1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.40 2003/04/02 14:57:32 www 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: # YEAR=2002
36: # 1/4,2/25 Gerd Kortemeyer
37: #
38: ###
39:
40: package Apache::lonacc;
41:
42: use strict;
43: use Apache::Constants qw(:common :http :methods);
44: use Apache::File;
45: use Apache::lonnet;
46: use Apache::loncommon();
47: use CGI::Cookie();
48: use Fcntl qw(:flock);
49:
50: sub handler {
51: my $r = shift;
52: my $requrl=$r->uri;
53: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
54: my $lonid=$cookies{'lonID'};
55: my $cookie;
56: if ($lonid) {
57: my $handle=$lonid->value;
58: $handle=~s/\W//g;
59: my $lonidsdir=$r->dir_config('lonIDsDir');
60: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
61:
62: # ------------------------------------------- Transfer profile into environment
63:
64: my @profile;
65: {
66: my $idf=Apache::File->new("$lonidsdir/$handle.id");
67: flock($idf,LOCK_SH);
68: @profile=<$idf>;
69: $idf->close();
70: }
71: my $envi;
72: for ($envi=0;$envi<=$#profile;$envi++) {
73: chomp($profile[$envi]);
74: my ($envname,$envvalue)=split(/=/,$profile[$envi]);
75: $ENV{$envname} = $envvalue;
76: }
77: $ENV{'user.environment'} = "$lonidsdir/$handle.id";
78: if ($requrl=~/^\/res\//) {
79: $ENV{'request.state'} = "published";
80: } else {
81: $ENV{'request.state'} = 'unknown';
82: }
83: $ENV{'request.filename'} = $r->filename;
84:
85: # -------------------------------------------------------- Load POST parameters
86:
87:
88:
89: my $buffer;
90:
91: $r->read($buffer,$r->header_in('Content-length'));
92: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
93: my @pairs=split(/&/,$buffer);
94: my $pair;
95: foreach $pair (@pairs) {
96: my ($name,$value) = split(/=/,$pair);
97: $value =~ tr/+/ /;
98: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
99: $name =~ tr/+/ /;
100: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
101: &Apache::loncommon::add_to_env("form.$name",$value);
102: }
103: } else {
104: my $contentsep=$1;
105: my @lines = split (/\n/,$buffer);
106: my $name='';
107: my $value='';
108: my $fname='';
109: my $fmime='';
110: my $i;
111: for ($i=0;$i<=$#lines;$i++) {
112: if ($lines[$i]=~/^$contentsep/) {
113: if ($name) {
114: chomp($value);
115: if ($fname) {
116: $ENV{"form.$name.filename"}=$fname;
117: $ENV{"form.$name.mimetype"}=$fmime;
118: } else {
119: $value=~s/\s+$//s;
120: }
121: &Apache::loncommon::add_to_env("form.$name",$value);
122: }
123: if ($i<$#lines) {
124: $i++;
125: $lines[$i]=~
126: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
127: $name=$1;
128: $value='';
129: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
130: $fname=$1;
131: if
132: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
133: $fmime=$1;
134: $i++;
135: } else {
136: $fmime='';
137: }
138: } else {
139: $fname='';
140: $fmime='';
141: }
142: $i++;
143: }
144: } else {
145: $value.=$lines[$i]."\n";
146: }
147: }
148: }
149: $ENV{'request.method'}=$ENV{'REQUEST_METHOD'};
150: $r->method_number(M_GET);
151: $r->method('GET');
152: $r->headers_in->unset('Content-length');
153:
154: # ---------------------------------------------------------------- Check access
155:
156: if ($requrl!~/^\/adm|public|prtspool\//) {
157: my $access=&Apache::lonnet::allowed('bre',$requrl);
158: if ($access eq '1') {
159: $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
160: return HTTP_NOT_ACCEPTABLE;
161: }
162: if (($access ne '2') && ($access ne 'F')) {
163: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
164: return HTTP_NOT_ACCEPTABLE;
165: }
166: }
167: if ($requrl =~ m|^/prtspool/|) {
168: my $start='/prtspool/'.$ENV{'user.name'}.'_'.
