777 lines
17 KiB
C
777 lines
17 KiB
C
/*-
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* Copyright (c) 1983, 1988, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: rlogind.c,v 1.16 1997/03/24 06:01:39 imp Exp $
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1983, 1988, 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)rlogind.c 8.1 (Berkeley) 6/4/93";
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#endif /* not lint */
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/*
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* remote login server:
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* \0
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* remuser\0
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* locuser\0
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* terminal_type/speed\0
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* data
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*/
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#define FD_SETSIZE 16 /* don't need many bits for select */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <signal.h>
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#include <termios.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <syslog.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include "pathnames.h"
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#ifndef TIOCPKT_WINDOW
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#define TIOCPKT_WINDOW 0x80
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#endif
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#ifdef KERBEROS
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#include <des.h>
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#include <kerberosIV/krb.h>
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#define SECURE_MESSAGE "This rlogin session is using DES encryption for all transmissions.\r\n"
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AUTH_DAT *kdata;
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KTEXT ticket;
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u_char auth_buf[sizeof(AUTH_DAT)];
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u_char tick_buf[sizeof(KTEXT_ST)];
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Key_schedule schedule;
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int doencrypt, retval, use_kerberos, vacuous;
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#define ARGSTR "Dalnkvx"
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#else
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#define ARGSTR "Daln"
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#endif /* KERBEROS */
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char *env[2];
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#define NMAX 30
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char lusername[NMAX+1], rusername[NMAX+1];
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static char term[64] = "TERM=";
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#define ENVSIZE (sizeof("TERM=")-1) /* skip null for concatenation */
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int keepalive = 1;
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int check_all = 0;
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int no_delay;
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struct passwd *pwd;
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void doit __P((int, struct sockaddr_in *));
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int control __P((int, char *, int));
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void protocol __P((int, int));
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void cleanup __P((int));
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void fatal __P((int, char *, int));
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int do_rlogin __P((struct sockaddr_in *));
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void getstr __P((char *, int, char *));
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void setup_term __P((int));
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int do_krb_login __P((struct sockaddr_in *));
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void usage __P((void));
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int local_domain __P((char *));
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char *topdomain __P((char *));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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extern int __check_rhosts_file;
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struct sockaddr_in from;
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int ch, fromlen, on;
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openlog("rlogind", LOG_PID | LOG_CONS, LOG_AUTH);
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opterr = 0;
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while ((ch = getopt(argc, argv, ARGSTR)) != -1)
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switch (ch) {
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case 'D':
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no_delay = 1;
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break;
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case 'a':
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check_all = 1;
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break;
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case 'l':
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__check_rhosts_file = 0;
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break;
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case 'n':
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keepalive = 0;
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break;
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#ifdef KERBEROS
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case 'k':
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use_kerberos = 1;
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break;
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case 'v':
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vacuous = 1;
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break;
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#ifdef CRYPT
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case 'x':
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doencrypt = 1;
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break;
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#endif
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#endif
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case '?':
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default:
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usage();
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break;
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}
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argc -= optind;
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argv += optind;
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#ifdef KERBEROS
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if (use_kerberos && vacuous) {
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usage();
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fatal(STDERR_FILENO, "only one of -k and -v allowed", 0);
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}
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#endif
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fromlen = sizeof (from);
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if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
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syslog(LOG_ERR,"Can't get peer name of remote host: %m");
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fatal(STDERR_FILENO, "Can't get peer name of remote host", 1);
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}
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on = 1;
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if (keepalive &&
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setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0)
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syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
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if (no_delay &&
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setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
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syslog(LOG_WARNING, "setsockopt (TCP_NODELAY): %m");
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on = IPTOS_LOWDELAY;
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if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
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syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
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doit(0, &from);
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}
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int child;
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int netf;
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char line[MAXPATHLEN];
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int confirmed;
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struct winsize win = { 0, 0, 0, 0 };
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void
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doit(f, fromp)
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int f;
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struct sockaddr_in *fromp;
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{
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int master, pid, on = 1;
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int authenticated = 0;
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register struct hostent *hp;
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char hostname[2 * MAXHOSTNAMELEN + 1];
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char c;
