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>
69 #include <netinet/in.h>
70 #include <arpa/inet.h>
79 #include <stdio_ext.h>
84 #ifdef __UCLIBC_HAS_WCHAR__
88 #include <bits/uClibc_alloc.h>
91 /* some forward declarations */
92 static int __ivaliduser2(FILE *hostf, u_int32_t raddr,
93 const char *luser, const char *ruser, const char *rhost);
94 static int iruserok2 (u_int32_t raddr, int superuser, const char *ruser,
95 const char *luser, const char *rhost);
98 int rcmd(char **ahost, u_short rport, const char *locuser, const char *remuser,
99 const char *cmd, int *fd2p)
101 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
103 struct hostent hostbuf;
108 struct sockaddr_in sin, from;
109 struct pollfd pfd[2];
117 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
119 tmphstbuf = stack_heap_alloc(hstbuflen);
121 while (gethostbyname_r (*ahost, &hostbuf, tmphstbuf,
122 hstbuflen, &hp, &herr) != 0 || hp == NULL)
124 if (herr != NETDB_INTERNAL || errno != ERANGE)
126 __set_h_errno (herr);
127 stack_heap_free(tmphstbuf);
133 /* Enlarge the buffer. */
135 stack_heap_free(tmphstbuf);
136 tmphstbuf = stack_heap_alloc(hstbuflen);
139 stack_heap_free(tmphstbuf);
140 #else /* call the non-reentrant version */
141 if ((hp = gethostbyname(*ahost)) == NULL) {
145 pfd[0].events = POLLIN;
146 pfd[1].events = POLLIN;
149 oldmask = sigblock(sigmask(SIGURG)); /* __sigblock */
150 for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
151 s = rresvport(&lport);
154 (void)fprintf(stderr,
155 "rcmd: socket: All ports in use\n");
157 (void)fprintf(stderr, "rcmd: socket: %m\n");
158 sigsetmask(oldmask); /* sigsetmask */
161 fcntl(s, F_SETOWN, pid);
162 sin.sin_family = hp->h_addrtype;
163 memmove(&sin.sin_addr, hp->h_addr_list[0],
164 MIN (sizeof (sin.sin_addr), hp->h_length));
165 sin.sin_port = rport;
166 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) /* __connect */
169 if (errno == EADDRINUSE) {
173 if (errno == ECONNREFUSED && timo <= 16) {
174 (void)sleep(timo); /* __sleep */
178 if (hp->h_addr_list[1] != NULL) {
181 (void)fprintf(stderr, "connect to address %s: ",
182 inet_ntoa(sin.sin_addr));
183 __set_errno (oerrno);
186 memmove(&sin.sin_addr, hp->h_addr_list[0],
187 MIN (sizeof (sin.sin_addr), hp->h_length));
188 (void)fprintf(stderr, "Trying %s...\n",
189 inet_ntoa(sin.sin_addr));
192 (void)fprintf(stderr, "%s: %m\n", hp->h_name);
193 sigsetmask(oldmask); /* __sigsetmask */
202 int s2 = rresvport(&lport), s3;
203 socklen_t len = sizeof(from);
208 (void)snprintf(num, sizeof(num), "%d", lport); /* __snprintf */
209 if (write(s, num, strlen(num)+1) != strlen(num)+1) {
210 (void)fprintf(stderr,
211 "rcmd: write (setting up stderr): %m\n");
218 if (poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){
220 (void)fprintf(stderr, "rcmd: poll (setting up stderr): %m\n");
222 (void)fprintf(stderr, "poll: protocol failure in circuit setup\n");
226 s3 = accept(s2, (struct sockaddr *)&from, &len);
229 (void)fprintf(stderr,
230 "rcmd: accept: %m\n");
235 from.sin_port = ntohs((u_short)from.sin_port);
236 if (from.sin_family != AF_INET ||
237 from.sin_port >= IPPORT_RESERVED ||
238 from.sin_port < IPPORT_RESERVED / 2) {
239 (void)fprintf(stderr,
240 "socket: protocol failure in circuit setup\n");
244 (void)write(s, locuser, strlen(locuser)+1);
245 (void)write(s, remuser, strlen(remuser)+1);
246 (void)write(s, cmd, strlen(cmd)+1);
247 if (read(s, &c, 1) != 1) {
248 (void)fprintf(stderr,
249 "rcmd: %s: %m\n", *ahost);
253 while (read(s, &c, 1) == 1) {
254 (void)write(STDERR_FILENO, &c, 1);
271 int rresvport(int *alport)
273 struct sockaddr_in sin;
276 sin.sin_family = AF_INET;
277 sin.sin_addr.s_addr = INADDR_ANY;
278 s = socket(AF_INET, SOCK_STREAM, 0);
282 sin.sin_port = htons((u_short)*alport);
283 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
285 if (errno != EADDRINUSE) {
290 if (*alport == IPPORT_RESERVED/2) {
292 __set_errno (EAGAIN); /* close */
299 libc_hidden_def(rresvport)
301 /* This needs to be exported ... while it is not a documented interface
302 * for rcp related apps, it's a required one that is used to control the
303 * rhost behavior. Legacy sucks.
