1 /*
2 * Copyright (c) 1983, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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 University 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.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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
27 * SUCH DAMAGE.
28 *
29 * @(#)rcmd.c 8.3 (Berkeley) 3/26/94
30 * $FreeBSD: src/lib/libc/net/rcmd.c,v 1.42 2007/01/09 00:28:02 imp Exp $
31 */
32
33 #include "namespace.h"
34 #include <sys/param.h>
35 #include <sys/socket.h>
36 #include <sys/stat.h>
37
38 #include <netinet/in.h>
39 #include <arpa/inet.h>
40
41 #include <signal.h>
42 #include <fcntl.h>
43 #include <netdb.h>
44 #include <stdlib.h>
45 #include <unistd.h>
46 #include <pwd.h>
47 #include <errno.h>
48 #include <stdio.h>
49 #include <ctype.h>
50 #include <string.h>
51 #include <rpc/rpc.h>
52 #ifdef YP
53 #include <rpcsvc/yp_prot.h>
54 #include <rpcsvc/ypclnt.h>
55 #endif
56 #include <arpa/nameser.h>
57 #include "un-namespace.h"
58
59 extern int innetgr(const char *, const char *, const char *, const char *);
60
61 #define max(a, b) ((a > b) ? a : b)
62
63 int __ivaliduser(FILE *, u_int32_t, const char *, const char *);
64 int __ivaliduser_af(FILE *,const void *, const char *, const char *, int, int);
65 int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t, const char *,
66 const char *);
67 static int __icheckhost(const struct sockaddr *, socklen_t, const char *);
68
69 char paddr[NI_MAXHOST];
70
71 int
rcmd(char ** ahost,int rport,const char * locuser,const char * remuser,const char * cmd,int * fd2p)72 rcmd(char **ahost, int rport, const char *locuser, const char *remuser,
73 const char *cmd, int *fd2p)
74 {
75 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
76 }
77
78 int
rcmd_af(char ** ahost,int rport,const char * locuser,const char * remuser,const char * cmd,int * fd2p,int af)79 rcmd_af(char **ahost, int rport, const char *locuser, const char *remuser,
80 const char *cmd, int *fd2p, int af)
81 {
82 struct addrinfo hints, *res, *ai;
83 struct sockaddr_storage from;
84 fd_set reads;
85 sigset_t oldmask, newmask;
86 pid_t pid;
87 int s, aport, lport, timo, error;
88 char c, *p;
89 int refused, nres;
90 char num[8];
91 static char canonnamebuf[MAXDNAME]; /* is it proper here? */
92
93 /* call rcmdsh() with specified remote shell if appropriate. */
94 if (!issetugid() && (p = getenv("RSH"))) {
95 struct servent *sp = getservbyname("shell", "tcp");
96
97 if (sp && sp->s_port == rport)
98 return (rcmdsh(ahost, rport, locuser, remuser,
99 cmd, p));
100 }
101
102 /* use rsh(1) if non-root and remote port is shell. */
103 if (geteuid()) {
104 struct servent *sp = getservbyname("shell", "tcp");
105
106 if (sp && sp->s_port == rport)
107 return (rcmdsh(ahost, rport, locuser, remuser,
108 cmd, NULL));
109 }
110
111 pid = getpid();
112
113 memset(&hints, 0, sizeof(hints));
114 hints.ai_flags = AI_CANONNAME;
115 hints.ai_family = af;
116 hints.ai_socktype = SOCK_STREAM;
117 hints.ai_protocol = 0;
118 snprintf(num, sizeof(num), "%d", ntohs(rport));
119 error = getaddrinfo(*ahost, num, &hints, &res);
120 if (error) {
121 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
122 gai_strerror(error));
123 if (error == EAI_SYSTEM)
124 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
125 strerror(errno));
126 return (-1);
127 }
128
129 if (res->ai_canonname &&
130 strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) {
