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Date: Tue, 17 May 2022 10:55:20 +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,
anton.sirazetdinov@...wei.com
Subject: Re: [PATCH v5 11/15] seltests/landlock: connect() with AF_UNSPEC
tests
I guess these tests would also work with IPv6. You can then use the
"alternative" tests I explained.
On 16/05/2022 17:20, Konstantin Meskhidze wrote:
> Adds two selftests for connect() action with
> AF_UNSPEC family flag.
> The one is with no landlock restrictions
> allows to disconnect already conneted socket
> with connect(..., AF_UNSPEC, ...):
> - connect_afunspec_no_restictions;
> The second one refuses landlocked process
> to disconnect already connected socket:
> - connect_afunspec_with_restictions;
>
> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
> ---
>
> Changes since v3:
> * Add connect_afunspec_no_restictions test.
> * Add connect_afunspec_with_restictions test.
>
> Changes since v4:
> * Refactoring code with self->port, self->addr4 variables.
> * Adds bind() hook check for with AF_UNSPEC family.
>
> ---
> tools/testing/selftests/landlock/net_test.c | 121 ++++++++++++++++++++
> 1 file changed, 121 insertions(+)
>
> diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c
> index cf914d311eb3..bf8e49466d1d 100644
> --- a/tools/testing/selftests/landlock/net_test.c
> +++ b/tools/testing/selftests/landlock/net_test.c
> @@ -449,6 +449,7 @@ TEST_F_FORK(socket_test, connect_with_restrictions_ip6) {
> int new_fd;
> int sockfd_1, sockfd_2;
> pid_t child_1, child_2;
> +
> int status;
>
> struct landlock_ruleset_attr ruleset_attr = {
> @@ -467,10 +468,12 @@ TEST_F_FORK(socket_test, connect_with_restrictions_ip6) {
>
> const int ruleset_fd = landlock_create_ruleset(&ruleset_attr,
> sizeof(ruleset_attr), 0);
> +
Please no…
> 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,
> +
ditto
> &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,
> @@ -480,6 +483,7 @@ TEST_F_FORK(socket_test, connect_with_restrictions_ip6) {
> enforce_ruleset(_metadata, ruleset_fd);
>
> /* Creates a server socket 1 */
> +
> sockfd_1 = create_socket(_metadata, true, false);
> ASSERT_LE(0, sockfd_1);
>
> @@ -556,4 +560,121 @@ TEST_F_FORK(socket_test, connect_with_restrictions_ip6) {
> ASSERT_EQ(1, WIFEXITED(status));
> ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status));
> }
> +
> +TEST_F_FORK(socket_test, connect_afunspec_no_restictions) {
> +
> + int sockfd;
> + pid_t child;
> + int status;
> +
> + /* Creates a server socket 1 */
> + sockfd = create_socket(_metadata, false, false);
> + ASSERT_LE(0, sockfd);
> +
> + /* Binds the socket 1 to address with port[0] with AF_UNSPEC family */
> + self->addr4[0].sin_family = AF_UNSPEC;
> + ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr4[0], sizeof(self->addr4[0])));
> +
> + /* Makes connection to socket with port[0] */
> + ASSERT_EQ(0, connect(sockfd, (struct sockaddr *)&self->addr4[0],
> + sizeof(self->addr4[0])));
> +
> + child = fork();
> + ASSERT_LE(0, child);
> + if (child == 0) {
> + struct sockaddr addr_unspec = {.sa_family = AF_UNSPEC};
> +
> + /* Child tries to disconnect already connected socket */
> + ASSERT_EQ(0, connect(sockfd, (struct sockaddr *)&addr_unspec,
> + sizeof(addr_unspec)));
> + _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE);
> + return;
> + }
> + /* Closes listening socket 1 for the parent*/
> + ASSERT_EQ(0, close(sockfd));
> +
> + ASSERT_EQ(child, waitpid(child, &status, 0));
> + ASSERT_EQ(1, WIFEXITED(status));
> + ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status));
> +}
> +
> +TEST_F_FORK(socket_test, connect_afunspec_with_restictions) {
> +
> + int sockfd;
> + pid_t child;
> + int status;
> +
> + struct landlock_ruleset_attr ruleset_attr_1 = {
> + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP,
> + };
> + struct landlock_net_service_attr net_service_1 = {
> + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP,
> +
> + .port = self->port[0],
> + };
> +
> + struct landlock_ruleset_attr ruleset_attr_2 = {
> + .handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP |
> + LANDLOCK_ACCESS_NET_CONNECT_TCP,
> + };
> + struct landlock_net_service_attr net_service_2 = {
> + .allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP |
> + LANDLOCK_ACCESS_NET_CONNECT_TCP,
> +
> + .port = self->port[0],
> + };
> +
> + const int ruleset_fd_1 = landlock_create_ruleset(&ruleset_attr_1,
> + sizeof(ruleset_attr_1), 0);
> + ASSERT_LE(0, ruleset_fd_1);
> +
> + /* Allows bind operations to the port[0] socket */
> + ASSERT_EQ(0, landlock_add_rule(ruleset_fd_1, LANDLOCK_RULE_NET_SERVICE,
> + &net_service_1, 0));
> +
> + /* Enforces the ruleset. */
> + enforce_ruleset(_metadata, ruleset_fd_1);
> +
> + /* Creates a server socket 1 */
> + sockfd = create_socket(_metadata, false, false);
> + ASSERT_LE(0, sockfd);
> +
> + /* Binds the socket 1 to address with port[0] with AF_UNSPEC family */
> + self->addr4[0].sin_family = AF_UNSPEC;
> + ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr4[0], sizeof(self->addr4[0])));
> +
> + /* Makes connection to socket with port[0] */
> + ASSERT_EQ(0, connect(sockfd, (struct sockaddr *)&self->addr4[0],
> + sizeof(self->addr4[0])));
> +
> + const int ruleset_fd_2 = landlock_create_ruleset(&ruleset_attr_2,
> + sizeof(ruleset_attr_2), 0);
> + ASSERT_LE(0, ruleset_fd_2);
> +
> + /* Allows connect and bind operations to the port[0] socket */
> + ASSERT_EQ(0, landlock_add_rule(ruleset_fd_2, LANDLOCK_RULE_NET_SERVICE,
> + &net_service_2, 0));
> +
> + /* Enforces the ruleset. */
> + enforce_ruleset(_metadata, ruleset_fd_2);
> +
> + child = fork();
> + ASSERT_LE(0, child);
> + if (child == 0) {
> + struct sockaddr addr_unspec = {.sa_family = AF_UNSPEC};
> +
> + /* Child tries to disconnect already connected socket */
> + ASSERT_EQ(-1, connect(sockfd, (struct sockaddr *)&addr_unspec,
> + sizeof(addr_unspec)));
> + ASSERT_EQ(EACCES, errno);
> + _exit(_metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE);
> + return;
> + }
> + /* Closes listening socket 1 for the parent*/
> + ASSERT_EQ(0, close(sockfd));
> +
> + ASSERT_EQ(child, waitpid(child, &status, 0));
> + ASSERT_EQ(1, WIFEXITED(status));
> + ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status));
> +}
> TEST_HARNESS_MAIN
> --
> 2.25.1
>
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