1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.89 2006/07/21 18:52:32 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 Apache::restrictedaccess();
39: use CGI::Cookie();
40: use Fcntl qw(:flock);
41: use LONCAPA;
42:
43: sub cleanup {
44: my ($r)=@_;
45: if (! $r->is_initial_req()) { return DECLINED; }
46: &Apache::lonnet::save_cache();
47: return OK;
48: }
49:
50: sub goodbye {
51: my ($r)=@_;
52: &Apache::lonnet::goodbye();
53: return DONE;
54: }
55:
56: ###############################################
57:
58: sub get_posted_cgi {
59: my ($r) = @_;
60:
61: my $buffer;
62: if ($r->header_in('Content-length')) {
63: $r->read($buffer,$r->header_in('Content-length'),0);
64: }
65: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
66: my @pairs=split(/&/,$buffer);
67: my $pair;
68: foreach $pair (@pairs) {
69: my ($name,$value) = split(/=/,$pair);
70: $value =~ tr/+/ /;
71: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
72: $name =~ tr/+/ /;
73: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
74: &Apache::loncommon::add_to_env("form.$name",$value);
75: }
76: } else {
77: my $contentsep=$1;
78: my @lines = split (/\n/,$buffer);
79: my $name='';
80: my $value='';
81: my $fname='';
82: my $fmime='';
83: my $i;
84: for ($i=0;$i<=$#lines;$i++) {
85: if ($lines[$i]=~/^$contentsep/) {
86: if ($name) {
87: chomp($value);
88: if ($fname) {
89: $env{"form.$name.filename"}=$fname;
90: $env{"form.$name.mimetype"}=$fmime;
91: } else {
92: $value=~s/\s+$//s;
93: }
94: &Apache::loncommon::add_to_env("form.$name",$value);
95: }
96: if ($i<$#lines) {
97: $i++;
98: $lines[$i]=~
99: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
100: $name=$1;
101: $value='';
102: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
103: $fname=$1;
104: if
105: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
106: $fmime=$1;
107: $i++;
108: } else {
109: $fmime='';
110: }
111: } else {
112: $fname='';
113: $fmime='';
114: }
115: $i++;
116: }
117: } else {
118: $value.=$lines[$i]."\n";
119: }
120: }
121: }
122: #
123: # Digested POSTed values
124: #
125: # Remember the way this was originally done (GET or POST)
126: #
127: $env{'request.method'}=$ENV{'REQUEST_METHOD'};
128: #
129: # There may also be stuff in the query string
130: # Tell subsequent handlers that this was GET, not POST, so they can access query string.
131: # Also, unset POSTed content length to cover all tracks.
132: #
133:
134: $r->method_number(M_GET);
135:
136: $r->method('GET');
137: $r->headers_in->unset('Content-length');
138: }
139:
140: sub passphrase_access_checker {
141: my ($r,$guestkey,$requrl) = @_;
142: my ($num,$scope,$end,$start) = ($guestkey =~ /^([^:]+):([a-z]+)_(\d*)_?(\d*)$/);
143: if ($scope eq 'guest') {
144: if (exists($env{'user.passphrase_access_'.$requrl})) {
145: if (($env{'user.passphrase_access_'.$requrl} == 0) ||
146: ($env{'user.passphrase_access_'.$requrl} > time)) {
147: $env{'request.publicaccess'} = 1;
148: return 'ok';
149: }
150: }
151: }
152: $r->set_handlers('PerlHandler'=> \&Apache::restrictedaccess::handler);
153: $r->content_type('perl-script');
154: return;
155: }
156:
157: sub handler {
158: my $r = shift;
159: my $requrl=$r->uri;
160: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
161: my $lonid=$cookies{'lonID'};
162: my $cookie;
163: my $lonidsdir=$r->dir_config('lonIDsDir');
164:
165: my $handle;
166: if ($lonid) {
167: $handle=$lonid->value;
168: $handle=~s/\W//g;
169: }
170:
171: my ($sso_login);
172: if ($r->user
173: && (!$lonid || !-e "$lonidsdir/$handle.id" || $handle eq '') ) {
174: $sso_login = 1;
175: my $domain = $r->dir_config('lonDefDomain');
176: my $home=&Apache::lonnet::homeserver($r->user,$domain);
177: if ($home !~ /(con_lost|no_such_host)/) {
178: $handle=&Apache::lonauth::success($r,$r->user,$domain,
