Implement server (#3)

Use Actix as HTTP service

Reviewed-on: #3

Cargo.toml

@@ -8,5 +8,16 @@ edition = "2021"
 [dependencies]
 log = "0.4.17"
 env_logger = "0.10.0"
-clap = {version="4.2.4", features=["derive", "env"]}
-lazy_static = "1.4.0"
+clap = { version = "4.2.4", features = ["derive", "env"] }
+lazy_static = "1.4.0"
+actix-web = "4.3.1"
+askama = "0.12.0"
+serde = { version = "1.0.160", features = ["derive"] }
+serde_json = "1.0.96"
+reqwest = { version = "0.11.16", features = ["json"] }
+urlencoding = "2.1.2"
+futures-util = "0.3.28"
+aes-gcm = "0.10.1"
+base64 = "0.21.0"
+rand = "0.8.5"
+bincode = {version="2.0.0-rc.3",features=["serde"]}

assets/cover.css

@@ -0,0 +1,127 @@
+/*
+ * Globals
+ */
+
+
+/* Custom default button */
+.btn-light,
+.btn-light:hover,
+.btn-light:focus {
+  color: #333;
+  text-shadow: none; /* Prevent inheritance from `body` */
+}
+
+
+/*
+ * Base structure
+ */
+
+body {
+  text-shadow: 0 .05rem .1rem rgba(0, 0, 0, .5);
+  box-shadow: inset 0 0 5rem rgba(0, 0, 0, .5);
+}
+
+.cover-container {
+  max-width: 42em;
+}
+
+
+main {
+    overflow-y: scroll;
+}
+
+/*
+ * Header
+ */
+
+.nav-masthead .nav-link {
+  color: rgba(255, 255, 255, .5);
+  border-bottom: .25rem solid transparent;
+}
+
+.nav-masthead .nav-link:hover,
+.nav-masthead .nav-link:focus {
+  border-bottom-color: rgba(255, 255, 255, .25);
+}
+
+.nav-masthead .nav-link + .nav-link {
+  margin-left: 1rem;
+}
+
+.nav-masthead .active {
+  color: #fff;
+  border-bottom-color: #fff;
+}
+
+
+.bd-placeholder-img {
+        font-size: 1.125rem;
+        text-anchor: middle;
+        -webkit-user-select: none;
+        -moz-user-select: none;
+        user-select: none;
+  }
+
+  @media (min-width: 768px) {
+    .bd-placeholder-img-lg {
+      font-size: 3.5rem;
+    }
+  }
+
+  .b-example-divider {
+    width: 100%;
+    height: 3rem;
+    background-color: rgba(0, 0, 0, .1);
+    border: solid rgba(0, 0, 0, .15);
+    border-width: 1px 0;
+    box-shadow: inset 0 .5em 1.5em rgba(0, 0, 0, .1), inset 0 .125em .5em rgba(0, 0, 0, .15);
+  }
+
+  .b-example-vr {
+    flex-shrink: 0;
+    width: 1.5rem;
+    height: 100vh;
+  }
+
+  .bi {
+    vertical-align: -.125em;
+    fill: currentColor;
+  }
+
+  .nav-scroller {
+    position: relative;
+    z-index: 2;
+    height: 2.75rem;
+    overflow-y: hidden;
+  }
+
+  .nav-scroller .nav {
+    display: flex;
+    flex-wrap: nowrap;
+    padding-bottom: 1rem;
+    margin-top: -1px;
+    overflow-x: auto;
+    text-align: center;
+    white-space: nowrap;
+    -webkit-overflow-scrolling: touch;
+  }
+
+  .btn-bd-primary {
+    --bd-violet-bg: #712cf9;
+    --bd-violet-rgb: 112.520718, 44.062154, 249.437846;
+
+    --bs-btn-font-weight: 600;
+    --bs-btn-color: var(--bs-white);
+    --bs-btn-bg: var(--bd-violet-bg);
+    --bs-btn-border-color: var(--bd-violet-bg);
+    --bs-btn-hover-color: var(--bs-white);
+    --bs-btn-hover-bg: #6528e0;
+    --bs-btn-hover-border-color: #6528e0;
+    --bs-btn-focus-shadow-rgb: var(--bd-violet-rgb);
+    --bs-btn-active-color: var(--bs-btn-hover-color);
+    --bs-btn-active-bg: #5a23c8;
+    --bs-btn-active-border-color: #5a23c8;
+  }
+  .bd-mode-toggle {
+    z-index: 1500;
+  }

