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client_factory.go
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client_factory.go
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package kubernetes
import (
"context"
"crypto/md5"
"encoding/base64"
"errors"
"fmt"
"sync"
"time"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd/api"
kialiConfig "github.com/kiali/kiali/config"
"github.com/kiali/kiali/log"
"github.com/kiali/kiali/prometheus/internalmetrics"
)
// the cached factory - only one is ever created; once created it is cached here
var factory *clientFactory
// Ensures only one factory is created
var once sync.Once
// defaultExpirationTime set the default expired time of a client
const defaultExpirationTime = time.Minute * 15
// ClientFactory interface for the clientFactory object
type ClientFactory interface {
GetClient(authInfo *api.AuthInfo) (ClientInterface, error) // TODO: Make private
GetClients(authInfo *api.AuthInfo) (map[string]ClientInterface, error)
GetSAClient(cluster string) ClientInterface
GetSAClients() map[string]ClientInterface
GetSAHomeClusterClient() ClientInterface
}
// clientFactory used to generate per users clients
type clientFactory struct {
// baseRestConfig contains some of the base rest config to be used for all clients.
// Not all of the data in this base config is used - some will be overridden per client like token and host info.
baseRestConfig *rest.Config
// clientEntries contain user clients that are used to authenticate as logged in users.
// Keyed by hash code generated from auth data.
clientEntries map[string]map[string]ClientInterface // By token by cluster
// Name of the home cluster. This is the cluster where Kiali is deployed which is usually the
// "in cluster" config. This name comes from the istio cluster id.
homeCluster string
// mutex for when accessing the stored clients
mutex sync.RWMutex
// when a client is expired, a signal with its tokenHash will be sent to recycleChan
recycleChan chan string
// remoteClusterInfos contains information on all remote clusters taken from the remote cluster secrets, keyed on cluster name.
remoteClusterInfos map[string]RemoteClusterInfo
// maps cluster name to a kiali client for that cluster. The kiali client uses the
// kiali service account to access the cluster API.
saClientEntries map[string]ClientInterface
}
// GetClientFactory returns the client factory. Creates a new one if necessary
func GetClientFactory() (ClientFactory, error) {
var err error
once.Do(func() {
if factory != nil {
return
}
factory, err = getClientFactory(*kialiConfig.Get())
})
return factory, err
}
func getClientFactory(conf kialiConfig.Config) (*clientFactory, error) {
// Get the normal configuration
var config *rest.Config
config, err := getConfigForLocalCluster()
if err != nil {
return nil, err
}
// Create a new config based on what was gathered above but don't specify the bearer token to use
baseConfig := rest.Config{
Host: config.Host, // TODO: do we need this? remote cluster clients should ignore this
TLSClientConfig: config.TLSClientConfig,
QPS: conf.KubernetesConfig.QPS,
Burst: conf.KubernetesConfig.Burst,
}
return newClientFactory(&baseConfig)
}
// NewClientFactory creates a new client factory that can be transitory.
// Callers should close the ctx when done with the client factory.
// Does not set the global ClientFactory. You should probably use
// GetClientFactory instead of this method unless you temporaily need
// to create a client like when Kiali sets the cluster id.
func NewClientFactory(ctx context.Context, conf kialiConfig.Config) (ClientFactory, error) {
cf, err := getClientFactory(conf)
if err != nil {
return nil, err
}
// Need to cleanup the recycle chan since this client factory could be transitory.
go func() {
<-ctx.Done()
log.Debug("Stopping client factory recycle chan")
close(cf.recycleChan)
}()
return cf, nil
}
// newClientFactory allows for specifying the config and expiry duration
// Mock friendly for testing purposes
func newClientFactory(restConfig *rest.Config) (*clientFactory, error) {
f := &clientFactory{
baseRestConfig: restConfig,
clientEntries: make(map[string]map[string]ClientInterface),
recycleChan: make(chan string),
saClientEntries: make(map[string]ClientInterface),
homeCluster: kialiConfig.Get().KubernetesConfig.ClusterName,
}
// after creating a client factory
// background goroutines will be watching the clients` expiration
// if a client is expired, it will be removed from clientEntries
go f.watchClients()
// obtain details on all known remote clusters
remoteClusterInfos, err := GetRemoteClusterInfos()
if err != nil {
return nil, err
}
f.remoteClusterInfos = remoteClusterInfos
// Create serivce account clients for the home cluster and each remote cluster.
