From patchwork Fri Oct 21 15:26:42 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: 13014946 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 C01E1C352A1 for ; Fri, 21 Oct 2022 15:27:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230009AbiJUP10 (ORCPT ); Fri, 21 Oct 2022 11:27:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230369AbiJUP1W (ORCPT ); Fri, 21 Oct 2022 11:27:22 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D06425ED2A; Fri, 21 Oct 2022 08:27:15 -0700 (PDT) Received: from fraeml744-chm.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Mv7ZY6Ykqz688y7; Fri, 21 Oct 2022 23:25:25 +0800 (CST) Received: from lhrpeml500004.china.huawei.com (7.191.163.9) by fraeml744-chm.china.huawei.com (10.206.15.225) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Fri, 21 Oct 2022 17:27:13 +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 15.1.2375.31; Fri, 21 Oct 2022 16:27:12 +0100 From: Konstantin Meskhidze To: CC: , , , , , Subject: [PATCH v8 10/12] selftests/landlock: Add 10 new test suites dedicated to network Date: Fri, 21 Oct 2022 23:26:42 +0800 Message-ID: <20221021152644.155136-11-konstantin.meskhidze@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221021152644.155136-1-konstantin.meskhidze@huawei.com> References: <20221021152644.155136-1-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: These test suites try to check edge cases for TCP sockets bind() and connect() actions. socket: * bind_no_restrictions: Tests with non-landlocked ipv4 and ipv6 sockets. * bind_with_restrictions: Tests with mixed landlock rules for ipv4 and ipv6 sockets. * connect_no_restrictions: Tests with non-landlocked ipv4 and ipv6 sockets. * connect_with_restrictions: Tests with mixed landlock rules for ipv4 and ipv6 sockets. * connect_afunspec_no_restrictions: Tests with no landlock restrictions allowing to disconnect already connected socket with AF_UNSPEC socket family. * connect_afunspec_with_restrictions: Tests with landlocked process refusing to disconnect already connected socket. * ruleset_overlap: Tests with overlapping rules for one port. * ruleset_expanding: Tests with expanding rulesets in which rules are gradually added one by one, restricting sockets' connections. * inval: Tests with invalid user space supplied data: - out of range ruleset attribute; - unhandled allowed access; - zero port value; - zero access value; - legitimate access values; layout1: * with_net: Tests with network bind() socket action within filesystem directory access test. Test coverage for security/landlock is 94.3% of 920 lines according to gcc/gcov-11. Signed-off-by: Konstantin Meskhidze --- Changes since v7: * Squashes all selftest commits. * Adds fs test with network bind() socket action. * Minor fixes. --- security/landlock/ruleset.h | 2 - tools/testing/selftests/landlock/config | 4 + tools/testing/selftests/landlock/fs_test.c | 65 ++ tools/testing/selftests/landlock/net_test.c | 823 ++++++++++++++++++++ 4 files changed, 892 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/landlock/net_test.c -- 2.25.1 diff --git a/security/landlock/ruleset.h b/security/landlock/ruleset.h index f272d2cd518c..ee1a02a404ce 100644 --- a/security/landlock/ruleset.h +++ b/security/landlock/ruleset.h @@ -264,7 +264,6 @@ landlock_add_fs_access_mask(struct landlock_ruleset *const ruleset, /* Should already be checked in sys_landlock_create_ruleset(). */ WARN_ON_ONCE(fs_access_mask != fs_mask); - // TODO: Add tests to check "|=" and not "=" ruleset->access_masks[layer_level] |= (fs_mask << LANDLOCK_SHIFT_ACCESS_FS); } @@ -278,7 +277,6 @@ landlock_add_net_access_mask(struct landlock_ruleset *const ruleset, /* Should already be checked in sys_landlock_create_ruleset(). */ WARN_ON_ONCE(net_access_mask != net_mask); - // TODO: Add tests to check "|=" and not "=" ruleset->access_masks[layer_level] |= (net_mask << LANDLOCK_SHIFT_ACCESS_NET); } diff --git a/tools/testing/selftests/landlock/config b/tools/testing/selftests/landlock/config index 0f0a65287bac..71f7e9a8a64c 