src/app_config.rs

@@ -0,0 +1,58 @@
+use clap::Parser;
+
+const REDIRECT_URI: &str = "/redirect";
+
+/// Basic OpenID test client
+#[derive(Parser, Debug)]
+pub struct AppConfig {
+    /// Listen URL
+    #[arg(short, long, env, default_value = "0.0.0.0:7510")]
+    pub listen_addr: String,
+
+    /// Public URL, the URL where this service is accessible, without the trailing slash
+    #[arg(short, long, env, default_value = "http://localhost:7510")]
+    pub public_url: String,
+
+    /// URL where the OpenID configuration can be found
+    #[arg(short, long, env)]
+    pub configuration_url: String,
+
+    /// OpenID client ID
+    #[arg(long, env)]
+    pub client_id: String,
+
+    /// OpenID client secret
+    #[arg(long, env)]
+    pub client_secret: String,
+
+    /// Proxy IP, might end with a "*"
+    #[clap(long, env)]
+    pub proxy_ip: Option<String>,
+}
+
+impl AppConfig {
+    pub fn get() -> &'static Self {
+        &CONF
+    }
+
+    pub fn redirect_url(&self) -> String {
+        format!("{}{}", self.public_url, REDIRECT_URI)
+    }
+}
+
+lazy_static::lazy_static! {
+    static ref CONF: AppConfig = {
+        AppConfig::parse()
+    };
+}
+
+#[cfg(test)]
+mod test {
+    use crate::app_config::AppConfig;
+
+    #[test]
+    fn verify_cli() {
+        use clap::CommandFactory;
+        AppConfig::command().debug_assert();
+    }
+}

