netdev - [RFC PATCH v4 13/15] seltest/landlock: rules overlapping test

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Message-ID: <20220309134459.6448-14-konstantin.meskhidze@huawei.com>
Date:   Wed, 9 Mar 2022 21:44:57 +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>,
        <artem.kuzin@...wei.com>, <anton.sirazetdinov@...wei.com>
Subject: [RFC PATCH v4 13/15] seltest/landlock: rules overlapping test

This patch adds overlapping rules for one port.
First rule adds just bind() access right for a port.
The second one adds both bind() and connect()
access rights for the same port.

Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
---

Changes since v3:
* Add ruleset_overlap test.

---
 .../testing/selftests/landlock/network_test.c | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/tools/testing/selftests/landlock/network_test.c b/tools/testing/selftests/landlock/network_test.c
index 6fce31cad368..e1f219fd9f31 100644
--- a/tools/testing/selftests/landlock/network_test.c
+++ b/tools/testing/selftests/landlock/network_test.c
@@ -406,4 +406,55 @@ TEST_F_FORK(socket, connect_afunspec_with_restictions) {
 	ASSERT_EQ(1, WIFEXITED(status));
 	ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status));
 }
+
+TEST_F_FORK(socket, ruleset_overlap) {
+
+	int sockfd;
+
+	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,
+
+		.port = port[0],
+	};
+
+		struct landlock_net_service_attr net_service_2 = {
+		.allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP |
+				  LANDLOCK_ACCESS_NET_CONNECT_TCP,
+
+		.port = port[0],
+	};
+
+	const int ruleset_fd = landlock_create_ruleset(&ruleset_attr,
+					sizeof(ruleset_attr), 0);
+	ASSERT_LE(0, ruleset_fd);
+
+	/* Allows 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 bind operations to the port[0] socket */
+	ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
+				       &net_service_2, 0));
+
+	/* Enforces the ruleset. */
+	enforce_ruleset(_metadata, ruleset_fd);
+
+	/* Creates a server socket */
+	sockfd = create_socket(_metadata);
+	ASSERT_LE(0, sockfd);
+
+	/* Binds the socket to address with port[0] */
+	ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&addr[0], sizeof(addr[0])));
+
+	/* Makes connection to socket with port[0] */
+	ASSERT_EQ(0, connect(sockfd, (struct sockaddr *)&addr[0],
+						   sizeof(addr[0])));
+
+	/* Closes socket */
+	ASSERT_EQ(0, close(sockfd));
+}
+
 TEST_HARNESS_MAIN
--
2.25.1