Zentrale Benutzerverwaltung mit OpenLDAP und SSS

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Installation

passwort nach wahl festlegen
  • apt update
  • DEBIAN_FRONTEND=noninteractive apt install -y slapd ldap-utils

Grundkonfiguration

  • dpkg-reconfigure slapd
Debconf Question Recommended Input
Omit OpenLDAP server configuration? No
DNS domain name: it213.int
Organization name: it213
Administrator password: 123Start$
Database backend to use: MDB
Remove database when slapd is purged? No
Move old database? Yes
Allow LDAPv2 protocol? No

ldap.conf setzen

  • vim /etc/ldap/ldap.conf
BASE    dc=it213,dc=int
URI     ldap://ldap.it213.int
ldap_version    3

Kontrolle

  • ldapsearch -x -LLL

Grundstruktur

Erstellen

  • cat <<EOF > /root/struktur.ldif
dn: ou=users,dc=it213,dc=int
objectClass: organizationalUnit
ou: users

dn: ou=groups,dc=it213,dc=int
objectClass: organizationalUnit
ou: groups

dn: ou=hosts,dc=it213,dc=int
objectClass: organizationalUnit
ou: hosts

dn: ou=sudo,dc=it213,dc=int
objectClass: organizationalUnit
ou: sudo

EOF

Anlegen

  • ldapadd -xD cn=admin,dc=it213,dc=int -w 123Start$ -f /root/struktur.ldif

Benutzer und Gruppen

  • apt install -y ldapscripts

Konfiguration

  • vim /etc/ldapscripts/ldapscripts.conf
SERVER="ldap://ldap.it213.int"
SUFFIX="dc=it213,dc=int"
GSUFFIX="ou=groups"
USUFFIX="ou=users"
MSUFFIX="ou=hosts"
BINDDN="cn=admin,dc=it213,dc=int"
USHELL="/bin/bash"
UHOMES="/home/%u"
CREATEHOMES="yes"
HOMESKEL="/etc/skel"
BINDPWDFILE="/etc/ldapscripts/ldapscripts.passwd"
GIDSTART="10000" # Group ID
UIDSTART="10000" # User ID
MIDSTART="20000" # Machine ID
GCLASS="posixGroup"   # Leave "posixGroup" here if not sure !
PASSWORDGEN="pwgen"
RECORDPASSWORDS="no"
PASSWORDFILE="/var/log/ldapscripts_passwd.log"
LOGTOFILE="yes"
LOGFILE="/var/log/ldapscripts.log"
LOGTOSYSLOG="no"
SYSLOGFACILITY="local4"
SYSLOGLEVEL="info"
LDAPSEARCHBIN="/usr/bin/ldapsearch"
LDAPADDBIN="/usr/bin/ldapadd"
LDAPDELETEBIN="/usr/bin/ldapdelete"
LDAPMODIFYBIN="/usr/bin/ldapmodify"
LDAPMODRDNBIN="/usr/bin/ldapmodrdn"
LDAPPASSWDBIN="/usr/bin/ldappasswd"
LDAPSEARCHOPTS="-o ldif-wrap=no"
GETENTPWCMD=""
GETENTGRCMD=""
GTEMPLATE=""
UTEMPLATE=""
MTEMPLATE=""
  • echo -n "123Start$" > /etc/ldapscripts/ldapscripts.passwd
  • chmod 600 /etc/ldapscripts/ldapscripts.passwd

Gruppen

  • ldapaddgroup it
  • ldapaddgroup sudo

Benutzer

  • ldapadduser thomas it
  • ldapadduser tina it

Passwort

  • ldapsetpasswd thomas
  • ldapsetpasswd tina

Gruppe zuweisen

  • ldapaddusertogroup thomas sudo
  • ldapaddusertogroup tina sudo

SSSD Anbindung

  • apt install sssd libnss-sss libpam-sss libsss-sudo

Konfiguration

  • vim /etc/sssd/sssd.conf
[sssd]
services = nss, pam, sudo
domains = it213.int

[domain/it213.int]
id_provider = ldap
auth_provider = ldap
access_provider = permit

sudo_provider = ldap

ldap_uri = ldap://ldap.it213.int
ldap_search_base = dc=it213,dc=int
ldap_sudo_search_base = ou=sudo,dc=it213,dc=int


# TLS komplett deaktivieren (für Testumgebungen)
ldap_id_use_start_tls = false
ldap_auth_disable_tls_never_use_in_production = true
ldap_tls_reqcert = never
  • chmod 600 /etc/sssd/sssd.conf
  • systemctl restart sssd

NSS

Nur Kontrolle
  • cat /etc/nsswitch.conf

passwd:         files systemd sss
group:          files systemd sss
shadow:         files systemd sss
gshadow:        files systemd

hosts:          files dns
networks:       files

protocols:      db files
services:       db files sss
ethers:         db files
rpc:            db files

netgroup:       nis sss
sudoers: files  sss
automount:  sss

PAM

  • pam-auth-update --enable sss mkhomedir
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