src/crypto_wrapper.rs

@@ -0,0 +1,97 @@
+use std::io::ErrorKind;
+
+use crate::Res;
+use aes_gcm::aead::{Aead, OsRng};
+use aes_gcm::{Aes256Gcm, Key, KeyInit, Nonce};
+use base64::engine::general_purpose::STANDARD as BASE64_STANDARD;
+use base64::Engine as _;
+use bincode::{Decode, Encode};
+use rand::Rng;
+
+const NONCE_LEN: usize = 12;
+
+pub struct CryptoWrapper {
+    key: Key<Aes256Gcm>,
+}
+
+impl CryptoWrapper {
+    /// Generate a new memory wrapper
+    pub fn new_random() -> Self {
+        Self {
+            key: Aes256Gcm::generate_key(&mut OsRng),
+        }
+    }
+
+    /// Encrypt some data
+    pub fn encrypt<T: Encode + Decode>(&self, data: &T) -> Res<String> {
+        let aes_key = Aes256Gcm::new(&self.key);
+        let nonce_bytes = rand::thread_rng().gen::<[u8; NONCE_LEN]>();
+
+        let serialized_data = bincode::encode_to_vec(data, bincode::config::standard())?;
+
+        let mut enc = aes_key
+            .encrypt(Nonce::from_slice(&nonce_bytes), serialized_data.as_slice())
+            .unwrap();
+        enc.extend_from_slice(&nonce_bytes);
+
+        Ok(BASE64_STANDARD.encode(enc))
+    }
+
+    /// Decrypt some data previously encrypted using the [`CryptoWrapper::encrypt`] method
+    pub fn decrypt<T: Decode>(&self, input: &str) -> Res<T> {
+        let bytes = BASE64_STANDARD.decode(input)?;
+
+        if bytes.len() < NONCE_LEN {
+            return Err(Box::new(std::io::Error::new(
+                ErrorKind::Other,
+                "Input string is smaller than nonce!",
+            )));
+        }
+
+        let (enc, nonce) = bytes.split_at(bytes.len() - NONCE_LEN);
+        assert_eq!(nonce.len(), NONCE_LEN);
+
+        let aes_key = Aes256Gcm::new(&self.key);
+
+        let dec = match aes_key.decrypt(Nonce::from_slice(nonce), enc) {
+            Ok(d) => d,
+            Err(e) => {
+                log::error!("Failed to decrypt wrapped data! {:#?}", e);
+                return Err(Box::new(std::io::Error::new(
+                    ErrorKind::Other,
+                    "Failed to decrypt wrapped data!",
+                )));
+            }
+        };
+
+        Ok(bincode::decode_from_slice(&dec, bincode::config::standard())?.0)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use crate::crypto_wrapper::CryptoWrapper;
+    use bincode::{Decode, Encode};
+
+    #[derive(Encode, Decode, Eq, PartialEq, Debug)]
+    struct Message(String);
+
+    #[test]
+    fn encrypt_and_decrypt() {
+        let wrapper = CryptoWrapper::new_random();
+        let msg = Message("Pierre was here".to_string());
+        let enc = wrapper.encrypt(&msg).unwrap();
+        let dec: Message = wrapper.decrypt(&enc).unwrap();
+
+        assert_eq!(dec, msg)
+    }
+
+    #[test]
+    fn encrypt_and_decrypt_invalid() {
+        let wrapper_1 = CryptoWrapper::new_random();
+        let wrapper_2 = CryptoWrapper::new_random();
+        let msg = Message("Pierre was here".to_string());
+        let enc = wrapper_1.encrypt(&msg).unwrap();
+        wrapper_2.decrypt::<Message>(&enc).unwrap_err();
+    }
+}

src/lib.rs

@@ -0,0 +1,10 @@
+use std::error::Error;
+
+pub type Res<A = ()> = Result<A, Box<dyn Error>>;
+
+pub mod app_config;
+pub mod crypto_wrapper;
+pub mod openid_primitives;
+pub mod remote_ip;
+pub mod state_manager;
+pub mod time_utils;

src/main.rs

@@ -1,50 +1,178 @@
-use clap::Parser;
+use actix_web::middleware::Logger;
+use actix_web::{get, web, App, HttpResponse, HttpServer};
+use askama::Template;
 
-/// Basic OpenID test client
-#[derive(Parser, Debug)]
-struct AppConfig {
-    /// Listen URL
-    #[arg(short, long, env, default_value = "0.0.0.0:7510")]
-    listen_addr: String,
+use oidc_test_client::app_config::AppConfig;
+use oidc_test_client::openid_primitives::OpenIDConfig;
+use oidc_test_client::remote_ip::RemoteIP;
+use oidc_test_client::state_manager::StateManager;
 
-    /// Public URL, the URL where this service is accessible, without the trailing slash
-    #[arg(short, long, env, default_value = "http://localhost:7510")]
-    public_url: String,
-
-    /// URL where the OpenID configuration can be found
-    #[arg(short, long, env)]
-    configuration_url: String,
-
-    /// OpenID client ID
-    #[arg(long, env)]
-    client_id: String,
-
-    /// OpenID client secret
-    #[arg(long, env)]
-    client_secret: String,
+#[get("/assets/bootstrap.min.css")]
+async fn bootstrap() -> HttpResponse {
+    HttpResponse::Ok()
+        .content_type("text/css")
+        .body(include_str!("../assets/bootstrap.min.css"))
 }
 
-lazy_static::lazy_static! {
-    static ref CONF: AppConfig = {
-        AppConfig::parse()
-    };
+#[get("/assets/cover.css")]
+async fn cover() -> HttpResponse {
+    HttpResponse::Ok()
+        .content_type("text/css")
+        .body(include_str!("../assets/cover.css"))
 }
 
