3.5 KiB
Encryption
The example for encryption includes two individual examples for TLS and ALTS encryption mechanism respectively.
Try it
In each example's subdirectory:
go run server/main.go
go run client/main.go
Explanation
TLS
TLS is a commonly used cryptographic protocol to provide end-to-end communication security. In the example, we show how to set up a server authenticated TLS connection to transmit RPC.
In our grpc/credentials package, we provide several convenience methods to
create grpc
credentials.TransportCredentials
base on TLS. Refer to the
godoc for details.
In our example, we use the public/private keys created ahead:
- "server1.pem" contains the server certificate (public key).
- "server1.key" contains the server private key.
- "ca.pem" contains the certificate (certificate authority) that can verify the server's certificate.
On server side, we provide the paths to "server1.pem" and "server1.key" to
configure TLS and create the server credential using
credentials.NewServerTLSFromFile.
On client side, we provide the path to the "ca.pem" to configure TLS and create
the client credential using
credentials.NewClientTLSFromFile.
Note that we override the server name with "x.test.youtube.com", as the server
certificate is valid for *.test.youtube.com but not localhost. It is solely for
the convenience of making an example.
Once the credentials have been created at both sides, we can start the server
with the just created server credential (by calling
grpc.Creds) and let client dial
to the server with the created client credential (by calling
grpc.WithTransportCredentials)
And finally we make an RPC call over the created grpc.ClientConn to test the secure
connection based upon TLS is successfully up.
ALTS
ALTS is the Google's Application Layer Transport Security, which supports mutual authentication and transport encryption. Note that ALTS is currently only supported on Google Cloud Platform, and therefore you can only run the example successfully in a GCP environment. In our example, we show how to initiate a secure connection that is based on ALTS.
Unlike TLS, ALTS makes certificate/key management transparent to user. So it is easier to set up.
On server side, first call
alts.DefaultServerOptions
to get the configuration for alts and then provide the configuration to
alts.NewServerCreds
to create the server credential based upon alts.
On client side, first call
alts.DefaultClientOptions
to get the configuration for alts and then provide the configuration to
alts.NewClientCreds
to create the client credential based upon alts.
Next, same as TLS, start the server with the server credential and let client dial to server with the client credential.
Finally, make an RPC to test the secure connection based upon ALTS is successfully up.