Merge pull request #55 from genexpr/cherry-pick-filter

Add filter helper method
2025-09-02 13:44:26 +00:00 · 2022-01-07 13:23:23 -05:00 · 2022-01-06 14:23:11 -05:00 · 2022-01-04 12:55:30 -05:00 · 2022-01-04 11:54:07 -05:00 · 2022-01-04 11:53:36 -05:00
17 changed files with 1475 additions and 189 deletions
--- a/README.md
+++ b/README.md
@@ -0,0 +1,10 @@
+# [dynamiclistener](https://github.com/rancher/dynamiclistener)
+
+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).
--- a/cert/cert.go
+++ b/cert/cert.go
@@ -33,7 +33,7 @@ import (
 	"math"
 	"math/big"
 	"net"
-	"path"
+	"path/filepath"
 	"strings"
 	"time"

@@ -45,12 +45,15 @@ 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 +89,15 @@ 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 +109,12 @@ 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")
 	}
+	var expiresAt time.Duration
+	if cfg.ExpiresAt > 0 {
+		expiresAt = time.Duration(cfg.ExpiresAt)
+	} else {
+		expiresAt = duration365d
+	}

 	certTmpl := x509.Certificate{
 		Subject: pkix.Name{
@@ -111,7 +125,7 @@ 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 +133,13 @@ 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
@@ -161,8 +181,8 @@ func GenerateSelfSignedCertKeyWithFixtures(host string, alternateIPs []net.IP, a
 	maxAge := time.Hour * 24 * 365          // one year self-signed certs

 	baseName := fmt.Sprintf("%s_%s_%s", host, strings.Join(ipsToStrings(alternateIPs), "-"), strings.Join(alternateDNS, "-"))
-	certFixturePath := path.Join(fixtureDirectory, baseName+".crt")
-	keyFixturePath := path.Join(fixtureDirectory, baseName+".key")
+	certFixturePath := filepath.Join(fixtureDirectory, baseName+".crt")
+	keyFixturePath := filepath.Join(fixtureDirectory, baseName+".key")
 	if len(fixtureDirectory) > 0 {
 		cert, err := ioutil.ReadFile(certFixturePath)
 		if err == nil {
@@ -271,11 +291,11 @@ 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
--- a/cert/io.go
+++ b/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)
 	}

--- a/factory/ca.go
+++ b/factory/ca.go
@@ -59,16 +59,7 @@ func loadCA() (*x509.Certificate, crypto.Signer, error) {
 	return LoadCerts("./certs/ca.pem", "./certs/ca.key")
 }

-func LoadCerts(certFile, keyFile string) (*x509.Certificate, crypto.Signer, error) {
-	caPem, err := ioutil.ReadFile(certFile)
-	if err != nil {
-		return nil, nil, err
-	}
-	caKey, err := ioutil.ReadFile(keyFile)
-	if err != nil {
-		return nil, nil, err
-	}
-
+func LoadCA(caPem, caKey []byte) (*x509.Certificate, crypto.Signer, error) {
 	key, err := cert.ParsePrivateKeyPEM(caKey)
 	if err != nil {
 		return nil, nil, err
@@ -85,3 +76,16 @@ func LoadCerts(certFile, keyFile string) (*x509.Certificate, crypto.Signer, erro

 	return cert, signer, nil
 }
+
+func LoadCerts(certFile, keyFile string) (*x509.Certificate, crypto.Signer, error) {
+	caPem, err := ioutil.ReadFile(certFile)
+	if err != nil {
+		return nil, nil, err
+	}
+	caKey, err := ioutil.ReadFile(keyFile)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return LoadCA(caPem, caKey)
+}
--- a/factory/cert_utils.go
+++ b/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) {
@@ -37,9 +43,43 @@ 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)
 }

+func NewSignedClientCert(signer crypto.Signer, caCert *x509.Certificate, caKey crypto.Signer, cn string) (*x509.Certificate, error) {
+	serialNumber, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
+	if err != nil {
+		return nil, err
+	}
+
+	parent := x509.Certificate{
+		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
+		KeyUsage:     x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
+		NotAfter:     time.Now().Add(time.Hour * 24 * 365).UTC(),
+		NotBefore:    caCert.NotBefore,
+		SerialNumber: serialNumber,
+		Subject: pkix.Name{
+			CommonName: cn,
+		},
+	}
+
+	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
+	}
+
+	return x509.ParseCertificate(cert)
+}
+
 func NewSignedCert(signer crypto.Signer, caCert *x509.Certificate, caKey crypto.Signer, cn string, orgs []string,
 	domains []string, ips []net.IP) (*x509.Certificate, error) {

@@ -48,12 +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{
@@ -67,7 +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) {
--- a/factory/gen.go
+++ b/factory/gen.go
@@ -5,22 +5,30 @@ import (
 	"crypto/ecdsa"
 	"crypto/elliptic"
 	"crypto/rand"
+	"crypto/sha1"
 	"crypto/sha256"
 	"crypto/x509"
 	"encoding/hex"
 	"encoding/pem"
+	"fmt"
 	"net"
+	"regexp"
 	"sort"
 	"strings"

 	"github.com/rancher/dynamiclistener/cert"
+	"github.com/sirupsen/logrus"
 	v1 "k8s.io/api/core/v1"
 )

 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:]$")
 )

 type TLS struct {
@@ -28,9 +36,13 @@ type TLS struct {
 	CAKey        crypto.Signer
 	CN           string
 	Organization []string
+	FilterCN     func(...string) []string
 }

 func cns(secret *v1.Secret) (cns []string) {
+	if secret == nil {
+		return nil
+	}
 	for k, v := range secret.Annotations {
 		if strings.HasPrefix(k, cnPrefix) {
 			cns = append(cns, v)
@@ -39,16 +51,14 @@ 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)
@@ -57,22 +67,92 @@ func collectCNs(secret *v1.Secret) (domains []string, ips []net.IP, hash string,
 		}
 	}

-	hash = hex.EncodeToString(digest.Sum(nil))
 	return
 }

-func (t *TLS) Merge(secret, other *v1.Secret) (*v1.Secret, bool, error) {
-	return t.AddCN(secret, cns(other)...)
+// 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.
+//
+// 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) {
+	// 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...) {
+		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...) {
+		return target, false, nil
+	}
+
+	// neither cert currently has all the necessary CNs; generate a new one.
+	return t.generateCert(target, mergedCNs...)
 }

-func (t *TLS) AddCN(secret *v1.Secret, cn ...string) (*v1.Secret, bool, error) {
-	var (
-		err 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.generateCert(secret, cns...)
+	return secret, err
+}

-	if !NeedsUpdate(secret, cn...) {
+// 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 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) {
+	cn = t.Filter(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{}
+	}

 	secret = populateCN(secret, cn...)

@@ -81,7 +161,7 @@ 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
 	}
@@ -101,7 +181,7 @@ func (t *TLS) AddCN(secret *v1.Secret, cn ...string) (*v1.Secret, bool, error) {
 	}
 	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
 }
@@ -116,18 +196,35 @@ func populateCN(secret *v1.Secret, cn ...string) *v1.Secret {
 		secret.Annotations = map[string]string{}
 	}
 	for _, cn := range cn {
-		secret.Annotations[cnPrefix+cn] = cn
+		if cnRegexp.MatchString(cn) {
+			secret.Annotations[getAnnotationKey(cn)] = cn
+		} else {
+			logrus.Errorf("dropping invalid CN: %s", cn)
+		}
 	}
 	return secret
 }

-func NeedsUpdate(secret *v1.Secret, cn ...string) bool {
-	if secret.Annotations[static] == "true" {
-		return false
+// 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 {
+	return secret.Annotations[Static] == "true"
+}
+
+// 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
 	}

 	for _, cn := range cn {
-		if secret.Annotations[cnPrefix+cn] == "" {
+		if secret.Annotations[getAnnotationKey(cn)] == "" {
+			if maxSANs > 0 && len(cns(secret)) >= maxSANs {
+				return false
+			}
 			return true
 		}
 	}
@@ -149,6 +246,7 @@ func getPrivateKey(secret *v1.Secret) (crypto.Signer, error) {
 	return NewPrivateKey()
 }

+// Marshal returns the given cert and key as byte slices.
 func Marshal(x509Cert *x509.Certificate, privateKey crypto.Signer) ([]byte, []byte, error) {
 	certBlock := pem.Block{
 		Type:  CertificateBlockType,
@@ -163,6 +261,26 @@ 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]
+}
--- a/filter.go
+++ b/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
+	}
+}
--- a/go.mod
+++ b/go.mod
@@ -1,11 +1,11 @@
 module github.com/rancher/dynamiclistener

-go 1.12
+go 1.16

 require (
-	github.com/rancher/wrangler v0.1.4
-	github.com/rancher/wrangler-api v0.2.0
-	github.com/sirupsen/logrus v1.4.1
-	k8s.io/api v0.0.0-20190409021203-6e4e0e4f393b
-	k8s.io/apimachinery v0.0.0-20190404173353-6a84e37a896d
+	github.com/rancher/wrangler v0.8.9
+	github.com/sirupsen/logrus v1.4.2
+	golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2
+	k8s.io/api v0.18.8
+	k8s.io/apimachinery v0.18.8
 )
--- a/go.sum
+++ b/go.sum
@@ -1,132 +1,622 @@
+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/360EntSecGroup-Skylar/excelize v1.4.1/go.mod h1:vnax29X2usfl7HHkBrX5EvSCJcmH3dT9luvxzu8iGAE=
+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=
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--- a/listener.go
+++ b/listener.go
@@ -1,14 +1,18 @@
 package dynamiclistener

 import (
+	"context"
 	"crypto"
 	"crypto/tls"
 	"crypto/x509"
 	"net"
 	"net/http"
+	"runtime"
 	"strings"
 	"sync"
+	"time"

+	"github.com/rancher/dynamiclistener/cert"
 	"github.com/rancher/dynamiclistener/factory"
 	"github.com/sirupsen/logrus"
 	v1 "k8s.io/api/core/v1"
@@ -19,15 +23,16 @@ type TLSStorage interface {
 	Update(secret *v1.Secret) error
 }

-type SetFactory interface {
-	SetFactory(tls *factory.TLS)
+type TLSFactory interface {
+	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 Config struct {
-	CN           string
-	Organization []string
-	TLSConfig    tls.Config
-	SANs         []string
+type SetFactory interface {
+	SetFactory(tls TLSFactory)
 }

 func NewListener(l net.Listener, storage TLSStorage, caCert *x509.Certificate, caKey crypto.Signer, config Config) (net.Listener, http.Handler, error) {
@@ -37,6 +42,9 @@ func NewListener(l net.Listener, storage TLSStorage, caCert *x509.Certificate, c
 	if len(config.Organization) == 0 {
 		config.Organization = []string{"dynamic"}
 	}
+	if config.TLSConfig == nil {
+		config.TLSConfig = &tls.Config{}
+	}

 	dynamicListener := &listener{
 		factory: &factory.TLS{
@@ -44,38 +52,223 @@ func NewListener(l net.Listener, storage TLSStorage, caCert *x509.Certificate, c
 			CAKey:        caKey,
 			CN:           config.CN,
 			Organization: config.Organization,
+			FilterCN:     allowDefaultSANs(config.SANs, config.FilterCN),
 		},
 		Listener:  l,
 		storage:   &nonNil{storage: storage},
 		sans:      config.SANs,
+		maxSANs:   config.MaxSANs,
 		tlsConfig: config.TLSConfig,
 	}
+	if dynamicListener.tlsConfig == nil {
+		dynamicListener.tlsConfig = &tls.Config{}
+	}
 	dynamicListener.tlsConfig.GetCertificate = dynamicListener.getCertificate

+	if config.CloseConnOnCertChange {
+		if len(dynamicListener.tlsConfig.Certificates) == 0 {
+			dynamicListener.tlsConfig.NextProtos = []string{"http/1.1"}
+		}
+		dynamicListener.conns = map[int]*closeWrapper{}
+	}
+
 	if setter, ok := storage.(SetFactory); ok {
 		setter.SetFactory(dynamicListener.factory)
 	}

-	return tls.NewListener(dynamicListener, &dynamicListener.tlsConfig), dynamicListener.cacheHandler(), nil
+	if config.RegenerateCerts != nil && config.RegenerateCerts() {
+		if err := dynamicListener.regenerateCerts(); err != nil {
+			return nil, nil, err
+		}
+	}
+
+	if config.ExpirationDaysCheck == 0 {
+		config.ExpirationDaysCheck = 30
+	}
+
+	tlsListener := tls.NewListener(dynamicListener.WrapExpiration(config.ExpirationDaysCheck), dynamicListener.tlsConfig)
+
+	return tlsListener, dynamicListener.cacheHandler(), nil
+}
+
+func allowDefaultSANs(sans []string, next func(...string) []string) func(...string) []string {
+	if next == nil {
+		return nil
+	} else if len(sans) == 0 {
+		return next
+	}
+
+	sanMap := map[string]bool{}
+	for _, san := range sans {
+		sanMap[san] = true
+	}
+
+	return func(s ...string) []string {
+		var (
+			good    []string
+			unknown []string
+		)
+		for _, s := range s {
+			if sanMap[s] {
+				good = append(good, s)
+			} else {
+				unknown = append(unknown, s)
+			}
+		}
+
+		return append(good, next(unknown...)...)
+	}
+}
+
+type cancelClose struct {
+	cancel func()
+	net.Listener
+}
+
+func (c *cancelClose) Close() error {
+	c.cancel()
+	return c.Listener.Close()
+}
+
+type Config struct {
+	CN                    string
+	Organization          []string
+	TLSConfig             *tls.Config
+	SANs                  []string
+	MaxSANs               int
+	ExpirationDaysCheck   int
+	CloseConnOnCertChange bool
+	RegenerateCerts       func() bool
+	FilterCN              func(...string) []string
 }

 type listener struct {
 	sync.RWMutex
 	net.Listener

-	factory   *factory.TLS
+	conns    map[int]*closeWrapper
+	connID   int
+	connLock sync.Mutex
+
+	factory   TLSFactory
 	storage   TLSStorage
 	version   string
-	tlsConfig tls.Config
+	tlsConfig *tls.Config
 	cert      *tls.Certificate
 	sans      []string
+	maxSANs   int
 	init      sync.Once
 }

+func (l *listener) WrapExpiration(days int) net.Listener {
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		// busy-wait for certificate preload to complete
+		for l.cert == nil {
+			runtime.Gosched()
+		}
+
+		for {
+			wait := 6 * time.Hour
+			if err := l.checkExpiration(days); err != nil {
+				logrus.Errorf("failed to check and renew dynamic cert: %v", 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():
+				return
+			case <-time.After(wait):
+			}
+		}
+	}()
+
+	return &cancelClose{
+		cancel:   cancel,
+		Listener: l,
+	}
+}
+
+// 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()
+
+	if days == 0 {
+		return nil
+	}
+
+	if l.cert == nil {
+		return nil
+	}
+
+	secret, err := l.storage.Get()
+	if err != nil {
+		return err
+	}
+
+	keyPair, err := tls.X509KeyPair(secret.Data[v1.TLSCertKey], secret.Data[v1.TLSPrivateKeyKey])
+	if err != nil {
+		return err
+	}
+
+	certParsed, err := x509.ParseCertificate(keyPair.Certificate[0])
+	if err != nil {
+		return err
+	}
+
+	if cert.IsCertExpired(certParsed, days) {
+		secret, err := l.factory.Renew(secret)
+		if err != nil {
+			return err
+		}
+		if err := l.storage.Update(secret); err != nil {
+			return err
+		}
+		// clear version to force cert reload
+		l.version = ""
+	}
+
+	return nil
+}
+
 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("failed to update cert with configured SANs: %v", err)
+				return
+			}
+			if _, err := l.loadCert(nil); err != nil {
+				logrus.Errorf("failed to preload certificate: %v", err)
+			}
 		}
 	})

@@ -97,24 +290,68 @@ func (l *listener) Accept() (net.Conn, error) {

 	if !strings.Contains(host, ":") {
 		if err := l.updateCert(host); err != nil {
-			logrus.Infof("failed to create TLS cert for: %s", host)
+			logrus.Errorf("failed to update cert with listener address: %v", err)
 		}
 	}

+	if l.conns != nil {
+		conn = l.wrap(conn)
+	}
+
 	return conn, nil
 }

+func (l *listener) wrap(conn net.Conn) net.Conn {
+	l.connLock.Lock()
+	defer l.connLock.Unlock()
+	l.connID++
+
+	wrapper := &closeWrapper{
+		Conn: conn,
+		id:   l.connID,
+		l:    l,
+	}
+	l.conns[l.connID] = wrapper
+
+	return wrapper
+}
+
+type closeWrapper struct {
+	net.Conn
+	id    int
+	l     *listener
+	ready bool
+}
+
+func (c *closeWrapper) close() error {
+	delete(c.l.conns, c.id)
+	return c.Conn.Close()
+}
+
+func (c *closeWrapper) Close() error {
+	c.l.connLock.Lock()
+	defer c.l.connLock.Unlock()
+	return c.close()
+}
+
 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("failed to update cert with TLS ServerName: %v", err)
 			return nil, err
 		}
 	}

-	return l.loadCert()
+	return l.loadCert(newConn)
 }

 func (l *listener) updateCert(cn ...string) error {
+	cn = l.factory.Filter(cn...)
+	if len(cn) == 0 {
+		return nil
+	}
+
 	l.RLock()
 	defer l.RUnlock()

@@ -123,7 +360,7 @@ func (l *listener) updateCert(cn ...string) error {
 		return err
 	}

-	if !factory.NeedsUpdate(secret, cn...) {
+	if factory.IsStatic(secret) || !factory.NeedsUpdate(l.maxSANs, secret, cn...) {
 		return nil
 	}

@@ -141,14 +378,16 @@ 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 = ""
 	}

 	return nil
 }

-func (l *listener) loadCert() (*tls.Certificate, error) {
+func (l *listener) loadCert(currentConn net.Conn) (*tls.Certificate, error) {
 	l.RLock()
 	defer l.RUnlock()

@@ -156,7 +395,7 @@ 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
 	}

@@ -169,7 +408,7 @@ 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
 	}

@@ -178,7 +417,22 @@ 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.conns[currentConn.(*closeWrapper).id].ready = true
+		l.connLock.Unlock()
+	}
+
 	l.cert = &cert
+	l.version = secret.ResourceVersion
 	return l.cert, nil
 }

@@ -191,7 +445,15 @@ func (l *listener) cacheHandler() http.Handler {

 		ip := net.ParseIP(h)
 		if len(ip) > 0 {
-			l.updateCert(h)
+			for _, v := range req.Header["User-Agent"] {
+				if strings.Contains(strings.ToLower(v), "mozilla") {
+					return
+				}
+			}
+
+			if err := l.updateCert(h); err != nil {
+				logrus.Errorf("failed to update cert with HTTP request Host header: %v", err)
+			}
 		}
 	})
 }
--- a/redirect.go
+++ b/redirect.go
@@ -11,8 +11,10 @@ import (
 func HTTPRedirect(next http.Handler) http.Handler {
 	return http.HandlerFunc(
 		func(rw http.ResponseWriter, r *http.Request) {
-			if r.Header.Get("x-Forwarded-Proto") == "https" ||
+			if r.TLS != nil ||
+				r.Header.Get("x-Forwarded-Proto") == "https" ||
 				r.Header.Get("x-Forwarded-Proto") == "wss" ||
+				strings.HasPrefix(r.URL.Path, "/.well-known/") ||
 				strings.HasPrefix(r.URL.Path, "/ping") ||
 				strings.HasPrefix(r.URL.Path, "/health") {
 				next.ServeHTTP(rw, r)
--- a/server/server.go
+++ b/server/server.go
@@ -2,45 +2,75 @@ package server

 import (
 	"context"
+	"crypto"
+	"crypto/tls"
+	"crypto/x509"
 	"fmt"
+	"log"
+	"net"
 	"net/http"

 	"github.com/rancher/dynamiclistener"
 	"github.com/rancher/dynamiclistener/factory"
+	"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"
 	"github.com/sirupsen/logrus"
+	"golang.org/x/crypto/acme/autocert"
 )

-func ListenAndServe(ctx context.Context, httpsPort, httpPort int, handler http.Handler) error {
-	var (
-		// https listener will change this if http is enabled
-		targetHandler = handler
-	)
+type ListenOpts struct {
+	CA                *x509.Certificate
+	CAKey             crypto.Signer
+	Storage           dynamiclistener.TLSStorage
+	Secrets           v1.SecretController
+	CertNamespace     string
+	CertName          string
+	CANamespace       string
+	CAName            string
+	CertBackup        string
+	AcmeDomains       []string
+	BindHost          string
+	NoRedirect        bool
+	TLSListenerConfig dynamiclistener.Config
+}
+
+func ListenAndServe(ctx context.Context, httpsPort, httpPort int, handler http.Handler, opts *ListenOpts) error {
+	if opts == nil {
+		opts = &ListenOpts{}
+	}
+
+	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 {
-		caCert, caKey, err := factory.LoadOrGenCA()
+		tlsTCPListener, err := dynamiclistener.NewTCPListener(opts.BindHost, httpsPort)
 		if err != nil {
 			return err
 		}

-		tlsTCPListener, err := dynamiclistener.NewTCPListener("0.0.0.0", httpsPort)
+		tlsTCPListener, handler, err = getTLSListener(ctx, tlsTCPListener, handler, *opts)
 		if err != nil {
 			return err
 		}

-		dynListener, dynHandler, err := dynamiclistener.NewListener(tlsTCPListener, memory.New(), caCert, caKey, dynamiclistener.Config{})
-		if err != nil {
-			return err
+		if !opts.NoRedirect {
+			handler = dynamiclistener.HTTPRedirect(handler)
 		}

-		targetHandler = wrapHandler(dynHandler, handler)
 		tlsServer := http.Server{
-			Handler: targetHandler,
+			Handler:  handler,
+			ErrorLog: errorLog,
 		}
-		targetHandler = dynamiclistener.HTTPRedirect(targetHandler)

 		go func() {
-			logrus.Infof("Listening on 0.0.0.0:%d", httpsPort)
-			err := tlsServer.Serve(dynListener)
+			logrus.Infof("Listening on %s:%d", opts.BindHost, httpsPort)
+			err := tlsServer.Serve(tlsTCPListener)
 			if err != http.ErrServerClosed && err != nil {
 				logrus.Fatalf("https server failed: %v", err)
 			}
@@ -53,11 +83,12 @@ func ListenAndServe(ctx context.Context, httpsPort, httpPort int, handler http.H

 	if httpPort > 0 {
 		httpServer := http.Server{
-			Addr:    fmt.Sprintf("0.0.0.0:%d", httpPort),
-			Handler: targetHandler,
+			Addr:     fmt.Sprintf("%s:%d", opts.BindHost, httpPort),
+			Handler:  handler,
+			ErrorLog: errorLog,
 		}
 		go func() {
-			logrus.Infof("Listening on 0.0.0.0:%d", httpPort)
+			logrus.Infof("Listening on %s:%d", opts.BindHost, httpPort)
 			err := httpServer.ListenAndServe()
 			if err != http.ErrServerClosed && err != nil {
 				logrus.Fatalf("http server failed: %v", err)
@@ -72,9 +103,118 @@ func ListenAndServe(ctx context.Context, httpsPort, httpPort int, handler http.H
 	return nil
 }

+func getTLSListener(ctx context.Context, tcp net.Listener, handler http.Handler, opts ListenOpts) (net.Listener, http.Handler, error) {
+	if len(opts.TLSListenerConfig.TLSConfig.NextProtos) == 0 {
+		opts.TLSListenerConfig.TLSConfig.NextProtos = []string{"h2", "http/1.1"}
+	}
+
+	if len(opts.TLSListenerConfig.TLSConfig.Certificates) > 0 {
+		return tls.NewListener(tcp, opts.TLSListenerConfig.TLSConfig), handler, nil
+	}
+
+	if len(opts.AcmeDomains) > 0 {
+		return acmeListener(tcp, handler, opts)
+	}
+
+	storage := opts.Storage
+	if storage == nil {
+		storage = newStorage(ctx, opts)
+	}
+
+	caCert, caKey, err := getCA(opts)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	listener, dynHandler, err := dynamiclistener.NewListener(tcp, storage, caCert, caKey, opts.TLSListenerConfig)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	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
+	}
+
+	if opts.Secrets == nil {
+		return factory.LoadOrGenCA()
+	}
+
+	if opts.CAName == "" {
+		opts.CAName = "serving-ca"
+	}
+
+	if opts.CANamespace == "" {
+		opts.CANamespace = opts.CertNamespace
+	}
+
+	if opts.CANamespace == "" {
+		opts.CANamespace = "kube-system"
+	}
+
+	return kubernetes.LoadOrGenCA(opts.Secrets, opts.CANamespace, opts.CAName)
+}
+
+func newStorage(ctx context.Context, opts ListenOpts) dynamiclistener.TLSStorage {
+	var result dynamiclistener.TLSStorage
+	if opts.CertBackup == "" {
+		result = memory.New()
+	} else {
+		result = memory.NewBacked(file.New(opts.CertBackup))
+	}
+
+	if opts.Secrets == nil {
+		return result
+	}
+
+	if opts.CertName == "" {
+		opts.CertName = "serving-cert"
+	}
+
+	if opts.CertNamespace == "" {
+		opts.CertNamespace = "kube-system"
+	}
+
+	return kubernetes.Load(ctx, opts.Secrets, opts.CertNamespace, opts.CertName, result)
+}
+
 func wrapHandler(handler http.Handler, next http.Handler) http.Handler {
 	return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
 		handler.ServeHTTP(rw, req)
 		next.ServeHTTP(rw, req)
 	})
 }
+
+func acmeListener(tcp net.Listener, handler http.Handler, opts ListenOpts) (net.Listener, http.Handler, error) {
+	hosts := map[string]bool{}
+	for _, domain := range opts.AcmeDomains {
+		hosts[domain] = true
+	}
+
+	manager := autocert.Manager{
+		Cache: autocert.DirCache("certs-cache"),
+		Prompt: func(tosURL string) bool {
+			return true
+		},
+		HostPolicy: func(ctx context.Context, host string) error {
+			if !hosts[host] {
+				return fmt.Errorf("host %s is not configured", host)
+			}
+			return nil
+		},
+	}
+
+	opts.TLSListenerConfig.TLSConfig.GetCertificate = func(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
+		if hello.ServerName == "localhost" || hello.ServerName == "" {
+			newHello := *hello
+			newHello.ServerName = opts.AcmeDomains[0]
+			return manager.GetCertificate(&newHello)
+		}
+		return manager.GetCertificate(hello)
+	}
+
+	return tls.NewListener(tcp, opts.TLSListenerConfig.TLSConfig), manager.HTTPHandler(handler), nil
+}
--- a/storage/file/file.go
+++ b/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 {
@@ -39,4 +40,3 @@ func (s *storage) Update(secret *v1.Secret) error {

 	return json.NewEncoder(f).Encode(secret)
 }
-
--- a/storage/kubernetes/ca.go
+++ b/storage/kubernetes/ca.go
@@ -0,0 +1,103 @@
+package kubernetes
+
+import (
+	"crypto"
+	"crypto/x509"
+
+	"github.com/rancher/dynamiclistener/factory"
+	v1controller "github.com/rancher/wrangler/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"
+)
+
+func LoadOrGenCA(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])
+}
+
+func LoadOrGenClient(secrets v1controller.SecretClient, namespace, name, cn string, ca *x509.Certificate, key crypto.Signer) (*x509.Certificate, crypto.Signer, error) {
+	secret, err := getClientSecret(secrets, namespace, name, cn, ca, key)
+	if err != nil {
+		return nil, nil, err
+	}
+	return factory.LoadCA(secret.Data[v1.TLSCertKey], secret.Data[v1.TLSPrivateKeyKey])
+}
+
+func getClientSecret(secrets v1controller.SecretClient, namespace, name, cn string, caCert *x509.Certificate, caKey crypto.Signer) (*v1.Secret, error) {
+	s, err := secrets.Get(namespace, name, metav1.GetOptions{})
+	if !errors.IsNotFound(err) {
+		return s, err
+	}
+
+	return createAndStoreClientCert(secrets, namespace, name, cn, caCert, caKey)
+}
+
+func getSecret(secrets v1controller.SecretClient, namespace, name string) (*v1.Secret, error) {
+	s, err := secrets.Get(namespace, name, metav1.GetOptions{})
+	if !errors.IsNotFound(err) {
+		return s, err
+	}
+
+	return createAndStore(secrets, namespace, name)
+}
+
+func createAndStoreClientCert(secrets v1controller.SecretClient, namespace string, name, cn string, caCert *x509.Certificate, caKey crypto.Signer) (*v1.Secret, error) {
+	key, err := factory.NewPrivateKey()
+	if err != nil {
+		return nil, err
+	}
+
+	cert, err := factory.NewSignedClientCert(key, caCert, caKey, cn)
+	if err != nil {
+		return nil, err
+	}
+
+	certPem, keyPem, err := factory.Marshal(cert, key)
+	if err != nil {
+		return nil, err
+	}
+
+	secret := &v1.Secret{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      name,
+			Namespace: namespace,
+		},
+		Data: map[string][]byte{
+			v1.TLSCertKey:       certPem,
+			v1.TLSPrivateKeyKey: keyPem,
+		},
+		Type: v1.SecretTypeTLS,
+	}
+
+	return secrets.Create(secret)
+}
+
+func createAndStore(secrets v1controller.SecretClient, namespace string, name string) (*v1.Secret, error) {
+	ca, cert, err := factory.GenCA()
+	if err != nil {
+		return nil, err
+	}
+
+	certPem, keyPem, err := factory.Marshal(ca, cert)
+	if err != nil {
+		return nil, err
+	}
+
+	secret := &v1.Secret{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      name,
+			Namespace: namespace,
+		},
+		Data: map[string][]byte{
+			v1.TLSCertKey:       certPem,
+			v1.TLSPrivateKeyKey: keyPem,
+		},
+		Type: v1.SecretTypeTLS,
+	}
+
+	return secrets.Create(secret)
+}
--- a/storage/kubernetes/controller.go
+++ b/storage/kubernetes/controller.go
@@ -6,19 +6,28 @@ import (
 	"time"

 	"github.com/rancher/dynamiclistener"
-	"github.com/rancher/dynamiclistener/factory"
-	"github.com/rancher/wrangler-api/pkg/generated/controllers/core"
-	v1controller "github.com/rancher/wrangler-api/pkg/generated/controllers/core/v1"
+	"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/sirupsen/logrus"
 	v1 "k8s.io/api/core/v1"
-	"k8s.io/apimachinery/pkg/api/equality"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )

 type CoreGetter func() *core.Factory

+func Load(ctx context.Context, secrets v1controller.SecretController, namespace, name string, backing dynamiclistener.TLSStorage) dynamiclistener.TLSStorage {
+	storage := &storage{
+		name:      name,
+		namespace: namespace,
+		storage:   backing,
+		ctx:       ctx,
+	}
+	storage.init(secrets)
+	return storage
+}
+
 func New(ctx context.Context, core CoreGetter, namespace, name string, backing dynamiclistener.TLSStorage) dynamiclistener.TLSStorage {
 	storage := &storage{
 		name:      name,
@@ -33,7 +42,7 @@ func New(ctx context.Context, core CoreGetter, namespace, name string, backing d
 			core := core()
 			if core != nil {
 				storage.init(core.Core().V1().Secret())
-				start.All(ctx, 5, core)
+				_ = start.All(ctx, 5, core)
 				return
 			}

@@ -55,10 +64,10 @@ type storage struct {
 	storage         dynamiclistener.TLSStorage
 	secrets         v1controller.SecretClient
 	ctx             context.Context
-	tls             *factory.TLS
+	tls             dynamiclistener.TLSFactory
 }

-func (s *storage) SetFactory(tls *factory.TLS) {
+func (s *storage) SetFactory(tls dynamiclistener.TLSFactory) {
 	s.tls = tls
 }

@@ -80,18 +89,31 @@ 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,
-			})
+	secret, err := s.storage.Get()
+	if err == nil && secret != nil && len(secret.Data) > 0 {
+		// 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 {
+			logrus.Warnf("Failed to init Kubernetes secret: %v", err)
+			return
+		}
+
+		if err := s.storage.Update(secret); err != nil {
+			logrus.Warnf("Failed to init backing storage secret: %v", err)
 		}
 	}
 }
@@ -121,20 +143,31 @@ func (s *storage) saveInK8s(secret *v1.Secret) (*v1.Secret, error) {
 		return secret, nil
 	}

-	if existing, err := s.storage.Get(); err == nil && s.tls != nil {
-		if newSecret, updated, err := s.tls.Merge(secret, existing); err == nil && updated {
-			secret = newSecret
-		}
-	}
-
 	targetSecret, err := s.targetSecret()
 	if err != nil {
 		return nil, err
 	}

-	if equality.Semantic.DeepEqual(targetSecret.Annotations, secret.Annotations) &&
-		equality.Semantic.DeepEqual(targetSecret.Data, secret.Data) {
-		return secret, nil
+	// 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.storage.Get(); err == nil && existing != nil && len(existing.Data) > 0 {
+			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 len(targetSecret.Data) > 0 {
+			if newSecret, updated, err := s.tls.Merge(targetSecret, secret); err != nil {
+				return nil, err
+			} else if !updated {
+				return newSecret, nil
+			} else {
+				secret = newSecret
+			}
+		}
 	}

 	targetSecret.Annotations = secret.Annotations
@@ -144,10 +177,9 @@ func (s *storage) saveInK8s(secret *v1.Secret) (*v1.Secret, error) {
 	if targetSecret.UID == "" {
 		logrus.Infof("Creating new TLS secret for %v (count: %d): %v", 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 %v (count: %d): %v", targetSecret.Name, len(targetSecret.Annotations)-1, targetSecret.Annotations)
+	return s.secrets.Update(targetSecret)
 }

 func (s *storage) Update(secret *v1.Secret) (err error) {
--- a/storage/memory/memory.go
+++ b/storage/memory/memory.go
@@ -32,13 +32,15 @@ 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 m.secret == nil || m.secret.ResourceVersion == "" || m.secret.ResourceVersion != secret.ResourceVersion {
+		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 (ver=%s) (count %d): %v", secret.Name, secret.ResourceVersion, len(secret.Annotations)-1, secret.Annotations)
+		m.secret = secret
+	}
 	return nil
 }
--- a/storage/static/static.go
+++ b/storage/static/static.go
@@ -0,0 +1,36 @@
+package static
+
+import (
+	"github.com/rancher/dynamiclistener/factory"
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+type Storage struct {
+	Secret *v1.Secret
+}
+
+func New(certPem, keyPem []byte) *Storage {
+	return &Storage{
+		Secret: &v1.Secret{
+			ObjectMeta: metav1.ObjectMeta{
+				Annotations: map[string]string{
+					factory.Static: "true",
+				},
+			},
+			Data: map[string][]byte{
+				v1.TLSCertKey:       certPem,
+				v1.TLSPrivateKeyKey: keyPem,
+			},
+			Type: v1.SecretTypeTLS,
+		},
+	}
+}
+
+func (s *Storage) Get() (*v1.Secret, error) {
+	return s.Secret, nil
+}
+
+func (s *Storage) Update(_ *v1.Secret) error {
+	return nil
+}
Author	SHA1	Message	Date
Max Sokolovsky	a73b7d7f4c	Merge pull request #55 from genexpr/cherry-pick-filter Add filter helper method	2022-01-07 13:23:23 -05:00
Darren Shepherd	b0dbb8fd60	Add filter helper method (cherry picked from commit `9b1b7d3132`)	2022-01-06 14:23:11 -05:00
Max Sokolovsky	7d99790dba	Merge pull request #54 from genexpr/merge-cert-updates-from-master Cherry-pick commits that allow setting certificate expiration date	2022-01-04 12:55:30 -05:00
Max Sokolovsky	2c1c2032dc	Use Go 1.16	2022-01-04 11:54:07 -05:00
Max Sokolovsky	acdc51060f	update config to allow for specifying experiation in days (#53 ) (cherry picked from commit `148d38076d`)	2022-01-04 11:53:36 -05:00
Max Sokolovsky	3bf34c8ff9	Fix listenAndServe certificate expiration by preloading certs Signed-off-by: Brad Davidson <brad.davidson@rancher.com> (cherry picked from commit `284cc004e8`)	2022-01-04 11:53:23 -05:00
Max Sokolovsky	097ec29ed8	Add README (cherry picked from commit `bbac29e0fa`)	2022-01-04 11:52:40 -05:00
Max Sokolovsky	500cf6baf3	Fix defaultNewSignedCertExpirationDays const This a quick fix for `2644a6ed16` (cherry picked from commit `f147aa4166`)	2022-01-04 11:47:37 -05:00
Max Sokolovsky	ada93274e5	Allow for default expiration days to be loaded from env (cherry picked from commit `2644a6ed16`)	2022-01-04 11:42:50 -05:00
Brian Downs	2df892b5d7	Add ability to force cert regeneration (#43 ) (#48 ) * add ability to force cert regeneration	2021-11-15 14:05:41 -07:00
Brad Davidson	cec44b5e30	Update wrangler to v0.8.3 Signed-off-by: Brad Davidson <brad.davidson@rancher.com>	2021-07-13 15:16:59 -07:00
Sjoerd Simons	8056fb92e8	Accept IPv6 address as CN names Expand the cnRegexp to also accept ipv6 addresses such as: * ::1 * 2a00:1450:400e:80e:: * 2a00:1450:400e:80e::200e Fixes: #37 Signed-off-by: Sjoerd Simons <sjoerd@collabora.com> (cherry picked from commit `dc7452dbb8`)	2021-06-14 14:43:06 -07:00
Dan Ramich	51bda41d9c	Merge pull request #34 from dramich/wrangler Update wrangler and drop wrangler-api	2021-04-23 08:46:33 -06:00
Dan Ramich	624606ae5a	Update wrangler and drop wrangler-api	2021-04-22 15:44:19 -06:00
Hussein Galal	fc8cf5f3ea	Merge pull request #33 from galal-hussein/fix_load_certs Fixing loading certs to work with etcd only nodes	2021-03-05 22:54:49 +02:00
galal-hussein	3878ff2a1f	Fixing loading certs	2021-03-05 22:39:13 +02:00
Hussein Galal	1b2460c151	Merge pull request #32 from galal-hussein/fix_resversion Add check to update dynamic listener cert in etcd only nodes	2021-03-01 21:58:18 +02:00
galal-hussein	e34610a1ae	Add check to update dynamic listener cert in etcd only nodes	2021-03-01 21:52:45 +02:00
Brad Davidson	7c224dcdfb	Merge pull request #29 from brandond/force_reissue_0.2 Allow forcing cert reissuance (v0.2 backport)	2020-08-11 12:58:42 -07:00
Brad Davidson	53f6b38760	Allow forcing cert reissuance (#28 ) Refreshing the cert should force renewal as opposed to returning early if the SANs aren't changing. This is currently breaking refresh of expired certs as per: https://github.com/rancher/k3s/issues/1621#issuecomment-669464318 Signed-off-by: Brad Davidson <brad.davidson@rancher.com>	2020-08-10 17:12:39 -07:00
Darren Shepherd	479ab335d6	Add LoadOrGenClient to handle client cert generation	2020-08-10 17:12:39 -07:00
Darren Shepherd	2bfb7bd0cb	Fix error masking issue Also don't do an extra lookup of TLS secret after update.	2020-08-10 17:12:39 -07:00
Knic Knic	94e23c7edb	fix certpath generation for windows	2020-04-25 22:59:52 -07:00
Darren Shepherd	52ede5ec92	Merge pull request #22 from ibuildthecloud/master Always allow configured SANs regardless of the FilterCN	2020-04-17 19:33:42 -07:00
Darren Shepherd	5c222d5753	Don't parse x509 cert on each request	2020-04-17 19:31:42 -07:00
Darren Shepherd	74a61a850d	Always allow configured SANs regardless of the FilterCN	2020-04-17 19:31:31 -07:00
Darren Shepherd	4436fc6b48	Merge pull request #21 from ibuildthecloud/master Add ability to confirm adding new CNs	2020-04-02 22:10:05 -07:00
Darren Shepherd	4bac3f291f	Add ability to confirm adding new CNs	2020-04-02 22:08:36 -07:00
Darren Shepherd	c992ce309c	Reject bad CNs that will prevent the secret from being saved.	2020-04-02 22:07:45 -07:00
Darren Shepherd	763229ddcd	Merge pull request #20 from ibuildthecloud/master Add ability to limit the maximum number of SANs	2020-03-18 23:17:31 -07:00
Darren Shepherd	171fcf6b79	If connection closing is enabled then don't support HTTP/2	2020-03-18 23:16:38 -07:00
Darren Shepherd	05d7922a86	Add ability to limit the maximum number of SANs	2020-03-18 23:16:38 -07:00
Darren Shepherd	1e67d402dc	Merge pull request #19 from ibuildthecloud/master For web browser based requests do not consider IPs in host headers	2020-03-14 10:17:03 -07:00
Darren Shepherd	7e3fc0c594	For web browser based requests do not consider IPs in host headers	2020-03-14 10:16:11 -07:00
Darren Shepherd	111c5b43e9	Merge pull request #18 from ibuildthecloud/dropconn Wrong lock used to protect conn map	2020-02-13 09:53:08 -07:00
Darren Shepherd	bd73d0d4bc	Wrong lock used to protect conn map	2020-02-13 09:52:45 -07:00
Darren Shepherd	5276ad483a	Merge pull request #17 from ibuildthecloud/dropconn Add option to close connections on cert change	2020-02-12 14:13:44 -07:00
Darren Shepherd	8545ce98db	Add option to close connections on cert change	2020-02-12 14:00:40 -07:00
Darren Shepherd	3f92468568	Merge pull request #16 from ibuildthecloud/master Fix acme listener	2020-02-07 14:28:38 -07:00
Darren Shepherd	5ba69b1c5f	Fix acme listener	2020-02-07 14:20:45 -07:00
Darren Shepherd	6281628cd4	Merge pull request #15 from ibuildthecloud/master Add BindHost option	2020-02-05 23:12:55 -07:00
Darren Shepherd	0b114dc0c2	Add BindHost option	2020-02-05 23:11:51 -07:00
Darren Shepherd	ece289ed54	Merge pull request #14 from ibuildthecloud/master Fix merging of the k8s secret to reduce the number of writes	2020-02-04 12:49:56 -07:00
Darren Shepherd	bc68bf5499	Fix merging of the k8s secret to reduce the number of writes	2020-02-04 12:48:38 -07:00
Darren Shepherd	795bb90214	Merge pull request #13 from ibuildthecloud/master Add more helpers	2020-01-30 22:41:53 -07:00
Darren Shepherd	dcc205f52d	mod tidy	2020-01-30 22:41:19 -07:00
Darren Shepherd	4e8035fa46	Fix go fmt/vet issues	2020-01-30 22:41:19 -07:00
Darren Shepherd	a75e84bc81	Add more helpers	2020-01-30 22:41:19 -07:00
Darren Shepherd	ab900b5268	Merge pull request #12 from ibuildthecloud/master Add static storage and listener opts	2019-12-04 11:35:09 -07:00
Darren Shepherd	f1484a07b3	Add static storage and listener opts	2019-12-04 11:32:00 -07:00