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[v5,09/15] seltests/landlock: add tests for bind() hooks

Message ID 20220516152038.39594-10-konstantin.meskhidze@huawei.com (mailing list archive)
State Not Applicable
Headers show
Series Network support for Landlock | expand

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Context Check Description
netdev/tree_selection success Not a local patch, async

Commit Message

Konstantin Meskhidze (A) May 16, 2022, 3:20 p.m. UTC 
Adds selftests for bind socket action.
The first is with no landlock restrictions:
    - bind_no_restrictions_ip4;
    - bind_no_restrictions_ip6;
The second ones is with mixed landlock rules:
    - bind_with_restrictions_ip4;
    - bind_with_restrictions_ip6;

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

Changes since v3:
* Split commit.
* Add helper create_socket.
* Add FIXTURE_SETUP.

Changes since v4:
* Adds port[MAX_SOCKET_NUM], struct sockaddr_in addr4
and struct sockaddr_in addr6 in FIXTURE.
* Refactoring FIXTURE_SETUP:
    - initializing self->port, self->addr4 and self->addr6.
    - adding network namespace.
* Refactoring code with self->port, self->addr4 and
self->addr6 variables.
* Adds selftests for IP6 family:
    - bind_no_restrictions_ip6.
    - bind_with_restrictions_ip6.
* Refactoring selftests/landlock/config
* Moves enforce_ruleset() into common.h

---
 tools/testing/selftests/landlock/common.h   |   9 +
 tools/testing/selftests/landlock/config     |   5 +-
 tools/testing/selftests/landlock/fs_test.c  |  10 -
 tools/testing/selftests/landlock/net_test.c | 237 ++++++++++++++++++++
 4 files changed, 250 insertions(+), 11 deletions(-)
 create mode 100644 tools/testing/selftests/landlock/net_test.c

--
2.25.1

Comments

Mickaël Salaün May 16, 2022, 9:11 p.m. UTC | #1 
On 16/05/2022 17:20, Konstantin Meskhidze wrote:
> Adds selftests for bind socket action.
> The first is with no landlock restrictions:
>      - bind_no_restrictions_ip4;
>      - bind_no_restrictions_ip6;
> The second ones is with mixed landlock rules:
>      - bind_with_restrictions_ip4;
>      - bind_with_restrictions_ip6;
> 
> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
> ---
> 
> Changes since v3:
> * Split commit.
> * Add helper create_socket.
> * Add FIXTURE_SETUP.
> 
> Changes since v4:
> * Adds port[MAX_SOCKET_NUM], struct sockaddr_in addr4
> and struct sockaddr_in addr6 in FIXTURE.
> * Refactoring FIXTURE_SETUP:
>      - initializing self->port, self->addr4 and self->addr6.
>      - adding network namespace.
> * Refactoring code with self->port, self->addr4 and
> self->addr6 variables.
> * Adds selftests for IP6 family:
>      - bind_no_restrictions_ip6.
>      - bind_with_restrictions_ip6.
> * Refactoring selftests/landlock/config
> * Moves enforce_ruleset() into common.h
> 
> ---
>   tools/testing/selftests/landlock/common.h   |   9 +
>   tools/testing/selftests/landlock/config     |   5 +-
>   tools/testing/selftests/landlock/fs_test.c  |  10 -
>   tools/testing/selftests/landlock/net_test.c | 237 ++++++++++++++++++++
>   4 files changed, 250 insertions(+), 11 deletions(-)
>   create mode 100644 tools/testing/selftests/landlock/net_test.c
> 
> diff --git a/tools/testing/selftests/landlock/common.h b/tools/testing/selftests/landlock/common.h
> index 7ba18eb23783..c5381e641dfd 100644
> --- a/tools/testing/selftests/landlock/common.h
> +++ b/tools/testing/selftests/landlock/common.h
> @@ -102,6 +102,15 @@ static inline int landlock_restrict_self(const int ruleset_fd,
>   }
>   #endif
> 
> +static void enforce_ruleset(struct __test_metadata *const _metadata,
> +		const int ruleset_fd)
> +{
> +	ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
> +	ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0)) {
> +		TH_LOG("Failed to enforce ruleset: %s", strerror(errno));
> +	}
> +}
> +

Please create a commit which moves all the needed code for all network 
tests. I think there is only this helper though.


>   static void _init_caps(struct __test_metadata *const _metadata, bool drop_all)
>   {
>   	cap_t cap_p;
> diff --git a/tools/testing/selftests/landlock/config b/tools/testing/selftests/landlock/config
> index 0f0a65287bac..b56f3274d3f5 100644
> --- a/tools/testing/selftests/landlock/config
> +++ b/tools/testing/selftests/landlock/config
> @@ -1,7 +1,10 @@
> +CONFIG_INET=y
> +CONFIG_IPV6=y
> +CONFIG_NET=y
>   CONFIG_OVERLAY_FS=y
>   CONFIG_SECURITY_LANDLOCK=y
>   CONFIG_SECURITY_PATH=y
>   CONFIG_SECURITY=y
>   CONFIG_SHMEM=y
>   CONFIG_TMPFS_XATTR=y
> -CONFIG_TMPFS=y
> +CONFIG_TMPFS=y
> \ No newline at end of file

You add whitespace changes.


> diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
> index 21a2ce8fa739..036dd6f8f9ea 100644
> --- a/tools/testing/selftests/landlock/fs_test.c
> +++ b/tools/testing/selftests/landlock/fs_test.c
> @@ -551,16 +551,6 @@ static int create_ruleset(struct __test_metadata *const _metadata,
>   	return ruleset_fd;
>   }
> 
> -static void enforce_ruleset(struct __test_metadata *const _metadata,
> -			    const int ruleset_fd)
> -{
> -	ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
> -	ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0))
> -	{
> -		TH_LOG("Failed to enforce ruleset: %s", strerror(errno));
> -	}
> -}
> -
>   TEST_F_FORK(layout1, proc_nsfs)
>   {
>   	const struct rule rules[] = {
> diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c
> new file mode 100644
> index 000000000000..478ef2eff559
> --- /dev/null
> +++ b/tools/testing/selftests/landlock/net_test.c
> @@ -0,0 +1,237 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Landlock tests - Network
> + *
> + * Copyright (C) 2022 Huawei Tech. Co., Ltd.
> + */
> +
> +#define _GNU_SOURCE
> +#include <arpa/inet.h>
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <linux/landlock.h>
> +#include <netinet/in.h>
> +#include <sched.h>
> +#include <string.h>
> +#include <sys/prctl.h>
> +#include <sys/socket.h>
> +#include <sys/types.h>
> +
> +#include "common.h"
> +
> +#define MAX_SOCKET_NUM 10
> +
> +#define SOCK_PORT_START 3470
> +#define SOCK_PORT_ADD 10
> +
> +#define IP_ADDRESS "127.0.0.1"
> +
> +/* Number pending connections queue to be hold */
> +#define BACKLOG 10

"Number of pending connection queues to be hold." maybe? This is not use 
in this patch so it shouldn't be added by this patch.


