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source: branches/2.3/phpgwapi/inc/class.sessions.inc.php @ 4945

Revision 4945, 42.9 KB checked in by rafaelraymundo, 13 years ago (diff)
Ticket #2224 - Caracteres estranhos em e-mail originado do Outlook
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1	<?php
2	/**************************************************************************\
3	* eGroupWare API - Session management *
4	* This file written by Dan Kuykendall <seek3r@phpgroupware.org> *
5	* and Joseph Engo <jengo@phpgroupware.org> *
6	* and Ralf Becker <ralfbecker@outdoor-training.de> *
7	* Copyright (C) 2000, 2001 Dan Kuykendall *
8	* Parts Copyright (C) 2003 Free Software Foundation Inc *
9	* -------------------------------------------------------------------------*
10	* This library is part of the eGroupWare API *
11	* http://www.egroupware.org/api *
12	* ------------------------------------------------------------------------ *
13	* This library is free software; you can redistribute it and/or modify it *
14	* under the terms of the GNU Lesser General Public License as published by *
15	* the Free Software Foundation; either version 2.1 of the License, *
16	* or any later version. *
17	* This library is distributed in the hope that it will be useful, but *
18	* WITHOUT ANY WARRANTY; without even the implied warranty of *
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
20	* See the GNU Lesser General Public License for more details. *
21	* You should have received a copy of the GNU Lesser General Public License *
22	* along with this library; if not, write to the Free Software Foundation, *
23	* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
24	\**************************************************************************/
25
26
27	/* sessions_type setup moved after the class below - milosch */
28
29	/**
30	* Session Management Libabray
31	*
32	* This allows eGroupWare to use php4 or database sessions
33	*
34	* @package phpgwapi
35	* @subpackage sessions
36	* @abstract
37	* @author NetUSE AG Boris Erdmann, Kristian Koehntopp <br> hacked on by phpGW
38	* @copyright © 1998-2000 NetUSE AG Boris Erdmann, Kristian Koehntopp <br> © 2003 FreeSoftware Foundation
39	* @license LGPL
40	* @link http://www.sanisoft.com/phplib/manual/DB_sql.php
41	* @uses db
42	*/
43
44	class sessions_
45	{
46	/**
47	* @var string current user login
48	*/
49	var $login;
50
51	/**
52	* @var string current user password
53	*/
54	var $passwd;
55	/**
56	* @var string current user certificate, if present
57	*/
58	var $certificate;
59	/**
60	* @var int current user db/ldap account id
61	*/
62	var $account_id;
63
64	/**
65	* @var string current user account login id - ie user@domain
66	*/
67	var $account_lid;
68
69	/**
70	* @var string previous page call id - repost prevention
71	*/
72	var $history_id;
73
74	/**
75	* @var string domain for current user
76	*/
77	var $account_domain;
78
79	/**
80	* @var session type flag, A - anonymous session, N - None, normal session
81	*/
82	var $session_flags;
83
84	/**
85	* @var string current user session id
86	*/
87	var $sessionid;
88
89	/**
90	* @var string not sure what this does, but it is important :)
91	*/
92	var $kp3;
93
94	/**
95	* @var string encryption key?
96	*/
97	var $key;
98
99	/**
100	* @var string iv == ivegotnoidea ;) (skwashd)
101	*/
102	var $iv;
103
104	/**
105	* @var session data
106	*/
107	var $data;
108
109	/**
110	* @var object holder for the database object
111	*/
112	var $db;
113
114	/**
115	* @var array publicly available methods
116	*/
117	var $public_functions = array(
118	'list_methods' => True,
119	'update_dla' => True,
120	'list' => True,
121	'total' => True
122	);
123
124	/**
125	* @var string domain for cookies
126	*/
127	var $cookie_domain;
128
129	/**
130	* @var name of XML-RPC/SOAP method called
131	*/
132	var $xmlrpc_method_called;
133
134	/**
135	* Constructor just loads up some defaults from cookies
136	*/
137	function sessions_()
138	{
139	$this->db = $GLOBALS['phpgw']->db;
140	$this->sessionid = get_var('sessionid',array('GET','COOKIE'));
141	$this->kp3 = get_var('kp3',array('GET','COOKIE'));
142	/* Create the crypto object */
143	$GLOBALS['phpgw']->crypto = CreateObject('phpgwapi.crypto');
144	if ($GLOBALS['phpgw_info']['server']['usecookies'])
145	{
146	$this->phpgw_set_cookiedomain();
147	}
148	// verfiy and if necessary create and save our config settings
149	//
150	$save_rep = False;
151	if (!isset($GLOBALS['phpgw_info']['server']['max_access_log_age']))
152	{
153	$GLOBALS['phpgw_info']['server']['max_access_log_age'] = 90; // default 90 days
154	$save_rep = True;
155	}
156	if (!isset($GLOBALS['phpgw_info']['server']['block_time']))
157	{
158	$GLOBALS['phpgw_info']['server']['block_time'] = 30; // default 30min
159	$save_rep = True;
160	}
161	if (!isset($GLOBALS['phpgw_info']['server']['num_unsuccessful_id']))
162	{
163	$GLOBALS['phpgw_info']['server']['num_unsuccessful_id'] = 3; // default 3 trys per id
164	$save_rep = True;
165	}
166	if (!isset($GLOBALS['phpgw_info']['server']['num_unsuccessful_ip']))
167	{
168	$GLOBALS['phpgw_info']['server']['num_unsuccessful_ip'] = $GLOBALS['phpgw_info']['server']['num_unsuccessful_id']; // default same as for id
169	$save_rep = True;
170	}
171	if (!isset($GLOBALS['phpgw_info']['server']['install_id']))
172	{
173	$GLOBALS['phpgw_info']['server']['install_id'] = md5($GLOBALS['phpgw']->common->randomstring(15));
174	$save_rep = True;
175	}
176	if (!isset($GLOBALS['phpgw_info']['server']['sessions_timeout']))
177	{
178	$GLOBALS['phpgw_info']['server']['sessions_timeout'] = 14400;
179	$save_rep = True;
180	}
181	if (!isset($GLOBALS['phpgw_info']['server']['sessions_app_timeout']))
182	{
183	$GLOBALS['phpgw_info']['server']['sessions_app_timeout'] = 86400;
184	$save_rep = True;
185	}
186	if (!isset($GLOBALS['phpgw_info']['server']['max_history']))
187	{
188	$GLOBALS['phpgw_info']['server']['max_history'] = 20;
189	$save_rep = True;
190	}
191
192	// jakjr: ? usando o hardcode, para evitar sempre 2 chamadas ao banco.
