1: # The LearningOnline Network
2: # Login Screen
3: #
4: # $Id: lonlogin.pm,v 1.121 2009/05/16 01:19:29 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 Apache::File ();
34: use Apache::lonnet;
35: use Apache::loncommon();
36: use Apache::lonauth();
37: use Apache::lonlocal;
38: use Apache::migrateuser();
39: use lib '/home/httpd/lib/perl/';
40: use LONCAPA;
41:
42: sub handler {
43: my $r = shift;
44:
45: &Apache::loncommon::get_unprocessed_cgi
46: (join('&',$ENV{'QUERY_STRING'},$env{'request.querystring'},
47: $ENV{'REDIRECT_QUERY_STRING'}),
48: ['interface','username','domain','firsturl','localpath','localres',
49: 'token']);
50: if (!defined($env{'form.firsturl'})) {
51: &Apache::lonacc::get_posted_cgi($r,['firsturl']);
52: }
53:
54: # -- check if they are a migrating user
55: if (defined($env{'form.token'})) {
56: return &Apache::migrateuser::handler($r);
57: }
58:
59: &Apache::loncommon::no_cache($r);
60: &Apache::lonlocal::get_language_handle($r);
61: &Apache::loncommon::content_type($r,'text/html');
62: $r->send_http_header;
63: return OK if $r->header_only;
64:
65:
66: # Are we re-routing?
67: if (-e '/home/httpd/html/lon-status/reroute.txt') {
68: &Apache::lonauth::reroute($r);
69: return OK;
70: }
71:
72:
73: # -------------------------------- Prevent users from attempting to login twice
74: my $handle = &Apache::lonnet::check_for_valid_session($r);
75: if ($handle=~/^publicuser\_/) {
76: # For "public user" - remove it, we apparently really want to login
77: unlink($r->dir_config('lonIDsDir')."/$handle.id");
78: } elsif ($handle ne '') {
79: # Indeed, a valid token is found
80: my $start_page =
81: &Apache::loncommon::start_page('Already logged in');
82: my $end_page =
83: &Apache::loncommon::end_page();
84: $r->print(
85: $start_page
86: .'<h1>'.&mt('You are already logged in!').'</h1>'
87: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].',
88: '<a href="/adm/roles">','</a>','<a href="/adm/logout">','</a>').'</p>'
89: .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'
90: .$end_page
91: );
92: return OK;
93: }
94:
95: # ---------------------------------------------------- No valid token, continue
96:
97: # ---------------------------- Not possible to really login to domain "public"
98: if ($env{'form.domain'} eq 'public') {
99: $env{'form.domain'}='';
100: $env{'form.username'}='';
101: }
102: # ----------------------------------------------------------- Process Interface
103: $env{'form.interface'}=~s/\W//g;
104:
105: my $httpbrowser=$ENV{"HTTP_USER_AGENT"};
106:
107: my $iconpath=
108: &Apache::loncommon::lonhttpdurl($r->dir_config('lonIconsURL'));
109:
110: my $domain = &Apache::lonnet::default_login_domain();
111: if (($env{'form.domain'}) &&
112: (&Apache::lonnet::domain($env{'form.domain'},'description'))) {
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 $lonhost = $r->dir_config('lonHostID');
119: my $tabdir = $r->dir_config('lonTabDir');
120: my $include = $r->dir_config('lonIncludes');
121: my $expire = $r->dir_config('lonExpire');
122: my $version = $r->dir_config('lonVersion');
123: my $host_name = &Apache::lonnet::hostname($lonhost);
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 $otherserver= &Apache::lonnet::absolute_url($host_name);
142: my $firsturl=
143: ($env{'request.firsturl'}?$env{'request.firsturl'}:$env{'form.firsturl'});
144: # ---------------------------------------------------------- Are we overloaded?
