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OSSO build of the aide Advanced Intrusion Detection Environment

This enables builds for aide 0.18.x for older Ubuntu, like Focal and Jammy.

For Jessie it also builds, but with --without-posix-acl --without-xattr --without-e2fsattrs --without-audit. See the Jessie heading below.

Docker build

Just do:

./Dockerfile.build

And it will create the build files in Dockerfile.out/.

For example:

$ dpkg-deb -c jammy/aide_0.18.6-2osso0+ubu22.04/aide_0.18.6-2osso0+ubu22.04_amd64.deb
drwxr-xr-x root/root         0 2023-03-01 11:40 ./
drwxr-xr-x root/root         0 2023-03-01 11:40 ./usr/
drwxr-xr-x root/root         0 2023-03-01 11:40 ./usr/bin/
-rwxr-xr-x root/root    220456 2023-03-01 11:40 ./usr/bin/aide
...

Jessie

On Jessie you cannot use aideinit because it tries an older capsh that has no --addamb=cap_dac_read_search,cap_audit_write. We won't need an _aide user either.

Other patches:

--- a/aide/aide.conf
+++ b/aide/aide.conf
@@ -26,7 +26,7 @@ gzip_dbout=yes
 #report_level=changed_attributes

 # Ignore e2fs attributes that cannot be set manually
-report_ignore_e2fsattrs=VNIE
+#report_ignore_e2fsattrs=VNIE

 # Set to yes to print the checksums in the report in hex format
 #report_base16 = false
--- a/aide/aide.conf.d/01_aide_custom
+++ b/aide/aide.conf.d/01_aide_custom
@@ -20,12 +20,12 @@ database_attrs = E
 #report_level=changed_attributes

 # Audit tools
-/sbin/auditctl p+i+n+u+g+s+b+acl+xattrs+sha512
-/sbin/aureport p+i+n+u+g+s+b+acl+xattrs+sha512
-/sbin/ausearch p+i+n+u+g+s+b+acl+xattrs+sha512
-/sbin/autrace p+i+n+u+g+s+b+acl+xattrs+sha512
-/sbin/auditd p+i+n+u+g+s+b+acl+xattrs+sha512
-/sbin/augenrules p+i+n+u+g+s+b+acl+xattrs+sha512
+/sbin/auditctl p+i+n+u+g+s+b+sha512
+/sbin/aureport p+i+n+u+g+s+b+sha512
+/sbin/ausearch p+i+n+u+g+s+b+sha512
+/sbin/autrace p+i+n+u+g+s+b+sha512
+/sbin/auditd p+i+n+u+g+s+b+sha512
+/sbin/augenrules p+i+n+u+g+s+b+sha512

 # Include the following dirs
 /boot R

Run aide as root:

# aide --config=/etc/aide/aide.conf --init
Start timestamp: 2024-03-01 14:46:37 +0100 (AIDE 0.18.6)
AIDE successfully initialized database.
New AIDE database written to /var/lib/aide/aide.db.new

Number of entries:      14404

End timestamp: 2024-03-01 14:46:40 +0100 (run time: 0m 3s)
# aide --config=/etc/aide/aide.conf --check
Start timestamp: 2024-03-01 14:47:59 +0100 (AIDE 0.18.6)
AIDE found differences between database and filesystem!!

Summary:
  Total number of entries:      14404
  Added entries:                0
  Removed entries:              0
  Changed entries:              1
...

Additionally, you will need to setup a cronjob or systemd.timer and appropriate service file as well. (They aren't installed because of the missing dh_installsystemd.)

Possible aidecheck.service file:

[Unit]
Description=AIDE Check

[Service]
Type=simple
# We bump the timeout because AIDE can take quite some time to finish
TimeoutStartSec=3600

# AIDE doesn't exit with 0 if it found differences, resulting in a failed
# systemd unit which we don't really want.
ExecStart=/bin/sh -c '/usr/bin/aide --config /etc/aide/aide.conf --update || /bin/true'

# AIDE writes a /var/lib/aide/aide.db.new with the results of the scan. The
# checks however are always done against /var/lib/aide/aide.db which never gets
# updated so we move this manually
ExecStop=/bin/sh -c 'if test -s /var/lib/aide/aide.db.new; then mv /var/lib/aide/aide.db.new /var/lib/aide/aide.db && echo "Moved /var/lib/aide/aide.db.new to /var/lib/aide/aide.db"; else echo "No /var/lib/aide/aide.db.new found, not moving"; fi'

SyslogIdentifier=aide

Possible aidecheck.timer file:

[Unit]
Description=Aide check every day at 5AM

[Timer]
OnCalendar=*-*-* 05:00:00
Unit=aidecheck.service

[Install]
WantedBy=multi-user.target