source: trunk/src/sh_portcheck.c@ 76

Last change on this file since 76 was 76, checked in by rainer, 18 years ago

Fix for ticket #38 (csv escaping) and #39 (building on cygwin). Also optimize a bit.
  • Property svn:executable set to *
File size: 31.5 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
42#define PORTCHK_VERSION "1.0"
43
44#if defined(TEST_ONLY) || (defined(SH_USE_PORTCHECK) && (defined (SH_WITH_CLIENT) || defined (SH_STANDALONE)))
45
46
47#define PORTMAP
48#include <rpc/rpc.h>
49#ifdef HAVE_RPC_RPCENT_H
50#include <rpc/rpcent.h>
51#endif
52#include <rpc/pmap_clnt.h>
53#include <rpc/pmap_prot.h>
54#include <netdb.h>
55
56/*
57 * struct pmaplist {
58 * struct pmap pml_map;
59 * struct pmaplist *pml_next;
60 * };
61 */
62
63/* struct pmap {
64 * long unsigned pm_prog;
65 * long unsigned pm_vers;
66 * long unsigned pm_prot;
67 * long unsigned pm_port;
68 * };
69 */
70
71/* TIME_WAIT ? 60-240 seconds */
72
73/* the size of an interface string
74 */
75#define SH_INTERFACE_SIZE 16
76
77#define SH_PORT_NOT 0
78#define SH_PORT_REQ 1
79#define SH_PORT_OPT 2
80
81#define SH_PORT_MISS 0
82#define SH_PORT_ISOK 1
83#define SH_PORT_UNKN 2
84
85#define SH_PORT_NOREPT 0
86#define SH_PORT_REPORT 1
87
88struct sh_portentry {
89 int port;
90 char interface[SH_INTERFACE_SIZE];
91 char * service;
92 char * error;
93 int flag; /* required or not */
94 int status; /* missing or not */
95 struct sh_portentry * next;
96};
97
98static struct sh_portentry * portlist_tcp = NULL;
99static struct sh_portentry * portlist_udp = NULL;
100
101#define SH_PORTCHK_INTERVAL 300
102
103static int sh_portchk_check_udp = 1;
104static int sh_portchk_active = 1;
105static int sh_portchk_interval = SH_PORTCHK_INTERVAL;
106#if !defined(TEST_ONLY)
107
108#define FIL__ _("sh_portcheck.c")
109#include "samhain.h"
110#include "sh_error.h"
111#include "sh_mem.h"
112#include "sh_utils.h"
113#include "sh_modules.h"
114
115static int sh_portchk_severity = SH_ERR_SEVERE;
116#endif
117
118/* Exported interface to add required ports as 'iface:portlist'
119 */
120static int sh_portchk_add_required (const char * str);
121
122/* Exported interface to add optional ports as 'iface:portlist'
123 */
124static int sh_portchk_add_optional (const char * str);
125
126/* Exported interface to add an ethernet interface
127 */
128static int sh_portchk_add_interface (const char * str);
129
130
131#ifndef TEST_ONLY
132
133static int sh_portchk_set_interval (const char * c)
134{
135 int retval = 0;
136 long val;
137
138 SL_ENTER(_("sh_portchk_set_interval"));
139 val = strtol (c, (char **)NULL, 10);
140 if (val <= 0)
141 {
142 sh_error_handle ((-1), FIL__, __LINE__, EINVAL, MSG_EINVALS,
143 _("port check interval"), c);
144 retval = -1;
145 }
146
147 val = (val <= 0 ? 60 : val);
148
149 sh_portchk_interval = (time_t) val;
150 SL_RETURN(0, _("sh_portchk_set_interval"));
151}
152
153
154static int sh_portchk_set_active (const char * str)
155{
156 return sh_util_flagval(str, &sh_portchk_active);
157}
158
159static int sh_portchk_set_udp (const char * str)
160{
161 return sh_util_flagval(str, &sh_portchk_check_udp);
162}
163
164static int sh_portchk_set_severity (const char * str)
165{
166 char tmp[32];
167 tmp[0] = '='; tmp[1] = '\0';
168 sl_strlcat (tmp, str, 32);
169 return sh_error_set_level (tmp, &sh_portchk_severity);
170}
171
172sh_rconf sh_portchk_table[] = {
173 {
174 N_("severityportcheck"),
175 sh_portchk_set_severity,
176 },
177 {
178 N_("portcheckrequired"),
179 sh_portchk_add_required,
180 },
181 {
182 N_("portcheckoptional"),
183 sh_portchk_add_optional,
184 },
185 {
186 N_("portcheckactive"),
187 sh_portchk_set_active,
188 },
189 {
190 N_("portcheckinterface"),
191 sh_portchk_add_interface,
192 },
193 {
194 N_("portcheckinterval"),
195 sh_portchk_set_interval,
196 },
197 {
198 N_("portcheckudp"),
199 sh_portchk_set_udp,
200 },
201 {
202 NULL,
203 NULL
204 }
205};
206
207#endif
208
209/* Interface to initialize port check
210 */
211int sh_portchk_init ();
212
213/* Interface to reset port check
