Annotation of loncom/auth/lonacc.pm, revision 1.80

1.1       albertel    1: # The LearningOnline Network
                      2: # Cookie Based Access Handler
1.22      www         3: #
1.80    ! albertel    4: # $Id: lonacc.pm,v 1.79 2006/06/16 22:37:29 raeburn Exp $
1.22      www         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: #
1.25      harris41   28: ###
1.1       albertel   29: 
                     30: package Apache::lonacc;
                     31: 
                     32: use strict;
1.8       www        33: use Apache::Constants qw(:common :http :methods);
1.2       www        34: use Apache::File;
1.6       www        35: use Apache::lonnet;
1.25      harris41   36: use Apache::loncommon();
1.47      www        37: use Apache::lonlocal;
1.1       albertel   38: use CGI::Cookie();
1.16      www        39: use Fcntl qw(:flock);
1.1       albertel   40: 
1.75      albertel   41: sub cleanup {
                     42:     my ($r)=@_;
                     43:     if (! $r->is_initial_req()) { return DECLINED; }
                     44:     &Apache::lonnet::save_cache();
                     45:     return OK;
                     46: }
                     47: 
                     48: sub goodbye {
                     49:     my ($r)=@_;
                     50:     &Apache::lonnet::goodbye();
                     51:     return DONE;
                     52: }
                     53: 
1.76      albertel   54: ###############################################
                     55: 
                     56: sub get_posted_cgi {
                     57:     my ($r) = @_;
                     58: 
                     59:     my $buffer;
                     60:     if ($r->header_in('Content-length')) {
                     61: 	$r->read($buffer,$r->header_in('Content-length'),0);
                     62:     }
                     63:     unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
                     64: 	my @pairs=split(/&/,$buffer);
                     65: 	my $pair;
                     66: 	foreach $pair (@pairs) {
                     67: 	    my ($name,$value) = split(/=/,$pair);
                     68: 	    $value =~ tr/+/ /;
                     69: 	    $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                     70: 	    $name  =~ tr/+/ /;
                     71: 	    $name  =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
1.77      albertel   72: 	    &Apache::loncommon::add_to_env("form.$name",$value);
1.76      albertel   73: 	}
                     74:     } else {
                     75: 	my $contentsep=$1;
                     76: 	my @lines = split (/\n/,$buffer);
                     77: 	my $name='';
                     78: 	my $value='';
                     79: 	my $fname='';
                     80: 	my $fmime='';
                     81: 	my $i;
                     82: 	for ($i=0;$i<=$#lines;$i++) {
                     83: 	    if ($lines[$i]=~/^$contentsep/) {
                     84: 		if ($name) {
                     85: 		    chomp($value);
                     86: 		    if ($fname) {
                     87: 			$env{"form.$name.filename"}=$fname;
                     88: 			$env{"form.$name.mimetype"}=$fmime;
                     89: 		    } else {
                     90: 			$value=~s/\s+$//s;
                     91: 		    }
1.77      albertel   92: 		    &Apache::loncommon::add_to_env("form.$name",$value);
1.76      albertel   93: 		}
                     94: 		if ($i<$#lines) {
                     95: 		    $i++;
                     96: 		    $lines[$i]=~
                     97: 		/Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
                     98: 		    $name=$1;
                     99: 		    $value='';
                    100: 		    if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
                    101: 			$fname=$1;
                    102: 			if 
                    103:                             ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
                    104: 				$fmime=$1;
                    105: 				$i++;
                    106: 			    } else {
                    107: 				$fmime='';
                    108: 			    }
                    109: 		    } else {
                    110: 			$fname='';
                    111: 			$fmime='';
                    112: 		    }
                    113: 		    $i++;
                    114: 		}
                    115: 	    } else {
                    116: 		$value.=$lines[$i]."\n";
                    117: 	    }
                    118: 	}
                    119:     }
                    120: #
                    121: # Digested POSTed values
                    122: #
                    123: # Remember the way this was originally done (GET or POST)
                    124: #
                    125:     $env{'request.method'}=$ENV{'REQUEST_METHOD'};
                    126: #
                    127: # There may also be stuff in the query string
                    128: # Tell subsequent handlers that this was GET, not POST, so they can access query string.
