Add support for MFA with Duo's Universal Prompt (#4637)
* Add initial working Duo Universal Prompt support. * Add db schema and models for Duo 2FA state storage * store duo states in the database and validate during authentication * cleanup & comments * bump state/nonce length * replace stray use of TimeDelta * more cleanup * bind Duo oauth flow to device id, drop redundant device type handling * drop redundant alphanum string generation code * error handling cleanup * directly use JWT_VALIDITY_SECS constant instead of copying it to DuoClient instances * remove redundant explicit returns, rustfmt * rearrange constants, update comments, error message * override charset on duo state column to ascii for mysql * Reduce twofactor_duo_ctx state/nonce column size in postgres and maria * Add fixes suggested by clippy * rustfmt * Update to use the make_http_request * Don't handle OrganizationDuo * move Duo API endpoint fmt strings out of macros and into format! calls * Add missing indentation Co-authored-by: Daniel García <dani-garcia@users.noreply.github.com> * remove redundant expiry check when purging Duo contexts --------- Co-authored-by: BlackDex <black.dex@gmail.com> Co-authored-by: Daniel García <dani-garcia@users.noreply.github.com>pull/4772/head
0x0fbc
5 months ago
committed by
GitHub
parent
de66e56b6c
commit
b4b2701905
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DROP TABLE twofactor_duo_ctx;
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@ -0,0 +1,8 @@
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CREATE TABLE twofactor_duo_ctx (
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state VARCHAR(64) NOT NULL,
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user_email VARCHAR(255) NOT NULL,
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nonce VARCHAR(64) NOT NULL,
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exp BIGINT NOT NULL,
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PRIMARY KEY (state)
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);
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DROP TABLE twofactor_duo_ctx;
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@ -0,0 +1,8 @@
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CREATE TABLE twofactor_duo_ctx (
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state VARCHAR(64) NOT NULL,
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user_email VARCHAR(255) NOT NULL,
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nonce VARCHAR(64) NOT NULL,
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exp BIGINT NOT NULL,
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PRIMARY KEY (state)
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);
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@ -0,0 +1 @@
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DROP TABLE twofactor_duo_ctx;
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@ -0,0 +1,8 @@
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CREATE TABLE twofactor_duo_ctx (
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state TEXT NOT NULL,
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user_email TEXT NOT NULL,
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nonce TEXT NOT NULL,
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exp INTEGER NOT NULL,
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PRIMARY KEY (state)
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);
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@ -0,0 +1,500 @@
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use chrono::Utc;
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use data_encoding::HEXLOWER;
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use jsonwebtoken::{Algorithm, DecodingKey, EncodingKey, Header, Validation};
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use reqwest::{header, StatusCode};
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use ring::digest::{digest, Digest, SHA512_256};
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use serde::Serialize;
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use std::collections::HashMap;
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use crate::{
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api::{core::two_factor::duo::get_duo_keys_email, EmptyResult},
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crypto,
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db::{
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models::{EventType, TwoFactorDuoContext},
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DbConn, DbPool,
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},
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error::Error,
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http_client::make_http_request,
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CONFIG,
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};
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use url::Url;
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// The location on this service that Duo should redirect users to. For us, this is a bridge
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// built in to the Bitwarden clients.
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// See: https://github.com/bitwarden/clients/blob/main/apps/web/src/connectors/duo-redirect.ts
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const DUO_REDIRECT_LOCATION: &str = "duo-redirect-connector.html";
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// Number of seconds that a JWT we generate for Duo should be valid for.
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const JWT_VALIDITY_SECS: i64 = 300;
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// Number of seconds that a Duo context stored in the database should be valid for.
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const CTX_VALIDITY_SECS: i64 = 300;
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// Expected algorithm used by Duo to sign JWTs.
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const DUO_RESP_SIGNATURE_ALG: Algorithm = Algorithm::HS512;
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// Signature algorithm we're using to sign JWTs for Duo. Must be either HS512 or HS256.
