1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.75 2006/04/07 22:42:00 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 cleanup {
42: my ($r)=@_;
43: if (! $r->is_initial_req()) { return DECLINED; }
44: &Apache::lonnet::save_cache();
45: return OK;
46: }
47:
48: sub goodbye {
49: my ($r)=@_;
50: &Apache::lonnet::goodbye();
51: return DONE;
52: }
53:
54: sub handler {
55: my $r = shift;
56: my $requrl=$r->uri;
57: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
58: my $lonid=$cookies{'lonID'};
59: my $cookie;
60: my $lonidsdir=$r->dir_config('lonIDsDir');
61:
62: my $handle;
63: if ($lonid) {
64: $handle=$lonid->value;
65: $handle=~s/\W//g;
66: }
67:
68: if ($r->user
69: && (!$lonid || !-e "$lonidsdir/$handle.id" || $handle eq '') ) {
70: my $domain = $r->dir_config('lonDefDomain');
71: my $home=&Apache::lonnet::homeserver($r->user,$domain);
72: if ($home !~ /(con_lost|no_such_host)/) {
73: $handle=&Apache::lonauth::success($r,$r->user,$domain,
74: $home,'noredirect');
75: $r->header_out('Set-cookie',"lonID=$handle; path=/");
76: }
77: }
78:
79: if ($r->dir_config("lonBalancer") eq 'yes') {
80: $r->set_handlers('PerlResponseHandler'=>
81: [\&Apache::switchserver::handler]);
82: }
83:
84: if ($handle ne '') {
85: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
86:
87: # ------------------------------------------------------ Initialize Environment
88:
89: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
90:
91: # --------------------------------------------------------- Initialize Language
92:
93: &Apache::lonlocal::get_language_handle($r);
94:
95: # -------------------------------------------------------------- Resource State
96:
97: if ($requrl=~/^\/+(res|uploaded)\//) {
98: $env{'request.state'} = "published";
99: } else {
100: $env{'request.state'} = 'unknown';
101: }
102: $env{'request.filename'} = $r->filename;
103: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
104: # -------------------------------------------------------- Load POST parameters
105:
106: &Apache::loncommon::get_posted_cgi($r);
107:
108: # ---------------------------------------------------------------- Check access
109:
110: if ($requrl!~/^\/adm|public|prtspool\//) {
111: my $access=&Apache::lonnet::allowed('bre',$requrl);
112: if ($access eq '1') {
113: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
114: return HTTP_NOT_ACCEPTABLE;
115: }
116: if (($access ne '2') && ($access ne 'F')) {
117: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
118: return HTTP_NOT_ACCEPTABLE;
119: }
120: }
121: if ($requrl =~ m|^/prtspool/|) {
122: my $start='/prtspool/'.$env{'user.name'}.'_'.
123: $env{'user.domain'};
124: if ($requrl !~ /^\Q$start\E/) {
125: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
126: return HTTP_NOT_ACCEPTABLE;
127: }
128: }
129: if ($env{'user.name'} eq 'public' &&
130: $env{'user.domain'} eq 'public' &&
131: $requrl !~ m{^/+(res|public)/} &&
132: $requrl !~ m{^/+adm/(help|logout|randomlabel\.png)}) {
133: $env{'request.querystring'}=$r->args;
134: $env{'request.firsturl'}=$requrl;
135: return FORBIDDEN;
136: }
137: # ------------------------------------------------------------- This is allowed
138: if ($env{'request.course.id'}) {
139: &Apache::lonnet::countacc($requrl);
140: $requrl=~/\.(\w+)$/;
141: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
142: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$)/) ||
143: ($requrl=~/^\/adm\/wrapper\//) ||
144: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
145: ($requrl=~m|\.problem/smpedit$|) ||
146: ($requrl=~/^\/public\/.*\/syllabus$/)) {
147: # ------------------------------------- This is serious stuff, get symb and log
148: my $query=$r->args;
149: my $symb;
150: if ($query) {
151: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
152: }
153: if ($env{'form.symb'}) {
154: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
155: if ($requrl =~ m|^/adm/wrapper/|
156: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
157: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
158: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
159: 'last_known' =>[$murl,$mid]);
160: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
161: (($requrl=~m|(.*)/smpedit$|) &&
162: &Apache::lonnet::symbverify($symb,$1))) {
163: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
164: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
165: 'last_known' =>[$murl,$mid]);
166: } else {
167: $r->log_reason('Invalid symb for '.$requrl.': '.
