/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2026 WireGuard LLC. All Rights Reserved.
*/
package firewall
import (
"encoding/binary"
"errors"
"net/netip"
"runtime"
"unsafe"
"golang.org/x/sys/windows"
)
// Known addresses.
var (
linkLocal = wtFwpV6AddrAndMask{[16]uint8{0xfe, 0x80}, 10}
linkLocalDHCPMulticast = wtFwpByteArray16{[16]uint8{0xFF, 0x02, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x2}}
siteLocalDHCPMulticast = wtFwpByteArray16{[16]uint8{0xFF, 0x05, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x3}}
linkLocalRouterMulticast = wtFwpByteArray16{[16]uint8{0xFF, 0x02, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2}}
)
func permitTunInterface(session uintptr, baseObjects *baseObjects, weight uint8, ifLUID uint64) error {
ifaceCondition := wtFwpmFilterCondition0{
fieldKey: cFWPM_CONDITION_IP_LOCAL_INTERFACE,
matchType: cFWP_MATCH_EQUAL,
conditionValue: wtFwpConditionValue0{
_type: cFWP_UINT64,
value: (uintptr)(unsafe.Pointer(&ifLUID)),
},
}
filter := wtFwpmFilter0{
providerKey: &baseObjects.provider,
subLayerKey: baseObjects.filters,
weight: filterWeight(weight),
numFilterConditions: 1,
filterCondition: (*wtFwpmFilterCondition0)(unsafe.Pointer(&ifaceCondition)),
action: wtFwpmAction0{
_type: cFWP_ACTION_PERMIT,
},
}
filterID := uint64(0)
//
// #1 Permit outbound IPv4 traffic.
//
{
displayData, err := createWtFwpmDisplayData0("Permit outbound IPv4 traffic on TUN", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #2 Permit inbound IPv4 traffic.
//
{
displayData, err := createWtFwpmDisplayData0("Permit inbound IPv4 traffic on TUN", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #3 Permit outbound IPv6 traffic.
//
{
displayData, err := createWtFwpmDisplayData0("Permit outbound IPv6 traffic on TUN", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #4 Permit inbound IPv6 traffic.
//
{
displayData, err := createWtFwpmDisplayData0("Permit inbound IPv6 traffic on TUN", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
runtime.KeepAlive(ifLUID)
return nil
}
func permitPhobosService(session uintptr, baseObjects *baseObjects, weight uint8) error {
var conditions [2]wtFwpmFilterCondition0
//
// First condition is the exe path of the current process.
//
appID, err := getCurrentProcessAppID()
if err != nil {
return wrapErr(err)
}
defer fwpmFreeMemory0(unsafe.Pointer(&appID))
conditions[0] = wtFwpmFilterCondition0{
fieldKey: cFWPM_CONDITION_ALE_APP_ID,
matchType: cFWP_MATCH_EQUAL,
conditionValue: wtFwpConditionValue0{
_type: cFWP_BYTE_BLOB_TYPE,
value: uintptr(unsafe.Pointer(appID)),
},
}
//
// Second condition is the SECURITY_DESCRIPTOR of the current process.
// This prevents other processes hosted in the same exe from matching this filter.
//
sd, err := getCurrentProcessSecurityDescriptor()
if err != nil {
return wrapErr(err)
}
sdBlob := wtFwpByteBlob{sd.Length(), (*byte)(unsafe.Pointer(sd))}
conditions[1] = wtFwpmFilterCondition0{
fieldKey: cFWPM_CONDITION_ALE_USER_ID,
matchType: cFWP_MATCH_EQUAL,
conditionValue: wtFwpConditionValue0{
_type: cFWP_SECURITY_DESCRIPTOR_TYPE,
value: uintptr(unsafe.Pointer(&sdBlob)),
},
}
//
// Assemble the filter.
