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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 username
import (
"context"
"crypto/x509"
"crypto/x509/pkix"
"errors"
"fmt"
"strings"
"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"
"github.com/sigstore/sigstore/pkg/cryptoutils"
)
type principal struct {
issuer string
username string
unIdentity string
}
func PrincipalFromIDToken(ctx context.Context, token *oidc.IDToken) (identity.Principal, error) {
username := token.Subject
if strings.Contains(username, "!") {
return nil, errors.New("username cannot contain ! character")
}
if govalidator.IsEmail(username) {
return nil, fmt.Errorf("uri subject should not be an email address")
}
cfg, ok := config.FromContext(ctx).GetIssuer(token.Issuer)
if !ok {
return nil, errors.New("invalid configuration for OIDC ID Token issuer")
}
unIdentity := fmt.Sprintf("%s!%s", username, cfg.SubjectDomain)
return principal{
issuer: token.Issuer,
username: username,
unIdentity: unIdentity,
}, nil
}
func (p principal) Name(context.Context) string {
return p.username
}
func (p principal) Embed(_ context.Context, cert *x509.Certificate) error {
var exts []pkix.Extension
ext, err := cryptoutils.MarshalOtherNameSAN(p.unIdentity, true /*critical*/)
if err != nil {
return err
}
exts = append(exts, *ext)
issuerExt, err := certificate.Extensions{
Issuer: p.issuer,
}.Render()
if err != nil {
return err
}
exts = append(exts, issuerExt...)
cert.ExtraExtensions = exts
return nil
}
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