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 1.27 2003/05/06 21:45:25 albertel 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: # YEAR=2002
35: # 1/4 Gerd Kortemeyer
36: ###
37:
38: package Apache::loncacc;
39:
40: use strict;
41: use Apache::Constants qw(:common :http :methods REDIRECT);
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: # We do not allow editing of previous versions of files.
51: if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
52: if (($ownername eq $ENV{'user.name'}) &&
53: ($ownerdomain eq $ENV{'user.domain'})) {
54: return ($ownername,$ownerdomain);
55: }
56:
57: my $capriv='user.priv.ca./'.
58: $ownerdomain.'/'.$ownername.'./'.
59: $ownerdomain.'/'.$ownername;
60: foreach (keys %ENV) {
61: if ($_ eq $capriv) {
62: return ($ownername,$ownerdomain);
63: }
64: }
65:
66: return '';
67: }
68:
69: sub handler {
70: my $r = shift;
71: my $requrl=$r->uri;
72: $ENV{'request.editurl'}=$requrl;
73: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
74: my $lonid=$cookies{'lonID'};
75: my $cookie;
76: if ($lonid) {
77: my $handle=$lonid->value;
78: $handle=~s/\W//g;
79: my $lonidsdir=$r->dir_config('lonIDsDir');
80: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
81: my @profile;
82: {
83: my $idf=Apache::File->new("$lonidsdir/$handle.id");
84: flock($idf,LOCK_SH);
85: @profile=<$idf>;
86: $idf->close();
87: }
88: my $envi;
89: for ($envi=0;$envi<=$#profile;$envi++) {
90: chomp($profile[$envi]);
91: my ($envname,$envvalue)=split(/=/,$profile[$envi]);
92: $ENV{$envname} = $envvalue;
93: }
94: $ENV{'user.environment'} = "$lonidsdir/$handle.id";
95: $ENV{'request.state'} = "construct";
96: $ENV{'request.filename'} = $r->filename;
97:
98: unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {
99: $r->log_reason("Unauthorized $requrl", $r->filename);
100: return HTTP_NOT_ACCEPTABLE;
101: }
102: # Construction space needs Remote to work
103: if ($ENV{'environment.remote'} eq 'off') {
104: $r->content_type('text/html');
105: $r->header_out(Location =>
106: 'http://'.$r->server->server_hostname.
107: '/adm/remote?action=launch&url='.
108: &Apache::lonnet::escape($requrl));
109: return REDIRECT;
110: }
111:
112: # -------------------------------------------------------- Load POST parameters
113:
114:
115: my $buffer;
116:
117: $r->read($buffer,$r->header_in('Content-length'),0);
118:
119: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
120: my @pairs=split(/&/,$buffer);
121: my $pair;
122: foreach $pair (@pairs) {
123: my ($name,$value) = split(/=/,$pair);
124: $value =~ tr/+/ /;
125: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
126: $name =~ tr/+/ /;
127: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
128: &Apache::loncommon::add_to_env("form.$name",$value);
129: }
130: } else {
131: my $contentsep=$1;
132: my @lines = split (/\n/,$buffer);
133: my $name='';
134: my $value='';
135: my $fname='';
136: my $fmime='';
137: my $i;
138: for ($i=0;$i<=$#lines;$i++) {
139: if ($lines[$i]=~/^$contentsep/) {
140: if ($name) {
141: chomp($value);
142: if ($fname) {
143: $ENV{"form.$name.filename"}=$fname;
144: $ENV{"form.$name.mimetype"}=$fmime;
145: } else {
146: $value=~s/\s+$//s;
147: }
148: &Apache::loncommon::add_to_env("form.$name",$value);
149: }
150: if ($i<$#lines) {
151: $i++;
152: $lines[$i]=~
153: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
154: $name=$1;
155: $value='';
156: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
157: $fname=$1;
158: if
159: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
160: $fmime=$1;
161: $i++;
162: } else {
163: $fmime='';
164: }
165: } else {
166: $fname='';
167: $fmime='';
168: }
169: $i++;
170: }
171: } else {
172: $value.=$lines[$i]."\n";
173: }
174: }
175: }
176: $ENV{'request.method'}=$ENV{'REQUEST_METHOD'};
177: $r->method_number(M_GET);
178: $r->method('GET');
179: $r->headers_in->unset('Content-length');
180:
181: return OK;
182: } else {
183: $r->log_reason("Cookie $handle not valid", $r->filename)
184: };
185: }
186:
187: # ----------------------------------------------- Store where they wanted to go
188:
189: $ENV{'request.firsturl'}=$requrl;
190: return FORBIDDEN;
191: }
192:
193: 1;
194: __END__
195:
196: =head1 NAME
197:
198: Apache::lonacc - Cookie Based Access Handler for Construction Area
199:
200: =head1 SYNOPSIS
201:
202: Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf:
203:
204: PerlAccessHandler Apache::loncacc
205:
206: =head1 INTRODUCTION
207:
208: This module enables cookie based authentication for construction area
209: and is used to control access for three (essentially equivalent) URIs.
210:
211: <LocationMatch "^/priv.*">
212: <LocationMatch "^/\~.*">
213: <LocationMatch "^/\~.*/$">
214:
215: Whenever the client sends the cookie back to the server,
216: if the cookie is missing or invalid, the user is re-challenged
217: for login information.
218:
219: This is part of the LearningOnline Network with CAPA project
220: described at http://www.lon-capa.org.
221:
222: =head1 HANDLER SUBROUTINE
223:
224: This routine is called by Apache and mod_perl.
225:
226: =over 4
227:
228: =item *
229:
230: load POST parameters
231:
232: =item *
233:
234: store where they wanted to go (first url entered)
235:
236: =back
237:
238: =head1 OTHERSUBROUTINES
239:
240: =over 4
241:
242: =item *
243:
244: constructaccess($url,$ownerdomain) : See if the owner domain and name
245: in the URL match those in the expected environment. If so, return
246: two element list ($ownername,$ownerdomain). Else, return null string.
247:
248: =back
249:
250: =cut
251:
252:
253:
254:
255:
256:
257:
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