1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.102 2006/11/23 01:49:41 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 (! $r->is_initial_req()) { return DECLINED; }
46: &Apache::lonnet::save_cache();
47: &Apache::lontexconvert::jsMath_reset();
48: return OK;
49: }
50:
51: sub goodbye {
52: my ($r)=@_;
53: &Apache::lonnet::goodbye();
54: return DONE;
55: }
56:
57: ###############################################
58:
59: sub get_posted_cgi {
60: my ($r) = @_;
61:
62: my $buffer;
63: if ($r->header_in('Content-length')) {
64: $r->read($buffer,$r->header_in('Content-length'),0);
65: }
66: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
67: my @pairs=split(/&/,$buffer);
68: my $pair;
69: foreach $pair (@pairs) {
70: my ($name,$value) = split(/=/,$pair);
71: $value =~ tr/+/ /;
72: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
73: $name =~ tr/+/ /;
74: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
75: &Apache::loncommon::add_to_env("form.$name",$value);
76: }
77: } else {
78: my $contentsep=$1;
79: my @lines = split (/\n/,$buffer);
80: my $name='';
81: my $value='';
82: my $fname='';
83: my $fmime='';
84: my $i;
85: for ($i=0;$i<=$#lines;$i++) {
86: if ($lines[$i]=~/^$contentsep/) {
87: if ($name) {
88: chomp($value);
89: if ($fname) {
90: $env{"form.$name.filename"}=$fname;
91: $env{"form.$name.mimetype"}=$fmime;
92: } else {
93: $value=~s/\s+$//s;
94: }
95: &Apache::loncommon::add_to_env("form.$name",$value);
96: }
97: if ($i<$#lines) {
98: $i++;
99: $lines[$i]=~
100: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
101: $name=$1;
102: $value='';
103: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
104: $fname=$1;
105: if
106: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
107: $fmime=$1;
108: $i++;
109: } else {
110: $fmime='';
111: }
112: } else {
113: $fname='';
114: $fmime='';
115: }
116: $i++;
117: }
118: } else {
119: $value.=$lines[$i]."\n";
120: }
121: }
122: }
123: #
124: # Digested POSTed values
125: #
126: # Remember the way this was originally done (GET or POST)
127: #
128: $env{'request.method'}=$ENV{'REQUEST_METHOD'};
129: #
130: # There may also be stuff in the query string
131: # Tell subsequent handlers that this was GET, not POST, so they can access query string.
132: # Also, unset POSTed content length to cover all tracks.
133: #
134:
135: $r->method_number(M_GET);
136:
137: $r->method('GET');
138: $r->headers_in->unset('Content-length');
139: }
140:
141: # handle the case of the single sign on user, at this point $r->user
142: # will be set and valid now need to find the loncapa user info and possibly
143: # balance them
144: # returns OK if it was a SSO and user was handled
145: # undef if not SSO or no means to hanle the user
146: sub sso_login {
147: my ($r,$lonid,$handle) = @_;
148:
149: my $lonidsdir=$r->dir_config('lonIDsDir');
150: if (!($r->user
151: && (!defined($env{'user.name'}) && !defined($env{'user.domain'}))
152: && (!$lonid || !-e "$lonidsdir/$handle.id" || $handle eq ''))) {
153: # not an SSO case or already logged in
154: return undef;
155: }
156:
157: my ($user) = ($r->user =~ m/([a-zA-Z0-9_\-@.]*)/);
158:
159: my $domain = $r->dir_config('lonDefDomain');
160: my $home=&Apache::lonnet::homeserver($user,$domain);
161: if ($home !~ /(con_lost|no_host|no_such_host)/) {
162: if ($r->dir_config("lonBalancer") eq 'yes') {
163: # login but immeaditly go to switch server to find us a new
164: # machine
165: &Apache::lonauth::success($r,$user,$domain,$home,'noredirect');
166: $r->internal_redirect('/adm/switchserver');
167: $r->set_handlers('PerlHandler'=> undef);
168: } else {
169: # need to login them in, so generate the need data that
170: # migrate expects to do login
171: my %info=('ip' => $r->connection->remote_ip(),
172: 'domain' => $domain,
173: 'username' => $user,
174: 'server' => $r->dir_config('lonHostID'),
175: 'sso.login' => 1
176: );
177: my $token =
178: &Apache::lonnet::tmpput(\%info,
179: $r->dir_config('lonHostID'));
180: $env{'form.token'} = $token;
181: $r->internal_redirect('/adm/migrateuser');
182: $r->set_handlers('PerlHandler'=> undef);
183: }
184: return OK;
185: } elsif (defined($r->dir_config('lonSSOUserUnknownRedirect'))) {
186: $r->internal_redirect($r->dir_config('lonSSOUserUnknownRedirect'));
187: $r->set_handlers('PerlHandler'=> undef);
188: return OK;
189: }
190: return undef;
191: }
192:
