source: trunk/src/sh_portcheck.c@ 328

Last change on this file since 328 was 328, checked in by katerina, 14 years ago

Fix for ticket #247: The port range for the open port check should be configurable
  • Property svn:executable set to *
File size: 51.2 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#ifdef HAVE_RPC_RPC_H
50#include <rpc/rpc.h>
51#ifdef HAVE_RPC_RPCENT_H
52#include <rpc/rpcent.h>
53#endif
54#include <rpc/pmap_clnt.h>
55#include <rpc/pmap_prot.h>
56#endif
57#include <netdb.h>
58
59/*
60 * struct pmaplist {
61 * struct pmap pml_map;
62 * struct pmaplist *pml_next;
63 * };
64 */
65
66/* struct pmap {
67 * long unsigned pm_prog;
68 * long unsigned pm_vers;
69 * long unsigned pm_prot;
70 * long unsigned pm_port;
71 * };
72 */
73
74/* TIME_WAIT ? 60-240 seconds */
75
76#if !defined(TEST_ONLY)
77
78#define FIL__ _("sh_portcheck.c")
79#include "samhain.h"
80#include "sh_error.h"
81#include "sh_mem.h"
82#include "sh_calls.h"
83#include "sh_utils.h"
84#include "sh_modules.h"
85#define SH_NEED_GETHOSTBYXXX
86#include "sh_static.h"
87#include "sh_pthread.h"
88#include "sh_ipvx.h"
89
90/* the size of an interface string
91 */
92#define SH_INTERFACE_SIZE SH_IP_BUF
93
94#define SH_PORT_NOT 0
95#define SH_PORT_REQ 1
96#define SH_PORT_OPT 2
97#define SH_PORT_IGN 3
98#define SH_PORT_BLACKLIST 4
99
100#define SH_PORT_MISS 0
101#define SH_PORT_ISOK 1
102#define SH_PORT_UNKN 2
103
104#define SH_PORT_NOREPT 0
105#define SH_PORT_REPORT 1
106
107#define SH_PROTO_TCP 0
108#define SH_PROTO_UDP 1
109#define SH_PROTO_STR(a) (((a) == IPPROTO_TCP) ? _("tcp") : _("udp"))
110
111struct sh_portentry {
112 int port;
113 char interface[SH_INTERFACE_SIZE];
114 char * service;
115 char * error;
116 int flag; /* required or not */
117 int status; /* missing or not */
118 struct sh_portentry * next;
119};
120
121static struct sh_portentry * portlist_tcp = NULL;
122static struct sh_portentry * portlist_udp = NULL;
123
124
125#define SH_PORTCHK_INTERVAL 300
126
127static int sh_portchk_check_udp = 1;
128static int sh_portchk_active = 1;
129static int sh_portchk_interval = SH_PORTCHK_INTERVAL;
130
131static int sh_portchk_minport = -1;
132static int sh_portchk_maxport = -1;
133
134struct sh_port {
135 int port;
136 struct sh_sockaddr * paddr;
137 struct sh_port * next;
138};
139
140static struct sh_port * blacklist_tcp = NULL;
141static struct sh_port * blacklist_udp = NULL;
142
143SH_MUTEX_STATIC(mutex_port_check, PTHREAD_MUTEX_INITIALIZER);
144
145static int sh_portchk_severity = SH_ERR_SEVERE;
146
147extern char * sh_port2proc_query(int proto, struct sh_sockaddr * saddr, int sport,
148 unsigned long * pid, char * user, size_t userlen);
149extern int sh_port2proc_prepare();
150extern void sh_port2proc_finish();
151
152#endif
153
154/* Exported interface to add ignoreable ports as 'iface:portlist'
155 */
156static int sh_portchk_add_ignore (const char * str);
157
158/* Exported interface to add required ports as 'iface:portlist'
159 */
160static int sh_portchk_add_required (const char * str);
161
162/* Exported interface to add optional ports as 'iface:portlist'
163 */
164static int sh_portchk_add_optional (const char * str);
165
166/* Exported interface to add blacklisted ports as 'iface:portlist'
167 */
168static int sh_portchk_add_blacklist (const char * str);
169
170/* Exported interface to add an ethernet interface
171 */
172static int sh_portchk_add_interface (const char * str);
173
174/* verify whether port/interface is blacklisted (do not check)
175 */
176static int sh_portchk_is_blacklisted(int port, struct sh_sockaddr * haddr, int proto);
177
178#ifndef TEST_ONLY
179
180static int sh_portchk_set_interval (const char * c)
181{
182 int retval = 0;
183 long val;
184
185 SL_ENTER(_("sh_portchk_set_interval"));
186 val = strtol (c, (char **)NULL, 10);
187 if (val <= 0)
188 {
189 SH_MUTEX_LOCK(mutex_thread_nolog);
190 sh_error_handle ((-1), FIL__, __LINE__, EINVAL, MSG_EINVALS,
191 _("port check interval"), c);
192 SH_MUTEX_UNLOCK(mutex_thread_nolog);
193 retval = -1;
194 }
195
196 sh_portchk_interval = (time_t) val;
197 SL_RETURN(0, _("sh_portchk_set_interval"));
198}
199
200static int sh_portchk_set_port_minmax (const char * c, int * setthis)
201{
202 int retval = 0;
203 long val;
204
205 SL_ENTER(_("sh_portchk_set_port_minmax"));
206 val = strtol (c, (char **)NULL, 10);
207 if (val < 0 || val > 65535)
208 {
209 SH_MUTEX_LOCK(mutex_thread_nolog);
210 sh_error_handle ((-1), FIL__, __LINE__, EINVAL, MSG_EINVALS,
211 _("port check port minmax"), c);
212 SH_MUTEX_UNLOCK(mutex_thread_nolog);
213 retval = -1;
214 }
215
216 *setthis = (int) val;
217 SL_RETURN(0, _("sh_portchk_set_port_minmax"));
218}
219
220
221static int sh_portchk_set_minport (const char * str)
222{
223 return sh_portchk_set_port_minmax (str, &sh_portchk_minport);
224}
225
226static int sh_portchk_set_maxport (const char * str)
227{
228 return sh_portchk_set_port_minmax (str, &sh_portchk_maxport);
229}
230
231static int sh_portchk_set_active (const char * str)
232{
233 return sh_util_flagval(str, &sh_portchk_active);
234}
235
236static int sh_portchk_set_udp (const char * str)
237{
238 return sh_util_flagval(str, &sh_portchk_check_udp);
239}
240
241static int sh_portchk_set_severity (const char * str)
242{
243 char tmp[32];
244 tmp[0] = '='; tmp[1] = '\0';
245 sl_strlcat (tmp, str, 32);
246 return sh_error_set_level (tmp, &sh_portchk_severity);
247}
248
249sh_rconf sh_portchk_table[] = {
250 {
251 N_("severityportcheck"),
252 sh_portchk_set_severity,
253 },
254 {
255 N_("portcheckrequired"),
256 sh_portchk_add_required,
257 },
258 {
259 N_("portcheckoptional"),
260 sh_portchk_add_optional,
261 },
262 {
263 N_("portcheckignore"),
264 sh_portchk_add_ignore,
265 },
266 {
267 N_("portcheckskip"),
268 sh_portchk_add_blacklist,
269 },
270 {
271 N_("portcheckactive"),
