4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stefan Metzmacher <metze@xxxxxxxxx> commit 777f69b8d26bf35ade4a76b08f203c11e048365d upstream. Only server which map unknown users to guest will allow access using a non-null NTChallengeResponse. 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 | 41 +++++++++++++++++++++++------------------ 1 file changed, 23 insertions(+), 18 deletions(-) --- a/fs/cifs/sess.c +++ b/fs/cifs/sess.c @@ -781,26 +781,31 @@ sess_auth_ntlm(struct sess_data *sess_da capabilities = cifs_ssetup_hdr(ses, pSMB); pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities); - pSMB->req_no_secext.CaseInsensitivePasswordLength = - cpu_to_le16(CIFS_AUTH_RESP_SIZE); - pSMB->req_no_secext.CaseSensitivePasswordLength = - cpu_to_le16(CIFS_AUTH_RESP_SIZE); + if (ses->user_name != NULL) { + pSMB->req_no_secext.CaseInsensitivePasswordLength = + cpu_to_le16(CIFS_AUTH_RESP_SIZE); + pSMB->req_no_secext.CaseSensitivePasswordLength = + cpu_to_le16(CIFS_AUTH_RESP_SIZE); - /* calculate ntlm response and session key */ - rc = setup_ntlm_response(ses, sess_data->nls_cp); - if (rc) { - cifs_dbg(VFS, "Error %d during NTLM authentication\n", - rc); - goto out; - } + /* calculate ntlm response and session key */ + rc = setup_ntlm_response(ses, sess_data->nls_cp); + if (rc) { + cifs_dbg(VFS, "Error %d during NTLM authentication\n", + rc); + goto out; + } - /* copy ntlm response */ - memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, - CIFS_AUTH_RESP_SIZE); - bcc_ptr += CIFS_AUTH_RESP_SIZE; - memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, - CIFS_AUTH_RESP_SIZE); - bcc_ptr += CIFS_AUTH_RESP_SIZE; + /* copy ntlm response */ + memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, + CIFS_AUTH_RESP_SIZE); + bcc_ptr += CIFS_AUTH_RESP_SIZE; + memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE, + CIFS_AUTH_RESP_SIZE); + bcc_ptr += CIFS_AUTH_RESP_SIZE; + } else { + pSMB->req_no_secext.CaseInsensitivePasswordLength = 0; + pSMB->req_no_secext.CaseSensitivePasswordLength = 0; + } if (ses->capabilities & CAP_UNICODE) { /* unicode strings must be word aligned */ -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html