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Reorganize some CA manager code for correctness/readability

This commit is contained in:
Kyle Havlovitz 2020-11-13 14:33:19 -08:00
parent 6fba82a4fa
commit 16e95f1d7b
4 changed files with 408 additions and 376 deletions
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227
agent/consul/connect_ca_endpoint.go
View File

@ -3,14 +3,12 @@ package consul
import (
"errors"
"fmt"
"reflect"
"time"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/consul/acl"
"github.com/hashicorp/consul/agent/connect"
"github.com/hashicorp/consul/agent/connect/ca"
"github.com/hashicorp/consul/agent/consul/state"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/go-memdb"
@ -103,230 +101,7 @@ func (s *ConnectCA) ConfigurationSet(
return acl.ErrPermissionDenied
}
// Exit early if it's a no-op change
state := s.srv.fsm.State()
confIdx, config, err := state.CAConfig(nil)
if err != nil {
return err
}
// Don't allow state changes. Either it needs to be empty or the same to allow
// read-modify-write loops that don't touch the State field.
if len(args.Config.State) > 0 &&
!reflect.DeepEqual(args.Config.State, config.State) {
return ErrStateReadOnly
}
// Don't allow users to change the ClusterID.
args.Config.ClusterID = config.ClusterID
if args.Config.Provider == config.Provider && reflect.DeepEqual(args.Config.Config, config.Config) {
return nil
}
// If the provider hasn't changed, we need to load the current Provider state
// so it can decide if it needs to change resources or not based on the config
// change.
if args.Config.Provider == config.Provider {
// Note this is a shallow copy since the State method doc requires the
// provider return a map that will not be further modified and should not
// modify the one we pass to Configure.
args.Config.State = config.State
}
// Create a new instance of the provider described by the config
// and get the current active root CA. This acts as a good validation
// of the config and makes sure the provider is functioning correctly
// before we commit any changes to Raft.
newProvider, err := s.srv.createCAProvider(args.Config)
if err != nil {
return fmt.Errorf("could not initialize provider: %v", err)
}
pCfg := ca.ProviderConfig{
ClusterID: args.Config.ClusterID,
Datacenter: s.srv.config.Datacenter,
// This endpoint can be called in a secondary DC too so set this correctly.
IsPrimary: s.srv.config.Datacenter == s.srv.config.PrimaryDatacenter,
RawConfig: args.Config.Config,
State: args.Config.State,
}
if err := newProvider.Configure(pCfg); err != nil {
return fmt.Errorf("error configuring provider: %v", err)
}
// Set up a defer to clean up the new provider if we exit early due to an error.
cleanupNewProvider := true
defer func() {
if cleanupNewProvider {
if err := newProvider.Cleanup(); err != nil {
s.logger.Warn("failed to clean up CA provider while handling startup failure", "provider", newProvider, "error", err)
}
}
}()
// If this is a secondary, check if the intermediate needs to be regenerated.
if s.srv.config.Datacenter != s.srv.config.PrimaryDatacenter {
// Attempt to take the CA lock in order to update the config.
if err := s.srv.caManager.setState(CAStateReconfig); err != nil {
return err
}
defer s.srv.caManager.setReady()
if err := s.srv.caManager.initializeSecondaryCA(newProvider, args.Config); err != nil {
return fmt.Errorf("Error updating secondary datacenter CA config: %v", err)
}
cleanupNewProvider = false
s.logger.Info("Secondary CA provider config updated")
return nil
}
if err := newProvider.GenerateRoot(); err != nil {
return fmt.Errorf("error generating CA root certificate: %v", err)
}
newRootPEM, err := newProvider.ActiveRoot()
if err != nil {
return err
}
newActiveRoot, err := parseCARoot(newRootPEM, args.Config.Provider, args.Config.ClusterID)
if err != nil {
return err
}
// See if the provider needs to persist any state along with the config
pState, err := newProvider.State()
if err != nil {
return fmt.Errorf("error getting provider state: %v", err)
}
args.Config.State = pState
// Compare the new provider's root CA ID to the current one. If they
// match, just update the existing provider with the new config.
