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Ensure cluster-signing CA files contain only a single CA cert

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Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
This commit is contained in:
Brad Davidson 2022-12-06 23:45:58 +00:00 committed by Brad Davidson
parent 1ec242d816
commit 0919ec6755
3 changed files with 69 additions and 12 deletions
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4
pkg/daemons/config/types.go
View File

@ -286,6 +286,10 @@ type ControlRuntime struct {
ClientKubeAPIKey string
NodePasswdFile string
SigningClientCA string
SigningServerCA string
ServiceCurrentKey string
KubeConfigAdmin string
KubeConfigController string
KubeConfigScheduler string

65
pkg/daemons/control/deps/deps.go
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@ -10,6 +10,7 @@ import (
"encoding/json"
"errors"
"fmt"
"io/fs"
"net"
"os"
"path/filepath"
@ -30,6 +31,7 @@ import (
"k8s.io/apiserver/pkg/apis/apiserver"
apiserverconfigv1 "k8s.io/apiserver/pkg/apis/config/v1"
"k8s.io/apiserver/pkg/authentication/user"
"k8s.io/client-go/util/keyutil"
)
const (
@ -110,6 +112,10 @@ func CreateRuntimeCertFiles(config *config.Control) {
runtime.PasswdFile = filepath.Join(config.DataDir, "cred", "passwd")
runtime.NodePasswdFile = filepath.Join(config.DataDir, "cred", "node-passwd")
runtime.SigningClientCA = filepath.Join(config.DataDir, "tls", "client-ca.nochain.crt")
runtime.SigningServerCA = filepath.Join(config.DataDir, "tls", "server-ca.nochain.crt")
runtime.ServiceCurrentKey = filepath.Join(config.DataDir, "tls", "service.current.key")
runtime.KubeConfigAdmin = filepath.Join(config.DataDir, "cred", "admin.kubeconfig")
runtime.KubeConfigController = filepath.Join(config.DataDir, "cred", "controller.kubeconfig")
runtime.KubeConfigScheduler = filepath.Join(config.DataDir, "cred", "scheduler.kubeconfig")
@ -315,6 +321,18 @@ func genClientCerts(config *config.Control) error {
return err
}
certs, err := certutil.CertsFromFile(runtime.ClientCA)
if err != nil {
return err
}
// If our CA certs are signed by a root or intermediate CA, ClientCA will contain a chain.
// The controller-manager's signer wants just a single cert, not a full chain; so create a file
// that is guaranteed to contain only a single certificate.
if err := certutil.WriteCert(runtime.SigningClientCA, certutil.EncodeCertPEM(certs[0])); err != nil {
return err
}
factory := getSigningCertFactory(regen, nil, []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth}, runtime.ClientCA, runtime.ClientCAKey)
var certGen bool
@ -486,7 +504,24 @@ func createServerSigningCertKey(config *config.Control) (bool, error) {
}
return true, nil
}
return createSigningCertKey(version.Program+"-server", runtime.ServerCA, runtime.ServerCAKey)
regen, err := createSigningCertKey(version.Program+"-server", runtime.ServerCA, runtime.ServerCAKey)
if err != nil {
return regen, err
}
// If our CA certs are signed by a root or intermediate CA, ServerCA will contain a chain.
// The controller-manager's signer wants just a single cert, not a full chain; so create a file
// that is guaranteed to contain only a single certificate.
certs, err := certutil.CertsFromFile(runtime.ServerCA)
if err != nil {
return regen, err
}
if err := certutil.WriteCert(runtime.SigningServerCA, certutil.EncodeCertPEM(certs[0])); err != nil {
return regen, err
}
return regen, nil
}
func addSANs(altNames *certutil.AltNames, sans []string) {
@ -612,17 +647,35 @@ func exists(files ...string) bool {
}
func genServiceAccount(runtime *config.ControlRuntime) error {
_, keyErr := os.Stat(runtime.ServiceKey)
if keyErr == nil {
return nil
if _, err := os.Stat(runtime.ServiceKey); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
return err
}
key, err := certutil.NewPrivateKey()
if err != nil {
return err
}
if err := certutil.WriteKey(runtime.ServiceKey, certutil.EncodePrivateKeyPEM(key)); err != nil {
return err
}
}
key, err := certutil.NewPrivateKey()
// When rotating the ServiceAccount signing key, it is necessary to keep the old keys in ServiceKey so that
// old ServiceAccount tokens can be validated during the switchover process. The first key in the file
// should be the current key used to sign ServiceAccount tokens; others are old keys used for verification
// only. Create a file containing just the first key in the list, which will be used to configure the
// signing controller.
key, err := keyutil.PrivateKeyFromFile(runtime.ServiceKey)
if err != nil {
return err
}
return certutil.WriteKey(runtime.ServiceKey, certutil.EncodePrivateKeyPEM(key))
keyData, err := keyutil.MarshalPrivateKeyToPEM(key)
if err != nil {
return err
}
return certutil.WriteKey(runtime.ServiceCurrentKey, keyData)
}
func createSigningCertKey(prefix, certFile, keyFile string) (bool, error) {