193: sub handler {
194: my $r = shift;
195: my $requrl=$r->uri;
196: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
197: my $lonid=$cookies{'lonID'};
198: my $cookie;
199: my $lonidsdir=$r->dir_config('lonIDsDir');
200:
201: my $handle;
202: if ($lonid) {
203: $handle=&LONCAPA::clean_handle($lonid->value);
204: }
205:
206: my $result = &sso_login($r,$lonid,$handle);
207: if (defined($result)) {
208: return $result
209: }
210:
211:
212: if ($r->dir_config("lonBalancer") eq 'yes') {
213: $r->set_handlers('PerlResponseHandler'=>
214: [\&Apache::switchserver::handler]);
215: }
216:
217: if ($handle eq '') {
218: $r->log_reason("Cookie $handle not valid", $r->filename);
219: } elsif ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
220:
221: # ------------------------------------------------------ Initialize Environment
222:
223: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
224:
225: # --------------------------------------------------------- Initialize Language
226:
227: &Apache::lonlocal::get_language_handle($r);
228:
229: }
230:
231: # -------------------------------------------------- Should be a valid user now
232: if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') {
233: # -------------------------------------------------------------- Resource State
234:
235: if ($requrl=~/^\/+(res|uploaded)\//) {
236: $env{'request.state'} = "published";
237: } else {
238: $env{'request.state'} = 'unknown';
239: }
240: $env{'request.filename'} = $r->filename;
241: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
242: # -------------------------------------------------------- Load POST parameters
243:
244: &Apache::lonacc::get_posted_cgi($r);
245:
246: # ---------------------------------------------------------------- Check access
247: my $now = time;
248: if ($requrl !~ m{^/(?:adm|public|prtspool)/}
249: || $requrl =~ /^\/adm\/.*\/(smppg|bulletinboard)(\?|$ )/x) {
250: my $access=&Apache::lonnet::allowed('bre',$requrl);
251: if ($access eq '1') {
252: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
253: return HTTP_NOT_ACCEPTABLE;
254: }
255: if ($access eq 'A') {
256: &Apache::restrictedaccess::setup_handler($r);
257: return OK;
258: }
259: if (($access ne '2') && ($access ne 'F')) {
260: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
261: return HTTP_NOT_ACCEPTABLE;
262: }
263: }
264: if ($requrl =~ m|^/prtspool/|) {
265: my $start='/prtspool/'.$env{'user.name'}.'_'.
266: $env{'user.domain'};
267: if ($requrl !~ /^\Q$start\E/) {
268: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
269: return HTTP_NOT_ACCEPTABLE;
270: }
271: }
272: if ($env{'user.name'} eq 'public' &&
273: $env{'user.domain'} eq 'public' &&
274: $requrl !~ m{^/+(res|public|uploaded)/} &&
275: $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
276: $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
277: $env{'request.querystring'}=$r->args;
278: $env{'request.firsturl'}=$requrl;
279: return FORBIDDEN;
280: }
281: # ------------------------------------------------------------- This is allowed
282: if ($env{'request.course.id'}) {
283: &Apache::lonnet::countacc($requrl);
284: $requrl=~/\.(\w+)$/;
285: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
286: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$ )/x) ||
287: ($requrl=~/^\/adm\/wrapper\//) ||
288: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
289: ($requrl=~m|\.problem/smpedit$|) ||
290: ($requrl=~/^\/public\/.*\/syllabus$/)) {
291: # ------------------------------------- This is serious stuff, get symb and log
292: my $query=$r->args;
293: my $symb;
294: if ($query) {
295: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
296: }
297: if ($env{'form.symb'}) {
298: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
299: if ($requrl =~ m|^/adm/wrapper/|
300: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
301: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
302: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
303: 'last_known' =>[$murl,$mid]);
304: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
305: (($requrl=~m|(.*)/smpedit$|) &&
306: &Apache::lonnet::symbverify($symb,$1))) {
307: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
308: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
309: 'last_known' =>[$murl,$mid]);
310: } else {
311: $r->log_reason('Invalid symb for '.$requrl.': '.
