Update dependency go to v1.24.6

Co-authored-by: renovate-rancher[bot] <119870437+renovate-rancher[bot]@users.noreply.github.com>

.github/renovate.json

@@ -0,0 +1,32 @@
+{
+  "extends": [
+    "github>rancher/renovate-config#release"
+  ],
+  "baseBranches": [
+    "main",
+    "release/v0.3",
+    "release/v0.4",
+    "release/v0.5"
+  ],
+  "prHourlyLimit": 2,
+  "packageRules": [
+    {
+      "enabled": false,
+      "matchPackageNames": [
+        "/k8s.io/*/",
+        "/sigs.k8s.io/*/",
+        "/github.com/prometheus/*/"
+      ]
+    },
+    {
+      "matchUpdateTypes": [
+        "major",
+        "minor"
+      ],
+      "enabled": false,
+      "matchPackageNames": [
+        "/github.com/rancher/wrangler/*/"
+      ]
+    }
+  ]
+}

.github/workflows/ci.yaml

@@ -0,0 +1,20 @@
+name: CI
+on:
+  pull_request:
+  push:
+    branches:
+    - 'master'
+    - 'release/*'
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      # https://github.com/actions/checkout/releases/tag/VERSION
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+    - name: Install Go
+      # https://github.com/actions/setup-go/releases/tag/VERSION
+      uses: actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5 # v5.5.0
+      with:
+        go-version-file: 'go.mod'
+    - run: go test -v -race -cover ./...

.github/workflows/release.yaml

@@ -0,0 +1,25 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - v*
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name : Checkout repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Create release on Github
+        run: |
+          if [[ "${{ github.ref_name }}" == *-rc* ]]; then
+            gh --repo "${{ github.repository }}" release create ${{ github.ref_name }} --verify-tag --generate-notes --prerelease
+          else
+            gh --repo "${{ github.repository }}" release create ${{ github.ref_name }} --verify-tag --generate-notes
+          fi
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/renovate-vault.yml

@@ -0,0 +1,29 @@
+name: Renovate
+on:
+  workflow_dispatch:
+    inputs:
+      logLevel:
+        description: "Override default log level"
+        required: false
+        default: "info"
+        type: string
+      overrideSchedule:
+        description: "Override all schedules"
+        required: false
+        default: "false"
+        type: string
+  # Run twice in the early morning (UTC) for initial and follow up steps (create pull request and merge)
+  schedule:
+    - cron: '30 4,6 * * *'
+
+permissions:
+  contents: read
+  id-token: write
+
+jobs:
+  call-workflow:
+    uses: rancher/renovate-config/.github/workflows/renovate-vault.yml@release
+    with:
+      logLevel: ${{ inputs.logLevel || 'info' }}
+      overrideSchedule: ${{ github.event.inputs.overrideSchedule == 'true' && '{''schedule'':null}' || '' }}
+    secrets: inherit

README.md

@@ -0,0 +1,16 @@
+# [dynamiclistener](https://github.com/rancher/dynamiclistener)
+
+DynamicListener allows you to setup a server with automatically generated (and re-generated) TLS certs with kubernetes secrets integration.
+
+This `README` is a work in progress; aimed towards providing information for navigating the contents of this repository.
+
+## Changing the Expiration Days for Newly Signed Certificates
+
+By default, a newly signed certificate is set to expire 365 days (1 year) after its creation time and date.
+You can use the `CATTLE_NEW_SIGNED_CERT_EXPIRATION_DAYS` environment variable to change this value.
+
+**Please note:** the value for the aforementioned variable must be a string representing an unsigned integer corresponding to the number of days until expiration (i.e. X509 "NotAfter" value).
+
+# Versioning
+
+See [VERSION.md](VERSION.md).

VERSION.md

@@ -0,0 +1,11 @@
+DynamicListener follows a pre-release (v0.x) strategy of semver. There is limited compatibility between releases, though we do aim to avoid breaking changes on minor version lines. DynamicListener aims to support a limited set of Kubernetes minor versions (all values below are inclusive in start and end). The current supported versions of DynamicListener are as follows:
+
+The current supported release lines are:
+
+| DynamicListener Branch | DynamicListener Minor version | Kubernetes Version Range | Wrangler Version |
+|------------------------|-------------------------------|--------------------------|------------------------------------------------|
+| main | v0.7 | v1.27+ | v3 |
+| release/v0.6 | v0.6 | v1.27 - v1.32 | v3 |
+| release/v0.5 | v0.5 | v1.26 - v1.30 | v3 |
+| release/v0.4 | v0.4 | v1.25 - v1.28 | v2 |
+| release/v0.3 | v0.3 | v1.23 - v1.27 | v2 |

cert/cert.go

@@ -33,7 +33,9 @@ import (
 	"math"
 	"math/big"
 	"net"
+	"os"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"time"
 
@@ -45,12 +47,15 @@ const (
 	duration365d = time.Hour * 24 * 365
 )
 
-// Config contains the basic fields required for creating a certificate
+var ErrStaticCert = errors.New("cannot renew static certificate")
+
+// Config contains the basic fields required for creating a certificate.
 type Config struct {
 	CommonName   string
 	Organization []string
 	AltNames     AltNames
 	Usages       []x509.ExtKeyUsage
+	ExpiresAt    time.Duration
 }
 
 // AltNames contains the domain names and IP addresses that will be added
@@ -86,10 +91,15 @@ func NewSelfSignedCACert(cfg Config, key crypto.Signer) (*x509.Certificate, erro
 	if err != nil {
 		return nil, err
 	}
+
+	logrus.Infof("generated self-signed CA certificate %s: notBefore=%s notAfter=%s",
+		tmpl.Subject, tmpl.NotBefore, tmpl.NotAfter)
+
 	return x509.ParseCertificate(certDERBytes)
 }
 
-// NewSignedCert creates a signed certificate using the given CA certificate and key
+// NewSignedCert creates a signed certificate using the given CA certificate and key based
+// on the given configuration.
 func NewSignedCert(cfg Config, key crypto.Signer, caCert *x509.Certificate, caKey crypto.Signer) (*x509.Certificate, error) {
 	serial, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
 	if err != nil {
@@ -101,6 +111,19 @@ func NewSignedCert(cfg Config, key crypto.Signer, caCert *x509.Certificate, caKe
 	if len(cfg.Usages) == 0 {
 		return nil, errors.New("must specify at least one ExtKeyUsage")
 	}
+	expiresAt := duration365d
+	if cfg.ExpiresAt > 0 {
+		expiresAt = time.Duration(cfg.ExpiresAt)
+	} else {
+		envExpirationDays := os.Getenv("CATTLE_NEW_SIGNED_CERT_EXPIRATION_DAYS")
+		if envExpirationDays != "" {
+			if envExpirationDaysInt, err := strconv.Atoi(envExpirationDays); err != nil {
+				logrus.Infof("[NewSignedCert] expiration days from ENV (%s) could not be converted to int (falling back to default value: %d)", envExpirationDays, expiresAt)
+			} else {
+				expiresAt = time.Hour * 24 * time.Duration(envExpirationDaysInt)
+			}
+		}
+	}
 
 	certTmpl := x509.Certificate{
 		Subject: pkix.Name{
@@ -111,7 +134,7 @@ func NewSignedCert(cfg Config, key crypto.Signer, caCert *x509.Certificate, caKe
 		IPAddresses:  cfg.AltNames.IPs,
 		SerialNumber: serial,
 		NotBefore:    caCert.NotBefore,
-		NotAfter:     time.Now().Add(duration365d).UTC(),
+		NotAfter:     time.Now().Add(expiresAt).UTC(),
 		KeyUsage:     x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
 		ExtKeyUsage:  cfg.Usages,
 	}
@@ -119,7 +142,13 @@ func NewSignedCert(cfg Config, key crypto.Signer, caCert *x509.Certificate, caKe
 	if err != nil {
 		return nil, err
 	}
-	return x509.ParseCertificate(certDERBytes)
+
+	parsedCert, err := x509.ParseCertificate(certDERBytes)
+	if err == nil {
+		logrus.Infof("certificate %s signed by %s: notBefore=%s notAfter=%s",
+			parsedCert.Subject, caCert.Subject, parsedCert.NotBefore, parsedCert.NotAfter)
+	}
+	return parsedCert, err
 }
 
 // MakeEllipticPrivateKeyPEM creates an ECDSA private key
@@ -271,11 +300,11 @@ func ipsToStrings(ips []net.IP) []string {
 }
 
 // IsCertExpired checks if the certificate about to expire
-func IsCertExpired(cert *x509.Certificate) bool {
+func IsCertExpired(cert *x509.Certificate, days int) bool {
 	expirationDate := cert.NotAfter
-	diffDays := expirationDate.Sub(time.Now()).Hours() / 24.0
-	if diffDays <= 90 {
-		logrus.Infof("certificate will expire in %f days", diffDays)
+	diffDays := time.Until(expirationDate).Hours() / 24.0
+	if diffDays <= float64(days) {
+		logrus.Infof("certificate %s will expire in %f days at %s", cert.Subject, diffDays, cert.NotAfter)
 		return true
 	}
 	return false

cert/io.go

@@ -34,15 +34,15 @@ func CanReadCertAndKey(certPath, keyPath string) (bool, error) {
 	certReadable := canReadFile(certPath)
 	keyReadable := canReadFile(keyPath)
 
-	if certReadable == false && keyReadable == false {
+	if !certReadable && !keyReadable {
 		return false, nil
 	}
 
-	if certReadable == false {
+	if !certReadable {
 		return false, fmt.Errorf("error reading %s, certificate and key must be supplied as a pair", certPath)
 	}
 
-	if keyReadable == false {
+	if !keyReadable {
 		return false, fmt.Errorf("error reading %s, certificate and key must be supplied as a pair", keyPath)
 	}
 

cert/secret.go

@@ -0,0 +1,16 @@
+package cert
+
+import v1 "k8s.io/api/core/v1"
+
+func IsValidTLSSecret(secret *v1.Secret) bool {
+	if secret == nil {
+		return false
+	}
+	if _, ok := secret.Data[v1.TLSCertKey]; !ok {
+		return false
+	}
+	if _, ok := secret.Data[v1.TLSPrivateKeyKey]; !ok {
+		return false
+	}
+	return true
+}

factory/ca.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"time"
 
