source: trunk/include/samhain.h @ 481

Last change on this file since 481 was 481, checked in by katerina, 6 years ago

Enhancements and fixes for tickets #374, #375, #376, #377, #378, and #379.

File size: 15.3 KB
Line 
1/* SAMHAIN file system integrity testing                                   */
2/* Copyright (C) 1999 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#ifndef SAMHAIN_H
21#define SAMHAIN_H
22
23#include <sys/types.h>
24#include "slib.h"
25
26#ifdef SH_ENCRYPT
27#include "rijndael-api-fst.h"
28#endif
29
30#if defined(__GNUC__) && (__GNUC__ >= 4)
31#define SH_GNUC_SENTINEL __attribute__((__sentinel__))
32#else
33#define SH_GNUC_SENTINEL
34#endif
35
36#if defined(__GNUC__) && (__GNUC__ >= 3)
37#undef  SH_GNUC_PURE
38#define SH_GNUC_PURE     __attribute__((pure))
39#undef  SH_GNUC_CONST
40#define SH_GNUC_CONST    __attribute__((const))
41#undef  SH_GNUC_NORETURN
42#define SH_GNUC_NORETURN __attribute__((noreturn))
43#undef  SH_GNUC_MALLOC
44#define SH_GNUC_MALLOC   __attribute__((malloc))
45#else
46#undef  SH_GNUC_PURE
47#define SH_GNUC_PURE
48#undef  SH_GNUC_CONST
49#define SH_GNUC_CONST
50#undef  SH_GNUC_NORETURN
51#define SH_GNUC_NORETURN
52#undef  SH_GNUC_MALLOC
53#define SH_GNUC_MALLOC
54#endif
55
56/**************************************************
57 *
58 * STANDARD DEFINES
59 *
60 **************************************************/
61
62/* IPv6 */
63#if defined(HAVE_GETNAMEINFO) && defined(HAVE_GETADDRINFO)
64
65#if defined(SH_COMPILE_STATIC) && defined(__linux__)
66#undef USE_IPVX
67#define SH_SOCKMAX 1
68#else
69
70#if defined(USE_IPV4)
71#undef USE_IPVX
72#else
73#define USE_IPVX 1
74#endif
75
76#define SH_SOCKMAX 8
77#endif
78
79#else
80#undef USE_IPVX
81#define SH_SOCKMAX 1
82#endif
83
84/* end IPv6 */
85
86/* Standard buffer sizes.
87 * IPv6 is 8 groups of 4 hex digits seperated by colons.
88 */
89#define SH_IP_BUF        48
90#define SH_MINIBUF       64
91#define SH_BUFSIZE     1024
92#define SH_MAXBUF      4096
93#define SH_PATHBUF      256
94#define SH_MSG_BUF    64512
95
96#define SH_ERRBUF_SIZE   64
97
98/* MAX_PATH_STORE must be >= KEY_LEN
99 */
100#define MAX_PATH_STORE 12287
101
102/* Sizes for arrays (user, group, timestamp).
103 */
104#define SOCKPASS_MAX 14
105#define USER_MAX     20
106#define GROUP_MAX    20
107#define TIM_MAX      32
108
109#define CMODE_SIZE   11
110
111#define ATTRBUF_SIZE 16
112#define ATTRBUF_USED 12
113
114/* The number of bytes in a key, 
115 * the number of chars in its hex repesentation,
116 * and the block size of the hash algorithm.
117 */
118#define KEY_BYT   24
119#define KEY_LEN   48
120#define KEY_BLOCK 24
121#define KEYBUF_SIZE (KEY_LEN+1)
122
123/* The length of the compiled-in password.
124 */
125#define PW_LEN     8
126
127#undef  S_TRUE
128#define S_TRUE    1
129#undef  S_FALSE
130#define S_FALSE   0
131
132#undef  GOOD
133#define GOOD  S_TRUE
134#undef  BAD
135#define BAD   S_FALSE
136
137
138#ifdef HAVE_INTTYPES_H
139#include <inttypes.h>
140#endif
141#ifdef HAVE_STDINT_H
142#include <stdint.h>
143#endif
144
145#if !defined(HAVE_UINT16_T)
146#define UINT16 unsigned short
147#else
148#define UINT16 uint16_t
149#endif
150
151#if !defined(HAVE_UINT32_T)
152
153/* An unsigned integer guaranteed to be 32 bit.
