.gitignore

@@ -1,5 +1,3 @@
 target
 .idea
-*.crt
-*.key
 pki

Cargo.lock

@@ -1042,6 +1042,15 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "mktemp"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "975de676448231fcde04b9149d2543077e166b78fc29eae5aa219e7928410da2"
+dependencies = [
+ "uuid",
+]
+
 [[package]]
 name = "nom"
 version = "7.1.1"
@@ -1602,7 +1611,9 @@ dependencies = [
  "futures",
  "hyper-rustls",
  "log",
+ "mktemp",
  "pem",
+ "rand",
  "reqwest",
  "rustls",
  "rustls-pemfile",
@@ -1872,6 +1883,15 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
+[[package]]
+name = "uuid"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc5cf98d8186244414c848017f0e2676b3fcb46807f6668a97dfe67359a3c4b7"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "version_check"
 version = "0.9.4"

Cargo.toml

@@ -25,3 +25,7 @@ hyper-rustls = { version = "0.23.0", features = ["rustls-native-certs"] }
 bytes = "1.2.1"
 rustls-pemfile = "1.0.1"
 rustls = "0.20.6"
+
+[dev-dependencies]
+rand = "0.8.5"
+mktemp = "0.4.1"

src/base/cert_utils.rs

@@ -50,10 +50,10 @@ pub fn parse_pem_private_key(privkey: &[u8]) -> Result<PrivateKey, Box<dyn Error
 
 #[cfg(test)]
 mod test {
-    use crate::cert_utils::{parse_pem_certificates, parse_pem_private_key};
+    use crate::base::cert_utils::{parse_pem_certificates, parse_pem_private_key};
 
-    const SAMPLE_CERT: &[u8] = include_bytes!("../samples/TCPTunnelTest.crt");
+    const SAMPLE_CERT: &[u8] = include_bytes!("samples/TCPTunnelTest.crt");
-    const SAMPLE_KEY: &[u8] = include_bytes!("../samples/TCPTunnelTest.key");
+    const SAMPLE_KEY: &[u8] = include_bytes!("samples/TCPTunnelTest.key");
 
     #[test]
     fn parse_valid_cert() {

src/base/err_utils.rs

@@ -0,0 +1,12 @@
+use std::fmt::Display;
+use std::io::ErrorKind;
+
+/// Encapsulate errors in [`std::io::Error`] with a message
+pub fn encpasulate_error<E: Display, F: ToString>(e: E, msg: F) -> std::io::Error {
+    std::io::Error::new(ErrorKind::Other, format!("{}:\n* {}", msg.to_string(), e))
+}
+
+/// Create a new [`std::io::Error`]
+pub fn new_err(msg: &str) -> std::io::Error {
+    std::io::Error::new(ErrorKind::Other, msg.to_string())
+}

src/base/mod.rs

@@ -1,4 +1,5 @@
 pub mod cert_utils;
+pub mod err_utils;
 mod structs;
 
 pub use structs::{RelayedPort, RemoteConfig};

src/base/samples/TCPTunnelTest.crt

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

src/base/samples/TCPTunnelTest.key

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----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=
+-----END RSA PRIVATE KEY-----

src/lib.rs

@@ -1,3 +1,6 @@
 mod base;
 pub mod tcp_relay_client;
 pub mod tcp_relay_server;
+
+#[cfg(test)]
+mod test;

src/main.rs

@@ -36,3 +36,14 @@ async fn main() -> std::io::Result<()> {
         SubCommands::Client(c) => tcp_over_http::tcp_relay_client::run_app(c).await,
     }
 }
+
+#[cfg(test)]
+mod test {
+    use crate::CliArgs;
+
+    #[test]
+    fn verify_cli() {
+        use clap::CommandFactory;
+        CliArgs::command().debug_assert()
+    }
+}

src/tcp_relay_client/client_config.rs

@@ -1,8 +1,9 @@
+use crate::base::err_utils::encpasulate_error;
 use bytes::BufMut;
 use clap::Parser;
 
 /// TCP relay client
-#[derive(Parser, Debug, Clone)]
+#[derive(Parser, Debug, Clone, Default)]
 #[clap(author, version, about, long_about = None)]
 pub struct ClientConfig {
     /// Access token
@@ -21,41 +22,37 @@ pub struct ClientConfig {
     #[clap(short = 'c', long)]
     pub root_certificate: Option<String>,
 
-    #[clap(skip)]
-    _root_certificate_cache: Option<Vec<u8>>,
-
     /// TLS certificate for TLS authentication.
     #[clap(long)]
     pub tls_cert: Option<String>,
 
-    #[clap(skip)]
-    _tls_cert_cache: Option<Vec<u8>>,
-
     /// TLS key for TLS authentication.
     #[clap(long)]
     pub tls_key: Option<String>,
 
+    #[clap(skip)]
+    pub _keys_cache: KeysCache,
+}
+
+#[derive(Parser, Debug, Clone, Default)]
+pub struct KeysCache {
+    #[clap(skip)]
+    _root_certificate_cache: Option<Vec<u8>>,
+    #[clap(skip)]
+    _tls_cert_cache: Option<Vec<u8>>,
     #[clap(skip)]
     _tls_key_cache: Option<Vec<u8>>,
 }
 
 impl ClientConfig {
     /// Load certificates and put them in cache
-    pub fn load_certificates(&mut self) {
+    pub fn load_certificates(&mut self) -> std::io::Result<()> {
-        self._root_certificate_cache = self
+        self._keys_cache = KeysCache {
-            .root_certificate
+            _root_certificate_cache: load_pem_file(&self.root_certificate, "root certificate")?,
-            .as_ref()
+            _tls_cert_cache: load_pem_file(&self.tls_cert, "client certificate")?,
-            .map(|c| std::fs::read(c).expect("Failed to read root certificate!"));
+            _tls_key_cache: load_pem_file(&self.tls_key, "client key")?,
-
+        };
-        self._tls_cert_cache = self
+        Ok(())
-            .tls_cert
-            .as_ref()
-            .map(|c| std::fs::read(c).expect("Failed to read client certificate!"));
-
-        self._tls_key_cache = self
-            .tls_key
-            .as_ref()
-            .map(|c| std::fs::read(c).expect("Failed to read client key!"));
     }
 
     /// Get client token, returning a dummy token if none was specified
@@ -65,12 +62,15 @@ impl ClientConfig {
 
     /// Get root certificate content
     pub fn get_root_certificate(&self) -> Option<Vec<u8>> {
-        self._root_certificate_cache.clone()
+        self._keys_cache._root_certificate_cache.clone()
     }
 
