Add generic OIDC authentication flow (#6781)

- Added a generic authentication flow for OIDC.
- Modified some templates to display OIDC login button.
- Added new env variables to support the OIDC auth flow. Mainly, OIDC
  discovery endpoint is configurable now.
- Added new routs for OIDC auth.
- Manually tested same flow with Google (without domain verification) and AWS Cognito.

redash/authentication/__init__.py

@@ -242,6 +242,7 @@ def init_app(app):
     from redash.authentication.google_oauth import (
         create_google_oauth_blueprint,
     )
+    from redash.authentication.oidc import create_oidc_blueprint
 
     login_manager.init_app(app)
     login_manager.anonymous_user = models.AnonymousUser
@@ -257,12 +258,14 @@ def extend_session():
     # Authlib's flask oauth client requires a Flask app to initialize
     for blueprint in [
         create_google_oauth_blueprint(app),
+        create_oidc_blueprint(app),
         saml_auth.blueprint,
         remote_user_auth.blueprint,
         ldap_auth.blueprint,
     ]:
-        csrf.exempt(blueprint)
-        app.register_blueprint(blueprint)
+        if blueprint:
+            csrf.exempt(blueprint)
+            app.register_blueprint(blueprint)
 
     user_logged_in.connect(log_user_logged_in)
     login_manager.request_loader(request_loader)

redash/authentication/oidc.py

@@ -0,0 +1,106 @@
+import logging
+
+import requests
+from authlib.integrations.flask_client import OAuth
+from flask import Blueprint, flash, redirect, request, session, url_for
+
+from redash import models, settings
+from redash.authentication import (
+    create_and_login_user,
+    get_next_path,
+    logout_and_redirect_to_index,
+)
+from redash.authentication.org_resolving import current_org
+
+
+def create_oidc_blueprint(app):
+    if not settings.OIDC_ENABLED:
+        return None
+
+    oauth = OAuth(app)
+
+    logger = logging.getLogger("oidc")
+    blueprint = Blueprint("oidc", __name__)
+
+    def get_oidc_config(url):
+        resp = requests.get(url=url)
+        if resp.status_code != 200:
+            logger.warning(
+                f"Unable to get configuration details (response code {resp.status_code}). Configuration URL: {url}"
+            )
+            return None
+        return resp.json()
+
+    oidc_config = get_oidc_config(settings.OIDC_COFIGURATION_URL)
+    oauth = OAuth(app)
+    oauth.register(
+        name="oidc",
+        server_metadata_url=settings.OIDC_COFIGURATION_URL,
+        client_kwargs={
+            "scope": "openid email profile",
+        },
+    )
+
+    def get_user_profile(access_token):
+        headers = {"Authorization": "Bearer {}".format(access_token)}
+        response = requests.get(oidc_config["userinfo_endpoint"], headers=headers)
+
+        if response.status_code == 401:
+            logger.warning("Failed getting user profile (response code 401).")
+            return None
+
+        return response.json()
+
+    @blueprint.route("/<org_slug>/oidc", endpoint="authorize_org")
+    def org_login(org_slug):
+        session["org_slug"] = current_org.slug
+        return redirect(url_for(".authorize", next=request.args.get("next", None)))
+
+    @blueprint.route("/oidc", endpoint="authorize")
+    def login():
+        redirect_uri = url_for(".callback", _external=True)
+
+        next_path = request.args.get("next", url_for("redash.index", org_slug=session.get("org_slug")))
+        logger.debug("Callback url: %s", redirect_uri)
+        logger.debug("Next is: %s", next_path)
+
+        session["next_url"] = next_path
+
+        return oauth.oidc.authorize_redirect(redirect_uri)
+
+    @blueprint.route("/oidc/callback", endpoint="callback")
+    def authorized():
+        logger.debug("Authorized user inbound")
+
+        resp = oauth.oidc.authorize_access_token()
+        user = resp.get("userinfo")
+        if user:
+            session["user"] = user
+
+        access_token = resp["access_token"]
+
+        if access_token is None:
+            logger.warning("Access token missing in call back request.")
+            flash("Validation error. Please retry.")
+            return redirect(url_for("redash.login"))
+
+        profile = get_user_profile(access_token)
+        if profile is None:
+            flash("Validation error. Please retry.")
+            return redirect(url_for("redash.login"))
+
+        if "org_slug" in session:
+            org = models.Organization.get_by_slug(session.pop("org_slug"))
+        else:
+            org = current_org
+
+        user = create_and_login_user(org, profile["name"], profile["email"])
+        if user is None:
+            return logout_and_redirect_to_index()
+
+        unsafe_next_path = session.get("next_url") or url_for("redash.index", org_slug=org.slug)
+        next_path = get_next_path(unsafe_next_path)
+
+        return redirect(next_path)
+
+    return blueprint

redash/handlers/authentication.py

@@ -28,6 +28,16 @@ def get_google_auth_url(next_path):
     return google_auth_url
 
