1: # The LearningOnline Network
2: # Cookie Based Access Handler
3: #
4: # $Id: lonacc.pm,v 1.190 2021/05/04 18:47:37 raeburn 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: =head1 NOTABLE SUBROUTINES
91:
92: =cut
93:
94:
95: package Apache::lonacc;
96:
97: use strict;
98: use Apache::Constants qw(:common :http :methods);
99: use Apache::File;
100: use Apache::lonnet;
101: use Apache::loncommon();
102: use Apache::lonlocal;
103: use Apache::restrictedaccess();
104: use Apache::blockedaccess();
105: use Apache::lonprotected();
106: use Fcntl qw(:flock);
107: use LONCAPA qw(:DEFAULT :match);
108:
109: sub cleanup {
110: my ($r)=@_;
111: if (! $r->is_initial_req()) { return DECLINED; }
112: &Apache::lonnet::save_cache();
113: return OK;
114: }
115:
116: sub goodbye {
117: my ($r)=@_;
118: &Apache::lonnet::goodbye();
119: return DONE;
120: }
121:
122: ###############################################
123:
124: sub get_posted_cgi {
125: my ($r,$fields) = @_;
126:
127: my $buffer;
128: if ($r->header_in('Content-length')) {
129: $r->read($buffer,$r->header_in('Content-length'),0);
130: }
131: my $content_type = $r->header_in('Content-type');
132: if ($content_type !~ m{^multipart/form-data}) {
133: my @pairs=split(/&/,$buffer);
134: my $pair;
135: foreach $pair (@pairs) {
136: my ($name,$value) = split(/=/,$pair);
137: $value =~ tr/+/ /;
138: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
139: $name =~ tr/+/ /;
140: $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
141: if (ref($fields) eq 'ARRAY') {
142: next if (!grep(/^\Q$name\E$/,@{$fields}));
143: }
144: &Apache::loncommon::add_to_env("form.$name",$value);
145: }
146: } else {
147: my ($contentsep) = ($content_type =~ /boundary=\"?([^\";,]+)\"?/);
148: my @lines = split (/\n/,$buffer);
149: my $name='';
150: my $value='';
151: my $fname='';
152: my $fmime='';
153: my $i;
154: for ($i=0;$i<=$#lines;$i++) {
155: if ($lines[$i]=~/^--\Q$contentsep\E/) {
156: if ($name) {
157: chomp($value);
158: if (($r->uri eq '/adm/portfolio') &&
159: ($name eq 'uploaddoc')) {
160: if (length($value) == 1) {
161: $value=~s/[\r\n]$//;
162: }
163: } elsif ($fname =~ /\.(xls|doc|ppt)(x|m)$/i) {
164: $value=~s/[\r\n]$//;
165: }
166: if (ref($fields) eq 'ARRAY') {
167: next if (!grep(/^\Q$name\E$/,@{$fields}));
168: }
169: if ($fname) {
170: if ($env{'form.symb'} ne '') {
171: my $size = (length($value))/(1024.0 * 1024.0);
172: if (&upload_size_allowed($name,$size,$fname) eq 'ok') {
173: $env{"form.$name.filename"}=$fname;
174: $env{"form.$name.mimetype"}=$fmime;
175: &Apache::loncommon::add_to_env("form.$name",$value);
176: }
177: } else {
178: $env{"form.$name.filename"}=$fname;
179: $env{"form.$name.mimetype"}=$fmime;
180: &Apache::loncommon::add_to_env("form.$name",$value);
181: }
182: } else {
183: $value=~s/\s+$//s;
184: &Apache::loncommon::add_to_env("form.$name",$value);
185: }
186: }
187: if ($i<$#lines) {
188: $i++;
189: $lines[$i]=~
190: /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
191: $name=$1;
192: $value='';
193: if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
194: $fname=$1;
195: if
196: ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
197: $fmime=$1;
198: $i++;
199: } else {
200: $fmime='';
201: }
202: } else {
203: $fname='';
204: $fmime='';
205: }
206: if ($i<$#lines && $lines[$i+1]=~/^Content\-Type\:\s*([\w\-\/]+)/i) {
207: # TODO: something with $1 !
208: $i++;
209: }
210: if ($i<$#lines && $lines[$i+1]=~/^Content\-transfer\-encoding\:\s*([\w\-\/]+)/i) {
211: # TODO: something with $1 !
