springboot-security-jwt/blog.md at d89bd1a4adcd1b45f979a1d1728eeb440b8a2806

svlada d89bd1a4ad Working on blog post.

2016-08-25 15:58:22 +02:00

21 KiB

Raw Blame History

+---main
|   +---java
|   |   \---com
|   |       \---svlada
|   |           +---common
|   |           +---entity
|   |           +---profile
|   |           |   \---endpoint
|   |           +---security
|   |           |   +---auth
|   |           |   |   +---ajax
|   |           |   |   \---jwt
|   |           |   |       +---extractor
|   |           |   |       \---verifier
|   |           |   +---config
|   |           |   +---endpoint
|   |           |   +---exceptions
|   |           |   \---model
|   |           |       \---token
|   |           \---user
|   |               +---repository
|   |               \---service
|   \---resources
|       +---static
|       \---templates

By default Spring Security has a number of authentication filters implemented and configured in Spring Security filter chain. However support for Ajax authentication is not available out of box. In the first part of this tutorial we will implement Ajax authentication by following standard patterns found in Spring Security framework.

When we think about Ajax authentication we usually mean about process where user is supplying credentials through JSON payload and sending it as a part of XMLHttpRequest.

Following is the list of components that we'll implement as part of this tutorial:

AjaxLoginProcessingFilter
AjaxAuthenticationProvider
AjaxAwareAuthenticationSuccessHandler
AjaxAwareAuthenticationFailureHandler
RestAuthenticationEntryPoint implements
WebSecurityConfig

Before we dive into the implementation details let's look at the high level picture of what we want to achieve.

Ajax authentication request example

Client initiates authentication process by invoking Authentication API endpoint(/api/auth/login). Please note that credentials should be included as a part of request body in a form of JSON payload.

Raw HTTP request:

POST /api/auth/login HTTP/1.1
Host: localhost:9966
X-Requested-With: XMLHttpRequest
Content-Type: application/json
Cache-Control: no-cache

{
    "username": "svlada@gmail.com",
    "password": "test1234"
}

CURL command:

curl -X POST -H "X-Requested-With: XMLHttpRequest" -H "Content-Type: application/json" -H "Cache-Control: no-cache" -d '{
    "username": "svlada@gmail.com",
    "password": "test1234"
}' "http://localhost:9966/api/auth/login"

Ajax authentication response example

Authentication API will validate client supplied credentials. If credentials are valid, Authentication API will send HTTP response with the following details:

HTTP status "200 OK"
JWT Access token and Refresh token will be included in JSON Payload as a part of HTTP Response.

JWT Access token - it will be used to authenticate against protected API resources. It must be set in "X-Authorization" header. JWT Refresh token - it will be used to acquire new Access Token. Following API endpoint /api/auth/token is handling refresh token.

Raw HTTP Response:

{
  "token": "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJzdmxhZGFAZ21haWwuY29tIiwic2NvcGVzIjpbIlJPTEVfQURNSU4iLCJST0xFX1BSRU1JVU1fTUVNQkVSIl0sImlzcyI6Imh0dHA6Ly9zdmxhZGEuY29tIiwiaWF0IjoxNDcyMDMzMzA4LCJleHAiOjE0NzIwMzQyMDh9.41rxtplFRw55ffqcw1Fhy2pnxggssdWUU8CDOherC0Kw4sgt3-rw_mPSWSgQgsR0NLndFcMPh7LSQt5mkYqROQ",
  
  "refreshToken": "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJzdmxhZGFAZ21haWwuY29tIiwic2NvcGVzIjpbIlJPTEVfUkVGUkVTSF9UT0tFTiJdLCJpc3MiOiJodHRwOi8vc3ZsYWRhLmNvbSIsImp0aSI6IjkwYWZlNzhjLTFkMmUtNDg2OS1hNzdlLTFkNzU0YjYwZTBjZSIsImlhdCI6MTQ3MjAzMzMwOCwiZXhwIjoxNDcyMDM2OTA4fQ.SEEG60YRznBB2O7Gn_5X6YbRmyB3ml4hnpSOxqkwQUFtqA6MZo7_n2Am2QhTJBJA1Ygv74F2IxiLv0urxGLQjg"
}

JWT Access Token

JWT Access Token is used for for authentication and authorization of API request.

The API Request authentication is performed by validating JWT Access Token signature. If signature proves to be valid, access to requested resource is granted.

The API Request will be authorized and appropriate privileges will be granted based on privileges found in scope attribute of JWT Access Token.

