golang实现openssl自签名双向认证的详细步骤

openssl genrsa -out ca.key 4096

[ req ]
default_bits       = 4096
distinguished_name = req_distinguished_name
[ req_distinguished_name ]
countryName                 = Country Name (2 letter code)
countryName_default         = CN
stateOrProvinceName         = State or Province Name (full name)
stateOrProvinceName_default = JiangSu
localityName                = Locality Name (eg, city)
localityName_default        = NanJing
organizationName            = Organization Name (eg, company)
organizationName_default    = Sheld
commonName                  = Common Name (e.g. server FQDN or YOUR name)
commonName_max              = 64
commonName_default          = localhost

openssl req \
  -new \
  -sha256 \
  -out ca.csr \
  -key ca.key \
  -config ca.conf

openssl x509 \
    -req \
    -days 3650 \
    -in ca.csr \
    -signkey ca.key \
    -out ca.pem

openssl genrsa -out server.key 2048

[ req ]
default_bits       = 2048
distinguished_name = req_distinguished_name
req_extensions     = req_ext
[ req_distinguished_name ]
countryName                 = Country Name (2 letter code)
countryName_default         = CN
stateOrProvinceName         = State or Province Name (full name)
stateOrProvinceName_default = JiangSu
localityName                = Locality Name (eg, city)
localityName_default        = NanJing
organizationName            = Organization Name (eg, company)
organizationName_default    = Sheld
commonName                  = Common Name (e.g. server FQDN or YOUR name)
commonName_max              = 64
commonName_default          = localhost    # 此处尤为重要，需要用该服务名字填写到客户端的代码中
[ req_ext ]
subjectAltName = @alt_names
[alt_names]
DNS.1   = localhost
IP.1      = 127.0.0.1

openssl req \
  -new \
  -sha256 \
  -out server.csr \
  -key server.key \
  -config server.conf

openssl genrsa -out client.key 2048

openssl genrsa -out client.key 2048

[ req ]
default_bits       = 2048
distinguished_name = req_distinguished_name
[ req_distinguished_name ]
countryName                 = Country Name (2 letter code)
countryName_default         = CN
stateOrProvinceName         = State or Province Name (full name)
stateOrProvinceName_default = JiangSu
localityName                = Locality Name (eg, city)
localityName_default        = NanJing
organizationName            = Organization Name (eg, company)
organizationName_default    = Sheld
commonName                  = Common Name (e.g. server FQDN or YOUR name)
commonName_max              = 64
commonName_default          = localhost

openssl req \
  -new \
  -sha256 \
  -out client.csr \
  -key client.key \
  -config client.conf

openssl x509 \
    -req \
    -days 3650 \
    -CA ca.pem \
    -CAkey ca.key \
    -CAcreateserial \
    -in client.csr \
    -out client.pem

package main
import (
	"crypto/tls"
	"crypto/x509"
	"fmt"
	"net/http"
	"os"
)
type MyHandler struct {
}
func (h *MyHandler) ServeHTTP(w http.ResponseWriter,
	r *http.Request) {
	fmt.Fprint(w, "Hello, HTTPS!")
}
func main() {
	pool := x509.NewCertPool() // 创建证书池
	caCertPath := "./cert/ca.pem"
	caCrt, err := os.ReadFile(caCertPath) // 读取本地CA证书文件
	if err != nil {
		fmt.Println("ReadFile err:", err)
		return
	}
	pool.AppendCertsFromPEM(caCrt) // 将证书添加到证书池中
	s := &http.Server{ // 创建 HTTP服务器实例，并设置服务器的监听地址（本例中是127.0.0.1:8088）、处理器（即上面定义的myhandler结构体）、以及TLS配置。
		Addr:    "127.0.0.1:8088",
		Handler: &MyHandler{},
		TLSConfig: &tls.Config{
			ClientCAs:  pool,                           // 指定客户端需要验证的CA证书池（即上面创建的pool）
			ClientAuth: tls.RequireAndVerifyClientCert, // 要求客户端在发送请求时必须携带证书
		},
	}
	err = s.ListenAndServeTLS("./cert/server.pem", "./cert/server.key")
	if err != nil {
		fmt.Println("ListenAndServeTLS err:", err)
	}
}

package main
import (
	"crypto/tls"
	"crypto/x509"
	"fmt"
	"io"
	"net/http"
	"os"
)
func main() {
	pool := x509.NewCertPool()    // 创建 x509.CertPool，用于存储CA证书
	caCertPath := "./cert/ca.pem" // 从文件中读取CA证书的内容
	caCrt, err := os.ReadFile(caCertPath)
	if err != nil {
		fmt.Println("ReadFile err:", err)
		return
	}
	pool.AppendCertsFromPEM(caCrt)                                               // 将CA证书添加到CertPool中
	cliCrt, err := tls.LoadX509KeyPair("./cert/client.pem", "./cert/client.key") //加载客户端证书和私钥
	if err != nil {
		fmt.Println("Loadx509keypair err:", err)
		return
	}
	tr := &http.Transport{ // 创建一个http.Transport，并配置TLS相关信息
		TLSClientConfig: &tls.Config{
			RootCAs:      pool,                      // 设置根证书池
			Certificates: []tls.Certificate{cliCrt}, // 设置客户端证书和私钥
		},
	}
	client := &http.Client{Transport: tr}             // 创建一个http.Client，并设置Transport为上面创建的Transport对象
	resp, err := client.Get("https://127.0.0.1:8088") // 使用创建的Client发送GET请求
	if err != nil {
		fmt.Println("Http Get error:", err)
		return
	}
	defer resp.Body.Close()
	body, err := io.ReadAll(resp.Body) // 读取并打印响应体的内容
	fmt.Println(string(body))
}

go run ./server/server.go

go run ./client/client.go