Build and Test AIDE Database
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Description
Run the following command to generate a new database:
By default, the database will be written to the file
/var/lib/aide/aide.db.new.
Storing the database, the configuration file /etc/aide.conf, and the binary
/usr/bin/aide.wrapper
(or hashes of these files), in a secure location (such as on read-only media) provides additional assurance about their integrity.
The newly-generated database can be installed as follows:
$ sudo cp /var/lib/aide/aide.db.new /var/lib/aide/aide.db
To initiate a manual check, run the following command:
$ sudo /usr/bin/aide.wrapper --check
If this check produces any unexpected output, investigate.
Rationale
For AIDE to be effective, an initial database of “known-good” information about files
must be captured and it should be able to be verified against the installed files.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
# Remediation is applicable only in certain platforms
if dpkg-query --show --showformat='${db:Status-Status}
' 'kernel' 2>/dev/null | grep -q installed; then
DEBIAN_FRONTEND=noninteractive apt-get install -y "aide"
AIDE_CONFIG=/etc/aide/aide.conf
DEFAULT_DB_PATH=/var/lib/aide/aide.db
# Fix db path in the config file, if necessary
if ! grep -q '^database=file:' ${AIDE_CONFIG}; then
# replace_or_append gets confused by 'database=file' as a key, so should not be used.
#replace_or_append "${AIDE_CONFIG}" '^database=file' "${DEFAULT_DB_PATH}" '@CCENUM@' '%s:%s'
echo "database=file:${DEFAULT_DB_PATH}" >> ${AIDE_CONFIG}
fi
# Fix db out path in the config file, if necessary
if ! grep -q '^database_out=file:' ${AIDE_CONFIG}; then
echo "database_out=file:${DEFAULT_DB_PATH}.new" >> ${AIDE_CONFIG}
fi
/usr/sbin/aideinit -y -f
else
>&2 echo 'Remediation is not applicable, nothing was done'
fi
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Gather the package facts
package_facts:
manager: auto
tags:
- CJIS-5.10.1.3
- DISA-STIG-UBTU-20-010450
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-11.5
- PCI-DSSv4-11.5.2
- aide_build_database
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Build and Test AIDE Database - Ensure AIDE Is Installed
ansible.builtin.apt:
name: aide
state: present
when: '"kernel" in ansible_facts.packages'
tags:
- CJIS-5.10.1.3
- DISA-STIG-UBTU-20-010450
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-11.5
- PCI-DSSv4-11.5.2
- aide_build_database
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Build and Test AIDE Database - Check if DB Path in /etc/aide/aide.conf Is
Already Set
ansible.builtin.lineinfile:
path: /etc/aide/aide.conf
regexp: ^#?(\s*)(database=)(.*)$
state: absent
check_mode: true
changed_when: false
register: database_replace
when: '"kernel" in ansible_facts.packages'
tags:
- CJIS-5.10.1.3
- DISA-STIG-UBTU-20-010450
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-11.5
- PCI-DSSv4-11.5.2
- aide_build_database
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Build and Test AIDE Database - Check if DB Out Path in /etc/aide/aide.conf
Is Already Set
ansible.builtin.lineinfile:
path: /etc/aide/aide.conf
regexp: ^#?(\s*)(database_out=)(.*)$
state: absent
check_mode: true
changed_when: false
register: database_out_replace
when: '"kernel" in ansible_facts.packages'
tags:
- CJIS-5.10.1.3
- DISA-STIG-UBTU-20-010450
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-11.5
- PCI-DSSv4-11.5.2
- aide_build_database
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Build and Test AIDE Database - Fix DB Path in Config File if Necessary
ansible.builtin.lineinfile:
path: /etc/aide/aide.conf
regexp: ^#?(\s*)(database)(\s*)=(\s*)(.*)$
line: \2\3=\4file:/var/lib/aide/aide.db
backrefs: true
when:
- '"kernel" in ansible_facts.packages'
- database_replace.found > 0
tags:
- CJIS-5.10.1.3
- DISA-STIG-UBTU-20-010450
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-11.5
- PCI-DSSv4-11.5.2
- aide_build_database
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Build and Test AIDE Database - Fix DB Out Path in Config File if Necessary
ansible.builtin.lineinfile:
path: /etc/aide/aide.conf
regexp: ^#?(\s*)(database_out)(\s*)=(\s*)(.*)$
line: \2\3=\4file:/var/lib/aide/aide.db.new
backrefs: true
when:
- '"kernel" in ansible_facts.packages'
- database_out_replace.found > 0
tags:
- CJIS-5.10.1.3
- DISA-STIG-UBTU-20-010450
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-11.5
- PCI-DSSv4-11.5.2
- aide_build_database
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Build and Test AIDE Database - Ensure the Default DB Path is Added
ansible.builtin.lineinfile:
path: /etc/aide/aide.conf
line: database=file:/var/lib/aide/aide.db
create: true
when:
- '"kernel" in ansible_facts.packages'
- database_replace.found == 0
tags:
- CJIS-5.10.1.3
- DISA-STIG-UBTU-20-010450
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-11.5
- PCI-DSSv4-11.5.2
- aide_build_database
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Build and Test AIDE Database - Ensure the Default Out Path is Added
ansible.builtin.lineinfile:
path: /etc/aide/aide.conf
line: database_out=file:/var/lib/aide/aide.db.new
create: true
when:
- '"kernel" in ansible_facts.packages'
- database_out_replace.found == 0
tags:
- CJIS-5.10.1.3
- DISA-STIG-UBTU-20-010450
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-11.5
- PCI-DSSv4-11.5.2
- aide_build_database
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Build and Test AIDE Database - Build and Test AIDE Database
ansible.builtin.command: /usr/sbin/aideinit -y -f
when: '"kernel" in ansible_facts.packages'
tags:
- CJIS-5.10.1.3
- DISA-STIG-UBTU-20-010450
- NIST-800-53-CM-6(a)
- PCI-DSS-Req-11.5
- PCI-DSSv4-11.5.2
- aide_build_database
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
