Bug 419014: (CVE-2010-3764) [SECURITY] Old charts are not project specific, and product names are viewable in graphs/

r=wurblzap a=LpSolit

1 files changed, 52 insertions, 70 deletions

diff --git a/reports.cgi b/reports.cgi
index fd84f5330..01bbb50c7 100755
--- a/reports.cgi
+++ b/reports.cgi
@@ -38,31 +38,28 @@ use Bugzilla::Util;
 use Bugzilla::Error;
 use Bugzilla::Status;
 
+use File::Basename;
+use Digest::MD5 qw(md5_hex);
+
 # If we're using bug groups for products, we should apply those restrictions
 # to viewing reports, as well.  Time to check the login in that case.
 my $user = Bugzilla->login();
+my $cgi = Bugzilla->cgi;
+my $template = Bugzilla->template;
+my $vars = {};
 
 if (!Bugzilla->feature('old_charts')) {
     ThrowCodeError('feature_disabled', { feature => 'old_charts' });
 }
 
 my $dir       = bz_locations()->{'datadir'} . "/mining";
-my $graph_url = 'graphs';
-my $graph_dir = bz_locations()->{'libpath'} . '/' .$graph_url;
+my $graph_dir = bz_locations()->{'graphsdir'};
+my $graph_url = basename($graph_dir);
+my $product_name = $cgi->param('product') || '';
 
 Bugzilla->switch_to_shadow_db();
 
-my $cgi = Bugzilla->cgi;
-my $template = Bugzilla->template;
-my $vars = {};
-
-# We only want those products that the user has permissions for.
-my @myproducts;
-push( @myproducts, "-All-");
-# Extract product names from objects and add them to the list.
-push( @myproducts, map { $_->name } @{$user->get_selectable_products} );
-
-if (! defined $cgi->param('product')) {
+if (!$product_name) {
     # Can we do bug charts?
     (-d $dir && -d $graph_dir) 
       || ThrowCodeError('chart_dir_nonexistent',
@@ -80,49 +77,61 @@ if (! defined $cgi->param('product')) {
         push(@datasets, $datasets);
     }
 
+    # We only want those products that the user has permissions for.
+    my @myproducts = ('-All-');
+    # Extract product names from objects and add them to the list.
+    push( @myproducts, map { $_->name } @{$user->get_selectable_products} );
+
     $vars->{'datasets'} = \@datasets;
     $vars->{'products'} = \@myproducts;
 
     print $cgi->header();
-
-    $template->process('reports/old-charts.html.tmpl', $vars)
-      || ThrowTemplateError($template->error());
-    exit;
 }
 else {
-    my $product = $cgi->param('product');
-
     # For security and correctness, validate the value of the "product" form variable.
     # Valid values are those products for which the user has permissions which appear
     # in the "product" drop-down menu on the report generation form.
-    grep($_ eq $product, @myproducts)
-      || ThrowUserError("invalid_product_name", {product => $product});
+    my ($product) = grep { $_->name eq $product_name } @{$user->get_selectable_products};
+    ($product || $product_name eq '-All-')
+      || ThrowUserError('invalid_product_name', {product => $product_name});
 
-    # We've checked that the product exists, and that the user can see it
-    # This means that is OK to detaint
-    trick_taint($product);
+    # Product names can change over time. Their ID cannot; so use the ID
+    # to generate the filename.
+    my $prod_id = $product ? $product->id : 0;
 
-    defined($cgi->param('datasets')) || ThrowUserError('missing_datasets');
+    # Make sure there is something to plot.
+    my @datasets = $cgi->param('datasets');
+    scalar(@datasets) || ThrowUserError('missing_datasets');
 
-    my $datasets = join('', $cgi->param('datasets'));
+    if (grep { $_ !~ /^[A-Za-z0-9:_-]+$/ } @datasets) {
+        ThrowUserError('invalid_datasets', {'datasets' => \@datasets});
+    }
 