131 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf));
132 *ahost = canonnamebuf;
133 }
134 nres = 0;
135 for (ai = res; ai; ai = ai->ai_next)
136 nres++;
137 ai = res;
138 refused = 0;
139 sigemptyset(&newmask);
140 sigaddset(&newmask, SIGURG);
141 _sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask);
142 for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
143 s = rresvport_af(&lport, ai->ai_family);
144 if (s < 0) {
145 if (errno != EAGAIN && ai->ai_next) {
146 ai = ai->ai_next;
147 continue;
148 }
149 if (errno == EAGAIN)
150 fprintf(stderr,
151 "rcmd: socket: All ports in use\n");
152 else
153 fprintf(stderr, "rcmd: socket: %s\n",
154 strerror(errno));
155 freeaddrinfo(res);
156 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
157 NULL);
158 return (-1);
159 }
160 _fcntl(s, F_SETOWN, pid);
161 if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
162 break;
163 _close(s);
164 if (errno == EADDRINUSE) {
165 lport--;
166 continue;
167 }
168 if (errno == ECONNREFUSED)
169 refused = 1;
170 if (ai->ai_next == NULL && (!refused || timo > 16)) {
171 fprintf(stderr, "%s: %s\n", *ahost, strerror(errno));
172 freeaddrinfo(res);
173 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
174 NULL);
175 return (-1);
176 }
177 if (nres > 1) {
178 int oerrno = errno;
179
180 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
181 sizeof(paddr), NULL, 0, NI_NUMERICHOST);
182 fprintf(stderr, "connect to address %s: ", paddr);
183 errno = oerrno;
184 perror(0);
185 }
186 if ((ai = ai->ai_next) == NULL) {
187 /* refused && timo <= 16 */
188 struct timespec time_to_sleep, time_remaining;
189
190 time_to_sleep.tv_sec = timo;
191 time_to_sleep.tv_nsec = 0;
192 _nanosleep(&time_to_sleep, &time_remaining);
193 timo *= 2;
194 ai = res;
195 refused = 0;
196 }
197 if (nres > 1) {
198 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
199 sizeof(paddr), NULL, 0, NI_NUMERICHOST);
200 fprintf(stderr, "Trying %s...\n", paddr);
201 }
202 }
203 lport--;
204 if (fd2p == NULL) {
205 _write(s, "", 1);
206 lport = 0;
207 } else {
208 int s2 = rresvport_af(&lport, ai->ai_family), s3;
209 socklen_t len = ai->ai_addrlen;
210 int nfds;
211
212 if (s2 < 0)
213 goto bad;
214 _listen(s2, 1);
215 snprintf(num, sizeof(num), "%d", lport);
216 if (_write(s, num, strlen(num)+1) != strlen(num)+1) {
217 fprintf(stderr,
218 "rcmd: write (setting up stderr): %s\n",
219 strerror(errno));
220 _close(s2);
221 goto bad;
222 }
223 nfds = max(s, s2)+1;
224 if(nfds > FD_SETSIZE) {
225 fprintf(stderr, "rcmd: too many files\n");
226 _close(s2);
227 goto bad;
228 }
229 again:
230 FD_ZERO(&reads);
231 FD_SET(s, &reads);
232 FD_SET(s2, &reads);
233 errno = 0;
234 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
235 if (errno != 0)
236 fprintf(stderr,
237 "rcmd: select (setting up stderr): %s\n",
238 strerror(errno));
239 else
240 fprintf(stderr,
241 "select: protocol failure in circuit setup\n");
242 _close(s2);
243 goto bad;
244 }
245 s3 = _accept(s2, (struct sockaddr *)&from, &len);
246 switch (from.ss_family) {
247 case AF_INET:
248 aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
249 break;
250 #ifdef INET6
251 case AF_INET6:
252 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
253 break;
254 #endif
255 default:
256 aport = 0; /* error */
257 break;
258 }
259 /*
260 * XXX careful for ftp bounce attacks. If discovered, shut them
261 * down and check for the real auxiliary channel to connect.
262 */
263 if (aport == 20) {
264 _close(s3);
265 goto again;
266 }
267 _close(s2);
268 if (s3 < 0) {
269 fprintf(stderr,
270 "rcmd: accept: %s\n", strerror(errno));
271 lport = 0;
272 goto bad;
273 }
274 *fd2p = s3;
275 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
276 fprintf(stderr,
277 "socket: protocol failure in circuit setup.\n");
278 goto bad2;
279 }
280 }
281 _write(s, locuser, strlen(locuser)+1);
282 _write(s, remuser, strlen(remuser)+1);
283 _write(s, cmd, strlen(cmd)+1);
284 if (_read(s, &c, 1) != 1) {
285 fprintf(stderr,
286 "rcmd: %s: %s\n", *ahost, strerror(errno));
287 goto bad2;
288 }
289 if (c != 0) {
290 while (_read(s, &c, 1) == 1) {
291 _write(STDERR_FILENO, &c, 1);
292 if (c == '\n')
293 break;
294 }
295 goto bad2;
296 }
297 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
298 freeaddrinfo(res);
299 return (s);
300 bad2:
301 if (lport)
302 _close(*fd2p);
303 bad:
304 _close(s);
305 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
306 freeaddrinfo(res);
307 return (-1);
308 }
309
310 int
rresvport(int * port)311 rresvport(int *port)
312 {
313 return rresvport_af(port, AF_INET);
314 }
315
316 int
rresvport_af(int * alport,int family)317 rresvport_af(int *alport, int family)
318 {
319 int s;
320 struct sockaddr_storage ss;
321 u_short *sport;
322
323 memset(&ss, 0, sizeof(ss));
324 ss.ss_family = family;
325 switch (family) {
326 case AF_INET:
327 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
328 sport = &((struct sockaddr_in *)&ss)->sin_port;
329 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
330 break;
331 #ifdef INET6
332 case AF_INET6:
333 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
334 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
335 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
336 break;
337 #endif
338 default:
339 errno = EAFNOSUPPORT;
340 return -1;
341 }
342
343 s = _socket(ss.ss_family, SOCK_STREAM, 0);
344 if (s < 0)
345 return (-1);
346 #if 0 /* compat_exact_traditional_rresvport_semantics */
347 sin.sin_port = htons((u_short)*alport);
348 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
349 return (s);
350 if (errno != EADDRINUSE) {
351 _close(s);
352 return (-1);
353 }
354 #endif
355 *sport = 0;
356 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
357 _close(s);
358 return (-1);
359 }
360 *alport = (int)ntohs(*sport);
361 return (s);
362 }
363
364 int __check_rhosts_file = 1;
365 char *__rcmd_errstr;
366
367 int
ruserok(const char * rhost,int superuser,const char * ruser,const char * luser)368 ruserok(const char *rhost, int superuser, const char *ruser, const char *luser)
369 {
370 struct addrinfo hints, *res, *r;
371 int error;
372
373 memset(&hints, 0, sizeof(hints));
374 hints.ai_family = PF_UNSPEC;
375 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
376 error = getaddrinfo(rhost, "0", &hints, &res);
377 if (error)
378 return (-1);
379
380 for (r = res; r; r = r->ai_next) {
381 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
382 luser) == 0) {
383 freeaddrinfo(res);
384 return (0);
385 }
386 }
387 freeaddrinfo(res);
388 return (-1);
389 }
390
391 /*
392 * New .rhosts strategy: We are passed an ip address. We spin through
393 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
394 * has ip addresses, we don't have to trust a nameserver. When it
395 * contains hostnames, we spin through the list of addresses the nameserver
396 * gives us and look for a match.
397 *
398 * Returns 0 if ok, -1 if not ok.
399 */
400 int
iruserok(unsigned long raddr,int superuser,const char * ruser,const char * luser)401 iruserok(unsigned long raddr, int superuser, const char *ruser,
402 const char *luser)
403 {
404 struct sockaddr_in sin;
405
406 memset(&sin, 0, sizeof(sin));
407 sin.sin_family = AF_INET;
408 sin.sin_len = sizeof(struct sockaddr_in);
409 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
410 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser,
411 ruser, luser);
412 }
413
414 /*
415 * AF independent extension of iruserok.
416 *
417 * Returns 0 if ok, -1 if not ok.
418 */
419 int
iruserok_sa(const void * ra,int rlen,int superuser,const char * ruser,const char * luser)420 iruserok_sa(const void *ra, int rlen, int superuser, const char *ruser,
421 const char *luser)
422 {
423 char *cp;
424 struct stat sbuf;
425 struct passwd *pwd;
426 FILE *hostf;
427 uid_t uid;
428 int first;
429 char pbuf[MAXPATHLEN];
430 const struct sockaddr *raddr;
431 struct sockaddr_storage ss;
432
433 /* avoid alignment issue */
434 if (rlen > sizeof(ss))
435 return(-1);
436 memcpy(&ss, ra, rlen);
437 raddr = (struct sockaddr *)&ss;
438
439 first = 1;
440 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
441 again:
442 if (hostf) {
443 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) {
444 fclose(hostf);
445 return (0);
446 }
447 fclose(hostf);
448 }
449 if (first == 1 && (__check_rhosts_file || superuser)) {
450 first = 0;
451 if ((pwd = getpwnam(luser)) == NULL)
452 return (-1);
453 strcpy(pbuf, pwd->pw_dir);
454 strcat(pbuf, "/.rhosts");
455
456 /*
457 * Change effective uid while opening .rhosts. If root and
458 * reading an NFS mounted file system, can't read files that
459 * are protected read/write owner only.
460 */
461 uid = geteuid();
462 seteuid(pwd->pw_uid);
463 hostf = fopen(pbuf, "r");
464 seteuid(uid);
465
466 if (hostf == NULL)
467 return (-1);
468 /*
469 * If not a regular file, or is owned by someone other than
470 * user or root or if writeable by anyone but the owner, quit.
471 */
472 cp = NULL;
473 if (lstat(pbuf, &sbuf) < 0)
474 cp = ".rhosts lstat failed";
475 else if (!S_ISREG(sbuf.st_mode))
476 cp = ".rhosts not regular file";
477 else if (_fstat(fileno(hostf), &sbuf) < 0)
478 cp = ".rhosts fstat failed";
479 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
480 cp = "bad .rhosts owner";
481 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
482 cp = ".rhosts writeable by other than owner";
483 /* If there were any problems, quit. */
484 if (cp) {
485 __rcmd_errstr = cp;
486 fclose(hostf);
487 return (-1);
488 }
489 goto again;
490 }
491 return (-1);
492 }
493
494 /*
495 * XXX
496 * Don't make static, used by lpd(8).
497 *
498 * Returns 0 if ok, -1 if not ok.
499 */
500 int
__ivaliduser(FILE * hostf,u_int32_t raddr,const char * luser,const char * ruser)501 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser)
502 {
503 struct sockaddr_in sin;
504
505 memset(&sin, 0, sizeof(sin));
506 sin.sin_family = AF_INET;
507 sin.sin_len = sizeof(struct sockaddr_in);
508 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
509 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
510 luser, ruser);
511 }
512
513 /*
514 * Returns 0 if ok, -1 if not ok.
515 *
516 * XXX obsolete API.
517 */
518 int
__ivaliduser_af(FILE * hostf,const void * raddr,const char * luser,const char * ruser,int af,int len)519 __ivaliduser_af(FILE *hostf, const void *raddr, const char *luser,
520 const char *ruser, int af, int len)
521 {
522 struct sockaddr *sa = NULL;
523 struct sockaddr_in *sin = NULL;
524 #ifdef INET6
525 struct sockaddr_in6 *sin6 = NULL;
526 #endif
527 struct sockaddr_storage ss;
528
529 memset(&ss, 0, sizeof(ss));
530 switch (af) {
531 case AF_INET:
532 if (len != sizeof(sin->sin_addr))
533 return -1;
534 sin = (struct sockaddr_in *)&ss;
535 sin->sin_family = AF_INET;
536 sin->sin_len = sizeof(struct sockaddr_in);
537 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
538 break;
539 #ifdef INET6
540 case AF_INET6:
541 if (len != sizeof(sin6->sin6_addr))
542 return -1;
543 /* you will lose scope info */
544 sin6 = (struct sockaddr_in6 *)&ss;
545 sin6->sin6_family = AF_INET6;
546 sin6->sin6_len = sizeof(struct sockaddr_in6);
547 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
548 break;
549 #endif
550 default:
551 return -1;
552 }
553
554 sa = (struct sockaddr *)&ss;
555 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser);
556 }
557
558 int
__ivaliduser_sa(FILE * hostf,const struct sockaddr * raddr,socklen_t salen,const char * luser,const char * ruser)559 __ivaliduser_sa(FILE *hostf, const struct sockaddr *raddr, socklen_t salen,
560 const char *luser, const char *ruser)
561 {
562 char *user, *p;
563 int ch;
564 char buf[MAXHOSTNAMELEN + 128]; /* host + login */
565 char hname[MAXHOSTNAMELEN];
566 /* Presumed guilty until proven innocent. */
567 int userok = 0, hostok = 0;
568 #ifdef YP
569 char *ypdomain;
570
571 if (yp_get_default_domain(&ypdomain))
572 ypdomain = NULL;
573 #else
574 #define ypdomain NULL
575 #endif
576 /* We need to get the damn hostname back for netgroup matching. */
577 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0,
578 NI_NAMEREQD) != 0)
579 hname[0] = '\0';
580
581 while (fgets(buf, sizeof(buf), hostf)) {
582 p = buf;
583 /* Skip lines that are too long. */
584 if (strchr(p, '\n') == NULL) {
585 while ((ch = getc(hostf)) != '\n' && ch != EOF);
586 continue;
587 }
588 if (*p == '\n' || *p == '#') {
589 /* comment... */
590 continue;
591 }
592 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
593 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
594 p++;
595 }
596 if (*p == ' ' || *p == '\t') {
597 *p++ = '\0';
598 while (*p == ' ' || *p == '\t')
599 p++;
600 user = p;
601 while (*p != '\n' && *p != ' ' &&
602 *p != '\t' && *p != '\0')
603 p++;
604 } else
605 user = p;
606 *p = '\0';
607 /*
608 * Do +/- and +@/-@ checking. This looks really nasty,
609 * but it matches SunOS's behavior so far as I can tell.
