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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..eb4078f --- /dev/null +++ b/README.md @@ -0,0 +1,32 @@ +# redox-ssh + +A ssh client and server written entirely on rust, primarily targeted at (http://redox-os.org). + +## Features + +Currently implemented features, ordered by priority: + + [ ] SSH Server + [ ] SSH Client + [ ] Encryption + [ ] Public key authentication + [ ] Port forwarding + [ ] SCP File Transfers + +## License + + Redox SSH + Copyright (C) 2017 Thomas Gatzweiler + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . diff --git a/src/auth.rs b/src/auth.rs new file mode 100644 index 0000000..9b30812 --- /dev/null +++ b/src/auth.rs @@ -0,0 +1,9 @@ +pub enum AuthMethod { + PublicKey, Password, HostBased, None +} + +pub struct AuthRequest { + user: String, + service: String, + method: AuthMethod +} diff --git a/src/bin/ssh.rs b/src/bin/ssh.rs new file mode 100644 index 0000000..d018d0c --- /dev/null +++ b/src/bin/ssh.rs @@ -0,0 +1,3 @@ +pub fn main() { + println!("Hello from ssh!"); +} diff --git a/src/bin/sshd.rs b/src/bin/sshd.rs new file mode 100644 index 0000000..63349e9 --- /dev/null +++ b/src/bin/sshd.rs @@ -0,0 +1,10 @@ +extern crate ssh; + +use std::env; +use ssh::{Server, ServerConfig}; + +pub fn main() { + let config = ServerConfig { host: String::from("0.0.0.0:22222") }; + let server = Server::with_config(config); + server.start(); +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..b444d6e --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,13 @@ +extern crate byteorder; +#[macro_use] +extern crate log; +#[macro_use] +extern crate nom; + +pub mod protocol; +pub mod server; +pub mod packet; +pub mod parser; +pub mod message; + +pub use self::server::{Server, ServerConfig}; diff --git a/src/message/kex.rs b/src/message/kex.rs new file mode 100644 index 0000000..7d73e69 --- /dev/null +++ b/src/message/kex.rs @@ -0,0 +1,163 @@ +use std::str::FromStr; + +#[derive(Debug)] +pub struct KeyExchangeInit { + pub cookie: Vec, + pub kex_algorithms: Vec, + pub server_host_key_algorithms: Vec, + pub encryption_algorithms_client_to_server: Vec, + pub encryption_algorithms_server_to_client: Vec, + pub mac_algorithms_client_to_server: Vec, + pub mac_algorithms_server_to_client: Vec, + pub compression_algorithms_client_to_server: Vec, + pub compression_algorithms_server_to_client: Vec, + pub languages_client_to_server: Vec, + pub languages_server_to_client: Vec, + pub first_kex_packet_follows: bool +} + +#[derive(Debug)] +#[allow(non_camel_case_types)] +pub enum KeyExchangeAlgorithm { + CURVE25519_SHA256, + ECDH_SHA2_NISTP256, + ECDH_SHA2_NISTP384, + ECDH_SHA2_NISTP521, + DH_GROUP_EXCHANGE_SHA256, + DH_GROUP_EXCHANGE_SHA1, + DH_GROUP16_SHA512, + DH_GROUP18_SHA512, + DH_GROUP14_SHA256, + DH_GROUP14_SHA1, + EXT_INFO_C +} + +impl FromStr for KeyExchangeAlgorithm { + type Err = (); + fn from_str(s: &str) -> Result { + match s { + "curve25519-sha256" => + Ok(KeyExchangeAlgorithm::CURVE25519_SHA256), + "ecdh-sha2-nistp256" => + Ok(KeyExchangeAlgorithm::ECDH_SHA2_NISTP256), + "ecdh-sha2-nistp384" => + Ok(KeyExchangeAlgorithm::ECDH_SHA2_NISTP384), + "ecdh-sha2-nistp521" => + Ok(KeyExchangeAlgorithm::ECDH_SHA2_NISTP521), + "diffie-hellman-group16-sha512" => + Ok(KeyExchangeAlgorithm::DH_GROUP16_SHA512), + "diffie-hellman-group18-sha512" => + Ok(KeyExchangeAlgorithm::DH_GROUP18_SHA512), + "diffie-hellman-group14-sha256" => + Ok(KeyExchangeAlgorithm::DH_GROUP14_SHA256), + "diffie-hellman-group14-sha1" => + Ok(KeyExchangeAlgorithm::DH_GROUP14_SHA1), + "diffie-hellman-group-exchange-sha256" => + Ok(KeyExchangeAlgorithm::DH_GROUP_EXCHANGE_SHA256), + "diffie-hellman-group-exchange-sha1" => + Ok(KeyExchangeAlgorithm::DH_GROUP_EXCHANGE_SHA1), + "ext-info-c" => + Ok(KeyExchangeAlgorithm::EXT_INFO_C), + _ => { println!("Unknown kex algorithm: {}", s); Err(()) } + } + } +} + + +#[derive(Debug)] +#[allow(non_camel_case_types)] +pub enum HostKeyAlgorithm { + SSH_RSA, + RSA_SHA2_256, + RSA_SHA2_512, + ECDSA_SHA2_NISTP256, + ECDSA_SHA2_NISTP384, + ECDSA_SHA2_NISTP521, + SSH_ED25519 +} + +impl FromStr for HostKeyAlgorithm { + type Err = (); + fn from_str(s: &str) -> Result { + match s { + "ssh-rsa" => Ok(HostKeyAlgorithm::SSH_RSA), + "rsa-sha2-256" => Ok(HostKeyAlgorithm::RSA_SHA2_256), + "rsa-sha2-512" => Ok(HostKeyAlgorithm::RSA_SHA2_512), + "ecdsa-sha2-nistp256" => Ok(HostKeyAlgorithm::ECDSA_SHA2_NISTP256), + "ecdsa-sha2-nistp384" => Ok(HostKeyAlgorithm::ECDSA_SHA2_NISTP384), + "ecdsa-sha2-nistp521" => Ok(HostKeyAlgorithm::ECDSA_SHA2_NISTP521), + "ssh-ed25519" => Ok(HostKeyAlgorithm::SSH_ED25519), + _ => { println!("Unknown host key algorithm: {}", s); Err(()) } + } + } +} + +#[derive(Debug)] +#[allow(non_camel_case_types)] +pub enum EncryptionAlgorithm { + AES128_CTR, + AES128_CBC, + AES192_CTR, + AES192_CBC, + AES256_CTR, + AES256_CBC, + None +} + +impl FromStr for EncryptionAlgorithm { + type Err = (); + fn from_str(s: &str) -> Result { + match s { + "aes128-ctr" => Ok(EncryptionAlgorithm::AES128_CTR), + "aes128-cbc" => Ok(EncryptionAlgorithm::AES128_CBC), + "aes192-ctr" => Ok(EncryptionAlgorithm::AES192_CTR), + "aes192-cbc" => Ok(EncryptionAlgorithm::AES192_CBC), + "aes256-ctr" => Ok(EncryptionAlgorithm::AES256_CTR), + "aes256-cbc" => Ok(EncryptionAlgorithm::AES256_CBC), + "none" => Ok(EncryptionAlgorithm::None), + _ => { println!("Unknown encryption algorithm: `{}`", s); Err(()) } + } + } +} + +#[derive(Debug)] +#[allow(non_camel_case_types)] +pub enum MacAlgorithm { + HMAC_SHA1, + HMAC_SHA2_256, + HMAC_SHA2_512, + None +} + +impl FromStr for MacAlgorithm { + type Err = (); + fn from_str(s: &str) -> Result { + match s { + "hmac-sha1" => Ok(MacAlgorithm::HMAC_SHA1), + "hmac-sha2-256" => Ok(MacAlgorithm::HMAC_SHA2_256), + "hmac-sha2-512" => Ok(MacAlgorithm::HMAC_SHA2_512), + _ => { println!("Unknown mac algorithm: {}", s); Err(()) } + } + } +} + +#[derive(Debug)] +pub enum CompressionAlgorithm { + Zlib, + None +} + +impl FromStr for CompressionAlgorithm { + type Err = (); + fn from_str(s: &str) -> Result { + match s { + "zlib" => Ok(CompressionAlgorithm::Zlib), + "none" => Ok(CompressionAlgorithm::None), + _ => { println!("Unknown compression algorithm: {}", s); Err(()) } + } + } +} + +#[derive(Debug)] +pub struct Language(pub String); + diff --git a/src/message/mod.rs b/src/message/mod.rs new file mode 100644 index 0000000..3303006 --- /dev/null +++ b/src/message/mod.rs @@ -0,0 +1,33 @@ +pub mod kex; + +#[derive(Debug)] +pub enum Message { + Disconnect, + Ignore, + Unimplemented, + Debug, + ServiceRequest, + ServiceAccept, + KexInit(kex::KeyExchangeInit), + NewKeys, + UserAuthRequest, + UserAuthFailure, + UserAuthSuccess, + UserAuthBanner, + GlobalRequest, + RequestSuccess, + RequestFailure, + ChannelOpen, + ChannelOpenConfirmation, + ChannelOpenFailure, + ChannelWindowAdjust, + ChannelData, + ChannelExtendedData, + ChannelEOF, + ChannelClose, + ChannelRequest, + ChannelSuccess, + ChannelFailure, + Unknown +} + diff --git a/src/packet.rs b/src/packet.rs new file mode 100644 index 0000000..3326425 --- /dev/null +++ b/src/packet.rs @@ -0,0 +1,21 @@ +use std::fmt; +use std::str; +use parser; + +pub struct Packet { + pub payload: Vec, + pub mac: Vec +} + +impl Packet { + pub fn parse(&self) { + let result = parser::parse_packet(&self.payload.as_slice()); + println!("{:?}", result); + } +} + +impl fmt::Debug for Packet { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + write!(f, "Packet({} bytes)", self.payload.len()) + } +} diff --git a/src/parser.rs b/src/parser.rs new file mode 100644 index 0000000..57fcd6b --- /dev/null +++ b/src/parser.rs @@ -0,0 +1,81 @@ +use std::str; +use std::str::FromStr; +use nom::{IResult, Endianness}; +use message::*; + +macro_rules! enum_list ( + ($i:expr, $name:ty) => ( + parse_enum_list::<$name>($i) + ); +); + +named!(pub parse_packet, + map!(parse_keyx_init, |m| Message::KexInit(m)) +); + +named!(parse_keyx_init<&[u8], kex::KeyExchangeInit>, do_parse!(tag!(&[20]) >> + cookie: take!(16) >> + kex_algos: enum_list!(kex::KeyExchangeAlgorithm) >> + server_host_key_algos: enum_list!(kex::HostKeyAlgorithm) >> + enc_algos_c2s: enum_list!(kex::EncryptionAlgorithm) >> + enc_algos_s2c: enum_list!(kex::EncryptionAlgorithm) >> + mac_algos_c2s: enum_list!(kex::MacAlgorithm) >> + mac_algos_s2c: enum_list!(kex::MacAlgorithm) >> + comp_algos_c2s: enum_list!(kex::CompressionAlgorithm) >> + comp_algos_s2c: enum_list!(kex::CompressionAlgorithm) >> + langs_c2s: parse_name_list >> + langs_s2c: parse_name_list >> + first_kex_packet_follows: parse_bool >> + reserved: u32!(Endianness::Big) >> + (kex::KeyExchangeInit { + cookie: cookie.to_vec(), + kex_algorithms: kex_algos, + server_host_key_algorithms: server_host_key_algos, + encryption_algorithms_client_to_server: enc_algos_c2s, + encryption_algorithms_server_to_client: enc_algos_s2c, + mac_algorithms_client_to_server: mac_algos_c2s, + mac_algorithms_server_to_client: mac_algos_s2c, + compression_algorithms_client_to_server: comp_algos_c2s, + compression_algorithms_server_to_client: comp_algos_s2c, + languages_client_to_server: + langs_c2s + .iter() + .filter(|s| !s.is_empty()) + .map(|lang| kex::Language(lang.to_string())) + .collect(), + languages_server_to_client: + langs_c2s + .iter() + .filter(|s| !s.is_empty()) + .map(|lang| kex::Language(lang.to_string())) + .collect(), + first_kex_packet_follows: first_kex_packet_follows + }) +)); + +named!