/etc/initramfs-tools/conf-hooks.d/dropbear is in dropbear-initramfs 2016.72-1.
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 15 16 | #
# DROPBEAR: [ y | n ]
#
# Use dropbear if available. If not specified, dropbear will be used - if
# possible - in case of cryptroot.
#
#DROPBEAR=y
#
# UMASK: [ 4-DIGIT OCTAL UMASK ]
#
# umask to use when creating an initramfs
#
UMASK=0077
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