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alarm(60);
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read(f, &c, 1);
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if (c != 0)
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exit(1);
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#ifdef KERBEROS
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if (vacuous)
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fatal(f, "Remote host requires Kerberos authentication", 0);
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#endif
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alarm(0);
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fromp->sin_port = ntohs((u_short)fromp->sin_port);
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hp = gethostbyaddr((char *)&fromp->sin_addr, sizeof(struct in_addr),
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fromp->sin_family);
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if (hp) {
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(void)strncpy(hostname, hp->h_name, sizeof(hostname));
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} else {
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(void)strncpy(hostname, inet_ntoa(fromp->sin_addr), sizeof(hostname));
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}
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hostname[sizeof(hostname) - 1] = '\0';
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#ifdef KERBEROS
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if (use_kerberos) {
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retval = do_krb_login(fromp);
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if (retval == 0)
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authenticated++;
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else if (retval > 0)
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fatal(f, krb_err_txt[retval], 0);
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write(f, &c, 1);
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confirmed = 1; /* we sent the null! */
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} else
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#endif
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{
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if (fromp->sin_family != AF_INET ||
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fromp->sin_port >= IPPORT_RESERVED ||
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fromp->sin_port < IPPORT_RESERVED/2) {
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syslog(LOG_NOTICE, "Connection from %s on illegal port",
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inet_ntoa(fromp->sin_addr));
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fatal(f, "Permission denied", 0);
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}
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#ifdef IP_OPTIONS
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{
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u_char optbuf[BUFSIZ/3];
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int optsize = sizeof(optbuf), ipproto, i;
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struct protoent *ip;
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if ((ip = getprotobyname("ip")) != NULL)
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ipproto = ip->p_proto;
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else
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ipproto = IPPROTO_IP;
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if (getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf,
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&optsize) == 0 && optsize != 0) {
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for (i = 0; i < optsize; ) {
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u_char c = optbuf[i];
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if (c == IPOPT_LSRR || c == IPOPT_SSRR) {
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syslog(LOG_NOTICE,
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"Connection refused from %s with IP option %s",
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inet_ntoa(fromp->sin_addr),
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c == IPOPT_LSRR ? "LSRR" : "SSRR");
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exit(1);
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}
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if (c == IPOPT_EOL)
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break;
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i += (c == IPOPT_NOP) ? 1 : optbuf[i+1];
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}
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}
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}
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#endif
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if (do_rlogin(fromp) == 0)
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authenticated++;
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}
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if (confirmed == 0) {
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write(f, "", 1);
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confirmed = 1; /* we sent the null! */
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}
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#ifdef KERBEROS
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#ifdef CRYPT
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if (doencrypt)
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(void) des_write(f, SECURE_MESSAGE, sizeof(SECURE_MESSAGE) - 1);
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#endif
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#endif
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netf = f;
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pid = forkpty(&master, line, NULL, &win);
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if (pid < 0) {
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if (errno == ENOENT)
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fatal(f, "Out of ptys", 0);
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else
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fatal(f, "Forkpty", 1);
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}
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if (pid == 0) {
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if (f > 2) /* f should always be 0, but... */
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(void) close(f);
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setup_term(0);
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if (*lusername=='-') {
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syslog(LOG_ERR, "tried to pass user \"%s\" to login",
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lusername);
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fatal(STDERR_FILENO, "invalid user", 0);
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}
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if (authenticated) {
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#ifdef KERBEROS
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if (use_kerberos && (pwd->pw_uid == 0))
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syslog(LOG_INFO|LOG_AUTH,
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"ROOT Kerberos login from %s.%s@%s on %s\n",
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kdata->pname, kdata->pinst, kdata->prealm,
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hostname);
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#endif
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execl(_PATH_LOGIN, "login", "-p",
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"-h", hostname, "-f", lusername, (char *)NULL);
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} else
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execl(_PATH_LOGIN, "login", "-p",
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"-h", hostname, lusername, (char *)NULL);
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fatal(STDERR_FILENO, _PATH_LOGIN, 1);
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/*NOTREACHED*/
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}
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#ifdef CRYPT
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#ifdef KERBEROS
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/*
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* If encrypted, don't turn on NBIO or the des read/write
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* routines will croak.
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*/
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if (!doencrypt)
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#endif
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#endif
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ioctl(f, FIONBIO, &on);
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ioctl(master, FIONBIO, &on);
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ioctl(master, TIOCPKT, &on);
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signal(SIGCHLD, cleanup);
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protocol(f, master);
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signal(SIGCHLD, SIG_IGN);
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cleanup(0);
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}
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char magic[2] = { 0377, 0377 };
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char oobdata[] = {TIOCPKT_WINDOW};
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/*
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* Handle a "control" request (signaled by magic being present)
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* in the data stream. For now, we are only willing to handle
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* window size changes.
