Change the hook and domains definitions

The previous system was too limited when it comes to flexibility using
hooks. This limitation came from the false idea that, for a given
certificate, all challenges must be validated with the same method. In
order to prove that false, domains in a certificate can now make use of
any challenge type available.
In order to be more flexible, hooks are now given a type and are defined
in the same registry (instead of 6). Each one will be called when
considered relevant based on its type.

CHANGELOG.md

@@ -9,16 +9,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 - An account object has been added in the configuration.
+- In the configuration, hooks now have a mandatory `type` variable.
+- It is now possible to declare hooks to clean after the challenge validation hooks.
 - Failure recovery: HTTPS requests rejected by the server that are recoverable, like the badNonce error, are now retried several times before being considered a hard failure.
 - The TLS-ALPN-01 challenge is now supported. The proof is a string representation of the acmeIdentifier extension. The self-signed certificate itself has to be built by a hook.
 
 ### Changed
 - In the configuration, the `email` certificate field has been replaced by the `account` field which matches an account object.
+- The format of the `domain` configuration variable has changed and now includes the challenge type.
 - The `token` challenge hook variable has been renamed `file_name`.
+- The `challenge_hooks`, `post_operation_hooks`, `file_pre_create_hooks`, `file_post_create_hooks`, `file_pre_edit_hooks` and `file_post_edit_hooks` certificate variables has been replaced by `hooks`.
 - The logs has been purged from many useless debug and trace entries.
 
 ### Removed
 - The DER storage format has been removed.
+- The `challenge` certificate variables has been removed.
 
 
 ## [0.2.1] - 2019-03-30

README.md

@@ -18,6 +18,7 @@ The Automatic Certificate Management Environment (ACME), is an internet standard
 - Nice and simple configuration file
 - Retry of HTTPS request rejected with a badNonce or other recoverable errors
 - Optional private-key reuse (useful for [HPKP](https://en.wikipedia.org/wiki/HTTP_Public_Key_Pinning))
+- For a given certificate, each domain names may be validated using a different challenge.
 
 
 ## Planned features

acmed/acmed_example.toml

@@ -13,13 +13,28 @@ url = "https://acme-staging-v02.api.letsencrypt.org/directory"
 tos_agreed = false
 
 [[hook]]
-name = "http-echo"
+name = "http-echo-create"
+type = ["challenge-http-01"]
 cmd = "echo"
 args = ["{{proof}}"]
 stdout = "/srv/http/{{current_domain}}/.well-known/acme-challenge/{{file_name}}"
 
+[[hook]]
+name = "http-echo-clean"
+type = ["challenge-http-01-clean"]
+cmd = "rm"
+args = [
+    "-f",
+    "/srv/http/{{current_domain}}/.well-known/acme-challenge/{{file_name}}"
+]
+
+[[group]]
+name = "http-echo"
+hooks = ["http-echo-create", "http-echo-clean"]
+
 [[hook]]
 name = "email-report"
+type = ["post-operation"]
 cmd = "sendmail"
 args = [
     "-f", "noreply@example.org",
@@ -41,12 +56,10 @@ email = "certs@example.org"
 account = "test_account"
 endpoint = "letsencrypt v2 staging"
 domains = [
-    "example.org",
-    "sub-1.example.org",
-    "sub-2.example.org"
+    { dns = "example.org", challenge = "http-01"},
+    { dns = "sub-1.example.org", challenge = "http-01" }
+    { dns = "sub-2.example.org", challenge = "http-01" }
 ]
 algorithm = "ecdsa_p384"
 kp_reuse = false
-challenge = "http-01"
-challenge_hooks = ["http-echo"]
-post_operation_hooks = ["email-report"]
+hooks = ["http-echo", "email-report"]

acmed/src/acme_proto.rs

@@ -67,6 +67,13 @@ macro_rules! set_empty_data_builder {
 }
 
 pub fn request_certificate(cert: &Certificate) -> Result<(), Error> {
+    let domains = cert
+        .domains
+        .iter()
+        .map(|d| d.0.to_owned())
+        .collect::<Vec<String>>();
+    let mut hook_datas = vec![];
+
     // 1. Get the directory
     let directory = http::get_directory(&cert.remote_url)?;
 
