netdev - Re: [PATCH v7 14/18] seltests/landlock: add rules overlapping test

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Date:   Sat, 10 Sep 2022 23:49:22 +0300
From:   "Konstantin Meskhidze (A)" <konstantin.meskhidze@...wei.com>
To:     Mickaël Salaün <mic@...ikod.net>
CC:     <willemdebruijn.kernel@...il.com>, <gnoack3000@...il.com>,
        <linux-security-module@...r.kernel.org>, <netdev@...r.kernel.org>,
        <netfilter-devel@...r.kernel.org>, <anton.sirazetdinov@...wei.com>
Subject: Re: [PATCH v7 14/18] seltests/landlock: add rules overlapping test



9/6/2022 11:09 AM, Mickaël Salaün пишет:
> 
> On 29/08/2022 19:03, Konstantin Meskhidze wrote:
>> 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 v6:
>> * None.
>> 
>> Changes since v5:
>> * Formats code with clang-format-14.
>> 
>> Changes since v4:
>> * Refactors code with self->port, self->addr4 variables.
>> 
>> Changes since v3:
>> * Adds ruleset_overlap test.
>> 
>> ---
>>   tools/testing/selftests/landlock/net_test.c | 89 +++++++++++++++++++++
>>   1 file changed, 89 insertions(+)
>> 
>> diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c
>> index 40aef7c683af..b3b38745f4eb 100644
>> --- a/tools/testing/selftests/landlock/net_test.c
>> +++ b/tools/testing/selftests/landlock/net_test.c
>> @@ -464,4 +464,93 @@ TEST_F(socket, connect_afunspec_with_restictions)
>>   	ASSERT_EQ(1, WIFEXITED(status));
>>   	ASSERT_EQ(EXIT_SUCCESS, WEXITSTATUS(status));
>>   }
>> +
>> +TEST_F(socket, ruleset_overlap)
>> +{
>> +	int sockfd;
>> +	int one = 1;
>> +
>> +	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 = self->port[0],
>> +	};
>> +
>> +	struct landlock_net_service_attr net_service_2 = {
>> +		.allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP |
>> +				  LANDLOCK_ACCESS_NET_CONNECT_TCP,
>> +
>> +		.port = self->port[0],
>> +	};
>> +
>> +	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_variant(variant, SOCK_STREAM);
>> +	ASSERT_LE(0, sockfd);
>> +	/* Allows to reuse of local address. */
>> +	ASSERT_EQ(0, setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &one,
>> +				sizeof(one)));
>> +
>> +	/* Binds the socket to address with port[0]. */
>> +	ASSERT_EQ(0, bind_variant(variant, sockfd, self, 0));
>> +
>> +	/* Makes connection to socket with port[0]. */
>> +	ASSERT_EQ(0, connect_variant(variant, sockfd, self, 0));
>> +
>> +	/* Closes socket. */
>> +	ASSERT_EQ(0, close(sockfd));
>> +
>> +	/* Creates another ruleset layer. */
>> +	ruleset_fd =
>> +		landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
>> +	ASSERT_LE(0, ruleset_fd);
>> +
>> +	/*
>> +	 * Allows bind operations to the port[0] socket in
>> +	 * the new ruleset layer.
>> +	 */
>> +	ASSERT_EQ(0, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
>> +				       &net_service_1, 0));
>> +
>> +	/* Enforces the new ruleset. */
>> +	enforce_ruleset(_metadata, ruleset_fd);
>> +
>> +	/* Creates a server socket. */
>> +	sockfd = create_socket_variant(variant, SOCK_STREAM);
>> +	ASSERT_LE(0, sockfd);
>> +	/* Allows to reuse of local address. */
>> +	ASSERT_EQ(0, setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &one,
>> +				sizeof(one)));
>> +
>> +	/* Binds the socket to address with port[0]. */
>> +	ASSERT_EQ(0, bind_variant(variant, sockfd, self, 0));
>> +
>> +	/*
>> +	 * Forbids to connect the socket to address with port[0],
>> +	 * cause just one ruleset layer has connect() access rule.
> 
> s/cause/because/ (everywhere)

   Ok. I will rewrite it.
> .