source: trunk/src/sh_portcheck.c@ 127

Last change on this file since 127 was 127, checked in by rainer, 17 years ago

New portcheck option to ignore some ports.
  • Property svn:executable set to *
File size: 34.6 KB
Line 
1/* SAMHAIN file system integrity testing */
2/* Copyright (C) 2006 Rainer Wichmann */
3/* */
4/* This program is free software; you can redistribute it */
5/* and/or modify */
6/* it under the terms of the GNU General Public License as */
7/* published by */
8/* the Free Software Foundation; either version 2 of the License, or */
9/* (at your option) any later version. */
10/* */
11/* This program is distributed in the hope that it will be useful, */
12/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
13/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
14/* GNU General Public License for more details. */
15/* */
16/* You should have received a copy of the GNU General Public License */
17/* along with this program; if not, write to the Free Software */
18/* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19
20/***************************************************************************
21 *
22 * This file provides a module for samhain to check for open ports
23 * on the local machine.
24 *
25 */
26
27
28/* #define TEST_ONLY */
29#ifndef TEST_ONLY
30#include "config_xor.h"
31#endif
32
33#include <stdio.h>
34#include <string.h>
35#include <sys/types.h>
36#include <sys/socket.h>
37#include <netinet/in.h>
38#include <arpa/inet.h>
39#include <errno.h>
40#include <unistd.h>
41#include <fcntl.h>
42
43#define PORTCHK_VERSION "1.0"
44
45#if defined(TEST_ONLY) || (defined(SH_USE_PORTCHECK) && (defined (SH_WITH_CLIENT) || defined (SH_STANDALONE)))
46
47
48#define PORTMAP
49#include <rpc/rpc.h>
50#ifdef HAVE_RPC_RPCENT_H
51#include <rpc/rpcent.h>
52#endif
53#include <rpc/pmap_clnt.h>
54#include <rpc/pmap_prot.h>
55#include <netdb.h>
56
57/*
58 * struct pmaplist {
59 * struct pmap pml_map;
60 * struct pmaplist *pml_next;
61 * };
62 */
63
64/* struct pmap {
65 * long unsigned pm_prog;
66 * long unsigned pm_vers;
67 * long unsigned pm_prot;
68 * long unsigned pm_port;
69 * };
70 */
71
72/* TIME_WAIT ? 60-240 seconds */
73
74/* the size of an interface string
75 */
76#define SH_INTERFACE_SIZE 16
77
78#define SH_PORT_NOT 0
79#define SH_PORT_REQ 1
80#define SH_PORT_OPT 2
81#define SH_PORT_IGN 3
82
83#define SH_PORT_MISS 0
84#define SH_PORT_ISOK 1
85#define SH_PORT_UNKN 2
86
87#define SH_PORT_NOREPT 0
88#define SH_PORT_REPORT 1
89
90struct sh_portentry {
91 int port;
92 char interface[SH_INTERFACE_SIZE];
93 char * service;
94 char * error;
95 int flag; /* required or not */
96 int status; /* missing or not */
97 struct sh_portentry * next;
98};
99
100static struct sh_portentry * portlist_tcp = NULL;
101static struct sh_portentry * portlist_udp = NULL;
102
103#define SH_PORTCHK_INTERVAL 300
104
105static int sh_portchk_check_udp = 1;
106static int sh_portchk_active = 1;
107static int sh_portchk_interval = SH_PORTCHK_INTERVAL;
108#if !defined(TEST_ONLY)
109
110#define FIL__ _("sh_portcheck.c")
111#include "samhain.h"
112#include "sh_error.h"
113#include "sh_mem.h"
114#include "sh_calls.h"
115#include "sh_utils.h"
116#include "sh_modules.h"
117
118static int sh_portchk_severity = SH_ERR_SEVERE;
119#endif
120
121/* Exported interface to add ignoreable ports as 'iface:portlist'
122 */
123static int sh_portchk_add_ignore (const char * str);
124
125/* Exported interface to add required ports as 'iface:portlist'
126 */
127static int sh_portchk_add_required (const char * str);
128
129/* Exported interface to add optional ports as 'iface:portlist'
130 */
131static int sh_portchk_add_optional (const char * str);
132
133/* Exported interface to add an ethernet interface
134 */
135static int sh_portchk_add_interface (const char * str);
136
137
138#ifndef TEST_ONLY
139
140static int sh_portchk_set_interval (const char * c)
141{
142 int retval = 0;
143 long val;
144
145 SL_ENTER(_("sh_portchk_set_interval"));
146 val = strtol (c, (char **)NULL, 10);
147 if (val <= 0)
148 {
149 sh_error_handle ((-1), FIL__, __LINE__, EINVAL, MSG_EINVALS,
150 _("port check interval"), c);
151 retval = -1;
152 }
153
154 val = (val <= 0 ? 60 : val);
155
156 sh_portchk_interval = (time_t) val;
157 SL_RETURN(0, _("sh_portchk_set_interval"));
158}
159
160
161static int sh_portchk_set_active (const char * str)
162{
163 return sh_util_flagval(str, &sh_portchk_active);
164}
165
166static int sh_portchk_set_udp (const char * str)
167{
168 return sh_util_flagval(str, &sh_portchk_check_udp);
169}
170
171static int sh_portchk_set_severity (const char * str)
