22 files changed, 309 insertions, 8 deletions

diff --git a/cmd/admin.go b/cmd/admin.go
index a049f7f2cf..9f81f5284d 100644
--- a/cmd/admin.go
+++ b/cmd/admin.go
@@ -6,6 +6,7 @@
 package cmd
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"os"
@@ -265,6 +266,13 @@ func runChangePassword(c *cli.Context) error {
 	if !pwd.IsComplexEnough(c.String("password")) {
 		return errors.New("Password does not meet complexity requirements")
 	}
+	pwned, err := pwd.IsPwned(context.Background(), c.String("password"))
+	if err != nil {
+		return err
+	}
+	if pwned {
+		return errors.New("The password you chose is on a list of stolen passwords previously exposed in public data breaches. Please try again with a different password.\nFor more details, see https://haveibeenpwned.com/Passwords")
+	}
 	uname := c.String("username")
 	user, err := models.GetUserByName(uname)
 	if err != nil {
diff --git a/custom/conf/app.example.ini b/custom/conf/app.example.ini
index bb65c4f08d..af3418f70c 100644
--- a/custom/conf/app.example.ini
+++ b/custom/conf/app.example.ini
@@ -433,7 +433,7 @@ REPO_INDEXER_TYPE = bleve
 ; Index file used for code search.
 REPO_INDEXER_PATH = indexers/repos.bleve
 ; Code indexer connection string, available when `REPO_INDEXER_TYPE` is elasticsearch. i.e. http://elastic:changeme@localhost:9200
-REPO_INDEXER_CONN_STR = 
+REPO_INDEXER_CONN_STR =
 ; Code indexer name, available when `REPO_INDEXER_TYPE` is elasticsearch
 REPO_INDEXER_NAME = gitea_codes
 
@@ -512,6 +512,8 @@ PASSWORD_COMPLEXITY = off
 PASSWORD_HASH_ALGO = argon2
 ; Set false to allow JavaScript to read CSRF cookie
 CSRF_COOKIE_HTTP_ONLY = true
+; Validate against https://haveibeenpwned.com/Passwords to see if a password has been exposed
+PASSWORD_CHECK_PWN = false
 
 [openid]
 ;
diff --git a/docs/content/doc/advanced/config-cheat-sheet.en-us.md b/docs/content/doc/advanced/config-cheat-sheet.en-us.md
index 86f60e0827..7f969add2c 100644
--- a/docs/content/doc/advanced/config-cheat-sheet.en-us.md
+++ b/docs/content/doc/advanced/config-cheat-sheet.en-us.md
@@ -344,6 +344,7 @@ set name for unique queues. Individual queues will default to
     - digit - use one or more digits
     - spec - use one or more special characters as ``!"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~``
     - off - do not check password complexity
+- `PASSWORD_CHECK_PWN`: **false**: Check [HaveIBeenPwned](https://haveibeenpwned.com/Passwords) to see if a password has been exposed.
 
