forked from square/keywhiz-fs
/
client.go
212 lines (184 loc) · 5.63 KB
/
client.go
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// Copyright 2015 Square Inc.
//
// 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 keywhizfs
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"log"
"net/http"
"time"
klog "github.com/square/keywhiz-fs/log"
)
// clientRefresh is the rate the client reloads itself in the background.
const clientRefresh = 10 * time.Minute
// Cipher suites enabled in the client. No RC4 or 3DES.
var ciphers = []uint16{
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
}
// Client basic struct.
type Client struct {
*klog.Logger
http func() *http.Client
url string
}
// httpClientParams are values necessary for constructing a TLS client.
type httpClientParams struct {
certFile,
keyFile,
caFile string
timeout time.Duration
}
// NewClient produces a read-to-use client struct given PEM-encoded certificate file, key file, and
// ca file with the list of trusted certificate authorities.
func NewClient(certFile, keyFile, caFile, serverURL string, timeout time.Duration, logConfig klog.Config, ping bool) (client Client) {
logger := klog.New("kwfs_client", logConfig)
params := httpClientParams{certFile, keyFile, caFile, timeout}
reqc := make(chan http.Client)
// Getter from channel.
getClient := func() *http.Client {
client := <-reqc
return &(client)
}
initial, err := params.buildClient()
if err != nil {
panic(err)
}
// Asynchronously updates client and owns current reference.
go func() {
var current = *initial
for {
select {
case t := <-time.Tick(clientRefresh): // Periodically update client.
logger.Infof("Updating http client at %v", t)
if c, err := params.buildClient(); err != nil {
logger.Errorf("Error refreshing http client: %v", err)
} else {
current = *c
}
case reqc <- current: // Service request for current client.
}
}
}()
client = Client{logger, getClient, serverURL}
if ping {
if _, ok := client.SecretList(); !ok {
log.Fatalf("Failed startup /secrets ping to %v", client.url)
}
}
return client
}
// RawSecret returns raw JSON from requesting a secret.
func (c Client) RawSecret(name string) (data []byte, ok bool) {
now := time.Now()
resp, err := c.http().Get(fmt.Sprintf("%v/secret/%v", c.url, name))
if err != nil {
c.Errorf("Error retrieving secret %v: %v", name, err)
return nil, false
}
c.Infof("GET /secret/%v %d %v", name, resp.StatusCode, time.Since(now))
defer resp.Body.Close()
data, err = ioutil.ReadAll(resp.Body)
if err != nil {
c.Errorf("Error reading response body for secret %v: %v", name, err)
return nil, false
}
switch resp.StatusCode {
case 200:
return data, true
case 404:
c.Warnf("Secret %v not found", name)
return nil, false
default:
c.Errorf("Bad response code getting secret %v: (status=%v, msg='%v')", name, resp.StatusCode, data)
return nil, false
}
}
// Secret returns an unmarshalled Secret struct after requesting a secret.
func (c Client) Secret(name string) (secret *Secret, ok bool) {
data, ok := c.RawSecret(name)
if !ok {
return nil, false
}
secret, err := ParseSecret(data)
if err != nil {
c.Errorf("Error decoding retrieved secret %v: %v", name, err)
return nil, false
}
return secret, true
}
// RawSecretList returns raw JSON from requesting a listing of secrets.
func (c Client) RawSecretList() (data []byte, ok bool) {
now := time.Now()
resp, err := c.http().Get(fmt.Sprintf("%v/secrets", c.url))
if err != nil {
c.Errorf("Error retrieving secrets: %v", err)
return nil, false
}
c.Infof("GET /secrets %d %v", resp.StatusCode, time.Since(now))
defer resp.Body.Close()
data, err = ioutil.ReadAll(resp.Body)
if err != nil {
c.Errorf("Error reading response body for secrets: %v", err)
return nil, false
}
if resp.StatusCode != 200 {
c.Errorf("Bad response code getting secrets: (status=%v, msg='%v')", resp.StatusCode, data)
return nil, false
}
return data, true
}
// SecretList returns a slice of unmarshalled Secret structs after requesting a listing of secrets.
func (c Client) SecretList() (secrets []Secret, ok bool) {
data, ok := c.RawSecretList()
if !ok {
return nil, false
}
secrets, err := ParseSecretList(data)
if err != nil {
c.Errorf("Error decoding retrieved secrets: %v", err)
return nil, false
}
return secrets, true
}
// buildClient constructs a new TLS client.
func (p httpClientParams) buildClient() (client *http.Client, err error) {
keyPair, err := tls.LoadX509KeyPair(p.certFile, p.keyFile)
if err != nil {
return
}
caCert, err := ioutil.ReadFile(p.caFile)
if err != nil {
return
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
config := &tls.Config{
Certificates: []tls.Certificate{keyPair},
RootCAs: caCertPool,
MinVersion: tls.VersionTLS12, // TLSv1.2 and up is required
CipherSuites: ciphers,
}
config.BuildNameToCertificate()
transport := &http.Transport{TLSClientConfig: config}
return &http.Client{Transport: transport, Timeout: p.timeout}, nil
}