Gluu Server in Java: Open Source Identity and Access Management

Gluu is an open-source identity and access management (IAM) platform that provides single sign-on (SSO), multi-factor authentication (MFA), and API security. While Gluu Server itself is written in Python, it provides comprehensive Java client support for integration.

Gluu Server Overview

Gluu provides:

OAuth 2.0 and OpenID Connect authorization server
SAML 2.0 identity provider
Multi-factor authentication (2FA, FIDO2, etc.)
User management and directory services
API security and access management

Java Client Dependencies

Maven Configuration:

<dependencies> <!-- Gluu OXAuth Client --> <dependency> <groupId>org.gluu</groupId> <artifactId>oxauth-client</artifactId> <version>4.4.0</version> </dependency> <!-- Gluu Configuration API --> <dependency> <groupId>org.gluu</groupId> <artifactId>oxcore-api</artifactId> <version>4.4.0</version> </dependency> <!-- OpenID Connect --> <dependency> <groupId>com.nimbusds</groupId> <artifactId>oauth2-oidc-sdk</artifactId> <version>10.7.1</version> </dependency> <!-- SAML --> <dependency> <groupId>org.opensaml</groupId> <artifactId>opensaml-core</artifactId> <version>4.1.1</version> </dependency> <!-- Spring Security Integration --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-oauth2-client</artifactId> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-oauth2-jose</artifactId> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-saml2-service-provider</artifactId> </dependency> </dependencies>

Gluu Configuration Properties

GluuProperties.java:

@Configuration @ConfigurationProperties(prefix = "gluu") @Data public class GluuProperties { // Server configuration private String baseUrl = "https://gluu.example.com"; private String domain = "example.com"; // OpenID Connect configuration private OidcConfig oidc = new OidcConfig(); // SAML configuration private SamlConfig saml = new SamlConfig(); // Client configuration private ClientConfig client = new ClientConfig(); // LDAP configuration (if using Gluu LDAP) private LdapConfig ldap = new LdapConfig(); @Data public static class OidcConfig { private String issuer = "${gluu.baseUrl}"; private String authorizationEndpoint = "${gluu.baseUrl}/oxauth/restv1/authorize"; private String tokenEndpoint = "${gluu.baseUrl}/oxauth/restv1/token"; private String userInfoEndpoint = "${gluu.baseUrl}/oxauth/restv1/userinfo"; private String jwksUri = "${gluu.baseUrl}/oxauth/restv1/jwks"; private String endSessionEndpoint = "${gluu.baseUrl}/oxauth/restv1/end_session"; private List<String> scopes = Arrays.asList("openid", "profile", "email", "groups"); } @Data public static class SamlConfig { private String idpMetadataUrl = "${gluu.baseUrl}/idp/shibboleth"; private String entityId = "${gluu.baseUrl}/saml/metadata"; private String assertionConsumerServiceUrl; private String singleLogoutServiceUrl; } @Data public static class ClientConfig { private String clientId; private String clientSecret; private String redirectUri; private List<String> postLogoutRedirectUris = new ArrayList<>(); private List<String> grantTypes = Arrays.asList("authorization_code", "refresh_token"); private List<String> responseTypes = Arrays.asList("code"); } @Data public static class LdapConfig { private String server = "localhost"; private int port = 1636; private boolean ssl = true; private String bindDn; private String bindPassword; private String usersBaseDn = "ou=people,o=gluu"; private String groupsBaseDn = "ou=groups,o=gluu"; } }

Gluu OpenID Connect Client

GluuOidcClient.java:

