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nspawn: set DevicesPolicy closed and clean up duplicated devices

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This commit is contained in:
Alessandro Puccetti 2016-07-22 11:58:03 +02:00
parent b3d1d51603
commit 54cd6556b3
2 changed files with 4 additions and 24 deletions
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17
src/nspawn/nspawn-register.c
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@ -104,7 +104,7 @@ int register_machine(
return bus_log_create_error(r);
}
r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict");
r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "closed");
if (r < 0)
return bus_log_create_error(r);
@ -112,31 +112,20 @@ int register_machine(
* systemd-nspawn@.service, to keep the device
* policies in sync regardless if we are run with or
* without the --keep-unit switch. */
r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 11,
r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 2,
/* Allow the container to
* access and create the API
* device nodes, so that
* PrivateDevices= in the
* container can work
* fine */
"/dev/null", "rwm",
"/dev/zero", "rwm",
"/dev/full", "rwm",
"/dev/random", "rwm",
"/dev/urandom", "rwm",
"/dev/tty", "rwm",
"/dev/net/tun", "rwm",
/* Allow the container
* access to ptys. However,
* do not permit the
* container to ever create
* these device nodes. */
"/dev/pts/ptmx", "rw",
"char-pts", "rw",
/* Allow /run/systemd/inaccessible/{chr,blk}
* devices inside the container */
"/run/systemd/inaccessible/chr", "rwm",
"/run/systemd/inaccessible/blk", "rwm");
"char-pts", "rw");
if (r < 0)
return bus_log_create_error(r);

11
units/systemd-nspawn@.service.in
View file

@ -25,18 +25,9 @@ TasksMax=16384
# Enforce a strict device policy, similar to the one nspawn configures
# when it allocates its own scope unit. Make sure to keep these
# policies in sync if you change them!
DevicePolicy=strict
DeviceAllow=/dev/null rwm
DeviceAllow=/dev/zero rwm
DeviceAllow=/dev/full rwm
DeviceAllow=/dev/random rwm
DeviceAllow=/dev/urandom rwm
DeviceAllow=/dev/tty rwm
DevicePolicy=closed
DeviceAllow=/dev/net/tun rwm
DeviceAllow=/dev/pts/ptmx rw
DeviceAllow=char-pts rw
DeviceAllow=/run/systemd/inaccessible/chr rwm
DeviceAllow=/run/systemd/inaccessible/blk rwm
# nspawn itself needs access to /dev/loop-control and /dev/loop, to
# implement the --image= option. Add these here, too.