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config.go
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config.go
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package server
import (
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
"time"
"github.com/hashicorp/go-multierror"
"github.com/hashicorp/hcl"
"github.com/hashicorp/hcl/hcl/ast"
)
// ReloadFunc are functions that are called when a reload is requested.
type ReloadFunc func(map[string]string) error
// Config is the configuration for the vault server.
type Config struct {
Listeners []*Listener `hcl:"-"`
Backend *Backend `hcl:"-"`
HABackend *Backend `hcl:"-"`
DisableCache bool `hcl:"disable_cache"`
DisableMlock bool `hcl:"disable_mlock"`
Telemetry *Telemetry `hcl:"telemetry"`
MaxLeaseTTL time.Duration `hcl:"-"`
MaxLeaseTTLRaw string `hcl:"max_lease_ttl"`
DefaultLeaseTTL time.Duration `hcl:"-"`
DefaultLeaseTTLRaw string `hcl:"default_lease_ttl"`
}
// DevConfig is a Config that is used for dev mode of Vault.
func DevConfig() *Config {
return &Config{
DisableCache: false,
DisableMlock: true,
Backend: &Backend{
Type: "inmem",
},
Listeners: []*Listener{
&Listener{
Type: "tcp",
Config: map[string]string{
"address": "127.0.0.1:8200",
"tls_disable": "1",
},
},
},
Telemetry: &Telemetry{},
MaxLeaseTTL: 30 * 24 * time.Hour,
DefaultLeaseTTL: 30 * 24 * time.Hour,
}
}
// Listener is the listener configuration for the server.
type Listener struct {
Type string
Config map[string]string
}
func (l *Listener) GoString() string {
return fmt.Sprintf("*%#v", *l)
}
// Backend is the backend configuration for the server.
type Backend struct {
Type string
AdvertiseAddr string
Config map[string]string
}
func (b *Backend) GoString() string {
return fmt.Sprintf("*%#v", *b)
}
// Telemetry is the telemetry configuration for the server
type Telemetry struct {
StatsiteAddr string `hcl:"statsite_address"`
StatsdAddr string `hcl:"statsd_address"`
DisableHostname bool `hcl:"disable_hostname"`
}
func (s *Telemetry) GoString() string {
return fmt.Sprintf("*%#v", *s)
}
// Merge merges two configurations.
func (c *Config) Merge(c2 *Config) *Config {
result := new(Config)
for _, l := range c.Listeners {
result.Listeners = append(result.Listeners, l)
}
for _, l := range c2.Listeners {
result.Listeners = append(result.Listeners, l)
}
result.Backend = c.Backend
if c2.Backend != nil {
result.Backend = c2.Backend
}
result.HABackend = c.HABackend
if c2.HABackend != nil {
result.HABackend = c2.HABackend
}
result.Telemetry = c.Telemetry
if c2.Telemetry != nil {
result.Telemetry = c2.Telemetry
}
// merging these booleans via an OR operation
result.DisableCache = c.DisableCache
if c2.DisableCache {
result.DisableCache = c2.DisableCache
}
result.DisableMlock = c.DisableMlock
if c2.DisableMlock {
result.DisableMlock = c2.DisableMlock
}
// merge these integers via a MAX operation
result.MaxLeaseTTL = c.MaxLeaseTTL
if c2.MaxLeaseTTL > result.MaxLeaseTTL {
result.MaxLeaseTTL = c2.MaxLeaseTTL
}
result.DefaultLeaseTTL = c.DefaultLeaseTTL
if c2.DefaultLeaseTTL > result.DefaultLeaseTTL {
result.DefaultLeaseTTL = c2.DefaultLeaseTTL
}
return result
}
// LoadConfig loads the configuration at the given path, regardless if
// its a file or directory.
func LoadConfig(path string) (*Config, error) {
fi, err := os.Stat(path)
if err != nil {
return nil, err
}
if fi.IsDir() {
return LoadConfigDir(path)
} else {
return LoadConfigFile(path)
}
}
// LoadConfigFile loads the configuration from the given file.
func LoadConfigFile(path string) (*Config, error) {
// Read the file
d, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
return ParseConfig(string(d))
}
func ParseConfig(d string) (*Config, error) {
// Parse!
