/
file.go
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/
file.go
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package configfile
import (
"encoding/base64"
"encoding/json"
"io"
"os"
"path/filepath"
"strings"
"github.com/docker/cli/cli/config/credentials"
"github.com/docker/cli/cli/config/types"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// ConfigFile ~/.docker/config.json file info
type ConfigFile struct {
AuthConfigs map[string]types.AuthConfig `json:"auths"`
HTTPHeaders map[string]string `json:"HttpHeaders,omitempty"`
PsFormat string `json:"psFormat,omitempty"`
ImagesFormat string `json:"imagesFormat,omitempty"`
NetworksFormat string `json:"networksFormat,omitempty"`
PluginsFormat string `json:"pluginsFormat,omitempty"`
VolumesFormat string `json:"volumesFormat,omitempty"`
StatsFormat string `json:"statsFormat,omitempty"`
DetachKeys string `json:"detachKeys,omitempty"`
CredentialsStore string `json:"credsStore,omitempty"`
CredentialHelpers map[string]string `json:"credHelpers,omitempty"`
Filename string `json:"-"` // Note: for internal use only
ServiceInspectFormat string `json:"serviceInspectFormat,omitempty"`
ServicesFormat string `json:"servicesFormat,omitempty"`
TasksFormat string `json:"tasksFormat,omitempty"`
SecretFormat string `json:"secretFormat,omitempty"`
ConfigFormat string `json:"configFormat,omitempty"`
NodesFormat string `json:"nodesFormat,omitempty"`
PruneFilters []string `json:"pruneFilters,omitempty"`
Proxies map[string]ProxyConfig `json:"proxies,omitempty"`
Experimental string `json:"experimental,omitempty"`
CurrentContext string `json:"currentContext,omitempty"`
CLIPluginsExtraDirs []string `json:"cliPluginsExtraDirs,omitempty"`
Plugins map[string]map[string]string `json:"plugins,omitempty"`
Aliases map[string]string `json:"aliases,omitempty"`
Features map[string]string `json:"features,omitempty"`
}
// ProxyConfig contains proxy configuration settings
type ProxyConfig struct {
HTTPProxy string `json:"httpProxy,omitempty"`
HTTPSProxy string `json:"httpsProxy,omitempty"`
NoProxy string `json:"noProxy,omitempty"`
FTPProxy string `json:"ftpProxy,omitempty"`
AllProxy string `json:"allProxy,omitempty"`
}
// New initializes an empty configuration file for the given filename 'fn'
func New(fn string) *ConfigFile {
return &ConfigFile{
AuthConfigs: make(map[string]types.AuthConfig),
HTTPHeaders: make(map[string]string),
Filename: fn,
Plugins: make(map[string]map[string]string),
Aliases: make(map[string]string),
}
}
// LoadFromReader reads the configuration data given and sets up the auth config
// information with given directory and populates the receiver object
func (configFile *ConfigFile) LoadFromReader(configData io.Reader) error {
if err := json.NewDecoder(configData).Decode(configFile); err != nil && !errors.Is(err, io.EOF) {
return err
}
var err error
for addr, ac := range configFile.AuthConfigs {
if ac.Auth != "" {
ac.Username, ac.Password, err = decodeAuth(ac.Auth)
if err != nil {
return err
}
}
ac.Auth = ""
ac.ServerAddress = addr
configFile.AuthConfigs[addr] = ac
}
return nil
}
// ContainsAuth returns whether there is authentication configured
// in this file or not.