100644 --- a/tools/testing/selftests/landlock/config +++ b/tools/testing/selftests/landlock/config @@ -1,3 +1,7 @@ +CONFIG_INET=y +CONFIG_IPV6=y +CONFIG_NET=y +CONFIG_NET_NS=y CONFIG_OVERLAY_FS=y CONFIG_SECURITY_LANDLOCK=y CONFIG_SECURITY_PATH=y diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c index 20c1ac8485f1..5c52da1a5a69 100644 --- a/tools/testing/selftests/landlock/fs_test.c +++ b/tools/testing/selftests/landlock/fs_test.c @@ -8,14 +8,17 @@ */ #define _GNU_SOURCE +#include #include #include +#include #include #include #include #include #include #include +#include #include #include #include @@ -4366,4 +4369,66 @@ TEST_F_FORK(layout2_overlay, same_content_different_file) } } +#define IP_ADDRESS "127.0.0.1" + +TEST_F_FORK(layout1, with_net) +{ + int sockfd; + int sock_port = 15000; + struct sockaddr_in addr4; + + addr4.sin_family = AF_INET; + addr4.sin_port = htons(sock_port); + addr4.sin_addr.s_addr = inet_addr(IP_ADDRESS); + memset(&addr4.sin_zero, '\0', 8); + + const struct rule rules[] = { + { + .path = dir_s1d2, + .access = ACCESS_RO, + }, + {}, + }; + + struct landlock_ruleset_attr ruleset_attr_net = { + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + }; + struct landlock_net_service_attr net_service = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, + + .port = sock_port, + }; + + /* Creates ruleset for network access. */ + const int ruleset_fd_net = landlock_create_ruleset( + &ruleset_attr_net, sizeof(ruleset_attr_net), 0); + ASSERT_LE(0, ruleset_fd_net); + + /* Adds a network rule. */ + ASSERT_EQ(0, + landlock_add_rule(ruleset_fd_net, LANDLOCK_RULE_NET_SERVICE, + &net_service, 0)); + + enforce_ruleset(_metadata, ruleset_fd_net); + ASSERT_EQ(0, close(ruleset_fd_net)); + + const int ruleset_fd = create_ruleset(_metadata, ACCESS_RW, rules); + ASSERT_LE(0, ruleset_fd); + enforce_ruleset(_metadata, ruleset_fd); + ASSERT_EQ(0, close(ruleset_fd)); + + /* Tests on a directory with the network rule loaded. */ + ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY)); + ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY)); + + sockfd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0); + ASSERT_LE(0, sockfd); + /* Binds a socket to port 15000. */ + ASSERT_EQ(0, bind(sockfd, &addr4, sizeof(addr4))); + + /* Closes bounded socket. */ + ASSERT_EQ(0, close(sockfd)); +} + TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c new file mode 100644 index 000000000000..d1548bd7ab60 --- /dev/null +++ b/tools/testing/selftests/landlock/net_test.c @@ -0,0 +1,823 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Landlock tests - Network + * + * Copyright (C) 2022 Huawei Tech. Co., Ltd. + */ + +#define _GNU_SOURCE +#include +#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" + +/* Number pending connections queue to be hold. */ +#define BACKLOG 10 + +const struct sockaddr addr_unspec = { .sa_family = AF_UNSPEC }; + +/* Invalid attribute, out of landlock network access range. */ +#define LANDLOCK_INVAL_ATTR 7 + +FIXTURE(socket) +{ + uint port[MAX_SOCKET_NUM]; + struct sockaddr_in addr4[MAX_SOCKET_NUM]; + struct sockaddr_in6 addr6[MAX_SOCKET_NUM]; +}; + +/* struct _fixture_variant_socket */ +FIXTURE_VARIANT(socket) +{ + const bool is_ipv4; +}; + +/* clang-format off */ +FIXTURE_VARIANT_ADD(socket, ipv4) { + /* clang-format on */ + .is_ipv4 = true, +}; + +/* clang-format off */ +FIXTURE_VARIANT_ADD(socket, ipv6) { + /* clang-format on */ + .is_ipv4 = false, +}; + +static int +create_socket_variant(const struct _fixture_variant_socket *const variant, + const int type) +{ + if (variant->is_ipv4) + return socket(AF_INET, type | SOCK_CLOEXEC, 0); + else + return socket(AF_INET6, type | SOCK_CLOEXEC, 0); +} + +static int bind_variant(const struct _fixture_variant_socket *const variant, + const int sockfd, + const struct _test_data_socket *const self, + const size_t index) +{ + if (variant->is_ipv4) + return bind(sockfd, &self->addr4[index], + sizeof(self->addr4[index])); + else + return bind(sockfd, &self->addr6[index], + sizeof(self->addr6[index])); +} + +static