traefik/vendor/k8s.io/client-go/tools/clientcmd/client_config.go
2018-01-11 17:46:04 +01:00

501 lines
20 KiB
Go

/*
Copyright 2014 The Kubernetes Authors.
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 clientcmd
import (
"fmt"
"io"
"io/ioutil"
"net/url"
"os"
"strings"
"github.com/golang/glog"
"github.com/imdario/mergo"
"strconv"
"time"
"k8s.io/client-go/pkg/api"
"k8s.io/client-go/rest"
clientauth "k8s.io/client-go/tools/auth"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
)
var (
// ClusterDefaults has the same behavior as the old EnvVar and DefaultCluster fields
// DEPRECATED will be replaced
ClusterDefaults = clientcmdapi.Cluster{Server: getDefaultServer()}
// DefaultClientConfig represents the legacy behavior of this package for defaulting
// DEPRECATED will be replace
DefaultClientConfig = DirectClientConfig{*clientcmdapi.NewConfig(), "", &ConfigOverrides{
ClusterDefaults: ClusterDefaults,
}, nil, NewDefaultClientConfigLoadingRules()}
)
// getDefaultServer returns a default setting for DefaultClientConfig
// DEPRECATED
func getDefaultServer() string {
if server := os.Getenv("KUBERNETES_MASTER"); len(server) > 0 {
return server
}
return "http://localhost:8080"
}
// ClientConfig is used to make it easy to get an api server client
type ClientConfig interface {
// RawConfig returns the merged result of all overrides
RawConfig() (clientcmdapi.Config, error)
// ClientConfig returns a complete client config
ClientConfig() (*rest.Config, error)
// Namespace returns the namespace resulting from the merged
// result of all overrides and a boolean indicating if it was
// overridden
Namespace() (string, bool, error)
// ConfigAccess returns the rules for loading/persisting the config.
ConfigAccess() ConfigAccess
}
type PersistAuthProviderConfigForUser func(user string) rest.AuthProviderConfigPersister
// DirectClientConfig is a ClientConfig interface that is backed by a clientcmdapi.Config, options overrides, and an optional fallbackReader for auth information
type DirectClientConfig struct {
config clientcmdapi.Config
contextName string
overrides *ConfigOverrides
fallbackReader io.Reader
configAccess ConfigAccess
}
// NewDefaultClientConfig creates a DirectClientConfig using the config.CurrentContext as the context name
func NewDefaultClientConfig(config clientcmdapi.Config, overrides *ConfigOverrides) ClientConfig {
return &DirectClientConfig{config, config.CurrentContext, overrides, nil, NewDefaultClientConfigLoadingRules()}
}
// NewNonInteractiveClientConfig creates a DirectClientConfig using the passed context name and does not have a fallback reader for auth information
func NewNonInteractiveClientConfig(config clientcmdapi.Config, contextName string, overrides *ConfigOverrides, configAccess ConfigAccess) ClientConfig {
return &DirectClientConfig{config, contextName, overrides, nil, configAccess}
}
// NewInteractiveClientConfig creates a DirectClientConfig using the passed context name and a reader in case auth information is not provided via files or flags
func NewInteractiveClientConfig(config clientcmdapi.Config, contextName string, overrides *ConfigOverrides, fallbackReader io.Reader, configAccess ConfigAccess) ClientConfig {
return &DirectClientConfig{config, contextName, overrides, fallbackReader, configAccess}
}
func (config *DirectClientConfig) RawConfig() (clientcmdapi.Config, error) {
return config.config, nil
}
// ClientConfig implements ClientConfig
func (config *DirectClientConfig) ClientConfig() (*rest.Config, error) {
// check that getAuthInfo, getContext, and getCluster do not return an error.
// Do this before checking if the curent config is usable in the event that an
// AuthInfo, Context, or Cluster config with user-defined names are not found.
