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)
92 /* Enlarge the buffer. */
94 tmphstbuf = __alloca (hstbuflen);
98 oldmask = sigblock(sigmask(SIGURG));
99 for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
100 s = rresvport(&lport);
103 (void)fprintf(stderr,
104 _("rcmd: socket: All ports in use\n"));
106 (void)fprintf(stderr, "rcmd: socket: %m\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: %m\n", hp->h_name);
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): %m\n"));
168 if (select(1 + (s > s2 ? s : s2), &reads, 0, 0, 0) < 1 ||
169 !FD_ISSET(s2, &reads)) {
171 (void)fprintf(stderr,
172 _("rcmd: select (setting up stderr): %m\n"));
174 (void)fprintf(stderr,
175 _("select: protocol failure in circuit setup\n"));
179 s3 = accept(s2, (struct sockaddr *)&from, &len);
182 (void)fprintf(stderr,
183 "rcmd: accept: %m\n");
188 from.sin_port = ntohs((u_short)from.sin_port);
189 if (from.sin_family != AF_INET ||
190 from.sin_port >= IPPORT_RESERVED ||
191 from.sin_port < IPPORT_RESERVED / 2) {
192 (void)fprintf(stderr,
193 _("socket: protocol failure in circuit setup\n"));
197 (void)write(s, locuser, strlen(locuser)+1);
198 (void)write(s, remuser, strlen(remuser)+1);
199 (void)write(s, cmd, strlen(cmd)+1);
200 if (read(s, &c, 1) != 1) {
201 (void)fprintf(stderr,
202 "rcmd: %s: %m\n", *ahost);
206 while (read(s, &c, 1) == 1) {
207 (void)write(STDERR_FILENO, &c, 1);
228 struct sockaddr_in sin;
231 sin.sin_family = AF_INET;
232 sin.sin_addr.s_addr = INADDR_ANY;
233 s = socket(AF_INET, SOCK_STREAM, 0);
237 sin.sin_port = htons((u_short)*alport);
238 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
240 if (errno != EADDRINUSE) {
245 if (*alport == IPPORT_RESERVED/2) {
247 __set_errno (EAGAIN); /* close */
253 int __check_rhosts_file = 1;
257 ruserok(rhost, superuser, ruser, luser)
258 const char *rhost, *ruser, *luser;
261 struct hostent hostbuf, *hp;
269 buffer = __alloca (buflen);
271 while (__gethostbyname_r (rhost, &hostbuf, buffer, buflen, &hp, &herr)
273 if (herr != NETDB_INTERNAL || errno != ERANGE)
277 /* Enlarge the buffer. */
279 buffer = __alloca (buflen);
282 for (ap = hp->h_addr_list; *ap; ++ap) {
283 bcopy(*ap, &addr, sizeof(addr));
284 if (iruserok(addr, superuser, ruser, luser) == 0)
291 * New .rhosts strategy: We are passed an ip address. We spin through
292 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
293 * has ip addresses, we don't have to trust a nameserver. When it
294 * contains hostnames, we spin through the list of addresses the nameserver
295 * gives us and look for a match.
297 * Returns 0 if ok, -1 if not ok.
300 iruserok(raddr, superuser, ruser, luser)
303 const char *ruser, *luser;
307 struct passwd pwdbuf, *pwd;
313 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
316 if (__ivaliduser(hostf, raddr, luser, ruser) == 0) {
322 if (first == 1 && (__check_rhosts_file || superuser)) {
325 size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);
326 char *buffer = __alloca (buflen);
329 if (getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) < 0)
332 dirlen = strlen (pwd->pw_dir);
333 pbuf = alloca (dirlen + sizeof "/.rhosts");
334 memcpy (pbuf, pwd->pw_dir, dirlen);
335 memcpy (pbuf + dirlen, "/.rhosts", sizeof "/.rhosts");
338 * Change effective uid while opening .rhosts. If root and
339 * reading an NFS mounted file system, can't read files that
340 * are protected read/write owner only.
342 if (euidaccess (pbuf, R_OK) != 0)
345 hostf = fopen(pbuf, "r");
350 * If not a regular file, or is owned by someone other than
351 * user or root or if writeable by anyone but the owner, quit.
354 if (lstat(pbuf, &sbuf) < 0)
355 cp = _(".rhosts lstat failed");
356 else if (!S_ISREG(sbuf.st_mode))
357 cp = _(".rhosts not regular file");
358 else if (fstat(fileno(hostf), &sbuf) < 0)
359 cp = _(".rhosts fstat failed");
360 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
361 cp = _("bad .rhosts owner");
362 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
363 cp = _(".rhosts writeable by other than owner");
364 /* If there were any problems, quit. */
377 * Don't make static, used by lpd(8).
379 * Returns 0 if ok, -1 if not ok.
382 __ivaliduser(hostf, raddr, luser, ruser)
385 const char *luser, *ruser;
387 register char *user, *p;
393 while ((nread = __getline (&buf, &bufsize, hostf)) > 0) {
394 buf[bufsize - 1] = '\0'; /* Make sure it's terminated. */
396 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
397 *p = isupper(*p) ? tolower(*p) : *p;
400 if (*p == ' ' || *p == '\t') {
402 while (*p == ' ' || *p == '\t')
405 while (*p != '\n' && *p != ' ' &&
406 *p != '\t' && *p != '\0')
411 if (__icheckhost(raddr, buf) &&
412 strcmp(ruser, *user ? user : luser) == 0) {
422 * Returns "true" if match, 0 if no match.
425 __icheckhost(raddr, lhost)
427 register char *lhost;
429 register struct hostent hostbuf, *hp;
432 register u_int32_t laddr;
436 /* Try for raw ip address first. */
437 if (isdigit(*lhost) && (int32_t)(laddr = inet_addr(lhost)) != -1)
438 return (raddr == laddr);
440 /* Better be a hostname. */
442 buffer = __alloca (buflen);
443 while (__gethostbyname_r (lhost, &hostbuf, buffer, buflen, &hp, &herr)
445 if (herr != NETDB_INTERNAL || errno != ERANGE)
449 /* Enlarge the buffer. */
451 buflen = __alloca (buflen);
454 /* Spin through ip addresses. */
455 for (pp = hp->h_addr_list; *pp; ++pp)
456 if (!bcmp(&raddr, *pp, sizeof(u_int32_t)))