/* 
   Unix SMB/Netbios implementation.
   Version 3.0

   Winbind daemon - pam auuth funcions

   Copyright (C) Andrew Tridgell 2000
   
   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"

/* Copy of parse_domain_user from winbindd_util.c.  Parse a string of the
   form DOMAIN/user into a domain and a user */

static void parse_domain_user(char *domuser, fstring domain, fstring user)
{
        char *p;
        char *sep = lp_winbind_separator();
        if (!sep) sep = "\\";
        p = strchr_m(domuser,*sep);
        if (!p) p = strchr_m(domuser,'\\');
        if (!p) {
                fstrcpy(domain,"");
                fstrcpy(user, domuser);
                return;
        }
        
        fstrcpy(user, p+1);
        fstrcpy(domain, domuser);
        domain[PTR_DIFF(p, domuser)] = 0;
        strupper(domain);
}

/* 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) 
{
	BOOL result, user_exists;
	fstring name_domain, name_user;
	int passlen;

	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);

	/* So domain_client_validate() actually opens a new connection
	   for each authentication performed.  This can theoretically
	   be optimised to use an already open IPC$ connection. */

	result = domain_client_validate(name_user, name_domain,
					state->request.data.auth.pass,
					passlen,
					state->request.data.auth.pass,
					passlen, &user_exists, 
					server_state.controller);

	return 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;
}