* Copyright (c) 1988, 1989 The Regents of the University of California.
* All rights reserved.
*
- * %sccs.include.redist.c%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
*/
#ifndef lint
#endif /* not lint */
#ifndef lint
-static char sccsid[] = "@(#)rshd.c 5.38 (Berkeley) %G%";
+static char sccsid[] = "@(#)rshd.c 5.38.1.1 (Berkeley) 8/20/91";
#endif /* not lint */
/*
#include <pwd.h>
#include <syslog.h>
-#include "pathnames.h"
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
int keepalive = 1;
int check_all = 0;
-int check_all = 0;
char *index(), *rindex(), *strncat();
/*VARARGS1*/
int error();
int sent_null;
-int sent_null;
+
+#ifdef KERBEROS
+#include <kerberosIV/des.h>
+#include <kerberosIV/krb.h>
+#define VERSION_SIZE 9
+#define SECURE_MESSAGE "This rsh session is using DES encryption for all transmissions.\r\n"
+#define OPTIONS "alknvx"
+char authbuf[sizeof(AUTH_DAT)];
+char tickbuf[sizeof(KTEXT_ST)];
+int doencrypt, use_kerberos, vacuous;
+Key_schedule schedule;
+#else
+#define OPTIONS "aln"
+#endif
/*ARGSUSED*/
main(argc, argv)
openlog("rshd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
opterr = 0;
+ while ((ch = getopt(argc, argv, OPTIONS)) != EOF)
switch (ch) {
case 'a':
check_all = 1;
case 'n':
keepalive = 0;
break;
+#ifdef KERBEROS
+ case 'k':
+ use_kerberos = 1;
+ break;
+
+ case 'v':
+ vacuous = 1;
+ break;
+
+#endif
case '?':
default:
usage();
argc -= optind;
argv += optind;
+#ifdef KERBEROS
+ if (use_kerberos && vacuous) {
+ syslog(LOG_ERR, "only one of -k and -v allowed");
+ exit(2);
+ }
+#endif
+
fromlen = sizeof (from);
if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
syslog(LOG_ERR, "getpeername: %m");
int one = 1;
char remotehost[2 * MAXHOSTNAMELEN + 1];
+#ifdef KERBEROS
+ AUTH_DAT *kdata = (AUTH_DAT *) NULL;
+ KTEXT ticket = (KTEXT) NULL;
+ char instance[INST_SZ], version[VERSION_SIZE];
+ struct sockaddr_in fromaddr;
+ int rc;
+ long authopts;
+ int pv1[2], pv2[2];
+ fd_set wready, writeto;
+
+ fromaddr = *fromp;
+#endif
+
(void) signal(SIGINT, SIG_DFL);
(void) signal(SIGQUIT, SIG_DFL);
(void) signal(SIGTERM, SIG_DFL);
fromp->sin_family);
exit(1);
}
-#ifdef IP_OPTIONS
- {
- u_char optbuf[BUFSIZ/3], *cp;
- char lbuf[BUFSIZ], *lp;
- int optsize = sizeof(optbuf), ipproto;
- struct protoent *ip;
#ifdef IP_OPTIONS
{
u_char optbuf[BUFSIZ/3], *cp;
int optsize = sizeof(optbuf), ipproto;
struct protoent *ip;
- if ((ip = getprotobyname("ip")) != NULL)
- ipproto = ip->p_proto;
- else
- ipproto = IPPROTO_IP;
- if (getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf, &optsize) == 0 &&
- optsize != 0) {
- lp = lbuf;
- for (cp = optbuf; optsize > 0; cp++, optsize--, lp += 3)
- sprintf(lp, " %2.2x", *cp);
- syslog(LOG_NOTICE,
- "Connection received using IP options (ignored):%s", lbuf);
- if (setsockopt(0, ipproto, IP_OPTIONS,
- (char *)NULL, &optsize) != 0) {
- syslog(LOG_ERR, "setsockopt IP_OPTIONS NULL: %m");
- exit(1);
- }
- }
- }
-#endif
-
if ((ip = getprotobyname("ip")) != NULL)
ipproto = ip->p_proto;
else
#ifdef KERBEROS
if (!use_kerberos)
+#endif
+ if (fromp->sin_port >= IPPORT_RESERVED ||
+ fromp->sin_port < IPPORT_RESERVED/2) {
+ syslog(LOG_NOTICE|LOG_AUTH,
+ "Connection from %s on illegal port",
+ inet_ntoa(fromp->sin_addr));
+ exit(1);
+ }
(void) alarm(60);
port = 0;
shutdown(0, 1+1);
exit(1);
}
+ if (c== 0)
+ break;
port = port * 10 + c - '0';
}
}
#ifdef KERBEROS
if (!use_kerberos)
+#endif
+ if (port >= IPPORT_RESERVED) {
+ syslog(LOG_ERR, "2nd port not reserved\n");
+ exit(1);
+ }
fromp->sin_port = htons(port);
if (connect(s, (struct sockaddr *)fromp, sizeof (*fromp)) < 0) {
