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decrypt in place

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This commit is contained in:
JackDoan
2026-07-15 09:16:40 -05:00
parent c6ebe71c08
commit ef0e3015f9
16 changed files with 183 additions and 263 deletions
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inside.go
+10 -7
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@@ -279,27 +279,30 @@ func (f *Interface) rejectInside(packet []byte, out []byte, q int) {
}
}
func (f *Interface) rejectOutside(packet []byte, ci *ConnectionState, hostinfo *HostInfo, nb, out []byte, q int) {
func (f *Interface) rejectOutside(packet []byte, ci *ConnectionState, hostinfo *HostInfo, nb, rejectBuf []byte, q int) {
if !f.firewall.InboundSendReject {
return
}
out = iputil.CreateRejectPacket(packet, out)
// split rejectBuf to make sure we have room to write the plaintext rejection, then encrypt it, without trampling anything
// we can't re-use packet, if we need to send an icmp reject, it won't be long enough.
half := len(rejectBuf) / 2
encryptBuf := rejectBuf[0:0:half] //the first half of rejectBuf's capacity, len set to 0
buildBuf := rejectBuf[half:]
out := iputil.CreateRejectPacket(packet, buildBuf)
if len(out) == 0 {
return
}
if len(out) > iputil.MaxRejectPacketSize {
if f.l.Enabled(context.Background(), slog.LevelInfo) {
f.l.Info("rejectOutside: packet too big, not sending",
"packet", packet,
"outPacket", out,
)
f.l.Info("rejectOutside: packet too big, not sending", "packet", packet, "outPacket", out)
}
return
}
f.sendNoMetrics(header.Message, 0, ci, hostinfo, netip.AddrPort{}, out, nb, packet, q)
f.sendNoMetrics(header.Message, 0, ci, hostinfo, netip.AddrPort{}, out, nb, encryptBuf, q)
}
// Handshake will attempt to initiate a tunnel with the provided vpn address. This is a no-op if the tunnel is already established or being established