/etc/X11/Xsession.d/36x11-common_xhost-boinc is in boinc-client 7.6.31+dfsg-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #
# Some boinc headers needed so if some poor admin stumbles across this he knows where it came from...
#
# This file is sourced by Xsession(5), not executed.
BOINC_USER=boinc
#
# If xhost (from x11-xserver-utils) is installed, use it to give access
# to the X server to any process from the same user on the local host.
# Unlike other uses of xhost, this is safe since the kernel can check
# the actual owner of the calling process.
if type xhost >/dev/null 2>&1; then
id -u $BOINC_USER >/dev/null 2>&1 && xhost +SI:localuser:$BOINC_USER || :
fi
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