# The LearningOnline Network
# User Authentication Module
#
# $Id: lonauth.pm,v 1.121.2.24.2.4 2022/07/08 15:40:03 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
package Apache::lonauth;
use strict;
use LONCAPA qw(:DEFAULT :match);
use Apache::Constants qw(:common);
use CGI qw(:standard);
use Apache::loncommon();
use Apache::lonnet;
use Apache::lonmenu();
use Apache::createaccount;
use Fcntl qw(:flock);
use Apache::lonlocal;
use Apache::File();
use HTML::Entities;
use Digest::MD5;
use CGI::Cookie();
# ------------------------------------------------------------ Successful login
sub success {
my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
$form,$cid,$expirepub) = @_;
# ------------------------------------------------------------ Get cookie ready
my $cookie =
&Apache::loncommon::init_user_environment($r, $username, $domain,
$authhost, $form,
{'extra_env' => $extra_env,});
my $public=($username eq 'public' && $domain eq 'public');
if ($public or $lowerurl eq 'noredirect') { return $cookie; }
# -------------------------------------------------------------------- Log this
my $ip = &Apache::lonnet::get_requestor_ip();
&Apache::lonnet::log($domain,$username,$authhost,
"Login $ip");
# ------------------------------------------------- Check for critical messages
my @what=&Apache::lonnet::dump('critical',$domain,$username);
if ($what[0]) {
if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
$lowerurl='/adm/email?critical=display';
}
}
# ------------------------------------------------------------ Get cookies ready
my ($securecookie,$defaultcookie);
my $ssl = $r->subprocess_env('https');
if ($ssl) {
$securecookie="lonSID=$cookie; path=/; HttpOnly; secure";
my $lonidsdir=$r->dir_config('lonIDsDir');
if (($lonidsdir) && (-e "$lonidsdir/$cookie.id")) {
my $linkname=substr(Digest::MD5::md5_hex(Digest::MD5::md5_hex(time(). {}. rand(). $$)), 0, 32).'_linked';
if (-e "$lonidsdir/$linkname.id") {
unlink("$lonidsdir/$linkname.id");
}
my $made_symlink = eval { symlink("$lonidsdir/$cookie.id",
"$lonidsdir/$linkname.id"); 1 };
if ($made_symlink) {
$defaultcookie = "lonLinkID=$linkname; path=/; HttpOnly;";
&Apache::lonnet::appenv({'user.linkedenv' => $linkname});
}
}
} else {
$defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
}
# -------------------------------------------------------- Menu script and info
my $destination = $lowerurl;
if (defined($form->{role})) {
my $envkey = 'user.role.'.$form->{role};
my $now=time;
my $then=$env{'user.login.time'};
my $refresh=$env{'user.refresh.time'};
my $update=$env{'user.update.time'};
if (!$update) {
$update = $then;
}
if (exists($env{$envkey})) {
my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
&Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
\$trolecode,\$tstatus,\$tstart,\$tend);
if ($tstatus eq 'is') {
$destination .= ($destination =~ /\?/) ? '&' : '?';
my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
$destination .= 'selectrole=1&'.$newrole.'=1';
}
}
}
if (defined($form->{symb})) {
my $destsymb = $form->{symb};
my $encrypted;
if ($destsymb =~ m{^/enc/}) {
$encrypted = 1;
if ($cid) {
$destsymb = &Apache::lonenc::unencrypted($destsymb,$cid);
}
}
$destination .= ($destination =~ /\?/) ? '&' : '?';
if ($destsymb =~ /___/) {
my ($map,$resid,$desturl)=split(/___/,$destsymb);
$desturl = &Apache::lonnet::clutter($desturl);
if ($encrypted) {
$desturl = &Apache::lonenc::encrypted($desturl,1,$cid);
$destsymb = $form->{symb};
}
$desturl = &HTML::Entities::encode($desturl,'"<>&');
$destsymb = &HTML::Entities::encode($destsymb,'"<>&');
$destination .= 'destinationurl='.$desturl.
