From 5ccc1d34107c59823d859fe77c1b404b817de194 Mon Sep 17 00:00:00 2001
From: Matthew Wild <mwild1@gmail.com>
Date: Mon, 5 Mar 2012 11:07:10 +0000
Subject: mod_s2s: streamopened(): Tighter validation around stream 'to' and
'from' attributes, and only set to_host and from_host if they aren't set
already and if the session hasn't already been authenticated
---
plugins/s2s/mod_s2s.lua | 30 +++++++++++++++++++++++++++---
1 file changed, 27 insertions(+), 3 deletions(-)
(limited to 'plugins')
diff --git a/plugins/s2s/mod_s2s.lua b/plugins/s2s/mod_s2s.lua
index 407a7e04..fcdd9dd6 100644
--- a/plugins/s2s/mod_s2s.lua
+++ b/plugins/s2s/mod_s2s.lua
@@ -168,9 +168,33 @@ function stream_callbacks.streamopened(session, attr)
if session.direction == "incoming" then
-- Send a reply stream header
- session.to_host = attr.to and nameprep(attr.to);
- session.from_host = attr.from and nameprep(attr.from);
-
+
+ -- Validate to/from
+ local to, from = nameprep(attr.to), nameprep(attr.from);
+ if not to and attr.to then -- COMPAT: Some servers do not reliably set 'to' (especially on stream restarts)
+ session:close({ condition = "improper-addressing", text = "Invalid 'to' address" });
+ return;
+ end
+ if not from and attr.from then -- COMPAT: Some servers do not reliably set 'from' (especially on stream restarts)
+ session:close({ condition = "improper-addressing", text = "Invalid 'from' address" });
+ return;
+ end
+
+ -- Set session.[from/to]_host if they have not been set already and if
+ -- this session isn't already authenticated
+ if session.type == "s2sin_unauthed" and from and not session.from_host then
+ session.from_host = from;
+ elseif from ~= session.from_host then
+ session:close({ condition = "improper-addressing", text = "New stream 'from' attribute does not match original" });
+ return;
+ end
+ if session.type == "s2sin_unauthed" and to and not session.to_host then
+ session.to_host = to;
+ elseif to ~= session.to_host then
+ session:close({ condition = "improper-addressing", text = "New stream 'to' attribute does not match original" });
+ return;
+ end
+
session.streamid = uuid_gen();
(session.log or log)("debug", "Incoming s2s received <stream:stream>");
if session.to_host then
--
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