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cleanup
This commit is contained in:
parent
aa96faa697
commit
0eb9001f08
7 changed files with 445 additions and 409 deletions
517
ssh-transport/src/lib.rs
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517
ssh-transport/src/lib.rs
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@ -0,0 +1,517 @@
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mod packet;
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mod parse;
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use core::str;
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use std::mem::take;
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use ed25519_dalek::ed25519::signature::Signer;
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use packet::{
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DhKeyExchangeInitPacket, DhKeyExchangeInitReplyPacket, KeyExchangeInitPacket, Packet,
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PacketTransport, SshPublicKey, SshSignature,
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};
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use parse::{MpInt, NameList};
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use rand::RngCore;
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use sha2::Digest;
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use x25519_dalek::{EphemeralSecret, PublicKey};
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#[derive(Debug)]
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pub enum SshError {
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/// The client did something wrong.
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/// The connection should be closed and a notice may be logged,
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/// but this does not require operator intervention.
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ClientError(String),
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/// Something went wrong on the server.
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/// The connection should be closed and an error should be logged.
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ServerError(eyre::Report),
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}
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pub type Result<T, E = SshError> = std::result::Result<T, E>;
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impl From<eyre::Report> for SshError {
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fn from(value: eyre::Report) -> Self {
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Self::ServerError(value)
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}
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}
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// This is definitely who we are.
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pub const SERVER_IDENTIFICATION: &[u8] = b"SSH-2.0-OpenSSH_9.7\r\n";
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pub struct ServerConnection {
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state: ServerState,
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packet_transport: PacketTransport,
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send_queue: Vec<Msg>,
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rng: Box<dyn SshRng + Send + Sync>,
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}
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enum ServerState {
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ProtoExchange {
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received: Vec<u8>,
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},
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KeyExchangeInit {
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client_identification: Vec<u8>,
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},
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DhKeyInit {
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client_identification: Vec<u8>,
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client_kexinit: Vec<u8>,
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server_kexinit: Vec<u8>,
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},
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NewKeys,
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ServiceRequest {},
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}
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pub trait SshRng {
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fn fill_bytes(&mut self, dest: &mut [u8]);
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}
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struct SshRngRandAdapter<'a>(&'a mut dyn SshRng);
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impl rand::CryptoRng for SshRngRandAdapter<'_> {}
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impl rand::RngCore for SshRngRandAdapter<'_> {
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fn next_u32(&mut self) -> u32 {
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self.next_u64() as u32
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}
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fn next_u64(&mut self) -> u64 {
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rand_core::impls::next_u64_via_fill(self)
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}
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fn fill_bytes(&mut self, dest: &mut [u8]) {
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self.0.fill_bytes(dest);
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}
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fn try_fill_bytes(&mut self, dest: &mut [u8]) -> std::result::Result<(), rand::Error> {
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Ok(self.fill_bytes(dest))
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}
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}
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pub struct ThreadRngRand;
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impl SshRng for ThreadRngRand {
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fn fill_bytes(&mut self, dest: &mut [u8]) {
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rand::thread_rng().fill_bytes(dest);
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}
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}
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impl ServerConnection {
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pub fn new(rng: impl SshRng + Send + Sync + 'static) -> Self {
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Self {
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state: ServerState::ProtoExchange {
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received: Vec::new(),
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},
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packet_transport: PacketTransport::new(),
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send_queue: Vec::new(),
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rng: Box::new(rng),
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}
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}
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}
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impl ServerConnection {
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pub fn recv_bytes(&mut self, bytes: &[u8]) -> Result<()> {
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if let ServerState::ProtoExchange { received } = &mut self.state {
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received.extend_from_slice(bytes);
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if received.windows(2).find(|win| win == b"\r\n").is_some() {
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// TODO: care that its SSH 2.0 instead of anythin anything else
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// The client will not send any more information than this until we respond, so discord the rest of the bytes.
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let client_identification = received.to_owned();
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self.queue_msg(MsgKind::ServerProtocolInfo);
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self.state = ServerState::KeyExchangeInit {
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client_identification,
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};
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}
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// This means that we must be called at least twice, which is fine I think.
