On sssd client
authselect select sssd --force
systemctl enable --now sssd
[root@ldap-sssd ~]# id adam
uid=16859(adam) gid=100(users) groups=100(users)
[root@ldap-sssd ~]# su adam
bash-4.4$ su adam
Password:
su: Authentication failure
bash-4.4$
If I run
sssctl user-checks adam
I see this
user: adam
action: acct
service: system-auth
SSSD nss user lookup result:
- user name: adam
- user id: 16859
- group id: 100
- gecos: adam
- home directory: /home/adam
- shell: /bin/bash
SSSD InfoPipe user lookup result:
- name: adam
- uidNumber: 16859
- gidNumber: 100
- gecos: adam
- homeDirectory: /home/adam
- loginShell: /bin/bash
testing pam_acct_mgmt
pam_acct_mgmt: Permission denied
PAM Environment:
- no env -
on ldapmaster I confirm the password is correct
ldapsearch -x -H ldap://ldapmaster \
-D uid=adam,ou=Users,DC=srv,DC=world \
-w 1234 \
-b uid=adam,ou=Users,DC=srv,DC=world \
-s base \
"(objectclass=*)"
[root@ldapmaster ~]# clear
-s base "(objectclass=*)"4 -b uid=adam,ou=Users,DC=srv,DC=world
# extended LDIF
#
# LDAPv3
# base <uid=adam,ou=Users,DC=srv,DC=world> with scope baseObject
# filter: (objectclass=*)
# requesting: ALL
#
# adam, Users, srv.world
dn: uid=adam,ou=Users,dc=srv,dc=world
objectClass: top
objectClass: account
objectClass: posixAccount
objectClass: shadowAccount
cn: adam
uid: adam
uidNumber: 16859
gidNumber: 100
homeDirectory: /home/adam
loginShell: /bin/bash
gecos: adam
shadowLastChange: 0
shadowMax: 0
shadowWarning: 0
userPassword:: e1NTSEF9OVcvdStLUTM3Y1F2dE5hVGR2WktuSDZSMm0zRGlUckw=
# search result
search: 2
result: 0 Success
# numResponses: 2
# numEntries: 1
sssd client configs
nsswitch.conf
[root@ldap-sssd ~]# grep "^[^#;]" /etc/nsswitch.conf
passwd: sss files systemd
group: sss files systemd
netgroup: sss files
automount: sss files
services: sss files
shadow: files sss
hosts: files dns myhostname
aliases: files
ethers: files
gshadow: files
networks: files dns
protocols: files
publickey: files
rpc: files
ldap.conf
[root@ldap-sssd ~]# grep "^[^#;]" /etc/openldap/ldap.conf
BASE dc=srv,dc=world
URI ldap://ldapmaster
SASL_NOCANON on
URI ldap://ldapmaster
BASE dc=srv,dc=world
sssd.conf
[root@ldap-sssd ~]# grep "^[^#;]" /etc/sssd/sssd.conf
[sssd]
services = nss, pam, sudo
config_file_version = 2
domains = default
[sudo]
[nss]
[pam]
offline_credentials_expiration = 60
[domain/default]
ldap_id_use_start_tls = False
cache_credentials = True
ldap_search_base = dc=srv,dc=world
id_provider = ldap
auth_provider = ldap
chpass_provider = ldap
access_provider = ldap
sudo_provider = ldap
ldap_uri = ldap://ldapmaster
ldap_default_bind_dn = cn=Manager,ou=Users,dc=srv,dc=world
ldap_default_authtok_type = password
ldap_default_authtok = 1234
ldap_search_timeout = 50
ldap_network_timeout = 60
ldap_access_order = filter
ldap_access_filter = ((objectClass=posixAccount))
ldapmaster setup script
#https://www.server-world.info/en/note?os=CentOS_7&p=openldap
yum -y install openldap-servers openldap-clients firewalld mlocate man --nobest
updatedb
cp /usr/share/openldap-servers/DB_CONFIG.example /var/lib/ldap/DB_CONFIG
chown ldap. /var/lib/ldap/DB_CONFIG
systemctl start slapd
systemctl enable slapd
cat <<EOF > chrootpw.ldif
# specify the password generated above for "olcRootPW" section
dn: olcDatabase={0}config,cn=config
changetype: modify
add: olcRootPW
olcRootPW: 1234
EOF
ldapadd -Y EXTERNAL -H ldapi:/// -f chrootpw.ldif
ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/cosine.ldif
ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/nis.ldif
ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/inetorgperson.ldif
cat <<EOF > chdomain.ldif
dn: olcDatabase={1}monitor,cn=config
changetype: modify
replace: olcAccess
olcAccess: {0}to * by dn.base="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth"
read by dn.base="cn=Manager,dc=srv,dc=world" read by * none
dn: olcDatabase={2}mdb,cn=config
changetype: modify
replace: olcSuffix
olcSuffix: dc=srv,dc=world
dn: olcDatabase={2}mdb,cn=config
changetype: modify
replace: olcRootDN
olcRootDN: cn=Manager,dc=srv,dc=world
dn: olcDatabase={2}mdb,cn=config
changetype: modify
add: olcRootPW
olcRootPW: 1234
dn: olcDatabase={2}mdb,cn=config
changetype: modify
add: olcAccess
olcAccess: {0}to attrs=userPassword,shadowLastChange by
dn="cn=Manager,dc=srv,dc=world" write by anonymous auth by self write by * none
olcAccess: {1}to dn.base="" by * read
olcAccess: {2}to * by dn="cn=Manager,dc=srv,dc=world" write by * read
EOF
ldapmodify -Y EXTERNAL -H ldapi:/// -f chdomain.ldif
cat <<EOF > basedomain.ldif
# replace to your own domain name for "dc=***,dc=***" section
dn: dc=srv,dc=world
objectClass: top
objectClass: dcObject
objectclass: organization
o: Server World
dc: Srv
dn: cn=Manager,dc=srv,dc=world
objectClass: organizationalRole
cn: Manager
description: Directory Manager
dn: ou=Users,dc=srv,dc=world
objectClass: organizationalUnit
objectClass: top
ou: Users
dn: ou=Groups,dc=srv,dc=world
objectClass: organizationalUnit
objectClass: top
ou: Groups
EOF
ldapadd -x -w 1234 -D cn=Manager,dc=srv,dc=world -f basedomain.ldif
systemctl start firewalld
systemctl enable firewalld
firewall-cmd --add-service=ldap --permanent
firewall-cmd --reload
cat <<EOF > adam.ldif
dn: uid=adam,ou=Users,dc=srv,dc=world
objectClass: top
objectClass: account
objectClass: posixAccount
objectClass: shadowAccount
cn: adam
uid: adam
uidNumber: 16859
gidNumber: 100
homeDirectory: /home/adam
loginShell: /bin/bash
gecos: adam
userPassword: 1234
shadowLastChange: 0
shadowMax: 0
shadowWarning: 0
EOF
ldapadd -x -w 1234 -D "cn=Manager,dc=srv,dc=world" -f adam.ldif
ldappasswd -s 1234 -w 1234 -D "cn=Manager,dc=srv,dc=world" -x "uid=adam,ou=Users,dc=srv,dc=world"
Reference guides
https://www.server-world.info/en/note?os=CentOS_7&p=openldap
https://kifarunix.com/configure-sssd-for-openldap-authentication-on-centos-8/
