* Basic blacklist checker. Each element in a user environment is

checked against every item in a blacklist.
This commit is contained in:
Eelco Dolstra 2005-03-04 11:12:48 +00:00
parent 4bbdcfbb45
commit 9a7f95882c
2 changed files with 122 additions and 3 deletions

View file

@ -16,13 +16,25 @@
<item id='zlib-1.2.1-security'>
<condition>
<containsSource
hash="sha256:0yp7z8ask4b8m2ia253apnnxdk0z0zrs70yr079m2rjd4297chgv"
origin="zlib-1.2.1.tar.gz" />
<!--
<or>
<containsSource
hash="sha256:0yp7z8ask4b8m2ia253apnnxdk0z0zrs70yr079m2rjd4297chgv"
origin="zlib-1.2.1.tar.gz" />
<and>
<containsSource
hash="sha256:0yp7z8ask4b8m2ia253apnnxdk0z0zrs70yr079m2rjd4297chgv"
origin="zlib-1.2.1.tar.gz" />
<not>
<containsSource
hash="..."
origin="zlib-1.2.1-dos.patch" />
</not>
</and>
<containsOutput
name="/nix/store/gxbdsvlwz6ixin94jhdw7rwdbb5mxxq3-zlib-1.2.1" />
</or>
-->
</condition>
<reason>
Zlib 1.2.1 is vulnerable to a denial-of-service condition. See

107
blacklisting/check-env.pl Executable file
View file

@ -0,0 +1,107 @@
#! /usr/bin/perl -w
use strict;
use XML::Simple;
my $blacklistFN = shift @ARGV;
die unless defined $blacklistFN;
my $userEnv = shift @ARGV;
die unless defined $userEnv;
# Read the blacklist.
my $blacklist = XMLin($blacklistFN,
forcearray => [qw()],
keyattr => ['id'],
suppressempty => '');
# Get all the elements of the user environment.
my $userEnvElems = `nix-store --query --references '$userEnv'`;
die "cannot query user environment elements" if $? != 0;
my @userEnvElems = split ' ', $userEnvElems;
my %storePathHashes;
# Function for evaluating conditions.
sub evalCondition {
my $storePaths = shift;
my $condition = shift;
if (defined $condition->{'containsSource'}) {
my $c = $condition->{'containsSource'};
my $hash = $c->{'hash'};
foreach my $path (keys %{$storePathHashes{$hash}}) {
# !!! use a hash for $storePaths
foreach my $path2 (@{$storePaths}) {
return 1 if $path eq $path2;
}
}
return 0;
}
return 0;
}
# Iterate over all elements, check them.
foreach my $userEnvElem (@userEnvElems) {
# Get the deriver of this path.
my $deriver = `nix-store --query --deriver '$userEnvElem'`;
die "cannot query deriver" if $? != 0;
chomp $deriver;
if ($deriver eq "unknown-deriver") {
# print " deriver unknown, cannot check sources\n";
next;
}
print "CHECKING $userEnvElem\n";
# Get the requisites of the deriver.
my $requisites = `nix-store --query --requisites --include-outputs '$deriver'`;
die "cannot query requisites" if $? != 0;
my @requisites = split ' ', $requisites;
# Get the hashes of the requisites.
my $hashes = `nix-store --query --hash @requisites`;
die "cannot query hashes" if $? != 0;
my @hashes = split ' ', $hashes;
for (my $i = 0; $i < scalar @requisites; $i++) {
die unless $i < scalar @hashes;
my $hash = $hashes[$i];
$storePathHashes{$hash} = {} unless defined $storePathHashes{$hash};
my $r = $storePathHashes{$hash}; # !!! fix
$$r{$requisites[$i]} = 1;
}
# Evaluate each blacklist item.
foreach my $itemId (sort (keys %{$blacklist->{'item'}})) {
# print " CHECKING FOR $itemId\n";
my $item = $blacklist->{'item'}->{$itemId};
die unless defined $item;
my $condition = $item->{'condition'};
die unless defined $condition;
# Evaluate the condition.
if (evalCondition(\@requisites, $condition)) {
# Oops, condition triggered.
my $reason = $item->{'reason'};
$reason =~ s/\s+/ /g;
$reason =~ s/^\s+//g;
print " VULNERABLE TO `$itemId': $reason\n";
}
}
}