--- loncom/auth/loncacc.pm	2000/12/26 19:50:25	1.13
+++ loncom/auth/loncacc.pm	2001/05/09 16:57:07	1.16
@@ -2,7 +2,8 @@
 # Cookie Based Access Handler for Construction Area
 # (lonacc: 5/21/99,5/22,5/29,5/31 Gerd Kortemeyer)
 # 6/15,16/11,22/11,
-# 01/06,01/11,6/1,9/25,9/28,11/22,12/25,12/26 Gerd Kortemeyer
+# 01/06,01/11,6/1,9/25,9/28,11/22,12/25,12/26,
+# 01/06/01,05/04,05/05,05/09 Gerd Kortemeyer
 
 package Apache::loncacc;
 
@@ -10,6 +11,29 @@ use strict;
 use Apache::Constants qw(:common :http :methods);
 use Apache::File;
 use CGI::Cookie();
+use Fcntl qw(:flock);
+
+sub constructaccess {
+    my ($url,$ownerdomain)=@_;
+    my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)(\w+)/);
+    unless (($ownername) && ($ownerdomain)) { return ''; }
+
+    if (($ownername eq $ENV{'user.name'}) &&
+        ($ownerdomain eq $ENV{'user.domain'})) {
+	return ($ownername,$ownerdomain);
+    }
+
+    my $capriv='user.priv.ca./'.
+               $ownerdomain.'/'.$ownername.'./'.
+	       $ownerdomain.'/'.$ownername;
+    map {
+        if ($_ eq $capriv) {
+           return ($ownername,$ownerdomain);
+        }
+    } keys %ENV;
+
+    return '';
+}
 
 sub handler {
     my $r = shift;
@@ -22,21 +46,12 @@ sub handler {
         $handle=~s/\W//g;
         my $lonidsdir=$r->dir_config('lonIDsDir');
         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
-            my $ownername=$requrl;
-            $ownername=~s/\/(?:\~|priv\/)(\w+).*/\1/;
-            my $ownerdomain=$r->dir_config('lonDefDomain');
-            my @handleparts=split(/\_/,$handle);
-            my $username=$handleparts[0];
-            my $domain=$handleparts[2];
-            if (($username ne $ownername) || ($domain ne $ownerdomain)) {
-                $r->log_reason
-                   ("$username at $domain not authorized", $r->filename); 
-	        return HTTP_NOT_ACCEPTABLE;
-            }
             my @profile;
 	    {
              my $idf=Apache::File->new("$lonidsdir/$handle.id");
+             flock($idf,LOCK_SH);
              @profile=<$idf>;
+             $idf->close();
 	    }
             my $envi;
             for ($envi=0;$envi<=$#profile;$envi++) {
@@ -48,6 +63,11 @@ sub handler {
             $ENV{'request.state'}    = "construct";
             $ENV{'request.filename'} = $r->filename;
 
+            unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) {
+                $r->log_reason("Unauthorized $requrl", $r->filename); 
+	        return HTTP_NOT_ACCEPTABLE;
+            }
+
 # -------------------------------------------------------- Load POST parameters