-fn main() {
-    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
-
-    log::info!("Will listen on {}", CONF.listen_addr);
-
-    println!("Hello, world!");
+#[derive(Template)]
+#[template(path = "home.html")]
+struct HomeTemplate {
+    redirect_url: String,
 }
 
-#[cfg(test)]
-mod test {
-    use crate::AppConfig;
+#[derive(Template)]
+#[template(path = "result.html")]
+struct ResultTemplate {
+    token: String,
+    user_info: String,
+}
 
-    #[test]
-    fn verify_cli() {
-        use clap::CommandFactory;
-        AppConfig::command().debug_assert();
+#[derive(Template)]
+#[template(path = "error.html")]
+struct ErrorTemplate<'a> {
+    message: &'a str,
+}
+
+impl<'a> ErrorTemplate<'a> {
+    pub fn build(message: &'a str) -> HttpResponse {
+        HttpResponse::Unauthorized()
+            .content_type("text/html")
+            .body(Self { message }.render().unwrap())
     }
 }
+
+#[get("/")]
+async fn home() -> HttpResponse {
+    HttpResponse::Ok().content_type("text/html").body(
+        HomeTemplate {
+            redirect_url: AppConfig::get().redirect_url(),
+        }
+        .render()
+        .unwrap(),
+    )
+}
+
+#[get("/start")]
+async fn start(remote_ip: RemoteIP) -> HttpResponse {
+    let config = match OpenIDConfig::load_from(&AppConfig::get().configuration_url).await {
+        Ok(c) => c,
+        Err(e) => {
+            log::error!("Failed to load OpenID configuration! {e}");
+            return ErrorTemplate::build("Failed to load OpenID configuration!");
+        }
+    };
+
+    let state = match StateManager::gen_state(&remote_ip) {
+        Ok(s) => s,
+        Err(e) => {
+            log::error!("Failed to generate state! {:?}", e);
+            return ErrorTemplate::build("Failed to generate state!");
+        }
+    };
+
+    let authorization_url = config.authorization_url(
+        &AppConfig::get().client_id,
+        &state,
+        &AppConfig::get().redirect_url(),
+    );
+
+    HttpResponse::Found()
+        .append_header(("Location", authorization_url))
+        .finish()
+}
+
+#[derive(serde::Deserialize)]
+struct RedirectQuery {
+    state: String,
+    code: String,
+}
+
+#[get("/redirect")]
+async fn redirect(remote_ip: RemoteIP, query: web::Query<RedirectQuery>) -> HttpResponse {
+    // First, validate state
+    if let Err(e) = StateManager::validate_state(&remote_ip, &query.state) {
+        log::error!("Failed to validate state {}: {:?}", query.state, e);
+        return ErrorTemplate::build("State could not be validated!");
+    }
+
+    // Then, load OpenID configuration
+    let config = match OpenIDConfig::load_from(&AppConfig::get().configuration_url).await {
+        Ok(c) => c,
+        Err(e) => {
+            log::error!("Failed to load OpenID configuration! {e}");
+            return ErrorTemplate::build("Failed to load OpenID configuration!");
+        }
+    };
+
+    // Query token endpoint
+    let (token, token_str) = match config
+        .request_token(
+            &AppConfig::get().client_id,
+            &AppConfig::get().client_secret,
+            &query.code,
+            &AppConfig::get().redirect_url(),
+        )
+        .await
+    {
+        Ok(t) => t,
+        Err(e) => {
+            log::error!("Failed to retrieve token! {}", e);
+            return ErrorTemplate::build("Failed to retrieve access token!");
+        }
+    };
+
+    // Query userinfo endpoint
+    let (_user_info, user_info_str) = match config.request_user_info(&token).await {
+        Ok(t) => t,
+        Err(e) => {
+            log::error!("Failed to retrieve user info! {}", e);
+            return ErrorTemplate::build("Failed to retrieve user info!");
+        }
+    };
+
+    HttpResponse::Ok().content_type("text/html").body(
+        ResultTemplate {
+            token: serde_json::to_string_pretty(
+                &serde_json::from_str::<serde_json::Value>(&token_str).unwrap(),
+            )
+            .unwrap(),
+            user_info: serde_json::to_string_pretty(
+                &serde_json::from_str::<serde_json::Value>(&user_info_str).unwrap(),
+            )
+            .unwrap(),
+        }
+        .render()
+        .unwrap(),
+    )
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
+
+    log::info!("Init state manager");
+    StateManager::init();
+
+    log::info!("Will listen on {}", AppConfig::get().listen_addr);
+
+    HttpServer::new(|| {
+        App::new()
+            .wrap(Logger::default())
+            .service(bootstrap)
+            .service(cover)
+            .service(home)
+            .service(start)
+            .service(redirect)
+    })
+    .bind(&AppConfig::get().listen_addr)
+    .expect("Failed to bind server!")
+    .run()
+    .await
+}

