source: trunk/include/sh_unix.h@ 411

Last change on this file since 411 was 411, checked in by katerina, 12 years ago

More fixes for ticket #311 (thread safety of --enable-ptrace) and an option for setting the time difference.
File size: 10.7 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/* obtain file info
314 */
315int sh_unix_getinfo (int level, const char * filename, file_type * theFile,
316 char * fileHash, int flagrel);
317
318/* read file, return length read
319 */
320int sh_unix_getline (SL_TICKET fd, char * line, int sizeofline);
321
322/* call with goDaemon == 1 to make daemon process
323 */
324int sh_unix_init(int goDaemon);
325
326/* for local time use thetime = 0, returns pointer to buffer
327 */
328char * sh_unix_time (time_t thetime, char * buffer, size_t len);
329
330/* convert to GMT time, returns pointer to buffer
331 */
332char * sh_unix_gmttime (time_t thetime, char * buffer, size_t len);
333
334/* effective user info
335 */
336int sh_unix_getUser (void);
337
338/* get home directory, , returns pointer to out
339 */
340char * sh_unix_getUIDdir (int level, uid_t uid, char * out, size_t len);
341
342/* get a group GID
343 */
344long sh_group_to_gid (const char * g, int * fail);
345
346#ifdef HAVE_GETTIMEOFDAY
347unsigned long sh_unix_notime (void);
348#endif
349
350/* check whether a directory
351 */
352int sh_unix_isdir (char * dirName, int level);
353
354#ifdef SH_STEALTH
355int sh_unix_getline_stealth (SL_TICKET fd, char * str, int len);
356void sh_unix_xor_code (char * str, int len);
357#endif
358
359#if defined(SCREW_IT_UP)
360/* for raise()
361 */
362#include <signal.h>
363#include <errno.h>
364
365void sh_sigtrap_handler (int signum);
366
367#ifdef HAVE_GETTIMEOFDAY
368#if TIME_WITH_SYS_TIME
369#include <sys/time.h>
370#include <time.h>
371#else
372#if HAVE_SYS_TIME_H
373#include <sys/time.h>
374#else
375#include <time.h>
376#endif
377#endif
378#endif
379
380struct sh_sigtrap_variables {
381 int not_traced;
382#ifdef HAVE_GETTIMEOFDAY
383 struct timeval save_tv;
384#endif
385};
386
387struct sh_sigtrap_variables * sh_sigtrap_variables_get();
388
389int sh_sigtrap_max_duration_set (const char * str);
390
391static inline
392int sh_sigtrap_prepare()
393{
394 struct sigaction act_trap;
395 int val_retry;
396 act_trap.sa_handler = &sh_sigtrap_handler; /* signal action */
397 act_trap.sa_flags = 0; /* init sa_flags */
398 sigemptyset ( &act_trap.sa_mask ); /* set an empty mask */
399 do {
400 val_retry = sigaction(SIGTRAP, &act_trap, NULL);
401 } while (val_retry < 0 && errno == EINTR);
402 return 0;
403}
404
405/*@unused@*/ static inline
406int sh_derr(void)
407{
408 struct sh_sigtrap_variables * sigtrap_variables;
409 sigtrap_variables = sh_sigtrap_variables_get();
410 if (sigtrap_variables == NULL) {
411 /* Perhaps, its better to not die, and to continue using Samhain,
412 even if this part does not work. */
413 return (0);
414 }
415
416 sigtrap_variables->not_traced = 0;
417
418#ifdef HAVE_GETTIMEOFDAY
419 gettimeofday(&sigtrap_variables->save_tv, NULL);
420#endif
421
422 /* raise() sends to same thread, like pthread_kill(pthread_self(), sig);
423 */
424 raise(SIGTRAP);
425
426 if (sigtrap_variables->not_traced == 0)
427 _exit(5);
428
429 sigtrap_variables->not_traced = 0;
430 return (0);
431}
432
433#else
434
435/*@unused@*/ static inline
436int sh_derr(void)
437{
438 return 0;
439}
440/* #if defined(SCREW_IT_UP) */
441#endif
442
443#endif
444
445
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