     /// Get client certificate & key pair, if available
     pub fn get_client_keypair(&self) -> Option<(&Vec<u8>, &Vec<u8>)> {
-        if let (Some(cert), Some(key)) = (&self._tls_cert_cache, &self._tls_key_cache) {
+        if let (Some(cert), Some(key)) = (
+            &self._keys_cache._tls_cert_cache,
+            &self._keys_cache._tls_key_cache,
+        ) {
             Some((cert, key))
         } else {
             None
@@ -88,9 +88,19 @@ impl ClientConfig {
     }
 }
 
+fn load_pem_file(path: &Option<String>, name: &str) -> std::io::Result<Option<Vec<u8>>> {
+    Ok(match path {
+        None => None,
+        Some(p) => Some(
+            std::fs::read(p)
+                .map_err(|e| encpasulate_error(e, format!("Failed to load {}!", name)))?,
+        ),
+    })
+}
+
 #[cfg(test)]
 mod test {
-    use crate::client_config::ClientConfig;
+    use crate::tcp_relay_client::client_config::ClientConfig;
 
     #[test]
     fn verify_cli() {

src/tcp_relay_client/mod.rs

@@ -1,11 +1,13 @@
 extern crate core;
 
 use std::error::Error;
+use std::io::ErrorKind;
 use std::sync::Arc;
 
 use futures::future::join_all;
 use reqwest::{Certificate, Identity};
 
+use crate::base::err_utils::{encpasulate_error, new_err};
 use crate::base::RemoteConfig;
 use crate::tcp_relay_client::client_config::ClientConfig;
 use crate::tcp_relay_client::relay_client::relay_client;
@@ -27,7 +29,8 @@ async fn get_server_config(conf: &ClientConfig) -> Result<RemoteConfig, Box<dyn
 
     // Specify client certificate, if any
     if let Some(kp) = conf.get_merged_client_keypair() {
-        let identity = Identity::from_pem(&kp).expect("Failed to load certificates for reqwest!");
+        let identity = Identity::from_pem(&kp)
+            .map_err(|e| encpasulate_error(e, "Failed to load certificates for reqwest!"))?;
         client = client.identity(identity).use_rustls_tls();
     }
 
@@ -39,11 +42,13 @@ async fn get_server_config(conf: &ClientConfig) -> Result<RemoteConfig, Box<dyn
         .send()
         .await?;
     if req.status().as_u16() != 200 {
-        log::error!(
+        Err(std::io::Error::new(
-            "Could not retrieve configuration! (got status {})",
+            ErrorKind::Other,
-            req.status()
+            format!(
-        );
+                "Could not retrieve configuration! (got status {})",
-        std::process::exit(2);
+                req.status()
+            ),
+        ))?;
     }
 
     Ok(req.json::<RemoteConfig>().await?)
@@ -51,15 +56,14 @@ async fn get_server_config(conf: &ClientConfig) -> Result<RemoteConfig, Box<dyn
 
 /// Core logic of the application
 pub async fn run_app(mut args: ClientConfig) -> std::io::Result<()> {
-    args.load_certificates();
+    args.load_certificates()?;
     let args = Arc::new(args);
 
     // Check arguments coherence
     if args.tls_cert.is_some() != args.tls_key.is_some() {
-        log::error!(
+        return Err(new_err(
-            "If you specify one of TLS certificate / key, you must then specify the other!"
+            "If you specify one of TLS certificate / key, you must then specify the other!",
-        );
+        ));
-        panic!();
     }
 
     if args.get_client_keypair().is_some() {
@@ -70,8 +74,11 @@ pub async fn run_app(mut args: ClientConfig) -> std::io::Result<()> {
     let remote_conf = match get_server_config(&args).await {
         Ok(c) => c,
         Err(e) => {
-            log::error!("Failed to fetch relay configuration from server! {}", e);
+            Err(std::io::Error::new(
-            panic!();
+                ErrorKind::Other,
+                format!("Failed to fetch relay configuration from server! {}", e),
+            ))?;
+            unreachable!();
         }
     };
 
@@ -87,7 +94,7 @@ pub async fn run_app(mut args: ClientConfig) -> std::io::Result<()> {
                 port.id,
                 urlencoding::encode(args.get_auth_token())
             )
-            .replace("http", "ws"),
+                .replace("http", "ws"),
             listen_address,
             args.clone(),
         ));

src/tcp_relay_server/mod.rs

@@ -3,8 +3,8 @@ use std::sync::Arc;
 use actix_web::web::Data;
 use actix_web::{middleware, web, App, HttpRequest, HttpResponse, HttpServer, Responder};
 
+use crate::base::err_utils::{encpasulate_error, new_err};
 use crate::base::{cert_utils, RelayedPort};
-
 use crate::tcp_relay_server::relay_ws::relay_ws;
 use crate::tcp_relay_server::server_config::ServerConfig;
 use crate::tcp_relay_server::tls_cert_client_verifier::CustomCertClientVerifier;
@@ -47,27 +47,30 @@ pub async fn config_route(req: HttpRequest, data: Data<Arc<ServerConfig>>) -> im
 pub async fn run_app(mut config: ServerConfig) -> std::io::Result<()> {
     // Check if no port are to be forwarded
     if config.ports.is_empty() {
-        log::error!("No port to forward!");
+        return Err(new_err("No port to forward!"));
-        std::process::exit(2);
     }
 
     // Read tokens from file, if any
     if let Some(file) = &config.tokens_file {
         std::fs::read_to_string(file)
-            .expect("Failed to read tokens file!")
+            .map_err(|e| encpasulate_error(e, "Failed to read tokens file!"))?
             .split('\n')
             .filter(|l| !l.is_empty())
             .for_each(|t| config.tokens.push(t.to_string()));
     }
 
     if !config.has_auth() {
-        log::error!("No authentication method specified!");
+        return Err(new_err("No authentication method specified!"));
-        std::process::exit(3);
+    }
+
+    if config.tls_cert.is_some() != config.tls_key.is_some() {
+        return Err(new_err("Incomplete server TLS configuration!"));
     }
 
     if config.has_tls_client_auth() && !config.has_tls_config() {
-        log::error!("Cannot provide client auth without TLS configuration!");
+        return Err(new_err(
-        panic!();
+            "Cannot provide client auth without TLS configuration!",
+        ));
     }
 
     let args = Arc::new(config);
@@ -75,22 +78,24 @@ pub async fn run_app(mut config: ServerConfig) -> std::io::Result<()> {
     // Load TLS configuration, if any
     let tls_config = if let (Some(cert), Some(key)) = (&args.tls_cert, &args.tls_key) {
         // Load TLS certificate & private key
-        let cert_file = std::fs::read(cert).expect("Failed to read certificate file");
+        let cert_file = std::fs::read(cert)
-        let key_file = std::fs::read(key).expect("Failed to read server private key");
+            .map_err(|e| encpasulate_error(e, "Failed to read certificate file"))?;
+        let key_file = std::fs::read(key)
+            .map_err(|e| encpasulate_error(e, "Failed to read server private key"))?;
 