272 sh_portchk_set_active,
273 },
274 {
275 N_("portcheckinterface"),
276 sh_portchk_add_interface,
277 },
278 {
279 N_("portcheckinterval"),
280 sh_portchk_set_interval,
281 },
282 {
283 N_("portcheckminport"),
284 sh_portchk_set_minport,
285 },
286 {
287 N_("portcheckmaxport"),
288 sh_portchk_set_maxport,
289 },
290 {
291 N_("portcheckudp"),
292 sh_portchk_set_udp,
293 },
294 {
295 NULL,
296 NULL
297 }
298};
299
300#endif
301
302/* Interface to initialize port check
303 */
304int sh_portchk_init (struct mod_type * arg);
305
306/* Interface to reset port check
307 */
308int sh_portchk_reset (void);
309
310/* Interface to run port check
311 */
312int sh_portchk_check (void);
313
314
315static char * check_services (int port, int proto);
316
317#ifdef TEST_ONLY
318
319static int portchk_debug = 0;
320#define SH_ALLOC malloc
321#define SH_FREE free
322#define sh_util_strdup strdup
323#define sl_strlcpy strncpy
324#define _(a) a
325
326#else
327
328static int portchk_debug = 0;
329
330#endif
331
332#ifdef HAVE_RPC_RPC_H
333static char * sh_getrpcbynumber (int number, char * buf, size_t len)
334{
335 FILE * fp;
336
337 if (NULL != (fp = fopen(_("/etc/rpc"), "r")))
338 {
339 sh_string * s = sh_string_new(0);
340 while (0 < sh_string_read(s, fp, 1024))
341 {
342 char * p = sh_string_str(s);
343 while (*p && (*p == ' ' || *p == '\t')) ++p; /* skip whitespace */
344 if (*p == '\0' || *p == '#')
345 continue; /* skip comment */
346 else
347 {
348 size_t lengths[3];
349 unsigned int fields = 3;
350 char * q = sh_string_str(s);
351 char ** splits = split_array_ws(q, &fields, lengths);
352
353 if (fields >= 2)
354 {
355 int n = atoi(splits[1]);
356 if (n == number)
357 {
358 sl_strlcpy(buf, splits[0], len);
359 SH_FREE(splits);
360 sh_string_destroy(&s);
361 sl_fclose(FIL__, __LINE__, fp);
362 return buf;
363 }
364 }
365 SH_FREE(splits);
366 }
367 }
368 sh_string_destroy(&s);
369 sl_fclose(FIL__, __LINE__, fp);
370 }
371 return NULL;
372}
373#endif
374
375static char * sh_getservbyport (int port, const char * proto_in, char * buf, size_t len)
376{
377 FILE * fp;
378 char proto[8];
379
380 sl_strlcpy(proto, proto_in, sizeof(proto));
381
382 if (NULL != (fp = fopen(_("/etc/services"), "r")))
383 {
384 sh_string * s = sh_string_new(0);
385 while (0 < sh_string_read(s, fp, 1024))
386 {
387 char * p = sh_string_str(s);
388 while (*p && (*p == ' ' || *p == '\t')) ++p; /* skip whitespace */
389 if (*p == '\0' || *p == '#')
390 continue; /* skip comment */
391 else
392 {
393 size_t lengths[3];
394 unsigned int fields = 3;
395 char * q = sh_string_str(s);
396 char ** splits = split_array_ws(q, &fields, lengths);
397
398 if (fields >= 2)
399 {
400 char * end;
401 long n = strtol(splits[1], &end, 10);
402 if (n == port && end && (*end == '/' || *end == ','))
403 {
404 ++end;
405 if (0 == strcmp(end, proto))
406 {
407 sl_strlcpy(buf, splits[0], len);
408 SH_FREE(splits);
409 sh_string_destroy(&s);
410 sl_fclose(FIL__, __LINE__, fp);
411 return buf;
412 }
413 }
414 }
415 SH_FREE(splits);
416 }
417 }
418 sh_string_destroy(&s);
419 sl_fclose(FIL__, __LINE__, fp);
420 }
421 return NULL;
422}
423
424static void sh_portchk_add_to_list (int proto,
425 int port, struct sh_sockaddr * paddr,
426 char * service,
427 int flag, int status)
428{
429 struct sh_portentry * new = SH_ALLOC (sizeof(struct sh_portentry));
430
431 if (portchk_debug)
432 fprintf(stderr, _("add to list: port %d/%s %d %d (%s)\n"),
433 port, SH_PROTO_STR(proto), flag, status, service ? service : _("undef"));
434
435 new->port = port;
436 sh_ipvx_ntoa(new->interface, SH_INTERFACE_SIZE, paddr);
437 new->status = status;
438 new->flag = flag;
439
440 new->error = NULL;
441
442 if (service)
443 new->service = sh_util_strdup (service);
444 else
445 new->service = NULL;
446 if (proto == IPPROTO_TCP)
447 {
448 new->next = portlist_tcp;
449 portlist_tcp = new;
450 }
451 else
452 {
453 new->next = portlist_udp;
454 portlist_udp = new;
455 }
456 return;
457}
458
459/* Reset the list by setting all entries to UNKN.
460 * In the next cycle we will check, and set found ports to ISOK.
461 * Thereafter, we check for entries that are still UNKN.
462 */
463static void sh_portchk_reset_lists (void)
464{
465 struct sh_portentry * portlist;
466
467 portlist = portlist_tcp;
468 while (portlist)
469 {
470 if (portlist->status != SH_PORT_MISS)
471 portlist->status = SH_PORT_UNKN;
472 portlist = portlist->next;
473 }
474 portlist = portlist_udp;
475 while (portlist)
476 {
477 if (portlist->status != SH_PORT_MISS)
478 portlist->status = SH_PORT_UNKN;
479 portlist = portlist->next;
480 }
481 return;
482}
483
484static struct sh_portentry * sh_portchk_kill_list (struct sh_portentry * head)
485{
486 if (head)
487 {
488 if (head->next)
489 sh_portchk_kill_list (head->next);
490
491 if (head->service)
492 SH_FREE(head->service);
493 SH_FREE(head);
494 }
495 return NULL;
496}
497
498static struct sh_port * sh_portchk_kill_blacklist (struct sh_port * head)
499{
500 if (head)
501 {
502 if (head->next)
503 sh_portchk_kill_blacklist (head->next);
504
505 SH_FREE(head->paddr);
506 SH_FREE(head);
507 }
508 return NULL;
509}
510
511/* These variables are not used anywhere. They only exist
512 * to assign &pre, &ptr to them, which keeps gcc from
513 * putting it into a register, and avoids the 'clobbered
514 * by longjmp' warning. And no, 'volatile' proved insufficient.
515 */
516static void * sh_dummy_pre = NULL;
517static void * sh_dummy_ptr = NULL;
518
519/* check the list of open ports for any that are marked as UNKN
520 */
521static void sh_portchk_check_list (struct sh_portentry ** head, int proto, int report)
522{
523 struct sh_portentry * ptr = *head;
524 struct sh_portentry * pre = *head;
525 char errbuf[256];
526
527 /* Take the address to keep gcc from putting them into registers.
528 * Avoids the 'clobbered by longjmp' warning.
