source: trunk/src/sh_portcheck.c@ 236

Last change on this file since 236 was 235, checked in by katerina, 15 years ago

Fix for potential deadlock when calling external programm (ticket #155).
  • Property svn:executable set to *
File size: 47.1 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#define SH_PORT_BLACKLIST 4
83
84#define SH_PORT_MISS 0
85#define SH_PORT_ISOK 1
86#define SH_PORT_UNKN 2
87
88#define SH_PORT_NOREPT 0
89#define SH_PORT_REPORT 1
90
91#define SH_PROTO_TCP 0
92#define SH_PROTO_UDP 1
93#define SH_PROTO_STR(a) (((a) == IPPROTO_TCP) ? _("tcp") : _("udp"))
94
95struct sh_portentry {
96 int port;
97 char interface[SH_INTERFACE_SIZE];
98 char * service;
99 char * error;
100 int flag; /* required or not */
101 int status; /* missing or not */
102 struct sh_portentry * next;
103};
104
105static struct sh_portentry * portlist_tcp = NULL;
106static struct sh_portentry * portlist_udp = NULL;
107
108struct sh_port {
109 int port;
110 struct in_addr haddr;
111 struct sh_port * next;
112};
113
114static struct sh_port * blacklist_tcp = NULL;
115static struct sh_port * blacklist_udp = NULL;
116
117#define SH_PORTCHK_INTERVAL 300
118
119static int sh_portchk_check_udp = 1;
120static int sh_portchk_active = 1;
121static int sh_portchk_interval = SH_PORTCHK_INTERVAL;
122#if !defined(TEST_ONLY)
123
124#define FIL__ _("sh_portcheck.c")
125#include "samhain.h"
126#include "sh_error.h"
127#include "sh_mem.h"
128#include "sh_calls.h"
129#include "sh_utils.h"
130#include "sh_modules.h"
131#define SH_NEED_GETHOSTBYXXX
132#include "sh_static.h"
133#include "sh_pthread.h"
134
135SH_MUTEX_STATIC(mutex_port_check, PTHREAD_MUTEX_INITIALIZER);
136
137static int sh_portchk_severity = SH_ERR_SEVERE;
138
139extern char * sh_port2proc_query(int proto, struct in_addr * saddr, int sport,
140 unsigned long * pid, char * user, size_t userlen);
141extern int sh_port2proc_prepare();
142extern void sh_port2proc_finish();
143
144#endif
145
146/* Exported interface to add ignoreable ports as 'iface:portlist'
147 */
148static int sh_portchk_add_ignore (const char * str);
149
150/* Exported interface to add required ports as 'iface:portlist'
151 */
152static int sh_portchk_add_required (const char * str);
153
154/* Exported interface to add optional ports as 'iface:portlist'
155 */
156static int sh_portchk_add_optional (const char * str);
157
158/* Exported interface to add blacklisted ports as 'iface:portlist'
159 */
160static int sh_portchk_add_blacklist (const char * str);
161
162/* Exported interface to add an ethernet interface
163 */
164static int sh_portchk_add_interface (const char * str);
165
166/* verify whether port/interface is blacklisted (do not check)
167 */
168static int sh_portchk_is_blacklisted(int port, struct in_addr haddr, int proto);
169
170#ifndef TEST_ONLY
171
172static int sh_portchk_set_interval (const char * c)
173{
174 int retval = 0;
175 long val;
176
177 SL_ENTER(_("sh_portchk_set_interval"));
178 val = strtol (c, (char **)NULL, 10);
179 if (val <= 0)
180 {
181 SH_MUTEX_LOCK(mutex_thread_nolog);
182 sh_error_handle ((-1), FIL__, __LINE__, EINVAL, MSG_EINVALS,
183 _("port check interval"), c);
184 SH_MUTEX_UNLOCK(mutex_thread_nolog);
185 retval = -1;
186 }
187
188 sh_portchk_interval = (time_t) val;
189 SL_RETURN(0, _("sh_portchk_set_interval"));
190}
191
192
193static int sh_portchk_set_active (const char * str)
194{
195 return sh_util_flagval(str, &sh_portchk_active);
196}
197
198static int sh_portchk_set_udp (const char * str)
199{
200 return sh_util_flagval(str, &sh_portchk_check_udp);
201}
202
203static int sh_portchk_set_severity (const char * str)
204{
205 char tmp[32];
206 tmp[0] = '='; tmp[1] = '\0';
207 sl_strlcat (tmp, str, 32);
208 return sh_error_set_level (tmp, &sh_portchk_severity);
209}
210
211sh_rconf sh_portchk_table[] = {
212 {
213 N_("severityportcheck"),
214 sh_portchk_set_severity,
215 },
216 {
217 N_("portcheckrequired"),
218 sh_portchk_add_required,
219 },
220 {
221 N_("portcheckoptional"),
222 sh_portchk_add_optional,
223 },
224 {
225 N_("portcheckignore"),
226 sh_portchk_add_ignore,
227 },
228 {
229 N_("portcheckskip"),
230 sh_portchk_add_blacklist,
231 },
232 {
233 N_("portcheckactive"),
234 sh_portchk_set_active,
235 },
236 {
237 N_("portcheckinterface"),
238 sh_portchk_add_interface,
239 },
240 {
241 N_("portcheckinterval"),
242 sh_portchk_set_interval,
243 },
244 {
245 N_("portcheckudp"),
246 sh_portchk_set_udp,
247 },
248 {
249 NULL,
250 NULL
251 }
252};
253
254#endif
255
256/* Interface to initialize port check
257 */
258int sh_portchk_init (struct mod_type * arg);
259
260/* Interface to reset port check
261 */
262int sh_portchk_reset (void);
263
264/* Interface to run port check
265 */
266int sh_portchk_check (void);
267
268
269static char * check_services (int port, int proto);
270
271#ifdef TEST_ONLY
272
273static int portchk_debug = 0;
274#define SH_ALLOC malloc
275#define SH_FREE free
276#define sh_util_strdup strdup
277#define sl_strlcpy strncpy
278#define _(a) a
279
280#else
281
282static int portchk_debug = 0;
283
284#endif
285
286static char * sh_getrpcbynumber (int number, char * buf, size_t len)
287{
288 FILE * fp;
289
290 if (NULL != (fp = fopen(_("/etc/rpc"), "r")))
291 {
292 sh_string * s = sh_string_new(0);
293 while (0 < sh_string_read(s, fp, 1024))
294 {
295 char * p = sh_string_str(s);
296 while (*p && (*p == ' ' || *p == '\t')) ++p; /* skip whitespace */
297 if (*p == '\0' || *p == '#')
298 continue; /* skip comment */
299 else
300 {
301 size_t lengths[3];
302 unsigned int fields = 3;
303 char * q = sh_string_str(s);
304 char ** splits = split_array_ws(q, &fields, lengths);
305
306 if (fields >= 2)
307 {
308 int n = atoi(splits[1]);
309 if (n == number)
310 {
311 sl_strlcpy(buf, splits[0], len);
312 SH_FREE(splits);
313 sh_string_destroy(&s);
314 fclose(fp);
315 return buf;
316 }
317 }
318 SH_FREE(splits);
319 }
320 }
321 sh_string_destroy(&s);
322 fclose(fp);
323 }
324 return NULL;
325}
326
327static char * sh_getservbyport (int port, const char * proto_in, char * buf, size_t len)
328{
329 FILE * fp;
330 char proto[8];
331
332 sl_strlcpy(proto, proto_in, sizeof(proto));
333
334 if (NULL != (fp = fopen(_("/etc/services"), "r")))
335 {
336 sh_string * s = sh_string_new(0);
337 while (0 < sh_string_read(s, fp, 1024))
338 {
339 char * p = sh_string_str(s);
340 while (*p && (*p == ' ' || *p == '\t')) ++p; /* skip whitespace */
341 if (*p == '\0' || *p == '#')
342 continue; /* skip comment */
343 else
344 {
345 size_t lengths[3];
346 unsigned int fields = 3;
347 char * q = sh_string_str(s);
348 char ** splits = split_array_ws(q, &fields, lengths);
349
350 if (fields >= 2)
351 {
352 char * end;
353 long n = strtol(splits[1], &end, 10);
354 if (n == port && end && (*end == '/' || *end == ','))
355 {
356 ++end;
357 if (0 == strcmp(end, proto))
358 {
359 sl_strlcpy(buf, splits[0], len);
360 SH_FREE(splits);
361 sh_string_destroy(&s);
362 fclose(fp);
363 return buf;
364 }
365 }
366 }
367 SH_FREE(splits);
368 }
369 }
370 sh_string_destroy(&s);
371 fclose(fp);
372 }
373 return NULL;
374}
375
376static void sh_portchk_add_to_list (int proto,
377 int port, struct in_addr haddr,
378 char * service,
379 int flag, int status)
380{
381 struct sh_portentry * new = SH_ALLOC (sizeof(struct sh_portentry));
382
383 if (portchk_debug)
384 fprintf(stderr, _("add to list: port %d/%s %d %d (%s)\n"),
385 port, SH_PROTO_STR(proto), flag, status, service ? service : _("undef"));
386
387 new->port = port;
388 sl_strlcpy (new->interface, inet_ntoa(haddr), SH_INTERFACE_SIZE);
389 new->status = status;
390 new->flag = flag;
391
392 new->error = NULL;
393
394 if (service)
395 new->service = sh_util_strdup (service);
396 else
397 new->service = NULL;
398 if (proto == IPPROTO_TCP)
399 {
400 new->next = portlist_tcp;
401 portlist_tcp = new;
402 }
403 else
404 {
405 new->next = portlist_udp;
406 portlist_udp = new;
407 }
408 return;
409}
410
411/* Reset the list by setting all entries to UNKN.