         // Get certificates chain
-        let cert_chain =
+        let cert_chain = cert_utils::parse_pem_certificates(&cert_file)
-            cert_utils::parse_pem_certificates(&cert_file).expect("Failed to extract certificates");
+            .map_err(|e| encpasulate_error(e, "Failed to extract certificates"))?;
 
         // Get private key
-        let key =
+        let key = cert_utils::parse_pem_private_key(&key_file)
-            cert_utils::parse_pem_private_key(&key_file).expect("Failed to extract private key!");
+            .map_err(|e| encpasulate_error(e, "Failed to extract private key!"))?;
 
         let config = rustls::ServerConfig::builder().with_safe_defaults();
 
         let config = match args.has_tls_client_auth() {
             true => config
-                .with_client_cert_verifier(Arc::new(CustomCertClientVerifier::new(args.clone()))),
+                .with_client_cert_verifier(Arc::new(CustomCertClientVerifier::new(args.clone())?)),
             false => config.with_no_client_auth(),
         };
 

src/tcp_relay_server/server_config.rs

@@ -74,7 +74,7 @@ impl ServerConfig {
 
 #[cfg(test)]
 mod test {
-    use crate::server_config::ServerConfig;
+    use crate::tcp_relay_server::server_config::ServerConfig;
 
     #[test]
     fn verify_cli() {

src/tcp_relay_server/tls_cert_client_verifier.rs

@@ -7,7 +7,7 @@ use rustls::{Certificate, DistinguishedNames, Error, RootCertStore};
 use x509_parser::prelude::{CertificateRevocationList, FromDer, X509Certificate};
 
 use crate::base::cert_utils::parse_pem_certificates;
-
+use crate::base::err_utils::{encpasulate_error, new_err};
 use crate::tcp_relay_server::server_config::ServerConfig;
 
 pub struct CustomCertClientVerifier {
@@ -16,21 +16,28 @@ pub struct CustomCertClientVerifier {
 }
 
 impl CustomCertClientVerifier {
-    pub fn new(conf: Arc<ServerConfig>) -> Self {
+    pub fn new(conf: Arc<ServerConfig>) -> std::io::Result<Self> {
         // Build root certifications list
         let cert_path = conf
             .tls_client_auth_root_cert
             .as_deref()
             .expect("No root certificates for client authentication provided!");
-        let cert_file = std::fs::read(cert_path)
+        let cert_file = std::fs::read(cert_path).map_err(|e| {
-            .expect("Failed to read root certificates for client authentication!");
+            encpasulate_error(
+                e,
+                "Failed to read root certificates for client authentication!",
+            )
+        })?;
 
-        let root_certs = parse_pem_certificates(&cert_file)
+        let root_certs = parse_pem_certificates(&cert_file).map_err(|e| {
-            .expect("Failed to read root certificates for server authentication!");
+            encpasulate_error(
+                e,
+                "Failed to read root certificates for server authentication!",
+            )
+        })?;
 
         if root_certs.is_empty() {
-            log::error!("No certificates found for client authentication!");
+            return Err(new_err("No certificates found for client authentication!"));
-            panic!();
         }
 
         let mut store = RootCertStore::empty();
@@ -42,19 +49,21 @@ impl CustomCertClientVerifier {
 
         // Parse CRL file (if any)
         let crl = if let Some(crl_file) = &conf.tls_revocation_list {
-            let crl_file = std::fs::read(crl_file).expect("Failed to open / read CRL file!");
+            let crl_file = std::fs::read(crl_file)
+                .map_err(|e| encpasulate_error(e, "Failed to open / read CRL file!"))?;
 
-            let parsed_crl = pem::parse(crl_file).expect("Failed to decode CRL file!");
+            let parsed_crl = pem::parse(crl_file)
+                .map_err(|e| encpasulate_error(e, "Failed to decode CRL file!"))?;
 
             Some(parsed_crl.contents)
         } else {
             None
         };
 
-        Self {
+        Ok(Self {
             upstream_cert_verifier: Box::new(AllowAnyAuthenticatedClient::new(store)),
             crl,
-        }
+        })
     }
 }
 

src/test/client_invalid_tls_configuration.rs

@@ -0,0 +1,159 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::{BAD_PATH, get_port_number, LOCALHOST_IP, PortsAllocation};
+use crate::test::dummy_tcp_sockets::wait_for_port;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ClientInvalidTlsConfiguration, index)
+}
+
+#[tokio::test()]
+async fn random_file_for_cert() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(random_file.to_string_lossy().to_string()),
+        tls_key: Some(pki.valid_client_key.file_path()),
+        ..Default::default()
+    })
+        .await
+        .unwrap_err();
+}
+
+#[tokio::test()]
+async fn random_file_for_key() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(pki.valid_client_crt.file_path()),
+        tls_key: Some(random_file.to_string_lossy().to_string()),
+        ..Default::default()
+    })
+        .await
+        .unwrap_err();
+}
+
+#[tokio::test()]
+async fn bad_pem_file_for_cert() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(pki.root_ca_crl.file_path()),
+        tls_key: Some(pki.valid_client_key.file_path()),
+        ..Default::default()
+    })
+        .await
+        .unwrap_err();
+}
+
+#[tokio::test()]
+async fn bad_pem_file_for_key() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(pki.valid_client_crt.file_path()),
+        tls_key: Some(pki.root_ca_crl.file_path()),
+        ..Default::default()
+    })
+        .await
+        .unwrap_err();
+}
+
+#[tokio::test()]
+async fn non_existing_cert() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(BAD_PATH.to_string()),
+        tls_key: Some(pki.valid_client_key.file_path()),
+        ..Default::default()
+    })
+        .await
+        .unwrap_err();
+}
+
+#[tokio::test()]
+async fn non_existing_key() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some("token".to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        tls_cert: Some(pki.valid_client_crt.file_path()),
+        tls_key: Some(BAD_PATH.to_string()),
+        ..Default::default()
+    })
+        .await
+        .unwrap_err();
+}
+
+#[tokio::test()]
+async fn unmatched_key_cert_pair() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec!["dqsd".to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: Some(pki.root_ca_crt.file_path()),
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some("token".to_string()),
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                tls_cert: Some(pki.valid_client_crt.file_path()),
+                tls_key: Some(pki.revoked_client_key.file_path()),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                ..Default::default()
+            })
+                .await
+                .unwrap_err();
+        }).await;
+}

