| 1 | /* SAMHAIN file system integrity testing */
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| 2 | /* Copyright (C) 1999 Rainer Wichmann */
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| 3 | /* */
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| 4 | /* This program is free software; you can redistribute it */
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| 5 | /* and/or modify */
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| 6 | /* it under the terms of the GNU General Public License as */
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| 7 | /* published by */
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| 8 | /* the Free Software Foundation; either version 2 of the License, or */
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| 9 | /* (at your option) any later version. */
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| 10 | /* */
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| 11 | /* This program is distributed in the hope that it will be useful, */
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| 12 | /* but WITHOUT ANY WARRANTY; without even the implied warranty of */
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| 13 | /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
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| 14 | /* GNU General Public License for more details. */
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| 15 | /* */
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| 16 | /* You should have received a copy of the GNU General Public License */
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| 17 | /* along with this program; if not, write to the Free Software */
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| 18 | /* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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| 19 |
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| 20 |
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| 21 |
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| 22 | #ifndef SH_UNIX_H
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| 23 | #define SH_UNIX_H
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| 24 |
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| 25 | #include <limits.h>
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| 26 | #include <unistd.h>
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| 27 | #include "samhain.h"
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| 28 | #include "sh_error.h"
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| 29 |
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| 30 |
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| 31 | typedef enum {
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| 32 | SH_ISLOG,
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| 33 | SH_ISFILE,
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| 34 | SH_ISDIR,
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| 35 | SH_ISDATA
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| 36 | } ShOpenType;
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| 37 |
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| 38 | typedef enum {
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| 39 | SH_DATA_RAW,
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| 40 | SH_DATA_LINE
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| 41 | } ShDataType;
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| 42 |
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| 43 | typedef enum {
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| 44 | SH_FILE_REGULAR,
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| 45 | SH_FILE_SYMLINK,
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| 46 | SH_FILE_DIRECTORY,
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| 47 | SH_FILE_CDEV,
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| 48 | SH_FILE_BDEV,
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| 49 | SH_FILE_FIFO,
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| 50 | SH_FILE_SOCKET,
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| 51 | SH_FILE_UNKNOWN
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| 52 | } ShFileType;
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| 53 |
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| 54 | /* -- Attributes to check. --
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| 55 | */
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| 56 |
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| 57 | /* checksum */
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| 58 | #define MODI_CHK (1 << 0)
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| 59 | /* link */
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| 60 | #define MODI_LNK (1 << 1)
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| 61 | /* inode */
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| 62 | #define MODI_INO (1 << 2)
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| 63 | /* user */
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| 64 | #define MODI_USR (1 << 3)
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| 65 | /* group */
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| 66 | #define MODI_GRP (1 << 4)
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| 67 | /* mtime */
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| 68 | #define MODI_MTM (1 << 5)
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| 69 | /* ctime */
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| 70 | #define MODI_CTM (1 << 6)
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| 71 | /* atime */
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| 72 | #define MODI_ATM (1 << 7)
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| 73 | /* size */
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| 74 | #define MODI_SIZ (1 << 8)
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| 75 | /* file mode */
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| 76 | #define MODI_MOD (1 << 9)
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| 77 | /* hardlinks */
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| 78 | #define MODI_HLN (1 << 10)
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| 79 | /* device num */
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| 80 | #define MODI_RDEV (1 << 11)
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| 81 | /* size may grow */
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| 82 | #define MODI_SGROW (1 << 12)
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| 83 | /* use prelink */
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| 84 | #define MODI_PREL (1 << 13)
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| 85 |
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| 86 | #define MASK_ALLIGNORE_ 0
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| 87 | extern unsigned long mask_ALLIGNORE;
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| 88 | #define MASK_ATTRIBUTES_ (MODI_MOD|MODI_USR|MODI_GRP|MODI_RDEV)
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| 89 | extern unsigned long mask_ATTRIBUTES;
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| 90 | #define MASK_LOGFILES_ (MASK_ATTRIBUTES_|MODI_HLN|MODI_LNK|MODI_INO)
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| 91 | extern unsigned long mask_LOGFILES;
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| 92 | #define MASK_LOGGROW_ (MASK_LOGFILES_|MODI_SIZ|MODI_SGROW|MODI_CHK)