int connect_variant(const struct _fixture_variant_socket *const variant, + const int sockfd, + const struct _test_data_socket *const self, + const size_t index) +{ + if (variant->is_ipv4) + return connect(sockfd, &self->addr4[index], + sizeof(self->addr4[index])); + else + return connect(sockfd, &self->addr6[index], + sizeof(self->addr6[index])); +} + +FIXTURE_SETUP(socket) +{ + int i; + + /* Creates IPv4 socket addresses. */ + for (i = 0; i < MAX_SOCKET_NUM; i++) { + self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD * i; + self->addr4[i].sin_family = AF_INET; + self->addr4[i].sin_port = htons(self->port[i]); + self->addr4[i].sin_addr.s_addr = inet_addr(IP_ADDRESS); + memset(&(self->addr4[i].sin_zero), '\0', 8); + } + + /* Creates IPv6 socket addresses. */ + for (i = 0; i < MAX_SOCKET_NUM; i++) { + self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD * i; + self->addr6[i].sin6_family = AF_INET6; + self->addr6[i].sin6_port = htons(self->port[i]); + inet_pton(AF_INET6, IP_ADDRESS, &(self->addr6[i].sin6_addr)); + } + + set_cap(_metadata, CAP_SYS_ADMIN); + ASSERT_EQ(0, unshare(CLONE_NEWNET)); + ASSERT_EQ(0, system("ip link set dev lo up")); + clear_cap(_metadata, CAP_SYS_ADMIN); +} + +FIXTURE_TEARDOWN(socket) +{ +} + +TEST_F_FORK(socket, bind_no_restrictions) +{ + int sockfd; + + sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd); + + /* Binds a socket to port[0]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd, self, 0)); + + ASSERT_EQ(0, close(sockfd)); +} + +TEST_F_FORK(socket, bind_with_restrictions) +{ + int sockfd; + + 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 = self->port[0], + }; + struct landlock_net_service_attr net_service_2 = { + .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP, + .port = self->port[1], + }; + struct landlock_net_service_attr net_service_3 = { + .allowed_access = 0, + .port = self->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 = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd); + /* Binds a socket to port[0]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd, self, 0)); + + /* Closes bounded socket. */ + ASSERT_EQ(0, close(sockfd)); + + sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd); + /* Binds a socket to port[1]. */ + ASSERT_EQ(-1, bind_variant(variant, sockfd, self, 1)); + ASSERT_EQ(EACCES, errno); + + sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd); + /* Binds a socket to port[2]. */ + ASSERT_EQ(-1, bind_variant(variant, sockfd, self, 2)); + ASSERT_EQ(EACCES, errno); +} + +TEST_F_FORK(socket, connect_no_restrictions) +{ + int sockfd, new_fd; + pid_t child; + int status; + + /* Creates a server socket. */ + sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd); + + /* Binds a socket to port[0]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd, self, 0)); + + /* Makes listening socket. */ + ASSERT_EQ(0, listen(sockfd, BACKLOG)); + + child = fork(); + ASSERT_LE(0, child); + if (child == 0) { + int child_sockfd; + + /* Closes listening socket for the child. */ + ASSERT_EQ(0, close(sockfd)); + /* Creates a stream client socket. */ + child_sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, child_sockfd); + + /* Makes connection to the listening socket with port[0]. */ + ASSERT_EQ(0, connect_variant(variant, child_sockfd, self, 0)); + _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); + return; + } + /* Accepts connection from the child. */ + new_fd = accept(sockfd, NULL, 0); + ASSERT_LE(0, new_fd); + + /* Closes connection. */ + ASSERT_EQ(0, close(new_fd)); + + /* Closes listening socket 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_FORK(socket, connect_with_restrictions) +{ + int new_fd; + int sockfd_1, sockfd_2; + pid_t child_1, child_2; + int status; + + 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 = self->port[0], + }; + struct landlock_net_service_attr net_service_2 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, + .port = self->port[1], + }; + + 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)); + + /* Enforces