feat: support OIDC id_token

- generate JWT id_token in token exchange
- store optional nonce in authorization object
- switch to RS256 algorithm for JWT signature
- add JWKs endpoint to provide OIDC clients with public keys

.env

@@ -1 +0,0 @@
-APP_JWT_SECRET=bc1996ea-5464-424a-9a38-5604f2bc865a

Cargo.lock

@@ -349,6 +349,12 @@ dependencies = [
  "windows-targets 0.52.6",
 ]
 
+[[package]]
+name = "base64"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
+
 [[package]]
 name = "base64"
 version = "0.21.7"
@@ -966,11 +972,13 @@ dependencies = [
  "chrono",
  "env_logger",
  "fully_pub",
+ "jsonwebkey-convert",
  "jsonwebtoken",
  "kernel",
  "log",
  "minijinja",
  "minijinja-embed",
+ "pem 3.0.4",
  "serde",
  "serde_json",
  "serde_urlencoded",
@@ -1238,6 +1246,20 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "jsonwebkey-convert"
+version = "0.3.0"
+dependencies = [
+ "base64 0.13.1",
+ "lazy_static",
+ "num-bigint",
+ "pem 0.8.3",
+ "serde",
+ "serde_json",
+ "simple_asn1 0.5.4",
+ "thiserror 1.0.69",
+]
+
 [[package]]
 name = "jsonwebtoken"
 version = "9.3.0"
@@ -1246,11 +1268,11 @@ checksum = "b9ae10193d25051e74945f1ea2d0b42e03cc3b890f7e4cc5faa44997d808193f"
 dependencies = [
  "base64 0.21.7",
  "js-sys",
- "pem",
+ "pem 3.0.4",
  "ring",
  "serde",
  "serde_json",
- "simple_asn1",
+ "simple_asn1 0.6.2",
 ]
 
 [[package]]
@@ -1561,6 +1583,17 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
 
+[[package]]
+name = "pem"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd56cbd21fea48d0c440b41cd69c589faacade08c992d9a54e471b79d0fd13eb"
+dependencies = [
+ "base64 0.13.1",
+ "once_cell",
+ "regex",
+]
+
 [[package]]
 name = "pem"
 version = "3.0.4"
@@ -1921,6 +1954,18 @@ dependencies = [
  "rand_core",
 ]
 
+[[package]]
+name = "simple_asn1"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8eb4ea60fb301dc81dfc113df680571045d375ab7345d171c5dc7d7e13107a80"
+dependencies = [
+ "chrono",
+ "num-bigint",
+ "num-traits",
+ "thiserror 1.0.69",
+]
+
 [[package]]
 name = "simple_asn1"
 version = "0.6.2"

TODO.md

@@ -1,5 +1,8 @@
 # TODO
 
+- [ ] better OIDC support
+- [ ] better support of `profile` `openid` `email` `roles` scopes
+
 - [ ] i18n strings in the http website.
 
 - [ ] Instance customization support
@@ -50,3 +53,5 @@
 - [X] basic docker setup
 - [ ] make `docker stop` working (handle SIGTERM/SIGINT)
 - [ ] implement docker secrets. https://docs.docker.com/engine/swarm/secrets/
+
+- [ ] Find a minimal OpenID client implementation like Listmonk but a little bit more mature

config.toml

@@ -1,8 +1,23 @@
+signing_key = "tmp/secrets/signing.key"
+
 [instance]
-base_uri = "http://localhost:8085"
+base_uri = "https://auth.fictive.org"
-name = "Example org"
+name = "Fictive's auth"
 logo_uri = "https://example.org/logo.png"
 
+[[applications]]
+slug = "listmonk"
+name = "Listmonk"
+description = "Newsletter tool."
+client_id = "da2120b4-635d-4eb5-8b2f-dbae89f6a6e9"
+client_secret = "59da2291-8999-40e2-afe9-a54ac7cd0a94"
+login_uri = "https://lists.fictive.org"
+allowed_redirect_uris = [
+    "https://lists.fictive.org/auth/oidc",
+]
+visibility = "Internal"
+authorize_flow = "Implicit"
+
 [[applications]]
 slug = "demo_app"
 name = "Demo app"

justfile

@@ -2,17 +2,17 @@ export RUST_BACKTRACE := "1"
 export RUST_LOG := "trace"
 export CONTEXT_ARGS := "--config config.toml --database tmp/dbs/minauthator.db --static-assets ./assets"
 
-watch-server:
+watch-server *args:
-    cargo-watch -x "run --bin minauthator-server -- $CONTEXT_ARGS"
+    cargo-watch -x "run --bin minauthator-server -- $CONTEXT_ARGS {{args}}"
 
