chore: create TLS certs in a consistent manner (testcontainers#2478)

* fix: remove suspicious filepath.Join

* chore: fix lint

* fix: handle error

* chore: reverse assertion for lint

* feat: support generating TLS certificates on the fly

* chore: apply to cockroachdb

* chore: support saving the cert and priv key files to disk

* chore: apply to rabbitmq

* chore: simplify

* chore: use in redpanda module

* chore: lint

* chore: set validFrom internally

* fix: properly use the new API in redpanda

* docs: document the TLS helpers

* chore: simplify WithParent to accept the struct directly

* chore: use tlscert package instead

* fix: use non-deprecated API

* docs: update

* docs: fix examples

* chore: use released version of tlscert

* fix: add common name for the node cert

container.go

@@ -229,7 +229,7 @@ func (c *ContainerRequest) GetContext() (io.Reader, error) {
 
 	if dockerIgnoreExists {
 		// only add .dockerignore if it exists
-		includes = append(includes, filepath.Join(".dockerignore"))
+		includes = append(includes, ".dockerignore")
 	}
 
 	includes = append(includes, c.GetDockerfile())

docker.go

@@ -637,6 +637,9 @@ func (c *DockerContainer) CopyToContainer(ctx context.Context, fileContent []byt
 
 func (c *DockerContainer) copyToContainer(ctx context.Context, fileContent func(tw io.Writer) error, fileContentSize int64, containerFilePath string, fileMode int64) error {
 	buffer, err := tarFile(containerFilePath, fileContent, fileContentSize, fileMode)
+	if err != nil {
+		return err
+	}
 
 	err = c.provider.client.CopyToContainer(ctx, c.ID, "/", buffer, types.CopyToContainerOptions{})
 	if err != nil {
@@ -1520,7 +1523,6 @@ func (p *DockerProvider) getDefaultNetwork(ctx context.Context, cli client.APICl
 			Attachable: true,
 			Labels:     core.DefaultLabels(core.SessionID()),
 		})
-
 		if err != nil {
 			return "", err
 		}

docker_exec_test.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/docker/docker/pkg/stdcopy"
 	"github.com/stretchr/testify/require"
+
 	tcexec "github.com/testcontainers/testcontainers-go/exec"
 )
 
@@ -133,6 +134,6 @@ func TestExecWithNonMultiplexedResponse(t *testing.T) {
 	require.NotNil(t, stdout)
 	require.NotNil(t, stderr)
 
-	require.Equal(t, stdout.String(), "stdout\n")
-	require.Equal(t, stderr.String(), "stderr\n")
+	require.Equal(t, "stdout\n", stdout.String())
+	require.Equal(t, "stderr\n", stderr.String())
 }

docs/features/tls.md

@@ -0,0 +1,17 @@
+# TLS certificates
+
+Interacting with services that require TLS certificates is a common issue when working with containers. You can create one or more on-the-fly certificates in order to communicate with your services.
+
+_Testcontainers for Go_ uses a library to generate certificates on-the-fly. This library is called [tlscert](https://github.com/mdelapenya/tlscert).
+
+### Examples
+
+In the following example we are going to start an HTTP server with a self-signed certificate.
+It exposes one single handler that will return a simple message when accessed.
+The example will also create a client that will connect to the server using the generated certificate,
+demonstrating how to use the generated certificate to communicate with a service.
+
+<!--codeinclude-->
+[Create a self-signed certificate](../../modules/cockroachdb/certs.go) inside_block:exampleSelfSignedCert
+[Sign a self-signed certificate](../../modules/cockroachdb/certs.go) inside_block:exampleSignSelfSignedCert
+<!--/codeinclude-->

mkdocs.yml

@@ -45,6 +45,7 @@ nav:
         - features/files_and_mounts.md
         - features/creating_networks.md
         - features/networking.md
+        - features/tls.md
         - features/garbage_collector.md
         - features/build_from_dockerfile.md
         - features/docker_auth.md