@@ -77,7 +84,7 @@ pub fn request_certificate(cert: &Certificate) -> Result<(), Error> {
     let (account, nonce) = AccountManager::new(cert, &directory, &nonce)?;
 
     // 4. Create a new order
-    let new_order = NewOrder::new(&cert.domains);
+    let new_order = NewOrder::new(&domains);
     let new_order = serde_json::to_string(&new_order)?;
     let data_builder = set_data_builder!(account, new_order.as_bytes(), directory.new_order);
     let (order, order_url, mut nonce): (Order, String, String) =
@@ -102,14 +109,16 @@ pub fn request_certificate(cert: &Certificate) -> Result<(), Error> {
         }
 
         // 6. For each authorization, fetch the associated challenges
+        let current_challenge = cert.get_domain_challenge(&auth.identifier.value)?;
         for challenge in auth.challenges.iter() {
-            if cert.challenge == *challenge {
+            if current_challenge == *challenge {
                 let proof = challenge.get_proof(&account.priv_key)?;
                 let file_name = challenge.get_file_name();
                 let domain = auth.identifier.value.to_owned();
 
                 // 7. Call the challenge hook in order to complete it
-                cert.call_challenge_hooks(&file_name, &proof, &domain)?;
+                let data = cert.call_challenge_hooks(&file_name, &proof, &domain)?;
+                hook_datas.push(data);
 
                 // 8. Tell the server the challenge has been completed
                 let chall_url = challenge.get_url();
@@ -153,6 +162,10 @@ pub fn request_certificate(cert: &Certificate) -> Result<(), Error> {
     let (crt, _) = http::get_certificate(&crt_url, &data_builder, &nonce)?;
     storage::write_certificate(cert, &crt.as_bytes())?;
 
-    info!("Certificate renewed for {}", cert.domains.join(", "));
+    for (data, hook_type) in hook_datas.iter() {
+        cert.call_challenge_hooks_clean(&data, (*hook_type).to_owned())?;
+    }
+
+    info!("Certificate renewed for {}", domains.join(", "));
     Ok(())
 }

acmed/src/acme_proto/certificate.rs

@@ -46,7 +46,7 @@ pub fn generate_csr(
     builder.set_pubkey(pub_key)?;
     let ctx = builder.x509v3_context(None);
     let mut san = SubjectAlternativeName::new();
-    for name in cert.domains.iter() {
+    for name in cert.domains.iter().map(|d| d.0.to_owned()) {
         san.dns(&name);
     }
     let san = san.build(&ctx)?;

acmed/src/certificate.rs

@@ -1,5 +1,5 @@
 use crate::acme_proto::Challenge;
-use crate::config::Account;
+use crate::config::{Account, HookType};
 use crate::hooks::{self, ChallengeHookData, Hook, PostOperationHookData};
 use crate::storage::{certificate_files_exists, get_certificate};
 use acme_common::error::Error;
@@ -42,14 +42,12 @@ impl fmt::Display for Algorithm {
 #[derive(Debug)]
 pub struct Certificate {
     pub account: Account,
-    pub domains: Vec<String>,
+    pub domains: Vec<(String, Challenge)>,
     pub algo: Algorithm,
     pub kp_reuse: bool,
     pub remote_url: String,
     pub tos_agreed: bool,
-    pub challenge: Challenge,
-    pub challenge_hooks: Vec<Hook>,
-    pub post_operation_hooks: Vec<Hook>,
+    pub hooks: Vec<Hook>,
     pub account_directory: String,
     pub crt_directory: String,
     pub crt_name: String,
@@ -60,24 +58,20 @@ pub struct Certificate {
     pub pk_file_mode: u32,
     pub pk_file_owner: Option<String>,
     pub pk_file_group: Option<String>,
-    pub file_pre_create_hooks: Vec<Hook>,
-    pub file_post_create_hooks: Vec<Hook>,
-    pub file_pre_edit_hooks: Vec<Hook>,
-    pub file_post_edit_hooks: Vec<Hook>,
 }
 
