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`.

models/auth/access_token_test.go

@@ -0,0 +1,132 @@
+// Copyright 2016 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package auth_test
+
+import (
+	"testing"
+
+	auth_model "code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewAccessToken(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	token := &auth_model.AccessToken{
+		UID:  3,
+		Name: "Token C",
+	}
+	assert.NoError(t, auth_model.NewAccessToken(db.DefaultContext, token))
+	unittest.AssertExistsAndLoadBean(t, token)
+
+	invalidToken := &auth_model.AccessToken{
+		ID:   token.ID, // duplicate
+		UID:  2,
+		Name: "Token F",
+	}
+	assert.Error(t, auth_model.NewAccessToken(db.DefaultContext, invalidToken))
+}
+
+func TestAccessTokenByNameExists(t *testing.T) {
+	name := "Token Gitea"
+
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	token := &auth_model.AccessToken{
+		UID:  3,
+		Name: name,
+	}
+
+	// Check to make sure it doesn't exists already
+	exist, err := auth_model.AccessTokenByNameExists(db.DefaultContext, token)
+	assert.NoError(t, err)
+	assert.False(t, exist)
+
+	// Save it to the database
+	assert.NoError(t, auth_model.NewAccessToken(db.DefaultContext, token))
+	unittest.AssertExistsAndLoadBean(t, token)
+
+	// This token must be found by name in the DB now
+	exist, err = auth_model.AccessTokenByNameExists(db.DefaultContext, token)
+	assert.NoError(t, err)
+	assert.True(t, exist)
+
+	user4Token := &auth_model.AccessToken{
+		UID:  4,
+		Name: name,
+	}
+
+	// Name matches but different user ID, this shouldn't exists in the
+	// database
+	exist, err = auth_model.AccessTokenByNameExists(db.DefaultContext, user4Token)
+	assert.NoError(t, err)
+	assert.False(t, exist)
+}
+
+func TestGetAccessTokenBySHA(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	token, err := auth_model.GetAccessTokenBySHA(db.DefaultContext, "d2c6c1ba3890b309189a8e618c72a162e4efbf36")
+	assert.NoError(t, err)
+	assert.Equal(t, int64(1), token.UID)
+	assert.Equal(t, "Token A", token.Name)
+	assert.Equal(t, "2b3668e11cb82d3af8c6e4524fc7841297668f5008d1626f0ad3417e9fa39af84c268248b78c481daa7e5dc437784003494f", token.TokenHash)
+	assert.Equal(t, "e4efbf36", token.TokenLastEight)
+
+	_, err = auth_model.GetAccessTokenBySHA(db.DefaultContext, "notahash")
+	assert.Error(t, err)
+	assert.True(t, auth_model.IsErrAccessTokenNotExist(err))
+
+	_, err = auth_model.GetAccessTokenBySHA(db.DefaultContext, "")
+	assert.Error(t, err)
+	assert.True(t, auth_model.IsErrAccessTokenEmpty(err))
+}
+
+func TestListAccessTokens(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	tokens, err := auth_model.ListAccessTokens(db.DefaultContext, auth_model.ListAccessTokensOptions{UserID: 1})
+	assert.NoError(t, err)
+	if assert.Len(t, tokens, 2) {
+		assert.Equal(t, int64(1), tokens[0].UID)
+		assert.Equal(t, int64(1), tokens[1].UID)
+		assert.Contains(t, []string{tokens[0].Name, tokens[1].Name}, "Token A")
+		assert.Contains(t, []string{tokens[0].Name, tokens[1].Name}, "Token B")
+	}
+
+	tokens, err = auth_model.ListAccessTokens(db.DefaultContext, auth_model.ListAccessTokensOptions{UserID: 2})
+	assert.NoError(t, err)
+	if assert.Len(t, tokens, 1) {
+		assert.Equal(t, int64(2), tokens[0].UID)
+		assert.Equal(t, "Token A", tokens[0].Name)
+	}
+
+	tokens, err = auth_model.ListAccessTokens(db.DefaultContext, auth_model.ListAccessTokensOptions{UserID: 100})
+	assert.NoError(t, err)
+	assert.Empty(t, tokens)
+}
+
+func TestUpdateAccessToken(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	token, err := auth_model.GetAccessTokenBySHA(db.DefaultContext, "4c6f36e6cf498e2a448662f915d932c09c5a146c")
+	assert.NoError(t, err)
+	token.Name = "Token Z"
+
+	assert.NoError(t, auth_model.UpdateAccessToken(db.DefaultContext, token))
+	unittest.AssertExistsAndLoadBean(t, token)
+}
+
+func TestDeleteAccessTokenByID(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	token, err := auth_model.GetAccessTokenBySHA(db.DefaultContext, "4c6f36e6cf498e2a448662f915d932c09c5a146c")
+	assert.NoError(t, err)
+	assert.Equal(t, int64(1), token.UID)
+
+	assert.NoError(t, auth_model.DeleteAccessTokenByID(db.DefaultContext, token.ID, 1))
+	unittest.AssertNotExistsBean(t, token)
+
+	err = auth_model.DeleteAccessTokenByID(db.DefaultContext, 100, 100)
+	assert.Error(t, err)
+	assert.True(t, auth_model.IsErrAccessTokenNotExist(err))
+}