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Samuel
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82
src/Backups.proto
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82
src/Backups.proto
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/**
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* Copyright (C) 2018 Open Whisper Systems
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*
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* Licensed according to the LICENSE file in this repository.
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*/
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syntax = "proto2";
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package signal;
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option java_package = "org.thoughtcrime.securesms.backup.proto";
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message SqlStatement {
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message SqlParameter {
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optional string stringParamter = 1;
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optional uint64 integerParameter = 2;
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optional double doubleParameter = 3;
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optional bytes blobParameter = 4;
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optional bool nullparameter = 5;
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}
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optional string statement = 1;
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repeated SqlParameter parameters = 2;
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}
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message SharedPreference {
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optional string file = 1;
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optional string key = 2;
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optional string value = 3;
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optional bool booleanValue = 4;
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repeated string stringSetValue = 5;
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optional bool isStringSetValue = 6;
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}
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message Attachment {
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optional uint64 rowId = 1;
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optional uint64 attachmentId = 2;
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optional uint32 length = 3;
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}
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message Sticker {
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optional uint64 rowId = 1;
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optional uint32 length = 2;
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}
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message Avatar {
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optional string name = 1;
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optional string recipientId = 3;
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optional uint32 length = 2;
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}
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message DatabaseVersion {
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optional uint32 version = 1;
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}
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message Header {
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optional bytes iv = 1;
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optional bytes salt = 2;
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optional uint32 version = 3;
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}
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message KeyValue {
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optional string key = 1;
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optional bytes blobValue = 2;
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optional bool booleanValue = 3;
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optional float floatValue = 4;
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optional int32 integerValue = 5;
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optional int64 longValue = 6;
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optional string stringValue = 7;
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}
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message BackupFrame {
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optional Header header = 1;
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optional SqlStatement statement = 2;
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optional SharedPreference preference = 3;
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optional Attachment attachment = 4;
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optional DatabaseVersion version = 5;
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optional bool end = 6;
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optional Avatar avatar = 7;
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optional Sticker sticker = 8;
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optional KeyValue keyValue = 9;
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}
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490
src/main.rs
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490
src/main.rs
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use std::collections::HashMap;
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use std::fs::{self, File};
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use std::io::{self, BufReader, Read, Seek, SeekFrom, Write};
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use std::path::Path;
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use aes::Aes256;
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use base64::prelude::*;
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use ctr::cipher::{KeyIvInit, StreamCipher};
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use ctr::Ctr32BE;
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use hkdf::Hkdf;
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use hmac::{Hmac, Mac};
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use prost::Message;
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use rusqlite::{Connection, TransactionBehavior};
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use sha2::{Digest, Sha256, Sha512};
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type HmacSha256 = Hmac<Sha256>;
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pub mod signal {
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include!(concat!(env!("OUT_DIR"), "/signal.rs"));
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}
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use signal::BackupFrame;
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#[derive(Debug)]
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struct HeaderData {
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initialisation_vector: Vec<u8>,
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salt: Vec<u8>,
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version: Option<u32>,
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}
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#[derive(Debug)]
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struct Keys {
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cipher_key: Vec<u8>,
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hmac_key: Vec<u8>,
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}
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fn to_io_error(e: rusqlite::Error) -> io::Error {
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io::Error::new(io::ErrorKind::Other, e.to_string())
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}
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fn read_backup_header<R: Read>(backup_file: &mut R) -> io::Result<HeaderData> {
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let mut length_bytes = [0u8; 4];
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backup_file.read_exact(&mut length_bytes)?;
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let length = u32::from_be_bytes(length_bytes);
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let mut backup_frame_bytes = vec![0u8; length as usize];
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backup_file.read_exact(&mut backup_frame_bytes)?;
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let backup_frame: BackupFrame = BackupFrame::decode(&backup_frame_bytes[..])?;
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let header = backup_frame
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.header
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.ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, "Missing header"))?;
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Ok(HeaderData {