src/openid_primitives.rs

@@ -0,0 +1,97 @@
+use base64::engine::general_purpose::STANDARD as BASE64_STANDARD;
+use base64::Engine;
+use std::collections::HashMap;
+
+use crate::Res;
+
+#[derive(Debug, Clone, serde::Deserialize)]
+pub struct OpenIDConfig {
+    pub authorization_endpoint: String,
+    pub token_endpoint: String,
+    pub userinfo_endpoint: String,
+}
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct TokenResponse {
+    pub access_token: String,
+    pub token_type: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub refresh_token: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub expires_in: Option<u64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub id_token: Option<String>,
+}
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct UserInfo {
+    pub sub: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub name: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub given_name: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub family_name: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub preferred_username: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub email: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub email_verified: Option<bool>,
+}
+
+impl OpenIDConfig {
+    /// Load OpenID configuration from a given URL
+    pub async fn load_from(url: &str) -> Res<Self> {
+        Ok(reqwest::get(url).await?.json().await?)
+    }
+
+    /// Get the authorization URL where a user should be redirect
+    pub fn authorization_url(&self, client_id: &str, state: &str, redirect_uri: &str) -> String {
+        let client_id = urlencoding::encode(client_id);
+        let state = urlencoding::encode(state);
+        let redirect_uri = urlencoding::encode(redirect_uri);
+
+        format!("{}?response_type=code&scope=openid%20profile%20email&client_id={client_id}&state={state}&redirect_uri={redirect_uri}", self.authorization_endpoint)
+    }
+
+    /// Query the token endpoint
+    pub async fn request_token(
+        &self,
+        client_id: &str,
+        client_secret: &str,
+        code: &str,
+        redirect_uri: &str,
+    ) -> Res<(TokenResponse, String)> {
+        let authorization = BASE64_STANDARD.encode(format!("{}:{}", client_id, client_secret));
+
+        let mut params = HashMap::new();
+        params.insert("grant_type", "authorization_code");
+        params.insert("code", code);
+        params.insert("redirect_uri", redirect_uri);
+
+        let response = reqwest::Client::new()
+            .post(&self.token_endpoint)
+            .header("Authorization", format!("Basic {authorization}"))
+            .form(&params)
+            .send()
+            .await?
+            .text()
+            .await?;
+
+        Ok((serde_json::from_str(&response)?, response))
+    }
+
+    /// Query the UserInfo endpoint
+    pub async fn request_user_info(&self, token: &TokenResponse) -> Res<(UserInfo, String)> {
+        let response = reqwest::Client::new()
+            .get(&self.userinfo_endpoint)
+            .header("Authorization", format!("Bearer {}", token.access_token))
+            .send()
+            .await?
+            .text()
+            .await?;
+
+        Ok((serde_json::from_str(&response)?, response))
+    }
+}

