Commit 7c67db3a authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4: Reintroduce machine creds 



We need to try to ensure that we always use the same credentials whenever
we re-establish the clientid on the server. If not, the server won't
recognise that we're the same client, and so may not allow us to recover
state.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 78ea323b

fs/nfs/client.c

+7 −0
Original line number Diff line number Diff line
@@ -112,6 +112,7 @@ struct nfs_client_initdata { 
static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)

{

	struct nfs_client *clp;

	struct rpc_cred *cred;



	if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)

		goto error_0;
@@ -150,6 +151,9 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_ 
	clp->cl_boot_time = CURRENT_TIME;

	clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;

#endif

	cred = rpc_lookup_machine_cred();

	if (!IS_ERR(cred))

		clp->cl_machine_cred = cred;



	return clp;
@@ -191,6 +195,9 @@ static void nfs_free_client(struct nfs_client *clp) 
	if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))

		nfs_callback_down();



	if (clp->cl_machine_cred != NULL)

		put_rpccred(clp->cl_machine_cred);



	kfree(clp->cl_hostname);

	kfree(clp);

include/linux/nfs_fs_sb.h

+2 −0
Original line number Diff line number Diff line
@@ -32,6 +32,8 @@ struct nfs_client { 
	const struct nfs_rpc_ops *rpc_ops;	/* NFS protocol vector */

	int			cl_proto;	/* Network transport protocol */



	struct rpc_cred		*cl_machine_cred;



#ifdef CONFIG_NFS_V4

	u64			cl_clientid;	/* constant */

	nfs4_verifier		cl_confirm;

include/linux/sunrpc/auth.h

+2 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ struct auth_cred { 
	uid_t	uid;

	gid_t	gid;

	struct group_info *group_info;

	unsigned char machine_cred : 1;

};



/*
@@ -130,6 +131,7 @@ void __exit rpcauth_remove_module(void); 
void __exit		rpc_destroy_generic_auth(void);



struct rpc_cred *	rpc_lookup_cred(void);

struct rpc_cred *	rpc_lookup_machine_cred(void);

int			rpcauth_register(const struct rpc_authops *);

int			rpcauth_unregister(const struct rpc_authops *);

struct rpc_auth *	rpcauth_create(rpc_authflavor_t, struct rpc_clnt *);

include/linux/sunrpc/auth_gss.h

+1 −0
Original line number Diff line number Diff line
@@ -84,6 +84,7 @@ struct gss_cred { 
	enum rpc_gss_svc	gc_service;

	struct gss_cl_ctx	*gc_ctx;

	struct gss_upcall_msg	*gc_upcall;

	unsigned char		gc_machine_cred : 1;

};



#endif /* __KERNEL__ */

net/sunrpc/auth_generic.c

+24 −2
Original line number Diff line number Diff line
@@ -17,6 +17,9 @@ 
# define RPCDBG_FACILITY	RPCDBG_AUTH

#endif



#define RPC_ANONYMOUS_USERID	((uid_t)-2)

#define RPC_ANONYMOUS_GROUPID	((gid_t)-2)



struct generic_cred {

	struct rpc_cred gc_base;

	struct auth_cred acred;
@@ -35,6 +38,22 @@ struct rpc_cred *rpc_lookup_cred(void) 
}

EXPORT_SYMBOL_GPL(rpc_lookup_cred);



/*

 * Public call interface for looking up machine creds.

 */

struct rpc_cred *rpc_lookup_machine_cred(void)

{

	struct auth_cred acred = {

		.uid = RPC_ANONYMOUS_USERID,

		.gid = RPC_ANONYMOUS_GROUPID,

		.machine_cred = 1,

	};



	dprintk("RPC:       looking up machine cred\n");

	return generic_auth.au_ops->lookup_cred(&generic_auth, &acred, 0);

}

EXPORT_SYMBOL_GPL(rpc_lookup_machine_cred);



static void

generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred)

{
@@ -75,8 +94,10 @@ generic_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 
	gcred->acred.group_info = acred->group_info;

	if (gcred->acred.group_info != NULL)

		get_group_info(gcred->acred.group_info);

	gcred->acred.machine_cred = acred->machine_cred;



	dprintk("RPC:       allocated generic cred %p for uid %d gid %d\n",

	dprintk("RPC:       allocated %s cred %p for uid %d gid %d\n",

			gcred->acred.machine_cred ? "machine" : "generic",

			gcred, acred->uid, acred->gid);

	return &gcred->gc_base;

}
@@ -115,7 +136,8 @@ generic_match(struct auth_cred *acred, struct rpc_cred *cred, int flags) 


	if (gcred->acred.uid != acred->uid ||

	    gcred->acred.gid != acred->gid ||

	    gcred->acred.group_info != acred->group_info)

	    gcred->acred.group_info != acred->group_info ||

	    gcred->acred.machine_cred != acred->machine_cred)

		return 0;

	return 1;

}

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