212: $i++;
213: }
214: $i++;
215: }
216: } else {
217: $value.=$lines[$i]."\n";
218: }
219: }
220: }
221: #
222: # Digested POSTed values
223: #
224: # Remember the way this was originally done (GET or POST)
225: #
226: $env{'request.method'}=$ENV{'REQUEST_METHOD'};
227: #
228: # There may also be stuff in the query string
229: # Tell subsequent handlers that this was GET, not POST, so they can access query string.
230: # Also, unset POSTed content length to cover all tracks.
231: #
232:
233: $r->method_number(M_GET);
234:
235: $r->method('GET');
236: $r->headers_in->unset('Content-length');
237: }
238:
239: =pod
240:
241: =over
242:
243: =item upload_size_allowed()
244:
245: Perform size checks for file uploads to essayresponse items in course context.
246:
247: Add form.HWFILESIZE.$part_$id to %env with file size (MB)
248: If file exceeds maximum allowed size, add form.HWFILETOOBIG.$part_$id to %env.
249:
250: =cut
251:
252: sub upload_size_allowed {
253: my ($name,$size,$fname) = @_;
254: if ($name =~ /^HWFILE(\w+)$/) {
255: my $ident = $1;
256: my $item = 'HWFILESIZE'.$ident;
257: my $savesize = sprintf("%.6f",$size);
258: &Apache::loncommon::add_to_env("form.$item",$savesize);
259: my $maxsize= &Apache::lonnet::EXT("resource.$ident.maxfilesize");
260: if (!$maxsize) {
261: $maxsize = 10.0; # FIXME This should become a domain configuration.
262: }
263: if ($size > $maxsize) {
264: my $warn = 'HWFILETOOBIG'.$ident;
265: &Apache::loncommon::add_to_env("form.$warn",$fname);
266: return;
267: }
268: }
269: return 'ok';
270: }
271:
272: =pod
273:
274: =item sso_login()
275:
276: handle the case of the single sign on user, at this point $r->user
277: will be set and valid; now need to find the loncapa user info, and possibly
278: balance them. If $r->user() is set this means either it was either set by
279: SSO or by checkauthen.pm, if a valid cookie was found. The latter case can
280: be identified by the third arg ($usename), except when lonacc is called in
281: an internal redirect to /adm/switchserver (e.g., load-balancing following
282: successful authentication) -- no cookie set yet. For that particular case
283: simply skip the call to sso_login().
284:
285: returns OK if it was SSO and user was handled.
286: returns undef if not SSO or no means to handle the user.
287:
288: =cut
289:
290: sub sso_login {
291: my ($r,$handle,$username) = @_;
292:
293: if (($r->user eq '') || ($username ne '') || ($r->user eq 'public:public') ||
294: (defined($env{'user.name'}) && (defined($env{'user.domain'}))
295: && ($handle ne ''))) {
296: # not an SSO case or already logged in
297: return undef;
298: }
299:
300: my ($user) = ($r->user =~ m/^($match_username)$/);
301: if ($user eq '') {
302: return undef;
303: }
304:
305: my $query = $r->args;
306: my %form;
307: if ($query) {
308: my @items = ('role','symb','iptoken');
309: &Apache::loncommon::get_unprocessed_cgi($query,\@items);
310: foreach my $item (@items) {
311: if (defined($env{'form.'.$item})) {
312: $form{$item} = $env{'form.'.$item};
313: }
314: }
315: }
316:
317: my %sessiondata;
318: if ($form{'iptoken'}) {
319: %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
320: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
321: unless ($sessiondata{'sessionserver'}) {
322: delete($form{'iptoken'});
323: }
324: }
325:
326: my $domain = $r->dir_config('lonSSOUserDomain');
327: if ($domain eq '') {
328: $domain = $r->dir_config('lonDefDomain');
329: }
330: my $home=&Apache::lonnet::homeserver($user,$domain);
331: if ($home !~ /(con_lost|no_host|no_such_host)/) {
332: &Apache::lonnet::logthis(" SSO authorized user $user ");
333: my ($is_balancer,$otherserver,$hosthere);
