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: %m\n");
109 fcntl(s, F_SETOWN, pid);
110 sin.sin_family = hp->h_addrtype;
111 bcopy(hp->h_addr_list[0], &sin.sin_addr,
112 MIN (sizeof (sin.sin_addr), hp->h_length));
113 sin.sin_port = rport;
114 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
117 if (errno == EADDRINUSE) {
121 if (errno == ECONNREFUSED && timo <= 16) {
126 if (hp->h_addr_list[1] != NULL) {
129 (void)fprintf(stderr, _("connect to address %s: "),
130 inet_ntoa(sin.sin_addr));
131 __set_errno (oerrno);
134 bcopy(hp->h_addr_list[0], &sin.sin_addr,
135 MIN (sizeof (sin.sin_addr), hp->h_length));
136 (void)fprintf(stderr, _("Trying %s...\n"),
137 inet_ntoa(sin.sin_addr));
140 (void)fprintf(stderr, "%s: %m\n", hp->h_name);
150 int s2 = rresvport(&lport), s3;
151 int len = sizeof(from);
156 (void)snprintf(num, sizeof(num), "%d", lport);
157 if (write(s, num, strlen(num)+1) != strlen(num)+1) {
158 (void)fprintf(stderr,
159 _("rcmd: write (setting up stderr): %m\n"));
167 if (select(1 + (s > s2 ? s : s2), &reads, 0, 0, 0) < 1 ||
168 !FD_ISSET(s2, &reads)) {
170 (void)fprintf(stderr,
171 _("rcmd: select (setting up stderr): %m\n"));
173 (void)fprintf(stderr,
174 _("select: protocol failure in circuit setup\n"));
178 s3 = accept(s2, (struct sockaddr *)&from, &len);
181 (void)fprintf(stderr,
182 "rcmd: accept: %m\n");
187 from.sin_port = ntohs((u_short)from.sin_port);
188 if (from.sin_family != AF_INET ||
189 from.sin_port >= IPPORT_RESERVED ||
190 from.sin_port < IPPORT_RESERVED / 2) {
191 (void)fprintf(stderr,
192 _("socket: protocol failure in circuit setup\n"));
196 (void)write(s, locuser, strlen(locuser)+1);
197 (void)write(s, remuser, strlen(remuser)+1);
198 (void)write(s, cmd, strlen(cmd)+1);
199 if (read(s, &c, 1) != 1) {
200 (void)fprintf(stderr,
201 "rcmd: %s: %m\n", *ahost);
205 while (read(s, &c, 1) == 1) {
206 (void)write(STDERR_FILENO, &c, 1);
227 struct sockaddr_in sin;
230 sin.sin_family = AF_INET;
231 sin.sin_addr.s_addr = INADDR_ANY;
232 s = socket(AF_INET, SOCK_STREAM, 0);
236 sin.sin_port = htons((u_short)*alport);
237 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
239 if (errno != EADDRINUSE) {
244 if (*alport == IPPORT_RESERVED/2) {
246 __set_errno (EAGAIN); /* close */
252 int __check_rhosts_file = 1;
256 ruserok(rhost, superuser, ruser, luser)
257 const char *rhost, *ruser, *luser;
260 struct hostent hostbuf, *hp;
268 buffer = __alloca (buflen);
270 while (__gethostbyname_r (rhost, &hostbuf, buffer, buflen, &hp, &herr)
272 if (herr != NETDB_INTERNAL || errno != ERANGE)
276 /* Enlarge the buffer. */
278 buffer = __alloca (buflen);
281 for (ap = hp->h_addr_list; *ap; ++ap) {
282 bcopy(*ap, &addr, sizeof(addr));
283 if (iruserok(addr, superuser, ruser, luser) == 0)
290 * New .rhosts strategy: We are passed an ip address. We spin through
291 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
292 * has ip addresses, we don't have to trust a nameserver. When it
293 * contains hostnames, we spin through the list of addresses the nameserver
294 * gives us and look for a match.
296 * Returns 0 if ok, -1 if not ok.
299 iruserok(raddr, superuser, ruser, luser)
302 const char *ruser, *luser;
306 struct passwd pwdbuf, *pwd;
312 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
315 if (__ivaliduser(hostf, raddr, luser, ruser) == 0) {
321 if (first == 1 && (__check_rhosts_file || superuser)) {
324 size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
325 char buffer = __alloca (buflen);
328 if (getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) < 0)
331 dirlen = strlen (pwd->pw_dir);
332 pbuf = alloca (dirlen + sizeof "/.rhosts");
333 memcpy (pbuf, pwd->pw_dir, dirlen);
334 memcpy (pbuf + dirlen, "/.rhosts", sizeof "/.rhosts");
337 * Change effective uid while opening .rhosts. If root and
338 * reading an NFS mounted file system, can't read files that
339 * are protected read/write owner only.
342 (void)seteuid(pwd->pw_uid);
343 hostf = fopen(pbuf, "r");
349 * If not a regular file, or is owned by someone other than
350 * user or root or if writeable by anyone but the owner, quit.
353 if (lstat(pbuf, &sbuf) < 0)
354 cp = _(".rhosts lstat failed");
355 else if (!S_ISREG(sbuf.st_mode))
356 cp = _(".rhosts not regular file");
357 else if (fstat(fileno(hostf), &sbuf) < 0)
358 cp = _(".rhosts fstat failed");
359 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
360 cp = _("bad .rhosts owner");
361 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
362 cp = _(".rhosts writeable by other than owner");
363 /* If there were any problems, quit. */
376 * Don't make static, used by lpd(8).
378 * Returns 0 if ok, -1 if not ok.
381 __ivaliduser(hostf, raddr, luser, ruser)
384 const char *luser, *ruser;
386 register char *user, *p;
392 while ((nread = getline (&buf, &bufsize, hostf)) > 0) {
393 buf[bufsize - 1] = '\0'; /* Make sure it's terminated. */
395 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
396 *p = isupper(*p) ? tolower(*p) : *p;
399 if (*p == ' ' || *p == '\t') {
401 while (*p == ' ' || *p == '\t')
404 while (*p != '\n' && *p != ' ' &&
405 *p != '\t' && *p != '\0')
410 if (__icheckhost(raddr, buf) &&
411 strcmp(ruser, *user ? user : luser) == 0) {
421 * Returns "true" if match, 0 if no match.
424 __icheckhost(raddr, lhost)
426 register char *lhost;
428 register struct hostent hostbuf, *hp;
431 register u_int32_t laddr;
435 /* Try for raw ip address first. */
436 if (isdigit(*lhost) && (int32_t)(laddr = inet_addr(lhost)) != -1)
437 return (raddr == laddr);
439 /* Better be a hostname. */
441 buffer = __alloca (buflen);
442 while (__gethostbyname_r (lhost, &hostbuf, buffer, buflen, &hp, &herr)
444 if (herr != NETDB_INTERNAL || errno != ERANGE)
448 /* Enlarge the buffer. */
450 buflen = __alloca (buflen);
453 /* Spin through ip addresses. */
454 for (pp = hp->h_addr_list; *pp; ++pp)
455 if (!bcmp(&raddr, *pp, sizeof(u_int32_t)))