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Limit the number of ODoH target configs

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This commit is contained in:
Frank Denis 2021-06-05 18:35:45 +02:00
parent 06135b6141
commit 3cf5c1ab8e
1 changed files with 7 additions and 4 deletions
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11
dnscrypt-proxy/odoh.go
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@ -11,7 +11,8 @@ import (
) )
const ( const (
odohVersion = uint16(0xff06) odohVersion = uint16(0xff06)
maxODoHConfigs = 10
) )
type ODoHTargetConfig struct { type ODoHTargetConfig struct {
@ -34,7 +35,8 @@ func parseODoHTargetConfig(config []byte) (ODoHTargetConfig, error) {
kdfID := binary.BigEndian.Uint16(config[2:4]) kdfID := binary.BigEndian.Uint16(config[2:4])
aeadID := binary.BigEndian.Uint16(config[4:6]) aeadID := binary.BigEndian.Uint16(config[4:6])
publicKeyLength := binary.BigEndian.Uint16(config[6:8]) publicKeyLength := binary.BigEndian.Uint16(config[6:8])
if len(config[8:]) != int(publicKeyLength) { publicKey := config[8:]
if len(publicKey) != int(publicKeyLength) {
return ODoHTargetConfig{}, fmt.Errorf("Malformed config") return ODoHTargetConfig{}, fmt.Errorf("Malformed config")
} }
@ -43,7 +45,6 @@ func parseODoHTargetConfig(config []byte) (ODoHTargetConfig, error) {
return ODoHTargetConfig{}, err return ODoHTargetConfig{}, err
} }
publicKey := config[8:]
_, _, err = suite.NewClientContext(publicKey, []byte("odoh query"), nil) _, _, err = suite.NewClientContext(publicKey, []byte("odoh query"), nil)
if err != nil { if err != nil {
return ODoHTargetConfig{}, err return ODoHTargetConfig{}, err
@ -81,8 +82,10 @@ func parseODoHTargetConfigs(configs []byte) ([]ODoHTargetConfig, error) {
targets = append(targets, target) targets = append(targets, target)
} }
} }
offset = offset + int(configLength) + 4 offset = offset + int(configLength) + 4
if len(targets) >= maxODoHConfigs {
break
}
} }
} }