67e5c940c4
Update registry package to use the v2 registry api from distribution. Update interfaces to directly take in digests. Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
282 lines
8.3 KiB
Go
282 lines
8.3 KiB
Go
package registry
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"encoding/json"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"net"
|
|
"net/http"
|
|
"net/url"
|
|
"strings"
|
|
|
|
"github.com/Sirupsen/logrus"
|
|
"github.com/docker/distribution/registry/api/v2"
|
|
"github.com/docker/docker/pkg/requestdecorator"
|
|
)
|
|
|
|
// for mocking in unit tests
|
|
var lookupIP = net.LookupIP
|
|
|
|
// scans string for api version in the URL path. returns the trimmed address, if version found, string and API version.
|
|
func scanForAPIVersion(address string) (string, APIVersion) {
|
|
var (
|
|
chunks []string
|
|
apiVersionStr string
|
|
)
|
|
|
|
if strings.HasSuffix(address, "/") {
|
|
address = address[:len(address)-1]
|
|
}
|
|
|
|
chunks = strings.Split(address, "/")
|
|
apiVersionStr = chunks[len(chunks)-1]
|
|
|
|
for k, v := range apiVersions {
|
|
if apiVersionStr == v {
|
|
address = strings.Join(chunks[:len(chunks)-1], "/")
|
|
return address, k
|
|
}
|
|
}
|
|
|
|
return address, APIVersionUnknown
|
|
}
|
|
|
|
// NewEndpoint parses the given address to return a registry endpoint.
|
|
func NewEndpoint(index *IndexInfo) (*Endpoint, error) {
|
|
// *TODO: Allow per-registry configuration of endpoints.
|
|
endpoint, err := newEndpoint(index.GetAuthConfigKey(), index.Secure)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if err := validateEndpoint(endpoint); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return endpoint, nil
|
|
}
|
|
|
|
func validateEndpoint(endpoint *Endpoint) error {
|
|
logrus.Debugf("pinging registry endpoint %s", endpoint)
|
|
|
|
// Try HTTPS ping to registry
|
|
endpoint.URL.Scheme = "https"
|
|
if _, err := endpoint.Ping(); err != nil {
|
|
if endpoint.IsSecure {
|
|
// If registry is secure and HTTPS failed, show user the error and tell them about `--insecure-registry`
|
|
// in case that's what they need. DO NOT accept unknown CA certificates, and DO NOT fallback to HTTP.
|
|
return fmt.Errorf("invalid registry endpoint %s: %v. If this private registry supports only HTTP or HTTPS with an unknown CA certificate, please add `--insecure-registry %s` to the daemon's arguments. In the case of HTTPS, if you have access to the registry's CA certificate, no need for the flag; simply place the CA certificate at /etc/docker/certs.d/%s/ca.crt", endpoint, err, endpoint.URL.Host, endpoint.URL.Host)
|
|
}
|
|
|
|
// If registry is insecure and HTTPS failed, fallback to HTTP.
|
|
logrus.Debugf("Error from registry %q marked as insecure: %v. Insecurely falling back to HTTP", endpoint, err)
|
|
endpoint.URL.Scheme = "http"
|
|
|
|
var err2 error
|
|
if _, err2 = endpoint.Ping(); err2 == nil {
|
|
return nil
|
|
}
|
|
|
|
return fmt.Errorf("invalid registry endpoint %q. HTTPS attempt: %v. HTTP attempt: %v", endpoint, err, err2)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func newEndpoint(address string, secure bool) (*Endpoint, error) {
|
|
var (
|
|
endpoint = new(Endpoint)
|
|
trimmedAddress string
|
|
err error
|
|
)
|
|
|
|
if !strings.HasPrefix(address, "http") {
|
|
address = "https://" + address
|
|
}
|
|
|
|
trimmedAddress, endpoint.Version = scanForAPIVersion(address)
|
|
|
|
if endpoint.URL, err = url.Parse(trimmedAddress); err != nil {
|
|
return nil, err
|
|
}
|
|
endpoint.IsSecure = secure
|
|
return endpoint, nil
|
|
}
|
|
|
|
func (repoInfo *RepositoryInfo) GetEndpoint() (*Endpoint, error) {
|
|
return NewEndpoint(repoInfo.Index)
|
|
}
|
|
|
|
// Endpoint stores basic information about a registry endpoint.
