1: # The LearningOnline Network
2: # Login Screen
3: #
4: # $Id: lonlogin.pm,v 1.61 2004/12/18 23:58:34 raeburn Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28:
29: package Apache::lonlogin;
30:
31: use strict;
32: use Apache::Constants qw(:common);
33: use CGI::Cookie();
34: use Apache::File ();
35: use Apache::lonnet();
36: use Apache::loncommon();
37: use Apache::lonauth();
38: use Apache::lonlocal;
39:
40: sub handler {
41: my $r = shift;
42: &Apache::loncommon::no_cache($r);
43: &Apache::lonlocal::get_language_handle($r);
44: &Apache::loncommon::content_type($r,'text/html');
45: $r->send_http_header;
46: return OK if $r->header_only;
47:
48:
49: # Are we re-routing?
50: if (-e '/home/httpd/html/lon-status/reroute.txt') {
51: &Apache::lonauth::reroute($r);
52: return OK;
53: }
54:
55: # -------------------------------- Prevent users from attempting to login twice
56: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
57: my $lonid=$cookies{'lonID'};
58: my $cookie;
59: if ($lonid) {
60: my $handle=$lonid->value;
61: $handle=~s/\W//g;
62: my $lonidsdir=$r->dir_config('lonIDsDir');
63: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
64: # Indeed, a valid token is found
65: my $bodytag=&Apache::loncommon::bodytag('Already logged in');
66: $r->print(<<ENDFAILED);
67: <html>
68: <head>
69: <title>Already logged in</title>
70: </head>
71: $bodytag
72: <h1>You are already logged in</h1>
73: <p>Please either <a href="/adm/roles">continue the current session</a> or
74: <a href="/adm/logout">logout</a>.</p>
75: <p>
76: <a href="/adm/loginproblems.html">Problems?</a></p>
77: </body>
78: </html>
79: ENDFAILED
80: return OK;
81: }
82: }
83:
84: # ---------------------------------------------------- No valid token, continue
85:
86: &Apache::loncommon::get_unprocessed_cgi
87: ($ENV{'QUERY_STRING'}.'&'.$ENV{'request.querystring'},
88: ['interface','username','domain','firsturl','localpath','localres']);
89:
90:
91: # ----------------------------------------------------------- Process Interface
92: $ENV{'form.interface'}=~s/\W//g;
93:
94: my $textbrowsers=$r->dir_config('lonTextBrowsers');
95: my $httpbrowser=$ENV{"HTTP_USER_AGENT"};
96:
97: foreach (split(/\:/,$textbrowsers)) {
98: if ($httpbrowser=~/$_/i) {
99: $ENV{'form.interface'}='textual';
100: }
101: }
102:
103: my $fullgraph=($ENV{'form.interface'} ne 'textual');
104: my $port_to_use=$r->dir_config('lonhttpdPort');
105: if (!defined($port_to_use)) {
106: $port_to_use='8080';
107: }
108: my $iconpath= 'http://'.$ENV{'HTTP_HOST'}.':'.$port_to_use.
109: $r->dir_config('lonIconsURL');
110: my $domain = $r->dir_config('lonDefDomain');
111: if (($ENV{'form.domain'}) &&
112: ($Apache::lonnet::domaindescription{$ENV{'form.domain'}})) {
113: $domain=$ENV{'form.domain'};
114: }
115: my $role = $r->dir_config('lonRole');
116: my $loadlim = $r->dir_config('lonLoadLim');
117: my $servadm = $r->dir_config('lonAdmEMail');
118: my $sysadm = $r->dir_config('lonSysEMail');
119: my $lonhost = $r->dir_config('lonHostID');
120: my $tabdir = $r->dir_config('lonTabDir');
121: my $include = $r->dir_config('lonIncludes');
122: my $expire = $r->dir_config('lonExpire');
123: my $version = $r->dir_config('lonVersion');
124:
125: # --------------------------------------------- Default values for login fields
126:
127: my $authusername=($ENV{'form.username'}?$ENV{'form.username'}:'');
128: my $authdomain=($ENV{'form.domain'}?$ENV{'form.domain'}:$domain);
129:
130: # ---------------------------------------------------------- Determine own load
131: my $loadavg;
132: {
133: my $loadfile=Apache::File->new('/proc/loadavg');
134: $loadavg=<$loadfile>;
135: }
136: $loadavg =~ s/\s.*//g;
137: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
138: my $userloadpercent=&Apache::lonnet::userload();
139:
140: # ------------------------------------------------------- Do the load balancing
141: my $otherserver='http://'.$ENV{'SERVER_NAME'};
142: my $firsturl=
143: ($ENV{'request.firsturl'}?$ENV{'request.firsturl'}:$ENV{'form.firsturl'});
144: # ---------------------------------------- Are we access server and overloaded?
