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(broken state) WIP on tuntap

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This commit is contained in:
Arceliar 2021-05-08 10:39:07 -05:00
parent f1c37f8440
commit 0cff56fcc1
6 changed files with 524 additions and 547 deletions
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32
src/address/address.go
View File

@ -112,3 +112,35 @@ func SubnetForKey(publicKey ed25519.PublicKey) *Subnet {
snet[len(prefix)-1] |= 0x01
return &snet
}
// GetKet returns the partial ed25519.PublicKey for the Address.
// This is used for key lookup.
func (a *Address) GetKey() ed25519.PublicKey {
var key [ed25519.PublicKeySize]byte
prefix := GetPrefix()
ones := int(a[len(prefix)])
for idx := 0; idx < ones; idx++ {
key[idx/8] |= 0x80 >> byte(idx%8)
}
keyOffset := ones + 1
addrOffset := 8*len(prefix) + 8
for idx := addrOffset; idx < 8*len(a); idx++ {
bits := a[idx/8] & (0x80 >> byte(idx%8))
bits <<= byte(idx % 8)
keyIdx := keyOffset + (idx - addrOffset)
bits >>= byte(keyIdx % 8)
key[keyIdx/8] |= bits
}
for idx := range key {
key[idx] = ^key[idx]
}
return ed25519.PublicKey(key[:])
}
// GetKet returns the partial ed25519.PublicKey for the Subnet.
// This is used for key lookup.
func (s *Subnet) GetKey() ed25519.PublicKey {
var addr Address
copy(addr[:], s[:])
return addr.GetKey()
}

17
src/admin/admin.go
View File

@ -1,24 +1,24 @@
package admin
import (
"encoding/hex"
//"encoding/hex"
"encoding/json"
"errors"
"fmt"
"net"
"net/url"
"os"
"strconv"
//"strconv"
"strings"
"time"
"github.com/gologme/log"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
//"github.com/yggdrasil-network/yggdrasil-go/src/address"
"github.com/yggdrasil-network/yggdrasil-go/src/config"
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
"github.com/yggdrasil-network/yggdrasil-go/src/util"
"github.com/yggdrasil-network/yggdrasil-go/src/version"
//"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
//"github.com/yggdrasil-network/yggdrasil-go/src/util"
//"github.com/yggdrasil-network/yggdrasil-go/src/version"
"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
)
@ -82,13 +82,14 @@ func (a *AdminSocket) UpdateConfig(config *config.NodeConfig) {
}
func (a *AdminSocket) SetupAdminHandlers(na *AdminSocket) {
/* TODO
a.AddHandler("getSelf", []string{}, func(in Info) (Info, error) {
ip := a.core.Address().String()
subnet := a.core.Subnet()
return Info{
"self": Info{
ip: Info{
"box_pub_key": a.core.EncryptionPublicKey(),
// TODO"box_pub_key": a.core.EncryptionPublicKey(),
"build_name": version.BuildName(),
"build_version": version.BuildVersion(),
"coords": fmt.Sprintf("%v", a.core.Coords()),
@ -140,6 +141,7 @@ func (a *AdminSocket) SetupAdminHandlers(na *AdminSocket) {
return Info{"switchqueues": queues.asMap()}, nil
})
*/
/*
a.AddHandler("getDHT", []string{}, func(in Info) (Info, error) {
dht := make(Info)
for _, d := range a.core.GetDHT() {
@ -337,6 +339,7 @@ func (a *AdminSocket) SetupAdminHandlers(na *AdminSocket) {
}
return Info{}, err
})
*/
}
// Start runs the admin API socket to listen for / respond to admin API calls.

