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Chapter 93. Migrating from NIS to Identity Management

A Network Information Service (NIS) server can contain information about users, groups, hosts, netgroups and automount maps. As a system administrator you can migrate these entry types, authentication, and authorization from NIS server to an Identity Management (IdM) server so that all user management operations are performed on the IdM server. Migrating from NIS to IdM will also allow you access to more secure protocols such as Kerberos.

93.1. Enabling NIS in IdM

To allow communication between NIS and Identity Management (IdM) server, you must enable NIS compatibility options on IdM server.

Prerequisites

  • You have root access on IdM server.

Procedure

  1. Enable the NIS listener and compatibility plug-ins on IdM server:

    [root@ipaserver ~]# ipa-nis-manage enable
    [root@ipaserver ~]# ipa-compat-manage enable
  2. Optional: For a more strict firewall configuration, set a fixed port.

    For example, to set the port to unused port 514:

    [root@ipaserver ~]# ldapmodify -x -D 'cn=directory manager' -W
    dn: cn=NIS Server,cn=plugins,cn=config
    changetype: modify
    add: nsslapd-pluginarg0
    nsslapd-pluginarg0: 514
    Warning

    To avoid conflict with other services do not use any port number above 1024.

  3. Enable and start the port mapper service:

    [root@ipaserver ~]# systemctl enable rpcbind.service
    [root@ipaserver ~]# systemctl start rpcbind.service
  4. Restart Directory Server:

    [root@ipaserver ~]# systemctl restart dirsrv.target

93.2. Migrating user entries from NIS to IdM

The NIS passwd map contains information about users, such as names, UIDs, primary group, GECOS, shell, and home directory. Use this data to migrate NIS user accounts to Identity Management (IdM):

Prerequisites

Procedure

  1. Install the yp-tools package:

    [root@nis-server ~]# yum install yp-tools -y
  2. On the NIS server create the /root/nis-users.sh script with the following content:

    #!/bin/sh
    # $1 is the NIS domain, $2 is the NIS master server
    ypcat -d $1 -h $2 passwd > /dev/shm/nis-map.passwd 2>&1
    
    IFS=$'\n'
    for line in $(cat /dev/shm/nis-map.passwd) ; do
    	IFS=' '
    	username=$(echo $line | cut -f1 -d:)
    	# Not collecting encrypted password because we need cleartext password
    	# to create kerberos key
    	uid=$(echo $line | cut -f3 -d:)
    	gid=$(echo $line | cut -f4 -d:)
    	gecos=$(echo $line | cut -f5 -d:)
    	homedir=$(echo $line | cut -f6 -d:)
    	shell=$(echo $line | cut -f7 -d:)
    
    	# Now create this entry
    	echo passw0rd1 | ipa user-add $username --first=NIS --last=USER \
    	     --password --gidnumber=$gid --uid=$uid --gecos='$gecos' --homedir=$homedir \
    	     --shell=$shell
    	ipa user-show $username
    done
  3. Authenticate as the IdM admin user:

    [root@nis-server ~]# kinit admin
  4. Run the script. For example:

    [root@nis-server ~]# sh /root/nis-users.sh nisdomain nis-server.example.com
    Important

    This script uses hard-coded values for first name, last name, and sets the password to passw0rd1. The user must change the temporary password at the next login.

93.3. Migrating user group from NIS to IdM

The NIS group map contains information about groups, such as group names, GIDs, or group members. Use this data to migrate NIS groups to Identity Management (IdM):

Prerequisites

Procedure

  1. Install the yp-tools package:

    [root@nis-server ~]# yum install yp-tools -y
  2. Create the /root/nis-groups.sh script with the following content on the NIS server:

    #!/bin/sh
    # $1 is the NIS domain, $2 is the NIS master server
    ypcat -d $1 -h $2 group > /dev/shm/nis-map.group 2>&1
    