145: if (($role eq 'access') &&
146: (($userloadpercent>100.0)||($loadpercent>100.0))) {
147: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent);
148: if ($unloaded) { $otherserver=$unloaded; }
149: }
150:
151: # ----------------------------------------------------------- Get announcements
152: my $announcements=&Apache::lonnet::getannounce();
153: # -------------------------------------------------------- Set login parameters
154:
155: my @hexstr=('0','1','2','3','4','5','6','7',
156: '8','9','a','b','c','d','e','f');
157: my $lkey='';
158: for (0..7) {
159: $lkey.=$hexstr[rand(15)];
160: }
161:
162: my $ukey='';
163: for (0..7) {
164: $ukey.=$hexstr[rand(15)];
165: }
166:
167: my $lextkey=hex($lkey);
168: if ($lextkey>2147483647) { $lextkey-=4294967296; }
169:
170: my $uextkey=hex($ukey);
171: if ($uextkey>2147483647) { $uextkey-=4294967296; }
172:
173: # -------------------------------------------------------- Store away log token
174: my $logtoken=Apache::lonnet::reply(
175: 'tmpput:'.$ukey.$lkey.'&'.$firsturl,
176: $lonhost);
177:
178: # ------------------- If we cannot talk to ourselves, we are in serious trouble
179:
180: if ($logtoken eq 'con_lost') {
181: my $spares='';
182:
183: foreach my $hostid (keys(%Apache::lonnet::spareid)) {
184: next if ($hostid eq $lonhost);
185: $spares.='<br /><font size="+1"><a href="http://'.
186: $Apache::lonnet::hostname{$hostid}.
187: '/adm/login?domain='.$authdomain.'">'.
188: $Apache::lonnet::hostname{$hostid}.'</a>'.
189: ' (preferred)</font>'.$/;
190: }
191: $spares.= '<br />';
192: foreach my $hostid (keys(%Apache::lonnet::hostname)) {
193: next if ($hostid eq $lonhost || $Apache::lonnet::spareid{$hostid});
194: $spares.='<br /><a href="http://'.
195: $Apache::lonnet::hostname{$hostid}.
196: '/adm/login?domain='.$authdomain.'">'.
197: $Apache::lonnet::hostname{$hostid}.'</a>';
198: }
199: $r->print(<<ENDTROUBLE);
200: <html>
201: <head><title>The LearningOnline Network with CAPA</title></head>
202: <body bgcolor="#FFFFFF">
203: <img src="/adm/lonKaputt/lonlogo_broken.gif" align="right" />
204: <h3>This LON-CAPA server is temporarily not available for login</h3>
205: <p>Please attempt to login to one of the following servers:</p>$spares
206: <p>If the problem persists, please contact <tt>$servadm</tt>.</p>
207: </body>
208: </html>
209: ENDTROUBLE
210: return OK;
211: }
212:
213: # ----------------------------------------------- Apparently we are in business
214:
215: my $domainlogo=&Apache::loncommon::domainlogo($domain);
216: $servadm=~s/\,/\<br \/\>/g;
217: $sysadm=~s/\,/\<br \/\>/g;
218:
219: # --------------------------------------------------- Print login screen header
220: $r->print(<<ENDHEADER);
221: <html>
222: <head>
223: <meta HTTP-EQUIV="Refresh" CONTENT="$expire; url=/adm/roles" />
224: <title>The LearningOnline Network with CAPA Login</title>
225: </head>
226: ENDHEADER
227: # ---------------------------------------------------- Serve out DES JavaScript
228: {
229: my $jsh=Apache::File->new($include."/londes.js");
230: $r->print(<$jsh>);
231: }
232:
233: # ----------------------------------------------------------- Front page design
234: my $pgbg=
235: ($fullgraph?&Apache::loncommon::designparm('login.pgbg',$domain):'#FFFFFF');
236: my $font=
237: ($fullgraph?&Apache::loncommon::designparm('login.font',$domain):'#000000');
238: my $link=
239: ($fullgraph?&Apache::loncommon::designparm('login.link',$domain):'#0000FF');
240: my $vlink=
241: ($fullgraph?&Apache::loncommon::designparm('login.vlink',$domain):'#0000FF');
242: my $alink=&Apache::loncommon::designparm('login.alink',$domain);
243: my $mainbg=
244: ($fullgraph?&Apache::loncommon::designparm('login.mainbg',$domain):'#FFFFFF');
245: my $sidebg=
246: ($fullgraph?&Apache::loncommon::designparm('login.sidebg',$domain):'#FFFFFF');
247: my $logo=&Apache::loncommon::designparm('login.logo',$domain);