modules/cockroachdb/certs.go

@@ -1,14 +1,12 @@
 package cockroachdb
 
 import (
-	"crypto/rand"
-	"crypto/rsa"
 	"crypto/x509"
-	"crypto/x509/pkix"
-	"encoding/pem"
-	"math/big"
+	"fmt"
 	"net"
 	"time"
+
+	"github.com/mdelapenya/tlscert"
 )
 
 type TLSConfig struct {
@@ -21,138 +19,49 @@ type TLSConfig struct {
 
 // NewTLSConfig creates a new TLSConfig capable of running CockroachDB & connecting over TLS.
 func NewTLSConfig() (*TLSConfig, error) {
-	caCert, caKey, err := generateCA()
-	if err != nil {
-		return nil, err
+	// exampleSelfSignedCert {
+	caCert := tlscert.SelfSignedFromRequest(tlscert.Request{
+		Name:              "ca",
+		SubjectCommonName: "Cockroach Test CA",
+		Host:              "localhost,127.0.0.1",
+		IsCA:              true,
+		ValidFor:          time.Hour,
+	})
+	if caCert == nil {
+		return nil, fmt.Errorf("failed to generate CA certificate")
 	}
-
-	nodeCert, nodeKey, err := generateNode(caCert, caKey)
-	if err != nil {
-		return nil, err
+	// }
+
+	// exampleSignSelfSignedCert {
+	nodeCert := tlscert.SelfSignedFromRequest(tlscert.Request{
+		Name:              "node",
+		SubjectCommonName: "node",
+		Host:              "localhost,127.0.0.1",
+		IPAddresses:       []net.IP{net.IPv4(127, 0, 0, 1), net.IPv6loopback},
+		ValidFor:          time.Hour,
+		Parent:            caCert, // using the CA certificate as parent
+	})
+	if nodeCert == nil {
+		return nil, fmt.Errorf("failed to generate node certificate")
 	}
-
-	clientCert, clientKey, err := generateClient(caCert, caKey)
-	if err != nil {
-		return nil, err
+	// }
+
+	clientCert := tlscert.SelfSignedFromRequest(tlscert.Request{
+		Name:              "client",
+		SubjectCommonName: defaultUser,
+		Host:              "localhost,127.0.0.1",
+		ValidFor:          time.Hour,
+		Parent:            caCert, // using the CA certificate as parent
+	})
+	if clientCert == nil {
+		return nil, fmt.Errorf("failed to generate client certificate")
 	}
 