src/test/client_invalid_tls_root_certificate_file.rs

@@ -0,0 +1,59 @@
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::test::{BAD_PATH, get_port_number, LOCALHOST_IP, PortsAllocation};
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test()]
+async fn invalid_file_type() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some(VALID_TOKEN.to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        root_certificate: Some(pki.expired_client_key.file_path()),
+        ..Default::default()
+    })
+        .await
+        .unwrap_err();
+}
+
+#[tokio::test()]
+async fn non_existing_file() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some(VALID_TOKEN.to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        root_certificate: Some(BAD_PATH.to_string()),
+        ..Default::default()
+    })
+        .await
+        .unwrap_err();
+}
+
+#[tokio::test()]
+async fn random_file() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_client::run_app(ClientConfig {
+        token: Some(VALID_TOKEN.to_string()),
+        relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+        listen_address: LOCALHOST_IP.to_string(),
+        root_certificate: Some(random_file.to_string_lossy().to_string()),
+        ..Default::default()
+    })
+        .await
+        .unwrap_err();
+}

src/test/client_try_tls_while_there_is_no_tls.rs

@@ -0,0 +1,55 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{wait_for_port, DummyTCPServer};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ClientTryTLSWhileThereIsNoTLS, index)
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("https://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/dummy_tcp_sockets.rs

