87350f927f
* agent/auto-auth: add exit_on_err configurable * changelog * Update backoff function to quit * Clarify doc * Fix test
755 lines
20 KiB
Go
755 lines
20 KiB
Go
package config
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import (
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"context"
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"errors"
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"strings"
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"time"
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ctconfig "github.com/hashicorp/consul-template/config"
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"github.com/hashicorp/go-multierror"
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"github.com/hashicorp/go-secure-stdlib/parseutil"
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"github.com/hashicorp/hcl"
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"github.com/hashicorp/hcl/hcl/ast"
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"github.com/hashicorp/vault/helper/namespace"
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"github.com/hashicorp/vault/internalshared/configutil"
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"github.com/mitchellh/mapstructure"
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)
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// Config is the configuration for the vault server.
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type Config struct {
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*configutil.SharedConfig `hcl:"-"`
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AutoAuth *AutoAuth `hcl:"auto_auth"`
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ExitAfterAuth bool `hcl:"exit_after_auth"`
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Cache *Cache `hcl:"cache"`
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Vault *Vault `hcl:"vault"`
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TemplateConfig *TemplateConfig `hcl:"template_config"`
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Templates []*ctconfig.TemplateConfig `hcl:"templates"`
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DisableIdleConns []string `hcl:"disable_idle_connections"`
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DisableIdleConnsCaching bool `hcl:"-"`
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DisableIdleConnsTemplating bool `hcl:"-"`
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DisableIdleConnsAutoAuth bool `hcl:"-"`
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DisableKeepAlives []string `hcl:"disable_keep_alives"`
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DisableKeepAlivesCaching bool `hcl:"-"`
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DisableKeepAlivesTemplating bool `hcl:"-"`
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DisableKeepAlivesAutoAuth bool `hcl:"-"`
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}
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const (
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DisableIdleConnsEnv = "VAULT_AGENT_DISABLE_IDLE_CONNECTIONS"
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DisableKeepAlivesEnv = "VAULT_AGENT_DISABLE_KEEP_ALIVES"
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)
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func (c *Config) Prune() {
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for _, l := range c.Listeners {
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l.RawConfig = nil
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l.Profiling.UnusedKeys = nil
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l.Telemetry.UnusedKeys = nil
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l.CustomResponseHeaders = nil
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}
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c.FoundKeys = nil
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c.UnusedKeys = nil
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c.SharedConfig.FoundKeys = nil
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c.SharedConfig.UnusedKeys = nil
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if c.Telemetry != nil {
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c.Telemetry.FoundKeys = nil
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c.Telemetry.UnusedKeys = nil
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}
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}
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type Retry struct {
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NumRetries int `hcl:"num_retries"`
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}
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// Vault contains configuration for connecting to Vault servers
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type Vault struct {
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Address string `hcl:"address"`
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CACert string `hcl:"ca_cert"`
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CAPath string `hcl:"ca_path"`
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TLSSkipVerify bool `hcl:"-"`
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TLSSkipVerifyRaw interface{} `hcl:"tls_skip_verify"`
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ClientCert string `hcl:"client_cert"`
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ClientKey string `hcl:"client_key"`
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TLSServerName string `hcl:"tls_server_name"`
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Retry *Retry `hcl:"retry"`
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}
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// transportDialer is an interface that allows passing a custom dialer function
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// to an HTTP client's transport config
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type transportDialer interface {
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// Dial is intended to match https://pkg.go.dev/net#Dialer.Dial
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Dial(network, address string) (net.Conn, error)
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// DialContext is intended to match https://pkg.go.dev/net#Dialer.DialContext
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DialContext(ctx context.Context, network, address string) (net.Conn, error)
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}
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// Cache contains any configuration needed for Cache mode
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type Cache struct {
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UseAutoAuthTokenRaw interface{} `hcl:"use_auto_auth_token"`
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UseAutoAuthToken bool `hcl:"-"`
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ForceAutoAuthToken bool `hcl:"-"`
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EnforceConsistency string `hcl:"enforce_consistency"`
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WhenInconsistent string `hcl:"when_inconsistent"`
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Persist *Persist `hcl:"persist"`
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InProcDialer transportDialer `hcl:"-"`
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}
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// Persist contains configuration needed for persistent caching
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type Persist struct {
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Type string
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Path string `hcl:"path"`
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KeepAfterImport bool `hcl:"keep_after_import"`
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ExitOnErr bool `hcl:"exit_on_err"`
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ServiceAccountTokenFile string `hcl:"service_account_token_file"`
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}
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// AutoAuth is the configured authentication method and sinks
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type AutoAuth struct {
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Method *Method `hcl:"-"`
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Sinks []*Sink `hcl:"sinks"`
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// NOTE: This is unsupported outside of testing and may disappear at any
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// time.
