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// Copyright 2023 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 buildkite
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/identity"
)
type jobPrincipal struct {
// Subject matches the 'sub' claim from the OIDC ID token this is what is
// signed as proof of possession for Buildkite job identities
subject string
// OIDC Issuer URL. Matches 'iss' claim from ID token. The real issuer URL is
// https://agent.buildkite.com/.well-known/openid-configuration
issuer string
// The URL of the pipeline, the container of many builds. This will be
// set as a human-friendly SubjectAlternativeName URI in the certificate.
url string
}
func JobPrincipalFromIDToken(_ context.Context, token *oidc.IDToken) (identity.Principal, error) {
var claims struct {
OrganizationSlug string `json:"organization_slug"`
PipelineSlug string `json:"pipeline_slug"`
}
if err := token.Claims(&claims); err != nil {
return nil, err
}
if claims.OrganizationSlug == "" {
return nil, errors.New("missing organization_slug claim in ID token")
}
if claims.PipelineSlug == "" {
return nil, errors.New("missing pipeline_slug claim in ID token")
}
return &jobPrincipal{
subject: token.Subject,
issuer: token.Issuer,
url: fmt.Sprintf("https://buildkite.com/%s/%s", claims.OrganizationSlug, claims.PipelineSlug),
}, nil
}
func (p jobPrincipal) Name(_ context.Context) string {
return p.subject
}
func (p jobPrincipal) Embed(_ context.Context, cert *x509.Certificate) error {
// Set SubjectAlternativeName to the pipeline URL on the certificate
parsed, err := url.Parse(p.url)
if err != nil {
return err
}
cert.URIs = []*url.URL{parsed}
// Embed additional information into custom extensions
cert.ExtraExtensions, err = certificate.Extensions{
Issuer: p.issuer,
}.Render()
if err != nil {
return err
}
return nil
}
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