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*/
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int
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control(pty, cp, n)
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int pty;
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char *cp;
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int n;
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{
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struct winsize w;
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if (n < 4+sizeof (w) || cp[2] != 's' || cp[3] != 's')
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return (0);
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oobdata[0] &= ~TIOCPKT_WINDOW; /* we know he heard */
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bcopy(cp+4, (char *)&w, sizeof(w));
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w.ws_row = ntohs(w.ws_row);
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w.ws_col = ntohs(w.ws_col);
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w.ws_xpixel = ntohs(w.ws_xpixel);
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w.ws_ypixel = ntohs(w.ws_ypixel);
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(void)ioctl(pty, TIOCSWINSZ, &w);
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return (4+sizeof (w));
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}
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/*
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* rlogin "protocol" machine.
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*/
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void
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protocol(f, p)
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register int f, p;
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{
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char pibuf[1024+1], fibuf[1024], *pbp, *fbp;
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register pcc = 0, fcc = 0;
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int cc, nfd, n;
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char cntl;
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/*
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* Must ignore SIGTTOU, otherwise we'll stop
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* when we try and set slave pty's window shape
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* (our controlling tty is the master pty).
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*/
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(void) signal(SIGTTOU, SIG_IGN);
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send(f, oobdata, 1, MSG_OOB); /* indicate new rlogin */
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if (f > p)
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nfd = f + 1;
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else
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nfd = p + 1;
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if (nfd > FD_SETSIZE) {
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syslog(LOG_ERR, "select mask too small, increase FD_SETSIZE");
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fatal(f, "internal error (select mask too small)", 0);
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}
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for (;;) {
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fd_set ibits, obits, ebits, *omask;
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FD_ZERO(&ebits);
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FD_ZERO(&ibits);
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FD_ZERO(&obits);
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omask = (fd_set *)NULL;
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if (fcc) {
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FD_SET(p, &obits);
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omask = &obits;
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} else
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FD_SET(f, &ibits);
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if (pcc >= 0)
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if (pcc) {
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FD_SET(f, &obits);
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omask = &obits;
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} else
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FD_SET(p, &ibits);
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FD_SET(p, &ebits);
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if ((n = select(nfd, &ibits, omask, &ebits, 0)) < 0) {
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if (errno == EINTR)
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continue;
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fatal(f, "select", 1);
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}
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if (n == 0) {
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/* shouldn't happen... */
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sleep(5);
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continue;
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}
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#define pkcontrol(c) ((c)&(TIOCPKT_FLUSHWRITE|TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))
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if (FD_ISSET(p, &ebits)) {
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cc = read(p, &cntl, 1);
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if (cc == 1 && pkcontrol(cntl)) {
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cntl |= oobdata[0];
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send(f, &cntl, 1, MSG_OOB);
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if (cntl & TIOCPKT_FLUSHWRITE) {
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pcc = 0;
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FD_CLR(p, &ibits);
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}
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}
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}
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if (FD_ISSET(f, &ibits)) {
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#ifdef CRYPT
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#ifdef KERBEROS
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if (doencrypt)
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fcc = des_read(f, fibuf, sizeof(fibuf));
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else
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#endif
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#endif
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fcc = read(f, fibuf, sizeof(fibuf));
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if (fcc < 0 && errno == EWOULDBLOCK)
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fcc = 0;
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else {
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register char *cp;
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int left, n;
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if (fcc <= 0)
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break;
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fbp = fibuf;
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top:
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for (cp = fibuf; cp < fibuf+fcc-1; cp++)
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if (cp[0] == magic[0] &&
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cp[1] == magic[1]) {
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left = fcc - (cp-fibuf);
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n = control(p, cp, left);
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if (n) {
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left -= n;
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if (left > 0)
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bcopy(cp+n, cp, left);
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fcc -= n;
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goto top; /* n^2 */
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}
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}
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FD_SET(p, &obits); /* try write */
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}
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}
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if (FD_ISSET(p, &obits) && fcc > 0) {
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cc = write(p, fbp, fcc);
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if (cc > 0) {
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fcc -= cc;
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fbp += cc;
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}
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}
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if (FD_ISSET(p, &ibits)) {
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pcc = read(p, pibuf, sizeof (pibuf));
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pbp = pibuf;
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if (pcc < 0 && errno == EWOULDBLOCK)
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pcc = 0;
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else if (pcc <= 0)
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break;
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else if (pibuf[0] == 0) {
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pbp++, pcc--;
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#ifdef CRYPT
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#ifdef KERBEROS
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if (!doencrypt)
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#endif
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#endif
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FD_SET(f, &obits); /* try write */
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} else {
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if (pkcontrol(pibuf[0])) {
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pibuf[0] |= oobdata[0];
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send(f, &pibuf[0], 1, MSG_OOB);
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}
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pcc = 0;
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}
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}
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if ((FD_ISSET(f, &obits)) && pcc > 0) {
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#ifdef CRYPT
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#ifdef KERBEROS
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if (doencrypt)
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|
cc = des_write(f, pbp, pcc);
|
|
else
|
|
#endif
|
|
#endif
|
|
cc = write(f, pbp, pcc);
|
|
if (cc < 0 && errno == EWOULDBLOCK) {
|
|
/*
|
|
* This happens when we try write after read
|
|
* from p, but some old kernels balk at large
|
|
* writes even when select returns true.
