From patchwork Mon Aug 29 17:03:56 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: 12958250 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 3A6FAC6FA84 for ; Mon, 29 Aug 2022 17:05:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231238AbiH2RFf (ORCPT ); Mon, 29 Aug 2022 13:05:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37808 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231331AbiH2REx (ORCPT ); Mon, 29 Aug 2022 13:04:53 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 42D719C8EC; Mon, 29 Aug 2022 10:04:32 -0700 (PDT) Received: from fraeml705-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4MGcGj0kn8z67ZgK; Tue, 30 Aug 2022 01:03:57 +0800 (CST) Received: from lhrpeml500004.china.huawei.com (7.191.163.9) by fraeml705-chm.china.huawei.com (10.206.15.54) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2375.31; Mon, 29 Aug 2022 19:04:29 +0200 Received: from mscphis00759.huawei.com (10.123.66.134) by lhrpeml500004.china.huawei.com (7.191.163.9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 29 Aug 2022 18:04:28 +0100 From: Konstantin Meskhidze To: CC: , , , , , , , Subject: [PATCH v7 13/18] seltests/landlock: add AF_UNSPEC family test Date: Tue, 30 Aug 2022 01:03:56 +0800 Message-ID: <20220829170401.834298-14-konstantin.meskhidze@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220829170401.834298-1-konstantin.meskhidze@huawei.com> References: <20220829170401.834298-1-konstantin.meskhidze@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.123.66.134] X-ClientProxiedBy: mscpeml100002.china.huawei.com (7.188.26.75) To lhrpeml500004.china.huawei.com (7.191.163.9) X-CFilter-Loop: Reflected Precedence: bulk List-ID: Adds two selftests for connect() action with AF_UNSPEC family flag. The one is with no landlock restrictions allows to disconnect already connected socket with connect(..., AF_UNSPEC, ...): - connect_afunspec_no_restictions; The second one refuses landlocked process to disconnect already connected socket: - connect_afunspec_with_restictions; Signed-off-by: Konstantin Meskhidze --- Changes since v6: * None. Changes since v5: * Formats code with clang-format-14. Changes since v4: * Refactors code with self->port, self->addr4 variables. * Adds bind() hook check for with AF_UNSPEC family. Changes since v3: * Adds connect_afunspec_no_restictions test. * Adds connect_afunspec_with_restictions test. --- tools/testing/selftests/landlock/net_test.c | 113 ++++++++++++++++++++ 1 file changed, 113 insertions(+) -- 2.25.1 diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c index 9c3d1e425439..40aef7c683af 100644 --- a/tools/testing/selftests/landlock/net_test.c +++ b/tools/testing/selftests/landlock/net_test.c @@ -351,4 +351,117 @@ TEST_F(socket, connect_with_restrictions) ASSERT_EQ(1, WIFEXITED(status)); ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status)); } + +TEST_F(socket, connect_afunspec_no_restictions) +{ + int sockfd; + pid_t child; + int status; + + /* Creates a server socket 1. */ + sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd); + + /* Binds the socket 1 to address with port[0]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd, self, 0)); + + /* Makes connection to the socket with port[0]. */ + ASSERT_EQ(0, connect_variant(variant, sockfd, self, 0)); + + child = fork(); + ASSERT_LE(0, child); + if (child == 0) { + struct sockaddr addr_unspec = { .sa_family = AF_UNSPEC }; + + /* Child tries to disconnect already connected socket. */ + ASSERT_EQ(0, connect(sockfd, (struct sockaddr *)&addr_unspec, + sizeof(addr_unspec))); + _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); + return; + } + /* Closes listening socket 1 for the parent. */ + ASSERT_EQ(0, close(sockfd)); + + ASSERT_EQ(child, waitpid(child, &status, 0)); + ASSERT_EQ(1, WIFEXITED(status)); + ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status)); +} + +TEST_F(socket, connect_afunspec_with_restictions) +{ + int sockfd; + pid_t child; + int status; + + struct landlock_ruleset_attr ruleset_attr_1 = { + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP, + }; + struct landlock_net_service_attr net_service_1 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, + + .port = self->port[0], + }; + + struct landlock_ruleset_attr ruleset_attr_2 = { + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + }; + struct landlock_net_service_attr net_service_2 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + + .port = self->port[0], + }; + + const int ruleset_fd_1 = landlock_create_ruleset( + &ruleset_attr_1, sizeof(ruleset_attr_1), 0); + ASSERT_LE(0, ruleset_fd_1); + + /* Allows bind operations to the port[0] socket. */ + ASSERT_EQ(0, landlock_add_rule(ruleset_fd_1, LANDLOCK_RULE_NET_SERVICE, + &net_service_1, 0)); + + /* Enforces the ruleset. */ + enforce_ruleset(_metadata, ruleset_fd_1); + + /* Creates a server socket 1. */ + sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd); + + /* Binds the socket 1 to address with port[0]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd, self, 0)); + + /* Makes connection to socket with port[0]. */ + ASSERT_EQ(0, connect_variant(variant, sockfd, self, 0)); + + const int ruleset_fd_2 = landlock_create_ruleset( + &ruleset_attr_2, sizeof(ruleset_attr_2), 0); + ASSERT_LE(0, ruleset_fd_2); + + /* Allows connect and bind operations to the port[0] socket. */ + ASSERT_EQ(0, landlock_add_rule(ruleset_fd_2, LANDLOCK_RULE_NET_SERVICE, + &net_service_2, 0)); + + /* Enforces the ruleset. */ + enforce_ruleset(_metadata, ruleset_fd_2); + + child = fork(); + ASSERT_LE(0, child); + if (child == 0) { + struct sockaddr addr_unspec = { .sa_family = AF_UNSPEC }; + + /* Child tries to disconnect already connected socket. */ + ASSERT_EQ(-1, connect(sockfd, (struct sockaddr *)&addr_unspec, + sizeof(addr_unspec))); + ASSERT_EQ(EACCES, errno); + _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); + return; + } + /* Closes listening socket 1 for the parent. */ + ASSERT_EQ(0, close(sockfd)); + + ASSERT_EQ(child, waitpid(child, &status, 0)); + ASSERT_EQ(1, WIFEXITED(status)); + ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status)); +} TEST_HARNESS_MAIN