source: trunk/src/sh_xfer_syslog.c@ 530

Last change on this file since 530 was 481, checked in by katerina, 9 years ago

Enhancements and fixes for tickets #374, #375, #376, #377, #378, and #379.
File size: 11.7 KB
RevLine 
[481]1/* SAMHAIN file system integrity testing */
2/* Copyright (C) 1999, 2000 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#include "config_xor.h"
21
22#include <string.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <syslog.h>
26
27/* Must be early on FreeBSD
28 */
29#include <sys/types.h>
30#include <sys/socket.h>
31#include <netdb.h>
32#include <netinet/in.h>
33
34#if TIME_WITH_SYS_TIME
35#include <sys/time.h>
36#include <time.h>
37#else
38#if HAVE_SYS_TIME_H
39#include <sys/time.h>
40#else
41#include <time.h>
42#endif
43#endif
44
45#include <unistd.h>
46#include <fcntl.h>
47
48#ifdef SH_WITH_SERVER
49
50#include "samhain.h"
51#include "sh_tools.h"
52#include "sh_utils.h"
53#include "sh_ipvx.h"
54
55#undef FIL__
56#define FIL__ _("sh_xfer_syslog.c")
57
58#ifdef INET_SYSLOG
59
60extern void sh_xfer_printerr(char * str, int errnum, unsigned int port, int line);
61extern int sh_xfer_syslog_sock[SH_SOCKMAX];
62extern int sh_xfer_syslog_sock_n;
63extern int SH_MINSOCK;
64
65/* Unlike Linux / FreeBSD, most systems don't define the stuff below
66 * in syslog.h
67 */
68
69#ifndef LOG_FAC
70#define LOG_FAC(p) (((p) & LOG_FACMASK) >> 3)
71#endif
72
73#ifndef LOG_PRI
74#define LOG_PRI(p) ((p) & LOG_PRIMASK)
75#endif
76
77typedef struct sh_code {
78 char *c_name;
79 int c_val;
80} SH_CODE;
81
82SH_CODE sh_facilitynames[] =
83{
84#ifdef LOG_AUTH
85 { N_("auth"), LOG_AUTH },
86#endif
87#ifdef LOG_AUTHPRIV
88 { N_("authpriv"), LOG_AUTHPRIV },
89#endif
90#ifdef LOG_CRON
91 { N_("cron"), LOG_CRON },
92#endif
93#ifdef LOG_DAEMON
94 { N_("daemon"), LOG_DAEMON },
95#endif
96#ifdef LOG_FTP
97 { N_("ftp"), LOG_FTP },
98#endif
99#ifdef LOG_KERN
100 { N_("kern"), LOG_KERN },
101#endif
102#ifdef LOG_LPR
103 { N_("lpr"), LOG_LPR },
104#endif
105#ifdef LOG_MAIL
106 { N_("mail"), LOG_MAIL },
107#endif
108#ifdef INTERNAL_MARK
109 { N_("mark"), INTERNAL_MARK }, /* INTERNAL */
110#endif
111#ifdef LOG_NEWS
112 { N_("news"), LOG_NEWS },
113#endif
114#ifdef LOG_AUTH
115 { N_("security"), LOG_AUTH }, /* DEPRECATED */
116#endif
117#ifdef LOG_SYSLOG
118 { N_("syslog"), LOG_SYSLOG },
119#endif
120#ifdef LOG_USER
121 { N_("user"), LOG_USER },
122#endif
123#ifdef LOG_UUCP
124 { N_("uucp"), LOG_UUCP },
125#endif
126#ifdef LOG_LOCAL0
127 { N_("local0"), LOG_LOCAL0 },
128#endif
129#ifdef LOG_LOCAL1
130 { N_("local1"), LOG_LOCAL1 },
131#endif
132#ifdef LOG_LOCAL2
133 { N_("local2"), LOG_LOCAL2 },
134#endif
135#ifdef LOG_LOCAL3
136 { N_("local3"), LOG_LOCAL3 },
137#endif
138#ifdef LOG_LOCAL4
139 { N_("local4"), LOG_LOCAL4 },
140#endif
141#ifdef LOG_LOCAL5
142 { N_("local5"), LOG_LOCAL5 },
143#endif
