oauth/oidc

lib/sso_bsn_web/controllers/oauth/authorize_controller.ex

@@ -0,0 +1,90 @@
+defmodule SsoBsnWeb.Oauth.AuthorizeController do
+  @behaviour Boruta.Oauth.AuthorizeApplication
+
+  use SsoBsnWeb, :controller
+
+  alias Boruta.Oauth.AuthorizeResponse
+  alias Boruta.Oauth.Error
+  alias Boruta.Oauth.ResourceOwner
+  alias SsoBsnWeb.OauthView
+
+  def oauth_module, do: Application.get_env(:sso_bsn, :oauth_module, Boruta.Oauth)
+
+  def authorize(%Plug.Conn{} = conn, _params) do
+    current_user = conn.assigns[:current_user]
+    conn = store_user_return_to(conn)
+
+    authorize_response(
+      conn,
+      current_user
+    )
+  end
+
+  defp authorize_response(conn, %_{} = current_user) do
+    conn
+    |> oauth_module().authorize(
+      %ResourceOwner{sub: to_string(current_user.id), username: current_user.email},
+      __MODULE__
+    )
+  end
+
+  defp authorize_response(conn, _params) do
+    redirect_to_login(conn)
+  end
+
+  @impl Boruta.Oauth.AuthorizeApplication
+  def authorize_success(
+        conn,
+        %AuthorizeResponse{} = response
+      ) do
+    redirect(conn, external: AuthorizeResponse.redirect_to_url(response))
+  end
+
+  @impl Boruta.Oauth.AuthorizeApplication
+  def authorize_error(
+        %Plug.Conn{} = conn,
+        %Error{status: :unauthorized}
+      ) do
+    redirect_to_login(conn)
+  end
+
+  def authorize_error(
+        conn,
+        %Error{format: format} = error
+      )
+      when not is_nil(format) do
+    conn
+    |> redirect(external: Error.redirect_to_url(error))
+  end
+
+  def authorize_error(
+        conn,
+        %Error{status: status, error: error, error_description: error_description}
+      ) do
+    conn
+    |> put_status(status)
+    |> put_view(OauthView)
+    |> render("error.html", error: error, error_description: error_description)
+  end
+
+  @impl Boruta.Oauth.AuthorizeApplication
+  def preauthorize_success(_conn, _response), do: :ok
+
+  @impl Boruta.Oauth.AuthorizeApplication
+  def preauthorize_error(_conn, _response), do: :ok
+
+  defp store_user_return_to(conn) do
+    conn
+    |> put_session(
+      :user_return_to,
+      current_path(conn)
+    )
+  end
+
+  defp redirect_to_login(_conn) do
+    raise """
+    Here occurs the login process. After login, user may be redirected to
+    get_session(conn, :user_return_to)
+    """
+  end
+end

lib/sso_bsn_web/controllers/oauth/introspect_controller.ex

@@ -0,0 +1,64 @@
+defmodule SsoBsnWeb.Oauth.IntrospectController do
+  @behaviour Boruta.Oauth.IntrospectApplication
+
+  use SsoBsnWeb, :controller
+
+  alias Boruta.Oauth.Error
+  alias Boruta.Oauth.IntrospectResponse
+  alias SsoBsnWeb.OauthView
+
+  def oauth_module, do: Application.get_env(:sso_bsn, :oauth_module, Boruta.Oauth)
+
+  def introspect(%Plug.Conn{} = conn, _params) do
+    conn |> oauth_module().introspect(__MODULE__)
+  end
+
+  @impl Boruta.Oauth.IntrospectApplication
+  def introspect_success(conn, %IntrospectResponse{} = response) do
+    conn
+    |> put_view(OauthView)
+    |> introspect(response: response)
+  end
+
+  def introspect(%{
+        response: %IntrospectResponse{
+          active: active,
+          client_id: client_id,
+          username: username,
+          scope: scope,
+          sub: sub,
+          iss: iss,
+          exp: exp,
+          iat: iat
+        }
+      }) do
+    case active do
+      true ->
+        %{
+          active: true,
+          client_id: client_id,
+          username: username,
+          scope: scope,
+          sub: sub,
+          iss: iss,
+          exp: exp,
+          iat: iat
+        }
+
+      false ->
+        %{active: false}
+    end
+  end
+
+
+  @impl Boruta.Oauth.IntrospectApplication
+  def introspect_error(conn, %Error{
+        status: status,
+        error: error,
+        error_description: error_description
+      }) do
+    conn
+    |> put_status(status)
+    |> json(%{error: error, error_description: error_description})
+  end
+end