172{
173 char tmp[32];
174 tmp[0] = '='; tmp[1] = '\0';
175 sl_strlcat (tmp, str, 32);
176 return sh_error_set_level (tmp, &sh_portchk_severity);
177}
178
179sh_rconf sh_portchk_table[] = {
180 {
181 N_("severityportcheck"),
182 sh_portchk_set_severity,
183 },
184 {
185 N_("portcheckrequired"),
186 sh_portchk_add_required,
187 },
188 {
189 N_("portcheckoptional"),
190 sh_portchk_add_optional,
191 },
192 {
193 N_("portcheckignore"),
194 sh_portchk_add_ignore,
195 },
196 {
197 N_("portcheckactive"),
198 sh_portchk_set_active,
199 },
200 {
201 N_("portcheckinterface"),
202 sh_portchk_add_interface,
203 },
204 {
205 N_("portcheckinterval"),
206 sh_portchk_set_interval,
207 },
208 {
209 N_("portcheckudp"),
210 sh_portchk_set_udp,
211 },
212 {
213 NULL,
214 NULL
215 }
216};
217
218#endif
219
220/* Interface to initialize port check
221 */
222int sh_portchk_init ();
223
224/* Interface to reset port check
225 */
226int sh_portchk_reset ();
227
228/* Interface to run port check
229 */
230int sh_portchk_check ();
231
232
233static char * check_services (int port, char * proto);
234
235#ifdef TEST_ONLY
236
237static int portchk_debug = 0;
238#define SH_ALLOC malloc
239#define SH_FREE free
240#define sh_util_strdup strdup
241#define sl_strlcpy strncpy
242#define _(a) a
243
244#else
245
246static int portchk_debug = 0;
247
248#endif
249
250static void sh_portchk_add_to_list (char * proto,
251 int port, struct in_addr haddr, char * service,
252 int flag, int status)
253{
254 struct sh_portentry * new = SH_ALLOC (sizeof(struct sh_portentry));
255
256 if (portchk_debug)
257 fprintf(stderr, _("add to list: port %d/%s %d %d (%s)\n"),
258 port, proto, flag, status, service ? service : _("undef"));
259
260 new->port = port;
261 sl_strlcpy (new->interface, inet_ntoa(haddr), SH_INTERFACE_SIZE);
262 new->status = status;
263 new->flag = flag;
264
265 new->error = NULL;
266
267 if (service)
268 new->service = sh_util_strdup (service);
269 else
270 new->service = NULL;
271 if (0 == strcmp(proto, "tcp"))
272 {
273 new->next = portlist_tcp;
274 portlist_tcp = new;
275 }
276 else
277 {
278 new->next = portlist_udp;
279 portlist_udp = new;
280 }
281 return;
282}
283
284/* Reset the list by setting all entries to UNKN.
285 * In the next cycle we will check, and set found ports to ISOK.
286 * Thereafter, we check for entries that are still UNKN.
287 */
288static void sh_portchk_reset_lists ()
289{
290 struct sh_portentry * portlist;
291
292 portlist = portlist_tcp;
293 while (portlist)
294 {
295 if (portlist->status != SH_PORT_MISS)
296 portlist->status = SH_PORT_UNKN;
297 portlist = portlist->next;
298 }
299 portlist = portlist_udp;
300 while (portlist)
301 {
302 if (portlist->status != SH_PORT_MISS)
303 portlist->status = SH_PORT_UNKN;
304 portlist = portlist->next;
305 }
306 return;
307}
308
309static struct sh_portentry * sh_portchk_kill_list (struct sh_portentry * head)
310{
311 if (head)
312 {
313 if (head->next)
314 sh_portchk_kill_list (head->next);
315
316 if (head->service)
317 SH_FREE(head->service);
318 SH_FREE(head);
319 }
320 return NULL;
321}
322
323/* check the list of open ports for any that are marked as UNKN
324 */
325static void sh_portchk_check_list (struct sh_portentry ** head, char * proto, int report)
326{
327 struct sh_portentry * ptr = *head;
328 struct sh_portentry * pre = *head;
329 char errbuf[256];
330
331 while (ptr)
332 {
333 if (portchk_debug && report)
334 fprintf(stderr, _("check list: port %d/%s %d %d\n"),
335 ptr->port, proto, ptr->flag, ptr->status);
336
337 if (ptr->status == SH_PORT_UNKN)
338 {
339 /* Don't report missing ports that are marked as optional
340 */
341 if (ptr->flag != SH_PORT_OPT && ptr->flag != SH_PORT_IGN)
342 {
343 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServiceMissing] port %s:%d/%s (%s)"),
344 ptr->interface, ptr->port, proto,
345 ptr->service ? ptr->service : check_services(ptr->port, proto));
346#ifdef TEST_ONLY
347 if (report == SH_PORT_REPORT)
348 fprintf(stderr, _("%s\n"), errbuf);
349#else
350 if (report == SH_PORT_REPORT)
351 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
352 MSG_PORT_REPORT, errbuf);
353#endif
354 }
355
356 ptr->status = SH_PORT_MISS;
357
358 if ((ptr->flag != SH_PORT_REQ) && (ptr->flag != SH_PORT_OPT))
359 {
360 if (portchk_debug && report)
361 fprintf(stderr, _("removing: port %d/%s %d %d\n"),
362 ptr->port, proto, ptr->flag, ptr->status);
363
364 if (ptr == *head)
365 {
366 *head = ptr->next;
367 if (ptr->service)
368 SH_FREE(ptr->service);
369 SH_FREE(ptr);
370 ptr = *head;
371 pre = *head;
372 continue;
373 }
374 else if (ptr->next == NULL)
375 {