Decoded JWT Access Token has three parts: Header, Claims and Signature as shown below:

Header


{
    "alg": "HS512"
}

Claims

{
  "sub": "svlada@gmail.com",
  "scopes": [
    "ROLE_ADMIN",
    "ROLE_PREMIUM_MEMBER"
  ],
  "iss": "http://svlada.com",
  "iat": 1472033308,
  "exp": 1472034208
}

Signature (base64 encoded)

41rxtplFRw55ffqcw1Fhy2pnxggssdWUU8CDOherC0Kw4sgt3-rw_mPSWSgQgsR0NLndFcMPh7LSQt5mkYqROQ

JWT Refresh Token

JWT Refresh Token is used for requesting new Access Tokens.

{ "alg": "HS512" }

{ "sub": "svlada@gmail.com", "scopes": [ "ROLE_REFRESH_TOKEN" ], "iss": "http://svlada.com", "jti": "90afe78c-1d2e-4869-a77e-1d754b60e0ce", "iat": 1472033308, "exp": 1472036908 }

Signature (base64 encoded)

SEEG60YRznBB2O7Gn_5X6YbRmyB3ml4hnpSOxqkwQUFtqA6MZo7_n2Am2QhTJBJA1Ygv74F2IxiLv0urxGLQjg

Let's dive into implementation details.

AjaxLoginProcessingFilter

AbstractAuthenticationProcessingFilter class is responsible for processing of HTTP-based authentication requests. Please note that AuthenticationManager must be set for this class.

AjaxLoginProcessingFilter is overriding AbstractAuthenticationProcessingFilter to provide implementation for AJAX based authentication.

Parsing and basic validation of incoming JSON payload is done in the AjaxLoginProcessingFilter#attemptAuthentication method. If authentication JSON payload is valid, actual authentication logic is delegated to AjaxAuthenticationProvider class.

In case of successuful authentication AjaxLoginProcessingFilter#successfulAuthentication is called. In case of application failure AjaxLoginProcessingFilter#unsuccessfulAuthentication is called.

public class AjaxLoginProcessingFilter extends AbstractAuthenticationProcessingFilter {
    private static Logger logger = LoggerFactory.getLogger(AjaxLoginProcessingFilter.class);

    private final AuthenticationSuccessHandler successHandler;
    private final AuthenticationFailureHandler failureHandler;

    private final ObjectMapper objectMapper;
    
    public AjaxLoginProcessingFilter(String defaultFilterProcessesUrl, 
            AuthenticationSuccessHandler successHandler, 
            AuthenticationFailureHandler failureHandler, 
            ObjectMapper mapper) {
        super(defaultFilterProcessesUrl);
        this.successHandler = successHandler;
        this.failureHandler = failureHandler;
        this.objectMapper = mapper;
    }

    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response)
            throws AuthenticationException, IOException, ServletException {
        if (!HttpMethod.POST.name().equals(request.getMethod()) || !WebUtil.isAjax(request)) {
            throw new AuthMethodNotSupportedException("Authentication method not supported");
        }

        LoginRequest loginRequest = objectMapper.readValue(request.getReader(), LoginRequest.class);
        
        if (StringUtils.isBlank(loginRequest.getUsername()) || StringUtils.isBlank(loginRequest.getPassword())) {
            throw new AuthenticationServiceException("Username or Password not provided");
        }
        
        UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(loginRequest.getUsername(), loginRequest.getPassword());

        return this.getAuthenticationManager().authenticate(token);
    }

    @Override
    protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain,
            Authentication authResult) throws IOException, ServletException {
        successHandler.onAuthenticationSuccess(request, response, authResult);
    }

    @Override
    protected void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response,
            AuthenticationException failed) throws IOException, ServletException {
        SecurityContextHolder.clearContext();
        failureHandler.onAuthenticationFailure(request, response, failed);
    }
}

AjaxAuthenticationProvider

AjaxAuthenticationProvider class responsiblity is to:

Verify user credentials against database, ldap or some other system which holds user data.
Throw authentication exception in case of that username and password doesn't match record in the database, username doesnt exists, etc.
Create UserContext and populate it with information you need.
Create JWT Token and sign it with the private key (JwtTokenFactory).

