Implement haproxy live cert reload

- Implemented live certificate reloading for haproxy using the runtime
  api. This does NOT remove deleted certificates from haproxy
- Bump version to 0.2.0

Cargo.lock

@@ -350,7 +350,7 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "le-easy-certs"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "acme2",
  "env_logger",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "le-easy-certs"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2021"
 
 [profile.release]

src/config.rs

@@ -1,14 +1,15 @@
 use serde_derive::Deserialize;
 use std::collections::{HashMap, HashSet};
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
 pub struct Config {
     pub http: ConfigHttp,
     pub certs: HashMap<String, ConfigCert>,
+    pub haproxy: Option<ConfigHaProxyRuntime>,
 }
 
 /// Config for the http server used to serve the challenges
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone,  Deserialize)]
 pub struct ConfigHttp {
     /// Binding IP address
     pub ip: String,
@@ -16,8 +17,19 @@ pub struct ConfigHttp {
     pub port: u16,
 }
 
+/// Config for a haproxy runtime api endpoint
+#[derive(Debug, Clone,  Deserialize)]
+pub struct ConfigHaProxyRuntime {
+    /// Ip address (or hostname) for the haproxy runtime api
+    pub ip: String,
+    /// Port for the haproxy runtime api
+    pub port: u16,
+    /// The directory path on the haproxy host that contains the certificates
+    pub cert_dir: String,
+}
+
 /// Configuration for a single certificate
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Clone,  Deserialize)]
 pub struct ConfigCert {
     /// Path to the account file to use for this certificate request
     pub account_file: String,

src/haproxy.rs

@@ -0,0 +1,109 @@
+use std::{path::Path, time::Duration};
+use log::debug;
+use tokio::{io::{AsyncReadExt, AsyncWriteExt}, time::timeout};
+
+#[derive(thiserror::Error, Debug)]
+pub enum HaProxyErr {
+    #[error("Connection error")]
+    Connection,
+    #[error("Update failed")]
+    UpdateFailed,
+}
+
+pub struct HaProxyApi {
+    ip: String,
+    port: u16,
+    cert_dir: String,
+}
+
+impl HaProxyApi {
+    pub fn new(ip: &str, port: u16, cert_dir: &str) -> Self {
+        let ip = ip.to_string();
+        let cert_dir = cert_dir.to_string();
+        Self { ip, port, cert_dir }
+    }
+
+    pub async fn update_cert<T: AsRef<Path>>(&mut self, cert_path: T) -> Result<(), HaProxyErr> {
+        let cert_path = cert_path.as_ref();
+        let cert_name = cert_path.file_name().unwrap().to_string_lossy().to_string();
+        let cert_content = tokio::fs::read_to_string(cert_path).await.unwrap();
+        let haproxy_ssl_dir = &self.cert_dir;
+        
+        debug!("Trying to update haproxy cert in memory: {haproxy_ssl_dir}/{cert_name} <- {}", cert_path.display());
+
+        // Check for active transactions and abort them
+        let resp = self.send(&format!("show ssl cert")).await?;
+        let transactions = resp.lines().filter(|line| line.starts_with("*")).map(|line| &line[1..]).collect::<Vec<_>>();
+        for transaction in transactions {
+            self.send(&format!("abort ssl cert {transaction}")).await?;
+        }
+
+        // Try to create a new certificate in memory. This will do nothing when existing
+        let resp = self.send(&format!("new ssl cert {haproxy_ssl_dir}/{cert_name}")).await?;
+
+        if !resp.contains("already exists") && !resp.contains("New empty certificate store ") {
+            return Err(HaProxyErr::UpdateFailed);
+        }
+
+        // Set the cert data in memory to the new cert. This beginns a transaction
+        let resp = self.send(&format!("set ssl cert {haproxy_ssl_dir}/{cert_name} <<\n{cert_content}")).await?;
+
+        if !resp.contains("Transaction created") {
+            return Err(HaProxyErr::UpdateFailed);
+        }
+
+        // Commit the cert data transaction
+        let resp = self.send(&format!("commit ssl cert {haproxy_ssl_dir}/{cert_name}")).await?;
+
+        if !resp.contains("Success") {
+            self.send(&format!("abort ssl cert {haproxy_ssl_dir}/{cert_name}")).await?;
+            return Err(HaProxyErr::UpdateFailed);
+        }
+
+        // Try to add the certificate to the active list. This will do nothing if it is contained already
+        let resp = self.send(&format!("add ssl crt-list {haproxy_ssl_dir} <<\n{haproxy_ssl_dir}/{cert_name}\n")).await?;
+
+        if !resp.contains("already exists") && !resp.contains("Inserting certificate") {
+            return Err(HaProxyErr::UpdateFailed);
+        }
+
+        Ok(())
+    }
+
+    pub async fn send(&self, cmd: &str) -> Result<String, HaProxyErr> {
+        debug!("[Haproxy] send> '{cmd}'");
+
+        let mut con = tokio::net::TcpStream::connect((self.ip.as_str(), self.port))
+            .await
+            .map_err(|_| HaProxyErr::Connection)?;
+
+        con.write_all(cmd.as_bytes())
+            .await
+            .map_err(|_| HaProxyErr::Connection)?;
+        
+        con.write_all(&[b'\n'])
+            .await
+            .map_err(|_| HaProxyErr::Connection)?;
+
+        con.flush().await.unwrap();
+
+        let mut response = Vec::new();
+        let mut buf = [0_u8; 1024];
+
+        loop {
+            match timeout(Duration::from_millis(5_000), con.read(&mut buf)).await {
+                // No bytes read, or timeout
+                Ok(Ok(0)) | Err(_) => break,
+                Ok(Ok(read)) => {
+                    response.extend_from_slice(&buf[..read]);
+                }
+                Ok(Err(_)) => return Err(HaProxyErr::Connection),
+            }
+        }
+
+        let response = String::from_utf8_lossy(&response).to_string();
+        debug!("[Haproxy] receive> '{response}'");
+
+        Ok(response)
+    }
+}

