source: trunk/include/sh_unix.h@ 427

Last change on this file since 427 was 425, checked in by katerina, 12 years ago

Fix for tickets #329, #330, #331, #332
File size: 10.8 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
21
22#ifndef SH_UNIX_H
23#define SH_UNIX_H
24
25/* For PATH_MAX */
26#include <limits.h>
27#if !defined(PATH_MAX)
28#define PATH_MAX 1024
29#endif
30
31#include <unistd.h>
32#include "samhain.h"
33#include "sh_error.h"
34
35
36typedef enum {
37 SH_ISLOG,
38 SH_ISFILE,
39 SH_ISDIR,
40 SH_ISDATA
41} ShOpenType;
42
43typedef enum {
44 SH_DATA_RAW,
45 SH_DATA_LINE
46} ShDataType;
47
48typedef enum {
49 SH_FILE_REGULAR,
50 SH_FILE_SYMLINK,
51 SH_FILE_DIRECTORY,
52 SH_FILE_CDEV,
53 SH_FILE_BDEV,
54 SH_FILE_FIFO,
55 SH_FILE_SOCKET,
56 SH_FILE_DOOR,
57 SH_FILE_PORT,
58 SH_FILE_UNKNOWN
59} ShFileType;
60
61/* -- Attributes to check. --
62 */
63
64/* checksum */
65#define MODI_CHK (1 << 0)
66/* link */
67#define MODI_LNK (1 << 1)
68/* inode */
69#define MODI_INO (1 << 2)
70/* user */
71#define MODI_USR (1 << 3)
72/* group */
73#define MODI_GRP (1 << 4)
74/* mtime */
75#define MODI_MTM (1 << 5)
76/* ctime */
77#define MODI_CTM (1 << 6)
78/* atime */
79#define MODI_ATM (1 << 7)
80/* size */
81#define MODI_SIZ (1 << 8)
82/* file mode */
83#define MODI_MOD (1 << 9)
84/* hardlinks */
85#define MODI_HLN (1 << 10)
86/* device type */
87#define MODI_RDEV (1 << 11)
88/* size may grow */
89#define MODI_SGROW (1 << 12)
90/* use prelink */
91#define MODI_PREL (1 << 13)
92
93/* get content */
94#define MODI_TXT ((1 << 14)|MODI_CHK)
95#define MODI_TXT_ENABLED(a) (((a)&(1 << 14))!=0)
96
97/* get audit record */
98#define MODI_AUDIT (1 << 15)
99#define MODI_AUDIT_ENABLED(a) (((a)&(1 << 15))!=0)
100
101#define MODI_INIT 0xDA000000UL
102#define MODI_INITIALIZED(a) (((a) & 0xFF000000UL) == MODI_INIT)
103
104#define SH_TXT_MAX 9200
105
106#define MASK_ALLIGNORE_ 0
107extern unsigned long mask_ALLIGNORE;
108#define MASK_ATTRIBUTES_ (MODI_MOD|MODI_USR|MODI_GRP|MODI_RDEV)
109extern unsigned long mask_ATTRIBUTES;
110#define MASK_LOGFILES_ (MASK_ATTRIBUTES_|MODI_HLN|MODI_LNK|MODI_INO)
111extern unsigned long mask_LOGFILES;
112#define MASK_LOGGROW_ (MASK_LOGFILES_|MODI_SIZ|MODI_SGROW|MODI_CHK)
113extern unsigned long mask_LOGGROW;
114#define MASK_READONLY_ (MASK_LOGFILES_|MODI_CHK|MODI_SIZ|MODI_MTM|MODI_CTM)
115extern unsigned long mask_READONLY;
116#define MASK_NOIGNORE_ (MASK_LOGFILES_|MODI_CHK|MODI_SIZ|MODI_ATM|MODI_MTM)
117extern unsigned long mask_NOIGNORE;
118#define MASK_USER_ (MASK_READONLY_|MODI_ATM)
119extern unsigned long mask_USER0;
120extern unsigned long mask_USER1;
121extern unsigned long mask_USER2;
122extern unsigned long mask_USER3;
123extern unsigned long mask_USER4;
124/* like READONLY, but without MTM,CTM,SIZ,INO, and with PREL)
125 */
126#define MASK_PRELINK_ (MASK_ATTRIBUTES_|MODI_HLN|MODI_LNK|MODI_CHK|MODI_PREL)
127extern unsigned long mask_PRELINK;
128
129typedef struct file_struct {
130 unsigned long check_mask;
131 int file_reported;
132 char fullpath[PATH_MAX];
133 ShFileType type;
134 dev_t dev;
135 ino_t ino;
136 mode_t mode;
137 nlink_t hardlinks;
138#if defined(__linux__) || defined(HAVE_STAT_FLAGS)
139 unsigned long attributes;
140 char c_attributes[ATTRBUF_SIZE];
141#endif
142 char c_mode[CMODE_SIZE];
143 uid_t owner;
144 char c_owner[USER_MAX+2];
145 gid_t group;
146 char c_group[GROUP_MAX+2];
147 dev_t rdev;
148 off_t size;
149 unsigned long blksize;
150 unsigned long blocks;
151 time_t atime;
152 time_t mtime;
153 time_t ctime;
154
155 char * link_path;
