traefik/pkg/redactor/redactor.go

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package redactor
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import (
"encoding/json"
"fmt"
"reflect"
"github.com/mitchellh/copystructure"
"github.com/traefik/traefik/v2/pkg/config/dynamic"
"github.com/traefik/traefik/v2/pkg/tls"
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"mvdan.cc/xurls/v2"
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)
const (
maskShort = "xxxx"
maskLarge = maskShort + maskShort + maskShort + maskShort + maskShort + maskShort + maskShort + maskShort
tagLoggable = "loggable"
tagExport = "export"
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)
// Anonymize redacts the configuration fields that do not have an export=true struct tag.
// It returns the resulting marshaled configuration.
func Anonymize(baseConfig interface{}) (string, error) {
return anonymize(baseConfig, false)
}
func anonymize(baseConfig interface{}, indent bool) (string, error) {
conf, err := do(baseConfig, tagExport, true, indent)
if err != nil {
return "", err
}
return doOnJSON(conf), nil
}
// RemoveCredentials redacts the configuration fields that have a loggable=false struct tag.
// It returns the resulting marshaled configuration.
func RemoveCredentials(baseConfig interface{}) (string, error) {
return removeCredentials(baseConfig, false)
}
func removeCredentials(baseConfig interface{}, indent bool) (string, error) {
return do(baseConfig, tagLoggable, false, indent)
}
// do marshals the given configuration, while redacting some of the fields
// respectively to the given tag.
func do(baseConfig interface{}, tag string, redactByDefault, indent bool) (string, error) {
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anomConfig, err := copystructure.Copy(baseConfig)
if err != nil {
return "", err
}
val := reflect.ValueOf(anomConfig)
err = doOnStruct(val, tag, redactByDefault)
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if err != nil {
return "", err
}
configJSON, err := marshal(anomConfig, indent)
if err != nil {
return "", err
}
return string(configJSON), nil
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}
func doOnJSON(input string) string {
return xurls.Relaxed().ReplaceAllString(input, maskLarge)
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}
func doOnStruct(field reflect.Value, tag string, redactByDefault bool) error {
if field.Type().AssignableTo(reflect.TypeOf(dynamic.PluginConf{})) {
resetPlugin(field)
return nil
}
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switch field.Kind() {
case reflect.Ptr:
if !field.IsNil() {
if err := doOnStruct(field.Elem(), tag, redactByDefault); err != nil {
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return err
}
}
case reflect.Struct:
for i := 0; i < field.NumField(); i++ {
fld := field.Field(i)
stField := field.Type().Field(i)
if !isExported(stField) {
continue
}
if stField.Tag.Get(tag) == "false" || stField.Tag.Get(tag) != "true" && redactByDefault {
if err := reset(fld, stField.Name); err != nil {
return err
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}
continue
}
// A struct field cannot be set it must be filled as pointer.
if fld.Kind() == reflect.Struct {
fldPtr := reflect.New(fld.Type())
fldPtr.Elem().Set(fld)
if err := doOnStruct(fldPtr, tag, redactByDefault); err != nil {
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return err
}
fld.Set(fldPtr.Elem())
continue
}
if err := doOnStruct(fld, tag, redactByDefault); err != nil {
return err
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}
}
case reflect.Map:
for _, key := range field.MapKeys() {
val := field.MapIndex(key)
// A struct value cannot be set it must be filled as pointer.
if val.Kind() == reflect.Struct {
valPtr := reflect.New(val.Type())
valPtr.Elem().Set(val)
if err := doOnStruct(valPtr, tag, redactByDefault); err != nil {
return err
}
field.SetMapIndex(key, valPtr.Elem())
continue
}
if err := doOnStruct(val, tag, redactByDefault); err != nil {
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return err
}
}
case reflect.Slice:
for j := 0; j < field.Len(); j++ {
if err := doOnStruct(field.Index(j), tag, redactByDefault); err != nil {
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return err
}
}
}
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return nil
}
func reset(field reflect.Value, name string) error {
if !field.CanSet() {
return fmt.Errorf("cannot reset field %s", name)
}
switch field.Kind() {
case reflect.Ptr:
if !field.IsNil() {
field.Set(reflect.Zero(field.Type()))
}
case reflect.Struct:
if field.IsValid() {
field.Set(reflect.Zero(field.Type()))
}
case reflect.String:
if field.String() != "" {
if field.Type().AssignableTo(reflect.TypeOf(tls.FileOrContent(""))) {
field.Set(reflect.ValueOf(tls.FileOrContent(maskShort)))
} else {
field.Set(reflect.ValueOf(maskShort))
}
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}
case reflect.Map:
if field.Len() > 0 {
field.Set(reflect.MakeMap(field.Type()))
}
case reflect.Slice:
if field.Len() > 0 {
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switch field.Type().Elem().Kind() {
case reflect.String:
slice := reflect.MakeSlice(field.Type(), field.Len(), field.Len())
for j := 0; j < field.Len(); j++ {
slice.Index(j).SetString(maskShort)
}
field.Set(slice)
default:
field.Set(reflect.MakeSlice(field.Type(), 0, 0))
}
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}
case reflect.Interface:
return fmt.Errorf("reset not supported for interface type (for %s field)", name)
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default:
// Primitive type
field.Set(reflect.Zero(field.Type()))
}
return nil
}
// resetPlugin resets the plugin configuration so it keep the plugin name but not its configuration.
func resetPlugin(field reflect.Value) {
for _, key := range field.MapKeys() {
field.SetMapIndex(key, reflect.ValueOf(struct{}{}))
}
}
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// isExported return true is a struct field is exported, else false.
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func isExported(f reflect.StructField) bool {
if f.PkgPath != "" && !f.Anonymous {
return false
}
return true
}
func marshal(anomConfig interface{}, indent bool) ([]byte, error) {
if indent {
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return json.MarshalIndent(anomConfig, "", " ")
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}
return json.Marshal(anomConfig)
}