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return Ok(());
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}
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self.packet_transport.recv_bytes(bytes)?;
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while let Some(packet) = self.packet_transport.next_packet() {
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match &mut self.state {
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ServerState::ProtoExchange { .. } => unreachable!("handled above"),
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ServerState::KeyExchangeInit {
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client_identification,
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} => {
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let kex = KeyExchangeInitPacket::parse(&packet.payload)?;
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let require_algorithm =
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|expected: &'static str, list: NameList<'_>| -> Result<&'static str> {
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if list.iter().any(|alg| alg == expected) {
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Ok(expected)
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} else {
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Err(client_error!(
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"client does not supported algorithm {expected}"
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))
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}
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};
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let key_algorithm = require_algorithm("curve25519-sha256", kex.kex_algorithms)?;
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let server_host_key_algorithm =
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require_algorithm("ssh-ed25519", kex.server_host_key_algorithms)?;
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let encryption_algorithm_client_to_server = require_algorithm(
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"chacha20-poly1305@openssh.com",
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kex.encryption_algorithms_client_to_server,
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)?;
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let encryption_algorithm_server_to_client = require_algorithm(
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"chacha20-poly1305@openssh.com",
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kex.encryption_algorithms_server_to_client,
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)?;
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let mac_algorithm_client_to_server =
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require_algorithm("hmac-sha2-256", kex.mac_algorithms_client_to_server)?;
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let mac_algorithm_server_to_client =
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require_algorithm("hmac-sha2-256", kex.mac_algorithms_server_to_client)?;
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let compression_algorithm_client_to_server =
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require_algorithm("none", kex.compression_algorithms_client_to_server)?;
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let compression_algorithm_server_to_client =
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require_algorithm("none", kex.compression_algorithms_server_to_client)?;
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let _ = kex.languages_client_to_server;
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let _ = kex.languages_server_to_client;
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if kex.first_kex_packet_follows {
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return Err(client_error!(
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"the client wants to send a guessed packet, that's annoying :("
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));
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}
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let server_kexinit = KeyExchangeInitPacket {
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cookie: [0; 16],
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kex_algorithms: NameList::one(key_algorithm),
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server_host_key_algorithms: NameList::one(server_host_key_algorithm),
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encryption_algorithms_client_to_server: NameList::one(
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encryption_algorithm_client_to_server,
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),
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encryption_algorithms_server_to_client: NameList::one(
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encryption_algorithm_server_to_client,
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),
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mac_algorithms_client_to_server: NameList::one(
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mac_algorithm_client_to_server,
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),
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mac_algorithms_server_to_client: NameList::one(
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mac_algorithm_server_to_client,
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),
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compression_algorithms_client_to_server: NameList::one(
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compression_algorithm_client_to_server,
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),
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compression_algorithms_server_to_client: NameList::one(
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compression_algorithm_server_to_client,
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),
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languages_client_to_server: NameList::none(),
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languages_server_to_client: NameList::none(),
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first_kex_packet_follows: false,
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};
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let client_identification = take(client_identification);
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let server_kexinit_payload = server_kexinit.to_bytes();
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self.queue_msg(MsgKind::Packet(Packet {
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payload: server_kexinit_payload.clone(),
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}));
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self.state = ServerState::DhKeyInit {
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client_identification,
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client_kexinit: packet.payload,
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server_kexinit: server_kexinit_payload,
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};
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}
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ServerState::DhKeyInit {
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client_identification,
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client_kexinit,
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server_kexinit,
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} => {
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let dh = DhKeyExchangeInitPacket::parse(&packet.payload)?;
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let secret =
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EphemeralSecret::random_from_rng(SshRngRandAdapter(&mut *self.rng));
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let server_public_key = PublicKey::from(&secret); // f
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let client_public_key = dh.e; // e
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let shared_secret =
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secret.diffie_hellman(&client_public_key.to_x25519_public_key()?); // k
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let pub_hostkey = SshPublicKey {
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format: b"ssh-ed25519",
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data: PUB_HOSTKEY_BYTES,
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};
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let mut hash = sha2::Sha256::new();
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let add_hash = |hash: &mut sha2::Sha256, bytes: &[u8]| {
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hash.update(bytes);
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};
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let hash_string = |hash: &mut sha2::Sha256, bytes: &[u8]| {
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add_hash(hash, &u32::to_be_bytes(bytes.len() as u32));
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add_hash(hash, bytes);
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};
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let hash_mpint = |hash: &mut sha2::Sha256, mut bytes: &[u8]| {
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while bytes[0] == 0 {
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bytes = &bytes[1..];
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}
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// If the first high bit is set, pad it with a zero.
