第1步：生成 CA 根证书
👍 openssl genrsa -out ca.key 2048
Generating RSA private key, 2048 bit long modulus (2 primes)
.............+++++
..................................................................................................................+++++
e is 65537 (0x010001)👍 openssl req -new -x509 -days 3650 -key ca.key -out ca.pem
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:cn
State or Province Name (full name) [Some-State]:shanghai
Locality Name (eg, city) []:shanghai
Organization Name (eg, company) [Internet Widgits Pty Ltd]:custer
Organizational Unit Name (eg, section) []:custer
Common Name (e.g. server FQDN or YOUR name) []:localhost
Email Address []:第2步：用 openssl 生成 ca 和双方 SAN 证书。
准备默认 OpenSSL 配置文件于当前目录
linux系统在 : /etc/pki/tls/openssl.cnf
Mac系统在: /System/Library/OpenSSL/openssl.cnf
1：cp 目录到项目目录进行修改设置
cp /System/Library/OpenSSL/openssl.cnf /learn-gin/06.gin-grpc/keys
2：找到 [ CA_default ],打开 copy_extensions = copy
3：找到[ req ],打开 req_extensions = v3_req # The extensions to add to a certificate request
4：找到[ v3_req ],添加 subjectAltName = @alt_names
5：添加新的标签 [ alt_names ] , 和标签字段
[ alt_names ]
DNS.1 = localhost
DNS.2 = *.custer.fun这里填入需要加入到 Subject Alternative Names 段落中的域名名称，可以写入多个。
第3步：生成服务端证书
👍 openssl genpkey -algorithm RSA -out server.key
........................................................................................+++++
.......................................+++++👍 openssl req -new -nodes -key server.key -out server.csr -days 3650 -subj "/C=cn/OU=custer/O=custer/CN=localhost" -config ./openssl.cnf -extensions v3_req
Ignoring -days; not generating a certificate👍 openssl x509 -req -days 3650 -in server.csr -out server.pem -CA ca.pem -CAkey ca.key -CAcreateserial -extfile ./openssl.cnf -extensions v3_req
Signature ok
subject=C = cn, OU = custer, O = custer, CN = localhost
Getting CA Private Keyserver.csr是上面生成的证书请求文件。ca.pem/ca.key是CA证书文件和key，用来对server.csr进行签名认证。这两个文件在之前生成的。
第4步：生成客户端证书
👍 openssl genpkey -algorithm RSA -out client.key
........+++++
...........+++++👍 openssl req -new -nodes -key client.key -out client.csr -days 3650 -subj "/C=cn/OU=custer/O=custer/CN=localhost" -config ./openssl.cnf -extensions v3_req
Ignoring -days; not generating a certificate👍 openssl x509 -req -days 3650 -in client.csr -out client.pem -CA ca.pem -CAkey ca.key -CAcreateserial -extfile ./openssl.cnf -extensions v3_req
Signature ok
subject=C = cn, OU = custer, O = custer, CN = localhost
Getting CA Private Key现在 Go 1.15 以上版本的 GRPC 通信，这样就完成了使用自签CA、Server、Client证书和双向认证
服务端代码
func main() {
cert, _ := tls.LoadX509KeyPair("cert/server.pem", "cert/server.key")
certPool := x509.NewCertPool()
ca, _ := ioutil.ReadFile("cert/ca.pem")
certPool.AppendCertsFromPEM(ca)
creds := credentials.NewTLS(&tls.Config{
Certificates: []tls.Certificate{cert},
ClientAuth: tls.RequireAndVerifyClientCert,
ClientCAs: certPool,
})
rpcServer := grpc.NewServer(grpc.Creds(creds))
services.RegisterProdServiceServer(rpcServer, new(services.ProdService))
listen, _ := net.Listen("tcp", ":8081")
rpcServer.Serve(listen)
}客户端代码
func main() {
cert, _ := tls.LoadX509KeyPair("cert/client.pem", "cert/client.key")
certPool := x509.NewCertPool()
ca, _ := ioutil.ReadFile("cert/ca.pem")
certPool.AppendCertsFromPEM(ca)
creds := credentials.NewTLS(&tls.Config{
Certificates: []tls.Certificate{cert},
ServerName: "localhost",
RootCAs: certPool,
})
conn, err := grpc.Dial(":8081", grpc.WithTransportCredentials(creds))
if err != nil {
log.Fatal(err)
}
defer conn.Close()
prodClient := services.NewProdServiceClient(conn)
prodRes, err := prodClient.GetProdStock(context.Background(), &services.ProdRequest{ProdId: 12})
if err != nil {
log.Fatal(err)
}
log.Info(prodRes.ProdStock)
}有疑问加站长微信联系（非本文作者）
