Annotation of loncom/interface/lonpreferences.pm, revision 1.4
1.1 www 1: # The LearningOnline Network
2: # Preferences
3: #
1.4 ! matthew 4: # $Id: lonpreferences.pm,v 1.3 2002/02/15 22:04:39 matthew Exp $
1.2 albertel 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: #
1.1 www 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: #
1.3 matthew 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:
1.1 www 45: package Apache::lonpreferences;
46:
47: use strict;
48: use Apache::Constants qw(:common);
1.3 matthew 49: use Apache::File;
50: use Crypt::DES;
51: use DynaLoader; # for Crypt::DES version
1.4 ! matthew 52: use Apache::loncommon();
1.3 matthew 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 {
1.4 ! matthew 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.
1.3 matthew 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))));
1.4 ! matthew 94: $plaintext=substr($plaintext,1,ord(substr($plaintext,0,1)) );
1.3 matthew 95: return $plaintext;
96: }
97:
1.4 ! matthew 98: ################################################################
! 99: # Handler subroutines #
! 100: ################################################################
! 101:
! 102: ######################################################
! 103: # password handler subroutines #
! 104: ######################################################
1.3 matthew 105: sub passwordchanger {
1.4 ! matthew 106: # This function is a bit of a mess....
1.3 matthew 107: # Passwords are encrypted using londes.js (DES encryption)
108: my $r = shift;
1.4 ! matthew 109: my $errormessage = shift;
! 110: $errormessage = ($errormessage || '');
1.3 matthew 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();
1.4 ! matthew 122: # Store the keys in the log files
1.3 matthew 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);
1.4 ! matthew 129: # Hexify the keys for output as javascript variables
1.3 matthew 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
1.4 ! matthew 137: # Output DES javascript
1.3 matthew 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();">
1.1 www 146:
1.3 matthew 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>
1.4 ! matthew 175: $errormessage
1.3 matthew 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="" />
1.4 ! matthew 188: <input type="hidden" name="newpass_1" value="" />
! 189: <input type="hidden" name="newpass_2" value="" />
1.3 matthew 190: </form>
191:
192: <form name="client" >
193: <table>
1.4 ! matthew 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>
1.3 matthew 200: <tr><td colspan="2" align="center">
201: <input type="button" value="Change Password" onClick="send();">
202: </table>
1.4 ! matthew 203: <input type="hidden" name="ukey_cpass" value="$ukey_cpass" />
! 204: <input type="hidden" name="lkey_cpass" value="$lkey_cpass" />
1.3 matthew 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,$domain);
1.4 ! matthew 222: # Check for authentication types that allow changing of the password.
! 223: return if ($currentauth !~ /^(unix|internal):/);
1.3 matthew 224: #
1.4 ! matthew 225: $r->print(<<ENDHEADER);
! 226: <html>
! 227: <head>
! 228: <title>LON-CAPA Preferences: Change password for $user</title>
! 229: </head>
! 230: ENDHEADER
1.3 matthew 231: #
232: my $currentpass = $ENV{'form.currentpass'};
233: my $newpass1 = $ENV{'form.newpass_1'};
234: my $newpass2 = $ENV{'form.newpass_2'};
235: my $logtoken = $ENV{'form.logtoken'};
236: # Check for empty data
1.4 ! matthew 237: unless (defined($currentpass) &&
! 238: defined($newpass1) &&
! 239: defined($newpass2) ){
! 240: &passwordchanger($r,"<p>\n<font color='#ff0000'>ERROR</font>".
! 241: "Password data was blank.\n</p>");
1.3 matthew 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')) {
1.4 ! matthew 248: # I do not a have a better idea about how to handle this
1.3 matthew 249: $r->print(<<ENDERROR);
250: <p>
251: <font color="#ff0000">ERROR:</font> Unable to retrieve stored token for
1.4 ! matthew 252: password decryption. Please log out and try again.
1.3 matthew 253: </p>
254: ENDERROR
1.4 ! matthew 255: # Probably should log an error here
1.3 matthew 256: return;
257: }
258: my ($ckey,$n1key,$n2key)=split(/&/,$tmpinfo);
1.4 ! matthew 259: #
1.3 matthew 260: my $currentpass = &des_decrypt($ckey ,$currentpass);
261: my $newpass1 = &des_decrypt($n1key,$newpass1);
262: my $newpass2 = &des_decrypt($n2key,$newpass2);
1.4 ! matthew 263: #
1.3 matthew 264: if ($newpass1 ne $newpass2) {
1.4 ! matthew 265: &passwordchanger($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.');
1.3 matthew 276: return;
277: }
1.4 ! matthew 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;
1.3 matthew 314: }
315:
1.4 ! matthew 316: ######################################################
! 317: # other handler subroutines #
! 318: ######################################################
! 319:
! 320:
1.3 matthew 321: ################################################################
322: # Main handler #
323: ################################################################
1.1 www 324: sub handler {
325: my $r = shift;
1.3 matthew 326: my $user = $ENV{'user.name'};
327: my $domain = $ENV{'user.domain'};
1.1 www 328: $r->content_type('text/html');
1.4 ! matthew 329: # Some pages contain DES keys and should not be cached.
! 330: &Apache::loncommon::no_cache($r);
1.1 www 331: $r->send_http_header;
332: return OK if $r->header_only;
1.3 matthew 333: # Spit out the header
334: if ($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);
1.1 www 340: <html>
341: <head>
1.4 ! matthew 342: <title>LON-CAPA Preferences</title>
1.1 www 343: </head>
1.3 matthew 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):/) {
1.4 ! matthew 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
1.3 matthew 358: }
359: }
360: $r->print(<<ENDFOOTER);
1.1 www 361: </body>
362: </html>
1.3 matthew 363: ENDFOOTER
1.1 www 364: return OK;
365: }
366:
367: 1;
368: __END__
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