412 * In the next cycle we will check, and set found ports to ISOK.
413 * Thereafter, we check for entries that are still UNKN.
414 */
415static void sh_portchk_reset_lists (void)
416{
417 struct sh_portentry * portlist;
418
419 portlist = portlist_tcp;
420 while (portlist)
421 {
422 if (portlist->status != SH_PORT_MISS)
423 portlist->status = SH_PORT_UNKN;
424 portlist = portlist->next;
425 }
426 portlist = portlist_udp;
427 while (portlist)
428 {
429 if (portlist->status != SH_PORT_MISS)
430 portlist->status = SH_PORT_UNKN;
431 portlist = portlist->next;
432 }
433 return;
434}
435
436static struct sh_portentry * sh_portchk_kill_list (struct sh_portentry * head)
437{
438 if (head)
439 {
440 if (head->next)
441 sh_portchk_kill_list (head->next);
442
443 if (head->service)
444 SH_FREE(head->service);
445 SH_FREE(head);
446 }
447 return NULL;
448}
449
450static struct sh_port * sh_portchk_kill_blacklist (struct sh_port * head)
451{
452 if (head)
453 {
454 if (head->next)
455 sh_portchk_kill_blacklist (head->next);
456
457 SH_FREE(head);
458 }
459 return NULL;
460}
461
462/* These variables are not used anywhere. They only exist
463 * to assign &pre, &ptr to them, which keeps gcc from
464 * putting it into a register, and avoids the 'clobbered
465 * by longjmp' warning. And no, 'volatile' proved insufficient.
466 */
467static void * sh_dummy_pre = NULL;
468static void * sh_dummy_ptr = NULL;
469
470/* check the list of open ports for any that are marked as UNKN
471 */
472static void sh_portchk_check_list (struct sh_portentry ** head, int proto, int report)
473{
474 struct sh_portentry * ptr = *head;
475 struct sh_portentry * pre = *head;
476 char errbuf[256];
477
478 /* Take the address to keep gcc from putting them into registers.
479 * Avoids the 'clobbered by longjmp' warning.
480 */
481 sh_dummy_pre = (void*) &pre;
482 sh_dummy_ptr = (void*) &ptr;
483
484 while (ptr)
485 {
486 if (portchk_debug && report)
487 fprintf(stderr, _("check list: port %d/%s %d %d\n"),
488 ptr->port, SH_PROTO_STR(proto), ptr->flag, ptr->status);
489
490 if (ptr->status == SH_PORT_UNKN)
491 {
492 /* Don't report missing ports that are marked as optional
493 */
494 if (ptr->flag != SH_PORT_OPT && ptr->flag != SH_PORT_IGN)
495 {
496 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s)"),
497 ptr->interface, ptr->port, SH_PROTO_STR(proto),
498 ptr->service ? ptr->service : check_services(ptr->port, proto));
499#ifdef TEST_ONLY
500 if (report == SH_PORT_REPORT)
501 fprintf(stderr, _("%s\n"), errbuf);
502#else
503 if (report == SH_PORT_REPORT)
504 {
505 SH_MUTEX_LOCK(mutex_thread_nolog);
506 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
507 MSG_PORT_MISS, errbuf);
508 SH_MUTEX_UNLOCK(mutex_thread_nolog);
509 }
510#endif
511 }
512
513 ptr->status = SH_PORT_MISS;
514
515 if ((ptr->flag != SH_PORT_REQ) && (ptr->flag != SH_PORT_OPT) && (ptr->flag != SH_PORT_IGN))
516 {
517 if (portchk_debug && report)
518 fprintf(stderr, _("removing: port %d/%s %d %d\n"),
519 ptr->port, SH_PROTO_STR(proto), ptr->flag, ptr->status);
520
521 if (ptr == *head)
522 {
523 *head = ptr->next;
524 if (ptr->service)
525 SH_FREE(ptr->service);
526 SH_FREE(ptr);
527 ptr = *head;
528 pre = *head;
529 continue;
530 }
531 else if (ptr->next == NULL)
532 {
533 pre->next = NULL;
534 if (ptr->service)
535 SH_FREE(ptr->service);
536 SH_FREE(ptr);
537 return;
538 }
539 else
540 {
541 pre->next = ptr->next;
542 if (ptr->service)
543 SH_FREE(ptr->service);
544 SH_FREE(ptr);
545 ptr = pre->next;
546 continue;
547 }
548 }
549 }
550 pre = ptr;
551 ptr = ptr->next;
552 }
553 return;
554}
555
556
557static struct sh_portentry * sh_portchk_get_from_list (int proto, int port,
558 struct in_addr haddr, char * service)
559{
560 struct sh_portentry * portlist;
561 char iface_all[8];
562
563 sl_strlcpy (iface_all, _("0.0.0.0"), sizeof(iface_all));
564
565 if (proto == IPPROTO_TCP)
566 portlist = portlist_tcp;
567 else
568 portlist = portlist_udp;
569
570 if (service)
571 {
572 while (portlist)
573 {
574 if (portlist->service &&
575 0 == strcmp(service, portlist->service) &&
576 (0 == strcmp(portlist->interface, inet_ntoa(haddr)) ||
577 0 == strcmp(portlist->interface, iface_all)))
578 return portlist;
579 portlist = portlist->next;
580 }
581 }
582 else
583 {
584 while (portlist)
585 {
586 if (port == portlist->port &&
587 (0 == strcmp(portlist->interface, inet_ntoa(haddr)) ||
588 0 == strcmp(portlist->interface, iface_all)))
589 return portlist;
590 portlist = portlist->next;
591 }
592 }
593 return NULL;
594}
595
596
597static void sh_portchk_cmp_to_list (int proto, int port, struct in_addr haddr, char * service)
598{
599 struct sh_portentry * portent;
600 char errbuf[256];
601
602
603 portent = sh_portchk_get_from_list (proto, port, haddr, service);
604
605 if (service)
606 {
607 if (!portent)
608 {
609 char * path;
610 unsigned long qpid;
611 char user[USER_MAX];
612
613 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s)"),
614 inet_ntoa(haddr), port, SH_PROTO_STR(proto), service);
615#ifdef TEST_ONLY
616 fprintf(stderr, _("open port: %s:%d/%s (%s)\n"),
617 inet_ntoa(haddr), port, SH_PROTO_STR(proto), service);
618#else
619 path = sh_port2proc_query(proto, &haddr, port, &qpid, user, sizeof(user));
620 SH_MUTEX_LOCK(mutex_thread_nolog);
621 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
622 MSG_PORT_NEW, errbuf, path, qpid, user);
623 SH_MUTEX_UNLOCK(mutex_thread_nolog);
624 SH_FREE(path);
625#endif
626 /*
627 * was not there, thus it is not in 'required' or 'optional' list
628 */
629 sh_portchk_add_to_list (proto, port, haddr, service, SH_PORT_NOT, SH_PORT_ISOK);
630 }
631 else if (portent->status == SH_PORT_MISS && portent->flag != SH_PORT_IGN)
632 {
633 char * path;
634 unsigned long qpid;
635 char user[USER_MAX];
636
637 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s), was %d/%s"),
