Github SSO / OAuth2 support

build.gradle

@@ -132,6 +132,9 @@ dependencies {
 
     //AWS MSK IAM Auth
     implementation group: 'software.amazon.msk', name: 'aws-msk-iam-auth', version: '1.1.5'
+
+    // https://mvnrepository.com/artifact/io.projectreactor/reactor-core
+    implementation group: 'io.projectreactor', name: 'reactor-core', version: '3.5.1'
 }
 
 /**********************************************************************************************************************\

client/src/containers/Login/Login.jsx

@@ -19,7 +19,8 @@ class Login extends Form {
     errors: {},
     config: {
       formEnabled: true,
-      oidcAuths: []
+      oidcAuths: [],
+      oauthAuths: []
     }
   };
 
@@ -157,7 +158,7 @@ class Login extends Form {
   }
 
   render() {
-    const { formEnabled, oidcAuths } = this.state.config;
+    const { formEnabled, oidcAuths, oauthAuths } = this.state.config;
 
     return (
       <div>
@@ -177,6 +178,7 @@ class Login extends Form {
             {formEnabled && this._renderForm()}
             {formEnabled && oidcAuths && this._renderSeparator()}
             {oidcAuths && this._renderOidc(oidcAuths)}
+            {oauthAuths && this._renderOidc(oauthAuths)}
           </form>
         </main>
       </div>

docs/.vuepress/config.js

@@ -54,6 +54,7 @@ module.exports = {
               '/docs/configuration/authentifications/basic-auth.md',
               '/docs/configuration/authentifications/aws-iam-auth.md',
               '/docs/configuration/authentifications/oidc.md',
+              '/docs/configuration/authentifications/github.md',
               '/docs/configuration/authentifications/ldap.md',
               '/docs/configuration/authentifications/header.md',
               '/docs/configuration/authentifications/external.md',

docs/docs/configuration/authentifications/github.md

@@ -0,0 +1,48 @@
+
+# GitHub SSO / OAuth2
+To enable GitHub SSO in the application, you'll first have to enable OAuth2 in micronaut:
+
+```yaml
+micronaut:
+  security:
+    enabled: true
+    oauth2:
+      enabled: true
+      clients:
+        github:
+          client-id: "<client-id>"
+          client-secret: "<client-secret>"
+          scopes:
+            - user:email
+            - read:user
+          authorization:
+            url: https://github.com/login/oauth/authorize
+          token:
+            url: https://github.com/login/oauth/access_token
+            auth-method: client-secret-post
+```
+
+To further tell AKHQ to display GitHub SSO options on the login page and customize claim mapping, configure Oauth in the AKHQ config:
+
+```yaml
+akhq:
+  security:
+    default-group: no-roles
+    oauth2:
+      enabled: true
+      providers:
+        github:
+          label: "Login with GitHub"
+          username-field: login
+          users:
+            - username: franz
+              groups:
+                # the corresponding akhq groups (eg. topic-reader/writer or akhq default groups like admin/reader/no-role)
+                - topic-reader
+                - topic-writer
+```
+
+The username field can be any string field, the roles field has to be a JSON array.
+
+## References
+https://micronaut-projects.github.io/micronaut-security/latest/guide/#oauth2-configuration

src/main/java/org/akhq/configs/Oauth.java

@@ -0,0 +1,30 @@
+package org.akhq.configs;
+
+import io.micronaut.context.annotation.ConfigurationProperties;
+import lombok.Data;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+@ConfigurationProperties("akhq.security.oauth2")
+@Data
+public class Oauth {
+    private boolean enabled;
+    private Map<String, Provider> providers;
+
+    @Data
+    public static class Provider {
+        private String label = "Login with OAuth";
+        private String usernameField = "login";
+        private String groupsField = "organizations_url";
+        private String defaultGroup;
+        private List<GroupMapping> groups = new ArrayList<>();
+        private List<UserMapping> users = new ArrayList<>();
+    }
+
+    public Provider getProvider(String key) {
+        providers.putIfAbsent(key, new Provider());
+        return providers.get(key);
+    }
+}

src/main/java/org/akhq/controllers/AkhqController.java

@@ -39,6 +39,9 @@ public class AkhqController extends AbstractController {
     @Inject
     private Oidc oidc;
 
