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server.go
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server.go
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package server
import (
"context"
"crypto/tls"
"fmt"
"io"
"net"
"server/internal/net/http"
)
// DefaultAddress is the default listener address.
const DefaultAddress string = "127.0.0.1:8887"
// ConfigurationHeaderKey is the name of the header field that contains the RoundTripper configuration.
// Note that this key can only start with one capital letter and the rest in lowercase.
// Unfortunately, this seems to be a limitation of Burp's Extender API.
const ConfigurationHeaderKey = "Goroundtripperconfig"
var s *http.Server
func init() {
s = &http.Server{}
}
func StartServer(addr string) error {
ca, private, err := NewCertificateAuthority()
if err != nil {
return err
}
m := http.NewServeMux()
m.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
configHeader := r.Header.Get(ConfigurationHeaderKey)
rt, err := NewRoundTripperFromJson(configHeader)
if err != nil {
writeError(w, err)
return
}
r.Header.Del(ConfigurationHeaderKey)
res, err := rt.RoundTrip(r)
if err != nil {
writeError(w, err)
return
}
defer res.Body.Close()
// Write the response (back to burp).
for k, _ := range res.Header {
v := res.Header.Get(k)
w.Header().Set(k, v)
}
w.WriteHeader(res.StatusCode)
body, _ := io.ReadAll(res.Body)
w.Write(body)
})
s.Addr = addr
s.Handler = m
s.TLSConfig = &tls.Config{
Certificates: []tls.Certificate{
tls.Certificate{
Certificate: [][]byte{ca.Raw},
PrivateKey: private,
Leaf: ca,
},
},
NextProtos: []string{"http/1.1", "h2"},
}
listener, err := net.Listen("tcp", s.Addr)
if err != nil {
return err
}
tlsListener := tls.NewListener(listener, s.TLSConfig)
return s.Serve(tlsListener)
}
func StopServer() error {
return s.Shutdown(context.Background())
}
func writeError(w http.ResponseWriter, err error) {
w.WriteHeader(500)
fmt.Fprint(w, fmt.Errorf("Awesome TLS error: %s", err))
fmt.Println(err)
}