-server:
+server *args:
-    cargo run --bin minauthator-server -- $CONTEXT_ARGS
+    cargo run --bin minauthator-server -- $CONTEXT_ARGS {{args}}
 
-admin:
+admin *args:
-    cargo run --bin minauthator-admin -- $CONTEXT_ARGS
+    cargo run --bin minauthator-admin -- $CONTEXT_ARGS {{args}}
 
-docker-build:
+docker-build *args:
-    docker build -t lefuturiste/minauthator .
+    docker build -t lefuturiste/minauthator {{args}} .
 
 docker-init-db:
     docker run \
@@ -28,6 +28,6 @@ docker-run:
         -v minauthator-db:/var/lib/minauthator \
         lefuturiste/minauthator
 
-init-db:
+init-db *args:
-    sqlite3 -echo tmp/dbs/minauthator.db < migrations/all.sql
+    sqlite3 {{args}} tmp/dbs/minauthator.db < migrations/all.sql
 

lib/http_server/Cargo.toml

@@ -43,6 +43,15 @@ argh = { workspace = true }
 sqlx = { workspace = true }
 uuid = { workspace = true }
 url = { workspace = true }
+pem = "3.0.4"
+
+# For now, we test if it's viable, and later we will fork it to fix the build (cf. issue
+# https://github.com/informationsea/jsonwebkey-rs#1 )
+[dependencies.jsonwebkey-convert]
+path = "/home/mbess/workspace/foss/rust_libs/jsonwebkey-rs/jsonwebkey-convert"
+features = ["simple_asn1", "pem"]
+
+pem = "3.0.4"
 
 [build-dependencies]
 minijinja-embed = "2.3.1"

lib/http_server/src/controllers/api/oauth2/access_token.rs

@@ -4,9 +4,9 @@ use fully_pub::fully_pub;
 use log::error;
 use serde::{Deserialize, Serialize};
 
-use kernel::models::authorization::Authorization;
+use kernel::{models::authorization::Authorization, repositories::users::get_user_by_id};
 use crate::{
-    services::{app_session::AppClientSession, session::create_token}, token_claims::AppUserTokenClaims, AppState
+    services::{app_session::AppClientSession, session::create_token}, token_claims::{OAuth2AccessTokenClaims, OIDCIdTokenClaims}, AppState
 };
 
 const AUTHORIZATION_CODE_TTL_SECONDS: i64 = 120;
@@ -22,6 +22,7 @@ struct AccessTokenRequestParams {
 #[derive(Serialize, Deserialize)]
 #[fully_pub]
 struct AccessTokenResponse {
+    id_token: String,
     access_token: String,
     token_type: String,
     expires_in: u64
@@ -60,6 +61,7 @@ pub async fn get_access_token(
             ).into_response();
         }
     };
+
     // 2.2. Validate that the authorization code is not expired
     let is_code_valid = authorization.last_used_at
         .map_or(false, |ts| {
@@ -72,19 +74,38 @@ pub async fn get_access_token(
         ).into_response();
     }
 
-    // 3. Generate JWT for oauth2 client user session
+    // 2.3. Fetch user resource owner
-    let jwt = create_token(
+    let user = get_user_by_id(&app_state.db, &authorization.user_id)
+        .await
+        .expect("Expected to get user from authorization.");
+
+    // 3.1. Generate JWT for OAuth2 client user session
+    let access_token_jwt = create_token(
+        &app_state.config,
         &app_state.secrets,
-        AppUserTokenClaims::new(
+        OAuth2AccessTokenClaims::new(
-            &app_client_session.client_id,
+            &app_state.config,
-            &authorization.user_id,
+            &user,
             authorization.scopes.to_vec()
         )
     );
+    // 3.2. Generate id_token for OIDC client
+    let id_token_claims = OIDCIdTokenClaims::new(
+        &app_state.config,
+        &app_client_session.client_id,
+        user.clone(),
+        authorization.nonce.clone()
+    );
+    let id_token_jwt = create_token(
+        &app_state.config,
+        &app_state.secrets,
+        id_token_claims
+    );
     // 4. return JWT
     let access_token_res = AccessTokenResponse {
-        access_token: jwt,
+        id_token: id_token_jwt,
-        token_type: "jwt".to_string(),
+        access_token: access_token_jwt,
+        token_type: "Bearer".to_string(),
         expires_in: 3600
     };
     Json(access_token_res).into_response()