@@ -0,0 +1,339 @@
+use std::time::Duration;
+
+use rand::Rng;
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use tokio::net::{TcpListener, TcpStream};
+use tokio::time;
+
+use crate::test::LOCALHOST_IP;
+
+pub struct DummyTCPServer(TcpListener);
+
+impl DummyTCPServer {
+    pub async fn start(port: u16) -> Self {
+        let addr = format!("{}:{}", LOCALHOST_IP, port);
+        println!("[DUMMY TCP] Listen on {}", addr);
+        let listener = TcpListener::bind(addr)
+            .await
+            .expect("Failed to bind dummy TCP listener!");
+        Self(listener)
+    }
+
+    /// Receive chunk of data from following connection
+    pub async fn read_next_connection(&self) -> Vec<u8> {
+        let (mut conn, _addr) = self
+            .0
+            .accept()
+            .await
+            .expect("Could not open next connection!");
+
+        let mut buff = Vec::with_capacity(100);
+        conn.read_to_end(&mut buff).await.unwrap();
+
+        buff
+    }
+
+    /// Receive chunk of data from following connection
+    pub async fn read_then_write_next_connection(&self, to_send: &[u8]) -> Vec<u8> {
+        let (mut conn, _addr) = self
+            .0
+            .accept()
+            .await
+            .expect("Could not open next connection!");
+
+        let mut buff: [u8; 100] = [0; 100];
+        let size = conn.read(&mut buff).await.unwrap();
+
+        conn.write_all(to_send).await.unwrap();
+
+        buff[0..size].to_vec()
+    }
+
+    /// Receive chunk of data from following connection
+    pub async fn write_next_connection(&self, to_send: &[u8]) {
+        let (mut conn, _addr) = self
+            .0
+            .accept()
+            .await
+            .expect("Could not open next connection!");
+
+        conn.write_all(to_send).await.unwrap()
+    }
+
+    /// Perform complex exchange: receive numbers from client and respond with their square
+    pub async fn next_conn_square_operations(&self) {
+        let (mut conn, _addr) = self
+            .0
+            .accept()
+            .await
+            .expect("Could not open next connection!");
+
+        let mut buff: [u8; 100] = [0; 100];
+        loop {
+            let size = conn.read(&mut buff).await.unwrap();
+            if size == 0 {
+                break;
+            }
+
+            let content = String::from_utf8_lossy(&buff[0..size])
+                .to_string()
+                .parse::<i64>()
+                .unwrap();
+
+            conn.write_all((content * content).to_string().as_bytes())
+                .await
+                .unwrap();
+        }
+    }
+
+    pub async fn loop_conn_square_operations(&self) {
+        loop {
+            self.next_conn_square_operations().await
+        }
+    }
+
+    /// Perform complex exchange: receive numbers from client and respond with their value + a given number
+    pub async fn next_conn_add_operations(&self, inc: i32) {
+        let (mut conn, _addr) = self
+            .0
+            .accept()
+            .await
+            .expect("Could not open next connection!");
+
+        let mut buff: [u8; 100] = [0; 100];
+        loop {
+            let size = conn.read(&mut buff).await.unwrap();
+            if size == 0 {
+                break;
+            }
+
+            let content = String::from_utf8_lossy(&buff[0..size])
+                .to_string()
+                .parse::<i64>()
+                .unwrap();
+
+            conn.write_all((content + inc as i64).to_string().as_bytes())
+                .await
+                .unwrap();
+        }
+    }
+
+    pub async fn loop_next_conn_add_operations(&self, inc: i32) {
+        loop {
+            self.next_conn_add_operations(inc).await
+        }
+    }
+}
+
+pub async fn dummy_tcp_client_read_conn(port: u16) -> Vec<u8> {
+    let mut socket = TcpStream::connect(format!("127.0.0.1:{}", port))
+        .await
+        .expect("Failed to connect to dummy TCP server!");
+
+    let mut buff: [u8; 100] = [0; 100];
+    let size = socket.read(&mut buff).await.unwrap();
+
+    buff[0..size].to_vec()
+}
+
+pub async fn dummy_tcp_client_write_then_read_conn(port: u16, data: &[u8]) -> Vec<u8> {
+    let mut socket = TcpStream::connect(format!("127.0.0.1:{}", port))
+        .await
+        .expect("Failed to connect to dummy TCP server!");
+
+    socket.write_all(data).await.unwrap();
+
+    let mut buff: [u8; 100] = [0; 100];
+    let size = socket.read(&mut buff).await.unwrap();
+
+    buff[0..size].to_vec()
+}
+
+pub async fn dummy_tcp_client_write_conn(port: u16, data: &[u8]) {
+    let mut socket = TcpStream::connect(format!("127.0.0.1:{}", port))
+        .await
+        .expect("Failed to connect to dummy TCP server!");
+
+    socket.write_all(data).await.unwrap()
+}
+
+pub async fn dummy_tcp_client_square_root_requests(port: u16, num_exchanges: usize) {
+    let mut socket = TcpStream::connect(format!("127.0.0.1:{}", port))
+        .await
+        .expect("Failed to connect to dummy TCP server!");
+
+    let mut rng = rand::thread_rng();
+    let mut buff: [u8; 100] = [0; 100];
+
+    for _ in 0..num_exchanges {
+        let num = rng.gen::<i32>() % 100;
+        socket.write_all(num.to_string().as_bytes()).await.unwrap();
+
+        let size = socket.read(&mut buff).await.unwrap();
+
+        if size == 0 {
+            panic!("Got empty response!");
+        }
+
+        let got = String::from_utf8_lossy(&buff[0..size])
+            .to_string()
+            .parse::<i64>()
+            .unwrap();
+        println!("{} * {} = {} (based on server response)", num, num, got);
+        assert_eq!((num * num) as i64, got);
+    }
+}
+
+pub async fn dummy_tcp_client_additions_requests(port: u16, inc: i32, num_exchanges: usize) {
+    let mut socket = TcpStream::connect(format!("127.0.0.1:{}", port))
+        .await
+        .expect("Failed to connect to dummy TCP server!");
+
+    let mut rng = rand::thread_rng();
+    let mut buff: [u8; 100] = [0; 100];
+
+    for _ in 0..num_exchanges {
+        let num = rng.gen::<i32>() % 100;
+        socket.write_all(num.to_string().as_bytes()).await.unwrap();
+
+        let size = socket.read(&mut buff).await.unwrap();
+
+        if size == 0 {
+            panic!("Got empty response!");
+        }
+
+        let got = String::from_utf8_lossy(&buff[0..size])
+            .to_string()
+            .parse::<i64>()
+            .unwrap();
+        println!("{} + {} = {} (based on server response)", num, inc, got);
+        assert_eq!((num + inc) as i64, got);
+    }
+}
+
+/// Check whether a given port is open or not
+pub async fn is_port_open(port: u16) -> bool {
+    match TcpStream::connect(("127.0.0.1", port)).await {
+        Ok(_) => true,
+        Err(_) => false,
+    }
+}
+
+/// Wait for a port to become available
+pub async fn wait_for_port(port: u16) {
+    for _ in 0..50 {
+        if is_port_open(port).await {
+            return;
+        }
+        time::sleep(Duration::from_millis(10)).await;
+    }
+
+    eprintln!("Port {} did not open in time!", port);
+    std::process::exit(2);
+}
+
+mod test {
+    use crate::test::dummy_tcp_sockets::{
+        dummy_tcp_client_additions_requests, dummy_tcp_client_read_conn,
+        dummy_tcp_client_square_root_requests, dummy_tcp_client_write_conn,
+        dummy_tcp_client_write_then_read_conn, DummyTCPServer,
+    };
+    use crate::test::{get_port_number, PortsAllocation};
+
+    fn port(index: u16) -> u16 {
+        get_port_number(PortsAllocation::DummyTCPServer, index)
+    }
+
+    #[tokio::test]
+    async fn socket_read_from_server() {
+        const DATA: &[u8] = "Hello world!!!".as_bytes();
+
+        let listener = DummyTCPServer::start(port(0)).await;
+        let handle = tokio::spawn(async move {
+            listener.write_next_connection(DATA).await;
+        });
+        let data = dummy_tcp_client_read_conn(port(0)).await;
+        assert_eq!(data, DATA);
+
+        handle.await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn socket_write_to_server() {
+        const DATA: &[u8] = "Hello world 2".as_bytes();
+
+        let listener = DummyTCPServer::start(port(1)).await;
+        tokio::spawn(async move {
+            dummy_tcp_client_write_conn(port(1), DATA).await;
+        });
+        let data = listener.read_next_connection().await;
+        assert_eq!(data, DATA);
+    }
+
+    #[tokio::test]
+    async fn socket_read_and_write_to_server() {
+        const DATA_1: &[u8] = "Hello world 3a".as_bytes();
+        const DATA_2: &[u8] = "Hello world 3b".as_bytes();
+
+        let listener = DummyTCPServer::start(port(2)).await;
+        let handle = tokio::spawn(async move {
+            println!("client handle");
+            let data = dummy_tcp_client_write_then_read_conn(port(2), DATA_1).await;
+            assert_eq!(data, DATA_2);
+        });
+        let h2 = tokio::spawn(async move {
+            println!("server handle");
+            let data = listener.read_then_write_next_connection(DATA_2).await;
+            assert_eq!(data, DATA_1);
+        });
+
+        handle.await.unwrap();
+        h2.await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn socket_dummy_root_calculator() {
+        let listener = DummyTCPServer::start(port(3)).await;
+        let handle = tokio::spawn(async move {
+            listener.next_conn_square_operations().await;
+        });
+        let data = dummy_tcp_client_write_then_read_conn(port(3), "5".as_bytes()).await;
+        assert_eq!(data, "25".as_bytes());
+
+        handle.await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn socket_dummy_root_calculator_multiple() {
+        let listener = DummyTCPServer::start(port(4)).await;
+        let handle = tokio::spawn(async move {
+            listener.next_conn_square_operations().await;
+        });
+        dummy_tcp_client_square_root_requests(port(4), 10).await;
+
+        handle.await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn socket_dummy_addition_calculator() {
+        let listener = DummyTCPServer::start(port(5)).await;
+        let handle = tokio::spawn(async move {
+            listener.next_conn_add_operations(4).await;
+        });
+        let data = dummy_tcp_client_write_then_read_conn(port(5), "5".as_bytes()).await;
+        assert_eq!(data, "9".as_bytes());
+
+        handle.await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn socket_dummy_addition_calculator_multiple() {
+        let listener = DummyTCPServer::start(port(6)).await;
+        let handle = tokio::spawn(async move {
+            listener.next_conn_add_operations(7).await;
+        });
+        dummy_tcp_client_additions_requests(port(6), 7, 10).await;
+
+        handle.await.unwrap();
+    }
+}

src/test/invalid_with_token_auth.rs

@@ -0,0 +1,57 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{wait_for_port, DummyTCPServer};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+const INVALID_TOKEN: &str = "AnInvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::InvalidWithTokenAuth, index)
+}
+
+#[tokio::test()]
+async fn invalid_with_token_auth() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    tokio::spawn(async move {
+        // Start internal service
+        let local_server = DummyTCPServer::start(port(1)).await;
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(INVALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/mod.rs

