/usr/share/perl5/Parse/Win32Registry/WinNT/Key.pm is in libparse-win32registry-perl 1.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use strict;
use warnings;
use base qw(Parse::Win32Registry::Key);
use Carp;
use Encode;
use Parse::Win32Registry::Base qw(:all);
use Parse::Win32Registry::WinNT::Value;
use Parse::Win32Registry::WinNT::Security;
use constant NK_HEADER_LENGTH => 0x50;
use constant OFFSET_TO_FIRST_HBIN => 0x1000;
sub new {
my $class = shift;
my $regfile = shift;
my $offset = shift; # offset to nk record relative to start of file
my $parent_key_path = shift; # parent key path (optional)
croak 'Missing registry file' if !defined $regfile;
croak 'Missing offset' if !defined $offset;
my $fh = $regfile->get_filehandle;
# 0x00 dword = key length (negative = allocated)
# 0x04 word = 'nk' signature
# 0x06 word = flags
# 0x08 qword = timestamp
# 0x10
# 0x14 dword = offset to parent
# 0x18 dword = number of subkeys
# 0x1c
# 0x20 dword = offset to subkey list (lf, lh, ri, li)
# 0x24
# 0x28 dword = number of values
# 0x2c dword = offset to value list
# 0x30 dword = offset to security
# 0x34 dword = offset to class name
# 0x38 dword = max subkey name length
# 0x3c dword = max class name length
# 0x40 dword = max value name length
# 0x44 dword = max value data length
# 0x48
# 0x4c word = key name length
# 0x4e word = class name length
# 0x50 = key name [for key name length bytes]
# Extracted offsets are always relative to first hbin
sysseek($fh, $offset, 0);
my $bytes_read = sysread($fh, my $nk_header, NK_HEADER_LENGTH);
if ($bytes_read != NK_HEADER_LENGTH) {
warnf('Could not read key at 0x%x', $offset);
return;
}
my ($length,
$sig,
$flags,
$timestamp,
$offset_to_parent,
$num_subkeys,
$offset_to_subkey_list,
$num_values,
$offset_to_value_list,
$offset_to_security,
$offset_to_class_name,
$name_length,
$class_name_length,
) = unpack('Va2va8x4VVx4Vx4VVVVx20vv', $nk_header);
$offset_to_parent += OFFSET_TO_FIRST_HBIN
if $offset_to_parent != 0xffffffff;
$offset_to_subkey_list += OFFSET_TO_FIRST_HBIN
if $offset_to_subkey_list != 0xffffffff;
$offset_to_value_list += OFFSET_TO_FIRST_HBIN
if $offset_to_value_list != 0xffffffff;
$offset_to_security += OFFSET_TO_FIRST_HBIN
if $offset_to_security != 0xffffffff;
$offset_to_class_name += OFFSET_TO_FIRST_HBIN
if $offset_to_class_name != 0xffffffff;
my $allocated = 0;
if ($length > 0x7fffffff) {
$allocated = 1;
$length = (0xffffffff - $length) + 1;
}
# allocated should be true
if ($length < NK_HEADER_LENGTH) {
warnf('Invalid value entry length at 0x%x', $offset);
return;
}
if ($sig ne 'nk') {
warnf('Invalid signature for key at 0x%x', $offset);
return;
}
$bytes_read = sysread($fh, my $name, $name_length);
if ($bytes_read != $name_length) {
warnf('Could not read name for key at 0x%x', $offset);
return;
}
if ($flags & 0x20) {
$name = decode($Parse::Win32Registry::Base::CODEPAGE, $name);
}
else {
$name = decode('UCS-2LE', $name);
}
my $key_path = (defined $parent_key_path)
? "$parent_key_path\\$name"
: "$name";
my $class_name;
if ($offset_to_class_name != 0xffffffff) {
sysseek($fh, $offset_to_class_name + 4, 0);
$bytes_read = sysread($fh, $class_name, $class_name_length);
if ($bytes_read != $class_name_length) {
