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authorAndy Adamson <andros@netapp.com>2013-08-14 11:59:15 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-09-03 15:25:08 -0400
commit4de6caa270afaa381dd3373e9e6d148b1090e0ec (patch)
tree2b212167c872f2038ed3480df872766bbd7b67e3 /include/linux/sunrpc
parentf1ff0c27fd9987c59d707cd1a6b6c1fc3ae0a250 (diff)
SUNRPC new rpc_credops to test credential expiry
This patch provides the RPC layer helper functions to allow NFS to manage data in the face of expired credentials - such as avoiding buffered WRITEs and COMMITs when the gss context will expire before the WRITEs are flushed and COMMITs are sent. These helper functions enable checking the expiration of an underlying credential key for a generic rpc credential, e.g. the gss_cred gss context gc_expiry which for Kerberos is set to the remaining TGT lifetime. A new rpc_authops key_timeout is only defined for the generic auth. A new rpc_credops crkey_to_expire is only defined for the generic cred. A new rpc_credops crkey_timeout is only defined for the gss cred. Set a credential key expiry watermark, RPC_KEY_EXPIRE_TIMEO set to 240 seconds as a default and can be set via a module parameter as we need to ensure there is time for any dirty data to be flushed. If key_timeout is called on a credential with an underlying credential key that will expire within watermark seconds, we set the RPC_CRED_KEY_EXPIRE_SOON flag in the generic_cred acred so that the NFS layer can clean up prior to key expiration. Checking a generic credential's underlying credential involves a cred lookup. To avoid this lookup in the normal case when the underlying credential has a key that is valid (before the watermark), a notify flag is set in the generic credential the first time the key_timeout is called. The generic credential then stops checking the underlying credential key expiry, and the underlying credential (gss_cred) match routine then checks the key expiration upon each normal use and sets a flag in the associated generic credential only when the key expiration is within the watermark. This in turn signals the generic credential key_timeout to perform the extra credential lookup thereafter. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'include/linux/sunrpc')
-rw-r--r--include/linux/sunrpc/auth.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
index 6de26f2491e5..790be1472792 100644
--- a/include/linux/sunrpc/auth.h
+++ b/include/linux/sunrpc/auth.h
@@ -24,12 +24,21 @@
struct rpcsec_gss_info;
+/* auth_cred ac_flags bits */
+enum {
+ RPC_CRED_NO_CRKEY_TIMEOUT = 0, /* underlying cred has no key timeout */
+ RPC_CRED_KEY_EXPIRE_SOON = 1, /* underlying cred key will expire soon */
+ RPC_CRED_NOTIFY_TIMEOUT = 2, /* nofity generic cred when underlying
+ key will expire soon */
+};
+
/* Work around the lack of a VFS credential */
struct auth_cred {
kuid_t uid;
kgid_t gid;
struct group_info *group_info;
const char *principal;
+ unsigned long ac_flags;
unsigned char machine_cred : 1;
};
@@ -111,6 +120,8 @@ struct rpc_authops {
rpc_authflavor_t (*info2flavor)(struct rpcsec_gss_info *);
int (*flavor2info)(rpc_authflavor_t,
struct rpcsec_gss_info *);
+ int (*key_timeout)(struct rpc_auth *,
+ struct rpc_cred *);
};
struct rpc_credops {
@@ -127,6 +138,8 @@ struct rpc_credops {
void *, __be32 *, void *);
int (*crunwrap_resp)(struct rpc_task *, kxdrdproc_t,
void *, __be32 *, void *);
+ int (*crkey_timeout)(struct rpc_cred *);
+ bool (*crkey_to_expire)(struct rpc_cred *);
};
extern const struct rpc_authops authunix_ops;
@@ -166,6 +179,9 @@ int rpcauth_uptodatecred(struct rpc_task *);
int rpcauth_init_credcache(struct rpc_auth *);
void rpcauth_destroy_credcache(struct rpc_auth *);
void rpcauth_clear_credcache(struct rpc_cred_cache *);
+int rpcauth_key_timeout_notify(struct rpc_auth *,
+ struct rpc_cred *);
+bool rpcauth_cred_key_to_expire(struct rpc_cred *);
static inline
struct rpc_cred * get_rpccred(struct rpc_cred *cred)