 	return &TLSConfig{
-		CACert:     caCert,
-		NodeCert:   nodeCert,
-		NodeKey:    nodeKey,
-		ClientCert: clientCert,
-		ClientKey:  clientKey,
+		CACert:     caCert.Cert,
+		NodeCert:   nodeCert.Bytes,
+		NodeKey:    nodeCert.KeyBytes,
+		ClientCert: clientCert.Bytes,
+		ClientKey:  clientCert.KeyBytes,
 	}, nil
 }
-
-func generateCA() (*x509.Certificate, *rsa.PrivateKey, error) {
-	template := x509.Certificate{
-		SerialNumber: big.NewInt(2019),
-		Subject: pkix.Name{
-			CommonName: "Cockroach Test CA",
-		},
-		NotBefore:             time.Now().Add(-time.Hour),
-		NotAfter:              time.Now().Add(time.Hour),
-		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
-		BasicConstraintsValid: true,
-		IsCA:                  true,
-	}
-
-	caPrivKey, err := rsa.GenerateKey(rand.Reader, 2048)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	caBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, caPrivKey.Public(), caPrivKey)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	caCert, err := x509.ParseCertificate(caBytes)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	return caCert, caPrivKey, nil
-}
-
-func generateNode(caCert *x509.Certificate, caKey *rsa.PrivateKey) ([]byte, []byte, error) {
-	template := x509.Certificate{
-		SerialNumber: big.NewInt(2019),
-		Subject: pkix.Name{
-			CommonName: "node",
-		},
-		DNSNames: []string{"localhost"},
-		IPAddresses: []net.IP{
-			net.IPv4(127, 0, 0, 1),
-			net.IPv6loopback,
-		},
-		NotBefore: time.Now().Add(-time.Hour),
-		NotAfter:  time.Now().Add(time.Hour),
-		KeyUsage:  x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
-		ExtKeyUsage: []x509.ExtKeyUsage{
-			x509.ExtKeyUsageServerAuth,
-			x509.ExtKeyUsageClientAuth,
-		},
-		BasicConstraintsValid: true,
-	}
-
-	certPrivKey, err := rsa.GenerateKey(rand.Reader, 2048)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	certBytes, err := x509.CreateCertificate(rand.Reader, &template, caCert, certPrivKey.Public(), caKey)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	cert := pem.EncodeToMemory(&pem.Block{
-		Type:  "CERTIFICATE",
-		Bytes: certBytes,
-	})
-	certKey := pem.EncodeToMemory(&pem.Block{
-		Type:  "RSA PRIVATE KEY",
-		Bytes: x509.MarshalPKCS1PrivateKey(certPrivKey),
-	})
-
-	return cert, certKey, nil
-}
-
-func generateClient(caCert *x509.Certificate, caKey *rsa.PrivateKey) ([]byte, []byte, error) {
-	template := x509.Certificate{
-		SerialNumber: big.NewInt(2019),
-		Subject: pkix.Name{
-			CommonName: defaultUser,
-		},
-		NotBefore: time.Now().Add(-time.Hour),
-		NotAfter:  time.Now().Add(time.Hour),
-		KeyUsage:  x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
-		ExtKeyUsage: []x509.ExtKeyUsage{
-			x509.ExtKeyUsageServerAuth,
-			x509.ExtKeyUsageClientAuth,
-		},
-		BasicConstraintsValid: true,
-	}
-
-	certPrivKey, err := rsa.GenerateKey(rand.Reader, 2048)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	certBytes, err := x509.CreateCertificate(rand.Reader, &template, caCert, certPrivKey.Public(), caKey)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	cert := pem.EncodeToMemory(&pem.Block{
-		Type:  "CERTIFICATE",
-		Bytes: certBytes,
-	})
-	certKey := pem.EncodeToMemory(&pem.Block{
-		Type:  "RSA PRIVATE KEY",
-		Bytes: x509.MarshalPKCS1PrivateKey(certPrivKey),
-	})
-
-	return cert, certKey, nil
-}

modules/cockroachdb/go.mod

@@ -36,6 +36,7 @@ require (
 	github.com/kr/text v0.2.0 // indirect
 	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mdelapenya/tlscert v0.1.0
 	github.com/moby/patternmatcher v0.6.0 // indirect
 	github.com/moby/sys/sequential v0.5.0 // indirect
 	github.com/moby/sys/user v0.1.0 // indirect

modules/cockroachdb/go.sum

@@ -73,6 +73,8 @@ github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 h1:6E+4a0GO5zZEnZ
 github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0/go.mod h1:zJYVVT2jmtg6P3p1VtQj7WsuWi/y4VnjVBn7F8KPB3I=
 github.com/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0VQdvPDY=
 github.com/magiconair/properties v1.8.7/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0=
+github.com/mdelapenya/tlscert v0.1.0 h1:YTpF579PYUX475eOL+6zyEO3ngLTOUWck78NBuJVXaM=
+github.com/mdelapenya/tlscert v0.1.0/go.mod h1:wrbyM/DwbFCeCeqdPX/8c6hNOqQgbf0rUDErE1uD+64=
 github.com/moby/patternmatcher v0.6.0 h1:GmP9lR19aU5GqSSFko+5pRqHi+Ohk1O69aFiKkVGiPk=
 github.com/moby/patternmatcher v0.6.0/go.mod h1:hDPoyOpDY7OrrMDLaYoY3hf52gNCR/YOUYxkhApJIxc=
 github.com/moby/sys/sequential v0.5.0 h1:OPvI35Lzn9K04PBbCLW0g4LcFAJgHsvXsRyewg5lXtc=

modules/rabbitmq/examples_test.go

@@ -5,9 +5,10 @@ import (
 	"fmt"
 	"io"
 	"log"
-	"path/filepath"
+	"os"
 	"strings"
 