214 */
215int sh_portchk_reset ();
216
217/* Interface to run port check
218 */
219int sh_portchk_check ();
220
221
222static char * check_services (int port, char * proto);
223
224#ifdef TEST_ONLY
225
226static int portchk_debug = 0;
227#define SH_ALLOC malloc
228#define SH_FREE free
229#define sh_util_strdup strdup
230#define sl_strlcpy strncpy
231#define _(a) a
232
233#else
234
235static int portchk_debug = 0;
236
237#endif
238
239static void sh_portchk_add_to_list (char * proto,
240 int port, struct in_addr haddr, char * service,
241 int flag, int status)
242{
243 struct sh_portentry * new = SH_ALLOC (sizeof(struct sh_portentry));
244
245 if (portchk_debug)
246 fprintf(stderr, _("add to list: port %d/%s %d %d (%s)\n"),
247 port, proto, flag, status, service ? service : _("undef"));
248
249 new->port = port;
250 sl_strlcpy (new->interface, inet_ntoa(haddr), SH_INTERFACE_SIZE);
251 new->status = status;
252 new->flag = flag;
253
254 new->error = NULL;
255
256 if (service)
257 new->service = sh_util_strdup (service);
258 else
259 new->service = NULL;
260 if (0 == strcmp(proto, "tcp"))
261 {
262 new->next = portlist_tcp;
263 portlist_tcp = new;
264 }
265 else
266 {
267 new->next = portlist_udp;
268 portlist_udp = new;
269 }
270 return;
271}
272
273/* Reset the list by setting all entries to UNKN.
274 * In the next cycle we will check, and set found ports to ISOK.
275 * Thereafter, we check for entries that are still UNKN.
276 */
277static void sh_portchk_reset_lists ()
278{
279 struct sh_portentry * portlist;
280
281 portlist = portlist_tcp;
282 while (portlist)
283 {
284 if (portlist->status != SH_PORT_MISS)
285 portlist->status = SH_PORT_UNKN;
286 portlist = portlist->next;
287 }
288 portlist = portlist_udp;
289 while (portlist)
290 {
291 if (portlist->status != SH_PORT_MISS)
292 portlist->status = SH_PORT_UNKN;
293 portlist = portlist->next;
294 }
295 return;
296}
297
298static struct sh_portentry * sh_portchk_kill_list (struct sh_portentry * head)
299{
300 if (head)
301 {
302 if (head->next)
303 sh_portchk_kill_list (head->next);
304
305 if (head->service)
306 SH_FREE(head->service);
307 SH_FREE(head);
308 }
309 return NULL;
310}
311
312/* check the list of open ports for any that are marked as UNKN
313 */
314static void sh_portchk_check_list (struct sh_portentry ** head, char * proto, int report)
315{
316 struct sh_portentry * ptr = *head;
317 struct sh_portentry * pre = *head;
318 char errbuf[256];
319
320 while (ptr)
321 {
322 if (portchk_debug && report)
323 fprintf(stderr, _("check list: port %d/%s %d %d\n"),
324 ptr->port, proto, ptr->flag, ptr->status);
325
326 if (ptr->status == SH_PORT_UNKN)
327 {
328 /* Don't report missing ports that are marked as optional
329 */
330 if (ptr->flag != SH_PORT_OPT)
331 {
332 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServiceMissing] port %s:%d/%s (%s)"),
333 ptr->interface, ptr->port, proto,
334 ptr->service ? ptr->service : check_services(ptr->port, proto));
335#ifdef TEST_ONLY
336 if (report == SH_PORT_REPORT)
337 fprintf(stderr, _("%s\n"), errbuf);
338#else
339 if (report == SH_PORT_REPORT)
340 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
341 MSG_PORT_REPORT, errbuf);
342#endif
343 }
344
345 ptr->status = SH_PORT_MISS;
346
347 if ((ptr->flag != SH_PORT_REQ) && (ptr->flag != SH_PORT_OPT))
348 {
349 if (portchk_debug && report)
350 fprintf(stderr, _("removing: port %d/%s %d %d\n"),
351 ptr->port, proto, ptr->flag, ptr->status);
352
353 if (ptr == *head)
354 {
355 *head = ptr->next;
356 if (ptr->service)
357 SH_FREE(ptr->service);
358 SH_FREE(ptr);
359 ptr = *head;
360 pre = *head;
361 continue;
362 }
363 else if (ptr->next == NULL)
364 {
365 pre->next = NULL;
366 if (ptr->service)
367 SH_FREE(ptr->service);
368 SH_FREE(ptr);
369 return;
370 }
371 else
372 {
373 pre->next = ptr->next;
374 if (ptr->service)
375 SH_FREE(ptr->service);
376 SH_FREE(ptr);
377 ptr = pre->next;
378 continue;
379 }
380 }
381 }
382 pre = ptr;
383 ptr = ptr->next;
384 }
385 return;
386}
387
388
