--- loncom/auth/lonacc.pm 2007/11/06 02:42:40 1.113 +++ loncom/auth/lonacc.pm 2016/08/05 20:27:18 1.159.2.2 @@ -1,7 +1,7 @@ # The LearningOnline Network # Cookie Based Access Handler # -# $Id: lonacc.pm,v 1.113 2007/11/06 02:42:40 albertel Exp $ +# $Id: lonacc.pm,v 1.159.2.2 2016/08/05 20:27:18 raeburn Exp $ # # Copyright Michigan State University Board of Trustees # @@ -27,6 +27,71 @@ # ### +=head1 NAME + +Apache::lonacc - Cookie Based Access Handler + +=head1 SYNOPSIS + +Invoked (for various locations) by /etc/httpd/conf/srm.conf: + + PerlAccessHandler Apache::lonacc + +=head1 INTRODUCTION + +This module enables cookie based authentication and is used +to control access for many different LON-CAPA URIs. + +Whenever the client sends the cookie back to the server, +this cookie is handled by either lonacc.pm or loncacc.pm +(see srm.conf for what is invoked when). If +the cookie is missing or invalid, the user is re-challenged +for login information. + +This is part of the LearningOnline Network with CAPA project +described at http://www.lon-capa.org. + +=head1 HANDLER SUBROUTINE + +This routine is called by Apache and mod_perl. + +=over 4 + +=item * + +transfer profile into environment + +=item * + +load POST parameters + +=item * + +check access + +=item * + +if allowed, get symb, log, generate course statistics if applicable + +=item * + +otherwise return error + +=item * + +see if public resource + +=item * + +store attempted access + +=back + +=head1 NOTABLE SUBROUTINES + +=cut + + package Apache::lonacc; use strict; @@ -36,15 +101,14 @@ use Apache::lonnet; use Apache::loncommon(); use Apache::lonlocal; use Apache::restrictedaccess(); -use Apache::blockedaccess(); +use Apache::blockedaccess(); use Fcntl qw(:flock); -use LONCAPA; +use LONCAPA qw(:DEFAULT :match); sub cleanup { my ($r)=@_; if (! $r->is_initial_req()) { return DECLINED; } &Apache::lonnet::save_cache(); - &Apache::lontexconvert::jsMath_reset(); return OK; } @@ -57,7 +121,7 @@ sub goodbye { ############################################### sub get_posted_cgi { - my ($r) = @_; + my ($r,$fields) = @_; my $buffer; if ($r->header_in('Content-length')) { @@ -73,6 +137,9 @@ sub get_posted_cgi { $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; $name =~ tr/+/ /; $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; + if (ref($fields) eq 'ARRAY') { + next if (!grep(/^\Q$name\E$/,@{$fields})); + } &Apache::loncommon::add_to_env("form.$name",$value); } } else { @@ -86,14 +153,35 @@ sub get_posted_cgi { for ($i=0;$i<=$#lines;$i++) { if ($lines[$i]=~/^--\Q$contentsep\E/) { if ($name) { - chomp($value); - if ($fname) { - $env{"form.$name.filename"}=$fname; - $env{"form.$name.mimetype"}=$fmime; - } else { - $value=~s/\s+$//s; - } - &Apache::loncommon::add_to_env("form.$name",$value); + chomp($value); + if (($r->uri eq '/adm/portfolio') && + ($name eq 'uploaddoc')) { + if (length($value) == 1) { + $value=~s/[\r\n]$//; + } + } elsif ($fname =~ /\.(xls|doc|ppt)x$/i) { + $value=~s/[\r\n]$//; + } + if (ref($fields) eq 'ARRAY') { + next if (!grep(/^\Q$name\E$/,@{$fields})); + } + if ($fname) { + if ($env{'form.symb'} ne '') { + my $size = (length($value))/(1024.0 * 1024.0); + if (&upload_size_allowed($name,$size,$fname) eq 'ok') { + $env{"form.$name.filename"}=$fname; + $env{"form.$name.mimetype"}=$fmime; + &Apache::loncommon::add_to_env("form.$name",$value); + } + } else { + $env{"form.$name.filename"}=$fname; + $env{"form.$name.mimetype"}=$fmime; + &Apache::loncommon::add_to_env("form.