227
src/tuntap/conn.go
View File

@ -1,227 +0,0 @@
package tuntap
import (
"bytes"
"errors"
"time"
"github.com/Arceliar/phony"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
"github.com/yggdrasil-network/yggdrasil-go/src/util"
"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
"golang.org/x/net/icmp"
"golang.org/x/net/ipv6"
)
const tunConnTimeout = 2 * time.Minute
type tunConn struct {
phony.Inbox
tun *TunAdapter
conn *yggdrasil.Conn
addr address.Address
snet address.Subnet
stop chan struct{}
alive *time.Timer // From calling time.AfterFunc
}
func (s *tunConn) close() {
s.tun.Act(s, s._close_from_tun)
}
func (s *tunConn) _close_from_tun() {
go s.conn.Close() // Just in case it blocks on actor operations
delete(s.tun.addrToConn, s.addr)
delete(s.tun.subnetToConn, s.snet)
func() {
defer func() { recover() }()
close(s.stop) // Closes reader/writer goroutines
}()
}
func (s *tunConn) _read(bs []byte) (err error) {
select {
case <-s.stop:
err = errors.New("session was already closed")
return
default:
}
if len(bs) == 0 {
err = errors.New("read packet with 0 size")
return
}
ipv4 := len(bs) > 20 && bs[0]&0xf0 == 0x40
ipv6 := len(bs) > 40 && bs[0]&0xf0 == 0x60
isCGA := true
// Check source addresses
switch {
case ipv6 && bs[8] == 0x02 && bytes.Equal(s.addr[:16], bs[8:24]): // source
case ipv6 && bs[8] == 0x03 && bytes.Equal(s.snet[:8], bs[8:16]): // source
default:
isCGA = false
}
// Check destination addresses
switch {
case ipv6 && bs[24] == 0x02 && bytes.Equal(s.tun.addr[:16], bs[24:40]): // destination
case ipv6 && bs[24] == 0x03 && bytes.Equal(s.tun.subnet[:8], bs[24:32]): // destination
default:
isCGA = false
}
// Decide how to handle the packet
var skip bool
switch {
case isCGA: // Allowed
case s.tun.ckr.isEnabled() && (ipv4 || ipv6):
var srcAddr address.Address
var dstAddr address.Address
var addrlen int
if ipv4 {
copy(srcAddr[:], bs[12:16])
copy(dstAddr[:], bs[16:20])
addrlen = 4
}
if ipv6 {
copy(srcAddr[:], bs[8:24])
copy(dstAddr[:], bs[24:40])
addrlen = 16
}
if !s.tun.ckr.isValidLocalAddress(dstAddr, addrlen) {
// The destination address isn't in our CKR allowed range
skip = true
} else if key, err := s.tun.ckr.getPublicKeyForAddress(srcAddr, addrlen); err == nil {
if *s.conn.RemoteAddr().(*crypto.BoxPubKey) == key {
// This is the one allowed CKR case, where source and destination addresses are both good
} else {
// The CKR key associated with this address doesn't match the sender's NodeID
skip = true
}
} else {
// We have no CKR route for this source address
skip = true
}
default:
skip = true
}
if skip {
err = errors.New("address not allowed")
return
}
s.tun.writer.writeFrom(s, bs)
s.stillAlive()
return
}
func (s *tunConn) writeFrom(from phony.Actor, bs []byte) {
s.Act(from, func() {
s._write(bs)
})
}
func (s *tunConn) _write(bs []byte) (err error) {
select {
case <-s.stop:
err = errors.New("session was already closed")
return
default:
}
v4 := len(bs) > 20 && bs[0]&0xf0 == 0x40
v6 := len(bs) > 40 && bs[0]&0xf0 == 0x60
isCGA := true
// Check source addresses
switch {
case v6 && bs[8] == 0x02 && bytes.Equal(s.tun.addr[:16], bs[8:24]): // source
case v6 && bs[8] == 0x03 && bytes.Equal(s.tun.subnet[:8], bs[8:16]): // source
default:
isCGA = false
}
// Check destiantion addresses
switch {
case v6 && bs[24] == 0x02 && bytes.Equal(s.addr[:16], bs[24:40]): // destination
case v6 && bs[24] == 0x03 && bytes.Equal(s.snet[:8], bs[24:32]): // destination
default:
isCGA = false
}
// Decide how to handle the packet
var skip bool
switch {
case isCGA: // Allowed
case s.tun.ckr.isEnabled() && (v4 || v6):
var srcAddr address.Address
var dstAddr address.Address
var addrlen int
if v4 {
copy(srcAddr[:], bs[12:16])
copy(dstAddr[:], bs[16:20])
addrlen = 4
}
if v6 {
copy(srcAddr[:], bs[8:24])
copy(dstAddr[:], bs[24:40])
addrlen = 16
}
if !s.tun.ckr.isValidLocalAddress(srcAddr, addrlen) {
// The source address isn't in our CKR allowed range
skip = true
} else if key, err := s.tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
if *s.conn.RemoteAddr().(*crypto.BoxPubKey) == key {
// This is the one allowed CKR case, where source and destination addresses are both good
} else {
// The CKR key associated with this address doesn't match the sender's NodeID
skip = true
}
} else {
// We have no CKR route for this destination address... why do we have the packet in the first place?
skip = true
}
default:
skip = true
}
if skip {
err = errors.New("address not allowed")
return
}
msg := yggdrasil.FlowKeyMessage{
FlowKey: util.GetFlowKey(bs),
Message: bs,
}
s.conn.WriteFrom(s, msg, func(err error) {
if err == nil {
// No point in wasting resources to send back an error if there was none
return
}
s.Act(s.conn, func() {
if e, eok := err.(yggdrasil.ConnError); !eok {
if e.Closed() {
s.tun.log.Debugln(s.conn.String(), "TUN/TAP generic write debug:", err)
} else {
s.tun.log.Errorln(s.conn.String(), "TUN/TAP generic write error:", err)
}
} else if e.PacketTooBig() {
// TODO: This currently isn't aware of IPv4 for CKR
ptb := &icmp.PacketTooBig{
MTU: int(e.PacketMaximumSize()),
Data: bs[:900],
}
if packet, err := CreateICMPv6(bs[8:24], bs[24:40], ipv6.ICMPTypePacketTooBig, 0, ptb); err == nil {
s.tun.writer.writeFrom(s, packet)
}
} else {
if e.Closed() {
s.tun.log.Debugln(s.conn.String(), "TUN/TAP conn write debug:", err)
} else {
s.tun.log.Errorln(s.conn.String(), "TUN/TAP conn write error:", err)
}
}
})
})
s.stillAlive()
return
}
func (s *tunConn) stillAlive() {
if s.alive != nil {
s.alive.Stop()
}
s.alive = time.AfterFunc(tunConnTimeout, s.close)
}