193	/*
194	if ($save_rep)
195	{
196	$config = CreateObject('phpgwapi.config','phpgwapi');
197	$config->read_repository();
198	$config->value('max_access_log_age',$GLOBALS['phpgw_info']['server']['max_access_log_age']);
199	$config->value('block_time',$GLOBALS['phpgw_info']['server']['block_time']);
200	$config->value('num_unsuccessful_id',$GLOBALS['phpgw_info']['server']['num_unsuccessful_id']);
201	$config->value('num_unsuccessful_ip',$GLOBALS['phpgw_info']['server']['num_unsuccessful_ip']);
202	$config->value('install_id',$GLOBALS['phpgw_info']['server']['install_id']);
203	$config->value('sessions_timeout',$GLOBALS['phpgw_info']['server']['sessions_timeout']);
204	$config->value('sessions_app_timeout',$GLOBALS['phpgw_info']['server']['sessions_app_timeout']);
205	$config->save_repository();
206	unset($config);
207	}*/
208	}
209
210	/**
211	* Introspection for XML-RPC/SOAP
212	* Diabled - why??
213	*
214	* @param string $_type tpye of introspection being sought
215	* @return array available methods and args
216	*/
217	function DONTlist_methods($_type)
218	{
219	if (is_array($_type))
220	{
221	$_type = $_type['type'];
222	}
223
224	switch($_type)
225	{
226	case 'xmlrpc':
227	$xml_functions = array(
228	'list_methods' => array(
229	'function' => 'list_methods',
230	'signature' => array(array(xmlrpcStruct,xmlrpcString)),
231	'docstring' => lang('Read this list of methods.')
232	),
233	'update_dla' => array(
234	'function' => 'update_dla',
235	'signature' => array(array(xmlrpcBoolean)),
236	'docstring' => lang('Returns an array of todo items')
237	)
238	);
239	return $xml_functions;
240	break;
241	case 'soap':
242	return $this->soap_functions;
243	break;
244	default:
245	return array();
246	break;
247	}
248	}
249
250	function split_login_domain($both,&$login,&$domain)
251	{
252	$parts = explode('@',$both);
253	$domain = count($parts) > 1 ? array_pop($parts) :
254	$GLOBALS['phpgw_info']['server']['default_domain'];
255	$login = implode('@',$parts);
256	}
257
258	/**
259	* Check to see if a session is still current and valid
260	*
261	* @param string $sessionid session id to be verfied
262	* @param string $kp3 ?? to be verified
263	* @return bool is the session valid?
264	*/
265	function verify($sessionid='',$kp3='')
266	{
267	if(empty($sessionid) \|\| !$sessionid)
268	{
269	$sessionid = get_var('sessionid',array('GET','COOKIE'));
270	$kp3 = get_var('kp3',array('GET','COOKIE'));
271	}
272
273	$this->sessionid = $sessionid;
274	$this->kp3 = $kp3;
275
276	$session = $this->read_session();
277	//echo "<pre>session::verify(id='$sessionid'): \n".print_r($session,True)."</pre>\n";
278	/*
279	$fp = fopen('/tmp/session_verify','a+');
280	fwrite($fp,"session::verify(id='$sessionid'): \n".print_r($session,True)."\n\n");
281	fclose($fp);
282	*/
283	if ($session['session_dla'] <= (time() - $GLOBALS['phpgw_info']['server']['sessions_timeout']))
284	{
285	$this->destroy($sessionid,$kp3);
286	return False;
287	}
288
289	$this->session_flags = $session['session_flags'];
290
291	sessions_::split_login_domain($session['session_lid'],$this->account_lid,$this->account_domain);
292
293	$GLOBALS['phpgw_info']['user']['kp3'] = $this->kp3;
294
295	$this->update_dla();
296	if (isset($_SESSION['phpgw_session']['account_id']))
297	$this->account_id = $_SESSION['phpgw_session']['account_id'];
298	else
299	$this->account_id = $GLOBALS['phpgw']->accounts->name2id($this->account_lid);
300	if (!$this->account_id)
301	{
302	return False;
303	}
304	$GLOBALS['phpgw_info']['user']['account_id'] = $this->account_id;
305	$_SESSION['phpgw_session']['account_id'] = $this->account_id;
306
307	/* init the crypto object before appsession call below */
308	$this->key = md5($this->kp3 . $this->sessionid . @$GLOBALS['phpgw_info']['server']['encryptkey']);
309	$this->iv = $GLOBALS['phpgw_info']['server']['mcrypt_iv'];
310	$GLOBALS['phpgw']->crypto->init(array($this->key,$this->iv));
311
312	$this->read_repositories(@$GLOBALS['phpgw_info']['server']['cache_phpgw_info']);
313	if (strlen($this->user['expires']) == 0)
314	$this->user['expires'] = $_SESSION['phpgw_session']['expires_account'];
315	if ($this->user['expires'] != -1 && $this->user['expires'] < time())
316	{
317	if(is_object($GLOBALS['phpgw']->log))
318	{
319	$GLOBALS['phpgw']->log->message(array(
320	'text' => 'W-VerifySession, account loginid %1 is expired',
321	'p1' => $this->account_lid,
322	'line' => __LINE__,
323	'file' => __FILE__
324	));
325	$GLOBALS['phpgw']->log->commit();
326	}
327	return False;
328	}
329	$_SESSION['phpgw_session']['expires_account'] = $this->user['expires'];
330
331
332	$GLOBALS['phpgw_info']['user'] = $this->user;
333	$GLOBALS['phpgw_info']['hooks'] = $this->hooks;
334
335	$GLOBALS['phpgw_info']['user']['session_ip'] = $session['session_ip'];
336	$GLOBALS['phpgw_info']['user']['passwd'] = base64_decode($this->appsession('password','phpgwapi'));
337
338	if ($this->account_domain != $GLOBALS['phpgw_info']['user']['domain'])
339	{
340	if(is_object($GLOBALS['phpgw']->log))
341	{
342	$GLOBALS['phpgw']->log->message(array(
343	'text' => 'W-VerifySession, the domains %1 and %2 don\'t match',
344	'p1' => $userid_array[1],
345	'p2' => $GLOBALS['phpgw_info']['user']['domain'],
346	'line' => __LINE__,
347	'file' => __FILE__
348	));
349	$GLOBALS['phpgw']->log->commit();
350	}
351	return False;
352	}
353
354
355	$GLOBALS['phpgw']->acl->acl($this->account_id);
356	$GLOBALS['phpgw']->accounts->accounts($this->account_id);
357	$GLOBALS['phpgw']->preferences->preferences($this->account_id);
358	$GLOBALS['phpgw']->applications->applications($this->account_id);
359
360	if (! $this->account_lid)
361	{
362	if(is_object($GLOBALS['phpgw']->log))
363	{
364	// This needs some better wording
365	$GLOBALS['phpgw']->log->message(array(
366	'text' => 'W-VerifySession, account_id is empty',
367	'line' => __LINE__,
368	'file' => __FILE__
369	));
370	$GLOBALS['phpgw']->log->commit();
371	}
372	//echo 'DEBUG: Sessions: account_id is empty!<br>'."\n";
373	return False;
374	}
375	return True;
376	}
377
378	/**
379	* Functions for creating and verifying the session
380	*/
381
382	/**
383	* Get the ip address of current users
384	*
385	* @return string ip address
386	*/
387	function getuser_ip()
388	{
389	$ip = (isset($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR']."," : "").$_SERVER['REMOTE_ADDR'];
390	if(strlen($ip)>30) {
391	$ip_exploded = explode(",",$ip);
392	$ip = "";
393	for($i=0;$i<2;$i++)
394	$ip .= isset($ip_exploded[$i])?(($i==1?",":"").trim($ip_exploded[$i])):("");
395	if(strlen($ip)>30)
396	$ip = $ip_exploded[0];
397	}
398
399	return $ip;
400	}
401
402	/**
403	* Set the domain used for cookies
404	*
405	* @return string domain
406	*/
407	function phpgw_set_cookiedomain()
408	{
409	// Use HTTP_X_FORWARDED_HOST if set, which is the case behind a none-transparent proxy
410	//$this->cookie_domain = isset($_SERVER['HTTP_X_FORWARDED_HOST']) ? $_SERVER['HTTP_X_FORWARDED_HOST'] : $_SERVER['HTTP_HOST'];
411	//Modificacao feita para que o Expresso redirecione para o primeiro proxy caso haja um encadeamento de mais de um proxy.
