cleanup
This commit is contained in:
Jakub Doka
parent
c7dbe1c43d
commit
13f63c7700
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@ -1,11 +1,11 @@
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#![feature(array_windows)]
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#![feature(array_chunks)]
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#![feature(write_all_vectored)]
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use {
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aes_gcm::{
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aead::{self, AeadMutInPlace},
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AeadCore, Aes256Gcm, KeyInit,
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},
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ed25519_dalek::ed25519::signature::Signer,
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ed25519_dalek::{self as ed, ed25519::signature::Signer},
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rand_core::OsRng,
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std::{
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collections::{HashMap, HashSet},
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@ -16,88 +16,51 @@ use {
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path::PathBuf,
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slice,
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str::FromStr,
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sync::{atomic, OnceLock},
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sync::{
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atomic::{self, AtomicUsize},
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Arc, Mutex,
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},
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time,
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},
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x25519_dalek::{EphemeralSecret, SharedSecret},
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x25519_dalek::{self as x, EphemeralSecret, SharedSecret},
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};
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static CONN_COUNT: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
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static USER_DATA_DIR: OnceLock<PathBuf> = OnceLock::new();
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static SERVER_SECRET: OnceLock<ed25519_dalek::SigningKey> = OnceLock::new();
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type Subcommand<'a, T> = (&'a str, &'a str, T);
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type BaseSubcommand<'a> = Subcommand<'a, fn(&Cli) -> io::Result<()>>;
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type ConsumeSubcommand<'a> = Subcommand<'a, fn(&Cli, EncriptedStream) -> io::Result<()>>;
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#[derive(Default)]
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struct Cli {
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program: String,
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args: Vec<String>,
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flags: HashSet<String>,
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options: HashMap<String, String>,
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}
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type Username = [u8; 32];
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type Postname = [u8; 64];
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type Pk = [u8; 32];
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type Nonce = u64;
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impl Cli {
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pub fn parse() -> Self {
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let mut s = Self::default();
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let mut args = std::env::args();
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s.program = args.next().unwrap();
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for arg in args {
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if let Some(arg) = arg.strip_prefix("--") {
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match arg.split_once('=') {
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Some((name, value)) => _ = s.options.insert(name.to_owned(), value.to_owned()),
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None => _ = s.flags.insert(arg.to_string()),
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}
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} else {
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s.args.push(arg);
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}
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}
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s
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}
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pub fn arg(&self, index: usize) -> &str {
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self.args.get(index).map_or("", String::as_str)
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}
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pub fn expect_option(&self, name: &str) -> &str {
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self.options.get(name).unwrap_or_else(|| panic!("--{name} is mandatory"))
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}
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pub fn expect_poption<T: FromStr<Err: fmt::Display>>(&self, name: &str) -> T {
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self.expect_option(name).parse::<T>().unwrap_or_else(|e| {
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panic!("failed to parse --{name} as {}: {e}", std::any::type_name::<T>())
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})
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}
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}
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type Subcommand<'a> = (&'a str, &'a str, fn(&Cli) -> io::Result<()>);
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fn help<T>(subs: &[(&str, &str, T)]) -> io::Result<()> {
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for (name, desc, _) in subs {
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eprintln!("{name} - {desc}");
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}
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Err(io::ErrorKind::NotFound.into())
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}
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const SUBCOMMANDS: &[Subcommand] = &[
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const SUBCOMMANDS: &[BaseSubcommand] = &[
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("help", "print command descriptions", |_| help(SUBCOMMANDS)),
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("serve", "run the server", |cli| {
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let port = cli.expect_poption::<u16>("port");
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let max_conns = cli.expect_poption::<usize>("max-conns");
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USER_DATA_DIR.set(cli.expect_poption("user-data-path")).unwrap();
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SERVER_SECRET.set(cli.expect_poption::<HexSk>("secret").0).unwrap();
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let config = Arc::new(ServerState {
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user_data_dir: cli.expect_poption("user-data-path"),
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secret: cli.expect_poption::<HexSk>("secret").0,
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active_ips: Default::default(),
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max_conns: cli.expect_poption::<usize>("max-conns"),
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conn_count: Default::default(),
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});
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let listener = TcpListener::bind((Ipv4Addr::UNSPECIFIED, port)).unwrap();
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for incoming in listener.incoming() {
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match incoming {
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Ok(c) => {
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if CONN_COUNT.fetch_add(1, atomic::Ordering::Relaxed) >= max_conns {
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CONN_COUNT.fetch_sub(1, atomic::Ordering::Relaxed);
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let Ok(std::net::SocketAddr::V4(addr)) =
