How to use altNames method of x509 Package

Best K6 code snippet using x509.altNames

pki_helpers.go

Source:pki_helpers.go Github

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...307 if err != nil {308 return nil, errors.Wrapf(err, "unable to get first IP address from the given CIDR: %v", cfg.Networking.ServiceSubnet)309 }310 // create AltNames with defaults DNSNames/IPs311 altNames := &certutil.AltNames{312 DNSNames: []string{313 cfg.NodeRegistration.Name,314 "kubernetes",315 "kubernetes.default",316 "kubernetes.default.svc",317 fmt.Sprintf("kubernetes.default.svc.%s", cfg.Networking.DNSDomain),318 },319 IPs: []net.IP{320 internalAPIServerVirtualIP,321 advertiseAddress,322 },323 }324 // add cluster controlPlaneEndpoint if present (dns or ip)325 if len(cfg.ControlPlaneEndpoint) > 0 {326 if host, _, err := kubeadmutil.ParseHostPort(cfg.ControlPlaneEndpoint); err == nil {327 if ip := net.ParseIP(host); ip != nil {328 altNames.IPs = append(altNames.IPs, ip)329 } else {330 altNames.DNSNames = append(altNames.DNSNames, host)331 }332 } else {333 return nil, errors.Wrapf(err, "error parsing cluster controlPlaneEndpoint %q", cfg.ControlPlaneEndpoint)334 }335 }336 appendSANsToAltNames(altNames, cfg.APIServer.CertSANs, kubeadmconstants.APIServerCertName)337 return altNames, nil338}339// GetEtcdAltNames builds an AltNames object for generating the etcd server certificate.340// `advertise address` and localhost are included in the SAN since this is the interfaces the etcd static pod listens on.341// The user can override the listen address with `Etcd.ExtraArgs` and add SANs with `Etcd.ServerCertSANs`.342func GetEtcdAltNames(cfg *kubeadmapi.InitConfiguration) (*certutil.AltNames, error) {343 return getAltNames(cfg, kubeadmconstants.EtcdServerCertName)344}345// GetEtcdPeerAltNames builds an AltNames object for generating the etcd peer certificate.346// Hostname and `API.AdvertiseAddress` are included if the user chooses to promote the single node etcd cluster into a multi-node one (stacked etcd).347// The user can override the listen address with `Etcd.ExtraArgs` and add SANs with `Etcd.PeerCertSANs`.348func GetEtcdPeerAltNames(cfg *kubeadmapi.InitConfiguration) (*certutil.AltNames, error) {349 return getAltNames(cfg, kubeadmconstants.EtcdPeerCertName)350}351// getAltNames builds an AltNames object with the cfg and certName.352func getAltNames(cfg *kubeadmapi.InitConfiguration, certName string) (*certutil.AltNames, error) {353 // advertise address354 advertiseAddress := net.ParseIP(cfg.LocalAPIEndpoint.AdvertiseAddress)355 if advertiseAddress == nil {356 return nil, errors.Errorf("error parsing LocalAPIEndpoint AdvertiseAddress %v: is not a valid textual representation of an IP address",357 cfg.LocalAPIEndpoint.AdvertiseAddress)358 }359 // create AltNames with defaults DNSNames/IPs360 altNames := &certutil.AltNames{361 DNSNames: []string{cfg.NodeRegistration.Name, "localhost"},362 IPs: []net.IP{advertiseAddress, net.IPv4(127, 0, 0, 