use crate::acceptor::AcmeAcceptor;
use crate::acme::{Account, AcmeError, Auth, Directory, Identifier, Order};
use crate::{AcmeConfig, Incoming, ResolvesServerCertAcme};
use async_io::Timer;
use chrono::{DateTime, TimeZone, Utc};
use futures::future::try_join_all;
use futures::prelude::*;
use futures::ready;
use pin_project::pin_project;
use rcgen::{CertificateParams, DistinguishedName, RcgenError, PKCS_ECDSA_P256_SHA256};
use rustls::sign::{any_ecdsa_type, CertifiedKey};
use rustls::Certificate as RustlsCertificate;
use rustls::PrivateKey;
use std::convert::Infallible;
use std::fmt::Debug;
use std::future::Future;
use std::ops::Div;
use std::pin::Pin;
use std::sync::Arc;
use std::task::{Context, Poll};
use std::time::Duration;
use thiserror::Error;
use x509_parser::parse_x509_certificate;
#[pin_project()]
pub struct AcmeState<EC: Debug = Infallible, EA: Debug = EC> {
config: Arc<AcmeConfig<EC, EA>>,
resolver: Arc<ResolvesServerCertAcme>,
account_key: Option<Vec<u8>>,
early_action: Option<Pin<Box<dyn Future<Output = Event<EC, EA>> + Send>>>,
load_cert: Option<Pin<Box<dyn Future<Output = Result<Option<Vec<u8>>, EC>> + Send>>>,
load_account: Option<Pin<Box<dyn Future<Output = Result<Option<Vec<u8>>, EA>> + Send>>>,
order: Option<Pin<Box<dyn Future<Output = Result<Vec<u8>, OrderError>> + Send>>>,
valid_until: chrono::DateTime<Utc>,
backoff_cnt: usize,
wait: Option<Timer>,
}
pub type Event<EC, EA> = Result<EventOk, EventError<EC, EA>>;
#[derive(Debug)]
pub enum EventOk {
DeployedCachedCert,
DeployedNewCert,
CertCacheStore,
AccountCacheStore,
}
#[derive(Error, Debug)]
pub enum EventError<EC: Debug, EA: Debug> {
#[error("cert cache load: {0}")]
CertCacheLoad(EC),
#[error("account cache load: {0}")]
AccountCacheLoad(EA),
#[error("cert cache store: {0}")]
CertCacheStore(EC),
#[error("account cache store: {0}")]
AccountCacheStore(EA),
#[error("cached cert parse: {0}")]
CachedCertParse(CertParseError),
#[error("order: {0}")]
Order(OrderError),
#[error("new cert parse: {0}")]
NewCertParse(CertParseError),
}
#[derive(Error, Debug)]
pub enum OrderError {
#[error("acme error: {0}")]
Acme(#[from] AcmeError),
#[error("certificate generation error: {0}")]
Rcgen(#[from] RcgenError),
#[error("bad order object: {0:?}")]
BadOrder(Order),
#[error("bad auth object: {0:?}")]
BadAuth(Auth),
#[error("authorization for {0} failed too many times")]
TooManyAttemptsAuth(String),
}
#[derive(Error, Debug)]
pub enum CertParseError {
#[error("X509 parsing error: {0}")]
X509(#[from] x509_parser::nom::Err<x509_parser::error::X509Error>),
#[error("expected 2 or more pem, got: {0}")]
Pem(#[from] pem::PemError),
#[error("expected 2 or more pem, got: {0}")]
TooFewPem(usize),
#[error("unsupported private key type")]
InvalidPrivateKey,
}
impl<EC: 'static + Debug, EA: 'static + Debug> AcmeState<EC, EA> {
pub fn incoming<
TCP: AsyncRead + AsyncWrite + Unpin,
ETCP,
ITCP: Stream<Item = Result<TCP, ETCP>>,
>(
self,
tcp_incoming: ITCP,
) -> Incoming<TCP, ETCP, ITCP, EC, EA> {
let acceptor = self.acceptor();
Incoming::new(tcp_incoming, self, acceptor)
}
pub fn acceptor(&self) -> AcmeAcceptor {
AcmeAcceptor::new(self.resolver())
}
#[cfg(feature = "axum")]
pub fn axum_acceptor(
&self,
rustls_config: Arc<rustls::ServerConfig>,
) -> crate::axum::AxumAcceptor {
crate::axum::AxumAcceptor::new(self.acceptor(), rustls_config)
