grpc-bssl: BoringSSL TLS implementation for grpc-rust - #2846
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Expose internal sealing type (Internal), credentials modules (client, server, and common), and I/O and runtime adapters under the __unstable feature flag. This allows out-of-tree implementations of different TLS stacks through the ChannelCredentials and ServerCredentials traits.
Add the grpc-bssl crate with client and server TLS credentials (BsslChannelCredentials and BsslServerCredentials) built on bssl-tls and bssl-tls-tokio. To let external crates provide custom credentials, this exposes the internal token, EndpointIoStream, StreamEndpoint, and default_runtime under the __unstable feature flag in grpc, and makes credentials modules public. Also add setup-boringssl CI action and workflow configuration for BoringSSL across Linux, macOS, and Windows.
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Motivation
Grpc-rust currently supports rustls for transport security. Some environments want to use grpc-rust but standardize on other TLS libraries (such as BoringSSL).
Solution
This implements the
ChannelCredentialsandServerCredentailstrait for BoringSSL in a newgrpc-bsslcrate, enabling BoringSSL based transport security with grpc-rust.