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109 lines
4.2 KiB
Text
109 lines
4.2 KiB
Text
[id='sec-Using-AIDE']
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= Checking Integrity With *AIDE*
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:experimental:
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include::{partialsdir}/unreviewed-message.adoc[]
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include::{partialsdir}/attributes.adoc[]
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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.
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== Installing *AIDE*
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. To install the _aide_ package:
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+
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[source,shell,subs="attributes"]
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----
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$ sudo dnf install aide
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----
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. To generate an initial database:
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[source,shell,subs="attributes"]
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----
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$ sudo aide --init
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Start timestamp: 2018-07-11 12:35:47 +0200 (AIDE 0.16)
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AIDE initialized database at /var/lib/aide/aide.db.new.gz
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Number of entries: 150666
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---------------------------------------------------
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The attributes of the (uncompressed) database(s):
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---------------------------------------------------
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/var/lib/aide/aide.db.new.gz
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MD5 : 0isjEPsCORFk7laoGGz8tQ==
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SHA1 : j0aPLakWChM+TAuxfVIpy9nqBOE=
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RMD160 : nYyyx0AGZj4e5rwcz77afasXFrw=
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TIGER : IBVo5A2A4En1kM6zDjD/MnlkN4QWeSOw
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SHA256 : YveypaI9c5PJNvPSZf8YFfjCMWfGUA8q
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vyqLpLJWY0E=
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SHA512 : TiUYmHYflS3A+j17qw5mW78Fn2yXLpCF
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1LE1/RhiqqtMn1MjkKDrr+3TE+/vWfa4
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7253cDhNmC6hoFndkS67Xw==
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End timestamp: 2018-07-11 12:37:35 +0200 (run time: 1m 48s)
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----
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NOTE: 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.
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. To start using the database, remove the `.new` substring from the initial database file name:
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[source,shell,subs="attributes"]
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----
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$ sudo mv /var/lib/aide/aide.db.new.gz /var/lib/aide/aide.db.gz
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----
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. 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.
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IMPORTANT: 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.
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== Performing Integrity Checks
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To initiate a manual check:
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[source,shell,subs="attributes"]
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----
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$ sudo aide --check
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Start timestamp: 2018-07-11 12:41:20 +0200 (AIDE 0.16)
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AIDE found differences between database and filesystem!!
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Summary:
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Total number of entries: 150667
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Added entries: 1
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Removed entries: 0
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Changed entries: 2
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---------------------------------------------------
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Added entries:
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---------------------------------------------------
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f++++++++++++++++: /etc/cups/subscriptions.conf.O
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...
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[output truncated]
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----
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At a minimum, *AIDE* should be configured to run a weekly scan. At most, *AIDE* should be run daily. For example, to schedule a daily execution of AIDE at _04:05_ a.m. using the *cron* command, see the xref:{MAJOROSVER}@fedora:system-administrators-guide:monitoring-and-automation/Automating_System_Tasks.adoc[Automating System Tasks] chapter in the System Administrator's Guide.
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Add the following line to the `/etc/crontab` file:
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[source,shell,subs="attributes"]
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----
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05 4 * * * root /usr/sbin/aide --check
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----
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== Updating an *AIDE* Database
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After verifying the changes of your system such as, package updates or configuration files adjustments, update your baseline *AIDE* database:
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[source,shell,subs="attributes"]
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----
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$ sudo aide --update
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----
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The *aide --update* command creates the `/var/lib/aide/aide.db.new.gz` database file. To start using it for integrity checks, remove the `.new` substring from the file name.
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== Additional Resources
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For additional information on *AIDE*, see the following documentation:
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- link:https://static.open-scap.org/ssg-guides/ssg-sl7-guide-ospp-rhel7-server.html#xccdf_org.ssgproject.content_group_aide[Guide to the Secure Configuration of Red Hat Enterprise Linux 7 (OpenSCAP Security Guide): Verify Integrity with AIDE]
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- link:http://aide.sourceforge.net/stable/manual.html[The AIDE manual]
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