1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.119 2008/11/18 19:14:34 jms 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: =head1 NAME
31:
32: Apache::lonacc - Cookie Based Access Handler
33:
34: =head1 SYNOPSIS
35:
36: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
37:
38: PerlAccessHandler Apache::lonacc
39:
40: =head1 INTRODUCTION
41:
42: This module enables cookie based authentication and is used
43: to control access for many different LON-CAPA URIs.
44:
45: Whenever the client sends the cookie back to the server,
46: this cookie is handled by either lonacc.pm or loncacc.pm
47: (see srm.conf for what is invoked when). If
48: the cookie is missing or invalid, the user is re-challenged
49: for login information.
50:
51: This is part of the LearningOnline Network with CAPA project
52: described at http://www.lon-capa.org.
53:
54: =head1 HANDLER SUBROUTINE
55:
56: This routine is called by Apache and mod_perl.
57:
58: =over 4
59:
60: =item *
61:
62: transfer profile into environment
63:
64: =item *
65:
66: load POST parameters
67:
68: =item *
69:
70: check access
71:
72: =item *
73:
74: if allowed, get symb, log, generate course statistics if applicable
75:
76: =item *
77:
78: otherwise return error
79:
80: =item *
81:
82: see if public resource
83:
84: =item *
85:
86: store attempted access
87:
88: =back
89:
90: =cut
91:
92:
93: package Apache::lonacc;
94:
95: use strict;
96: use Apache::Constants qw(:common :http :methods);
97: use Apache::File;
98: use Apache::lonnet;
99: use Apache::loncommon();
100: use Apache::lonlocal;
101: use Apache::restrictedaccess();
102: use Apache::blockedaccess();
103: use Fcntl qw(:flock);
104: use LONCAPA;
105:
106: sub cleanup {
107: my ($r)=@_;
108: if (! $r->is_initial_req()) { return DECLINED; }
109: &Apache::lonnet::save_cache();
110: &Apache::lontexconvert::jsMath_reset();
111: return OK;
112: }
113:
114: sub goodbye {
115: my ($r)=@_;
116: &Apache::lonnet::goodbye();
117: return DONE;
118: }
119:
120: ###############################################
121:
122: sub get_posted_cgi {
123: my ($r,$fields) = @_;
124:
125: my $buffer;
126: if ($r->header_in('Content-length')) {
127: $r->read($buffer,$r->header_in('Content-length'),0);
128: }
129: my $content_type = $r->header_in('Content-type');
130: if ($content_type !~ m{^multipart/form-data}) {
131: my @pairs=split(/&/,$buffer);
132: my $pair;
133: foreach $pair (@pairs) {
134: my ($name,$value) = split(/=/,$pair);
135: $value =~ tr/+/ /;
136: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
137: $name =~ tr/+/ /;
138: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
139: if (ref($fields) eq 'ARRAY') {
140: next if (!grep(/^\Q$name\E$/,@{$fields}));
141: }
142: &Apache::loncommon::add_to_env("form.$name",$value);
143: }
144: } else {
145: my ($contentsep) = ($content_type =~ /boundary=\"?([^\";,]+)\"?/);
146: my @lines = split (/\n/,$buffer);
147: my $name='';
148: my $value='';
149: my $fname='';
150: my $fmime='';
151: my $i;
152: for ($i=0;$i<=$#lines;$i++) {
153: if ($lines[$i]=~/^--\Q$contentsep\E/) {
154: if ($name) {
155: chomp($value);
156: if (ref($fields) eq 'ARRAY') {
157: next if (!grep(/^\Q$name\E$/,@{$fields}));
158: }
159: if ($fname) {
160: if ($env{'form.symb'} ne '') {
161: my $size = (length($value))/(1024.0 * 1024.0);
162: if (&upload_size_allowed($name,$size,$fname) eq 'ok') {
163: $env{"form.$name.filename"}=$fname;
164: $env{"form.$name.mimetype"}=$fmime;
165: &Apache::loncommon::add_to_env("form.$name",$value);
166: }
167: } else {
168: $env{"form.$name.filename"}=$fname;
169: $env{"form.$name.mimetype"}=$fmime;
170: &Apache::loncommon::add_to_env("form.$name",$value);
171: }
172: } else {
173: $value=~s/\s+$//s;
174: &Apache::loncommon::add_to_env("form.$name",$value);
175: }
176: }
177: if ($i<$#lines) {
178: $i++;
179: $lines[$i]=~
180: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
181: $name=$1;
182: $value='';
183: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
184: $fname=$1;
185: if
186: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
187: $fmime=$1;
188: $i++;
189: } else {
190: $fmime='';
191: }
192: } else {
193: $fname='';
194: $fmime='';
195: }
196: $i++;
197: }
198: } else {
199: $value.=$lines[$i]."\n";
200: }
201: }
202: }
203: #
204: # Digested POSTed values
205: #
206: # Remember the way this was originally done (GET or POST)
207: #
208: $env{'request.method'}=$ENV{'REQUEST_METHOD'};
209: #
210: # There may also be stuff in the query string
211: # Tell subsequent handlers that this was GET, not POST, so they can access query string.