389static struct sh_portentry * sh_portchk_get_from_list (char * proto, int port,
390 struct in_addr haddr, char * service)
391{
392 struct sh_portentry * portlist;
393 char iface_all[8];
394
395 sl_strlcpy (iface_all, _("0.0.0.0"), sizeof(iface_all));
396
397 if (0 == strcmp(proto, "tcp"))
398 portlist = portlist_tcp;
399 else
400 portlist = portlist_udp;
401
402 if (service)
403 {
404 while (portlist)
405 {
406 if (portlist->service &&
407 0 == strcmp(service, portlist->service) &&
408 (0 == strcmp(portlist->interface, inet_ntoa(haddr)) ||
409 0 == strcmp(portlist->interface, iface_all)))
410 return portlist;
411 portlist = portlist->next;
412 }
413 }
414 else
415 {
416 while (portlist)
417 {
418 if (port == portlist->port &&
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 return NULL;
426}
427
428
429static void sh_portchk_cmp_to_list (char * proto, int port, struct in_addr haddr, char * service)
430{
431 struct sh_portentry * portent;
432 char errbuf[256];
433
434
435 portent = sh_portchk_get_from_list (proto, port, haddr, service);
436
437 if (service)
438 {
439 if (!portent)
440 {
441 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServiceNew] port %s:%d/%s (%s)"),
442 inet_ntoa(haddr), port, proto, service);
443#ifdef TEST_ONLY
444 fprintf(stderr, _("open port: %s:%d/%s (%s)\n"),
445 inet_ntoa(haddr), port, proto, service);
446#else
447 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
448 MSG_PORT_REPORT, errbuf);
449#endif
450 /*
451 * was not there, thus it is not in 'required' or 'optional' list
452 */
453 sh_portchk_add_to_list (proto, port, haddr, service, SH_PORT_NOT, SH_PORT_ISOK);
454 }
455 else if (portent->status == SH_PORT_MISS)
456 {
457 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServiceRestarted] port %s:%d/%s to %d/%s (%s)"),
458 inet_ntoa(haddr), portent->port, proto, port, proto, service);
459#ifdef TEST_ONLY
460 fprintf(stderr, _("service: %s\n"), errbuf);
461#else
462 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
463 MSG_PORT_REPORT, errbuf);
464#endif
465
466 portent->status = SH_PORT_ISOK;
467 }
468 else if (port != portent->port && (-1) != portent->port)
469 {
470 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServicePortSwitch] port %s:%d/%s to %d/%s (%s)"),
471 inet_ntoa(haddr), portent->port, proto, port, proto, service);
472#ifdef TEST_ONLY
473 fprintf(stderr, _("service: %s\n"), errbuf);
474#else
475 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
476 MSG_PORT_REPORT, errbuf);
477#endif
478
479 portent->status = SH_PORT_ISOK;
480 }
481 else
482 {
483 portent->status = SH_PORT_ISOK;
484 }
485 }
486 else
487 {
488 if (!portent)
489 {
490 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServiceNew] port %s:%d/%s (%s)"),
491 inet_ntoa(haddr), port, proto, check_services(port, proto));
492#ifdef TEST_ONLY
493 fprintf(stderr, _("open port: %s:%d/%s (%s)\n"),
494 inet_ntoa(haddr), port, proto, check_services(port, proto));
495#else
496 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
497 MSG_PORT_REPORT, errbuf);
498#endif
499
500 /* was not there, thus it is not in 'required' or 'optional' list
501 */
502 sh_portchk_add_to_list (proto, port, haddr, service, SH_PORT_NOT, SH_PORT_ISOK);
503 }
504 else if (portent->status == SH_PORT_MISS)
505 {
506 snprintf (errbuf, sizeof(errbuf), _("POLICY [ServiceRestarted] port %s:%d/%s (%s)"),
507 inet_ntoa(haddr), port, proto, check_services(port, proto));
508#ifdef TEST_ONLY
509 fprintf(stderr, _("port : %s\n"), errbuf);
510#else
511 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
512 MSG_PORT_REPORT, errbuf);
513#endif
514
515 portent->status = SH_PORT_ISOK;
516 }
517 else
518 {
519 portent->status = SH_PORT_ISOK;
520 }
521 }
522
523 return;
524}
525
526
527/* Returns a static buffer containing the name of the service
528 * running on port <port> (from /etc/services)
529 * Returns NULL on failure
530 */
531static char * check_services (int port, char * proto)
532{
533 static char buf[256];
534 struct servent * service = getservbyport(htons(port), proto);