334: if ($form{'iptoken'}) {
335: if (($sessiondata{'domain'} eq $domain) &&
336: ($sessiondata{'username'} eq $user)) {
337: $hosthere = 1;
338: }
339: }
340: unless ($hosthere) {
341: ($is_balancer,$otherserver) =
342: &Apache::lonnet::check_loadbalancing($user,$domain,'login');
343: if ($is_balancer) {
344: # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
345: my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
346: if (($found_server) && ($balancer_cookie =~ /^\Q$domain\E_\Q$user\E_/)) {
347: $otherserver = $found_server;
348: } elsif ($otherserver eq '') {
349: my $lowest_load;
350: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($domain);
351: if ($lowest_load > 100) {
352: $otherserver = &Apache::lonnet::spareserver($r,$lowest_load,$lowest_load,1,$domain);
353: }
354: if ($otherserver ne '') {
355: my @hosts = &Apache::lonnet::current_machine_ids();
356: if (grep(/^\Q$otherserver\E$/,@hosts)) {
357: $hosthere = $otherserver;
358: }
359: }
360: }
361: }
362: }
363: if (($is_balancer) && (!$hosthere)) {
364: # login but immediately go to switch server to find us a new
365: # machine
366: &Apache::lonauth::success($r,$user,$domain,$home,'noredirect');
367: foreach my $item (keys(%form)) {
368: $env{'form.'.$item} = $form{$item};
369: }
370: unless ($form{'symb'}) {
371: unless (($r->uri eq '/adm/roles') || ($r->uri eq '/adm/sso')) {
372: $env{'form.origurl'} = $r->uri;
373: }
374: }
375: $env{'request.sso.login'} = 1;
376: if (defined($r->dir_config("lonSSOReloginServer"))) {
377: $env{'request.sso.reloginserver'} =
378: $r->dir_config('lonSSOReloginServer');
379: }
380: my $redirecturl = '/adm/switchserver';
381: if ($otherserver ne '') {
382: $redirecturl .= '?otherserver='.$otherserver;
383: }
384: $r->internal_redirect($redirecturl);
385: $r->set_handlers('PerlHandler'=> undef);
386: } else {
387: # need to login them in, so generate the need data that
388: # migrate expects to do login
389: my $ip = &Apache::lonnet::get_requestor_ip($r);
390: my %info=('ip' => $ip,
391: 'domain' => $domain,
392: 'username' => $user,
393: 'server' => $r->dir_config('lonHostID'),
394: 'sso.login' => 1
395: );
396: foreach my $item ('role','symb','iptoken') {
397: if (exists($form{$item})) {
398: $info{$item} = $form{$item};
399: }
400: }
401: unless ($info{'symb'}) {
402: unless (($r->uri eq '/adm/roles') || ($r->uri eq '/adm/sso')) {
403: $info{'origurl'} = $r->uri;
404: }
405: }
406: if ($r->dir_config("ssodirecturl") == 1) {
407: $info{'origurl'} = $r->uri;
408: }
409: if (defined($r->dir_config("lonSSOReloginServer"))) {
410: $info{'sso.reloginserver'} =
411: $r->dir_config('lonSSOReloginServer');
412: }
413: if (($is_balancer) && ($hosthere)) {
414: $info{'noloadbalance'} = $hosthere;
415: }
416: my $token =
417: &Apache::lonnet::tmpput(\%info,
418: $r->dir_config('lonHostID'));
419: $env{'form.token'} = $token;
420: $r->internal_redirect('/adm/migrateuser');
421: $r->set_handlers('PerlHandler'=> undef);
422: }
423: return OK;
424: } else {
425: &Apache::lonnet::logthis(" SSO authorized unknown user $user ");
426: my @cancreate;
427: my %domconfig =
428: &Apache::lonnet::get_dom('configuration',['usercreation'],$domain);
429: if (ref($domconfig{'usercreation'}) eq 'HASH') {
430: if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {
431: if (ref($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}) eq 'ARRAY') {
432: @cancreate = @{$domconfig{'usercreation'}{'cancreate'}{'selfcreate'}};
433: } elsif (($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') &&
434: ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne '')) {
435: @cancreate = ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'});
