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|
[[package]]
|
||||||
|
name = "tracing-attributes"
|
||||||
|
version = "0.1.27"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
|
||||||
|
dependencies = [
|
||||||
|
"proc-macro2",
|
||||||
|
"quote",
|
||||||
|
"syn",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tracing-core"
|
||||||
|
version = "0.1.32"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "c06d3da6113f116aaee68e4d601191614c9053067f9ab7f6edbcb161237daa54"
|
||||||
|
dependencies = [
|
||||||
|
"once_cell",
|
||||||
|
"valuable",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tracing-log"
|
||||||
|
version = "0.2.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ee855f1f400bd0e5c02d150ae5de3840039a3f54b025156404e34c23c03f47c3"
|
||||||
|
dependencies = [
|
||||||
|
"log",
|
||||||
|
"once_cell",
|
||||||
|
"tracing-core",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tracing-subscriber"
|
||||||
|
version = "0.3.18"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ad0f048c97dbd9faa9b7df56362b8ebcaa52adb06b498c050d2f4e32f90a7a8b"
|
||||||
|
dependencies = [
|
||||||
|
"matchers",
|
||||||
|
"nu-ansi-term",
|
||||||
|
"once_cell",
|
||||||
|
"regex",
|
||||||
|
"sharded-slab",
|
||||||
|
"smallvec",
|
||||||
|
"thread_local",
|
||||||
|
"tracing",
|
||||||
|
"tracing-core",
|
||||||
|
"tracing-log",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "typenum"
|
||||||
|
version = "1.17.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "unicode-ident"
|
||||||
|
version = "1.0.12"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "valuable"
|
||||||
|
version = "0.1.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "version_check"
|
||||||
|
version = "0.9.5"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "wasi"
|
||||||
|
version = "0.11.0+wasi-snapshot-preview1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi"
|
||||||
|
version = "0.3.9"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||||
|
dependencies = [
|
||||||
|
"winapi-i686-pc-windows-gnu",
|
||||||
|
"winapi-x86_64-pc-windows-gnu",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi-i686-pc-windows-gnu"
|
||||||
|
version = "0.4.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi-x86_64-pc-windows-gnu"
|
||||||
|
version = "0.4.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows-sys"
|
||||||
|
version = "0.52.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
|
||||||
|
dependencies = [
|
||||||
|
"windows-targets",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows-targets"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
|
||||||
|
dependencies = [
|
||||||
|
"windows_aarch64_gnullvm",
|
||||||
|
"windows_aarch64_msvc",
|
||||||
|
"windows_i686_gnu",
|
||||||
|
"windows_i686_gnullvm",
|
||||||
|
"windows_i686_msvc",
|
||||||
|
"windows_x86_64_gnu",
|
||||||
|
"windows_x86_64_gnullvm",
|
||||||
|
"windows_x86_64_msvc",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_aarch64_gnullvm"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_aarch64_msvc"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_i686_gnu"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_i686_gnullvm"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_i686_msvc"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_gnu"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_gnullvm"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "windows_x86_64_msvc"
|
||||||
|
version = "0.52.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "x25519-dalek"
|
||||||
|
version = "2.0.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "c7e468321c81fb07fa7f4c636c3972b9100f0346e5b6a9f2bd0603a52f7ed277"
|
||||||
|
dependencies = [
|
||||||
|
"curve25519-dalek",
|
||||||
|
"rand_core",
|
||||||
|
"serde",
|
||||||
|
"zeroize",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "zerocopy"
|
||||||
|
version = "0.7.35"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
|
||||||
|
dependencies = [
|
||||||
|
"byteorder",
|
||||||
|
"zerocopy-derive",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "zerocopy-derive"
|
||||||
|
version = "0.7.35"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
|
||||||
|
dependencies = [
|
||||||
|
"proc-macro2",
|
||||||
|
"quote",
|
||||||
|
"syn",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "zeroize"
|
||||||
|
version = "1.8.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde"
|
||||||
|
dependencies = [
|
||||||
|
"zeroize_derive",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "zeroize_derive"
|
||||||
|
version = "1.4.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
|
||||||
|
dependencies = [
|
||||||
|
"proc-macro2",
|
||||||
|
"quote",
|
||||||
|
"syn",
|
||||||
|
]
|
||||||
15
Cargo.toml
Normal file
15
Cargo.toml
Normal file
|
|
@ -0,0 +1,15 @@
|
||||||
|
[package]
|
||||||
|
name = "fakessh"
|
||||||
|
version = "0.1.0"
|
||||||
|
edition = "2021"
|
||||||
|
|
||||||
|
[dependencies]
|
||||||
|
crypto-bigint = "0.5.5"
|
||||||
|
ed25519-dalek = "2.1.1"
|
||||||
|
eyre = "0.6.12"
|
||||||
|
rand = "0.8.5"
|
||||||
|
sha2 = "0.10.8"
|
||||||
|
tokio = { version = "1.39.2", features = ["full"] }
|
||||||
|
tracing = "0.1.40"
|
||||||
|
tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
|
||||||
|
x25519-dalek = "2.0.1"
|
||||||
609
src/lib.rs
Normal file
609
src/lib.rs
Normal file
|
|
@ -0,0 +1,609 @@
|
||||||
|
mod parse;
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub enum SshError {
|
||||||
|
/// The client did something wrong.
|
||||||
|
/// The connection should be closed and a notice may be logged,
|
||||||
|
/// but this does not require operator intervention.
|
||||||
|
ClientError(String),
|
||||||
|
/// Something went wrong on the server.