529 */
530 sh_dummy_pre = (void*) &pre;
531 sh_dummy_ptr = (void*) &ptr;
532
533 while (ptr)
534 {
535 if (portchk_debug && report)
536 fprintf(stderr, _("check list: port %d/%s %d %d\n"),
537 ptr->port, SH_PROTO_STR(proto), ptr->flag, ptr->status);
538
539 if (ptr->status == SH_PORT_UNKN)
540 {
541 /* Don't report missing ports that are marked as optional
542 */
543 if (ptr->flag != SH_PORT_OPT && ptr->flag != SH_PORT_IGN)
544 {
545 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s)"),
546 ptr->interface, ptr->port, SH_PROTO_STR(proto),
547 ptr->service ? ptr->service : check_services(ptr->port, proto));
548#ifdef TEST_ONLY
549 if (report == SH_PORT_REPORT)
550 fprintf(stderr, _("%s\n"), errbuf);
551#else
552 if (report == SH_PORT_REPORT)
553 {
554 SH_MUTEX_LOCK(mutex_thread_nolog);
555 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
556 MSG_PORT_MISS, errbuf);
557 SH_MUTEX_UNLOCK(mutex_thread_nolog);
558 }
559#endif
560 }
561
562 ptr->status = SH_PORT_MISS;
563
564 if ((ptr->flag != SH_PORT_REQ) && (ptr->flag != SH_PORT_OPT) && (ptr->flag != SH_PORT_IGN))
565 {
566 if (portchk_debug && report)
567 fprintf(stderr, _("removing: port %d/%s %d %d\n"),
568 ptr->port, SH_PROTO_STR(proto), ptr->flag, ptr->status);
569
570 if (ptr == *head)
571 {
572 *head = ptr->next;
573 if (ptr->service)
574 SH_FREE(ptr->service);
575 SH_FREE(ptr);
576 ptr = *head;
577 pre = *head;
578 continue;
579 }
580 else if (ptr->next == NULL)
581 {
582 pre->next = NULL;
583 if (ptr->service)
584 SH_FREE(ptr->service);
585 SH_FREE(ptr);
586 return;
587 }
588 else
589 {
590 pre->next = ptr->next;
591 if (ptr->service)
592 SH_FREE(ptr->service);
593 SH_FREE(ptr);
594 ptr = pre->next;
595 continue;
596 }
597 }
598 }
599 pre = ptr;
600 ptr = ptr->next;
601 }
602 return;
603}
604
605
606static struct sh_portentry * sh_portchk_get_from_list (int proto, int port,
607 struct sh_sockaddr * paddr, char * service)
608{
609 struct sh_portentry * portlist;
610 char str_addr[SH_IP_BUF];
611
612 if (proto == IPPROTO_TCP)
613 portlist = portlist_tcp;
614 else
615 portlist = portlist_udp;
616
617 sh_ipvx_ntoa(str_addr, sizeof(str_addr), paddr);
618
619 if (service)
620 {
621 while (portlist)
622 {
623 if (portlist->service &&
624 0 == strcmp(service, portlist->service) &&
625 ( 0 == strcmp(portlist->interface, str_addr) ||
626 sh_ipvx_isany(paddr) ))
627 return portlist;
628 portlist = portlist->next;
629 }
630 }
631 else
632 {
633 while (portlist)
634 {
635 if (port == portlist->port &&
636 (0 == strcmp(portlist->interface, str_addr) ||
637 sh_ipvx_isany(paddr) ))
638 return portlist;
639 portlist = portlist->next;
640 }
641 }
642 return NULL;
643}
644
645
646static void sh_portchk_cmp_to_list (int proto, int port, struct sh_sockaddr * paddr, char * service)
647{
648 struct sh_portentry * portent;
649 char errbuf[256];
650
651
652 portent = sh_portchk_get_from_list (proto, port, paddr, service);
653
654 if (service)
655 {
656 if (!portent)
657 {
658 char * path;
659 unsigned long qpid;
660 char user[USER_MAX];
661 char saddr[SH_IP_BUF];
662
663 sh_ipvx_ntoa(saddr, sizeof(saddr), paddr);
664
665 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s)"),
666 saddr, port, SH_PROTO_STR(proto), service);
667#ifdef TEST_ONLY
668 fprintf(stderr, _("open port: %s:%d/%s (%s)\n"),
669 saddr, port, SH_PROTO_STR(proto), service);
670#else
671 path = sh_port2proc_query(proto, paddr, port, &qpid, user, sizeof(user));
672 SH_MUTEX_LOCK(mutex_thread_nolog);
673 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
674 MSG_PORT_NEW, errbuf, path, qpid, user);
675 SH_MUTEX_UNLOCK(mutex_thread_nolog);
676 SH_FREE(path);
677#endif
678 /*
679 * was not there, thus it is not in 'required' or 'optional' list
680 */
681 sh_portchk_add_to_list (proto, port, paddr, service, SH_PORT_NOT, SH_PORT_ISOK);
682 }
683 else if (portent->status == SH_PORT_MISS && portent->flag != SH_PORT_IGN)
684 {
685 char * path;
686 unsigned long qpid;
687 char user[USER_MAX];
688 char saddr[SH_IP_BUF];
689
690 sh_ipvx_ntoa(saddr, sizeof(saddr), paddr);
691
692 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s), was %d/%s"),
693 saddr, port, SH_PROTO_STR(proto), service, portent->port, SH_PROTO_STR(proto));
694#ifdef TEST_ONLY
695 fprintf(stderr, _("service: %s\n"), errbuf);
696#else
697 path = sh_port2proc_query(proto, paddr, port, &qpid, user, sizeof(user));
698 SH_MUTEX_LOCK(mutex_thread_nolog);
699 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
700 MSG_PORT_RESTART, errbuf, path, qpid, user);
701 SH_MUTEX_UNLOCK(mutex_thread_nolog);
702 SH_FREE(path);
703#endif
704
705 portent->status = SH_PORT_ISOK;
706 }
707 else if (port != portent->port && (-1) != portent->port)
708 {
709 char * path;
710 unsigned long qpid;
711 char user[USER_MAX];
712 char saddr[SH_IP_BUF];
713
714 sh_ipvx_ntoa(saddr, sizeof(saddr), paddr);
715
716 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s), was %d/%s"),
717 saddr, port, SH_PROTO_STR(proto), service, portent->port, SH_PROTO_STR(proto));
718#ifdef TEST_ONLY
719 fprintf(stderr, _("service: %s\n"), errbuf);
720#else
721 path = sh_port2proc_query(proto, paddr, port, &qpid, user, sizeof(user));
722 SH_MUTEX_LOCK(mutex_thread_nolog);
723 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
724 MSG_PORT_NEWPORT, errbuf, path, qpid, user);
725 SH_MUTEX_UNLOCK(mutex_thread_nolog);
726 SH_FREE(path);
727#endif
728 portent->port = port;
729 portent->status = SH_PORT_ISOK;
730 }
731 else
732 {
733 portent->status = SH_PORT_ISOK;
734 }
735 }
736 else
737 {
738 if (!portent)
739 {
740 char * path;
741 unsigned long qpid;
742 char user[USER_MAX];
743 char saddr[SH_IP_BUF];
744
745 sh_ipvx_ntoa(saddr, sizeof(saddr), paddr);
746
747 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s)"),
748 saddr, port, SH_PROTO_STR(proto), check_services(port, proto));
749#ifdef TEST_ONLY
750 fprintf(stderr, _("open port: %s:%d/%s (%s)\n"),
751 saddr, port, SH_PROTO_STR(proto), check_services(port, proto));
752#else
753 path = sh_port2proc_query(proto, paddr, port, &qpid, user, sizeof(user));
754 SH_MUTEX_LOCK(mutex_thread_nolog);
755 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
756 MSG_PORT_NEW, errbuf, path, qpid, user);
757 SH_MUTEX_UNLOCK(mutex_thread_nolog);
758 SH_FREE(path);
759#endif
760
761 /* was not there, thus it is not in 'required' or 'optional' list
762 */
763 sh_portchk_add_to_list (proto, port, paddr, service, SH_PORT_NOT, SH_PORT_ISOK);
764 }
765 else if (portent->status == SH_PORT_MISS && portent->flag != SH_PORT_IGN)
766 {
767 char * path;
768 unsigned long qpid;
769 char user[USER_MAX];
770 char saddr[SH_IP_BUF];
771
772 sh_ipvx_ntoa(saddr, sizeof(saddr), paddr);
773
774 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s)"),
775 saddr, port, SH_PROTO_STR(proto), check_services(port, proto));
776#ifdef TEST_ONLY
777 fprintf(stderr, _("port : %s\n"), errbuf);
778#else
779 path = sh_port2proc_query(proto, paddr, port, &qpid, user, sizeof(user));
780 SH_MUTEX_LOCK(mutex_thread_nolog);