1), net.IPv6loopback},363 }364 if cfg.Etcd.Local != nil {365 if certName == kubeadmconstants.EtcdServerCertName {366 appendSANsToAltNames(altNames, cfg.Etcd.Local.ServerCertSANs, kubeadmconstants.EtcdServerCertName)367 } else if certName == kubeadmconstants.EtcdPeerCertName {368 appendSANsToAltNames(altNames, cfg.Etcd.Local.PeerCertSANs, kubeadmconstants.EtcdPeerCertName)369 }370 }371 return altNames, nil372}373// appendSANsToAltNames parses SANs from as list of strings and adds them to altNames for use on a specific cert374// altNames is passed in with a pointer, and the struct is modified375// valid IP address strings are parsed and added to altNames.IPs as net.IP's376// RFC-1123 compliant DNS strings are added to altNames.DNSNames as strings377// RFC-1123 compliant wildcard DNS strings are added to altNames.DNSNames as strings378// certNames is used to print user facing warnings and should be the name of the cert the altNames will be used for379func appendSANsToAltNames(altNames *certutil.AltNames, SANs []string, certName string) {380 for _, altname := range SANs {381 if ip := net.ParseIP(altname); ip != nil {382 altNames.IPs = append(altNames.IPs, ip)383 } else if len(validation.IsDNS1123Subdomain(altname)) == 0 {384 altNames.DNSNames = append(altNames.DNSNames, altname)385 } else if len(validation.IsWildcardDNS1123Subdomain(altname)) == 0 {386 altNames.DNSNames = append(altNames.DNSNames, altname)387 } else {388 fmt.Printf(389 "[certificates] WARNING: '%s' was not added to the '%s' SAN, because it is not a valid IP or RFC-1123 compliant DNS entry\n",390 altname,391 certName,392 )393 }394 }395}396// EncodeCSRPEM returns PEM-encoded CSR data397func EncodeCSRPEM(csr *x509.CertificateRequest) []byte {398 block := pem.Block{399 Type: certutil.CertificateRequestBlockType,400 Bytes: csr.Raw,401 }402 return pem.EncodeToMemory(&block)403}404func parseCSRPEM(pemCSR []byte) (*x509.CertificateRequest, error) {405 block, _ := pem.Decode(pemCSR)406 if block == nil {407 return nil, errors.New("data doesn't contain a valid certificate request")408 }409 if block.Type != certutil.CertificateRequestBlockType {410 return nil, errors.Errorf("expected block type %q, but PEM had type %q", certutil.CertificateRequestBlockType, block.Type)411 }412 return x509.ParseCertificateRequest(block.Bytes)413}414// CertificateRequestFromFile returns the CertificateRequest from a given PEM-encoded file.415// Returns an error if the file could not be read or if the CSR could not be parsed.416func CertificateRequestFromFile(file string) (*x509.CertificateRequest, error) {417 pemBlock, err := ioutil.ReadFile(file)418 if err != nil {419 return nil, errors.Wrap(err, "failed to read file")420 }421 csr, err := parseCSRPEM(pemBlock)422 if err != nil {423 return nil, errors.Wrapf(err, "error reading certificate request file %s", file)424 }425 return csr, nil426}427// NewCSR creates a new CSR428func NewCSR(cfg CertConfig, key crypto.Signer) (*x509.CertificateRequest, error) {429 template := &x509.CertificateRequest{430 Subject: pkix.Name{431 CommonName: cfg.CommonName,432 Organization: cfg.Organization,433 },434 DNSNames: cfg.AltNames.DNSNames,435 IPAddresses: cfg.AltNames.IPs,436 }437 csrBytes, err := x509.CreateCertificateRequest(cryptorand.Reader, template, key)438 if err != nil {439 return nil, errors.Wrap(err, "failed to create a CSR")440 }441 return x509.ParseCertificateRequest(csrBytes)442}443// EncodeCertPEM returns PEM-endcoded certificate data444func EncodeCertPEM(cert *x509.Certificate) []byte {445 block := pem.Block{446 Type: CertificateBlockType,447 Bytes: cert.Raw,448 }449 return pem.EncodeToMemory(&block)450}451// EncodePublicKeyPEM returns PEM-encoded public data452func EncodePublicKeyPEM(key crypto.PublicKey) ([]byte, error) {453 der, err := x509.MarshalPKIXPublicKey(key)454 if err != nil {455 return []byte{}, err456 }457 block := pem.Block{458 Type: PublicKeyBlockType,459 Bytes: der,460 }461 return pem.EncodeToMemory(&block), nil462}463// NewPrivateKey creates an RSA private key464func NewPrivateKey(keyType x509.PublicKeyAlgorithm) (crypto.Signer, error) {465 if keyType == x509.ECDSA {466 return ecdsa.GenerateKey(elliptic.P256(), cryptorand.Reader)467 }468 return rsa.GenerateKey(cryptorand.Reader, rsaKeySize)469}470// NewSignedCert creates a signed certificate using the given CA certificate and key471func NewSignedCert(cfg *CertConfig, key crypto.Signer, caCert *x509.Certificate, caKey crypto.Signer) (*x509.Certificate, error) {472 serial, err := cryptorand.Int(cryptorand.Reader, new(big.Int).SetInt64(math.MaxInt64))473 if err != nil {474 return nil, err475 }476 if len(cfg.CommonName) == 0 {477 return nil, errors.New("must specify a CommonName")478 }479 if len(cfg.Usages) == 0 {480 return nil, errors.New("must specify at least one ExtKeyUsage")481 }482 RemoveDuplicateAltNames(&cfg.AltNames)483 certTmpl := x509.Certificate{484 Subject: pkix.Name{485 CommonName: cfg.CommonName,486 Organization: cfg.Organization,487 },488 DNSNames: cfg.AltNames.DNSNames,489 IPAddresses: cfg.AltNames.IPs,490 SerialNumber: serial,491 NotBefore: caCert.NotBefore,492 NotAfter: time.Now().Add(kubeadmconstants.CertificateValidity).UTC(),493 KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,494 ExtKeyUsage: cfg.Usages,495 }496 certDERBytes, err := x509.CreateCertificate(cryptorand.Reader, &certTmpl, caCert, key.Public(), caKey)497 if err != nil {498 return nil, err499 }500 return x509.ParseCertificate(certDERBytes)501}502// RemoveDuplicateAltNames removes duplicate items in altNames.503func RemoveDuplicateAltNames(altNames *certutil.AltNames) {504 if altNames == nil {505 return506 }507 if altNames.DNSNames != nil {508 altNames.DNSNames = sets.NewString(altNames.DNSNames...).List()509 }510 ipsKeys := make(map[string]struct{})511 var ips []net.IP512 for _, one := range altNames.IPs {513 if _, ok := ipsKeys[one.String()]; !ok {514 ipsKeys[one.String()] = struct{}{}515 ips = append(ips, one)516 }517 }518 altNames.IPs = ips519}...

