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61b89747ed
This PR refactors and improves the password hashing code within gitea and makes it possible for server administrators to set the password hashing parameters In addition it takes the opportunity to adjust the settings for `pbkdf2` in order to make the hashing a little stronger. The majority of this work was inspired by PR #14751 and I would like to thank @boppy for their work on this. Thanks to @gusted for the suggestion to adjust the `pbkdf2` hashing parameters. Close #14751 --------- Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: delvh <dev.lh@web.de> Co-authored-by: John Olheiser <john.olheiser@gmail.com> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
118 lines
2.7 KiB
Go
118 lines
2.7 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package pwn
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import (
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"context"
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"crypto/sha1"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"net/http"
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"strconv"
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"strings"
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"code.gitea.io/gitea/modules/setting"
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)
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const passwordURL = "https://api.pwnedpasswords.com/range/"
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// ErrEmptyPassword is an empty password error
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var ErrEmptyPassword = errors.New("password cannot be empty")
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// Client is a HaveIBeenPwned client
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type Client struct {
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ctx context.Context
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http *http.Client
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}
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// New returns a new HaveIBeenPwned Client
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func New(options ...ClientOption) *Client {
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client := &Client{
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ctx: context.Background(),
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http: http.DefaultClient,
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}
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for _, opt := range options {
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opt(client)
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}
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return client
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}
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// ClientOption is a way to modify a new Client
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type ClientOption func(*Client)
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// WithHTTP will set the http.Client of a Client
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func WithHTTP(httpClient *http.Client) func(pwnClient *Client) {
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return func(pwnClient *Client) {
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pwnClient.http = httpClient
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}
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}
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// WithContext will set the context.Context of a Client
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func WithContext(ctx context.Context) func(pwnClient *Client) {
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return func(pwnClient *Client) {
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pwnClient.ctx = ctx
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}
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}
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func newRequest(ctx context.Context, method, url string, body io.ReadCloser) (*http.Request, error) {
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req, err := http.NewRequestWithContext(ctx, method, url, body)
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if err != nil {
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return nil, err
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}
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req.Header.Add("User-Agent", "Gitea "+setting.AppVer)
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return req, nil
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}
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// CheckPassword returns the number of times a password has been compromised
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// Adding padding will make requests more secure, however is also slower
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// because artificial responses will be added to the response
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// For more information, see https://www.troyhunt.com/enhancing-pwned-passwords-privacy-with-padding/
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func (c *Client) CheckPassword(pw string, padding bool) (int, error) {
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if strings.TrimSpace(pw) == "" {
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return -1, ErrEmptyPassword
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}
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sha := sha1.New()
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sha.Write([]byte(pw))
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enc := hex.EncodeToString(sha.Sum(nil))
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prefix, suffix := enc[:5], enc[5:]
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req, err := newRequest(c.ctx, http.MethodGet, fmt.Sprintf("%s%s", passwordURL, prefix), nil)
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if err != nil {
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return -1, nil
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}
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if padding {
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req.Header.Add("Add-Padding", "true")
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}
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resp, err := c.http.Do(req)
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if err != nil {
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return -1, err
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}
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return -1, err
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}
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defer resp.Body.Close()
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for _, pair := range strings.Split(string(body), "\n") {
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parts := strings.Split(pair, ":")
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if len(parts) != 2 {
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continue
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}
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if strings.EqualFold(suffix, parts[0]) {
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count, err := strconv.ParseInt(strings.TrimSpace(parts[1]), 10, 64)
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if err != nil {
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return -1, err
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}
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return int(count), nil
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}
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}
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return 0, nil
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}
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