> +
> +static int create_socket(struct __test_metadata *const _metadata,
> +			bool ip6, bool reuse_addr)

This helper is good and I think you can improve it by leveraging test 
variants. You could even factor out all the ipv4/ipv6 tests thanks to 
new helpers such as bind_variant() and connect_variant(). No need to add 
_metadata to those though. This would avoid duplicating all ipv4/ipv6 
tests and even simplifying bind() and connect() calls. Something like this:

// rename "socket_test" to "socket" (no need to duplicate "test")
FIXTURE_VARIANT(socket)
{
	const bool is_ipv4;
};

/* clang-format off */
FIXTURE_VARIANT_ADD(socket, ipv4) {
	/* clang-format on */
	.is_ipv4 = true,
};

/* clang-format off */
FIXTURE_VARIANT_ADD(socket, ipv6) {
	/* clang-format on */
	.is_ipv4 = false,
};

static int socket_variant(const FIXTURE_VARIANT(socket) *const variant, 
const int type)
{
	if (variant->is_ipv4)
		return socket(AF_INET, type | SOCK_CLOEXEC, 0);
	else
		return socket(AF_INET6, type | SOCK_CLOEXEC, 0);
}

socket_variant(variant, SOCK_STREAM);
// this could be used to create UDP sockets too


static int bind_variant(const FIXTURE_VARIANT(socket) *const variant, 
const int sockfd, const FIXTURE_DATA(socket) *const self, const size_t 
index)
{
	if (variant->is_ipv4)
		return bind(sockfd, &self->addr4[index], sizeof(self->addr4[index]));
	else
		return bind(sockfd, &self->addr6[index], sizeof(self->addr6[index]));
}

bind_variant(variant, sockfd, self, 0);


> +{
> +		int sockfd;
> +		int one = 1;
> +
> +		if (ip6)
> +			sockfd = socket(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC, 0);
> +		else
> +			sockfd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
> +
> +		ASSERT_LE(0, sockfd);
> +		/* Allows to reuse of local address */
> +		if (reuse_addr)
> +			ASSERT_EQ(0, setsockopt(sockfd, SOL_SOCKET,
> +					SO_REUSEADDR, &one, sizeof(one)));

This reuse_addr part is not used in this patch and I think it would 
simplify this helper to not add reuse_addr but to explicitely call 
setsockopt() when required. This also enables to get rid of _metadata in 
this helper.


> +		return sockfd;
> +}
> +
> +FIXTURE(socket_test) {
> +	uint port[MAX_SOCKET_NUM];
> +	struct sockaddr_in addr4[MAX_SOCKET_NUM];
> +	struct sockaddr_in6 addr6[MAX_SOCKET_NUM];
> +};
> +
> +FIXTURE_SETUP(socket_test)
> +{
> +	int i;
> +	/* Creates IP4 socket addresses */
> +	for (i = 0; i < MAX_SOCKET_NUM; i++) {

Nice!

> +		self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
> +		self->addr4[i].sin_family = AF_INET;
> +		self->addr4[i].sin_port = htons(self->port[i]);
> +		self->addr4[i].sin_addr.s_addr = htonl(INADDR_ANY);

Could you use the local addr (127.0.0.1) instead?

> +		memset(&(self->addr4[i].sin_zero), '\0', 8);
> +	}
> +
> +	/* Creates IP6 socket addresses */
> +	for (i = 0; i < MAX_SOCKET_NUM; i++) {
> +		self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
> +		self->addr6[i].sin6_family = AF_INET6;
> +		self->addr6[i].sin6_port = htons(self->port[i]);
> +		self->addr6[i].sin6_addr = in6addr_any;

ditto

> +	}
> +
> +	set_cap(_metadata, CAP_SYS_ADMIN);
> +	ASSERT_EQ(0, unshare(CLONE_NEWNET));
> +	ASSERT_EQ(0, system("ip link set dev lo up"));

If this is really required, could you avoid calling system() but set up 
the network in C? You can strace it to see what is going on underneath.


> +	clear_cap(_metadata, CAP_SYS_ADMIN);
> +}
> +
> +FIXTURE_TEARDOWN(socket_test)
> +{ }
> +
> +TEST_F_FORK(socket_test, bind_no_restrictions_ip4) {
> +
> +	int sockfd;
> +
> +	sockfd = create_socket(_metadata, false, false);
> +	ASSERT_LE(0, sockfd);
> +
> +	/* Binds a socket to port[0] */

This comment is not very useful in this context considering the below 
line. It will be even more clear with the bind_variant() call.


> +	ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr4[0], sizeof(self->addr4[0])));
> +
> +	ASSERT_EQ(0, close(sockfd));
> +}
> +
> +TEST_F_FORK(socket_test, bind_no_restrictions_ip6) {
> +
> +	int sockfd;
> +
> +	sockfd = create_socket(_metadata, true, false);
> +	ASSERT_LE(0, sockfd);
> +
> +	/* Binds a socket to port[0] */
> +	ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr6[0], sizeof(self->addr6[0])));
> +
> +	ASSERT_EQ(0, close(sockfd));
> +}
> +
> +TEST_F_FORK(socket_test, bind_with_restrictions_ip4) {
> +
> +	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 |
> +				  LANDLOCK_ACCESS_NET_CONNECT_TCP,
> +		.port = self->port[0],
> +	};
> +	struct landlock_net_service_attr net_service_2 = {
> +		.allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
> +		.port = self->port[1],
> +	};
> +	struct landlock_net_service_attr net_service_3 = {
> +		.allowed_access = 0,
> +		.port = self->port[2],
> +	};
> +
> +	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. */

This comment is useful though because the below call is more complex.


