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net.go
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net.go
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package testutils
import (
"bytes"
"context"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"os"
"testing"
"time"
"github.com/pkg/errors"
"go.uber.org/multierr"
"go.viam.com/test"
)
var waitDur = 5 * time.Second
// ReserveRandomListener returns a new TCP listener at a random port.
func ReserveRandomListener(tb testing.TB) *net.TCPListener {
tb.Helper()
listener, err := net.ListenTCP("tcp", &net.TCPAddr{Port: 0})
test.That(tb, err, test.ShouldBeNil)
return listener
}
// WaitSuccessfulDial waits for a dial attempt to succeed.
func WaitSuccessfulDial(address string) error {
ctx, cancel := context.WithTimeout(context.Background(), waitDur)
var lastErr error
defer cancel()
for {
select {
case <-ctx.Done():
return multierr.Combine(ctx.Err(), lastErr)
default:
}
var conn net.Conn
conn, lastErr = net.Dial("tcp", address)
if lastErr == nil {
return conn.Close()
}
lastErr = errors.WithStack(lastErr)
}
}
// GenerateSelfSignedCertificate generates a self signed certificate with the given names.
func GenerateSelfSignedCertificate(commonName string, altNames ...string) (tls.Certificate, string, string, *x509.CertPool, error) {
// Create Root Certificate Authority.
caCert := &x509.Certificate{
SerialNumber: big.NewInt(2022),
Subject: pkix.Name{
Organization: []string{"Base"},
Country: []string{"Space"},
Locality: []string{"Moon"},
StreetAddress: []string{"123 Main Street"},
PostalCode: []string{"123456"},
},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(1, 0, 0),
IsCA: true,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
}
caCertPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return tls.Certificate{}, "", "", nil, err
}
caBytes, err := x509.CreateCertificate(rand.Reader, caCert, caCert, &caCertPrivKey.PublicKey, caCertPrivKey)
if err != nil {
return tls.Certificate{}, "", "", nil, err
}
// Create Certificate issued by the CA.
cert := &x509.Certificate{
SerialNumber: big.NewInt(2023),
Subject: pkix.Name{
CommonName: commonName,
Organization: []string{"Base"},
Country: []string{"Space"},
Locality: []string{"Moon"},
StreetAddress: []string{"124 Main Street"},
PostalCode: []string{"123456"},
},
DNSNames: append([]string{commonName}, altNames...),
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(1, 0, 0),
SubjectKeyId: []byte{1, 2, 3, 4, 6},
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
certPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return tls.Certificate{}, "", "", nil, err
}
certBytes, err := x509.CreateCertificate(rand.Reader, cert, caCert, &certPrivKey.PublicKey, caCertPrivKey)
if err != nil {
return tls.Certificate{}, "", "", nil, err
}
var certPEM bytes.Buffer
if err := pem.Encode(&certPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: certBytes,
}); err != nil {
return tls.Certificate{}, "", "", nil, err
}
var certPrivKeyPEM bytes.Buffer
if err := pem.Encode(&certPrivKeyPEM, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(certPrivKey),
}); err != nil {
return tls.Certificate{}, "", "", nil, err
}
tlsCert, err := tls.X509KeyPair(certPEM.Bytes(), certPrivKeyPEM.Bytes())
if err != nil {
return tls.Certificate{}, "", "", nil, err
}
certPool := x509.NewCertPool()
var caPEM bytes.Buffer
if err := pem.Encode(&caPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: caBytes,
}); err != nil {
return tls.Certificate{}, "", "", nil, err
}
if !certPool.AppendCertsFromPEM(caPEM.Bytes()) {
return tls.Certificate{}, "", "", nil, errors.New("error adding CA to pool")
}
certFile, err := os.CreateTemp("", "cert")
if err != nil {
return tls.Certificate{}, "", "", nil, err
}
if _, err := certFile.WriteString(certPEM.String()); err != nil {
return tls.Certificate{}, "", "", nil, err
}
keyFile, err := os.CreateTemp("", "key")
if err != nil {
return tls.Certificate{}, "", "", nil, err
}
if _, err := keyFile.WriteString(certPrivKeyPEM.String()); err != nil {
return tls.Certificate{}, "", "", nil, err
}
return tlsCert, certFile.Name(), keyFile.Name(), certPool, nil
}