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// Copyright 2015 go-dockerclient authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package docker
import (
"bytes"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"strings"
)
// ErrCannotParseDockercfg is the error returned by NewAuthConfigurations when the dockercfg cannot be parsed.
var ErrCannotParseDockercfg = errors.New("Failed to read authentication from dockercfg")
// AuthConfiguration represents authentication options to use in the PushImage
// method. It represents the authentication in the Docker index server.
type AuthConfiguration struct {
Username string `json:"username,omitempty"`
Password string `json:"password,omitempty"`
Email string `json:"email,omitempty"`
ServerAddress string `json:"serveraddress,omitempty"`
}
// AuthConfigurations represents authentication options to use for the
// PushImage method accommodating the new X-Registry-Config header
type AuthConfigurations struct {
Configs map[string]AuthConfiguration `json:"configs"`
}
// AuthConfigurations119 is used to serialize a set of AuthConfigurations
// for Docker API >= 1.19.
type AuthConfigurations119 map[string]AuthConfiguration
// dockerConfig represents a registry authentation configuration from the
// .dockercfg file.
type dockerConfig struct {
Auth string `json:"auth"`
Email string `json:"email"`
}
// NewAuthConfigurationsFromFile returns AuthConfigurations from a path containing JSON
// in the same format as the .dockercfg file.
func NewAuthConfigurationsFromFile(path string) (*AuthConfigurations, error) {
r, err := os.Open(path)
if err != nil {
return nil, err
}
return NewAuthConfigurations(r)
}
func cfgPaths(dockerConfigEnv string, homeEnv string) []string {
var paths []string
if dockerConfigEnv != "" {
paths = append(paths, path.Join(dockerConfigEnv, "config.json"))
}
if homeEnv != "" {
paths = append(paths, path.Join(homeEnv, ".docker", "config.json"))
paths = append(paths, path.Join(homeEnv, ".dockercfg"))
}
return paths
}
// NewAuthConfigurationsFromDockerCfg returns AuthConfigurations from
// system config files. The following files are checked in the order listed:
// - $DOCKER_CONFIG/config.json if DOCKER_CONFIG set in the environment,
// - $HOME/.docker/config.json
// - $HOME/.dockercfg
func NewAuthConfigurationsFromDockerCfg() (*AuthConfigurations, error) {
err := fmt.Errorf("No docker configuration found")
var auths *AuthConfigurations
pathsToTry := cfgPaths(os.Getenv("DOCKER_CONFIG"), os.Getenv("HOME"))
for _, path := range pathsToTry {
auths, err = NewAuthConfigurationsFromFile(path)
if err == nil {
return auths, nil
}
}
return auths, err
}
// NewAuthConfigurations returns AuthConfigurations from a JSON encoded string in the
// same format as the .dockercfg file.
func NewAuthConfigurations(r io.Reader) (*AuthConfigurations, error) {
var auth *AuthConfigurations
confs, err := parseDockerConfig(r)
if err != nil {
return nil, err
}
auth, err = authConfigs(confs)
if err != nil {
return nil, err
}
return auth, nil
}
func parseDockerConfig(r io.Reader) (map[string]dockerConfig, error) {
buf := new(bytes.Buffer)
buf.ReadFrom(r)
byteData := buf.Bytes()
confsWrapper := struct {
Auths map[string]dockerConfig `json:"auths"`
}{}
if err := json.Unmarshal(byteData, &confsWrapper); err == nil {
if len(confsWrapper.Auths) > 0 {
return confsWrapper.Auths, nil
}
}
var confs map[string]dockerConfig
if err := json.Unmarshal(byteData, &confs); err != nil {
return nil, err
}
return confs, nil
}
// authConfigs converts a dockerConfigs map to a AuthConfigurations object.
func authConfigs(confs map[string]dockerConfig) (*AuthConfigurations, error) {
c := &AuthConfigurations{
Configs: make(map[string]AuthConfiguration),
}
for reg, conf := range confs {
if conf.Auth == "" {
continue
}
data, err := base64.StdEncoding.DecodeString(conf.Auth)
if err != nil {
return nil, err
}
userpass := strings.SplitN(string(data), ":", 2)
if len(userpass) != 2 {
return nil, ErrCannotParseDockercfg
}
c.Configs[reg] = AuthConfiguration{
Email: conf.Email,
Username: userpass[0],
Password: userpass[1],
ServerAddress: reg,
}
}
return c, nil
}
// AuthStatus returns the authentication status for Docker API versions >= 1.23.
type AuthStatus struct {
Status string `json:"Status,omitempty" yaml:"Status,omitempty" toml:"Status,omitempty"`
IdentityToken string `json:"IdentityToken,omitempty" yaml:"IdentityToken,omitempty" toml:"IdentityToken,omitempty"`
}
// AuthCheck validates the given credentials. It returns nil if successful.
//
// For Docker API versions >= 1.23, the AuthStatus struct will be populated, otherwise it will be empty.`
//
// See https://goo.gl/6nsZkH for more details.
func (c *Client) AuthCheck(conf *AuthConfiguration) (AuthStatus, error) {
var authStatus AuthStatus
if conf == nil {
return authStatus, errors.New("conf is nil")
}
resp, err := c.do("POST", "/auth", doOptions{data: conf})
if err != nil {
return authStatus, err
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return authStatus, err
}
if len(data) == 0 {
return authStatus, nil
}
if err := json.Unmarshal(data, &authStatus); err != nil {
return authStatus, err
}
return authStatus, nil
}
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