1769288238
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{
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boot.kernel.sysctl = {
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"fs.suid_dumpable" = 0;
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# prevent pointer leaks
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"kernel.kptr_restrict" = 2;
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# restrict kernel log to CAP_SYSLOG capability
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"kernel.dmesg_restrict" = 1;
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# Note: certian container runtimes or browser sandboxes might rely on the following
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# restrict eBPF to the CAP_BPF capability
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"kernel.unprivileged_bpf_disabled" = 1;
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# should be enabled along with bpf above
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# "net.core.bpf_jit_harden" = 2;
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# restrict loading TTY line disciplines to the CAP_SYS_MODULE
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"dev.tty.ldisk_autoload" = 0;
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# prevent exploit of use-after-free flaws
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"vm.unprivileged_userfaultfd" = 0;
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# kexec is used to boot another kernel during runtime and can be abused
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"kernel.kexec_load_disabled" = 1;
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# Kernel self-protection
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# SysRq exposes a lot of potentially dangerous debugging functionality to unprivileged users
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# 4 makes it so a user can only use the secure attention key. A value of 0 would disable completely
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"kernel.sysrq" = 0;
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# disable unprivileged user namespaces, Note: Docker, NH, and other apps may need this
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# "kernel.unprivileged_userns_clone" = 0; # Set to 1 because it makes NH and other programs fail
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# This should be set to 0 if you don't rely on flatpak, NH, Docker, etc.
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"kernel.unprivileged_userns_clone" = 1;
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# restrict all usage of performance events to the CAP_PERFMON capability
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"kernel.perf_event_paranoid" = 3;
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# Network
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# protect against SYN flood attacks (denial of service attack)
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"net.ipv4.tcp_syncookies" = 1;
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# protection against TIME-WAIT assassination
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"net.ipv4.tcp_rfc1337" = 1;
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# enable source validation of packets received (prevents IP spoofing)
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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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"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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# Protect against IP spoofing
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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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"net.ipv4.conf.all.send_redirects" = 0;
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"net.ipv4.conf.default.send_redirects" = 0;
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# prevent man-in-the-middle attacks
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"net.ipv4.icmp_echo_ignore_all" = 1;
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# ignore ICMP request, helps avoid Smurf attacks
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"net.ipv4.conf.all.forwarding" = 0;
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"net.ipv4.conf.default.accept_source_route" = 0;
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"net.ipv4.conf.all.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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# Reverse path filtering causes the kernel to do source validation of
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"net.ipv6.conf.all.forwarding" = 0;
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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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## TCP hardening
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# Prevent bogus ICMP errors from filling up logs.
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"net.ipv4.icmp_ignore_bogus_error_responses" = 1;
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# Userspace
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# restrict usage of ptrace
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# "kernel.yama.ptrace_scope" = 2; # breaks anti-cheat
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# ASLR memory protection (64-bit systems)
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"vm.mmap_rnd_bits" = 32;
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"vm.mmap_rnd_compat_bits" = 16;
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# only permit symlinks to be followed when outside of a world-writable sticky directory
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"fs.protected_symlinks" = 1;
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"fs.protected_hardlinks" = 1;
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# Prevent creating files in potentially attacker-controlled environments
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"fs.protected_fifos" = 2;
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"fs.protected_regular" = 2;
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# Randomize memory
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"kernel.randomize_va_space" = 2;
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# Exec Shield (Stack protection)
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"kernel.exec-shield" = 1;
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## TCP optimization
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# TCP Fast Open is a TCP extension that reduces network latency by packing
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# data in the sender’s initial TCP SYN. Setting 3 = enable TCP Fast Open for
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# both incoming and outgoing connections:
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"net.ipv4.tcp_fastopen" = 3;
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# Bufferbloat mitigations + slight improvement in throughput & latency
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"net.ipv4.tcp_congestion_control" = "bbr";
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"net.core.default_qdisc" = "cake";
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};
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boot.kernelParams = [
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# "systemd.unified_cgroup_hierarchy=1"
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# "cgroup_no_v1=all"
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"amd_iommu=force_isolation"
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"debugfs=off"
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"efi=disable_early_pci_dma"
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"gather_data_sampling=force"
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"intel_iommu=on"
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"iommu.passthrough=0"
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"iommu.strict=1"
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"iommu=force"
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# "lockdown=integrity" # confidentiality
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"kvm_amd.sev=1"
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"kvm_amd.sev_es=1"
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"kvm_amd.sev_snp=1"
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# "mitigations=auto,nosmt"
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"module.sig_enforce=1"
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"page_alloc.shuffle=1"
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"randomize_kstack_offset=on"
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"vsyscall=none"
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];
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boot.blacklistedKernelModules =
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[
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# Obscure networking protocols
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"dccp" # Datagram Congestion Control Protocol
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"sctp" # Stream Control Transmission Protocol
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"rds" # Reliable Datagram Sockets
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"tipc" # Transparent Inter-Process Communication
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"n-hdlc" # High-level Data Link Control
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"ax25" # Amateur X.25
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"netrom" # NetRom
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"x25" # X.25
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"rose"
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"decnet"
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"econet"
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"af_802154" # IEEE 802.15.4
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"ipx" # Internetwork Packet Exchange
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"appletalk"
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"psnap" # SubnetworkAccess Protocol
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"p8023" # Novell raw IEE 802.3
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"p8022" # IEE 802.3
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"can" # Controller Area Network
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"atm"
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# Various rare filesystems
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"cramfs"
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"freevxfs"
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"jffs2"
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"hfs"
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"hfsplus"
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"udf"
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# "squashfs" # compressed read-only file system used for Live CDs
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# "cifs" # cmb (Common Internet File System)
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# "nfs" # Network File System
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# "nfsv3"
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# "nfsv4"
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# "ksmbd" # SMB3 Kernel Server
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# "gfs2" # Global File System 2
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# vivid driver is only useful for testing purposes and has been the
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# cause of privilege escalation vulnerabilities
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# "vivid"
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]
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++ [
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# Various framebuffer drivers
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# "aty128fb"
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# "atyfb"
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# "radeonfb"
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# "cirrusfb"
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"cyber2000fb"
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"cyblafb"
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"gx1fb"
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"hgafb"
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# "i810fb"
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# "intelfb"
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# "kyrofb"
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"lxfb"
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"matroxfb_base"
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"neofb"
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# "nvidiafb"
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"pm2fb"
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# "rivafb"
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"s1d13xxxfb"
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# "savagefb"
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"sisfb"
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# "sstfb"
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# "tdfxfb"
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# "tridentfb"
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"vesafb"
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"vfb"
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# "viafb"
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"vt8623fb"
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"udlfb"
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];
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}
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