// This provides a user with the immediate cause for error if one is found
configAuthInfo, err := config.getAuthInfo()
if err != nil {
return nil, err
}
_, err = config.getContext()
if err != nil {
return nil, err
}
configClusterInfo, err := config.getCluster()
if err != nil {
return nil, err
}
if err := config.ConfirmUsable(); err != nil {
return nil, err
}
clientConfig := &rest.Config{}
clientConfig.Host = configClusterInfo.Server
if len(config.overrides.Timeout) > 0 {
if i, err := strconv.ParseInt(config.overrides.Timeout, 10, 64); err == nil && i >= 0 {
clientConfig.Timeout = time.Duration(i) * time.Second
} else if requestTimeout, err := time.ParseDuration(config.overrides.Timeout); err == nil {
clientConfig.Timeout = requestTimeout
} else {
return nil, fmt.Errorf("Invalid value for option '--request-timeout'. Value must be a single integer, or an integer followed by a corresponding time unit (e.g. 1s | 2m | 3h)")
}
}
if u, err := url.ParseRequestURI(clientConfig.Host); err == nil && u.Opaque == "" && len(u.Path) > 1 {
u.RawQuery = ""
u.Fragment = ""
clientConfig.Host = u.String()
}
if len(configAuthInfo.Impersonate) > 0 {
clientConfig.Impersonate = configAuthInfo.Impersonate
}
// only try to read the auth information if we are secure
if rest.IsConfigTransportTLS(*clientConfig) {
var err error
// mergo is a first write wins for map value and a last writing wins for interface values
// NOTE: This behavior changed with https://github.com/imdario/mergo/commit/d304790b2ed594794496464fadd89d2bb266600a.
// Our mergo.Merge version is older than this change.
var persister rest.AuthProviderConfigPersister
if config.configAccess != nil {
authInfoName, _ := config.getAuthInfoName()
persister = PersisterForUser(config.configAccess, authInfoName)
}
userAuthPartialConfig, err := getUserIdentificationPartialConfig(configAuthInfo, config.fallbackReader, persister)
if err != nil {
return nil, err
}
mergo.Merge(clientConfig, userAuthPartialConfig)
serverAuthPartialConfig, err := getServerIdentificationPartialConfig(configAuthInfo, configClusterInfo)
if err != nil {
return nil, err
}
mergo.Merge(clientConfig, serverAuthPartialConfig)
}
return clientConfig, nil
}
// clientauth.Info object contain both user identification and server identification. We want different precedence orders for
// both, so we have to split the objects and merge them separately
// we want this order of precedence for the server identification
// 1. configClusterInfo (the final result of command line flags and merged .kubeconfig files)
// 2. configAuthInfo.auth-path (this file can contain information that conflicts with #1, and we want #1 to win the priority)
// 3. load the ~/.kubernetes_auth file as a default
func getServerIdentificationPartialConfig(configAuthInfo clientcmdapi.AuthInfo, configClusterInfo clientcmdapi.Cluster) (*rest.Config, error) {
mergedConfig := &rest.Config{}
// configClusterInfo holds the information identify the server provided by .kubeconfig
configClientConfig := &rest.Config{}
configClientConfig.CAFile = configClusterInfo.CertificateAuthority
configClientConfig.CAData = configClusterInfo.CertificateAuthorityData
configClientConfig.Insecure = configClusterInfo.InsecureSkipTLSVerify
mergo.Merge(mergedConfig, configClientConfig)
return mergedConfig, nil
}
// clientauth.Info object contain both user identification and server identification. We want different precedence orders for
// both, so we have to split the objects and merge them separately
// we want this order of precedence for user identifcation
// 1. configAuthInfo minus auth-path (the final result of command line flags and merged .kubeconfig files)
// 2. configAuthInfo.auth-path (this file can contain information that conflicts with #1, and we want #1 to win the priority)
// 3. if there is not enough information to idenfity the user, load try the ~/.kubernetes_auth file
// 4. if there is not enough information to identify the user, prompt if possible
func getUserIdentificationPartialConfig(configAuthInfo clientcmdapi.AuthInfo, fallbackReader io.Reader, persistAuthConfig rest.AuthProviderConfigPersister) (*rest.Config, error) {
mergedConfig := &rest.Config{}
