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docs(samples): add password leak sample and test (googleapis#808)
* docs(samples): add password leak sample and test * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md * docs(samples): added password-leak-helper dependency * Updated comment acc to review * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md * docs(samples): refactored acc to review comments. * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
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...ppets/cloud-client/src/main/java/recaptcha/passwordleak/CreatePasswordLeakAssessment.java
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| /* | ||
| * Copyright 2022 Google LLC | ||
| * | ||
| * Licensed 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 passwordleak; | ||
|
|
||
| // [START recaptcha_enterprise_password_leak_verification] | ||
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| import com.google.cloud.recaptcha.passwordcheck.PasswordCheckResult; | ||
| import com.google.cloud.recaptcha.passwordcheck.PasswordCheckVerification; | ||
| import com.google.cloud.recaptcha.passwordcheck.PasswordCheckVerifier; | ||
| import com.google.cloud.recaptchaenterprise.v1.RecaptchaEnterpriseServiceClient; | ||
| import com.google.protobuf.ByteString; | ||
| import com.google.recaptchaenterprise.v1.Assessment; | ||
| import com.google.recaptchaenterprise.v1.CreateAssessmentRequest; | ||
| import com.google.recaptchaenterprise.v1.Event; | ||
| import com.google.recaptchaenterprise.v1.PrivatePasswordLeakVerification; | ||
| import com.google.recaptchaenterprise.v1.TokenProperties; | ||
| import java.io.IOException; | ||
| import java.util.List; | ||
| import java.util.concurrent.ExecutionException; | ||
| import java.util.stream.Collectors; | ||
|
|
||
| public class CreatePasswordLeakAssessment { | ||
|
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| public static void main(String[] args) | ||
| throws IOException, ExecutionException, InterruptedException { | ||
| // TODO(developer): Replace these variables before running the sample. | ||
| // GCloud Project ID. | ||
| String projectID = "project-id"; | ||
|
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| // Site key obtained by registering a domain/app to use recaptcha Enterprise. | ||
| String recaptchaSiteKey = "recaptcha-site-key"; | ||
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| // The token obtained from the client on passing the recaptchaSiteKey. | ||
| // To get the token, integrate the recaptchaSiteKey with frontend. See, | ||
| // https://cloud.google.com/recaptcha-enterprise/docs/instrument-web-pages#frontend_integration_score | ||
| String token = "recaptcha-token"; | ||
|
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| // Action name corresponding to the token. | ||
| String recaptchaAction = "recaptcha-action"; | ||
|
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| checkPasswordLeak(projectID, recaptchaSiteKey, token, recaptchaAction); | ||
| } | ||
|
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| /* | ||
| * Detect password leaks and breached credentials to prevent account takeovers (ATOs) | ||
| * and credential stuffing attacks. | ||
| * For more information, see: https://cloud.google.com/recaptcha-enterprise/docs/getting-started | ||
| * and https://security.googleblog.com/2019/02/protect-your-accounts-from-data.html | ||
| * Steps: | ||
| * 1. Use the 'createVerification' method to hash and Encrypt the hashed username and password. | ||
| * 2. Send the hash prefix (2-byte) and the encrypted credentials to create the assessment. | ||
| * (Hash prefix is used to partition the database.) | ||
| * 3. Password leak assessment returns a database whose prefix matches the sent hash prefix. | ||
| * Create Assessment also sends back re-encrypted credentials. | ||
| * 4. The re-encrypted credential is then locally verified to see if there is a | ||
| * match in the database. | ||
| * | ||
| * To perform hashing, encryption and verification (steps 1, 2 and 4), | ||
| * reCAPTCHA Enterprise provides a helper library in Java. | ||
| * See, https://github.com/GoogleCloudPlatform/java-recaptcha-password-check-helpers | ||
| * If you want to extend this behavior to your own implementation/ languages, | ||
| * make sure to perform the following steps: | ||
| * 1. Hash the credentials (First 2 bytes of the result is the 'lookupHashPrefix') | ||
| * 2. Encrypt the hash (result = 'encryptedUserCredentialsHash') | ||
| * 3. Get back the PasswordLeak information from reCAPTCHA Enterprise Create Assessment. | ||
| * 4. Decrypt the obtained 'credentials.getReencryptedUserCredentialsHash()' | ||
| * with the same key you used for encryption. | ||
| * 5. Check if the decrypted credentials are present in 'credentials.getEncryptedLeakMatchPrefixesList()'. | ||
| * 6. If there is a match, that indicates a credential breach. | ||
| */ | ||
| public static void checkPasswordLeak( | ||
| String projectID, String recaptchaSiteKey, String token, String recaptchaAction) | ||
| throws ExecutionException, InterruptedException, IOException { | ||
| // Set the username and password to be checked. | ||
| String username = "username"; | ||
| String password = "password123"; | ||
|
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| // Instantiate the java-password-leak-helper library to perform the cryptographic functions. | ||
| PasswordCheckVerifier passwordLeak = new PasswordCheckVerifier(); | ||
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| // Create the request to obtain the hash prefix and encrypted credentials. | ||
