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ovpncfg.go
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ovpncfg.go
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package ovpncfg
import (
"crypto/rand"
"encoding/pem"
"fmt"
"os"
"github.com/xiam/openvpn-config-generator/lib/generator"
)
const (
defaultPort = 1194
defaultProto = "udp"
defaultNetwork = "10.9.0.0"
defaultNetworkMask = "255.255.0.0"
defaultDNS1 = "8.8.8.8"
defaultDNS2 = "8.8.4.4"
)
func env(name string, defaultValue interface{}) interface{} {
if value := os.Getenv(name); value != "" {
return value
}
return defaultValue
}
func NewServerConfig() (*generator.Config, error) {
config := generator.New()
config.MustSet("port", env("PORT", defaultPort))
config.MustSet("proto", env("PROTO", defaultProto))
config.MustSet("dev", "tun")
config.MustSet("topology", "subnet")
config.MustSet("server", env("NETWORK", defaultNetwork), env("NETWORK_MASK", defaultNetworkMask))
config.MustSet("route", env("NETWORK", defaultNetwork), env("NETWORK_MASK", defaultNetworkMask))
config.MustSet("ifconfig-pool-persist", "ipp.txt")
config.MustSet("client-config-dir", "ccd")
//config.MustAdd("push", "redirect-gateway def1 bypass-dhcp")
config.MustEnable("client-to-client")
config.MustSet("keepalive", 10, 120)
config.MustAdd("push", "ping 15")
config.MustAdd("push", "ping-restart 60")
config.MustSet("cipher", "AES-256-GCM")
config.MustSet("ncp-ciphers", "AES-256-GCM:AES-256-CBC:AES-128-GCM:AES-128-CBC")
config.MustEnable("comp-lzo")
config.MustSet("user", "nobody")
config.MustSet("group", "nobody")
config.MustEnable("persist-key")
config.MustEnable("persist-tun")
config.MustSet("verb", "3")
config.MustSet("sndbuf", 0)
config.MustSet("rcvbuf", 0)
config.MustAdd("push", "sndbuf 0")
config.MustAdd("push", "rcvbuf 0")
config.MustSet("remote-cert-eku", "TLS Web Client Authentication")
return config, nil
}
func NewClientConfig() (*generator.Config, error) {
config := generator.New()
config.MustEnable("client")
config.MustSet("dev", "tun")
config.MustSet("proto", env("PROTO", defaultProto))
config.MustSet("keysize", 256)
config.MustSet("remote", "192.168.1.87", 1194)
config.MustSet("resolv-retry", "infinite")
config.MustSet("cipher", "AES-256-GCM")
config.MustEnable("nobind")
config.MustEnable("persist-key")
config.MustEnable("persist-tun")
config.MustEnable("comp-lzo")
config.MustSet("verb", "3")
return config, nil
}
func GenOpenVPNStaticKey() ([]byte, error) {
key := make([]byte, 256)
_, err := rand.Read(key)
if err != nil {
return nil, err
}
buf := []byte(
"#\n" +
"# 2048 bit OpenVPN static key\n" +
"#\n" +
"-----BEGIN OpenVPN Static key V1-----\n",
)
for i := 0; i < 16; i++ {
buf = append(buf, []byte(fmt.Sprintf("%x\n", key[i*16:(i+1)*16]))...)
}
buf = append(buf, []byte("-----END OpenVPN Static key V1-----")...)
return buf, nil
}
func WriteConfig(config *generator.Config, file string) error {
buf, err := config.Compile()
if err != nil {
return err
}
return writeFile(buf, file)
}
func WriteCert(cert []byte, file string) error {
return writeFile(pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: cert,
}), file)
}
func WriteKey(key []byte, file string) error {
return writeFile(pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: key,
}), file)
}
func writeFile(buf []byte, file string) error {
fp, err := os.Create(file)
if err != nil {
return err
}
defer fp.Close()
_, err = fp.Write(buf)
if err != nil {
return err
}
return nil
}