156 mode_t linkmode;
157 char link_c_mode[11];
158 int linkisok;
159 char * attr_string;
160} file_type;
161
162extern int sh_unix_check_selinux;
163extern int sh_unix_check_acl;
164
165/* destroy userid cache
166 */
167void sh_userid_destroy ();
168
169/* --- run a command, securely ---
170 */
171int sh_unix_run_command (const char * str);
172
173/* Ignore SIGPIPE
174 */
175void sh_unix_ign_sigpipe();
176
177/* mlock utilities
178 */
179int sh_unix_mlock(const char * file, int line, void * addr, size_t len);
180int sh_unix_munlock(void * addr, size_t len);
181int sh_unix_count_mlock(void);
182/* public for unit tests */
183int sh_unix_pagesize(void);
184unsigned long sh_unix_lookup_page(void * in_addr, size_t len, int * num_pages);
185
186/* chroot directory
187 */
188int sh_unix_set_chroot(const char * str);
189
190/* whether to use localtime for file timesatams in logs
191 */
192int sh_unix_uselocaltime (const char * c);
193
194/* whether to perform selinux/acl checks
195 */
196#ifdef USE_XATTR
197int sh_unix_setcheckselinux (const char * c);
198#endif
199#ifdef USE_ACL
200int sh_unix_setcheckacl (const char * c);
201#endif
202
203/* set I/O limit
204 */
205int sh_unix_set_io_limit (const char * c);
206void sh_unix_io_pause (void);
207
208/* get file type
209 */
210int sh_unix_get_ftype(char * fullpath);
211
212/* reset masks for policies
213 */
214int sh_unix_maskreset(void);
215
216/* return true if database is remote
217 */
218int file_is_remote (void);
219
220/* return the path to the configuration/database file
221 */
222char * file_path(char what, char flag);
223
224/* return current time as unsigned long
225 */
226unsigned long sh_unix_longtime (void);
227
228/* close all files >= fd, except possibly one
229 */
230void sh_unix_closeall (int fd, int except, int inchild);
231
232/* Check whether directory for pid file exists
233 */
234int sh_unix_check_piddir (char * pidpath);
235
236/* write lock for filename
237 */
238int sh_unix_write_lock_file(char * filename);
239
240/* rm lock(s) for log file(s)
241 */
242int sh_unix_rm_lock_file(char * filename);
243
244/* write the PID file
245 */
246int sh_unix_write_pid_file(void);
247
248/* rm the PID file
249 */
250int sh_unix_rm_pid_file(void);
251
252
253/* checksum of own binary
254 */
255int sh_unix_self_hash (const char * c);
256
257/* return BAD on failure
258 */
259int sh_unix_self_check (void);
260
261/* add a trusted user to the list
262 */
263int tf_add_trusted_user(const char *);
264
265/* check a file
266 */
267int tf_trust_check (const char * file, int mode);
268
269/* initialize group vector
270 */
271#ifdef HOST_IS_OSF
272int sh_unix_initgroups ( char * in_user, gid_t in_gid);
273#else
274int sh_unix_initgroups (const char * in_user, gid_t in_gid);
275#endif
276int sh_unix_initgroups2 (uid_t in_pid, gid_t in_gid);
277
278/* set the timeserver address
279 */
280int sh_unix_settimeserver (const char * address);
281void reset_count_dev_time(void);
282
283/* lock the key
284 */
285void sh_unix_memlock(void);
286
287/* deamon mode
288 */
289int sh_unix_setdeamon (const char * dummy);
290int sh_unix_setnodeamon(const char * dummy);
291
292/* Test whether file exists
293 */
294int sh_unix_file_exists(char * path);
295
296/* test whether file exists with proper attributes
297 */
298int sh_unix_device_readable(int fd);
299
300/* local host
301 */
302void sh_unix_localhost(void);
303
304/* check whether /proc exists and is a proc filesystem
305 */
306int sh_unix_test_proc(void);
307
308/* check whether a directory is secure
