xoxys.kernel/templates/etc/sysctl.d/local.conf.j2

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2019-11-03 23:22:18 +00:00
#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 %}
user.max_user_namespaces = 15076
{% endif %}