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topjohnwu
2023-09-14 13:10:09 -07:00
parent 6a59939d9a
commit dda8cc85c9
9 changed files with 57 additions and 55 deletions
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native/src/core/cert.rs
+18 -15
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@@ -1,6 +1,7 @@
use std::fs::File;
use std::io;
use std::io::{Cursor, Read, Seek, SeekFrom};
use std::mem::size_of_val;
use std::os::fd::{FromRawFd, RawFd};
use base::*;
@@ -45,13 +46,13 @@ pub fn read_certificate(fd: RawFd, version: i32) -> Vec<u8> {
// Find EOCD
for i in 0u16.. {
let mut comment_sz = 0u16;
apk.seek(SeekFrom::End(-(comment_sz.bytes_size() as i64) - i as i64))?;
apk.read_flat_data(&mut comment_sz)?;
apk.seek(SeekFrom::End(-(size_of_val(&comment_sz) as i64) - i as i64))?;
apk.read_pod(&mut comment_sz)?;
if comment_sz == i {
apk.seek(SeekFrom::Current(-22))?;
let mut magic = 0u32;
apk.read_flat_data(&mut magic)?;
apk.read_pod(&mut magic)?;
if magic == EOCD_MAGIC {
break;
}
@@ -65,12 +66,12 @@ pub fn read_certificate(fd: RawFd, version: i32) -> Vec<u8> {
// Seek and read central_dir_off to find the start of the central directory
let mut central_dir_off = 0u32;
apk.seek(SeekFrom::Current(12))?;
apk.read_flat_data(&mut central_dir_off)?;
apk.read_pod(&mut central_dir_off)?;
// Code for parse APK comment to get version code
if version >= 0 {
let mut comment_sz = 0u16;
apk.read_flat_data(&mut comment_sz)?;
apk.read_pod(&mut comment_sz)?;
let mut comment = vec![0u8; comment_sz as usize];
apk.read_exact(&mut comment)?;
let mut comment = Cursor::new(&comment);
@@ -90,7 +91,7 @@ pub fn read_certificate(fd: RawFd, version: i32) -> Vec<u8> {
// Next, find the start of the APK signing block
apk.seek(SeekFrom::Start((central_dir_off - 24) as u64))?;
apk.read_flat_data(&mut u64_val)?; // u64_value = block_sz_
apk.read_pod(&mut u64_val)?; // u64_value = block_sz_
let mut magic = [0u8; 16];
apk.read_exact(&mut magic)?;
if magic != APK_SIGNING_BLOCK_MAGIC {
@@ -98,38 +99,40 @@ pub fn read_certificate(fd: RawFd, version: i32) -> Vec<u8> {
}
let mut signing_blk_sz = 0u64;
apk.seek(SeekFrom::Current(
-(u64_val as i64) - (signing_blk_sz.bytes_size() as i64),
-(u64_val as i64) - (size_of_val(&signing_blk_sz) as i64),
))?;
apk.read_flat_data(&mut signing_blk_sz)?;
apk.read_pod(&mut signing_blk_sz)?;
if signing_blk_sz != u64_val {
return Err(bad_apk!("invalid signing block size"));
}
// Finally, we are now at the beginning of the id-value pair sequence
loop {
apk.read_flat_data(&mut u64_val)?; // id-value pair length
apk.read_pod(&mut u64_val)?; // id-value pair length
if u64_val == signing_blk_sz {
break;
}
let mut id = 0u32;
apk.read_flat_data(&mut id)?;
apk.read_pod(&mut id)?;
if id == SIGNATURE_SCHEME_V2_MAGIC {
// Skip [signer sequence length] + [1st signer length] + [signed data length]
apk.seek(SeekFrom::Current((u32_val.bytes_size() * 3) as i64))?;
apk.seek(SeekFrom::Current((size_of_val(&u32_val) * 3) as i64))?;
apk.read_flat_data(&mut u32_val)?; // digest sequence length
apk.read_pod(&mut u32_val)?; // digest sequence length
apk.seek(SeekFrom::Current(u32_val as i64))?; // skip all digests
apk.seek(SeekFrom::Current(u32_val.bytes_size() as i64))?; // cert sequence length
apk.read_flat_data(&mut u32_val)?; // 1st cert length
apk.seek(SeekFrom::Current(size_of_val(&u32_val) as i64))?; // cert sequence length
apk.read_pod(&mut u32_val)?; // 1st cert length
let mut cert = vec![0; u32_val as usize];
apk.read_exact(cert.as_mut())?;
return Ok(cert);
} else {
// Skip this id-value pair
apk.seek(SeekFrom::Current(u64_val as i64 - (id.bytes_size() as i64)))?;
apk.seek(SeekFrom::Current(
u64_val as i64 - (size_of_val(&id) as i64),
))?;
}
}