/etc/default/nss is in libc-bin 2.27-3ubuntu1.
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 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | # /etc/default/nss
# This file can theoretically contain a bunch of customization variables
# for Name Service Switch in the GNU C library. For now there are only
# four variables:
#
# NETID_AUTHORITATIVE
# If set to TRUE, the initgroups() function will accept the information
# from the netid.byname NIS map as authoritative. This can speed up the
# function significantly if the group.byname map is large. The content
# of the netid.byname map is used AS IS. The system administrator has
# to make sure it is correctly generated.
#NETID_AUTHORITATIVE=TRUE
#
# SERVICES_AUTHORITATIVE
# If set to TRUE, the getservbyname{,_r}() function will assume
# services.byservicename NIS map exists and is authoritative, particularly
# that it contains both keys with /proto and without /proto for both
# primary service names and service aliases. The system administrator
# has to make sure it is correctly generated.
#SERVICES_AUTHORITATIVE=TRUE
#
# SETENT_BATCH_READ
# If set to TRUE, various setXXent() functions will read the entire
# database at once and then hand out the requests one by one from
# memory with every getXXent() call. Otherwise each getXXent() call
# might result into a network communication with the server to get
# the next entry.
#SETENT_BATCH_READ=TRUE
#
# ADJUNCT_AS_SHADOW
# If set to TRUE, the passwd routines in the NIS NSS module will not
# use the passwd.adjunct.byname tables to fill in the password data
# in the passwd structure. This is a security problem if the NIS
# server cannot be trusted to send the passwd.adjuct table only to
# privileged clients. Instead the passwd.adjunct.byname table is
# used to synthesize the shadow.byname table if it does not exist.
ADJUNCT_AS_SHADOW=TRUE
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