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-rw-r--r--src/lib/libc/net/rcmd.c388
1 files changed, 0 insertions, 388 deletions
diff --git a/src/lib/libc/net/rcmd.c b/src/lib/libc/net/rcmd.c
index 30ca6710c4..d566e0ca4c 100644
--- a/src/lib/libc/net/rcmd.c
+++ b/src/lib/libc/net/rcmd.c
@@ -46,13 +46,6 @@
46#include <string.h> 46#include <string.h>
47#include <syslog.h> 47#include <syslog.h>
48#include <stdlib.h> 48#include <stdlib.h>
49#include <netgroup.h>
50
51int __ivaliduser(FILE *, in_addr_t, const char *, const char *);
52int __ivaliduser_sa(FILE *, struct sockaddr *, socklen_t,
53 const char *, const char *);
54static int __icheckhost(struct sockaddr *, socklen_t, const char *);
55static char *__gethostloop(struct sockaddr *, socklen_t);
56 49
57int 50int
58rcmd(char **ahost, int rport, const char *locuser, const char *remuser, 51rcmd(char **ahost, int rport, const char *locuser, const char *remuser,
@@ -308,384 +301,3 @@ bad:
308 return (-1); 301 return (-1);
309} 302}
310 303
311int __check_rhosts_file = 1;
312char *__rcmd_errstr;
313
314int
315ruserok(const char *rhost, int superuser, const char *ruser, const char *luser)
316{
317 struct addrinfo hints, *res, *r;
318 int error;
319
320 memset(&hints, 0, sizeof(hints));
321 hints.ai_family = PF_UNSPEC;
322 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
323 error = getaddrinfo(rhost, "0", &hints, &res);
324 if (error)
325 return (-1);
326
327 for (r = res; r; r = r->ai_next) {
328 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
329 luser) == 0) {
330 freeaddrinfo(res);
331 return (0);
332 }
333 }
334 freeaddrinfo(res);
335 return (-1);
336}
337
338/*
339 * New .rhosts strategy: We are passed an ip address. We spin through
340 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
341 * has ip addresses, we don't have to trust a nameserver. When it
342 * contains hostnames, we spin through the list of addresses the nameserver
343 * gives us and look for a match.
344 *
345 * Returns 0 if ok, -1 if not ok.
346 */
347int
348iruserok(u_int32_t raddr, int superuser, const char *ruser, const char *luser)
349{
350 struct sockaddr_in sin;
351
352 memset(&sin, 0, sizeof(sin));
353 sin.sin_family = AF_INET;
354 sin.sin_len = sizeof(struct sockaddr_in);
355 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
356 return iruserok_sa(&sin, sizeof(struct sockaddr_in), superuser, ruser,
357 luser);
358}
359
360int
361iruserok_sa(const void *raddr, int rlen, int superuser, const char *ruser,
362 const char *luser)
363{
364 struct sockaddr *sa;
365 char *cp;
366 struct stat sbuf;
367 struct passwd *pwd;
368 FILE *hostf;
369 uid_t uid;
370 int first;
371 char pbuf[MAXPATHLEN];
372
373 sa = (struct sockaddr *)raddr;
374 first = 1;
375 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
376again:
377 if (hostf) {
378 if (__ivaliduser_sa(hostf, sa, rlen, luser, ruser) == 0) {
379 (void)fclose(hostf);
380 return (0);
381 }
382 (void)fclose(hostf);
383 }
384 if (first == 1 && (__check_rhosts_file || superuser)) {
385 int len;
386
387 first = 0;
388 if ((pwd = getpwnam(luser)) == NULL)
389 return (-1);
390 len = snprintf(pbuf, sizeof pbuf, "%s/.rhosts", pwd->pw_dir);
391 if (len < 0 || len >= sizeof pbuf)
392 return (-1);
393
394 /*
395 * Change effective uid while opening .rhosts. If root and
396 * reading an NFS mounted file system, can't read files that
397 * are protected read/write owner only.
398 */
399 uid = geteuid();
400 (void)seteuid(pwd->pw_uid);
401 hostf = fopen(pbuf, "r");
402 (void)seteuid(uid);
403
404 if (hostf == NULL)
405 return (-1);
406 /*
407 * If not a regular file, or is owned by someone other than
408 * user or root or if writeable by anyone but the owner, quit.