lib/http_server/src/controllers/api/openid/keys.rs

@@ -0,0 +1,45 @@
+use jsonwebkey_convert::RSAPublicKey;
+use jsonwebkey_convert::der::FromPem;
+
+use axum::{extract::State, response::IntoResponse, Json};
+use fully_pub::fully_pub;
+use serde::Serialize;
+
+use crate::AppState;
+
+// /// JSON Web Key
+// /// @See https://www.rfc-editor.org/rfc/rfc7517.html
+// #[derive(Serialize)]
+// #[fully_pub]
+// struct RsaJWK {
+//     #[serde(rename = "use")]
+//     utilisation: String,
+//     alg: String,
+//     kid: String,
+//     #[serde(rename = "modulus")]
+//     modulus: String,
+//     exp: String
+// }
+
+/// JSON Web Key set
+/// @See https://www.rfc-editor.org/rfc/rfc7517.html
+#[derive(Serialize)]
+#[fully_pub]
+struct JWKs {
+    keys: Vec<RSAPublicKey>
+}
+
+pub async fn get_signing_public_keys(
+    State(app_state): State<AppState>,
+) -> impl IntoResponse {
+    let pem_data = app_state.secrets.signing_keypair.0;
+    
+    // extract modulus and exp number from ASN.1 encoded PCKS 1 package
+    let rsa_jwk = RSAPublicKey::from_pem(pem_data)
+        .expect("Expected to decode PEM public key");
+    dbg!(&rsa_jwk);
+    
+    Json(JWKs {
+        keys: vec![rsa_jwk]
+    }).into_response()
+}

lib/http_server/src/controllers/api/openid/mod.rs

@@ -1 +1,2 @@
 pub mod well_known;
+pub mod keys;

lib/http_server/src/controllers/api/openid/well_known.rs

@@ -6,6 +6,8 @@ use strum::IntoEnumIterator;
 
 use crate::AppState;
 
+/// Manifest used by OpenID Connect clients
+/// @See https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata
 #[derive(Serialize)]
 #[fully_pub]
 struct WellKnownOpenIdConfiguration {
@@ -15,7 +17,9 @@ struct WellKnownOpenIdConfiguration {
     userinfo_endpoint: String,
     scopes_supported: Vec<String>,
     response_types_supported: Vec<String>,
-    token_endpoint_auth_methods_supported: Vec<String>
+    token_endpoint_auth_methods_supported: Vec<String>,
+    id_token_signing_alg_values_supported: Vec<String>,
+    jwks_uri: String
 }
 
 pub async fn get_well_known_openid_configuration(
@@ -30,5 +34,9 @@ pub async fn get_well_known_openid_configuration(
         scopes_supported: AuthorizationScope::iter().map(|v| v.to_string()).collect(),
         response_types_supported: vec!["code".into()],
         token_endpoint_auth_methods_supported: vec!["client_secret_basic".into()],
+        id_token_signing_alg_values_supported: vec!["RS256".into()],
+        jwks_uri: format!("{}/.well-known/jwks", base_url)
+        // jwks_uri:
+        // subject_types_supported
     })
 }

lib/http_server/src/controllers/api/read_user.rs

@@ -2,7 +2,7 @@ use axum::{extract::State, response::IntoResponse, Extension, Json};
 use fully_pub::fully_pub;
 use serde::Serialize;
 
-use crate::{token_claims::AppUserTokenClaims, AppState};
+use crate::{token_claims::OAuth2AccessTokenClaims, AppState};
 use kernel::models::user::User;
 
 #[derive(Serialize)]
@@ -18,11 +18,11 @@ struct ReadUserBasicExtract {
 
 pub async fn read_user_basic(
     State(app_state): State<AppState>,
-    Extension(token_claims): Extension<AppUserTokenClaims>,
+    Extension(token_claims): Extension<OAuth2AccessTokenClaims>,
 ) -> impl IntoResponse {
     // 1. This handler require app user authentification (JWT)
     let user_res = sqlx::query_as::<_, User>("SELECT * FROM users WHERE id = $1")
-        .bind(&token_claims.user_id)
+        .bind(&token_claims.sub)
         .fetch_one(&app_state.db.0)
         .await
         .expect("To get user from claim");

lib/http_server/src/controllers/ui/authorize.rs

@@ -7,9 +7,7 @@ use serde::{Deserialize, Serialize};
 use url::Url;
 use uuid::Uuid;
 
