1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.33 2002/06/15 19:45:26 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($1))/eg;
103: &Apache::loncommon::add_to_env("form.$name",$value);
104: }
105: } else {
106: my $contentsep=$1;
107: my @lines = split (/\n/,$buffer);
108: my $name='';
109: my $value='';
110: my $fname='';
111: my $fmime='';
112: my $i;
113: for ($i=0;$i<=$#lines;$i++) {
114: if ($lines[$i]=~/^$contentsep/) {
115: if ($name) {
116: chomp($value);
117: if ($fname) {
118: $ENV{"form.$name.filename"}=$fname;
119: $ENV{"form.$name.mimetype"}=$fmime;
120: } else {
121: $value=~s/\s+$//s;
122: }
123: &Apache::loncommon::add_to_env("form.$name",$value);
124: }
125: if ($i<$#lines) {
126: $i++;
127: $lines[$i]=~
128: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
129: $name=$1;
130: $value='';
131: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
132: $fname=$1;
133: if
134: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
135: $fmime=$1;
136: $i++;
137: } else {
138: $fmime='';
139: }
140: } else {
141: $fname='';
142: $fmime='';
143: }
144: $i++;
145: }
146: } else {
147: $value.=$lines[$i]."\n";
148: }
149: }
150: }
151: $ENV{'request.method'}=$ENV{'REQUEST_METHOD'};
152: $r->method_number(M_GET);
153: $r->method('GET');
154: $r->headers_in->unset('Content-length');
155:
156: # ---------------------------------------------------------------- Check access
157:
158: if ($requrl!~/^\/adm\//) {
159: my $access=&Apache::lonnet::allowed('bre',$requrl);
160: if ($access eq '1') {
161: $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
162: return HTTP_NOT_ACCEPTABLE;
163: }
164: if (($access ne '2') && ($access ne 'F')) {
165: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
166: return HTTP_NOT_ACCEPTABLE;
167: }
168: }
169: # ------------------------------------------------------------- This is allowed
170: if ($ENV{'request.course.id'}) {
171: &Apache::lonnet::countacc($requrl);
172: $requrl=~/\.(\w+)$/;
173: if (&Apache::loncommon::fileembstyle($1) eq 'ssi') {
174: # ------------------------------------- This is serious stuff, get symb and log
175: my $query=$r->args;
176: my $symb;
177: if ($query) {
178: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
179: }
180: if ($ENV{'form.symb'}) {
181: $symb=&Apache::lonnet::symbclean($ENV{'form.symb'});
182: if (&Apache::lonnet::symbverify($symb,$requrl)) {
183: my ($map,$mid,$murl)=split(/\_\_\_/,$symb);
184: &Apache::lonnet::symblist($map,$murl => $mid,
185: 'last_known' => $murl);
186: } else {
187: $r->log_reason('Invalid symb for '.$requrl.': '.
188: $symb);
189: $ENV{'user.error.msg'}=
190: "$requrl:bre:1:1:Invalid Access";
191: return HTTP_NOT_ACCEPTABLE;
192: }
193: } else {
194: $symb=&Apache::lonnet::symbread;
195: }
196: $ENV{'request.symb'}=$symb;
197: &Apache::lonnet::courseacclog($symb);
198: } else {
199: # ------------------------------------------------------- This is other content
200: &Apache::lonnet::courseacclog($requrl);
201: }
202: }
203: return OK;
204: } else {
205: $r->log_reason("Cookie $handle not valid", $r->filename)
206: };
207: }
208:
209: # -------------------------------------------- See if this is a public resource
210: if (&Apache::lonnet::metadata($requrl,'copyright') eq 'public') {
211: &Apache::lonnet::logthis('Granting public access: '.$requrl);
212: $ENV{'user.name'}='public';
213: $ENV{'user.domain'}='public';
214: $ENV{'request.state'} = "published";
215: $ENV{'request.publicaccess'} = 1;
216: $ENV{'request.filename'} = $r->filename;
217: return OK;
218: }
219: # ----------------------------------------------- Store where they wanted to go
220:
221: $ENV{'request.firsturl'}=$requrl;
222: return FORBIDDEN;
223: }
224:
225: 1;
226: __END__
227:
228: =head1 NAME
229:
230: Apache::lonacc - Cookie Based Access Handler
231:
232: =head1 SYNOPSIS
233:
234: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
235:
236: PerlAccessHandler Apache::lonacc
237:
238: =head1 INTRODUCTION
239:
240: This module enables cookie based authentication and is used
241: to control access for many different LON-CAPA URIs.
242:
243: Whenever the client sends the cookie back to the server,
244: this cookie is handled by either lonacc.pm or loncacc.pm
245: (see srm.conf for what is invoked when). If
246: the cookie is missing or invalid, the user is re-challenged
247: for login information.
248:
249: This is part of the LearningOnline Network with CAPA project
250: described at http://www.lon-capa.org.
251:
252: =head1 HANDLER SUBROUTINE
253:
254: This routine is called by Apache and mod_perl.
255:
256: =over 4
257:
258: =item *
259:
260: transfer profile into environment
261:
262: =item *
263:
264: load POST parameters
265:
266: =item *
267:
268: check access
269:
270: =item *
271:
272: if allowed, get symb, log, generate course statistics if applicable
273:
274: =item *
275:
276: otherwise return error
277:
278: =item *
279:
280: see if public resource
281:
282: =item *
283:
284: store attempted access
285:
286: =back
287:
288: =cut
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