--- loncom/Attic/lchtmldir	2005/04/07 22:27:52	1.16
+++ loncom/Attic/lchtmldir	2007/08/22 19:03:04	1.19
@@ -41,7 +41,7 @@
 #    NSCL
 #    Michigan State University8
 #    East Lansing, MI 48824-1321
-
+#
 #   General flow of control:
 #   1. Validate process state (must be run as www).
 #   2. Validate parameters:  Need two parameters:
@@ -61,7 +61,7 @@
 #       - internal - www:www/2775
 #       - local    - www:www/2775
 #
-
+#
 #
 #   Take a few precautions to be sure that we're not vulnerable to trojan
 #   horses and other fine issues:
@@ -70,6 +70,8 @@ use strict;
 use Fcntl qw(:mode);
 use DirHandle;
 use POSIX;
+use lib '/home/httpd/lib/perl/';
+use LONCAPA qw(:match);
 
 $ENV{'PATH'} = '/bin:/usr/bin:/usr/local/sbin:/home/httpd/perl';
 delete @ENV{qw{IFS CDPATH ENV BASH_ENV}};
@@ -132,7 +134,7 @@ if( $authentication ne "unix:"     &&
 
 # Untaint the username.
 
-my $match = $username =~ /^(\w+)$/;
+my $match = $username =~ /^($match_username)$/;
 my $patt  = $1;
  
 if($DEBUG) {
@@ -144,7 +146,7 @@ my $safeuser = $patt;
 if($DEBUG) {
     print("Save username = $safeuser \n");
 }
-if(($username ne $safeuser) or ($safeuser!~/^[A-z]/)) {
+if($username ne $safeuser) {
     if($DEBUG) {
 	print("User name $username had illegal characters\n");
     }
@@ -154,32 +156,30 @@ if(($username ne $safeuser) or ($safeuse
 #untaint the base directory require that the dir contain only 
 # alphas, / numbers or underscores, and end in /$safeuser
 
-$dir =~ /(^([\w\/]+))/;
 
-my $dirtry1 = $1;
 
-$dir =~ /$\/$safeuser/;
-my $dirtry2 = $1;
+my ($allowed_dir) = ($dir =~ m{(^([/]|$match_username)+)});
+
+my $has_correct_end = ($dir =~ m{/\Q$safeuser\E$});
 
-if(($dirtry1 ne $dir) or ($dirtry2 ne $dir)) {
+if(($allowed_dir ne $dir) or (!$has_correct_end)) {
     if ($DEBUG) {
 	print("Directory $dir is not a valid home for $safeuser\n");
     }
     exit 5;
 }
 
-
 # As root, create the directory.
 
-my $homedir = $dirtry1;
+my $homedir = $allowed_dir;
 my $fulldir = $homedir."/public_html";
 
 if($DEBUG) {
     print("Full directory path is: $fulldir \n");
 }
-if(!( -e $dirtry1)) {
+if(!( -e $homedir)) {
     if($DEBUG) {
-	print("User's home directory $dirtry1 does not exist\n");
+	print("User's home directory $homedir does not exist\n");
     }
     if ($authentication eq "unix:") {
         exit 6;
@@ -196,8 +196,17 @@ if ($authentication eq "unix:") {
     }
 }
 
+
+
 &EnableRoot;
 
+#  If authentication is internal and the top level directory exists
+#  give it the right permissions (in case this is a modification.
+
+if ($authentication eq "internal:") {
+    chmod(0711, $homedir);	# so www can enter ~/public_html.
+}
+
 &System("/bin/mkdir -p $fulldir")   unless (-e $fulldir);
     unless(-e $fulldir."/index.html") {
 	open OUT,">".$fulldir."/index.html";