Files
forge/modules/auth/password/pwn/pwn.go
zeekayandHanzo Dev aa87442fdd Record upstream authorship centrally in NOTICE instead of in every file header
Source files keep their SPDX-License-Identifier and Hanzo copyright line; the
Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in
NOTICE, alongside LICENSE. The header lint accepts any copyright line above the
SPDX line, so it no longer demands an upstream one.

Co-authored-by: Hanzo Dev <[email protected]>
2026-09-10 17:50:35 -07:00

119 lines
2.7 KiB
Go

// Copyright 2026 Hanzo AI, Inc. All rights reserved.
// SPDX-License-Identifier: MIT
package pwn
import (
"context"
"crypto/sha1"
"encoding/hex"
"errors"
"fmt"
"io"
"net/http"
"strconv"
"strings"
"github.com/hanzoai/git/modules/setting"
)
const passwordURL = "https://api.pwnedpasswords.com/range/"
// ErrEmptyPassword is an empty password error
var ErrEmptyPassword = errors.New("password cannot be empty")
// Client is a HaveIBeenPwned client
type Client struct {
ctx context.Context
http *http.Client
}
// New returns a new HaveIBeenPwned Client
func New(options ...ClientOption) *Client {
client := &Client{
ctx: context.Background(),
http: http.DefaultClient,
}
for _, opt := range options {
opt(client)
}
return client
}
// ClientOption is a way to modify a new Client
type ClientOption func(*Client)
// WithHTTP will set the http.Client of a Client
func WithHTTP(httpClient *http.Client) func(pwnClient *Client) {
return func(pwnClient *Client) {
pwnClient.http = httpClient
}
}
// WithContext will set the context.Context of a Client
func WithContext(ctx context.Context) func(pwnClient *Client) {
return func(pwnClient *Client) {
pwnClient.ctx = ctx
}
}
func newRequest(ctx context.Context, method, url string, body io.ReadCloser) (*http.Request, error) {
req, err := http.NewRequestWithContext(ctx, method, url, body)
if err != nil {
return nil, err
}
req.Header.Add("User-Agent", "Hanzo Git "+setting.AppVer)
return req, nil
}
// CheckPassword returns the number of times a password has been compromised
// Adding padding will make requests more secure, however is also slower
// because artificial responses will be added to the response
// For more information, see https://www.troyhunt.com/enhancing-pwned-passwords-privacy-with-padding/
func (c *Client) CheckPassword(pw string, padding bool) (int64, error) {
if pw == "" {
return -1, ErrEmptyPassword
}
sha := sha1.New()
sha.Write([]byte(pw))
enc := hex.EncodeToString(sha.Sum(nil))
prefix, suffix := enc[:5], enc[5:]
req, err := newRequest(c.ctx, http.MethodGet, fmt.Sprintf("%s%s", passwordURL, prefix), nil)
if err != nil {
return -1, nil
}
if padding {
req.Header.Add("Add-Padding", "true")
}
resp, err := c.http.Do(req)
if err != nil {
return -1, err
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return -1, err
}
defer resp.Body.Close()
for pair := range strings.SplitSeq(string(body), "\n") {
parts := strings.Split(pair, ":")
if len(parts) != 2 {
continue
}
if strings.EqualFold(suffix, parts[0]) {
count, err := strconv.ParseInt(strings.TrimSpace(parts[1]), 10, 64)
if err != nil {
return -1, err
}
return count, nil
}
}
return 0, nil
}