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EnableReauthOnNewCredentials bool `hcl:"enable_reauth_on_new_credentials"`
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}
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// Method represents the configuration for the authentication backend
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type Method struct {
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Type string
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MountPath string `hcl:"mount_path"`
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WrapTTLRaw interface{} `hcl:"wrap_ttl"`
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WrapTTL time.Duration `hcl:"-"`
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MinBackoffRaw interface{} `hcl:"min_backoff"`
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MinBackoff time.Duration `hcl:"-"`
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MaxBackoffRaw interface{} `hcl:"max_backoff"`
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MaxBackoff time.Duration `hcl:"-"`
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Namespace string `hcl:"namespace"`
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ExitOnError bool `hcl:"exit_on_err"`
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Config map[string]interface{}
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}
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// Sink defines a location to write the authenticated token
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type Sink struct {
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Type string
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WrapTTLRaw interface{} `hcl:"wrap_ttl"`
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WrapTTL time.Duration `hcl:"-"`
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DHType string `hcl:"dh_type"`
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DeriveKey bool `hcl:"derive_key"`
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DHPath string `hcl:"dh_path"`
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AAD string `hcl:"aad"`
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AADEnvVar string `hcl:"aad_env_var"`
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Config map[string]interface{}
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}
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// TemplateConfig defines global behaviors around template
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type TemplateConfig struct {
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ExitOnRetryFailure bool `hcl:"exit_on_retry_failure"`
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StaticSecretRenderIntRaw interface{} `hcl:"static_secret_render_interval"`
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StaticSecretRenderInt time.Duration `hcl:"-"`
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}
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func NewConfig() *Config {
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return &Config{
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SharedConfig: new(configutil.SharedConfig),
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}
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}
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// LoadConfig loads the configuration at the given path, regardless if
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// its a file or directory.
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func LoadConfig(path string) (*Config, error) {
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fi, err := os.Stat(path)
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if err != nil {
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return nil, err
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}
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if fi.IsDir() {
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return nil, fmt.Errorf("location is a directory, not a file")
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}
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// Read the file
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d, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, err
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}
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// Parse!
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obj, err := hcl.Parse(string(d))
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if err != nil {
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return nil, err
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}
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// Attribute
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ast.Walk(obj, func(n ast.Node) (ast.Node, bool) {
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if k, ok := n.(*ast.ObjectKey); ok {
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k.Token.Pos.Filename = path
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}
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return n, true
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})
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// Start building the result
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result := NewConfig()
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if err := hcl.DecodeObject(result, obj); err != nil {
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return nil, err
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}
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sharedConfig, err := configutil.ParseConfig(string(d))
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if err != nil {
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return nil, err
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}
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// Pruning custom headers for Agent for now
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for _, ln := range sharedConfig.Listeners {
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ln.CustomResponseHeaders = nil
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}
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result.SharedConfig = sharedConfig
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list, ok := obj.Node.(*ast.ObjectList)
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if !ok {
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return nil, fmt.Errorf("error parsing: file doesn't contain a root object")
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}
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if err := parseAutoAuth(result, list); err != nil {
