2f1c3b8afb
Lock down the software TPM service: restrict the runtime directory (which holds the AES key sealing swtpm's state) to 0700, and apply the usual sandboxing (NoNewPrivileges, MemoryDenyWriteExecute, ProtectSystem-adjacent Protect*/Restrict* knobs, PrivateNetwork, PrivateTmp, a @system-service syscall filter, etc.). A few common knobs can't be used here: the service must keep CAP_SYS_ADMIN (needed for the ioctl that creates the vtpm proxy device on /dev/vtpmx), and it needs runtime access to the ESP and its backing block device at a path only known at runtime, which rules out PrivateDevices=, DevicePolicy=, ProtectSystem= and User=/DynamicUser=. Signed-off-by: Paul Meyer <katexochen0@gmail.com>
System and Service Manager
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