    IFS=$'\n'
    for line in $(cat /dev/shm/nis-map.group); do
    	IFS=' '
    	groupname=$(echo $line | cut -f1 -d:)
    	# Not collecting encrypted password because we need cleartext password
    	# to create kerberos key
    	gid=$(echo $line | cut -f3 -d:)
    	members=$(echo $line | cut -f4 -d:)
    
    	# Now create this entry
    	ipa group-add $groupname --desc=NIS_GROUP_$groupname --gid=$gid
    	if [ -n "$members" ]; then
    		ipa group-add-member $groupname --users={$members}
    	fi
    	ipa group-show $groupname
    done
  3. Authenticate as the IdM admin user:

    [root@nis-server ~]# kinit admin
  4. Run the script. For example:

    [root@nis-server ~]# sh /root/nis-groups.sh nisdomain nis-server.example.com

93.4. Migrating host entries from NIS to IdM

The NIS hosts map contains information about hosts, such as host names and IP addresses. Use this data to migrate NIS host entries to Identity Management (IdM):

Note

When you create a host group in IdM, a corresponding shadow NIS group is automatically created. Do not use the ipa netgroup-* commands on these shadow NIS groups. Use the ipa netgroup-* commands only to manage native netgroups created via the netgroup-add command.

Prerequisites

Procedure

  1. Install the yp-tools package:

    [root@nis-server ~]# yum install yp-tools -y
  2. Create the /root/nis-hosts.sh script with the following content on the NIS server:

    #!/bin/sh
    # $1 is the NIS domain, $2 is the NIS master server
    ypcat -d $1 -h $2 hosts | egrep -v "localhost|127.0.0.1" > /dev/shm/nis-map.hosts 2>&1
    
    IFS=$'\n'
    for line in $(cat /dev/shm/nis-map.hosts); do
    	IFS=' '
    	ipaddress=$(echo $line | awk '{print $1}')
    	hostname=$(echo $line | awk '{print $2}')
    	master=$(ipa env xmlrpc_uri | tr -d '[:space:]' | cut -f3 -d: | cut -f3 -d/)
    	domain=$(ipa env domain | tr -d '[:space:]' | cut -f2 -d:)
    	if [ $(echo $hostname | grep "\." |wc -l) -eq 0 ] ; then
    		hostname=$(echo $hostname.$domain)
    	fi
    	zone=$(echo $hostname | cut -f2- -d.)
    	if [ $(ipa dnszone-show $zone 2>/dev/null | wc -l) -eq 0 ] ; then
    		ipa dnszone-add --name-server=$master --admin-email=root.$master
    	fi
    	ptrzone=$(echo $ipaddress | awk -F. '{print $3 "." $2 "." $1 ".in-addr.arpa."}')
    	if [ $(ipa dnszone-show $ptrzone 2>/dev/null | wc -l) -eq 0 ] ; then
    		ipa dnszone-add  $ptrzone --name-server=$master --admin-email=root.$master
    	fi
    	# Now create this entry
    	ipa host-add $hostname --ip-address=$ipaddress
    	ipa host-show $hostname
    done
  3. Authenticate as the IdM admin user:

    [root@nis-server ~]# kinit admin
  4. Run the script. For example:

    [root@nis-server ~]# sh /root/nis-hosts.sh nisdomain nis-server.example.com
    Note

    This script does not migrate special host configurations, such as aliases.

93.5. Migrating netgroup entries from NIS to IdM

The NIS netgroup map contains information about netgroups. Use this data to migrate NIS netgroups to Identity Management (IdM):

Prerequisites

Procedure

  1. Install the yp-tools package:

    [root@nis-server ~]# yum install yp-tools -y
  2. Create the /root/nis-netgroups.sh script with the following content on the NIS server:

    #!/bin/sh
    # $1 is the NIS domain, $2 is the NIS master server
    ypcat -k -d $1 -h $2 netgroup > /dev/shm/nis-map.netgroup 2>&1
    