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return nil, fmt.Errorf("error parsing 'auto_auth': %w", err)
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}
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if err := parseCache(result, list); err != nil {
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return nil, fmt.Errorf("error parsing 'cache':%w", err)
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}
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if err := parseTemplateConfig(result, list); err != nil {
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return nil, fmt.Errorf("error parsing 'template_config': %w", err)
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}
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if err := parseTemplates(result, list); err != nil {
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return nil, fmt.Errorf("error parsing 'template': %w", err)
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}
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if result.Cache != nil {
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if len(result.Listeners) < 1 && len(result.Templates) < 1 {
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return nil, fmt.Errorf("enabling the cache requires at least 1 template or 1 listener to be defined")
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}
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if result.Cache.UseAutoAuthToken {
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if result.AutoAuth == nil {
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return nil, fmt.Errorf("cache.use_auto_auth_token is true but auto_auth not configured")
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}
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if result.AutoAuth.Method.WrapTTL > 0 {
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return nil, fmt.Errorf("cache.use_auto_auth_token is true and auto_auth uses wrapping")
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}
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}
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}
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if result.AutoAuth != nil {
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if len(result.AutoAuth.Sinks) == 0 &&
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(result.Cache == nil || !result.Cache.UseAutoAuthToken) &&
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len(result.Templates) == 0 {
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return nil, fmt.Errorf("auto_auth requires at least one sink or at least one template or cache.use_auto_auth_token=true")
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}
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}
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err = parseVault(result, list)
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if err != nil {
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return nil, fmt.Errorf("error parsing 'vault':%w", err)
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}
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if result.Vault == nil {
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result.Vault = &Vault{}
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}
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// Set defaults
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if result.Vault.Retry == nil {
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result.Vault.Retry = &Retry{}
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}
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switch result.Vault.Retry.NumRetries {
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case 0:
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result.Vault.Retry.NumRetries = ctconfig.DefaultRetryAttempts
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case -1:
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result.Vault.Retry.NumRetries = 0
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}
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if disableIdleConnsEnv := os.Getenv(DisableIdleConnsEnv); disableIdleConnsEnv != "" {
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result.DisableIdleConns, err = parseutil.ParseCommaStringSlice(strings.ToLower(disableIdleConnsEnv))
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if err != nil {
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return nil, fmt.Errorf("error parsing environment variable %s: %v", DisableIdleConnsEnv, err)
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}
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}
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for _, subsystem := range result.DisableIdleConns {
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switch subsystem {
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case "auto-auth":
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result.DisableIdleConnsAutoAuth = true
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case "caching":
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result.DisableIdleConnsCaching = true
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case "templating":
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result.DisableIdleConnsTemplating = true
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case "":
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continue
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default:
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return nil, fmt.Errorf("unknown disable_idle_connections value: %s", subsystem)
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}
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}
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if disableKeepAlivesEnv := os.Getenv(DisableKeepAlivesEnv); disableKeepAlivesEnv != "" {
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result.DisableKeepAlives, err = parseutil.ParseCommaStringSlice(strings.ToLower(disableKeepAlivesEnv))
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if err != nil {
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return nil, fmt.Errorf("error parsing environment variable %s: %v", DisableKeepAlivesEnv, err)
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}
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}
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for _, subsystem := range result.DisableKeepAlives {
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switch subsystem {
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case "auto-auth":
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result.DisableKeepAlivesAutoAuth = true
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case "caching":