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const JWT_SIGNATURE_ALG: Algorithm = Algorithm::HS512;
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// Size of random strings for state and nonce. Must be at least 16 characters and at most 1024 characters.
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// If increasing this above 64, also increase the size of the twofactor_duo_ctx.state and
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// twofactor_duo_ctx.nonce database columns for postgres and mariadb.
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const STATE_LENGTH: usize = 64;
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// client_assertion payload for health checks and obtaining MFA results.
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#[derive(Debug, Serialize, Deserialize)]
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struct ClientAssertion {
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pub iss: String,
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pub sub: String,
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pub aud: String,
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pub exp: i64,
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pub jti: String,
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pub iat: i64,
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}
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// authorization request payload sent with clients to Duo for MFA
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#[derive(Debug, Serialize, Deserialize)]
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struct AuthorizationRequest {
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pub response_type: String,
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pub scope: String,
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pub exp: i64,
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pub client_id: String,
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pub redirect_uri: String,
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pub state: String,
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pub duo_uname: String,
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pub iss: String,
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pub aud: String,
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pub nonce: String,
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}
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// Duo service health check responses
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#[derive(Debug, Serialize, Deserialize)]
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#[serde(untagged)]
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enum HealthCheckResponse {
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HealthOK {
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stat: String,
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},
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HealthFail {
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message: String,
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message_detail: String,
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},
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}
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// Outer structure of response when exchanging authz code for MFA results
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#[derive(Debug, Serialize, Deserialize)]
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struct IdTokenResponse {
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id_token: String, // IdTokenClaims
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access_token: String,
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expires_in: i64,
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token_type: String,
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}
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// Inner structure of IdTokenResponse.id_token
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#[derive(Debug, Serialize, Deserialize)]
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struct IdTokenClaims {
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preferred_username: String,
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nonce: String,
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}
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// Duo OIDC Authorization Client
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// See https://duo.com/docs/oauthapi
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struct DuoClient {
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client_id: String, // Duo Client ID (DuoData.ik)
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client_secret: String, // Duo Client Secret (DuoData.sk)
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api_host: String, // Duo API hostname (DuoData.host)
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redirect_uri: String, // URL in this application clients should call for MFA verification
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}
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impl DuoClient {
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// Construct a new DuoClient
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fn new(client_id: String, client_secret: String, api_host: String, redirect_uri: String) -> DuoClient {
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DuoClient {
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client_id,
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client_secret,
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api_host,
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redirect_uri,
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}
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}
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// Generate a client assertion for health checks and authorization code exchange.
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fn new_client_assertion(&self, url: &str) -> ClientAssertion {
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let now = Utc::now().timestamp();
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let jwt_id = crypto::get_random_string_alphanum(STATE_LENGTH);
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ClientAssertion {
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iss: self.client_id.clone(),
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sub: self.client_id.clone(),
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aud: url.to_string(),
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exp: now + JWT_VALIDITY_SECS,
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jti: jwt_id,
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iat: now,
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}
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}
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// Given a serde-serializable struct, attempt to encode it as a JWT
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fn encode_duo_jwt<T: Serialize>(&self, jwt_payload: T) -> Result<String, Error> {
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match jsonwebtoken::encode(
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&Header::new(JWT_SIGNATURE_ALG),
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&jwt_payload,
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&EncodingKey::from_secret(self.client_secret.as_bytes()),
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) {
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Ok(token) => Ok(token),
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Err(e) => err!(format!("Error encoding Duo JWT: {e:?}")),
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}
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}
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// "required" health check to verify the integration is configured and Duo's services
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// are up.
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// https://duo.com/docs/oauthapi#health-check
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async fn health_check(&self) -> Result<(), Error> {
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let health_check_url: String = format!("https://{}/oauth/v1/health_check", self.api_host);
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let jwt_payload = self.new_client_assertion(&health_check_url);
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let token = match self.encode_duo_jwt(jwt_payload) {
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Ok(token) => token,
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Err(e) => return Err(e),
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};
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let mut post_body = HashMap::new();
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post_body.insert("client_assertion", token);
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post_body.insert("client_id", self.client_id.clone());
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let res = match make_http_request(reqwest::Method::POST, &health_check_url)?
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.header(header::USER_AGENT, "vaultwarden:Duo/2.0 (Rust)")
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.form(&post_body)
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.send()
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.await
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{
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Ok(r) => r,
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Err(e) => err!(format!("Error requesting Duo health check: {e:?}")),
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};
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let response: HealthCheckResponse = match res.json::<HealthCheckResponse>().await {
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Ok(r) => r,
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Err(e) => err!(format!("Duo health check response decode error: {e:?}")),
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};
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let health_stat: String = match response {
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HealthCheckResponse::HealthOK {
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stat,
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} => stat,
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HealthCheckResponse::HealthFail {
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message,
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message_detail,
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} => err!(format!("Duo health check FAIL response, msg: {}, detail: {}", message, message_detail)),
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};
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if health_stat != "OK" {
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err!(format!("Duo health check failed, got OK-like body with stat {health_stat}"));
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}
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Ok(())
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}
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// Constructs the URL for the authorization request endpoint on Duo's service.
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// Clients are sent here to continue authentication.
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// https://duo.com/docs/oauthapi#authorization-request
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fn make_authz_req_url(&self, duo_username: &str, state: String, nonce: String) -> Result<String, Error> {
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let now = Utc::now().timestamp();
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let jwt_payload = AuthorizationRequest {
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response_type: String::from("code"),
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scope: String::from("openid"),
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exp: now + JWT_VALIDITY_SECS,
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client_id: self.client_id.clone(),
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redirect_uri: self.redirect_uri.clone(),
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state,
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duo_uname: String::from(duo_username),
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iss: self.client_id.clone(),
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aud: format!("https://{}", self.api_host),
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nonce,
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};
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let token = match self.encode_duo_jwt(jwt_payload) {
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Ok(token) => token,
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Err(e) => return Err(e),
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};
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let authz_endpoint = format!("https://{}/oauth/v1/authorize", self.api_host);
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let mut auth_url = match Url::parse(authz_endpoint.as_str()) {
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Ok(url) => url,
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Err(e) => err!(format!("Error parsing Duo authorization URL: {e:?}")),
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};
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{
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let mut query_params = auth_url.query_pairs_mut();
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query_params.append_pair("response_type", "code");
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query_params.append_pair("client_id", self.client_id.as_str());
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query_params.append_pair("request", token.as_str());
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}
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let final_auth_url = auth_url.to_string();
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Ok(final_auth_url)
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}
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// Exchange the authorization code obtained from an access token provided by the user
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// for the result of the MFA and validate.
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// See: https://duo.com/docs/oauthapi#access-token (under Response Format)
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async fn exchange_authz_code_for_result(
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&self,
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duo_code: &str,
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duo_username: &str,
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nonce: &str,
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) -> Result<(), Error> {
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if duo_code.is_empty() {
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err!("Empty Duo authorization code")
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}
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let token_url = format!("https://{}/oauth/v1/token", self.api_host);
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let jwt_payload = self.new_client_assertion(&token_url);
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let token = match self.encode_duo_jwt(jwt_payload) {
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Ok(token) => token,
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Err(e) => return Err(e),
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};
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let mut post_body = HashMap::new();
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post_body.insert("grant_type", String::from("authorization_code"));
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post_body.insert("code", String::from(duo_code));
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// Must be the same URL that was supplied in the authorization request for the supplied duo_code
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post_body.insert("redirect_uri", self.redirect_uri.clone());
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post_body
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.insert("client_assertion_type", String::from("urn:ietf:params:oauth:client-assertion-type:jwt-bearer"));
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post_body.insert("client_assertion", token);
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let res = match make_http_request(reqwest::Method::POST, &token_url)?
