Attachment 2028 Details for Bug 3916 – Modified pam_winbind.c with addition log messages to syslog

Modified pam_winbind.c with addition log messages to syslog

pam_winbind.c (text/plain), 38.42 KB, created by Dietrich Streifert on 2006-07-13 02:39:49 UTC

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Creator: Dietrich Streifert

Created: 2006-07-13 02:39:49 UTC

Size: 38.42 KB

patch

obsolete

>/* pam_winbind module
>
>   Copyright Andrew Tridgell <tridge@samba.org> 2000
>   Copyright Tim Potter <tpot@samba.org> 2000
>   Copyright Andrew Bartlett <abartlet@samba.org> 2002
>   Copyright Guenther Deschner <gd@samba.org> 2005-2006
>
>   largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> 
>   also contains large slabs of code from pam_unix by Elliot Lee <sopwith@redhat.com>
>   (see copyright below for full details)
>*/
>
>#include "pam_winbind.h"
>
>/* data tokens */
>
>#define MAX_PASSWD_TRIES	3
>
>/* some syslogging */
>static void _pam_log(int err, const char *format, ...)
>{
>	va_list args;
>
>	va_start(args, format);
>	openlog(MODULE_NAME, LOG_CONS|LOG_PID, LOG_AUTH);
>	vsyslog(err, format, args);
>	va_end(args);
>	closelog();
>}
>
>static void _pam_log_debug(int ctrl, int err, const char *format, ...)
>{
>	va_list args;
>
>	/* if (!(ctrl & WINBIND_DEBUG_ARG)) {
>		return;
>	}*/
>
>	va_start(args, format);
>	openlog(MODULE_NAME, LOG_CONS|LOG_PID, LOG_AUTH);
>	vsyslog(err, format, args);
>	va_end(args);
>	closelog();
>}
>
>static int _pam_parse(int argc, const char **argv, dictionary **d)
>{
>	int ctrl = 0;
>	const char *config_file = NULL;
>	_pam_log(LOG_INFO,"pam_winbind: _pam_parse 1");
>
>	if (d == NULL) {
>		goto config_from_pam;
>	}
>        _pam_log(LOG_INFO,"pam_winbind: _pam_parse 2");
>
>	for (; argc-- > 0; ++argv) {
>		if (!strncasecmp(*argv, "config", strlen("config"))) {
>			ctrl |= WINBIND_CONFIG_FILE;
>			config_file = argv[argc];
>			break;
>		}
>	}
>
>	if (config_file == NULL) {
>		config_file = PAM_WINBIND_CONFIG_FILE;
>	}
>
>        _pam_log(LOG_INFO,"pam_winbind: _pam_parse 3 mod");
>
>
>	*d = iniparser_load(CONST_DISCARD(char *, config_file));
>
>        _pam_log(LOG_INFO,"pam_winbind: _pam_parse 3 iniparser_load ok");
>
>	if (*d == NULL) {
>	        _pam_log(LOG_INFO,"pam_winbind: _pam_parse 3 *d == NULL");
>		goto config_from_pam;
>	}
>        _pam_log(LOG_INFO,"pam_winbind: _pam_parse 3a");
>
>	if (iniparser_getboolean(*d, CONST_DISCARD(char *, "global:debug"), False)) {
>		ctrl |= WINBIND_DEBUG_ARG;
>	}
>        _pam_log(LOG_INFO,"pam_winbind: _pam_parse 4");
>
>	if (iniparser_getboolean(*d, CONST_DISCARD(char *, "global:cached_login"), False)) {
>		ctrl |= WINBIND_CACHED_LOGIN;
>	}
>        _pam_log(LOG_INFO,"pam_winbind: _pam_parse 5");
>
>	if (iniparser_getboolean(*d, CONST_DISCARD(char *, "global:krb5_auth"), False)) {
>		ctrl |= WINBIND_KRB5_AUTH;
>	}
>        _pam_log(LOG_INFO,"pam_winbind: _pam_parse 6");
>
>	if (iniparser_getstr(*d, CONST_DISCARD(char *,"global:krb5_ccache_type")) != NULL) {
>		ctrl |= WINBIND_KRB5_CCACHE_TYPE;
>	}
>        _pam_log(LOG_INFO,"pam_winbind: _pam_parse 7");
>	
>	if ((iniparser_getstr(*d, CONST_DISCARD(char *, "global:require-membership-of")) != NULL) ||
>	    (iniparser_getstr(*d, CONST_DISCARD(char *, "global:require_membership_of")) != NULL)) {
>		ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
>	}
>        _pam_log(LOG_INFO,"pam_winbind: _pam_parse 8");
>
>
>config_from_pam:
>	/* step through arguments */
>	for (; argc-- > 0; ++argv) {
>
>		_pam_log(LOG_INFO, "pam_parse: option %s", *argv);
>
>		/* generic options */
>		if (!strcmp(*argv,"debug"))
>			ctrl |= WINBIND_DEBUG_ARG;
>		else if (!strcasecmp(*argv, "use_authtok")) 
>			ctrl |= WINBIND_USE_AUTHTOK_ARG;
>		else if (!strcasecmp(*argv, "use_first_pass"))
>			ctrl |= WINBIND_USE_FIRST_PASS_ARG;
>		else if (!strcasecmp(*argv, "try_first_pass"))
>			ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
>		else if (!strcasecmp(*argv, "unknown_ok"))
>			ctrl |= WINBIND_UNKNOWN_OK_ARG;
>		else if (!strncasecmp(*argv, "require_membership_of", strlen("require_membership_of")))
>			ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
>		else if (!strncasecmp(*argv, "require-membership-of", strlen("require-membership-of")))
>			ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
>		else if (!strcasecmp(*argv, "krb5_auth"))
>			ctrl |= WINBIND_KRB5_AUTH;
>		else if (!strncasecmp(*argv, "krb5_ccache_type", strlen("krb5_ccache_type")))
>			ctrl |= WINBIND_KRB5_CCACHE_TYPE;
>		else if (!strcasecmp(*argv, "cached_login"))
>			ctrl |= WINBIND_CACHED_LOGIN;
>		else {
>			_pam_log(LOG_ERR, "pam_parse: unknown option; %s", *argv);
>		}
>
>	}
>	return ctrl;
>};
>
>static void _pam_winbind_cleanup_func(pam_handle_t *pamh, void *data, int error_status)
>{
>	SAFE_FREE(data);
>}
>
>static const struct ntstatus_errors {
>	const char *ntstatus_string;
>	const char *error_string;
>} ntstatus_errors[] = {
>	{"NT_STATUS_OK", "Success"},
>	{"NT_STATUS_BACKUP_CONTROLLER", "No primary Domain Controler available"},
>	{"NT_STATUS_PWD_TOO_SHORT", "Password too short"},
>	{"NT_STATUS_PWD_TOO_RECENT", "The password of this user is too recent to change"},
>	{"NT_STATUS_PWD_HISTORY_CONFLICT", "Password is already in password history"},
>	{"NT_STATUS_PASSWORD_EXPIRED", "Your password has expired"},
