NFS: move credential expiry tracking out of SUNRPC into NFS.
NFS needs to know when a credential is about to expire so that
it can modify write-back behaviour to finish the write inside the
expiry time.
It currently uses functions in SUNRPC code which make use of a
fairly complex callback scheme and flags in the generic credientials.
As I am working to discard the generic credentials, this has to change.
This patch moves the logic into NFS, in part by finding and caching
the low-level credential in the open_context. We then make direct
cred-api calls on that.
This makes the code much simpler and removes a dependency on generic
rpc credentials.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 27d9057..cf23eed 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -360,29 +360,6 @@ rpcauth_init_credcache(struct rpc_auth *auth)
}
EXPORT_SYMBOL_GPL(rpcauth_init_credcache);
-/*
- * Setup a credential key lifetime timeout notification
- */
-int
-rpcauth_key_timeout_notify(struct rpc_auth *auth, struct rpc_cred *cred)
-{
- if (!cred->cr_auth->au_ops->key_timeout)
- return 0;
- return cred->cr_auth->au_ops->key_timeout(auth, cred);
-}
-EXPORT_SYMBOL_GPL(rpcauth_key_timeout_notify);
-
-bool
-rpcauth_cred_key_to_expire(struct rpc_auth *auth, struct rpc_cred *cred)
-{
- if (auth->au_flags & RPCAUTH_AUTH_NO_CRKEY_TIMEOUT)
- return false;
- if (!cred->cr_ops->crkey_to_expire)
- return false;
- return cred->cr_ops->crkey_to_expire(cred);
-}
-EXPORT_SYMBOL_GPL(rpcauth_cred_key_to_expire);
-
char *
rpcauth_stringify_acceptor(struct rpc_cred *cred)
{
diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c
index 5f7aa63..c57e831 100644
--- a/net/sunrpc/auth_generic.c
+++ b/net/sunrpc/auth_generic.c
@@ -87,7 +87,6 @@ generic_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags, g
gcred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
gcred->acred.cred = gcred->gc_base.cr_cred;
- gcred->acred.ac_flags = 0;
gcred->acred.principal = acred->principal;
dprintk("RPC: allocated %s cred %p for uid %d gid %d\n",
@@ -179,72 +178,12 @@ void rpc_destroy_generic_auth(void)
rpcauth_destroy_credcache(&generic_auth);
}
-/*
- * Test the the current time (now) against the underlying credential key expiry
- * minus a timeout and setup notification.
- *
- * The normal case:
- * If 'now' is before the key expiry minus RPC_KEY_EXPIRE_TIMEO, set
- * the RPC_CRED_NOTIFY_TIMEOUT flag to setup the underlying credential
- * rpc_credops crmatch routine to notify this generic cred when it's key
- * expiration is within RPC_KEY_EXPIRE_TIMEO, and return 0.
- *
- * The error case:
- * If the underlying cred lookup fails, return -EACCES.
- *
- * The 'almost' error case:
- * If 'now' is within key expiry minus RPC_KEY_EXPIRE_TIMEO, but not within
- * key expiry minus RPC_KEY_EXPIRE_FAIL, set the RPC_CRED_EXPIRE_SOON bit
- * on the acred ac_flags and return 0.
- */
-static int
-generic_key_timeout(struct rpc_auth *auth, struct rpc_cred *cred)
-{
- struct auth_cred *acred = &container_of(cred, struct generic_cred,
- gc_base)->acred;
- struct rpc_cred *tcred;
- int ret = 0;
-
-
- /* Fast track for non crkey_timeout (no key) underlying credentials */
- if (auth->au_flags & RPCAUTH_AUTH_NO_CRKEY_TIMEOUT)
- return 0;
-
- /* Fast track for the normal case */
- if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags))
- return 0;
-
- /* lookup_cred either returns a valid referenced rpc_cred, or PTR_ERR */
- tcred = auth->au_ops->lookup_cred(auth, acred, 0);
- if (IS_ERR(tcred))
- return -EACCES;
-
- /* Test for the almost error case */
- ret = tcred->cr_ops->crkey_timeout(tcred);
- if (ret != 0) {
- set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
- ret = 0;
- } else {
- /* In case underlying cred key has been reset */
- if (test_and_clear_bit(RPC_CRED_KEY_EXPIRE_SOON,
- &acred->ac_flags))
- dprintk("RPC: UID %d Credential key reset\n",
- from_kuid(&init_user_ns, tcred->cr_uid));
- /* set up fasttrack for the normal case */
- set_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags);
- }
-
- put_rpccred(tcred);
- return ret;
-}
-
static const struct rpc_authops generic_auth_ops = {
.owner = THIS_MODULE,
.au_name = "Generic",
.hash_cred = generic_hash_cred,
.lookup_cred = generic_lookup_cred,
.crcreate = generic_create_cred,
- .key_timeout = generic_key_timeout,
};
static struct rpc_auth generic_auth = {
@@ -252,17 +191,9 @@ static struct rpc_auth generic_auth = {
.au_count = REFCOUNT_INIT(1),
};
-static bool generic_key_to_expire(struct rpc_cred *cred)
-{
- struct auth_cred *acred = &container_of(cred, struct generic_cred,
- gc_base)->acred;
- return test_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
-}
-
static const struct rpc_credops generic_credops = {
.cr_name = "Generic cred",
.crdestroy = generic_destroy_cred,
.crbind = generic_bind_cred,
.crmatch = generic_match,
- .crkey_to_expire = generic_key_to_expire,
};
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index b218e15..03a1cd5 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -1517,23 +1517,10 @@ gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
if (gss_cred->gc_principal == NULL)
return 0;
ret = strcmp(acred->principal, gss_cred->gc_principal) == 0;
- goto check_expire;
- }
- if (gss_cred->gc_principal != NULL)
- return 0;
- ret = uid_eq(rc->cr_uid, acred->cred->fsuid);
-
-check_expire:
- if (ret == 0)
- return ret;
-
- /* Notify acred users of GSS context expiration timeout */
- if (test_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags) &&
- (gss_key_timeout(rc) != 0)) {
- /* test will now be done from generic cred */
- test_and_clear_bit(RPC_CRED_NOTIFY_TIMEOUT, &acred->ac_flags);
- /* tell NFS layer that key will expire soon */
- set_bit(RPC_CRED_KEY_EXPIRE_SOON, &acred->ac_flags);
+ } else {
+ if (gss_cred->gc_principal != NULL)
+ return 0;
+ ret = uid_eq(rc->cr_uid, acred->cred->fsuid);
}
return ret;
}