 impl fmt::Display for Certificate {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        let challenge_hooks = self
-            .challenge_hooks
+        let hooks = self
+            .hooks
             .iter()
             .map(std::string::ToString::to_string)
             .collect::<Vec<String>>()
             .join(", ");
-        let post_operation_hooks = self
-            .post_operation_hooks
+        let domains = self
+            .domains
             .iter()
-            .map(std::string::ToString::to_string)
+            .map(|d| format!("{} ({})", d.0, d.1))
             .collect::<Vec<String>>()
             .join(", ");
         write!(
@@ -87,21 +81,28 @@ Domains: {domains}
 Algorithm: {algo}
 Account: {account}
 Private key reuse: {kp_reuse}
-Challenge: {challenge}
-Challenge hooks: {challenge_hooks}
-Post operation hooks: {post_operation_hooks}",
-            domains = self.domains.join(", "),
+Hooks: {hooks}",
+            domains = domains,
             algo = self.algo,
             account = self.account.name,
             kp_reuse = self.kp_reuse,
-            challenge = self.challenge,
-            challenge_hooks = challenge_hooks,
-            post_operation_hooks = post_operation_hooks,
+            hooks = hooks,
         )
     }
 }
 
 impl Certificate {
+    pub fn get_domain_challenge(&self, domain_name: &str) -> Result<Challenge, Error> {
+        let domain_name = domain_name.to_string();
+        for (domain, challenge) in self.domains.iter() {
+            if *domain == domain_name {
+                return Ok((*challenge).to_owned());
+            }
+        }
+        let msg = format!("{}: domain name not found", domain_name);
+        Err(msg.into())
+    }
+
     pub fn should_renew(&self) -> Result<bool, Error> {
         if !certificate_files_exists(&self) {
             debug!("certificate does not exist: requesting one");
@@ -135,27 +136,47 @@ impl Certificate {
         file_name: &str,
         proof: &str,
         domain: &str,
-    ) -> Result<(), Error> {
+    ) -> Result<(ChallengeHookData, HookType), Error> {
+        let challenge = self.get_domain_challenge(domain)?;
         let hook_data = ChallengeHookData {
-            domains: self.domains.to_owned(),
             algorithm: self.algo.to_string(),
-            challenge: self.challenge.to_string(),
-            current_domain: domain.to_string(),
+            challenge: challenge.to_string(),
+            domain: domain.to_string(),
             file_name: file_name.to_string(),
             proof: proof.to_string(),
         };
-        hooks::call_multiple(&hook_data, &self.challenge_hooks)?;
-        Ok(())
+        let hook_type = match challenge {
+            Challenge::Http01 => (HookType::ChallengeHttp01, HookType::ChallengeHttp01Clean),
+            Challenge::Dns01 => (HookType::ChallengeDns01, HookType::ChallengeDns01Clean),
+            Challenge::TlsAlpn01 => (
+                HookType::ChallengeTlsAlpn01,
+                HookType::ChallengeTlsAlpn01Clean,
+            ),
+        };
+        hooks::call(&hook_data, &self.hooks, hook_type.0)?;
+        Ok((hook_data, hook_type.1))
+    }
+
+    pub fn call_challenge_hooks_clean(
+        &self,
+        data: &ChallengeHookData,
+        hook_type: HookType,
+    ) -> Result<(), Error> {
+        hooks::call(data, &self.hooks, hook_type)
     }
 
     pub fn call_post_operation_hooks(&self, status: &str) -> Result<(), Error> {
+        let domains = self
+            .domains
+            .iter()
+            .map(|d| format!("{} ({})", d.0, d.1))
+            .collect::<Vec<String>>();
         let hook_data = PostOperationHookData {
-            domains: self.domains.to_owned(),
+            domains,
             algorithm: self.algo.to_string(),
-            challenge: self.challenge.to_string(),
             status: status.to_string(),
         };
-        hooks::call_multiple(&hook_data, &self.post_operation_hooks)?;
+        hooks::call(&hook_data, &self.hooks, HookType::PostOperation)?;
         Ok(())
     }
 }

