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tokend.go
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tokend.go
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package identity
import (
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"os"
"path/filepath"
"sync/atomic"
"time"
"github.com/cenkalti/backoff"
"github.com/pkg/errors"
"github.com/yahoo/k8s-athenz-identity/pkg/log"
"github.com/yahoo/k8s-athenz-identity/pkg/util"
)
func Tokend(idConfig *IdentityConfig, stopChan <-chan struct{}) error {
if idConfig.TokenServerAddr == "" || idConfig.TargetDomainRoles == "" || idConfig.TokenType == "" {
log.Infof("Token provider is disabled with empty options: address[%s], roles[%s], token-type[%s]", idConfig.TokenServerAddr, idConfig.TargetDomainRoles, idConfig.TokenType)
return nil
}
// map[domain][role][RoleToken.TokenString]
var roleTokenCache = make(map[string]map[string](*atomic.Value))
// map[domain][role][AccessToken.TokenString]
var accessTokenCache = make(map[string]map[string](*atomic.Value))
var keyPem, certPem []byte
handler, err := InitIdentityHandler(idConfig)
if err != nil {
log.Errorf("Failed to initialize client for tokens: %s", err.Error())
return err
}
writeFiles := func() error {
w := util.NewWriter()
for domain, atdcache := range accessTokenCache {
for role, atrcache := range atdcache {
at := atrcache.Load().(*AccessToken).TokenString
log.Infof("[New Access Token] Domain: %s, Role: %s", domain, role)
outPath := filepath.Join(idConfig.TokenDir, domain+":role."+role+".accesstoken")
log.Debugf("Saving Access Token[%d bytes] at %s", len(at), outPath)
if err := w.AddBytes(outPath, 0644, []byte(at)); err != nil {
return errors.Wrap(err, "unable to save access token")
}
}
}
for domain, rtdcache := range roleTokenCache {
for role, rtrcache := range rtdcache {
rt := rtrcache.Load().(*RoleToken).TokenString
log.Infof("[New Role Token] Domain: %s, Role: %s", domain, role)
outPath := filepath.Join(idConfig.TokenDir, domain+":role."+role+".roletoken")
log.Debugf("Saving Role Token[%d bytes] at %s", len(rt), outPath)
if err := w.AddBytes(outPath, 0644, []byte(rt)); err != nil {
return errors.Wrap(err, "unable to save role token")
}
}
}
return w.Save()
}
// getExponentialBackoff will return a backoff config with first retry delay of 5s, and backoff retry
// until TOKEN_REFRESH_INTERVAL / 4
getExponentialBackoff := func() *backoff.ExponentialBackOff {
b := backoff.NewExponentialBackOff()
b.InitialInterval = 5 * time.Second
b.Multiplier = 2
b.MaxElapsedTime = idConfig.TokenRefresh / 4
return b
}
notifyOnErr := func(err error, backoffDelay time.Duration) {
log.Errorf("Failed to refresh tokens: %s. Retrying in %s", err.Error(), backoffDelay)
}
run := func() error {
log.Debugf("Attempting to load x509 certificate from local file to get tokens: key[%s], cert[%s]...", idConfig.KeyFile, idConfig.CertFile)
certPem, err = os.ReadFile(idConfig.CertFile)
if err != nil {
log.Warnf("Error while reading x509 certificate from local file[%s]: %s", idConfig.CertFile, err.Error())
}
keyPem, err = os.ReadFile(idConfig.KeyFile)
if err != nil {
log.Warnf("Error while reading x509 certificate key from local file[%s]: %s", idConfig.KeyFile, err.Error())
}
if len(certPem) == 0 || len(keyPem) == 0 {
log.Errorf("Failed to load x509 certificate from local file to get tokens: key size[%d]bytes, certificate size[%d]bytes", len(keyPem), len(certPem))
return nil
} else {
log.Debugf("Successfully loaded x509 certificate from local file to get tokens: key size[%d]bytes, certificate size[%d]bytes", len(keyPem), len(certPem))
}
log.Infof("Attempting to get tokens from identity provider: targets[%s]...", idConfig.TargetDomainRoles)
roleTokens, accessTokens, err := handler.GetToken(certPem, keyPem)
if err != nil {
log.Warnf("Error while requesting tokens: %s", err.Error())
return err
}
log.Debugf("Successfully received tokens from identity provider: roleTokens(%d), accessTokens(%d)", len(roleTokens), len(accessTokens))
for _, r := range roleTokens {
var rt atomic.Value
rt.Store(r)
if roleTokenCache[r.Domain] == nil {
roleTokenCache[r.Domain] = make(map[string](*atomic.Value))
}
roleTokenCache[r.Domain][r.Role] = &rt
}
for _, a := range accessTokens {
var at atomic.Value
at.Store(a)
if accessTokenCache[a.Domain] == nil {
