Skip to content

let os_hardening::sysctl make decisions about system_environment #276

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

let os_hardening::sysctl make decisions about system_environment #276

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 2 additions & 8 deletions manifests/init.pp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -100,13 +100,6 @@
# system environment configuration
# there may be differences when using kvm/lxc vs metal

# sysctl configuration doesn't work in docker:
$configure_sysctl = (
$system_environment != 'lxc' and
$system_environment != 'docker' and
$enable_sysctl_config
)

# Defaults for specific platforms
case $::osfamily {
'Debian','Suse': {
Expand Down Expand Up @@ -208,8 +201,9 @@
dry_run_on_unknown => $dry_run_on_unknown,
}

if $configure_sysctl {
if $enable_sysctl_config {
class { 'os_hardening::sysctl':
system_environment => $system_environment,
enable_module_loading => $enable_module_loading,
load_modules => $load_modules,
cpu_vendor => $cpu_vendor,
Expand Down
78 changes: 40 additions & 38 deletions manifests/sysctl.pp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
# Configures Kernel Parameters via sysctl
#
class os_hardening::sysctl (
String $system_environment = 'default',
Boolean $enable_module_loading = true,
Array $load_modules = [],
String $cpu_vendor = 'intel',
Expand Down Expand Up @@ -194,47 +195,48 @@
# * **64** - signalling of processes (term, kill, oom-kill)
# * **128** - reboot/poweroff
# * **256** - nicing of all RT tasks
if $enable_sysrq {
$limited_sysrq = String(4 + 16 + 32 + 64 + 128)
sysctl { 'kernel.sysrq': value => $limited_sysrq }
} else {
sysctl { 'kernel.sysrq': value => '0' }
}

# Enable stack protection by randomizing kernel va space
if $enable_stack_protection {
sysctl { 'kernel.randomize_va_space': value => '2' }
} else {
sysctl { 'kernel.randomize_va_space': value => '0' }
}
# Prevent core dumps with SUID. These are usually only needed by developers and may contain sensitive information.
sysctl { 'fs.suid_dumpable': value => String(bool2num($enable_core_dump)) }
if $system_environment != 'lxc' and $system_environment != 'docker' {
if $enable_sysrq {
$limited_sysrq = String(4 + 16 + 32 + 64 + 128)
sysctl { 'kernel.sysrq': value => $limited_sysrq }
} else {
sysctl { 'kernel.sysrq': value => '0' }
}

# configure for module hardening
# if modules cannot be loaded at runtime, they must all
# be pre-configured in initramfs
if $enable_module_loading == false {
case $::operatingsystem {
debian, ubuntu, cumuluslinux: {
file { '/etc/initramfs-tools/modules':
ensure => file,
content => template('os_hardening/modules.erb'),
owner => 'root',
group => 'root',
mode => '0400',
notify => Exec['update-initramfs'],
}

exec { 'update-initramfs':
command => '/usr/sbin/update-initramfs -u',
refreshonly => true,
}
}
default: {
# TODO
# Enable stack protection by randomizing kernel va space
if $enable_stack_protection {
sysctl { 'kernel.randomize_va_space': value => '2' }
} else {
sysctl { 'kernel.randomize_va_space': value => '0' }
}
# Prevent core dumps with SUID. These are usually only needed by developers and may contain sensitive information.
sysctl { 'fs.suid_dumpable': value => String(bool2num($enable_core_dump)) }

# configure for module hardening
# if modules cannot be loaded at runtime, they must all
# be pre-configured in initramfs
if $enable_module_loading == false {
case $::operatingsystem {
debian, ubuntu, cumuluslinux: {
file { '/etc/initramfs-tools/modules':
ensure => file,
content => template('os_hardening/modules.erb'),
owner => 'root',
group => 'root',
mode => '0400',
notify => Exec['update-initramfs'],
}

exec { 'update-initramfs':
command => '/usr/sbin/update-initramfs -u',
refreshonly => true,
}
}
default: {
# TODO
}
}
}
}

}