312: $symb);
313: $env{'user.error.msg'}=
314: "$requrl:bre:1:1:Invalid Access";
315: return HTTP_NOT_ACCEPTABLE;
316: }
317: } else {
318: $symb=&Apache::lonnet::symbread($requrl);
319: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
320: !&Apache::lonnet::symbverify($symb,$requrl)) {
321: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
322: $env{'user.error.msg'}=
323: "$requrl:bre:1:1:Invalid Access";
324: return HTTP_NOT_ACCEPTABLE;
325: }
326: if ($symb) {
327: my ($map,$mid,$murl)=
328: &Apache::lonnet::decode_symb($symb);
329: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
330: 'last_known' =>[$murl,$mid]);
331: }
332: }
333: $env{'request.symb'}=$symb;
334: &Apache::lonnet::courseacclog($symb);
335: } else {
336: # ------------------------------------------------------- This is other content
337: &Apache::lonnet::courseacclog($requrl);
338: }
339: }
340: return OK;
341: }
342: # -------------------------------------------- See if this is a public resource
343: if ($requrl=~m|^/+adm/+help/+|) {
344: return OK;
345: }
346: # ------------------------------------ See if this is a viewable portfolio file
347: if (&Apache::lonnet::is_portfolio_url($requrl)) {
348: my $access=&Apache::lonnet::allowed('bre',$requrl);
349: if ($access eq 'A') {
350: &Apache::restrictedaccess::setup_handler($r);
351: return OK;
352: }
353: if (($access ne '2') && ($access ne 'F')) {
354: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
355: return HTTP_NOT_ACCEPTABLE;
356: }
357: }
358:
359: # -------------------------------------------------------------- Not authorized
360: $requrl=~/\.(\w+)$/;
361: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
362: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
363: # ($requrl=~m|^/prtspool/|)) {
364: # -------------------------- Store where they wanted to go and get login screen
365: $env{'request.querystring'}=$r->args;
366: $env{'request.firsturl'}=$requrl;
367: return FORBIDDEN;
368: # } else {
369: # --------------------------------------------------------------------- Goodbye
370: # return HTTP_BAD_REQUEST;
371: # }
372: }
373:
374: 1;
375: __END__
376:
377: =head1 NAME
378:
379: Apache::lonacc - Cookie Based Access Handler
380:
381: =head1 SYNOPSIS
382:
383: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
384:
385: PerlAccessHandler Apache::lonacc
386:
387: =head1 INTRODUCTION
388:
389: This module enables cookie based authentication and is used
390: to control access for many different LON-CAPA URIs.
391:
392: Whenever the client sends the cookie back to the server,
393: this cookie is handled by either lonacc.pm or loncacc.pm
394: (see srm.conf for what is invoked when). If
395: the cookie is missing or invalid, the user is re-challenged
396: for login information.
397:
398: This is part of the LearningOnline Network with CAPA project
399: described at http://www.lon-capa.org.
400:
401: =head1 HANDLER SUBROUTINE
402:
403: This routine is called by Apache and mod_perl.
404:
405: =over 4
406:
407: =item *
408:
409: transfer profile into environment
410:
411: =item *
412:
413: load POST parameters
414:
415: =item *
416:
417: check access
418:
419: =item *
420:
421: if allowed, get symb, log, generate course statistics if applicable
422:
423: =item *
424:
425: otherwise return error
426:
427: =item *
428:
429: see if public resource
430:
431: =item *
432:
433: store attempted access
434:
435: =back
436:
437: =cut
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