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// Copyright 2018 Google LLC 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 authn
import (
"encoding/base64"
"encoding/json"
"fmt"
"strings"
)
// Authenticator is used to authenticate Docker transports.
type Authenticator interface {
// Authorization returns the value to use in an http transport's Authorization header.
Authorization() (*AuthConfig, error)
}
// AuthConfig contains authorization information for connecting to a Registry
// Inlined what we use from github.com/docker/cli/cli/config/types
type AuthConfig struct {
Username string `json:"username,omitempty"`
Password string `json:"password,omitempty"`
Auth string `json:"auth,omitempty"`
// IdentityToken is used to authenticate the user and get
// an access token for the registry.
IdentityToken string `json:"identitytoken,omitempty"`
// RegistryToken is a bearer token to be sent to a registry
RegistryToken string `json:"registrytoken,omitempty"`
}
// This is effectively a copy of the type AuthConfig. This simplifies
// JSON unmarshalling since AuthConfig methods are not inherited
type authConfig AuthConfig
// UnmarshalJSON implements json.Unmarshaler
func (a *AuthConfig) UnmarshalJSON(data []byte) error {
var shadow authConfig
err := json.Unmarshal(data, &shadow)
if err != nil {
return err
}
*a = (AuthConfig)(shadow)
if len(shadow.Auth) != 0 {
var derr error
a.Username, a.Password, derr = decodeDockerConfigFieldAuth(shadow.Auth)
if derr != nil {
err = fmt.Errorf("unable to decode auth field: %w", derr)
}
} else if len(a.Username) != 0 && len(a.Password) != 0 {
a.Auth = encodeDockerConfigFieldAuth(shadow.Username, shadow.Password)
}
return err
}
// MarshalJSON implements json.Marshaler
func (a AuthConfig) MarshalJSON() ([]byte, error) {
shadow := (authConfig)(a)
shadow.Auth = encodeDockerConfigFieldAuth(shadow.Username, shadow.Password)
return json.Marshal(shadow)
}
// decodeDockerConfigFieldAuth deserializes the "auth" field from dockercfg into a
// username and a password. The format of the auth field is base64(<username>:<password>).
//
// From https://github.com/kubernetes/kubernetes/blob/75e49ec824b183288e1dbaccfd7dbe77d89db381/pkg/credentialprovider/config.go
// Copyright 2014 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
func decodeDockerConfigFieldAuth(field string) (username, password string, err error) {
var decoded []byte
// StdEncoding can only decode padded string
// RawStdEncoding can only decode unpadded string
if strings.HasSuffix(strings.TrimSpace(field), "=") {
// decode padded data
decoded, err = base64.StdEncoding.DecodeString(field)
} else {
// decode unpadded data
decoded, err = base64.RawStdEncoding.DecodeString(field)
}
if err != nil {
return
}
parts := strings.SplitN(string(decoded), ":", 2)
if len(parts) != 2 {
err = fmt.Errorf("must be formatted as base64(username:password)")
return
}
username = parts[0]
password = parts[1]
return
}
func encodeDockerConfigFieldAuth(username, password string) string {
return base64.StdEncoding.EncodeToString([]byte(username + ":" + password))
}
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