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units: further lock down our long-running services

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Let's make this an excercise in dogfooding: let's turn on more security
features for all our long-running services.

Specifically:

- Turn on RestrictRealtime=yes for all of them

- Turn on ProtectKernelTunables=yes and ProtectControlGroups=yes for most of
  them

- Turn on RestrictAddressFamilies= for all of them, but different sets of
  address families for each

Also, always order settings in the unit files, that the various sandboxing
features are close together.

Add a couple of missing, older settings for a numbre of unit files.

Note that this change turns off AF_INET/AF_INET6 from udevd, thus effectively
turning of networking from udev rule commands. Since this might break stuff
(that is already broken I'd argue) this is documented in NEWS.
This commit is contained in:
Lennart Poettering 2016-08-26 13:23:27 +02:00 committed by Djalal Harouni
parent f6eb19a474
commit 0c28d51ac8
14 changed files with 71 additions and 19 deletions
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6
units/systemd-hostnamed.service.in
View File

@ -13,12 +13,16 @@ Documentation=http://www.freedesktop.org/wiki/Software/systemd/hostnamed
[Service]
ExecStart=@rootlibexecdir@/systemd-hostnamed
BusName=org.freedesktop.hostname1
CapabilityBoundingSet=CAP_SYS_ADMIN
WatchdogSec=3min
CapabilityBoundingSet=CAP_SYS_ADMIN
PrivateTmp=yes
PrivateDevices=yes
PrivateNetwork=yes
ProtectSystem=yes
ProtectHome=yes
ProtectControlGroups=yes
ProtectKernelTunables=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io

6
units/systemd-importd.service.in
View File

@ -13,9 +13,11 @@ Documentation=http://www.freedesktop.org/wiki/Software/systemd/importd
[Service]
ExecStart=@rootlibexecdir@/systemd-importd
BusName=org.freedesktop.import1
CapabilityBoundingSet=CAP_CHOWN CAP_FOWNER CAP_FSETID CAP_MKNOD CAP_SETFCAP CAP_SYS_ADMIN CAP_SETPCAP CAP_DAC_OVERRIDE
NoNewPrivileges=yes
WatchdogSec=3min
KillMode=mixed
CapabilityBoundingSet=CAP_CHOWN CAP_FOWNER CAP_FSETID CAP_MKNOD CAP_SETFCAP CAP_SYS_ADMIN CAP_SETPCAP CAP_DAC_OVERRIDE
NoNewPrivileges=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @obsolete @raw-io

5
units/systemd-journal-gatewayd.service.in
View File

@ -20,6 +20,11 @@ PrivateDevices=yes
PrivateNetwork=yes
ProtectSystem=full
ProtectHome=yes
ProtectControlGroups=yes
ProtectKernelTunables=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
# If there are many split upjournal files we need a lot of fds to
# access them all and combine

13
units/systemd-journal-remote.service.in
View File

@ -11,15 +11,20 @@ Documentation=man:systemd-journal-remote(8) man:journal-remote.conf(5)
Requires=systemd-journal-remote.socket
[Service]
ExecStart=@rootlibexecdir@/systemd-journal-remote \
--listen-https=-3 \
--output=/var/log/journal/remote/
ExecStart=@rootlibexecdir@/systemd-journal-remote --listen-https=-3 --output=/var/log/journal/remote/
User=systemd-journal-remote
Group=systemd-journal-remote
WatchdogSec=3min
PrivateTmp=yes
PrivateDevices=yes
PrivateNetwork=yes
WatchdogSec=3min
ProtectSystem=full
ProtectHome=yes
ProtectControlGroups=yes
ProtectKernelTunables=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
[Install]
Also=systemd-journal-remote.socket

12
units/systemd-journal-upload.service.in
View File

@ -11,13 +11,19 @@ Documentation=man:systemd-journal-upload(8)
After=network.target
[Service]
ExecStart=@rootlibexecdir@/systemd-journal-upload \
--save-state
ExecStart=@rootlibexecdir@/systemd-journal-upload --save-state
User=systemd-journal-upload
SupplementaryGroups=systemd-journal
WatchdogSec=3min
PrivateTmp=yes
PrivateDevices=yes
WatchdogSec=3min
ProtectSystem=full
ProtectHome=yes
ProtectControlGroups=yes
ProtectKernelTunables=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
# If there are many split up journal files we need a lot of fds to
# access them all and combine

4
units/systemd-journald.service.in
View File

@ -21,10 +21,12 @@ Restart=always
RestartSec=0
NotifyAccess=all
StandardOutput=null
CapabilityBoundingSet=CAP_SYS_ADMIN CAP_DAC_OVERRIDE CAP_SYS_PTRACE CAP_SYSLOG CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_CHOWN CAP_DAC_READ_SEARCH CAP_FOWNER CAP_SETUID CAP_SETGID CAP_MAC_OVERRIDE
WatchdogSec=3min
FileDescriptorStoreMax=1024
CapabilityBoundingSet=CAP_SYS_ADMIN CAP_DAC_OVERRIDE CAP_SYS_PTRACE CAP_SYSLOG CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_CHOWN CAP_DAC_READ_SEARCH CAP_FOWNER CAP_SETUID CAP_SETGID CAP_MAC_OVERRIDE
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io
# Increase the default a bit in order to allow many simultaneous

