sshoneypot.go

package main

import (
    "crypto/ed25519"
    "crypto/rand"
    "errors"
    "log"
    "net"

    "golang.org/x/crypto/ssh"
)

func main() {
    _, priv, _ := ed25519.GenerateKey(rand.Reader)
    signer, _ := ssh.NewSignerFromKey(priv)

    cfg := &ssh.ServerConfig{
        PasswordCallback: func(conn ssh.ConnMetadata, password []byte) (*ssh.Permissions, error) {
            log.Printf("SSH login attempt: user=%s pass=%s from=%s",
                conn.User(), string(password), conn.RemoteAddr())
            return nil, errors.New("permission denied")
        },
        ServerVersion: "SSH-2.0-OpenSSH_8.9p1", 
    }
    cfg.AddHostKey(signer)

    l, _ := net.Listen("tcp", "0.0.0.0:22")
    log.Println("Listening on 0.0.0.0:22")

    for {
        conn, _ := l.Accept()
        go func(c net.Conn) {
            defer c.Close()
            ssh.NewServerConn(c, cfg) 
        }(conn)
    }
}