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use crate::error::{NtHiveError, Result};
use crate::helpers::byte_subrange;
use crate::hive::Hive;
use crate::index_root::IndexRootItemRanges;
use crate::key_value::KeyValue;
use crate::key_values_list::KeyValues;
use crate::leaf::{LeafItemRange, LeafItemRanges};
use crate::string::NtHiveNameString;
use crate::subkeys_list::{SubKeyNodes, SubKeyNodesMut};
use ::byteorder::LittleEndian;
use bitflags::bitflags;
use core::cmp::Ordering;
use core::mem;
use core::ops::{Deref, DerefMut, Range};
use core::ptr;
use zerocopy::*;
bitflags! {
struct KeyNodeFlags: u16 {
const KEY_IS_VOLATILE = 0x0001;
const KEY_HIVE_EXIT = 0x0002;
const KEY_HIVE_ENTRY = 0x0004;
const KEY_NO_DELETE = 0x0008;
const KEY_SYM_LINK = 0x0010;
const KEY_COMP_NAME = 0x0020;
const KEY_PREDEF_HANDLE = 0x0040;
const KEY_VIRT_MIRRORED = 0x0080;
const KEY_VIRT_TARGET = 0x0100;
const KEY_VIRTUAL_STORE = 0x0200;
}
}
#[allow(dead_code)]
#[derive(AsBytes, FromBytes, Unaligned)]
#[repr(packed)]
struct KeyNodeHeader {
signature: [u8; 2],
flags: U16<LittleEndian>,
timestamp: U64<LittleEndian>,
spare: U32<LittleEndian>,
parent: U32<LittleEndian>,
subkey_count: U32<LittleEndian>,
volatile_subkey_count: U32<LittleEndian>,
subkeys_list_offset: U32<LittleEndian>,
volatile_subkeys_list_offset: U32<LittleEndian>,
key_values_count: U32<LittleEndian>,
key_values_list_offset: U32<LittleEndian>,
key_security_offset: U32<LittleEndian>,
class_name_offset: U32<LittleEndian>,
max_subkey_name: U32<LittleEndian>,
max_subkey_class_name: U32<LittleEndian>,
max_value_name: U32<LittleEndian>,
max_value_data: U32<LittleEndian>,
work_var: U32<LittleEndian>,
key_name_length: U16<LittleEndian>,
class_name_length: U16<LittleEndian>,
}
#[derive(Clone, Eq, PartialEq)]
struct KeyNodeItemRange {
header_range: Range<usize>,
data_range: Range<usize>,
}
impl KeyNodeItemRange {
fn from_cell_range<B>(hive: &Hive<B>, cell_range: Range<usize>) -> Result<Self>
where
B: ByteSlice,
{
let header_range =
byte_subrange(&cell_range, mem::size_of::<KeyNodeHeader>()).ok_or_else(|| {
NtHiveError::InvalidHeaderSize {
offset: hive.offset_of_data_offset(cell_range.start),
expected: mem::size_of::<KeyNodeHeader>(),
actual: cell_range.len(),
}
})?;
let data_range = header_range.end..cell_range.end;
let key_node_item_range = Self {
header_range,
data_range,
};
key_node_item_range.validate_signature(hive)?;
Ok(key_node_item_range)
}
fn from_leaf_item_range<B>(hive: &Hive<B>, leaf_item_range: LeafItemRange) -> Result<Self>
where
B: ByteSlice,
{
let key_node_offset = leaf_item_range.key_node_offset(hive);
let cell_range = hive.cell_range_from_data_offset(key_node_offset)?;
let key_node = Self::from_cell_range(hive, cell_range)?;
Ok(key_node)
}
fn binary_search_subkey_in_index_root<B>(
&self,
hive: &Hive<B>,
name: &str,
index_root_item_ranges: IndexRootItemRanges,
) -> Option<Result<Self>>
where
B: ByteSlice,
{
assert!(index_root_item_ranges.len() <= u16::MAX as usize);
let mut left = 0i32;
let mut right = index_root_item_ranges.len() as i32 - 1;
while left <= right {
let mid = (left + right) / 2;
let index_root_item_range = index_root_item_ranges.clone().nth(mid as usize).unwrap();
let leaf_item_ranges = iter_try!(LeafItemRanges::from_index_root_item_range(
hive,
index_root_item_range
));
let leaf_item_range = leaf_item_ranges.clone().next().unwrap();
let key_node_item_range = iter_try!(Self::from_leaf_item_range(hive, leaf_item_range));
let key_node_name = iter_try!(key_node_item_range.name(hive));