|
||||||
|
/// The connection should be closed and an error should be logged.
|
||||||
|
ServerError(eyre::Report),
|
||||||
|
}
|
||||||
|
|
||||||
|
pub type Result<T, E = SshError> = std::result::Result<T, E>;
|
||||||
|
|
||||||
|
impl From<eyre::Report> for SshError {
|
||||||
|
fn from(value: eyre::Report) -> Self {
|
||||||
|
Self::ServerError(value)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
macro_rules! client_error {
|
||||||
|
($($tt:tt)*) => {
|
||||||
|
$crate::SshError::ClientError(::std::format!($($tt)*))
|
||||||
|
};
|
||||||
|
}
|
||||||
|
use std::mem::take;
|
||||||
|
|
||||||
|
use client_error;
|
||||||
|
use ed25519_dalek::ed25519::signature::SignerMut;
|
||||||
|
use parse::{MpInt, NameList, Parser, Writer};
|
||||||
|
use sha2::Digest;
|
||||||
|
use x25519_dalek::{EphemeralSecret, PublicKey};
|
||||||
|
|
||||||
|
// This is definitely who we are.
|
||||||
|
pub const SERVER_IDENTIFICATION: &[u8] = b"SSH-2.0-OpenSSH_9.7\r\n";
|
||||||
|
|
||||||
|
#[derive(Default)]
|
||||||
|
pub struct ServerConnection {
|
||||||
|
state: ServerState,
|
||||||
|
send_queue: Vec<Msg>,
|
||||||
|
}
|
||||||
|
|
||||||
|
enum ServerState {
|
||||||
|
ProtoExchange {
|
||||||
|
received: Vec<u8>,
|
||||||
|
},
|
||||||
|
KeyExchangeInit {
|
||||||
|
client_packet: PacketParser,
|
||||||
|
client_identification: Vec<u8>,
|
||||||
|
},
|
||||||
|
DhKeyInit {
|
||||||
|
client_packet: PacketParser,
|
||||||
|
client_identification: Vec<u8>,
|
||||||
|
client_kexinit: Vec<u8>,
|
||||||
|
server_kexinit: Vec<u8>,
|
||||||
|
},
|
||||||
|
ServiceRequest {},
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Default for ServerState {
|
||||||
|
fn default() -> Self {
|
||||||
|
Self::ProtoExchange {
|
||||||
|
received: Vec::new(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl ServerConnection {
|
||||||
|
pub fn recv_bytes(&mut self, mut bytes: &[u8]) -> Result<()> {
|
||||||
|
while let Some(consumed) = self.recv_bytes_step(bytes)? {
|
||||||
|
bytes = &bytes[consumed..];
|
||||||
|
if bytes.is_empty() {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
|
fn recv_bytes_step(&mut self, bytes: &[u8]) -> Result<Option<usize>> {
|
||||||
|
let result = match &mut self.state {
|
||||||
|
ServerState::ProtoExchange { received } => {
|
||||||
|
// TODO: get rid of this allocation :(
|
||||||
|
received.extend_from_slice(bytes);
|
||||||
|
if received.windows(2).find(|win| win == b"\r\n").is_some() {
|
||||||
|
// TODO: care that its SSH 2.0 instead of anythin anything else
|
||||||
|
// The client will not send any more information than this until we respond, so discord the rest of the bytes.
|
||||||
|
let client_identification = received.to_owned();
|
||||||
|
self.queue_msg(MsgKind::ServerProtocolInfo);
|
||||||
|
self.state = ServerState::KeyExchangeInit {
|
||||||
|
client_packet: PacketParser::new(),
|
||||||
|
client_identification,
|
||||||
|
};
|
||||||
|
}
|
||||||
|
None
|
||||||
|
}
|
||||||
|
ServerState::KeyExchangeInit {
|
||||||
|
client_packet: packet,
|
||||||
|
client_identification,
|
||||||
|
} => match packet.recv_bytes(bytes, ())? {
|
||||||
|
Some((consumed, data)) => {
|
||||||
|
let kex = KeyExchangeInitPacket::parse(&data.payload)?;
|
||||||
|
|
||||||
|
let require_algorithm =
|
||||||
|
|expected: &'static str, list: NameList<'_>| -> Result<&'static str> {
|
||||||
|
if list.iter().any(|alg| alg == expected) {
|
||||||
|
Ok(expected)
|
||||||
|
} else {
|
||||||
|
Err(client_error!(
|
||||||
|
"client does not supported algorithm {expected}"
|
||||||
|
))
|
||||||
|
}
|
||||||
|
};
|
||||||
|
|
||||||
|
let key_algorithm = require_algorithm("curve25519-sha256", kex.kex_algorithms)?;
|
||||||
|
let server_host_key_algorithm =
|
||||||
|
require_algorithm("ssh-ed25519", kex.server_host_key_algorithms)?;
|
||||||
|
let encryption_algorithm_client_to_server = require_algorithm(
|
||||||
|
"chacha20-poly1305@openssh.com",
|
||||||
|
kex.encryption_algorithms_client_to_server,
|
||||||
|
)?;
|
||||||
|
let encryption_algorithm_server_to_client = require_algorithm(
|
||||||
|
"chacha20-poly1305@openssh.com",
|
||||||
|
kex.encryption_algorithms_server_to_client,
|
||||||
|
)?;
|
||||||
|
let mac_algorithm_client_to_server =
|
||||||
|
require_algorithm("hmac-sha2-256", kex.mac_algorithms_client_to_server)?;
|
||||||
|
let mac_algorithm_server_to_client =
|
||||||
|
require_algorithm("hmac-sha2-256", kex.mac_algorithms_server_to_client)?;
|
||||||
|
let compression_algorithm_client_to_server =
|
||||||
|
require_algorithm("none", kex.compression_algorithms_client_to_server)?;
