// SPDX-License-Identifier: GPL-2.0-only /* * Landlock tests - Network * * Copyright © 2022-2023 Huawei Tech. Co., Ltd. * Copyright © 2023 Microsoft Corporation */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include "common.h" const short sock_port_start = (1 << 10); static const char loopback_ipv4[] = "127.0.0.1"; static const char loopback_ipv6[] = "::1"; /* Number pending connections queue to be hold. */ const short backlog = 10; enum sandbox_type { NO_SANDBOX, /* This may be used to test rules that allow *and* deny accesses. */ TCP_SANDBOX, }; struct protocol_variant { int domain; int type; }; struct service_fixture { struct protocol_variant protocol; /* port is also stored in ipv4_addr.sin_port or ipv6_addr.sin6_port */ unsigned short port; union { struct sockaddr_in ipv4_addr; struct sockaddr_in6 ipv6_addr; struct { struct sockaddr_un unix_addr; socklen_t unix_addr_len; }; }; }; static int set_service(struct service_fixture *const srv, const struct protocol_variant prot, const unsigned short index) { memset(srv, 0, sizeof(*srv)); /* * Copies all protocol properties in case of the variant only contains * a subset of them. */ srv->protocol = prot; /* Checks for port overflow. */ if (index > 2) return 1; srv->port = sock_port_start << (2 * index); switch (prot.domain) { case AF_UNSPEC: case AF_INET: srv->ipv4_addr.sin_family = prot.domain; srv->ipv4_addr.sin_port = htons(srv->port); srv->ipv4_addr.sin_addr.s_addr = inet_addr(loopback_ipv4); return 0; case AF_INET6: srv->ipv6_addr.sin6_family = prot.domain; srv->ipv6_addr.sin6_port = htons(srv->port); inet_pton(AF_INET6, loopback_ipv6, &srv->ipv6_addr.sin6_addr); return 0; case AF_UNIX: srv->unix_addr.sun_family = prot.domain; sprintf(srv->unix_addr.sun_path, "_selftests-landlock-net-tid%d-index%d", gettid(), index); srv->unix_addr_len = SUN_LEN(&srv->unix_addr); srv->unix_addr.sun_path[0] = '\0'; return 0; } return 1; } static void setup_loopback(struct __test_metadata *const _metadata) { 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); } static bool is_restricted(const struct protocol_variant *const prot, const enum sandbox_type sandbox) { switch (prot->domain) { case AF_INET: case AF_INET6: switch (prot->type) { case SOCK_STREAM: return sandbox == TCP_SANDBOX; } break; } return false; } static int socket_variant(const struct service_fixture *const srv) { int ret; ret = socket(srv->protocol.domain, srv->protocol.type | SOCK_CLOEXEC, 0); if (ret < 0) return -errno; return ret; } #ifndef SIN6_LEN_RFC2133 #define SIN6_LEN_RFC2133 24 #endif static socklen_t get_addrlen(const struct service_fixture *const srv, const bool minimal) { switch (srv->protocol.domain) { case AF_UNSPEC: case AF_INET: return sizeof(srv->ipv4_addr); case AF_INET6: if (minimal) return SIN6_LEN_RFC2133; return sizeof(srv->ipv6_addr); case AF_UNIX: if (minimal) return sizeof(srv->unix_addr) - sizeof(srv->unix_addr.sun_path); return srv->unix_addr_len; default: return 0; } } static void set_port(struct service_fixture *const srv, uint16_t port) { switch (srv->protocol.domain) { case AF_UNSPEC: case AF_INET: srv->ipv4_addr.sin_port = htons(port); return; case AF_INET6: srv->ipv6_addr.sin6_port = htons(port); return; default: return; } } static uint16_t get_binded_port(int socket_fd, const struct protocol_variant *const prot) { struct sockaddr_in ipv4_addr; struct sockaddr_in6 ipv6_addr; socklen_t ipv4_addr_len, ipv6_addr_len; /* Gets binded port. */ switch (prot->domain) { case AF_UNSPEC: case AF_INET: ipv4_addr_len = sizeof(ipv4_addr); getsockname(socket_fd, &ipv4_addr, &ipv4_addr_len); return ntohs(ipv4_addr.sin_port); case AF_INET6: ipv6_addr_len = sizeof(ipv6_addr); getsockname(socket_fd, &ipv6_addr, &ipv6_addr_len); return ntohs(ipv6_addr.sin6_port); default: return 0; } } static int bind_variant_addrlen(const int sock_fd, const struct service_fixture *const srv, const socklen_t addrlen) { int ret; switch (srv->protocol.domain) { case AF_UNSPEC: case AF_INET: ret = bind(sock_fd, &srv->ipv4_addr, addrlen); break; case AF_INET6: ret = bind(sock_fd, &srv->ipv6_addr, addrlen); break; case AF_UNIX: ret = bind(sock_fd, &srv->unix_addr, addrlen); break; default: errno = EAFNOSUPPORT; return -errno; } if (ret < 0) return -errno; return ret; } static int bind_variant(const int sock_fd, const struct service_fixture *const srv) { return bind_variant_addrlen(sock_fd, srv, get_addrlen(srv, false)); } static int connect_variant_addrlen(const int sock_fd, const struct service_fixture *const