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Date: Fri, 1 Apr 2022 18:52:53 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Cc: willemdebruijn.kernel@...il.com,
linux-security-module@...r.kernel.org, netdev@...r.kernel.org,
netfilter-devel@...r.kernel.org, yusongping@...wei.com,
artem.kuzin@...wei.com, anton.sirazetdinov@...wei.com
Subject: Re: [RFC PATCH v4 10/15] seltest/landlock: add tests for bind() hooks
You need to update tools/testing/selftests/landlock/config to enable
CONFIG_NET and CONFIG_INET.
On 09/03/2022 14:44, Konstantin Meskhidze wrote:
> Adds two selftests for bind socket action.
> The one is with no landlock restrictions:
> - bind_no_restrictions;
> The second one is with mixed landlock rules:
> - bind_with_restrictions;
Some typos (that propagated to all selftest patches):
selftest/landlock: Add tests for bind hook
Add two tests for bind socket actions:
- bind_no_restrictions
- bind_with_restrictions
>
> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
> ---
>
> Changes since v3:
> * Split commit.
> * Add helper create_socket.
> * Add FIXTURE_SETUP.
>
> ---
> .../testing/selftests/landlock/network_test.c | 153 ++++++++++++++++++
> 1 file changed, 153 insertions(+)
> create mode 100644 tools/testing/selftests/landlock/network_test.c
>
> diff --git a/tools/testing/selftests/landlock/network_test.c b/tools/testing/selftests/landlock/network_test.c
> new file mode 100644
> index 000000000000..4c60f6d973a8
> --- /dev/null
> +++ b/tools/testing/selftests/landlock/network_test.c
For consistency, please rename to net_test.c
> @@ -0,0 +1,153 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Landlock tests - Network
> + *
> + * Copyright (C) 2022 Huawei Tech. Co., Ltd.
> + * Author: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
> + *
> + */
> +
> +#define _GNU_SOURCE
> +#include <arpa/inet.h>
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <linux/landlock.h>
> +#include <netinet/in.h>
> +#include <string.h>
> +#include <sys/prctl.h>
> +#include <sys/socket.h>
> +#include <sys/types.h>
> +
> +#include "common.h"
> +
> +#define MAX_SOCKET_NUM 10
> +
> +#define SOCK_PORT_START 3470
> +#define SOCK_PORT_ADD 10
> +
> +#define IP_ADDRESS "127.0.0.1"
> +
> +uint port[MAX_SOCKET_NUM];
> +struct sockaddr_in addr[MAX_SOCKET_NUM];
> +
> +const int one = 1;
> +
> +/* Number pending connections queue to be hold */
> +#define BACKLOG 10
> +
> +static int create_socket(struct __test_metadata *const _metadata)
> +{
> +
> + int sockfd;
> +
> + sockfd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
> + ASSERT_LE(0, sockfd);
> + /* Allows to reuse of local address */
> + ASSERT_EQ(0, setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)));
Why is it required?
> +
> + return sockfd;
> +}
> +
> +static void enforce_ruleset(struct __test_metadata *const _metadata,
> + const int ruleset_fd)
> +{
> + ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
> + ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0)) {
> + TH_LOG("Failed to enforce ruleset: %s", strerror(errno));
> + }
> +}
> +
> +FIXTURE(socket) { };
You should pick another more meaningful name.
> +
> +FIXTURE_SETUP(socket)
> +{
> + int i;
> + /* Creates socket addresses */
> + for (i = 0; i < MAX_SOCKET_NUM; i++) {
> + port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
> + addr[i].sin_family = AF_INET;
> + addr[i].sin_port = htons(port[i]);
> + addr[i].sin_addr.s_addr = inet_addr(IP_ADDRESS);
> + memset(&(addr[i].sin_zero), '\0', 8);
> + }
This is the right place to set up network namespace. It will make tests
non-flaky.
> +}
> +
> +FIXTURE_TEARDOWN(socket)
> +{ }
> +
> +TEST_F_FORK(socket, bind_no_restrictions) {
> +
> + int sockfd;
> +
> + sockfd = create_socket(_metadata);
> + ASSERT_LE(0, sockfd);
> +
> + /* Binds a socket to port[0] */
> + ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&addr[0], sizeof(addr[0])));
> +
> + ASSERT_EQ(0, close(sockfd));
> +}
> +
> +TEST_F_FORK(socket, bind_with_restrictions) {
> +
> + int sockfd_1, sockfd_2, sockfd_3;
Do you really need to have 3 opened socket at the same time?
> +
> + struct landlock_ruleset_attr ruleset_attr = {
> + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP |
> + LANDLOCK_ACCESS_NET_CONNECT_TCP,
> + };
> + struct landlock_net_service_attr net_service_1 = {
> + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP |
> + LANDLOCK_ACCESS_NET_CONNECT_TCP,
> + .port = port[0],
> + };
> + struct landlock_net_service_attr net_service_2 = {
> + .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
> + .port = port[1],
> + };
> + struct landlock_net_service_attr net_service_3 = {
> + .allowed_access = 0,
> + .port = port[2],
> + };
> +
> + const int ruleset_fd = landlock_create_ruleset(&ruleset_attr,
> + sizeof(ruleset_attr), 0);
> + ASSERT_LE(0, ruleset_fd);
> +
> + /* Allows connect and bind operations to the port[0] socket. */
> + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
> + &net_service_1, 0));
> + /* Allows connect and deny bind operations to the port[1] socket. */
> + ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
> + &net_service_2, 0));
> + /* Empty allowed_access (i.e. deny rules) are ignored in network actions
> + * for port[2] socket.
> + */
> + ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
> + &net_service_3, 0));
> + ASSERT_EQ(ENOMSG, errno);
> +
> + /* Enforces the ruleset. */
> + enforce_ruleset(_metadata, ruleset_fd);
> +
> + sockfd_1 = create_socket(_metadata);
> + ASSERT_LE(0, sockfd_1);
> + /* Binds a socket to port[0] */
> + ASSERT_EQ(0, bind(sockfd_1, (struct sockaddr *)&addr[0], sizeof(addr[0])));
> +
> + /* Close bounded socket*/
> + ASSERT_EQ(0, close(sockfd_1));
> +
> + sockfd_2 = create_socket(_metadata);
> + ASSERT_LE(0, sockfd_2);
> + /* Binds a socket to port[1] */
> + ASSERT_EQ(-1, bind(sockfd_2, (struct sockaddr *)&addr[1], sizeof(addr[1])));
> + ASSERT_EQ(EACCES, errno);
> +
> + sockfd_3 = create_socket(_metadata);
> + ASSERT_LE(0, sockfd_3);
> + /* Binds a socket to port[2] */
> + ASSERT_EQ(-1, bind(sockfd_3, (struct sockaddr *)&addr[2], sizeof(addr[2])));
> + ASSERT_EQ(EACCES, errno);
> +}
> +TEST_HARNESS_MAIN
> --
> 2.25.1
>
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