51295a4d3e
Submitted-By: Kent Vander Velden <graphix@iastate.edu>
516 lines
13 KiB
C
516 lines
13 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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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#endif
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extern int innetgr __P(( const char *, const char *, const char *, const char * ));
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#define max(a, b) ((a > b) ? a : b)
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int __ivaliduser __P((FILE *, u_long, const char *, const char *));
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static int __icheckhost __P((u_long, 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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long 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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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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int nfds;
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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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nfds = max(s, s2)+1;
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if(nfds > FD_SETSIZE) {
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fprintf(stderr, "rcmd: too many files\n");
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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(nfds, &reads, 0, 0, 0) < 1 || !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, on, len;
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = INADDR_ANY;
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sin.sin_port = 0;
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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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on = IP_PORTRANGE_LOW;
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if (setsockopt(s, IPPROTO_IP, IP_PORTRANGE, (char*)&on, sizeof(on)) < 0)
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{
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(void)close(s);
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return(-1);
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}
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if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) {
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/* attempt to find the port that we were assigned */
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len = sizeof(sin);
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if (getsockname(s, (struct sockaddr *)&sin, &len) >= 0)
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*alport = ntohs(sin.sin_port);
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else {
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(void)close(s);
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return (-1);
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}
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return (s);
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}
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if (errno == EADDRNOTAVAIL) /* no available ports? */
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errno = EAGAIN; /* "official" return for this case */
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(void)close(s);
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return (-1);
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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_long 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_long 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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char pbuf[MAXPATHLEN];
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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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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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/*
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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_long 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[MAXHOSTNAMELEN + 128]; /* host + login */
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char hname[MAXHOSTNAMELEN];
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struct hostent *hp;
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/* Presumed guilty until proven innocent. */
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int userok = 0, hostok = 0;
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#ifdef YP
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char *ypdomain;
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if (yp_get_default_domain(&ypdomain))
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ypdomain = NULL;
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#else
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#define ypdomain NULL
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#endif
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/* We need to get the damn hostname back for netgroup matching. */
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if ((hp = gethostbyaddr((char *)&raddr, sizeof(u_long),
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AF_INET)) == NULL)
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return (-1);
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strcpy(hname, hp->h_name);
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while (fgets(buf, sizeof(buf), hostf)) {
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p = buf;
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/* Skip lines that are too long. */
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if (strchr(p, '\n') == NULL) {
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while ((ch = getc(hostf)) != '\n' && ch != EOF);
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continue;
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}
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if (*p == '\n' || *p == '#') {
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/* comment... */
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continue;
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}
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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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/*
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* Do +/- and +@/-@ checking. This looks really nasty,
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* but it matches SunOS's behavior so far as I can tell.
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*/
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switch(buf[0]) {
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case '+':
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if (!buf[1]) { /* '+' matches all hosts */
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hostok = 1;
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break;
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}
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if (buf[1] == '@') /* match a host by netgroup */
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hostok = innetgr((char *)&buf[2],
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(char *)&hname, NULL, ypdomain);
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else /* match a host by addr */
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hostok = __icheckhost(raddr,(char *)&buf[1]);
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break;
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case '-': /* reject '-' hosts and all their users */
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if (buf[1] == '@') {
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if (innetgr((char *)&buf[2],
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(char *)&hname, NULL, ypdomain))
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return(-1);
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} else {
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if (__icheckhost(raddr,(char *)&buf[1]))
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return(-1);
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}
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break;
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default: /* if no '+' or '-', do a simple match */
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hostok = __icheckhost(raddr, buf);
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break;
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}
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switch(*user) {
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case '+':
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if (!*(user+1)) { /* '+' matches all users */
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userok = 1;
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break;
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}
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if (*(user+1) == '@') /* match a user by netgroup */
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userok = innetgr(user+2, NULL, ruser, ypdomain);
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else /* match a user by direct specification */
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userok = !(strcmp(ruser, user+1));
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break;
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case '-': /* if we matched a hostname, */
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if (hostok) { /* check for user field rejections */
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if (!*(user+1))
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return(-1);
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if (*(user+1) == '@') {
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if (innetgr(user+2, NULL,
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ruser, ypdomain))
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return(-1);
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} else {
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if (!strcmp(ruser, user+1))
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return(-1);
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}
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}
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break;
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default: /* no rejections: try to match the user */
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if (hostok)
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userok = !(strcmp(ruser,*user ? user : luser));
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break;
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}
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if (hostok && userok)
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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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* 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_long 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_long 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) && (long)(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_long)))
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return (1);
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/* No match. */
|
|
return (0);
|
|
}
|