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result.DisableKeepAlivesCaching = true
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case "templating":
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result.DisableKeepAlivesTemplating = true
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case "":
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continue
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default:
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return nil, fmt.Errorf("unknown disable_keep_alives value: %s", subsystem)
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}
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}
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return result, nil
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}
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func parseVault(result *Config, list *ast.ObjectList) error {
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name := "vault"
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vaultList := list.Filter(name)
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if len(vaultList.Items) == 0 {
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return nil
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}
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if len(vaultList.Items) > 1 {
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return fmt.Errorf("one and only one %q block is required", name)
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}
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item := vaultList.Items[0]
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var v Vault
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err := hcl.DecodeObject(&v, item.Val)
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if err != nil {
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return err
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}
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if v.TLSSkipVerifyRaw != nil {
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v.TLSSkipVerify, err = parseutil.ParseBool(v.TLSSkipVerifyRaw)
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if err != nil {
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return err
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}
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}
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result.Vault = &v
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subs, ok := item.Val.(*ast.ObjectType)
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if !ok {
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return fmt.Errorf("could not parse %q as an object", name)
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}
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if err := parseRetry(result, subs.List); err != nil {
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return fmt.Errorf("error parsing 'retry': %w", err)
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}
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return nil
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}
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func parseRetry(result *Config, list *ast.ObjectList) error {
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name := "retry"
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retryList := list.Filter(name)
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if len(retryList.Items) == 0 {
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return nil
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}
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if len(retryList.Items) > 1 {
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return fmt.Errorf("one and only one %q block is required", name)
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}
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item := retryList.Items[0]
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var r Retry
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err := hcl.DecodeObject(&r, item.Val)
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if err != nil {
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return err
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}
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result.Vault.Retry = &r
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return nil
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}
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func parseCache(result *Config, list *ast.ObjectList) error {
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name := "cache"
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cacheList := list.Filter(name)
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if len(cacheList.Items) == 0 {
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return nil
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}
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if len(cacheList.Items) > 1 {
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return fmt.Errorf("one and only one %q block is required", name)
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}
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item := cacheList.Items[0]
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var c Cache
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err := hcl.DecodeObject(&c, item.Val)
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if err != nil {
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return err
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}
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if c.UseAutoAuthTokenRaw != nil {
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c.UseAutoAuthToken, err = parseutil.ParseBool(c.UseAutoAuthTokenRaw)
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if err != nil {
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// Could be a value of "force" instead of "true"/"false"
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switch c.UseAutoAuthTokenRaw.(type) {
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case string:
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v := c.UseAutoAuthTokenRaw.(string)
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if !strings.EqualFold(v, "force") {
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return fmt.Errorf("value of 'use_auto_auth_token' can be either true/false/force, %q is an invalid option", c.UseAutoAuthTokenRaw)
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}
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c.UseAutoAuthToken = true
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c.ForceAutoAuthToken = true