> +	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,
> +				&net_service_2, 0));
> +	/* Empty allowed_access (i.e. deny rules) are ignored in network actions
> +	 * for port[2] socket.
> +	 */
> +	ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
> +				&net_service_3, 0));
> +	ASSERT_EQ(ENOMSG, errno);
> +
> +	/* Enforces the ruleset. */
> +	enforce_ruleset(_metadata, ruleset_fd);
> +
> +	sockfd = create_socket(_metadata, false, false);
> +	ASSERT_LE(0, sockfd);
> +	/* Binds a socket to port[0] */
> +	ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr4[0], sizeof(self->addr4[0])));
> +
> +	/* Close bounded socket*/
> +	ASSERT_EQ(0, close(sockfd));
> +
> +	sockfd = create_socket(_metadata, false, false);
> +	ASSERT_LE(0, sockfd);
> +	/* Binds a socket to port[1] */
> +	ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr4[1], sizeof(self->addr4[1])));
> +	ASSERT_EQ(EACCES, errno);
> +
> +	sockfd = create_socket(_metadata, false, false);
> +	ASSERT_LE(0, sockfd);
> +	/* Binds a socket to port[2] */
> +	ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr4[2], sizeof(self->addr4[2])));
> +	ASSERT_EQ(EACCES, errno);
> +}
> +
> +TEST_F_FORK(socket_test, bind_with_restrictions_ip6) {
> +
> +	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 |
> +				  LANDLOCK_ACCESS_NET_CONNECT_TCP,
> +		.port = self->port[0],
> +	};
> +	struct landlock_net_service_attr net_service_2 = {
> +		.allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
> +		.port = self->port[1],
> +	};
> +	struct landlock_net_service_attr net_service_3 = {
> +		.allowed_access = 0,
> +		.port = self->port[2],
> +	};
> +
> +	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,
> +				&net_service_2, 0));
> +	/* Empty allowed_access (i.e. deny rules) are ignored in network actions
> +	 * for port[2] socket.
> +	 */
> +	ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
> +				&net_service_3, 0));
> +	ASSERT_EQ(ENOMSG, errno);
> +
> +	/* Enforces the ruleset. */
> +	enforce_ruleset(_metadata, ruleset_fd);
> +
> +	sockfd = create_socket(_metadata, true, false);
> +	ASSERT_LE(0, sockfd);
> +	/* Binds a socket to port[0] */
> +	ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr6[0], sizeof(self->addr6[0])));
> +
> +	/* Close bounded socket*/
> +	ASSERT_EQ(0, close(sockfd));
> +
> +	sockfd = create_socket(_metadata, false, false);
> +	ASSERT_LE(0, sockfd);
> +	/* Binds a socket to port[1] */
> +	ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr6[1], sizeof(self->addr6[1])));
> +	ASSERT_EQ(EACCES, errno);
> +
> +	sockfd = create_socket(_metadata, false, false);
> +	ASSERT_LE(0, sockfd);
> +	/* Binds a socket to port[2] */
> +	ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr6[2], sizeof(self->addr6[2])));
> +	ASSERT_EQ(EACCES, errno);
> +}
> +TEST_HARNESS_MAIN
> --
> 2.25.1
>
Konstantin Meskhidze (A) May 19, 2022, 12:10 p.m. UTC | #2 
5/17/2022 12:11 AM, Mickaël Salaün пишет:
> 
> On 16/05/2022 17:20, Konstantin Meskhidze wrote:
>> Adds selftests for bind socket action.
>> The first is with no landlock restrictions:
>>      - bind_no_restrictions_ip4;
>>      - bind_no_restrictions_ip6;
>> The second ones is with mixed landlock rules:
>>      - bind_with_restrictions_ip4;
>>      - bind_with_restrictions_ip6;
>>
>> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
>> ---
>>
>> Changes since v3:
>> * Split commit.
>> * Add helper create_socket.
>> * Add FIXTURE_SETUP.
>>
>> Changes since v4:
>> * Adds port[MAX_SOCKET_NUM], struct sockaddr_in addr4
>> and struct sockaddr_in addr6 in FIXTURE.
>> * Refactoring FIXTURE_SETUP:
>>      - initializing self->port, self->addr4 and self->addr6.
>>      - adding network namespace.
>> * Refactoring code with self->port, self->addr4 and
>> self->addr6 variables.
>> * Adds selftests for IP6 family:
>>      - bind_no_restrictions_ip6.
>>      - bind_with_restrictions_ip6.
>> * Refactoring selftests/landlock/config
>> * Moves enforce_ruleset() into common.h
>>
>> ---
>>   tools/testing/selftests/landlock/common.h   |   9 +
>>   tools/testing/selftests/landlock/config     |   5 +-
>>   tools/testing/selftests/landlock/fs_test.c  |  10 -
>>   tools/testing/selftests/landlock/net_test.c | 237 ++++++++++++++++++++
>>   4 files changed, 250 insertions(+), 11 deletions(-)
>>   create mode 100644 tools/testing/selftests/landlock/net_test.c
>>
>> diff --git a/tools/testing/selftests/landlock/common.h 
>> b/tools/testing/selftests/landlock/common.h
>> index 7ba18eb23783..c5381e641dfd 100644
>> --- a/tools/testing/selftests/landlock/common.h
>> +++ b/tools/testing/selftests/landlock/common.h
>> @@ -102,6 +102,15 @@ static inline int landlock_restrict_self(const 
>> int ruleset_fd,
>>   }
>>   #endif
>>
>> +static void enforce_ruleset(struct __test_metadata *const _metadata,
>> +        const int ruleset_fd)
>> +{
>> +    ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
>> +    ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0)) {
>> +        TH_LOG("Failed to enforce ruleset: %s", strerror(errno));
>> +    }
>> +}
>> +
> 
> Please create a commit which moves all the needed code for all network 
> tests. I think there is only this helper though.

   Ok. I will create one additional commit for moving this helper.
   But after I have moved the helper to common.h, I got warnings while 
compiling seltests where I don't use the one (base_test and ptrace_test)