376 pre->next = NULL;
377 if (ptr->service)
378 SH_FREE(ptr->service);
379 SH_FREE(ptr);
380 return;
381 }
382 else
383 {
384 pre->next = ptr->next;
385 if (ptr->service)
386 SH_FREE(ptr->service);
387 SH_FREE(ptr);
388 ptr = pre->next;
389 continue;
390 }
391 }
392 }
393 pre = ptr;
394 ptr = ptr->next;
395 }
396 return;
397}
398
399
400static struct sh_portentry * sh_portchk_get_from_list (char * proto, int port,
401 struct in_addr haddr, char * service)
402{
403 struct sh_portentry * portlist;
404 char iface_all[8];
405
406 sl_strlcpy (iface_all, _("0.0.0.0"), sizeof(iface_all));
407
408 if (0 == strcmp(proto, "tcp"))
409 portlist = portlist_tcp;
410 else
411 portlist = portlist_udp;
412
413 if (service)
414 {
415 while (portlist)
416 {
417 if (portlist->service &&
418 0 == strcmp(service, portlist->service) &&
419 (0 == strcmp(portlist->interface, inet_ntoa(haddr)) ||
420 0 == strcmp(portlist->interface, iface_all)))
421 return portlist;
422 portlist = portlist->next;
423 }
424 }
425 else
426 {
427 while (portlist)
428 {
429 if (port == portlist->port &&
430 (0 == strcmp(portlist->interface, inet_ntoa(haddr)) ||
431 0 == strcmp(portlist->interface, iface_all)))
432 return portlist;
433 portlist = portlist->next;
434 }
435 }
436 return NULL;
437}
438
439
440static void sh_portchk_cmp_to_list (char * proto, int port, struct in_addr haddr, char * service)
441{
442 struct sh_portentry * portent;
443 char errbuf[256];
444
445
446 portent = sh_portchk_get_from_list (proto, port, haddr, service);
447
448 if (service)
449 {
450 if (!portent)
451 {
452 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServiceNew] port %s:%d/%s (%s)"),
453 inet_ntoa(haddr), port, proto, service);
454#ifdef TEST_ONLY
455 fprintf(stderr, _("open port: %s:%d/%s (%s)\n"),
456 inet_ntoa(haddr), port, proto, service);
457#else
458 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
459 MSG_PORT_REPORT, errbuf);
460#endif
461 /*
462 * was not there, thus it is not in 'required' or 'optional' list
463 */
464 sh_portchk_add_to_list (proto, port, haddr, service, SH_PORT_NOT, SH_PORT_ISOK);
465 }
466 else if (portent->status == SH_PORT_MISS && portent->flag != SH_PORT_IGN)
467 {
468 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServiceRestarted] port %s:%d/%s to %d/%s (%s)"),
469 inet_ntoa(haddr), portent->port, proto, port, proto, service);
470#ifdef TEST_ONLY
471 fprintf(stderr, _("service: %s\n"), errbuf);
472#else
473 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
474 MSG_PORT_REPORT, errbuf);
475#endif
476
477 portent->status = SH_PORT_ISOK;
478 }
479 else if (port != portent->port && (-1) != portent->port)
480 {
481 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServicePortSwitch] port %s:%d/%s to %d/%s (%s)"),
482 inet_ntoa(haddr), portent->port, proto, port, proto, service);
483#ifdef TEST_ONLY
484 fprintf(stderr, _("service: %s\n"), errbuf);
485#else
486 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
487 MSG_PORT_REPORT, errbuf);
488#endif
489 portent->port = port;
490 portent->status = SH_PORT_ISOK;
491 }
492 else
493 {
494 portent->status = SH_PORT_ISOK;
495 }
496 }
497 else
498 {
499 if (!portent)
500 {
501 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServiceNew] port %s:%d/%s (%s)"),
502 inet_ntoa(haddr), port, proto, check_services(port, proto));
503#ifdef TEST_ONLY
504 fprintf(stderr, _("open port: %s:%d/%s (%s)\n"),
505 inet_ntoa(haddr), port, proto, check_services(port, proto));
506#else
507 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
508 MSG_PORT_REPORT, errbuf);
509#endif
510
511 /* was not there, thus it is not in 'required' or 'optional' list
512 */
513 sh_portchk_add_to_list (proto, port, haddr, service, SH_PORT_NOT, SH_PORT_ISOK);
514 }
515 else if (portent->status == SH_PORT_MISS && portent->flag != SH_PORT_IGN)
516 {
517 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServiceRestarted] port %s:%d/%s (%s)"),
518 inet_ntoa(haddr), port, proto, check_services(port, proto));
519#ifdef TEST_ONLY
520 fprintf(stderr, _("port : %s\n"), errbuf);
521#else
522 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
523 MSG_PORT_REPORT, errbuf);
524#endif
525
526 portent->status = SH_PORT_ISOK;
527 }
528 else
529 {
530 portent->status = SH_PORT_ISOK;
531 }
532 }
533
534 return;
535}
536
537
538/* Returns a static buffer containing the name of the service
539 * running on port <port> (from /etc/services)
540 * Returns NULL on failure
541 */
542static char * check_services (int port, char * proto)
543{
544 static char buf[256];
545 struct servent * service = getservbyport(htons(port), proto);