305 int __check_rhosts_file = 1;
307 int ruserok(const char *rhost, int superuser, const char *ruser,
313 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
317 struct hostent hostbuf;
320 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
322 buffer = stack_heap_alloc(buflen);
324 while (gethostbyname_r (rhost, &hostbuf, buffer,
325 buflen, &hp, &herr) != 0 || hp == NULL)
327 if (herr != NETDB_INTERNAL || errno != ERANGE) {
328 stack_heap_free(buffer);
332 /* Enlarge the buffer. */
334 stack_heap_free(buffer);
335 buffer = stack_heap_alloc(buflen);
338 stack_heap_free(buffer);
340 if ((hp = gethostbyname(rhost)) == NULL) {
344 for (ap = hp->h_addr_list; *ap; ++ap) {
345 memmove(&addr, *ap, sizeof(addr));
346 if (iruserok2(addr, superuser, ruser, luser, rhost) == 0)
353 /* Extremely paranoid file open function. */
355 iruserfopen (const char *file, uid_t okuser)
361 /* If not a regular file, if owned by someone other than user or
362 root, if writeable by anyone but the owner, or if hardlinked
364 if (lstat (file, &st))
366 else if (!S_ISREG (st.st_mode))
367 cp = "not regular file";
370 res = fopen (file, "r");
373 else if (fstat (fileno (res), &st) < 0)
375 else if (st.st_uid && st.st_uid != okuser)
377 else if (st.st_mode & (S_IWGRP|S_IWOTH))
378 cp = "writeable by other than owner";
379 else if (st.st_nlink > 1)
380 cp = "hard linked somewhere";
383 /* If there were any problems, quit. */
396 * New .rhosts strategy: We are passed an ip address. We spin through
397 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
398 * has ip addresses, we don't have to trust a nameserver. When it
399 * contains hostnames, we spin through the list of addresses the nameserver
400 * gives us and look for a match.
402 * Returns 0 if ok, -1 if not ok.
405 iruserok2 (u_int32_t raddr, int superuser, const char *ruser, const char *luser,
412 hostf = iruserfopen (_PATH_HEQUIV, 0);
415 isbad = __ivaliduser2 (hostf, raddr, luser, ruser, rhost);
422 if (__check_rhosts_file || superuser) {
428 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
429 size_t buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
430 struct passwd pwdbuf;
431 char *buffer = stack_heap_alloc(buflen);
433 if (getpwnam_r (luser, &pwdbuf, buffer,
434 buflen, &pwd) != 0 || pwd == NULL)
436 stack_heap_free(buffer);
439 stack_heap_free(buffer);
441 if ((pwd = getpwnam(luser)) == NULL)
445 dirlen = strlen (pwd->pw_dir);
446 pbuf = malloc (dirlen + sizeof "/.rhosts");
447 strcpy (pbuf, pwd->pw_dir);
448 strcat (pbuf, "/.rhosts");
450 /* Change effective uid while reading .rhosts. If root and
451 reading an NFS mounted file system, can't read files that
452 are protected read/write owner only. */
454 seteuid (pwd->pw_uid);
455 hostf = iruserfopen (pbuf, pwd->pw_uid);
459 isbad = __ivaliduser2 (hostf, raddr, luser, ruser, rhost);
469 /* This is the exported version. */
470 int iruserok (u_int32_t raddr, int superuser, const char * ruser, const char * luser);
471 int iruserok (u_int32_t raddr, int superuser, const char * ruser, const char * luser)
473 return iruserok2 (raddr, superuser, ruser, luser, "-");
479 * Don't make static, used by lpd(8).
481 * This function is not used anymore. It is only present because lpd(8)
482 * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
483 * argument. This means that netgroups won't work in .rhost/hosts.equiv
484 * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
486 * Returns 0 if ok, -1 if not ok.
489 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser);
491 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser)
493 return __ivaliduser2(hostf, raddr, luser, ruser, "-");
497 /* Returns 1 on positive match, 0 on no match, -1 on negative match. */
499 __icheckhost (u_int32_t raddr, char *lhost, const char *rhost)
503 int negate=1; /* Multiply return with this to get -1 instead of 1 */
506 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
510 struct hostent hostbuf;
515 /* Check nis netgroup. */
516 if (strncmp ("+@", lhost, 2) == 0)
517 return innetgr (&lhost[2], rhost, NULL, NULL);
519 if (strncmp ("-@", lhost, 2) == 0)
520 return -innetgr (&lhost[2], rhost, NULL, NULL);
521 #endif /* HAVE_NETGROUP */
524 if (strncmp ("-", lhost,1) == 0) {
527 } else if (strcmp ("+",lhost) == 0) {
528 return 1; /* asking for trouble, but ok.. */
531 /* Try for raw ip address first. */
532 if (isdigit (*lhost) && (laddr = inet_addr (lhost)) != INADDR_NONE)
533 return negate * (! (raddr ^ laddr));
535 /* Better be a hostname. */
536 #ifdef __UCLIBC_HAS_REENTRANT_RPC__
538 buffer = malloc(buflen);
541 while (gethostbyname_r (lhost, &hostbuf, buffer, buflen, &hp, &herr)
547 __set_errno (save_errno);
549 hp = gethostbyname(lhost);
550 #endif /* __UCLIBC_HAS_REENTRANT_RPC__ */
555 /* Spin through ip addresses. */
556 for (pp = hp->h_addr_list; *pp; ++pp)
557 if (!memcmp (&raddr, *pp, sizeof (u_int32_t)))
564 /* Returns 1 on positive match, 0 on no match, -1 on negative match. */
566 __icheckuser (const char *luser, const char *ruser)
570 luser is user entry from .rhosts/hosts.equiv file
571 ruser is user id on remote host
576 if (strncmp ("+@", luser, 2) == 0)
577 return innetgr (&luser[2], NULL, ruser, NULL);
579 if (strncmp ("-@", luser,2) == 0)
580 return -innetgr (&luser[2], NULL, ruser, NULL);
581 #endif /* HAVE_NETGROUP */
584 if (strncmp ("-", luser, 1) == 0)
585 return -(strcmp (&luser[1], ruser) == 0);
588 if (strcmp ("+", luser) == 0)
591 /* simple string match */
592 return strcmp (ruser, luser) == 0;
596 * Returns 1 for blank lines (or only comment lines) and 0 otherwise
601 while (*p && isspace (*p)) {
605 return (*p == '\0' || *p == '#') ? 1 : 0 ;
609 * Returns 0 if positive match, -1 if _not_ ok.
612 __ivaliduser2(FILE *hostf, u_int32_t raddr, const char *luser,
613 const char *ruser, const char *rhost)
615 register const char *user;
622 while (getline (&buf, &bufsize, hostf) > 0) {
623 buf[bufsize - 1] = '\0'; /* Make sure it's terminated. */
626 /* Skip empty or comment lines */
631 /* Skip lines that are too long. */
632 if (strchr (p, '\n') == NULL) {
633 int ch = getc_unlocked (hostf);
635 while (ch != '\n' && ch != EOF)
636 ch = getc_unlocked (hostf);
640 for (;*p && !isspace(*p); ++p) {
644 /* Next we want to find the permitted name for the remote user. */
645 if (*p == ' ' || *p == '\t') {
646 /* <nul> terminate hostname and skip spaces */
647 for (*p++='\0'; *p && isspace (*p); ++p);
649 user = p; /* this is the user's name */
650 while (*p && !isspace (*p))
651 ++p; /* find end of user's name */
655 *p = '\0'; /* <nul> terminate username (+host?) */
657 /* buf -> host(?) ; user -> username(?) */
659 /* First check host part */
660 hcheck = __icheckhost (raddr, buf, rhost);
666 /* Then check user part */
670 ucheck = __icheckuser (user, ruser);
672 /* Positive 'host user' match? */
678 /* Negative 'host -user' match? */
682 /* Neither, go on looking for match */