acmed/src/config.rs

@@ -1,9 +1,9 @@
-use crate::acme_proto::Challenge;
 use crate::certificate::Algorithm;
 use crate::hooks;
 use acme_common::error::Error;
 use log::info;
 use serde::Deserialize;
+use std::fmt;
 use std::fs::{self, File};
 use std::io::prelude::*;
 use std::path::Path;
@@ -37,6 +37,7 @@ impl Config {
             if name == hook.name {
                 let h = hooks::Hook {
                     name: hook.name.to_owned(),
+                    hook_type: hook.hook_type.to_owned(),
                     cmd: hook.cmd.to_owned(),
                     args: hook.args.to_owned(),
                     stdin: hook.stdin.to_owned(),
@@ -130,6 +131,8 @@ pub struct Endpoint {
 #[derive(Deserialize)]
 pub struct Hook {
     pub name: String,
+    #[serde(rename = "type")]
+    pub hook_type: Vec<HookType>,
     pub cmd: String,
     pub args: Option<Vec<String>>,
     pub stdin: Option<String>,
@@ -137,6 +140,28 @@ pub struct Hook {
     pub stderr: Option<String>,
 }
 
+#[derive(Clone, Debug, Eq, PartialEq, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum HookType {
+    FilePreCreate,
+    FilePostCreate,
+    FilePreEdit,
+    FilePostEdit,
+    #[serde(rename = "challenge-http-01")]
+    ChallengeHttp01,
+    #[serde(rename = "challenge-http-01-clean")]
+    ChallengeHttp01Clean,
+    #[serde(rename = "challenge-dns-01")]
+    ChallengeDns01,
+    #[serde(rename = "challenge-dns-01-clean")]
+    ChallengeDns01Clean,
+    #[serde(rename = "challenge-tls-alpn-01")]
+    ChallengeTlsAlpn01,
+    #[serde(rename = "challenge-tls-alpn-01-clean")]
+    ChallengeTlsAlpn01Clean,
+    PostOperation,
+}
+
 #[derive(Deserialize)]
 pub struct Group {
     pub name: String,
@@ -153,20 +178,14 @@ pub struct Account {
 pub struct Certificate {
     pub account: String,
     pub endpoint: String,
-    pub domains: Vec<String>,
-    pub challenge: String,
+    pub domains: Vec<Domain>,
     pub algorithm: Option<String>,
     pub kp_reuse: Option<bool>,
     pub directory: Option<String>,
     pub name: Option<String>,
     pub name_format: Option<String>,
     pub formats: Option<Vec<String>>,
-    pub challenge_hooks: Vec<String>,
-    pub post_operation_hooks: Option<Vec<String>>,
-    pub file_pre_create_hooks: Option<Vec<String>>,
-    pub file_post_create_hooks: Option<Vec<String>>,
-    pub file_pre_edit_hooks: Option<Vec<String>>,
-    pub file_post_edit_hooks: Option<Vec<String>>,
+    pub hooks: Vec<String>,
 }
 
 impl Certificate {
@@ -187,10 +206,6 @@ impl Certificate {
         Algorithm::from_str(algo)
     }
 
-    pub fn get_challenge(&self) -> Result<Challenge, Error> {
-        Challenge::from_str(&self.challenge)
-    }
-
     pub fn get_kp_reuse(&self) -> bool {
         match self.kp_reuse {
             Some(b) => b,
@@ -201,7 +216,7 @@ impl Certificate {
     pub fn get_crt_name(&self) -> String {
         match &self.name {
             Some(n) => n.to_string(),
-            None => self.domains.first().unwrap().to_string(),
+            None => self.domains.first().unwrap().dns.to_owned(),
         }
     }
 
@@ -245,53 +260,26 @@ impl Certificate {
         Ok(ep.tos_agreed)
     }
 
-    pub fn get_challenge_hooks(&self, cnf: &Config) -> Result<Vec<hooks::Hook>, Error> {
-        get_hooks(&self.challenge_hooks, cnf)
-    }
-
-    pub fn get_post_operation_hooks(&self, cnf: &Config) -> Result<Vec<hooks::Hook>, Error> {
-        match &self.post_operation_hooks {
-            Some(hooks) => get_hooks(hooks, cnf),
-            None => Ok(vec![]),
-        }
-    }
-
-    pub fn get_file_pre_create_hooks(&self, cnf: &Config) -> Result<Vec<hooks::Hook>, Error> {
-        match &self.file_pre_create_hooks {
-            Some(hooks) => get_hooks(hooks, cnf),
-            None => Ok(vec![]),
-        }
-    }
-
-    pub fn get_file_post_create_hooks(&self, cnf: &Config) -> Result<Vec<hooks::Hook>, Error> {
-        match &self.file_post_create_hooks {
-            Some(hooks) => get_hooks(hooks, cnf),
-            None => Ok(vec![]),
-        }
-    }
-
-    pub fn get_file_pre_edit_hooks(&self, cnf: &Config) -> Result<Vec<hooks::Hook>, Error> {
-        match &self.file_pre_edit_hooks {
-            Some(hooks) => get_hooks(hooks, cnf),
-            None => Ok(vec![]),
+    pub fn get_hooks(&self, cnf: &Config) -> Result<Vec<hooks::Hook>, Error> {
+        let mut res = vec![];
+        for name in self.hooks.iter() {
+            let mut h = cnf.get_hook(&name)?;
+            res.append(&mut h);
         }
+        Ok(res)
     }
+}
 