546
547 if (service && service->s_name && service->s_name[0] != '\0')
548 {
549 snprintf (buf, sizeof(buf), _("maybe_%s"), service->s_name);
550 }
551 else
552 {
553 snprintf (buf, sizeof(buf), _("unknown"));
554 }
555 return buf;
556}
557
558/* Returns a static buffer containing the name of the service
559 * running on port <port> at <address> (from portmap daemon)
560 * Returns NULL on failure
561 */
562static char * check_rpc_list (int port, struct sockaddr_in * address,
563 unsigned long prot)
564{
565 struct pmaplist * head;
566 struct rpcent *r;
567 static char buf[256];
568
569 head = pmap_getmaps(address);
570
571 if (head)
572 {
573 do /* while (head != NULL) */
574 {
575 if ((head->pml_map.pm_prot == prot) &&
576 (port == (int)head->pml_map.pm_port))
577 {
578 r = getrpcbynumber((int)head->pml_map.pm_prog);
579 if (r && r->r_name && r->r_name[0] != '\0')
580 {
581 snprintf (buf, sizeof(buf), "%s", r->r_name);
582 return buf;
583 }
584 else
585 {
586 snprintf (buf, sizeof(buf), "RPC_%lu",
587 (unsigned long)head->pml_map.pm_prog);
588 return buf;
589 }
590 }
591 head = head->pml_next;
592 }
593 while (head != NULL);
594 }
595
596 return NULL;
597}
598
599static int check_port_udp_internal (int fd, int port, struct in_addr haddr)
600{
601 struct sockaddr_in sinr;
602 /* struct in_addr haddr; */
603 int retval;
604 char * p;
605 char buf[8];
606#ifndef TEST_ONLY
607 char errmsg[256];
608 int nerr;
609#endif
610
611 /* inet_aton(interface, &haddr); */
612
613 sinr.sin_family = AF_INET;
614 sinr.sin_port = htons (port);
615 sinr.sin_addr = haddr;
616
617 do {
618 retval = connect(fd, (struct sockaddr *) &sinr, sizeof(sinr));
619 } while (retval < 0 && errno == EINTR);
620
621 if (retval == -1)
622 {
623#ifdef TEST_ONLY
624 if (portchk_debug)
625 perror(_("connect"));
626#else
627 nerr = errno;
628 sl_snprintf(errmsg, sizeof(errmsg), _("check port: %5d/udp on %15s: %s"),
629 port, inet_ntoa(haddr), sh_error_message(errno));
630 sh_error_handle((-1), FIL__, __LINE__, nerr, MSG_E_SUBGEN,
631 errmsg, _("connect"));
632#endif
633 }
634 else
635 {
636 do {
637 retval = send (fd, buf, 0, 0);
638 } while (retval < 0 && errno == EINTR);
639
640 if (retval == -1 && errno == ECONNREFUSED)
641 {
642 if (portchk_debug)
643 fprintf(stderr, _("check port: %5d/udp on %15s established/time_wait\n"),
644 port, inet_ntoa(haddr));
645 }
646 else
647 {
648 /* Only the second send() may catch the error
649 */
650 do {
651 retval = send (fd, buf, 0, 0);
652 } while (retval < 0 && errno == EINTR);
653
654 if (retval == -1 && errno == ECONNREFUSED)
655 {
656 if (portchk_debug)
657 fprintf(stderr, _("check port: %5d/udp on %15s established/time_wait\n"),
658 port, inet_ntoa(haddr));
659 }
660 else if (retval != -1)
661 {
662 /* Try to get service name from portmap
663 */
664 p = check_rpc_list (port, &sinr, IPPROTO_UDP);
665
666 sh_portchk_cmp_to_list ("udp", port, haddr, p ? p : NULL);
667
668 /* If not an RPC service, try to get name from /etc/services
669 */
670 if (!p)
671 p = check_services(port, "udp");
672
673 if (portchk_debug)
674 fprintf(stderr, _("check port: %5d/udp on %15s open %s\n"),
675 port, inet_ntoa(haddr), p);
676
677 }
678 }
679 }
680 close (fd);
681 return 0;
682}
683
684static int check_port_tcp_internal (int fd, int port, struct in_addr haddr)
685{
686 struct sockaddr_in sinr;
687 /* struct in_addr haddr; */
688 int retval;
689 int flags;
690 char * p;
691#ifndef TEST_ONLY
692 char errmsg[256];
693 int nerr;
694#endif
695
696
697 /* inet_aton(interface, &haddr); */
698
699 sinr.sin_family = AF_INET;
700 sinr.sin_port = htons (port);
701 sinr.sin_addr = haddr;
702
703 do {
704 retval = connect(fd, (struct sockaddr *) &sinr, sizeof(sinr));
705 } while (retval < 0 && errno == EINTR);
706
707 if (retval == -1 && errno == ECONNREFUSED)
708 {
709 if (portchk_debug)
710 fprintf(stderr, _("check port: %5d on %15s established/time_wait\n"),
711 port, inet_ntoa(haddr));
712 }
713 else if (retval == -1)
714 {
715#ifdef TEST_ONLY
716 if (portchk_debug)
717 perror(_("connect"));
718#else
719 nerr = errno;
720 sl_snprintf(errmsg, sizeof(errmsg), _("check port: %5d/tcp on %15s: %s"),
721 port, inet_ntoa(haddr), sh_error_message(errno));
722 sh_error_handle((-1), FIL__, __LINE__, nerr, MSG_E_SUBGEN,
723 errmsg, _("connect"));
724#endif
725 }
726 else
727 {
728 /* Try to get service name from portmap
729 */
730 p = check_rpc_list (port, &sinr, IPPROTO_TCP);
731
732 sh_portchk_cmp_to_list ("tcp", port, haddr, p ? p : NULL);
733
734 /* If not an RPC service, try to get name from /etc/services
735 */
736 if (!p)
737 p = check_services(port, "tcp");
