479 lines
9.8 KiB
C
479 lines
9.8 KiB
C
/*-
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* Copyright (c) 1983, 1990, 1993, 1994
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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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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1983, 1990, 1993, 1994\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[] = "From: @(#)rsh.c 8.3 (Berkeley) 4/6/94";
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static char rcsid[] =
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"$Id$";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/signal.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/file.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <err.h>
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#include <errno.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <varargs.h>
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#include "pathnames.h"
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#ifdef KERBEROS
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#include <kerberosIV/des.h>
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#include <kerberosIV/krb.h>
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CREDENTIALS cred;
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Key_schedule schedule;
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int use_kerberos = 1, doencrypt;
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char dst_realm_buf[REALM_SZ], *dest_realm;
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extern char *krb_realmofhost();
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#endif
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/*
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* rsh - remote shell
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*/
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int rfd2;
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char *copyargs __P((char **));
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void sendsig __P((int));
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void talk __P((int, long, pid_t, int));
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void usage __P((void));
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void warning __P(());
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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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struct passwd *pw;
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struct servent *sp;
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long omask;
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int argoff, asrsh, ch, dflag, nflag, one, rem;
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pid_t pid;
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uid_t uid;
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char *args, *host, *p, *user;
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argoff = asrsh = dflag = nflag = 0;
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one = 1;
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host = user = NULL;
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/* if called as something other than "rsh", use it as the host name */
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if (p = strrchr(argv[0], '/'))
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++p;
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else
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p = argv[0];
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if (strcmp(p, "rsh"))
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host = p;
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else
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asrsh = 1;
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/* handle "rsh host flags" */
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if (!host && argc > 2 && argv[1][0] != '-') {
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host = argv[1];
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argoff = 1;
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}
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#ifdef KERBEROS
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#ifdef CRYPT
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#define OPTIONS "8KLde:k:l:nwx"
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#else
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#define OPTIONS "8KLde:k:l:nw"
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#endif
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#else
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#define OPTIONS "8KLde:l:nw"
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#endif
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while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != EOF)
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switch(ch) {
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case 'K':
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#ifdef KERBEROS
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use_kerberos = 0;
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#endif
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break;
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case 'L': /* -8Lew are ignored to allow rlogin aliases */
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case 'e':
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case 'w':
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case '8':
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break;
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case 'd':
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dflag = 1;
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break;
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case 'l':
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user = optarg;
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break;
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#ifdef KERBEROS
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case 'k':
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dest_realm = dst_realm_buf;
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strncpy(dest_realm, optarg, REALM_SZ);
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break;
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#endif
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case 'n':
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nflag = 1;
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break;
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#ifdef KERBEROS
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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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}
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optind += argoff;
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/* if haven't gotten a host yet, do so */
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if (!host && !(host = argv[optind++]))
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usage();
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/* if no further arguments, must have been called as rlogin. */
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if (!argv[optind]) {
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if (asrsh)
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*argv = "rlogin";
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execv(_PATH_RLOGIN, argv);
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err(1, "can't exec %s", _PATH_RLOGIN);
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}
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argc -= optind;
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argv += optind;
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if (!(pw = getpwuid(uid = getuid())))
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errx(1, "unknown user id");
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if (!user)
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user = pw->pw_name;
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#ifdef KERBEROS
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#ifdef CRYPT
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/* -x turns off -n */
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if (doencrypt)
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nflag = 0;
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#endif
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#endif
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args = copyargs(argv);
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sp = NULL;
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#ifdef KERBEROS
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if (use_kerberos) {
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sp = getservbyname((doencrypt ? "ekshell" : "kshell"), "tcp");
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if (sp == NULL) {
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use_kerberos = 0;
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warning("can't get entry for %s/tcp service",
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doencrypt ? "ekshell" : "kshell");
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}
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}
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#endif
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if (sp == NULL)
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sp = getservbyname("shell", "tcp");
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if (sp == NULL)
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errx(1, "shell/tcp: unknown service");
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#ifdef KERBEROS
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try_connect:
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if (use_kerberos) {
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struct hostent *hp;
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/* fully qualify hostname (needed for krb_realmofhost) */
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hp = gethostbyname(host);
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if (hp != NULL && !(host = strdup(hp->h_name)))
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err(1, NULL);
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rem = KSUCCESS;
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errno = 0;
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if (dest_realm == NULL)
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dest_realm = krb_realmofhost(host);
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#ifdef CRYPT
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if (doencrypt) {
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rem = krcmd_mutual(&host, sp->s_port, user, args,
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&rfd2, dest_realm, &cred, schedule);
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des_set_key(cred.session, schedule);
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} else
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#endif
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rem = krcmd(&host, sp->s_port, user, args, &rfd2,
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dest_realm);
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if (rem < 0) {
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use_kerberos = 0;
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sp = getservbyname("shell", "tcp");
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if (sp == NULL)
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errx(1, "shell/tcp: unknown service");
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if (errno == ECONNREFUSED)
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warning("remote host doesn't support Kerberos");
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if (errno == ENOENT)
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warning("can't provide Kerberos auth data");
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goto try_connect;
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}
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} else {
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if (doencrypt)
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errx(1, "the -x flag requires Kerberos authentication");
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rem = rcmd(&host, sp->s_port, pw->pw_name, user, args, &rfd2);
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}
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#else
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rem = rcmd(&host, sp->s_port, pw->pw_name, user, args, &rfd2);
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#endif
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if (rem < 0)
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exit(1);
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if (rfd2 < 0)