535
536 if (service && service->s_name && service->s_name[0] != '\0')
537 {
538 snprintf (buf, sizeof(buf), _("maybe_%s"), service->s_name);
539 }
540 else
541 {
542 snprintf (buf, sizeof(buf), _("unknown"));
543 }
544 return buf;
545}
546
547/* Returns a static buffer containing the name of the service
548 * running on port <port> at <address> (from portmap daemon)
549 * Returns NULL on failure
550 */
551static char * check_rpc_list (int port, struct sockaddr_in * address,
552 unsigned long prot)
553{
554 struct pmaplist * head;
555 struct rpcent *r;
556 static char buf[256];
557
558 head = pmap_getmaps(address);
559
560 if (head)
561 {
562 do /* while (head != NULL) */
563 {
564 if ((head->pml_map.pm_prot == prot) &&
565 (port == (int)head->pml_map.pm_port))
566 {
567 r = getrpcbynumber((int)head->pml_map.pm_prog);
568 if (r && r->r_name && r->r_name[0] != '\0')
569 {
570 snprintf (buf, sizeof(buf), "%s", r->r_name);
571 return buf;
572 }
573 else
574 {
575 snprintf (buf, sizeof(buf), "RPC_%lu",
576 (unsigned long)head->pml_map.pm_prog);
577 return buf;
578 }
579 }
580 head = head->pml_next;
581 }
582 while (head != NULL);
583 }
584
585 return NULL;
586}
587
588static int check_port_udp_internal (int fd, int port, struct in_addr haddr)
589{
590 struct sockaddr_in sinr;
591 /* struct in_addr haddr; */
592 int retval;
593 char * p;
594 char buf[8];
595
596
597 /* inet_aton(interface, &haddr); */
598
599 sinr.sin_family = AF_INET;
600 sinr.sin_port = htons (port);
601 sinr.sin_addr = haddr;
602
603 retval = connect(fd, (struct sockaddr *) &sinr, sizeof(sinr));
604 if (retval == -1)
605 {
606#ifdef TEST_ONLY
607 if (portchk_debug)
608 perror(_("connect"));
609#else
610 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
611 sh_error_message(errno), _("connect"));
612#endif
613 }
614 else
615 {
616 retval = send (fd, buf, 0, 0);
617
618 if (retval == -1 && errno == ECONNREFUSED)
619 {
620 if (portchk_debug)
621 fprintf(stderr, _("check port: %5d/udp on %15s established/time_wait\n"),
622 port, inet_ntoa(haddr));
623 }
624 else
625 {
626 retval = send (fd, buf, 0, 0);
627 if (retval == -1 && errno == ECONNREFUSED)
628 {
629 if (portchk_debug)
630 fprintf(stderr, _("check port: %5d/udp on %15s established/time_wait\n"),
631 port, inet_ntoa(haddr));
632 }
633 else if (retval != -1)
634 {
635 /* Try to get service name from portmap
636 */
637 p = check_rpc_list (port, &sinr, IPPROTO_UDP);
638
639 sh_portchk_cmp_to_list ("udp", port, haddr, p ? p : NULL);
640
641 /* If not an RPC service, try to get name from /etc/services
642 */
643 if (!p)
644 p = check_services(port, "udp");
645
646 if (portchk_debug)
647 fprintf(stderr, _("check port: %5d/udp on %15s open %s\n"),
648 port, inet_ntoa(haddr), p);
649
650 }
651 }
652 }
653 close (fd);
654 return 0;
655}
656
657static int check_port_tcp_internal (int fd, int port, struct in_addr haddr)
658{
659 struct sockaddr_in sinr;
660 /* struct in_addr haddr; */
661 int retval;
662 char * p;
663
664
665 /* inet_aton(interface, &haddr); */
666
667 sinr.sin_family = AF_INET;
668 sinr.sin_port = htons (port);
669 sinr.sin_addr = haddr;
670
671 retval = connect(fd, (struct sockaddr *) &sinr, sizeof(sinr));
672 if (retval == -1 && errno == ECONNREFUSED)
673 {
674 if (portchk_debug)
675 fprintf(stderr, _("check port: %5d on %15s established/time_wait\n"),
676 port, inet_ntoa(haddr));
677 }
678 else if (retval == -1)
679 {
680#ifdef TEST_ONLY
681 if (portchk_debug)
682 perror(_("connect"));
683#else
684 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
685 sh_error_message(errno), _("connect"));
686#endif
687 }
688 else
689 {
690 /* Try to get service name from portmap
691 */
692 p = check_rpc_list (port, &sinr, IPPROTO_TCP);
693
694 sh_portchk_cmp_to_list ("tcp", port, haddr, p ? p : NULL);
695
696 /* If not an RPC service, try to get name from /etc/services
697 */
698 if (!p)
699 p = check_services(port, "tcp");
700
701 if (portchk_debug)
702 fprintf(stderr, _("check port: %5d on %15s open %s\n"),