638 inet_ntoa(haddr), port, SH_PROTO_STR(proto), service, portent->port, SH_PROTO_STR(proto));
639#ifdef TEST_ONLY
640 fprintf(stderr, _("service: %s\n"), errbuf);
641#else
642 path = sh_port2proc_query(proto, &haddr, port, &qpid, user, sizeof(user));
643 SH_MUTEX_LOCK(mutex_thread_nolog);
644 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
645 MSG_PORT_RESTART, errbuf, path, qpid, user);
646 SH_MUTEX_UNLOCK(mutex_thread_nolog);
647 SH_FREE(path);
648#endif
649
650 portent->status = SH_PORT_ISOK;
651 }
652 else if (port != portent->port && (-1) != portent->port)
653 {
654 char * path;
655 unsigned long qpid;
656 char user[USER_MAX];
657
658 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s), was %d/%s"),
659 inet_ntoa(haddr), port, SH_PROTO_STR(proto), service, portent->port, SH_PROTO_STR(proto));
660#ifdef TEST_ONLY
661 fprintf(stderr, _("service: %s\n"), errbuf);
662#else
663 path = sh_port2proc_query(proto, &haddr, port, &qpid, user, sizeof(user));
664 SH_MUTEX_LOCK(mutex_thread_nolog);
665 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
666 MSG_PORT_NEWPORT, errbuf, path, qpid, user);
667 SH_MUTEX_UNLOCK(mutex_thread_nolog);
668 SH_FREE(path);
669#endif
670 portent->port = port;
671 portent->status = SH_PORT_ISOK;
672 }
673 else
674 {
675 portent->status = SH_PORT_ISOK;
676 }
677 }
678 else
679 {
680 if (!portent)
681 {
682 char * path;
683 unsigned long qpid;
684 char user[USER_MAX];
685
686 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s)"),
687 inet_ntoa(haddr), port, SH_PROTO_STR(proto), check_services(port, proto));
688#ifdef TEST_ONLY
689 fprintf(stderr, _("open port: %s:%d/%s (%s)\n"),
690 inet_ntoa(haddr), port, SH_PROTO_STR(proto), check_services(port, proto));
691#else
692 path = sh_port2proc_query(proto, &haddr, port, &qpid, user, sizeof(user));
693 SH_MUTEX_LOCK(mutex_thread_nolog);
694 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
695 MSG_PORT_NEW, errbuf, path, qpid, user);
696 SH_MUTEX_UNLOCK(mutex_thread_nolog);
697 SH_FREE(path);
698#endif
699
700 /* was not there, thus it is not in 'required' or 'optional' list
701 */
702 sh_portchk_add_to_list (proto, port, haddr, service, SH_PORT_NOT, SH_PORT_ISOK);
703 }
704 else if (portent->status == SH_PORT_MISS && portent->flag != SH_PORT_IGN)
705 {
706 char * path;
707 unsigned long qpid;
708 char user[USER_MAX];
709
710 snprintf (errbuf, sizeof(errbuf), _("port: %s:%d/%s (%s)"),
711 inet_ntoa(haddr), port, SH_PROTO_STR(proto), check_services(port, proto));
712#ifdef TEST_ONLY
713 fprintf(stderr, _("port : %s\n"), errbuf);
714#else
715 path = sh_port2proc_query(proto, &haddr, port, &qpid, user, sizeof(user));
716 SH_MUTEX_LOCK(mutex_thread_nolog);
717 sh_error_handle(sh_portchk_severity, FIL__, __LINE__, 0,
718 MSG_PORT_RESTART, errbuf, path, qpid, user);
719 SH_MUTEX_UNLOCK(mutex_thread_nolog);
720 SH_FREE(path);
721#endif
722
723 portent->status = SH_PORT_ISOK;
724 }
725 else
726 {
727 portent->status = SH_PORT_ISOK;
728 }
729 }
730
731 return;
732}
733
734
735/* Returns a static buffer containing the name of the service
736 * running on port <port> (from /etc/services)
737 * Returns NULL on failure
738 */
739static char * check_services (int port, int proto)
740{
741 static char buf[256];
742 char * service = sh_getservbyport(port, SH_PROTO_STR(proto), buf, sizeof(buf));
743
744 if (!service)
745 {
746 snprintf (buf, sizeof(buf), "%s",_("unknown"));
747 }
748 return buf;
749}
750
751/* Returns a static buffer containing the name of the service
752 * running on port <port> at <address> (from portmap daemon)
753 * Returns NULL on failure
754 */
755static char * check_rpc_list (int port, struct sockaddr_in * address,
756 unsigned long prot)
757{
758 struct pmaplist * head;
759 char *r;
760 static char buf[256];
761
762 head = pmap_getmaps(address);
763
764 if (head)
765 {
766 do /* while (head != NULL) */
767 {
768 if ((head->pml_map.pm_prot == prot) &&
769 (port == (int)head->pml_map.pm_port))
770 {
771 r = sh_getrpcbynumber((int)head->pml_map.pm_prog,
772 buf, sizeof(buf));
773 if (r)
774 {
775 return buf;
776 }
777 else
778 {
779 snprintf (buf, sizeof(buf), "RPC_%lu",
780 (unsigned long)head->pml_map.pm_prog);
781 return buf;
782 }
783 }
784 head = head->pml_next;
785 }
786 while (head != NULL);
787 }
788
789 return NULL;
790}
791
792static int check_port_udp_internal (int fd, int port, struct in_addr haddr)
793{
794 struct sockaddr_in sinr;
795 /* struct in_addr haddr; */
796 int retval;
797 char * p;
798 char buf[8];
799#ifndef TEST_ONLY
800 char errmsg[256];
801 int nerr;
802#endif
803 char errbuf[SH_ERRBUF_SIZE];
804
805 /* inet_aton(interface, &haddr); */
806
807 sinr.sin_family = AF_INET;
808 sinr.sin_port = htons (port);
809 sinr.sin_addr = haddr;
810
811 do {
812 retval = connect(fd, (struct sockaddr *) &sinr, sizeof(sinr));
813 } while (retval < 0 && (errno == EINTR || errno == EINPROGRESS));
814
815 if (retval == -1)
816 {
817#ifdef TEST_ONLY
818 if (portchk_debug)
819 perror(_("connect"));
820#else
821 nerr = errno;
822 sl_snprintf(errmsg, sizeof(errmsg), _("check port: %5d/udp on %15s: %s"),
823 port, inet_ntoa(haddr), sh_error_message(errno, errbuf, sizeof(errbuf)));
824 SH_MUTEX_LOCK(mutex_thread_nolog);
825 sh_error_handle((-1), FIL__, __LINE__, nerr, MSG_E_SUBGEN,
826 errmsg, _("connect"));
827 SH_MUTEX_UNLOCK(mutex_thread_nolog);
828#endif
829 }
830 else
831 {
832 do {
833 retval = send (fd, buf, 0, 0);
834 } while (retval < 0 && errno == EINTR);
835
836 if (retval == -1 && errno == ECONNREFUSED)
837 {
838 if (portchk_debug)
839 fprintf(stderr, _("check port: %5d/udp on %15s established/time_wait\n"),
840 port, inet_ntoa(haddr));
841 }
842 else
843 {
844 /* Only the second send() may catch the error
845 */
846 do {
847 retval = send (fd, buf, 0, 0);
