golang Golang SSL SMTP示例

Posted 2021-05-24

package main

import (
    "fmt"
	  "log"
    "net"
    "net/mail"
	  "net/smtp"
    "crypto/tls"
)

// SSL/TLS Email Example

func main() {

    from := mail.Address{"", "[e-mail]"}
    to   := mail.Address{"", "[e-mail]"}
    subj := "This is the email subject"
    body := "This is an example body.\n With two lines."

    // Setup headers
    headers := make(map[string]string)
    headers["From"] = from.String()
    headers["To"] = to.String()
    headers["Subject"] = subj

    // Setup message
    message := ""
    for k,v := range headers {
        message += fmt.Sprintf("%s: %s\r\n", k, v)
    }
    message += "\r\n" + body

    // Connect to the SMTP Server
    servername := "smtp.example.tld:465"

    host, _, _ := net.SplitHostPort(servername)

    auth := smtp.PlainAuth("","[e-mail]", "password", host)

    // TLS config
    tlsconfig := &tls.Config {
        InsecureSkipVerify: true,
        ServerName: host,
    }

    // Here is the key, you need to call tls.Dial instead of smtp.Dial
    // for smtp servers running on 465 that require an ssl connection
    // from the very beginning (no starttls)
    conn, err := tls.Dial("tcp", servername, tlsconfig)
    if err != nil {
        log.Panic(err)
    }

    c, err := smtp.NewClient(conn, host)
    if err != nil {
        log.Panic(err)
    }

    // Auth
    if err = c.Auth(auth); err != nil {
        log.Panic(err)
    }

    // To && From
    if err = c.Mail(from.Address); err != nil {
        log.Panic(err)
    }

    if err = c.Rcpt(to.Address); err != nil {
        log.Panic(err)
    }

    // Data
    w, err := c.Data()
    if err != nil {
        log.Panic(err)
    }

    _, err = w.Write([]byte(message))
    if err != nil {
        log.Panic(err)
    }

    err = w.Close()
    if err != nil {
        log.Panic(err)
    }

    c.Quit()

}

golang SSL客户端身份验证Golang示例

package main

import (
	"crypto/tls"
	"crypto/x509"
	"flag"
	"io/ioutil"
	"log"
	"net/http"
)

var (
	certFile = flag.String("cert", "someCertFile", "A PEM eoncoded certificate file.")
	keyFile  = flag.String("key", "someKeyFile", "A PEM encoded private key file.")
	caFile   = flag.String("CA", "someCertCAFile", "A PEM eoncoded CA's certificate file.")
)

func main() {
	flag.Parse()

	// Load client cert
	cert, err := tls.LoadX509KeyPair(*certFile, *keyFile)
	if err != nil {
		log.Fatal(err)
	}

	// Load CA cert
	caCert, err := ioutil.ReadFile(*caFile)
	if err != nil {
		log.Fatal(err)
	}
	caCertPool := x509.NewCertPool()
	caCertPool.AppendCertsFromPEM(caCert)

	// Setup HTTPS client
	tlsConfig := &tls.Config{
		Certificates: []tls.Certificate{cert},
		RootCAs:      caCertPool,
	}
	tlsConfig.BuildNameToCertificate()
	transport := &http.Transport{TLSClientConfig: tlsConfig}
	client := &http.Client{Transport: transport}

	// Do GET something
	resp, err := client.Get("https://goldportugal.local:8443")
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()

	// Dump response
	data, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatal(err)
	}
	log.Println(string(data))
}