1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.78 2006/06/02 19:38:21 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: ###############################################
55:
56: sub get_posted_cgi {
57: my ($r) = @_;
58:
59: my $buffer;
60: if ($r->header_in('Content-length')) {
61: $r->read($buffer,$r->header_in('Content-length'),0);
62: }
63: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
64: my @pairs=split(/&/,$buffer);
65: my $pair;
66: foreach $pair (@pairs) {
67: my ($name,$value) = split(/=/,$pair);
68: $value =~ tr/+/ /;
69: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
70: $name =~ tr/+/ /;
71: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
72: &Apache::loncommon::add_to_env("form.$name",$value);
73: }
74: } else {
75: my $contentsep=$1;
76: my @lines = split (/\n/,$buffer);
77: my $name='';
78: my $value='';
79: my $fname='';
80: my $fmime='';
81: my $i;
82: for ($i=0;$i<=$#lines;$i++) {
83: if ($lines[$i]=~/^$contentsep/) {
84: if ($name) {
85: chomp($value);
86: if ($fname) {
87: $env{"form.$name.filename"}=$fname;
88: $env{"form.$name.mimetype"}=$fmime;
89: } else {
90: $value=~s/\s+$//s;
91: }
92: &Apache::loncommon::add_to_env("form.$name",$value);
93: }
94: if ($i<$#lines) {
95: $i++;
96: $lines[$i]=~
97: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
98: $name=$1;
99: $value='';
100: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
101: $fname=$1;
102: if
103: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
104: $fmime=$1;
105: $i++;
106: } else {
107: $fmime='';
108: }
109: } else {
110: $fname='';
111: $fmime='';
112: }
113: $i++;
114: }
115: } else {
116: $value.=$lines[$i]."\n";
117: }
118: }
119: }
120: #
121: # Digested POSTed values
122: #
123: # Remember the way this was originally done (GET or POST)
124: #
125: $env{'request.method'}=$ENV{'REQUEST_METHOD'};
126: #
127: # There may also be stuff in the query string
128: # Tell subsequent handlers that this was GET, not POST, so they can access query string.
129: # Also, unset POSTed content length to cover all tracks.
130: #
131:
132: $r->method_number(M_GET);
133:
134: $r->method('GET');
135: $r->headers_in->unset('Content-length');
136: }
137:
138:
139: sub handler {
140: my $r = shift;
141: my $requrl=$r->uri;
142: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
143: my $lonid=$cookies{'lonID'};
144: my $cookie;
145: my $lonidsdir=$r->dir_config('lonIDsDir');
146:
147: my $handle;
148: if ($lonid) {
149: $handle=$lonid->value;
150: $handle=~s/\W//g;
151: }
152:
153: my ($sso_login);
154: if ($r->user
155: && (!$lonid || !-e "$lonidsdir/$handle.id" || $handle eq '') ) {
156: $sso_login = 1;
157: my $domain = $r->dir_config('lonDefDomain');
158: my $home=&Apache::lonnet::homeserver($r->user,$domain);
159: if ($home !~ /(con_lost|no_such_host)/) {
160: $handle=&Apache::lonauth::success($r,$r->user,$domain,
161: $home,'noredirect');
162: $r->header_out('Set-cookie',"lonID=$handle; path=/");
163: }
164: }
165:
166: if ($sso_login) {
167: &Apache::lonnet::appenv('request.sso.login' => 1);
168: }
169:
170: if ($r->dir_config("lonBalancer") eq 'yes') {
171: $r->set_handlers('PerlResponseHandler'=>
172: [\&Apache::switchserver::handler]);
173: }
174:
175: if ($handle ne '') {
176: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
177:
178: # ------------------------------------------------------ Initialize Environment
179:
180: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
181:
182: # --------------------------------------------------------- Initialize Language
183:
184: &Apache::lonlocal::get_language_handle($r);
185:
186: # -------------------------------------------------------------- Resource State
187:
188: if ($requrl=~/^\/+(res|uploaded)\//) {
189: $env{'request.state'} = "published";
190: } else {
191: $env{'request.state'} = 'unknown';
192: }
193: $env{'request.filename'} = $r->filename;
194: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
195: # -------------------------------------------------------- Load POST parameters
196:
197: &Apache::lonacc::get_posted_cgi($r);
198:
199: # ---------------------------------------------------------------- Check access
200:
201: if ($requrl!~/^\/adm|public|prtspool\//) {
202: my $access=&Apache::lonnet::allowed('bre',$requrl);
203: if ($access eq '1') {
204: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
205: return HTTP_NOT_ACCEPTABLE;
206: }
207: if (($access ne '2') && ($access ne 'F')) {
208: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
209: return HTTP_NOT_ACCEPTABLE;
210: }
211: }
212: if ($requrl =~ m|^/prtspool/|) {
213: my $start='/prtspool/'.$env{'user.name'}.'_'.
