353 lines
8.4 KiB
C
353 lines
8.4 KiB
C
/*
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* Copyright (c) 1983 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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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)rcmd.c 5.24 (Berkeley) 2/24/91";*/
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static char *rcsid = "$Id: rcmd.c,v 1.3 1993/08/26 00:46:13 jtc Exp $";
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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 <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 <unistd.h>
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#include <string.h>
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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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int s, timo = 1, pid;
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long oldmask;
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struct sockaddr_in sin, sin2, from;
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char c;
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int lport = IPPORT_RESERVED - 1;
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struct hostent *hp;
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fd_set reads;
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pid = getpid();
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hp = gethostbyname(*ahost);
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if (hp == 0) {
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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 (;;) {
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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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fprintf(stderr, "socket: All ports in use\n");
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else
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perror("rcmd: socket");
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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], (caddr_t)&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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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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fprintf(stderr,
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"connect to address %s: ", inet_ntoa(sin.sin_addr));
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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], (caddr_t)&sin.sin_addr,
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hp->h_length);
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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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perror(hp->h_name);
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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) sprintf(num, "%d", lport);
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if (write(s, num, strlen(num)+1) != strlen(num)+1) {
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perror("write: setting up stderr");
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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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errno = 0;
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if (select(32, &reads, 0, 0, 0) < 1 ||
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!FD_ISSET(s2, &reads)) {
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if (errno != 0)
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perror("select: setting up stderr");
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else
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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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perror("accept");
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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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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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perror(*ahost);
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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(2, &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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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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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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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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FILE *hostf;
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char fhost[MAXHOSTNAMELEN];
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int first = 1;
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register char *sp, *p;
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int baselen = -1;
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sp = (char *)rhost;
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p = fhost;
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while (*sp) {
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if (*sp == '.') {
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if (baselen == -1)
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baselen = sp - rhost;
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*p++ = *sp++;
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} else {
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*p++ = isupper(*sp) ? tolower(*sp++) : *sp++;
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}
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}
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*p = '\0';
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hostf = superuser ? (FILE *)0 : fopen(_PATH_HEQUIV, "r");
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again:
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if (hostf) {
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if (!_validuser(hostf, fhost, luser, ruser, baselen)) {
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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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struct stat sbuf;
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struct passwd *pwd;
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char pbuf[MAXPATHLEN];
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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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(void)strcpy(pbuf, pwd->pw_dir);
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(void)strcat(pbuf, "/.rhosts");
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if ((hostf = fopen(pbuf, "r")) == NULL)
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return(-1);
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/*
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* if owned by someone other than user or root or if
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* writeable by anyone but the owner, quit
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*/
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if (fstat(fileno(hostf), &sbuf) ||
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sbuf.st_uid && sbuf.st_uid != pwd->pw_uid ||
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sbuf.st_mode&022) {
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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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/* don't make static, used by lpd(8) */
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_validuser(hostf, rhost, luser, ruser, baselen)
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char *rhost, *luser, *ruser;
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FILE *hostf;
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int baselen;
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{
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register char *p;
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char *user, ahost[MAXHOSTNAMELEN];
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static int _checkhost();
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while (fgets(ahost, sizeof (ahost), hostf)) {
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p = ahost;
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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 != ' ' && *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 (_checkhost(rhost, ahost, baselen) &&
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!strcmp(ruser, *user ? user : luser)) {
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return (0);
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}
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}
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return (-1);
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}
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static
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_checkhost(rhost, lhost, len)
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char *rhost, *lhost;
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int len;
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{
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static char ldomain[MAXHOSTNAMELEN + 1];
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static char *domainp = NULL;
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static int nodomain = 0;
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register char *cp;
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if (len == -1)
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return(!strcmp(rhost, lhost));
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if (strncmp(rhost, lhost, len))
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return(0);
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if (!strcmp(rhost, lhost))
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return(1);
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if (*(lhost + len) != '\0')
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return(0);
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if (nodomain)
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return(0);
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if (!domainp) {
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if (gethostname(ldomain, sizeof(ldomain)) == -1) {
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nodomain = 1;
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return(0);
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}
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ldomain[MAXHOSTNAMELEN] = NULL;
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if ((domainp = index(ldomain, '.')) == (char *)NULL) {
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nodomain = 1;
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return(0);
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}
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for (cp = ++domainp; *cp; ++cp)
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if (isupper(*cp))
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*cp = tolower(*cp);
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}
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return(!strcmp(domainp, rhost + len +1));
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}
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