703 port, inet_ntoa(haddr), p);
704 }
705 close (fd);
706 return 0;
707}
708
709/* typedef uint32_t in_addr_t;
710 * struct in_addr
711 * {
712 * in_addr_t s_addr;
713 * };
714 */
715
716#define SH_IFACE_MAX 16
717
718struct portchk_interfaces {
719 struct in_addr iface[SH_IFACE_MAX];
720 int used;
721};
722
723static struct portchk_interfaces iface_list;
724static int iface_initialized = 0;
725
726#ifdef TEST_ONLY
727static char * portchk_hostname = NULL;
728#else
729static char * portchk_hostname = sh.host.name;
730#endif
731
732int sh_portchk_init ()
733{
734 struct hostent * hent;
735 int i = 0;
736 char errbuf[256];
737
738 if (portchk_debug)
739 fprintf(stderr, _("checking ports on: %s\n"), portchk_hostname ? portchk_hostname : _("NULL"));
740 if (!portchk_hostname)
741 return -1;
742
743 if (iface_initialized == 0)
744 {
745 iface_list.used = 0;
746 iface_initialized = 1;
747 }
748
749 hent = gethostbyname(portchk_hostname);
750
751 while (hent && hent->h_addr_list[i] && (iface_list.used < SH_IFACE_MAX))
752 {
753 memcpy (&(iface_list.iface[iface_list.used].s_addr), hent->h_addr_list[i], sizeof(in_addr_t));
754 sl_snprintf(errbuf, sizeof(errbuf), _("interface: %s"),
755 inet_ntoa(iface_list.iface[iface_list.used]));
756 sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
757 errbuf, _("sh_portchk_init"));
758
759 ++iface_list.used;
760 ++i;
761 }
762
763 return 0;
764}
765
766#if !defined(TEST_ONLY)
767int sh_portchk_reconf ()
768{
769 iface_initialized = 0;
770
771 portlist_udp = sh_portchk_kill_list (portlist_udp);
772 portlist_tcp = sh_portchk_kill_list (portlist_tcp);
773 return 0;
774}
775
776int sh_portchk_cleanup ()
777{
778 return sh_portchk_reconf ();
779}
780
781int sh_portchk_timer (time_t tcurrent)
782{
783 static time_t lastcheck = 0;
784
785 SL_ENTER(_("sh_portchk_timer"));
786 if ((time_t) (tcurrent - lastcheck) >= sh_portchk_interval)
787 {
788 lastcheck = tcurrent;
789 SL_RETURN((-1), _("sh_portchk_timer"));
790 }
791 SL_RETURN(0, _("sh_portchk_timer"));
792}
793#endif
794
795static int check_port_generic (int port, int type, int protocol)
796{
797 int i = 0;
798 int sock = -1;
799 int flag = 1; /* non-zero to enable an option */
800 struct in_addr haddr;
801
802 /* Check all interfaces for this host
803 */
804 while (i < iface_list.used)
805 {
806 if ((sock = socket(AF_INET, type, protocol)) < 0 )
807 {
808#ifdef TEST_ONLY
809 if (portchk_debug)
810 perror(_("socket"));
811#else
812 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
813 sh_error_message(errno), _("socket"));
814#endif
815 }
816 if ( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
817 (void *) &flag, sizeof(flag)) < 0 )
818 {
819#ifdef TEST_ONLY
820 if (portchk_debug)
821 perror(_("setsockopt"));
822#else
823 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
824 sh_error_message(errno), _("setsockopt"));
825#endif
826 }
827
828 memcpy (&(haddr.s_addr), &(iface_list.iface[i].s_addr), sizeof(in_addr_t));
829
830 if (protocol == IPPROTO_TCP)
831 check_port_tcp_internal(sock, port, haddr);
832 else
833 check_port_udp_internal(sock, port, haddr);
834
835 ++i;
836 }
837
838 return 0;
839}
840
841
842
843static int check_port_udp (int port)
844{
845 return check_port_generic(port, SOCK_DGRAM, IPPROTO_UDP);
846}
847
848static int check_port_tcp (int port)
849{
850 return check_port_generic(port, SOCK_STREAM, IPPROTO_TCP);
851}
852
853
854
855static int sh_portchk_scan_ports_generic (int min_port, int max_port, int type, int protocol)
856{
857 /*
858 int min_port = 1024;
859 int max_port = 65535;
860 */
861
862 int port;
863 int retval;
864 int sock = -1;
865 int flag = 1; /* non-zero to enable an option */
866
867 struct sockaddr_in addr;
868 int addrlen = sizeof(addr);
869
870 if (min_port == -1)
871 min_port = 0;
872 if (max_port == -1)
873 max_port = 65535;
874
875 for (port = min_port; port <= max_port; ++port)
876 {
877
878 if ((sock = socket(AF_INET, type, protocol)) < 0 )
879 {
880#ifdef TEST_ONLY
881 if (portchk_debug)
882 perror(_("socket"));
883#else