//
filter := wtFwpmFilter0{
providerKey: &baseObjects.provider,
subLayerKey: baseObjects.filters,
weight: filterWeight(weight),
flags: cFWPM_FILTER_FLAG_CLEAR_ACTION_RIGHT,
numFilterConditions: uint32(len(conditions)),
filterCondition: (*wtFwpmFilterCondition0)(unsafe.Pointer(&conditions)),
action: wtFwpmAction0{
_type: cFWP_ACTION_PERMIT,
},
}
filterID := uint64(0)
//
// #1 Permit outbound IPv4 traffic.
//
{
displayData, err := createWtFwpmDisplayData0("Permit unrestricted outbound traffic for Phobos service (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #2 Permit inbound IPv4 traffic.
//
{
displayData, err := createWtFwpmDisplayData0("Permit unrestricted inbound traffic for Phobos service (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #3 Permit outbound IPv6 traffic.
//
{
displayData, err := createWtFwpmDisplayData0("Permit unrestricted outbound traffic for Phobos service (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #4 Permit inbound IPv6 traffic.
//
{
displayData, err := createWtFwpmDisplayData0("Permit unrestricted inbound traffic for Phobos service (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
runtime.KeepAlive(sdBlob)
runtime.KeepAlive(sd)
return nil
}
func permitLoopback(session uintptr, baseObjects *baseObjects, weight uint8) error {
condition := wtFwpmFilterCondition0{
fieldKey: cFWPM_CONDITION_FLAGS,
matchType: cFWP_MATCH_FLAGS_ALL_SET,
conditionValue: wtFwpConditionValue0{
_type: cFWP_UINT32,
value: uintptr(cFWP_CONDITION_FLAG_IS_LOOPBACK),
},
}
filter := wtFwpmFilter0{
providerKey: &baseObjects.provider,
subLayerKey: baseObjects.filters,
weight: filterWeight(weight),
numFilterConditions: 1,
filterCondition: (*wtFwpmFilterCondition0)(unsafe.Pointer(&condition)),
action: wtFwpmAction0{
_type: cFWP_ACTION_PERMIT,
},
}
filterID := uint64(0)
//
// #1 Permit outbound IPv4 on loopback.
//
{
displayData, err := createWtFwpmDisplayData0("Permit outbound on loopback (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #2 Permit inbound IPv4 on loopback.
//
{
displayData, err := createWtFwpmDisplayData0("Permit inbound on loopback (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #3 Permit outbound IPv6 on loopback.
//
{
displayData, err := createWtFwpmDisplayData0("Permit outbound on loopback (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #4 Permit inbound IPv6 on loopback.
//
{
displayData, err := createWtFwpmDisplayData0("Permit inbound on loopback (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
return nil
}
func permitDHCPIPv4(session uintptr, baseObjects *baseObjects, weight uint8) error {
//
// #1 Outbound DHCP request on IPv4.
//
{
var conditions [4]wtFwpmFilterCondition0
conditions[0].fieldKey = cFWPM_CONDITION_IP_PROTOCOL
conditions[0].matchType = cFWP_MATCH_EQUAL
conditions[0].conditionValue._type = cFWP_UINT8
conditions[0].conditionValue.value = uintptr(cIPPROTO_UDP)
conditions[1].fieldKey = cFWPM_CONDITION_IP_LOCAL_PORT
conditions[1].matchType = cFWP_MATCH_EQUAL
conditions[1].conditionValue._type = cFWP_UINT16
conditions[1].conditionValue.value = uintptr(68)
conditions[2].fieldKey = cFWPM_CONDITION_IP_REMOTE_PORT
conditions[2].matchType = cFWP_MATCH_EQUAL
conditions[2].conditionValue._type = cFWP_UINT16
conditions[2].conditionValue.value = uintptr(67)
conditions[3].fieldKey = cFWPM_CONDITION_IP_REMOTE_ADDRESS
conditions[3].matchType = cFWP_MATCH_EQUAL
conditions[3].conditionValue._type = cFWP_UINT32
conditions[3].conditionValue.value = uintptr(0xffffffff)
displayData, err := createWtFwpmDisplayData0("Permit outbound DHCP request (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter := wtFwpmFilter0{
displayData: *displayData,
providerKey: &baseObjects.provider,
layerKey: cFWPM_LAYER_ALE_AUTH_CONNECT_V4,
subLayerKey: baseObjects.filters,
weight: filterWeight(weight),
numFilterConditions: uint32(len(conditions)),
filterCondition: (*wtFwpmFilterCondition0)(unsafe.Pointer(&conditions)),
action: wtFwpmAction0{
_type: cFWP_ACTION_PERMIT,
},
}
filterID := uint64(0)
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #2 Inbound DHCP response on IPv4.
