1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.107 2007/01/31 16:48:54 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 CGI::Cookie();
41: use Fcntl qw(:flock);
42: use LONCAPA;
43:
44: sub cleanup {
45: my ($r)=@_;
46: if (! $r->is_initial_req()) { return DECLINED; }
47: &Apache::lonnet::save_cache();
48: &Apache::lontexconvert::jsMath_reset();
49: return OK;
50: }
51:
52: sub goodbye {
53: my ($r)=@_;
54: &Apache::lonnet::goodbye();
55: return DONE;
56: }
57:
58: ###############################################
59:
60: sub get_posted_cgi {
61: my ($r) = @_;
62:
63: my $buffer;
64: if ($r->header_in('Content-length')) {
65: $r->read($buffer,$r->header_in('Content-length'),0);
66: }
67: unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
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=$1;
80: my @lines = split (/\n/,$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[$i]=~/^$contentsep/) {
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,$lonid,$handle) = @_;
149:
150: my $lonidsdir=$r->dir_config('lonIDsDir');
151: if (!($r->user
152: && (!defined($env{'user.name'}) && !defined($env{'user.domain'}))
153: && (!$lonid || !-e "$lonidsdir/$handle.id" || $handle eq ''))) {
154: # not an SSO case or already logged in
155: return undef;
156: }
157:
158: my ($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: my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
211: my $lonid=$cookies{'lonID'};
212: my $cookie;
213: my $lonidsdir=$r->dir_config('lonIDsDir');
214:
215: my $handle;
216: if ($lonid) {
217: $handle=&LONCAPA::clean_handle($lonid->value);
218: }
219:
220: my $result = &sso_login($r,$lonid,$handle);
221: if (defined($result)) {
222: return $result
223: }
224:
225:
226: if ($r->dir_config("lonBalancer") eq 'yes') {
227: $r->set_handlers('PerlResponseHandler'=>
228: [\&Apache::switchserver::handler]);
229: }
230:
231: if ($handle eq '') {
232: $r->log_reason("Cookie $handle not valid", $r->filename);
233: } elsif ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
234:
235: # ------------------------------------------------------ Initialize Environment
236:
237: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
238:
239: # --------------------------------------------------------- Initialize Language
240:
241: &Apache::lonlocal::get_language_handle($r);
242:
243: }
244:
245: # -------------------------------------------------- Should be a valid user now
246: if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') {
247: # -------------------------------------------------------------- Resource State
248:
249: if ($requrl=~/^\/+(res|uploaded)\//) {
250: $env{'request.state'} = "published";
251: } else {
252: $env{'request.state'} = 'unknown';
253: }
254: $env{'request.filename'} = $r->filename;
255: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
256: # -------------------------------------------------------- Load POST parameters
257:
258: &Apache::lonacc::get_posted_cgi($r);
259:
260: # ---------------------------------------------------------------- Check access
261: my $now = time;
262: if ($requrl !~ m{^/(?:adm|public|prtspool)/}
263: || $requrl =~ /^\/adm\/.*\/(smppg|bulletinboard)(\?|$ )/x) {
264: my $access=&Apache::lonnet::allowed('bre',$requrl);
265: if ($access eq '1') {
266: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
267: return HTTP_NOT_ACCEPTABLE;
268: }
269: if ($access eq 'A') {
270: &Apache::restrictedaccess::setup_handler($r);
271: return OK;
272: }
273: if ($access eq 'B') {
274: &Apache::blockedaccess::setup_handler($r);
275: return OK;
276: }
277: if (($access ne '2') && ($access ne 'F')) {
278: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
279: return HTTP_NOT_ACCEPTABLE;
280: }
281: }
282: if ($requrl =~ m|^/prtspool/|) {
283: my $start='/prtspool/'.$env{'user.name'}.'_'.