610 */
611 switch(buf[0]) {
612 case '+':
613 if (!buf[1]) { /* '+' matches all hosts */
614 hostok = 1;
615 break;
616 }
617 if (buf[1] == '@') /* match a host by netgroup */
618 hostok = hname[0] != '\0' &&
619 innetgr(&buf[2], hname, NULL, ypdomain);
620 else /* match a host by addr */
621 hostok = __icheckhost(raddr, salen,
622 (char *)&buf[1]);
623 break;
624 case '-': /* reject '-' hosts and all their users */
625 if (buf[1] == '@') {
626 if (hname[0] == '\0' ||
627 innetgr(&buf[2], hname, NULL, ypdomain))
628 return(-1);
629 } else {
630 if (__icheckhost(raddr, salen,
631 (char *)&buf[1]))
632 return(-1);
633 }
634 break;
635 default: /* if no '+' or '-', do a simple match */
636 hostok = __icheckhost(raddr, salen, buf);
637 break;
638 }
639 switch(*user) {
640 case '+':
641 if (!*(user+1)) { /* '+' matches all users */
642 userok = 1;
643 break;
644 }
645 if (*(user+1) == '@') /* match a user by netgroup */
646 userok = innetgr(user+2, NULL, ruser, ypdomain);
647 else /* match a user by direct specification */
648 userok = !(strcmp(ruser, user+1));
649 break;
650 case '-': /* if we matched a hostname, */
651 if (hostok) { /* check for user field rejections */
652 if (!*(user+1))
653 return(-1);
654 if (*(user+1) == '@') {
655 if (innetgr(user+2, NULL,
656 ruser, ypdomain))
657 return(-1);
658 } else {
659 if (!strcmp(ruser, user+1))
660 return(-1);
661 }
662 }
663 break;
664 default: /* no rejections: try to match the user */
665 if (hostok)
666 userok = !(strcmp(ruser,*user ? user : luser));
667 break;
668 }
669 if (hostok && userok)
670 return(0);
671 }
672 return (-1);
673 }
674
675 /*
676 * Returns "true" if match, 0 if no match.
677 */
678 static int
__icheckhost(const struct sockaddr * raddr,socklen_t salen,const char * lhost)679 __icheckhost(const struct sockaddr *raddr, socklen_t salen, const char *lhost)
680 {
681 struct sockaddr_in sin;
682 struct sockaddr_in6 *sin6;
683 struct addrinfo hints, *res, *r;
684 int error;
685 char h1[NI_MAXHOST], h2[NI_MAXHOST];
686
687 if (raddr->sa_family == AF_INET6) {
688 sin6 = (struct sockaddr_in6 *)raddr;
689 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
690 memset(&sin, 0, sizeof(sin));
691 sin.sin_family = AF_INET;
692 sin.sin_len = sizeof(struct sockaddr_in);
693 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
694 sizeof(sin.sin_addr));
695 raddr = (struct sockaddr *)&sin;
696 salen = sin.sin_len;
697 }
698 }
699
700 h1[0] = '\0';
701 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
702 NI_NUMERICHOST) != 0)
703 return (0);
704
705 /* Resolve laddr into sockaddr */
706 memset(&hints, 0, sizeof(hints));
707 hints.ai_family = raddr->sa_family;
708 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/
709 res = NULL;
710 error = getaddrinfo(lhost, "0", &hints, &res);
711 if (error)
712 return (0);
713
714 for (r = res; r ; r = r->ai_next) {
715 h2[0] = '\0';
716 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
717 NULL, 0, NI_NUMERICHOST) != 0)
718 continue;
719 if (strcmp(h1, h2) == 0) {
720 freeaddrinfo(res);
721 return (1);
722 }
723 }
724
725 /* No match. */
726 freeaddrinfo(res);
727 return (0);
728 }
729