144#ifdef LOG_LOCAL6
145 { N_("local6"), LOG_LOCAL6 },
146#endif
147#ifdef LOG_LOCAL7
148 { N_("local7"), LOG_LOCAL7 },
149#endif
150 { NULL, -1 }
151};
152
153
154SH_CODE sh_prioritynames[] =
155{
156#ifdef LOG_ALERT
157 { N_("alert"), LOG_ALERT },
158#endif
159#ifdef LOG_CRIT
160 { N_("crit"), LOG_CRIT },
161#endif
162#ifdef LOG_DEBUG
163 { N_("debug"), LOG_DEBUG },
164#endif
165#ifdef LOG_EMERG
166 { N_("emerg"), LOG_EMERG },
167#endif
168#ifdef LOG_ERR
169 { N_("err"), LOG_ERR },
170#endif
171#ifdef LOG_ERR
172 { N_("error"), LOG_ERR }, /* DEPRECATED */
173#endif
174#ifdef LOG_INFO
175 { N_("info"), LOG_INFO },
176#endif
177#ifdef INTERNAL_NOPRI
178 { N_("none"), INTERNAL_NOPRI }, /* INTERNAL */
179#endif
180#ifdef LOG_NOTICE
181 { N_("notice"), LOG_NOTICE },
182#endif
183#ifdef LOG_EMERG
184 { N_("panic"), LOG_EMERG }, /* DEPRECATED */
185#endif
186#ifdef LOG_WARNING
187 { N_("warn"), LOG_WARNING }, /* DEPRECATED */
188#endif
189#ifdef LOG_WARNING
190 { N_("warning"), LOG_WARNING },
191#endif
192 { NULL, -1 }
193};
194
195static int enable_syslog_socket = S_FALSE;
196
197int sh_xfer_recv_syslog_socket (int fd)
198{
199 static time_t return_next = 0;
200 int priority = 0;
201 int fac, pri;
202 int i;
203 char * cfac = NULL;
204 char * cpri = NULL;
205 int res;
206 char * tmp;
207 char * bptr;
208 char * ptr = NULL;
209 char buf[1048];
210 struct sockaddr_in from;
211 char errbuf[SH_ERRBUF_SIZE];
212
213 struct sh_sockaddr ss;
214 struct sockaddr * sa = (struct sockaddr *) &from;
215 char namebuf[SH_BUFSIZE];
216
217 /* The 6th argument in recvfrom is *socklen_t in Linux and *BSD,
218 * but *int everywhere else. Because socklen_t is unsigned int, there
219 * should be no problem as long as sizeof(struct sockaddr_in) < INT_MAX ...
220 */
221 unsigned int fromlen = sizeof(from);
222
223 if (enable_syslog_socket == S_FALSE)
224 return 0;
225
226 SL_ENTER(_("sh_xfer_recv_syslog_socket"));
227
228 if (return_next > 0)
229 {
230 if ( (time(NULL) - return_next) < 2)
231 SL_RETURN( 0, _("sh_xfer_recv_syslog_socket"));
232 else
233 return_next = 0;
234 }
235
236 res = recvfrom(fd, buf, 1047, 0, (struct sockaddr *) &from, &fromlen);
237
238 sh_ipvx_save(&ss, sa->sa_family, (struct sockaddr *) &from);
239 sh_ipvx_ntoa(namebuf, sizeof(namebuf), &ss);
240
241 if (res > 0)
242 {
243 res = (res < 1047) ? res : 1047;
244 buf[res] = '\0';
245 if (res > 1 && buf[res-1] == '\n')
246 buf[res-1] = '\0';
247
248 /* here we expect an xml formatted message, thus we don't
249 escape xml special chars (flag == 0) */
250 /* commented out to not escape twice */
251 /* bptr = sh_tools_safe_name(buf, 0); */
252 bptr = buf;
253
254 if (!bptr || !(*bptr))
255 {
256 res = errno;
257 TPT(( 0, FIL__, __LINE__, _("msg=<UDP error: %d>\n"), res));
258 sh_error_handle((-1), FIL__, __LINE__, res, MSG_ERR_SYSLOG,