-use kernel::{
+use kernel::models::{authorization::Authorization, config::AppAuthorizeFlow};
-    models::{authorization::Authorization, config::AppAuthorizeFlow}
-};
 use utils::get_random_alphanumerical;
 use crate::{
     renderer::TemplateRenderer, services::oauth2::{parse_scope, verify_redirect_uri}, token_claims::UserTokenClaims, AppState
@@ -25,6 +23,7 @@ struct AuthorizationParams {
     redirect_uri: String,
     /// An opaque value used by the client to maintain state between the request and callback
     state: String,
+    nonce: Option<String>
 }
 
 fn redirect_to_client(
@@ -34,7 +33,7 @@ fn redirect_to_client(
     let target_url = format!("{}?code={}&state={}",
         authorization_params.redirect_uri,
         authorization_code,
-        authorization_params.state,
+        authorization_params.state
     );
     debug!("Redirecting to {}", target_url);
 
@@ -56,6 +55,7 @@ pub async fn authorize_form(
     query_params: Query<AuthorizationParams>
 ) -> impl IntoResponse {
     let Query(authorization_params) = query_params;
+    dbg!(&authorization_params);
 
     // 1. Verify the app details
     let app = match app_state.config.applications
@@ -116,9 +116,10 @@ pub async fn authorize_form(
             // Create new auth code
             let authorization_code = get_random_alphanumerical(32);
             // Update last used timestamp for this authorization
-            let _result = sqlx::query("UPDATE authorizations SET code = $2, last_used_at = $3 WHERE id = $1")
+            let _result = sqlx::query("UPDATE authorizations SET code = $2, nonce = $3, last_used_at = $4 WHERE id = $1")
                 .bind(existing_authorization.id)
                 .bind(authorization_code.clone())
+                .bind(authorization_params.nonce.clone())
                 .bind(Utc::now().to_rfc3339_opts(SecondsFormat::Millis, true))
                 .execute(&app_state.db.0)
                 .await.unwrap();
@@ -172,6 +173,7 @@ pub async fn perform_authorize(
     Extension(token_claims): Extension<UserTokenClaims>,
     Form(authorize_form): Form<AuthorizationParams>
 ) -> impl IntoResponse {
+    dbg!(&authorize_form);
     // 1. Get the app details
     let app = match app_state.config.applications
         .iter()
@@ -203,6 +205,7 @@ pub async fn perform_authorize(
         client_id: app.client_id.clone(),
         scopes: sqlx::types::Json(scopes),
         code: authorization_code.clone(),
+        nonce: authorize_form.nonce.clone(),
         last_used_at: Some(Utc::now()),
         created_at: Utc::now(),
     };
@@ -210,14 +213,15 @@ pub async fn perform_authorize(
     // 3. Save authorization in DB with state
     let res = sqlx::query("
         INSERT INTO authorizations
-            (id, user_id, client_id, scopes, code, last_used_at, created_at)
+            (id, user_id, client_id, scopes, code, nonce, last_used_at, created_at)
-            VALUES ($1, $2, $3, $4, $5, $6, $7)
+            VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
         ")
         .bind(authorization.id.clone())
         .bind(authorization.user_id)
         .bind(authorization.client_id)
         .bind(authorization.scopes)
         .bind(authorization.code)
+        .bind(authorization.nonce)
         .bind(authorization.last_used_at.map(|x| x.to_rfc3339_opts(SecondsFormat::Millis, true)))
         .bind(authorization.created_at.to_rfc3339_opts(SecondsFormat::Millis, true))
         .execute(&app_state.db.0)

lib/http_server/src/controllers/ui/login.rs

@@ -91,8 +91,8 @@ pub async fn perform_login(
         .await.unwrap();
 
     let jwt_max_age = Duration::days(15);
-    let claims = UserTokenClaims::new(&user.id, jwt_max_age);
+    let claims = UserTokenClaims::new(&app_state.config, &user.id, jwt_max_age);
-    let jwt = create_token(&app_state.secrets, claims);
+    let jwt = create_token(&app_state.config, &app_state.secrets, claims);
 
     // TODO: handle keep_session boolean from form and specify cookie max age only if this setting
     // is true

lib/http_server/src/middlewares/app_auth.rs

@@ -9,7 +9,7 @@ use utils::parse_basic_auth;
 
 use crate::{
     services::{app_session::AppClientSession, session::verify_token},
-    token_claims::AppUserTokenClaims,
+    token_claims::OAuth2AccessTokenClaims,
     AppState
 };
 
