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connect: Enable renewing the intermediate cert in the primary DC

This commit is contained in:
Kyle Havlovitz 2020-09-30 12:31:21 -07:00
parent d27475b239
commit 2ec94b027e
7 changed files with 330 additions and 147 deletions
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7
agent/connect/ca/provider.go
View File

@ -16,6 +16,13 @@ import (
// on servers and CA provider.
var ErrRateLimited = errors.New("operation rate limited by CA provider")
// PrimaryIntermediateProviders is a list of CA providers that make use use of an
// intermediate cert in the primary datacenter as well as the secondary. This is used
// when determining whether to run the intermediate renewal routine in the primary.
var PrimaryIntermediateProviders = map[string]struct{}{
"vault": struct{}{},
}
// ProviderConfig encapsulates all the data Consul passes to `Configure` on a
// new provider instance. The provider must treat this as read-only and make
// copies of any map or slice if it might modify them internally.

21
agent/connect/ca/provider_vault.go
View File

@ -92,7 +92,7 @@ func (v *VaultProvider) Configure(cfg ProviderConfig) error {
// Set up a renewer to renew the token automatically, if supported.
if token.Renewable {
lifetimeWatcher, err := client.NewLifetimeWatcher(&vaultapi.LifetimeWatcherInput{
renewer, err := client.NewRenewer(&vaultapi.RenewerInput{
Secret: &vaultapi.Secret{
Auth: &vaultapi.SecretAuth{
ClientToken: config.Token,
@ -101,7 +101,6 @@ func (v *VaultProvider) Configure(cfg ProviderConfig) error {
},
},
Increment: token.TTL,
RenewBehavior: vaultapi.RenewBehaviorIgnoreErrors,
})
if err != nil {
return fmt.Errorf("Error beginning Vault provider token renewal: %v", err)
@ -109,31 +108,31 @@ func (v *VaultProvider) Configure(cfg ProviderConfig) error {
ctx, cancel := context.WithCancel(context.TODO())
v.shutdown = cancel
go v.renewToken(ctx, lifetimeWatcher)
go v.renewToken(ctx, renewer)
}
return nil
}
// renewToken uses a vaultapi.Renewer to repeatedly renew our token's lease.
func (v *VaultProvider) renewToken(ctx context.Context, watcher *vaultapi.LifetimeWatcher) {
go watcher.Start()
defer watcher.Stop()
func (v *VaultProvider) renewToken(ctx context.Context, renewer *vaultapi.Renewer) {
go renewer.Renew()
defer renewer.Stop()
for {
select {
case <-ctx.Done():
return
case err := <-watcher.DoneCh():
case err := <-renewer.DoneCh():
if err != nil {
v.logger.Error("Error renewing token for Vault provider", "error", err)
}
// Watcher routine has finished, so start it again.
go watcher.Start()
// Renewer routine has finished, so start it again.
go renewer.Renew()
case <-watcher.RenewCh():
case <-renewer.RenewCh():
v.logger.Error("Successfully renewed token for Vault provider")
}
}
@ -384,6 +383,7 @@ func (v *VaultProvider) GenerateIntermediate() (string, error) {
"csr": csr,
"use_csr_values": true,
"format": "pem_bundle",
"ttl": v.config.IntermediateCertTTL.String(),
})
if err != nil {
return "", err
@ -456,6 +456,7 @@ func (v *VaultProvider) SignIntermediate(csr *x509.CertificateRequest) (string,
"use_csr_values": true,
"format": "pem_bundle",
"max_path_length": 0,
"ttl": v.config.IntermediateCertTTL.String(),
})
if err != nil {
return "", err