obj, err := hcl.Parse(d)
if err != nil {
return nil, err
}
// Start building the result
var result Config
if err := hcl.DecodeObject(&result, obj); err != nil {
return nil, err
}
if result.MaxLeaseTTLRaw != "" {
if result.MaxLeaseTTL, err = time.ParseDuration(result.MaxLeaseTTLRaw); err != nil {
return nil, err
}
}
if result.DefaultLeaseTTLRaw != "" {
if result.DefaultLeaseTTL, err = time.ParseDuration(result.DefaultLeaseTTLRaw); err != nil {
return nil, err
}
}
list, ok := obj.Node.(*ast.ObjectList)
if !ok {
return nil, fmt.Errorf("error parsing: file doesn't contain a root object")
}
valid := []string{
"atlas",
"backend",
"ha_backend",
"listener",
"disable_cache",
"disable_mlock",
"telemetry",
"default_lease_ttl",
"max_lease_ttl",
// TODO: Remove in 0.6.0
// Deprecated keys
"statsd_addr",
"statsite_addr",
}
if err := checkHCLKeys(list, valid); err != nil {
return nil, err
}
// TODO: Remove in 0.6.0
// Preflight checks for deprecated keys
sda := list.Filter("statsd_addr")
ssa := list.Filter("statsite_addr")
if len(sda.Items) > 0 || len(ssa.Items) > 0 {
log.Println("[WARN] The top-level keys 'statsd_addr' and 'statsite_addr' " +
"have been moved into a 'telemetry' block instead. Please update your " +
"Vault configuration as this deprecation will be removed in the next " +
"major release. Values specified in a 'telemetry' block will take " +
"precendence.")
t := struct {
StatsdAddr string `hcl:"statsd_addr"`
StatsiteAddr string `hcl:"statsite_addr"`
}{}
if err := hcl.DecodeObject(&t, list); err != nil {
return nil, err
}
result.Telemetry = &Telemetry{
StatsdAddr: t.StatsdAddr,
StatsiteAddr: t.StatsiteAddr,
}
}
if o := list.Filter("backend"); len(o.Items) > 0 {
if err := parseBackends(&result, o); err != nil {
return nil, fmt.Errorf("error parsing 'backend': %s", err)
}
}
if o := list.Filter("ha_backend"); len(o.Items) > 0 {
if err := parseHABackends(&result, o); err != nil {
return nil, fmt.Errorf("error parsing 'ha_backend': %s", err)
}
}
if o := list.Filter("listener"); len(o.Items) > 0 {
if err := parseListeners(&result, o); err != nil {
return nil, fmt.Errorf("error parsing 'listener': %s", err)
}
}
if o := list.Filter("telemetry"); len(o.Items) > 0 {
if err := parseTelemetry(&result, o); err != nil {
return nil, fmt.Errorf("error parsing 'telemetry': %s", err)
}
}
return &result, nil
}
// LoadConfigDir loads all the configurations in the given directory
// in alphabetical order.
func LoadConfigDir(dir string) (*Config, error) {
f, err := os.Open(dir)
if err != nil {
return nil, err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return nil, err
}
if !fi.IsDir() {
return nil, fmt.Errorf(
"configuration path must be a directory: %s",
dir)
}
var files []string
err = nil
for err != io.EOF {
var fis []os.FileInfo
fis, err = f.Readdir(128)
if err != nil && err != io.EOF {
return nil, err
}
for _, fi := range fis {
// Ignore directories
if fi.IsDir() {
continue
}
// Only care about files that are valid to load.
name := fi.Name()
skip := true
if strings.HasSuffix(name, ".hcl") {
skip = false
} else if strings.HasSuffix(name, ".json") {
skip = false
}
if skip || isTemporaryFile(name) {
continue
}
path := filepath.Join(dir, name)
files = append(files, path)
}
}
var result *Config
for _, f := range files {
config, err := LoadConfigFile(f)
if err != nil {
return nil, fmt.Errorf("Error loading %s: %s", f, err)
}
if result == nil {
result = config
} else {
result = result.Merge(config)
}
}
return result, nil
}
// isTemporaryFile returns true or false depending on whether the
// provided file name is a temporary file for the following editors:
// emacs or vim.