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initialisation_vector: header.iv.unwrap(),
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salt: header.salt.unwrap(),
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version: header.version,
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})
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}
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fn derive_keys(passphrase: &str, salt: &[u8]) -> io::Result<Keys> {
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let passphrase_bytes = passphrase.replace(" ", "").as_bytes().to_vec();
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let mut hash = passphrase_bytes.clone();
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let mut sha512 = Sha512::new();
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Digest::update(&mut sha512, salt);
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for _ in 0..250000 {
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Digest::update(&mut sha512, &hash);
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Digest::update(&mut sha512, &passphrase_bytes);
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hash = sha512.finalize_reset().to_vec();
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}
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let hkdf = Hkdf::<Sha256>::new(Some(b""), &hash[..32]);
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let mut keys = vec![0u8; 64];
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hkdf.expand(b"Backup Export", &mut keys)
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.map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "HKDF expand failed"))?;
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Ok(Keys {
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cipher_key: keys[..32].to_vec(),
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hmac_key: keys[32..].to_vec(),
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})
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}
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fn increment_initialisation_vector(initialisation_vector: &[u8]) -> Vec<u8> {
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let mut counter = u32::from_be_bytes(initialisation_vector[..4].try_into().unwrap());
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counter = (counter + 1) & 0xFFFFFFFF;
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let mut new_iv = counter.to_be_bytes().to_vec();
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new_iv.extend_from_slice(&initialisation_vector[4..]);
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new_iv
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}
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fn parameter_to_native_type(
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parameter: &signal::sql_statement::SqlParameter,
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) -> rusqlite::Result<Option<Box<dyn rusqlite::ToSql>>> {
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if let Some(s) = ¶meter.string_paramter {
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Ok(Some(Box::new(s.clone())))
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} else if let Some(i) = parameter.integer_parameter {
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let signed_i = if i & (1 << 63) != 0 {
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i | (-1_i64 << 63) as u64
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} else {
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i
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};
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Ok(Some(Box::new(signed_i as i64)))
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} else if let Some(d) = parameter.double_parameter {
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Ok(Some(Box::new(d)))
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} else if let Some(b) = ¶meter.blob_parameter {
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Ok(Some(Box::new(b.clone())))
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} else if parameter.nullparameter.is_some() {
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Ok(None)
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} else {
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Ok(None)
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}
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}
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fn decrypt_frame<R: Read>(
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backup_file: &mut R,
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hmac_key: &[u8],
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cipher_key: &[u8],
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initialisation_vector: &[u8],
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header_version: Option<u32>,
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ciphertext_buf: &mut Vec<u8>,
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plaintext_buf: &mut Vec<u8>,
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) -> io::Result<BackupFrame> {
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let mut hmac = <HmacSha256 as Mac>::new_from_slice(hmac_key)
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.map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "Invalid HMAC key"))?;
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let mut ctr =
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<Ctr32BE<Aes256> as KeyIvInit>::new_from_slices(cipher_key, initialisation_vector)
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.map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "Invalid CTR parameters"))?;
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let length = match header_version {
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None => {
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let mut length_bytes = [0u8; 4];
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backup_file.read_exact(&mut length_bytes)?;
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u32::from_be_bytes(length_bytes)
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}
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Some(1) => {
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let mut encrypted_length = [0u8; 4];
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backup_file.read_exact(&mut encrypted_length)?;
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Mac::update(&mut hmac, &encrypted_length);
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let mut decrypted_length = encrypted_length;
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ctr.apply_keystream(&mut decrypted_length);
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u32::from_be_bytes(decrypted_length)
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}
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Some(v) => {
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return Err(io::Error::new(
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io::ErrorKind::InvalidData,
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format!("Unsupported version: {}", v),
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))
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}
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};
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if length < 10 {
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return Err(io::Error::new(
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io::ErrorKind::InvalidData,
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"Frame too short",
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));
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}
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ciphertext_buf.clear();
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ciphertext_buf.resize((length - 10) as usize, 0);
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backup_file.read_exact(ciphertext_buf)?;
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let mut their_mac = [0u8; 10];
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backup_file.read_exact(&mut their_mac)?;
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Mac::update(&mut hmac, ciphertext_buf);
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let our_mac = hmac.finalize().into_bytes();
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if their_mac != our_mac[..10] {
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return Err(io::Error::new(
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io::ErrorKind::InvalidData,
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"MAC verification failed",
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));
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}
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plaintext_buf.clear();
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plaintext_buf.extend_from_slice(ciphertext_buf);
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ctr.apply_keystream(plaintext_buf);
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BackupFrame::decode(&plaintext_buf[..])
