KEYCTL_CLEAR) + * Clear the specified keyring, creating an empty process keyring if one of the + * special keyring IDs is used. + * + * The keyring must grant the caller Write permission for this to work. If + * successful, 0 will be returned. */ long keyctl_keyring_clear(key_serial_t ringid) { @@ -383,15 +390,18 @@ long keyctl_keyring_clear(key_serial_t ringid) key_ref_put(keyring_ref); error: return ret; +} -} /* end keyctl_keyring_clear() */ - -/*****************************************************************************/ /* - * link a key into a keyring - * - the keyring must be writable - * - the key must be linkable - * - implements keyctl(KEYCTL_LINK) + * Create a link from a keyring to a key if there's no matching key in the + * keyring, otherwise replace the link to the matching key with a link to the + * new key. + * + * The key must grant the caller Link permission and the the keyring must grant + * the caller Write permission. Furthermore, if an additional link is created, + * the keyring's quota will be extended. + * + * If successful, 0 will be returned. */ long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) { @@ -417,15 +427,16 @@ error2: key_ref_put(keyring_ref); error: return ret; +} -} /* end keyctl_keyring_link() */ - -/*****************************************************************************/ /* - * unlink the first attachment of a key from a keyring - * - the keyring must be writable - * - we don't need any permissions on the key - * - implements keyctl(KEYCTL_UNLINK) + * Unlink a key from a keyring. + * + * The keyring must grant the caller Write permission for this to work; the key + * itself need not grant the caller anything. If the last link to a key is + * removed then that key will be scheduled for destruction. + * + * If successful, 0 will be returned. */ long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) { @@ -451,19 +462,20 @@ error2: key_ref_put(keyring_ref); error: return ret; +} -} /* end keyctl_keyring_unlink() */ - -/*****************************************************************************/ /* - * describe a user key - * - the key must have view permission - * - if there's a buffer, we place up to buflen bytes of data into it - * - unless there's an error, we return the amount of description available, - * irrespective of how much we may have copied - * - the description is formatted thus: + * Return a description of a key to userspace. + * + * The key must grant the caller View permission for this to work. + * + * If there's a buffer, we place up to buflen bytes of data into it formatted + * in the following way: + * * type;uid;gid;perm;description<NUL> - * - implements keyctl(KEYCTL_DESCRIBE) + * + * If successful, we return the amount of description available, irrespective + * of how much we may have copied into the buffer. */ long keyctl_describe_key(key_serial_t keyid, char __user *buffer, @@ -531,18 +543,17 @@ error2: key_ref_put(key_ref); error: return ret; +} -} /* end keyctl_describe_key() */ - -/*****************************************************************************/ /* - * search the specified keyring for a matching key - * - the start keyring must be searchable - * - nested keyrings may also be searched if they are searchable - * - only keys with search permission may be found - * - if a key is found, it will be attached to the destination keyring if - * there's one specified - * - implements keyctl(KEYCTL_SEARCH) + * Search the specified keyring and any keyrings it links to for a matching + * key. Only keyrings that grant the caller Search permission will be searched + * (this includes the starting keyring). Only keys with Search permission can + * be found. + * + * If successful, the found key will be linked to the destination keyring if + * supplied and the key has Link permission, and the found key ID will be + * returned. */ long keyctl_keyring_search(key_serial_t ringid, const char __user *_type, @@ -626,18 +637,17 @@ error2: kfree(description); error: return ret; +} -} /* end keyctl_keyring_search() */ - -/*****************************************************************************/ /* - * read a user key's payload - * - the keyring must be readable or the key must be searchable from the - * process's keyrings - * - if there's a buffer, we place up to buflen bytes of data into it - * - unless there's an error, we return the amount of data in the key, - * irrespective of how much we may have copied - * - implements keyctl(KEYCTL_READ) + * Read a key's payload. + * + * The key must either grant the caller Read permission, or it must grant the + * caller Search permission when searched for from the process keyrings. + * + * If successful, we place up to buflen bytes of data into the buffer, if one + * is provided, and return the amount of data that is available in the key, + * irrespective of how much we copied into the buffer. */ long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) { @@ -688,15 +698,22 @@ error2: key_put(key); error: return ret; +} -} /* end keyctl_read_key() */ - -/*****************************************************************************/ /* - * change the ownership of a key - * - the keyring owned by the changer - * - if the uid or gid is -1, then that parameter is not changed - * - implements keyctl(KEYCTL_CHOWN) + * Change the ownership of a key + * + * The key must grant the caller Setattr permission for this to work, though + * the key need not be fully instantiated yet. For the UID to be changed, or + * for the GID to be changed to a group the caller is not a member of, the + * caller must have sysadmin capability. If either uid or gid is -1 then that + * attribute is not changed. + * + * If the UID is to be changed, the new user must have sufficient quota to + * accept the key. The quota deduction will be removed from the old user to + * the new user should the attribute be changed. + * + * If successful, 0 will be returned. */ long keyctl_chown_key(key_serial_t id, uid_t uid, gid_t gid) { @@ -796,14 +813,14 @@ quota_overrun: zapowner = newowner; ret = -EDQUOT; goto error_put; +} -} /* end keyctl_chown_key() */ - -/*****************************************************************************/ /* - * change the permission mask on a key - * - the keyring owned by the changer - * - implements keyctl(KEYCTL_SETPERM) + * Change the permission mask on a key. + * + * The key must grant the caller Setattr permission for this to work, though + * the key need not be fully instantiated yet. If the caller does not have + * sysadmin capability, it may only change the permission on keys that it owns. */ long keyctl_setperm_key(key_serial_t id, key_perm_t perm) { @@ -838,11 +855,11 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm) key_put(key); error: return ret; - -} /* end