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mirror of https://github.com/go-gitea/gitea.git synced 2024-12-04 14:46:57 -05:00
gitea/routers/web/auth/2fa.go
KN4CK3R c6c829fe3f
Enhanced auth token / remember me (#27606)
Closes #27455

> The mechanism responsible for long-term authentication (the 'remember
me' cookie) uses a weak construction technique. It will hash the user's
hashed password and the rands value; it will then call the secure cookie
code, which will encrypt the user's name with the computed hash. If one
were able to dump the database, they could extract those two values to
rebuild that cookie and impersonate a user. That vulnerability exists
from the date the dump was obtained until a user changed their password.
> 
> To fix this security issue, the cookie could be created and verified
using a different technique such as the one explained at
https://paragonie.com/blog/2015/04/secure-authentication-php-with-long-term-persistence#secure-remember-me-cookies.

The PR removes the now obsolete setting `COOKIE_USERNAME`.
2023-10-14 00:56:41 +00:00

164 lines
4.1 KiB
Go

// Copyright 2017 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package auth
import (
"errors"
"net/http"
"code.gitea.io/gitea/models/auth"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/web"
"code.gitea.io/gitea/services/externalaccount"
"code.gitea.io/gitea/services/forms"
)
var (
tplTwofa base.TplName = "user/auth/twofa"
tplTwofaScratch base.TplName = "user/auth/twofa_scratch"
)
// TwoFactor shows the user a two-factor authentication page.
func TwoFactor(ctx *context.Context) {
ctx.Data["Title"] = ctx.Tr("twofa")
if CheckAutoLogin(ctx) {
return
}
// Ensure user is in a 2FA session.
if ctx.Session.Get("twofaUid") == nil {
ctx.ServerError("UserSignIn", errors.New("not in 2FA session"))
return
}
ctx.HTML(http.StatusOK, tplTwofa)
}
// TwoFactorPost validates a user's two-factor authentication token.
func TwoFactorPost(ctx *context.Context) {
form := web.GetForm(ctx).(*forms.TwoFactorAuthForm)
ctx.Data["Title"] = ctx.Tr("twofa")
// Ensure user is in a 2FA session.
idSess := ctx.Session.Get("twofaUid")
if idSess == nil {
ctx.ServerError("UserSignIn", errors.New("not in 2FA session"))
return
}
id := idSess.(int64)
twofa, err := auth.GetTwoFactorByUID(ctx, id)
if err != nil {
ctx.ServerError("UserSignIn", err)
return
}
// Validate the passcode with the stored TOTP secret.
ok, err := twofa.ValidateTOTP(form.Passcode)
if err != nil {
ctx.ServerError("UserSignIn", err)
return
}
if ok && twofa.LastUsedPasscode != form.Passcode {
remember := ctx.Session.Get("twofaRemember").(bool)
u, err := user_model.GetUserByID(ctx, id)
if err != nil {
ctx.ServerError("UserSignIn", err)
return
}
if ctx.Session.Get("linkAccount") != nil {
err = externalaccount.LinkAccountFromStore(ctx, ctx.Session, u)
if err != nil {
ctx.ServerError("UserSignIn", err)
return
}
}
twofa.LastUsedPasscode = form.Passcode
if err = auth.UpdateTwoFactor(ctx, twofa); err != nil {
ctx.ServerError("UserSignIn", err)
return
}
handleSignIn(ctx, u, remember)
return
}
ctx.RenderWithErr(ctx.Tr("auth.twofa_passcode_incorrect"), tplTwofa, forms.TwoFactorAuthForm{})
}
// TwoFactorScratch shows the scratch code form for two-factor authentication.
func TwoFactorScratch(ctx *context.Context) {
ctx.Data["Title"] = ctx.Tr("twofa_scratch")
if CheckAutoLogin(ctx) {
return
}
// Ensure user is in a 2FA session.
if ctx.Session.Get("twofaUid") == nil {
ctx.ServerError("UserSignIn", errors.New("not in 2FA session"))
return
}
ctx.HTML(http.StatusOK, tplTwofaScratch)
}
// TwoFactorScratchPost validates and invalidates a user's two-factor scratch token.
func TwoFactorScratchPost(ctx *context.Context) {
form := web.GetForm(ctx).(*forms.TwoFactorScratchAuthForm)
ctx.Data["Title"] = ctx.Tr("twofa_scratch")
// Ensure user is in a 2FA session.
idSess := ctx.Session.Get("twofaUid")
if idSess == nil {
ctx.ServerError("UserSignIn", errors.New("not in 2FA session"))
return
}
id := idSess.(int64)
twofa, err := auth.GetTwoFactorByUID(ctx, id)
if err != nil {
ctx.ServerError("UserSignIn", err)
return
}
// Validate the passcode with the stored TOTP secret.
if twofa.VerifyScratchToken(form.Token) {
// Invalidate the scratch token.
_, err = twofa.GenerateScratchToken()
if err != nil {
ctx.ServerError("UserSignIn", err)
return
}
if err = auth.UpdateTwoFactor(ctx, twofa); err != nil {
ctx.ServerError("UserSignIn", err)
return
}
remember := ctx.Session.Get("twofaRemember").(bool)
u, err := user_model.GetUserByID(ctx, id)
if err != nil {
ctx.ServerError("UserSignIn", err)
return
}
handleSignInFull(ctx, u, remember, false)
if ctx.Written() {
return
}
ctx.Flash.Info(ctx.Tr("auth.twofa_scratch_used"))
ctx.Redirect(setting.AppSubURL + "/user/settings/security")
return
}
ctx.RenderWithErr(ctx.Tr("auth.twofa_scratch_token_incorrect"), tplTwofaScratch, forms.TwoFactorScratchAuthForm{})
}