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proxy.go
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proxy.go
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package main
import (
"bufio"
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/base64"
"encoding/pem"
"flag"
"fmt"
"encoding/gob"
"golang.org/x/net/proxy"
"log"
"math/big"
"net"
"os"
"path/filepath"
"regexp"
"strings"
"time"
)
var no_color bool
var verbose bool
var conf_dir string
var proxy_port string
var tor_server string
var tor_port string
var reg_server string
var lookup_server1 string
var lookup_server2 string
var epoch_len int
var dataenc_bytes int
var c_clear string
var c_client string
var c_server string
var c_arrow string
var c_plt string
var c_tls string
var c_contacts string
var c_online string
var c_offline string
var c_alias string
var tor_dialer proxy.Dialer
var user_server string
var crt tls.Certificate
func main() {
flag.BoolVar(&no_color, "nc", false, "Disable colored logging")
flag.BoolVar(&verbose, "v", false, "Enable Verbose logging")
flag.StringVar(&conf_dir, "c", "dp5_conf", "Configuration directory")
flag.StringVar(&proxy_port, "p", "8080", "Proxy port")
flag.StringVar(&tor_server, "ts", "localhost", "Tor server")
flag.StringVar(&tor_port, "tp", "9050", "Tor port")
flag.StringVar(®_server, "r", "dp5.szechuen.com:8443", "Registration Server")
flag.StringVar(&lookup_server1, "l1", "dp5-lu1.szechuen.com:8443", "Lookup Server 1")
flag.StringVar(&lookup_server2, "l2", "dp5-lu2.szechuen.com:8443", "Lookup Server 2")
flag.IntVar(&epoch_len, "e", 30, "Epoch length")
flag.IntVar(&dataenc_bytes, "d", 48, "Ciphertext length")
flag.Parse()
if !no_color {
c_clear = "\033[0m"
c_client = "\033[1m\033[94m"
c_server = "\033[1m\033[95m"
c_arrow = "\033[1m"
c_plt = "\033[91m"
c_tls = "\033[92m"
c_contacts = "\033[1m"
c_online = "\033[1m\033[92m"
c_offline = "\033[1m\033[91m"
c_alias = "\033[92m"
} else {
c_clear = ""
c_client = ""
c_server = ""
c_arrow = ""
c_plt = ""
c_tls = ""
c_contacts = ""
c_online = ""
c_offline = ""
c_alias = ""
}
td, err := proxy.SOCKS5("tcp", tor_server + ":" + tor_port, nil, proxy.Direct)
if err != nil { log.Fatal(err) }
tor_dialer = td
user_server = ""
dp5_init()
go dp5_loop()
crt_ptr, err := SelfCertificateInit()
if err != nil { log.Fatal(err) }
crt = *crt_ptr
gob.Register(crt)
gob.Register(crt.PrivateKey)
crt_path := filepath.Join(conf_dir, "proxy.crt")
if !stat(crt_path, false, false) {
f, err := os.Create(crt_path)
if err != nil { log.Fatal(err) }
enc := gob.NewEncoder(f)
err = enc.Encode(&crt)
if err != nil { log.Fatal(err) }
f.Close()
} else {
f, err := os.Open(crt_path)
if err != nil { log.Fatal(err) }
dec := gob.NewDecoder(f)
err = dec.Decode(&crt)
if err != nil { log.Fatal(err) }
f.Close()
}
pem_path := filepath.Join(conf_dir, "proxy.pem")
if !stat(pem_path, false, false) {
f, err := os.Create(pem_path)
if err != nil { log.Fatal(err) }
pem.Encode(f, &pem.Block{Type: "CERTIFICATE", Bytes: crt.Certificate[0]})
f.Close()
}
l, err := net.Listen("tcp", ":" + proxy_port)
if err != nil { log.Fatal(err) }
log.Println("Proxy listening on TCP *:" + proxy_port + " (HTTP)...")