func (configFile *ConfigFile) ContainsAuth() bool {
return configFile.CredentialsStore != "" ||
len(configFile.CredentialHelpers) > 0 ||
len(configFile.AuthConfigs) > 0
}
// GetAuthConfigs returns the mapping of repo to auth configuration
func (configFile *ConfigFile) GetAuthConfigs() map[string]types.AuthConfig {
if configFile.AuthConfigs == nil {
configFile.AuthConfigs = make(map[string]types.AuthConfig)
}
return configFile.AuthConfigs
}
// SaveToWriter encodes and writes out all the authorization information to
// the given writer
func (configFile *ConfigFile) SaveToWriter(writer io.Writer) error {
// Encode sensitive data into a new/temp struct
tmpAuthConfigs := make(map[string]types.AuthConfig, len(configFile.AuthConfigs))
for k, authConfig := range configFile.AuthConfigs {
authCopy := authConfig
// encode and save the authstring, while blanking out the original fields
authCopy.Auth = encodeAuth(&authCopy)
authCopy.Username = ""
authCopy.Password = ""
authCopy.ServerAddress = ""
tmpAuthConfigs[k] = authCopy
}
saveAuthConfigs := configFile.AuthConfigs
configFile.AuthConfigs = tmpAuthConfigs
defer func() { configFile.AuthConfigs = saveAuthConfigs }()
// User-Agent header is automatically set, and should not be stored in the configuration
for v := range configFile.HTTPHeaders {
if strings.EqualFold(v, "User-Agent") {
delete(configFile.HTTPHeaders, v)
}
}
data, err := json.MarshalIndent(configFile, "", "\t")
if err != nil {
return err
}
_, err = writer.Write(data)
return err
}
// Save encodes and writes out all the authorization information
func (configFile *ConfigFile) Save() (retErr error) {
if configFile.Filename == "" {
return errors.Errorf("Can't save config with empty filename")
}
dir := filepath.Dir(configFile.Filename)
if err := os.MkdirAll(dir, 0o700); err != nil {
return err
}
temp, err := os.CreateTemp(dir, filepath.Base(configFile.Filename))
if err != nil {
return err
}
defer func() {
temp.Close()
if retErr != nil {
if err := os.Remove(temp.Name()); err != nil {
logrus.WithError(err).WithField("file", temp.Name()).Debug("Error cleaning up temp file")
}
}
}()
err = configFile.SaveToWriter(temp)
if err != nil {
return err
}
if err := temp.Close(); err != nil {
return errors.Wrap(err, "error closing temp file")
}
// Handle situation where the configfile is a symlink
cfgFile := configFile.Filename
if f, err := os.Readlink(cfgFile); err == nil {
cfgFile = f
}
// Try copying the current config file (if any) ownership and permissions
copyFilePermissions(cfgFile, temp.Name())
return os.Rename(temp.Name(), cfgFile)
}
// ParseProxyConfig computes proxy configuration by retrieving the config for the provided host and
// then checking this against any environment variables provided to the container
func (configFile *ConfigFile) ParseProxyConfig(host string, runOpts map[string]*string) map[string]*string {
var cfgKey string
if _, ok := configFile.Proxies[host]; !ok {
cfgKey = "default"
} else {
cfgKey = host
}
config := configFile.Proxies[cfgKey]
permitted := map[string]*string{
"HTTP_PROXY": &config.HTTPProxy,
"HTTPS_PROXY": &config.HTTPSProxy,
"NO_PROXY": &config.NoProxy,
"FTP_PROXY": &config.FTPProxy,
"ALL_PROXY": &config.AllProxy,
}
m := runOpts
if m == nil {
m = make(map[string]*string)
}
for k := range permitted {
if *permitted[k] == "" {
continue
}
if _, ok := m[k]; !ok {
m[k] = permitted[k]
}
if _, ok := m[strings.ToLower(k)]; !ok {
m[strings.ToLower(k)] = permitted[k]
}
}
return m
}
// encodeAuth creates a base64 encoded string to containing authorization information
func encodeAuth(authConfig *types.AuthConfig) string {
if authConfig.Username == "" && authConfig.Password == "" {
return ""
}
authStr := authConfig.Username + ":" + authConfig.Password
msg := []byte(authStr)
encoded := make([]byte, base64.StdEncoding.EncodedLen(len(msg)))
base64.StdEncoding.Encode(encoded, msg)
return string(encoded)
}
// decodeAuth decodes a base64 encoded string and returns username and password
func decodeAuth(authStr string) (string, string, error) {
if authStr == "" {
return "", "", nil
}
decLen := base64.StdEncoding.DecodedLen(len(authStr))
decoded := make([]byte, decLen)
authByte := []byte(authStr)
n, err := base64.StdEncoding.Decode(decoded, authByte)
if err != nil {
return "", "", err
}
if n > decLen {
return "", "", errors.Errorf("Something went wrong decoding auth config")
}
userName, password, ok := strings.Cut(string(decoded), ":")
if !ok || userName == "" {
return "", "", errors.Errorf("Invalid auth configuration file")
}
return userName, strings.Trim(password, "\x00"), nil
}
// GetCredentialsStore returns a new credentials store from the settings in the
// configuration file
func (configFile *ConfigFile) GetCredentialsStore(registryHostname string) credentials.Store {
if helper := getConfiguredCredentialStore(configFile, registryHostname); helper != "" {
return newNativeStore(configFile, helper)
}
return credentials.NewFileStore(configFile)
}
// var for unit testing.
