[RFC,v1,3/9] selftests/landlock: Support LANDLOCK_ACCESS_NET_LISTEN_TCP

Message ID	20240728002602.3198398-4-ivanov.mikhail1@huawei-partners.com (mailing list archive)
State	RFC
Headers	show Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) (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 1462810F1; Sun, 28 Jul 2024 00:26:20 +0000 (UTC) From: Mikhail Ivanov <ivanov.mikhail1@huawei-partners.com> To: <mic@digikod.net> CC: <willemdebruijn.kernel@gmail.com>, <gnoack3000@gmail.com>, <linux-security-module@vger.kernel.org>, <netdev@vger.kernel.org>, <netfilter-devel@vger.kernel.org>, <yusongping@huawei.com>, <artem.kuzin@huawei.com>, <konstantin.meskhidze@huawei.com> Subject: [RFC PATCH v1 3/9] selftests/landlock: Support LANDLOCK_ACCESS_NET_LISTEN_TCP Date: Sun, 28 Jul 2024 08:25:56 +0800 Message-ID: <20240728002602.3198398-4-ivanov.mikhail1@huawei-partners.com> In-Reply-To: <20240728002602.3198398-1-ivanov.mikhail1@huawei-partners.com> References: <20240728002602.3198398-1-ivanov.mikhail1@huawei-partners.com> Precedence: bulk MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit
Series	Support TCP listen access-control \| expand [RFC,v1,0/9] Support TCP listen access-control [RFC,v1,1/9] landlock: Refactor current_check_access_socket() access right check [RFC,v1,2/9] landlock: Support TCP listen access-control [RFC,v1,3/9] selftests/landlock: Support LANDLOCK_ACCESS_NET_LISTEN_TCP [RFC,v1,4/9] selftests/landlock: Test listening restriction [RFC,v1,5/9] selftests/landlock: Test listen on connected socket [RFC,v1,6/9] selftests/landlock: Test listening without explicit bind restriction [RFC,v1,7/9] selftests/landlock: Test listen on ULP socket without clone method [RFC,v1,8/9] selftests/landlock: Test changing socket backlog with listen(2) [RFC,v1,9/9] samples/landlock: Support LANDLOCK_ACCESS_NET_LISTEN

Context	Check	Description
netdev/tree_selection	success	Not a local patch, async

diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c index f21cfbbc3638..8126f5c0160f 100644 --- a/tools/testing/selftests/landlock/net_test.c +++ b/tools/testing/selftests/landlock/net_test.c @@ -2,7 +2,7 @@ /* * Landlock tests - Network * - * Copyright © 2022-2023 Huawei Tech. Co., Ltd. + * Copyright © 2022-2024 Huawei Tech. Co., Ltd. * Copyright © 2023 Microsoft Corporation */ @@ -22,6 +22,17 @@ #include "common.h" +/* clang-format off */ + +#define ACCESS_LAST LANDLOCK_ACCESS_NET_LISTEN_TCP + +#define ACCESS_ALL ( \ + LANDLOCK_ACCESS_NET_BIND_TCP | \ + LANDLOCK_ACCESS_NET_CONNECT_TCP | \ + LANDLOCK_ACCESS_NET_LISTEN_TCP) + +/* clang-format on */ + const short sock_port_start = (1 << 10); static const char loopback_ipv4[] = "127.0.0.1"; @@ -282,6 +293,16 @@ static int connect_variant(const int sock_fd, return connect_variant_addrlen(sock_fd, srv, get_addrlen(srv, false)); } +static int listen_variant(const int sock_fd, const int backlog) +{ + int ret; + + ret = listen(sock_fd, backlog); + if (ret < 0) + return -errno; + return ret; +} + FIXTURE(protocol) { struct service_fixture srv0, srv1, srv2, unspec_any0, unspec_srv0; @@ -438,9 +459,11 @@ FIXTURE_VARIANT_ADD(protocol, tcp_sandbox_with_unix_datagram) { }, }; -static void test_bind_and_connect(struct __test_metadata *const _metadata, - const struct service_fixture *const srv, - const bool deny_bind, const bool deny_connect) +static void test_restricted_net_fixture(struct __test_metadata *const _metadata, + const struct service_fixture *const srv, + const bool deny_bind, + const bool deny_connect, + const bool deny_listen) { char buf = '\0'; int inval_fd, bind_fd, client_fd, status, ret; @@ -512,8 +535,14 @@ static void test_bind_and_connect(struct __test_metadata *const _metadata, EXPECT_EQ(0, ret); /* Creates a listening socket. */ - if (srv->protocol.type == SOCK_STREAM) - EXPECT_EQ(0, listen(bind_fd, backlog)); + if (srv->protocol.type == SOCK_STREAM) { + ret = listen_variant(bind_fd, backlog); + if (deny_listen) { + EXPECT_EQ(-EACCES, ret); + } else { + EXPECT_EQ(0, ret); + } + } } child = fork(); @@ -530,7 +559,7 @@ static void test_bind_and_connect(struct __test_metadata *const _metadata, ret = connect_variant(connect_fd, srv); if (deny_connect) { EXPECT_EQ(-EACCES, ret); - } else if (deny_bind) { + } else if (deny_bind || deny_listen) { /* No listening server. */ EXPECT_EQ(-ECONNREFUSED, ret); } else { @@ -545,7 +574,7 @@ static void test_bind_and_connect(struct __test_metadata *const _metadata, /* Accepts connection from the child. */ client_fd = bind_fd; - if (!deny_bind && !deny_connect) { + if (!deny_bind && !deny_connect && !deny_listen) { if (srv->protocol.type == SOCK_STREAM) { client_fd = accept(bind_fd, NULL, 0); ASSERT_LE(0, client_fd); @@ -571,16 +600,15 @@ TEST_F(protocol, bind) { if (variant->sandbox == TCP_SANDBOX) { const struct landlock_ruleset_attr ruleset_attr = { - .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | - LANDLOCK_ACCESS_NET_CONNECT_TCP, + .handled_access_net = ACCESS_ALL, }; - const struct landlock_net_port_attr tcp_bind_connect_p0 = { - .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | - LANDLOCK_ACCESS_NET_CONNECT_TCP, + const struct landlock_net_port_attr tcp_not_restricted_p0 = { + .allowed_access = ACCESS_ALL, .port = self->srv0.port, }; - const struct landlock_net_port_attr tcp_connect_p1 = { - .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP, + const struct landlock_net_port_attr tcp_denied_bind_p1 = { + .allowed_access = ACCESS_ALL & + ~LANDLOCK_ACCESS_NET_BIND_TCP, .port = self->srv1.port, }; int ruleset_fd; @@ -589,48 +617,47 @@ TEST_F(protocol, bind) sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); - /* Allows connect and bind for the first port. */ + /* Allows all actions for the first port. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, - &tcp_bind_connect_p0, 0)); + &tcp_not_restricted_p0, 0)); - /* Allows connect and denies bind for the second port. */ + /* Allows all actions despite bind. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, - &tcp_connect_p1, 0)); + &tcp_denied_bind_p1, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } + bool restricted = is_restricted(&variant->prot, variant->sandbox); /* Binds a socket to the first port. */ - test_bind_and_connect(_metadata, &self->srv0, false, false); + test_restricted_net_fixture(_metadata, &self->srv0, false, false, + false); /* Binds a socket to the second port. */ - test_bind_and_connect(_metadata, &self->srv1, - is_restricted(&variant->prot, variant->sandbox), - false); + test_restricted_net_fixture(_metadata, &self->srv1, restricted, false, + false); /* Binds a socket to the third port. */ - test_bind_and_connect(_metadata, &self->srv2, - is_restricted(&variant->prot, variant->sandbox), - is_restricted(&variant->prot, variant->sandbox)); + test_restricted_net_fixture(_metadata, &self->srv2, restricted, + restricted, restricted); } TEST_F(protocol, connect) { if (variant->sandbox == TCP_SANDBOX) { const struct landlock_ruleset_attr ruleset_attr = { - .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | - LANDLOCK_ACCESS_NET_CONNECT_TCP, + .handled_access_net = ACCESS_ALL, }; - const struct landlock_net_port_attr tcp_bind_connect_p0 = { - .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | - LANDLOCK_ACCESS_NET_CONNECT_TCP, + const struct landlock_net_port_attr tcp_not_restricted_p0 = { + .allowed_access = ACCESS_ALL, .port = self->srv0.port, }; - const struct landlock_net_port_attr tcp_bind_p1 = { - .