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client.go
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client.go
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//
// 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 api
import (
"bytes"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"path"
"time"
)
type CertificateResponse struct {
CertPEM []byte
ChainPEM []byte
SCT []byte
}
type RootResponse struct {
ChainPEM []byte
}
type Key struct {
// +required
Content []byte `json:"content"`
Algorithm string `json:"algorithm,omitempty"`
}
type CertificateRequest struct {
// +optional
PublicKey Key `json:"publicKey"`
// +optional
SignedEmailAddress []byte `json:"signedEmailAddress"`
// +optional
CertificateSigningRequest []byte `json:"certificateSigningRequest"`
}
const (
signingCertPath = "/api/v1/signingCert"
rootCertPath = "/api/v1/rootCert"
)
// SigstorePublicServerURL is the URL of Sigstore's public Fulcio service.
const SigstorePublicServerURL = "https://fulcio.sigstore.dev"
// LegacyClient is the interface for accessing the Fulcio API.
type LegacyClient interface {
// SigningCert sends the provided CertificateRequest to the /api/v1/signingCert
// endpoint of a Fulcio API, authenticated with the provided bearer token.
SigningCert(cr CertificateRequest, token string) (*CertificateResponse, error)
// RootCert sends a request to get the current CA used by Fulcio.
RootCert() (*RootResponse, error)
}
// ClientOption is a functional option for customizing static signatures.
type ClientOption func(*clientOptions)
// NewClient creates a new Fulcio API client talking to the provided URL.
func NewClient(url *url.URL, opts ...ClientOption) LegacyClient {
o := makeOptions(opts...)
return &client{
baseURL: url,
client: &http.Client{
Transport: createRoundTripper(http.DefaultTransport, o),
Timeout: o.Timeout,
},
}
}
type client struct {
baseURL *url.URL
client *http.Client
}
var _ LegacyClient = (*client)(nil)
// SigningCert implements Client
func (c *client) SigningCert(cr CertificateRequest, token string) (*CertificateResponse, error) {
// Construct the API endpoint for this handler
endpoint := *c.baseURL
endpoint.Path = path.Join(endpoint.Path, signingCertPath)
b, err := json.Marshal(cr)
if err != nil {
return nil, fmt.Errorf("marshal: %w", err)
}
req, err := http.NewRequest(http.MethodPost, endpoint.String(), bytes.NewBuffer(b))
if err != nil {
return nil, fmt.Errorf("request: %w", err)
}
// Set the authorization header to our OIDC bearer token.
req.Header.Set("Authorization", "Bearer "+token)
// Set the content-type to reflect we're sending JSON.
req.Header.Set("Content-Type", "application/json")
resp, err := c.client.Do(req)
if err != nil {
return nil, fmt.Errorf("client: %w", err)
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("%s read: %w", endpoint.String(), err)
}
// The API should return a 201 Created on success. If we see anything else,
// then turn the response body into an error.
if resp.StatusCode != http.StatusCreated {
return nil, fmt.Errorf("%s %s returned %s: %q", http.MethodPost, endpoint.String(), resp.Status, body)
}
// Extract the SCT from the response header.
sct, err := base64.StdEncoding.DecodeString(resp.Header.Get("SCT"))
if err != nil {
return nil, fmt.Errorf("decode: %w", err)
}
// Split the cert and the chain
certBlock, chainPem := pem.Decode(body)
if certBlock == nil {
return nil, errors.New("did not find a cert from Fulcio")
}
certPem := pem.EncodeToMemory(certBlock)
return &CertificateResponse{
CertPEM: certPem,
ChainPEM: chainPem,
SCT: sct,
}, nil
}
func (c *client) RootCert() (*RootResponse, error) {
// Construct the API endpoint for this handler
endpoint := *c.baseURL
endpoint.Path = path.Join(endpoint.Path, rootCertPath)
req, err := http.NewRequest(http.MethodGet, endpoint.String(), nil)
if err != nil {
return nil, fmt.Errorf("request: %w", err)
}
resp, err := c.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return nil, errors.New(string(body))
}
return &RootResponse{ChainPEM: body}, nil
}
type clientOptions struct {
UserAgent string
Timeout time.Duration
}
func makeOptions(opts ...ClientOption) *clientOptions {
o := &clientOptions{
UserAgent: "",
}
for _, opt := range opts {
opt(o)
}
return o
}
// WithTimeout sets the request timeout for the client
func WithTimeout(timeout time.Duration) ClientOption {
return func(o *clientOptions) {
o.Timeout = timeout
}
}
// WithUserAgent sets the media type of the signature.
func WithUserAgent(userAgent string) ClientOption {
return func(o *clientOptions) {
o.UserAgent = userAgent
}
}
type roundTripper struct {
http.RoundTripper
UserAgent string
}
// RoundTrip implements `http.RoundTripper`
func (rt *roundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
req.Header.Set("User-Agent", rt.UserAgent)
return rt.RoundTripper.RoundTrip(req)
}
func createRoundTripper(inner http.RoundTripper, o *clientOptions) http.RoundTripper {
if inner == nil {
inner = http.DefaultTransport
}
if o.UserAgent == "" {
// There's nothing to do...
return inner
}
return &roundTripper{
RoundTripper: inner,
UserAgent: o.UserAgent,
}
}