srv, const socklen_t addrlen) { int ret; switch (srv->protocol.domain) { case AF_UNSPEC: case AF_INET: ret = connect(sock_fd, &srv->ipv4_addr, addrlen); break; case AF_INET6: ret = connect(sock_fd, &srv->ipv6_addr, addrlen); break; case AF_UNIX: ret = connect(sock_fd, &srv->unix_addr, addrlen); break; default: errno = -EAFNOSUPPORT; return -errno; } if (ret < 0) return -errno; return ret; } static int connect_variant(const int sock_fd, const struct service_fixture *const srv) { return connect_variant_addrlen(sock_fd, srv, get_addrlen(srv, false)); } FIXTURE(protocol) { struct service_fixture srv0, srv1, srv2, unspec_any0, unspec_srv0; }; FIXTURE_VARIANT(protocol) { const enum sandbox_type sandbox; const struct protocol_variant prot; }; FIXTURE_SETUP(protocol) { const struct protocol_variant prot_unspec = { .domain = AF_UNSPEC, .type = SOCK_STREAM, }; disable_caps(_metadata); ASSERT_EQ(0, set_service(&self->srv0, variant->prot, 0)); ASSERT_EQ(0, set_service(&self->srv1, variant->prot, 1)); ASSERT_EQ(0, set_service(&self->srv2, variant->prot, 2)); ASSERT_EQ(0, set_service(&self->unspec_srv0, prot_unspec, 0)); ASSERT_EQ(0, set_service(&self->unspec_any0, prot_unspec, 0)); self->unspec_any0.ipv4_addr.sin_addr.s_addr = htonl(INADDR_ANY); setup_loopback(_metadata); }; FIXTURE_TEARDOWN(protocol) { } /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, no_sandbox_with_ipv4_tcp) { /* clang-format on */ .sandbox = NO_SANDBOX, .prot = { .domain = AF_INET, .type = SOCK_STREAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, no_sandbox_with_ipv6_tcp) { /* clang-format on */ .sandbox = NO_SANDBOX, .prot = { .domain = AF_INET6, .type = SOCK_STREAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, no_sandbox_with_ipv4_udp) { /* clang-format on */ .sandbox = NO_SANDBOX, .prot = { .domain = AF_INET, .type = SOCK_DGRAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, no_sandbox_with_ipv6_udp) { /* clang-format on */ .sandbox = NO_SANDBOX, .prot = { .domain = AF_INET6, .type = SOCK_DGRAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, no_sandbox_with_unix_stream) { /* clang-format on */ .sandbox = NO_SANDBOX, .prot = { .domain = AF_UNIX, .type = SOCK_STREAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, no_sandbox_with_unix_datagram) { /* clang-format on */ .sandbox = NO_SANDBOX, .prot = { .domain = AF_UNIX, .type = SOCK_DGRAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, tcp_sandbox_with_ipv4_tcp) { /* clang-format on */ .sandbox = TCP_SANDBOX, .prot = { .domain = AF_INET, .type = SOCK_STREAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, tcp_sandbox_with_ipv6_tcp) { /* clang-format on */ .sandbox = TCP_SANDBOX, .prot = { .domain = AF_INET6, .type = SOCK_STREAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, tcp_sandbox_with_ipv4_udp) { /* clang-format on */ .sandbox = TCP_SANDBOX, .prot = { .domain = AF_INET, .type = SOCK_DGRAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, tcp_sandbox_with_ipv6_udp) { /* clang-format on */ .sandbox = TCP_SANDBOX, .prot = { .domain = AF_INET6, .type = SOCK_DGRAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, tcp_sandbox_with_unix_stream) { /* clang-format on */ .sandbox = TCP_SANDBOX, .prot = { .domain = AF_UNIX, .type = SOCK_STREAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(protocol, tcp_sandbox_with_unix_datagram) { /* clang-format on */ .sandbox = TCP_SANDBOX, .prot = { .domain = AF_UNIX, .type = SOCK_DGRAM, }, }; 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) { char buf = '\0'; int inval_fd, bind_fd, client_fd, status, ret; pid_t child; /* Starts invalid addrlen tests with bind. */ inval_fd = socket_variant(srv); ASSERT_LE(0, inval_fd) { TH_LOG("Failed to create socket: %s", strerror(errno)); } /* Tries to bind with zero as addrlen. */ EXPECT_EQ(-EINVAL, bind_variant_addrlen(inval_fd, srv, 0)); /* Tries to bind with too small addrlen. */ EXPECT_EQ(-EINVAL, bind_variant_addrlen(inval_fd, srv, get_addrlen(srv, true) - 1)); /* Tries to bind with minimal addrlen. */ ret = bind_variant_addrlen(inval_fd, srv, get_addrlen(srv, true)); if (deny_bind) { EXPECT_EQ(-EACCES, ret); } else { EXPECT_EQ(0, ret) { TH_LOG("Failed to bind to socket: %s", strerror(errno)); } } EXPECT_EQ(0, close(inval_fd)); /* Starts invalid addrlen tests with connect. */ inval_fd = socket_variant(srv); ASSERT_LE(0, inval_fd); /* Tries to connect with zero as addrlen. */ EXPECT_EQ(-EINVAL, connect_variant_addrlen(inval_fd, srv, 0)); /* Tries to connect with