From 0baefb546ab96bc3c06d90feffdb14873c2c2a3a Mon Sep 17 00:00:00 2001 From: Gusted Date: Fri, 27 Jan 2023 01:07:33 +0100 Subject: [PATCH] [PRIVACY] Add a DNS method to fetch new updates - Use TXT records in order to determine the latest available version. - This addresses a valid privacy issue, as with HTTP requests the server can keep track(estimated) of how many instances are using Forgejo, with DNS that's basically not possible as the server will never receive any data, as the only ones receiving data are DNS resolvers. --- custom/conf/app.example.ini | 1 + .../doc/advanced/config-cheat-sheet.en-us.md | 1 + modules/updatechecker/update_checker.go | 60 ++++++++++++++++--- modules/updatechecker/update_checker_test.go | 16 +++++ services/cron/tasks_extended.go | 8 ++- 5 files changed, 76 insertions(+), 10 deletions(-) create mode 100644 modules/updatechecker/update_checker_test.go diff --git a/custom/conf/app.example.ini b/custom/conf/app.example.ini index b478785a07..acab9253a5 100644 --- a/custom/conf/app.example.ini +++ b/custom/conf/app.example.ini @@ -2203,6 +2203,7 @@ ROUTER = console ;ENABLE_SUCCESS_NOTICE = false ;SCHEDULE = @every 168h ;HTTP_ENDPOINT = https://dl.gitea.io/gitea/version.json +;DOMAIN_ENDPOINT = release.forgejo.org ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; diff --git a/docs/content/doc/advanced/config-cheat-sheet.en-us.md b/docs/content/doc/advanced/config-cheat-sheet.en-us.md index 04344b15dc..754a7e6eaa 100644 --- a/docs/content/doc/advanced/config-cheat-sheet.en-us.md +++ b/docs/content/doc/advanced/config-cheat-sheet.en-us.md @@ -1031,6 +1031,7 @@ Default templates for project boards: - `ENABLE_SUCCESS_NOTICE`: **true**: Set to false to switch off success notices. - `SCHEDULE`: **@every 168h**: Cron syntax for scheduling a work, e.g. `@every 168h`. - `HTTP_ENDPOINT`: **https://dl.gitea.io/gitea/version.json**: the endpoint that Gitea will check for newer versions +- `DOMAIN_ENDPOINT`: **release.forgejo.org**: the domain that, if specified, Gitea will check for newer versions. This is preferred over `HTTP_ENDPOINT`. #### Cron - Delete all old system notices from database ('cron.delete_old_system_notices') diff --git a/modules/updatechecker/update_checker.go b/modules/updatechecker/update_checker.go index bc3f93aad7..d3008ab122 100644 --- a/modules/updatechecker/update_checker.go +++ b/modules/updatechecker/update_checker.go @@ -4,8 +4,11 @@ package updatechecker import ( + "errors" "io" + "net" "net/http" + "strings" "code.gitea.io/gitea/modules/json" "code.gitea.io/gitea/modules/proxy" @@ -26,7 +29,51 @@ func (r *CheckerState) Name() string { } // GiteaUpdateChecker returns error when new version of Gitea is available -func GiteaUpdateChecker(httpEndpoint string) error { +func GiteaUpdateChecker(httpEndpoint, domainEndpoint string) error { + var version string + var err error + if domainEndpoint != "" { + version, err = getVersionDNS(domainEndpoint) + } else { + version, err = getVersionHTTP(httpEndpoint) + } + + if err != nil { + return err + } + + return UpdateRemoteVersion(version) +} + +// getVersionDNS will request the TXT records for the domain. If a record starts +// with "forgejo_versions=" everything after that will be used as the latest +// version available. +func getVersionDNS(domainEndpoint string) (version string, err error) { + records, err := net.LookupTXT(domainEndpoint) + if err != nil { + return "", err + } + + if len(records) == 0 { + return "", errors.New("no TXT records were found") + } + + for _, record := range records { + if strings.HasPrefix(record, "forgejo_versions=") { + // Get all supported versions, separated by a comma. + supportedVersions := strings.Split(strings.TrimPrefix(record, "forgejo_versions="), ",") + // For now always return the latest supported version. + return supportedVersions[len(supportedVersions)-1], nil + } + } + + return "", errors.New("there is no TXT record with a valid value") +} + +// getVersionHTTP will make an HTTP request to the endpoint, and the returned +// content is JSON. The "latest.version" path's value will be used as the latest +// version available. +func getVersionHTTP(httpEndpoint string) (version string, err error) { httpClient := &http.Client{ Transport: &http.Transport{ Proxy: proxy.Proxy(), @@ -35,16 +82,16 @@ func GiteaUpdateChecker(httpEndpoint string) error { req, err := http.NewRequest("GET", httpEndpoint, nil) if err != nil { - return err + return "", err } resp, err := httpClient.Do(req) if err != nil { - return err + return "", err } defer resp.Body.Close() body, err := io.ReadAll(resp.Body) if err != nil { - return err + return "", err } type respType struct { @@ -55,10 +102,9 @@ func GiteaUpdateChecker(httpEndpoint string) error { respData := respType{} err = json.Unmarshal(body, &respData) if err != nil { - return err + return "", err } - - return UpdateRemoteVersion(respData.Latest.Version) + return respData.Latest.Version, nil } // UpdateRemoteVersion updates the latest available version of Gitea diff --git a/modules/updatechecker/update_checker_test.go b/modules/updatechecker/update_checker_test.go new file mode 100644 index 0000000000..301afd95e4 --- /dev/null +++ b/modules/updatechecker/update_checker_test.go @@ -0,0 +1,16 @@ +// Copyright 2023 The Forgejo Authors. All rights reserved. +// SPDX-License-Identifier: MIT + +package updatechecker + +import ( + "testing" + + "github.com/stretchr/testify/assert" +) + +func TestDNSUpdate(t *testing.T) { + version, err := getVersionDNS("release.forgejo.org") + assert.NoError(t, err) + assert.NotEmpty(t, version) +} diff --git a/services/cron/tasks_extended.go b/services/cron/tasks_extended.go index af419144a9..39568ff7ed 100644 --- a/services/cron/tasks_extended.go +++ b/services/cron/tasks_extended.go @@ -142,7 +142,8 @@ func registerDeleteOldActions() { func registerUpdateGiteaChecker() { type UpdateCheckerConfig struct { BaseConfig - HTTPEndpoint string + HTTPEndpoint string + DomainEndpoint string } RegisterTaskFatal("update_checker", &UpdateCheckerConfig{ BaseConfig: BaseConfig{ @@ -150,10 +151,11 @@ func registerUpdateGiteaChecker() { RunAtStart: false, Schedule: "@every 168h", }, - HTTPEndpoint: "https://dl.gitea.io/gitea/version.json", + HTTPEndpoint: "https://dl.gitea.io/gitea/version.json", + DomainEndpoint: "release.forgejo.org", }, func(ctx context.Context, _ *user_model.User, config Config) error { updateCheckerConfig := config.(*UpdateCheckerConfig) - return updatechecker.GiteaUpdateChecker(updateCheckerConfig.HTTPEndpoint) + return updatechecker.GiteaUpdateChecker(updateCheckerConfig.HTTPEndpoint, updateCheckerConfig.DomainEndpoint) }) }