internal/awstesting: Update SDK custom certificate testing utils (#1626)

Updates the SDK's custom certificate testing utilities to be compatible
with Go 1.18's deprecating of SHA1. Switch from static openssl generated
certificates to generate certificates at package initialization.

Related to aws/aws-sdk-go#4316

.github/workflows/codegen.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        go-version: [1.17]
+        go-version: [1.18]
     env:
       JAVA_TOOL_OPTIONS: "-Xmx2g"
     steps:

.github/workflows/go.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        go-version: [1.17, 1.16, 1.15]
+        go-version: [1.18, 1.17, 1.16, 1.15]
     steps:
     - uses: actions/checkout@v2
 
@@ -38,7 +38,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest]
-        go-version: [1.17, 1.16, 1.15]
+        go-version: [1.18, 1.17, 1.16, 1.15]
     env:
       EACHMODULE_SKIP: "internal\\repotools\\changes"
     steps:

.github/workflows/golangci-lint.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        go-version: [1.17.x]
+        go-version: [1.18.x]
         os: [ubuntu-latest]  # other options: macos-latest, windows-latest
     steps:
       - uses: actions/checkout@v2

internal/awstesting/certificate_utils.go

@@ -0,0 +1,291 @@
+package awstesting
+
+import (
+	"bytes"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"fmt"
+	"io/ioutil"
+	"math/big"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"strings"
+	"time"
+)
+
+var (
+	// TLSBundleCA is the CA PEM
+	TLSBundleCA []byte
+
+	// TLSBundleCert is the Server PEM
+	TLSBundleCert []byte
+
+	// TLSBundleKey is the Server private key PEM
+	TLSBundleKey []byte
+
+	// ClientTLSCert is the Client PEM
+	ClientTLSCert []byte
+
+	// ClientTLSKey is the Client private key PEM
+	ClientTLSKey []byte
+)
+
+func init() {
+	caPEM, _, caCert, caPrivKey, err := generateRootCA()
+	if err != nil {
+		panic("failed to generate testing root CA, " + err.Error())
+	}
+	TLSBundleCA = caPEM
+
+	serverCertPEM, serverCertPrivKeyPEM, err := generateLocalCert(caCert, caPrivKey)
+	if err != nil {
+		panic("failed to generate testing server cert, " + err.Error())
+	}
+	TLSBundleCert = serverCertPEM
+	TLSBundleKey = serverCertPrivKeyPEM
+
+	clientCertPEM, clientCertPrivKeyPEM, err := generateLocalCert(caCert, caPrivKey)
+	if err != nil {
+		panic("failed to generate testing client cert, " + err.Error())
+	}
+	ClientTLSCert = clientCertPEM
+	ClientTLSKey = clientCertPrivKeyPEM
+}
+
+func generateRootCA() (
+	caPEM, caPrivKeyPEM []byte, caCert *x509.Certificate, caPrivKey *rsa.PrivateKey, err error,
+) {
+	caCert = &x509.Certificate{
+		SerialNumber: big.NewInt(42),
+		Subject: pkix.Name{
+			Country:      []string{"US"},
+			Organization: []string{"AWS SDK for Go Test Certificate"},
+			CommonName:   "Test Root CA",
+		},
+		NotBefore: time.Now().Add(-time.Minute),
+		NotAfter:  time.Now().AddDate(1, 0, 0),
+		KeyUsage:  x509.KeyUsageCertSign | x509.KeyUsageCRLSign | x509.KeyUsageDigitalSignature,
+		ExtKeyUsage: []x509.ExtKeyUsage{
+			x509.ExtKeyUsageClientAuth,
+			x509.ExtKeyUsageServerAuth,
+		},
+		BasicConstraintsValid: true,
+		IsCA:                  true,
+	}
+
+	// Create CA private and public key
+	caPrivKey, err = rsa.GenerateKey(rand.Reader, 4096)
+	if err != nil {
+		return nil, nil, nil, nil, fmt.Errorf("failed generate CA RSA key, %w", err)
+	}
+
+	// Create CA certificate
+	caBytes, err := x509.CreateCertificate(rand.Reader, caCert, caCert, &caPrivKey.PublicKey, caPrivKey)
+	if err != nil {
+		return nil, nil, nil, nil, fmt.Errorf("failed generate CA certificate, %w", err)
+	}
+
+	// PEM encode CA certificate and private key
+	var caPEMBuf bytes.Buffer
+	pem.Encode(&caPEMBuf, &pem.Block{
+		Type:  "CERTIFICATE",
+		Bytes: caBytes,
+	})
+
+	var caPrivKeyPEMBuf bytes.Buffer
+	pem.Encode(&caPrivKeyPEMBuf, &pem.Block{
+		Type:  "RSA PRIVATE KEY",
+		Bytes: x509.MarshalPKCS1PrivateKey(caPrivKey),
+	})
+
+	return caPEMBuf.Bytes(), caPrivKeyPEMBuf.Bytes(), caCert, caPrivKey, nil
+}
+
+func generateLocalCert(parentCert *x509.Certificate, parentPrivKey *rsa.PrivateKey) (
+	certPEM, certPrivKeyPEM []byte, err error,
+) {
+	cert := &x509.Certificate{
+		SerialNumber: big.NewInt(42),
+		Subject: pkix.Name{
+			Country:      []string{"US"},
+			Organization: []string{"AWS SDK for Go Test Certificate"},
+			CommonName:   "Test Root CA",
+		},
+		IPAddresses: []net.IP{
+			net.IPv4(127, 0, 0, 1),
