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server.go
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server.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package remote
import (
"context"
"fmt"
"strconv"
"strings"
"sync"
"time"
"github.com/gardener/controller-manager-library/pkg/logger"
"github.com/gardener/controller-manager-library/pkg/resources"
"github.com/gardener/external-dns-management/pkg/dns/provider"
"github.com/gardener/external-dns-management/pkg/server/metrics"
"github.com/gardener/external-dns-management/pkg/server/remote/common"
"github.com/gardener/external-dns-management/pkg/server/remote/conversion"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/status"
)
type server struct {
lock sync.Mutex
serverID string
spinning time.Duration
logctx logger.LogContext
namespaceStates map[string]*namespaceState
tokenTTL time.Duration
tokenCleanupTicker *time.Ticker
common.UnimplementedRemoteProviderServer
}
func CreateServer(logctx logger.LogContext) (common.RemoteProviderServer, error) {
return newServer(logctx)
}
func newServer(logctx logger.LogContext) (*server, error) {
id, err := randonString(8)
if err != nil {
return nil, err
}
s := &server{
serverID: id,
spinning: 15 * time.Second,
logctx: logctx,
namespaceStates: map[string]*namespaceState{},
tokenTTL: 2 * time.Hour,
}
s.tokenCleanupTicker = time.NewTicker(s.tokenTTL)
go func() {
for range s.tokenCleanupTicker.C {
s.cleanupTokens()
}
}()
return s, nil
}
func (s *server) ProviderUpdatedEvent(logger logger.LogContext, objectName resources.ObjectName, annotations map[string]string, handler provider.LightDNSHandler) {
remoteAccess := false
if annotations != nil {
if remoteAccessAnnotation, ok := annotations[provider.AnnotationRemoteAccess]; ok {
remoteAccess, _ = strconv.ParseBool(remoteAccessAnnotation)
}
}
if !remoteAccess {
s.ProviderRemovedEvent(logger, objectName)
return
}
nsState := s.getNamespaceState(objectName.Namespace(), true)
if nsState.updateHandler(logger, objectName.Name(), handler) {
logger.Infof("added/updated for remote access")
}
}
func (s *server) getNamespaceState(ns string, createIfNeeded bool) *namespaceState {
s.lock.Lock()
defer s.lock.Unlock()
nsState := s.namespaceStates[ns]
if createIfNeeded {
if nsState == nil {
nsState = newNamespaceState(ns)
s.namespaceStates[ns] = nsState
}
return nsState
}
if nsState != nil && len(nsState.handlers) == 0 {
return nil
}
return nsState
}
func (s *server) ProviderRemovedEvent(logger logger.LogContext, objectName resources.ObjectName) {
nsState := s.getNamespaceState(objectName.Namespace(), false)
if nsState == nil {
return
}
if nsState.removeHandler(objectName.Name()) {
logger.Infof("removing provider from remote access")
}
}
type reportFunc func(err error)
func (s *server) checkAuth(token, requestType, zoneid string) (*namespaceState, logger.LogContext, reportFunc, int32, error) {
start := time.Now()
parts := strings.SplitN(token, "|", 2)
namespace := parts[0]
nsState := s.getNamespaceState(namespace, false)
if nsState == nil {
return nil, s.logctx, nil, 0, fmt.Errorf("namespace %s not found or no providers available", namespace)
}
clientID, version, err := nsState.getToken(token)
logctx := s.logctx.NewContext("namespace", nsState.name).NewContext("clientID", clientID)
if err != nil {
return nil, logctx, nil, 0, err
}
rf := func(err error) {
d := time.Since(start)
code := ""
if err != nil {
code = substr(err.Error(), 0, 40)
}
metrics.ReportRemoteAccessSeconds(namespace, clientID, requestType, zoneid, code, d)
}
metrics.ReportRemoteAccessRequests(namespace, clientID, requestType, zoneid)
return nsState, logctx, rf, version, nil
}
func (s *server) Login(ctx context.Context, request *common.LoginRequest) (*common.LoginResponse, error) {
commonName, err := s.checkNamespaceAuthorization(ctx, request.Namespace)
logctx := s.logctx.NewContext("namespace", request.Namespace).NewContext("clientID", request.CliendID)
if err != nil {
logctx.Warn("Login auth failed")
return nil, err
}
logctx.Infof("Login auth successful: %s", commonName)
nsState := s.getNamespaceState(request.Namespace, false)
if nsState == nil {
metrics.ReportRemoteAccessLogins(request.Namespace, request.CliendID, false)
logctx.Infof("namespace %s not found or no providers available", request.Namespace)
return nil, fmt.Errorf("namespace %s not found or no providers available", request.Namespace)
}
metrics.ReportRemoteAccessLogins(request.Namespace, request.CliendID, true)
rnd, err := randonString(16)
if err != nil {
return nil, fmt.Errorf("random failed: %w", err)
}
token := nsState.generateAndAddToken(s.tokenTTL, rnd, request.CliendID, s.serverID, request.ClientProtocolVersion)
return &common.LoginResponse{Token: token, ServerProtocolVersion: common.ProtocolVersion1}, nil
}
func (s *server) checkNamespaceAuthorization(ctx context.Context, namespace string) (string, error) {
p, ok := peer.FromContext(ctx)
if !ok {
return "", status.Error(codes.Unauthenticated, "no peer found")
}
tlsAuth, ok := p.AuthInfo.(credentials.TLSInfo)
if !ok {
