From b41925cee3d67a1fe546c7a219174e4a8b2302b7 Mon Sep 17 00:00:00 2001 From: wxiaoguang Date: Mon, 25 Dec 2023 20:13:18 +0800 Subject: [PATCH] Refactor CORS handler (#28587) The CORS code has been unmaintained for long time, and the behavior is not correct. This PR tries to improve it. The key point is written as comment in code. And add more tests. Fix #28515 Fix #27642 Fix #17098 --- custom/conf/app.example.ini | 8 +- .../config-cheat-sheet.en-us.md | 4 +- .../config-cheat-sheet.zh-cn.md | 2 - modules/public/public.go | 2 +- modules/setting/cors.go | 4 +- modules/web/route.go | 24 ++---- routers/api/v1/api.go | 4 +- routers/web/githttp.go | 22 ++--- routers/web/misc/misc.go | 4 - routers/web/web.go | 50 ++++++----- tests/integration/cors_test.go | 85 +++++++++++++++++-- 11 files changed, 131 insertions(+), 78 deletions(-) diff --git a/custom/conf/app.example.ini b/custom/conf/app.example.ini index f9111d541..0fcf895b5 100644 --- a/custom/conf/app.example.ini +++ b/custom/conf/app.example.ini @@ -1158,15 +1158,9 @@ LEVEL = Info ;; enable cors headers (disabled by default) ;ENABLED = false ;; -;; scheme of allowed requests -;SCHEME = http -;; -;; list of requesting domains that are allowed +;; list of requesting origins that are allowed, eg: "https://*.example.com" ;ALLOW_DOMAIN = * ;; -;; allow subdomains of headers listed above to request -;ALLOW_SUBDOMAIN = false -;; ;; list of methods allowed to request ;METHODS = GET,HEAD,POST,PUT,PATCH,DELETE,OPTIONS ;; diff --git a/docs/content/administration/config-cheat-sheet.en-us.md b/docs/content/administration/config-cheat-sheet.en-us.md index 1ba5dd04c..cd1f31fcc 100644 --- a/docs/content/administration/config-cheat-sheet.en-us.md +++ b/docs/content/administration/config-cheat-sheet.en-us.md @@ -196,9 +196,7 @@ The following configuration set `Content-Type: application/vnd.android.package-a ## CORS (`cors`) - `ENABLED`: **false**: enable cors headers (disabled by default) -- `SCHEME`: **http**: scheme of allowed requests -- `ALLOW_DOMAIN`: **\***: list of requesting domains that are allowed -- `ALLOW_SUBDOMAIN`: **false**: allow subdomains of headers listed above to request +- `ALLOW_DOMAIN`: **\***: list of requesting origins that are allowed, eg: "https://*.example.com" - `METHODS`: **GET,HEAD,POST,PUT,PATCH,DELETE,OPTIONS**: list of methods allowed to request - `MAX_AGE`: **10m**: max time to cache response - `ALLOW_CREDENTIALS`: **false**: allow request with credentials diff --git a/docs/content/administration/config-cheat-sheet.zh-cn.md b/docs/content/administration/config-cheat-sheet.zh-cn.md index 434d69815..f85da439c 100644 --- a/docs/content/administration/config-cheat-sheet.zh-cn.md +++ b/docs/content/administration/config-cheat-sheet.zh-cn.md @@ -195,9 +195,7 @@ menu: ## 跨域 (`cors`) - `ENABLED`: **false**: 启用 CORS 头部（默认禁用） -- `SCHEME`: **http**: 允许请求的协议 - `ALLOW_DOMAIN`: **\***: 允许请求的域名列表 -- `ALLOW_SUBDOMAIN`: **false**: 允许上述列出的头部的子域名发出请求。 - `METHODS`: **GET,HEAD,POST,PUT,PATCH,DELETE,OPTIONS**: 允许发起的请求方式列表 - `MAX_AGE`: **10m**: 缓存响应的最大时间 - `ALLOW_CREDENTIALS`: **false**: 允许带有凭据的请求 diff --git a/modules/public/public.go b/modules/public/public.go index 5fbfe30a8..abc6b4615 100644 --- a/modules/public/public.go +++ b/modules/public/public.go @@ -33,7 +33,7 @@ func FileHandlerFunc() http.HandlerFunc { assetFS := AssetFS() return func(resp http.ResponseWriter, req *http.Request) { if req.Method != "GET" && req.Method != "HEAD" { - resp.WriteHeader(http.StatusNotFound) + resp.WriteHeader(http.StatusMethodNotAllowed) return } handleRequest(resp, req, assetFS, req.URL.Path) diff --git a/modules/setting/cors.go