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source: branches/samhain-2_2-branch/src/sh_prelude.c@ 476

Last change on this file since 476 was 40, checked in by rainer, 19 years ago
Fix for tickets #13, #14, #15, #16, #17
File size: 31.7 KB

Line
1	/*
2	*
3	* Copyright (C) 2005 Yoann Vandoorselaere, Prelude IDS Technologies
4	* Rainer Wichmann
5	*
6	* This program is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2, or (at your option)
9	* 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; see the file COPYING. If not, write to
18	* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19	*
20	*/
21
22	/*
23	* 28/04/2005 : R.W.:
24	* move libprelude 0.8 code to seperate file
25	*
26	* 23/04/2005 : R.W.:
27	* include libprelude 0.9 code from Yoann Vandoorselaere
28	*/
29
30
31	/*
32	* for strptime()
33	*/
34	#define _GNU_SOURCE 1
35
36	#include "config_xor.h"
37
38	#include <stdio.h>
39	#include <string.h>
40	#include <sys/types.h>
41
42	#if TIME_WITH_SYS_TIME
43
44	# include <sys/time.h>
45	# include <time.h>
46
47	#else
48
49	# if HAVE_SYS_TIME_H
50	# include <sys/time.h>
51	# else
52	# include <time.h>
53	# endif
54
55	#endif
56
57	#include <unistd.h>
58	#include <syslog.h>
59	#include <pwd.h>
60
61	int sh_argc_store;
62	char ** sh_argv_store;
63
64	#if defined(HAVE_LIBPRELUDE) && defined(HAVE_LIBPRELUDE_9)
65
66
67	/*
68	* _() macros are samhain specific; they are used to replace string
69	* constants at runtime. This is part of the samhain stealth mode
70	* (fill string constants with encoded strings, decode at runtime).
71	*/
72	#define FIL__ _("sh_prelude.c")
73
74
75	#include <libprelude/idmef.h>
76	#include <libprelude/prelude.h>
77
78	/*
79	* includes for samhain-specific functions (sl_strstr, sh_error_handle)
80	*/
81	#include "slib.h"
82	#include "sh_cat.h"
83	#include "sh_error_min.h"
84	#include "sh_prelude.h"
85
86	/*
87	* When SH_USE_XML is set, value are formated using name="value".
88	* Otherwise, value is formatted using the format name=<value>.
89	*/
90	#ifdef SH_USE_XML
91	# define VALUE_DELIM_START '"'
92	# define VALUE_DELIM_END '"'
93	#else
94	# define VALUE_DELIM_START '<'
95	# define VALUE_DELIM_END '>'
96	#endif
97
98	#define IDMEF_ANALYZER_MODEL _("Samhain")
99	#define IDMEF_ANALYZER_CLASS _("Integrity Checker")
100	#define IDMEF_ANALYZER_VERSION VERSION
101	#define IDMEF_ANALYZER_MANUFACTURER _("Samhain by Rainer Wichmann")
102
103	#define CLASSIFICATION_URL _("http://www.la-samhna.de/samhain/")
104
105
106
107	/*
108	* 0 = not initialized; -1 = failed; 1 = initialized
109	*/
110	static int initialized = 0;
111	static int ready_for_init = 0;
112
113	static char *profile = NULL;
114	static prelude_client_t *client = NULL;
115
116	static int severity_map[1 + (unsigned int) IDMEF_IMPACT_SEVERITY_HIGH] = {
117	/* 0: unused (?) */ 0,
118	/* 1: INFO */ 0,
119	/* 2: LOW */ SH_ERR_ALL\|SH_ERR_INFO,
120	/* 3: MEDIUM */ SH_ERR_NOTICE\|SH_ERR_WARN\|SH_ERR_STAMP\|SH_ERR_ERR,
121	/* 4: HIGH */ SH_ERR_SEVERE\|SH_ERR_FATAL
122	};
123
124	/* returns 0/tiger, 1/sha1, or 2/md5
125	*/
126	extern int sh_tiger_get_hashtype(void);
127
128	static void clear_and_set (int setpos, int flag)
129	{
130	unsigned int i;
131	/* clear everywhere, and set at correct position */
132	for (i = 1; i < (1 + (unsigned int) IDMEF_IMPACT_SEVERITY_HIGH); ++i)
133	severity_map[i] &= ~flag;
134	severity_map[setpos] \|= flag;
135	return;
136	}
137
138	static int set_prelude_severity_int (const char * str, int prelude_sev)
139	{
140	char * p;
141	char * dup = strdup (str);