too small addrlen. */ EXPECT_EQ(-EINVAL, connect_variant_addrlen(inval_fd, srv, get_addrlen(srv, true) - 1)); /* Tries to connect with minimal addrlen. */ ret = connect_variant_addrlen(inval_fd, srv, get_addrlen(srv, true)); if (srv->protocol.domain == AF_UNIX) { EXPECT_EQ(-EINVAL, ret); } else if (deny_connect) { EXPECT_EQ(-EACCES, ret); } else if (srv->protocol.type == SOCK_STREAM) { /* No listening server, whatever the value of deny_bind. */ EXPECT_EQ(-ECONNREFUSED, ret); } else { EXPECT_EQ(0, ret) { TH_LOG("Failed to connect to socket: %s", strerror(errno)); } } EXPECT_EQ(0, close(inval_fd)); /* Starts connection tests. */ bind_fd = socket_variant(srv); ASSERT_LE(0, bind_fd); ret = bind_variant(bind_fd, srv); if (deny_bind) { EXPECT_EQ(-EACCES, ret); } else { EXPECT_EQ(0, ret); /* Creates a listening socket. */ if (srv->protocol.type == SOCK_STREAM) EXPECT_EQ(0, listen(bind_fd, backlog)); } child = fork(); ASSERT_LE(0, child); if (child == 0) { int connect_fd, ret; /* Closes listening socket for the child. */ EXPECT_EQ(0, close(bind_fd)); /* Starts connection tests. */ connect_fd = socket_variant(srv); ASSERT_LE(0, connect_fd); ret = connect_variant(connect_fd, srv); if (deny_connect) { EXPECT_EQ(-EACCES, ret); } else if (deny_bind) { /* No listening server. */ EXPECT_EQ(-ECONNREFUSED, ret); } else { EXPECT_EQ(0, ret); EXPECT_EQ(1, write(connect_fd, ".", 1)); } EXPECT_EQ(0, close(connect_fd)); _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); return; } /* Accepts connection from the child. */ client_fd = bind_fd; if (!deny_bind && !deny_connect) { if (srv->protocol.type == SOCK_STREAM) { client_fd = accept(bind_fd, NULL, 0); ASSERT_LE(0, client_fd); } EXPECT_EQ(1, read(client_fd, &buf, 1)); EXPECT_EQ('.', buf); } EXPECT_EQ(child, waitpid(child, &status, 0)); EXPECT_EQ(1, WIFEXITED(status)); EXPECT_EQ(EXIT_SUCCESS, WEXITSTATUS(status)); /* Closes connection, if any. */ if (client_fd != bind_fd) EXPECT_LE(0, close(client_fd)); /* Closes listening socket. */ EXPECT_EQ(0, close(bind_fd)); } 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, }; const struct landlock_net_port_attr tcp_bind_connect_p0 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = self->srv0.port, }; const struct landlock_net_port_attr tcp_connect_p1 = { .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = self->srv1.port, }; int ruleset_fd; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Allows connect and bind for the first port. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_connect_p0, 0)); /* Allows connect and denies bind for the second port. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_connect_p1, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } /* Binds a socket to the first port. */ test_bind_and_connect(_metadata, &self->srv0, false, false); /* Binds a socket to the second port. */ test_bind_and_connect(_metadata, &self->srv1, is_restricted(&variant->prot, variant->sandbox), 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_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, }; const struct landlock_net_port_attr tcp_bind_connect_p0 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = self->srv0.port, }; const struct landlock_net_port_attr tcp_bind_p1 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = self->srv1.port, }; int ruleset_fd; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Allows connect and bind for the first port. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_connect_p0, 0)); /* Allows bind and denies connect for the second port. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_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)); } TEST_F(protocol, bind_unspec) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP, }; const struct landlock_net_port_attr tcp_bind = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = self->srv0.port, }; int bind_fd, ret; if (variant->sandbox == TCP_SANDBOX) { const int ruleset_fd = landlock_create_ruleset( &ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Allows bind. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } bind_fd = socket_variant(&self->srv0); ASSERT_LE(0, bind_fd); /* Allowed bind on AF_UNSPEC/INADDR_ANY. */ ret = bind_variant(bind_fd, &self->unspec_any0); if (variant->prot.domain == AF_INET) { EXPECT_EQ(0, ret) { TH_LOG("Failed to bind to unspec/any socket: %s", strerror(errno)); } } else { EXPECT_EQ(-EINVAL, ret); } EXPECT_EQ(0, close(bind_fd)); if (variant->sandbox == TCP_SANDBOX) { const int ruleset_fd = landlock_create_ruleset( &ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Denies bind. */ enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } bind_fd = socket_variant(&self->srv0); ASSERT_LE(0, bind_fd); /* Denied bind on AF_UNSPEC/INADDR_ANY. */ ret = bind_variant(bind_fd, &self->unspec_any0); if (variant->prot.domain == AF_INET) { if (is_restricted(&variant->prot, variant->sandbox)) { EXPECT_EQ(-EACCES, ret); } else { EXPECT_EQ(0, ret); } } else { EXPECT_EQ(-EINVAL, ret); } EXPECT_EQ(0, close(bind_fd)); /* Checks bind with AF_UNSPEC and the loopback address. */ bind_fd = socket_variant(&self->srv0); ASSERT_LE(0, bind_fd); ret = bind_variant(bind_fd, &self->unspec_srv0); if (variant->prot.domain == AF_INET) { EXPECT_EQ(-EAFNOSUPPORT, ret); } else { EXPECT_EQ(-EINVAL, ret) { TH_LOG("Wrong bind error: %s", strerror(errno)); } } EXPECT_EQ(0, close(bind_fd)); } TEST_F(protocol, connect_unspec) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = LANDLOCK_ACCESS_NET_CONNECT_TCP, }; const struct landlock_net_port_attr tcp_connect = { .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = self->srv0.port, }; int bind_fd, client_fd, status; pid_t child; /* Specific connection tests. */ bind_fd = socket_variant(&self->srv0); 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)); child = fork(); ASSERT_LE(0, child); if (child == 0) { int connect_fd, ret; /* Closes listening socket for the child. */ EXPECT_EQ(0, close(bind_fd)); connect_fd = socket_variant(&self->srv0); ASSERT_LE(0, connect_fd); EXPECT_EQ(0, connect_variant(connect_fd, &self->srv0)); /* Tries to connect again, or set peer. */ ret = connect_variant(connect_fd, &self->srv0); if (self->srv0.protocol.type == SOCK_STREAM) { EXPECT_EQ(-EISCONN, ret); } else { EXPECT_EQ(0, ret); } if (variant->sandbox == TCP_SANDBOX) { const int ruleset_fd = landlock_create_ruleset( &ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Allows connect. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_connect, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } /* Disconnects already connected socket, or set peer. */ ret = connect_variant(connect_fd, &self->unspec_any0); if (self->srv0.protocol.domain == AF_UNIX && self->srv0.protocol.type == SOCK_STREAM) { EXPECT_EQ(-EINVAL, ret); } else { EXPECT_EQ(0, ret); } /* Tries to reconnect, or set peer. */ ret = connect_variant(connect_fd, &self->srv0); if (self->srv0.protocol.domain == AF_UNIX && self->srv0.protocol.type == SOCK_STREAM) { EXPECT_EQ(-EISCONN, ret); } else { EXPECT_EQ(0, ret); } if (variant->sandbox == TCP_SANDBOX) { const int ruleset_fd = landlock_create_ruleset( &ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Denies connect. */ enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } ret = connect_variant(connect_fd, &self->unspec_any0); if (self->srv0.protocol.domain == AF_UNIX && self->srv0.protocol.type == SOCK_STREAM) { EXPECT_EQ(-EINVAL, ret); } else { /* Always allowed to disconnect. */ EXPECT_EQ(0, ret); } EXPECT_EQ(0, close(connect_fd)); _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); return; } client_fd = bind_fd; if (self->srv0.protocol.type == SOCK_STREAM) { client_fd = accept(bind_fd, NULL, 0); ASSERT_LE(0, client_fd); } EXPECT_EQ(child, waitpid(child, &status, 0)); EXPECT_EQ(1, WIFEXITED(status)); EXPECT_EQ(EXIT_SUCCESS, WEXITSTATUS(status)); /* Closes connection, if any. */ if (client_fd != bind_fd) EXPECT_LE(0, close(client_fd)); /* Closes listening socket. */ EXPECT_EQ(0, close(bind_fd)); } FIXTURE(ipv4) { struct service_fixture srv0, srv1; }; FIXTURE_VARIANT(ipv4) { const enum sandbox_type sandbox; const int type; }; /* clang-format off */ FIXTURE_VARIANT_ADD(ipv4, no_sandbox_with_tcp) { /* clang-format on */ .sandbox = NO_SANDBOX, .type = SOCK_STREAM, }; /* clang-format off */ FIXTURE_VARIANT_ADD(ipv4, tcp_sandbox_with_tcp) { /* clang-format on */ .sandbox = TCP_SANDBOX, .type = SOCK_STREAM, }; /* clang-format off */ FIXTURE_VARIANT_ADD(ipv4, no_sandbox_with_udp) { /* clang-format on */ .sandbox = NO_SANDBOX, .type = SOCK_DGRAM, }; /* clang-format off */ FIXTURE_VARIANT_ADD(ipv4, tcp_sandbox_with_udp) { /* clang-format on */ .sandbox = TCP_SANDBOX, .type = SOCK_DGRAM, }; FIXTURE_SETUP(ipv4) { const struct protocol_variant prot = { .domain = AF_INET, .type = variant->type, }; disable_caps(_metadata); set_service(&self->srv0, prot, 0); set_service(&self->srv1, prot, 1); setup_loopback(_metadata); }; FIXTURE_TEARDOWN(ipv4) { } TEST_F(ipv4, from_unix_to_inet) { int unix_stream_fd, unix_dgram_fd; 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, }; const struct landlock_net_port_attr tcp_bind_connect_p0 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = self->srv0.port, }; int ruleset_fd; /* Denies connect and bind to check errno value. */ ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Allows connect and bind for srv0. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_connect_p0, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } unix_stream_fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0); ASSERT_LE(0, unix_stream_fd); unix_dgram_fd = socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0); ASSERT_LE(0, unix_dgram_fd); /* Checks unix stream bind and connect for srv0. */ EXPECT_EQ(-EINVAL, bind_variant(unix_stream_fd, &self->srv0)); EXPECT_EQ(-EINVAL, connect_variant(unix_stream_fd, &self->srv0)); /* Checks unix stream bind and connect for srv1. */ EXPECT_EQ(-EINVAL, bind_variant(unix_stream_fd, &self->srv1)) { TH_LOG("Wrong bind error: %s", strerror(errno)); } EXPECT_EQ(-EINVAL, connect_variant(unix_stream_fd, &self->srv1)); /* Checks unix datagram bind and connect for srv0. */ EXPECT_EQ(-EINVAL, bind_variant(unix_dgram_fd, &self->srv0)); EXPECT_EQ(-EINVAL, connect_variant(unix_dgram_fd, &self->srv0)); /* Checks unix datagram bind and connect for srv1. */ EXPECT_EQ(-EINVAL, bind_variant(unix_dgram_fd, &self->srv1)); EXPECT_EQ(-EINVAL, connect_variant(unix_dgram_fd, &self->srv1)); } FIXTURE(tcp_layers) { struct service_fixture srv0, srv1; }; FIXTURE_VARIANT(tcp_layers) { const size_t num_layers; const int domain; }; FIXTURE_SETUP(tcp_layers) { const struct protocol_variant prot = { .domain = variant->domain, .type = SOCK_STREAM, }; disable_caps(_metadata); ASSERT_EQ(0, set_service(&self->srv0, prot, 0)); ASSERT_EQ(0, set_service(&self->srv1, prot, 1)); setup_loopback(_metadata); }; FIXTURE_TEARDOWN(tcp_layers) { } /* clang-format off */ FIXTURE_VARIANT_ADD(tcp_layers, no_sandbox_with_ipv4) { /* clang-format on */ .domain = AF_INET, .num_layers = 0, }; /* clang-format off */ FIXTURE_VARIANT_ADD(tcp_layers, one_sandbox_with_ipv4) { /* clang-format on */ .domain = AF_INET, .num_layers = 1, }; /* clang-format off */ FIXTURE_VARIANT_ADD(tcp_layers, two_sandboxes_with_ipv4) { /* clang-format on */ .domain = AF_INET, .num_layers = 2, }; /* clang-format off */ FIXTURE_VARIANT_ADD(tcp_layers, three_sandboxes_with_ipv4) { /* clang-format on */ .domain = AF_INET, .num_layers = 3, }; /* clang-format off */ FIXTURE_VARIANT_ADD(tcp_layers, no_sandbox_with_ipv6) { /* clang-format on */ .domain = AF_INET6, .num_layers = 0, }; /* clang-format off */ FIXTURE_VARIANT_ADD(tcp_layers, one_sandbox_with_ipv6) { /* clang-format on */ .domain = AF_INET6, .num_layers = 1, }; /* clang-format off */ FIXTURE_VARIANT_ADD(tcp_layers, two_sandboxes_with_ipv6) { /* clang-format on */ .domain = AF_INET6, .num_layers = 2, }; /* clang-format off */ FIXTURE_VARIANT_ADD(tcp_layers, three_sandboxes_with_ipv6) { /* clang-format on */ .domain = AF_INET6, .num_layers = 3, }; TEST_F(tcp_layers, ruleset_overlap) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, }; const struct landlock_net_port_attr tcp_bind = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = self->srv0.port, }; const struct landlock_net_port_attr tcp_bind_connect = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = self->srv0.port, }; if (variant->num_layers >= 1) { int ruleset_fd; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Allows bind. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind, 0)); /* Also allows bind, but allows connect too. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_connect, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } if (variant->num_layers >= 2) { int ruleset_fd; /* Creates another ruleset layer. */ ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Only allows bind. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } if (variant->num_layers >= 3) { int ruleset_fd; /* Creates another ruleset layer. */ ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Try to allow bind and connect. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_connect, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } /* * 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_F(tcp_layers, ruleset_expand) { if (variant->num_layers >= 1) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP, }; /* Allows bind for srv0. */ const struct landlock_net_port_attr bind_srv0 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = self->srv0.port, }; int ruleset_fd; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &bind_srv0, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } if (variant->num_layers >= 2) { /* Expands network mask with connect action. */ const struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, }; /* Allows bind for srv0 and connect to srv0. */ const struct landlock_net_port_attr tcp_bind_connect_p0 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = self->srv0.port, }; /* Try to allow bind for srv1. */ const struct landlock_net_port_attr tcp_bind_p1 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = self->srv1.port, }; int ruleset_fd; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_connect_p0, 0)); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_p1, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } if (variant->num_layers >= 3) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, }; /* Allows connect to srv0, without bind rule. */ const struct landlock_net_port_attr tcp_bind_p0 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = self->srv0.port, }; int ruleset_fd; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_p0, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } test_bind_and_connect(_metadata, &self->srv0, false, variant->num_layers >= 3); test_bind_and_connect(_metadata, &self->srv1, variant->num_layers >= 1, variant->num_layers >= 2); } /* clang-format off */ FIXTURE(mini) {}; /* clang-format on */ FIXTURE_SETUP(mini) { disable_caps(_metadata); setup_loopback(_metadata); }; 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 = { .handled_access_net = ACCESS_ALL, }; struct landlock_net_port_attr net_port = { .port = sock_port_start, }; int ruleset_fd; __u64 access; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); for (access = 1; access <= ACCESS_LAST; access <<= 1) { net_port.allowed_access = access; EXPECT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &net_port, 0)) { TH_LOG("Failed to add rule with access 0x%llx: %s", access, strerror(errno)); } } EXPECT_EQ(0, close(ruleset_fd)); } /* Checks invalid attribute, out of landlock network access range. */ TEST_F(mini, ruleset_with_unknown_access) { __u64 access_mask; for (access_mask = 1ULL << 63; access_mask != ACCESS_LAST; access_mask >>= 1) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = access_mask, }; EXPECT_EQ(-1, landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0)); EXPECT_EQ(EINVAL, errno); } } TEST_F(mini, rule_with_unknown_access) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = ACCESS_ALL, }; struct landlock_net_port_attr net_port = { .port = sock_port_start, }; int ruleset_fd; __u64 access; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); for (access = 1ULL << 63; access != ACCESS_LAST; access >>= 1) { net_port.allowed_access = access; EXPECT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &net_port, 0)); EXPECT_EQ(EINVAL, errno); } EXPECT_EQ(0, close(ruleset_fd)); } TEST_F(mini, rule_with_unhandled_access) { struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP, }; struct landlock_net_port_attr net_port = { .port = sock_port_start, }; int ruleset_fd; __u64 access; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); for (access = 1; access > 0; access <<= 1) { int err; net_port.allowed_access = access; err = landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &net_port, 0); if (access == ruleset_attr.handled_access_net) { EXPECT_EQ(0, err); } else { EXPECT_EQ(-1, err); EXPECT_EQ(EINVAL, errno); } } EXPECT_EQ(0, close(ruleset_fd)); } TEST_F(mini, inval) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP }; const struct landlock_net_port_attr tcp_bind_connect = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = sock_port_start, }; const struct landlock_net_port_attr tcp_denied = { .allowed_access = 0, .port = sock_port_start, }; const struct landlock_net_port_attr tcp_bind = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = sock_port_start, }; int ruleset_fd; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Checks unhandled allowed_access. */ EXPECT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_connect, 0)); EXPECT_EQ(EINVAL, errno); /* Checks zero access value. */ EXPECT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_denied, 0)); EXPECT_EQ(ENOMSG, errno); /* Adds with legitimate values. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind, 0)); } TEST_F(mini, tcp_port_overflow) { const struct landlock_ruleset_attr ruleset_attr = { .