$name",$value); + } + } else { + $value=~s/\s+$//s; + &Apache::loncommon::add_to_env("form.$name",$value); + } } if ($i<$#lines) { $i++; @@ -139,30 +227,115 @@ sub get_posted_cgi { $r->headers_in->unset('Content-length'); } -# handle the case of the single sign on user, at this point $r->user -# will be set and valid now need to find the loncapa user info and possibly -# balance them -# returns OK if it was a SSO and user was handled -# undef if not SSO or no means to hanle the user +=pod + +=over + +=item upload_size_allowed() + + Perform size checks for file uploads to essayresponse items in course context. + + Add form.HWFILESIZE.$part_$id to %env with file size (MB) + If file exceeds maximum allowed size, add form.HWFILETOOBIG.$part_$id to %env. + +=cut + +sub upload_size_allowed { + my ($name,$size,$fname) = @_; + if ($name =~ /^HWFILE(\w+)$/) { + my $ident = $1; + my $item = 'HWFILESIZE'.$ident; + my $savesize = sprintf("%.6f",$size); + &Apache::loncommon::add_to_env("form.$item",$savesize); + my $maxsize= &Apache::lonnet::EXT("resource.$ident.maxfilesize"); + if (!$maxsize) { + $maxsize = 10.0; # FIXME This should become a domain configuration. + } + if ($size > $maxsize) { + my $warn = 'HWFILETOOBIG'.$ident; + &Apache::loncommon::add_to_env("form.$warn",$fname); + return; + } + } + return 'ok'; +} + +=pod + +=item sso_login() + + handle the case of the single sign on user, at this point $r->user + will be set and valid; now need to find the loncapa user info, and possibly + balance them. If $r->user() is set this means either it was either set by + SSO or by checkauthen.pm, if a valid cookie was found. The latter case can + be identified by the third arg ($usename), except when lonacc is called in + an internal redirect to /adm/switchserver (e.g., load-balancing following + successful authentication) -- no cookie set yet. For that particular case + simply skip the call to sso_login(). + + returns OK if it was SSO and user was handled. + returns undef if not SSO or no means to handle the user. + +=cut + sub sso_login { - my ($r,$handle) = @_; + my ($r,$handle,$username) = @_; my $lonidsdir=$r->dir_config('lonIDsDir'); - if (!($r->user - && (!defined($env{'user.name'}) && !defined($env{'user.domain'})) - && ($handle eq ''))) { + if (($r->user eq '') || ($username ne '') || ($r->user eq 'public:public') || + (defined($env{'user.name'}) && (defined($env{'user.domain'})) + && ($handle ne ''))) { # not an SSO case or already logged in return undef; } - my ($user) = ($r->user =~ m/([a-zA-Z0-9_\-@.]*)/); + my ($user) = ($r->user =~ m/^($match_username)$/); + if ($user eq '') { + return undef; + } + + my $query = $r->args; + my %form; + if ($query) { + my @items = ('role','symb','iptoken'); + &Apache::loncommon::get_unprocessed_cgi($query,\@items); + foreach my $item (@items) { + if (defined($env{'form.'.$item})) { + $form{$item} = $env{'form.'.$item}; + } + } + } + + my %sessiondata; + if ($form{'iptoken'}) { + %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'}); + my $delete = &Apache::lonnet::tmpdel($form{'iptoken'}); + unless ($sessiondata{'sessionserver'}) { + delete($form{'iptoken'}); + } + } - my $domain = $r->dir_config('lonDefDomain'); + my $domain = $r->dir_config('lonSSOUserDomain'); + if ($domain eq '') { + $domain = $r->dir_config('lonDefDomain'); + } my $home=&Apache::lonnet::homeserver($user,$domain); if ($home !