1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.1 2003/08/06 20:58:46 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: # YEAR=2002
36: # 1/4,2/25 Gerd Kortemeyer
37: #
38: ###
39:
40: package Apache::lonacc;
41:
42: use strict;
43: use Apache::Constants qw(:common :http :methods);
44: use Apache::File;
45: use Apache::lonnet;
46: use Apache::loncommon();
47: use CGI::Cookie();
48: use Fcntl qw(:flock);
49:
50: sub handler {
51: my $r = shift;
52: my $requrl=$r->uri;
53: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
54: if ($r->header_in('User-Agent')=~/NSDL\_Search\_Bot/) {
55: return OK;
56: }
57: my $lonid=$cookies{'lonID'};
58: my $cookie;
59: if ($lonid) {
60: my $handle=$lonid->value;
61: $handle=~s/\W//g;
62: my $lonidsdir=$r->dir_config('lonIDsDir');
63: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
64:
65: # ------------------------------------------------------ Initialize Environment
66:
67: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
68:
69: # -------------------------------------------------------------- Resource State
70:
71: if ($requrl=~/^\/res\//) {
72: $ENV{'request.state'} = "published";
73: } else {
74: $ENV{'request.state'} = 'unknown';
75: }
76: $ENV{'request.filename'} = $r->filename;
77:
78: # -------------------------------------------------------- Load POST parameters
79:
80: &Apache::loncommon::get_posted_cgi($r);
81:
82: # ---------------------------------------------------------------- Check access
83:
84: if ($requrl!~/^\/adm|public|prtspool\//) {
85: my $access=&Apache::lonnet::allowed('bre',$requrl);
86: if ($access eq '1') {
87: $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
88: return HTTP_NOT_ACCEPTABLE;
89: }
90: if (($access ne '2') && ($access ne 'F')) {
91: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
92: return HTTP_NOT_ACCEPTABLE;
93: }
94: }
95: if ($requrl =~ m|^/prtspool/|) {
96: my $start='/prtspool/'.$ENV{'user.name'}.'_'.
97: $ENV{'user.domain'};
98: if ($requrl !~ /^\Q$start\E/) {
99: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
100: return HTTP_NOT_ACCEPTABLE;
101: }
102: }
103: # ------------------------------------------------------------- This is allowed
104: if ($ENV{'request.course.id'}) {
105: &Apache::lonnet::countacc($requrl);
106: $requrl=~/\.(\w+)$/;
107: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
108: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$)/) ||
109: ($requrl=~/^\/adm\/wrapper\//) ||
110: ($requrl=~/^\/public\/.*\/syllabus$/)) {
111: # ------------------------------------- This is serious stuff, get symb and log
112: my $query=$r->args;
113: my $symb;
114: if ($query) {
115: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
116: }
117: if ($ENV{'form.symb'}) {
118: $symb=&Apache::lonnet::symbclean($ENV{'form.symb'});
119: if (&Apache::lonnet::symbverify($symb,$requrl)) {
120: my ($map,$mid,$murl)=split(/\_\_\_/,$symb);
121: &Apache::lonnet::symblist($map,$murl => $mid,
122: 'last_known' => $murl);
123: } else {
124: $r->log_reason('Invalid symb for '.$requrl.': '.
125: $symb);
126: $ENV{'user.error.msg'}=
127: "$requrl:bre:1:1:Invalid Access";
128: return HTTP_NOT_ACCEPTABLE;
129: }
130: } else {
131: $symb=&Apache::lonnet::symbread($requrl);
132: my ($map,$mid,$murl)=split(/\_\_\_/,$symb);
133: &Apache::lonnet::symblist($map,$murl => $mid,
134: 'last_known' => $murl);
135: }
136: $ENV{'request.symb'}=$symb;
137: &Apache::lonnet::courseacclog($symb);
138: } else {
139: # ------------------------------------------------------- This is other content
140: &Apache::lonnet::courseacclog($requrl);
141: }
142: }
143: return OK;
144: } else {
145: $r->log_reason("Cookie $handle not valid", $r->filename)
146: };
147: }
148:
149: # -------------------------------------------- See if this is a public resource
150: if ($requrl=~m|^/public/|
151: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
152: &Apache::lonnet::logthis('Granting public access: '.$requrl);
153: my $buffer;
154: $r->read($buffer,$r->header_in('Content-length'),0);
155: &Apache::loncommon::get_unprocessed_cgi($buffer);
156: $ENV{'user.name'}='public';
157: $ENV{'user.domain'}='public';
158: $ENV{'request.state'} = "published";
159: $ENV{'request.publicaccess'} = 1;
160: $ENV{'request.filename'} = $r->filename;
161: return OK;
162: }
163: # -------------------------------------------------------------- Not authorized
164: $requrl=~/\.(\w+)$/;
165: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
166: ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
167: ($requrl=~m|^/prtspool/|)) {
168: # -------------------------- Store where they wanted to go and get login screen
169: $ENV{'request.querystring'}=$r->args;
170: $ENV{'request.firsturl'}=$requrl;
171: return FORBIDDEN;
172: } else {
173: # --------------------------------------------------------------------- Goodbye
174: return HTTP_BAD_REQUEST;
175: }
176: }
177:
178: 1;
179: __END__
180:
181: =head1 NAME
182:
183: Apache::lonacc - Cookie Based Access Handler
184:
185: =head1 SYNOPSIS
186:
187: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
188:
189: PerlAccessHandler Apache::lonacc
190:
191: =head1 INTRODUCTION
192:
193: This module enables cookie based authentication and is used
194: to control access for many different LON-CAPA URIs.
195:
196: Whenever the client sends the cookie back to the server,
197: this cookie is handled by either lonacc.pm or loncacc.pm
198: (see srm.conf for what is invoked when). If
199: the cookie is missing or invalid, the user is re-challenged
200: for login information.
201:
202: This is part of the LearningOnline Network with CAPA project
203: described at http://www.lon-capa.org.
204:
205: =head1 HANDLER SUBROUTINE
206:
207: This routine is called by Apache and mod_perl.
208:
209: =over 4
210:
211: =item *
212:
213: transfer profile into environment
214:
215: =item *
216:
217: load POST parameters
218:
219: =item *
220:
221: check access
222:
223: =item *
224:
225: if allowed, get symb, log, generate course statistics if applicable
226:
227: =item *
228:
229: otherwise return error
230:
231: =item *
232:
233: see if public resource
234:
235: =item *
236:
237: store attempted access
238:
239: =back
240:
241: =cut
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