diff mbox series

[RFC,v1,6/7] selftests/landlock: Adapt existing tests for UDP

Message ID 20240916122230.114800-7-matthieu@buffet.re (mailing list archive)
State Handled Elsewhere
Headers show
Series landlock: Add UDP access control support | expand

Commit Message

Matthieu Buffet Sept. 16, 2024, 12:22 p.m. UTC 
Make basic changes to the existing bind()/connect() test suite to also
encompass testing UDP access control.

Signed-off-by: Matthieu Buffet <matthieu@buffet.re>
---
 tools/testing/selftests/landlock/base_test.c |   2 +-
 tools/testing/selftests/landlock/net_test.c  | 145 ++++++++++++++-----
 2 files changed, 111 insertions(+), 36 deletions(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/landlock/base_test.c b/tools/testing/selftests/landlock/base_test.c
index 3b26bf3cf5b9..1bc16fde2e8a 100644
--- a/tools/testing/selftests/landlock/base_test.c
+++ b/tools/testing/selftests/landlock/base_test.c
@@ -76,7 +76,7 @@  TEST(abi_version)
 	const struct landlock_ruleset_attr ruleset_attr = {
 		.handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE,
 	};
-	ASSERT_EQ(5, landlock_create_ruleset(NULL, 0,
+	ASSERT_EQ(6, landlock_create_ruleset(NULL, 0,
 					     LANDLOCK_CREATE_RULESET_VERSION));
 
 	ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, 0,
diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c
index f21cfbbc3638..883e6648e79a 100644
--- a/tools/testing/selftests/landlock/net_test.c
+++ b/tools/testing/selftests/landlock/net_test.c
@@ -34,6 +34,7 @@  enum sandbox_type {
 	NO_SANDBOX,
 	/* This may be used to test rules that allow *and* deny accesses. */
 	TCP_SANDBOX,
+	UDP_SANDBOX,
 };
 
 struct protocol_variant {
@@ -123,6 +124,8 @@  static bool is_restricted(const struct protocol_variant *const prot,
 		switch (prot->type) {
 		case SOCK_STREAM:
 			return sandbox == TCP_SANDBOX;
+		case SOCK_DGRAM:
+			return sandbox == UDP_SANDBOX;
 		}
 		break;
 	}
@@ -438,6 +441,46 @@  FIXTURE_VARIANT_ADD(protocol, tcp_sandbox_with_unix_datagram) {
 	},
 };
 
+/* clang-format off */
+FIXTURE_VARIANT_ADD(protocol, udp_sandbox_with_ipv4_udp) {
+	/* clang-format on */
+	.sandbox = UDP_SANDBOX,
+	.prot = {
+		.domain = AF_INET,
+		.type = SOCK_DGRAM,
+	},
+};
+
+/* clang-format off */
+FIXTURE_VARIANT_ADD(protocol, udp_sandbox_with_ipv4_tcp) {
+	/* clang-format on */
+	.sandbox = UDP_SANDBOX,
+	.prot = {
+		.domain = AF_INET,
+		.type = SOCK_STREAM,
+	},
+};
+
+/* clang-format off */
+FIXTURE_VARIANT_ADD(protocol, udp_sandbox_with_ipv6_udp) {
+	/* clang-format on */
+	.sandbox = UDP_SANDBOX,
+	.prot = {
+		.domain = AF_INET6,
+		.type = SOCK_DGRAM,
+	},
+};
+
+/* clang-format off */
+FIXTURE_VARIANT_ADD(protocol, udp_sandbox_with_ipv6_tcp) {
+	/* clang-format on */
+	.sandbox = UDP_SANDBOX,
+	.prot = {
+		.domain = AF_INET6,
+		.type = SOCK_STREAM,
+	},
+};
+
 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)
@@ -530,7 +573,7 @@  static void test_bind_and_connect(struct __test_metadata *const _metadata,
 		ret = connect_variant(connect_fd, srv);
 		if (deny_connect) {
 			EXPECT_EQ(-EACCES, ret);
-		} else if (deny_bind) {
+		} else if (deny_bind && srv->protocol.type == SOCK_STREAM) {
 			/* No listening server. */
 			EXPECT_EQ(-ECONNREFUSED, ret);
 		} else {
@@ -569,18 +612,32 @@  static void test_bind_and_connect(struct __test_metadata *const _metadata,
 
