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render.go
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render.go
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package main
import (
"crypto/rsa"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"net"
"net/url"
"strings"
"github.com/spf13/cobra"
"github.com/coreos/bootkube/pkg/asset"
"github.com/coreos/bootkube/pkg/tlsutil"
)
var (
cmdRender = &cobra.Command{
Use: "render",
Short: "Render default cluster manifests",
Long: "",
PreRunE: validateRenderOpts,
RunE: runCmdRender,
SilenceUsage: true,
}
renderOpts struct {
assetDir string
caCertificatePath string
caPrivateKeyPath string
etcdServers string
apiServers string
altNames string
}
)
func init() {
cmdRoot.AddCommand(cmdRender)
cmdRender.Flags().StringVar(&renderOpts.assetDir, "asset-dir", "", "Output path for rendered assets")
cmdRender.Flags().StringVar(&renderOpts.caCertificatePath, "ca-certificate-path", "", "Path to an existing PEM encoded CA. If provided, TLS assets will be generated using this certificate authority.")
cmdRender.Flags().StringVar(&renderOpts.caPrivateKeyPath, "ca-private-key-path", "", "Path to an existing Certificate Authority RSA private key. Required if --ca-certificate is set.")
cmdRender.Flags().StringVar(&renderOpts.etcdServers, "etcd-servers", "http://127.0.0.1:2379", "List of etcd servers URLs including host:port, comma separated")
cmdRender.Flags().StringVar(&renderOpts.apiServers, "api-servers", "https://127.0.0.1:443", "List of API server URLs including host:port, commma seprated")
cmdRender.Flags().StringVar(&renderOpts.altNames, "api-server-alt-names", "", "List of SANs to use in api-server certificate. Example: 'IP=127.0.0.1,IP=127.0.0.2,DNS=localhost'. If empty, SANs will be extracted from the --api-servers flag.")
}
func runCmdRender(cmd *cobra.Command, args []string) error {
config, err := flagsToAssetConfig()
if err != nil {
return err
}
as, err := asset.NewDefaultAssets(*config)
if err != nil {
return err
}
return as.WriteFiles(renderOpts.assetDir)
}
func validateRenderOpts(cmd *cobra.Command, args []string) error {
if renderOpts.caCertificatePath != "" && renderOpts.caPrivateKeyPath == "" {
return errors.New("You must provide the --ca-private-key-path flag when --ca-certificate-path is provided.")
}
if renderOpts.caPrivateKeyPath != "" && renderOpts.caCertificatePath == "" {
return errors.New("You must provide the --ca-certificate-path flag when --ca-private-key-path is provided.")
}
if renderOpts.assetDir == "" {
return errors.New("Missing required flag: --asset-dir")
}
if renderOpts.etcdServers == "" {
return errors.New("Missing required flag: --etcd-servers")
}
if renderOpts.apiServers == "" {
return errors.New("Missing requried flag: --api-servers")
}
return nil
}
func flagsToAssetConfig() (c *asset.Config, err error) {
etcdServers, err := parseURLs(renderOpts.etcdServers)
if err != nil {
return nil, err
}
apiServers, err := parseURLs(renderOpts.apiServers)
if err != nil {
return nil, err
}
altNames, err := parseAltNames(renderOpts.altNames)
if err != nil {
return nil, err
}
if altNames == nil {
// Fall back to parsing from api-server list
altNames = altNamesFromURLs(apiServers)
}
var caCert *x509.Certificate
var caPrivKey *rsa.PrivateKey
if renderOpts.caCertificatePath != "" {
caPrivKey, caCert, err = parseCertAndPrivateKeyFromDisk(renderOpts.caCertificatePath, renderOpts.caPrivateKeyPath)
if err != nil {
return nil, err
}
}
return &asset.Config{
EtcdServers: etcdServers,
CACert: caCert,
CAPrivKey: caPrivKey,
APIServers: apiServers,
AltNames: altNames,
}, nil
}
func parseCertAndPrivateKeyFromDisk(caCertPath, privKeyPath string) (*rsa.PrivateKey, *x509.Certificate, error) {
// Parse CA Private key.
keypem, err := ioutil.ReadFile(privKeyPath)
if err != nil {
return nil, nil, fmt.Errorf("error reading ca private key file at %s: %v", privKeyPath, err)
}
key, err := tlsutil.ParsePEMEncodedPrivateKey(keypem)
if err != nil {
return nil, nil, fmt.Errorf("unable to parse CA private key: %v", err)
}
// Parse CA Cert.
capem, err := ioutil.ReadFile(caCertPath)
if err != nil {
return nil, nil, fmt.Errorf("error reading ca cert file at %s: %v", caCertPath, err)
}
cert, err := tlsutil.ParsePEMEncodedCACert(capem)
if err != nil {
return nil, nil, fmt.Errorf("unable to parse CA Cert: %v", err)
}
return key, cert, nil
}
func parseURLs(s string) ([]*url.URL, error) {
var out []*url.URL
for _, u := range strings.Split(s, ",") {
parsed, err := url.Parse(u)
if err != nil {
return nil, err
}
out = append(out, parsed)
}
return out, nil
}
func parseAltNames(s string) (*tlsutil.AltNames, error) {
if s == "" {
return nil, nil
}
var alt tlsutil.AltNames
for _, an := range strings.Split(s, ",") {
switch {
case strings.HasPrefix(an, "DNS="):
alt.DNSNames = append(alt.DNSNames, strings.TrimPrefix(an, "DNS="))
case strings.HasPrefix(an, "IP="):
ip := net.ParseIP(strings.TrimPrefix(an, "IP="))
if ip == nil {
return nil, fmt.Errorf("Invalid IP alt name: %s", an)
}
alt.IPs = append(alt.IPs, ip)
default:
return nil, fmt.Errorf("Invalid alt name: %s", an)
}
}
return &alt, nil
}
func altNamesFromURLs(urls []*url.URL) *tlsutil.AltNames {
var an tlsutil.AltNames
for _, u := range urls {
host, _, err := net.SplitHostPort(u.Host)
if err != nil {
host = u.Host
}
ip := net.ParseIP(host)
if ip == nil {
an.DNSNames = append(an.DNSNames, host)
} else {
an.IPs = append(an.IPs, ip)
}
}
return &an
}