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#![allow(incomplete_features)]
#![feature(const_fn)]
#![feature(const_generics)]
#[doc(hidden)]
mod error;
use serde::{de::DeserializeOwned, Serialize};
use std::fs;
use std::io::{Seek, SeekFrom, Write};
use std::marker::PhantomData;
pub use crate::error::{Error, Result};
pub use binary_enclave_macro::enclave;
#[doc(hidden)]
pub trait EnclaveLocator {
const SECTION: &'static str;
}
pub struct Enclave<T, const SIZE: usize>([u8; SIZE], PhantomData<T>);
impl<T, const SIZE: usize> Enclave<T, SIZE>
where
T: Default + Serialize + DeserializeOwned + EnclaveLocator,
{
pub const fn new() -> Self {
Self([0; SIZE], PhantomData)
}
pub fn decode(&self) -> T {
match bincode::deserialize(&self.0) {
Ok(s) => s,
Err(e) => {
println!("Deserialization Error. Ignoring. Bad Binary? {}", e);
Default::default()
}
}
}
pub fn write(&self, payload: &T) -> Result<usize> {
self.__write(payload)
}
#[cfg(target_os = "macos")]
#[doc(hidden)]
pub fn __write(&self, payload: &T) -> Result<usize> {
use goblin::mach;
let mut data = read_binary()?;
let mach = mach::MachO::parse(&data, 0)?;
let segment = mach
.segments
.iter()
.find(|s| s.name().unwrap() == "__DATA")
.ok_or_else(|| Error::SectionNotFound("__DATA Segment not found".into()))?;
let (offset, size) = segment
.sections()?
.iter()
.find(|sec| sec.0.name().unwrap() == T::SECTION)
.map(|x| (x.0.offset, x.0.size))
.ok_or_else(|| Error::SectionNotFound("Binary Section not found".into()))?;
write_binary(&mut data, &payload, offset as usize, size as usize)
}
#[cfg(target_os = "linux")]
#[doc(hidden)]
pub fn __write(&self, payload: &T) -> Result<usize> {
use goblin::elf::Elf;
let mut data = read_binary()?;
let elf = Elf::parse(&data)?;
let section = elf
.section_headers
.iter()
.find(|sec| &elf.shdr_strtab[sec.sh_name] == ".bincrypt")
.ok_or_else(|| Error::SectionNotFound("Binary Section not found".into()))?;
write_binary(&mut data, &payload, section.sh_offset, section.sh_size)
}
#[cfg(not(any(target_os = "macos", target_os = "linux")))]
pub fn write(&self, payload: &T) -> Result<usize> {
panic!("Not Supported")
}
}
fn read_binary() -> Result<Vec<u8>> {
let args: Vec<String> = std::env::args().collect();
let bytes = fs::read(&args[0])?;
Ok(bytes)
}
fn write_binary<T: Serialize>(
data: &mut Vec<u8>,
payload: &T,
offset: usize,
size: usize,
) -> Result<usize> {
let payload = bincode::serialize(payload)?;
if payload.len() > size {
return Err(Error::SectionSizeExceeded {
payload: payload.len(),
section: size,
});
}
let mut data = std::io::Cursor::new(data);
data.seek(SeekFrom::Start(offset as u64))?;
data.write_all(&payload)?;
let data = data.into_inner();
let args: Vec<String> = std::env::args().collect();
let file = &args[0];
let tmpfile = format!("{}.new", file);
let perms = fs::metadata(&file)?.permissions();
fs::write(&tmpfile, &data)?;
fs::rename(&tmpfile, &file)?;
fs::set_permissions(&file, perms)?;
Ok(payload.len())
}