 	"github.com/rancher/dynamiclistener/cert"
 )
@@ -16,7 +17,7 @@ func GenCA() (*x509.Certificate, crypto.Signer, error) {
 		return nil, nil, err
 	}
 
-	caCert, err := NewSelfSignedCACert(caKey, "dynamiclistener-ca", "dynamiclistener-org")
+	caCert, err := NewSelfSignedCACert(caKey, fmt.Sprintf("dynamiclistener-ca@%d", time.Now().Unix()), "dynamiclistener-org")
 	if err != nil {
 		return nil, nil, err
 	}
@@ -24,18 +25,28 @@ func GenCA() (*x509.Certificate, crypto.Signer, error) {
 	return caCert, caKey, nil
 }
 
+// Deprecated: Use LoadOrGenCAChain instead as it supports intermediate CAs
 func LoadOrGenCA() (*x509.Certificate, crypto.Signer, error) {
-	cert, key, err := loadCA()
-	if err == nil {
-		return cert, key, nil
-	}
-
-	cert, key, err = GenCA()
+	chain, signer, err := LoadOrGenCAChain()
 	if err != nil {
 		return nil, nil, err
 	}
+	return chain[0], signer, err
+}
 
-	certBytes, keyBytes, err := Marshal(cert, key)
+func LoadOrGenCAChain() ([]*x509.Certificate, crypto.Signer, error) {
+	certs, key, err := loadCA()
+	if err == nil {
+		return certs, key, nil
+	}
+
+	cert, key, err := GenCA()
+	if err != nil {
+		return nil, nil, err
+	}
+	certs = []*x509.Certificate{cert}
+
+	certBytes, keyBytes, err := MarshalChain(key, certs...)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -52,14 +63,22 @@ func LoadOrGenCA() (*x509.Certificate, crypto.Signer, error) {
 		return nil, nil, err
 	}
 
-	return cert, key, nil
+	return certs, key, nil
 }
 
-func loadCA() (*x509.Certificate, crypto.Signer, error) {
-	return LoadCerts("./certs/ca.pem", "./certs/ca.key")
+func loadCA() ([]*x509.Certificate, crypto.Signer, error) {
+	return LoadCertsChain("./certs/ca.pem", "./certs/ca.key")
 }
 
 func LoadCA(caPem, caKey []byte) (*x509.Certificate, crypto.Signer, error) {
+	chain, signer, err := LoadCAChain(caPem, caKey)
+	if err != nil {
+		return nil, nil, err
+	}
+	return chain[0], signer, nil
+}
+
+func LoadCAChain(caPem, caKey []byte) ([]*x509.Certificate, crypto.Signer, error) {
 	key, err := cert.ParsePrivateKeyPEM(caKey)
 	if err != nil {
 		return nil, nil, err
@@ -69,15 +88,24 @@ func LoadCA(caPem, caKey []byte) (*x509.Certificate, crypto.Signer, error) {
 		return nil, nil, fmt.Errorf("key is not a crypto.Signer")
 	}
 
-	cert, err := ParseCertPEM(caPem)
+	certs, err := cert.ParseCertsPEM(caPem)
 	if err != nil {
 		return nil, nil, err
 	}
 
-	return cert, signer, nil
+	return certs, signer, nil
 }
 
+// Deprecated: Use LoadCertsChain instead as it supports intermediate CAs
 func LoadCerts(certFile, keyFile string) (*x509.Certificate, crypto.Signer, error) {
+	chain, signer, err := LoadCertsChain(certFile, keyFile)
+	if err != nil {
+		return nil, nil, err
+	}
+	return chain[0], signer, err
+}
+
+func LoadCertsChain(certFile, keyFile string) ([]*x509.Certificate, crypto.Signer, error) {
 	caPem, err := ioutil.ReadFile(certFile)
 	if err != nil {
 		return nil, nil, err
@@ -87,5 +115,5 @@ func LoadCerts(certFile, keyFile string) (*x509.Certificate, crypto.Signer, erro
 		return nil, nil, err
 	}
 
-	return LoadCA(caPem, caKey)
+	return LoadCAChain(caPem, caKey)
 }

factory/cert_utils.go

@@ -10,11 +10,17 @@ import (
 	"math"
 	"math/big"
 	"net"
+	"os"
+	"strconv"
+	"strings"
 	"time"
+
+	"github.com/sirupsen/logrus"
 )
 
 const (
-	CertificateBlockType = "CERTIFICATE"
+	CertificateBlockType               = "CERTIFICATE"
+	defaultNewSignedCertExpirationDays = 365
 )
 
 func NewSelfSignedCACert(key crypto.Signer, cn string, org ...string) (*x509.Certificate, error) {
@@ -37,6 +43,9 @@ func NewSelfSignedCACert(key crypto.Signer, cn string, org ...string) (*x509.Cer
 		return nil, err
 	}
 
+	logrus.Infof("generated self-signed CA certificate %s: notBefore=%s notAfter=%s",
+		tmpl.Subject, tmpl.NotBefore, tmpl.NotAfter)
+
 	return x509.ParseCertificate(certDERBytes)
 }
 
@@ -57,6 +66,12 @@ func NewSignedClientCert(signer crypto.Signer, caCert *x509.Certificate, caKey c
 		},
 	}
 
+	parts := strings.Split(cn, ",o=")
+	if len(parts) > 1 {
+		parent.Subject.CommonName = parts[0]
+		parent.Subject.Organization = parts[1:]
+	}
+
 	cert, err := x509.CreateCertificate(rand.Reader, &parent, caCert, signer.Public(), caKey)
 	if err != nil {
 		return nil, err
@@ -73,12 +88,22 @@ func NewSignedCert(signer crypto.Signer, caCert *x509.Certificate, caKey crypto.
 		return nil, err
 	}
 
+	expirationDays := defaultNewSignedCertExpirationDays
+	envExpirationDays := os.Getenv("CATTLE_NEW_SIGNED_CERT_EXPIRATION_DAYS")
+	if envExpirationDays != "" {
+		if envExpirationDaysInt, err := strconv.Atoi(envExpirationDays); err != nil {
+			logrus.Infof("[NewSignedCert] expiration days from ENV (%s) could not be converted to int (falling back to default value: %d)", envExpirationDays, defaultNewSignedCertExpirationDays)
+		} else {
+			expirationDays = envExpirationDaysInt
+		}
+	}
+
 	parent := x509.Certificate{
 		DNSNames:     domains,
 		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
 		IPAddresses:  ips,
 		KeyUsage:     x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
-		NotAfter:     time.Now().Add(time.Hour * 24 * 365).UTC(),
+		NotAfter:     time.Now().Add(time.Hour * 24 * time.Duration(expirationDays)).UTC(),
 		NotBefore:    caCert.NotBefore,
 		SerialNumber: serialNumber,
 		Subject: pkix.Name{
@@ -92,7 +117,12 @@ func NewSignedCert(signer crypto.Signer, caCert *x509.Certificate, caKey crypto.
 		return nil, err
 	}
 
-	return x509.ParseCertificate(cert)
+	parsedCert, err := x509.ParseCertificate(cert)
+	if err == nil {
+		logrus.Infof("certificate %s signed by %s: notBefore=%s notAfter=%s",
+			parsedCert.Subject, caCert.Subject, parsedCert.NotBefore, parsedCert.NotAfter)
+	}
+	return parsedCert, err
 }
 
 func ParseCertPEM(pemCerts []byte) (*x509.Certificate, error) {

factory/gen.go

@@ -5,14 +5,17 @@ import (
 	"crypto/ecdsa"
 	"crypto/elliptic"
 	"crypto/rand"
+	"crypto/sha1"
 	"crypto/sha256"
 	"crypto/x509"
 	"encoding/hex"
 	"encoding/pem"
+	"fmt"
 	"net"
 	"regexp"
 	"sort"
 	"strings"
+	"time"
 
 	"github.com/rancher/dynamiclistener/cert"
 	"github.com/sirupsen/logrus"
@@ -20,21 +23,22 @@ import (
 )
 
 const (
-	cnPrefix = "listener.cattle.io/cn-"
-	Static   = "listener.cattle.io/static"
-	hashKey  = "listener.cattle.io/hash"
+	cnPrefix    = "listener.cattle.io/cn-"
+	Static      = "listener.cattle.io/static"
+	Fingerprint = "listener.cattle.io/fingerprint"
 )
 
 var (
-	cnRegexp = regexp.MustCompile("^([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9]$")
+	cnRegexp = regexp.MustCompile("^([A-Za-z0-9:][-A-Za-z0-9_.:]*)?[A-Za-z0-9:]$")
 )
 
 type TLS struct {
-	CACert       *x509.Certificate
-	CAKey        crypto.Signer
-	CN           string
-	Organization []string
-	FilterCN     func(...string) []string
+	CACert              []*x509.Certificate
+	CAKey               crypto.Signer
+	CN                  string
+	Organization        []string
+	FilterCN            func(...string) []string
+	ExpirationDaysCheck int
 }
 
 func cns(secret *v1.Secret) (cns []string) {
@@ -49,16 +53,14 @@ func cns(secret *v1.Secret) (cns []string) {
 	return
 }
 
-func collectCNs(secret *v1.Secret) (domains []string, ips []net.IP, hash string, err error) {
+func collectCNs(secret *v1.Secret) (domains []string, ips []net.IP, err error) {
 	var (
-		cns    = cns(secret)
-		digest = sha256.New()
+		cns = cns(secret)
 	)
 
 	sort.Strings(cns)
 
 	for _, v := range cns {
-		digest.Write([]byte(v))
 		ip := net.ParseIP(v)
 		if ip == nil {
 			domains = append(domains, v)
@@ -67,45 +69,98 @@ func collectCNs(secret *v1.Secret) (domains []string, ips []net.IP, hash string,
 		}
 	}
 
