syscheck
Configuration options for file integrity monitoring.
Options
directories
Use this option to add or remove directories to be monitored. The directories must be comma separated.
All files and subdirectories within the noted directories will also be monitored.
Drive letters without directories are not valid. At a minimum the '.' should be included (D:\.
).
This is to be set on the system to be monitored (or in the agent.conf
, if appropriate).
Default value |
/etc,/usr/bin,/usr/sbin,/bin,/sbin |
Allowed values |
Any directory |
Atributes:
realtime |
This will enable real-time/continuous monitoring on Linux (using the inotify system calls) and Windows systems. Real time only works with directories, not individual files. |
|
Allowed values |
yes, no |
|
report_changes |
Report file changes. This is limited to text files at this time. |
|
Allowed values |
yes, no |
|
check_all |
All the following check_* options are used together. |
|
Allowed values |
yes, no |
|
check_sum |
Check the MD5 and SHA-1 hashes of the files. Same as using both |
|
Allowed values |
yes, no |
|
check_sha1sum |
Check only the SHA-1 hash of the files. |
|
Allowed values |
yes, no |
|
check_md5sum |
Check only the MD5 hash of the files. |
|
Allowed values |
yes, no |
|
check_size |
Check the size of the files. |
|
Allowed values |
yes, no |
|
check_owner |
Check the owner of the files. On Windows, uid will always be 0. |
|
Allowed values |
yes, no |
|
check_group |
Check the group owner of the files/directories. Available for UNIX. On Windows, gid will always be 0 and the group name will be blank. |
|
Allowed values |
yes, no |
|
check_perm |
Check the UNIX permission of the files/directories. On Windows, this will only check the POSIX permissions. |
|
Allowed values |
yes, no |
|
check_mtime |
Check the modification time of a file. New in version 2.0. |
|
Allowed values |
yes, no |
|
check_inode |
Check the file inode. Available for UNIX. On Windows, inode will always be 0. New in version 2.0. |
|
Allowed values |
yes, no |
|
restrict |
Limit checks to files containing the entered string in the file name. Any directory or file name (but not a path) is allowed |
|
Allowed value |
string |
ignore
List of files or directories to be ignored (one entry per line). Multiple lines may be entered to include multiple files or directories. These files and directories are still checked, but the results are ignored.
Default value |
/etc/mtab |
Allowed values |
Any directory or file name |
Attributes:
type |
This is a simple regex pattern to filter out files so alerts are not generated |
|
Allowed values |
sregex |
nodiff
List of files to not compute the diff (one entry per line). It could be used for sensitive files like a private key, credentials stored in a file or database configuration, avoiding data leaking by sending the file content changes through alerts.
Default value |
/etc/ssl/private.key |
Allowed values |
Any file name |
Attributes:
type |
This is a simple regex pattern to filter out files so alerts are not generated |
|
Allowed values |
sregex |
frequency
Frequency that the syscheck will be run (in seconds).
Default value |
21600 |
Allowed values |
A positive number, time in seconds |
scan_time
Time to run the scans. Times may be represented as 21pm or 8:30.
Default value |
n/a |
Allowed values |
Time of day |
Note
This may delay the initialization of real-time scans.
scan_day
Day of the week to run the scans(one entry per line). Multiple lines may be entered to include multiple registry entries.
Default value |
n/a |
Allowed values |
Day of the week |
auto_ignore
Specifies whether or not syscheck will ignore files that change too many times (after the third change).
Default value |
yes |
Allowed values |
yes, no |
Note
It is valid on: server and local.
alert_new_files
Specifies if syscheck should alert when new files are created.
Default value |
no |
Allowed values |
yes, no |
Note
It is valid on: server and local.
scan_on_start
Specifies if syscheck scans immediately when started.
Default value |
yes |
Allowed values |
yes, no |
windows_registry
Use this option to monitor specified Windows registry entries (one entry per line). Multiple lines may be entered to include multiple registry entries.
Default value |
HKEY_LOCAL_MACHINE\Software |
Allowed values |
Any registry entry |
Atributes:
arch |
Select the Registry view depending on the architecture. |
|
Default value |
32bit |
|
Allowed values |
32bit, 64bit, both |
Note
New entries will not trigger alerts, only changes to existing entries.
registry_ignore
List of registry entries to be ignored. (one entry per line). Multiple lines may be entered to include multiple registry entries.
Default value |
..CryptographyRNG |
Allowed values |
Any registry entry |
prefilter_cmd
Run to prevent prelinking from creating false positives.
Default value |
n/a |
Allowed values |
Command to prevent prelinking |
Example:
<prefilter_cmd>/usr/sbin/prelink -y</prefilter_cmd>
Note
This option may negatively impact performance as the configured command will be run for each file checked.
skip_nfs
Specifies if syscheck should scan network mounted filesystems (Works on Linux and FreeBSD). Currently, skip_nfs will exclude checking files on CIFS or NFS mounts.
Default value |
no |
Allowed values |
yes, no |
Default Unix configuration
<!-- File integrity monitoring -->
<syscheck>
<disabled>no</disabled>
<!-- Frequency that syscheck is executed default every 12 hours -->
<frequency>43200</frequency>
<scan_on_start>yes</scan_on_start>
<!-- Generate alert when new file detected -->
<alert_new_files>yes</alert_new_files>
<!-- Don't ignore files that change more than 3 times -->
<auto_ignore>no</auto_ignore>
<!-- Directories to check (perform all possible verifications) -->
<directories check_all="yes">/etc,/usr/bin,/usr/sbin</directories>
<directories check_all="yes">/bin,/sbin,/boot</directories>
<!-- Files/directories to ignore -->
<ignore>/etc/mtab</ignore>
<ignore>/etc/hosts.deny</ignore>
<ignore>/etc/mail/statistics</ignore>
<ignore>/etc/random-seed</ignore>
<ignore>/etc/random.seed</ignore>
<ignore>/etc/adjtime</ignore>
<ignore>/etc/httpd/logs</ignore>
<ignore>/etc/utmpx</ignore>
<ignore>/etc/wtmpx</ignore>
<ignore>/etc/cups/certs</ignore>
<ignore>/etc/dumpdates</ignore>
<ignore>/etc/svc/volatile</ignore>
<!-- Check the file, but never compute the diff -->
<nodiff>/etc/ssl/private.key</nodiff>
<skip_nfs>yes</skip_nfs>
</syscheck>