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--threshold option added to work with security verb and with the --offline option so that
users can determine what qualifies as a security threat. The threshold set by the user is
compared with the overall exposure level assigned to a unit file and if the exposure is
higher than the threshold, 'security' will return a non-zero exit status. The default value
of the --threshold option is 100.
Example Run:
1. testcase.service is a unit file created for testing the --threshold option
maanya-goenka@debian:~/systemd (systemd-security)$ cat<<EOF>testcase.service
> [Service]
> ExecStart = echo hello
> EOF
For the purposes of this demo, the security table outputted below has been cut to show only the first two security settings.
maanya-goenka@debian:~/systemd (systemd-security)$ sudo build/systemd-analyze security --offline=true testcase.service
/usr/lib/systemd/system/plymouth-start.service:15: Unit configured to use KillMode=none. This is unsafe, as it disables systemd's
process lifecycle management for the service. Please update your service to use a safer KillMode=, such as 'mixed' or 'control-group'.
Support for KillMode=none is deprecated and will eventually be removed.
/usr/lib/systemd/system/gdm.service:30: Standard output type syslog is obsolete, automatically updating to journal. Please update your
unit file, and consider removing the setting altogether.
/usr/lib/systemd/system/dbus.socket:5: ListenStream= references a path below legacy directory /var/run/, updating
/var/run/dbus/system_bus_socket → /run/dbus/system_bus_socket; please update the unit file accordingly.
NAME DESCRIPTION EXPOSURE
✗ PrivateNetwork= Service has access to the host's network 0.5
✗ User=/DynamicUser= Service runs as root user 0.4
→ Overall exposure level for testcase.service: 9.6 UNSAFE 😨
maanya-goenka@debian:~/systemd (systemd-security)$ echo $? 0
2. Next, we use the same testcase.service file but add an additional --threshold=60 parameter. We would expect 'security' to exit
with a non-zero status because the overall exposure level (= 96) is higher than the set threshold (= 60).
maanya-goenka@debian:~/systemd (systemd-security)$ sudo build/systemd-analyze security --offline=true --threshold=60 testcase.service
/usr/lib/systemd/system/plymouth-start.service:15: Unit configured to use KillMode=none. This is unsafe, as it disables systemd's
process lifecycle management for the service. Please update your service to use a safer KillMode=, such as 'mixed' or 'control-group'.
Support for KillMode=none is deprecated and will eventually be removed.
/usr/lib/systemd/system/gdm.service:30: Standard output type syslog is obsolete, automatically updating to journal. Please update your
unit file, and consider removing the setting altogether.
/usr/lib/systemd/system/dbus.socket:5: ListenStream= references a path below legacy directory /var/run/, updating
/var/run/dbus/system_bus_socket → /run/dbus/system_bus_socket; please update the unit file accordingly.
NAME DESCRIPTION EXPOSURE
✗ PrivateNetwork= Service has access to the host's network 0.5
✗ User=/DynamicUser= Service runs as root user 0.4
→ Overall exposure level for testcase.service: 9.6 UNSAFE 😨
maanya-goenka@debian:~/systemd (systemd-security)$ echo $? 1
dfbda8799c