415 lines
10 KiB
C
415 lines
10 KiB
C
/*
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* Copyright (c) 1983, 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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int __ivaliduser __P((FILE *, u_int32_t, const char *, const char *));
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static int __icheckhost __P((u_int32_t, char *));
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int
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rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
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char **ahost;
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u_short rport;
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const char *locuser, *remuser, *cmd;
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int *fd2p;
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{
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struct hostent *hp;
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struct sockaddr_in sin, from;
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fd_set reads;
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int32_t oldmask;
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pid_t pid;
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int s, lport, timo;
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char c;
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pid = getpid();
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hp = gethostbyname(*ahost);
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if (hp == NULL) {
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herror(*ahost);
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return (-1);
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}
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*ahost = hp->h_name;
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oldmask = sigblock(sigmask(SIGURG));
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for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
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s = rresvport(&lport);
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if (s < 0) {
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if (errno == EAGAIN)
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(void)fprintf(stderr,
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_("rcmd: socket: All ports in use\n"));
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else
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(void)fprintf(stderr, "rcmd: socket: %s\n",
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strerror(errno));
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sigsetmask(oldmask);
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return (-1);
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}
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fcntl(s, F_SETOWN, pid);
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sin.sin_family = hp->h_addrtype;
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bcopy(hp->h_addr_list[0], &sin.sin_addr, hp->h_length);
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sin.sin_port = rport;
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if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
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break;
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(void)close(s);
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if (errno == EADDRINUSE) {
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lport--;
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continue;
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}
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if (errno == ECONNREFUSED && timo <= 16) {
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(void)sleep(timo);
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timo *= 2;
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continue;
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}
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if (hp->h_addr_list[1] != NULL) {
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int oerrno = errno;
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(void)fprintf(stderr, _("connect to address %s: "),
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inet_ntoa(sin.sin_addr));
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__set_errno (oerrno);
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perror(0);
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hp->h_addr_list++;
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bcopy(hp->h_addr_list[0], &sin.sin_addr, hp->h_length);
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(void)fprintf(stderr, _("Trying %s...\n"),
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inet_ntoa(sin.sin_addr));
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continue;
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}
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(void)fprintf(stderr, "%s: %s\n", hp->h_name, strerror(errno));
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sigsetmask(oldmask);
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return (-1);
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}
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lport--;
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if (fd2p == 0) {
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write(s, "", 1);
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lport = 0;
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} else {
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char num[8];
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int s2 = rresvport(&lport), s3;
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int len = sizeof(from);
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if (s2 < 0)
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goto bad;
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listen(s2, 1);
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(void)snprintf(num, sizeof(num), "%d", lport);
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if (write(s, num, strlen(num)+1) != strlen(num)+1) {
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(void)fprintf(stderr,
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_("rcmd: write (setting up stderr): %s\n"),
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strerror(errno));
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(void)close(s2);
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goto bad;
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}
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FD_ZERO(&reads);
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FD_SET(s, &reads);
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FD_SET(s2, &reads);
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__set_errno (0);
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if (select(1 + (s > s2 ? s : s2), &reads, 0, 0, 0) < 1 ||
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!FD_ISSET(s2, &reads)) {
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if (errno != 0)
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(void)fprintf(stderr,
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_("rcmd: select (setting up stderr): %s\n"),
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strerror(errno));
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else
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(void)fprintf(stderr,
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_("select: protocol failure in circuit setup\n"));
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(void)close(s2);
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goto bad;
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}
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s3 = accept(s2, (struct sockaddr *)&from, &len);
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(void)close(s2);
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if (s3 < 0) {
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(void)fprintf(stderr,
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"rcmd: accept: %s\n", strerror(errno));
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lport = 0;
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goto bad;
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}
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*fd2p = s3;
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from.sin_port = ntohs((u_short)from.sin_port);
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if (from.sin_family != AF_INET ||
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from.sin_port >= IPPORT_RESERVED ||
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from.sin_port < IPPORT_RESERVED / 2) {
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(void)fprintf(stderr,
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_("socket: protocol failure in circuit setup\n"));
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goto bad2;
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}
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}
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(void)write(s, locuser, strlen(locuser)+1);
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(void)write(s, remuser, strlen(remuser)+1);
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(void)write(s, cmd, strlen(cmd)+1);
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if (read(s, &c, 1) != 1) {
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(void)fprintf(stderr,
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"rcmd: %s: %s\n", *ahost, strerror(errno));
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goto bad2;
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}
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if (c != 0) {
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while (read(s, &c, 1) == 1) {
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(void)write(STDERR_FILENO, &c, 1);
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if (c == '\n')
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break;
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}
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goto bad2;
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}
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sigsetmask(oldmask);
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return (s);
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bad2:
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if (lport)
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(void)close(*fd2p);
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bad:
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(void)close(s);
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sigsetmask(oldmask);
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return (-1);
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}
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int
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rresvport(alport)
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int *alport;
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{
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struct sockaddr_in sin;
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int s;
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = INADDR_ANY;
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s = socket(AF_INET, SOCK_STREAM, 0);
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if (s < 0)
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return (-1);
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for (;;) {
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sin.sin_port = htons((u_short)*alport);
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if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
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return (s);
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if (errno != EADDRINUSE) {
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(void)close(s);
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return (-1);
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}
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(*alport)--;
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if (*alport == IPPORT_RESERVED/2) {
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(void)close(s);
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__set_errno (EAGAIN); /* close */
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return (-1);
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}
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}
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}
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int __check_rhosts_file = 1;
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char *__rcmd_errstr;
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int
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ruserok(rhost, superuser, ruser, luser)
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const char *rhost, *ruser, *luser;
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int superuser;
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{
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struct hostent *hp;
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u_int32_t addr;
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char **ap;
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if ((hp = gethostbyname(rhost)) == NULL)
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return (-1);
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for (ap = hp->h_addr_list; *ap; ++ap) {
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bcopy(*ap, &addr, sizeof(addr));
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if (iruserok(addr, superuser, ruser, luser) == 0)
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return (0);
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}
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return (-1);
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}
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/*
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* New .rhosts strategy: We are passed an ip address. We spin through
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* hosts.equiv and .rhosts looking for a match. When the .rhosts only
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* has ip addresses, we don't have to trust a nameserver. When it
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* contains hostnames, we spin through the list of addresses the nameserver
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* gives us and look for a match.