436: }
437: }
438: }
439: if ((grep(/^sso$/,@cancreate)) || (defined($r->dir_config('lonSSOUserUnknownRedirect')))) {
440: $r->subprocess_env->set('SSOUserUnknown' => $user);
441: $r->subprocess_env->set('SSOUserDomain' => $domain);
442: if (grep(/^sso$/,@cancreate)) {
443: $r->set_handlers('PerlHandler'=> [\&Apache::createaccount::handler]);
444: $r->handler('perl-script');
445: } else {
446: $r->internal_redirect($r->dir_config('lonSSOUserUnknownRedirect'));
447: $r->set_handlers('PerlHandler'=> undef);
448: }
449: return OK;
450: }
451: }
452: return undef;
453: }
454:
455: sub handler {
456: my $r = shift;
457: my $requrl=$r->uri;
458:
459: if ($requrl =~ m{^/res/adm/pages/[^/]+\.(gif|png)$}) {
460: return OK;
461: }
462:
463: if (&Apache::lonnet::is_domainimage($requrl)) {
464: return OK;
465: }
466:
467: my %user;
468: my $handle = &Apache::lonnet::check_for_valid_session($r,undef,\%user);
469:
470: unless (($requrl eq '/adm/switchserver') && (!$r->is_initial_req())) {
471: my $result = &sso_login($r,$handle,$user{'name'});
472: if (defined($result)) {
473: return $result;
474: }
475: }
476:
477: my ($is_balancer,$otherserver);
478:
479: if ($handle eq '') {
480: unless ((($requrl eq '/adm/switchserver') && (!$r->is_initial_req())) ||
481: ($requrl =~ m{^/public/$match_domain/$match_courseid/syllabus}) ||
482: ($requrl =~ m{^/adm/help/}) ||
483: ($requrl =~ m{^/res/$match_domain/$match_username/})) {
484: $r->log_reason("Cookie not valid", $r->filename);
485: }
486: } elsif ($handle ne '') {
487:
488: # ------------------------------------------------------ Initialize Environment
489: my $lonidsdir=$r->dir_config('lonIDsDir');
490: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
491:
492: # --------------------------------------------------------- Initialize Language
493:
494: &Apache::lonlocal::get_language_handle($r);
495:
496: }
497:
498: # -------------------------------------------------- Should be a valid user now
499: if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') {
500: # -------------------------------------------------------------- Resource State
501:
502: my ($cdom,$cnum);
503: if ($env{'request.course.id'}) {
504: $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
505: $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
506: }
507: if ($requrl=~/^\/+(res|uploaded)\//) {
508: $env{'request.state'} = "published";
509: } else {
510: $env{'request.state'} = 'unknown';
511: }
512: $env{'request.filename'} = $r->filename;
513: $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
514: my ($suppext,$checkabsolute);
515: if ($requrl =~ m{^/adm/wrapper/ext/}) {
516: my $query = $r->args;
517: if ($query) {
518: my $preserved;
519: foreach my $pair (split(/&/,$query)) {
520: my ($name, $value) = split(/=/,$pair);
521: unless (($name eq 'symb') || ($name eq 'usehttp')) {
522: $preserved .= $pair.'&';
523: }
524: if (($env{'request.course.id'}) && ($name eq 'folderpath')) {
525: if ($value =~ /^supplemental/) {
526: $suppext = 1;
527: }
528: }
529: }
530: $preserved =~ s/\&$//;
531: if ($preserved) {
532: $env{'request.external.querystring'} = $preserved;
533: }
534: }
535: if ($env{'request.course.id'}) {
536: $checkabsolute = 1;
537: }
538: } elsif ($env{'request.course.id'} &&
539: (($requrl =~ m{^/adm/$match_domain/$match_username/aboutme$}) ||
540: ($requrl eq "/public/$cdom/$cnum/syllabus") ||
541: ($requrl =~ m{^/adm/$cdom/$cnum/\d+/ext\.tool$}))) {
542: my $query = $r->args;
543: if ($query) {
544: foreach my $pair (split(/&/,$query)) {
545: my ($name, $value) = split(/=/,$pair);
546: if ($name eq 'folderpath') {
547: if ($value =~ /^supplemental/) {