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manager_test.go

Source:manager_test.go Github

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1/*2Copyright 2019 The Kubernetes Authors.3Licensed under the Apache License, Version 2.0 (the "License");4you may not use this file except in compliance with the License.5You may obtain a copy of the License at6 http://www.apache.org/licenses/LICENSE-2.07Unless required by applicable law or agreed to in writing, software8distributed under the License is distributed on an "AS IS" BASIS,9WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.10See the License for the specific language governing permissions and11limitations under the License.12*/13package renewal14import (15 "crypto/x509"16 "crypto/x509/pkix"17 "fmt"18 "net"19 "os"20 "path/filepath"21 "testing"22 "time"23 certutil "k8s.io/client-go/util/cert"24 kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"25 certtestutil "k8s.io/kubernetes/cmd/kubeadm/app/util/certs"26 "k8s.io/kubernetes/cmd/kubeadm/app/util/pkiutil"27 testutil "k8s.io/kubernetes/cmd/kubeadm/test"28)29var (30 testCACertCfg = &pkiutil.CertConfig{31 Config: certutil.Config{CommonName: "kubernetes"},32 }33 testCACert, testCAKey, _ = pkiutil.NewCertificateAuthority(testCACertCfg)34 testCertCfg = &pkiutil.CertConfig{35 Config: certutil.Config{36 CommonName: "test-common-name",37 Organization: []string{"sig-cluster-lifecycle"},38 AltNames: certutil.AltNames{39 IPs: []net.IP{net.ParseIP("10.100.0.1")},40 DNSNames: []string{"test-domain.space"},41 },42 Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},43 },44 }45)46func TestNewManager(t *testing.T) {47 tests := []struct {48 name string49 cfg *kubeadmapi.ClusterConfiguration50 expectedCertificates int51 }{52 {53 name: "cluster with local etcd",54 cfg: &kubeadmapi.ClusterConfiguration{},55 expectedCertificates: 10, //[admin apiserver apiserver-etcd-client apiserver-kubelet-client controller-manager etcd/healthcheck-client etcd/peer etcd/server front-proxy-client scheduler]56 },57 {58 name: "cluster with external etcd",59 cfg: &kubeadmapi.ClusterConfiguration{60 Etcd: kubeadmapi.Etcd{61 External: &kubeadmapi.ExternalEtcd{},62 },63 },64 expectedCertificates: 6, // [admin apiserver apiserver-kubelet-client controller-manager front-proxy-client scheduler]65 },66 }67 for _, test := range tests {68 t.Run(test.name, func(t *testing.T) {69 rm, err := NewManager(test.cfg, "")70 if err != nil {71 t.Fatalf("Failed to create the certificate renewal manager: %v", err)72 }73 if len(rm.Certificates()) != test.expectedCertificates {74 t.Errorf("Expected %d certificates, saw %d", test.expectedCertificates, len(rm.Certificates()))75 }76 })77 }78}79func TestRenewUsingLocalCA(t *testing.T) {80 dir := testutil.SetupTempDir(t)81 defer os.RemoveAll(dir)82 if err := pkiutil.WriteCertAndKey(dir, "ca", testCACert, testCAKey); err != nil {83 t.Fatalf("couldn't write out CA certificate to %s", dir)84 }85 cfg := &kubeadmapi.ClusterConfiguration{86 CertificatesDir: dir,87 }88 rm, err := NewManager(cfg, dir)89 if err != nil {90 t.Fatalf("Failed to create the certificate renewal manager: %v", err)91 }92 tests := []struct {93 name string94 certName string95 createCertFunc func() *x509.Certificate96 }{97 {98 name: "Certificate renewal for a PKI certificate",99 certName: "apiserver",100 createCertFunc: func() *x509.Certificate {101 return writeTestCertificate(t, dir, "apiserver", testCACert, testCAKey)102 },103 },104 {105 name: "Certificate renewal for a certificate embedded in a kubeconfig file",106 certName: "admin.conf",107 createCertFunc: func() *x509.Certificate {108 return writeTestKubeconfig(t, dir, "admin.conf", testCACert, testCAKey)109 },110 },111 }112 for _, test := range tests {113 t.Run(test.name, func(t *testing.T) {114 cert := test.createCertFunc()115 time.Sleep(1 * time.Second)116 _, err := rm.RenewUsingLocalCA(test.certName)117 if err != nil {118 t.Fatalf("error renewing certificate: %v", err)119 }120 newCert, err := rm.certificates[test.certName].readwriter.Read()121 if err != nil {122 t.Fatalf("error reading renewed certificate: %v", err)123 }124 if newCert.SerialNumber.Cmp(cert.SerialNumber) == 0 {125 t.Fatal("expected new certificate, but renewed