179: $home,'noredirect');
180: $r->header_out('Set-cookie',"lonID=$handle; path=/");
181: }
182: }
183:
184: if ($sso_login) {
185: &Apache::lonnet::appenv('request.sso.login' => 1);
186: }
187:
188: if ($r->dir_config("lonBalancer") eq 'yes') {
189: $r->set_handlers('PerlResponseHandler'=>
190: [\&Apache::switchserver::handler]);
191: }
192:
193: if ($handle ne '') {
194: if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
195:
196: # ------------------------------------------------------ Initialize Environment
197:
198: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
199:
200: # --------------------------------------------------------- Initialize Language
201:
202: &Apache::lonlocal::get_language_handle($r);
203:
204: # -------------------------------------------------------------- Resource State
205:
206: if ($requrl=~/^\/+(res|uploaded)\//) {
207: $env{'request.state'} = "published";
208: } else {
209: $env{'request.state'} = 'unknown';
210: }
211: $env{'request.filename'} = $r->filename;
212: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
213: # -------------------------------------------------------- Load POST parameters
214:
215: &Apache::lonacc::get_posted_cgi($r);
216:
217: # ---------------------------------------------------------------- Check access
218: my $now = time;
219: if (&Apache::lonnet::is_portfolio_url($requrl)) {
220: my $result = &Apache::lonnet::portfolio_access($r,$requrl);
221: if ($result eq 'ok') { return OK; }
222: }
223: if ($requrl!~/^\/adm|public|prtspool\//) {
224: my $access=&Apache::lonnet::allowed('bre',$requrl);
225: if ($access eq '1') {
226: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
227: return HTTP_NOT_ACCEPTABLE;
228: }
229: if (($access ne '2') && ($access ne 'F')) {
230: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
231: return HTTP_NOT_ACCEPTABLE;
232: }
233: }
234: if ($requrl =~ m|^/prtspool/|) {
235: my $start='/prtspool/'.$env{'user.name'}.'_'.
236: $env{'user.domain'};
237: if ($requrl !~ /^\Q$start\E/) {
238: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
239: return HTTP_NOT_ACCEPTABLE;
240: }
241: }
242: if ($env{'user.name'} eq 'public' &&
243: $env{'user.domain'} eq 'public' &&
244: $requrl !~ m{^/+(res|public)/} &&
245: $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
246: $env{'request.querystring'}=$r->args;
247: $env{'request.firsturl'}=$requrl;
248: return FORBIDDEN;
249: }
250: # ------------------------------------------------------------- This is allowed
251: if ($env{'request.course.id'}) {
252: &Apache::lonnet::countacc($requrl);
253: $requrl=~/\.(\w+)$/;
254: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
255: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$)/) ||
256: ($requrl=~/^\/adm\/wrapper\//) ||
257: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
258: ($requrl=~m|\.problem/smpedit$|) ||
259: ($requrl=~/^\/public\/.*\/syllabus$/)) {
260: # ------------------------------------- This is serious stuff, get symb and log
261: my $query=$r->args;
262: my $symb;
263: if ($query) {
264: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
265: }
266: if ($env{'form.symb'}) {
267: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
268: if ($requrl =~ m|^/adm/wrapper/|
269: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
270: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
271: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
272: 'last_known' =>[$murl,$mid]);
273: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
274: (($requrl=~m|(.*)/smpedit$|) &&
275: &Apache::lonnet::symbverify($symb,$1))) {
276: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
277: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
278: 'last_known' =>[$murl,$mid]);
279: } else {
280: $r->log_reason('Invalid symb for '.$requrl.': '.