for {
conn, err := l.Accept()
if err != nil {
log.Println(err)
continue
}
if verbose { log.Println("Accepted TCP connection") }
handle_conn(conn)
}
l.Close()
dp5_cleanup()
}
func handle_conn(client net.Conn) {
client_r := bufio.NewReader(client)
proxy_req, err := client_r.ReadString('\n')
if err != nil {
log.Println(err)
client.Close()
return
}
var host string
var http_ver string
n, err := fmt.Sscanf(proxy_req, "CONNECT %s HTTP/%s\r\n", &host, &http_ver)
if err != nil {
log.Println(err)
client.Close()
return
} else if n != 2 {
log.Println("Incorrect proxy protocol")
client.Close()
return
}
if verbose { log.Printf("Received CONNECT request for %s", host) }
server, err := tor_dialer.Dial("tcp", host)
if err != nil {
fmt.Fprintf(client, "HTTP/%s 502 Bad Gateway\r\n\r\n", http_ver)
client.Close()
log.Printf("Failed to dial for %s, rejecting CONNECT request...", host)
log.Println(err)
return
}
fmt.Fprintf(client, "HTTP/%s 200 OK\r\n\r\n", http_ver)
client_r.Reset(client)
if verbose { log.Printf("Successfully dialed for %s, accepting CONNECT request...", host) }
server_r := bufio.NewReader(server)
client_en := true
client_tls_en := false
server_en := true
server_tls_en := false
var client_tls, server_tls *tls.Conn
var client_tls_r, server_tls_r *bufio.Reader
spoof_client := strings.NewReplacer()
spoof_server := strings.NewReplacer()
var pass_server string
var userpass_server_b64 string
var reg_id string
reg_success := false
go func() {
var req string
for {
if client_en {
req, err = client_r.ReadString('>')
if err != nil {
log.Println(err)
user_server = ""
client.Close()
server.Close()
return
}
if len(req) == 0 { continue }
} else {
for !client_tls_en {}
req, err = client_tls_r.ReadString('>')
if err != nil {
log.Println(err)
user_server = ""
client_tls.Close()
server_tls.Close()
return
}
if len(req) == 0 { continue }
}
if server_en {
if verbose { log.Printf("%sClient%s %s-->%s %sServer%s %s[PLT]%s %s", c_client, c_clear, c_arrow, c_clear, c_server, c_clear, c_plt, c_clear, req) }
fmt.Fprintf(server, req)
if req == "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>" || req == "<starttls xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\"/>" {
for !client_tls_en {}
}
} else {
for !server_tls_en {}
auth, _ := regexp.MatchString("<auth.*", req)
if auth {
b := make([]byte, 32)
rand.Read(b)
user_server = (base64.RawURLEncoding.EncodeToString(b))[:32]
b = make([]byte, 32)
rand.Read(b)
pass_server = base64.RawURLEncoding.EncodeToString(b)[:32]
userpass_server_b64 = base64.StdEncoding.EncodeToString([]byte("\x00" + user_server + "\x00" + pass_server))
b = make([]byte, 16)
rand.Read(b)
reg_id = base64.RawURLEncoding.EncodeToString(b)[:16]
reg_req := fmt.Sprintf("<iq type='set' id='%s'><query xmlns='jabber:iq:register'><x xmlns='jabber:x:data' type='submit'><field var='username'><value>%s</value></field><field var='password'><value>%s</value></field></x></query></iq>", reg_id, user_server, pass_server)
if verbose { log.Printf("%sClient%s %sxxx%s %sServer%s %s[TLS]%s %s", c_client, c_clear, c_arrow, c_clear, c_server, c_clear, c_tls, c_clear, reg_req) }
fmt.Fprintf(server_tls, reg_req)
for !reg_success {}
if verbose { log.Println("Successfully registered userpass") }
}
re := regexp.MustCompile("(.*?)</auth>")
userpass_client_b64 := re.FindStringSubmatch(req)
if userpass_client_b64 != nil {
userpass_client, _ := base64.StdEncoding.DecodeString(userpass_client_b64[1])
user_client := strings.Split(string(userpass_client), string('\x00'))[1]
spoof_client = strings.NewReplacer(userpass_client_b64[1], userpass_server_b64, user_client, user_server, strings.ToLower(user_client), strings.ToLower(user_server))
spoof_server = strings.NewReplacer(user_server, user_client, strings.ToLower(user_server), strings.ToLower(user_client))
if verbose { log.Printf("Updated spoof replacers") }
}
req_replace := spoof_client.Replace(req)
for _, v := range dp5_spoof_client {
req_replace = v.Replace(req_replace)
}
if req != req_replace {
if verbose { log.Printf("%sClient%s %sxxx%s %sServer%s %s[TLS]%s %s", c_client, c_clear, c_arrow, c_clear, c_server, c_clear, c_tls, c_clear, req_replace) }
} else {
if verbose { log.Printf("%sClient%s %s-->%s %sServer%s %s[TLS]%s %s", c_client, c_clear, c_arrow, c_clear, c_server, c_clear, c_tls, c_clear, req) }
}
fmt.Fprintf(server_tls, req_replace)
}
}
}()
go func() {
var res string
for {
if server_en {
