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mutator.go
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/
mutator.go
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/*
SPDX-FileCopyrightText: 2023 SAP SE or an SAP affiliate company and secret-generator contributors
SPDX-License-Identifier: Apache-2.0
*/
package webhook
import (
"encoding/base32"
"encoding/base64"
"fmt"
"regexp"
"strconv"
"strings"
"github.com/google/uuid"
"github.com/pkg/errors"
"github.com/sethvargo/go-password/password"
corev1 "k8s.io/api/core/v1"
)
const (
AnnotationKeyPrefix = "secret-generator.cs.sap.com/prefix"
DefaultPrefix = "%generate"
Symbols = `-~!@#$%^&*()_+={}|:<>?,./` // caveat: important to have - at first place (to work in regexp character sets)
)
func handleCreateSecret(secret *corev1.Secret) error {
prefix := DefaultPrefix
if v, ok := secret.Annotations[AnnotationKeyPrefix]; ok {
prefix = v
}
for k := range secret.Data {
if format, ok := parseValue(string(secret.Data[k]), prefix); ok {
generatedValue, err := generateValue(format)
if err != nil {
return errors.Wrapf(err, "error generating value for key '%s'", k)
}
secret.Data[k] = []byte(generatedValue)
}
}
return nil
}
func handleUpdateSecret(secret *corev1.Secret, oldSecret *corev1.Secret) error {
prefix := DefaultPrefix
if v, ok := secret.Annotations[AnnotationKeyPrefix]; ok {
prefix = v
}
for k := range secret.Data {
if format, ok := parseValue(string(secret.Data[k]), prefix); ok {
if v, ok := oldSecret.Data[k]; ok {
secret.Data[k] = v
} else {
generatedValue, err := generateValue(format)
if err != nil {
return errors.Wrapf(err, "error generating value for key '%s'", k)
}
secret.Data[k] = []byte(generatedValue)
}
}
}
return nil
}
func parseValue(value string, prefix string) (string, bool) {
if value == prefix {
return "", true
} else if strings.HasPrefix(value, prefix+":") {
return strings.TrimPrefix(value, prefix+":"), true
} else {
return "", false
}
}
func generateValue(format string) (string, error) {
if format == "" || format == ":" {
format = "password"
}
m := regexp.MustCompile(`^([^:]+)(?::(.*))?$`).FindStringSubmatch(format)
generatorType := m[1]
generatorArgs := m[2]
var generatedValue string
var generationError error
switch generatorType {
case "password":
length := 32
symbols := Symbols
numDigits := -1
numSymbols := -1
encoding := ""
if generatorArgs != "" {
for _, arg := range strings.Split(generatorArgs, ";") {
if m := regexp.MustCompile(`^length=(\d+)$`).FindStringSubmatch(arg); m != nil {
length, _ = strconv.Atoi(m[1])
} else if m := regexp.MustCompile(`^symbols=([` + Symbols + `]+)$`).FindStringSubmatch(arg); m != nil {
symbols = normalizeSymbols(m[1])
} else if m := regexp.MustCompile(`^num_digits=(\d{1,2})$`).FindStringSubmatch(arg); m != nil {
numDigits, _ = strconv.Atoi(m[1])
} else if m := regexp.MustCompile(`^num_symbols=(\d{1,2})$`).FindStringSubmatch(arg); m != nil {
numSymbols, _ = strconv.Atoi(m[1])
} else if m := regexp.MustCompile(`^encoding=(.+)$`).FindStringSubmatch(arg); m != nil {
encoding = m[1]
} else {
return "", fmt.Errorf("invalid password generator argument: %s", arg)
}
}
}
if numDigits < 0 {
numDigits = length / 4
}
if numSymbols < 0 {
numSymbols = length / 4
}
value, err := generatePassword(length, numDigits, numSymbols, symbols)
if err != nil {
return "", err
}
if encoding == "" {
generatedValue = value
} else {
generatedValue, generationError = encode(encoding, []byte(value))
}
case "uuid":
encoding := ""
if generatorArgs != "" {
for _, arg := range strings.Split(generatorArgs, ";") {
if m := regexp.MustCompile(`^encoding=(.+)$`).FindStringSubmatch(arg); m != nil {
encoding = m[1]
} else {
return "", fmt.Errorf("invalid uuid generator argument: %s", arg)
}
}
}
generatedUuid := uuid.New()
if encoding == "" {
generatedValue = generatedUuid.String()
} else {
generatedValue, generationError = encode(encoding, generatedUuid[:])
}
default:
return "", fmt.Errorf("unsupported generator type: %s", generatorType)
}
return generatedValue, generationError
}
func encode(encoding string, value []byte) (string, error) {
var encodedValue string
var err error
switch encoding {
case "base32":
encodedValue = base32.StdEncoding.EncodeToString(value)
case "base64":
encodedValue = base64.StdEncoding.EncodeToString(value)
case "base64_url":
encodedValue = base64.URLEncoding.EncodeToString(value)
case "base64_raw":
encodedValue = base64.RawStdEncoding.EncodeToString(value)
case "base64_raw_url":
encodedValue = base64.RawURLEncoding.EncodeToString(value)
default:
err = fmt.Errorf("unsupported encoding %s", encoding)
}
return encodedValue, err
}
func generatePassword(length int, numDigits int, numSymbols int, symbols string) (string, error) {
input := &password.GeneratorInput{Symbols: symbols}
generator, err := password.NewGenerator(input)
if err != nil {
return "", err
}
return generator.Generate(length, numDigits, numSymbols, false, true)
}