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Signed-off-by: Nathan Smith <nathan@chainguard.dev>
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Nathan Smith
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May 23, 2022
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // 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/ca/x509ca" | ||
| "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 | ||
| } | ||
|
|
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| 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 | ||
| } | ||
|
|
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| // Now issue cert! | ||
| return principal{ | ||
| id: token.Subject, | ||
| issuer: token.Issuer, | ||
| }, nil | ||
|
|
||
| } | ||
|
|
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| 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) | ||
| } | ||
|
|
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| parsedID, err := spiffeid.FromString(id) | ||
| if err != nil { | ||
| return fmt.Errorf("invalid spiffe ID provided: %s", id) | ||
| } | ||
|
|
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| if parsedID.TrustDomain().Compare(parsedTrustDomain) != 0 { | ||
| return fmt.Errorf("spiffe ID trust domain %s doesn't match configured trust domain %s", parsedID.TrustDomain(), trustDomain) | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
|
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| func (p principal) Name(context.Context) string { | ||
| return p.id | ||
| } | ||
|
|
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| func (p principal) Embed(ctx context.Context, cert *x509.Certificate) error { | ||
| parsed, err := url.Parse(p.id) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| cert.URIs = []*url.URL{parsed} | ||
|
|
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| cert.ExtraExtensions, err = x509ca.Extensions{ | ||
| Issuer: p.issuer, | ||
| }.Render() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |
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