Initial commit

Signed-off-by: Alan Orth <alan.orth@gmail.com>

roles/common/templates/sysctl_Ubuntu.j2

@@ -0,0 +1,98 @@
+#
+# /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
+
+##############################################################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
+#
+
+# CIS Benchmark Adjustments
+# See: https://github.com/alanorth/securekickstarts
+kernel.randomize_va_space = 2 
+net.ipv4.ip_forward = 0 
+net.ipv4.conf.all.send_redirects = 0 
+net.ipv4.conf.default.send_redirects = 0 
+net.ipv4.conf.all.accept_source_route = 0 
+net.ipv4.conf.default.accept_source_route = 0 
+net.ipv4.conf.all.accept_redirects = 0 
+net.ipv4.conf.default.accept_redirects = 0 
+net.ipv4.conf.all.secure_redirects = 0 
+net.ipv4.conf.default.secure_redirects = 0 
+net.ipv4.conf.all.log_martians = 1 
+net.ipv4.conf.default.log_martians = 1 
+net.ipv4.icmp_echo_ignore_broadcasts = 1 
+net.ipv4.icmp_ignore_bogus_error_responses = 1 
+net.ipv4.conf.all.rp_filter = 1 
+net.ipv4.conf.default.rp_filter = 1 
+net.ipv4.tcp_syncookies = 1
+
+# TCP stuff
+# See: http://fasterdata.es.net/host-tuning/linux/
+# increase TCP max buffer size settable using setsockopt()
+net.core.rmem_max = 16777216 
+net.core.wmem_max = 16777216 
+# increase Linux autotuning TCP buffer limit 
+net.ipv4.tcp_rmem = 4096 87380 16777216
+net.ipv4.tcp_wmem = 4096 65536 16777216
+# increase the length of the processor input queue
+net.core.netdev_max_backlog = 30000
+{# Linode kernels don't have htcp, and kernels after 2.6.32 don't have buggy cubic #}
+{% if "linode" not in ansible_kernel and ansible_kernel < "2.6.33" %}
+# recommended default congestion control is htcp 
+net.ipv4.tcp_congestion_control=htcp
+{% endif %}
+# recommended for hosts with jumbo frames enabled
+#net.ipv4.tcp_mtu_probing=1