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auth.go
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auth.go
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package registry
import (
"crypto/tls"
"encoding/base64"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/containers/image/pkg/docker/config"
"github.com/containers/image/types"
"github.com/docker/distribution/registry/client/auth/challenge"
"github.com/pkg/errors"
)
var (
insecureClient = &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
},
}
)
func LoadAuthForRegistry(endpoint string) (string, string, error) {
sys := &types.SystemContext{}
username, password, err := config.GetAuthentication(sys, endpoint)
if err != nil {
return "", "", errors.Wrapf(err, "error loading username and password")
}
return username, password, nil
}
func TestPushAccess(endpoint, username, password, org string) error {
endpoint = sanitizeEndpoint(endpoint)
// We need to check if we can push images to a repo.
// We cannot get push permission to an org alone.
scope := org + "/testrepo"
basicAuthToken := makeBasicAuthToken(username, password)
if IsECREndpoint(endpoint) {
token, err := GetECRBasicAuthToken(endpoint, username, password)
if err != nil {
return errors.Wrap(err, "failed to ping registry")
}
basicAuthToken = token
scope = org // ECR has no concept of organization and it should be an empty string
}
// TODO: Support http
pingURL := fmt.Sprintf("https://%s/v2/", endpoint)
resp, err := insecureClient.Get(pingURL)
if err != nil {
return errors.Wrap(err, "failed to ping registry")
}
if resp.StatusCode == http.StatusOK {
// Anonymous registry that does not require authentication
return nil
}
if resp.StatusCode != http.StatusUnauthorized {
return errors.Errorf("unexpected status code: %v", resp.StatusCode)
}
challenges := challenge.ResponseChallenges(resp)
if len(challenges) == 0 {
return errors.Wrap(err, "no auth challenges found for endpoint")
}
if challenges[0].Scheme == "basic" {
// ecr uses basic auth. not much more we can do here without actually pushing an image
return nil
}
host := challenges[0].Parameters["realm"]
v := url.Values{}
v.Set("service", challenges[0].Parameters["service"])
v.Set("scope", fmt.Sprintf("repository:%s:push", scope))
authURL := host + "?" + v.Encode()
req, err := http.NewRequest("GET", authURL, nil)
if err != nil {
return errors.Wrap(err, "failed to create auth request")
}
req.Header.Set("Authorization", fmt.Sprintf("Basic %s", basicAuthToken))
resp, err = insecureClient.Do(req)
if err != nil {
return errors.Wrap(err, "failed to execute auth request")
}
defer resp.Body.Close()
authBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
return errors.Wrap(err, "failed to load auth response")
}
if resp.StatusCode != http.StatusOK {
return errors.New(errorResponseToString(authBody))
}
if strings.Contains(endpoint, "gcr.io") {
// gcr tokens are in a different format. it's enough to test that a token has been issued.
return nil
}
bearerToken, err := newBearerTokenFromJSONBlob(authBody)
if err != nil {
return errors.Wrap(err, "failed to parse bearer token")
}
jwtToken, err := bearerToken.getJwtToken()
if err != nil {
return errors.Wrap(err, "failed to parse JWT token")
}
claims, err := getJwtTokenClaims(jwtToken)
if err != nil {
return errors.Wrap(err, "failed to get claims")
}
for _, access := range claims.Access {
if access.Type != "repository" {
continue
}
if access.Name != scope {
continue
}
for _, action := range access.Actions {
if action == "push" {
return nil
}
}
}
return errors.Errorf("%q has no push permission in %q", username, org)
}
func makeBasicAuthToken(username, password string) string {
token := fmt.Sprintf("%s:%s", username, password)
return base64.StdEncoding.EncodeToString([]byte(token))
}
func sanitizeEndpoint(endpoint string) string {
endpoint = strings.TrimPrefix(endpoint, "http://")
endpoint = strings.TrimPrefix(endpoint, "https://")
endpoint = strings.TrimSuffix(endpoint, "/v2/")
endpoint = strings.TrimSuffix(endpoint, "/v2")
endpoint = strings.TrimSuffix(endpoint, "/v1/")
endpoint = strings.TrimSuffix(endpoint, "/v1")
return endpoint
}