--- loncom/auth/lonauth.pm	2014/12/05 12:03:20	1.136
+++ loncom/auth/lonauth.pm	2018/04/14 02:30:11	1.150
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # User Authentication Module
 #
-# $Id: lonauth.pm,v 1.136 2014/12/05 12:03:20 kruse Exp $
+# $Id: lonauth.pm,v 1.150 2018/04/14 02:30:11 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -29,24 +29,24 @@
 package Apache::lonauth;
 
 use strict;
-use LONCAPA;
+use LONCAPA qw(:DEFAULT :match);
 use Apache::Constants qw(:common);
 use CGI qw(:standard);
-use DynaLoader; # for Crypt::DES version
-use Crypt::DES;
 use Apache::loncommon();
 use Apache::lonnet;
 use Apache::lonmenu();
 use Apache::createaccount;
+use Apache::ltiauth;
 use Fcntl qw(:flock);
 use Apache::lonlocal;
 use Apache::File();
 use HTML::Entities;
+use Digest::MD5;
  
 # ------------------------------------------------------------ Successful login
 sub success {
     my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
-	$form) = @_;
+	$form,$skipcritical) = @_;
 
 # ------------------------------------------------------------ Get cookie ready
     my $cookie =
@@ -65,18 +65,60 @@ sub success {
 
 # ------------------------------------------------- Check for critical messages
 
-    my @what=&Apache::lonnet::dump('critical',$domain,$username);
-    if ($what[0]) {
-	if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
-	    $lowerurl='/adm/email?critical=display';
+    unless ($skipcritical) {
+        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=/";
+# ----------------------------------------------------------- Get cookies ready
+    my ($securecookie,$defaultcookie);
+    if ($ENV{'SERVER_PORT'} == 443) {
+        $securecookie="lonID=$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' => "$lonidsdir/$linkname.id"});
+            }
+        }
+    } else {
+        $defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
+    }
 # -------------------------------------------------------- Menu script and info
     my $destination = $lowerurl;
-
+    if ($env{'request.lti.login'}) {
+        if (($env{'request.lti.reqcrs'}) && ($env{'request.lti.reqrole'} eq 'cc')) {
+            &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);
+            }
+            $r->send_http_header;
+            &Apache::ltiauth::lti_reqcrs($r,$domain,$form,$username,$domain);
+            return;
+        }
+        if ($env{'request.lti.selfenrollrole'}) {
+            if (&Apache::ltiauth::lti_enroll($username,$domain,
+                                             $env{'request.lti.selfenrollrole'}) eq 'ok') {
+                $form->{'role'} = $env{'request.lti.selfenrollrole'};
+                &Apache::lonnet::delenv('request.lti.selfenrollrole');
+            } else {
+                &Apache::ltiauth::invalid_request($r,24);
+            }
+        }
+    }
     if (defined($form->{role})) {
         my $envkey = 'user.role.'.$form->{role};
         my $now=time;
@@ -103,9 +145,7 @@ sub success {
         if ($destsymb =~ /___/) {
             # FIXME Need to deal with encrypted symbs and urls as needed.
             my ($map,$resid,$desturl)=split(/___/,$destsymb);
-            unless ($desturl=~/^(adm|editupload|public)/) {
-                $desturl = &Apache::lonnet::clutter($desturl);
-            }
+            $desturl = &Apache::lonnet::clutter($desturl);
             $desturl = &HTML::Entities::encode($desturl,'"<>&');
             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
             $destination .= 'destinationurl='.$desturl.
@@ -120,22 +160,54 @@ sub success {
         $destination .= 'source=login';
     }
 
-    my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
+    my $windowname = 'loncapaclient';
+    if ($env{'request.lti.login'}) {
+        $windowname .= 'lti';
+    }
+    my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="'.$windowname.'";');
     my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
     my $brcrum = [{'href' => '',
                    'text' => 'Successful Login'},];
-    my $start_page=&Apache::loncommon::start_page('Successful Login',
-                                                  $header,
-                                                  {'bread_crumbs' => $brcrum,});
-    my $end_page  =&Apache::loncommon::end_page();
+    my $args = {'bread_crumbs' => $brcrum,};
+    unless ((defined($form->{role})) || (defined($form->{symb}))) {
+        my $update=$env{'user.update.time'};
+        if (!$update) {
+            $update = $env{'user.login.time'};
+        }
+        my %roles_in_env;
+        my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
+        if ($showcount == 1) {
+            foreach my $rolecode (keys(%roles_in_env)) {
+                my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
+                if ($cid) {
+                    my %coursedescription =
+                        &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
+                    if ($coursedescription{'type'} eq 'Placement') {
+                        $args->{'crstype'} = 'Placement';
+                    }
+                    last;
+                }
+            }
+        }
+    }
 
-	my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
 # ------------------------------------------------- Output for successful login
 