248: my $img=&Apache::loncommon::designparm('login.img',$domain);
249:
250: # ----------------------------------------------------------------------- Texts
251:
252: my %lt=&Apache::lonlocal::texthash(
253: 'un' => 'Username',
254: 'pw' => 'Password',
255: 'dom' => 'Domain',
256: 'perc' => 'percent',
257: 'load' => 'Load',
258: 'userload' => 'User Load',
259: 'about' => 'aboutlon.gif',
260: 'access' => 'accessbutton.gif',
261: 'auth' => 'userauthentication.gif',
262: 'log' => 'Log in',
263: 'help' => 'Help',
264: 'serv' => 'Server',
265: 'servadm' => 'Server Administration',
266: 'sysadm' => 'System Administration',
267: 'helpdesk' => 'Contact Helpdesk');
268:
269: # ---------------------------------------------------------- Serve rest of page
270: $r->print(<<ENDSCRIPT);
271:
272: <body bgcolor="$pgbg" text="$font" link="$link" vlink="$vlink" alink="$alink"
273: topmargin=0 leftmargin=0 marginwidth=0 marginheight=0>
274:
275: <script language="JavaScript">
276: function send()
277: {
278: this.document.server.elements.uname.value
279: =this.document.client.elements.uname.value;
280:
281: this.document.server.elements.udom.value
282: =this.document.client.elements.udom.value;
283:
284: this.document.server.elements.imagesuppress.value
285: =this.document.client.elements.imagesuppress.checked;
286:
287: this.document.server.elements.embedsuppress.value
288: =this.document.client.elements.embedsuppress.checked;
289:
290: this.document.server.elements.appletsuppress.value
291: =this.document.client.elements.appletsuppress.checked;
292:
293: this.document.server.elements.fontenhance.value
294: =this.document.client.elements.fontenhance.checked;
295:
296: this.document.server.elements.blackwhite.value
297: =this.document.client.elements.blackwhite.checked;
298:
299: this.document.server.elements.remember.value
300: =this.document.client.elements.remember.checked;
301:
302: uextkey=this.document.client.elements.uextkey.value;
303: lextkey=this.document.client.elements.lextkey.value;
304: initkeys();
305:
306: this.document.server.elements.upass.value
307: =crypted(this.document.client.elements.upass.value);
308:
309: this.document.server.submit();
310: return false;
311: }
312: </script>
313: ENDSCRIPT
314:
315: if ($fullgraph) {
316: $r->print(
317: '<table width="100%" cellpadding=0 cellspacing=0 border=0>');
318: }
319:
320: $r->print(<<ENDSERVERFORM);
321: <form name="server" action="$otherserver/adm/authenticate" method="post" target="_top">
322: <input type="hidden" name="logtoken" value="$logtoken" />
323: <input type="hidden" name="serverid" value="$lonhost" />
324: <input type="hidden" name="interface" value="$ENV{'form.interface'}" />
325: <input type="hidden" name="uname" value="" />
326: <input type="hidden" name="upass" value="" />
327: <input type="hidden" name="udom" value="" />
328: <input type="hidden" name="imagesuppress" value="" />
329: <input type="hidden" name="appletsuppress" value="" />
330: <input type="hidden" name="embedsuppress" value="" />
331: <input type="hidden" name="fontenhance" value="" />
332: <input type="hidden" name="blackwhite" value="" />
333: <input type="hidden" name="remember" value="" />
334: <input type="hidden" name="localpath" value="$ENV{'form.localpath'}" />
335: <input type="hidden" name="localres" value="$ENV{'form.localres'}" />
336: </form>
337: ENDSERVERFORM
338: if ($fullgraph) { $r->print(<<ENDTOP);
339: <!-- The LON-CAPA Header -->
340: <tr>
341:
342: <!-- Row 1 Columns 2-4 -->
343: <td width="100%" height=75 colspan=4 align="left" valign="top" bgcolor="$pgbg"><img src="$img" border=0 alt="The Learning Online Network with CAPA" /></td>
344: </tr>
345:
346: <!-- The gray bar that starts the two table frames -->
347: <tr>
348:
349: <!-- Row 2 Column 1 -->
350: <td width=182 height=27 bgcolor="$sidebg"> </td>
351:
352: <!-- Row 2 Column 2 -->