142
143	if (!dup)
144	return -1;
145
146	p = strtok (dup, ", \t");
147	if (p) {
148	do {
149	if (0 == strcmp (p, _("alert")))
150	clear_and_set (prelude_sev, SH_ERR_FATAL);
151	else if (0 == strcmp (p, _("crit")))
152	clear_and_set (prelude_sev, SH_ERR_SEVERE);
153	else if (0 == strcmp (p, _("err")))
154	clear_and_set (prelude_sev, SH_ERR_ERR);
155	else if (0 == strcmp (p, _("mark")))
156	clear_and_set (prelude_sev, SH_ERR_STAMP);
157	else if (0 == strcmp (p, _("warn")))
158	clear_and_set (prelude_sev, SH_ERR_WARN);
159	else if (0 == strcmp (p, _("notice")))
160	clear_and_set (prelude_sev, SH_ERR_NOTICE);
161	else if (0 == strcmp (p, _("debug")))
162	clear_and_set (prelude_sev, SH_ERR_ALL);
163	else if (0 == strcmp (p, _("info")))
164	clear_and_set (prelude_sev, SH_ERR_INFO);
165	else {
166	free (dup);
167	return -1;
168	}
169	p = strtok (NULL, ", \t");
170	} while (p);
171	}
172	free(dup);
173	return 0;
174	}
175
176	int sh_prelude_map_info (const char * str)
177	{
178	return (set_prelude_severity_int(str,(int)IDMEF_IMPACT_SEVERITY_INFO));
179	}
180	int sh_prelude_map_low (const char * str)
181	{
182	return (set_prelude_severity_int(str,(int)IDMEF_IMPACT_SEVERITY_LOW));
183	}
184	int sh_prelude_map_medium (const char * str)
185	{
186	return (set_prelude_severity_int(str,(int)IDMEF_IMPACT_SEVERITY_MEDIUM));
187	}
188	int sh_prelude_map_high (const char * str)
189	{
190	return (set_prelude_severity_int(str,(int)IDMEF_IMPACT_SEVERITY_HIGH));
191	}
192
193	static idmef_impact_severity_t map_severity (int sam_sev)
194	{
195	int i;
196	int max = 1 + (unsigned int) IDMEF_IMPACT_SEVERITY_HIGH;
197	idmef_impact_severity_t retval = IDMEF_IMPACT_SEVERITY_MEDIUM;
198
199	for (i = 0; i < max; ++i) {
200	if (severity_map[i] & sam_sev) {
201	retval = (idmef_impact_severity_t) i;
202	}
203	}
204	return retval;
205	}
206
207	static char do_get_value(char ptr, char delim_start, char delim_end)
208	{
209	char *ret = NULL;
210
211	ptr = strchr(ptr, delim_start);
212	if ( ! ptr )
213	return NULL;
214
215	ret = ++ptr;
216
217	ptr = strchr(ptr, delim_end);
218	if ( ! ptr )
219	return NULL;
220
221	*ptr = '\0';
222	ret = strdup(ret);
223	*ptr = delim_end;
224
225	return ret;
226	}
227
228
229
230	static char get_value(char msg, const char toktmp, const char toksuffix)
231	{
232	char *ptr, tok[128];
233
234	snprintf(tok, sizeof(tok), "%s%s=", toktmp, (toksuffix) ? toksuffix : "");
235
236	ptr = strstr(msg, tok);
237	if ( ! ptr )
238	return NULL;
239
240	return do_get_value(ptr, VALUE_DELIM_START, VALUE_DELIM_END);
241	}
242
243
244
245	static char get_time_value(char msg, const char toktmp, const char toksuffix)
246	{
247
248	char ret, ptr, tok[128];
249
250	snprintf(tok, sizeof(tok), "%s%s=", toktmp, (toksuffix) ? toksuffix : "");
251
252	ptr = strstr(msg, tok);
253	if ( ! ptr )
254	return NULL;
255
256	#ifndef SH_USE_XML
257	ret = do_get_value(ptr, '[', ']');
258	#else
259	ret = do_get_value(ptr, VALUE_DELIM_START, VALUE_DELIM_END);
260	#endif
261
262	return ret;
263	}
264
265
266
267
268	#if 0
269	void debug_print_message(idmef_message_t *msg)
270	{
271	int ret;
272	prelude_io_t *fd;
273
274	ret = prelude_io_new(&fd);
275	if ( ret < 0 )
276	return;
277
278	prelude_io_set_file_io(fd, stderr);
279	idmef_message_print(idmef, fd);
280
281	prelude_io_destroy(fd);
282	}
283	#endif
284
285
286
287	static int idmef_time_from_samhain(idmef_time_t *time, const char str)
288	{
289	int ret;
290	char *ptr;
291	time_t utc;
292	struct tm lt;
293
294	/*
295	* Samhain stamp are encoded in UTC.
