Added the ability to set the validity period of the client certificate. (#301)

Signed-off-by: Paramoshka <parfenov_ivan_42a@mail.ru>

README.md

@@ -158,6 +158,9 @@ Flags:
   --auth.db="./easyrsa/pki/users.db"
   (or OVPN_AUTH_DB_PATH)      database path for password authorization
 
+  --auth.db-init
+  (or OVPN_AUTH_DB_INIT)      enable database init if user db not exists or size is 0
+   
   --log.level                  set log level: trace, debug, info, warn, error (default info)
   (or LOG_LEVEL)
   

certificates.go

@@ -8,7 +8,9 @@ import (
 	"crypto/x509/pkix"
 	"encoding/pem"
 	"errors"
+	"fmt"
 	"math/big"
+	"strconv"
 	"time"
 )
 
@@ -60,7 +62,6 @@ func genPrivKey() (privKeyPEM *bytes.Buffer, err error) {
 		Bytes: privKeyPKCS8,
 	})
 
-
 	return
 }
 
@@ -133,6 +134,17 @@ func genClientCert(privKey, caPrivKey *rsa.PrivateKey, ca *x509.Certificate, cn
 	serialNumberRange := new(big.Int).Lsh(big.NewInt(1), 128)
 	serial, err := rand.Int(rand.Reader, serialNumberRange)
 
+	certLifetimeDays, err := strconv.Atoi(*clientCertExpirationDays)
+	if err != nil {
+		return nil, fmt.Errorf("can't get client certificate expiration value: %w", err)
+	}
+
+	notBefore := time.Now()
+	notAfter := notBefore.Add(time.Duration(certLifetimeDays) * 24 * time.Hour)
+	if notAfter.After(ca.NotAfter) {
+		notAfter = ca.NotAfter
+	}
+
 	template := x509.Certificate{
 		BasicConstraintsValid: true,
 		DNSNames:              []string{cn},
@@ -142,8 +154,8 @@ func genClientCert(privKey, caPrivKey *rsa.PrivateKey, ca *x509.Certificate, cn
 		},
 		KeyUsage:    x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment,
 		ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
-		NotBefore:   time.Now(),
-		NotAfter:    ca.NotAfter,
+		NotBefore:   notBefore,
+		NotAfter:    notAfter,
 	}
 
 	issuerBytes, err := x509.CreateCertificate(rand.Reader, &template, ca, &privKey.PublicKey, caPrivKey)

main.go

@@ -9,11 +9,7 @@ import (
 	"encoding/pem"
 	"errors"
 	"fmt"
-	"github.com/google/uuid"
 	"io/ioutil"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/client-go/kubernetes"
-	"k8s.io/client-go/rest"
 	"net"
 	"net/http"
 	"os"
@@ -25,6 +21,11 @@ import (
 	"time"
 	"unicode/utf8"
 
+	"github.com/google/uuid"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+
 	"github.com/gobuffalo/packr/v2"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
@@ -71,9 +72,11 @@ var (
 	ccdTemplatePath          = kingpin.Flag("templates.ccd-path", "path to custom ccd.tpl").Default("").Envar("OVPN_TEMPLATES_CCD_PATH").String()
 	authByPassword           = kingpin.Flag("auth.password", "enable additional password authentication").Default("false").Envar("OVPN_AUTH").Bool()
 	authDatabase             = kingpin.Flag("auth.db", "database path for password authentication").Default("./easyrsa/pki/users.db").Envar("OVPN_AUTH_DB_PATH").String()
+	authDataBaseInit         = kingpin.Flag("auth.db-init", "enable database initialization if db user not exists or size is 0").Default("false").Envar("OVPN_AUTH_DB_INIT").Bool()
 	logLevel                 = kingpin.Flag("log.level", "set log level: trace, debug, info, warn, error (default info)").Default("info").Envar("LOG_LEVEL").String()
 	logFormat                = kingpin.Flag("log.format", "set log format: text, json (default text)").Default("text").Envar("LOG_FORMAT").String()
 	storageBackend           = kingpin.Flag("storage.backend", "storage backend: filesystem, kubernetes.secrets (default filesystem)").Default("filesystem").Envar("STORAGE_BACKEND").String()
+	clientCertExpirationDays = kingpin.Flag("client-cert.expiration-days", "Expiration period of OpenVPN client certificates in days, the period will shrink automatically to the CA expiration period").Default("3650").Envar("CLIENT_CERT_EXPIRATION_DAYS").String()
 
