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|
package main
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"flag"
"fmt"
"log"
"math/big"
"net"
"net/http"
"sync"
"syscall"
"time"
"github.com/elazarl/goproxy"
)
var (
certificate = *flag.String("certificate", "", "Path to x509 Certificate fille")
key = *flag.String("key", "", "Path to the private key file")
host = *flag.String("host", "127.0.0.1", "Interface to bind to")
port = *flag.String("port", "8080", "Port to bind to")
verbose = *flag.Bool("verbose", false, "Enable verbose output")
)
type CertificateStore struct {
certs map[string]*tls.Certificate
locks map[string]*sync.Mutex
sync.Mutex
}
func (s *CertificateStore) Fetch(host string, generate func() (*tls.Certificate, error)) (*tls.Certificate, error) {
hostLock := s.LockFor(host)
hostLock.Lock()
defer hostLock.Unlock()
cert, ok := s.certs[host]
var err error
if !ok {
cert, err = generate()
if err != nil {
return nil, err
}
s.certs[host] = cert
}
return cert, nil
}
func (s *CertificateStore) LockFor(host string) *sync.Mutex {
s.Lock()
defer s.Unlock()
lock, ok := s.locks[host]
if !ok {
lock = &sync.Mutex{}
s.locks[host] = lock
}
return lock
}
func listenAddress() string {
return fmt.Sprintf("%s:%s", host, port)
}
func generateSelfSignedCert() (tls.Certificate, error) {
priv, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
log.Fatal(err)
}
template := x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{Organization: []string{"xlg"}},
NotBefore: time.Now(),
NotAfter: time.Now().Add(time.Hour * 24 * 365),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
IsCA: true,
}
if ip := net.ParseIP(host); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, host)
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
log.Fatal(err)
}
crtPem := &bytes.Buffer{}
pem.Encode(crtPem, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
keyPem := &bytes.Buffer{}
pem.Encode(keyPem, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
return tls.X509KeyPair(crtPem.Bytes(), keyPem.Bytes())
}
func certFrom(certificate, key string) (tls.Certificate, error) {
if certificate != "" && key != "" {
return tls.LoadX509KeyPair(certificate, key)
}
return generateSelfSignedCert()
}
func main() {
flag.Parse()
ca, err := certFrom(certificate, key)
if err != nil {
log.Fatal(err)
}
goproxy.GoproxyCa = ca
goproxy.OkConnect = &goproxy.ConnectAction{Action: goproxy.ConnectAccept, TLSConfig: goproxy.TLSConfigFromCA(&ca)}
goproxy.MitmConnect = &goproxy.ConnectAction{Action: goproxy.ConnectMitm, TLSConfig: goproxy.TLSConfigFromCA(&ca)}
goproxy.HTTPMitmConnect = &goproxy.ConnectAction{Action: goproxy.ConnectHTTPMitm, TLSConfig: goproxy.TLSConfigFromCA(&ca)}
goproxy.RejectConnect = &goproxy.ConnectAction{Action: goproxy.ConnectReject, TLSConfig: goproxy.TLSConfigFromCA(&ca)}
proxy := goproxy.NewProxyHttpServer()
proxy.Verbose = verbose
dialer := &net.Dialer{Control: func(network, address string, conn syscall.RawConn) error { return nil }}
proxy.Tr = &http.Transport{
Dial: dialer.Dial,
DialContext: dialer.DialContext,
TLSClientConfig: &tls.Config{},
Proxy: http.ProxyFromEnvironment,
}
proxy.CertStore = &CertificateStore{
certs: map[string]*tls.Certificate{},
locks: map[string]*sync.Mutex{},
}
proxy.OnRequest().HandleConnect(goproxy.AlwaysMitm)
proxy.OnRequest().DoFunc(func(r *http.Request, p *goproxy.ProxyCtx) (*http.Request, *http.Response) {
log.Printf("%s %s\n", r.Method, r.URL)
if proxy.Verbose {
for k, v := range r.Header {
log.Printf("%s: %v\n", k, v)
}
}
return r, nil
})
proxy.OnResponse().DoFunc(func(r *http.Response, p *goproxy.ProxyCtx) *http.Response {
if r == nil {
log.Printf("No response from server\n")
return r
}
log.Printf("%d %s\n", r.StatusCode, r.Request.URL)
if proxy.Verbose {
for k, v := range r.Header {
log.Printf("%s: %v\n", k, v)
}
}
return r
})
address := listenAddress()
log.Printf("Listening and serving HTTP on http://%s\n", address)
log.Fatal(http.ListenAndServe(address, proxy))
}
|
