469bed11ef
-changed bindresvport2 to bindresvport_sa -merged the man into bindresvport.3 All discussion between Jean-Luc Richier <Jean-Luc.Richier@imag.fr>, Theo de Raadt <deraadt@cvs.openbsd.org>, itojun, is reflected to this code. (Actually Theo de Raadt write the code simultaneously as the discussion change.)
661 lines
16 KiB
C
661 lines
16 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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* $FreeBSD$
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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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/* wrapper for KAME-special getnameinfo() */
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#ifndef NI_WITHSCOPEID
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#define NI_WITHSCOPEID 0
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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_int32_t, const char *, const char *));
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static int __icheckhost __P((void *, char *, int, int));
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char paddr[INET6_ADDRSTRLEN];
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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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return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
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}
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int
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rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
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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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int af;
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{
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struct addrinfo hints, *res, *ai;
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struct sockaddr_storage 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, aport, lport, timo, error;
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char c;
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int refused;
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char num[8];
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pid = getpid();
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memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_CANONNAME;
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hints.ai_family = af;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = 0;
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(void)snprintf(num, sizeof(num), "%d", ntohs(rport));
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error = getaddrinfo(*ahost, num, &hints, &res);
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if (error) {
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fprintf(stderr, "rcmd: getaddrinfo: %s\n",
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gai_strerror(error));
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if (error == EAI_SYSTEM)
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fprintf(stderr, "rcmd: getaddrinfo: %s\n",
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strerror(errno));
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return (-1);
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}
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if (res->ai_canonname)
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*ahost = res->ai_canonname;
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ai = res;
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refused = 0;
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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_af(&lport, ai->ai_family);
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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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freeaddrinfo(res);
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return (-1);
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}
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_libc_fcntl(s, F_SETOWN, pid);
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if (connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
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break;
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(void)_libc_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)
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refused = 1;
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if (ai->ai_next != NULL) {
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int oerrno = errno;
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getnameinfo(ai->ai_addr, ai->ai_addrlen,
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paddr, sizeof(paddr),
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NULL, 0,
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NI_NUMERICHOST|NI_WITHSCOPEID);
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(void)fprintf(stderr, "connect to address %s: ",
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paddr);
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errno = oerrno;
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perror(0);
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ai = ai->ai_next;
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getnameinfo(ai->ai_addr, ai->ai_addrlen,
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paddr, sizeof(paddr),
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NULL, 0,
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NI_NUMERICHOST|NI_WITHSCOPEID);
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fprintf(stderr, "Trying %s...\n", paddr);
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continue;
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}
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if (refused && timo <= 16) {
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(void)_libc_sleep(timo);
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timo *= 2;
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ai = res;
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refused = 0;
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continue;
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}
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freeaddrinfo(res);
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(void)fprintf(stderr, "%s: %s\n", *ahost, 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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_libc_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_af(&lport, ai->ai_family), s3;
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int len = ai->ai_addrlen;
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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 (_libc_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)_libc_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)_libc_close(s2);
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goto bad;
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}
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again:
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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)_libc_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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switch (from.ss_family) {
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case AF_INET:
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aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
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break;
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#ifdef INET6
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case AF_INET6:
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aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
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break;
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#endif
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default:
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aport = 0; /* error */
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break;
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}
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/*
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* XXX careful for ftp bounce attacks. If discovered, shut them
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* down and check for the real auxiliary channel to connect.