|
||||||
|
let compression_algorithm_server_to_client =
|
||||||
|
require_algorithm("none", kex.compression_algorithms_server_to_client)?;
|
||||||
|
|
||||||
|
let _ = kex.languages_client_to_server;
|
||||||
|
let _ = kex.languages_server_to_client;
|
||||||
|
|
||||||
|
if kex.first_kex_packet_follows {
|
||||||
|
return Err(client_error!(
|
||||||
|
"the client wants to send a guessed packet, that's annoying :("
|
||||||
|
));
|
||||||
|
}
|
||||||
|
|
||||||
|
let my_own_kex_init = KeyExchangeInitPacket {
|
||||||
|
cookie: [0; 16],
|
||||||
|
kex_algorithms: NameList::one(key_algorithm),
|
||||||
|
server_host_key_algorithms: NameList::one(server_host_key_algorithm),
|
||||||
|
encryption_algorithms_client_to_server: NameList::one(
|
||||||
|
encryption_algorithm_client_to_server,
|
||||||
|
),
|
||||||
|
encryption_algorithms_server_to_client: NameList::one(
|
||||||
|
encryption_algorithm_server_to_client,
|
||||||
|
),
|
||||||
|
mac_algorithms_client_to_server: NameList::one(
|
||||||
|
mac_algorithm_client_to_server,
|
||||||
|
),
|
||||||
|
mac_algorithms_server_to_client: NameList::one(
|
||||||
|
mac_algorithm_server_to_client,
|
||||||
|
),
|
||||||
|
compression_algorithms_client_to_server: NameList::one(
|
||||||
|
compression_algorithm_client_to_server,
|
||||||
|
),
|
||||||
|
compression_algorithms_server_to_client: NameList::one(
|
||||||
|
compression_algorithm_server_to_client,
|
||||||
|
),
|
||||||
|
languages_client_to_server: NameList::none(),
|
||||||
|
languages_server_to_client: NameList::none(),
|
||||||
|
first_kex_packet_follows: false,
|
||||||
|
};
|
||||||
|
|
||||||
|
let client_identification = take(client_identification);
|
||||||
|
let server_kexinit_payload = my_own_kex_init.to_bytes();
|
||||||
|
self.queue_msg(MsgKind::Packet(Packet {
|
||||||
|
payload: server_kexinit_payload.clone(),
|
||||||
|
}));
|
||||||
|
self.state = ServerState::DhKeyInit {
|
||||||
|
client_packet: PacketParser::new(),
|
||||||
|
client_identification,
|
||||||
|
client_kexinit: data.payload,
|
||||||
|
server_kexinit: server_kexinit_payload,
|
||||||
|
};
|
||||||
|
|
||||||
|
Some(consumed)
|
||||||
|
}
|
||||||
|
None => None,
|
||||||
|
},
|
||||||
|
ServerState::DhKeyInit {
|
||||||
|
client_packet: packet,
|
||||||
|
client_identification,
|
||||||
|
client_kexinit,
|
||||||
|
server_kexinit,
|
||||||
|
} => match packet.recv_bytes(bytes, ())? {
|
||||||
|
Some((consumed, data)) => {
|
||||||
|
let dh = DhKeyExchangeInitPacket::parse(&data.payload)?;
|
||||||
|
|
||||||
|
let secret = EphemeralSecret::random_from_rng(rand::thread_rng());
|
||||||
|
let server_public = PublicKey::from(&secret);
|
||||||
|
|
||||||
|
let shared_secret = secret.diffie_hellman(&dh.e.to_x25519_public_key()?);
|
||||||
|
|
||||||
|
let mut hash = sha2::Sha256::new();
|
||||||
|
let mut hash_string = |bytes: &[u8]| {
|
||||||
|
hash.update(u32::to_be_bytes(bytes.len() as u32));
|
||||||
|
hash.update(bytes);
|
||||||
|
};
|
||||||
|
hash_string(&client_identification[..(client_identification.len() - 2)]);
|
||||||
|
hash_string(&SERVER_IDENTIFICATION[..(SERVER_IDENTIFICATION.len() - 2)]);
|
||||||
|
hash_string(client_kexinit);
|
||||||
|
hash_string(server_kexinit);
|
||||||
|
let mut hash_mpint = hash_string;
|
||||||
|
hash_mpint(&dh.e.0);
|
||||||
|
hash_mpint(server_public.as_bytes());
|
||||||
|
hash_mpint(shared_secret.as_bytes());
|
||||||
|
|
||||||
|
let hash = hash.finalize();
|
||||||
|
|
||||||
|
let mut host_priv_key = ed25519_dalek::SigningKey::from_bytes(PRIVKEY_BYTES);
|
||||||
|
let signature = host_priv_key.sign(&hash);
|
||||||
|
|
||||||
|
let packet = DhKeyExchangeInitReplyPacket {
|
||||||
|
pubkey: SshPublicKey {
|
||||||
|
format: b"ssh-ed25519",
|
||||||
|
data: PUBKEY_BYTES,
|
||||||
|
},
|
||||||
|
f: MpInt(server_public.as_bytes()),
|
||||||
|
signature: SshSignature {
|
||||||
|
format: b"ssh-ed25519",
|
||||||
|
data: &signature.to_bytes(),
|
||||||
|
},
|
||||||
|
};
|
||||||
|
self.queue_msg(MsgKind::Packet(Packet {
|
||||||
|
payload: packet.to_bytes(),
|
||||||
|
}));
|
||||||
|
self.state = ServerState::ServiceRequest {};
|
||||||
|
|
||||||
|
Some(consumed)
|
||||||
|
}
|
||||||
|
None => None,
|
||||||
|
},
|
||||||
|
ServerState::ServiceRequest {} => todo!(),
|
||||||
|
};
|
||||||
|
Ok(result)
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn next_message_to_send(&mut self) -> Option<Msg> {
|
||||||
|
self.send_queue.pop()
|
||||||
|
}
|
||||||
|
|
||||||
|
fn queue_msg(&mut self, msg: MsgKind) {
|
||||||
|