>	{"NT_STATUS_PASSWORD_MUST_CHANGE", "You need to change your password now"},
>	{"NT_STATUS_INVALID_WORKSTATION", "You are not allowed to logon from this workstation"},
>	{"NT_STATUS_INVALID_LOGON_HOURS", "You are not allowed to logon at this time"},
>	{"NT_STATUS_ACCOUNT_EXPIRED", "Your account has expired. Please contact your System administrator"}, /* SCNR */
>	{"NT_STATUS_ACCOUNT_DISABLED", "Your account is disabled. Please contact your System administrator"}, /* SCNR */
>	{"NT_STATUS_ACCOUNT_LOCKED_OUT", "Your account has been locked. Please contact your System administrator"}, /* SCNR */
>	{"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT", "Invalid Trust Account"},
>	{"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT", "Invalid Trust Account"},
>	{"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT", "Invalid Trust Account"},
>	{"NT_STATUS_ACCESS_DENIED", "Access is denied"},
>	{NULL, NULL}
>};
>
>const char *_get_ntstatus_error_string(const char *nt_status_string) 
>{
>	int i;
>	for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
>		if (!strcasecmp(ntstatus_errors[i].ntstatus_string, nt_status_string)) {
>			return ntstatus_errors[i].error_string;
>		}
>	}
>	return NULL;
>}
>
>/* --- authentication management functions --- */
>
>/* Attempt a conversation */
>
>static int converse(pam_handle_t *pamh, int nargs,
>		    struct pam_message **message,
>		    struct pam_response **response)
>{
>	int retval;
>	struct pam_conv *conv;
>
>	retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv );
>	if (retval == PAM_SUCCESS) {
>		retval = conv->conv(nargs, (const struct pam_message **)message,
>				    response, conv->appdata_ptr);
>	}
>	
>	return retval; /* propagate error status */
>}
>
>
>static int _make_remark(pam_handle_t * pamh, int type, const char *text)
>{
>	int retval = PAM_SUCCESS;
>
>	struct pam_message *pmsg[1], msg[1];
>	struct pam_response *resp;
>	
>	pmsg[0] = &msg[0];
>	msg[0].msg = CONST_DISCARD(char *, text);
>	msg[0].msg_style = type;
>	
>	resp = NULL;
>	retval = converse(pamh, 1, pmsg, &resp);
>	
>	if (resp) {
>		_pam_drop_reply(resp, 1);
>	}
>	return retval;
>}
>
>static int _make_remark_format(pam_handle_t * pamh, int type, const char *format, ...)
>{
>	va_list args;
>	char *var;
>
>	va_start(args, format);
>	vasprintf(&var, format, args);
>	va_end(args);
>
>	return _make_remark(pamh, type, var);
>}
>
>static int pam_winbind_request(pam_handle_t * pamh, int ctrl,
>			       enum winbindd_cmd req_type,
>			       struct winbindd_request *request,
>			       struct winbindd_response *response)
>{
>	/* Fill in request and send down pipe */
>	init_request(request, req_type);
>	
>	if (write_sock(request, sizeof(*request), 0) == -1) {
>		_pam_log(LOG_ERR, "write to socket failed!");
>		close_sock();
>		return PAM_SERVICE_ERR;
>	}
>	
>	/* Wait for reply */
>	if (read_reply(response) == -1) {
>		_pam_log(LOG_ERR, "read from socket failed!");
>		close_sock();
>		return PAM_SERVICE_ERR;
>	}
>
>	/* We are done with the socket - close it and avoid mischeif */
>	close_sock();
>
>	/* Copy reply data from socket */
>	if (response->result != WINBINDD_OK) {
>		if (response->data.auth.pam_error != PAM_SUCCESS) {
>			_pam_log(LOG_ERR, "request failed: %s, PAM error was %s (%d), NT error was %s", 
>				 response->data.auth.error_string,
>				 pam_strerror(pamh, response->data.auth.pam_error),
>				 response->data.auth.pam_error,
>				 response->data.auth.nt_status_string);
>			return response->data.auth.pam_error;
>		} else {
>			_pam_log(LOG_ERR, "request failed, but PAM error 0!");
>			return PAM_SERVICE_ERR;
>		}
>	}
>
>	return PAM_SUCCESS;
>}
>
>static int pam_winbind_request_log(pam_handle_t * pamh, 
>				   int ctrl,
>				   enum winbindd_cmd req_type,
>				   struct winbindd_request *request,
>				   struct winbindd_response *response,
>				   const char *user)
>{
>	int retval;
>
>	retval = pam_winbind_request(pamh, ctrl, req_type, request, response);
>
>	switch (retval) {
>	case PAM_AUTH_ERR:
>		/* incorrect password */
>		_pam_log(LOG_WARNING, "user `%s' denied access (incorrect password or invalid membership)", user);
>		return retval;
>	case PAM_ACCT_EXPIRED:
>		/* account expired */
>		_pam_log(LOG_WARNING, "user `%s' account expired", user);
>		return retval;
>	case PAM_AUTHTOK_EXPIRED:
>		/* password expired */
>		_pam_log(LOG_WARNING, "user `%s' password expired", user);
>		return retval;
>	case PAM_NEW_AUTHTOK_REQD:
>		/* new password required */
>		_pam_log(LOG_WARNING, "user `%s' new password required", user);
>		return retval;
>	case PAM_USER_UNKNOWN:
>		/* the user does not exist */
>		_pam_log_debug(ctrl, LOG_NOTICE, "user `%s' not found", user);
>		if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
>			return PAM_IGNORE;
>		}	 
>		return retval;
>	case PAM_SUCCESS:
>		if (req_type == WINBINDD_PAM_AUTH) {
>			/* Otherwise, the authentication looked good */
>			_pam_log(LOG_NOTICE, "user '%s' granted access", user);
>		} else if (req_type == WINBINDD_PAM_CHAUTHTOK) {
>			/* Otherwise, the authentication looked good */
>			_pam_log(LOG_NOTICE, "user '%s' password changed", user);
>		} else { 
>			/* Otherwise, the authentication looked good */
>			_pam_log(LOG_NOTICE, "user '%s' OK", user);
>		}
>	
>		return retval;
>	default:
>		/* we don't know anything about this return value */
>		_pam_log(LOG_ERR, "internal module error (retval = %d, user = `%s')",