884 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
885 sh_error_message(errno), _("socket"));
886#endif
887 }
888 if ( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
889 (void *) &flag, sizeof(flag)) < 0 )
890 {
891#ifdef TEST_ONLY
892 if (portchk_debug)
893 perror(_("setsockopt"));
894#else
895 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
896 sh_error_message(errno), _("setsockopt"));
897#endif
898 }
899
900 addr.sin_family = AF_INET;
901 addr.sin_port = htons(port);
902 addr.sin_addr.s_addr = INADDR_ANY;
903
904 retval = bind (sock, (struct sockaddr *) &addr, addrlen);
905
906 if (retval == 0)
907 {
908 /* we can bind the port, thus it is unused
909 */
910 close (sock);
911 }
912 else
913 {
914 if (errno == EINVAL || errno == EADDRINUSE)
915 {
916 /* try to connect to the port
917 */
918 if (protocol == IPPROTO_TCP)
919 check_port_tcp(port);
920 else
921 check_port_udp(port);
922 }
923 else
924 {
925#ifdef TEST_ONLY
926 if (portchk_debug)
927 perror(_("bind"));
928#else
929 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
930 sh_error_message(errno), _("bind"));
931#endif
932 }
933 close (sock);
934 }
935 }
936 return 0;
937}
938
939static int sh_portchk_scan_ports_tcp (int min_port, int max_port)
940{
941 return sh_portchk_scan_ports_generic (min_port, max_port, SOCK_STREAM, IPPROTO_TCP);
942}
943
944static int sh_portchk_scan_ports_udp (int min_port, int max_port)
945{
946 return sh_portchk_scan_ports_generic (min_port, max_port, SOCK_DGRAM, IPPROTO_UDP);
947}
948
949/* Subroutine to add an interface
950 */
951static int sh_portchk_add_interface (const char * str)
952{
953 struct in_addr haddr;
954 char errbuf[256];
955
956 if (iface_initialized == 0)
957 {
958 iface_list.used = 0;
959 iface_initialized = 1;
960 }
961
962 if (0 == inet_aton(str, &haddr))
963 return -1;
964
965 if (iface_list.used == SH_IFACE_MAX)
966 return -1;
967
968 sl_snprintf(errbuf, sizeof(errbuf), _("interface: %s"), inet_ntoa(haddr));
969 sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
970 errbuf, _("sh_portchk_add_interface"));
971
972 memcpy (&(iface_list.iface[iface_list.used].s_addr), &(haddr.s_addr), sizeof(in_addr_t));
973 ++iface_list.used;
974
975 return 0;
976}
977
978
979/* Subroutine to add a required or optional port/service
980 */
981static int sh_portchk_add_required_port_generic (char * service, char * interface, int type)
982{
983 char buf[256];
984 char proto[4];
985 char * p;
986 char * endptr;
987 unsigned long int port;
988 struct in_addr haddr;
989 struct sh_portentry * portent;
990
991 if (0 == inet_aton(interface, &haddr))
992 return -1;
993
994 sl_strlcpy (buf, service, sizeof(buf));
995
996 p = strchr(buf, '/');
997 if (!p)
998 return -1;
999 if (0 == strcmp(p, _("/tcp")))
1000 sl_strlcpy(proto, _("tcp"), sizeof(proto));
1001 else if (0 == strcmp(p, _("/udp")))
1002 sl_strlcpy(proto, _("udp"), sizeof(proto));
1003 else
1004 return -1;
1005
1006 *p = '\0';
1007 port = strtoul(buf, &endptr, 0);
1008
1009 if (*endptr != '\0')
1010 {
1011 portent = sh_portchk_get_from_list (proto, -1, haddr, buf);
1012 if (!portent)
1013 sh_portchk_add_to_list (proto, -1, haddr, buf, type, SH_PORT_UNKN);
1014 else
1015 {
1016#ifdef TEST_ONLY
1017 fprintf(stderr, "** WARNING: duplicate port definition %s/%s\n", buf, proto);
1018#else
1019 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1020 _("duplicate port definition"), _("sh_portchk_add_required_port_generic"));
1021#endif
1022 return -1;
1023 }
1024 }
1025 else if (port <= 65535)
1026 {
1027 portent = sh_portchk_get_from_list (proto, port, haddr, NULL);
1028 if (!portent)
1029 sh_portchk_add_to_list (proto, port, haddr, NULL, type, SH_PORT_UNKN);
1030 else
1031 {
1032#ifdef TEST_ONLY
1033 fprintf(stderr, "** WARNING: duplicate port definition %lu/%s\n", port, proto);
1034#else
1035 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1036 _("duplicate port definition"), _("sh_portchk_add_required_port_generic"));
1037#endif
1038 return -1;
1039 }
1040 }
1041 else
1042 return -1;
