feat: add self_signed_certificates for client net test

Signed-off-by: Minh Huy Tran <[email protected]>

Author: NhoxxKienn

Diff for: client/test/setup.go

@@ -79,7 +79,7 @@ func MakeNetRoleSetups(t *testing.T, rng *rand.Rand, s *ethctest.Setup, names []
 	setups := make([]clienttest.RoleSetup, len(names))
 	commonName := "127.0.0.1"
 	sans := []string{"127.0.0.1", "localhost"}
-	tlsConfigs, err := simple.GenerateSelfSignedCertConfigs(commonName, sans, len(names))
+	tlsConfigs, err := GenerateSelfSignedCertConfigs(commonName, sans, len(names))
 	if err != nil {
 		panic("Error generating TLS configs: " + err.Error())
 	}

Diff for: client/test/tls.go

@@ -0,0 +1,107 @@
+// Copyright 2022 - See NOTICE file for copyright holders.
+//
+// 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.
+
+package test
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"fmt"
+	"math/big"
+	"net"
+	"time"
+)
+
+// GenerateSelfSignedCertConfigs generates self-signed certificates and returns
+// a list of TLS configurations for n clients.
+func GenerateSelfSignedCertConfigs(commonName string, sans []string, numClients int) ([]*tls.Config, error) {
+	keySize := 2048
+	configs := make([]*tls.Config, numClients)
+	certPEMs := make([][]byte, numClients)
+	tlsCerts := make([]tls.Certificate, numClients)
+
+	for i := 0; i < numClients; i++ {
+		// Private key for the client
+		privateKey, err := rsa.GenerateKey(rand.Reader, keySize)
+		if err != nil {
+			return nil, err
+		}
+
+		// Create a certificate template
+		template := x509.Certificate{
+			SerialNumber: big.NewInt(int64(i) + 1),
+			Subject: pkix.Name{
+				Organization: []string{"Perun Network"},
+				CommonName:   fmt.Sprintf("%s-client-%d", commonName, i+1),
+			},
+			NotBefore:             time.Now(),
+			NotAfter:              time.Now().Add(24 * time.Hour),
+			KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
+			ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
+			BasicConstraintsValid: true,
+		}
+
+		// Add SANs to the server certificate template
+		for _, san := range sans {
+			if ip := net.ParseIP(san); ip != nil {
+				template.IPAddresses = append(template.IPAddresses, ip)
+			} else {
+				template.DNSNames = append(template.DNSNames, san)
+			}
+		}
+
+		// Generate a self-signed server certificate
+		certDER, err := x509.CreateCertificate(rand.Reader, &template, &template, &privateKey.PublicKey, privateKey)
+		if err != nil {
+			return nil, err
+		}
+
+		// Encode the server certificate to PEM format
+		certPEMs[i] = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
+
+		// Encode the server private key to PEM format
+		keyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey)})
+
+		// Create a tls.Certificate object for the server
+		tlsCerts[i], err = tls.X509KeyPair(certPEMs[i], keyPEM)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	for i := 0; i < numClients; i++ {
+		certPool := x509.NewCertPool()
+		for j := 0; j < numClients; j++ {
+			ok := certPool.AppendCertsFromPEM(certPEMs[j])
+			if !ok {
+				return nil, fmt.Errorf("failed to parse root certificate")
+			}
+		}
+
+		// Create the server-side TLS configuration
+		configs[i] = &tls.Config{
+			RootCAs:      certPool,
+			ClientCAs:    certPool,
+			Certificates: []tls.Certificate{tlsCerts[i]},
+			ClientAuth:   tls.RequireAndVerifyClientCert,
+			MinVersion:   tls.VersionTLS12, // Set minimum TLS version to TLS 1.2
+		}
+	}
+
+	return configs, nil
+}