source: trunk/include/sh_unix.h@ 224

Last change on this file since 224 was 197, checked in by katerina, 16 years ago

Rewrite of code for conditionals in configuration file, supports more tests now (ticket #129).
File size: 9.7 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/* get content */
93#define MODI_TXT ((1 << 14)|MODI_CHK)
94
95#define MODI_TXT_ENABLED(a) (((a)&(1 << 14))!=0)
96
97#define SH_TXT_MAX 9200
98
99#define MASK_ALLIGNORE_ 0
100extern unsigned long mask_ALLIGNORE;
101#define MASK_ATTRIBUTES_ (MODI_MOD|MODI_USR|MODI_GRP|MODI_RDEV)
102extern unsigned long mask_ATTRIBUTES;
103#define MASK_LOGFILES_ (MASK_ATTRIBUTES_|MODI_HLN|MODI_LNK|MODI_INO)
104extern unsigned long mask_LOGFILES;
105#define MASK_LOGGROW_ (MASK_LOGFILES_|MODI_SIZ|MODI_SGROW|MODI_CHK)
106extern unsigned long mask_LOGGROW;
107#define MASK_READONLY_ (MASK_LOGFILES_|MODI_CHK|MODI_SIZ|MODI_MTM|MODI_CTM)
108extern unsigned long mask_READONLY;
109#define MASK_NOIGNORE_ (MASK_LOGFILES_|MODI_CHK|MODI_SIZ|MODI_ATM|MODI_MTM)
110extern unsigned long mask_NOIGNORE;
111#define MASK_USER_ (MASK_READONLY_|MODI_ATM)
112extern unsigned long mask_USER0;
113extern unsigned long mask_USER1;
114extern unsigned long mask_USER2;
115extern unsigned long mask_USER3;
116extern unsigned long mask_USER4;
117/* like READONLY, but without MTM,CTM,SIZ,INO, abd with PREL)
118 */
119#define MASK_PRELINK_ (MASK_ATTRIBUTES_|MODI_HLN|MODI_LNK|MODI_CHK|MODI_PREL)
120extern unsigned long mask_PRELINK;
121
122typedef struct file_struct {
123 unsigned long check_mask;
124 int file_reported;
125 char fullpath[PATH_MAX];
126 ShFileType type;
127 dev_t dev;
128 ino_t ino;
129 mode_t mode;
130 nlink_t hardlinks;
131#if defined(__linux__) || defined(HAVE_STAT_FLAGS)
132 unsigned long attributes;
133 char c_attributes[ATTRBUF_SIZE];
134#endif
135 char c_mode[CMODE_SIZE];
136 uid_t owner;
137 char c_owner[USER_MAX+2];
138 gid_t group;
139 char c_group[GROUP_MAX+2];
140 dev_t rdev;
141 off_t size;
142 unsigned long blksize;
143 unsigned long blocks;
144 time_t atime;
145 time_t mtime;
146 time_t ctime;
147
148 char * link_path;
149 mode_t linkmode;
150 char link_c_mode[11];
151 int linkisok;
152 char * attr_string;
153} file_type;
154
155extern int sh_unix_check_selinux;
156extern int sh_unix_check_acl;
157
158/* --- run a command, securely ---
159 */
160int sh_unix_run_command (const char * str);
161
162/* mlock utilities
163 */
164int sh_unix_mlock(const char * file, int line, void * addr, size_t len);
165int sh_unix_munlock(void * addr, size_t len);
166int sh_unix_count_mlock(void);
167/* public for unit tests */
168int sh_unix_pagesize(void);
169unsigned long sh_unix_lookup_page(void * in_addr, size_t len, int * num_pages);
170
171/* chroot directory
172 */
173int sh_unix_set_chroot(const char * str);
174
175/* whether to use localtime for file timesatams in logs
176 */
177int sh_unix_uselocaltime (const char * c);
178
179/* whether to perform selinux/acl checks
180 */
181#ifdef USE_XATTR
182int sh_unix_setcheckselinux (const char * c);
183#endif
184#ifdef USE_ACL
185int sh_unix_setcheckacl (const char * c);
186#endif
187
188/* set I/O limit
189 */
190int sh_unix_set_io_limit (const char * c);
191void sh_unix_io_pause (void);
192
193/* get file type
194 */
195int sh_unix_get_ftype(char * fullpath);
196
197/* reset masks for policies
198 */
199int sh_unix_maskreset(void);
200
201/* return true if database is remote
202 */
203int file_is_remote (void);
204
205/* return the path to the configuration/database file
206 */
207char * file_path(char what, char flag);
208
209/* return current time as unsigned long
210 */
211unsigned long sh_unix_longtime (void);
212
213/* close all files >= fd, except possibly one
214 */
215void sh_unix_closeall (int fd, int except, int inchild);
216
217
218/* write lock for filename
219 */
220int sh_unix_write_lock_file(char * filename);
221
222/* rm lock(s) for log file(s)
223 */
224int sh_unix_rm_lock_file(char * filename);
225
226/* write the PID file
227 */
228int sh_unix_write_pid_file(void);
229
230/* rm the PID file
231 */