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c.peer_addr().ctx("obtaining socket addr")
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else {
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continue;
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}
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};
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std::thread::spawn(move || {
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_ = handle_client(c);
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CONN_COUNT.fetch_sub(1, atomic::Ordering::Relaxed);
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});
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let Some(guard) = ConnectionGuard::new(config.clone(), *addr.ip()) else {
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continue;
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};
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std::thread::spawn(move || _ = guard.config.handle_client(c));
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}
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Err(e) => {
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eprintln!("accepting conn conn: {e}")
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@ -106,13 +69,24 @@ const SUBCOMMANDS: &[Subcommand] = &[
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}
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Ok(())
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}),
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("make-secret", "creates secret usable by the server", |_| {
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println!("{}", DisplayHex(ed::SigningKey::generate(&mut OsRng).to_bytes()));
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Ok(())
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}),
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("make-ping-command", "create a ping command to handshake with the server", |cli| {
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let HexSk(secret) = cli.expect_poption::<HexSk>("secret");
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let addr = cli.expect_poption::<SocketAddrV4>("addr");
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let id = DisplayHex(ed::VerifyingKey::from(&secret).to_bytes());
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println!("depell consume --server-identity={id} --addr={addr} ping");
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Ok(())
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}),
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("make-profile", "create profile file (private key + name)", |cli| {
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let name = cli.expect_option("name");
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let name = str_as_username(name)
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.ok_or(io::ErrorKind::InvalidData)
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.ctx("name is limmited to 32 characters")?;
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let &key = ed25519_dalek::SigningKey::generate(&mut rand_core::OsRng).as_bytes();
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let &key = ed::SigningKey::generate(&mut rand_core::OsRng).as_bytes();
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let profile = UserProfile { name, key };
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let out_file = cli.expect_option("out-file");
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@ -123,7 +97,7 @@ const SUBCOMMANDS: &[Subcommand] = &[
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let profile_path = cli.expect_option("profile");
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let mut profile_file = fs::File::open(profile_path).ctx("opening profile file")?;
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let profile: UserProfile = read_struct(&mut profile_file).ctx("reading the profile")?;
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let sx = x25519_dalek::EphemeralSecret::random_from_rng(OsRng);
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let sx = x::EphemeralSecret::random_from_rng(OsRng);
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let auth = UserAuth::sign(profile, &sx);
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let addr = cli.expect_poption::<SocketAddrV4>("addr");
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@ -133,7 +107,7 @@ const SUBCOMMANDS: &[Subcommand] = &[
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let HexPk(server_identity) = cli.expect_poption("server-identity");
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let sauth: ServerAuth = read_struct(&mut stream).ctx("reading server auth")?;
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let secret = sauth
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.verify(auth.pk, server_identity, sx)
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.verify(auth.x, server_identity, sx)
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.map_err(|_| io::ErrorKind::PermissionDenied)
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.ctx("authenticating server")?;
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let stream = EncriptedStream::new(stream, secret);
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@ -142,94 +116,112 @@ const SUBCOMMANDS: &[Subcommand] = &[
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}),
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];
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type ConsumeSubcommand<'a> = (&'a str, &'a str, fn(&Cli, EncriptedStream) -> io::Result<()>);
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const CONSUME_SUBCOMMAND: &[ConsumeSubcommand] = &[
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("help", "this help message", |_, _| help(CONSUME_SUBCOMMAND)),
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("ping", "ping the server to check the connection", |_, mut stream| {
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write_struct(&mut stream, &Qid::Ping)
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}), //
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let now = time::Instant::now();
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write_struct(&mut stream, &Qid::Ping)?;
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if !matches!(Aid::try_from(read_struct::<u16>(&mut stream)?)?, Aid::Pong) {
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eprintln!("server did not respond with ping");
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}
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println!("{:?}", now.elapsed());
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Ok(())
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}),
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];
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fn hex_to_array<const SIZE: usize>(s: &str) -> Result<[u8; SIZE], &'static str> {
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let mut buf = [0u8; SIZE];
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if s.len() != SIZE * 2 {
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return Err("expected 64 character hex string");
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}
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fn byte_to_hex(val: u8) -> Result<u8, &'static str> {
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Ok(match val {
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b'0'..=b'9' => val - b'0',
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b'a'..=b'f' => val - b'a' + 10,
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b'A'..=b'F' => val - b'A' + 10,
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_ => return Err("invalid hex char"),
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})
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}
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for (dst, &[a, b]) in buf.iter_mut().zip(s.as_bytes().array_windows()) {
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*dst = byte_to_hex(a)? | (byte_to_hex(b)? << 4);
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}
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Ok(buf)
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}
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struct HexPk(ed25519_dalek::VerifyingKey);
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impl std::str::FromStr for HexPk {
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type Err = &'static str;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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ed25519_dalek::VerifyingKey::from_bytes(&hex_to_array(s)?)
