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#![deny(warnings)]
#![warn(unused_must_use)]
extern crate secstr;
mod assuan;
use std::error;
use std::ffi::OsStr;
use std::fmt::{Display, Formatter};
use std::io;
use std::io::{BufRead, BufReader};
use std::process::{Child, Command, Stdio};
use std::result;
use secstr::SecStr;
use assuan::{AssuanCommand, AssuanResponse, Button};
pub type Result<T> = result::Result<T, Error>;
#[derive(Debug)]
pub enum Error {
IoError(io::Error),
ProtocolError(String),
}
impl From<io::Error> for Error {
fn from(e: io::Error) -> Self {
Error::IoError(e)
}
}
impl Display for Error {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self {
Error::IoError(ref cause) => write!(f, "Pinentry I/O error: {}", cause),
Error::ProtocolError(ref cause) => write!(f, "A pinentry protocol error has occurred: {}", cause),
}
}
}
impl error::Error for Error {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self {
Error::IoError(ref cause) => Some(cause),
_ => None,
}
}
}
pub fn pinentry() -> PinentryBuilder {
PinentryBuilder::default()
}
pub struct PinentryBuilder {
description: Option<String>,
error_text: Option<String>,
exe: String,
label_cancel: Option<String>,
label_notok: Option<String>,
label_ok: Option<String>,
timeout: Option<u32>,
window_title: Option<String>,
}
impl PinentryBuilder {
pub fn description(mut self, desc: String) -> Self {
self.description = Some(desc);
self
}
pub fn error_text(mut self, error_text: String) -> Self {
self.error_text = Some(error_text);
self
}
pub fn exe(mut self, exe: String) -> Self {
self.exe = exe;
self
}
pub fn label_cancel(mut self, label: String) -> Self {
self.label_cancel = Some(label);
self
}
pub fn label_notok(mut self, label: String) -> Self {
self.label_notok = Some(label);
self
}
pub fn label_ok(mut self, label: String) -> Self {
self.label_ok = Some(label);
self
}
pub fn timeout(mut self, secs: u32) -> Self {
self.timeout = Some(secs);
self
}
pub fn window_title(mut self, title: String) -> Self {
self.window_title = Some(title);
self
}
pub fn confirm_yes_no(mut self) -> Result<bool> {
let mut commands = self.build_commands();
commands.push(AssuanCommand::Confirm);
let pinentry = start_pinentry(&self.exe)?;
let res = process_commands(pinentry, &commands)?;
match res {
AssuanResponse::OK => Ok(true),
AssuanResponse::NOTOK(_) => Ok(false),
x => panic!("BUG: unexpected response {:?}", x),
}
}
pub fn pin(mut self, prompt: String) -> Result<SecStr> {
let mut commands = self.build_commands();
commands.push(AssuanCommand::SetPrompt(prompt));
commands.push(AssuanCommand::GetPin);
let pinentry = start_pinentry(&self.exe)?;
let res = process_commands(pinentry, &commands)?;
match res {
AssuanResponse::PIN(pin) => Ok(pin),
AssuanResponse::NOTOK(error) => Err(Error::ProtocolError(error)),
AssuanResponse::OK => panic!("BUG: got OK result but asked for PIN"),
}
}
pub fn show_message(mut self) -> Result<()> {
let mut commands = self.build_commands();
commands.push(AssuanCommand::ShowMessage);
let pinentry = start_pinentry(&self.exe)?;
let res = process_commands(pinentry, &commands)?;
match res {
AssuanResponse::OK => Ok(()),
x => panic!("BUG: unexpected response {:?}", x),
}
}
fn build_commands(&mut self) -> Vec<AssuanCommand> {
let mut cmds = Vec::new();
if let Some(desc) = self.description.take() {
cmds.push(AssuanCommand::SetDescriptiveText(desc));
}
if let Some(text) = self.error_text.take() {
cmds.push(AssuanCommand::SetErrorText(text));
}
if let Some(cancel_label) = self.label_cancel.take() {
cmds.push(AssuanCommand::SetButtonLabel(Button::CANCEL, cancel_label));
}
if let Some(notok_label) = self.label_notok.take() {
cmds.push(AssuanCommand::SetButtonLabel(Button::NOTOK, notok_label));
}
if let Some(ok_label) = self.label_ok.take() {
cmds.push(AssuanCommand::SetButtonLabel(Button::OK, ok_label));
}
if let Some(timeout) = self.timeout {
cmds.push(AssuanCommand::SetTimeout(timeout));
}
if let Some(title) = self.window_title.take() {
cmds.push(AssuanCommand::SetWindowTitle(title));
}
cmds
}
}
impl Default for PinentryBuilder {
fn default() -> Self {
PinentryBuilder {
description: None,
error_text: None,
exe: "pinentry".to_string(),
label_cancel: None,
label_notok: None,
label_ok: None,
timeout: None,
window_title: None,
}
}
}
fn start_pinentry<S: AsRef<OsStr>>(exe: S) -> Result<Child> {
let mut pinentry = Command::new(exe)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()
.expect("failed to execute pinentry");
{
let stdout = pinentry.stdout.as_mut().expect("failed to get stdout");
let mut reader = BufReader::new(stdout);
let mut line = String::with_capacity(32);
let _ = reader.read_line(&mut line)?;
if !line.starts_with("OK") {
return Err(Error::ProtocolError(line));
}
}
Ok(pinentry)
}
fn process_commands(mut pinentry: Child, cmds: &[AssuanCommand]) -> Result<AssuanResponse> {
let res = {
let mut stdout = BufReader::new(pinentry.stdout.as_mut().expect("failed to get stdout"));
let stdin = pinentry.stdin.as_mut().expect("failed to get stdin");
assuan::process_commands(cmds.iter(), stdin, &mut stdout)?
};
pinentry.kill()?;
Ok(res)
}