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ipn/ipnlocal: also store ACME keys in the certStore

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We were not storing the ACME keys in the state store, they would always
be stored on disk.

Updates #7588

Signed-off-by: Maisem Ali <maisem@tailscale.com>
pull/7674/head
Maisem Ali 2 years ago committed by Maisem Ali
parent 0e203e414f
commit ec90522a53
1 changed files with 62 additions and 26 deletions
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88
ipn/ipnlocal/cert.go
Unescape Escape View File

@ -82,11 +82,6 @@ func (b *LocalBackend) GetCertPEM(ctx context.Context, domain string) (*TLSCertK
return nil, errors.New("invalid domain")
}
logf := logger.WithPrefix(b.logf, fmt.Sprintf("cert(%q): ", domain))
dir, err := b.certDir()
if err != nil {
logf("failed to get certDir: %v", err)
return nil, err
}
now := time.Now()
traceACME := func(v any) {
if !acmeDebug() {
@ -96,17 +91,22 @@ func (b *LocalBackend) GetCertPEM(ctx context.Context, domain string) (*TLSCertK
log.Printf("acme %T: %s", v, j)
}
if pair, err := b.getCertPEMCached(dir, domain, now); err == nil {
cs, err := b.getCertStore()
if err != nil {
return nil, err
}
if pair, err := getCertPEMCached(cs, domain, now); err == nil {
future := now.AddDate(0, 0, 14)
if b.shouldStartDomainRenewal(dir, domain, future) {
if b.shouldStartDomainRenewal(cs, domain, future) {
logf("starting async renewal")
// Start renewal in the background.
go b.getCertPEM(context.Background(), logf, traceACME, dir, domain, future)
go b.getCertPEM(context.Background(), cs, logf, traceACME, domain, future)
}
return pair, nil
}
pair, err := b.getCertPEM(ctx, logf, traceACME, dir, domain, now)
pair, err := b.getCertPEM(ctx, cs, logf, traceACME, domain, now)
if err != nil {
logf("getCertPEM: %v", err)
return nil, err
@ -114,7 +114,7 @@ func (b *LocalBackend) GetCertPEM(ctx context.Context, domain string) (*TLSCertK
return pair, nil
}
func (b *LocalBackend) shouldStartDomainRenewal(dir, domain string, future time.Time) bool {
func (b *LocalBackend) shouldStartDomainRenewal(cs certStore, domain string, future time.Time) bool {
renewMu.Lock()
defer renewMu.Unlock()
now := time.Now()
@ -124,7 +124,7 @@ func (b *LocalBackend) shouldStartDomainRenewal(dir, domain string, future time.
return false
}
lastRenewCheck[domain] = now
_, err := b.getCertPEMCached(dir, domain, future)
_, err := getCertPEMCached(cs, domain, future)
return errors.Is(err, errCertExpired)
}
@ -140,15 +140,24 @@ type certStore interface {
WriteCert(domain string, cert []byte) error
// WriteKey writes the key for domain.
WriteKey(domain string, key []byte) error
// ACMEKey returns the value previously stored via WriteACMEKey.
// It is a PEM encoded ECDSA key.
ACMEKey() ([]byte, error)
// WriteACMEKey stores the provided PEM encoded ECDSA key.
WriteACMEKey([]byte) error
}
var errCertExpired = errors.New("cert expired")
func (b *LocalBackend) getCertStore(dir string) certStore {
func (b *LocalBackend) getCertStore() (certStore, error) {
dir, err := b.certDir()
if err != nil {
return nil, err
}
if hostinfo.GetEnvType() == hostinfo.Kubernetes && dir == "/tmp" {
return certStateStore{StateStore: b.store}
return certStateStore{StateStore: b.store}, nil
}
return certFileStore{dir: dir}
return certFileStore{dir: dir}, nil
}
// certFileStore implements certStore by storing the cert & key files in the named directory.
@ -160,6 +169,25 @@ type certFileStore struct {
testRoots *x509.CertPool
}
const acmePEMName = "acme-account.key.pem"
func (f certFileStore) ACMEKey() ([]byte, error) {
pemName := filepath.Join(f.dir, acmePEMName)
v, err := os.ReadFile(pemName)
if err != nil {
if os.IsNotExist(err) {
return nil, ipn.ErrStateNotExist
}
return nil, err
}
return v, nil
}
func (f certFileStore) WriteACMEKey(b []byte) error {
pemName := filepath.Join(f.dir, acmePEMName)
return os.WriteFile(pemName, b, 0600)
}
func (f certFileStore) Read(domain string, now time.Time) (*TLSCertKeyPair, error) {
certPEM, err := os.ReadFile(certFile(f.dir, domain))
if err != nil {
@ -221,6 +249,14 @@ func (s certStateStore) WriteKey(domain string, key []byte) error {
return s.WriteState(ipn.StateKey(domain+".key"), key)
}
func (s certStateStore) ACMEKey() ([]byte, error) {
return s.ReadState(ipn.StateKey(acmePEMName))
}
func (s certStateStore) WriteACMEKey(key []byte) error {
return s.WriteState(ipn.StateKey(acmePEMName), key)
}
// TLSCertKeyPair is a TLS public and private key, and whether they were obtained
// from cache or freshly obtained.
type TLSCertKeyPair struct {
@ -236,26 +272,26 @@ func certFile(dir, domain string) string { return filepath.Join(dir, domain+".cr
// domain exists on disk in dir that is valid at the provided now time.
// If the keypair is expired, it returns errCertExpired.
// If the keypair doesn't exist, it returns ipn.ErrStateNotExist.
func (b *LocalBackend) getCertPEMCached(dir, domain string, now time.Time) (p *TLSCertKeyPair, err error) {
func getCertPEMCached(cs certStore, domain string, now time.Time) (p *TLSCertKeyPair, err error) {
if !validLookingCertDomain(domain) {
// Before we read files from disk using it, validate it's halfway
// reasonable looking.
return nil, fmt.Errorf("invalid domain %q", domain)
}
return b.getCertStore(dir).Read(domain, now)
return cs.Read(domain, now)
}
func (b *LocalBackend) getCertPEM(ctx context.Context, logf logger.Logf, traceACME func(any), dir, domain string, now time.Time) (*TLSCertKeyPair, error) {
func (b *LocalBackend) getCertPEM(ctx context.Context, cs certStore, logf logger.Logf, traceACME func(any), domain string, now time.Time) (*TLSCertKeyPair, error) {
acmeMu.Lock()
defer acmeMu.Unlock()
if p, err := b.getCertPEMCached(dir, domain, now); err == nil {
if p, err := getCertPEMCached(cs, domain, now); err == nil {
return p, nil
} else if !errors.Is(err, ipn.ErrStateNotExist) && !errors.Is(err, errCertExpired) {
return nil, err
}
key, err := acmeKey(dir)
key, err := acmeKey(cs)
if err != nil {
return nil, fmt.Errorf("acmeKey: %w", err)
}
@ -366,8 +402,7 @@ func (b *LocalBackend) getCertPEM(ctx context.Context, logf logger.Logf, traceAC
if err := encodeECDSAKey(&privPEM, certPrivKey); err != nil {
return nil, err
}
certStore := b.getCertStore(dir)
if err := certStore.WriteKey(domain, privPEM.Bytes()); err != nil {
if err := cs.WriteKey(domain, privPEM.Bytes()); err != nil {
return nil, err
}
@ -390,7 +425,7 @@ func (b *LocalBackend) getCertPEM(ctx context.Context, logf logger.Logf, traceAC
return nil, err
}
}
if err := certStore.WriteCert(domain, certPEM.Bytes()); err != nil {
if err := cs.WriteCert(domain, certPEM.Bytes()); err != nil {
return nil, err
}
@ -444,14 +479,15 @@ func parsePrivateKey(der []byte) (crypto.Signer, error) {
return nil, errors.New("acme/autocert: failed to parse private key")
}
func acmeKey(dir string) (crypto.Signer, error) {
pemName := filepath.Join(dir, "acme-account.key.pem")
if v, err := os.ReadFile(pemName); err == nil {
func acmeKey(cs certStore) (crypto.Signer, error) {
if v, err := cs.ACMEKey(); err == nil {
priv, _ := pem.Decode(v)
if priv == nil || !strings.Contains(priv.Type, "PRIVATE") {
return nil, errors.New("acme/autocert: invalid account key found in cache")
}
return parsePrivateKey(priv.Bytes)
} else if err != nil && !errors.Is(err, ipn.ErrStateNotExist) {
return nil, err
}
privKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
@ -462,7 +498,7 @@ func acmeKey(dir string) (crypto.Signer, error) {
if err := encodeECDSAKey(&pemBuf, privKey); err != nil {
return nil, err
}
if err := os.WriteFile(pemName, pemBuf.Bytes(), 0600); err != nil {
if err := cs.WriteACMEKey(pemBuf.Bytes()); err != nil {
return nil, err
}
return privKey, nil

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