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default:
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return err
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}
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}
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}
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result.Cache = &c
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subs, ok := item.Val.(*ast.ObjectType)
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if !ok {
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return fmt.Errorf("could not parse %q as an object", name)
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}
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subList := subs.List
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if err := parsePersist(result, subList); err != nil {
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return fmt.Errorf("error parsing persist: %w", err)
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}
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return nil
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}
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func parsePersist(result *Config, list *ast.ObjectList) error {
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name := "persist"
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persistList := list.Filter(name)
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if len(persistList.Items) == 0 {
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return nil
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}
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if len(persistList.Items) > 1 {
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return fmt.Errorf("only one %q block is required", name)
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}
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item := persistList.Items[0]
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var p Persist
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err := hcl.DecodeObject(&p, item.Val)
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if err != nil {
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return err
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}
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if p.Type == "" {
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if len(item.Keys) == 1 {
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p.Type = strings.ToLower(item.Keys[0].Token.Value().(string))
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}
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if p.Type == "" {
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return errors.New("persist type must be specified")
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}
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}
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result.Cache.Persist = &p
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return nil
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}
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func parseAutoAuth(result *Config, list *ast.ObjectList) error {
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name := "auto_auth"
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autoAuthList := list.Filter(name)
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if len(autoAuthList.Items) == 0 {
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return nil
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}
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if len(autoAuthList.Items) > 1 {
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return fmt.Errorf("at most one %q block is allowed", name)
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}
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// Get our item
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item := autoAuthList.Items[0]
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var a AutoAuth
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if err := hcl.DecodeObject(&a, item.Val); err != nil {
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return err
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}
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result.AutoAuth = &a
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subs, ok := item.Val.(*ast.ObjectType)
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if !ok {
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return fmt.Errorf("could not parse %q as an object", name)
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}
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subList := subs.List
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if err := parseMethod(result, subList); err != nil {
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return fmt.Errorf("error parsing 'method': %w", err)
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}
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if a.Method == nil {
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return fmt.Errorf("no 'method' block found")
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}
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if err := parseSinks(result, subList); err != nil {
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return fmt.Errorf("error parsing 'sink' stanzas: %w", err)
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}
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if result.AutoAuth.Method.WrapTTL > 0 {
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if len(result.AutoAuth.Sinks) != 1 {
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return fmt.Errorf("error parsing auto_auth: wrapping enabled on auth method and 0 or many sinks defined")
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}
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if result.AutoAuth.Sinks[0].WrapTTL > 0 {
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return fmt.Errorf("error parsing auto_auth: wrapping enabled both on auth method and sink")
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}
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}
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if result.AutoAuth.Method.MaxBackoffRaw != nil {
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var err error
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if result.AutoAuth.Method.MaxBackoff, err = parseutil.ParseDurationSecond(result.AutoAuth.Method.MaxBackoffRaw); err != nil {
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return err
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}
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result.AutoAuth.Method.MaxBackoffRaw = nil
