From 6f16d38311859a84313fa356a3f023c7ff02699b Mon Sep 17 00:00:00 2001
From: Jef Roosens <roosensjef@gmail.com>
Date: Mon, 13 Dec 2021 15:52:04 +0100
Subject: [PATCH] Added sysctl config

---
 main.yml                                      |  3 +-
 .../tasks/main.yml                            |  0
 roles/sysctl/files/sysctl.conf                | 70 +++++++++++++++++++
 roles/sysctl/handlers/main.yml                |  3 +
 roles/sysctl/tasks/main.yml                   |  9 +++
 5 files changed, 84 insertions(+), 1 deletion(-)
 rename roles/{net-security => networking}/tasks/main.yml (100%)
 create mode 100644 roles/sysctl/files/sysctl.conf
 create mode 100644 roles/sysctl/handlers/main.yml
 create mode 100644 roles/sysctl/tasks/main.yml

diff --git a/main.yml b/main.yml
index df118ba..33a511a 100644
--- a/main.yml
+++ b/main.yml
@@ -4,7 +4,8 @@
   become: yes
   roles:
     - install-base-packages
-    - net-security
+    - sysctl
+    - networking
     - set-hostname
     - docker
   tags: base
diff --git a/roles/net-security/tasks/main.yml b/roles/networking/tasks/main.yml
similarity index 100%
rename from roles/net-security/tasks/main.yml
rename to roles/networking/tasks/main.yml
diff --git a/roles/sysctl/files/sysctl.conf b/roles/sysctl/files/sysctl.conf
new file mode 100644
index 0000000..588d575
--- /dev/null
+++ b/roles/sysctl/files/sysctl.conf
@@ -0,0 +1,70 @@
+#
+# /etc/sysctl.conf - Configuration file for setting system variables
+# See /etc/sysctl.d/ for additional system variables.
+# See sysctl.conf (5) for information.
+#
+
+#kernel.domainname = example.com
+
+# Uncomment the following to stop low-level messages on console
+#kernel.printk = 3 4 1 3
+
+###################################################################
+# Functions previously found in netbase
+#
+
+# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
+# Turn on Source Address Verification in all interfaces to
+# prevent some spoofing attacks
+#net.ipv4.conf.default.rp_filter=1
+#net.ipv4.conf.all.rp_filter=1
+
+# Uncomment the next line to enable TCP/IP SYN cookies
+# See http://lwn.net/Articles/277146/
+# Note: This may impact IPv6 TCP sessions too
+#net.ipv4.tcp_syncookies=1
+
+# Uncomment the next line to enable packet forwarding for IPv4
+#net.ipv4.ip_forward=1
+
+# Uncomment the next line to enable packet forwarding for IPv6
+#  Enabling this option disables Stateless Address Autoconfiguration
+#  based on Router Advertisements for this host
+#net.ipv6.conf.all.forwarding=1
+
+
+###################################################################
+# Additional settings - these settings can improve the network
+# security of the host and prevent against some network attacks
+# including spoofing attacks and man in the middle attacks through
+# redirection. Some network environments, however, require that these
+# settings are disabled so review and enable them as needed.
+#
+# Do not accept ICMP redirects (prevent MITM attacks)
+#net.ipv4.conf.all.accept_redirects = 0
+#net.ipv6.conf.all.accept_redirects = 0
+# _or_
+# Accept ICMP redirects only for gateways listed in our default
+# gateway list (enabled by default)
+# net.ipv4.conf.all.secure_redirects = 1
+#
+# Do not send ICMP redirects (we are not a router)
+#net.ipv4.conf.all.send_redirects = 0
+#
+# Do not accept IP source route packets (we are not a router)
+#net.ipv4.conf.all.accept_source_route = 0
+#net.ipv6.conf.all.accept_source_route = 0
+#
+# Log Martian Packets
+#net.ipv4.conf.all.log_martians = 1
+#
+
+###################################################################
+# Magic system request Key
+# 0=disable, 1=enable all, >1 bitmask of sysrq functions
+# See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html
+# for what other values do
+#kernel.sysrq=438
+
+# Allows the kernel to restart after a panic
+kernel.panic = 10
diff --git a/roles/sysctl/handlers/main.yml b/roles/sysctl/handlers/main.yml
new file mode 100644
index 0000000..564774c
--- /dev/null
+++ b/roles/sysctl/handlers/main.yml
@@ -0,0 +1,3 @@
+---
+- name: reboot
+  reboot: {}
diff --git a/roles/sysctl/tasks/main.yml b/roles/sysctl/tasks/main.yml
new file mode 100644
index 0000000..abfa9e9
--- /dev/null
+++ b/roles/sysctl/tasks/main.yml
@@ -0,0 +1,9 @@
+---
+- name: Copy over sysctl config file
+  copy:
+    src: sysctl.conf
+    dest: /etc/sysctl.conf
+    owner: root
+    group: root
+    mode: '644'
+  notify: reboot