@@ -102,9 +102,11 @@ pub async fn enforce_jwt_auth_middleware(
             );
         }
     };
-    let token_claims: AppUserTokenClaims = match verify_token(&app_state.secrets, jwt) {
+    let token_claims: OAuth2AccessTokenClaims =
+        match verify_token(&app_state.config, &app_state.secrets, jwt) {
             Ok(val) => val,
             Err(_e) => {
+                dbg!(_e);
                 return Err(
                     (StatusCode::UNAUTHORIZED, Html("Unauthorized: The provided JWT is invalid."))
                 );

lib/http_server/src/middlewares/user_auth.rs

@@ -28,9 +28,11 @@ pub async fn auth_middleware(
             return Ok(next.run(req).await)
         }
     };
-    let token_claims: UserTokenClaims = match verify_token(&app_state.secrets, jwt) {
+    let token_claims: UserTokenClaims =
+        match verify_token(&app_state.config, &app_state.secrets, jwt) {
             Ok(val) => val,
             Err(_e) => {
+                dbg!(&_e);
                 // UserWebGUI: delete invalid JWT cookie
                 return Err(
                     (

lib/http_server/src/router.rs

@@ -51,7 +51,8 @@ pub fn build_router(server_config: &ServerConfig, app_state: AppState) -> Router
         .route("/api/user-assets/:asset_id", get(api::public_assets::get_user_asset));
 
     let well_known_routes = Router::new()
-        .route("/.well-known/openid-configuration", get(api::openid::well_known::get_well_known_openid_configuration));
+        .route("/.well-known/openid-configuration", get(api::openid::well_known::get_well_known_openid_configuration))
+        .route("/.well-known/jwks", get(api::openid::keys::get_signing_public_keys));
 
     Router::new()
         .merge(public_routes)

lib/http_server/src/services/oauth2.rs

@@ -12,9 +12,16 @@ pub fn verify_redirect_uri(app: &Application, input_redirect_uri: &str) -> bool
 pub fn parse_scope(scope_str: &str) -> Result<Vec<AuthorizationScope>> {
     let mut scopes: Vec<AuthorizationScope> = vec![];
     for part in scope_str.split(' ') {
-        scopes.push(
+        if part == "openid" {
-            AuthorizationScope::from_str(part).context("Cannot parse space-delimited scope.")?
+            scopes.push(AuthorizationScope::UserReadBasic);
-        )
+            scopes.push(AuthorizationScope::UserReadRoles);
+            continue;
         }
+        if part == "profile" || part == "email" {
+            continue;
+        }
+        scopes.push(AuthorizationScope::from_str(part).context("Cannot parse space-delimited scope.")?);
+    }
+    dbg!(&scopes);
     Ok(scopes)
 }

lib/http_server/src/services/session.rs

@@ -1,24 +1,37 @@
 use anyhow::Result;
 use serde::{de::DeserializeOwned, Serialize};
 use jsonwebtoken::{encode, decode, Header, Algorithm, Validation, EncodingKey, DecodingKey};
-use kernel::context::AppSecrets;
+use kernel::{context::AppSecrets, models::config::Config};
 
 
-pub fn create_token<T: Serialize>(secrets: &AppSecrets, claims: T) -> String {
+pub fn create_token<T: Serialize>(
+    _config: &Config,
+    secrets: &AppSecrets,
+    claims: T
+) -> String {
     let token = encode(
-        &Header::default(),
+        &Header::new(Algorithm::RS256),
         &claims,
-        &EncodingKey::from_secret(secrets.jwt_secret.as_bytes())
+        &EncodingKey::from_rsa_pem(&secrets.signing_keypair.1)
+            .expect("To build encoding key from signing key.")
     ).expect("Create token");
 
     token
 }
 
-pub fn verify_token<T: DeserializeOwned>(secrets: &AppSecrets, jwt: &str)  -> Result<T> {
+pub fn verify_token<T: DeserializeOwned>(
+    config: &Config,
+    secrets: &AppSecrets,
+    jwt: &str
+)  -> Result<T> {
+    let mut validation = Validation::new(Algorithm::RS256);
+    validation.set_issuer(&[config.instance.base_uri.clone()]);
+    validation.set_audience(&[config.instance.base_uri.clone()]);
     let token_data = decode::<T>(
         jwt,
-        &DecodingKey::from_secret(secrets.jwt_secret.as_bytes()),
+        &DecodingKey::from_rsa_pem(&secrets.signing_keypair.0)
-        &Validation::new(Algorithm::HS256)
+            .expect("To build decoding key from signing key."),
+        &validation 
     )?;
 
     Ok(token_data.claims)

lib/http_server/src/token_claims.rs

@@ -1,6 +1,6 @@
 use fully_pub::fully_pub;
 use jsonwebtoken::get_current_timestamp;
-use kernel::models::authorization::AuthorizationScope;
+use kernel::models::{authorization::AuthorizationScope, config::Config, user::User};
 use serde::{Deserialize, Serialize};
 use time::Duration;
 