b/modules/setting/cors.go index bafbbab64..63daaad60 100644 --- a/modules/setting/cors.go +++ b/modules/setting/cors.go @@ -12,9 +12,7 @@ import ( // CORSConfig defines CORS settings var CORSConfig = struct { Enabled bool - Scheme string - AllowDomain []string - AllowSubdomain bool + AllowDomain []string // FIXME: this option is from legacy code, it actually works as "AllowedOrigins". When refactoring in the future, the config option should also be renamed together. Methods []string MaxAge time.Duration AllowCredentials bool diff --git a/modules/web/route.go b/modules/web/route.go index 86b83dd72..805fcb441 100644 --- a/modules/web/route.go +++ b/modules/web/route.go @@ -101,16 +101,18 @@ func (r *Route) wrapMiddlewareAndHandler(h []any) ([]func(http.Handler) http.Han return middlewares, handlerFunc } -func (r *Route) Methods(method, pattern string, h ...any) { +// Methods adds the same handlers for multiple http "methods" (separated by ","). +// If any method is invalid, the lower level router will panic. +func (r *Route) Methods(methods, pattern string, h ...any) { middlewares, handlerFunc := r.wrapMiddlewareAndHandler(h) fullPattern := r.getPattern(pattern) - if strings.Contains(method, ",") { - methods := strings.Split(method, ",") + if strings.Contains(methods, ",") { + methods := strings.Split(methods, ",") for _, method := range methods { r.R.With(middlewares...).Method(strings.TrimSpace(method), fullPattern, handlerFunc) } } else { - r.R.With(middlewares...).Method(method, fullPattern, handlerFunc) + r.R.With(middlewares...).Method(methods, fullPattern, handlerFunc) } } @@ -136,20 +138,6 @@ func (r *Route) Get(pattern string, h ...any) { r.Methods("GET", pattern, h...) } -func (r *Route) Options(pattern string, h ...any) { - r.Methods("OPTIONS", pattern, h...) -} - -// GetOptions delegate get and options method -func (r *Route) GetOptions(pattern string, h ...any) { - r.Methods("GET,OPTIONS", pattern, h...) -} - -// PostOptions delegate post and options method -func (r *Route) PostOptions(pattern string, h ...any) { - r.Methods("POST,OPTIONS", pattern, h...) -} - // Head delegate head method func (r *Route) Head(pattern string, h ...any) { r.Methods("HEAD", pattern, h...) diff --git a/routers/api/v1/api.go b/routers/api/v1/api.go index 0e437bb92..a4c3d6f44 100644 --- a/routers/api/v1/api.go +++ b/routers/api/v1/api.go @@ -822,9 +822,7 @@ func Routes() *web.Route { m.Use(securityHeaders()) if setting.CORSConfig.Enabled { m.Use(cors.Handler(cors.Options{ - // Scheme: setting.CORSConfig.Scheme, // FIXME: the cors middleware needs scheme option - AllowedOrigins: setting.CORSConfig.AllowDomain, - // setting.CORSConfig.AllowSubdomain // FIXME: the cors middleware needs allowSubdomain option + AllowedOrigins: setting.CORSConfig.AllowDomain, AllowedMethods: setting.CORSConfig.Methods, AllowCredentials: setting.CORSConfig.AllowCredentials, AllowedHeaders: append([]string{"Authorization", "X-Gitea-OTP"}, setting.CORSConfig.Headers...), diff --git a/routers/web/githttp.go b/routers/web/githttp.go index b2fb5b472..8d0d1ce03 100644 --- a/routers/web/githttp.go +++ b/routers/web/githttp.go @@ -28,16 +28,16 @@ func requireSignIn(ctx *context.Context) { func gitHTTPRouters(m *web.Route) { m.Group("", func() { - m.PostOptions("/git-upload-pack", repo.ServiceUploadPack) - m.PostOptions("/git-receive-pack", repo.ServiceReceivePack) - m.GetOptions("/info/refs", repo.GetInfoRefs) - m.GetOptions("/HEAD", repo.GetTextFile("HEAD")) - m.GetOptions("/objects/info/alternates", repo.GetTextFile("objects/info/alternates")) - m.GetOptions("/objects/info/http-alternates", repo.GetTextFile("objects/info/http-alternates")) - m.GetOptions("/objects/info/packs", repo.GetInfoPacks) - m.GetOptions("/objects/info/{file:[^/]*}", repo.GetTextFile("")) - m.GetOptions("/objects/{head:[0-9a-f]{2}}/{hash:[0-9a-f]{38}}", repo.GetLooseObject) - m.GetOptions("/objects/pack/pack-{file:[0-9a-f]{40}}.pack", repo.GetPackFile) - m.GetOptions("/objects/pack/pack-{file:[0-9a-f]{40}}.idx", repo.GetIdxFile) + m.Methods("POST,OPTIONS", "/git-upload-pack", repo.ServiceUploadPack) + m.Methods("POST,OPTIONS", "/git-receive-pack", repo.ServiceReceivePack) + m.Methods("GET,OPTIONS", "/info/refs", repo.GetInfoRefs) + m.Methods("GET,OPTIONS", "/HEAD", repo.GetTextFile("HEAD")) + m.Methods("GET,OPTIONS", "/objects/info/alternates", repo.GetTextFile("objects/info/alternates")) + m.Methods("GET,OPTIONS", "/objects/info/http-alternates", repo.GetTextFile("objects/info/http-alternates")) + m.Methods("GET,OPTIONS", "/objects/info/packs", repo.GetInfoPacks) + m.Methods("GET,OPTIONS", "/objects/info/{file:[^/]*}", repo.GetTextFile("")) + m.Methods("GET,OPTIONS", "/objects/{head:[0-9a-f]{2}}/{hash:[0-9a-f]{38}}", repo.GetLooseObject) + m.Methods("GET,OPTIONS", "/objects/pack/pack-{file:[0-9a-f]{40}}.pack", repo.GetPackFile) + m.Methods("GET,OPTIONS", "/objects/pack/pack-{file:[0-9a-f]{40}}.idx", repo.GetIdxFile) }, ignSignInAndCsrf, requireSignIn, repo.HTTPGitEnabledHandler, repo.CorsHandler(), context_service.UserAssignmentWeb()) } diff --git a/routers/web/misc/misc.go b/routers/web/misc/misc.go index e35199401..54c93763f 100644 --- a/routers/web/misc/misc.go +++ b/routers/web/misc/misc.go @@ -33,10 +33,6 @@ func DummyOK(w http.ResponseWriter, req *http.Request) { w.WriteHeader(http.StatusOK) } -func DummyBadRequest(w http.ResponseWriter, req *http.Request) { - w.WriteHeader(http.StatusBadRequest) -} - func RobotsTxt(w http.ResponseWriter, req *http.Request) { robotsTxt := util.FilePathJoinAbs(setting.CustomPath, "public/robots.txt") if ok, _ := util.IsExist(robotsTxt); !ok { diff --git a/routers/web/web.go b/routers/web/web.go index 02fb11b1f..164c137f2 100644 --- a/routers/web/web.go +++ b/routers/web/web.go @@ -60,13 +60,12 @@ const ( GzipMinSize = 1400 ) -// CorsHandler return a http handler who set CORS options if enabled by config -func CorsHandler() func(next http.Handler) http.Handler { +// optionsCorsHandler return a http handler which sets CORS options if enabled by config, it blocks non-CORS OPTIONS requests. +func optionsCorsHandler() func(next http.Handler) http.Handler { + var corsHandler func(next http.Handler) http.Handler if setting.CORSConfig.Enabled { - return cors.Handler(cors.Options{ - // Scheme: setting.CORSConfig.Scheme, // FIXME: the cors middleware needs scheme option - AllowedOrigins: setting.CORSConfig.AllowDomain, - // setting.CORSConfig.AllowSubdomain // FIXME: the cors middleware needs allowSubdomain option + corsHandler = cors.Handler(cors.Options{ + AllowedOrigins: setting.CORSConfig.AllowDomain, AllowedMethods: setting.CORSConfig.Methods, AllowCredentials: setting.CORSConfig.AllowCredentials, AllowedHeaders: setting.CORSConfig.Headers, @@ -75,7 +74,23 @@ func CorsHandler() func(next http.Handler) http.Handler { } return func(next http.Handler) http.Handler { - return next + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + if r.Method == http.MethodOptions { + if corsHandler != nil && r.Header.Get("Access-Control-Request-Method") != "" { + corsHandler(next).ServeHTTP(w, r) + } else { + // it should explicitly deny OPTIONS requests if CORS handler is not executed, to avoid the next GET/POST handler being incorrectly called by the OPTIONS request + w.WriteHeader(http.StatusMethodNotAllowed) + } + return + } + // for non-OPTIONS requests, call the CORS handler to add some related headers like "Vary" + if corsHandler != nil { + corsHandler(next).ServeHTTP(w, r) + } else { + next.ServeHTTP(w, r) + } + }) } } @@ -218,7 +233,7 @@ func Routes() *web.Route { routes := web.NewRoute() routes.Head("/", misc.DummyOK) // for health check - doesn't need to be passed through gzip handler - routes.Methods("GET, HEAD", "/assets/*", CorsHandler(), public.FileHandlerFunc()) + routes.Methods("GET, HEAD, OPTIONS", "/assets/*", optionsCorsHandler(), public.FileHandlerFunc()) routes.Methods("GET, HEAD", "/avatars/*", storageHandler(setting.Avatar.Storage, "avatars", storage.Avatars)) routes.Methods("GET, HEAD", "/repo-avatars/*", storageHandler(setting.RepoAvatar.Storage, "repo-avatars", storage.RepoAvatars)) routes.Methods("GET, HEAD", "/apple-touch-icon.png", misc.StaticRedirect("/assets/img/apple-touch-icon.png")) @@ -458,8 +473,8 @@ func registerRoutes(m *web.Route) { m.Get("/change-password", func(ctx *context.Context) { ctx.Redirect(setting.AppSubURL + "/user/settings/account") }) - m.Any("/*", CorsHandler(), public.FileHandlerFunc()) - }, CorsHandler()) + m.Methods("GET, HEAD", "/*", public.FileHandlerFunc()) + }, optionsCorsHandler()) m.Group("/explore", func() { m.Get("", func(ctx *context.Context) { @@ -532,14 +547,11 @@ func registerRoutes(m *web.Route) { // TODO manage redirection m.Post("/authorize", web.Bind(forms.AuthorizationForm{}), auth.AuthorizeOAuth) }, ignSignInAndCsrf, reqSignIn) - m.Options("/login/oauth/userinfo", CorsHandler(), misc.DummyBadRequest) - m.Get("/login/oauth/userinfo", ignSignInAndCsrf, auth.InfoOAuth) - m.Options("/login/oauth/access_token", CorsHandler(), misc.DummyBadRequest) - m.Post("/login/oauth/access_token", CorsHandler(), web.Bind(forms.AccessTokenForm{}), ignSignInAndCsrf, auth.AccessTokenOAuth) - m.Options("/login/oauth/keys", CorsHandler(), misc.DummyBadRequest) - m.Get("/login/oauth/keys", ignSignInAndCsrf, auth.OIDCKeys) - m.Options("/login/oauth/introspect", CorsHandler(), misc.DummyBadRequest) - m.Post("/login/oauth/introspect", CorsHandler(), web.Bind(forms.IntrospectTokenForm{}), ignSignInAndCsrf, auth.IntrospectOAuth) + + m.Methods("GET, OPTIONS", "/login/oauth/userinfo", optionsCorsHandler(), ignSignInAndCsrf, auth.InfoOAuth) + m.Methods("POST, OPTIONS", "/login/oauth/access_token", optionsCorsHandler(), web.Bind(forms.AccessTokenForm{}), ignSignInAndCsrf, auth.AccessTokenOAuth) + m.Methods("GET, OPTIONS", "/login/oauth/keys", optionsCorsHandler(), ignSignInAndCsrf, auth.OIDCKeys) + m.Methods("POST, OPTIONS", "/login/oauth/introspect", optionsCorsHandler(), web.Bind(forms.IntrospectTokenForm{}), ignSignInAndCsrf, auth.IntrospectOAuth) m.Group("/user/settings", func() { m.Get("", user_setting.Profile) @@ -770,7 +782,7 @@ func registerRoutes(m *web.Route) { m.Group("", func() { m.Get("/{username}", user.UsernameSubRoute) - m.Get("/attachments/{uuid}", repo.GetAttachment) + m.Methods("GET, OPTIONS", "/attachments/{uuid}", optionsCorsHandler(), repo.GetAttachment) }, ignSignIn) m.Post("/{username}", reqSignIn, context_service.UserAssignmentWeb(), user.Action) diff --git a/tests/integration/cors_test.go b/tests/integration/cors_test.go index 83d200402..25dfbabf4 100644 --- a/tests/integration/cors_test.go +++ b/tests/integration/cors_test.go @@ -7,17 +7,88 @@ import ( "net/http" "testing" + "code.gitea.io/gitea/modules/setting" + "code.gitea.io/gitea/modules/test" + "code.gitea.io/gitea/routers" "code.gitea.io/gitea/tests" "github.com/stretchr/testify/assert" ) -func