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Include NAR size in fingerprint computation 

This is not strictly needed for integrity (since we already include
the NAR hash in the fingerprint) but it helps against endless data
attacks [1]. (However, this will also require
download-from-binary-cache.pl to bail out if it receives more than the
specified number of bytes.)

[1] https://isis.poly.edu/~jcappos/papers/cappos_mirror_ccs_08.pdf
This commit is contained in:
Eelco Dolstra 2015-02-17 13:16:58 +01:00
parent 8c8750ae66
commit f19b4abfb2
3 changed files with 5 additions and 6 deletions
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2
Makefile
View File

@ -25,7 +25,7 @@ makefiles = \
GLOBAL_CXXFLAGS += -std=c++0x -g -Wall
include Makefile.config
-include Makefile.config
OPTIMIZE = 1

7
perl/lib/Nix/Manifest.pm
View File

@ -377,7 +377,6 @@ EOF
}
# Delete all old manifests downloaded from a given URL.
sub deleteOldManifests {
my ($url, $curUrlFile) = @_;
@ -399,14 +398,14 @@ sub deleteOldManifests {
# signatures. It contains the store path, the SHA-256 hash of the
# contents of the path, and the references.
sub fingerprintPath {
my ($storePath, $narHash, $references) = @_;
my ($storePath, $narHash, $narSize, $references) = @_;
die if substr($storePath, 0, length($Nix::Config::storeDir)) ne $Nix::Config::storeDir;
die if substr($narHash, 0, 7) ne "sha256:";
die if length($narHash) != 59;
foreach my $ref (@{$references}) {
die if substr($ref, 0, length($Nix::Config::storeDir)) ne $Nix::Config::storeDir;
}
return "1;" . $storePath . ";" . $narHash . ";" . join(",", @{$references});
return "1;" . $storePath . ";" . $narHash . ";" . $narSize . ";" . join(",", @{$references});
}
@ -464,7 +463,7 @@ sub parseNARInfo {
}
my $fingerprint = fingerprintPath(
$storePath, $narHash,
$storePath, $narHash, $narSize,
[ map { "$Nix::Config::storeDir/$_" } @refs ]);
if (!checkSignature($publicKey, decode_base64($sig64), $fingerprint)) {

2
scripts/nix-push.in
View File

@ -257,7 +257,7 @@ for (my $n = 0; $n < scalar @storePaths2; $n++) {
chomp $s;
my ($keyName, $secretKey) = split ":", $s;
die "invalid secret key file ‘$secretKeyFile’\n" unless defined $keyName && defined $secretKey;
my $fingerprint = fingerprintPath($storePath, $narHash, $refs);
my $fingerprint = fingerprintPath($storePath, $narHash, $narSize, $refs);
my $sig = encode_base64(signString(decode_base64($secretKey), $fingerprint), "");
$info .= "Sig: $keyName:$sig\n";
}