2 * Copyright (C) 1998 WIDE Project.
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. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * Copyright (c) 1983, 1993, 1994
31 * The Regents of the University of California. All rights reserved.
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
36 * 1. Redistributions of source code must retain the above copyright
37 * notice, this list of conditions and the following disclaimer.
38 * 2. Redistributions in binary form must reproduce the above copyright
39 * notice, this list of conditions and the following disclaimer in the
40 * documentation and/or other materials provided with the distribution.
41 * 4. Neither the name of the University nor the names of its contributors
42 * may be used to endorse or promote products derived from this software
43 * without specific prior written permission.
45 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";
60 #endif /* LIBC_SCCS and not lint */
62 #define __UCLIBC_HIDE_DEPRECATED__
64 #include <sys/param.h>
66 #include <sys/socket.h>
68 #include <sys/types.h>
70 #include <netinet/in.h>
71 #include <arpa/inet.h>
80 #include <stdio_ext.h>
85 #ifdef __UCLIBC_HAS_WCHAR__
91 #define _PATH_HEQUIV "/etc/hosts.equiv"
94 int rresvport(int *alport);
96 /* some forward declarations */
97 static int __ivaliduser2(FILE *hostf, u_int32_t raddr,
98 const char *luser, const char *ruser, const char *rhost);
99 static int iruserok2 (u_int32_t raddr, int superuser, const char *ruser,
100 const char *luser, const char *rhost);
103 int rcmd(char **ahost, u_short rport, const char *locuser, const char *remuser,
104 const char *cmd, int *fd2p)
106 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
108 struct hostent hostbuf;
113 struct sockaddr_in sin, from;
114 struct pollfd pfd[2];
122 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
124 tmphstbuf = stack_heap_alloc(hstbuflen);
126 while (gethostbyname_r (*ahost, &hostbuf, tmphstbuf,
127 hstbuflen, &hp, &herr) != 0 || hp == NULL)
129 if (herr != NETDB_INTERNAL || errno != ERANGE)
131 __set_h_errno (herr);
132 stack_heap_free(tmphstbuf);
138 /* Enlarge the buffer. */
140 stack_heap_free(tmphstbuf);
141 tmphstbuf = stack_heap_alloc(hstbuflen);
144 stack_heap_free(tmphstbuf);
145 #else /* call the non-reentrant version */
146 if ((hp = gethostbyname(*ahost)) == NULL) {
150 pfd[0].events = POLLIN;
151 pfd[1].events = POLLIN;
155 sigaddset(&sig, SIGURG);
156 sigprocmask(SIG_BLOCK, &sig, &osig);
157 for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
158 s = rresvport(&lport);
161 (void)fprintf(stderr,
162 "rcmd: socket: All ports in use\n");
164 (void)fprintf(stderr, "rcmd: socket: %m\n");
165 sigprocmask(SIG_SETMASK, &osig, NULL);
168 fcntl(s, F_SETOWN, pid);
169 sin.sin_family = hp->h_addrtype;
170 memmove(&sin.sin_addr, hp->h_addr_list[0],
171 MIN (sizeof (sin.sin_addr), hp->h_length));
172 sin.sin_port = rport;
173 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) /* __connect */
176 if (errno == EADDRINUSE) {
180 if (errno == ECONNREFUSED && timo <= 16) {
181 (void)sleep(timo); /* __sleep */
185 if (hp->h_addr_list[1] != NULL) {
188 (void)fprintf(stderr, "connect to address %s: ",
189 inet_ntoa(sin.sin_addr));
190 __set_errno (oerrno);
193 memmove(&sin.sin_addr, hp->h_addr_list[0],
194 MIN (sizeof (sin.sin_addr), hp->h_length));
195 (void)fprintf(stderr, "Trying %s...\n",
196 inet_ntoa(sin.sin_addr));
199 (void)fprintf(stderr, "%s: %m\n", hp->h_name);
200 sigprocmask(SIG_SETMASK, &osig, NULL);
209 int s2 = rresvport(&lport), s3;
210 socklen_t len = sizeof(from);
215 (void)snprintf(num, sizeof(num), "%d", lport); /* __snprintf */
216 if (write(s, num, strlen(num)+1) != strlen(num)+1) {
217 (void)fprintf(stderr,
218 "rcmd: write (setting up stderr): %m\n");
225 if (poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){
227 (void)fprintf(stderr, "rcmd: poll (setting up stderr): %m\n");
229 (void)fprintf(stderr, "poll: protocol failure in circuit setup\n");
233 s3 = accept(s2, (struct sockaddr *)&from, &len);
236 (void)fprintf(stderr,
237 "rcmd: accept: %m\n");
242 from.sin_port = ntohs((u_short)from.sin_port);
243 if (from.sin_family != AF_INET ||
244 from.sin_port >= IPPORT_RESERVED ||
245 from.sin_port < IPPORT_RESERVED / 2) {
