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: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2008-04-07 20:50:11 -04:00
parent 78ea323be6
commit 7c67db3a8a
6 changed files with 47 additions and 3 deletions

View File

@ -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);

View File

@ -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;

View File

@ -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 *);

View File

@ -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__ */

View File

@ -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;
}

View File

@ -371,9 +371,16 @@ gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid)
static struct gss_upcall_msg *
gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
{
struct gss_cred *gss_cred = container_of(cred,
struct gss_cred, gc_base);
struct gss_upcall_msg *gss_new, *gss_msg;
uid_t uid = cred->cr_uid;
gss_new = gss_alloc_msg(gss_auth, cred->cr_uid);
/* Special case: rpc.gssd assumes that uid == 0 implies machine creds */
if (gss_cred->gc_machine_cred != 0)
uid = 0;
gss_new = gss_alloc_msg(gss_auth, uid);
if (gss_new == NULL)
return ERR_PTR(-ENOMEM);
gss_msg = gss_add_msg(gss_auth, gss_new);
@ -818,6 +825,7 @@ gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
*/
cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW;
cred->gc_service = gss_auth->service;
cred->gc_machine_cred = acred->machine_cred;
kref_get(&gss_auth->kref);
return &cred->gc_base;
@ -855,6 +863,8 @@ gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags)
if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry))
return 0;
out:
if (acred->machine_cred != gss_cred->gc_machine_cred)
return 0;
return (rc->cr_uid == acred->uid);
}