-    pub fn get_file_post_edit_hooks(&self, cnf: &Config) -> Result<Vec<hooks::Hook>, Error> {
-        match &self.file_post_edit_hooks {
-            Some(hooks) => get_hooks(hooks, cnf),
-            None => Ok(vec![]),
-        }
-    }
+#[derive(Clone, Debug, Deserialize)]
+pub struct Domain {
+    pub challenge: String,
+    pub dns: String,
 }
 
-fn get_hooks(lst: &[String], cnf: &Config) -> Result<Vec<hooks::Hook>, Error> {
-    let mut res = vec![];
-    for name in lst.iter() {
-        let mut h = cnf.get_hook(&name)?;
-        res.append(&mut h);
+impl fmt::Display for Domain {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.dns)
     }
-    Ok(res)
 }
 
 fn create_dir(path: &str) -> Result<(), Error> {

acmed/src/hooks.rs

@@ -1,3 +1,4 @@
+use crate::config::HookType;
 use acme_common::error::Error;
 use handlebars::Handlebars;
 use log::debug;
@@ -12,16 +13,14 @@ use std::process::{Command, Stdio};
 pub struct PostOperationHookData {
     pub domains: Vec<String>,
     pub algorithm: String,
-    pub challenge: String,
     pub status: String,
 }
 
 #[derive(Serialize)]
 pub struct ChallengeHookData {
-    pub domains: Vec<String>,
+    pub domain: String,
     pub algorithm: String,
     pub challenge: String,
-    pub current_domain: String,
     pub file_name: String,
     pub proof: String,
 }
@@ -37,6 +36,7 @@ pub struct FileStorageHookData {
 #[derive(Clone, Debug)]
 pub struct Hook {
     pub name: String,
+    pub hook_type: Vec<HookType>,
     pub cmd: String,
     pub args: Option<Vec<String>>,
     pub stdin: Option<String>,
@@ -63,7 +63,7 @@ macro_rules! get_hook_output {
     }};
 }
 
-pub fn call<T: Serialize>(data: &T, hook: &Hook) -> Result<(), Error> {
+fn call_single<T: Serialize>(data: &T, hook: &Hook) -> Result<(), Error> {
     debug!("Calling hook: {}", hook.name);
     let reg = Handlebars::new();
     let mut v = vec![];
@@ -103,9 +103,9 @@ pub fn call<T: Serialize>(data: &T, hook: &Hook) -> Result<(), Error> {
     Ok(())
 }
 
-pub fn call_multiple<T: Serialize>(data: &T, hooks: &[Hook]) -> Result<(), Error> {
-    for hook in hooks.iter() {
-        call(data, &hook)?;
+pub fn call<T: Serialize>(data: &T, hooks: &[Hook], hook_type: HookType) -> Result<(), Error> {
+    for hook in hooks.iter().filter(|h| h.hook_type.contains(&hook_type)) {
+        call_single(data, &hook)?;
     }
     Ok(())
 }