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let pad_zero = (bytes[0] & 0b10000000) > 1;
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add_hash(
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hash,
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&u32::to_be_bytes((bytes.len() + (pad_zero as usize)) as u32),
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);
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if pad_zero {
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add_hash(hash, &[0]);
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}
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add_hash(hash, bytes);
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};
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hash_string(
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&mut hash,
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&client_identification[..(client_identification.len() - 2)],
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); // V_C
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hash_string(
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&mut hash,
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&SERVER_IDENTIFICATION[..(SERVER_IDENTIFICATION.len() - 2)],
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); // V_S
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hash_string(&mut hash, client_kexinit); // I_C
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hash_string(&mut hash, server_kexinit); // I_S
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add_hash(&mut hash, &pub_hostkey.to_bytes()); // K_S
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// While the RFC says that e and f are mpints, we need to *NOT* treat them as mpints here.
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// Neither RFC4253 nor RFC8709 mention this.
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hash_string(&mut hash, &client_public_key.0); // e
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hash_string(&mut hash, server_public_key.as_bytes()); // f
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hash_mpint(&mut hash, shared_secret.as_bytes()); // K
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let hash = hash.finalize();
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let host_priv_key = ed25519_dalek::SigningKey::from_bytes(PRIVKEY_BYTES);
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assert_eq!(PUB_HOSTKEY_BYTES, host_priv_key.verifying_key().as_bytes());
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let signature = host_priv_key.sign(&hash);
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// eprintln!("client_public_key: {:x?}", client_public_key.0);
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// eprintln!("server_public_key: {:x?}", server_public_key.as_bytes());
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// eprintln!("shared_secret: {:x?}", shared_secret.as_bytes());
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// eprintln!("hash: {:x?}", hash);
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let packet = DhKeyExchangeInitReplyPacket {
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pubkey: pub_hostkey,
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f: MpInt(server_public_key.as_bytes()),
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signature: SshSignature {
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format: b"ssh-ed25519",
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data: &signature.to_bytes(),
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},
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};
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self.queue_msg(MsgKind::Packet(Packet {
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payload: packet.to_bytes(),
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}));
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self.state = ServerState::NewKeys;
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// TODO: set keys for transport
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}
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ServerState::NewKeys => {
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if packet.payload != &[Packet::SSH_MSG_NEWKEYS] {
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return Err(client_error!("did not send SSH_MSG_NEWKEYS"));
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}
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self.queue_msg(MsgKind::Packet(Packet {
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payload: vec![Packet::SSH_MSG_NEWKEYS],
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}));
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self.state = ServerState::ServiceRequest {};
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}
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ServerState::ServiceRequest {} => {}
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}
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}
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Ok(())
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}
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pub fn next_message_to_send(&mut self) -> Option<Msg> {
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self.send_queue.pop()
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}
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fn queue_msg(&mut self, msg: MsgKind) {
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self.send_queue.push(Msg(msg));
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}
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}
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#[derive(Debug)]
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pub struct Msg(MsgKind);
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#[derive(Debug, PartialEq)]
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enum MsgKind {
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ServerProtocolInfo,
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Packet(Packet),
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}
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impl Msg {
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// TODO: MAKE THIS ZERO ALLOC AAAAAA
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pub fn to_bytes(self) -> Vec<u8> {
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match self.0 {
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MsgKind::ServerProtocolInfo => SERVER_IDENTIFICATION.to_vec(),
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MsgKind::Packet(v) => v.to_bytes(),
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}
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}
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}
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// hardcoded test keys. lol.