|
|
type Endpoint struct {
|
|
URL *url.URL
|
|
Version APIVersion
|
|
IsSecure bool
|
|
AuthChallenges []*AuthorizationChallenge
|
|
URLBuilder *v2.URLBuilder
|
|
}
|
|
|
|
// Get the formated URL for the root of this registry Endpoint
|
|
func (e *Endpoint) String() string {
|
|
return fmt.Sprintf("%s/v%d/", e.URL, e.Version)
|
|
}
|
|
|
|
// VersionString returns a formatted string of this
|
|
// endpoint address using the given API Version.
|
|
func (e *Endpoint) VersionString(version APIVersion) string {
|
|
return fmt.Sprintf("%s/v%d/", e.URL, version)
|
|
}
|
|
|
|
// Path returns a formatted string for the URL
|
|
// of this endpoint with the given path appended.
|
|
func (e *Endpoint) Path(path string) string {
|
|
return fmt.Sprintf("%s/v%d/%s", e.URL, e.Version, path)
|
|
}
|
|
|
|
func (e *Endpoint) Ping() (RegistryInfo, error) {
|
|
// The ping logic to use is determined by the registry endpoint version.
|
|
factory := HTTPRequestFactory(nil)
|
|
switch e.Version {
|
|
case APIVersion1:
|
|
return e.pingV1(factory)
|
|
case APIVersion2:
|
|
return e.pingV2(factory)
|
|
}
|
|
|
|
// APIVersionUnknown
|
|
// We should try v2 first...
|
|
e.Version = APIVersion2
|
|
regInfo, errV2 := e.pingV2(factory)
|
|
if errV2 == nil {
|
|
return regInfo, nil
|
|
}
|
|
|
|
// ... then fallback to v1.
|
|
e.Version = APIVersion1
|
|
regInfo, errV1 := e.pingV1(factory)
|
|
if errV1 == nil {
|
|
return regInfo, nil
|
|
}
|
|
|
|
e.Version = APIVersionUnknown
|
|
return RegistryInfo{}, fmt.Errorf("unable to ping registry endpoint %s\nv2 ping attempt failed with error: %s\n v1 ping attempt failed with error: %s", e, errV2, errV1)
|
|
}
|
|
|
|
func (e *Endpoint) pingV1(factory *requestdecorator.RequestFactory) (RegistryInfo, error) {
|
|
logrus.Debugf("attempting v1 ping for registry endpoint %s", e)
|
|
|
|
if e.String() == IndexServerAddress() {
|
|
// Skip the check, we know this one is valid
|
|
// (and we never want to fallback to http in case of error)
|
|
return RegistryInfo{Standalone: false}, nil
|
|
}
|
|
|
|
req, err := factory.NewRequest("GET", e.Path("_ping"), nil)
|
|
if err != nil {
|
|
return RegistryInfo{Standalone: false}, err
|
|
}
|
|
|
|
resp, _, err := doRequest(req, nil, ConnectTimeout, e.IsSecure)
|
|
if err != nil {
|
|
return RegistryInfo{Standalone: false}, err
|
|
}
|
|
|
|
defer resp.Body.Close()
|
|
|
|
jsonString, err := ioutil.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return RegistryInfo{Standalone: false}, fmt.Errorf("error while reading the http response: %s", err)
|
|
}
|
|
|
|
// If the header is absent, we assume true for compatibility with earlier
|
|
// versions of the registry. default to true
|
|
info := RegistryInfo{
|
|
Standalone: true,
|
|
}
|
|
if err := json.Unmarshal(jsonString, &info); err != nil {
|
|
logrus.Debugf("Error unmarshalling the _ping RegistryInfo: %s", err)
|
|
// don't stop here. Just assume sane defaults
|
|
}
|
|
if hdr := resp.Header.Get("X-Docker-Registry-Version"); hdr != "" {
|
|
logrus.Debugf("Registry version header: '%s'", hdr)
|
|
info.Version = hdr
|
|
}
|
|
logrus.Debugf("RegistryInfo.Version: %q", info.Version)
|
|
|
|
standalone := resp.Header.Get("X-Docker-Registry-Standalone")
|
|
logrus.Debugf("Registry standalone header: '%s'", standalone)
|
|
// Accepted values are "true" (case-insensitive) and "1".
