1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.62 2005/02/08 01:20:11 albertel 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 Apache::lonlocal;
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") && ($handle ne '')) {
62:
63: # ------------------------------------------------------ Initialize Environment
64:
65: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
66:
67: # --------------------------------------------------------- Initialize Language
68:
69: &Apache::lonlocal::get_language_handle($r);
70:
71: # -------------------------------------------------------------- Resource State
72:
73: if ($requrl=~/^\/+(res|uploaded)\//) {
74: $ENV{'request.state'} = "published";
75: } else {
76: $ENV{'request.state'} = 'unknown';
77: }
78: $ENV{'request.filename'} = $r->filename;
79: $ENV{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
80: # -------------------------------------------------------- Load POST parameters
81:
82: &Apache::loncommon::get_posted_cgi($r);
83:
84: # ---------------------------------------------------------------- Check access
85:
86: if ($requrl!~/^\/adm|public|prtspool\//) {
87: my $access=&Apache::lonnet::allowed('bre',$requrl);
88: if ($access eq '1') {
89: $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
90: return HTTP_NOT_ACCEPTABLE;
91: }
92: if (($access ne '2') && ($access ne 'F')) {
93: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
94: return HTTP_NOT_ACCEPTABLE;
95: }
96: }
97: if ($requrl =~ m|^/prtspool/|) {
98: my $start='/prtspool/'.$ENV{'user.name'}.'_'.
99: $ENV{'user.domain'};
100: if ($requrl !~ /^\Q$start\E/) {
101: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
102: return HTTP_NOT_ACCEPTABLE;
103: }
104: }
105: # ------------------------------------------------------------- This is allowed
106: if ($ENV{'request.course.id'}) {
107: &Apache::lonnet::countacc($requrl);
108: $requrl=~/\.(\w+)$/;
109: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
110: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$)/) ||
111: ($requrl=~/^\/adm\/wrapper\//) ||
112: ($requrl=~m|\.problem/smpedit$|) ||
113: ($requrl=~/^\/public\/.*\/syllabus$/)) {
114: # ------------------------------------- This is serious stuff, get symb and log
115: my $query=$r->args;
116: my $symb;
117: if ($query) {
118: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
119: }
120: if ($ENV{'form.symb'}) {
121: $symb=&Apache::lonnet::symbclean($ENV{'form.symb'});
122: if ($requrl =~ m|^/adm/wrapper/|) {
123: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
124: &Apache::lonnet::symblist($map,$murl => $mid,
125: 'last_known' => $murl);
126: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
127: (($requrl=~m|(.*)/smpedit$|) &&
128: &Apache::lonnet::symbverify($symb,$1))) {
129: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
130: &Apache::lonnet::symblist($map,$murl => $mid,
131: 'last_known' => $murl);
132: } else {
133: $r->log_reason('Invalid symb for '.$requrl.': '.
134: $symb);
135: $ENV{'user.error.msg'}=
136: "$requrl:bre:1:1:Invalid Access";
137: return HTTP_NOT_ACCEPTABLE;
138: }
139: } else {
140: $symb=&Apache::lonnet::symbread($requrl);
141: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
142: !&Apache::lonnet::symbverify($symb,$requrl)) {
143: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
144: $ENV{'user.error.msg'}=
145: "$requrl:bre:1:1:Invalid Access";
146: return HTTP_NOT_ACCEPTABLE;
147: }
148: if ($symb) {
149: my ($map,$mid,$murl)=split(/\_\_\_/,$symb);
150: &Apache::lonnet::symblist($map,$murl => $mid,
151: 'last_known' => $murl);
152: }
153: }
154: $ENV{'request.symb'}=$symb;
155: &Apache::lonnet::courseacclog($symb);
156: } else {
157: # ------------------------------------------------------- This is other content
158: &Apache::lonnet::courseacclog($requrl);
159: }
160: }
161: return OK;
162: } else {
163: $r->log_reason("Cookie $handle not valid", $r->filename)
164: };
165: }
166:
167: # -------------------------------------------- See if this is a public resource
168: if ($requrl=~m|^/public/|
169: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
170: &Apache::lonnet::logthis('Granting public access: '.$requrl);
171: &Apache::loncommon::get_posted_cgi($r);
172: $ENV{'user.name'}='public';
173: $ENV{'user.domain'}='public';
174: $ENV{'request.state'} = "published";
175: $ENV{'request.publicaccess'} = 1;
176: $ENV{'request.filename'} = $r->filename;
177: my ($httpbrowser, $clientbrowser, $clientversion,
178: $clientmathml, $clientunicode, $clientos) =
179: &Apache::loncommon::decode_user_agent($r);
180: $ENV{'browser.type'}=$clientbrowser;
181: $ENV{'browser.version'}=$clientversion;
182: $ENV{'browser.mathml'}=$clientmathml;
183: $ENV{'browser.unicode'}=$clientunicode;
184: $ENV{'browser.os'}=$clientos;
185:
186: return OK;
187: }
188: # -------------------------------------------------------------- Not authorized
189: $requrl=~/\.(\w+)$/;
190: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
191: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
192: # ($requrl=~m|^/prtspool/|)) {
193: # -------------------------- Store where they wanted to go and get login screen
194: $ENV{'request.querystring'}=$r->args;
195: $ENV{'request.firsturl'}=$requrl;
196: return FORBIDDEN;
197: # } else {
198: # --------------------------------------------------------------------- Goodbye
199: # return HTTP_BAD_REQUEST;
200: # }
201: }
202:
203: 1;
204: __END__
205:
206: =head1 NAME
207:
208: Apache::lonacc - Cookie Based Access Handler
209:
210: =head1 SYNOPSIS
211:
212: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
213:
214: PerlAccessHandler Apache::lonacc
215:
216: =head1 INTRODUCTION
217:
218: This module enables cookie based authentication and is used
219: to control access for many different LON-CAPA URIs.
220:
221: Whenever the client sends the cookie back to the server,
222: this cookie is handled by either lonacc.pm or loncacc.pm
223: (see srm.conf for what is invoked when). If
224: the cookie is missing or invalid, the user is re-challenged
225: for login information.
226:
227: This is part of the LearningOnline Network with CAPA project
228: described at http://www.lon-capa.org.
229:
230: =head1 HANDLER SUBROUTINE
231:
232: This routine is called by Apache and mod_perl.
233:
234: =over 4
235:
236: =item *
237:
238: transfer profile into environment
239:
240: =item *
241:
242: load POST parameters
243:
244: =item *
245:
246: check access
247:
248: =item *
249:
250: if allowed, get symb, log, generate course statistics if applicable
251:
252: =item *
253:
254: otherwise return error
255:
256: =item *
257:
258: see if public resource
259:
260: =item *
261:
262: store attempted access
263:
264: =back
265:
266: =cut
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