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.map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))
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}
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fn decrypt_frame_payload<R: Read>(
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backup_file: &mut R,
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length: usize,
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hmac_key: &[u8],
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cipher_key: &[u8],
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initialisation_vector: &[u8],
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chunk_size: usize,
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) -> io::Result<Vec<u8>> {
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let mut hmac = <HmacSha256 as Mac>::new_from_slice(hmac_key)
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.map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "Invalid HMAC key"))?;
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Mac::update(&mut hmac, initialisation_vector);
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let mut ctr =
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<Ctr32BE<Aes256> as KeyIvInit>::new_from_slices(cipher_key, initialisation_vector)
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.map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "Invalid CTR parameters"))?;
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let mut decrypted_data = Vec::new();
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let mut remaining_length = length;
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while remaining_length > 0 {
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let this_chunk_length = remaining_length.min(chunk_size);
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remaining_length -= this_chunk_length;
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let mut ciphertext = vec![0u8; this_chunk_length];
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backup_file.read_exact(&mut ciphertext)?;
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Mac::update(&mut hmac, &ciphertext);
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let mut decrypted_chunk = ciphertext;
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ctr.apply_keystream(&mut decrypted_chunk);
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decrypted_data.extend(decrypted_chunk);
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}
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let mut their_mac = [0u8; 10];
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backup_file.read_exact(&mut their_mac)?;
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let our_mac = hmac.finalize().into_bytes();
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if &their_mac != &our_mac[..10] {
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return Err(io::Error::new(
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io::ErrorKind::InvalidData,
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"Bad MAC found. Passphrase may be incorrect or file corrupted or incompatible.",
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));
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}
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Ok(decrypted_data)
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}
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fn decrypt_backup<R>(
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backup_file: &mut R,
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passphrase: &str,
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output_directory: &Path,
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) -> io::Result<()>
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where
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R: Read + Seek,
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{
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let mut backup_file = BufReader::with_capacity(32 * 1024, backup_file);
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let total_size = backup_file.seek(SeekFrom::End(0))?;
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backup_file.seek(SeekFrom::Start(0))?;
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let mut last_percentage = 0;
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let database_filename = output_directory.join("database.sqlite");
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let preferences_filename = output_directory.join("preferences.json");
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let key_value_filename = output_directory.join("key_value.json");
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let attachments_directory = output_directory.join("attachments");
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let stickers_directory = output_directory.join("stickers");
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let avatars_directory = output_directory.join("avatars");
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for directory in [
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output_directory,
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&attachments_directory,
