mirror of
https://github.com/Noratrieb/cluelessh.git
synced 2026-01-14 16:35:06 +01:00
515 lines
24 KiB
Rust
515 lines
24 KiB
Rust
use std::{collections::VecDeque, mem::take};
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use crate::crypto::{
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self, AlgorithmName, EncryptionAlgorithm, HostKeySigningAlgorithm, SupportedAlgorithms,
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};
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use crate::packet::{
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KeyExchangeEcDhInitPacket, KeyExchangeInitPacket, Packet, PacketTransport, ProtocolIdentParser,
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};
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use crate::Result;
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use crate::{peer_error, Msg, SshRng, SshStatus};
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use cluelessh_format::numbers;
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use cluelessh_format::{NameList, Reader, Writer};
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use cluelessh_keys::public::PublicKey;
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use cluelessh_keys::signature::Signature;
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use tracing::{debug, info, trace};
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// This is definitely who we are.
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// TODO: dont make cluelesshd do this
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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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rng: Box<dyn SshRng + Send + Sync>,
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config: ServerConfig,
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plaintext_packets: VecDeque<Packet>,
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}
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#[derive(Debug, Clone, Default)]
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pub struct ServerConfig {
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pub host_keys: Vec<cluelessh_keys::public::PublicKey>,
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}
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enum ServerState {
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ProtoExchange {
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ident_parser: ProtocolIdentParser,
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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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kex_algorithm: crypto::KexAlgorithm,
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server_host_key_algorithm: HostKeySigningAlgorithm,
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encryption_client_to_server: EncryptionAlgorithm,
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encryption_server_to_client: EncryptionAlgorithm,
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},
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WaitingForSignature {
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/// h
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hash: [u8; 32],
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pub_hostkey: PublicKey,
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/// k
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shared_secret: Vec<u8>,
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server_ephemeral_public_key: Vec<u8>,
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encryption_client_to_server: EncryptionAlgorithm,
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encryption_server_to_client: EncryptionAlgorithm,
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},
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NewKeys {
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/// h
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hash: [u8; 32],
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/// k
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shared_secret: Vec<u8>,
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encryption_client_to_server: EncryptionAlgorithm,
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encryption_server_to_client: EncryptionAlgorithm,
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},
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ServiceRequest {
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session_ident: [u8; 32],
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},
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Open {
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session_ident: [u8; 32],
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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, config: ServerConfig) -> Self {
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Self {
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state: ServerState::ProtoExchange {
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ident_parser: ProtocolIdentParser::new(),
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},
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packet_transport: PacketTransport::new(),
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rng: Box::new(rng),
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config,
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plaintext_packets: VecDeque::new(),
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}
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}
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pub fn recv_bytes(&mut self, bytes: &[u8]) -> Result<()> {
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if let ServerState::ProtoExchange { ident_parser } = &mut self.state {
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ident_parser.recv_bytes(bytes);
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if let Some(client_identification) = ident_parser.get_peer_ident() {
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self.packet_transport
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.queue_send_protocol_info(SERVER_IDENTIFICATION.to_vec());
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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.recv_next_packet() {
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let packet_type = packet.payload.first().unwrap_or(&0xFF);
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let packet_type_string = numbers::packet_type_to_string(*packet_type);
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trace!(%packet_type, %packet_type_string, packet_len = %packet.payload.len(), "Received packet");
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// Handle some packets ignoring the state.