@Service @Slf4j public class GluuOidcClient { private final GluuProperties gluuProperties; private final ObjectMapper objectMapper; private final RestTemplate restTemplate; private OIDCProviderMetadata providerMetadata; private ClientAuthentication clientAuthentication; public GluuOidcClient(GluuProperties gluuProperties) { this.gluuProperties = gluuProperties; this.objectMapper = new ObjectMapper(); this.restTemplate = new RestTemplate(); initializeProviderMetadata(); } private void initializeProviderMetadata() { try { // Discover OIDC provider metadata URI issuerUri = new URI(gluuProperties.getOidc().getIssuer()); providerMetadata = OIDCProviderMetadata.resolve(issuerUri); // Set up client authentication clientAuthentication = new ClientSecretPost( new ClientID(gluuProperties.getClient().getClientId()), new Secret(gluuProperties.getClient().getClientSecret()) ); log.info("Initialized Gluu OIDC client for issuer: {}", issuerUri); } catch (Exception e) { throw new GluuConfigurationException("Failed to initialize OIDC client", e); } } public String generateAuthorizationUrl(String state, String nonce, String redirectUri) { try { AuthenticationRequest request = new AuthenticationRequest.Builder( new ResponseType("code"), new Scope("openid", "profile", "email"), new ClientID(gluuProperties.getClient().getClientId()), new URI(redirectUri != null ? redirectUri : gluuProperties.getClient().getRedirectUri()) ) .endpointURI(providerMetadata.getAuthorizationEndpointURI()) .state(new State(state)) .nonce(new Nonce(nonce)) .build(); return request.toURI().toString(); } catch (Exception e) { throw new GluuAuthException("Failed to generate authorization URL", e); } } public TokenResponse exchangeCodeForToken(String authorizationCode, String redirectUri) { try { TokenRequest request = new TokenRequest( providerMetadata.getTokenEndpointURI(), clientAuthentication, new AuthorizationCodeGrant( new AuthorizationCode(authorizationCode), new URI(redirectUri) ) ); return TokenResponse.parse(request.toHTTPRequest().send()); } catch (Exception e) { throw new GluuAuthException("Failed to exchange code for token", e); } } public UserInfo getUserInfo(String accessToken) { try { UserInfoRequest request = new UserInfoRequest( providerMetadata.getUserinfoEndpointURI(), new BearerAccessToken(accessToken) ); UserInfoResponse response = UserInfoResponse.parse(request.toHTTPRequest().send()); if (!response.indicatesSuccess()) { throw new GluuAuthException("UserInfo request failed: " + response.getErrorObject()); } return response.toUserInfo(); } catch (Exception e) { throw new GluuAuthException("Failed to get user info", e); } } public boolean validateIdToken(String idToken, String nonce) { try { JWT jwt = JWTParser.parse(idToken); // Create validator IDTokenValidator validator = new IDTokenValidator( providerMetadata.getIssuer(), new ClientID(gluuProperties.getClient().getClientId()), JWSAlgorithm.RS256, providerMetadata.getJWKSetURI().toURL() ); // Validate token IDTokenClaimsSet claims = validator.validate(jwt, new Nonce(nonce)); log.debug("Validated ID token for subject: {}", claims.getSubject()); return true; } catch (Exception e) { log.error("ID token validation failed", e); return false; } } public void endSession(String idToken, String postLogoutRedirectUri) { try { EndSessionRequest request = new EndSessionRequest( providerMetadata.getEndSessionEndpointURI(), new LogoutToken(idToken), postLogoutRedirectUri != null ? new URI(postLogoutRedirectUri) : null, null ); // Send end session request request.toHTTPRequest().send(); } catch (Exception e) { log.warn("End session request failed", e); } } public Map<String, Object> getUserProfile(String accessToken) { try { UserInfo userInfo = getUserInfo(accessToken); return userInfo.toJWTClaimsSet().getClaims(); } catch (Exception e) { throw new GluuAuthException("Failed to get user profile", e); } } }

Spring Security OIDC Configuration

GluuOidcSecurityConfig.java:

