1: # The LearningOnline Network
2: # Preferences
3: #
4: # $Id: lonpreferences.pm,v 1.4 2002/02/19 21:50:40 matthew 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: # (Internal Server Error Handler
29: #
30: # (Login Screen
31: # 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14,
32: # 1/14/00,5/29,5/30,6/1,6/29,7/1,11/9 Gerd Kortemeyer)
33: #
34: # 3/1/1 Gerd Kortemeyer)
35: #
36: # 3/1 Gerd Kortemeyer
37: #
38: # 2/13/02 2/14 2/15 Matthew Hall
39: #
40: # This package uses the "londes.js" javascript code.
41: #
42: # TODOs that have to be completed:
43: # interface with lonnet to change the password
44:
45: package Apache::lonpreferences;
46:
47: use strict;
48: use Apache::Constants qw(:common);
49: use Apache::File;
50: use Crypt::DES;
51: use DynaLoader; # for Crypt::DES version
52: use Apache::loncommon();
53:
54: #
55: # Write lonnet::passwd to do the call below.
56: # Use:
57: # my $answer=reply("encrypt:passwd:$udom:$uname:$upass",$tryserver);
58: #
59: ##################################################
60: # password associated functions #
61: ##################################################
62: sub des_keys {
63: # Make a new key for DES encryption.
64: # Each key has two parts which are returned seperately.
65: # Please note: Each key must be passed through the &hex function
66: # before it is output to the web browser. The hex versions cannot
67: # be used to decrypt.
68: my @hexstr=('0','1','2','3','4','5','6','7',
69: '8','9','a','b','c','d','e','f');
70: my $lkey='';
71: for (0..7) {
72: $lkey.=$hexstr[rand(15)];
73: }
74: my $ukey='';
75: for (0..7) {
76: $ukey.=$hexstr[rand(15)];
77: }
78: return ($lkey,$ukey);
79: }
80:
81: sub des_decrypt {
82: my ($key,$cyphertext) = @_;
83: my $keybin=pack("H16",$key);
84: my $cypher;
85: if ($Crypt::DES::VERSION>=2.03) {
86: $cypher=new Crypt::DES $keybin;
87: } else {
88: $cypher=new DES $keybin;
89: }
90: my $plaintext=
91: $cypher->decrypt(unpack("a8",pack("H16",substr($cyphertext,0,16))));
92: $plaintext.=
93: $cypher->decrypt(unpack("a8",pack("H16",substr($cyphertext,16,16))));
94: $plaintext=substr($plaintext,1,ord(substr($plaintext,0,1)) );
95: return $plaintext;
96: }
97:
98: ################################################################
99: # Handler subroutines #
100: ################################################################
101:
102: ######################################################
103: # password handler subroutines #
104: ######################################################
105: sub passwordchanger {
106: # This function is a bit of a mess....
107: # Passwords are encrypted using londes.js (DES encryption)
108: my $r = shift;
109: my $errormessage = shift;
110: $errormessage = ($errormessage || '');
111: my $user = $ENV{'user.name'};
112: my $domain = $ENV{'user.domain'};
113: my $homeserver = $ENV{'user.home'};
114: my $currentauth=&Apache::lonnet::queryauthenticate($user,$domain);
115: # Check for authentication types that allow changing of the password.
