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More improvements to the Mondoo Linux Security policy #451

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merged 4 commits into from
Nov 18, 2024
Merged

More improvements to the Mondoo Linux Security policy #451

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a4d88eb
Specify the unit
tas50 Nov 18, 2024
faa4ccd
Have users reload auditd after changing the config
tas50 Nov 18, 2024
3d1c204
Fix the recommended rsyslog syntax
tas50 Nov 18, 2024
09c2b3e
Fix the loopback check for postfix
tas50 Nov 18, 2024
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24 changes: 21 additions & 3 deletions core/mondoo-linux-security.mql.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -694,7 +694,7 @@ queries:
if( package("exim4").installed && service('exim4').running ) {
parse.ini("/etc/exim4/update-exim4.conf.conf").params["dc_local_interfaces"] == "'127.0.0.1 ; ::1'"
}
ports.listening.where(address != "127.0.0.1" && address != "::1").none(port == 25)
ports.listening.where(address != "127.0.0.1" && address != "[::1]").none(port == 25)
docs:
desc: Mail Transfer Agents (MTA), such as Exim and Postfix, listen for incoming mail and transfer the messages to the appropriate user or mail server. If the system is not intended to be a mail server, it is recommended that the MTA be configured to only process local mail.
remediation: |-
Expand Down Expand Up @@ -1251,6 +1251,12 @@ queries:
```
max_log_file = <MB>
```

Restart the service to load the new configuration values:

```
service auditd reload
```
- uid: mondoo-linux-security-audit-logs-are-not-automatically-deleted
title: Ensure audit logs are not automatically deleted
impact: 40
Expand All @@ -1268,6 +1274,12 @@ queries:
```
max_log_file_action = keep_logs
```

Restart the service to load the new configuration values:

```
service auditd reload
```
- uid: mondoo-linux-security-system-is-disabled-when-audit-logs-are-full
title: Ensure system is disabled when audit logs are full
impact: 40
Expand All @@ -1293,6 +1305,12 @@ queries:
action_mail_acct = root
admin_space_left_action = halt
```

Restart the service to load the new configuration values:

```
service auditd reload
```
- uid: mondoo-linux-security-changes-to-system-administration-scope-sudoers-is-collected
title: Ensure changes to system administration scope (sudoers) is collected
impact: 50
Expand Down Expand Up @@ -2314,7 +2332,7 @@ queries:
vi /etc/rsyslog.conf
..
$FileCreateMode 0640
$umask 0077
$Umask 0077
```

Configuration for creation, deletion and cleaning of volatile and temporary files:
Expand Down Expand Up @@ -2631,7 +2649,7 @@ queries:
sshd.config.params["LoginGraceTime"] >= 1
sshd.config.params["LoginGraceTime"] <= 60
docs:
desc: The `LoginGraceTime` parameter specifies the time allowed for successful authentication to the SSH server. The longer the grace period is, the more open unauthenticated connections can exist. Like other session controls, the grace period should be limited to appropriate organizational limits to ensure the service is available for needed access.
desc: The `LoginGraceTime` parameter specifies the time (in seconds) allowed for successful authentication to the SSH server. The longer the grace period is, the more open unauthenticated connections can exist. Like other session controls, the grace period should be limited to appropriate organizational limits to ensure the service is available for needed access.
remediation: |-
Edit the `/etc/ssh/sshd_config` file to set the `LoginGraceTime` parameter as follows:

Expand Down