131
agent/connect/ca/provider_vault_test.go
View File

@ -7,13 +7,11 @@ import (
"io/ioutil"
"os"
"os/exec"
"sync"
"testing"
"time"
"github.com/hashicorp/consul/agent/connect"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/sdk/freeport"
"github.com/hashicorp/consul/sdk/testutil/retry"
"github.com/hashicorp/go-hclog"
vaultapi "github.com/hashicorp/vault/api"
@ -70,7 +68,7 @@ func TestVaultCAProvider_RenewToken(t *testing.T) {
require.NoError(t, err)
providerToken := secret.Auth.ClientToken
_, err = createVaultProvider(t, true, testVault.addr, providerToken, nil)
_, err = createVaultProvider(t, true, testVault.Addr, providerToken, nil)
require.NoError(t, err)
// Check the last renewal time.
@ -382,11 +380,11 @@ func getIntermediateCertTTL(t *testing.T, caConf *structs.CAConfiguration) time.
return dur
}
func testVaultProvider(t *testing.T) (*VaultProvider, *testVaultServer) {
func testVaultProvider(t *testing.T) (*VaultProvider, *TestVaultServer) {
return testVaultProviderWithConfig(t, true, nil)
}
func testVaultProviderWithConfig(t *testing.T, isPrimary bool, rawConf map[string]interface{}) (*VaultProvider, *testVaultServer) {
func testVaultProviderWithConfig(t *testing.T, isPrimary bool, rawConf map[string]interface{}) (*VaultProvider, *TestVaultServer) {
testVault, err := runTestVault(t)
if err != nil {
t.Fatalf("err: %v", err)
@ -394,7 +392,7 @@ func testVaultProviderWithConfig(t *testing.T, isPrimary bool, rawConf map[strin
testVault.WaitUntilReady(t)
provider, err := createVaultProvider(t, isPrimary, testVault.addr, testVault.rootToken, rawConf)
provider, err := createVaultProvider(t, isPrimary, testVault.Addr, testVault.RootToken, rawConf)
if err != nil {
testVault.Stop()
t.Fatalf("err: %v", err)
@ -459,124 +457,3 @@ func skipIfVaultNotPresent(t *testing.T) {
t.Skipf("%q not found on $PATH - download and install to run this test", vaultBinaryName)
}
}
func runTestVault(t *testing.T) (*testVaultServer, error) {
vaultBinaryName := os.Getenv("VAULT_BINARY_NAME")
if vaultBinaryName == "" {
vaultBinaryName = "vault"
}
path, err := exec.LookPath(vaultBinaryName)
if err != nil || path == "" {
return nil, fmt.Errorf("%q not found on $PATH", vaultBinaryName)
}
ports := freeport.MustTake(2)
returnPortsFn := func() {
freeport.Return(ports)
}
var (
clientAddr = fmt.Sprintf("127.0.0.1:%d", ports[0])
clusterAddr = fmt.Sprintf("127.0.0.1:%d", ports[1])
)
const token = "root"
client, err := vaultapi.NewClient(&vaultapi.Config{
Address: "http://" + clientAddr,
})
if err != nil {
returnPortsFn()
return nil, err
}
client.SetToken(token)
args := []string{
"server",
"-dev",
"-dev-root-token-id",
token,
"-dev-listen-address",
clientAddr,
"-address",
clusterAddr,
}
cmd := exec.Command(vaultBinaryName, args...)
cmd.Stdout = ioutil.Discard
cmd.Stderr = ioutil.Discard
if err := cmd.Start(); err != nil {
returnPortsFn()
return nil, err
}
testVault := &testVaultServer{
rootToken: token,
addr: "http://" + clientAddr,
cmd: cmd,
client: client,
returnPortsFn: returnPortsFn,
}
t.Cleanup(func() {
testVault.Stop()
})
return testVault, nil
}
type testVaultServer struct {
rootToken string
addr string
cmd *exec.Cmd
client *vaultapi.Client
// returnPortsFn will put the ports claimed for the test back into the
returnPortsFn func()
}
var printedVaultVersion sync.Once
func (v *testVaultServer) WaitUntilReady(t *testing.T) {
var version string
retry.Run(t, func(r *retry.R) {
resp, err := v.client.Sys().Health()
if err != nil {
r.Fatalf("err: %v", err)
}
if !resp.Initialized {
r.Fatalf("vault server is not initialized")
}
if resp.Sealed {
r.Fatalf("vault server is sealed")
}
version = resp.Version
})
printedVaultVersion.Do(func() {
fmt.Fprintf(os.Stderr, "[INFO] agent/connect/ca: testing with vault server version: %s\n", version)
})
}
func (v *testVaultServer) Stop() error {
// There was no process
if v.cmd == nil {
return nil
}
if v.cmd.Process != nil {
if err := v.cmd.Process.Signal(os.Interrupt); err != nil {
return fmt.Errorf("failed to kill vault server: %v", err)
}
}
// wait for the process to exit to be sure that the data dir can be
// deleted on all platforms.
if err := v.cmd.Wait(); err != nil {
return err
}
if v.returnPortsFn != nil {
v.returnPortsFn()
}
return nil
}

