forked from Caiyeon/goldfish
/
config.go
304 lines (261 loc) · 7.3 KB
/
config.go
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package config
import (
"errors"
"fmt"
"io/ioutil"
"net/url"
"strings"
"github.com/hashicorp/hcl"
"github.com/hashicorp/hcl/hcl/ast"
"github.com/hashicorp/vault/helper/parseutil"
)
var ch = make(chan error)
type Config struct {
Listener *ListenerConfig `hcl:"-"`
Vault *VaultConfig `hcl:"-"`
DisableMlock bool `hcl:"-"`
DisableMlockRaw interface{} `hcl:"disable_mlock"`
}
type ListenerConfig struct {
Type string
Address string
Tls_disable bool
Tls_cert_file string
Tls_key_file string
Tls_autoredirect bool
}
type VaultConfig struct {
Type string
Address string
Tls_skip_verify bool
Runtime_config string
Approle_login string
Approle_id string
}
func LoadConfigFile(path string) (*Config, error) {
if path == "" {
return nil, errors.New("[ERROR]: Config file not specified")
}
d, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
return ParseConfig(string(d))
}
func LoadConfigDev() (*Config, chan struct{}, string, error) {
// start a vault dev instance
shutdownCh := initDevVaultCore()
// setup local vault instance with required mounts
err := setupVault("http://127.0.0.1:8200", "goldfish")
if err != nil {
return nil, nil, "", err
}
// setup goldfish internal config
u, _ := url.Parse("http://127.0.0.1:8200")
result := Config{
Listener: &ListenerConfig{
Type: "tcp",
Address: "127.0.0.1:8000",
Tls_disable: true,
},
Vault: &VaultConfig{
Type: "vault",
Address: u.String(),
Runtime_config: "secret/goldfish",
Approle_login: "auth/approle/login",
Approle_id: "goldfish",
},
DisableMlock: true,
}
// generate an approle secret ID
secretID, err := generateWrappedSecretID(*result.Vault, "goldfish")
if err != nil {
return nil, nil, "", err
}
return &result, shutdownCh, secretID, nil
}
func ParseConfig(d string) (*Config, error) {
// parse as hcl
obj, err := hcl.Parse(d)
if err != nil {
return nil, err
}
// make a new config and decode hcl
result := Config{
Listener: &ListenerConfig{},
Vault: &VaultConfig{},
}
if err := hcl.DecodeObject(&result, obj); err != nil {
return nil, err
}
// config file should have a root object
list, ok := obj.Node.(*ast.ObjectList)
if !ok {
return nil, errors.New("[ERROR]: Config file doesn't have a root object")
}
// perform checks on root config keys
if result.DisableMlockRaw != nil {
if result.DisableMlock, err = parseutil.ParseBool(result.DisableMlockRaw); err != nil {
return nil, err
}
}
// config root object should contain only this set of keys
valid := []string{
"listener",
"vault",
"disable_mlock",
}
if err := checkHCLKeys(list, valid); err != nil {
return nil, err
}
// build each specific config component
if object := list.Filter("listener"); len(object.Items) != 1 {
return nil, fmt.Errorf("Config requires exactly one 'listener' object")
} else {
// there should be only one listener to parse
if err := parseListener(&result, object.Items[0]); err != nil {
return nil, fmt.Errorf("Error parsing 'listener': %s", err.Error())
}
}
if object := list.Filter("vault"); len(object.Items) != 1 {
return nil, fmt.Errorf("Config requires exactly one 'vault' object")
} else {
// there should be only one vault to parse
if err := parseVault(&result, object.Items[0]); err != nil {
return nil, fmt.Errorf("Error parsing 'vault': %s", err.Error())
}
}
return &result, 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 recognize HCL key type %T", n)
}