lib/sso_bsn_web/controllers/oauth/revoke_controller.ex

@@ -0,0 +1,31 @@
+defmodule SsoBsnWeb.Oauth.RevokeController do
+  @behaviour Boruta.Oauth.RevokeApplication
+
+  use SsoBsnWeb, :controller
+
+  alias Boruta.Oauth.Error
+  alias SsoBsnWeb.OauthView
+
+  def oauth_module, do: Application.get_env(:sso_bsn, :oauth_module, Boruta.Oauth)
+
+  def revoke(%Plug.Conn{} = conn, _params) do
+    conn |> oauth_module().revoke(__MODULE__)
+  end
+
+  @impl Boruta.Oauth.RevokeApplication
+  def revoke_success(%Plug.Conn{} = conn) do
+    send_resp(conn, 200, "")
+  end
+
+  @impl Boruta.Oauth.RevokeApplication
+  def revoke_error(conn, %Error{
+        status: status,
+        error: error,
+        error_description: error_description
+      }) do
+    conn
+    |> put_status(status)
+    |> put_view(OauthView)
+    |> json(%{error: error, error_description: error_description})
+  end
+end

lib/sso_bsn_web/controllers/oauth/token_controller.ex

@@ -0,0 +1,50 @@
+defmodule SsoBsnWeb.Oauth.TokenController do
+  @behaviour Boruta.Oauth.TokenApplication
+
+  use SsoBsnWeb, :controller
+
+  alias Boruta.Oauth.Error
+  alias Boruta.Oauth.TokenResponse
+
+  def oauth_module, do: Application.get_env(:sso_bsn, :oauth_module, Boruta.Oauth)
+
+  def token(%Plug.Conn{} = conn, _params) do
+    conn |> oauth_module().token(__MODULE__)
+  end
+
+  @impl Boruta.Oauth.TokenApplication
+  def token_success(conn, %TokenResponse{
+    token_type: token_type,
+    access_token: access_token,
+    expires_in: expires_in,
+    refresh_token: refresh_token,
+    id_token: id_token
+  }) do
+    conn
+    |> put_resp_header("pragma", "no-cache")
+    |> put_resp_header("cache-control", "no-store")
+    |> json(
+      %{
+        token_type: token_type,
+        access_token: access_token,
+        expires_in: expires_in,
+        refresh_token: refresh_token,
+        id_token: id_token
+      }
+      |> Enum.filter(
+        fn
+          {_key, nil} -> false
+          _ -> true
+        end
+      )
+      |> Enum.into(%{})
+    )
+  end
+
+  @impl Boruta.Oauth.TokenApplication
+  def token_error(conn, %Error{status: status, error: error, error_description: error_description}) do
+    conn
+    |> put_status(status)
+    |> json(%{error: error, error_description: error_description})
+  end
+end

