/* 
   Unix SMB/Netbios implementation.
   Version 3.0

   Winbind daemon - pam auth funcions

   Copyright (C) Andrew Tridgell 2000
   Copyright (C) Tim Potter 2001
   Copyright (C) Andrew Bartlett 2001
   
   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 "winbindd.h"

/* Return a password structure from a username.  Specify whether cached data 
   can be returned. */

enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state) 
{
	NTSTATUS result;
	fstring name_domain, name_user;
	int passlen;
	unsigned char trust_passwd[16];
	time_t last_change_time;
	auth_usersupplied_info *user_info;
        uint32 smb_uid_low;
        NET_USER_INFO_3 info3;
	NET_ID_INFO_CTR ctr;
        struct cli_state *cli;

	DEBUG(3, ("[%5d]: pam auth %s\n", state->pid,
		  state->request.data.auth.user));

	/* Parse domain and username */

	parse_domain_user(state->request.data.auth.user, name_domain, 
                          name_user);

	/* don't allow the null domain */

	if (strcmp(name_domain,"") == 0) 
		return WINBINDD_ERROR;

	passlen = strlen(state->request.data.auth.pass);
		
	if (state->request.data.auth.pass[0])
		make_user_info_winbind(&user_info, 
                                       name_user, name_domain,
                                       state->request.data.auth.pass);
	else
		return WINBINDD_ERROR;
	
	/*
	 * Get the machine account password for our primary domain
	 */

	if (!secrets_fetch_trust_account_password(
                lp_workgroup(), trust_passwd, &last_change_time)) {
		DEBUG(0, ("winbindd_pam_auth: could not fetch trust account "
                          "password for domain %s\n", lp_workgroup()));
		return WINBINDD_ERROR;
	}

	/* We really don't care what LUID we give the user. */

	generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False);

	ZERO_STRUCT(info3);

        result = cm_get_netlogon_cli(lp_workgroup(), trust_passwd, &cli);

        if (!NT_STATUS_IS_OK(result)) {
                DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
                goto done;
        }

	result = cli_nt_login_network(cli, user_info, smb_uid_low, 
				      &ctr, &info3);

        free_user_info(&user_info);

        cli_shutdown(cli);
        
 done:
	return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
}

/* Challenge Response Authentication Protocol */

enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state) 
{
	NTSTATUS result;
	fstring name_domain, name_user;
	unsigned char trust_passwd[16];
	time_t last_change_time;

	auth_usersupplied_info *user_info;
        uint32 smb_uid_low;
        NET_USER_INFO_3 info3;
	NET_ID_INFO_CTR ctr;
        struct cli_state *cli;

	DEBUG(3, ("[%5d]: pam auth crap %s\n", state->pid,
		  state->request.data.auth_crap.user));

	/* Parse domain and username */

	parse_domain_user(state->request.data.auth_crap.user, name_domain, 
                          name_user);

       	make_user_info_winbind_crap(
                &user_info, name_user, 
                name_domain, state->request.data.auth_crap.chal,
                (uchar *)state->request.data.auth_crap.lm_resp,
                state->request.data.auth_crap.lm_resp_len,
                (uchar *)state->request.data.auth_crap.nt_resp,
                state->request.data.auth_crap.nt_resp_len);
	
	/*
	 * Get the machine account password for our primary domain
	 */

	if (!secrets_fetch_trust_account_password(
                lp_workgroup(), trust_passwd, &last_change_time)) {
		DEBUG(0, ("winbindd_pam_auth: could not fetch trust account "
                          "password for domain %s\n", lp_workgroup()));
		return WINBINDD_ERROR;
	}

	/* We really don't care what LUID we give the user. */

	generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False);

	ZERO_STRUCT(info3);

        result = cm_get_netlogon_cli(lp_workgroup(), trust_passwd, &cli);

        if (!NT_STATUS_IS_OK(result)) {
                DEBUG(3, ("could not open handle to NETLOGON pipe\n"));
                goto done;
        }

	result = cli_nt_login_network(cli, user_info, smb_uid_low, 
				      &ctr, &info3);

        free_user_info(&user_info);

        cli_shutdown(cli);

 done:
	return NT_STATUS_IS_OK(result) ? WINBINDD_OK : WINBINDD_ERROR;
}

/* Change a user password */

enum winbindd_result winbindd_pam_chauthtok(struct winbindd_cli_state *state)
{
    char *oldpass, *newpass;
    fstring domain, user;
    uchar nt_oldhash[16];
    uchar lm_oldhash[16];

    DEBUG(3, ("[%5d]: pam chauthtok %s\n", state->pid,
	      state->request.data.chauthtok.user));

    /* Setup crap */

    if (state == NULL) return WINBINDD_ERROR;

    parse_domain_user(state->request.data.chauthtok.user, domain, user);

    oldpass = state->request.data.chauthtok.oldpass;
    newpass = state->request.data.chauthtok.newpass;

    nt_lm_owf_gen(oldpass, nt_oldhash, lm_oldhash);

    /* Change password */

#if 0

    /* XXX */

    if (!msrpc_sam_ntchange_pwd(server_state.controller, domain, user,
                               lm_oldhash, nt_oldhash, newpass)) {
        DEBUG(0, ("password change failed for user %s/%s\n", domain, user));
        return WINBINDD_ERROR;
    }
#endif
    
    return WINBINDD_OK;
}