# Kernel Security Parameters for Homelab
# Deploy to: /etc/sysctl.d/99-security.conf
# 
# Setup commands:
#   sudo cp config/sysctl/99-security.conf /etc/sysctl.d/
#   sudo sysctl -p /etc/sysctl.d/99-security.conf

# Network security
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.ip_forward = 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.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_syn_retries = 3
net.ipv4.tcp_synack_retries = 3

# IPv6 security (if enabled)
net.ipv6.conf.default.accept_redirects = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv6.conf.default.accept_source_route = 0
net.ipv6.conf.all.accept_source_route = 0

# Memory protection
kernel.dmesg_restrict = 1
kernel.kptr_restrict = 1
kernel.yama.ptrace_scope = 1