113 lines
3.9 KiB
Go
113 lines
3.9 KiB
Go
/*
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Copyright 2015 Home Office All rights reserved.
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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 main
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"net/url"
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"time"
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"github.com/golang/glog"
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)
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// config ... the command line configuration
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type config struct {
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// the url for th vault server
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vaultURL string
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// the token to connect to vault with
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vaultToken string
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// a file / path containing a token for vault
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vaultTokenFile string
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// the place to write the resources
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secretsDirectory string
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// whether of not to remove the token post connection
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deleteToken bool
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// switch on dry run
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dryRun bool
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// the resource items to retrieve
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resources *vaultResources
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// the interval for producing statistics
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statsInterval time.Duration
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}
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var (
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options config
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)
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func init() {
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options.resources = new(vaultResources)
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flag.StringVar(&options.vaultURL, "vault", getEnv("VAULT_ADDR", "https://127.0.0.1:8200"), "the url the vault service is running behind (VAULT_ADDR if available)")
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flag.StringVar(&options.vaultToken, "token", "", "the token used to authenticate to teh vault service (VAULT_TOKEN if available)")
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flag.StringVar(&options.vaultTokenFile, "tokenfile", getEnv("VAULT_TOKEN_FILE", ""), "the full path to file containing the vault token used for authentication (VAULT_TOKEN_FILE if available)")
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flag.StringVar(&options.secretsDirectory, "output", getEnv("VAULT_OUTPUT", "/etc/secrets"), "the full path to write the protected resources (VAULT_OUTPUT if available)")
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flag.BoolVar(&options.deleteToken, "delete-token", false, "once the we have connected to vault, delete the token file from disk")
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flag.BoolVar(&options.dryRun, "dry-run", false, "perform a dry run, printing the content to screen")
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flag.DurationVar(&options.statsInterval, "stats", time.Duration(5)*time.Minute, "the interval to produce statistics on the accessed resources")
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flag.Var(options.resources, "cn", "a resource to retrieve and monitor from vault (e.g. pki:name:cert.name, secret:db_password, aws:s3_backup)")
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}
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// parseOptions ... validate the command line options and validates them
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func parseOptions() error {
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flag.Parse()
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return validateOptions(&options)
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}
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// validateOptions ... parses and validates the command line options
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func validateOptions(cfg *config) error {
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// step: validate the vault url
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url, err := url.Parse(cfg.vaultURL)
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if err != nil {
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return fmt.Errorf("invalid vault url: '%s' specified", cfg.vaultURL)
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}
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// step: ensure the protocol scheme
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if url.Scheme != "https" {
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glog.Warningf("protocol scheme: %s is not secure and should be https", url.Scheme)
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}
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// step: check if the token is in the VAULT_TOKEN var
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if cfg.vaultToken == "" {
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cfg.vaultToken = getEnv("VAULT_TOKEN", "")
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}
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// step: ensure we have a token
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if cfg.vaultToken == "" && cfg.vaultTokenFile == "" {
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return fmt.Errorf("you have not either a token or a token file to authenticate with")
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}
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// step: read in the token if required
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if cfg.vaultTokenFile != "" {
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exists, err := fileExists(cfg.vaultTokenFile)
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if !exists {
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return fmt.Errorf("the token file: %s does not exists, please check", cfg.vaultTokenFile)
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}
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if err != nil {
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return fmt.Errorf("unable to check for token file: %s, error: %s", cfg.vaultTokenFile, err)
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}
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// step: read in the token
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content, err := ioutil.ReadFile(cfg.vaultTokenFile)
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if err != nil {
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return fmt.Errorf("unable to read in token from file: %s, error: %s", cfg.vaultTokenFile, err)
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}
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cfg.vaultToken = string(content)
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}
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return nil
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}
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