'&destsymb='.$destsymb;
} elsif (!$encrypted) {
$destsymb = &HTML::Entities::encode($destsymb,'"<>&');
$destination .= 'destinationurl='.$destsymb;
}
}
if ($destination =~ m{^/adm/roles}) {
$destination .= ($destination =~ /\?/) ? '&' : '?';
$destination .= 'source=login';
}
my $brcrum = [{'href' => '',
'text' => 'Successful Login'},];
my $args = {'no_inline_link' => 1,
'bread_crumbs' => $brcrum,};
if (($env{'request.deeplink.login'} eq $lowerurl) &&
(($env{'request.linkprot'}) || ($env{'request.linkkey'} ne ''))) {
my %info;
if ($env{'request.linkprot'}) {
$info{'linkprot'} = $env{'request.linkprot'};
foreach my $item ('linkprotuser','linkprotexit') {
if ($form->{$item}) {
$info{$item} = $form->{$item};
}
}
$args = {'only_body' => 1,};
} elsif ($env{'request.linkkey'} ne '') {
$info{'linkkey'} = $env{'request.linkkey'};
}
$info{'origurl'} = $lowerurl;
my $token = &Apache::lonnet::tmpput(\%info,$r->dir_config('lonHostID'),'link');
unless (($token eq 'con_lost') || ($token eq 'refused') ||
($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
$destination .= (($destination =~ /\?/) ? '&' : '?') . 'ttoken='.$token;
}
}
if ($env{'request.deeplink.login'}) {
if ($env{'environment.remote'} eq 'on') {
&Apache::lonnet::appenv({'environment.remote' => 'off'});
}
}
my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});
my $startupremote=&Apache::lonmenu::startupremote($destination);
my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
my $setflags=&Apache::lonmenu::setflags();
my $maincall=&Apache::lonmenu::maincall();
my $start_page=&Apache::loncommon::start_page('Successful Login',
$startupremote,$args);
my $end_page =&Apache::loncommon::end_page();
my $continuelink;
if ($env{'environment.remote'} eq 'off') {
$continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
}
# ------------------------------------------------- Output for successful login
&Apache::loncommon::content_type($r,'text/html');
if ($securecookie) {
$r->headers_out->add('Set-cookie' => $securecookie);
}
if ($defaultcookie) {
$r->headers_out->add('Set-cookie' => $defaultcookie);
}
if ($expirepub) {
my $c = new CGI::Cookie(-name => 'lonPubID',
-value => '',
-expires => '-10y',);
$r->headers_out->add('Set-cookie' => $c);
}
$r->send_http_header;
if ($env{'request.linkprot'}) {
$r->print(<<END);
$start_page
<br />$continuelink
$end_page
END
} else {
my %lt=&Apache::lonlocal::texthash(
'wel' => 'Welcome',
'pro' => 'Login problems?',
);
my $loginhelp = &loginhelpdisplay($domain);
if ($loginhelp) {
$loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
}
my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
$r->print(<<ENDSUCCESS);
$start_page
$setflags
$windowinfo
<h1>$lt{'wel'}</h1>
$welcome
$loginhelp
$remoteinfo
$maincall
$continuelink
$end_page
ENDSUCCESS
}
return;
