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

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Date:   Tue, 6 Sep 2022 10:09:41 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Cc:     willemdebruijn.kernel@...il.com, gnoack3000@...il.com,
        linux-security-module@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, yusongping@...wei.com,
        hukeping@...wei.com, anton.sirazetdinov@...wei.com
Subject: Re: [PATCH v7 14/18] seltests/landlock: add rules overlapping test


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)