// Note that this means each remote cluster secret token must be given the proper permissions
// in that remote cluster for Kiali to do its work. i.e. logging into a remote cluster with the
// remote cluster secret token must be given the same permissions as the local cluster Kiali SA.
homeClient, err := f.newSAClient(nil)
if err != nil {
return nil, fmt.Errorf("unable to create home cluster Kiali Service Account client. Err: %s", err)
}
f.saClientEntries[f.homeCluster] = homeClient
for cluster, clusterInfo := range remoteClusterInfos {
client, err := f.newSAClient(&clusterInfo)
if err != nil {
return nil, fmt.Errorf("unable to create remote Kiali Service Account client. Err: %s", err)
}
f.saClientEntries[cluster] = client
}
return f, nil
}
// newClient creates a new ClientInterface based on a users k8s token. It is assumed users do not have a token file in authInfo.
func (cf *clientFactory) newClient(authInfo *api.AuthInfo, expirationTime time.Duration, cluster string) (ClientInterface, error) {
config := *cf.baseRestConfig
config.BearerToken = authInfo.Token
config.BearerTokenFile = ""
// There is a feature when using OpenID strategy to allow using a proxy
// for the cluster API. People may want to place a proxy in
// front of the cluster API when using Kubernetes-as-a-service and
// the provider does not support configuring OpenID integration.
// If OpenID integration is not available, people may opt into
// an API proxy (like kube-oidc-proxy) as a workaround for OIDC integration.
// Clearly, under this scenario, the cluster API must be accessed
// through the proxy (not directly).
//
// So, if OpenID strategy is active, check if a proxy is configured.
// If there is, use it UNLESS the token is the one of the Kiali SA. If
// the token is the one of the Kiali SA, the proxy can be bypassed.
cfg := kialiConfig.Get()
if cfg.Auth.Strategy == kialiConfig.AuthStrategyOpenId && cfg.Auth.OpenId.ApiProxy != "" && cfg.Auth.OpenId.ApiProxyCAData != "" {
var kialiToken string
var err error
if cluster == cf.homeCluster {
kialiToken, _, err = GetKialiTokenForHomeCluster()
} else {
kialiToken, err = cf.GetSAClient(cluster).GetToken(), nil
}
if err != nil {
return nil, err
}
// User token and not Kiali SA token so use the proxy.
if kialiToken != authInfo.Token {
// Override the CA data on the client with the proxy CA from the Kiali config.
caData := cfg.Auth.OpenId.ApiProxyCAData
rootCaDecoded, err := base64.StdEncoding.DecodeString(caData)
if err != nil {
return nil, err
}
config.TLSClientConfig = rest.TLSClientConfig{
CAData: []byte(rootCaDecoded),
}
config.Host = cfg.Auth.OpenId.ApiProxy
}
}
// Impersonation is valid only for header authentication strategy
if cfg.Auth.Strategy == kialiConfig.AuthStrategyHeader && authInfo.Impersonate != "" {
config.Impersonate.UserName = authInfo.Impersonate
config.Impersonate.Groups = authInfo.ImpersonateGroups
config.Impersonate.Extra = authInfo.ImpersonateUserExtra
}
var newClient ClientInterface
if cluster == cf.homeCluster {
client, err := newClientWithRemoteClusterInfo(&config, nil)
if err != nil {
log.Errorf("Error creating client for cluster %s: %s", cluster, err.Error())
return nil, err
}
newClient = client
} else {
// Remote clusters
clusterInfos, err := GetRemoteClusterInfos()
if err != nil {
log.Errorf("Error getting remote cluster infos: %c", err)
return nil, err
}
clusterInfo, ok := clusterInfos[cluster]
if !ok {
return nil, fmt.Errorf("unable to find cluster [%s] in remote cluster info", cluster)
}
remoteConfig, err := cf.getConfig(&clusterInfo)
if err != nil {
log.Errorf("Error getting remote cluster [%s] info: %s", cluster, err)
return nil, err
}
// Replace the Kiali SA token with the user's auth token.
