Apache::lonacc - Cookie Based Access Handler
Invoked (for various locations) by /etc/httpd/conf/srm.conf:
PerlAccessHandler Apache::lonacc
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.
This routine is called by Apache and mod_perl.
transfer profile into environment
load POST parameters
check access
if allowed, get symb, log, generate course statistics if applicable
otherwise return error
see if public resource
store attempted access
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.
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,$username) = @_;
my $lonidsdir=$r->dir_config('lonIDsDir');
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 $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{'token'});
}
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 $user ");
my ($is_balancer,$otherserver,$hosthere);
if ($form{'iptoken'}) {
if (($sessiondata{'domain'} eq $form{'udom'}) &&
($sessiondata{'username'} eq $form{'uname'})) {
$hosthere = 1;
}
}
unless ($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');
$env{'request.sso.login'} = 1;
if (defined($r->dir_config("lonSSOReloginServer"))) {
$env{'request.sso.reloginserver'} =
$r->dir_config('lonSSOReloginServer');
}
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 $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 $item ('role','symb') {
if (exists($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');
}
my $token =
&Apache::lonnet::tmpput(\%info,
$r->dir_config('lonHostID'));
$env{'form.token'} = $token;
$r->internal_redirect('/adm/migrateuser');
$r->set_handlers('PerlHandler'=> undef);
}
return OK;
} else {
&Apache::lonnet::logthis(" SSO authorized unknown user $user ");
my @cancreate;
my %domconfig =
&Apache::lonnet::get_dom('configuration',['usercreation'],$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;
}
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 %user;
my $handle = &Apache::lonnet::check_for_valid_session($r,undef,\%user);
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,$otherserver);
if ($handle eq '') {
unless (($requrl eq '/adm/switchserver') && (!$r->is_initial_req())) {
$r->log_reason("Cookie not valid", $r->filename);
}
} elsif ($handle ne '') {
| # ------------------------------------------------------ Initialize Environment | |
| my $lonidsdir=$r->dir_config('lonIDsDir'); | |
| &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle); |
# --------------------------------------------------------- Initialize Language
&Apache::lonlocal::get_language_handle($r);
}
# -------------------------------------------------- Should be a valid user now if ($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 {
$env{'request.state'} = 'unknown';
}
$env{'request.filename'} = $r->filename;
$env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
my $suppext;
if ($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'} = $preserved;
}
}
} elsif ($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/) {
$suppext = 1;
}
}
}
}
}
# -------------------------------------------------------- Load POST parameters
&Apache::lonacc::get_posted_cgi($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 ($access eq '1') { $env{'user.error.msg'}=``$requrl:bre:0:0:Choose Course''; return HTTP_NOT_ACCEPTABLE; } if ($access eq 'A') { &Apache::restrictedaccess::setup_handler($r); return OK; } if ($access eq 'B') { &Apache::blockedaccess::setup_handler($r); return OK; } if (($access ne '2') && ($access ne 'F')) { 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/|) { my $start='/prtspool/'.$env{'user.name'}.'_'. $env{'user.domain'}; if ($requrl !~ /^\Q$start\E/) { $env{'user.error.msg'}=``$requrl:bre:1:1:Access Denied''; return HTTP_NOT_ACCEPTABLE; } } if ($requrl =~ m|^/zipspool/|) { my $start='/zipspool/zipout/'.$env{'user.name'}.``:''. $env{'user.domain'}; if ($requrl !~ /^\Q$start\E/) { $env{'user.error.msg'}=``$requrl:bre:1:1:Access Denied''; return HTTP_NOT_ACCEPTABLE; } } if ($env{'user.name'} eq 'public' && $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; return FORBIDDEN; } # ------------------------------------------------------------- This is allowed 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|smppg|bulletinboard)(\?|$ )/x) || ($requrl=~/^\/adm\/wrapper\//) || ($requrl=~m|^/adm/coursedocs/showdoc/|) || ($requrl=~m|\.problem/smpedit$|) || ($requrl=~/^\/public\/.*\/syllabus$/) || ($requrl=~/^\/adm\/(viewclasslist|navmaps)$/) || ($requrl=~/^\/adm\/.*\/aboutme\/portfolio(\?|$)/)) { # ------------------------------------- This is serious stuff, get symb and log my $symb; if ($query) { &Apache::loncommon::get_unprocessed_cgi($query,['symb','folderpath']); } if ($env{'form.symb'}) { $symb=&Apache::lonnet::symbclean($env{'form.symb'}); if ($requrl =~ m|^/adm/wrapper/| || $requrl =~ m|^/adm/coursedocs/showdoc/|) { my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb); &Apache::lonnet::symblist($map,$murl => [$murl,$mid], 'last_known' =>[$murl,$mid]); } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) || (($requrl=~m|(.*)/smpedit$|) && &Apache::lonnet::symbverify($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]); } else { $r->log_reason('Invalid symb for '.$requrl.': '. $symb); $env{'user.error.msg'}= ``$requrl:bre:1:1:Invalid Access''; return HTTP_NOT_ACCEPTABLE; } } else { 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; &Apache::lonnet::courseacclog($symb); } else { # ------------------------------------------------------- This is other content &Apache::lonnet::courseacclog($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/+|) { return OK; } # ------------------------------------ See if this is a viewable portfolio file if (&Apache::lonnet::is_portfolio_url($requrl)) { my $access=&Apache::lonnet::allowed('bre',$requrl); if ($access eq 'A') { &Apache::restrictedaccess::setup_handler($r); return OK; } if (($access ne '2') && ($access ne 'F')) { $env{'user.error.msg'}=``$requrl:bre:1:1:Access Denied''; return HTTP_NOT_ACCEPTABLE; } }
# -------------------------------------------------------------- Not authorized $requrl=~/\.(\w+)$/; # if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') || # ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) || # ($requrl=~m|^/prtspool/|)) { # -------------------------- Store where they wanted to go and get login screen $env{'request.querystring'}=$r->args; $env{'request.firsturl'}=$requrl; return FORBIDDEN; # } else { # --------------------------------------------------------------------- Goodbye # return HTTP_BAD_REQUEST; # } }
1; __END__