iframe-proxy | Sunbelt Computer Software

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package tlsproxy

import (

"bufio"

"bytes"

"crypto/rand"

"crypto/tls"

"errors"

"fmt"

"io"

"io/ioutil"

"net"

"net/http"

"net/http/httptest"

"os"

"runtime"

"strings"

"sync/atomic"

"time"

"github.com/koding/logging"

"koding/klient/tunnel/tlsproxy/pem"

"koding/tools/util"

)

var defaultLog = logging.NewCustom("tlsproxy", false)

// Init adds local route for pem.Hostname to 127.0.0.1 address.

func Init() error {

if runtime.GOOS == "windows" {

return errors.New("not implemented")

}

f, err := os.OpenFile("/etc/hosts", os.O_RDWR|os.O_APPEND, 0644)

if err != nil {

return err

}

scanner := bufio.NewScanner(f)

for scanner.Scan() {

fields := strings.Fields(scanner.Text())

if len(fields) != 2 {

continue

}

if fields[0] == "127.0.0.1" && fields[1] == pem.Hostname {

f.Close()

return nil

}

if err := scanner.Err(); err != nil {

return err

}

_, err = fmt.Fprintln(f, "127.0.0.1", pem.Hostname)

return nonil(err, f.Close())

}

type Proxy struct {

Log logging.Logger

targetAddr string

listener net.Listener

closed uint32

once util.OnceSuccessful

}

func NewProxy(listenAddr, targetAddr string) (*Proxy, error) {

cert, err := pem.Asset("fullchain.pem")

if err != nil {

return nil, err

}

key, err := pem.Asset("privkey.pem")

if err != nil {

return nil, err

}

crt, err := tls.X509KeyPair(cert, key)

if err != nil {

return nil, err

}

cfg := &tls.Config{

Certificates: []tls.Certificate{crt},

Rand: rand.Reader,

// Don't offer SSL3.

MinVersion: tls.VersionTLS10,

// Workaround TLS_FALLBACK_SCSV bug. For details see:

// https://go-review.googlesource.com/#/c/1776/

MaxVersion: tls.VersionTLS12,

}

listener, err := tls.Listen("tcp", listenAddr, cfg)

if err != nil {

return nil, err

}

p := &Proxy{

Log: defaultLog,

targetAddr: targetAddr,

listener: listener,

}

go p.serve()

return p, nil

}

func (p *Proxy) Close() error {

if atomic.CompareAndSwapUint32(&p.closed, 0, 1) {

return p.listener.Close()

}

return nil

}

func (p *Proxy) writeError(op string, err error, conn net.Conn) {

body := bytes.NewBufferString(err.Error())

resp := &http.Response{

Status: http.StatusText(http.StatusServiceUnavailable),

StatusCode: http.StatusServiceUnavailable,

Proto: "HTTP/1.1",

ProtoMajor: 1,

ProtoMinor: 1,

Body: ioutil.NopCloser(body),

ContentLength: int64(body.Len()),

Close: true,

}

e := resp.Write(conn)

if e != nil {

p.Log.Error("%s: error %s (%s) and sending response back (%s)", conn.RemoteAddr(), op, err, e)

} else {

p.Log.Error("%s: error %s: %s", conn.RemoteAddr(), op, err)

}

func (p *Proxy) serve() {

for {

conn, err := p.listener.Accept()

if err != nil {

if atomic.LoadUint32(&p.closed) != 1 {

p.Log.Error("error listening for connections: %s", err)

}

return

}

go p.serveConn(conn)

}

func (p *Proxy) serveConn(conn net.Conn) {

req, err := http.ReadRequest(bufio.NewReader(conn))

if err != nil {

p.Log.Error("%s: error reading initial request: %s", conn.RemoteAddr(), err)

conn.Close()

return

}

rec := httptest.NewRecorder()

if util.HandleCORS(rec, req) {

resp := &http.Response{

Status: http.StatusText(rec.Code),

StatusCode: rec.Code,

Proto: "HTTP/1.1",

ProtoMajor: 1,

ProtoMinor: 1,

Header: rec.HeaderMap,

Close: true,

}

if rec.Body != nil {

resp.Body = ioutil.NopCloser(rec.Body)

resp.ContentLength = int64(rec.Body.Len())

}

if err := resp.Write(conn); err != nil {

p.Log.Error("%s: error writing CORS reply: %s", conn.RemoteAddr(), err)

}

conn.Close()

return

}

target, err := net.DialTimeout("tcp", p.targetAddr, 30*time.Second)

if err != nil {

p.writeError("dialing target", err, conn)

conn.Close()

return

}

if err = req.Write(target); err != nil {

p.writeError("writing initial request to target", err, conn)

nonil(target.Close(), conn.Close())

return

}

go io.Copy(conn, target)

go io.Copy(target, conn)

}

func nonil(err ...error) error {

for _, e := range err {

if e != nil {

return e

}

return nil

}

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PL/B Language Development and Support

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