1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.95 2006/08/30 21:48:51 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: # handle the case of the single sign on user, at this point $r->user
141: # will be set and valid now need to find the loncapa user info and possibly
142: # balance them
143: # returns OK if it was a SSO and user was handled
144: # undef if not SSO or no means to hanle the user
145: sub sso_login {
146: my ($r,$lonid,$handle) = @_;
147:
148: my $lonidsdir=$r->dir_config('lonIDsDir');
149: if (!($r->user
150: && (!defined($env{'user.name'}) && !defined($env{'user.domain'}))
151: && (!$lonid || !-e "$lonidsdir/$handle.id" || $handle eq ''))) {
152: # not an SSO case or already logged in
153: return undef;
154: }
155:
156: my $domain = $r->dir_config('lonDefDomain');
157: my $home=&Apache::lonnet::homeserver($r->user,$domain);
158: if ($home !~ /(con_lost|no_host|no_such_host)/) {
159: if ($r->dir_config("lonBalancer") eq 'yes') {
160: # login but immeaditly go to switch server to find us a new
161: # machine
162: &Apache::lonauth::success($r,$r->user,$domain,$home,'noredirect');
163: $r->internal_redirect('/adm/switchserver');
164: } else {
165: # need to login them in, so generate the need data that
166: # migrate expects to do login
167: my %info=('ip' => $r->connection->remote_ip(),
168: 'domain' => $domain,
169: 'username' => $r->user,
170: 'server' => $r->dir_config('lonHostID'),
171: 'sso.login' => 1
172: );
173: my $token =
174: &Apache::lonnet::tmpput(\%info,
175: $r->dir_config('lonHostID'));
176: $env{'form.token'} = $token;
177: $r->internal_redirect('/adm/migrateuser');
178: }
179: return OK;
180: } elsif (defined($r->dir_config('lonSSOUserUnkownRedirect'))) {
181: $r->internal_redirect($r->dir_config('lonSSOUserUnkownRedirect'));
182: return OK;
183: }
184: return undef;
185: }
186:
187: sub handler {
188: my $r = shift;
189: my $requrl=$r->uri;
190: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
191: my $lonid=$cookies{'lonID'};
192: my $cookie;
193: my $lonidsdir=$r->dir_config('lonIDsDir');
194:
195: my $handle;
196: if ($lonid) {
197: $handle=$lonid->value;
198: $handle=~s/\W//g;
199: }
200:
201: if (my $result = &sso_login($r,$lonid,$handle)) {
202: return $result
203: }
204:
205:
206: if ($r->dir_config("lonBalancer") eq 'yes') {
207: $r->set_handlers('PerlResponseHandler'=>
208: [\&Apache::switchserver::handler]);
209: }
210:
211: if ($handle eq '') {
212: $r->log_reason("Cookie $handle not valid", $r->filename);
213: } elsif ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
214:
215: # ------------------------------------------------------ Initialize Environment
216:
217: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
218:
219: # --------------------------------------------------------- Initialize Language
220:
221: &Apache::lonlocal::get_language_handle($r);
222:
223: }
224:
225: # -------------------------------------------------- Should be a valid user now
226: if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') {
227: # -------------------------------------------------------------- Resource State
228:
229: if ($requrl=~/^\/+(res|uploaded)\//) {
230: $env{'request.state'} = "published";
231: } else {
232: $env{'request.state'} = 'unknown';
233: }
234: $env{'request.filename'} = $r->filename;
235: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
236: # -------------------------------------------------------- Load POST parameters
237:
238: &Apache::lonacc::get_posted_cgi($r);
239:
240: # ---------------------------------------------------------------- Check access
241: my $now = time;
242: if ($requrl !~ m{^/(?:adm|public|prtspool)/}
243: || $requrl =~ /^\/adm\/.*\/(smppg|bulletinboard)(\?|$ )/x) {
244: my $access=&Apache::lonnet::allowed('bre',$requrl);
245: if ($access eq '1') {
246: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
247: return HTTP_NOT_ACCEPTABLE;
248: }
249: if ($access eq 'A') {
250: &Apache::restrictedaccess::setup_handler($r);
251: return OK;
252: }
253: if (($access ne '2') && ($access ne 'F')) {
254: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
255: return HTTP_NOT_ACCEPTABLE;
256: }
257: }
258: if ($requrl =~ m|^/prtspool/|) {
259: my $start='/prtspool/'.$env{'user.name'}.'_'.
