1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.113 2007/11/06 02:42:40 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: my $content_type = $r->header_in('Content-type');
67: if ($content_type !~ m{^multipart/form-data}) {
68: my @pairs=split(/&/,$buffer);
69: my $pair;
70: foreach $pair (@pairs) {
71: my ($name,$value) = split(/=/,$pair);
72: $value =~ tr/+/ /;
73: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
74: $name =~ tr/+/ /;
75: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
76: &Apache::loncommon::add_to_env("form.$name",$value);
77: }
78: } else {
79: my ($contentsep) = ($content_type =~ /boundary=\"?([^\";,]+)\"?/);
80: my @lines = split (/\n/,$buffer);
81: my $name='';
82: my $value='';
83: my $fname='';
84: my $fmime='';
85: my $i;
86: for ($i=0;$i<=$#lines;$i++) {
87: if ($lines[$i]=~/^--\Q$contentsep\E/) {
88: if ($name) {
89: chomp($value);
90: if ($fname) {
91: $env{"form.$name.filename"}=$fname;
92: $env{"form.$name.mimetype"}=$fmime;
93: } else {
94: $value=~s/\s+$//s;
95: }
96: &Apache::loncommon::add_to_env("form.$name",$value);
97: }
98: if ($i<$#lines) {
99: $i++;
100: $lines[$i]=~
101: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
102: $name=$1;
103: $value='';
104: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
105: $fname=$1;
106: if
107: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
108: $fmime=$1;
109: $i++;
110: } else {
111: $fmime='';
112: }
113: } else {
114: $fname='';
115: $fmime='';
116: }
117: $i++;
118: }
119: } else {
120: $value.=$lines[$i]."\n";
121: }
122: }
123: }
124: #
125: # Digested POSTed values
126: #
127: # Remember the way this was originally done (GET or POST)
128: #
129: $env{'request.method'}=$ENV{'REQUEST_METHOD'};
130: #
131: # There may also be stuff in the query string
132: # Tell subsequent handlers that this was GET, not POST, so they can access query string.
133: # Also, unset POSTed content length to cover all tracks.
134: #
135:
136: $r->method_number(M_GET);
137:
138: $r->method('GET');
139: $r->headers_in->unset('Content-length');
140: }
141:
142: # handle the case of the single sign on user, at this point $r->user
143: # will be set and valid now need to find the loncapa user info and possibly
144: # balance them
145: # returns OK if it was a SSO and user was handled
146: # undef if not SSO or no means to hanle the user
147: sub sso_login {
148: my ($r,$handle) = @_;
149:
150: my $lonidsdir=$r->dir_config('lonIDsDir');
151: if (!($r->user
152: && (!defined($env{'user.name'}) && !defined($env{'user.domain'}))
153: && ($handle eq ''))) {
154: # not an SSO case or already logged in
155: return undef;
156: }
157:
158: my ($user) = ($r->user =~ m/([a-zA-Z0-9_\-@.]*)/);
159:
160: my $domain = $r->dir_config('lonDefDomain');
161: my $home=&Apache::lonnet::homeserver($user,$domain);
162: if ($home !~ /(con_lost|no_host|no_such_host)/) {
163: &Apache::lonnet::logthis(" SSO authorized user $user ");
164: if ($r->dir_config("lonBalancer") eq 'yes') {
165: # login but immeaditly go to switch server to find us a new
166: # machine
167: &Apache::lonauth::success($r,$user,$domain,$home,'noredirect');
168: $env{'request.sso.login'} = 1;
169: if (defined($r->dir_config("lonSSOReloginServer"))) {
170: $env{'request.sso.reloginserver'} =
171: $r->dir_config('lonSSOReloginServer');
172: }
173: $r->internal_redirect('/adm/switchserver');
174: $r->set_handlers('PerlHandler'=> undef);
175: } else {
176: # need to login them in, so generate the need data that
177: # migrate expects to do login
178: my %info=('ip' => $r->connection->remote_ip(),
179: 'domain' => $domain,
