--- loncom/auth/lonauth.pm	1999/10/13 17:48:52	1.1
+++ loncom/auth/lonauth.pm	2008/03/24 05:23:10	1.90
@@ -1,120 +1,360 @@
 # The LearningOnline Network
 # User Authentication Module
-# 5/21/99,5/22,5/25,5/26,5/27,5/29,6/2,6/11,6/14,6/15 Gerd Kortemeyer
+#
+# $Id: lonauth.pm,v 1.90 2008/03/24 05:23:10 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;
 use Apache::Constants qw(:common);
-use Apache::File;
 use CGI qw(:standard);
-use CGI::Cookie();
-use Apache::lonnet();
-
+use DynaLoader; # for Crypt::DES version
+use Crypt::DES;
+use Apache::loncommon();
+use Apache::lonnet;
+use Apache::lonmenu();
+use Apache::createaccount;
+use Fcntl qw(:flock);
+use Apache::lonlocal;
+ 
 # ------------------------------------------------------------ Successful login
-
 sub success {
-    my ($r, $lowerurl, $username, $domain, $authhost) = @_;
-    my $lonids=$r->dir_config('lonIDsDir');
-# See if old ID present, but overlooked
-    my $cookie;
-    if ($cookie=<$lonids/$username\_*\_$domain\_$authhost.id>) {
-	$cookie=~s/\.id//;
-        $cookie=~s/$lonids\///;
-    } else {
-        my $now=time;
-        $cookie="$username\_$now\_$domain\_$authhost";
-        {
-	    my $idf=Apache::File->new(">$lonids/$cookie.id");
-            print $idf "Name: $username\n";
+    my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
+	$form) = @_;
+
+# ------------------------------------------------------------ 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 $cookie; }
+
+# -------------------------------------------------------------------- Log this
+
+    &Apache::lonnet::log($domain,$username,$authhost,
+                         "Login $ENV{'REMOTE_ADDR'}");
+
+# ------------------------------------------------- Check for critical messages
+
+    my @what=&Apache::lonnet::dump('critical',$domain,$username);
+    if ($what[0]) {
+	if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
+	    $lowerurl='/adm/email?critical=display';
         }
     }
+
+# ------------------------------------------------------------ Get cookie ready
     $cookie="lonID=$cookie; path=/";
-    $r->send_cgi_header(<<ENDHEADER);
-Content-type: text/html
-Set-cookie: $cookie
+# -------------------------------------------------------- Menu script and info
+    my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});
+    my $startupremote=&Apache::lonmenu::startupremote($lowerurl);
+    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,
+						  {'no_inline_link' => 1,});
+    my $end_page  =&Apache::loncommon::end_page();
+
+    my $continuelink;
+    if (($env{'browser.interface'} eq 'textual') ||
+        ($env{'environment.remote'} eq 'off')) {
+	$continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";
+    }
+# ------------------------------------------------- Output for successful login
 
-ENDHEADER
+    &Apache::loncommon::content_type($r,'text/html');
+    $r->header_out('Set-cookie' => $cookie);
+    $r->send_http_header;
+
+    my %lt=&Apache::lonlocal::texthash(
+				       'wel' => 'Welcome',
+				       'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',
+				       'pro' => 'Problems',
+				       'log' => 'loginproblems.html',
+				       );
     $r->print(<<ENDSUCCESS);
-<html>
-<head>
-<title>Successful Login to the LearningOnline Network</title>
-</head>
-<frameset rows="80,*" border=0>
-<frame scrolling="no" name="loncontrol" src="/adm/menu">
-<frame name="loncontent" src="$lowerurl">
-</frameset>
-</html>
+$start_page
+$setflags
+$windowinfo
+<h1>$lt{'wel'}</h1>
+$lt{'mes'}.<p>
+<a href="/adm/$lt{'log'}">$lt{'pro'}?</a></p>
+$remoteinfo
+$maincall
+$continuelink
+$end_page
 ENDSUCCESS
 }
 