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, + const struct landlock_net_port_attr tcp_denied_connect_p1 = { + .allowed_access = ACCESS_ALL & + ~LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = self->srv1.port, }; int ruleset_fd; @@ -639,28 +666,27 @@ TEST_F(protocol, connect) sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); - /* Allows connect and bind for the first port. */ + /* Allows all actions for the first port. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, - &tcp_bind_connect_p0, 0)); + &tcp_not_restricted_p0, 0)); - /* Allows bind and denies connect for the second port. */ + /* Allows all actions despite connect. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, - &tcp_bind_p1, 0)); + &tcp_denied_connect_p1, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } - - test_bind_and_connect(_metadata, &self->srv0, false, false); - - test_bind_and_connect(_metadata, &self->srv1, false, - is_restricted(&variant->prot, variant->sandbox)); - - test_bind_and_connect(_metadata, &self->srv2, - is_restricted(&variant->prot, variant->sandbox), - is_restricted(&variant->prot, variant->sandbox)); + bool restricted = is_restricted(&variant->prot, variant->sandbox); + + test_restricted_net_fixture(_metadata, &self->srv0, false, false, + false); + test_restricted_net_fixture(_metadata, &self->srv1, false, restricted, + false); + test_restricted_net_fixture(_metadata, &self->srv2, restricted, + restricted, restricted); } TEST_F(protocol, bind_unspec) @@ -761,7 +787,7 @@ TEST_F(protocol, connect_unspec) ASSERT_LE(0, bind_fd); EXPECT_EQ(0, bind_variant(bind_fd, &self->srv0)); if (self->srv0.protocol.type == SOCK_STREAM) - EXPECT_EQ(0, listen(bind_fd, backlog)); + EXPECT_EQ(0, listen_variant(bind_fd, backlog)); child = fork(); ASSERT_LE(0, child); @@ -1127,8 +1153,8 @@ TEST_F(tcp_layers, ruleset_overlap) * Forbids to connect to the socket because only one ruleset layer * allows connect. */ - test_bind_and_connect(_metadata, &self->srv0, false, - variant->num_layers >= 2); + test_restricted_net_fixture(_metadata, &self->srv0, false, + variant->num_layers >= 2, false); } TEST_F(tcp_layers, ruleset_expand) @@ -1208,11 +1234,12 @@ TEST_F(tcp_layers, ruleset_expand) EXPECT_EQ(0, close(ruleset_fd)); } - test_bind_and_connect(_metadata, &self->srv0, false, - variant->num_layers >= 3); + test_restricted_net_fixture(_metadata, &self->srv0, false, + variant->num_layers >= 3, false); - test_bind_and_connect(_metadata, &self->srv1, variant->num_layers >= 1, - variant->num_layers >= 2); + test_restricted_net_fixture(_metadata, &self->srv1, + variant->num_layers >= 1, + variant->num_layers >= 2, false); } /* clang-format off */ @@ -1230,16 +1257,6 @@ FIXTURE_TEARDOWN(mini) { } -/* 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(mini, network_access_rights) { const struct landlock_ruleset_attr ruleset_attr = { @@ -1454,8 +1471,9 @@ TEST_F(mini, tcp_port_overflow) enforce_ruleset(_metadata, ruleset_fd); - test_bind_and_connect(_metadata, &srv_denied, true, true); - test_bind_and_connect(_metadata, &srv_max_allowed, false, false); + test_restricted_net_fixture(_metadata, &srv_denied, true, true, false); + test_restricted_net_fixture(_metadata, &srv_max_allowed, false, false, + false); } FIXTURE(ipv4_tcp) @@ -1485,22 +1503,21 @@ FIXTURE_TEARDOWN(ipv4_tcp) TEST_F(ipv4_tcp, port_endianness) { const struct landlock_ruleset_attr ruleset_attr = { - .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | - LANDLOCK_ACCESS_NET_CONNECT_TCP, + .handled_access_net = ACCESS_ALL, }; const struct landlock_net_port_attr bind_host_endian_p0 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, /* Host port format. */ .port = self->srv0.port, }; - const struct landlock_net_port_attr connect_big_endian_p0 = { - .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP, + const struct landlock_net_port_attr connect_listen_big_endian_p0 = { + .