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Refactors common certificate behavior into a distinct package. Adds ability to go to/from Extension type <-> []pkix.Extensions. Signed-off-by: Billy Lynch <billy@chainguard.dev>
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| Original file line number | Diff line number | Diff line change |
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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. | ||
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| // Package certificate contains helpers for getting data from Fulcio issued | ||
| // x509 certificates. | ||
| package certificate |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,131 @@ | ||
| // 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. | ||
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| package certificate | ||
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| import ( | ||
| "crypto/x509/pkix" | ||
| "encoding/asn1" | ||
| "errors" | ||
| ) | ||
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| var ( | ||
| OIDIssuer = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 57264, 1, 1} | ||
| OIDGitHubWorkflowTrigger = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 57264, 1, 2} | ||
| OIDGitHubWorkflowSHA = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 57264, 1, 3} | ||
| OIDGitHubWorkflowName = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 57264, 1, 4} | ||
| OIDGitHubWorkflowRepository = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 57264, 1, 5} | ||
| OIDGitHubWorkflowRef = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 57264, 1, 6} | ||
| ) | ||
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| // Extensions contains all custom x509 extensions defined by Fulcio | ||
| type Extensions struct { | ||
| // NB: New extensions must be added here and documented | ||
| // at docs/oidc-info.md | ||
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| // The OIDC issuer. Should match `iss` claim of ID token or, in the case of | ||
| // a federated login like Dex it should match the issuer URL of the | ||
| // upstream issuer. The issuer is not set the extensions are invalid and | ||
| // will fail to render. | ||
| Issuer string // OID 1.3.6.1.4.1.57264.1.1 | ||
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| // Triggering event of the Github Workflow. Matches the `event_name` claim of ID | ||
| // tokens from Github Actions | ||
| GithubWorkflowTrigger string // OID 1.3.6.1.4.1.57264.1.2 | ||
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| // SHA of git commit being built in Github Actions. Matches the `sha` claim of ID | ||
| // tokens from Github Actions | ||
| GithubWorkflowSHA string // OID 1.3.6.1.4.1.57264.1.3 | ||
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| // Name of Github Actions Workflow. Matches the `workflow` claim of the ID | ||
| // tokens from Github Actions | ||
| GithubWorkflowName string // OID 1.3.6.1.4.1.57264.1.4 | ||
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| // Repository of the Github Actions Workflow. Matches the `repository` claim of the ID | ||
| // tokens from Github Actions | ||
| GithubWorkflowRepository string // OID 1.3.6.1.4.1.57264.1.5 | ||
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| // Git Ref of the Github Actions Workflow. Matches the `ref` claim of the ID tokens | ||
| // from Github Actions | ||
| GithubWorkflowRef string // 1.3.6.1.4.1.57264.1.6 | ||
| } | ||
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| func (e Extensions) Render() ([]pkix.Extension, error) { | ||
| var exts []pkix.Extension | ||
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| if e.Issuer != "" { | ||
| exts = append(exts, pkix.Extension{ | ||
| Id: OIDIssuer, | ||
| Value: []byte(e.Issuer), | ||
| }) | ||
| } else { | ||
| return nil, errors.New("extensions must have a non-empty issuer url") | ||
| } | ||
| if e.GithubWorkflowTrigger != "" { | ||
| exts = append(exts, pkix.Extension{ | ||
| Id: OIDGitHubWorkflowTrigger, | ||
| Value: []byte(e.GithubWorkflowTrigger), | ||
| }) | ||
| } | ||
| if e.GithubWorkflowSHA != "" { | ||
| exts = append(exts, pkix.Extension{ | ||
| Id: OIDGitHubWorkflowSHA, | ||
| Value: []byte(e.GithubWorkflowSHA), | ||
| }) | ||
| } | ||
| if e.GithubWorkflowName != "" { | ||
| exts = append(exts, pkix.Extension{ | ||
| Id: OIDGitHubWorkflowName, | ||
| Value: []byte(e.GithubWorkflowName), | ||
| }) | ||
| } | ||
| if e.GithubWorkflowRepository != "" { | ||
| exts = append(exts, pkix.Extension{ | ||
| Id: OIDGitHubWorkflowRepository, | ||
| Value: []byte(e.GithubWorkflowRepository), | ||
| }) | ||
| } | ||
| if e.GithubWorkflowRef != "" { | ||
| exts = append(exts, pkix.Extension{ | ||
| Id: OIDGitHubWorkflowRef, | ||
| Value: []byte(e.GithubWorkflowRef), | ||
| }) | ||
| } | ||
| return exts, nil | ||
| } | ||
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| func ParseExtensions(ext []pkix.Extension) (Extensions, error) { | ||
| out := Extensions{} | ||
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| for _, e := range ext { | ||
| switch { | ||
| case e.Id.Equal(OIDIssuer): | ||
| out.Issuer = string(e.Value) | ||
| case e.Id.Equal(OIDGitHubWorkflowTrigger): | ||
| out.GithubWorkflowTrigger = string(e.Value) | ||
| case e.Id.Equal(OIDGitHubWorkflowSHA): | ||
| out.GithubWorkflowSHA = string(e.Value) | ||
| case e.Id.Equal(OIDGitHubWorkflowName): | ||
| out.GithubWorkflowName = string(e.Value) | ||
| case e.Id.Equal(OIDGitHubWorkflowRepository): | ||
| out.GithubWorkflowRepository = string(e.Value) | ||
| case e.Id.Equal(OIDGitHubWorkflowRef): | ||
| out.GithubWorkflowRef = string(e.Value) | ||
| } | ||
| } | ||
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| // We only ever return nil, but leaving error in place so that we can add | ||
| // more complex parsing of fields in a backwards compatible way if needed. | ||
| return out, nil | ||
| } |
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