412	$this->cookie_domain = nearest_to_me();
413
414	// remove port from HTTP_HOST
415	if (preg_match("/^(.):(.)$/",$this->cookie_domain,$arr))
416	{
417	$this->cookie_domain = $arr[1];
418	}
419	if (count(explode('.',$this->cookie_domain)) <= 1)
420	{
421	// setcookie dont likes domains without dots, leaving it empty, gets setcookie to fill the domain in
422	$this->cookie_domain = '';
423	}
424	print_debug('COOKIE_DOMAIN',$this->cookie_domain,'api');
425
426	$this->set_cookie_params($this->cookie_domain); // for php4 sessions necessary
427	}
428
429	/**
430	* Set a cookie
431	*
432	* @param string $cookiename name of cookie to be set
433	* @param string $cookievalue value to be used, if unset cookie is cleared (optional)
434	* @param int $cookietime when cookie should expire, 0 for session only (optional)
435	*/
436	function phpgw_setcookie($cookiename,$cookievalue='',$cookietime=0)
437	{
438	if (!$this->cookie_domain)
439	{
440	$this->phpgw_set_cookiedomain();
441	}
442	setcookie($cookiename,$cookievalue,$cookietime,'/',$this->cookie_domain,null,true);
443	}
444
445	/**
446	* Create a new session
447	*
448	* @param string $login user login
449	* @param string $passwd user password
450	* @param string $passwd_type type of password being used, ie plaintext, md5, sha1
451	* @return string session id
452	*/
453	function create($login,$passwd = '',$passwd_type = '')
454	{
455	if (is_array($login))
456	{
457	$this->login = $login['login'];
458	$this->passwd = $login['passwd'];
459	$this->passwd_type = $login['passwd_type'];
460	$login = $this->login;
461	}
462	else
463	{
464	$this->login = $login;
465	$this->passwd = $passwd;
466	$this->passwd_type = $passwd_type;
467	}
468	if($_SESSION['login_certificate'])
469	{
470	$this->certificate = $_SESSION['login_certificate'];
471	}
472	else
473	{
474	$this->certificate = false;
475	}
476	$this->clean_sessions();
477	//sessions_::split_login_domain($login,$this->account_lid,$this->account_domain);
478	// jakjr: allow uid with (@);
479	$this->account_lid = $login;
480	$this->account_domain = 'default';
481
482	$now = time();
483
484	//echo "<p>session::create(login='$login'): lid='$this->account_lid', domain='$this->account_domain'</p>\n";
485	$user_ip = $this->getuser_ip();
486
487	$this->account_id = $GLOBALS['phpgw']->accounts->name2id($this->account_lid);
488
489	if (($blocked = $this->login_blocked($login,$user_ip)) \|\| // too many unsuccessful attempts
490	$GLOBALS['phpgw_info']['server']['global_denied_users'][$this->account_lid] \|\|
491	!$GLOBALS['phpgw']->auth->authenticate($this->account_lid, $this->passwd, $this->passwd_type) \|\|
492	$this->account_id && $GLOBALS['phpgw']->accounts->get_type($this->account_id) == 'g')
493	{
494	$this->reason = $blocked ? 'blocked, too many attempts' : 'bad login or password';
495	$this->cd_reason = $blocked ? 99 : 5;
496
497	$this->log_access($this->reason,$login,$user_ip,0); // log unsuccessfull login
498	return False;
499	}
500	// Só verifica tempo de inatividade do usuário, caso esteja configurado no Administrador.
501	if(isset($GLOBALS['phpgw_info']['server']['time_to_account_expires']) &&
502	$this->account_id !=null && $this->account_lid != "expresso-admin") {
503	$last_access = $this->get_last_access_on_history($this->account_id);
504	$this->read_repositories(False);
505	if ($last_access && ($last_access+($GLOBALS['phpgw_info']['server']['time_to_account_expires']*86400) < time()))
506	{
507	if(is_object($GLOBALS['phpgw']->log))
508	{
509	$GLOBALS['phpgw']->log->message(array(
510	'text' => 'W-LoginFailure, account loginid %1 is expired for innativity',
511	'p1' => $this->account_lid,
512	'line' => __LINE__,
513	'file' => __FILE__
514	));
515	$GLOBALS['phpgw']->log->commit();
516	}
517	$this->reason = 'account is expired';
518	$this->cd_reason = 98;
519
520	return False;
521	}
522	}
523
524	/* jakjr: Expresso does not use auto-create account.