154 */
155#if defined(HAVE_INT_32)
156#define UINT32 unsigned int
157#define SINT32 int
158#elif defined(HAVE_LONG_32)
159#define UINT32 unsigned long
160#define SINT32 long
161#elif defined(HAVE_SHORT_32)
162#define UINT32 unsigned short
163#define SINT32 short
164#else
165#error "No 32 bit integer type found"
166#endif
167
168#else
169#define UINT32 uint32_t
170#define SINT32 int32_t
171
172#endif
173
174#if !defined(HAVE_UINT64_T)
175
176#ifdef HAVE_LONG_LONG_64
177#define  UINT64 unsigned long long
178#else
179#ifdef HAVE_LONG_64
180#define  UINT64 unsigned long
181#else
182#error "no 64bit type found"
183#endif
184#endif
185
186#else
187#define  UINT64 uint64_t
188#endif
189
190
191
192#define UBYTE unsigned char
193
194enum {
195  SH_TIGER192    = 0, 
196  SH_SHA1        = 1,
197  SH_MD5         = 2,
198  SH_SHA256      = 3
199};
200
201
202enum {
203  SH_CHECK_NONE    = 0, 
204  SH_CHECK_INIT    = 1,
205  SH_CHECK_CHECK   = 2
206};
207
208#define SH_MOD_THREAD  1
209#define SH_MOD_ACTIVE  0
210#define SH_MOD_FAILED -1
211#define SH_MOD_OFFSET 10
212
213/* Flags for file status
214 */
215#define SH_FFLAG_ALLIGNORE (1<<0)
216#define SH_FFLAG_VISITED   (1<<1)
217#define SH_FFLAG_CHECKED   (1<<3)
218#define SH_FFLAG_REPORTED  (1<<3)
219#define SH_FFLAG_SUIDCHK   (1<<4)
220#define SH_FFLAG_ENOENT    (1<<5)
221
222#define SH_FFLAG_ALLIGNORE_SET(a)   (((a) & SH_FFLAG_ALLIGNORE) != 0)
223#define SET_SH_FFLAG_ALLIGNORE(a)   ((a) |= SH_FFLAG_ALLIGNORE)
224#define CLEAR_SH_FFLAG_ALLIGNORE(a) ((a) &= ~SH_FFLAG_ALLIGNORE)
225
226#define SH_FFLAG_VISITED_SET(a)     (((a) & SH_FFLAG_VISITED) != 0)
227#define SET_SH_FFLAG_VISITED(a)     ((a) |= SH_FFLAG_VISITED)
228#define CLEAR_SH_FFLAG_VISITED(a)   ((a) &= ~SH_FFLAG_VISITED)
229
230#define SH_FFLAG_CHECKED_SET(a)     (((a) & SH_FFLAG_VISITED) != 0)
231#define SET_SH_FFLAG_CHECKED(a)     ((a) |= SH_FFLAG_VISITED)
232#define CLEAR_SH_FFLAG_CHECKED(a)   ((a) &= ~SH_FFLAG_VISITED)
233
234#define SH_FFLAG_REPORTED_SET(a)    (((a) & SH_FFLAG_REPORTED) != 0)
235#define SET_SH_FFLAG_REPORTED(a)    ((a) |= SH_FFLAG_REPORTED)
236#define CLEAR_SH_FFLAG_REPORTED(a)  ((a) &= ~SH_FFLAG_REPORTED)
237
238#define SH_FFLAG_SUIDCHK_SET(a)     (((a) & SH_FFLAG_SUIDCHK) != 0)
239#define SET_SH_FFLAG_SUIDCHK(a)     ((a) |= SH_FFLAG_SUIDCHK)
240#define CLEAR_SH_FFLAG_SUIDCHK(a)   ((a) &= ~SH_FFLAG_SUIDCHK)
241
242#define SH_FFLAG_ENOENT_SET(a)      (((a) & SH_FFLAG_ENOENT) != 0)
243#define SET_SH_FFLAG_ENOENT(a)      ((a) |= SH_FFLAG_ENOENT)
244#define CLEAR_SH_FFLAG_ENOENT(a)    ((a) &= ~SH_FFLAG_ENOENT)
245
246/* Flags for inotify
247 */
248#define SH_INOTIFY_USE      (1<<0)
249#define SH_INOTIFY_DOSCAN   (1<<1)
250#define SH_INOTIFY_NEEDINIT (1<<2)
251#define SH_INOTIFY_INSCAN   (1<<3)
252#define SH_INOTIFY_IFUSED(a)   if ((sh.flag.inotify & SH_INOTIFY_USE) != 0) { a }
253
254
255/**************************************************
256 *
257 * TYPEDEFS
258 *
259 **************************************************/
260
261enum {
262  SH_LEVEL_READONLY    = 1, 
263  SH_LEVEL_LOGFILES    = 2,
264  SH_LEVEL_LOGGROW     = 3,
265  SH_LEVEL_NOIGNORE    = 4,
266  SH_LEVEL_ALLIGNORE   = 5,
267  SH_LEVEL_ATTRIBUTES  = 6,
268  SH_LEVEL_USER0       = 7,
269  SH_LEVEL_USER1       = 8,