+    @Inject
+    private Oauth oauth;
+
     @Inject
     private UIOptions uIOptions;
 
@@ -80,6 +83,13 @@ public AuthDefinition auths() {
                 .collect(Collectors.toList());
         }
 
+        if (oauth.isEnabled()) {
+            authDefinition.oauthAuths = oauth.getProviders().entrySet()
+                .stream()
+                .map(e -> new OauthAuth(e.getKey(), e.getValue().getLabel()))
+                .collect(Collectors.toList());
+        }
+
         if (applicationContext.containsBean(SecurityService.class)) {
             authDefinition.loginEnabled = true;
             // Display login form if there are LocalUsers OR Ldap is enabled
@@ -180,6 +190,7 @@ public static class AuthDefinition {
         private boolean loginEnabled;
         private boolean formEnabled;
         private List<OidcAuth> oidcAuths;
+        private List<OauthAuth> oauthAuths;
         private String version;
     }
 
@@ -191,6 +202,14 @@ public static class OidcAuth {
         private String label;
     }
 
+    @AllArgsConstructor
+    @NoArgsConstructor
+    @Getter
+    public static class OauthAuth {
+        private String key;
+        private String label;
+    }
+
     @AllArgsConstructor
     @NoArgsConstructor
     @Getter

src/main/java/org/akhq/models/GithubClaims.java

@@ -0,0 +1,23 @@
+package org.akhq.models;
+
+import io.micronaut.security.token.Claims;
+
+import java.util.HashMap;
+import java.util.Set;
+
+public class GithubClaims extends HashMap<String, Object> implements Claims {
+    @Override
+    public Object get(String name) {
+        return super.get(name);
+    }
+
+    @Override
+    public Set<String> names() {
+        return super.keySet();
+    }
+
+    @Override
+    public boolean contains(String name) {
+        return super.containsKey(name);
+    }
+}

src/main/java/org/akhq/modules/GithubAuthenticationMapper.java

@@ -0,0 +1,85 @@
+package org.akhq.modules;
+
+import io.micronaut.context.annotation.Requires;
+import io.micronaut.core.annotation.Nullable;
+import io.micronaut.core.util.StringUtils;
+import io.micronaut.security.authentication.AuthenticationResponse;
+import io.micronaut.security.oauth2.endpoint.authorization.state.State;
+import io.micronaut.security.oauth2.endpoint.token.response.OauthAuthenticationMapper;
+import io.micronaut.security.oauth2.endpoint.token.response.TokenResponse;
+import jakarta.inject.Named;
+import org.akhq.configs.Oauth;
+import jakarta.inject.Inject;
+import jakarta.inject.Singleton;
+import org.akhq.models.GithubClaims;
+import org.akhq.utils.*;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+@Singleton
+@Named("github")
+@Requires(property = "akhq.security.oauth2.enabled", value = StringUtils.TRUE)
+public class GithubAuthenticationMapper implements OauthAuthenticationMapper {
+    @Inject
+    private Oauth oauth;
+    @Inject
+    private GithubApiClient apiClient;
+    @Inject
+    private ClaimProvider claimProvider;
+
+    @Override
+    public Publisher<AuthenticationResponse> createAuthenticationResponse(TokenResponse tokenResponse, @Nullable State state) {
+        return Flux.from(apiClient.getUser("token " + tokenResponse.getAccessToken()))
+            .map(user -> {
+                ClaimRequest request = ClaimRequest.builder()
+                    .providerType(ClaimProviderType.OAUTH)
+                    .providerName("github")
+                    .username(getUsername(oauth.getProvider("github"), user))
+                    .groups(getOauthGroups(oauth.getProvider("github"), user))
+                    .build();
+
+                ClaimResponse claim = claimProvider.generateClaim(request);
+
+                return AuthenticationResponse.success(getUsername(oauth.getProvider("github"), user), claim.getRoles(), claim.getAttributes());
+            });
+    }
+
+    /**
+     * Tries to read the username from the configured username field.
+     *
+     * @param provider  The OAuth provider
+     * @param user  The OAuth claims
+     * @return The username to set in the {@link io.micronaut.security.authentication.Authentication}
+     */
+    protected String getUsername(Oauth.Provider provider, GithubClaims user) {
+        String userNameField = provider.getUsernameField();
+        return Objects.toString(user.get(userNameField));
+    }
+
+    /**
+     * Tries to read groups from the configured groups field.
+     * If the configured field cannot be found or isn't some kind of collection, it will return an empty set.
+     *
+     * @param provider     The OAuth provider configuration
+     * @param user The OAuth claims
+     * @return The groups from oauth
+     */
+    protected List<String> getOauthGroups(Oauth.Provider provider, GithubClaims user) {
+        List<String> groups = new ArrayList<>();
+        if (user.contains(provider.getGroupsField())) {
+            Object groupsField = user.get(provider.getGroupsField());
+            if (groupsField instanceof Collection) {
+                groups = ((Collection<Object>) groupsField)
+                    .stream()
+                    .map(Objects::toString)
+                    .collect(Collectors.toList());
+            } else if (groupsField instanceof String) {
+                groups.add((String) groupsField);
+            }
+        }
+        return groups;
+    }
+}

