From ddf529eeed59184c49dcad1633c11831f822bf6b Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 3 Dec 2018 11:30:30 +1100 Subject: 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 Signed-off-by: Anna Schumaker --- net/sunrpc/auth.c | 23 -------------- net/sunrpc/auth_generic.c | 69 ------------------------------------------ net/sunrpc/auth_gss/auth_gss.c | 21 +++---------- 3 files changed, 4 insertions(+), 109 deletions(-) (limited to 'net') diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c index 27d90578e7a0..cf23eed01b1c 100644 --- a/net/sunrpc/auth.c +++ b/net/sunrpc/auth.c @@ -360,29 +360,6 @@ out_nocache: } 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 5f7aa6324b78..c57e83184d3c 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 b218e15b61cb..03a1cd5bfb43 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -1517,23 +1517,10 @@ out: 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; } -- cgit v1.2.3