6
units/systemd-localed.service.in
View File

@ -13,12 +13,16 @@ Documentation=http://www.freedesktop.org/wiki/Software/systemd/localed
[Service]
ExecStart=@rootlibexecdir@/systemd-localed
BusName=org.freedesktop.locale1
CapabilityBoundingSet=
WatchdogSec=3min
CapabilityBoundingSet=
PrivateTmp=yes
PrivateDevices=yes
PrivateNetwork=yes
ProtectSystem=yes
ProtectHome=yes
ProtectControlGroups=yes
ProtectKernelTunables=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io

4
units/systemd-logind.service.in
View File

@ -23,9 +23,11 @@ ExecStart=@rootlibexecdir@/systemd-logind
Restart=always
RestartSec=0
BusName=org.freedesktop.login1
CapabilityBoundingSet=CAP_SYS_ADMIN CAP_MAC_ADMIN CAP_AUDIT_CONTROL CAP_CHOWN CAP_KILL CAP_DAC_READ_SEARCH CAP_DAC_OVERRIDE CAP_FOWNER CAP_SYS_TTY_CONFIG
WatchdogSec=3min
CapabilityBoundingSet=CAP_SYS_ADMIN CAP_MAC_ADMIN CAP_AUDIT_CONTROL CAP_CHOWN CAP_KILL CAP_DAC_READ_SEARCH CAP_DAC_OVERRIDE CAP_FOWNER CAP_SYS_TTY_CONFIG
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @obsolete @raw-io
# Increase the default a bit in order to allow many simultaneous

4
units/systemd-machined.service.in
View File

@ -15,9 +15,11 @@ After=machine.slice
[Service]
ExecStart=@rootlibexecdir@/systemd-machined
BusName=org.freedesktop.machine1
CapabilityBoundingSet=CAP_KILL CAP_SYS_PTRACE CAP_SYS_ADMIN CAP_SETGID CAP_SYS_CHROOT CAP_DAC_READ_SEARCH CAP_DAC_OVERRIDE CAP_CHOWN CAP_FOWNER CAP_FSETID CAP_MKNOD
WatchdogSec=3min
CapabilityBoundingSet=CAP_KILL CAP_SYS_PTRACE CAP_SYS_ADMIN CAP_SETGID CAP_SYS_CHROOT CAP_DAC_READ_SEARCH CAP_DAC_OVERRIDE CAP_CHOWN CAP_FOWNER CAP_FSETID CAP_MKNOD
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @obsolete @raw-io
# Note that machined cannot be placed in a mount namespace, since it

5
units/systemd-networkd.service.m4.in
View File

@ -27,11 +27,14 @@ Type=notify
Restart=on-failure
RestartSec=0
ExecStart=@rootlibexecdir@/systemd-networkd
WatchdogSec=3min
CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SETUID CAP_SETGID CAP_SETPCAP CAP_CHOWN CAP_DAC_OVERRIDE CAP_FOWNER
ProtectSystem=full
ProtectHome=yes
WatchdogSec=3min
ProtectControlGroups=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6 AF_PACKET
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io
[Install]

8
units/systemd-resolved.service.m4.in
View File

@ -23,11 +23,17 @@ Type=notify
Restart=always
RestartSec=0
ExecStart=@rootlibexecdir@/systemd-resolved
WatchdogSec=3min
CapabilityBoundingSet=CAP_SETUID CAP_SETGID CAP_SETPCAP CAP_CHOWN CAP_DAC_OVERRIDE CAP_FOWNER CAP_NET_RAW CAP_NET_BIND_SERVICE
PrivateTmp=yes
PrivateDevices=yes
ProtectSystem=full
ProtectHome=yes
WatchdogSec=3min
ProtectControlGroups=yes
ProtectKernelTunables=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io
[Install]

6
units/systemd-timedated.service.in
View File

@ -13,10 +13,14 @@ Documentation=http://www.freedesktop.org/wiki/Software/systemd/timedated
[Service]
ExecStart=@rootlibexecdir@/systemd-timedated
BusName=org.freedesktop.timedate1
CapabilityBoundingSet=CAP_SYS_TIME
WatchdogSec=3min
CapabilityBoundingSet=CAP_SYS_TIME
PrivateTmp=yes
ProtectSystem=yes
ProtectHome=yes
ProtectControlGroups=yes
ProtectKernelTunables=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX
SystemCallFilter=~@cpu-emulation @debug @keyring @module @mount @obsolete @raw-io

6
units/systemd-timesyncd.service.in
View File

@ -22,13 +22,17 @@ Type=notify
Restart=always
RestartSec=0
ExecStart=@rootlibexecdir@/systemd-timesyncd
WatchdogSec=3min
CapabilityBoundingSet=CAP_SYS_TIME CAP_SETUID CAP_SETGID CAP_SETPCAP CAP_CHOWN CAP_DAC_OVERRIDE CAP_FOWNER
PrivateTmp=yes
PrivateDevices=yes
ProtectSystem=full
ProtectHome=yes
WatchdogSec=3min
ProtectControlGroups=yes
ProtectKernelTunables=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
SystemCallFilter=~@cpu-emulation @debug @keyring @module @mount @obsolete @raw-io
[Install]

5
units/systemd-udevd.service.in
View File

@ -21,7 +21,10 @@ Sockets=systemd-udevd-control.socket systemd-udevd-kernel.socket
Restart=always
RestartSec=0
ExecStart=@rootlibexecdir@/systemd-udevd
MountFlags=slave
KillMode=mixed
WatchdogSec=3min
TasksMax=infinity
MountFlags=slave
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK