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Commit | Line | Data |
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3e4311fe DC |
1 | use std::cmp::min; |
2 | use std::collections::HashMap; | |
13e2e502 | 3 | use std::ffi::OsString; |
cfa75e79 | 4 | use std::io::{ErrorKind, Write}; |
3e4311fe DC |
5 | use std::os::unix::io::{AsRawFd, FromRawFd}; |
6 | use std::os::unix::process::CommandExt; | |
7 | use std::process::Command; | |
8 | use std::time::{Duration, Instant}; | |
9 | ||
cfa75e79 | 10 | use anyhow::{bail, format_err, Result}; |
13e2e502 | 11 | use clap::Arg; |
c2d63828 | 12 | use mio::net::{TcpListener, TcpStream}; |
c2d63828 | 13 | use mio::unix::SourceFd; |
3c586bd8 | 14 | use mio::{Events, Interest, Poll, Token}; |
3e4311fe | 15 | |
cc1dbda3 | 16 | use proxmox_io::ByteBuffer; |
27f74629 | 17 | use proxmox_lang::error::io_err_other; |
8c6783e9 | 18 | use proxmox_sys::linux::pty::{make_controlling_terminal, PTY}; |
3e4311fe DC |
19 | |
20 | const MSG_TYPE_DATA: u8 = 0; | |
21 | const MSG_TYPE_RESIZE: u8 = 1; | |
22 | //const MSG_TYPE_PING: u8 = 2; | |
23 | ||
24 | fn remove_number(buf: &mut ByteBuffer) -> Option<usize> { | |
25 | loop { | |
26 | if let Some(pos) = &buf.iter().position(|&x| x == b':') { | |
27 | let data = buf.remove_data(*pos); | |
28 | buf.consume(1); // the ':' | |
29 | let len = match std::str::from_utf8(&data) { | |
30 | Ok(lenstring) => match lenstring.parse() { | |
31 | Ok(len) => len, | |
32 | Err(err) => { | |
33 | eprintln!("error parsing number: '{}'", err); | |
34 | break; | |
35 | } | |
36 | }, | |
37 | Err(err) => { | |
38 | eprintln!("error parsing number: '{}'", err); | |
39 | break; | |
40 | } | |
41 | }; | |
42 | return Some(len); | |
43 | } else if buf.len() > 20 { | |
44 | buf.consume(20); | |
45 | } else { | |
46 | break; | |
47 | } | |
48 | } | |
49 | None | |
50 | } | |
51 | ||
52 | fn process_queue(buf: &mut ByteBuffer, pty: &mut PTY) -> Option<usize> { | |
53 | if buf.is_empty() { | |
54 | return None; | |
55 | } | |
56 | ||
57 | loop { | |
58 | if buf.len() < 2 { | |
59 | break; | |
60 | } | |
61 | ||
62 | let msgtype = buf[0] - b'0'; | |
63 | ||
64 | if msgtype == MSG_TYPE_DATA { | |
65 | buf.consume(2); | |
66 | if let Some(len) = remove_number(buf) { | |
67 | return Some(len); | |
68 | } | |
69 | } else if msgtype == MSG_TYPE_RESIZE { | |
70 | buf.consume(2); | |
71 | if let Some(cols) = remove_number(buf) { | |
72 | if let Some(rows) = remove_number(buf) { | |
73 | pty.set_size(cols as u16, rows as u16).ok()?; | |
74 | } | |
75 | } | |
76 | // ignore incomplete messages | |
77 | } else { | |
78 | buf.consume(1); | |
79 | // ignore invalid or ping (msgtype 2) | |
80 | } | |
81 | } | |
82 | ||
83 | None | |
84 | } | |
85 | ||
86 | type TicketResult = Result<(Box<[u8]>, Box<[u8]>)>; | |
87 | ||
88 | /// Reads from the stream and returns the first line and the rest | |
89 | fn read_ticket_line( | |
90 | stream: &mut TcpStream, | |
91 | buf: &mut ByteBuffer, | |
92 | timeout: Duration, | |
93 | ) -> TicketResult { | |
7739b7e8 | 94 | let mut poll = Poll::new()?; |
3c586bd8 FG |
95 | poll.registry() |
