open-consul/agent/auto-config/tls.go

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package autoconf
import (
"context"
"fmt"
"net"
"github.com/hashicorp/consul/agent/cache"
cachetype "github.com/hashicorp/consul/agent/cache-types"
"github.com/hashicorp/consul/agent/connect"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/proto/pbautoconf"
)
const (
// ID of the roots watch
rootsWatchID = "roots"
// ID of the leaf watch
leafWatchID = "leaf"
unknownTrustDomain = "unknown"
)
var (
defaultDNSSANs = []string{"localhost"}
defaultIPSANs = []net.IP{{127, 0, 0, 1}, net.ParseIP("::1")}
)
func extractPEMs(roots *structs.IndexedCARoots) []string {
var pems []string
for _, root := range roots.Roots {
pems = append(pems, root.RootCert)
}
return pems
}
// updateTLSFromResponse will update the TLS certificate and roots in the shared
// TLS configurator.
func (ac *AutoConfig) updateTLSFromResponse(resp *pbautoconf.AutoConfigResponse) error {
var pems []string
for _, root := range resp.GetCARoots().GetRoots() {
pems = append(pems, root.RootCert)
}
err := ac.acConfig.TLSConfigurator.UpdateAutoTLS(
resp.ExtraCACertificates,
pems,
resp.Certificate.GetCertPEM(),
resp.Certificate.GetPrivateKeyPEM(),
resp.Config.GetTLS().GetVerifyServerHostname(),
)
if err != nil {
return fmt.Errorf("Failed to update the TLS configurator with new certificates: %w", err)
}
return nil
}
func (ac *AutoConfig) setInitialTLSCertificates(certs *structs.SignedResponse) error {
if certs == nil {
return nil
}
if err := ac.populateCertificateCache(certs); err != nil {
return fmt.Errorf("error populating cache with certificates: %w", err)
}
connectCAPems := extractPEMs(&certs.ConnectCARoots)
err := ac.acConfig.TLSConfigurator.UpdateAutoTLS(
certs.ManualCARoots,
connectCAPems,
certs.IssuedCert.CertPEM,
certs.IssuedCert.PrivateKeyPEM,
certs.VerifyServerHostname,
)
if err != nil {
return fmt.Errorf("error updating TLS configurator with certificates: %w", err)
}
return nil
}
func (ac *AutoConfig) populateCertificateCache(certs *structs.SignedResponse) error {
cert, err := connect.ParseCert(certs.IssuedCert.CertPEM)
if err != nil {
return fmt.Errorf("Failed to parse certificate: %w", err)
}
// prepolutate roots cache
rootRes := cache.FetchResult{Value: &certs.ConnectCARoots, Index: certs.ConnectCARoots.QueryMeta.Index}
rootsReq := ac.caRootsRequest()
// getting the roots doesn't require a token so in order to potentially share the cache with another
if err := ac.acConfig.Cache.Prepopulate(cachetype.ConnectCARootName, rootRes, ac.config.Datacenter, "", rootsReq.CacheInfo().Key); err != nil {
return err
}
leafReq := ac.leafCertRequest()
// prepolutate leaf cache
certRes := cache.FetchResult{
Value: &certs.IssuedCert,
Index: certs.IssuedCert.RaftIndex.ModifyIndex,
State: cachetype.ConnectCALeafSuccess(connect.EncodeSigningKeyID(cert.AuthorityKeyId)),
}
if err := ac.acConfig.Cache.Prepopulate(cachetype.ConnectCALeafName, certRes, leafReq.Datacenter, leafReq.Token, leafReq.Key()); err != nil {
return err
}
return nil
}
func (ac *AutoConfig) setupCertificateCacheWatches(ctx context.Context) (context.CancelFunc, error) {
notificationCtx, cancel := context.WithCancel(ctx)
rootsReq := ac.caRootsRequest()
err := ac.acConfig.Cache.Notify(notificationCtx, cachetype.ConnectCARootName, &rootsReq, rootsWatchID, ac.cacheUpdates)
if err != nil {
cancel()
return nil, err
}
leafReq := ac.leafCertRequest()
err = ac.acConfig.Cache.Notify(notificationCtx, cachetype.ConnectCALeafName, &leafReq, leafWatchID, ac.cacheUpdates)
if err != nil {
cancel()
return nil, err
}
return cancel, nil
}
func (ac *AutoConfig) updateCARoots(roots *structs.IndexedCARoots) error {
switch {
case ac.config.AutoConfig.Enabled:
ac.Lock()
defer ac.Unlock()
var err error
ac.autoConfigResponse.CARoots, err = translateCARootsToProtobuf(roots)
