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api.go
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api.go
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// Copyright 2017 clair 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 (
"crypto/tls"
"crypto/x509"
"io/ioutil"
"net"
"net/http"
"strconv"
"time"
"github.com/coreos/pkg/capnslog"
"github.com/tylerb/graceful"
"github.com/coreos/clair/database"
"github.com/coreos/clair/pkg/stopper"
)
const timeoutResponse = `{"Error":{"Message":"Clair failed to respond within the configured timeout window.","Type":"Timeout"}}`
var log = capnslog.NewPackageLogger("github.com/coreos/clair", "api")
// Config is the configuration for the API service.
type Config struct {
Port int
HealthPort int
Timeout time.Duration
PaginationKey string
CertFile, KeyFile, CAFile string
}
func Run(cfg *Config, store database.Datastore, st *stopper.Stopper) {
defer st.End()
// Do not run the API service if there is no config.
if cfg == nil {
log.Infof("main API service is disabled.")
return
}
log.Infof("starting main API on port %d.", cfg.Port)
tlsConfig, err := tlsClientConfig(cfg.CAFile)
if err != nil {
log.Fatalf("could not initialize client cert authentication: %s\n", err)
}
if tlsConfig != nil {
log.Info("main API configured with client certificate authentication")
}
srv := &graceful.Server{
Timeout: 0, // Already handled by our TimeOut middleware
NoSignalHandling: true, // We want to use our own Stopper
Server: &http.Server{
Addr: ":" + strconv.Itoa(cfg.Port),
TLSConfig: tlsConfig,
Handler: http.TimeoutHandler(newAPIHandler(cfg, store), cfg.Timeout, timeoutResponse),
},
}
listenAndServeWithStopper(srv, st, cfg.CertFile, cfg.KeyFile)
log.Info("main API stopped")
}
func RunHealth(cfg *Config, store database.Datastore, st *stopper.Stopper) {
defer st.End()
// Do not run the API service if there is no config.
if cfg == nil {
log.Infof("health API service is disabled.")
return
}
log.Infof("starting health API on port %d.", cfg.HealthPort)
srv := &graceful.Server{
Timeout: 10 * time.Second, // Interrupt health checks when stopping
NoSignalHandling: true, // We want to use our own Stopper
Server: &http.Server{
Addr: ":" + strconv.Itoa(cfg.HealthPort),
Handler: http.TimeoutHandler(newHealthHandler(store), cfg.Timeout, timeoutResponse),
},
}
listenAndServeWithStopper(srv, st, "", "")
log.Info("health API stopped")
}
// listenAndServeWithStopper wraps graceful.Server's
// ListenAndServe/ListenAndServeTLS and adds the ability to interrupt them with
// the provided stopper.Stopper.
func listenAndServeWithStopper(srv *graceful.Server, st *stopper.Stopper, certFile, keyFile string) {
go func() {
<-st.Chan()
srv.Stop(0)
}()
var err error
if certFile != "" && keyFile != "" {
log.Info("API: TLS Enabled")
err = srv.ListenAndServeTLS(certFile, keyFile)
} else {
err = srv.ListenAndServe()
}
if err != nil {
if opErr, ok := err.(*net.OpError); !ok || (ok && opErr.Op != "accept") {
log.Fatal(err)
}
}
}
// tlsClientConfig initializes a *tls.Config using the given CA. The resulting
// *tls.Config is meant to be used to configure an HTTP server to do client
// certificate authentication.
//
// If no CA is given, a nil *tls.Config is returned; no client certificate will
// be required and verified. In other words, authentication will be disabled.
func tlsClientConfig(caPath string) (*tls.Config, error) {
if caPath == "" {
return nil, nil
}
caCert, err := ioutil.ReadFile(caPath)
if err != nil {
return nil, err
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
tlsConfig := &tls.Config{
ClientCAs: caCertPool,
ClientAuth: tls.RequireAndVerifyClientCert,
}
return tlsConfig, nil
}