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Thomas Gatzweiler 2017-07-11 18:30:48 +02:00
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/target/
**/*.rs.bk

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Cargo.toml Normal file
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[package]
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authors = ["Thomas Gatzweiler <mail@thomasgatzweiler.com>"]
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LICENSE Normal file
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
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might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. 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
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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# 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 <http://www.gnu.org/licenses/>.

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pub enum AuthMethod {
PublicKey, Password, HostBased, None
}
pub struct AuthRequest {
user: String,
service: String,
method: AuthMethod
}

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pub fn main() {
println!("Hello from ssh!");
}

10
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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();
}

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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};

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use std::str::FromStr;
#[derive(Debug)]
pub struct KeyExchangeInit {
pub cookie: Vec<u8>,
pub kex_algorithms: Vec<KeyExchangeAlgorithm>,
pub server_host_key_algorithms: Vec<HostKeyAlgorithm>,
pub encryption_algorithms_client_to_server: Vec<EncryptionAlgorithm>,
pub encryption_algorithms_server_to_client: Vec<EncryptionAlgorithm>,
pub mac_algorithms_client_to_server: Vec<MacAlgorithm>,
pub mac_algorithms_server_to_client: Vec<MacAlgorithm>,
pub compression_algorithms_client_to_server: Vec<CompressionAlgorithm>,
pub compression_algorithms_server_to_client: Vec<CompressionAlgorithm>,
pub languages_client_to_server: Vec<Language>,
pub languages_server_to_client: Vec<Language>,
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<KeyExchangeAlgorithm, ()> {
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<HostKeyAlgorithm, ()> {
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<EncryptionAlgorithm, ()> {
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<MacAlgorithm, ()> {
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<CompressionAlgorithm, ()> {
match s {
"zlib" => Ok(CompressionAlgorithm::Zlib),
"none" => Ok(CompressionAlgorithm::None),
_ => { println!("Unknown compression algorithm: {}", s); Err(()) }
}
}
}
#[derive(Debug)]
pub struct Language(pub String);

33
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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
}

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use std::fmt;
use std::str;
use parser;
pub struct Packet {
pub payload: Vec<u8>,
pub mac: Vec<u8>
}
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())
}
}

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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<Message>,
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<T: FromStr>(i: &[u8]) -> IResult<&[u8], Vec<T>> {
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)
}
}

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use std::io::{Read, Write, BufReader, BufRead};
use std::io;
use byteorder::{ReadBytesExt, BigEndian};
use packet::Packet;
pub fn send_identification<W: Write>(stream: &mut W) -> io::Result<usize> {
let id = format!("SSH-2.0-RedoxSSH_{}\r\n", env!("CARGO_PKG_VERSION"));
stream.write(id.as_bytes())
}
pub fn read_identification<R: Read>(stream: &mut R) -> io::Result<String> {
// 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<R: Read>(stream: &mut R, mac_len: usize) -> io::Result<Packet> {
let packet_len = stream.read_u32::<BigEndian>()? 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 })
}

41
src/server.rs Normal file
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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(())
}
}