the ruleset. */ + enforce_ruleset(_metadata, ruleset_fd); + + /* Creates a server socket 1. */ + sockfd_1 = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd_1); + + /* Binds the socket 1 to address with port[0]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd_1, self, 0)); + + /* Makes listening socket 1. */ + ASSERT_EQ(0, listen(sockfd_1, BACKLOG)); + + child_1 = fork(); + ASSERT_LE(0, child_1); + if (child_1 == 0) { + int child_sockfd; + + /* Closes listening socket for the child. */ + ASSERT_EQ(0, close(sockfd_1)); + /* Creates a stream client socket. */ + child_sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, child_sockfd); + + /* Makes connection to the listening socket with port[0]. */ + ASSERT_EQ(0, connect_variant(variant, child_sockfd, self, 0)); + _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); + return; + } + /* Accepts connection from the child 1. */ + new_fd = accept(sockfd_1, NULL, 0); + ASSERT_LE(0, new_fd); + + /* Closes connection. */ + ASSERT_EQ(0, close(new_fd)); + + /* Closes listening socket 1 for the parent. */ + ASSERT_EQ(0, close(sockfd_1)); + + ASSERT_EQ(child_1, waitpid(child_1, &status, 0)); + ASSERT_EQ(1, WIFEXITED(status)); + ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status)); + + /* Creates a server socket 2. */ + sockfd_2 = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd_2); + + /* Binds the socket 2 to address with port[1]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd_2, self, 1)); + + /* Makes listening socket 2. */ + ASSERT_EQ(0, listen(sockfd_2, BACKLOG)); + + child_2 = fork(); + ASSERT_LE(0, child_2); + if (child_2 == 0) { + int child_sockfd; + + /* Closes listening socket for the child. */ + ASSERT_EQ(0, close(sockfd_2)); + /* Creates a stream client socket. */ + child_sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, child_sockfd); + + /* Makes connection to the listening socket with port[1]. */ + ASSERT_EQ(-1, connect_variant(variant, child_sockfd, self, 1)); + ASSERT_EQ(EACCES, errno); + _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); + return; + } + + /* Closes listening socket 2 for the parent. */ + ASSERT_EQ(0, close(sockfd_2)); + + ASSERT_EQ(child_2, waitpid(child_2, &status, 0)); + ASSERT_EQ(1, WIFEXITED(status)); + ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status)); +} + +TEST_F_FORK(socket, connect_afunspec_no_restrictions) +{ + 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) { + /* 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_FORK(socket, connect_afunspec_with_restrictions) +{ + 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) { + /* 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_F_FORK(socket, ruleset_overlap) +{ + int sockfd; + int one = 1; + + 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, + + .port = self->port[0], + }; + + struct landlock_net_service_attr net_service_2 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + + .port = self->port[0], + }; + + int ruleset_fd = + landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd); + + /* Allows 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 bind operations to the port[0] socket. */ + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE, + &net_service_2, 0)); + + /* Enforces the ruleset. */ + enforce_ruleset(_metadata, ruleset_fd); + + /* Creates a server socket. */ + sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd); + /* Allows to reuse of local address. */ + ASSERT_EQ(0, setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &one, + sizeof(one))); + + /* Binds the socket 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)); + + /* Closes socket. */ + ASSERT_EQ(0, close(sockfd)); + + /* Creates another ruleset layer. */ + ruleset_fd = + landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd); + + /* + * Allows bind operations to the port[0] socket in + * the new ruleset layer. + */ + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE, + &net_service_1, 0)); + + /* Enforces the