@@ -12,41 +12,91 @@ struct UserTokenClaims {
     /// token expiration
     exp: u64,
     /// token issuer
-    iss: String
+    iss: String,
     // TODO: add roles
+    /// token audience
+    aud: String
 }
 
 impl UserTokenClaims {
-    pub fn new(user_id: &str, max_age: Duration) -> Self {
+    pub fn new(config: &Config, user_id: &str, max_age: Duration) -> Self {
         UserTokenClaims {
             sub: user_id.into(),
             exp: get_current_timestamp() + max_age.whole_seconds() as u64,
-            iss: "Minauthator".into()
+            iss: config.instance.base_uri.clone(),
+            aud: config.instance.base_uri.clone(),
         }
     }
 }
 
+/// Access token for OAuth2 defined in RFC 9068
+/// @See https://datatracker.ietf.org/doc/html/rfc9068
 #[derive(Debug, Serialize, Deserialize, Clone)]
 #[fully_pub]
-struct AppUserTokenClaims {
+struct OAuth2AccessTokenClaims {
-    /// combined subject
+    /// Token issuer (URI to the issuer)
-    client_id: String,
+    iss: String,
-    user_id: String,
+    /// Audiance (In this case, the audiance is equal to the issuer)
-    scopes: Vec<AuthorizationScope>,
+    aud: String,
-    /// token expiration
+    /// End-user id assigned by the issuer (user_id)
+    sub: String,
+    /// Token expiration
     exp: u64,
-    /// token issuer
+    /// List of OAuth 2 scopes asked by the client
-    iss: String
+    scopes: Vec<AuthorizationScope>
 }
 
-impl AppUserTokenClaims {
+impl OAuth2AccessTokenClaims {
-    pub fn new(client_id: &str, user_id: &str, scopes: Vec<AuthorizationScope>) -> Self {
+    pub fn new(config: &Config, user: &User, scopes: Vec<AuthorizationScope>) -> Self {
-        AppUserTokenClaims {
+        OAuth2AccessTokenClaims {
-            client_id: client_id.into(),
+            iss: config.instance.base_uri.clone(),
-            user_id: user_id.into(),
+            aud: config.instance.base_uri.clone(),
-            scopes,
+            sub: user.id.clone(),
             exp: get_current_timestamp() + 86_000,
-            iss: "Minauth".into()
+            scopes,
+        }
+    }
+}
+
+
+/// @See https://openid.net/specs/openid-connect-core-1_0.html#IDToken
+/// @See https://openid.net/specs/openid-connect-core-1_0.html#StandardClaims
+#[derive(Debug, Serialize, Deserialize, Clone)]
+#[fully_pub]
+struct OIDCIdTokenClaims {
+    /// Token expiration
+    exp: u64,
+    /// Token issuer (URI to the issuer)
+    iss: String,
+    /// Audiance (client_id)
+    aud: String,
+    /// End-user id assigned by the issuer (user_id)
+    sub: String,
+    /// additional claims
+    name: Option<String>,
+    email: Option<String>,
+    preferred_username: Option<String>,
+    roles: Vec<String>,
+    nonce: Option<String>
+}
+
+impl OIDCIdTokenClaims {
+    pub fn new(
+        config: &Config,
+        client_id: &str,
+        user: User,
+        nonce: Option<String>
+    ) -> Self {
+        OIDCIdTokenClaims {
+            iss: config.instance.base_uri.clone(),
+            aud: client_id.into(),
+            sub: user.id,
+            exp: get_current_timestamp() + 86_000,
+            email: user.email,
+            name: user.full_name,
+            preferred_username: Some(user.handle),
+            roles: user.roles.0,
+            nonce
         }
     }
 }

lib/kernel/src/consts.rs

@@ -1,4 +1,5 @@
 pub const DEFAULT_DB_PATH: &str = "/var/lib/minauthator/minauthator.db";
 pub const DEFAULT_ASSETS_PATH: &str = "/usr/local/lib/minauthator/assets";
 pub const DEFAULT_CONFIG_PATH: &str = "/etc/minauthator/config.toml";
+pub const DEFAULT_SIGNING_KEY_PATH: &str = "/etc/minauthator/secrets/jwt.key.pem";
 

lib/kernel/src/context.rs

@@ -1,11 +1,13 @@
-use std::{env, fs};
+use std::{env, fs, path::Path};
 use anyhow::{Result, Context, anyhow};
 use fully_pub::fully_pub;
 
 use log::info;
-use sqlx::{Pool, Sqlite};
 use crate::{
-    consts::{DEFAULT_CONFIG_PATH, DEFAULT_DB_PATH}, database::prepare_database, models::config::Config, repositories::storage::Storage
+    consts::{DEFAULT_CONFIG_PATH, DEFAULT_DB_PATH, DEFAULT_SIGNING_KEY_PATH},
+    database::prepare_database,
+    models::config::Config,
+    repositories::storage::Storage
 };
 
