repo-settings: ensure deletion on repo settings model validate

the settings id against the initialized model repo.

- prevents from malicious deletions of settings by forgin IDs

rhodecode/model/settings.py

@@ -44,8 +44,9 b" SOCIAL_PLUGINS_LIST = ['github', 'bitbuc"
 
 
 class SettingNotFound(Exception):
-    def __init__(self):
-        super(SettingNotFound, self).__init__('Setting is not found')
+    def __init__(self, setting_id):
+        msg = 'Setting `{}` is not found'.format(setting_id)
+        super(SettingNotFound, self).__init__(msg)
 
 
 class SettingsModel(BaseModel):
@@ -155,7 +156,7 b' class SettingsModel(BaseModel):'
     def delete_ui(self, id_):
         ui = self.UiDbModel.get(id_)
         if not ui:
-            raise SettingNotFound()
+            raise SettingNotFound(id_)
         Session().delete(ui)
 
     def get_setting_by_name(self, name):
@@ -635,7 +636,13 b' class VcsSettingsModel(object):'
 
     @assert_repo_settings
     def delete_repo_svn_pattern(self, id_):
-        self.repo_settings.delete_ui(id_)
+        ui = self.repo_settings.UiDbModel.get(id_)
+        if ui and ui.repository.repo_name == self.repo_settings.repo:
+            # only delete if it's the same repo as initialized settings
+            self.repo_settings.delete_ui(id_)
+        else:
+            # raise error as if we wouldn't find this option
+            self.repo_settings.delete_ui(-1)
 
     def delete_global_svn_pattern(self, id_):
         self.global_settings.delete_ui(id_)

rhodecode/tests/models/settings/test_settings.py

@@ -491,7 +491,7 b' class TestDeleteUiValue(object):'
         model = SettingsModel()
         with pytest.raises(SettingNotFound) as exc_info:
             model.delete_ui(id_)
-        assert exc_info.value.message == 'Setting is not found'
+        assert exc_info.value.message == 'Setting `{}` is not found'.format(id_)
 
     def test_delete_ui_when_repo_is_not_set(self, settings_util):
         model = SettingsModel()

rhodecode/tests/models/settings/test_vcs_settings.py

@@ -635,13 +635,24 b' class TestCreateOrUpdateGlobalGitSetting'
 
 
 class TestDeleteRepoSvnPattern(object):
-    def test_success_when_repo_is_set(self, backend_svn):
+    def test_success_when_repo_is_set(self, backend_svn, settings_util):
+        repo = backend_svn.create_repo()
+        repo_name = repo.repo_name
+
+        model = VcsSettingsModel(repo=repo_name)
+        entry = settings_util.create_repo_rhodecode_ui(
+            repo, VcsSettingsModel.SVN_BRANCH_SECTION, 'svn-branch')
+        Session().commit()
+
+        model.delete_repo_svn_pattern(entry.ui_id)
+
+    def test_fail_when_delete_id_from_other_repo(self, backend_svn):
         repo_name = backend_svn.repo_name
         model = VcsSettingsModel(repo=repo_name)
         delete_ui_patch = mock.patch.object(model.repo_settings, 'delete_ui')
         with delete_ui_patch as delete_ui_mock:
             model.delete_repo_svn_pattern(123)
-        delete_ui_mock.assert_called_once_with(123)
+        delete_ui_mock.assert_called_once_with(-1)
 
     def test_raises_exception_when_repository_is_not_specified(self):
         model = VcsSettingsModel()