| PasswordCheckVerification verification = | ||
| passwordLeak.createVerification(username, password).get(); | ||
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| byte[] lookupHashPrefix = verification.getLookupHashPrefix(); | ||
| byte[] encryptedUserCredentialsHash = verification.getEncryptedLookupHash(); | ||
|
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| // Pass the credentials to the createPasswordLeakAssessment() to get back | ||
| // the matching database entry for the hash prefix. | ||
| PrivatePasswordLeakVerification credentials = | ||
| createPasswordLeakAssessment( | ||
| projectID, | ||
| recaptchaSiteKey, | ||
| token, | ||
| recaptchaAction, | ||
| lookupHashPrefix, | ||
| encryptedUserCredentialsHash); | ||
|
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||
| // Convert to appropriate input format. | ||
| List<byte[]> leakMatchPrefixes = | ||
| credentials.getEncryptedLeakMatchPrefixesList().stream() | ||
| .map(ByteString::toByteArray) | ||
| .collect(Collectors.toList()); | ||
|
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||
| // Verify if the encrypted credentials are present in the obtained match list. | ||
| PasswordCheckResult result = | ||
| passwordLeak | ||
| .verify( | ||
| verification, | ||
| credentials.getReencryptedUserCredentialsHash().toByteArray(), | ||
| leakMatchPrefixes) | ||
| .get(); | ||
|
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||
| // Check if the credential is leaked. | ||
| boolean isLeaked = result.areCredentialsLeaked(); | ||
| System.out.printf("Is Credential leaked: %s", isLeaked); | ||
| } | ||
|
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||
| // Create a reCAPTCHA Enterprise assessment. | ||
| // Returns: PrivatePasswordLeakVerification which contains | ||
| // reencryptedUserCredentialsHash and credential breach database | ||
| // whose prefix matches the lookupHashPrefix. | ||
| private static PrivatePasswordLeakVerification createPasswordLeakAssessment( | ||
| String projectID, | ||
| String recaptchaSiteKey, | ||
| String token, | ||
| String recaptchaAction, | ||
| byte[] lookupHashPrefix, | ||
| byte[] encryptedUserCredentialsHash) | ||
| throws IOException { | ||
| try (RecaptchaEnterpriseServiceClient client = RecaptchaEnterpriseServiceClient.create()) { | ||
|
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| // Set the properties of the event to be tracked. | ||
| Event event = Event.newBuilder().setSiteKey(recaptchaSiteKey).setToken(token).build(); | ||
|
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| // Set the hashprefix and credentials hash. | ||
| // Setting this will trigger the Password leak protection. | ||
| PrivatePasswordLeakVerification passwordLeakVerification = | ||
| PrivatePasswordLeakVerification.newBuilder() | ||
| .setLookupHashPrefix(ByteString.copyFrom(lookupHashPrefix)) | ||
| .setEncryptedUserCredentialsHash(ByteString.copyFrom(encryptedUserCredentialsHash)) | ||
| .build(); | ||
|
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||
| // Build the assessment request. | ||
| CreateAssessmentRequest createAssessmentRequest = | ||
| CreateAssessmentRequest.newBuilder() | ||
| .setParent(String.format("projects/%s", projectID)) | ||
| .setAssessment( | ||
| Assessment.newBuilder() | ||
| .setEvent(event) | ||
| // Set request for Password leak verification. | ||
| .setPrivatePasswordLeakVerification(passwordLeakVerification) | ||
| .build()) | ||
| .build(); | ||
|
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||
| // Send the create assessment request. | ||
| Assessment response = client.createAssessment(createAssessmentRequest); | ||
|
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| // Check validity and integrity of the response. | ||
| if (!checkTokenIntegrity(response.getTokenProperties(), recaptchaAction)) { | ||
| return passwordLeakVerification; | ||
| } | ||
|
|
||
| // Get the reCAPTCHA Enterprise score. | ||
| float recaptchaScore = response.getRiskAnalysis().getScore(); | ||
| System.out.println("The reCAPTCHA score is: " + recaptchaScore); | ||
|
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||
| // Get the assessment name (id). Use this to annotate the assessment. | ||
| String assessmentName = response.getName(); | ||
| System.out.println( | ||
| "Assessment name: " + assessmentName.substring(assessmentName.lastIndexOf("/") + 1)); | ||
|
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| return response.getPrivatePasswordLeakVerification(); | ||
| } | ||
| } | ||
|
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| // Check for token validity and action integrity. | ||
| private static boolean checkTokenIntegrity( | ||
| TokenProperties tokenProperties, String recaptchaAction) { | ||
| // Check if the token is valid. | ||
| if (!tokenProperties.getValid()) { | ||
| System.out.println( | ||
| "The Password check call failed because the token was: " | ||
| + tokenProperties.getInvalidReason().name()); | ||
| return false; | ||
| } | ||
|
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||
| // Check if the expected action was executed. | ||
| if (!tokenProperties.getAction().equals(recaptchaAction)) { | ||
| System.out.printf( | ||
| "The action attribute in the reCAPTCHA tag '%s' does not match " | ||
| + "the action '%s' you are expecting to score", | ||
| tokenProperties.getAction(), recaptchaAction); | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
| } | ||
| // [END recaptcha_enterprise_password_leak_verification] |
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