 /// get server config
@@ -26,9 +28,18 @@ struct StartKernelConfig {
 #[derive(Debug, Clone)]
 #[fully_pub]
 struct AppSecrets {
-    jwt_secret: String
+    /// RSA keypair (public, private) used to signed the JWT issued by minauthator in PEM conainer format
+    signing_keypair: (Vec<u8>, Vec<u8>)
 }
 
+#[derive(Debug, Clone)]
+#[fully_pub]
+struct ComputedConfig {
+    signing_public_key: Vec<u8>,
+    signing_private_key: Vec<u8>
+}
+
+
 #[derive(Debug, Clone)]
 #[fully_pub]
 struct KernelContext {
@@ -37,6 +48,19 @@ struct KernelContext {
     storage: Storage
 }
 
+fn get_signing_keypair(key_path: &str) -> Result<(Vec<u8>, Vec<u8>)> {
+    let key_path = Path::new(key_path);
+    let pub_key_path = key_path.with_extension("pub");
+    let private_key: Vec<u8> = fs::read_to_string(&key_path)
+        .context(format!("Failed to read private key from path {:?}.", key_path))?
+        .as_bytes().to_vec();
+    let public_key: Vec<u8> = fs::read_to_string(&pub_key_path)
+        .context(format!("Failed to read public key from path {:?}.", pub_key_path))?
+        .as_bytes().to_vec();
+
+    Ok((public_key, private_key))
+}
+
 pub async fn get_kernel_context(start_config: StartKernelConfig) -> Result<KernelContext> {
     env_logger::init();
     let _ = dotenvy::dotenv();
@@ -50,10 +74,13 @@ pub async fn get_kernel_context(start_config: StartKernelConfig) -> Result<Kerne
     let config: Config = get_config(config_path)
         .expect("Cannot get config.");
 
+    let signing_key_path = config.signing_key.clone().unwrap_or(DEFAULT_SIGNING_KEY_PATH.to_string());
+
+    // optionally load dotenv file
     let _ = dotenvy::dotenv();
+
     let secrets = AppSecrets {
-        jwt_secret: env::var("APP_JWT_SECRET")
+        signing_keypair: get_signing_keypair(&signing_key_path)?
-            .context("Expected APP_JWT_SECRET environment variable to exists.")?
     };
 
     Ok(KernelContext {

lib/kernel/src/models/authorization.rs

@@ -25,6 +25,8 @@ struct Authorization {
     client_id: String,
     scopes: Json<Vec<AuthorizationScope>>,
 
+    nonce: Option<String>,
+
     /// defined in https://datatracker.ietf.org/doc/html/rfc6749#section-4.1.2
     code: String,
     last_used_at: Option<DateTime<Utc>>,

lib/kernel/src/models/config.rs

@@ -66,11 +66,6 @@ struct Role {
 struct Config {
     instance: InstanceConfig,
     applications: Vec<Application>,
-    roles: Vec<Role>
+    roles: Vec<Role>,
-}
+    signing_key: Option<String>
-
-#[derive(Debug, Clone)]
-#[fully_pub]
-struct AppSecrets {
-    jwt_secret: String
 }

lib/kernel/src/models/user.rs

@@ -14,7 +14,7 @@ enum UserStatus {
     Active
 }
 
-#[derive(sqlx::FromRow, Deserialize, Serialize, Debug)]
+#[derive(sqlx::FromRow, Deserialize, Serialize, Debug, Clone)]
 #[fully_pub]
 struct User {
     /// uuid

migrations/all.sql

@@ -33,6 +33,7 @@ CREATE TABLE authorizations (
     client_id           TEXT NOT NULL,
     scopes              TEXT, -- json array of app scope (permissions)
     code                TEXT,
+    nonce               TEXT, -- code used to associate client session to id_token
 