309 * (no symlink in path, not world-writeable)
310 */
311/* int sh_unix_is_secure_dir (ShErrLevel level, char * tmp); */
312
313/* check whether there's a rotated log with the correct inode and checksum
314 */
315int sh_check_rotated_log (const char * path,
316 UINT64 old_size, UINT64 old_inode, const char * old_hash);
317
318/* obtain file info
319 */
320int sh_unix_getinfo (int level, const char * filename, file_type * theFile,
321 char * fileHash, int flagrel);
322
323/* read file, return length read
324 */
325int sh_unix_getline (SL_TICKET fd, char * line, int sizeofline);
326
327/* call with goDaemon == 1 to make daemon process
328 */
329int sh_unix_init(int goDaemon);
330
331/* for local time use thetime = 0, returns pointer to buffer
332 */
333char * sh_unix_time (time_t thetime, char * buffer, size_t len);
334
335/* convert to GMT time, returns pointer to buffer
336 */
337char * sh_unix_gmttime (time_t thetime, char * buffer, size_t len);
338
339/* effective user info
340 */
341int sh_unix_getUser (void);
342
343/* get home directory, , returns pointer to out
344 */
345char * sh_unix_getUIDdir (int level, uid_t uid, char * out, size_t len);
346
347/* get a group GID
348 */
349long sh_group_to_gid (const char * g, int * fail);
350
351#ifdef HAVE_GETTIMEOFDAY
352unsigned long sh_unix_notime (void);
353#endif
354
355/* check whether a directory
356 */
357int sh_unix_isdir (char * dirName, int level);
358
359#ifdef SH_STEALTH
360int sh_unix_getline_stealth (SL_TICKET fd, char * str, int len);
361void sh_unix_xor_code (char * str, int len);
362#endif
363
364#if defined(SCREW_IT_UP)
365/* for raise()
366 */
367#include <signal.h>
368#include <errno.h>
369
370void sh_sigtrap_handler (int signum);
371
372#ifdef HAVE_GETTIMEOFDAY
373#if TIME_WITH_SYS_TIME
374#include <sys/time.h>
375#include <time.h>
376#else
377#if HAVE_SYS_TIME_H
378#include <sys/time.h>
379#else
380#include <time.h>
381#endif
382#endif
383#endif
384
385struct sh_sigtrap_variables {
386 int not_traced;
387#ifdef HAVE_GETTIMEOFDAY
388 struct timeval save_tv;
389#endif
390};
391
392struct sh_sigtrap_variables * sh_sigtrap_variables_get();
393
394int sh_sigtrap_max_duration_set (const char * str);
395
396static inline
397int sh_sigtrap_prepare()
398{
399 struct sigaction act_trap;
400 int val_retry;
401 act_trap.sa_handler = &sh_sigtrap_handler; /* signal action */
402 act_trap.sa_flags = 0; /* init sa_flags */
403 sigemptyset ( &act_trap.sa_mask ); /* set an empty mask */
404 do {
405 val_retry = sigaction(SIGTRAP, &act_trap, NULL);
406 } while (val_retry < 0 && errno == EINTR);
407 return 0;
408}
409
410/*@unused@*/ static inline
411int sh_derr(void)
412{
413 struct sh_sigtrap_variables * sigtrap_variables;
414 sigtrap_variables = sh_sigtrap_variables_get();
415 if (sigtrap_variables == NULL) {
416 /* Perhaps, its better to not die, and to continue using Samhain,
417 even if this part does not work. */
418 return (0);
419 }
420
421 sigtrap_variables->not_traced = 0;
422
423#ifdef HAVE_GETTIMEOFDAY
424 gettimeofday(&sigtrap_variables->save_tv, NULL);
425#endif
426
427 /* raise() sends to same thread, like pthread_kill(pthread_self(), sig);
428 */
429 raise(SIGTRAP);
430
431 if (sigtrap_variables->not_traced == 0)
432 _exit(5);
433
434 sigtrap_variables->not_traced = 0;
435 return (0);
436}
437
438#else
439
440/*@unused@*/ static inline
441int sh_derr(void)
442{
443 return 0;
444}
445/* #if defined(SCREW_IT_UP) */
446#endif
447
448#endif
449
450
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