738
739 if (portchk_debug)
740 fprintf(stderr, _("check port: %5d on %15s open %s\n"),
741 port, inet_ntoa(haddr), p);
742
743#if !defined(O_NONBLOCK)
744#if defined(O_NDELAY)
745#define O_NONBLOCK O_NDELAY
746#else
747#define O_NONBLOCK 0
748#endif
749#endif
750
751 /* prepare to close connection gracefully
752 */
753 if (port == 22) /* ssh */
754 {
755 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
756 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
757 write (fd, _("SSH-2.0-Foobar"), 14);
758 write (fd, "\r\n", 2);
759 }
760 else if (port == 25) /* smtp */
761 {
762 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
763 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
764 write (fd, _("QUIT"), 4);
765 write (fd, "\r\n", 2);
766 }
767 else if (port == 79) /* finger */
768 {
769 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
770 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
771 write (fd, "\r\n", 2);
772 }
773 else if (port == 110) /* pop3 */
774 {
775 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
776 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
777 write (fd, _("QUIT"), 4);
778 write (fd, "\r\n", 2);
779 }
780 else if (port == 143) /* imap */
781 {
782 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
783 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
784 write (fd, _("A01 LOGOUT"), 10);
785 write (fd, "\r\n", 2);
786 }
787 }
788 close (fd);
789 return 0;
790}
791
792/* typedef uint32_t in_addr_t;
793 * struct in_addr
794 * {
795 * in_addr_t s_addr;
796 * };
797 */
798
799#define SH_IFACE_MAX 16
800
801struct portchk_interfaces {
802 struct in_addr iface[SH_IFACE_MAX];
803 int used;
804};
805
806static struct portchk_interfaces iface_list;
807static int iface_initialized = 0;
808
809#ifdef TEST_ONLY
810static char * portchk_hostname = NULL;
811#else
812static char * portchk_hostname = sh.host.name;
813#endif
814
815int sh_portchk_init ()
816{
817 struct hostent * hent;
818 int i = 0;
819 char errbuf[256];
820
821 if (portchk_debug)
822 fprintf(stderr, _("checking ports on: %s\n"), portchk_hostname ? portchk_hostname : _("NULL"));
823
824 if (!portchk_hostname)
825 return -1;
826
827 if (sh_portchk_active == S_FALSE)
828 return -1;
829
830 if (iface_initialized == 0)
831 {
832 iface_list.used = 0;
833 iface_initialized = 1;
834 }
835
836 hent = gethostbyname(portchk_hostname);
837
838 while (hent && hent->h_addr_list[i] && (iface_list.used < SH_IFACE_MAX))
839 {
840 memcpy (&(iface_list.iface[iface_list.used].s_addr), hent->h_addr_list[i], sizeof(in_addr_t));
841 sl_snprintf(errbuf, sizeof(errbuf), _("interface: %s"),
842 inet_ntoa(iface_list.iface[iface_list.used]));
843 sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
844 errbuf, _("sh_portchk_init"));
845
846 ++iface_list.used;
847 ++i;
848 }
849
850 return 0;
851}
852
853#if !defined(TEST_ONLY)
854int sh_portchk_reconf ()
855{
856 iface_initialized = 0;
857
858 sh_portchk_active = 1;
859 sh_portchk_check_udp = 1;
860
861 portlist_udp = sh_portchk_kill_list (portlist_udp);
862 portlist_tcp = sh_portchk_kill_list (portlist_tcp);
863 return 0;
864}
865
866int sh_portchk_cleanup ()
867{
868 return sh_portchk_reconf ();
869}
870
871int sh_portchk_timer (time_t tcurrent)
872{
873 static time_t lastcheck = 0;
874
875 SL_ENTER(_("sh_portchk_timer"));
876 if ((time_t) (tcurrent - lastcheck) >= sh_portchk_interval)
877 {
878 lastcheck = tcurrent;
879 SL_RETURN((-1), _("sh_portchk_timer"));
880 }
881 SL_RETURN(0, _("sh_portchk_timer"));
882}
883#endif
884
885static int check_port_generic (int port, int type, int protocol)
886{
887 int i = 0;
888 int sock = -1;
889 int flag = 1; /* non-zero to enable an option */
890 struct in_addr haddr;
891
892 /* Check all interfaces for this host
893 */
894 while (i < iface_list.used)
895 {
896 if ((sock = socket(AF_INET, type, protocol)) < 0 )
897 {
898#ifdef TEST_ONLY
899 if (portchk_debug)
900 perror(_("socket"));
901#else
902 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
903 sh_error_message(errno), _("socket"));
904#endif
905 }
906 if ( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
907 (void *) &flag, sizeof(flag)) < 0 )
908 {
909#ifdef TEST_ONLY
910 if (portchk_debug)
911 perror(_("setsockopt"));
912#else
913 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
914 sh_error_message(errno), _("setsockopt"));
915#endif
916 }
917
918 memcpy (&(haddr.s_addr), &(iface_list.iface[i].s_addr), sizeof(in_addr_t));
919
920 if (protocol == IPPROTO_TCP)
921 check_port_tcp_internal(sock, port, haddr);
922 else
923 check_port_udp_internal(sock, port, haddr);
924