new ruleset. */ + enforce_ruleset(_metadata, ruleset_fd); + + /* Creates a server socket. */ + sockfd = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd); + /* Allows to reuse of local address. */ + ASSERT_EQ(0, setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &one, + sizeof(one))); + + /* Binds the socket to address with port[0]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd, self, 0)); + + /* + * Forbids to connect the socket to address with port[0], + * as just one ruleset layer has connect() access rule. + */ + ASSERT_EQ(-1, connect_variant(variant, sockfd, self, 0)); + ASSERT_EQ(EACCES, errno); + + /* Closes socket. */ + ASSERT_EQ(0, close(sockfd)); +} + +TEST_F_FORK(socket, ruleset_expanding) +{ + int sockfd_1, sockfd_2; + int one = 1; + + 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], + }; + + const int ruleset_fd_1 = landlock_create_ruleset( + &ruleset_attr_1, sizeof(ruleset_attr_1), 0); + ASSERT_LE(0, ruleset_fd_1); + + /* Adds rule to 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); + ASSERT_EQ(0, close(ruleset_fd_1)); + + /* Creates a socket 1. */ + sockfd_1 = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd_1); + /* Allows to reuse of local address. */ + ASSERT_EQ(0, setsockopt(sockfd_1, SOL_SOCKET, SO_REUSEADDR, &one, + sizeof(one))); + + /* Binds the socket 1 to address with port[0]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd_1, self, 0)); + + /* Makes connection to socket 1 with port[0]. */ + ASSERT_EQ(0, connect_variant(variant, sockfd_1, self, 0)); + + /* Closes socket 1. */ + ASSERT_EQ(0, close(sockfd_1)); + + /* Creates a socket 2. */ + sockfd_2 = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd_2); + /* Allows to reuse of local address. */ + ASSERT_EQ(0, setsockopt(sockfd_2, SOL_SOCKET, SO_REUSEADDR, &one, + sizeof(one))); + + /* + * Forbids to bind the socket 2 to address with port[1], + * since there is no rule with bind() access for port[1]. + */ + ASSERT_EQ(-1, bind_variant(variant, sockfd_2, self, 1)); + ASSERT_EQ(EACCES, errno); + + /* Expands network mask. */ + struct landlock_ruleset_attr ruleset_attr_2 = { + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + }; + + /* Adds connect() access to port[0]. */ + struct landlock_net_service_attr net_service_2 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + + .port = self->port[0], + }; + /* Adds bind() access to port[1]. */ + struct landlock_net_service_attr net_service_3 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, + + .port = self->port[1], + }; + + const int ruleset_fd_2 = landlock_create_ruleset( + &ruleset_attr_2, sizeof(ruleset_attr_2), 0); + ASSERT_LE(0, ruleset_fd_2); + + /* Adds rule to port[0] socket. */ + ASSERT_EQ(0, landlock_add_rule(ruleset_fd_2, LANDLOCK_RULE_NET_SERVICE, + &net_service_2, 0)); + /* Adds rule to port[1] socket. */ + ASSERT_EQ(0, landlock_add_rule(ruleset_fd_2, LANDLOCK_RULE_NET_SERVICE, + &net_service_3, 0)); + + /* Enforces the ruleset. */ + enforce_ruleset(_metadata, ruleset_fd_2); + ASSERT_EQ(0, close(ruleset_fd_2)); + + /* Creates a socket 1. */ + sockfd_1 = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd_1); + /* Allows to reuse of local address. */ + ASSERT_EQ(0, setsockopt(sockfd_1, SOL_SOCKET, SO_REUSEADDR, &one, + sizeof(one))); + + /* Binds the socket 1 to address with port[0]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd_1, self, 0)); + + /* Makes connection to socket 1 with port[0]. */ + ASSERT_EQ(0, connect_variant(variant, sockfd_1, self, 0)); + + /* Closes socket 1. */ + ASSERT_EQ(0, close(sockfd_1)); + + /* Creates a socket 2. */ + sockfd_2 = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd_2); + /* Allows to reuse of local address. */ + ASSERT_EQ(0, setsockopt(sockfd_2, SOL_SOCKET, SO_REUSEADDR, &one, + sizeof(one))); + + /* + * Forbids to bind the socket 2 to address with port[1], + * because just one layer has bind() access rule. + */ + ASSERT_EQ(-1, bind_variant(variant, sockfd_1, self, 1)); + ASSERT_EQ(EACCES, errno); + + /* Expands network