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|
use crate::prelude::*;
use std::convert::TryFrom as _;
use tokio::io::AsyncWriteExt as _;
pub async fn getpin(
pinentry: &str,
prompt: &str,
desc: &str,
err: Option<&str>,
tty: Option<&str>,
grab: bool,
) -> Result<crate::locked::Password> {
let mut opts = tokio::process::Command::new(pinentry);
opts.stdin(std::process::Stdio::piped())
.stdout(std::process::Stdio::piped());
let mut args = vec!["-o", "0"];
if let Some(tty) = tty {
args.extend(&["-T", tty]);
}
if !grab {
args.push("-g");
}
opts.args(args);
let mut child = opts.spawn().map_err(|source| Error::Spawn { source })?;
// unwrap is safe because we specified stdin as piped in the command opts
// above
let mut stdin = child.stdin.take().unwrap();
let mut ncommands = 1;
stdin
.write_all(b"SETTITLE rbw\n")
.await
.map_err(|source| Error::WriteStdin { source })?;
ncommands += 1;
stdin
.write_all(format!("SETPROMPT {prompt}\n").as_bytes())
.await
.map_err(|source| Error::WriteStdin { source })?;
ncommands += 1;
stdin
.write_all(format!("SETDESC {desc}\n").as_bytes())
.await
.map_err(|source| Error::WriteStdin { source })?;
ncommands += 1;
if let Some(err) = err {
stdin
.write_all(format!("SETERROR {err}\n").as_bytes())
.await
.map_err(|source| Error::WriteStdin { source })?;
ncommands += 1;
}
stdin
.write_all(b"GETPIN\n")
.await
.map_err(|source| Error::WriteStdin { source })?;
ncommands += 1;
drop(stdin);
let mut buf = crate::locked::Vec::new();
buf.zero();
// unwrap is safe because we specified stdout as piped in the command opts
// above
let len = read_password(
ncommands,
buf.data_mut(),
child.stdout.as_mut().unwrap(),
)
.await?;
buf.truncate(len);
child
.wait()
.await
.map_err(|source| Error::PinentryWait { source })?;
Ok(crate::locked::Password::new(buf))
}
async fn read_password<R>(
mut ncommands: u8,
data: &mut [u8],
mut r: R,
) -> Result<usize>
where
R: tokio::io::AsyncRead + tokio::io::AsyncReadExt + Unpin + Send,
{
let mut len = 0;
loop {
let nl = data.iter().take(len).position(|c| *c == b'\n');
if let Some(nl) = nl {
if data.starts_with(b"OK") {
if ncommands == 1 {
len = 0;
break;
}
data.copy_within((nl + 1).., 0);
len -= nl + 1;
ncommands -= 1;
} else if data.starts_with(b"D ") {
data.copy_within(2..nl, 0);
len = nl - 2;
break;
} else if data.starts_with(b"ERR ") {
let line: Vec<u8> = data.iter().take(nl).copied().collect();
let line = String::from_utf8(line).unwrap();
let mut split = line.splitn(3, ' ');
let _ = split.next(); // ERR
let code = split.next();
match code {
Some("83886179") => {
return Err(Error::PinentryCancelled);
}
Some(code) => {
if let Some(error) = split.next() {
return Err(Error::PinentryErrorMessage {
error: error.to_string(),
});
}
return Err(Error::PinentryErrorMessage {
error: format!("unknown error ({code})"),
});
}
None => {
return Err(Error::PinentryErrorMessage {
error: "unknown error".to_string(),
});
}
}
} else {
return Err(Error::FailedToParsePinentry {
out: String::from_utf8_lossy(data).to_string(),
});
}
} else {
let bytes = r
.read(&mut data[len..])
.await
.map_err(|source| Error::PinentryReadOutput { source })?;
if bytes == 0 {
return Err(Error::PinentryReadOutput {
source: std::io::Error::new(
std::io::ErrorKind::UnexpectedEof,
"unexpected EOF",
),
});
}
len += bytes;
}
}
len = percent_decode(&mut data[..len]);
Ok(len)
}
// not using the percent-encoding crate because it doesn't provide a way to do
// this in-place, and we want the password to always live within the locked
// vec. should really move something like this into the percent-encoding crate
// at some point.
fn percent_decode(buf: &mut [u8]) -> usize {
let mut read_idx = 0;
let mut write_idx = 0;
let len = buf.len();
while read_idx < len {
let mut c = buf[read_idx];
if c == b'%' && read_idx + 2 < len {
if let Some(h) = char::from(buf[read_idx + 1]).to_digit(16) {
if let Some(l) = char::from(buf[read_idx + 2]).to_digit(16) {
// h and l were parsed from a single hex digit, so they
// must be in the range 0-15, so these unwraps are safe
c = u8::try_from(h).unwrap() * 0x10
+ u8::try_from(l).unwrap();
read_idx += 2;
}
}
}
buf[write_idx] = c;
read_idx += 1;
write_idx += 1;
}
write_idx
}
#[test]
fn test_read_password() {
let good_inputs = &[
(0, &b"D super secret password\n"[..]),
(4, &b"OK\nOK\nOK\nD super secret password\nOK\n"[..]),
(12, &b"OK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nD super secret password\nOK\n"[..]),
(24, &b"OK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nOK\nD super secret password\nOK\n"[..]),
];
for (ncommands, input) in good_inputs {
let mut buf = [0; 64];
tokio::runtime::Runtime::new().unwrap().block_on(async {
let len = read_password(*ncommands, &mut buf, &input[..])
.await
.unwrap();
assert_eq!(&buf[0..len], b"super secret password");
});
}
let match_inputs = &[
(&b"OK\nOK\nOK\nOK\n"[..], &b""[..]),
(&b"D foo%25bar\n"[..], &b"foo%bar"[..]),
(&b"D foo%0abar\n"[..], &b"foo\nbar"[..]),
(&b"D foo%0Abar\n"[..], &b"foo\nbar"[..]),
(&b"D foo%0Gbar\n"[..], &b"foo%0Gbar"[..]),
(&b"D foo%0\n"[..], &b"foo%0"[..]),
(&b"D foo%\n"[..], &b"foo%"[..]),
(&b"D %25foo\n"[..], &b"%foo"[..]),
(&b"D %25\n"[..], &b"%"[..]),
];
for (input, output) in match_inputs {
let mut buf = [0; 64];
tokio::runtime::Runtime::new().unwrap().block_on(async {
let len = read_password(4, &mut buf, &input[..]).await.unwrap();
assert_eq!(&buf[0..len], &output[..]);
});
}
}
|
