From: Jeff King <peff@peff.net>
To: Brandon Williams <bmwill@google.com>
Cc: Junio C Hamano <gitster@pobox.com>, git@vger.kernel.org
Subject: bw/transport-protocol-policy
Date: Thu, 1 Dec 2016 03:30:05 -0500 [thread overview]
Message-ID: <20161201083005.dui572o4jxsqacas@sigill.intra.peff.net> (raw)
In-Reply-To: <xmqqk2bngn03.fsf@gitster.mtv.corp.google.com>
On Mon, Nov 28, 2016 at 04:15:08PM -0800, Junio C Hamano wrote:
> * bw/transport-protocol-policy (2016-11-09) 2 commits
> (merged to 'next' on 2016-11-16 at 1391d3eeed)
> + transport: add protocol policy config option
> + lib-proto-disable: variable name fix
>
> Finer-grained control of what protocols are allowed for transports
> during clone/fetch/push have been enabled via a new configuration
> mechanism.
>
> Will cook in 'next'.
I was looking at the way the http code feeds protocol restrictions to
CURLOPT_REDIR_PROTOCOLS, and I think this topic is missing two elements:
1. The new policy config lets you say "only allow this protocol when
the user specifies it". But when http.c calls is_transport_allowed(),
the latter has no idea that we are asking it about potential
redirects (which obviously do _not_ come from the user), and would
erroneously allow them.
I think this needs fixed before the topic is merged. It's not a
regression, as it only comes into play if you use the new policy
config. But it is a minor security hole in the new feature.
2. If your curl is too old to support CURLOPT_REDIR_PROTOCOLS, we will
warn if there is a protocol whitelist in effect. But that check
only covers the environment whitelist, and we do not warn if you
restrict other protocols.
I actually think this should probably just warn indiscriminately.
Even without a Git protocol whitelist specified, the code serves to
prevent curl from redirecting to bizarre protocols like smtp. The
affected curl versions are from 2009 and prior, so I kind of doubt
it matters much either way (I'm actually tempted to suggest we bump
the minimum curl version there; there's a ton of #ifdef cruft going
back to 2002-era versions of libcurl).
-Peff
next prev parent reply other threads:[~2016-12-01 8:36 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-29 0:15 What's cooking in git.git (Nov 2016, #06; Mon, 28) Junio C Hamano
2016-11-29 1:05 ` Brandon Williams
2016-11-29 6:37 ` Jeff King
2016-11-29 6:51 ` Jeff King
2016-11-30 19:54 ` Brandon Williams
2016-11-30 23:28 ` Brandon Williams
2016-11-30 23:32 ` Jeff King
2016-11-30 23:40 ` Jeff King
2016-11-30 23:42 ` Brandon Williams
2016-11-30 23:46 ` Jeff King
2016-11-30 23:57 ` Brandon Williams
2016-11-30 23:59 ` Jeff King
2016-12-01 0:04 ` Jeff King
2016-12-01 0:08 ` Brandon Williams
2016-12-01 0:14 ` Stefan Beller
2016-12-01 1:14 ` Brandon Williams
2016-12-01 0:06 ` Brandon Williams
2016-12-01 0:19 ` Jeff King
2016-11-30 23:43 ` Stefan Beller
2016-12-01 7:09 ` Johannes Sixt
2016-12-01 7:19 ` Jeff King
2016-11-29 6:59 ` Jeff King
2016-11-29 18:31 ` Junio C Hamano
2016-11-29 18:37 ` Jeff King
2016-11-29 19:21 ` Stefan Beller
2016-11-29 19:26 ` Junio C Hamano
2016-11-29 19:29 ` Stefan Beller
2016-11-30 0:25 ` Stefan Beller
2016-12-01 8:30 ` Jeff King [this message]
2016-12-01 18:14 ` bw/transport-protocol-policy Brandon Williams
2016-12-01 19:20 ` bw/transport-protocol-policy Jeff King
2016-12-01 19:35 ` bw/transport-protocol-policy Brandon Williams
2016-12-01 19:46 ` bw/transport-protocol-policy Jeff King
2016-12-01 19:53 ` bw/transport-protocol-policy Brandon Williams
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