13
src/tuntap/iface.go
View File

@ -1,12 +1,12 @@
package tuntap
import (
"github.com/yggdrasil-network/yggdrasil-go/src/address"
//"github.com/yggdrasil-network/yggdrasil-go/src/address"
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
//"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
"golang.org/x/net/icmp"
"golang.org/x/net/ipv6"
//"golang.org/x/net/icmp"
//"golang.org/x/net/ipv6"
"github.com/Arceliar/phony"
)
@ -84,6 +84,8 @@ func (tun *TunAdapter) handlePacketFrom(from phony.Actor, packet []byte, err err
// does the work of reading a packet and sending it to the correct tunConn
func (tun *TunAdapter) _handlePacket(recvd []byte, err error) {
panic("TODO")
/*
if err != nil {
tun.log.Errorln("TUN iface read error:", err)
return
@ -139,7 +141,7 @@ func (tun *TunAdapter) _handlePacket(recvd []byte, err error) {
}
if tun.ckr.isEnabled() {
if addrlen != 16 || (!dstAddr.IsValid() && !dstSnet.IsValid()) {
if /*key*/ _, err := tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
if key, err := tun.ckr.getPublicKeyForAddress(dstAddr, addrlen); err == nil {
// A public key was found, get the node ID for the search
panic("TODO")
//dstNodeID := crypto.GetNodeID(&key)
@ -219,4 +221,5 @@ func (tun *TunAdapter) _handlePacket(recvd []byte, err error) {
if isIn && session != nil {
session.writeFrom(tun, bs)
}
*/
}

