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/*
Unix SMB/CIFS implementation.
code to manipulate domain credentials
Copyright (C) Andrew Tridgell 1997-1998
Largely rewritten by Jeremy Allison 2005.
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"
/****************************************************************************
Represent a credential as a string.
****************************************************************************/
char *credstr(const uchar *cred)
{
static fstring buf;
slprintf(buf, sizeof(buf) - 1, "%02X%02X%02X%02X%02X%02X%02X%02X",
cred[0], cred[1], cred[2], cred[3],
cred[4], cred[5], cred[6], cred[7]);
return buf;
}
/****************************************************************************
Setup the session key and the client and server creds in dc.
Used by both client and server creds setup.
****************************************************************************/
static void creds_init_64(struct dcinfo *dc,
const DOM_CHAL *clnt_chal_in,
const DOM_CHAL *srv_chal_in,
const char mach_pw[16])
{
uint32 sum[2];
unsigned char sum2[8];
/* Just in case this isn't already there */
memcpy(dc->mach_pw, mach_pw, 16);
sum[0] = IVAL(clnt_chal_in->data, 0) + IVAL(srv_chal_in->data, 0);
sum[1] = IVAL(clnt_chal_in->data, 4) + IVAL(srv_chal_in->data, 4);
SIVAL(sum2,0,sum[0]);
SIVAL(sum2,4,sum[1]);
ZERO_STRUCT(dc->sess_key);
des_crypt128(dc->sess_key, sum2, dc->mach_pw);
/* debug output */
DEBUG(5,("creds_init_64\n"));
DEBUG(5,(" clnt_chal_in: %s\n", credstr(clnt_chal_in->data)));
DEBUG(5,(" srv_chal_in : %s\n", credstr(srv_chal_in->data)));
DEBUG(5,(" clnt+srv : %s\n", credstr(sum2)));
DEBUG(5,(" sess_key_out : %s\n", credstr(dc->sess_key)));
/* Generate the next client and server creds. */
des_crypt112(dc->clnt_chal.data, /* output */
clnt_chal_in->data, /* input */
dc->sess_key, /* input */
1);
des_crypt112(dc->srv_chal.data, /* output */
srv_chal_in->data, /* input */
dc->sess_key, /* input */
1);
/* Seed is the client chal. */
memcpy(dc->seed_chal.data, dc->clnt_chal.data, 8);
}
/****************************************************************************
Utility function to step credential chain one forward.
Deliberately doesn't update the seed. See reseed comment below.
****************************************************************************/
static void creds_step(struct dcinfo *dc)
{
DOM_CHAL time_chal;
DEBUG(5,("\tsequence = 0x%x\n", (unsigned int)dc->sequence ));
DEBUG(5,("\tseed: %s\n", credstr(dc->seed_chal.data) ));
SIVAL(time_chal.data, 0, IVAL(dc->seed_chal.data, 0) + dc->sequence);
SIVAL(time_chal.data, 4, IVAL(dc->seed_chal.data, 4));
DEBUG(5,("\tseed+seq %s\n", credstr(time_chal.data) ));
des_crypt112(dc->clnt_chal.data, time_chal.data, dc->sess_key, 1);
DEBUG(5,("\tCLIENT %s\n", credstr(dc->clnt_chal.data) ));
SIVAL(time_chal.data, 0, IVAL(dc->seed_chal.data, 0) + dc->sequence + 1);
SIVAL(time_chal.data, 4, IVAL(dc->seed_chal.data, 4));
DEBUG(5,("\tseed+seq+1 %s\n", credstr(time_chal.data) ));
des_crypt112(dc->srv_chal.data, time_chal.data, dc->sess_key, 1);
DEBUG(5,("\tSERVER %s\n", credstr(dc->srv_chal.data) ));
}
/****************************************************************************
Create a server credential struct.
****************************************************************************/
void creds_server_init(struct dcinfo *dc,
DOM_CHAL *clnt_chal,
DOM_CHAL *srv_chal,
const char mach_pw[16],
DOM_CHAL *init_chal_out)
{
DEBUG(10,("creds_server_init: client chal : %s\n", credstr(clnt_chal->data) ));
DEBUG(10,("creds_server_init: server chal : %s\n", credstr(srv_chal->data) ));
dump_data_pw("creds_server_init: machine pass", (const unsigned char *)mach_pw, 16);
/* Generate the session key and the next client and server creds. */
creds_init_64(dc,
clnt_chal,
srv_chal,
mach_pw);
dump_data_pw("creds_server_init: session key", dc->sess_key, 16);
DEBUG(10,("creds_server_init: clnt : %s\n", credstr(dc->clnt_chal.data) ));
DEBUG(10,("creds_server_init: server : %s\n", credstr(dc->srv_chal.data) ));
DEBUG(10,("creds_server_init: seed : %s\n", credstr(dc->seed_chal.data) ));
memcpy(init_chal_out->data, dc->srv_chal.data, 8);
}
/****************************************************************************
Check a credential sent by the client.