96 | .register(stream, Token(0), Interest::READABLE)?; | |
7739b7e8 | 97 | let mut events = Events::with_capacity(1); |
41f32a28 FG |
98 | |
99 | let now = Instant::now(); | |
100 | let mut elapsed = Duration::new(0, 0); | |
7739b7e8 DC |
101 | |
102 | loop { | |
41f32a28 | 103 | poll.poll(&mut events, Some(timeout - elapsed))?; |
7739b7e8 DC |
104 | if !events.is_empty() { |
105 | match buf.read_from(stream) { | |
106 | Ok(n) => { | |
107 | if n == 0 { | |
cfa75e79 | 108 | bail!("connection closed before authentication"); |
7739b7e8 | 109 | } |
3e4311fe | 110 | } |
7739b7e8 | 111 | Err(err) if err.kind() == ErrorKind::WouldBlock => {} |
cfa75e79 | 112 | Err(err) => return Err(err.into()), |
7739b7e8 DC |
113 | } |
114 | ||
115 | if buf[..].contains(&b'\n') { | |
116 | break; | |
117 | } | |
118 | ||
119 | if buf.is_full() { | |
cfa75e79 | 120 | bail!("authentication data is incomplete: {:?}", &buf[..]); |
3e4311fe | 121 | } |
7739b7e8 DC |
122 | } |
123 | ||
41f32a28 FG |
124 | elapsed = now.elapsed(); |
125 | if elapsed > timeout { | |
cfa75e79 | 126 | bail!("timed out"); |
3e4311fe DC |
127 | } |
128 | } | |
129 | ||
3e4311fe DC |
130 | let newline_idx = &buf[..].iter().position(|&x| x == b'\n').unwrap(); |
131 | ||
132 | let line = buf.remove_data(*newline_idx); | |
133 | buf.consume(1); // discard newline | |
134 | ||
135 | match line.iter().position(|&b| b == b':') { | |
136 | Some(pos) => { | |
137 | let (username, ticket) = line.split_at(pos); | |
138 | Ok((username.into(), ticket[1..].into())) | |
139 | } | |
cfa75e79 | 140 | None => bail!("authentication data is invalid"), |
3e4311fe DC |
141 | } |
142 | } | |
143 | ||
144 | fn authenticate( | |
145 | username: &[u8], | |
146 | ticket: &[u8], | |
147 | path: &str, | |
148 | perm: Option<&str>, | |
149 | authport: u16, | |
150 | port: Option<u16>, | |
151 | ) -> Result<()> { | |
81a288b9 TL |
152 | let mut post_fields: Vec<(&str, &str)> = Vec::with_capacity(5); |
153 | post_fields.push(("username", std::str::from_utf8(username)?)); | |
154 | post_fields.push(("password", std::str::from_utf8(ticket)?)); | |
155 | post_fields.push(("path", path)); | |
3e4311fe | 156 | if let Some(perm) = perm { |
81a288b9 | 157 | post_fields.push(("privs", perm)); |
3e4311fe | 158 | } |
81a288b9 | 159 | let port_str; |
3e4311fe | 160 | if let Some(port) = port { |
81a288b9 TL |
161 | port_str = port.to_string(); |
162 | post_fields.push(("port", &port_str)); | |
3e4311fe DC |
163 | } |
164 | ||
81a288b9 | 165 | let url = format!("http://localhost:{}/api2/json/access/ticket", authport); |
3e4311fe | 166 | |
81a288b9 TL |
167 | match ureq::post(&url).send_form(&post_fields[..]) { |
168 | Ok(res) if res.status() == 200 => Ok(()), | |
169 | Ok(res) | Err(ureq::Error::Status(_, res)) => { | |
170 | let code = res.status(); | |
171 | bail!("invalid authentication - {} {}", code, res.status_text()) | |
172 | } | |
173 | Err(err) => bail!("authentication request failed - {}", err), | |
3e4311fe | 174 | } |
3e4311fe DC |
175 | } |
176 | ||
177 | fn listen_and_accept( | |
178 | hostname: &str, | |
179 | port: u64, | |