@Configuration @EnableWebSecurity @EnableGlobalMethodSecurity(prePostEnabled = true) public class GluuOidcSecurityConfig { private final GluuProperties gluuProperties; private final GluuUserService gluuUserService; public GluuOidcSecurityConfig(GluuProperties gluuProperties, GluuUserService gluuUserService) { this.gluuProperties = gluuProperties; this.gluuUserService = gluuUserService; } @Bean public SecurityFilterChain filterChain(HttpSecurity http) throws Exception { http .authorizeHttpRequests(authz -> authz .requestMatchers("/", "/login", "/oauth2/**", "/public/**").permitAll() .anyRequest().authenticated() ) .oauth2Login(oauth2 -> oauth2 .loginPage("/login") .defaultSuccessUrl("/dashboard") .failureUrl("/login?error=true") .userInfoEndpoint(userInfo -> userInfo .userService(gluuUserService) ) ) .logout(logout -> logout .logoutSuccessUrl("/login?logout=true") .invalidateHttpSession(true) .deleteCookies("JSESSIONID") ) .exceptionHandling(exceptions -> exceptions .authenticationEntryPoint(new LoginUrlAuthenticationEntryPoint("/login")) ); return http.build(); } @Bean public ClientRegistrationRepository clientRegistrationRepository() { return new InMemoryClientRegistrationRepository(gluuClientRegistration()); } @Bean public OAuth2AuthorizedClientService authorizedClientService() { return new InMemoryOAuth2AuthorizedClientService(clientRegistrationRepository()); } private ClientRegistration gluuClientRegistration() { return ClientRegistration.withRegistrationId("gluu") .clientId(gluuProperties.getClient().getClientId()) .clientSecret(gluuProperties.getClient().getClientSecret()) .scope(gluuProperties.getOidc().getScopes().toArray(new String[0])) .authorizationUri(gluuProperties.getOidc().getAuthorizationEndpoint()) .tokenUri(gluuProperties.getOidc().getTokenEndpoint()) .userInfoUri(gluuProperties.getOidc().getUserInfoEndpoint()) .jwkSetUri(gluuProperties.getOidc().getJwksUri()) .userNameAttributeName("sub") .clientName("Gluu Server") .redirectUri(gluuProperties.getClient().getRedirectUri()) .authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE) .build(); } }

Gluu User Service

GluuUserService.java:

@Service @Slf4j public class GluuUserService implements OAuth2UserService<OAuth2UserRequest, OAuth2User> { private final UserRepository userRepository; private final RoleService roleService; public GluuUserService(UserRepository userRepository, RoleService roleService) { this.userRepository = userRepository; this.roleService = roleService; } @Override public OAuth2User loadUser(OAuth2UserRequest userRequest) throws OAuth2AuthenticationException { try { // Get user attributes from OIDC provider OAuth2User oauth2User = DefaultOAuth2UserService.loadUser(userRequest); Map<String, Object> attributes = oauth2User.getAttributes(); // Extract user information String subject = (String) attributes.get("sub"); String email = (String) attributes.get("email"); String name = (String) attributes.get("name"); log.info("Loading user from Gluu: {} ({})", email, subject); // Find or create user in local database UserEntity userEntity = userRepository.findBySub(subject) .orElseGet(() -> createUserFromOidc(attributes)); // Update user information updateUserFromOidc(userEntity, attributes); // Convert to Spring Security user return convertToOAuth2User(userEntity, attributes); } catch (Exception e) { throw new OAuth2AuthenticationException("Failed to load user from Gluu", e); } } private UserEntity createUserFromOidc(Map<String, Object> attributes) { UserEntity user = new UserEntity(); user.setSub((String) attributes.get("sub")); user.setEmail((String) attributes.get("email")); user.setGivenName((String) attributes.get("given_name")); user.setFamilyName((String) attributes.get("family_name")); user.setFullName((String) attributes.get("name")); user.setEnabled(true); user.setCreatedAt(Instant.now()); // Assign default role Role defaultRole = roleService.getDefaultRole(); user.setRoles(Set.of(defaultRole)); return userRepository.save(user); } private void updateUserFromOidc(UserEntity user, Map<String, Object> attributes) { user.setEmail((String) attributes.get("email")); user.setGivenName((String) attributes.get("given_name")); user.setFamilyName((String) attributes.get("family_name")); user.setFullName((String) attributes.get("name")); user.setLastLogin(Instant.now()); userRepository.save(user); } private OAuth2User convertToOAuth2User(UserEntity user, Map<String, Object> attributes) { Set<GrantedAuthority> authorities = user.getRoles().stream() .flatMap(role -> role.getPermissions().stream()) .map(permission -> new SimpleGrantedAuthority(permission.name())) .collect(Collectors.toSet()); // Add role authorities user.getRoles().forEach(role -> authorities.add(new SimpleGrantedAuthority("ROLE_" + role.getName()))); return new DefaultOAuth2User(authorities, attributes, "sub"); } }