//
{
var conditions [3]wtFwpmFilterCondition0
conditions[0].fieldKey = cFWPM_CONDITION_IP_PROTOCOL
conditions[0].matchType = cFWP_MATCH_EQUAL
conditions[0].conditionValue._type = cFWP_UINT8
conditions[0].conditionValue.value = uintptr(cIPPROTO_UDP)
conditions[1].fieldKey = cFWPM_CONDITION_IP_LOCAL_PORT
conditions[1].matchType = cFWP_MATCH_EQUAL
conditions[1].conditionValue._type = cFWP_UINT16
conditions[1].conditionValue.value = uintptr(68)
conditions[2].fieldKey = cFWPM_CONDITION_IP_REMOTE_PORT
conditions[2].matchType = cFWP_MATCH_EQUAL
conditions[2].conditionValue._type = cFWP_UINT16
conditions[2].conditionValue.value = uintptr(67)
displayData, err := createWtFwpmDisplayData0("Permit inbound DHCP response (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter := wtFwpmFilter0{
displayData: *displayData,
providerKey: &baseObjects.provider,
layerKey: cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4,
subLayerKey: baseObjects.filters,
weight: filterWeight(weight),
numFilterConditions: uint32(len(conditions)),
filterCondition: (*wtFwpmFilterCondition0)(unsafe.Pointer(&conditions)),
action: wtFwpmAction0{
_type: cFWP_ACTION_PERMIT,
},
}
filterID := uint64(0)
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
return nil
}
func permitDHCPIPv6(session uintptr, baseObjects *baseObjects, weight uint8) error {
//
// #1 Outbound DHCP request on IPv6.
//
{
var conditions [6]wtFwpmFilterCondition0
conditions[0].fieldKey = cFWPM_CONDITION_IP_PROTOCOL
conditions[0].matchType = cFWP_MATCH_EQUAL
conditions[0].conditionValue._type = cFWP_UINT8
conditions[0].conditionValue.value = uintptr(cIPPROTO_UDP)
conditions[1].fieldKey = cFWPM_CONDITION_IP_REMOTE_ADDRESS
conditions[1].matchType = cFWP_MATCH_EQUAL
conditions[1].conditionValue._type = cFWP_BYTE_ARRAY16_TYPE
conditions[1].conditionValue.value = uintptr(unsafe.Pointer(&linkLocalDHCPMulticast))
// Repeat the condition type for logical OR.