self.send_queue.push(Msg(msg));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
pub struct Msg(MsgKind);
|
||||||
|
|
||||||
|
#[derive(Debug, PartialEq)]
|
||||||
|
enum MsgKind {
|
||||||
|
ServerProtocolInfo,
|
||||||
|
Packet(Packet),
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Msg {
|
||||||
|
// TODO: MAKE THIS ZERO ALLOC AAAAAA
|
||||||
|
pub fn to_bytes_inefficient(self) -> Vec<u8> {
|
||||||
|
match self.0 {
|
||||||
|
MsgKind::ServerProtocolInfo => SERVER_IDENTIFICATION.to_vec(),
|
||||||
|
MsgKind::Packet(v) => v.to_bytes(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, PartialEq)]
|
||||||
|
struct Packet {
|
||||||
|
payload: Vec<u8>,
|
||||||
|
}
|
||||||
|
impl Packet {
|
||||||
|
const SSH_MSG_KEXINIT: u8 = 20;
|
||||||
|
const SSH_MSG_KEXDH_INIT: u8 = 30;
|
||||||
|
const SSH_MSG_KEXDH_REPLY: u8 = 31;
|
||||||
|
|
||||||
|
fn from_raw(bytes: &[u8]) -> Result<Self> {
|
||||||
|
let Some(padding_length) = bytes.get(0) else {
|
||||||
|
return Err(client_error!("empty packet"));
|
||||||
|
};
|
||||||
|
// TODO: mac?
|
||||||
|
let Some(payload_len) = (bytes.len() - 1).checked_sub(*padding_length as usize) else {
|
||||||
|
return Err(client_error!("packet padding longer than packet"));
|
||||||
|
};
|
||||||
|
let payload = &bytes[1..][..payload_len];
|
||||||
|
|
||||||
|
if (bytes.len() + 4) % 8 != 0 {
|
||||||
|
return Err(client_error!("full packet length must be multiple of 8"));
|
||||||
|
}
|
||||||
|
|
||||||
|
Ok(Self {
|
||||||
|
payload: payload.to_vec(),
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
fn to_bytes(&self) -> Vec<u8> {
|
||||||
|
let mut new = Vec::new();
|
||||||
|
|
||||||
|
let min_full_length = self.payload.len() + 4 + 1;
|
||||||
|
|
||||||
|
// The padding must give a factor of 8.
|
||||||
|
let min_padding_len = (min_full_length.next_multiple_of(8) - min_full_length) as u8;
|
||||||
|
// > There MUST be at least four bytes of padding.
|
||||||
|
// So let's satisfy this by just adding 8. We can always properly randomize it later if desired.
|
||||||
|
let padding_len = min_padding_len + 8;
|
||||||
|
|
||||||
|
let packet_len = self.payload.len() + (padding_len as usize) + 1;
|
||||||
|
new.extend_from_slice(&u32::to_be_bytes(packet_len as u32));
|
||||||
|
new.extend_from_slice(&[padding_len]);
|
||||||
|
new.extend_from_slice(&self.payload);
|
||||||
|
new.extend(std::iter::repeat(0).take(padding_len as usize));
|
||||||
|
// mac...
|
||||||
|
|
||||||
|
assert!((4 + 1 + self.payload.len() + (padding_len as usize)) % 8 == 0);
|
||||||
|
assert!(new.len() % 8 == 0);
|
||||||
|
|
||||||
|
new
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
struct KeyExchangeInitPacket<'a> {
|
||||||
|
cookie: [u8; 16],
|
||||||
|
kex_algorithms: NameList<'a>,
|
||||||
|
server_host_key_algorithms: NameList<'a>,
|
||||||
|
encryption_algorithms_client_to_server: NameList<'a>,
|
||||||
|
encryption_algorithms_server_to_client: NameList<'a>,
|
||||||
|
mac_algorithms_client_to_server: NameList<'a>,
|
||||||
|
mac_algorithms_server_to_client: NameList<'a>,
|
||||||
|
compression_algorithms_client_to_server: NameList<'a>,
|
||||||
|
compression_algorithms_server_to_client: NameList<'a>,
|
||||||
|
languages_client_to_server: NameList<'a>,
|
||||||
|
languages_server_to_client: NameList<'a>,
|
||||||
|
first_kex_packet_follows: bool,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl<'a> KeyExchangeInitPacket<'a> {
|
||||||
|
fn parse(payload: &'a [u8]) -> Result<KeyExchangeInitPacket<'_>> {
|
||||||
|
let mut c = Parser::new(payload);
|
||||||
|
|
||||||
|
let kind = c.u8()?;
|
||||||
|
if kind != Packet::SSH_MSG_KEXINIT {
|
||||||
|
return Err(client_error!(
|
||||||
|
"expected SSH_MSG_KEXINIT packet, found {kind}"
|
||||||
|
));
|
||||||
|
}
|
||||||
|
let cookie = c.read_array::<16>()?;
|
||||||
|
let kex_algorithms = c.name_list()?;
|
||||||
|
let server_host_key_algorithms = c.name_list()?;
|
||||||
|
let encryption_algorithms_client_to_server = c.name_list()?;
|
||||||
|
let encryption_algorithms_server_to_client = c.name_list()?;
|
||||||
|
let mac_algorithms_client_to_server = c.name_list()?;
|
||||||
|
let mac_algorithms_server_to_client = c.name_list()?;
|
||||||
|
let compression_algorithms_client_to_server = c.name_list()?;
|
||||||
|
let compression_algorithms_server_to_client = c.name_list()?;
|
||||||
|
|
||||||
|
let languages_client_to_server = c.name_list()?;
|
||||||
|
let languages_server_to_client = c.name_list()?;
|
||||||
|
|
||||||
|
let first_kex_packet_follows = c.bool()?;
|
||||||
|
|
||||||
|
let _ = c.u32()?; // Reserved.
