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SUNRPC: Fail quickly when server does not recognize TLS

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rpcauth_checkverf() should return a distinct error code when a
server recognizes the AUTH_TLS probe but does not support TLS so
that the client's header decoder can respond appropriately and
quickly. No retries are necessary is in this case, since the server
has already affirmatively answered "TLS is unsupported".

Suggested-by: Trond Myklebust <trondmy@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2023-09-06 16:05:26 -04:00 committed by Anna Schumaker
parent 6465e260f4
commit 5623ecfcbe
3 changed files with 19 additions and 6 deletions
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11
net/sunrpc/auth.c
View File

@ -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)

4
net/sunrpc/auth_tls.c
View File

@ -129,9 +129,9 @@ static int tls_validate(struct rpc_task *task, struct xdr_stream *xdr)
if (*p != rpc_auth_null)
return -EIO;
if (xdr_stream_decode_opaque_inline(xdr, &str, starttls_len) != starttls_len)
return -EIO;
return -EPROTONOSUPPORT;
if (memcmp(str, starttls_token, starttls_len))
return -EIO;
return -EPROTONOSUPPORT;
return 0;
}

10
net/sunrpc/clnt.c
View File

@ -2725,7 +2725,15 @@ 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;