~ /(con_lost|no_host|no_such_host)/) { &Apache::lonnet::logthis(" SSO authorized user $user "); - if ($r->dir_config("lonBalancer") eq 'yes') { - # login but immeaditly go to switch server to find us a new + my ($is_balancer,$otherserver,$hosthere); + if ($form{'iptoken'}) { + if (($sessiondata{'domain'} eq $domain) && + ($sessiondata{'username'} eq $user)) { + $hosthere = 1; + } + } + unless ($hosthere) { + ($is_balancer,$otherserver) = + &Apache::lonnet::check_loadbalancing($user,$domain); + } + + if ($is_balancer) { + # login but immediately go to switch server to find us a new # machine &Apache::lonauth::success($r,$user,$domain,$home,'noredirect'); $env{'request.sso.login'} = 1; @@ -170,17 +343,42 @@ sub sso_login { $env{'request.sso.reloginserver'} = $r->dir_config('lonSSOReloginServer'); } - $r->internal_redirect('/adm/switchserver'); + my $redirecturl = '/adm/switchserver'; + if ($otherserver ne '') { + $redirecturl .= '?otherserver='.$otherserver; + } + $r->internal_redirect($redirecturl); $r->set_handlers('PerlHandler'=> undef); } else { # need to login them in, so generate the need data that # migrate expects to do login - my %info=('ip' => $r->connection->remote_ip(), + my $ip; + my $c = $r->connection; + eval { + $ip = $c->remote_ip(); + }; + if ($@) { + $ip = $c->client_ip(); + } + my %info=('ip' => $ip, 'domain' => $domain, 'username' => $user, 'server' => $r->dir_config('lonHostID'), 'sso.login' => 1 ); + foreach my $item ('role','symb','iptoken') { + if (exists($form{$item})) { + $info{$item} = $form{$item}; + } + } + unless ($info{'symb'}) { + unless (($r->uri eq '/adm/roles') || ($r->uri eq '/adm/sso')) { + $info{'origurl'} = $r->uri; + } + } + if ($r->dir_config("ssodirecturl") == 1) { + $info{'origurl'} = $r->uri; + } if (defined($r->dir_config("lonSSOReloginServer"))) { $info{'sso.reloginserver'} = $r->dir_config('lonSSOReloginServer'); @@ -193,13 +391,33 @@ sub sso_login { $r->set_handlers('PerlHandler'=> undef); } return OK; - } elsif (defined($r->dir_config('lonSSOUserUnknownRedirect'))) { + } else { &Apache::lonnet::logthis(" SSO authorized unknown user $user "); - $r->subprocess_env->set('SSOUserUnknown' => $user); - $r->subprocess_env->set('SSOUserDomain' => $domain); - $r->internal_redirect($r->dir_config('lonSSOUserUnknownRedirect')); - $r->set_handlers('PerlHandler'=> undef); - return OK; + my @cancreate; + my %domconfig = + &Apache::lonnet::get_dom('configuration',['usercreation'],$domain); + if (ref($domconfig{'usercreation'}) eq 'HASH') { + if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') { + if (ref($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}) eq 'ARRAY') { + @cancreate = @{$domconfig{'usercreation'}{'cancreate'}{'selfcreate'}}; + } elsif (($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') && + ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne '')) { + @cancreate = ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}); + } + } + } + if ((grep(/^sso$/,@cancreate)) || (defined($r->dir_config('lonSSOUserUnknownRedirect')))) { + $r->subprocess_env->set('SSOUserUnknown' => $user); + $r->subprocess_env->set('SSOUserDomain' => $domain); + if (grep(/^sso$/,@cancreate)) { + $r->set_handlers('PerlHandler'=> [\&Apache::createaccount::handler]); + $r->handler('perl-script'); + } else { + $r->internal_redirect($r->dir_config('lonSSOUserUnknownRedirect')); + $r->set_handlers('PerlHandler'=> undef); + } + return OK; + } } return undef; } @@ -207,26 +425,34 @@ sub sso_login { sub handler { my $r = shift; my $requrl=$r->uri; + + if ($requrl =~ m{^/res/adm/pages/[^/]+\.