>			 retval, user);
>		return retval;
>	}
>}
>
>/* talk to winbindd */
>static int winbind_auth_request(pam_handle_t * pamh, 
>				int ctrl, 
>				const char *user, 
>				const char *pass, 
>				const char *member, 
>				const char *cctype,
>				int process_result,
>				time_t *pwd_last_set)
>{
>	struct winbindd_request request;
>	struct winbindd_response response;
>	int ret;
>
>	ZERO_STRUCT(request);
>	ZERO_STRUCT(response);
>
>	if (pwd_last_set) {
>		*pwd_last_set = 0;
>	}
>
>	strncpy(request.data.auth.user, user, 
>		sizeof(request.data.auth.user)-1);
>
>	strncpy(request.data.auth.pass, pass, 
>		sizeof(request.data.auth.pass)-1);
>
>	request.data.auth.krb5_cc_type[0] = '\0';
>	request.data.auth.uid = -1;
>	
>	request.flags = WBFLAG_PAM_INFO3_TEXT | WBFLAG_PAM_GET_PWD_POLICY;
>
>	if (ctrl & WINBIND_KRB5_AUTH) {
>
>		struct passwd *pwd = NULL;
>
>		_pam_log_debug(ctrl, LOG_DEBUG, "enabling krb5 login flag\n"); 
>
>		request.flags |= WBFLAG_PAM_KRB5 | WBFLAG_PAM_FALLBACK_AFTER_KRB5;
>
>		pwd = getpwnam(user);
>		if (pwd == NULL) {
>			return PAM_USER_UNKNOWN;
>		}
>		request.data.auth.uid = pwd->pw_uid;
>	}
>
>	if (ctrl & WINBIND_CACHED_LOGIN) {
>		_pam_log_debug(ctrl, LOG_DEBUG, "enabling cached login flag\n"); 
>		request.flags |= WBFLAG_PAM_CACHED_LOGIN;
>	}
>
>	if (cctype != NULL) {
>		strncpy(request.data.auth.krb5_cc_type, cctype, 
>			sizeof(request.data.auth.krb5_cc_type) - 1);
>		_pam_log_debug(ctrl, LOG_DEBUG, "enabling request for a %s krb5 ccache\n", cctype); 
>	}
>
>	request.data.auth.require_membership_of_sid[0] = '\0';
>
>	if (member != NULL) {
>		strncpy(request.data.auth.require_membership_of_sid, member, 
>		        sizeof(request.data.auth.require_membership_of_sid)-1);
>	}
>
>	/* lookup name? */ 
>	if ( (member != NULL) && (strncmp("S-", member, 2) != 0) ) {
>		
>		struct winbindd_request sid_request;
>		struct winbindd_response sid_response;
>
>		ZERO_STRUCT(sid_request);
>		ZERO_STRUCT(sid_response);
>
>		_pam_log_debug(ctrl, LOG_DEBUG, "no sid given, looking up: %s\n", member);
>
>		/* fortunatly winbindd can handle non-separated names */
>		strncpy(sid_request.data.name.name, member,
>			sizeof(sid_request.data.name.name) - 1);
>
>		if (pam_winbind_request_log(pamh, ctrl, WINBINDD_LOOKUPNAME, &sid_request, &sid_response, user)) {
>			_pam_log(LOG_INFO, "could not lookup name: %s\n", member); 
>			return PAM_AUTH_ERR;
>		}
>
>		member = sid_response.data.sid.sid;
>
>		strncpy(request.data.auth.require_membership_of_sid, member, 
>		        sizeof(request.data.auth.require_membership_of_sid)-1);
>	}
>	
>	ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_AUTH, &request, &response, user);
>
>	if (pwd_last_set) {
>		*pwd_last_set = response.data.auth.info3.pass_last_set_time;
>	}
>
>	if ((ctrl & WINBIND_KRB5_AUTH) && 
>	    response.data.auth.krb5ccname[0] != '\0') {
>
>		char var[PATH_MAX];
>
>		_pam_log_debug(ctrl, LOG_DEBUG, "request returned KRB5CCNAME: %s", 
>			       response.data.auth.krb5ccname);
>	
>		snprintf(var, sizeof(var), "KRB5CCNAME=%s", response.data.auth.krb5ccname);
>	
>		ret = pam_putenv(pamh, var);
>		if (ret != PAM_SUCCESS) {
>			_pam_log(LOG_ERR, "failed to set KRB5CCNAME to %s", var);
>			return ret;
>		}
>	}
>
>	if (!process_result) {
>		return ret;
>	}
>
>	if (ret) {
>		PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PASSWORD_EXPIRED");
>		PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PASSWORD_MUST_CHANGE");
>		PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_INVALID_WORKSTATION");
>		PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_INVALID_LOGON_HOURS");
>		PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_EXPIRED");
>		PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_DISABLED");
>		PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCOUNT_LOCKED_OUT");
>		PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT");
>		PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT");
>		PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT");
>	}
>
>	/* handle the case where the auth was ok, but the password must expire right now */
>	/* good catch from Ralf Haferkamp: an expiry of "never" is translated to -1 */
>	if ( ! (response.data.auth.info3.acct_flags & ACB_PWNOEXP) &&
>	    (response.data.auth.policy.expire > 0) && 
>	    (response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire < time(NULL))) {
>
>		ret = PAM_AUTHTOK_EXPIRED;
>
>		_pam_log_debug(ctrl, LOG_DEBUG,"Password has expired (Password was last set: %d, "
>			       "the policy says it should expire here %d (now it's: %d)\n",
>			       response.data.auth.info3.pass_last_set_time,
>			       response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire,
>			       time(NULL));
>
>		PAM_WB_REMARK_DIRECT_RET(pamh, "NT_STATUS_PASSWORD_EXPIRED");
>
>	}
>
>	/* warn a user if the password is about to expire soon */
>	if ( ! (response.data.auth.info3.acct_flags & ACB_PWNOEXP) &&
>	    (response.data.auth.policy.expire) && 
>	    (response.data.auth.info3.pass_last_set_time + response.data.auth.policy.expire > time(NULL) ) ) {
>
>		int days = response.data.auth.policy.expire / SECONDS_PER_DAY;
>		if (days <= DAYS_TO_WARN_BEFORE_PWD_EXPIRES) {
>			_make_remark_format(pamh, PAM_TEXT_INFO, "Your password will expire in %d days", days);
>		}
>	}
>
