Patch "fs/cifs: correctly to anonymous authentication for the NTLM(v2) authentication" has been added to the 4.4-stable tree

gregkh
2016-05-29T21:52:07Z

This is a note to let you know that I've just added the patch titled

fs/cifs: correctly to anonymous authentication for the NTLM(v2) authentication

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
fs-cifs-correctly-to-anonymous-authentication-for-the-ntlm-v2-authentication.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.

>From 1a967d6c9b39c226be1b45f13acd4d8a5ab3dc44 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Tue, 3 May 2016 10:52:30 +0200
Subject: fs/cifs: correctly to anonymous authentication for the NTLM(v2) authentication

From: Stefan Metzmacher <metze@samba.org>

commit 1a967d6c9b39c226be1b45f13acd4d8a5ab3dc44 upstream.

Only server which map unknown users to guest will allow
access using a non-null NTLMv2_Response.

For Samba it's the "map to guest = bad user" option.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11913

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/cifs/sess.c | 32 ++++++++++++++++++--------------
1 file changed, 18 insertions(+), 14 deletions(-)

--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -895,22 +895,26 @@ sess_auth_ntlmv2(struct sess_data *sess_
/* LM2 password would be here if we supported it */
pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;

- /* calculate nlmv2 response and session key */
- rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
- if (rc) {
- cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
- goto out;
- }
+ if (ses->user_name != NULL) {
+ /* calculate nlmv2 response and session key */
+ rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
+ if (rc) {
+ cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
+ goto out;
+ }

- memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
- ses->auth_key.len - CIFS_SESS_KEY_SIZE);
- bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
+ memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
+ ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+ bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;

- /* set case sensitive password length after tilen may get
- * assigned, tilen is 0 otherwise.
- */
- pSMB->req_no_secext.CaseSensitivePasswordLength =
- cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+ /* set case sensitive password length after tilen may get
+ * assigned, tilen is 0 otherwise.
+ */
+ pSMB->req_no_secext.CaseSensitivePasswordLength =
+ cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+ } else {
+ pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
+ }

if (ses->capabilities & CAP_UNICODE) {
if (sess_data->iov[0].iov_len % 2) {

Patches currently in stable-queue which might be from metze@samba.org are

queue-4.4/fs-cifs-correctly-to-anonymous-authentication-for-the-ntlm-v1-authentication.patch
queue-4.4/fs-cifs-correctly-to-anonymous-authentication-for-the-lanman-authentication.patch
queue-4.4/fs-cifs-correctly-to-anonymous-authentication-for-the-ntlm-v2-authentication.patch
queue-4.4/fs-cifs-correctly-to-anonymous-authentication-via-ntlmssp.patch