/
extractor.go
148 lines (122 loc) · 4.19 KB
/
extractor.go
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// Copyright © 2022 Cisco Systems, Inc. and its affiliates.
// All rights reserved.
//
// 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 creds
import (
"context"
"fmt"
"os"
"path"
"github.com/containers/image/v5/docker/reference"
"github.com/google/go-containerregistry/pkg/authn"
"github.com/google/go-containerregistry/pkg/authn/k8schain"
"github.com/google/go-containerregistry/pkg/name"
log "github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
)
func GetAuthConfig(ipsPath string, imageName string) (*authn.AuthConfig, error) {
named, err := reference.ParseNormalizedNamed(imageName)
if err != nil {
return nil, fmt.Errorf("failed to normalized image name: %v", err)
}
keychain, err := newKeyChain(context.TODO(), ipsPath)
if err != nil {
return nil, fmt.Errorf("failed to create keychain: %v", err)
}
repository, err := name.NewRepository(reference.FamiliarName(named))
if err != nil {
return nil, fmt.Errorf("failed to create repository: %v", err)
}
authenticator, err := keychain.Resolve(repository)
if err != nil {
return nil, fmt.Errorf("failed to create authenticator: %v", err)
}
authorization, err := authenticator.Authorization()
if err != nil {
return nil, fmt.Errorf("failed to create authorization: %v", err)
}
return authorization, nil
}
func newKeyChain(ctx context.Context, ipsPath string) (authn.Keychain, error) {
if ipsPath == "" {
keychain, err := k8schain.NewNoClient(ctx)
if err != nil {
return nil, fmt.Errorf("failed to create no client keychain: %w", err)
}
return keychain, nil
}
secrets, err := readImagePullSecrets(ipsPath)
if err != nil {
return nil, fmt.Errorf("fail to read image pull secrets: %w", err)
}
keychain, err := k8schain.NewFromPullSecrets(ctx, secrets)
if err != nil {
return nil, fmt.Errorf("unable to load keychain from image pull secrets: %w", err)
}
return keychain, nil
}
func readImagePullSecrets(ipsPath string) ([]corev1.Secret, error) {
secrets := []corev1.Secret{}
files, err := os.ReadDir(ipsPath)
if err != nil {
return nil, fmt.Errorf("unable to read path %s: %w", ipsPath, err)
}
for _, file := range files {
// We expect directories for each secret in ipsPath
if !file.IsDir() {
continue
}
secretPath := path.Join(ipsPath, file.Name())
secretType, secretDataKey, err := determineSecretTypeAndKey(secretPath)
if err != nil {
return nil, fmt.Errorf("unable to determine type of secret %s: %w", file.Name(), err)
}
if secretType != corev1.SecretTypeDockerConfigJson && secretType != corev1.SecretTypeDockercfg {
log.Warnf("Secret %s is not a supported image pull secret type, ignoring.", file.Name())
continue
}
secretFilePath := path.Join(ipsPath, file.Name(), secretDataKey)
secretDataBytes, err := os.ReadFile(secretFilePath)
if err != nil {
return nil, fmt.Errorf("unable to read secret file %s: %w", secretFilePath, err)
}
secrets = append(secrets, corev1.Secret{
Type: secretType,
Data: map[string][]byte{
secretDataKey: secretDataBytes,
},
})
}
return secrets, nil
}
func determineSecretTypeAndKey(secretPath string) (corev1.SecretType, string, error) {
var unsetSecretType corev1.SecretType
secretFiles, err := os.ReadDir(secretPath)
if err != nil {
return unsetSecretType, "", fmt.Errorf("unable to read secret directory %s: %w", secretPath, err)
}
for _, secretFile := range secretFiles {
// We only want files at this point
if secretFile.IsDir() {
continue
}
switch secretFile.Name() {
case corev1.DockerConfigJsonKey:
return corev1.SecretTypeDockerConfigJson, corev1.DockerConfigJsonKey, nil
case corev1.DockerConfigKey:
return corev1.SecretTypeDockercfg, corev1.DockerConfigKey, nil
}
}
return unsetSecretType, "", nil
}