142
agent/connect/ca/testing.go
View File

@ -3,9 +3,15 @@ package ca
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"sync"
"github.com/hashicorp/consul/agent/connect"
"github.com/hashicorp/consul/sdk/freeport"
"github.com/hashicorp/consul/sdk/testutil/retry"
"github.com/hashicorp/go-hclog"
vaultapi "github.com/hashicorp/vault/api"
"github.com/mitchellh/go-testing-interface"
)
@ -76,3 +82,139 @@ func TestConsulProvider(t testing.T, d ConsulProviderStateDelegate) *ConsulProvi
provider.SetLogger(logger)
return provider
}
func NewTestVaultServer(t testing.T) *TestVaultServer {
testVault, err := runTestVault(t)
if err != nil {
t.Fatalf("err: %v", err)
}
testVault.WaitUntilReady(t)
return testVault
}
func runTestVault(t testing.T) (*TestVaultServer, error) {
vaultBinaryName := os.Getenv("VAULT_BINARY_NAME")
if vaultBinaryName == "" {
vaultBinaryName = "vault"
}
path, err := exec.LookPath(vaultBinaryName)
if err != nil || path == "" {
return nil, fmt.Errorf("%q not found on $PATH", vaultBinaryName)
}
ports := freeport.MustTake(2)
returnPortsFn := func() {
freeport.Return(ports)
}
var (
clientAddr = fmt.Sprintf("127.0.0.1:%d", ports[0])
clusterAddr = fmt.Sprintf("127.0.0.1:%d", ports[1])
)
const token = "root"
client, err := vaultapi.NewClient(&vaultapi.Config{
Address: "http://" + clientAddr,
})
if err != nil {
returnPortsFn()
return nil, err
}
client.SetToken(token)
args := []string{
"server",
"-dev",
"-dev-root-token-id",
token,
"-dev-listen-address",
clientAddr,
"-address",
clusterAddr,
}
cmd := exec.Command(vaultBinaryName, args...)
cmd.Stdout = ioutil.Discard
cmd.Stderr = ioutil.Discard
if err := cmd.Start(); err != nil {
returnPortsFn()
return nil, err
}
testVault := &TestVaultServer{
RootToken: token,
Addr: "http://" + clientAddr,
cmd: cmd,
client: client,
returnPortsFn: returnPortsFn,
}
t.Cleanup(func() {
testVault.Stop()
})
return testVault, nil
}
type TestVaultServer struct {
RootToken string
Addr string
cmd *exec.Cmd
client *vaultapi.Client
// returnPortsFn will put the ports claimed for the test back into the
returnPortsFn func()
}
var printedVaultVersion sync.Once
func (v *TestVaultServer) Client() *vaultapi.Client {
return v.client
}
func (v *TestVaultServer) WaitUntilReady(t testing.T) {
var version string
retry.Run(t, func(r *retry.R) {
resp, err := v.client.Sys().Health()
if err != nil {
r.Fatalf("err: %v", err)
}
if !resp.Initialized {
r.Fatalf("vault server is not initialized")
}
if resp.Sealed {
r.Fatalf("vault server is sealed")
}
version = resp.Version
})
printedVaultVersion.Do(func() {
fmt.Fprintf(os.Stderr, "[INFO] agent/connect/ca: testing with vault server version: %s\n", version)
})
}
func (v *TestVaultServer) Stop() error {
// There was no process
if v.cmd == nil {
return nil
}
if v.cmd.Process != nil {
if err := v.cmd.Process.Signal(os.Interrupt); err != nil {
return fmt.Errorf("failed to kill vault server: %v", err)
}
}
// wait for the process to exit to be sure that the data dir can be
// deleted on all platforms.
if err := v.cmd.Wait(); err != nil {
return err
}
if v.returnPortsFn != nil {
v.returnPortsFn()
}
return nil
}

