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NFSv4: Reintroduce machine creds

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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
Download Patch File Download Diff File Expand all files Collapse all files
net/sunrpc/auth_generic.c
+24 -2
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;
}