12
pkg/daemons/control/server.go
View File

@ -94,7 +94,7 @@ func controllerManager(ctx context.Context, cfg *config.Control) error {
"kubeconfig": runtime.KubeConfigController,
"authorization-kubeconfig": runtime.KubeConfigController,
"authentication-kubeconfig": runtime.KubeConfigController,
"service-account-private-key-file": runtime.ServiceKey,
"service-account-private-key-file": runtime.ServiceCurrentKey,
"allocate-node-cidrs": "true",
"service-cluster-ip-range": util.JoinIPNets(cfg.ServiceIPRanges),
"cluster-cidr": util.JoinIPNets(cfg.ClusterIPRanges),
@ -103,13 +103,13 @@ func controllerManager(ctx context.Context, cfg *config.Control) error {
"bind-address": cfg.Loopback(false),
"secure-port": "10257",
"use-service-account-credentials": "true",
"cluster-signing-kube-apiserver-client-cert-file": runtime.ClientCA,
"cluster-signing-kube-apiserver-client-cert-file": runtime.SigningClientCA,
"cluster-signing-kube-apiserver-client-key-file": runtime.ClientCAKey,
"cluster-signing-kubelet-client-cert-file": runtime.ClientCA,
"cluster-signing-kubelet-client-cert-file": runtime.SigningClientCA,
"cluster-signing-kubelet-client-key-file": runtime.ClientCAKey,
"cluster-signing-kubelet-serving-cert-file": runtime.ServerCA,
"cluster-signing-kubelet-serving-cert-file": runtime.SigningServerCA,
"cluster-signing-kubelet-serving-key-file": runtime.ServerCAKey,
"cluster-signing-legacy-unknown-cert-file": runtime.ServerCA,
"cluster-signing-legacy-unknown-cert-file": runtime.SigningServerCA,
"cluster-signing-legacy-unknown-key-file": runtime.ServerCAKey,
}
if cfg.NoLeaderElect {
@ -159,7 +159,7 @@ func apiServer(ctx context.Context, cfg *config.Control) error {
argsMap["cert-dir"] = certDir
argsMap["allow-privileged"] = "true"
argsMap["authorization-mode"] = strings.Join([]string{modes.ModeNode, modes.ModeRBAC}, ",")
argsMap["service-account-signing-key-file"] = runtime.ServiceKey
argsMap["service-account-signing-key-file"] = runtime.ServiceCurrentKey
argsMap["service-cluster-ip-range"] = util.JoinIPNets(cfg.ServiceIPRanges)
argsMap["service-node-port-range"] = cfg.ServiceNodePortRange.String()
argsMap["advertise-port"] = strconv.Itoa(cfg.AdvertisePort)