@Component
public class AjaxAuthenticationProvider implements AuthenticationProvider {
    private final JwtTokenFactory tokenFactory;
    private final UserService userService;
    
    @Autowired
    public AjaxAuthenticationProvider(final JwtTokenFactory tokenFactory, final UserService userService) {
        this.tokenFactory = tokenFactory;
        this.userService = userService;
    }

    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        Assert.notNull(authentication, "No authentication data provided.");

        String username = (String) authentication.getPrincipal();
        String password = (String) authentication.getCredentials();

        UserContext userContext = userService.loadUser(username, password);

        SafeJwtToken safeJwtToken = tokenFactory.createSafeToken(userContext, userContext.getAuthorities());

        return new JwtAuthenticationToken(userContext, safeJwtToken, userContext.getAuthorities());
    }

    @Override
    public boolean supports(Class<?> authentication) {
        return (UsernamePasswordAuthenticationToken.class.isAssignableFrom(authentication));
    }
}

Let's focus for a moment on how JWT token is created. In this tutorial we are using Java JWT library created by Stormpath.

Make sure that this JJWT dependency is included in your pom.xml.

<dependency>
	<groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>${jjwt.version}</version>
</dependency>

JwtTokenFactory#createSafeToken method will create signed Jwt Token.

Please note that if you are instantiating Claims object outside of Jwts.builder() make sure to first invoke Jwts.builder()#setClaims(claims). Why? Well, if you don't do that, Jwts.builder will, by default, create empty Claims object. What that means? Well if you call Jwts.builder()#setClaims() after you have set subject with Jwts.builder()#setSubject() your subject will be lost. Simply new instance of Claims class will overwrite default one created by Jwts.builder().

@Component
public class JwtTokenFactory {
    @Autowired
    private JwtSettings settings;

    /**
     * Factory method for issuing new JWT Tokens.
     * 
     * @param username
     * @param roles
     * @return
     */
    public SafeJwtToken createSafeToken(UserContext userContext, final Collection<GrantedAuthority> roles) {
        if (StringUtils.isBlank(userContext.getUsername())) {
            throw new IllegalArgumentException("Cannot create JWT Token without username");
        }

        if (Collections.isEmpty(roles)) {
            throw new IllegalArgumentException("Cannot create JWT Token without roles");
        }

        DateTime currentTime = new DateTime();

        Claims claims = Jwts.claims();
        claims.put("roles", AuthorityUtils.authorityListToSet(roles));

        String token = Jwts.builder()
          .setClaims(claims)
          .setIssuer(settings.getTokenIssuer())
          .setSubject(userContext.getUsername())
          .setIssuedAt(currentTime.toDate())
          .setExpiration(currentTime.plusMinutes(settings.getTokenExpirationTime()).toDate())
          .signWith(SignatureAlgorithm.HS512, settings.getTokenSigningKey())
        .compact();

        return new SafeJwtToken(token, claims);
    }

    /**
     * Unsafe version of JWT token is created.
     * 
     * <strong>WARNING:</strong> Token signature validation is not performed.
     * 
     * @param tokenPayload
     * @return unsafe version of JWT token.
     */
    public UnsafeJwtToken createUnsafeToken(String tokenPayload) {
        return new UnsafeJwtToken(tokenPayload);
    }
}

We have extended AbstractAuthenticationToken and implemented JwtAuthenticationToken that will be passed through application as an authentication object.

public class JwtAuthenticationToken extends AbstractAuthenticationToken {
    private static final long serialVersionUID = 2877954820905567501L;

    private JwtToken safeToken;
    private UnsafeJwtToken unsafeToken;

    private UserContext userContext;

    public JwtAuthenticationToken(UnsafeJwtToken unsafeToken) {
        super(null);
        this.unsafeToken = unsafeToken;
        this.setAuthenticated(false);
    }

    public JwtAuthenticationToken(UserContext userContext, SafeJwtToken token,
            Collection<? extends GrantedAuthority> authorities) {
        super(authorities);
        this.safeToken = token;
        this.userContext = userContext;
        super.setAuthenticated(true);
    }

    @Override
    public void setAuthenticated(boolean authenticated) {
        if (authenticated) {
            throw new IllegalArgumentException(
                    "Cannot set this token to trusted - use constructor which takes a GrantedAuthority list instead");
        }
        super.setAuthenticated(false);
    }

    @Override
    public Object getCredentials() {
        return null;
    }

    @Override
    public Object getPrincipal() {
        return this.userContext;
    }

    public JwtToken getSafeToken() {
        return this.safeToken;
    }

    public UnsafeJwtToken getUnsafeToken() {
        return unsafeToken;
    }

    @Override
    public void eraseCredentials() {
        super.eraseCredentials();
    }
}

AjaxAwareAuthenticationSuccessHandler

AjaxAwareAuthenticationSuccessHandler is simple class and it's used by Spring to actually send HTTP response upon successuful authentication.