925 ++i;
926 }
927
928 return 0;
929}
930
931
932
933static int check_port_udp (int port)
934{
935 return check_port_generic(port, SOCK_DGRAM, IPPROTO_UDP);
936}
937
938static int check_port_tcp (int port)
939{
940 return check_port_generic(port, SOCK_STREAM, IPPROTO_TCP);
941}
942
943
944
945static int sh_portchk_scan_ports_generic (int min_port, int max_port, int type, int protocol)
946{
947 /*
948 int min_port = 1024;
949 int max_port = 65535;
950 */
951
952 int port;
953 int retval;
954 int sock = -1;
955 int flag = 1; /* non-zero to enable an option */
956
957 struct sockaddr_in addr;
958 int addrlen = sizeof(addr);
959
960 if (min_port == -1)
961 min_port = 0;
962 if (max_port == -1)
963 max_port = 65535;
964
965 for (port = min_port; port <= max_port; ++port)
966 {
967
968 if ((sock = socket(AF_INET, type, protocol)) < 0 )
969 {
970#ifdef TEST_ONLY
971 if (portchk_debug)
972 perror(_("socket"));
973#else
974 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
975 sh_error_message(errno), _("socket"));
976#endif
977 }
978 if ( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
979 (void *) &flag, sizeof(flag)) < 0 )
980 {
981#ifdef TEST_ONLY
982 if (portchk_debug)
983 perror(_("setsockopt"));
984#else
985 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
986 sh_error_message(errno), _("setsockopt"));
987#endif
988 }
989
990 addr.sin_family = AF_INET;
991 addr.sin_port = htons(port);
992 addr.sin_addr.s_addr = INADDR_ANY;
993
994 retval = bind (sock, (struct sockaddr *) &addr, addrlen);
995
996 if (retval == 0)
997 {
998 /* we can bind the port, thus it is unused
999 */
1000 close (sock);
1001 }
1002 else
1003 {
1004 if (errno == EINVAL || errno == EADDRINUSE)
1005 {
1006 /* try to connect to the port
1007 */
1008 if (protocol == IPPROTO_TCP)
1009 check_port_tcp(port);
1010 else
1011 check_port_udp(port);
1012 }
1013 else
1014 {
1015#ifdef TEST_ONLY
1016 if (portchk_debug)
1017 perror(_("bind"));
1018#else
1019 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1020 sh_error_message(errno), _("bind"));
1021#endif
1022 }
1023 close (sock);
1024 }
1025 }
1026 return 0;
1027}
1028
1029static int sh_portchk_scan_ports_tcp (int min_port, int max_port)
1030{
1031 return sh_portchk_scan_ports_generic (min_port, max_port, SOCK_STREAM, IPPROTO_TCP);
1032}
1033
1034static int sh_portchk_scan_ports_udp (int min_port, int max_port)
1035{
1036 return sh_portchk_scan_ports_generic (min_port, max_port, SOCK_DGRAM, IPPROTO_UDP);
1037}
1038
1039/* Subroutine to add an interface
1040 */
1041static int sh_portchk_add_interface (const char * str)
1042{
1043 struct in_addr haddr;
1044 char errbuf[256];
1045
1046 if (iface_initialized == 0)
1047 {
1048 iface_list.used = 0;
1049 iface_initialized = 1;
1050 }
1051
1052 if (0 == inet_aton(str, &haddr))
1053 return -1;
1054
1055 if (iface_list.used == SH_IFACE_MAX)
1056 return -1;
1057
1058 sl_snprintf(errbuf, sizeof(errbuf), _("interface: %s"), inet_ntoa(haddr));
1059 sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1060 errbuf, _("sh_portchk_add_interface"));
1061
1062 memcpy (&(iface_list.iface[iface_list.used].s_addr), &(haddr.s_addr), sizeof(in_addr_t));
1063 ++iface_list.used;
1064
1065 return 0;
1066}
1067
1068
1069/* Subroutine to add a required or optional port/service
1070 */
1071static int sh_portchk_add_required_port_generic (char * service, char * interface, int type)
1072{
1073 char buf[256];
1074 char proto[4];
1075 char * p;
1076 char * endptr;
1077 unsigned long int port;
1078 struct in_addr haddr;
1079 struct sh_portentry * portent;
1080
1081 if (0 == inet_aton(interface, &haddr))
1082 return -1;
1083
1084 sl_strlcpy (buf, service, sizeof(buf));
1085
1086 p = strchr(buf, '/');
1087 if (!p)
1088 return -1;
1089 if (0 == strcmp(p, _("/tcp")))
1090 sl_strlcpy(proto, _("tcp"), sizeof(proto));
1091 else if (0 == strcmp(p, _("/udp")))
1092 sl_strlcpy(proto, _("udp"), sizeof(proto));
1093 else
1094 return -1;
1095
1096 *p = '\0';
1097 port = strtoul(buf, &endptr, 0);
1098
1099 if (*endptr != '\0')
1100 {
1101 portent = sh_portchk_get_from_list (proto, -1, haddr, buf);
1102 if (!portent)
1103 sh_portchk_add_to_list (proto, -1, haddr, buf, type, SH_PORT_UNKN);
1104 else
1105 {
1106#ifdef TEST_ONLY
1107 fprintf(stderr, "** WARNING: duplicate port definition %s/%s\n", buf, proto);
1108#else
1109 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1110 _("duplicate port definition"), _("sh_portchk_add_required_port_generic"));
1111#endif
1112 return -1;
1113 }
1114 }
1115 else if (port <= 65535)
1116 {
1117 portent = sh_portchk_get_from_list (proto, port, haddr, NULL);