(gif|png)$}) { + return OK; + } + if (&Apache::lonnet::is_domainimage($requrl)) { return OK; } - - my $handle = &Apache::lonnet::check_for_valid_session($r); + my %user; + my $handle = &Apache::lonnet::check_for_valid_session($r,undef,\%user); - my $result = &sso_login($r,$handle); - if (defined($result)) { - return $result + unless (($requrl eq '/adm/switchserver') && (!$r->is_initial_req())) { + my $result = &sso_login($r,$handle,$user{'name'}); + if (defined($result)) { + return $result; + } } + my ($is_balancer,$otherserver); - if ($r->dir_config("lonBalancer") eq 'yes') { - $r->set_handlers('PerlResponseHandler'=> - [\&Apache::switchserver::handler]); - } - if ($handle eq '') { - $r->log_reason("Cookie $handle not valid", $r->filename); + unless ((($requrl eq '/adm/switchserver') && (!$r->is_initial_req())) || + ($requrl =~ m{^/public/$match_domain/$match_courseid/syllabus}) || + ($requrl =~ m{^/adm/help/}) || + ($requrl =~ m{^/res/$match_domain/$match_username/})) { + $r->log_reason("Cookie not valid", $r->filename); + } } elsif ($handle ne '') { # ------------------------------------------------------ Initialize Environment @@ -243,6 +469,11 @@ sub handler { if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') { # -------------------------------------------------------------- Resource State + my ($cdom,$cnum); + if ($env{'request.course.id'}) { + $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'}; + $cnum = $env{'course.'.$env{'request.course.id'}.'.num'}; + } if ($requrl=~/^\/+(res|uploaded)\//) { $env{'request.state'} = "published"; } else { @@ -250,15 +481,103 @@ sub handler { } $env{'request.filename'} = $r->filename; $env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl); + my ($suppext,$checkabsolute); + if ($requrl =~ m{^/adm/wrapper/ext/}) { + my $query = $r->args; + if ($query) { + my $preserved; + foreach my $pair (split(/&/,$query)) { + my ($name, $value) = split(/=/,$pair); + unless ($name eq 'symb') { + $preserved .= $pair.'&'; + } + if (($env{'request.course.id'}) && ($name eq 'folderpath')) { + if ($value =~ /^supplemental/) { + $suppext = 1; + } + } + } + $preserved =~ s/\&$//; + if ($preserved) { + $env{'request.external.querystring'} = $preserved; + } + } + if ($env{'request.course.id'}) { + $checkabsolute = 1; + } + } elsif ($env{'request.course.id'} && + (($requrl =~ m{^/adm/$match_domain/$match_username/aboutme$}) || + ($requrl =~ m{^/public/$cdom/$cnum/syllabus$}))) { + my $query = $r->args; + if ($query) { + foreach my $pair (split(/&/,$query)) { + my ($name, $value) = split(/=/,$pair); + if ($name eq 'folderpath') { + if ($value =~ /^supplemental/) { + $suppext = 1; + } + } + } + } + if ($requrl =~ m{^/public/$cdom/$cnum/syllabus$}) { + $checkabsolute = 1; + } + } + if ($checkabsolute) { + my $hostname = $r->hostname(); + my $lonhost = &Apache::lonnet::host_from_dns($hostname); + if ($lonhost) { + my $actual = &Apache::lonnet::absolute_url($hostname); + my $expected = $Apache::lonnet::protocol{$lonhost}.'://'.$hostname; + unless ($actual eq $expected) { + $env{'request.use_absolute'} = $expected; + } + } + } # -------------------------------------------------------- Load POST parameters &Apache::lonacc::get_posted_cgi($r); +# ------------------------------------------------------ Check if load balancer + + my $checkexempt; + if ($env{'user.loadbalexempt'} eq $r->dir_config('lonHostID')) { + if ($env{'user.loadbalcheck.time'} + 600 > time) { + $checkexempt = 1; + } + } + if ($env{'user.noloadbalance'} eq $r->dir_config('lonHostID')) { + $checkexempt = 1; + } + unless ($checkexempt) { + ($is_balancer,$otherserver) = + &Apache::lonnet::check_loadbalancing($env{'user.name'}, + $env{'user.domain'}); + } + if ($is_balancer) { + $r->set_handlers('PerlResponseHandler'=> + [\&Apache::switchserver::handler]); + if ($otherserver ne '') { + $env{'form.otherserver'} = $otherserver; + } + unless (($env{'form.origurl'}) || ($r->uri eq '/adm/roles') || + ($r->uri eq '/adm/switchserver') || ($r->uri eq '/adm/sso')) { + $env{'form.origurl'} = $r->uri; + } + } + # ---------------------------------------------------------------- Check access my $now = time; if ($requrl !