[Tor-BSD] [CFT] HardenedBSD's security/tor-capsicum port

George Rosamond george at ceetonetechnology.com
Tue Feb 27 15:39:00 EST 2018

Shawn Webb:
> On Wed, Feb 28, 2018 at 07:31:35AM +1100, teor wrote:
>>> On 28 Feb 2018, at 06:03, Shawn Webb <shawn.webb at hardenedbsd.org> wrote:
>>>> On Tue, Feb 27, 2018 at 01:44:00PM -0500, Shawn Webb wrote:
>>>>> On Tue, Feb 27, 2018 at 12:48:29PM -0500, Shawn Webb wrote:
>>>>> Hey All,
>>>>> Many of you know that I've been working on Capsicum support in Tor.
>>>>> I've added a ports entry for it in the HardenedBSD ports tree,
>>>>> security/tor-capsicum.
>>>>> To enable capmode, you'll need to add "Sandbox 1" to your torrc. Note
>>>>> that since libevent does not support Capsicum and creates sockets on
>>>>> its own, using DNSPort (most commonly used in transparent proxy
>>>>> setups) with capmode enabled is unsupported. I've filed a bug report
>>>>> with libevent to start the discussion around adding a
>>>>> Capsicum-friendly API for socket creation/maintenance.
>>>>> On HardenedBSD 12-CURRENT/amd64, security/tor-capsicum is compiled with:
>>>>>  - PIE
>>>>>  - Full RELRO
>>>>>  - CFI (without the cfi-icall scheme)
>>>>>  - SafeStack
>>>>>  - Retpoline
>>>>>  - Capsicum support
>>>>> Please test and let me know any success or failure stories.
>>>> I've now tested in relay mode. It appears there's a bug that prevents
>>>> relay mode from working. I hope to have this resolved within a week.
>>>> So, don't run with Capsicum enabled if you're running a relay.
>>>> However, please test if you're running simply as a client node.
>>> This is due to Tor using libevent to handle DNS when in relay mode. As
>>> noted above, libevent does not support Capsicum. So fixing relay mode
>>> will require a Capsicum-friendly libevent.
>> Does Capsicum work for non-exit relays?
>> They shouldn't use DNS for anything important.
> It doesn't. Tor is still calling the evdns_* API for some reason. I
> need to do some extra digging to figure out the full call stack to see
> why the tor daemon is doing DNS stuff in a non-exit relay
> configuration.

It was *just* submitted as a tarball for OpenBSD ports.. not that it's
related to capsicum.


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