Gluu LDAP Integration

GluuLdapService.java:

@Service @Slf4j public class GluuLdapService { private final GluuProperties gluuProperties; private final LdapTemplate ldapTemplate; public GluuLdapService(GluuProperties gluuProperties) { this.gluuProperties = gluuProperties; this.ldapTemplate = createLdapTemplate(); } private LdapTemplate createLdapTemplate() { LdapContextSource contextSource = new LdapContextSource(); contextSource.setUrl(String.format("ldaps://%s:%d", gluuProperties.getLdap().getServer(), gluuProperties.getLdap().getPort())); contextSource.setUserDn(gluuProperties.getLdap().getBindDn()); contextSource.setPassword(gluuProperties.getLdap().getBindPassword()); contextSource.afterPropertiesSet(); return new LdapTemplate(contextSource); } public List<GluuUser> findUsers(String searchFilter) { try { AndFilter filter = new AndFilter(); filter.and(new EqualsFilter("objectClass", "gluuPerson")); if (searchFilter != null) { filter.and(new WhitespaceWildcardsFilter("cn", searchFilter)); } return ldapTemplate.search( gluuProperties.getLdap().getUsersBaseDn(), filter.encode(), new GluuUserAttributesMapper() ); } catch (Exception e) { throw new GluuLdapException("Failed to search users", e); } } public GluuUser findUserByUid(String uid) { try { AndFilter filter = new AndFilter(); filter.and(new EqualsFilter("objectClass", "gluuPerson")); filter.and(new EqualsFilter("uid", uid)); List<GluuUser> users = ldapTemplate.search( gluuProperties.getLdap().getUsersBaseDn(), filter.encode(), new GluuUserAttributesMapper() ); return users.isEmpty() ? null : users.get(0); } catch (Exception e) { throw new GluuLdapException("Failed to find user by uid: " + uid, e); } } public GluuUser findUserByEmail(String email) { try { AndFilter filter = new AndFilter(); filter.and(new EqualsFilter("objectClass", "gluuPerson")); filter.and(new EqualsFilter("mail", email)); List<GluuUser> users = ldapTemplate.search( gluuProperties.getLdap().getUsersBaseDn(), filter.encode(), new GluuUserAttributesMapper() ); return users.isEmpty() ? null : users.get(0); } catch (Exception e) { throw new GluuLdapException("Failed to find user by email: " + email, e); } } public List<GluuGroup> findUserGroups(String userId) { try { AndFilter filter = new AndFilter(); filter.and(new EqualsFilter("objectClass", "gluuGroup")); filter.and(new EqualsFilter("member", "inum=" + userId + "," + gluuProperties.getLdap().getUsersBaseDn())); return ldapTemplate.search( gluuProperties.getLdap().getGroupsBaseDn(), filter.encode(), new GluuGroupAttributesMapper() ); } catch (Exception e) { throw new GluuLdapException("Failed to find user groups", e); } } public void updateUserAttribute(String userId, String attributeName, String attributeValue) { try { ModificationItem[] modifications = new ModificationItem[] { new ModificationItem(DirContext.REPLACE_ATTRIBUTE, new BasicAttribute(attributeName, attributeValue)) }; String userDn = String.format("inum=%s,%s", userId, gluuProperties.getLdap().getUsersBaseDn()); ldapTemplate.modifyAttributes(userDn, modifications); log.info("Updated attribute {} for user: {}", attributeName, userId); } catch (Exception e) { throw new GluuLdapException("Failed to update user attribute", e); } } private static class GluuUserAttributesMapper implements AttributesMapper<GluuUser> { @Override public GluuUser mapFromAttributes(Attributes attributes) throws NamingException { GluuUser user = new GluuUser(); user.setInum((String) attributes.get("inum").get()); user.setUid((String) attributes.get("uid").get()); user.setEmail((String) attributes.get("mail").get()); user.setGivenName((String) attributes.get("givenName").get()); user.setFamilyName((String) attributes.get("sn").get()); user.setDisplayName((String) attributes.get("displayName").get()); user.setStatus((String) attributes.get("status").get()); return user; } } private static class GluuGroupAttributesMapper implements AttributesMapper<GluuGroup> { @Override public GluuGroup mapFromAttributes(Attributes attributes) throws NamingException { GluuGroup group = new GluuGroup(); group.setInum((String) attributes.get("inum").get()); group.setDisplayName((String) attributes.get("displayName").get()); group.setDescription((String) attributes.get("description").get()); return group; } } @Data public static class GluuUser { private String inum; private String uid; private String email; private String givenName; private String familyName; private String displayName; private String status; } @Data public static class GluuGroup { private String inum; private String displayName; private String description; } }

