1: # The LearningOnline Network
2: # Login Screen
3: #
4: # $Id: lonlogin.pm,v 1.32 2003/02/17 23:25:59 www 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: # 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14,
29: # 1/14/00,5/29,5/30,6/1,6/29,7/1,11/9,
30: # 1/17/01 Gerd Kortemeyer
31: #
32: # 2/7/02,2/8,2/12,2/14,2/15,2/19 Josh Brunskole
33: #
34: # 7/10/02 Jeremy Bowers
35:
36: package Apache::lonlogin;
37:
38: use strict;
39: use Apache::Constants qw(:common);
40: use Apache::File ();
41: use Apache::lonnet();
42: use Apache::loncommon();
43:
44: sub handler {
45: my $r = shift;
46: $r->content_type('text/html');
47: &Apache::loncommon::no_cache($r);
48: $r->send_http_header;
49: return OK if $r->header_only;
50:
51:
52: &Apache::loncommon::get_unprocessed_cgi
53: ($ENV{'QUERY_STRING'},['interface','username','domain','firsturl']);
54:
55: # ----------------------------------------------------------- Process Interface
56: $ENV{'form.interface'}=~s/\W//g;
57:
58: my $textbrowsers=$r->dir_config('lonTextBrowsers');
59: my $httpbrowser=$ENV{"HTTP_USER_AGENT"};
60:
61: foreach (split(/\:/,$textbrowsers)) {
62: if ($httpbrowser=~/$_/i) {
63: $ENV{'form.interface'}='textual';
64: }
65: }
66:
67: my $fullgraph=($ENV{'form.interface'} ne 'textual');
68:
69: my $iconpath= 'http://'.$ENV{'HTTP_HOST'}.':8080'.
70: $r->dir_config('lonIconsURL');
71: my $domain = $r->dir_config('lonDefDomain');
72: my $role = $r->dir_config('lonRole');
73: my $loadlim = $r->dir_config('lonLoadLim');
74: my $servadm = $r->dir_config('lonAdmEMail');
75: my $sysadm = $r->dir_config('lonSysEMail');
76: my $lonhost = $r->dir_config('lonHostID');
77: my $tabdir = $r->dir_config('lonTabDir');
78: my $include = $r->dir_config('lonIncludes');
79:
80: # --------------------------------------------- Default values for login fields
81:
82: my $authusername=($ENV{'form.username'}?$ENV{'form.username'}:'');
83: my $authdomain=($ENV{'form.domain'}?$ENV{'form.domain'}:$domain);
84:
85: # ---------------------------------------------------------- Determine own load
86: my $loadavg;
87: {
88: my $loadfile=Apache::File->new('/proc/loadavg');
89: $loadavg=<$loadfile>;
90: }
91: $loadavg =~ s/\s.*//g;
92: my $loadpercent=100*$loadavg/$loadlim;
93:
94: # ------------------------------------------------------- Do the load balancing
95: my $otherserver='http://'.$ENV{'SERVER_NAME'};
96: my $firsturl=
97: ($ENV{'request.firsturl'}?$ENV{'request.firsturl'}:$ENV{'form.firsturl'});
98: # ---------------------------------------- Are we access server and overloaded?
99: if (($role eq 'access') && ($loadpercent>100.0)) {
100: $otherserver=Apache::lonnet::spareserver($loadpercent);
101: }
102:
103: # -------------------------------------------------------- Set login parameters
104:
105: my @hexstr=('0','1','2','3','4','5','6','7',
106: '8','9','a','b','c','d','e','f');
107: my $lkey='';
108: for (0..7) {
109: $lkey.=$hexstr[rand(15)];
110: }
111:
112: my $ukey='';
113: for (0..7) {
114: $ukey.=$hexstr[rand(15)];
115: }
116:
117: my $lextkey=hex($lkey);
118: if ($lextkey>2147483647) { $lextkey-=4294967296; }
119:
120: my $uextkey=hex($ukey);
121: if ($uextkey>2147483647) { $uextkey-=4294967296; }
122:
123: # -------------------------------------------------------- Store away log token
124: my $logtoken=Apache::lonnet::reply(
125: 'tmpput:'.$ukey.$lkey.'&'.$firsturl,
126: $lonhost);
127:
128: # ------------------- If we cannot talk to ourselves, we are in serious trouble
129:
130: if ($logtoken eq 'con_lost') {
131: my $spares='';
132: foreach (keys %Apache::lonnet::hostname) {
133: if ($_ ne $lonhost) {
134: $spares.='<br /><a href="http://'.$Apache::lonnet::hostname{$_}.
135: '/adm/login?domain='.$authdomain.'">'.
