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Unify two factor check (#27915)

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Fixes #27819

We have support for two factor logins with the normal web login and with
basic auth. For basic auth the two factor check was implemented at three
different places and you need to know that this check is necessary. This
PR moves the check into the basic auth itself.
This commit is contained in:
KN4CK3R 2023-11-06 09:22:39 +01:00 committed by GitHub
parent 8557a9455b
commit 4f4fea734c
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 77 additions and 65 deletions
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27
modules/context/api.go
View file

@ -11,7 +11,6 @@ import (
"net/url"
"strings"
"code.gitea.io/gitea/models/auth"
repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/models/unit"
user_model "code.gitea.io/gitea/models/user"
@ -211,32 +210,6 @@ func (ctx *APIContext) SetLinkHeader(total, pageSize int) {
}
}
// CheckForOTP validates OTP
func (ctx *APIContext) CheckForOTP() {
if skip, ok := ctx.Data["SkipLocalTwoFA"]; ok && skip.(bool) {
return // Skip 2FA
}
otpHeader := ctx.Req.Header.Get("X-Gitea-OTP")
twofa, err := auth.GetTwoFactorByUID(ctx, ctx.Doer.ID)
if err != nil {
if auth.IsErrTwoFactorNotEnrolled(err) {
return // No 2FA enrollment for this user
}
ctx.Error(http.StatusInternalServerError, "GetTwoFactorByUID", err)
return
}
ok, err := twofa.ValidateTOTP(otpHeader)
if err != nil {
ctx.Error(http.StatusInternalServerError, "ValidateTOTP", err)
return
}
if !ok {
ctx.Error(http.StatusUnauthorized, "", nil)
return
}
}
// APIContexter returns apicontext as middleware
func APIContexter() func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {

36
routers/api/v1/api.go
View file

@ -316,10 +316,6 @@ func reqToken() func(ctx *context.APIContext) {
return
}
if ctx.IsBasicAuth {
ctx.CheckForOTP()
return
}
if ctx.IsSigned {
return
}
@ -344,7 +340,6 @@ func reqBasicOrRevProxyAuth() func(ctx *context.APIContext) {
ctx.Error(http.StatusUnauthorized, "reqBasicAuth", "auth required")
return
}
ctx.CheckForOTP()
}
}
@ -701,12 +696,6 @@ func bind[T any](_ T) any {
}
}
// The OAuth2 plugin is expected to be executed first, as it must ignore the user id stored
// in the session (if there is a user id stored in session other plugins might return the user
// object for that id).
//
// The Session plugin is expected to be executed second, in order to skip authentication
// for users that have already signed in.
func buildAuthGroup() *auth.Group {
group := auth.NewGroup(
&auth.OAuth2{},
@ -786,31 +775,6 @@ func verifyAuthWithOptions(options *common.VerifyOptions) func(ctx *context.APIC
})
return
}
if ctx.IsSigned && ctx.IsBasicAuth {
if skip, ok := ctx.Data["SkipLocalTwoFA"]; ok && skip.(bool) {
return // Skip 2FA
}
twofa, err := auth_model.GetTwoFactorByUID(ctx, ctx.Doer.ID)
if err != nil {
if auth_model.IsErrTwoFactorNotEnrolled(err) {
return // No 2FA enrollment for this user
}
ctx.InternalServerError(err)
return
}
otpHeader := ctx.Req.Header.Get("X-Gitea-OTP")
ok, err := twofa.ValidateTOTP(otpHeader)
if err != nil {
ctx.InternalServerError(err)
return
}
if !ok {
ctx.JSON(http.StatusForbidden, map[string]string{
"message": "Only signed in user is allowed to call APIs.",
})
return
}
}
}
if options.AdminRequired {

24
services/auth/basic.go
View file

@ -15,6 +15,7 @@ import (
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/modules/web/middleware"
)
@ -131,11 +132,30 @@ func (b *Basic) Verify(req *http.Request, w http.ResponseWriter, store DataStore
return nil, err
}
if skipper, ok := source.Cfg.(LocalTwoFASkipper); ok && skipper.IsSkipLocalTwoFA() {
store.GetData()["SkipLocalTwoFA"] = true
if skipper, ok := source.Cfg.(LocalTwoFASkipper); !ok || !skipper.IsSkipLocalTwoFA() {
if err := validateTOTP(req, u); err != nil {
return nil, err
}
}
log.Trace("Basic Authorization: Logged in user %-v", u)
return u, nil
}
func validateTOTP(req *http.Request, u *user_model.User) error {
twofa, err := auth_model.GetTwoFactorByUID(req.Context(), u.ID)
if err != nil {
if auth_model.IsErrTwoFactorNotEnrolled(err) {
// No 2FA enrollment for this user
return nil
}
return err
}
if ok, err := twofa.ValidateTOTP(req.Header.Get("X-Gitea-OTP")); err != nil {
return err
} else if !ok {
return util.NewInvalidArgumentErrorf("invalid provided OTP")
}
return nil
}

55
tests/integration/api_twofa_test.go Normal file
View file

@ -0,0 +1,55 @@
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package integration
import (
"net/http"
"testing"
"time"
auth_model "code.gitea.io/gitea/models/auth"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/models/unittest"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/tests"
"github.com/pquerna/otp/totp"
"github.com/stretchr/testify/assert"
)
func TestAPITwoFactor(t *testing.T) {
defer tests.PrepareTestEnv(t)()
user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 16})
req := NewRequestf(t, "GET", "/api/v1/user")
req = AddBasicAuthHeader(req, user.Name)
MakeRequest(t, req, http.StatusOK)
otpKey, err := totp.Generate(totp.GenerateOpts{
SecretSize: 40,
Issuer: "gitea-test",
AccountName: user.Name,
})
assert.NoError(t, err)
tfa := &auth_model.TwoFactor{
UID: user.ID,
}
assert.NoError(t, tfa.SetSecret(otpKey.Secret()))
assert.NoError(t, auth_model.NewTwoFactor(db.DefaultContext, tfa))
req = NewRequestf(t, "GET", "/api/v1/user")
req = AddBasicAuthHeader(req, user.Name)
MakeRequest(t, req, http.StatusUnauthorized)
passcode, err := totp.GenerateCode(otpKey.Secret(), time.Now())
assert.NoError(t, err)
req = NewRequestf(t, "GET", "/api/v1/user")
req = AddBasicAuthHeader(req, user.Name)
req.Header.Set("X-Gitea-OTP", passcode)
MakeRequest(t, req, http.StatusOK)
}