From 700920eb5ba4de5417b446c9a8bb008df2b973e0 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 18 Jan 2012 15:31:45 +0000 Subject: [PATCH] KEYS: Allow special keyrings to be cleared The kernel contains some special internal keyrings, for instance the DNS resolver keyring : 2a93faf1 I----- 1 perm 1f030000 0 0 keyring .dns_resolver: empty It would occasionally be useful to allow the contents of such keyrings to be flushed by root (cache invalidation). Allow a flag to be set on a keyring to mark that someone possessing the sysadmin capability can clear the keyring, even without normal write access to the keyring. Set this flag on the special keyrings created by the DNS resolver, the NFS identity mapper and the CIFS identity mapper. Signed-off-by: David Howells Acked-by: Jeff Layton Acked-by: Steve Dickson Signed-off-by: James Morris --- Documentation/networking/dns_resolver.txt | 4 ++++ Documentation/security/keys.txt | 4 ++++ fs/cifs/cifsacl.c | 1 + fs/nfs/idmap.c | 1 + include/linux/key.h | 1 + net/dns_resolver/dns_key.c | 1 + security/keys/keyctl.c | 15 ++++++++++++++- 7 files changed, 26 insertions(+), 1 deletion(-) diff --git a/Documentation/networking/dns_resolver.txt b/Documentation/networking/dns_resolver.txt index 7f531ad83285..d86adcdae420 100644 --- a/Documentation/networking/dns_resolver.txt +++ b/Documentation/networking/dns_resolver.txt @@ -102,6 +102,10 @@ implemented in the module can be called after doing: If _expiry is non-NULL, the expiry time (TTL) of the result will be returned also. +The kernel maintains an internal keyring in which it caches looked up keys. +This can be cleared by any process that has the CAP_SYS_ADMIN capability by +the use of KEYCTL_KEYRING_CLEAR on the keyring ID. + =============================== READING DNS KEYS FROM USERSPACE diff --git a/Documentation/security/keys.txt b/Documentation/security/keys.txt index 4d75931d2d79..713ec232c562 100644 --- a/Documentation/security/keys.txt +++ b/Documentation/security/keys.txt @@ -554,6 +554,10 @@ The keyctl syscall functions are: process must have write permission on the keyring, and it must be a keyring (or else error ENOTDIR will result). + This function can also be used to clear special kernel keyrings if they + are appropriately marked if the user has CAP_SYS_ADMIN capability. The + DNS resolver cache keyring is an example of this. + (*) Link a key into a keyring: diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c index 72ddf23ef6f7..854749d21bb1 100644 --- a/fs/cifs/cifsacl.c +++ b/fs/cifs/cifsacl.c @@ -556,6 +556,7 @@ init_cifs_idmap(void) /* instruct request_key() to use this special keyring as a cache for * the results it looks up */ + set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); cred->thread_keyring = keyring; cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; root_cred = cred; diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c index 2c05f1991e1e..a1bbf7780dfc 100644 --- a/fs/nfs/idmap.c +++ b/fs/nfs/idmap.c @@ -198,6 +198,7 @@ int nfs_idmap_init(void) if (ret < 0) goto failed_put_key; + set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); cred->thread_keyring = keyring; cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; id_resolver_cache = cred; diff --git a/include/linux/key.h b/include/linux/key.h index 183a6af7715d..3ac412855d83 100644 --- a/include/linux/key.h +++ b/include/linux/key.h @@ -155,6 +155,7 @@ struct key { #define KEY_FLAG_IN_QUOTA 3 /* set if key consumes quota */ #define KEY_FLAG_USER_CONSTRUCT 4 /* set if key is being constructed in userspace */ #define KEY_FLAG_NEGATIVE 5 /* set if key is negative */ +#define KEY_FLAG_ROOT_CAN_CLEAR 6 /* set if key can be cleared by root without permission */ /* the description string * - this is used to match a key against search criteria diff --git a/net/dns_resolver/dns_key.c b/net/dns_resolver/dns_key.c index fa000d26dc60..c73bba326d70 100644 --- a/net/dns_resolver/dns_key.c +++ b/net/dns_resolver/dns_key.c @@ -281,6 +281,7 @@ static int __init init_dns_resolver(void) /* instruct request_key() to use this special keyring as a cache for * the results it looks up */ + set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); cred->thread_keyring = keyring; cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; dns_resolver_cache = cred; diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index 0b3f5d72af1c..6523599e9ac0 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -388,11 +388,24 @@ long keyctl_keyring_clear(key_serial_t ringid) keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); if (IS_ERR(keyring_ref)) { ret = PTR_ERR(keyring_ref); + + /* Root is permitted to invalidate certain special keyrings */ + if (capable(CAP_SYS_ADMIN)) { + keyring_ref = lookup_user_key(ringid, 0, 0); + if (IS_ERR(keyring_ref)) + goto error; + if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, + &key_ref_to_ptr(keyring_ref)->flags)) + goto clear; + goto error_put; + } + goto error; } +clear: ret = keyring_clear(key_ref_to_ptr(keyring_ref)); - +error_put: key_ref_put(keyring_ref); error: return ret; -- 2.20.1