152 lines
3.8 KiB
Go
152 lines
3.8 KiB
Go
package agent
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import (
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"encoding/base64"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/hashicorp/consul/consul/structs"
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"github.com/hashicorp/memberlist"
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"github.com/hashicorp/serf/serf"
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)
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const (
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serfLANKeyring = "serf/local.keyring"
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serfWANKeyring = "serf/remote.keyring"
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)
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// initKeyring will create a keyring file at a given path.
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func initKeyring(path, key string) error {
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var keys []string
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if keyBytes, err := base64.StdEncoding.DecodeString(key); err != nil {
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return fmt.Errorf("Invalid key: %s", err)
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} else if err := memberlist.ValidateKey(keyBytes); err != nil {
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return fmt.Errorf("Invalid key: %s", err)
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}
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// Just exit if the file already exists.
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if _, err := os.Stat(path); err == nil {
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return nil
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}
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keys = append(keys, key)
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keyringBytes, err := json.Marshal(keys)
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if err != nil {
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return err
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}
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if err := os.MkdirAll(filepath.Dir(path), 0700); err != nil {
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return err
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}
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fh, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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defer fh.Close()
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if _, err := fh.Write(keyringBytes); err != nil {
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os.Remove(path)
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return err
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}
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return nil
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}
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// loadKeyringFile will load a gossip encryption keyring out of a file. The file
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// must be in JSON format and contain a list of encryption key strings.
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func loadKeyringFile(c *serf.Config) error {
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if c.KeyringFile == "" {
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return nil
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}
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if _, err := os.Stat(c.KeyringFile); err != nil {
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return err
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}
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// Read in the keyring file data
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keyringData, err := ioutil.ReadFile(c.KeyringFile)
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if err != nil {
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return err
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}
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// Decode keyring JSON
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keys := make([]string, 0)
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if err := json.Unmarshal(keyringData, &keys); err != nil {
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return err
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}
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// Decode base64 values
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keysDecoded := make([][]byte, len(keys))
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for i, key := range keys {
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keyBytes, err := base64.StdEncoding.DecodeString(key)
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if err != nil {
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return err
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}
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keysDecoded[i] = keyBytes
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}
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// Guard against empty keyring
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if len(keysDecoded) == 0 {
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return fmt.Errorf("no keys present in keyring file: %s", c.KeyringFile)
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}
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// Create the keyring
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keyring, err := memberlist.NewKeyring(keysDecoded, keysDecoded[0])
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if err != nil {
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return err
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}
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c.MemberlistConfig.Keyring = keyring
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// Success!
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return nil
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}
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// keyringProcess is used to abstract away the semantic similarities in
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// performing various operations on the encryption keyring.
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func (a *Agent) keyringProcess(args *structs.KeyringRequest) (*structs.KeyringResponses, error) {
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var reply structs.KeyringResponses
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if a.server == nil {
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return nil, fmt.Errorf("keyring operations must run against a server node")
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}
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if err := a.RPC("Internal.KeyringOperation", args, &reply); err != nil {
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return &reply, err
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}
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return &reply, nil
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}
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// ListKeys lists out all keys installed on the collective Consul cluster. This
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// includes both servers and clients in all DC's.
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func (a *Agent) ListKeys(token string) (*structs.KeyringResponses, error) {
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args := structs.KeyringRequest{Operation: structs.KeyringList}
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args.Token = token
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return a.keyringProcess(&args)
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}
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// InstallKey installs a new gossip encryption key
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func (a *Agent) InstallKey(key, token string) (*structs.KeyringResponses, error) {
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args := structs.KeyringRequest{Key: key, Operation: structs.KeyringInstall}
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args.Token = token
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return a.keyringProcess(&args)
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}
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// UseKey changes the primary encryption key used to encrypt messages
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func (a *Agent) UseKey(key, token string) (*structs.KeyringResponses, error) {
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args := structs.KeyringRequest{Key: key, Operation: structs.KeyringUse}
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args.Token = token
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return a.keyringProcess(&args)
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}
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// RemoveKey will remove a gossip encryption key from the keyring
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func (a *Agent) RemoveKey(key, token string) (*structs.KeyringResponses, error) {
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args := structs.KeyringRequest{Key: key, Operation: structs.KeyringRemove}
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args.Token = token
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return a.keyringProcess(&args)
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}
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