-	hash = hex.EncodeToString(digest.Sum(nil))
 	return
 }
 
+// Merge combines the SAN lists from the target and additional Secrets, and
+// returns a potentially modified Secret, along with a bool indicating if the
+// returned Secret is not the same as the target Secret. Secrets with expired
+// certificates will never be returned.
+//
+// If the merge would not add any CNs to the additional Secret, the additional
+// Secret is returned, to allow for certificate rotation/regeneration.
+//
+// If the merge would not add any CNs to the target Secret, the target Secret is
+// returned; no merging is necessary.
+//
+// If neither certificate is acceptable as-is, a new certificate containing
+// the union of the two lists is generated, using the private key from the
+// first Secret. The returned Secret will contain the updated cert.
 func (t *TLS) Merge(target, additional *v1.Secret) (*v1.Secret, bool, error) {
-	return t.AddCN(target, cns(additional)...)
+	// static secrets can't be altered, don't bother trying
+	if IsStatic(target) {
+		return target, false, nil
+	}
+
+	mergedCNs := append(cns(target), cns(additional)...)
+
+	// if the additional secret already has all the CNs, use it in preference to the
+	// current one. This behavior is required to allow for renewal or regeneration.
+	if !NeedsUpdate(0, additional, mergedCNs...) && !t.IsExpired(additional) {
+		return additional, true, nil
+	}
+
+	// if the target secret already has all the CNs, continue using it. The additional
+	// cert had only a subset of the current CNs, so nothing needs to be added.
+	if !NeedsUpdate(0, target, mergedCNs...) && !t.IsExpired(target) {
+		return target, false, nil
+	}
+
+	// neither cert currently has all the necessary CNs or is unexpired; generate a new one.
+	return t.generateCert(target, mergedCNs...)
 }
 
-func (t *TLS) Refresh(secret *v1.Secret) (*v1.Secret, error) {
+// Renew returns a copy of the given certificate that has been re-signed
+// to extend the NotAfter date. It is an error to attempt to renew
+// a static (user-provided) certificate.
+func (t *TLS) Renew(secret *v1.Secret) (*v1.Secret, error) {
+	if IsStatic(secret) {
+		return secret, cert.ErrStaticCert
+	}
 	cns := cns(secret)
 	secret = secret.DeepCopy()
 	secret.Annotations = map[string]string{}
-	secret, _, err := t.AddCN(secret, cns...)
+	secret, _, err := t.generateCert(secret, cns...)
 	return secret, err
 }
 
+// Filter ensures that the CNs are all valid accorting to both internal logic, and any filter callbacks.
+// The returned list will contain only approved CN entries.
 func (t *TLS) Filter(cn ...string) []string {
-	if t.FilterCN == nil {
+	if len(cn) == 0 || t.FilterCN == nil {
 		return cn
 	}
 	return t.FilterCN(cn...)
 }
 
+// AddCN attempts to add a list of CN strings to a given Secret, returning the potentially-modified
+// Secret along with a bool indicating whether or not it has been updated. The Secret will not be changed
+// if it has an attribute indicating that it is static (aka user-provided), or if no new CNs were added.
 func (t *TLS) AddCN(secret *v1.Secret, cn ...string) (*v1.Secret, bool, error) {
-	var (
-		err error
-	)
-
 	cn = t.Filter(cn...)
 
-	if !NeedsUpdate(0, secret, cn...) {
+	if IsStatic(secret) || !NeedsUpdate(0, secret, cn...) {
 		return secret, false, nil
 	}
+	return t.generateCert(secret, cn...)
+}
 
+func (t *TLS) Regenerate(secret *v1.Secret) (*v1.Secret, error) {
+	cns := cns(secret)
+	secret, _, err := t.generateCert(nil, cns...)
+	return secret, err
+}
+
+func (t *TLS) generateCert(secret *v1.Secret, cn ...string) (*v1.Secret, bool, error) {
 	secret = secret.DeepCopy()
 	if secret == nil {
 		secret = &v1.Secret{}
 	}
 
+	if err := t.Verify(secret); err != nil {
+		logrus.Warnf("unable to verify existing certificate: %v - signing operation may change certificate issuer", err)
+	}
+
 	secret = populateCN(secret, cn...)
 
 	privateKey, err := getPrivateKey(secret)
@@ -113,7 +168,7 @@ func (t *TLS) AddCN(secret *v1.Secret, cn ...string) (*v1.Secret, bool, error) {
 		return nil, false, err
 	}
 
-	domains, ips, hash, err := collectCNs(secret)
+	domains, ips, err := collectCNs(secret)
 	if err != nil {
 		return nil, false, err
 	}
@@ -123,7 +178,7 @@ func (t *TLS) AddCN(secret *v1.Secret, cn ...string) (*v1.Secret, bool, error) {
 		return nil, false, err
 	}
 
-	certBytes, keyBytes, err := Marshal(newCert, privateKey)
+	keyBytes, certBytes, err := MarshalChain(privateKey, append([]*x509.Certificate{newCert}, t.CACert...)...)
 	if err != nil {
 		return nil, false, err
 	}
@@ -131,15 +186,56 @@ func (t *TLS) AddCN(secret *v1.Secret, cn ...string) (*v1.Secret, bool, error) {
 	if secret.Data == nil {
 		secret.Data = map[string][]byte{}
 	}
+	secret.Type = v1.SecretTypeTLS
 	secret.Data[v1.TLSCertKey] = certBytes
 	secret.Data[v1.TLSPrivateKeyKey] = keyBytes
-	secret.Annotations[hashKey] = hash
+	secret.Annotations[Fingerprint] = fmt.Sprintf("SHA1=%X", sha1.Sum(newCert.Raw))
 
 	return secret, true, nil
 }
 
+func (t *TLS) IsExpired(secret *v1.Secret) bool {
+	certsPem := secret.Data[v1.TLSCertKey]
+	if len(certsPem) == 0 {
+		return false
+	}
+
+	certificates, err := cert.ParseCertsPEM(certsPem)
+	if err != nil || len(certificates) == 0 {
+		return false
+	}
+
+	expirationDays := time.Duration(t.ExpirationDaysCheck) * time.Hour * 24
+	return time.Now().Add(expirationDays).After(certificates[0].NotAfter)
+}
+
+func (t *TLS) Verify(secret *v1.Secret) error {
+	certsPem := secret.Data[v1.TLSCertKey]
+	if len(certsPem) == 0 {
+		return nil
+	}
+
+	certificates, err := cert.ParseCertsPEM(certsPem)
+	if err != nil || len(certificates) == 0 {
+		return err
+	}
+
+	verifyOpts := x509.VerifyOptions{
+		Roots: x509.NewCertPool(),
+		KeyUsages: []x509.ExtKeyUsage{
+			x509.ExtKeyUsageAny,
+		},
+	}
+	for _, c := range t.CACert {
+		verifyOpts.Roots.AddCert(c)
+	}
+
+	_, err = certificates[0].Verify(verifyOpts)
+	return err
+}
+
 func (t *TLS) newCert(domains []string, ips []net.IP, privateKey crypto.Signer) (*x509.Certificate, error) {
-	return NewSignedCert(privateKey, t.CACert, t.CAKey, t.CN, t.Organization, domains, ips)
+	return NewSignedCert(privateKey, t.CACert[0], t.CAKey, t.CN, t.Organization, domains, ips)
 }
 
 func populateCN(secret *v1.Secret, cn ...string) *v1.Secret {
@@ -149,7 +245,7 @@ func populateCN(secret *v1.Secret, cn ...string) *v1.Secret {
 	}
 	for _, cn := range cn {
 		if cnRegexp.MatchString(cn) {
-			secret.Annotations[cnPrefix+cn] = cn
+			secret.Annotations[getAnnotationKey(cn)] = cn
 		} else {
 			logrus.Errorf("dropping invalid CN: %s", cn)
 		}
@@ -157,17 +253,26 @@ func populateCN(secret *v1.Secret, cn ...string) *v1.Secret {
 	return secret
 }
 
+// IsStatic returns true if the Secret has an attribute indicating that it contains
+// a static (aka user-provided) certificate, which should not be modified.
+func IsStatic(secret *v1.Secret) bool {
+	if secret != nil && secret.Annotations != nil {
+		return secret.Annotations[Static] == "true"
+	}
+	return false
+}
+
+// NeedsUpdate returns true if any of the CNs are not currently present on the
+// secret's Certificate, as recorded in the cnPrefix annotations. It will return
+// false if all requested CNs are already present, or if maxSANs is non-zero and has
+// been exceeded.
 func NeedsUpdate(maxSANs int, secret *v1.Secret, cn ...string) bool {
 	if secret == nil {
 		return true
 	}
 
-	if secret.Annotations[Static] == "true" {
-		return false
-	}
-
 	for _, cn := range cn {
-		if secret.Annotations[cnPrefix+cn] == "" {
+		if secret.Annotations[getAnnotationKey(cn)] == "" {
 			if maxSANs > 0 && len(cns(secret)) >= maxSANs {
 				return false
 			}
@@ -192,13 +297,33 @@ func getPrivateKey(secret *v1.Secret) (crypto.Signer, error) {
 	return NewPrivateKey()
 }
 
-func Marshal(x509Cert *x509.Certificate, privateKey crypto.Signer) ([]byte, []byte, error) {
+// MarshalChain returns given key and certificates as byte slices.
+func MarshalChain(privateKey crypto.Signer, certs ...*x509.Certificate) (keyBytes, certChainBytes []byte, err error) {
+	keyBytes, err = cert.MarshalPrivateKeyToPEM(privateKey)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	for _, cert := range certs {
+		if cert != nil {
+			certBlock := pem.Block{
+				Type:  CertificateBlockType,
+				Bytes: cert.Raw,
+			}
+			certChainBytes = append(certChainBytes, pem.EncodeToMemory(&certBlock)...)
+		}
+	}
+	return keyBytes, certChainBytes, nil
+}
+
+// Marshal returns the given cert and key as byte slices.
+func Marshal(x509Cert *x509.Certificate, privateKey crypto.Signer) (certBytes, keyBytes []byte, err error) {
 	certBlock := pem.Block{
 		Type:  CertificateBlockType,
 		Bytes: x509Cert.Raw,
 	}
 
-	keyBytes, err := cert.MarshalPrivateKeyToPEM(privateKey)
+	keyBytes, err = cert.MarshalPrivateKeyToPEM(privateKey)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -206,6 +331,26 @@ func Marshal(x509Cert *x509.Certificate, privateKey crypto.Signer) ([]byte, []by
 	return pem.EncodeToMemory(&certBlock), keyBytes, nil
 }
 