func isTemporaryFile(name string) bool {
return strings.HasSuffix(name, "~") || // vim
strings.HasPrefix(name, ".#") || // emacs
(strings.HasPrefix(name, "#") && strings.HasSuffix(name, "#")) // emacs
}
func parseBackends(result *Config, list *ast.ObjectList) error {
if len(list.Items) > 1 {
return fmt.Errorf("only one 'backend' block is permitted")
}
// Get our item
item := list.Items[0]
key := "backend"
if len(item.Keys) > 0 {
key = item.Keys[0].Token.Value().(string)
}
var m map[string]string
if err := hcl.DecodeObject(&m, item.Val); err != nil {
return multierror.Prefix(err, fmt.Sprintf("backend.%s:", key))
}
// Pull out the advertise address since it's common to all backends
var advertiseAddr string
if v, ok := m["advertise_addr"]; ok {
advertiseAddr = v
delete(m, "advertise_addr")
}
result.Backend = &Backend{
AdvertiseAddr: advertiseAddr,
Type: strings.ToLower(key),
Config: m,
}
return nil
}
func parseHABackends(result *Config, list *ast.ObjectList) error {
if len(list.Items) > 1 {
return fmt.Errorf("only one 'ha_backend' block is permitted")
}
// Get our item
item := list.Items[0]
key := "backend"
if len(item.Keys) > 0 {
key = item.Keys[0].Token.Value().(string)
}
var m map[string]string
if err := hcl.DecodeObject(&m, item.Val); err != nil {
return multierror.Prefix(err, fmt.Sprintf("ha_backend.%s:", key))
}
// Pull out the advertise address since it's common to all backends
var advertiseAddr string
if v, ok := m["advertise_addr"]; ok {
advertiseAddr = v
delete(m, "advertise_addr")
}
result.HABackend = &Backend{
AdvertiseAddr: advertiseAddr,
Type: strings.ToLower(key),
Config: m,
}
return nil
}
func parseListeners(result *Config, list *ast.ObjectList) error {
var foundAtlas bool
listeners := make([]*Listener, 0, len(list.Items))
for _, item := range list.Items {
key := "listener"
if len(item.Keys) > 0 {
key = item.Keys[0].Token.Value().(string)
}
valid := []string{
"address",
"endpoint",
"infrastructure",
"node_id",
"tls_disable",
"tls_cert_file",
"tls_key_file",
"tls_min_version",
"token",
}
if err := checkHCLKeys(item.Val, valid); err != nil {
return multierror.Prefix(err, fmt.Sprintf("listeners.%s:", key))
}
var m map[string]string
if err := hcl.DecodeObject(&m, item.Val); err != nil {
return multierror.Prefix(err, fmt.Sprintf("listeners.%s:", key))
}
lnType := strings.ToLower(key)
if lnType == "atlas" {
if foundAtlas {
return multierror.Prefix(fmt.Errorf("only one listener of type 'atlas' is permitted"), fmt.Sprintf("listeners.%s", key))
}
foundAtlas = true
if m["token"] == "" {
return multierror.Prefix(fmt.Errorf("'token' must be specified for an Atlas listener"), fmt.Sprintf("listeners.%s", key))
}
if m["infrastructure"] == "" {
return multierror.Prefix(fmt.Errorf("'infrastructure' must be specified for an Atlas listener"), fmt.Sprintf("listeners.%s", key))
}
if m["node_id"] == "" {
return multierror.Prefix(fmt.Errorf("'node_id' must be specified for an Atlas listener"), fmt.Sprintf("listeners.%s", key))
}
}
listeners = append(listeners, &Listener{
Type: lnType,
Config: m,
})
}
result.Listeners = listeners
return nil
}
func parseTelemetry(result *Config, list *ast.ObjectList) error {
if len(list.Items) > 1 {
return fmt.Errorf("only one 'telemetry' block is permitted")
}
// Get our one item
item := list.Items[0]
// Check for invalid keys
valid := []string{
"statsite_address",
"statsd_address",
"disable_hostname",
}
if err := checkHCLKeys(item.Val, valid); err != nil {
return multierror.Prefix(err, "telemetry:")
}
var t Telemetry
if err := hcl.DecodeObject(&t, item.Val); err != nil {
return multierror.Prefix(err, "telemetry:")
}
if result.Telemetry == nil {
result.Telemetry = &Telemetry{}
}
if err := hcl.DecodeObject(&result.Telemetry, item.Val); err != nil {
return multierror.Prefix(err, "telemetry:")
}
return nil
}
func checkHCLKeys(node ast.Node, valid []string) error {
var list *ast.ObjectList
switch n := node.(type) {
case *ast.ObjectList:
list = n
case *ast.ObjectType:
list = n.List
default:
return fmt.Errorf("cannot check HCL keys of type %T", n)
}
validMap := make(map[string]struct{}, len(valid))
for _, v := range valid {
validMap[v] = struct{}{}
}
var result error
for _, item := range list.Items {
key := item.Keys[0].Token.Value().(string)
if _, ok := validMap[key]; !ok {
result = multierror.Append(result, fmt.Errorf(
"invalid key '%s' on line %d", key, item.Assign.Line))
}
}
return result
}