mirror of
https://github.com/woodpecker-ci/woodpecker.git
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115 lines
2.5 KiB
Go
115 lines
2.5 KiB
Go
package secure
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"fmt"
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"io"
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"github.com/drone/drone/Godeps/_workspace/src/gopkg.in/yaml.v2"
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)
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// Parse parses and returns the secure section of the
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// yaml file as plaintext parameters.
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func Parse(key, raw string) (map[string]string, error) {
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params, err := parseSecure(raw)
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if err != nil {
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return nil, err
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}
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err = DecryptMap(key, params)
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return params, err
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}
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// Encrypt encrypts a string to base64 crypto using AES.
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func Encrypt(key, text string) (_ string, err error) {
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plaintext := []byte(text)
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block, err := aes.NewCipher(trimKey(key))
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if err != nil {
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return
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}
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ciphertext := make([]byte, aes.BlockSize+len(plaintext))
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iv := ciphertext[:aes.BlockSize]
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if _, err = io.ReadFull(rand.Reader, iv); err != nil {
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return
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}
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stream := cipher.NewCFBEncrypter(block, iv)
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stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)
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return base64.URLEncoding.EncodeToString(ciphertext), nil
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}
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// Decrypt decrtyps from base64 to decrypted string.
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func Decrypt(key, text string) (_ string, err error) {
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ciphertext, err := base64.URLEncoding.DecodeString(text)
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if err != nil {
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return
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}
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block, err := aes.NewCipher(trimKey(key))
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if err != nil {
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return
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}
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if len(ciphertext) < aes.BlockSize {
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err = fmt.Errorf("ciphertext too short")
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return
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}
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iv := ciphertext[:aes.BlockSize]
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ciphertext = ciphertext[aes.BlockSize:]
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stream := cipher.NewCFBDecrypter(block, iv)
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stream.XORKeyStream(ciphertext, ciphertext)
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return fmt.Sprintf("%s", ciphertext), nil
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}
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// DecryptMap decrypts a map of named parameters
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// from base64 to decrypted string.
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func DecryptMap(key string, params map[string]string) error {
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var err error
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for name, value := range params {
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params[name], err = Decrypt(key, value)
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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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return nil
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}
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// EncryptMap encrypts encrypts a map of string parameters
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// to base64 crypto using AES.
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func EncryptMap(key string, params map[string]string) error {
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var err error
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for name, value := range params {
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params[name], err = Encrypt(key, value)
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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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return nil
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}
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// helper function that trims a key to a maximum
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// of 32 bytes to match the expected AES block size.
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func trimKey(key string) []byte {
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b := []byte(key)
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if len(b) > 32 {
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b = b[:32]
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}
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return b
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}
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// helper function to parse the Secure data from
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// the raw yaml file.
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func parseSecure(raw string) (map[string]string, error) {
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data := struct {
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Secure map[string]string
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}{}
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err := yaml.Unmarshal([]byte(raw), &data)
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return data.Secure, err
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}
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