169: $ENV{'user.domain'};
170: if ($requrl !~ /^\Q$start\E/) {
171: $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
172: return HTTP_NOT_ACCEPTABLE;
173: }
174: }
175: # ------------------------------------------------------------- This is allowed
176: if ($ENV{'request.course.id'}) {
177: &Apache::lonnet::countacc($requrl);
178: $requrl=~/\.(\w+)$/;
179: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
180: ($requrl=~/^\/adm\/(aboutme|navmaps|smppg|bulletinboard|wrapper)/) ||
181: ($requrl=~/^\/public\/.*\/syllabus$/)) {
182: # ------------------------------------- This is serious stuff, get symb and log
183: my $query=$r->args;
184: my $symb;
185: if ($query) {
186: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
187: }
188: if ($ENV{'form.symb'}) {
189: $symb=&Apache::lonnet::symbclean($ENV{'form.symb'});
190: if (&Apache::lonnet::symbverify($symb,$requrl)) {
191: my ($map,$mid,$murl)=split(/\_\_\_/,$symb);
192: &Apache::lonnet::symblist($map,$murl => $mid,
193: 'last_known' => $murl);
194: } else {
195: $r->log_reason('Invalid symb for '.$requrl.': '.
196: $symb);
197: $ENV{'user.error.msg'}=
198: "$requrl:bre:1:1:Invalid Access";
199: return HTTP_NOT_ACCEPTABLE;
200: }
201: } else {
202: $symb=&Apache::lonnet::symbread;
203: }
204: $ENV{'request.symb'}=$symb;
205: &Apache::lonnet::courseacclog($symb);
206: } else {
207: # ------------------------------------------------------- This is other content
208: &Apache::lonnet::courseacclog($requrl);
209: }
210: }
211: return OK;
212: } else {
213: $r->log_reason("Cookie $handle not valid", $r->filename)
214: };
215: }
216:
217: # -------------------------------------------- See if this is a public resource
218: if ($requrl=~m|^/public/|
219: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
220: &Apache::lonnet::logthis('Granting public access: '.$requrl);
221: $ENV{'user.name'}='public';
222: $ENV{'user.domain'}='public';
223: $ENV{'request.state'} = "published";
224: $ENV{'request.publicaccess'} = 1;
225: $ENV{'request.filename'} = $r->filename;
226: return OK;
227: }
228: # -------------------------------------------------------------- Not authorized
229: $requrl=~/\.(\w+)$/;
230: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
231: ($requrl=~/^\/adm\/(roles|logout|email)/) ||
232: ($requrl=~m|^/prtspool/|)) {
233: # -------------------------- Store where they wanted to go and get login screen
234: $ENV{'request.querystring'}=$r->args;
235: $ENV{'request.firsturl'}=$requrl;
236: return FORBIDDEN;
237: } else {
238: # --------------------------------------------------------------------- Goodbye
239: return HTTP_BAD_REQUEST;
240: }
241: }
242:
243: 1;
244: __END__
245:
246: =head1 NAME
247:
248: Apache::lonacc - Cookie Based Access Handler
249:
250: =head1 SYNOPSIS
251:
252: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
253:
254: PerlAccessHandler Apache::lonacc
255:
256: =head1 INTRODUCTION
257:
258: This module enables cookie based authentication and is used
259: to control access for many different LON-CAPA URIs.
260:
261: Whenever the client sends the cookie back to the server,
262: this cookie is handled by either lonacc.pm or loncacc.pm
263: (see srm.conf for what is invoked when). If
264: the cookie is missing or invalid, the user is re-challenged
265: for login information.
266:
267: This is part of the LearningOnline Network with CAPA project
268: described at http://www.lon-capa.org.
269:
270: =head1 HANDLER SUBROUTINE
271:
272: This routine is called by Apache and mod_perl.
273:
274: =over 4
275:
276: =item *
277:
278: transfer profile into environment
279:
280: =item *
281:
282: load POST parameters
283:
284: =item *
285:
286: check access
287:
288: =item *
289:
290: if allowed, get symb, log, generate course statistics if applicable
291:
292: =item *
293:
294: otherwise return error
295:
296: =item *
297:
298: see if public resource
299:
300: =item *
301:
302: store attempted access
303:
304: =back
305:
306: =cut
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