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const _PUBKEY: &str =
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"ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOk5zfpvwNc3MztTTpE90zLI1Ref4AwwRVdSFyJLGbj2 testkey";
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/// Manually extracted, even worse, <https://superuser.com/questions/1477472/openssh-public-key-file-format>, help
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const PUB_HOSTKEY_BYTES: &[u8; 32] = &[
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0xe9, 0x39, 0xcd, 0xfa, 0x6f, 0xc0, 0xd7, 0x37, 0x33, 0x3b, 0x53, 0x4e, 0x91, 0x3d, 0xd3, 0x32,
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0xc8, 0xd5, 0x17, 0x9f, 0xe0, 0x0c, 0x30, 0x45, 0x57, 0x52, 0x17, 0x22, 0x4b, 0x19, 0xb8, 0xf6,
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];
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const _PRIVKEY: &str = "-----BEGIN OPENSSH PRIVATE KEY-----
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b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
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QyNTUxOQAAACDpOc36b8DXNzM7U06RPdMyyNUXn+AMMEVXUhciSxm49gAAAJDpgLSk6YC0
|
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pAAAAAtzc2gtZWQyNTUxOQAAACDpOc36b8DXNzM7U06RPdMyyNUXn+AMMEVXUhciSxm49g
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AAAECSeskxuEtJrr9L7ZkbpogXC5pKRNVHx1ueMX2h1XUnmek5zfpvwNc3MztTTpE90zLI
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1Ref4AwwRVdSFyJLGbj2AAAAB3Rlc3RrZXkBAgMEBQY=
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-----END OPENSSH PRIVATE KEY-----
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";
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/// Manually extracted from the key using <https://peterlyons.com/problog/2017/12/openssh-ed25519-private-key-file-format/>, probably wrong
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const PRIVKEY_BYTES: &[u8; 32] = &[
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0x92, 0x7a, 0xc9, 0x31, 0xb8, 0x4b, 0x49, 0xae, 0xbf, 0x4b, 0xed, 0x99, 0x1b, 0xa6, 0x88, 0x17,
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0x0b, 0x9a, 0x4a, 0x44, 0xd5, 0x47, 0xc7, 0x5b, 0x9e, 0x31, 0x7d, 0xa1, 0xd5, 0x75, 0x27, 0x99,
|
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];
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|
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macro_rules! client_error {
|
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($($tt:tt)*) => {
|
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$crate::SshError::ClientError(::std::format!($($tt)*))
|
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};
|
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}
|
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use client_error;
|
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|
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#[cfg(test)]
|
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mod tests {
|
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use hex_literal::hex;
|
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|
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use crate::{MsgKind, ServerConnection, SshRng};
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|
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struct NoRng;
|
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impl SshRng for NoRng {
|
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fn fill_bytes(&mut self, _: &mut [u8]) {
|
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unreachable!()
|
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}
|
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}
|
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|
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struct HardcodedRng(Vec<u8>);
|
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impl SshRng for HardcodedRng {
|
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fn fill_bytes(&mut self, dest: &mut [u8]) {
|
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dest.copy_from_slice(&self.0[..dest.len()]);
|
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self.0.splice(0..dest.len(), []);
|
||||
}
|
||||
}
|
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|
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#[test]
|
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fn protocol_exchange() {
|
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let mut con = ServerConnection::new(NoRng);
|
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con.recv_bytes(b"SSH-2.0-OpenSSH_9.7\r\n").unwrap();
|
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let msg = con.next_message_to_send().unwrap();
|
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assert_eq!(msg.0, MsgKind::ServerProtocolInfo);
|
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}
|
||||
|
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#[test]
|
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fn protocol_exchange_slow_client() {
|
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let mut con = ServerConnection::new(NoRng);
|
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con.recv_bytes(b"SSH-2.0-").unwrap();
|
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con.recv_bytes(b"OpenSSH_9.7\r\n").unwrap();
|
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let msg = con.next_message_to_send().unwrap();
|
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assert_eq!(msg.0, MsgKind::ServerProtocolInfo);
|
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}
|
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|
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#[test]
|
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fn handshake() {
|
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#[rustfmt::skip]
|
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let rng = vec![
|
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0x14, 0xa2, 0x04, 0xa5, 0x4b, 0x2f, 0x5f, 0xa7, 0xff, 0x53, 0x13, 0x67, 0x57, 0x67, 0xbc, 0x55,
|
||||
0x3f, 0xc0, 0x6c, 0x0d, 0x07, 0x8f, 0xe2, 0x75, 0x95, 0x18, 0x4b, 0xd2, 0xcb, 0xd0, 0x64, 0x06,
|
||||
];
|
||||
|
||||
struct Part {
|
||||
client: &'static [u8],
|
||||
server: &'static [u8],
|
||||
}
|
||||
|
||||
// Extracted from a real OpenSSH client using this server (with hardcoded creds) using Wireshark.