mask. */ + struct landlock_ruleset_attr ruleset_attr_3 = { + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + }; + + /* Restricts connect() access to port[0]. */ + struct landlock_net_service_attr net_service_4 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, + + .port = self->port[0], + }; + + const int ruleset_fd_3 = landlock_create_ruleset( + &ruleset_attr_3, sizeof(ruleset_attr_3), 0); + ASSERT_LE(0, ruleset_fd_3); + + /* Adds rule to port[0] socket. */ + ASSERT_EQ(0, landlock_add_rule(ruleset_fd_3, LANDLOCK_RULE_NET_SERVICE, + &net_service_4, 0)); + + /* Enforces the ruleset. */ + enforce_ruleset(_metadata, ruleset_fd_3); + ASSERT_EQ(0, close(ruleset_fd_3)); + + /* Creates a socket 1. */ + sockfd_1 = create_socket_variant(variant, SOCK_STREAM); + ASSERT_LE(0, sockfd_1); + /* Allows to reuse of local address. */ + ASSERT_EQ(0, setsockopt(sockfd_1, SOL_SOCKET, SO_REUSEADDR, &one, + sizeof(one))); + + /* Binds the socket 1 to address with port[0]. */ + ASSERT_EQ(0, bind_variant(variant, sockfd_1, self, 0)); + + /* + * Forbids to connect the socket 1 to address with port[0], + * as just one layer has connect() access rule. + */ + ASSERT_EQ(-1, connect_variant(variant, sockfd_1, self, 0)); + ASSERT_EQ(EACCES, errno); + + /* Closes socket 1. */ + ASSERT_EQ(0, close(sockfd_1)); +} + +/* clang-format off */ + +#define ACCESS_LAST LANDLOCK_ACCESS_NET_CONNECT_TCP + +#define ACCESS_ALL ( \ + LANDLOCK_ACCESS_NET_BIND_TCP | \ + LANDLOCK_ACCESS_NET_CONNECT_TCP) + +/* clang-format on */ + +TEST_F_FORK(socket, inval) +{ + __u64 access; + + struct landlock_ruleset_attr ruleset_attr = { + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP + }; + struct landlock_ruleset_attr ruleset_attr_inval = { + .handled_access_net = LANDLOCK_INVAL_ATTR + }; + struct landlock_ruleset_attr ruleset_attr_all = { .handled_access_net = + ACCESS_ALL }; + + struct landlock_net_service_attr net_service_1 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | + LANDLOCK_ACCESS_NET_CONNECT_TCP, + .port = self->port[0], + }; + struct landlock_net_service_attr net_service_2 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, + .port = 0, + }; + struct landlock_net_service_attr net_service_3 = { + .allowed_access = 0, + .port = self->port[1], + }; + struct landlock_net_service_attr net_service_4 = { + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, + .port = self->port[2], + }; + + struct landlock_net_service_attr net_service_5 = {}; + + /* Checks invalid ruleset attribute. */ + const int ruleset_fd_inv = landlock_create_ruleset( + &ruleset_attr_inval, sizeof(ruleset_attr_inval), 0); + ASSERT_EQ(-1, ruleset_fd_inv); + ASSERT_EQ(EINVAL, errno); + + /* Gets ruleset. */ + const int ruleset_fd = + landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); + ASSERT_LE(0, ruleset_fd); + + /* Checks unhandled allowed_access. */ + ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE, + &net_service_1, 0)); + ASSERT_EQ(EINVAL, errno); + + /* Checks zero port value. */ + ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE, + &net_service_2, 0)); + ASSERT_EQ(EINVAL, errno); + + /* Checks zero access value. */ + ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE, + &net_service_3, 0)); + ASSERT_EQ(ENOMSG, errno); + + /* Adds with legitimate values. */ + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE, + &net_service_4, 0)); + + const int ruleset_fd_all = landlock_create_ruleset( + &ruleset_attr_all, sizeof(ruleset_attr_all), 0); + + ASSERT_LE(0, ruleset_fd_all); + + /* Tests access rights for all network rules */ + for (access = 1; access <= ACCESS_LAST; access <<= 1) { + net_service_5.allowed_access = access; + net_service_5.port = self->port[3]; + + ASSERT_EQ(0, landlock_add_rule(ruleset_fd_all, + LANDLOCK_RULE_NET_SERVICE, + &net_service_5, 0)); + } + + /* Enforces the ruleset. */ + enforce_ruleset(_metadata, ruleset_fd); + ASSERT_EQ(0, close(ruleset_fd)); + + enforce_ruleset(_metadata, ruleset_fd_all); + ASSERT_EQ(0, close(ruleset_fd_all)); +} +TEST_HARNESS_MAIN