1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.37 2002/11/06 22:43:27 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: # YEAR=1999
29: # 5/21/99,5/22,5/29,5/31,6/15,16/11,22/11,
30: # YEAR=2000
31: # 01/06,01/13,05/31,06/01,09/06,09/25,09/28,10/30,11/6,
32: # 12/25,12/26,
33: # YEAR=2001
34: # 01/06/01,05/28,8/11,9/26,11/29 Gerd Kortemeyer
35: # 12/15 Scott Harrison
36: # YEAR=2002
37: # 1/4,2/25 Gerd Kortemeyer
38: #
39: ###
40:
41: package Apache::lonacc;
42:
43: use strict;
44: use Apache::Constants qw(:common :http :methods);
45: use Apache::File;
46: use Apache::lonnet;
47: use Apache::loncommon();
48: use CGI::Cookie();
49: use Fcntl qw(:flock);
50:
51: sub handler {
52: my $r = shift;
53: my $requrl=$r->uri;
54: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
55: my $lonid=$cookies{'lonID'};
56: my $cookie;
57: if ($lonid) {
58: my $handle=$lonid->value;
59: $handle=~s/\W//g;
60: my $lonidsdir=$r->dir_config('lonIDsDir');
61: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
62:
63: # ------------------------------------------- Transfer profile into environment
64:
65: my @profile;
66: {
67: my $idf=Apache::File->new("$lonidsdir/$handle.id");
68: flock($idf,LOCK_SH);
69: @profile=<$idf>;
70: $idf->close();
71: }
72: my $envi;
73: for ($envi=0;$envi<=$#profile;$envi++) {
74: chomp($profile[$envi]);
75: my ($envname,$envvalue)=split(/=/,$profile[$envi]);
76: $ENV{$envname} = $envvalue;
77: }
78: $ENV{'user.environment'} = "$lonidsdir/$handle.id";
79: if ($requrl=~/^\/res\//) {
80: $ENV{'request.state'} = "published";
81: } else {
82: $ENV{'request.state'} = 'unknown';
83: }
84: $ENV{'request.filename'} = $r->filename;
85:
86: # -------------------------------------------------------- Load POST parameters
87:
88:
89:
90: my $buffer;
91:
92: $r->read($buffer,$r->header_in('Content-length'));
93: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
94: my @pairs=split(/&/,$buffer);
95: my $pair;
96: foreach $pair (@pairs) {
97: my ($name,$value) = split(/=/,$pair);
98: $value =~ tr/+/ /;
99: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
100: $name =~ tr/+/ /;
101: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
102: &Apache::loncommon::add_to_env("form.$name",$value);
103: }
104: } else {
105: my $contentsep=$1;
106: my @lines = split (/\n/,$buffer);
107: my $name='';
108: my $value='';
109: my $fname='';
110: my $fmime='';
111: my $i;
112: for ($i=0;$i<=$#lines;$i++) {
113: if ($lines[$i]=~/^$contentsep/) {
114: if ($name) {
115: chomp($value);
116: if ($fname) {
117: $ENV{"form.$name.filename"}=$fname;
118: $ENV{"form.$name.mimetype"}=$fmime;
119: } else {
120: $value=~s/\s+$//s;
121: }
122: &Apache::loncommon::add_to_env("form.$name",$value);
123: }
124: if ($i<$#lines) {
125: $i++;
126: $lines[$i]=~
127: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
128: $name=$1;
129: $value='';
130: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
131: $fname=$1;
132: if
133: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
134: $fmime=$1;
135: $i++;
136: } else {
137: $fmime='';
138: }
139: } else {
140: $fname='';
141: $fmime='';
142: }
143: $i++;
144: }
145: } else {
146: $value.=$lines[$i]."\n";
147: }
148: }
149: }
150: $ENV{'request.method'}=$ENV{'REQUEST_METHOD'};
151: $r->method_number(M_GET);
152: $r->method('GET');
153: $r->headers_in->unset('Content-length');
154:
155: # ---------------------------------------------------------------- Check access
156:
157: if ($requrl!~/^\/adm|public|prtspool\//) {
158: my $access=&Apache::lonnet::allowed('bre',$requrl);
159: if ($access eq '1') {
160: $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
161: return HTTP_NOT_ACCEPTABLE;
162: }
163: if (($access ne '2') && ($access ne 'F')) {
164: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
165: return HTTP_NOT_ACCEPTABLE;
166: }
167: }
168: if ($requrl =~ m|^/prtspool/|) {
169: my $start='/prtspool/'.$ENV{'user.name'}.'_'.
