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play around with systemd hardening

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This commit is contained in:
mwiegand 2022-03-27 13:29:58 +02:00
parent b2b6f08b86
commit 8b3f9d7736
4 changed files with 213 additions and 0 deletions
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55
doc/test_protect.service Normal file
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@ -0,0 +1,55 @@
[Unit]
Description=TEST
[Service]
Type=oneshot
ExecStart=/opt/test
DynamicUser=yes
UMask=077
ProtectSystem=strict
ProtectHome=yes
PrivateTmp=yes
PrivateDevices=yes # DevicePolicy=closed
PrivateNetwork=yes
IPAddressDeny=any
PrivateUsers=yes
ProtectHostname=yes
ProtectClock=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectKernelLogs=yes
ProtectControlGroups=yes
RestrictAddressFamilies=none
RestrictFileSystems=ext4 tmpfs zfs
RestrictNamespaces=yes
LockPersonality=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictSUIDSGID=yes
RemoveIPC=yes
PrivateMounts=yes
SystemCallFilter=~@swap
SystemCallFilter=~@resources
SystemCallFilter=~@reboot
SystemCallFilter=~@raw-io
SystemCallFilter=~@privileged
SystemCallFilter=~@obsolete
SystemCallFilter=~@mount
SystemCallFilter=~@module
SystemCallFilter=~@debug
SystemCallFilter=~@cpu-emulation
SystemCallFilter=~@clock
CapabilityBoundingSet=
ProtectProc=invisible
ProcSubset=pid
NoNewPrivileges=yes
SystemCallArchitectures=native
ReadOnlyPaths=/
NoExecPaths=/
ExecPaths=/opt/test /bin/bash /lib
[Install]
WantedBy=multi-user.target

55
doc/test_protect_2.service Normal file
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@ -0,0 +1,55 @@
[Unit]
Description=TEST
[Service]
Type=oneshot
ExecStart=/opt/test
# user
UMask=077
DynamicUser=yes
PrivateUsers=yes
RestrictSUIDSGID=yes
NoNewPrivileges=yes
LockPersonality=yes
RemoveIPC=yes
# fs
ProtectSystem=strict
ProtectHome=yes
PrivateTmp=yes
PrivateDevices=yes
PrivateNetwork=yes
ProtectProc=invisible
ProcSubset=pid
PrivateMounts=yes
RestrictFileSystems=ext4 tmpfs zfs
NoExecPaths=/
ExecPaths=/opt/test /bin /lib /lib64 /usr
TemporaryFileSystem=/var
TemporaryFileSystem=/var
# network
IPAddressDeny=any
RestrictAddressFamilies=none
# syscall
SystemCallArchitectures=native
SystemCallFilter=~@swap ~@resources ~@reboot ~@raw-io ~@privileged ~@obsolete ~@mount ~@module ~@debug ~@cpu-emulation ~@clock
# else
ProtectHostname=yes
ProtectClock=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectKernelLogs=yes
ProtectControlGroups=yes
RestrictNamespaces=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
CapabilityBoundingSet=
[Install]
WantedBy=multi-user.target

54
doc/test_temp.service Normal file
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@ -0,0 +1,54 @@
[Unit]
Description=TEST
[Service]
Type=oneshot
ExecStart=/opt/test
TemporaryFileSystem=/
BindReadOnlyPaths=/opt/test /bin /lib /lib64 /usr
UMask=077
ProtectHome=yes
PrivateTmp=yes
PrivateDevices=yes
PrivateNetwork=yes
IPAddressDeny=any
ProtectHostname=yes
ProtectClock=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectKernelLogs=yes
ProtectControlGroups=yes
RestrictAddressFamilies=none
RestrictFileSystems=ext4 tmpfs zfs
RestrictNamespaces=yes
LockPersonality=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictSUIDSGID=yes
RemoveIPC=yes
PrivateMounts=yes
SystemCallFilter=~@swap
SystemCallFilter=~@resources
SystemCallFilter=~@reboot
SystemCallFilter=~@raw-io
SystemCallFilter=~@privileged
SystemCallFilter=~@obsolete
SystemCallFilter=~@mount
SystemCallFilter=~@module
SystemCallFilter=~@debug
SystemCallFilter=~@cpu-emulation
SystemCallFilter=~@clock
CapabilityBoundingSet=
ProtectProc=invisible
ProcSubset=pid
NoNewPrivileges=yes
SystemCallArchitectures=native
[Install]
WantedBy=multi-user.target

49
libs/systemd.py
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@ -41,3 +41,52 @@ def generate_unitfile(data):
data=dict(sorted(data.items(), key=segment_order)),
order=order
).lstrip()
# wip
def protection():
return {
# user
'UMask': '077',
'DynamicUser': 'yes',
'PrivateUsers': 'yes',
'RestrictSUIDSGID': 'yes',
'NoNewPrivileges': 'yes',
'LockPersonality': 'yes',
'RemoveIPC': 'yes',
# fs
'ProtectSystem': 'strict',
'ProtectHome': 'yes',
'PrivateTmp': 'yes',
'PrivateDevices': 'yes',
'ProtectProc': 'invisible',
'ProcSubset': 'pid',
'PrivateMounts': 'yes',
'RestrictFileSystems': {'ext4', 'tmpfs', 'zfs'},
'NoExecPaths': {'/'},
'ExecPaths': {'/bin', '/sbin', '/lib', '/lib64', '/usr'},
'TemporaryFileSystem': {'/var'},
# network
'IPAddressDeny': 'any',
'PrivateNetwork': 'yes',
'RestrictAddressFamilies': 'none',
# syscall
'SystemCallArchitectures': 'native',
'SystemCallFilter': '~@swap @resources @reboot @raw-io @privileged @obsolete @mount @module @debug @cpu-emulation @clock',
# else
'ProtectHostname': 'yes',
'ProtectClock': 'yes',
'ProtectKernelTunables': 'yes',
'ProtectKernelModules': 'yes',
'ProtectKernelLogs': 'yes',
'ProtectControlGroups': 'yes',
'RestrictNamespaces': 'yes',
'MemoryDenyWriteExecute': 'yes',
'RestrictRealtime': 'yes',
'CapabilityBoundingSet': '',
}