mirror of
https://github.com/xvzc/SpoofDPI.git
synced 2024-12-22 14:26:31 +00:00
128 lines
3.1 KiB
Go
128 lines
3.1 KiB
Go
package proxy
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import (
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"context"
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"github.com/xvzc/SpoofDPI/util"
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"net"
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"strconv"
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"github.com/xvzc/SpoofDPI/packet"
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"github.com/xvzc/SpoofDPI/util/log"
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)
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const protoHTTPS = "HTTPS"
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func (pxy *Proxy) handleHttps(ctx context.Context, lConn *net.TCPConn, exploit bool, initPkt *packet.HttpRequest, ip string) {
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ctx = util.GetCtxWithScope(ctx, protoHTTPS)
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logger := log.GetCtxLogger(ctx)
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// Create a connection to the requested server
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var port int = 443
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var err error
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if initPkt.Port() != "" {
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port, err = strconv.Atoi(initPkt.Port())
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if err != nil {
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logger.Debug().Msgf("error parsing port for %s aborting..", initPkt.Domain())
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}
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}
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rConn, err := net.DialTCP("tcp", nil, &net.TCPAddr{IP: net.ParseIP(ip), Port: port})
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if err != nil {
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lConn.Close()
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logger.Debug().Msgf("%s", err)
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return
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}
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logger.Debug().Msgf("new connection to the server %s -> %s", rConn.LocalAddr(), initPkt.Domain())
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_, err = lConn.Write([]byte(initPkt.Version() + " 200 Connection Established\r\n\r\n"))
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if err != nil {
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logger.Debug().Msgf("error sending 200 connection established to the client: %s", err)
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return
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}
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logger.Debug().Msgf("sent connection estabalished to %s", lConn.RemoteAddr())
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// Read client hello
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m, err := packet.ReadTLSMessage(lConn)
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if err != nil || !m.IsClientHello() {
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logger.Debug().Msgf("error reading client hello from %s: %s", lConn.RemoteAddr().String(), err)
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return
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}
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clientHello := m.Raw
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logger.Debug().Msgf("client sent hello %d bytes", len(clientHello))
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// Generate a go routine that reads from the server
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go Serve(ctx, rConn, lConn, protoHTTPS, initPkt.Domain(), lConn.RemoteAddr().String(), pxy.timeout)
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if exploit {
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logger.Debug().Msgf("writing chunked client hello to %s", initPkt.Domain())
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chunks := splitInChunks(ctx, clientHello, pxy.windowSize)
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if _, err := writeChunks(rConn, chunks); err != nil {
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logger.Debug().Msgf("error writing chunked client hello to %s: %s", initPkt.Domain(), err)
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return
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}
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} else {
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logger.Debug().Msgf("writing plain client hello to %s", initPkt.Domain())
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if _, err := rConn.Write(clientHello); err != nil {
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logger.Debug().Msgf("error writing plain client hello to %s: %s", initPkt.Domain(), err)
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return
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}
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}
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go Serve(ctx, lConn, rConn, protoHTTPS, lConn.RemoteAddr().String(), initPkt.Domain(), pxy.timeout)
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}
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func splitInChunks(ctx context.Context, bytes []byte, size int) [][]byte {
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logger := log.GetCtxLogger(ctx)
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var chunks [][]byte
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var raw []byte = bytes
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logger.Debug().Msgf("window-size: %d", size)
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if size > 0 {
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for {
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if len(raw) == 0 {
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break
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}
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// necessary check to avoid slicing beyond
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// slice capacity
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if len(raw) < size {
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size = len(raw)
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}
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chunks = append(chunks, raw[0:size])
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raw = raw[size:]
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}
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return chunks
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}
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// When the given window-size <= 0
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if len(raw) < 1 {
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return [][]byte{raw}
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}
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logger.Debug().Msg("using legacy fragmentation")
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return [][]byte{raw[:1], raw[1:]}
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}
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func writeChunks(conn *net.TCPConn, c [][]byte) (n int, err error) {
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total := 0
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for i := 0; i < len(c); i++ {
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b, err := conn.Write(c[i])
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if err != nil {
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return 0, nil
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}
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total += b
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}
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return total, nil
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}
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