netdev - Re: [PATCH] net: change capability used by socket options IP{,V6}

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Message-ID: <CAHo-OoyGVzG-UDr=BMoLXVUdn2xBfFWtcp-jb9qKMyxvzJeniA@mail.gmail.com>
Date:	Tue, 13 Sep 2011 23:45:26 -0700
From:	Maciej Żenczykowski <zenczykowski@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Balazs Scheidler <bazsi@...abit.hu>
Subject: Re: [PATCH] net: change capability used by socket options IP{,V6}_TRANSPARENT

>> From: Maciej Żenczykowski <maze@...gle.com>
>>
>> Up till now the IP{,V6}_TRANSPARENT socket options (which actually set
>> the same bit in the socket struct) have required CAP_NET_ADMIN
>> privileges to set or clear the option.
>>
>> - we make clearing the bit not require any privileges.
>> - we deprecate using CAP_NET_ADMIN for this purpose.
>> - we introduce a new capability CAP_NET_TRANSPARENT,
>>   which is tailored to allow setting just this bit.
>> - we allow either one of CAP_NET_TRANSPARENT or CAP_NET_RAW
>>   to set this bit, because raw sockets already effectively
>>   allow you to emulate socket transparency, and make the
>>   transition easier for apps not desiring to use a brand
>>   new capability (because of header file or glibc support)
>> - we print a warning (but allow it) if you try to set
>>   the socket option with CAP_NET_ADMIN privs, but without
>>   either one of CAP_NET_TRANSPARENT or CAP_NET_RAW.
>>
>> The reason for introducing a new capability is that while
>> transparent sockets are potentially dangerous (and can let you
>> spoof your source IP on traffic), they don't normally give you
>> the full 'freedom' of eavesdropping and/or spoofing that raw sockets
>> give you.
>>
>> Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
>> CC: Balazs Scheidler <bazsi@...abit.hu>
>
> This is ok for me, as long as the security maintainers allow the
> introduction of this new cap.
>
> Thanks for doing this and sorry for the late reply.
>
> Acked-by: Balazs Scheidler <bazsi@...abit.hu>
>
> --
> Bazsi

I'm not really sure who else to CC on this...
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