215 lines
6.5 KiB
Rust
215 lines
6.5 KiB
Rust
use std::fs::{OpenOptions, File, create_dir_all};
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use std::io::Write;
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use std::path::Path;
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use std::pin::Pin;
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use std::str::FromStr;
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use std::sync::Arc;
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use chrono::Utc;
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use futures::FutureExt;
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use log::info;
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use russh::server::{Auth, Session};
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use russh::*;
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#[tokio::main]
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async fn main() {
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env_logger::builder()
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.filter_level(log::LevelFilter::Info)
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.init();
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let listen_addr = std::env::args().skip(1).next()
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.expect("Expecting <addr:port>");
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let mut config = russh::server::Config::default();
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config.auth_banner = Some("#
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# DEMONSTRATION SYSTEM
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#
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# All input will be published
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#
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");
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config.connection_timeout = Some(std::time::Duration::from_secs(10000));
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config.auth_rejection_time = std::time::Duration::from_secs(1);
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config.keys.push(russh_keys::key::KeyPair::generate_ed25519().unwrap());
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let config = Arc::new(config);
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let sh = Server;
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russh::server::run(
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config,
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&std::net::SocketAddr::from_str(&listen_addr).unwrap(),
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sh,
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)
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.await
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.unwrap();
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}
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struct Server;
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impl server::Server for Server {
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type Handler = Handler;
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fn new_client(&mut self, addr: Option<std::net::SocketAddr>) -> Handler {
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let addr = if let Some(addr) = addr {
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format!("{}", addr)
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} else {
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format!("unknown")
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};
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info!("Connection from {}", addr);
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let path = &format!(
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"{}-{}.txt",
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Utc::now().format("%Y-%m-%d/%H:%M:%S"),
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addr
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);
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let path = Path::new(path);
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create_dir_all(path.parent().unwrap()).unwrap();
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Handler {
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filename: path.display().to_string(),
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lazy_file: None,
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buffer: vec![],
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user: "root".into(),
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}
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}
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}
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fn send_str(session: &mut Session, channel: ChannelId, s: String) {
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let data = CryptoVec::from(s);
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session.data(channel, data);
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}
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struct Handler {
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filename: String,
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lazy_file: Option<File>,
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buffer: Vec<u8>,
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user: String,
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}
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impl Handler {
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fn file(&mut self) -> &mut File {
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if self.lazy_file.is_none() {
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let file = OpenOptions::new()
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.create(true)
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.append(true)
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.open(&self.filename)
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.unwrap();
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self.lazy_file = Some(file);
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}
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self.lazy_file.as_mut().unwrap()
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}
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fn send_prompt(&self, session: &mut Session, channel: ChannelId) {
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send_str(session, channel, format!("{}@fnordister:~$ ", self.user));
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}
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fn handle_command<F: FnMut(&str)>(&self, command: String, mut respond: F) {
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let program_len = command.find(|c: char| c.is_whitespace())
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.unwrap_or(command.len());
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let program = &command[..program_len];
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match program {
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"whoami" => respond(&self.user),
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"id" => respond(&format!("uid=0({}) gid=0(root)", self.user)),
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"uname" => respond("Linux fnordister 5.10.0-10-amd64 #1 SMP Debian 5.10.84-1 (2021-12-08) x86_64 GNU/Linux"),
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"pwd" => respond("/"),
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"ls" => {
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respond("drwxr-xr-x 18 root root 18 Jan 4 1969 .");
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respond("drwxr-xr-x 18 root root 18 Jan 4 1969 ..");
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respond("drwxr-xr-x 18 root root 18 Jan 4 0000 ...");
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},
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"bash" => {}
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"sh" => {}
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"cd" => {}
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"" => {}
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_ => respond(&format!("{}: command not found", program)),
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}
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}
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}
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impl server::Handler for Handler {
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type Error = anyhow::Error;
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type FutureAuth =
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Pin<Box<dyn core::future::Future<Output = anyhow::Result<(Self, Auth)>> + Send>>;
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type FutureUnit =
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Pin<Box<dyn core::future::Future<Output = anyhow::Result<(Self, Session)>> + Send>>;
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type FutureBool =
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Pin<Box<dyn core::future::Future<Output = anyhow::Result<(Self, Session, bool)>> + Send>>;
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fn finished_auth(self, auth: Auth) -> Self::FutureAuth {
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async { Ok((self, auth)) }.boxed()
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}
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fn finished_bool(self, b: bool, s: Session) -> Self::FutureBool {
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async move { Ok((self, s, b)) }.boxed()
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}
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fn finished(self, s: Session) -> Self::FutureUnit {
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async { Ok((self, s)) }.boxed()
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}
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fn shell_request(self, channel: ChannelId, mut session: Session) -> Self::FutureUnit {
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info!("shell_request");
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self.send_prompt(&mut session, channel);
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self.finished(session)
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}
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fn exec_request(mut self, channel: ChannelId, data: &[u8], mut session: Session) -> Self::FutureUnit {
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info!("exec_request");
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writeln!(self.file(), "Execute: {}\n", String::from_utf8_lossy(data))
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.unwrap();
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let line = String::from_utf8_lossy(data).into();
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self.handle_command(line, |response| {
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let mut data = Vec::from(response);
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data.extend_from_slice(b"\r\n");
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session.data(channel, data.into());
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});
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session.close(channel);
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self.finished(session)
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}
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fn subsystem_request(
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mut self,
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_channel: ChannelId,
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name: &str,
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session: Session
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) -> Self::FutureUnit {
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info!("subsystem_request");
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writeln!(self.file(), "Subsystem requested: {}\n", name)
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.unwrap();
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self.finished(session)
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}
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fn auth_password(mut self, user: &str, password: &str) -> Self::FutureAuth {
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writeln!(self.file(), "Authenticated as {} with {}\n", user, password)
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.unwrap();
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self.user = user.into();
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self.finished_auth(server::Auth::Accept)
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}
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fn data(mut self, channel: ChannelId, data: &[u8], mut session: Session) -> Self::FutureUnit {
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self.file().write(data)
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.unwrap();
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// echo input back
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session.data(channel, data.to_vec().into());
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if self.buffer.len() < 1024 {
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self.buffer.extend_from_slice(data);
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}
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if let Some(newline) = self.buffer.iter().position(|b| *b == b'\r') {
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let rest = self.buffer.split_off(newline + 1);
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let line: String = String::from_utf8_lossy(&self.buffer).into();
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self.buffer = rest;
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session.data(channel, b"\n".to_vec().into());
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self.handle_command(line, |response| {
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let mut data = Vec::from(response);
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data.extend_from_slice(b"\r\n");
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session.data(channel, data.into());
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});
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self.send_prompt(&mut session, channel);
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}
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self.finished(session)
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}
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}
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