|
|
if strings.EqualFold(standalone, "true") || standalone == "1" {
|
|
info.Standalone = true
|
|
} else if len(standalone) > 0 {
|
|
// there is a header set, and it is not "true" or "1", so assume fails
|
|
info.Standalone = false
|
|
}
|
|
logrus.Debugf("RegistryInfo.Standalone: %t", info.Standalone)
|
|
return info, nil
|
|
}
|
|
|
|
func (e *Endpoint) pingV2(factory *requestdecorator.RequestFactory) (RegistryInfo, error) {
|
|
logrus.Debugf("attempting v2 ping for registry endpoint %s", e)
|
|
|
|
req, err := factory.NewRequest("GET", e.Path(""), nil)
|
|
if err != nil {
|
|
return RegistryInfo{}, err
|
|
}
|
|
|
|
resp, _, err := doRequest(req, nil, ConnectTimeout, e.IsSecure)
|
|
if err != nil {
|
|
return RegistryInfo{}, err
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
// The endpoint may have multiple supported versions.
|
|
// Ensure it supports the v2 Registry API.
|
|
var supportsV2 bool
|
|
|
|
HeaderLoop:
|
|
for _, supportedVersions := range resp.Header[http.CanonicalHeaderKey("Docker-Distribution-API-Version")] {
|
|
for _, versionName := range strings.Fields(supportedVersions) {
|
|
if versionName == "registry/2.0" {
|
|
supportsV2 = true
|
|
break HeaderLoop
|
|
}
|
|
}
|
|
}
|
|
|
|
if !supportsV2 {
|
|
return RegistryInfo{}, fmt.Errorf("%s does not appear to be a v2 registry endpoint", e)
|
|
}
|
|
|
|
if resp.StatusCode == http.StatusOK {
|
|
// It would seem that no authentication/authorization is required.
|
|
// So we don't need to parse/add any authorization schemes.
|
|
return RegistryInfo{Standalone: true}, nil
|
|
}
|
|
|
|
if resp.StatusCode == http.StatusUnauthorized {
|
|
// Parse the WWW-Authenticate Header and store the challenges
|
|
// on this endpoint object.
|
|
e.AuthChallenges = parseAuthHeader(resp.Header)
|
|
return RegistryInfo{}, nil
|
|
}
|
|
|
|
return RegistryInfo{}, fmt.Errorf("v2 registry endpoint returned status %d: %q", resp.StatusCode, http.StatusText(resp.StatusCode))
|
|
}
|
|
|
|
func (e *Endpoint) HTTPClient() *http.Client {
|
|
tlsConfig := tls.Config{
|
|
MinVersion: tls.VersionTLS10,
|
|
}
|
|
if !e.IsSecure {
|
|
tlsConfig.InsecureSkipVerify = true
|
|
}
|
|
return &http.Client{
|
|
Transport: &http.Transport{
|
|
DisableKeepAlives: true,
|
|
Proxy: http.ProxyFromEnvironment,
|
|
TLSClientConfig: &tlsConfig,
|
|
},
|
|
CheckRedirect: AddRequiredHeadersToRedirectedRequests,
|
|
}
|
|
}
|