// If they don't match, begin the root rotation process.
_, root, err := state.CARootActive(nil)
if err != nil {
return err
}
// If the root didn't change, just update the config and return.
if root != nil && root.ID == newActiveRoot.ID {
args.Op = structs.CAOpSetConfig
resp, err := s.srv.raftApply(structs.ConnectCARequestType, args)
if err != nil {
return err
}
if respErr, ok := resp.(error); ok {
return respErr
}
// If the config has been committed, update the local provider instance
cleanupNewProvider = false
s.srv.caManager.setCAProvider(newProvider, newActiveRoot)
s.logger.Info("CA provider config updated")
return nil
}
// At this point, we know the config change has trigged a root rotation,
// either by swapping the provider type or changing the provider's config
// to use a different root certificate.
// First up, sanity check that the current provider actually supports
// cross-signing.
oldProvider, _ := s.srv.caManager.getCAProvider()
if oldProvider == nil {
return fmt.Errorf("internal error: CA provider is nil")
}
canXSign, err := oldProvider.SupportsCrossSigning()
if err != nil {
return fmt.Errorf("CA provider error: %s", err)
}
if !canXSign && !args.Config.ForceWithoutCrossSigning {
return errors.New("The current CA Provider does not support cross-signing. " +
"You can try again with ForceWithoutCrossSigningSet but this may cause " +
"disruption - see documentation for more.")
}
if !canXSign && args.Config.ForceWithoutCrossSigning {
s.logger.Warn("current CA doesn't support cross signing but " +
"CA reconfiguration forced anyway with ForceWithoutCrossSigning")
}
// If it's a config change that would trigger a rotation (different provider/root):
// 1. Get the root from the new provider.
// 2. Call CrossSignCA on the old provider to sign the new root with the old one to
// get a cross-signed certificate.
// 3. Take the active root for the new provider and append the intermediate from step 2
// to its list of intermediates.
newRoot, err := connect.ParseCert(newRootPEM)
if err != nil {
return err
}
if canXSign {
// Have the old provider cross-sign the new root
xcCert, err := oldProvider.CrossSignCA(newRoot)
if err != nil {
return err
}
// Add the cross signed cert to the new CA's intermediates (to be attached
// to leaf certs).
newActiveRoot.IntermediateCerts = []string{xcCert}
}
intermediate, err := newProvider.GenerateIntermediate()
if err != nil {
return err
}
if intermediate != newRootPEM {
newActiveRoot.IntermediateCerts = append(newActiveRoot.IntermediateCerts, intermediate)
}
// Update the roots and CA config in the state store at the same time
idx, roots, err := state.CARoots(nil)
if err != nil {
return err
}
var newRoots structs.CARoots
for _, r := range roots {
newRoot := *r
if newRoot.Active {
newRoot.Active = false
newRoot.RotatedOutAt = time.Now()
}
newRoots = append(newRoots, &newRoot)
}
newRoots = append(newRoots, newActiveRoot)
args.Op = structs.CAOpSetRootsAndConfig
args.Index = idx
args.Config.ModifyIndex = confIdx
args.Roots = newRoots
resp, err := s.srv.raftApply(structs.ConnectCARequestType, args)
if err != nil {
return err
}
if respErr, ok := resp.(error); ok {
return respErr
}
if respOk, ok := resp.(bool); ok && !respOk {
return fmt.Errorf("could not atomically update roots and config")
}
// If the config has been committed, update the local provider instance
// and call teardown on the old provider
cleanupNewProvider = false
s.srv.caManager.setCAProvider(newProvider, newActiveRoot)
if err := oldProvider.Cleanup(); err != nil {
s.logger.Warn("failed to clean up old provider", "provider", config.Provider)
}
s.logger.Info("CA rotated to new root under provider", "provider", args.Config.Provider)
return nil
return s.srv.caManager.UpdateConfiguration(args)
}
// Roots returns the currently trusted root certificates.