validMap := make(map[string]struct{}, len(valid))
for _, v := range valid {
validMap[v] = struct{}{}
}
var err error
for _, item := range list.Items {
key := item.Keys[0].Token.Value().(string)
if _, ok := validMap[key]; !ok {
err = fmt.Errorf("Invalid key '%s' on line '%d'", key, item.Assign.Line)
ch <- err
}
}
return err
}
func parseListener(result *Config, listener *ast.ObjectItem) error {
key := "listener"
if len(listener.Keys) > 0 {
key = listener.Keys[0].Token.Value().(string)
}
valid := []string{
"address",
"tls_disable",
"tls_cert_file",
"tls_key_file",
"tls_autoredirect",
}
if err := checkHCLKeys(listener.Val, valid); err != nil {
return fmt.Errorf("listener.%s: %s", key, err.Error())
}
var m map[string]string
if err := hcl.DecodeObject(&m, listener.Val); err != nil {
return fmt.Errorf("listener.%s: %s", key, err.Error())
}
// check and enforce field values
result.Listener.Type = strings.ToLower(key)
if address, ok := m["address"]; !ok || address == "" {
return fmt.Errorf("listener.%s: address is required", key)
} else {
result.Listener.Address = address
}
if certFile, ok := m["tls_cert_file"]; ok {
result.Listener.Tls_cert_file = certFile
}
if keyFile, ok := m["tls_key_file"]; ok {
result.Listener.Tls_key_file = keyFile
}
if tlsDisable, ok := m["tls_disable"]; ok {
if tlsDisable == "1" {
result.Listener.Tls_disable = true
} else if tlsDisable != "0" {
return fmt.Errorf("listener.%s: tls_disable can be 0 or 1", key)
}
}
if redirect, ok := m["tls_autoredirect"]; ok {
if redirect == "1" {
if result.Listener.Tls_disable {
return fmt.Errorf("listener.%s: tls_autoredirect conflicts with tls_disable", key)
}
result.Listener.Tls_autoredirect = true
} else if redirect != "0" {
return fmt.Errorf("listener.%s: tls_autoredirect can be 0 or 1", key)
}
}
return nil
}
func parseVault(result *Config, vault *ast.ObjectItem) error {
key := "vault"
if len(vault.Keys) > 0 {
key = vault.Keys[0].Token.Value().(string)
}
valid := []string{
"address",
"tls_skip_verify",
"runtime_config",
"approle_login",
"approle_id",
}
if err := checkHCLKeys(vault.Val, valid); err != nil {
return fmt.Errorf("vault.%s: %s", key, err.Error())
}
var m map[string]string
if err := hcl.DecodeObject(&m, vault.Val); err != nil {
return fmt.Errorf("vault.%s: %s", key, err.Error())
}
// check and enforce field values, possibly writing default values
result.Vault.Type = strings.ToLower(key)
if address, ok := m["address"]; !ok || address == "" {
return fmt.Errorf("vault.%s: address is required", key)
} else {
if url, err := url.Parse(address); err != nil {
return fmt.Errorf("failed to set address %v reason: %s", address, err.Error())
} else {
if !(url.Scheme == "http" || url.Scheme == "https") {
return fmt.Errorf("vault.%s: address must be prefixed with scheme i.e. http:// or https://", key)
}
result.Vault.Address = url.String()
}
}
if tlsSkip, ok := m["tls_skip_verify"]; ok {
if tlsSkip == "1" {
result.Vault.Tls_skip_verify = true
} else if tlsSkip != "0" {
return fmt.Errorf("listener.%s: tls_disable can be 0 or 1", key)
}
}
if runtimeConfig, ok := m["runtime_config"]; ok {
result.Vault.Runtime_config = runtimeConfig
} else {
result.Vault.Runtime_config = "secret/goldfish"
}
if login, ok := m["approle_login"]; ok {
result.Vault.Approle_login = login
} else {
result.Vault.Approle_login = "auth/approle/login"
}
if id, ok := m["approle_id"]; ok {
result.Vault.Approle_id = id
} else {
result.Vault.Approle_id = "goldfish"
}
return nil
}