180: 'username' => $user,
181: 'server' => $r->dir_config('lonHostID'),
182: 'sso.login' => 1
183: );
184: if (defined($r->dir_config("lonSSOReloginServer"))) {
185: $info{'sso.reloginserver'} =
186: $r->dir_config('lonSSOReloginServer');
187: }
188: my $token =
189: &Apache::lonnet::tmpput(\%info,
190: $r->dir_config('lonHostID'));
191: $env{'form.token'} = $token;
192: $r->internal_redirect('/adm/migrateuser');
193: $r->set_handlers('PerlHandler'=> undef);
194: }
195: return OK;
196: } elsif (defined($r->dir_config('lonSSOUserUnknownRedirect'))) {
197: &Apache::lonnet::logthis(" SSO authorized unknown user $user ");
198: $r->subprocess_env->set('SSOUserUnknown' => $user);
199: $r->subprocess_env->set('SSOUserDomain' => $domain);
200: $r->internal_redirect($r->dir_config('lonSSOUserUnknownRedirect'));
201: $r->set_handlers('PerlHandler'=> undef);
202: return OK;
203: }
204: return undef;
205: }
206:
207: sub handler {
208: my $r = shift;
209: my $requrl=$r->uri;
210: if (&Apache::lonnet::is_domainimage($requrl)) {
211: return OK;
212: }
213:
214:
215: my $handle = &Apache::lonnet::check_for_valid_session($r);
216:
217: my $result = &sso_login($r,$handle);
218: if (defined($result)) {
219: return $result
220: }
221:
222:
223: if ($r->dir_config("lonBalancer") eq 'yes') {
224: $r->set_handlers('PerlResponseHandler'=>
225: [\&Apache::switchserver::handler]);
226: }
227:
228: if ($handle eq '') {
229: $r->log_reason("Cookie $handle not valid", $r->filename);
230: } elsif ($handle ne '') {
231:
232: # ------------------------------------------------------ Initialize Environment
233: my $lonidsdir=$r->dir_config('lonIDsDir');
234: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
235:
236: # --------------------------------------------------------- Initialize Language
237:
238: &Apache::lonlocal::get_language_handle($r);
239:
240: }
241:
242: # -------------------------------------------------- Should be a valid user now
243: if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') {
244: # -------------------------------------------------------------- Resource State
245:
246: if ($requrl=~/^\/+(res|uploaded)\//) {
247: $env{'request.state'} = "published";
248: } else {
249: $env{'request.state'} = 'unknown';
250: }
251: $env{'request.filename'} = $r->filename;
252: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
253: # -------------------------------------------------------- Load POST parameters
254:
255: &Apache::lonacc::get_posted_cgi($r);
256:
257: # ---------------------------------------------------------------- Check access
258: my $now = time;
259: if ($requrl !~ m{^/(?:adm|public|prtspool)/}
260: || $requrl =~ /^\/adm\/.*\/(smppg|bulletinboard)(\?|$ )/x) {
261: my $access=&Apache::lonnet::allowed('bre',$requrl);
262: if ($access eq '1') {
263: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
264: return HTTP_NOT_ACCEPTABLE;
265: }
266: if ($access eq 'A') {
267: &Apache::restrictedaccess::setup_handler($r);
268: return OK;
269: }
270: if ($access eq 'B') {
271: &Apache::blockedaccess::setup_handler($r);
272: return OK;
273: }
274: if (($access ne '2') && ($access ne 'F')) {
275: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
276: return HTTP_NOT_ACCEPTABLE;
277: }
278: }
279: if ($requrl =~ m|^/prtspool/|) {
280: my $start='/prtspool/'.$env{'user.name'}.'_'.
281: $env{'user.domain'};
282: if ($requrl !~ /^\Q$start\E/) {
283: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
284: return HTTP_NOT_ACCEPTABLE;
285: }
286: }
287: if ($requrl =~ m|^/zipspool/|) {
288: my $start='/zipspool/zipout/'.$env{'user.name'}.":".