548: $suppext = 1;
549: }
550: last;
551: }
552: }
553: }
554: if ($requrl =~ m{^/public/$cdom/$cnum/syllabus$}) {
555: $checkabsolute = 1;
556: }
557: }
558: if ($checkabsolute) {
559: my $hostname = $r->hostname();
560: my $lonhost = &Apache::lonnet::host_from_dns($hostname);
561: if ($lonhost) {
562: my $actual = &Apache::lonnet::absolute_url($hostname,1,1);
563: my $exphostname = &Apache::lonnet::hostname($lonhost);
564: my $expected = $Apache::lonnet::protocol{$lonhost}.'://'.$hostname;
565: unless ($actual eq $expected) {
566: $env{'request.use_absolute'} = $expected;
567: }
568: }
569: }
570: # -------------------------------------------------------- Load POST parameters
571:
572: &Apache::lonacc::get_posted_cgi($r);
573:
574: # ------------------------------------------------------ Check if load balancer
575:
576: my $checkexempt;
577: if ($env{'user.loadbalexempt'} eq $r->dir_config('lonHostID')) {
578: if ($env{'user.loadbalcheck.time'} + 600 > time) {
579: $checkexempt = 1;
580: }
581: }
582: if ($env{'user.noloadbalance'} eq $r->dir_config('lonHostID')) {
583: $checkexempt = 1;
584: }
585: unless (($checkexempt) || (($requrl eq '/adm/switchserver') && (!$r->is_initial_req()))) {
586: ($is_balancer,$otherserver) =
587: &Apache::lonnet::check_loadbalancing($env{'user.name'},
588: $env{'user.domain'});
589: if ($is_balancer) {
590: # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
591: my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
592: if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
593: $otherserver = $found_server;
594: }
595: unless ($requrl eq '/adm/switchserver') {
596: $r->set_handlers('PerlResponseHandler'=>
597: [\&Apache::switchserver::handler]);
598: }
599: if ($otherserver ne '') {
600: $env{'form.otherserver'} = $otherserver;
601: }
602: unless (($env{'form.origurl'}) || ($r->uri eq '/adm/roles') ||
603: ($r->uri eq '/adm/switchserver') || ($r->uri eq '/adm/sso')) {
604: $env{'form.origurl'} = $r->uri;
605: }
606: }
607: }
608: if ($requrl=~m{^/+tiny/+$match_domain/+\w+$}) {
609: if ($env{'user.name'} eq 'public' &&
610: $env{'user.domain'} eq 'public') {
611: $env{'request.firsturl'}=$requrl;
612: return FORBIDDEN;
613: } else {
614: return OK;
615: }
616: }
617: # ---------------------------------------------------------------- Check access
618: my $now = time;
619: my ($check_symb,$check_access,$check_block,$access,$poss_symb);
620: if ($requrl !~ m{^/(?:adm|public|(?:prt|zip)spool)/}
621: || $requrl =~ /^\/adm\/.*\/(smppg|bulletinboard)(\?|$ )/x) {
622: $check_access = 1;
623: }
624: if ((!$check_access) && ($env{'request.course.id'})) {
625: if (($requrl eq '/adm/viewclasslist') ||
626: ($requrl =~ m{^(/adm/wrapper|)\Q/uploaded/$cdom/$cnum/docs/\E}) ||
627: ($requrl =~ m{^/adm/.*/aboutme$}) ||
628: ($requrl=~m{^/adm/coursedocs/showdoc/}) ||
629: ($requrl=~m{^(/adm/wrapper|)/adm/$cdom/$cnum/\d+/ext\.tool$})) {
630: $check_block = 1;
631: }
632: }
633: if (($env{'request.course.id'}) && (!$suppext)) {
634: $requrl=~/\.(\w+)$/;
635: if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
636: ($requrl=~/^\/adm\/.*\/(aboutme|smppg|bulletinboard)(\?|$ )/x) ||
637: ($requrl=~/^\/adm\/wrapper\//) ||
638: ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
639: ($requrl=~m|\.problem/smpedit$|) ||
640: ($requrl=~/^\/public\/.*\/syllabus$/) ||
641: ($requrl=~/^\/adm\/(viewclasslist|navmaps)$/) ||
642: ($requrl=~/^\/adm\/.*\/aboutme\/portfolio(\?|$)/) ||
643: ($requrl=~m{^/adm/$cdom/$cnum/\d+/ext\.tool$})) {
644: $check_symb = 1;
645: }
646: }
647: if (($check_access) || ($check_block)) {
648: if ($check_symb) {
649: if ($env{'form.symb'}) {
650: $poss_symb=&Apache::lonnet::symbclean($env{'form.symb'});
