1: # The LearningOnline Network
2: # Cookie Based Access Handler for Construction Area
3: # (lonacc: 5/21/99,5/22,5/29,5/31 Gerd Kortemeyer)
4: #
5: # $Id: loncacc.pm,v 1.18 2001/12/21 16:57:54 harris41 Exp $
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29: # YEAR=2000
30: # 6/15,16/11,22/11,
31: # YEAR=2001
32: # 01/06,01/11,6/1,9/25,9/28,11/22,12/25,12/26,
33: # 01/06/01,05/04,05/05,05/09 Gerd Kortemeyer
34: # 12/21 Scott Harrison
35: #
36: ###
37:
38: package Apache::loncacc;
39:
40: use strict;
41: use Apache::Constants qw(:common :http :methods);
42: use Apache::File;
43: use CGI::Cookie();
44: use Fcntl qw(:flock);
45:
46: sub constructaccess {
47: my ($url,$ownerdomain)=@_;
48: my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)(\w+)/);
49: unless (($ownername) && ($ownerdomain)) { return ''; }
50:
51: if (($ownername eq $ENV{'user.name'}) &&
52: ($ownerdomain eq $ENV{'user.domain'})) {
53: return ($ownername,$ownerdomain);
54: }
55:
56: my $capriv='user.priv.ca./'.
57: $ownerdomain.'/'.$ownername.'./'.
58: $ownerdomain.'/'.$ownername;
59: foreach (keys %ENV) {
60: if ($_ eq $capriv) {
61: return ($ownername,$ownerdomain);
62: }
63: }
64:
65: return '';
66: }
67:
68: sub handler {
69: my $r = shift;
70: my $requrl=$r->uri;
71: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
72: my $lonid=$cookies{'lonID'};
73: my $cookie;
74: if ($lonid) {
75: my $handle=$lonid->value;
76: $handle=~s/\W//g;
77: my $lonidsdir=$r->dir_config('lonIDsDir');
78: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
79: my @profile;
80: {
81: my $idf=Apache::File->new("$lonidsdir/$handle.id");
82: flock($idf,LOCK_SH);
83: @profile=<$idf>;
84: $idf->close();
85: }
86: my $envi;
87: for ($envi=0;$envi<=$#profile;$envi++) {
88: chomp($profile[$envi]);
89: my ($envname,$envvalue)=split(/=/,$profile[$envi]);
90: $ENV{$envname} = $envvalue;
91: }
92: $ENV{'user.environment'} = "$lonidsdir/$handle.id";
93: $ENV{'request.state'} = "construct";
94: $ENV{'request.filename'} = $r->filename;
95:
96: unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {
97: $r->log_reason("Unauthorized $requrl", $r->filename);
98: return HTTP_NOT_ACCEPTABLE;
99: }
100:
101: # -------------------------------------------------------- Load POST parameters
102:
103:
104: my $buffer;
105:
106: $r->read($buffer,$r->header_in('Content-length'));
107:
108: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
109: my @pairs=split(/&/,$buffer);
110: my $pair;
111: foreach $pair (@pairs) {
112: my ($name,$value) = split(/=/,$pair);
113: $value =~ tr/+/ /;
114: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
115: $name =~ tr/+/ /;
116: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
117: $ENV{"form.$name"}=$value;
118: }
119: } else {
120: my $contentsep=$1;
121: my @lines = split (/\n/,$buffer);
122: my $name='';
123: my $value='';
124: my $fname='';
125: my $fmime='';
126: my $i;
127: for ($i=0;$i<=$#lines;$i++) {
128: if ($lines[$i]=~/^$contentsep/) {
129: if ($name) {
130: chomp($value);
131: if ($fname) {
132: $ENV{"form.$name.filename"}=$fname;
133: $ENV{"form.$name.mimetype"}=$fmime;
134: } else {
135: $value=~s/\s+$//s;
136: }
137: $ENV{"form.$name"}=$value;
138: }
139: if ($i<$#lines) {
140: $i++;
141: $lines[$i]=~
142: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
143: $name=$1;
144: $value='';
145: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
146: $fname=$1;
147: if
148: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
149: $fmime=$1;
150: $i++;
151: } else {
152: $fmime='';
153: }
154: } else {
155: $fname='';
156: $fmime='';
157: }
158: $i++;
159: }
160: } else {
161: $value.=$lines[$i]."\n";
162: }
163: }
164: }
165: $r->method_number(M_GET);
166: $r->method('GET');
167: $r->headers_in->unset('Content-length');
168:
169: return OK;
170: } else {
171: $r->log_reason("Cookie $handle not valid", $r->filename)
172: };
173: }
174:
175: # ----------------------------------------------- Store where they wanted to go
176:
177: $ENV{'request.firsturl'}=$requrl;
178: return FORBIDDEN;
179: }
180:
181: 1;
182: __END__
183:
184: =head1 NAME
185:
186: Apache::lonacc - Cookie Based Access Handler for Construction Area
187:
188: =head1 SYNOPSIS
189:
190: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
191:
192: PerlAccessHandler Apache::loncacc
193:
194: =head1 INTRODUCTION
195:
196: This module enables cookie based authentication for construction area
197: and is used to control access for three (essentially equivalent) URIs.
198:
199: <LocationMatch "^/priv.*">
200: <LocationMatch "^/\~.*">
201: <LocationMatch "^/\~.*/$">
202:
203: Whenever the client sends the cookie back to the server,
204: if the cookie is missing or invalid, the user is re-challenged
205: for login information.
206:
207: This is part of the LearningOnline Network with CAPA project
208: described at http://www.lon-capa.org.
209:
210: =head1 HANDLER SUBROUTINE
211:
212: This routine is called by Apache and mod_perl.
213:
214: =over 4
215:
216: =item *
217:
218: load POST parameters
219:
220: =item *
221:
222: store where they wanted to go (first url entered)
223:
224: =back
225:
226: =head1 OTHERSUBROUTINES
227:
228: =over 4
229:
230: =item *
231:
232: constructaccess($url,$ownerdomain) : See if the owner domain and name
233: in the URL match those in the expected environment. If so, return
234: two element list ($ownername,$ownerdomain). Else, return null string.
235:
236: =back
237:
238: =cut
239:
240:
241:
242:
243:
244:
245:
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