136: $Apache::lonnet::hostname{$_}.'</a>';
137: if ($Apache::lonnet::spareid{$_}) {
138: $spares.=' (preferred)';
139: }
140: }
141: }
142: $r->print(<<ENDTROUBLE);
143: <html>
144: <head><title>The LearningOnline Network with CAPA</title></head>
145: <body bgcolor="#FFFFFF">
146: <img src="/adm/lonKaputt/lonlogo_broken.gif" align="right" />
147: <h3>This LON-CAPA server is temporarily not available for login</h3>
148: <p>Please attempt to login to one of the following servers:</p>$spares
149: <p>If the problem persists, please contact <tt>$servadm</tt>.</p>
150: </body>
151: </html>
152: ENDTROUBLE
153: return OK;
154: }
155:
156: # ----------------------------------------------- Apparently we are in business
157:
158: my $domainlogo=&Apache::loncommon::domainlogo();
159: # --------------------------------------------------- Print login screen header
160: $r->print(<<ENDHEADER);
161: <html>
162: <head>
163: <title>The LearningOnline Network with CAPA Login</title>
164: </head>
165: ENDHEADER
166: # ---------------------------------------------------- Serve out DES JavaScript
167: {
168: my $jsh=Apache::File->new($include."/londes.js");
169: $r->print(<$jsh>);
170: }
171:
172: # ----------------------------------------------------------- Front page design
173: my $pgbg=&Apache::loncommon::designparm('login.pgbg');
174: my $font=&Apache::loncommon::designparm('login.font');
175: my $link=&Apache::loncommon::designparm('login.link');
176: my $vlink=&Apache::loncommon::designparm('login.vlink');
177: my $alink=&Apache::loncommon::designparm('login.alink');
178: my $mainbg=&Apache::loncommon::designparm('login.mainbg');
179: my $sidebg=&Apache::loncommon::designparm('login.sidebg');
180: my $logo=&Apache::loncommon::designparm('login.logo');
181: my $img=&Apache::loncommon::designparm('login.img');
182:
183:
184: # ---------------------------------------------------------- Serve rest of page
185: $r->print(<<ENDSCRIPT);
186:
187: <body bgcolor="$pgbg" text="$font" link="$link" vlink="$vlink" alink="$alink"
188: topmargin=0 leftmargin=0 marginwidth=0 marginheight=0>
189:
190: <script language="JavaScript">
191: function send()
192: {
193: this.document.server.elements.uname.value
194: =this.document.client.elements.uname.value;
195:
196: this.document.server.elements.udom.value
197: =this.document.client.elements.udom.value;
198:
199: uextkey=this.document.client.elements.uextkey.value;
200: lextkey=this.document.client.elements.lextkey.value;
201: initkeys();
202:
203: this.document.server.elements.upass.value
204: =crypted(this.document.client.elements.upass.value);
205:
206: this.document.server.submit();
207: return false;
208: }
209: </script>
210: ENDSCRIPT
211:
212: if ($fullgraph) {
213: $r->print(
214: '<table width="100%" cellpadding=0 cellspacing=0 border=0>');
215: }
216:
217: $r->print(<<ENDSERVERFORM);
218: <form name="server" action="$otherserver/adm/authenticate" method="post" target="_top">
219: <input type=hidden name=logtoken value="$logtoken">
220: <input type=hidden name=serverid value="$lonhost">
221: <input type=hidden name=interface value="$ENV{'form.interface'}">
222: <input type=hidden name=uname value="">
223: <input type=hidden name=upass value="">
224: <input type=hidden name=udom value="">
225: </form>
226: ENDSERVERFORM
227: if ($fullgraph) { $r->print(<<ENDTOP);
228: <!-- The LON-CAPA Header -->
229: <tr>
230:
231: <!-- Row 1 Columns 2-4 -->
232: <td width="100%" height=75 colspan=4 align="left" valign="top" bgcolor="$pgbg"><img src="$img" border=0 alt="The Learning Online Network with CAPA" /></td>
233: </tr>
234:
235: <!-- The gray bar that starts the two table frames -->
236: <tr>
237:
238: <!-- Row 2 Column 1 -->
239: <td width=182 height=27 bgcolor="$sidebg"> </td>
240:
241: <!-- Row 2 Column 2 -->
242: <td width=27 height=27 align="left" background="$iconpath/filltop.gif"><img src="$iconpath/upperleft.gif" border=0 alt="" /></td>
243:
244: <!-- Row 2 Column 3 -->
245: <td height=27 background="$iconpath/filltop.gif"><img src="$iconpath/filltop.gif" alt="" /></td>
246:
247: <!-- Row 2 Column 4 -->
248: <td width=27 height=27 align="right" background="$iconpath/filltop.gif"><img src="$iconpath/upperright.gif" border=0 alt="" /></td>
249: </tr>
250: <tr>
251:
252: <!-- A cell that will hold the 'access' and 'about' buttons -->
253: <!-- Row 3 Column 1 -->
254: <td valign="top" height=60 align="center" bgcolor="$sidebg">
255: <a href="/adm/login?interface=textual"><img src="$iconpath/accessbutton.gif" border=0 alt="Accessibility Options" /></a>
256: <br />
257: <a href="/adm/about.html"><img src="$iconpath/aboutlon.gif" border=0 alt="About LON-CAPA" /></a>