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.header(header::USER_AGENT, "vaultwarden:Duo/2.0 (Rust)")
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.form(&post_body)
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.send()
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.await
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{
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Ok(r) => r,
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Err(e) => err!(format!("Error exchanging Duo code: {e:?}")),
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};
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let status_code = res.status();
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if status_code != StatusCode::OK {
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err!(format!("Failure response from Duo: {}", status_code))
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}
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let response: IdTokenResponse = match res.json::<IdTokenResponse>().await {
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Ok(r) => r,
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Err(e) => err!(format!("Error decoding ID token response: {e:?}")),
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};
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let mut validation = Validation::new(DUO_RESP_SIGNATURE_ALG);
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validation.set_required_spec_claims(&["exp", "aud", "iss"]);
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validation.set_audience(&[&self.client_id]);
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validation.set_issuer(&[token_url.as_str()]);
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let token_data = match jsonwebtoken::decode::<IdTokenClaims>(
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&response.id_token,
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&DecodingKey::from_secret(self.client_secret.as_bytes()),
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&validation,
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) {
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Ok(c) => c,
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Err(e) => err!(format!("Failed to decode Duo token {e:?}")),
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};
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let matching_nonces = crypto::ct_eq(nonce, &token_data.claims.nonce);
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let matching_usernames = crypto::ct_eq(duo_username, &token_data.claims.preferred_username);
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if !(matching_nonces && matching_usernames) {
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err!("Error validating Duo authorization, nonce or username mismatch.")
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};
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Ok(())
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}
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}
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struct DuoAuthContext {
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pub state: String,
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pub user_email: String,
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pub nonce: String,
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pub exp: i64,
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}
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// Given a state string, retrieve the associated Duo auth context and
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// delete the retrieved state from the database.
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async fn extract_context(state: &str, conn: &mut DbConn) -> Option<DuoAuthContext> {
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let ctx: TwoFactorDuoContext = match TwoFactorDuoContext::find_by_state(state, conn).await {
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Some(c) => c,
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None => return None,
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};
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if ctx.exp < Utc::now().timestamp() {
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ctx.delete(conn).await.ok();
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return None;
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}
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// Copy the context data, so that we can delete the context from
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// the database before returning.
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let ret_ctx = DuoAuthContext {
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state: ctx.state.clone(),
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user_email: ctx.user_email.clone(),
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nonce: ctx.nonce.clone(),
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exp: ctx.exp,
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};
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ctx.delete(conn).await.ok();
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Some(ret_ctx)
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}
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// Task to clean up expired Duo authentication contexts that may have accumulated in the database.
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pub async fn purge_duo_contexts(pool: DbPool) {
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debug!("Purging Duo authentication contexts");
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if let Ok(mut conn) = pool.get().await {
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TwoFactorDuoContext::purge_expired_duo_contexts(&mut conn).await;
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} else {
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error!("Failed to get DB connection while purging expired Duo authentications")
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}
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}
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// Construct the url that Duo should redirect users to.
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fn make_callback_url(client_name: &str) -> Result<String, Error> {
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// Get the location of this application as defined in the config.
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let base = match Url::parse(CONFIG.domain().as_str()) {
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Ok(url) => url,
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Err(e) => err!(format!("Error parsing configured domain URL (check your domain configuration): {e:?}")),
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};
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// Add the client redirect bridge location
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let mut callback = match base.join(DUO_REDIRECT_LOCATION) {
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Ok(url) => url,
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Err(e) => err!(format!("Error constructing Duo redirect URL (check your domain configuration): {e:?}")),
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};
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// Add the 'client' string with the authenticating device type. The callback connector uses this
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// information to figure out how it should handle certain clients.
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{
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let mut query_params = callback.query_pairs_mut();
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query_params.append_pair("client", client_name);
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}
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Ok(callback.to_string())
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}
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// Pre-redirect first stage of the Duo OIDC authentication flow.
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// Returns the "AuthUrl" that should be returned to clients for MFA.
