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From 6f11431ae6ff21170b11e6777141cbe33a8ffe42 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20=C4=8Cern=C3=BD?= <jcerny@redhat.com>
Date: Tue, 5 Dec 2023 16:05:37 +0100
Subject: [PATCH 08/14] New Rule networkmanager_dns_mode
Patch-name: scap-security-guide-0.1.71-new_rule_dns_mode_nm-PR_11160.patch
Patch-status: New Rule networkmanager_dns_mode
---
components/networkmanager.yml | 5 +++
.../srg_gpos/SRG-OS-000480-GPOS-00227.yml | 4 +++
.../system/network/networkmanager/group.yml | 7 ++++
.../ansible/shared.yml | 14 ++++++++
.../networkmanager_dns_mode/bash/shared.sh | 11 ++++++
.../networkmanager_dns_mode/oval/shared.xml | 12 +++++++
.../policy/stig/shared.yml | 15 ++++++++
.../networkmanager_dns_mode/rule.yml | 34 +++++++++++++++++++
.../tests/correct.pass.sh | 8 +++++
.../tests/correct_default.pass.sh | 8 +++++
.../tests/missing.fail.sh | 4 +++
.../tests/wrong_value.fail.sh | 8 +++++
.../var_networkmanager_dns_mode.var | 19 +++++++++++
shared/applicability/package.yml | 2 ++
shared/references/cce-redhat-avail.txt | 1 -
15 files changed, 151 insertions(+), 1 deletion(-)
create mode 100644 components/networkmanager.yml
create mode 100644 linux_os/guide/system/network/networkmanager/group.yml
create mode 100644 linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/ansible/shared.yml
create mode 100644 linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/bash/shared.sh
create mode 100644 linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/oval/shared.xml
create mode 100644 linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/policy/stig/shared.yml
create mode 100644 linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/rule.yml
create mode 100644 linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/correct.pass.sh
create mode 100644 linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/correct_default.pass.sh
create mode 100644 linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/missing.fail.sh
create mode 100644 linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/wrong_value.fail.sh
create mode 100644 linux_os/guide/system/network/networkmanager/var_networkmanager_dns_mode.var
diff --git a/components/networkmanager.yml b/components/networkmanager.yml
new file mode 100644
index 0000000000..75d54b9490
--- /dev/null
+++ b/components/networkmanager.yml
@@ -0,0 +1,5 @@
+name: NetworkManager
+packages:
+- NetworkManager
+rules:
+- networkmanager_dns_mode
diff --git a/controls/srg_gpos/SRG-OS-000480-GPOS-00227.yml b/controls/srg_gpos/SRG-OS-000480-GPOS-00227.yml
index 1aceb0b187..be60a154c1 100644
--- a/controls/srg_gpos/SRG-OS-000480-GPOS-00227.yml
+++ b/controls/srg_gpos/SRG-OS-000480-GPOS-00227.yml
@@ -225,6 +225,10 @@ controls:
- set_firewalld_default_zone
- firewalld_sshd_port_enabled
+ # NetworkManger
+ - networkmanager_dns_mode
+ - var_networkmanager_dns_mode=none
+
# misc
- enable_authselect
- no_host_based_files
diff --git a/linux_os/guide/system/network/networkmanager/group.yml b/linux_os/guide/system/network/networkmanager/group.yml
new file mode 100644
index 0000000000..4abf48ed96
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/group.yml
@@ -0,0 +1,7 @@
+documentation_complete: true
+
+title: 'Network Manager'
+
+description: |-
+ The NetworkManager daemon configures a variety of network connections.
+ This section discusses how to configure NetworkManager.
diff --git a/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/ansible/shared.yml b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/ansible/shared.yml
new file mode 100644
index 0000000000..b416038bd9
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/ansible/shared.yml
@@ -0,0 +1,14 @@
+# platform = multi_platform_all
+# reboot = false
+# strategy = configure
+# complexity = low
+# disruption = low
+
+{{{ ansible_instantiate_variables("var_networkmanager_dns_mode") }}}
+
+{{{ ansible_ini_file_set("/etc/NetworkManager/NetworkManager.conf", "main", "dns", "{{ var_networkmanager_dns_mode }}") }}}
+
+- name: "{{{ rule_title }}} - Ensure Network Manager"
+ ansible.builtin.systemd:
+ name: NetworkManager
+ state: reloaded
diff --git a/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/bash/shared.sh b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/bash/shared.sh
new file mode 100644
index 0000000000..88491d288d
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/bash/shared.sh
@@ -0,0 +1,11 @@
+# platform = multi_platform_all
+# reboot = false
+# strategy = configure
+# complexity = low
+# disruption = medium
+
+{{{ bash_instantiate_variables("var_networkmanager_dns_mode") }}}
+
+{{{ bash_ini_file_set("/etc/NetworkManager/NetworkManager.conf", "main", "dns", "$var_networkmanager_dns_mode") }}}
+
+systemctl reload NetworkManager
diff --git a/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/oval/shared.xml b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/oval/shared.xml
new file mode 100644
index 0000000000..cb07c9a9ed
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/oval/shared.xml
@@ -0,0 +1,12 @@
+{{{
+oval_check_ini_file(
+ path="/etc/NetworkManager/NetworkManager.conf",
+ section="main",
+ parameter="dns",
+ value="default|none",
+ missing_parameter_pass=false,
+ application="NetworkManager",
+ multi_value=false,
+ missing_config_file_fail=true
+)
+}}}
diff --git a/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/policy/stig/shared.yml b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/policy/stig/shared.yml
new file mode 100644
index 0000000000..b644587b41
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/policy/stig/shared.yml
@@ -0,0 +1,15 @@
+checktext: |-
+ [main]
+ dns=none
+
+ If the dns key under main does not exist or is not set to "none" or "default", this is a finding.
