GUACAMOLE-96: Add skeleton TOTP authentication extension (hard-coded, fake TOTP).

extensions/guacamole-auth-totp/src/main/java/org/apache/guacamole/auth/totp/TOTPAuthenticationProvider.java

@@ -0,0 +1,123 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.guacamole.auth.totp;
+
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+import org.apache.guacamole.GuacamoleException;
+import org.apache.guacamole.net.auth.AuthenticatedUser;
+import org.apache.guacamole.net.auth.AuthenticationProvider;
+import org.apache.guacamole.net.auth.Credentials;
+import org.apache.guacamole.net.auth.UserContext;
+
+/**
+ * AuthenticationProvider implementation which uses TOTP as an additional
+ * authentication factor for users which have already been authenticated by
+ * some other AuthenticationProvider.
+ */
+public class TOTPAuthenticationProvider implements AuthenticationProvider {
+
+    /**
+     * Injector which will manage the object graph of this authentication
+     * provider.
+     */
+    private final Injector injector;
+
+    /**
+     * Creates a new TOTPAuthenticationProvider that verifies users using TOTP.
+     *
+     * @throws GuacamoleException
+     *     If a required property is missing, or an error occurs while parsing
+     *     a property.
+     */
+    public TOTPAuthenticationProvider() throws GuacamoleException {
+
+        // Set up Guice injector.
+        injector = Guice.createInjector(
+            new TOTPAuthenticationProviderModule(this)
+        );
+
+    }
+
+    @Override
+    public String getIdentifier() {
+        return "totp";
+    }
+
+    @Override
+    public Object getResource() {
+        return null;
+    }
+
+    @Override
+    public AuthenticatedUser authenticateUser(Credentials credentials)
+            throws GuacamoleException {
+        return null;
+    }
+
+    @Override
+    public AuthenticatedUser updateAuthenticatedUser(AuthenticatedUser authenticatedUser,
+            Credentials credentials) throws GuacamoleException {
+        return authenticatedUser;
+    }
+
+    @Override
+    public UserContext getUserContext(AuthenticatedUser authenticatedUser)
+            throws GuacamoleException {
+        return null;
+    }
+
+    @Override
+    public UserContext updateUserContext(UserContext context,
+            AuthenticatedUser authenticatedUser, Credentials credentials)
+                throws GuacamoleException {
+        return context;
+    }
+
+    @Override
+    public UserContext decorate(UserContext context,
+            AuthenticatedUser authenticatedUser, Credentials credentials)
+            throws GuacamoleException {
+
+        UserVerificationService verificationService =
+                injector.getInstance(UserVerificationService.class);
+
+        // Verify identity of user
+        verificationService.verifyIdentity(context, authenticatedUser);
+
+        // User has been verified, and authentication should be allowed to
+        // continue
+        return context;
+
+    }
+
+    @Override
+    public UserContext redecorate(UserContext decorated, UserContext context,
+            AuthenticatedUser authenticatedUser, Credentials credentials)
+            throws GuacamoleException {
+        return context;
+    }
+
+    @Override
+    public void shutdown() {
+        // Do nothing
+    }
+
+}

extensions/guacamole-auth-totp/src/main/java/org/apache/guacamole/auth/totp/TOTPAuthenticationProviderModule.java

@@ -0,0 +1,78 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.guacamole.auth.totp;
+
+import com.google.inject.AbstractModule;
+import org.apache.guacamole.GuacamoleException;
+import org.apache.guacamole.environment.Environment;
+import org.apache.guacamole.environment.LocalEnvironment;
+import org.apache.guacamole.net.auth.AuthenticationProvider;
+
+/**
+ * Guice module which configures TOTP-specific injections.
+ */
+public class TOTPAuthenticationProviderModule extends AbstractModule {
+
+    /**
+     * Guacamole server environment.
+     */
+    private final Environment environment;
+
+    /**
+     * A reference to the TOTPAuthenticationProvider on behalf of which this
+     * module has configured injection.
+     */
+    private final AuthenticationProvider authProvider;
+
+    /**
+     * Creates a new TOTP authentication provider module which configures
+     * injection for the TOTPAuthenticationProvider.
+     *
+     * @param authProvider
+     *     The AuthenticationProvider for which injection is being configured.
+     *
+     * @throws GuacamoleException
+     *     If an error occurs while retrieving the Guacamole server
+     *     environment.
+     */
+    public TOTPAuthenticationProviderModule(AuthenticationProvider authProvider)
+            throws GuacamoleException {
+
+        // Get local environment
+        this.environment = new LocalEnvironment();
+
+        // Store associated auth provider
+        this.authProvider = authProvider;
+
+    }
+
+    @Override
+    protected void configure() {
+
+        // Bind core implementations of guacamole-ext classes
+        bind(AuthenticationProvider.class).toInstance(authProvider);
+        bind(Environment.class).toInstance(environment);
+
+        // Bind TOTP-specific services
+        bind(UserVerificationService.class);
+
+    }
+
+}

