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Quite a while back KTH (who are the good folks who wrote our KerberosIV)

Browse Source 
announced a K4 weakness with their rsh/rlogins. We were not put in any
danger by this, as we were not using KTH rlogin/rsh, but the patches
in themselves, had some good points. This lot means we can run our
rlogin without it being SUID root. Win win win. There are other KTH
cleanups as well.
This commit is contained in:
Mark Murray 1998-03-26 18:03:41 +00:00
parent 17515961ec
commit 42873e5755
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=34897
2 changed files with 20 additions and 18 deletions
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6
usr.bin/rlogin/Makefile
View File

@ -4,9 +4,9 @@ PROG= rlogin
SRCS= rlogin.c
CFLAGS+=-Wall
BINOWN= root
BINMODE=4555
INSTALLFLAGS=-fschg
#BINOWN= root
#BINMODE=4555
#INSTALLFLAGS=-fschg
.if exists(${DESTDIR}/usr/lib/libkrb.a) && defined(MAKE_KERBEROS4)
SRCS+= krcmd.c kcmd.c rcmd_util.c encrypt.c

32
usr.bin/rlogin/rlogin.c
View File

@ -40,7 +40,7 @@ static const char copyright[] =
#ifndef lint
static const char sccsid[] = "@(#)rlogin.c 8.1 (Berkeley) 6/6/93";
static const char rcsid[] =
"$Id: rlogin.c,v 1.15 1997/08/05 06:46:46 charnier Exp $";
"$Id$";
#endif /* not lint */
/*
@ -75,6 +75,7 @@ static const char rcsid[] =
#include <des.h>
#include <krb.h>
#include "../../bin/rcp/pathnames.h"
#include "krb.h"
CREDENTIALS cred;
@ -220,14 +221,12 @@ main(argc, argv)
usage();
}
optind += argoff;
argc -= optind;
argv += optind;
/* if haven't gotten a host yet, do so */
if (!host && !(host = *argv++))
if (!host && !(host = argv[optind++]))
usage();
if (*argv)
if (argv[optind])
usage();
if (!(pw = getpwuid(uid = getuid())))
@ -276,15 +275,8 @@ main(argc, argv)
(void)signal(SIGUSR1, writeroob);
#ifdef KERBEROS
try_connect:
if (use_kerberos) {
struct hostent *hp;
/* Fully qualify hostname (needed for krb_realmofhost). */
hp = gethostbyname(host);
if (hp != NULL && !(host = strdup(hp->h_name)))
errx(1, "%s", strerror(ENOMEM));
setuid(getuid());
rem = KSUCCESS;
errno = 0;
if (dest_realm == NULL)
@ -300,7 +292,9 @@ main(argc, argv)
rem = krcmd(&host, sp->s_port, user, term, 0,
dest_realm);
if (rem < 0) {
use_kerberos = 0;
int i;
char **newargv;
sp = getservbyname("login", "tcp");
if (sp == NULL)
errx(1, "unknown service login/tcp");
@ -308,7 +302,15 @@ main(argc, argv)
warn("remote host doesn't support Kerberos");
if (errno == ENOENT)
warn("can't provide Kerberos auth data");
goto try_connect;
newargv = malloc((argc + 2) * sizeof(*newargv));
if (newargv == NULL)
err(1, "malloc");
newargv[0] = argv[0];
newargv[1] = "-K";
for(i = 1; i < argc; ++i)
newargv[i + 1] = argv[i];
newargv[argc + 1] = NULL;
execv(_PATH_RLOGIN, newargv);
}
} else {
#ifdef CRYPT