src/main.rs

@@ -3,12 +3,13 @@ use log::{debug, error, info};
 use crate::{
     certs::{load_cert_from_fullchain, AcmeApiEndpoint, CertExt, CertRequester},
     config::Config,
-    http::ChallengeServer,
+    http::ChallengeServer, haproxy::HaProxyApi,
 };
 
 mod certs;
 mod config;
 mod http;
+mod haproxy;
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
@@ -31,6 +32,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     debug!("Config file: {:#?}", &conf);
 
+    let mut haproxyapi = conf.haproxy.map(|ha| HaProxyApi::new(&ha.ip, ha.port, &ha.cert_dir));
+
     // Create the http server for serving the challenges
     let srv = ChallengeServer::new(&conf.http.ip, conf.http.port)?;
     let mgr = srv.clone_challenge_mgr();
@@ -66,9 +69,16 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
             info!("Certificate {name} needs to be renewed. Using endpoint: {endpoint}");
 
-            let requester = CertRequester::new(endpoint, conf, mgr.clone());
-            if let Err(e) = requester.request_certs().await {
-                error!("Certificate request for {name} failed: {e}");
+            let requester = CertRequester::new(endpoint, conf.clone(), mgr.clone());
+            match (requester.request_certs().await, &mut haproxyapi) {
+                (Ok(_), Some(api)) => {
+                    match api.update_cert(&conf.fullchain_file).await {
+                        Ok(()) => info!("Certificate update in haproxy completed"),
+                        Err(e) => error!("Certificate update in haproxy failed: {e}")
+                    }
+                }
+                (Err(e), _) => error!("Certificate request for {name} failed: {e}"),
+                _ => ()
             }
         } else {
             info!("Certificate {name} does not need to be renewed");