212: # Also, unset POSTed content length to cover all tracks.
213: #
214:
215: $r->method_number(M_GET);
216:
217: $r->method('GET');
218: $r->headers_in->unset('Content-length');
219: }
220:
221: #
222: # Perform size checks for file uploads to essayresponse items in course context.
223: #
224: # Add form.HWFILESIZE.$part_$id to %env with file size (MB)
225: # If file exceeds maximum allowed size, add form.HWFILETOOBIG.$part_$id to %env.
226: #
227:
228: sub upload_size_allowed {
229: my ($name,$size,$fname) = @_;
230: if ($name =~ /^HWFILE(\w+)$/) {
231: my $ident = $1;
232: my $item = 'HWFILESIZE'.$ident;
233: &Apache::loncommon::add_to_env("form.$item",$size);
234: my $maxsize= &Apache::lonnet::EXT("resource.$ident.maxfilesize");
235: if (!$maxsize) {
236: $maxsize = 100.0;
237: }
238: if ($size > $maxsize) {
239: my $warn = 'HWFILETOOBIG'.$ident;
240: &Apache::loncommon::add_to_env("form.$warn",$fname);
241: return;
242: }
243: }
244: return 'ok';
245: }
246:
247: # handle the case of the single sign on user, at this point $r->user
248: # will be set and valid now need to find the loncapa user info and possibly
249: # balance them
250: # returns OK if it was a SSO and user was handled
251: # undef if not SSO or no means to hanle the user
252:
253: sub sso_login {
254: my ($r,$handle) = @_;
255:
256: my $lonidsdir=$r->dir_config('lonIDsDir');
257: if (!($r->user
258: && (!defined($env{'user.name'}) && !defined($env{'user.domain'}))
259: && ($handle eq ''))) {
260: # not an SSO case or already logged in
261: return undef;
262: }
263:
264: my ($user) = ($r->user =~ m/([a-zA-Z0-9_\-@.]*)/);
265:
266: my $domain = $r->dir_config('lonDefDomain');
267: my $home=&Apache::lonnet::homeserver($user,$domain);
268: if ($home !~ /(con_lost|no_host|no_such_host)/) {
269: &Apache::lonnet::logthis(" SSO authorized user $user ");
270: if ($r->dir_config("lonBalancer") eq 'yes') {
271: # login but immeaditly go to switch server to find us a new
272: # machine
273: &Apache::lonauth::success($r,$user,$domain,$home,'noredirect');
274: $env{'request.sso.login'} = 1;
275: if (defined($r->dir_config("lonSSOReloginServer"))) {
276: $env{'request.sso.reloginserver'} =
277: $r->dir_config('lonSSOReloginServer');
278: }
279: $r->internal_redirect('/adm/switchserver');
280: $r->set_handlers('PerlHandler'=> undef);
281: } else {
282: # need to login them in, so generate the need data that
283: # migrate expects to do login
284: my %info=('ip' => $r->connection->remote_ip(),
285: 'domain' => $domain,
286: 'username' => $user,
287: 'server' => $r->dir_config('lonHostID'),
288: 'sso.login' => 1
289: );
290: if ($r->dir_config("ssodirecturl") == 1) {
291: $info{'origurl'} = $r->uri;
292: }
293: if (defined($r->dir_config("lonSSOReloginServer"))) {
294: $info{'sso.reloginserver'} =
295: $r->dir_config('lonSSOReloginServer');
296: }
297: my $token =
298: &Apache::lonnet::tmpput(\%info,
299: $r->dir_config('lonHostID'));
300: $env{'form.token'} = $token;
301: $r->internal_redirect('/adm/migrateuser');
302: $r->set_handlers('PerlHandler'=> undef);
303: }
304: return OK;
305: } elsif (defined($r->dir_config('lonSSOUserUnknownRedirect'))) {
306: &Apache::lonnet::logthis(" SSO authorized unknown user $user ");
307: $r->subprocess_env->set('SSOUserUnknown' => $user);
308: $r->subprocess_env->set('SSOUserDomain' => $domain);