 ## OpenID (`openid`)
 
diff --git a/go.mod b/go.mod
index e19e2d2328..38fb7f8390 100644
--- a/go.mod
+++ b/go.mod
@@ -98,6 +98,7 @@ require (
 	github.com/yuin/goldmark v1.2.1
 	github.com/yuin/goldmark-highlighting v0.0.0-20200307114337-60d527fdb691
 	github.com/yuin/goldmark-meta v0.0.0-20191126180153-f0638e958b60
+	go.jolheiser.com/pwn v0.0.3
 	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
 	golang.org/x/net v0.0.0-20200904194848-62affa334b73
 	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
diff --git a/go.sum b/go.sum
index 6970a6ee43..e4a0a25621 100644
--- a/go.sum
+++ b/go.sum
@@ -918,8 +918,9 @@ github.com/ziutek/mymysql v1.5.4/go.mod h1:LMSpPZ6DbqWFxNCHW77HeMg9I646SAhApZ/wK
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.etcd.io/bbolt v1.3.5 h1:XAzx9gjCb0Rxj7EoqcClPD1d5ZBxZJk0jbuoPHenBt0=
 go.etcd.io/bbolt v1.3.5/go.mod h1:G5EMThwa9y8QZGBClrRx5EY+Yw9kAhnjy3bSjsnlVTQ=
+go.jolheiser.com/pwn v0.0.3 h1:MQowb3QvCL5r5NmHmCPxw93SdjfgJ0q6rAwYn4i1Hjg=
+go.jolheiser.com/pwn v0.0.3/go.mod h1:/j5Dl8ftNqqJ8Dlx3YTrJV1wIR2lWOTyrNU3Qe7rk6I=
 go.mongodb.org/mongo-driver v1.0.3/go.mod h1:u7ryQJ+DOzQmeO7zB6MHyr8jkEQvC8vH7qLUO4lqsUM=
-go.mongodb.org/mongo-driver v1.1.1 h1:Sq1fR+0c58RME5EoqKdjkiQAmPjmfHlZOoRI6fTUOcs=
 go.mongodb.org/mongo-driver v1.1.1/go.mod h1:u7ryQJ+DOzQmeO7zB6MHyr8jkEQvC8vH7qLUO4lqsUM=
 go.mongodb.org/mongo-driver v1.3.0/go.mod h1:MSWZXKOynuguX+JSvwP8i+58jYCXxbia8HS3gZBapIE=
 go.mongodb.org/mongo-driver v1.3.4/go.mod h1:MSWZXKOynuguX+JSvwP8i+58jYCXxbia8HS3gZBapIE=
@@ -977,7 +978,6 @@ golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCc
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
 golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
-golang.org/x/mod v0.2.0 h1:KU7oHjnv3XNWfa5COkzUifxZmxp1TyI7ImMXqFxLwvQ=
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0 h1:RM4zey1++hCTbCVQfnWeKs9/IEsaBLA8vTkd0WVtmH4=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
@@ -1012,7 +1012,6 @@ golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/net v0.0.0-20200602114024-627f9648deb9/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
-golang.org/x/net v0.0.0-20200707034311-ab3426394381 h1:VXak5I6aEWmAXeQjA+QSZzlgNrpq9mjcfDemuexIKsU=
 golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20200904194848-62affa334b73 h1:MXfv8rhZWmFeqX3GNZRsd6vOLoaCHjYEX3qkRo3YBUA=
 golang.org/x/net v0.0.0-20200904194848-62affa334b73/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
diff --git a/modules/password/password.go b/modules/password/password.go
index 1c4b9c514a..e1f1f769ec 100644
--- a/modules/password/password.go
+++ b/modules/password/password.go
@@ -6,6 +6,7 @@ package password
 
 import (
 	"bytes"
+	goContext "context"
 	"crypto/rand"
 	"math/big"
 	"strings"
@@ -88,7 +89,7 @@ func IsComplexEnough(pwd string) bool {
 	return true
 }
 
-// Generate  a random password
+// Generate a random password
 func Generate(n int) (string, error) {
 	NewComplexity()
 	buffer := make([]byte, n)
@@ -101,7 +102,11 @@ func Generate(n int) (string, error) {
 			}
 			buffer[j] = validChars[rnd.Int64()]
 		}
-		if IsComplexEnough(string(buffer)) && string(buffer[0]) != " " && string(buffer[n-1]) != " " {
+		pwned, err := IsPwned(goContext.Background(), string(buffer))
+		if err != nil {
+			return "", err
+		}
+		if IsComplexEnough(string(buffer)) && !pwned && string(buffer[0]) != " " && string(buffer[n-1]) != " " {
 			return string(buffer), nil
 		}
 	}
diff --git a/modules/password/pwn.go b/modules/password/pwn.go
new file mode 100644
index 0000000000..938524e6de
--- /dev/null
+++ b/modules/password/pwn.go
@@ -0,0 +1,30 @@
+// Copyright 2020 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 password
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/modules/setting"
+
+	"go.jolheiser.com/pwn"
+)
+
+// IsPwned checks whether a password has been pwned
+// NOTE: This func returns true if it encounters an error under the assumption that you ALWAYS want to check against
+// HIBP, so not getting a response should block a password until it can be verified.
+func IsPwned(ctx context.Context, password string) (bool, error) {
+	if !setting.PasswordCheckPwn {
+		return false, nil
+	}
+
+	client := pwn.New(pwn.WithContext(ctx))
+	count, err := client.CheckPassword(password, true)
+	if err != nil {
+		return true, err
+	}
+
+	return count > 0, nil
+}
diff --git a/modules/setting/setting.go b/modules/setting/setting.go
index c93cc92804..7d7eacba6f 100644
--- a/modules/setting/setting.go
+++ b/modules/setting/setting.go
@@ -146,6 +146,7 @@ var (
 	OnlyAllowPushIfGiteaEnvironmentSet bool
 	PasswordComplexity                 []string
 	PasswordHashAlgo                   string
+	PasswordCheckPwn                   bool
 