                    129: # Also, unset POSTed content length to cover all tracks.
                    130: #
                    131: 
                    132:     $r->method_number(M_GET);
                    133: 
                    134:     $r->method('GET');
                    135:     $r->headers_in->unset('Content-length');
                    136: }
                    137: 
1.79      raeburn   138: sub portfolio_access {
                    139:     my ($udom,$unum,$file_name,$group) = @_;
                    140:     my $current_perms = &Apache::lonnet::get_portfile_permissions($udom,$unum);
                    141:     my %access_controls = &Apache::lonnet::get_access_controls(
                    142:                                              $current_perms,$group,$file_name);
                    143:     my ($public);
                    144:     my $now = time;
                    145:     my $access_hash = $access_controls{$file_name};
                    146:     if (ref($access_hash) eq 'HASH') {
                    147:         foreach my $key (keys(%{$access_hash})) {
                    148:             my ($num,$scope,$end,$start) = ($key =~ /^([^:]+):([a-z]+)_(\d*)_?(\d*)$/);
                    149:             if ($start > $now) {
                    150:                 next;
                    151:             }
                    152:             if ($end && $end<$now) {
                    153:                 next;
                    154:             }
                    155:             if ($scope eq 'public') {
                    156:                 $public = $key;
                    157:                 last;
                    158:             }
                    159:         }
                    160:         if ($public) {
                    161:             return 'ok';
                    162:         }
                    163:     }
                    164:     return;
                    165: }
1.76      albertel  166: 
1.1       albertel  167: sub handler {
                    168:     my $r = shift;
                    169:     my $requrl=$r->uri;
                    170:     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
                    171:     my $lonid=$cookies{'lonID'};
                    172:     my $cookie;
1.70      albertel  173:     my $lonidsdir=$r->dir_config('lonIDsDir');
                    174: 
                    175:     my $handle;
1.1       albertel  176:     if ($lonid) {
1.70      albertel  177: 	$handle=$lonid->value;
1.1       albertel  178:         $handle=~s/\W//g;
1.70      albertel  179:     }
                    180:       
1.78      albertel  181:     my ($sso_login);
1.70      albertel  182:     if ($r->user 
                    183: 	&& (!$lonid || !-e "$lonidsdir/$handle.id" || $handle eq '') ) {
1.78      albertel  184: 	$sso_login = 1;
1.70      albertel  185: 	my $domain = $r->dir_config('lonDefDomain');
                    186: 	my $home=&Apache::lonnet::homeserver($r->user,$domain);
                    187: 	if ($home !~ /(con_lost|no_such_host)/) {
                    188: 	    $handle=&Apache::lonauth::success($r,$r->user,$domain,
                    189: 					     $home,'noredirect');
                    190: 	    $r->header_out('Set-cookie',"lonID=$handle; path=/");
                    191: 	}
                    192:     }
                    193: 
1.78      albertel  194:     if ($sso_login) {
                    195: 	&Apache::lonnet::appenv('request.sso.login' => 1);
                    196:     }
                    197: 
1.70      albertel  198:     if ($r->dir_config("lonBalancer") eq 'yes') {
                    199: 	$r->set_handlers('PerlResponseHandler'=>
                    200: 			 [\&Apache::switchserver::handler]);
                    201:     }
                    202: 
                    203:     if ($handle ne '') {
1.1       albertel  204:         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
1.6       www       205: 
1.46      www       206: # ------------------------------------------------------ Initialize Environment
                    207: 
                    208:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
1.47      www       209: 
                    210: # --------------------------------------------------------- Initialize Language
                    211: 
1.48      www       212: 	    &Apache::lonlocal::get_language_handle($r);
1.46      www       213: 