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| 93 | extern unsigned long mask_LOGGROW;
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| 94 | #define MASK_READONLY_ (MASK_LOGFILES_|MODI_CHK|MODI_SIZ|MODI_MTM|MODI_CTM)
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| 95 | extern unsigned long mask_READONLY;
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| 96 | #define MASK_NOIGNORE_ (MASK_LOGFILES_|MODI_CHK|MODI_SIZ|MODI_ATM|MODI_MTM)
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| 97 | extern unsigned long mask_NOIGNORE;
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| 98 | #define MASK_USER_ (MASK_READONLY_|MODI_ATM)
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| 99 | extern unsigned long mask_USER0;
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| 100 | extern unsigned long mask_USER1;
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| 101 | /* like READONLY, but without MTM,CTM,SIZ,INO, abd with PREL)
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| 102 | */
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| 103 | #define MASK_PRELINK_ (MASK_ATTRIBUTES_|MODI_HLN|MODI_LNK|MODI_CHK|MODI_PREL)
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| 104 | extern unsigned long mask_PRELINK;
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| 105 |
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| 106 | typedef struct file_struct {
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| 107 | unsigned long check_mask;
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| 108 | int reported;
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| 109 | char fullpath[PATH_MAX];
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| 110 | ShFileType type;
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| 111 | dev_t dev;
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| 112 | ino_t ino;
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| 113 | mode_t mode;
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| 114 | nlink_t hardlinks;
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| 115 | #if defined(__linux__) || defined(HAVE_STAT_FLAGS)
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| 116 | unsigned long attributes;
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| 117 | char c_attributes[16];
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| 118 | #endif
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| 119 | char c_mode[11];
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| 120 | uid_t owner;
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| 121 | char c_owner[USER_MAX+2];
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| 122 | gid_t group;
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| 123 | char c_group[GROUP_MAX+2];
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| 124 | dev_t rdev;
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| 125 | off_t size;
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| 126 | unsigned long blksize;
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| 127 | unsigned long blocks;
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| 128 | time_t atime;
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| 129 | time_t mtime;
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| 130 | time_t ctime;
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| 131 |
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| 132 | char linkpath[PATH_MAX];
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| 133 | mode_t linkmode;
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| 134 | char link_c_mode[11];
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| 135 | int linkisok;
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| 136 | } file_type;
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| 137 |
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| 138 | /* mlock utilities
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| 139 | */
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| 140 | int sh_unix_mlock(char * file, int line, void * addr, size_t len);
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| 141 | int sh_unix_munlock(void * addr, size_t len);
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| 142 | int sh_unix_count_mlock();
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| 143 | /* public for unit tests */
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| 144 | int sh_unix_pagesize();
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| 145 | unsigned long sh_unix_lookup_page(void * in_addr, size_t len, int * num_pages);
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| 146 |
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| 147 | /* chroot directory
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| 148 | */
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| 149 | int sh_unix_set_chroot(const char * str);
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| 150 |
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| 151 | /* whether to use localtime for file timesatams in logs
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| 152 | */
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| 153 | int sh_unix_uselocaltime (const char * c);
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| 154 |
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| 155 | /* set I/O limit
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| 156 | */
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| 157 | int sh_unix_set_io_limit (const char * c);
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| 158 | void sh_unix_io_pause ();
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| 159 |
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| 160 | /* get file type
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| 161 | */
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| 162 | int sh_unix_get_ftype(char * fullpath);
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| 163 |
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| 164 | /* reset masks for policies
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| 165 | */
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| 166 | int sh_unix_maskreset();
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| 167 |
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| 168 | /* return true if database is remote
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| 169 | */
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| 170 | int file_is_remote ();
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| 171 |
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| 172 | /* return the path to the configuration/database file
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| 173 | */
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| 174 | char * file_path(char what, char flag);
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| 175 |
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| 176 | /* return current time as unsigned long
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| 177 | */
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| 178 | unsigned long sh_unix_longtime (void);
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| 179 |
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| 180 | /* close all files >= fd, except possibly one
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| 181 | */
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| 182 | void sh_unix_closeall (int fd, int except);
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| 183 |
