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Move kubernetes principal to package (#619)
Signed-off-by: Nathan Smith <nathan@chainguard.dev>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| // 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 kubernetes | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/x509" | ||
| "net/url" | ||
|
|
||
| "github.com/coreos/go-oidc/v3/oidc" | ||
| "github.com/sigstore/fulcio/pkg/ca/x509ca" | ||
| "github.com/sigstore/fulcio/pkg/identity" | ||
| ) | ||
|
|
||
| type principal struct { | ||
| // Subject ('sub') from ID token | ||
| subject string | ||
|
|
||
| // Issuer ('iss') from ID token | ||
| issuer string | ||
|
|
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| // URI to be set in certificate. URI is of the form | ||
| // https://kubernetes.io/namespaces/<namespace>/serviceaccounts/<serviceaccount>. | ||
| uri string | ||
| } | ||
|
|
||
| func PrincipalFromIDToken(ctx context.Context, token *oidc.IDToken) (identity.Principal, error) { | ||
| k8sURI, err := kubernetesToken(token) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return principal{ | ||
| subject: token.Subject, | ||
| issuer: token.Issuer, | ||
| uri: k8sURI, | ||
| }, nil | ||
| } | ||
|
|
||
| func (p principal) Name(context.Context) string { | ||
| return p.subject | ||
| } | ||
|
|
||
| func (p principal) Embed(ctx context.Context, cert *x509.Certificate) error { | ||
| parsed, err := url.Parse(p.uri) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| cert.URIs = []*url.URL{parsed} | ||
|
|
||
| cert.ExtraExtensions, err = x509ca.Extensions{ | ||
| Issuer: p.issuer, | ||
| }.Render() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func kubernetesToken(token *oidc.IDToken) (string, error) { | ||
| // Extract custom claims | ||
| var claims struct { | ||
| // "kubernetes.io": { | ||
| // "namespace": "default", | ||
| // "pod": { | ||
| // "name": "oidc-test", | ||
| // "uid": "49ad3572-b3dd-43a6-8d77-5858d3660275" | ||
| // }, | ||
| // "serviceaccount": { | ||
| // "name": "default", | ||
| // "uid": "f5720c1d-e152-4356-a897-11b07aff165d" | ||
| // } | ||
| // } | ||
| Kubernetes struct { | ||
| Namespace string `json:"namespace"` | ||
| Pod struct { | ||
| Name string `json:"name"` | ||
| UID string `json:"uid"` | ||
| } `json:"pod"` | ||
| ServiceAccount struct { | ||
| Name string `json:"name"` | ||
| UID string `json:"uid"` | ||
| } `json:"serviceaccount"` | ||
| } `json:"kubernetes.io"` | ||
| } | ||
| if err := token.Claims(&claims); err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| // We use this in URIs, so it has to be a URI. | ||
| return "https://kubernetes.io/namespaces/" + claims.Kubernetes.Namespace + "/serviceaccounts/" + claims.Kubernetes.ServiceAccount.Name, nil | ||
| } |
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