> 
> 
>>   static void _init_caps(struct __test_metadata *const _metadata, bool 
>> drop_all)
>>   {
>>       cap_t cap_p;
>> diff --git a/tools/testing/selftests/landlock/config 
>> b/tools/testing/selftests/landlock/config
>> index 0f0a65287bac..b56f3274d3f5 100644
>> --- a/tools/testing/selftests/landlock/config
>> +++ b/tools/testing/selftests/landlock/config
>> @@ -1,7 +1,10 @@
>> +CONFIG_INET=y
>> +CONFIG_IPV6=y
>> +CONFIG_NET=y
>>   CONFIG_OVERLAY_FS=y
>>   CONFIG_SECURITY_LANDLOCK=y
>>   CONFIG_SECURITY_PATH=y
>>   CONFIG_SECURITY=y
>>   CONFIG_SHMEM=y
>>   CONFIG_TMPFS_XATTR=y
>> -CONFIG_TMPFS=y
>> +CONFIG_TMPFS=y
>> \ No newline at end of file
> 
> You add whitespace changes.
> 
   OK. I will fix it. Thank you.
> 
>> diff --git a/tools/testing/selftests/landlock/fs_test.c 
>> b/tools/testing/selftests/landlock/fs_test.c
>> index 21a2ce8fa739..036dd6f8f9ea 100644
>> --- a/tools/testing/selftests/landlock/fs_test.c
>> +++ b/tools/testing/selftests/landlock/fs_test.c
>> @@ -551,16 +551,6 @@ static int create_ruleset(struct __test_metadata 
>> *const _metadata,
>>       return ruleset_fd;
>>   }
>>
>> -static void enforce_ruleset(struct __test_metadata *const _metadata,
>> -                const int ruleset_fd)
>> -{
>> -    ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
>> -    ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0))
>> -    {
>> -        TH_LOG("Failed to enforce ruleset: %s", strerror(errno));
>> -    }
>> -}
>> -
>>   TEST_F_FORK(layout1, proc_nsfs)
>>   {
>>       const struct rule rules[] = {
>> diff --git a/tools/testing/selftests/landlock/net_test.c 
>> b/tools/testing/selftests/landlock/net_test.c
>> new file mode 100644
>> index 000000000000..478ef2eff559
>> --- /dev/null
>> +++ b/tools/testing/selftests/landlock/net_test.c
>> @@ -0,0 +1,237 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Landlock tests - Network
>> + *
>> + * Copyright (C) 2022 Huawei Tech. Co., Ltd.
>> + */
>> +
>> +#define _GNU_SOURCE
>> +#include <arpa/inet.h>
>> +#include <errno.h>
>> +#include <fcntl.h>
>> +#include <linux/landlock.h>
>> +#include <netinet/in.h>
>> +#include <sched.h>
>> +#include <string.h>
>> +#include <sys/prctl.h>
>> +#include <sys/socket.h>
>> +#include <sys/types.h>
>> +
>> +#include "common.h"
>> +
>> +#define MAX_SOCKET_NUM 10
>> +
>> +#define SOCK_PORT_START 3470
>> +#define SOCK_PORT_ADD 10
>> +
>> +#define IP_ADDRESS "127.0.0.1"
>> +
>> +/* Number pending connections queue to be hold */
>> +#define BACKLOG 10
> 
> "Number of pending connection queues to be hold." maybe? This is not use 
> in this patch so it shouldn't be added by this patch.
> 
   You are right. I will move it in the patch where listen() function 
appear. Thank you for noticing.
> 
>> +
>> +static int create_socket(struct __test_metadata *const _metadata,
>> +            bool ip6, bool reuse_addr)
> 
> This helper is good and I think you can improve it by leveraging test 
> variants. You could even factor out all the ipv4/ipv6 tests thanks to 
> new helpers such as bind_variant() and connect_variant(). No need to add 
> _metadata to those though. This would avoid duplicating all ipv4/ipv6 
> tests and even simplifying bind() and connect() calls. Something like this:
> 
> // rename "socket_test" to "socket" (no need to duplicate "test")
> FIXTURE_VARIANT(socket)
> {
>      const bool is_ipv4;
> };
> 
> /* clang-format off */
> FIXTURE_VARIANT_ADD(socket, ipv4) {
>      /* clang-format on */
>      .is_ipv4 = true,
> };
> 
> /* clang-format off */
> FIXTURE_VARIANT_ADD(socket, ipv6) {
>      /* clang-format on */
>      .is_ipv4 = false,
> };
> 
> static int socket_variant(const FIXTURE_VARIANT(socket) *const variant, 
> const int type)
> {
>      if (variant->is_ipv4)
>          return socket(AF_INET, type | SOCK_CLOEXEC, 0);
>      else
>          return socket(AF_INET6, type | SOCK_CLOEXEC, 0);
> }
> 
> socket_variant(variant, SOCK_STREAM);
> // this could be used to create UDP sockets too
> 
> 
> static int bind_variant(const FIXTURE_VARIANT(socket) *const variant, 
> const int sockfd, const FIXTURE_DATA(socket) *const self, const size_t 
> index)
> {
>      if (variant->is_ipv4)
>          return bind(sockfd, &self->addr4[index], 
> sizeof(self->addr4[index]));
>      else
>          return bind(sockfd, &self->addr6[index], 
> sizeof(self->addr6[index]));
> }
> 
> bind_variant(variant, sockfd, self, 0);
> 
  Ok. Thank you for this suggestion.
> 
>> +{
>> +        int sockfd;
>> +        int one = 1;
>> +
>> +        if (ip6)
>> +            sockfd = socket(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC, 0);
>> +        else
>> +            sockfd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
>> +
>> +        ASSERT_LE(0, sockfd);
>> +        /* Allows to reuse of local address */
>> +        if (reuse_addr)
>> +            ASSERT_EQ(0, setsockopt(sockfd, SOL_SOCKET,
>> +                    SO_REUSEADDR, &one, sizeof(one)));
> 
> This reuse_addr part is not used in this patch and I think it would 
> simplify this helper to not add reuse_addr but to explicitely call 
> setsockopt() when required. This also enables to get rid of _metadata in 
> this helper.
> 
   Yep. You are right. I will fix it.
> 
>> +        return sockfd;
>> +}
>> +
>> +FIXTURE(socket_test) {
>> +    uint port[MAX_SOCKET_NUM];
>> +    struct sockaddr_in addr4[MAX_SOCKET_NUM];
>> +    struct sockaddr_in6 addr6[MAX_SOCKET_NUM];
>> +};
>> +
>> +FIXTURE_SETUP(socket_test)
>> +{
>> +    int i;
>> +    /* Creates IP4 socket addresses */
>> +    for (i = 0; i < MAX_SOCKET_NUM; i++) {
> 
> Nice!
> 
>> +        self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
>> +        self->addr4[i].sin_family = AF_INET;
>> +        self->addr4[i].sin_port = htons(self->port[i]);
>> +        self->addr4[i].sin_addr.s_addr = htonl(INADDR_ANY);
> 
> Could you use the local addr (127.0.0.1) instead?

   Why cant I use INADDR_ANY here?
> 
>> +        memset(&(self->addr4[i].sin_zero), '\0', 8);
>> +    }
>> +
>> +    /* Creates IP6 socket addresses */
>> +    for (i = 0; i < MAX_SOCKET_NUM; i++) {
>> +        self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
>> +        self->addr6[i].sin6_family = AF_INET6;
>> +        self->addr6[i].sin6_port = htons(self->port[i]);
>> +        self->addr6[i].sin6_addr = in6addr_any;
> 
> ditto

   Why cant I use in6addr_any here?