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pub async fn get_duo_auth_url(
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email: &str,
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client_id: &str,
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device_identifier: &String,
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conn: &mut DbConn,
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) -> Result<String, Error> {
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let (ik, sk, _, host) = get_duo_keys_email(email, conn).await?;
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let callback_url = match make_callback_url(client_id) {
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Ok(url) => url,
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Err(e) => return Err(e),
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};
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let client = DuoClient::new(ik, sk, host, callback_url);
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match client.health_check().await {
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Ok(()) => {}
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Err(e) => return Err(e),
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};
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// Generate random OAuth2 state and OIDC Nonce
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let state: String = crypto::get_random_string_alphanum(STATE_LENGTH);
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let nonce: String = crypto::get_random_string_alphanum(STATE_LENGTH);
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// Bind the nonce to the device that's currently authing by hashing the nonce and device id
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// and sending the result as the OIDC nonce.
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let d: Digest = digest(&SHA512_256, format!("{nonce}{device_identifier}").as_bytes());
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let hash: String = HEXLOWER.encode(d.as_ref());
|
||||
|
||||
match TwoFactorDuoContext::save(state.as_str(), email, nonce.as_str(), CTX_VALIDITY_SECS, conn).await {
|
||||
Ok(()) => client.make_authz_req_url(email, state, hash),
|
||||
Err(e) => err!(format!("Error saving Duo authentication context: {e:?}")),
|
||||
}
|
||||
}
|
||||
|
||||
// Post-redirect second stage of the Duo OIDC authentication flow.
|
||||
// Exchanges an authorization code for the MFA result with Duo's API and validates the result.
|
||||
pub async fn validate_duo_login(
|
||||
email: &str,
|
||||
two_factor_token: &str,
|
||||
client_id: &str,
|
||||
device_identifier: &str,
|
||||
conn: &mut DbConn,
|
||||
) -> EmptyResult {
|
||||
let email = &email.to_lowercase();
|
||||
|
||||
// Result supplied to us by clients in the form "<authz code>|<state>"
|
||||
let split: Vec<&str> = two_factor_token.split('|').collect();
|
||||
if split.len() != 2 {
|
||||
err!(
|
||||
"Invalid response length",
|
||||
ErrorEvent {
|
||||
event: EventType::UserFailedLogIn2fa
|
||||
}
|
||||
);
|
||||
}
|
||||
|
||||
let code = split[0];
|
||||
let state = split[1];
|
||||
|
||||
let (ik, sk, _, host) = get_duo_keys_email(email, conn).await?;
|
||||
|
||||
// Get the context by the state reported by the client. If we don't have one,
|
||||
// it means the context is either missing or expired.
|
||||
let ctx = match extract_context(state, conn).await {
|
||||
Some(c) => c,
|
||||
None => {
|
||||
err!(
|
||||
"Error validating duo authentication",
|
||||
ErrorEvent {
|
||||
event: EventType::UserFailedLogIn2fa
|
||||
}
|
||||
)
|
||||
}
|
||||
};
|
||||
|
||||
// Context validation steps
|
||||
let matching_usernames = crypto::ct_eq(email, &ctx.user_email);
|
||||
|
||||
// Probably redundant, but we're double-checking them anyway.