src/main/java/org/akhq/utils/ClaimProviderType.java

@@ -4,5 +4,6 @@ public enum ClaimProviderType {
     HEADER,
     BASIC_AUTH,
     LDAP,
-    OIDC
+    OIDC,
+    OAUTH
 }

src/main/java/org/akhq/utils/GithubApiClient.java

@@ -0,0 +1,16 @@
+package org.akhq.utils;
+
+import io.micronaut.http.annotation.Get;
+import io.micronaut.http.annotation.Header;
+import io.micronaut.http.client.annotation.Client;
+import org.akhq.models.GithubClaims;
+import org.reactivestreams.Publisher;
+
+@Header(name = "User-Agent", value = "Micronaut")
+@Header(name = "Accept", value = "application/vnd.github.v3+json, application/json")
+@Client("https://api.github.com")
+public interface GithubApiClient {
+
+    @Get("/user")
+    Publisher<GithubClaims> getUser(@Header("Authorization") String authorization);
+}

src/main/java/org/akhq/utils/LocalSecurityClaimProvider.java

@@ -23,6 +23,8 @@ public class LocalSecurityClaimProvider implements ClaimProvider {
     Ldap ldapProperties;
     @Inject
     Oidc oidcProperties;
+    @Inject
+    Oauth oauthProperties;
 
     @Override
     public ClaimResponse generateClaim(ClaimRequest request) {
@@ -63,6 +65,16 @@ public ClaimResponse generateClaim(ClaimRequest request) {
                 defaultGroup = provider.getDefaultGroup();
                 akhqGroups.addAll(mapToAkhqGroups(request.getUsername(), request.getGroups(), groupMappings, userMappings, defaultGroup));
                 break;
+            case OAUTH:
+                // we need to convert from OAUTH login name to AKHQ groups to find the roles and attributes
+                // using akhq.security.oauth2.groups and akhq.security.oauth2.users
+                // as well as akhq.security.oauth2.default-group
+                Oauth.Provider oauthPropertiesProvider = oauthProperties.getProvider(request.getProviderName());
+                userMappings = oauthPropertiesProvider.getUsers();
+                groupMappings = oauthPropertiesProvider.getGroups();
+                defaultGroup = oauthPropertiesProvider.getDefaultGroup();
+                akhqGroups.addAll(mapToAkhqGroups(request.getUsername(), request.getGroups(), groupMappings, userMappings, defaultGroup));
+                break;
             default:
                 break;
         }