return "", status.Error(codes.Unauthenticated, "unexpected peer transport credentials")
}
if len(tlsAuth.State.VerifiedChains) == 0 || len(tlsAuth.State.VerifiedChains[0]) == 0 {
return "", status.Error(codes.Unauthenticated, "could not verify peer certificate")
}
commonName := tlsAuth.State.VerifiedChains[0][0].Subject.CommonName
firstLabel := strings.SplitN(commonName, ".", 2)[0]
// Check subject common name against configured username
if firstLabel != "*" && firstLabel != namespace {
return commonName, status.Error(codes.Unauthenticated,
fmt.Sprintf("invalid subject common name %q: %q (first label) != %q (remote namespace)", commonName, firstLabel, namespace))
}
return commonName, nil
}
func (s *server) cleanupTokens() {
s.lock.Lock()
defer s.lock.Unlock()
count := 0
now := time.Now()
for _, nsState := range s.namespaceStates {
count += nsState.cleanupTokens(now)
}
s.logctx.Infof("token cleanup of %d outdated tokens", count)
}
func (s *server) GetZones(_ context.Context, request *common.GetZonesRequest) (*common.Zones, error) {
nsState, logctx, report, _, err := s.checkAuth(request.Token, "GetZones", "")
if err != nil {
logctx.Warn(err)
return nil, err
}
logctx.Info("GetZones")
res, err := s.getZones(nsState, logctx)
report(err)
return res, err
}
func (s *server) getZones(nsState *namespaceState, logctx logger.LogContext) (*common.Zones, error) {
zones, err := nsState.getAllZones(s.spinning)
if err != nil {
return nil, err
}
result := &common.Zones{}
for _, zone := range zones {
z := &common.Zone{
Id: zone.Id().ID,
ProviderType: zone.Id().ProviderType,
Key: zone.Key(),
Domain: zone.Domain(),
ForwardedDomain: zone.ForwardedDomains(),
PrivateZone: zone.IsPrivate(),
}
result.Zone = append(result.Zone, z)
}
logctx.Infof("GetZones: %d zones", len(result.Zone))
return result, nil
}
func (s *server) GetZoneState(_ context.Context, request *common.GetZoneStateRequest) (*common.ZoneState, error) {
nsState, logctx, report, version, err := s.checkAuth(request.Token, "GetZoneState", request.Zoneid)
if err != nil {
logctx.Warn(err)
return nil, err
}
logctx = logctx.NewContext("zoneid", request.Zoneid)
logctx.Info("GetZoneState")
res, err := s.getZoneState(nsState, logctx, request.Zoneid, version)
report(err)
return res, err
}
func (s *server) getZoneState(nsState *namespaceState, logctx logger.LogContext, zoneid string, version int32) (*common.ZoneState, error) {
hstate, zone, err := nsState.lockupZone(s.spinning, zoneid)
if err != nil {
return nil, err
}
if !hstate.lock.TryLockSpinning(s.spinning) {
logctx.Info("rejected - busy")
return nil, fmt.Errorf("busy")
}
defer hstate.lock.Unlock()
state, err := hstate.handler.GetZoneState(zone)
if err != nil {
return nil, err
}
result := &common.ZoneState{DnsSets: conversion.MarshalDNSSets(state.GetDNSSets(), version)}
logctx.Infof("GetZoneState: %d DNSSets", len(result.GetDnsSets()))
return result, nil
}
func (s *server) Execute(_ context.Context, request *common.ExecuteRequest) (*common.ExecuteResponse, error) {
nsState, logctx, report, _, err := s.checkAuth(request.Token, "Execute", request.Zoneid)
if err != nil {
logctx.Warn(err)
return nil, err
}
logctx = logctx.NewContext("zoneid", request.Zoneid)
logctx.Infof("Execute: %d changes", len(request.ChangeRequest))
res, err := s.execute(nsState, logctx, request.Zoneid, request.ChangeRequest)
report(err)
return res, err
}
func (s *server) execute(nsState *namespaceState, logctx logger.LogContext, zoneid string, changeRequests []*common.ChangeRequest) (*common.ExecuteResponse, error) {
hstate, zone, err := nsState.lockupZone(s.spinning, zoneid)
if err != nil {
return nil, err
}
if !hstate.lock.TryLockSpinning(s.spinning) {
logctx.Info("rejected - busy")
return nil, fmt.Errorf("busy")
}
defer hstate.lock.Unlock()
state, err := hstate.handler.GetZoneState(zone)
if err != nil {
return nil, err
}
memLogger := newMemoryLogger(logctx)
var requests []*provider.ChangeRequest
var responses []*common.ChangeResponse
for _, request := range changeRequests {
response := &common.ChangeResponse{}
responses = append(responses, response)
done := newDoneHandler(response)
req, err := conversion.UnmarshalChangeRequest(request, done)
if err != nil {
return nil, err
}
requests = append(requests, req)
}
err = hstate.handler.ExecuteRequests(memLogger, zone, state, requests)
return &common.ExecuteResponse{
ChangeResponse: responses,
LogMessage: memLogger.entries,
}, err
}
func newDoneHandler(response *common.ChangeResponse) provider.DoneHandler {
return &serverDoneHandler{response: response}
}
type serverDoneHandler struct {
response *common.ChangeResponse
}
func (dh *serverDoneHandler) Succeeded() {
dh.response.State = common.ChangeResponse_SUCCEEDED
}
func (dh *serverDoneHandler) SetInvalid(err error) {
dh.response.State = common.ChangeResponse_INVALID
dh.response.ErrorMessage = err.Error()
}
func (dh *serverDoneHandler) Failed(err error) {
dh.response.State = common.ChangeResponse_FAILED
dh.response.ErrorMessage = err.Error()
}
func (dh *serverDoneHandler) Throttled() {
dh.response.State = common.ChangeResponse_THROTTLED
}