netdev - Re: [PATCH v11 12/12] landlock: Document Landlock's network support

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Message-ID: <b40ceb8e-8cba-6a8e-e499-b1f225c0901a@huawei.com>
Date: Mon, 3 Jul 2023 13:42:44 +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>, <yusongping@...wei.com>,
	<artem.kuzin@...wei.com>
Subject: Re: [PATCH v11 12/12] landlock: Document Landlock's network support



6/26/2023 9:59 PM, Mickaël Salaün пишет:
> 
> On 15/05/2023 18:13, Konstantin Meskhidze wrote:
>> Describe network access rules for TCP sockets. Add network access
>> example in the tutorial. Add kernel configuration support for network.
>> 
>> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
>> ---
>> 
>> Changes since v10:
>> * Fixes documentaion as Mickaёl suggested:
>> https://lore.kernel.org/linux-security-module/ec23be77-566e-c8fd-179e-f50e025ac2cf@digikod.net/
>> 
>> Changes since v9:
>> * Minor refactoring.
>> 
>> Changes since v8:
>> * Minor refactoring.
>> 
>> Changes since v7:
>> * Fixes documentaion logic errors and typos as Mickaёl suggested:
>> https://lore.kernel.org/netdev/9f354862-2bc3-39ea-92fd-53803d9bbc21@digikod.net/
>> 
>> Changes since v6:
>> * Adds network support documentaion.
>> 
>> ---
>>   Documentation/userspace-api/landlock.rst | 83 ++++++++++++++++++------
>>   1 file changed, 62 insertions(+), 21 deletions(-)
>> 
> 
> [...]
> 
>> @@ -143,10 +159,23 @@ for the ruleset creation, by filtering access rights according to the Landlock
>>   ABI version.  In this example, this is not required because all of the requested
>>   ``allowed_access`` rights are already available in ABI 1.
>> 
>> -We now have a ruleset with one rule allowing read access to ``/usr`` while
>> -denying all other handled accesses for the filesystem.  The next step is to
>> -restrict the current thread from gaining more privileges (e.g. thanks to a SUID
>> -binary).
>> +For network access-control, we can add a set of rules that allow to use a port
>> +number for a specific action: HTTPS connections.
>> +
>> +.. code-block:: c
>> +
>> +    struct landlock_net_service_attr net_service = {
>> +        .allowed_access = NET_CONNECT_TCP,
> 
> LANDLOCK_ACCESS_NET_CONNECT_TCP

   Yep. Thanks.
> 
> 
>> +        .port = 443,
>> +    };
>> +
>> +    err = landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_SERVICE,
>> +                            &net_service, 0);
>> +
> .