284: $env{'user.domain'};
285: if ($requrl !~ /^\Q$start\E/) {
286: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
287: return HTTP_NOT_ACCEPTABLE;
288: }
289: }
290: if ($env{'user.name'} eq 'public' &&
291: $env{'user.domain'} eq 'public' &&
292: $requrl !~ m{^/+(res|public|uploaded)/} &&
293: $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
294: $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
295: $env{'request.querystring'}=$r->args;
296: $env{'request.firsturl'}=$requrl;
297: return FORBIDDEN;
298: }
299: # ------------------------------------------------------------- This is allowed
300: if ($env{'request.course.id'}) {
301: &Apache::lonnet::countacc($requrl);
302: $requrl=~/\.(\w+)$/;
303: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
304: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$ )/x) ||
305: ($requrl=~/^\/adm\/wrapper\//) ||
306: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
307: ($requrl=~m|\.problem/smpedit$|) ||
308: ($requrl=~/^\/public\/.*\/syllabus$/)) {
309: # ------------------------------------- This is serious stuff, get symb and log
310: my $query=$r->args;
311: my $symb;
312: if ($query) {
313: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
314: }
315: if ($env{'form.symb'}) {
316: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
317: if ($requrl =~ m|^/adm/wrapper/|
318: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
319: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
320: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
321: 'last_known' =>[$murl,$mid]);
322: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
323: (($requrl=~m|(.*)/smpedit$|) &&
324: &Apache::lonnet::symbverify($symb,$1))) {
325: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
326: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
327: 'last_known' =>[$murl,$mid]);
328: } else {
329: $r->log_reason('Invalid symb for '.$requrl.': '.
330: $symb);
331: $env{'user.error.msg'}=
332: "$requrl:bre:1:1:Invalid Access";
333: return HTTP_NOT_ACCEPTABLE;
334: }
335: } else {
336: $symb=&Apache::lonnet::symbread($requrl);
337: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
338: !&Apache::lonnet::symbverify($symb,$requrl)) {
339: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
340: $env{'user.error.msg'}=
341: "$requrl:bre:1:1:Invalid Access";
342: return HTTP_NOT_ACCEPTABLE;
343: }
344: if ($symb) {
345: my ($map,$mid,$murl)=
346: &Apache::lonnet::decode_symb($symb);
347: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
348: 'last_known' =>[$murl,$mid]);
349: }
350: }
351: $env{'request.symb'}=$symb;
352: &Apache::lonnet::courseacclog($symb);
353: } else {
354: # ------------------------------------------------------- This is other content
355: &Apache::lonnet::courseacclog($requrl);
356: }
357: }
358: return OK;
359: }
360: # -------------------------------------------- See if this is a public resource
361: if ($requrl=~m|^/+adm/+help/+|) {
362: return OK;
363: }
364: # ------------------------------------ See if this is a viewable portfolio file
365: if (&Apache::lonnet::is_portfolio_url($requrl)) {
366: my $access=&Apache::lonnet::allowed('bre',$requrl);
367: if ($access eq 'A') {
368: &Apache::restrictedaccess::setup_handler($r);
369: return OK;
370: }
371: if (($access ne '2') && ($access ne 'F')) {
372: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
373: return HTTP_NOT_ACCEPTABLE;
374: }
375: }
376:
377: # -------------------------------------------------------------- Not authorized
378: $requrl=~/\.(\w+)$/;
379: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
380: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
381: # ($requrl=~m|^/prtspool/|)) {
382: # -------------------------- Store where they wanted to go and get login screen
383: $env{'request.querystring'}=$r->args;
384: $env{'request.firsturl'}=$requrl;
385: return FORBIDDEN;
386: # } else {
387: # --------------------------------------------------------------------- Goodbye
388: # return HTTP_BAD_REQUEST;
389: # }
390: }
391:
392: 1;
393: __END__
394:
395: =head1 NAME
396:
397: Apache::lonacc - Cookie Based Access Handler
398:
399: =head1 SYNOPSIS
400:
401: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
402:
403: PerlAccessHandler Apache::lonacc
404:
405: =head1 INTRODUCTION
406:
407: This module enables cookie based authentication and is used
408: to control access for many different LON-CAPA URIs.
409:
410: Whenever the client sends the cookie back to the server,
411: this cookie is handled by either lonacc.pm or loncacc.pm
412: (see srm.conf for what is invoked when). If
413: the cookie is missing or invalid, the user is re-challenged
414: for login information.
415:
416: This is part of the LearningOnline Network with CAPA project
417: described at http://www.lon-capa.org.
418:
419: =head1 HANDLER SUBROUTINE
420:
421: This routine is called by Apache and mod_perl.
422:
423: =over 4
424:
425: =item *
426:
427: transfer profile into environment
428:
429: =item *
430:
431: load POST parameters
432:
433: =item *
434:
435: check access
436:
437: =item *
438:
439: if allowed, get symb, log, generate course statistics if applicable
440:
441: =item *
442:
443: otherwise return error
444:
445: =item *
446:
447: see if public resource
448:
449: =item *
450:
451: store attempted access
452:
453: =back
454:
455: =cut
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