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match packet.payload.first().copied() {
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Some(numbers::SSH_MSG_DISCONNECT) => {
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// <https://datatracker.ietf.org/doc/html/rfc4253#section-11.1>
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let mut disconnect = Reader::new(&packet.payload[1..]);
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let reason = disconnect.u32()?;
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let description = disconnect.utf8_string()?;
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let _language_tag = disconnect.utf8_string()?;
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let reason_string = numbers::disconnect_reason_to_string(reason);
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debug!(%reason, %reason_string, %description, "Client disconnecting");
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return Err(SshStatus::Disconnect);
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}
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Some(numbers::SSH_MSG_IGNORE) => {
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// <https://datatracker.ietf.org/doc/html/rfc4253#section-11.2>
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let mut p = Reader::new(&packet.payload[1..]);
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let _ = p.string()?;
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continue;
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}
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Some(numbers::SSH_MSG_DEBUG) => {
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// <https://datatracker.ietf.org/doc/html/rfc4253#section-11.3>
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let mut p = Reader::new(&packet.payload[1..]);
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let always_display = p.bool()?;
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let msg = p.utf8_string()?;
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let _language_tag = p.utf8_string()?;
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if always_display {
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info!(%msg, "Received debug message (SSH_MSG_DEBUG)");
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} else {
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debug!(%msg, "Received debug message (SSH_MSG_DEBUG)")
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}
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continue;
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}
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_ => {}
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}
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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 sup_algs = SupportedAlgorithms::secure(&self.config.host_keys);
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let kex_algorithm = sup_algs.key_exchange.find(false, kex.kex_algorithms.0)?;
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debug!(name = %kex_algorithm.name(), "Using KEX algorithm");
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let server_host_key_algorithm = sup_algs
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.hostkey_sign
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.find(false, kex.server_host_key_algorithms.0)?;
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debug!(name = %server_host_key_algorithm.name(), "Using host key algorithm");
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// TODO: Implement aes128-ctr
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let _ = crypto::encrypt::ENC_AES128_CTR;
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let encryption_client_to_server = sup_algs
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.encryption_from_peer
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.find(false, kex.encryption_algorithms_client_to_server.0)?;
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debug!(name = %encryption_client_to_server.name(), "Using encryption algorithm C->S");
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let encryption_server_to_client = sup_algs
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.encryption_to_peer
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.find(false, kex.encryption_algorithms_server_to_client.0)?;
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debug!(name = %encryption_server_to_client.name(), "Using encryption algorithm S->C");
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let mac_algorithm_client_to_server = sup_algs
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.mac_from_peer
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.find(false, kex.mac_algorithms_client_to_server.0)?;
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let mac_algorithm_server_to_client = sup_algs
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.mac_to_peer
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.find(false, kex.mac_algorithms_server_to_client.0)?;
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let compression_algorithm_client_to_server = sup_algs
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.compression_from_peer
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.find(false, kex.compression_algorithms_client_to_server.0)?;
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let compression_algorithm_server_to_client = sup_algs
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.compression_to_peer
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.find(false, kex.compression_algorithms_server_to_client.0)?;
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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(peer_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 mut cookie = [0; 16];
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self.rng.fill_bytes(&mut cookie);
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let server_kexinit = KeyExchangeInitPacket {
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cookie,
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kex_algorithms: NameList::one(kex_algorithm.name()),
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server_host_key_algorithms: NameList::one(server_host_key_algorithm.name()),
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encryption_algorithms_client_to_server: NameList::one(
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encryption_client_to_server.name(),
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),
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encryption_algorithms_server_to_client: NameList::one(
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encryption_server_to_client.name(),
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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.packet_transport.queue_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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kex_algorithm,
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server_host_key_algorithm,
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encryption_client_to_server,
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encryption_server_to_client,
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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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kex_algorithm,
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server_host_key_algorithm,
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encryption_client_to_server,
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encryption_server_to_client,
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} => {
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let dh = KeyExchangeEcDhInitPacket::parse(&packet.payload)?;