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*
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* Returns 0 if ok, -1 if not ok.
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*/
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int
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iruserok(raddr, superuser, ruser, luser)
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u_int32_t raddr;
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int superuser;
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const char *ruser, *luser;
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{
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register char *cp;
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struct stat sbuf;
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struct passwd *pwd;
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FILE *hostf;
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uid_t uid;
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int first;
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first = 1;
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hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
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again:
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if (hostf) {
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if (__ivaliduser(hostf, raddr, luser, ruser) == 0) {
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(void)fclose(hostf);
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return (0);
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}
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(void)fclose(hostf);
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}
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if (first == 1 && (__check_rhosts_file || superuser)) {
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char *pbuf;
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size_t dirlen;
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first = 0;
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if ((pwd = getpwnam(luser)) == NULL)
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return (-1);
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dirlen = strlen (pwd->pw_dir);
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pbuf = alloca (dirlen + sizeof "/.rhosts");
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memcpy (pbuf, pwd->pw_dir, dirlen);
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memcpy (pbuf + dirlen, "/.rhosts", sizeof "/.rhosts");
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/*
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* Change effective uid while opening .rhosts. If root and
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* reading an NFS mounted file system, can't read files that
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* are protected read/write owner only.
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*/
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uid = geteuid();
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(void)seteuid(pwd->pw_uid);
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hostf = fopen(pbuf, "r");
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(void)seteuid(uid);
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if (hostf == NULL)
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return (-1);
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/*
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* If not a regular file, or is owned by someone other than
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* user or root or if writeable by anyone but the owner, quit.
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*/
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cp = NULL;
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if (lstat(pbuf, &sbuf) < 0)
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cp = _(".rhosts lstat failed");
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else if (!S_ISREG(sbuf.st_mode))
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cp = _(".rhosts not regular file");
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else if (fstat(fileno(hostf), &sbuf) < 0)
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cp = _(".rhosts fstat failed");
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else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
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cp = _("bad .rhosts owner");
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else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
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cp = _(".rhosts writeable by other than owner");
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/* If there were any problems, quit. */
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if (cp) {
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__rcmd_errstr = cp;
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(void)fclose(hostf);
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return (-1);
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}
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goto again;
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}
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return (-1);
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}
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/*
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* XXX
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* Don't make static, used by lpd(8).
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*
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* Returns 0 if ok, -1 if not ok.
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*/
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int
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__ivaliduser(hostf, raddr, luser, ruser)
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FILE *hostf;
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u_int32_t raddr;
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const char *luser, *ruser;
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{
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register char *user, *p;
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int ch;
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char *buf = NULL;
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size_t bufsize = 0;
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ssize_t nread;
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while ((nread = getline (&buf, &bufsize, hostf)) > 0) {
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buf[bufsize - 1] = '\0'; /* Make sure it's terminated. */
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p = buf;
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while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
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*p = isupper(*p) ? tolower(*p) : *p;
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p++;
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}
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if (*p == ' ' || *p == '\t') {
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*p++ = '\0';
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while (*p == ' ' || *p == '\t')
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p++;
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user = p;
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while (*p != '\n' && *p != ' ' &&
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*p != '\t' && *p != '\0')
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p++;
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} else
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user = p;
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*p = '\0';
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if (__icheckhost(raddr, buf) &&
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strcmp(ruser, *user ? user : luser) == 0) {
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free (buf);
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return (0);
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}
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}
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free (buf);
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return (-1);
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}
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/*
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* Returns "true" if match, 0 if no match.
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*/
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static int
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__icheckhost(raddr, lhost)
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u_int32_t raddr;
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register char *lhost;
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{
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register struct hostent *hp;
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register u_int32_t laddr;
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register char **pp;
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/* Try for raw ip address first. */
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if (isdigit(*lhost) && (int32_t)(laddr = inet_addr(lhost)) != -1)
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return (raddr == laddr);
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/* Better be a hostname. */
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if ((hp = gethostbyname(lhost)) == NULL)
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return (0);
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/* Spin through ip addresses. */
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for (pp = hp->h_addr_list; *pp; ++pp)
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if (!bcmp(&raddr, *pp, sizeof(u_int32_t)))
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return (1);
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/* No match. */
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return (0);
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}
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