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Use query string instead, allow specifying multiple keys (might be useful for DNS RR)

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This commit is contained in:
Neil Alexander 2020-05-09 00:43:19 +01:00
parent e849b3e119
commit fbf59184ee
No known key found for this signature in database
GPG Key ID: A02A2019A2BB0944
1 changed files with 39 additions and 27 deletions
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66
src/yggdrasil/link.go
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@ -70,7 +70,8 @@ type linkInterface struct {
}
type linkOptions struct {
pinningInfo *url.Userinfo
pinnedCurve25519Keys []crypto.BoxPubKey
pinnedEd25519Keys []crypto.SigPubKey
}
func (l *link) init(c *Core) error {
@ -99,8 +100,27 @@ func (l *link) call(uri string, sintf string) error {
}
pathtokens := strings.Split(strings.Trim(u.Path, "/"), "/")
tcpOpts := tcpOptions{}
if u.User != nil {
tcpOpts.pinningInfo = u.User
if pubkeys, ok := u.Query()["curve25519"]; ok && len(pubkeys) > 0 {
for _, pubkey := range pubkeys {
if boxPub, err := hex.DecodeString(pubkey); err != nil {
var boxPubKey crypto.BoxPubKey
copy(boxPubKey[:], boxPub)
tcpOpts.pinnedCurve25519Keys = append(
tcpOpts.pinnedCurve25519Keys, boxPubKey,
)
}
}
}
if pubkeys, ok := u.Query()["ed25519"]; ok && len(pubkeys) > 0 {
for _, pubkey := range pubkeys {
if sigPub, err := hex.DecodeString(pubkey); err != nil {
var sigPubKey crypto.SigPubKey
copy(sigPubKey[:], sigPub)
tcpOpts.pinnedEd25519Keys = append(
tcpOpts.pinnedEd25519Keys, sigPubKey,
)
}
}
}
switch u.Scheme {
case "tcp":
@ -196,32 +216,24 @@ func (intf *linkInterface) handler() error {
}
// Check if the remote side matches the keys we expected. This is a bit of a weak
// check - in future versions we really should check a signature or something like that.
if pinning := intf.options.pinningInfo; pinning != nil {
allowed := true
keytype := pinning.Username()
if pubkey, ok := pinning.Password(); ok {
switch keytype {
case "curve25519":
boxPub, err := hex.DecodeString(pubkey)
if err != nil || len(boxPub) != crypto.BoxPubKeyLen {
allowed = false
break
}
allowed = bytes.Compare(boxPub, meta.box[:]) == 0
case "ed25519":
sigPub, err := hex.DecodeString(pubkey)
if err != nil || len(sigPub) != crypto.SigPubKeyLen {
allowed = false
break
}
allowed = bytes.Compare(sigPub, meta.sig[:]) == 0
}
} else {
allowed = false
if pinned := intf.options.pinnedCurve25519Keys; len(pinned) > 0 {
allowed := false
for _, key := range pinned {
allowed = allowed || (bytes.Compare(key[:], meta.box[:]) == 0)
}
if !allowed {
intf.link.core.log.Errorf("Failed to connect to node: %q sent key that does not match pinned %q key", intf.name, keytype)
return fmt.Errorf("failed to connect: host does not match pinned %q key", pinning.Username())
intf.link.core.log.Errorf("Failed to connect to node: %q sent curve25519 key that does not match pinned keys", intf.name)
return fmt.Errorf("failed to connect: host sent curve25519 key that does not match pinned keys")
}
}
if pinned := intf.options.pinnedEd25519Keys; len(pinned) > 0 {
allowed := false
for _, key := range pinned {
allowed = allowed || (bytes.Compare(key[:], meta.sig[:]) == 0)
}
if !allowed {
intf.link.core.log.Errorf("Failed to connect to node: %q sent ed25519 key that does not match pinned keys", intf.name)
return fmt.Errorf("failed to connect: host sent ed25519 key that does not match pinned keys")
}
}
// Check if we're authorized to connect to this key / IP