                    214: # -------------------------------------------------------------- Resource State
1.6       www       215: 
1.51      albertel  216:             if ($requrl=~/^\/+(res|uploaded)\//) {
1.64      albertel  217:                $env{'request.state'} = "published";
1.17      www       218: 	    } else {
1.64      albertel  219: 	       $env{'request.state'} = 'unknown';
1.17      www       220:             }
1.64      albertel  221:             $env{'request.filename'} = $r->filename;
                    222:             $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
1.6       www       223: # -------------------------------------------------------- Load POST parameters
                    224: 
1.76      albertel  225: 	    &Apache::lonacc::get_posted_cgi($r);
1.6       www       226: 
                    227: # ---------------------------------------------------------------- Check access
1.79      raeburn   228:             my $now = time;
1.80    ! albertel  229:             if ($requrl =~ m|/+uploaded/([^/]+)/([^/]+)/portfolio(/.+)$|) {
1.79      raeburn   230:                 my $result = &portfolio_access($1,$2,$3);
                    231:                 if ($result eq 'ok') {
                    232:                     return OK;
                    233:                 }
1.80    ! albertel  234:             } elsif ($requrl =~ m|/+uploaded/([^/]+)/([^/]+)/groups/([^/]+)/portfolio/(.+)$|) {
1.79      raeburn   235:                 my $result = &portfolio_access($1,$2,$4.'/'.$3,$3);
                    236:                 if ($result eq 'ok') {
                    237:                     return OK;
                    238:                 }
                    239:             }
1.37      albertel  240:             if ($requrl!~/^\/adm|public|prtspool\//) {
1.7       www       241: 		my $access=&Apache::lonnet::allowed('bre',$requrl);
                    242:                 if ($access eq '1') {
1.64      albertel  243: 		   $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
1.7       www       244: 	           return HTTP_NOT_ACCEPTABLE; 
                    245:                 }
                    246:                 if (($access ne '2') && ($access ne 'F')) {
1.64      albertel  247: 		   $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
1.7       www       248: 	           return HTTP_NOT_ACCEPTABLE; 
                    249:                 }
1.23      www       250:             }
1.37      albertel  251: 	    if ($requrl =~ m|^/prtspool/|) {
1.64      albertel  252: 		my $start='/prtspool/'.$env{'user.name'}.'_'.
                    253: 		    $env{'user.domain'};
1.37      albertel  254: 		if ($requrl !~ /^\Q$start\E/) {
1.64      albertel  255: 		    $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
1.37      albertel  256: 		    return HTTP_NOT_ACCEPTABLE;
                    257: 		}
                    258: 	    }
1.67      albertel  259: 	    if ($env{'user.name'} eq 'public' && 
                    260: 		$env{'user.domain'} eq 'public' &&
                    261: 		$requrl !~ m{^/+(res|public)/} &&
1.69      www       262: 		$requrl !~ m{^/+adm/(help|logout|randomlabel\.png)}) {
1.67      albertel  263: 		$env{'request.querystring'}=$r->args;
                    264: 		$env{'request.firsturl'}=$requrl;
                    265: 		return FORBIDDEN;
                    266: 	    }
1.23      www       267: # ------------------------------------------------------------- This is allowed
1.64      albertel  268:           if ($env{'request.course.id'}) {
1.24      www       269: 	    &Apache::lonnet::countacc($requrl);
1.23      www       270:             $requrl=~/\.(\w+)$/;
1.39      www       271:             if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
1.44      www       272:  ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$)/) ||
                    273:  ($requrl=~/^\/adm\/wrapper\//) ||
1.72      albertel  274:  ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
1.53      albertel  275:  ($requrl=~m|\.problem/smpedit$|) ||
1.39      www       276:  ($requrl=~/^\/public\/.*\/syllabus$/)) {
1.23      www       277: # ------------------------------------- This is serious stuff, get symb and log
1.29      www       278: 		my $query=$r->args;
                    279:                 my $symb;
                    280:                 if ($query) {
                    281: 		    &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