@@ -0,0 +1,54 @@
+#[non_exhaustive]
+enum PortsAllocation {
+    TestsWithoutPortOpened,
+    DummyTCPServer,
+    ValidWithTokenAuth,
+    ValidWithTLSAuth,
+    InvalidWithTokenAuth,
+    ValidWithMultipleTokenAuth,
+    ValidWithTokenFile,
+    ClientTryTLSWhileThereIsNoTLS,
+    ValidTokenWithCustomIncrement,
+    ValidWithTokenAuthMultiplePorts,
+    ValidWithTokenAuthAndServerTLS,
+    WithTokenAuthAndInvalidServerTLSBadCA,
+    WithTokenAuthAndInvalidServerTLSExpiredAndBadCN,
+    TlsAuthExpiredClientCertificate,
+    TlsAuthRevokedClientCertificate,
+    TlsAuthInvalidClientCertificate,
+    ClientInvalidTlsConfiguration,
+}
+
+fn get_port_number(alloc: PortsAllocation, index: u16) -> u16 {
+    30000 + 20 * (alloc as u16) + index
+}
+
+const LOCALHOST_IP: &str = "127.0.0.1";
+const BAD_PATH: &str = "/bad/path/to/key/file";
+
+mod dummy_tcp_sockets;
+mod pki;
+mod test_files_utils;
+
+mod client_invalid_tls_root_certificate_file;
+mod client_try_tls_while_there_is_no_tls;
+mod client_invalid_tls_configuration;
+mod invalid_with_token_auth;
+mod server_invalid_tls_config_invalid_cert;
+mod server_invalid_tls_config_invalid_client_crl;
+mod server_invalid_tls_config_invalid_client_root_cert;
+mod server_invalid_tls_config_invalid_key;
+mod server_invalid_token_file;
+mod server_missing_auth;
+mod tls_auth_expired_certificate;
+mod tls_auth_invalid_certificate;
+mod tls_auth_revoked_certificate;
+mod valid_token_with_custom_increment;
+mod valid_with_multiple_token_auth;
+mod valid_with_tls_auth;
+mod valid_with_token_auth;
+mod valid_with_token_auth_and_server_tls;
+mod valid_with_token_auth_multiple_ports;
+mod valid_with_token_file;
+mod with_token_auth_and_invalid_server_tls_bad_ca;
+mod with_token_auth_and_invalid_server_tls_expired_and_bad_cn;

src/test/pki.rs

@@ -0,0 +1,53 @@
+use mktemp::Temp;
+
+use crate::test::test_files_utils::create_temp_file_with_content;
+
+pub struct PemHolder(Temp);
+
+impl PemHolder {
+    fn new(b: &[u8]) -> Self {
+        Self(create_temp_file_with_content(b))
+    }
+
+    pub fn file_path(&self) -> String {
+        self.0.to_str().unwrap().to_string()
+    }
+}
+
+pub struct Pki {
+    pub expired_client_key: PemHolder,
+    pub expired_client_crt: PemHolder,
+    pub localhost_crt: PemHolder,
+    pub localhost_key: PemHolder,
+    pub other_ca_crl: PemHolder,
+    pub other_ca_crt: PemHolder,
+    pub other_ca_key: PemHolder,
+    pub revoked_client_crt: PemHolder,
+    pub revoked_client_key: PemHolder,
+    pub root_ca_crl: PemHolder,
+    pub root_ca_crt: PemHolder,
+    pub root_ca_key: PemHolder,
+    pub valid_client_crt: PemHolder,
+    pub valid_client_key: PemHolder,
+}
+
+impl Pki {
+    pub fn load() -> Self {
+        Self {
+            expired_client_key: PemHolder::new(include_bytes!("test_pki/ExpiredClient.key")),
+            expired_client_crt: PemHolder::new(include_bytes!("test_pki/ExpiredClient.crt")),
+            localhost_crt: PemHolder::new(include_bytes!("test_pki/localhost.crt")),
+            localhost_key: PemHolder::new(include_bytes!("test_pki/localhost.key")),
+            other_ca_crl: PemHolder::new(include_bytes!("test_pki/OtherCA.crl")),
+            other_ca_crt: PemHolder::new(include_bytes!("test_pki/OtherCA.crt")),
+            other_ca_key: PemHolder::new(include_bytes!("test_pki/OtherCA.key")),
+            revoked_client_crt: PemHolder::new(include_bytes!("test_pki/RevokedClient.crt")),
+            revoked_client_key: PemHolder::new(include_bytes!("test_pki/RevokedClient.key")),
+            root_ca_crl: PemHolder::new(include_bytes!("test_pki/TCPTunnelTestCA.crl")),
+            root_ca_crt: PemHolder::new(include_bytes!("test_pki/TCPTunnelTestCA.crt")),
+            root_ca_key: PemHolder::new(include_bytes!("test_pki/TCPTunnelTestCA.key")),
+            valid_client_crt: PemHolder::new(include_bytes!("test_pki/ValidClient.crt")),
+            valid_client_key: PemHolder::new(include_bytes!("test_pki/ValidClient.key")),
+        }
+    }
+}

src/test/server_invalid_tls_config_invalid_cert.rs

@@ -0,0 +1,100 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+use crate::test::{get_port_number, PortsAllocation, BAD_PATH};
+
+const TOKEN: &str = "mytok";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test]
+async fn unspecified() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: None,
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn incorrect_pem_type() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.root_ca_crl.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn random_contents() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(random_file.to_string_lossy().to_string()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn invalid_path() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(BAD_PATH.to_string()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}

src/test/server_invalid_tls_config_invalid_client_crl.rs

@@ -0,0 +1,78 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+use crate::test::{get_port_number, PortsAllocation, BAD_PATH};
+
+const TOKEN: &str = "mytok";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test]
+async fn bad_path() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(pki.root_ca_crl.file_path()),
+        tls_revocation_list: Some(BAD_PATH.to_string()),
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn random_content() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(pki.root_ca_crl.file_path()),
+        tls_revocation_list: Some(random_file.to_string_lossy().to_string()),
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn invalid_pem() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(pki.root_ca_crl.file_path()),
+        tls_revocation_list: Some(pki.root_ca_crt.file_path()),
+    })
+    .await
+    .unwrap_err();
+}

src/test/server_invalid_tls_config_invalid_client_root_cert.rs

@@ -0,0 +1,78 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+use crate::test::{get_port_number, PortsAllocation, BAD_PATH};
+
+const TOKEN: &str = "mytok";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test]
+async fn invalid_path() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(BAD_PATH.to_string()),
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn other_pem_file_type() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(pki.root_ca_crl.file_path()),
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn random_content() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let random_file = create_temp_file_with_random_content();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: Some(random_file.to_string_lossy().to_string()),
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}