145: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
146: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent);
147: if ($unloaded) { $otherserver=$unloaded; }
148: }
149:
150: # ----------------------------------------------------------- Get announcements
151: my $announcements=&Apache::lonnet::getannounce();
152: # -------------------------------------------------------- Set login parameters
153:
154: my @hexstr=('0','1','2','3','4','5','6','7',
155: '8','9','a','b','c','d','e','f');
156: my $lkey='';
157: for (0..7) {
158: $lkey.=$hexstr[rand(15)];
159: }
160:
161: my $ukey='';
162: for (0..7) {
163: $ukey.=$hexstr[rand(15)];
164: }
165:
166: my $lextkey=hex($lkey);
167: if ($lextkey>2147483647) { $lextkey-=4294967296; }
168:
169: my $uextkey=hex($ukey);
170: if ($uextkey>2147483647) { $uextkey-=4294967296; }
171:
172: # -------------------------------------------------------- Store away log token
173: my $logtoken=Apache::lonnet::reply(
174: 'tmpput:'.$ukey.$lkey.'&'.$firsturl,
175: $lonhost);
176:
177: # ------------------- If we cannot talk to ourselves, we are in serious trouble
178:
179: if ($logtoken eq 'con_lost') {
180: my $spares='';
181: my $last;
182: foreach my $hostid (sort
183: {
184: &Apache::lonnet::hostname($a) cmp
185: &Apache::lonnet::hostname($b);
186: }
187: keys(%Apache::lonnet::spareid)) {
188: next if ($hostid eq $lonhost);
189: my $hostname = &Apache::lonnet::hostname($hostid);
190: next if ($last eq $hostname);
191: $spares.='<br /><font size="+1"><a href="http://'.
192: $hostname.
193: '/adm/login?domain='.$authdomain.'">'.
194: $hostname.'</a>'.
195: ' '.&mt('(preferred)').'</font>'.$/;
196: $last=$hostname;
197: }
198: $spares.= '<br />';
199: my %all_hostnames = &Apache::lonnet::all_hostnames();
200: foreach my $hostid (sort
201: {
202: &Apache::lonnet::hostname($a) cmp
203: &Apache::lonnet::hostname($b);
204: }
205: keys(%all_hostnames)) {
206: next if ($hostid eq $lonhost || $Apache::lonnet::spareid{$hostid});
207: my $hostname = &Apache::lonnet::hostname($hostid);
208: next if ($last eq $hostname);
209: $spares.='<br /><a href="http://'.
210: $hostname.
211: '/adm/login?domain='.$authdomain.'">'.
212: $hostname.'</a>';
213: $last=$hostname;
214: }
215: $r->print(
216: '<html>'
217: .'<head><title>'
218: .&mt('The LearningOnline Network with CAPA')
219: .'</title></head>'
220: .'<body bgcolor="#FFFFFF">'
221: .'<h1>'.&mt('The LearningOnline Network with CAPA').'</h1>'
222: .'<img src="/adm/lonKaputt/lonlogo_broken.gif" align="right" />'
223: .'<h3>'.&mt('This LON-CAPA server is temporarily not available for login.').'</h3>'
224: .'<p>'.&mt('Please attempt to login to one of the following servers:').'</p>'
225: .$spares
226: .'</body>'
227: .'</html>'
228: );
229: return OK;
230: }
231:
232: # ----------------------------------------------- Apparently we are in business
233: $servadm=~s/\,/\<br \/\>/g;
234:
235: # ----------------------------------------------------------- Front page design
236: my $pgbg=&Apache::loncommon::designparm('login.pgbg',$domain);
237: my $font=&Apache::loncommon::designparm('login.font',$domain);
238: my $link=&Apache::loncommon::designparm('login.link',$domain);
239: my $vlink=&Apache::loncommon::designparm('login.vlink',$domain);
240: my $alink=&Apache::loncommon::designparm('login.alink',$domain);
241: my $mainbg=&Apache::loncommon::designparm('login.mainbg',$domain);
242: my $logo=&Apache::loncommon::designparm('login.logo',$domain);
243: my $img=&Apache::loncommon::designparm('login.img',$domain);
244: my $domainlogo=&Apache::loncommon::domainlogo($domain);
