1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.111 2007/10/02 01:09:59 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 Apache::blockedaccess();
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,$handle) = @_;
148:
149: my $lonidsdir=$r->dir_config('lonIDsDir');
150: if (!($r->user
151: && (!defined($env{'user.name'}) && !defined($env{'user.domain'}))
152: && ($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: &Apache::lonnet::logthis(" SSO authorized user $user ");
163: if ($r->dir_config("lonBalancer") eq 'yes') {
164: # login but immeaditly go to switch server to find us a new
165: # machine
166: &Apache::lonauth::success($r,$user,$domain,$home,'noredirect');
167: $env{'request.sso.login'} = 1;
168: if (defined($r->dir_config("lonSSOReloginServer"))) {
169: $env{'request.sso.reloginserver'} =
170: $r->dir_config('lonSSOReloginServer');
171: }
172: $r->internal_redirect('/adm/switchserver');
173: $r->set_handlers('PerlHandler'=> undef);
174: } else {
175: # need to login them in, so generate the need data that
176: # migrate expects to do login
177: my %info=('ip' => $r->connection->remote_ip(),
178: 'domain' => $domain,
179: 'username' => $user,
180: 'server' => $r->dir_config('lonHostID'),
181: 'sso.login' => 1
182: );
183: if (defined($r->dir_config("lonSSOReloginServer"))) {
184: $info{'sso.reloginserver'} =
185: $r->dir_config('lonSSOReloginServer');
186: }
187: my $token =
188: &Apache::lonnet::tmpput(\%info,
189: $r->dir_config('lonHostID'));
190: $env{'form.token'} = $token;
191: $r->internal_redirect('/adm/migrateuser');
192: $r->set_handlers('PerlHandler'=> undef);
193: }
194: return OK;
195: } elsif (defined($r->dir_config('lonSSOUserUnknownRedirect'))) {
196: &Apache::lonnet::logthis(" SSO authorized unknown user $user ");
197: $r->subprocess_env->set('SSOUserUnknown' => $user);
198: $r->subprocess_env->set('SSOUserDomain' => $domain);
199: $r->internal_redirect($r->dir_config('lonSSOUserUnknownRedirect'));
200: $r->set_handlers('PerlHandler'=> undef);
201: return OK;
202: }
203: return undef;
204: }
205:
206: sub handler {
207: my $r = shift;
208: my $requrl=$r->uri;
209: if (&Apache::lonnet::is_domainimage($requrl)) {
210: return OK;
211: }
212:
213:
214: my $handle = &Apache::lonnet::check_for_valid_session($r);
215:
216: my $result = &sso_login($r,$handle);
217: if (defined($result)) {
218: return $result
219: }
220:
221:
222: if ($r->dir_config("lonBalancer") eq 'yes') {
223: $r->set_handlers('PerlResponseHandler'=>
224: [\&Apache::switchserver::handler]);
225: }
226:
227: if ($handle eq '') {
228: $r->log_reason("Cookie $handle not valid", $r->filename);
229: } elsif ($handle ne '') {
230:
231: # ------------------------------------------------------ Initialize Environment
232: my $lonidsdir=$r->dir_config('lonIDsDir');
233: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
234:
235: # --------------------------------------------------------- Initialize Language
236:
237: &Apache::lonlocal::get_language_handle($r);
238:
239: }
240:
241: # -------------------------------------------------- Should be a valid user now
242: if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') {
243: # -------------------------------------------------------------- Resource State
244:
245: if ($requrl=~/^\/+(res|uploaded)\//) {
246: $env{'request.state'} = "published";
247: } else {
248: $env{'request.state'} = 'unknown';
249: }
250: $env{'request.filename'} = $r->filename;
251: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
252: # -------------------------------------------------------- Load POST parameters
253:
254: &Apache::lonacc::get_posted_cgi($r);
255:
256: # ---------------------------------------------------------------- Check access
257: my $now = time;
258: if ($requrl !~ m{^/(?:adm|public|prtspool)/}
259: || $requrl =~ /^\/adm\/.*\/(smppg|bulletinboard)(\?|$ )/x) {
260: my $access=&Apache::lonnet::allowed('bre',$requrl);
261: if ($access eq '1') {
262: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
263: return HTTP_NOT_ACCEPTABLE;
264: }
265: if ($access eq 'A') {
266: &Apache::restrictedaccess::setup_handler($r);
267: return OK;
268: }
269: if ($access eq 'B') {
270: &Apache::blockedaccess::setup_handler($r);
271: return OK;
272: }
273: if (($access ne '2') && ($access ne 'F')) {
274: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
275: return HTTP_NOT_ACCEPTABLE;
276: }
277: }
278: if ($requrl =~ m|^/prtspool/|) {
279: my $start='/prtspool/'.$env{'user.name'}.'_'.
280: $env{'user.domain'};
281: if ($requrl !~ /^\Q$start\E/) {
282: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
283: return HTTP_NOT_ACCEPTABLE;
284: }
285: }
286: if ($requrl =~ m|^/zipspool/|) {
287: my $start='/zipspool/zipout/'.$env{'user.name'}.":".
