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When hostname len > 8, name replaced with dot notation when -u flag

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not specified (default case).
Use _PATH_* for utmp/wtmp.

Support for >32 PTYs.
>Submitted by:   Heikki Suonsivu <hsu@cs.hut.fi>

Plug already known security hole. (Brought over from 1.1.5):
Fixed security problem with telnetd, which allowed
   telnet -l -hcert.org localhost
to change the user's host in utmp.
Thanks to Matthew Green <mrgreen@@mame.mu.oz.au> for showing me this one.

>Reviewed by:    karl, guido
>Submitted by:   mrgreen@mame.mu.oz.au

Obtained from:	FreeBSD insecure telnetd
This commit is contained in:
Paul Traina 1995-07-20 12:35:01 +00:00
parent 4fd39f708a
commit 4a0834a5a2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=9592
2 changed files with 38 additions and 14 deletions
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26
eBones/libexec/telnetd/sys_term.c
View File

@ -46,9 +46,9 @@ static char sccsid[] = "@(#)sys_term.c 8.4 (Berkeley) 5/30/95";
# define PARENT_DOES_UTMP
#endif
int utmp_len = MAXHOSTNAMELEN;
#ifdef NEWINIT
#include <initreq.h>
int utmp_len = MAXHOSTNAMELEN; /* sizeof(init_request.host) */
#else /* NEWINIT*/
# ifdef UTMPX
# include <utmpx.h>
@ -58,10 +58,17 @@ struct utmpx wtmp;
struct utmp wtmp;
# endif /* UTMPX */
int utmp_len = sizeof(wtmp.ut_host);
# ifndef PARENT_DOES_UTMP
#ifdef _PATH_WTMP
char wtmpf[] = _PATH_WTMP;
#else
char wtmpf[] = "/usr/adm/wtmp";
#endif
#ifdef _PATH_UTMP
char utmpf[] = _PATH_UTMP;
#else
char utmpf[] = "/etc/utmp";
#endif
# else /* PARENT_DOES_UTMP */
char wtmpf[] = "/etc/wtmp";
# endif /* PARENT_DOES_UTMP */
@ -504,7 +511,7 @@ int *ptynum;
p2 = &line[14];
#endif
for (cp = "pqrstuvwxyzPQRST"; *cp; cp++) {
for (cp = "pqrsPQRS"; *cp; cp++) {
struct stat stb;
*p1 = *cp;
@ -516,8 +523,8 @@ int *ptynum;
*/
if (stat(line, &stb) < 0)
break;
for (i = 0; i < 16; i++) {
*p2 = "0123456789abcdef"[i];
for (i = 0; i < 32; i++) {
*p2 = "0123456789abcdefghijklmnopqrstuv"[i];
p = open(line, 2);
if (p > 0) {
#ifndef __hpux
@ -1544,7 +1551,7 @@ start_login(host, autologin, name)
{
register char *cp;
register char **argv;
char **addarg();
char **addarg(), *user;
extern char *getenv();
#ifdef UTMPX
register int pid = getpid();
@ -1727,7 +1734,12 @@ start_login(host, autologin, name)
# endif
} else
#endif
if (getenv("USER")) {
if (user = getenv("USER")) {
if (strchr(user, '-')) {
syslog(LOG_ERR, "tried to pass user \"%s\" to login",
user);
fatal(net, "invalid user");
}
argv = addarg(argv, getenv("USER"));
#if defined(LOGIN_ARGS) && defined(NO_LOGIN_P)
{

26
secure/libexec/telnetd/sys_term.c
View File

@ -46,9 +46,9 @@ static char sccsid[] = "@(#)sys_term.c 8.4 (Berkeley) 5/30/95";
# define PARENT_DOES_UTMP
#endif
int utmp_len = MAXHOSTNAMELEN;
#ifdef NEWINIT
#include <initreq.h>
int utmp_len = MAXHOSTNAMELEN; /* sizeof(init_request.host) */
#else /* NEWINIT*/
# ifdef UTMPX
# include <utmpx.h>
@ -58,10 +58,17 @@ struct utmpx wtmp;
struct utmp wtmp;
# endif /* UTMPX */
int utmp_len = sizeof(wtmp.ut_host);
# ifndef PARENT_DOES_UTMP
#ifdef _PATH_WTMP
char wtmpf[] = _PATH_WTMP;
#else
char wtmpf[] = "/usr/adm/wtmp";
#endif
#ifdef _PATH_UTMP
char utmpf[] = _PATH_UTMP;
#else
char utmpf[] = "/etc/utmp";
#endif
# else /* PARENT_DOES_UTMP */
char wtmpf[] = "/etc/wtmp";
# endif /* PARENT_DOES_UTMP */
@ -504,7 +511,7 @@ int *ptynum;
p2 = &line[14];
#endif
for (cp = "pqrstuvwxyzPQRST"; *cp; cp++) {
for (cp = "pqrsPQRS"; *cp; cp++) {
struct stat stb;
*p1 = *cp;
@ -516,8 +523,8 @@ int *ptynum;
*/
if (stat(line, &stb) < 0)
break;
for (i = 0; i < 16; i++) {
*p2 = "0123456789abcdef"[i];
for (i = 0; i < 32; i++) {
*p2 = "0123456789abcdefghijklmnopqrstuv"[i];
p = open(line, 2);
if (p > 0) {
#ifndef __hpux
@ -1544,7 +1551,7 @@ start_login(host, autologin, name)
{
register char *cp;
register char **argv;
char **addarg();
char **addarg(), *user;
extern char *getenv();
#ifdef UTMPX
register int pid = getpid();
@ -1727,7 +1734,12 @@ start_login(host, autologin, name)
# endif
} else
#endif
if (getenv("USER")) {
if (user = getenv("USER")) {
if (strchr(user, '-')) {
syslog(LOG_ERR, "tried to pass user \"%s\" to login",
user);
fatal(net, "invalid user");
}
argv = addarg(argv, getenv("USER"));
#if defined(LOGIN_ARGS) && defined(NO_LOGIN_P)
{