Clarify and simplify how session is destroyed and separate from session restore mechanism
[squirrelmail.git] / src / login.php
1 <?php
2
3 /**
4 * login.php -- simple login screen
5 *
6 * This a simple login screen. Some housekeeping is done to clean
7 * cookies and find language.
8 *
9 * @copyright &copy; 1999-2007 The SquirrelMail Project Team
10 * @license http://opensource.org/licenses/gpl-license.php GNU Public License
11 * @version $Id$
12 * @package squirrelmail
13 */
14
15 /** This is the login page */
16 define('PAGE_NAME', 'login');
17
18 /**
19 * Include the SquirrelMail initialization file.
20 */
21 require('../include/init.php');
22
23 /* SquirrelMail required files. */
24 require_once(SM_PATH . 'functions/imap_general.php');
25 require_once(SM_PATH . 'functions/forms.php');
26
27 /**
28 * $squirrelmail_language is set by a cookie when the user selects
29 * language and logs out
30 */
31 set_up_language($squirrelmail_language, TRUE, TRUE);
32
33 /**
34 * In case the last session was not terminated properly, make sure
35 * we get a new one, but make sure we preserve session_expired_*
36 */
37 $sep = '';
38 $sel = '';
39 sqGetGlobalVar('session_expired_post', $sep, SQ_SESSION);
40 sqGetGlobalVar('session_expired_location', $sel, SQ_SESSION);
41
42 /* blow away session */
43 sqsession_destroy();
44
45 /**
46 * in some rare instances, the session seems to stick
47 * around even after destroying it (!!), so if it does,
48 * we'll manually flatten the $_SESSION data
49 */
50 if (!empty($_SESSION)) {
51 $_SESSION = array();
52 }
53
54 /* start session and put session_expired_* variables back in session */
55 @sqsession_is_active();
56 if (!empty($sep) && !empty($sel)) {
57 sqsession_register($sep, 'session_expired_post');
58 sqsession_register($sel, 'session_expired_location');
59 }
60
61 /**
62 * This detects if the IMAP server has logins disabled, and if so,
63 * squelches the display of the login form and puts up a message
64 * explaining the situation.
65 */
66 if($imap_auth_mech == 'login') {
67 /**
68 * detect disabled login, only when imapServerAddress contains
69 * server address and not mapping. See sqimap_get_user_server()
70 */
71 if (substr($imapServerAddress, 0, 4) != "map:") {
72 $imap = sqimap_create_stream($imapServerAddress, $imapPort, $use_imap_tls);
73 $logindisabled = sqimap_capability($imap,'LOGINDISABLED');
74 sqimap_logout($imap);
75 if ($logindisabled) {
76 $string = _("The IMAP server is reporting that plain text logins are disabled.").'<br />'.
77 _("Using CRAM-MD5 or DIGEST-MD5 authentication instead may work.").'<br />';
78 if (!$use_imap_tls) {
79 $string .= _("Also, the use of TLS may allow SquirrelMail to login.").'<br />';
80 }
81 $string .= _("Please contact your system administrator and report this error.");
82 error_box($string);
83 // display footer (closes html tags) and stop script execution
84 $oTemplate->display('footer.tpl');
85 exit;
86 }
87 }
88 }
89
90 do_hook('login_cookie', $null);
91
92 $loginname_value = (sqGetGlobalVar('loginname', $loginname) ? htmlspecialchars($loginname) : '');
93
94 //FIXME: should be part of the template, not the core!
95 /* Output the javascript onload function. */
96 $header = "<script type=\"text/javascript\">\n" .
97 "<!--\n".
98 " function squirrelmail_loginpage_onload() {\n".
99 " var textElements = 0;\n".
100 " for (i = 0; i < document.forms[0].elements.length; i++) {\n".
101 " if (document.forms[0].elements[i].type == \"text\" || document.forms[0].elements[i].type == \"password\") {\n".