    IFS=$'\n'
    for line in $(cat /dev/shm/nis-map.netgroup); do
    	IFS=' '
    	netgroupname=$(echo $line | awk '{print $1}')
    	triples=$(echo $line | sed "s/^$netgroupname //")
    	echo "ipa netgroup-add $netgroupname --desc=NIS_NG_$netgroupname"
    	if [ $(echo $line | grep "(," | wc -l) -gt 0 ]; then
    		echo "ipa netgroup-mod $netgroupname --hostcat=all"
    	fi
    	if [ $(echo $line | grep ",," | wc -l) -gt 0 ]; then
    		echo "ipa netgroup-mod $netgroupname --usercat=all"
    	fi
    
    	for triple in $triples; do
    		triple=$(echo $triple | sed -e 's/-//g' -e 's/(//' -e 's/)//')
    		if [ $(echo $triple | grep ",.*," | wc -l) -gt 0 ]; then
    			hostname=$(echo $triple | cut -f1 -d,)
    			username=$(echo $triple | cut -f2 -d,)
    			domain=$(echo $triple | cut -f3 -d,)
    			hosts=""; users=""; doms="";
    			[ -n "$hostname" ] && hosts="--hosts=$hostname"
    			[ -n "$username" ] && users="--users=$username"
    			[ -n "$domain"   ] && doms="--nisdomain=$domain"
    			echo "ipa netgroup-add-member $hosts $users $doms"
    		else
    			netgroup=$triple
    			echo "ipa netgroup-add $netgroup --desc=NIS_NG_$netgroup"
    		fi
    	done
    done
  3. Authenticate as the IdM admin user:

    [root@nis-server ~]# kinit admin
  4. Run the script. For example:

    [root@nis-server ~]# sh /root/nis-netgroups.sh nisdomain nis-server.example.com

93.6. Migrating automount maps from NIS to IdM

Automount maps are a series of nested and interrelated entries that define the location (the parent entry), the associated keys, and maps. To migrate NIS automount maps to Identity Management (IdM):

Prerequisites

Procedure

  1. Install the yp-tools package:

    [root@nis-server ~]# yum install yp-tools -y
  2. Create the /root/nis-automounts.sh script with the following content on the NIS server:

    #!/bin/sh
    # $1 is for the automount entry in ipa
    
    ipa automountlocation-add $1
    
    # $2 is the NIS domain, $3 is the NIS master server, $4 is the map name
    
    ypcat -k -d $2 -h $3 $4 > /dev/shm/nis-map.$4 2>&1
    
    ipa automountmap-add $1 $4
    
    basedn=$(ipa env basedn | tr -d '[:space:]' | cut -f2 -d:)
    cat > /tmp/amap.ldif <<EOF
    dn: nis-domain=$2+nis-map=$4,cn=NIS Server,cn=plugins,cn=config
    objectClass: extensibleObject
    nis-domain: $2
    nis-map: $4
    nis-base: automountmapname=$4,cn=$1,cn=automount,$basedn
    nis-filter: (objectclass=*)
    nis-key-format: %{automountKey}
    nis-value-format: %{automountInformation}
    EOF
    ldapadd -x -h $3 -D "cn=Directory Manager" -W -f /tmp/amap.ldif
    
    IFS=$'\n'
    for line in $(cat /dev/shm/nis-map.$4); do
    	IFS=" "
    	key=$(echo "$line" | awk '{print $1}')
    	info=$(echo "$line" | sed -e "s^$key[ \t]*")
    	ipa automountkey-add nis $4 --key="$key" --info="$info"
    done
    Note

    The script exports the NIS automount information, generates an LDAP Data Interchange Format (LDIF) for the automount location and associated map, and imports the LDIF file into the IdM Directory Server.

  3. Authenticate as the IdM admin user:

    [root@nis-server ~]# kinit admin
  4. Run the script. For example:

    [root@nis-server ~]# sh /root/nis-automounts.sh location nisdomain
         nis-server.example.com map_name