+	"github.com/mdelapenya/tlscert"
 	amqp "github.com/rabbitmq/amqp091-go"
 
 	"github.com/testcontainers/testcontainers-go"
@@ -89,10 +90,39 @@ func ExampleRunContainer_withSSL() {
 	// enableSSL {
 	ctx := context.Background()
 
+	tmpDir := os.TempDir()
+	certDirs := tmpDir + "/rabbitmq"
+	if err := os.MkdirAll(certDirs, 0755); err != nil {
+		log.Fatalf("failed to create temporary directory: %s", err)
+	}
+	defer os.RemoveAll(certDirs)
+
+	// generates the CA certificate and the certificate
+	caCert := tlscert.SelfSignedFromRequest(tlscert.Request{
+		Name:      "ca",
+		Host:      "localhost,127.0.0.1",
+		IsCA:      true,
+		ParentDir: certDirs,
+	})
+	if caCert == nil {
+		log.Fatal("failed to generate CA certificate")
+	}
+
+	cert := tlscert.SelfSignedFromRequest(tlscert.Request{
+		Name:      "client",
+		Host:      "localhost,127.0.0.1",
+		IsCA:      true,
+		Parent:    caCert,
+		ParentDir: certDirs,
+	})
+	if cert == nil {
+		log.Fatal("failed to generate certificate")
+	}
+
 	sslSettings := rabbitmq.SSLSettings{
-		CACertFile:        filepath.Join("testdata", "certs", "server_ca.pem"),
-		CertFile:          filepath.Join("testdata", "certs", "server_cert.pem"),
-		KeyFile:           filepath.Join("testdata", "certs", "server_key.pem"),
+		CACertFile:        caCert.CertPath,
+		CertFile:          cert.CertPath,
+		KeyFile:           cert.KeyPath,
 		VerificationMode:  rabbitmq.SSLVerificationModePeer,
 		FailIfNoCert:      true,
 		VerificationDepth: 1,

modules/rabbitmq/go.mod

@@ -30,6 +30,7 @@ require (
 	github.com/klauspost/compress v1.16.0 // indirect
 	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mdelapenya/tlscert v0.1.0
 	github.com/moby/patternmatcher v0.6.0 // indirect
 	github.com/moby/sys/sequential v0.5.0 // indirect
 	github.com/moby/sys/user v0.1.0 // indirect

modules/rabbitmq/go.sum

@@ -63,6 +63,8 @@ github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 h1:6E+4a0GO5zZEnZ
 github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0/go.mod h1:zJYVVT2jmtg6P3p1VtQj7WsuWi/y4VnjVBn7F8KPB3I=
 github.com/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0VQdvPDY=
 github.com/magiconair/properties v1.8.7/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0=
+github.com/mdelapenya/tlscert v0.1.0 h1:YTpF579PYUX475eOL+6zyEO3ngLTOUWck78NBuJVXaM=
+github.com/mdelapenya/tlscert v0.1.0/go.mod h1:wrbyM/DwbFCeCeqdPX/8c6hNOqQgbf0rUDErE1uD+64=
 github.com/moby/patternmatcher v0.6.0 h1:GmP9lR19aU5GqSSFko+5pRqHi+Ohk1O69aFiKkVGiPk=
 github.com/moby/patternmatcher v0.6.0/go.mod h1:hDPoyOpDY7OrrMDLaYoY3hf52gNCR/YOUYxkhApJIxc=
 github.com/moby/sys/sequential v0.5.0 h1:OPvI35Lzn9K04PBbCLW0g4LcFAJgHsvXsRyewg5lXtc=