> 
>> +    }
>> +
>> +    set_cap(_metadata, CAP_SYS_ADMIN);
>> +    ASSERT_EQ(0, unshare(CLONE_NEWNET));
>> +    ASSERT_EQ(0, system("ip link set dev lo up"));
> 
> If this is really required, could you avoid calling system() but set up 
> the network in C? You can strace it to see what is going on underneath.
> 
  I did check. It's a lot of code to be run under the hood (more than 
one line) and it will just will complicate the test so I suggest to 
leave just ONE line of code here.
> 
>> +    clear_cap(_metadata, CAP_SYS_ADMIN);
>> +}
>> +
>> +FIXTURE_TEARDOWN(socket_test)
>> +{ }
>> +
>> +TEST_F_FORK(socket_test, bind_no_restrictions_ip4) {
>> +
>> +    int sockfd;
>> +
>> +    sockfd = create_socket(_metadata, false, false);
>> +    ASSERT_LE(0, sockfd);
>> +
>> +    /* Binds a socket to port[0] */
> 
> This comment is not very useful in this context considering the below 
> line. It will be even more clear with the bind_variant() call.
> 
  Ok. I will fix it.
> 
>> +    ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr4[0], 
>> sizeof(self->addr4[0])));
>> +
>> +    ASSERT_EQ(0, close(sockfd));
>> +}
>> +
>> +TEST_F_FORK(socket_test, bind_no_restrictions_ip6) {
>> +
>> +    int sockfd;
>> +
>> +    sockfd = create_socket(_metadata, true, false);
>> +    ASSERT_LE(0, sockfd);
>> +
>> +    /* Binds a socket to port[0] */
>> +    ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr6[0], 
>> sizeof(self->addr6[0])));
>> +
>> +    ASSERT_EQ(0, close(sockfd));
>> +}
>> +
>> +TEST_F_FORK(socket_test, bind_with_restrictions_ip4) {
>> +
>> +    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 |
>> +                  LANDLOCK_ACCESS_NET_CONNECT_TCP,
>> +        .port = self->port[0],
>> +    };
>> +    struct landlock_net_service_attr net_service_2 = {
>> +        .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
>> +        .port = self->port[1],
>> +    };
>> +    struct landlock_net_service_attr net_service_3 = {
>> +        .allowed_access = 0,
>> +        .port = self->port[2],
>> +    };
>> +
>> +    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. */
> 
> This comment is useful though because the below call is more complex.
> 
   So I can leave it as it's, cant I?
> 
>> +    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,
>> +                &net_service_2, 0));
>> +    /* Empty allowed_access (i.e. deny rules) are ignored in network 
>> actions
>> +     * for port[2] socket.
>> +     */
>> +    ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, 
>> LANDLOCK_RULE_NET_SERVICE,
>> +                &net_service_3, 0));
>> +    ASSERT_EQ(ENOMSG, errno);
>> +
>> +    /* Enforces the ruleset. */
>> +    enforce_ruleset(_metadata, ruleset_fd);
>> +
>> +    sockfd = create_socket(_metadata, false, false);
>> +    ASSERT_LE(0, sockfd);
>> +    /* Binds a socket to port[0] */
>> +    ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr4[0], 
>> sizeof(self->addr4[0])));
>> +
>> +    /* Close bounded socket*/
>> +    ASSERT_EQ(0, close(sockfd));
>> +
>> +    sockfd = create_socket(_metadata, false, false);
>> +    ASSERT_LE(0, sockfd);
>> +    /* Binds a socket to port[1] */
>> +    ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr4[1], 
>> sizeof(self->addr4[1])));
>> +    ASSERT_EQ(EACCES, errno);
>> +
>> +    sockfd = create_socket(_metadata, false, false);
>> +    ASSERT_LE(0, sockfd);
>> +    /* Binds a socket to port[2] */
>> +    ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr4[2], 
>> sizeof(self->addr4[2])));
>> +    ASSERT_EQ(EACCES, errno);
>> +}
>> +
>> +TEST_F_FORK(socket_test, bind_with_restrictions_ip6) {
>> +
>> +    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 |
>> +                  LANDLOCK_ACCESS_NET_CONNECT_TCP,
>> +        .port = self->port[0],
>> +    };
>> +    struct landlock_net_service_attr net_service_2 = {
>> +        .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
>> +        .port = self->port[1],
>> +    };
>> +    struct landlock_net_service_attr net_service_3 = {
>> +        .allowed_access = 0,
>> +        .port = self->port[2],
>> +    };
>> +
>> +    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,
>> +                &net_service_2, 0));
>> +    /* Empty allowed_access (i.e. deny rules) are ignored in network 
>> actions
>> +     * for port[2] socket.
>> +     */
>> +    ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, 
>> LANDLOCK_RULE_NET_SERVICE,
>> +                &net_service_3, 0));
>> +    ASSERT_EQ(ENOMSG, errno);
>> +
>> +    /* Enforces the ruleset. */
>> +    enforce_ruleset(_metadata, ruleset_fd);
>> +
>> +    sockfd = create_socket(_metadata, true, false);
>> +    ASSERT_LE(0, sockfd);
>> +    /* Binds a socket to port[0] */
>> +    ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr6[0], 
>> sizeof(self->addr6[0])));
>> +
>> +    /* Close bounded socket*/
>> +    ASSERT_EQ(0, close(sockfd));
>> +
>> +    sockfd = create_socket(_metadata, false, false);
>> +    ASSERT_LE(0, sockfd);
>> +    /* Binds a socket to port[1] */
>> +    ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr6[1], 
>> sizeof(self->addr6[1])));
>> +    ASSERT_EQ(EACCES, errno);
>> +
>> +    sockfd = create_socket(_metadata, false, false);
>> +    ASSERT_LE(0, sockfd);
>> +    /* Binds a socket to port[2] */
>> +    ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr6[2], 
>> sizeof(self->addr6[2])));
>> +    ASSERT_EQ(EACCES, errno);
>> +}
>> +TEST_HARNESS_MAIN
>> -- 
>> 2.25.1
>>
> .
Mickaël Salaün May 19, 2022, 2:29 p.m. UTC | #3 
On 19/05/2022 14:10, Konstantin Meskhidze wrote:
> 
> 
> 5/17/2022 12:11 AM, Mickaël Salaün пишет:
>>
>> On 16/05/2022 17:20, Konstantin Meskhidze wrote:
>>> Adds selftests for bind socket action.
>>> The first is with no landlock restrictions:
>>>      - bind_no_restrictions_ip4;
>>>      - bind_no_restrictions_ip6;
>>> The second ones is with mixed landlock rules:
>>>      - bind_with_restrictions_ip4;
>>>      - bind_with_restrictions_ip6;
>>>
>>> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
>>> ---
>>>
>>> Changes since v3:
>>> * Split commit.
>>> * Add helper create_socket.
>>> * Add FIXTURE_SETUP.
>>>
>>> Changes since v4:
>>> * Adds port[MAX_SOCKET_NUM], struct sockaddr_in addr4
>>> and struct sockaddr_in addr6 in FIXTURE.
>>> * Refactoring FIXTURE_SETUP:
>>>      - initializing self->port, self->addr4 and self->addr6.
>>>      - adding network namespace.
>>> * Refactoring code with self->port, self->addr4 and
>>> self->addr6 variables.
>>> * Adds selftests for IP6 family:
>>>      - bind_no_restrictions_ip6.
>>>      - bind_with_restrictions_ip6.
>>> * Refactoring selftests/landlock/config
>>> * Moves enforce_ruleset() into common.h
>>>
>>> ---
>>>   tools/testing/selftests/landlock/common.h   |   9 +
>>>   tools/testing/selftests/landlock/config     |   5 +-
>>>   tools/testing/selftests/landlock/fs_test.c  |  10 -
>>>   tools/testing/selftests/landlock/net_test.c | 237 ++++++++++++++++++++
>>>   4 files changed, 250 insertions(+), 11 deletions(-)
>>>   create mode 100644 tools/testing/selftests/landlock/net_test.c
>>>
>>> diff --git a/tools/testing/selftests/landlock/common.h 
>>> b/tools/testing/selftests/landlock/common.h
>>> index 7ba18eb23783..c5381e641dfd 100644
>>> --- a/tools/testing/selftests/landlock/common.h
>>> +++ b/tools/testing/selftests/landlock/common.h
>>> @@ -102,6 +102,15 @@ static inline int landlock_restrict_self(const 
>>> int ruleset_fd,
>>>   }
>>>   #endif
>>>
>>> +static void enforce_ruleset(struct __test_metadata *const _metadata,
>>> +        const int ruleset_fd)
>>> +{
>>> +    ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
>>> +    ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0)) {
>>> +        TH_LOG("Failed to enforce ruleset: %s", strerror(errno));
>>> +    }
>>> +}
>>> +
>>
>> Please create a commit which moves all the needed code for all network 
>> tests. I think there is only this helper though.
> 
>    Ok. I will create one additional commit for moving this helper.
>    But after I have moved the helper to common.h, I got warnings while 
> compiling seltests where I don't use the one (base_test and ptrace_test)

Move it after clear_cap() and use the same attributes.

[...]

 >>> diff --git a/tools/testing/selftests/landlock/config
 >>> b/tools/testing/selftests/landlock/config
 >>> index 0f0a65287bac..b56f3274d3f5 100644
 >>> --- a/tools/testing/selftests/landlock/config
 >>> +++ b/tools/testing/selftests/landlock/config
 >>> @@ -1,7 +1,10 @@
 >>> +CONFIG_INET=y
 >>> +CONFIG_IPV6=y
 >>> +CONFIG_NET=y
 >>>   CONFIG_OVERLAY_FS=y
 >>>   CONFIG_SECURITY_LANDLOCK=y
 >>>   CONFIG_SECURITY_PATH=y
 >>>   CONFIG_SECURITY=y
 >>>   CONFIG_SHMEM=y
 >>>   CONFIG_TMPFS_XATTR=y
 >>> -CONFIG_TMPFS=y
 >>> +CONFIG_TMPFS=y
 >>> \ No newline at end of file

You also need to add CONFIG_NET_NS.

[...]

>>
>>> +        self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
>>> +        self->addr4[i].sin_family = AF_INET;
>>> +        self->addr4[i].sin_port = htons(self->port[i]);
>>> +        self->addr4[i].sin_addr.s_addr = htonl(INADDR_ANY);
>>
>> Could you use the local addr (127.0.0.1) instead?
> 
>    Why cant I use INADDR_ANY here?