781 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
782 MSG_PORT_RESTART, errbuf, path, qpid, user);
783 SH_MUTEX_UNLOCK(mutex_thread_nolog);
784 SH_FREE(path);
785#endif
786
787 portent->status = SH_PORT_ISOK;
788 }
789 else
790 {
791 portent->status = SH_PORT_ISOK;
792 }
793 }
794
795 return;
796}
797
798
799/* Returns a static buffer containing the name of the service
800 * running on port <port> (from /etc/services)
801 * Returns NULL on failure
802 */
803static char * check_services (int port, int proto)
804{
805 static char buf[256];
806 char * service = sh_getservbyport(port, SH_PROTO_STR(proto), buf, sizeof(buf));
807
808 if (!service)
809 {
810 snprintf (buf, sizeof(buf), "%s",_("unknown"));
811 }
812 return buf;
813}
814
815/* Returns a static buffer containing the name of the service
816 * running on port <port> at <address> (from portmap daemon)
817 * Returns NULL on failure
818 */
819static char * check_rpc_list (int port, struct sockaddr_in * address,
820 unsigned long prot)
821{
822#ifdef HAVE_RPC_RPC_H
823 struct pmaplist * head;
824 char *r;
825 static char buf[256];
826
827 head = pmap_getmaps(address);
828
829 if (head)
830 {
831 do /* while (head != NULL) */
832 {
833 if ((head->pml_map.pm_prot == prot) &&
834 (port == (int)head->pml_map.pm_port))
835 {
836 r = sh_getrpcbynumber((int)head->pml_map.pm_prog,
837 buf, sizeof(buf));
838 if (r)
839 {
840 return buf;
841 }
842 else
843 {
844 snprintf (buf, sizeof(buf), "RPC_%lu",
845 (unsigned long)head->pml_map.pm_prog);
846 return buf;
847 }
848 }
849 head = head->pml_next;
850 }
851 while (head != NULL);
852 }
853#else
854 (void) port;
855 (void) address;
856 (void) prot;
857#endif
858 return NULL;
859}
860
861static int check_port_udp_internal (int fd, int port, struct sh_sockaddr * paddr)
862{
863 int retval;
864 char * p = NULL;
865 char buf[8];
866#ifndef TEST_ONLY
867 char errmsg[256];
868 int nerr;
869#endif
870 char errbuf[SH_ERRBUF_SIZE];
871 char ipbuf[SH_IP_BUF];
872
873 sh_ipvx_set_port(paddr, port);
874
875 do {
876 retval = connect(fd, sh_ipvx_sockaddr_cast(paddr), SH_SSP_LEN(paddr));
877 } while (retval < 0 && (errno == EINTR || errno == EINPROGRESS));
878
879 if (retval == -1)
880 {
881#ifdef TEST_ONLY
882 if (portchk_debug)
883 perror(_("connect"));
884#else
885 sh_ipvx_ntoa(ipbuf, sizeof(ipbuf), paddr);
886
887 nerr = errno;
888 sl_snprintf(errmsg, sizeof(errmsg), _("check port: %5d/udp on %15s: %s"),
889 port, ipbuf, sh_error_message(errno, errbuf, sizeof(errbuf)));
890 SH_MUTEX_LOCK(mutex_thread_nolog);
891 sh_error_handle((-1), FIL__, __LINE__, nerr, MSG_E_SUBGEN,
892 errmsg, _("connect"));
893 SH_MUTEX_UNLOCK(mutex_thread_nolog);
894#endif
895 }
896 else
897 {
898 do {
899 retval = send (fd, buf, 0, 0);
900 } while (retval < 0 && errno == EINTR);
901
902 if (retval == -1 && errno == ECONNREFUSED)
903 {
904 sh_ipvx_ntoa(ipbuf, sizeof(ipbuf), paddr);
905 if (portchk_debug)
906 fprintf(stderr, _("check port: %5d/udp on %15s established/time_wait\n"),
907 port, ipbuf);
908 }
909 else
910 {
911 /* Only the second send() may catch the error
912 */
913 do {
914 retval = send (fd, buf, 0, 0);
915 } while (retval < 0 && errno == EINTR);
916
917 if (retval == -1 && errno == ECONNREFUSED)
918 {
919 sh_ipvx_ntoa(ipbuf, sizeof(ipbuf), paddr);
920 if (portchk_debug)
921 fprintf(stderr, _("check port: %5d/udp on %15s established/time_wait\n"),
922 port, ipbuf);
923 }
924 else if (retval != -1)
925 {
926 /* Try to get service name from portmap
927 */
928 if (paddr->ss_family == AF_INET)
929 {
930 p = check_rpc_list (port, (struct sockaddr_in *) sh_ipvx_sockaddr_cast(paddr), IPPROTO_UDP);
931 }
932
933 sh_portchk_cmp_to_list (IPPROTO_UDP, port, paddr, p ? p : NULL);
934
935 /* If not an RPC service, try to get name from /etc/services
936 */
937 if (!p)
938 p = check_services(port, IPPROTO_UDP);
939
940 if (portchk_debug)
941 {
942 sh_ipvx_ntoa(ipbuf, sizeof(ipbuf), paddr);
943 fprintf(stderr, _("check port: %5d/udp on %15s open %s\n"),
944 port, ipbuf, p);
945 }
946
947 }
948 }
949 }
950 sl_close_fd (FIL__, __LINE__, fd);
951 return 0;
952}
953
954static int check_port_tcp_internal (int fd, int port, struct sh_sockaddr * paddr)
955{
956 int retval;
957 int flags;
958 char * p = NULL;
959#ifndef TEST_ONLY
960 char errmsg[256];
961 int nerr;
962#endif
963 char errbuf[SH_ERRBUF_SIZE];
964 char ipbuf[SH_IP_BUF];
965
966 sh_ipvx_set_port(paddr, port);
967
968 do {
969 retval = connect(fd, sh_ipvx_sockaddr_cast(paddr), SH_SSP_LEN(paddr));
970 } while (retval < 0 && (errno == EINTR || errno == EINPROGRESS));
971
972 if (retval == -1 && errno == ECONNREFUSED)
973 {
974 if (portchk_debug)
975 {
976 sh_ipvx_ntoa(ipbuf, sizeof(ipbuf), paddr);
977 fprintf(stderr, _("check port: %5d on %15s established/time_wait\n"),
978 port, ipbuf);
979 }
980 }
981 else if (retval == -1)
982 {
983#ifdef TEST_ONLY
984 if (portchk_debug)
985 perror(_("connect"));
986#else
987 sh_ipvx_ntoa(ipbuf, sizeof(ipbuf), paddr);
988 nerr = errno;
989 sl_snprintf(errmsg, sizeof(errmsg), _("check port: %5d/tcp on %15s: %s"),
990 port, ipbuf, sh_error_message(errno, errbuf, sizeof(errbuf)));
991 SH_MUTEX_LOCK(mutex_thread_nolog);
992 sh_error_handle((-1), FIL__, __LINE__, nerr, MSG_E_SUBGEN,
993 errmsg, _("connect"));
994 SH_MUTEX_UNLOCK(mutex_thread_nolog);
995#endif
996 }
997 else
998 {
999 /* Try to get service name from portmap
1000 */
1001 if (paddr->ss_family == AF_INET)
1002 {
1003 p = check_rpc_list (port, (struct sockaddr_in *) sh_ipvx_sockaddr_cast(paddr), IPPROTO_TCP);
1004 }
1005
1006 sh_portchk_cmp_to_list (IPPROTO_TCP, port, paddr, p ? p : NULL);
1007
1008 /* If not an RPC service, try to get name from /etc/services
1009 */
1010 if (!p)
1011 p = check_services(port, IPPROTO_TCP);
1012
1013 if (portchk_debug)
1014 {
1015 sh_ipvx_ntoa(ipbuf, sizeof(ipbuf), paddr);
1016 fprintf(stderr, _("check port: %5d on %15s open %s\n"),
1017 port, ipbuf, p);
1018 }
1019
1020#if !defined(O_NONBLOCK)
1021#if defined(O_NDELAY)
1022#define O_NONBLOCK O_NDELAY
1023#else
1024#define O_NONBLOCK 0
1025#endif
1026#endif
1027
1028 /* prepare to close connection gracefully
1029 */
1030 if (port == 22) /* ssh */
1031 {
1032 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
1033 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
1034 retval = write (fd, _("SSH-2.0-Foobar"), 14);
1035 if (retval > 0) retval = write (fd, "\r\n", 2);
1036 }
1037 else if (port == 25) /* smtp */
1038 {
1039 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
1040 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
1041 retval = write (fd, _("QUIT"), 4);
1042 if (retval > 0) retval = write (fd, "\r\n", 2);
1043 }
1044 else if (port == 79) /* finger */
1045 {
1046 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
1047 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
1048 retval = write (fd, "\r\n", 2);
1049 }
1050 else if (port == 110) /* pop3 */
1051 {
1052 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
1053 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