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, }; const struct landlock_net_port_attr port_max_bind = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = UINT16_MAX, }; const struct landlock_net_port_attr port_max_connect = { .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = UINT16_MAX, }; const struct landlock_net_port_attr port_overflow1 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = UINT16_MAX + 1, }; const struct landlock_net_port_attr port_overflow2 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = UINT16_MAX + 2, }; const struct landlock_net_port_attr port_overflow3 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = UINT32_MAX + 1UL, }; const struct landlock_net_port_attr port_overflow4 = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = UINT32_MAX + 2UL, }; const struct protocol_variant ipv4_tcp = { .domain = AF_INET, .type = SOCK_STREAM, }; struct service_fixture srv_denied, srv_max_allowed; int ruleset_fd; ASSERT_EQ(0, set_service(&srv_denied, ipv4_tcp, 0)); /* Be careful to avoid port inconsistencies. */ srv_max_allowed = srv_denied; srv_max_allowed.port = port_max_bind.port; srv_max_allowed.ipv4_addr.sin_port = htons(port_max_bind.port); ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &port_max_bind, 0)); EXPECT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &port_overflow1, 0)); EXPECT_EQ(EINVAL, errno); EXPECT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &port_overflow2, 0)); EXPECT_EQ(EINVAL, errno); EXPECT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &port_overflow3, 0)); EXPECT_EQ(EINVAL, errno); /* Interleaves with invalid rule additions. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &port_max_connect, 0)); EXPECT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &port_overflow4, 0)); EXPECT_EQ(EINVAL, errno); enforce_ruleset(_metadata, ruleset_fd); test_bind_and_connect(_metadata, &srv_denied, true, true); test_bind_and_connect(_metadata, &srv_max_allowed, false, false); } FIXTURE(ipv4_tcp) { struct service_fixture srv0, srv1; }; FIXTURE_SETUP(ipv4_tcp) { const struct protocol_variant ipv4_tcp = { .domain = AF_INET, .type = SOCK_STREAM, }; disable_caps(_metadata); ASSERT_EQ(0, set_service(&self->srv0, ipv4_tcp, 0)); ASSERT_EQ(0, set_service(&self->srv1, ipv4_tcp, 1)); setup_loopback(_metadata); }; 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, }; 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, /* 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, /* Host port format. */ .port = self->srv1.port, }; const unsigned int one = 1; const char little_endian = *(const char *)&one; int ruleset_fd; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); 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)); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &bind_connect_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); /* No restriction for any CPU. */ test_bind_and_connect(_metadata, &self->srv1, false, false); } TEST_F(ipv4_tcp, with_fs) { const struct landlock_ruleset_attr ruleset_attr_fs_net = { .handled_access_fs = LANDLOCK_ACCESS_FS_READ_DIR, .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP, }; struct landlock_path_beneath_attr path_beneath = { .allowed_access = LANDLOCK_ACCESS_FS_READ_DIR, .parent_fd = -1, }; struct landlock_net_port_attr tcp_bind = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP, .port = self->srv0.port, }; int ruleset_fd, bind_fd, dir_fd; /* Creates ruleset both for filesystem and network access. */ ruleset_fd = landlock_create_ruleset(&ruleset_attr_fs_net, sizeof(ruleset_attr_fs_net), 0); ASSERT_LE(0, ruleset_fd); /* Adds a filesystem rule. */ path_beneath.parent_fd = open("/dev", O_PATH | O_DIRECTORY | O_CLOEXEC); ASSERT_LE(0, path_beneath.parent_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH, &path_beneath, 0)); EXPECT_EQ(0, close(path_beneath.parent_fd)); /* Adds a network rule. */ ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); /* Tests file access. */ dir_fd = open("/dev", O_RDONLY); EXPECT_LE(0, dir_fd); EXPECT_EQ(0, close(dir_fd)); dir_fd = open("/", O_RDONLY); EXPECT_EQ(-1, dir_fd); EXPECT_EQ(EACCES, errno); /* Tests port binding. */ bind_fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0); ASSERT_LE(0, bind_fd); EXPECT_EQ(0, bind_variant(bind_fd, &self->srv0)); EXPECT_EQ(0, close(bind_fd)); bind_fd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0); ASSERT_LE(0, bind_fd); EXPECT_EQ(-EACCES, bind_variant(bind_fd, &self->srv1)); } FIXTURE(port_specific) { struct