TestCORSNotSet(t *testing.T) { +func TestCORS(t *testing.T) { defer tests.PrepareTestEnv(t)() - req := NewRequest(t, "GET", "/api/v1/version") - session := loginUser(t, "user2") - resp := session.MakeRequest(t, req, http.StatusOK) - assert.Equal(t, resp.Code, http.StatusOK) - corsHeader := resp.Header().Get("Access-Control-Allow-Origin") - assert.Empty(t, corsHeader, "Access-Control-Allow-Origin: generated header should match") // header not set + t.Run("CORS enabled", func(t *testing.T) { + defer test.MockVariableValue(&setting.CORSConfig.Enabled, true)() + defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())() + + t.Run("API with CORS", func(t *testing.T) { + // GET api with no CORS header + req := NewRequest(t, "GET", "/api/v1/version") + resp := MakeRequest(t, req, http.StatusOK) + assert.Empty(t, resp.Header().Get("Access-Control-Allow-Origin")) + assert.Contains(t, resp.Header().Values("Vary"), "Origin") + + // OPTIONS api for CORS + req = NewRequest(t, "OPTIONS", "/api/v1/version"). + SetHeader("Origin", "https://example.com"). + SetHeader("Access-Control-Request-Method", "GET") + resp = MakeRequest(t, req, http.StatusOK) + assert.NotEmpty(t, resp.Header().Get("Access-Control-Allow-Origin")) + assert.Contains(t, resp.Header().Values("Vary"), "Origin") + }) + + t.Run("Web with CORS", func(t *testing.T) { + // GET userinfo with no CORS header + req := NewRequest(t, "GET", "/login/oauth/userinfo") + resp := MakeRequest(t, req, http.StatusUnauthorized) + assert.Empty(t, resp.Header().Get("Access-Control-Allow-Origin")) + assert.Contains(t, resp.Header().Values("Vary"), "Origin") + + // OPTIONS userinfo for CORS + req = NewRequest(t, "OPTIONS", "/login/oauth/userinfo"). + SetHeader("Origin", "https://example.com"). + SetHeader("Access-Control-Request-Method", "GET") + resp = MakeRequest(t, req, http.StatusOK) + assert.NotEmpty(t, resp.Header().Get("Access-Control-Allow-Origin")) + assert.Contains(t, resp.Header().Values("Vary"), "Origin") + + // OPTIONS userinfo for non-CORS + req = NewRequest(t, "OPTIONS", "/login/oauth/userinfo") + resp = MakeRequest(t, req, http.StatusMethodNotAllowed) + assert.NotContains(t, resp.Header().Values("Vary"), "Origin") + }) + }) + + t.Run("CORS disabled", func(t *testing.T) { + defer test.MockVariableValue(&setting.CORSConfig.Enabled, false)() + defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())() + + t.Run("API without CORS", func(t *testing.T) { + req := NewRequest(t, "GET", "/api/v1/version") + resp := MakeRequest(t, req, http.StatusOK) + assert.Empty(t, resp.Header().Get("Access-Control-Allow-Origin")) + assert.Empty(t, resp.Header().Values("Vary")) + + req = NewRequest(t, "OPTIONS", "/api/v1/version"). + SetHeader("Origin", "https://example.com"). + SetHeader("Access-Control-Request-Method", "GET") + resp = MakeRequest(t, req, http.StatusMethodNotAllowed) + assert.Empty(t, resp.Header().Get("Access-Control-Allow-Origin")) + assert.Empty(t, resp.Header().Values("Vary")) + }) + + t.Run("Web without CORS", func(t *testing.T) { + req := NewRequest(t, "GET", "/login/oauth/userinfo") + resp := MakeRequest(t, req, http.StatusUnauthorized) + assert.Empty(t, resp.Header().Get("Access-Control-Allow-Origin")) + assert.NotContains(t, resp.Header().Values("Vary"), "Origin") + + req = NewRequest(t, "OPTIONS", "/login/oauth/userinfo"). + SetHeader("Origin", "https://example.com"). + SetHeader("Access-Control-Request-Method", "GET") + resp = MakeRequest(t, req, http.StatusMethodNotAllowed) + assert.Empty(t, resp.Header().Get("Access-Control-Allow-Origin")) + assert.NotContains(t, resp.Header().Values("Vary"), "Origin") + }) + }) }