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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
*/
static 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 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 = time(NULL);
SIVAL(time_cred.data, 0, IVAL(client_challenge->data, 0));
SIVAL(time_cred.data, 4, IVAL(client_challenge->data, 4));
cred_hash2(creds->client.data, time_cred.data, creds->session_key);
SIVAL(time_cred.data, 0, IVAL(server_challenge->data, 0));
SIVAL(time_cred.data, 4, IVAL(server_challenge->data, 4));
cred_hash2(creds->server.data, time_cred.data, creds->session_key);
creds->seed = creds->client;
}
/*
step the credentials to the next element in the chain
*/
static void creds_step(struct netr_CredentialState *creds)
{
struct netr_Credential time_cred;
creds->sequence += 2;
DEBUG(5,("\tseed %08x:%08x\n",
IVAL(creds->seed.data, 0), IVAL(creds->seed.data, 4)));
SIVAL(time_cred.data, 0, IVAL(creds->seed.data, 0) + creds->sequence);
SIVAL(time_cred.data, 4, IVAL(creds->seed.data, 4));
DEBUG(5,("\tseed+time %08x:%08x\n", IVAL(time_cred.data, 0), IVAL(time_cred.data, 4)));
cred_hash2(creds->client.data, time_cred.data, creds->session_key);
DEBUG(5,("\tCLIENT %08x:%08x\n",
IVAL(creds->client.data, 0), IVAL(creds->client.data, 4)));
SIVAL(time_cred.data, 0, IVAL(creds->seed.data, 0) + creds->sequence + 1);
SIVAL(time_cred.data, 4, IVAL(creds->seed.data, 4));
DEBUG(5,("\tseed+time+1 %08x:%08x\n",
IVAL(time_cred.data, 0), IVAL(time_cred.data, 4)));
cred_hash2(creds->server.data, time_cred.data, creds->session_key);
DEBUG(5,("\tSERVER %08x:%08x\n",
IVAL(creds->server.data, 0), IVAL(creds->server.data, 4)));
creds->seed = time_cred;
}
/*
initialise the credentials chain and return the first client
credentials
*/
void creds_client_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_credential)
{
creds_init(creds, client_challenge, server_challenge, machine_password);
*initial_credential = creds->client;
}
/*
check that a credentials reply from a server is correct
*/
BOOL creds_client_check(struct netr_CredentialState *creds,
const struct netr_Credential *received_credentials)
{
if (memcmp(received_credentials->data, creds->server.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_client_authenticator(struct netr_CredentialState *creds,
struct netr_Authenticator *next)
{
creds_step(creds);
next->cred = creds->client;
next->timestamp = creds->sequence;
}
/*
encrypt a 16 byte password buffer using the session key
*/
void creds_client_encrypt(struct netr_CredentialState *creds, struct netr_Password *pass)
{
struct netr_Password tmp;
cred_hash3(tmp.data, pass->data, creds->session_key, 1);
*pass = tmp;
}
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