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.map_err(|_| "hex code does not represent the valid key")
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.map(Self)
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}
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}
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struct HexSk(ed25519_dalek::SigningKey);
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impl std::str::FromStr for HexSk {
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type Err = &'static str;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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Ok(Self(ed25519_dalek::SigningKey::from_bytes(&hex_to_array(s)?)))
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}
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}
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fn select_subcommand<'a, T>(depth: usize, list: &'a [(&str, &str, T)], cli: &Cli) -> &'a T {
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&list.iter().find(|&&(name, ..)| name == cli.arg(depth)).unwrap_or(&list[0]).2
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}
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fn main() -> io::Result<()> {
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let cli = Cli::parse();
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select_subcommand(0, SUBCOMMANDS, &cli)(&cli)
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}
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fn handle_client(mut stream: TcpStream) -> io::Result<()> {
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let (user, sec) = {
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let user_auth: UserAuth = read_struct(&mut stream).ctx("reading auth packet")?;
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let sx = x25519_dalek::EphemeralSecret::random_from_rng(OsRng);
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let pk = x25519_dalek::PublicKey::from(&sx);
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let user = UserData::load(&user_auth, sx).ctx("loading user data")?;
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let sauth = ServerAuth::sign(&user_auth, SERVER_SECRET.get().unwrap(), pk);
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write_struct(&mut stream, &sauth).ctx("sending handshare response")?;
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user
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};
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fn help<T>(subs: &[Subcommand<T>]) -> io::Result<()> {
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for (name, desc, _) in subs {
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eprintln!("{name} - {desc}");
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}
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Err(io::ErrorKind::NotFound.into())
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}
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let mut stream = EncriptedStream::new(stream, sec);
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fn select_subcommand<'a, T>(depth: usize, list: &'a [Subcommand<T>], cli: &Cli) -> &'a T {
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&list.iter().find(|&&(name, ..)| name == cli.arg(depth)).unwrap_or(&list[0]).2
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}
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loop {
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match Qid::try_from(read_struct::<u16>(&mut stream)?)? {
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Qid::Ping => write_struct(&mut stream, &Aid::Pong)?,
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struct ServerState {
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user_data_dir: PathBuf,
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secret: ed::SigningKey,
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max_conns: usize,
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active_ips: Mutex<HashSet<Ipv4Addr>>,
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conn_count: AtomicUsize,
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}
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impl ServerState {
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fn handle_client(&self, mut stream: TcpStream) -> io::Result<()> {
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let (user, sec) = {
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let user_auth: UserAuth = read_struct(&mut stream).ctx("reading auth packet")?;
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let sx = x::EphemeralSecret::random_from_rng(OsRng);
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let pk = x::PublicKey::from(&sx);