lib/sso_bsn_web/controllers/openid/authorize_controller.ex

@@ -0,0 +1,159 @@
+defmodule SsoBsnWeb.Openid.AuthorizeController do
+  @behaviour Boruta.Oauth.AuthorizeApplication
+
+  use SsoBsnWeb, :controller
+
+  alias Boruta.Oauth.AuthorizeResponse
+  alias Boruta.Oauth.Error
+  alias Boruta.Oauth.ResourceOwner
+  alias SsoBsnWeb.UserAuth
+  alias SsoBsnWeb.Openid.AuthorizeView
+
+  def oauth_module, do: Application.get_env(:sso_bsn, :oauth_module, Boruta.Oauth)
+
+  def authorize(%Plug.Conn{} = conn, _params) do
+    conn =
+      conn
+      |> store_user_return_to()
+      |> put_unsigned_request()
+
+    resource_owner = get_resource_owner(conn)
+
+    with {:unchanged, conn} <- prompt_redirection(conn),
+         {:unchanged, conn} <- max_age_redirection(conn, resource_owner),
+         {:unchanged, conn} <- login_redirection(conn) do
+      oauth_module().authorize(conn, resource_owner, __MODULE__)
+    end
+  end
+
+  @impl Boruta.Oauth.AuthorizeApplication
+  def authorize_success(
+        conn,
+        %AuthorizeResponse{} = response
+      ) do
+    redirect(conn, external: AuthorizeResponse.redirect_to_url(response))
+  end
+
+  @impl Boruta.Oauth.AuthorizeApplication
+  def authorize_error(
+        %Plug.Conn{} = conn,
+        %Error{status: :unauthorized, error: :login_required} = error
+      ) do
+    redirect(conn, external: Error.redirect_to_url(error))
+  end
+
+  def authorize_error(
+        %Plug.Conn{} = conn,
+        %Error{status: :unauthorized, error: :invalid_resource_owner}
+      ) do
+    redirect_to_login(conn)
+  end
+
+  def authorize_error(
+        conn,
+        %Error{
+          format: format
+        } = error
+      )
+      when not is_nil(format) do
+    redirect(conn, external: Error.redirect_to_url(error))
+  end
+
+  def authorize_error(
+        conn,
+        %Error{status: status, error_description: error_description}
+      ) do
+    conn
+    |> put_status(status)
+    |> text(error_description)
+  end
+
+  defp put_unsigned_request(%Plug.Conn{query_params: query_params} = conn) do
+    unsigned_request_params =
+      with request <- Map.get(query_params, "request", ""),
+           {:ok, params} <- Joken.peek_claims(request) do
+        params
+      else
+        _ -> %{}
+      end
+
+    query_params = Map.merge(query_params, unsigned_request_params)
+
+    %{conn | query_params: query_params}
+  end
+
+  defp store_user_return_to(conn) do
+    # remove prompt and max_age params affecting redirections
+    conn
+    |> put_session(
+      :user_return_to,
+      current_path(conn)
+      |> String.replace(~r/prompt=(login|none)/, "")
+      |> String.replace(~r/max_age=(\d+)/, "")
+    )
+  end
+
+  defp prompt_redirection(%Plug.Conn{query_params: %{"prompt" => "login"}} = conn), do: log_out_user(conn)
+  defp prompt_redirection(%Plug.Conn{} = conn), do: {:unchanged, conn}
+
+  defp max_age_redirection(
+         %Plug.Conn{query_params: %{"max_age" => max_age}} = conn,
+         %ResourceOwner{} = resource_owner
+       ) do
+    case login_expired?(resource_owner, max_age) do
+      true ->
+        log_out_user(conn)
+
+      false ->
+        {:unchanged, conn}
+    end
+  end
+
+  defp max_age_redirection(%Plug.Conn{} = conn, _resource_owner), do: {:unchanged, conn}
+
+  defp login_expired?(%ResourceOwner{last_login_at: last_login_at}, max_age) do
+    now = DateTime.utc_now() |> DateTime.to_unix()
+
+    with "" <> max_age <- max_age,
+         {max_age, _} <- Integer.parse(max_age),
+         true <- now - DateTime.to_unix(last_login_at) >= max_age do
+      true
+    else
+      _ -> false
+    end
+  end
+
+  defp login_redirection(%Plug.Conn{assigns: %{current_user: _current_user}} = conn) do
+    {:unchanged, conn}
+  end
+
+  defp login_redirection(%Plug.Conn{query_params: %{"prompt" => "none"}} = conn) do
+    {:unchanged, conn}
+  end
+
+  defp login_redirection(%Plug.Conn{} = conn) do
+    redirect_to_login(conn)
+  end
+
+  defp get_resource_owner(conn) do
+    case conn.assigns[:current_user] do
+      nil ->
+        %ResourceOwner{sub: nil}
+
+      current_user ->
+        %ResourceOwner{
+          sub: to_string(current_user.id),
+          username: current_user.username,
+          last_login_at: current_user.last_login_at
+        }
+    end
+  end
+
+  defp redirect_to_login(conn) do
+    conn |> redirect(to: ~p"/users/log_in")
+  end
+
+  defp log_out_user(conn) do
+    UserAuth.log_out_user(conn)
+  end
+end

lib/sso_bsn_web/controllers/openid/configuration.ex

@@ -0,0 +1,11 @@
+defmodule SsoBsnWeb.Openid.ConfigurationController do
+	use SsoBsnWeb, :controller
+
+	def config(conn, _params) do
+		conn |> json(%{
+			issuer: url(~p"/"),
+			authorization_endpoint: url(~p"/openid/authorize"),
+			token_endpoint: url(~p"/oauth/token")
+		})
+	end
+end

lib/sso_bsn_web/controllers/openid/jwks_controller.ex

@@ -0,0 +1,16 @@
+defmodule SsoBsnWeb.Openid.JwksController do
+  @behaviour Boruta.Openid.JwksApplication
+
+  use SsoBsnWeb, :controller
+
+  def openid_module, do: Application.get_env(:sso_bsn, :openid_module, Boruta.Openid)
+
+  def jwks_index(conn, _params) do
+    openid_module().jwks(conn, __MODULE__)
+  end
+
+  @impl Boruta.Openid.JwksApplication
+  def jwk_list(conn, jwk_keys) do
+    conn |> json(%{keys: jwk_keys})
+  end
+end

