1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.27 2002/02/25 21:22:51 www 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: # YEAR=1999
29: # 5/21/99,5/22,5/29,5/31,6/15,16/11,22/11,
30: # YEAR=2000
31: # 01/06,01/13,05/31,06/01,09/06,09/25,09/28,10/30,11/6,
32: # 12/25,12/26,
33: # YEAR=2001
34: # 01/06/01,05/28,8/11,9/26,11/29 Gerd Kortemeyer
35: # 12/15 Scott Harrison
36: # YEAR=2002
37: # 1/4,2/25 Gerd Kortemeyer
38: #
39: ###
40:
41: package Apache::lonacc;
42:
43: use strict;
44: use Apache::Constants qw(:common :http :methods);
45: use Apache::File;
46: use Apache::lonnet;
47: use Apache::loncommon();
48: use CGI::Cookie();
49: use Fcntl qw(:flock);
50:
51: sub handler {
52: my $r = shift;
53: my $requrl=$r->uri;
54: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
55: my $lonid=$cookies{'lonID'};
56: my $cookie;
57: if ($lonid) {
58: my $handle=$lonid->value;
59: $handle=~s/\W//g;
60: my $lonidsdir=$r->dir_config('lonIDsDir');
61: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
62:
63: # ------------------------------------------- Transfer profile into environment
64:
65: my @profile;
66: {
67: my $idf=Apache::File->new("$lonidsdir/$handle.id");
68: flock($idf,LOCK_SH);
69: @profile=<$idf>;
70: $idf->close();
71: }
72: my $envi;
73: for ($envi=0;$envi<=$#profile;$envi++) {
74: chomp($profile[$envi]);
75: my ($envname,$envvalue)=split(/=/,$profile[$envi]);
76: $ENV{$envname} = $envvalue;
77: }
78: $ENV{'user.environment'} = "$lonidsdir/$handle.id";
79: if ($requrl=~/^\/res\//) {
80: $ENV{'request.state'} = "published";
81: } else {
82: $ENV{'request.state'} = 'unknown';
83: }
84: $ENV{'request.filename'} = $r->filename;
85:
86: # -------------------------------------------------------- Load POST parameters
87:
88:
89:
90: my $buffer;
91:
92: $r->read($buffer,$r->header_in('Content-length'));
93:
94: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
95: my @pairs=split(/&/,$buffer);
96: my $pair;
97: foreach $pair (@pairs) {
98: my ($name,$value) = split(/=/,$pair);
99: $value =~ tr/+/ /;
100: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
101: $name =~ tr/+/ /;
102: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
103: if ($ENV{"form.$name"}) {
104: $ENV{"form.$name"}.=','.$value;
105: } else {
106: $ENV{"form.$name"}=$value;
107: }
108: }
109: } else {
110: my $contentsep=$1;
111: my @lines = split (/\n/,$buffer);
112: my $name='';
113: my $value='';
114: my $fname='';
115: my $fmime='';
116: my $i;
117: for ($i=0;$i<=$#lines;$i++) {
118: if ($lines[$i]=~/^$contentsep/) {
119: if ($name) {
120: chomp($value);
121: if ($fname) {
122: $ENV{"form.$name.filename"}=$fname;
123: $ENV{"form.$name.mimetype"}=$fmime;
124: } else {
125: $value=~s/\s+$//s;
126: }
127: $ENV{"form.$name"}=$value;
128: }
129: if ($i<$#lines) {
130: $i++;
131: $lines[$i]=~
132: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
133: $name=$1;
134: $value='';
135: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
136: $fname=$1;
137: if
138: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
139: $fmime=$1;
140: $i++;
141: } else {
142: $fmime='';
143: }
144: } else {
145: $fname='';
146: $fmime='';
147: }
148: $i++;
149: }
150: } else {
151: $value.=$lines[$i]."\n";
152: }
153: }
154: }
155: $ENV{'request.method'}=$ENV{'REQUEST_METHOD'};
156: $r->method_number(M_GET);
157: $r->method('GET');
158: $r->headers_in->unset('Content-length');
159:
160: # ---------------------------------------------------------------- Check access
161:
162: if ($requrl!~/^\/adm\//) {
163: my $access=&Apache::lonnet::allowed('bre',$requrl);
164: if ($access eq '1') {
165: $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
166: return HTTP_NOT_ACCEPTABLE;
167: }
168: if (($access ne '2') && ($access ne 'F')) {
169: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
170: return HTTP_NOT_ACCEPTABLE;
171: }
172: }
173: # ------------------------------------------------------------- This is allowed
174: if ($ENV{'request.course.id'}) {
175: &Apache::lonnet::countacc($requrl);
176: $requrl=~/\.(\w+)$/;
177: if (&Apache::loncommon::fileembstyle($1) eq 'ssi') {
178: # ------------------------------------- This is serious stuff, get symb and log
179: my $symb=&Apache::lonnet::symbread;
180: $ENV{'request.symb'}=$symb;
181: &Apache::lonnet::courseacclog($symb);
182: } else {
183: # ------------------------------------------------------- This is other content
184: &Apache::lonnet::courseacclog($requrl);
185: }
186: }
187: return OK;
188: } else {
189: $r->log_reason("Cookie $handle not valid", $r->filename)
190: };
191: }
192:
193: # -------------------------------------------- See if this is a public resource
194: if (&Apache::lonnet::metadata($requrl,'copyright') eq 'public') {
195: &Apache::lonnet::logthis('Granting public access: '.$requrl);
196: $ENV{'user.name'}='public';
197: $ENV{'user.domain'}='public';
198: $ENV{'request.state'} = "published";
199: $ENV{'request.publicaccess'} = 1;
200: $ENV{'request.filename'} = $r->filename;
201: return OK;
202: }
203: # ----------------------------------------------- Store where they wanted to go
204:
205: $ENV{'request.firsturl'}=$requrl;
206: return FORBIDDEN;
207: }
208:
209: 1;
210: __END__
211:
212: =head1 NAME
213:
214: Apache::lonacc - Cookie Based Access Handler
215:
216: =head1 SYNOPSIS
217:
218: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
219:
220: PerlAccessHandler Apache::lonacc
221:
222: =head1 INTRODUCTION
223:
224: This module enables cookie based authentication and is used
225: to control access for many different LON-CAPA URIs.
226:
227: Whenever the client sends the cookie back to the server,
228: this cookie is handled by either lonacc.pm or loncacc.pm
229: (see srm.conf for what is invoked when). If
230: the cookie is missing or invalid, the user is re-challenged
231: for login information.
232:
233: This is part of the LearningOnline Network with CAPA project
234: described at http://www.lon-capa.org.
235:
236: =head1 HANDLER SUBROUTINE
237:
238: This routine is called by Apache and mod_perl.
239:
240: =over 4
241:
242: =item *
243:
244: transfer profile into environment
245:
246: =item *
247:
248: load POST parameters
249:
250: =item *
251:
252: check access
253:
254: =item *
255:
256: if allowed, get symb, log, generate course statistics if applicable
257:
258: =item *
259:
260: otherwise return error
261:
262: =item *
263:
264: see if public resource
265:
266: =item *
267:
268: store attempted access
269:
270: =back
271:
272: =cut
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