|
||||||
|
|
||||||
|
Ok(Self {
|
||||||
|
cookie,
|
||||||
|
kex_algorithms,
|
||||||
|
server_host_key_algorithms,
|
||||||
|
encryption_algorithms_client_to_server,
|
||||||
|
encryption_algorithms_server_to_client,
|
||||||
|
mac_algorithms_client_to_server,
|
||||||
|
mac_algorithms_server_to_client,
|
||||||
|
compression_algorithms_client_to_server,
|
||||||
|
compression_algorithms_server_to_client,
|
||||||
|
languages_client_to_server,
|
||||||
|
languages_server_to_client,
|
||||||
|
first_kex_packet_follows,
|
||||||
|
})
|
||||||
|
}
|
||||||
|
|
||||||
|
fn to_bytes(&self) -> Vec<u8> {
|
||||||
|
let mut data = Writer::new();
|
||||||
|
|
||||||
|
data.u8(Packet::SSH_MSG_KEXINIT);
|
||||||
|
data.write(&self.cookie);
|
||||||
|
data.name_list(self.kex_algorithms);
|
||||||
|
data.name_list(self.server_host_key_algorithms);
|
||||||
|
data.name_list(self.encryption_algorithms_client_to_server);
|
||||||
|
data.name_list(self.encryption_algorithms_server_to_client);
|
||||||
|
data.name_list(self.mac_algorithms_client_to_server);
|
||||||
|
data.name_list(self.mac_algorithms_server_to_client);
|
||||||
|
data.name_list(self.compression_algorithms_client_to_server);
|
||||||
|
data.name_list(self.compression_algorithms_server_to_client);
|
||||||
|
data.name_list(self.languages_client_to_server);
|
||||||
|
data.name_list(self.languages_server_to_client);
|
||||||
|
data.u8(self.first_kex_packet_follows as u8);
|
||||||
|
data.u32(0); // Reserved.
|
||||||
|
|
||||||
|
data.finish()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
struct DhKeyExchangeInitPacket<'a> {
|
||||||
|
e: MpInt<'a>,
|
||||||
|
}
|
||||||
|
impl<'a> DhKeyExchangeInitPacket<'a> {
|
||||||
|
fn parse(payload: &'a [u8]) -> Result<DhKeyExchangeInitPacket<'_>> {
|
||||||
|
let mut c = Parser::new(payload);
|
||||||
|
|
||||||
|
let kind = c.u8()?;
|
||||||
|
if kind != Packet::SSH_MSG_KEXDH_INIT {
|
||||||
|
return Err(client_error!(
|
||||||
|
"expected SSH_MSG_KEXDH_INIT packet, found {kind}"
|
||||||
|
));
|
||||||
|
}
|
||||||
|
let e = c.mpint()?;
|
||||||
|
Ok(Self { e })
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
struct SshPublicKey<'a> {
|
||||||
|
format: &'a [u8],
|
||||||
|
data: &'a [u8],
|
||||||
|
}
|
||||||
|
#[derive(Debug)]
|
||||||
|
struct SshSignature<'a> {
|
||||||
|
format: &'a [u8],
|
||||||
|
data: &'a [u8],
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug)]
|
||||||
|
struct DhKeyExchangeInitReplyPacket<'a> {
|
||||||
|
pubkey: SshPublicKey<'a>,
|
||||||
|
f: MpInt<'a>,
|
||||||
|
signature: SshSignature<'a>,
|
||||||
|
}
|
||||||
|
impl<'a> DhKeyExchangeInitReplyPacket<'a> {
|
||||||
|
fn to_bytes(&self) -> Vec<u8> {
|
||||||
|
let mut data = Writer::new();
|
||||||
|
|
||||||
|
data.u8(Packet::SSH_MSG_KEXDH_REPLY);
|
||||||
|
data.u32((4 + self.pubkey.format.len() + 4 + self.pubkey.data.len()) as u32);
|
||||||
|
// ed25519-specific!
|
||||||
|
// <https://datatracker.ietf.org/doc/html/rfc8709#section-4>
|
||||||
|
data.string(&self.pubkey.format);
|
||||||
|
data.string(&self.pubkey.data);
|
||||||
|
data.mpint(self.f);
|
||||||
|
|
||||||
|
data.u32((4 + self.signature.format.len() + 4 + self.signature.data.len()) as u32);
|
||||||
|
// <https://datatracker.ietf.org/doc/html/rfc8709#section-6>
|
||||||
|
data.string(&self.signature.format);
|
||||||
|
data.string(&self.signature.data);
|
||||||
|
data.finish()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
struct PacketParser {
|
||||||
|
// The length of the packet.