 # --------------------------------------------------------------- Failed login!
 
 sub failed {
-    my ($r,$message) = @_;
-    $r->send_cgi_header(<<ENDFHEADER);
-Content-type: text/html
+    my ($r,$message,$form) = @_;
+    my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,
+						    {'no_inline_link' => 1,});
+    my $end_page   = &Apache::loncommon::end_page();
+
+    $message = &mt($message);
+    my %lt=('sorry'  => &mt('Sorry ...'),
+	    'please' => 
+	    &mt('Please [_1]log in again[_2].',
+		"<a href=\"/adm/login?username=$form->{'uname'}&domain=$form->{'udom'}\">",
+		'</a>'),
+	    'problemspage' => &mt('loginproblems.html'),
+	    'problems'     => 'Problems',
+	    );
+    &Apache::loncommon::content_type($r,'text/html');
+    $r->send_http_header;
 
-ENDFHEADER
     $r->print(<<ENDFAILED);
-<html>
-<head>
-<title>Unsuccessful Login to the LearningOnline Network</title>
-</head>
-<html>
-<body bgcolor="#FFFFFF">
-<h1>Sorry ...</h1>
-<h2>$message to use the Learning<i>Online</i> Network</h2>
-</body>
-</html>
+$start_page
+<h1>$lt{'sorry'}</h1>
+<p><b>$message</b></p>
+<p>$lt{'please'}</p>
+<p>
+<a href="/adm/$lt{'problemspage'}">$lt{'problems'}</a></p>
+$end_page
 ENDFAILED
 }
 
+# ------------------------------------------------------------------ Rerouting!
+
+sub reroute {
+    my ($r) = @_;
+    &Apache::loncommon::content_type($r,'text/html');
+    $r->send_http_header;
+    my $msg='<h1>Sorry ...</h1>
+             Please <a href="/">log in again</a>.';
+    &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
+}
+
 # ---------------------------------------------------------------- Main handler
 
 sub handler {
     my $r = shift;
+    my $form;
+# Are we re-routing?
+    if (-e '/home/httpd/html/lon-status/reroute.txt') {
+	&reroute($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 ($handle ne '') {
+# Indeed, a valid token is found
+	&Apache::loncommon::content_type($r,'text/html');
+	$r->send_http_header;
+	my $start_page = 
+	    &Apache::loncommon::start_page('Already logged in');
+	my $end_page = 
+	    &Apache::loncommon::end_page();
+	$r->print(<<ENDFAILED);
+$start_page
+<h1>You are already logged in</h1>
+<p>Please either <a href="/adm/roles">continue the current session</a> or
+<a href="/adm/logout">logout</a>.</p>
+<p>
+<a href="/adm/loginproblems.html">Problems?</a></p>
+$end_page
+ENDFAILED
+       return OK;
+    }
+
+# ---------------------------------------------------- No valid token, continue
+
 
     my $buffer;
-    $r->read($buffer,$r->header_in('Content-length'));
-    my @pairs=split(/&/,$buffer);
-    my $pair; my $name; my $value; my %FORM;
-    foreach $pair (@pairs) {
-       ($name,$value) = split(/=/,$pair);
-       $FORM{$name}=$value;
+    if ($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;
     } 
 
-    if ((!$FORM{'uname'}) || (!$FORM{'upass'}) || (!$FORM{'udom'})) {
-	failed($r,'Username, password and domain need to be specified');
+    if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
+	&failed($r,'Username, password and domain need to be specified.',
+		\%form);
         return OK;
     }
-    $FORM{'uname'} =~ s/\W//g;
-    $FORM{'upass'} =~ s/\W//g;
-    $FORM{'udom'}  =~ s/\W//g;
+
+# split user logging in and "su"-user
+
+    ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
+    $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
+    $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
+    $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
 
     my $role   = $r->dir_config('lonRole');
     my $domain = $r->dir_config('lonDefDomain');
     my $prodir = $r->dir_config('lonUsersDir');
 