289: $env{'user.domain'};
290: if ($requrl !~ /^\Q$start\E/) {
291: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
292: return HTTP_NOT_ACCEPTABLE;
293: }
294: }
295: if ($env{'user.name'} eq 'public' &&
296: $env{'user.domain'} eq 'public' &&
297: $requrl !~ m{^/+(res|public|uploaded)/} &&
298: $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
299: $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
300: $env{'request.querystring'}=$r->args;
301: $env{'request.firsturl'}=$requrl;
302: return FORBIDDEN;
303: }
304: # ------------------------------------------------------------- This is allowed
305: if ($env{'request.course.id'}) {
306: &Apache::lonnet::countacc($requrl);
307: $requrl=~/\.(\w+)$/;
308: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
309: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$ )/x) ||
310: ($requrl=~/^\/adm\/wrapper\//) ||
311: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
312: ($requrl=~m|\.problem/smpedit$|) ||
313: ($requrl=~/^\/public\/.*\/syllabus$/)) {
314: # ------------------------------------- This is serious stuff, get symb and log
315: my $query=$r->args;
316: my $symb;
317: if ($query) {
318: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
319: }
320: if ($env{'form.symb'}) {
321: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
322: if ($requrl =~ m|^/adm/wrapper/|
323: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
324: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
325: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
326: 'last_known' =>[$murl,$mid]);
327: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
328: (($requrl=~m|(.*)/smpedit$|) &&
329: &Apache::lonnet::symbverify($symb,$1))) {
330: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
331: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
332: 'last_known' =>[$murl,$mid]);
333: } else {
334: $r->log_reason('Invalid symb for '.$requrl.': '.
335: $symb);
336: $env{'user.error.msg'}=
337: "$requrl:bre:1:1:Invalid Access";
338: return HTTP_NOT_ACCEPTABLE;
339: }
340: } else {
341: $symb=&Apache::lonnet::symbread($requrl);
342: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
343: !&Apache::lonnet::symbverify($symb,$requrl)) {
344: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
345: $env{'user.error.msg'}=
346: "$requrl:bre:1:1:Invalid Access";
347: return HTTP_NOT_ACCEPTABLE;
348: }
349: if ($symb) {
350: my ($map,$mid,$murl)=
351: &Apache::lonnet::decode_symb($symb);
352: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
353: 'last_known' =>[$murl,$mid]);
354: }
355: }
356: $env{'request.symb'}=$symb;
357: &Apache::lonnet::courseacclog($symb);
358: } else {
359: # ------------------------------------------------------- This is other content
360: &Apache::lonnet::courseacclog($requrl);
361: }
362: }
363: return OK;
364: }
365: # -------------------------------------------- See if this is a public resource
366: if ($requrl=~m|^/+adm/+help/+|) {
367: return OK;
368: }
369: # ------------------------------------ See if this is a viewable portfolio file
370: if (&Apache::lonnet::is_portfolio_url($requrl)) {
371: my $access=&Apache::lonnet::allowed('bre',$requrl);
372: if ($access eq 'A') {
373: &Apache::restrictedaccess::setup_handler($r);
374: return OK;
375: }
376: if (($access ne '2') && ($access ne 'F')) {
377: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
378: return HTTP_NOT_ACCEPTABLE;
379: }
380: }
381:
382: # -------------------------------------------------------------- Not authorized
383: $requrl=~/\.(\w+)$/;
384: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
385: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
386: # ($requrl=~m|^/prtspool/|)) {
387: # -------------------------- Store where they wanted to go and get login screen
388: $env{'request.querystring'}=$r->args;
389: $env{'request.firsturl'}=$requrl;
390: return FORBIDDEN;
391: # } else {
392: # --------------------------------------------------------------------- Goodbye
393: # return HTTP_BAD_REQUEST;
394: # }
395: }
396:
397: 1;
398: __END__
399:
400: =head1 NAME
401:
402: Apache::lonacc - Cookie Based Access Handler
403:
404: =head1 SYNOPSIS
405:
406: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
407:
408: PerlAccessHandler Apache::lonacc
409:
410: =head1 INTRODUCTION
411:
412: This module enables cookie based authentication and is used
413: to control access for many different LON-CAPA URIs.
414:
415: Whenever the client sends the cookie back to the server,
416: this cookie is handled by either lonacc.pm or loncacc.pm
417: (see srm.conf for what is invoked when). If
418: the cookie is missing or invalid, the user is re-challenged
419: for login information.
420:
421: This is part of the LearningOnline Network with CAPA project
422: described at http://www.lon-capa.org.
423:
424: =head1 HANDLER SUBROUTINE
425:
426: This routine is called by Apache and mod_perl.
427:
428: =over 4
429:
430: =item *
431:
432: transfer profile into environment
433:
434: =item *
435:
436: load POST parameters
437:
438: =item *
439:
440: check access
441:
442: =item *
443:
444: if allowed, get symb, log, generate course statistics if applicable
445:
446: =item *
447:
448: otherwise return error
449:
450: =item *
451:
452: see if public resource
453:
454: =item *
455:
456: store attempted access
457:
458: =back
459:
460: =cut
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