309: my @cancreate;
310: my %domconfig =
311: &Apache::lonnet::get_dom('configuration',['usercreation'],$domain);
312: if (ref($domconfig{'usercreation'}) eq 'HASH') {
313: if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {
314: if (ref($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}) eq 'ARRAY') {
315: @cancreate = @{$domconfig{'usercreation'}{'cancreate'}{'selfcreate'}};
316: } elsif (($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') &&
317: ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne '')) {
318: @cancreate = ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'});
319: }
320: }
321: }
322: if (grep(/^sso$/,@cancreate)) {
323: $r->internal_redirect('/adm/createaccount');
324: } else {
325: $r->internal_redirect($r->dir_config('lonSSOUserUnknownRedirect'));
326: }
327: $r->set_handlers('PerlHandler'=> undef);
328: return OK;
329: }
330: return undef;
331: }
332:
333: sub handler {
334: my $r = shift;
335: my $requrl=$r->uri;
336: if (&Apache::lonnet::is_domainimage($requrl)) {
337: return OK;
338: }
339:
340:
341: my $handle = &Apache::lonnet::check_for_valid_session($r);
342:
343: my $result = &sso_login($r,$handle);
344: if (defined($result)) {
345: return $result;
346: }
347:
348:
349: if ($r->dir_config("lonBalancer") eq 'yes') {
350: $r->set_handlers('PerlResponseHandler'=>
351: [\&Apache::switchserver::handler]);
352: }
353:
354: if ($handle eq '') {
355: $r->log_reason("Cookie $handle not valid", $r->filename);
356: } elsif ($handle ne '') {
357:
358: # ------------------------------------------------------ Initialize Environment
359: my $lonidsdir=$r->dir_config('lonIDsDir');
360: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
361:
362: # --------------------------------------------------------- Initialize Language
363:
364: &Apache::lonlocal::get_language_handle($r);
365:
366: }
367:
368: # -------------------------------------------------- Should be a valid user now
369: if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') {
370: # -------------------------------------------------------------- Resource State
371:
372: if ($requrl=~/^\/+(res|uploaded)\//) {
373: $env{'request.state'} = "published";
374: } else {
375: $env{'request.state'} = 'unknown';
376: }
377: $env{'request.filename'} = $r->filename;
378: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
379: # -------------------------------------------------------- Load POST parameters
380:
381: &Apache::lonacc::get_posted_cgi($r);
382:
383: # ---------------------------------------------------------------- Check access
384: my $now = time;
385: if ($requrl !~ m{^/(?:adm|public|prtspool)/}
386: || $requrl =~ /^\/adm\/.*\/(smppg|bulletinboard)(\?|$ )/x) {
387: my $access=&Apache::lonnet::allowed('bre',$requrl);
388: if ($access eq '1') {
389: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
390: return HTTP_NOT_ACCEPTABLE;
391: }
392: if ($access eq 'A') {
393: &Apache::restrictedaccess::setup_handler($r);
394: return OK;
395: }
396: if ($access eq 'B') {
397: &Apache::blockedaccess::setup_handler($r);
398: return OK;
399: }
400: if (($access ne '2') && ($access ne 'F')) {
401: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
402: return HTTP_NOT_ACCEPTABLE;
403: }
404: }
405: if ($requrl =~ m|^/prtspool/|) {
406: my $start='/prtspool/'.$env{'user.name'}.'_'.