848 } while (retval < 0 && errno == EINTR);
849
850 if (retval == -1 && errno == ECONNREFUSED)
851 {
852 if (portchk_debug)
853 fprintf(stderr, _("check port: %5d/udp on %15s established/time_wait\n"),
854 port, inet_ntoa(haddr));
855 }
856 else if (retval != -1)
857 {
858 /* Try to get service name from portmap
859 */
860 p = check_rpc_list (port, &sinr, IPPROTO_UDP);
861
862 sh_portchk_cmp_to_list (IPPROTO_UDP, port, haddr, p ? p : NULL);
863
864 /* If not an RPC service, try to get name from /etc/services
865 */
866 if (!p)
867 p = check_services(port, IPPROTO_UDP);
868
869 if (portchk_debug)
870 fprintf(stderr, _("check port: %5d/udp on %15s open %s\n"),
871 port, inet_ntoa(haddr), p);
872
873 }
874 }
875 }
876 close (fd);
877 return 0;
878}
879
880static int check_port_tcp_internal (int fd, int port, struct in_addr haddr)
881{
882 struct sockaddr_in sinr;
883 /* struct in_addr haddr; */
884 int retval;
885 int flags;
886 char * p;
887#ifndef TEST_ONLY
888 char errmsg[256];
889 int nerr;
890#endif
891 char errbuf[SH_ERRBUF_SIZE];
892
893 /* inet_aton(interface, &haddr); */
894
895 sinr.sin_family = AF_INET;
896 sinr.sin_port = htons (port);
897 sinr.sin_addr = haddr;
898
899 do {
900 retval = connect(fd, (struct sockaddr *) &sinr, sizeof(sinr));
901 } while (retval < 0 && (errno == EINTR || errno == EINPROGRESS));
902
903 if (retval == -1 && errno == ECONNREFUSED)
904 {
905 if (portchk_debug)
906 fprintf(stderr, _("check port: %5d on %15s established/time_wait\n"),
907 port, inet_ntoa(haddr));
908 }
909 else if (retval == -1)
910 {
911#ifdef TEST_ONLY
912 if (portchk_debug)
913 perror(_("connect"));
914#else
915 nerr = errno;
916 sl_snprintf(errmsg, sizeof(errmsg), _("check port: %5d/tcp on %15s: %s"),
917 port, inet_ntoa(haddr), sh_error_message(errno, errbuf, sizeof(errbuf)));
918 SH_MUTEX_LOCK(mutex_thread_nolog);
919 sh_error_handle((-1), FIL__, __LINE__, nerr, MSG_E_SUBGEN,
920 errmsg, _("connect"));
921 SH_MUTEX_UNLOCK(mutex_thread_nolog);
922#endif
923 }
924 else
925 {
926 /* Try to get service name from portmap
927 */
928 p = check_rpc_list (port, &sinr, IPPROTO_TCP);
929
930 sh_portchk_cmp_to_list (IPPROTO_TCP, port, haddr, p ? p : NULL);
931
932 /* If not an RPC service, try to get name from /etc/services
933 */
934 if (!p)
935 p = check_services(port, IPPROTO_TCP);
936
937 if (portchk_debug)
938 fprintf(stderr, _("check port: %5d on %15s open %s\n"),
939 port, inet_ntoa(haddr), p);
940
941#if !defined(O_NONBLOCK)
942#if defined(O_NDELAY)
943#define O_NONBLOCK O_NDELAY
944#else
945#define O_NONBLOCK 0
946#endif
947#endif
948
949 /* prepare to close connection gracefully
950 */
951 if (port == 22) /* ssh */
952 {
953 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
954 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
955 retval = write (fd, _("SSH-2.0-Foobar"), 14);
956 if (retval > 0) retval = write (fd, "\r\n", 2);
957 }
958 else if (port == 25) /* smtp */
959 {
960 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
961 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
962 retval = write (fd, _("QUIT"), 4);
963 if (retval > 0) retval = write (fd, "\r\n", 2);
964 }
965 else if (port == 79) /* finger */
966 {
967 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
968 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
969 retval = write (fd, "\r\n", 2);
970 }
971 else if (port == 110) /* pop3 */
972 {
973 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
974 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
975 retval = write (fd, _("QUIT"), 4);
976 if (retval > 0) retval = write (fd, "\r\n", 2);
977 }
978 else if (port == 143) /* imap */
979 {
980 flags = retry_fcntl(FIL__, __LINE__, fd, F_GETFL, 0);
981 retry_fcntl(FIL__, __LINE__, fd, F_SETFL, flags | O_NONBLOCK);
982 retval = write (fd, _("A01 LOGOUT"), 10);
983 if (retval > 0) retval = write (fd, "\r\n", 2);
984 }
985
986 if (portchk_debug && retval < 0)
987 fprintf(stderr, _("check port: error writing to port %5d\n"),
988 port);
989 }
990 close (fd);
991 return 0;
992}
993
994/* typedef uint32_t in_addr_t;
995 * struct in_addr
996 * {
997 * in_addr_t s_addr;
998 * };
999 */
1000
1001#define SH_IFACE_MAX 16
1002
1003struct portchk_interfaces {
1004 struct in_addr iface[SH_IFACE_MAX];
1005 int used;
1006};
1007
1008static struct portchk_interfaces iface_list;
1009static int iface_initialized = 0;
1010
1011#ifdef TEST_ONLY
1012static char * portchk_hostname = NULL;
1013#else
1014static char * portchk_hostname = sh.host.name;
1015#endif
1016
1017static int sh_portchk_init_internal (void)
1018{
1019 struct hostent * hent;
1020 volatile int i; /* might be clobbered by ‘longjmp’ or ‘vfork’*/
1021 char errbuf[256];
1022
1023 if (portchk_debug)
1024 fprintf(stderr, _("checking ports on: %s\n"), portchk_hostname ? portchk_hostname : _("NULL"));
1025
1026 if (!portchk_hostname)
1027 return -1;
1028
1029 if (sh_portchk_active == S_FALSE)
1030 return -1;
1031
1032 SH_MUTEX_LOCK(mutex_port_check);
1033 if (iface_initialized == 0)
1034 {
1035 iface_list.used = 0;
1036 iface_initialized = 1;
1037 }
1038
1039 SH_MUTEX_LOCK(mutex_resolv);
1040 hent = sh_gethostbyname(portchk_hostname);
1041 i = 0;
1042 while (hent && hent->h_addr_list[i] && (iface_list.used < SH_IFACE_MAX))
1043 {
1044 memcpy (&(iface_list.iface[iface_list.used].s_addr), hent->h_addr_list[i], sizeof(in_addr_t));
1045 ++iface_list.used;
1046 ++i;
1047 }
1048 SH_MUTEX_UNLOCK(mutex_resolv);
1049
1050 for (i = 0; i < iface_list.used; ++i)
1051 {
1052 sl_snprintf(errbuf, sizeof(errbuf), _("interface: %s"),
1053 inet_ntoa(iface_list.iface[i]));
1054 SH_MUTEX_LOCK(mutex_thread_nolog);
1055 sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1056 errbuf, _("sh_portchk_init"));
1057 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1058 }
1059 SH_MUTEX_UNLOCK(mutex_port_check);