acmed/src/main_event_loop.rs

@@ -1,4 +1,5 @@
 use crate::acme_proto::request_certificate;
+use crate::acme_proto::Challenge;
 use crate::certificate::Certificate;
 use crate::config;
 use acme_common::error::Error;
@@ -18,14 +19,16 @@ impl MainEventLoop {
         for crt in cnf.certificate.iter() {
             let cert = Certificate {
                 account: crt.get_account(&cnf)?,
-                domains: crt.domains.to_owned(),
+                domains: crt
+                    .domains
+                    .iter()
+                    .map(|d| (d.dns.to_owned(), Challenge::from_str(&d.challenge).unwrap()))
+                    .collect(),
                 algo: crt.get_algorithm()?,
                 kp_reuse: crt.get_kp_reuse(),
                 remote_url: crt.get_remote_url(&cnf)?,
                 tos_agreed: crt.get_tos_agreement(&cnf)?,
-                challenge: crt.get_challenge()?,
-                challenge_hooks: crt.get_challenge_hooks(&cnf)?,
-                post_operation_hooks: crt.get_post_operation_hooks(&cnf)?,
+                hooks: crt.get_hooks(&cnf)?,
                 account_directory: cnf.get_account_dir(),
                 crt_directory: crt.get_crt_dir(&cnf),
                 crt_name: crt.get_crt_name(),
@@ -36,10 +39,6 @@ impl MainEventLoop {
                 pk_file_mode: cnf.get_pk_file_mode(),
                 pk_file_owner: cnf.get_pk_file_user(),
                 pk_file_group: cnf.get_pk_file_group(),
-                file_pre_create_hooks: crt.get_file_pre_create_hooks(&cnf)?,
-                file_post_create_hooks: crt.get_file_post_create_hooks(&cnf)?,
-                file_pre_edit_hooks: crt.get_file_pre_edit_hooks(&cnf)?,
-                file_post_edit_hooks: crt.get_file_post_edit_hooks(&cnf)?,
             };
             certs.push(cert);
         }
@@ -60,7 +59,7 @@ impl MainEventLoop {
                                     let msg = format!(
                                         "Unable to renew the {} certificate for {}: {}",
                                         crt.algo,
-                                        crt.domains.first().unwrap(),
+                                        crt.domains.first().unwrap().0,
                                         e
                                     );
                                     warn!("{}", msg);
@@ -73,7 +72,7 @@ impl MainEventLoop {
                                     let msg = format!(
                                         "{} certificate for {}: post-operation hook error: {}",
                                         crt.algo,
-                                        crt.domains.first().unwrap(),
+                                        crt.domains.first().unwrap().0,
                                         e
                                     );
                                     warn!("{}", msg);

acmed/src/storage.rs

@@ -1,4 +1,5 @@
 use crate::certificate::Certificate;
+use crate::config::HookType;
 use crate::hooks::{self, FileStorageHookData};
 use acme_common::b64_encode;
 use acme_common::error::Error;
@@ -141,9 +142,9 @@ fn write_file(cert: &Certificate, file_type: FileType, data: &[u8]) -> Result<()
     let is_new = !path.is_file();
 
     if is_new {
-        hooks::call_multiple(&hook_data, &cert.file_pre_create_hooks)?;
+        hooks::call(&hook_data, &cert.hooks, HookType::FilePreCreate)?;
     } else {
-        hooks::call_multiple(&hook_data, &cert.file_pre_edit_hooks)?;
+        hooks::call(&hook_data, &cert.hooks, HookType::FilePreEdit)?;
     }
 
     trace!("Writing file {:?}", path);
@@ -165,9 +166,9 @@ fn write_file(cert: &Certificate, file_type: FileType, data: &[u8]) -> Result<()
     }
 
     if is_new {
-        hooks::call_multiple(&hook_data, &cert.file_post_create_hooks)?;
+        hooks::call(&hook_data, &cert.hooks, HookType::FilePostCreate)?;
     } else {
-        hooks::call_multiple(&hook_data, &cert.file_post_edit_hooks)?;
+        hooks::call(&hook_data, &cert.hooks, HookType::FilePostEdit)?;
     }
     Ok(())
 }

tacd/src/server.rs

@@ -20,8 +20,7 @@ pub fn start(
     let mut acceptor = SslAcceptor::mozilla_intermediate(SslMethod::tls())?;
     acceptor.set_alpn_select_callback(|_, client| {
         debug!("ALPN negociation");
-        ssl::select_next_proto(crate::ALPN_ACME_PROTO_NAME, client)
-            .ok_or(ALPN_ERROR)
+        ssl::select_next_proto(crate::ALPN_ACME_PROTO_NAME, client).ok_or(ALPN_ERROR)
     });
     acceptor.set_private_key(private_key)?;
     acceptor.set_certificate(certificate)?;