mirror of
https://github.com/xvzc/SpoofDPI.git
synced 2024-12-22 22:36:53 +00:00
133 lines
3.4 KiB
Go
133 lines
3.4 KiB
Go
package proxy
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import (
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"net"
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"strconv"
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log "github.com/sirupsen/logrus"
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"github.com/xvzc/SpoofDPI/packet"
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)
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func (pxy *Proxy) handleHttps(lConn *net.TCPConn, initPkt *packet.HttpPacket, ip string) {
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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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log.Debug("[HTTPS] Error while parsing port for ", initPkt.Domain(), " aborting..")
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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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log.Debug("[HTTPS] ", err)
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return
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}
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defer func() {
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lConn.Close()
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log.Debug("[HTTPS] Closing client Connection.. ", lConn.RemoteAddr())
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rConn.Close()
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log.Debug("[HTTPS] Closing server Connection.. ", initPkt.Domain(), " ", rConn.LocalAddr())
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}()
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log.Debug("[HTTPS] New connection to the server ", initPkt.Domain(), " ", rConn.LocalAddr())
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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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log.Debug("[HTTPS] Error sending 200 Connection Established to the client", err)
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return
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}
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log.Debug("[HTTPS] Sent 200 Connection Estabalished to ", lConn.RemoteAddr())
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// Read client hello
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clientHello, err := ReadBytes(lConn)
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if err != nil {
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log.Debug("[HTTPS] Error reading client hello from the client", err)
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return
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}
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log.Debug("[HTTPS] Client sent hello ", len(clientHello), "bytes")
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// Generate a go routine that reads from the server
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chPkt := packet.NewHttpsPacket(clientHello)
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// lConn.SetLinger(3)
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// rConn.SetLinger(3)
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go Serve(rConn, lConn, "[HTTPS]", rConn.RemoteAddr().String(), initPkt.Domain(), pxy.timeout)
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if pxy.patternExists() && !pxy.patternMatches([]byte(initPkt.Domain())) {
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log.Debug("[HTTPS] Writing plain client hello to ", initPkt.Domain())
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if _, err := rConn.Write(chPkt.Raw()); err != nil {
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log.Debug("[HTTPS] Error writing plain client hello to ", initPkt.Domain(), err)
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return
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}
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} else {
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log.Debug("[HTTPS] Writing chunked client hello to ", initPkt.Domain())
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chunks := pxy.splitInChunks(chPkt.Raw())
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if _, err := WriteChunks(rConn, chunks); err != nil {
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log.Debug("[HTTPS] Error writing chunked client hello to ", initPkt.Domain(), err)
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return
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}
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}
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Serve(lConn, rConn, "[HTTPS]", lConn.RemoteAddr().String(), initPkt.Domain(), pxy.timeout)
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}
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func (pxy *Proxy) splitInChunks(bytes []byte) [][]byte {
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// If the packet matches the pattern or the URLs, we don't split it
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if pxy.patternExists() && !pxy.patternMatches(bytes) {
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return [][]byte{bytes}
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}
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var chunks [][]byte
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var raw []byte = bytes
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var size = pxy.windowSize
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log.Debug("[HTTPS] window-size: ", 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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log.Debug("[HTTPS] Using legacy fragmentation.")
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return [][]byte{raw[:1], raw[1:]}
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}
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func (pxy *Proxy) patternExists() bool {
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return pxy.allowedPattern != nil || pxy.allowedUrls != nil
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}
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func (pxy *Proxy) patternMatches(bytes []byte) bool {
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return (pxy.allowedPattern != nil && pxy.allowedPattern.Match(bytes)) ||
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(pxy.allowedUrls != nil && pxy.allowedUrls.Match(bytes))
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}
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