296	*/
297	ptr = strptime(str, _("%Y-%m-%dT%H:%M:%S"), &lt);
298	if ( ! ptr ) {
299	sh_error_handle((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
300	_("could not format Samhain time"), _("idmef_time_from_samhain"));
301	return -1;
302	}
303
304	utc = prelude_timegm(&lt);
305
306	ret = idmef_time_new_from_time(time, &utc);
307	if ( ret < 0 )
308	return ret;
309
310	return 0;
311	}
312
313	/* flawfinder: ignore // is part of name, not access() */
314	static void get_access_info(idmef_file_access_t access, char mode, int pos, int mpos)
315	{
316	int got = 0;
317	int ret;
318	prelude_string_t *str;
319
320	do {
321	if ( mode[pos] == 'r' ) {
322	/* flawfinder: ignore // is part of name, not access() */
323	ret = idmef_file_access_new_permission(access, &str, IDMEF_LIST_APPEND);
324	if ( ret < 0 )
325	return;
326	prelude_string_set_dup(str, _("read"));
327	++got;
328	}
329	else if ( mode[pos] == 'w' ) {
330	/* flawfinder: ignore // is part of name, not access() */
331	ret = idmef_file_access_new_permission(access, &str, IDMEF_LIST_APPEND);
332	if ( ret < 0 )
333	return;
334	prelude_string_set_dup(str, _("write"));
335	++got;
336	}
337	else if ( mode[pos] == 'x' \|\| mode[pos] == 's' \|\| mode[pos] == 't') {
338	/* flawfinder: ignore // is part of name, not access() */
339	ret = idmef_file_access_new_permission(access, &str, IDMEF_LIST_APPEND);
340	if ( ret < 0 )
341	return;
342
343	if ( mode[pos] == 'x' && mode[0] == 'd' )
344	prelude_string_set_dup(str, _("search"));
345
346	else if ( mode[pos] == 'x' \|\| mode[pos] == 't' )
347	prelude_string_set_dup(str, _("execute"));
348
349	else /* 's' */
350	prelude_string_set_dup(str, _("executeAs"));
351	++got;
352	}
353	++pos;
354	} while (pos <= mpos);
355
356	if ( got == 0 ) {
357	/* flawfinder: ignore // is part of name, not access() */
358	ret = idmef_file_access_new_permission(access, &str, IDMEF_LIST_APPEND);
359	if ( ret < 0 )
360	return;
361	prelude_string_set_dup(str, _("noAccess"));
362	}
363	return;
364	}
365
366
367	static void get_file_infos(idmef_target_t target, char msg,
368	idmef_file_category_t category)
369	{
370	int ret;
371	int hashtype = 0;
372	char *ptr;
373	idmef_time_t *time;
374	idmef_file_t *file;
375	idmef_inode_t *inode;
376	prelude_string_t *str;
377	idmef_checksum_t *checksum;
378	idmef_file_access_t access; / flawfinder: ignore */
379	idmef_user_id_t *userid;
380	const char *suffix = (category == IDMEF_FILE_CATEGORY_CURRENT) ? "_new" : "_old";
381	char *mode = NULL;
382
383	ret = idmef_target_new_file(target, &file, IDMEF_LIST_APPEND);
384	if ( ret < 0 )
385	return;
386	idmef_file_set_category(file, category);
387
388	ptr = get_value(msg, _("path"), NULL);
389	if ( ptr ) {
390	/*
391	* In term of IDMEF, this is the full path,
392	* including the name.