116: return if ($currentauth !~ /^(unix|internal):/);
117: #
118: # Generate keys
119: my ($lkey_cpass ,$ukey_cpass ) = &des_keys();
120: my ($lkey_npass1,$ukey_npass1) = &des_keys();
121: my ($lkey_npass2,$ukey_npass2) = &des_keys();
122: # Store the keys in the log files
123: my $lonhost = $r->dir_config('lonHostID');
124: my $logtoken=Apache::lonnet::reply('tmpput:'
125: .$ukey_cpass . $lkey_cpass .'&'
126: .$ukey_npass1 . $lkey_npass1.'&'
127: .$ukey_npass2 . $lkey_npass2,
128: $lonhost);
129: # Hexify the keys for output as javascript variables
130: $ukey_cpass = hex($ukey_cpass);
131: $lkey_cpass = hex($lkey_cpass);
132: $ukey_npass1= hex($ukey_npass1);
133: $lkey_npass1= hex($lkey_npass1);
134: $ukey_npass2= hex($ukey_npass2);
135: $lkey_npass2= hex($lkey_npass2);
136: # Output javascript to deal with passwords
137: # Output DES javascript
138: {
139: my $include = $r->dir_config('lonIncludes');
140: my $jsh=Apache::File->new($include."/londes.js");
141: $r->print(<$jsh>);
142: }
143: $r->print(<<ENDFORM);
144:
145: <body bgcolor="#FFFFFF" onLoad="init();">
146:
147: <script language="JavaScript">
148:
149: function send() {
150: uextkey=this.document.client.elements.ukey_cpass.value;
151: lextkey=this.document.client.elements.lkey_cpass.value;
152: initkeys();
153:
154: this.document.server.elements.currentpass.value
155: =crypted(this.document.client.elements.currentpass.value);
156:
157: uextkey=this.document.client.elements.ukey_npass1.value;
158: lextkey=this.document.client.elements.lkey_npass1.value;
159: initkeys();
160: this.document.server.elements.newpass_1.value
161: =crypted(this.document.client.elements.newpass_1.value);
162:
163: uextkey=this.document.client.elements.ukey_npass2.value;
164: lextkey=this.document.client.elements.lkey_npass2.value;
165: initkeys();
166: this.document.server.elements.newpass_2.value
167: =crypted(this.document.client.elements.newpass_2.value);
168:
169: this.document.server.submit();
170: }
171:
172: </script>
173: <h1>Preferences for $user</h1>
174: <h3>$user is a member of domain $domain</h3>
175: $errormessage
176: <p>
177: Change password for $user
178: </p>
179: <p>
180: <!-- We seperate the forms into 'server' and 'client' in order to
181: ensure that unencrypted passwords will not be sent out by a
182: crappy browser -->
183:
184: <form name="server" action="/adm/preferences" method="post">
185: <input type="hidden" name="logtoken" value="$logtoken" />
186: <input type="hidden" name="action" value="verify_and_change_pass" />
187: <input type="hidden" name="currentpass" value="" />
188: <input type="hidden" name="newpass_1" value="" />
189: <input type="hidden" name="newpass_2" value="" />
190: </form>
191:
192: <form name="client" >
193: <table>
194: <tr><td align="right"> Current password: </td>
195: <td><input type="password" name="currentpass" size="10"/> </td></tr>
196: <tr><td align="right"> New password: </td>
197: <td><input type="password" name="newpass_1" size="10" /> </td></tr>
198: <tr><td align="right"> Confirm password: </td>
199: <td><input type="password" name="newpass_2" size="10" /> </td></tr>
200: <tr><td colspan="2" align="center">
201: <input type="button" value="Change Password" onClick="send();">
202: </table>
203: <input type="hidden" name="ukey_cpass" value="$ukey_cpass" />
204: <input type="hidden" name="lkey_cpass" value="$lkey_cpass" />
205: <input type="hidden" name="ukey_npass1" value="$ukey_npass1" />
206: <input type="hidden" name="lkey_npass1" value="$lkey_npass1" />
207: <input type="hidden" name="ukey_npass2" value="$ukey_npass2" />
208: <input type="hidden" name="lkey_npass2" value="$lkey_npass2" />
209: </form>
210: </p>
211: ENDFORM
212: #
213: return;
214: }
215:
216: sub verify_and_change_password {
217: my $r = shift;
218: my $user = $ENV{'user.name'};
219: my $domain = $ENV{'user.domain'};
220: my $homeserver = $ENV{'user.home'};
221: my $currentauth=&Apache::lonnet::queryauthenticate($user,$domain);
222: # Check for authentication types that allow changing of the password.
223: return if ($currentauth !~ /^(unix|internal):/);
224: #
225: $r->print(<<ENDHEADER);
226: <html>
227: <head>
228: <title>LON-CAPA Preferences: Change password for $user</title>
229: </head>
230: ENDHEADER
231: #
232: my $currentpass = $ENV{'form.currentpass'};
233: my $newpass1 = $ENV{'form.newpass_1'};
234: my $newpass2 = $ENV{'form.newpass_2'};
235: my $logtoken = $ENV{'form.logtoken'};
236: # Check for empty data
237: unless (defined($currentpass) &&
238: defined($newpass1) &&
239: defined($newpass2) ){
240: &passwordchanger($r,"<p>\n<font color='#ff0000'>ERROR</font>".
