forgejo/routers/web/auth/webauthn.go
Giteabot 63a321b83a
Don't show Link to TOTP if not set up (#27585) (#27588)
Backport #27585 by @JakobDev

Fixes https://codeberg.org/forgejo/forgejo/issues/1592

When login in with WebAuth, the page has a link to use TOTP instead.
This link is always displayed, no matter if the User has set up TOTP or
not, which do of cause not work for those who have not.

Co-authored-by: JakobDev <jakobdev@gmx.de>
2023-10-11 22:59:21 +02:00

166 lines
4.7 KiB
Go

// Copyright 2018 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"
wa "code.gitea.io/gitea/modules/auth/webauthn"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/services/externalaccount"
"github.com/go-webauthn/webauthn/protocol"
"github.com/go-webauthn/webauthn/webauthn"
)
var tplWebAuthn base.TplName = "user/auth/webauthn"
// WebAuthn shows the WebAuthn login page
func WebAuthn(ctx *context.Context) {
ctx.Data["Title"] = ctx.Tr("twofa")
// Check auto-login.
if checkAutoLogin(ctx) {
return
}
// Ensure user is in a 2FA session.
if ctx.Session.Get("twofaUid") == nil {
ctx.ServerError("UserSignIn", errors.New("not in WebAuthn session"))
return
}
hasTwoFactor, err := auth.HasTwoFactorByUID(ctx, ctx.Session.Get("twofaUid").(int64))
if err != nil {
ctx.ServerError("HasTwoFactorByUID", err)
return
}
ctx.Data["HasTwoFactor"] = hasTwoFactor
ctx.HTML(http.StatusOK, tplWebAuthn)
}
// WebAuthnLoginAssertion submits a WebAuthn challenge to the browser
func WebAuthnLoginAssertion(ctx *context.Context) {
// Ensure user is in a WebAuthn session.
idSess, ok := ctx.Session.Get("twofaUid").(int64)
if !ok || idSess == 0 {
ctx.ServerError("UserSignIn", errors.New("not in WebAuthn session"))
return
}
user, err := user_model.GetUserByID(ctx, idSess)
if err != nil {
ctx.ServerError("UserSignIn", err)
return
}
exists, err := auth.ExistsWebAuthnCredentialsForUID(ctx, user.ID)
if err != nil {
ctx.ServerError("UserSignIn", err)
return
}
if !exists {
ctx.ServerError("UserSignIn", errors.New("no device registered"))
return
}
assertion, sessionData, err := wa.WebAuthn.BeginLogin((*wa.User)(user))
if err != nil {
ctx.ServerError("webauthn.BeginLogin", err)
return
}
if err := ctx.Session.Set("webauthnAssertion", sessionData); err != nil {
ctx.ServerError("Session.Set", err)
return
}
ctx.JSON(http.StatusOK, assertion)
}
// WebAuthnLoginAssertionPost validates the signature and logs the user in
func WebAuthnLoginAssertionPost(ctx *context.Context) {
idSess, ok := ctx.Session.Get("twofaUid").(int64)
sessionData, okData := ctx.Session.Get("webauthnAssertion").(*webauthn.SessionData)
if !ok || !okData || sessionData == nil || idSess == 0 {
ctx.ServerError("UserSignIn", errors.New("not in WebAuthn session"))
return
}
defer func() {
_ = ctx.Session.Delete("webauthnAssertion")
}()
// Load the user from the db
user, err := user_model.GetUserByID(ctx, idSess)
if err != nil {
ctx.ServerError("UserSignIn", err)
return
}
log.Trace("Finishing webauthn authentication with user: %s", user.Name)
// Now we do the equivalent of webauthn.FinishLogin using a combination of our session data
// (from webauthnAssertion) and verify the provided request.0
parsedResponse, err := protocol.ParseCredentialRequestResponse(ctx.Req)
if err != nil {
// Failed authentication attempt.
log.Info("Failed authentication attempt for %s from %s: %v", user.Name, ctx.RemoteAddr(), err)
ctx.Status(http.StatusForbidden)
return
}
// Validate the parsed response.
cred, err := wa.WebAuthn.ValidateLogin((*wa.User)(user), *sessionData, parsedResponse)
if err != nil {
// Failed authentication attempt.
log.Info("Failed authentication attempt for %s from %s: %v", user.Name, ctx.RemoteAddr(), err)
ctx.Status(http.StatusForbidden)
return
}
// Ensure that the credential wasn't cloned by checking if CloneWarning is set.
// (This is set if the sign counter is less than the one we have stored.)
if cred.Authenticator.CloneWarning {
log.Info("Failed authentication attempt for %s from %s: cloned credential", user.Name, ctx.RemoteAddr())
ctx.Status(http.StatusForbidden)
return
}
// Success! Get the credential and update the sign count with the new value we received.
dbCred, err := auth.GetWebAuthnCredentialByCredID(ctx, user.ID, cred.ID)
if err != nil {
ctx.ServerError("GetWebAuthnCredentialByCredID", err)
return
}
dbCred.SignCount = cred.Authenticator.SignCount
if err := dbCred.UpdateSignCount(ctx); err != nil {
ctx.ServerError("UpdateSignCount", err)
return
}
// Now handle account linking if that's requested
if ctx.Session.Get("linkAccount") != nil {
if err := externalaccount.LinkAccountFromStore(ctx, ctx.Session, user); err != nil {
ctx.ServerError("LinkAccountFromStore", err)
return
}
}
remember := ctx.Session.Get("twofaRemember").(bool)
redirect := handleSignInFull(ctx, user, remember, false)
if redirect == "" {
redirect = setting.AppSubURL + "/"
}
_ = ctx.Session.Delete("twofaUid")
ctx.JSONRedirect(redirect)
}