1060
1061 return 0;
1062}
1063
1064int sh_portchk_init (struct mod_type * arg)
1065{
1066#ifndef HAVE_PTHREAD
1067 (void) arg;
1068#endif
1069
1070 if (sh_portchk_active == S_FALSE)
1071 return SH_MOD_FAILED;
1072 if (!portchk_hostname)
1073 return SH_MOD_FAILED;
1074
1075#ifdef HAVE_PTHREAD
1076 if (arg != NULL && arg->initval < 0 &&
1077 (sh.flag.isdaemon == S_TRUE || sh.flag.loop == S_TRUE))
1078 {
1079 if (0 == sh_pthread_create(sh_threaded_module_run, (void *)arg))
1080 return SH_MOD_THREAD;
1081 else
1082 return SH_MOD_FAILED;
1083 }
1084#endif
1085 return sh_portchk_init_internal();
1086}
1087
1088
1089
1090#if !defined(TEST_ONLY)
1091int sh_portchk_reconf (void)
1092{
1093 SH_MUTEX_LOCK(mutex_port_check);
1094 iface_initialized = 0;
1095 sh_portchk_active = 1;
1096 sh_portchk_check_udp = 1;
1097 sh_portchk_interval = SH_PORTCHK_INTERVAL;
1098
1099 portlist_udp = sh_portchk_kill_list (portlist_udp);
1100 portlist_tcp = sh_portchk_kill_list (portlist_tcp);
1101
1102 blacklist_udp = sh_portchk_kill_blacklist (blacklist_udp);
1103 blacklist_tcp = sh_portchk_kill_blacklist (blacklist_tcp);
1104 sh_port2proc_finish();
1105
1106 SH_MUTEX_UNLOCK(mutex_port_check);
1107 return 0;
1108}
1109
1110int sh_portchk_cleanup (void)
1111{
1112 return sh_portchk_reconf ();
1113}
1114
1115int sh_portchk_timer (time_t tcurrent)
1116{
1117 static time_t lastcheck = 0;
1118
1119 SL_ENTER(_("sh_portchk_timer"));
1120 if ((time_t) (tcurrent - lastcheck) >= sh_portchk_interval)
1121 {
1122 lastcheck = tcurrent;
1123 SL_RETURN((-1), _("sh_portchk_timer"));
1124 }
1125 SL_RETURN(0, _("sh_portchk_timer"));
1126}
1127#endif
1128
1129static int check_port_generic (int port, int type, int protocol)
1130{
1131 volatile int i = 0;
1132 int sock = -1;
1133 int flag = 1; /* non-zero to enable an option */
1134 struct in_addr haddr;
1135 char errbuf[SH_ERRBUF_SIZE];
1136
1137 /* Check all interfaces for this host
1138 */
1139 while (i < iface_list.used)
1140 {
1141 haddr.s_addr = iface_list.iface[i].s_addr;
1142
1143 if (0 != sh_portchk_is_blacklisted(port, haddr, protocol))
1144 {
1145 ++i; continue;
1146 }
1147
1148 if ((sock = socket(AF_INET, type, protocol)) < 0 )
1149 {
1150 ++i;
1151#ifdef TEST_ONLY
1152 if (portchk_debug)
1153 perror(_("socket"));
1154#else
1155 SH_MUTEX_LOCK(mutex_thread_nolog);
1156 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1157 sh_error_message(errno, errbuf, sizeof(errbuf)), _("socket"));
1158 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1159#endif
1160 continue;
1161 }
1162 if ( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
1163 (void *) &flag, sizeof(flag)) < 0 )
1164 {
1165 ++i;
1166#ifdef TEST_ONLY
1167 if (portchk_debug)
1168 perror(_("setsockopt"));
1169#else
1170 SH_MUTEX_LOCK(mutex_thread_nolog);
1171 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1172 sh_error_message(errno, errbuf, sizeof(errbuf)),_("setsockopt"));
1173 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1174#endif
1175 continue;
1176 }
1177
1178
1179 if (protocol == IPPROTO_TCP)
1180 check_port_tcp_internal(sock, port, haddr);
1181 else
1182 check_port_udp_internal(sock, port, haddr);
1183
1184 ++i;
1185 }
1186
1187 return 0;
1188}
1189
1190
1191
1192static int check_port_udp (int port)
1193{
1194 return check_port_generic(port, SOCK_DGRAM, IPPROTO_UDP);
1195}
1196
1197static int check_port_tcp (int port)
1198{
1199 return check_port_generic(port, SOCK_STREAM, IPPROTO_TCP);
1200}
1201
1202
1203
1204static int sh_portchk_scan_ports_generic (int min_port, int max_port_arg, int type, int protocol)
1205{
1206 /*
1207 int min_port = 1024;
1208 int max_port = 65535;
1209 */
1210
1211 volatile int port; /* might be clobbered by ‘longjmp’ or ‘vfork’*/
1212 volatile int max_port = max_port_arg;
1213 int retval;
1214 int sock = -1;
1215 int flag = 1; /* non-zero to enable an option */
1216
1217 struct sockaddr_in addr;
1218 int addrlen = sizeof(addr);
1219 char errbuf[SH_ERRBUF_SIZE];
1220
1221 if (min_port == -1)
1222 min_port = 0;
1223 if (max_port == -1)
1224 max_port = 65535;
1225
1226 for (port = min_port; port <= max_port; ++port)
1227 {
1228
1229 if ((sock = socket(AF_INET, type, protocol)) < 0 )
1230 {
1231#ifdef TEST_ONLY
1232 if (portchk_debug)
1233 perror(_("socket"));
1234#else
1235 SH_MUTEX_LOCK(mutex_thread_nolog);
1236 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1237 sh_error_message(errno, errbuf, sizeof(errbuf)), _("socket"));
1238 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1239#endif
1240 continue;
1241 }
1242 if ( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
1243 (void *) &flag, sizeof(flag)) < 0 )
1244 {
1245#ifdef TEST_ONLY
1246 if (portchk_debug)
1247 perror(_("setsockopt"));
1248#else
1249 SH_MUTEX_LOCK(mutex_thread_nolog);
1250 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1251 sh_error_message(errno, errbuf, sizeof(errbuf)),_("setsockopt"));
1252 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1253#endif
1254 continue;
1255 }
1256
1257 addr.sin_family = AF_INET;
1258 addr.sin_port = htons(port);
1259 addr.sin_addr.s_addr = INADDR_ANY;
1260
1261 retval = bind (sock, (struct sockaddr *) &addr, addrlen);
1262
1263 if (retval == 0)
1264 {
1265 /* we can bind the port, thus it is unused
1266 */
1267 close (sock);
1268 }
1269 else
1270 {
1271 if (errno == EINVAL || errno == EADDRINUSE)
1272 {
1273 /* try to connect to the port
1274 */
1275 if (protocol == IPPROTO_TCP)
1276 check_port_tcp(port);
1277 else
1278 check_port_udp(port);
1279 }
1280 else
1281 {
1282#ifdef TEST_ONLY
1283 if (portchk_debug)
1284 perror(_("bind"));
1285#else
1286 SH_MUTEX_LOCK(mutex_thread_nolog);
1287 sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
1288 sh_error_message(errno, errbuf, sizeof(errbuf)), _("bind"));
1289 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1290#endif
