Configures a custom CA (Certificates Authority) certificates file.
Most applications should use the system's root certificates and should avoid setting this option unnecessarily.
The value of this option should be the name of a file in PEM format. Consult your security team and/or system administrator for the contents of this file. Be aware of the security implications of adding new CA certificates to this file. Only use trustworthy sources for the CA certificates.
The most common cases where this option is needed include:
Containerized applications that deploy without the system's root certificates and need to explicitly configure a root of trust.
Applications using gRPC-based services on Windows and macOS, where gRPC does not use the default root of trust. Though it might be possible to set the GRPC_DEFAULT_SSL_ROOTS_FILE_PATH environment variable instead.
You should set this option both in the credentials and in the connection google::cloud::Options parameter. For example:
namespace gc = ::google::cloud;
auto ca = gc::Options{}.set<gc::CARootsFilePathOption>("path/to/roots.pem");
auto credentials = gc::MakeServiceAccountCredentials(..., ca);
// Make a copy, only needed if you plan to use `ca` again.
auto opts = ca;
// Using bigtable to illustrate the option usage, this applies to all
// libraries in `google-cloud-cpp`.
auto connection = gc::bigtable::MakeDataConnection(
opts.set<gc::UnifiedCredentialsOption>(credentials));
// Use `connection` as usual.
For REST-based libraries this configures the CAINFO option in libcurl. These are used for all credentials that require authentication, including the default credentials.
[[["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 2025-03-05 UTC."],[[["This page documents the `CARootsFilePathOption` for configuring custom Certificate Authority (CA) certificates within Google Cloud C++ libraries."],["Setting the `CARootsFilePathOption` is generally not needed for most applications, as they should utilize the system's root certificates."],["This option is crucial for containerized apps without system root certificates and for gRPC services on Windows and macOS, as these often require explicit root of trust configuration."],["You must set this option in both the credentials and connection `google::cloud::Options` for it to be applied correctly, and it's essential to use only trustworthy CA certificate sources."],["The option configures the `pem_roots_cert` for gRPC based libraries and the CAINFO option in libcurl for REST based libraries, however gRPC has no programmatic way to set the default credentials, only by environment variables."]]],[]]
