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#include "config.h"
#ifdef NTLM_ENABLE
#include "fetchmail.h"
#include "i18n.h"
#include "ntlm.h"
#include "socket.h"
#include <string.h>
int ntlm_helper(int sock, struct query *ctl, const char *proto)
{
/*
* NTLM support by Grant Edwards.
*
* Handle MS-Exchange NTLM authentication method. This is the same
* as the NTLM auth used by Samba for SMB related services. We just
* encode the packets in base64 instead of sending them out via a
* network interface.
*
* Much source (ntlm.h, smb*.c smb*.h) was borrowed from Samba.
*/
tSmbNtlmAuthRequest request;
tSmbNtlmAuthChallenge challenge;
tSmbNtlmAuthResponse response;
char msgbuf[2048];
int result;
if ((result = gen_recv(sock, msgbuf, sizeof msgbuf)))
return result;
if (msgbuf[0] != '+' && strspn(msgbuf+1, " \t") < strlen(msgbuf+1)) {
if (outlevel >= O_VERBOSE) {
report(stdout, GT_("Warning: received malformed challenge to \"AUTH(ENTICATE) NTLM\"!\n"));
}
result = PS_AUTHFAIL;
goto cancelfail;
}
buildSmbNtlmAuthRequest(&request,ctl->remotename,NULL);
if (outlevel >= O_DEBUG)
dumpSmbNtlmAuthRequest(stdout, &request);
memset(msgbuf,0,sizeof msgbuf);
to64frombits (msgbuf, &request, SmbLength(&request), sizeof msgbuf);
if (outlevel >= O_MONITOR)
report(stdout, "%s> %s\n", proto, msgbuf);
strcat(msgbuf,"\r\n");
SockWrite (sock, msgbuf, strlen (msgbuf));
if ((result = gen_recv(sock, msgbuf, sizeof msgbuf)))
goto cancelfail;
/*
* < 0: decoding error
* >= 0 < 32: too short to be plausible
*/
if ((result = from64tobits (&challenge, msgbuf, sizeof(challenge))) < 0
|| result < 32)
{
report (stderr, GT_("could not decode BASE64 challenge\n"));
/* We do not goto cancelfail; the server has already sent the
* tagged reply, so the protocol exchange has ended, no need
* for us to send the asterisk. */
return PS_AUTHFAIL;
}
/* validate challenge:
* - ident
* - message type
* - that offset points into buffer
* - that offset + length does not wrap
* - that offset + length is not bigger than buffer */
if (0 != memcmp("NTLMSSP", challenge.ident, 8)
|| challenge.msgType != 2
|| challenge.uDomain.offset > (unsigned)result
|| (challenge.uDomain.offset + challenge.uDomain.len) < challenge.uDomain.offset
|| (challenge.uDomain.offset + challenge.uDomain.len) > (unsigned)result)
{
report (stderr, GT_("NTLM challenge contains invalid data.\n"));
result = PS_AUTHFAIL;
goto cancelfail;
}
if (outlevel >= O_DEBUG)
dumpSmbNtlmAuthChallenge(stdout, &challenge);
buildSmbNtlmAuthResponse(&challenge, &response,ctl->remotename,ctl->password);
if (outlevel >= O_DEBUG)
dumpSmbNtlmAuthResponse(stdout, &response);
memset(msgbuf,0,sizeof msgbuf);
to64frombits (msgbuf, &response, SmbLength(&response), sizeof msgbuf);
if (outlevel >= O_MONITOR)
report(stdout, "%s> %s\n", proto, msgbuf);
strcat(msgbuf,"\r\n");
SockWrite (sock, msgbuf, strlen (msgbuf));
return PS_SUCCESS;
cancelfail: /* cancel authentication and return failure */
{
if (outlevel >= O_MONITOR)
report(stdout, "%s> *\n", proto);
SockWrite(sock, "*\r\n", 3);
return result;
}
}
#endif /* NTLM_ENABLE */
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