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examples: This adds example code on how to fetch a fulcio certificate (…
…#324) * examples: This adds example code on how to fetch a fulcio certificate Signed-off-by: Morten Linderud <morten@linderud.pw> * examples: Added readme Signed-off-by: Morten Linderud <morten@linderud.pw> * examples/request-certificate: Updated authflow call Signed-off-by: Morten Linderud <morten@linderud.pw> * go.sum/mod: Updated dependencies Signed-off-by: Morten Linderud <morten@linderud.pw>
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| fulcio examples | ||
| =============== | ||
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| This directory contains example code that shows how one utilize the fulcio | ||
| library for certificate generation. | ||
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| # request-certificate | ||
| This code is a minimal example how one would request a short-lived certificate | ||
| (20 minutes) for code signing. It uses the fulcio oauth portal and generates a | ||
| RSA 4096 key. |
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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 main | ||
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| import ( | ||
| "bytes" | ||
| "crypto" | ||
| "crypto/x509" | ||
| "encoding/pem" | ||
| "fmt" | ||
| "log" | ||
| "net/url" | ||
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| "github.com/sigstore/fulcio/pkg/api" | ||
| "github.com/sigstore/sigstore/pkg/oauthflow" | ||
| "github.com/sigstore/sigstore/pkg/signature" | ||
| "github.com/sigstore/sigstore/pkg/signature/options" | ||
| ) | ||
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| var ( | ||
| fulcioUrl = "https://fulcio.sigstore.dev" | ||
| oidcIssuer = "https://oauth2.sigstore.dev/auth" | ||
| oidcClientID = "sigstore" | ||
| ) | ||
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| // Some of this is just ripped from cosign | ||
| func GetCert(signer *signature.RSAPKCS1v15SignerVerifier, fc api.Client, oidcIssuer string, oidcClientID string) (*api.CertificateResponse, error) { | ||
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| tok, err := oauthflow.OIDConnect(oidcIssuer, oidcClientID, "", "", oauthflow.DefaultIDTokenGetter) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| // Sign the email address as part of the request | ||
| b := bytes.NewBuffer([]byte(tok.Subject)) | ||
| proof, err := signer.SignMessage(b, options.WithCryptoSignerOpts(crypto.SHA256)) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
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| pubBytes, err := x509.MarshalPKIXPublicKey(signer.Public()) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| cr := api.CertificateRequest{ | ||
| PublicKey: api.Key{ | ||
| Algorithm: "rsa4096", | ||
| Content: pubBytes, | ||
| }, | ||
| SignedEmailAddress: proof, | ||
| } | ||
| return fc.SigningCert(cr, tok.RawString) | ||
| } | ||
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| func NewClient(fulcioURL string) (api.Client, error) { | ||
| fulcioServer, err := url.Parse(fulcioURL) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| fClient := api.NewClient(fulcioServer, api.WithUserAgent("Fulcio Example Code")) | ||
| return fClient, nil | ||
| } | ||
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| func main() { | ||
| signer, _, err := signature.NewDefaultRSAPKCS1v15SignerVerifier() | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
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| fClient, err := NewClient(fulcioUrl) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
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| certResp, err := GetCert(signer, fClient, oidcIssuer, oidcClientID) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
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| clientPEM, _ := pem.Decode([]byte(certResp.CertPEM)) | ||
| cert, err := x509.ParseCertificate(clientPEM.Bytes) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| fmt.Println("Received signing cerificate with serial number: ", cert.SerialNumber) | ||
| } |
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