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// Package registry contains client primitives to interact with a remote Docker registry.
package registry
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"path/filepath"
"runtime"
"strings"
"syscall"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/distribution/registry/api/errcode"
"github.com/docker/distribution/registry/api/v2"
"github.com/docker/distribution/registry/client"
"github.com/docker/distribution/registry/client/transport"
"github.com/docker/docker/dockerversion"
"github.com/docker/docker/pkg/parsers/kernel"
"github.com/docker/docker/pkg/useragent"
"github.com/docker/go-connections/tlsconfig"
)
var (
// ErrAlreadyExists is an error returned if an image being pushed
// already exists on the remote side
ErrAlreadyExists = errors.New("Image already exists")
errLoginRequired = errors.New("Authentication is required.")
)
// dockerUserAgent is the User-Agent the Docker client uses to identify itself.
// It is populated on init(), comprising version information of different components.
var dockerUserAgent string
func init() {
httpVersion := make([]useragent.VersionInfo, 0, 6)
httpVersion = append(httpVersion, useragent.VersionInfo{Name: "docker", Version: dockerversion.Version})
httpVersion = append(httpVersion, useragent.VersionInfo{Name: "go", Version: runtime.Version()})
httpVersion = append(httpVersion, useragent.VersionInfo{Name: "git-commit", Version: dockerversion.GitCommit})
if kernelVersion, err := kernel.GetKernelVersion(); err == nil {
httpVersion = append(httpVersion, useragent.VersionInfo{Name: "kernel", Version: kernelVersion.String()})
}
httpVersion = append(httpVersion, useragent.VersionInfo{Name: "os", Version: runtime.GOOS})
httpVersion = append(httpVersion, useragent.VersionInfo{Name: "arch", Version: runtime.GOARCH})
dockerUserAgent = useragent.AppendVersions("", httpVersion...)
if runtime.GOOS != "linux" {
V2Only = true
}
}
func newTLSConfig(hostname string, isSecure bool) (*tls.Config, error) {
// PreferredServerCipherSuites should have no effect
tlsConfig := tlsconfig.ServerDefault
tlsConfig.InsecureSkipVerify = !isSecure
if isSecure && CertsDir != "" {
hostDir := filepath.Join(CertsDir, cleanPath(hostname))
logrus.Debugf("hostDir: %s", hostDir)
if err := ReadCertsDirectory(&tlsConfig, hostDir); err != nil {
return nil, err
}
}
return &tlsConfig, nil
}
func hasFile(files []os.FileInfo, name string) bool {
for _, f := range files {
if f.Name() == name {
return true
}
}
return false
}
// ReadCertsDirectory reads the directory for TLS certificates
// including roots and certificate pairs and updates the
// provided TLS configuration.
func ReadCertsDirectory(tlsConfig *tls.Config, directory string) error {
fs, err := ioutil.ReadDir(directory)
if err != nil && !os.IsNotExist(err) {
return err
}
for _, f := range fs {
if strings.HasSuffix(f.Name(), ".crt") {
if tlsConfig.RootCAs == nil {
// TODO(dmcgowan): Copy system pool
tlsConfig.RootCAs = x509.NewCertPool()
}
logrus.Debugf("crt: %s", filepath.Join(directory, f.Name()))
data, err := ioutil.ReadFile(filepath.Join(directory, f.Name()))
if err != nil {
return err
}
tlsConfig.RootCAs.AppendCertsFromPEM(data)
}
if strings.HasSuffix(f.Name(), ".cert") {
certName := f.Name()
keyName := certName[:len(certName)-5] + ".key"
logrus.Debugf("cert: %s", filepath.Join(directory, f.Name()))
if !hasFile(fs, keyName) {
return fmt.Errorf("Missing key %s for certificate %s", keyName, certName)
}
cert, err := tls.LoadX509KeyPair(filepath.Join(directory, certName), filepath.Join(directory, keyName))
if err != nil {
return err
}
tlsConfig.Certificates = append(tlsConfig.Certificates, cert)
}
if strings.HasSuffix(f.Name(), ".key") {
keyName := f.Name()
certName := keyName[:len(keyName)-4] + ".cert"
logrus.Debugf("key: %s", filepath.Join(directory, f.Name()))
if !hasFile(fs, certName) {
return fmt.Errorf("Missing certificate %s for key %s", certName, keyName)
}
}
}
return nil
}
// DockerHeaders returns request modifiers that ensure requests have
// the User-Agent header set to dockerUserAgent and that metaHeaders
// are added.
