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/*
Unix SMB/CIFS implementation.
code to manipulate domain credentials
Copyright (C) Andrew Tridgell 1997-2003
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/*
initialise the credentials state and return the initial credentials
to be sent as part of a netr_ServerAuthenticate*() call.
this call is made after the netr_ServerReqChallenge call
*/
void creds_init(struct netr_CredentialState *creds,
const struct netr_Credential *client_challenge,
const struct netr_Credential *server_challenge,
const uint8 machine_password[16],
struct netr_Credential *initial_creds)
{
struct netr_Credential time_cred;
uint32 sum[2];
uint8 sum2[8];
sum[0] = IVAL(client_challenge->data, 0) + IVAL(server_challenge->data, 0);
sum[1] = IVAL(client_challenge->data, 4) + IVAL(server_challenge->data, 4);
SIVAL(sum2,0,sum[0]);
SIVAL(sum2,4,sum[1]);
cred_hash1(creds->session_key, sum2, machine_password);
creds->sequence = 0;
SIVAL(time_cred.data, 0, IVAL(client_challenge->data, 0));
SIVAL(time_cred.data, 4, IVAL(client_challenge->data, 4));
cred_hash2(creds->cred2.data, time_cred.data, creds->session_key);
creds->cred1 = *server_challenge;
*initial_creds = creds->cred2;
}
/*
check that a credentials reply is correct
*/
BOOL creds_check(struct netr_CredentialState *creds,
const struct netr_Credential *received_credentials)
{
struct netr_Credential cred2, time_cred;
uint32 sequence = creds->sequence?creds->sequence+1:0;
SIVAL(time_cred.data, 0, IVAL(creds->cred1.data, 0) + sequence);
SIVAL(time_cred.data, 4, IVAL(creds->cred1.data, 4));
cred_hash2(cred2.data, time_cred.data, creds->session_key);
if (memcmp(received_credentials->data, cred2.data, 8) != 0) {
DEBUG(2,("credentials check failed\n"));
return False;
}
return True;
}
/*
produce the next authenticator in the sequence ready to send to
the server
*/
void creds_authenticator(struct netr_CredentialState *creds,
struct netr_Authenticator *next)
{
struct netr_Credential cred2;
struct netr_Credential time_cred;
if (creds->sequence == 0) {
creds->sequence = time(NULL);
}
/* this step size is quite arbitrary - the client can choose
any sequence number it likes */
creds->sequence += 2;
creds->cred1 = creds->cred2;
SIVAL(time_cred.data, 0, IVAL(creds->cred2.data, 0) + creds->sequence);
SIVAL(time_cred.data, 4, IVAL(creds->cred2.data, 4));
cred_hash2(cred2.data, time_cred.data, creds->session_key);
creds->cred2 = cred2;
next->cred = creds->cred2;
next->timestamp = creds->sequence;
}
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