#jinja2: lstrip_blocks: True
{{ ansible_managed | comment }}
# Buffer Overflow Protection
kernel.exec-shield = 1
kernel.randomize_va_space = 2

# Restricting access to kernel pointers in the proc filesystem
kernel.kptr_restrict = 1

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Restrict unprivileged access to kernel syslog
kernel.dmesg_restrict = 1

# Restrict kernel address exposing
kernel.kptr_restrict = 2

# Limit scope for ptrace
kernel.yama.ptrace_scope = 2

# Avoid a smurf attack
net.ipv4.icmp_echo_ignore_broadcasts = 1

# Turn on protection for bad icmp error messages
net.ipv4.icmp_ignore_bogus_error_responses = 1

# Turn on syncookies for SYN flood attack protection
net.ipv4.tcp_syncookies = 1

# Turn on and log spoofed, source routed, and redirect packets
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.accept_source_route = 0

# No source routed packets here
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0

# Turn on reverse path filtering
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1

# Make sure no one can alter the routing tables
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

# Don't act as a router
net.ipv4.ip_forward = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0

# Make sure spoofed packets get logged
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1

# Turn off the tcp_timestamps
net.ipv4.tcp_timestamps = 0

# Disable IPv6 for all interfaces
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

# Disable ICMP routing redirects
net.ipv6.conf.all.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
{% if kernel_namespace_support_enabled | bool %}

user.max_user_namespaces = 15076
{% endif %}
{% if kernel_ipv4_ping_group_range is defined %}

net.ipv4.ping_group_range={{ kernel_ipv4_ping_group_range }}
{% endif %}