 	// UI settings
 	UI = struct {
@@ -744,6 +745,7 @@ func NewContext() {
 	OnlyAllowPushIfGiteaEnvironmentSet = sec.Key("ONLY_ALLOW_PUSH_IF_GITEA_ENVIRONMENT_SET").MustBool(true)
 	PasswordHashAlgo = sec.Key("PASSWORD_HASH_ALGO").MustString("argon2")
 	CSRFCookieHTTPOnly = sec.Key("CSRF_COOKIE_HTTP_ONLY").MustBool(true)
+	PasswordCheckPwn = sec.Key("PASSWORD_CHECK_PWN").MustBool(false)
 
 	InternalToken = loadInternalToken(sec)
 
diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index a7b917ae1e..ce35375052 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -300,6 +300,8 @@ authorization_failed = Authorization failed
 authorization_failed_desc = The authorization failed because we detected an invalid request. Please contact the maintainer of the app you've tried to authorize.
 disable_forgot_password_mail = Account recovery is disabled. Please contact your site administrator.
 sspi_auth_failed = SSPI authentication failed
+password_pwned = The password you chose is on a <a target="_blank" rel="noopener noreferrer" href="https://haveibeenpwned.com/Passwords">list of stolen passwords</a> previously exposed in public data breaches. Please try again with a different password.
+password_pwned_err = Could not complete request to HaveIBeenPwned
 
 [mail]
 activate_account = Please activate your account
diff --git a/routers/admin/users.go b/routers/admin/users.go
index a28db2b445..531f81b8b5 100644
--- a/routers/admin/users.go
+++ b/routers/admin/users.go
@@ -108,6 +108,17 @@ func NewUserPost(ctx *context.Context, form auth.AdminCreateUserForm) {
 			ctx.RenderWithErr(password.BuildComplexityError(ctx), tplUserNew, &form)
 			return
 		}
+		pwned, err := password.IsPwned(ctx.Req.Context(), form.Password)
+		if pwned {
+			ctx.Data["Err_Password"] = true
+			errMsg := ctx.Tr("auth.password_pwned")
+			if err != nil {
+				log.Error(err.Error())
+				errMsg = ctx.Tr("auth.password_pwned_err")
+			}
+			ctx.RenderWithErr(errMsg, tplUserNew, &form)
+			return
+		}
 		u.MustChangePassword = form.MustChangePassword
 	}
 	if err := models.CreateUser(u); err != nil {
@@ -224,6 +235,17 @@ func EditUserPost(ctx *context.Context, form auth.AdminEditUserForm) {
 			ctx.RenderWithErr(password.BuildComplexityError(ctx), tplUserEdit, &form)
 			return
 		}
+		pwned, err := password.IsPwned(ctx.Req.Context(), form.Password)
+		if pwned {
+			ctx.Data["Err_Password"] = true
+			errMsg := ctx.Tr("auth.password_pwned")
+			if err != nil {
+				log.Error(err.Error())
+				errMsg = ctx.Tr("auth.password_pwned_err")
+			}
+			ctx.RenderWithErr(errMsg, tplUserNew, &form)
+			return
+		}
 		if u.Salt, err = models.GetUserSalt(); err != nil {
 			ctx.ServerError("UpdateUser", err)
 			return
diff --git a/routers/api/v1/admin/user.go b/routers/api/v1/admin/user.go
index a8a573eaf0..dc095f3a13 100644
--- a/routers/api/v1/admin/user.go
+++ b/routers/api/v1/admin/user.go
@@ -87,6 +87,15 @@ func CreateUser(ctx *context.APIContext, form api.CreateUserOption) {
 		ctx.Error(http.StatusBadRequest, "PasswordComplexity", err)
 		return
 	}
+	pwned, err := password.IsPwned(ctx.Req.Context(), form.Password)
+	if pwned {
+		if err != nil {
+			log.Error(err.Error())
+		}
+		ctx.Data["Err_Password"] = true
+		ctx.Error(http.StatusBadRequest, "PasswordPwned", errors.New("PasswordPwned"))
+		return
+	}
 	if err := models.CreateUser(u); err != nil {
 		if models.IsErrUserAlreadyExist(err) ||
 			models.IsErrEmailAlreadyUsed(err) ||
@@ -151,7 +160,15 @@ func EditUser(ctx *context.APIContext, form api.EditUserOption) {
 			ctx.Error(http.StatusBadRequest, "PasswordComplexity", err)
 			return
 		}
-		var err error
+		pwned, err := password.IsPwned(ctx.Req.Context(), form.Password)
+		if pwned {
+			if err != nil {
+				log.Error(err.Error())
+			}
+			ctx.Data["Err_Password"] = true
+			ctx.Error(http.StatusBadRequest, "PasswordPwned", errors.New("PasswordPwned"))
+			return
+		}
 		if u.Salt, err = models.GetUserSalt(); err != nil {
 			ctx.Error(http.StatusInternalServerError, "UpdateUser", err)
 			return
diff --git a/routers/user/auth.go b/routers/user/auth.go
index 4e6ac9c87f..96a73c9dd4 100644
--- a/routers/user/auth.go
+++ b/routers/user/auth.go
@@ -1110,6 +1110,17 @@ func SignUpPost(ctx *context.Context, cpt *captcha.Captcha, form auth.RegisterFo
 		ctx.RenderWithErr(password.BuildComplexityError(ctx), tplSignUp, &form)
 		return
 	}
+	pwned, err := password.IsPwned(ctx.Req.Context(), form.Password)
+	if pwned {
+		errMsg := ctx.Tr("auth.password_pwned")
+		if err != nil {
+			log.Error(err.Error())
+			errMsg = ctx.Tr("auth.password_pwned_err")
+		}
+		ctx.Data["Err_Password"] = true
+		ctx.RenderWithErr(errMsg, tplSignUp, &form)
+		return
+	}
 