+// NewPrivateKey returnes a new ECDSA key
 func NewPrivateKey() (crypto.Signer, error) {
 	return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 }
+
+// getAnnotationKey return the key to use for a given CN. IPv4 addresses and short hostnames
+// are safe to store as-is, but longer hostnames and IPv6 address must be truncated and/or undergo
+// character replacement in order to be used as an annotation key. If the CN requires modification,
+// a portion of the SHA256 sum of the original value is used as the suffix, to reduce the likelihood
+// of collisions in modified values.
+func getAnnotationKey(cn string) string {
+	cn = cnPrefix + cn
+	cnLen := len(cn)
+	if cnLen < 64 && !strings.ContainsRune(cn, ':') {
+		return cn
+	}
+	digest := sha256.Sum256([]byte(cn))
+	cn = strings.ReplaceAll(cn, ":", "_")
+	if cnLen > 56 {
+		cnLen = 56
+	}
+	return cn[0:cnLen] + "-" + hex.EncodeToString(digest[0:])[0:6]
+}

filter.go

@@ -0,0 +1,12 @@
+package dynamiclistener
+
+func OnlyAllow(str string) func(...string) []string {
+	return func(s2 ...string) []string {
+		for _, s := range s2 {
+			if s == str {
+				return []string{s}
+			}
+		}
+		return nil
+	}
+}

go.mod

@@ -1,11 +1,64 @@
 module github.com/rancher/dynamiclistener
 
-go 1.12
+go 1.24.0
+
+toolchain go1.24.6
 
 require (
-	github.com/rancher/wrangler v0.6.2-0.20200714200521-c61fae623942
-	github.com/sirupsen/logrus v1.4.2
-	golang.org/x/crypto v0.0.0-20200220183623-bac4c82f6975
-	k8s.io/api v0.18.0
-	k8s.io/apimachinery v0.18.0
+	github.com/rancher/wrangler/v3 v3.2.2-rc.3
+	github.com/sirupsen/logrus v1.9.3
+	github.com/stretchr/testify v1.10.0
+	golang.org/x/crypto v0.36.0
+	k8s.io/api v0.33.1
+	k8s.io/apimachinery v0.33.1
+	k8s.io/client-go v0.33.1
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/emicklei/go-restful/v3 v3.12.1 // indirect
+	github.com/evanphx/json-patch v5.9.11+incompatible // indirect
+	github.com/fxamacker/cbor/v2 v2.7.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-openapi/jsonpointer v0.21.0 // indirect
+	github.com/go-openapi/jsonreference v0.21.0 // indirect
+	github.com/go-openapi/swag v0.23.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/google/gnostic-models v0.6.9 // indirect
+	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/prometheus/client_golang v1.22.0 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.62.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/rancher/lasso v0.2.3-rc3 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
+	golang.org/x/net v0.38.0 // indirect
+	golang.org/x/oauth2 v0.27.0 // indirect
+	golang.org/x/sync v0.12.0 // indirect
+	golang.org/x/sys v0.31.0 // indirect
+	golang.org/x/term v0.30.0 // indirect
+	golang.org/x/text v0.23.0 // indirect
+	golang.org/x/time v0.9.0 // indirect
+	google.golang.org/protobuf v1.36.5 // indirect
+	gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/klog/v2 v2.130.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20250318190949-c8a335a9a2ff // indirect
+	k8s.io/utils v0.0.0-20241104100929-3ea5e8cea738 // indirect
+	sigs.k8s.io/json v0.0.0-20241010143419-9aa6b5e7a4b3 // indirect
+	sigs.k8s.io/randfill v1.0.0 // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.6.0 // indirect
+	sigs.k8s.io/yaml v1.4.0 // indirect
 )

go.sum

@@ -1,431 +1,176 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
-github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
-github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
-github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=
-github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
-github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
-github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
-github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
-github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
-github.com/PuerkitoBio/purell v1.1.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
-github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
-github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
-github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
-github.com/agnivade/levenshtein v1.0.1/go.mod h1:CURSv5d9Uaml+FovSIICkLbAUZ9S4RqaHDIsdSBg7lM=
-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
-github.com/asaskevich/govalidator v0.0.0-20180720115003-f9ffefc3facf/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
-github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
-github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
-github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
-github.com/blang/semver v3.5.0+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnwebNt5EWlYSAyrTnjyyk=
-github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
-github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
-github.com/coreos/go-oidc v2.1.0+incompatible/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHoZ1nMCKZlZ9V6mm3/LKc=
-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
-github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
-github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
-github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
-github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
-github.com/coreos/pkg v0.0.0-20180108230652-97fdf19511ea/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
-github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
-github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
-github.com/docker/docker v0.7.3-0.20190327010347-be7ac8be2ae0/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
-github.com/docker/go-units v0.3.3/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
-github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
-github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
-github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
-github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
-github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
-github.com/elazarl/goproxy v0.0.0-20180725130230-947c36da3153/go.mod h1:/Zj4wYkgs4iZTTu3o/KG3Itv/qCCa8VVMlb3i9OVuzc=
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+k8s.io/utils v0.0.0-20241104100929-3ea5e8cea738/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
+sigs.k8s.io/json v0.0.0-20241010143419-9aa6b5e7a4b3 h1:/Rv+M11QRah1itp8VhT6HoVx1Ray9eB4DBr+K+/sCJ8=
+sigs.k8s.io/json v0.0.0-20241010143419-9aa6b5e7a4b3/go.mod h1:18nIHnGi6636UCz6m8i4DhaJ65T6EruyzmoQqI2BVDo=
+sigs.k8s.io/randfill v0.0.0-20250304075658-069ef1bbf016/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY=
+sigs.k8s.io/randfill v1.0.0 h1:JfjMILfT8A6RbawdsK2JXGBR5AQVfd+9TbzrlneTyrU=
+sigs.k8s.io/randfill v1.0.0/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY=
+sigs.k8s.io/structured-merge-diff/v4 v4.6.0 h1:IUA9nvMmnKWcj5jl84xn+T5MnlZKThmUW1TdblaLVAc=
+sigs.k8s.io/structured-merge-diff/v4 v4.6.0/go.mod h1:dDy58f92j70zLsuZVuUX5Wp9vtxXpaZnkPGWeqDfCps=
+sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E=
+sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY=

listener.go

@@ -11,6 +11,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/rancher/dynamiclistener/cert"
 	"github.com/rancher/dynamiclistener/factory"
 	"github.com/sirupsen/logrus"
 	v1 "k8s.io/api/core/v1"
@@ -22,17 +23,23 @@ type TLSStorage interface {
 }
 
 type TLSFactory interface {
-	Refresh(secret *v1.Secret) (*v1.Secret, error)
+	Renew(secret *v1.Secret) (*v1.Secret, error)
 	AddCN(secret *v1.Secret, cn ...string) (*v1.Secret, bool, error)
 	Merge(target *v1.Secret, additional *v1.Secret) (*v1.Secret, bool, error)
 	Filter(cn ...string) []string
+	Regenerate(secret *v1.Secret) (*v1.Secret, error)
 }
 
 type SetFactory interface {
 	SetFactory(tls TLSFactory)
 }
 
+// Deprecated: Use NewListenerWithChain instead as it supports intermediate CAs
 func NewListener(l net.Listener, storage TLSStorage, caCert *x509.Certificate, caKey crypto.Signer, config Config) (net.Listener, http.Handler, error) {
+	return NewListenerWithChain(l, storage, []*x509.Certificate{caCert}, caKey, config)
+}
+
+func NewListenerWithChain(l net.Listener, storage TLSStorage, caCert []*x509.Certificate, caKey crypto.Signer, config Config) (net.Listener, http.Handler, error) {
 	if config.CN == "" {
 		config.CN = "dynamic"
 	}
@@ -42,16 +49,21 @@ func NewListener(l net.Listener, storage TLSStorage, caCert *x509.Certificate, c
 	if config.TLSConfig == nil {
 		config.TLSConfig = &tls.Config{}
 	}
+	if config.ExpirationDaysCheck == 0 {
+		config.ExpirationDaysCheck = 90
+	}
 
 	dynamicListener := &listener{
 		factory: &factory.TLS{
-			CACert:       caCert,
-			CAKey:        caKey,
-			CN:           config.CN,
-			Organization: config.Organization,
-			FilterCN:     allowDefaultSANs(config.SANs, config.FilterCN),
+			CACert:              caCert,
+			CAKey:               caKey,
+			CN:                  config.CN,
+			Organization:        config.Organization,
+			FilterCN:            allowDefaultSANs(config.SANs, config.FilterCN),
+			ExpirationDaysCheck: config.ExpirationDaysCheck,
 		},
 		Listener:  l,
+		certReady: make(chan struct{}),
 		storage:   &nonNil{storage: storage},
 		sans:      config.SANs,
 		maxSANs:   config.MaxSANs,
@@ -73,11 +85,14 @@ func NewListener(l net.Listener, storage TLSStorage, caCert *x509.Certificate, c
 		setter.SetFactory(dynamicListener.factory)
 	}
 
-	if config.ExpirationDaysCheck == 0 {
-		config.ExpirationDaysCheck = 30
+	if config.RegenerateCerts != nil && config.RegenerateCerts() {
+		if err := dynamicListener.regenerateCerts(); err != nil {
+			return nil, nil, err
+		}
 	}
 
 	tlsListener := tls.NewListener(dynamicListener.WrapExpiration(config.ExpirationDaysCheck), dynamicListener.tlsConfig)
+
 	return tlsListener, dynamicListener.cacheHandler(), nil
 }
 
@@ -128,6 +143,7 @@ type Config struct {
 	MaxSANs               int
 	ExpirationDaysCheck   int
 	CloseConnOnCertChange bool
+	RegenerateCerts       func() bool
 	FilterCN              func(...string) []string
 }
 
@@ -144,6 +160,7 @@ type listener struct {
 	version   string
 	tlsConfig *tls.Config
 	cert      *tls.Certificate
+	certReady chan struct{}
 	sans      []string
 	maxSANs   int
 	init      sync.Once
@@ -152,13 +169,24 @@ type listener struct {
 func (l *listener) WrapExpiration(days int) net.Listener {
 	ctx, cancel := context.WithCancel(context.Background())
 	go func() {
-		time.Sleep(5 * time.Minute)
+
+		// wait for cert to be set, this will unblock when the channel is closed
+		select {
+		case <-ctx.Done():
+			return
+		case <-l.certReady:
+		}
 
 		for {
 			wait := 6 * time.Hour
 			if err := l.checkExpiration(days); err != nil {
-				logrus.Errorf("failed to check and refresh dynamic cert: %v", err)
-				wait = 5 + time.Minute
+				logrus.Errorf("dynamiclistener %s: failed to check and renew dynamic cert: %v", l.Addr(), err)
+				// Don't go into short retry loop if we're using a static (user-provided) cert.
+				// We will still check and print an error every six hours until the user updates the secret with
+				// a cert that is not about to expire. Hopefully this will prompt them to take action.
+				if err != cert.ErrStaticCert {
+					wait = 5 * time.Minute
+				}
 			}
 			select {
 			case <-ctx.Done():
@@ -174,6 +202,30 @@ func (l *listener) WrapExpiration(days int) net.Listener {
 	}
 }
 
+// regenerateCerts regenerates the used certificates and
+// updates the secret.
+func (l *listener) regenerateCerts() error {
+	l.Lock()
+	defer l.Unlock()
+
+	secret, err := l.storage.Get()
+	if err != nil {
+		return err
+	}
+
+	newSecret, err := l.factory.Regenerate(secret)
+	if err != nil {
+		return err
+	}
+	if err := l.storage.Update(newSecret); err != nil {
+		return err
+	}
+	// clear version to force cert reload
+	l.version = ""
+
+	return nil
+}
+
 func (l *listener) checkExpiration(days int) error {
 	l.Lock()
 	defer l.Unlock()
@@ -191,22 +243,26 @@ func (l *listener) checkExpiration(days int) error {
 		return err
 	}
 
-	cert, err := tls.X509KeyPair(secret.Data[v1.TLSCertKey], secret.Data[v1.TLSPrivateKeyKey])
+	keyPair, err := tls.X509KeyPair(secret.Data[v1.TLSCertKey], secret.Data[v1.TLSPrivateKeyKey])
 	if err != nil {
 		return err
 	}
 
-	certParsed, err := x509.ParseCertificate(cert.Certificate[0])
+	certParsed, err := x509.ParseCertificate(keyPair.Certificate[0])
 	if err != nil {
 		return err
 	}
 
-	if time.Now().UTC().Add(time.Hour * 24 * time.Duration(days)).After(certParsed.NotAfter) {
-		secret, err := l.factory.Refresh(secret)
+	if cert.IsCertExpired(certParsed, days) {
+		secret, err := l.factory.Renew(secret)
 		if err != nil {
 			return err
 		}
-		return l.storage.Update(secret)
+		if err := l.storage.Update(secret); err != nil {
+			return err
+		}
+		// clear version to force cert reload
+		l.version = ""
 	}
 
 	return nil
@@ -215,7 +271,19 @@ func (l *listener) checkExpiration(days int) error {
 func (l *listener) Accept() (net.Conn, error) {
 	l.init.Do(func() {
 		if len(l.sans) > 0 {
-			l.updateCert(l.sans...)
+			if err := l.updateCert(l.sans...); err != nil {
+				logrus.Errorf("dynamiclistener %s: failed to update cert with configured SANs: %v", l.Addr(), err)
+				return
+			}
+		}
+		if cert, err := l.loadCert(nil); err != nil {
+			logrus.Errorf("dynamiclistener %s: failed to preload certificate: %v", l.Addr(), err)
+		} else if cert == nil {
+			// This should only occur on the first startup when no SANs are configured in the listener config, in which
+			// case no certificate can be created, as dynamiclistener will not create certificates until at least one IP
+			// or DNS SAN is set. It will also occur when using the Kubernetes storage without a local File cache.
+			// For reliable serving of requests, callers should configure a local cache and/or a default set of SANs.
+			logrus.Warnf("dynamiclistener %s: no cached certificate available for preload - deferring certificate load until storage initialization or first client request", l.Addr())
 		}
 	})
 
@@ -231,14 +299,12 @@ func (l *listener) Accept() (net.Conn, error) {
 
 	host, _, err := net.SplitHostPort(addr.String())
 	if err != nil {
-		logrus.Errorf("failed to parse network %s: %v", addr.Network(), err)
+		logrus.Errorf("dynamiclistener %s: failed to parse connection local address %s: %v", l.Addr(), addr, err)
 		return conn, nil
 	}
 
-	if !strings.Contains(host, ":") {
-		if err := l.updateCert(host); err != nil {
-			logrus.Infof("failed to create TLS cert for: %s, %v", host, err)
-		}
+	if err := l.updateCert(host); err != nil {
+		logrus.Errorf("dynamiclistener %s: failed to update cert with connection local address: %v", l.Addr(), err)
 	}
 
 	if l.conns != nil {
@@ -265,8 +331,9 @@ func (l *listener) wrap(conn net.Conn) net.Conn {
 
 type closeWrapper struct {
 	net.Conn
-	id int
-	l  *listener
+	id    int
+	l     *listener
+	ready bool
 }
 
 func (c *closeWrapper) close() error {
@@ -281,13 +348,27 @@ func (c *closeWrapper) Close() error {
 }
 
 func (l *listener) getCertificate(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
+	newConn := hello.Conn
 	if hello.ServerName != "" {
 		if err := l.updateCert(hello.ServerName); err != nil {
+			logrus.Errorf("dynamiclistener %s: failed to update cert with TLS ServerName: %v", l.Addr(), err)
 			return nil, err
 		}
 	}
-
-	return l.loadCert()
+	connCert, err := l.loadCert(newConn)
+	if connCert != nil && err == nil && newConn != nil && l.conns != nil {
+		// if we were successfully able to load a cert and are closing connections on cert changes, mark newConn ready
+		// this will allow us to close the connection if a future connection forces the cert to re-load
+		wrapper, ok := newConn.(*closeWrapper)
+		if !ok {
+			logrus.Debugf("will not mark non-close wrapper connection from %s to %s as ready", newConn.RemoteAddr(), newConn.LocalAddr())
+			return connCert, err
+		}
+		l.connLock.Lock()
+		l.conns[wrapper.id].ready = true
+		l.connLock.Unlock()
+	}
+	return connCert, err
 }
 
 func (l *listener) updateCert(cn ...string) error {
@@ -304,7 +385,7 @@ func (l *listener) updateCert(cn ...string) error {
 		return err
 	}
 
-	if !factory.NeedsUpdate(l.maxSANs, secret, cn...) {
+	if factory.IsStatic(secret) || !factory.NeedsUpdate(l.maxSANs, secret, cn...) {
 		return nil
 	}
 
@@ -322,21 +403,16 @@ func (l *listener) updateCert(cn ...string) error {
 		if err := l.storage.Update(secret); err != nil {
 			return err
 		}
-		// clear version to force cert reload
+		// Clear version to force cert reload next time loadCert is called by TLSConfig's
+		// GetCertificate hook to provide a certificate for a new connection. Note that this
+		// means the old certificate stays in l.cert until a new connection is made.
 		l.version = ""
-		if l.conns != nil {
-			l.connLock.Lock()
-			for _, conn := range l.conns {
-				_ = conn.close()
-			}
-			l.connLock.Unlock()
-		}
 	}
 
 	return nil
 }
 
-func (l *listener) loadCert() (*tls.Certificate, error) {
+func (l *listener) loadCert(currentConn net.Conn) (*tls.Certificate, error) {
 	l.RLock()
 	defer l.RUnlock()
 
@@ -344,7 +420,7 @@ func (l *listener) loadCert() (*tls.Certificate, error) {
 	if err != nil {
 		return nil, err
 	}
-	if l.cert != nil && l.version == secret.ResourceVersion {
+	if l.cert != nil && l.version == secret.ResourceVersion && secret.ResourceVersion != "" {
 		return l.cert, nil
 	}
 
@@ -357,7 +433,10 @@ func (l *listener) loadCert() (*tls.Certificate, error) {
 	if err != nil {
 		return nil, err
 	}
-	if l.cert != nil && l.version == secret.ResourceVersion {
+	if !cert.IsValidTLSSecret(secret) {
+		return l.cert, nil
+	}
+	if l.cert != nil && l.version == secret.ResourceVersion && secret.ResourceVersion != "" {
 		return l.cert, nil
 	}
 
@@ -366,7 +445,25 @@ func (l *listener) loadCert() (*tls.Certificate, error) {
 		return nil, err
 	}
 
+	// cert has changed, close closeWrapper wrapped connections if this isn't the first load
+	if currentConn != nil && l.conns != nil && l.cert != nil {
+		l.connLock.Lock()
+		for _, conn := range l.conns {
+			// Don't close a connection that's in the middle of completing a TLS handshake
+			if !conn.ready {
+				continue
+			}
+			_ = conn.close()
+		}
+		l.connLock.Unlock()
+	}
+
+	// we can only close the ready channel once when the cert is first assigned
+	canClose := l.cert == nil
 	l.cert = &cert
+	if canClose {
+		close(l.certReady)
+	}
 	l.version = secret.ResourceVersion
 	return l.cert, nil
 }
@@ -386,7 +483,9 @@ func (l *listener) cacheHandler() http.Handler {
 				}
 			}
 
-			l.updateCert(h)
+			if err := l.updateCert(h); err != nil {
+				logrus.Errorf("dynamiclistener %s: failed to update cert with HTTP request Host header: %v", l.Addr(), err)
+			}
 		}
 	})
 }

listener_test.go

@@ -0,0 +1,225 @@
+package dynamiclistener
+
+import (
+	"crypto/tls"
+	"net"
+	"testing"
+	"time"
+
+	"github.com/rancher/dynamiclistener/factory"
+	"github.com/stretchr/testify/assert"
+	v1 "k8s.io/api/core/v1"
+	apiError "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+func Test_getCertificate(t *testing.T) {
+	beforeKey, beforeCert, err := newCertificate()
+	assert.NoError(t, err, "Error when setting up test - unable to construct before key for test")
+	beforeTLSCert, err := tls.X509KeyPair(beforeCert, beforeKey)
+	assert.NoError(t, err, "Error when setting up test - unable to convert before to tls.Certificate")
+	afterKey, afterCert, err := newCertificate()
+	assert.NoError(t, err, "Error when setting up test - unable to construct after key for test")
+	afterTLSCert, err := tls.X509KeyPair(afterCert, afterKey)
+	assert.NoError(t, err, "Error when setting up test - unable to convert after to tls.Certificate")
+	tests := []struct {
+		// input test vars
+		name          string
+		secret        *v1.Secret
+		secretErr     error
+		cachedCert    *tls.Certificate
+		cachedVersion string
+		currentConn   *closeWrapper
+		otherConns    map[int]*closeWrapper
+
+		// output/result test vars
+		closedConns  []int
+		expectedCert *tls.Certificate
+		wantError    bool
+	}{
+		{
+			name:   "no secret found",
+			secret: nil,
+			secretErr: apiError.NewNotFound(schema.GroupResource{
+				Group:    "",
+				Resource: "Secret",
+			}, "testSecret"),
+			currentConn: &closeWrapper{id: 0},
+			otherConns:  map[int]*closeWrapper{},
+
+			expectedCert: nil,
+			wantError:    true,
+		},
+		{
+			name: "secret found, and is up to date",
+			secret: &v1.Secret{
+				ObjectMeta: metav1.ObjectMeta{
+					ResourceVersion: "1",
+					Name:            "testSecret",
+					Namespace:       "test",
+				},
+				Data: map[string][]byte{
+					v1.TLSCertKey:       beforeCert,
+					v1.TLSPrivateKeyKey: beforeKey,
+				},
+			},
+			cachedVersion: "1",
+			cachedCert:    &beforeTLSCert,
+			currentConn:   &closeWrapper{id: 0},
+			otherConns:    map[int]*closeWrapper{},
+
+			expectedCert: &beforeTLSCert,
+			wantError:    false,
+		},
+		{
+			name: "secret found, is not up to date, but k8s secret is not valid",
+			secret: &v1.Secret{
+				ObjectMeta: metav1.ObjectMeta{
+					ResourceVersion: "2",
+					Name:            "testSecret",
+					Namespace:       "test",
+				},
+				Data: map[string][]byte{
+					v1.TLSPrivateKeyKey: []byte("strawberry"),
+				},
+			},
+			cachedVersion: "1",
+			cachedCert:    &beforeTLSCert,
+			currentConn:   &closeWrapper{id: 0},
+			otherConns:    map[int]*closeWrapper{},
+
+			expectedCert: &beforeTLSCert,
+			wantError:    false,
+		},
+		{
+			name: "secret found, but is not up to date",
+			secret: &v1.Secret{
+				ObjectMeta: metav1.ObjectMeta{
+					ResourceVersion: "2",
+					Name:            "testSecret",
+					Namespace:       "test",
+				},
+				Data: map[string][]byte{
+					v1.TLSCertKey:       afterCert,
+					v1.TLSPrivateKeyKey: afterKey,
+				},
+			},
+			cachedVersion: "1",
+			cachedCert:    &beforeTLSCert,
+			currentConn:   &closeWrapper{id: 0},
+			otherConns:    map[int]*closeWrapper{},
+
+			expectedCert: &afterTLSCert,
+			wantError:    false,
+		},
+		{
+			name: "secret found, is not up to date, and we have conns using current cert",
+			secret: &v1.Secret{
+				ObjectMeta: metav1.ObjectMeta{
+					ResourceVersion: "2",
+					Name:            "testSecret",
+					Namespace:       "test",
+				},
+				Data: map[string][]byte{
+					v1.TLSCertKey:       afterCert,
+					v1.TLSPrivateKeyKey: afterKey,
+				},
+			},
+			cachedVersion: "1",
+			cachedCert:    &beforeTLSCert,
+			currentConn:   &closeWrapper{id: 0},
+			otherConns: map[int]*closeWrapper{
+				1: {
+					id:    1,
+					ready: false,
+					Conn:  &fakeConn{},
+				},
+				2: {
+					id:    2,
+					ready: true,
+					Conn:  &fakeConn{},
+				},
+			},
+
+			closedConns:  []int{2},
+			expectedCert: &afterTLSCert,
+			wantError:    false,
+		},
+	}
+	for i := range tests {
+		test := tests[i]
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+			testConns := test.otherConns
+			if testConns != nil {
+				testConns[test.currentConn.id] = test.currentConn
+				// make sure our conn is listed as one of the current connections
+			}
+			l := listener{
+				cert:    test.cachedCert,
+				version: test.cachedVersion,
+				storage: &MockTLSStorage{
+					Secret:    test.secret,
+					SecretErr: test.secretErr,
+				},
+				conns: testConns,
+			}
+			for _, conn := range testConns {
+				conn.l = &l
+			}
+			newCert, err := l.getCertificate(&tls.ClientHelloInfo{Conn: test.currentConn})
+			if test.wantError {
+				assert.Errorf(t, err, "expected an error but none was provdied")
+			} else {
+				assert.NoError(t, err, "did not expect an error but got one")
+			}
+			assert.Equal(t, test.expectedCert, newCert, "expected cert did not match actual cert")
+			if test.expectedCert != nil && test.wantError == false && test.currentConn != nil && test.otherConns != nil {
+				assert.True(t, test.currentConn.ready, "expected connection to be ready but it was not")
+			} else {
+				if test.currentConn != nil {
+					assert.False(t, test.currentConn.ready, "did not expect connection to be ready")
+				}
+			}
+			for _, closedConn := range test.closedConns {
+				_, ok := l.conns[closedConn]
+				assert.False(t, ok, "closed conns should not be found")
+			}
+		})
+	}
+}
+
+func newCertificate() ([]byte, []byte, error) {
+	cert, key, err := factory.GenCA()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return factory.MarshalChain(key, cert)
+}
+
+type MockTLSStorage struct {
+	Secret    *v1.Secret
+	SecretErr error
+}
+
+func (m *MockTLSStorage) Get() (*v1.Secret, error) {
+	return m.Secret, m.SecretErr
+}
+
+func (m *MockTLSStorage) Update(secret *v1.Secret) error {
+	panic("Not implemented")
+}
+
+// adapted from k8s.io/apimachinery@v0.18.8/pkg/util.proxy/ugradeaware_test.go
+type fakeConn struct{}
+
+func (f *fakeConn) Read([]byte) (int, error)        { return 0, nil }
+func (f *fakeConn) Write([]byte) (int, error)       { return 0, nil }
+func (f *fakeConn) Close() error                    { return nil }
+func (fakeConn) LocalAddr() net.Addr                { return nil }
+func (fakeConn) RemoteAddr() net.Addr               { return nil }
+func (fakeConn) SetDeadline(t time.Time) error      { return nil }
+func (fakeConn) SetReadDeadline(t time.Time) error  { return nil }
+func (fakeConn) SetWriteDeadline(t time.Time) error { return nil }

server/server.go

@@ -15,12 +15,14 @@ import (
 	"github.com/rancher/dynamiclistener/storage/file"
 	"github.com/rancher/dynamiclistener/storage/kubernetes"
 	"github.com/rancher/dynamiclistener/storage/memory"
-	v1 "github.com/rancher/wrangler/pkg/generated/controllers/core/v1"
+	v1 "github.com/rancher/wrangler/v3/pkg/generated/controllers/core/v1"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/crypto/acme/autocert"
 )
 
 type ListenOpts struct {
+	CAChain []*x509.Certificate
+	// Deprecated: Use CAChain instead
 	CA                *x509.Certificate
 	CAKey             crypto.Signer
 	Storage           dynamiclistener.TLSStorage
@@ -34,20 +36,30 @@ type ListenOpts struct {
 	BindHost          string
 	NoRedirect        bool
 	TLSListenerConfig dynamiclistener.Config
+
+	// Override legacy behavior where server logs written to the application's logrus object
+	// were dropped unless logrus was set to debug-level (such as by launching steve with '--debug').
+	// Setting this to true results in server logs appearing at an ERROR level.
+	DisplayServerLogs bool
 }
 
 func ListenAndServe(ctx context.Context, httpsPort, httpPort int, handler http.Handler, opts *ListenOpts) error {
+	logger := logrus.StandardLogger()
+	writer := logger.WriterLevel(logrus.DebugLevel)
 	if opts == nil {
 		opts = &ListenOpts{}
 	}
+	if opts.DisplayServerLogs {
+		writer = logger.WriterLevel(logrus.ErrorLevel)
+	}
+	// Otherwise preserve legacy behaviour of displaying server logs only in debug mode.
+
+	errorLog := log.New(writer, "", log.LstdFlags)
 
 	if opts.TLSListenerConfig.TLSConfig == nil {
 		opts.TLSListenerConfig.TLSConfig = &tls.Config{}
 	}
 
-	logger := logrus.StandardLogger()
-	errorLog := log.New(logger.WriterLevel(logrus.DebugLevel), "", log.LstdFlags)
-
 	if httpsPort > 0 {
 		tlsTCPListener, err := dynamiclistener.NewTCPListener(opts.BindHost, httpsPort)
 		if err != nil {
@@ -64,7 +76,10 @@ func ListenAndServe(ctx context.Context, httpsPort, httpPort int, handler http.H
 		}
 
 		tlsServer := http.Server{
-			Handler:  handler,
+			Handler: handler,
+			BaseContext: func(listener net.Listener) context.Context {
+				return ctx
+			},
 			ErrorLog: errorLog,
 		}
 
@@ -86,6 +101,9 @@ func ListenAndServe(ctx context.Context, httpsPort, httpPort int, handler http.H
 			Addr:     fmt.Sprintf("%s:%d", opts.BindHost, httpPort),
 			Handler:  handler,
 			ErrorLog: errorLog,
+			BaseContext: func(listener net.Listener) context.Context {
+				return ctx
+			},
 		}
 		go func() {
 			logrus.Infof("Listening on %s:%d", opts.BindHost, httpPort)
@@ -126,7 +144,7 @@ func getTLSListener(ctx context.Context, tcp net.Listener, handler http.Handler,
 		return nil, nil, err
 	}
 
-	listener, dynHandler, err := dynamiclistener.NewListener(tcp, storage, caCert, caKey, opts.TLSListenerConfig)
+	listener, dynHandler, err := dynamiclistener.NewListenerWithChain(tcp, storage, caCert, caKey, opts.TLSListenerConfig)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -134,13 +152,17 @@ func getTLSListener(ctx context.Context, tcp net.Listener, handler http.Handler,
 	return listener, wrapHandler(dynHandler, handler), nil
 }
 
-func getCA(opts ListenOpts) (*x509.Certificate, crypto.Signer, error) {
-	if opts.CA != nil && opts.CAKey != nil {
-		return opts.CA, opts.CAKey, nil
+func getCA(opts ListenOpts) ([]*x509.Certificate, crypto.Signer, error) {
+	if opts.CAKey != nil {
+		if opts.CAChain != nil {
+			return opts.CAChain, opts.CAKey, nil
+		} else if opts.CA != nil {
+			return []*x509.Certificate{opts.CA}, opts.CAKey, nil
+		}
 	}
 
 	if opts.Secrets == nil {
-		return factory.LoadOrGenCA()
+		return factory.LoadOrGenCAChain()
 	}
 
 	if opts.CAName == "" {
@@ -155,7 +177,7 @@ func getCA(opts ListenOpts) (*x509.Certificate, crypto.Signer, error) {
 		opts.CANamespace = "kube-system"
 	}
 
-	return kubernetes.LoadOrGenCA(opts.Secrets, opts.CANamespace, opts.CAName)
+	return kubernetes.LoadOrGenCAChain(opts.Secrets, opts.CANamespace, opts.CAName)
 }
 
 func newStorage(ctx context.Context, opts ListenOpts) dynamiclistener.TLSStorage {

server/server_test.go

@@ -0,0 +1,134 @@
+package server
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"net"
+	"net/http"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	assertPkg "github.com/stretchr/testify/assert"
+)
+
+type alwaysPanicHandler struct {
+	msg string
+}
+
+func (z *alwaysPanicHandler) ServeHTTP(_ http.ResponseWriter, _ *http.Request) {
+	panic(z.msg)
+}
+
+// safeWriter is used to allow writing to a buffer-based log in a web server
+// and safely read from it in the client (i.e. this test code)
+type safeWriter struct {
+	writer *bytes.Buffer
+	mutex  *sync.Mutex
+}
+
+func newSafeWriter(writer *bytes.Buffer, mutex *sync.Mutex) *safeWriter {
+	return &safeWriter{writer: writer, mutex: mutex}
+}
+
+func (s *safeWriter) Write(p []byte) (n int, err error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	return s.writer.Write(p)
+}
+
+func TestHttpServerLogWithLogrus(t *testing.T) {
+	assert := assertPkg.New(t)
+	message := "debug-level writer"
+	msg := fmt.Sprintf("panicking context: %s", message)
+	var buf bytes.Buffer
+	var mutex sync.Mutex
+	safeWriter := newSafeWriter(&buf, &mutex)
+	err := doRequest(safeWriter, message, logrus.ErrorLevel)
+	assert.Nil(err)
+
+	mutex.Lock()
+	s := buf.String()
+	assert.Greater(len(s), 0)
+	assert.Contains(s, msg)
+	assert.Contains(s, "panic serving 127.0.0.1")
+	mutex.Unlock()
+}
+
+func TestHttpNoServerLogsWithLogrus(t *testing.T) {
+	assert := assertPkg.New(t)
+
+	message := "error-level writer"
+	var buf bytes.Buffer
+	var mutex sync.Mutex
+	safeWriter := newSafeWriter(&buf, &mutex)
+	err := doRequest(safeWriter, message, logrus.DebugLevel)
+	assert.Nil(err)
+
+	mutex.Lock()
+	s := buf.String()
+	if len(s) > 0 {
+		assert.NotContains(s, message)
+	}
+	mutex.Unlock()
+}
+
+func doRequest(safeWriter *safeWriter, message string, logLevel logrus.Level) error {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	host := "127.0.0.1"
+	httpPort := 9012
+	httpsPort := 0
+	msg := fmt.Sprintf("panicking context: %s", message)
+	handler := alwaysPanicHandler{msg: msg}
+	listenOpts := &ListenOpts{
+		BindHost: host,
+		DisplayServerLogs: logLevel == logrus.ErrorLevel,
+	}
+
+	logrus.StandardLogger().SetOutput(safeWriter)
+	if err := ListenAndServe(ctx, httpsPort, httpPort, &handler, listenOpts); err != nil {
+		return err
+	}
+	addr := fmt.Sprintf("%s:%d", host, httpPort)
+	return makeTheHttpRequest(addr)
+}
+
+func makeTheHttpRequest(addr string) error {
+	url := fmt.Sprintf("%s://%s/", "http", addr)
+
+	waitTime := 10 * time.Millisecond
+	totalTime := 0 * time.Millisecond
+	const maxWaitTime = 10 * time.Second
+	// Waiting for server to be ready..., max of maxWaitTime
+	for {
+		conn, err := net.Dial("tcp", addr)
+		if err == nil {
+			conn.Close()
+			break
+		} else if totalTime > maxWaitTime {
+			return fmt.Errorf("timed out waiting for the server to start after %d msec", totalTime/1e6)
+		}
+		time.Sleep(waitTime)
+		totalTime += waitTime
+		waitTime += 10 * time.Millisecond
+	}
+
+	client := &http.Client{
+		Timeout: 30 * time.Second,
+	}
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return fmt.Errorf("error creating request: %w", err)
+	}
+	resp, err := client.Do(req)
+	if err == nil {
+		return fmt.Errorf("server should have panicked on request")
+	}
+	if resp != nil {
+		defer resp.Body.Close()
+	}
+	return nil
+}

storage/file/file.go

@@ -2,9 +2,10 @@ package file
 
 import (
 	"encoding/json"
-	"github.com/rancher/dynamiclistener"
-	"k8s.io/api/core/v1"
 	"os"
+
+	"github.com/rancher/dynamiclistener"
+	v1 "k8s.io/api/core/v1"
 )
 
 func New(file string) dynamiclistener.TLSStorage {

storage/kubernetes/ca.go

@@ -5,18 +5,27 @@ import (
 	"crypto/x509"
 
 	"github.com/rancher/dynamiclistener/factory"
-	v1controller "github.com/rancher/wrangler/pkg/generated/controllers/core/v1"
+	v1controller "github.com/rancher/wrangler/v3/pkg/generated/controllers/core/v1"
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
+// Deprecated: Use LoadOrGenCAChain instead as it supports intermediate CAs
 func LoadOrGenCA(secrets v1controller.SecretClient, namespace, name string) (*x509.Certificate, crypto.Signer, error) {
+	chain, signer, err := LoadOrGenCAChain(secrets, namespace, name)
+	if err != nil {
+		return nil, nil, err
+	}
+	return chain[0], signer, err
+}
+
+func LoadOrGenCAChain(secrets v1controller.SecretClient, namespace, name string) ([]*x509.Certificate, crypto.Signer, error) {
 	secret, err := getSecret(secrets, namespace, name)
 	if err != nil {
 		return nil, nil, err
 	}
-	return factory.LoadCA(secret.Data[v1.TLSCertKey], secret.Data[v1.TLSPrivateKeyKey])
+	return factory.LoadCAChain(secret.Data[v1.TLSCertKey], secret.Data[v1.TLSPrivateKeyKey])
 }
 
 func LoadOrGenClient(secrets v1controller.SecretClient, namespace, name, cn string, ca *x509.Certificate, key crypto.Signer) (*x509.Certificate, crypto.Signer, error) {
@@ -56,7 +65,7 @@ func createAndStoreClientCert(secrets v1controller.SecretClient, namespace strin
 		return nil, err
 	}
 
-	certPem, keyPem, err := factory.Marshal(cert, key)
+	keyPem, certPem, err := factory.MarshalChain(key, cert, caCert)
 	if err != nil {
 		return nil, err
 	}

storage/kubernetes/controller.go

@@ -6,13 +6,16 @@ import (
 	"time"
 
 	"github.com/rancher/dynamiclistener"
-	"github.com/rancher/wrangler/pkg/generated/controllers/core"
-	v1controller "github.com/rancher/wrangler/pkg/generated/controllers/core/v1"
-	"github.com/rancher/wrangler/pkg/start"
+	"github.com/rancher/dynamiclistener/cert"
+	"github.com/rancher/wrangler/v3/pkg/generated/controllers/core"
+	v1controller "github.com/rancher/wrangler/v3/pkg/generated/controllers/core/v1"
+	"github.com/rancher/wrangler/v3/pkg/start"
 	"github.com/sirupsen/logrus"
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/wait"
+	"k8s.io/client-go/util/retry"
 )
 
 type CoreGetter func() *core.Factory
@@ -23,6 +26,7 @@ func Load(ctx context.Context, secrets v1controller.SecretController, namespace,
 		namespace: namespace,
 		storage:   backing,
 		ctx:       ctx,
+		initSync:  &sync.Once{},
 	}
 	storage.init(secrets)
 	return storage
@@ -34,40 +38,38 @@ func New(ctx context.Context, core CoreGetter, namespace, name string, backing d
 		namespace: namespace,
 		storage:   backing,
 		ctx:       ctx,
+		initSync:  &sync.Once{},
 	}
 
 	// lazy init
 	go func() {
-		for {
-			core := core()
-			if core != nil {
-				storage.init(core.Core().V1().Secret())
-				start.All(ctx, 5, core)
-				return
+		wait.PollImmediateUntilWithContext(ctx, time.Second, func(cxt context.Context) (bool, error) {
+			if coreFactory := core(); coreFactory != nil {
+				storage.init(coreFactory.Core().V1().Secret())
+				return true, start.All(ctx, 5, coreFactory)
 			}
-
-			select {
-			case <-ctx.Done():
-				return
-			case <-time.After(time.Second):
-			}
-		}
+			return false, nil
+		})
 	}()
 
 	return storage
 }
 
 type storage struct {
-	sync.Mutex
+	sync.RWMutex
 
 	namespace, name string
 	storage         dynamiclistener.TLSStorage
-	secrets         v1controller.SecretClient
+	secrets         v1controller.SecretController
 	ctx             context.Context
 	tls             dynamiclistener.TLSFactory
+	initialized     bool
+	initSync        *sync.Once
 }
 
 func (s *storage) SetFactory(tls dynamiclistener.TLSFactory) {
+	s.Lock()
+	defer s.Unlock()
 	s.tls = tls
 }
 
@@ -89,30 +91,64 @@ func (s *storage) init(secrets v1controller.SecretController) {
 	})
 	s.secrets = secrets
 
-	if secret, err := s.storage.Get(); err == nil && secret != nil && len(secret.Data) > 0 {
-		// just ensure there is a secret in k3s
-		if _, err := s.secrets.Get(s.namespace, s.name, metav1.GetOptions{}); errors.IsNotFound(err) {
-			_, _ = s.secrets.Create(&v1.Secret{
-				ObjectMeta: metav1.ObjectMeta{
-					Name:        s.name,
-					Namespace:   s.namespace,
-					Annotations: secret.Annotations,
-				},
-				Type: v1.SecretTypeTLS,
-				Data: secret.Data,
-			})
+	// Asynchronously sync the backing storage to the Kubernetes secret, as doing so inline may
+	// block the listener from accepting new connections if the apiserver becomes unavailable
+	// after the Secrets controller has been initialized. We're not passing around any contexts
+	// here, nor does the controller accept any, so there's no good way to soft-fail with a
+	// reasonable timeout.
+	go s.syncStorage()
+}
+
+func (s *storage) syncStorage() {
+	var updateStorage bool
+	secret, err := s.Get()
+	if err == nil && cert.IsValidTLSSecret(secret) {
+		// local storage had a cached secret, ensure that it exists in Kubernetes
+		_, err := s.secrets.Create(&v1.Secret{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:        s.name,
+				Namespace:   s.namespace,
+				Annotations: secret.Annotations,
+			},
+			Type: v1.SecretTypeTLS,
+			Data: secret.Data,
+		})
+		if err != nil && !errors.IsAlreadyExists(err) {
+			logrus.Warnf("Failed to create Kubernetes secret: %v", err)
+		}
+	} else {
+		// local storage was empty, try to populate it
+		secret, err = s.secrets.Get(s.namespace, s.name, metav1.GetOptions{})
+		if err != nil {
+			if !errors.IsNotFound(err) {
+				logrus.Warnf("Failed to init Kubernetes secret: %v", err)
+			}
+		} else {
+			updateStorage = true
+		}
+	}
+
+	s.Lock()
+	defer s.Unlock()
+	s.initialized = true
+	if updateStorage {
+		if err := s.storage.Update(secret); err != nil {
+			logrus.Warnf("Failed to init backing storage secret: %v", err)
 		}
 	}
 }
 
 func (s *storage) Get() (*v1.Secret, error) {
-	s.Lock()
-	defer s.Unlock()
+	s.RLock()
+	defer s.RUnlock()
 
 	return s.storage.Get()
 }
 
 func (s *storage) targetSecret() (*v1.Secret, error) {
+	s.RLock()
+	defer s.RUnlock()
+
 	existingSecret, err := s.secrets.Get(s.namespace, s.name, metav1.GetOptions{})
 	if errors.IsNotFound(err) {
 		return &v1.Secret{
@@ -120,33 +156,62 @@ func (s *storage) targetSecret() (*v1.Secret, error) {
 				Name:      s.name,
 				Namespace: s.namespace,
 			},
+			Type: v1.SecretTypeTLS,
 		}, nil
 	}
 	return existingSecret, err
 }
 
 func (s *storage) saveInK8s(secret *v1.Secret) (*v1.Secret, error) {
-	if s.secrets == nil {
+	if !s.initComplete() {
+		// Start a goroutine to attempt to save the secret later, once init is complete.
+		// If this was already handled by initComplete, it should be a no-op, or at worst get
+		// merged with the Kubernetes secret.
+		go s.initSync.Do(func() {
+			if err := wait.Poll(100*time.Millisecond, 15*time.Minute, func() (bool, error) {
+				if !s.initComplete() {
+					return false, nil
+				}
+				_, err := s.saveInK8s(secret)
+				return true, err
+			}); err != nil {
+				logrus.Errorf("Failed to save TLS secret after controller init: %v", err)
+			}
+		})
 		return secret, nil
 	}
 
-	if existing, err := s.storage.Get(); err == nil && s.tls != nil {
-		if newSecret, updated, err := s.tls.Merge(existing, secret); err == nil && updated {
-			secret = newSecret
-		}
-	}
-
 	targetSecret, err := s.targetSecret()
 	if err != nil {
 		return nil, err
 	}
 
-	if newSecret, updated, err := s.tls.Merge(targetSecret, secret); err != nil {
-		return nil, err
-	} else if !updated {
-		return newSecret, nil
-	} else {
-		secret = newSecret
+	// if we don't have a TLS factory we can't create certs, so don't bother trying to merge anything,
+	// in favor of just blindly replacing the fields on the Kubernetes secret.
+	if s.tls != nil {
+		// merge new secret with secret from backing storage, if one exists
+		if existing, err := s.Get(); err == nil && cert.IsValidTLSSecret(existing) {
+			if newSecret, updated, err := s.tls.Merge(existing, secret); err == nil && updated {
+				secret = newSecret
+			}
+		}
+
+		// merge new secret with existing secret from Kubernetes, if one exists
+		if cert.IsValidTLSSecret(targetSecret) {
+			if newSecret, updated, err := s.tls.Merge(targetSecret, secret); err != nil {
+				return nil, err
+			} else if !updated {
+				return newSecret, nil
+			} else {
+				secret = newSecret
+			}
+		}
+	}
+
+	// ensure that the merged secret actually contains data before overwriting the existing fields
+	if !cert.IsValidTLSSecret(secret) {
+		logrus.Warnf("Skipping save of TLS secret for %s/%s due to missing certificate data", secret.Namespace, secret.Name)
+		return targetSecret, nil
 	}
 
 	targetSecret.Annotations = secret.Annotations
@@ -154,32 +219,49 @@ func (s *storage) saveInK8s(secret *v1.Secret) (*v1.Secret, error) {
 	targetSecret.Data = secret.Data
 
 	if targetSecret.UID == "" {
-		logrus.Infof("Creating new TLS secret for %v (count: %d): %v", targetSecret.Name, len(targetSecret.Annotations)-1, targetSecret.Annotations)
+		logrus.Infof("Creating new TLS secret for %s/%s (count: %d): %v", targetSecret.Namespace, targetSecret.Name, len(targetSecret.Annotations)-1, targetSecret.Annotations)
 		return s.secrets.Create(targetSecret)
-	} else {
-		logrus.Infof("Updating TLS secret for %v (count: %d): %v", targetSecret.Name, len(targetSecret.Annotations)-1, targetSecret.Annotations)
-		return s.secrets.Update(targetSecret)
 	}
+	logrus.Infof("Updating TLS secret for %s/%s (count: %d): %v", targetSecret.Namespace, targetSecret.Name, len(targetSecret.Annotations)-1, targetSecret.Annotations)
+	return s.secrets.Update(targetSecret)
 }
 
-func (s *storage) Update(secret *v1.Secret) (err error) {
-	s.Lock()
-	defer s.Unlock()
-
-	for i := 0; i < 3; i++ {
-		secret, err = s.saveInK8s(secret)
-		if errors.IsConflict(err) {
-			continue
-		} else if err != nil {
-			return err
+func (s *storage) Update(secret *v1.Secret) error {
+	// Asynchronously update the Kubernetes secret, as doing so inline may block the listener from
+	// accepting new connections if the apiserver becomes unavailable after the Secrets controller
+	// has been initialized. We're not passing around any contexts here, nor does the controller
+	// accept any, so there's no good way to soft-fail with a reasonable timeout.
+	go func() {
+		if err := s.update(secret); err != nil {
+			logrus.Errorf("Failed to save TLS secret for %s/%s: %v", secret.Namespace, secret.Name, err)
 		}
-		break
-	}
+	}()
+	return nil
+}
+
+func isConflictOrAlreadyExists(err error) bool {
+	return errors.IsConflict(err) || errors.IsAlreadyExists(err)
+}
+
+func (s *storage) update(secret *v1.Secret) (err error) {
+	var newSecret *v1.Secret
+	err = retry.OnError(retry.DefaultRetry, isConflictOrAlreadyExists, func() error {
+		newSecret, err = s.saveInK8s(secret)
+		return err
+	})
 
 	if err != nil {
 		return err
 	}
 
-	// update underlying storage
-	return s.storage.Update(secret)
+	// Only hold the lock while updating underlying storage
+	s.Lock()
+	defer s.Unlock()
+	return s.storage.Update(newSecret)
+}
+
+func (s *storage) initComplete() bool {
+	s.RLock()
+	defer s.RUnlock()
+	return s.initialized
 }

storage/memory/memory.go

@@ -2,6 +2,7 @@ package memory
 
 import (
 	"github.com/rancher/dynamiclistener"
+	"github.com/rancher/dynamiclistener/factory"
 	"github.com/sirupsen/logrus"
 	v1 "k8s.io/api/core/v1"
 )
@@ -32,13 +33,31 @@ func (m *memory) Get() (*v1.Secret, error) {
 }
 
 func (m *memory) Update(secret *v1.Secret) error {
-	if m.storage != nil {
-		if err := m.storage.Update(secret); err != nil {
-			return err
+	if isChanged(m.secret, secret) {
+		if m.storage != nil {
+			if err := m.storage.Update(secret); err != nil {
+				return err
+			}
 		}
-	}
 
-	logrus.Infof("Active TLS secret %s (ver=%s) (count %d): %v", secret.Name, secret.ResourceVersion, len(secret.Annotations)-1, secret.Annotations)
-	m.secret = secret
+		logrus.Infof("Active TLS secret %s/%s (ver=%s) (count %d): %v", secret.Namespace, secret.Name, secret.ResourceVersion, len(secret.Annotations)-1, secret.Annotations)
+		m.secret = secret
+	}
 	return nil
 }
+
+func isChanged(old, new *v1.Secret) bool {
+	if old == nil {
+		return true
+	}
+	if old.ResourceVersion == "" {
+		return true
+	}
+	if old.ResourceVersion != new.ResourceVersion {
+		return true
+	}
+	if old.Annotations[factory.Fingerprint] != new.Annotations[factory.Fingerprint] {
+		return true
+	}
+	return false
+}