270  SH_LEVEL_USER2       = 9,
271  SH_LEVEL_USER3       = 10,
272  SH_LEVEL_USER4       = 11,
273  SH_LEVEL_PRELINK     = 12
274};
275
276typedef struct {
277  time_t  alarm_interval;
278  time_t  alarm_last;
279} sh_timer_t;
280
281typedef struct {
282  char   path[SH_PATHBUF];
283  char   hash[KEY_LEN+1];
284} sh_sh_df;
285
286typedef struct {
287  char   user[USER_MAX];
288  char   group[GROUP_MAX];
289  char   home[SH_PATHBUF];
290  uid_t  uid;
291  gid_t  gid;
292} sh_sh_user;
293
294typedef struct {
295  char   name[SH_PATHBUF];      /* local hostname                  */
296  char   system[SH_MINIBUF];    /* system                          */
297  char   release[SH_MINIBUF];   /* release                         */
298  char   machine[SH_MINIBUF];   /* machine                         */
299} sh_sh_local;
300
301typedef struct {
302  char   name[SH_PATHBUF];
303  char   alt[SH_PATHBUF];
304} sh_sh_remote;
305
306typedef struct {
307  unsigned long   bytes_hashed;  /* bytes     last check */
308  unsigned long   bytes_speed;   /* bytes/sec last check */
309  unsigned long   mail_success;  /* mails sent           */ 
310  unsigned long   mail_failed;   /* mails not sent       */
311  time_t          time_start;    /* start     last check */
312  time_t          time_check;    /* time      last check */
313  unsigned long   dirs_checked;  /* #dirs     last check */
314  unsigned long   files_checked; /* #files    last check */
315  unsigned long   files_report;  /* #file reports        */
316  unsigned long   files_error;   /* #file access error   */
317  unsigned long   files_nodir;   /* #file not a directory*/
318} sh_sh_stat;
319
320typedef struct {
321  int    exit;                     /* exit value                      */
322  int    checkSum;                 /* whether to init/check checksums */
323  int    update;                   /* update db                       */
324  int    opts;                     /* reading cl options              */
325  int    started;                  /* finished with startup stuff     */
326  int    isdaemon;                 /* daemon or not                   */
327  int    loop;                     /* go in loop even if not daemon   */
328  int    nice;                     /* desired nicety                  */
329  int    isserver;                 /* server or not                   */
330  int    islocked;                 /* BAD if logfile not locked       */
331  int    smsg;                     /* GOOD if end message sent        */
332  int    log_start;                /* TRUE if new audit trail         */
333  int    reportonce;               /* TRUE if bad files only once rep.*/
334  int    fulldetail;               /* TRUE if full details requested  */
335  int    client_severity;          /* TRUE if client severity used    */
336  int    client_class;             /* TRUE if client class used       */
337  int    hidefile;                 /* TRUE if file not shown in log   */
338  int    inotify;                  /* Flags for inotify               */
339  int    audit;
340  unsigned long aud_mask;
341} sh_sh_flag;
342
343typedef struct {
344
345  char   prg_name[8];
346
347  UINT64 pid; 
348 
349  sh_sh_df     exec;
350  sh_sh_df     conf;
351  sh_sh_df     data;
352