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let user = UserData::load(&user_auth, sx, self).ctx("loading user data")?;
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let sauth = ServerAuth::sign(&user_auth, &self.secret, pk);
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write_struct(&mut stream, &sauth).ctx("sending handshare response")?;
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user
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};
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let mut stream = EncriptedStream::new(stream, sec);
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loop {
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match Qid::try_from(read_struct::<u16>(&mut stream)?)? {
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Qid::Ping => write_struct(&mut stream, &Aid::Pong)?,
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}
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}
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}
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}
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struct ConnectionGuard {
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ip: Ipv4Addr,
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config: Arc<ServerState>,
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}
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impl ConnectionGuard {
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fn new(config: Arc<ServerState>, ip: Ipv4Addr) -> Option<Self> {
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if config.conn_count.fetch_add(1, atomic::Ordering::Relaxed) >= config.max_conns {
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eprintln!("max connection cap reached");
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config.conn_count.fetch_sub(1, atomic::Ordering::Relaxed);
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return None;
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}
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if !config.active_ips.lock().unwrap().insert(ip) {
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eprintln!("ip already connected, dropping connection");
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config.conn_count.fetch_sub(1, atomic::Ordering::Relaxed);
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return None;
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}
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Some(Self { ip, config })
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}
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}
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impl Drop for ConnectionGuard {
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fn drop(&mut self) {
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self.config.active_ips.lock().unwrap().remove(&self.ip);
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self.config.conn_count.fetch_sub(1, atomic::Ordering::Relaxed);
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}
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}
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#[repr(u16)]
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enum Aid {
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Pong,
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}
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impl TryFrom<u16> for Aid {
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type Error = io::ErrorKind;
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fn try_from(value: u16) -> Result<Self, Self::Error> {
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if value <= Self::Pong as u16 {
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Ok(unsafe { mem::transmute::<u16, Self>(value) })
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} else {
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Err(io::ErrorKind::NotFound)
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}
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}
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}
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#[repr(u16)]
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enum Qid {
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Ping,
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@ -240,7 +232,7 @@ impl TryFrom<u16> for Qid {
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fn try_from(value: u16) -> Result<Self, Self::Error> {
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if value <= Self::Ping as u16 {
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Ok(unsafe { mem::transmute::<u16, Qid>(value) })
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Ok(unsafe { mem::transmute::<u16, Self>(value) })