}
# --------------------------------------------------------------- Failed login!
sub failed {
my ($r,$message,$form,$authhost) = @_;
(undef,undef,undef,my $clientmathml,my $clientunicode) =
&Apache::loncommon::decode_user_agent();
my $args = {};
if ($clientunicode && !$clientmathml) {
$args = {'browser.unicode' => 1};
}
if ($form->{firsturl} =~ m{^/tiny/$match_domain/\w+$}) {
if ($form->{linkprot}) {
$args->{only_body} = 1;
}
}
my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
if (&Apache::lonnet::domain($udom,'description') eq '') {
undef($udom);
}
my $retry = '/adm/login';
if ($uname eq $form->{'uname'}) {
$retry .= '?username='.$uname;
}
if ($udom) {
$retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
}
my $lonhost = $r->dir_config('lonHostID');
my $querystr;
my $result = &set_retry_token($form,$lonhost,\$querystr);
if ($result eq 'fail') {
if (exists($form->{role})) {
my $role = &Apache::loncommon::cleanup_html($form->{role});
if ($role ne '') {
$retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
}
}
if (exists($form->{symb})) {
my $symb = &Apache::loncommon::cleanup_html($form->{symb});
if ($symb ne '') {
$retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
}
}
if (exists($form->{firsturl})) {
my $firsturl = &Apache::loncommon::cleanup_html($form->{firsturl});
if ($firsturl ne '') {
$retry .= (($retry=~/\?/)?'&':'?').'firsturl='.$firsturl;
if ($form->{firsturl} =~ m{^/tiny/$match_domain/\w+$}) {
unless (exists($form->{linkprot})) {
if (exists($form->{linkkey})) {
$retry .= 'linkkey='.$form->{linkkey};
}
}
}
}
}
if (exists($form->{linkprot})) {
my %info = (
'linkprot' => $form->{'linkprot'},
);
foreach my $item ('linkprotuser','linkprotexit') {
if ($form->{$item} ne '') {
$info{$item} = $form->{$item};
}
}
my $ltoken = &Apache::lonnet::tmpput(\%info,
$r->dir_config('lonHostID'),'retry');
if ($ltoken) {
$retry .= (($retry =~ /\?/) ? '&' : '?').'ltoken='.$ltoken;
}
}
} elsif ($querystr ne '') {
$retry .= (($retry=~/\?/)?'&':'?').$querystr;
}
my $end_page = &Apache::loncommon::end_page();
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
my @actions =
(&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
my $loginhelp = &loginhelpdisplay($udom);
if ($loginhelp) {
push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
}
#FIXME: link to helpdesk might be added here
$r->print(
$start_page
.'<h2>'.&mt('Sorry ...').'</h2>'
.&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
.&Apache::lonhtmlcommon::actionbox(\@actions)
.$end_page
);
}
# ------------------------------------------------------------------ Rerouting!
sub reroute {
my ($r) = @_;
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
my $msg='<b>'.&mt('Sorry ...').'</b><br />'
.&mt('Please [_1]log in again[_2].');
&Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
}
# ---------------------------------------------------------------- Main handler
sub handler {
my $r = shift;
my $londocroot = $r->dir_config('lonDocRoot');
# Are we re-routing?
if (-e "$londocroot/lon-status/reroute.txt") {
&reroute($r);
return OK;
}
&Apache::lonlocal::get_language_handle($r);
# -------------------------------- Prevent users from attempting to login twice
my $handle = &Apache::lonnet::check_for_valid_session($r);
if ($handle ne '') {
my $lonidsdir=$r->dir_config('lonIDsDir');
if ($handle=~/^publicuser\_/) {
# For "public user" - remove it, we apparently really want to login
unlink($r->dir_config('lonIDsDir')."/$handle.id");
} else {
# Indeed, a valid token is found
&Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
my $start_page =
&Apache::loncommon::start_page('Already logged in');
my $end_page =
&Apache::loncommon::end_page();
my $dest = '/adm/roles';
my %form = &get_form_items($r);
if ($form{'logtoken'}) {
my $tmpinfo = &Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
$form{'serverid'});
unless (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
($tmpinfo eq 'no_such_host')) {
my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
$firsturl = &unescape($firsturl);
my %info;
foreach my $item (@rest) {
my ($key,$value) = split(/=/,$item);