src/remote_ip.rs

@@ -0,0 +1,202 @@
+use std::net::{IpAddr, Ipv6Addr};
+
+use crate::app_config::AppConfig;
+use actix_web::dev::Payload;
+use actix_web::{Error, FromRequest, HttpRequest};
+use futures_util::future::{ready, Ready};
+use std::str::FromStr;
+
+/// Parse an IP address
+pub fn parse_ip(ip: &str) -> Option<IpAddr> {
+    let mut ip = match IpAddr::from_str(ip) {
+        Ok(ip) => ip,
+        Err(e) => {
+            log::warn!("Failed to parse an IP address: {}", e);
+            return None;
+        }
+    };
+
+    if let IpAddr::V6(ipv6) = &mut ip {
+        let mut octets = ipv6.octets();
+        for o in octets.iter_mut().skip(8) {
+            *o = 0;
+        }
+        ip = IpAddr::V6(Ipv6Addr::from(octets));
+    }
+
+    Some(ip)
+}
+
+/// Check if two ips matches
+pub fn match_ip(pattern: &str, ip: &str) -> bool {
+    if pattern.eq(ip) {
+        return true;
+    }
+
+    if pattern.ends_with('*') && ip.starts_with(&pattern.replace('*', "")) {
+        return true;
+    }
+
+    false
+}
+
+/// Get the remote IP address
+pub fn get_remote_ip(req: &HttpRequest, proxy_ip: Option<&str>) -> IpAddr {
+    let mut ip = req.peer_addr().unwrap().ip();
+
+    // We check if the request comes from a trusted reverse proxy
+    if let Some(proxy) = proxy_ip.as_ref() {
+        if match_ip(proxy, &ip.to_string()) {
+            if let Some(header) = req.headers().get("X-Forwarded-For") {
+                let header = header.to_str().unwrap();
+
+                let remote_ip = if let Some((upstream_ip, _)) = header.split_once(',') {
+                    upstream_ip
+                } else {
+                    header
+                };
+
+                if let Some(upstream_ip) = parse_ip(remote_ip) {
+                    ip = upstream_ip;
+                }
+            }
+        }
+    }
+
+    ip
+}
+
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct RemoteIP(pub IpAddr);
+
+impl From<RemoteIP> for IpAddr {
+    fn from(i: RemoteIP) -> Self {
+        i.0
+    }
+}
+
+impl FromRequest for RemoteIP {
+    type Error = Error;
+    type Future = Ready<Result<Self, Error>>;
+
+    #[inline]
+    fn from_request(req: &HttpRequest, _: &mut Payload) -> Self::Future {
+        ready(Ok(RemoteIP(get_remote_ip(
+            req,
+            AppConfig::get().proxy_ip.as_deref(),
+        ))))
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
+    use std::str::FromStr;
+
+    use crate::remote_ip::{get_remote_ip, parse_ip};
+    use actix_web::test::TestRequest;
+
+    #[test]
+    fn test_get_remote_ip() {
+        let req = TestRequest::default()
+            .peer_addr(SocketAddr::from_str("192.168.1.1:1000").unwrap())
+            .to_http_request();
+        assert_eq!(
+            get_remote_ip(&req, None),
+            "192.168.1.1".parse::<IpAddr>().unwrap()
+        );
+    }
+
+    #[test]
+    fn test_get_remote_ip_from_proxy() {
+        let req = TestRequest::default()
+            .peer_addr(SocketAddr::from_str("192.168.1.1:1000").unwrap())
+            .insert_header(("X-Forwarded-For", "1.1.1.1"))
+            .to_http_request();
+        assert_eq!(
+            get_remote_ip(&req, Some("192.168.1.1")),
+            "1.1.1.1".parse::<IpAddr>().unwrap()
+        );
+    }
+
+    #[test]
+    fn test_get_remote_ip_from_proxy_2() {
+        let req = TestRequest::default()
+            .peer_addr(SocketAddr::from_str("192.168.1.1:1000").unwrap())
+            .insert_header(("X-Forwarded-For", "1.1.1.1, 1.2.2.2"))
+            .to_http_request();
+        assert_eq!(
+            get_remote_ip(&req, Some("192.168.1.1")),
+            "1.1.1.1".parse::<IpAddr>().unwrap()
+        );
+    }
+
+    #[test]
+    fn test_get_remote_ip_from_proxy_ipv6() {
+        let req = TestRequest::default()
+            .peer_addr(SocketAddr::from_str("192.168.1.1:1000").unwrap())
+            .insert_header(("X-Forwarded-For", "10::1, 1.2.2.2"))
+            .to_http_request();
+        assert_eq!(
+            get_remote_ip(&req, Some("192.168.1.1")),
+            "10::".parse::<IpAddr>().unwrap()
+        );
+    }
+
+    #[test]
+    fn test_get_remote_ip_from_no_proxy() {
+        let req = TestRequest::default()
+            .peer_addr(SocketAddr::from_str("192.168.1.1:1000").unwrap())
+            .insert_header(("X-Forwarded-For", "1.1.1.1, 1.2.2.2"))
+            .to_http_request();
+        assert_eq!(
+            get_remote_ip(&req, None),
+            "192.168.1.1".parse::<IpAddr>().unwrap()
+        );
+    }
+
+    #[test]
+    fn test_get_remote_ip_from_other_proxy() {
+        let req = TestRequest::default()
+            .peer_addr(SocketAddr::from_str("192.168.1.1:1000").unwrap())
+            .insert_header(("X-Forwarded-For", "1.1.1.1, 1.2.2.2"))
+            .to_http_request();
+        assert_eq!(
+            get_remote_ip(&req, Some("192.168.1.2")),
+            "192.168.1.1".parse::<IpAddr>().unwrap()
+        );
+    }
+
+    #[test]
+    fn parse_bad_ip() {
+        let ip = parse_ip("badbad");
+        assert_eq!(None, ip);
+    }
+
+    #[test]
+    fn parse_ip_v4_address() {
+        let ip = parse_ip("192.168.1.1").unwrap();
+        assert_eq!(ip, IpAddr::V4(Ipv4Addr::new(192, 168, 1, 1)));
+    }
+
+    #[test]
+    fn parse_ip_v6_address() {
+        let ip = parse_ip("2a00:1450:4007:813::200e").unwrap();
+        assert_eq!(
+            ip,
+            IpAddr::V6(Ipv6Addr::new(0x2a00, 0x1450, 0x4007, 0x813, 0, 0, 0, 0))
+        );
+    }
+
+    #[test]
+    fn parse_ip_v6_address_2() {
+        let ip = parse_ip("::1").unwrap();
+        assert_eq!(ip, IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0)));
+    }
+
+    #[test]
+    fn parse_ip_v6_address_3() {
+        let ip = parse_ip("a::1").unwrap();
+        assert_eq!(ip, IpAddr::V6(Ipv6Addr::new(0xa, 0, 0, 0, 0, 0, 0, 0)));
+    }
+}