|
||||||
|
packet_length: Option<usize>,
|
||||||
|
// Before we've read the length fully, this stores the length.
|
||||||
|
// Afterwards, this stores the packet data *after* the length.
|
||||||
|
data: Vec<u8>,
|
||||||
|
}
|
||||||
|
impl PacketParser {
|
||||||
|
fn new() -> Self {
|
||||||
|
Self {
|
||||||
|
packet_length: None,
|
||||||
|
data: Vec::new(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
fn recv_bytes(&mut self, bytes: &[u8], mac: ()) -> Result<Option<(usize, Packet)>> {
|
||||||
|
let Some((consumed, data)) = self.recv_bytes_inner(bytes, mac)? else {
|
||||||
|
return Ok(None);
|
||||||
|
};
|
||||||
|
Ok(Some((consumed, Packet::from_raw(&data)?)))
|
||||||
|
}
|
||||||
|
fn recv_bytes_inner(&mut self, mut bytes: &[u8], _mac: ()) -> Result<Option<(usize, Vec<u8>)>> {
|
||||||
|
let mut consumed = 0;
|
||||||
|
let packet_length = match self.packet_length {
|
||||||
|
Some(packet_length) => packet_length,
|
||||||
|
None => {
|
||||||
|
let remaining_len = std::cmp::min(bytes.len(), 4 - self.data.len());
|
||||||
|
// Try to read the bytes of the length.
|
||||||
|
self.data.extend_from_slice(&bytes[..remaining_len]);
|
||||||
|
if self.data.len() < 4 {
|
||||||
|
// Not enough data yet :(.
|
||||||
|
return Ok(None);
|
||||||
|
}
|
||||||
|
|
||||||
|
let packet_length = u32::from_be_bytes(self.data.as_slice().try_into().unwrap());
|
||||||
|
let packet_length = packet_length.try_into().unwrap();
|
||||||
|
self.data.clear();
|
||||||
|
|
||||||
|
self.packet_length = Some(packet_length);
|
||||||
|
|
||||||
|
// We have the data.
|
||||||
|
bytes = &bytes[remaining_len..];
|
||||||
|
consumed += remaining_len;
|
||||||
|
|
||||||
|
packet_length
|
||||||
|
}
|
||||||
|
};
|
||||||
|
|
||||||
|
let remaining_len = std::cmp::min(bytes.len(), packet_length - self.data.len());
|
||||||
|
self.data.extend_from_slice(&bytes[..remaining_len]);
|
||||||
|
consumed += remaining_len;
|
||||||
|
|
||||||
|
if self.data.len() == packet_length {
|
||||||
|
// We have the full data.
|
||||||
|
Ok(Some((consumed, std::mem::take(&mut self.data))))
|
||||||
|
} else {
|
||||||
|
Ok(None)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
#[cfg(test)]
|
||||||
|
fn test_recv_bytes(&mut self, bytes: &[u8], mac: ()) -> Option<(usize, Vec<u8>)> {
|
||||||
|
self.recv_bytes_inner(bytes, mac).unwrap()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// hardcoded test keys. lol.
|
||||||
|
const _PUBKEY: &str =
|
||||||
|
"ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOk5zfpvwNc3MztTTpE90zLI1Ref4AwwRVdSFyJLGbj2 testkey";
|
||||||
|
/// Manually extracted, even worse, <https://superuser.com/questions/1477472/openssh-public-key-file-format>, help
|
||||||
|
const PUBKEY_BYTES: &[u8; 32] = &[
|
||||||
|
0xe9, 0x39, 0xcd, 0xfa, 0x6f, 0xc0, 0xd7, 0x37, 0x33, 0x3b, 0x53, 0x4e, 0x91, 0x3d, 0xd3, 0x32,
|
||||||
|
0xc8, 0xd5, 0x17, 0x9f, 0xe0, 0x0c, 0x30, 0x45, 0x57, 0x52, 0x17, 0x22, 0x4b, 0x19, 0xb8, 0xf6,
|
||||||
|
];
|
||||||
|
const _PRIVKEY: &str = "-----BEGIN OPENSSH PRIVATE KEY-----
|
||||||
|
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
|
||||||
|
QyNTUxOQAAACDpOc36b8DXNzM7U06RPdMyyNUXn+AMMEVXUhciSxm49gAAAJDpgLSk6YC0
|
||||||
|
pAAAAAtzc2gtZWQyNTUxOQAAACDpOc36b8DXNzM7U06RPdMyyNUXn+AMMEVXUhciSxm49g
|
||||||
|
AAAECSeskxuEtJrr9L7ZkbpogXC5pKRNVHx1ueMX2h1XUnmek5zfpvwNc3MztTTpE90zLI
|
||||||
|
1Ref4AwwRVdSFyJLGbj2AAAAB3Rlc3RrZXkBAgMEBQY=
|
||||||
|
-----END OPENSSH PRIVATE KEY-----
|
||||||
|
";
|
||||||
|
/// Manually extracted from the key using <https://dnaeon.github.io/openssh-private-key-binary-format/>, probably wrong
|
||||||
|
const PRIVKEY_BYTES: &[u8; 32] = &[
|
||||||
|
0xb8, 0x4b, 0x49, 0xae, 0xbf, 0x4b, 0xed, 0x99, 0x1b, 0xa6, 0x88, 0x17, 0x0b, 0x9a, 0x4a, 0x44,
|
||||||
|
0xd5, 0x47, 0xc7, 0x5b, 0x9e, 0x31, 0x7d, 0xa1, 0xd5, 0x75, 0x27, 0x99, 0xe9, 0x39, 0xcd, 0xfa,
|
||||||
|
];
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use crate::{MsgKind, PacketParser, ServerConnection};
|
||||||
|
|
||||||
|
trait OptionExt {
|
||||||
|
fn unwrap_none(self);
|
||||||
|
}
|
||||||
|
impl<T> OptionExt for Option<T> {
|
||||||
|
#[track_caller]
|
||||||
|
fn unwrap_none(self) {
|
||||||
|