1043
1044 return 0;
1045}
1046
1047/* Internal interface to add required or optional ports as 'iface:portlist'
1048 */
1049static int sh_portchk_add_required_generic (const char * str, int type)
1050{
1051 size_t len;
1052 size_t ll = 0;
1053
1054 char * interface = NULL;
1055 char * list;
1056 char * p;
1057
1058 if (!str)
1059 return -1;
1060
1061 if (strchr(str, ':'))
1062 {
1063 len = strlen(str);
1064 for (ll = 0; ll < len; ++ll)
1065 {
1066 if (str[ll] == ':' || str[ll] == ' ' || str[ll] == '\t')
1067 {
1068 interface = SH_ALLOC(ll+1);
1069 sl_strlcpy(interface, str, ll+1);
1070 interface[ll] = '\0';
1071 while (str[ll] == ':' || str[ll] == ' ' || str[ll] == '\t')
1072 ++ll;
1073 break;
1074 }
1075 }
1076 }
1077 else
1078 {
1079 interface = SH_ALLOC(8);
1080 sl_strlcpy(interface, _("0.0.0.0"), 8);
1081 interface[7] = '\0';
1082 while (str[ll] == ' ' || str[ll] == '\t')
1083 ++ll;
1084 }
1085
1086 if (!interface)
1087 return -1;
1088
1089 if (str[ll] == '\0')
1090 {
1091 SH_FREE(interface);
1092 return -1;
1093 }
1094
1095 if (portchk_debug)
1096 fprintf(stderr, "add ports for interface: %s\n", interface);
1097
1098 list = sh_util_strdup(&str[ll]);
1099 p = strtok (list, " ,\t");
1100 if (!p)
1101 {
1102 SH_FREE(interface);
1103 SH_FREE(list);
1104 return -1;
1105 }
1106 while (p)
1107 {
1108 if (-1 == sh_portchk_add_required_port_generic (p, interface, type))
1109 {
1110 SH_FREE(interface);
1111 SH_FREE(list);
1112 return -1;
1113 }
1114 p = strtok (NULL, " ,\t");
1115 }
1116 SH_FREE(interface);
1117 SH_FREE(list);
1118 return 0;
1119}
1120
1121/* User interface to add required ports as 'iface:portlist'
1122 */
1123static int sh_portchk_add_required (const char * str)
1124{
1125 return sh_portchk_add_required_generic (str, SH_PORT_REQ);
1126}
1127
1128/* User interface to add optional ports as 'iface:portlist'
1129 */
1130static int sh_portchk_add_optional (const char * str)
1131{
1132 return sh_portchk_add_required_generic (str, SH_PORT_OPT);
1133}
1134
1135/* Interface to run port check
1136 */
1137int sh_portchk_check ()
1138{
1139 int min_port = 0;
1140
1141 sh_portchk_reset_lists();
1142 if (0 != geteuid())
1143 {
1144 min_port = 1024;
1145#ifdef TEST_ONLY
1146 fprintf(stderr, "** WARNING not scanning ports < 1024\n");
1147#else
1148 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1149 _("not scanning ports below 1024"), _("sh_portchk_check"));
1150#endif
1151 }
1152 if (sh_portchk_check_udp == 1)
1153 sh_portchk_scan_ports_udp(min_port, -1);
1154 sh_portchk_scan_ports_tcp(min_port, -1);
1155 sh_portchk_check_list (&portlist_tcp, "tcp", SH_PORT_REPORT);
1156 if (sh_portchk_check_udp == 1)
1157 sh_portchk_check_list (&portlist_udp, "udp", SH_PORT_REPORT);
1158 return 0;
1159}
1160#endif
1161
1162#ifdef SH_CUTEST
1163#include "CuTest.h"
1164
1165void Test_portcheck_lists (CuTest *tc)
1166{
1167#if defined(SH_USE_PORTCHECK) && (defined(SH_WITH_CLIENT) || defined(SH_STANDALONE))
1168 struct in_addr haddr_local;
1169 struct sh_portentry * portent;
1170
1171 CuAssertTrue(tc, 0 != inet_aton("127.0.0.1", &haddr_local));
1172
1173 sh_portchk_add_to_list ("tcp", 8000, haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1174
1175 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, NULL);
1176 CuAssertPtrNotNull(tc, portent);
1177
1178 CuAssertTrue(tc, portent->port == 8000);
1179 CuAssertTrue(tc, 0 == strcmp("127.0.0.1", portent->interface));
1180 CuAssertTrue(tc, portent->status == SH_PORT_UNKN);
1181 CuAssertTrue(tc, portent->flag == SH_PORT_NOT);
1182
1183 sh_portchk_check_list (&portlist_tcp, "tcp", SH_PORT_NOREPT);
1184
1185 CuAssertTrue(tc, NULL == portlist_tcp);
1186
1187 sh_portchk_add_to_list ("tcp", 8000, haddr_local, NULL, SH_PORT_REQ, SH_PORT_UNKN);
1188 sh_portchk_add_to_list ("tcp", 8001, haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1189 sh_portchk_add_to_list ("tcp", 8002, haddr_local, NULL, SH_PORT_REQ, SH_PORT_UNKN);
1190 sh_portchk_add_to_list ("tcp", 8003, haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1191 sh_portchk_add_to_list ("tcp", -1, haddr_local, "foo1", SH_PORT_NOT, SH_PORT_UNKN);