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| 184 |
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| 185 | /* write lock for filename
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| 186 | */
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| 187 | int sh_unix_write_lock_file(char * filename);
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| 188 |
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| 189 | /* rm lock(s) for log file(s)
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| 190 | */
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| 191 | int sh_unix_rm_lock_file(char * filename);
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| 192 |
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| 193 | /* write the PID file
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| 194 | */
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| 195 | int sh_unix_write_pid_file();
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| 196 |
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| 197 | /* rm the PID file
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| 198 | */
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| 199 | int sh_unix_rm_pid_file();
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| 200 |
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| 201 |
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| 202 | /* checksum of own binary
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| 203 | */
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| 204 | int sh_unix_self_hash (const char * c);
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| 205 |
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| 206 | /* return BAD on failure
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| 207 | */
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| 208 | int sh_unix_self_check (void);
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| 209 |
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| 210 | /* add a trusted user to the list
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| 211 | */
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| 212 | int tf_add_trusted_user(const char *);
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| 213 |
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| 214 | /* check a file
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| 215 | */
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| 216 | int tf_trust_check (char * file, int mode);
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| 217 |
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| 218 | /* initialize group vector
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| 219 | */
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| 220 | #ifdef HOST_IS_OSF
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| 221 | int sh_unix_initgroups ( char * in_user, gid_t in_gid);
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| 222 | #else
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| 223 | int sh_unix_initgroups (const char * in_user, gid_t in_gid);
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| 224 | #endif
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| 225 | int sh_unix_initgroups2 (uid_t in_pid, gid_t in_gid);
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| 226 |
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| 227 | /* set the timeserver address
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| 228 | */
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| 229 | int sh_unix_settimeserver (const char * address);
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| 230 | void reset_count_dev_time(void);
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| 231 |
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| 232 | /* lock the key
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| 233 | */
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| 234 | void sh_unix_memlock(void);
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| 235 |
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| 236 | /* deamon mode
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| 237 | */
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| 238 | int sh_unix_setdeamon (const char * dummy);
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| 239 | int sh_unix_setnodeamon(const char * dummy);
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| 240 |
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| 241 | /* Test whether file exists
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| 242 | */
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| 243 | int sh_unix_file_stat(char * path);
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| 244 |
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| 245 | /* test whether file exists with proper attributes
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| 246 | */
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| 247 | int sh_unix_file_exists(int fd);
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| 248 |
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| 249 | /* local host
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| 250 | */
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| 251 | void sh_unix_localhost(void);
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| 252 |
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| 253 | /* check whether /proc exists and is a proc filesystem
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| 254 | */
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| 255 | int sh_unix_test_proc(void);
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| 256 |
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| 257 | /* check whether a directory is secure
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| 258 | * (no symlink in path, not world-writeable)
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| 259 | */
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| 260 | /* int sh_unix_is_secure_dir (ShErrLevel level, char * tmp); */
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| 261 |
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| 262 | /* obtain file info
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| 263 | */
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| 264 | int sh_unix_getinfo (int level, char * filename, file_type * theFile,
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| 265 | char * fileHash, int flagrel);
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| 266 |
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| 267 | /* read file, return length read
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| 268 | */
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| 269 | int sh_unix_getline (SL_TICKET fd, char * line, int sizeofline);
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| 270 |
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| 271 | /* call with goDaemon == 1 to make daemon process
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| 272 | */
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| 273 | int sh_unix_init(int goDaemon);
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| 274 |
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| 275 | /* for local time use thetime = 0
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| 276 | */
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| 277 | /*@owned@*/ char * sh_unix_time (time_t thetime);
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| 278 |
