72 lines
1.9 KiB
Plaintext
72 lines
1.9 KiB
Plaintext
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#jinja2: lstrip_blocks: True
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{{ ansible_managed | comment }}
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# Buffer Overflow Protection
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kernel.exec-shield = 1
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kernel.randomize_va_space = 2
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# Restricting access to kernel pointers in the proc filesystem
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kernel.kptr_restrict = 1
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# Controls the System Request debugging functionality of the kernel
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kernel.sysrq = 0
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# Restrict unprivileged access to kernel syslog
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kernel.dmesg_restrict = 1
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# Restrict kernel address exposing
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kernel.kptr_restrict = 2
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# Limit scope for ptrace
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kernel.yama.ptrace_scope = 2
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# Avoid a smurf attack
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net.ipv4.icmp_echo_ignore_broadcasts = 1
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# Turn on protection for bad icmp error messages
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net.ipv4.icmp_ignore_bogus_error_responses = 1
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# Turn on syncookies for SYN flood attack protection
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net.ipv4.tcp_syncookies = 1
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# Turn on and log spoofed, source routed, and redirect packets
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net.ipv4.conf.all.log_martians = 1
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net.ipv4.conf.default.accept_source_route = 0
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# No source routed packets here
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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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# Turn on reverse path filtering
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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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# Make sure no one can alter the routing tables
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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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# Don't act as a router
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net.ipv4.ip_forward = 0
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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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# Make sure spoofed packets get logged
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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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# Turn off the tcp_timestamps
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net.ipv4.tcp_timestamps = 0
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# Disable IPv6 for all interfaces
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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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# Disable ICMP routing redirects
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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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{% if kernel_namespace_support_enabled %}
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user.max_user_namespaces = 15076
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{% endif %}
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