// Only if we are not in an anonymous mode
// and if we don't use OpenID with RBAC is disable.
if !(cfg.Auth.Strategy == kialiConfig.AuthStrategyAnonymous) &&
!(cfg.Auth.Strategy == kialiConfig.AuthStrategyOpenId && cfg.Auth.OpenId.DisableRBAC) {
remoteConfig.BearerToken = authInfo.Token
remoteConfig.BearerTokenFile = ""
}
newClient, err = newClientWithRemoteClusterInfo(remoteConfig, &clusterInfo)
if err != nil {
log.Errorf("Error getting remote client for cluster [%s]. Err: %s", cluster, err.Error())
return nil, err
}
}
// run to recycle client
go func(token string) {
<-time.After(expirationTime)
cf.recycleChan <- token
}(getTokenHash(authInfo))
return newClient, nil
}
// newSAClient returns a new client for the given cluster. If clusterInfo is nil then a client for the local cluster is returned.
func (cf *clientFactory) newSAClient(remoteClusterInfo *RemoteClusterInfo) (*K8SClient, error) {
log.Debug("Creating new Kiali Service Account client")
// if no cluster info is provided, we are being asked to create a new client for the home cluster
config, err := cf.getConfig(remoteClusterInfo)
if err != nil {
return nil, err
}
client, err := newClientWithRemoteClusterInfo(config, remoteClusterInfo)
if err != nil {
return nil, err
}
return client, nil
}
// getClient returns a client for the specified token. Creating one if necessary.
func (cf *clientFactory) GetSAClients() map[string]ClientInterface {
cf.mutex.RLock()
defer cf.mutex.RUnlock()
return cf.saClientEntries
}
// getClient returns a client for the specified token. Creating one if necessary.
func (cf *clientFactory) GetClient(authInfo *api.AuthInfo) (ClientInterface, error) {
return cf.getRecycleClient(authInfo, defaultExpirationTime, cf.homeCluster)
}
// getClient returns a client for the specified token. Creating one if necessary.
func (cf *clientFactory) GetClients(authInfo *api.AuthInfo) (map[string]ClientInterface, error) {
clients := make(map[string]ClientInterface)
// Try to create a user client for each cluster there's a kiali service account configured.
for cluster := range cf.saClientEntries {
ci, err := cf.getRecycleClient(authInfo, defaultExpirationTime, cluster)
if err != nil {
log.Errorf("Error returning user client for cluster: %s. Err: %s", cluster, err)
}
clients[cluster] = ci
}
if len(clients) == 0 {
return nil, errors.New("unable to create any user clients")
}
return clients, nil
}
// getRecycleClient returns a client for the specified token with expirationTime. Creating one if necessary.
func (cf *clientFactory) getRecycleClient(authInfo *api.AuthInfo, expirationTime time.Duration, cluster string) (ClientInterface, error) {
cf.mutex.Lock()
defer cf.mutex.Unlock()
tokenHash := getTokenHash(authInfo)
if cEntry, ok := cf.clientEntries[tokenHash][cluster]; ok {
return cEntry, nil
} else {
client, err := cf.newClient(authInfo, expirationTime, cluster)
if err != nil {
log.Errorf("Error fetching the Kubernetes client: %v", err)
return nil, err
}
if cf.clientEntries[tokenHash] == nil {
cf.clientEntries[tokenHash] = make(map[string]ClientInterface)
}
cf.clientEntries[tokenHash][cluster] = client
internalmetrics.SetKubernetesClients(len(cf.clientEntries))
return client, nil
}
}
// hasClient check if clientFactory has a client, return the client if clientFactory has it
// This is a helper function for testing.