525	if (!$this->account_id && $GLOBALS['phpgw_info']['server']['auto_create_acct'] == True)
526	{
527	$this->account_id = $GLOBALS['phpgw']->accounts->auto_add($this->account_lid, $passwd);
528	}
529	*/
530
531	$GLOBALS['phpgw_info']['user']['account_id'] = $this->account_id;
532	$GLOBALS['phpgw']->accounts->accounts($this->account_id);
533	$this->sessionid = $this->new_session_id();
534	$this->kp3 = md5($GLOBALS['phpgw']->common->randomstring(15));
535
536	if ($GLOBALS['phpgw_info']['server']['usecookies'])
537	{
538	$this->phpgw_setcookie('sessionid',$this->sessionid);
539	$this->phpgw_setcookie('kp3',$this->kp3);
540	$this->phpgw_setcookie('domain',$this->account_domain);
541	}
542	if ($GLOBALS['phpgw_info']['server']['usecookies'] \|\| isset($_COOKIE['last_loginid']))
543	{
544	$this->phpgw_setcookie('last_loginid', $this->account_lid ,$now+1209600); /* For 2 weeks */
545	$this->phpgw_setcookie('last_domain',$this->account_domain,$now+1209600);
546	$this->phpgw_setcookie('last_organization',$_POST['organization'],$now+1209600);
547	}
548	unset($GLOBALS['phpgw_info']['server']['default_domain']); /* we kill this for security reasons */
549
550	/* init the crypto object */
551	$this->key = md5($this->kp3 . $this->sessionid . $GLOBALS['phpgw_info']['server']['encryptkey']);
552	$this->iv = $GLOBALS['phpgw_info']['server']['mcrypt_iv'];
553	$GLOBALS['phpgw']->crypto->init(array($this->key,$this->iv));
554
555	$this->read_repositories(False);
556	if ($this->user['expires'] != -1 && $this->user['expires'] < time())
557	{
558	if(is_object($GLOBALS['phpgw']->log))
559	{
560	$GLOBALS['phpgw']->log->message(array(
561	'text' => 'W-LoginFailure, account loginid %1 is expired',
562	'p1' => $this->account_lid,
563	'line' => __LINE__,
564	'file' => __FILE__
565	));
566	$GLOBALS['phpgw']->log->commit();
567	}
568	$this->reason = 'account is expired';
569	$this->cd_reason = 98;
570
571	return False;
572	}
573	$GLOBALS['phpgw_info']['user'] = $this->user;
574	$GLOBALS['phpgw_info']['hooks'] = $this->hooks;
575
576	$this->appsession('password','phpgwapi',base64_encode($this->passwd));
577	$this->appsession('browser_agent','phpgwapi',$GLOBALS['browser']->BROWSER_AGENT);
578	if($this->certificate) $this->appsession('certificate','phpgwapi',$this->certificate);
579	if ($GLOBALS['phpgw']->acl->check('anonymous',1,'phpgwapi'))
580	{
581	$session_flags = 'A';
582	}
583	else
584	{
585	$session_flags = 'N';
586	}
587
588	$GLOBALS['phpgw']->db->transaction_begin();
589	$this->register_session($login,$user_ip,$now,$session_flags);
590	if ($session_flags != 'A') // dont log anonymous sessions
591	{
592	$this->log_access($this->sessionid,$login,$user_ip,$this->account_id);
593	}
594	$this->appsession('account_previous_login','phpgwapi',$GLOBALS['phpgw']->auth->previous_login);
595	// Expresso
596	//$GLOBALS['phpgw']->auth->update_lastlogin($this->account_id,$user_ip);
597	$GLOBALS['phpgw']->db->transaction_commit();
598
599	//if (!$this->sessionid) echo "<p>session::create(login='$login') = '$this->sessionid': lid='$this->account_lid', domain='$this->account_domain'</p>\n";
600
601	return $this->sessionid;
602	}
603
604	/**
605	* Retorna o UNIX DATE do ultimo acesso dessa conta, baseado na tabela de histórico.
606	*/
607	function get_last_access_on_history($account_id) {
608	$GLOBALS['phpgw']->db->query("select li from phpgw_access_log where account_id='$account_id' order by li desc limit 1",__LINE__,__FILE__);
609	if(!$GLOBALS['phpgw']->db->next_record())
610	return false;
611	return $GLOBALS['phpgw']->db->f('li');
612	}
613
614	/**
615	* Write or update (for logout) the access_log
616	*
617	* @param string $sessionid id of session or 0 for unsuccessful logins
618	* @param string $login account_lid (evtl. with domain) or '' for settion the logout-time
619	* @param string $user_ip ip to log
620	* @param int $account_id numerical account_id
621	*/
622	function log_access($sessionid,$login='',$user_ip='',$account_id='')
623	{
624	$now = time();
625
626	if ($login != '')
627	{
628	if (strlen($login) > 30)
629	{
630	$login = substr($login,0,30);
631	}
632	$GLOBALS['phpgw']->db->query('INSERT INTO phpgw_access_log(sessionid,loginid,ip,li,lo,account_id,browser)'
633	. " VALUES ('" . $sessionid . "','" . $this->db->db_addslashes($login). "','"
634	. $this->db->db_addslashes($user_ip) . "',$now,0," . (int)$account_id .",'".$this->db->db_addslashes(substr($_SERVER[ 'HTTP_USER_AGENT' ],0,199))."')",__LINE__,__FILE__);
635	}
636	else if($sessionid != 'bad login or password')
637	{
638	$GLOBALS['phpgw']->db->query("UPDATE phpgw_access_log SET lo=" . $now . " WHERE sessionid='"
639	. $sessionid . "'",__LINE__,__FILE__);
640	}
641
642	/* jakjr: Clean phpgw_access_log with a crontab event.
643	if ($GLOBALS['phpgw_info']['server']['max_access_log_age'])
644	{
645	$max_age = $now - $GLOBALS['phpgw_info']['server']['max_access_log_age'] * 24 * 60 * 60;
646
647	$GLOBALS['phpgw']->db->query("DELETE FROM phpgw_access_log WHERE li < $max_age");
648	}
649	*/
650	}
651
652	/**
653	* Protect against brute force attacks, block login if too many unsuccessful login attmepts
654	*
655	* @param string $login account_lid (evtl. with domain)
656	* @param string $ip ip of the user
657	* @returns bool login blocked?