}
pub fn resolver(&self) -> Arc<ResolvesServerCertAcme> {
self.resolver.clone()
}
pub fn new(config: AcmeConfig<EC, EA>) -> Self {
let config = Arc::new(config);
Self {
config: config.clone(),
resolver: ResolvesServerCertAcme::new(),
account_key: None,
early_action: None,
load_cert: Some(Box::pin({
let config = config.clone();
async move {
config
.cache
.load_cert(&config.domains, &config.directory_url)
.await
}
})),
load_account: Some(Box::pin({
let config = config.clone();
async move {
config
.cache
.load_account(&config.contact, &config.directory_url)
.await
}
})),
order: None,
valid_until: Utc.timestamp(0, 0),
backoff_cnt: 0,
wait: None,
}
}
fn parse_cert(pem: &[u8]) -> Result<(CertifiedKey, DateTime<Utc>), CertParseError> {
let mut pems = pem::parse_many(&pem)?;
if pems.len() < 2 {
return Err(CertParseError::TooFewPem(pems.len()));
}
let pk = match any_ecdsa_type(&PrivateKey(pems.remove(0).contents)) {
Ok(pk) => pk,
Err(_) => return Err(CertParseError::InvalidPrivateKey),
};
let cert_chain: Vec<RustlsCertificate> = pems
.into_iter()
.map(|p| RustlsCertificate(p.contents))
.collect();
let valid_until = match parse_x509_certificate(cert_chain[0].0.as_slice()) {
Ok((_, cert)) => Utc.timestamp(cert.validity().not_after.timestamp(), 0),
Err(err) => return Err(CertParseError::X509(err)),
};
let cert = CertifiedKey::new(cert_chain, pk);
Ok((cert, valid_until))
}
fn process_cert(&mut self, pem: Vec<u8>, cached: bool) -> Event<EC, EA> {
let (cert, valid_until) = match (Self::parse_cert(&pem), cached) {
(Ok(r), _) => r,
(Err(err), cached) => {
return match cached {
true => Err(EventError::CachedCertParse(err)),
false => Err(EventError::NewCertParse(err)),
}
}
};
self.valid_until = valid_until;
self.resolver.set_cert(Arc::new(cert));
let wait_duration = (self.valid_until - Utc::now())
.max(chrono::Duration::zero())
.div(2)
.to_std()
.unwrap_or_default();
self.wait = Some(Timer::after(wait_duration));
if cached {
return Ok(EventOk::DeployedCachedCert);
}
let config = self.config.clone();
self.early_action = Some(Box::pin(async move {
match config
.cache
.store_cert(&config.domains, &config.directory_url, &pem)
.await
{
Ok(()) => Ok(EventOk::CertCacheStore),
Err(err) => Err(EventError::CertCacheStore(err)),
}
}));
Event::Ok(EventOk::DeployedNewCert)
}
async fn order(
config: Arc<AcmeConfig<EC, EA>>,
resolver: Arc<ResolvesServerCertAcme>,
key_pair: Vec<u8>,
) -> Result<Vec<u8>, OrderError> {
let directory = Directory::discover(&config.directory_url).await?;
let account = Account::create_with_keypair(directory, &config.contact, &key_pair).await?;
let mut params = CertificateParams::new(config.domains.clone());
params.distinguished_name = DistinguishedName::new();
params.alg = &PKCS_ECDSA_P256_SHA256;
let cert = rcgen::Certificate::from_params(params)?;
let mut order = account.new_order(config.domains.clone()).await?;
loop {
order = match order {
Order::Pending {
authorizations,
finalize,
} => {
let auth_futures = authorizations
.iter()
.map(|url| Self::authorize(&resolver, &account, url));
try_join_all(auth_futures).await?;
log::info!("completed all authorizations");
Order::Ready { finalize }
}
Order::Ready { finalize } => {
log::info!("sending csr");
let csr = cert.serialize_request_der()?;
account.finalize(finalize, csr).await?