|
||||
let matching_states = crypto::ct_eq(state, &ctx.state);
|
||||
let unexpired_context = ctx.exp > Utc::now().timestamp();
|
||||
|
||||
if !(matching_usernames && matching_states && unexpired_context) {
|
||||
err!(
|
||||
"Error validating duo authentication",
|
||||
ErrorEvent {
|
||||
event: EventType::UserFailedLogIn2fa
|
||||
}
|
||||
)
|
||||
}
|
||||
|
||||
let callback_url = match make_callback_url(client_id) {
|
||||
Ok(url) => url,
|
||||
Err(e) => return Err(e),
|
||||
};
|
||||
|
||||
let client = DuoClient::new(ik, sk, host, callback_url);
|
||||
|
||||
match client.health_check().await {
|
||||
Ok(()) => {}
|
||||
Err(e) => return Err(e),
|
||||
};
|
||||
|
||||
let d: Digest = digest(&SHA512_256, format!("{}{}", ctx.nonce, device_identifier).as_bytes());
|
||||
let hash: String = HEXLOWER.encode(d.as_ref());
|
||||
|
||||
match client.exchange_authz_code_for_result(code, email, hash.as_str()).await {
|
||||
Ok(_) => Ok(()),
|
||||
Err(_) => {
|
||||
err!(
|
||||
"Error validating duo authentication",
|
||||
ErrorEvent {
|
||||
event: EventType::UserFailedLogIn2fa
|
||||
}
|
||||
)
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,84 @@
|
||||
use chrono::Utc;
|
||||
|
||||
use crate::{api::EmptyResult, db::DbConn, error::MapResult};
|
||||
|
||||
db_object! {
|
||||
#[derive(Identifiable, Queryable, Insertable, AsChangeset)]
|
||||
#[diesel(table_name = twofactor_duo_ctx)]
|
||||
#[diesel(primary_key(state))]
|
||||
pub struct TwoFactorDuoContext {
|
||||
pub state: String,
|
||||
pub user_email: String,
|
||||
pub nonce: String,
|
||||
pub exp: i64,
|
||||
}
|
||||
}
|
||||
|
||||
impl TwoFactorDuoContext {
|
||||
pub async fn find_by_state(state: &str, conn: &mut DbConn) -> Option<Self> {
|
||||
db_run! {
|
||||
conn: {
|
||||
twofactor_duo_ctx::table
|
||||
.filter(twofactor_duo_ctx::state.eq(state))
|
||||
.first::<TwoFactorDuoContextDb>(conn)
|
||||
.ok()
|
||||
.from_db()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub async fn save(state: &str, user_email: &str, nonce: &str, ttl: i64, conn: &mut DbConn) -> EmptyResult {
|
||||
// A saved context should never be changed, only created or deleted.
|
||||
let exists = Self::find_by_state(state, conn).await;
|
||||
if exists.is_some() {
|
||||
return Ok(());
|
||||
};
|
||||
|
||||
let exp = Utc::now().timestamp() + ttl;
|
||||
|
||||
db_run! {
|
||||
conn: {
|
||||
diesel::insert_into(twofactor_duo_ctx::table)
|
||||
.values((
|
||||
twofactor_duo_ctx::state.eq(state),
|
||||
twofactor_duo_ctx::user_email.eq(user_email),
|
||||
twofactor_duo_ctx::nonce.eq(nonce),
|
||||
twofactor_duo_ctx::exp.eq(exp)
|
||||
))
|
||||
.execute(conn)
|
||||
.map_res("Error saving context to twofactor_duo_ctx")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub async fn find_expired(conn: &mut DbConn) -> Vec<Self> {
|
||||
let now = Utc::now().timestamp();
|
||||
db_run! {
|
||||
conn: {
|
||||
twofactor_duo_ctx::table
|
||||
.filter(twofactor_duo_ctx::exp.lt(now))
|
||||
.load::<TwoFactorDuoContextDb>(conn)
|
||||
.expect("Error finding expired contexts in twofactor_duo_ctx")
|
||||
.from_db()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub async fn delete(&self, conn: &mut DbConn) -> EmptyResult {
|
||||
db_run! {
|
||||
conn: {
|
||||
diesel::delete(
|
||||
twofactor_duo_ctx::table
|
||||
.filter(twofactor_duo_ctx::state.eq(&self.state)))
|
||||
.execute(conn)
|
||||
.map_res("Error deleting from twofactor_duo_ctx")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub async fn purge_expired_duo_contexts(conn: &mut DbConn) {
|
||||
for context in Self::find_expired(conn).await {
|
||||
context.delete(conn).await.ok();
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in new issue