This is a note to let you know that I've just added the patch titled
fs/cifs: correctly to anonymous authentication for the LANMAN 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-lanman-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@xxxxxxxxxxxxxxx> know about it.
>From fa8f3a354bb775ec586e4475bcb07f7dece97e0c Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@xxxxxxxxx>
Date: Tue, 3 May 2016 10:52:30 +0200
Subject: fs/cifs: correctly to anonymous authentication for the LANMAN authentication
From: Stefan Metzmacher <metze@xxxxxxxxx>
commit fa8f3a354bb775ec586e4475bcb07f7dece97e0c upstream.
Only server which map unknown users to guest will allow
access using a non-null LMChallengeResponse.
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@xxxxxxxxx>
Signed-off-by: Steve French <smfrench@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/cifs/sess.c | 28 ++++++++++++++++------------
1 file changed, 16 insertions(+), 12 deletions(-)
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -678,20 +678,24 @@ sess_auth_lanman(struct sess_data *sess_
pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
- /* no capabilities flags in old lanman negotiation */
- pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
+ if (ses->user_name != NULL) {
+ /* no capabilities flags in old lanman negotiation */
+ pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
- /* Calculate hash with password and copy into bcc_ptr.
- * Encryption Key (stored as in cryptkey) gets used if the
- * security mode bit in Negottiate Protocol response states
- * to use challenge/response method (i.e. Password bit is 1).
- */
- rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
- ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
- true : false, lnm_session_key);
+ /* Calculate hash with password and copy into bcc_ptr.
+ * Encryption Key (stored as in cryptkey) gets used if the
+ * security mode bit in Negottiate Protocol response states
+ * to use challenge/response method (i.e. Password bit is 1).
+ */
+ rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
+ ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
+ true : false, lnm_session_key);
- memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
- bcc_ptr += CIFS_AUTH_RESP_SIZE;
+ memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
+ bcc_ptr += CIFS_AUTH_RESP_SIZE;
+ } else {
+ pSMB->old_req.PasswordLength = 0;
+ }
/*
* can not sign if LANMAN negotiated so no need
Patches currently in stable-queue which might be from metze@xxxxxxxxx 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
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