Set UID in sess_auth_rawntlmssp_authenticate too

A user complained that they were unable to login to their cifs share
after a kernel update. From the wiretrace we can see that the server
returns different UIDs as response to NTLMSSP_NEGOTIATE and NTLMSSP_AUTH
phases.

With changes in the authentication code, we no longer set the
cifs_sess->Suid returned in response to the NTLM_AUTH phase and continue
to use the UID sent in response to the NTLMSSP_NEGOTIATE phase. This
results in the server denying access to the user when the user attempts
to do a tcon connect.

See https://bugzilla.redhat.com/show_bug.cgi?id=1163927

A test kernel containing patch was tested successfully by the user.

Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Steve French <steve.french@primarydata.com>

diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 57db63ff88da282cca615c998e0e495ccc58ee15..446cb7fb3f58e481bd40cc74ba0eb63298b0acbe 100644 (file)
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -1303,6 +1303,11 @@ sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
        if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
                cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
 
+       if (ses->Suid != smb_buf->Uid) {
+               ses->Suid = smb_buf->Uid;
+               cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
+       }
+
        bytes_remaining = get_bcc(smb_buf);
        bcc_ptr = pByteArea(smb_buf);
        blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);