match key_node_name.partial_cmp(name).unwrap() {
Ordering::Equal => return Some(Ok(key_node_item_range)),
Ordering::Less => (),
Ordering::Greater => {
right = mid - 1;
continue;
}
}
let leaf_item_range = leaf_item_ranges.clone().last().unwrap();
let key_node_item_range = iter_try!(Self::from_leaf_item_range(hive, leaf_item_range));
let key_node_name = iter_try!(key_node_item_range.name(hive));
match key_node_name.partial_cmp(name).unwrap() {
Ordering::Equal => return Some(Ok(key_node_item_range)),
Ordering::Less => {
left = mid + 1;
continue;
}
Ordering::Greater => (),
}
return self.binary_search_subkey_in_leaf(hive, name, leaf_item_ranges);
}
None
}
fn binary_search_subkey_in_leaf<B>(
&self,
hive: &Hive<B>,
name: &str,
leaf_item_ranges: LeafItemRanges,
) -> Option<Result<Self>>
where
B: ByteSlice,
{
assert!(leaf_item_ranges.len() <= u16::MAX as usize);
let mut left = 0i32;
let mut right = leaf_item_ranges.len() as i32 - 1;
while left <= right {
let mid = (left + right) / 2;
let leaf_item_range = leaf_item_ranges.clone().nth(mid as usize).unwrap();
let key_node_item_range = iter_try!(Self::from_leaf_item_range(hive, leaf_item_range));
let key_node_name = iter_try!(key_node_item_range.name(hive));
match key_node_name.partial_cmp(name).unwrap() {
Ordering::Equal => return Some(Ok(key_node_item_range)),
Ordering::Less => left = mid + 1,
Ordering::Greater => right = mid - 1,
}
}
None
}
fn header<'a, B>(&self, hive: &'a Hive<B>) -> LayoutVerified<&'a [u8], KeyNodeHeader>
where
B: ByteSlice,
{
LayoutVerified::new(&hive.data[self.header_range.clone()]).unwrap()
}
fn header_mut<'a, B>(
&self,
hive: &'a mut Hive<B>,
) -> LayoutVerified<&'a mut [u8], KeyNodeHeader>
where
B: ByteSliceMut,
{
LayoutVerified::new(&mut hive.data[self.header_range.clone()]).unwrap()
}
fn name<'a, B>(&self, hive: &'a Hive<B>) -> Result<NtHiveNameString<'a>>
where
B: ByteSlice,
{
let header = self.header(hive);
let flags = KeyNodeFlags::from_bits_truncate(header.flags.get());
let key_name_length = header.key_name_length.get() as usize;
let key_name_range = byte_subrange(&self.data_range, key_name_length).ok_or_else(|| {
NtHiveError::InvalidSizeField {
offset: hive.offset_of_field(&header.key_name_length),
expected: key_name_length as usize,
actual: self.data_range.len(),
}
})?;
let key_name_bytes = &hive.data[key_name_range];
if flags.contains(KeyNodeFlags::KEY_COMP_NAME) {
Ok(NtHiveNameString::Latin1(key_name_bytes))
} else {
Ok(NtHiveNameString::Utf16LE(key_name_bytes))
}
}
fn subkey<B>(&self, hive: &Hive<B>, name: &str) -> Option<Result<Self>>
where
B: ByteSlice,
{
let cell_range = iter_try!(self.subkeys_cell_range(hive)?);
let subkeys = iter_try!(SubKeyNodes::new(hive, cell_range));
match subkeys {
SubKeyNodes::IndexRoot(iter) => {
let index_root_item_ranges = IndexRootItemRanges::from(iter);
self.binary_search_subkey_in_index_root(hive, name, index_root_item_ranges)
}
SubKeyNodes::Leaf(iter) => {
let leaf_item_ranges = LeafItemRanges::from(iter);
self.binary_search_subkey_in_leaf(hive, name, leaf_item_ranges)
}
}
}
fn subkeys_cell_range<B>(&self, hive: &Hive<B>) -> Option<Result<Range<usize>>>
where
B: ByteSlice,
{
let header = self.header(&hive);
let subkeys_list_offset = header.subkeys_list_offset.get();
if subkeys_list_offset == u32::MAX {
return None;
}
let cell_range = iter_try!(hive.cell_range_from_data_offset(subkeys_list_offset));
Some(Ok(cell_range))
}
fn subpath<B>(&self, hive: &Hive<B>, path: &str) -> Option<Result<Self>>
where
