commit f543cf5836c24dcba175e353f7ef4d3b82d2c77d Author: Nick Mathewson nickm@torproject.org Date: Fri Feb 28 12:04:54 2014 -0500

Add some questions to proposal 229 --- proposals/229-further-socks5-extensions.txt | 33 +++++++++++++++++++++++---- 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/proposals/229-further-socks5-extensions.txt b/proposals/229-further-socks5-extensions.txt index 400712c..c0a6762 100644 --- a/proposals/229-further-socks5-extensions.txt +++ b/proposals/229-further-socks5-extensions.txt @@ -114,6 +114,9 @@ Status: Draft If a server sends a response indicating failure (STATUS value other than X'00') it MUST close the connection.

+ [XXXX What should a client if it gets a value here it does + not recognize?] + NR PAIRS, KLEN, KEY, VLEN, VALUE:

These fields have the same format as they do in Extended @@ -125,7 +128,23 @@ Status: Draft * "USERNAME" The username for authentication. * "PASSWD" The password for authentication.

- [XXX - Add some more here, Stream isolation?] + [XXXX What do these do? What is their behavior? Are they + client-only? Right now, Tor uses SOCKS5 usernames and + passwords in two ways: + + 1) as a way to control isolation, when receiving them + from a SOCKS client. + 2) as a way to encode arbitrary data, when sending data + to a PT. + + Neither of these seem necessary any more. We can turn 1 into + a new KEY, and we can turn 2 into a new set of keys. -NM] + + [XXX - Add some more here, Stream isolation? -YA] + + [XXXX What should a client if it gets a value here it does + not recognize? -NM] +

2.2. Tor Extended SOCKS5 Reply Codes

@@ -136,6 +155,9 @@ Status: Draft Authentication" as part of the version identifier/method selection SOCKS5 message.

+ [Actually, should this perhaps be controlled by additional KEY? + (I'm not sure.) -NM] + Where:

* X'E0' Hidden Service Not Found @@ -190,9 +212,10 @@ Status: Draft

Identical security considerations to RFC 1929 Username/Password authentication applies when doing Username/Password - authentication using the keys reserved for such. As the - USERNAME/PASSWD fields are carried in cleartext, this authentication - method MUST NOT be used in scenarios where sniffing is possible. + authentication using the keys reserved for such. As SOCKS5 is + sent in cleartext, this extension (like the rest of the SOCKS5 + protocol) MUST NOT be used in scenarios where sniffing is possible. + The authors of this proposal note that binding any of the Tor (and associated) SOCKS5 servers to non-loopback interfaces is strongly discouraged currently, so in the current model this is @@ -211,7 +234,7 @@ Status: Draft Appelbaum, J., Mathewson, N., "Pluggable Transport Specification", June 2012.

-[XXX - Changelog (Remove when accepted)] +[XXX - Changelog (Remove when accepted) -YA]

2014-02-28 (Thanks to nickm/arma) * Generalize to also support tor