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Buffer overflow and environment passing fixes [originally inspired from 

FreeBSD]. We really didn't need the environment fixes, but for the sake
of keeping the code as close as possible...
This commit is contained in:
christos 2000-11-19 20:17:39 +00:00
parent 2a0dca4bec
commit 5135a422f1
3 changed files with 32 additions and 16 deletions
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7
libexec/telnetd/defs.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: defs.h,v 1.7 1998/04/01 15:05:10 kleink Exp $ */
/* $NetBSD: defs.h,v 1.8 2000/11/19 20:17:39 christos Exp $ */
/*
* Copyright (c) 1989, 1993
@ -298,3 +298,8 @@ typedef struct {
#define his_will_wont_is_changing my_do_dont_is_changing
#define his_do_dont_is_changing my_will_wont_is_changing
/*
* Initialization buffer for tty device [16 characters long]
*/
#define NULL16STR "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"

32
libexec/telnetd/sys_term.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: sys_term.c,v 1.18 1999/12/31 12:42:35 tron Exp $ */
/* $NetBSD: sys_term.c,v 1.19 2000/11/19 20:17:39 christos Exp $ */
/*
* Copyright (c) 1989, 1993
@ -38,7 +38,7 @@
#if 0
static char sccsid[] = "@(#)sys_term.c 8.4+1 (Berkeley) 5/30/95";
#else
__RCSID("$NetBSD: sys_term.c,v 1.18 1999/12/31 12:42:35 tron Exp $");
__RCSID("$NetBSD: sys_term.c,v 1.19 2000/11/19 20:17:39 christos Exp $");
#endif
#endif /* not lint */
@ -482,13 +482,13 @@ getnpty()
* Returns the file descriptor of the opened pty.
*/
#ifndef __GNUC__
char *line = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
char *line = NULL16STR;
#else
static char Xline[] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
static char Xline[] = NULL16STR;
char *line = Xline;
#endif
#ifdef CRAY
char *myline = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
char *myline = NULL16STR;
#endif /* CRAY */
#ifdef OPENPTY_PTY
@ -522,7 +522,7 @@ int *ptynum;
if (p > 0) {
grantpt(p);
unlockpt(p);
strcpy(line, ptsname(p));
(void)strlcpy(line, ptsname(p), sizeof(NULL16STR));
return(p);
}
@ -1601,7 +1601,7 @@ start_login(host, autologin, name)
#endif
#ifdef SOLARIS
char *term;
char termbuf[64];
char termnamebuf[64];
#endif
#ifdef UTMPX
@ -1655,9 +1655,10 @@ start_login(host, autologin, name)
if (term == NULL || term[0] == 0) {
term = "-";
} else {
strcpy(termbuf, "TERM=");
strncat(termbuf, term, sizeof(termbuf) - 6);
term = termbuf;
(void)strcpy(termnamebuf, "TERM=");
(void)strlcpy(&termnamebuf[5], term,
sizeof(termnamebuf) - 6);
term = termnamebuf;
}
argv = addarg(argv, term);
#endif
@ -1893,6 +1894,17 @@ scrub_env()
if (strncmp(*cpp, "LD_", 3) &&
strncmp(*cpp, "_RLD_", 5) &&
strncmp(*cpp, "LIBPATH=", 8) &&
strncmp(*cpp, "LOCALDOMAIN=", 12) &&
strncmp(*cpp, "RES_OPTIONS=", 12) &&
strncmp(*cpp, "TERMINFO=", 9) &&
strncmp(*cpp, "TERMINFO_DIRS=", 14) &&
/*
* We dissallow TERMPATH and TERMCAP
* entries that reference files.
*/
strncmp(*cpp, "TERMPATH=", 9) &&
strncmp(*cpp, "TERMCAP=/", 9) &&
strncmp(*cpp, "ENV=", 4) &&
strncmp(*cpp, "IFS=", 4))
*cpp2++ = *cpp;
}

9
libexec/telnetd/telnetd.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: telnetd.c,v 1.22 2000/08/18 03:25:52 itojun Exp $ */
/* $NetBSD: telnetd.c,v 1.23 2000/11/19 20:17:39 christos Exp $ */
/*
* Copyright (C) 1997 and 1998 WIDE Project.
@ -69,7 +69,7 @@ __COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\
#if 0
static char sccsid[] = "@(#)telnetd.c 8.4 (Berkeley) 5/30/95";
#else
__RCSID("$NetBSD: telnetd.c,v 1.22 2000/08/18 03:25:52 itojun Exp $");
__RCSID("$NetBSD: telnetd.c,v 1.23 2000/11/19 20:17:39 christos Exp $");
#endif
#endif /* not lint */
@ -922,13 +922,12 @@ doit(who)
#else
for (;;) {
char *lp;
extern char *line;
if ((lp = getpty()) == NULL)
fatal(net, "Out of ptys");
if ((pty = open(lp, 2)) >= 0) {
strcpy(line,lp);
(void)strlcpy(line, lp, sizeof(NULL16STR));
line[5] = 't';
break;
}
@ -1239,7 +1238,7 @@ telnet(f, p, host)
IM = getstr("im", &cp);
IF = getstr("if", &cp);
if (HN && *HN)
(void) strcpy(host_name, HN);
(void)strlcpy(host_name, HN, sizeof(host_name));
if (IM == 0)
IM = "";
} else {