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let client_ephemeral_public_key = dh.qc;
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let server_secret = (kex_algorithm.generate_secret)(&mut *self.rng);
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let server_ephemeral_public_key = server_secret.pubkey;
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let shared_secret = (server_secret.exchange)(client_ephemeral_public_key)?;
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let pub_hostkey = server_host_key_algorithm.public_key();
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let hash = crypto::key_exchange_hash(
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client_identification,
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SERVER_IDENTIFICATION,
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client_kexinit,
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server_kexinit,
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&pub_hostkey.to_wire_encoding(),
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client_ephemeral_public_key,
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&server_ephemeral_public_key,
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&shared_secret,
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);
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// eprintln!("client_ephemeral_public_key: {:x?}", client_ephemeral_public_key);
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// eprintln!("server_ephemeral_public_key: {:x?}", server_ephemeral_public_key);
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// eprintln!("shared_secret: {:x?}", shared_secret);
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// eprintln!("hash: {:x?}", hash);
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self.state = ServerState::WaitingForSignature {
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hash,
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pub_hostkey,
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shared_secret,
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server_ephemeral_public_key,
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encryption_client_to_server: *encryption_client_to_server,
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encryption_server_to_client: *encryption_server_to_client,
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};
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}
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ServerState::WaitingForSignature { .. } => {
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return Err(peer_error!("unexpected packet"));
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}
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ServerState::NewKeys {
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hash: h,
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shared_secret: k,
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encryption_client_to_server,
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encryption_server_to_client,
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} => {
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if packet.payload != [numbers::SSH_MSG_NEWKEYS] {
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return Err(peer_error!("did not send SSH_MSG_NEWKEYS"));
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}
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self.packet_transport.queue_packet(Packet {
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payload: vec![numbers::SSH_MSG_NEWKEYS],
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});
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self.packet_transport.set_key(
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*h,
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k,
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*encryption_client_to_server,
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*encryption_server_to_client,
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true,
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);
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self.state = ServerState::ServiceRequest { session_ident: *h };
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}
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ServerState::ServiceRequest { session_ident } => {
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// TODO: this should probably move out of here? unsure.
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if packet.payload.first() != Some(&numbers::SSH_MSG_SERVICE_REQUEST) {
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return Err(peer_error!("did not send SSH_MSG_SERVICE_REQUEST"));
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}
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let mut p = Reader::new(&packet.payload[1..]);
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let service = p.utf8_string()?;
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debug!(%service, "Client requesting service");
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if service != "ssh-userauth" {
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return Err(peer_error!("only supports ssh-userauth"));
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}
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self.packet_transport.queue_packet(Packet {
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payload: {
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let mut writer = Writer::new();
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writer.u8(numbers::SSH_MSG_SERVICE_ACCEPT);
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writer.string(service.as_bytes());
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writer.finish()
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},
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});
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self.state = ServerState::Open {
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session_ident: *session_ident,
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};
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}
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ServerState::Open { .. } => {
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self.plaintext_packets.push_back(packet);
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}
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}
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}
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Ok(())
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}
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pub fn is_open(&self) -> Option<[u8; 32]> {
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match self.state {
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ServerState::Open { session_ident } => Some(session_ident),
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_ => None,
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}
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}
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pub fn is_waiting_on_signature(&self) -> Option<(&PublicKey, [u8; 32])> {
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match &self.state {
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ServerState::WaitingForSignature {
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pub_hostkey, hash, ..
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} => Some((pub_hostkey, *hash)),
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_ => None,
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}
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}
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pub fn do_signature(&mut self, signature: Signature) {