src/state_manager.rs

@@ -0,0 +1,72 @@
+use std::error::Error;
+use std::fmt;
+
+use crate::crypto_wrapper::CryptoWrapper;
+use crate::remote_ip::RemoteIP;
+use crate::time_utils::time;
+use crate::Res;
+use bincode::{Decode, Encode};
+use std::net::IpAddr;
+
+pub struct StateManager;
+
+static mut WRAPPER: Option<CryptoWrapper> = None;
+
+#[derive(Encode, Decode, Debug)]
+struct State {
+    ip: IpAddr,
+    expire: u64,
+}
+
+impl State {
+    pub fn new(ip: IpAddr) -> Self {
+        Self {
+            ip,
+            expire: time() + 15 * 60,
+        }
+    }
+}
+
+#[derive(Debug, Copy, Clone)]
+enum StateError {
+    InvalidIp,
+    Expired,
+}
+
+impl Error for StateError {}
+
+impl fmt::Display for StateError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "StateManager error {:?}", self)
+    }
+}
+
+impl StateManager {
+    pub fn init() {
+        unsafe {
+            WRAPPER = Some(CryptoWrapper::new_random());
+        }
+    }
+
+    /// Generate a new state
+    pub fn gen_state(ip: &RemoteIP) -> Res<String> {
+        let state = State::new(ip.0);
+
+        unsafe { WRAPPER.as_ref().unwrap() }.encrypt(&state)
+    }
+
+    /// Validate generated state
+    pub fn validate_state(ip: &RemoteIP, state: &str) -> Res {
+        let state: State = unsafe { WRAPPER.as_ref().unwrap() }.decrypt(state)?;
+
+        if state.ip != ip.0 {
+            return Err(Box::new(StateError::InvalidIp));
+        }
+
+        if state.expire < time() {
+            return Err(Box::new(StateError::Expired));
+        }
+
+        Ok(())
+    }
+}