conditions[2].fieldKey = cFWPM_CONDITION_IP_REMOTE_ADDRESS
conditions[2].matchType = cFWP_MATCH_EQUAL
conditions[2].conditionValue._type = cFWP_BYTE_ARRAY16_TYPE
conditions[2].conditionValue.value = uintptr(unsafe.Pointer(&siteLocalDHCPMulticast))
conditions[3].fieldKey = cFWPM_CONDITION_IP_REMOTE_PORT
conditions[3].matchType = cFWP_MATCH_EQUAL
conditions[3].conditionValue._type = cFWP_UINT16
conditions[3].conditionValue.value = uintptr(547)
conditions[4].fieldKey = cFWPM_CONDITION_IP_LOCAL_ADDRESS
conditions[4].matchType = cFWP_MATCH_EQUAL
conditions[4].conditionValue._type = cFWP_V6_ADDR_MASK
conditions[4].conditionValue.value = uintptr(unsafe.Pointer(&linkLocal))
conditions[5].fieldKey = cFWPM_CONDITION_IP_LOCAL_PORT
conditions[5].matchType = cFWP_MATCH_EQUAL
conditions[5].conditionValue._type = cFWP_UINT16
conditions[5].conditionValue.value = uintptr(546)
displayData, err := createWtFwpmDisplayData0("Permit outbound DHCP request (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter := wtFwpmFilter0{
displayData: *displayData,
providerKey: &baseObjects.provider,
layerKey: cFWPM_LAYER_ALE_AUTH_CONNECT_V6,
subLayerKey: baseObjects.filters,
weight: filterWeight(weight),
numFilterConditions: uint32(len(conditions)),
filterCondition: (*wtFwpmFilterCondition0)(unsafe.Pointer(&conditions)),
action: wtFwpmAction0{
_type: cFWP_ACTION_PERMIT,
},
}
filterID := uint64(0)
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #2 Inbound DHCP response on IPv6.
//
{
var conditions [5]wtFwpmFilterCondition0
conditions[0].fieldKey = cFWPM_CONDITION_IP_PROTOCOL
conditions[0].matchType = cFWP_MATCH_EQUAL
conditions[0].conditionValue._type = cFWP_UINT8
conditions[0].conditionValue.value = uintptr(cIPPROTO_UDP)
conditions[1].fieldKey = cFWPM_CONDITION_IP_REMOTE_ADDRESS
conditions[1].matchType = cFWP_MATCH_EQUAL
conditions[1].conditionValue._type = cFWP_V6_ADDR_MASK
conditions[1].conditionValue.value = uintptr(unsafe.Pointer(&linkLocal))
conditions[2].fieldKey = cFWPM_CONDITION_IP_REMOTE_PORT
conditions[2].matchType = cFWP_MATCH_EQUAL
conditions[2].conditionValue._type = cFWP_UINT16
conditions[2].conditionValue.value = uintptr(547)
conditions[3].fieldKey = cFWPM_CONDITION_IP_LOCAL_ADDRESS
conditions[3].matchType = cFWP_MATCH_EQUAL
conditions[3].conditionValue._type = cFWP_V6_ADDR_MASK
conditions[3].conditionValue.value = uintptr(unsafe.Pointer(&linkLocal))
conditions[4].fieldKey = cFWPM_CONDITION_IP_LOCAL_PORT
conditions[4].matchType = cFWP_MATCH_EQUAL
conditions[4].conditionValue._type = cFWP_UINT16
conditions[4].conditionValue.value = uintptr(546)
displayData, err := createWtFwpmDisplayData0("Permit inbound DHCP response (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter := wtFwpmFilter0{
displayData: *displayData,
providerKey: &baseObjects.provider,
layerKey: cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6,
subLayerKey: baseObjects.filters,
weight: filterWeight(weight),
numFilterConditions: uint32(len(conditions)),
filterCondition: (*wtFwpmFilterCondition0)(unsafe.Pointer(&conditions)),
action: wtFwpmAction0{
_type: cFWP_ACTION_PERMIT,
},
}
filterID := uint64(0)
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
return nil
}
func permitNdp(session uintptr, baseObjects *baseObjects, weight uint8) error {
/* TODO: actually handle the hop limit somehow! The rules should vaguely be:
* - icmpv6 133: must be outgoing, dst must be FF02::2/128, hop limit must be 255
* - icmpv6 134: must be incoming, src must be FE80::/10, hop limit must be 255
* - icmpv6 135: either incoming or outgoing, hop limit must be 255
* - icmpv6 136: either incoming or outgoing, hop limit must be 255
* - icmpv6 137: must be incoming, src must be FE80::/10, hop limit must be 255
*/
type filterDefinition struct {
displayData *wtFwpmDisplayData0
conditions []wtFwpmFilterCondition0
layer windows.GUID
}
var defs []filterDefinition
//
// Router Solicitation Message
// ICMP type 133, code 0. Outgoing.