1291 }
1292 close (sock);
1293 }
1294 }
1295 return 0;
1296}
1297
1298static int sh_portchk_scan_ports_tcp (int min_port, int max_port)
1299{
1300 return sh_portchk_scan_ports_generic (min_port, max_port, SOCK_STREAM, IPPROTO_TCP);
1301}
1302
1303static int sh_portchk_scan_ports_udp (int min_port, int max_port)
1304{
1305 return sh_portchk_scan_ports_generic (min_port, max_port, SOCK_DGRAM, IPPROTO_UDP);
1306}
1307
1308/* Subroutine to add an interface
1309 */
1310static void * sh_dummy_str = NULL; /* fix clobbered by.. warning */
1311
1312static int sh_portchk_add_interface (const char * str)
1313{
1314 struct in_addr haddr;
1315 char errbuf[256];
1316 char buf[64];
1317
1318 sh_dummy_str = (void*) &str;
1319
1320 if (iface_initialized == 0)
1321 {
1322 iface_list.used = 0;
1323 iface_initialized = 1;
1324 }
1325
1326 do {
1327
1328 while (*str == ',' || *str == ' ' || *str == '\t') ++str;
1329
1330 if (*str)
1331 {
1332 unsigned int i = 0;
1333 while (*str && i < (sizeof(buf)-1) && *str != ',' && *str != ' ' && *str != '\t')
1334 {
1335 buf[i] = *str; ++str; ++i;
1336 }
1337 buf[i] = '\0';
1338
1339 if (0 == inet_aton(buf, &haddr))
1340 return -1;
1341
1342 if (iface_list.used == SH_IFACE_MAX)
1343 return -1;
1344
1345 sl_snprintf(errbuf, sizeof(errbuf), _("interface: %s"), inet_ntoa(haddr));
1346 SH_MUTEX_LOCK(mutex_thread_nolog);
1347 sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1348 errbuf, _("sh_portchk_add_interface"));
1349 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1350
1351 memcpy (&(iface_list.iface[iface_list.used].s_addr), &(haddr.s_addr), sizeof(in_addr_t));
1352 ++iface_list.used;
1353 }
1354 } while (*str);
1355
1356 return 0;
1357}
1358
1359/* verify whether port/interface is blacklisted (do not check)
1360 */
1361static int sh_portchk_is_blacklisted(int port, struct in_addr haddr, int proto)
1362{
1363 struct sh_port * head;
1364
1365 if (proto == IPPROTO_TCP)
1366 head = blacklist_tcp;
1367 else
1368 head = blacklist_udp;
1369
1370 while (head)
1371 {
1372 if (head->port == port)
1373 {
1374 if ((head->haddr.s_addr == 0) || (head->haddr.s_addr == haddr.s_addr))
1375 return 1;
1376 else
1377 return 0;
1378 }
1379 head = head->next;
1380 }
1381 return 0;
1382}
1383
1384
1385static int sh_portchk_blacklist(int port, struct in_addr haddr, int proto)
1386{
1387 struct sh_port * black;
1388 struct sh_port * head;
1389
1390 if (proto == IPPROTO_TCP)
1391 head = blacklist_tcp;
1392 else
1393 head = blacklist_udp;
1394
1395 black = head;
1396
1397 while (black)
1398 {
1399 if (black->port == port && head->haddr.s_addr == haddr.s_addr)
1400 return -1;
1401 black = black->next;
1402 }
1403 black = SH_ALLOC (sizeof(struct sh_port));
1404 black->port = port;
1405 black->haddr.s_addr = haddr.s_addr;
1406 black->next = head;
1407
1408 if (proto == IPPROTO_TCP)
1409 blacklist_tcp = black;
1410 else
1411 blacklist_udp = black;
1412 return 0;
1413}
1414
1415
1416/* Subroutine to add a required or optional port/service
1417 */
1418static int sh_portchk_add_required_port_generic (char * service, char * interface, int type)
1419{
1420 char buf[256];
1421 int proto;
1422 char * p;
1423 char * endptr;
1424 unsigned long int port;
1425 struct in_addr haddr;
1426 struct sh_portentry * portent;
1427
1428 if (0 == inet_aton(interface, &haddr))
1429 return -1;
1430
1431 sl_strlcpy (buf, service, sizeof(buf));
1432
1433 p = strchr(buf, '/');
1434 if (!p)
1435 return -1;
1436 if (0 == strcmp(p, _("/tcp")))
1437 proto = IPPROTO_TCP;
1438 else if (0 == strcmp(p, _("/udp")))
1439 proto = IPPROTO_UDP;
1440 else
1441 return -1;
1442
1443 *p = '\0';
1444 port = strtoul(buf, &endptr, 0);
1445
1446 /* Blacklisted ports
1447 */
1448 if (*endptr == '\0' && port <= 65535 && type == SH_PORT_BLACKLIST)
1449 return (sh_portchk_blacklist(port, haddr, proto));
1450
1451 if (*endptr != '\0')
1452 {
1453 portent = sh_portchk_get_from_list (proto, -1, haddr, buf);
1454 if (!portent)
1455 sh_portchk_add_to_list (proto, -1, haddr, buf, type, SH_PORT_UNKN);
1456 else
1457 {
1458#ifdef TEST_ONLY
1459 fprintf(stderr, "** WARNING: duplicate port definition %s/%s\n", buf, SH_PROTO_STR(proto));
1460#else
1461 SH_MUTEX_LOCK(mutex_thread_nolog);
1462 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1463 _("duplicate port definition"), _("sh_portchk_add_required_port_generic"));
1464 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1465#endif
1466 return -1;
1467 }
1468 }
1469 else if (port <= 65535)
1470 {
1471 portent = sh_portchk_get_from_list (proto, port, haddr, NULL);
1472 if (!portent)
1473 sh_portchk_add_to_list (proto, port, haddr, NULL, type, SH_PORT_UNKN);
1474 else
1475 {
1476#ifdef TEST_ONLY
1477 fprintf(stderr, "** WARNING: duplicate port definition %lu/%s\n", port, SH_PROTO_STR(proto));
1478#else
1479 SH_MUTEX_LOCK(mutex_thread_nolog);
1480 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1481 _("duplicate port definition"), _("sh_portchk_add_required_port_generic"));
1482 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1483#endif
1484 return -1;
1485 }
1486 }
1487 else
1488 return -1;
1489
1490 return 0;
1491}
1492
1493/* Internal interface to add required or optional ports as 'iface:portlist'
1494 */
1495static int sh_portchk_add_required_generic (const char * str, int type)
1496{
1497 size_t len;
1498 size_t ll = 0;
1499 int status;
1500
1501 char * interface = NULL;
1502 char * list;
1503 char * p;
1504#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
1505 char * saveptr;
1506#endif
1507
1508 if (!str)
1509 return -1;
1510
1511 if (strchr(str, ':'))
1512 {
1513 len = strlen(str);
1514 for (ll = 0; ll < len; ++ll)
1515 {
1516 if (str[ll] == ':' || str[ll] == ' ' || str[ll] == '\t')
1517 {
1518 interface = SH_ALLOC(ll+1);
1519 sl_strlcpy(interface, str, ll+1);
