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nfs4: copy acceptor name from context to nfs_client
The current CB_COMPOUND handling code tries to compare the principal name of the request with the cl_hostname in the client. This is not guaranteed to ever work, particularly if the client happened to mount a CNAME of the server or a non-fqdn. Fix this by instead comparing the cr_principal string with the acceptor name that we get from gssd. In the event that gssd didn't send one down (i.e. it was too old), then we fall back to trying to use the cl_hostname as we do today. Signed-off-by: Jeff Layton <jlayton@poochiereds.net> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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@ -428,6 +428,18 @@ check_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp)
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if (p == NULL)
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return 0;
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/*
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* Did we get the acceptor from userland during the SETCLIENID
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* negotiation?
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*/
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if (clp->cl_acceptor)
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return !strcmp(p, clp->cl_acceptor);
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/*
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* Otherwise try to verify it using the cl_hostname. Note that this
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* doesn't work if a non-canonical hostname was used in the devname.
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*/
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/* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */
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if (memcmp(p, "nfs@", 4) != 0)
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@ -252,6 +252,7 @@ void nfs_free_client(struct nfs_client *clp)
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put_net(clp->cl_net);
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put_nfs_version(clp->cl_nfs_mod);
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kfree(clp->cl_hostname);
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kfree(clp->cl_acceptor);
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kfree(clp);
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dprintk("<-- nfs_free_client()\n");
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@ -4936,6 +4936,18 @@ nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
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return scnprintf(buf, len, "tcp");
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}
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static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
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{
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struct nfs4_setclientid *sc = calldata;
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if (task->tk_status == 0)
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sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
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}
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static const struct rpc_call_ops nfs4_setclientid_ops = {
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.rpc_call_done = nfs4_setclientid_done,
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};
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/**
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* nfs4_proc_setclientid - Negotiate client ID
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* @clp: state data structure
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@ -4962,6 +4974,14 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
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.rpc_resp = res,
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.rpc_cred = cred,
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};
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struct rpc_task *task;
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struct rpc_task_setup task_setup_data = {
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.rpc_client = clp->cl_rpcclient,
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.rpc_message = &msg,
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.callback_ops = &nfs4_setclientid_ops,
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.callback_data = &setclientid,
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.flags = RPC_TASK_TIMEOUT,
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};
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int status;
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/* nfs_client_id4 */
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@ -4988,7 +5008,18 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
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dprintk("NFS call setclientid auth=%s, '%.*s'\n",
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clp->cl_rpcclient->cl_auth->au_ops->au_name,
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setclientid.sc_name_len, setclientid.sc_name);
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status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
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task = rpc_run_task(&task_setup_data);
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if (IS_ERR(task)) {
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status = PTR_ERR(task);
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goto out;
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}
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status = task->tk_status;
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if (setclientid.sc_cred) {
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clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
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put_rpccred(setclientid.sc_cred);
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}
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rpc_put_task(task);
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out:
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trace_nfs4_setclientid(clp, status);
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dprintk("NFS reply setclientid: %d\n", status);
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return status;
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@ -45,6 +45,7 @@ struct nfs_client {
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struct sockaddr_storage cl_addr; /* server identifier */
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size_t cl_addrlen;
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char * cl_hostname; /* hostname of server */
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char * cl_acceptor; /* GSSAPI acceptor name */
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struct list_head cl_share_link; /* link in global client list */
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struct list_head cl_superblocks; /* List of nfs_server structs */
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@ -993,6 +993,7 @@ struct nfs4_setclientid {
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unsigned int sc_uaddr_len;
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char sc_uaddr[RPCBIND_MAXUADDRLEN + 1];
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u32 sc_cb_ident;
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struct rpc_cred *sc_cred;
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};
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struct nfs4_setclientid_res {
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