linux-kernel - [PATCH 3.16 145/204] SMB3: Validate negotiate request must always be signed

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Message-ID: <lsq.1514480744.843261980@decadent.org.uk>
Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Steve French" <smfrench@...il.com>,
        "Ronnie Sahlberg" <lsahlber.redhat.com@...adent.org.uk>
Subject: [PATCH 3.16 145/204] SMB3: Validate negotiate request must always
 be signed

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Steve French <smfrench@...il.com>

commit 4587eee04e2ac7ac3ac9fa2bc164fb6e548f99cd upstream.

According to MS-SMB2 3.2.55 validate_negotiate request must
always be signed. Some Windows can fail the request if you send it unsigned

See kernel bugzilla bug 197311

Acked-by: Ronnie Sahlberg <lsahlber.redhat.com>
Signed-off-by: Steve French <smfrench@...il.com>
[bwh: Backported to 3.16: s/sync_hdr\.Flags/Flags/]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/cifs/smb2pdu.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1342,6 +1342,9 @@ SMB2_ioctl(const unsigned int xid, struc
 	} else
 		iov[0].iov_len = get_rfc1002_length(req) + 4;
 
+	/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
+	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
+		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 
 	rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
 	rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;