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authorTrond Myklebust <Trond.Myklebust@netapp.com>2007-06-26 17:04:57 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2007-07-10 23:40:37 -0400
commit0df7fb74fbb709591301871a38aac7735a1d6583 (patch)
treea5fc18f5aa581a7e8591551f17e86902b5a7e6b3
parent0285ed1f12298e5304f0f2642e2cf31a5f302e61 (diff)
downloadop-kernel-dev-0df7fb74fbb709591301871a38aac7735a1d6583.zip
op-kernel-dev-0df7fb74fbb709591301871a38aac7735a1d6583.tar.gz
SUNRPC: Ensure RPCSEC_GSS destroys the security context when freeing a cred
Do so by set the gc_proc field to RPC_GSS_PROC_DESTROY, and then sending a NULL RPC call. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--net/sunrpc/auth_gss/auth_gss.c60
1 files changed, 58 insertions, 2 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 982aba6..17d460f 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -57,6 +57,7 @@
static const struct rpc_authops authgss_ops;
static const struct rpc_credops gss_credops;
+static const struct rpc_credops gss_nullops;
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
@@ -695,7 +696,39 @@ gss_destroy(struct rpc_auth *auth)
kref_put(&gss_auth->kref, gss_free_callback);
}
-/* gss_destroy_cred (and gss_destroy_ctx) are used to clean up after failure
+/*
+ * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call
+ * to the server with the GSS control procedure field set to
+ * RPC_GSS_PROC_DESTROY. This should normally cause the server to release
+ * all RPCSEC_GSS state associated with that context.
+ */
+static int
+gss_destroying_context(struct rpc_cred *cred)
+{
+ struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+ struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
+ struct rpc_task *task;
+
+ if (gss_cred->gc_ctx == NULL ||
+ gss_cred->gc_ctx->gc_proc == RPC_GSS_PROC_DESTROY)
+ return 0;
+
+ gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY;
+ cred->cr_ops = &gss_nullops;
+
+ /* Take a reference to ensure the cred will be destroyed either
+ * by the RPC call or by the put_rpccred() below */
+ get_rpccred(cred);
+
+ task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC);
+ if (!IS_ERR(task))
+ rpc_put_task(task);
+
+ put_rpccred(cred);
+ return 1;
+}
+
+/* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure
* to create a new cred or context, so they check that things have been
* allocated before freeing them. */
static void
@@ -744,6 +777,8 @@ gss_destroy_cred(struct rpc_cred *cred)
struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth);
struct gss_cl_ctx *ctx = gss_cred->gc_ctx;
+ if (gss_destroying_context(cred))
+ return;
rcu_assign_pointer(gss_cred->gc_ctx, NULL);
call_rcu(&cred->cr_rcu, gss_free_cred_callback);
if (ctx)
@@ -892,6 +927,13 @@ gss_refresh(struct rpc_task *task)
return 0;
}
+/* Dummy refresh routine: used only when destroying the context */
+static int
+gss_refresh_null(struct rpc_task *task)
+{
+ return -EACCES;
+}
+
static __be32 *
gss_validate(struct rpc_task *task, __be32 *p)
{
@@ -921,8 +963,11 @@ gss_validate(struct rpc_task *task, __be32 *p)
maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
- if (maj_stat)
+ if (maj_stat) {
+ dprintk("RPC: %5u gss_validate: gss_verify_mic returned"
+ "error 0x%08x\n", task->tk_pid, maj_stat);
goto out_bad;
+ }
/* We leave it to unwrap to calculate au_rslack. For now we just
* calculate the length of the verifier: */
cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2;
@@ -1260,6 +1305,17 @@ static const struct rpc_credops gss_credops = {
.crunwrap_resp = gss_unwrap_resp,
};
+static const struct rpc_credops gss_nullops = {
+ .cr_name = "AUTH_GSS",
+ .crdestroy = gss_destroy_cred,
+ .crmatch = gss_match,
+ .crmarshal = gss_marshal,
+ .crrefresh = gss_refresh_null,
+ .crvalidate = gss_validate,
+ .crwrap_req = gss_wrap_req,
+ .crunwrap_resp = gss_unwrap_resp,
+};
+
static struct rpc_pipe_ops gss_upcall_ops = {
.upcall = gss_pipe_upcall,
.downcall = gss_pipe_downcall,
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