214: $env{'user.domain'};
215: if ($requrl !~ /^\Q$start\E/) {
216: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
217: return HTTP_NOT_ACCEPTABLE;
218: }
219: }
220: if ($env{'user.name'} eq 'public' &&
221: $env{'user.domain'} eq 'public' &&
222: $requrl !~ m{^/+(res|public)/} &&
223: $requrl !~ m{^/+adm/(help|logout|randomlabel\.png)}) {
224: $env{'request.querystring'}=$r->args;
225: $env{'request.firsturl'}=$requrl;
226: return FORBIDDEN;
227: }
228: # ------------------------------------------------------------- This is allowed
229: if ($env{'request.course.id'}) {
230: &Apache::lonnet::countacc($requrl);
231: $requrl=~/\.(\w+)$/;
232: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
233: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$)/) ||
234: ($requrl=~/^\/adm\/wrapper\//) ||
235: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
236: ($requrl=~m|\.problem/smpedit$|) ||
237: ($requrl=~/^\/public\/.*\/syllabus$/)) {
238: # ------------------------------------- This is serious stuff, get symb and log
239: my $query=$r->args;
240: my $symb;
241: if ($query) {
242: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
243: }
244: if ($env{'form.symb'}) {
245: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
246: if ($requrl =~ m|^/adm/wrapper/|
247: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
248: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
249: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
250: 'last_known' =>[$murl,$mid]);
251: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
252: (($requrl=~m|(.*)/smpedit$|) &&
253: &Apache::lonnet::symbverify($symb,$1))) {
254: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
255: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
256: 'last_known' =>[$murl,$mid]);
257: } else {
258: $r->log_reason('Invalid symb for '.$requrl.': '.
259: $symb);
260: $env{'user.error.msg'}=
261: "$requrl:bre:1:1:Invalid Access";
262: return HTTP_NOT_ACCEPTABLE;
263: }
264: } else {
265: $symb=&Apache::lonnet::symbread($requrl);
266: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
267: !&Apache::lonnet::symbverify($symb,$requrl)) {
268: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
269: $env{'user.error.msg'}=
270: "$requrl:bre:1:1:Invalid Access";
271: return HTTP_NOT_ACCEPTABLE;
272: }
273: if ($symb) {
274: my ($map,$mid,$murl)=
275: &Apache::lonnet::decode_symb($symb);
276: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
277: 'last_known' =>[$murl,$mid]);
278: }
279: }
280: $env{'request.symb'}=$symb;
281: &Apache::lonnet::courseacclog($symb);
282: } else {
283: # ------------------------------------------------------- This is other content
284: &Apache::lonnet::courseacclog($requrl);
285: }
286: }
287: return OK;
288: } else {
289: $r->log_reason("Cookie $handle not valid", $r->filename);
290: }
291: }
292:
293: # -------------------------------------------- See if this is a public resource
294: if ($requrl=~m|^/public/|
295: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
296: &Apache::lonnet::logthis('Granting public access: '.$requrl);
297: &Apache::lonlocal::get_language_handle($r);
298: my $cookie=
299: &Apache::lonauth::success($r,'public','public','public');
300: my $lonidsdir=$r->dir_config('lonIDsDir');
301: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$cookie);
302: &Apache::lonacc::get_posted_cgi($r);
303: $env{'request.state'} = "published";
304: $env{'request.publicaccess'} = 1;
305: $env{'request.filename'} = $r->filename;
306:
307: $r->header_out('Set-cookie',"lonID=$cookie; path=/");
308: return OK;
309: }
310: if ($requrl=~m|^/+adm/+help/+|) {
311: return OK;
312: }
313: # -------------------------------------------------------------- Not authorized
314: $requrl=~/\.(\w+)$/;
315: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
316: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
317: # ($requrl=~m|^/prtspool/|)) {
318: # -------------------------- Store where they wanted to go and get login screen
319: $env{'request.querystring'}=$r->args;
320: $env{'request.firsturl'}=$requrl;
321: return FORBIDDEN;
322: # } else {
323: # --------------------------------------------------------------------- Goodbye
324: # return HTTP_BAD_REQUEST;
325: # }
326: }
327:
328: 1;
329: __END__
330:
331: =head1 NAME
332:
333: Apache::lonacc - Cookie Based Access Handler
334:
335: =head1 SYNOPSIS
336:
337: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
338:
339: PerlAccessHandler Apache::lonacc
340:
341: =head1 INTRODUCTION
342:
343: This module enables cookie based authentication and is used
344: to control access for many different LON-CAPA URIs.
345:
346: Whenever the client sends the cookie back to the server,
347: this cookie is handled by either lonacc.pm or loncacc.pm
348: (see srm.conf for what is invoked when). If
349: the cookie is missing or invalid, the user is re-challenged
350: for login information.
351:
352: This is part of the LearningOnline Network with CAPA project
353: described at http://www.lon-capa.org.
354:
355: =head1 HANDLER SUBROUTINE
356:
357: This routine is called by Apache and mod_perl.
358:
359: =over 4
360:
361: =item *
362:
363: transfer profile into environment
364:
365: =item *
366:
367: load POST parameters
368:
369: =item *
370:
371: check access
372:
373: =item *
374:
375: if allowed, get symb, log, generate course statistics if applicable
376:
377: =item *
378:
379: otherwise return error
380:
381: =item *
382:
383: see if public resource
384:
385: =item *
386:
387: store attempted access
388:
389: =back
390:
391: =cut
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