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Date: Mon, 16 May 2022 23:20:34 +0800
From: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
To: <mic@...ikod.net>
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: [PATCH v5 11/15] seltests/landlock: connect() with AF_UNSPEC tests
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);
+
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,
@@ -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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