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errx(1, "can't establish stderr");
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if (dflag) {
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if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one,
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sizeof(one)) < 0)
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warn("setsockopt");
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if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
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sizeof(one)) < 0)
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warn("setsockopt");
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}
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(void)setuid(uid);
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omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
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if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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(void)signal(SIGINT, sendsig);
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if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
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(void)signal(SIGQUIT, sendsig);
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if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
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(void)signal(SIGTERM, sendsig);
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if (!nflag) {
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pid = fork();
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if (pid < 0)
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err(1, "fork");
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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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#endif
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#endif
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{
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(void)ioctl(rfd2, FIONBIO, &one);
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(void)ioctl(rem, FIONBIO, &one);
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}
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talk(nflag, omask, pid, rem);
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if (!nflag)
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(void)kill(pid, SIGKILL);
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exit(0);
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}
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void
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talk(nflag, omask, pid, rem)
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int nflag;
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long omask;
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pid_t pid;
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int rem;
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{
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int cc, wc;
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fd_set readfrom, ready, rembits;
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char *bp, buf[BUFSIZ];
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if (!nflag && pid == 0) {
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(void)close(rfd2);
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reread: errno = 0;
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if ((cc = read(0, buf, sizeof buf)) <= 0)
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goto done;
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bp = buf;
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rewrite:
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FD_ZERO(&rembits);
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FD_SET(rem, &rembits);
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if (select(16, 0, &rembits, 0, 0) < 0) {
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if (errno != EINTR)
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err(1, "select");
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goto rewrite;
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}
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if (!FD_ISSET(rem, &rembits))
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goto rewrite;
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#ifdef KERBEROS
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#ifdef CRYPT
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if (doencrypt)
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wc = des_write(rem, bp, cc);
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else
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#endif
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#endif
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wc = write(rem, bp, cc);
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if (wc < 0) {
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if (errno == EWOULDBLOCK)
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goto rewrite;
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goto done;
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}
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bp += wc;
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cc -= wc;
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if (cc == 0)
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goto reread;
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goto rewrite;
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done:
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(void)shutdown(rem, 1);
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exit(0);
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}
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(void)sigsetmask(omask);
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FD_ZERO(&readfrom);
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FD_SET(rfd2, &readfrom);
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FD_SET(rem, &readfrom);
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do {
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ready = readfrom;
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if (select(16, &ready, 0, 0, 0) < 0) {
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if (errno != EINTR)
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err(1, "select");
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continue;
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}
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if (FD_ISSET(rfd2, &ready)) {
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errno = 0;
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#ifdef KERBEROS
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#ifdef CRYPT
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if (doencrypt)
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cc = des_read(rfd2, buf, sizeof buf);
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else
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#endif
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#endif
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cc = read(rfd2, buf, sizeof buf);
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if (cc <= 0) {
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if (errno != EWOULDBLOCK)
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FD_CLR(rfd2, &readfrom);
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} else
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(void)write(2, buf, cc);
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}
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if (FD_ISSET(rem, &ready)) {
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errno = 0;
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#ifdef KERBEROS
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#ifdef CRYPT
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if (doencrypt)
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cc = des_read(rem, buf, sizeof buf);
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else
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#endif
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#endif
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cc = read(rem, buf, sizeof buf);
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if (cc <= 0) {
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if (errno != EWOULDBLOCK)
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FD_CLR(rem, &readfrom);
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} else
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(void)write(1, buf, cc);
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}
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} while (FD_ISSET(rfd2, &readfrom) || FD_ISSET(rem, &readfrom));
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}
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void
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sendsig(sig)
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int sig;
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{
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char signo;
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signo = sig;
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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(rfd2, &signo, 1);
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else
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#endif
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#endif
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(void)write(rfd2, &signo, 1);
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}
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#ifdef KERBEROS
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/* VARARGS */
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void
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warning(va_alist)
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va_dcl
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{
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va_list ap;
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char *fmt;
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(void)fprintf(stderr, "rsh: warning, using standard rsh: ");
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va_start(ap);
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fmt = va_arg(ap, char *);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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(void)fprintf(stderr, ".\n");
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}
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#endif
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char *
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copyargs(argv)
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char **argv;
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{
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int cc;
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char **ap, *args, *p;
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cc = 0;
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for (ap = argv; *ap; ++ap)
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cc += strlen(*ap) + 1;
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if (!(args = malloc((u_int)cc)))
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err(1, NULL);
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for (p = args, ap = argv; *ap; ++ap) {
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(void)strcpy(p, *ap);
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for (p = strcpy(p, *ap); *p; ++p);
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if (ap[1])
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*p++ = ' ';
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}
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return (args);
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}
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void
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usage()
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{
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(void)fprintf(stderr,
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"usage: rsh [-nd%s]%s[-l login] host [command]\n",
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#ifdef KERBEROS
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#ifdef CRYPT
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"x", " [-k realm] ");
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#else
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"", " [-k realm] ");
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#endif
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#else
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"", " ");
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#endif
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exit(1);
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}
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