forked from m4b/goblin
/
export.rs
529 lines (484 loc) · 21.3 KB
/
export.rs
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use alloc::vec::Vec;
use scroll::{Pread, Pwrite};
use log::debug;
use crate::error;
use crate::pe::data_directories;
use crate::pe::options;
use crate::pe::section_table;
use crate::pe::utils;
#[repr(C)]
#[derive(Debug, PartialEq, Copy, Clone, Default, Pread, Pwrite)]
pub struct ExportDirectoryTable {
pub export_flags: u32,
pub time_date_stamp: u32,
pub major_version: u16,
pub minor_version: u16,
pub name_rva: u32,
pub ordinal_base: u32,
pub address_table_entries: u32,
pub number_of_name_pointers: u32,
pub export_address_table_rva: u32,
pub name_pointer_rva: u32,
pub ordinal_table_rva: u32,
}
pub const SIZEOF_EXPORT_DIRECTORY_TABLE: usize = 40;
impl ExportDirectoryTable {
pub fn parse(bytes: &[u8], offset: usize) -> error::Result<Self> {
let res = bytes.pread_with(offset, scroll::LE)?;
Ok(res)
}
}
#[derive(Debug)]
pub enum ExportAddressTableEntry {
ExportRVA(u32),
ForwarderRVA(u32),
}
pub const SIZEOF_EXPORT_ADDRESS_TABLE_ENTRY: usize = 4;
pub type ExportAddressTable = Vec<ExportAddressTableEntry>;
/// Array of rvas into the export name table
///
/// Export name is defined iff pointer table has pointer to the name
pub type ExportNamePointerTable = Vec<u32>;
/// Array of indexes into the export address table.
///
/// Should obey the formula `idx = ordinal - ordinalbase`
pub type ExportOrdinalTable = Vec<u16>;
#[derive(Debug, Default)]
/// Export data contains the `dll` name which other libraries can import symbols by (two-level namespace), as well as other important indexing data allowing symbol lookups
pub struct ExportData<'a> {
pub name: Option<&'a str>,
pub export_directory_table: ExportDirectoryTable,
pub export_name_pointer_table: ExportNamePointerTable,
pub export_ordinal_table: ExportOrdinalTable,
pub export_address_table: ExportAddressTable,
}
impl<'a> ExportData<'a> {
pub fn parse(
bytes: &'a [u8],
dd: data_directories::DataDirectory,
sections: &[section_table::SectionTable],
file_alignment: u32,
) -> error::Result<ExportData<'a>> {
Self::parse_with_opts(
bytes,
dd,
sections,
file_alignment,
&options::ParseOptions::default(),
)
}
pub fn parse_with_opts(
bytes: &'a [u8],
dd: data_directories::DataDirectory,
sections: &[section_table::SectionTable],
file_alignment: u32,
opts: &options::ParseOptions,
) -> error::Result<ExportData<'a>> {
let export_rva = dd.virtual_address as usize;
let size = dd.size as usize;
debug!("export_rva {:#x} size {:#}", export_rva, size);
let export_offset = utils::find_offset_or(
export_rva,
sections,
file_alignment,
opts,
&format!("cannot map export_rva ({:#x}) into offset", export_rva),
)?;
let export_directory_table =
ExportDirectoryTable::parse(bytes, export_offset).map_err(|_| {
error::Error::Malformed(format!(
"cannot parse export_directory_table (offset {:#x})",
export_offset
))
})?;
let number_of_name_pointers = export_directory_table.number_of_name_pointers as usize;
let address_table_entries = export_directory_table.address_table_entries as usize;
let export_name_pointer_table = utils::find_offset(
export_directory_table.name_pointer_rva as usize,
sections,
file_alignment,
opts,
)
.map_or(vec![], |table_offset| {
let mut offset = table_offset;
let mut table: ExportNamePointerTable = Vec::with_capacity(number_of_name_pointers);
for _ in 0..number_of_name_pointers {
if let Ok(name_rva) = bytes.gread_with(&mut offset, scroll::LE) {
table.push(name_rva);
} else {
break;
}
}
table
});
let export_ordinal_table = utils::find_offset(