245: my $login=&Apache::loncommon::designparm('login.login',$domain);
246: if ($login eq '') {
247: $login = $iconpath.'/'.&mt('userauthentication.gif');
248: }
249: my $showbanner = 1;
250: my $showmainlogo = 1;
251: if (defined(&Apache::loncommon::designparm('login.showlogo_img',$domain))) {
252: $showbanner = &Apache::loncommon::designparm('login.showlogo_img',$domain);
253: }
254: if (defined(&Apache::loncommon::designparm('login.showlogo_logo',$domain))) {
255: $showmainlogo = &Apache::loncommon::designparm('login.showlogo_logo',$domain);
256: }
257: my $showadminmail=&Apache::loncommon::designparm('login.adminmail',$domain);
258: my $showcoursecat =
259: &Apache::loncommon::designparm('login.coursecatalog',$domain);
260: my $loginheader =&Apache::loncommon::designparm('login.loginheader',$domain);
261: my $shownewuserlink =
262: &Apache::loncommon::designparm('login.newuser',$domain);
263: my $now=time;
264: my $js = (<<ENDSCRIPT);
265:
266: <script type="text/javascript" language="JavaScript">
267: function send()
268: {
269: this.document.server.elements.uname.value
270: =this.document.client.elements.uname.value;
271:
272: this.document.server.elements.udom.value
273: =this.document.client.elements.udom.value;
274:
275: uextkey=this.document.client.elements.uextkey.value;
276: lextkey=this.document.client.elements.lextkey.value;
277: initkeys();
278:
279: this.document.server.elements.upass0.value
280: =crypted(this.document.client.elements.upass$now.value.substr(0,15));
281: this.document.server.elements.upass1.value
282: =crypted(this.document.client.elements.upass$now.value.substr(15,15));
283: this.document.server.elements.upass2.value
284: =crypted(this.document.client.elements.upass$now.value.substr(30,15));
285:
286: this.document.client.elements.uname.value='';
287: this.document.client.elements.upass$now.value='';
288:
289: this.document.server.submit();
290: return false;
291: }
292: </script>
293:
294: ENDSCRIPT
295:
296: # --------------------------------------------------- Print login screen header
297:
298: my %add_entries = (
299: bgcolor => "$mainbg",
300: text => "$font",
301: link => "$link",
302: vlink => "$vlink",
303: alink => "$alink",);
304:
305: $r->print(&Apache::loncommon::start_page('The LearningOnline Network with CAPA Login',$js,
306: { 'redirect' => [$expire,'/adm/roles'],
307: 'add_entries' => \%add_entries,
308: 'only_body' => 1,}));
309:
310: # ----------------------------------------------------------------------- Texts
311:
312: my %lt=&Apache::lonlocal::texthash(
313: 'un' => 'Username',
314: 'pw' => 'Password',
315: 'dom' => 'Domain',
316: 'perc' => 'percent',
317: 'load' => 'Server Load',
318: 'userload' => 'User Load',
319: 'catalog' => 'Course Catalog',
320: 'log' => 'Log in',
321: 'help' => 'Log-in Help',
322: 'serv' => 'Server',
323: 'servadm' => 'Server Administration',
324: 'helpdesk' => 'Contact Helpdesk',
325: 'forgotpw' => 'Forgot password?',
326: 'newuser' => 'New User?',
327: );
328: # -------------------------------------------------- Change password field name
329: my $forgotpw = &forgotpwdisplay(%lt);
330: my $loginhelp = &loginhelpdisplay(%lt);
331:
332: # ---------------------------------------------------- Serve out DES JavaScript
333: {
334: my $jsh=Apache::File->new($include."/londes.js");
335: $r->print(<$jsh>);
336: }
337: # ---------------------------------------------------------- Serve rest of page
338:
339: $r->print(
340: '<div class="LC_loginpage_container">');
341:
342: #
343: # If the loadbalancing yielded just http:// because perhaps there's no loadbalancing?
