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Showing SKILL.md
| name | cis-ubuntu2004-v300-6-2-1-3 |
| description | Ensure journald log file rotation is configured |
| category | cis-logging |
| version | 3.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-20.04","journald"] |
| cis_id | 6.2.1.3 |
| cis_benchmark | CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Journald includes the capability of rotating log files regularly to avoid filling up the system with logs or making the logs unmanageably large. The file /etc/systemd/journald.conf is the configuration file used to specify how logs generated by Journald should be rotated.
By keeping the log files smaller and more manageable, a system administrator can easily archive these files to another system and spend less time looking through inordinately large log files.
Review the systemd-journald configuration. Verify logs are rotated according to site policy. The specific parameters for log rotation are:
Run the following script and review the output to ensure logs are rotated according to site policy:
#!/usr/bin/env bash
{
a_output=() a_output2=() l_analyze_cmd="$(readlink -f /bin/systemd-analyze)"
l_systemd_config_file="systemd/journald.conf"
a_parameters=("SystemMaxUse=^.+$" "SystemKeepFree=^.+$" "RuntimeMaxUse=^.+$" "RuntimeKeepFree=^.+$"
"MaxFileSec=^.+$")
# ... (full audit script from benchmark)
}
Review the output to verify log rotation parameters are configured according to site policy.
Edit /etc/systemd/journald.conf or a file ending in .conf the /etc/systemd/journald.conf.d/ directory. Set the following parameters in the [Journal] section to ensure logs are rotated according to site policy. The settings should be carefully understood as there are specific edge cases and prioritization of parameters.
Example Configuration:
[Journal]
SystemMaxUse=1G
SystemKeepFree=500M
RuntimeMaxUse=200M
=M
=month
Example script to create systemd drop-in configuration file:
{
a_settings=("SystemMaxUse=1G" "SystemKeepFree=500M" "RuntimeMaxUse=200M" "RuntimeKeepFree=50M"
"MaxFileSec=1month")
[ ! -d /etc/systemd/journald.conf.d/ ] && mkdir /etc/systemd/journald.conf.d/
if grep -Psq -- '^\h*\[Journal\]' /etc/systemd/journald.conf.d/60-journald.conf; then
printf '%s\n' "" "${a_settings[@]}" >> /etc/systemd/journald.conf.d/60-journald.conf
else
printf '%s\n' "" "[Journal]" "${a_settings[@]}" >> /etc/systemd/journald.conf.d/60-journald.conf
fi
}
Note:
Run to following command to update the parameters in the service:
# systemctl reload-or-restart systemd-journald
Not specifically configured by default.
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 8.2 Collect Audit Logs | |||
| v7 | 6.2 Activate audit logging | |||
| v7 | 6.3 Enable Detailed Logging |
| Techniques / Sub-techniques | Tactics | Mitigations |
|---|---|---|
| T1070, T1070.002 | TA0040 | M1022 |