SAML 2.0 Integration

GluuSamlService.java:

@Service @Slf4j public class GluuSamlService { private final GluuProperties gluuProperties; private final SAML2AuthenticationTokenResolver authenticationTokenResolver; public GluuSamlService(GluuProperties gluuProperties) { this.gluuProperties = gluuProperties; this.authenticationTokenResolver = createAuthenticationTokenResolver(); } private SAML2AuthenticationTokenResolver createAuthenticationTokenResolver() { try { RelyingPartyRegistration registration = RelyingPartyRegistrations .fromMetadataLocation(gluuProperties.getSaml().getIdpMetadataUrl()) .registrationId("gluu-saml") .entityId(gluuProperties.getSaml().getEntityId()) .assertionConsumerServiceLocation(gluuProperties.getSaml().getAssertionConsumerServiceUrl()) .build(); OpenSaml4AuthenticationProvider authenticationProvider = new OpenSaml4AuthenticationProvider(); authenticationProvider.setResponseAuthenticationConverter( new GluuSamlResponseConverter() ); return new OpenSaml4AuthenticationTokenResolver(authenticationProvider); } catch (Exception e) { throw new GluuSamlException("Failed to initialize SAML service", e); } } public String generateAuthnRequest() { try { // In a real implementation, you would use Spring Security SAML // or a library like OpenSAML to generate the AuthnRequest String authnRequest = createSamlAuthnRequest(); log.debug("Generated SAML AuthnRequest"); return authnRequest; } catch (Exception e) { throw new GluuSamlException("Failed to generate AuthnRequest", e); } } public SAML2AuthenticationToken resolveAuthenticationToken(HttpServletRequest request) { return authenticationTokenResolver.resolve(request); } public void processSamlResponse(SAML2AuthenticationToken authenticationToken) { try { SAML2AuthenticationToken authenticated = authenticationTokenResolver.authenticate( authenticationToken ); log.info("SAML authentication successful for: {}", authenticated.getName()); } catch (Exception e) { throw new GluuSamlException("Failed to process SAML response", e); } } private String createSamlAuthnRequest() { // This would typically use OpenSAML to create a proper AuthnRequest // Simplified for example purposes return Base64.getEncoder().encodeToString( "<samlp:AuthnRequest>...</samlp:AuthnRequest>".getBytes() ); } private static class GluuSamlResponseConverter implements Converter<OpenSaml4AuthenticationProvider.ResponseToken, SAML2Authentication> { @Override public SAML2Authentication convert(OpenSaml4AuthenticationProvider.ResponseToken responseToken) { var authentication = OpenSaml4AuthenticationProvider .createDefaultResponseAuthenticationConverter() .convert(responseToken); // Extract custom attributes from Gluu Map<String, List<Object>> attributes = extractGluuAttributes( responseToken.getResponse() ); return new SAML2Authentication( authentication.getPrincipal(), authentication.getCredentials(), authentication.getAuthorities(), attributes ); } private Map<String, List<Object>> extractGluuAttributes(Response response) { Map<String, List<Object>> attributes = new HashMap<>(); // Extract attributes from SAML response // This would typically parse the Assertion and extract attributes return attributes; } } }