extensions/guacamole-auth-totp/src/main/java/org/apache/guacamole/auth/totp/UserVerificationService.java

@@ -0,0 +1,102 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.guacamole.auth.totp;
+
+import java.util.Collections;
+import javax.servlet.http.HttpServletRequest;
+import org.apache.guacamole.GuacamoleClientException;
+import org.apache.guacamole.GuacamoleException;
+import org.apache.guacamole.form.Field;
+import org.apache.guacamole.form.TextField;
+import org.apache.guacamole.net.auth.AuthenticatedUser;
+import org.apache.guacamole.net.auth.Credentials;
+import org.apache.guacamole.net.auth.UserContext;
+import org.apache.guacamole.net.auth.credentials.CredentialsInfo;
+import org.apache.guacamole.net.auth.credentials.GuacamoleInsufficientCredentialsException;
+
+/**
+ * Service for verifying the identity of a user using TOTP.
+ */
+public class UserVerificationService {
+
+    /**
+     * The name of the HTTP parameter which will contain the TOTP code provided
+     * by the user to verify their identity.
+     */
+    private static final String TOTP_PARAMETER_NAME = "guac-totp";
+
+    /**
+     * The field which should be exposed to the user to request that they
+     * provide their TOTP code.
+     */
+    private static final Field TOTP_FIELD = new TextField(TOTP_PARAMETER_NAME);
+
+    /**
+     * CredentialsInfo object describing the credentials expected for a user
+     * who has verified their identity with TOTP.
+     */
+    private static final CredentialsInfo TOTP_CREDENTIALS = new CredentialsInfo(
+            Collections.singletonList(TOTP_FIELD)
+    );
+
+    /**
+     * Verifies the identity of the given user using TOTP. If a authentication
+     * code from the user's TOTP device has not already been provided, a code is
+     * requested in the form of additional expected credentials. Any provided
+     * code is cryptographically verified. If no code is present, or the
+     * received code is invalid, an exception is thrown.
+     *
+     * @param context
+     *     The UserContext provided for the user by another authentication
+     *     extension.
+     *
+     * @param authenticatedUser
+     *     The user whose identity should be verified using TOTP.
+     *
+     * @throws GuacamoleException
+     *     If required TOTP-specific configuration options are missing or
+     *     malformed, or if the user's identity cannot be verified.
+     */
+    public void verifyIdentity(UserContext context,
+            AuthenticatedUser authenticatedUser) throws GuacamoleException {
+
+        // Pull the original HTTP request used to authenticate
+        Credentials credentials = authenticatedUser.getCredentials();
+        HttpServletRequest request = credentials.getRequest();
+
+        // Ignore anonymous users
+        if (authenticatedUser.getIdentifier().equals(AuthenticatedUser.ANONYMOUS_IDENTIFIER))
+            return;
+
+        // Retrieve TOTP from request
+        String totp = request.getParameter(TOTP_PARAMETER_NAME);
+
+        // If no TOTP provided, request one
+        if (totp == null)
+            throw new GuacamoleInsufficientCredentialsException(
+                    "LOGIN.INFO_TOTP_REQUIRED", TOTP_CREDENTIALS);
+
+        // FIXME: Hard-coded code
+        if (!totp.equals("123456"))
+            throw new GuacamoleClientException("LOGIN.INFO_TOTP_VERIFICATION_FAILED");
+
+    }
+
+}