src/test/server_invalid_tls_config_invalid_key.rs

@@ -0,0 +1,100 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::pki::Pki;
+use crate::test::test_files_utils::create_temp_file_with_random_content;
+use crate::test::{get_port_number, PortsAllocation, BAD_PATH};
+
+const TOKEN: &str = "mytok";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test]
+async fn invalid_pem_file_type() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.root_ca_crt.file_path()),
+        tls_key: Some(pki.root_ca_crt.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test()]
+async fn unspecified() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.root_ca_crt.file_path()),
+        tls_key: None,
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn random_content() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let random_content = create_temp_file_with_random_content();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.root_ca_crt.file_path()),
+        tls_key: Some(random_content.to_string_lossy().to_string()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn invalid_path() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![TOKEN.to_string()],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.localhost_crt.file_path()),
+        tls_key: Some(BAD_PATH.to_string()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}

src/test/server_invalid_token_file.rs

@@ -0,0 +1,28 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::{get_port_number, PortsAllocation};
+
+const INVALID_TOKEN: &str = "/tmp/a/token/file/that/does/not/exists";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![],
+        tokens_file: Some(INVALID_TOKEN.to_string()),
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: None,
+        tls_key: None,
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}

src/test/server_missing_auth.rs

@@ -0,0 +1,71 @@
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TestsWithoutPortOpened, index)
+}
+
+#[tokio::test]
+async fn with_tls_server() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: Some(pki.root_ca_crl.file_path()),
+        tls_key: Some(pki.localhost_key.file_path()),
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn without_tls_server() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: None,
+        tls_key: None,
+        tls_client_auth_root_cert: None,
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}
+
+#[tokio::test]
+async fn tls_auth_without_tls_config() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    crate::tcp_relay_server::run_app(ServerConfig {
+        tokens: vec![],
+        tokens_file: None,
+        ports: vec![port(1)],
+        upstream_server: "127.0.0.1".to_string(),
+        listen_address: format!("127.0.0.1:{}", port(0)),
+        increment_ports: 1,
+        tls_cert: None,
+        tls_key: None,
+        tls_client_auth_root_cert: Some(pki.root_ca_crt.file_path()),
+        tls_revocation_list: None,
+    })
+    .await
+    .unwrap_err();
+}

src/test/test_files_utils.rs

@@ -0,0 +1,17 @@
+use mktemp::Temp;
+use rand::Rng;
+
+/// Create a temporary file and feed it with some specified content
+pub fn create_temp_file_with_content(content: &[u8]) -> Temp {
+    let temp = Temp::new_file().unwrap();
+    std::fs::write(&temp, content).unwrap();
+    temp
+}
+
+/// Generate a temporary file with some random content
+pub fn create_temp_file_with_random_content() -> Temp {
+    let random_bytes = rand::thread_rng().gen::<[u8; 10]>();
+    let temp = Temp::new_file().unwrap();
+    std::fs::write(&temp, random_bytes).unwrap();
+    temp
+}

src/test/test_pki/ExpiredClient.crt

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
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+AKio0jBH1mENEttHndQhXQkE
+-----END CERTIFICATE-----

src/test/test_pki/ExpiredClient.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEA0NMicawMnjGr+lKel5MNIToHZn/8dp3RZCRaXrPiTpbm3v3E
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+fpFdGYs8KeohUfw8LSf95VwJwSBb3zjaPPTR/ZZ+LI3k8wStXlOMiQ==
+-----END RSA PRIVATE KEY-----

src/test/test_pki/OtherCA.crl

@@ -0,0 +1,16 @@
+-----BEGIN X509 CRL-----
+MIICgTBrAgEBMA0GCSqGSIb3DQEBCwUAMBIxEDAOBgNVBAMTB090aGVyQ0EXDTIy
+MDkwMjA3MTI0MloXDTQyMDkwMjA3MTI0MFowAKAjMCEwHwYDVR0jBBgwFoAUIdv7
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+e5zdMjCWD7b5jfM0GpSthrfh7cya
+-----END X509 CRL-----

src/test/test_pki/OtherCA.crt

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
+MIIE5DCCAsygAwIBAgIBATANBgkqhkiG9w0BAQsFADASMRAwDgYDVQQDEwdPdGhl
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+-----END CERTIFICATE-----

src/test/test_pki/OtherCA.key

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

src/test/test_pki/RevokedClient.crt

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

src/test/test_pki/RevokedClient.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

src/test/test_pki/TCPTunnelTestCA.crl

@@ -0,0 +1,17 @@
+-----BEGIN X509 CRL-----
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+-----END X509 CRL-----

src/test/test_pki/TCPTunnelTestCA.crt

@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

src/test/test_pki/TCPTunnelTestCA.key

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

src/test/test_pki/ValidClient.crt

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
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+JXXeqkcOvTFHibpLR5lQ1Q==
+-----END CERTIFICATE-----

src/test/test_pki/ValidClient.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpgIBAAKCAQEAneTyMKf0FAN1FRwxywUGp5Mg0zskMUsykegmzsodoZE7P5e/
+HiNinsKL2ID+KKMEbB2FEzXGRwQSpt3xOgaGTlbkINE8NduqKSeVhDue5z6Hqp/0
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+n82eXRq0ij6ggvXHvfhxgpa51hCRtEv6MGNu5qJ9QGKxb8VAFbQT3vPI
+-----END RSA PRIVATE KEY-----

src/test/test_pki/localhost.crt

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
+MIIERzCCAi+gAwIBAgIQAtk0UZ5qjqGgxYWL7X9GhDANBgkqhkiG9w0BAQsFADAa
+MRgwFgYDVQQDEw9UQ1BUdW5uZWxUZXN0Q0EwHhcNMjIwOTAyMDcwNzUxWhcNNDIw
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+0TEp4yh/gUZ+YO3/XQmpDa1/3kojfhD+WcRQoZ5lwMrlwxtvmiOit4JJQA==
+-----END CERTIFICATE-----

src/test/test_pki/localhost.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEAy7mRJTarwDyIkwY1iSIw9SHvgJsNTL7FjGO1D+eqgnM5LxyO
+MHx0SfpgrFLGypykfJ2AwmtgoomaSP6Fg2XEGQVpjo2qHgSWo8OoPrIxZfpX7eMW
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+LtbdqXEoZPYd6dLbTPTe43Pnl45o4epC+46c678nP/TrtfnKAiL1SA==
+-----END RSA PRIVATE KEY-----

src/test/tls_auth_expired_certificate.rs

@@ -0,0 +1,58 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{wait_for_port, DummyTCPServer};
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TlsAuthExpiredClientCertificate, index)
+}
+
+#[tokio::test]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: Some(pki.root_ca_crt.file_path()),
+                tls_revocation_list: Some(pki.root_ca_crl.file_path()),
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                tls_cert: Some(pki.expired_client_crt.file_path()),
+                tls_key: Some(pki.valid_client_key.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/tls_auth_invalid_certificate.rs