3
agent/consul/leader.go
View File

@ -327,8 +327,7 @@ func (s *Server) establishLeadership(ctx context.Context) error {
s.getOrCreateAutopilotConfig()
s.autopilot.Start(ctx)
// todo(kyhavlov): start a goroutine here for handling periodic CA rotation
if err := s.caManager.initializeCA(); err != nil {
if err := s.caManager.InitializeCA(); err != nil {
return err
}

551
agent/consul/leader_connect_ca.go
View File

@ -2,6 +2,7 @@ package consul
import (
"context"
"errors"
"fmt"
"reflect"
"strings"
@ -33,25 +34,21 @@ type CAManager struct {
srv *Server
logger hclog.Logger
providerLock sync.RWMutex
// provider is the current CA provider in use for Connect. This is
// only non-nil when we are the leader.
provider ca.Provider
// providerRoot is the CARoot that was stored along with the ca.Provider
// active. It's only updated in lock-step with the provider. This prevents
// races between state updates to active roots and the fetch of the provider
// instance.
providerRoot *structs.CARoot
providerLock sync.RWMutex
// primaryRoots is the most recently seen state of the root CAs from the primary datacenter.
// This is protected by the stateLock and updated by initializeCA and the root CA watch routine.
primaryRoots structs.IndexedCARoots
// actingSecondaryCA is whether this datacenter has been initialized as a secondary CA.
actingSecondaryCA bool
// stateLock protects the internal state used for administrative CA tasks.
stateLock sync.Mutex
state CAState
stateLock sync.RWMutex
primaryRoots structs.IndexedCARoots // The most recently seen state of the root CAs from the primary datacenter.
actingSecondaryCA bool // True if this datacenter has been initialized as a secondary CA.
}
func NewCAManager(srv *Server) *CAManager {
@ -65,27 +62,36 @@ func NewCAManager(srv *Server) *CAManager {
// setState attempts to update the CA state to the given state.
// If the current state is not READY, this will fail. The only exception is when
// the current state is UNINITIALIZED, and the function is called with CAStateInitializing.
func (c *CAManager) setState(newState CAState) error {
c.stateLock.RLock()
func (c *CAManager) setState(newState CAState, validateState bool) error {
c.stateLock.Lock()
defer c.stateLock.Unlock()
state := c.state
c.stateLock.RUnlock()
if state == CAStateReady || (state == CAStateUninitialized && newState == CAStateInitializing) {
c.stateLock.Lock()
if !validateState || state == CAStateReady || (state == CAStateUninitialized && newState == CAStateInitializing) {
c.state = newState
c.stateLock.Unlock()
} else {
return fmt.Errorf("CA is already in %s state", state)
return fmt.Errorf("CA is already in state %q", state)
}
return nil
}
// setReady sets the CA state back to READY. This should only be called by a function
// that has successfully called setState beforehand.
func (c *CAManager) setReady() {
// setPrimaryRoots updates the most recently seen roots from the primary.
func (c *CAManager) setPrimaryRoots(newRoots structs.IndexedCARoots) error {
c.stateLock.Lock()
c.state = CAStateReady
c.stateLock.Unlock()
defer c.stateLock.Unlock()
if c.state == CAStateInitializing || c.state == CAStateReconfig {
c.primaryRoots = newRoots
} else {
return fmt.Errorf("Cannot update primary roots in state %q", c.state)
}
return nil
}
func (c *CAManager) getPrimaryRoots() structs.IndexedCARoots {
c.stateLock.Lock()
defer c.stateLock.Unlock()
return c.primaryRoots
}
// initializeCAConfig is used to initialize the CA config if necessary
@ -196,20 +202,21 @@ func (c *CAManager) setCAProvider(newProvider ca.Provider, root *structs.CARoot)
c.providerLock.Unlock()
}
// initializeCA sets up the CA provider when gaining leadership, either bootstrapping
// InitializeCA sets up the CA provider when gaining leadership, either bootstrapping
// the CA if this is the primary DC or making a remote RPC for intermediate signing
// if this is a secondary DC.