assert!(self.is_none());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn protocol_exchange() {
|
||||||
|
let mut con = ServerConnection::default();
|
||||||
|
con.recv_bytes(b"SSH-2.0-OpenSSH_9.7\r\n").unwrap();
|
||||||
|
let msg = con.next_message_to_send().unwrap();
|
||||||
|
assert_eq!(msg.0, MsgKind::ServerProtocolInfo);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn protocol_exchange_slow_client() {
|
||||||
|
let mut con = ServerConnection::default();
|
||||||
|
con.recv_bytes(b"SSH-2.0-").unwrap();
|
||||||
|
con.recv_bytes(b"OpenSSH_9.7\r\n").unwrap();
|
||||||
|
let msg = con.next_message_to_send().unwrap();
|
||||||
|
assert_eq!(msg.0, MsgKind::ServerProtocolInfo);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn packet_parser() {
|
||||||
|
let mut p = PacketParser::new();
|
||||||
|
p.test_recv_bytes(&2_u32.to_be_bytes(), ()).unwrap_none();
|
||||||
|
p.test_recv_bytes(&[1], ()).unwrap_none();
|
||||||
|
let (consumed, data) = p.test_recv_bytes(&[2], ()).unwrap();
|
||||||
|
assert_eq!(consumed, 1);
|
||||||
|
assert_eq!(data, &[1, 2]);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn packet_parser_split_len() {
|
||||||
|
let mut p = PacketParser::new();
|
||||||
|
let len = &2_u32.to_be_bytes();
|
||||||
|
p.test_recv_bytes(&len[0..2], ()).unwrap_none();
|
||||||
|
p.test_recv_bytes(&len[2..4], ()).unwrap_none();
|
||||||
|
|
||||||
|
p.test_recv_bytes(&[1], ()).unwrap_none();
|
||||||
|
let (consumed, data) = p.test_recv_bytes(&[2], ()).unwrap();
|
||||||
|
assert_eq!(consumed, 1);
|
||||||
|
assert_eq!(data, &[1, 2]);
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn packet_parser_all() {
|
||||||
|
let mut p = PacketParser::new();
|
||||||
|
let (consumed, data) = p.test_recv_bytes(&[0, 0, 0, 2, 1, 2], ()).unwrap();
|
||||||
|
assert_eq!(consumed, 6);
|
||||||
|
assert_eq!(data, &[1, 2]);
|
||||||
|
}
|
||||||
|
}
|
||||||
65
src/main.rs
Normal file
65
src/main.rs
Normal file
|
|
@ -0,0 +1,65 @@
|
||||||
|
use std::net::SocketAddr;
|
||||||
|
|
||||||
|
use eyre::{Context, Result};
|
||||||
|
use fakessh::{ServerConnection, SshError};
|
||||||
|
use tokio::{
|
||||||
|
io::{AsyncReadExt, AsyncWriteExt},
|
||||||
|
net::{TcpListener, TcpStream},
|
||||||
|
};
|
||||||
|
use tracing::{error, info};
|
||||||
|
|
||||||
|
#[tokio::main]
|
||||||
|
async fn main() -> eyre::Result<()> {
|
||||||
|
tracing_subscriber::fmt().init();
|
||||||
|
|
||||||
|
let listener = TcpListener::bind("0.0.0.0:2222")
|
||||||
|
.await
|
||||||
|
.wrap_err("binding listener")?;
|
||||||
|
|
||||||
|
loop {
|
||||||
|
let next = listener.accept().await?;
|
||||||
|
|
||||||
|
tokio::spawn(async {
|
||||||
|
if let Err(err) = handle_connection(next).await {
|
||||||
|
error!(?err, "error handling connection");
|
||||||
|
}
|
||||||
|
});
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
async fn handle_connection(next: (TcpStream, SocketAddr)) -> Result<()> {
|
||||||
|
let (mut conn, addr) = next;
|
||||||
|
|
||||||
|
info!(?addr, "Received a new connection");
|
||||||
|
|
||||||
|
let mut state = ServerConnection::default();
|
||||||
|
|
||||||
|
loop {
|
||||||
|
let mut buf = [0; 1024];
|
||||||
|
let read = conn
|
||||||
|
.read(&mut buf)
|
||||||
|
.await
|
||||||
|
.wrap_err("reading from connection")?;
|
||||||
|
if read == 0 {
|
||||||
|
return Ok(());
|
||||||
|
}
|
||||||
|
|
||||||
|
if let Err(err) = state.recv_bytes(&buf[..read]) {
|
||||||
|
match err {
|
||||||
|
SshError::ClientError(err) => {
|
||||||
|
info!(?err, "disconnecting client after invalid operation");
|
||||||
|
return Ok(());
|
||||||
|
}
|
||||||
|
SshError::ServerError(err) => {
|
||||||
|
return Err(err);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
while let Some(msg) = state.next_message_to_send() {
|
||||||
|
conn.write_all(&msg.to_bytes_inefficient())
|
||||||
|
.await
|
||||||
|
.wrap_err("writing response")?;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
147
src/parse.rs
Normal file
147
src/parse.rs
Normal file
|
|
@ -0,0 +1,147 @@
|
||||||
|
use core::str;
|
||||||
|
use std::fmt::Debug;
|
||||||
|
|
||||||
|
use crate::Result;
|
||||||
|
|
||||||
|
/// A simplified `byteorder` clone that emits client errors when the data is too short.
