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// Copyright 2022 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 uri
import (
"context"
"crypto/x509"
"errors"
"fmt"
"net/url"
"github.com/asaskevich/govalidator"
"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"
)
type principal struct {
issuer string
uri string
}
func PrincipalFromIDToken(ctx context.Context, token *oidc.IDToken) (identity.Principal, error) {
uriWithSubject := token.Subject
cfg, ok := config.FromContext(ctx).GetIssuer(token.Issuer)
if !ok {
return nil, errors.New("invalid configuration for OIDC ID Token issuer")
}
if govalidator.IsEmail(uriWithSubject) {
return nil, fmt.Errorf("uri subject should not be an email address")
}
// The subject hostname must exactly match the subject domain from the configuration
uSubject, err := url.Parse(uriWithSubject)
if err != nil {
return nil, err
}
uDomain, err := url.Parse(cfg.SubjectDomain)
if err != nil {
return nil, err
}
if uSubject.Scheme != uDomain.Scheme {
return nil, fmt.Errorf("subject URI scheme (%s) must match expected domain URI scheme (%s)", uSubject.Scheme, uDomain.Scheme)
}
if uSubject.Hostname() != uDomain.Hostname() {
return nil, fmt.Errorf("subject hostname (%s) must match expected domain (%s)", uSubject.Hostname(), uDomain.Hostname())
}
return principal{
issuer: token.Issuer,
uri: uriWithSubject,
}, nil
}
func (p principal) Name(_ context.Context) string {
return p.uri
}
func (p principal) Embed(_ context.Context, cert *x509.Certificate) error {
subjectURI, err := url.Parse(p.uri)
if err != nil {
return err
}
cert.URIs = []*url.URL{subjectURI}
cert.ExtraExtensions, err = certificate.Extensions{
Issuer: p.issuer,
}.Render()
if err != nil {
return err
}
return nil
}
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