~ m{^/(?:adm|public|prtspool)/} || $requrl =~ /^\/adm\/.*\/(smppg|bulletinboard)(\?|$ )/x) { my $access=&Apache::lonnet::allowed('bre',$requrl); + if ($handle eq '') { + unless ($access eq 'F') { + if ($requrl =~ m{^/res/$match_domain/$match_username/}) { + $r->log_reason("Cookie not valid", $r->filename); + } + } + } if ($access eq '1') { $env{'user.error.msg'}="$requrl:bre:0:0:Choose Course"; return HTTP_NOT_ACCEPTABLE; @@ -272,8 +591,24 @@ sub handler { return OK; } if (($access ne '2') && ($access ne 'F')) { - $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied"; - return HTTP_NOT_ACCEPTABLE; + if ($requrl =~ m{^/res/}) { + $access = &Apache::lonnet::allowed('bro',$requrl); + if ($access ne 'F') { + if ($requrl eq '/res/lib/templates/simpleproblem.problem/smpedit') { + $access = &Apache::lonnet::allowed('bre','/res/lib/templates/simpleproblem.problem'); + if ($access ne 'F') { + $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied"; + return HTTP_NOT_ACCEPTABLE; + } + } else { + $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied"; + return HTTP_NOT_ACCEPTABLE; + } + } + } else { + $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied"; + return HTTP_NOT_ACCEPTABLE; + } } } if ($requrl =~ m|^/prtspool/|) { @@ -296,6 +631,7 @@ sub handler { $env{'user.domain'} eq 'public' && $requrl !~ m{^/+(res|public|uploaded)/} && $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x && + $requrl !~ m{^/adm/blockingstatus/.*$} && $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) { $env{'request.querystring'}=$r->args; $env{'request.firsturl'}=$requrl; @@ -305,17 +641,19 @@ sub handler { if ($env{'request.course.id'}) { &Apache::lonnet::countacc($requrl); $requrl=~/\.(\w+)$/; + my $query=$r->args; if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') || - ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$ )/x) || + ($requrl=~/^\/adm\/.*\/(aboutme|smppg|bulletinboard)(\?|$ )/x) || ($requrl=~/^\/adm\/wrapper\//) || ($requrl=~m|^/adm/coursedocs/showdoc/|) || ($requrl=~m|\.problem/smpedit$|) || - ($requrl=~/^\/public\/.*\/syllabus$/)) { + ($requrl=~/^\/public\/.*\/syllabus$/) || + ($requrl=~/^\/adm\/(viewclasslist|navmaps)$/) || + ($requrl=~/^\/adm\/.*\/aboutme\/portfolio(\?|$)/)) { # ------------------------------------- This is serious stuff, get symb and log - my $query=$r->args; my $symb; if ($query) { - &Apache::loncommon::get_unprocessed_cgi($query,['symb']); + &Apache::loncommon::get_unprocessed_cgi($query,['symb','folderpath']); } if ($env{'form.symb'}) { $symb=&Apache::lonnet::symbclean($env{'form.symb'}); @@ -326,7 +664,9 @@ sub handler { 'last_known' =>[$murl,$mid]); } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) || (($requrl=~m|(.*)/smpedit$|) && - &Apache::lonnet::symbverify($symb,$1))) { + &Apache::lonnet::symbverify($symb,$1)) || + (($requrl=~m|(.*/aboutme)/portfolio$|) && + &Apache::lonnet::symbverify($symb,$1))) { my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb); &Apache::lonnet::symblist($map,$murl => [$murl,$mid], 'last_known' =>[$murl,$mid]); @@ -338,19 +678,24 @@ sub handler { return HTTP_NOT_ACCEPTABLE; } } else { - $symb=&Apache::lonnet::symbread($requrl); - if (&Apache::lonnet::is_on_map($requrl) && $symb && - !