|
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let conversation = [
|
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Part {
|
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client: &hex!("5353482d322e302d4f70656e5353485f392e370d0a"),
|
||||
server: &hex!("5353482d322e302d4f70656e5353485f392e370d0a"),
|
||||
},
|
||||
// KEX Init
|
||||
Part {
|
||||
client: &hex!(
|
||||
"
|
||||
000005fc071401af35150e67f2bc6dc4bc6b5330901900000131736e74727570373631783235353
|
||||
1392d736861353132406f70656e7373682e636f6d2c637572766532353531392d7368613235362c
|
||||
637572766532353531392d736861323536406c69627373682e6f72672c656364682d736861322d6
|
||||
e697374703235362c656364682d736861322d6e697374703338342c656364682d736861322d6e69
|
||||
7374703532312c6469666669652d68656c6c6d616e2d67726f75702d65786368616e67652d73686
|
||||
13235362c6469666669652d68656c6c6d616e2d67726f757031362d7368613531322c6469666669
|
||||
652d68656c6c6d616e2d67726f757031382d7368613531322c6469666669652d68656c6c6d616e2
|
||||
d67726f757031342d7368613235362c6578742d696e666f2d632c6b65782d7374726963742d632d
|
||||
763030406f70656e7373682e636f6d000001cf7373682d656432353531392d636572742d7630314
|
||||
06f70656e7373682e636f6d2c65636473612d736861322d6e697374703235362d636572742d7630
|
||||
31406f70656e7373682e636f6d2c65636473612d736861322d6e697374703338342d636572742d7
|
||||
63031406f70656e7373682e636f6d2c65636473612d736861322d6e697374703532312d63657274
|
||||
2d763031406f70656e7373682e636f6d2c736b2d7373682d656432353531392d636572742d76303
|
||||
1406f70656e7373682e636f6d2c736b2d65636473612d736861322d6e697374703235362d636572
|
||||
742d763031406f70656e7373682e636f6d2c7273612d736861322d3531322d636572742d7630314
|
||||
06f70656e7373682e636f6d2c7273612d736861322d3235362d636572742d763031406f70656e73
|
||||
73682e636f6d2c7373682d656432353531392c65636473612d736861322d6e697374703235362c6
|
||||
5636473612d736861322d6e697374703338342c65636473612d736861322d6e697374703532312c
|
||||
736b2d7373682d65643235353139406f70656e7373682e636f6d2c736b2d65636473612d7368613
|
||||
22d6e69737470323536406f70656e7373682e636f6d2c7273612d736861322d3531322c7273612d
|
||||
736861322d3235360000006c63686163686132302d706f6c7931333035406f70656e7373682e636
|
||||
f6d2c6165733132382d6374722c6165733139322d6374722c6165733235362d6374722c61657331
|
||||
32382d67636d406f70656e7373682e636f6d2c6165733235362d67636d406f70656e7373682e636
|
||||
f6d0000006c63686163686132302d706f6c7931333035406f70656e7373682e636f6d2c61657331
|
||||
32382d6374722c6165733139322d6374722c6165733235362d6374722c6165733132382d67636d4
|
||||
06f70656e7373682e636f6d2c6165733235362d67636d406f70656e7373682e636f6d000000d575
|
||||
6d61632d36342d65746d406f70656e7373682e636f6d2c756d61632d3132382d65746d406f70656