 	certsArchivePath = "/tmp/" + certsArchiveFileName
 	ccdArchivePath   = "/tmp/" + ccdArchiveFileName
@@ -504,6 +507,10 @@ func main() {
 		*indexTxtPath = *easyrsaDirPath + "/pki/index.txt"
 	}
 
+	if *authDataBaseInit {
+		ovpnUserInitDb()
+	}
+
 	ovpnAdmin := new(OvpnAdmin)
 
 	ovpnAdmin.lastSyncTime = "unknown"
@@ -1053,7 +1060,7 @@ func (oAdmin *OvpnAdmin) userRevoke(username string) (error, string) {
 		}
 
 		if *authByPassword {
-			o := runBash(fmt.Sprintf("openvpn-user revoke --db-path %s --user %s", *authDatabase, username))
+			o := runBash(fmt.Sprintf("openvpn-user revoke --db.path %s --user %s", *authDatabase, username))
 			log.Debug(o)
 		}
 
@@ -1115,7 +1122,7 @@ func (oAdmin *OvpnAdmin) userUnrevoke(username string) (error, string) {
 						_ = runBash(fmt.Sprintf("cd %s && %s gen-crl 1>/dev/null", *easyrsaDirPath, *easyrsaBinPath))
 
 						if *authByPassword {
-							o := runBash(fmt.Sprintf("openvpn-user restore --db-path %s --user %s", *authDatabase, username))
+							o := runBash(fmt.Sprintf("openvpn-user restore --db.path %s --user %s", *authDatabase, username))
 							log.Debug(o)
 						}
 
@@ -1340,7 +1347,7 @@ func (oAdmin *OvpnAdmin) mgmtGetActiveClients() []clientStatus {
 			break
 		}
 		oAdmin.mgmtRead(conn) // read welcome message
-		conn.Write([]byte("status\n"))
+		conn.Write([]byte("status 1\n"))
 		activeClients = append(activeClients, oAdmin.mgmtConnectedUsersParser(oAdmin.mgmtRead(conn), srv)...)
 		conn.Close()
 	}
@@ -1501,6 +1508,13 @@ func unArchiveCcd() {
 	}
 }
 
+func ovpnUserInitDb() {
+	if fi, err := os.Stat(*authDatabase); errors.Is(err, os.ErrNotExist) || fi.Size() == 0 {
+		i := runBash(fmt.Sprintf("openvpn-user --db.path %[1]s db-init && openvpn-user --db.path %[1]s db-migrate", *authDatabase))
+		log.Debug(i)
+	}
+}
+
 func (oAdmin *OvpnAdmin) syncDataFromMaster() {
 	retryCountMax := 3
 	certsDownloadFailed := true

setup/configure.sh

@@ -48,7 +48,7 @@ if [ ${OVPN_PASSWD_AUTH} = "true" ]; then
   echo "auth-user-pass-verify /etc/openvpn/scripts/auth.sh via-file" | tee -a /etc/openvpn/openvpn.conf
   echo "script-security 2" | tee -a /etc/openvpn/openvpn.conf
   echo "verify-client-cert require" | tee -a /etc/openvpn/openvpn.conf
-  openvpn-user db-init --db.path=$EASY_RSA_LOC/pki/users.db
+  openvpn-user db-init --db.path=$EASY_RSA_LOC/pki/users.db && openvpn-user db-migrate --db.path=$EASY_RSA_LOC/pki/users.db
 fi
 
 [ -d $EASY_RSA_LOC/pki ] && chmod 755 $EASY_RSA_LOC/pki