src/auth.rs

@@ -0,0 +1,32 @@
+use std::net::SocketAddr;
+
+/// Seek compatibility with the Dovecot Authentication Protocol
+///
+/// ## Trace
+///
+/// ```text
+/// S: VERSION	1	2
+/// S: MECH	PLAIN	plaintext
+/// S: MECH	LOGIN	plaintext
+/// S: SPID	15
+/// S: CUID	17654
+/// S: COOKIE	f56692bee41f471ed01bd83520025305
+/// S: DONE
+/// C: VERSION	1	2
+/// C: CPID	1
+/// C: AUTH	2	PLAIN	service=smtp	
+/// S: CONT	2	
+/// C: CONT	2   base64string==	
+/// S: OK	2	user=alice@example.tld
+/// ```
+///
+/// ## Dovecot References
+///
+/// https://doc.dovecot.org/developer_manual/design/auth_protocol/
+/// https://doc.dovecot.org/configuration_manual/authentication/authentication_mechanisms/#authentication-authentication-mechanisms
+/// https://doc.dovecot.org/configuration_manual/howto/simple_virtual_install/#simple-virtual-install-smtp-auth
+/// https://doc.dovecot.org/configuration_manual/howto/postfix_and_dovecot_sasl/#howto-postfix-and-dovecot-sasl
+
+pub struct AuthServer {
+    bind_addr: SocketAddr,
+}

src/config.rs

@@ -21,6 +21,7 @@ pub struct ProviderConfig {
     pub imap: Option<ImapConfig>,
     pub imap_unsecure: Option<ImapUnsecureConfig>,
     pub lmtp: Option<LmtpConfig>,
+    pub auth: Option<AuthConfig>,
     pub users: UserManagement,
 }
 
@@ -32,6 +33,11 @@ pub enum UserManagement {
     Ldap(LoginLdapConfig),
 }
 
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct AuthConfig {
+    pub bind_addr: SocketAddr,
+}
+
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct LmtpConfig {
     pub bind_addr: SocketAddr,

src/main.rs

@@ -1,5 +1,6 @@
 #![feature(async_fn_in_trait)]
 
+mod auth;
 mod bayou;
 mod config;
 mod cryptoblob;
@@ -175,6 +176,9 @@ async fn main() -> Result<()> {
                 bind_addr: SocketAddr::new(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1)), 1025),
                 hostname: "example.tld".to_string(),
             }),
+            auth: Some(AuthConfig {
+                bind_addr: SocketAddr::new(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1)), 12345),
+            }),
             users: UserManagement::Demo,
         })
     } else {

src/server.rs

@@ -9,6 +9,7 @@ use tokio::sync::watch;
 
 use crate::config::*;
 use crate::imap;
+use crate::auth;
 use crate::lmtp::*;
 use crate::login::ArcLoginProvider;
 use crate::login::{demo_provider::*, ldap_provider::*, static_provider::*};
@@ -17,6 +18,7 @@ pub struct Server {
     lmtp_server: Option<Arc<LmtpServer>>,
     imap_unsecure_server: Option<imap::Server>,
     imap_server: Option<imap::Server>,
+    auth_server: Option<auth::AuthServer>,
     pid_file: Option<PathBuf>,
 }
 
@@ -31,6 +33,7 @@ impl Server {
             lmtp_server,
             imap_unsecure_server,
             imap_server: None,
+            auth_server: None,
             pid_file: config.pid,
         })
     }
@@ -51,6 +54,7 @@ impl Server {
             lmtp_server,
             imap_unsecure_server,
             imap_server,
+            auth_server: None,
             pid_file: config.pid,
         })
     }