func (c *CAManager) initializeCA() error {
func (c *CAManager) InitializeCA() error {
// Bail if connect isn't enabled.
if !c.srv.config.ConnectEnabled {
return nil
}
err := c.setState(CAStateInitializing)
// Update the state before doing anything else.
err := c.setState(CAStateInitializing, true)
if err != nil {
return err
}
defer c.setReady()
defer c.setState(CAStateReady, false)
// Initialize the provider based on the current config.
conf, err := c.initializeCAConfig()
@ -246,7 +253,9 @@ func (c *CAManager) initializeCA() error {
if err := c.srv.forwardDC("ConnectCA.Roots", c.srv.config.PrimaryDatacenter, &args, &roots); err != nil {
return err
}
c.primaryRoots = roots
if err := c.setPrimaryRoots(roots); err != nil {
return err
}
// Configure the CA provider and initialize the intermediate certificate if necessary.
if err := c.initializeSecondaryProvider(provider, roots); err != nil {
@ -428,8 +437,9 @@ func (c *CAManager) initializeSecondaryCA(provider ca.Provider, config *structs.
// active one. We'll use this as a template to generate any new root
// representations meant for this secondary.
var newActiveRoot *structs.CARoot
for _, root := range c.primaryRoots.Roots {
if root.ID == c.primaryRoots.ActiveRootID && root.Active {
primaryRoots := c.getPrimaryRoots()
for _, root := range primaryRoots.Roots {
if root.ID == primaryRoots.ActiveRootID && root.Active {
newActiveRoot = root
break
}
@ -441,7 +451,7 @@ func (c *CAManager) initializeSecondaryCA(provider ca.Provider, config *structs.
// Get a signed intermediate from the primary DC if the provider
// hasn't been initialized yet or if the primary's root has changed.
needsNewIntermediate := false
if activeIntermediate == "" || storedRootID != c.primaryRoots.ActiveRootID {
if activeIntermediate == "" || storedRootID != primaryRoots.ActiveRootID {
needsNewIntermediate = true
}
@ -559,6 +569,233 @@ func (c *CAManager) persistNewRootAndConfig(provider ca.Provider, newActiveRoot
return nil
}
func (c *CAManager) UpdateConfiguration(args *structs.CARequest) error {
// Attempt to update the state first.
if err := c.setState(CAStateReconfig, true); err != nil {
return err
}
defer c.setState(CAStateReady, false)
// Exit early if it's a no-op change
state := c.srv.fsm.State()
confIdx, config, err := state.CAConfig(nil)
if err != nil {
return err
}
// Don't allow state changes. Either it needs to be empty or the same to allow
// read-modify-write loops that don't touch the State field.
if len(args.Config.State) > 0 &&
!reflect.DeepEqual(args.Config.State, config.State) {
return ErrStateReadOnly
}
// Don't allow users to change the ClusterID.
args.Config.ClusterID = config.ClusterID
if args.Config.Provider == config.Provider && reflect.DeepEqual(args.Config.Config, config.Config) {
return nil
}
// If the provider hasn't changed, we need to load the current Provider state
// so it can decide if it needs to change resources or not based on the config
// change.
if args.Config.Provider == config.Provider {
// Note this is a shallow copy since the State method doc requires the
// provider return a map that will not be further modified and should not
// modify the one we pass to Configure.
args.Config.State = config.State
}
// Create a new instance of the provider described by the config
// and get the current active root CA. This acts as a good validation
// of the config and makes sure the provider is functioning correctly
// before we commit any changes to Raft.
newProvider, err := c.srv.createCAProvider(args.Config)
if err != nil {
return fmt.Errorf("could not initialize provider: %v", err)
}
pCfg := ca.ProviderConfig{
ClusterID: args.Config.ClusterID,
Datacenter: c.srv.config.Datacenter,
// This endpoint can be called in a secondary DC too so set this correctly.
