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units: switch from system call blacklist to whitelist

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This is generally the safer approach, and is what container managers
(including nspawn) do, hence let's move to this too for our own
services. This is particularly useful as this this means the new
@system-service system call filter group will get serious real-life
testing quickly.

This also switches from firing SIGSYS on unexpected syscalls to
returning EPERM. This would have probably been a better default anyway,
but it's hard to change that these days. When whitelisting system calls
SIGSYS is highly problematic as system calls that are newly introduced
to Linux become minefields for services otherwise.

Note that this enables a system call filter for udev for the first time,
and will block @clock, @mount and @swap from it. Some downstream
distributions might want to revert this locally if they want to permit
unsafe operations on udev rules, but in general this shiuld be mostly
safe, as we already set MountFlags=shared for udevd, hence at least
@mount won't change anything.
This commit is contained in:
Lennart Poettering 2018-04-19 11:04:17 +02:00
parent e05ee49b14
commit ee8f26180d
12 changed files with 24 additions and 11 deletions
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3
units/systemd-coredump@.service.in
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@ -33,7 +33,8 @@ MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictNamespaces=yes
RestrictAddressFamilies=AF_UNIX
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
IPAddressDeny=any

3
units/systemd-hostnamed.service.in
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@ -29,7 +29,8 @@ MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictNamespaces=yes
RestrictAddressFamilies=AF_UNIX
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service sethostname
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
IPAddressDeny=any

3
units/systemd-importd.service.in
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@ -23,6 +23,7 @@ MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictNamespaces=net
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service @mount
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes

3
units/systemd-journald.service.in
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@ -29,7 +29,8 @@ MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictNamespaces=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
IPAddressDeny=any

3
units/systemd-localed.service.in
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@ -29,7 +29,8 @@ MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictNamespaces=yes
RestrictAddressFamilies=AF_UNIX
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
IPAddressDeny=any

3
units/systemd-logind.service.in
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@ -30,7 +30,8 @@ MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictNamespaces=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
IPAddressDeny=any

3
units/systemd-machined.service.in
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@ -23,7 +23,8 @@ CapabilityBoundingSet=CAP_KILL CAP_SYS_PTRACE CAP_SYS_ADMIN CAP_SETGID CAP_SYS_C
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service @mount
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
IPAddressDeny=any

3
units/systemd-networkd.service.in
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@ -35,7 +35,8 @@ MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictNamespaces=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6 AF_PACKET
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
RuntimeDirectory=systemd/netif

3
units/systemd-resolved.service.in
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@ -38,7 +38,8 @@ MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictNamespaces=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
RuntimeDirectory=systemd/resolve

3
units/systemd-timedated.service.in
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@ -27,7 +27,8 @@ MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictNamespaces=yes
RestrictAddressFamilies=AF_UNIX
SystemCallFilter=~@cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service @clock
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
IPAddressDeny=any

3
units/systemd-timesyncd.service.in
View File

@ -38,7 +38,8 @@ RestrictRealtime=yes
RestrictNamespaces=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
RuntimeDirectory=systemd/timesync
SystemCallFilter=~@cpu-emulation @debug @keyring @module @mount @obsolete @raw-io @reboot @swap
SystemCallFilter=@system-service @clock
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
StateDirectory=systemd/timesync

2
units/systemd-udevd.service.in
View File

@ -29,6 +29,8 @@ PrivateMounts=yes
MemoryDenyWriteExecute=yes
RestrictRealtime=yes
RestrictAddressFamilies=AF_UNIX AF_NETLINK AF_INET AF_INET6
SystemCallFilter=@system-service @module @raw-io
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
LockPersonality=yes
IPAddressDeny=any