SMB3: Warn user if trying to sign connection that authenticated as guest

It can be confusing if user ends up authenticated as guest but they
requested signing (server will return error validating signed packets)
so add log message for this.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
CC: Stable <stable@vger.kernel.org>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index b4c58a1db1ae6d6873ea0871d4e116295eadcf1a..d499ce265c3bad7ba970a9ad2f9a6dec3485e14c 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1176,6 +1176,8 @@ SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
        while (sess_data->func)
                sess_data->func(sess_data);
 
+       if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
+               cifs_dbg(VFS, "signing requested but authenticated as guest\n");
        rc = sess_data->result;
 out:
        kfree(sess_data);