281: $symb);
282: $env{'user.error.msg'}=
283: "$requrl:bre:1:1:Invalid Access";
284: return HTTP_NOT_ACCEPTABLE;
285: }
286: } else {
287: $symb=&Apache::lonnet::symbread($requrl);
288: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
289: !&Apache::lonnet::symbverify($symb,$requrl)) {
290: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
291: $env{'user.error.msg'}=
292: "$requrl:bre:1:1:Invalid Access";
293: return HTTP_NOT_ACCEPTABLE;
294: }
295: if ($symb) {
296: my ($map,$mid,$murl)=
297: &Apache::lonnet::decode_symb($symb);
298: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
299: 'last_known' =>[$murl,$mid]);
300: }
301: }
302: $env{'request.symb'}=$symb;
303: &Apache::lonnet::courseacclog($symb);
304: } else {
305: # ------------------------------------------------------- This is other content
306: &Apache::lonnet::courseacclog($requrl);
307: }
308: }
309: return OK;
310: } else {
311: $r->log_reason("Cookie $handle not valid", $r->filename);
312: }
313: }
314:
315: # -------------------------------------------- See if this is a public resource
316: if ($requrl=~m|^/public/|
317: || (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
318: &Apache::lonnet::logthis('Granting public access: '.$requrl);
319: &Apache::lonlocal::get_language_handle($r);
320: my $cookie=
321: &Apache::lonauth::success($r,'public','public','public');
322: my $lonidsdir=$r->dir_config('lonIDsDir');
323: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$cookie);
324: &Apache::lonacc::get_posted_cgi($r);
325: $env{'request.state'} = "published";
326: $env{'request.publicaccess'} = 1;
327: $env{'request.filename'} = $r->filename;
328:
329: $r->header_out('Set-cookie',"lonID=$cookie; path=/");
330: return OK;
331: }
332: if ($requrl=~m|^/+adm/+help/+|) {
333: return OK;
334: }
335: # ------------------------------------- See if this is a viewable portfolio file
336: if (&Apache::lonnet::is_portfolio_url($requrl)) {
337: my $result = &Apache::lonnet::portfolio_access($r,$requrl);
338: if ($result eq 'ok' ) { return OK; }
339: }
340:
341: # -------------------------------------------------------------- Not authorized
342: $requrl=~/\.(\w+)$/;
343: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
344: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
345: # ($requrl=~m|^/prtspool/|)) {
346: # -------------------------- Store where they wanted to go and get login screen
347: $env{'request.querystring'}=$r->args;
348: $env{'request.firsturl'}=$requrl;
349: return FORBIDDEN;
350: # } else {
351: # --------------------------------------------------------------------- Goodbye
352: # return HTTP_BAD_REQUEST;
353: # }
354: }
355:
356: 1;
357: __END__
358:
359: =head1 NAME
360:
361: Apache::lonacc - Cookie Based Access Handler
362:
363: =head1 SYNOPSIS
364:
365: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
366:
367: PerlAccessHandler Apache::lonacc
368:
369: =head1 INTRODUCTION
370:
371: This module enables cookie based authentication and is used
372: to control access for many different LON-CAPA URIs.
373:
374: Whenever the client sends the cookie back to the server,
375: this cookie is handled by either lonacc.pm or loncacc.pm
376: (see srm.conf for what is invoked when). If
377: the cookie is missing or invalid, the user is re-challenged
378: for login information.
379:
380: This is part of the LearningOnline Network with CAPA project
381: described at http://www.lon-capa.org.
382:
383: =head1 HANDLER SUBROUTINE
384:
385: This routine is called by Apache and mod_perl.
386:
387: =over 4
388:
389: =item *
390:
391: transfer profile into environment
392:
393: =item *
394:
395: load POST parameters
396:
397: =item *
398:
399: check access
400:
401: =item *
402:
403: if allowed, get symb, log, generate course statistics if applicable
404:
405: =item *
406:
407: otherwise return error
408:
409: =item *
410:
411: see if public resource
412:
413: =item *
414:
415: store attempted access
416:
417: =back
418:
419: =cut
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