152
src/tuntap/keystore.go Normal file
View File

@ -0,0 +1,152 @@
package tuntap
import (
"crypto/ed25519"
"sync"
"time"
iwt "github.com/Arceliar/ironwood/types"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
)
const keyStoreTimeout = 2 * time.Minute
type keyStore struct {
tun *TunAdapter
mutex sync.Mutex
keyToInfo map[keyArray]*keyInfo
addrToInfo map[address.Address]*keyInfo
addrBuffer map[address.Address]*buffer
subnetToInfo map[address.Subnet]*keyInfo
subnetBuffer map[address.Subnet]*buffer
}
type keyArray [ed25519.PublicKeySize]byte
type keyInfo struct {
key keyArray
address address.Address
subnet address.Subnet
mtu MTU // TODO use this
timeout *time.Timer // From calling a time.AfterFunc to do cleanup
}
type buffer struct {
packets [][]byte
timeout *time.Timer
}
func (k *keyStore) init(tun *TunAdapter) {
k.tun = tun
k.keyToInfo = make(map[keyArray]*keyInfo)
k.addrToInfo = make(map[address.Address]*keyInfo)
k.addrBuffer = make(map[address.Address]*buffer)
k.subnetToInfo = make(map[address.Subnet]*keyInfo)
k.subnetBuffer = make(map[address.Subnet]*buffer)
}
func (k *keyStore) sendToAddress(addr address.Address, bs []byte) {
k.mutex.Lock()
defer k.mutex.Unlock()
if info := k.addrToInfo[addr]; info != nil {
k.tun.core.WriteTo(bs, iwt.Addr(info.key[:]))
k.resetTimeout(info)
} else {
var buf *buffer
if buf = k.addrBuffer[addr]; buf == nil {
buf = new(buffer)
k.addrBuffer[addr] = buf
}
msg := append([]byte(nil), bs...)
buf.packets = append(buf.packets, msg)
if buf.timeout != nil {
buf.timeout.Stop()
}
buf.timeout = time.AfterFunc(keyStoreTimeout, func() {
k.mutex.Lock()
defer k.mutex.Unlock()
if nbuf := k.addrBuffer[addr]; nbuf == buf {
delete(k.addrBuffer, addr)
}
})
}
}
func (k *keyStore) sendToSubnet(subnet address.Subnet, bs []byte) {
k.mutex.Lock()
defer k.mutex.Unlock()
if info := k.subnetToInfo[subnet]; info != nil {
k.tun.core.WriteTo(bs, iwt.Addr(info.key[:]))
k.resetTimeout(info)
} else {
var buf *buffer
if buf = k.subnetBuffer[subnet]; buf == nil {
buf = new(buffer)
k.subnetBuffer[subnet] = buf
}
msg := append([]byte(nil), bs...)
buf.packets = append(buf.packets, msg)
if buf.timeout != nil {
buf.timeout.Stop()
}
buf.timeout = time.AfterFunc(keyStoreTimeout, func() {
k.mutex.Lock()
defer k.mutex.Unlock()
if nbuf := k.subnetBuffer[subnet]; nbuf == buf {
delete(k.subnetBuffer, subnet)
}
})
}
}
func (k *keyStore) update(key ed25519.PublicKey) {
k.mutex.Lock()
defer k.mutex.Unlock()
var kArray keyArray
copy(kArray[:], key)
var info *keyInfo
if info = k.keyToInfo[kArray]; info == nil {
info = new(keyInfo)
info.key = kArray
info.address = *address.AddrForKey(ed25519.PublicKey(info.key[:]))
info.subnet = *address.SubnetForKey(ed25519.PublicKey(info.key[:]))
info.mtu = MTU(^uint16(0)) // TODO
k.keyToInfo[info.key] = info
k.addrToInfo[info.address] = info
k.subnetToInfo[info.subnet] = info
k.resetTimeout(info)
if buf := k.addrBuffer[info.address]; buf != nil {
for _, bs := range buf.packets {
k.tun.core.WriteTo(bs, iwt.Addr(info.key[:]))
}
delete(k.addrBuffer, info.address)
}
if buf := k.subnetBuffer[info.subnet]; buf != nil {
for _, bs := range buf.packets {
k.tun.core.WriteTo(bs, iwt.Addr(info.key[:]))
}
delete(k.subnetBuffer, info.subnet)
}
}
k.resetTimeout(info)
}
func (k *keyStore) resetTimeout(info *keyInfo) {
if info.timeout != nil {
info.timeout.Stop()
}
info.timeout = time.AfterFunc(keyStoreTimeout, func() {
k.mutex.Lock()
defer k.mutex.Unlock()
if nfo := k.keyToInfo[info.key]; nfo == info {
delete(k.keyToInfo, info.key)
}
if nfo := k.addrToInfo[info.address]; nfo == info {
delete(k.addrToInfo, info.address)
}
if nfo := k.subnetToInfo[info.subnet]; nfo == info {
delete(k.subnetToInfo, info.subnet)
}
})
}