@@ -0,0 +1,58 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{wait_for_port, DummyTCPServer};
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TlsAuthInvalidClientCertificate, index)
+}
+
+#[tokio::test]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: Some(pki.other_ca_crt.file_path()),
+                tls_revocation_list: Some(pki.other_ca_crl.file_path()),
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                tls_cert: Some(pki.revoked_client_crt.file_path()),
+                tls_key: Some(pki.revoked_client_key.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/tls_auth_revoked_certificate.rs

@@ -0,0 +1,58 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{wait_for_port, DummyTCPServer};
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::TlsAuthRevokedClientCertificate, index)
+}
+
+#[tokio::test]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: Some(pki.root_ca_crt.file_path()),
+                tls_revocation_list: Some(pki.root_ca_crl.file_path()),
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                tls_cert: Some(pki.revoked_client_crt.file_path()),
+                tls_key: Some(pki.revoked_client_key.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/valid_token_with_custom_increment.rs

@@ -0,0 +1,59 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidTokenWithCustomIncrement, index)
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 3,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            }));
+            wait_for_port(port(4)).await;
+
+            dummy_tcp_client_square_root_requests(port(4), 10).await;
+        })
+        .await;
+}

src/test/valid_with_multiple_token_auth.rs

@@ -0,0 +1,63 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithTokenFile, index)
+}
+
+#[tokio::test()]
+async fn valid_with_multiple_token_auth() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![
+                    "tok0".to_string(),
+                    VALID_TOKEN.to_string(),
+                    "tok2".to_string(),
+                ],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+        })
+        .await;
+}

src/test/valid_with_tls_auth.rs

@@ -0,0 +1,61 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithTLSAuth, index)
+}
+
+#[tokio::test]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: Some(pki.root_ca_crt.file_path()),
+                tls_revocation_list: Some(pki.root_ca_crl.file_path()),
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                tls_cert: Some(pki.valid_client_crt.file_path()),
+                tls_key: Some(pki.valid_client_key.file_path()),
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+        })
+        .await;
+}

src/test/valid_with_token_auth.rs

@@ -0,0 +1,59 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithTokenAuth, index)
+}
+
+#[tokio::test()]
+async fn valid_with_token_auth() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+        })
+        .await;
+}

src/test/valid_with_token_auth_and_server_tls.rs

@@ -0,0 +1,62 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithTokenAuthAndServerTLS, index)
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+        })
+        .await;
+}

src/test/valid_with_token_auth_multiple_ports.rs

@@ -0,0 +1,67 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_additions_requests, dummy_tcp_client_square_root_requests, wait_for_port,
+    DummyTCPServer,
+};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+const NUM_INC: i32 = 5;
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithTokenAuthMultiplePorts, index)
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal services
+    let local_server_1 = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server_1.loop_conn_square_operations().await;
+    });
+
+    let local_server_2 = DummyTCPServer::start(port(3)).await;
+    tokio::spawn(async move {
+        local_server_2.loop_next_conn_add_operations(NUM_INC).await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1), port(3)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+            dummy_tcp_client_additions_requests(port(4), NUM_INC, 10).await;
+        })
+        .await;
+}

src/test/valid_with_token_file.rs

@@ -0,0 +1,62 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::{
+    dummy_tcp_client_square_root_requests, wait_for_port, DummyTCPServer,
+};
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(PortsAllocation::ValidWithMultipleTokenAuth, index)
+}
+
+#[tokio::test()]
+async fn valid_with_token_file() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    // Start internal service
+    let local_server = DummyTCPServer::start(port(1)).await;
+    tokio::spawn(async move {
+        local_server.loop_conn_square_operations().await;
+    });
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            wait_for_port(port(1)).await;
+
+            let token_file = mktemp::Temp::new_file().unwrap();
+            std::fs::write(&token_file, format!("tok1\ntok2\n{}\ntok4", VALID_TOKEN)).unwrap();
+
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![],
+                tokens_file: Some(token_file.to_str().unwrap().to_string()),
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: None,
+                tls_key: None,
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            task::spawn(crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("http://{}:{}", LOCALHOST_IP, port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: None,
+                ..Default::default()
+            }));
+            wait_for_port(port(2)).await;
+
+            dummy_tcp_client_square_root_requests(port(2), 10).await;
+        })
+        .await;
+}

src/test/with_token_auth_and_invalid_server_tls_bad_ca.rs

@@ -0,0 +1,54 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::wait_for_port;
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(
+        PortsAllocation::WithTokenAuthAndInvalidServerTLSBadCA,
+        index,
+    )
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.localhost_crt.file_path()),
+                tls_key: Some(pki.localhost_key.file_path()),
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.other_ca_crt.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}

src/test/with_token_auth_and_invalid_server_tls_expired_and_bad_cn.rs

@@ -0,0 +1,54 @@
+use tokio::task;
+
+use crate::tcp_relay_client::client_config::ClientConfig;
+use crate::tcp_relay_server::server_config::ServerConfig;
+use crate::test::dummy_tcp_sockets::wait_for_port;
+use crate::test::pki::Pki;
+use crate::test::{get_port_number, PortsAllocation, LOCALHOST_IP};
+
+const VALID_TOKEN: &str = "AvalidTOKEN";
+
+fn port(index: u16) -> u16 {
+    get_port_number(
+        PortsAllocation::WithTokenAuthAndInvalidServerTLSExpiredAndBadCN,
+        index,
+    )
+}
+
+#[tokio::test()]
+async fn test() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let pki = Pki::load();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            // Start server relay
+            task::spawn_local(crate::tcp_relay_server::run_app(ServerConfig {
+                tokens: vec![VALID_TOKEN.to_string()],
+                tokens_file: None,
+                ports: vec![port(1)],
+                upstream_server: "127.0.0.1".to_string(),
+                listen_address: format!("127.0.0.1:{}", port(0)),
+                increment_ports: 1,
+                tls_cert: Some(pki.expired_client_crt.file_path()),
+                tls_key: Some(pki.expired_client_key.file_path()),
+                tls_client_auth_root_cert: None,
+                tls_revocation_list: None,
+            }));
+            wait_for_port(port(0)).await;
+
+            // Start client relay
+            crate::tcp_relay_client::run_app(ClientConfig {
+                token: Some(VALID_TOKEN.to_string()),
+                relay_url: format!("https://localhost:{}", port(0)),
+                listen_address: LOCALHOST_IP.to_string(),
+                root_certificate: Some(pki.root_ca_crt.file_path()),
+                ..Default::default()
+            })
+            .await
+            .unwrap_err();
+        })
+        .await;
+}