warnf('Could not read class name at 0x%x', $offset_to_class_name);
$class_name = undef;
}
else {
$class_name = decode('UCS-2LE', $class_name);
}
}
my $self = {};
$self->{_regfile} = $regfile;
$self->{_offset} = $offset;
$self->{_length} = $length;
$self->{_allocated} = $allocated;
$self->{_tag} = $sig;
$self->{_name} = $name;
$self->{_name_length} = $name_length;
$self->{_key_path} = $key_path;
$self->{_flags} = $flags;
$self->{_offset_to_parent} = $offset_to_parent;
$self->{_num_subkeys} = $num_subkeys;
$self->{_offset_to_subkey_list} = $offset_to_subkey_list;
$self->{_num_values} = $num_values;
$self->{_offset_to_value_list} = $offset_to_value_list;
$self->{_timestamp} = unpack_windows_time($timestamp);
$self->{_offset_to_security} = $offset_to_security;
$self->{_offset_to_class_name} = $offset_to_class_name;
$self->{_class_name_length} = $class_name_length;
$self->{_class_name} = $class_name;
bless $self, $class;
return $self;
}
sub get_timestamp {
my $self = shift;
return $self->{_timestamp};
}
sub get_timestamp_as_string {
my $self = shift;
return iso8601($self->get_timestamp);
}
sub get_class_name {
my $self = shift;
return $self->{_class_name};
}
sub is_root {
my $self = shift;
my $flags = $self->{_flags};
return $flags & 4 || $flags & 8;
}
sub get_parent {
my $self = shift;
my $regfile = $self->{_regfile};
my $offset_to_parent = $self->{_offset_to_parent};
my $key_path = $self->{_key_path};
return if $self->is_root;
my $grandparent_key_path;
my @keys = split /\\/, $key_path, -1;
if (@keys > 2) {
$grandparent_key_path = join('\\', @keys[0..$#keys-2]);
}
return Parse::Win32Registry::WinNT::Key->new($regfile,
$offset_to_parent,
$grandparent_key_path);
}
sub get_security {
my $self = shift;
my $regfile = $self->{_regfile};
my $offset_to_security = $self->{_offset_to_security};
my $key_path = $self->{_key_path};
if ($offset_to_security == 0xffffffff) {
return;
}
return Parse::Win32Registry::WinNT::Security->new($regfile,
$offset_to_security,
$key_path);
}
sub as_string {
my $self = shift;
my $string = $self->get_path . ' [' . $self->get_timestamp_as_string . ']';
return $string;
}
sub parse_info {
my $self = shift;
my $info = sprintf '0x%x nk len=0x%x alloc=%d "%s" par=0x%x keys=%d,0x%x vals=%d,0x%x sec=0x%x class=0x%x',
$self->{_offset},
$self->{_length},
$self->{_allocated},
$self->{_name},
$self->{_offset_to_parent},
$self->{_num_subkeys}, $self->{_offset_to_subkey_list},
$self->{_num_values}, $self->{_offset_to_value_list},
$self->{_offset_to_security},
$self->{_offset_to_class_name};
if (defined $self->{_class_name}) {
$info .= sprintf ',len=0x%x', $self->{_class_name_length};
}
return $info;
}
sub _get_offsets_to_subkeys {
my $self = shift;
# Offset is passed as a parameter for recursive lists such as 'ri'
my $offset_to_subkey_list = shift || $self->{_offset_to_subkey_list};
my $regfile = $self->{_regfile};
my $fh = $regfile->get_filehandle;
return if $offset_to_subkey_list == 0xffffffff
|| $self->{_num_subkeys} == 0;
sysseek($fh, $offset_to_subkey_list, 0);
my $bytes_read = sysread($fh, my $subkey_list_header, 8);
if ($bytes_read != 8) {
warnf('Could not read subkey list header at 0x%x',
$offset_to_subkey_list);
return;