353: <td width=27 height=27 align="left" background="$iconpath/filltop.gif"><img src="$iconpath/upperleft.gif" border=0 alt="" /></td>
354:
355: <!-- Row 2 Column 3 -->
356: <td height=27 background="$iconpath/filltop.gif"><img src="$iconpath/filltop.gif" alt="" /></td>
357:
358: <!-- Row 2 Column 4 -->
359: <td width=27 height=27 align="right" background="$iconpath/filltop.gif"><img src="$iconpath/upperright.gif" border=0 alt="" /></td>
360: </tr>
361: <tr>
362:
363: <!-- A cell that will hold the 'access' and 'about' buttons -->
364: <!-- Row 3 Column 1 -->
365: <td valign="top" height=60 align="center" bgcolor="$sidebg">
366: <a href="/adm/login?interface=textual"><img src="$iconpath/$lt{'access'}" border=0 alt="Accessibility Options" /></a>
367: <br />
368: <a href="/adm/about.html"><img src="$iconpath/$lt{'about'}" border=0 alt="About LON-CAPA" /></a>
369: </td>
370:
371: <!-- The shaded space between the two main columns -->
372: <!-- Row 3 Column 2 -->
373: <td width=27 height=60 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
374:
375: <!-- The right main column holding the large LON-CAPA logo-->
376: <!-- Rows 3-4 Column 3 -->
377: <td align="center" valign="top" width="100%" height="100%" bgcolor="$mainbg">
378: <center>
379: <img src="$logo" alt="" />
380: </center>
381: </td>
382:
383: <!-- Row 3 Column 4 -->
384: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
385: </tr>
386: <tr>
387:
388: <!-- The entry form -->
389: <!-- Row 4 Column 1 -->
390: <td align="center" valign="middle" bgcolor="$sidebg">
391: ENDTOP
392: } else {
393: $r->print('<h1>The Learning<i>Online</i> Network with CAPA</h1><h2>Text-based Interface Login</h2>'.$announcements);
394: }
395: $r->print('<form name="client" onsubmit="return(send())">');
396: unless ($fullgraph) {
397: $r->print(<<ENDACCESSOPTIONS);
398: <h3>Select Accessibility Options</h3>
399: <input type="checkbox" name="imagesuppress" /> Suppress rendering of images<br />
400: <input type="checkbox" name="appletsuppress" /> Suppress Java applets<br />
401: <input type="checkbox" name="embedsuppress" /> Suppress rendering of embedded multimedia<br />
402: <input type="checkbox" name="fontenhance" /> Increase font size<br />
403: <input type="checkbox" name="blackwhite" /> Switch to black and white mode<br />
404: <p>If you have accessibility needs that are not addressed by this interface,
405: please
406: contact the system administrator at <tt>$sysadm</tt>.</p><br />
407: <input type="checkbox" name="remember" /> Remember these settings for next login<hr />
408: ENDACCESSOPTIONS
409: } else {
410: $r->print(<<ENDNOOPT);
411: <input type="hidden" name="imagesuppress" value="" />
412: <input type="hidden" name="embedsuppress" value="" />
413: <input type="hidden" name="appletsuppress" value="" />
414: <input type="hidden" name="fontenhance" value="" />
415: <input type="hidden" name="blackwhite" value="" />
416: <input type="hidden" name="remember" value="" />
417: ENDNOOPT
418: }
419: $r->print(<<ENDLOGIN);
420: <input type="hidden" name="lextkey" value="$lextkey">
421: <input type="hidden" name="uextkey" value="$uextkey">
422:
423: <!-- Start the sub-table for text and input alignment -->
424: <table border=0 cellspacing=0 cellpadding=0>
425: <tr><td bgcolor="$sidebg" colspan=2><img src="$iconpath/$lt{'auth'}" alt="User Authentication" /></td></tr>
426: <tr>
427: <td bgcolor="$mainbg"><br /><font size=-1><b> $lt{'un'}:</b></font></td>
428: <td bgcolor="$mainbg"><br /><input type="text" name="uname" size="10" value="$authusername" /></td>
429: </tr>
430: <tr>
431: <td bgcolor="$mainbg"><font size=-1><b> $lt{'pw'}:</b></font></td>
432: <td bgcolor="$mainbg"><input type="password" name="upass" size="10" /></td>
433: </tr>
434: <tr>
435: <td bgcolor="$mainbg"><font size=-1><b> $lt{'dom'}:</b></font></td>