certificate has same serial number")126 }127 if !newCert.NotAfter.After(cert.NotAfter) {128 t.Fatalf("expected new certificate with updated expiration, but renewed certificate has same NotAfter value: saw %s, expected greather than %s", newCert.NotAfter, cert.NotAfter)129 }130 certtestutil.AssertCertificateIsSignedByCa(t, newCert, testCACert)131 certtestutil.AssertCertificateHasClientAuthUsage(t, newCert)132 certtestutil.AssertCertificateHasOrganizations(t, newCert, testCertCfg.Organization...)133 certtestutil.AssertCertificateHasCommonName(t, newCert, testCertCfg.CommonName)134 certtestutil.AssertCertificateHasDNSNames(t, newCert, testCertCfg.AltNames.DNSNames...)135 certtestutil.AssertCertificateHasIPAddresses(t, newCert, testCertCfg.AltNames.IPs...)136 })137 }138}139func TestCreateRenewCSR(t *testing.T) {140 dir := testutil.SetupTempDir(t)141 defer os.RemoveAll(dir)142 outdir := filepath.Join(dir, "out")143 if err := os.MkdirAll(outdir, 0755); err != nil {144 t.Fatalf("couldn't create %s", outdir)145 }146 if err := pkiutil.WriteCertAndKey(dir, "ca", testCACert, testCAKey); err != nil {147 t.Fatalf("couldn't write out CA certificate to %s", dir)148 }149 cfg := &kubeadmapi.ClusterConfiguration{150 CertificatesDir: dir,151 }152 rm, err := NewManager(cfg, dir)153 if err != nil {154 t.Fatalf("Failed to create the certificate renewal manager: %v", err)155 }156 tests := []struct {157 name string158 certName string159 createCertFunc func() *x509.Certificate160 }{161 {162 name: "Creation of a CSR request for renewal of a PKI certificate",163 certName: "apiserver",164 createCertFunc: func() *x509.Certificate {165 return writeTestCertificate(t, dir, "apiserver", testCACert, testCAKey)166 },167 },168 {169 name: "Creation of a CSR request for renewal of a certificate embedded in a kubeconfig file",170 certName: "admin.conf",171 createCertFunc: func() *x509.Certificate {172 return writeTestKubeconfig(t, dir, "admin.conf", testCACert, testCAKey)173 },174 },175 }176 for _, test := range tests {177 t.Run(test.name, func(t *testing.T) {178 test.createCertFunc()179 time.Sleep(1 * time.Second)180 err := rm.CreateRenewCSR(test.certName, outdir)181 if err != nil {182 t.Fatalf("error renewing certificate: %v", err)183 }184 file := fmt.Sprintf("%s.key", test.certName)185 if _, err := os.Stat(filepath.Join(outdir, file)); os.IsNotExist(err) {186 t.Errorf("Expected file %s does not exist", file)187 }188 file = fmt.Sprintf("%s.csr", test.certName)189 if _, err := os.Stat(filepath.Join(outdir, file)); os.IsNotExist(err) {190 t.Errorf("Expected file %s does not exist", file)191 }192 })193 }194}195func TestCertToConfig(t *testing.T) {196 expectedConfig := &certutil.Config{197 CommonName: "test-common-name",198 Organization: []string{"sig-cluster-lifecycle"},199 AltNames: certutil.AltNames{200 IPs: []net.IP{net.ParseIP("10.100.0.1")},201 DNSNames: []string{"test-domain.space"},202 },203 Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},204 }205 cert := &x509.Certificate{206 Subject: pkix.Name{207 CommonName: "test-common-name",208 Organization: []string{"sig-cluster-lifecycle"},209 },210 ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},211 DNSNames: []string{"test-domain.space"},212 IPAddresses: []net.IP{net.ParseIP("10.100.0.1")},213 }214 cfg := certToConfig(cert)215 if cfg.CommonName != expectedConfig.CommonName {216 t.Errorf("expected common name %q, got %q", expectedConfig.CommonName, cfg.CommonName)217 }218 if len(cfg.Organization) != 1 || cfg.Organization[0] != expectedConfig.Organization[0] {219 t.Errorf("expected organization %v, got %v", expectedConfig.Organization, cfg.Organization)220 }221 if len(cfg.Usages) != 1 || cfg.Usages[0] != expectedConfig.Usages[0] {222 t.Errorf("expected ext key usage %v, got %v", expectedConfig.Usages, cfg.Usages)223 }224 if len(cfg.AltNames.IPs) != 1 || cfg.AltNames.IPs[0].String() != expectedConfig.AltNames.IPs[0].String() {225 t.Errorf("expected SAN IPs %v, got %v", expectedConfig.AltNames.IPs, cfg.AltNames.IPs)226 }227 if len(cfg.AltNames.DNSNames) != 1 || cfg.AltNames.DNSNames[0] != expectedConfig.AltNames.DNSNames[0] {228 t.Errorf("expected SAN DNSNames %v, got %v", expectedConfig.AltNames.DNSNames, cfg.AltNames.DNSNames)229 }230}...

