1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.60.2.1 2005/02/21 18:22:04 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($r->header_in('Cookie'));
55: if ($r->header_in('User-Agent')=~/NSDL\_Search\_Bot/) {
56: return OK;
57: }
58: my $lonid=$cookies{'lonID'};
59: my $cookie;
60: if ($lonid) {
61: my $handle=$lonid->value;
62: $handle=~s/\W//g;
63: my $lonidsdir=$r->dir_config('lonIDsDir');
64: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
65:
66: # ------------------------------------------------------ Initialize Environment
67:
68: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
69:
70: # --------------------------------------------------------- Initialize Language
71:
72: &Apache::lonlocal::get_language_handle($r);
73:
74: # -------------------------------------------------------------- Resource State
75:
76: if ($requrl=~/^\/+(res|uploaded)\//) {
77: $ENV{'request.state'} = "published";
78: } else {
79: $ENV{'request.state'} = 'unknown';
80: }
81: $ENV{'request.filename'} = $r->filename;
82: $ENV{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
83: # -------------------------------------------------------- Load POST parameters
84:
85: &Apache::loncommon::get_posted_cgi($r);
86:
87: # ---------------------------------------------------------------- Check access
88:
89: if ($requrl!~/^\/adm|public|prtspool\//) {
90: my $access=&Apache::lonnet::allowed('bre',$requrl);
91: if ($access eq '1') {
92: $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
93: return HTTP_NOT_ACCEPTABLE;
94: }
95: if (($access ne '2') && ($access ne 'F')) {
96: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
97: return HTTP_NOT_ACCEPTABLE;
98: }
99: }
100: if ($requrl =~ m|^/prtspool/|) {
101: my $start='/prtspool/'.$ENV{'user.name'}.'_'.
102: $ENV{'user.domain'};
103: if ($requrl !~ /^\Q$start\E/) {
104: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
105: return HTTP_NOT_ACCEPTABLE;
106: }
107: }
108: # ------------------------------------------------------------- This is allowed
109: if ($ENV{'request.course.id'}) {
110: &Apache::lonnet::countacc($requrl);
111: $requrl=~/\.(\w+)$/;
112: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
113: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$)/) ||
114: ($requrl=~/^\/adm\/wrapper\//) ||
115: ($requrl=~m|\.problem/smpedit$|) ||
116: ($requrl=~/^\/public\/.*\/syllabus$/)) {
117: # ------------------------------------- This is serious stuff, get symb and log
118: my $query=$r->args;
119: my $symb;
120: if ($query) {
121: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
122: }
123: if ($ENV{'form.symb'}) {
124: $symb=&Apache::lonnet::symbclean($ENV{'form.symb'});
125: if ($requrl =~ m|^/adm/wrapper/|) {
126: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
127: &Apache::lonnet::symblist($map,$murl => $mid,
128: 'last_known' => $murl);
129: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
130: (($requrl=~m|(.*)/smpedit$|) &&
131: &Apache::lonnet::symbverify($symb,$1))) {
132: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
133: &Apache::lonnet::symblist($map,$murl => $mid,
134: 'last_known' => $murl);
135: } else {
136: $r->log_reason('Invalid symb for '.$requrl.': '.
137: $symb);
138: $ENV{'user.error.msg'}=
139: "$requrl:bre:1:1:Invalid Access";
140: return HTTP_NOT_ACCEPTABLE;
141: }
142: } else {
143: $symb=&Apache::lonnet::symbread($requrl);
144: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
145: !&Apache::lonnet::symbverify($symb,$requrl)) {
146: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
147: $ENV{'user.error.msg'}=
148: "$requrl:bre:1:1:Invalid Access";
149: return HTTP_NOT_ACCEPTABLE;
150: }
151: my ($map,$mid,$murl)=split(/\_\_\_/,$symb);
152: &Apache::lonnet::symblist($map,$murl => $mid,
153: 'last_known' => $murl);
154: }
155: $ENV{'request.symb'}=$symb;
156: &Apache::lonnet::courseacclog($symb);
157: } else {
158: # ------------------------------------------------------- This is other content
159: &Apache::lonnet::courseacclog($requrl);
160: }
161: }
162: return OK;
163: } else {
164: $r->log_reason("Cookie $handle not valid", $r->filename)
165: };
166: }
167:
168: # -------------------------------------------- See if this is a public resource
169: if ($requrl=~m|^/public/|
170: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
171: &Apache::lonnet::logthis('Granting public access: '.$requrl);
172: &Apache::loncommon::get_posted_cgi($r);
173: $ENV{'user.name'}='public';
174: $ENV{'user.domain'}='public';
175: $ENV{'request.state'} = "published";
176: $ENV{'request.publicaccess'} = 1;
177: $ENV{'request.filename'} = $r->filename;
178: my ($httpbrowser, $clientbrowser, $clientversion,
179: $clientmathml, $clientunicode, $clientos) =
180: &Apache::loncommon::decode_user_agent($r);
181: $ENV{'browser.type'}=$clientbrowser;
182: $ENV{'browser.version'}=$clientversion;
183: $ENV{'browser.mathml'}=$clientmathml;
184: $ENV{'browser.unicode'}=$clientunicode;
185: $ENV{'browser.os'}=$clientos;
186:
187: return OK;
188: }
189: # -------------------------------------------------------------- Not authorized
190: $requrl=~/\.(\w+)$/;
191: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
192: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
193: # ($requrl=~m|^/prtspool/|)) {
194: # -------------------------- Store where they wanted to go and get login screen
195: $ENV{'request.querystring'}=$r->args;
196: $ENV{'request.firsturl'}=$requrl;
197: return FORBIDDEN;
198: # } else {
199: # --------------------------------------------------------------------- Goodbye
200: # return HTTP_BAD_REQUEST;
201: # }
202: }
203:
204: 1;
205: __END__
206:
207: =head1 NAME
208:
209: Apache::lonacc - Cookie Based Access Handler
210:
211: =head1 SYNOPSIS
212:
213: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
214:
215: PerlAccessHandler Apache::lonacc
216:
217: =head1 INTRODUCTION
218:
219: This module enables cookie based authentication and is used
220: to control access for many different LON-CAPA URIs.
221:
222: Whenever the client sends the cookie back to the server,
223: this cookie is handled by either lonacc.pm or loncacc.pm
224: (see srm.conf for what is invoked when). If
225: the cookie is missing or invalid, the user is re-challenged
226: for login information.
227:
228: This is part of the LearningOnline Network with CAPA project
229: described at http://www.lon-capa.org.
230:
231: =head1 HANDLER SUBROUTINE
232:
233: This routine is called by Apache and mod_perl.
234:
235: =over 4
236:
237: =item *
238:
239: transfer profile into environment
240:
241: =item *
242:
243: load POST parameters
244:
245: =item *
246:
247: check access
248:
249: =item *
250:
251: if allowed, get symb, log, generate course statistics if applicable
252:
253: =item *
254:
255: otherwise return error
256:
257: =item *
258:
259: see if public resource
260:
261: =item *
262:
263: store attempted access
264:
265: =back
266:
267: =cut
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