keyctl_setperm_key() */ +} /* - * get the destination keyring for instantiation + * Get the destination keyring for instantiation and check that the caller has + * Write permission on it. */ static long get_instantiation_keyring(key_serial_t ringid, struct request_key_auth *rka, @@ -879,7 +896,7 @@ static long get_instantiation_keyring(key_serial_t ringid, } /* - * change the request_key authorisation key on the current process + * Change the request_key authorisation key on the current process. */ static int keyctl_change_reqkey_auth(struct key *key) { @@ -895,10 +912,14 @@ static int keyctl_change_reqkey_auth(struct key *key) return commit_creds(new); } -/*****************************************************************************/ /* - * instantiate the key with the specified payload, and, if one is given, link - * the key into the keyring + * Instantiate a key with the specified payload and link the key into the + * destination keyring if one is given. + * + * The caller must have the appropriate instantiation permit set for this to + * work (see keyctl_assume_authority). No other permissions are required. + * + * If successful, 0 will be returned. */ long keyctl_instantiate_key(key_serial_t id, const void __user *_payload, @@ -973,13 +994,22 @@ error2: vfree(payload); error: return ret; +} -} /* end keyctl_instantiate_key() */ - -/*****************************************************************************/ /* - * negatively instantiate the key with the given timeout (in seconds), and, if - * one is given, link the key into the keyring + * Negatively instantiate the key with the given timeout (in seconds) and link + * the key into the destination keyring if one is given. + * + * The caller must have the appropriate instantiation permit set for this to + * work (see keyctl_assume_authority). No other permissions are required. + * + * The key and any links to the key will be automatically garbage collected + * after the timeout expires. + * + * Negative keys are used to rate limit repeated request_key() calls by causing + * them to return -ENOKEY until the negative key expires. + * + * If successful, 0 will be returned. */ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) { @@ -1020,13 +1050,14 @@ long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) error: return ret; +} -} /* end keyctl_negate_key() */ - -/*****************************************************************************/ /* - * set the default keyring in which request_key() will cache keys - * - return the old setting + * Read or set the default keyring in which request_key() will cache keys and + * return the old setting. + * + * If a process keyring is specified then this will be created if it doesn't + * yet exist. The old setting will be returned if successful. */ long keyctl_set_reqkey_keyring(int reqkey_defl) { @@ -1079,12 +1110,19 @@ set: error: abort_creds(new); return ret; +} -} /* end keyctl_set_reqkey_keyring() */ - -/*****************************************************************************/ /* - * set or clear the timeout for a key + * Set or clear the timeout on a key. + * + * Either the key must grant the caller Setattr permission or else the caller + * must hold an instantiation authorisation token for the key. + * + * The timeout is either 0 to clear the timeout, or a number of seconds from + * the current time. The key and any links to the key will be automatically + * garbage collected after the timeout expires. + * + * If successful, 0 is returned. */ long keyctl_set_timeout(key_serial_t id, unsigned timeout) { @@ -1136,12 +1174,24 @@ okay: ret = 0; error: return ret; +} -} /* end keyctl_set_timeout() */ - -/*****************************************************************************/ /* - * assume the authority to instantiate the specified key + * Assume (or clear) the authority to instantiate the specified key. + * + * This sets the authoritative token currently in force for key instantiation. + * This must be done for a key to be instantiated. It has the effect of making + * available all the keys from the caller of the request_key() that created a + * key to request_key() calls made by the caller of this function. + * + * The caller must have the instantiation key in their process keyrings with a + * Search permission grant available to the caller. + * + * If the ID given is 0, then the setting will be cleared and 0 returned. + * + * If the ID given has a matching an authorisation key, then that key will be + * set and its ID will be returned. The authorisation key can be read to get + * the callout information passed to request_key(). */ long keyctl_assume_authority(key_serial_t id) { @@ -1178,16 +1228,17 @@ long keyctl_assume_authority(key_serial_t id) ret = authkey->serial; error: return ret; - -} /* end keyctl_assume_authority() */ +} /* - * get the security label of a key - * - the key must grant us view permission - * - if there's a buffer, we place up to buflen bytes of data into it - * - unless there's an error, we return the amount of information available, - * irrespective of how much we may have copied (including the terminal NUL) - * - implements keyctl(KEYCTL_GET_SECURITY) + * Get a key's the LSM security label. + * + * The key must grant the caller View permission for this to work. + * + * If there's a buffer, then up to buflen bytes of data will be placed into it. + * + * If successful, the amount of information available will be returned, + * irrespective of how much was copied (including the terminal NUL). */ long keyctl_get_security(key_serial_t keyid, char __user *buffer, @@ -1242,10 +1293,16 @@ long keyctl_get_security(key_serial_t keyid, } /* - * attempt to install the calling process's session keyring on the process's - * parent process - * - the keyring must exist and must grant us LINK permission - * - implements keyctl(KEYCTL_SESSION_TO_PARENT) + * Attempt to install the calling process's session keyring on the process's + * parent process. + * + * The keyring must exist and must grant the caller LINK permission, and the + * parent process must be single-threaded and must have the same effective + * ownership as this process and mustn't be SUID/SGID. + * + * The keyring will be emplaced on the parent when it next resumes userspace. + * + * If successful, 0 will be returned. */ long keyctl_session_to_parent(void) { @@ -1348,9 +1405,8 @@ error_keyring: #endif /* !TIF_NOTIFY_RESUME */ } -/*****************************************************************************/ /* - * the key control system call + * The key control system call */ SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, unsigned long, arg4, unsigned long, arg5) @@ -1439,5 +1495,4 @@ SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, default: return -EOPNOTSUPP; } - -} /* end sys_keyctl() */ +} |