+			net.IPv6loopback,
+		},
+		NotBefore: time.Now().Add(-time.Minute),
+		NotAfter:  time.Now().AddDate(1, 0, 0),
+		ExtKeyUsage: []x509.ExtKeyUsage{
+			x509.ExtKeyUsageClientAuth,
+			x509.ExtKeyUsageServerAuth,
+		},
+		KeyUsage: x509.KeyUsageDigitalSignature,
+	}
+
+	// Create server private and public key
+	certPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed to generate server RSA private key, %w", err)
+	}
+
+	// Create server certificate
+	certBytes, err := x509.CreateCertificate(rand.Reader, cert, parentCert, &certPrivKey.PublicKey, parentPrivKey)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed to generate server certificate, %w", err)
+	}
+
+	// PEM encode certificate and private key
+	var certPEMBuf bytes.Buffer
+	pem.Encode(&certPEMBuf, &pem.Block{
+		Type:  "CERTIFICATE",
+		Bytes: certBytes,
+	})
+
+	var certPrivKeyPEMBuf bytes.Buffer
+	pem.Encode(&certPrivKeyPEMBuf, &pem.Block{
+		Type:  "RSA PRIVATE KEY",
+		Bytes: x509.MarshalPKCS1PrivateKey(certPrivKey),
+	})
+
+	return certPEMBuf.Bytes(), certPrivKeyPEMBuf.Bytes(), nil
+}
+
+// NewTLSClientCertServer creates a new HTTP test server initialize to require
+// HTTP clients authenticate with TLS client certificates.
+func NewTLSClientCertServer(handler http.Handler) (*httptest.Server, error) {
+	server := httptest.NewUnstartedServer(handler)
+
+	if server.TLS == nil {
+		server.TLS = &tls.Config{}
+	}
+	server.TLS.ClientAuth = tls.RequireAndVerifyClientCert
+
+	if server.TLS.ClientCAs == nil {
+		server.TLS.ClientCAs = x509.NewCertPool()
+	}
+	certPem := append(ClientTLSCert, ClientTLSKey...)
+	if ok := server.TLS.ClientCAs.AppendCertsFromPEM(certPem); !ok {
+		return nil, fmt.Errorf("failed to append client certs")
+	}
+
+	return server, nil
+}
+
+// CreateClientTLSCertFiles returns a set of temporary files for the client
+// certificate and key files.
+func CreateClientTLSCertFiles() (cert, key string, err error) {
+	cert, err = createTmpFile(ClientTLSCert)
+	if err != nil {
+		return "", "", err
+	}
+
+	key, err = createTmpFile(ClientTLSKey)
+	if err != nil {
+		return "", "", err
+	}
+
+	return cert, key, nil
+}
+
+func availableLocalAddr(ip string) (v string, err error) {
+	l, err := net.Listen("tcp", ip+":0")
+	if err != nil {
+		return "", err
+	}
+	defer func() {
+		closeErr := l.Close()
+		if err == nil {
+			err = closeErr
+		} else if closeErr != nil {
+			err = fmt.Errorf("ip listener close error: %v, original error: %w", closeErr, err)
+		}
+	}()
+
+	return l.Addr().String(), nil
+}
+
+// CreateTLSServer will create the TLS server on an open port using the
+// certificate and key. The address will be returned that the server is running on.
+func CreateTLSServer(cert, key string, mux *http.ServeMux) (string, error) {
+	addr, err := availableLocalAddr("127.0.0.1")
+	if err != nil {
+		return "", err
+	}
+
+	if mux == nil {
+		mux = http.NewServeMux()
+		mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {})
+	}
+
+	go func() {
+		if err := http.ListenAndServeTLS(addr, cert, key, mux); err != nil {
+			panic(err)
+		}
+	}()
+
+	for i := 0; i < 60; i++ {
+		if _, err := http.Get("https://" + addr); err != nil && !strings.Contains(err.Error(), "connection refused") {
+			break
+		}
+
+		time.Sleep(1 * time.Second)
+	}
+
+	return "https://" + addr, nil
+}
+
+// CreateTLSBundleFiles returns the temporary filenames for the certificate
+// key, and CA PEM content. These files should be deleted when no longer
+// needed. CleanupTLSBundleFiles can be used for this cleanup.
+func CreateTLSBundleFiles() (cert, key, ca string, err error) {
+	cert, err = createTmpFile(TLSBundleCert)
+	if err != nil {
+		return "", "", "", err
+	}
+
+	key, err = createTmpFile(TLSBundleKey)
+	if err != nil {
+		return "", "", "", err
+	}
+
+	ca, err = createTmpFile(TLSBundleCA)
+	if err != nil {
+		return "", "", "", err
+	}
+
+	return cert, key, ca, nil
+}
+
+// CleanupTLSBundleFiles takes variadic list of files to be deleted.
+func CleanupTLSBundleFiles(files ...string) error {
+	for _, file := range files {
+		if err := os.Remove(file); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func createTmpFile(b []byte) (string, error) {
+	bundleFile, err := ioutil.TempFile(os.TempDir(), "aws-sdk-go-session-test")
+	if err != nil {
+		return "", err
+	}
+
+	_, err = bundleFile.Write(b)
+	if err != nil {
+		return "", err
+	}
+
+	defer bundleFile.Close()
+	return bundleFile.Name(), nil
+}