1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.74 2006/04/05 22:39:55 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: my $lonidsdir=$r->dir_config('lonIDsDir');
48:
49: my $handle;
50: if ($lonid) {
51: $handle=$lonid->value;
52: $handle=~s/\W//g;
53: }
54:
55: if ($r->user
56: && (!$lonid || !-e "$lonidsdir/$handle.id" || $handle eq '') ) {
57: my $domain = $r->dir_config('lonDefDomain');
58: my $home=&Apache::lonnet::homeserver($r->user,$domain);
59: if ($home !~ /(con_lost|no_such_host)/) {
60: $handle=&Apache::lonauth::success($r,$r->user,$domain,
61: $home,'noredirect');
62: $r->header_out('Set-cookie',"lonID=$handle; path=/");
63: }
64: }
65:
66: if ($r->dir_config("lonBalancer") eq 'yes') {
67: $r->set_handlers('PerlResponseHandler'=>
68: [\&Apache::switchserver::handler]);
69: }
70:
71: if ($handle ne '') {
72: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
73:
74: # ------------------------------------------------------ Initialize Environment
75:
76: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
77:
78: # --------------------------------------------------------- Initialize Language
79:
80: &Apache::lonlocal::get_language_handle($r);
81:
82: # -------------------------------------------------------------- Resource State
83:
84: if ($requrl=~/^\/+(res|uploaded)\//) {
85: $env{'request.state'} = "published";
86: } else {
87: $env{'request.state'} = 'unknown';
88: }
89: $env{'request.filename'} = $r->filename;
90: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
91: # -------------------------------------------------------- Load POST parameters
92:
93: &Apache::loncommon::get_posted_cgi($r);
94:
95: # ---------------------------------------------------------------- Check access
96:
97: if ($requrl!~/^\/adm|public|prtspool\//) {
98: my $access=&Apache::lonnet::allowed('bre',$requrl);
99: if ($access eq '1') {
100: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
101: return HTTP_NOT_ACCEPTABLE;
102: }
103: if (($access ne '2') && ($access ne 'F')) {
104: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
105: return HTTP_NOT_ACCEPTABLE;
106: }
107: }
108: if ($requrl =~ m|^/prtspool/|) {
109: my $start='/prtspool/'.$env{'user.name'}.'_'.
110: $env{'user.domain'};
111: if ($requrl !~ /^\Q$start\E/) {
112: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
113: return HTTP_NOT_ACCEPTABLE;
114: }
115: }
116: if ($env{'user.name'} eq 'public' &&
117: $env{'user.domain'} eq 'public' &&
118: $requrl !~ m{^/+(res|public)/} &&
119: $requrl !~ m{^/+adm/(help|logout|randomlabel\.png)}) {
120: $env{'request.querystring'}=$r->args;
121: $env{'request.firsturl'}=$requrl;
122: return FORBIDDEN;
123: }
124: # ------------------------------------------------------------- This is allowed
125: if ($env{'request.course.id'}) {
126: &Apache::lonnet::countacc($requrl);
127: $requrl=~/\.(\w+)$/;
128: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
129: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$)/) ||
130: ($requrl=~/^\/adm\/wrapper\//) ||
131: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
132: ($requrl=~m|\.problem/smpedit$|) ||
133: ($requrl=~/^\/public\/.*\/syllabus$/)) {
134: # ------------------------------------- This is serious stuff, get symb and log
135: my $query=$r->args;
136: my $symb;
137: if ($query) {
138: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
139: }
140: if ($env{'form.symb'}) {
141: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
142: if ($requrl =~ m|^/adm/wrapper/|
143: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
144: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
145: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
146: 'last_known' =>[$murl,$mid]);
147: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
148: (($requrl=~m|(.*)/smpedit$|) &&
149: &Apache::lonnet::symbverify($symb,$1))) {
150: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
151: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
152: 'last_known' =>[$murl,$mid]);
153: } else {
154: $r->log_reason('Invalid symb for '.$requrl.': '.