651: } elsif (($env{'request.course.id'}) && ($r->args ne '')) {
652: my $query = $r->args;
653: foreach my $pair (split(/&/,$query)) {
654: my ($name, $value) = split(/=/,$pair);
655: $name = &unescape($name);
656: $value =~ tr/+/ /;
657: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
658: if ($name eq 'symb') {
659: $poss_symb = &Apache::lonnet::symbclean($value);
660: last;
661: }
662: }
663: }
664: if ($poss_symb) {
665: my ($possmap,$resid,$url)=&Apache::lonnet::decode_symb($poss_symb);
666: $url = &Apache::lonnet::clutter($url);
667: my $toplevelmap = $env{'course.'.$env{'request.course.id'}.'.url'};
668: unless (($url eq $requrl) && (($possmap eq $toplevelmap) ||
669: (&Apache::lonnet::is_on_map($possmap)))) {
670: undef($poss_symb);
671: }
672: if ($poss_symb) {
673: if ((!$env{'request.role.adv'}) && ($env{'acc.randomout'}) &&
674: ($env{'acc.randomout'}=~/\&\Q$poss_symb\E\&/)) {
675: undef($poss_symb);
676: }
677: }
678: }
679: if ($poss_symb) {
680: $access=&Apache::lonnet::allowed('bre',$requrl,$poss_symb);
681: } else {
682: $access=&Apache::lonnet::allowed('bre',$requrl,'','','','',1);
683: }
684: } else {
685: $access=&Apache::lonnet::allowed('bre',$requrl);
686: }
687: }
688: if ($check_block) {
689: if ($access eq 'B') {
690: if ($poss_symb) {
691: if (&Apache::lonnet::symbverify($poss_symb,$requrl)) {
692: $env{'request.symb'} = $poss_symb;
693: }
694: }
695: &Apache::blockedaccess::setup_handler($r);
696: return OK;
697: }
698: } elsif ($check_access) {
699: if ($handle eq '') {
700: unless ($access eq 'F') {
701: if ($requrl =~ m{^/res/$match_domain/$match_username/}) {
702: $r->log_reason("Cookie not valid", $r->filename);
703: }
704: }
705: }
706: if ($access eq '1') {
707: $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
708: return HTTP_NOT_ACCEPTABLE;
709: }
710: if ($access eq 'A') {
711: &Apache::restrictedaccess::setup_handler($r);
712: return OK;
713: }
714: if ($access eq 'B') {
715: if ($poss_symb) {
716: if (&Apache::lonnet::symbverify($poss_symb,$requrl)) {
717: $env{'request.symb'} = $poss_symb;
718: }
719: }
720: &Apache::blockedaccess::setup_handler($r);
721: return OK;
722: }
723: if ($access eq 'D') {
724: &Apache::lonprotected::setup_handler($r);
725: return OK;
726: }
727: if (($access ne '2') && ($access ne 'F')) {
728: if ($requrl =~ m{^/res/}) {
729: $access = &Apache::lonnet::allowed('bro',$requrl);
730: if ($access ne 'F') {
731: if ($requrl eq '/res/lib/templates/simpleproblem.problem/smpedit') {
732: $access = &Apache::lonnet::allowed('bre','/res/lib/templates/simpleproblem.problem');
733: if ($access ne 'F') {
734: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
735: return HTTP_NOT_ACCEPTABLE;
736: }
737: } else {
738: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
739: return HTTP_NOT_ACCEPTABLE;
740: }
741: }
742: } elsif (($handle =~ /^publicuser_\d+$/) && (&Apache::lonnet::is_portfolio_url($requrl))) {
743: my $clientip = &Apache::lonnet::get_requestor_ip($r);
744: if (&Apache::lonnet::allowed('bre',$requrl,undef,undef,$clientip) ne 'F') {
745: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
746: return HTTP_NOT_ACCEPTABLE;
747: }
748: } else {
749: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
750: return HTTP_NOT_ACCEPTABLE;
751: }
752: }
753: }
754: if ($requrl =~ m|^/prtspool/|) {
755: my $start='/prtspool/'.$env{'user.name'}.'_'.
756: $env{'user.domain'};
757: if ($requrl !~ /^\Q$start\E/) {
758: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
759: return HTTP_NOT_ACCEPTABLE;
760: }
761: }
762: if ($requrl =~ m|^/zipspool/|) {
763: my $start='/zipspool/zipout/'.$env{'user.name'}.":".