44
src/tuntap/tun.go
View File

@ -9,6 +9,7 @@ package tuntap
// TODO: Don't block in reader on writes that are pending searches
import (
"crypto/ed25519"
"encoding/hex"
"errors"
"fmt"
@ -38,13 +39,12 @@ const tun_IPv6_HEADER_LENGTH = 40
// calling yggdrasil.Start().
type TunAdapter struct {
core *yggdrasil.Core
store keyStore
writer tunWriter
reader tunReader
config *config.NodeState
log *log.Logger
reconfigure chan chan error
listener *yggdrasil.Listener
dialer *yggdrasil.Dialer
addr address.Address
subnet address.Subnet
ckr cryptokey
@ -53,15 +53,12 @@ type TunAdapter struct {
iface tun.Device
phony.Inbox // Currently only used for _handlePacket from the reader, TODO: all the stuff that currently needs a mutex below
//mutex sync.RWMutex // Protects the below
addrToConn map[address.Address]*tunConn
subnetToConn map[address.Subnet]*tunConn
dials map[string][][]byte // Buffer of packets to send after dialing finishes
isOpen bool
}
type TunOptions struct {
Listener *yggdrasil.Listener
Dialer *yggdrasil.Dialer
//Listener *yggdrasil.Listener
//Dialer *yggdrasil.Dialer
}
// Gets the maximum supported MTU for the platform based on the defaults in
@ -113,20 +110,20 @@ func MaximumMTU() MTU {
// Init initialises the TUN module. You must have acquired a Listener from
// the Yggdrasil core before this point and it must not be in use elsewhere.
func (tun *TunAdapter) Init(core *yggdrasil.Core, config *config.NodeState, log *log.Logger, options interface{}) error {
/* TODO
tunoptions, ok := options.(TunOptions)
if !ok {
return fmt.Errorf("invalid options supplied to TunAdapter module")
}
*/
tun.core = core
tun.store.init(tun)
tun.config = config
tun.log = log
tun.listener = tunoptions.Listener
tun.dialer = tunoptions.Dialer
tun.addrToConn = make(map[address.Address]*tunConn)
tun.subnetToConn = make(map[address.Subnet]*tunConn)
tun.dials = make(map[string][][]byte)
tun.writer.tun = tun
tun.reader.tun = tun
tun.core.SetOutOfBandHandler(tun.oobHandler)
return nil
}
@ -145,7 +142,7 @@ func (tun *TunAdapter) _start() error {
return errors.New("TUN module is already started")
}
current := tun.config.GetCurrent()
if tun.config == nil || tun.listener == nil || tun.dialer == nil {
if tun.config == nil {
return errors.New("no configuration available to TUN")
}
var boxPub crypto.BoxPubKey
@ -169,9 +166,9 @@ func (tun *TunAdapter) _start() error {
if tun.MTU() != current.IfMTU {
tun.log.Warnf("Warning: Interface MTU %d automatically adjusted to %d (supported range is 1280-%d)", current.IfMTU, tun.MTU(), MaximumMTU())
}
tun.core.SetMaximumSessionMTU(tun.MTU())
// TODO tun.core.SetMaximumSessionMTU(tun.MTU())
tun.isOpen = true
go tun.handler()
// TODO go tun.handler()
tun.reader.Act(nil, tun.reader._read) // Start the reader
tun.ckr.init(tun)
return nil
@ -225,6 +222,7 @@ func (tun *TunAdapter) UpdateConfig(config *config.NodeConfig) {
tun.Act(nil, tun.ckr.configure)
}
/*
func (tun *TunAdapter) handler() error {
for {
// Accept the incoming connection
@ -283,3 +281,19 @@ func (tun *TunAdapter) _wrap(conn *yggdrasil.Conn) (c *tunConn, err error) {
// Return
return c, err
}
*/
func (tun *TunAdapter) oobHandler(fromKey, toKey ed25519.PublicKey, data []byte) {
panic("TODO")
// parse packet
// If it's a lookup then send a response
// If it's a response then (maybe) update the keystore
}
func (tun *TunAdapter) sendKeyLookup(partial ed25519.PublicKey) {
panic("TODO")
}
func (tun *TunAdapter) sendKeyResponse(dest ed25519.PublicKey) {
panic("TODO")
}