 	u := &models.User{
 		Name:     form.UserName,
@@ -1409,6 +1420,16 @@ func ResetPasswdPost(ctx *context.Context) {
 		ctx.Data["Err_Password"] = true
 		ctx.RenderWithErr(password.BuildComplexityError(ctx), tplResetPassword, nil)
 		return
+	} else if pwned, err := password.IsPwned(ctx.Req.Context(), passwd); pwned || err != nil {
+		errMsg := ctx.Tr("auth.password_pwned")
+		if err != nil {
+			log.Error(err.Error())
+			errMsg = ctx.Tr("auth.password_pwned_err")
+		}
+		ctx.Data["IsResetForm"] = true
+		ctx.Data["Err_Password"] = true
+		ctx.RenderWithErr(errMsg, tplResetPassword, nil)
+		return
 	}
 
 	// Handle two-factor
@@ -1443,7 +1464,6 @@ func ResetPasswdPost(ctx *context.Context) {
 			}
 		}
 	}
-
 	var err error
 	if u.Rands, err = models.GetUserSalt(); err != nil {
 		ctx.ServerError("UpdateUser", err)
diff --git a/routers/user/setting/account.go b/routers/user/setting/account.go
index 27f0bf1c86..99e20177bc 100644
--- a/routers/user/setting/account.go
+++ b/routers/user/setting/account.go
@@ -54,6 +54,13 @@ func AccountPost(ctx *context.Context, form auth.ChangePasswordForm) {
 		ctx.Flash.Error(ctx.Tr("form.password_not_match"))
 	} else if !password.IsComplexEnough(form.Password) {
 		ctx.Flash.Error(password.BuildComplexityError(ctx))
+	} else if pwned, err := password.IsPwned(ctx.Req.Context(), form.Password); pwned || err != nil {
+		errMsg := ctx.Tr("auth.password_pwned")
+		if err != nil {
+			log.Error(err.Error())
+			errMsg = ctx.Tr("auth.password_pwned_err")
+		}
+		ctx.Flash.Error(errMsg)
 	} else {
 		var err error
 		if ctx.User.Salt, err = models.GetUserSalt(); err != nil {
diff --git a/vendor/go.jolheiser.com/pwn/.gitignore b/vendor/go.jolheiser.com/pwn/.gitignore
new file mode 100644
index 0000000000..b73cf3849a
--- /dev/null
+++ b/vendor/go.jolheiser.com/pwn/.gitignore
@@ -0,0 +1,6 @@
+# GoLand
+.idea/
+
+# Binaries
+/pwn
+/pwn.exe
\ No newline at end of file
diff --git a/vendor/go.jolheiser.com/pwn/LICENSE b/vendor/go.jolheiser.com/pwn/LICENSE
new file mode 100644
index 0000000000..0f02641b29
--- /dev/null
+++ b/vendor/go.jolheiser.com/pwn/LICENSE
@@ -0,0 +1,7 @@
+Copyright 2020 John Olheiser
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file
diff --git a/vendor/go.jolheiser.com/pwn/Makefile b/vendor/go.jolheiser.com/pwn/Makefile
new file mode 100644
index 0000000000..7f54744011
--- /dev/null
+++ b/vendor/go.jolheiser.com/pwn/Makefile
@@ -0,0 +1,18 @@
+GO ?= go
+VERSION ?= $(shell git describe --tags --always | sed 's/-/+/' | sed 's/^v//')
+
+.PHONY: fmt
+fmt:
+	$(GO) fmt ./...
+
+.PHONY: test
+test:
+	$(GO) test -race ./...
+
+.PHONY: vet
+vet:
+	$(GO) vet ./...
+
+.PHONY: build
+build:
+	$(GO) build -ldflags '-s -w -X "main.Version=$(VERSION)"' go.jolheiser.com/pwn/cmd/pwn
\ No newline at end of file
diff --git a/vendor/go.jolheiser.com/pwn/README.md b/vendor/go.jolheiser.com/pwn/README.md