     last_used_at        DATETIME,
     created_at          DATETIME NOT NULL

tests/hurl_integration/oidc_core/config.toml

@@ -0,0 +1,58 @@
+signing_key = "tmp/secrets/signing.key"
+
+[instance]
+base_uri = "http://localhost:8086"
+name = "Example org"
+logo_uri = "https://example.org/logo.png"
+
+[[applications]]
+slug = "demo_app"
+name = "Demo app"
+description = "A super application where you can do everything you want."
+client_id = "00000001-0000-0000-0000-000000000001"
+client_secret = "dummy_client_secret"
+login_uri = "https://localhost:9876"
+allowed_redirect_uris = [
+    "http://localhost:9090/callback",
+    "http://localhost:9876/callback"
+]
+visibility = "Internal"
+authorize_flow = "Implicit"
+
+[[applications]]
+slug = "wiki"
+name = "Wiki app"
+description = "The knowledge base of the exemple org."
+client_id = "f9de1885-448d-44bb-8c48-7e985486a8c6"
+client_secret = "49c6c16a-0a8a-4981-a60d-5cb96582cc1a"
+login_uri = "https://wiki.example.org/login"
+allowed_redirect_uris = [
+    "https://wiki.example.org/oauth2/callback"
+]
+visibility = "Public"
+authorize_flow = "Implicit"
+
+[[applications]]
+slug = "private_app"
+name = "Demo app"
+description = "Private app you should never discover"
+client_id = "c8a08783-2342-4ce3-a3cb-9dc89b6bdf"
+client_secret = "this_is_the_secret"
+login_uri = "https://private-app.org"
+allowed_redirect_uris = [
+    "http://localhost:9091/authorize",
+]
+visibility = "Private"
+authorize_flow = "Implicit"
+
+[[roles]]
+slug = "basic"
+name = "Basic"
+description = "Basic user"
+default = true
+
+[[roles]]
+slug = "admin"
+name = "Administrator"
+description = "Full power on organization instance"
+

tests/hurl_integration/oidc_core/init_db.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/bash
+
+password_hash="$(echo -n "root" | argon2 salt_06cGGWYDJCZ -e)"
+echo $password_hash
+SQL=$(cat <<EOF
+    INSERT INTO users
+        (id, handle, email, roles, status, password_hash, created_at)
+        VALUES
+        ('$(uuid)', 'john.doe', 'john.doe@example.org', '[]', 'Active', '$password_hash', '2024-11-30T00:00:00Z');
+EOF)
+echo $SQL | sqlite3 $DB_PATH

tests/hurl_integration/oidc_core/main.hurl

@@ -0,0 +1,41 @@
+POST {{ base_url }}/login
+[FormParams]
+login: john.doe
+password: root
+HTTP 303
+[Captures]
+user_jwt: cookie "minauthator_jwt"
+
+# OAuth2 implicit flow (pre-granted app)
+GET {{ base_url }}/authorize
+[QueryStringParams]
+client_id: 00000001-0000-0000-0000-000000000001
+response_type: code
+redirect_uri: http://localhost:9090/callback
+state: Afk4kf6pbZkms78jM
+scope: openid profile email
+HTTP 302
+[Captures]
+authorization_code: header "Location" regex "\\?code=(.*)&"
+
+# OIDC Token exchange
+POST {{ base_url }}/api/token
+[BasicAuth]
+00000001-0000-0000-0000-000000000001: dummy_client_secret
+[FormParams]
+code: {{ authorization_code }}
+scope: user_read_basic
+redirect_uri: http://localhost:9090/callback
+grant_type: authorization_code
+HTTP 200
+Content-Type: application/json
+[Asserts]
+jsonpath "$.access_token" exists
+jsonpath "$.id_token" exists
+jsonpath "$.id_token" matches "eyJ[[:alpha:]0-9].[[:alpha:]0-9].[[:alpha:]0-9]"
+[Captures]
+id_token: jsonpath "$.id_token"
+
+# TODO: assert id_token JWT claims fields
+# TODO: contribute to hurl to add JWT extraction and assertion
+# See. https://github.com/Orange-OpenSource/hurl/issues/2223

tests/hurl_integration/scenario_1/config.toml

@@ -1,3 +1,5 @@
+signing_key = "tmp/secrets/signing.key"
+
 [instance]
 base_uri = "http://localhost:8086"
 name = "Example org"

tests/hurl_integration/scenario_1/main.hurl

@@ -27,7 +27,7 @@ handle: root
 email: root@johndoe.net
 full_name: John Doe
 website: https://johndoe.net
-picture: file,john_doe_profile_pic.jpg; image/jpeg
+avatar: file,john_doe_profile_pic.jpg; image/jpeg
 HTTP 200
 
 GET {{ base_url }}/me/authorizations

tests/hurl_integration/user_invitation_scenario/config.toml

@@ -1,3 +1,4 @@
+signing_key = "tmp/secrets/signing.key"
 applications = []
 
 roles = []