1: # The LearningOnline Network
2: # Cookie Based Access Handler for Construction Area
3: # (lonacc: 5/21/99,5/22,5/29,5/31 Gerd Kortemeyer)
4: #
5: # $Id: loncacc.pm,v 1.59 2011/11/12 19:37:40 raeburn Exp $
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29:
30: =pod
31:
32: =head1 NAME
33:
34: Apache::lonacc - Cookie Based Access Handler for Construction Area
35:
36: =head1 SYNOPSIS
37:
38: Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf:
39:
40: PerlAccessHandler Apache::loncacc
41:
42: =head1 INTRODUCTION
43:
44: This module enables cookie based authentication for construction area
45: and is used to control access for the following two types of URI
46: (one for files, and one for directories):
47:
48: <LocationMatch "^/priv.*">
49: <LocationMatch "^/priv.*/$">
50:
51: Whenever the client sends the cookie back to the server,
52: if the cookie is missing or invalid, the user is re-challenged
53: for login information.
54:
55: This is part of the LearningOnline Network with CAPA project
56: described at http://www.lon-capa.org.
57:
58: =head1 HANDLER SUBROUTINE
59:
60: This routine is called by Apache and mod_perl.
61:
62: =over 4
63:
64: =item *
65:
66: load POST parameters
67:
68: =item *
69:
70: store where they wanted to go (first url entered)
71:
72: =back
73:
74: =head1 OTHERSUBROUTINES
75:
76: =over
77:
78: =item constructaccess($url,$setpriv)
79:
80: See if the owner domain and name
81: in the URL match those in the expected environment. If so, return
82: three element list ($ownername,$ownerdomain,$ownerhome).
83:
84: Otherwise return the null string.
85:
86: If second argument 'setpriv' is true, it assigns the privileges,
87: and returns the same three element list, unless the owner has
88: blocked "ad hoc" Domain Coordinator access to the Author Space,
89: in which case the null string is returned.
90:
91: =back
92:
93: =cut
94:
95:
96: package Apache::loncacc;
97:
98: use strict;
99: use Apache::Constants qw(:common :http :methods REDIRECT);
100: use Fcntl qw(:flock);
101: use Apache::lonlocal;
102: use Apache::lonnet;
103: use Apache::lonacc;
104: use LONCAPA qw(:DEFAULT :match);
105:
106: sub constructaccess {
107: my ($url,$setpriv)=@_;
108:
109: # We do not allow editing of previous versions of files
110: if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
111:
112: # Get username and domain from URL
113: my $londocroot = $Apache::lonnet::perlvar{'lonDocRoot'};
114: my ($ownername,$ownerdomain,$ownerhome);
115:
116: ($ownerdomain,$ownername) =
117: ($url=~ m{^(?:\Q$londocroot\E|)/priv/($match_domain)/($match_username)/});
118:
119: # The URL does not really point to any authorspace, forget it
120: unless (($ownername) && ($ownerdomain)) { return ''; }
121:
122: # Now we need to see if the user has access to the authorspace of
123: # $ownername at $ownerdomain
124:
125: if (($ownername eq $env{'user.name'}) && ($ownerdomain eq $env{'user.domain'})) {
126: # Real author for this?
127: $ownerhome = $env{'user.home'};
128: if (exists($env{'user.priv.au./'.$ownerdomain.'/./'})) {
129: return ($ownername,$ownerdomain,$ownerhome);
130: }
131: } else {
132: # Co-author for this?
133: if (exists($env{'user.priv.ca./'.$ownerdomain.'/'.$ownername.'./'}) ||
134: exists($env{'user.priv.aa./'.$ownerdomain.'/'.$ownername.'./'}) ) {
135: $ownerhome = &Apache::lonnet::homeserver($ownername,$ownerdomain);
136: return ($ownername,$ownerdomain,$ownerhome);
137: }
138: }
139: # We don't have any access right now. If we are not possibly going to do anything about this,
140: # we might as well leave
141: unless ($setpriv) { return ''; }
142:
143: # Backdoor access?
144: my $allowed=&Apache::lonnet::allowed('eco',$ownerdomain);
145: # Nope
146: unless ($allowed) { return ''; }
147: # Looks like we may have access, but could be locked by the owner of the construction space
148: if ($allowed eq 'U') {
149: my %blocked=&Apache::lonnet::get('environment',['domcoord.author'],
150: $ownerdomain,$ownername);
151: # Is blocked by owner
152: if ($blocked{'domcoord.author'} eq 'blocked') { return ''; }
153: }
154: if (($allowed eq 'F') || ($allowed eq 'U')) {
155: # Grant temporary access
156: my $then=$env{'user.login.time'};
157: my $update==$env{'user.update.time'};
158: if (!$update) { $update = $then; }
159: my $refresh=$env{'user.refresh.time'};
160: if (!$refresh) { $refresh = $update; }
161: my $now = time;
162: &Apache::lonnet::check_adhoc_privs($ownerdomain,$ownername,
163: $update,$refresh,$now,'ca',
164: 'constructaccess');
165: $ownerhome = &Apache::lonnet::homeserver($ownername,$ownerdomain);
166: return($ownername,$ownerdomain,$ownerhome);
167: }
168: # No business here
169: return '';
170: }
171:
172: sub handler {
173: my $r = shift;
174: my $requrl=$r->uri;
175: $env{'request.editurl'}=$requrl;
176:
177: my $handle = &Apache::lonnet::check_for_valid_session($r);
178: if ($handle ne '') {
179:
180: # ------------------------------------------------------ Initialize Environment
181: my $lonidsdir=$r->dir_config('lonIDsDir');
182: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
183:
184: # --------------------------------------------------------- Initialize Language
185:
186: &Apache::lonlocal::get_language_handle($r);
187:
188: # -------------------------------------------------------------- Resource State
189:
190: $env{'request.state'} = "construct";
191: $env{'request.filename'} = $r->filename;
192:
193: my $allowed;
194: my ($ownername,$ownerdom,$ownerhome) = &constructaccess($requrl,'setpriv');
195: if (($ownername ne '') && ($ownerdom ne '') && ($ownerhome ne '')) {
196: unless ($ownerhome eq 'no_host') {
197: my @hosts = &Apache::lonnet::current_machine_ids();
198: if (grep(/^\Q$ownerhome\E$/,@hosts)) {
199: $allowed = 1;
200: }
201: }
202: }
203:
204: unless ($allowed) {
205: $r->log_reason("Unauthorized $requrl", $r->filename);
206: return HTTP_NOT_ACCEPTABLE;
207: }
208:
209: # -------------------------------------------------------- Load POST parameters
210:
211: &Apache::lonacc::get_posted_cgi($r);
212:
213: return OK;
214: } else {
215: $r->log_reason("Cookie $handle not valid", $r->filename)
216: }
217:
218: # ----------------------------------------------- Store where they wanted to go
219:
220: $env{'request.firsturl'}=$requrl;
221: return FORBIDDEN;
222: }
223:
224: 1;
225: __END__
226:
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