1054 retval = write (fd, _("QUIT"), 4);
1055 if (retval > 0) retval = write (fd, "\r\n", 2);
1056 }
1057 else if (port == 143) /* imap */
1058 {
1059 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
1060 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
1061 retval = write (fd, _("A01 LOGOUT"), 10);
1062 if (retval > 0) retval = write (fd, "\r\n", 2);
1063 }
1064
1065 if (portchk_debug && retval < 0)
1066 fprintf(stderr, _("check port: error writing to port %5d\n"),
1067 port);
1068 }
1069 sl_close_fd (FIL__, __LINE__, fd);
1070 return 0;
1071}
1072
1073/* typedef uint32_t in_addr_t;
1074 * struct in_addr
1075 * {
1076 * in_addr_t s_addr;
1077 * };
1078 */
1079
1080#define SH_IFACE_MAX 16
1081
1082struct portchk_interfaces {
1083 struct sh_sockaddr iface[SH_IFACE_MAX];
1084 int used;
1085};
1086
1087static struct portchk_interfaces iface_list;
1088static int iface_initialized = 0;
1089
1090#ifdef TEST_ONLY
1091static char * portchk_hostname = NULL;
1092#else
1093static char * portchk_hostname = sh.host.name;
1094#endif
1095
1096static int sh_portchk_init_internal (void)
1097{
1098 volatile int i; /* might be clobbered by ‘longjmp’ or ‘vfork’*/
1099 char errbuf[256];
1100#if defined(USE_IPVX)
1101 struct addrinfo hints;
1102 struct addrinfo *res;
1103#else
1104 struct hostent * hent;
1105#endif
1106 char ipbuf[SH_IP_BUF];
1107
1108 if (portchk_debug)
1109 fprintf(stderr, _("checking ports on: %s\n"), portchk_hostname ? portchk_hostname : _("NULL"));
1110
1111 if (!portchk_hostname)
1112 return -1;
1113
1114 if (sh_portchk_active == S_FALSE)
1115 return -1;
1116
1117 SH_MUTEX_LOCK(mutex_port_check);
1118 if (iface_initialized == 0)
1119 {
1120 iface_list.used = 0;
1121 iface_initialized = 1;
1122 }
1123
1124#if !defined(USE_IPVX)
1125 SH_MUTEX_LOCK(mutex_resolv);
1126 hent = sh_gethostbyname(portchk_hostname);
1127 i = 0;
1128 while (hent && hent->h_addr_list[i] && (iface_list.used < SH_IFACE_MAX))
1129 {
1130 struct sockaddr_in sin;
1131
1132 memcpy(&(sin.sin_addr.s_addr), hent->h_addr_list[i], sizeof(in_addr_t));
1133 sh_ipvx_save(&(iface_list.iface[iface_list.used]),
1134 AF_INET, (struct sockaddr *)&sin);
1135 ++iface_list.used;
1136 ++i;
1137 }
1138 SH_MUTEX_UNLOCK(mutex_resolv);
1139#else
1140 memset(&hints, '\0', sizeof(hints));
1141 hints.ai_family = PF_UNSPEC;
1142 hints.ai_flags = AI_ADDRCONFIG;
1143
1144 if (0 == getaddrinfo(portchk_hostname, NULL, &hints, &res))
1145 {
1146 struct addrinfo *p = res;
1147
1148 while ((p != NULL) && (iface_list.used < SH_IFACE_MAX))
1149 {
1150 sh_ipvx_save(&(iface_list.iface[iface_list.used]),
1151 p->ai_family, p->ai_addr);
1152 ++iface_list.used;
1153 p = p->ai_next;
1154 }
1155 freeaddrinfo(res);
1156 }
1157#endif
1158
1159 for (i = 0; i < iface_list.used; ++i)
1160 {
1161 sh_ipvx_ntoa(ipbuf, sizeof(ipbuf), &(iface_list.iface[i]));
1162 sl_snprintf(errbuf, sizeof(errbuf), _("interface: %s"), ipbuf);
1163
1164 SH_MUTEX_LOCK(mutex_thread_nolog);
1165 sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1166 errbuf, _("sh_portchk_init"));
1167 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1168 }
1169 SH_MUTEX_UNLOCK(mutex_port_check);
1170
1171 return 0;
1172}
1173
1174int sh_portchk_init (struct mod_type * arg)
1175{
1176#ifndef HAVE_PTHREAD
1177 (void) arg;
1178#endif
1179
1180 if (sh_portchk_active == S_FALSE)
1181 return SH_MOD_FAILED;
1182 if (!portchk_hostname)
1183 return SH_MOD_FAILED;
1184
1185#ifdef HAVE_PTHREAD
1186 if (arg != NULL && arg->initval < 0 &&
1187 (sh.flag.isdaemon == S_TRUE || sh.flag.loop == S_TRUE))
1188 {
1189 if (0 == sh_pthread_create(sh_threaded_module_run, (void *)arg))
1190 return SH_MOD_THREAD;
1191 else
1192 return SH_MOD_FAILED;
1193 }
1194#endif
1195 return sh_portchk_init_internal();
1196}
1197
1198
1199
1200#if !defined(TEST_ONLY)
1201int sh_portchk_reconf (void)
1202{
1203 SH_MUTEX_LOCK(mutex_port_check);
1204 iface_initialized = 0;
1205 sh_portchk_active = 1;
1206 sh_portchk_check_udp = 1;
1207 sh_portchk_interval = SH_PORTCHK_INTERVAL;
1208
1209 sh_portchk_minport = -1;
1210 sh_portchk_maxport = -1;
1211
1212 portlist_udp = sh_portchk_kill_list (portlist_udp);
1213 portlist_tcp = sh_portchk_kill_list (portlist_tcp);
1214
1215 blacklist_udp = sh_portchk_kill_blacklist (blacklist_udp);
1216 blacklist_tcp = sh_portchk_kill_blacklist (blacklist_tcp);
1217 sh_port2proc_finish();
1218
1219 SH_MUTEX_UNLOCK(mutex_port_check);
1220 return 0;
1221}
1222
1223int sh_portchk_cleanup (void)
1224{
1225 return sh_portchk_reconf ();
1226}
1227
1228int sh_portchk_timer (time_t tcurrent)
1229{
1230 static time_t lastcheck = 0;
1231
1232 SL_ENTER(_("sh_portchk_timer"));
1233 if ((time_t) (tcurrent - lastcheck) >= sh_portchk_interval)
1234 {
1235 lastcheck = tcurrent;
1236 SL_RETURN((-1), _("sh_portchk_timer"));
1237 }
1238 SL_RETURN(0, _("sh_portchk_timer"));
1239}
1240#endif
1241
1242static int check_port_generic (int port, int domain, int type, int protocol)
1243{
1244 volatile int i = 0;
1245 int sock = -1;
1246 int flag = 1; /* non-zero to enable an option */
1247 struct sh_sockaddr paddr;
1248 char errbuf[SH_ERRBUF_SIZE];
1249
1250 /* Check all interfaces for this host
1251 */
1252 while (i < iface_list.used)
1253 {
1254 memcpy(&paddr, &(iface_list.iface[i]), sizeof(paddr));
1255
1256 if (paddr.ss_family != domain)
1257 {
1258 ++i;
1259 continue;
1260 }
1261
1262 if (0 != sh_portchk_is_blacklisted(port, &paddr, protocol))
1263 {
1264 ++i;
1265 continue;
1266 }
1267
1268 if ((sock = socket(paddr.ss_family, type, protocol)) < 0 )
1269 {
1270 ++i;
1271#ifdef TEST_ONLY
1272 if (portchk_debug)
1273 perror(_("socket"));
1274#else
1275 SH_MUTEX_LOCK(mutex_thread_nolog);
1276 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1277 sh_error_message(errno, errbuf, sizeof(errbuf)), _("socket"));
1278 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1279#endif
1280 continue;
1281 }
1282 if ( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
1283 (void *) &flag, sizeof(flag)) < 0 )
1284 {
1285 ++i;
1286#ifdef TEST_ONLY
1287 if (portchk_debug)
1288 perror(_("setsockopt"));
1289#else
1290 SH_MUTEX_LOCK(mutex_thread_nolog);
1291 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1292 sh_error_message(errno, errbuf, sizeof(errbuf)),_("setsockopt"));
1293 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1294#endif
1295 continue;
1296 }
1297
1298
1299 if (protocol == IPPROTO_TCP)
1300 check_port_tcp_internal(sock, port, &paddr);
1301 else
1302 check_port_udp_internal(sock, port, &paddr);
1303
1304 ++i;
1305 }
1306
1307 return 0;
1308}
1309
1310
1311
1312static int check_port_udp (int port, int domain)
1313{
1314 return check_port_generic(port, domain, SOCK_DGRAM, IPPROTO_UDP);
1315}
1316
1317static int check_port_tcp (int port, int domain)
1318{
1319 return check_port_generic(port, domain, SOCK_STREAM, IPPROTO_TCP);
1320}
1321
1322
1323static int sh_portchk_scan_ports_generic (int min_port, int max_port_arg,
1324 int domain, int type, int protocol)
1325{
1326 /*
1327 int min_port = 1024;