436: <td bgcolor="$mainbg"><input type="text" name="udom" size="10" value="$authdomain" /></td>
437: </tr>
438: <tr>
439: <td bgcolor="$mainbg"> <a href="/adm/loginproblems.html">$lt{'help'}</a></td>
440: <td bgcolor="$mainbg" valign="bottom" align="center">
441: <br />
442: <input type="submit" value="$lt{'log'}" />
443: </td>
444: </tr>
445: </table>
446: <!-- End sub-table -->
447: </form>
448: ENDLOGIN
449: if ($fullgraph) {
450: my $contactblock = &contactdisplay(\%lt,$sysadm,$servadm,$version);
451: $r->print(<<ENDDOCUMENT);
452: </td>
453:
454: <!-- Row 4 Column 2 -->
455: <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
456:
457: <!-- Row 4 Column 3 -->
458: <td bgcolor="$mainbg">$announcements</td>
459:
460: <!-- Row 4 Column 4 -->
461: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
462: </tr>
463: <tr>
464:
465: <!-- Row 5 Column 1 -->
466: <td bgcolor="$sidebg" valign="middle" align="left">
467: <br />
468: <table border=0 cellspacing=0 cellpadding=0>
469: <tr>
470: <td bgcolor="$sidebg" align="left" valign="top">
471: <small><b> $lt{'dom'}: </b></small>
472: </td>
473: <td bgcolor="$sidebg" align="left" valign="top">
474: <small><tt> $domain</tt></small>
475: </td>
476: </tr>
477: <tr>
478: <td bgcolor="$sidebg" align="left" valign="top">
479: <small><b> $lt{'serv'}: </b></small>
480: </td>
481: <td bgcolor="$sidebg" align="left" valign="top">
482: <small><tt> $lonhost ($role)</tt></small>
483: </td>
484: </tr>
485: <tr>
486: <td bgcolor="$sidebg" align="left" valign="top">
487: <small><b> $lt{'load'}: </b></small>
488: </td>
489: <td bgcolor="$sidebg" align="left" valign="top">
490: <small><tt> $loadpercent $lt{'perc'}</tt></small>
491: </td>
492: </tr>
493: <tr>
494: <td bgcolor="$sidebg" align="left" valign="top">
495: <small><b> $lt{'userload'}: </b></small>
496: </td>
497: <td bgcolor="$sidebg" align="left" valign="top">
498: <small><tt> $userloadpercent $lt{'perc'}</tt></small>
499: </td>
500: </tr>
501: </table>
502: <br />
503: $contactblock
504: </td>
505:
506: <!-- Row 5 Column 2 -->
507: <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
508:
509: <!-- Row 5 Column 3 -->
510: <td width="100%" valign="bottom" bgcolor="$mainbg">
511: $domainlogo
512: </td>
513:
514: <!-- Row 5 Column 4 -->
515: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
516: </tr>
517: <tr>
518:
519: <!-- Row 6 Column 1 -->
520: <td bgcolor="$sidebg"> </td>
521:
522: <!-- Row 6 Column 2 -->
523: <td align="left" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerleft.gif" alt="" /></td>
524:
525: <!-- Row 6 Column 3 -->
526: <td background="$iconpath/fillbottom.gif"><img src="$iconpath/fillbottom.gif" alt="" /></td>
527:
528: <!-- Row 6 Column 4 -->
529: <td align="right" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerright.gif" alt="" /></td>
530: </tr>
531: </table>
532:
533: <script type="text/javascript">
534: // the if prevents the script error if the browser can not handle this
535: if ( document.client.uname ) { document.client.uname.focus(); }
536: </script>
537:
538: ENDDOCUMENT
539: }
540: $r->print('</body></html>');
541: return OK;
542: }
543:
544: sub contactdisplay {
545: my ($lt,$sysadm,$servadm,$version) = @_;
546: my $contactblock;
547: my $showsysadm = 1;
548: my $showservadm = 1;
549: my $showhelpdesk = 1;
550: if ($showsysadm) {
551: $contactblock .= '<b> '.$$lt{'sysadm'}.':</b><br />'.
552: '<tt> '.$sysadm.'</tt><br />';
553: }
554: if ($showservadm) {
555: $contactblock .= '<b> '.$$lt{'servadm'}.':</b><br />'.
556: '<tt> '.$servadm.'</tt><br /> <br />';
557: }
558: if ($showhelpdesk) {
559: $contactblock .= '<b> <a href="/adm/helpdesk?origurl='.&Apache::lonnet::escape('/adm/login').'">'.$$lt{'helpdesk'}.'</a></b><br />';
560: }
561: $contactblock .= <<"ENDBLOCK";
562: $version
563: ENDBLOCK
564: return $contactblock;
565: }
566:
567:
568: 1;
569: __END__
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