658	*/
659	function login_blocked($login,$ip)
660	{
661	/jakjr: Disable this protection. When block an proxy server ip, all the sub-network will be blocking./
662	//return false; //
663
664	$blocked = False;
665	$block_time = time() - $GLOBALS['phpgw_info']['server']['block_time'] * 60;
666	/*
667	$ip = $this->db->db_addslashes($ip);
668	$this->db->query("SELECT count(*) FROM phpgw_access_log WHERE account_id=0 AND ip='$ip' AND li > $block_time",__LINE__,__FILE__);
669	$this->db->next_record();
670	if (($false_ip = $this->db->f(0)) > $GLOBALS['phpgw_info']['server']['num_unsuccessful_ip'])
671	{
672	//echo "<p>login_blocked: ip='$ip' ".$this->db->f(0)." trys (".$GLOBALS['phpgw_info']['server']['num_unsuccessful_ip']." max.) since ".date('Y/m/d H:i',$block_time)."</p>\n";
673	$blocked = True;
674	}
675	*/
676	$login = $this->db->db_addslashes($login);
677	$this->db->query("SELECT count(*) FROM phpgw_access_log WHERE account_id=0 AND (loginid='$login' OR loginid LIKE '$login@%') AND li > $block_time",__LINE__,__FILE__);
678	$this->db->next_record();
679	if (($false_id = $this->db->f(0)) > $GLOBALS['phpgw_info']['server']['num_unsuccessful_id'])
680	{
681	//echo "<p>login_blocked: login='$login' ".$this->db->f(0)." trys (".$GLOBALS['phpgw_info']['server']['num_unsuccessful_id']." max.) since ".date('Y/m/d H:i',$block_time)."</p>\n";
682	$blocked = True;
683	}
684	if ($blocked && $GLOBALS['phpgw_info']['server']['admin_mails'] &&
685	// max. one mail each 5mins
686	$GLOBALS['phpgw_info']['server']['login_blocked_mail_time'] < time()-5*60)
687	{
688	// notify admin(s) via email
689	$from = 'eGroupWare@'.$GLOBALS['phpgw_info']['server']['mail_suffix'];
690	$subject = lang("eGroupWare: login blocked for user '%1', IP %2",$login,$ip);
691	$body = lang("Too many unsucessful attempts to login: %1 for the user '%2', %3 for the IP %4",$false_id,$login,$false_ip,$ip);
692
693	if(!is_object($GLOBALS['phpgw']->send))
694	{
695	$GLOBALS['phpgw']->send = CreateObject('phpgwapi.send');
696	}
697	$subject = $GLOBALS['phpgw']->send->encode_subject($subject);
698	$admin_mails = explode(',',$GLOBALS['phpgw_info']['server']['admin_mails']);
699	foreach($admin_mails as $to)
700	{
701	$GLOBALS['phpgw']->send->msg('email',$to,$subject,$body,'','','',$from,$from);
702	}
703	// save time of mail, to not send to many mails
704	$config = CreateObject('phpgwapi.config','phpgwapi');
705	$config->read_repository();
706	$config->value('login_blocked_mail_time',time());
707	$config->save_repository();
708	}
709	return $blocked;
710	}
711
712	/**
713	* Verfy a peer server access request
714	*
715	* @param string $sessionid session id to verfiy
716	* @param string $kp3 ??
717	* @return bool verfied?
718	*/
719	function verify_server($sessionid, $kp3)
720	{
721	$GLOBALS['phpgw']->interserver = CreateObject('phpgwapi.interserver');
722	$this->sessionid = $sessionid;
723	$this->kp3 = $kp3;
724
725	$session = $this->read_session();
726	$this->session_flags = $session['session_flags'];
727
728	list($this->account_lid,$this->account_domain) = explode('@', $session['session_lid']);
729
730	if ($this->account_domain == '')
731	{
732	$this->account_domain = $GLOBALS['phpgw_info']['server']['default_domain'];
733	}
734
735	$GLOBALS['phpgw_info']['user']['kp3'] = $this->kp3;
736	$phpgw_info_flags = $GLOBALS['phpgw_info']['flags'];
737
738	$GLOBALS['phpgw_info']['flags'] = $phpgw_info_flags;
739
740	$this->update_dla();
741	$this->account_id = $GLOBALS['phpgw']->interserver->name2id($this->account_lid);
742
743	if (!$this->account_id)
744	{
745	return False;
746	}
747
748	$GLOBALS['phpgw_info']['user']['account_id'] = $this->account_id;
749
750	$this->read_repositories(@$GLOBALS['phpgw_info']['server']['cache_phpgw_info']);
751
752	/* init the crypto object before appsession call below */
753	$this->key = md5($this->kp3 . $this->sessionid . $GLOBALS['phpgw_info']['server']['encryptkey']);
754	$this->iv = $GLOBALS['phpgw_info']['server']['mcrypt_iv'];
755	$GLOBALS['phpgw']->crypto->init(array($this->key,$this->iv));
756
757	$GLOBALS['phpgw_info']['user'] = $this->user;
758	$GLOBALS['phpgw_info']['hooks'] = $this->hooks;
759
760	$GLOBALS['phpgw_info']['user']['session_ip'] = $session['session_ip'];
761	$GLOBALS['phpgw_info']['user']['passwd'] = base64_decode($this->appsession('password','phpgwapi'));
762
763	if ($userid_array[1] != $GLOBALS['phpgw_info']['user']['domain'])
764	{
765	if(is_object($GLOBALS['phpgw']->log))
766	{
767	$GLOBALS['phpgw']->log->message(array(
768	'text' => 'W-VerifySession, the domains %1 and %2 don\t match',
769	'p1' => $userid_array[1],
770	'p2' => $GLOBALS['phpgw_info']['user']['domain'],
771	'line' => __LINE__,
772	'file' => __FILE__
773	));
774	$GLOBALS['phpgw']->log->commit();
775	}
776
777	if(is_object($GLOBALS['phpgw']->crypto))
778	{
779	$GLOBALS['phpgw']->crypto->cleanup();
780	unset($GLOBALS['phpgw']->crypto);
781	}
782	return False;
783	}
784
785	if(@$GLOBALS['phpgw_info']['server']['sessions_checkip'])
786	{
787	if((PHP_OS != 'Windows') && (PHP_OS != 'WINNT') &&
788	(!$GLOBALS['phpgw_info']['user']['session_ip'] \|\| $GLOBALS['phpgw_info']['user']['session_ip'] != $this->getuser_ip())
789	)
790	{
791	if(is_object($GLOBALS['phpgw']->log))
792	{
793	// This needs some better wording
794	$GLOBALS['phpgw']->log->message(array(
795	'text' => 'W-VerifySession, IP %1 doesn\'t match IP %2 in session table',
796	'p1' => $this->getuser_ip(),
797	'p2' => $GLOBALS['phpgw_info']['user']['session_ip'],
798	'line' => __LINE__,
799	'file' => __FILE__
800	));
801	$GLOBALS['phpgw']->log->commit();
802	}
803
804	if(is_object($GLOBALS['phpgw']->crypto))
805	{
806	$GLOBALS['phpgw']->crypto->cleanup();
807	unset($GLOBALS['phpgw']->crypto);
808	}
809	return False;
810	}
811	}
812
813	$GLOBALS['phpgw']->acl->acl($this->account_id);
814	$GLOBALS['phpgw']->accounts->accounts($this->account_id);
815	$GLOBALS['phpgw']->preferences->preferences($this->account_id);
816	$GLOBALS['phpgw']->applications->applications($this->account_id);
817
818	if (! $this->account_lid)
819	{
820	if(is_object($GLOBALS['phpgw']->log))
821	{
822	// This needs some better wording
823	$GLOBALS['phpgw']->log->message(array(
824	'text' => 'W-VerifySession, account_id is empty',
825	'line' => __LINE__,
826	'file' => __FILE__
827	));
828	$GLOBALS['phpgw']->log->commit();
829	}
830
831	if(is_object($GLOBALS['phpgw']->crypto))
832	{
833	$GLOBALS['phpgw']->crypto->cleanup();
834	unset($GLOBALS['phpgw']->crypto);
835	}
836	return False;
837	}
838	else
839	{
840	return True;
841	}
842	}
843
844	/**
845	* Validate a peer server login request
846	*
847	* @param string $login login name
848	* @param string $password password
849	* @return bool login ok?
