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 */