     &Apache::loncommon::content_type($r,'text/html');
-    $r->header_out('Set-cookie' => $cookie);
+    if ($securecookie) {
+        $r->headers_out->add('Set-cookie' => $securecookie);
+    }
+    if ($defaultcookie) {
+        $r->headers_out->add('Set-cookie' => $defaultcookie);
+    }
     $r->send_http_header;
 
+    my $start_page=&Apache::loncommon::start_page('Successful Login',
+                                                  $header,$args);
+    my $end_page  =&Apache::loncommon::end_page();
+
+    my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
+
     my %lt=&Apache::lonlocal::texthash(
 				       'wel' => 'Welcome',
 				       'pro' => 'Login problems?',
@@ -230,7 +302,6 @@ sub reroute {
 sub handler {
     my $r = shift;
     my $londocroot = $r->dir_config('lonDocRoot');
-    my $form;
 # Are we re-routing?
     if (-e "$londocroot/lon-status/reroute.txt") {
 	&reroute($r);
@@ -294,10 +365,11 @@ sub handler {
 
 # split user logging in and "su"-user
 
-    ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
+    ($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'});
+    $form{'udom'}  = &LONCAPA::clean_domain($form{'udom'});
+    $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
 
     my $role   = $r->dir_config('lonRole');
     my $domain = $r->dir_config('lonDefDomain');
@@ -309,12 +381,6 @@ sub handler {
     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
                                       $form{'serverid'});
 
-    my %sessiondata;
-    if ($form{'iptoken'}) {
-        %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
-        my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
-    }
-
     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);
@@ -334,22 +400,28 @@ sub handler {
         return OK;
     }
 
-    my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
+    my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
     if ($rolestr) {
         $rolestr = &unescape($rolestr);
     }
     if ($symbstr) {
         $symbstr= &unescape($symbstr);
     }
+    if ($iptokenstr) {
+        $iptokenstr = &unescape($iptokenstr);
+    }
     if ($rolestr =~ /^role=/) {
         (undef,$form{'role'}) = split('=',$rolestr);
     }
     if ($symbstr =~ /^symb=/) { 
         (undef,$form{'symb'}) = split('=',$symbstr);
     }
+    if ($iptokenstr =~ /^iptoken=/) {
+        (undef,$form{'iptoken'}) = split('=',$iptokenstr);
+    }
 
-    my $upass = $ENV{HTTPS} ? join("", @form{qw(upass0 upass1 upass2)}) 
-        : decrypt($key, @form{qw(upass0 upass1 upass2)});
+    my $upass = $ENV{HTTPS} ? $form{'upass0'} 
+        : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
 
 # ---------------------------------------------------------------- Authenticate
 
@@ -366,7 +438,7 @@ sub handler {
     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
                                               $form{'udom'},$defaultauth,
                                               $clientcancheckhost);
-    
+
 # --------------------------------------------------------------------- Failed?
 
     if ($authhost eq 'no_host') {
@@ -412,6 +484,8 @@ sub handler {
 
     my $hosthere;
     if ($form{'iptoken'}) {
+        my %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;
@@ -420,20 +494,68 @@ sub handler {
 
 # --------------------------------- 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'},$form{'udom'})) {
+	if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
 # ---------------------------------------------------- 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'}));
+	    unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
 # ------------------------------ see if the su-user is not too highly privileged
-		unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
+		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 '.$form{'udom'}.
-			' logging in as '.$form{'suname'});
-		    $form{'uname'}=$form{'suname'};
-		} else {
-		    &Apache::lonnet::logthis('Attempted switch user to privileged user');
+
+		            &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 {
@@ -445,13 +567,25 @@ sub handler {
 
     unless ($hosthere) {
         ($is_balancer,$otherserver) =
-            &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
+            &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
+        if ($is_balancer) {
+            if ($otherserver eq '') {
+                my $lowest_load;
+                ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
+                if ($lowest_load > 100) {
+                    $otherserver = &Apache::lonnet::spareserver($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 ($is_balancer) {
-        if (!$otherserver) { 
-            ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
-        }
+    if (($is_balancer) && (!$hosthere)) {
         if ($otherserver) {
             &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                      \%form);
@@ -519,40 +653,15 @@ sub handler {
                 return OK;
             }
         }
+        if (($is_balancer) && ($hosthere)) {
+            $form{'noloadbalance'} = $hosthere;
+        }
         &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
                  \%form);
         return OK;
     }
 }
 
-sub decrypt {
-    my ($key, @chunks) = @_;
-
-    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 =
-            $cipher->decrypt(
-                unpack("a8",pack("H16",substr($chunks[$i],0,16))));
-
-        $chunk .=
-            $cipher->decrypt(
-                unpack("a8",pack("H16",substr($chunks[$i],16,16))));
-
-        $chunk = substr($chunk,1,ord(substr($chunk,0,1)));
-        $upass .= $chunk;
-    }
-    return $upass;
-}
-
 sub check_can_host {
     my ($r,$form,$authhost,$domdesc) = @_;
     return unless (ref($form) eq 'HASH');