From patchwork Wed Mar 9 13:44:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Konstantin Meskhidze (A)" X-Patchwork-Id: 12775096 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8D1DBC433FE for ; Wed, 9 Mar 2022 13:46:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230109AbiCINrB (ORCPT ); Wed, 9 Mar 2022 08:47:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233019AbiCINqb (ORCPT ); Wed, 9 Mar 2022 08:46:31 -0500 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3182D17B8BE; Wed, 9 Mar 2022 05:45:24 -0800 (PST) Received: from fraeml704-chm.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4KDD1g5hg6z6H6mm; Wed, 9 Mar 2022 21:43:51 +0800 (CST) Received: from mscphispre00059.huawei.com (10.123.71.64) by fraeml704-chm.china.huawei.com (10.206.15.53) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.21; Wed, 9 Mar 2022 14:45:21 +0100 From: Konstantin Meskhidze To: CC: , , , , , , Subject: [RFC PATCH v4 10/15] seltest/landlock: add tests for bind() hooks Date: Wed, 9 Mar 2022 21:44:54 +0800 Message-ID: <20220309134459.6448-11-konstantin.meskhidze@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220309134459.6448-1-konstantin.meskhidze@huawei.com> References: <20220309134459.6448-1-konstantin.meskhidze@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.123.71.64] X-ClientProxiedBy: mscpeml500001.china.huawei.com (7.188.26.142) To fraeml704-chm.china.huawei.com (10.206.15.53) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-State: RFC Adds two selftests for bind socket action. The one is with no landlock restrictions: - bind_no_restrictions; The second one is with mixed landlock rules: - bind_with_restrictions; Signed-off-by: Konstantin Meskhidze --- Changes since v3: * Split commit. * Add helper create_socket. * Add FIXTURE_SETUP. --- .../testing/selftests/landlock/network_test.c | 153 ++++++++++++++++++ 1 file changed, 153 insertions(+) create mode 100644 tools/testing/selftests/landlock/network_test.c -- 2.25.1 diff --git a/tools/testing/selftests/landlock/network_test.c b/tools/testing/selftests/landlock/network_test.c new file mode 100644 index 000000000000..4c60f6d973a8 --- /dev/null +++ b/tools/testing/selftests/landlock/network_test.c @@ -0,0 +1,153 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Landlock tests - Network + * + * Copyright (C) 2022 Huawei Tech. Co., Ltd. + * Author: Konstantin Meskhidze + * + */ + +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "common.h" + +#define MAX_SOCKET_NUM 10 + +#define SOCK_PORT_START 3470 +#define SOCK_PORT_ADD 10 + +#define IP_ADDRESS "127.0.0.1" + +uint port[MAX_SOCKET_NUM]; +struct sockaddr_in addr[MAX_SOCKET_NUM]; + +const int one = 1; + +/* Number pending connections queue to be hold */ +#define BACKLOG 10 + +static int create_socket(struct __test_metadata *const _metadata) +{ + + int sockfd; + + sockfd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0); + ASSERT_LE(0, sockfd); + /* Allows to reuse of local address */ + ASSERT_EQ(0, setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))); + + return sockfd; +} + +static void enforce_ruleset(struct __test_metadata *const _metadata, + const int ruleset_fd) +{ + ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)); + ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0)) { + TH_LOG("Failed to enforce ruleset: %s", strerror(errno)); + } +} + +FIXTURE(socket) { }; + +FIXTURE_SETUP(socket) +{ + int i; + /* Creates socket addresses */ + for (i = 0; i < MAX_SOCKET_NUM; i++) { + port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i; + addr[i].sin_family = AF_INET; + addr[i].sin_port = htons(port[i]); + addr[i].sin_addr.s_addr = inet_addr(IP_ADDRESS); + memset(&(addr[i].sin_zero), '\0', 8); + } +} + +FIXTURE_TEARDOWN(socket) +{ } + +TEST_F_FORK(socket, bind_no_restrictions) { + + int sockfd; + + sockfd = create_socket(_metadata); + ASSERT_LE(0, sockfd); + + /* Binds a socket to port[0] */ + ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&addr[0], sizeof(addr[0]))); + + ASSERT_EQ(0, close(sockfd)); +} + +TEST_F_FORK(socket, bind_with_restrictions) { + + int sockfd_1, sockfd_2, sockfd_3; + + struct landlock_ruleset_attr ruleset_attr = { + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + }; + struct landlock_net_service_attr net_service_1 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + .port = port[0], + }; + struct landlock_net_service_attr net_service_2 = { + .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP, + .port = port[1], + }; + struct landlock_net_service_attr net_service_3 = { + .allowed_access = 0, + .port = port[2], + }; + + const int ruleset_fd = landlock_create_ruleset(&ruleset_attr, + sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd); + + /* Allows connect and bind operations to the port[0] socket. */ + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE, + &net_service_1, 0)); + /* Allows connect and deny bind operations to the port[1] socket. */ + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE, + &net_service_2, 0)); + /* Empty allowed_access (i.e. deny rules) are ignored in network actions + * for port[2] socket. + */ + ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE, + &net_service_3, 0)); + ASSERT_EQ(ENOMSG, errno); + + /* Enforces the ruleset. */ + enforce_ruleset(_metadata, ruleset_fd); + + sockfd_1 = create_socket(_metadata); + ASSERT_LE(0, sockfd_1); + /* Binds a socket to port[0] */ + ASSERT_EQ(0, bind(sockfd_1, (struct sockaddr *)&addr[0], sizeof(addr[0]))); + + /* Close bounded socket*/ + ASSERT_EQ(0, close(sockfd_1)); + + sockfd_2 = create_socket(_metadata); + ASSERT_LE(0, sockfd_2); + /* Binds a socket to port[1] */ + ASSERT_EQ(-1, bind(sockfd_2, (struct sockaddr *)&addr[1], sizeof(addr[1]))); + ASSERT_EQ(EACCES, errno); + + sockfd_3 = create_socket(_metadata); + ASSERT_LE(0, sockfd_3); + /* Binds a socket to port[2] */ + ASSERT_EQ(-1, bind(sockfd_3, (struct sockaddr *)&addr[2], sizeof(addr[2]))); + ASSERT_EQ(EACCES, errno); +} +TEST_HARNESS_MAIN