409 */
410 cp = NULL;
411 if (lstat(pbuf, &sbuf) < 0)
412 cp = ".rhosts lstat failed";
413 else if (!S_ISREG(sbuf.st_mode))
414 cp = ".rhosts not regular file";
415 else if (fstat(fileno(hostf), &sbuf) < 0)
416 cp = ".rhosts fstat failed";
417 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
418 cp = "bad .rhosts owner";
419 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
420 cp = ".rhosts writable by other than owner";
421 /* If there were any problems, quit. */
422 if (cp) {
423 __rcmd_errstr = cp;
424 (void)fclose(hostf);
425 return (-1);
426 }
427 goto again;
428 }
429 return (-1);
430}
431
432/*
433 * XXX
434 * Don't make static, used by lpd(8).
435 *
436 * Returns 0 if ok, -1 if not ok.
437 */
438int
439__ivaliduser(FILE *hostf, in_addr_t raddrl, const char *luser,
440 const char *ruser)
441{
442 struct sockaddr_in sin;
443
444 memset(&sin, 0, sizeof(sin));
445 sin.sin_family = AF_INET;
446 sin.sin_len = sizeof(struct sockaddr_in);
447 memcpy(&sin.sin_addr, &raddrl, sizeof(sin.sin_addr));
448 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
449 luser, ruser);
450}
451
452int
453__ivaliduser_sa(FILE *hostf, struct sockaddr *raddr, socklen_t salen,
454 const char *luser, const char *ruser)
455{
456 char *user, *p;
457 char *buf;
458 const char *auser, *ahost;
459 int hostok, userok;
460 char *rhost = (char *)-1;
461 char domain[MAXHOSTNAMELEN];
462 size_t buflen;
463
464 getdomainname(domain, sizeof(domain));
465
466 while ((buf = fgetln(hostf, &buflen))) {
467 p = buf;
468 if (*p == '#')
469 continue;
470 while (p < buf + buflen && *p != '\n' && *p != ' ' && *p != '\t') {
471 if (!isprint(*p))
472 goto bail;
473 *p = isupper(*p) ? tolower(*p) : *p;
474 p++;
475 }
476 if (p >= buf + buflen)
477 continue;
478 if (*p == ' ' || *p == '\t') {
479 *p++ = '\0';
480 while (p < buf + buflen && (*p == ' ' || *p == '\t'))
481 p++;
482 if (p >= buf + buflen)
483 continue;
484 user = p;
485 while (p < buf + buflen && *p != '\n' && *p != ' ' &&
486 *p != '\t') {
487 if (!isprint(*p))
488 goto bail;
489 p++;
490 }
491 } else
492 user = p;
493 *p = '\0';
494
495 if (p == buf)
496 continue;
497
498 auser = *user ? user : luser;
499 ahost = buf;
500
501 if (strlen(ahost) >= MAXHOSTNAMELEN)
502 continue;
503
504 /*
505 * innetgr() must lookup a hostname (we do not attempt
506 * to change the semantics so that netgroups may have
507 * #.#.#.# addresses in the list.)