//
{
conditions := make([]wtFwpmFilterCondition0, 4)
conditions[0].fieldKey = cFWPM_CONDITION_IP_PROTOCOL
conditions[0].matchType = cFWP_MATCH_EQUAL
conditions[0].conditionValue._type = cFWP_UINT8
conditions[0].conditionValue.value = uintptr(cIPPROTO_ICMPV6)
conditions[1].fieldKey = cFWPM_CONDITION_ICMP_TYPE
conditions[1].matchType = cFWP_MATCH_EQUAL
conditions[1].conditionValue._type = cFWP_UINT16
conditions[1].conditionValue.value = uintptr(133)
conditions[2].fieldKey = cFWPM_CONDITION_ICMP_CODE
conditions[2].matchType = cFWP_MATCH_EQUAL
conditions[2].conditionValue._type = cFWP_UINT16
conditions[2].conditionValue.value = uintptr(0)
conditions[3].fieldKey = cFWPM_CONDITION_IP_REMOTE_ADDRESS
conditions[3].matchType = cFWP_MATCH_EQUAL
conditions[3].conditionValue._type = cFWP_BYTE_ARRAY16_TYPE
conditions[3].conditionValue.value = uintptr(unsafe.Pointer(&linkLocalRouterMulticast))
displayData, err := createWtFwpmDisplayData0("Permit NDP type 133", "")
if err != nil {
return wrapErr(err)
}
defs = append(defs, filterDefinition{
displayData: displayData,
conditions: conditions,
layer: cFWPM_LAYER_ALE_AUTH_CONNECT_V6,
})
}
//
// Router Advertisement Message
// ICMP type 134, code 0. Incoming.
//
{
conditions := make([]wtFwpmFilterCondition0, 4)
conditions[0].fieldKey = cFWPM_CONDITION_IP_PROTOCOL
conditions[0].matchType = cFWP_MATCH_EQUAL
conditions[0].conditionValue._type = cFWP_UINT8
conditions[0].conditionValue.value = uintptr(cIPPROTO_ICMPV6)
conditions[1].fieldKey = cFWPM_CONDITION_ICMP_TYPE
conditions[1].matchType = cFWP_MATCH_EQUAL
conditions[1].conditionValue._type = cFWP_UINT16
conditions[1].conditionValue.value = uintptr(134)
conditions[2].fieldKey = cFWPM_CONDITION_ICMP_CODE
conditions[2].matchType = cFWP_MATCH_EQUAL
conditions[2].conditionValue._type = cFWP_UINT16
conditions[2].conditionValue.value = uintptr(0)
conditions[3].fieldKey = cFWPM_CONDITION_IP_REMOTE_ADDRESS
conditions[3].matchType = cFWP_MATCH_EQUAL
conditions[3].conditionValue._type = cFWP_V6_ADDR_MASK
conditions[3].conditionValue.value = uintptr(unsafe.Pointer(&linkLocal))
displayData, err := createWtFwpmDisplayData0("Permit NDP type 134", "")
if err != nil {
return wrapErr(err)
}
defs = append(defs, filterDefinition{
displayData: displayData,
conditions: conditions,
layer: cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6,
})
}
//
// Neighbor Solicitation Message
// ICMP type 135, code 0. Bi-directional.