IsPrimary: c.srv.config.Datacenter == c.srv.config.PrimaryDatacenter,
RawConfig: args.Config.Config,
State: args.Config.State,
}
if err := newProvider.Configure(pCfg); err != nil {
return fmt.Errorf("error configuring provider: %v", err)
}
// Set up a defer to clean up the new provider if we exit early due to an error.
cleanupNewProvider := true
defer func() {
if cleanupNewProvider {
if err := newProvider.Cleanup(); err != nil {
c.logger.Warn("failed to clean up CA provider while handling startup failure", "provider", newProvider, "error", err)
}
}
}()
// If this is a secondary, just check if the intermediate needs to be regenerated.
if c.srv.config.Datacenter != c.srv.config.PrimaryDatacenter {
if err := c.srv.caManager.initializeSecondaryCA(newProvider, args.Config); err != nil {
return fmt.Errorf("Error updating secondary datacenter CA config: %v", err)
}
cleanupNewProvider = false
c.logger.Info("Secondary CA provider config updated")
return nil
}
if err := newProvider.GenerateRoot(); err != nil {
return fmt.Errorf("error generating CA root certificate: %v", err)
}
newRootPEM, err := newProvider.ActiveRoot()
if err != nil {
return err
}
newActiveRoot, err := parseCARoot(newRootPEM, args.Config.Provider, args.Config.ClusterID)
if err != nil {
return err
}
// See if the provider needs to persist any state along with the config
pState, err := newProvider.State()
if err != nil {
return fmt.Errorf("error getting provider state: %v", err)
}
args.Config.State = pState
// Compare the new provider's root CA ID to the current one. If they
// match, just update the existing provider with the new config.
// If they don't match, begin the root rotation process.
_, root, err := state.CARootActive(nil)
if err != nil {
return err
}
// If the root didn't change, just update the config and return.
if root != nil && root.ID == newActiveRoot.ID {
args.Op = structs.CAOpSetConfig
resp, err := c.srv.raftApply(structs.ConnectCARequestType, args)
if err != nil {
return err
}
if respErr, ok := resp.(error); ok {
return respErr
}
// If the config has been committed, update the local provider instance
cleanupNewProvider = false
c.setCAProvider(newProvider, newActiveRoot)
c.logger.Info("CA provider config updated")
return nil
}
// At this point, we know the config change has trigged a root rotation,
// either by swapping the provider type or changing the provider's config
// to use a different root certificate.
// First up, sanity check that the current provider actually supports
// cross-signing.
oldProvider, _ := c.getCAProvider()
if oldProvider == nil {
return fmt.Errorf("internal error: CA provider is nil")
}
canXSign, err := oldProvider.SupportsCrossSigning()
if err != nil {
return fmt.Errorf("CA provider error: %s", err)
}
if !canXSign && !args.Config.ForceWithoutCrossSigning {
return errors.New("The current CA Provider does not support cross-signing. " +
"You can try again with ForceWithoutCrossSigningSet but this may cause " +
"disruption - see documentation for more.")
}
if !canXSign && args.Config.ForceWithoutCrossSigning {
c.logger.Warn("current CA doesn't support cross signing but " +
"CA reconfiguration forced anyway with ForceWithoutCrossSigning")
}
// If it's a config change that would trigger a rotation (different provider/root):
// 1. Get the root from the new provider.
// 2. Call CrossSignCA on the old provider to sign the new root with the old one to
// get a cross-signed certificate.
// 3. Take the active root for the new provider and append the intermediate from step 2
// to its list of intermediates.
newRoot, err := connect.ParseCert(newRootPEM)
if err != nil {
return err
}
if canXSign {
// Have the old provider cross-sign the new root
xcCert, err := oldProvider.CrossSignCA(newRoot)
if err != nil {
return err
}
// Add the cross signed cert to the new CA's intermediates (to be attached
// to leaf certs).
