1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.98 2006/09/12 14:45:05 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: } else {
168: # need to login them in, so generate the need data that
169: # migrate expects to do login
170: my %info=('ip' => $r->connection->remote_ip(),
171: 'domain' => $domain,
172: 'username' => $user,
173: 'server' => $r->dir_config('lonHostID'),
174: 'sso.login' => 1
175: );
176: my $token =
177: &Apache::lonnet::tmpput(\%info,
178: $r->dir_config('lonHostID'));
179: $env{'form.token'} = $token;
180: $r->internal_redirect('/adm/migrateuser');
181: }
182: return OK;
183: } elsif (defined($r->dir_config('lonSSOUserUnknownRedirect'))) {
184: $r->internal_redirect($r->dir_config('lonSSOUserUnknownRedirect'));
185: return OK;
186: }
187: return undef;
188: }
189:
190: sub handler {
191: my $r = shift;
192: my $requrl=$r->uri;
193: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
194: my $lonid=$cookies{'lonID'};
195: my $cookie;
196: my $lonidsdir=$r->dir_config('lonIDsDir');
197:
198: my $handle;
199: if ($lonid) {
200: $handle=$lonid->value;
201: $handle=~s/\W//g;
202: }
203:
204: if (my $result = &sso_login($r,$lonid,$handle)) {
205: return $result
206: }
207:
208:
209: if ($r->dir_config("lonBalancer") eq 'yes') {
210: $r->set_handlers('PerlResponseHandler'=>
211: [\&Apache::switchserver::handler]);
212: }
213:
214: if ($handle eq '') {
215: $r->log_reason("Cookie $handle not valid", $r->filename);
216: } elsif ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
217:
218: # ------------------------------------------------------ Initialize Environment
219:
220: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
221:
222: # --------------------------------------------------------- Initialize Language
223:
224: &Apache::lonlocal::get_language_handle($r);
225:
226: }
227:
228: # -------------------------------------------------- Should be a valid user now
229: if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') {
230: # -------------------------------------------------------------- Resource State
231:
232: if ($requrl=~/^\/+(res|uploaded)\//) {
233: $env{'request.state'} = "published";
234: } else {
235: $env{'request.state'} = 'unknown';
236: }
237: $env{'request.filename'} = $r->filename;
238: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
239: # -------------------------------------------------------- Load POST parameters
240:
241: &Apache::lonacc::get_posted_cgi($r);
242:
243: # ---------------------------------------------------------------- Check access
244: my $now = time;
245: if ($requrl !~ m{^/(?:adm|public|prtspool)/}
246: || $requrl =~ /^\/adm\/.*\/(smppg|bulletinboard)(\?|$ )/x) {
247: my $access=&Apache::lonnet::allowed('bre',$requrl);
248: if ($access eq '1') {
249: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
250: return HTTP_NOT_ACCEPTABLE;
251: }
252: if ($access eq 'A') {
253: &Apache::restrictedaccess::setup_handler($r);
254: return OK;
255: }
256: if (($access ne '2') && ($access ne 'F')) {
257: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
258: return HTTP_NOT_ACCEPTABLE;
259: }
260: }
261: if ($requrl =~ m|^/prtspool/|) {
262: my $start='/prtspool/'.$env{'user.name'}.'_'.
263: $env{'user.domain'};
264: if ($requrl !~ /^\Q$start\E/) {
265: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
266: return HTTP_NOT_ACCEPTABLE;
267: }
268: }
269: if ($env{'user.name'} eq 'public' &&
270: $env{'user.domain'} eq 'public' &&
271: $requrl !~ m{^/+(res|public|uploaded)/} &&
272: $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
273: $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
274: $env{'request.querystring'}=$r->args;
275: $env{'request.firsturl'}=$requrl;
276: return FORBIDDEN;
277: }
278: # ------------------------------------------------------------- This is allowed
279: if ($env{'request.course.id'}) {
280: &Apache::lonnet::countacc($requrl);
281: $requrl=~/\.(\w+)$/;
282: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
283: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$ )/x) ||
284: ($requrl=~/^\/adm\/wrapper\//) ||
285: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
286: ($requrl=~m|\.problem/smpedit$|) ||
287: ($requrl=~/^\/public\/.*\/syllabus$/)) {
288: # ------------------------------------- This is serious stuff, get symb and log
289: my $query=$r->args;
290: my $symb;
291: if ($query) {
292: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
293: }
294: if ($env{'form.symb'}) {
295: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
296: if ($requrl =~ m|^/adm/wrapper/|
297: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
298: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
299: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
300: 'last_known' =>[$murl,$mid]);
301: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
302: (($requrl=~m|(.*)/smpedit$|) &&
303: &Apache::lonnet::symbverify($symb,$1))) {
304: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
305: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
306: 'last_known' =>[$murl,$mid]);
307: } else {
308: $r->log_reason('Invalid symb for '.$requrl.': '.
