Double check CloneURL is acceptable (go-gitea#20869)

Some Migration Downloaders provide re-writing of CloneURLs that may point to
unallowed urls. Recheck after the CloneURL is rewritten.

Signed-off-by: Andrew Thornton <art27@cantab.net>

services/migrations/dump.go

@@ -560,6 +560,10 @@ func (g *RepositoryDumper) Finish() error {
 
 // DumpRepository dump repository according MigrateOptions to a local directory
 func DumpRepository(ctx context.Context, baseDir, ownerName string, opts base.MigrateOptions) error {
+	doer, err := user_model.GetAdminUser()
+	if err != nil {
+		return err
+	}
 	downloader, err := newDownloader(ctx, ownerName, opts)
 	if err != nil {
 		return err
@@ -569,7 +573,7 @@ func DumpRepository(ctx context.Context, baseDir, ownerName string, opts base.Mi
 		return err
 	}
 
-	if err := migrateRepository(downloader, uploader, opts, nil); err != nil {
+	if err := migrateRepository(doer, downloader, uploader, opts, nil); err != nil {
 		if err1 := uploader.Rollback(); err1 != nil {
 			log.Error("rollback failed: %v", err1)
 		}
@@ -641,7 +645,7 @@ func RestoreRepository(ctx context.Context, baseDir, ownerName, repoName string,
 		return err
 	}
 
-	if err = migrateRepository(downloader, uploader, migrateOpts, nil); err != nil {
+	if err = migrateRepository(doer, downloader, uploader, migrateOpts, nil); err != nil {
 		if err1 := uploader.Rollback(); err1 != nil {
 			log.Error("rollback failed: %v", err1)
 		}

services/migrations/gitea_uploader_test.go

@@ -46,7 +46,7 @@ func TestGiteaUploadRepo(t *testing.T) {
 		uploader   = NewGiteaLocalUploader(graceful.GetManager().HammerContext(), user, user.Name, repoName)
 	)
 
-	err := migrateRepository(downloader, uploader, base.MigrateOptions{
+	err := migrateRepository(user, downloader, uploader, base.MigrateOptions{
 		CloneAddr:    "https://github.com/go-xorm/builder",
 		RepoName:     repoName,
 		AuthUsername: "",

services/migrations/migrate.go

@@ -128,7 +128,7 @@ func MigrateRepository(ctx context.Context, doer *user_model.User, ownerName str
 	uploader := NewGiteaLocalUploader(ctx, doer, ownerName, opts.RepoName)
 	uploader.gitServiceType = opts.GitServiceType
 
-	if err := migrateRepository(downloader, uploader, opts, messenger); err != nil {
+	if err := migrateRepository(doer, downloader, uploader, opts, messenger); err != nil {
 		if err1 := uploader.Rollback(); err1 != nil {
 			log.Error("rollback failed: %v", err1)
 		}
@@ -177,7 +177,7 @@ func newDownloader(ctx context.Context, ownerName string, opts base.MigrateOptio
 // migrateRepository will download information and then upload it to Uploader, this is a simple
 // process for small repository. For a big repository, save all the data to disk
 // before upload is better
-func migrateRepository(downloader base.Downloader, uploader base.Uploader, opts base.MigrateOptions, messenger base.Messenger) error {
+func migrateRepository(doer *user_model.User, downloader base.Downloader, uploader base.Uploader, opts base.MigrateOptions, messenger base.Messenger) error {
 	if messenger == nil {
 		messenger = base.NilMessenger
 	}
@@ -198,6 +198,21 @@ func migrateRepository(downloader base.Downloader, uploader base.Uploader, opts
 		return err
 	}
 
+	// If the downloader is not a RepositoryRestorer then we need to recheck the CloneURL
+	if _, ok := downloader.(*RepositoryRestorer); !ok {
+		// Now the clone URL can be rewritten by the downloader so we must recheck
+		if err := IsMigrateURLAllowed(repo.CloneURL, doer); err != nil {
+			return err
+		}
+
+		// And so can the original URL too so again we must recheck
+		if repo.OriginalURL != "" {
+			if err := IsMigrateURLAllowed(repo.OriginalURL, doer); err != nil {
+				return err
+			}
+		}
+	}
+
 	log.Trace("migrating git data from %s", repo.CloneURL)
 	messenger("repo.migrate.migrating_git")
 	if err = uploader.CreateRepo(repo, opts); err != nil {