1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.65 2005/04/22 20:55:40 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: ###
29:
30: package Apache::lonacc;
31:
32: use strict;
33: use Apache::Constants qw(:common :http :methods);
34: use Apache::File;
35: use Apache::lonnet;
36: use Apache::loncommon();
37: use Apache::lonlocal;
38: use CGI::Cookie();
39: use Fcntl qw(:flock);
40:
41: sub handler {
42: my $r = shift;
43: my $requrl=$r->uri;
44: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
45: my $lonid=$cookies{'lonID'};
46: my $cookie;
47: if ($lonid) {
48: my $handle=$lonid->value;
49: $handle=~s/\W//g;
50: my $lonidsdir=$r->dir_config('lonIDsDir');
51: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
52:
53: # ------------------------------------------------------ Initialize Environment
54:
55: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
56:
57: # --------------------------------------------------------- Initialize Language
58:
59: &Apache::lonlocal::get_language_handle($r);
60:
61: # -------------------------------------------------------------- Resource State
62:
63: if ($requrl=~/^\/+(res|uploaded)\//) {
64: $env{'request.state'} = "published";
65: } else {
66: $env{'request.state'} = 'unknown';
67: }
68: $env{'request.filename'} = $r->filename;
69: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
70: # -------------------------------------------------------- Load POST parameters
71:
72: &Apache::loncommon::get_posted_cgi($r);
73:
74: # ---------------------------------------------------------------- Check access
75:
76: if ($requrl!~/^\/adm|public|prtspool\//) {
77: my $access=&Apache::lonnet::allowed('bre',$requrl);
78: if ($access eq '1') {
79: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
80: return HTTP_NOT_ACCEPTABLE;
81: }
82: if (($access ne '2') && ($access ne 'F')) {
83: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
84: return HTTP_NOT_ACCEPTABLE;
85: }
86: }
87: if ($requrl =~ m|^/prtspool/|) {
88: my $start='/prtspool/'.$env{'user.name'}.'_'.
89: $env{'user.domain'};
90: if ($requrl !~ /^\Q$start\E/) {
91: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
92: return HTTP_NOT_ACCEPTABLE;
93: }
94: }
95: # ------------------------------------------------------------- This is allowed
96: if ($env{'request.course.id'}) {
97: &Apache::lonnet::countacc($requrl);
98: $requrl=~/\.(\w+)$/;
99: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
100: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$)/) ||
101: ($requrl=~/^\/adm\/wrapper\//) ||
102: ($requrl=~m|\.problem/smpedit$|) ||
103: ($requrl=~/^\/public\/.*\/syllabus$/)) {
104: # ------------------------------------- This is serious stuff, get symb and log
105: my $query=$r->args;
106: my $symb;
107: if ($query) {
108: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
109: }
110: if ($env{'form.symb'}) {
111: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
112: if ($requrl =~ m|^/adm/wrapper/|) {
113: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
114: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
115: 'last_known' =>[$murl,$mid]);
116: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
117: (($requrl=~m|(.*)/smpedit$|) &&
118: &Apache::lonnet::symbverify($symb,$1))) {
119: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
120: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
121: 'last_known' =>[$murl,$mid]);
122: } else {
123: $r->log_reason('Invalid symb for '.$requrl.': '.
124: $symb);
125: $env{'user.error.msg'}=
126: "$requrl:bre:1:1:Invalid Access";
127: return HTTP_NOT_ACCEPTABLE;
128: }
129: } else {
130: $symb=&Apache::lonnet::symbread($requrl);
131: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
132: !&Apache::lonnet::symbverify($symb,$requrl)) {
133: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
134: $env{'user.error.msg'}=
135: "$requrl:bre:1:1:Invalid Access";
136: return HTTP_NOT_ACCEPTABLE;
137: }
138: if ($symb) {
139: my ($map,$mid,$murl)=
140: &Apache::lonnet::decode_symb($symb);
141: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
142: 'last_known' =>[$murl,$mid]);
143: }
144: }
145: $env{'request.symb'}=$symb;
146: &Apache::lonnet::courseacclog($symb);
147: } else {
148: # ------------------------------------------------------- This is other content
149: &Apache::lonnet::courseacclog($requrl);
150: }
151: }
152: return OK;
153: } else {
154: $r->log_reason("Cookie $handle not valid", $r->filename)
155: };
156: }
157:
158: # -------------------------------------------- See if this is a public resource
159: if ($requrl=~m|^/public/|
160: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
161: &Apache::lonnet::logthis('Granting public access: '.$requrl);
162: &Apache::loncommon::get_posted_cgi($r);
163: $env{'user.name'}='public';
164: $env{'user.domain'}='public';
165: $env{'request.state'} = "published";
166: $env{'request.publicaccess'} = 1;
167: $env{'request.filename'} = $r->filename;
168: my ($httpbrowser, $clientbrowser, $clientversion,
169: $clientmathml, $clientunicode, $clientos) =
170: &Apache::loncommon::decode_user_agent($r);
171: $env{'browser.type'}=$clientbrowser;
172: $env{'browser.version'}=$clientversion;
173: $env{'browser.mathml'}=$clientmathml;
174: $env{'browser.unicode'}=$clientunicode;
175: $env{'browser.os'}=$clientos;
176:
177: return OK;
178: }
179: # -------------------------------------------------------------- Not authorized
180: $requrl=~/\.(\w+)$/;
181: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
182: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
183: # ($requrl=~m|^/prtspool/|)) {
184: # -------------------------- Store where they wanted to go and get login screen
185: $env{'request.querystring'}=$r->args;
186: $env{'request.firsturl'}=$requrl;
187: return FORBIDDEN;
188: # } else {
189: # --------------------------------------------------------------------- Goodbye
190: # return HTTP_BAD_REQUEST;
191: # }
192: }
193:
194: 1;
195: __END__
196:
197: =head1 NAME
198:
199: Apache::lonacc - Cookie Based Access Handler
200:
201: =head1 SYNOPSIS
202:
203: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
204:
205: PerlAccessHandler Apache::lonacc
206:
207: =head1 INTRODUCTION
208:
209: This module enables cookie based authentication and is used
210: to control access for many different LON-CAPA URIs.
211:
212: Whenever the client sends the cookie back to the server,
213: this cookie is handled by either lonacc.pm or loncacc.pm
214: (see srm.conf for what is invoked when). If
215: the cookie is missing or invalid, the user is re-challenged
216: for login information.
217:
218: This is part of the LearningOnline Network with CAPA project
219: described at http://www.lon-capa.org.
220:
221: =head1 HANDLER SUBROUTINE
222:
223: This routine is called by Apache and mod_perl.
224:
225: =over 4
226:
227: =item *
228:
229: transfer profile into environment
230:
231: =item *
232:
233: load POST parameters
234:
235: =item *
236:
237: check access
238:
239: =item *
240:
241: if allowed, get symb, log, generate course statistics if applicable
242:
243: =item *
244:
245: otherwise return error
246:
247: =item *
248:
249: see if public resource
250:
251: =item *
252:
253: store attempted access
254:
255: =back
256:
257: =cut
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