func DockerHeaders(metaHeaders http.Header) []transport.RequestModifier {
modifiers := []transport.RequestModifier{
transport.NewHeaderRequestModifier(http.Header{"User-Agent": []string{dockerUserAgent}}),
}
if metaHeaders != nil {
modifiers = append(modifiers, transport.NewHeaderRequestModifier(metaHeaders))
}
return modifiers
}
// HTTPClient returns a HTTP client structure which uses the given transport
// and contains the necessary headers for redirected requests
func HTTPClient(transport http.RoundTripper) *http.Client {
return &http.Client{
Transport: transport,
CheckRedirect: addRequiredHeadersToRedirectedRequests,
}
}
func trustedLocation(req *http.Request) bool {
var (
trusteds = []string{"docker.com", "docker.io"}
hostname = strings.SplitN(req.Host, ":", 2)[0]
)
if req.URL.Scheme != "https" {
return false
}
for _, trusted := range trusteds {
if hostname == trusted || strings.HasSuffix(hostname, "."+trusted) {
return true
}
}
return false
}
// addRequiredHeadersToRedirectedRequests adds the necessary redirection headers
// for redirected requests
func addRequiredHeadersToRedirectedRequests(req *http.Request, via []*http.Request) error {
if via != nil && via[0] != nil {
if trustedLocation(req) && trustedLocation(via[0]) {
req.Header = via[0].Header
return nil
}
for k, v := range via[0].Header {
if k != "Authorization" {
for _, vv := range v {
req.Header.Add(k, vv)
}
}
}
}
return nil
}
// ShouldV2Fallback returns true if this error is a reason to fall back to v1.
func ShouldV2Fallback(err errcode.Error) bool {
switch err.Code {
case errcode.ErrorCodeUnauthorized, v2.ErrorCodeManifestUnknown, v2.ErrorCodeNameUnknown:
return true
}
return false
}
// ErrNoSupport is an error type used for errors indicating that an operation
// is not supported. It encapsulates a more specific error.
type ErrNoSupport struct{ Err error }
func (e ErrNoSupport) Error() string {
if e.Err == nil {
return "not supported"
}
return e.Err.Error()
}
// ContinueOnError returns true if we should fallback to the next endpoint
// as a result of this error.
func ContinueOnError(err error) bool {
switch v := err.(type) {
case errcode.Errors:
if len(v) == 0 {
return true
}
return ContinueOnError(v[0])
case ErrNoSupport:
return ContinueOnError(v.Err)
case errcode.Error:
return ShouldV2Fallback(v)
case *client.UnexpectedHTTPResponseError:
return true
case error:
return !strings.Contains(err.Error(), strings.ToLower(syscall.ENOSPC.Error()))
}
// let's be nice and fallback if the error is a completely
// unexpected one.
// If new errors have to be handled in some way, please
// add them to the switch above.
return true
}
// NewTransport returns a new HTTP transport. If tlsConfig is nil, it uses the
// default TLS configuration.
func NewTransport(tlsConfig *tls.Config) *http.Transport {
if tlsConfig == nil {
var cfg = tlsconfig.ServerDefault
tlsConfig = &cfg
}
return &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).Dial,
TLSHandshakeTimeout: 10 * time.Second,
TLSClientConfig: tlsConfig,
// TODO(dmcgowan): Call close idle connections when complete and use keep alive
DisableKeepAlives: true,
}
}
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