fix: add missing checks to several API and web handlers (#39501) (#39507)

Backport #39501 by @silverwind

Several handlers skipped checks that their sibling routes or settings
already enforce. This brings them in line.

- Push mirror API honors `DISABLE_NEW_PUSH` and checks the caller's
permission
- Media API serves small files with the usual content headers
- Issue attachment API ignores comment attachments
- Push-to-create respects `FORCE_PRIVATE`
- Profile feeds and follow actions respect `ENABLE_FEED` and owner
visibility
- Tag delete route refuses release tags
- Refresh token grant only accepts refresh tokens
- Gitea migrations bound the source's page size

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: bircni <bircni@icloud.com>

routers/web/auth/oauth2_provider.go

@@ -576,7 +576,7 @@ func handleRefreshToken(ctx *context.Context, form forms.AccessTokenForm, server
 	}
 
 	token, err := oauth2_provider.ParseToken(form.RefreshToken, serverKey)
-	if err != nil {
+	if err != nil || token.Kind != oauth2_provider.KindRefreshToken {
 		handleAccessTokenError(ctx, oauth2_provider.AccessTokenError{
 			ErrorCode:        oauth2_provider.AccessTokenErrorCodeUnauthorizedClient,
 			ErrorDescription: "unable to parse refresh token",

routers/web/feed/profile.go

@@ -9,7 +9,9 @@ import (
 	activities_model "gitea.dev/models/activities"
 	"gitea.dev/models/organization"
 	"gitea.dev/models/renderhelper"
+	user_model "gitea.dev/models/user"
 	"gitea.dev/modules/markup/markdown"
+	"gitea.dev/modules/setting"
 	"gitea.dev/services/context"
 	feed_service "gitea.dev/services/feed"
 
@@ -28,8 +30,15 @@ func ShowUserFeedAtom(ctx *context.Context) {
 
 // showUserFeed show user activity as RSS / Atom feed
 func showUserFeed(ctx *context.Context, formatType string) {
-	includePrivate := ctx.IsSigned && (ctx.Doer.IsAdmin || ctx.Doer.ID == ctx.ContextUser.ID)
 	isOrganisation := ctx.ContextUser.IsOrganization()
+	if !setting.Other.EnableFeed ||
+		isOrganisation && !organization.HasOrgOrUserVisible(ctx, ctx.ContextUser, ctx.Doer) ||
+		!isOrganisation && !user_model.IsUserVisibleToViewer(ctx, ctx.ContextUser, ctx.Doer) {
+		ctx.NotFound(nil)
+		return
+	}
+
+	includePrivate := ctx.IsSigned && (ctx.Doer.IsAdmin || ctx.Doer.ID == ctx.ContextUser.ID)
 	if ctx.IsSigned && isOrganisation && !includePrivate {
 		// When feed is requested by a member of the organization,
 		// include the private repo's the member has access to.

routers/web/repo/release.go

@@ -660,6 +660,11 @@ func deleteReleaseOrTag(ctx *context.Context, isDelTag bool) {
 		return
 	}
 
+	if isDelTag && !rel.IsTag {
+		ctx.HTTPError(http.StatusConflict, "a tag attached to a release cannot be deleted directly")
+		return
+	}
+
 	if err := release_service.DeleteReleaseByID(ctx, ctx.Repo.Repository, rel, ctx.Doer, isDelTag); err != nil {
 		if release_service.IsErrProtectedTagName(err) {
 			ctx.Flash.Error(ctx.Tr("repo.release.tag_name_protected"))

routers/web/repo/release_test.go

@@ -4,6 +4,7 @@
 package repo
 
 import (
+	"net/http"
 	"net/http/httptest"
 	"testing"
 
@@ -21,6 +22,21 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+func TestDeleteTagRetainsReleaseAndAttachments(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+	ctx, resp := contexttest.MockContext(t, "POST user2/repo1/tags/delete?id=1")
+	contexttest.LoadUser(t, ctx, 2)
+	contexttest.LoadRepo(t, ctx, 1)
+	release := unittest.AssertExistsAndLoadBean(t, &repo_model.Release{ID: 1})
+	attachment := unittest.AssertExistsAndLoadBean(t, &repo_model.Attachment{ID: 9, ReleaseID: 1})
+
+	DeleteTag(ctx)
+
+	assert.Equal(t, http.StatusConflict, resp.Code)
+	assert.Equal(t, release, unittest.AssertExistsAndLoadBean(t, &repo_model.Release{ID: 1}))
+	assert.Equal(t, attachment, unittest.AssertExistsAndLoadBean(t, &repo_model.Attachment{ID: 9}))
+}
+
 func TestNewReleasePost(t *testing.T) {
 	unittest.PrepareTestEnv(t)
 

routers/web/user/home.go

@@ -734,18 +734,10 @@ func UsernameSubRoute(ctx *context.Context) {
 			ShowGPGKeys(ctx)
 		}
 	case strings.HasSuffix(username, ".rss"):
-		if !setting.Other.EnableFeed {
-			ctx.HTTPError(http.StatusNotFound)
-			return
-		}
 		if reloadParam(".rss") {
 			feed.ShowUserFeedRSS(ctx)
 		}
 	case strings.HasSuffix(username, ".atom"):
-		if !setting.Other.EnableFeed {
-			ctx.HTTPError(http.StatusNotFound)
-			return
-		}
 		if reloadParam(".atom") {
 			feed.ShowUserFeedAtom(ctx)
 		}

routers/web/user/profile.go

@@ -322,6 +322,13 @@ func prepareUserProfileTabData(ctx *context.Context, profileDbRepo *repo_model.R
 
 // ActionUserFollow is for follow/unfollow user request
 func ActionUserFollow(ctx *context.Context) {
+	isOrg := ctx.ContextUser.IsOrganization()
+	if isOrg && !organization.HasOrgOrUserVisible(ctx, ctx.ContextUser, ctx.Doer) ||
+		!isOrg && !user_model.IsUserVisibleToViewer(ctx, ctx.ContextUser, ctx.Doer) {
+		ctx.NotFound(nil)
+		return
+	}
+
 	var err error
 	switch ctx.FormString("action") {
 	case "follow":