****************************************************************************/
BOOL creds_server_check(const struct dcinfo *dc, const DOM_CHAL *rcv_cli_chal_in)
{
if (memcmp(dc->clnt_chal.data, rcv_cli_chal_in->data, 8)) {
DEBUG(5,("creds_server_check: challenge : %s\n", credstr(rcv_cli_chal_in->data)));
DEBUG(5,("calculated: %s\n", credstr(dc->clnt_chal.data)));
DEBUG(2,("creds_server_check: credentials check failed.\n"));
return False;
}
DEBUG(10,("creds_server_check: credentials check OK.\n"));
return True;
}
/****************************************************************************
Replace current seed chal. Internal function - due to split server step below.
****************************************************************************/
static void creds_reseed(struct dcinfo *dc)
{
DOM_CHAL time_chal;
SIVAL(time_chal.data, 0, IVAL(dc->seed_chal.data, 0) + dc->sequence + 1);
SIVAL(time_chal.data, 4, IVAL(dc->seed_chal.data, 4));
dc->seed_chal = time_chal;
DEBUG(5,("cred_reseed: seed %s\n", credstr(dc->seed_chal.data) ));
}
/****************************************************************************
Step the server credential chain one forward.
****************************************************************************/
BOOL creds_server_step(struct dcinfo *dc, const DOM_CRED *received_cred, DOM_CRED *cred_out)
{
dc->sequence = received_cred->timestamp.time;
creds_step(dc);
/* Create the outgoing credentials */
cred_out->timestamp.time = dc->sequence + 1;
cred_out->challenge = dc->srv_chal;
creds_reseed(dc);
return creds_server_check(dc, &received_cred->challenge);
}
/****************************************************************************
Create a client credential struct.
****************************************************************************/
void creds_client_init(struct dcinfo *dc,
DOM_CHAL *clnt_chal,
DOM_CHAL *srv_chal,
const unsigned char mach_pw[16],
DOM_CHAL *init_chal_out)
{
dc->sequence = time(NULL);
DEBUG(10,("creds_client_init: client chal : %s\n", credstr(clnt_chal->data) ));
DEBUG(10,("creds_client_init: server chal : %s\n", credstr(srv_chal->data) ));
dump_data_pw("creds_client_init: machine pass", (const unsigned char *)mach_pw, 16);
/* Generate the session key and the next client and server creds. */
creds_init_64(dc,
clnt_chal,
srv_chal,
mach_pw);
dump_data_pw("creds_client_init: session key", dc->sess_key, 16);
DEBUG(10,("creds_client_init: clnt : %s\n", credstr(dc->clnt_chal.data) ));
DEBUG(10,("creds_client_init: server : %s\n", credstr(dc->srv_chal.data) ));
DEBUG(10,("creds_client_init: seed : %s\n", credstr(dc->seed_chal.data) ));
memcpy(init_chal_out->data, dc->clnt_chal.data, 8);
}
/****************************************************************************
Check a credential returned by the server.
****************************************************************************/
BOOL creds_client_check(const struct dcinfo *dc, const DOM_CHAL *rcv_srv_chal_in)
{
if (memcmp(dc->srv_chal.data, rcv_srv_chal_in->data, 8)) {
DEBUG(5,("creds_client_check: challenge : %s\n", credstr(rcv_srv_chal_in->data)));
DEBUG(5,("calculated: %s\n", credstr(dc->srv_chal.data)));
DEBUG(0,("creds_client_check: credentials check failed.\n"));
return False;
}
DEBUG(10,("creds_client_check: credentials check OK.\n"));
return True;
}
/****************************************************************************
Step the client credentials to the next element in the chain, updating the
current client and server credentials and the seed
produce the next authenticator in the sequence ready to send to
the server
****************************************************************************/
void creds_client_step(struct dcinfo *dc, DOM_CRED *next_cred_out)
{
dc->sequence += 2;
creds_step(dc);
creds_reseed(dc);
next_cred_out->challenge = dc->clnt_chal;
next_cred_out->timestamp.time = dc->sequence;
}
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