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This commit is contained in:
Charles N Wyble
2026-01-21 08:33:09 -05:00
parent 6c96f3c549
commit 1339705f9d
20 changed files with 3387 additions and 46 deletions
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113
config/99-cis-hardening.conf Normal file
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# CIS Debian 13 Benchmark - Kernel Hardening Configuration
# Implements CIS recommendations for kernel security parameters
# Network Configuration
net.ipv4.ip_forward = 0
net.ipv6.conf.all.forwarding = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1
# TCP Hardening
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 5
# IP Source Routing
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv6.conf.all.accept_source_route = 0
net.ipv6.conf.default.accept_source_route = 0
# ICMP Redirects
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
# ICMP Redirect Broadcast
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
# ICMP Rate Limiting
net.ipv4.icmp_ratelimit = 100
net.ipv4.icmp_ratemask = 88089
# IPv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
# Log Suspicious Packets
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1
# ExecShield Protection
kernel.exec-shield = 1
kernel.randomize_va_space = 2
# Core Dumps
kernel.core_pattern = |/bin/false
fs.suid_dumpable = 0
# Shared Memory
kernel.shmmax = 4294967295
kernel.shmall = 268435456
# Network Protection
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_sack = 1
net.ipv4.tcp_dsack = 1
# Protection against SYN flood attacks
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 5
# Log Invalid Packets
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1
# Ignore ICMP redirects
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
# Ignore Send Redirects
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
# Enable RFC-recommended source validation
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
# Disable IPv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
# ASLR
kernel.randomize_va_space = 2
# Disable magic SysRq key
kernel.sysrq = 0
# Limits on core dumps
fs.suid_dumpable = 0
# Restrict ptrace scope
kernel.yama.ptrace_scope = 1
# Disable kexec system call
kernel.kexec_load_disabled = 1
# AppArmor protection
kernel.apparmor_restrict_unprivileged_userns = 1
kernel.apparmor_restrict_unprivileged_io_uring = 1