109 lines
2.7 KiB
Go
109 lines
2.7 KiB
Go
package pluginutil
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import (
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"context"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"time"
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"github.com/hashicorp/errwrap"
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"github.com/hashicorp/go-uuid"
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"github.com/hashicorp/vault/sdk/helper/certutil"
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)
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// generateCert is used internally to create certificates for the plugin
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// client and server.
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func generateCert() ([]byte, *ecdsa.PrivateKey, error) {
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key, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
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if err != nil {
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return nil, nil, err
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}
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host, err := uuid.GenerateUUID()
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if err != nil {
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return nil, nil, err
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}
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sn, err := certutil.GenerateSerialNumber()
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if err != nil {
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return nil, nil, err
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}
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template := &x509.Certificate{
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Subject: pkix.Name{
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CommonName: host,
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},
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DNSNames: []string{host},
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ExtKeyUsage: []x509.ExtKeyUsage{
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x509.ExtKeyUsageClientAuth,
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x509.ExtKeyUsageServerAuth,
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},
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KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment | x509.KeyUsageKeyAgreement,
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SerialNumber: sn,
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NotBefore: time.Now().Add(-30 * time.Second),
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NotAfter: time.Now().Add(262980 * time.Hour),
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IsCA: true,
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}
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certBytes, err := x509.CreateCertificate(rand.Reader, template, template, key.Public(), key)
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if err != nil {
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return nil, nil, errwrap.Wrapf("unable to generate client certificate: {{err}}", err)
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}
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return certBytes, key, nil
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}
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// createClientTLSConfig creates a signed certificate and returns a configured
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// TLS config.
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func createClientTLSConfig(certBytes []byte, key *ecdsa.PrivateKey) (*tls.Config, error) {
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clientCert, err := x509.ParseCertificate(certBytes)
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if err != nil {
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return nil, errwrap.Wrapf("error parsing generated plugin certificate: {{err}}", err)
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}
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cert := tls.Certificate{
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Certificate: [][]byte{certBytes},
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PrivateKey: key,
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Leaf: clientCert,
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}
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clientCertPool := x509.NewCertPool()
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clientCertPool.AddCert(clientCert)
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tlsConfig := &tls.Config{
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Certificates: []tls.Certificate{cert},
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RootCAs: clientCertPool,
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ClientCAs: clientCertPool,
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ClientAuth: tls.RequireAndVerifyClientCert,
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ServerName: clientCert.Subject.CommonName,
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MinVersion: tls.VersionTLS12,
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}
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tlsConfig.BuildNameToCertificate()
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return tlsConfig, nil
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}
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// wrapServerConfig is used to create a server certificate and private key, then
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// wrap them in an unwrap token for later retrieval by the plugin.
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func wrapServerConfig(ctx context.Context, sys RunnerUtil, certBytes []byte, key *ecdsa.PrivateKey) (string, error) {
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rawKey, err := x509.MarshalECPrivateKey(key)
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if err != nil {
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return "", err
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}
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wrapInfo, err := sys.ResponseWrapData(ctx, map[string]interface{}{
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"ServerCert": certBytes,
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"ServerKey": rawKey,
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}, time.Second*60, true)
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if err != nil {
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return "", err
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}
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return wrapInfo.Token, nil
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}
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