//
{
conditions := make([]wtFwpmFilterCondition0, 3)
conditions[0].fieldKey = cFWPM_CONDITION_IP_PROTOCOL
conditions[0].matchType = cFWP_MATCH_EQUAL
conditions[0].conditionValue._type = cFWP_UINT8
conditions[0].conditionValue.value = uintptr(cIPPROTO_ICMPV6)
conditions[1].fieldKey = cFWPM_CONDITION_ICMP_TYPE
conditions[1].matchType = cFWP_MATCH_EQUAL
conditions[1].conditionValue._type = cFWP_UINT16
conditions[1].conditionValue.value = uintptr(135)
conditions[2].fieldKey = cFWPM_CONDITION_ICMP_CODE
conditions[2].matchType = cFWP_MATCH_EQUAL
conditions[2].conditionValue._type = cFWP_UINT16
conditions[2].conditionValue.value = uintptr(0)
displayData, err := createWtFwpmDisplayData0("Permit NDP type 135", "")
if err != nil {
return wrapErr(err)
}
defs = append(defs, filterDefinition{
displayData: displayData,
conditions: conditions,
layer: cFWPM_LAYER_ALE_AUTH_CONNECT_V6,
})
defs = append(defs, filterDefinition{
displayData: displayData,
conditions: conditions,
layer: cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6,
})
}
//
// Neighbor Advertisement Message
// ICMP type 136, code 0. Bi-directional.
//
{
conditions := make([]wtFwpmFilterCondition0, 3)
conditions[0].fieldKey = cFWPM_CONDITION_IP_PROTOCOL
conditions[0].matchType = cFWP_MATCH_EQUAL
conditions[0].conditionValue._type = cFWP_UINT8
conditions[0].conditionValue.value = uintptr(cIPPROTO_ICMPV6)
conditions[1].fieldKey = cFWPM_CONDITION_ICMP_TYPE
conditions[1].matchType = cFWP_MATCH_EQUAL
conditions[1].conditionValue._type = cFWP_UINT16
conditions[1].conditionValue.value = uintptr(136)
conditions[2].fieldKey = cFWPM_CONDITION_ICMP_CODE
conditions[2].matchType = cFWP_MATCH_EQUAL
conditions[2].conditionValue._type = cFWP_UINT16
conditions[2].conditionValue.value = uintptr(0)
displayData, err := createWtFwpmDisplayData0("Permit NDP type 136", "")
if err != nil {
return wrapErr(err)
}
defs = append(defs, filterDefinition{
displayData: displayData,
conditions: conditions,
layer: cFWPM_LAYER_ALE_AUTH_CONNECT_V6,
})
defs = append(defs, filterDefinition{
displayData: displayData,
conditions: conditions,
layer: cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6,
})
}
//
// Redirect Message
// ICMP type 137, code 0. Incoming.
//
{
conditions := make([]wtFwpmFilterCondition0, 4)
conditions[0].fieldKey = cFWPM_CONDITION_IP_PROTOCOL
conditions[0].matchType = cFWP_MATCH_EQUAL
conditions[0].conditionValue._type = cFWP_UINT8
conditions[0].conditionValue.value = uintptr(cIPPROTO_ICMPV6)
conditions[1].fieldKey = cFWPM_CONDITION_ICMP_TYPE
conditions[1].matchType = cFWP_MATCH_EQUAL
conditions[1].conditionValue._type = cFWP_UINT16
conditions[1].conditionValue.value = uintptr(137)
conditions[2].fieldKey = cFWPM_CONDITION_ICMP_CODE
conditions[2].matchType = cFWP_MATCH_EQUAL
conditions[2].conditionValue._type = cFWP_UINT16
conditions[2].conditionValue.value = uintptr(0)
conditions[3].fieldKey = cFWPM_CONDITION_IP_REMOTE_ADDRESS
conditions[3].matchType = cFWP_MATCH_EQUAL
conditions[3].conditionValue._type = cFWP_V6_ADDR_MASK
conditions[3].conditionValue.value = uintptr(unsafe.Pointer(&linkLocal))
displayData, err := createWtFwpmDisplayData0("Permit NDP type 137", "")
if err != nil {
return wrapErr(err)
}
defs = append(defs, filterDefinition{
displayData: displayData,
conditions: conditions,
layer: cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6,
})
}
filter := wtFwpmFilter0{
providerKey: &baseObjects.provider,
subLayerKey: baseObjects.filters,
weight: filterWeight(weight),
action: wtFwpmAction0{
_type: cFWP_ACTION_PERMIT,
},
}
filterID := uint64(0)
for _, definition := range defs {
filter.displayData = *definition.displayData
filter.layerKey = definition.layer
filter.numFilterConditions = uint32(len(definition.conditions))
filter.filterCondition = (*wtFwpmFilterCondition0)(unsafe.Pointer(&definition.conditions[0]))
err := fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
return nil
}
func permitHyperV(session uintptr, baseObjects *baseObjects, weight uint8) error {
condition := wtFwpmFilterCondition0{
fieldKey: cFWPM_CONDITION_L2_FLAGS,
matchType: cFWP_MATCH_EQUAL,
conditionValue: wtFwpConditionValue0{
_type: cFWP_UINT32,
value: uintptr(cFWP_CONDITION_L2_IS_VM2VM),
},
}
filter := wtFwpmFilter0{
providerKey: &baseObjects.provider,
subLayerKey: baseObjects.filters,
weight: filterWeight(weight),
numFilterConditions: 1,
filterCondition: (*wtFwpmFilterCondition0)(unsafe.Pointer(&condition)),
action: wtFwpmAction0{
_type: cFWP_ACTION_PERMIT,
},
}
filterID := uint64(0)
//
// #1 Outbound.