// blindly overwrite existing values based on precedence
if len(configAuthInfo.Token) > 0 {
mergedConfig.BearerToken = configAuthInfo.Token
} else if len(configAuthInfo.TokenFile) > 0 {
tokenBytes, err := ioutil.ReadFile(configAuthInfo.TokenFile)
if err != nil {
return nil, err
}
mergedConfig.BearerToken = string(tokenBytes)
}
if len(configAuthInfo.Impersonate) > 0 {
mergedConfig.Impersonate = configAuthInfo.Impersonate
}
if len(configAuthInfo.ClientCertificate) > 0 || len(configAuthInfo.ClientCertificateData) > 0 {
mergedConfig.CertFile = configAuthInfo.ClientCertificate
mergedConfig.CertData = configAuthInfo.ClientCertificateData
mergedConfig.KeyFile = configAuthInfo.ClientKey
mergedConfig.KeyData = configAuthInfo.ClientKeyData
}
if len(configAuthInfo.Username) > 0 || len(configAuthInfo.Password) > 0 {
mergedConfig.Username = configAuthInfo.Username
mergedConfig.Password = configAuthInfo.Password
}
if configAuthInfo.AuthProvider != nil {
mergedConfig.AuthProvider = configAuthInfo.AuthProvider
mergedConfig.AuthConfigPersister = persistAuthConfig
}
// if there still isn't enough information to authenticate the user, try prompting
if !canIdentifyUser(*mergedConfig) && (fallbackReader != nil) {
prompter := NewPromptingAuthLoader(fallbackReader)
promptedAuthInfo, err := prompter.Prompt()
if err != nil {
return nil, err
}
promptedConfig := makeUserIdentificationConfig(*promptedAuthInfo)
previouslyMergedConfig := mergedConfig
mergedConfig = &rest.Config{}
mergo.Merge(mergedConfig, promptedConfig)
mergo.Merge(mergedConfig, previouslyMergedConfig)
}
return mergedConfig, nil
}
// makeUserIdentificationFieldsConfig returns a client.Config capable of being merged using mergo for only user identification information
func makeUserIdentificationConfig(info clientauth.Info) *rest.Config {
config := &rest.Config{}
config.Username = info.User
config.Password = info.Password
config.CertFile = info.CertFile
config.KeyFile = info.KeyFile
config.BearerToken = info.BearerToken
return config
}
// makeUserIdentificationFieldsConfig returns a client.Config capable of being merged using mergo for only server identification information
func makeServerIdentificationConfig(info clientauth.Info) rest.Config {
config := rest.Config{}
config.CAFile = info.CAFile
if info.Insecure != nil {
config.Insecure = *info.Insecure
}
return config
}
func canIdentifyUser(config rest.Config) bool {
return len(config.Username) > 0 ||
(len(config.CertFile) > 0 || len(config.CertData) > 0) ||
len(config.BearerToken) > 0 ||
config.AuthProvider != nil
}
// Namespace implements ClientConfig
func (config *DirectClientConfig) Namespace() (string, bool, error) {
if err := config.ConfirmUsable(); err != nil {
return "", false, err
}
configContext, err := config.getContext()
if err != nil {
return "", false, err
}
if len(configContext.Namespace) == 0 {
return api.NamespaceDefault, false, nil
}
overridden := false
if config.overrides != nil && config.overrides.Context.Namespace != "" {
overridden = true
}
return configContext.Namespace, overridden, nil
}
// ConfigAccess implements ClientConfig
func (config *DirectClientConfig) ConfigAccess() ConfigAccess {
return config.configAccess
}
// ConfirmUsable looks a particular context and determines if that particular part of the config is useable. There might still be errors in the config,
// but no errors in the sections requested or referenced. It does not return early so that it can find as many errors as possible.
func (config *DirectClientConfig) ConfirmUsable() error {
validationErrors := make([]error, 0)
var contextName string
if len(config.contextName) != 0 {
contextName = config.contextName
} else {
contextName = config.config.CurrentContext
}
if len(contextName) > 0 {
_, exists := config.config.Contexts[contextName]
if !exists {
validationErrors = append(validationErrors, &errContextNotFound{contextName})
}
}
authInfoName, _ := config.getAuthInfoName()
authInfo, _ := config.getAuthInfo()
validationErrors = append(validationErrors, validateAuthInfo(authInfoName, authInfo)...)
clusterName, _ := config.getClusterName()
cluster, _ := config.getCluster()
validationErrors = append(validationErrors, validateClusterInfo(clusterName, cluster)...)