var newNativeStore = func(configFile *ConfigFile, helperSuffix string) credentials.Store {
return credentials.NewNativeStore(configFile, helperSuffix)
}
// GetAuthConfig for a repository from the credential store
func (configFile *ConfigFile) GetAuthConfig(registryHostname string) (types.AuthConfig, error) {
return configFile.GetCredentialsStore(registryHostname).Get(registryHostname)
}
// getConfiguredCredentialStore returns the credential helper configured for the
// given registry, the default credsStore, or the empty string if neither are
// configured.
func getConfiguredCredentialStore(c *ConfigFile, registryHostname string) string {
if c.CredentialHelpers != nil && registryHostname != "" {
if helper, exists := c.CredentialHelpers[registryHostname]; exists {
return helper
}
}
return c.CredentialsStore
}
// GetAllCredentials returns all of the credentials stored in all of the
// configured credential stores.
func (configFile *ConfigFile) GetAllCredentials() (map[string]types.AuthConfig, error) {
auths := make(map[string]types.AuthConfig)
addAll := func(from map[string]types.AuthConfig) {
for reg, ac := range from {
auths[reg] = ac
}
}
defaultStore := configFile.GetCredentialsStore("")
newAuths, err := defaultStore.GetAll()
if err != nil {
return nil, err
}
addAll(newAuths)
// Auth configs from a registry-specific helper should override those from the default store.
for registryHostname := range configFile.CredentialHelpers {
newAuth, err := configFile.GetAuthConfig(registryHostname)
if err != nil {
logrus.WithError(err).Warnf("Failed to get credentials for registry: %s", registryHostname)
continue
}
auths[registryHostname] = newAuth
}
return auths, nil
}
// GetFilename returns the file name that this config file is based on.
func (configFile *ConfigFile) GetFilename() string {
return configFile.Filename
}
// PluginConfig retrieves the requested option for the given plugin.
func (configFile *ConfigFile) PluginConfig(pluginname, option string) (string, bool) {
if configFile.Plugins == nil {
return "", false
}
pluginConfig, ok := configFile.Plugins[pluginname]
if !ok {
return "", false
}
value, ok := pluginConfig[option]
return value, ok
}
// SetPluginConfig sets the option to the given value for the given
// plugin. Passing a value of "" will remove the option. If removing
// the final config item for a given plugin then also cleans up the
// overall plugin entry.
func (configFile *ConfigFile) SetPluginConfig(pluginname, option, value string) {
if configFile.Plugins == nil {
configFile.Plugins = make(map[string]map[string]string)
}
pluginConfig, ok := configFile.Plugins[pluginname]
if !ok {
pluginConfig = make(map[string]string)
configFile.Plugins[pluginname] = pluginConfig
}
if value != "" {
pluginConfig[option] = value
} else {
delete(pluginConfig, option)
}
if len(pluginConfig) == 0 {
delete(configFile.Plugins, pluginname)
}
}