//
{
displayData, err := createWtFwpmDisplayData0("Permit Hyper-V => Hyper-V outbound", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_OUTBOUND_MAC_FRAME_NATIVE
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #2 Inbound.
//
{
displayData, err := createWtFwpmDisplayData0("Permit Hyper-V => Hyper-V inbound", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_INBOUND_MAC_FRAME_NATIVE
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
return nil
}
// Block all traffic except what is explicitly permitted by other rules.
func blockAll(session uintptr, baseObjects *baseObjects, weight uint8) error {
filter := wtFwpmFilter0{
providerKey: &baseObjects.provider,
subLayerKey: baseObjects.filters,
weight: filterWeight(weight),
action: wtFwpmAction0{
_type: cFWP_ACTION_BLOCK,
},
}
filterID := uint64(0)
//
// #1 Block outbound traffic on IPv4.
//
{
displayData, err := createWtFwpmDisplayData0("Block all outbound (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #2 Block inbound traffic on IPv4.
//
{
displayData, err := createWtFwpmDisplayData0("Block all inbound (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #3 Block outbound traffic on IPv6.
//
{
displayData, err := createWtFwpmDisplayData0("Block all outbound (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #4 Block inbound traffic on IPv6.
//
{
displayData, err := createWtFwpmDisplayData0("Block all inbound (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
return nil
}
// Block all DNS traffic except towards specified DNS servers.
func blockDNS(except []netip.Addr, session uintptr, baseObjects *baseObjects, weightAllow, weightDeny uint8) error {
if weightDeny >= weightAllow {
return errors.New("The allow weight must be greater than the deny weight")
}
denyConditions := []wtFwpmFilterCondition0{
{
fieldKey: cFWPM_CONDITION_IP_REMOTE_PORT,
matchType: cFWP_MATCH_EQUAL,
conditionValue: wtFwpConditionValue0{
_type: cFWP_UINT16,
value: uintptr(53),
},
},
{
fieldKey: cFWPM_CONDITION_IP_PROTOCOL,
matchType: cFWP_MATCH_EQUAL,
conditionValue: wtFwpConditionValue0{
_type: cFWP_UINT8,
value: uintptr(cIPPROTO_UDP),
},
},
// Repeat the condition type for logical OR.
{
fieldKey: cFWPM_CONDITION_IP_PROTOCOL,
matchType: cFWP_MATCH_EQUAL,
conditionValue: wtFwpConditionValue0{
_type: cFWP_UINT8,
value: uintptr(cIPPROTO_TCP),
},
},
}
filter := wtFwpmFilter0{
providerKey: &baseObjects.provider,
subLayerKey: baseObjects.filters,
weight: filterWeight(weightDeny),
numFilterConditions: uint32(len(denyConditions)),
filterCondition: (*wtFwpmFilterCondition0)(unsafe.Pointer(&denyConditions[0])),
action: wtFwpmAction0{
_type: cFWP_ACTION_BLOCK,
},
}
filterID := uint64(0)
//
// #1 Block IPv4 outbound DNS.
