[PVE-User] loolwsd and unprivileged LXC Containers...

[Marco Gaiarin]

[ Also here:
	https://github.com/CollaboraOnline/richdocumentscode/issues/72
]

I've installed Collabora Online on a debian buster LXC unprivilegend container mostly following NextCloud info in https://nextcloud.com/collaboraonline/; loolwsd start as expected, Nextclud connect to the instance but when i try to open a document i got:

Sep 25 15:27:42 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: mount failed remount [/opt/lool/child-roots/ridzJ5vsTwBcah6P] readonly: Permission denied.
Sep 25 15:27:42 vnclpb1 loolwsd[14250]: kit-15540-14256 2020-09-25 13:27:42.797451 [ kit_spare_002 ] ERR  Failed to mount [/opt/lool/systemplate] -> [/opt/lool/child-roots/ridzJ5vsTwBcah6P/] readonly.| common/JailUtil.cpp:59
Sep 25 15:27:42 vnclpb1 loolwsd[14250]: kit-15540-14256 2020-09-25 13:27:42.797520 [ kit_spare_002 ] WRN  Failed to mount [/opt/lool/systemplate] -> [/opt/lool/child-roots/ridzJ5vsTwBcah6P/], will link/copy contents.| kit/Kit.cpp:2149
Sep 25 15:27:42 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: forced unmount of [/opt/lool/child-roots/ridzJ5vsTwBcah6P/tmp] failed: Permission denied.
Sep 25 15:27:42 vnclpb1 loolwsd[14250]: kit-15540-14256 2020-09-25 13:27:42.827965 [ kit_spare_002 ] ERR  Failed to unmount [/opt/lool/child-roots/ridzJ5vsTwBcah6P/tmp].| common/JailUtil.cpp:70
Sep 25 15:27:42 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: forced unmount of [/opt/lool/child-roots/ridzJ5vsTwBcah6P/lo] failed: Permission denied.
Sep 25 15:27:42 vnclpb1 loolwsd[14250]: kit-15540-14256 2020-09-25 13:27:42.847363 [ kit_spare_002 ] ERR  Failed to unmount [/opt/lool/child-roots/ridzJ5vsTwBcah6P/lo].| common/JailUtil.cpp:70
Sep 25 15:27:42 vnclpb1 systemd[15367]: opt-lool-child\x2droots-ridzJ5vsTwBcah6P.mount: Succeeded.
Sep 25 15:27:42 vnclpb1 systemd[1]: opt-lool-child\x2droots-ridzJ5vsTwBcah6P.mount: Succeeded.
Sep 25 15:27:42 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: forced unmount of [/opt/lool/child-roots/ridzJ5vsTwBcah6P] failed: Permission denied.
Sep 25 15:27:42 vnclpb1 loolwsd[14250]: kit-15540-14256 2020-09-25 13:27:42.880200 [ kit_spare_002 ] ERR  Failed to unmount [/opt/lool/child-roots/ridzJ5vsTwBcah6P/].| common/JailUtil.cpp:70
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15540-14256 2020-09-25 13:27:43.283542 [ kit_spare_002 ] ERR  mknod(/opt/lool/child-roots/ridzJ5vsTwBcah6P//tmp/dev/random) failed. Mount must not use nodev flag. (EPERM: Operation not permitted)| common/JailUtil.cpp:228
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15540-14256 2020-09-25 13:27:43.283625 [ kit_spare_002 ] ERR  mknod(/opt/lool/child-roots/ridzJ5vsTwBcah6P//tmp/dev/urandom) failed. Mount must not use nodev flag. (EPERM: Operation not permitted)| common/JailUtil.cpp:240
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: mount failed remount [/opt/lool/child-roots/Il1oS2dgPsdODGa9] readonly: Permission denied.
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15573-14256 2020-09-25 13:27:43.557557 [ kit_spare_003 ] ERR  Failed to mount [/opt/lool/systemplate] -> [/opt/lool/child-roots/Il1oS2dgPsdODGa9/] readonly.| common/JailUtil.cpp:59
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15573-14256 2020-09-25 13:27:43.557623 [ kit_spare_003 ] WRN  Failed to mount [/opt/lool/systemplate] -> [/opt/lool/child-roots/Il1oS2dgPsdODGa9/], will link/copy contents.| kit/Kit.cpp:2149
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: mount failed remount [/opt/lool/child-roots/XuuVkTQOzdi6lfl4] readonly: Permission denied.
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15574-14256 2020-09-25 13:27:43.564909 [ kit_spare_004 ] ERR  Failed to mount [/opt/lool/systemplate] -> [/opt/lool/child-roots/XuuVkTQOzdi6lfl4/] readonly.| common/JailUtil.cpp:59
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15574-14256 2020-09-25 13:27:43.564977 [ kit_spare_004 ] WRN  Failed to mount [/opt/lool/systemplate] -> [/opt/lool/child-roots/XuuVkTQOzdi6lfl4/], will link/copy contents.| kit/Kit.cpp:2149
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: forced unmount of [/opt/lool/child-roots/Il1oS2dgPsdODGa9/tmp] failed: Permission denied.
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15573-14256 2020-09-25 13:27:43.600571 [ kit_spare_003 ] ERR  Failed to unmount [/opt/lool/child-roots/Il1oS2dgPsdODGa9/tmp].| common/JailUtil.cpp:70
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: forced unmount of [/opt/lool/child-roots/XuuVkTQOzdi6lfl4/tmp] failed: Permission denied.
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15574-14256 2020-09-25 13:27:43.603914 [ kit_spare_004 ] ERR  Failed to unmount [/opt/lool/child-roots/XuuVkTQOzdi6lfl4/tmp].| common/JailUtil.cpp:70
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: forced unmount of [/opt/lool/child-roots/Il1oS2dgPsdODGa9/lo] failed: Permission denied.
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15573-14256 2020-09-25 13:27:43.627610 [ kit_spare_003 ] ERR  Failed to unmount [/opt/lool/child-roots/Il1oS2dgPsdODGa9/lo].| common/JailUtil.cpp:70
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: forced unmount of [/opt/lool/child-roots/XuuVkTQOzdi6lfl4/lo] failed: Permission denied.
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15574-14256 2020-09-25 13:27:43.642396 [ kit_spare_004 ] ERR  Failed to unmount [/opt/lool/child-roots/XuuVkTQOzdi6lfl4/lo].| common/JailUtil.cpp:70
Sep 25 15:27:43 vnclpb1 systemd[15367]: opt-lool-child\x2droots-Il1oS2dgPsdODGa9.mount: Succeeded.
Sep 25 15:27:43 vnclpb1 systemd[1]: opt-lool-child\x2droots-Il1oS2dgPsdODGa9.mount: Succeeded.
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: forced unmount of [/opt/lool/child-roots/Il1oS2dgPsdODGa9] failed: Permission denied.
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15573-14256 2020-09-25 13:27:43.661583 [ kit_spare_003 ] ERR  Failed to unmount [/opt/lool/child-roots/Il1oS2dgPsdODGa9/].| common/JailUtil.cpp:70
Sep 25 15:27:43 vnclpb1 systemd[15367]: opt-lool-child\x2droots-XuuVkTQOzdi6lfl4.mount: Succeeded.
Sep 25 15:27:43 vnclpb1 systemd[1]: opt-lool-child\x2droots-XuuVkTQOzdi6lfl4.mount: Succeeded.
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: /usr/bin/loolmount: forced unmount of [/opt/lool/child-roots/XuuVkTQOzdi6lfl4] failed: Permission denied.
Sep 25 15:27:43 vnclpb1 loolwsd[14250]: kit-15574-14256 2020-09-25 13:27:43.697419 [ kit_spare_004 ] ERR  Failed to unmount [/opt/lool/child-roots/XuuVkTQOzdi6lfl4/].| common/JailUtil.cpp:70

