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azuredb.go
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azuredb.go
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// Copyright 2019 The Go Cloud Development Kit 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
//
// https://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 azuredb contains Wire providers that are common across Azure Database.
package azuredb
import (
"context"
"crypto/x509"
"encoding/pem"
"fmt"
"io"
"io/ioutil"
"net/http"
"golang.org/x/net/context/ctxhttp"
)
const caBundleURL = "https://www.digicert.com/CACerts/BaltimoreCyberTrustRoot.crt.pem"
// A CertPoolProvider returns a certificate pool that contains the Azure CA certificate.
type CertPoolProvider interface {
AzureCertPool(context.Context) (*x509.CertPool, error)
}
// CertFetcher pulls the Azure CA certificates from Digicert's servers. The zero
// value will fetch certificates using the default HTTP client.
type CertFetcher struct {
// Client is the HTTP client used to make requests. If nil, then
// http.DefaultClient is used.
Client *http.Client
}
// AzureCertPool fetches the Azure CA certificates and places them into a pool.
// It is safe to call from multiple goroutines.
func (cf *CertFetcher) AzureCertPool(ctx context.Context) (*x509.CertPool, error) {
certs, err := cf.Fetch(ctx)
if err != nil {
return nil, err
}
certPool := x509.NewCertPool()
for _, c := range certs {
certPool.AddCert(c)
}
return certPool, nil
}
// Fetch fetches the Azure CA certificates. It is safe to call from multiple goroutines.
func (cf *CertFetcher) Fetch(ctx context.Context) ([]*x509.Certificate, error) {
client := cf.Client
if client == nil {
client = http.DefaultClient
}
resp, err := ctxhttp.Get(ctx, client, caBundleURL)
if err != nil {
return nil, fmt.Errorf("fetch Azure certificates: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("fetch Azure certificates: HTTP %s", resp.Status)
}
pemData, err := ioutil.ReadAll(&io.LimitedReader{R: resp.Body, N: 1 << 20}) // limit to 1MiB
if err != nil {
return nil, fmt.Errorf("fetch Azure certificates: %v", err)
}
var certs []*x509.Certificate
for len(pemData) > 0 {
var block *pem.Block
block, pemData = pem.Decode(pemData)
if block == nil {
break
}
if block.Type != "CERTIFICATE" || len(block.Headers) != 0 {
continue
}
c, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, fmt.Errorf("fetch Azure certificates: %v", err)
}
certs = append(certs, c)
}
return certs, nil
}