}
# 0x00 dword = subkey list length (negative = allocated)
# 0x04 word = 'lf' signature
# 0x06 word = number of entries
# 0x08 dword = offset to 1st subkey
# 0x0c dword = first four characters of the key name
# 0x10 dword = offset to 2nd subkey
# 0x14 dword = first four characters of the key name
# ...
# 0x00 dword = subkey list length (negative = allocated)
# 0x04 word = 'lh' signature
# 0x06 word = number of entries
# 0x08 dword = offset to 1st subkey
# 0x0c dword = hash of the key name
# 0x10 dword = offset to 2nd subkey
# 0x14 dword = hash of the key name
# ...
# 0x00 dword = subkey list length (negative = allocated)
# 0x04 word = 'ri' signature
# 0x06 word = number of entries in ri list
# 0x08 dword = offset to 1st lf/lh/li list
# 0x0c dword = offset to 2nd lf/lh/li list
# 0x10 dword = offset to 3rd lf/lh/li list
# ...
# 0x00 dword = subkey list length (negative = allocated)
# 0x04 word = 'li' signature
# 0x06 word = number of entries in li list
# 0x08 dword = offset to 1st subkey
# 0x0c dword = offset to 2nd subkey
# ...
# Extracted offsets are always relative to first hbin
my @offsets_to_subkeys = ();
my ($length,
$sig,
$num_entries,
) = unpack('Va2v', $subkey_list_header);
my $subkey_list_length;
if ($sig eq 'lf' || $sig eq 'lh') {
$subkey_list_length = 2 * 4 * $num_entries;
}
elsif ($sig eq 'ri' || $sig eq 'li') {
$subkey_list_length = 4 * $num_entries;
}
else {
warnf('Invalid signature for subkey list at 0x%x',
$offset_to_subkey_list);
return;
}
$bytes_read = sysread($fh, my $subkey_list, $subkey_list_length);
if ($bytes_read != $subkey_list_length) {
warnf('Could not read subkey list at 0x%x',
$offset_to_subkey_list);
return;
}
if ($sig eq 'lf') {
foreach my $offset (unpack("(Vx4)$num_entries", $subkey_list)) {
push @offsets_to_subkeys, OFFSET_TO_FIRST_HBIN + $offset;
}
}
elsif ($sig eq 'lh') {
foreach my $offset (unpack("(Vx4)$num_entries", $subkey_list)) {
push @offsets_to_subkeys, OFFSET_TO_FIRST_HBIN + $offset;
}
}
elsif ($sig eq 'ri') {
foreach my $offset (unpack("V$num_entries", $subkey_list)) {
my $offsets_ref =
$self->_get_offsets_to_subkeys(OFFSET_TO_FIRST_HBIN + $offset);
if (defined $offsets_ref && ref $offsets_ref eq 'ARRAY') {
push @offsets_to_subkeys, @{ $offsets_ref };
}
}
}
elsif ($sig eq 'li') {
foreach my $offset (unpack("V$num_entries", $subkey_list)) {
push @offsets_to_subkeys, OFFSET_TO_FIRST_HBIN + $offset;
}
}
return \@offsets_to_subkeys;
}
sub get_subkey_iterator {
my $self = shift;
my $regfile = $self->{_regfile};
my $key_path = $self->{_key_path};
my @offsets_to_subkeys = ();
if ($self->{_num_subkeys} > 0) {
my $offsets_to_subkeys_ref = $self->_get_offsets_to_subkeys;
if (defined $offsets_to_subkeys_ref) {
@offsets_to_subkeys = @{$self->_get_offsets_to_subkeys};
}
}
return Parse::Win32Registry::Iterator->new(sub {
while (defined(my $offset_to_subkey = shift @offsets_to_subkeys)) {
my $subkey = Parse::Win32Registry::WinNT::Key->new($regfile,
$offset_to_subkey, $key_path);
if (defined $subkey) {
return $subkey;
}
}
return; # no more offsets to subkeys
});
}
sub _get_offsets_to_values {
my $self = shift;
my $regfile = $self->{_regfile};
my $fh = $regfile->get_filehandle;
my $offset_to_value_list = $self->{_offset_to_value_list};
my $num_values = $self->{_num_values};
return if $num_values == 0;
# Actually, this could probably just fall through
# as unpack("x4V0", ...) would return an empty array.
my @offsets_to_values = ();
# 0x00 dword = value list length (negative = allocated)
# 0x04 dword = 1st offset
# 0x08 dword = 2nd offset
# ...
# Extracted offsets are always relative to first hbin
sysseek($fh, $offset_to_value_list, 0);
my $value_list_length = 0x4 + $num_values * 4;
my $bytes_read = sysread($fh, my $value_list, $value_list_length);
if ($bytes_read != $value_list_length) {
warnf("Could not read value list at 0x%x",
$offset_to_value_list);
return;
}
foreach my $offset (unpack("x4V$num_values", $value_list)) {
push @offsets_to_values, OFFSET_TO_FIRST_HBIN + $offset;
}
return \@offsets_to_values;
}
sub get_value_iterator {
my $self = shift;
my $regfile = $self->{_regfile};
my $key_path = $self->{_key_path};
my @offsets_to_values = ();
if ($self->{_num_values} > 0) {
my $offsets_to_values_ref = $self->_get_offsets_to_values;
if (defined $offsets_to_values_ref) {
@offsets_to_values = @{$self->_get_offsets_to_values};
}
}
return Parse::Win32Registry::Iterator->new(sub {
while (defined(my $offset_to_value = shift @offsets_to_values)) {
my $value = Parse::Win32Registry::WinNT::Value->new($regfile,
$offset_to_value);
if (defined $value) {
return $value;
}
}
return; # no more offsets to values
});
}
1;
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