&Apache::lonnet::symbverify($symb,$requrl)) { - $r->log_reason('Invalid symb for '.$requrl.': '.$symb); - $env{'user.error.msg'}= - "$requrl:bre:1:1:Invalid Access"; - return HTTP_NOT_ACCEPTABLE; - } - if ($symb) { - my ($map,$mid,$murl)= - &Apache::lonnet::decode_symb($symb); - &Apache::lonnet::symblist($map,$murl =>[$murl,$mid], - 'last_known' =>[$murl,$mid]); + if ($requrl=~m{^(/adm/.*/aboutme)/portfolio$}) { + $requrl = $1; + } + unless ($suppext) { + $symb=&Apache::lonnet::symbread($requrl); + if (&Apache::lonnet::is_on_map($requrl) && $symb && + !&Apache::lonnet::symbverify($symb,$requrl)) { + $r->log_reason('Invalid symb for '.$requrl.': '.$symb); + $env{'user.error.msg'}= + "$requrl:bre:1:1:Invalid Access"; + return HTTP_NOT_ACCEPTABLE; + } + if ($symb) { + my ($map,$mid,$murl)= + &Apache::lonnet::decode_symb($symb); + &Apache::lonnet::symblist($map,$murl =>[$murl,$mid], + 'last_known' =>[$murl,$mid]); + } } } $env{'request.symb'}=$symb; @@ -359,8 +704,38 @@ sub handler { # ------------------------------------------------------- This is other content &Apache::lonnet::courseacclog($requrl); } + if ($requrl =~ m{^/+uploaded/\Q$cdom\E/\Q$cnum\E/(docs|supplemental)/.+\.html?$}) { + if (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) { + if ($query) { + &Apache::loncommon::get_unprocessed_cgi($query,['forceedit']); + if ($env{'form.forceedit'}) { + $env{'request.state'} = 'edit'; + } + } + } + } elsif ($requrl =~ m{^/+uploaded/\Q$cdom\E/\Q$cnum\E/portfolio/syllabus/.+\.html?$}) { + if (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) { + if ($query) { + &Apache::loncommon::get_unprocessed_cgi($query,['forceedit','editmode']); + if (($env{'form.forceedit'}) || ($env{'form.editmode'})) { + $env{'request.state'} = 'edit'; + } + } + } + } } return OK; + } else { + my $defdom=$r->dir_config('lonDefDomain'); + ($is_balancer,$otherserver) = + &Apache::lonnet::check_loadbalancing(undef,$defdom); + if ($is_balancer) { + $r->set_handlers('PerlResponseHandler'=> + [\&Apache::switchserver::handler]); + if ($otherserver ne '') { + $env{'form.otherserver'} = $otherserver; + } + } } # -------------------------------------------- See if this is a public resource if ($requrl=~m|^/+adm/+help/+|) { @@ -397,64 +772,9 @@ sub handler { 1; __END__ -=head1 NAME - -Apache::lonacc - Cookie Based Access Handler - -=head1 SYNOPSIS - -Invoked (for various locations) by /etc/httpd/conf/srm.conf: - - PerlAccessHandler Apache::lonacc - -=head1 INTRODUCTION - -This module enables cookie based authentication and is used -to control access for many different LON-CAPA URIs. - -Whenever the client sends the cookie back to the server, -this cookie is handled by either lonacc.pm or loncacc.pm -(see srm.conf for what is invoked when). If -the cookie is missing or invalid, the user is re-challenged -for login information. - -This is part of the LearningOnline Network with CAPA project -described at http://www.lon-capa.org. - -=head1 HANDLER SUBROUTINE - -This routine is called by Apache and mod_perl. - -=over 4 - -=item * - -transfer profile into environment - -=item * - -load POST parameters - -=item * - -check access - -=item * - -if allowed, get symb, log, generate course statistics if applicable - -=item * - -otherwise return error - -=item * - -see if public resource - -=item * - -store attempted access +=pod =back =cut +