393	*/
394	ret = idmef_file_new_path(file, &str);
395	if ( ret < 0 ) {
396	free(ptr);
397	return;
398	}
399	prelude_string_set_nodup(str, ptr);
400
401	ptr = strrchr(ptr, '/');
402	if ( ptr ) {
403	ret = idmef_file_new_name(file, &str);
404	if ( ret == 0 ) {
405	prelude_string_set_dup(str, ptr + 1);
406	}
407	}
408	}
409
410	ptr = get_value(msg, _("size"), suffix);
411	if ( ptr ) {
412	idmef_file_set_data_size(file, strtoul(ptr, NULL, 10));
413	free(ptr);
414	}
415
416	ptr = get_time_value(msg, _("mtime"), suffix);
417	if ( ptr ) {
418	ret = idmef_time_from_samhain(&time, ptr);
419	if ( ret == 0 ) {
420	idmef_file_set_modify_time(file, time);
421	}
422	free(ptr);
423	}
424
425	ptr = get_time_value(msg, _("ctime"), suffix);
426	if ( ptr ) {
427	ret = idmef_time_from_samhain(&time, ptr);
428	if ( ret == 0 ) {
429	idmef_file_set_create_time(file, time);
430	}
431	free(ptr);
432	}
433
434	ptr = get_value(msg, _("inode"), suffix);
435	if ( ptr ) {
436	ret = idmef_file_new_inode(file, &inode);
437	if ( ret == 0 ) {
438	char * dev = get_value(msg, _("dev"), suffix);
439	if (dev) {
440	char * q = strchr(dev, ',');
441	if (*q) {
442	*q = '\0'; ++q;
443	idmef_inode_set_major_device(inode, strtoul(dev, NULL, 0));
444	idmef_inode_set_minor_device(inode, strtoul( q, NULL, 0));
445	}
446	free(dev);
447	}
448	idmef_inode_set_number(inode, strtoul(ptr, NULL, 10));
449	}
450	free(ptr);
451	}
452
453	ptr = get_value(msg, _("chksum"), suffix);
454	if ( ptr ) {
455	ret = idmef_file_new_checksum(file, &checksum, IDMEF_LIST_APPEND);
456	if ( ret < 0 ) {
457	free(ptr);
458	goto get_mode;
459	}
460
461	hashtype = sh_tiger_get_hashtype();
462
463	if (hashtype == 0)
464	idmef_checksum_set_algorithm(checksum, IDMEF_CHECKSUM_ALGORITHM_TIGER);
465
466	else if (hashtype == 1)
467	idmef_checksum_set_algorithm(checksum, IDMEF_CHECKSUM_ALGORITHM_SHA1);
468
469	else if (hashtype == 2)
470	idmef_checksum_set_algorithm(checksum, IDMEF_CHECKSUM_ALGORITHM_MD5);
471
472	else
473	idmef_checksum_set_algorithm(checksum, IDMEF_CHECKSUM_ALGORITHM_TIGER);
474
475
476	ret = idmef_checksum_new_value(checksum, &str);
477	if ( ret < 0 ) {
478	free(ptr);
479	goto get_mode;
480	}
481
482	/* will be freed on destroy()
483	*/
484	prelude_string_set_nodup(str, ptr);
485	}
486
487	get_mode:
488
489	mode = get_value(msg, _("mode"), suffix);
490	if ( mode ) {
491	/* flawfinder: ignore // is part of name, not access() */
492	ret = idmef_file_new_file_access(file, &access, IDMEF_LIST_APPEND);
493	if ( ret < 0 )
494	goto get_owner;
495
496	/* flawfinder: ignore // is part of name, not access() */
497	ret = idmef_file_access_new_user_id(access, &userid);
498	if ( ret < 0 )
499	goto get_owner;
500	idmef_user_id_set_type(userid, IDMEF_USER_ID_TYPE_OTHER_PRIVS);
501
502	/* flawfinder: ignore // is part of name, not access() */
503	get_access_info ( access, mode, 7, 9 );
504	}
505
506	get_owner:
507
508	ptr = get_value(msg, _("owner"), suffix);
509	if ( ptr ) {
510	char * uid;
511
512	/* flawfinder: ignore // is part of name, not access() */
513	ret = idmef_file_new_file_access(file, &access, IDMEF_LIST_APPEND);
514	if ( ret < 0 ) {
515	free(ptr);
516	goto get_group;
517	}
518
519	/* flawfinder: ignore // is part of name, not access() */
520	ret = idmef_file_access_new_user_id(access, &userid);
521	if ( ret < 0 ) {
522	free(ptr);
523	goto get_group;
524	}
525	idmef_user_id_set_type(userid, IDMEF_USER_ID_TYPE_USER_PRIVS);
526
527	ret = idmef_user_id_new_name(userid, &str);
528	if ( ret < 0 ) {
529	free(ptr);