newActiveRoot.IntermediateCerts = []string{xcCert}
}
intermediate, err := newProvider.GenerateIntermediate()
if err != nil {
return err
}
if intermediate != newRootPEM {
newActiveRoot.IntermediateCerts = append(newActiveRoot.IntermediateCerts, intermediate)
}
// Update the roots and CA config in the state store at the same time
idx, roots, err := state.CARoots(nil)
if err != nil {
return err
}
var newRoots structs.CARoots
for _, r := range roots {
newRoot := *r
if newRoot.Active {
newRoot.Active = false
newRoot.RotatedOutAt = time.Now()
}
newRoots = append(newRoots, &newRoot)
}
newRoots = append(newRoots, newActiveRoot)
args.Op = structs.CAOpSetRootsAndConfig
args.Index = idx
args.Config.ModifyIndex = confIdx
args.Roots = newRoots
resp, err := c.srv.raftApply(structs.ConnectCARequestType, args)
if err != nil {
return err
}
if respErr, ok := resp.(error); ok {
return respErr
}
if respOk, ok := resp.(bool); ok && !respOk {
return fmt.Errorf("could not atomically update roots and config")
}
// If the config has been committed, update the local provider instance
// and call teardown on the old provider
cleanupNewProvider = false
c.setCAProvider(newProvider, newActiveRoot)
if err := oldProvider.Cleanup(); err != nil {
c.logger.Warn("failed to clean up old provider", "provider", config.Provider)
}
c.logger.Info("CA rotated to new root under provider", "provider", args.Config.Provider)
return nil
}
// getIntermediateCAPrimary regenerates the intermediate cert in the primary datacenter.
// This is only run for CAs that require an intermediary in the primary DC, such as Vault.
// This function is being called while holding caProviderReconfigurationLock
@ -617,9 +854,7 @@ func (c *CAManager) getIntermediateCASigned(provider ca.Provider, newActiveRoot
return nil
}
// intermediateCertRenewalWatch checks the intermediate cert for
// expiration. As soon as more than half the time a cert is valid has passed,
// it will try to renew it.
// intermediateCertRenewalWatch periodically attempts to renew the intermediate cert.
func (c *CAManager) intermediateCertRenewalWatch(ctx context.Context) error {
isPrimary := c.srv.config.Datacenter == c.srv.config.PrimaryDatacenter
@ -629,81 +864,7 @@ func (c *CAManager) intermediateCertRenewalWatch(ctx context.Context) error {
return nil
case <-time.After(structs.IntermediateCertRenewInterval):
retryLoopBackoffAbortOnSuccess(ctx, func() error {
if !isPrimary {
c.logger.Info("starting check for intermediate renewal")
}
// Grab the 'lock' right away so the provider/config can't be changed out while we check
// the intermediate.
if err := c.setState(CAStateRenewIntermediate); err != nil {
return err
}
defer c.setReady()
provider, _ := c.getCAProvider()
if provider == nil {
// this happens when leadership is being revoked and this go routine will be stopped
return nil
}
// If this isn't the primary, make sure the CA has been initialized.
if !isPrimary && !c.configuredSecondaryCA() {
return fmt.Errorf("secondary CA is not yet configured.")
}
state := c.srv.fsm.State()
_, activeRoot, err := state.CARootActive(nil)
if err != nil {
return err
}
// If this is the primary, check if this is a provider that uses an intermediate cert. If
// it isn't, we don't need to check for a renewal.
if isPrimary {
_, config, err := state.CAConfig(nil)
if err != nil {
return err
}
if _, ok := ca.PrimaryIntermediateProviders[config.Provider]; !ok {
return nil
}
} else {
c.logger.Info("Checking for intermediate renewal")
}
activeIntermediate, err := provider.ActiveIntermediate()
if err != nil {
return err
}
if activeIntermediate == "" {
return fmt.Errorf("datacenter doesn't have an active intermediate.")
