commit 8644cbf197807909e4caea184278872cdeca1963
from: Alexander Barton <alex@barton.de>
date: Fri May 30 12:58:25 2008 UTC

Don't allow stray \r or \n in command parameters

If ngircd receives an input line like "COMMAND arg\nIRRELEVANT\r\n",
"arg\nIRRELEVANT" is passed as an argument to COMMAND. This can lead
to output like:

:ngircd.test.server 322 nick #chan 1 :
topicwithprecedingnewline
:ngircd.test.server 322 nick #nxtchan 1 :
[..]

Worse, this allows clients to piggyback irc commands, e.g.
"TOPIC #a :test\n:fake!~a@nonexistant JOIN :#a\r\n", which
causes the client to receive a JOIN command during /LIST output.

Bug reported by Scott Perry, first patch by Florian Westphal.

commit - 4c121f277da634d62a382457eb1df354cfb77b9b
commit + 8644cbf197807909e4caea184278872cdeca1963
blob - ef2dbbba0bc6d874f886e6a311bef9a233887d6d
blob + 00ae3cd7e93d5f415a596d3d4c6b50ffb27c7817
--- src/ngircd/parse.c
+++ src/ngircd/parse.c
@@ -1,6 +1,6 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2008 Alexander Barton (alex@barton.de)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -8,12 +8,9 @@
  * (at your option) any later version.
  * Please read the file COPYING, README and AUTHORS for more information.
  */
-
 
 #include "portab.h"
 
-static char UNUSED id[] = "$Id: parse.c,v 1.72 2008/02/17 13:26:42 alex Exp $";
-
 /**
  * @file
  * IRC command parser and validator.
@@ -341,12 +338,25 @@ Validate_Command( UNUSED CONN_ID Idx, UNUSED REQUEST *
 
 
 static bool
-Validate_Args( UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *Closed )
+Validate_Args(CONN_ID Idx, REQUEST *Req, bool *Closed)
 {
+	int i;
+
 	assert( Idx >= 0 );
 	assert( Req != NULL );
 	*Closed = false;
 
+	for (i = 0; i < Req->argc; i++) {
+		if (strchr(Req->argv[i], '\r') || strchr(Req->argv[i], '\n')) {
+			Log(LOG_ERR,
+			    "Invalid character(s) in parameter (connection %d, command %s)!?",
+			    Idx, Req->command);
+			if (!Conn_WriteStr(Idx,
+					   "ERROR :Invalid character(s) in parameter!"))
+				*Closed = true;
+			return false;
+		}
+	}
 	return true;
 } /* Validate_Args */