export_directory_table.ordinal_table_rva as usize,
sections,
file_alignment,
opts,
)
.map_or(vec![], |table_offset| {
let mut offset = table_offset;
let mut table: ExportOrdinalTable = Vec::with_capacity(number_of_name_pointers);
for _ in 0..number_of_name_pointers {
if let Ok(name_ordinal) = bytes.gread_with(&mut offset, scroll::LE) {
table.push(name_ordinal);
} else {
break;
}
}
table
});
let export_address_table = utils::find_offset(
export_directory_table.export_address_table_rva as usize,
sections,
file_alignment,
opts,
)
.map_or(vec![], |table_offset| {
let mut offset = table_offset;
let mut table: ExportAddressTable = Vec::with_capacity(address_table_entries);
let export_end = export_rva + size;
for _ in 0..address_table_entries {
if let Ok(func_rva) = bytes.gread_with::<u32>(&mut offset, scroll::LE) {
if utils::is_in_range(func_rva as usize, export_rva, export_end) {
table.push(ExportAddressTableEntry::ForwarderRVA(func_rva));
} else {
table.push(ExportAddressTableEntry::ExportRVA(func_rva));
}
} else {
break;
}
}
table
});
let name = utils::find_offset(
export_directory_table.name_rva as usize,
sections,
file_alignment,
opts,
)
.and_then(|offset| bytes.pread(offset).ok());
Ok(ExportData {
name,
export_directory_table,
export_name_pointer_table,
export_ordinal_table,
export_address_table,
})
}
}
#[derive(Debug)]
/// PE binaries have two kinds of reexports, either specifying the dll's name, or the ordinal value of the dll
pub enum Reexport<'a> {
DLLName { export: &'a str, lib: &'a str },
DLLOrdinal { ordinal: usize, lib: &'a str },
}
impl<'a> scroll::ctx::TryFromCtx<'a, scroll::Endian> for Reexport<'a> {
type Error = crate::error::Error;
#[inline]
fn try_from_ctx(bytes: &'a [u8], _ctx: scroll::Endian) -> Result<(Self, usize), Self::Error> {
let reexport = bytes.pread::<&str>(0)?;
let reexport_len = reexport.len();
debug!("reexport: {}", &reexport);
for o in 0..reexport_len {
let c: u8 = bytes.pread(o)?;
debug!("reexport offset: {:#x} char: {:#x}", o, c);
if c == b'.' {
let dll: &'a str = bytes.pread_with(0, scroll::ctx::StrCtx::Length(o))?;
debug!("dll: {:?}", &dll);
if o + 1 == reexport_len {
break;
}
let len = reexport_len - o - 1;
let rest: &'a [u8] = bytes.pread_with(o + 1, len)?;
debug!("rest: {:?}", &rest);
if rest[0] == b'#' {
let ordinal =
rest.pread_with::<&str>(1, scroll::ctx::StrCtx::Length(len - 1))?;
let ordinal = ordinal.parse::<u32>().map_err(|_e| {
error::Error::Malformed(format!(
"Cannot parse reexport ordinal from {} bytes",
bytes.len()
))
})?;
return Ok((
Reexport::DLLOrdinal {
ordinal: ordinal as usize,
lib: dll,
},
reexport_len + 1,
));
} else {
let export = rest.pread_with::<&str>(0, scroll::ctx::StrCtx::Length(len))?;
return Ok((Reexport::DLLName { export, lib: dll }, reexport_len + 1));
}
}
}
Err(error::Error::Malformed(format!(
"Reexport {:#} is malformed",
reexport
)))
}
}
impl<'a> Reexport<'a> {
pub fn parse(bytes: &'a [u8], offset: usize) -> crate::error::Result<Reexport<'a>> {
bytes.pread(offset)
}
}
#[derive(Debug, Default)]
/// An exported symbol in this binary, contains synthetic data (name offset, etc., are computed)
pub struct Export<'a> {
pub name: Option<&'a str>,
pub offset: usize,
pub rva: usize,
pub size: usize,
pub reexport: Option<Reexport<'a>>,
}
#[derive(Debug, Copy, Clone)]
struct ExportCtx<'a> {
pub ptr: u32,
pub idx: usize,
pub sections: &'a [section_table::SectionTable],
pub file_alignment: u32,
pub addresses: &'a ExportAddressTable,
pub ordinals: &'a ExportOrdinalTable,
pub opts: options::ParseOptions,
}
impl<'a, 'b> scroll::ctx::TryFromCtx<'a, ExportCtx<'b>> for Export<'a> {