>	if (response.data.auth.info3.user_flgs & LOGON_CACHED_ACCOUNT) {
>		_make_remark(pamh, PAM_ERROR_MSG, "Logging on using cached account. Network ressources can be unavailable");
>		_pam_log_debug(ctrl, LOG_DEBUG,"User %s logged on using cached account\n", user);
>	}
>
>	/* save the CIFS homedir for pam_cifs / pam_mount */
>	if (response.data.auth.info3.home_dir[0] != '\0') {
>		char *buf;
>
>		if (!asprintf(&buf, "%s", response.data.auth.info3.home_dir)) {
>			return PAM_BUF_ERR;
>		}
>
>		pam_set_data( pamh, PAM_WINBIND_HOMEDIR, (void *)buf, _pam_winbind_cleanup_func);
>	}
>
>	return ret;
>}
>
>/* talk to winbindd */
>static int winbind_chauthtok_request(pam_handle_t * pamh,
>				     int ctrl,
>				     const char *user, 
>				     const char *oldpass,
>				     const char *newpass,
>				     time_t pwd_last_set) 
>{
>	struct winbindd_request request;
>	struct winbindd_response response;
>	int ret;
>
>	ZERO_STRUCT(request);
>	ZERO_STRUCT(response);
>
>	if (request.data.chauthtok.user == NULL) return -2;
>
>	strncpy(request.data.chauthtok.user, user, 
>		sizeof(request.data.chauthtok.user) - 1);
>
>	if (oldpass != NULL) {
>		strncpy(request.data.chauthtok.oldpass, oldpass, 
>			sizeof(request.data.chauthtok.oldpass) - 1);
>	} else {
>		request.data.chauthtok.oldpass[0] = '\0';
>	}
>	
>	if (newpass != NULL) {
>		strncpy(request.data.chauthtok.newpass, newpass, 
>			sizeof(request.data.chauthtok.newpass) - 1);
>	} else {
>		request.data.chauthtok.newpass[0] = '\0';
>	}
>
>	if (ctrl & WINBIND_KRB5_AUTH) {
>		request.flags = WBFLAG_PAM_KRB5;
>	}
>
>	ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_CHAUTHTOK, &request, &response, user);
>
>	if (ret == PAM_SUCCESS) {
>		return ret;
>	}
>
>	PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_BACKUP_CONTROLLER");
>	PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_ACCESS_DENIED");
>
>	/* TODO: tell the min pwd length ? */
>	PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_TOO_SHORT");
>
>	/* TODO: tell the minage ? */
>	PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_TOO_RECENT");
>
>	/* TODO: tell the history length ? */
>	PAM_WB_REMARK_CHECK_RESPONSE_RET(pamh, response, "NT_STATUS_PWD_HISTORY_CONFLICT");
>
>	if (!strcasecmp(response.data.auth.nt_status_string, "NT_STATUS_PASSWORD_RESTRICTION")) {
>
>		/* FIXME: avoid to send multiple PAM messages after another */
>		switch (response.data.auth.reject_reason) {
>			case -1:
>				break;
>			case REJECT_REASON_OTHER:
>				if ((response.data.auth.policy.min_passwordage > 0) &&
>				    (pwd_last_set + response.data.auth.policy.min_passwordage > time(NULL))) {
>					PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_TOO_RECENT");
>				}
>				break;
>			case REJECT_REASON_TOO_SHORT:
>				PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_TOO_SHORT");
>				break;
>			case REJECT_REASON_IN_HISTORY:
>				PAM_WB_REMARK_DIRECT(pamh, "NT_STATUS_PWD_HISTORY_CONFLICT");
>				break;
>			case REJECT_REASON_NOT_COMPLEX:
>				_make_remark(pamh, PAM_ERROR_MSG, "Password does not meet complexity requirements");
>				break;
>			default:
>				_pam_log_debug(ctrl, LOG_DEBUG,
>					       "unknown password change reject reason: %d", 
>					       response.data.auth.reject_reason);
>				break;
>		}
>
>		_make_remark_format(pamh, PAM_ERROR_MSG,  
>			"Your password must be at least %d characters; "
>			"cannot repeat any of the your previous %d passwords"
>			"%s. "
>			"Please type a different password. "
>			"Type a password which meets these requirements in both text boxes.",
>			response.data.auth.policy.min_length_password,
>			response.data.auth.policy.password_history,
>			(response.data.auth.policy.password_properties & DOMAIN_PASSWORD_COMPLEX) ? 
>				"; must contain capitals, numerals or punctuation; and cannot contain your account or full name" : 
>				"");
>
>	}
>
>	return ret;
>}
>
>/*
> * Checks if a user has an account
> *
> * return values:
> *	 1  = User not found
> *	 0  = OK
> * 	-1  = System error
> */
>static int valid_user(const char *user, pam_handle_t *pamh, int ctrl)
>{
>	/* check not only if the user is available over NSS calls, also make
>	 * sure it's really a winbind user, this is important when stacking PAM
>	 * modules in the 'account' or 'password' facility. */
>
>	struct passwd *pwd = NULL;
>	struct winbindd_request request;
>	struct winbindd_response response;
>	int ret;
>
>	ZERO_STRUCT(request);
>	ZERO_STRUCT(response);
>
>	pwd = getpwnam(user);
>	if (pwd == NULL) {
>		return 1;
>	}
>
>	strncpy(request.data.username, user,
>		sizeof(request.data.username) - 1);
>
>	ret = pam_winbind_request_log(pamh, ctrl, WINBINDD_GETPWNAM, &request, &response, user);
>
>	switch (ret) {
>		case PAM_USER_UNKNOWN:
>			return 1;
>		case PAM_SUCCESS:
>			return 0;
>		default:
>			break;
>	}
>	return -1;
>}
>
>static char *_pam_delete(register char *xx)
>{
>	_pam_overwrite(xx);
>	_pam_drop(xx);
>	return NULL;
>}
>
>/*
> * obtain a password from the user
> */
>
>static int _winbind_read_password(pam_handle_t * pamh,
>				  unsigned int ctrl,
>				  const char *comment,
>				  const char *prompt1,
>				  const char *prompt2,
>				  const char **pass)
>{
>	int authtok_flag;
>	int retval;
>	const char *item;
>	char *token;
>
>	/*
>	 * make sure nothing inappropriate gets returned
>	 */
>
>	*pass = token = NULL;
>
>	/*
>	 * which authentication token are we getting?
