mirror of
https://github.com/cbeuw/Cloak.git
synced 2024-11-11 13:11:03 +00:00
277 lines
6.9 KiB
Go
277 lines
6.9 KiB
Go
//build !android
|
|
|
|
package main
|
|
|
|
// TODO: rewrite this. Think of another way of admin control
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/hmac"
|
|
"crypto/rand"
|
|
"crypto/sha256"
|
|
"encoding/base64"
|
|
"encoding/binary"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"log"
|
|
"net"
|
|
|
|
"github.com/cbeuw/Cloak/internal/client"
|
|
"github.com/cbeuw/Cloak/internal/client/TLS"
|
|
"github.com/cbeuw/Cloak/internal/util"
|
|
)
|
|
|
|
type UserInfo struct {
|
|
UID []byte
|
|
// ALL of the following fields have to be accessed atomically
|
|
SessionsCap uint32
|
|
UpRate int64
|
|
DownRate int64
|
|
UpCredit int64
|
|
DownCredit int64
|
|
ExpiryTime int64
|
|
}
|
|
|
|
type administrator struct {
|
|
adminConn net.Conn
|
|
adminUID []byte
|
|
}
|
|
|
|
func adminPrompt(sta *client.State) error {
|
|
a, err := adminHandshake(sta)
|
|
if err != nil {
|
|
log.Println(err)
|
|
return err
|
|
}
|
|
fmt.Println(`1 listActiveUsers none []uids
|
|
2 listAllUsers none []userinfo
|
|
3 getUserInfo uid userinfo
|
|
4 addNewUser userinfo ok
|
|
5 delUser uid ok
|
|
6 syncMemFromDB uid ok
|
|
|
|
7 setSessionsCap uid cap ok
|
|
8 setUpRate uid rate ok
|
|
9 setDownRate uid rate ok
|
|
10 setUpCredit uid credit ok
|
|
11 setDownCredit uid credit ok
|
|
12 setExpiryTime uid time ok
|
|
13 addUpCredit uid delta ok
|
|
14 addDownCredit uid delta ok`)
|
|
buf := make([]byte, 16000)
|
|
for {
|
|
req, err := a.getRequest()
|
|
if err != nil {
|
|
log.Println(err)
|
|
continue
|
|
}
|
|
a.adminConn.Write(req)
|
|
n, err := a.adminConn.Read(buf)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
resp, err := a.checkAndDecrypt(buf[:n])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
fmt.Println(string(resp))
|
|
}
|
|
}
|
|
|
|
func adminHandshake(sta *client.State) (*administrator, error) {
|
|
fmt.Println("Enter the ip:port of your server")
|
|
var addr string
|
|
fmt.Scanln(&addr)
|
|
fmt.Println("Enter the admin UID")
|
|
var b64AdminUID string
|
|
fmt.Scanln(&b64AdminUID)
|
|
adminUID, err := base64.StdEncoding.DecodeString(b64AdminUID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
sta.UID = adminUID
|
|
|
|
remoteConn, err := net.Dial("tcp", addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
clientHello := TLS.ComposeInitHandshake(sta)
|
|
_, err = remoteConn.Write(clientHello)
|
|
|
|
// Three discarded messages: ServerHello, ChangeCipherSpec and Finished
|
|
discardBuf := make([]byte, 1024)
|
|
for c := 0; c < 3; c++ {
|
|
_, err = util.ReadTLS(remoteConn, discardBuf)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
reply := TLS.ComposeReply()
|
|
_, err = remoteConn.Write(reply)
|
|
a := &administrator{remoteConn, adminUID}
|
|
return a, nil
|
|
}
|
|
|
|
func (a *administrator) getRequest() (req []byte, err error) {
|
|
promptUID := func() []byte {
|
|
fmt.Println("Enter UID")
|
|
var b64UID string
|
|
fmt.Scanln(&b64UID)
|
|
ret, _ := base64.StdEncoding.DecodeString(b64UID)
|
|
return ret
|
|
}
|
|
|
|
promptInt64 := func(name string) []byte {
|
|
fmt.Println("Enter New " + name)
|
|
var val int64
|
|
fmt.Scanln(&val)
|
|
ret := make([]byte, 8)
|
|
binary.BigEndian.PutUint64(ret, uint64(val))
|
|
return ret
|
|
}
|
|
promptUint32 := func(name string) []byte {
|
|
fmt.Println("Enter New " + name)
|
|
var val uint32
|
|
fmt.Scanln(&val)
|
|
ret := make([]byte, 4)
|
|
binary.BigEndian.PutUint32(ret, val)
|
|
return ret
|
|
}
|
|
|
|
fmt.Println("Select your command")
|
|
var cmd string
|
|
fmt.Scanln(&cmd)
|
|
switch cmd {
|
|
case "1":
|
|
req = a.request([]byte{0x01})
|
|
case "2":
|
|
req = a.request([]byte{0x02})
|
|
case "3":
|
|
UID := promptUID()
|
|
req = a.request(append([]byte{0x03}, UID...))