246 (void)fprintf(stderr,
247 "socket: protocol failure in circuit setup\n");
251 (void)write(s, locuser, strlen(locuser)+1);
252 (void)write(s, remuser, strlen(remuser)+1);
253 (void)write(s, cmd, strlen(cmd)+1);
254 if (read(s, &c, 1) != 1) {
255 (void)fprintf(stderr,
256 "rcmd: %s: %m\n", *ahost);
260 while (read(s, &c, 1) == 1) {
261 (void)write(STDERR_FILENO, &c, 1);
267 sigprocmask(SIG_SETMASK, &osig, NULL);
274 sigprocmask(SIG_SETMASK, &osig, NULL);
278 int rresvport(int *alport)
280 struct sockaddr_in sin;
283 sin.sin_family = AF_INET;
284 sin.sin_addr.s_addr = INADDR_ANY;
285 s = socket(AF_INET, SOCK_STREAM, 0);
289 sin.sin_port = htons((u_short)*alport);
290 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
292 if (errno != EADDRINUSE) {
297 if (*alport == IPPORT_RESERVED/2) {
299 __set_errno (EAGAIN); /* close */
306 libc_hidden_def(rresvport)
308 /* This needs to be exported ... while it is not a documented interface
309 * for rcp related apps, it's a required one that is used to control the
310 * rhost behavior. Legacy sucks.
312 int __check_rhosts_file = 1;
314 int ruserok(const char *rhost, int superuser, const char *ruser,
320 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
324 struct hostent hostbuf;
327 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
329 buffer = stack_heap_alloc(buflen);
331 while (gethostbyname_r (rhost, &hostbuf, buffer,
332 buflen, &hp, &herr) != 0 || hp == NULL)
334 if (herr != NETDB_INTERNAL || errno != ERANGE) {
335 stack_heap_free(buffer);
339 /* Enlarge the buffer. */
341 stack_heap_free(buffer);
342 buffer = stack_heap_alloc(buflen);
345 stack_heap_free(buffer);
347 if ((hp = gethostbyname(rhost)) == NULL) {
351 for (ap = hp->h_addr_list; *ap; ++ap) {
352 memmove(&addr, *ap, sizeof(addr));
353 if (iruserok2(addr, superuser, ruser, luser, rhost) == 0)
360 /* Extremely paranoid file open function. */
362 iruserfopen (const char *file, uid_t okuser)
368 /* If not a regular file, if owned by someone other than user or
369 root, if writeable by anyone but the owner, or if hardlinked
371 if (lstat (file, &st))
373 else if (!S_ISREG (st.st_mode))
374 cp = "not regular file";
377 res = fopen (file, "r");
380 else if (fstat (fileno (res), &st) < 0)
382 else if (st.st_uid && st.st_uid != okuser)
384 else if (st.st_mode & (S_IWGRP|S_IWOTH))
385 cp = "writeable by other than owner";
386 else if (st.st_nlink > 1)
387 cp = "hard linked somewhere";
390 /* If there were any problems, quit. */
403 * New .rhosts strategy: We are passed an ip address. We spin through
404 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
405 * has ip addresses, we don't have to trust a nameserver. When it
406 * contains hostnames, we spin through the list of addresses the nameserver
407 * gives us and look for a match.
409 * Returns 0 if ok, -1 if not ok.
412 iruserok2 (u_int32_t raddr, int superuser, const char *ruser, const char *luser,
419 hostf = iruserfopen (_PATH_HEQUIV, 0);
422 isbad = __ivaliduser2 (hostf, raddr, luser, ruser, rhost);
429 if (__check_rhosts_file || superuser) {
435 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
436 size_t buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
437 struct passwd pwdbuf;
438 char *buffer = stack_heap_alloc(buflen);
440 if (getpwnam_r (luser, &pwdbuf, buffer,
441 buflen, &pwd) != 0 || pwd == NULL)
443 stack_heap_free(buffer);
446 stack_heap_free(buffer);
448 if ((pwd = getpwnam(luser)) == NULL)
452 dirlen = strlen (pwd->pw_dir);
453 pbuf = malloc (dirlen + sizeof "/.rhosts");
454 strcpy (pbuf, pwd->pw_dir);
455 strcat (pbuf, "/.rhosts");
457 /* Change effective uid while reading .rhosts. If root and
458 reading an NFS mounted file system, can't read files that
459 are protected read/write owner only. */
461 seteuid (pwd->pw_uid);
462 hostf = iruserfopen (pbuf, pwd->pw_uid);
466 isbad = __ivaliduser2 (hostf, raddr, luser, ruser, rhost);
476 /* This is the exported version. */
477 int iruserok (u_int32_t raddr, int superuser, const char * ruser, const char * luser);
478 int iruserok (u_int32_t raddr, int superuser, const char * ruser, const char * luser)
480 return iruserok2 (raddr, superuser, ruser, luser, "-");
486 * Don't make static, used by lpd(8).
488 * This function is not used anymore. It is only present because lpd(8)
489 * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
490 * argument. This means that netgroups won't work in .rhost/hosts.equiv
491 * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
493 * Returns 0 if ok, -1 if not ok.
496 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser);
498 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser)
500 return __ivaliduser2(hostf, raddr, luser, ruser, "-");
504 /* Returns 1 on positive match, 0 on no match, -1 on negative match. */
506 __icheckhost (u_int32_t raddr, char *lhost, const char *rhost)
510 int negate=1; /* Multiply return with this to get -1 instead of 1 */
513 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
517 struct hostent hostbuf;
522 /* Check nis netgroup. */
523 if (strncmp ("+@", lhost, 2) == 0)
524 return innetgr (&lhost[2], rhost, NULL, NULL);
526 if (strncmp ("-@", lhost, 2) == 0)
527 return -innetgr (&lhost[2], rhost, NULL, NULL);
528 #endif /* HAVE_NETGROUP */
531 if (strncmp ("-", lhost,1) == 0) {
534 } else if (strcmp ("+",lhost) == 0) {
535 return 1; /* asking for trouble, but ok.. */
538 /* Try for raw ip address first. */
539 if (isdigit (*lhost) && (laddr = inet_addr (lhost)) != INADDR_NONE)
540 return negate * (! (raddr ^ laddr));
542 /* Better be a hostname. */
543 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
545 buffer = malloc(buflen);
548 while (gethostbyname_r (lhost, &hostbuf, buffer, buflen, &hp, &herr)
554 __set_errno (save_errno);
556 hp = gethostbyname(lhost);
557 #endif /* __UCLIBC_HAS_REENTRANT_RPC__ */
562 /* Spin through ip addresses. */
563 for (pp = hp->h_addr_list; *pp; ++pp)
564 if (!memcmp (&raddr, *pp, sizeof (u_int32_t)))
571 /* Returns 1 on positive match, 0 on no match, -1 on negative match. */
573 __icheckuser (const char *luser, const char *ruser)
577 luser is user entry from .rhosts/hosts.equiv file
578 ruser is user id on remote host
583 if (strncmp ("+@", luser, 2) == 0)
584 return innetgr (&luser[2], NULL, ruser, NULL);
586 if (strncmp ("-@", luser,2) == 0)
587 return -innetgr (&luser[2], NULL, ruser, NULL);
588 #endif /* HAVE_NETGROUP */
591 if (strncmp ("-", luser, 1) == 0)
592 return -(strcmp (&luser[1], ruser) == 0);
595 if (strcmp ("+", luser) == 0)
598 /* simple string match */
599 return strcmp (ruser, luser) == 0;
603 * Returns 1 for blank lines (or only comment lines) and 0 otherwise
608 while (*p && isspace (*p)) {
612 return (*p == '\0' || *p == '#') ? 1 : 0 ;
616 * Returns 0 if positive match, -1 if _not_ ok.
619 __ivaliduser2(FILE *hostf, u_int32_t raddr, const char *luser,
620 const char *ruser, const char *rhost)
622 register const char *user;
629 while (getline (&buf, &bufsize, hostf) > 0) {
630 buf[bufsize - 1] = '\0'; /* Make sure it's terminated. */
633 /* Skip empty or comment lines */
638 /* Skip lines that are too long. */
639 if (strchr (p, '\n') == NULL) {
640 int ch = getc_unlocked (hostf);
642 while (ch != '\n' && ch != EOF)
643 ch = getc_unlocked (hostf);
647 for (;*p && !isspace(*p); ++p) {
651 /* Next we want to find the permitted name for the remote user. */
652 if (*p == ' ' || *p == '\t') {
653 /* <nul> terminate hostname and skip spaces */
654 for (*p++='\0'; *p && isspace (*p); ++p);
656 user = p; /* this is the user's name */
657 while (*p && !isspace (*p))
658 ++p; /* find end of user's name */
662 *p = '\0'; /* <nul> terminate username (+host?) */
664 /* buf -> host(?) ; user -> username(?) */
666 /* First check host part */
667 hcheck = __icheckhost (raddr, buf, rhost);
673 /* Then check user part */
677 ucheck = __icheckuser (user, ruser);
679 /* Positive 'host user' match? */
685 /* Negative 'host -user' match? */
689 /* Neither, go on looking for match */