lib/sso_bsn_web/controllers/openid/userinfo_controller.ex

@@ -0,0 +1,30 @@
+defmodule SsoBsnWeb.Openid.UserinfoController do
+  @behaviour Boruta.Openid.UserinfoApplication
+
+  use SsoBsnWeb, :controller
+
+  alias Boruta.Openid.UserinfoResponse
+
+  def openid_module, do: Application.get_env(:sso_bsn, :openid_module, Boruta.Openid)
+
+  def userinfo(conn, _params) do
+    openid_module().userinfo(conn, __MODULE__)
+  end
+
+  @impl Boruta.Openid.UserinfoApplication
+  def userinfo_fetched(conn, userinfo_response) do
+    conn
+    |> put_resp_header("content-type", UserinfoResponse.content_type(userinfo_response))
+    |> json(UserinfoResponse.payload(userinfo_response))
+  end
+
+  @impl Boruta.Openid.UserinfoApplication
+  def unauthorized(conn, error) do
+    conn
+    |> put_resp_header(
+      "www-authenticate",
+      "error=\"#{error.error}\", error_description=\"#{error.error_description}\""
+    )
+    |> send_resp(:unauthorized, "")
+  end
+end

lib/sso_bsn_web/resource_owners.ex

@@ -0,0 +1,39 @@
+defmodule SsoBsnWeb.ResourceOwners do
+	@behaviour Boruta.Oauth.ResourceOwners
+
+	alias Boruta.Oauth.ResourceOwner
+	alias SsoBsn.Accounts.User
+	alias SsoBsn.Accounts
+	alias SsoBsn.Repo
+
+	@impl Boruta.Oauth.ResourceOwners
+	def get_by(username: username) do
+	  with %User{ id: id, username: username, last_login_at: last_login_at } <- Accounts.get_user_by_username(username) do
+	    {:ok, %ResourceOwner{sub: to_string(id), username: username, last_login_at: last_login_at}}
+	  else
+	    _ -> {:error, "User not found."}
+	  end
+	end
+
+	def get_by(sub: sub) do
+	  with %User{id: id, username: username, last_login_at: last_login_at} <- Accounts.get_user(sub) do
+	    {:ok, %ResourceOwner{sub: to_string(id), username: username, last_login_at: last_login_at}}
+	  else
+	    _ -> {:error, "User not found."}
+	  end
+	end
+
+	@impl Boruta.Oauth.ResourceOwners
+	def check_password(_resource_owner, _password) do
+		raise """
+			Password auth is not supported
+		"""
+	end
+
+	@impl Boruta.Oauth.ResourceOwners
+	def authorized_scopes(%ResourceOwner{}), do: ["openid", "email", "profile"] |> Enum.map(&%{name: &1, id: &1})
+
+
+	@impl Boruta.Oauth.ResourceOwners
+	def claims(_resource_owner, _scope), do: %{}
+end

lib/sso_bsn_web/router.ex

@@ -73,4 +73,40 @@ defmodule SsoBsnWeb.Router do
 
     delete "/users/log_out", UserSessionController, :delete
   end
+
+
+  # OIDC
+  scope "/oauth", SsoBsnWeb.Oauth do
+    pipe_through :api
+
+    post "/revoke", RevokeController, :revoke
+    post "/token", TokenController, :token
+    post "/introspect", IntrospectController, :introspect
+  end
+
+
+  scope "/openid", SsoBsnWeb.Openid do
+    pipe_through :api
+
+    get "/userinfo", UserinfoController, :userinfo
+    post "/userinfo", UserinfoController, :userinfo
+    get "/jwks", JwksController, :jwks_index
+  end
+
+  scope "/oauth", SsoBsnWeb.Oauth do
+    pipe_through [:browser, :fetch_current_user]
+
+    get "/authorize", AuthorizeController, :authorize
+  end
+
+  scope "/openid", SsoBsnWeb.Openid do
+    pipe_through [:browser, :fetch_current_user]
+
+    get "/authorize", AuthorizeController, :authorize
+  end
+  
+  scope "/.well-known", SsoBsnWeb.Openid do
+    pipe_through :api
+    get "/openid-configuration", ConfigurationController, :config
+  end
 end

lib/sso_bsn_web/templates/oauth/error.html.eex

@@ -0,0 +1 @@
+<h2><%= @error_description %></h2>

lib/sso_bsn_web/user_auth.ex

@@ -27,6 +27,7 @@ defmodule SsoBsnWeb.UserAuth do
   """
   def log_in_user(conn, user, params \\ %{}) do
     token = Accounts.generate_user_session_token(user)
+    Accounts.update_login_time(user)
     user_return_to = get_session(conn, :user_return_to)
 
     conn
@@ -81,7 +82,7 @@ defmodule SsoBsnWeb.UserAuth do
     conn
     |> renew_session()
     |> delete_resp_cookie(@remember_me_cookie)
-    |> redirect(to: ~p"/")
+    |> redirect(to: ~p"/users/log_in")
   end
 
   @doc """