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*/
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if (aport == 20) {
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_libc_close(s3);
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goto again;
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}
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(void)_libc_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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if (aport >= IPPORT_RESERVED || aport < 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)_libc_write(s, locuser, strlen(locuser)+1);
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(void)_libc_write(s, remuser, strlen(remuser)+1);
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(void)_libc_write(s, cmd, strlen(cmd)+1);
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if (_libc_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 (_libc_read(s, &c, 1) == 1) {
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(void)_libc_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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freeaddrinfo(res);
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return (s);
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bad2:
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if (lport)
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(void)_libc_close(*fd2p);
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bad:
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(void)_libc_close(s);
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sigsetmask(oldmask);
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freeaddrinfo(res);
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return (-1);
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}
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int
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rresvport(port)
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int *port;
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{
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return rresvport_af(port, AF_INET);
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}
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int
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rresvport_af(alport, family)
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int *alport, family;
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{
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int i, s, len, err;
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struct sockaddr_storage ss;
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u_short *sport;
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memset(&ss, 0, sizeof(ss));
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ss.ss_family = family;
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switch (family) {
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case AF_INET:
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((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
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sport = &((struct sockaddr_in *)&ss)->sin_port;
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((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
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break;
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#ifdef INET6
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case AF_INET6:
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((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
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sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
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((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
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break;
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#endif
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default:
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errno = EAFNOSUPPORT;
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return -1;
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}
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s = socket(ss.ss_family, SOCK_STREAM, 0);
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if (s < 0)
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return (-1);
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#if 0 /* compat_exact_traditional_rresvport_semantics */
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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)_libc_close(s);
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return (-1);
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}
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#endif
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*sport = 0;
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if (bindresvport_sa(s, (struct sockaddr *)&ss,
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((struct sockaddr *)&ss)->sa_len) == -1) {
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(void)_libc_close(s);
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return (-1);
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}
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*alport = (int)ntohs(*sport);
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return (s);
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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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return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
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}
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int
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ruserok_af(rhost, superuser, ruser, luser, af)
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const char *rhost, *ruser, *luser;
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int superuser, af;
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{
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struct hostent *hp;
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union {
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struct in_addr addr_in;
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struct in6_addr addr_in6;
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} addr;
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char **ap;
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int ret, h_error;
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if ((hp = getipnodebyname(rhost, af, AI_DEFAULT, &h_error)) == NULL)
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return (-1);
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ret = -1;
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for (ap = hp->h_addr_list; *ap; ++ap) {
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bcopy(*ap, &addr, hp->h_length);
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if (iruserok_af(&addr, superuser, ruser, luser, af) == 0) {
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ret = 0;
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break;
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}
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}
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freehostent(hp);
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return (ret);
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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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unsigned long raddr;
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int superuser;
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const char *ruser, *luser;
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{
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return iruserok_af(&raddr, superuser, ruser, luser, AF_INET);
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}
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int
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iruserok_af(raddr, superuser, ruser, luser, af)
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void *raddr;
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int superuser;
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const char *ruser, *luser;
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int af;
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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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int len = 0;
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switch (af) {
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case AF_INET:
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len = sizeof(struct in_addr);
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break;
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#ifdef INET6
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case AF_INET6:
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len = sizeof(struct in6_addr);
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break;
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#endif
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}
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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_af(hostf, raddr, luser, ruser, af, len)
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== 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_int32_t raddr;
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const char *luser, *ruser;
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{
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return __ivaliduser_af(hostf, &raddr, luser, ruser, AF_INET,
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sizeof(raddr));
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}
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int
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__ivaliduser_af(hostf, raddr, luser, ruser, af, len)
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FILE *hostf;
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void *raddr;
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const char *luser, *ruser;
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int af, len;
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{
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register char *user, *p;
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int ch;
|
|
char buf[MAXHOSTNAMELEN + 128]; /* host + login */
|
|
char hname[MAXHOSTNAMELEN];
|
|
struct hostent *hp;
|
|
/* Presumed guilty until proven innocent. */
|
|
int userok = 0, hostok = 0;
|
|
int h_error;
|
|
#ifdef YP
|
|
char *ypdomain;
|
|
|
|
if (yp_get_default_domain(&ypdomain))
|
|
ypdomain = NULL;
|
|
#else
|
|
#define ypdomain NULL
|
|
#endif
|
|
/* We need to get the damn hostname back for netgroup matching. */
|
|
if ((hp = getipnodebyaddr((char *)raddr, len, af, &h_error)) == NULL)
|
|
return (-1);
|
|
strncpy(hname, hp->h_name, sizeof(hname));
|
|
hname[sizeof(hname) - 1] = '\0';
|
|
freehostent(hp);
|
|
|
|
while (fgets(buf, sizeof(buf), hostf)) {
|
|
p = buf;
|
|
/* Skip lines that are too long. */
|
|
if (strchr(p, '\n') == NULL) {
|
|
while ((ch = getc(hostf)) != '\n' && ch != EOF);
|
|
continue;
|
|
}
|
|
if (*p == '\n' || *p == '#') {
|
|
/* comment... */
|
|
continue;
|
|
}
|
|
while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
|
|
*p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
|
|
p++;
|
|
}
|
|
if (*p == ' ' || *p == '\t') {
|
|
*p++ = '\0';
|
|
while (*p == ' ' || *p == '\t')
|
|
p++;
|
|
user = p;
|
|
while (*p != '\n' && *p != ' ' &&
|
|
*p != '\t' && *p != '\0')
|
|
p++;
|
|
} else
|
|
user = p;
|
|
*p = '\0';
|
|
/*
|
|
* Do +/- and +@/-@ checking. This looks really nasty,
|
|
* but it matches SunOS's behavior so far as I can tell.
|
|
*/
|
|
switch(buf[0]) {
|
|
case '+':
|
|
if (!buf[1]) { /* '+' matches all hosts */
|
|
hostok = 1;
|
|
break;
|
|
}
|
|
if (buf[1] == '@') /* match a host by netgroup */
|
|
hostok = innetgr((char *)&buf[2],
|
|
(char *)&hname, NULL, ypdomain);
|
|
else /* match a host by addr */
|
|
hostok = __icheckhost(raddr,(char *)&buf[1],
|
|
af, len);
|
|
break;
|
|
case '-': /* reject '-' hosts and all their users */
|
|
if (buf[1] == '@') {
|
|
if (innetgr((char *)&buf[2],
|
|
(char *)&hname, NULL, ypdomain))
|
|
return(-1);
|
|
} else {
|
|
if (__icheckhost(raddr,(char *)&buf[1],af,len))
|
|
return(-1);
|
|
}
|
|
break;
|
|
default: /* if no '+' or '-', do a simple match */
|
|
hostok = __icheckhost(raddr, buf, af, len);
|
|
break;
|
|
}
|
|
switch(*user) {
|
|
case '+':
|
|
if (!*(user+1)) { /* '+' matches all users */
|
|
userok = 1;
|
|
break;
|
|
}
|
|
if (*(user+1) == '@') /* match a user by netgroup */
|
|
userok = innetgr(user+2, NULL, ruser, ypdomain);
|
|
else /* match a user by direct specification */
|
|
userok = !(strcmp(ruser, user+1));
|
|
break;
|
|
case '-': /* if we matched a hostname, */
|
|
if (hostok) { /* check for user field rejections */
|
|
if (!*(user+1))
|
|
return(-1);
|
|
if (*(user+1) == '@') {
|
|
if (innetgr(user+2, NULL,
|
|
ruser, ypdomain))
|
|
return(-1);
|
|
} else {
|
|
if (!strcmp(ruser, user+1))
|
|
return(-1);
|
|
}
|
|
}
|
|
break;
|
|
default: /* no rejections: try to match the user */
|
|
if (hostok)
|
|
userok = !(strcmp(ruser,*user ? user : luser));
|
|
break;
|
|
}
|
|
if (hostok && userok)
|
|
return(0);
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Returns "true" if match, 0 if no match.
|
|
*/
|
|
static int
|
|
__icheckhost(raddr, lhost, af, len)
|
|
void *raddr;
|
|
register char *lhost;
|
|
int af, len;
|
|
{
|
|
register struct hostent *hp;
|
|
char laddr[BUFSIZ]; /* xxx */
|
|
register char **pp;
|
|
int h_error;
|
|
int match;
|
|
|
|
/* Try for raw ip address first. */
|
|
if (inet_pton(af, lhost, laddr) == 1) {
|
|
if (memcmp(raddr, laddr, len) == 0)
|
|
return (1);
|
|
else
|
|
return (0);
|
|
}
|
|
|
|
/* Better be a hostname. */
|
|
if ((hp = getipnodebyname(lhost, af, AI_DEFAULT, &h_error)) == NULL)
|
|
return (0);
|
|
|
|
/* Spin through ip addresses. */
|
|
match = 0;
|
|
for (pp = hp->h_addr_list; *pp; ++pp)
|
|
if (!bcmp(raddr, *pp, len)) {
|
|
match = 1;
|
|
break;
|
|
}
|
|
|
|
freehostent(hp);
|
|
return (match);
|
|
}
|