508 */
509 if (ahost[0] == '+')
510 switch (ahost[1]) {
511 case '\0':
512 hostok = 1;
513 break;
514 case '@':
515 if (rhost == (char *)-1)
516 rhost = __gethostloop(raddr, salen);
517 hostok = 0;
518 if (rhost)
519 hostok = innetgr(&ahost[2], rhost,
520 NULL, domain);
521 break;
522 default:
523 hostok = __icheckhost(raddr, salen, &ahost[1]);
524 break;
525 }
526 else if (ahost[0] == '-')
527 switch (ahost[1]) {
528 case '\0':
529 hostok = -1;
530 break;
531 case '@':
532 if (rhost == (char *)-1)
533 rhost = __gethostloop(raddr, salen);
534 hostok = 0;
535 if (rhost)
536 hostok = -innetgr(&ahost[2], rhost,
537 NULL, domain);
538 break;
539 default:
540 hostok = -__icheckhost(raddr, salen, &ahost[1]);
541 break;
542 }
543 else
544 hostok = __icheckhost(raddr, salen, ahost);
545
546
547 if (auser[0] == '+')
548 switch (auser[1]) {
549 case '\0':
550 userok = 1;
551 break;
552 case '@':
553 userok = innetgr(&auser[2], NULL, ruser,
554 domain);
555 break;
556 default:
557 userok = strcmp(ruser, &auser[1]) ? 0 : 1;
558 break;
559 }
560 else if (auser[0] == '-')
561 switch (auser[1]) {
562 case '\0':
563 userok = -1;
564 break;
565 case '@':
566 userok = -innetgr(&auser[2], NULL, ruser,
567 domain);
568 break;
569 default:
570 userok = strcmp(ruser, &auser[1]) ? 0 : -1;
571 break;
572 }
573 else
574 userok = strcmp(ruser, auser) ? 0 : 1;
575
576 /* Check if one component did not match */
577 if (hostok == 0 || userok == 0)
578 continue;
579
580 /* Check if we got a forbidden pair */
581 if (userok <= -1 || hostok <= -1)
582 return (-1);
583
584 /* Check if we got a valid pair */
585 if (hostok >= 1 && userok >= 1)
586 return (0);
587 }
588bail:
589 return (-1);
590}
591
592/*
593 * Returns "true" if match, 0 if no match. If we do not find any
594 * semblance of an A->PTR->A loop, allow a simple #.#.#.# match to work.
595 */
596static int
597__icheckhost(struct sockaddr *raddr, socklen_t salen, const char *lhost)
598{
599 struct addrinfo hints, *res, *r;
600 char h1[NI_MAXHOST], h2[NI_MAXHOST];
601 int error;
602 const int niflags = NI_NUMERICHOST;
603
604 h1[0] = '\0';
605 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
606 niflags) != 0)
607 return (0);
608
609 /* Resolve laddr into sockaddr */
610 memset(&hints, 0, sizeof(hints));
611 hints.ai_family = raddr->sa_family;
612 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
613 res = NULL;
614 error = getaddrinfo(lhost, "0", &hints, &res);
615 if (error)
616 return (0);
617
618 /*
619 * Try string comparisons between raddr and laddr.
620 */
621 for (r = res; r; r = r->ai_next) {
622 h2[0] = '\0';
623 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
624 NULL, 0, niflags) != 0)
625 continue;
626 if (strcmp(h1, h2) == 0) {
627 freeaddrinfo(res);
628 return (1);
629 }
630 }
631
632 /* No match. */
633 freeaddrinfo(res);
634 return (0);
635}
636
637/*
638 * Return the hostname associated with the supplied address.
639 * Do a reverse lookup as well for security. If a loop cannot
640 * be found, pack the result of inet_ntoa() into the string.
641 */
642static char *
643__gethostloop(struct sockaddr *raddr, socklen_t salen)
644{
645 static char remotehost[NI_MAXHOST];
646 char h1[NI_MAXHOST], h2[NI_MAXHOST];
647 struct addrinfo hints, *res, *r;
648 int error;
649 const int niflags = NI_NUMERICHOST;
650
651 h1[0] = remotehost[0] = '\0';
652 if (getnameinfo(raddr, salen, remotehost, sizeof(remotehost),
653 NULL, 0, NI_NAMEREQD) != 0)
654 return (NULL);
655 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
656 niflags) != 0)
657 return (NULL);
658
659 /*
660 * Look up the name and check that the supplied
661 * address is in the list
662 */
663 memset(&hints, 0, sizeof(hints));
664 hints.ai_family = raddr->sa_family;
665 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
666 hints.ai_flags = AI_CANONNAME;
667 res = NULL;
668 error = getaddrinfo(remotehost, "0", &hints, &res);
669 if (error)
670 return (NULL);
671
672 for (r = res; r; r = r->ai_next) {
673 h2[0] = '\0';
674 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
675 NULL, 0, niflags) != 0)
676 continue;
677 if (strcmp(h1, h2) == 0) {
678 freeaddrinfo(res);
679 return (remotehost);
680 }
681 }
682
683 /*
684 * either the DNS adminstrator has made a configuration
685 * mistake, or someone has attempted to spoof us
686 */
687 syslog(LOG_NOTICE, "rcmd: address %s not listed for host %s",
688 h1, res->ai_canonname ? res->ai_canonname : remotehost);
689 freeaddrinfo(res);
690 return (NULL);
691}
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