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tls_util.go

Source:tls_util.go Github

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...42 IPs []net.IP43}44// NewAltNames parses given addrs into either ip or dns name, and returns Altnames for them.45func NewAltNames(addrs []string) AltNames {46 var altNames AltNames47 for _, addr := range addrs {48 if ip := net.ParseIP(addr); ip != nil {49 altNames.IPs = append(altNames.IPs, ip)50 } else {51 altNames.DNSNames = append(altNames.DNSNames, addr)52 }53 }54 return altNames55}56// NewPrivateKey returns randomly generated RSA private key.57func NewPrivateKey() (*rsa.PrivateKey, error) {58 return rsa.GenerateKey(rand.Reader, rsaKeySize)59}60// EncodePublicKeyPEM encodes the given public key pem and returns bytes (base64).61func EncodePublicKeyPEM(key *rsa.PublicKey) ([]byte, error) {62 der, err := x509.MarshalPKIXPublicKey(key)63 if err != nil {64 return []byte{}, err65 }66 block := pem.Block{67 Type: "PUBLIC KEY",68 Bytes: der,...

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altNames

Using AI Code Generation

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1import (2func main() {3 cert, err := ioutil.ReadFile("cert.pem")4 if err != nil {5 fmt.Println("Error reading file")6 }7 block, _ := pem.Decode(cert)8 if block == nil {9 fmt.Println("Error decoding cert")10 }11 x509cert, err := x509.ParseCertificate(block.Bytes)12 if err != nil {13 fmt.Println("Error parsing cert")14 }15 fmt.Println(x509cert.DNSNames)16}

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altNames

Using AI Code Generation

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1import (2func main() {3 cert, err := ioutil.ReadFile("cert.pem")4 if err != nil {5 fmt.Println("Error reading file:", err)6 }7 block, _ := pem.Decode(cert)8 if block == nil {9 fmt.Println("Error decoding PEM file")10 }11 x509cert, err := x509.ParseCertificate(block.Bytes)12 if err != nil {13 fmt.Println("Error parsing X509 cert:", err)14 }15 fmt.Println(x509cert.DNSNames)16}17import (18func main() {19 cert, err := ioutil.ReadFile("cert.pem")20 if err != nil {21 fmt.Println("Error reading file:", err)22 }23 block, _ := pem.Decode(cert)24 if block == nil {25 fmt.Println("Error decoding PEM file")26 }27 x509cert, err := x509.ParseCertificate(block.Bytes)28 if err != nil {29 fmt.Println("Error parsing X509 cert:", err)30 }31 var SAN struct {32 }33 _, err = asn1.Unmarshal(x509cert.Extensions[0].Value, &SAN)34 if err != nil {35 fmt.Println("Error parsing subject alternate name:", err)36 }37 fmt.Println(SAN.Names)38}39import (40func main() {41 cert, err := ioutil.ReadFile("cert.pem")42 if err != nil {43 fmt.Println("Error reading file:", err)44 }45 block, _ := pem.Decode(cert)46 if block == nil {47 fmt.Println("Error decoding PEM file")48 }49 x509cert, err := x509.ParseCertificate(block.Bytes)50 if err != nil {

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altNames

Using AI Code Generation

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1CertificateFactory cf = CertificateFactory.getInstance("X.509");2InputStream caInput = new BufferedInputStream(new FileInputStream("ca.crt"));3Certificate ca;4try {5 ca = cf.generateCertificate(caInput);6 System.out.println("ca=" + ((X509Certificate) ca).getSubjectDN());7} finally {8 caInput.close();9}10CertificateFactory cf = CertificateFactory.getInstance("X.509");11InputStream caInput = new BufferedInputStream(new FileInputStream("ca.crt"));12Certificate ca;13try {14 ca = cf.generateCertificate(caInput);15 System.out.println("ca=" + ((X509Certificate) ca).getSubjectDN());16} finally {17 caInput.close();18}19CertificateFactory cf = CertificateFactory.getInstance("X.509");20InputStream caInput = new BufferedInputStream(new FileInputStream("ca.crt"));21Certificate ca;22try {23 ca = cf.generateCertificate(caInput);24 System.out.println("ca=" + ((X509Certificate) ca).getSubjectDN());25} finally {26 caInput.close();27}28CertificateFactory cf = CertificateFactory.getInstance("X.509");29InputStream caInput = new BufferedInputStream(new FileInputStream("ca.crt"));30Certificate ca;31try {32 ca = cf.generateCertificate(caInput);33 System.out.println("ca=" + ((X509Certificate) ca).getSubjectDN());34} finally {35 caInput.close();36}37CertificateFactory cf = CertificateFactory.getInstance("X.509");38InputStream caInput = new BufferedInputStream(new FileInputStream("ca.crt"));39Certificate ca;40try {41 ca = cf.generateCertificate(caInput);42 System.out.println("ca=" + ((X509Certificate) ca).getSubjectDN());43} finally {44 caInput.close();45}46CertificateFactory cf = CertificateFactory.getInstance("X.509");47InputStream caInput = new BufferedInputStream(new FileInputStream("ca.crt"));48Certificate ca;49try {50 ca = cf.generateCertificate(caInput);51 System.out.println("ca=" + ((X509Certificate) ca).getSubjectDN());52} finally {53 caInput.close();54}