 TEST_F(protocol, bind)
 {
-	if (variant->sandbox == TCP_SANDBOX) {
+	if (variant->sandbox != NO_SANDBOX) {
+		__u64 bind_access = (variant->sandbox == UDP_SANDBOX ?
+			LANDLOCK_ACCESS_NET_BIND_UDP :
+			LANDLOCK_ACCESS_NET_BIND_TCP);
+		__u64 connect_access = (variant->sandbox == UDP_SANDBOX ?
+			LANDLOCK_ACCESS_NET_CONNECT_UDP :
+			LANDLOCK_ACCESS_NET_CONNECT_TCP);
+		/*
+		 * Rights required to send/recv in addition to bind/connect,
+		 * just to confirm that bind/connect indeed worked.
+		 */
+		if (variant->sandbox == UDP_SANDBOX) {
+			bind_access |= LANDLOCK_ACCESS_NET_RECVMSG_UDP |
+				LANDLOCK_ACCESS_NET_SENDMSG_UDP;
+			connect_access |= LANDLOCK_ACCESS_NET_RECVMSG_UDP |
+				LANDLOCK_ACCESS_NET_SENDMSG_UDP;
+		}
 		const struct landlock_ruleset_attr ruleset_attr = {
-			.handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP |
-					      LANDLOCK_ACCESS_NET_CONNECT_TCP,
+			.handled_access_net = bind_access | connect_access,
 		};
-		const struct landlock_net_port_attr tcp_bind_connect_p0 = {
-			.allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP |
-					  LANDLOCK_ACCESS_NET_CONNECT_TCP,
+		const struct landlock_net_port_attr bind_connect_p0 = {
+			.allowed_access = bind_access | connect_access,
 			.port = self->srv0.port,
 		};
-		const struct landlock_net_port_attr tcp_connect_p1 = {
-			.allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
+		const struct landlock_net_port_attr connect_p1 = {
+			.allowed_access = connect_access,
 			.port = self->srv1.port,
 		};
 		int ruleset_fd;
@@ -589,15 +646,15 @@  TEST_F(protocol, bind)
 						     sizeof(ruleset_attr), 0);
 		ASSERT_LE(0, ruleset_fd);
 
-		/* Allows connect and bind for the first port.  */
+		/* Allows client and server behaviours for the first port */
 		ASSERT_EQ(0,
 			  landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT,
-					    &tcp_bind_connect_p0, 0));
+					    &bind_connect_p0, 0));
 
-		/* Allows connect and denies bind for the second port. */
+		/* Allows client and deny server behaviour for the second one */
 		ASSERT_EQ(0,
 			  landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT,
-					    &tcp_connect_p1, 0));
+					    &connect_p1, 0));
 
 		enforce_ruleset(_metadata, ruleset_fd);
 		EXPECT_EQ(0, close(ruleset_fd));
@@ -619,18 +676,22 @@  TEST_F(protocol, bind)
 