530	goto get_group;
531	}
532	prelude_string_set_nodup(str, ptr);
533
534	uid = get_value(msg, _("iowner"), suffix);
535	if ( ! uid )
536	goto get_group;
537
538	idmef_user_id_set_number(userid, strtoul(uid, NULL, 0));
539
540	if ( mode ) {
541	/* flawfinder: ignore // is part of name, not access() */
542	get_access_info ( access, mode, 1, 3 );
543	}
544
545	free(uid);
546	}
547
548	get_group:
549
550	ptr = get_value(msg, _("group"), suffix);
551	if ( ptr ) {
552	char *gid;
553
554	/* flawfinder: ignore // is part of name, not access() */
555	ret = idmef_file_new_file_access(file, &access, IDMEF_LIST_APPEND);
556	if ( ret < 0 ) {
557	free(ptr);
558	goto mode_free;
559	}
560
561	ret = idmef_file_access_new_user_id(access, &userid);/* flawfinder: ignore // is part of name, not access() */
562	if ( ret < 0 ) {
563	free(ptr);
564	goto mode_free;
565	}
566
567	idmef_user_id_set_type(userid, IDMEF_USER_ID_TYPE_GROUP_PRIVS);
568
569	ret = idmef_user_id_new_name(userid, &str);
570	if ( ret < 0 ) {
571	free(ptr);
572	goto mode_free;
573	}
574
575	prelude_string_set_nodup(str, ptr);
576
577	gid = get_value(msg, _("igroup"), suffix);
578	if ( ! gid )
579	goto mode_free;
580
581	idmef_user_id_set_number(userid, strtoul(gid, NULL, 0));
582
583	if ( mode ) {
584	get_access_info ( access, mode, 4, 6 ); /* flawfinder: ignore */
585	}
586
587	free(gid);
588	}
589
590	mode_free:
591
592	if ( mode ) {
593	free ( mode );
594	}
595
596	return;
597	}
598
599
600
601	static int map_policy_to_class(char msg, unsigned long msgid, idmef_impact_t impact, prelude_string_t *out)
602	{
603	char *ptr;
604	int ret, i;
605	struct tbl {
606	unsigned int msgid;
607	const char *name;
608	idmef_impact_type_t type;
609	} tbl[] = {
610
611	#ifdef SH_USE_UTMP
612	{ MSG_UT_LG1X, N_("User Login"), IDMEF_IMPACT_TYPE_USER },
613	{ MSG_UT_LG1A, N_("User Login"), IDMEF_IMPACT_TYPE_USER },
614	{ MSG_UT_LG1B, N_("User Login"), IDMEF_IMPACT_TYPE_USER },
615	{ MSG_UT_LG2X, N_("Multiple User Login"), IDMEF_IMPACT_TYPE_USER },
616	{ MSG_UT_LG2A, N_("Multiple User Login"), IDMEF_IMPACT_TYPE_USER },
617	{ MSG_UT_LG2B, N_("Multiple User Login"), IDMEF_IMPACT_TYPE_USER },
618	{ MSG_UT_LG3X, N_("User Logout"), IDMEF_IMPACT_TYPE_USER },
619	{ MSG_UT_LG3A, N_("User Logout"), IDMEF_IMPACT_TYPE_USER },
620	{ MSG_UT_LG3B, N_("User Logout"), IDMEF_IMPACT_TYPE_USER },
621	{ MSG_UT_LG3C, N_("User Logout"), IDMEF_IMPACT_TYPE_USER },
622	#endif
623
624	#if defined(SH_WITH_CLIENT) \|\| defined(SH_STANDALONE)
625	{ MSG_FI_MISS, N_("File Missing"), IDMEF_IMPACT_TYPE_FILE },
626	{ MSG_FI_MISS2, N_("File Missing"), IDMEF_IMPACT_TYPE_FILE },
627	{ MSG_FI_ADD, N_("File Added"), IDMEF_IMPACT_TYPE_FILE },
628	{ MSG_FI_ADD2, N_("File Added"), IDMEF_IMPACT_TYPE_FILE },
629	{ MSG_FI_CHAN, N_("File Modified"), IDMEF_IMPACT_TYPE_FILE },
630	{ MSG_FI_NODIR, N_("File found where directory was expected"), IDMEF_IMPACT_TYPE_FILE },
631	#endif
632
633	#ifdef SH_USE_KERN
634	{ MSG_KERN_POLICY, N_("Kernel Modified"), IDMEF_IMPACT_TYPE_OTHER },
635	{ MSG_KERN_POL_CO, N_("Kernel Modified"), IDMEF_IMPACT_TYPE_OTHER },
636	{ MSG_KERN_PROC, N_("Kernel Modified"), IDMEF_IMPACT_TYPE_OTHER },
637	{ MSG_KERN_GATE, N_("Kernel Modified"), IDMEF_IMPACT_TYPE_OTHER },
638	{ MSG_KERN_IDT, N_("Kernel Modified"), IDMEF_IMPACT_TYPE_OTHER },
639	{ MSG_KERN_SYSCALL, N_("Kernel Modified"), IDMEF_IMPACT_TYPE_OTHER },
640	#endif
641
642	#ifdef SH_USE_SUIDCHK
643	{ MSG_SUID_POLICY, N_("SUID/SGID File Detected"), IDMEF_IMPACT_TYPE_FILE },
