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b914398154
Fixes #3062 There's no user-visible change in this PR. It carefully separates generated secrets (e.g. certs) from source secrets from the config (e.g. CAs), so that certs are generated on config changes which actually affect cert input. And same way separates etcd and Kubernetes PKI, so if etcd CA got changed, only etcd certs will be regenerated. This should have noticeable impact with RSA-based PKI as it reduces number of times PKI gets generated. Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>
90 lines
2.4 KiB
Go
90 lines
2.4 KiB
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package kubeconfig
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import (
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"encoding/base64"
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"fmt"
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"io"
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"net/url"
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"text/template"
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"time"
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"github.com/talos-systems/crypto/x509"
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"github.com/talos-systems/talos/pkg/machinery/config"
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"github.com/talos-systems/talos/pkg/machinery/constants"
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)
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const adminKubeConfigTemplate = `apiVersion: v1
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kind: Config
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clusters:
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- name: {{ .Cluster }}
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cluster:
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server: {{ .Server }}
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certificate-authority-data: {{ .CACert }}
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users:
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- name: admin@{{ .Cluster }}
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user:
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client-certificate-data: {{ .AdminCert }}
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client-key-data: {{ .AdminKey }}
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contexts:
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- context:
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cluster: {{ .Cluster }}
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namespace: default
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user: admin@{{ .Cluster }}
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name: admin@{{ .Cluster }}
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current-context: admin@{{ .Cluster }}
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`
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// GenerateAdminInput is the interface for the GenerateAdmin function.
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//
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// This interface is implemented by config.Cluster().
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type GenerateAdminInput interface {
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Name() string
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Endpoint() *url.URL
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CA() *x509.PEMEncodedCertificateAndKey
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AdminKubeconfig() config.AdminKubeconfig
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}
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// GenerateAdmin generates admin kubeconfig for the cluster.
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func GenerateAdmin(config GenerateAdminInput, out io.Writer) error {
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tpl, err := template.New("kubeconfig").Parse(adminKubeConfigTemplate)
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if err != nil {
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return fmt.Errorf("error parsing kubeconfig template: %w", err)
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}
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k8sCA, err := x509.NewCertificateAuthorityFromCertificateAndKey(config.CA())
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if err != nil {
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return fmt.Errorf("error getting Kubernetes CA: %w", err)
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}
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adminCert, err := x509.NewKeyPair(k8sCA,
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x509.CommonName(constants.KubernetesAdminCertCommonName),
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x509.Organization(constants.KubernetesAdminCertOrganization),
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x509.NotAfter(time.Now().Add(config.AdminKubeconfig().CertLifetime())))
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if err != nil {
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return fmt.Errorf("error generating admin certificate: %w", err)
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}
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adminCertPEM := x509.NewCertificateAndKeyFromKeyPair(adminCert)
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input := struct {
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Cluster string
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CACert string
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AdminCert string
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AdminKey string
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Server string
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}{
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Cluster: config.Name(),
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CACert: base64.StdEncoding.EncodeToString(config.CA().Crt),
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AdminCert: base64.StdEncoding.EncodeToString(adminCertPEM.Crt),
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AdminKey: base64.StdEncoding.EncodeToString(adminCertPEM.Key),
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Server: config.Endpoint().String(),
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}
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return tpl.Execute(out, input)
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}
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