1192 sh_portchk_add_to_list ("tcp", -1, haddr_local, "foo2", SH_PORT_REQ, SH_PORT_UNKN);
1193 sh_portchk_add_to_list ("tcp", -1, haddr_local, "foo3", SH_PORT_NOT, SH_PORT_UNKN);
1194 sh_portchk_add_to_list ("tcp", -1, haddr_local, "foo4", SH_PORT_REQ, SH_PORT_UNKN);
1195
1196 sh_portchk_check_list (&portlist_tcp, "tcp", SH_PORT_NOREPT);
1197
1198 CuAssertPtrNotNull(tc, portlist_tcp);
1199
1200 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, NULL);
1201 CuAssertPtrNotNull(tc, portent);
1202
1203 portent = sh_portchk_get_from_list("tcp", 8001, haddr_local, NULL);
1204 CuAssertTrue(tc, NULL == portent);
1205
1206 portent = sh_portchk_get_from_list("tcp", 8002, haddr_local, NULL);
1207 CuAssertPtrNotNull(tc, portent);
1208
1209 portent = sh_portchk_get_from_list("tcp", 8003, haddr_local, NULL);
1210 CuAssertTrue(tc, NULL == portent);
1211
1212 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, "foo1");
1213 CuAssertTrue(tc, NULL == portent);
1214
1215 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, "foo2");
1216 CuAssertPtrNotNull(tc, portent);
1217 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo2"));
1218
1219 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, "foo3");
1220 CuAssertTrue(tc, NULL == portent);
1221
1222 portent = sh_portchk_get_from_list("tcp", 8000, haddr_local, "foo4");
1223 CuAssertPtrNotNull(tc, portent);
1224 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo4"));
1225#else
1226 (void) tc; /* fix compiler warning */
1227#endif
1228 return;
1229}
1230#endif
1231
1232#ifdef TEST_ONLY
1233
1234void usage (char * pname)
1235{
1236 printf ("%s [-r|--required interface:portlist][-o|--optional interface:portlist][--no-udp][-d|--debug] hostname\n\n", pname);
1237 printf (" Check local host for open ports; Version %s\n\n", PORTCHK_VERSION);
1238 printf (" Interface: Numeric address for an interface, e.g. 127.0.0.1\n");
1239 printf (" Portlist: List of ports or services, e.g. 22/tcp,nfs/udp,nlockmgr/udp\n");
1240 printf (" required -> must be open\n");
1241 printf (" optional -> may be open or closed\n");
1242 printf (" RPC services must be specified with service **name**, others with **port number**\n\n");
1243 printf (" Example:\n");
1244 printf (" %s --required 192.168.1.2:22/tcp,nfs/udp,nlockmgr/udp\n\n", pname);
1245 return;
1246}
1247
1248int main(int argc, char *argv[])
1249{
1250 char * pname = argv[0];
1251
1252
1253 /*
1254 test_lists();
1255
1256 portlist_tcp = sh_portchk_kill_list (portlist_tcp);
1257 portlist_udp = sh_portchk_kill_list (portlist_udp);
1258 */
1259
1260 // sh_portchk_add_required ("127.0.0.1 : nlockmgr/tcp, 5308/tcp, nfs/tcp");
1261
1262 while (argc > 1 && argv[1][0] == '-')
1263 {
1264 if (0 == strcmp(argv[1], "--help") || 0 == strcmp(argv[1], "-h"))
1265 {
1266 usage(pname);
1267 exit (0);
1268 }
1269 else if (0 == strcmp(argv[1], "--required") || 0 == strcmp(argv[1], "-r"))
1270 {
1271 if (argc < 3)
1272 {
1273 usage(pname);
1274 exit (1);
1275 }
1276 sh_portchk_add_required (argv[2]);
1277 --argc; ++argv;
1278 }
1279 else if (0 == strcmp(argv[1], "--optional") || 0 == strcmp(argv[1], "-o"))
1280 {
1281 if (argc < 3)
1282 {
1283 usage(pname);
1284 exit (1);
1285 }
1286 sh_portchk_add_optional (argv[2]);
1287 --argc; ++argv;
1288 }
1289 else if (0 == strcmp(argv[1], "--no-udp"))
1290 {
1291 sh_portchk_check_udp = 0;
1292 }
1293 else if (0 == strcmp(argv[1], "--debug") || 0 == strcmp(argv[1], "-d"))
1294 {
1295 portchk_debug = 1;
1296 }
1297 else
1298 {
1299 usage(pname);
1300 exit (1);
1301 }
1302 --argc; ++argv;
1303 }
1304
1305 if (argc < 2)
1306 {
1307 usage(pname);
1308 exit (1);
1309 }
1310
1311 portchk_hostname = argv[1];
1312
1313 if (0 != sh_portchk_init ())
1314 {
1315 usage(pname);
1316 exit (1);
1317 }
1318
1319 sh_portchk_check();
1320
1321 /*
1322 sleep(10);
1323
1324 sh_portchk_check();
1325 */
1326
1327 return 0;
1328}
1329#endif
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