/usr/sbin/nssldap-update-ignoreusers is in libnss-ldap 264-2.2ubuntu2.
This file is owned by root:root, with mode 0o755.
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 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | #!/bin/sh -e
#
# nssldap-update-ignoreusers
# Copyright (C) 2008 Canonical Ltd.
# Author: Dustin Kirkland <kirkland@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3,
# as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Location of LDAP's nss_* configuration
CONF=/etc/ldap.conf
if [ ! -s $CONF ]; then
exit 0
fi
# Location of logged $CONF changes
LOGDIR="/var/lib/libnss-ldap"
# Load threshold for ignoring uid's from $CONF
MIN=`grep "^nss_initgroups_minimum_uid " $CONF | tail -n 1 | awk '{print $2}'`
# If unspecified, set to 1000 (ignore local system id's) to prevent boot hang
if [ -z $MIN ]; then
MIN=1000
fi
# Load existing list of ignored users from ldap.conf
LOADED_USERS=`grep "^nss_initgroups_ignoreusers " $CONF | tail -n 1 | awk '{print $2}'`
# Build list of users to ignore based on specified minimum UID
users=`cat /etc/passwd | awk -F":" '{if ($3 <'$MIN') print $1 ","}' | xargs -i echo -n {}`
# Merge the two lists, remove whitespace, sort alphabetically, prune duplicates
users=`echo "$LOADED_USERS,$users" | sed "s/ //g" | sed "s/,/\n/g" | sort | uniq | xargs -i echo -n {},`
# Removing any leading or trailing commas
users=`echo "$users" | sed "s/^,//" | sed "s/,$//"`
confline="nss_initgroups_ignoreusers $users"
# Build new conf file
tmpfile=`mktemp`
cat $CONF > $tmpfile
if grep "^nss_initgroups_ignoreusers " $CONF >/dev/null; then
sed -i "s/^nss_initgroups_ignoreusers .*$/$confline/g" $CONF
else
echo $confline >> $CONF
fi
# If changes have occured, log the difference
if ! diff -up $tmpfile $CONF >/dev/null; then
timestamp=`date +%Y%m%d%H%M%S`
mkdir -p $LOGDIR 2>/dev/null || true
diff -up $tmpfile $CONF > $LOGDIR/ldap.conf.$timestamp.diff || true
logger -p syslog.info -t libnss-ldap "Modified $CONF, see changes in $LOGDIR/ldap.conf.$timestamp.diff"
fi
rm -f $tmpfile
exit 0
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