850	*/
851	function create_server($login,$passwd)
852	{
853	$GLOBALS['phpgw']->interserver = CreateObject('phpgwapi.interserver');
854	$this->login = $login;
855	$this->passwd = $passwd;
856	$this->clean_sessions();
857	$login_array = explode('@', $login);
858	$this->account_lid = $login_array[0];
859	$now = time();
860
861	if ($login_array[1] != '')
862	{
863	$this->account_domain = $login_array[1];
864	}
865	else
866	{
867	$this->account_domain = $GLOBALS['phpgw_info']['server']['default_domain'];
868	}
869
870	$serverdata = array(
871	'server_name' => $this->account_domain,
872	'username' => $this->account_lid,
873	'password' => $passwd
874	);
875	if (!$GLOBALS['phpgw']->interserver->auth($serverdata))
876	{
877	return False;
878	exit;
879	}
880
881	if (!$GLOBALS['phpgw']->interserver->exists($this->account_lid))
882	{
883	$this->account_id = $GLOBALS['phpgw']->interserver->name2id($this->account_lid);
884	}
885	$GLOBALS['phpgw_info']['user']['account_id'] = $this->account_id;
886	$GLOBALS['phpgw']->interserver->serverid = $this->account_id;
887
888	$this->sessionid = md5($GLOBALS['phpgw']->common->randomstring(10));
889	$this->kp3 = md5($GLOBALS['phpgw']->common->randomstring(15));
890
891	/* re-init the crypto object */
892	$this->key = md5($this->kp3 . $this->sessionid . $GLOBALS['phpgw_info']['server']['encryptkey']);
893	$this->iv = $GLOBALS['phpgw_info']['server']['mcrypt_iv'];
894	$GLOBALS['phpgw']->crypto->init(array($this->key,$this->iv));
895
896	//$this->read_repositories(False);
897
898	$GLOBALS['phpgw_info']['user'] = $this->user;
899	$GLOBALS['phpgw_info']['hooks'] = $this->hooks;
900
901	$this->appsession('password','phpgwapi',base64_encode($this->passwd));
902	$session_flags = 'S';
903
904	$user_ip = $this->getuser_ip();
905
906	$GLOBALS['phpgw']->db->transaction_begin();
907	$this->register_session($login,$user_ip,$now,$session_flags);
908
909	$this->log_access($this->sessionid,$login,$user_ip,$this->account_id);
910
911	$this->appsession('account_previous_login','phpgwapi',$GLOBALS['phpgw']->auth->previous_login);
912	$GLOBALS['phpgw']->auth->update_lastlogin($this->account_id,$user_ip);
913	$GLOBALS['phpgw']->db->transaction_commit();
914
915	return array($this->sessionid,$this->kp3);
916	}
917
918	/**
919	* Functions for appsession data and session cache
920	*/
921
922	/**
923	* Is this also useless?? (skwashd)
924	*/
925	function read_repositories($cached='',$write_cache=True)
926	{
927	$GLOBALS['phpgw']->acl->acl($this->account_id);
928	$GLOBALS['phpgw']->accounts->accounts($this->account_id);
929	$GLOBALS['phpgw']->preferences->preferences($this->account_id);
930	$GLOBALS['phpgw']->applications->applications($this->account_id);
931
932	if(@$cached)
933	{
934	$this->user = $this->appsession('phpgw_info_cache','phpgwapi');
935	if(!empty($this->user))
936	{
937	$GLOBALS['phpgw']->preferences->data = $this->user['preferences'];
938	if (!isset($GLOBALS['phpgw_info']['apps']) \|\| !is_array($GLOBALS['phpgw_info']['apps']))
939	{
940	$GLOBALS['phpgw']->applications->read_installed_apps();
941	}
942	}
943	else
944	{
945	$this->setup_cache($write_cache);
946	}
947	}
948	else
949	{
950	$this->setup_cache($write_cache);
951	}
952	$this->hooks = $GLOBALS['phpgw']->hooks->read();
953	}
954
955	/**
956	* Is this also useless?? (skwashd)
957	*/
958	function setup_cache($write_cache=True)
959	{
960	$this->user = $GLOBALS['phpgw']->accounts->read_repository();
961	$this->user['acl'] = $GLOBALS['phpgw']->acl->read_repository();
962	$this->user['preferences'] = $GLOBALS['phpgw']->preferences->read_repository();
963	$this->user['apps'] = $GLOBALS['phpgw']->applications->read_repository();
964	//@reset($this->data['user']['apps']);
965
966	$this->user['domain'] = $this->account_domain;
967	$this->user['sessionid'] = $this->sessionid;
968	$this->user['kp3'] = $this->kp3;
969	$this->user['session_ip'] = $this->getuser_ip();
970	$this->user['session_lid'] = $this->account_lid.'@'.$this->account_domain;
971	$this->user['account_id'] = $this->account_id;
972	$this->user['account_lid'] = $this->account_lid;
973	$this->user['userid'] = $this->account_lid;
974	$this->user['passwd'] = @$this->passwd;
975	if(@$GLOBALS['phpgw_info']['server']['cache_phpgw_info'] && $write_cache)
976	{
977	$this->delete_cache();
978	$this->appsession('phpgw_info_cache','phpgwapi',$this->user);
979	}
980	}
981
982	/**
983	* This looks to be useless
984	* This will capture everything in the $GLOBALS['phpgw_info'] including server info,
985	* and store it in appsessions. This is really incompatible with any type of restoring
986	* from appsession as the saved user info is really in ['user'] rather than the root of
987	* the structure, which is what this class likes.