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}
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if result.AutoAuth.Method.MinBackoffRaw != nil {
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var err error
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if result.AutoAuth.Method.MinBackoff, err = parseutil.ParseDurationSecond(result.AutoAuth.Method.MinBackoffRaw); err != nil {
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return err
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}
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result.AutoAuth.Method.MinBackoffRaw = nil
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}
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return nil
|
|
}
|
|
|
|
func parseMethod(result *Config, list *ast.ObjectList) error {
|
|
name := "method"
|
|
|
|
methodList := list.Filter(name)
|
|
if len(methodList.Items) != 1 {
|
|
return fmt.Errorf("one and only one %q block is required", name)
|
|
}
|
|
|
|
// Get our item
|
|
item := methodList.Items[0]
|
|
|
|
var m Method
|
|
if err := hcl.DecodeObject(&m, item.Val); err != nil {
|
|
return err
|
|
}
|
|
|
|
if m.Type == "" {
|
|
if len(item.Keys) == 1 {
|
|
m.Type = strings.ToLower(item.Keys[0].Token.Value().(string))
|
|
}
|
|
if m.Type == "" {
|
|
return errors.New("method type must be specified")
|
|
}
|
|
}
|
|
|
|
// Default to Vault's default
|
|
if m.MountPath == "" {
|
|
m.MountPath = fmt.Sprintf("auth/%s", m.Type)
|
|
}
|
|
// Standardize on no trailing slash
|
|
m.MountPath = strings.TrimSuffix(m.MountPath, "/")
|
|
|
|
if m.WrapTTLRaw != nil {
|
|
var err error
|
|
if m.WrapTTL, err = parseutil.ParseDurationSecond(m.WrapTTLRaw); err != nil {
|
|
return err
|
|
}
|
|
m.WrapTTLRaw = nil
|
|
}
|
|
|
|
// Canonicalize namespace path if provided
|
|
m.Namespace = namespace.Canonicalize(m.Namespace)
|
|
|
|
result.AutoAuth.Method = &m
|
|
return nil
|
|
}
|
|
|
|
func parseSinks(result *Config, list *ast.ObjectList) error {
|
|
name := "sink"
|
|
|
|
sinkList := list.Filter(name)
|
|
if len(sinkList.Items) < 1 {
|
|
return nil
|
|
}
|
|
|
|
var ts []*Sink
|
|
|
|
for _, item := range sinkList.Items {
|
|
var s Sink
|
|
if err := hcl.DecodeObject(&s, item.Val); err != nil {
|
|
return err
|
|
}
|
|
|
|
if s.Type == "" {
|
|
if len(item.Keys) == 1 {
|
|
s.Type = strings.ToLower(item.Keys[0].Token.Value().(string))
|
|
}
|
|
if s.Type == "" {
|
|
return errors.New("sink type must be specified")
|
|
}
|
|
}
|
|
|
|
if s.WrapTTLRaw != nil {
|
|
var err error
|
|
if s.WrapTTL, err = parseutil.ParseDurationSecond(s.WrapTTLRaw); err != nil {
|
|
return multierror.Prefix(err, fmt.Sprintf("sink.%s", s.Type))
|
|
}
|
|
s.WrapTTLRaw = nil
|
|
}
|
|
|
|
switch s.DHType {
|
|
case "":
|
|
case "curve25519":
|
|
default:
|
|
return multierror.Prefix(errors.New("invalid value for 'dh_type'"), fmt.Sprintf("sink.%s", s.Type))
|
|
}
|
|
|
|
if s.AADEnvVar != "" {
|
|
s.AAD = os.Getenv(s.AADEnvVar)
|
|
s.AADEnvVar = ""
|
|
}
|
|
|
|
switch {
|
|
case s.DHPath == "" && s.DHType == "":
|
|
if s.AAD != "" {
|
|
return multierror.Prefix(errors.New("specifying AAD data without 'dh_type' does not make sense"), fmt.Sprintf("sink.%s", s.Type))
|
|
}
|
|
if s.DeriveKey {
|
|
return multierror.Prefix(errors.New("specifying 'derive_key' data without 'dh_type' does not make sense"), fmt.Sprintf("sink.%s", s.Type))
|
|
}
|
|
case s.DHPath != "" && s.DHType != "":
|
|
default:
|
|
return multierror.Prefix(errors.New("'dh_type' and 'dh_path' must be specified together"), fmt.Sprintf("sink.%s", s.Type))
|
|
}
|
|
|
|
ts = append(ts, &s)
|
|
}
|
|
|
|
result.AutoAuth.Sinks = ts
|
|
return nil
|
|
}
|
|
|
|
func parseTemplateConfig(result *Config, list *ast.ObjectList) error {
|
|
name := "template_config"
|
|
|
|
templateConfigList := list.Filter(name)
|
|
if len(templateConfigList.Items) == 0 {
|
|
return nil
|
|
}
|
|
|
|
if len(templateConfigList.Items) > 1 {
|
|
return fmt.Errorf("at most one %q block is allowed", name)
|
|
}
|
|
|
|
// Get our item
|
|
item := templateConfigList.Items[0]
|
|
|
|
var cfg TemplateConfig
|
|
if err := hcl.DecodeObject(&cfg, item.Val); err != nil {
|
|
return err
|
|
}
|
|
|
|
result.TemplateConfig = &cfg
|
|
|
|
if result.TemplateConfig.StaticSecretRenderIntRaw != nil {
|
|
var err error
|
|
if result.TemplateConfig.StaticSecretRenderInt, err = parseutil.ParseDurationSecond(result.TemplateConfig.StaticSecretRenderIntRaw); err != nil {
|
|
return err
|
|
}
|
|
result.TemplateConfig.StaticSecretRenderIntRaw = nil
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func parseTemplates(result *Config, list *ast.ObjectList) error {
|
|
name := "template"
|
|
|
|
templateList := list.Filter(name)
|
|
if len(templateList.Items) < 1 {
|
|
return nil
|
|
}
|
|
|
|
var tcs []*ctconfig.TemplateConfig
|
|
|
|
for _, item := range templateList.Items {
|
|
var shadow interface{}
|
|
if err := hcl.DecodeObject(&shadow, item.Val); err != nil {
|
|
return fmt.Errorf("error decoding config: %s", err)
|
|
}
|
|
|
|
// Convert to a map and flatten the keys we want to flatten
|
|
parsed, ok := shadow.(map[string]interface{})
|
|
if !ok {
|
|
return errors.New("error converting config")
|
|
}
|
|
|
|
// flatten the wait or exec fields. The initial "wait" or "exec" value, if given, is a
|
|
// []map[string]interface{}, but we need it to be map[string]interface{}.
|
|
// Consul Template has a method flattenKeys that walks all of parsed and
|
|
// flattens every key. For Vault Agent, we only care about the wait input.
|
|
// Only one wait/exec stanza is supported, however Consul Template does not error
|
|
// with multiple instead it flattens them down, with last value winning.
|
|
// Here we take the last element of the parsed["wait"] or parsed["exec"] slice to keep
|
|
// consistency with Consul Template behavior.
|
|
wait, ok := parsed["wait"].([]map[string]interface{})
|
|
if ok {
|
|
parsed["wait"] = wait[len(wait)-1]
|
|
}
|
|
|
|
exec, ok := parsed["exec"].([]map[string]interface{})
|
|
if ok {
|
|
parsed["exec"] = exec[len(exec)-1]
|
|
}
|
|
|
|
var tc ctconfig.TemplateConfig
|
|
|
|
// Use mapstructure to populate the basic config fields
|
|
var md mapstructure.Metadata
|
|
decoder, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
|
|
DecodeHook: mapstructure.ComposeDecodeHookFunc(
|
|
ctconfig.StringToFileModeFunc(),
|
|
ctconfig.StringToWaitDurationHookFunc(),
|
|
mapstructure.StringToSliceHookFunc(","),
|
|
mapstructure.StringToTimeDurationHookFunc(),
|
|
),
|
|
ErrorUnused: true,
|
|
Metadata: &md,
|
|
Result: &tc,
|
|
})
|
|
if err != nil {
|
|
return errors.New("mapstructure decoder creation failed")
|
|
}
|
|
if err := decoder.Decode(parsed); err != nil {
|
|
return err
|
|
}
|
|
tcs = append(tcs, &tc)
|
|
}
|
|
result.Templates = tcs
|
|
return nil
|
|
}
|