644	#endif
645	/*
646	* This must be the last table entry
647	*/
648	{ 0, NULL, IDMEF_IMPACT_TYPE_OTHER },
649	};
650
651	for ( i = 0; tbl[i].name != NULL; i++ ) {
652	if ( tbl[i].msgid != msgid )
653	continue;
654
655	idmef_impact_set_type(impact, tbl[i].type);
656	return prelude_string_cat(out, _(tbl[i].name));
657	}
658
659	/* some other message
660	*/
661	ptr = get_value(msg, _("msg"), NULL);
662	if ( ! ptr ) {
663	sh_error_handle((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
664	_("could not format Samhain message"), _("map_policy_to_class"));
665	return -1;
666	}
667
668	ret = prelude_string_cat(out, ptr);
669	free(ptr);
670
671	return ret;
672	}
673
674
675
676	static int get_login_info(char msg, idmef_alert_t alert)
677	{
678	int ret;
679	char ptr, ip;
680	idmef_user_t *user;
681	idmef_node_t *node;
682	struct passwd *pw;
683	prelude_string_t *str;
684	idmef_user_id_t *user_id;
685	idmef_address_t *address;
686	idmef_target_t *target = idmef_alert_get_next_target(alert, NULL);
687	idmef_source_t *source = idmef_alert_get_next_source(alert, NULL);
688
689	ip = ptr = get_value(msg, _("ip"), NULL);
690	if ( ptr ) {
691	if ( ! source ) {
692	ret = idmef_alert_new_source(alert, &source, IDMEF_LIST_APPEND);
693	if ( ret < 0 ) {
694	free(ptr);
695	return ret;
696	}
697	}
698
699	ret = idmef_source_new_node(source, &node);
700	if ( ret < 0 ) {
701	free(ptr);
702	return ret;
703	}
704
705	ret = idmef_node_new_address(node, &address, IDMEF_LIST_APPEND);
706	if ( ret < 0 ) {
707	free(ptr);
708	return ret;
709	}
710
711	ret = idmef_address_new_address(address, &str);
712	if ( ret < 0 ) {
713	free(ptr);
714	return ret;
715	}
716
717	prelude_string_set_nodup(str, ptr);
718	}
719
720	ptr = get_value(msg, _("host"), NULL);
721	if ( ptr ) {
722	if ( ip && strcmp(ptr, ip) == 0 )
723	free(ptr);
724	else {
725	if ( ! source ) {
726	ret = idmef_alert_new_source(alert, &source, IDMEF_LIST_APPEND);
727	if ( ret < 0 ) {
728	free(ptr);
729	return ret;
730	}
731	}
732
733	ret = idmef_source_new_node(source, &node);
734	if ( ret < 0 ) {
735	free(ptr);
736	return ret;
737	}
738
739	ret = idmef_node_new_name(node, &str);
740	if ( ret < 0 ) {
741	free(ptr);
742	return ret;
743	}
744
745	prelude_string_set_nodup(str, ptr);
746	}
747	}
748
749	ptr = get_value(msg, _("name"), NULL);
750	if ( ptr ) {
751	ret = idmef_target_new_user(target, &user);
752	if ( ret < 0 ) {
753	free(ptr);
754	return ret;
755	}
756
757	idmef_user_set_category(user, IDMEF_USER_CATEGORY_OS_DEVICE);
758
759	ret = idmef_user_new_user_id(user, &user_id, IDMEF_LIST_APPEND);
760	if ( ret < 0 ) {
761	free(ptr);
762	return ret;
763	}
764
765	idmef_user_id_set_type(user_id, IDMEF_USER_ID_TYPE_TARGET_USER);
766
767	pw = getpwnam(ptr);
768	if ( pw )
769	idmef_user_id_set_number(user_id, pw->pw_uid);
770
771	ret = idmef_user_id_new_name(user_id, &str);
772	if ( ret < 0 ) {
773	free(ptr);
774	return ret;
775	}
776	prelude_string_set_nodup(str, ptr);
777
778	ptr = get_value(msg, _("tty"), NULL);
779	if ( ptr ) {
780	ret = idmef_user_id_new_tty(user_id, &str);
781	if ( ret < 0 ) {
782	free(ptr);
783	return ret;
784	}
785
786	prelude_string_set_nodup(str, ptr);
787	}
788	}
789
790	ptr = get_time_value(msg, _("time"), NULL);
791	if ( ptr ) {
792	idmef_time_t *time;
793
794	ret = idmef_time_from_samhain(&time, ptr);
795	free(ptr);
796
797	if ( ret < 0 )
798	return ret;
799
800	idmef_alert_set_detect_time(alert, time);
801	}
802
803	return 0;
804	}
805
806
807	static int samhain_alert_prelude(int priority, int sh_class,