// when direct client config is specified, and our only error is that no server is defined, we should
// return a standard "no config" error
if len(validationErrors) == 1 && validationErrors[0] == ErrEmptyCluster {
return newErrConfigurationInvalid([]error{ErrEmptyConfig})
}
return newErrConfigurationInvalid(validationErrors)
}
// getContextName returns the default, or user-set context name, and a boolean that indicates
// whether the default context name has been overwritten by a user-set flag, or left as its default value
func (config *DirectClientConfig) getContextName() (string, bool) {
if len(config.overrides.CurrentContext) != 0 {
return config.overrides.CurrentContext, true
}
if len(config.contextName) != 0 {
return config.contextName, false
}
return config.config.CurrentContext, false
}
// getAuthInfoName returns a string containing the current authinfo name for the current context,
// and a boolean indicating whether the default authInfo name is overwritten by a user-set flag, or
// left as its default value
func (config *DirectClientConfig) getAuthInfoName() (string, bool) {
if len(config.overrides.Context.AuthInfo) != 0 {
return config.overrides.Context.AuthInfo, true
}
context, _ := config.getContext()
return context.AuthInfo, false
}
// getClusterName returns a string containing the default, or user-set cluster name, and a boolean
// indicating whether the default clusterName has been overwritten by a user-set flag, or left as
// its default value
func (config *DirectClientConfig) getClusterName() (string, bool) {
if len(config.overrides.Context.Cluster) != 0 {
return config.overrides.Context.Cluster, true
}
context, _ := config.getContext()
return context.Cluster, false
}
// getContext returns the clientcmdapi.Context, or an error if a required context is not found.
func (config *DirectClientConfig) getContext() (clientcmdapi.Context, error) {
contexts := config.config.Contexts
contextName, required := config.getContextName()
var mergedContext clientcmdapi.Context
if configContext, exists := contexts[contextName]; exists {
mergo.Merge(&mergedContext, configContext)
} else if required {
return clientcmdapi.Context{}, fmt.Errorf("context %q does not exist", contextName)
}
mergo.Merge(&mergedContext, config.overrides.Context)
return mergedContext, nil
}
// getAuthInfo returns the clientcmdapi.AuthInfo, or an error if a required auth info is not found.
func (config *DirectClientConfig) getAuthInfo() (clientcmdapi.AuthInfo, error) {
authInfos := config.config.AuthInfos
authInfoName, required := config.getAuthInfoName()
var mergedAuthInfo clientcmdapi.AuthInfo
if configAuthInfo, exists := authInfos[authInfoName]; exists {
mergo.Merge(&mergedAuthInfo, configAuthInfo)
} else if required {
return clientcmdapi.AuthInfo{}, fmt.Errorf("auth info %q does not exist", authInfoName)
}
mergo.Merge(&mergedAuthInfo, config.overrides.AuthInfo)
return mergedAuthInfo, nil
}
// getCluster returns the clientcmdapi.Cluster, or an error if a required cluster is not found.
