--- /dev/null
+// 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 <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/landlock.h>
+#include <linux/in.h>
+#include <sched.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#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, unknown_access_rights)
+{
+ __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, 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
projects / thirdparty / linux.git / commitdiff
