mirror of
https://github.com/yggdrasil-network/yggdrasil-go.git
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Add tunnel helper to ipv6rwc
This commit is contained in:
Neil Alexander
parent
75d2080e53
commit
bec40ed9fb
@ -2,9 +2,7 @@ package ipv6rwc
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import (
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"crypto/ed25519"
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"errors"
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"fmt"
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"net"
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"net/netip"
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"sync"
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"time"
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@ -19,15 +17,6 @@ import (
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const keyStoreTimeout = 2 * time.Minute
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/*
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// Out-of-band packet types
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const (
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typeKeyDummy = iota // nolint:deadcode,varcheck
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typeKeyLookup
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typeKeyResponse
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)
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*/
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type keyArray [ed25519.PublicKeySize]byte
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type keyStore struct {
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@ -40,6 +29,7 @@ type keyStore struct {
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addrBuffer map[address.Address]*buffer
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subnetToInfo map[address.Subnet]*keyInfo
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subnetBuffer map[address.Subnet]*buffer
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tunnelHelper TunnelHelper
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mtu uint64
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}
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@ -59,10 +49,6 @@ func (k *keyStore) init(c *core.Core) {
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k.core = c
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k.address = *address.AddrForKey(k.core.PublicKey())
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k.subnet = *address.SubnetForKey(k.core.PublicKey())
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/*if err := k.core.SetOutOfBandHandler(k.oobHandler); err != nil {
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err = fmt.Errorf("tun.core.SetOutOfBandHander: %w", err)
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panic(err)
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}*/
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k.core.SetPathNotify(func(key ed25519.PublicKey) {
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k.update(key)
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})
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@ -182,49 +168,10 @@ func (k *keyStore) resetTimeout(info *keyInfo) {
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})
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}
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/*
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func (k *keyStore) oobHandler(fromKey, toKey ed25519.PublicKey, data []byte) { // nolint:unused
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if len(data) != 1+ed25519.SignatureSize {
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return
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}
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sig := data[1:]
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switch data[0] {
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case typeKeyLookup:
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snet := *address.SubnetForKey(toKey)
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if snet == k.subnet && ed25519.Verify(fromKey, toKey[:], sig) {
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// This is looking for at least our subnet (possibly our address)
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// Send a response
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k.sendKeyResponse(fromKey)
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}
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case typeKeyResponse:
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// TODO keep a list of something to match against...
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// Ignore the response if it doesn't match anything of interest...
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if ed25519.Verify(fromKey, toKey[:], sig) {
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k.update(fromKey)
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}
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}
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}
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*/
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func (k *keyStore) sendKeyLookup(partial ed25519.PublicKey) {
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/*
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sig := ed25519.Sign(k.core.PrivateKey(), partial[:])
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bs := append([]byte{typeKeyLookup}, sig...)
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//_ = k.core.SendOutOfBand(partial, bs)
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_ = bs
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*/
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k.core.SendLookup(partial)
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}
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/*
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func (k *keyStore) sendKeyResponse(dest ed25519.PublicKey) { // nolint:unused
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sig := ed25519.Sign(k.core.PrivateKey(), dest[:])
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bs := append([]byte{typeKeyResponse}, sig...)