180 | port_as_fd: bool, | |
181 | timeout: Duration, | |
182 | ) -> Result<(TcpStream, u16)> { | |
183 | let listener = if port_as_fd { | |
184 | unsafe { std::net::TcpListener::from_raw_fd(port as i32) } | |
185 | } else { | |
186 | std::net::TcpListener::bind((hostname, port as u16))? | |
187 | }; | |
188 | let port = listener.local_addr()?.port(); | |
c2d63828 DC |
189 | let mut listener = TcpListener::from_std(listener); |
190 | let mut poll = Poll::new()?; | |
3e4311fe | 191 | |
3c586bd8 FG |
192 | poll.registry() |
193 | .register(&mut listener, Token(0), Interest::READABLE)?; | |
3e4311fe DC |
194 | |
195 | let mut events = Events::with_capacity(1); | |
196 | ||
41f32a28 FG |
197 | let now = Instant::now(); |
198 | let mut elapsed = Duration::new(0, 0); | |
199 | ||
3e4311fe | 200 | loop { |
41f32a28 | 201 | poll.poll(&mut events, Some(timeout - elapsed))?; |
3e4311fe | 202 | if !events.is_empty() { |
c2d63828 | 203 | let (stream, client) = listener.accept()?; |
3e4311fe DC |
204 | println!("client connection: {:?}", client); |
205 | return Ok((stream, port)); | |
206 | } | |
41f32a28 FG |
207 | |
208 | elapsed = now.elapsed(); | |
209 | if elapsed > timeout { | |
cfa75e79 | 210 | bail!("timed out"); |
3e4311fe DC |
211 | } |
212 | } | |
213 | } | |
214 | ||
13e2e502 TL |
215 | fn run_pty<'a>(mut full_cmd: impl Iterator<Item = &'a OsString>) -> Result<PTY> { |
216 | let cmd_exe = full_cmd.next().unwrap(); | |
217 | let params = full_cmd; // rest | |
218 | ||
3e4311fe DC |
219 | let (mut pty, secondary_name) = PTY::new().map_err(io_err_other)?; |
220 | ||
221 | let mut filtered_env: HashMap<OsString, OsString> = std::env::vars_os() | |
222 | .filter(|&(ref k, _)| { | |
223 | k == "PATH" | |
224 | || k == "USER" | |
225 | || k == "HOME" | |
226 | || k == "LANG" | |
227 | || k == "LANGUAGE" | |
228 | || k.to_string_lossy().starts_with("LC_") | |
229 | }) | |
230 | .collect(); | |
231 | filtered_env.insert("TERM".into(), "xterm-256color".into()); | |
232 | ||
13e2e502 | 233 | let mut command = Command::new(cmd_exe); |
3e4311fe DC |
234 | |
235 | command.args(params).env_clear().envs(&filtered_env); | |
236 | ||
237 | unsafe { | |
238 | command.pre_exec(move || { | |
239 | make_controlling_terminal(&secondary_name).map_err(io_err_other)?; | |
240 | Ok(()) | |
241 | }); | |
242 | } | |
243 | ||
244 | command.spawn()?; | |
245 | ||
27f74629 | 246 | pty.set_size(80, 20)?; |
3e4311fe DC |
247 | Ok(pty) |
248 | } | |
249 | ||
250 | const TCP: Token = Token(0); | |
251 | const PTY: Token = Token(1); | |
252 | ||
253 | fn do_main() -> Result<()> { | |
13e2e502 TL |
254 | let matches = clap::builder::Command::new("termproxy") |
255 | .trailing_var_arg(true) | |
3e4311fe | 256 | .arg( |
13e2e502 TL |
257 | Arg::new("port") |
258 | .num_args(1) | |
259 | .required(true) | |
260 | .value_parser(clap::value_parser!(u64)), | |
3e4311fe | 261 | ) |
13e2e502 TL |
262 | .arg(Arg::new("authport").num_args(1).long("authport")) |
263 | .arg(Arg::new("use-port-as-fd").long("port-as-fd")) | |
264 | .arg(Arg::new("path").num_args(1).long("path").required(true)) | |