102 " textElements++;\n".
103 " if (textElements == " . (isset($loginname) ? 2 : 1) . ") {\n".
104 " document.forms[0].elements[i].focus();\n".
105 " break;\n".
106 " }\n".
107 " }\n".
108 " }\n".
109 " }\n".
110 "// -->\n".
111 "</script>\n";
112
113 if (@file_exists($theme[$theme_default]['PATH']))
114 @include ($theme[$theme_default]['PATH']);
115
116 if (! isset($color) || ! is_array($color)) {
117 // Add default color theme, if theme loading fails
118 $color = array();
119 $color[0] = '#dcdcdc'; /* light gray TitleBar */
120 $color[1] = '#800000'; /* red */
121 $color[2] = '#cc0000'; /* light red Warning/Error Messages */
122 $color[4] = '#ffffff'; /* white Normal Background */
123 $color[7] = '#0000cc'; /* blue Links */
124 $color[8] = '#000000'; /* black Normal text */
125 }
126
127 displayHtmlHeader( "$org_name - " . _("Login"), $header, FALSE );
128
129
130
131 /* If they don't have a logo, don't bother.. */
132 $logo_str = '';
133 if (isset($org_logo) && $org_logo) {
134
135 if (isset($org_logo_width) && is_numeric($org_logo_width) &&
136 $org_logo_width>0) {
137 $width = $org_logo_width;
138 } else {
139 $width = '';
140 }
141 if (isset($org_logo_height) && is_numeric($org_logo_height) &&
142 $org_logo_height>0) {
143 $height = $org_logo_height;
144 } else {
145 $height = '';
146 }
147
148 $logo_str = create_image($org_logo, sprintf(_("%s Logo"), $org_name),
149 $width, $height, '', 'sqm_loginImage');
150
151 }
152
153 $sm_attribute_str = '';
154 if (isset($hide_sm_attributions) && !$hide_sm_attributions) {
155 $sm_attribute_str = _("SquirrelMail Webmail")."\n" .
156 _("By the SquirrelMail Project Team");
157 }
158
159 if(sqgetGlobalVar('mailtodata', $mailtodata)) {
160 $mailtofield = addHidden('mailtodata', $mailtodata);
161 } else {
162 $mailtofield = '';
163 }
164
165 $password_field = addPwField('secretkey');
166 $login_extra = addHidden('js_autodetect_results', SMPREF_JS_OFF).
167 $mailtofield .
168 addHidden('just_logged_in', '1');
169
170 session_write_close();
171
172 $oTemplate->assign('logo_str', $logo_str, FALSE);
173 $oTemplate->assign('logo_path', $org_logo);
174 $oTemplate->assign('sm_attribute_str', $sm_attribute_str);
175 // i18n: The %s represents the service provider's name
176 $oTemplate->assign('org_name_str', sprintf (_("%s Login"), $org_name));
177 // i18n: The %s represents the service provider's name
178 $oTemplate->assign('org_logo_str', sprintf (_("The %s logo"), $org_name));
179 $oTemplate->assign('login_field_value', $loginname_value);
180 $oTemplate->assign('login_extra', $login_extra, FALSE);
181
182 //FIXME: need to remove *ALL* HTML from this file!
183 echo '<body onload="squirrelmail_loginpage_onload()">'."\n";
184 echo '<form action="redirect.php" method="post" onsubmit="document.forms[0].js_autodetect_results.value='. SMPREF_JS_ON .'">'."\n";
185 do_hook('login_top', $null);
186
187 $oTemplate->display('login.tpl');
188
189 //FIXME: need to remove *ALL* HTML from this file!
190 echo "</form>\n";
191 do_hook('login_bottom', $null);
192
193 // Turn off delayed error handling to make sure all errors are dumped.
194 $oErrorHandler->setDelayedErrors(false);
195
196 $oTemplate->display('footer.tpl');