1328 int max_port = 65535;
1329 */
1330
1331 volatile int port; /* might be clobbered by ‘longjmp’ or ‘vfork’*/
1332 volatile int max_port = max_port_arg;
1333 int retval;
1334 int sock = -1;
1335 int flag = 1; /* non-zero to enable an option */
1336
1337 struct sockaddr_in addr4;
1338 struct sockaddr_in6 addr6;
1339
1340 int addrlen4 = sizeof(addr4);
1341 int addrlen6 = sizeof(addr6);
1342
1343 struct in6_addr anyaddr = IN6ADDR_ANY_INIT;
1344
1345 char errbuf[SH_ERRBUF_SIZE];
1346
1347 if (min_port == -1)
1348 min_port = 0;
1349 if (max_port == -1)
1350 max_port = 65535;
1351
1352 for (port = min_port; port <= max_port; ++port)
1353 {
1354 if ((sock = socket(domain, type, protocol)) < 0 )
1355 {
1356#ifdef TEST_ONLY
1357 if (portchk_debug)
1358 perror(_("socket"));
1359#else
1360 SH_MUTEX_LOCK(mutex_thread_nolog);
1361 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1362 sh_error_message(errno, errbuf, sizeof(errbuf)), _("socket"));
1363 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1364#endif
1365 continue;
1366 }
1367 if ( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
1368 (void *) &flag, sizeof(flag)) < 0 )
1369 {
1370#ifdef TEST_ONLY
1371 if (portchk_debug)
1372 perror(_("setsockopt"));
1373#else
1374 SH_MUTEX_LOCK(mutex_thread_nolog);
1375 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1376 sh_error_message(errno, errbuf, sizeof(errbuf)),_("setsockopt"));
1377 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1378#endif
1379 continue;
1380 }
1381
1382 if (domain == AF_INET)
1383 {
1384 addr4.sin_family = AF_INET;
1385 addr4.sin_port = htons(port);
1386 addr4.sin_addr.s_addr = INADDR_ANY;
1387 retval = bind (sock, (struct sockaddr *) &addr4, addrlen4);
1388 }
1389 else
1390 {
1391 addr6.sin6_family = AF_INET6;
1392 addr6.sin6_port = htons(port);
1393 memcpy(&(addr6.sin6_addr.s6_addr), &anyaddr, sizeof(anyaddr));
1394 retval = bind (sock, (struct sockaddr *) &addr6, addrlen6);
1395 }
1396
1397 if (retval == 0)
1398 {
1399 /* we can bind the port, thus it is unused
1400 */
1401 sl_close_fd (FIL__, __LINE__, sock);
1402 }
1403 else
1404 {
1405 if (errno == EINVAL || errno == EADDRINUSE)
1406 {
1407 /* try to connect to the port
1408 */
1409 if (protocol == IPPROTO_TCP)
1410 check_port_tcp(port, domain);
1411 else
1412 check_port_udp(port, domain);
1413 }
1414 else
1415 {
1416#ifdef TEST_ONLY
1417 if (portchk_debug)
1418 perror(_("bind"));
1419#else
1420 SH_MUTEX_LOCK(mutex_thread_nolog);
1421 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1422 sh_error_message(errno, errbuf, sizeof(errbuf)), _("bind"));
1423 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1424#endif
1425 }
1426 sl_close_fd (FIL__, __LINE__, sock);
1427 }
1428 }
1429 return 0;
1430}
1431
1432static int sh_portchk_scan_ports_tcp (int min_port, int max_port)
1433{
1434#if defined(USE_IPVX)
1435 sh_portchk_scan_ports_generic (min_port, max_port, AF_INET6,
1436 SOCK_STREAM, IPPROTO_TCP);
1437#endif
1438 return sh_portchk_scan_ports_generic (min_port, max_port, AF_INET,
1439 SOCK_STREAM, IPPROTO_TCP);
1440}
1441
1442static int sh_portchk_scan_ports_udp (int min_port, int max_port)
1443{
1444#if defined(USE_IPVX)
1445 sh_portchk_scan_ports_generic (min_port, max_port, AF_INET6,
1446 SOCK_DGRAM, IPPROTO_UDP);
1447#endif
1448 return sh_portchk_scan_ports_generic (min_port, max_port, AF_INET,
1449 SOCK_DGRAM, IPPROTO_UDP);
1450}
1451
1452/* Subroutine to add an interface
1453 */
1454static void * sh_dummy_str = NULL; /* fix clobbered by.. warning */
1455
1456static int sh_portchk_add_interface (const char * str)
1457{
1458 struct sh_sockaddr saddr;
1459 char errbuf[256];
1460 char buf[64];
1461
1462 sh_dummy_str = (void*) &str;
1463
1464 if (iface_initialized == 0)
1465 {
1466 iface_list.used = 0;
1467 iface_initialized = 1;
1468 }
1469
1470 do {
1471
1472 while (*str == ',' || *str == ' ' || *str == '\t') ++str;
1473
1474 if (*str)
1475 {
1476 char ipbuf[SH_IP_BUF];
1477 unsigned int i = 0;
1478 while (*str && i < (sizeof(buf)-1) &&
1479 *str != ',' && *str != ' ' && *str != '\t')
1480 {
1481 buf[i] = *str; ++str; ++i;
1482 }
1483 buf[i] = '\0';
1484
1485 if (0 == sh_ipvx_aton(buf, &saddr))
1486 return -1;
1487
1488 if (iface_list.used == SH_IFACE_MAX)
1489 return -1;
1490
1491 sh_ipvx_ntoa(ipbuf, sizeof(ipbuf), &saddr);
1492 sl_snprintf(errbuf, sizeof(errbuf), _("interface: %s"), ipbuf);
1493 SH_MUTEX_LOCK(mutex_thread_nolog);
1494 sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1495 errbuf, _("sh_portchk_add_interface"));
1496 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1497
1498 memcpy (&(iface_list.iface[iface_list.used]), &(saddr), sizeof(saddr));
1499 ++iface_list.used;
1500 }
1501 } while (*str);
1502
1503 return 0;
1504}
1505
1506/* verify whether port/interface is blacklisted (do not check)
1507 */
1508static int sh_portchk_is_blacklisted(int port, struct sh_sockaddr * saddr,
1509 int proto)
1510{
1511 struct sh_port * head;
1512
1513 if (proto == IPPROTO_TCP)
1514 head = blacklist_tcp;
1515 else
1516 head = blacklist_udp;
1517
1518 while (head)
1519 {
1520 if (head->port == port)
1521 {
1522 if (sh_ipvx_isany(head->paddr) ||
1523 0 == sh_ipvx_cmp(head->paddr, saddr))
1524 return 1;
1525 else
1526 return 0;
1527 }
1528 head = head->next;
1529 }
1530 return 0;
1531}
1532
1533
1534static int sh_portchk_blacklist(int port, struct sh_sockaddr * saddr, int proto)
1535{
1536 struct sh_port * black;
1537 struct sh_port * head;
1538
1539 if (proto == IPPROTO_TCP)
1540 head = blacklist_tcp;
1541 else
1542 head = blacklist_udp;
1543
1544 black = head;
1545
1546 while (black)
1547 {
1548 if (black->port == port &&
1549 0 == sh_ipvx_cmp(head->paddr, saddr))
1550 return -1;
1551 black = black->next;
1552 }
1553
1554 black = SH_ALLOC (sizeof(struct sh_port));
1555 black->paddr = SH_ALLOC (sizeof(struct sh_sockaddr));
1556 black->port = port;
1557 memcpy(black->paddr, saddr, sizeof(struct sh_sockaddr));
1558 black->next = head;
1559
1560 if (proto == IPPROTO_TCP)
1561 blacklist_tcp = black;
1562 else
1563 blacklist_udp = black;
1564 return 0;
1565}
1566
1567
1568/* Subroutine to add a required or optional port/service
1569 */
1570static int sh_portchk_add_required_port_generic (char * service,
1571 char * interface, int type)
1572{
1573 char buf[256];
1574 int proto;
1575 char * p;
1576 char * endptr;
1577 unsigned long int port;
1578 struct sh_sockaddr saddr;
1579 struct sh_portentry * portent;
1580
1581 if (0 == sh_ipvx_aton(interface, &saddr))
1582 return -1;
1583
1584 sl_strlcpy (buf, service, sizeof(buf));
1585
1586 p = strchr(buf, '/');
1587 if (!p)
1588 return -1;
1589 if (0 == strcmp(p, _("/tcp")))
1590 proto = IPPROTO_TCP;
1591 else if (0 == strcmp(p, _("/udp")))
1592 proto = IPPROTO_UDP;
1593 else
1594 return -1;
1595
1596 *p = '\0';
1597 port = strtoul(buf, &endptr, 0);
1598
1599 /* Blacklisted ports
1600 */
1601 if (*endptr == '\0' && port <= 65535 && type == SH_PORT_BLACKLIST)
1602 return (sh_portchk_blacklist(port, &saddr, proto));
1603
1604 if (*endptr != '\0')