764: $env{'user.domain'};
765: if ($requrl !~ /^\Q$start\E/) {
766: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
767: return HTTP_NOT_ACCEPTABLE;
768: }
769: }
770: if ($env{'user.name'} eq 'public' &&
771: $env{'user.domain'} eq 'public' &&
772: $requrl !~ m{^/+(res|public|uploaded)/} &&
773: $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
774: $requrl !~ m{^/adm/blockingstatus/.*$} &&
775: $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
776: $env{'request.querystring'}=$r->args;
777: $env{'request.firsturl'}=$requrl;
778: return FORBIDDEN;
779: }
780: # ------------------------------------------------------------- This is allowed
781: if ($env{'request.course.id'}) {
782: &Apache::lonnet::countacc($requrl);
783: my $query=$r->args;
784: if ($check_symb) {
785: # ------------------------------------- This is serious stuff, get symb and log
786: my $symb;
787: if ($query) {
788: &Apache::loncommon::get_unprocessed_cgi($query,['symb','folderpath']);
789: }
790: if ($env{'form.symb'}) {
791: $symb=&Apache::lonnet::symbclean($env{'form.symb'});
792: if (($requrl eq '/adm/navmaps') ||
793: ($requrl =~ m{^/adm/wrapper/}) ||
794: ($requrl =~ m{^/adm/coursedocs/showdoc/})) {
795: unless (&Apache::lonnet::symbverify($symb,$requrl)) {
796: if (&Apache::lonnet::is_on_map($requrl)) {
797: $symb = &Apache::lonnet::symbread($requrl);
798: unless (&Apache::lonnet::symbverify($symb,$requrl)) {
799: undef($symb);
800: }
801: }
802: }
803: if ($symb) {
804: if ($requrl eq '/adm/navmaps') {
805: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
806: &Apache::lonnet::symblist($map,$murl => [$murl,$mid]);
807: } elsif (($requrl =~ m{^/adm/wrapper/}) ||
808: ($requrl =~ m{^/adm/coursedocs/showdoc/})) {
809: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
810: if ($map =~ /\.page$/) {
811: my $mapsymb = &Apache::lonnet::symbread($map);
812: ($map,$mid,$murl)=&Apache::lonnet::decode_symb($mapsymb);
813: }
814: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
815: 'last_known' =>[$murl,$mid]);
816: }
817: }
818: } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
819: (($requrl=~m|(.*)/smpedit$|) &&
820: &Apache::lonnet::symbverify($symb,$1)) ||
821: (($requrl=~m|(.*/aboutme)/portfolio$|) &&
822: &Apache::lonnet::symbverify($symb,$1))) {
823: my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
824: if (($map =~ /\.page$/) && ($requrl !~ /\.page$/)) {
825: my $mapsymb = &Apache::lonnet::symbread($map);
826: ($map,$mid,$murl)=&Apache::lonnet::decode_symb($mapsymb);
827: }
828: &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
829: 'last_known' =>[$murl,$mid]);
830: } else {
831: $r->log_reason('Invalid symb for '.$requrl.': '.
832: $symb);
833: $env{'user.error.msg'}=
834: "$requrl:bre:1:1:Invalid Access";
835: return HTTP_NOT_ACCEPTABLE;
836: }
837: } else {
838: if ($requrl=~m{^(/adm/.*/aboutme)/portfolio$}) {
839: $requrl = $1;
840: }
841: $symb=&Apache::lonnet::symbread($requrl);
842: if (&Apache::lonnet::is_on_map($requrl) && $symb) {
843: my ($encstate,$invalidsymb);
844: unless (&Apache::lonnet::symbverify($symb,$requrl,\$encstate)) {
845: $invalidsymb = 1;
846: #
847: # If $env{'request.enc'} inconsistent with encryption expected for $symb
848: # retrieved by lonnet::symbread(), call again to check for an instance of
849: # $requrl in the course for which expected encryption matches request.enc.
850: # If symb for different instance passes lonnet::symbverify(), use that as
851: # the symb for $requrl and call &Apache::lonnet::allowed() for that symb.
852: # Report invalid symb if there is no other symb. Redirect to /adm/ambiguous
853: # if multiple possible symbs consistent with request.enc available for $requrl.
