/etc/pure-ftpd/pureftpd-dir-aliases is in pure-ftpd-common 1.0.46-1build1.
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 | # Configuration file for directory aliases
#
# To define alias/directory pairs, use alternating lines of alias
# and directory (optional blank lines are allowed) like that:
#
# pictures
# /usr/misc/pictures
#
# sources
# /usr/src
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