// It uses the shared lock so beware of nested locking with other methods.
func (cf *clientFactory) hasClient(authInfo *api.AuthInfo) (map[string]ClientInterface, bool) {
tokenHash := getTokenHash(authInfo)
cf.mutex.RLock()
cEntry, ok := cf.clientEntries[tokenHash]
defer cf.mutex.RUnlock()
return cEntry, ok
}
// getClientsLength returns the length of clients.
// This is a helper function for testing.
// It uses the shared lock so beware of nested locking with other methods.
func (cf *clientFactory) getClientsLength() int {
cf.mutex.RLock()
defer cf.mutex.RUnlock()
return len(cf.clientEntries)
}
// watchClients listen signal from recycleChan and clean the expired clients
func (cf *clientFactory) watchClients() {
for {
// listen signal from recycleChan
tokenHash, ok := <-cf.recycleChan
if !ok {
log.Debug("recycleChan closed when watching clients")
return
}
// clean expired client with its token hash
cf.deleteClient(tokenHash)
}
}
func (cf *clientFactory) deleteClient(token string) {
cf.mutex.Lock()
defer cf.mutex.Unlock()
delete(cf.clientEntries, token)
internalmetrics.SetKubernetesClients(len(cf.clientEntries)) // TODO: + 2 dimmension map?
}
// getTokenHash get the token hash of a client
func getTokenHash(authInfo *api.AuthInfo) string {
tokenData := authInfo.Token
if authInfo.Impersonate != "" {
tokenData += authInfo.Impersonate
}
if authInfo.ImpersonateGroups != nil {
for _, group := range authInfo.ImpersonateGroups {
tokenData += group
}
}
if authInfo.ImpersonateUserExtra != nil {
for key, element := range authInfo.ImpersonateUserExtra {
for _, userExtra := range element {
tokenData += key + userExtra
}
}
}
h := md5.New()
_, err := h.Write([]byte(tokenData))
if err != nil {
// errcheck linter want us to check for the error returned by h.Write.
// However, docs of md5 say that this Writer never returns an error.
// See: https://golang.org/pkg/hash/#Hash
// So, let's check the error, and panic. Per the docs, this panic should
// never be reached.
panic("md5.Write returned error.")
}
return string(h.Sum(nil))
}
// KialiSAClients returns all clients associated with the Kiali service account across clusters.
func (cf *clientFactory) GetSAClient(cluster string) ClientInterface {
cf.mutex.RLock()
defer cf.mutex.RUnlock()
return cf.saClientEntries[cluster]
}
// KialiSAHomeClusterClient returns the Kiali service account client for the cluster where Kiali is running.
func (cf *clientFactory) GetSAHomeClusterClient() ClientInterface {
return cf.GetSAClient(cf.homeCluster)
}
func (cf *clientFactory) getConfig(clusterInfo *RemoteClusterInfo) (*rest.Config, error) {
kialiConfig := kialiConfig.Get()
clientConfig := *cf.baseRestConfig
// Remote Cluster
if clusterInfo != nil {
remoteConfig, err := clusterInfo.Config.ClientConfig()
if err != nil {
return nil, err
}
// Use the remote config entirely for remote clusters.
clientConfig = *remoteConfig
} else {
// Just read the token and then use the base config.
// We're an in cluster client. Read the kiali service account token.
kialiToken, kialiTokenFile, err := GetKialiTokenForHomeCluster()
if err != nil {
return nil, fmt.Errorf("unable to get Kiali service account token: %s", err)
}
// Copy over the base rest config and the token
clientConfig.BearerToken = kialiToken
clientConfig.BearerTokenFile = kialiTokenFile
}
if !kialiConfig.KialiFeatureFlags.Clustering.EnableExecProvider {
clientConfig.ExecProvider = nil
}
// Override some settings with what's in kiali config
clientConfig.QPS = kialiConfig.KubernetesConfig.QPS
clientConfig.Burst = kialiConfig.KubernetesConfig.Burst
return &clientConfig, nil
}