>	 */
>
>	authtok_flag = on(WINBIND__OLD_PASSWORD, ctrl) ? PAM_OLDAUTHTOK : PAM_AUTHTOK;
>
>	/*
>	 * should we obtain the password from a PAM item ?
>	 */
>
>	if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) || on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
>		retval = pam_get_item(pamh, authtok_flag, (const void **) &item);
>		if (retval != PAM_SUCCESS) {
>			/* very strange. */
>			_pam_log(LOG_ALERT, 
>				 "pam_get_item returned error to unix-read-password"
>			    );
>			return retval;
>		} else if (item != NULL) {	/* we have a password! */
>			*pass = item;
>			item = NULL;
>			return PAM_SUCCESS;
>		} else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
>			return PAM_AUTHTOK_RECOVER_ERR;		/* didn't work */
>		} else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
>			   && off(WINBIND__OLD_PASSWORD, ctrl)) {
>			return PAM_AUTHTOK_RECOVER_ERR;
>		}
>	}
>	/*
>	 * getting here implies we will have to get the password from the
>	 * user directly.
>	 */
>
>	{
>		struct pam_message msg[3], *pmsg[3];
>		struct pam_response *resp;
>		int i, replies;
>
>		/* prepare to converse */
>
>		if (comment != NULL) {
>			pmsg[0] = &msg[0];
>			msg[0].msg_style = PAM_TEXT_INFO;
>			msg[0].msg = CONST_DISCARD(char *, comment);
>			i = 1;
>		} else {
>			i = 0;
>		}
>
>		pmsg[i] = &msg[i];
>		msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
>		msg[i++].msg = CONST_DISCARD(char *, prompt1);
>		replies = 1;
>
>		if (prompt2 != NULL) {
>			pmsg[i] = &msg[i];
>			msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
>			msg[i++].msg = CONST_DISCARD(char *, prompt2);
>			++replies;
>		}
>		/* so call the conversation expecting i responses */
>		resp = NULL;
>		retval = converse(pamh, i, pmsg, &resp);
>
>		if (resp != NULL) {
>
>			/* interpret the response */
>
>			if (retval == PAM_SUCCESS) {	/* a good conversation */
>
>				token = x_strdup(resp[i - replies].resp);
>				if (token != NULL) {
>					if (replies == 2) {
>						/* verify that password entered correctly */
>						if (!resp[i - 1].resp
>						    || strcmp(token, resp[i - 1].resp)) {
>							_pam_delete(token);	/* mistyped */
>							retval = PAM_AUTHTOK_RECOVER_ERR;
>							_make_remark(pamh, PAM_ERROR_MSG, MISTYPED_PASS);
>						}
>					}
>				} else {
>					_pam_log(LOG_NOTICE
>						 ,"could not recover authentication token");
>				}
>
>			}
>			/*
>			 * tidy up the conversation (resp_retcode) is ignored
>			 * -- what is it for anyway? AGM
>			 */
>
>			_pam_drop_reply(resp, i);
>
>		} else {
>			retval = (retval == PAM_SUCCESS)
>			    ? PAM_AUTHTOK_RECOVER_ERR : retval;
>		}
>	}
>
>	if (retval != PAM_SUCCESS) {
>		_pam_log_debug(ctrl, LOG_DEBUG,
>			         "unable to obtain a password");
>		return retval;
>	}
>	/* 'token' is the entered password */
>
>	/* we store this password as an item */
>	
>	retval = pam_set_item(pamh, authtok_flag, token);
>	_pam_delete(token);	/* clean it up */
>	if (retval != PAM_SUCCESS || 
>	    (retval = pam_get_item(pamh, authtok_flag, (const void **) &item)) != PAM_SUCCESS) {
>		
>		_pam_log(LOG_CRIT, "error manipulating password");
>		return retval;
>		
>	}
>
>	*pass = item;
>	item = NULL;		/* break link to password */
>
>	return PAM_SUCCESS;
>}
>
>const char *get_conf_item_string(int argc, 
>				 const char **argv, 
>				 int ctrl,
>				 dictionary *d,
>				 const char *item, 
>				 int flag)
>{
>	int i = 0;
>	char *parm = NULL;
>	const char *parm_opt = NULL;
>	char *key = NULL;
>
>	if (!(ctrl & flag)) {
>		goto out;
>	}
>
>	/* let the pam opt take precedence over the pam_winbind.conf option */
>
>	if (d != NULL) {
>
>		if (!asprintf(&key, "global:%s", item)) {
>			goto out;
>		}
>
>		parm_opt = iniparser_getstr(d, key);
>		SAFE_FREE(key);
>	}
>
>	for ( i=0; i<argc; i++ ) {
>
>		if ((strncmp(argv[i], item, strlen(item)) == 0)) {
>			char *p;
>
>			parm = strdup(argv[i]);
>
>			if ( (p = strchr( parm, '=' )) == NULL) {
>				_pam_log(LOG_INFO, "no \"=\" delimiter for \"%s\" found\n", item);
>				goto out;
>			}
>			SAFE_FREE(parm);
>			_pam_log_debug(ctrl, LOG_INFO, "PAM config: %s '%s'\n", item, p+1);
>			return p + 1;
>		}
>	}
>
>	if (d != NULL) {
>		_pam_log_debug(ctrl, LOG_INFO, "CONFIG file: %s '%s'\n", item, parm_opt);
>	}
>out:
>	SAFE_FREE(parm);
>	return parm_opt;
>}
>
>const char *get_krb5_cc_type_from_config(int argc, const char **argv, int ctrl, dictionary *d)
>{
>	return get_conf_item_string(argc, argv, ctrl, d, "krb5_ccache_type", WINBIND_KRB5_CCACHE_TYPE);
>}
>