265 | .arg(Arg::new("perm").num_args(1).long("perm")) | |
3e4311fe | 266 | .arg( |
13e2e502 TL |
267 | Arg::new("cmd") |
268 | .value_parser(clap::value_parser!(OsString)) | |
269 | .num_args(1..) | |
8c6783e9 DC |
270 | .required(true), |
271 | ) | |
3e4311fe DC |
272 | .get_matches(); |
273 | ||
13e2e502 TL |
274 | let port: u64 = *matches.get_one("port").unwrap(); |
275 | let path = matches.get_one::<String>("path").unwrap(); | |
276 | let perm = matches.get_one::<String>("perm").map(|x| x.as_str()); | |
277 | let full_cmd: clap::parser::ValuesRef<OsString> = matches.get_many("cmd").unwrap(); | |
278 | let authport: u16 = *matches.get_one("authport").unwrap_or(&85); | |
279 | let use_port_as_fd = matches.contains_id("use-port-as-fd"); | |
3e4311fe DC |
280 | |
281 | if use_port_as_fd && port > u16::MAX as u64 { | |
cfa75e79 | 282 | return Err(format_err!("port too big")); |
3e4311fe | 283 | } else if port > i32::MAX as u64 { |
cfa75e79 | 284 | return Err(format_err!("Invalid FD number")); |
3e4311fe DC |
285 | } |
286 | ||
c2d63828 | 287 | let (mut tcp_handle, port) = |
3e4311fe | 288 | listen_and_accept("localhost", port, use_port_as_fd, Duration::new(10, 0)) |
cfa75e79 | 289 | .map_err(|err| format_err!("failed waiting for client: {}", err))?; |
3e4311fe | 290 | |
13e2e502 TL |
291 | let mut pty_buf = ByteBuffer::new(); |
292 | let mut tcp_buf = ByteBuffer::new(); | |
293 | ||
c2d63828 | 294 | let (username, ticket) = read_ticket_line(&mut tcp_handle, &mut pty_buf, Duration::new(10, 0)) |
cfa75e79 | 295 | .map_err(|err| format_err!("failed reading ticket: {}", err))?; |
3e4311fe | 296 | let port = if use_port_as_fd { Some(port) } else { None }; |
13e2e502 | 297 | authenticate(&username, &ticket, &path, perm.as_deref(), authport, port)?; |
c2d63828 | 298 | tcp_handle.write_all(b"OK").expect("error writing response"); |
3e4311fe | 299 | |
c2d63828 | 300 | let mut poll = Poll::new()?; |
3e4311fe DC |
301 | let mut events = Events::with_capacity(128); |
302 | ||
13e2e502 | 303 | let mut pty = run_pty(full_cmd)?; |
3e4311fe | 304 | |
c2d63828 DC |
305 | poll.registry().register( |
306 | &mut tcp_handle, | |
3e4311fe | 307 | TCP, |
bb32b0c6 | 308 | Interest::READABLE | Interest::WRITABLE, |
3e4311fe | 309 | )?; |
c2d63828 DC |
310 | poll.registry().register( |
311 | &mut SourceFd(&pty.as_raw_fd()), | |
3e4311fe | 312 | PTY, |
bb32b0c6 | 313 | Interest::READABLE | Interest::WRITABLE, |
3e4311fe DC |
314 | )?; |
315 | ||
316 | let mut tcp_writable = true; | |
317 | let mut pty_writable = true; | |
318 | let mut tcp_readable = true; | |
319 | let mut pty_readable = true; | |
320 | let mut remaining = 0; | |
321 | let mut finished = false; | |
322 | ||
323 | while !finished { | |
324 | if tcp_readable && !pty_buf.is_full() || pty_readable && !tcp_buf.is_full() { | |
325 | poll.poll(&mut events, Some(Duration::new(0, 0)))?; | |
326 | } else { | |
327 | poll.poll(&mut events, None)?; | |
328 | } | |
329 | ||
330 | for event in &events { | |
c2d63828 DC |
331 | let writable = event.is_writable(); |
332 | let readable = event.is_readable(); | |
333 | if event.is_read_closed() { | |
3e4311fe DC |