59
agent/consul/leader_connect.go
View File

@ -510,6 +510,31 @@ func (s *Server) persistNewRoot(provider ca.Provider, newActiveRoot *structs.CAR
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
// which means it must never take that lock itself or call anything that does.
func (s *Server) getIntermediateCAPrimary(provider ca.Provider, newActiveRoot *structs.CARoot) error {
connectLogger := s.loggers.Named(logging.Connect)
intermediatePEM, err := provider.GenerateIntermediate()
if err != nil {
return fmt.Errorf("error generating new intermediate cert: %v", err)
}
intermediateCert, err := connect.ParseCert(intermediatePEM)
if err != nil {
return fmt.Errorf("error parsing intermediate cert: %v", err)
}
// Append the new intermediate to our local active root entry. This is
// where the root representations start to diverge.
newActiveRoot.IntermediateCerts = append(newActiveRoot.IntermediateCerts, intermediatePEM)
newActiveRoot.SigningKeyID = connect.EncodeSigningKeyID(intermediateCert.SubjectKeyId)
connectLogger.Info("generated new intermediate certificate in primary datacenter")
return nil
}
// getIntermediateCASigned is being called while holding caProviderReconfigurationLock
// which means it must never take that lock itself or call anything that does.
func (s *Server) getIntermediateCASigned(provider ca.Provider, newActiveRoot *structs.CARoot) error {
@ -558,10 +583,10 @@ func (s *Server) startConnectLeader() {
if s.config.ConnectEnabled && s.config.Datacenter != s.config.PrimaryDatacenter {
s.leaderRoutineManager.Start(secondaryCARootWatchRoutineName, s.secondaryCARootWatch)
s.leaderRoutineManager.Start(intentionReplicationRoutineName, s.replicateIntentions)
s.leaderRoutineManager.Start(secondaryCertRenewWatchRoutineName, s.secondaryIntermediateCertRenewalWatch)
s.startConnectLeaderEnterprise()
}
s.leaderRoutineManager.Start(intermediateCertRenewWatchRoutineName, s.intermediateCertRenewalWatch)
s.leaderRoutineManager.Start(caRootPruningRoutineName, s.runCARootPruning)
}
@ -652,11 +677,12 @@ func (s *Server) pruneCARoots() error {
return nil
}
// secondaryIntermediateCertRenewalWatch checks the intermediate cert for
// 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.
func (s *Server) secondaryIntermediateCertRenewalWatch(ctx context.Context) error {
func (s *Server) intermediateCertRenewalWatch(ctx context.Context) error {
connectLogger := s.loggers.Named(logging.Connect)
isPrimary := s.config.Datacenter == s.config.PrimaryDatacenter
for {
select {
@ -672,7 +698,8 @@ func (s *Server) secondaryIntermediateCertRenewalWatch(ctx context.Context) erro
// this happens when leadership is being revoked and this go routine will be stopped
return nil
}
if !s.configuredSecondaryCA() {
// If this isn't the primary, make sure the CA has been initialized.
if !isPrimary && !s.configuredSecondaryCA() {
return fmt.Errorf("secondary CA is not yet configured.")
}
@ -682,13 +709,26 @@ func (s *Server) secondaryIntermediateCertRenewalWatch(ctx context.Context) erro
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("secondary datacenter doesn't have an active intermediate.")
return fmt.Errorf("datacenter doesn't have an active intermediate.")
}
intermediateCert, err := connect.ParseCert(activeIntermediate)
@ -698,10 +738,15 @@ func (s *Server) secondaryIntermediateCertRenewalWatch(ctx context.Context) erro
if lessThanHalfTimePassed(time.Now(), intermediateCert.NotBefore.Add(ca.CertificateTimeDriftBuffer),
intermediateCert.NotAfter) {
//connectLogger.Info("checked time passed", intermediateCert.NotBefore.Add(ca.CertificateTimeDriftBuffer), intermediateCert.NotAfter)
return nil
}
if err := s.getIntermediateCASigned(provider, activeRoot); err != nil {
renewalFunc := s.getIntermediateCAPrimary
if !isPrimary {
renewalFunc = s.getIntermediateCASigned
}
if err := renewalFunc(provider, activeRoot); err != nil {
return err
}
@ -713,7 +758,7 @@ func (s *Server) secondaryIntermediateCertRenewalWatch(ctx context.Context) erro
return nil
}, func(err error) {
connectLogger.Error("error renewing intermediate certs",
"routine", secondaryCertRenewWatchRoutineName,
"routine", intermediateCertRenewWatchRoutineName,
"error", err,
)
})