808	char *message, unsigned long msgid)
809	{
810	int ret;
811	idmef_time_t *time;
812	idmef_alert_t *alert;
813	idmef_message_t *idmef;
814	idmef_classification_t *classification;
815	idmef_assessment_t *assessment;
816	idmef_additional_data_t *data;
817	idmef_impact_t *impact;
818	idmef_target_t *target;
819	idmef_confidence_t *confidence;
820	prelude_string_t *str;
821
822	if ( !client \|\| sh_class == STAMP)
823	return 0;
824
825	ret = idmef_message_new(&idmef);
826	if ( ret < 0 )
827	goto err;
828
829	ret = idmef_message_new_alert(idmef, &alert);
830	if ( ret < 0 )
831	goto err;
832
833	idmef_alert_set_analyzer(alert, idmef_analyzer_ref(prelude_client_get_analyzer(client)), IDMEF_LIST_PREPEND);
834
835	ret = idmef_time_new_from_gettimeofday(&time);
836	if ( ret < 0 )
837	goto err;
838	idmef_alert_set_detect_time(alert, time);
839
840	ret = idmef_time_new_from_gettimeofday(&time);
841	if ( ret < 0 )
842	goto err;
843	idmef_alert_set_create_time(alert, time);
844
845	ret = idmef_alert_new_classification(alert, &classification);
846	if ( ret < 0 )
847	goto err;
848
849	ret = idmef_alert_new_target(alert, &target, IDMEF_LIST_APPEND);
850	if ( ret < 0 )
851	goto err;
852
853	idmef_target_set_decoy(target, IDMEF_TARGET_DECOY_NO);
854
855	if ( idmef_analyzer_get_node(prelude_client_get_analyzer(client)) ) {
856	idmef_node_ref(idmef_analyzer_get_node(prelude_client_get_analyzer(client)));
857	idmef_target_set_node(target, idmef_analyzer_get_node(prelude_client_get_analyzer(client)));
858	}
859
860	if ( strstr(message, _("path=")) ) {
861	#if defined(SH_WITH_CLIENT) \|\| defined(SH_STANDALONE)
862	if ( msgid != MSG_FI_ADD && msgid != MSG_FI_ADD2 )
863	get_file_infos(target, message, IDMEF_FILE_CATEGORY_ORIGINAL);
864	#endif
865
866	get_file_infos(target, message, IDMEF_FILE_CATEGORY_CURRENT);
867	}
868
869	ret = idmef_alert_new_assessment(alert, &assessment);
870	if ( ret < 0 )
871	goto err;
872
873	ret = idmef_assessment_new_impact(assessment, &impact);
874	if ( ret < 0 )
875	goto err;
876
877	ret = idmef_classification_new_text(classification, &str);
878	if ( ret < 0 )
879	goto err;
880
881	ret = get_login_info(message, alert);
882	if ( ret < 0 )
883	goto err;
884
885	map_policy_to_class(message, msgid, impact, str);
886
887	#if 0
888	if ( priority == SH_ERR_SEVERE \|\| priority == SH_ERR_FATAL )
889	idmef_impact_set_severity(impact, IDMEF_IMPACT_SEVERITY_HIGH);
890
891	else if ( priority == SH_ERR_ALL \|\| priority == SH_ERR_INFO \|\| priority == SH_ERR_NOTICE )
892	idmef_impact_set_severity(impact, IDMEF_IMPACT_SEVERITY_LOW);
893
894	else
895	idmef_impact_set_severity(impact, IDMEF_IMPACT_SEVERITY_MEDIUM);
896	#endif
897	idmef_impact_set_severity(impact, map_severity(priority));
898
899	idmef_impact_set_completion(impact, IDMEF_IMPACT_COMPLETION_SUCCEEDED);
900
901	ret = idmef_assessment_new_confidence(assessment, &confidence);
902	if ( ret < 0 )
903	goto err;
904
905	idmef_confidence_set_rating(confidence, IDMEF_CONFIDENCE_RATING_HIGH);
906
907	ret = idmef_alert_new_additional_data(alert, &data, IDMEF_LIST_APPEND);
908	if ( ret < 0 )
909	goto err;
910
911	ret = idmef_additional_data_new_meaning(data, &str);
912	if ( ret < 0 )
913	goto err;
914
915	prelude_string_set_dup(str, _("Message generated by Samhain"));
916	idmef_additional_data_set_type(data, IDMEF_ADDITIONAL_DATA_TYPE_STRING);
917	idmef_additional_data_set_string_ref(data, message);
918
919	/* debug_print_message(idmef); */
920
921	prelude_client_send_idmef(client, idmef);
