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Support IPv4 in ckr.go

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This commit is contained in:
Neil Alexander 2018-11-06 20:04:49 +00:00
parent cb7a5f17d9
commit 424faa1c51
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GPG Key ID: A02A2019A2BB0944
4 changed files with 113 additions and 67 deletions
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164
src/yggdrasil/ckr.go
View File

@ -79,15 +79,30 @@ func (c *cryptokey) addSourceSubnet(cidr string) error {
return err
}
// Get the prefix length and size
_, prefixsize := ipnet.Mask.Size()
// Build our references to the routing sources
var routingsources *[]net.IPNet
// Check if the prefix is IPv4 or IPv6
if prefixsize == net.IPv6len*8 {
routingsources = &c.ipv6sources
} else if prefixsize == net.IPv4len*8 {
routingsources = &c.ipv4sources
} else {
return errors.New("Unexpected prefix size")
}
// Check if we already have this CIDR
for _, subnet := range c.ipv6sources {
for _, subnet := range *routingsources {
if subnet.String() == ipnet.String() {
return errors.New("Source subnet already configured")
}
}
// Add the source subnet
c.ipv6sources = append(c.ipv6sources, *ipnet)
*routingsources = append(*routingsources, *ipnet)
c.core.log.Println("Added CKR source subnet", cidr)
return nil
}
@ -102,92 +117,111 @@ func (c *cryptokey) addRoute(cidr string, dest string) error {
// Get the prefix length and size
_, prefixsize := ipnet.Mask.Size()
// Build our references to the routing table and cache
var routingtable *[]cryptokey_route
var routingcache *map[address]cryptokey_route
// Check if the prefix is IPv4 or IPv6
if prefixsize == net.IPv6len*8 {
// Is the route an Yggdrasil destination?
var addr address
var snet subnet
copy(addr[:], ipaddr)
copy(snet[:], ipnet.IP)
if addr.isValid() || snet.isValid() {
return errors.New("Can't specify Yggdrasil destination as crypto-key route")
}
// Do we already have a route for this subnet?
for _, route := range c.ipv6routes {
if route.subnet.String() == ipnet.String() {
return errors.New(fmt.Sprintf("Route already exists for %s", cidr))
}
}
// Decode the public key
if boxPubKey, err := hex.DecodeString(dest); err != nil {
return err
} else {
// Add the new crypto-key route
c.ipv6routes = append(c.ipv6routes, cryptokey_route{
subnet: *ipnet,
destination: boxPubKey,
})
// Sort so most specific routes are first
sort.Slice(c.ipv6routes, func(i, j int) bool {
im, _ := c.ipv6routes[i].subnet.Mask.Size()
jm, _ := c.ipv6routes[j].subnet.Mask.Size()
return im > jm
})
// Clear the cache as this route might change future routing
// Setting an empty slice keeps the memory whereas nil invokes GC
for k := range c.ipv6cache {
delete(c.ipv6cache, k)
}
c.core.log.Println("Added CKR destination subnet", cidr)
return nil
}
routingtable = &c.ipv6routes
routingcache = &c.ipv6cache
} else if prefixsize == net.IPv4len*8 {
// IPv4
return errors.New("IPv4 not supported at this time")
routingtable = &c.ipv4routes
routingcache = &c.ipv4cache
} else {
return errors.New("Unexpected prefix size")
}
// Is the route an Yggdrasil destination?
var addr address
var snet subnet
copy(addr[:], ipaddr)
copy(snet[:], ipnet.IP)
if addr.isValid() || snet.isValid() {
return errors.New("Can't specify Yggdrasil destination as crypto-key route")
}
// Do we already have a route for this subnet?
for _, route := range *routingtable {
if route.subnet.String() == ipnet.String() {
return errors.New(fmt.Sprintf("Route already exists for %s", cidr))
}
}
// Decode the public key
if boxPubKey, err := hex.DecodeString(dest); err != nil {
return err
} else {
// Add the new crypto-key route
*routingtable = append(*routingtable, cryptokey_route{
subnet: *ipnet,
destination: boxPubKey,
})
// Sort so most specific routes are first
sort.Slice(*routingtable, func(i, j int) bool {
im, _ := (*routingtable)[i].subnet.Mask.Size()
jm, _ := (*routingtable)[j].subnet.Mask.Size()
return im > jm
})
// Clear the cache as this route might change future routing
// Setting an empty slice keeps the memory whereas nil invokes GC
for k := range *routingcache {
delete(*routingcache, k)
}
c.core.log.Println("Added CKR destination subnet", cidr)
return nil
}
return errors.New("Unspecified error")
}
func (c *cryptokey) getPublicKeyForAddress(addr address) (boxPubKey, error) {
func (c *cryptokey) getPublicKeyForAddress(addr address, addrlen int) (boxPubKey, error) {
// Check if the address is a valid Yggdrasil address - if so it
// is exempt from all CKR checking
if addr.isValid() {
return boxPubKey{}, errors.New("Cannot look up CKR for Yggdrasil addresses")
}
// Build our references to the routing table and cache
var routingtable *[]cryptokey_route
var routingcache *map[address]cryptokey_route
// Check if the prefix is IPv4 or IPv6
if addrlen == net.IPv6len {
routingtable = &c.ipv6routes
routingcache = &c.ipv6cache
} else if addrlen == net.IPv4len {
routingtable = &c.ipv4routes
routingcache = &c.ipv4cache
} else {
return boxPubKey{}, errors.New("Unexpected prefix size")
}
// Check if there's a cache entry for this addr
if route, ok := c.ipv6cache[addr]; ok {
if route, ok := (*routingcache)[addr]; ok {
var box boxPubKey
copy(box[:boxPubKeyLen], route.destination)
return box, nil
}
// No cache was found - start by converting the address into a net.IP
ip := make(net.IP, 16)
copy(ip[:16], addr[:])
ip := make(net.IP, addrlen)
copy(ip[:addrlen], addr[:])
// Check whether it's an IPv4 or an IPv6 address
if ip.To4() == nil {
// Check if we have a route. At this point c.ipv6routes should be
// pre-sorted so that the most specific routes are first
for _, route := range c.ipv6routes {
// Does this subnet match the given IP?
if route.subnet.Contains(ip) {
// Cache the entry for future packets to get a faster lookup
c.ipv6cache[addr] = route
// Check if we have a route. At this point c.ipv6routes should be
// pre-sorted so that the most specific routes are first
for _, route := range *routingtable {
// Does this subnet match the given IP?
if route.subnet.Contains(ip) {
// Cache the entry for future packets to get a faster lookup
(*routingcache)[addr] = route
// Return the boxPubKey
var box boxPubKey
copy(box[:boxPubKeyLen], route.destination)
return box, nil
}
// Return the boxPubKey
var box boxPubKey
copy(box[:boxPubKeyLen], route.destination)
return box, nil
}
} else {
// IPv4 isn't supported yet
return boxPubKey{}, errors.New("IPv4 not supported at this time")
}
// No route was found if we got to this point