B: ByteSlice,
{
let mut key_node_item_range = self.clone();
for component in path.split('\\') {
if !component.is_empty() {
key_node_item_range = iter_try!(key_node_item_range.subkey(hive, component)?);
}
}
Some(Ok(key_node_item_range))
}
fn validate_signature<B>(&self, hive: &Hive<B>) -> Result<()>
where
B: ByteSlice,
{
let header = self.header(hive);
let signature = &header.signature;
let expected_signature = b"nk";
if signature == expected_signature {
Ok(())
} else {
Err(NtHiveError::InvalidTwoByteSignature {
offset: hive.offset_of_field(signature),
expected: expected_signature,
actual: *signature,
})
}
}
fn value<'a, B>(
&self,
hive: &'a Hive<B>,
name: &str,
) -> Option<Result<KeyValue<&'a Hive<B>, B>>>
where
B: ByteSlice,
{
let mut values = iter_try!(self.values(hive)?);
values.find(|key_value| {
let key_value = match key_value {
Ok(key_value) => key_value,
Err(_) => return true,
};
let key_value_name = match key_value.name() {
Ok(name) => name,
Err(_) => return true,
};
key_value_name == name
})
}
fn values<'a, B>(&self, hive: &'a Hive<B>) -> Option<Result<KeyValues<'a, B>>>
where
B: ByteSlice,
{
let header = self.header(hive);
let key_values_list_offset = header.key_values_list_offset.get();
if key_values_list_offset == u32::MAX {
return None;
}
let cell_range = iter_try!(hive.cell_range_from_data_offset(key_values_list_offset));
let count = header.key_values_count.get();
let count_field_offset = hive.offset_of_field(&header.key_values_count);
Some(KeyValues::new(hive, count, count_field_offset, cell_range))
}
}
#[derive(Clone)]
pub struct KeyNode<H: Deref<Target = Hive<B>>, B: ByteSlice> {
hive: H,
item_range: KeyNodeItemRange,
}
impl<H, B> KeyNode<H, B>
where
H: Deref<Target = Hive<B>>,
B: ByteSlice,
{
pub(crate) fn from_cell_range(hive: H, cell_range: Range<usize>) -> Result<Self> {
let item_range = KeyNodeItemRange::from_cell_range(&hive, cell_range)?;
Ok(Self { hive, item_range })
}
pub(crate) fn from_leaf_item_range(hive: H, leaf_item_range: LeafItemRange) -> Result<Self> {
let item_range = KeyNodeItemRange::from_leaf_item_range(&hive, leaf_item_range)?;
Ok(Self { hive, item_range })
}
pub fn name(&self) -> Result<NtHiveNameString> {
self.item_range.name(&self.hive)
}
pub fn subkey(&self, name: &str) -> Option<Result<KeyNode<&Hive<B>, B>>> {
let item_range = iter_try!(self.item_range.subkey(&self.hive, name)?);
Some(Ok(KeyNode {
hive: &self.hive,
item_range,
}))
}
pub fn subkeys(&self) -> Option<Result<SubKeyNodes<B>>> {
let cell_range = iter_try!(self.item_range.subkeys_cell_range(&self.hive)?);
Some(SubKeyNodes::new(&self.hive, cell_range))
}
pub fn subpath(&self, path: &str) -> Option<Result<KeyNode<&Hive<B>, B>>> {
let item_range = iter_try!(self.item_range.subpath(&self.hive, path)?);
Some(Ok(KeyNode {
hive: &self.hive,
item_range,
}))
}
pub fn value(&self, name: &str) -> Option<Result<KeyValue<&Hive<B>, B>>> {
self.item_range.value(&self.hive, name)
}
pub fn values(&self) -> Option<Result<KeyValues<B>>> {
self.item_range.values(&self.hive)
}
}
impl<B> PartialEq for KeyNode<&Hive<B>, B>
where
B: ByteSlice,
{
fn eq(&self, other: &Self) -> bool {
ptr::eq(self.hive, other.hive) && self.item_range == other.item_range
}
}
impl<B> Eq for KeyNode<&Hive<B>, B> where B: ByteSlice {}
impl<H, B> KeyNode<H, B>
where
H: DerefMut<Target = Hive<B>>,
B: ByteSliceMut,
{
pub(crate) fn clear_volatile_subkeys(&mut self) -> Result<()> {
let mut header = self.item_range.header_mut(&mut self.hive);
header.volatile_subkey_count.set(0);