258: </td>
259:
260: <!-- The shaded space between the two main columns -->
261: <!-- Row 3 Column 2 -->
262: <td width=27 height=60 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
263:
264: <!-- The right main column holding the large LON-CAPA logo-->
265: <!-- Rows 3-4 Column 3 -->
266: <td align="center" valign="top" width="100%" height="100%" rowspan=2 bgcolor="$mainbg">
267: <center>
268: <img src="$logo" alt="" />
269: </center>
270: </td>
271:
272: <!-- Row 3 Column 4 -->
273: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
274: </tr>
275: <tr>
276:
277: <!-- The entry form -->
278: <!-- Row 4 Column 1 -->
279: <td align="center" valign="middle" bgcolor="$sidebg">
280: ENDTOP
281: } else {
282: $r->print('<font color="#FFFFFF"><h1>The Learning<i>Online</i> Network with CAPA</h1><h3>Text-based Interface Login</h3></font>');
283: }
284: $r->print(<<ENDLOGIN);
285: <form name="client" onsubmit="return(send())">
286: <input type="hidden" name="lextkey" value="$lextkey">
287: <input type="hidden" name="uextkey" value="$uextkey">
288:
289: <!-- Start the sub-table for text and input alignment -->
290: <table border=0 cellspacing=0 cellpadding=0>
291: <tr><td bgcolor="$sidebg" colspan=2><img src="$iconpath/userauthentication.gif" alt="User Authentication" /></td></tr>
292: <tr>
293: <td bgcolor="$mainbg"><br /><font size=-1><b> User Name:</b></font></td>
294: <td bgcolor="$mainbg"><br /><input type="text" name="uname" size="10" value="$authusername" /></td>
295: </tr>
296: <tr>
297: <td bgcolor="$mainbg"><font size=-1><b> Password:</b></font></td>
298: <td bgcolor="$mainbg"><input type="password" name="upass" size="10" /></td>
299: </tr>
300: <tr>
301: <td bgcolor="$mainbg"><font size=-1><b> Domain:</b></font></td>
302: <td bgcolor="$mainbg"><input type="text" name="udom" size="10" value="$authdomain" /></td>
303: </tr>
304: <tr>
305: <td bgcolor="$mainbg"> <a href="/adm/loginproblems.html">Help</a></td>
306: <td bgcolor="$mainbg" valign="bottom" align="center">
307: <br />
308: <input type="submit" value="Log In" />
309: </td>
310: </tr>
311: </table>
312: <!-- End sub-table -->
313: </form>
314: ENDLOGIN
315: if ($fullgraph) {
316: $r->print(<<ENDDOCUMENT);
317: </td>
318:
319: <!-- Row 4 Column 2 -->
320: <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
321:
322: <!-- Row 4 Column 4 -->
323: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
324: </tr>
325: <tr>
326:
327: <!-- Row 5 Column 1 -->
328: <td bgcolor="$sidebg" valign="middle" align="left">
329: <br />
330: <table border=0 cellspacing=0 cellpadding=0>
331: <tr>
332: <td bgcolor="$sidebg" align="left" valign="top">
333: <small><b> Domain: </b></small>
334: </td>
335: <td bgcolor="$sidebg" align="left" valign="top">
336: <small><tt> $domain</tt></small>
337: </td>
338: </tr>
339: <tr>
340: <td bgcolor="$sidebg" align="left" valign="top">
341: <small><b> Server: </b></small>
342: </td>
343: <td bgcolor="$sidebg" align="left" valign="top">
344: <small><tt> $lonhost ($role)</tt></small>
345: </td>
346: </tr>
347: <tr>
348: <td bgcolor="$sidebg" align="left" valign="top">
349: <small><b> Load: </b></small>
350: </td>
351: <td bgcolor="$sidebg" align="left" valign="top">
352: <small><tt> $loadpercent percent</tt></small>
353: </td>
354: </tr>
355: </table>
356: <br />
357: <small>
358: <b> System Administration:</b><br />
359: <tt> $sysadm</tt><br />
360: <b> Server Administration:</b><br />
361: <tt> $servadm<br /> </tt>
362: </small>
363: </td>
364:
365: <!-- Row 5 Column 2 -->
366: <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
367:
368: <!-- Row 5 Column 3 -->
369: <td width="100%" valign="bottom" bgcolor="$mainbg">
370: $domainlogo
371: </td>
372:
373: <!-- Row 5 Column 4 -->
374: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
375: </tr>
376: <tr>
377:
378: <!-- Row 6 Column 1 -->
379: <td bgcolor="$sidebg"> </td>
380:
381: <!-- Row 6 Column 2 -->
382: <td align="left" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerleft.gif" alt="" /></td>
383:
384: <!-- Row 6 Column 3 -->
385: <td background="$iconpath/fillbottom.gif"><img src="$iconpath/fillbottom.gif" alt="" /></td>
386:
387: <!-- Row 6 Column 4 -->
388: <td align="right" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerright.gif" alt="" /></td>
389: </tr>
390: </table>
391:
392: <script>
393: // the if prevents the script error if the browser can't handle this
394: if ( document.client.uname ) { document.client.uname.focus(); }
395: </script>
396:
397: ENDDOCUMENT
398: }
399: $r->print('</body></html>');
400: return OK;
401: }
402:
403: 1;
404: __END__
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