//
{
displayData, err := createWtFwpmDisplayData0("Block DNS outbound (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #2 Block IPv4 inbound DNS.
//
{
displayData, err := createWtFwpmDisplayData0("Block DNS inbound (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #3 Block IPv6 outbound DNS.
//
{
displayData, err := createWtFwpmDisplayData0("Block DNS outbound (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #4 Block IPv6 inbound DNS.
//
{
displayData, err := createWtFwpmDisplayData0("Block DNS inbound (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
allowConditionsV4 := make([]wtFwpmFilterCondition0, 0, len(denyConditions)+len(except))
allowConditionsV4 = append(allowConditionsV4, denyConditions...)
for _, ip := range except {
if !ip.Is4() {
continue
}
allowConditionsV4 = append(allowConditionsV4, wtFwpmFilterCondition0{
fieldKey: cFWPM_CONDITION_IP_REMOTE_ADDRESS,
matchType: cFWP_MATCH_EQUAL,
conditionValue: wtFwpConditionValue0{
_type: cFWP_UINT32,
value: uintptr(binary.BigEndian.Uint32(ip.AsSlice())),
},
})
}
storedPointers := make([]*wtFwpByteArray16, 0, len(except))
allowConditionsV6 := make([]wtFwpmFilterCondition0, 0, len(denyConditions)+len(except))
allowConditionsV6 = append(allowConditionsV6, denyConditions...)
for _, ip := range except {
if !ip.Is6() {
continue
}
address := wtFwpByteArray16{byteArray16: ip.As16()}
allowConditionsV6 = append(allowConditionsV6, wtFwpmFilterCondition0{
fieldKey: cFWPM_CONDITION_IP_REMOTE_ADDRESS,
matchType: cFWP_MATCH_EQUAL,
conditionValue: wtFwpConditionValue0{
_type: cFWP_BYTE_ARRAY16_TYPE,
value: uintptr(unsafe.Pointer(&address)),
},
})
storedPointers = append(storedPointers, &address)
}
filter = wtFwpmFilter0{
providerKey: &baseObjects.provider,
subLayerKey: baseObjects.filters,
weight: filterWeight(weightAllow),
numFilterConditions: uint32(len(allowConditionsV4)),
filterCondition: (*wtFwpmFilterCondition0)(unsafe.Pointer(&allowConditionsV4[0])),
action: wtFwpmAction0{
_type: cFWP_ACTION_PERMIT,
},
}
filterID = uint64(0)
//
// #5 Allow IPv4 outbound DNS.
//
if len(allowConditionsV4) > len(denyConditions) {
displayData, err := createWtFwpmDisplayData0("Allow DNS outbound (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #6 Allow IPv4 inbound DNS.
//
if len(allowConditionsV4) > len(denyConditions) {
displayData, err := createWtFwpmDisplayData0("Allow DNS inbound (IPv4)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
filter.filterCondition = (*wtFwpmFilterCondition0)(unsafe.Pointer(&allowConditionsV6[0]))
filter.numFilterConditions = uint32(len(allowConditionsV6))
//
// #7 Allow IPv6 outbound DNS.
//
if len(allowConditionsV6) > len(denyConditions) {
displayData, err := createWtFwpmDisplayData0("Allow DNS outbound (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_CONNECT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
//
// #8 Allow IPv6 inbound DNS.
//
if len(allowConditionsV6) > len(denyConditions) {
displayData, err := createWtFwpmDisplayData0("Allow DNS inbound (IPv6)", "")
if err != nil {
return wrapErr(err)
}
filter.displayData = *displayData
filter.layerKey = cFWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V6
err = fwpmFilterAdd0(session, &filter, 0, &filterID)
if err != nil {
return wrapErr(err)
}
}
runtime.KeepAlive(storedPointers)
return nil
}