|
||||||
|
pub(crate) struct Parser<'a>(&'a [u8]);
|
||||||
|
|
||||||
|
impl<'a> Parser<'a> {
|
||||||
|
pub(crate) fn new(data: &'a [u8]) -> Self {
|
||||||
|
Self(data)
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn u8(&mut self) -> Result<u8> {
|
||||||
|
let arr = self.read_array::<1>()?;
|
||||||
|
Ok(arr[0])
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn u16(&mut self) -> Result<u16> {
|
||||||
|
let arr = self.read_array()?;
|
||||||
|
Ok(u16::from_be_bytes(arr))
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn u32(&mut self) -> Result<u32> {
|
||||||
|
let arr = self.read_array()?;
|
||||||
|
Ok(u32::from_be_bytes(arr))
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn read_array<const N: usize>(&mut self) -> Result<[u8; N]> {
|
||||||
|
if self.0.len() < N {
|
||||||
|
return Err(crate::client_error!("packet too short"));
|
||||||
|
}
|
||||||
|
let result = self.0[..N].try_into().unwrap();
|
||||||
|
self.0 = &self.0[N..];
|
||||||
|
Ok(result)
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn read_slice(&mut self, len: usize) -> Result<&'a [u8]> {
|
||||||
|
if self.0.len() < len {
|
||||||
|
return Err(crate::client_error!("packet too short"));
|
||||||
|
}
|
||||||
|
let result = &self.0[..len];
|
||||||
|
self.0 = &self.0[len..];
|
||||||
|
Ok(result)
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn bool(&mut self) -> Result<bool> {
|
||||||
|
let b = self.u8()?;
|
||||||
|
match b {
|
||||||
|
0 => Ok(false),
|
||||||
|
1 => Ok(true),
|
||||||
|
_ => return Err(crate::client_error!("invalid bool: {b}")),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn name_list(&mut self) -> Result<NameList<'a>> {
|
||||||
|
let len = self.u32()?;
|
||||||
|
let list = self.read_slice(len.try_into().unwrap())?;
|
||||||
|
let Ok(list) = str::from_utf8(list) else {
|
||||||
|
return Err(crate::client_error!("name-list is invalid UTF-8"));
|
||||||
|
};
|
||||||
|
Ok(NameList(list))
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn mpint(&mut self) -> Result<MpInt<'a>> {
|
||||||
|
let len = self.u32()?;
|
||||||
|
let data = self.read_slice(len as usize)?;
|
||||||
|
Ok(MpInt(data))
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// A simplified `byteorder` clone that emits client errors when the data is too short.
|
||||||
|
pub(crate) struct Writer(Vec<u8>);
|
||||||
|
|
||||||
|
impl Writer {
|
||||||
|
pub(crate) fn new() -> Self {
|
||||||
|
Self(Vec::new())
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn u8(&mut self, v: u8) {
|
||||||
|
self.write(&[v]);
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn u32(&mut self, v: u32) {
|
||||||
|
self.write(&u32::to_be_bytes(v));
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn write(&mut self, v: &[u8]) {
|
||||||
|
self.0.extend_from_slice(v);
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn name_list(&mut self, list: NameList<'_>) {
|
||||||
|
self.string(list.0.as_bytes());
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn mpint(&mut self, mpint: MpInt<'_>) {
|
||||||
|
self.string(mpint.0);
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn string(&mut self, data: &[u8]) {
|
||||||
|
self.u32(data.len() as u32);
|
||||||
|
self.write(data);
|
||||||
|
}
|
||||||
|
|
||||||
|
pub(crate) fn finish(self) -> Vec<u8> {
|
||||||
|
self.0
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Clone, Copy)]
|
||||||
|
pub struct NameList<'a>(&'a str);
|
||||||
|
|
||||||
|
impl<'a> NameList<'a> {
|
||||||
|
pub(crate) fn one(item: &'a str) -> Self {
|
||||||
|
if item.contains(',') {
|
||||||
|
panic!("tried creating name list with comma in item: {item}");
|
||||||
|
}
|
||||||
|
Self(item)
|
||||||
|
}
|
||||||
|
pub(crate) fn none() -> NameList<'static> {
|
||||||
|
NameList("")
|
||||||
|
}
|
||||||
|
pub(crate) fn iter(&self) -> std::str::Split<char> {
|
||||||
|
self.0.split(',')
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Debug for NameList<'_> {
|
||||||
|
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
|
||||||
|
self.0.fmt(f)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, Clone, Copy)]
|
||||||
|
pub struct MpInt<'a>(pub(crate) &'a [u8]);
|
||||||
|
|
||||||
|
impl<'a> MpInt<'a> {
|
||||||
|
pub(crate) fn to_x25519_public_key(&self) -> Result<x25519_dalek::PublicKey> {
|
||||||
|
let Ok(arr) = <[u8; 32]>::try_from(self.0) else {
|
||||||
|
return Err(crate::client_error!(
|
||||||
|
"invalid x25519 public key length, should be 32, was: {}",
|
||||||
|
self.0.len()
|
||||||
|
));
|
||||||
|
};
|
||||||
|
Ok(x25519_dalek::PublicKey::from(arr))
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Add table
Add a link
Reference in a new issue