379 lines
8.8 KiB
C
379 lines
8.8 KiB
C
/*-
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* Copyright (c) 1983, 1990 The Regents of the University of California.
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* 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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#include "bsd_locl.h"
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RCSID("$Id: rsh.c,v 1.43 1999/11/13 06:13:34 assar Exp $");
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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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/*
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* rsh - remote shell
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*/
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int rfd2;
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static void
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usage(void)
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{
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fprintf(stderr,
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"usage: rsh [-ndKx] [-k realm] [-p port] [-l login] host [command]\n");
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exit(1);
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}
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static char *
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copyargs(char **argv)
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{
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int cc;
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char **ap, *p;
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char *args;
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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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args = malloc(cc);
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if (args == NULL)
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errx(1, "Out of memory.");
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for (p = args, ap = argv; *ap; ++ap) {
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strcpy(p, *ap);
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while(*p)
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++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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static RETSIGTYPE
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sendsig(int signo_)
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{
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char signo = signo_;
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#ifndef NOENCRYPTION
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if (doencrypt)
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des_enc_write(rfd2, &signo, 1, schedule, &cred.session);
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else
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#endif
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write(rfd2, &signo, 1);
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}
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static void
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talk(int nflag, sigset_t omask, int pid, int rem)
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{
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int cc, wc;
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char *bp;
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fd_set readfrom, ready, rembits;
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char buf[DES_RW_MAXWRITE];
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if (pid == 0) {
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if (nflag)
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goto done;
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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: FD_ZERO(&rembits);
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FD_SET(rem, &rembits);
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if (select(rem + 1, 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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#ifndef NOENCRYPTION
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if (doencrypt)
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wc = des_enc_write(rem, bp, cc, schedule, &cred.session);
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else
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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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shutdown(rem, 1);
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exit(0);
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}
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if (sigprocmask(SIG_SETMASK, &omask, 0) != 0)
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warn("sigprocmask");
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FD_ZERO(&readfrom);
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FD_SET(rem, &readfrom);
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FD_SET(rfd2, &readfrom);
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do {
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ready = readfrom;
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if (select(max(rem,rfd2)+1, &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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#ifndef NOENCRYPTION
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if (doencrypt)
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cc = des_enc_read(rfd2, buf, sizeof buf,
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schedule, &cred.session);
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else
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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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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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#ifndef NOENCRYPTION
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if (doencrypt)
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cc = des_enc_read(rem, buf, sizeof buf,
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schedule, &cred.session);
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else
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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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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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int
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main(int argc, char **argv)
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{
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struct passwd *pw;
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int sv_port, user_port = 0;
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sigset_t omask;
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int argoff, ch, dflag, nflag, nfork, one, pid, rem, uid;
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char *args, *host, *user, *local_user;
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argoff = dflag = nflag = nfork = 0;
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one = 1;
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host = user = NULL;
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pid = 1;
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set_progname(argv[0]);
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/* handle "rsh host flags" */
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if (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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#define OPTIONS "+8KLde:k:l:np:wx"
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while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
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switch(ch) {
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case 'K':
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use_kerberos = 0;
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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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case 'k':
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dest_realm = dst_realm_buf;
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strlcpy(dest_realm, optarg, REALM_SZ);
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break;
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case 'n':
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nflag = nfork = 1;
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break;
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case 'x':
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doencrypt = 1;
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break;
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case 'p': {
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char *endptr;
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user_port = strtol (optarg, &endptr, 0);
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if (user_port == 0 && optarg == endptr)
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errx (1, "Bad port `%s'", optarg);
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user_port = htons(user_port);
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break;
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}
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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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*argv = "rlogin";
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setuid(getuid());
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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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#ifndef __CYGWIN32__
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if (!(pw = k_getpwuid(uid = getuid())))
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errx(1, "unknown user id.");
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local_user = pw->pw_name;
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if (!user)
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user = local_user;
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#else
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if (!user)
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errx(1, "Sorry, you need to specify the username (with -l)");
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local_user = user;
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#endif
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/* -n must still fork but does not turn of the -n functionality */
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if (doencrypt)
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nfork = 0;
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args = copyargs(argv+optind);
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if (user_port)
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sv_port = user_port;
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else
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sv_port = get_shell_port(use_kerberos, doencrypt);
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if (use_kerberos) {
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setuid(getuid());
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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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if (doencrypt)
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rem = krcmd_mutual(&host, sv_port, user, args,
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&rfd2, dest_realm, &cred, schedule);
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else
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rem = krcmd(&host, sv_port, user, args, &rfd2,
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dest_realm);
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if (rem < 0) {
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int i = 0;
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char **newargv;
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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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newargv = malloc((argc + 2) * sizeof(*newargv));
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if (newargv == NULL)
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err(1, "malloc");
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newargv[i] = argv[i];
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++i;
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if (argv[i][0] != '-') {
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newargv[i] = argv[i];
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++i;
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}
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newargv[i++] = "-K";
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for(; i <= argc; ++i)
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newargv[i] = argv[i - 1];
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newargv[argc + 1] = NULL;
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execv(_PATH_RSH, newargv);
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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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if (geteuid() != 0)
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errx(1, "not installed setuid root, "
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"only root may use non kerberized rsh");
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rem = rcmd(&host, sv_port, local_user, user, args, &rfd2);
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}
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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 defined(SO_DEBUG) && defined(HAVE_SETSOCKOPT)
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if (dflag) {
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if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, (void *)&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, (void *)&one,
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sizeof(one)) < 0)
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warn("setsockopt");
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}
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#endif
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setuid(uid);
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{
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sigset_t sigmsk;
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sigemptyset(&sigmsk);
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sigaddset(&sigmsk, SIGINT);
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sigaddset(&sigmsk, SIGQUIT);
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sigaddset(&sigmsk, SIGTERM);
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if (sigprocmask(SIG_BLOCK, &sigmsk, &omask) != 0)
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warn("sigprocmask");
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}
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if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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signal(SIGINT, sendsig);
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if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
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signal(SIGQUIT, sendsig);
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if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
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signal(SIGTERM, sendsig);
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if (!nfork) {
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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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if (!doencrypt) {
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ioctl(rfd2, FIONBIO, &one);
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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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kill(pid, SIGKILL);
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exit(0);
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}
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