1520 interface[ll] = '\0';
1521 while (str[ll] == ':' || str[ll] == ' ' || str[ll] == '\t')
1522 ++ll;
1523 break;
1524 }
1525 }
1526 }
1527 else
1528 {
1529 interface = SH_ALLOC(8);
1530 sl_strlcpy(interface, _("0.0.0.0"), 8);
1531 interface[7] = '\0';
1532 while (str[ll] == ' ' || str[ll] == '\t')
1533 ++ll;
1534 }
1535
1536 if (!interface)
1537 return -1;
1538
1539 if (str[ll] == '\0')
1540 {
1541 SH_FREE(interface);
1542 return -1;
1543 }
1544
1545 if (portchk_debug)
1546 fprintf(stderr, "add ports for interface: %s\n", interface);
1547
1548 list = sh_util_strdup(&str[ll]);
1549#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
1550 p = strtok_r (list, " ,\t", &saveptr);
1551#else
1552 p = strtok (list, " ,\t");
1553#endif
1554 if (!p)
1555 {
1556 SH_FREE(interface);
1557 SH_FREE(list);
1558 return -1;
1559 }
1560 while (p)
1561 {
1562 status = sh_portchk_add_required_port_generic (p, interface, type);
1563
1564 if (-1 == status)
1565 {
1566 SH_FREE(interface);
1567 SH_FREE(list);
1568 return -1;
1569 }
1570#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
1571 p = strtok_r (NULL, " ,\t", &saveptr);
1572#else
1573 p = strtok (NULL, " ,\t");
1574#endif
1575 }
1576 SH_FREE(interface);
1577 SH_FREE(list);
1578 return 0;
1579}
1580
1581/* User interface to add required ports as 'iface:portlist'
1582 */
1583static int sh_portchk_add_required (const char * str)
1584{
1585 return sh_portchk_add_required_generic (str, SH_PORT_REQ);
1586}
1587
1588/* User interface to add optional ports as 'iface:portlist'
1589 */
1590static int sh_portchk_add_optional (const char * str)
1591{
1592 return sh_portchk_add_required_generic (str, SH_PORT_OPT);
1593}
1594
1595/* User interface to add ignoreable ports as 'iface:portlist'
1596 */
1597static int sh_portchk_add_ignore (const char * str)
1598{
1599 return sh_portchk_add_required_generic (str, SH_PORT_IGN);
1600}
1601
1602/* User interface to add ports that should not be checked as 'iface:portlist'
1603 */
1604static int sh_portchk_add_blacklist (const char * str)
1605{
1606 return sh_portchk_add_required_generic (str, SH_PORT_BLACKLIST);
1607}
1608
1609/* Interface to run port check
1610 */
1611int sh_portchk_check ()
1612{
1613 volatile int min_port;
1614
1615 SH_MUTEX_LOCK(mutex_port_check);
1616
1617 min_port = 0;
1618
1619 if (sh_portchk_active != S_FALSE)
1620 {
1621 sh_portchk_reset_lists();
1622 if (0 != geteuid())
1623 {
1624 min_port = 1024;
1625#ifdef TEST_ONLY
1626 fprintf(stderr, "** WARNING not scanning ports < 1024\n");
1627#else
1628 SH_MUTEX_LOCK(mutex_thread_nolog);
1629 sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, 0, MSG_E_SUBGEN,
1630 _("not scanning ports below 1024"), _("sh_portchk_check"));
1631 SH_MUTEX_UNLOCK(mutex_thread_nolog);
1632#endif
1633 }
1634
1635 sh_port2proc_prepare();
1636
1637 if (sh_portchk_check_udp == 1)
1638 sh_portchk_scan_ports_udp(min_port, -1);
1639 sh_portchk_scan_ports_tcp(min_port, -1);
1640
1641
1642 sh_portchk_check_list (&portlist_tcp, IPPROTO_TCP, SH_PORT_REPORT);
1643 if (sh_portchk_check_udp == 1)
1644 sh_portchk_check_list (&portlist_udp, IPPROTO_UDP, SH_PORT_REPORT);
1645
1646 }
1647 SH_MUTEX_UNLOCK(mutex_port_check);
1648 return 0;
1649}
1650#endif
1651
1652#ifdef SH_CUTEST
1653#include "CuTest.h"
1654
1655void Test_portcheck_lists (CuTest *tc)
1656{
1657#if defined(SH_USE_PORTCHECK) && (defined(SH_WITH_CLIENT) || defined(SH_STANDALONE))
1658 struct in_addr haddr_local;
1659 struct sh_portentry * portent;
1660 char buf[256];
1661 char * p;
1662
1663 p = sh_getrpcbynumber(0, buf, sizeof(buf));
1664 CuAssertTrue(tc, p == NULL);
1665
1666 p = sh_getrpcbynumber(100000, buf, sizeof(buf));
1667 CuAssertPtrNotNull(tc, p);
1668 CuAssertTrue(tc, (0 == strcmp(p, "portmapper") || 0 == strcmp(p, "rpcbind")));
1669 CuAssertTrue(tc, (0 == strcmp(buf, "portmapper") || 0 == strcmp(p, "rpcbind")));
1670
1671 p = sh_getrpcbynumber(100007, buf, sizeof(buf));
1672 CuAssertPtrNotNull(tc, p);
1673 CuAssertTrue(tc, 0 == strcmp(p, "ypbind"));
1674 CuAssertTrue(tc, 0 == strcmp(buf, "ypbind"));
1675
1676 p = sh_getservbyport(0, SH_PROTO_STR(IPPROTO_TCP), buf, sizeof(buf));
1677 CuAssertTrue(tc, p == NULL);
1678
1679 p = sh_getservbyport(22, SH_PROTO_STR(IPPROTO_TCP), buf, sizeof(buf));
1680 CuAssertPtrNotNull(tc, p);
1681 CuAssertTrue(tc, 0 == strcmp(p, "ssh"));
1682 CuAssertTrue(tc, 0 == strcmp(buf, "ssh"));
1683
1684 p = sh_getservbyport(13, SH_PROTO_STR(IPPROTO_UDP), buf, sizeof(buf));
1685 CuAssertPtrNotNull(tc, p);
1686 CuAssertTrue(tc, 0 == strcmp(p, "daytime"));
1687 CuAssertTrue(tc, 0 == strcmp(buf, "daytime"));
1688
1689 CuAssertTrue(tc, 0 != inet_aton("127.0.0.1", &haddr_local));
1690
1691 sh_portchk_add_to_list (IPPROTO_TCP, 8000, haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1692
1693 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, haddr_local, NULL);
1694 CuAssertPtrNotNull(tc, portent);
1695
1696 CuAssertTrue(tc, portent->port == 8000);
1697 CuAssertTrue(tc, 0 == strcmp("127.0.0.1", portent->interface));
1698 CuAssertTrue(tc, portent->status == SH_PORT_UNKN);
1699 CuAssertTrue(tc, portent->flag == SH_PORT_NOT);
1700
1701 sh_portchk_check_list (&portlist_tcp, IPPROTO_TCP, SH_PORT_NOREPT);
1702
1703 CuAssertTrue(tc, NULL == portlist_tcp);
1704
1705 sh_portchk_add_to_list (IPPROTO_TCP, 8000, haddr_local, NULL, SH_PORT_REQ, SH_PORT_UNKN);
1706 sh_portchk_add_to_list (IPPROTO_TCP, 8001, haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1707 sh_portchk_add_to_list (IPPROTO_TCP, 8002, haddr_local, NULL, SH_PORT_REQ, SH_PORT_UNKN);
1708 sh_portchk_add_to_list (IPPROTO_TCP, 8003, haddr_local, NULL, SH_PORT_NOT, SH_PORT_UNKN);
1709 sh_portchk_add_to_list (IPPROTO_TCP, 8004, haddr_local, NULL, SH_PORT_IGN, SH_PORT_UNKN);
1710 sh_portchk_add_to_list (IPPROTO_TCP, -1, haddr_local, "foo1", SH_PORT_NOT, SH_PORT_UNKN);