-    my $data_file = daily_stats_filename($product);
-    my $image_file = chart_image_name($data_file, $datasets);
-    my $url_image = correct_urlbase() . "$graph_url/$image_file";
+    # Filenames must not be guessable as they can point to products
+    # you are not allowed to see. Also, different projects can have
+    # the same product names.
+    my $key = Bugzilla->localconfig->{'site_wide_secret'};
+    my $project = bz_locations()->{'project'} || '';
+    my $image_file =  join(':', ($key, $project, $prod_id, @datasets));
+    # Wide characters cause md5_hex() to die.
+    if (Bugzilla->params->{'utf8'}) {
+        utf8::encode($image_file) if utf8::is_utf8($image_file);
+    }
+    $image_file = md5_hex($image_file) . '.png';
+    trick_taint($image_file);
 
     if (! -e "$graph_dir/$image_file") {
-        generate_chart("$dir/$data_file", "$graph_dir/$image_file", $product, $datasets);
+        generate_chart($dir, "$graph_dir/$image_file", $product, \@datasets);
     }
 
-    $vars->{'url_image'} = $url_image;
+    $vars->{'url_image'} = "$graph_url/$image_file";
 
     print $cgi->header(-Content_Disposition=>'inline; filename=bugzilla_report.html');
-
-    $template->process('reports/old-charts.html.tmpl', $vars)
-      || ThrowTemplateError($template->error());
-    exit;
 }
 
+$template->process('reports/old-charts.html.tmpl', $vars)
+  || ThrowTemplateError($template->error());
+
 #####################
 #    Subroutines    #
 #####################
@@ -131,9 +140,8 @@ sub get_data {
     my $dir = shift;
 
     my @datasets;
-    my $datafile = daily_stats_filename('-All-');
-    open(DATA, '<', "$dir/$datafile")
-      || ThrowCodeError('chart_file_open_fail', {filename => "$dir/$datafile"});
+    open(DATA, '<', "$dir/-All-")
+      || ThrowCodeError('chart_file_open_fail', {filename => "$dir/-All-"});
 
     while (<DATA>) {
         if (/^# fields?: (.+)\s*$/) {
@@ -145,38 +153,12 @@ sub get_data {
     return @datasets;
 }
 
-sub daily_stats_filename {
-    my ($prodname) = @_;
-    $prodname =~ s/\//-/gs;
-    return $prodname;
-}
-
-sub chart_image_name {
-    my ($data_file, $datasets) = @_;
-
-    # This routine generates a filename from the requested fields. The problem
-    # is that we have to check the safety of doing this. We can't just require
-    # that the fields exist, because what stats were collected could change
-    # over time (eg by changing the resolutions available)
-    # Instead, just require that each field name consists only of letters,
-    # numbers, underscores and hyphens.
-
-    if ($datasets !~ m/^[A-Za-z0-9:_-]+$/) {
-        ThrowUserError('invalid_datasets', {'datasets' => $datasets});
-    }
-
-    # Since we pass the tests, consider it OK
-    trick_taint($datasets);
-
-    # Cache charts by generating a unique filename based on what they
-    # show. Charts should be deleted by collectstats.pl nightly.
-    my $id = join ("_", split (":", $datasets));
-
-    return "${data_file}_${id}.png";
-}
-
 sub generate_chart {
-    my ($data_file, $image_file, $product, $datasets) = @_;
+    my ($dir, $image_file, $product, $datasets) = @_;
+    $product = $product ? $product->name : '-All-';
+    my $data_file = $product;
+    $data_file =~ s/\//-/gs;
+    $data_file = $dir . '/' . $data_file;
 
     if (! open FILE, $data_file) {
         if ($product eq '-All-') {
@@ -187,7 +169,7 @@ sub generate_chart {
 
     my @fields;
     my @labels = qw(DATE);
-    my %datasets = map { $_ => 1 } split /:/, $datasets;
+    my %datasets = map { $_ => 1 } @$datasets;
 
     my %data = ();
     while (<FILE>) {