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} else {
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Err(io::ErrorKind::NotFound)
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}
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@ -260,7 +252,191 @@ impl<O, E: fmt::Display> Ctx for Result<O, E> {
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}
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}
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const ASOC_DATA: &[u8] = b"testicle torsion vizard";
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fn username_as_str(name: &Username) -> Option<&str> {
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let len = name.iter().rposition(|&b| b != 0xff)? + 1;
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std::str::from_utf8(&name[..len]).ok()
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}
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fn str_as_username(name: &str) -> Option<Username> {
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if name.len() > mem::size_of::<Username>() {
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return None;
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}
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let mut buff = [0xffu8; mem::size_of::<Username>()];
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buff[..name.len()].copy_from_slice(name.as_bytes());
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Some(buff)
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}
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#[repr(packed)]
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struct UserProfile {
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name: Username,
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key: ed::SecretKey,
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}
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|
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#[repr(packed)]
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struct UserAuth {
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signature: ed::Signature,
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pk: Pk,
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x: x::PublicKey,
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name: Username,
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nonce: Nonce,
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}
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|
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impl UserAuth {
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fn sign(UserProfile { name, key }: UserProfile, sx: &x::EphemeralSecret) -> Self {
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let nonce =
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time::SystemTime::now().duration_since(time::SystemTime::UNIX_EPOCH).unwrap().as_secs();
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let mut message = [0; mem::size_of::<Username>() + mem::size_of::<u64>()];
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message[..mem::size_of::<Username>()].copy_from_slice(&name);
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message[mem::size_of::<Username>()..].copy_from_slice(&nonce.to_le_bytes());
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let signing_key = ed::SigningKey::from_bytes(&key);
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let signature = signing_key.sign(&message);
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let pk = ed::VerifyingKey::from(&signing_key).to_bytes();
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let x = x::PublicKey::from(sx);
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Self { signature, pk, x, name, nonce }
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}
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fn verify(
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&self,
|
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pk: Pk,
|
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nonce: Nonce,
|
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sx: x::EphemeralSecret,
|
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) -> Result<SharedSecret, ed::SignatureError> {
|
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if nonce >= self.nonce {
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eprintln!("invalid auth nonce");
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return Err(ed::SignatureError::default());
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}
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|
||||
let pk = ed::VerifyingKey::from_bytes(&pk)?;
|
||||
|
||||
let mut message = [0; mem::size_of::<Username>() + mem::size_of::<u64>()];
|
||||