1711 sh_portchk_add_to_list (IPPROTO_TCP, -1, haddr_local, "foo2", SH_PORT_REQ, SH_PORT_UNKN);
1712 sh_portchk_add_to_list (IPPROTO_TCP, -1, haddr_local, "foo3", SH_PORT_NOT, SH_PORT_UNKN);
1713 sh_portchk_add_to_list (IPPROTO_TCP, -1, haddr_local, "foo4", SH_PORT_REQ, SH_PORT_UNKN);
1714 sh_portchk_add_to_list (IPPROTO_TCP, -1, haddr_local, "foo5", SH_PORT_IGN, SH_PORT_UNKN);
1715
1716 sh_portchk_check_list (&portlist_tcp, IPPROTO_TCP, SH_PORT_NOREPT);
1717
1718 CuAssertPtrNotNull(tc, portlist_tcp);
1719
1720 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, haddr_local, NULL);
1721 CuAssertPtrNotNull(tc, portent);
1722
1723 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8001, haddr_local, NULL);
1724 CuAssertTrue(tc, NULL == portent);
1725
1726 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8002, haddr_local, NULL);
1727 CuAssertPtrNotNull(tc, portent);
1728
1729 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8003, haddr_local, NULL);
1730 CuAssertTrue(tc, NULL == portent);
1731
1732 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8004, haddr_local, NULL);
1733 CuAssertPtrNotNull(tc, portent);
1734
1735 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, haddr_local, "foo1");
1736 CuAssertTrue(tc, NULL == portent);
1737
1738 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, haddr_local, "foo2");
1739 CuAssertPtrNotNull(tc, portent);
1740 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo2"));
1741
1742 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, haddr_local, "foo3");
1743 CuAssertTrue(tc, NULL == portent);
1744
1745 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, haddr_local, "foo4");
1746 CuAssertPtrNotNull(tc, portent);
1747 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo4"));
1748
1749 portent = sh_portchk_get_from_list(IPPROTO_TCP, 8000, haddr_local, "foo5");
1750 CuAssertPtrNotNull(tc, portent);
1751 CuAssertTrue(tc, 0 == strcmp(portent->service, "foo5"));
1752
1753 CuAssertTrue(tc, 0 == sh_portchk_blacklist(666, haddr_local, IPPROTO_TCP));
1754 CuAssertTrue(tc, 0 != sh_portchk_blacklist(666, haddr_local, IPPROTO_TCP));
1755 CuAssertTrue(tc, 0 == sh_portchk_blacklist(667, haddr_local, IPPROTO_TCP));
1756 CuAssertTrue(tc, 0 == sh_portchk_blacklist(668, haddr_local, IPPROTO_TCP));
1757 CuAssertTrue(tc, 0 == sh_portchk_blacklist(666, haddr_local, IPPROTO_UDP));
1758 CuAssertTrue(tc, 0 != sh_portchk_blacklist(666, haddr_local, IPPROTO_UDP));
1759 CuAssertTrue(tc, 0 == sh_portchk_blacklist(667, haddr_local, IPPROTO_UDP));
1760 CuAssertTrue(tc, 0 == sh_portchk_blacklist(668, haddr_local, IPPROTO_UDP));
1761
1762 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(668, haddr_local, IPPROTO_UDP));
1763 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(667, haddr_local, IPPROTO_UDP));
1764 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(666, haddr_local, IPPROTO_UDP));
1765 CuAssertTrue(tc, 0 == sh_portchk_is_blacklisted(665, haddr_local, IPPROTO_UDP));
1766
1767 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(668, haddr_local, IPPROTO_TCP));
1768 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(667, haddr_local, IPPROTO_TCP));
1769 CuAssertTrue(tc, 0 != sh_portchk_is_blacklisted(666, haddr_local, IPPROTO_TCP));
1770 CuAssertTrue(tc, 0 == sh_portchk_is_blacklisted(665, haddr_local, IPPROTO_TCP));
1771#else
1772 (void) tc; /* fix compiler warning */
1773#endif
1774 return;
1775}
1776#endif
1777
1778#ifdef TEST_ONLY
1779
1780void usage (char * pname)
1781{
1782 printf ("%s [-r|--required interface:portlist][-o|--optional interface:portlist][--no-udp][-d|--debug] hostname\n\n", pname);
1783 printf (" Check local host for open ports; Version %s\n\n", PORTCHK_VERSION);
1784 printf (" Interface: Numeric address for an interface, e.g. 127.0.0.1\n");
1785 printf (" Portlist: List of ports or services, e.g. 22/tcp,nfs/udp,nlockmgr/udp\n");
1786 printf (" required -> must be open\n");
1787 printf (" optional -> may be open or closed\n");
1788 printf (" RPC services must be specified with service **name**, others with **port number**\n\n");
1789 printf (" Example:\n");
1790 printf (" %s --required 192.168.1.2:22/tcp,nfs/udp,nlockmgr/udp\n\n", pname);
1791 return;
1792}
1793
1794int main(int argc, char *argv[])
1795{
1796 char * pname = argv[0];
1797
1798
1799 /*
1800 test_lists();
1801
1802 portlist_tcp = sh_portchk_kill_list (portlist_tcp);
1803 portlist_udp = sh_portchk_kill_list (portlist_udp);
1804 */
1805
1806 // sh_portchk_add_required ("127.0.0.1 : nlockmgr/tcp, 5308/tcp, nfs/tcp");
1807
1808 while (argc > 1 && argv[1][0] == '-')
1809 {
1810 if (0 == strcmp(argv[1], "--help") || 0 == strcmp(argv[1], "-h"))
1811 {
1812 usage(pname);
1813 exit (0);
1814 }
1815 else if (0 == strcmp(argv[1], "--required") || 0 == strcmp(argv[1], "-r"))
1816 {
1817 if (argc < 3)
1818 {
1819 usage(pname);
1820 exit (1);
1821 }
1822 sh_portchk_add_required (argv[2]);
1823 --argc; ++argv;
1824 }
1825 else if (0 == strcmp(argv[1], "--optional") || 0 == strcmp(argv[1], "-o"))
1826 {
1827 if (argc < 3)
1828 {
1829 usage(pname);
1830 exit (1);
1831 }
1832 sh_portchk_add_optional (argv[2]);
1833 --argc; ++argv;
1834 }
1835 else if (0 == strcmp(argv[1], "--no-udp"))
1836 {
1837 sh_portchk_check_udp = 0;
1838 }
1839 else if (0 == strcmp(argv[1], "--debug") || 0 == strcmp(argv[1], "-d"))
1840 {
1841 portchk_debug = 1;
1842 }
1843 else
1844 {
1845 usage(pname);
1846 exit (1);
1847 }
1848 --argc; ++argv;
1849 }
1850
1851 if (argc < 2)
1852 {
1853 usage(pname);
1854 exit (1);
1855 }
1856
1857 portchk_hostname = argv[1];
1858
1859 if (0 != sh_portchk_init ())
1860 {
1861 usage(pname);
1862 exit (1);
1863 }
1864
1865 sh_portchk_check();
1866
1867 return 0;
1868}
1869#endif
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