$info{$key} = &unescape($value);
}
if ($firsturl ne '') {
$info{'firsturl'} = $firsturl;
$dest = $firsturl;
my $relogin;
if ($dest =~ m{^/tiny/$match_domain/\w+$}) {
if ($env{'request.course.id'}) {
my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
my $symb = &Apache::loncommon::symb_from_tinyurl($dest,$cnum,$cdom);
if ($symb) {
unless (&set_deeplink_login(%info) eq 'ok') {
$relogin = 1;
}
}
}
if ($relogin) {
$r->print(
$start_page
.'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
.'<p>'.&mt('Please [_1]log out[_2] first, and then try your access again',
'<a href="/adm/logout">','</a>')
.'</p>'
.$end_page);
} else {
if (($info{'linkprot'}) || ($info{'linkkey'} ne '')) {
if (($info{'linkprot'}) && ($info{'linkprotuser'} ne '')) {
unless ($info{'linkprotuser'} eq $env{'user.name'}.':'.$env{'user.domain'}) {
$r->print(
$start_page
.'<p class="LC_warning">'.&mt('You are already logged in, but as a different user from the one expected for the link you followed from another system').'</p>'
.'<p>'.&mt('Please [_1]log out[_2] first, and then try following the link again from the other system',
'<a href="/adm/logout">','</a>')
.'</p>'
.$end_page);
return OK;
}
}
my $token = &Apache::lonnet::tmpput(\%info,$r->dir_config('lonHostID'),'link');
unless (($token eq 'con_lost') || ($token eq 'refused') ||
($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
$dest .= (($dest =~ /\?/) ? '&' : '?') . 'ttoken='.$token;
}
}
$r->print(
$start_page
.'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
.'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4] first, and then try your access again',
'<a href="'.$dest.'">','</a>',
'<a href="/adm/logout">','</a>')
.'</p>'
.$end_page);
}
return OK;
}
}
}
}
$r->print(
$start_page
.'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
.'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
.'</p>'
.$end_page
);
return OK;
}
}
# ---------------------------------------------------- No valid token, continue
my %form = &get_form_items($r);
if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
&failed($r,'Username, password and domain need to be specified.',
\%form);
return OK;
}
# split user logging in and "su"-user
($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
$form{'uname'} = &LONCAPA::clean_username($form{'uname'});
$form{'suname'}= &LONCAPA::clean_username($form{'suname'});
$form{'udom'} = &LONCAPA::clean_domain($form{'udom'});
$form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
my $role = $r->dir_config('lonRole');
my $domain = $r->dir_config('lonDefDomain');
my $prodir = $r->dir_config('lonUsersDir');
my $contact_name = &mt('LON-CAPA helpdesk');
# ---------------------------------------- Get the information from login token
my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
$form{'serverid'});
if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
($tmpinfo eq 'no_such_host')) {
&failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
return OK;
} else {
my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
$form{'serverid'});
if ( $reply ne 'ok' ) {
&failed($r,'Session could not be opened.',\%form);
&Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
return OK;
}
}
if (!&Apache::lonnet::domain($form{'udom'})) {
&failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
return OK;
}
my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
$firsturl = &unescape($firsturl);
foreach my $item (@rest) {
my ($key,$value) = split(/=/,$item);
$form{$key} = &unescape($value);
}
if ($firsturl =~ m{^/tiny/$match_domain/\w+$}) {
$form{'firsturl'} = $firsturl;
}
my $upass = &Apache::loncommon::des_decrypt($des_key,$form{'upass0'});
# ---------------------------------------------------------------- Authenticate
my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
my ($cancreate,$statustocreate) =
&Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
my $defaultauth;
if (ref($cancreate) eq 'ARRAY') {
if (grep(/^login$/,@{$cancreate})) {
$defaultauth = 1;
}
}
my $clientcancheckhost = 1;
my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
$form{'udom'},$defaultauth,
$clientcancheckhost);
