mirror of
https://github.com/BagelHole/DevOps-Security-Agent-Skills.git
synced 2026-08-22 12:49:53 +02:00
105 lines
2.8 KiB
Plaintext
105 lines
2.8 KiB
Plaintext
# Linux Kernel Security Hardening
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# Place in /etc/sysctl.d/99-security.conf
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# Apply with: sysctl -p /etc/sysctl.d/99-security.conf
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#------------------------------------------------------------------------------
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# NETWORK SECURITY
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#------------------------------------------------------------------------------
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# Disable IP forwarding (unless router)
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net.ipv4.ip_forward = 0
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net.ipv6.conf.all.forwarding = 0
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# Disable packet redirect sending
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net.ipv4.conf.all.send_redirects = 0
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net.ipv4.conf.default.send_redirects = 0
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# Disable ICMP redirect acceptance
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net.ipv4.conf.all.accept_redirects = 0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv4.conf.all.secure_redirects = 0
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net.ipv4.conf.default.secure_redirects = 0
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net.ipv6.conf.all.accept_redirects = 0
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net.ipv6.conf.default.accept_redirects = 0
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# Disable source routing
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net.ipv4.conf.all.accept_source_route = 0
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net.ipv4.conf.default.accept_source_route = 0
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net.ipv6.conf.all.accept_source_route = 0
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net.ipv6.conf.default.accept_source_route = 0
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# Log suspicious packets
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net.ipv4.conf.all.log_martians = 1
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net.ipv4.conf.default.log_martians = 1
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# Ignore ICMP broadcast requests
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net.ipv4.icmp_echo_ignore_broadcasts = 1
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# Ignore bogus ICMP error responses
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net.ipv4.icmp_ignore_bogus_error_responses = 1
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# Enable reverse path filtering (spoofing protection)
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net.ipv4.conf.all.rp_filter = 1
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net.ipv4.conf.default.rp_filter = 1
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# Enable TCP SYN cookies (SYN flood protection)
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net.ipv4.tcp_syncookies = 1
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# Disable IPv6 router advertisements
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net.ipv6.conf.all.accept_ra = 0
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net.ipv6.conf.default.accept_ra = 0
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# Disable IPv6 if not needed
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# net.ipv6.conf.all.disable_ipv6 = 1
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# net.ipv6.conf.default.disable_ipv6 = 1
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#------------------------------------------------------------------------------
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# KERNEL SECURITY
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#------------------------------------------------------------------------------
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# Enable ASLR
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kernel.randomize_va_space = 2
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# Restrict access to kernel pointers
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kernel.kptr_restrict = 2
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# Restrict dmesg access
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kernel.dmesg_restrict = 1
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# Restrict ptrace scope
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kernel.yama.ptrace_scope = 1
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# Disable magic SysRq key
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kernel.sysrq = 0
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# Restrict unprivileged user namespaces
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# kernel.unprivileged_userns_clone = 0
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# Restrict loading TTY line disciplines
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dev.tty.ldisc_autoload = 0
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# Restrict userfaultfd to privileged users
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vm.unprivileged_userfaultfd = 0
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# Restrict BPF
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kernel.unprivileged_bpf_disabled = 1
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net.core.bpf_jit_harden = 2
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# Restrict perf events
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kernel.perf_event_paranoid = 3
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#------------------------------------------------------------------------------
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# FILE SYSTEM SECURITY
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#------------------------------------------------------------------------------
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# Restrict core dumps
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fs.suid_dumpable = 0
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# Restrict hardlinks and symlinks
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fs.protected_hardlinks = 1
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fs.protected_symlinks = 1
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# Protect FIFOs and regular files
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fs.protected_fifos = 2
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fs.protected_regular = 2
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