2 * Copyright (c) 1983, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";
36 #endif /* LIBC_SCCS and not lint */
38 #include <sys/param.h>
39 #include <sys/socket.h>
42 #include <netinet/in.h>
43 #include <arpa/inet.h>
57 int __ivaliduser __P((FILE *, u_int32_t, const char *, const char *));
58 static int __icheckhost __P((u_int32_t, char *));
61 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
64 const char *locuser, *remuser, *cmd;
67 struct hostent hostbuf, *hp;
70 struct sockaddr_in sin, from;
81 tmphstbuf = __alloca (hstbuflen);
82 while (__gethostbyname_r (*ahost, &hostbuf, tmphstbuf, hstbuflen,
84 if (herr != NETDB_INTERNAL || errno != ERANGE)
91 /* Enlarge the buffer. */
93 tmphstbuf = __alloca (hstbuflen);
97 oldmask = sigblock(sigmask(SIGURG));
98 for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
99 s = rresvport(&lport);
102 (void)fprintf(stderr,
103 _("rcmd: socket: All ports in use\n"));
105 (void)fprintf(stderr, "rcmd: socket: %s\n",
110 fcntl(s, F_SETOWN, pid);
111 sin.sin_family = hp->h_addrtype;
112 bcopy(hp->h_addr_list[0], &sin.sin_addr,
113 MIN (sizeof (sin.sin_addr), hp->h_length));
114 sin.sin_port = rport;
115 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
118 if (errno == EADDRINUSE) {
122 if (errno == ECONNREFUSED && timo <= 16) {
127 if (hp->h_addr_list[1] != NULL) {
130 (void)fprintf(stderr, _("connect to address %s: "),
131 inet_ntoa(sin.sin_addr));
132 __set_errno (oerrno);
135 bcopy(hp->h_addr_list[0], &sin.sin_addr,
136 MIN (sizeof (sin.sin_addr), hp->h_length));
137 (void)fprintf(stderr, _("Trying %s...\n"),
138 inet_ntoa(sin.sin_addr));
141 (void)fprintf(stderr, "%s: %s\n", hp->h_name, strerror(errno));
151 int s2 = rresvport(&lport), s3;
152 int len = sizeof(from);
157 (void)snprintf(num, sizeof(num), "%d", lport);
158 if (write(s, num, strlen(num)+1) != strlen(num)+1) {
159 (void)fprintf(stderr,
160 _("rcmd: write (setting up stderr): %s\n"),
169 if (select(1 + (s > s2 ? s : s2), &reads, 0, 0, 0) < 1 ||
170 !FD_ISSET(s2, &reads)) {
172 (void)fprintf(stderr,
173 _("rcmd: select (setting up stderr): %s\n"),
176 (void)fprintf(stderr,
177 _("select: protocol failure in circuit setup\n"));
181 s3 = accept(s2, (struct sockaddr *)&from, &len);
184 (void)fprintf(stderr,
185 "rcmd: accept: %s\n", strerror(errno));
190 from.sin_port = ntohs((u_short)from.sin_port);
191 if (from.sin_family != AF_INET ||
192 from.sin_port >= IPPORT_RESERVED ||
193 from.sin_port < IPPORT_RESERVED / 2) {
194 (void)fprintf(stderr,
195 _("socket: protocol failure in circuit setup\n"));
199 (void)write(s, locuser, strlen(locuser)+1);
200 (void)write(s, remuser, strlen(remuser)+1);
201 (void)write(s, cmd, strlen(cmd)+1);
202 if (read(s, &c, 1) != 1) {
203 (void)fprintf(stderr,
204 "rcmd: %s: %s\n", *ahost, strerror(errno));
208 while (read(s, &c, 1) == 1) {
209 (void)write(STDERR_FILENO, &c, 1);
230 struct sockaddr_in sin;
233 sin.sin_family = AF_INET;
234 sin.sin_addr.s_addr = INADDR_ANY;
235 s = socket(AF_INET, SOCK_STREAM, 0);
239 sin.sin_port = htons((u_short)*alport);
240 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
242 if (errno != EADDRINUSE) {
247 if (*alport == IPPORT_RESERVED/2) {
249 __set_errno (EAGAIN); /* close */
255 int __check_rhosts_file = 1;
259 ruserok(rhost, superuser, ruser, luser)
260 const char *rhost, *ruser, *luser;
263 struct hostent hostbuf, *hp;
271 buffer = __alloca (buflen);
273 while (__gethostbyname_r (rhost, &hostbuf, buffer, buflen, &hp, &herr)
275 if (herr != NETDB_INTERNAL || errno != ERANGE)
279 /* Enlarge the buffer. */
281 buffer = __alloca (buflen);
284 for (ap = hp->h_addr_list; *ap; ++ap) {
285 bcopy(*ap, &addr, sizeof(addr));
286 if (iruserok(addr, superuser, ruser, luser) == 0)
293 * New .rhosts strategy: We are passed an ip address. We spin through
294 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
295 * has ip addresses, we don't have to trust a nameserver. When it
296 * contains hostnames, we spin through the list of addresses the nameserver
297 * gives us and look for a match.
299 * Returns 0 if ok, -1 if not ok.
302 iruserok(raddr, superuser, ruser, luser)
305 const char *ruser, *luser;
309 struct passwd pwdbuf, *pwd;
315 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
318 if (__ivaliduser(hostf, raddr, luser, ruser) == 0) {
324 if (first == 1 && (__check_rhosts_file || superuser)) {
327 size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
328 char buffer = __alloca (buflen);
331 if (getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) < 0)
334 dirlen = strlen (pwd->pw_dir);
335 pbuf = alloca (dirlen + sizeof "/.rhosts");
336 memcpy (pbuf, pwd->pw_dir, dirlen);
337 memcpy (pbuf + dirlen, "/.rhosts", sizeof "/.rhosts");
340 * Change effective uid while opening .rhosts. If root and
341 * reading an NFS mounted file system, can't read files that
342 * are protected read/write owner only.
345 (void)seteuid(pwd->pw_uid);
346 hostf = fopen(pbuf, "r");
352 * If not a regular file, or is owned by someone other than
353 * user or root or if writeable by anyone but the owner, quit.
356 if (lstat(pbuf, &sbuf) < 0)
357 cp = _(".rhosts lstat failed");
358 else if (!S_ISREG(sbuf.st_mode))
359 cp = _(".rhosts not regular file");
360 else if (fstat(fileno(hostf), &sbuf) < 0)
361 cp = _(".rhosts fstat failed");
362 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
363 cp = _("bad .rhosts owner");
364 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
365 cp = _(".rhosts writeable by other than owner");
366 /* If there were any problems, quit. */
379 * Don't make static, used by lpd(8).
381 * Returns 0 if ok, -1 if not ok.
384 __ivaliduser(hostf, raddr, luser, ruser)
387 const char *luser, *ruser;
389 register char *user, *p;
395 while ((nread = getline (&buf, &bufsize, hostf)) > 0) {
396 buf[bufsize - 1] = '\0'; /* Make sure it's terminated. */
398 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
399 *p = isupper(*p) ? tolower(*p) : *p;
402 if (*p == ' ' || *p == '\t') {
404 while (*p == ' ' || *p == '\t')
407 while (*p != '\n' && *p != ' ' &&
408 *p != '\t' && *p != '\0')
413 if (__icheckhost(raddr, buf) &&
414 strcmp(ruser, *user ? user : luser) == 0) {
424 * Returns "true" if match, 0 if no match.
427 __icheckhost(raddr, lhost)
429 register char *lhost;
431 register struct hostent hostbuf, *hp;
434 register u_int32_t laddr;
438 /* Try for raw ip address first. */
439 if (isdigit(*lhost) && (int32_t)(laddr = inet_addr(lhost)) != -1)
440 return (raddr == laddr);
442 /* Better be a hostname. */
444 buffer = __alloca (buflen);
445 while (__gethostbyname_r (lhost, &hostbuf, buffer, buflen, &hp, &herr)
447 if (herr != NETDB_INTERNAL || errno != ERANGE)
451 /* Enlarge the buffer. */
453 buflen = __alloca (buflen);
456 /* Spin through ip addresses. */
457 for (pp = hp->h_addr_list; *pp; ++pp)
458 if (!bcmp(&raddr, *pp, sizeof(u_int32_t)))