259 sh_error_message(res, errbuf, sizeof(errbuf)),
260 namebuf);
261 SL_RETURN( (-1), _("sh_xfer_recv_syslog_socket"));
262 }
263
264 TPT(( 0, FIL__, __LINE__, _("msg=<UDP message from %s>\n"), namebuf ));
265
266 ptr = bptr;
267 i = 0;
268 if (*ptr == '<')
269 {
270 ++ptr; ++i;
271 while (i < res &&
272 (unsigned char) *ptr > 47 && (unsigned char) *ptr < 58)
273 {
274 priority = 10 * priority + (*ptr - '0');
275 ++ptr;
276 ++i;
277 }
278 if (*ptr == '>')
279 ++ptr;
280 }
281 fac = LOG_FAC(priority);
282 i = 0;
283 while (sh_facilitynames[i].c_name != NULL)
284 {
285 if (sh_facilitynames[i].c_val == (fac<<3))
286 { cfac = sh_util_strdup(_(sh_facilitynames[i].c_name)); break; }
287 ++i;
288 }
289 pri = LOG_PRI(priority);
290 i = 0;
291 while (sh_prioritynames[i].c_name != NULL)
292 {
293 if (sh_prioritynames[i].c_val == pri)
294 { cpri = sh_util_strdup(_(sh_prioritynames[i].c_name)); break; }
295 ++i;
296 }
297
298 /* here we do not expect an xml formatted message, thus we escape
299 xml special chars (flag == 1) */
300 tmp = sh_tools_safe_name (ptr, 1);
301 sh_error_handle((-1), FIL__, __LINE__, 0, MSG_INET_SYSLOG,
302 namebuf,
303 (cfac == NULL) ? _("none") : cfac,
304 (cpri == NULL) ? _("none") : cpri,
305 (tmp == NULL) ? _("none") : tmp);
306 if (cfac != NULL)
307 SH_FREE(cfac);
308 if (cpri != NULL)
309 SH_FREE(cpri);
310 SH_FREE(tmp);
311 /* SH_FREE(bptr); */
312 }
313
314 else if (res < 0 && errno != EINTR)
315 {
316 res = errno;
317 TPT(( 0, FIL__, __LINE__, _("msg=<UDP error: %d>\n"), res));
318 sh_error_handle((-1), FIL__, __LINE__, res, MSG_ERR_SYSLOG,
319 sh_error_message(res, errbuf, sizeof(errbuf)),
320 namebuf);
321
322 /* don't accept anything the next 2 seconds
323 */
324 return_next = time(NULL);
325 SL_RETURN( (-1), _("sh_xfer_recv_syslog_socket"));
326 }
327 SL_RETURN( (0), _("sh_xfer_recv_syslog_socket"));
328}
329
330int set_syslog_active(const char * c)
331{
332 return sh_util_flagval(c, &enable_syslog_socket);
333}
334
335static int do_syslog_socket(int domain, int type, int protocol,
336 struct sockaddr * sa, int salen)
337{
338 int flag = 1; /* non-zero to enable an option */
339 int sock;
340 int errnum;
341 int res;
342
343 /* create the socket, bind() it and listen()
344 */
345 sock = socket(domain, type, protocol);
346
347 if (sock < 0)
348 {
349 errnum = errno;
350 sh_xfer_printerr (_("syslog socket"), errnum, 514, __LINE__);
351 return -1;
352 }
353 (void) retry_fcntl( FIL__, __LINE__, sock, F_SETFD, 1 );
354
355 if ( setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
356 (void *) &flag, sizeof(flag)) < 0 )
357 {
358 errnum = errno;
359 sh_xfer_printerr (_("syslog setsockopt SO_REUSEADDR"),
360 errnum, 514, __LINE__);
361 return -1;
362 }
363
364#if defined(SO_BSDCOMPAT)
365 if ( setsockopt(sock, SOL_SOCKET, SO_BSDCOMPAT,
366 (void *) &flag, sizeof(flag)) < 0 )