988	*/
989	function save_repositories()
990	{
991	$phpgw_info_temp = $GLOBALS['phpgw_info'];
992	$phpgw_info_temp['user']['kp3'] = '';
993	$phpgw_info_temp['flags'] = array();
994
995	if ($GLOBALS['phpgw_info']['server']['cache_phpgw_info'])
996	{
997	$this->appsession('phpgw_info_cache','phpgwapi',$phpgw_info_temp);
998	}
999	}
1000
1001	function restore()
1002	{
1003	$sessionData = $this->appsession('sessiondata');
1004
1005	if (!empty($sessionData) && is_array($sessionData))
1006	{
1007	foreach($sessionData as $key => $value)
1008	{
1009	global $$key;
1010	$$key = $value;
1011	$this->variableNames[$key] = 'registered';
1012	// echo 'restored: '.$key.', ' . $value . '<br>';
1013	}
1014	}
1015	}
1016
1017	/**
1018	* Save the current values of all registered variables
1019	*/
1020	function save()
1021	{
1022	if (is_array($this->variableNames))
1023	{
1024	reset($this->variableNames);
1025	while(list($key, $value) = each($this->variableNames))
1026	{
1027	if ($value == 'registered')
1028	{
1029	global $$key;
1030	$sessionData[$key] = $$key;
1031	}
1032	}
1033	$this->appsession('sessiondata','',$sessionData);
1034	}
1035	}
1036
1037	/**
1038	* Create a list a variable names, which data needs to be restored
1039	*
1040	* @param string $_variableName name of variable to be registered
1041	*/
1042	function register($_variableName)
1043	{
1044	$this->variableNames[$_variableName]='registered';
1045	#print 'registered '.$_variableName.'<br>';
1046	}
1047
1048	/**
1049	* Mark variable as unregistered
1050	*
1051	* @param string $_variableName name of variable to deregister
1052	*/
1053	function unregister($_variableName)
1054	{
1055	$this->variableNames[$_variableName]='unregistered';
1056	#print 'unregistered '.$_variableName.'<br>';
1057	}
1058
1059	/**
1060	* Check if we have a variable registred already
1061	*
1062	* @param string $_variableName name of variable to check
1063	* @return bool was the variable found?
1064	*/
1065	function is_registered($_variableName)
1066	{
1067	if ($this->variableNames[$_variableName] == 'registered')
1068	{
1069	return True;
1070	}
1071	else
1072	{
1073	return False;
1074	}
1075	}
1076	/**
1077	* Additional tracking of user actions - prevents reposts/use of back button
1078	*
1079	* @author skwashd
1080	* @return string current history id
1081	*/
1082	function generate_click_history()
1083	{
1084	if(!isset($this->history_id))
1085	{
1086	$this->history_id = md5($this->login . time());
1087	$history = $this->appsession($location = 'history', $appname = 'phpgwapi');
1088
1089	if(count($history) >= $GLOBALS['phpgw_info']['server']['max_history'])
1090	{
1091	array_shift($history);
1092	$this->appsession($location = 'history', $appname = 'phpgwapi', $history);
1093	}
1094	}
1095	return $this->history_id;
1096	}
1097
1098	/**
1099	* Detects if the page has already been called before - good for forms
1100	*
1101	* @author skwashd
1102	* @param bool $diplay_error when implemented will use the generic error handling code
1103	* @return True if called previously, else False - call ok
1104	*/
1105	function is_repost($display_error = False)
1106	{
1107	$history = $this->appsession($location = 'history', $appname = 'phpgwapi');
1108	if(isset($history[$_GET['click_history']]))
1109	{
1110	if($display_error)
1111	{
1112	$GLOBALS['phpgw']->redirect_link('/error.php', 'type=repost');//more on this later :)
1113	}
1114	else
1115	{
1116	return True; //handled by the app
1117	}
1118	}
1119	else
1120	{
1121	$history[$_GET['click_history']] = True;
1122	$this->appsession($location = 'history', $appname = 'phpgwapi', $history);
1123	return False;
1124	}
1125	}
1126
1127	/**
1128	* Generate a url which supports url or cookies based sessions
1129	*
1130	* @param string $url a url relative to the egroupware install root
1131	* @param array $extravars query string arguements
1132	* @return string generated url
1133	*/
1134	function link($url, $extravars = '')
1135	{
1136	//echo "<p>session::link(url='".print_r($url,True)."',extravars='".print_r($extravars,True)."')";
1137	/* first we process the $url to build the full scriptname */
1138	$full_scriptname = True;
1139
1140	$url_firstchar = substr($url ,0,1);
1141	if ($url_firstchar == '/' && $GLOBALS['phpgw_info']['server']['webserver_url'] == '/')
1142	{
1143	$full_scriptname = False;
1144	}
1145
1146	if ($url_firstchar != '/')
1147	{
1148	$app = $GLOBALS['phpgw_info']['flags']['currentapp'];
1149	if ($app != 'home' && $app != 'login' && $app != 'logout')
1150	{
1151	$url = $app.'/'.$url;
1152	}
1153	}
1154
1155	if($full_scriptname)
1156	{
1157	$webserver_url_count = strlen($GLOBALS['phpgw_info']['server']['webserver_url'])-1;
1158	if(substr($GLOBALS['phpgw_info']['server']['webserver_url'] ,$webserver_url_count,1) != '/' && $url_firstchar != '/')
1159	{
1160	$url = $GLOBALS['phpgw_info']['server']['webserver_url'] .'/'. $url;
1161	}
1162	else
1163	{
1164	$url = $GLOBALS['phpgw_info']['server']['webserver_url'] . $url;
1165	}
1166	}
1167
1168	if(@isset($GLOBALS['phpgw_info']['server']['enforce_ssl']) && $GLOBALS['phpgw_info']['server']['enforce_ssl']) // && !$_SERVER['HTTPS']) imho https should always be a full path - skwashd
1169	{
1170	if(substr($url ,0,4) != 'http')
1171	{
1172	$url = 'https://'.$GLOBALS['phpgw_info']['server']['hostname'].$url;
1173	}
1174	else
1175	{
1176	$url = str_replace ( 'http:', 'https:', $url);
1177	}
1178	}
1179
1180	/* Now we process the extravars into a proper url format */
1181	/* if its not an array, then we turn it into one */
1182	/* We do this to help prevent any duplicates from being sent. */
1183	if (!is_array($extravars) && $extravars != '')
1184	{
1185	$new_extravars = Array();
1186
1187	$a = explode('&', $extravars);
