forgejo/modules/secret/secret.go
silverwind cda44750cb
Attachments: Add extension support, allow all types for releases (#12465)
* Attachments: Add extension support, allow all types for releases

- Add support for file extensions, matching the `accept` attribute of `<input type="file">`
- Add support for type wildcard mime types, e.g. `image/*`
- Create repository.release.ALLOWED_TYPES setting (default unrestricted)
- Change default for attachment.ALLOWED_TYPES to a list of extensions
- Split out POST /attachments into two endpoints for issue/pr and
  releases to prevent circumvention of allowed types check

Fixes: https://github.com/go-gitea/gitea/pull/10172
Fixes: https://github.com/go-gitea/gitea/issues/7266
Fixes: https://github.com/go-gitea/gitea/pull/12460
Ref: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file#Unique_file_type_specifiers

* rename function

* extract GET routes out of RepoMustNotBeArchived

Co-authored-by: Lauris BH <lauris@nix.lv>
2020-10-05 01:49:33 -04:00

102 lines
2.5 KiB
Go

// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package secret
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"errors"
"io"
)
// New creats a new secret
func New() (string, error) {
return NewWithLength(32)
}
// NewWithLength creates a new secret for a given length
func NewWithLength(length int64) (string, error) {
return randomString(length)
}
func randomBytes(len int64) ([]byte, error) {
b := make([]byte, len)
if _, err := rand.Read(b); err != nil {
return nil, err
}
return b, nil
}
func randomString(len int64) (string, error) {
b, err := randomBytes(len)
return base64.URLEncoding.EncodeToString(b), err
}
// AesEncrypt encrypts text and given key with AES.
func AesEncrypt(key, text []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
b := base64.StdEncoding.EncodeToString(text)
ciphertext := make([]byte, aes.BlockSize+len(b))
iv := ciphertext[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
return nil, err
}
cfb := cipher.NewCFBEncrypter(block, iv)
cfb.XORKeyStream(ciphertext[aes.BlockSize:], []byte(b))
return ciphertext, nil
}
// AesDecrypt decrypts text and given key with AES.
func AesDecrypt(key, text []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
if len(text) < aes.BlockSize {
return nil, errors.New("ciphertext too short")
}
iv := text[:aes.BlockSize]
text = text[aes.BlockSize:]
cfb := cipher.NewCFBDecrypter(block, iv)
cfb.XORKeyStream(text, text)
data, err := base64.StdEncoding.DecodeString(string(text))
if err != nil {
return nil, err
}
return data, nil
}
// EncryptSecret encrypts a string with given key into a hex string
func EncryptSecret(key string, str string) (string, error) {
keyHash := sha256.Sum256([]byte(key))
plaintext := []byte(str)
ciphertext, err := AesEncrypt(keyHash[:], plaintext)
if err != nil {
return "", err
}
return hex.EncodeToString(ciphertext), nil
}
// DecryptSecret decrypts a previously encrypted hex string
func DecryptSecret(key string, cipherhex string) (string, error) {
keyHash := sha256.Sum256([]byte(key))
ciphertext, err := hex.DecodeString(cipherhex)
if err != nil {
return "", err
}
plaintext, err := AesDecrypt(keyHash[:], ciphertext)
if err != nil {
return "", err
}
return string(plaintext), nil
}