mirror of https://github.com/grpc/grpc-go.git
108 lines
4.1 KiB
Go
108 lines
4.1 KiB
Go
/*
|
|
*
|
|
* Copyright 2025 gRPC authors.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
*/
|
|
|
|
// Package spiffe defines APIs for working with SPIFFE Bundle Maps.
|
|
//
|
|
// All APIs in this package are experimental.
|
|
package spiffe
|
|
|
|
import (
|
|
"crypto/x509"
|
|
"encoding/json"
|
|
"fmt"
|
|
|
|
"github.com/spiffe/go-spiffe/v2/bundle/spiffebundle"
|
|
"github.com/spiffe/go-spiffe/v2/spiffeid"
|
|
)
|
|
|
|
type partialParsedSPIFFEBundleMap struct {
|
|
Bundles map[string]json.RawMessage `json:"trust_domains"`
|
|
}
|
|
|
|
// BundleMapFromBytes parses bytes into a SPIFFE Bundle Map. See the
|
|
// SPIFFE Bundle Map spec for more detail -
|
|
// https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Trust_Domain_and_Bundle.md#4-spiffe-bundle-format
|
|
// If duplicate keys are encountered in the JSON parsing, Go's default unmarshal
|
|
// behavior occurs which causes the last processed entry to be the entry in the
|
|
// parsed map.
|
|
func BundleMapFromBytes(bundleMapBytes []byte) (map[string]*spiffebundle.Bundle, error) {
|
|
var result partialParsedSPIFFEBundleMap
|
|
if err := json.Unmarshal(bundleMapBytes, &result); err != nil {
|
|
return nil, err
|
|
}
|
|
if result.Bundles == nil {
|
|
return nil, fmt.Errorf("spiffe: BundleMapFromBytes() no bundles parsed from spiffe bundle map bytes")
|
|
}
|
|
bundleMap := map[string]*spiffebundle.Bundle{}
|
|
for td, jsonBundle := range result.Bundles {
|
|
trustDomain, err := spiffeid.TrustDomainFromString(td)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("spiffe: BundleMapFromBytes() invalid trust domain %q found when parsing SPIFFE Bundle Map: %v", td, err)
|
|
}
|
|
bundle, err := spiffebundle.Parse(trustDomain, jsonBundle)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("spiffe: BundleMapFromBytes() failed to parse bundle for trust domain %q: %v", td, err)
|
|
}
|
|
bundleMap[td] = bundle
|
|
}
|
|
return bundleMap, nil
|
|
}
|
|
|
|
// GetRootsFromSPIFFEBundleMap returns the root trust certificates from the
|
|
// SPIFFE bundle map for the given trust domain from the leaf certificate.
|
|
func GetRootsFromSPIFFEBundleMap(bundleMap map[string]*spiffebundle.Bundle, leafCert *x509.Certificate) (*x509.CertPool, error) {
|
|
// 1. Upon receiving a peer certificate, verify that it is a well-formed SPIFFE
|
|
// leaf certificate. In particular, it must have a single URI SAN containing
|
|
// a well-formed SPIFFE ID ([SPIFFE ID format]).
|
|
spiffeID, err := idFromCert(leafCert)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("spiffe: could not get spiffe ID from peer leaf cert but verification with spiffe trust map was configured: %v", err)
|
|
}
|
|
|
|
// 2. Use the trust domain in the peer certificate's SPIFFE ID to lookup
|
|
// the SPIFFE trust bundle. If the trust domain is not contained in the
|
|
// configured trust map, reject the certificate.
|
|
spiffeBundle, ok := bundleMap[spiffeID.TrustDomain().Name()]
|
|
if !ok {
|
|
return nil, fmt.Errorf("spiffe: no bundle found for peer certificates trust domain %q but verification with a SPIFFE trust map was configured", spiffeID.TrustDomain().Name())
|
|
}
|
|
roots := spiffeBundle.X509Authorities()
|
|
rootPool := x509.NewCertPool()
|
|
for _, root := range roots {
|
|
rootPool.AddCert(root)
|
|
}
|
|
return rootPool, nil
|
|
}
|
|
|
|
// idFromCert parses the SPIFFE ID from the x509.Certificate. If the certificate
|
|
// does not have a valid SPIFFE ID, returns an error.
|
|
func idFromCert(cert *x509.Certificate) (*spiffeid.ID, error) {
|
|
if cert == nil {
|
|
return nil, fmt.Errorf("input cert is nil")
|
|
}
|
|
// A valid SPIFFE Certificate should have exactly one URI.
|
|
if len(cert.URIs) != 1 {
|
|
return nil, fmt.Errorf("input cert has %v URIs but should have 1", len(cert.URIs))
|
|
}
|
|
id, err := spiffeid.FromURI(cert.URIs[0])
|
|
if err != nil {
|
|
return nil, fmt.Errorf("invalid spiffeid: %v", err)
|
|
}
|
|
return &id, nil
|
|
}
|