Return-Path: Received: from mail-it0-f67.google.com ([209.85.214.67]:35915 "EHLO mail-it0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751189AbcFTQbh (ORCPT ); Mon, 20 Jun 2016 12:31:37 -0400 Subject: [PATCH v3 24/25] NFS: Don't drop CB requests with invalid principals From: Chuck Lever To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Mon, 20 Jun 2016 12:11:52 -0400 Message-ID: <20160620161152.10809.29988.stgit@manet.1015granger.net> In-Reply-To: <20160620155751.10809.22262.stgit@manet.1015granger.net> References: <20160620155751.10809.22262.stgit@manet.1015granger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: Before commit 778be232a207 ("NFS do not find client in NFSv4 pg_authenticate"), the Linux callback server replied with RPC_AUTH_ERROR / RPC_AUTH_BADCRED, instead of dropping the CB request. Let's restore that behavior so the server has a chance to do something useful about it, and provide a warning that helps admins correct the problem. Fixes: 778be232a207 ("NFS do not find client in NFSv4 ...") Signed-off-by: Chuck Lever --- fs/nfs/callback_xdr.c | 6 +++++- net/sunrpc/svc.c | 5 +++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c index d81f96a..656f68f 100644 --- a/fs/nfs/callback_xdr.c +++ b/fs/nfs/callback_xdr.c @@ -925,7 +925,7 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r if (hdr_arg.minorversion == 0) { cps.clp = nfs4_find_client_ident(SVC_NET(rqstp), hdr_arg.cb_ident); if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp)) - return rpc_drop_reply; + goto out_invalidcred; } cps.minorversion = hdr_arg.minorversion; @@ -953,6 +953,10 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r nfs_put_client(cps.clp); dprintk("%s: done, status = %u\n", __func__, ntohl(status)); return rpc_success; + +out_invalidcred: + pr_warn_ratelimited("NFS: NFSv4 callback contains invalid cred\n"); + return rpc_autherr_badcred; } /* diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index 87290a5..c5b0cb4 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -1194,6 +1194,11 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) procp->pc_release(rqstp, NULL, rqstp->rq_resp); goto dropit; } + if (*statp == rpc_autherr_badcred) { + if (procp->pc_release) + procp->pc_release(rqstp, NULL, rqstp->rq_resp); + goto err_bad_auth; + } if (*statp == rpc_success && (xdr = procp->pc_encode) && !xdr(rqstp, resv->iov_base+resv->iov_len, rqstp->rq_resp)) {