]>
Commit | Line | Data |
---|---|---|
3e4311fe DC |
1 | use std::cmp::min; |
2 | use std::collections::HashMap; | |
3 | use std::ffi::{OsStr, OsString}; | |
4 | use std::io::{ErrorKind, Read, Result, Write}; | |
5 | use std::net::TcpStream; | |
6 | use std::os::unix::io::{AsRawFd, FromRawFd}; | |
7 | use std::os::unix::process::CommandExt; | |
8 | use std::process::Command; | |
9 | use std::time::{Duration, Instant}; | |
10 | ||
11 | use clap::{App, AppSettings, Arg}; | |
12 | use curl::easy::Easy; | |
13 | use mio::net::TcpListener; | |
14 | use mio::unix::{EventedFd, UnixReady}; | |
15 | use mio::{Events, Poll, PollOpt, Ready, Token}; | |
16 | ||
17 | use proxmox::sys::error::io_err_other; | |
18 | use proxmox::sys::linux::pty::{make_controlling_terminal, PTY}; | |
19 | use proxmox::tools::byte_buffer::ByteBuffer; | |
20 | use proxmox::{io_bail, io_format_err}; | |
21 | ||
22 | const MSG_TYPE_DATA: u8 = 0; | |
23 | const MSG_TYPE_RESIZE: u8 = 1; | |
24 | //const MSG_TYPE_PING: u8 = 2; | |
25 | ||
26 | fn remove_number(buf: &mut ByteBuffer) -> Option<usize> { | |
27 | loop { | |
28 | if let Some(pos) = &buf.iter().position(|&x| x == b':') { | |
29 | let data = buf.remove_data(*pos); | |
30 | buf.consume(1); // the ':' | |
31 | let len = match std::str::from_utf8(&data) { | |
32 | Ok(lenstring) => match lenstring.parse() { | |
33 | Ok(len) => len, | |
34 | Err(err) => { | |
35 | eprintln!("error parsing number: '{}'", err); | |
36 | break; | |
37 | } | |
38 | }, | |
39 | Err(err) => { | |
40 | eprintln!("error parsing number: '{}'", err); | |
41 | break; | |
42 | } | |
43 | }; | |
44 | return Some(len); | |
45 | } else if buf.len() > 20 { | |
46 | buf.consume(20); | |
47 | } else { | |
48 | break; | |
49 | } | |
50 | } | |
51 | None | |
52 | } | |
53 | ||
54 | fn process_queue(buf: &mut ByteBuffer, pty: &mut PTY) -> Option<usize> { | |
55 | if buf.is_empty() { | |
56 | return None; | |
57 | } | |
58 | ||
59 | loop { | |
60 | if buf.len() < 2 { | |
61 | break; | |
62 | } | |
63 | ||
64 | let msgtype = buf[0] - b'0'; | |
65 | ||
66 | if msgtype == MSG_TYPE_DATA { | |
67 | buf.consume(2); | |
68 | if let Some(len) = remove_number(buf) { | |
69 | return Some(len); | |
70 | } | |
71 | } else if msgtype == MSG_TYPE_RESIZE { | |
72 | buf.consume(2); | |
73 | if let Some(cols) = remove_number(buf) { | |
74 | if let Some(rows) = remove_number(buf) { | |
75 | pty.set_size(cols as u16, rows as u16).ok()?; | |
76 | } | |
77 | } | |
78 | // ignore incomplete messages | |
79 | } else { | |
80 | buf.consume(1); | |
81 | // ignore invalid or ping (msgtype 2) | |
82 | } | |
83 | } | |
84 | ||
85 | None | |
86 | } | |
87 | ||
88 | type TicketResult = Result<(Box<[u8]>, Box<[u8]>)>; | |
89 | ||
90 | /// Reads from the stream and returns the first line and the rest | |
91 | fn read_ticket_line( | |
92 | stream: &mut TcpStream, | |
93 | buf: &mut ByteBuffer, | |
94 | timeout: Duration, | |
95 | ) -> TicketResult { | |
96 | let now = Instant::now(); | |
97 | while !&buf[..].contains(&b'\n') { | |
98 | if buf.is_full() || now.elapsed() >= timeout { | |
99 | io_bail!("authentication data is incomplete: {:?}", &buf[..]); | |
100 | } | |
101 | stream.set_read_timeout(Some(Duration::new(1, 0)))?; | |
102 | match buf.read_from(stream) { | |
103 | Ok(n) => { | |
104 | if n == 0 { | |
105 | io_bail!("connection closed before authentication"); | |
106 | } | |
107 | } | |
108 | Err(err) if err.kind() == ErrorKind::WouldBlock => {} | |
109 | Err(err) => return Err(err), | |
110 | } | |
111 | } | |
112 | ||
113 | stream.set_read_timeout(None)?; | |
114 | let newline_idx = &buf[..].iter().position(|&x| x == b'\n').unwrap(); | |
115 | ||
116 | let line = buf.remove_data(*newline_idx); | |
117 | buf.consume(1); // discard newline | |
118 | ||
119 | match line.iter().position(|&b| b == b':') { | |
120 | Some(pos) => { | |
121 | let (username, ticket) = line.split_at(pos); | |
122 | Ok((username.into(), ticket[1..].into())) | |
123 | } | |
124 | None => io_bail!("authentication data is invalid"), | |
125 | } | |
126 | } | |
127 | ||
128 | fn authenticate( | |
129 | username: &[u8], | |
130 | ticket: &[u8], | |
131 | path: &str, | |
132 | perm: Option<&str>, | |
133 | authport: u16, | |
134 | port: Option<u16>, | |
135 | ) -> Result<()> { | |
136 | let mut curl = Easy::new(); | |
137 | curl.url(&format!( | |
138 | "http://localhost:{}/api2/json/access/ticket", | |
139 | authport | |
140 | ))?; | |
141 | ||
142 | let username = curl.url_encode(username); | |
143 | let ticket = curl.url_encode(ticket); | |
144 | let path = curl.url_encode(path.as_bytes()); | |
145 | ||
146 | let mut post_fields = Vec::with_capacity(5); | |
147 | post_fields.push(format!("username={}", username)); | |
148 | post_fields.push(format!("password={}", ticket)); | |
149 | post_fields.push(format!("path={}", path)); | |
150 | ||
151 | if let Some(perm) = perm { | |
152 | let perm = curl.url_encode(perm.as_bytes()); | |
153 | post_fields.push(format!("privs={}", perm)); | |
154 | } | |
155 | ||
156 | if let Some(port) = port { | |
157 | post_fields.push(format!("port={}", port)); | |
158 | } | |
159 | ||
160 | curl.post_fields_copy(post_fields.join("&").as_bytes())?; | |
161 | curl.post(true)?; | |
162 | curl.perform()?; | |
163 | ||
164 | let response_code = curl.response_code()?; | |
165 | ||
166 | if response_code != 200 { | |
167 | io_bail!("invalid authentication, code {}", response_code); | |
168 | } | |
169 | ||
170 | Ok(()) | |
171 | } | |
172 | ||
173 | fn listen_and_accept( | |
174 | hostname: &str, | |
175 | port: u64, | |
176 | port_as_fd: bool, | |
177 | timeout: Duration, | |
178 | ) -> Result<(TcpStream, u16)> { | |
179 | let listener = if port_as_fd { | |
180 | unsafe { std::net::TcpListener::from_raw_fd(port as i32) } | |
181 | } else { | |
182 | std::net::TcpListener::bind((hostname, port as u16))? | |
183 | }; | |
184 | let port = listener.local_addr()?.port(); | |
185 | let listener = TcpListener::from_std(listener)?; | |
186 | let poll = Poll::new()?; | |
187 | ||
188 | poll.register(&listener, Token(0), Ready::readable(), PollOpt::edge())?; | |
189 | ||
190 | let mut events = Events::with_capacity(1); | |
191 | ||
192 | let mut timeout = timeout; | |
193 | loop { | |
194 | let now = Instant::now(); | |
195 | poll.poll(&mut events, Some(timeout))?; | |
196 | let elapsed = now.elapsed(); | |
197 | if !events.is_empty() { | |
198 | let (stream, client) = listener.accept_std()?; | |
199 | println!("client connection: {:?}", client); | |
200 | return Ok((stream, port)); | |
201 | } | |
202 | if timeout >= elapsed { | |
203 | timeout -= elapsed; | |
204 | } else { | |
205 | io_bail!("timed out"); | |
206 | } | |
207 | } | |
208 | } | |
209 | ||
210 | fn run_pty(cmd: &OsStr, params: clap::OsValues) -> Result<PTY> { | |
211 | let (mut pty, secondary_name) = PTY::new().map_err(io_err_other)?; | |
212 | ||
213 | let mut filtered_env: HashMap<OsString, OsString> = std::env::vars_os() | |
214 | .filter(|&(ref k, _)| { | |
215 | k == "PATH" | |
216 | || k == "USER" | |
217 | || k == "HOME" | |
218 | || k == "LANG" | |
219 | || k == "LANGUAGE" | |
220 | || k.to_string_lossy().starts_with("LC_") | |
221 | }) | |
222 | .collect(); | |
223 | filtered_env.insert("TERM".into(), "xterm-256color".into()); | |
224 | ||
225 | let mut command = Command::new(cmd); | |
226 | ||
227 | command.args(params).env_clear().envs(&filtered_env); | |
228 | ||
229 | unsafe { | |
230 | command.pre_exec(move || { | |
231 | make_controlling_terminal(&secondary_name).map_err(io_err_other)?; | |
232 | Ok(()) | |
233 | }); | |
234 | } | |
235 | ||
236 | command.spawn()?; | |
237 | ||
238 | pty.set_size(80, 20).map_err(|x| x.as_errno().unwrap())?; | |
239 | Ok(pty) | |
240 | } | |
241 | ||
242 | const TCP: Token = Token(0); | |
243 | const PTY: Token = Token(1); | |
244 | ||
245 | fn do_main() -> Result<()> { | |
246 | let matches = App::new("termproxy") | |
247 | .setting(AppSettings::TrailingVarArg) | |
248 | .arg(Arg::with_name("port").takes_value(true).required(true)) | |
249 | .arg( | |
250 | Arg::with_name("authport") | |
251 | .takes_value(true) | |
252 | .long("authport"), | |
253 | ) | |
254 | .arg(Arg::with_name("use-port-as-fd").long("port-as-fd")) | |
255 | .arg( | |
256 | Arg::with_name("path") | |
257 | .takes_value(true) | |
258 | .long("path") | |
259 | .required(true), | |
260 | ) | |
261 | .arg(Arg::with_name("perm").takes_value(true).long("perm")) | |
262 | .arg(Arg::with_name("cmd").multiple(true).required(true)) | |
263 | .get_matches(); | |
264 | ||
265 | let port: u64 = matches | |
266 | .value_of("port") | |
267 | .unwrap() | |
268 | .parse() | |
269 | .map_err(io_err_other)?; | |
270 | let path = matches.value_of("path").unwrap(); | |
271 | let perm: Option<&str> = matches.value_of("perm"); | |
272 | let mut cmdparams = matches.values_of_os("cmd").unwrap(); | |
273 | let cmd = cmdparams.next().unwrap(); | |
274 | let authport: u16 = matches | |
275 | .value_of("authport") | |
276 | .unwrap_or("85") | |
277 | .parse() | |
278 | .map_err(io_err_other)?; | |
279 | let mut pty_buf = ByteBuffer::new(); | |
280 | let mut tcp_buf = ByteBuffer::new(); | |
281 | ||
282 | let use_port_as_fd = matches.is_present("use-port-as-fd"); | |
283 | ||
284 | if use_port_as_fd && port > u16::MAX as u64 { | |
285 | return Err(io_format_err!("port too big")); | |
286 | } else if port > i32::MAX as u64 { | |
287 | return Err(io_format_err!("Invalid FD number")); | |
288 | } | |
289 | ||
290 | let (mut stream, port) = | |
291 | listen_and_accept("localhost", port, use_port_as_fd, Duration::new(10, 0)) | |
292 | .map_err(|err| io_format_err!("failed waiting for client: {}", err))?; | |
293 | ||
294 | let (username, ticket) = read_ticket_line(&mut stream, &mut pty_buf, Duration::new(10, 0)) | |
295 | .map_err(|err| io_format_err!("failed reading ticket: {}", err))?; | |
296 | let port = if use_port_as_fd { Some(port) } else { None }; | |
297 | authenticate(&username, &ticket, path, perm, authport, port)?; | |
298 | stream.write_all(b"OK").expect("error writing response"); | |
299 | ||
300 | let mut tcp_handle = mio::net::TcpStream::from_stream(stream)?; | |
301 | ||
302 | let poll = Poll::new()?; | |
303 | let mut events = Events::with_capacity(128); | |
304 | ||
305 | let mut pty = run_pty(cmd, cmdparams)?; | |
306 | ||
307 | poll.register( | |
308 | &tcp_handle, | |
309 | TCP, | |
310 | Ready::readable() | Ready::writable() | UnixReady::hup(), | |
311 | PollOpt::edge(), | |
312 | )?; | |
313 | poll.register( | |
314 | &EventedFd(&pty.as_raw_fd()), | |
315 | PTY, | |
316 | Ready::readable() | Ready::writable() | UnixReady::hup(), | |
317 | PollOpt::edge(), | |
318 | )?; | |
319 | ||
320 | let mut tcp_writable = true; | |
321 | let mut pty_writable = true; | |
322 | let mut tcp_readable = true; | |
323 | let mut pty_readable = true; | |