                    282:                 }
1.64      albertel  283:                 if ($env{'form.symb'}) {
                    284: 		    $symb=&Apache::lonnet::symbclean($env{'form.symb'});
1.72      albertel  285:                     if ($requrl =~ m|^/adm/wrapper/|
                    286: 			|| $requrl =~ m|^/adm/coursedocs/showdoc/|) {
1.52      raeburn   287:                         my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
1.63      albertel  288:                         &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
                    289: 						  'last_known' =>[$murl,$mid]);
1.53      albertel  290:                     } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
                    291: 			     (($requrl=~m|(.*)/smpedit$|) &&
                    292: 			      &Apache::lonnet::symbverify($symb,$1))) {
1.50      albertel  293:                       my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
1.74      albertel  294: 		      &Apache::lonnet::symblist($map,$murl => [$murl,$mid],
1.63      albertel  295: 						'last_known' =>[$murl,$mid]);
1.31      www       296: 		    } else {
                    297: 			$r->log_reason('Invalid symb for '.$requrl.': '.
                    298:                                        $symb);
1.64      albertel  299: 		        $env{'user.error.msg'}=
1.31      www       300:                                 "$requrl:bre:1:1:Invalid Access";
                    301:   	                return HTTP_NOT_ACCEPTABLE; 
                    302:                     }
1.29      www       303:                 } else {
1.44      www       304: 	            $symb=&Apache::lonnet::symbread($requrl);
1.58      albertel  305: 		    if (&Apache::lonnet::is_on_map($requrl) && $symb &&
1.56      albertel  306: 			!&Apache::lonnet::symbverify($symb,$requrl)) {
1.58      albertel  307: 			$r->log_reason('Invalid symb for '.$requrl.': '.$symb);
1.64      albertel  308: 		        $env{'user.error.msg'}=
1.55      albertel  309:                                 "$requrl:bre:1:1:Invalid Access";
                    310:   	                return HTTP_NOT_ACCEPTABLE; 
                    311: 		    }
1.61      albertel  312: 		    if ($symb) {
1.65      albertel  313: 			my ($map,$mid,$murl)=
                    314: 			    &Apache::lonnet::decode_symb($symb);
1.63      albertel  315: 			&Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
                    316: 						'last_known' =>[$murl,$mid]);
1.61      albertel  317: 		    }
1.29      www       318:                 }
1.64      albertel  319:                 $env{'request.symb'}=$symb;
1.23      www       320:                 &Apache::lonnet::courseacclog($symb);
                    321:             } else {
                    322: # ------------------------------------------------------- This is other content
                    323:                 &Apache::lonnet::courseacclog($requrl);    
                    324:             }
                    325: 	  }
1.2       www       326:             return OK; 
1.1       albertel  327:         } else { 
1.73      raeburn   328:             $r->log_reason("Cookie $handle not valid", $r->filename); 
                    329:         }
1.1       albertel  330:     }
1.6       www       331: 
1.21      www       332: # -------------------------------------------- See if this is a public resource
1.37      albertel  333:     if ($requrl=~m|^/public/|
                    334: 	|| (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
1.21      www       335:         &Apache::lonnet::logthis('Granting public access: '.$requrl);
1.71      www       336:         &Apache::lonlocal::get_language_handle($r);
1.66      albertel  337: 	my $cookie=
                    338: 	    &Apache::lonauth::success($r,'public','public','public');
                    339:         my $lonidsdir=$r->dir_config('lonIDsDir');
                    340: 	&Apache::lonnet::transfer_profile_to_env($lonidsdir,$cookie);
1.76      albertel  341: 	&Apache::lonacc::get_posted_cgi($r);
1.64      albertel  342:         $env{'request.state'} = "published";
                    343:         $env{'request.publicaccess'} = 1;
                    344:         $env{'request.filename'} = $r->filename;
1.59      albertel  345: 
1.66      albertel  346: 	$r->header_out('Set-cookie',"lonID=$cookie; path=/");
1.21      www       347:         return OK;
                    348:     }
1.68      albertel  349:     if ($requrl=~m|^/+adm/+help/+|) {
