#
# /etc/sysctl.conf - Configuration file for setting system variables
# See /etc/sysctl.d/ for additional system variables.
# See sysctl.conf (5) for information.
#

#kernel.domainname = example.com

# Uncomment the following to stop low-level messages on console
#kernel.printk = 3 4 1 3

##############################################################3
# Functions previously found in netbase
#

# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
# Turn on Source Address Verification in all interfaces to
# prevent some spoofing attacks
#net.ipv4.conf.default.rp_filter=1
#net.ipv4.conf.all.rp_filter=1

# Uncomment the next line to enable TCP/IP SYN cookies
# See http://lwn.net/Articles/277146/
# Note: This may impact IPv6 TCP sessions too
#net.ipv4.tcp_syncookies=1

# Uncomment the next line to enable packet forwarding for IPv4
#net.ipv4.ip_forward=1

# Uncomment the next line to enable packet forwarding for IPv6
#  Enabling this option disables Stateless Address Autoconfiguration
#  based on Router Advertisements for this host
#net.ipv6.conf.all.forwarding=1


###################################################################
# Additional settings - these settings can improve the network
# security of the host and prevent against some network attacks
# including spoofing attacks and man in the middle attacks through
# redirection. Some network environments, however, require that these
# settings are disabled so review and enable them as needed.
#
# Do not accept ICMP redirects (prevent MITM attacks)
#net.ipv4.conf.all.accept_redirects = 0
#net.ipv6.conf.all.accept_redirects = 0
# _or_
# Accept ICMP redirects only for gateways listed in our default
# gateway list (enabled by default)
# net.ipv4.conf.all.secure_redirects = 1
#
# Do not send ICMP redirects (we are not a router)
#net.ipv4.conf.all.send_redirects = 0
#
# Do not accept IP source route packets (we are not a router)
#net.ipv4.conf.all.accept_source_route = 0
#net.ipv6.conf.all.accept_source_route = 0
#
# Log Martian Packets
#net.ipv4.conf.all.log_martians = 1
#

###################################################################
# Magic system request Key
# 0=disable, 1=enable all, >1 bitmask of sysrq functions
# See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html
# for what other values do
#kernel.sysrq=438

kernel.pid_max=3072000
fs.file-max=6815744
kernel.sem=1000 128000 1028 2512
kernel.panic=30
vm.mmap_min_addr=65536
net.ipv4.tcp_syncookies=1
net.ipv4.tcp_timestamps=0
net.ipv4.conf.all.accept_redirects=0
net.ipv4.conf.all.log_martians=1
net.ipv4.conf.all.rp_filter=2
net.ipv4.conf.all.accept_source_route=0
net.ipv4.icmp_echo_ignore_broadcasts=1
net.ipv4.icmp_ignore_bogus_error_responses=1
net.ipv4.conf.all.promote_secondaries=1
vm.swappiness=40
net.ipv4.ip_nonlocal_bind=1
net.ipv4.conf.all.arp_announce=2
net.core.rmem_max=33554432
net.core.wmem_max=33554432
net.core.netdev_max_backlog=182757
net.ipv4.tcp_rmem=4096 87380 33554432
net.ipv4.tcp_wmem=4096 65536 33554432
vm.heap_stack_gap=1048576
net.netfilter.nf_conntrack_tcp_timeout_established=86400
fs.protected_hardlinks=0
fs.protected_symlinks=0
kernel.grsecurity.rwxmap_logging=0
kernel.grsecurity.exec_logging=0
kernel.grsecurity.resource_logging=1
kernel.grsecurity.chroot_execlog=1
kernel.grsecurity.audit_ptrace=1
kernel.grsecurity.signal_logging=1
kernel.grsecurity.forkfail_logging=1
kernel.grsecurity.timechange_logging=1
kernel.grsecurity.audit_mount=0
kernel.grsecurity.audit_chdir=0
kernel.grsecurity.chroot_caps=1
kernel.grsecurity.chroot_deny_bad_rename=1
kernel.grsecurity.chroot_deny_sysctl=1
kernel.grsecurity.chroot_restrict_nice=1
kernel.grsecurity.chroot_deny_unix=1
kernel.grsecurity.chroot_findtask=1
kernel.grsecurity.chroot_deny_shmat=1
kernel.grsecurity.chroot_deny_mknod=1
kernel.grsecurity.chroot_deny_fchdir=1
kernel.grsecurity.chroot_deny_chmod=1
kernel.grsecurity.chroot_enforce_chdir=1
kernel.grsecurity.chroot_deny_pivot=1
kernel.grsecurity.chroot_deny_chroot=1
kernel.grsecurity.fifo_restrictions=1
kernel.grsecurity.linking_restrictions=1
kernel.grsecurity.sysfs_restrict_bypass_gid=0
kernel.grsecurity.enforce_sysfs_restrict=1
kernel.grsecurity.harden_ptrace=1
kernel.grsecurity.ptrace_readexec=1
kernel.grsecurity.consistent_setxid=1
kernel.grsecurity.harden_ipc=1
kernel.grsecurity.harden_tty=1
kernel.grsecurity.dmesg=1
kernel.grsecurity.deter_bruteforce=0
kernel.grsecurity.tpe=0
kernel.grsecurity.tpe_invert=0
kernel.grsecurity.tpe_restrict_all=0
kernel.grsecurity.socket_all=5002
kernel.grsecurity.socket_client=5003
kernel.grsecurity.socket_server=5004
kernel.grsecurity.tpe_gid=5005
kernel.grsecurity.grsec_lock=0
user.max_user_namespaces=0
kernel.unprivileged_bpf_disabled=1