# --------------------------------------------------------------------- Failed?
if ($authhost eq 'no_host') {
my $pwdverify;
if (&Apache::lonnet::homeserver($form{'uname'},$form{'udom'}) eq 'no_host') {
my %possunames = &alternate_unames_check($form{'uname'},$form{'udom'});
if (keys(%possunames) > 0) {
foreach my $rulematch (keys(%possunames)) {
my $possuname = $possunames{$rulematch};
if (($possuname ne '') && ($possuname =~ /^$match_username$/)) {
$authhost=Apache::lonnet::authenticate($possuname,$upass,
$form{'udom'},undef,
$clientcancheckhost);
if (($authhost eq 'no_host') || ($authhost eq 'no_account_on_host')) {
next;
} elsif (($authhost ne '') && (&Apache::lonnet::hostname($authhost) ne '')) {
$pwdverify = 1;
&Apache::lonnet::logthis("Authenticated user: $possuname was submitted as: $form{'uname'}");
$form{'uname'} = $possuname;
last;
}
}
}
}
}
unless ($pwdverify) {
&failed($r,'Username and/or password could not be authenticated.',
\%form);
return OK;
}
} elsif ($authhost eq 'no_account_on_host') {
if ($defaultauth) {
my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
return OK;
}
my $start_page =
&Apache::loncommon::start_page('Create a user account in LON-CAPA',
'',{'no_inline_link' => 1,});
my $lonhost = $r->dir_config('lonHostID');
my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
my $contacts =
&Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
$form{'udom'},$origmail);
my ($contact_email) = split(',',$contacts);
my $output =
&Apache::createaccount::username_check($form{'uname'},$form{'udom'},
$domdesc,'',$lonhost,
$contact_email,$contact_name,
undef,$statustocreate);
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
&Apache::createaccount::print_header($r,$start_page);
$r->print('<h3>'.&mt('Account creation').'</h3>'.
&mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
$output.&Apache::loncommon::end_page());
return OK;
} else {
&failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form);
return OK;
}
}
if (($firsturl eq '') ||
($firsturl=~/^\/adm\/(logout|remote)/)) {
$firsturl='/adm/roles';
}
my ($hosthere,%sessiondata);
if ($form{'iptoken'}) {
%sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
if (($sessiondata{'domain'} eq $form{'udom'}) &&
($sessiondata{'username'} eq $form{'uname'})) {
$hosthere = 1;
}
}
# --------------------------------- Are we attempting to login as somebody else?
if ($form{'suname'}) {
my ($suname,$sudom,$sudomref);
$suname = $form{'suname'};
$sudom = $form{'udom'};
if ($form{'sudom'}) {
unless ($sudom eq $form{'sudom'}) {
if (&Apache::lonnet::domain($form{'sudom'})) {
$sudomref = [$form{'sudom'}];
$sudom = $form{'sudom'};
}
}
}
# ------------ see if the original user has enough privileges to pull this stunt
if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
# ---------------------------------------------------- see if the su-user exists
unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
# ------------------------------ see if the su-user is not too highly privileged
if (&Apache::lonnet::privileged($suname,$sudom)) {
&Apache::lonnet::logthis('Attempted switch user to privileged user');
} else {
my $noprivswitch;
#
# su-user's home server and user's home server must have one of:
# (a) same domain
# (b) same primary library server for the two domains
# (c) same "internet domain" for primary library server(s) for home servers' domains
#
my $suprim = &Apache::lonnet::domain($sudom,'primary');
my $suintdom = &Apache::lonnet::internet_dom($suprim);
unless ($sudom eq $form{'udom'}) {
my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
my $uintdom = &Apache::lonnet::internet_dom($uprim);
unless ($suprim eq $uprim) {
unless ($suintdom eq $uintdom) {
&Apache::lonnet::logthis('Attempted switch user '
.'to user with different "internet domain".');
$noprivswitch = 1;
}
}
}
unless ($noprivswitch) {