>const char *get_member_from_config(int argc, const char **argv, int ctrl, dictionary *d)
>{
>	const char *ret = NULL;
>	ret = get_conf_item_string(argc, argv, ctrl, d, "require_membership_of", WINBIND_REQUIRED_MEMBERSHIP);
>	if (ret) {
>		return ret;
>	}
>	return get_conf_item_string(argc, argv, ctrl, d, "require-membership-of", WINBIND_REQUIRED_MEMBERSHIP);
>}
>
>PAM_EXTERN
>int pam_sm_authenticate(pam_handle_t *pamh, int flags,
>			int argc, const char **argv)
>{
>	const char *username;
>	const char *password;
>	const char *member = NULL;
>	const char *cctype = NULL;
>	int retval = PAM_AUTH_ERR;
>	const dictionary *d;
>
>
>        _pam_log(LOG_INFO,"pam_winbind: pam_sm_authenticate,1 (flags: 0x%04x)", flags);
>
>	/* parse arguments */
>	int ctrl = _pam_parse(argc, argv, &d);
>	if (ctrl == -1) {
>	        _pam_log(LOG_INFO,"pam_winbind: _pam_parse error");
>		retval = PAM_SYSTEM_ERR;
>		goto out;
>	}
>
>	_pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_authenticate,2 (flags: 0x%04x)", flags);
>
>	/* Get the username */
>	retval = pam_get_user(pamh, &username, NULL);
>	if ((retval != PAM_SUCCESS) || (!username)) {
>		_pam_log(LOG_INFO,"pam_winbind: can not get the username");
>		_pam_log_debug(ctrl, LOG_DEBUG, "can not get the username");
>		retval = PAM_SERVICE_ERR;
>		goto out;
>	}
>
>	retval = _winbind_read_password(pamh, ctrl, NULL, 
>					"Password: ", NULL,
>					&password);
>
>	if (retval != PAM_SUCCESS) {
>                _pam_log(LOG_INFO,"pam_winbind: could not retreive user's password");
>		_pam_log(LOG_ERR, "Could not retrieve user's password");
>		retval = PAM_AUTHTOK_ERR;
>		goto out;
>	}
>
>	/* Let's not give too much away in the log file */
>
>#ifdef DEBUG_PASSWORD
>	_pam_log_debug(ctrl, LOG_INFO, "Verify user `%s' with password `%s'", 
>		       username, password);
>#else
>	_pam_log_debug(ctrl, LOG_INFO, "Verify user `%s'", username);
>#endif
>
>	member = get_member_from_config(argc, argv, ctrl, d);
>
>	cctype = get_krb5_cc_type_from_config(argc, argv, ctrl, d);
>
>	/* Now use the username to look up password */
>	retval = winbind_auth_request(pamh, ctrl, username, password, member, cctype, True, NULL);
>
>	if (retval == PAM_NEW_AUTHTOK_REQD ||
>	    retval == PAM_AUTHTOK_EXPIRED) {
>
>		char *buf;
>
>		if (!asprintf(&buf, "%d", retval)) {
>			retval = PAM_BUF_ERR;
>			goto out;
>		}
>
>		pam_set_data( pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, (void *)buf, _pam_winbind_cleanup_func);
>
>		retval = PAM_SUCCESS;
>		goto out;
>	}
>
>out:
>	if (d) {
>		iniparser_freedict(d);
>	}
>	return retval;
>}
>
>PAM_EXTERN
>int pam_sm_setcred(pam_handle_t *pamh, int flags,
>		   int argc, const char **argv)
>{
>	/* parse arguments */
>	int ctrl = _pam_parse(argc, argv, NULL);
>	if (ctrl == -1) {
>		return PAM_SYSTEM_ERR;
>	}
>
>	_pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_setcred (flags: 0x%04x)", flags);
>
>	if (flags & PAM_DELETE_CRED) {
>		return pam_sm_close_session(pamh, flags, argc, argv);
>	}
>
>	return PAM_SUCCESS;
>}
>
>/*
> * Account management. We want to verify that the account exists 
> * before returning PAM_SUCCESS
> */
>PAM_EXTERN
>int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
>		   int argc, const char **argv)
>{
>	const char *username;
>	int retval = PAM_USER_UNKNOWN;
>	void *tmp = NULL;
>
>	/* parse arguments */
>	int ctrl = _pam_parse(argc, argv, NULL);
>	if (ctrl == -1) {
>		return PAM_SYSTEM_ERR;
>	}
>
>	_pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_acct_mgmt (flags: 0x%04x)", flags);
>
>
>	/* Get the username */
>	retval = pam_get_user(pamh, &username, NULL);
>	if ((retval != PAM_SUCCESS) || (!username)) {
>		_pam_log_debug(ctrl, LOG_DEBUG,"can not get the username");
>		return PAM_SERVICE_ERR;
>	}
>
>	/* Verify the username */
>	retval = valid_user(username, pamh, ctrl);
>	switch (retval) {
>	case -1:
>		/* some sort of system error. The log was already printed */
>		return PAM_SERVICE_ERR;
>	case 1:
>		/* the user does not exist */
>		_pam_log_debug(ctrl, LOG_NOTICE, "user `%s' not found", username);
>		if (ctrl & WINBIND_UNKNOWN_OK_ARG) {
>			return PAM_IGNORE;
>		}
>		return PAM_USER_UNKNOWN;
>	case 0:
>		pam_get_data( pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, (const void **)&tmp);
>		if (tmp != NULL) {
>			retval = atoi(tmp);
>			switch (retval) {
>			case PAM_AUTHTOK_EXPIRED:
>				/* fall through, since new token is required in this case */
>			case PAM_NEW_AUTHTOK_REQD:
>				_pam_log(LOG_WARNING, "pam_sm_acct_mgmt success but %s is set", 