309: $symb);
310: $env{'user.error.msg'}=
311: "$requrl:bre:1:1:Invalid Access";
312: return HTTP_NOT_ACCEPTABLE;
313: }
314: } else {
315: $symb=&Apache::lonnet::symbread($requrl);
316: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
317: !&Apache::lonnet::symbverify($symb,$requrl)) {
318: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
319: $env{'user.error.msg'}=
320: "$requrl:bre:1:1:Invalid Access";
321: return HTTP_NOT_ACCEPTABLE;
322: }
323: if ($symb) {
324: my ($map,$mid,$murl)=
325: &Apache::lonnet::decode_symb($symb);
326: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
327: 'last_known' =>[$murl,$mid]);
328: }
329: }
330: $env{'request.symb'}=$symb;
331: &Apache::lonnet::courseacclog($symb);
332: } else {
333: # ------------------------------------------------------- This is other content
334: &Apache::lonnet::courseacclog($requrl);
335: }
336: }
337: return OK;
338: }
339: # -------------------------------------------- See if this is a public resource
340: if ($requrl=~m|^/+adm/+help/+|) {
341: return OK;
342: }
343: # ------------------------------------ See if this is a viewable portfolio file
344: if (&Apache::lonnet::is_portfolio_url($requrl)) {
345: my $access=&Apache::lonnet::allowed('bre',$requrl);
346: if ($access eq 'A') {
347: &Apache::restrictedaccess::setup_handler($r);
348: return OK;
349: }
350: if (($access ne '2') && ($access ne 'F')) {
351: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
352: return HTTP_NOT_ACCEPTABLE;
353: }
354: }
355:
356: # -------------------------------------------------------------- Not authorized
357: $requrl=~/\.(\w+)$/;
358: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
359: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
360: # ($requrl=~m|^/prtspool/|)) {
361: # -------------------------- Store where they wanted to go and get login screen
362: $env{'request.querystring'}=$r->args;
363: $env{'request.firsturl'}=$requrl;
364: return FORBIDDEN;
365: # } else {
366: # --------------------------------------------------------------------- Goodbye
367: # return HTTP_BAD_REQUEST;
368: # }
369: }
370:
371: 1;
372: __END__
373:
374: =head1 NAME
375:
376: Apache::lonacc - Cookie Based Access Handler
377:
378: =head1 SYNOPSIS
379:
380: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
381:
382: PerlAccessHandler Apache::lonacc
383:
384: =head1 INTRODUCTION
385:
386: This module enables cookie based authentication and is used
387: to control access for many different LON-CAPA URIs.
388:
389: Whenever the client sends the cookie back to the server,
390: this cookie is handled by either lonacc.pm or loncacc.pm
391: (see srm.conf for what is invoked when). If
392: the cookie is missing or invalid, the user is re-challenged
393: for login information.
394:
395: This is part of the LearningOnline Network with CAPA project
396: described at http://www.lon-capa.org.
397:
398: =head1 HANDLER SUBROUTINE
399:
400: This routine is called by Apache and mod_perl.
401:
402: =over 4
403:
404: =item *
405:
406: transfer profile into environment
407:
408: =item *
409:
410: load POST parameters
411:
412: =item *
413:
414: check access
415:
416: =item *
417:
418: if allowed, get symb, log, generate course statistics if applicable
419:
420: =item *
421:
422: otherwise return error
423:
424: =item *
425:
426: see if public resource
427:
428: =item *
429:
430: store attempted access
431:
432: =back
433:
434: =cut
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