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feat(console): the console daemons' systemd units run sandboxed

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webvirt-novncd and webvirt-socketiod get read-only system directories, no
access to /home and /root, no new privileges, no kernel tunables, modules
or cgroups, and only Unix, IPv4 and IPv6 sockets; socketiod also a private
/tmp. novncd keeps the shared /tmp, where a VM's VNC Unix socket may be.
They keep what they need: a pty and its console worker, TCP and Unix
sockets, ssh with its configuration, writes under /srv/webvirtcloud and
the service user's ~/.ssh. The units installed by the update steps bring
this.
This commit is contained in:
catborise 2026-10-26 21:29:39 +03:00
parent 554e3a7995
commit 69ddbbdc94
3 changed files with 25 additions and 0 deletions
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12
conf/systemd/webvirt-novncd.service
View file

@ -11,6 +11,18 @@ EnvironmentFile=-/etc/default/webvirtcloud
ExecStart=/srv/webvirtcloud/venv/bin/python3 /srv/webvirtcloud/console/novncd
Restart=on-failure
RestartSec=10
# Sandbox: what the console daemons need (TCP and Unix sockets, ssh,
# writes under /srv and the user's ~/.ssh) and no more. No private /tmp:
# a VM's VNC Unix socket may be there.
NoNewPrivileges=yes
ProtectSystem=full
ProtectHome=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectControlGroups=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
RestrictSUIDSGID=yes
LockPersonality=yes
[Install]
WantedBy=multi-user.target

12
conf/systemd/webvirt-socketiod.service
View file

@ -13,6 +13,18 @@ ExecStart=/srv/webvirtcloud/venv/bin/python3 /srv/webvirtcloud/console/socketiod
KillMode=mixed
Restart=on-failure
RestartSec=10
# Sandbox: what the console daemons need (a pty and its worker, TCP and
# Unix sockets, ssh, writes under /srv and the user's ~/.ssh) and no more
NoNewPrivileges=yes
PrivateTmp=yes
ProtectSystem=full
ProtectHome=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectControlGroups=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
RestrictSUIDSGID=yes
LockPersonality=yes
[Install]
WantedBy=multi-user.target