1118 if (!portent)
1119 sh_portchk_add_to_list (proto, port, haddr, NULL, type, SH_PORT_UNKN);
1120 else
1121 {
1122#ifdef TEST_ONLY
1123 fprintf(stderr, "** WARNING: duplicate port definition %lu/%s\n", port, proto);
1124#else
1125 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1126 _("duplicate port definition"), _("sh_portchk_add_required_port_generic"));
1127#endif
1128 return -1;
1129 }
1130 }
1131 else
1132 return -1;
1133
1134 return 0;
1135}
1136
1137/* Internal interface to add required or optional ports as 'iface:portlist'
1138 */
1139static int sh_portchk_add_required_generic (const char * str, int type)
1140{
1141 size_t len;
1142 size_t ll = 0;
1143
1144 char * interface = NULL;
1145 char * list;
1146 char * p;
1147
1148 if (!str)
1149 return -1;
1150
1151 if (strchr(str, ':'))
1152 {
1153 len = strlen(str);
1154 for (ll = 0; ll < len; ++ll)
1155 {
1156 if (str[ll] == ':' || str[ll] == ' ' || str[ll] == '\t')
1157 {
1158 interface = SH_ALLOC(ll+1);
1159 sl_strlcpy(interface, str, ll+1);
1160 interface[ll] = '\0';
1161 while (str[ll] == ':' || str[ll] == ' ' || str[ll] == '\t')
1162 ++ll;
1163 break;
1164 }
1165 }
1166 }
1167 else
1168 {
1169 interface = SH_ALLOC(8);
1170 sl_strlcpy(interface, _("0.0.0.0"), 8);
1171 interface[7] = '\0';
1172 while (str[ll] == ' ' || str[ll] == '\t')
1173 ++ll;
1174 }
1175
1176 if (!interface)
1177 return -1;
1178
1179 if (str[ll] == '\0')
1180 {
1181 SH_FREE(interface);
1182 return -1;
1183 }
1184
1185 if (portchk_debug)
1186 fprintf(stderr, "add ports for interface: %s\n", interface);
1187
1188 list = sh_util_strdup(&str[ll]);
1189 p = strtok (list, " ,\t");
1190 if (!p)
1191 {
1192 SH_FREE(interface);
1193 SH_FREE(list);
1194 return -1;
1195 }
1196 while (p)
1197 {
1198 if (-1 == sh_portchk_add_required_port_generic (p, interface, type))
1199 {
1200 SH_FREE(interface);
1201 SH_FREE(list);
1202 return -1;
1203 }
1204 p = strtok (NULL, " ,\t");
1205 }
1206 SH_FREE(interface);
1207 SH_FREE(list);
1208 return 0;
1209}
1210
1211/* User interface to add required ports as 'iface:portlist'
1212 */
1213static int sh_portchk_add_required (const char * str)
1214{
1215 return sh_portchk_add_required_generic (str, SH_PORT_REQ);
1216}
1217
1218/* User interface to add optional ports as 'iface:portlist'
1219 */
1220static int sh_portchk_add_optional (const char * str)
1221{
1222 return sh_portchk_add_required_generic (str, SH_PORT_OPT);
1223}
1224
1225/* User interface to add ignoreable ports as 'iface:portlist'
1226 */
1227static int sh_portchk_add_ignore (const char * str)
1228{
1229 return sh_portchk_add_required_generic (str, SH_PORT_IGN);
1230}
1231
1232/* Interface to run port check
1233 */
1234int sh_portchk_check ()
1235{
1236 int min_port = 0;
1237
1238 if (sh_portchk_active != S_FALSE)
1239 {
1240 sh_portchk_reset_lists();
1241 if (0 != geteuid())
1242 {
1243 min_port = 1024;
1244#ifdef TEST_ONLY
1245 fprintf(stderr, "** WARNING not scanning ports < 1024\n");
1246#else
1247 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1248 _("not scanning ports below 1024"), _("sh_portchk_check"));
1249#endif
1250 }
1251 if (sh_portchk_check_udp == 1)
1252 sh_portchk_scan_ports_udp(min_port, -1);
1253 sh_portchk_scan_ports_tcp(min_port, -1);
1254 sh_portchk_check_list (&portlist_tcp, "tcp", SH_PORT_REPORT);
1255 if (sh_portchk_check_udp == 1)
1256 sh_portchk_check_list (&portlist_udp, "udp", SH_PORT_REPORT);
1257 }
1258 return 0;
1259}
1260#endif
1261
1262#ifdef SH_CUTEST
1263#include "CuTest.h"
1264
1265void Test_portcheck_lists (CuTest *tc)
1266{
1267#if defined(SH_USE_PORTCHECK) && (defined(SH_WITH_CLIENT) || defined(SH_STANDALONE))
1268 struct in_addr haddr_local;
1269 struct sh_portentry * portent;
1270
1271 CuAssertTrue(tc, 0 != inet_aton("127.0.0.1", &haddr_local));
1272
1273 sh_portchk_add_to_list ("tcp", 8000, haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1274
1275 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, NULL);
1276 CuAssertPtrNotNull(tc, portent);
1277
1278 CuAssertTrue(tc, portent->port == 8000);
1279 CuAssertTrue(tc, 0 == strcmp("127.0.0.1", portent->interface));
1280 CuAssertTrue(tc, portent->status == SH_PORT_UNKN);
1281 CuAssertTrue(tc, portent->flag == SH_PORT_NOT);
1282
1283 sh_portchk_check_list (&portlist_tcp, "tcp", SH_PORT_NOREPT);
1284
1285 CuAssertTrue(tc, NULL == portlist_tcp);
1286
1287 sh_portchk_add_to_list ("tcp", 8000, haddr_local, NULL, SH_PORT_REQ, SH_PORT_UNKN);
1288 sh_portchk_add_to_list ("tcp", 8001, haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1289 sh_portchk_add_to_list ("tcp", 8002, haddr_local, NULL, SH_PORT_REQ, SH_PORT_UNKN);