+
+fixtext: |-
+ Configure NetworkManager in RHEL 9 to use a DNS mode.
+
+ In "/etc/NetworkManager/NetworkManager.conf" add the following line in the "[main]" section:
+
+ dns = none
+
+srg_requirement: |-
+ {{ full_name }} must configure a DNS processing mode set be Network Manager.
diff --git a/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/rule.yml b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/rule.yml
new file mode 100644
index 0000000000..8b703cb2f1
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/rule.yml
@@ -0,0 +1,34 @@
+documentation_complete: true
+
+prodtype: rhel9
+
+title: 'NetworkManager DNS Mode Must Be Must Configured'
+
+description:
+ The DNS processing mode in NetworkManager describes how DNS is processed on the system.
+ Depending the mode some changes the system's DNS may not be respected.
+
+rationale:
+ To ensure that DNS resolver settings are respected, a DNS mode in NetworkManager must be configured.
+
+severity: medium
+
+identifiers:
+ cce@rhel9: CCE-86805-9
+
+references:
+ disa: CCI-000366
+ nist: CM-6(b)
+ srg: SRG-OS-000480-GPOS-00227
+
+ocil_clause: 'the dns key under main does not exist or is not set to "none" or "default"'
+
+
+ocil: |-
+ Verify that {{{ full_name }}} has a DNS mode configured in Network Manager.
+
+ $ NetworkManager --print-config
+ [main]
+ dns={{{ xccdf_value("var_networkmanager_dns_mode") }}}
+
+platform: package[NetworkManager]
diff --git a/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/correct.pass.sh b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/correct.pass.sh
new file mode 100644
index 0000000000..7af3e14fc3
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/correct.pass.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+# variables = var_networkmanager_dns_mode = none
+# packages = NetworkManager
+
+cat > /etc/NetworkManager/NetworkManager.conf << EOM
+[main]
+dns=none
+EOM
diff --git a/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/correct_default.pass.sh b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/correct_default.pass.sh
new file mode 100644
index 0000000000..a19040e2d5
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/correct_default.pass.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+# variables = var_networkmanager_dns_mode = default
+# packages = NetworkManager
+
+cat > /etc/NetworkManager/NetworkManager.conf << EOM
+[main]
+dns=default
+EOM
diff --git a/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/missing.fail.sh b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/missing.fail.sh
new file mode 100644
index 0000000000..b81d82c807
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/missing.fail.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+# variables = var_networkmanager_dns_mode = default
+
+sed '/^dns=.*$/d' /etc/NetworkManager/NetworkManager.conf
diff --git a/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/wrong_value.fail.sh b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/wrong_value.fail.sh
new file mode 100644
index 0000000000..6de904b372
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/networkmanager_dns_mode/tests/wrong_value.fail.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+# variables = var_networkmanager_dns_mode = default
+# packages = NetworkManager
+
+cat > /etc/NetworkManager/NetworkManager.conf << EOM
+[main]
+dns=dnsmasq
+EOM
diff --git a/linux_os/guide/system/network/networkmanager/var_networkmanager_dns_mode.var b/linux_os/guide/system/network/networkmanager/var_networkmanager_dns_mode.var
new file mode 100644
index 0000000000..1be615dff9
--- /dev/null
+++ b/linux_os/guide/system/network/networkmanager/var_networkmanager_dns_mode.var
@@ -0,0 +1,19 @@
+documentation_complete: true
+
+title: 'NetoworkManager DNS Mode'
+
+type: string
+
+description: |-
+ This sets how NetworkManager handles DNS.
+
+ none - NetworkManager will not modify resolv.conf.
+ default - NetworkManager will update /etc/resolv.conf to reflect the nameservers provided by currently active connections.
+
+interactive: true
+
+operator: 'equals'
+
+options:
+ none: none
+ default: default
diff --git a/shared/applicability/package.yml b/shared/applicability/package.yml
index ee52a50f1f..4718c7cf71 100644
--- a/shared/applicability/package.yml
+++ b/shared/applicability/package.yml
@@ -87,3 +87,5 @@ args:
pkgname: zypper
openssh:
pkgname: openssh
+ networkmanager:
+ pkgname: NetworkManager
diff --git a/shared/references/cce-redhat-avail.txt b/shared/references/cce-redhat-avail.txt
index 538d9d488d..60663b117a 100644
--- a/shared/references/cce-redhat-avail.txt
+++ b/shared/references/cce-redhat-avail.txt
@@ -459,7 +459,6 @@ CCE-86799-4
CCE-86802-6
CCE-86803-4
CCE-86804-2
-CCE-86805-9
CCE-86806-7
CCE-86807-5
CCE-86808-3
--
2.43.0
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