344: # then just us a relative link to authenticate:
345: #
346:
347: $r->print(<<ENDSERVERFORM);
348: <form name="server" action="$otherserver/adm/authenticate" method="post" target="_top">
349: <input type="hidden" name="logtoken" value="$logtoken" />
350: <input type="hidden" name="serverid" value="$lonhost" />
351: <input type="hidden" name="uname" value="" />
352: <input type="hidden" name="upass0" value="" />
353: <input type="hidden" name="upass1" value="" />
354: <input type="hidden" name="upass2" value="" />
355: <input type="hidden" name="udom" value="" />
356: <input type="hidden" name="localpath" value="$env{'form.localpath'}" />
357: <input type="hidden" name="localres" value="$env{'form.localres'}" />
358: </form>
359: ENDSERVERFORM
360: my $coursecatalog;
361: if (($showcoursecat eq '') || ($showcoursecat)) {
362: $coursecatalog = &coursecatalog_link($lt{'catalog'});
363: }
364: my $newuserlink;
365: if ($shownewuserlink) {
366: $newuserlink = &newuser_link($lt{'newuser'}).'<br />';
367: }
368: my $logintitle;
369: if ($loginheader eq 'text') {
370: $logintitle ='<h2>'.$lt{'log'}.'</h2>';
371: } else {
372: $logintitle = '<img src="'.$login.'" alt="'.
373: &mt('User Authentication').'" />';
374: }
375:
376: my $noscript_warning='<noscript><span class="LC_warning"><b>'
377: .&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.')
378: .'</b></span></noscript>';
379: my $helpdeskscript;
380: my $contactblock = &contactdisplay(\%lt,$servadm,$showadminmail,
381: $version,$authdomain,\$helpdeskscript);
382:
383: my $loginform=(<<LFORM);
384: <form name="client" onsubmit="return(send())">
385: <input type="hidden" name="lextkey" value="$lextkey" />
386: <input type="hidden" name="uextkey" value="$uextkey" />
387: <b><label for="uname">$lt{'un'}</label>:</b><br />
388: <input type="text" name="uname" size="15" value="$authusername" /><br />
389: <b><label for="upass$now">$lt{'pw'}</label>:</b><br />
390: <input type="password" name="upass$now" size="15" /><br />
391: <b><label for="udom">$lt{'dom'}</label>:</b><br />
392: <input type="text" name="udom" size="15" value="$authdomain" /><br />
393: <input type="submit" value="$lt{'log'}" />
394: </form>
395: LFORM
396:
397: if ($showbanner) {
398: $r->print(<<HEADER);
399: <!-- The LON-CAPA Header -->
400: <table border="0" align="left" width="100%" cellspacing="0" cellpadding="1">
401: <tr>
402: <td align="left" valign="top" bgcolor="$pgbg">
403: <img src="$img" border="0" alt="The Learning Online Network with CAPA" />
404: </td>
405: </tr>
406: </table>
407: HEADER
408: }
409: $r->print(<<ENDTOP);
410: <div class="LC_loginpage_space"> </div>
411: <div class="LC_loginpage_floatLeft">
412: <div class="LC_loginpage_loginContainer">
413: $logintitle
414: <table border="0" align="left" cellspacing="1" cellpadding="2" width="100%">
415: <tr>
416: <td>
417: $loginform
418: </td>
419: </tr>
420: </table>
421: $noscript_warning
422: </div>
423:
424: <div class="LC_loginpage_loginInfo">
425: $loginhelp<br />
426: $forgotpw<br />
427: $contactblock<br />
428: $newuserlink
429: $coursecatalog
430: </div>
431: </div>
432: ENDTOP
433: if ($showmainlogo) {
434: $r->print(' <img src="'.$logo.'" alt="" />'."\n");
435: }
436: $r->print(<<ENDTOP);
437: $announcements