353  sh_sh_user   real;
354  sh_sh_user   effective;
355  sh_sh_user   run;
356
357  sh_sh_local  host;
358
359  sh_sh_remote srvtime;
360  sh_sh_remote srvmail;
361  sh_sh_remote srvexport;
362  sh_sh_remote srvcons;
363  sh_sh_remote srvlog;
364
365  sh_sh_stat   statistics;
366  sh_sh_flag   flag;
367
368#ifdef SH_STEALTH
369  unsigned long off_data;
370#endif
371
372  sh_timer_t mailNum;
373  sh_timer_t mailTime;
374  sh_timer_t fileCheck;
375
376  int    looptime;                 /* timing for main loop            */
377  /*@null@*//*@out@*/ char   * timezone;
378
379  int delayload;
380
381#ifdef SCREW_IT_UP
382  int sigtrap_max_duration;
383#endif
384
385  char * outpath;
386} sh_struct;
387
388
389extern volatile  int      sig_raised;
390extern volatile  int      sig_urgent;
391extern volatile  int      sig_debug_switch;       /* SIGUSR1 */
392extern volatile  int      sig_suspend_switch;     /* SIGUSR2 */
393extern volatile  int      sh_global_suspend_flag;
394extern volatile  int      sig_fresh_trail;        /* SIGIOT  */
395extern volatile  int      sh_thread_pause_flag;
396extern volatile  int      sig_config_read_again;  /* SIGHUP  */
397extern volatile  int      sig_terminate;          /* SIGQUIT */
398extern volatile  int      sig_termfast;           /* SIGTERM */
399extern volatile  int      sig_force_check;        /* SIGTTOU */
400extern volatile  int      sh_load_delta_flag;
401
402extern long int eintr__result;
403
404extern int     sh_argc_store;
405extern char ** sh_argv_store;
406
407#include "sh_calls.h"
408
409
410typedef struct {
411  char   sh_sockpass[2*SOCKPASS_MAX+2];
412  char   sigkey_old[KEY_LEN+1];
413  char   sigkey_new[KEY_LEN+1];
414  char   mailkey_old[KEY_LEN+1];
415  char   mailkey_new[KEY_LEN+1];
416  char   crypt[KEY_LEN+1]; 
417  char   session[KEY_LEN+1]; 
418  char   vernam[KEY_LEN+1];
419  int    mlock_failed;
420
421  char   pw[PW_LEN];
422
423  char   poolv[KEY_BYT];
424  int    poolc;
425
426  int    rngI;
427  UINT32 rng0[3];
428  UINT32 rng1[3];
429  UINT32 rng2[3];
430
431  UINT32 res_vec[6];
432
433  UINT32 ErrFlag[2];
434
435#ifdef SH_ENCRYPT
436  /*@out@*/ keyInstance             keyInstE;
437  /*@out@*/ keyInstance             keyInstD;
438#endif
439} sh_key_t;
440
441extern sh_struct sh; 
442/*@null@*/ extern sh_key_t  *skey; 
443
444/**************************************************
445 *
446 * macros
447 *
448 **************************************************/
449
450#if defined(SH_ABORT_ON_ERROR)
451#define SH_ABORT abort()
452#else
453#define SH_ABORT
454#endif
455
456
457
458/* The semantics of the built-in are that it is expected that expr == const
459 * for __builtin_expect ((expr), const)
460 */
461#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
462#define SH_LIKELY(expr)   (__builtin_expect((expr), 1))
463#define SH_UNLIKELY(expr) (__builtin_expect((expr), 0))
464#else
465#define SH_LIKELY(expr) (expr)
466#define SH_UNLIKELY(expr) (expr)
467#endif
468
469/* signal-safe log function
470 */
471int  safe_logger (int thesignal, int method, char * details);
472void safe_fatal  (const char * details, const char *f, int l);
473
474#define SH_VALIDATE_EQ(a,b) \
475     do { \
476         if ((a) != (b)) safe_fatal(#a " != " #b, FIL__, __LINE__);\