260: $env{'user.domain'};
261: if ($requrl !~ /^\Q$start\E/) {
262: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
263: return HTTP_NOT_ACCEPTABLE;
264: }
265: }
266: if ($env{'user.name'} eq 'public' &&
267: $env{'user.domain'} eq 'public' &&
268: $requrl !~ m{^/+(res|public|uploaded)/} &&
269: $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
270: $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
271: $env{'request.querystring'}=$r->args;
272: $env{'request.firsturl'}=$requrl;
273: return FORBIDDEN;
274: }
275: # ------------------------------------------------------------- This is allowed
276: if ($env{'request.course.id'}) {
277: &Apache::lonnet::countacc($requrl);
278: $requrl=~/\.(\w+)$/;
279: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
280: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$ )/x) ||
281: ($requrl=~/^\/adm\/wrapper\//) ||
282: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
283: ($requrl=~m|\.problem/smpedit$|) ||
284: ($requrl=~/^\/public\/.*\/syllabus$/)) {
285: # ------------------------------------- This is serious stuff, get symb and log
286: my $query=$r->args;
287: my $symb;
288: if ($query) {
289: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
290: }
291: if ($env{'form.symb'}) {
292: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
293: if ($requrl =~ m|^/adm/wrapper/|
294: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
295: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
296: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
297: 'last_known' =>[$murl,$mid]);
298: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
299: (($requrl=~m|(.*)/smpedit$|) &&
300: &Apache::lonnet::symbverify($symb,$1))) {
301: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
302: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
303: 'last_known' =>[$murl,$mid]);
304: } else {
305: $r->log_reason('Invalid symb for '.$requrl.': '.
306: $symb);
307: $env{'user.error.msg'}=
308: "$requrl:bre:1:1:Invalid Access";
309: return HTTP_NOT_ACCEPTABLE;
310: }
311: } else {
312: $symb=&Apache::lonnet::symbread($requrl);
313: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
314: !&Apache::lonnet::symbverify($symb,$requrl)) {
315: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
316: $env{'user.error.msg'}=
317: "$requrl:bre:1:1:Invalid Access";
318: return HTTP_NOT_ACCEPTABLE;
319: }
320: if ($symb) {
321: my ($map,$mid,$murl)=
322: &Apache::lonnet::decode_symb($symb);
323: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
324: 'last_known' =>[$murl,$mid]);
325: }
326: }
327: $env{'request.symb'}=$symb;
328: &Apache::lonnet::courseacclog($symb);
329: } else {
330: # ------------------------------------------------------- This is other content
331: &Apache::lonnet::courseacclog($requrl);
332: }
333: }
334: return OK;
335: }
336: # -------------------------------------------- See if this is a public resource
337: if ($requrl=~m|^/+adm/+help/+|) {
338: return OK;
339: }
340: # ------------------------------------ See if this is a viewable portfolio file
341: if (&Apache::lonnet::is_portfolio_url($requrl)) {
342: my $access=&Apache::lonnet::allowed('bre',$requrl);
343: if ($access eq 'A') {
344: &Apache::restrictedaccess::setup_handler($r);
345: return OK;
346: }
347: if (($access ne '2') && ($access ne 'F')) {
348: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
349: return HTTP_NOT_ACCEPTABLE;
350: }
351: }
352:
353: # -------------------------------------------------------------- Not authorized
354: $requrl=~/\.(\w+)$/;
355: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
356: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
357: # ($requrl=~m|^/prtspool/|)) {
358: # -------------------------- Store where they wanted to go and get login screen
359: $env{'request.querystring'}=$r->args;
360: $env{'request.firsturl'}=$requrl;
361: return FORBIDDEN;
362: # } else {
363: # --------------------------------------------------------------------- Goodbye
364: # return HTTP_BAD_REQUEST;
365: # }
366: }
367:
368: 1;
369: __END__
370:
371: =head1 NAME
372:
373: Apache::lonacc - Cookie Based Access Handler
374:
375: =head1 SYNOPSIS
376:
377: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
378:
379: PerlAccessHandler Apache::lonacc
380:
381: =head1 INTRODUCTION
382:
383: This module enables cookie based authentication and is used
384: to control access for many different LON-CAPA URIs.
385:
386: Whenever the client sends the cookie back to the server,
387: this cookie is handled by either lonacc.pm or loncacc.pm
388: (see srm.conf for what is invoked when). If
389: the cookie is missing or invalid, the user is re-challenged
390: for login information.
391:
392: This is part of the LearningOnline Network with CAPA project
393: described at http://www.lon-capa.org.
394:
395: =head1 HANDLER SUBROUTINE
396:
397: This routine is called by Apache and mod_perl.
398:
399: =over 4
400:
401: =item *
402:
403: transfer profile into environment
404:
405: =item *
406:
407: load POST parameters
408:
409: =item *
410:
411: check access
412:
413: =item *
414:
415: if allowed, get symb, log, generate course statistics if applicable
416:
417: =item *
418:
419: otherwise return error
420:
421: =item *
422:
423: see if public resource
424:
425: =item *
426:
427: store attempted access
428:
429: =back
430:
431: =cut
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