|
||||
e7373682e636f6d2c686d61632d736861322d3235362d65746d406f70656e7373682e636f6d2c68
|
||||
6d61632d736861322d3531322d65746d406f70656e7373682e636f6d2c686d61632d736861312d6
|
||||
5746d406f70656e7373682e636f6d2c756d61632d3634406f70656e7373682e636f6d2c756d6163
|
||||
2d313238406f70656e7373682e636f6d2c686d61632d736861322d3235362c686d61632d7368613
|
||||
22d3531322c686d61632d73686131000000d5756d61632d36342d65746d406f70656e7373682e63
|
||||
6f6d2c756d61632d3132382d65746d406f70656e7373682e636f6d2c686d61632d736861322d323
|
||||
5362d65746d406f70656e7373682e636f6d2c686d61632d736861322d3531322d65746d406f7065
|
||||
6e7373682e636f6d2c686d61632d736861312d65746d406f70656e7373682e636f6d2c756d61632
|
||||
d3634406f70656e7373682e636f6d2c756d61632d313238406f70656e7373682e636f6d2c686d61
|
||||
632d736861322d3235362c686d61632d736861322d3531322c686d61632d736861310000001a6e6
|
||||
f6e652c7a6c6962406f70656e7373682e636f6d2c7a6c69620000001a6e6f6e652c7a6c6962406f
|
||||
70656e7373682e636f6d2c7a6c69620000000000000000000000000000000000000000
|
||||
"
|
||||
),
|
||||
server: &hex!(
|
||||
"
|
||||
000000c40d140000000000000000000000000000000000000011637572766532353531392d73686
|
||||
13235360000000b7373682d656432353531390000001d63686163686132302d706f6c7931333035
|
||||
406f70656e7373682e636f6d0000001d63686163686132302d706f6c7931333035406f70656e737
|
||||
3682e636f6d0000000d686d61632d736861322d3235360000000d686d61632d736861322d323536
|
||||
000000046e6f6e65000000046e6f6e6500000000000000000000000000000000000000000000000
|
||||
00000
|
||||
"
|
||||
),
|
||||
},
|
||||
// ECDH KEX Init
|
||||
Part {
|
||||
client: &hex!(
|
||||
"
|
||||
0000002c061e0000002086ac62fd02ac3333e2470f6024d0027696b29056f281f6fde0c05956fcf
|
||||
d3a53000000000000
|
||||
"
|
||||
),
|
||||
server: &hex!(
|
||||
"
|
||||
000000bc081f000000330000000b7373682d6564323535313900000020e939cdfa6fc0d737333b5
|
||||
34e913dd332c8d5179fe00c3045575217224b19b8f6000000203b92eb7008cc13056bc9f198049f
|
||||
75d5832f3650969dfcccd80841431b350160000000530000000b7373682d6564323535313900000
|
||||
04096ba808246f3b76270475d495330bfe174043609e81be35eadcabc0537ddcf8c4502831e9fef
|
||||
f2ef0e49cbe93e1747c01e2c9a6d19839648694defeb2adc77060000000000000000
|
||||
"
|
||||
),
|
||||
},
|
||||
// New Keys
|
||||
Part {
|
||||
client: &hex!("0000000c0a1500000000000000000000"),
|
||||
server: &hex!("0000000c0a1500000000000000000000"),
|
||||
},
|
||||
];
|
||||
|
||||
let mut con = ServerConnection::new(HardcodedRng(rng));
|
||||
for part in conversation {
|
||||
con.recv_bytes(&part.client).unwrap();
|
||||
let bytes = con.next_message_to_send().unwrap().to_bytes();
|
||||
assert_eq!(part.server, bytes);
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue