1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include "namespace.h"
33 #include <sys/param.h>
34 #include <sys/socket.h>
35 #include <sys/stat.h>
36
37 #include <netinet/in.h>
38 #include <arpa/inet.h>
39
40 #include <signal.h>
41 #include <fcntl.h>
42 #include <netdb.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45 #include <pwd.h>
46 #include <errno.h>
47 #include <stdio.h>
48 #include <ctype.h>
49 #include <string.h>
50 #include <rpc/rpc.h>
51 #ifdef YP
52 #include <rpcsvc/yp_prot.h>
53 #include <rpcsvc/ypclnt.h>
54 #endif
55 #include <arpa/nameser.h>
56 #include "un-namespace.h"
57 #include "libc_private.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 ((p = secure_getenv("RSH")) != NULL) {
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 (void)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 __libc_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 (void)fprintf(stderr,
151 "rcmd: socket: All ports in use\n");
152 else
153 (void)fprintf(stderr, "rcmd: socket: %s\n",
154 strerror(errno));
155 freeaddrinfo(res);
156 __libc_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 (void)_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 (void)fprintf(stderr, "%s: %s\n",
172 *ahost, strerror(errno));
173 freeaddrinfo(res);
174 __libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
175 NULL);
176 return (-1);
177 }
178 if (nres > 1) {
179 int oerrno = errno;
180
181 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
182 sizeof(paddr), NULL, 0, NI_NUMERICHOST);
183 (void)fprintf(stderr, "connect to address %s: ",
184 paddr);
185 errno = oerrno;
186 perror(0);
187 }
188 if ((ai = ai->ai_next) == NULL) {
189 /* refused && timo <= 16 */
190 struct timespec time_to_sleep, time_remaining;
191
192 time_to_sleep.tv_sec = timo;
193 time_to_sleep.tv_nsec = 0;
194 (void)_nanosleep(&time_to_sleep, &time_remaining);
195 timo *= 2;
196 ai = res;
197 refused = 0;
198 }
199 if (nres > 1) {
200 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
201 sizeof(paddr), NULL, 0, NI_NUMERICHOST);
202 fprintf(stderr, "Trying %s...\n", paddr);
203 }
204 }
205 lport--;
206 if (fd2p == NULL) {
207 _write(s, "", 1);
208 lport = 0;
209 } else {
210 int s2 = rresvport_af(&lport, ai->ai_family), s3;
211 socklen_t len = ai->ai_addrlen;
212 int nfds;
213
214 if (s2 < 0)
215 goto bad;
216 _listen(s2, 1);
217 (void)snprintf(num, sizeof(num), "%d", lport);
218 if (_write(s, num, strlen(num)+1) != strlen(num)+1) {
219 (void)fprintf(stderr,
220 "rcmd: write (setting up stderr): %s\n",
221 strerror(errno));
222 (void)_close(s2);
223 goto bad;
224 }
225 nfds = max(s, s2)+1;
226 if(nfds > FD_SETSIZE) {
227 fprintf(stderr, "rcmd: too many files\n");
228 (void)_close(s2);
229 goto bad;
230 }
231 again:
232 FD_ZERO(&reads);
233 FD_SET(s, &reads);
234 FD_SET(s2, &reads);
235 errno = 0;
236 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
237 if (errno != 0)
238 (void)fprintf(stderr,
239 "rcmd: select (setting up stderr): %s\n",
240 strerror(errno));
241 else
242 (void)fprintf(stderr,
243 "select: protocol failure in circuit setup\n");
244 (void)_close(s2);
245 goto bad;
246 }
247 s3 = _accept(s2, (struct sockaddr *)&from, &len);
248 switch (from.ss_family) {
249 case AF_INET:
250 aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
251 break;
252 #ifdef INET6
253 case AF_INET6:
254 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
255 break;
256 #endif
257 default:
258 aport = 0; /* error */
259 break;
260 }
261 /*
262 * XXX careful for ftp bounce attacks. If discovered, shut them
263 * down and check for the real auxiliary channel to connect.
264 */
265 if (aport == 20) {
266 _close(s3);
267 goto again;
268 }
269 (void)_close(s2);
270 if (s3 < 0) {
271 (void)fprintf(stderr,
272 "rcmd: accept: %s\n", strerror(errno));
273 lport = 0;
274 goto bad;
275 }
276 *fd2p = s3;
277 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
278 (void)fprintf(stderr,
279 "socket: protocol failure in circuit setup.\n");
280 goto bad2;
281 }
282 }
283 (void)_write(s, locuser, strlen(locuser)+1);
284 (void)_write(s, remuser, strlen(remuser)+1);
285 (void)_write(s, cmd, strlen(cmd)+1);
286 if (_read(s, &c, 1) != 1) {
287 (void)fprintf(stderr,
288 "rcmd: %s: %s\n", *ahost, strerror(errno));
289 goto bad2;
290 }
291 if (c != 0) {
292 while (_read(s, &c, 1) == 1) {
293 (void)_write(STDERR_FILENO, &c, 1);
294 if (c == '\n')
295 break;
296 }
297 goto bad2;
298 }
299 __libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
300 freeaddrinfo(res);
301 return (s);
302 bad2:
303 if (lport)
304 (void)_close(*fd2p);
305 bad:
306 (void)_close(s);
307 __libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
308 freeaddrinfo(res);
309 return (-1);
310 }
311
312 int
rresvport(int * port)313 rresvport(int *port)
314 {
315 return rresvport_af(port, AF_INET);
316 }
317
318 int
rresvport_af(int * alport,int family)319 rresvport_af(int *alport, int family)
320 {
321 int s;
322 struct sockaddr_storage ss;
323 u_short *sport;
324
325 memset(&ss, 0, sizeof(ss));
326 ss.ss_family = family;
327 switch (family) {
328 case AF_INET:
329 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
330 sport = &((struct sockaddr_in *)&ss)->sin_port;
331 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
332 break;
333 #ifdef INET6
334 case AF_INET6:
335 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
336 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
337 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
338 break;
339 #endif
340 default:
341 errno = EAFNOSUPPORT;
342 return -1;
343 }
344
345 s = _socket(ss.ss_family, SOCK_STREAM, 0);
346 if (s < 0)
347 return (-1);
348 #if 0 /* compat_exact_traditional_rresvport_semantics */
349 sin.sin_port = htons((u_short)*alport);
350 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
351 return (s);
352 if (errno != EADDRINUSE) {
353 (void)_close(s);
354 return (-1);
355 }
356 #endif
357 *sport = 0;
358 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
359 (void)_close(s);
360 return (-1);
361 }
362 *alport = (int)ntohs(*sport);
363 return (s);
364 }
365
366 int __check_rhosts_file = 1;
367 char *__rcmd_errstr;
368
369 int
ruserok(const char * rhost,int superuser,const char * ruser,const char * luser)370 ruserok(const char *rhost, int superuser, const char *ruser, const char *luser)
371 {
372 struct addrinfo hints, *res, *r;
373 int error;
374
375 memset(&hints, 0, sizeof(hints));
376 hints.ai_family = PF_UNSPEC;
377 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
378 error = getaddrinfo(rhost, "0", &hints, &res);
379 if (error)
380 return (-1);
381
382 for (r = res; r; r = r->ai_next) {
383 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
384 luser) == 0) {
385 freeaddrinfo(res);
386 return (0);
387 }
388 }
389 freeaddrinfo(res);
390 return (-1);
391 }
392
393 /*
394 * New .rhosts strategy: We are passed an ip address. We spin through
395 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
396 * has ip addresses, we don't have to trust a nameserver. When it
397 * contains hostnames, we spin through the list of addresses the nameserver
398 * gives us and look for a match.
399 *
400 * Returns 0 if ok, -1 if not ok.
401 */
402 int
iruserok(unsigned long raddr,int superuser,const char * ruser,const char * luser)403 iruserok(unsigned long raddr, int superuser, const char *ruser, const char *luser)
404 {
405 struct sockaddr_in sin;
406
407 memset(&sin, 0, sizeof(sin));
408 sin.sin_family = AF_INET;
409 sin.sin_len = sizeof(struct sockaddr_in);
410 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
411 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser,
412 ruser, luser);
413 }
414
415 /*
416 * AF independent extension of iruserok.
417 *
418 * Returns 0 if ok, -1 if not ok.
419 */
420 int
iruserok_sa(const void * ra,int rlen,int superuser,const char * ruser,const char * luser)421 iruserok_sa(const void *ra, int rlen, int superuser, const char *ruser,
422 const char *luser)
423 {
424 char *cp;
425 struct stat sbuf;
426 struct passwd *pwd;
427 FILE *hostf;
428 uid_t uid;
429 int first;
430 char pbuf[MAXPATHLEN];
431 const struct sockaddr *raddr;
432 struct sockaddr_storage ss;
433
434 /* avoid alignment issue */
435 if (rlen <= 0 || rlen > sizeof(ss))
436 return (-1);
437 memcpy(&ss, ra, rlen);
438 raddr = (struct sockaddr *)&ss;
439
440 first = 1;
441 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "re");
442 again:
443 if (hostf) {
444 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) {
445 (void)fclose(hostf);
446 return (0);
447 }
448 (void)fclose(hostf);
449 }
450 if (first == 1 && (__check_rhosts_file || superuser)) {
451 first = 0;
452 if ((pwd = getpwnam(luser)) == NULL)
453 return (-1);
454 (void)strlcpy(pbuf, pwd->pw_dir, sizeof(pbuf));
455 (void)strlcat(pbuf, "/.rhosts", sizeof(pbuf));
456
457 /*
458 * Change effective uid while opening .rhosts. If root and
459 * reading an NFS mounted file system, can't read files that
460 * are protected read/write owner only.
461 */
462 uid = geteuid();
463 (void)seteuid(pwd->pw_uid);
464 hostf = fopen(pbuf, "re");
465 (void)seteuid(uid);
466
467 if (hostf == NULL)
468 return (-1);
469 /*
470 * If not a regular file, or is owned by someone other than
471 * user or root or if writeable by anyone but the owner, quit.
472 */
473 cp = NULL;
474 if (lstat(pbuf, &sbuf) < 0)
475 cp = ".rhosts lstat failed";
476 else if (!S_ISREG(sbuf.st_mode))
477 cp = ".rhosts not regular file";
478 else if (_fstat(fileno(hostf), &sbuf) < 0)
479 cp = ".rhosts fstat failed";
480 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
481 cp = "bad .rhosts owner";
482 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
483 cp = ".rhosts writeable by other than owner";
484 /* If there were any problems, quit. */
485 if (cp) {
486 __rcmd_errstr = cp;
487 (void)fclose(hostf);
488 return (-1);
489 }
490 goto again;
491 }
492 return (-1);
493 }
494
495 /*
496 * XXX
497 * Don't make static, used by lpd(8).
498 *
499 * Returns 0 if ok, -1 if not ok.
500 */
501 int
__ivaliduser(FILE * hostf,u_int32_t raddr,const char * luser,const char * ruser)502 __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser)
503 {
504 struct sockaddr_in sin;
505
506 memset(&sin, 0, sizeof(sin));
507 sin.sin_family = AF_INET;
508 sin.sin_len = sizeof(struct sockaddr_in);
509 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
510 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
511 luser, ruser);
512 }
513
514 /*
515 * Returns 0 if ok, -1 if not ok.
516 *
517 * XXX obsolete API.
518 */
519 int
__ivaliduser_af(FILE * hostf,const void * raddr,const char * luser,const char * ruser,int af,int len)520 __ivaliduser_af(FILE *hostf, const void *raddr, const char *luser,
521 const char *ruser, int af, int len)
522 {
523 struct sockaddr *sa = NULL;
524 struct sockaddr_in *sin = NULL;
525 #ifdef INET6
526 struct sockaddr_in6 *sin6 = NULL;
527 #endif
528 struct sockaddr_storage ss;
529
530 memset(&ss, 0, sizeof(ss));
531 switch (af) {
532 case AF_INET:
533 if (len != sizeof(sin->sin_addr))
534 return -1;
535 sin = (struct sockaddr_in *)&ss;
536 sin->sin_family = AF_INET;
537 sin->sin_len = sizeof(struct sockaddr_in);
538 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
539 break;
540 #ifdef INET6
541 case AF_INET6:
542 if (len != sizeof(sin6->sin6_addr))
543 return -1;
544 /* you will lose scope info */
545 sin6 = (struct sockaddr_in6 *)&ss;
546 sin6->sin6_family = AF_INET6;
547 sin6->sin6_len = sizeof(struct sockaddr_in6);
548 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
549 break;
550 #endif
551 default:
552 return -1;
553 }
554
555 sa = (struct sockaddr *)&ss;
556 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser);
557 }
558
559 int
__ivaliduser_sa(FILE * hostf,const struct sockaddr * raddr,socklen_t salen,const char * luser,const char * ruser)560 __ivaliduser_sa(FILE *hostf, const struct sockaddr *raddr, socklen_t salen,
561 const char *luser, const char *ruser)
562 {
563 char *user, *p;
564 int ch;
565 char buf[MAXHOSTNAMELEN + 128]; /* host + login */
566 char hname[MAXHOSTNAMELEN];
567 /* Presumed guilty until proven innocent. */
568 int userok = 0, hostok = 0;
569 #ifdef YP
570 char *ypdomain;
571
572 if (yp_get_default_domain(&ypdomain))
573 ypdomain = NULL;
574 #else
575 #define ypdomain NULL
576 #endif
577 /* We need to get the damn hostname back for netgroup matching. */
578 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0,
579 NI_NAMEREQD) != 0)
580 hname[0] = '\0';
581
582 while (fgets(buf, sizeof(buf), hostf)) {
583 p = buf;
584 /* Skip lines that are too long. */
585 if (strchr(p, '\n') == NULL) {
586 while ((ch = getc(hostf)) != '\n' && ch != EOF);
587 continue;
588 }
589 if (*p == '\n' || *p == '#') {
590 /* comment... */
591 continue;
592 }
593 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
594 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
595 p++;
596 }
597 if (*p == ' ' || *p == '\t') {
598 *p++ = '\0';
599 while (*p == ' ' || *p == '\t')
600 p++;
601 user = p;
602 while (*p != '\n' && *p != ' ' &&
603 *p != '\t' && *p != '\0')
604 p++;
605 } else
606 user = p;
607 *p = '\0';
608 /*
609 * Do +/- and +@/-@ checking. This looks really nasty,
610 * but it matches SunOS's behavior so far as I can tell.
