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common.go
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common.go
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/**
* Tenta DNS Server
*
* Copyright 2017 Tenta, LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* For any questions, please contact [email protected]
*
* common.go: Common functions
*/
package common
import (
"crypto/rand"
"github.com/tenta-browser/tenta-dns/log"
"math/big"
"net"
"os"
"crypto/tls"
)
func AddSuffix(start []byte, suffix string) []byte {
return append(start, []byte("/"+suffix)...)
}
func RandInt(max uint) uint {
bi, err := rand.Int(rand.Reader, big.NewInt(int64(max)))
if err != nil {
lg := log.GetLogger("common")
lg.Fatalf("Unable to generate a random number: %s", err.Error())
os.Exit(5)
}
return uint(bi.Uint64())
}
func IsPrivateIp(a net.IP) bool {
a = a.To4()
return a[0] == 10 || // class A private network
(a[0] == 172 && a[1] >= 16 && a[1] <= 31) || // class B private networks
(a[0] == 192 && a[1] == 168) // class C private networks
}
func TLSConfigModernHTTPS() *tls.Config {
return &tls.Config{
MinVersion: tls.VersionTLS12,
CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
PreferServerCipherSuites: true,
CipherSuites: []uint16{
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_RSA_WITH_AES_128_GCM_SHA256,
},
}
}
func TLSConfigLegacyHTTPS() *tls.Config {
return &tls.Config{
MinVersion: tls.VersionTLS10,
CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
PreferServerCipherSuites: true,
CipherSuites: []uint16{
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
},
}
}
func TLSConfigDNS() *tls.Config {
return &tls.Config{
MinVersion: tls.VersionTLS12,
CurvePreferences: []tls.CurveID{tls.CurveP521, tls.CurveP384, tls.CurveP256},
PreferServerCipherSuites: true,
CipherSuites: []uint16{
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_RSA_WITH_AES_128_CBC_SHA256,
},
}
}