}
intermediateCert, err := connect.ParseCert(activeIntermediate)
if err != nil {
return fmt.Errorf("error parsing active intermediate cert: %v", err)
}
if lessThanHalfTimePassed(time.Now(), intermediateCert.NotBefore.Add(ca.CertificateTimeDriftBuffer),
intermediateCert.NotAfter) {
return nil
}
// Enough time has passed, go ahead with getting a new intermediate.
renewalFunc := c.getIntermediateCAPrimary
if !isPrimary {
renewalFunc = c.getIntermediateCASigned
}
if err := renewalFunc(provider, activeRoot); err != nil {
return err
}
if err := c.persistNewRootAndConfig(provider, activeRoot, nil); err != nil {
return err
}
c.setCAProvider(provider, activeRoot)
return nil
return c.RenewIntermediate(isPrimary)
}, func(err error) {
c.logger.Error("error renewing intermediate certs",
"routine", intermediateCertRenewWatchRoutineName,
@ -714,6 +875,82 @@ func (c *CAManager) intermediateCertRenewalWatch(ctx context.Context) error {
}
}
// RenewIntermediate checks the intermediate cert for
// expiration. If more than half the time a cert is valid has passed,
// it will try to renew it.
func (c *CAManager) RenewIntermediate(isPrimary bool) error {
// Grab the 'lock' right away so the provider/config can't be changed out while we check
// the intermediate.
if err := c.setState(CAStateRenewIntermediate, true); err != nil {
return err
}
defer c.setState(CAStateReady, false)
provider, _ := c.getCAProvider()
if provider == nil {
// this happens when leadership is being revoked and this go routine will be stopped
return nil
}
// If this isn't the primary, make sure the CA has been initialized.
if !isPrimary && !c.configuredSecondaryCA() {
return fmt.Errorf("secondary CA is not yet configured.")
}
state := c.srv.fsm.State()
_, activeRoot, err := state.CARootActive(nil)
if err != nil {
return err
}
// If this is the primary, check if this is a provider that uses an intermediate cert. If
// it isn't, we don't need to check for a renewal.
if isPrimary {
_, config, err := state.CAConfig(nil)
if err != nil {
return err
}
if _, ok := ca.PrimaryIntermediateProviders[config.Provider]; !ok {
return nil
}
}
activeIntermediate, err := provider.ActiveIntermediate()
if err != nil {
return err
}
if activeIntermediate == "" {
return fmt.Errorf("datacenter doesn't have an active intermediate.")
}
intermediateCert, err := connect.ParseCert(activeIntermediate)
if err != nil {
return fmt.Errorf("error parsing active intermediate cert: %v", err)
}
if lessThanHalfTimePassed(time.Now(), intermediateCert.NotBefore.Add(ca.CertificateTimeDriftBuffer),
intermediateCert.NotAfter) {
return nil
}
// Enough time has passed, go ahead with getting a new intermediate.
renewalFunc := c.getIntermediateCAPrimary
if !isPrimary {
renewalFunc = c.getIntermediateCASigned
}
if err := renewalFunc(provider, activeRoot); err != nil {
return err
}
if err := c.persistNewRootAndConfig(provider, activeRoot, nil); err != nil {
return err
}
c.setCAProvider(provider, activeRoot)
return nil
}
// secondaryCARootWatch maintains a blocking query to the primary datacenter's
// ConnectCA.Roots endpoint to monitor when it needs to request a new signed
// intermediate certificate.
@ -734,43 +971,10 @@ func (c *CAManager) secondaryCARootWatch(ctx context.Context) error {
return fmt.Errorf("Error retrieving the primary datacenter's roots: %v", err)
}
// Update the state first to claim the 'lock'.
if err := c.setState(CAStateReconfig); err != nil {
// Attempt to update the roots using the returned data.
if err := c.UpdateRoots(roots); err != nil {
return err
}
defer c.setReady()
// Update the cached primary roots now that the lock is held.
c.primaryRoots = roots
// Check to see if the primary has been upgraded in case we're waiting to switch to
// secondary mode.