#
# server where log-in occurs must have same "internet domain" as su-user's home
# server
#
my $lonhost = $r->dir_config('lonHostID');
my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
if ($hostintdom ne $suintdom) {
&Apache::lonnet::logthis('Attempted switch user on a '
.'server with a different "internet domain".');
} else {
# -------------------------------------------------------- actually switch users
&Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
$form{'udom'}.' logging in as '.$suname.':'.$sudom);
$form{'uname'}=$suname;
if ($form{'udom'} ne $sudom) {
$form{'udom'}=$sudom;
}
}
}
}
}
} else {
&Apache::lonnet::logthis('Non-privileged user attempting switch user');
}
}
if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
if (($form{'linkprot'}) && ($form{'linkprotuser'} ne '')) {
unless($form{'linkprotuser'} eq $form{'uname'}.':'.$form{'udom'}) {
delete($form{'udom'});
delete($form{'uname'});
&failed($r,'Username and/or domain are different to that expected for the link you followed from another system',
\%form,$authhost);
return OK;
}
}
}
my ($is_balancer,$otherserver);
unless ($hosthere) {
($is_balancer,$otherserver) =
&Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
if ($is_balancer) {
# Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
$otherserver = $found_server;
}
if ($otherserver eq '') {
my $lowest_load;
($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
if ($lowest_load > 100) {
$otherserver = &Apache::lonnet::spareserver($r,$lowest_load,$lowest_load,1,$form{'udom'});
}
}
if ($otherserver ne '') {
my @hosts = &Apache::lonnet::current_machine_ids();
if (grep(/^\Q$otherserver\E$/,@hosts)) {
$hosthere = $otherserver;
}
}
}
}
if (($is_balancer) && (!$hosthere)) {
if ($otherserver) {
&success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
\%form);
my $switchto = '/adm/switchserver?otherserver='.$otherserver;
if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
$switchto .= '&origurl='.$firsturl;
}
if ($form{'role'}) {
$switchto .= '&role='.$form{'role'};
}
if ($form{'symb'}) {
$switchto .= '&symb='.$form{'symb'};
}
if ($form{'linkprot'}) {
$env{'request.linkprot'} = $form{'linkprot'};
foreach my $item ('linkprotuser','linkprotexit') {
if ($form{$item}) {
$env{'request.'.$item} = $form{$item};
}
}
} elsif ($form{'linkkey'} ne '') {
$env{'request.linkkey'} = $form{'linkkey'};
}
if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
&set_deeplink_login(%form);
}
$r->internal_redirect($switchto);
} else {
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
$r->print(&noswitch());
}
return OK;
} else {
if (!&check_can_host($r,\%form,$authhost)) {
my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
if ($otherserver) {
&success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
\%form);
my $switchto = '/adm/switchserver?otherserver='.$otherserver;
if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
$switchto .= '&origurl='.$firsturl;
}
if ($form{'role'}) {
$switchto .= '&role='.$form{'role'};
}
if ($form{'symb'}) {
$switchto .= '&symb='.$form{'symb'};
}
if ($form{'linkprot'}) {
$env{'request.linkprot'} = $form{'linkprot'};
foreach my $item ('linkprotuser','linkprotexit') {
if ($form{$item}) {
$env{'request.'.$item} = $form{$item};
}
}
} elsif ($form{'linkkey'} ne '') {
$env{'request.linkkey'} = $form{'linkkey'};
}
if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
&set_deeplink_login(%form);
}
$r->internal_redirect($switchto);
} else {
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
$r->print(&noswitch());
}
return OK;
}
# ------------------------------------------------------- Do the load balancing
# ---------------------------------------------------------- Determine own load
my $loadlim = $r->dir_config('lonLoadLim');
my $loadavg;
{
my $loadfile=Apache::File->new('/proc/loadavg');
$loadavg=<$loadfile>;
}
$loadavg =~ s/\s.*//g;
my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
my $userloadpercent=&Apache::lonnet::userload();
