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Move github principal to its own package
Remove github workflow logic from challenge result and put it in its own package. Signed-off-by: Nathan Smith <nathan@chainguard.dev>
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Nathan Smith
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May 24, 2022
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| // 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 github | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/x509" | ||
| "errors" | ||
| "net/url" | ||
|
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| "github.com/coreos/go-oidc/v3/oidc" | ||
| "github.com/sigstore/fulcio/pkg/ca/x509ca" | ||
| "github.com/sigstore/fulcio/pkg/identity" | ||
| ) | ||
|
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| type workflowPrincipal struct { | ||
| // Subject matches the 'sub' claim from the OIDC ID token this is what is | ||
| // signed as proof of possession for Github workflow identities | ||
| subject string | ||
|
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| // OIDC Issuer URL. Matches 'iss' claim from ID token. The real issuer URL is | ||
| // https://token.actions.githubcontent.com/.well-known/openid-configution | ||
| issuer string | ||
|
|
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| // The full URL to the workflow. This will be the set as SubjectAlternativeName URI in | ||
| // the final certificate. | ||
| url string | ||
|
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| // Commit SHA being built | ||
| sha string | ||
|
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| // Event that triggered this workflow run. E.g "push", "tag" etc | ||
| trigger string | ||
|
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| // Repository building built | ||
| repository string | ||
|
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| // Workflow that is running | ||
| workflow string | ||
|
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| // Git ref being built | ||
| ref string | ||
| } | ||
|
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| func WorkflowPrincipalFromIDToken(ctx context.Context, token *oidc.IDToken) (identity.Principal, error) { | ||
| var claims struct { | ||
| JobWorkflowRef string `json:"job_workflow_ref"` | ||
| Sha string `json:"sha"` | ||
| Trigger string `json:"event_name"` | ||
| Repository string `json:"repository"` | ||
| Workflow string `json:"workflow"` | ||
| Ref string `json:"ref"` | ||
| } | ||
| if err := token.Claims(&claims); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if claims.JobWorkflowRef == "" { | ||
| return nil, errors.New("missing job_workflow_ref claim in ID token") | ||
| } | ||
| if claims.Sha == "" { | ||
| return nil, errors.New("missing sha claim in ID token") | ||
| } | ||
| if claims.Trigger == "" { | ||
| return nil, errors.New("missing event_name claim in ID token") | ||
| } | ||
| if claims.Repository == "" { | ||
| return nil, errors.New("missing repository claim in ID token") | ||
| } | ||
| if claims.Workflow == "" { | ||
| return nil, errors.New("missing workflow claim in ID token") | ||
| } | ||
| if claims.Ref == "" { | ||
| return nil, errors.New("missing ref claim in ID token") | ||
| } | ||
|
|
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| return &workflowPrincipal{ | ||
| subject: token.Subject, | ||
| issuer: token.Issuer, | ||
| url: `https://github.com/` + claims.JobWorkflowRef, | ||
| sha: claims.Sha, | ||
| trigger: claims.Trigger, | ||
| repository: claims.Repository, | ||
| workflow: claims.Workflow, | ||
| ref: claims.Ref, | ||
| }, nil | ||
| } | ||
|
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| func (w workflowPrincipal) Name(ctx context.Context) string { | ||
| return w.subject | ||
| } | ||
|
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| func (w workflowPrincipal) Embed(ctx context.Context, cert *x509.Certificate) error { | ||
| // Set workflow URL to SubjectAlternativeName on certificate | ||
| parsed, err := url.Parse(w.url) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| cert.URIs = []*url.URL{parsed} | ||
|
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| // Embed additional information into custom extensions | ||
| cert.ExtraExtensions, err = x509ca.Extensions{ | ||
| Issuer: w.issuer, | ||
| GithubWorkflowTrigger: w.trigger, | ||
| GithubWorkflowSHA: w.sha, | ||
| GithubWorkflowName: w.workflow, | ||
| GithubWorkflowRepository: w.repository, | ||
| GithubWorkflowRef: w.ref, | ||
| }.Render() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |
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