}
Order::Valid { certificate } => {
log::info!("download certificate");
let pem = [
&cert.serialize_private_key_pem(),
"\n",
&account.certificate(certificate).await?,
]
.concat();
return Ok(pem.into_bytes());
}
Order::Invalid => return Err(OrderError::BadOrder(order)),
}
}
}
async fn authorize(
resolver: &ResolvesServerCertAcme,
account: &Account,
url: &String,
) -> Result<(), OrderError> {
let (domain, challenge_url) = match account.auth(url).await? {
Auth::Pending {
identifier,
challenges,
} => {
let Identifier::Dns(domain) = identifier;
log::info!("trigger challenge for {}", &domain);
let (challenge, auth_key) = account.tls_alpn_01(&challenges, domain.clone())?;
resolver.set_auth_key(domain.clone(), Arc::new(auth_key));
account.challenge(&challenge.url).await?;
(domain, challenge.url.clone())
}
Auth::Valid => return Ok(()),
auth => return Err(OrderError::BadAuth(auth)),
};
for i in 0u64..5 {
Timer::after(Duration::from_secs(1u64 << i)).await;
match account.auth(url).await? {
Auth::Pending { .. } => {
log::info!("authorization for {} still pending", &domain);
account.challenge(&challenge_url).await?
}
Auth::Valid => return Ok(()),
auth => return Err(OrderError::BadAuth(auth)),
}
}
Err(OrderError::TooManyAttemptsAuth(domain))
}
fn poll_next_infinite(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Event<EC, EA>> {
loop {
if let Some(early_action) = &mut self.early_action {
let result = ready!(early_action.poll_unpin(cx));
self.early_action.take();
return Poll::Ready(result);
}
if let Some(timer) = &mut self.wait {
ready!(timer.poll_unpin(cx));
self.wait.take();
}
if let Some(load_cert) = &mut self.load_cert {
let result = ready!(load_cert.poll_unpin(cx));
self.load_cert.take();
match result {
Ok(Some(pem)) => {
return Poll::Ready(Self::process_cert(self.get_mut(), pem, true));
}
Ok(None) => {}
Err(err) => return Poll::Ready(Err(EventError::CertCacheLoad(err))),
}
}
if let Some(load_account) = &mut self.load_account {
let result = ready!(load_account.poll_unpin(cx));
self.load_account.take();
match result {
Ok(Some(key_pair)) => self.account_key = Some(key_pair),
Ok(None) => {}
Err(err) => return Poll::Ready(Err(EventError::AccountCacheLoad(err))),
}
}
if let Some(order) = &mut self.order {
let result = ready!(order.poll_unpin(cx));
self.order.take();
match result {
Ok(pem) => {
self.backoff_cnt = 0;
return Poll::Ready(Self::process_cert(self.get_mut(), pem, false));
}
Err(err) => {
self.wait = Some(Timer::after(Duration::from_secs(1 << self.backoff_cnt)));
self.backoff_cnt = (self.backoff_cnt + 1).min(16);
return Poll::Ready(Err(EventError::Order(err)));
}
}
}
let account_key = match &self.account_key {
None => {
let account_key = Account::generate_key_pair();
self.account_key = Some(account_key.clone());
let config = self.config.clone();
let account_key_clone = account_key.clone();
self.early_action = Some(Box::pin(async move {
match config
.cache
.store_account(
&config.contact,
&config.directory_url,
&account_key_clone,
)
.await
{
Ok(()) => Ok(EventOk::AccountCacheStore),
Err(err) => Err(EventError::AccountCacheStore(err)),
}
}));
account_key
}
Some(account_key) => account_key.clone(),
};
let config = self.config.clone();
let resolver = self.resolver.clone();
self.order = Some(Box::pin({
Self::order(config.clone(), resolver.clone(), account_key)
}));
}
}
}
impl<EC: 'static + Debug, EA: 'static + Debug> Stream for AcmeState<EC, EA> {
type Item = Event<EC, EA>;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
Poll::Ready(Some(ready!(self.poll_next_infinite(cx))))
}
}