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/* ========================================================================
* Copyright 2018 Eduardo Chappa
* Copyright 2015 Imagination Technologies
* Copyright 1988-2008 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: NT LAN Manager authenticator
*
* Author: Maciej W. Rozycki
*
* Date: 25 January 2015
* Last Edited: 25 January 2015
*/
#include <ntlm.h>
long auth_ntlm_client (authchallenge_t challenger,authrespond_t responder,
char *service,NETMBX *mb,void *stream,
unsigned long *trial,char *user);
AUTHENTICATOR auth_ntl = { /* secure, has full auth, hidden */
AU_SECURE | AU_AUTHUSER | AU_HIDE,
"NTLM", /* authenticator name */
NIL, /* always valid */
auth_ntlm_client, /* client method */
NIL, /* no server method */
NIL /* next authenticator */
};
/* Client authenticator
* Accepts: challenger function
* responder function
* SASL service name
* parsed network mailbox structure
* stream argument for functions
* pointer to current trial count
* returned user name
* Returns: T if success, NIL otherwise, number of trials incremented if retry
*/
long auth_ntlm_client (authchallenge_t challenger, authrespond_t responder,
char *service, NETMBX *mb, void *stream,
unsigned long *trial, char *user)
{
tSmbNtlmAuthChallenge *challenge;
tSmbNtlmAuthResponse response;
tSmbNtlmAuthRequest request;
char tbuf[MAILTMPLEN];
char ubuf[MAILTMPLEN];
char *pass = NIL;
unsigned long clen;
unsigned long ulen;
unsigned long dlen;
long ret = NIL;
char *sep;
/* get initial (empty) challenge */
if (challenge = (*challenger) (stream, &clen)) {
fs_give ((void **) &challenge);
mm_login (mb, user, &pass, *trial);
if (!pass) { /* user requested abort */
(*responder) (stream, NIL, 0);
*trial = 0; /* cancel subsequent attempts */
ret = LONGT; /* will get a BAD response back */
} else {
/* translate domain\user to user@domain */
/* otherwise buildSmbNtlmAuthResponse */
/* will override the domain requested with */
/* one returned by the challenge message */
sep = strchr (user, '\\');
if (*sep) {
dlen = sep - user;
ulen = strlen (sep + 1);
memcpy (ubuf, sep + 1, ulen);
ubuf[ulen] = '@';
memcpy (ubuf + ulen + 1, user, dlen);
ubuf[ulen + dlen + 1] = '\0';
user = ubuf;
}
buildSmbNtlmAuthRequest (&request, user, NULL);
/* send a negotiate message */
if ((*responder) (stream, (void *) &request, SmbLength (&request)) &&
(challenge = (*challenger) (stream, &clen))) {
/* interpret the challenge message */
buildSmbNtlmAuthResponse (challenge, &response, user, pass);
fs_give ((void **) &challenge);
/* send a response message */
if ((*responder) (stream, (void *) &response, SmbLength (&response))) {
if (challenge = (*challenger) (stream, &clen))
fs_give ((void **) &challenge);
else {
++*trial; /* can try again if necessary */
ret = LONGT; /* check the authentication */
}
}
}
if(pass) fs_give((void **) &pass);
}
}
if(pass) fs_give((void **) &pass);
if (!ret) *trial = 65535; /* don't retry if bad protocol */
return ret;
}
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