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authorAndy Adamson <andros@netapp.com>2011-01-25 18:38:01 +0300
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-01-25 23:26:51 +0300
commit778be232a207e79088ba70d832ac25dfea6fbf1a (patch)
tree307249459e5ef45c4b3651c7fc5c454cdb3e0c92 /fs/nfs/callback.c
parent80c30e8de4f81851b1f712bcc596e11d53bc76f1 (diff)
downloadlinux-778be232a207e79088ba70d832ac25dfea6fbf1a.tar.xz
NFS do not find client in NFSv4 pg_authenticate
The information required to find the nfs_client cooresponding to the incoming back channel request is contained in the NFS layer. Perform minimal checking in the RPC layer pg_authenticate method, and push more detailed checking into the NFS layer where the nfs_client can be found. Signed-off-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/callback.c')
-rw-r--r--fs/nfs/callback.c109
1 files changed, 29 insertions, 80 deletions
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 199016528fcb..e3d294269058 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -135,33 +135,6 @@ out_err:
#if defined(CONFIG_NFS_V4_1)
/*
- * * CB_SEQUENCE operations will fail until the callback sessionid is set.
- * */
-int nfs4_set_callback_sessionid(struct nfs_client *clp)
-{
- struct svc_serv *serv = clp->cl_rpcclient->cl_xprt->bc_serv;
- struct nfs4_sessionid *bc_sid;
-
- if (!serv->sv_bc_xprt)
- return -EINVAL;
-
- /* on success freed in xprt_free */
- bc_sid = kmalloc(sizeof(struct nfs4_sessionid), GFP_KERNEL);
- if (!bc_sid)
- return -ENOMEM;
- memcpy(bc_sid->data, &clp->cl_session->sess_id.data,
- NFS4_MAX_SESSIONID_LEN);
- spin_lock_bh(&serv->sv_cb_lock);
- serv->sv_bc_xprt->xpt_bc_sid = bc_sid;
- spin_unlock_bh(&serv->sv_cb_lock);
- dprintk("%s set xpt_bc_sid=%u:%u:%u:%u for sv_bc_xprt %p\n", __func__,
- ((u32 *)bc_sid->data)[0], ((u32 *)bc_sid->data)[1],
- ((u32 *)bc_sid->data)[2], ((u32 *)bc_sid->data)[3],
- serv->sv_bc_xprt);
- return 0;
-}
-
-/*
* The callback service for NFSv4.1 callbacks
*/
static int
@@ -266,10 +239,6 @@ static inline void nfs_callback_bc_serv(u32 minorversion, struct rpc_xprt *xprt,
struct nfs_callback_data *cb_info)
{
}
-int nfs4_set_callback_sessionid(struct nfs_client *clp)
-{
- return 0;
-}
#endif /* CONFIG_NFS_V4_1 */
/*
@@ -359,78 +328,58 @@ void nfs_callback_down(int minorversion)
mutex_unlock(&nfs_callback_mutex);
}
-static int check_gss_callback_principal(struct nfs_client *clp,
- struct svc_rqst *rqstp)
+/* Boolean check of RPC_AUTH_GSS principal */
+int
+check_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp)
{
struct rpc_clnt *r = clp->cl_rpcclient;
char *p = svc_gss_principal(rqstp);
+ if (rqstp->rq_authop->flavour != RPC_AUTH_GSS)
+ return 1;
+
/* No RPC_AUTH_GSS on NFSv4.1 back channel yet */
if (clp->cl_minorversion != 0)
- return SVC_DROP;
+ return 0;
/*
* It might just be a normal user principal, in which case
* userspace won't bother to tell us the name at all.
*/
if (p == NULL)
- return SVC_DENIED;
+ return 0;
/* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */
if (memcmp(p, "nfs@", 4) != 0)
- return SVC_DENIED;
+ return 0;
p += 4;
if (strcmp(p, r->cl_server) != 0)
- return SVC_DENIED;
- return SVC_OK;
+ return 0;
+ return 1;
}
-/* pg_authenticate method helper */
-static struct nfs_client *nfs_cb_find_client(struct svc_rqst *rqstp)
-{
- struct nfs4_sessionid *sessionid = bc_xprt_sid(rqstp);
- int is_cb_compound = rqstp->rq_proc == CB_COMPOUND ? 1 : 0;
-
- dprintk("--> %s rq_proc %d\n", __func__, rqstp->rq_proc);
- if (svc_is_backchannel(rqstp))
- /* Sessionid (usually) set after CB_NULL ping */
- return nfs4_find_client_sessionid(svc_addr(rqstp), sessionid,
- is_cb_compound);
- else
- /* No callback identifier in pg_authenticate */
- return nfs4_find_client_no_ident(svc_addr(rqstp));
-}
-
-/* pg_authenticate method for nfsv4 callback threads. */
+/*
+ * pg_authenticate method for nfsv4 callback threads.
+ *
+ * The authflavor has been negotiated, so an incorrect flavor is a server
+ * bug. Drop packets with incorrect authflavor.
+ *
+ * All other checking done after NFS decoding where the nfs_client can be
+ * found in nfs4_callback_compound
+ */
static int nfs_callback_authenticate(struct svc_rqst *rqstp)
{
- struct nfs_client *clp;
- RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
- int ret = SVC_OK;
-
- /* Don't talk to strangers */
- clp = nfs_cb_find_client(rqstp);
- if (clp == NULL)
- return SVC_DROP;
-
- dprintk("%s: %s NFSv4 callback!\n", __func__,
- svc_print_addr(rqstp, buf, sizeof(buf)));
-
switch (rqstp->rq_authop->flavour) {
- case RPC_AUTH_NULL:
- if (rqstp->rq_proc != CB_NULL)
- ret = SVC_DENIED;
- break;
- case RPC_AUTH_UNIX:
- break;
- case RPC_AUTH_GSS:
- ret = check_gss_callback_principal(clp, rqstp);
- break;
- default:
- ret = SVC_DENIED;
+ case RPC_AUTH_NULL:
+ if (rqstp->rq_proc != CB_NULL)
+ return SVC_DROP;
+ break;
+ case RPC_AUTH_GSS:
+ /* No RPC_AUTH_GSS support yet in NFSv4.1 */
+ if (svc_is_backchannel(rqstp))
+ return SVC_DROP;
}
- nfs_put_client(clp);
- return ret;
+ return SVC_OK;
}
/*