113
agent/consul/leader_connect_test.go
View File

@ -13,7 +13,7 @@ import (
"time"
"github.com/hashicorp/consul/agent/connect"
ca "github.com/hashicorp/consul/agent/connect/ca"
"github.com/hashicorp/consul/agent/connect/ca"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/agent/token"
tokenStore "github.com/hashicorp/consul/agent/token"
@ -181,6 +181,117 @@ func getCAProviderWithLock(s *Server) (ca.Provider, *structs.CARoot) {
return s.getCAProvider()
}
func TestLeader_PrimaryCA_IntermediateRenew(t *testing.T) {
// no parallel execution because we change globals
origInterval := structs.IntermediateCertRenewInterval
origMinTTL := structs.MinLeafCertTTL
defer func() {
structs.IntermediateCertRenewInterval = origInterval
structs.MinLeafCertTTL = origMinTTL
}()
structs.IntermediateCertRenewInterval = time.Millisecond
structs.MinLeafCertTTL = time.Second
require := require.New(t)
testVault := ca.NewTestVaultServer(t)
defer testVault.Stop()
dir1, s1 := testServerWithConfig(t, func(c *Config) {
c.Build = "1.6.0"
c.PrimaryDatacenter = "dc1"
c.CAConfig = &structs.CAConfiguration{
Provider: "vault",
Config: map[string]interface{}{
"Address": testVault.Addr,
"Token": testVault.RootToken,
"RootPKIPath": "pki-root/",
"IntermediatePKIPath": "pki-intermediate/",
"LeafCertTTL": "5s",
// The retry loop only retries for 7sec max and
// the ttl needs to be below so that it
// triggers definitely.
// Since certs are created so that they are
// valid from 1minute in the past, we need to
// account for that, otherwise it will be
// expired immediately.
"IntermediateCertTTL": "15s",
},
}
})
defer os.RemoveAll(dir1)
defer s1.Shutdown()
testrpc.WaitForLeader(t, s1.RPC, "dc1")
// Capture the current root
var originalRoot *structs.CARoot
{
rootList, activeRoot, err := getTestRoots(s1, "dc1")
require.NoError(err)
require.Len(rootList.Roots, 1)
originalRoot = activeRoot
}
// Get the original intermediate
waitForActiveCARoot(t, s1, originalRoot)
provider, _ := getCAProviderWithLock(s1)
intermediatePEM, err := provider.ActiveIntermediate()
require.NoError(err)
cert, err := connect.ParseCert(intermediatePEM)
require.NoError(err)
// Wait for dc1's intermediate to be refreshed.
// It is possible that test fails when the blocking query doesn't return.
retry.Run(t, func(r *retry.R) {
provider, _ = getCAProviderWithLock(s1)
newIntermediatePEM, err := provider.ActiveIntermediate()
r.Check(err)
_, err = connect.ParseCert(intermediatePEM)
r.Check(err)
if newIntermediatePEM == intermediatePEM {
r.Fatal("not a renewed intermediate")
}
intermediatePEM = newIntermediatePEM
})
require.NoError(err)
// Get the root from dc1 and validate a chain of:
// dc1 leaf -> dc1 intermediate -> dc1 root
provider, caRoot := getCAProviderWithLock(s1)
// Have the new intermediate sign a leaf cert and make sure the chain is correct.
spiffeService := &connect.SpiffeIDService{
Host: "node1",
Namespace: "default",
Datacenter: "dc1",
Service: "foo",
}
raw, _ := connect.TestCSR(t, spiffeService)
leafCsr, err := connect.ParseCSR(raw)
require.NoError(err)
leafPEM, err := provider.Sign(leafCsr)
require.NoError(err)
cert, err = connect.ParseCert(leafPEM)
require.NoError(err)
// Check that the leaf signed by the new intermediate can be verified using the
// returned cert chain (signed intermediate + remote root).
intermediatePool := x509.NewCertPool()
intermediatePool.AppendCertsFromPEM([]byte(intermediatePEM))
rootPool := x509.NewCertPool()
rootPool.AppendCertsFromPEM([]byte(caRoot.RootCert))
_, err = cert.Verify(x509.VerifyOptions{
Intermediates: intermediatePool,
Roots: rootPool,
})
require.NoError(err)
}
func TestLeader_SecondaryCA_IntermediateRenew(t *testing.T) {
// no parallel execution because we change globals
origInterval := structs.IntermediateCertRenewInterval

2
agent/consul/server.go
View File

@ -102,7 +102,7 @@ const (
federationStatePruningRoutineName = "federation state pruning"
intentionReplicationRoutineName = "intention replication"
secondaryCARootWatchRoutineName = "secondary CA roots watch"
secondaryCertRenewWatchRoutineName = "secondary cert renew watch"
intermediateCertRenewWatchRoutineName = "intermediate cert renew watch"
)
var (