You can, but it is cleaner to bind to a specified address (i.e. you 
control where a connection come from), and I guess this variable/address 
could be used to establish connections as well.

>>
>>> +        memset(&(self->addr4[i].sin_zero), '\0', 8);
>>> +    }
>>> +
>>> +    /* Creates IP6 socket addresses */
>>> +    for (i = 0; i < MAX_SOCKET_NUM; i++) {
>>> +        self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
>>> +        self->addr6[i].sin6_family = AF_INET6;
>>> +        self->addr6[i].sin6_port = htons(self->port[i]);
>>> +        self->addr6[i].sin6_addr = in6addr_any;
>>
>> ditto
> 
>    Why cant I use in6addr_any here?

Same as for IPV4.

> 
>>
>>> +    }
>>> +
>>> +    set_cap(_metadata, CAP_SYS_ADMIN);
>>> +    ASSERT_EQ(0, unshare(CLONE_NEWNET));
>>> +    ASSERT_EQ(0, system("ip link set dev lo up"));
>>
>> If this is really required, could you avoid calling system() but set 
>> up the network in C? You can strace it to see what is going on 
>> underneath.
>>
>   I did check. It's a lot of code to be run under the hood (more than 
> one line) and it will just will complicate the test so I suggest to 
> leave just ONE line of code here.

OK


>>
>>> +    clear_cap(_metadata, CAP_SYS_ADMIN);
>>> +}
>>> +
>>> +FIXTURE_TEARDOWN(socket_test)
>>> +{ }
>>> +
>>> +TEST_F_FORK(socket_test, bind_no_restrictions_ip4) {
>>> +
>>> +    int sockfd;
>>> +
>>> +    sockfd = create_socket(_metadata, false, false);
>>> +    ASSERT_LE(0, sockfd);
>>> +
>>> +    /* Binds a socket to port[0] */
>>
>> This comment is not very useful in this context considering the below 
>> line. It will be even more clear with the bind_variant() call.
>>
>   Ok. I will fix it.
>>
>>> +    ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr4[0], 
>>> sizeof(self->addr4[0])));
>>> +
>>> +    ASSERT_EQ(0, close(sockfd));
>>> +}
>>> +
>>> +TEST_F_FORK(socket_test, bind_no_restrictions_ip6) {
>>> +
>>> +    int sockfd;
>>> +
>>> +    sockfd = create_socket(_metadata, true, false);
>>> +    ASSERT_LE(0, sockfd);
>>> +
>>> +    /* Binds a socket to port[0] */
>>> +    ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr6[0], 
>>> sizeof(self->addr6[0])));
>>> +
>>> +    ASSERT_EQ(0, close(sockfd));
>>> +}
>>> +
>>> +TEST_F_FORK(socket_test, bind_with_restrictions_ip4) {
>>> +
>>> +    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 |
>>> +                  LANDLOCK_ACCESS_NET_CONNECT_TCP,
>>> +        .port = self->port[0],
>>> +    };
>>> +    struct landlock_net_service_attr net_service_2 = {
>>> +        .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
>>> +        .port = self->port[1],
>>> +    };
>>> +    struct landlock_net_service_attr net_service_3 = {
>>> +        .allowed_access = 0,
>>> +        .port = self->port[2],
>>> +    };
>>> +
>>> +    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. */
>>
>> This comment is useful though because the below call is more complex.
>>
>    So I can leave it as it's, cant I?

Yes, keep it, I'd just like a fair amount of useful comments. ;)
Konstantin Meskhidze (A) May 24, 2022, 8:34 a.m. UTC | #4 
5/19/2022 5:29 PM, Mickaël Salaün пишет:
> 
> On 19/05/2022 14:10, Konstantin Meskhidze wrote:
>>
>>
>> 5/17/2022 12:11 AM, Mickaël Salaün пишет:
>>>
>>> On 16/05/2022 17:20, Konstantin Meskhidze wrote:
>>>> Adds selftests for bind socket action.
>>>> The first is with no landlock restrictions:
>>>>      - bind_no_restrictions_ip4;
>>>>      - bind_no_restrictions_ip6;
>>>> The second ones is with mixed landlock rules:
>>>>      - bind_with_restrictions_ip4;
>>>>      - bind_with_restrictions_ip6;
>>>>
>>>> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
>>>> ---
>>>>
>>>> Changes since v3:
>>>> * Split commit.
>>>> * Add helper create_socket.
>>>> * Add FIXTURE_SETUP.
>>>>
>>>> Changes since v4:
>>>> * Adds port[MAX_SOCKET_NUM], struct sockaddr_in addr4
>>>> and struct sockaddr_in addr6 in FIXTURE.
>>>> * Refactoring FIXTURE_SETUP:
>>>>      - initializing self->port, self->addr4 and self->addr6.
>>>>      - adding network namespace.
>>>> * Refactoring code with self->port, self->addr4 and
>>>> self->addr6 variables.
>>>> * Adds selftests for IP6 family:
>>>>      - bind_no_restrictions_ip6.
>>>>      - bind_with_restrictions_ip6.
>>>> * Refactoring selftests/landlock/config
>>>> * Moves enforce_ruleset() into common.h
>>>>
>>>> ---
>>>>   tools/testing/selftests/landlock/common.h   |   9 +
>>>>   tools/testing/selftests/landlock/config     |   5 +-
>>>>   tools/testing/selftests/landlock/fs_test.c  |  10 -
>>>>   tools/testing/selftests/landlock/net_test.c | 237 
>>>> ++++++++++++++++++++
>>>>   4 files changed, 250 insertions(+), 11 deletions(-)
>>>>   create mode 100644 tools/testing/selftests/landlock/net_test.c
>>>>
>>>> diff --git a/tools/testing/selftests/landlock/common.h 
>>>> b/tools/testing/selftests/landlock/common.h
>>>> index 7ba18eb23783..c5381e641dfd 100644
>>>> --- a/tools/testing/selftests/landlock/common.h
>>>> +++ b/tools/testing/selftests/landlock/common.h
>>>> @@ -102,6 +102,15 @@ static inline int landlock_restrict_self(const 
>>>> int ruleset_fd,
>>>>   }
>>>>   #endif
>>>>
>>>> +static void enforce_ruleset(struct __test_metadata *const _metadata,
>>>> +        const int ruleset_fd)
>>>> +{
>>>> +    ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
>>>> +    ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0)) {
>>>> +        TH_LOG("Failed to enforce ruleset: %s", strerror(errno));
>>>> +    }
>>>> +}
>>>> +
>>>
>>> Please create a commit which moves all the needed code for all 
>>> network tests. I think there is only this helper though.
>>
>>    Ok. I will create one additional commit for moving this helper.
>>    But after I have moved the helper to common.h, I got warnings while 
>> compiling seltests where I don't use the one (base_test and ptrace_test)
> 
> Move it after clear_cap() and use the same attributes.
> 
   Ok. Thank you.
> [...]
> 
>  >>> diff --git a/tools/testing/selftests/landlock/config
>  >>> b/tools/testing/selftests/landlock/config
>  >>> index 0f0a65287bac..b56f3274d3f5 100644
>  >>> --- a/tools/testing/selftests/landlock/config
>  >>> +++ b/tools/testing/selftests/landlock/config
>  >>> @@ -1,7 +1,10 @@
>  >>> +CONFIG_INET=y
>  >>> +CONFIG_IPV6=y
>  >>> +CONFIG_NET=y
>  >>>   CONFIG_OVERLAY_FS=y
>  >>>   CONFIG_SECURITY_LANDLOCK=y
>  >>>   CONFIG_SECURITY_PATH=y
>  >>>   CONFIG_SECURITY=y
>  >>>   CONFIG_SHMEM=y
>  >>>   CONFIG_TMPFS_XATTR=y
>  >>> -CONFIG_TMPFS=y
>  >>> +CONFIG_TMPFS=y
>  >>> \ No newline at end of file
> 
> You also need to add CONFIG_NET_NS.