168: $symb);
169: $env{'user.error.msg'}=
170: "$requrl:bre:1:1:Invalid Access";
171: return HTTP_NOT_ACCEPTABLE;
172: }
173: } else {
174: $symb=&Apache::lonnet::symbread($requrl);
175: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
176: !&Apache::lonnet::symbverify($symb,$requrl)) {
177: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
178: $env{'user.error.msg'}=
179: "$requrl:bre:1:1:Invalid Access";
180: return HTTP_NOT_ACCEPTABLE;
181: }
182: if ($symb) {
183: my ($map,$mid,$murl)=
184: &Apache::lonnet::decode_symb($symb);
185: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
186: 'last_known' =>[$murl,$mid]);
187: }
188: }
189: $env{'request.symb'}=$symb;
190: &Apache::lonnet::courseacclog($symb);
191: } else {
192: # ------------------------------------------------------- This is other content
193: &Apache::lonnet::courseacclog($requrl);
194: }
195: }
196: return OK;
197: } else {
198: $r->log_reason("Cookie $handle not valid", $r->filename);
199: }
200: }
201:
202: # -------------------------------------------- See if this is a public resource
203: if ($requrl=~m|^/public/|
204: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
205: &Apache::lonnet::logthis('Granting public access: '.$requrl);
206: &Apache::lonlocal::get_language_handle($r);
207: my $cookie=
208: &Apache::lonauth::success($r,'public','public','public');
209: my $lonidsdir=$r->dir_config('lonIDsDir');
210: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$cookie);
211: &Apache::loncommon::get_posted_cgi($r);
212: $env{'request.state'} = "published";
213: $env{'request.publicaccess'} = 1;
214: $env{'request.filename'} = $r->filename;
215:
216: $r->header_out('Set-cookie',"lonID=$cookie; path=/");
217: return OK;
218: }
219: if ($requrl=~m|^/+adm/+help/+|) {
220: return OK;
221: }
222: # -------------------------------------------------------------- Not authorized
223: $requrl=~/\.(\w+)$/;
224: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
225: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
226: # ($requrl=~m|^/prtspool/|)) {
227: # -------------------------- Store where they wanted to go and get login screen
228: $env{'request.querystring'}=$r->args;
229: $env{'request.firsturl'}=$requrl;
230: return FORBIDDEN;
231: # } else {
232: # --------------------------------------------------------------------- Goodbye
233: # return HTTP_BAD_REQUEST;
234: # }
235: }
236:
237: 1;
238: __END__
239:
240: =head1 NAME
241:
242: Apache::lonacc - Cookie Based Access Handler
243:
244: =head1 SYNOPSIS
245:
246: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
247:
248: PerlAccessHandler Apache::lonacc
249:
250: =head1 INTRODUCTION
251:
252: This module enables cookie based authentication and is used
253: to control access for many different LON-CAPA URIs.
254:
255: Whenever the client sends the cookie back to the server,
256: this cookie is handled by either lonacc.pm or loncacc.pm
257: (see srm.conf for what is invoked when). If
258: the cookie is missing or invalid, the user is re-challenged
259: for login information.
260:
261: This is part of the LearningOnline Network with CAPA project
262: described at http://www.lon-capa.org.
263:
264: =head1 HANDLER SUBROUTINE
265:
266: This routine is called by Apache and mod_perl.
267:
268: =over 4
269:
270: =item *
271:
272: transfer profile into environment
273:
274: =item *
275:
276: load POST parameters
277:
278: =item *
279:
280: check access
281:
282: =item *
283:
284: if allowed, get symb, log, generate course statistics if applicable
285:
286: =item *
287:
288: otherwise return error
289:
290: =item *
291:
292: see if public resource
293:
294: =item *
295:
296: store attempted access
297:
298: =back
299:
300: =cut
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