922	idmef_message_destroy(idmef);
923
924	return 0;
925
926	err:
927	idmef_message_destroy(idmef);
928	return -1;
929	}
930
931
932	int sh_prelude_alert(int priority, int sh_class, char *message, long msgflags, unsigned long msgid)
933	{
934	int ret;
935
936	(void) msgflags; /* fix compiler warning */
937
938	if ( initialized < 1 )
939	return -1;
940
941	ret = samhain_alert_prelude(priority, sh_class, message, msgid);
942	if ( ret < 0 ) {
943	sh_error_handle((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
944	_("Problem with IDMEF for prelude-ids support: alert lost"),
945	_("sh_prelude_alert"));
946	}
947
948	return ret;
949	}
950
951
952
953	int sh_prelude_set_profile(const char *arg)
954	{
955	if ( profile ) {
956	free(profile);
957	profile = NULL;
958	}
959
960	if ( arg ) {
961	profile = strdup(arg);
962	if ( ! profile )
963	return -1;
964	}
965
966	return 0;
967	}
968
969
970	void sh_prelude_reset(void)
971	{
972	extern void sh_error_init_prelude();
973
974	ready_for_init = 1;
975	sh_error_init_prelude();
976	return;
977	}
978
979
980
981	void sh_prelude_stop(void)
982	{
983	if (initialized < 1)
984	return;
985	prelude_client_destroy(client, PRELUDE_CLIENT_EXIT_STATUS_SUCCESS);
986	client = NULL;
987	initialized = 0;
988	return;
989	}
990
991
992
993	int sh_prelude_init(void)
994	{
995	int ret;
996	prelude_string_t *str;
997	idmef_analyzer_t *analyzer;
998	prelude_client_flags_t flags;
999	#ifdef SH_NOFAILOVER
1000	prelude_connection_pool_t *pool;
1001	prelude_connection_pool_flags_t conn_flags;
1002	#endif
1003
1004	if (ready_for_init == 0)
1005	return initialized;
1006
1007	if (initialized > 0)
1008	return initialized;
1009
1010	prelude_thread_init(NULL);
1011	prelude_init(&sh_argc_store, sh_argv_store);
1012
1013	ret = prelude_client_new(&client, profile ? profile : _("samhain"));
1014	if ( ret < 0 ) {
1015	sh_error_handle((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
1016	_("Failed to initialize Prelude"), _("sh_prelude_init"));
1017	initialized = -1;
1018	return -1;
1019	}
1020
1021	/*
1022	* Enable automatic heartbeat sending.
1023	*/
1024	flags = prelude_client_get_flags(client);
1025	ret = prelude_client_set_flags(client, flags \| PRELUDE_CLIENT_FLAGS_ASYNC_TIMER);
1026
1027	analyzer = prelude_client_get_analyzer(client);
1028
1029	ret = idmef_analyzer_new_model(analyzer, &str);
1030	prelude_string_set_dup(str, IDMEF_ANALYZER_MODEL);
1031
1032	ret = idmef_analyzer_new_class(analyzer, &str);
1033	prelude_string_set_dup(str, IDMEF_ANALYZER_CLASS);
1034
1035	ret = idmef_analyzer_new_version(analyzer, &str);
1036	prelude_string_set_dup(str, IDMEF_ANALYZER_VERSION);
1037
1038	#ifdef SH_NOFAILOVER
1039	pool = prelude_client_get_connection_pool(client);
1040	conn_flags = prelude_connection_pool_get_flags(pool);
1041
1042	conn_flags &= ~PRELUDE_CONNECTION_POOL_FLAGS_FAILOVER;
1043	prelude_connection_pool_set_flags(pool, conn_flags);
1044	#endif
1045
1046	ret = prelude_client_start(client);
1047	if ( ret < 0 ) {
1048	prelude_perror(ret, _("error starting prelude client"));
1049
1050	if ( prelude_client_is_setup_needed(ret) )
1051	prelude_client_print_setup_error(client);
1052
1053	sh_error_handle((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
1054	_("Failed to start Prelude"), _("sh_prelude_init"));
1055	initialized = -1;
1056	return -1;
1057	}
1058
1059	initialized = 1;
1060	return 1;
1061	}
1062
1063	/* HAVE_LIBPRELUDE_9 */
1064	#endif
1065

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