Commit f11b2a1c authored by Jeff Layton's avatar Jeff Layton Committed by Trond Myklebust
Browse files

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: default avatarJeff Layton <jlayton@poochiereds.net>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent a0337d1d

fs/nfs/callback.c

+12 −0
Original line number Diff line number Diff line
@@ -428,6 +428,18 @@ check_gss_callback_principal(struct nfs_client *clp, struct svc_rqst *rqstp) 
	if (p == NULL)

		return 0;



	/*

	 * Did we get the acceptor from userland during the SETCLIENID

	 * negotiation?

	 */

	if (clp->cl_acceptor)

		return !strcmp(p, clp->cl_acceptor);



	/*

	 * Otherwise try to verify it using the cl_hostname. Note that this

	 * doesn't work if a non-canonical hostname was used in the devname.

	 */



	/* Expect a GSS_C_NT_HOSTBASED_NAME like "nfs@serverhostname" */



	if (memcmp(p, "nfs@", 4) != 0)

fs/nfs/client.c

+1 −0
Original line number Diff line number Diff line
@@ -252,6 +252,7 @@ void nfs_free_client(struct nfs_client *clp) 
	put_net(clp->cl_net);

	put_nfs_version(clp->cl_nfs_mod);

	kfree(clp->cl_hostname);

	kfree(clp->cl_acceptor);

	kfree(clp);



	dprintk("<-- nfs_free_client()\n");

fs/nfs/nfs4proc.c

+32 −1
Original line number Diff line number Diff line
@@ -4936,6 +4936,18 @@ nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 
		return scnprintf(buf, len, "tcp");

}



static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)

{

	struct nfs4_setclientid *sc = calldata;



	if (task->tk_status == 0)

		sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);

}



static const struct rpc_call_ops nfs4_setclientid_ops = {

	.rpc_call_done = nfs4_setclientid_done,

};



/**

 * nfs4_proc_setclientid - Negotiate client ID

 * @clp: state data structure
@@ -4962,6 +4974,14 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 
		.rpc_resp = res,

		.rpc_cred = cred,

	};

	struct rpc_task *task;

	struct rpc_task_setup task_setup_data = {

		.rpc_client = clp->cl_rpcclient,

		.rpc_message = &msg,

		.callback_ops = &nfs4_setclientid_ops,

		.callback_data = &setclientid,

		.flags = RPC_TASK_TIMEOUT,

	};

	int status;



	/* nfs_client_id4 */
@@ -4988,7 +5008,18 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 
	dprintk("NFS call  setclientid auth=%s, '%.*s'\n",

		clp->cl_rpcclient->cl_auth->au_ops->au_name,

		setclientid.sc_name_len, setclientid.sc_name);

	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);

	task = rpc_run_task(&task_setup_data);

	if (IS_ERR(task)) {

		status = PTR_ERR(task);

		goto out;

	}

	status = task->tk_status;

	if (setclientid.sc_cred) {

		clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);

		put_rpccred(setclientid.sc_cred);

	}

	rpc_put_task(task);

out:

	trace_nfs4_setclientid(clp, status);

	dprintk("NFS reply setclientid: %d\n", status);

	return status;

include/linux/nfs_fs_sb.h

+1 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ struct nfs_client { 
	struct sockaddr_storage	cl_addr;	/* server identifier */

	size_t			cl_addrlen;

	char *			cl_hostname;	/* hostname of server */

	char *			cl_acceptor;	/* GSSAPI acceptor name */

	struct list_head	cl_share_link;	/* link in global client list */

	struct list_head	cl_superblocks;	/* List of nfs_server structs */

include/linux/nfs_xdr.h

+1 −0
Original line number Diff line number Diff line
@@ -993,6 +993,7 @@ struct nfs4_setclientid { 
	unsigned int			sc_uaddr_len;

	char				sc_uaddr[RPCBIND_MAXUADDRLEN + 1];

	u32				sc_cb_ident;

	struct rpc_cred			*sc_cred;

};



struct nfs4_setclientid_res {

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