mirror of
https://github.com/Kicksecure/security-misc.git
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6a4c493213
and use a name starting with double digits to make it easier to disable settings using a lexically higher config file
115 lines
3.4 KiB
Plaintext
115 lines
3.4 KiB
Plaintext
## Copyright (C) 2019 - 2019 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
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## See the file COPYING for copying conditions.
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## Disables coredumps. This setting may be overwritten by systemd so this may not be useful.
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## security-misc also disables coredumps in other ways.
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kernel.core_pattern=|/bin/false
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## Restricts the kernel log to root only.
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kernel.dmesg_restrict=1
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## Makes some data spoofing attacks harder.
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fs.protected_fifos=2
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fs.protected_regular=2
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## Hardens the BPF JIT compiler and restricts it to root.
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kernel.unprivileged_bpf_disabled=1
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net.core.bpf_jit_harden=2
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## Quote https://www.kernel.org/doc/html/latest/admin-guide/sysctl/kernel.html
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##
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## kexec_load_disabled:
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##
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## A toggle indicating if the kexec_load syscall has been disabled. This value defaults to 0 (false: kexec_load enabled), but can be set to 1 (true: kexec_load disabled). Once true, kexec can no longer be used, and the toggle cannot be set back to false. This allows a kexec image to be loaded before disabling the syscall, allowing a system to set up (and later use) an image without it being altered. Generally used together with the "modules_disabled" sysctl.
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## Disables kexec which can be used to replace the running kernel.
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kernel.kexec_load_disabled=1
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## Hides kernel addresses in various files in /proc.
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## Kernel addresses can be very useful in certain exploits.
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##
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## https://kernsec.org/wiki/index.php/Bug_Classes/Kernel_pointer_leak
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kernel.kptr_restrict=2
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## Improves ASLR effectiveness for mmap.
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vm.mmap_rnd_bits=32
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vm.mmap_rnd_compat_bits=16
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## Restricts the use of ptrace to root. This might break some programs running under WINE.
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## A workaround for WINE would be to give the wineserver and wine-preloader ptrace capabilities. This can be done by running:
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##
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## sudo apt-get install libcap2-bin
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## sudo setcap cap_sys_ptrace=eip /usr/bin/wineserver
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## sudo setcap cap_sys_ptrace=eip /usr/bin/wine-preloader
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kernel.yama.ptrace_scope=2
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## Prevent setuid processes from creating coredumps.
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fs.suid_dumpable=0
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#### meta start
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#### project Kicksecure
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#### category networking and security
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#### description
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## TCP/IP stack hardening
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## Protects against time-wait assassination.
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## It drops RST packets for sockets in the time-wait state.
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net.ipv4.tcp_rfc1337=1
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## Disables 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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## Disables ICMP 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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## Ignores ICMP requests.
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net.ipv4.icmp_echo_ignore_all=1
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## Enables TCP syncookies.
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net.ipv4.tcp_syncookies=1
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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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## Enable reverse path filtering to prevent IP spoofing and
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## mitigate vulnerabilities such as CVE-2019-14899.
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## https://forums.whonix.org/t/enable-reverse-path-filtering/8594
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net.ipv4.conf.default.rp_filter=1
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net.ipv4.conf.all.rp_filter=1
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#### meta end
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## Disables SACK as it is commonly exploited and likely not needed.
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## https://forums.whonix.org/t/disabling-tcp-sack-dsack-fack/8109
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#net.ipv4.tcp_sack=0
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#net.ipv4.tcp_dsack=0
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#net.ipv4.tcp_fack=0
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#### meta start
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#### project Kicksecure
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#### category networking and security
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#### description
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## disable IPv4 TCP Timestamps
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net.ipv4.tcp_timestamps=0
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#### meta end
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