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altNames

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1import (2func main() {3 cert, err := x509.ParseCertificate(certFile)4 if err != nil {5 fmt.Println("Error parsing certificate:", err)6 os.Exit(1)7 }8 fmt.Println(cert.DNSNames)9}

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altNames

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1import (2func main() {3 certPEMBlock, err := ioutil.ReadFile("/etc/ssl/certs/ssl-cert-snakeoil.pem")4 if err != nil {5 fmt.Println("Error reading file")6 }7 certDERBlock, _ := pem.Decode(certPEMBlock)8 cert, err := x509.ParseCertificate(certDERBlock.Bytes)9 if err != nil {10 fmt.Println("Error parsing certificate")11 }12 fmt.Println(cert.DNSNames)13}14import (15func main() {16 certPEMBlock, err := ioutil.ReadFile("/etc/ssl/certs/ssl-cert-snakeoil.pem")17 if err != nil {18 fmt.Println("Error reading file")19 }20 certDERBlock, _ := pem.Decode(certPEMBlock)21 cert, err := x509.ParseCertificate(certDERBlock.Bytes)22 if err != nil {23 fmt.Println("Error parsing certificate")24 }25 fmt.Println(cert.Subject.CommonName)26}27import (28func main() {29 certPEMBlock, err := ioutil.ReadFile("/etc/ssl/certs/ssl-cert-snakeoil.pem")30 if err != nil {31 fmt.Println("Error reading file")32 }33 certDERBlock, _ := pem.Decode(certPEMBlock)34 cert, err := x509.ParseCertificate(certDERBlock.Bytes)35 if err != nil {36 fmt.Println("Error parsing certificate")37 }38 fmt.Println(cert.Subject.CommonName)39}40import (41func main() {42 certPEMBlock, err := ioutil.ReadFile("/etc/ssl/certs/ssl-cert-snakeoil.pem")43 if err != nil {44 fmt.Println("Error reading file")45 }

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altNames

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1import (2func main() {3 certPool := x509.NewCertPool()4 cert, err := ioutil.ReadFile("cert.pem")5 if err != nil {6 log.Fatal(err)7 }8 certPool.AppendCertsFromPEM(cert)9 client := &http.Client{10 Transport: &http.Transport{11 TLSClientConfig: &tls.Config{12 },13 },14 }15 if err != nil {16 log.Fatal(err)17 }18 defer resp.Body.Close()19 body, err := ioutil.ReadAll(resp.Body)20 if err != nil {21 log.Fatal(err)22 }23 fmt.Println(string(body))24}25import (26func main() {27 certPool := x509.NewCertPool()28 cert, err := ioutil.ReadFile("cert.pem")29 if err != nil {30 log.Fatal(err)31 }32 certPool.AppendCertsFromPEM(cert)33 client := &http.Client{34 Transport: &http.Transport{35 TLSClientConfig: &tls.Config{36 },37 },38 }39 if err != nil {40 log.Fatal(err)41 }42 defer resp.Body.Close()43 body, err := ioutil.ReadAll(resp.Body)44 if err != nil {45 log.Fatal(err)46 }47 fmt.Println(string(body))48}49import (50func main() {

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altNames

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1import "crypto/x509"2import "fmt"3import "encoding/pem"4import "os"5func main() {6 certPEMBlock, err := os.ReadFile(certFile)7 if err != nil {8 panic(err)9 }10 certDERBlock, _ := pem.Decode(certPEMBlock)11 if certDERBlock == nil {12 panic("failed to parse certificate PEM")13 }14 cert, err := x509.ParseCertificate(certDERBlock.Bytes)15 if err != nil {16 panic(err)17 }18 fmt.Println(cert.DNSNames)19 fmt.Println(cert.IPAddresses)20 fmt.Println(cert.EmailAddresses)21}

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