# ---------------------------------------------------------- Are we overloaded?
if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
my $unloaded=Apache::lonnet::spareserver($r,$loadpercent,$userloadpercent,1,$form{'udom'});
if (!$unloaded) {
($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
}
if ($unloaded) {
&success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
undef,\%form);
if ($form{'linkprot'}) {
$env{'request.linkprot'} = $form{'linkprot'};
} elsif ($form{'linkkey'} ne '') {
$env{'request.linkkey'} = $form{'linkkey'};
}
if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
&set_deeplink_login(%form);
}
$r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
return OK;
}
}
if (($is_balancer) && ($hosthere)) {
$form{'noloadbalance'} = $hosthere;
}
my $extra_env;
if (($hosthere) && ($sessiondata{'sessionserver'} ne '')) {
if ($sessiondata{'origurl'} ne '') {
$firsturl = $sessiondata{'origurl'};
$form{'firsturl'} = $sessiondata{'origurl'};
my @names = ('role','symb','linkprot','linkkey');
foreach my $item (@names) {
if ($sessiondata{$item} ne '') {
$form{$item} = $sessiondata{$item};
}
}
}
}
if ($form{'linkprot'}) {
my ($linkprotector,$uri) = split(/:/,$form{'linkprot'},2);
if ($linkprotector) {
$extra_env = {'user.linkprotector' => $linkprotector,
'user.linkproturi' => $uri};
}
} elsif ($form{'linkkey'} ne '') {
$extra_env = {'user.deeplinkkey' => $form{'linkkey'},
'user.keyedlinkuri' => $form{'firsturl'}};
}
if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
&set_deeplink_login(%form);
if ($form{'linkprot'}) {
if (ref($extra_env) eq 'HASH') {
%{$extra_env} = ( %{$extra_env}, 'request.linkprot' => $form{'linkprot'} );
} else {
$extra_env = {'request.linkprot' => $form{'linkprot'}};
}
if ($form{'linkprotexit'}) {
$extra_env->{'request.linkprotexit'} = $form{'linkprotexit'};
}
} elsif ($form{'linkkey'} ne '') {
if (ref($extra_env) eq 'HASH') {
%{$extra_env} = ( %{$extra_env}, 'request.linkkey' => $form{'linkkey'} );
} else {
$extra_env = {'request.linkkey' => $form{'linkkey'}};
}
}
if ($env{'request.deeplink.login'}) {
if (ref($extra_env) eq 'HASH') {
%{$extra_env} = ( %{$extra_env}, 'request.deeplink.login' => $form{'firsturl'} );
} else {
$extra_env = {'request.deeplink.login' => $form{'firsturl'}};
}
}
}
&success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,$extra_env,
\%form);
return OK;
}
}
sub get_form_items {
my ($r) = @_;
my $buffer;
if ($r->header_in('Content-length') > 0) {
$r->read($buffer,$r->header_in('Content-length'),0);
}
my %form;
foreach my $pair (split(/&/,$buffer)) {
my ($name,$value) = split(/=/,$pair);
$value =~ tr/+/ /;
$value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
$form{$name}=$value;
}
return %form;
}
sub set_deeplink_login {
my (%form) = @_;
my $disallow;
if ($form{'firsturl'} =~ m{^/tiny/($match_domain)/\w+$}) {
my $cdom = $1;
my ($cnum,$symb) = &Apache::loncommon::symb_from_tinyurl($form{'firsturl'},'',$cdom);
if ($symb) {
if ($env{'request.course.id'} eq $cdom.'_'.$cnum) {
my $deeplink;
if ($symb =~ /\.(page|sequence)$/) {
my $mapname = &Apache::lonnet::deversion((&Apache::lonnet::decode_symb($symb))[2]);
my $navmap = Apache::lonnavmaps::navmap->new();
if (ref($navmap)) {
$deeplink = $navmap->get_mapparam(undef,$mapname,'0.deeplink');
}
} else {
$deeplink = &Apache::lonnet::EXT('resource.0.deeplink',$symb);
}
if ($deeplink ne '') {
my ($state,$others,$listed,$scope,$protect) = split(/,/,$deeplink);
if (($protect ne 'none') && ($protect ne '')) {
my ($acctype,$item) = split(/:/,$protect);
if ($acctype =~ /lti(c|d)$/) {
unless ($form{'linkprot'} eq $item.$1.':'.$env{'request.deeplink.login'}) {
$disallow = 1;
}
} elsif ($acctype eq 'key') {
unless ($form{'linkkey'} eq $item) {
$disallow = 1;
}
}
}
}
unless ($disallow) {
$env{'request.deeplink.login'} = $form{'firsturl'};
}
} else {
$env{'request.deeplink.login'} = $form{'firsturl'};
}
}
}
if ($disallow) {
return;
}
return 'ok';
}
sub set_retry_token {
my ($form,$lonhost,$querystr) = @_;
if (ref($form) eq 'HASH') {
my ($firsturl,$token,$extras,@names);
@names = ('role','symb','linkprotuser','linkprotexit','linkprot','linkkey','iptoken');
foreach my $name (@names) {
if ($form->{$name} ne '') {
$extras .= '&'.$name.'='.&escape($form->{$name});
last if ($name eq 'linkprot');
}
}
my $firsturl = $form->{'firsturl'};
if (($firsturl ne '') || ($extras ne '')) {
$extras .= ':retry';
$token = &Apache::lonnet::reply('tmpput:'.&escape($firsturl).