(parse_bool<&[u8], bool>, + map!(take!(1), |i: &[u8]| i[0] != 0) +); + +named!(parse_string<&[u8], &[u8]>, + do_parse!(len: u32!(Endianness::Big) >> + data: take!(len) >> + (data) + ) +); + +named!(parse_name_list<&[u8], Vec<&str>>, + map_res!(parse_string, |s| str::from_utf8(s).map(|s| s.split(",").collect())) +); + +pub fn parse_enum_list(i: &[u8]) -> IResult<&[u8], Vec> { + match parse_name_list(i) { + IResult::Done(i, list) => IResult::Done(i, + list.iter() + .filter_map(|l| T::from_str(&l).ok()) + .collect() + ), + IResult::Error(e) => IResult::Error(e), + IResult::Incomplete(n) => IResult::Incomplete(n) + } +} diff --git a/src/protocol.rs b/src/protocol.rs new file mode 100644 index 0000000..9797f74 --- /dev/null +++ b/src/protocol.rs @@ -0,0 +1,45 @@ +use std::io::{Read, Write, BufReader, BufRead}; +use std::io; +use byteorder::{ReadBytesExt, BigEndian}; + +use packet::Packet; + +pub fn send_identification(stream: &mut W) -> io::Result { + let id = format!("SSH-2.0-RedoxSSH_{}\r\n", env!("CARGO_PKG_VERSION")); + stream.write(id.as_bytes()) +} + +pub fn read_identification(stream: &mut R) -> io::Result { + // The identification string has a maximum length of 255 bytes + // TODO: Make sure that we stop reading when the client sends more than that + + let mut reader = BufReader::new(stream); + let mut id = String::new(); + + while !id.starts_with("SSH-") { + reader.read_line(&mut id)?; + } + + Ok(id.trim_right().to_owned()) +} + +pub fn read_packet(stream: &mut R, mac_len: usize) -> io::Result { + let packet_len = stream.read_u32::()? as usize; + let padding_len = stream.read_u8()? as usize; + let payload_len = packet_len - padding_len - 1; + + // TODO: Prevent packets that are too large + + let mut payload = Vec::with_capacity(payload_len); + let mut padding = Vec::with_capacity(padding_len); + let mut mac = Vec::with_capacity(mac_len); + + stream.take(payload_len as u64).read_to_end(&mut payload)?; + stream.take(padding_len as u64).read_to_end(&mut padding)?; + + if mac_len > 0 { + stream.take(mac_len as u64).read_to_end(&mut mac); + } + + Ok(Packet { payload: payload, mac: mac }) +} diff --git a/src/server.rs b/src/server.rs new file mode 100644 index 0000000..f1762ca --- /dev/null +++ b/src/server.rs @@ -0,0 +1,41 @@ +use std::net::TcpListener; +use std::io; + +use protocol; + +pub struct ServerConfig { + pub host: String +} + +pub struct Server { + config: ServerConfig +} + +impl Server { + pub fn with_config(config: ServerConfig) -> Server { + Server { config: config } + } + + pub fn start(&self) -> io::Result<()> { + let listener = TcpListener::bind(&*self.config.host) + .expect(&*format!("Failed to bind to {}.", self.config.host)); + let (mut stream, addr) = listener.accept() + .expect(&*format!("Failed to establish incomin connection.")); + + println!("Connection established!"); + + let id = protocol::read_identification(&mut stream)?; + println!("Incoming connection from {}", id); + + protocol::send_identification(&mut stream)?; + + loop { + let packet = protocol::read_packet(&mut stream, 0)?; + let message = packet.parse(); + + + println!("{:?}", message); + } + Ok(()) + } +}