                    350: 	return OK;
                    351:     }
1.79      raeburn   352: # ------------------------------------- See if this is a viewable portfolio file
1.80    ! albertel  353:     if ($requrl =~ m|/+uploaded/([^/]+)/([^/]+)/portfolio(/.+)$|) {
1.79      raeburn   354:         my $result = &portfolio_access($1,$2,$3);
                    355:         if ($result eq 'ok') {
                    356:             return OK;
                    357:         }
1.80    ! albertel  358:     } elsif ($requrl =~ m|/+uploaded/([^/]+)/([^/]+)/groups/([^/]+)/portfolio/(.+)$|) {
1.79      raeburn   359:         my $result = &portfolio_access($1,$2,$4.'/'.$3,$3);
                    360:         if ($result eq 'ok') {
                    361:             return OK;
                    362:         }
                    363:     }
1.34      www       364: # -------------------------------------------------------------- Not authorized
                    365:     $requrl=~/\.(\w+)$/;
1.62      albertel  366: #    if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
                    367: #        ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
                    368: #        ($requrl=~m|^/prtspool/|)) {
1.34      www       369: # -------------------------- Store where they wanted to go and get login screen
1.64      albertel  370: 	$env{'request.querystring'}=$r->args;
                    371: 	$env{'request.firsturl'}=$requrl;
1.34      www       372:        return FORBIDDEN;
1.62      albertel  373: #   } else {
1.34      www       374: # --------------------------------------------------------------------- Goodbye
1.62      albertel  375: #       return HTTP_BAD_REQUEST;
                    376: #   }
1.1       albertel  377: }
                    378: 
                    379: 1;
                    380: __END__
1.25      harris41  381: 
                    382: =head1 NAME
                    383: 
                    384: Apache::lonacc - Cookie Based Access Handler
                    385: 
                    386: =head1 SYNOPSIS
                    387: 
                    388: Invoked (for various locations) by /etc/httpd/conf/srm.conf:
                    389: 
                    390:  PerlAccessHandler       Apache::lonacc
                    391: 
                    392: =head1 INTRODUCTION
                    393: 
                    394: This module enables cookie based authentication and is used
                    395: to control access for many different LON-CAPA URIs.
                    396: 
                    397: Whenever the client sends the cookie back to the server, 
                    398: this cookie is handled by either lonacc.pm or loncacc.pm
                    399: (see srm.conf for what is invoked when).  If
                    400: the cookie is missing or invalid, the user is re-challenged
                    401: for login information.
                    402: 
                    403: This is part of the LearningOnline Network with CAPA project
                    404: described at http://www.lon-capa.org.
                    405: 
                    406: =head1 HANDLER SUBROUTINE
                    407: 
                    408: This routine is called by Apache and mod_perl.
                    409: 
                    410: =over 4
                    411: 
                    412: =item *
                    413: 
                    414: transfer profile into environment
                    415: 
                    416: =item *
                    417: 
                    418: load POST parameters
                    419: 
                    420: =item *
                    421: 
                    422: check access
                    423: 
                    424: =item *
                    425: 
                    426: if allowed, get symb, log, generate course statistics if applicable
                    427: 
                    428: =item *
                    429: 
                    430: otherwise return error
                    431: 
                    432: =item *
                    433: 
                    434: see if public resource
                    435: 
                    436: =item *
                    437: 
                    438: store attempted access
                    439: 
                    440: =back
                    441: 
                    442: =cut

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