X-Git-Url: https://git.dogcows.com/gitweb?p=chaz%2Fp5-File-KDBX;a=blobdiff_plain;f=lib%2FFile%2FKDBX%2FKey%2FFile.pm;h=5c7cb12645d2f3bdd7f763924eb004f8f5d4bef7;hp=be9abd283538e0095cbb398eae73f5490991e3ba;hb=1b913e5c8826cae2355b0076ec5701aa3ce63c63;hpb=b30990a507ef30b6f5b6fcb799a2759632c77ff0
diff --git a/lib/File/KDBX/Key/File.pm b/lib/File/KDBX/Key/File.pm
index be9abd2..5c7cb12 100644
--- a/lib/File/KDBX/Key/File.pm
+++ b/lib/File/KDBX/Key/File.pm
@@ -5,7 +5,8 @@ use warnings;
use strict;
use Crypt::Digest qw(digest_data);
-use Crypt::Misc 0.029 qw(decode_b64);
+use Crypt::Misc 0.029 qw(decode_b64 encode_b64);
+use Crypt::PRNG qw(random_bytes);
use File::KDBX::Constants qw(:key_file);
use File::KDBX::Error;
use File::KDBX::Util qw(:erase trim);
@@ -18,7 +19,20 @@ use parent 'File::KDBX::Key';
our $VERSION = '999.999'; # VERSION
-sub init {
+=method load
+
+ $key = $key->load($filepath);
+ $key = $key->load(\$string);
+ $key = $key->load($fh);
+ $key = $key->load(*IO);
+
+Load a key file.
+
+=cut
+
+sub init { shift->load(@_) }
+
+sub load {
my $self = shift;
my $primitive = shift // throw 'Missing key primitive';
@@ -119,6 +133,57 @@ Get the filepath to the key file, if known.
sub filepath { $_[0]->{filepath} }
+=method save
+
+ $key->save;
+ $key->save(%options);
+
+Write a key file. Available options:
+
+=for :list
+* C - Type of key file (default: value of L, or C)
+* C - Version of key file (default: value of L, or 2)
+* C - Where to save the file (default: value of L)
+* C - IO handle to write to (overrides C, one of which must be defined)
+* C - Raw key (default: value of L)
+
+=cut
+
+sub save {
+ my $self = shift;
+ my %args = @_;
+
+ my @cleanup;
+ my $raw_key = $args{raw_key} // $self->raw_key // random_bytes(32);
+ push @cleanup, erase_scoped $raw_key;
+ length($raw_key) == 32 or throw 'Raw key must be exactly 256 bits (32 bytes)', length => length($raw_key);
+
+ my $type = $args{type} // $self->type // KEY_FILE_TYPE_XML;
+ my $version = $args{version} // $self->version // 2;
+ my $filepath = $args{filepath} // $self->filepath;
+ my $fh = $args{fh};
+
+ if (!openhandle($fh)) {
+ $filepath or throw 'Must specify where to safe the key file to';
+ open($fh, '>:raw', $filepath) or throw "Failed to open key file for writing: $!";
+ }
+
+ if ($type == KEY_FILE_TYPE_XML) {
+ $self->_save_xml($fh, $raw_key, $version);
+ }
+ elsif ($type == KEY_FILE_TYPE_BINARY) {
+ print $fh $raw_key;
+ }
+ elsif ($type == KEY_FILE_TYPE_HEX) {
+ my $hex = uc(unpack('H*', $raw_key));
+ push @cleanup, erase_scoped $hex;
+ print $fh $hex;
+ }
+ else {
+ throw "Cannot save $type key file (invalid type)", type => $type;
+ }
+}
+
##############################################################################
sub _load_xml {
@@ -166,7 +231,7 @@ sub _load_xml {
$$out = pack('H*', $data);
$hash = pack('H*', $hash);
my $got_hash = digest_data('SHA256', $$out);
- $hash eq substr($got_hash, 0, 4)
+ $hash eq substr($got_hash, 0, length($hash))
or throw 'Checksum mismatch', got => $got_hash, expected => $hash;
return (KEY_FILE_TYPE_XML, $version);
}
@@ -174,4 +239,83 @@ sub _load_xml {
throw 'Unexpected data in key file', version => $version, data => $data;
}
+sub _save_xml {
+ my $self = shift;
+ my $fh = shift;
+ my $raw_key = shift;
+ my $version = shift // 2;
+
+ my @cleanup;
+
+ my $dom = XML::LibXML::Document->new('1.0', 'UTF-8');
+ my $doc = XML::LibXML::Element->new('KeyFile');
+ $dom->setDocumentElement($doc);
+ my $meta_node = XML::LibXML::Element->new('Meta');
+ $doc->appendChild($meta_node);
+ my $version_node = XML::LibXML::Element->new('Version');
+ $version_node->appendText(sprintf('%.1f', $version));
+ $meta_node->appendChild($version_node);
+ my $key_node = XML::LibXML::Element->new('Key');
+ $doc->appendChild($key_node);
+ my $data_node = XML::LibXML::Element->new('Data');
+ $key_node->appendChild($data_node);
+
+ if (int($version) == 1) {
+ my $b64 = encode_b64($raw_key);
+ push @cleanup, erase_scoped $b64;
+ $data_node->appendText($b64);
+ }
+ elsif (int($version) == 2) {
+ my @hex = unpack('(H8)8', $raw_key);
+ my $hex = uc(sprintf("\n %s\n %s\n ", join(' ', @hex[0..3]), join(' ', @hex[4..7])));
+ push @cleanup, erase_scoped $hex, @hex;
+ $data_node->appendText($hex);
+ my $hash = digest_data('SHA256', $raw_key);
+ substr($hash, 4) = '';
+ $hash = uc(unpack('H*', $hash));
+ $data_node->setAttribute('Hash', $hash);
+ }
+ else {
+ throw 'Failed to save unsupported key file version', version => $version;
+ }
+
+ $dom->toFH($fh, 1);
+}
+
1;
+__END__
+
+=head1 SYNOPSIS
+
+ use File::KDBX::Constants qw(:key_file);
+ use File::KDBX::Key::File;
+
+ ### Create a key file:
+
+ my $key = File::KDBX::Key::File->new(
+ filepath => 'path/to/file.keyx',
+ type => KEY_FILE_TYPE_XML, # optional
+ version => 2, # optional
+ raw_key => $raw_key, # optional - leave undefined to generate a random key
+ );
+ $key->save;
+
+ ### Use a key file:
+
+ my $key2 = File::KDBX::Key::File->new('path/to/file.keyx');
+ # OR
+ my $key2 = File::KDBX::Key::File->new(\$secret);
+ # OR
+ my $key2 = File::KDBX::Key::File->new($fh); # or *IO
+
+=head1 DESCRIPTION
+
+A file key (or "key file") is the type of key where the secret is a file. The secret is either the file
+contents or is generated based on the file contents. In order to lock and unlock a KDBX database with a key
+file, the same file must be presented. The database cannot be opened without the file.
+
+Inherets methods and attributes from L.
+
+There are multiple types of key files supported. See L. This module can read and write key files.
+
+=cut