 
+def get_oidc_auth_url(next_path):
+    if not settings.OIDC_ENABLED:
+        return None
+    if settings.MULTI_ORG:
+        oidc_auth_url = url_for("oidc.authorize_org", next=next_path, org_slug=current_org.slug)
+    else:
+        oidc_auth_url = url_for("oidc.authorize", next=next_path)
+    return oidc_auth_url
+
+
 def render_token_login_page(template, org_slug, token, invite):
     try:
         user_id = validate_token(token)
@@ -89,12 +99,15 @@ def render_token_login_page(template, org_slug, token, invite):
             return redirect(url_for("redash.index", org_slug=org_slug))
 
     google_auth_url = get_google_auth_url(url_for("redash.index", org_slug=org_slug))
+    oidc_auth_url = get_oidc_auth_url(url_for("redash.index", org_slug=org_slug))
 
     return (
         render_template(
             template,
             show_google_openid=settings.GOOGLE_OAUTH_ENABLED,
+            show_oidc_login=settings.OIDC_ENABLED,
             google_auth_url=google_auth_url,
+            oidc_auth_url=oidc_auth_url,
             show_saml_login=current_org.get_setting("auth_saml_enabled"),
             show_remote_user_login=settings.REMOTE_USER_LOGIN_ENABLED,
             show_ldap_login=settings.LDAP_LOGIN_ENABLED,
@@ -204,14 +217,17 @@ def login(org_slug=None):
         flash("Password login is not enabled for your organization.")
 
     google_auth_url = get_google_auth_url(next_path)
+    oidc_auth_url = get_oidc_auth_url(next_path)
 
     return render_template(
         "login.html",
         org_slug=org_slug,
         next=next_path,
         email=request.form.get("email", ""),
         show_google_openid=settings.GOOGLE_OAUTH_ENABLED,
+        show_oidc_login=settings.OIDC_ENABLED,
         google_auth_url=google_auth_url,
+        oidc_auth_url=oidc_auth_url,
         show_password_login=current_org.get_setting("auth_password_login_enabled"),
         show_saml_login=current_org.get_setting("auth_saml_enabled"),
         show_remote_user_login=settings.REMOTE_USER_LOGIN_ENABLED,

redash/settings/__init__.py

@@ -138,6 +138,11 @@
 GOOGLE_CLIENT_SECRET = os.environ.get("REDASH_GOOGLE_CLIENT_SECRET", "")
 GOOGLE_OAUTH_ENABLED = bool(GOOGLE_CLIENT_ID and GOOGLE_CLIENT_SECRET)
 
+OIDC_CLIENT_ID = os.environ.get("REDASH_OIDC_CLIENT_ID", "")
+OIDC_CLIENT_SECRET = os.environ.get("REDASH_OIDC_CLIENT_SECRET", "")
+OIDC_COFIGURATION_URL = os.environ.get("REDASH_OIDC_COFIGURATION_URL", "")
+OIDC_ENABLED = bool(OIDC_CLIENT_ID and OIDC_CLIENT_SECRET and OIDC_COFIGURATION_URL)
+
 # If Redash is behind a proxy it might sometimes receive a X-Forwarded-Proto of HTTP
 # even if your actual Redash URL scheme is HTTPS. This will cause Flask to build
 # the SAML redirect URL incorrect thus failing auth. This is especially common if

redash/templates/invite.html

@@ -6,7 +6,7 @@
 <div class="fixed-width-page">
   <div class="bg-white tiled">
     <div class="m-b-25">
-      {% if show_google_openid or show_saml_login or show_remote_user_login or show_ldap_login %}
+      {% if show_google_openid or show_oidc_login or show_saml_login or show_remote_user_login or show_ldap_login %}
         To create your account, please choose a password or login with your SSO provider.
       {% else %}
         To create your account, please choose a password.
@@ -28,6 +28,13 @@
       </a>
     {% endif %}
 
+    {% if show_oidc_login %}
+      <a href="{{ oidc_auth_url }}" class="login-button btn btn-default btn-block">
+        <img src="/static/images/openid.svg">
+        Login with OIDC
+      </a>
+    {% endif %}
+
     {% if show_saml_login %}
       <a href="{{ url_for('saml_auth.sp_initiated', org_slug=org_slug) }}" class="login-button btn btn-default btn-block">SAML Login</a>
     {% endif %}

redash/templates/login.html

@@ -20,6 +20,13 @@
       </a>
     {% endif %}
 
+    {% if show_oidc_login %}
+      <a href="{{ oidc_auth_url }}" class="login-button btn btn-default btn-block">
+        <img src="/static/images/openid.svg">
+        Login with OIDC
+      </a>
+    {% endif %}
+
     {% if show_saml_login %}
       <a href="{{ url_for('saml_auth.sp_initiated', org_slug=org_slug, next=next) }}" class="login-button btn btn-default btn-block">SAML Login</a>
     {% endif %}