message[..mem::size_of::<Username>()].copy_from_slice(&self.name);
|
||||
message[mem::size_of::<Username>()..].copy_from_slice(&self.nonce.to_le_bytes());
|
||||
|
||||
pk.verify_strict(&message, &self.signature)?;
|
||||
|
||||
Ok(sx.diffie_hellman(&self.x))
|
||||
}
|
||||
}
|
||||
|
||||
#[repr(packed)]
|
||||
struct ServerAuth {
|
||||
signature: ed::Signature,
|
||||
x: x::PublicKey,
|
||||
}
|
||||
|
||||
impl ServerAuth {
|
||||
fn sign(user_auth: &UserAuth, sk: &ed::SigningKey, x: x::PublicKey) -> Self {
|
||||
let signature = sk.sign(user_auth.x.as_bytes());
|
||||
Self { signature, x }
|
||||
}
|
||||
|
||||
fn verify(
|
||||
&self,
|
||||
x: x::PublicKey,
|
||||
pk: ed::VerifyingKey,
|
||||
sx: EphemeralSecret,
|
||||
) -> Result<SharedSecret, ed::SignatureError> {
|
||||
pk.verify_strict(x.as_bytes(), &self.signature)?;
|
||||
Ok(sx.diffie_hellman(&self.x))
|
||||
}
|
||||
}
|
||||
|
||||
struct UserData {
|
||||
header: UserHeader,
|
||||
post_headers: fs::File,
|
||||
posts: fs::File,
|
||||
}
|
||||
|
||||
impl UserData {
|
||||
fn load(
|
||||
auth: &UserAuth,
|
||||
sx: x::EphemeralSecret,
|
||||
config: &ServerState,
|
||||
) -> io::Result<(Self, SharedSecret)> {
|
||||
const HEADER_PATH: &str = "header.bin";
|
||||
const POST_HEADERS_PATH: &str = "post-headers.bin";
|
||||
const POST_PATH: &str = "posts.bin";
|
||||
|
||||
let mut path = PathBuf::from_iter([
|
||||
config.user_data_dir.as_path(),
|
||||
username_as_str(&auth.name).ok_or(io::ErrorKind::InvalidData)?.as_ref(),
|
||||
]);
|
||||
|
||||
if path.exists() {
|
||||
let mut opts = fs::OpenOptions::new();
|
||||
opts.write(true).read(true);
|
||||
|
||||
path.push(HEADER_PATH);
|
||||
let mut header_file = opts.open(&path).ctx("opening user header file")?;
|
||||
let mut header: UserHeader =
|
||||
read_struct(&mut header_file).ctx("reading the user header")?;
|
||||
path.pop();
|
||||
|
||||
let secret = auth
|
||||
.verify(header.pk, header.nonce, sx)
|
||||
.map_err(|_| io::ErrorKind::PermissionDenied)
|
||||
.ctx("authenticating user")?;
|
||||
|
||||
header.nonce = auth.nonce;
|
||||
write_struct(&mut header_file, &header).ctx("saving user nonce")?;
|
||||
|
||||
path.push(POST_HEADERS_PATH);
|
||||
let post_headers = opts.open(&path).ctx("opening user post header file")?;
|
||||
path.pop();
|
||||
|
||||
path.push(POST_PATH);
|
||||
let posts = opts.open(&path).ctx("opening user post file")?;
|
||||
path.pop();
|
||||
|
||||
Ok((Self { header, post_headers, posts }, secret))
|
||||
} else {
|
||||
let secret = auth
|
||||
.verify(auth.pk, 0, sx)
|
||||
.map_err(|_| io::ErrorKind::PermissionDenied)
|
||||
.ctx("verifiing registratio signature")?;
|
||||
|
||||
fs::create_dir_all(&path).ctx("creating new user directory")?;
|
||||
path.push(HEADER_PATH);
|
||||
let header =
|
||||
UserHeader { pk: auth.pk, nonce: auth.nonce, post_count: 0, runs: 0, imports: 0 };
|
||||
fs::write(&path, as_bytes(&header)).ctx("writing new user header")?;
|
||||
path.pop();
|
||||
|
||||
path.push(POST_HEADERS_PATH);
|
||||
let post_headers = fs::File::create_new(&path).ctx("creating new user post headers")?;
|
||||
path.pop();
|
||||
|
||||
path.push(POST_PATH);
|
||||
let posts = fs::File::create_new(&path).ctx("creating new user posts")?;
|
||||
path.pop();
|
||||
|
||||
Ok((Self { header, post_headers, posts }, secret))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[repr(packed)]
|
||||
struct UserHeader {
|
||||
pk: Pk,
|
||||
nonce: Nonce,
|
||||
post_count: u32,
|
||||
imports: u32,
|
||||
runs: u32,
|
||||
}
|
||||
|
||||
#[repr(packed)]
|
||||
struct PostHeader {
|
||||
name: Postname,
|
||||
timestamp: u64,
|
||||
size: u32,
|
||||
offset: u32,
|
||||
imports: u32,
|
||||
runs: u32,
|
||||
}
|
||||
|
||||
const ASOC_DATA: &[u8] = b"testicle torsion wizard";
|
||||
|
||||
struct EncriptedStream {
|
||||
inner: TcpStream,
|
||||
|
|
@ -339,7 +515,7 @@ impl Write for EncriptedStream {
|
|||
fn read_struct<T>(stream: &mut impl Read) -> io::Result<T> {
|
||||
let mut res = mem::MaybeUninit::uninit();
|
||||
stream.read_exact(as_mut_bytes(&mut res))?;
|
||||
unsafe { res.assume_init() }
|
||||
Ok(unsafe { res.assume_init() })
|
||||
}
|
||||
|
||||
fn write_struct<T>(stream: &mut impl Write, value: &T) -> io::Result<()> {
|
||||
|
|
@ -354,191 +530,112 @@ fn as_bytes<T>(value: &T) -> &[u8] {
|
|||
unsafe { slice::from_raw_parts(value as *const _ as *const u8, mem::size_of::<T>()) }
|
||||
}
|
||||
|
||||
type Username = [u8; 32];
|
||||
type Postname = [u8; 64];
|
||||
type Pk = [u8; 32];
|
||||
type Nonce = u64;
|
||||
|
||||
fn username_as_str(name: &Username) -> Option<&str> {
|
||||
let len = name.iter().rposition(|&b| b != 0xff)? + 1;
|
||||
std::str::from_utf8(&name[..len]).ok()
|
||||
#[derive(Default)]
|
||||
struct Cli {
|
||||
program: String,
|
||||
args: Vec<String>,
|
||||
flags: HashSet<String>,