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&stickers_directory,
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&avatars_directory,
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] {
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fs::create_dir_all(directory)?;
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}
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if database_filename.exists() {
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fs::remove_file(&database_filename)?;
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}
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let mut db_connection = Connection::open(&database_filename).map_err(to_io_error)?;
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db_connection
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.execute_batch(
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"PRAGMA journal_mode = WAL;
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PRAGMA synchronous = NORMAL;
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PRAGMA temp_store = MEMORY;
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PRAGMA mmap_size = 30000000000;
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PRAGMA page_size = 4096;",
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)
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.map_err(to_io_error)?;
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let tx = db_connection
|
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.transaction_with_behavior(TransactionBehavior::Immediate)
|
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.map_err(to_io_error)?;
|
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|
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let mut preferences: HashMap<String, HashMap<String, HashMap<String, serde_json::Value>>> =
|
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HashMap::new();
|
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let mut key_values: HashMap<String, HashMap<String, serde_json::Value>> = HashMap::new();
|
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|
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let header_data = read_backup_header(&mut backup_file)?;
|
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let keys = derive_keys(passphrase, &header_data.salt)?;
|
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let mut initialisation_vector = header_data.initialisation_vector.clone();
|
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|
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let mut ciphertext: Vec<u8> = Vec::with_capacity(1024 * 1024);
|
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let mut plaintext: Vec<u8> = Vec::with_capacity(1024 * 1024);
|
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|
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loop {
|
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let current_position = backup_file.stream_position()?;
|
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let percentage = ((current_position as f64 / total_size as f64) * 100.0) as u32;
|
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if percentage != last_percentage {
|
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eprintln!("Progress: {}%", percentage);
|
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last_percentage = percentage;
|
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}
|
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|
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let backup_frame = decrypt_frame(
|
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&mut backup_file,
|
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&keys.hmac_key,
|
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&keys.cipher_key,
|
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&initialisation_vector,
|
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header_data.version,
|
||||
&mut ciphertext,
|
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&mut plaintext,
|
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)?;
|
||||
|
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initialisation_vector = increment_initialisation_vector(&initialisation_vector);
|
||||
|
||||
if backup_frame.end.unwrap_or(false) {
|
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break;
|
||||
} else if let Some(version) = backup_frame.version {
|
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if let Some(ver_num) = version.version {
|
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let pragma_sql = format!("PRAGMA user_version = {}", ver_num);
|
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tx.execute_batch(&pragma_sql).map_err(to_io_error)?;
|
||||
}
|
||||
} else if let Some(statement) = backup_frame.statement {
|
||||
if let Some(sql) = statement.statement {
|
||||
if !sql.to_lowercase().starts_with("create table sqlite_")
|
||||
&& !sql.contains("sms_fts_")
|
||||
&& !sql.contains("mms_fts_")
|
||||
{
|
||||
let params: Vec<Option<Box<dyn rusqlite::ToSql>>> = statement
|
||||
.parameters
|
||||
.iter()
|
||||
.map(parameter_to_native_type)
|
||||
.collect::<Result<_, _>>()
|
||||
.map_err(to_io_error)?;
|
||||
|
||||
tx.execute(
|
||||
&sql,
|
||||
