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Showing content from https://cloud.google.com/cpp/docs/reference/oslogin/2.36.0/oslogin-override-authentication below:

C++ Client Libraries | Google Cloud

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• 2.42.0-rc (latest)
• 2.41.0
• 2.40.0
• 2.39.0
• 2.38.0
• 2.37.0
• 2.36.0
• 2.35.0
• 2.34.0
• 2.33.0
• 2.32.0
• 2.31.0
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• 2.11.0

Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:

  [](std::string const& keyfile) {
    auto is = std::ifstream(keyfile);
    is.exceptions(std::ios::badbit);  // Minimal error handling in examples
    auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
    auto options =
        google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
            google::cloud::MakeServiceAccountCredentials(contents));
    return google::cloud::oslogin_v1::OsLoginServiceClient(
        google::cloud::oslogin_v1::MakeOsLoginServiceConnection(options));
  }

Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.

Authentication Components - for more information on the factory functions to create google::cloud::Credentials objects.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This webpage provides documentation for various versions of the C++ OS Login client library, ranging from version 2.11.0 to 2.37.0-rc, with links to the documentation for each release regarding overriding authentication."],["The latest release candidate version for the OS Login client library is 2.37.0-rc, and the current stable release is version 2.36.0."],["The OS Login client libraries typically use Application Default Credentials for authentication, but you can override this by using `UnifiedCredentialsOption`."],["To override the default credentials, you can explicitly load a service account key file, as shown in the provided example using `google::cloud::MakeServiceAccountCredentials`."],["This page links to an external document for the best practices when managing service account keys, and another for more details on the components used to authenticate."]]],[]]

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