>					 PAM_WINBIND_NEW_AUTHTOK_REQD);
>				_pam_log(LOG_NOTICE, "user '%s' needs new password", username);
>				/* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
>				return PAM_NEW_AUTHTOK_REQD; 
>			default:
>				_pam_log(LOG_WARNING, "pam_sm_acct_mgmt success");
>				_pam_log(LOG_NOTICE, "user '%s' granted access", username);
>				return PAM_SUCCESS;
>			}
>		}
>
>		/* Otherwise, the authentication looked good */
>		_pam_log(LOG_NOTICE, "user '%s' granted access", username);
>		return PAM_SUCCESS;
>	default:
>		/* we don't know anything about this return value */
>		_pam_log(LOG_ERR, "internal module error (retval = %d, user = `%s')", 
>			 retval, username);
>		return PAM_SERVICE_ERR;
>	}
>
>	/* should not be reached */
>	return PAM_IGNORE;
>}
>
>PAM_EXTERN
>int pam_sm_open_session(pam_handle_t *pamh, int flags,
>			int argc, const char **argv)
>{
>	/* parse arguments */
>	int ctrl = _pam_parse(argc, argv, NULL);
>	if (ctrl == -1) {
>		return PAM_SYSTEM_ERR;
>	}
>
>	_pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_open_session handler (flags: 0x%04x)", flags);
>
>	return PAM_SUCCESS;
>}
>
>PAM_EXTERN
>int pam_sm_close_session(pam_handle_t *pamh, int flags,
>			 int argc, const char **argv)
>{
>	dictionary *d;
>	int retval = PAM_SUCCESS;
>
>	/* parse arguments */
>	int ctrl = _pam_parse(argc, argv, &d);
>	if (ctrl == -1) {
>		retval = PAM_SYSTEM_ERR;
>		goto out;
>	}
>
>	_pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_close_session handler (flags: 0x%04x)", flags);
>
>	if (!(flags & PAM_DELETE_CRED)) {
>		retval = PAM_SUCCESS;
>		goto out;
>	}
>
>	if (ctrl & WINBIND_KRB5_AUTH) {
>
>		/* destroy the ccache here */
>		struct winbindd_request request;
>		struct winbindd_response response;
>		const char *user;
>		const char *ccname = NULL;
>		struct passwd *pwd = NULL;
>
>		ZERO_STRUCT(request);
>		ZERO_STRUCT(response);
>
>		retval = pam_get_user(pamh, &user, "Username: ");
>		if (retval == PAM_SUCCESS) {
>			if (user == NULL) {
>				_pam_log(LOG_ERR, "username was NULL!");
>				retval = PAM_USER_UNKNOWN;
>				goto out;
>			}
>			if (retval == PAM_SUCCESS) {
>				_pam_log_debug(ctrl, LOG_DEBUG, "username [%s] obtained", user);
>			}
>		} else {
>			_pam_log_debug(ctrl, LOG_DEBUG, "could not identify user");
>			goto out;
>		}
>
>		ccname = pam_getenv(pamh, "KRB5CCNAME");
>		if (ccname == NULL) {
>			_pam_log_debug(ctrl, LOG_DEBUG, "user has no KRB5CCNAME environment");
>			retval = PAM_SUCCESS;
>			goto out;
>		}
>
>		strncpy(request.data.logoff.user, user,
>			sizeof(request.data.logoff.user) - 1);
>
>		strncpy(request.data.logoff.krb5ccname, ccname,
>			sizeof(request.data.logoff.krb5ccname) - 1);
>
>		pwd = getpwnam(user);
>		if (pwd == NULL) {
>			retval = PAM_USER_UNKNOWN;
>			goto out;
>		}
>		request.data.logoff.uid = pwd->pw_uid;
>
>		request.flags = WBFLAG_PAM_KRB5;
>
>	        retval = pam_winbind_request_log(pamh, ctrl, WINBINDD_PAM_LOGOFF, &request, &response, user);
>	}
>
>out:
>	if (d) {
>		iniparser_freedict(d);
>	}
>	return retval;
>}
>
>
>
>PAM_EXTERN 
>int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
>		     int argc, const char **argv)
>{
>	unsigned int lctrl;
>	int retval;
>	unsigned int ctrl;
>
>	/* <DO NOT free() THESE> */
>	const char *user;
>	char *pass_old, *pass_new;
>	/* </DO NOT free() THESE> */
>
>	char *Announce;
>	
>	int retry = 0;
>	dictionary *d;
>
>	ctrl = _pam_parse(argc, argv, &d);
>	if (ctrl == -1) {
>		retval = PAM_SYSTEM_ERR;
>		goto out;
>	}
>
>	_pam_log_debug(ctrl, LOG_DEBUG,"pam_winbind: pam_sm_chauthtok (flags: 0x%04x)", flags);
>
>	/* clearing offline bit for the auth in the password change */
>	ctrl &= ~WINBIND_CACHED_LOGIN;
>
>	/*
>	 * First get the name of a user
>	 */
>	retval = pam_get_user(pamh, &user, "Username: ");
>	if (retval == PAM_SUCCESS) {
>		if (user == NULL) {
>			_pam_log(LOG_ERR, "username was NULL!");
>			retval = PAM_USER_UNKNOWN;
>			goto out;
>		}
>		if (retval == PAM_SUCCESS) {
>			_pam_log_debug(ctrl, LOG_DEBUG, "username [%s] obtained",
>				 user);
>		}
>	} else {
>		_pam_log_debug(ctrl, LOG_DEBUG,
>			 "password - could not identify user");
>		goto out;
>	}
>
>	/* check if this is really a user in winbindd, not only in NSS */
>	retval = valid_user(user, pamh, ctrl);
>	switch (retval) {
>		case 1:
>			retval = PAM_USER_UNKNOWN;
>			goto out;
>		case -1:
>			retval = PAM_SYSTEM_ERR;
>			goto out;
>		default:
>			break;
>	}
>		
>	/*
>	 * obtain and verify the current password (OLDAUTHTOK) for
>	 * the user.