1188	$i = 0;
1189	while ($i < count($a))
1190	{
1191	$b = split('=', $a[$i],2);
1192	// Check if this value doesn't already exist in new_extravars
1193	if(array_key_exists($b[0], $new_extravars))
1194	{
1195	// print "Debug::Error !!! " . $b[0] . " ($i) already exists<br>";
1196	if( eregi("\[\]", $b[0]) )
1197	{
1198	$b[0] = eregi_replace("\[\]", "[$i]", $b[0]);
1199	}
1200	}
1201
1202	$new_extravars[$b[0]] = $b[1];
1203	$i++;
1204	}
1205	$extravars = $new_extravars;
1206	unset($new_extravars);
1207	}
1208
1209	/* if using frames we make sure there is a framepart */
1210	if(@defined('PHPGW_USE_FRAMES') && PHPGW_USE_FRAMES)
1211	{
1212	if (!isset($extravars['framepart']))
1213	{
1214	$extravars['framepart']='body';
1215	}
1216	}
1217
1218	/* add session params if not using cookies */
1219	if (@!$GLOBALS['phpgw_info']['server']['usecookies'])
1220	{
1221	$extravars['sessionid'] = $this->sessionid;
1222	$extravars['kp3'] = $this->kp3;
1223	$extravars['domain'] = $this->account_domain;
1224	}
1225
1226	//used for repost prevention
1227	// $extravars['click_history'] = $this->generate_click_history();
1228
1229	/* if we end up with any extravars then we generate the url friendly string */
1230	if (is_array($extravars))
1231	{
1232	$new_extravars = '';
1233	foreach($extravars as $key => $value)
1234	{
1235	if (!empty($new_extravars))
1236	{
1237	$new_extravars .= '&';
1238	}
1239	$new_extravars .= $key.'='.urlencode($value);
1240	}
1241	$url .= '?' . $new_extravars;
1242	}
1243	//echo " = '$url'</p>\n";
1244	return $url;
1245	}
1246
1247	/**
1248	* The remaining methods are abstract - as they are unique for each session handler
1249	*/
1250
1251	/**
1252	* Load user's session information
1253	*
1254	* The sessionid of the session to read is passed in the class-var $this->sessionid
1255	*
1256	* @return mixed the session data
1257	*/
1258	function read_session()
1259	{}
1260
1261	/**
1262	* Remove stale sessions out of the database
1263	*/
1264	function clean_sessions()
1265	{}
1266
1267	/**
1268	* Set paramaters for cookies - only implemented in PHP4 sessions
1269	*
1270	* @param string $domain domain name to use in cookie
1271	*/
1272
1273	function set_cookie_params($domain)
1274	{}
1275
1276	/**
1277	* Create a new session id
1278	*
1279	* @return string a new session id
1280	*/
1281	function new_session_id()
1282	{}
1283
1284	/**
1285	* Create a new session
1286	*
1287	* @param string $login user login
1288	* @param string $user_ip users ip address
1289	* @param int $now time now as a unix timestamp
1290	* @param string $session_flags A = Anonymous, N = Normal
1291	*/
1292	function register_session($login,$user_ip,$now,$session_flags)
1293	{}
1294
1295	/**
1296	* Update the date last active info for the session, so the login does not expire
1297	*
1298	* @return bool did it suceed?
1299	*/
1300	function update_dla()
1301	{}
1302
1303	/**
1304	* Terminate a session
1305	*
1306	* @param string $sessionid the id of the session to be terminated
1307	* @param string $kp3 - NOT SURE
1308	* @return bool did it suceed?
1309	*/
1310	function destroy($sessionid, $kp3)
1311	{}
1312
1313	/**
1314	* Functions for appsession data and session cache
1315	*/
1316
1317	/**
1318	* Delete all data from the session cache for a user
1319	*
1320	* @param int $accountid user account id, defaults to current user (optional)
1321	*/
1322	function delete_cache($accountid='')
1323	{}
1324
1325	/**
1326	* Stores or retrieves information from the sessions cache
1327	*
1328	* @param string $location identifier for data
1329	* @param string $appname name of app which is responsbile for the data
1330	* @param mixed $data data to be stored, if left blank data is retreived (optional)
1331	* @return mixed data from cache, only returned if $data arg is not used
1332	*/
1333	function appsession($location = 'default', $appname = '', $data = '##NOTHING##')
1334	{}
1335
1336	/**
1337	* Get list of normal / non-anonymous sessions
1338	* Note: The data from the session-files get cached in the app_session phpgwapi/php4_session_cache
1339	*
1340	* @author ralfbecker
1341	* @param int $start session to start at
1342	* @param string $order field to sort on
1343	* @param string $sort sort order
1344	* @param bool $all_no_sort list all with out sorting (optional) default False
1345	* @return array info for all current sessions
1346	*/
1347	function list_sessions($start,$order,$sort,$all_no_sort = False)
1348	{}
1349
1350	/**
1351	* Get the number of normal / non-anonymous sessions
1352	*
1353	* @author ralfbecker
1354	* @return int number of sessions
1355	*/
1356	function total()
1357	{}
1358	}
1359
1360	if(empty($GLOBALS['phpgw_info']['server']['sessions_type']))
1361	{
1362	$GLOBALS['phpgw_info']['server']['sessions_type'] = 'php4'; // the more performant default
1363	}
1364	// for php4 sessions, check if the extension is loaded, try loading it and fallback to db sessions if not
1365	if ($GLOBALS['phpgw_info']['server']['sessions_type'] == 'php4' && !extension_loaded('session'))
1366	{
1367	// some constanst for pre php4.3
1368	if (!defined('PHP_SHLIB_SUFFIX'))
1369	{
1370	define('PHP_SHLIB_SUFFIX',strtoupper(substr(PHP_OS, 0,3)) == 'WIN' ? 'dll' : 'so');
1371	}
1372	if (!defined('PHP_SHLIB_PREFIX'))
1373	{
1374	define('PHP_SHLIB_PREFIX',PHP_SHLIB_SUFFIX == 'dll' ? 'php_' : '');
1375	}
1376	if (!function_exists('dl') \|\| !@dl(PHP_SHLIB_PREFIX.'session'.'.'.PHP_SHLIB_SUFFIX))
1377	{
1378	$GLOBALS['phpgw_info']['server']['sessions_type'] = 'db'; // fallback if we have no php4 sessions support
1379	}
1380	}
1381	include_once(PHPGW_API_INC.'/class.sessions_'.$GLOBALS['phpgw_info']['server']['sessions_type'].'.inc.php');

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