From patchwork Sun Jul 28 00:25:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mikhail Ivanov X-Patchwork-Id: 13743824 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6C9A1B676; Sun, 28 Jul 2024 00:26:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.255 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722126388; cv=none; b=EwkH3lA8JtlLwVJCgJfLwyMDhW3sLV7i0de8hoI4pCQ2RSWUPSePeVl+VjAYZiFEhpqs3JgmX1YMaIryYvj2DP/VrYgOsIFQMyFqY5d/Z0zjn5BRBzwJeDAioInYyKLa8glGi57OivIpckFC/+txz4QPXZ1QunuvrxOqiaoepQg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722126388; c=relaxed/simple; bh=sbsAmMH2Do9sbVqtKEAT3otrqWu0IWd9rsy6FrLSOhY=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Ap1AQkKw86Q+sCoiGynjhw+9kqe/gX9usRp/iKlnv8OkLgl8BDJRVG8ENTL0kIuJrTgnFALkcT9+4xSMreaPlsYOJBa3KeEOf2UQog2wG3dj4KJCxBXpZOryWB7KayexNJVrsgbevNAuKGOjKGrc+aJlL6vRUsnDVgLuEf+he5s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei-partners.com; spf=pass smtp.mailfrom=huawei-partners.com; arc=none smtp.client-ip=45.249.212.255 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei-partners.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei-partners.com Received: from mail.maildlp.com (unknown [172.19.163.252]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4WWj2w3xzGz1L9Cq; Sun, 28 Jul 2024 08:26:16 +0800 (CST) Received: from dggpemm500020.china.huawei.com (unknown [7.185.36.49]) by mail.maildlp.com (Postfix) with ESMTPS id 5A2B41800A4; Sun, 28 Jul 2024 08:26:23 +0800 (CST) Received: from mscphis02103.huawei.com (10.123.65.215) by dggpemm500020.china.huawei.com (7.185.36.49) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Sun, 28 Jul 2024 08:26:21 +0800 From: Mikhail Ivanov To: CC: , , , , , , , Subject: [RFC PATCH v1 6/9] selftests/landlock: Test listening without explicit bind restriction Date: Sun, 28 Jul 2024 08:25:59 +0800 Message-ID: <20240728002602.3198398-7-ivanov.mikhail1@huawei-partners.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240728002602.3198398-1-ivanov.mikhail1@huawei-partners.com> References: <20240728002602.3198398-1-ivanov.mikhail1@huawei-partners.com> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: mscpeml100004.china.huawei.com (7.188.51.133) To dggpemm500020.china.huawei.com (7.185.36.49) Test scenarios where listen(2) call without explicit bind(2) is allowed and forbidden. Signed-off-by: Mikhail Ivanov --- tools/testing/selftests/landlock/net_test.c | 83 +++++++++++++++++++++ 1 file changed, 83 insertions(+) diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c index a8385f1373f6..1a4c4d1cabc2 100644 --- a/tools/testing/selftests/landlock/net_test.c +++ b/tools/testing/selftests/landlock/net_test.c @@ -1842,6 +1842,89 @@ TEST_F(port_specific, bind_connect_zero) EXPECT_EQ(0, close(bind_fd)); } +TEST_F(port_specific, listen_without_bind_allowed) +{ + if (variant->sandbox == TCP_SANDBOX) { + const struct landlock_ruleset_attr ruleset_attr = { + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_LISTEN_TCP + }; + const struct landlock_net_port_attr tcp_listen_zero = { + .allowed_access = LANDLOCK_ACCESS_NET_LISTEN_TCP, + .port = 0, + }; + int ruleset_fd; + + ruleset_fd = landlock_create_ruleset(&ruleset_attr, + sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd); + + /* + * Allow listening without explicit bind + * (cf. landlock_net_port_attr). + */ + EXPECT_EQ(0, + landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, + &tcp_listen_zero, 0)); + + enforce_ruleset(_metadata, ruleset_fd); + EXPECT_EQ(0, close(ruleset_fd)); + } + int listen_fd, connect_fd; + __u64 port; + + listen_fd = socket_variant(&self->srv0); + ASSERT_LE(0, listen_fd); + + connect_fd = socket_variant(&self->srv0); + ASSERT_LE(0, connect_fd); + /* + * Allow listen(2) to select a random port for the socket, + * since bind(2) wasn't called. + */ + EXPECT_EQ(0, listen_variant(listen_fd, backlog)); + + /* Connects on the binded port. */ + port = get_binded_port(listen_fd, &variant->prot); + EXPECT_NE(0, port); + set_port(&self->srv0, port); + EXPECT_EQ(0, connect_variant(connect_fd, &self->srv0)); + + EXPECT_EQ(0, close(connect_fd)); + EXPECT_EQ(0, close(listen_fd)); +} + +TEST_F(port_specific, listen_without_bind_denied) +{ + if (variant->sandbox == TCP_SANDBOX) { + const struct landlock_ruleset_attr ruleset_attr = { + .handled_access_net = LANDLOCK_ACCESS_NET_LISTEN_TCP + }; + int ruleset_fd; + + ruleset_fd = landlock_create_ruleset(&ruleset_attr, + sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd); + + /* Deny listening. */ + enforce_ruleset(_metadata, ruleset_fd); + EXPECT_EQ(0, close(ruleset_fd)); + } + int listen_fd, ret; + + listen_fd = socket_variant(&self->srv0); + ASSERT_LE(0, listen_fd); + + /* Checks that listening without explicit binding is prohibited. */ + ret = listen_variant(listen_fd, backlog); + if (is_restricted(&variant->prot, variant->sandbox)) { + /* Denied by Landlock. */ + EXPECT_EQ(-EACCES, ret); + } else { + EXPECT_EQ(0, ret); + } +} + TEST_F(port_specific, port_1023) { int bind_fd, connect_fd, ret;