+# ---------------------------------------- Get the information from login token
+
+    my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
+                                      $form{'serverid'});
+
+    if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
+	&failed($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 ". $form{'serverid'}." to get login token");
+	    return OK;
+	}
+    }
+    my ($key,$firsturl)=split(/&/,$tmpinfo);
+
+    my $keybin=pack("H16",$key);
+
+    my $cipher;
+    if ($Crypt::DES::VERSION>=2.03) {
+	$cipher=new Crypt::DES $keybin;
+    }
+    else {
+	$cipher=new DES $keybin;
+    }
+    my $upass='';
+    for (my $i=0;$i<=2;$i++) {
+	my $chunk=
+	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
+
+	$chunk.=
+	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
+
+	$chunk=substr($chunk,1,ord(substr($chunk,0,1)));
+	$upass.=$chunk;
+    }
+
 # ---------------------------------------------------------------- Authenticate
-    my $authhost=Apache::lonnet::authenticate($FORM{'uname'},
-                                              $FORM{'upass'},
-                                              $FORM{'udom'});
+    my $cancreate; 
+    my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
+    if (ref($domconfig{'usercreation'}) eq 'HASH') {
+        if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {
+            if ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') {
+                $cancreate = $domconfig{'usercreation'}{'cancreate'}{'selfcreate'};
+            }
+        }
+    }
+    my $defaultauth;
+    if ($cancreate eq 'any' || $cancreate eq 'login') {  
+        $defaultauth = 1;
+    }
+    my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
+                                              $form{'udom'},$defaultauth);
     
 # --------------------------------------------------------------------- Failed?
 
     if ($authhost eq 'no_host') {
-	failed($r,'Username and/or password could not be authenticated');
+	&failed($r,'Username and/or password could not be authenticated.',
+		\%form);
         return OK;
+    } elsif ($authhost eq 'no_account_on_host') {
+        my $cancreate;
+        my %domconfig = 
+            &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
+        if (ref($domconfig{'usercreation'}) eq 'HASH') {
+            if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {
+                if ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') {
+                    $cancreate = $domconfig{'usercreation'}{'cancreate'}{'selfcreate'};
+                }
+            }
+        }
+        if ($cancreate eq 'any' || $cancreate eq 'login') {
+            my $start_page = 
+                &Apache::loncommon::start_page('Create a user account in LON-CAPA',
+                                               '',{'no_inline_link'   => 1,});
+            my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
+            my $output = &Apache::createaccount::username_check($form{'uname'},
+                                                                $form{'udom'},$domdesc);
+            &Apache::loncommon::content_type($r,'text/html');
+            $r->send_http_header;
+            &Apache::createaccount::print_header($r,$start_page);
+            $r->print($output);
+            $r->print(&Apache::loncommon::end_page());
+            return OK;
+        } else {
+            &failed($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;
+        }
     }
 
-    my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
-    my $lonurl=$cookies{'lonURL'};
-    if (!$lonurl) { failed($r,'Cookies need to be activated'); return OK; }
-    my $lowerurl=$lonurl->value;
+    if (($firsturl eq '') || 
+	($firsturl=~/^\/adm\/(logout|remote)/)) {
+	$firsturl='/adm/roles';
+    }
+# --------------------------------- Are we attempting to login as somebody else?
+    if ($form{'suname'}) {
+# ------------ see if the original user has enough privileges to pull this stunt
+	if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
+# ---------------------------------------------------- see if the su-user exists
+	    unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
+		eq 'no_host') {
+		&Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
+# ------------------------------ see if the su-user is not too highly privileged
+		unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
+# -------------------------------------------------------- actually switch users
+		    &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
+			' logging in as '.$form{'suname'});
+		    $form{'uname'}=$form{'suname'};
+		} else {
+		    &Apache::lonnet::logthis('Attempted switch user to privileged user');
+		}
+	    }
+	} else {
+	    &Apache::lonnet::logthis('Non-privileged user attempting switch user');
+	}
+    }
 
-    success($r,$lowerurl,$FORM{'uname'},$FORM{'udom'},$authhost);
+    if ($r->dir_config("lonBalancer") eq 'yes') {
+	&success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
+		 \%form);
+	$r->internal_redirect('/adm/switchserver');
+    } else {
+	&success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
+		 \%form);
+    }
     return OK;
 }
 
 1;
 __END__
+
+