|
||||
options: HashMap<String, String>,
|
||||
}
|
||||
|
||||
fn str_as_username(name: &str) -> Option<Username> {
|
||||
if name.len() > mem::size_of::<Username>() {
|
||||
return None;
|
||||
}
|
||||
let mut buff = [0xffu8; mem::size_of::<Username>()];
|
||||
buff[..name.len()].copy_from_slice(name.as_bytes());
|
||||
Some(buff)
|
||||
}
|
||||
impl Cli {
|
||||
pub fn parse() -> Self {
|
||||
let mut s = Self::default();
|
||||
let mut args = std::env::args();
|
||||
s.program = args.next().unwrap();
|
||||
|
||||
#[repr(packed)]
|
||||
struct UserProfile {
|
||||
name: Username,
|
||||
key: ed25519_dalek::SecretKey,
|
||||
}
|
||||
|
||||
#[repr(packed)]
|
||||
struct UserAuth {
|
||||
signature: ed25519_dalek::Signature,
|
||||
pk: Pk,
|
||||
x: x25519_dalek::PublicKey,
|
||||
name: Username,
|
||||
nonce: Nonce,
|
||||
}
|
||||
|
||||
impl UserAuth {
|
||||
fn sign(UserProfile { name, key }: UserProfile, sx: &x25519_dalek::EphemeralSecret) -> Self {
|
||||
let nonce =
|
||||
time::SystemTime::now().duration_since(time::SystemTime::UNIX_EPOCH).unwrap().as_secs();
|
||||
let mut message = [0; mem::size_of::<Username>() + mem::size_of::<u64>()];
|
||||
message[..mem::size_of::<Username>()].copy_from_slice(&name);
|
||||
message[mem::size_of::<Username>()..].copy_from_slice(&nonce.to_le_bytes());
|
||||
|
||||
let signing_key = ed25519_dalek::SigningKey::from_bytes(&key);
|
||||
let signature = signing_key.sign(&message);
|
||||
let pk = ed25519_dalek::VerifyingKey::from(&signing_key).to_bytes();
|
||||
let x = x25519_dalek::PublicKey::from(sx);
|
||||
|
||||
Self { signature, pk, x, name, nonce }
|
||||
}
|
||||
|
||||
fn verify(
|
||||
&self,
|
||||
pk: Pk,
|
||||
nonce: Nonce,
|
||||
sx: x25519_dalek::EphemeralSecret,
|
||||
) -> Result<SharedSecret, ed25519_dalek::SignatureError> {
|
||||
if nonce >= self.nonce {
|
||||
eprintln!("invalid auth nonce");
|
||||
return Err(ed25519_dalek::SignatureError::default());
|
||||
for arg in args {
|
||||
if let Some(arg) = arg.strip_prefix("--") {
|
||||
match arg.split_once('=') {
|
||||
Some((name, value)) => _ = s.options.insert(name.to_owned(), value.to_owned()),
|
||||
None => _ = s.flags.insert(arg.to_string()),
|
||||
}
|
||||
} else {
|
||||
s.args.push(arg);
|
||||
}
|
||||
}
|
||||
|
||||
let pk = ed25519_dalek::VerifyingKey::from_bytes(&pk)?;
|
||||
s
|
||||
}
|
||||
|
||||
let mut message = [0; mem::size_of::<Username>() + mem::size_of::<u64>()];
|
||||
message[..mem::size_of::<Username>()].copy_from_slice(&self.name);
|
||||
message[mem::size_of::<Username>()..].copy_from_slice(&nonce.to_le_bytes());
|
||||
pub fn arg(&self, index: usize) -> &str {
|
||||
self.args.get(index).map_or("", String::as_str)
|
||||
}
|
||||
|
||||
pk.verify_strict(&message, &self.signature)?;
|
||||
pub fn expect_option(&self, name: &str) -> &str {
|
||||
self.options.get(name).unwrap_or_else(|| panic!("--{name}= is mandatory"))
|
||||
}
|
||||
|
||||
Ok(sx.diffie_hellman(&self.x))
|
||||
pub fn expect_poption<T: FromStr<Err: fmt::Display>>(&self, name: &str) -> T {
|
||||
self.expect_option(name).parse::<T>().unwrap_or_else(|e| {
|
||||
panic!("failed to parse --{name}= as {}: {e}", std::any::type_name::<T>())
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
#[repr(packed)]
|
||||
struct ServerAuth {
|
||||
signature: ed25519_dalek::Signature,
|
||||
x: x25519_dalek::PublicKey,
|
||||
}
|
||||
fn hex_to_array<const SIZE: usize>(s: &str) -> Result<[u8; SIZE], &'static str> {
|
||||
let mut buf = [0u8; SIZE];
|
||||
|
||||
impl ServerAuth {
|
||||
fn sign(
|
||||
user_auth: &UserAuth,
|
||||
sk: &ed25519_dalek::SigningKey,
|
||||
x: x25519_dalek::PublicKey,
|
||||
) -> Self {
|
||||
let signature = sk.sign(user_auth.x.as_bytes());
|
||||
Self { signature, x }
|
||||
if s.len() != SIZE * 2 {
|
||||
return Err("expected 64 character hex string");
|
||||
}
|
||||
|
||||
fn verify(
|
||||
&self,
|
||||
x: Pk,
|
||||
pk: ed25519_dalek::VerifyingKey,
|
||||
sx: EphemeralSecret,
|
||||
) -> Result<SharedSecret, ed25519_dalek::SignatureError> {
|
||||
pk.verify_strict(&x, &self.signature)?;
|
||||
Ok(sx.diffie_hellman(&self.x))
|
||||
fn byte_to_hex(val: u8) -> Result<u8, &'static str> {
|
||||
Ok(match val {
|
||||
b'0'..=b'9' => val - b'0',
|
||||
b'a'..=b'f' => val - b'a' + 10,
|
||||
b'A'..=b'F' => val - b'A' + 10,
|
||||
_ => return Err("invalid hex char"),
|
||||
})
|
||||
}
|
||||
|
||||
for (dst, &[a, b]) in buf.iter_mut().zip(s.as_bytes().array_chunks()) {
|
||||
*dst = byte_to_hex(b)? | (byte_to_hex(a)? << 4);
|
||||
}
|
||||
|
||||
Ok(buf)
|
||||
}
|
||||
|
||||
struct HexPk(ed::VerifyingKey);
|
||||
|
||||
impl std::str::FromStr for HexPk {
|
||||
type Err = &'static str;
|
||||
|
||||
fn from_str(s: &str) -> Result<Self, Self::Err> {
|
||||
ed::VerifyingKey::from_bytes(&hex_to_array(s)?)