438: $domainlogo
439: <div class="LC_loginpage_space"> </div>
440: ENDTOP
441:
442: $r->print(<<ENDDOCUMENT);
443: <table border="0" cellspacing="0" cellpadding="0">
444: <tr>
445: <td align="left" valign="top">
446: <small><b> $lt{'dom'}: </b></small>
447: </td>
448: <td align="left" valign="top">
449: <small><tt> $domain</tt></small>
450: </td>
451: </tr>
452: <tr>
453: <td align="left" valign="top">
454: <small><b> $lt{'serv'}: </b></small>
455: </td>
456: <td align="left" valign="top">
457: <small><tt> $lonhost ($role)</tt></small>
458: </td>
459: </tr>
460: <tr>
461: <td align="left" valign="top">
462: <small><b> $lt{'load'}: </b></small>
463: </td>
464: <td align="left" valign="top">
465: <small><tt> $loadpercent $lt{'perc'}</tt></small>
466: </td>
467: </tr>
468: <tr>
469: <td align="left" valign="top">
470: <small><b> $lt{'userload'}: </b></small>
471: </td>
472: <td align="left" valign="top">
473: <small><tt> $userloadpercent $lt{'perc'}</tt></small>
474: </td>
475: </tr>
476: </table>
477: </div>
478:
479: <script type="text/javascript">
480: // the if prevents the script error if the browser can not handle this
481: if ( document.client.uname ) { document.client.uname.focus(); }
482: </script>
483: $helpdeskscript
484:
485: ENDDOCUMENT
486: my %endargs = ( 'noredirectlink' => 1, );
487: $r->print(&Apache::loncommon::end_page(\%endargs));
488: return OK;
489: }
490:
491: sub contactdisplay {
492: my ($lt,$servadm,$showadminmail,$version,$authdomain,$helpdeskscript) = @_;
493: my $contactblock;
494: my $showhelpdesk = 0;
495: my $requestmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
496: if ($requestmail =~ m/^[^\@]+\@[^\@]+$/) {
497: $showhelpdesk = 1;
498: }
499: if ($servadm && $showadminmail) {
500: $contactblock .= '<b> '.$$lt{'servadm'}.':</b><br />'.
501: '<tt> '.$servadm.'</tt><br /> <br />';
502: }
503: if ($showhelpdesk) {
504: $contactblock .= '<a href="javascript:helpdesk()">'.$lt->{'helpdesk'}.'</a><br />';
505: my $thisurl = &escape('/adm/login');
506: $$helpdeskscript = <<"ENDSCRIPT";
507: <script type="text/javascript">
508: function helpdesk() {
509: var codedom = document.client.udom.value;
510: if (codedom == '') {
511: codedom = "$authdomain";
512: }
513: var querystr = "origurl=$thisurl&codedom="+codedom;
514: document.location.href = "/adm/helpdesk?"+querystr;
515: return;
516: }
517: </script>
518: ENDSCRIPT
519: }
520: $contactblock .= <<"ENDBLOCK";
521: $version
522: ENDBLOCK
523: return $contactblock;
524: }
525:
526: sub forgotpwdisplay {
527: my (%lt) = @_;
528: my $prompt_for_resetpw = 1;
529: if ($prompt_for_resetpw) {
530: return '<a href="/adm/resetpw">'.$lt{'forgotpw'}.'</a>';
531: }
532: return;
533: }
534:
535: sub loginhelpdisplay {
536: my (%lt) = @_;
537: my $login_help = 1;
538: if ($login_help) {
539: return '<a href="/adm/loginproblems.html">'.$lt{'help'}.'</a>';
540: }
541: return;
542: }
543:
544: sub coursecatalog_link {
545: my ($linkname) = @_;
546: return <<"END";
547: <a href="/adm/coursecatalog">$linkname</a>
548: END
549: }
550:
551: sub newuser_link {
552: my ($linkname) = @_;
553: return ' <a href="/adm/createaccount"><b>'.$linkname.'</b></a><br />';
554: }
555:
556: 1;
557: __END__
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