func (config *DirectClientConfig) getCluster() (clientcmdapi.Cluster, error) {
clusterInfos := config.config.Clusters
clusterInfoName, required := config.getClusterName()
var mergedClusterInfo clientcmdapi.Cluster
mergo.Merge(&mergedClusterInfo, config.overrides.ClusterDefaults)
if configClusterInfo, exists := clusterInfos[clusterInfoName]; exists {
mergo.Merge(&mergedClusterInfo, configClusterInfo)
} else if required {
return clientcmdapi.Cluster{}, fmt.Errorf("cluster %q does not exist", clusterInfoName)
}
mergo.Merge(&mergedClusterInfo, config.overrides.ClusterInfo)
// An override of --insecure-skip-tls-verify=true and no accompanying CA/CA data should clear already-set CA/CA data
// otherwise, a kubeconfig containing a CA reference would return an error that "CA and insecure-skip-tls-verify couldn't both be set"
caLen := len(config.overrides.ClusterInfo.CertificateAuthority)
caDataLen := len(config.overrides.ClusterInfo.CertificateAuthorityData)
if config.overrides.ClusterInfo.InsecureSkipTLSVerify && caLen == 0 && caDataLen == 0 {
mergedClusterInfo.CertificateAuthority = ""
mergedClusterInfo.CertificateAuthorityData = nil
}
return mergedClusterInfo, nil
}
// inClusterClientConfig makes a config that will work from within a kubernetes cluster container environment.
type inClusterClientConfig struct{}
var _ ClientConfig = inClusterClientConfig{}
func (inClusterClientConfig) RawConfig() (clientcmdapi.Config, error) {
return clientcmdapi.Config{}, fmt.Errorf("inCluster environment config doesn't support multiple clusters")
}
func (inClusterClientConfig) ClientConfig() (*rest.Config, error) {
return rest.InClusterConfig()
}
func (inClusterClientConfig) Namespace() (string, bool, error) {
// This way assumes you've set the POD_NAMESPACE environment variable using the downward API.
// This check has to be done first for backwards compatibility with the way InClusterConfig was originally set up
if ns := os.Getenv("POD_NAMESPACE"); ns != "" {
return ns, true, nil
}
// Fall back to the namespace associated with the service account token, if available
if data, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace"); err == nil {
if ns := strings.TrimSpace(string(data)); len(ns) > 0 {
return ns, true, nil
}
}
return "default", false, nil
}
func (inClusterClientConfig) ConfigAccess() ConfigAccess {
return NewDefaultClientConfigLoadingRules()
}
// Possible returns true if loading an inside-kubernetes-cluster is possible.
func (inClusterClientConfig) Possible() bool {
fi, err := os.Stat("/var/run/secrets/kubernetes.io/serviceaccount/token")
return os.Getenv("KUBERNETES_SERVICE_HOST") != "" &&
os.Getenv("KUBERNETES_SERVICE_PORT") != "" &&
err == nil && !fi.IsDir()
}
// BuildConfigFromFlags is a helper function that builds configs from a master
// url or a kubeconfig filepath. These are passed in as command line flags for cluster
// components. Warnings should reflect this usage. If neither masterUrl or kubeconfigPath
// are passed in we fallback to inClusterConfig. If inClusterConfig fails, we fallback
// to the default config.
func BuildConfigFromFlags(masterUrl, kubeconfigPath string) (*rest.Config, error) {
if kubeconfigPath == "" && masterUrl == "" {
glog.Warningf("Neither --kubeconfig nor --master was specified. Using the inClusterConfig. This might not work.")
kubeconfig, err := rest.InClusterConfig()
if err == nil {
return kubeconfig, nil
}
glog.Warning("error creating inClusterConfig, falling back to default config: ", err)
}
return NewNonInteractiveDeferredLoadingClientConfig(
&ClientConfigLoadingRules{ExplicitPath: kubeconfigPath},
&ConfigOverrides{ClusterInfo: clientcmdapi.Cluster{Server: masterUrl}}).ClientConfig()
}
// BuildConfigFromKubeconfigGetter is a helper function that builds configs from a master
// url and a kubeconfigGetter.
func BuildConfigFromKubeconfigGetter(masterUrl string, kubeconfigGetter KubeconfigGetter) (*rest.Config, error) {
// TODO: We do not need a DeferredLoader here. Refactor code and see if we can use DirectClientConfig here.
cc := NewNonInteractiveDeferredLoadingClientConfig(
&ClientConfigGetter{kubeconfigGetter: kubeconfigGetter},
&ConfigOverrides{ClusterInfo: clientcmdapi.Cluster{Server: masterUrl}})
return cc.ClientConfig()
}