syslog(LOG_INFO, "connect second port: %m");
}
}
+#ifdef KERBEROS
+ if (vacuous) {
+ error("rshd: remote host requires Kerberos authentication\n");
+ exit(1);
+ }
+#endif
+
#ifdef notdef
/* from inetd, socket is already on 0, 1, 2 */
dup2(f, 0);
errorstr =
"Couldn't look up address for your host (%s)\n";
hostname = inet_ntoa(fromp->sin_addr);
- }
-#ifdef h_addr /* 4.2 hack */
- for (; ; hp->h_addr_list++) {
+ } else for (; ; hp->h_addr_list++) {
if (hp->h_addr_list[0] == NULL) {
syslog(LOG_NOTICE,
"Host addr %s not listed for host %s",
break;
}
}
-#else
- if (bcmp(hp->h_addr, (caddr_t)&fromp->sin_addr,
- sizeof(fromp->sin_addr))) {
- syslog(LOG_NOTICE,
- "Host addr %s not listed for host %s",
- inet_ntoa(fromp->sin_addr),
- hp->h_name);
- error("Host address mismatch\n");
- exit(1);
- }
-#endif
}
} else
errorhost = hostname = inet_ntoa(fromp->sin_addr);
- getstr(remuser, sizeof(remuser), "remuser");
+#ifdef KERBEROS
+ if (use_kerberos) {
+ kdata = (AUTH_DAT *) authbuf;
+ ticket = (KTEXT) tickbuf;
+ authopts = 0L;
+ strcpy(instance, "*");
+ version[VERSION_SIZE - 1] = '\0';
+ rc = krb_recvauth(authopts, 0, ticket, "rcmd",
+ instance, &fromaddr,
+ (struct sockaddr_in *) 0,
+ kdata, "", (bit_64 *) 0, version);
+ if (rc != KSUCCESS) {
+ error("Kerberos authentication failure: %s\n",
+ krb_err_txt[rc]);
+ exit(1);
+ }
+ } else
+#endif
+ getstr(remuser, sizeof(remuser), "remuser");
+
getstr(locuser, sizeof(locuser), "locuser");
getstr(cmdbuf, sizeof(cmdbuf), "command");
setpwent();
#endif
}
- if (pwd->pw_passwd != 0 && *pwd->pw_passwd != '\0' &&
- ruserok(hostname, pwd->pw_uid == 0, remuser, locuser) < 0) {
- error("Permission denied.\n");
- exit(1);
- }
+#ifdef KERBEROS
+ if (use_kerberos) {
+ if (pwd->pw_passwd != 0 && *pwd->pw_passwd != '\0') {
+ if (kuserok(kdata, locuser) != 0) {
+ syslog(LOG_NOTICE|LOG_AUTH,
+ "Kerberos rsh denied to %s.%s@%s",
+ kdata->pname, kdata->pinst, kdata->prealm);
+ error("Permission denied.\n");
+ exit(1);
+ }
+ }
+ } else
+#endif
+
+ if (errorstr ||
+ pwd->pw_passwd != 0 && *pwd->pw_passwd != '\0' &&
+ ruserok(hostname, pwd->pw_uid == 0, remuser, locuser) < 0) {
+fail:
+ if (errorstr == NULL)
+ errorstr = "Permission denied.\n";
+ error(errorstr, errorhost);
+ exit(1);
+ }
if (pwd->pw_uid && !access(_PATH_NOLOGIN, F_OK)) {
error("Logins currently disabled.\n");
(void) write(2, "\0", 1);
sent_null = 1;
- sent_null = 1;
if (port) {
if (pipe(pv) < 0) {
(void) close(s); (void) close(pv[0]);
dup2(pv[1], 2);
close(pv[1]);
- close(pv[1]);
}
if (*pwd->pw_shell == '\0')
pwd->pw_shell = _PATH_BSHELL;
else
cp = pwd->pw_shell;
endpwent();
- if (pwd->pw_uid == 0)
- syslog(LOG_INFO|LOG_AUTH, "ROOT shell from %s@%s, comm: %s\n",
- remuser, hostname, cmdbuf);
- endpwent();
if (pwd->pw_uid == 0) {
#ifdef KERBEROS
if (use_kerberos)
exit(1);
}
-/*
- * Report error to client.
- * Note: can't be used until second socket has connected
- * to client, or older clients will hang waiting
- * for that connection first.
- */
/*
* Report error to client.
* Note: can't be used until second socket has connected
char localhost[MAXHOSTNAMELEN];
char *p1, *p2, *topdomain();
- localhost[0] = 0;
localhost[0] = 0;
(void) gethostname(localhost, sizeof(localhost));
p1 = topdomain(localhost);
return (maybe);
}
-char *
-topdomain(h)
- char *h;
-{
- register char *p;
- char *maybe = NULL;
- int dots = 0;
-
- for (p = h + strlen(h); p >= h; p--) {
- if (*p == '.') {
- if (++dots == 2)
- return (p);
- maybe = p;
- }
- }
- return (maybe);
-}
-
usage()
{
syslog(LOG_ERR, "usage: rshd [-%s]", OPTIONS);