if err != nil {
return err
}
if err := ac.updateTLSFromResponse(ac.autoConfigResponse); err != nil {
return err
}
return ac.persistAutoConfig(ac.autoConfigResponse)
case ac.config.AutoEncryptTLS:
pems := extractPEMs(roots)
if err := ac.acConfig.TLSConfigurator.UpdateAutoTLSCA(pems); err != nil {
return fmt.Errorf("failed to update Connect CA certificates: %w", err)
}
return nil
default:
return nil
}
}
func (ac *AutoConfig) updateLeafCert(cert *structs.IssuedCert) error {
switch {
case ac.config.AutoConfig.Enabled:
ac.Lock()
defer ac.Unlock()
var err error
ac.autoConfigResponse.Certificate, err = translateIssuedCertToProtobuf(cert)
if err != nil {
return err
}
if err := ac.updateTLSFromResponse(ac.autoConfigResponse); err != nil {
return err
}
return ac.persistAutoConfig(ac.autoConfigResponse)
case ac.config.AutoEncryptTLS:
if err := ac.acConfig.TLSConfigurator.UpdateAutoTLSCert(cert.CertPEM, cert.PrivateKeyPEM); err != nil {
return fmt.Errorf("failed to update the agent leaf cert: %w", err)
}
return nil
default:
return nil
}
}
func (ac *AutoConfig) caRootsRequest() structs.DCSpecificRequest {
return structs.DCSpecificRequest{Datacenter: ac.config.Datacenter}
}
func (ac *AutoConfig) leafCertRequest() cachetype.ConnectCALeafRequest {
return cachetype.ConnectCALeafRequest{
Datacenter: ac.config.Datacenter,
Agent: ac.config.NodeName,
DNSSAN: ac.getDNSSANs(),
IPSAN: ac.getIPSANs(),
Token: ac.acConfig.Tokens.AgentToken(),
EnterpriseMeta: *structs.NodeEnterpriseMetaInPartition(ac.config.PartitionOrEmpty()),
}
}
// generateCSR will generate a CSR for an Agent certificate. This should
// be sent along with the AutoConfig.InitialConfiguration RPC or the
// AutoEncrypt.Sign RPC. The generated CSR does NOT have a real trust domain
// as when generating this we do not yet have the CA roots. The server will
// update the trust domain for us though.
func (ac *AutoConfig) generateCSR() (csr string, key string, err error) {
// We don't provide the correct host here, because we don't know any
// better at this point. Apart from the domain, we would need the
// ClusterID, which we don't have. This is why we go with
// unknownTrustDomain the first time. Subsequent CSRs will have the
// correct TrustDomain.
id := &connect.SpiffeIDAgent{
// will be replaced
Host: unknownTrustDomain,
Datacenter: ac.config.Datacenter,
Agent: ac.config.NodeName,
Partition: ac.config.PartitionOrDefault(),
}
caConfig, err := ac.config.ConnectCAConfiguration()
if err != nil {
return "", "", fmt.Errorf("Cannot generate CSR: %w", err)
}
conf, err := caConfig.GetCommonConfig()
if err != nil {
return "", "", fmt.Errorf("Failed to load common CA configuration: %w", err)
}
if conf.PrivateKeyType == "" {
conf.PrivateKeyType = connect.DefaultPrivateKeyType
}
if conf.PrivateKeyBits == 0 {
conf.PrivateKeyBits = connect.DefaultPrivateKeyBits
}
// Create a new private key
pk, pkPEM, err := connect.GeneratePrivateKeyWithConfig(conf.PrivateKeyType, conf.PrivateKeyBits)
if err != nil {
return "", "", fmt.Errorf("Failed to generate private key: %w", err)
}
dnsNames := ac.getDNSSANs()
ipAddresses := ac.getIPSANs()
// Create a CSR.
csr, err = connect.CreateCSR(id, pk, dnsNames, ipAddresses)
if err != nil {
return "", "", err
}
return csr, pkPEM, nil
}
func (ac *AutoConfig) getDNSSANs() []string {
sans := defaultDNSSANs
switch {
case ac.config.AutoConfig.Enabled:
sans = append(sans, ac.config.AutoConfig.DNSSANs...)
case ac.config.AutoEncryptTLS:
sans = append(sans, ac.config.AutoEncryptDNSSAN...)
}
return sans
}
func (ac *AutoConfig) getIPSANs() []net.IP {
sans := defaultIPSANs
switch {
case ac.config.AutoConfig.Enabled:
sans = append(sans, ac.config.AutoConfig.IPSANs...)
case ac.config.AutoEncryptTLS:
sans = append(sans, ac.config.AutoEncryptIPSAN...)
}
return sans
}