accessTokenCache[a.Domain] = make(map[string](*atomic.Value))
}
accessTokenCache[a.Domain][a.Role] = &at
}
log.Infof("Successfully updated token cache: roleTokens(%d), accessTokens(%d)", len(roleTokens), len(accessTokens))
if idConfig.TokenDir != "" {
return writeFiles()
} else {
log.Debugf("Skipping to write token files to directory[%s]", idConfig.TokenDir)
return nil
}
}
tokenHandler := func(w http.ResponseWriter, r *http.Request) {
domainHeader := "X-Athenz-Domain"
roleHeader := "X-Athenz-Role"
domain := r.Header.Get(domainHeader)
role := r.Header.Get(roleHeader)
at, rt, errMsg, response := "", "", "", []byte("")
var err error
if domain == "" || role == "" {
errMsg = fmt.Sprintf("http headers not set: %s[%s] %s[%s].", domainHeader, domain, roleHeader, role)
}
switch idConfig.TokenType {
case "roletoken":
if roleTokenCache[domain] == nil {
errMsg = fmt.Sprintf("domain[%s] was not found in cache.", domain)
} else if roleTokenCache[domain][role] == nil {
errMsg = fmt.Sprintf("domain[%s] role[%s] was not found in cache.", domain, role)
}
case "accesstoken":
if accessTokenCache[domain] == nil {
errMsg = fmt.Sprintf("domain[%s] was not found in cache.", domain)
} else if accessTokenCache[domain][role] == nil {
errMsg = fmt.Sprintf("domain[%s] role[%s] was not found in cache.", domain, role)
}
case "roletoken+accesstoken":
if accessTokenCache[domain] == nil || roleTokenCache[domain] == nil {
errMsg = fmt.Sprintf("domain[%s] was not found in cache.", domain)
} else if accessTokenCache[domain][role] == nil || roleTokenCache[domain][role] == nil {
errMsg = fmt.Sprintf("domain[%s] role[%s] was not found in cache.", domain, role)
}
}
if err != nil || len(errMsg) > 0 {
response, err = json.Marshal(map[string]string{"error": errMsg})
if err != nil {
log.Warnf("Error while preparing json response with: message[%s], error[%v]", errMsg, err)
return
}
errMsg = fmt.Sprintf("error writing json response with: %s[%s] %s[%s] error[%s].", domainHeader, domain, roleHeader, role, errMsg)
log.Warnf(errMsg)
w.WriteHeader(http.StatusBadRequest)
io.WriteString(w, string(response))
return
}
switch idConfig.TokenType {
case "roletoken":
rt = roleTokenCache[domain][role].Load().(*RoleToken).TokenString
w.Header().Set(idConfig.RoleAuthHeader, rt)
response, err = json.Marshal(map[string]string{"roletoken": rt})
case "accesstoken":
at = accessTokenCache[domain][role].Load().(*AccessToken).TokenString
w.Header().Set("Authorization", "bearer "+at)
response, err = json.Marshal(map[string]string{"accesstoken": at})
case "roletoken+accesstoken":
at = accessTokenCache[domain][role].Load().(*AccessToken).TokenString
rt = roleTokenCache[domain][role].Load().(*RoleToken).TokenString
w.Header().Set("Authorization", "bearer "+at)
w.Header().Set(idConfig.RoleAuthHeader, rt)
response, err = json.Marshal(map[string]string{"accesstoken": at, "roletoken": rt})
}
if err != nil {
log.Warnf("Error while preparing json response with: message[%s], error[%v]", errMsg, err)
return
}
log.Debugf("Returning %s for domain[%s], role[%s]", idConfig.TokenType, domain, role)
io.WriteString(w, string(response))
}
go func() {
err = backoff.RetryNotify(run, getExponentialBackoff(), notifyOnErr)
if idConfig.Init {
if err != nil {
log.Errorf("Failed to get initial tokens after multiple retries: %s", err.Error())
}
log.Infof("Token provider is disabled for init mode: address[%s]", idConfig.TokenServerAddr)
return
}
httpServer := &http.Server{
Addr: idConfig.TokenServerAddr,
Handler: http.HandlerFunc(tokenHandler),
}
go func() {
log.Infof("Starting token provider[%s]", idConfig.TokenServerAddr)
if err := httpServer.ListenAndServe(); err != nil {
log.Errorf("Failed to start token provider: %s", err.Error())
}
}()
t := time.NewTicker(idConfig.TokenRefresh)
defer t.Stop()
for {
log.Infof("Refreshing tokens for roles[%v] in %s", idConfig.TargetDomainRoles, idConfig.TokenRefresh)
select {
case <-t.C:
err := backoff.RetryNotify(run, getExponentialBackoff(), notifyOnErr)
if err != nil {
log.Errorf("Failed to refresh tokens after multiple retries: %s", err.Error())
}
case <-stopChan:
ctx, _ := context.WithTimeout(context.Background(), 5*time.Second)
httpServer.SetKeepAlivesEnabled(false)
if err := httpServer.Shutdown(ctx); err != nil {
log.Errorf("Failed to shutdown token provider: %s", err.Error())
}
return
}
}
}()
return nil
}