provider, _ := c.getCAProvider()
if provider == nil {
// this happens when leadership is being revoked and this go routine will be stopped
return nil
}
if !c.configuredSecondaryCA() {
versionOk, primaryFound := ServersInDCMeetMinimumVersion(c.srv, c.srv.config.PrimaryDatacenter, minMultiDCConnectVersion)
if !primaryFound {
return fmt.Errorf("Primary datacenter is unreachable - deferring secondary CA initialization")
}
if versionOk {
if err := c.initializeSecondaryProvider(provider, roots); err != nil {
return fmt.Errorf("Failed to initialize secondary CA provider: %v", err)
}
}
}
// Run the secondary CA init routine to see if we need to request a new
// intermediate.
if c.configuredSecondaryCA() {
if err := c.initializeSecondaryCA(provider, nil); err != nil {
return fmt.Errorf("Failed to initialize the secondary CA: %v", err)
}
}
args.QueryOptions.MinQueryIndex = nextIndexVal(args.QueryOptions.MinQueryIndex, roots.QueryMeta.Index)
return nil
}, func(err error) {
@ -783,6 +987,51 @@ func (c *CAManager) secondaryCARootWatch(ctx context.Context) error {
return nil
}
// UpdateRoots updates the cached roots from the primary and regenerates the intermediate
// certificate if necessary.
func (c *CAManager) UpdateRoots(roots structs.IndexedCARoots) error {
// Update the state first to claim the 'lock'.
if err := c.setState(CAStateReconfig, true); err != nil {
return err
}
defer c.setState(CAStateReady, false)
// Update the cached primary roots now that the lock is held.
if err := c.setPrimaryRoots(roots); err != nil {
return err
}
// Check to see if the primary has been upgraded in case we're waiting to switch to
// secondary mode.
provider, _ := c.getCAProvider()
if provider == nil {
// this happens when leadership is being revoked and this go routine will be stopped
return nil
}
if !c.configuredSecondaryCA() {
versionOk, primaryFound := ServersInDCMeetMinimumVersion(c.srv, c.srv.config.PrimaryDatacenter, minMultiDCConnectVersion)
if !primaryFound {
return fmt.Errorf("Primary datacenter is unreachable - deferring secondary CA initialization")
}
if versionOk {
if err := c.initializeSecondaryProvider(provider, roots); err != nil {
return fmt.Errorf("Failed to initialize secondary CA provider: %v", err)
}
}
}
// Run the secondary CA init routine to see if we need to request a new
// intermediate.
if c.configuredSecondaryCA() {
if err := c.initializeSecondaryCA(provider, nil); err != nil {
return fmt.Errorf("Failed to initialize the secondary CA: %v", err)
}
}
return nil
}
// initializeSecondaryProvider configures the given provider for a secondary, non-root datacenter.
// It is being called while holding the stateLock in order to update actingSecondaryCA, which means
// it must never take that lock itself or call anything that does.
@ -808,14 +1057,26 @@ func (c *CAManager) initializeSecondaryProvider(provider ca.Provider, roots stru
return fmt.Errorf("error configuring provider: %v", err)
}
c.actingSecondaryCA = true
return c.setSecondaryCA()
}
// setSecondaryCA sets the flag for acting as a secondary CA to true.
func (c *CAManager) setSecondaryCA() error {
c.stateLock.Lock()
defer c.stateLock.Unlock()
if c.state == CAStateInitializing || c.state == CAStateReconfig {
c.actingSecondaryCA = true
} else {
return fmt.Errorf("Cannot update secondary CA flag in state %q", c.state)
}
return nil
}
// configuredSecondaryCA returns true if we have been initialized as a secondary datacenter's CA.
func (c *CAManager) configuredSecondaryCA() bool {
c.stateLock.RLock()
defer c.stateLock.RUnlock()
c.stateLock.Lock()
defer c.stateLock.Unlock()
return c.actingSecondaryCA
}

3
agent/consul/server.go
View File

@ -136,9 +136,6 @@ type Server struct {
// autopilot is the Autopilot instance for this server.
autopilot *autopilot.Autopilot
// autopilotWaitGroup is used to block until Autopilot shuts down.
autopilotWaitGroup sync.WaitGroup
// caManager is used to synchronize CA operations across the leader and RPC functions.
caManager *CAManager