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// 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/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/services/context"
"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")
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
}
dbCred, err := auth.GetWebAuthnCredentialByCredID(ctx, user.ID, parsedResponse.RawID)
if err != nil {
ctx.ServerError("GetWebAuthnCredentialByCredID", err)
return
}
// If the credential is legacy, assume the values are correct. The
// specification mandates these flags don't change.
if dbCred.Legacy {
dbCred.BackupEligible = parsedResponse.Response.AuthenticatorData.Flags.HasBackupEligible()
dbCred.BackupState = parsedResponse.Response.AuthenticatorData.Flags.HasBackupState()
dbCred.Legacy = false
if err := dbCred.UpdateFromLegacy(ctx); err != nil {
ctx.ServerError("UpdateFromLegacy", err)
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
}
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)
}
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