170: $ENV{'user.domain'};
171: if ($requrl !~ /^\Q$start\E/) {
172: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
173: return HTTP_NOT_ACCEPTABLE;
174: }
175: }
176: # ------------------------------------------------------------- This is allowed
177: if ($ENV{'request.course.id'}) {
178: &Apache::lonnet::countacc($requrl);
179: $requrl=~/\.(\w+)$/;
180: if (&Apache::loncommon::fileembstyle($1) eq 'ssi') {
181: # ------------------------------------- This is serious stuff, get symb and log
182: my $query=$r->args;
183: my $symb;
184: if ($query) {
185: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
186: }
187: if ($ENV{'form.symb'}) {
188: $symb=&Apache::lonnet::symbclean($ENV{'form.symb'});
189: if (&Apache::lonnet::symbverify($symb,$requrl)) {
190: my ($map,$mid,$murl)=split(/\_\_\_/,$symb);
191: &Apache::lonnet::symblist($map,$murl => $mid,
192: 'last_known' => $murl);
193: } else {
194: $r->log_reason('Invalid symb for '.$requrl.': '.
195: $symb);
196: $ENV{'user.error.msg'}=
197: "$requrl:bre:1:1:Invalid Access";
198: return HTTP_NOT_ACCEPTABLE;
199: }
200: } else {
201: $symb=&Apache::lonnet::symbread;
202: }
203: $ENV{'request.symb'}=$symb;
204: &Apache::lonnet::courseacclog($symb);
205: } else {
206: # ------------------------------------------------------- This is other content
207: &Apache::lonnet::courseacclog($requrl);
208: }
209: }
210: return OK;
211: } else {
212: $r->log_reason("Cookie $handle not valid", $r->filename)
213: };
214: }
215:
216: # -------------------------------------------- See if this is a public resource
217: if ($requrl=~m|^/public/|
218: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
219: &Apache::lonnet::logthis('Granting public access: '.$requrl);
220: $ENV{'user.name'}='public';
221: $ENV{'user.domain'}='public';
222: $ENV{'request.state'} = "published";
223: $ENV{'request.publicaccess'} = 1;
224: $ENV{'request.filename'} = $r->filename;
225: return OK;
226: }
227: # -------------------------------------------------------------- Not authorized
228: $requrl=~/\.(\w+)$/;
229: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
230: ($requrl=~/^\/adm\/(roles|logout)/) ||
231: ($requrl=~m|^/prtspool/|)) {
232: # -------------------------- Store where they wanted to go and get login screen
233: $ENV{'request.firsturl'}=$requrl;
234: return FORBIDDEN;
235: } else {
236: # --------------------------------------------------------------------- Goodbye
237: return HTTP_BAD_REQUEST;
238: }
239: }
240:
241: 1;
242: __END__
243:
244: =head1 NAME
245:
246: Apache::lonacc - Cookie Based Access Handler
247:
248: =head1 SYNOPSIS
249:
250: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
251:
252: PerlAccessHandler Apache::lonacc
253:
254: =head1 INTRODUCTION
255:
256: This module enables cookie based authentication and is used
257: to control access for many different LON-CAPA URIs.
258:
259: Whenever the client sends the cookie back to the server,
260: this cookie is handled by either lonacc.pm or loncacc.pm
261: (see srm.conf for what is invoked when). If
262: the cookie is missing or invalid, the user is re-challenged
263: for login information.
264:
265: This is part of the LearningOnline Network with CAPA project
266: described at http://www.lon-capa.org.
267:
268: =head1 HANDLER SUBROUTINE
269:
270: This routine is called by Apache and mod_perl.
271:
272: =over 4
273:
274: =item *
275:
276: transfer profile into environment
277:
278: =item *
279:
280: load POST parameters
281:
282: =item *
283:
284: check access
285:
286: =item *
287:
288: if allowed, get symb, log, generate course statistics if applicable
289:
290: =item *
291:
292: otherwise return error
293:
294: =item *
295:
296: see if public resource
297:
298: =item *
299:
300: store attempted access
301:
302: =back
303:
304: =cut
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