854: #
855: if (($env{'request.enc'} && !$encstate) || (!$env{'request.enc'} && $encstate)) {
856: my %possibles;
857: my $nocache = 1;
858: my $oldsymb = $symb;
859: $symb = &Apache::lonnet::symbread($requrl,'','','',\%possibles,$nocache);
860: if (($symb) && ($symb ne $oldsymb)) {
861: if (&Apache::lonnet::symbverify($symb,$requrl)) {
862: my $access=&Apache::lonnet::allowed('bre',$requrl,$symb);
863: if ($access eq 'B') {
864: $env{'request.symb'} = $symb;
865: &Apache::blockedaccess::setup_handler($r);
866: return OK;
867: } elsif (($access eq '2') || ($access eq 'F')) {
868: $invalidsymb = '';
869: }
870: }
871: } elsif (keys(%possibles) > 1) {
872: $r->internal_redirect('/adm/ambiguous');
873: return OK;
874: }
875: }
876: if ($invalidsymb) {
877: if ($requrl eq '/adm/navmaps') {
878: undef($symb);
879: } else {
880: $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
881: $env{'user.error.msg'}=
882: "$requrl:bre:1:1:Invalid Access";
883: return HTTP_NOT_ACCEPTABLE;
884: }
885: }
886: }
887: }
888: if ($symb) {
889: my ($map,$mid,$murl)=
890: &Apache::lonnet::decode_symb($symb);
891: if ($requrl eq '/adm/navmaps') {
892: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid]);
893: } else {
894: if (($map =~ /\.page$/) && ($requrl !~ /\.page$/)) {
895: my $mapsymb = &Apache::lonnet::symbread($map);
896: ($map,$mid,$murl)=&Apache::lonnet::decode_symb($mapsymb);
897: }
898: &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
899: 'last_known' =>[$murl,$mid]);
900: }
901: }
902: }
903: $env{'request.symb'}=$symb;
904: if (($env{'request.symbread.cached.'}) && ($env{'request.symbread.cached.'} ne $symb)) {
905: $env{'request.symbread.cached.'} = $symb;
906: }
907: &Apache::lonnet::courseacclog($symb);
908: } else {
909: # ------------------------------------------------------- This is other content
910: &Apache::lonnet::courseacclog($requrl);
911: }
912: if ($requrl =~ m{^/+uploaded/\Q$cdom\E/\Q$cnum\E/(docs|supplemental)/.+\.html?$}) {
913: if (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) {
914: if ($query) {
915: &Apache::loncommon::get_unprocessed_cgi($query,['forceedit']);
916: if ($env{'form.forceedit'}) {
917: $env{'request.state'} = 'edit';
918: }
919: }
920: }
921: } elsif ($requrl =~ m{^/+uploaded/\Q$cdom\E/\Q$cnum\E/portfolio/syllabus/.+\.html?$}) {
922: if (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) {
923: if ($query) {
924: &Apache::loncommon::get_unprocessed_cgi($query,['forceedit','editmode']);
925: if (($env{'form.forceedit'}) || ($env{'form.editmode'})) {
926: $env{'request.state'} = 'edit';
927: }
928: }
929: }
930: }
931: }
932: return OK;
933: } else {
934: my $defdom=$r->dir_config('lonDefDomain');
935: ($is_balancer,$otherserver) =
936: &Apache::lonnet::check_loadbalancing(undef,$defdom);
937: if ($is_balancer) {
938: $r->set_handlers('PerlResponseHandler'=>
939: [\&Apache::switchserver::handler]);
940: if ($otherserver ne '') {
941: $env{'form.otherserver'} = $otherserver;
942: }
943: }
944: }
945: # -------------------------------------------- See if this is a public resource
946: if ($requrl=~m|^/+adm/+help/+|) {
947: return OK;
948: }
949: # ------------------------------------ See if this is a viewable portfolio file
950: if (&Apache::lonnet::is_portfolio_url($requrl)) {
951: my $clientip = &Apache::lonnet::get_requestor_ip($r);
952: my $access=&Apache::lonnet::allowed('bre',$requrl,undef,undef,$clientip);
953: if ($access eq 'A') {
954: &Apache::restrictedaccess::setup_handler($r);
955: return OK;
956: }
957: if (($access ne '2') && ($access ne 'F')) {
958: $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
959: return HTTP_NOT_ACCEPTABLE;
960: }
961: }
962:
963: # -------------------------------------------------------------- Not authorized
964: $requrl=~/\.(\w+)$/;
965: # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
966: # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
967: # ($requrl=~m|^/prtspool/|)) {
968: # -------------------------- Store where they wanted to go and get login screen
969: $env{'request.querystring'}=$r->args;
970: $env{'request.firsturl'}=$requrl;
971: return FORBIDDEN;
972: # } else {
973: # --------------------------------------------------------------------- Goodbye
974: # return HTTP_BAD_REQUEST;
975: # }
976: }
977:
978: 1;
979: __END__
980:
981: =pod
982:
983: =back
984:
985: =cut
986:
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