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Checking Integrity With *AIDE*
Advanced Intrusion Detection Environment (AIDE) is a utility that creates a database of files on the system, and then uses that database to ensure file integrity and detect system intrusions.
Installing *AIDE*
To install the _aide_ package:
$ sudo dnf install aide
To generate an initial database:
$ sudo aide --init
Start timestamp: 2018-07-11 12:35:47 +0200 (AIDE 0.16)
AIDE initialized database at /var/lib/aide/aide.db.new.gz
Number of entries: 150666
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The attributes of the (uncompressed) database(s):
---------------------------------------------------
/var/lib/aide/aide.db.new.gz
MD5 : 0isjEPsCORFk7laoGGz8tQ==
SHA1 : j0aPLakWChM+TAuxfVIpy9nqBOE=
RMD160 : nYyyx0AGZj4e5rwcz77afasXFrw=
TIGER : IBVo5A2A4En1kM6zDjD/MnlkN4QWeSOw
SHA256 : YveypaI9c5PJNvPSZf8YFfjCMWfGUA8q
vyqLpLJWY0E=
SHA512 : TiUYmHYflS3A+j17qw5mW78Fn2yXLpCF
1LE1/RhiqqtMn1MjkKDrr+3TE+/vWfa4
7253cDhNmC6hoFndkS67Xw==
End timestamp: 2018-07-11 12:37:35 +0200 (run time: 1m 48s)
In the default configuration, the *aide --init* command checks just a set of directories and files defined in the `/etc/aide.conf` file. To include additional directories or files in the AIDE database, and to change their watched parameters, edit `/etc/aide.conf` accordingly.
To start using the database, remove the `.new` substring from the initial database file name:
$ sudo mv /var/lib/aide/aide.db.new.gz /var/lib/aide/aide.db.gz
To change the location of the *AIDE* database, edit the `/etc/aide.conf` file and modify the `DBDIR` value. For additional security, store the database, configuration, and the `/usr/sbin/aide` binary file in a secure location such as a read-only media.
To avoid SELinux denials after the AIDE database location change, update your SELinux policy accordingly. See the link:https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/SELinux_Users_and_Administrators_Guide/[SELinux User's and Administrator's Guide] for more information.
Performing Integrity Checks
To initiate a manual check:
$ sudo aide --check
Start timestamp: 2018-07-11 12:41:20 +0200 (AIDE 0.16)
AIDE found differences between database and filesystem!!
Summary:
Total number of entries: 150667
Added entries: 1
Removed entries: 0
Changed entries: 2