477     } while (0)
478
479#define SH_VALIDATE_NE(a,b) \
480     do { \
481         if ((a) == (b)) safe_fatal(#a " == " #b, FIL__, __LINE__);\
482     } while (0)
483
484#define SH_VALIDATE_GE(a,b) \
485     do { \
486         if ((a) < (b)) safe_fatal(#a " < " #b, FIL__, __LINE__);\
487     } while (0)
488
489#if defined(HAVE_MLOCK) && !defined(HAVE_BROKEN_MLOCK)
490#ifdef USE_SUID
491#define MLOCK(a, b) \
492      if ((skey != NULL) && skey->mlock_failed == S_FALSE){ \
493        (void) sl_set_suid(); \
494        if (sh_unix_mlock(FIL__, __LINE__, a, b) < 0) skey->mlock_failed = S_TRUE; \
495        (void) sl_unset_suid(); }
496#else
497#define MLOCK(a, b) \
498      if ((skey != NULL) && skey->mlock_failed == S_FALSE){ \
499        if (sh_unix_mlock(FIL__, __LINE__, a, b) < 0) skey->mlock_failed = S_TRUE; }
500#endif
501#else
502#define MLOCK(a, b) \
503  ;
504#endif
505
506#if defined(HAVE_MLOCK) && !defined(HAVE_BROKEN_MLOCK)
507#ifdef USE_SUID
508#define MUNLOCK(a, b) \
509      if ((skey != NULL) && skey->mlock_failed == S_FALSE){ \
510        (void) sl_set_suid(); \
511        (void) sh_unix_munlock( a, b );\
512        (void) sl_unset_suid(); }
513#else
514#define MUNLOCK(a, b) \
515      if ((skey != NULL) && skey->mlock_failed == S_FALSE){ \
516        (void) sh_unix_munlock( a, b ); }
517#endif
518#else
519#define MUNLOCK(a, b) \
520  ;
521#endif
522
523#ifdef SH_STEALTH
524void sh_do_encode (char * str, int len);
525#define sh_do_decode sh_do_encode
526#endif
527
528/* #if defined(SCREW_IT_UP)
529 * extern volatile int sh_not_traced;
530 * inline int  sh_sigtrap_prepare();
531 * inline int  sh_derr();
532 * #endif
533 */
534
535#if defined(SCREW_IT_UP) && (defined(__FreeBSD__) || defined(__linux__)) && defined(__i386__)
536#define BREAKEXIT(expr) \
537  do { \
538    int ixi; \
539    for (ixi = 0; ixi < 8; ++ixi) { \
540      if ((*(volatile unsigned *)((unsigned) expr + ixi) & 0xff) == 0xcc) \
541        _exit(EXIT_FAILURE); \
542      } \
543    } \
544  while (1 == 0)
545#else
546#define BREAKEXIT(expr)
547#endif
548 
549
550
551#include "sh_cat.h"
552#include "sh_trace.h"
553#include "sh_mem.h"
554
555#endif
556
557/* CRIT:                                       */
558/* NEW_CLIENT  <client>                        */
559/* BAD_CLIENT  <client> -- <details>           */
560/* ERR_CLIENT  <client> -- <details>           */
561
562/* ALERT:                                      */
563/* LOG_KEY     samhain|yule <key>              */
564/* STARTUP     samhain|yule -- user <username> */
565/* EXIT        samhain|yule                    */
566/* GOODSIG     <file> <user>                   */
567/* FP_KEY      <fingerprint>                   */
568/* GOODSIG_DAT <file> <user>                   */
569/* FP_KEY_DAT  <fingerprint>                   */
570/* TIGER_CFG   <file> <checksum>               */
571/* TIGER_DAT   <file> <checksum>               */
572
573/* PANIC       -- <details>                    */
574/* ERROR       -- <details>                    */
575
576/* Policy                                      */
577/* POLICY      <code> <file>                   */
578/* <code> = MISSING || ADDED || NOT_A_DIRECTORY || <policy> */
579
580
581
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