334 | finished = true; |
335 | } | |
336 | match event.token() { | |
337 | TCP => { | |
338 | if readable { | |
339 | tcp_readable = true; | |
340 | } | |
341 | if writable { | |
342 | tcp_writable = true; | |
343 | } | |
344 | } | |
345 | PTY => { | |
346 | if readable { | |
347 | pty_readable = true; | |
348 | } | |
349 | if writable { | |
350 | pty_writable = true; | |
351 | } | |
352 | } | |
353 | _ => unreachable!(), | |
354 | } | |
355 | } | |
356 | ||
357 | while tcp_readable && !pty_buf.is_full() { | |
358 | let bytes = match pty_buf.read_from(&mut tcp_handle) { | |
359 | Ok(bytes) => bytes, | |
360 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
361 | tcp_readable = false; | |
362 | break; | |
363 | } | |
364 | Err(err) => { | |
365 | if !finished { | |
cfa75e79 | 366 | return Err(format_err!("error reading from tcp: {}", err)); |
3e4311fe DC |
367 | } |
368 | break; | |
369 | } | |
370 | }; | |
371 | if bytes == 0 { | |
372 | finished = true; | |
373 | break; | |
374 | } | |
375 | } | |
376 | ||
377 | while pty_readable && !tcp_buf.is_full() { | |
378 | let bytes = match tcp_buf.read_from(&mut pty) { | |
379 | Ok(bytes) => bytes, | |
380 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
381 | pty_readable = false; | |
382 | break; | |
383 | } | |
384 | Err(err) => { | |
385 | if !finished { | |
cfa75e79 | 386 | return Err(format_err!("error reading from pty: {}", err)); |
3e4311fe DC |
387 | } |
388 | break; | |
389 | } | |
390 | }; | |
391 | if bytes == 0 { | |
392 | finished = true; | |
393 | break; | |
394 | } | |
395 | } | |
396 | ||
397 | while !tcp_buf.is_empty() && tcp_writable { | |
398 | let bytes = match tcp_handle.write(&tcp_buf[..]) { | |
399 | Ok(bytes) => bytes, | |
400 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
401 | tcp_writable = false; | |
402 | break; | |
403 | } | |
404 | Err(err) => { | |
405 | if !finished { | |
cfa75e79 | 406 | return Err(format_err!("error writing to tcp : {}", err)); |
3e4311fe DC |
407 | } |
408 | break; | |
409 | } | |
410 | }; | |
411 | tcp_buf.consume(bytes); | |
412 | } | |
413 | ||
414 | while !pty_buf.is_empty() && pty_writable { | |
415 | if remaining == 0 { | |
416 | remaining = match process_queue(&mut pty_buf, &mut pty) { | |
417 | Some(val) => val, | |
418 | None => break, | |
419 | }; | |
420 | } | |
421 | let len = min(remaining, pty_buf.len()); | |
422 | let bytes = match pty.write(&pty_buf[..len]) { | |
423 | Ok(bytes) => bytes, | |
424 | Err(err) if err.kind() == ErrorKind::WouldBlock => { | |
425 | pty_writable = false; | |
426 | break; | |
427 | } | |
428 | Err(err) => { | |
429 | if !finished { | |
cfa75e79 | 430 | return Err(format_err!("error writing to pty : {}", err)); |
3e4311fe DC |
431 | } |
432 | break; | |
433 | } | |
434 | }; | |
435 | remaining -= bytes; | |
436 | pty_buf.consume(bytes); | |
437 | } | |
438 | } | |
439 | ||
440 | Ok(()) | |
441 | } | |
442 | ||
443 | fn main() { | |
444 | std::process::exit(match do_main() { | |
445 | Ok(_) => 0, | |
446 | Err(err) => { | |
447 | eprintln!("{}", err); | |
448 | 1 | |
449 | } | |
450 | }); | |
451 | } |