1290 sh_portchk_add_to_list ("tcp", 8003, haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1291 sh_portchk_add_to_list ("tcp", 8004, haddr_local, NULL, SH_PORT_IGN, SH_PORT_UNKN);
1292 sh_portchk_add_to_list ("tcp", -1, haddr_local, "foo1", SH_PORT_NOT, SH_PORT_UNKN);
1293 sh_portchk_add_to_list ("tcp", -1, haddr_local, "foo2", SH_PORT_REQ, SH_PORT_UNKN);
1294 sh_portchk_add_to_list ("tcp", -1, haddr_local, "foo3", SH_PORT_NOT, SH_PORT_UNKN);
1295 sh_portchk_add_to_list ("tcp", -1, haddr_local, "foo4", SH_PORT_REQ, SH_PORT_UNKN);
1296 sh_portchk_add_to_list ("tcp", -1, haddr_local, "foo5", SH_PORT_IGN, SH_PORT_UNKN);
1297
1298 sh_portchk_check_list (&portlist_tcp, "tcp", SH_PORT_NOREPT);
1299
1300 CuAssertPtrNotNull(tc, portlist_tcp);
1301
1302 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, NULL);
1303 CuAssertPtrNotNull(tc, portent);
1304
1305 portent = sh_portchk_get_from_list("tcp", 8001, haddr_local, NULL);
1306 CuAssertTrue(tc, NULL == portent);
1307
1308 portent = sh_portchk_get_from_list("tcp", 8002, haddr_local, NULL);
1309 CuAssertPtrNotNull(tc, portent);
1310
1311 portent = sh_portchk_get_from_list("tcp", 8003, haddr_local, NULL);
1312 CuAssertTrue(tc, NULL == portent);
1313
1314 portent = sh_portchk_get_from_list("tcp", 8004, haddr_local, NULL);
1315 CuAssertPtrNotNull(tc, portent);
1316
1317 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, "foo1");
1318 CuAssertTrue(tc, NULL == portent);
1319
1320 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, "foo2");
1321 CuAssertPtrNotNull(tc, portent);
1322 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo2"));
1323
1324 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, "foo3");
1325 CuAssertTrue(tc, NULL == portent);
1326
1327 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, "foo4");
1328 CuAssertPtrNotNull(tc, portent);
1329 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo4"));
1330
1331 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, "foo5");
1332 CuAssertPtrNotNull(tc, portent);
1333 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo5"));
1334#else
1335 (void) tc; /* fix compiler warning */
1336#endif
1337 return;
1338}
1339#endif
1340
1341#ifdef TEST_ONLY
1342
1343void usage (char * pname)
1344{
1345 printf ("%s [-r|--required interface:portlist][-o|--optional interface:portlist][--no-udp][-d|--debug] hostname\n\n", pname);
1346 printf (" Check local host for open ports; Version %s\n\n", PORTCHK_VERSION);
1347 printf (" Interface: Numeric address for an interface, e.g. 127.0.0.1\n");
1348 printf (" Portlist: List of ports or services, e.g. 22/tcp,nfs/udp,nlockmgr/udp\n");
1349 printf (" required -> must be open\n");
1350 printf (" optional -> may be open or closed\n");
1351 printf (" RPC services must be specified with service **name**, others with **port number**\n\n");
1352 printf (" Example:\n");
1353 printf (" %s --required 192.168.1.2:22/tcp,nfs/udp,nlockmgr/udp\n\n", pname);
1354 return;
1355}
1356
1357int main(int argc, char *argv[])
1358{
1359 char * pname = argv[0];
1360
1361
1362 /*
1363 test_lists();
1364
1365 portlist_tcp = sh_portchk_kill_list (portlist_tcp);
1366 portlist_udp = sh_portchk_kill_list (portlist_udp);
1367 */
1368
1369 // sh_portchk_add_required ("127.0.0.1 : nlockmgr/tcp, 5308/tcp, nfs/tcp");
1370
1371 while (argc > 1 && argv[1][0] == '-')
1372 {
1373 if (0 == strcmp(argv[1], "--help") || 0 == strcmp(argv[1], "-h"))
1374 {
1375 usage(pname);
1376 exit (0);
1377 }
1378 else if (0 == strcmp(argv[1], "--required") || 0 == strcmp(argv[1], "-r"))
1379 {
1380 if (argc < 3)
1381 {
1382 usage(pname);
1383 exit (1);
1384 }
1385 sh_portchk_add_required (argv[2]);
1386 --argc; ++argv;
1387 }
1388 else if (0 == strcmp(argv[1], "--optional") || 0 == strcmp(argv[1], "-o"))
1389 {
1390 if (argc < 3)
1391 {
1392 usage(pname);
1393 exit (1);
1394 }
1395 sh_portchk_add_optional (argv[2]);
1396 --argc; ++argv;
1397 }
1398 else if (0 == strcmp(argv[1], "--no-udp"))
1399 {
1400 sh_portchk_check_udp = 0;
1401 }
1402 else if (0 == strcmp(argv[1], "--debug") || 0 == strcmp(argv[1], "-d"))
1403 {
1404 portchk_debug = 1;
1405 }
1406 else
1407 {
1408 usage(pname);
1409 exit (1);
1410 }
1411 --argc; ++argv;
1412 }
1413
1414 if (argc < 2)
1415 {
1416 usage(pname);
1417 exit (1);
1418 }
1419
1420 portchk_hostname = argv[1];
1421
1422 if (0 != sh_portchk_init ())
1423 {
1424 usage(pname);
1425 exit (1);
1426 }
1427
1428 sh_portchk_check();
1429
1430 /*
1431 sleep(10);
1432
1433 sh_portchk_check();
1434 */
1435
1436 return 0;
1437}
1438#endif
Note: See TracBrowser for help on using the repository browser.