$extras,$lonhost);
if (($token eq 'con_lost') || ($token eq 'no_such_host')) {
return 'fail';
} else {
if (ref($querystr)) {
$$querystr = 'retry='.$token;
}
return 'ok';
}
}
}
return;
}
sub check_can_host {
my ($r,$form,$authhost,$domdesc) = @_;
return unless (ref($form) eq 'HASH');
my $canhost = 1;
my $lonhost = $r->dir_config('lonHostID');
my $udom = $form->{'udom'};
my @intdoms;
my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
if (ref($internet_names) eq 'ARRAY') {
@intdoms = @{$internet_names};
}
my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
my $machine_dom = &Apache::lonnet::host_domain($lonhost);
my $hostname = &Apache::lonnet::hostname($lonhost);
my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
my $loncaparev;
if ($authhost eq 'no_account_on_host') {
$loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
} else {
$loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
}
$canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
$udomdefaults{'remotesessions'},
$defdomdefaults{'hostedsessions'});
}
unless ($canhost) {
if ($authhost eq 'no_account_on_host') {
my $checkloginvia = 1;
my ($login_host,$hostname) =
&Apache::lonnet::choose_server($udom,$checkloginvia);
&Apache::loncommon::content_type($r,'text/html');
$r->send_http_header;
if ($login_host ne '') {
my $protocol = $Apache::lonnet::protocol{$login_host};
$protocol = 'http' if ($protocol ne 'https');
my $alias = &Apache::lonnet::use_proxy_alias($r,$login_host);
$hostname = $alias if ($alias ne '');
my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
#FIXME Should preserve where user was going and linkprot by setting ltoken at $login_host
$r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
'<h3>'.&mt('Account creation').'</h3>'.
&mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
'<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
'<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
&Apache::loncommon::end_page());
} else {
$r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
'<h3>'.&mt('Account creation unavailable').'</h3>'.
&mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
'<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
&Apache::loncommon::end_page());
}
} else {
&success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
$form);
if ($form->{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
$env{'request.deeplink.login'} = $form->{'firsturl'};
}
if ($form->{'linkprot'}) {
$env{'request.linkprot'} = $form->{'linkprot'};
} elsif ($form->{'linkkey'} ne '') {
$env{'request.linkkey'} = $form->{'linkkey'};
}
my ($otherserver) = &Apache::lonnet::choose_server($udom);
$r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
}
}
return $canhost;
}
sub noswitch {
my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
'<h3>'.&mt('Session unavailable').'</h3>'.
&mt('This LON-CAPA server is unable to host your session.').'<br />'.
'<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
&Apache::loncommon::end_page();
return $result;
}
sub loginhelpdisplay {
my ($authdomain) = @_;
my $login_help = 1;
my $lang = &Apache::lonlocal::current_language();
if ($login_help) {
my $dom = $authdomain;
if ($dom eq '') {
$dom = &Apache::lonnet::default_login_domain();
}
my %domconfhash = &Apache::loncommon::get_domainconf($dom);
my $loginhelp_url;
if ($lang) {
$loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
if ($loginhelp_url ne '') {
return $loginhelp_url;
}
}
$loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
if ($loginhelp_url ne '') {
return $loginhelp_url;
} else {
return '/adm/loginproblems.html';
}
}
return;
}
sub alternate_unames_check {
my ($uname,$udom) = @_;
my %possunames;
my %domdefs = &Apache::lonnet::get_domain_defaults($udom);
if (ref($domdefs{'unamemap_rule'}) eq 'ARRAY') {
if (@{$domdefs{'unamemap_rule'}} > 0) {
%possunames =
&Apache::lonnet::inst_rulecheck($udom,$uname,undef,
'unamemap',$domdefs{'unamemap_rule'});
}
}
return %possunames;
}
1;
__END__
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