 TEST_F(protocol, connect)
 {
-	if (variant->sandbox == TCP_SANDBOX) {
+	if (variant->sandbox != NO_SANDBOX) {
+		__u64 bind_access = (variant->sandbox == UDP_SANDBOX ?
+			LANDLOCK_ACCESS_NET_BIND_UDP :
+			LANDLOCK_ACCESS_NET_BIND_TCP);
+		__u64 connect_access = (variant->sandbox == UDP_SANDBOX ?
+			LANDLOCK_ACCESS_NET_CONNECT_UDP :
+			LANDLOCK_ACCESS_NET_CONNECT_TCP);
 		const struct landlock_ruleset_attr ruleset_attr = {
-			.handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP |
-					      LANDLOCK_ACCESS_NET_CONNECT_TCP,
+			.handled_access_net = bind_access | connect_access,
 		};
-		const struct landlock_net_port_attr tcp_bind_connect_p0 = {
-			.allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP |
-					  LANDLOCK_ACCESS_NET_CONNECT_TCP,
+		const struct landlock_net_port_attr bind_connect_p0 = {
+			.allowed_access = bind_access | connect_access,
 			.port = self->srv0.port,
 		};
-		const struct landlock_net_port_attr tcp_bind_p1 = {
-			.allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP,
+		const struct landlock_net_port_attr bind_p1 = {
+			.allowed_access = bind_access,
 			.port = self->srv1.port,
 		};
 		int ruleset_fd;
@@ -642,12 +703,12 @@  TEST_F(protocol, connect)
 		/* 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));
+					    &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));
+					    &bind_p1, 0));
 
 		enforce_ruleset(_metadata, ruleset_fd);
 		EXPECT_EQ(0, close(ruleset_fd));
@@ -665,16 +726,21 @@  TEST_F(protocol, connect)
 
 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) {
+	if (variant->sandbox != NO_SANDBOX) {
+		const struct landlock_ruleset_attr ruleset_attr = {
+			.handled_access_net = (variant->sandbox == TCP_SANDBOX ?
+				LANDLOCK_ACCESS_NET_BIND_TCP :
+				LANDLOCK_ACCESS_NET_BIND_UDP),
+		};
+		const struct landlock_net_port_attr bind = {
+			.allowed_access = (variant->sandbox == TCP_SANDBOX ?
+				LANDLOCK_ACCESS_NET_BIND_TCP :
+				LANDLOCK_ACCESS_NET_BIND_UDP),
+			.port = self->srv0.port,
+		};
+
 		const int ruleset_fd = landlock_create_ruleset(
 			&ruleset_attr, sizeof(ruleset_attr), 0);
 		ASSERT_LE(0, ruleset_fd);
@@ -682,7 +748,7 @@  TEST_F(protocol, bind_unspec)
 		/* Allows bind. */
 		ASSERT_EQ(0,
 			  landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT,
-					    &tcp_bind, 0));
+					    &bind, 0));
 		enforce_ruleset(_metadata, ruleset_fd);
 		EXPECT_EQ(0, close(ruleset_fd));
 	}
@@ -703,7 +769,12 @@  TEST_F(protocol, bind_unspec)
 	}
 	EXPECT_EQ(0, close(bind_fd));
 
-	if (variant->sandbox == TCP_SANDBOX) {
+	if (variant->sandbox != NO_SANDBOX) {
+		const struct landlock_ruleset_attr ruleset_attr = {
+			.handled_access_net = (variant->sandbox == TCP_SANDBOX ?
+				LANDLOCK_ACCESS_NET_BIND_TCP :
+				LANDLOCK_ACCESS_NET_BIND_UDP),
+		};
 		const int ruleset_fd = landlock_create_ruleset(
 			&ruleset_attr, sizeof(ruleset_attr), 0);
 		ASSERT_LE(0, ruleset_fd);
@@ -1232,11 +1303,15 @@  FIXTURE_TEARDOWN(mini)
 
 /* clang-format off */
 
-#define ACCESS_LAST LANDLOCK_ACCESS_NET_CONNECT_TCP
+#define ACCESS_LAST LANDLOCK_ACCESS_NET_SENDMSG_UDP
 
 #define ACCESS_ALL ( \
 	LANDLOCK_ACCESS_NET_BIND_TCP | \
-	LANDLOCK_ACCESS_NET_CONNECT_TCP)
+	LANDLOCK_ACCESS_NET_CONNECT_TCP | \
+	LANDLOCK_ACCESS_NET_BIND_UDP | \
+	LANDLOCK_ACCESS_NET_CONNECT_UDP | \
+	LANDLOCK_ACCESS_NET_RECVMSG_UDP | \
+	LANDLOCK_ACCESS_NET_SENDMSG_UDP)
 
 /* clang-format on */