|
|
case "4":
|
|
var uinfo UserInfo
|
|
var b64UID string
|
|
fmt.Printf("UID:")
|
|
fmt.Scanln(&b64UID)
|
|
UID, _ := base64.StdEncoding.DecodeString(b64UID)
|
|
uinfo.UID = UID
|
|
fmt.Printf("SessionsCap:")
|
|
fmt.Scanf("%d", &uinfo.SessionsCap)
|
|
fmt.Printf("UpRate:")
|
|
fmt.Scanf("%d", &uinfo.UpRate)
|
|
fmt.Printf("DownRate:")
|
|
fmt.Scanf("%d", &uinfo.DownRate)
|
|
fmt.Printf("UpCredit:")
|
|
fmt.Scanf("%d", &uinfo.UpCredit)
|
|
fmt.Printf("DownCredit:")
|
|
fmt.Scanf("%d", &uinfo.DownCredit)
|
|
fmt.Printf("ExpiryTime:")
|
|
fmt.Scanf("%d", &uinfo.ExpiryTime)
|
|
marshed, _ := json.Marshal(uinfo)
|
|
req = a.request(append([]byte{0x04}, marshed...))
|
|
case "5":
|
|
UID := promptUID()
|
|
fmt.Println("Are you sure to delete this user? y/n")
|
|
var ans string
|
|
fmt.Scanln(&ans)
|
|
if ans != "y" && ans != "Y" {
|
|
return
|
|
}
|
|
req = a.request(append([]byte{0x05}, UID...))
|
|
case "6":
|
|
UID := promptUID()
|
|
req = a.request(append([]byte{0x06}, UID...))
|
|
case "7":
|
|
arg := make([]byte, 36)
|
|
copy(arg, promptUID())
|
|
copy(arg[32:], promptUint32("SessionsCap"))
|
|
req = a.request(append([]byte{0x07}, arg...))
|
|
case "8":
|
|
arg := make([]byte, 40)
|
|
copy(arg, promptUID())
|
|
copy(arg[32:], promptInt64("UpRate"))
|
|
req = a.request(append([]byte{0x08}, arg...))
|
|
case "9":
|
|
arg := make([]byte, 40)
|
|
copy(arg, promptUID())
|
|
copy(arg[32:], promptInt64("DownRate"))
|
|
req = a.request(append([]byte{0x09}, arg...))
|
|
case "10":
|
|
arg := make([]byte, 40)
|
|
copy(arg, promptUID())
|
|
copy(arg[32:], promptInt64("UpCredit"))
|
|
req = a.request(append([]byte{0x0a}, arg...))
|
|
case "11":
|
|
arg := make([]byte, 40)
|
|
copy(arg, promptUID())
|
|
copy(arg[32:], promptInt64("DownCredit"))
|
|
req = a.request(append([]byte{0x0b}, arg...))
|
|
case "12":
|
|
arg := make([]byte, 40)
|
|
copy(arg, promptUID())
|
|
copy(arg[32:], promptInt64("ExpiryTime"))
|
|
req = a.request(append([]byte{0x0c}, arg...))
|
|
case "13":
|
|
arg := make([]byte, 40)
|
|
copy(arg, promptUID())
|
|
copy(arg[32:], promptInt64("UpCredit to add"))
|
|
req = a.request(append([]byte{0x0d}, arg...))
|
|
case "14":
|
|
arg := make([]byte, 40)
|
|
copy(arg, promptUID())
|
|
copy(arg[32:], promptInt64("DownCredit to add"))
|
|
req = a.request(append([]byte{0x0e}, arg...))
|
|
default:
|
|
return nil, errors.New("Unreconised cmd")
|
|
}
|
|
return req, nil
|
|
}
|
|
|
|
// protocol: 0[TLS record layer 5 bytes]5[IV 16 bytes]21[data][hmac 32 bytes]
|
|
func (a *administrator) request(data []byte) []byte {
|
|
dataLen := len(data)
|
|
|
|
buf := make([]byte, 5+16+dataLen+32)
|
|
buf[0] = 0x17
|
|
buf[1] = 0x03
|
|
buf[2] = 0x03
|
|
binary.BigEndian.PutUint16(buf[3:5], uint16(16+dataLen+32))
|
|
|
|
rand.Read(buf[5:21]) //iv
|
|
copy(buf[21:], data)
|
|
block, _ := aes.NewCipher(a.adminUID[0:16])
|
|
stream := cipher.NewCTR(block, buf[5:21])
|
|
stream.XORKeyStream(buf[21:21+dataLen], buf[21:21+dataLen])
|
|
|
|
mac := hmac.New(sha256.New, a.adminUID[16:32])
|
|
mac.Write(buf[5 : 21+dataLen])
|
|
copy(buf[21+dataLen:], mac.Sum(nil))
|
|
|
|
return buf
|
|
}
|
|
|
|
var ErrInvalidMac = errors.New("Mac mismatch")
|
|
|
|
func (a *administrator) checkAndDecrypt(data []byte) ([]byte, error) {
|
|
macIndex := len(data) - 32
|
|
mac := hmac.New(sha256.New, a.adminUID[16:32])
|
|
mac.Write(data[5:macIndex])
|
|
expected := mac.Sum(nil)
|
|
if !hmac.Equal(data[macIndex:], expected) {
|
|
return nil, ErrInvalidMac
|
|
}
|
|
|
|
iv := data[5:21]
|
|
ret := data[21:macIndex]
|
|
block, _ := aes.NewCipher(a.adminUID[0:16])
|
|
stream := cipher.NewCTR(block, iv)
|
|
stream.XORKeyStream(ret, ret)
|
|
return ret, nil
|
|
}
|