155: $symb);
156: $env{'user.error.msg'}=
157: "$requrl:bre:1:1:Invalid Access";
158: return HTTP_NOT_ACCEPTABLE;
159: }
160: } else {
161: $symb=&Apache::lonnet::symbread($requrl);
162: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
163: !&Apache::lonnet::symbverify($symb,$requrl)) {
164: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
165: $env{'user.error.msg'}=
166: "$requrl:bre:1:1:Invalid Access";
167: return HTTP_NOT_ACCEPTABLE;
168: }
169: if ($symb) {
170: my ($map,$mid,$murl)=
171: &Apache::lonnet::decode_symb($symb);
172: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
173: 'last_known' =>[$murl,$mid]);
174: }
175: }
176: $env{'request.symb'}=$symb;
177: &Apache::lonnet::courseacclog($symb);
178: } else {
179: # ------------------------------------------------------- This is other content
180: &Apache::lonnet::courseacclog($requrl);
181: }
182: }
183: return OK;
184: } else {
185: $r->log_reason("Cookie $handle not valid", $r->filename);
186: }
187: }
188:
189: # -------------------------------------------- See if this is a public resource
190: if ($requrl=~m|^/public/|
191: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
192: &Apache::lonnet::logthis('Granting public access: '.$requrl);
193: &Apache::lonlocal::get_language_handle($r);
194: my $cookie=
195: &Apache::lonauth::success($r,'public','public','public');
196: my $lonidsdir=$r->dir_config('lonIDsDir');
197: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$cookie);
198: &Apache::loncommon::get_posted_cgi($r);
199: $env{'request.state'} = "published";
200: $env{'request.publicaccess'} = 1;
201: $env{'request.filename'} = $r->filename;
202:
203: $r->header_out('Set-cookie',"lonID=$cookie; path=/");
204: return OK;
205: }
206: if ($requrl=~m|^/+adm/+help/+|) {
207: return OK;
208: }
209: # -------------------------------------------------------------- Not authorized
210: $requrl=~/\.(\w+)$/;
211: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
212: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
213: # ($requrl=~m|^/prtspool/|)) {
214: # -------------------------- Store where they wanted to go and get login screen
215: $env{'request.querystring'}=$r->args;
216: $env{'request.firsturl'}=$requrl;
217: return FORBIDDEN;
218: # } else {
219: # --------------------------------------------------------------------- Goodbye
220: # return HTTP_BAD_REQUEST;
221: # }
222: }
223:
224: 1;
225: __END__
226:
227: =head1 NAME
228:
229: Apache::lonacc - Cookie Based Access Handler
230:
231: =head1 SYNOPSIS
232:
233: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
234:
235: PerlAccessHandler Apache::lonacc
236:
237: =head1 INTRODUCTION
238:
239: This module enables cookie based authentication and is used
240: to control access for many different LON-CAPA URIs.
241:
242: Whenever the client sends the cookie back to the server,
243: this cookie is handled by either lonacc.pm or loncacc.pm
244: (see srm.conf for what is invoked when). If
245: the cookie is missing or invalid, the user is re-challenged
246: for login information.
247:
248: This is part of the LearningOnline Network with CAPA project
249: described at http://www.lon-capa.org.
250:
251: =head1 HANDLER SUBROUTINE
252:
253: This routine is called by Apache and mod_perl.
254:
255: =over 4
256:
257: =item *
258:
259: transfer profile into environment
260:
261: =item *
262:
263: load POST parameters
264:
265: =item *
266:
267: check access
268:
269: =item *
270:
271: if allowed, get symb, log, generate course statistics if applicable
272:
273: =item *
274:
275: otherwise return error
276:
277: =item *
278:
279: see if public resource
280:
281: =item *
282:
283: store attempted access
284:
285: =back
286:
287: =cut
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