|
|
*/
|
|
if (!FD_ISSET(p, &ibits))
|
|
sleep(5);
|
|
continue;
|
|
}
|
|
if (cc > 0) {
|
|
pcc -= cc;
|
|
pbp += cc;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
cleanup(signo)
|
|
int signo;
|
|
{
|
|
char *p;
|
|
|
|
p = line + sizeof(_PATH_DEV) - 1;
|
|
if (logout(p))
|
|
logwtmp(p, "", "");
|
|
(void)chmod(line, 0666);
|
|
(void)chown(line, 0, 0);
|
|
*p = 'p';
|
|
(void)chmod(line, 0666);
|
|
(void)chown(line, 0, 0);
|
|
shutdown(netf, 2);
|
|
exit(1);
|
|
}
|
|
|
|
void
|
|
fatal(f, msg, syserr)
|
|
int f;
|
|
char *msg;
|
|
int syserr;
|
|
{
|
|
int len;
|
|
char buf[BUFSIZ], *bp = buf;
|
|
|
|
/*
|
|
* Prepend binary one to message if we haven't sent
|
|
* the magic null as confirmation.
|
|
*/
|
|
if (!confirmed)
|
|
*bp++ = '\01'; /* error indicator */
|
|
if (syserr)
|
|
len = sprintf(bp, "rlogind: %s: %s.\r\n",
|
|
msg, strerror(errno));
|
|
else
|
|
len = sprintf(bp, "rlogind: %s.\r\n", msg);
|
|
(void) write(f, buf, bp + len - buf);
|
|
exit(1);
|
|
}
|
|
|
|
int
|
|
do_rlogin(dest)
|
|
struct sockaddr_in *dest;
|
|
{
|
|
getstr(rusername, sizeof(rusername), "remuser too long");
|
|
getstr(lusername, sizeof(lusername), "locuser too long");
|
|
getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type too long");
|
|
|
|
pwd = getpwnam(lusername);
|
|
if (pwd == NULL)
|
|
return (-1);
|
|
/* XXX why don't we syslog() failure? */
|
|
return (iruserok(dest->sin_addr.s_addr, pwd->pw_uid == 0,
|
|
rusername, lusername));
|
|
}
|
|
|
|
void
|
|
getstr(buf, cnt, errmsg)
|
|
char *buf;
|
|
int cnt;
|
|
char *errmsg;
|
|
{
|
|
char c;
|
|
|
|
do {
|
|
if (read(0, &c, 1) != 1)
|
|
exit(1);
|
|
if (--cnt < 0)
|
|
fatal(STDOUT_FILENO, errmsg, 0);
|
|
*buf++ = c;
|
|
} while (c != 0);
|
|
}
|
|
|
|
extern char **environ;
|
|
|
|
void
|
|
setup_term(fd)
|
|
int fd;
|
|
{
|
|
register char *cp = index(term+ENVSIZE, '/');
|
|
char *speed;
|
|
struct termios tt;
|
|
|
|
#ifndef notyet
|
|
tcgetattr(fd, &tt);
|
|
if (cp) {
|
|
*cp++ = '\0';
|
|
speed = cp;
|
|
cp = index(speed, '/');
|
|
if (cp)
|
|
*cp++ = '\0';
|
|
cfsetspeed(&tt, atoi(speed));
|
|
}
|
|
|
|
tt.c_iflag = TTYDEF_IFLAG;
|
|
tt.c_oflag = TTYDEF_OFLAG;
|
|
tt.c_lflag = TTYDEF_LFLAG;
|
|
tcsetattr(fd, TCSAFLUSH, &tt);
|
|
#else
|
|
if (cp) {
|
|
*cp++ = '\0';
|
|
speed = cp;
|
|
cp = index(speed, '/');
|
|
if (cp)
|
|
*cp++ = '\0';
|
|
tcgetattr(fd, &tt);
|
|
cfsetspeed(&tt, atoi(speed));
|
|
tcsetattr(fd, TCSAFLUSH, &tt);
|
|
}
|
|
#endif
|
|
|
|
env[0] = term;
|
|
env[1] = 0;
|
|
environ = env;
|
|
}
|
|
|
|
#ifdef KERBEROS
|
|
#define VERSION_SIZE 9
|
|
|
|
/*
|
|
* Do the remote kerberos login to the named host with the
|
|
* given inet address
|
|
*
|
|
* Return 0 on valid authorization
|
|
* Return -1 on valid authentication, no authorization
|
|
* Return >0 for error conditions
|
|
*/
|
|
int
|
|
do_krb_login(dest)
|
|
struct sockaddr_in *dest;
|
|
{
|
|
int rc;
|
|
char instance[INST_SZ], version[VERSION_SIZE];
|
|
long authopts = 0L; /* !mutual */
|
|
struct sockaddr_in faddr;
|
|
|
|
kdata = (AUTH_DAT *) auth_buf;
|
|
ticket = (KTEXT) tick_buf;
|
|
|
|
instance[0] = '*';
|
|
instance[1] = '\0';
|
|
|
|
#ifdef CRYPT
|
|
if (doencrypt) {
|
|
rc = sizeof(faddr);
|
|
if (getsockname(0, (struct sockaddr *)&faddr, &rc))
|
|
return (-1);
|
|
authopts = KOPT_DO_MUTUAL;
|
|
rc = krb_recvauth(
|
|
authopts, 0,
|
|
ticket, "rcmd",
|
|
instance, dest, &faddr,
|
|
kdata, "", schedule, version);
|
|
des_set_key_krb(&kdata->session, schedule);
|
|
|
|
} else
|
|
#endif
|
|
rc = krb_recvauth(
|
|
authopts, 0,
|
|
ticket, "rcmd",
|
|
instance, dest, (struct sockaddr_in *) 0,
|
|
kdata, "", NULL, version);
|
|
|
|
if (rc != KSUCCESS)
|
|
return (rc);
|
|
|
|
getstr(lusername, sizeof(lusername), "locuser");
|
|
/* get the "cmd" in the rcmd protocol */
|
|
getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type");
|
|
|
|
pwd = getpwnam(lusername);
|
|
if (pwd == NULL)
|
|
return (-1);
|
|
|
|
/* returns nonzero for no access */
|
|
if (kuserok(kdata, lusername) != 0)
|
|
return (-1);
|
|
|
|
return (0);
|
|
|
|
}
|
|
#endif /* KERBEROS */
|
|
|
|
void
|
|
usage()
|
|
{
|
|
#ifdef KERBEROS
|
|
syslog(LOG_ERR, "usage: rlogind [-Daln] [-k | -v]");
|
|
#else
|
|
syslog(LOG_ERR, "usage: rlogind [-Daln]");
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Check whether host h is in our local domain,
|
|
* defined as sharing the last two components of the domain part,
|
|
* or the entire domain part if the local domain has only one component.
|
|
* If either name is unqualified (contains no '.'),
|
|
* assume that the host is local, as it will be
|
|
* interpreted as such.
|
|
*/
|
|
int
|
|
local_domain(h)
|
|
char *h;
|
|
{
|
|
char localhost[MAXHOSTNAMELEN];
|
|
char *p1, *p2;
|
|
|
|
localhost[0] = 0;
|
|
(void) gethostname(localhost, sizeof(localhost));
|
|
p1 = topdomain(localhost);
|
|
p2 = topdomain(h);
|
|
if (p1 == NULL || p2 == NULL || !strcasecmp(p1, p2))
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
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);
|
|
}
|