Gluu REST API Client

GluuApiClient.java:

@Service @Slf4j public class GluuApiClient { private final GluuProperties gluuProperties; private final RestTemplate restTemplate; public GluuApiClient(GluuProperties gluuProperties) { this.gluuProperties = gluuProperties; this.restTemplate = createRestTemplate(); } private RestTemplate createRestTemplate() { RestTemplate template = new RestTemplate(); // Add authentication interceptor template.getInterceptors().add((request, body, execution) -> { request.getHeaders().setBasicAuth( gluuProperties.getClient().getClientId(), gluuProperties.getClient().getClientSecret() ); return execution.execute(request, body); }); return template; } public Map<String, Object> getServerConfiguration() { try { String url = gluuProperties.getBaseUrl() + "/oxauth/restv1/configuration"; ResponseEntity<Map> response = restTemplate.getForEntity(url, Map.class); return response.getBody(); } catch (Exception e) { throw new GluuApiException("Failed to get server configuration", e); } } public Map<String, Object> registerClient(ClientRegistrationRequest request) { try { String url = gluuProperties.getBaseUrl() + "/oxauth/restv1/register"; ResponseEntity<Map> response = restTemplate.postForEntity(url, request, Map.class); return response.getBody(); } catch (Exception e) { throw new GluuApiException("Failed to register client", e); } } public Map<String, Object> introspectToken(String token) { try { String url = gluuProperties.getBaseUrl() + "/oxauth/restv1/introspection"; MultiValueMap<String, String> formData = new LinkedMultiValueMap<>(); formData.add("token", token); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED); HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(formData, headers); ResponseEntity<Map> response = restTemplate.postForEntity(url, request, Map.class); return response.getBody(); } catch (Exception e) { throw new GluuApiException("Failed to introspect token", e); } } public boolean isTokenActive(String token) { try { Map<String, Object> introspection = introspectToken(token); return Boolean.TRUE.equals(introspection.get("active")); } catch (Exception e) { log.warn("Token introspection failed", e); return false; } } @Data public static class ClientRegistrationRequest { private String clientName; private List<String> redirectUris; private List<String> grantTypes; private List<String> responseTypes; private List<String> contacts; private String logoUri; private String clientUri; private String policyUri; private String tosUri; } }

Multi-Factor Authentication (MFA) Integration

GluuMfaService.java:

