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 1.24 2002/12/10 20:37:21 matthew 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: # YEAR=2002
36: # 1/4 Gerd Kortemeyer
37: ###
38:
39: package Apache::loncacc;
40:
41: use strict;
42: use Apache::Constants qw(:common :http :methods);
43: use Apache::File;
44: use CGI::Cookie();
45: use Fcntl qw(:flock);
46:
47: sub constructaccess {
48: my ($url,$ownerdomain)=@_;
49: my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)(\w+)/);
50: unless (($ownername) && ($ownerdomain)) { return ''; }
51: # We do not allow editing of previous versions of files.
52: if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
53: if (($ownername eq $ENV{'user.name'}) &&
54: ($ownerdomain eq $ENV{'user.domain'})) {
55: return ($ownername,$ownerdomain);
56: }
57:
58: my $capriv='user.priv.ca./'.
59: $ownerdomain.'/'.$ownername.'./'.
60: $ownerdomain.'/'.$ownername;
61: foreach (keys %ENV) {
62: if ($_ eq $capriv) {
63: return ($ownername,$ownerdomain);
64: }
65: }
66:
67: return '';
68: }
69:
70: sub handler {
71: my $r = shift;
72: my $requrl=$r->uri;
73: $ENV{'request.editurl'}=$requrl;
74: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
75: my $lonid=$cookies{'lonID'};
76: my $cookie;
77: if ($lonid) {
78: my $handle=$lonid->value;
79: $handle=~s/\W//g;
80: my $lonidsdir=$r->dir_config('lonIDsDir');
81: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
82: my @profile;
83: {
84: my $idf=Apache::File->new("$lonidsdir/$handle.id");
85: flock($idf,LOCK_SH);
86: @profile=<$idf>;
87: $idf->close();
88: }
89: my $envi;
90: for ($envi=0;$envi<=$#profile;$envi++) {
91: chomp($profile[$envi]);
92: my ($envname,$envvalue)=split(/=/,$profile[$envi]);
93: $ENV{$envname} = $envvalue;
94: }
95: $ENV{'user.environment'} = "$lonidsdir/$handle.id";
96: $ENV{'request.state'} = "construct";
97: $ENV{'request.filename'} = $r->filename;
98:
99: unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {
100: $r->log_reason("Unauthorized $requrl", $r->filename);
101: return HTTP_NOT_ACCEPTABLE;
102: }
103:
104: # -------------------------------------------------------- Load POST parameters
105:
106:
107: my $buffer;
108:
109: $r->read($buffer,$r->header_in('Content-length'));
110:
111: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
112: my @pairs=split(/&/,$buffer);
113: my $pair;
114: foreach $pair (@pairs) {
115: my ($name,$value) = split(/=/,$pair);
116: $value =~ tr/+/ /;
117: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
118: $name =~ tr/+/ /;
119: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
120: &Apache::loncommon::add_to_env("form.$name",$value);
121: }
122: } else {
123: my $contentsep=$1;
124: my @lines = split (/\n/,$buffer);
125: my $name='';
126: my $value='';
127: my $fname='';
128: my $fmime='';
129: my $i;
130: for ($i=0;$i<=$#lines;$i++) {
131: if ($lines[$i]=~/^$contentsep/) {
132: if ($name) {
133: chomp($value);
134: if ($fname) {
135: $ENV{"form.$name.filename"}=$fname;
136: $ENV{"form.$name.mimetype"}=$fmime;
137: } else {
138: $value=~s/\s+$//s;
139: }
140: &Apache::loncommon::add_to_env("form.$name",$value);
141: }
142: if ($i<$#lines) {
143: $i++;
144: $lines[$i]=~
145: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
146: $name=$1;
147: $value='';
148: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
149: $fname=$1;
150: if
151: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
152: $fmime=$1;
153: $i++;
154: } else {
155: $fmime='';
156: }
157: } else {
158: $fname='';
159: $fmime='';
160: }
161: $i++;
162: }
163: } else {
164: $value.=$lines[$i]."\n";
165: }
166: }
167: }
168: $ENV{'request.method'}=$ENV{'REQUEST_METHOD'};
169: $r->method_number(M_GET);
170: $r->method('GET');
171: $r->headers_in->unset('Content-length');
172:
173: return OK;
174: } else {
175: $r->log_reason("Cookie $handle not valid", $r->filename)
176: };
177: }
178:
179: # ----------------------------------------------- Store where they wanted to go
180:
181: $ENV{'request.firsturl'}=$requrl;
182: return FORBIDDEN;
183: }
184:
185: 1;
186: __END__
187:
188: =head1 NAME
189:
190: Apache::lonacc - Cookie Based Access Handler for Construction Area
191:
192: =head1 SYNOPSIS
193:
194: Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf:
195:
196: PerlAccessHandler Apache::loncacc
197:
198: =head1 INTRODUCTION
199:
200: This module enables cookie based authentication for construction area
201: and is used to control access for three (essentially equivalent) URIs.
202:
203: <LocationMatch "^/priv.*">
204: <LocationMatch "^/\~.*">
205: <LocationMatch "^/\~.*/$">
206:
207: Whenever the client sends the cookie back to the server,
208: if the cookie is missing or invalid, the user is re-challenged
209: for login information.
210:
211: This is part of the LearningOnline Network with CAPA project
212: described at http://www.lon-capa.org.
213:
214: =head1 HANDLER SUBROUTINE
215:
216: This routine is called by Apache and mod_perl.
217:
218: =over 4
219:
220: =item *
221:
222: load POST parameters
223:
224: =item *
225:
226: store where they wanted to go (first url entered)
227:
228: =back
229:
230: =head1 OTHERSUBROUTINES
231:
232: =over 4
233:
234: =item *
235:
236: constructaccess($url,$ownerdomain) : See if the owner domain and name
237: in the URL match those in the expected environment. If so, return
238: two element list ($ownername,$ownerdomain). Else, return null string.
239:
240: =back
241:
242: =cut
243:
244:
245:
246:
247:
248:
249:
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