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49 lines
1.0 KiB
Go
49 lines
1.0 KiB
Go
package client
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import (
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"encoding/base64"
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"errors"
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"fmt"
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"github.com/cbeuw/Cloak/internal/util"
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"github.com/gorilla/websocket"
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"net"
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"net/http"
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"net/url"
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)
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type WebSocket struct {
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Transport
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}
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func (WebSocket) PrepareConnection(sta *State, conn net.Conn) (sessionKey []byte, err error) {
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u, err := url.Parse("ws://" + sta.RemoteHost + ":" + sta.RemotePort) //TODO IPv6
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if err != nil {
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return nil, fmt.Errorf("failed to parse ws url: %v")
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}
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hd, sharedSecret := makeHiddenData(sta)
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header := http.Header{}
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header.Add("hidden", base64.StdEncoding.EncodeToString(hd.fullRaw))
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c, _, err := websocket.NewClient(conn, u, header, 16480, 16480)
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if err != nil {
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return nil, fmt.Errorf("failed to handshake: %v", err)
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}
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conn = &util.WebSocketConn{c}
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buf := make([]byte, 128)
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n, err := conn.Read(buf)
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if err != nil {
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return nil, fmt.Errorf("failed to read reply: %v", err)
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}
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if n != 60 {
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return nil, errors.New("reply must be 60 bytes")
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}
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reply := buf[:60]
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sessionKey, err = util.AESGCMDecrypt(reply[:12], sharedSecret, reply[12:])
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return
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}
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