From: Konstantin Meskhidze <konstantin.meskhidze@huawei.com>
To: <mic@digikod.net>
Cc: <linux-security-module@vger.kernel.org>, <netdev@vger.kernel.org>,
<netfilter@vger.kernel.org>, <yusongping@huawei.com>,
<artem.kuzin@huawei.com>
Subject: [RFC PATCH 0/2] landlock network implementation cover letter
Date: Mon, 24 Jan 2022 16:02:13 +0800 [thread overview]
Message-ID: <20220124080215.265538-1-konstantin.meskhidze@huawei.com> (raw)
Hi, all!
This is a new bunch of RFC patches related to Landlock LSM network confinement.
Here are previous discussions:
1. https://lore.kernel.org/linux-security-module/20211210072123.386713-1-konstantin.meskhidze@huawei.com/
2. https://lore.kernel.org/linux-security-module/20211228115212.703084-1-konstantin.meskhidze@huawei.com/
As in previous RFCs, 2 hooks are supported:
- hook_socket_bind()
- hook_socket_connect()
Selftest are provided in tools/testing/selftests/landlock/network_test.c;
Implementation was tested in QEMU invironment with 5.13 kernel version:
1. base_test - passed all tests
2. fs_test - passed 44/46 tests. 2 tests related to overlayfs failed.
Probably, I have wrong config options for overlayfs.
3. network_test - passed all tests.
Please give your suggestions about test cover in network_test.c
Implementation related issues
=============================
1. Access masks array refactored into 1D one and changed
to 32 bits. Filesystem masks occupy 16 lower bits and network
masks reside in 16 upper bits.
struct landlock_ruleset {
...
...
u32 access_masks[];
}
2. Refactor API functions in ruleset.c:
1. Add (void *)object argument.
2. Add u16 rule_type argument.
- In filesystem case the "object" is defined by underlying inode.
In network case the "object" is defined by a port. There is
a union containing either a struct landlock_object pointer or a
raw data (here a u16 port):
union {
struct landlock_object *ptr;
uintptr_t data;
} object;
- Everytime when a rule is inserted it's needed to provide a rule type:
landlock_insert_rule(ruleset, (void *)object, access, rule_type)
1. A rule_type could be or LANDLOCK_RULE_NET_SERVICE or
LANDLOCK_RULE_PATH_BENEATH;
2. (void *) object - is either landlock_object *ptr or port value;
3. Use two rb_trees in ruleset structure:
1. root_inode - for filesystem objects (inodes).
2. root_net_port - for network port objects.
Konstantin Meskhidze (2):
landlock: TCP network hooks implementation
landlock: selftests for bind and connect hooks
include/uapi/linux/landlock.h | 52 +++
security/landlock/Makefile | 2 +-
security/landlock/fs.c | 12 +-
security/landlock/limits.h | 6 +
security/landlock/net.c | 175 +++++++++
security/landlock/net.h | 21 ++
security/landlock/ruleset.c | 167 ++++++---
security/landlock/ruleset.h | 40 +-
security/landlock/setup.c | 3 +
security/landlock/syscalls.c | 142 ++++---
.../testing/selftests/landlock/network_test.c | 346 ++++++++++++++++++
11 files changed, 860 insertions(+), 106 deletions(-)
create mode 100644 security/landlock/net.c
create mode 100644 security/landlock/net.h
create mode 100644 tools/testing/selftests/landlock/network_test.c
--
2.25.1
next reply other threads:[~2022-01-24 8:02 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-24 8:02 Konstantin Meskhidze [this message]
2022-01-24 8:02 ` [RFC PATCH 1/2] landlock: TCP network hooks implementation Konstantin Meskhidze
2022-01-25 14:17 ` Willem de Bruijn
2022-01-26 8:05 ` Konstantin Meskhidze
2022-01-26 14:15 ` Willem de Bruijn
2022-01-29 3:12 ` Konstantin Meskhidze
2022-01-31 17:14 ` Willem de Bruijn
2022-02-01 12:33 ` Mickaël Salaün
2022-02-07 2:31 ` Konstantin Meskhidze
2022-02-07 16:00 ` Willem de Bruijn
2022-02-07 16:17 ` Willem de Bruijn
2022-02-10 2:05 ` Konstantin Meskhidze
2022-02-10 2:04 ` Konstantin Meskhidze
2022-02-01 12:28 ` Mickaël Salaün
2022-02-07 2:35 ` Konstantin Meskhidze
2022-02-01 12:13 ` Mickaël Salaün
2022-02-07 13:09 ` Konstantin Meskhidze
2022-02-07 14:17 ` Mickaël Salaün
2022-02-08 7:55 ` Konstantin Meskhidze
2022-02-08 12:09 ` Mickaël Salaün
2022-02-09 3:06 ` Konstantin Meskhidze
2022-01-24 8:02 ` [RFC PATCH 2/2] landlock: selftests for bind and connect hooks Konstantin Meskhidze
2022-02-01 18:31 ` Mickaël Salaün
2022-02-07 7:11 ` Konstantin Meskhidze
2022-02-07 12:49 ` Mickaël Salaün
2022-02-08 3:01 ` Konstantin Meskhidze
2022-02-08 12:17 ` Mickaël Salaün
2022-02-09 3:03 ` Konstantin Meskhidze
2022-02-10 10:16 ` Mickaël Salaün
2022-02-24 3:18 ` Konstantin Meskhidze
2022-02-24 9:55 ` Mickaël Salaün
2022-02-24 12:03 ` Konstantin Meskhidze
2022-02-24 14:15 ` Mickaël Salaün
2022-02-25 2:44 ` Konstantin Meskhidze
2022-02-01 17:53 ` [RFC PATCH 0/2] landlock network implementation cover letter Mickaël Salaün
2022-02-07 13:18 ` Konstantin Meskhidze
2022-02-07 13:35 ` Mickaël Salaün
2022-02-08 3:53 ` Konstantin Meskhidze
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