and in the host system (Proxmox VE 6):

Sep 25 15:27:42 ino kernel: [433028.908691] audit: type=1400 audit(1601040462.792:24): apparmor="DENIED" operation="mount" info="failed flags match" error=-13 profile="lxc-104_</var/lib/lxc>" name="/opt/lool/child-roots/ridzJ5vsTwBcah6P/" pid=3673 comm="loolmount" flags="ro, nosuid, nodev, remount, noatime, rbind, silent"
Sep 25 15:27:43 ino kernel: [433029.669132] audit: type=1400 audit(1601040463.552:25): apparmor="DENIED" operation="mount" info="failed flags match" error=-13 profile="lxc-104_</var/lib/lxc>" name="/opt/lool/child-roots/Il1oS2dgPsdODGa9/" pid=3813 comm="loolmount" flags="ro, nosuid, nodev, remount, noatime, rbind, silent"
Sep 25 15:27:43 ino kernel: [433029.676506] audit: type=1400 audit(1601040463.560:26): apparmor="DENIED" operation="mount" info="failed flags match" error=-13 profile="lxc-104_</var/lib/lxc>" name="/opt/lool/child-roots/XuuVkTQOzdi6lfl4/" pid=3814 comm="loolmount" flags="ro, nosuid, nodev, remount, noatime, rbind, silent"

I've tried to disable options like 'mount_jail_tree' and 'capabilities'
in loolwsd configuration with no luck.

Collabora Online is incompatible with unprivileged containers?! Or
there are some specific capability in the container that i can relax to
make it work?


Thanks.

-- 
dott. Marco Gaiarin				        GNUPG Key ID: 240A3D66
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