mirror of
https://github.com/gravitational/teleport
synced 2024-10-21 17:53:28 +00:00
147 lines
4.1 KiB
Go
147 lines
4.1 KiB
Go
/*
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Copyright 2017 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package license
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import (
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"crypto/tls"
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"crypto/x509"
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"encoding/pem"
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"github.com/gravitational/license/constants"
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"github.com/gravitational/trace"
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)
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// ParseLicensePEM parses license PEM, parses payload on demand
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func ParseLicensePEM(pem []byte) (*License, error) {
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certPEM, keyPEM, err := SplitPEM([]byte(pem))
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if err != nil {
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return nil, trace.Wrap(err)
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}
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certificateBytes, _, err := parseCertificatePEM(string(pem))
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if err != nil {
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return nil, trace.Wrap(err)
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}
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certificate, err := x509.ParseCertificate(certificateBytes)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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rawPayload, err := getRawPayloadFromX509(certificate)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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license := License{
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Cert: certificate,
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CertPEM: certPEM,
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KeyPEM: keyPEM,
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RawPayload: rawPayload,
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}
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return &license, nil
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}
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// ParseX509 parses the license from the provided x509 certificate
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func ParseX509(cert *x509.Certificate) (*License, error) {
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rawPayload, err := getRawPayloadFromX509(cert)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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license := License{
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Cert: cert,
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RawPayload: rawPayload,
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}
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return &license, nil
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}
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// MakeTLSCert takes the provided license and makes a TLS certificate
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// which is the format used by Go servers
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func MakeTLSCert(license License) (*tls.Certificate, error) {
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tlsCert, err := tls.X509KeyPair(license.CertPEM, license.KeyPEM)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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return &tlsCert, nil
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}
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// MakeTLSConfig builds a client TLS config from the supplied license
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func MakeTLSConfig(license License) (*tls.Config, error) {
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tlsCert, err := MakeTLSCert(license)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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return &tls.Config{
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Certificates: []tls.Certificate{*tlsCert},
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}, nil
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}
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// getRawPayloadFromX509 returns the payload in the extension of the
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// provided x509 certificate
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func getRawPayloadFromX509(cert *x509.Certificate) ([]byte, error) {
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for _, ext := range cert.Extensions {
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if ext.Id.Equal(constants.LicenseASN1ExtensionID) {
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return ext.Value, nil
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}
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}
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return nil, trace.NotFound(
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"certificate does not contain extension with license payload")
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}
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// parseCertificatePEM parses the concatenated certificate/private key in PEM format
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// and returns certificate and private key in decoded DER ASN.1 structure
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func parseCertificatePEM(certPEM string) ([]byte, []byte, error) {
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var certificateBytes, privateBytes []byte
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block, rest := pem.Decode([]byte(certPEM))
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for block != nil {
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switch block.Type {
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case constants.CertificatePEMBlock:
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certificateBytes = block.Bytes
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case constants.RSAPrivateKeyPEMBlock:
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privateBytes = block.Bytes
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}
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// parse the next block
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block, rest = pem.Decode(rest)
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}
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if len(certificateBytes) == 0 || len(privateBytes) == 0 {
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return nil, nil, trace.BadParameter("could not parse the license")
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}
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return certificateBytes, privateBytes, nil
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}
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// SplitPEM splits the provided PEM data that contains concatenated cert and key
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// (in any order) into cert PEM and key PEM respectively. Returns an error if
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// any of them is missing
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func SplitPEM(pemData []byte) (certPEM []byte, keyPEM []byte, err error) {
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block, rest := pem.Decode(pemData)
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for block != nil {
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switch block.Type {
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case constants.CertificatePEMBlock:
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certPEM = pem.EncodeToMemory(block)
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case constants.RSAPrivateKeyPEMBlock:
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keyPEM = pem.EncodeToMemory(block)
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}
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block, rest = pem.Decode(rest)
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}
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if len(certPEM) == 0 || len(keyPEM) == 0 {
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return nil, nil, trace.BadParameter("cert or key PEM data is missing")
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}
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return certPEM, keyPEM, nil
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}
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