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Fixed a buffer overflow that could cause the daemon to crash. Bug found 

by Florian Westphal, <westphal@foo.fh-furtwangen.de>.
This commit is contained in:
Alexander Barton 2005-01-26 13:23:24 +00:00
parent 669da58715
commit 2440ed080c
2 changed files with 14 additions and 11 deletions
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4
ChangeLog
View File

@ -12,6 +12,8 @@
ngIRCd CVSHEAD
- Fixed a buffer overflow that could cause the daemon to crash. Bug found
by Florian Westphal, <westphal@foo.fh-furtwangen.de>.
- Fixed a possible buffer underrun when reading the MOTD file. Thanks
to Florian Westphal, <westphal@foo.fh-furtwangen.de>.
- Code cleanups from Florian Westphal, <westphal@foo.fh-furtwangen.de>.
@ -566,4 +568,4 @@ ngIRCd 0.0.1, 31.12.2001
--
$Id: ChangeLog,v 1.254 2005/01/24 14:17:21 alex Exp $
$Id: ChangeLog,v 1.255 2005/01/26 13:23:24 alex Exp $

21
src/ngircd/lists.c
View File

@ -1,6 +1,6 @@
/*
* ngIRCd -- The Next Generation IRC Daemon
* Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
* Copyright (c)2001-2005 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
@ -14,7 +14,7 @@
#include "portab.h"
static char UNUSED id[] = "$Id: lists.c,v 1.15 2004/04/25 15:40:19 alex Exp $";
static char UNUSED id[] = "$Id: lists.c,v 1.16 2005/01/26 13:23:24 alex Exp $";
#include "imp.h"
#include <assert.h>
@ -360,9 +360,10 @@ Lists_DeleteChannel( CHANNEL *Chan )
GLOBAL CHAR *
Lists_MakeMask( CHAR *Pattern )
{
/* Hier wird aus einem "beliebigen" Pattern eine gueltige IRC-Mask erzeugt.
* Diese ist aber nur bis zum naechsten Aufruf von Lists_MakeMask() gueltig,
* da ein einziger globaler Puffer verwendet wird. ->Umkopieren!*/
/* This function generats a valid IRC mask of "any" string. This
* mask is only valid until the next call to Lists_MakeMask(),
* because a single global buffer is used. You have to copy the
* generated mask to some sane location yourself! */
STATIC CHAR TheMask[MASK_LEN];
CHAR *excl, *at;
@ -376,7 +377,7 @@ Lists_MakeMask( CHAR *Pattern )
if(( ! at ) && ( ! excl ))
{
/* weder ! noch @ vorhanden: als Nick annehmen */
/* Neither "!" nor "@" found: use string as nick name */
strlcpy( TheMask, Pattern, sizeof( TheMask ) - 5 );
strlcat( TheMask, "!*@*", sizeof( TheMask ));
return TheMask;
@ -384,7 +385,7 @@ Lists_MakeMask( CHAR *Pattern )
if(( ! at ) && ( excl ))
{
/* Domain fehlt */
/* Domain part is missing */
strlcpy( TheMask, Pattern, sizeof( TheMask ) - 3 );
strlcat( TheMask, "@*", sizeof( TheMask ));
return TheMask;
@ -392,15 +393,15 @@ Lists_MakeMask( CHAR *Pattern )
if(( at ) && ( ! excl ))
{
/* User fehlt */
/* User name is missing */
*at = '\0'; at++;
strlcpy( TheMask, Pattern, sizeof( TheMask ) - strlen( at ) - 4 );
strlcpy( TheMask, Pattern, sizeof( TheMask ) - 5 );
strlcat( TheMask, "!*@", sizeof( TheMask ));
strlcat( TheMask, at, sizeof( TheMask ));
return TheMask;
}
/* alle Teile vorhanden */
/* All parts (nick, user and domain name) are given */
strlcpy( TheMask, Pattern, sizeof( TheMask ));
return TheMask;
} /* Lists_MakeMask */