2
src/yggdrasil/config/config.go
View File

@ -42,4 +42,6 @@ type TunnelRouting struct {
Enable bool `comment:"Enable or disable tunneling."`
IPv6Destinations map[string]string `comment:"IPv6 subnets, mapped to the EncryptionPublicKey to which they should\nbe routed to."`
IPv6Sources []string `comment:"Optional IPv6 subnets which are allowed to be used as source addresses\nin addition to this node's Yggdrasil address/subnet."`
IPv4Destinations map[string]string `comment:"IPv4 subnets, mapped to the EncryptionPublicKey to which they should\nbe routed to."`
IPv4Sources []string `comment:"Optional IPv4 subnets which are allowed to be used as source addresses."`
}

10
src/yggdrasil/core.go
View File

@ -134,6 +134,16 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
panic(err)
}
}
for ipv4, pubkey := range nc.TunnelRouting.IPv4Destinations {
if err := c.router.cryptokey.addRoute(ipv4, pubkey); err != nil {
panic(err)
}
}
for _, source := range nc.TunnelRouting.IPv4Sources {
if c.router.cryptokey.addSourceSubnet(source); err != nil {
panic(err)
}
}
}
if err := c.admin.start(); err != nil {

4
src/yggdrasil/router.go
View File

@ -134,7 +134,7 @@ func (r *router) sendPacket(bs []byte) {
copy(dest[:], bs[24:])
copy(snet[:], bs[24:])
if !dest.isValid() && !snet.isValid() {
if key, err := r.cryptokey.getPublicKeyForAddress(dest); err == nil {
if key, err := r.cryptokey.getPublicKeyForAddress(dest, 16); err == nil {
addr := *address_addrForNodeID(getNodeID(&key))
copy(dest[:], addr[:])
copy(snet[:], addr[:])
@ -273,7 +273,7 @@ func (r *router) recvPacket(bs []byte, sinfo *sessionInfo) {
case source.isValid() && source == sinfo.theirAddr:
case snet.isValid() && snet == sinfo.theirSubnet:
default:
key, err := r.cryptokey.getPublicKeyForAddress(source)
key, err := r.cryptokey.getPublicKeyForAddress(source, 16)
if err != nil || key != sinfo.theirPermPub {
util_putBytes(bs)
return