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//_ = k.core.SendOutOfBand(dest, bs)
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_ = bs
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}
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*/
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func (k *keyStore) readPC(p []byte) (int, error) {
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buf := make([]byte, k.core.MTU(), 65535)
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for {
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@ -240,16 +187,22 @@ func (k *keyStore) readPC(p []byte) (int, error) {
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if len(bs) == 0 {
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continue
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}
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if bs[0]&0xf0 != 0x60 {
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continue // not IPv6
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}
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if len(bs) < 40 {
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ip4 := bs[0]&0xf0 == 0x40
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ip6 := bs[0]&0xf0 == 0x60
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switch {
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case !ip4 && !ip6:
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continue
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case ip6 && len(bs) < 40:
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continue
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case ip4 && len(bs) < 20:
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continue
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}
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k.mutex.Lock()
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mtu := int(k.mtu)
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th := k.tunnelHelper
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k.mutex.Unlock()
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if len(bs) > mtu {
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switch {
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case ip6 && len(bs) > mtu:
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// Using bs would make it leak off the stack, so copy to buf
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buf := make([]byte, 512)
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cn := copy(buf, bs)
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@ -261,51 +214,87 @@ func (k *keyStore) readPC(p []byte) (int, error) {
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_, _ = k.writePC(packet)
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}
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continue
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case len(bs) > mtu:
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continue
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}
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var srcAddr, dstAddr address.Address
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var srcSubnet, dstSubnet address.Subnet
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var addrlen int
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switch {
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case ip4:
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copy(srcAddr[:], bs[12:16])
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addrlen = 4
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case ip6:
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copy(srcAddr[:], bs[8:])
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copy(dstAddr[:], bs[24:])
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copy(srcSubnet[:], bs[8:])
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copy(dstAddr[:], bs[24:])
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copy(dstSubnet[:], bs[24:])
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if dstAddr != k.address && dstSubnet != k.subnet {
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continue // bad local address/subnet
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addrlen = 16
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}
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info := k.update(ed25519.PublicKey(from.(iwt.Addr)))
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if srcAddr != info.address && srcSubnet != info.subnet {
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continue // bad remote address/subnet
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srcKey := ed25519.PublicKey(from.(iwt.Addr))
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info := k.update(srcKey)
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switch {
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case ip6 && (srcAddr == info.address || srcSubnet == info.subnet):
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return copy(p, bs), nil
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case ip4, ip6:
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if th == nil {
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continue
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}
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n = copy(p, bs)
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return n, nil
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addr, ok := netip.AddrFromSlice(srcAddr[:addrlen])
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if !ok || !th.InboundAllowed(addr, srcKey) {
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continue
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}
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}
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return copy(p, bs), nil
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}
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}
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func (k *keyStore) writePC(bs []byte) (int, error) {
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if bs[0]&0xf0 != 0x60 {
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return 0, errors.New("not an IPv6 packet") // not IPv6
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if len(bs) == 0 {
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return 0, nil
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}
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if len(bs) < 40 {
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strErr := fmt.Sprint("undersized IPv6 packet, length: ", len(bs))
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return 0, errors.New(strErr)
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ip4 := bs[0]&0xf0 == 0x40
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ip6 := bs[0]&0xf0 == 0x60
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switch {
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case !ip4 && !ip6:
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return len(bs), nil
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case ip6 && len(bs) < 40:
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return len(bs), nil
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case ip4 && len(bs) < 20:
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return len(bs), nil
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}
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var srcAddr, dstAddr address.Address
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var srcSubnet, dstSubnet address.Subnet
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copy(srcAddr[:], bs[8:])
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copy(dstAddr[:], bs[24:])
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copy(srcSubnet[:], bs[8:])
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copy(dstSubnet[:], bs[24:])
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if srcAddr != k.address && srcSubnet != k.subnet {
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// This happens all the time due to link-local traffic
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// Don't send back an error, just drop it
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strErr := fmt.Sprint("incorrect source address: ", net.IP(srcAddr[:]).String())
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return 0, errors.New(strErr)
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var dstAddr address.Address
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var dstSubnet address.Subnet
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var addrlen int
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switch {
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case ip4:
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copy(dstAddr[:], bs[16:20])
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addrlen = 4
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case ip6:
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copy(dstAddr[:], bs[24:40])
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copy(dstSubnet[:], bs[24:40])
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addrlen = 16
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}
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if dstAddr.IsValid() {
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switch {
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case dstAddr.IsValid():
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k.sendToAddress(dstAddr, bs)
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} else if dstSubnet.IsValid() {
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case dstSubnet.IsValid():
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k.sendToSubnet(dstSubnet, bs)
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} else {
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return 0, errors.New("invalid destination address")
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default:
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k.mutex.Lock()
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th := k.tunnelHelper
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k.mutex.Unlock()
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if th == nil {
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return len(bs), nil
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}
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addr, ok := netip.AddrFromSlice(dstAddr[:addrlen])
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if !ok {
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return len(bs), nil
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}
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if key := th.OutboundAllowed(addr); key != nil && len(key) == ed25519.PublicKeySize {
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return k.core.WriteTo(bs, iwt.Addr(key))
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}
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return len(bs), nil
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}
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return len(bs), nil
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}
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@ -366,3 +355,14 @@ func (rwc *ReadWriteCloser) Close() error {
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rwc.core.Stop()
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return err
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}
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func (rwc *ReadWriteCloser) SetTunnelHelper(h TunnelHelper) {
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rwc.mutex.Lock()
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defer rwc.mutex.Unlock()
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rwc.tunnelHelper = h
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}
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type TunnelHelper interface {
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InboundAllowed(srcip netip.Addr, src ed25519.PublicKey) bool
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OutboundAllowed(dstip netip.Addr) ed25519.PublicKey
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}
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