res, err = server_r.ReadString('>')
if err != nil {
log.Println(err)
user_server = ""
server.Close()
client.Close()
return
}
if len(res) == 0 { continue }
} else {
for !server_tls_en {}
res, err = server_tls_r.ReadString('>')
if err != nil {
log.Println(err)
user_server = ""
server_tls.Close()
client_tls.Close()
return
}
if len(res) == 0 { continue }
}
if client_en {
if verbose { log.Printf("%sServer%s %s-->%s %sClient%s %s[PLT]%s %s", c_server, c_clear, c_arrow, c_clear, c_client, c_clear, c_plt, c_clear, res) }
fmt.Fprintf(client, res)
if res == "<proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>" || res == "<proceed xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\"/>" {
client_en = false
server_en = false
if verbose { log.Println("Starting TLS with server...") }
server_tls = tls.Client(server, &tls.Config{
ServerName: strings.Split(host, ":")[0],
})
server_tls_r = bufio.NewReader(server_tls)
if(verbose) { log.Print("Started TLS with server") }
if(verbose) { log.Print("Starting TLS with client...") }
crt_x509, err := x509.ParseCertificate(bytes.Join(crt.Certificate, []byte("")))
if err != nil { log.Fatal(err) }
log.Printf("Certificate Fingerprint: %X", sha1.Sum(crt_x509.Raw))
client_tls = tls.Server(client, &tls.Config{
Certificates: []tls.Certificate{crt},
})
client_tls_r = bufio.NewReader(client_tls)
if(verbose) { log.Print("Started TLS with client") }
client_tls_en = true
server_tls_en = true
}
} else {
for !client_tls_en {}
mech_start, _ := regexp.MatchString("<mechanism>", res)
mech_end, _ := regexp.MatchString(".*</mechanism>", res)
if mech_start || mech_end {
if res == "PLAIN</mechanism>" {
if verbose { log.Printf("%sServer%s %sxxx%s %sClient%s %s[TLS]%s %s", c_server, c_clear, c_arrow, c_clear, c_client, c_clear, c_tls, c_clear, "<mechanism>PLAIN</mechanism>") }
fmt.Fprintf(client_tls, "<mechanism>PLAIN</mechanism>")
continue
} else {
if verbose { log.Printf("%sServer%s %sxxx%s %sClient%s %s[TLS]%s %s %s", c_server, c_clear, c_arrow, c_clear, c_client, c_clear, c_tls, c_clear, "[DROPPED]", res) }
continue
}
}
auth, _ := regexp.MatchString("<iq id='" + reg_id + "'.*", res)
if auth {
if verbose { log.Printf("%sServer%s %sxxx%s %sClient%s %s[TLS]%s %s %s", c_server, c_clear, c_arrow, c_clear, c_client, c_clear, c_tls, c_clear, "[DROPPED]", res) }
reg_success = true
continue
}
res_replace := spoof_server.Replace(res)
for _, v := range dp5_spoof_server {
res_replace = v.Replace(res_replace)
}
if res != res_replace {
if verbose { log.Printf("%sServer%s %sxxx%s %sClient%s %s[TLS]%s %s", c_server, c_clear, c_arrow, c_clear, c_client, c_clear, c_tls, c_clear, res_replace) }
} else {
if verbose { log.Printf("%sServer%s %s-->%s %sClient%s %s[TLS]%s %s", c_server, c_clear, c_arrow, c_clear, c_client, c_clear, c_tls, c_clear, res) }
}
fmt.Fprintf(client_tls, res_replace)
}
}
}()
}
// Adapted from src/crypto/tls/generate_cert.go
func SelfCertificate(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, err
}
notBefore := time.Now()
notAfter := notBefore.Add(365*24*time.Hour)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, err
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"DP5 Proxy"},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
h := clientHello.ServerName
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
// template.IsCA = true
// template.KeyUsage |= x509.KeyUsageCertSign
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
return nil, err
}
cert := tls.Certificate{
Certificate: [][]byte{derBytes},
PrivateKey: priv,
}
cert_x509, err := x509.ParseCertificate(derBytes)
if err != nil {
return nil, err
}
log.Printf("Certificate Fingerprint: %X", sha1.Sum(cert_x509.Raw))
return &cert, nil
}
// Adapted from src/crypto/tls/generate_cert.go
func SelfCertificateInit() (*tls.Certificate, error) {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, err
}
notBefore := time.Now()
notAfter := notBefore.Add(365*24*time.Hour)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, err
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"DP5 Proxy"},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
h := "localhost"
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
// template.IsCA = true
// template.KeyUsage |= x509.KeyUsageCertSign
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
return nil, err
}
cert := tls.Certificate{
Certificate: [][]byte{derBytes},
PrivateKey: priv,
}
return &cert, nil
}