Go言語を使用してネットワークセキュリティ機能を実装する方法

package main

import (
    "fmt"
    "log"
    "net/http"
)

func main() {
    http.HandleFunc("/", handler)
    err := http.ListenAndServeTLS(":8080", "server.crt", "server.key", nil)
    if err != nil {
        log.Fatal("ListenAndServe: ", err)
    }
}

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "Hello, World!")
}

package main

import (
    "crypto/aes"
    "crypto/cipher"
    "encoding/base64"
    "fmt"
    "log"
)

func main() {
    key := []byte("01234567890123456789012345678901")
    plaintext := []byte("Hello, World!")

    // 创建AES算法的加密器
    block, err := aes.NewCipher(key)
    if err != nil {
        log.Fatal(err)
    }

    // 使用CBC模式进行加密
    ciphertext := make([]byte, aes.BlockSize+len(plaintext))
    iv := ciphertext[:aes.BlockSize]
    if _, err := rand.Read(iv); err != nil {
        log.Fatal(err)
    }
    stream := cipher.NewCBCEncrypter(block, iv)
    stream.CryptBlocks(ciphertext[aes.BlockSize:], plaintext)

    // 将密文进行Base64编码
    encoded := base64.StdEncoding.EncodeToString(ciphertext)
    fmt.Println("Encoded:", encoded)

    // 解码并解密密文
    decoded, err := base64.StdEncoding.DecodeString(encoded)
    if err != nil {
        log.Fatal(err)
    }
    iv = decoded[:aes.BlockSize]
    ciphertext = decoded[aes.BlockSize:]
    stream = cipher.NewCBCDecrypter(block, iv)
    stream.CryptBlocks(ciphertext, ciphertext)

    fmt.Println("Decoded:", string(ciphertext))
}

package main

import (
    "github.com/google/nftables"
    "github.com/google/nftables/expr"
    "github.com/google/nftables/expr/equal"
    "github.com/vishvananda/netlink/nfnetlink"
    "log"
)

func main() {
    // 创建nftables客户端
    nftClient := &nftables.Conn{}
    err := nftClient.Open()
    if err != nil {
        log.Fatal(err)
    }
    defer nftClient.Close()

    // 创建一个新的表
    tableName := "filter"
    table := &nftables.Table{Family: nftables.TableFamilyIPv4, Name: tableName}
    err = nftClient.AddTable(table)
    if err != nil {
        log.Fatal(err)
    }

    // 创建一个新的chain
    chainName := "input"
    chain := &nftables.Chain{Name: chainName, Table: table}
    err = nftClient.AddChain(chain)
    if err != nil {
        log.Fatal(err)
    }

    // 添加规则到链上
    rule := &nftables.Rule{
        Chain: chain,
        Exprs: []expr.Any{
            &equal.Payload{
                Data: []byte("80"),
                Base: expr.PayloadBaseIP,
                Off:  expr.PayloadOffsetTransportHeader + 2,
            },
        },
        Target: &nftables.Verdict{
            Kind: nftables.VerdictDrop,
        },
    }
    err = nftClient.AddRule(rule)
    if err != nil {
        log.Fatal(err)
    }

    // 刷新防火墙规则并应用
    err = nfnetlink.NfSync()
    if err != nil {
        log.Fatal(err)
    }
}