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authorTrond Myklebust <Trond.Myklebust@netapp.com>2008-04-07 20:50:11 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-04-19 16:54:56 -0400
commit7c67db3a8a98045744f06fcd6d8f476d9df0ba5c (patch)
tree4d0041249b48f9ac66560550e0e96c9c86c37891 /net/sunrpc
parent78ea323be6380a9313e87fe241809e912e8ae401 (diff)
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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>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/auth_generic.c26
-rw-r--r--net/sunrpc/auth_gss/auth_gss.c12
2 files changed, 35 insertions, 3 deletions
diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c
index b6f124c..d927d9f 100644
--- a/net/sunrpc/auth_generic.c
+++ b/net/sunrpc/auth_generic.c
@@ -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;
}
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 7567eb9..46f7ec8 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -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);
}