@Service @Slf4j public class GluuMfaService { private final GluuOidcClient oidcClient; private final GluuApiClient apiClient; public GluuMfaService(GluuOidcClient oidcClient, GluuApiClient apiClient) { this.oidcClient = oidcClient; this.apiClient = apiClient; } public boolean isMfaRequired(String userId) { // Check if user has MFA enabled in Gluu // This would typically check user attributes or policies return false; // Implementation specific } public MfaChallenge initiateMfaChallenge(String userId, MfaMethod method) { try { // Initiate MFA challenge based on method switch (method) { case TOTP: return initiateTotpChallenge(userId); case FIDO2: return initiateFido2Challenge(userId); case SMS: return initiateSmsChallenge(userId); case EMAIL: return initiateEmailChallenge(userId); default: throw new UnsupportedMfaMethodException("Unsupported MFA method: " + method); } } catch (Exception e) { throw new MfaException("Failed to initiate MFA challenge", e); } } public boolean verifyMfaChallenge(String userId, String challengeId, String code) { try { // Verify MFA challenge response // This would typically call Gluu's MFA verification endpoint return true; // Implementation specific } catch (Exception e) { throw new MfaException("Failed to verify MFA challenge", e); } } private MfaChallenge initiateTotpChallenge(String userId) { // For TOTP, the user typically already has the authenticator app return MfaChallenge.builder() .challengeId(UUID.randomUUID().toString()) .method(MfaMethod.TOTP) .message("Enter code from your authenticator app") .expiresAt(Instant.now().plusSeconds(300)) .build(); } private MfaChallenge initiateSmsChallenge(String userId) { // Initiate SMS OTP challenge String code = generateOtpCode(); // Send SMS with code (integration with SMS gateway) sendSms(userId, code); return MfaChallenge.builder() .challengeId(UUID.randomUUID().toString()) .method(MfaMethod.SMS) .message("Enter the code sent to your mobile device") .expiresAt(Instant.now().plusSeconds(300)) .build(); } private MfaChallenge initiateFido2Challenge(String userId) { // Initiate FIDO2 WebAuthn challenge return MfaChallenge.builder() .challengeId(UUID.randomUUID().toString()) .method(MfaMethod.FIDO2) .message("Use your security key to authenticate") .expiresAt(Instant.now().plusSeconds(300)) .build(); } private String generateOtpCode() { Random random = new Random(); return String.format("%06d", random.nextInt(999999)); } private void sendSms(String userId, String code) { // Integration with SMS gateway log.info("Sending SMS OTP {} to user {}", code, userId); } @Data @Builder public static class MfaChallenge { private String challengeId; private MfaMethod method; private String message; private Instant expiresAt; } public enum MfaMethod { TOTP, SMS, EMAIL, FIDO2, DUO } }

Application Configuration

application.yml:

gluu: base-url: https://gluu.example.com domain: example.com oidc: issuer: ${gluu.base-url} scopes: - openid - profile - email - groups client: client-id: ${GLUU_CLIENT_ID:} client-secret: ${GLUU_CLIENT_SECRET:} redirect-uri: "${gluu.base-url}/login/oauth2/code/gluu" grant-types: - authorization_code - refresh_token ldap: server: localhost port: 1636 ssl: true bind-dn: ${GLUU_LDAP_BIND_DN:} bind-password: ${GLUU_LDAP_BIND_PASSWORD:} users-base-dn: ou=people,o=gluu groups-base-dn: ou=groups,o=gluu spring: security: oauth2: client: registration: gluu: client-id: ${gluu.client.client-id} client-secret: ${gluu.client.client-secret} scope: ${gluu.oidc.scopes} redirect-uri: ${gluu.client.redirect-uri} authorization-grant-type: authorization_code provider: gluu: authorization-uri: ${gluu.base-url}/oxauth/restv1/authorize token-uri: ${gluu.base-url}/oxauth/restv1/token user-info-uri: ${gluu.base-url}/oxauth/restv1/userinfo jwk-set-uri: ${gluu.base-url}/oxauth/restv1/jwks user-name-attribute: sub

Best Practices for Gluu Integration

Secure client credentials - use environment variables or secure vault
Implement proper error handling for authentication failures
Use HTTPS for all communications with Gluu server
Validate tokens on each authenticated request
Implement session management with proper timeout handling
Monitor authentication events for security auditing
Regularly update Gluu client libraries for security patches

Conclusion

Gluu Server provides a comprehensive IAM solution that integrates seamlessly with Java applications through:

OpenID Connect for modern web authentication
SAML 2.0 for enterprise SSO integration
Multi-factor authentication for enhanced security
LDAP integration for user management
REST APIs for programmatic access

By implementing the Java clients and integration patterns shown above, organizations can leverage Gluu's powerful identity management capabilities while maintaining the flexibility and scalability of their Java applications.

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