package client import ( "crypto" "encoding/base64" "encoding/json" "errors" "io/ioutil" "strings" "time" "github.com/cbeuw/Cloak/internal/ecdh" ) type rawConfig struct { ServerName string ProxyMethod string EncryptionMethod string UID string PublicKey string BrowserSig string NumConn int } // State stores global variables type State struct { LocalHost string LocalPort string RemoteHost string RemotePort string Now func() time.Time SessionID uint32 UID []byte staticPub crypto.PublicKey IsAdmin bool Browser Browser ProxyMethod string EncryptionMethod byte ServerName string NumConn int } func InitState(localHost, localPort, remoteHost, remotePort string, nowFunc func() time.Time) *State { ret := &State{ LocalHost: localHost, LocalPort: localPort, RemoteHost: remoteHost, RemotePort: remotePort, Now: nowFunc, } return ret } // semi-colon separated value. This is for Android plugin options func ssvToJson(ssv string) (ret []byte) { unescape := func(s string) string { r := strings.Replace(s, `\\`, `\`, -1) r = strings.Replace(r, `\=`, `=`, -1) r = strings.Replace(r, `\;`, `;`, -1) return r } lines := strings.Split(unescape(ssv), ";") ret = []byte("{") for _, ln := range lines { if ln == "" { break } sp := strings.SplitN(ln, "=", 2) key := sp[0] value := sp[1] // JSON doesn't like quotation marks around int // Yes this is extremely ugly but it's still better than writing a tokeniser if key == "NumConn" { ret = append(ret, []byte(`"`+key+`":`+value+`,`)...) } else { ret = append(ret, []byte(`"`+key+`":"`+value+`",`)...) } } ret = ret[:len(ret)-1] // remove the last comma ret = append(ret, '}') return ret } // ParseConfig parses the config (either a path to json or Android config) into a State variable func (sta *State) ParseConfig(conf string) (err error) { var content []byte if strings.Contains(conf, ";") && strings.Contains(conf, "=") { content = ssvToJson(conf) } else { content, err = ioutil.ReadFile(conf) if err != nil { return err } } var preParse rawConfig err = json.Unmarshal(content, &preParse) if err != nil { return err } switch strings.ToLower(preParse.EncryptionMethod) { case "plain": sta.EncryptionMethod = 0x00 case "aes-gcm": sta.EncryptionMethod = 0x01 case "chacha20-poly1305": sta.EncryptionMethod = 0x02 default: return errors.New("Unknown encryption method") } switch strings.ToLower(preParse.BrowserSig) { case "chrome": sta.Browser = &Chrome{} case "firefox": sta.Browser = &Firefox{} default: return errors.New("unsupported browser signature") } sta.ProxyMethod = preParse.ProxyMethod sta.ServerName = preParse.ServerName sta.NumConn = preParse.NumConn uid, err := base64.StdEncoding.DecodeString(preParse.UID) if err != nil { return errors.New("Failed to parse UID: " + err.Error()) } sta.UID = uid pubBytes, err := base64.StdEncoding.DecodeString(preParse.PublicKey) if err != nil { return errors.New("Failed to parse Public key: " + err.Error()) } pub, ok := ecdh.Unmarshal(pubBytes) if !ok { return errors.New("Failed to unmarshal Public key") } sta.staticPub = pub return nil }