mTLS authentication example

A simple demonstration of using CA-signed certificates to implement mTLS in Go.

Running instructions

1. Clone the repository.

2. Start the server in the terminal.

$ go run . --server

3. Start the client in a different terminal.

$ go run .

Key re-generation

1. Generate CA private key, use the password "foo".

openssl genrsa -des3 -out ca.key 2048

2. Generate the root public key:

openssl req -x509 -new -nodes -key ca.key -sha256 -days 1825 -out ca.pem

3. Generate client private key:

openssl genrsa -out client.key 2048

4. Generate the client certificate service request.

openssl req -new -key client.key -out client.csr

5. Generate the client certificate. Use the CA password "foo".

openssl x509 -req -in client.csr -CA ca.pem -CAkey ca.key -CAcreateserial -out client.crt -days 825 -sha256 -extfile tls.ext

6. Generate server private key:

openssl genrsa -out server.key 2048

7. Generate the server certificate service request.

openssl req -new -key server.key -out server.csr

8. Generate the server certificate. Use the CA password "foo".

openssl req -x509 -new -CA ca.pem -CAkey ca.key -CAcreateserial -key server.key -out server.crt -days 825 -sha256