>	 */
>
>	if (flags & PAM_PRELIM_CHECK) {
>		
>		time_t pwdlastset_prelim = 0;
>		
>		/* instruct user what is happening */
>#define greeting "Changing password for "
>		Announce = (char *) malloc(sizeof(greeting) + strlen(user));
>		if (Announce == NULL) {
>			_pam_log(LOG_CRIT, "password - out of memory");
>			retval = PAM_BUF_ERR;
>			goto out;
>		}
>		(void) strcpy(Announce, greeting);
>		(void) strcpy(Announce + sizeof(greeting) - 1, user);
>#undef greeting
>		
>		lctrl = ctrl | WINBIND__OLD_PASSWORD;
>		retval = _winbind_read_password(pamh, lctrl,
>						Announce,
>						"(current) NT password: ",
>						NULL,
>						(const char **) &pass_old);
>		if (retval != PAM_SUCCESS) {
>			_pam_log(LOG_NOTICE, "password - (old) token not obtained");
>			goto out;
>		}
>		/* verify that this is the password for this user */
>		
>		retval = winbind_auth_request(pamh, ctrl, user, pass_old, NULL, NULL, False, &pwdlastset_prelim);
>
>		if (retval != PAM_ACCT_EXPIRED && 
>		    retval != PAM_AUTHTOK_EXPIRED &&
>		    retval != PAM_NEW_AUTHTOK_REQD &&
>		    retval != PAM_SUCCESS) {
>			pass_old = NULL;
>			goto out;
>		}
>		
>		pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET, (void *)pwdlastset_prelim, _pam_winbind_cleanup_func);
>
>		retval = pam_set_item(pamh, PAM_OLDAUTHTOK, (const void *) pass_old);
>		pass_old = NULL;
>		if (retval != PAM_SUCCESS) {
>			_pam_log(LOG_CRIT, "failed to set PAM_OLDAUTHTOK");
>		}
>	} else if (flags & PAM_UPDATE_AUTHTOK) {
>	
>		time_t pwdlastset_update = 0;
>		
>		/*
>		 * obtain the proposed password
>		 */
>		
>		/*
>		 * get the old token back. 
>		 */
>		
>		retval = pam_get_item(pamh, PAM_OLDAUTHTOK,
>				      (const void **) &pass_old);
>		
>		if (retval != PAM_SUCCESS) {
>			_pam_log(LOG_NOTICE, "user not authenticated");
>			goto out;
>		}
>		
>		lctrl = ctrl;
>		
>		if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
>			lctrl |= WINBIND_USE_FIRST_PASS_ARG;
>		}
>		retry = 0;
>		retval = PAM_AUTHTOK_ERR;
>		while ((retval != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
>			/*
>			 * use_authtok is to force the use of a previously entered
>			 * password -- needed for pluggable password strength checking
>			 */
>			
>			retval = _winbind_read_password(pamh, lctrl,
>							NULL,
>							"Enter new NT password: ",
>							"Retype new NT password: ",
>							(const char **) &pass_new);
>			
>			if (retval != PAM_SUCCESS) {
>				_pam_log_debug(ctrl, LOG_ALERT
>					 ,"password - new password not obtained");
>				pass_old = NULL;/* tidy up */
>				goto out;
>			}
>
>			/*
>			 * At this point we know who the user is and what they
>			 * propose as their new password. Verify that the new
>			 * password is acceptable.
>			 */
>			
>			if (pass_new[0] == '\0') {/* "\0" password = NULL */
>				pass_new = NULL;
>			}
>		}
>		
>		/*
>		 * By reaching here we have approved the passwords and must now
>		 * rebuild the password database file.
>		 */
>		pam_get_data( pamh, PAM_WINBIND_PWD_LAST_SET, (const void **)&pwdlastset_update);
>
>		retval = winbind_chauthtok_request(pamh, ctrl, user, pass_old, pass_new, pwdlastset_update);
>		if (retval) {
>			_pam_overwrite(pass_new);
>			_pam_overwrite(pass_old);
>			pass_old = pass_new = NULL;
>			goto out;
>		}
>
>		/* just in case we need krb5 creds after a password change over msrpc */
>
>		if (ctrl & WINBIND_KRB5_AUTH) {
>
>			const char *member = get_member_from_config(argc, argv, ctrl, d);
>			const char *cctype = get_krb5_cc_type_from_config(argc, argv, ctrl, d);
>
>			retval = winbind_auth_request(pamh, ctrl, user, pass_new, member, cctype, False, NULL);
>			_pam_overwrite(pass_new);
>			_pam_overwrite(pass_old);
>			pass_old = pass_new = NULL;
>		}
>	} else {
>		retval = PAM_SERVICE_ERR;
>	}
>
>out:
>	if (d) {
>		iniparser_freedict(d);
>	}
>	return retval;
>}
>
>#ifdef PAM_STATIC
>
>/* static module data */
>
>struct pam_module _pam_winbind_modstruct = {
>	MODULE_NAME,
>	pam_sm_authenticate,
>	pam_sm_setcred,
>	pam_sm_acct_mgmt,
>	pam_sm_open_session,
>	pam_sm_close_session,
>	pam_sm_chauthtok
>};
>
>#endif
>
>/*
> * Copyright (c) Andrew Tridgell  <tridge@samba.org>   2000
> * Copyright (c) Tim Potter       <tpot@samba.org>     2000
> * Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
> * Copyright (c) Guenther Deschner <gd@samba.org>      2005-2006
> * Copyright (c) Jan Rêkorajski 1999.
> * Copyright (c) Andrew G. Morgan 1996-8.
> * Copyright (c) Alex O. Yuriev, 1996.
> * Copyright (c) Cristian Gafton 1996.
> * Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software. 
> *
> * Redistribution and use in source and binary forms, with or without
> * modification, are permitted provided that the following conditions
> * are met:
> * 1. Redistributions of source code must retain the above copyright
> *    notice, and the entire permission notice in its entirety,
> *    including the disclaimer of warranties.
> * 2. Redistributions in binary form must reproduce the above copyright
> *    notice, this list of conditions and the following disclaimer in the
> *    documentation and/or other materials provided with the distribution.
> * 3. The name of the author may not be used to endorse or promote
> *    products derived from this software without specific prior
> *    written permission.
> *
> * ALTERNATIVELY, this product may be distributed under the terms of
> * the GNU Public License, in which case the provisions of the GPL are
> * required INSTEAD OF the above restrictions.  (This clause is
> * necessary due to a potential bad interaction between the GPL and
> * the restrictions contained in a BSD-style copyright.)
> *
> * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
> * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
> * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
> * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
> * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
> * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
> * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
> * OF THE POSSIBILITY OF SUCH DAMAGE.
> */

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