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// Copyright (C) 2019 LEAP
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package config
import (
"flag"
"log"
"os"
)
const DefaultAuthenticationModule string = "anon"
type Opts struct {
Tls bool
CaCrt string
CaKey string
TlsCrt string
TlsKey string
Port string
MetricsPort string
Auth string
AuthSecret string
ApiPath string
ProviderCaPath string
}
func checkPathExists(path string) bool {
if _, err := os.Stat(path); os.IsNotExist(err) {
return false
}
return true
}
func FallbackToEnv(variable *string, envVar, defaultVar string) {
if *variable == "" {
val, exists := os.LookupEnv(envVar)
if exists && val != "" {
*variable = val
} else {
*variable = defaultVar
}
}
}
func doCaFilesSanityCheck(caCrt string, caKey string) {
if _, err := os.Stat(caCrt); os.IsNotExist(err) {
log.Fatal("cannot find caCrt file")
}
if _, err := os.Stat(caKey); os.IsNotExist(err) {
log.Fatal("cannot find caKey file")
}
}
func doTlsFilesSanityCheck(tlsCrt string, tlsKey string) {
if _, err := os.Stat(tlsCrt); os.IsNotExist(err) {
log.Fatal("cannot find tlsCrt file")
}
if _, err := os.Stat(tlsKey); os.IsNotExist(err) {
log.Fatal("cannot find tlsKey file")
}
}
func NewOpts() *Opts {
opts := new(Opts)
initializeFlags(opts)
checkConfigurationOptions(opts)
return opts
}
func initializeFlags(opts *Opts) {
flag.StringVar(&opts.CaCrt, "vpnCaCrt", "", "Path to the CA public key used for VPN certificates")
flag.StringVar(&opts.CaKey, "vpnCaKey", "", "Path to the CA private key used for VPN certificates")
flag.BoolVar(&opts.Tls, "tls", false, "Enable TLS on the service")
flag.StringVar(&opts.TlsCrt, "tlsCrt", "", "Path to the cert file for TLS")
flag.StringVar(&opts.TlsKey, "tlsKey", "", "Path to the key file for TLS")
flag.StringVar(&opts.Port, "port", "", "Port where the server will listen (default: 8000)")
flag.StringVar(&opts.MetricsPort, "metricsPort", "", "Port where the metrics server will listen (default: 8001)")
flag.StringVar(&opts.Auth, "auth", "", "Authentication module (anon, sip2)")
flag.StringVar(&opts.ApiPath, "apiPath", "", "Path to the API public files")
flag.StringVar(&opts.ProviderCaPath, "providerCaCrt", "", "Path to the provider CA certificate")
flag.Parse()
FallbackToEnv(&opts.CaCrt, "VPNWEB_CACRT", "")
FallbackToEnv(&opts.CaKey, "VPNWEB_CAKEY", "")
FallbackToEnv(&opts.TlsCrt, "VPNWEB_TLSCRT", "")
FallbackToEnv(&opts.TlsKey, "VPNWEB_TLSKEY", "")
FallbackToEnv(&opts.Port, "VPNWEB_PORT", "8000")
FallbackToEnv(&opts.MetricsPort, "VPNWEB_METRICS_PORT", "8001")
FallbackToEnv(&opts.Auth, "VPNWEB_AUTH", DefaultAuthenticationModule)
FallbackToEnv(&opts.AuthSecret, "VPNWEB_AUTH_SECRET", "")
FallbackToEnv(&opts.ApiPath, "VPNWEB_API_PATH", "/etc/leap/config/vpn")
FallbackToEnv(&opts.ProviderCaPath, "VPNWEB_PROVIDER_CA", "/etc/leap/ca/ca.crt")
}
func checkConfigurationOptions(opts *Opts) {
if opts.CaCrt == "" {
log.Fatal("missing caCrt parameter")
}
if opts.CaKey == "" {
log.Fatal("missing caKey parameter")
}
if opts.Tls == true {
if opts.TlsCrt == "" {
log.Fatal("missing tls_crt parameter")
}
if opts.TlsKey == "" {
log.Fatal("missing tls_key parameter")
}
}
doCaFilesSanityCheck(opts.CaCrt, opts.CaKey)
if opts.Tls == true {
doTlsFilesSanityCheck(opts.TlsCrt, opts.TlsKey)
}
if !checkPathExists(opts.ApiPath) {
log.Fatal("Configured API path does not exist: ", opts.ApiPath)
}
if !checkPathExists(opts.ProviderCaPath) {
log.Fatal("Configured provider CA path does not exist: ", opts.ProviderCaPath)
}
log.Println("Authentication module:", opts.Auth)
}
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