@Component
public class AjaxAwareAuthenticationSuccessHandler implements AuthenticationSuccessHandler {
    private final ObjectMapper mapper;

    @Autowired
    public AjaxAwareAuthenticationSuccessHandler(ObjectMapper mapper) {
        this.mapper = mapper;
    }

    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
            Authentication authentication) throws IOException, ServletException {
        JwtToken token = ((JwtAuthenticationToken) authentication).getSafeToken();

        response.setStatus(HttpStatus.OK.value());
        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
        mapper.writeValue(response.getWriter(), token);

        clearAuthenticationAttributes(request);
    }

    /**
     * Removes temporary authentication-related data which may have been stored
     * in the session during the authentication process..
     * 
     */
    protected final void clearAuthenticationAttributes(HttpServletRequest request) {
        HttpSession session = request.getSession(false);

        if (session == null) {
            return;
        }

        session.removeAttribute(WebAttributes.AUTHENTICATION_EXCEPTION);
    }
}

AjaxAwareAuthenticationFailureHandler

AjaxAwareAuthenticationFailureHandler is invoked by Spring in case of authentication failure. You can create specific error message based on exception type that have occured during the authentication process.

@Component
public class AjaxAwareAuthenticationFailureHandler implements AuthenticationFailureHandler {
    private final ObjectMapper mapper;
    
    @Autowired
    public AjaxAwareAuthenticationFailureHandler(ObjectMapper mapper) {
        this.mapper = mapper;
    }	
    
	@Override
	public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response,
			AuthenticationException e) throws IOException, ServletException {
		
		response.setStatus(HttpStatus.UNAUTHORIZED.value());
		response.setContentType(MediaType.APPLICATION_JSON_VALUE);
		
		if (e instanceof BadCredentialsException) {
			mapper.writeValue(response.getWriter(), ErrorResponse.of("Invalid username or password", ErrorCode.AUTHENTICATION, HttpStatus.UNAUTHORIZED));
		} else if (e instanceof JwtExpiredTokenException) {
			mapper.writeValue(response.getWriter(), ErrorResponse.of("Token has expired", ErrorCode.JWT_TOKEN_EXPIRED, HttpStatus.UNAUTHORIZED));
		} else if (e instanceof AuthMethodNotSupportedException) {
		    mapper.writeValue(response.getWriter(), ErrorResponse.of(e.getMessage(), ErrorCode.AUTHENTICATION, HttpStatus.UNAUTHORIZED));
		}

		mapper.writeValue(response.getWriter(), ErrorResponse.of("Authentication failed", ErrorCode.AUTHENTICATION, HttpStatus.UNAUTHORIZED));
	}
}

This is first version of WebSecurityConfig. We will add more configuration to it once we start with showcase of JWT Authentication flow.

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    public static final String FORM_BASED_LOGIN_ENTRY_POINT = "/api/auth/login";
    public static final String TOKEN_BASED_AUTH_ENTRY_POINT = "/api/**";

    @Autowired private RestAuthenticationEntryPoint authenticationEntryPoint;
    @Autowired private AuthenticationSuccessHandler successHandler;
    @Autowired private AuthenticationFailureHandler failureHandler;
    @Autowired private AjaxAuthenticationProvider ajaxAuthenticationProvider;

    @Autowired private AuthenticationManager authenticationManager;
    
    @Autowired private ObjectMapper objectMapper;
    
    @Bean
    protected AjaxLoginProcessingFilter buildAjaxLoginProcessingFilter() throws Exception {
        AjaxLoginProcessingFilter filter = new AjaxLoginProcessingFilter(FORM_BASED_LOGIN_ENTRY_POINT, successHandler, failureHandler, objectMapper);
        filter.setAuthenticationManager(this.authenticationManager);
        return filter;
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
    
    protected void configure(AuthenticationManagerBuilder auth) {
        auth.authenticationProvider(ajaxAuthenticationProvider);
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
        .csrf().disable() // We don't need CSRF for JWT based authentication
        .exceptionHandling()
        .authenticationEntryPoint(this.authenticationEntryPoint)
        
        .and()
            .sessionManagement()
            .sessionCreationPolicy(SessionCreationPolicy.STATELESS)

        .and()
            .authorizeRequests()
            .antMatchers(FORM_BASED_LOGIN_ENTRY_POINT).permitAll() // Login end-point
        .and()
            .addFilterBefore(buildAjaxLoginProcessingFilter(), UsernamePasswordAuthenticationFilter.class);
    }
}