Ldap Client per SSSD

SSSD Client-Konfiguration

SSSD (System Security Services Daemon) ersetzt die alte Konfiguration mit libnss-ldap und libpam-ldap.

Installation

• apt install sssd-ldap ldap-utils

CA Cert besorgen

• cd /etc/ldap/
• wget https://web.samogo.de/certs/ca.crt

ldap.conf (Client)

• cat /etc/ldap/ldap.conf

# Basis-Domain für Suchanfragen
BASE    dc=it213,dc=int
# LDAPS-Server (TLS auf Port 636)
URI     ldaps://ldap.it213.int
# TLS / Zertifikatsprüfung
TLS_CACERT      /etc/ldap/ca.crt
TLS_REQCERT     demand
# Minimale TLS-Verison (optional, aber empfohlen)
TLS_PROTOCOL_MIN    1.2

SSSD Konfiguration

• vim /etc/sssd/sssd.conf

[sssd]
config_file_version = 2
services = nss, pam
domains = it213.int

[domain/it213.int]
id_provider = ldap
auth_provider = ldap
chpass_provider = ldap

# DNS Service Discovery nutzen (benötigt SRV Records!)
#ldap_uri = _srv_
#dns_discovery_domain = it213.int

# Direkte URI statt DNS Discovery
ldap_uri = ldaps://ldap.it213.int

ldap_search_base = dc=it213,dc=int

ldap_default_bind_dn = cn=admin,dc=it213,dc=int
ldap_default_authtok_type = password
ldap_default_authtok = 123Start$

# TLS komplett deaktivieren (für Testumgebungen)
ldap_id_use_start_tls = false
#ldap_auth_disable_tls_never_use_in_production = true
ldap_tls_reqcert = demand

cache_credentials = true
enumerate = true

[nss]
filter_users = root,daemon,bin,sys,sync,games,man,lp,mail,news,uucp,proxy,www-data,backup,list,irc,gnats,nobody,systemd-network,systemd-resolve,messagebus,_apt,uuidd,nslcd
filter_groups = root,daemon,bin,sys,adm,tty,disk,lp,mail,news,uucp,man,proxy,kmem,dialout,fax,voice,cdrom,floppy,tape,sudo,audio,dip,www-data,backup,operator,list,irc,src,gnats,shadow,utmp,video,sasl,plugdev,staff,games,users,nogroup,systemd-journal,systemd-network,systemd-resolve,input,kvm,render,crontab,netdev,messagebus,_apt,uuidd,ssh,nslcd

[pam]
offline_credentials_expiration = 2

Alternative ohne DNS SRV Records:

Falls die DNS SRV Records nicht funktionieren, kann man auch direkt den Server angeben:

[domain/it113.int]
id_provider = ldap
auth_provider = ldap
chpass_provider = ldap

# Direkte URI statt DNS Discovery
ldap_uri = ldap://ldap.it113.int:389

ldap_search_base = dc=it113,dc=int

# TLS deaktivieren
ldap_id_use_start_tls = false
ldap_auth_disable_tls_never_use_in_production = true
ldap_tls_reqcert = never
# ... rest wie oben

Berechtigungen setzen

chmod 600 /etc/sssd/sssd.conf

SSSD Service aktivieren und starten

systemctl enable sssd
systemctl start sssd