if let Some(subkeys) = self.subkeys_mut() {
let mut subkeys = subkeys?;
while let Some(subkey) = subkeys.next() {
subkey?.clear_volatile_subkeys()?;
}
}
Ok(())
}
pub(crate) fn subkeys_mut(&mut self) -> Option<Result<SubKeyNodesMut<B>>> {
let cell_range = iter_try!(self.item_range.subkeys_cell_range(&self.hive)?);
Some(SubKeyNodesMut::new(&mut self.hive, cell_range))
}
}
#[cfg(test)]
mod tests {
use crate::*;
#[test]
fn test_character_encoding() {
let testhive = crate::helpers::tests::testhive_vec();
let hive = Hive::new(testhive.as_ref()).unwrap();
let root_key_node = hive.root_key_node().unwrap();
let key_node = root_key_node
.subkey("character-encoding-test")
.unwrap()
.unwrap();
let subkey = key_node.subkey("äöü").unwrap().unwrap();
assert!(matches!(
subkey.name().unwrap(),
NtHiveNameString::Latin1(&[0xe4, 0xf6, 0xfc])
));
let subkey1 = key_node.subkey("A").unwrap().unwrap();
let subkey2 = key_node.subkey("a").unwrap().unwrap();
assert!(subkey1 == subkey2);
let subkey1 = key_node.subkey("𐐐").unwrap().unwrap();
let subkey2 = key_node.subkey("𐐸").unwrap().unwrap();
assert!(subkey1 != subkey2);
}
#[test]
fn test_subkey() {
let testhive = crate::helpers::tests::testhive_vec();
let hive = Hive::new(testhive.as_ref()).unwrap();
let root_key_node = hive.root_key_node().unwrap();
let key_node = root_key_node.subkey("subkey-test").unwrap().unwrap();
for i in 0..512 {
let subkey_name = format!("key{}", i);
assert!(
matches!(key_node.subkey(&subkey_name), Some(Ok(_))),
"Could not find subkey \"{}\"",
subkey_name
);
}
}
#[test]
fn test_subkeys() {
let mut key_names = Vec::with_capacity(512);
for i in 0..512 {
key_names.push(format!("key{}", i));
}
key_names.sort_unstable();
let testhive = crate::helpers::tests::testhive_vec();
let hive = Hive::new(testhive.as_ref()).unwrap();
let root_key_node = hive.root_key_node().unwrap();
let key_node = root_key_node.subkey("subkey-test").unwrap().unwrap();
let subkeys = key_node.subkeys().unwrap().unwrap();
for (subkey, expected_key_name) in subkeys.zip(key_names.iter()) {
let subkey = subkey.unwrap();
assert_eq!(subkey.name().unwrap(), expected_key_name.as_str());
}
}
#[test]
fn test_subpath() {
let testhive = crate::helpers::tests::testhive_vec();
let hive = Hive::new(testhive.as_ref()).unwrap();
let root_key_node = hive.root_key_node().unwrap();
let key_node = root_key_node.subkey("subpath-test").unwrap().unwrap();
assert!(matches!(key_node.subpath("no-subkeys"), Some(Ok(_))));
assert!(matches!(key_node.subpath("\\no-subkeys"), Some(Ok(_))));
assert!(matches!(key_node.subpath("no-subkeys\\"), Some(Ok(_))));
assert!(matches!(key_node.subpath("\\no-subkeys\\"), Some(Ok(_))));
assert!(matches!(key_node.subpath("no-subkeys\\non-existing"), None));
assert!(matches!(
key_node.subpath("with-single-level-subkey"),
Some(Ok(_))
));
assert!(matches!(
key_node.subpath("with-single-level-subkey\\subkey"),
Some(Ok(_))
));
assert!(matches!(
key_node.subpath("with-single-level-subkey\\\\subkey"),
Some(Ok(_))
));
assert!(matches!(
key_node.subpath("with-single-level-subkey\\\\subkey\\"),
Some(Ok(_))
));
assert!(matches!(
key_node.subpath("with-single-level-subkey\\subkey\\non-existing-too"),
None
));
assert!(matches!(
key_node.subpath("with-two-levels-of-subkeys\\subkey1\\subkey2"),
Some(Ok(_))
));
assert!(matches!(
key_node.subpath("with-two-levels-of-subkeys\\subkey1\\\\subkey2"),
Some(Ok(_))
));
assert!(matches!(key_node.subpath("non-existing"), None));
assert!(matches!(key_node.subpath("non-existing\\sub"), None));
}
}