1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.67 2005/07/07 05:53:35 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: if ($env{'user.name'} eq 'public' &&
96: $env{'user.domain'} eq 'public' &&
97: $requrl !~ m{^/+(res|public)/} &&
98: $requrl !~ m{^/+adm/(roles|logout|randomlabel\.png)}) {
99: $env{'request.querystring'}=$r->args;
100: $env{'request.firsturl'}=$requrl;
101: return FORBIDDEN;
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: ($requrl=~m|\.problem/smpedit$|) ||
111: ($requrl=~/^\/public\/.*\/syllabus$/)) {
112: # ------------------------------------- This is serious stuff, get symb and log
113: my $query=$r->args;
114: my $symb;
115: if ($query) {
116: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
117: }
118: if ($env{'form.symb'}) {
119: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
120: if ($requrl =~ m|^/adm/wrapper/|) {
121: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
122: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
123: 'last_known' =>[$murl,$mid]);
124: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
125: (($requrl=~m|(.*)/smpedit$|) &&
126: &Apache::lonnet::symbverify($symb,$1))) {
127: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
128: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
129: 'last_known' =>[$murl,$mid]);
130: } else {
131: $r->log_reason('Invalid symb for '.$requrl.': '.
132: $symb);
133: $env{'user.error.msg'}=
134: "$requrl:bre:1:1:Invalid Access";
135: return HTTP_NOT_ACCEPTABLE;
136: }
137: } else {
138: $symb=&Apache::lonnet::symbread($requrl);
139: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
140: !&Apache::lonnet::symbverify($symb,$requrl)) {
141: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
142: $env{'user.error.msg'}=
143: "$requrl:bre:1:1:Invalid Access";
144: return HTTP_NOT_ACCEPTABLE;
145: }
146: if ($symb) {
147: my ($map,$mid,$murl)=
148: &Apache::lonnet::decode_symb($symb);
149: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
150: 'last_known' =>[$murl,$mid]);
151: }
152: }
153: $env{'request.symb'}=$symb;
154: &Apache::lonnet::courseacclog($symb);
155: } else {
156: # ------------------------------------------------------- This is other content
157: &Apache::lonnet::courseacclog($requrl);
158: }
159: }
160: return OK;
161: } else {
162: $r->log_reason("Cookie $handle not valid", $r->filename)
163: };
164: }
165:
166: # -------------------------------------------- See if this is a public resource
167: if ($requrl=~m|^/public/|
168: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
169: &Apache::lonnet::logthis('Granting public access: '.$requrl);
170: my $cookie=
171: &Apache::lonauth::success($r,'public','public','public');
172: my $lonidsdir=$r->dir_config('lonIDsDir');
173: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$cookie);
174: &Apache::loncommon::get_posted_cgi($r);
175: $env{'request.state'} = "published";
176: $env{'request.publicaccess'} = 1;
177: $env{'request.filename'} = $r->filename;
178:
179: $r->header_out('Set-cookie',"lonID=$cookie; path=/");
180: return OK;
181: }
182: # -------------------------------------------------------------- Not authorized
183: $requrl=~/\.(\w+)$/;
184: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
185: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
186: # ($requrl=~m|^/prtspool/|)) {
187: # -------------------------- Store where they wanted to go and get login screen
188: $env{'request.querystring'}=$r->args;
189: $env{'request.firsturl'}=$requrl;
190: return FORBIDDEN;
191: # } else {
192: # --------------------------------------------------------------------- Goodbye
193: # return HTTP_BAD_REQUEST;
194: # }
195: }
196:
197: 1;
198: __END__
199:
200: =head1 NAME
201:
202: Apache::lonacc - Cookie Based Access Handler
203:
204: =head1 SYNOPSIS
205:
206: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
207:
208: PerlAccessHandler Apache::lonacc
209:
210: =head1 INTRODUCTION
211:
212: This module enables cookie based authentication and is used
213: to control access for many different LON-CAPA URIs.
214:
215: Whenever the client sends the cookie back to the server,
216: this cookie is handled by either lonacc.pm or loncacc.pm
217: (see srm.conf for what is invoked when). If
218: the cookie is missing or invalid, the user is re-challenged
219: for login information.
220:
221: This is part of the LearningOnline Network with CAPA project
222: described at http://www.lon-capa.org.
223:
224: =head1 HANDLER SUBROUTINE
225:
226: This routine is called by Apache and mod_perl.
227:
228: =over 4
229:
230: =item *
231:
232: transfer profile into environment
233:
234: =item *
235:
236: load POST parameters
237:
238: =item *
239:
240: check access
241:
242: =item *
243:
244: if allowed, get symb, log, generate course statistics if applicable
245:
246: =item *
247:
248: otherwise return error
249:
250: =item *
251:
252: see if public resource
253:
254: =item *
255:
256: store attempted access
257:
258: =back
259:
260: =cut
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