   Yep. I have forgotten about it. Thanks.
> 
> [...]
> 
>>>
>>>> +        self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
>>>> +        self->addr4[i].sin_family = AF_INET;
>>>> +        self->addr4[i].sin_port = htons(self->port[i]);
>>>> +        self->addr4[i].sin_addr.s_addr = htonl(INADDR_ANY);
>>>
>>> Could you use the local addr (127.0.0.1) instead?
>>
>>    Why cant I use INADDR_ANY here?
> 
> You can, but it is cleaner to bind to a specified address (i.e. you 
> control where a connection come from), and I guess this variable/address 
> could be used to establish connections as well.
> 
  Ok. I got it.
>>>
>>>> +        memset(&(self->addr4[i].sin_zero), '\0', 8);
>>>> +    }
>>>> +
>>>> +    /* Creates IP6 socket addresses */
>>>> +    for (i = 0; i < MAX_SOCKET_NUM; i++) {
>>>> +        self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
>>>> +        self->addr6[i].sin6_family = AF_INET6;
>>>> +        self->addr6[i].sin6_port = htons(self->port[i]);
>>>> +        self->addr6[i].sin6_addr = in6addr_any;
>>>
>>> ditto
>>
>>    Why cant I use in6addr_any here?
> 
> Same as for IPV4.

   Ok.
> 
>>
>>>
>>>> +    }
>>>> +
>>>> +    set_cap(_metadata, CAP_SYS_ADMIN);
>>>> +    ASSERT_EQ(0, unshare(CLONE_NEWNET));
>>>> +    ASSERT_EQ(0, system("ip link set dev lo up"));
>>>
>>> If this is really required, could you avoid calling system() but set 
>>> up the network in C? You can strace it to see what is going on 
>>> underneath.
>>>
>>   I did check. It's a lot of code to be run under the hood (more than 
>> one line) and it will just will complicate the test so I suggest to 
>> leave just ONE line of code here.
> 
> OK
> 
> 
>>>
>>>> +    clear_cap(_metadata, CAP_SYS_ADMIN);
>>>> +}
>>>> +
>>>> +FIXTURE_TEARDOWN(socket_test)
>>>> +{ }
>>>> +
>>>> +TEST_F_FORK(socket_test, bind_no_restrictions_ip4) {
>>>> +
>>>> +    int sockfd;
>>>> +
>>>> +    sockfd = create_socket(_metadata, false, false);
>>>> +    ASSERT_LE(0, sockfd);
>>>> +
>>>> +    /* Binds a socket to port[0] */
>>>
>>> This comment is not very useful in this context considering the below 
>>> line. It will be even more clear with the bind_variant() call.
>>>
>>   Ok. I will fix it.
>>>
>>>> +    ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr4[0], 
>>>> sizeof(self->addr4[0])));
>>>> +
>>>> +    ASSERT_EQ(0, close(sockfd));
>>>> +}
>>>> +
>>>> +TEST_F_FORK(socket_test, bind_no_restrictions_ip6) {
>>>> +
>>>> +    int sockfd;
>>>> +
>>>> +    sockfd = create_socket(_metadata, true, false);
>>>> +    ASSERT_LE(0, sockfd);
>>>> +
>>>> +    /* Binds a socket to port[0] */
>>>> +    ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr6[0], 
>>>> sizeof(self->addr6[0])));
>>>> +
>>>> +    ASSERT_EQ(0, close(sockfd));
>>>> +}
>>>> +
>>>> +TEST_F_FORK(socket_test, bind_with_restrictions_ip4) {
>>>> +
>>>> +    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 |
>>>> +                  LANDLOCK_ACCESS_NET_CONNECT_TCP,
>>>> +        .port = self->port[0],
>>>> +    };
>>>> +    struct landlock_net_service_attr net_service_2 = {
>>>> +        .allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
>>>> +        .port = self->port[1],
>>>> +    };
>>>> +    struct landlock_net_service_attr net_service_3 = {
>>>> +        .allowed_access = 0,
>>>> +        .port = self->port[2],
>>>> +    };
>>>> +
>>>> +    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. */
>>>
>>> This comment is useful though because the below call is more complex.
>>>
>>    So I can leave it as it's, cant I?
> 
> Yes, keep it, I'd just like a fair amount of useful comments. ;)

   Ok. Thank you!
> .
diff mbox series

Patch

diff --git a/tools/testing/selftests/landlock/common.h b/tools/testing/selftests/landlock/common.h
index 7ba18eb23783..c5381e641dfd 100644
--- a/tools/testing/selftests/landlock/common.h
+++ b/tools/testing/selftests/landlock/common.h
@@ -102,6 +102,15 @@  static inline int landlock_restrict_self(const int ruleset_fd,
 }
 #endif

+static void enforce_ruleset(struct __test_metadata *const _metadata,
+		const int ruleset_fd)
+{
+	ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
+	ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0)) {
+		TH_LOG("Failed to enforce ruleset: %s", strerror(errno));
+	}
+}
+
 static void _init_caps(struct __test_metadata *const _metadata, bool drop_all)
 {
 	cap_t cap_p;
diff --git a/tools/testing/selftests/landlock/config b/tools/testing/selftests/landlock/config
index 0f0a65287bac..b56f3274d3f5 100644
--- a/tools/testing/selftests/landlock/config
+++ b/tools/testing/selftests/landlock/config
@@ -1,7 +1,10 @@ 
+CONFIG_INET=y
+CONFIG_IPV6=y
+CONFIG_NET=y
 CONFIG_OVERLAY_FS=y
 CONFIG_SECURITY_LANDLOCK=y
 CONFIG_SECURITY_PATH=y
 CONFIG_SECURITY=y
 CONFIG_SHMEM=y
 CONFIG_TMPFS_XATTR=y
-CONFIG_TMPFS=y
+CONFIG_TMPFS=y
\ No newline at end of file
diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
index 21a2ce8fa739..036dd6f8f9ea 100644
--- a/tools/testing/selftests/landlock/fs_test.c
+++ b/tools/testing/selftests/landlock/fs_test.c
@@ -551,16 +551,6 @@  static int create_ruleset(struct __test_metadata *const _metadata,
 	return ruleset_fd;
 }