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match &self.state {
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ServerState::WaitingForSignature {
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hash,
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pub_hostkey,
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shared_secret,
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server_ephemeral_public_key,
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encryption_client_to_server,
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encryption_server_to_client,
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} => {
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let packet = Packet::new_msg_kex_ecdh_reply(
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&pub_hostkey.to_wire_encoding(),
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&server_ephemeral_public_key,
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&signature.to_wire_encoding(),
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);
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self.packet_transport.queue_packet(packet);
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self.state = ServerState::NewKeys {
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hash: *hash,
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shared_secret: shared_secret.clone(),
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encryption_client_to_server: *encryption_client_to_server,
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encryption_server_to_client: *encryption_server_to_client,
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};
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}
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_ => unreachable!("doing signature while not waiting for it"),
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}
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}
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pub fn next_msg_to_send(&mut self) -> Option<Msg> {
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self.packet_transport.next_msg_to_send()
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}
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pub fn next_plaintext_packet(&mut self) -> Option<Packet> {
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self.plaintext_packets.pop_front()
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}
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pub fn send_plaintext_packet(&mut self, packet: Packet) {
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self.packet_transport.queue_packet(packet);
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}
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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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use crate::{
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packet::MsgKind,
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server::{ServerConfig, ServerConnection},
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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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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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}
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#[test]
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fn protocol_exchange() {
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let mut con = ServerConnection::new(NoRng, ServerConfig::default());
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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_msg_to_send().unwrap();
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assert!(matches!(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, ServerConfig::default());
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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_msg_to_send().unwrap();
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assert!(matches!(msg.0, MsgKind::ServerProtocolInfo(_)));
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}
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#[test]
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#[ignore = "this is super annoying, use expect-test please"]
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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,
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0x55, 0x3f, 0xc0, 0x6c, 0x0d, 0x07, 0x8f, 0xe2, 0x75, 0x95, 0x18, 0x4b, 0xd2, 0xcb, 0xd0,
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0x64, 0x06, 0x14, 0xa2, 0x04, 0xa5, 0x4b, 0x2f, 0x5f, 0xa7, 0xff, 0x53, 0x13, 0x67, 0x57,
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0x67, 0xbc, 0x55, 0x3f, 0xc0, 0x6c, 0x0d, 0x07, 0x8f, 0xe2, 0x75, 0x95, 0x18, 0x4b, 0xd2,
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0xcb, 0xd0, 0x64, 0x06, 0x67, 0xbc, 0x55, 0x3f, 0xc0, 0x6c, 0x0d, 0x07, 0x8f, 0xe2, 0x75,
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0x95, 0x18, 0x4b, 0xd2, 0xcb, 0xd0, 0x64, 0x06,
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];
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struct Part {
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client: &'static [u8],
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server: &'static [u8],
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}
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// 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"),
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server: &hex!("5353482d322e302d4f70656e5353485f392e370d0a"),
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},
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// KEX Init
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Part {
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client: &hex!(
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"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"
|
|
),
|
|
server: &hex!(
|
|
"000000bc051414a204a54b2f5fa7ff5313675767bc5500000011637572766532353531392d7368613235360000000b7373682d656432353531390000001d63686163686132302d706f6c7931333035406f70656e7373682e636f6d0000001d63686163686132302d706f6c7931333035406f70656e7373682e636f6d0000000d686d61632d736861322d3235360000000d686d61632d736861322d323536000000046e6f6e65000000046e6f6e65000000000000000000000000000000000000"
|
|
),
|
|
},
|
|
// ECDH KEX Init
|
|
Part {
|
|
client: &hex!(
|
|
"0000002c061e000000204c646d1281abf23264d63db96e05c0223cfead668d9d38c62579b8856e67ae19000000000000"
|
|
),
|
|
server: &hex!(
|
|
"000000bc081f000000330000000b7373682d6564323535313900000020e939cdfa6fc0d737333b534e913dd332c8d5179fe00c3045575217224b19b8f6000000204260e2c5e5383f1a021c9631fa61f60f305b29183fd219d4c8207c664e063410000000530000000b7373682d65643235353139000000406504a045499f26aa4ee17606ea6bd9e3f288838591f25d8604a63f77a52f5b9e909c00d10f386553e585d86ab329bbde0fca5c64b1b1982d7adcac17cf7f06010000000000000000"
|
|
),
|
|
},
|
|
// New Keys
|
|
Part {
|
|
client: &hex!("0000000c0a1500000000000000000000"),
|
|
server: &hex!("0000000c0a1500000000000000000000"),
|
|
},
|
|
// Service Request (encrypted)
|
|
Part {
|
|
client: &hex!("09ca4db7baeb24836a1f7d22368055bf4c26981ed86738ac7a5c31d0730ad656f1967853781dff91ee1c4de8"),
|
|
server: &hex!("7b444c0d5faf740d350701a054ea469fab1c98e4b669e4872a454163edb42ec5e4fa95c404ab601f016bd259"),
|
|
},
|
|
];
|
|
|
|
let mut con = ServerConnection::new(HardcodedRng(rng), ServerConfig::default());
|
|
for part in conversation {
|
|
con.recv_bytes(&part.client).unwrap();
|
|
eprintln!("client: {:x?}", part.client);
|
|
let bytes = con.next_msg_to_send().unwrap().to_bytes();
|
|
if part.server != bytes {
|
|
panic!(
|
|
"expected != found\nexpected: {:x?}\nfound: {:x?}",
|
|
part.server, bytes
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|