367 {
368 errnum = errno;
369 sh_xfer_printerr (_("syslog setsockopt SO_BSDCOMPAT"),
370 errnum, 514, __LINE__);
371 return -1;
372 }
373#endif
374
375 res = bind(sock, sa, salen);
376
377 if ( res < 0)
378 {
379 errnum = errno;
380 sh_xfer_printerr (_("syslog bind"), errnum, 514, __LINE__);
381 sl_close_fd(FIL__, __LINE__, sock);
382 return -1;
383 }
384 return sock;
385}
386
387/* callerFlag == S_TRUE means override the enable_syslog_socket flag
388 */
389int sh_xfer_create_syslog_socket (int callerFlag)
390{
391 int sock;
392
393#if defined(USE_IPVX)
394 struct addrinfo *ai;
395 struct addrinfo *p;
396 struct addrinfo hints;
397#else
398 struct sockaddr_in addr;
399 int addrlen = sizeof(addr);
400#endif
401
402 SL_ENTER(_("sh_xfer_create_syslog_socket"));
403
404 if (callerFlag == S_FALSE)
405 {
406 if (enable_syslog_socket == S_FALSE && sh_xfer_syslog_sock_n > 0)
407 {
408 /* user does not wish to use this facility
409 */
410 TPT(( 0, FIL__, __LINE__, _("msg=<close syslog socket>\n")));
411 for (sock = 0; sock < sh_xfer_syslog_sock_n; ++sock)
412 {
413 sl_close_fd(FIL__, __LINE__, sh_xfer_syslog_sock[sock]);
414 sh_xfer_syslog_sock[0] = -1;
415 }
416 }
417 SL_RETURN((-1), _("sh_xfer_create_syslog_socket"));
418 }
419
420 sh_xfer_printerr (NULL, 0, 514, __LINE__);
421
422#if !defined(USE_IPVX)
423
424 memset(&addr, 0, sizeof(addr));
425 addr.sin_family = AF_INET;
426 addr.sin_port = htons(514);
427
428 sock = do_syslog_socket(AF_INET, SOCK_DGRAM, 0,
429 (struct sockaddr *) &addr, addrlen);
430
431 if (sock >= 0) {
432 sh_xfer_syslog_sock[0] = sock;
433 sh_xfer_syslog_sock_n = 1;
434 }
435
436#else
437 memset (&hints, '\0', sizeof (hints));
438 hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
439 hints.ai_socktype = SOCK_DGRAM;
440 if (getaddrinfo (NULL, "syslog", &hints, &ai) != 0)
441 {
442 int errnum = errno;
443 sh_xfer_printerr (_("getaddrinfo"), errnum, 514, __LINE__);
444 SL_RETURN((-1), _("sh_xfer_create_syslog_socket"));
445 }
446
447 p = ai;
448
449 while (p != NULL && sh_xfer_syslog_sock_n < SH_SOCKMAX)
450 {
451 sock = do_syslog_socket(p->ai_family, p->ai_socktype, p->ai_protocol,
452 p->ai_addr, p->ai_addrlen);
453
454 if (sock >= 0) {
455 if (sh_xfer_syslog_sock_n < SH_SOCKMAX) {
456 sh_xfer_syslog_sock[sh_xfer_syslog_sock_n] = sock;
457 ++sh_xfer_syslog_sock_n;
458 }
459 else {
460 sl_close_fd (FIL__, __LINE__, sock);
461 }
462 } else if (sock == -1) {
463 freeaddrinfo (ai);
464 goto end;
465 }
466 p = p->ai_next;
467 }
468 freeaddrinfo (ai);
469
470 end:
471#endif
472 if (sh_xfer_syslog_sock_n > 1)
473 SH_MINSOCK += (sh_xfer_syslog_sock_n - 1);
474
475 SL_RETURN((sh_xfer_syslog_sock_n), _("sh_xfer_create_syslog_socket"));
476}
477/* #ifdef INET_SYSLOG */
478#endif
479
480/* #ifdef SH_WITH_SERVER */
481#endif
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