src/time_utils.rs

@@ -0,0 +1,9 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
+/// Get current time since epoch
+pub fn time() -> u64 {
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+        .as_secs()
+}

templates/base_page.html

@@ -0,0 +1,41 @@
+<!doctype html>
+<html lang="en" class="h-100" data-bs-theme="auto">
+<head>
+
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <meta name="description" content="OIDC basic test client">
+  <meta name="author" content="Pierre HUBERT">
+  <title>OIDC Test client</title>
+
+  <link href="/assets/bootstrap.min.css" rel="stylesheet" integrity="sha384-KK94CHFLLe+nY2dmCWGMq91rCGa5gtU4mk92HdvYe+M/SXH301p5ILy+dN9+nJOZ" crossorigin="anonymous">
+  <link href="/assets/cover.css" rel="stylesheet" />
+
+  <meta name="theme-color" content="#712cf9">
+
+</head>
+<body class="d-flex h-100 text-center text-bg-dark">
+
+
+<div class="cover-container d-flex w-100 h-100 p-3 mx-auto flex-column">
+  <header class="mb-auto">
+    <div>
+      <h3 class="float-md-start mb-0">OIDC test client</h3>
+
+    </div>
+  </header>
+
+  <main class="px-3">
+    {% block content %}
+    TO_REPLACE
+    {% endblock content %}
+  </main>
+
+  <footer class="mt-auto text-white-50">
+    <p>&copy; Pierre HUBERT</p>
+  </footer>
+</div>
+
+
+</body>
+</html>

templates/error.html

@@ -0,0 +1,9 @@
+{% extends "base_page.html" %}
+{% block content %}
+
+<div class="alert alert-danger" role="alert">
+  {{ message }}
+</div>
+
+<a class="btn btn-primary" href="/start" role="button">Start again</a>
+{% endblock content %}

templates/home.html

@@ -0,0 +1,11 @@
+{% extends "base_page.html" %}
+{% block content %}
+
+<h1>Test OIDC Authentication flow.</h1>
+<p class="lead">Get started testing OIDC authentication flow</p>
+<p>Redirect URI: {{ redirect_url }}</p>
+<p class="lead">
+    <a href="/start" class="btn btn-lg btn-light fw-bold border-white bg-white">Start</a>
+</p>
+
+{% endblock content %}

templates/result.html

@@ -0,0 +1,30 @@
+{% extends "base_page.html" %}
+{% block content %}
+
+<style>
+    .card {
+        text-align: left;
+        margin-bottom: 20px;
+    }
+</style>
+
+<div class="alert alert-success" role="alert">
+    Login successful
+</div>
+
+<div class="card">
+    <div class="card-body">
+        <h5 class="card-title">Token response</h5>
+        <pre class="card-text">{{ token }}</pre>
+    </div>
+</div>
+
+<div class="card">
+    <div class="card-body">
+        <h5 class="card-title">User info</h5>
+        <pre class="card-text">{{ user_info }}</pre>
+    </div>
+</div>
+
+<a class="btn btn-primary" href="/start" role="button">Start again</a>
+{% endblock content %}