1605 {
1606 portent = sh_portchk_get_from_list (proto, -1, &saddr, buf);
1607 if (!portent)
1608 sh_portchk_add_to_list (proto, -1, &saddr, buf, type, SH_PORT_UNKN);
1609 else
1610 {
1611#ifdef TEST_ONLY
1612 fprintf(stderr, "** WARNING: duplicate port definition %s/%s\n", buf, SH_PROTO_STR(proto));
1613#else
1614 SH_MUTEX_LOCK(mutex_thread_nolog);
1615 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1616 _("duplicate port definition"), _("sh_portchk_add_required_port_generic"));
1617 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1618#endif
1619 return -1;
1620 }
1621 }
1622 else if (port <= 65535)
1623 {
1624 portent = sh_portchk_get_from_list (proto, port, &saddr, NULL);
1625 if (!portent)
1626 sh_portchk_add_to_list (proto, port, &saddr, NULL, type, SH_PORT_UNKN);
1627 else
1628 {
1629#ifdef TEST_ONLY
1630 fprintf(stderr, "** WARNING: duplicate port definition %lu/%s\n", port, SH_PROTO_STR(proto));
1631#else
1632 SH_MUTEX_LOCK(mutex_thread_nolog);
1633 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1634 _("duplicate port definition"), _("sh_portchk_add_required_port_generic"));
1635 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1636#endif
1637 return -1;
1638 }
1639 }
1640 else
1641 return -1;
1642
1643 return 0;
1644}
1645
1646/* Internal interface to add required or optional ports as 'iface:portlist'
1647 */
1648static int sh_portchk_add_required_generic (const char * str, int type)
1649{
1650 size_t len;
1651 size_t ll = 0;
1652 int status;
1653
1654 char * interface = NULL;
1655 char * list;
1656 char * p;
1657#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
1658 char * saveptr;
1659#endif
1660
1661 if (!str)
1662 return -1;
1663
1664 if (strchr(str, ':'))
1665 {
1666 len = strlen(str);
1667 for (ll = 0; ll < len; ++ll)
1668 {
1669 if (str[ll] == ':' || str[ll] == ' ' || str[ll] == '\t')
1670 {
1671 interface = SH_ALLOC(ll+1);
1672 sl_strlcpy(interface, str, ll+1);
1673 interface[ll] = '\0';
1674 while (str[ll] == ':' || str[ll] == ' ' || str[ll] == '\t')
1675 ++ll;
1676 break;
1677 }
1678 }
1679 }
1680 else
1681 {
1682 interface = SH_ALLOC(8);
1683 sl_strlcpy(interface, _("0.0.0.0"), 8);
1684 interface[7] = '\0';
1685 while (str[ll] == ' ' || str[ll] == '\t')
1686 ++ll;
1687 }
1688
1689 if (!interface)
1690 return -1;
1691
1692 if (str[ll] == '\0')
1693 {
1694 SH_FREE(interface);
1695 return -1;
1696 }
1697
1698 if (portchk_debug)
1699 fprintf(stderr, "add ports for interface: %s\n", interface);
1700
1701 list = sh_util_strdup(&str[ll]);
1702#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
1703 p = strtok_r (list, " ,\t", &saveptr);
1704#else
1705 p = strtok (list, " ,\t");
1706#endif
1707 if (!p)
1708 {
1709 SH_FREE(interface);
1710 SH_FREE(list);
1711 return -1;
1712 }
1713 while (p)
1714 {
1715 status = sh_portchk_add_required_port_generic (p, interface, type);
1716
1717 if (-1 == status)
1718 {
1719 SH_FREE(interface);
1720 SH_FREE(list);
1721 return -1;
1722 }
1723#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
1724 p = strtok_r (NULL, " ,\t", &saveptr);
1725#else
1726 p = strtok (NULL, " ,\t");
1727#endif
1728 }
1729 SH_FREE(interface);
1730 SH_FREE(list);
1731 return 0;
1732}
1733
1734/* User interface to add required ports as 'iface:portlist'
1735 */
1736static int sh_portchk_add_required (const char * str)
1737{
1738 return sh_portchk_add_required_generic (str, SH_PORT_REQ);
1739}
1740
1741/* User interface to add optional ports as 'iface:portlist'
1742 */
1743static int sh_portchk_add_optional (const char * str)
1744{
1745 return sh_portchk_add_required_generic (str, SH_PORT_OPT);
1746}
1747
1748/* User interface to add ignoreable ports as 'iface:portlist'
1749 */
1750static int sh_portchk_add_ignore (const char * str)
1751{
1752 return sh_portchk_add_required_generic (str, SH_PORT_IGN);
1753}
1754
1755/* User interface to add ports that should not be checked as 'iface:portlist'
1756 */
1757static int sh_portchk_add_blacklist (const char * str)
1758{
1759 return sh_portchk_add_required_generic (str, SH_PORT_BLACKLIST);
1760}
1761
1762/* Interface to run port check
1763 */
1764int sh_portchk_check ()
1765{
1766 volatile int min_port;
1767
1768 SH_MUTEX_LOCK(mutex_port_check);
1769
1770 min_port = (sh_portchk_minport == -1) ? 0 : sh_portchk_minport;
1771
1772 if (sh_portchk_active != S_FALSE)
1773 {
1774 sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1775 _("Checking for open ports"),
1776 _("sh_portchk_check"));
1777
1778 sh_portchk_reset_lists();
1779 if ((0 != geteuid()) && (min_port < 1024))
1780 {
1781 min_port = 1024;
1782#ifdef TEST_ONLY
1783 fprintf(stderr, "** WARNING not scanning ports < 1024\n");
1784#else
1785 SH_MUTEX_LOCK(mutex_thread_nolog);
1786 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1787 _("not scanning ports below 1024"),
1788 _("sh_portchk_check"));
1789 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1790#endif
1791 }
1792
1793 sh_port2proc_prepare();
1794
1795 min_port = (sh_portchk_minport == -1) ? min_port : sh_portchk_minport;
1796
1797 if (sh_portchk_check_udp == 1)
1798 sh_portchk_scan_ports_udp(min_port, sh_portchk_maxport);
1799 sh_portchk_scan_ports_tcp(min_port, sh_portchk_maxport);
1800
1801
1802 sh_portchk_check_list (&portlist_tcp, IPPROTO_TCP, SH_PORT_REPORT);
1803 if (sh_portchk_check_udp == 1)
1804 sh_portchk_check_list (&portlist_udp, IPPROTO_UDP, SH_PORT_REPORT);
1805
1806 }
1807 SH_MUTEX_UNLOCK(mutex_port_check);
1808 return 0;
1809}
1810#endif
1811
1812#ifdef SH_CUTEST
1813#include "CuTest.h"
1814
1815void Test_portcheck_lists (CuTest *tc)
1816{
1817#if defined(SH_USE_PORTCHECK) && (defined(SH_WITH_CLIENT) || defined(SH_STANDALONE))
1818 struct sh_sockaddr haddr_local;
1819 struct sh_portentry * portent;
1820 char buf[256];
1821 char * p;
1822
1823#ifdef HAVE_RPC_RPC_H
1824 p = sh_getrpcbynumber(0, buf, sizeof(buf));
1825 CuAssertTrue(tc, p == NULL);
1826
1827 p = sh_getrpcbynumber(100000, buf, sizeof(buf));
1828 CuAssertPtrNotNull(tc, p);
1829 CuAssertTrue(tc, (0 == strcmp(p, "portmapper") || 0 == strcmp(p, "rpcbind")));
1830 CuAssertTrue(tc, (0 == strcmp(buf, "portmapper") || 0 == strcmp(p, "rpcbind")));
1831
1832 p = sh_getrpcbynumber(100007, buf, sizeof(buf));
1833 CuAssertPtrNotNull(tc, p);
1834 CuAssertTrue(tc, 0 == strcmp(p, "ypbind"));
1835 CuAssertTrue(tc, 0 == strcmp(buf, "ypbind"));
1836#endif
1837
1838 p = sh_getservbyport(0, SH_PROTO_STR(IPPROTO_UDP), buf, sizeof(buf));
1839 CuAssertTrue(tc, p == NULL);
1840
1841#if !defined(HOST_IS_CYGWIN)
1842 p = sh_getservbyport(22, SH_PROTO_STR(IPPROTO_TCP), buf, sizeof(buf));
1843 CuAssertPtrNotNull(tc, p);
1844 CuAssertTrue(tc, 0 == strcmp(p, "ssh"));
1845 CuAssertTrue(tc, 0 == strcmp(buf, "ssh"));
1846#endif
1847
1848 p = sh_getservbyport(13, SH_PROTO_STR(IPPROTO_UDP), buf, sizeof(buf));
1849 CuAssertPtrNotNull(tc, p);
1850 CuAssertTrue(tc, 0 == strcmp(p, "daytime"));
1851 CuAssertTrue(tc, 0 == strcmp(buf, "daytime"));
1852
1853 CuAssertTrue(tc, 0 != sh_ipvx_aton("127.0.0.1", &haddr_local));
1854
1855 sh_portchk_add_to_list (IPPROTO_TCP, 8000, &haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1856
1857 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, &haddr_local, NULL);
1858 CuAssertPtrNotNull(tc, portent);
1859
1860 CuAssertTrue(tc, portent->port == 8000);
1861 CuAssertTrue(tc, 0 == strcmp("127.0.0.1", portent->interface));
1862 CuAssertTrue(tc, portent->status == SH_PORT_UNKN);
1863 CuAssertTrue(tc, portent->flag == SH_PORT_NOT);
1864
1865 sh_portchk_check_list (&portlist_tcp, IPPROTO_TCP, SH_PORT_NOREPT);
1866
1867 CuAssertTrue(tc, NULL == portlist_tcp);
1868
1869 sh_portchk_add_to_list (IPPROTO_TCP, 8000, &haddr_local, NULL, SH_PORT_REQ, SH_PORT_UNKN);
1870 sh_portchk_add_to_list (IPPROTO_TCP, 8001, &haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1871 sh_portchk_add_to_list (IPPROTO_TCP, 8002, &haddr_local, NULL, SH_PORT_REQ, SH_PORT_UNKN);
1872 sh_portchk_add_to_list (IPPROTO_TCP, 8003, &haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1873 sh_portchk_add_to_list (IPPROTO_TCP, 8004, &haddr_local, NULL, SH_PORT_IGN, SH_PORT_UNKN);
1874 sh_portchk_add_to_list (IPPROTO_TCP, -1, &haddr_local, "foo1", SH_PORT_NOT, SH_PORT_UNKN);
1875 sh_portchk_add_to_list (IPPROTO_TCP, -1, &haddr_local, "foo2", SH_PORT_REQ, SH_PORT_UNKN);
1876 sh_portchk_add_to_list (IPPROTO_TCP, -1, &haddr_local, "foo3", SH_PORT_NOT, SH_PORT_UNKN);
1877 sh_portchk_add_to_list (IPPROTO_TCP, -1, &haddr_local, "foo4", SH_PORT_REQ, SH_PORT_UNKN);
1878 sh_portchk_add_to_list (IPPROTO_TCP, -1, &haddr_local, "foo5", SH_PORT_IGN, SH_PORT_UNKN);
1879
1880 sh_portchk_check_list (&portlist_tcp, IPPROTO_TCP, SH_PORT_NOREPT);
1881
1882 CuAssertPtrNotNull(tc, portlist_tcp);
1883
1884 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, &haddr_local, NULL);
1885 CuAssertPtrNotNull(tc, portent);
1886
1887 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8001, &haddr_local, NULL);
1888 CuAssertTrue(tc, NULL == portent);
1889
1890 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8002, &haddr_local, NULL);
1891 CuAssertPtrNotNull(tc, portent);
1892
1893 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8003, &haddr_local, NULL);
1894 CuAssertTrue(tc, NULL == portent);
1895
1896 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8004, &haddr_local, NULL);
1897 CuAssertPtrNotNull(tc, portent);
1898
1899 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, &haddr_local, "foo1");
1900 CuAssertTrue(tc, NULL == portent);
1901
1902 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, &haddr_local, "foo2");
1903 CuAssertPtrNotNull(tc, portent);
1904 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo2"));
1905
1906 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, &haddr_local, "foo3");
1907 CuAssertTrue(tc, NULL == portent);
1908
1909 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, &haddr_local, "foo4");
1910 CuAssertPtrNotNull(tc, portent);
1911 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo4"));
1912
1913 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, &haddr_local, "foo5");
1914 CuAssertPtrNotNull(tc, portent);
1915 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo5"));
1916
1917 CuAssertTrue(tc, 0 == sh_portchk_blacklist(666, &haddr_local, IPPROTO_TCP));
1918 CuAssertTrue(tc, 0 != sh_portchk_blacklist(666, &haddr_local, IPPROTO_TCP));
1919 CuAssertTrue(tc, 0 == sh_portchk_blacklist(667, &haddr_local, IPPROTO_TCP));
1920 CuAssertTrue(tc, 0 == sh_portchk_blacklist(668, &haddr_local, IPPROTO_TCP));
1921 CuAssertTrue(tc, 0 == sh_portchk_blacklist(666, &haddr_local, IPPROTO_UDP));
1922 CuAssertTrue(tc, 0 != sh_portchk_blacklist(666, &haddr_local, IPPROTO_UDP));
1923 CuAssertTrue(tc, 0 == sh_portchk_blacklist(667, &haddr_local, IPPROTO_UDP));
1924 CuAssertTrue(tc, 0 == sh_portchk_blacklist(668, &haddr_local, IPPROTO_UDP));
1925
1926 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(668, &haddr_local, IPPROTO_UDP));
1927 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(667, &haddr_local, IPPROTO_UDP));
1928 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(666, &haddr_local, IPPROTO_UDP));
1929 CuAssertTrue(tc, 0 == sh_portchk_is_blacklisted(665, &haddr_local, IPPROTO_UDP));
1930
1931 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(668, &haddr_local, IPPROTO_TCP));
1932 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(667, &haddr_local, IPPROTO_TCP));
1933 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(666, &haddr_local, IPPROTO_TCP));
1934 CuAssertTrue(tc, 0 == sh_portchk_is_blacklisted(665, &haddr_local, IPPROTO_TCP));
1935#else
1936 (void) tc; /* fix compiler warning */
1937#endif
1938 return;
1939}
1940#endif
1941
1942#ifdef TEST_ONLY
1943
1944void usage (char * pname)
1945{
1946 printf ("%s [-r|--required interface:portlist][-o|--optional interface:portlist][--no-udp][-d|--debug] hostname\n\n", pname);
1947 printf (" Check local host for open ports; Version %s\n\n", PORTCHK_VERSION);
1948 printf (" Interface: Numeric address for an interface, e.g. 127.0.0.1\n");
1949 printf (" Portlist: List of ports or services, e.g. 22/tcp,nfs/udp,nlockmgr/udp\n");
1950 printf (" required -> must be open\n");
1951 printf (" optional -> may be open or closed\n");
1952 printf (" RPC services must be specified with service **name**, others with **port number**\n\n");
1953 printf (" Example:\n");
1954 printf (" %s --required 192.168.1.2:22/tcp,nfs/udp,nlockmgr/udp\n\n", pname);
1955 return;
1956}
1957
1958int main(int argc, char *argv[])
1959{
1960 char * pname = argv[0];
1961
1962
1963 /*
1964 test_lists();
1965
1966 portlist_tcp = sh_portchk_kill_list (portlist_tcp);
1967 portlist_udp = sh_portchk_kill_list (portlist_udp);
1968 */
1969
1970 /* sh_portchk_add_required ("127.0.0.1 : nlockmgr/tcp, 5308/tcp, nfs/tcp"); */
1971
1972 while (argc > 1 && argv[1][0] == '-')
1973 {
1974 if (0 == strcmp(argv[1], "--help") || 0 == strcmp(argv[1], "-h"))
1975 {
1976 usage(pname);
1977 exit (0);
1978 }
1979 else if (0 == strcmp(argv[1], "--required") || 0 == strcmp(argv[1], "-r"))
1980 {
1981 if (argc < 3)
1982 {
1983 usage(pname);
1984 exit (1);
1985 }
1986 sh_portchk_add_required (argv[2]);
1987 --argc; ++argv;
1988 }
1989 else if (0 == strcmp(argv[1], "--optional") || 0 == strcmp(argv[1], "-o"))
1990 {
1991 if (argc < 3)
1992 {
1993 usage(pname);
1994 exit (1);
1995 }
1996 sh_portchk_add_optional (argv[2]);
1997 --argc; ++argv;
1998 }
1999 else if (0 == strcmp(argv[1], "--no-udp"))
2000 {
2001 sh_portchk_check_udp = 0;
2002 }
2003 else if (0 == strcmp(argv[1], "--debug") || 0 == strcmp(argv[1], "-d"))
2004 {
2005 portchk_debug = 1;
2006 }
2007 else
2008 {
2009 usage(pname);
2010 exit (1);
2011 }
2012 --argc; ++argv;
2013 }
2014
2015 if (argc < 2)
2016 {
2017 usage(pname);
2018 exit (1);
2019 }
2020
2021 portchk_hostname = argv[1];
2022
2023 if (0 != sh_portchk_init ())
2024 {
2025 usage(pname);
2026 exit (1);
2027 }
2028
2029 sh_portchk_check();
2030
2031 return 0;
2032}
2033#endif
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