288: $env{'user.domain'};
289: if ($requrl !~ /^\Q$start\E/) {
290: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
291: return HTTP_NOT_ACCEPTABLE;
292: }
293: }
294: if ($env{'user.name'} eq 'public' &&
295: $env{'user.domain'} eq 'public' &&
296: $requrl !~ m{^/+(res|public|uploaded)/} &&
297: $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
298: $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
299: $env{'request.querystring'}=$r->args;
300: $env{'request.firsturl'}=$requrl;
301: return FORBIDDEN;
302: }
303: # ------------------------------------------------------------- This is allowed
304: if ($env{'request.course.id'}) {
305: &Apache::lonnet::countacc($requrl);
306: $requrl=~/\.(\w+)$/;
307: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
308: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$ )/x) ||
309: ($requrl=~/^\/adm\/wrapper\//) ||
310: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
311: ($requrl=~m|\.problem/smpedit$|) ||
312: ($requrl=~/^\/public\/.*\/syllabus$/)) {
313: # ------------------------------------- This is serious stuff, get symb and log
314: my $query=$r->args;
315: my $symb;
316: if ($query) {
317: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
318: }
319: if ($env{'form.symb'}) {
320: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
321: if ($requrl =~ m|^/adm/wrapper/|
322: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
323: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
324: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
325: 'last_known' =>[$murl,$mid]);
326: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
327: (($requrl=~m|(.*)/smpedit$|) &&
328: &Apache::lonnet::symbverify($symb,$1))) {
329: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
330: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
331: 'last_known' =>[$murl,$mid]);
332: } else {
333: $r->log_reason('Invalid symb for '.$requrl.': '.
334: $symb);
335: $env{'user.error.msg'}=
336: "$requrl:bre:1:1:Invalid Access";
337: return HTTP_NOT_ACCEPTABLE;
338: }
339: } else {
340: $symb=&Apache::lonnet::symbread($requrl);
341: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
342: !&Apache::lonnet::symbverify($symb,$requrl)) {
343: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
344: $env{'user.error.msg'}=
345: "$requrl:bre:1:1:Invalid Access";
346: return HTTP_NOT_ACCEPTABLE;
347: }
348: if ($symb) {
349: my ($map,$mid,$murl)=
350: &Apache::lonnet::decode_symb($symb);
351: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
352: 'last_known' =>[$murl,$mid]);
353: }
354: }
355: $env{'request.symb'}=$symb;
356: &Apache::lonnet::courseacclog($symb);
357: } else {
358: # ------------------------------------------------------- This is other content
359: &Apache::lonnet::courseacclog($requrl);
360: }
361: }
362: return OK;
363: }
364: # -------------------------------------------- See if this is a public resource
365: if ($requrl=~m|^/+adm/+help/+|) {
366: return OK;
367: }
368: # ------------------------------------ See if this is a viewable portfolio file
369: if (&Apache::lonnet::is_portfolio_url($requrl)) {
370: my $access=&Apache::lonnet::allowed('bre',$requrl);
371: if ($access eq 'A') {
372: &Apache::restrictedaccess::setup_handler($r);
373: return OK;
374: }
375: if (($access ne '2') && ($access ne 'F')) {
376: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
377: return HTTP_NOT_ACCEPTABLE;
378: }
379: }
380:
381: # -------------------------------------------------------------- Not authorized
382: $requrl=~/\.(\w+)$/;
383: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
384: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
385: # ($requrl=~m|^/prtspool/|)) {
386: # -------------------------- Store where they wanted to go and get login screen
387: $env{'request.querystring'}=$r->args;
388: $env{'request.firsturl'}=$requrl;
389: return FORBIDDEN;
390: # } else {
391: # --------------------------------------------------------------------- Goodbye
392: # return HTTP_BAD_REQUEST;
393: # }
394: }
395:
396: 1;
397: __END__
398:
399: =head1 NAME
400:
401: Apache::lonacc - Cookie Based Access Handler
402:
403: =head1 SYNOPSIS
404:
405: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
406:
407: PerlAccessHandler Apache::lonacc
408:
409: =head1 INTRODUCTION
410:
411: This module enables cookie based authentication and is used
412: to control access for many different LON-CAPA URIs.
413:
414: Whenever the client sends the cookie back to the server,
415: this cookie is handled by either lonacc.pm or loncacc.pm
416: (see srm.conf for what is invoked when). If
417: the cookie is missing or invalid, the user is re-challenged
418: for login information.
419:
420: This is part of the LearningOnline Network with CAPA project
421: described at http://www.lon-capa.org.
422:
423: =head1 HANDLER SUBROUTINE
424:
425: This routine is called by Apache and mod_perl.
426:
427: =over 4
428:
429: =item *
430:
431: transfer profile into environment
432:
433: =item *
434:
435: load POST parameters
436:
437: =item *
438:
439: check access
440:
441: =item *
442:
443: if allowed, get symb, log, generate course statistics if applicable
444:
445: =item *
446:
447: otherwise return error
448:
449: =item *
450:
451: see if public resource
452:
453: =item *
454:
455: store attempted access
456:
457: =back
458:
459: =cut
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