mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-10-18 23:45:08 +00:00
118 lines
3.2 KiB
Go
118 lines
3.2 KiB
Go
// Copyright 2024 Google LLC
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package cert
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import (
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"crypto/tls"
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"encoding/json"
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"errors"
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"io"
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"os"
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"github.com/googleapis/enterprise-certificate-proxy/client/util"
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)
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type certConfigs struct {
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Workload *workloadSource `json:"workload"`
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}
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type workloadSource struct {
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CertPath string `json:"cert_path"`
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KeyPath string `json:"key_path"`
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}
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type certificateConfig struct {
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CertConfigs certConfigs `json:"cert_configs"`
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}
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// NewWorkloadX509CertProvider creates a certificate source
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// that reads a certificate and private key file from the local file system.
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// This is intended to be used for workload identity federation.
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//
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// The configFilePath points to a config file containing relevant parameters
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// such as the certificate and key file paths.
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// If configFilePath is empty, the client will attempt to load the config from
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// a well-known gcloud location.
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func NewWorkloadX509CertProvider(configFilePath string) (Provider, error) {
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if configFilePath == "" {
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envFilePath := util.GetConfigFilePathFromEnv()
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if envFilePath != "" {
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configFilePath = envFilePath
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} else {
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configFilePath = util.GetDefaultConfigFilePath()
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}
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}
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certFile, keyFile, err := getCertAndKeyFiles(configFilePath)
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if err != nil {
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return nil, err
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}
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source := &workloadSource{
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CertPath: certFile,
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KeyPath: keyFile,
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}
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return source.getClientCertificate, nil
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}
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// getClientCertificate attempts to load the certificate and key from the files specified in the
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// certificate config.
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func (s *workloadSource) getClientCertificate(info *tls.CertificateRequestInfo) (*tls.Certificate, error) {
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cert, err := tls.LoadX509KeyPair(s.CertPath, s.KeyPath)
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if err != nil {
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return nil, err
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}
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return &cert, nil
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}
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// getCertAndKeyFiles attempts to read the provided config file and return the certificate and private
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// key file paths.
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func getCertAndKeyFiles(configFilePath string) (string, string, error) {
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jsonFile, err := os.Open(configFilePath)
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if err != nil {
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if errors.Is(err, os.ErrNotExist) {
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return "", "", errSourceUnavailable
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}
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return "", "", err
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}
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byteValue, err := io.ReadAll(jsonFile)
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if err != nil {
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return "", "", err
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}
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var config certificateConfig
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if err := json.Unmarshal(byteValue, &config); err != nil {
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return "", "", err
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}
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if config.CertConfigs.Workload == nil {
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return "", "", errSourceUnavailable
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}
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certFile := config.CertConfigs.Workload.CertPath
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keyFile := config.CertConfigs.Workload.KeyPath
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if certFile == "" {
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return "", "", errors.New("certificate configuration is missing the certificate file location")
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}
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if keyFile == "" {
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return "", "", errors.New("certificate configuration is missing the key file location")
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}
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return certFile, keyFile, nil
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}
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