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// Copyright 2021 The Sigstore 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
import (
"context"
"crypto/x509"
"errors"
"fmt"
"net/url"
"github.com/coreos/go-oidc/v3/oidc"
"github.com/sigstore/fulcio/pkg/certificate"
"github.com/sigstore/fulcio/pkg/config"
"github.com/sigstore/fulcio/pkg/identity"
"github.com/spiffe/go-spiffe/v2/spiffeid"
)
type principal struct {
// spiffe ID
id string
// OIDC issuer url
issuer string
}
func PrincipalFromIDToken(ctx context.Context, token *oidc.IDToken) (identity.Principal, error) {
cfg, ok := config.FromContext(ctx).GetIssuer(token.Issuer)
if !ok {
return nil, errors.New("invalid configuration for OIDC ID Token issuer")
}
if err := validSpiffeID(token.Subject, cfg.SPIFFETrustDomain); err != nil {
return nil, err
}
return principal{
id: token.Subject,
issuer: token.Issuer,
}, nil
}
func validSpiffeID(id, trustDomain string) error {
parsedTrustDomain, err := spiffeid.TrustDomainFromString(trustDomain)
if err != nil {
return fmt.Errorf("unable to parse trust domain from configuration %s: %w", trustDomain, err)
}
parsedID, err := spiffeid.FromString(id)
if err != nil {
return fmt.Errorf("invalid spiffe ID provided: %s", id)
}
if parsedID.TrustDomain().Compare(parsedTrustDomain) != 0 {
return fmt.Errorf("spiffe ID trust domain %s doesn't match configured trust domain %s", parsedID.TrustDomain(), trustDomain)
}
return nil
}
func (p principal) Name(_ context.Context) string {
return p.id
}
func (p principal) Embed(_ context.Context, cert *x509.Certificate) error {
parsed, err := url.Parse(p.id)
if err != nil {
return err
}
cert.URIs = []*url.URL{parsed}
cert.ExtraExtensions, err = certificate.Extensions{
Issuer: p.issuer,
}.Render()
if err != nil {
return err
}
return nil
}
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