* [PATCH RFC] SUNRPC: Fail quickly when server does not recognize TLS
@ 2023-09-06 16:00 Chuck Lever
0 siblings, 0 replies; only message in thread
From: Chuck Lever @ 2023-09-06 16:00 UTC (permalink / raw)
To: linux-nfs; +Cc: Trond Myklebust, Chuck Lever
From: Chuck Lever <chuck.lever@oracle.com>
rpcauth_checkverf() should return a distinct error code when the
server does not recognize the AUTH_TLS probe so that the client's
header decoder can respond appropriately.
Suggested-by: Trond Myklebust <trondmy@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
net/sunrpc/auth.c | 11 ++++++++---
net/sunrpc/auth_tls.c | 2 +-
net/sunrpc/clnt.c | 10 +++++++++-
3 files changed, 18 insertions(+), 5 deletions(-)
Compile-tested only, but something like this should be adequate.
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 2f16f9d17966..814b0169f972 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -769,9 +769,14 @@ int rpcauth_wrap_req(struct rpc_task *task, struct xdr_stream *xdr)
* @task: controlling RPC task
* @xdr: xdr_stream containing RPC Reply header
*
- * On success, @xdr is updated to point past the verifier and
- * zero is returned. Otherwise, @xdr is in an undefined state
- * and a negative errno is returned.
+ * Return values:
+ * %0: Verifier is valid. @xdr now points past the verifier.
+ * %-EIO: Verifier is corrupted or message ended early.
+ * %-EACCES: Verifier is intact but not valid.
+ * %-EPROTONOSUPPORT: Server does not support the requested auth type.
+ *
+ * When a negative errno is returned, @xdr is left in an undefined
+ * state.
*/
int
rpcauth_checkverf(struct rpc_task *task, struct xdr_stream *xdr)
diff --git a/net/sunrpc/auth_tls.c b/net/sunrpc/auth_tls.c
index de7678f8a23d..751b3f418f3b 100644
--- a/net/sunrpc/auth_tls.c
+++ b/net/sunrpc/auth_tls.c
@@ -131,7 +131,7 @@ static int tls_validate(struct rpc_task *task, struct xdr_stream *xdr)
if (xdr_stream_decode_opaque_inline(xdr, &str, starttls_len) != starttls_len)
return -EIO;
if (memcmp(str, starttls_token, starttls_len))
- return -EIO;
+ return -EPROTONOSUPPORT;
return 0;
}
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 315bd59dea05..80ee97fb0bf2 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -2722,7 +2722,15 @@ rpc_decode_header(struct rpc_task *task, struct xdr_stream *xdr)
out_verifier:
trace_rpc_bad_verifier(task);
- goto out_garbage;
+ switch (error) {
+ case -EPROTONOSUPPORT:
+ goto out_err;
+ case -EACCES:
+ /* Re-encode with a fresh cred */
+ fallthrough;
+ default:
+ goto out_garbage;
+ }
out_msg_denied:
error = -EACCES;
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