|
||||
.map_err(|_| "hex code does not represent the valid key")
|
||||
.map(Self)
|
||||
}
|
||||
}
|
||||
|
||||
struct UserData {
|
||||
header: UserHeader,
|
||||
post_headers: fs::File,
|
||||
posts: fs::File,
|
||||
struct HexSk(ed::SigningKey);
|
||||
|
||||
impl std::str::FromStr for HexSk {
|
||||
type Err = &'static str;
|
||||
|
||||
fn from_str(s: &str) -> Result<Self, Self::Err> {
|
||||
Ok(Self(ed::SigningKey::from_bytes(&hex_to_array(s)?)))
|
||||
}
|
||||
}
|
||||
|
||||
impl UserData {
|
||||
fn load(
|
||||
auth: &UserAuth,
|
||||
sx: x25519_dalek::EphemeralSecret,
|
||||
) -> io::Result<(Self, SharedSecret)> {
|
||||
const HEADER_PATH: &str = "header.bin";
|
||||
const POST_HEADERS_PATH: &str = "post-headers.bin";
|
||||
const POST_PATH: &str = "posts.bin";
|
||||
struct DisplayHex([u8; 32]);
|
||||
|
||||
let mut path = PathBuf::from_iter([
|
||||
USER_DATA_DIR.get().unwrap().as_path(),
|
||||
username_as_str(&auth.name).ok_or(io::ErrorKind::InvalidData)?.as_ref(),
|
||||
]);
|
||||
|
||||
if path.exists() {
|
||||
path.push(HEADER_PATH);
|
||||
let mut header_file = fs::File::open(&path).ctx("opening user header file")?;
|
||||
let mut header: UserHeader =
|
||||
read_struct(&mut header_file).ctx("reading the user header")?;
|
||||
path.pop();
|
||||
|
||||
let secret = auth
|
||||
.verify(header.pk, header.nonce, sx)
|
||||
.map_err(|_| io::ErrorKind::PermissionDenied)
|
||||
.ctx("authenticating user")?;
|
||||
|
||||
header.nonce = auth.nonce;
|
||||
write_struct(&mut header_file, &header).ctx("saving user nonce")?;
|
||||
|
||||
path.push(POST_HEADERS_PATH);
|
||||
let post_headers = fs::File::open(&path).ctx("opening user post header file")?;
|
||||
path.pop();
|
||||
|
||||
path.push(POST_PATH);
|
||||
let posts = fs::File::open(&path).ctx("opening user post file")?;
|
||||
path.pop();
|
||||
|
||||
Ok((Self { header, post_headers, posts }, secret))
|
||||
} else {
|
||||
let secret = auth
|
||||
.verify(auth.pk, 0, sx)
|
||||
.map_err(|_| io::ErrorKind::PermissionDenied)
|
||||
.ctx("verifiing registratio signature")?;
|
||||
|
||||
fs::create_dir_all(&path).ctx("creating new user directory")?;
|
||||
path.push(HEADER_PATH);
|
||||
let header =
|
||||
UserHeader { pk: auth.pk, nonce: auth.nonce, post_count: 0, runs: 0, imports: 0 };
|
||||
fs::write(&path, as_bytes(&header)).ctx("writing new user header")?;
|
||||
path.pop();
|
||||
|
||||
path.push(POST_HEADERS_PATH);
|
||||
let post_headers = fs::File::create_new(&path).ctx("creating new user post headers")?;
|
||||
path.pop();
|
||||
|
||||
path.push(POST_PATH);
|
||||
let posts = fs::File::create_new(&path).ctx("creating new user posts")?;
|
||||
path.pop();
|
||||
|
||||
Ok((Self { header, post_headers, posts }, secret))
|
||||
impl fmt::Display for DisplayHex {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
for b in self.0 {
|
||||
write!(f, "{b:02x}")?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
#[repr(packed)]
|
||||
struct UserHeader {
|
||||
pk: Pk,
|
||||
nonce: Nonce,
|
||||
post_count: u32,
|
||||
imports: u32,
|
||||
runs: u32,
|
||||
}
|
||||
#[cfg(test)]
|
||||
#[test]
|
||||
fn test_hex() {
|
||||
let expected = [1u8; 32];
|
||||
|
||||
#[repr(packed)]
|
||||
struct PostHeader {
|
||||
name: Postname,
|
||||
timestamp: u64,
|
||||
size: u32,
|
||||
offset: u32,
|
||||
imports: u32,
|
||||
runs: u32,
|
||||
let hex = dbg!(DisplayHex(expected).to_string());
|
||||
let got: [u8; 32] = hex_to_array(&hex).unwrap();
|
||||
|
||||
assert_eq!(got, expected);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue