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bundle.go
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bundle.go
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package bundleutil
import (
"crypto"
"crypto/x509"
"errors"
"fmt"
"time"
"github.com/sirupsen/logrus"
"github.com/spiffe/go-spiffe/v2/bundle/spiffebundle"
"github.com/spiffe/go-spiffe/v2/spiffeid"
"github.com/spiffe/spire-api-sdk/proto/spire/api/types"
"github.com/spiffe/spire/pkg/common/telemetry"
"github.com/spiffe/spire/proto/spire/common"
"google.golang.org/protobuf/proto"
)
func CommonBundleFromProto(b *types.Bundle) (*common.Bundle, error) {
if b == nil {
return nil, errors.New("no bundle provided")
}
td, err := spiffeid.TrustDomainFromString(b.TrustDomain)
if err != nil {
return nil, fmt.Errorf("bundle has an invalid trust domain %q: %w", b.TrustDomain, err)
}
var rootCAs []*common.Certificate
for _, rootCA := range b.X509Authorities {
rootCAs = append(rootCAs, &common.Certificate{
DerBytes: rootCA.Asn1,
})
}
var jwtKeys []*common.PublicKey
for _, key := range b.JwtAuthorities {
if key.KeyId == "" {
return nil, errors.New("missing key ID")
}
jwtKeys = append(jwtKeys, &common.PublicKey{
PkixBytes: key.PublicKey,
Kid: key.KeyId,
NotAfter: key.ExpiresAt,
})
}
return &common.Bundle{
TrustDomainId: td.IDString(),
RefreshHint: b.RefreshHint,
SequenceNumber: b.SequenceNumber,
RootCas: rootCAs,
JwtSigningKeys: jwtKeys,
}, nil
}
func SPIFFEBundleToProto(b *spiffebundle.Bundle) (*common.Bundle, error) {
refreshHint, _ := b.RefreshHint()
s, _ := b.SequenceNumber()
bundle := &common.Bundle{
TrustDomainId: b.TrustDomain().IDString(),
RefreshHint: int64(refreshHint.Seconds()),
SequenceNumber: s,
}
for _, rootCA := range b.X509Authorities() {
bundle.RootCas = append(bundle.RootCas, &common.Certificate{
DerBytes: rootCA.Raw,
})
}
for kid, key := range b.JWTAuthorities() {
pkixBytes, err := x509.MarshalPKIXPublicKey(key)
if err != nil {
return nil, fmt.Errorf("failed to marshal public key: %w", err)
}
bundle.JwtSigningKeys = append(bundle.JwtSigningKeys, &common.PublicKey{
PkixBytes: pkixBytes,
Kid: kid,
})
}
return bundle, nil
}
func SPIFFEBundleFromProto(b *common.Bundle) (*spiffebundle.Bundle, error) {
rootCAs, err := RootCAsFromBundleProto(b)
if err != nil {
return nil, err
}
jwtSigningKeys, err := JWTSigningKeysFromBundleProto(b)
if err != nil {
return nil, err
}
td, err := spiffeid.TrustDomainFromString(b.TrustDomainId)
if err != nil {
return nil, err
}
bundle := spiffebundle.New(td)
bundle.SetX509Authorities(rootCAs)
bundle.SetJWTAuthorities(jwtSigningKeys)
bundle.SetRefreshHint(time.Second * time.Duration(b.RefreshHint))
bundle.SetSequenceNumber(b.SequenceNumber)
return bundle, nil
}
func BundleProtoFromRootCA(trustDomainID string, rootCA *x509.Certificate) *common.Bundle {
return BundleProtoFromRootCAs(trustDomainID, []*x509.Certificate{rootCA})
}
func BundleProtoFromRootCAs(trustDomainID string, rootCAs []*x509.Certificate) *common.Bundle {
b := &common.Bundle{
TrustDomainId: trustDomainID,
}
for _, rootCA := range rootCAs {
b.RootCas = append(b.RootCas, &common.Certificate{
DerBytes: rootCA.Raw,
})
}
return b
}
func RootCAsFromBundleProto(b *common.Bundle) (out []*x509.Certificate, err error) {
for i, rootCA := range b.RootCas {
cert, err := x509.ParseCertificate(rootCA.DerBytes)
if err != nil {
return nil, fmt.Errorf("unable to parse root CA %d: %w", i, err)
}
out = append(out, cert)
}
return out, nil
}
func JWTSigningKeysFromBundleProto(b *common.Bundle) (map[string]crypto.PublicKey, error) {
out := make(map[string]crypto.PublicKey)
for i, publicKey := range b.JwtSigningKeys {
jwtSigningKey, err := x509.ParsePKIXPublicKey(publicKey.PkixBytes)
if err != nil {
return nil, fmt.Errorf("unable to parse JWT signing key %d: %w", i, err)
}
out[publicKey.Kid] = jwtSigningKey
}
return out, nil
}
func MergeBundles(a, b *common.Bundle) (*common.Bundle, bool) {
c := cloneBundle(a)
rootCAs := make(map[string]bool)
for _, rootCA := range a.RootCas {
rootCAs[rootCA.String()] = true
}
jwtSigningKeys := make(map[string]bool)
for _, jwtSigningKey := range a.JwtSigningKeys {
jwtSigningKeys[jwtSigningKey.String()] = true
}
var changed bool
for _, rootCA := range b.RootCas {
if !rootCAs[rootCA.String()] {
c.RootCas = append(c.RootCas, rootCA)
changed = true
}
}
for _, jwtSigningKey := range b.JwtSigningKeys {
if !jwtSigningKeys[jwtSigningKey.String()] {
c.JwtSigningKeys = append(c.JwtSigningKeys, jwtSigningKey)
changed = true
}
}
return c, changed
}
// PruneBundle removes the bundle RootCAs and JWT keys that expired before a given time
// It returns an error if prunning results in a bundle with no CAs or keys
func PruneBundle(bundle *common.Bundle, expiration time.Time, log logrus.FieldLogger) (*common.Bundle, bool, error) {
if bundle == nil {
return nil, false, errors.New("current bundle is nil")
}
// Zero value is a valid time, but probably unintended
if expiration.IsZero() {
return nil, false, errors.New("expiration time is zero value")
}
// Creates new bundle with non expired certs only
newBundle := &common.Bundle{
TrustDomainId: bundle.TrustDomainId,
}
changed := false
pruneRootCA:
for _, rootCA := range bundle.RootCas {
certs, err := x509.ParseCertificates(rootCA.DerBytes)
if err != nil {
return nil, false, fmt.Errorf("cannot parse certificates: %w", err)
}
// if any cert in the chain has expired, throw the whole chain out
for _, cert := range certs {
if !cert.NotAfter.After(expiration) {
log.WithFields(logrus.Fields{
telemetry.SerialNumber: cert.SerialNumber,
telemetry.Expiration: cert.NotAfter,
}).Info("Pruning CA certificate due to expiration")
changed = true
continue pruneRootCA
}
}
newBundle.RootCas = append(newBundle.RootCas, rootCA)
}
for _, jwtSigningKey := range bundle.JwtSigningKeys {
notAfter := time.Unix(jwtSigningKey.NotAfter, 0)
if !notAfter.After(expiration) {
log.WithFields(logrus.Fields{
telemetry.Kid: jwtSigningKey.Kid,
telemetry.Expiration: notAfter,
}).Info("Pruning JWT signing key due to expiration")
changed = true
continue
}
newBundle.JwtSigningKeys = append(newBundle.JwtSigningKeys, jwtSigningKey)
}
if len(newBundle.RootCas) == 0 {
log.Warn("Pruning halted; all known CA certificates have expired")
return nil, false, errors.New("would prune all certificates")
}
if len(newBundle.JwtSigningKeys) == 0 {
log.Warn("Pruning halted; all known JWT signing keys have expired")
return nil, false, errors.New("would prune all JWT signing keys")
}
return newBundle, changed, nil
}
func cloneBundle(b *common.Bundle) *common.Bundle {
return proto.Clone(b).(*common.Bundle)
}