611 */
612 switch(buf[0]) {
613 case '+':
614 if (!buf[1]) { /* '+' matches all hosts */
615 hostok = 1;
616 break;
617 }
618 if (buf[1] == '@') /* match a host by netgroup */
619 hostok = hname[0] != '\0' &&
620 innetgr(&buf[2], hname, NULL, ypdomain);
621 else /* match a host by addr */
622 hostok = __icheckhost(raddr, salen,
623 (char *)&buf[1]);
624 break;
625 case '-': /* reject '-' hosts and all their users */
626 if (buf[1] == '@') {
627 if (hname[0] == '\0' ||
628 innetgr(&buf[2], hname, NULL, ypdomain))
629 return(-1);
630 } else {
631 if (__icheckhost(raddr, salen,
632 (char *)&buf[1]))
633 return(-1);
634 }
635 break;
636 default: /* if no '+' or '-', do a simple match */
637 hostok = __icheckhost(raddr, salen, buf);
638 break;
639 }
640 switch(*user) {
641 case '+':
642 if (!*(user+1)) { /* '+' matches all users */
643 userok = 1;
644 break;
645 }
646 if (*(user+1) == '@') /* match a user by netgroup */
647 userok = innetgr(user+2, NULL, ruser, ypdomain);
648 else /* match a user by direct specification */
649 userok = !(strcmp(ruser, user+1));
650 break;
651 case '-': /* if we matched a hostname, */
652 if (hostok) { /* check for user field rejections */
653 if (!*(user+1))
654 return(-1);
655 if (*(user+1) == '@') {
656 if (innetgr(user+2, NULL,
657 ruser, ypdomain))
658 return(-1);
659 } else {
660 if (!strcmp(ruser, user+1))
661 return(-1);
662 }
663 }
664 break;
665 default: /* no rejections: try to match the user */
666 if (hostok)
667 userok = !(strcmp(ruser,*user ? user : luser));
668 break;
669 }
670 if (hostok && userok)
671 return(0);
672 }
673 return (-1);
674 }
675
676 /*
677 * Returns "true" if match, 0 if no match.
678 */
679 static int
__icheckhost(const struct sockaddr * raddr,socklen_t salen,const char * lhost)680 __icheckhost(const struct sockaddr *raddr, socklen_t salen, const char *lhost)
681 {
682 struct sockaddr_in sin;
683 struct sockaddr_in6 *sin6;
684 struct addrinfo hints, *res, *r;
685 int error;
686 char h1[NI_MAXHOST], h2[NI_MAXHOST];
687
688 if (raddr->sa_family == AF_INET6) {
689 sin6 = (struct sockaddr_in6 *)raddr;
690 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
691 memset(&sin, 0, sizeof(sin));
692 sin.sin_family = AF_INET;
693 sin.sin_len = sizeof(struct sockaddr_in);
694 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
695 sizeof(sin.sin_addr));
696 raddr = (struct sockaddr *)&sin;
697 salen = sin.sin_len;
698 }
699 }
700
701 h1[0] = '\0';
702 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
703 NI_NUMERICHOST) != 0)
704 return (0);
705
706 /* Resolve laddr into sockaddr */
707 memset(&hints, 0, sizeof(hints));
708 hints.ai_family = raddr->sa_family;
709 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/
710 res = NULL;
711 error = getaddrinfo(lhost, "0", &hints, &res);
712 if (error)
713 return (0);
714
715 for (r = res; r ; r = r->ai_next) {
716 h2[0] = '\0';
717 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
718 NULL, 0, NI_NUMERICHOST) != 0)
719 continue;
720 if (strcmp(h1, h2) == 0) {
721 freeaddrinfo(res);
722 return (1);
723 }
724 }
725
726 /* No match. */
727 freeaddrinfo(res);
728 return (0);
729 }
730