yggdrasil-network/yggdrasil-go
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Check CKR remotes when receiving traffic

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This commit is contained in:
Neil Alexander 2019-08-20 09:38:46 +01:00
parent 2b6462c8a9
commit b6e67bc0ba
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GPG key ID: A02A2019A2BB0944
2 changed files with 36 additions and 23 deletions
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21
src/tuntap/iface.go
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@ -21,6 +21,7 @@ func (tun *TunAdapter) writer() error {
if n == 0 {
continue
}
var srcAddr address.Address
var dstAddr address.Address
var addrlen int
// Check whether the packet is IPv4, IPv6 or neither
@ -31,8 +32,9 @@ func (tun *TunAdapter) writer() error {
util.PutBytes(b)
continue
}
// Extract the destination IPv6 address
copy(dstAddr[:16], b[24:])
// Extract the IPv6 addresses
copy(srcAddr[:16], b[8:24])
copy(dstAddr[:16], b[24:40])
addrlen = 16
} else if b[0]&0xf0 == 0x40 {
// IPv4 packet found
@ -41,8 +43,9 @@ func (tun *TunAdapter) writer() error {
util.PutBytes(b)
continue
}
// Extract the destination IPv4 address
copy(dstAddr[:4], b[16:])
// Extract the IPv4 addresses
copy(srcAddr[:4], b[12:16])
copy(dstAddr[:4], b[16:20])
addrlen = 4
} else {
// Neither IPv4 nor IPv6
@ -54,6 +57,16 @@ func (tun *TunAdapter) writer() error {
util.PutBytes(b)
continue
}
if srcAddr[0] != 0x02 && srcAddr[0] != 0x03 {
// TODO: is this check useful? this doesn't actually guarantee that the
// packet came from the configured public key for that remote, just that
// it came from *a* configured remote. at this stage we have no ability
// to know which Conn or public key was involved
if _, err := tun.ckr.getPublicKeyForAddress(srcAddr, addrlen); err != nil {
util.PutBytes(b)
continue
}
}
} else {
if addrlen != 16 {
util.PutBytes(b)