241: "Password data was blank.\n</p>");
242: return;
243: }
244: # Get the keys
245: my $lonhost = $r->dir_config('lonHostID');
246: my $tmpinfo = Apache::lonnet::reply('tmpget:'.$logtoken,$lonhost);
247: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
248: # I do not a have a better idea about how to handle this
249: $r->print(<<ENDERROR);
250: <p>
251: <font color="#ff0000">ERROR:</font> Unable to retrieve stored token for
252: password decryption. Please log out and try again.
253: </p>
254: ENDERROR
255: # Probably should log an error here
256: return;
257: }
258: my ($ckey,$n1key,$n2key)=split(/&/,$tmpinfo);
259: #
260: my $currentpass = &des_decrypt($ckey ,$currentpass);
261: my $newpass1 = &des_decrypt($n1key,$newpass1);
262: my $newpass2 = &des_decrypt($n2key,$newpass2);
263: #
264: if ($newpass1 ne $newpass2) {
265: &passwordchanger($r,
266: '<font color="#ff0000">ERROR:</font>'.
267: 'The new passwords you entered do not match. '.
268: 'Please try again.');
269: return;
270: }
271: if (length($newpass1) < 7) {
272: &passwordchanger($r,
273: '<font color="#ff0000">ERROR:</font>'.
274: 'Passwords must be a minimum of 7 characters long. '.
275: 'Please try again.');
276: return;
277: }
278: #
279: # Check for bad characters
280: my $badpassword = 0;
281: foreach (split(//,$newpass1)) {
282: $badpassword = 1 if ((ord($_)<32)||(ord($_)>126));
283: }
284: if ($badpassword) {
285: # I can't figure out how to enter bad characters on my browser.
286: &passwordchanger($r,<<ENDERROR);
287: <font color="#ff0000">ERROR:</font>
288: The password you entered contained illegal characters.<br />
289: Valid characters are: space and <br />
290: <pre>
291: !"\#$%&\'()*+,-./0123456789:;<=>?\@
292: ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_\`abcdefghijklmnopqrstuvwxyz{|}~
293: </pre>
294: ENDERROR
295: }
296: #
297: # Change the password (finally)
298: my $result = &Apache::lonnet::changepass
299: ($user,$domain,$currentpass,$newpass1,$homeserver);
300: # Inform the user the password has (not?) been changed
301: if ($result =~ /^ok$/) {
302: $r->print(<<"ENDTEXT");
303: <h2>Password for $user was successfully changed</h2>
304: ENDTEXT
305: } else {
306: # error error: run in circles, scream and shout
307: $r->print(<<ENDERROR);
308: <h2><font color="#ff0000">Password for $user was not changed</font></h2>
309: There was an internal error when attempting to change your password.
310: Please contact your instructor or the domain coordinator.
311: ENDERROR
312: }
313: return;
314: }
315:
316: ######################################################
317: # other handler subroutines #
318: ######################################################
319:
320:
321: ################################################################
322: # Main handler #
323: ################################################################
324: sub handler {
325: my $r = shift;
326: my $user = $ENV{'user.name'};
327: my $domain = $ENV{'user.domain'};
328: $r->content_type('text/html');
329: # Some pages contain DES keys and should not be cached.
330: &Apache::loncommon::no_cache($r);
331: $r->send_http_header;
332: return OK if $r->header_only;
333: # Spit out the header
334: if ($ENV{'form.action'} eq 'changepass') {
335: &passwordchanger($r);
336: } elsif ($ENV{'form.action'} eq 'verify_and_change_pass') {
337: &verify_and_change_password($r);
338: } else {
339: $r->print(<<ENDHEADER);
340: <html>
341: <head>
342: <title>LON-CAPA Preferences</title>
343: </head>
344: <body bgcolor="#FFFFFF" >
345: <h1>Preferences for $user</h1>
346: <h3>$user is a member of domain $domain</h3>
347: ENDHEADER
348: # Determine current authentication method
349: my $currentauth=&Apache::lonnet::queryauthenticate($user,$domain);
350: if ($currentauth =~ /^(unix|internal):/) {
351: $r->print(<<ENDPASSWORDFORM);
352: <form name="client" action="/adm/preferences" method="post">
353: <input type="hidden" name="action" value="changepass">
354: <input type="submit" value="Change password">
355: </form>
356: ENDPASSWORDFORM
357: # Other preference setting code should be added here
358: }
359: }
360: $r->print(<<ENDFOOTER);
361: </body>
362: </html>
363: ENDFOOTER
364: return OK;
365: }
366:
367: 1;
368: __END__
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