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP | + LANDLOCK_ACCESS_NET_LISTEN_TCP, /* Big endian port format. */ .port = htons(self->srv0.port), }; - const struct landlock_net_port_attr bind_connect_host_endian_p1 = { - .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | - LANDLOCK_ACCESS_NET_CONNECT_TCP, + const struct landlock_net_port_attr not_restricted_host_endian_p1 = { + .allowed_access = ACCESS_ALL, /* Host port format. */ .port = self->srv1.port, }; @@ -1514,16 +1531,18 @@ TEST_F(ipv4_tcp, port_endianness) ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &bind_host_endian_p0, 0)); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, - &connect_big_endian_p0, 0)); + &connect_listen_big_endian_p0, 0)); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, - &bind_connect_host_endian_p1, 0)); + &not_restricted_host_endian_p1, 0)); enforce_ruleset(_metadata, ruleset_fd); /* No restriction for big endinan CPU. */ - test_bind_and_connect(_metadata, &self->srv0, false, little_endian); + test_restricted_net_fixture(_metadata, &self->srv0, false, + little_endian, little_endian); /* No restriction for any CPU. */ - test_bind_and_connect(_metadata, &self->srv1, false, false); + test_restricted_net_fixture(_metadata, &self->srv1, false, false, + false); } TEST_F(ipv4_tcp, with_fs) @@ -1691,7 +1710,7 @@ TEST_F(port_specific, bind_connect_zero) ret = bind_variant(bind_fd, &self->srv0); EXPECT_EQ(0, ret); - EXPECT_EQ(0, listen(bind_fd, backlog)); + EXPECT_EQ(0, listen_variant(bind_fd, backlog)); /* Connects on port 0. */ ret = connect_variant(connect_fd, &self->srv0); @@ -1714,26 +1733,23 @@ TEST_F(port_specific, bind_connect_zero) EXPECT_EQ(0, close(bind_fd)); } -TEST_F(port_specific, bind_connect_1023) +TEST_F(port_specific, port_1023) { int bind_fd, connect_fd, ret; - /* Adds a rule layer with bind and connect actions. */ + /* Adds a rule layer with all actions. */ if (variant->sandbox == TCP_SANDBOX) { const struct landlock_ruleset_attr ruleset_attr = { - .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | - LANDLOCK_ACCESS_NET_CONNECT_TCP + .handled_access_net = ACCESS_ALL }; /* A rule with port value less than 1024. */ - const struct landlock_net_port_attr tcp_bind_connect_low_range = { - .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | - LANDLOCK_ACCESS_NET_CONNECT_TCP, + const struct landlock_net_port_attr tcp_low_range_port = { + .allowed_access = ACCESS_ALL, .port = 1023, }; /* A rule with 1024 port. */ - const struct landlock_net_port_attr tcp_bind_connect = { - .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | - LANDLOCK_ACCESS_NET_CONNECT_TCP, + const struct landlock_net_port_attr tcp_port_1024 = { + .allowed_access = ACCESS_ALL, .port = 1024, }; int ruleset_fd; @@ -1744,10 +1760,10 @@ TEST_F(port_specific, bind_connect_1023) ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, - &tcp_bind_connect_low_range, 0)); + &tcp_low_range_port, 0)); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, - &tcp_bind_connect, 0)); + &tcp_port_1024, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); @@ -1771,7 +1787,7 @@ TEST_F(port_specific, bind_connect_1023) ret = bind_variant(bind_fd, &self->srv0); clear_cap(_metadata, CAP_NET_BIND_SERVICE); EXPECT_EQ(0, ret); - EXPECT_EQ(0, listen(bind_fd, backlog)); + EXPECT_EQ(0, listen_variant(bind_fd, backlog)); /* Connects on the binded port 1023. */ ret = connect_variant(connect_fd, &self->srv0); @@ -1791,7 +1807,7 @@ TEST_F(port_specific, bind_connect_1023) /* Binds on port 1024. */ ret = bind_variant(bind_fd, &self->srv0); EXPECT_EQ(0, ret); - EXPECT_EQ(0, listen(bind_fd, backlog)); + EXPECT_EQ(0, listen_variant(bind_fd, backlog)); /* Connects on the binded port 1024. */ ret = connect_variant(connect_fd, &self->srv0);

[RFC,v1,3/9] selftests/landlock: Support LANDLOCK_ACCESS_NET_LISTEN_TCP

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