-static void enforce_ruleset(struct __test_metadata *const _metadata,
-			    const int ruleset_fd)
-{
-	ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
-	ASSERT_EQ(0, landlock_restrict_self(ruleset_fd, 0))
-	{
-		TH_LOG("Failed to enforce ruleset: %s", strerror(errno));
-	}
-}
-
 TEST_F_FORK(layout1, proc_nsfs)
 {
 	const struct rule rules[] = {
diff --git a/tools/testing/selftests/landlock/net_test.c b/tools/testing/selftests/landlock/net_test.c
new file mode 100644
index 000000000000..478ef2eff559
--- /dev/null
+++ b/tools/testing/selftests/landlock/net_test.c
@@ -0,0 +1,237 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Landlock tests - Network
+ *
+ * Copyright (C) 2022 Huawei Tech. Co., Ltd.
+ */
+
+#define _GNU_SOURCE
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/landlock.h>
+#include <netinet/in.h>
+#include <sched.h>
+#include <string.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include "common.h"
+
+#define MAX_SOCKET_NUM 10
+
+#define SOCK_PORT_START 3470
+#define SOCK_PORT_ADD 10
+
+#define IP_ADDRESS "127.0.0.1"
+
+/* Number pending connections queue to be hold */
+#define BACKLOG 10
+
+static int create_socket(struct __test_metadata *const _metadata,
+			bool ip6, bool reuse_addr)
+{
+		int sockfd;
+		int one = 1;
+
+		if (ip6)
+			sockfd = socket(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC, 0);
+		else
+			sockfd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
+
+		ASSERT_LE(0, sockfd);
+		/* Allows to reuse of local address */
+		if (reuse_addr)
+			ASSERT_EQ(0, setsockopt(sockfd, SOL_SOCKET,
+					SO_REUSEADDR, &one, sizeof(one)));
+		return sockfd;
+}
+
+FIXTURE(socket_test) {
+	uint port[MAX_SOCKET_NUM];
+	struct sockaddr_in addr4[MAX_SOCKET_NUM];
+	struct sockaddr_in6 addr6[MAX_SOCKET_NUM];
+};
+
+FIXTURE_SETUP(socket_test)
+{
+	int i;
+	/* Creates IP4 socket addresses */
+	for (i = 0; i < MAX_SOCKET_NUM; i++) {
+		self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
+		self->addr4[i].sin_family = AF_INET;
+		self->addr4[i].sin_port = htons(self->port[i]);
+		self->addr4[i].sin_addr.s_addr = htonl(INADDR_ANY);
+		memset(&(self->addr4[i].sin_zero), '\0', 8);
+	}
+
+	/* Creates IP6 socket addresses */
+	for (i = 0; i < MAX_SOCKET_NUM; i++) {
+		self->port[i] = SOCK_PORT_START + SOCK_PORT_ADD*i;
+		self->addr6[i].sin6_family = AF_INET6;
+		self->addr6[i].sin6_port = htons(self->port[i]);
+		self->addr6[i].sin6_addr = in6addr_any;
+	}
+
+	set_cap(_metadata, CAP_SYS_ADMIN);
+	ASSERT_EQ(0, unshare(CLONE_NEWNET));
+	ASSERT_EQ(0, system("ip link set dev lo up"));
+	clear_cap(_metadata, CAP_SYS_ADMIN);
+}
+
+FIXTURE_TEARDOWN(socket_test)
+{ }
+
+TEST_F_FORK(socket_test, bind_no_restrictions_ip4) {
+
+	int sockfd;
+
+	sockfd = create_socket(_metadata, false, false);
+	ASSERT_LE(0, sockfd);
+
+	/* Binds a socket to port[0] */
+	ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr4[0], sizeof(self->addr4[0])));
+
+	ASSERT_EQ(0, close(sockfd));
+}
+
+TEST_F_FORK(socket_test, bind_no_restrictions_ip6) {
+
+	int sockfd;
+
+	sockfd = create_socket(_metadata, true, false);
+	ASSERT_LE(0, sockfd);
+
+	/* Binds a socket to port[0] */
+	ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr6[0], sizeof(self->addr6[0])));
+
+	ASSERT_EQ(0, close(sockfd));
+}
+
+TEST_F_FORK(socket_test, bind_with_restrictions_ip4) {
+
+	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 |
+				  LANDLOCK_ACCESS_NET_CONNECT_TCP,
+		.port = self->port[0],
+	};
+	struct landlock_net_service_attr net_service_2 = {
+		.allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
+		.port = self->port[1],
+	};
+	struct landlock_net_service_attr net_service_3 = {
+		.allowed_access = 0,
+		.port = self->port[2],
+	};
+
+	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,
+				&net_service_2, 0));
+	/* Empty allowed_access (i.e. deny rules) are ignored in network actions
+	 * for port[2] socket.
+	 */
+	ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
+				&net_service_3, 0));
+	ASSERT_EQ(ENOMSG, errno);
+
+	/* Enforces the ruleset. */
+	enforce_ruleset(_metadata, ruleset_fd);
+
+	sockfd = create_socket(_metadata, false, false);
+	ASSERT_LE(0, sockfd);
+	/* Binds a socket to port[0] */
+	ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr4[0], sizeof(self->addr4[0])));
+
+	/* Close bounded socket*/
+	ASSERT_EQ(0, close(sockfd));
+
+	sockfd = create_socket(_metadata, false, false);
+	ASSERT_LE(0, sockfd);
+	/* Binds a socket to port[1] */
+	ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr4[1], sizeof(self->addr4[1])));
+	ASSERT_EQ(EACCES, errno);
+
+	sockfd = create_socket(_metadata, false, false);
+	ASSERT_LE(0, sockfd);
+	/* Binds a socket to port[2] */
+	ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr4[2], sizeof(self->addr4[2])));
+	ASSERT_EQ(EACCES, errno);
+}
+
+TEST_F_FORK(socket_test, bind_with_restrictions_ip6) {
+
+	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 |
+				  LANDLOCK_ACCESS_NET_CONNECT_TCP,
+		.port = self->port[0],
+	};
+	struct landlock_net_service_attr net_service_2 = {
+		.allowed_access = LANDLOCK_ACCESS_NET_CONNECT_TCP,
+		.port = self->port[1],
+	};
+	struct landlock_net_service_attr net_service_3 = {
+		.allowed_access = 0,
+		.port = self->port[2],
+	};
+
+	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,
+				&net_service_2, 0));
+	/* Empty allowed_access (i.e. deny rules) are ignored in network actions
+	 * for port[2] socket.
+	 */
+	ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
+				&net_service_3, 0));
+	ASSERT_EQ(ENOMSG, errno);
+
+	/* Enforces the ruleset. */
+	enforce_ruleset(_metadata, ruleset_fd);
+
+	sockfd = create_socket(_metadata, true, false);
+	ASSERT_LE(0, sockfd);
+	/* Binds a socket to port[0] */
+	ASSERT_EQ(0, bind(sockfd, (struct sockaddr *)&self->addr6[0], sizeof(self->addr6[0])));
+
+	/* Close bounded socket*/
+	ASSERT_EQ(0, close(sockfd));
+
+	sockfd = create_socket(_metadata, false, false);
+	ASSERT_LE(0, sockfd);
+	/* Binds a socket to port[1] */
+	ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr6[1], sizeof(self->addr6[1])));
+	ASSERT_EQ(EACCES, errno);
+
+	sockfd = create_socket(_metadata, false, false);
+	ASSERT_LE(0, sockfd);
+	/* Binds a socket to port[2] */
+	ASSERT_EQ(-1, bind(sockfd, (struct sockaddr *)&self->addr6[2], sizeof(self->addr6[2])));
+	ASSERT_EQ(EACCES, errno);
+}
+TEST_HARNESS_MAIN