new file mode 100644
index 0000000000..9b3c37eb23
--- /dev/null
+++ b/vendor/go.jolheiser.com/pwn/README.md
@@ -0,0 +1,13 @@
+# Have I Been Pwned
+
+Go library for interacting with [HaveIBeenPwned](https://haveibeenpwned.com/).
+
+Implemented:
+
+* [ ] Breaches
+* [ ] Pastes
+* [x] Passwords
+
+## License
+
+[MIT](LICENSE)
\ No newline at end of file
diff --git a/vendor/go.jolheiser.com/pwn/error.go b/vendor/go.jolheiser.com/pwn/error.go
new file mode 100644
index 0000000000..2c73ed5cee
--- /dev/null
+++ b/vendor/go.jolheiser.com/pwn/error.go
@@ -0,0 +1,15 @@
+package pwn
+
+// ErrEmptyPassword is an empty password error
+type ErrEmptyPassword struct{}
+
+// Error fulfills the error interface
+func (e ErrEmptyPassword) Error() string {
+	return "password cannot be empty"
+}
+
+// IsErrEmptyPassword checks if an error is ErrEmptyPassword
+func IsErrEmptyPassword(err error) bool {
+	_, ok := err.(ErrEmptyPassword)
+	return ok
+}
diff --git a/vendor/go.jolheiser.com/pwn/go.mod b/vendor/go.jolheiser.com/pwn/go.mod
new file mode 100644
index 0000000000..46b73c8e5c
--- /dev/null
+++ b/vendor/go.jolheiser.com/pwn/go.mod
@@ -0,0 +1,3 @@
+module go.jolheiser.com/pwn
+
+go 1.15
diff --git a/vendor/go.jolheiser.com/pwn/password.go b/vendor/go.jolheiser.com/pwn/password.go
new file mode 100644
index 0000000000..848ac49188
--- /dev/null
+++ b/vendor/go.jolheiser.com/pwn/password.go
@@ -0,0 +1,62 @@
+package pwn
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+const passwordURL = "https://api.pwnedpasswords.com/range/"
+
+// 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) (int, error) {
+	if strings.TrimSpace(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 := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return -1, err
+	}
+	defer resp.Body.Close()
+
+	for _, pair := range strings.Split(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 int(count), nil
+		}
+	}
+	return 0, nil
+}
diff --git a/vendor/go.jolheiser.com/pwn/pwn.go b/vendor/go.jolheiser.com/pwn/pwn.go
new file mode 100644
index 0000000000..399284b487
--- /dev/null
+++ b/vendor/go.jolheiser.com/pwn/pwn.go
@@ -0,0 +1,58 @@
+package pwn
+
+import (
+	"context"
+	"io"
+	"net/http"
+)
+
+const (
+	libVersion = "0.0.3"
+	userAgent  = "go.jolheiser.com/pwn v" + libVersion
+)
+
+// 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", userAgent)
+	return req, nil
+}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 87b0687cdc..72ef7b58e0 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -760,6 +760,9 @@ github.com/yuin/goldmark-highlighting
 github.com/yuin/goldmark-meta
 # go.etcd.io/bbolt v1.3.5
 go.etcd.io/bbolt
+# go.jolheiser.com/pwn v0.0.3
+## explicit
+go.jolheiser.com/pwn
 # go.mongodb.org/mongo-driver v1.3.5
 go.mongodb.org/mongo-driver/bson
 go.mongodb.org/mongo-driver/bson/bsoncodec