type Error = error::Error;
#[inline]
fn try_from_ctx(
bytes: &'a [u8],
ExportCtx {
ptr,
idx,
sections,
file_alignment,
addresses,
ordinals,
opts,
}: ExportCtx<'b>,
) -> Result<(Self, usize), Self::Error> {
use self::ExportAddressTableEntry::*;
let name = utils::find_offset(ptr as usize, sections, file_alignment, &opts)
.and_then(|offset| bytes.pread::<&str>(offset).ok());
if let Some(ordinal) = ordinals.get(idx) {
if let Some(rva) = addresses.get(*ordinal as usize) {
match *rva {
ExportRVA(rva) => {
let rva = rva as usize;
let offset = utils::find_offset_or(
rva,
sections,
file_alignment,
&opts,
&format!(
"cannot map RVA ({:#x}) of export ordinal {} into offset",
rva, ordinal
),
)?;
Ok((
Export {
name,
offset,
rva,
reexport: None,
size: 0,
},
0,
))
}
ForwarderRVA(rva) => {
let rva = rva as usize;
let offset = utils::find_offset_or(
rva,
sections,
file_alignment,
&opts,
&format!(
"cannot map RVA ({:#x}) of export ordinal {} into offset",
rva, ordinal
),
)?;
let reexport = Reexport::parse(bytes, offset)?;
Ok((
Export {
name,
offset,
rva,
reexport: Some(reexport),
size: 0,
},
0,
))
}
}
} else {
Err(error::Error::Malformed(format!(
"cannot get RVA of export ordinal {}",
ordinal
)))
}
} else {
Err(error::Error::Malformed(format!(
"cannot get ordinal of export name entry {}",
idx
)))
}
}
}
impl<'a> Export<'a> {
pub fn parse(
bytes: &'a [u8],
export_data: &ExportData,
sections: &[section_table::SectionTable],
file_alignment: u32,
) -> error::Result<Vec<Export<'a>>> {
Self::parse_with_opts(
bytes,
export_data,
sections,
file_alignment,
&options::ParseOptions::default(),
)
}
pub fn parse_with_opts(
bytes: &'a [u8],
export_data: &ExportData,
sections: &[section_table::SectionTable],
file_alignment: u32,
opts: &options::ParseOptions,
) -> error::Result<Vec<Export<'a>>> {
let pointers = &export_data.export_name_pointer_table;
let addresses = &export_data.export_address_table;
let ordinals = &export_data.export_ordinal_table;
let mut exports = Vec::with_capacity(pointers.len());
for (idx, &ptr) in pointers.iter().enumerate() {
if let Ok(export) = bytes.pread_with(
0,
ExportCtx {
ptr,
idx,
sections,
file_alignment,
addresses,
ordinals,
opts: *opts,
},
) {
exports.push(export);
}
}
// TODO: sort + compute size
Ok(exports)
}
}
#[cfg(test)]
mod tests {
use self::data_directories::*;
use super::*;
static CORKAMI_POCS_PE_EXPORTSDATA_EXE: [u8; 0x400] = [
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0x00, 0x00, 0x00, 0x00,
];
#[test]
fn size_export_directory_table() {
assert_eq!(
::std::mem::size_of::<ExportDirectoryTable>(),
SIZEOF_EXPORT_DIRECTORY_TABLE
);
}
#[test]
fn parse_export_table() {
let data_dirs =
DataDirectories::parse(&CORKAMI_POCS_PE_EXPORTSDATA_EXE[..], 16, &mut 0xb8).unwrap();
let export_table = data_dirs.get_export_table().unwrap();
assert_eq!(export_table.virtual_address, 0x10b0);
assert_eq!(export_table.size, 0x0);
}
#[test]
fn parse_export_directory() {
let data_dir = ExportDirectoryTable::parse(&CORKAMI_POCS_PE_EXPORTSDATA_EXE[..], 0x2b0);
assert!(data_dir.is_ok());
let data_dir = data_dir.unwrap();
assert_eq!(data_dir.export_flags, 0x0);
assert_eq!(data_dir.time_date_stamp, 0x0);
assert_eq!(data_dir.major_version, 0x0);
assert_eq!(data_dir.minor_version, 0x0);
assert_eq!(data_dir.name_rva, 0x0);
assert_eq!(data_dir.ordinal_base, 0x0);
assert_eq!(data_dir.address_table_entries, 0x4);
assert_eq!(data_dir.number_of_name_pointers, 0x0);
assert_eq!(data_dir.export_address_table_rva, 0x10e0);
assert_eq!(data_dir.name_pointer_rva, 0x0);
assert_eq!(data_dir.ordinal_table_rva, 0x1100);
}
}