1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.25 2001/12/15 20:40:23 harris41 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: #
37: ###
38:
39: package Apache::lonacc;
40:
41: use strict;
42: use Apache::Constants qw(:common :http :methods);
43: use Apache::File;
44: use Apache::lonnet;
45: use Apache::loncommon();
46: use CGI::Cookie();
47: use Fcntl qw(:flock);
48:
49: sub handler {
50: my $r = shift;
51: my $requrl=$r->uri;
52: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
53: my $lonid=$cookies{'lonID'};
54: my $cookie;
55: if ($lonid) {
56: my $handle=$lonid->value;
57: $handle=~s/\W//g;
58: my $lonidsdir=$r->dir_config('lonIDsDir');
59: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
60:
61: # ------------------------------------------- Transfer profile into environment
62:
63: my @profile;
64: {
65: my $idf=Apache::File->new("$lonidsdir/$handle.id");
66: flock($idf,LOCK_SH);
67: @profile=<$idf>;
68: $idf->close();
69: }
70: my $envi;
71: for ($envi=0;$envi<=$#profile;$envi++) {
72: chomp($profile[$envi]);
73: my ($envname,$envvalue)=split(/=/,$profile[$envi]);
74: $ENV{$envname} = $envvalue;
75: }
76: $ENV{'user.environment'} = "$lonidsdir/$handle.id";
77: if ($requrl=~/^\/res\//) {
78: $ENV{'request.state'} = "published";
79: } else {
80: $ENV{'request.state'} = 'unknown';
81: }
82: $ENV{'request.filename'} = $r->filename;
83:
84: # -------------------------------------------------------- Load POST parameters
85:
86:
87:
88: my $buffer;
89:
90: $r->read($buffer,$r->header_in('Content-length'));
91:
92: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
93: my @pairs=split(/&/,$buffer);
94: my $pair;
95: foreach $pair (@pairs) {
96: my ($name,$value) = split(/=/,$pair);
97: $value =~ tr/+/ /;
98: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
99: $name =~ tr/+/ /;
100: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
101: $ENV{"form.$name"}=$value;
102: }
103: } else {
104: my $contentsep=$1;
105: my @lines = split (/\n/,$buffer);
106: my $name='';
107: my $value='';
108: my $fname='';
109: my $fmime='';
110: my $i;
111: for ($i=0;$i<=$#lines;$i++) {
112: if ($lines[$i]=~/^$contentsep/) {
113: if ($name) {
114: chomp($value);
115: if ($fname) {
116: $ENV{"form.$name.filename"}=$fname;
117: $ENV{"form.$name.mimetype"}=$fmime;
118: } else {
119: $value=~s/\s+$//s;
120: }
121: $ENV{"form.$name"}=$value;
122: }
123: if ($i<$#lines) {
124: $i++;
125: $lines[$i]=~
126: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
127: $name=$1;
128: $value='';
129: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
130: $fname=$1;
131: if
132: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
133: $fmime=$1;
134: $i++;
135: } else {
136: $fmime='';
137: }
138: } else {
139: $fname='';
140: $fmime='';
141: }
142: $i++;
143: }
144: } else {
145: $value.=$lines[$i]."\n";
146: }
147: }
148: }
149: $r->method_number(M_GET);
150: $r->method('GET');
151: $r->headers_in->unset('Content-length');
152:
153: # ---------------------------------------------------------------- Check access
154:
155: if ($requrl!~/^\/adm\//) {
156: my $access=&Apache::lonnet::allowed('bre',$requrl);
157: if ($access eq '1') {
158: $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
159: return HTTP_NOT_ACCEPTABLE;
160: }
161: if (($access ne '2') && ($access ne 'F')) {
162: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
163: return HTTP_NOT_ACCEPTABLE;
164: }
165: }
166: # ------------------------------------------------------------- This is allowed
167: if ($ENV{'request.course.id'}) {
168: &Apache::lonnet::countacc($requrl);
169: $requrl=~/\.(\w+)$/;
170: if (&Apache::loncommon::fileembstyle($1) eq 'ssi') {
171: # ------------------------------------- This is serious stuff, get symb and log
172: my $symb=&Apache::lonnet::symbread;
173: $ENV{'request.symb'}=$symb;
174: &Apache::lonnet::courseacclog($symb);
175: } else {
176: # ------------------------------------------------------- This is other content
177: &Apache::lonnet::courseacclog($requrl);
178: }
179: }
180: return OK;
181: } else {
182: $r->log_reason("Cookie $handle not valid", $r->filename)
183: };
184: }
185:
186: # -------------------------------------------- See if this is a public resource
187: if (&Apache::lonnet::metadata($requrl,'copyright') eq 'public') {
188: &Apache::lonnet::logthis('Granting public access: '.$requrl);
189: $ENV{'user.name'}='public';
190: $ENV{'user.domain'}='public';
191: $ENV{'request.state'} = "published";
192: $ENV{'request.publicaccess'} = 1;
193: $ENV{'request.filename'} = $r->filename;
194: return OK;
195: }
196: # ----------------------------------------------- Store where they wanted to go
197:
198: $ENV{'request.firsturl'}=$requrl;
199: return FORBIDDEN;
200: }
201:
202: 1;
203: __END__
204:
205: =head1 NAME
206:
207: Apache::lonacc - Cookie Based Access Handler
208:
209: =head1 SYNOPSIS
210:
211: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
212:
213: PerlAccessHandler Apache::lonacc
214:
215: =head1 INTRODUCTION
216:
217: This module enables cookie based authentication and is used
218: to control access for many different LON-CAPA URIs.
219:
220: Whenever the client sends the cookie back to the server,
221: this cookie is handled by either lonacc.pm or loncacc.pm
222: (see srm.conf for what is invoked when). If
223: the cookie is missing or invalid, the user is re-challenged
224: for login information.
225:
226: This is part of the LearningOnline Network with CAPA project
227: described at http://www.lon-capa.org.
228:
229: =head1 HANDLER SUBROUTINE
230:
231: This routine is called by Apache and mod_perl.
232:
233: =over 4
234:
235: =item *
236:
237: transfer profile into environment
238:
239: =item *
240:
241: load POST parameters
242:
243: =item *
244:
245: check access
246:
247: =item *
248:
249: if allowed, get symb, log, generate course statistics if applicable
250:
251: =item *
252:
253: otherwise return error
254:
255: =item *
256:
257: see if public resource
258:
259: =item *
260:
261: store attempted access
262:
263: =back
264:
265: =cut
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