service_fixture srv0; }; FIXTURE_VARIANT(port_specific) { const enum sandbox_type sandbox; const struct protocol_variant prot; }; /* clang-format off */ FIXTURE_VARIANT_ADD(port_specific, no_sandbox_with_ipv4) { /* clang-format on */ .sandbox = NO_SANDBOX, .prot = { .domain = AF_INET, .type = SOCK_STREAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(port_specific, sandbox_with_ipv4) { /* clang-format on */ .sandbox = TCP_SANDBOX, .prot = { .domain = AF_INET, .type = SOCK_STREAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(port_specific, no_sandbox_with_ipv6) { /* clang-format on */ .sandbox = NO_SANDBOX, .prot = { .domain = AF_INET6, .type = SOCK_STREAM, }, }; /* clang-format off */ FIXTURE_VARIANT_ADD(port_specific, sandbox_with_ipv6) { /* clang-format on */ .sandbox = TCP_SANDBOX, .prot = { .domain = AF_INET6, .type = SOCK_STREAM, }, }; FIXTURE_SETUP(port_specific) { disable_caps(_metadata); ASSERT_EQ(0, set_service(&self->srv0, variant->prot, 0)); setup_loopback(_metadata); }; FIXTURE_TEARDOWN(port_specific) { } TEST_F(port_specific, bind_connect_zero) { int bind_fd, connect_fd, ret; uint16_t port; /* Adds a rule layer with bind and connect 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 }; const struct landlock_net_port_attr tcp_bind_connect_zero = { .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP | LANDLOCK_ACCESS_NET_CONNECT_TCP, .port = 0, }; int ruleset_fd; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); /* Checks zero port value on bind and connect actions. */ EXPECT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_connect_zero, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } bind_fd = socket_variant(&self->srv0); ASSERT_LE(0, bind_fd); connect_fd = socket_variant(&self->srv0); ASSERT_LE(0, connect_fd); /* Sets address port to 0 for both protocol families. */ set_port(&self->srv0, 0); /* * Binds on port 0, which selects a random port within * ip_local_port_range. */ ret = bind_variant(bind_fd, &self->srv0); EXPECT_EQ(0, ret); EXPECT_EQ(0, listen(bind_fd, backlog)); /* Connects on port 0. */ ret = connect_variant(connect_fd, &self->srv0); EXPECT_EQ(-ECONNREFUSED, ret); /* Sets binded port for both protocol families. */ port = get_binded_port(bind_fd, &variant->prot); EXPECT_NE(0, port); set_port(&self->srv0, port); /* Connects on the binded port. */ ret = connect_variant(connect_fd, &self->srv0); if (is_restricted(&variant->prot, variant->sandbox)) { /* Denied by Landlock. */ EXPECT_EQ(-EACCES, ret); } else { EXPECT_EQ(0, ret); } EXPECT_EQ(0, close(connect_fd)); EXPECT_EQ(0, close(bind_fd)); } TEST_F(port_specific, bind_connect_1023) { int bind_fd, connect_fd, ret; /* Adds a rule layer with bind and connect 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 }; /* 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, .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, .port = 1024, }; int ruleset_fd; ruleset_fd = landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0); ASSERT_LE(0, ruleset_fd); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_connect_low_range, 0)); ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT, &tcp_bind_connect, 0)); enforce_ruleset(_metadata, ruleset_fd); EXPECT_EQ(0, close(ruleset_fd)); } bind_fd = socket_variant(&self->srv0); ASSERT_LE(0, bind_fd); connect_fd = socket_variant(&self->srv0); ASSERT_LE(0, connect_fd); /* Sets address port to 1023 for both protocol families. */ set_port(&self->srv0, 1023); /* Binds on port 1023. */ ret = bind_variant(bind_fd, &self->srv0); /* Denied by the system. */ EXPECT_EQ(-EACCES, ret); /* Binds on port 1023. */ set_cap(_metadata, CAP_NET_BIND_SERVICE); 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)); /* Connects on the binded port 1023. */ ret = connect_variant(connect_fd, &self->srv0); EXPECT_EQ(0, ret); EXPECT_EQ(0, close(connect_fd)); EXPECT_EQ(0, close(bind_fd)); bind_fd = socket_variant(&self->srv0); ASSERT_LE(0, bind_fd); connect_fd = socket_variant(&self->srv0); ASSERT_LE(0, connect_fd); /* Sets address port to 1024 for both protocol families. */ set_port(&self->srv0, 1024); /* Binds on port 1024. */ ret = bind_variant(bind_fd, &self->srv0); EXPECT_EQ(0, ret); EXPECT_EQ(0, listen(bind_fd, backlog)); /* Connects on the binded port 1024. */ ret = connect_variant(connect_fd, &self->srv0); EXPECT_EQ(0, ret); EXPECT_EQ(0, close(connect_fd)); EXPECT_EQ(0, close(bind_fd)); } TEST_HARNESS_MAIN