rusqlite::params_from_iter(params.iter().map(|p| p.as_deref())),
|
||||
)
|
||||
.map_err(to_io_error)?;
|
||||
}
|
||||
}
|
||||
} else if let Some(preference) = backup_frame.preference {
|
||||
let value_dict = preferences
|
||||
.entry(preference.file.unwrap_or_default())
|
||||
.or_default()
|
||||
.entry(preference.key.unwrap_or_default())
|
||||
.or_default();
|
||||
|
||||
if let Some(value) = preference.value {
|
||||
value_dict.insert("value".to_string(), serde_json::Value::String(value));
|
||||
}
|
||||
if let Some(boolean_value) = preference.boolean_value {
|
||||
value_dict.insert(
|
||||
"booleanValue".to_string(),
|
||||
serde_json::Value::Bool(boolean_value),
|
||||
);
|
||||
}
|
||||
if preference.is_string_set_value.unwrap_or(false) {
|
||||
value_dict.insert(
|
||||
"stringSetValue".to_string(),
|
||||
serde_json::Value::Array(
|
||||
preference
|
||||
.string_set_value
|
||||
.into_iter()
|
||||
.map(serde_json::Value::String)
|
||||
.collect(),
|
||||
),
|
||||
);
|
||||
}
|
||||
} else if let Some(key_value) = backup_frame.key_value {
|
||||
let value_dict = key_values
|
||||
.entry(key_value.key.unwrap_or_default())
|
||||
.or_default();
|
||||
|
||||
if let Some(boolean_value) = key_value.boolean_value {
|
||||
value_dict.insert(
|
||||
"booleanValue".to_string(),
|
||||
serde_json::Value::Bool(boolean_value),
|
||||
);
|
||||
}
|
||||
if let Some(float_value) = key_value.float_value {
|
||||
value_dict.insert(
|
||||
"floatValue".to_string(),
|
||||
serde_json::Value::Number(
|
||||
serde_json::Number::from_f64(float_value.into()).unwrap(),
|
||||
),
|
||||
);
|
||||
}
|
||||
if let Some(integer_value) = key_value.integer_value {
|
||||
value_dict.insert(
|
||||
"integerValue".to_string(),
|
||||
serde_json::Value::Number(integer_value.into()),
|
||||
);
|
||||
}
|
||||
if let Some(long_value) = key_value.long_value {
|
||||
value_dict.insert(
|
||||
"longValue".to_string(),
|
||||
serde_json::Value::Number(long_value.into()),
|
||||
);
|
||||
}
|
||||
if let Some(string_value) = key_value.string_value {
|
||||
value_dict.insert(
|
||||
"stringValue".to_string(),
|
||||
serde_json::Value::String(string_value),
|
||||
);
|
||||
}
|
||||
if let Some(blob_value) = key_value.blob_value {
|
||||
value_dict.insert(
|
||||
"blobValueBase64".to_string(),
|
||||
serde_json::Value::String(BASE64_STANDARD.encode(&blob_value)),
|
||||
);
|
||||
}
|
||||
} else {
|
||||
let (filename, length) = if let Some(attachment) = backup_frame.attachment {
|
||||
(
|
||||
attachments_directory.join(format!("{}.bin", attachment.row_id.unwrap_or(0))),
|
||||
attachment.length.unwrap_or(0),
|
||||
)
|
||||
} else if let Some(sticker) = backup_frame.sticker {
|
||||
(
|
||||
stickers_directory.join(format!("{}.bin", sticker.row_id.unwrap_or(0))),
|
||||
sticker.length.unwrap_or(0),
|
||||
)
|
||||
} else if let Some(avatar) = backup_frame.avatar {
|
||||
(
|
||||
avatars_directory
|
||||
.join(format!("{}.bin", avatar.recipient_id.unwrap_or_default())),
|
||||
avatar.length.unwrap_or(0),
|
||||
)
|
||||
} else {
|
||||
return Err(io::Error::new(
|
||||
io::ErrorKind::InvalidData,
|
||||
"Invalid field type found",
|
||||
));
|
||||
};
|
||||
|
||||
let mut file = File::create(&filename)?;
|
||||
let payload = decrypt_frame_payload(
|
||||
&mut backup_file,
|
||||
length as usize,
|
||||
&keys.hmac_key,
|
||||
&keys.cipher_key,
|
||||
&initialisation_vector,
|
||||
8 * 1024,
|
||||
)?;
|
||||
file.write_all(&payload)?;
|
||||
initialisation_vector = increment_initialisation_vector(&initialisation_vector);
|
||||
}
|
||||
}
|
||||
|
||||
tx.commit().map_err(to_io_error)?;
|
||||
|
||||
let mut preferences_file = File::create(preferences_filename)?;
|
||||
serde_json::to_writer_pretty(&mut preferences_file, &preferences)
|
||||
.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
|
||||
|
||||
let mut key_values_file = File::create(key_value_filename)?;
|
||||
serde_json::to_writer_pretty(&mut key_values_file, &key_values)
|
||||
.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn main() -> io::Result<()> {
|
||||
let args: Vec<String> = std::env::args().collect();
|
||||
if args.len() < 2 {
|
||||
eprintln!(
|
||||
"Usage: {} <backup_file> [output_directory] [-p PASSPHRASE]",
|
||||
args[0]
|
||||
);
|
||||
std::process::exit(1);
|
||||
}
|
||||
|
||||
let backup_file_path = &args[1];
|
||||
let output_directory = if args.len() > 2 {
|
||||
Path::new(&args[2]).to_path_buf()
|
||||
} else {
|
||||
Path::new("./out").to_path_buf()
|
||||
};
|
||||
|
||||
let passphrase = if let Some(pos) = args.iter().position(|arg| arg == "-p") {
|
||||
args.get(pos + 1).expect("Passphrase not provided").clone()
|
||||
} else {
|
||||
rpassword::prompt_password("Backup passphrase: ").expect("Failed to read passphrase")
|
||||
};
|
||||
|
||||
let mut backup_file = File::open(backup_file_path)?;
|
||||
decrypt_backup(&mut backup_file, &passphrase, &output_directory)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
2705
src/proto/Backups.rs
Normal file
2705
src/proto/Backups.rs
Normal file
File diff suppressed because it is too large
Load diff
3
src/proto/mod.rs
Normal file
3
src/proto/mod.rs
Normal file
|
|
@ -0,0 +1,3 @@
|
|||
// @generated
|
||||
|
||||
pub mod Backups;
|
||||
Loading…
Add table
Add a link
Reference in a new issue