407: $env{'user.domain'};
408: if ($requrl !~ /^\Q$start\E/) {
409: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
410: return HTTP_NOT_ACCEPTABLE;
411: }
412: }
413: if ($requrl =~ m|^/zipspool/|) {
414: my $start='/zipspool/zipout/'.$env{'user.name'}.":".
415: $env{'user.domain'};
416: if ($requrl !~ /^\Q$start\E/) {
417: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
418: return HTTP_NOT_ACCEPTABLE;
419: }
420: }
421: if ($env{'user.name'} eq 'public' &&
422: $env{'user.domain'} eq 'public' &&
423: $requrl !~ m{^/+(res|public|uploaded)/} &&
424: $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
425: $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
426: $env{'request.querystring'}=$r->args;
427: $env{'request.firsturl'}=$requrl;
428: return FORBIDDEN;
429: }
430: # ------------------------------------------------------------- This is allowed
431: if ($env{'request.course.id'}) {
432: &Apache::lonnet::countacc($requrl);
433: $requrl=~/\.(\w+)$/;
434: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
435: ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$ )/x) ||
436: ($requrl=~/^\/adm\/wrapper\//) ||
437: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
438: ($requrl=~m|\.problem/smpedit$|) ||
439: ($requrl=~/^\/public\/.*\/syllabus$/)) {
440: # ------------------------------------- This is serious stuff, get symb and log
441: my $query=$r->args;
442: my $symb;
443: if ($query) {
444: &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
445: }
446: if ($env{'form.symb'}) {
447: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
448: if ($requrl =~ m|^/adm/wrapper/|
449: || $requrl =~ m|^/adm/coursedocs/showdoc/|) {
450: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
451: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
452: 'last_known' =>[$murl,$mid]);
453: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
454: (($requrl=~m|(.*)/smpedit$|) &&
455: &Apache::lonnet::symbverify($symb,$1))) {
456: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
457: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
458: 'last_known' =>[$murl,$mid]);
459: } else {
460: $r->log_reason('Invalid symb for '.$requrl.': '.
461: $symb);
462: $env{'user.error.msg'}=
463: "$requrl:bre:1:1:Invalid Access";
464: return HTTP_NOT_ACCEPTABLE;
465: }
466: } else {
467: $symb=&Apache::lonnet::symbread($requrl);
468: if (&Apache::lonnet::is_on_map($requrl) && $symb &&
469: !&Apache::lonnet::symbverify($symb,$requrl)) {
470: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
471: $env{'user.error.msg'}=
472: "$requrl:bre:1:1:Invalid Access";
473: return HTTP_NOT_ACCEPTABLE;
474: }
475: if ($symb) {
476: my ($map,$mid,$murl)=
477: &Apache::lonnet::decode_symb($symb);
478: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
479: 'last_known' =>[$murl,$mid]);
480: }
481: }
482: $env{'request.symb'}=$symb;
483: &Apache::lonnet::courseacclog($symb);
484: } else {
485: # ------------------------------------------------------- This is other content
486: &Apache::lonnet::courseacclog($requrl);
487: }
488: }
489: return OK;
490: }
491: # -------------------------------------------- See if this is a public resource
492: if ($requrl=~m|^/+adm/+help/+|) {
493: return OK;
494: }
495: # ------------------------------------ See if this is a viewable portfolio file
496: if (&Apache::lonnet::is_portfolio_url($requrl)) {
497: my $access=&Apache::lonnet::allowed('bre',$requrl);
498: if ($access eq 'A') {
499: &Apache::restrictedaccess::setup_handler($r);
500: return OK;
501: }
502: if (($access ne '2') && ($access ne 'F')) {
503: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
504: return HTTP_NOT_ACCEPTABLE;
505: }
506: }
507:
508: # -------------------------------------------------------------- Not authorized
509: $requrl=~/\.(\w+)$/;
510: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
511: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
512: # ($requrl=~m|^/prtspool/|)) {
513: # -------------------------- Store where they wanted to go and get login screen
514: $env{'request.querystring'}=$r->args;
515: $env{'request.firsturl'}=$requrl;
516: return FORBIDDEN;
517: # } else {
518: # --------------------------------------------------------------------- Goodbye
519: # return HTTP_BAD_REQUEST;
520: # }
521: }
522:
523: 1;
524: __END__
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