119 lines
2.7 KiB
Go
119 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 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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