232int sh_unix_rm_pid_file(void);
233
234
235/* checksum of own binary
236 */
237int sh_unix_self_hash (const char * c);
238
239/* return BAD on failure
240 */
241int sh_unix_self_check (void);
242
243/* add a trusted user to the list
244 */
245int tf_add_trusted_user(const char *);
246
247/* check a file
248 */
249int tf_trust_check (const char * file, int mode);
250
251/* initialize group vector
252 */
253#ifdef HOST_IS_OSF
254int sh_unix_initgroups ( char * in_user, gid_t in_gid);
255#else
256int sh_unix_initgroups (const char * in_user, gid_t in_gid);
257#endif
258int sh_unix_initgroups2 (uid_t in_pid, gid_t in_gid);
259
260/* set the timeserver address
261 */
262int sh_unix_settimeserver (const char * address);
263void reset_count_dev_time(void);
264
265/* lock the key
266 */
267void sh_unix_memlock(void);
268
269/* deamon mode
270 */
271int sh_unix_setdeamon (const char * dummy);
272int sh_unix_setnodeamon(const char * dummy);
273
274/* Test whether file exists
275 */
276int sh_unix_file_exists(char * path);
277
278/* test whether file exists with proper attributes
279 */
280int sh_unix_device_readable(int fd);
281
282/* local host
283 */
284void sh_unix_localhost(void);
285
286/* check whether /proc exists and is a proc filesystem
287 */
288int sh_unix_test_proc(void);
289
290/* check whether a directory is secure
291 * (no symlink in path, not world-writeable)
292 */
293/* int sh_unix_is_secure_dir (ShErrLevel level, char * tmp); */
294
295/* obtain file info
296 */
297int sh_unix_getinfo (int level, char * filename, file_type * theFile,
298 char * fileHash, int flagrel);
299
300/* read file, return length read
301 */
302int sh_unix_getline (SL_TICKET fd, char * line, int sizeofline);
303
304/* call with goDaemon == 1 to make daemon process
305 */
306int sh_unix_init(int goDaemon);
307
308/* for local time use thetime = 0, returns pointer to buffer
309 */
310char * sh_unix_time (time_t thetime, char * buffer, size_t len);
311
312/* convert to GMT time, returns pointer to buffer
313 */
314char * sh_unix_gmttime (time_t thetime, char * buffer, size_t len);
315
316/* effective user info
317 */
318int sh_unix_getUser (void);
319
320/* get home directory, , returns pointer to out
321 */
322char * sh_unix_getUIDdir (int level, uid_t uid, char * out, size_t len);
323
324
325#ifdef HAVE_GETTIMEOFDAY
326unsigned long sh_unix_notime (void);
327#endif
328
329/* check whether a directory
330 */
331int sh_unix_isdir (char * dirName, int level);
332
333#ifdef SH_STEALTH
334int sh_unix_getline_stealth (SL_TICKET fd, char * str, int len);
335void sh_unix_xor_code (char * str, int len);
336#endif
337
338#if defined(SCREW_IT_UP)
339/* for raise()
340 */
341#include <signal.h>
342#include <errno.h>
343
344void sh_sigtrap_handler (int signum);
345extern volatile int sh_not_traced;
346
347#ifdef HAVE_GETTIMEOFDAY
348#if TIME_WITH_SYS_TIME
349#include <sys/time.h>
350#include <time.h>
351#else
352#if HAVE_SYS_TIME_H
353#include <sys/time.h>
354#else
355#include <time.h>
356#endif
357#endif
358extern struct timeval save_tv;
359#endif
360
361static inline
362int sh_sigtrap_prepare()
363{
364 struct sigaction act_trap;
365 int val_retry;
366 act_trap.sa_handler = &sh_sigtrap_handler; /* signal action */
367 act_trap.sa_flags = 0; /* init sa_flags */
368 sigemptyset ( &act_trap.sa_mask ); /* set an empty mask */
369 do {
370 val_retry = sigaction(SIGTRAP, &act_trap, NULL);
371 } while (val_retry < 0 && errno == EINTR);
372 return 0;
373}
374
375/*@unused@*/ static inline
376int sh_derr(void)
377{
378 sh_not_traced = 0;
379
380#ifdef HAVE_GETTIMEOFDAY
381 gettimeofday(&save_tv, NULL);
382#endif
383
384#if defined(__linux__) && defined(__GNUC__) && defined(__i386__)
385 __asm__ __volatile__ (".byte 0xf1");
386#else
387 raise(SIGTRAP);
388#endif
389
390 if (sh_not_traced == 0)
391 _exit(5);
392 sh_not_traced = 0;
393 return (0);
394}
395
396#else
397
398/*@unused@*/ static inline
399int sh_derr(void)
400{
401 return 0;
402}
403/* #if defined(SCREW_IT_UP) */
404#endif
405
406#endif
407
408
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