324 | let mut remaining = 0; | |
325 | let mut finished = false; | |
326 | ||
327 | while !finished { | |
328 | if tcp_readable && !pty_buf.is_full() || pty_readable && !tcp_buf.is_full() { | |
329 | poll.poll(&mut events, Some(Duration::new(0, 0)))?; | |
330 | } else { | |
331 | poll.poll(&mut events, None)?; | |
332 | } | |
333 | ||
334 | for event in &events { | |
335 | let readiness = event.readiness(); | |
336 | let writable = readiness.is_writable(); | |
337 | let readable = readiness.is_readable(); | |
338 | if UnixReady::from(readiness).is_hup() { | |
339 | finished = true; | |
340 | } | |
341 | match event.token() { | |
342 | TCP => { | |
343 | if readable { | |
344 | tcp_readable = true; | |
345 | } | |
346 | if writable { | |
347 | tcp_writable = true; | |
348 | } | |
349 | } | |
350 | PTY => { | |
351 | if readable { | |
352 | pty_readable = true; | |
353 | } | |
354 | if writable { | |
355 | pty_writable = true; | |
356 | } | |
357 | } | |
358 | _ => unreachable!(), | |
359 | } | |
360 | } | |
361 | ||
362 | while tcp_readable && !pty_buf.is_full() { | |
363 | let bytes = match pty_buf.read_from(&mut tcp_handle) { | |
364 | Ok(bytes) => bytes, | |
365 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
366 | tcp_readable = false; | |
367 | break; | |
368 | } | |
369 | Err(err) => { | |
370 | if !finished { | |
371 | return Err(io_format_err!("error reading from tcp: {}", err)); | |
372 | } | |
373 | break; | |
374 | } | |
375 | }; | |
376 | if bytes == 0 { | |
377 | finished = true; | |
378 | break; | |
379 | } | |
380 | } | |
381 | ||
382 | while pty_readable && !tcp_buf.is_full() { | |
383 | let bytes = match tcp_buf.read_from(&mut pty) { | |
384 | Ok(bytes) => bytes, | |
385 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
386 | pty_readable = false; | |
387 | break; | |
388 | } | |
389 | Err(err) => { | |
390 | if !finished { | |
391 | return Err(io_format_err!("error reading from pty: {}", err)); | |
392 | } | |
393 | break; | |
394 | } | |
395 | }; | |
396 | if bytes == 0 { | |
397 | finished = true; | |
398 | break; | |
399 | } | |
400 | } | |
401 | ||
402 | while !tcp_buf.is_empty() && tcp_writable { | |
403 | let bytes = match tcp_handle.write(&tcp_buf[..]) { | |
404 | Ok(bytes) => bytes, | |
405 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
406 | tcp_writable = false; | |
407 | break; | |
408 | } | |
409 | Err(err) => { | |
410 | if !finished { | |
411 | return Err(io_format_err!("error writing to tcp : {}", err)); | |
412 | } | |
413 | break; | |
414 | } | |
415 | }; | |
416 | tcp_buf.consume(bytes); | |
417 | } | |
418 | ||
419 | while !pty_buf.is_empty() && pty_writable { | |
420 | if remaining == 0 { | |
421 | remaining = match process_queue(&mut pty_buf, &mut pty) { | |
422 | Some(val) => val, | |
423 | None => break, | |
424 | }; | |
425 | } | |
426 | let len = min(remaining, pty_buf.len()); | |
427 | let bytes = match pty.write(&pty_buf[..len]) { | |
428 | Ok(bytes) => bytes, | |
429 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
430 | pty_writable = false; | |
431 | break; | |
432 | } | |
433 | Err(err) => { | |
434 | if !finished { | |
435 | return Err(io_format_err!("error writing to pty : {}", err)); | |
436 | } | |
437 | break; | |
438 | } | |
439 | }; | |
440 | remaining -= bytes; | |
441 | pty_buf.consume(bytes); | |
442 | } | |
443 | } | |
444 | ||
445 | Ok(()) | |
446 | } | |
447 | ||
448 | fn main() { | |
449 | std::process::exit(match do_main() { | |
450 | Ok(_) => 0, | |
451 | Err(err) => { | |
452 | eprintln!("{}", err); | |
453 | 1 | |
454 | } | |
455 | }); | |
456 | } |