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| 279 | /* convert to GMT time
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| 280 | */
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| 281 | char * sh_unix_gmttime (time_t thetime);
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| 282 |
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| 283 | /* effective user info
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| 284 | */
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| 285 | int sh_unix_getUser (void);
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| 286 |
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| 287 | /* get home directory
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| 288 | */
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| 289 | char * sh_unix_getUIDdir (int level, uid_t uid);
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| 290 |
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| 291 |
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| 292 | #ifdef HAVE_GETTIMEOFDAY
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| 293 | unsigned long sh_unix_notime (void);
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| 294 | #endif
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| 295 |
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| 296 | /* check whether a directory
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| 297 | */
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| 298 | int sh_unix_isdir (char * dirName, int level);
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| 299 |
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| 300 | #ifdef SH_STEALTH
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| 301 | int sh_unix_getline_stealth (SL_TICKET fd, char * str, int len);
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| 302 | void sh_unix_xor_code (char * str, int len);
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| 303 | #endif
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| 304 |
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| 305 | #if defined(SCREW_IT_UP)
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| 306 | /* for raise()
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| 307 | */
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| 308 | #include <signal.h>
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| 309 | #include <errno.h>
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| 310 |
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| 311 | void sh_sigtrap_handler (int signum);
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| 312 | extern volatile int sh_not_traced;
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| 313 |
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| 314 | #ifdef HAVE_GETTIMEOFDAY
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| 315 | #if TIME_WITH_SYS_TIME
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| 316 | #include <sys/time.h>
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| 317 | #include <time.h>
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| 318 | #else
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| 319 | #if HAVE_SYS_TIME_H
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| 320 | #include <sys/time.h>
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| 321 | #else
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| 322 | #include <time.h>
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| 323 | #endif
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| 324 | #endif
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| 325 | extern struct timeval save_tv;
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| 326 | #endif
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| 327 |
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| 328 | static inline
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| 329 | int sh_sigtrap_prepare()
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| 330 | {
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| 331 | struct sigaction act_trap;
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| 332 | int val_retry;
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| 333 | act_trap.sa_handler = &sh_sigtrap_handler; /* signal action */
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| 334 | act_trap.sa_flags = 0; /* init sa_flags */
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| 335 | sigemptyset ( &act_trap.sa_mask ); /* set an empty mask */
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| 336 | do {
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| 337 | val_retry = sigaction(SIGTRAP, &act_trap, NULL);
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| 338 | } while (val_retry < 0 && errno == EINTR);
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| 339 | return 0;
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| 340 | }
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| 341 |
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| 342 | /*@unused@*/ static inline
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| 343 | int sh_derr(void)
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| 344 | {
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| 345 | sh_not_traced = 0;
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| 346 |
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| 347 | #ifdef HAVE_GETTIMEOFDAY
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| 348 | gettimeofday(&save_tv, NULL);
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| 349 | #endif
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| 350 |
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| 351 | #if defined(__linux__) && defined(__GNUC__) && defined(__i386__)
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| 352 | __asm__ __volatile__ ("int $0x03");
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| 353 | #else
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| 354 | raise(SIGTRAP);
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| 355 | #endif
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| 356 |
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| 357 | if (sh_not_traced == 0)
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| 358 | _exit(5);
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| 359 | sh_not_traced = 0;
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| 360 | return (0);
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| 361 | }
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| 362 |
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| 363 | #else
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| 364 |
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| 365 | /*@unused@*/ static inline
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| 366 | int sh_derr(void)
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| 367 | {
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| 368 | return 0;
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| 369 | }
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| 370 | /* #if defined(SCREW_IT_UP) */
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| 371 | #endif
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| 372 |
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| 373 | #endif
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| 374 |
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| 375 |
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