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Bron: http://pig.made-it.com/ldap-openssh.html

Deze Wiki pagina beschrijft de configuratie van OpenSSH voor het gebruik van sshPublicKeys in LDAP.

Voorbeeld machine: wordpress op Pilot platform.

Op wordpress moet de volgende ldapsearch query lukken:

$ ldapsearch -H ldaps://ldap.pilot.scz.lab.surf.nl -b 'dc=pilot,dc=scz,dc=lab,dc=surf,dc=nl' -D 'cn=Admin,dc=pilot,dc=scz,dc=lab,dc=surf,dc=nl' -w *** sshPublicKey
# vi /opt/fetchSSHKeysFromLDAP
#!/bin/sh
ldapsearch \
-H ldaps://ldap.pilot.scz.lab.surf.nl \
-b 'dc=pilot,dc=scz,dc=lab,dc=surf,dc=nl' \
-D 'cn=Admin,dc=pilot,dc=scz,dc=lab,dc=surf,dc=nl' \
-w *** \
'(&(objectClass=ldapPublicKey)(uid='"$1"'))' \
'sshPublicKey' \
| sed -n '/^ /{H;d};/sshPublicKey:/x;$g;s/\n *//g;s/sshPublicKey: //gp'
# chmod 500 /opt/fetchSSHKeysFromLDAP
# vi /etc/ssh/sshd_config
+ AuthorizedKeysCommand /opt/fetchSSHKeysFromLDAP
+ AuthorizedKeysCommandUser root
# systemctl restart sshd

Maak een pub/priv keypair

$ ssh-keygen

copy-paste .ssh/id_rsa.pub in COmanage id SSH Key (without "ssh-rsa" prefix!)

CO manage id add identifiers:

  • uid
  • uidNumber
  • gidNumber
  • homeDirectory

COManage: Reprovision All

Controleer LDAP sshPublicKey:

# /opt/fetchSSHKeysFromLDAP martinus
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAA.... martinus@wordpress ...
# apt install libnss-ldap
# vi /etc/nsswitch.conf
- passwd: compat
- group: compat
+ passwd: compat ldap
+ group: compat ldap

In case apt install libnss-ldap did not ask for configuration questions:

# vi /etc/libnss-ldap.conf
+ base dc=pilot,dc=scz,dc=lab,dc=surf,dc=nl
+ uri ldaps://ldap.pilot.scz.lab.surf.nl/
+ ldap_version 3
+ rootbinddn cn=Admin,dc=pilot,dc=scz,dc=lab,dc=surf,dc=nl
# vi /etc/libnss-ldap.secret
+ *****
# vi /etc/pam_ldap.conf
+ base dc=pilot,dc=scz,dc=lab,dc=surf,dc=nl
+ uri ldaps://ldap.pilot.scz.lab.surf.nl/
+ ldap_version 3
+ binddn cn=Admin,dc=pilot,dc=scz,dc=lab,dc=surf,dc=nl
+ bindpw ******
+ rootbinddn cn=Admin,dc=pilot,dc=scz,dc=lab,dc=surf,dc=nl
# vi /etc/pam_ldap.secret
+ *****
# vi /usr/share/pam-configs/mkhomedir
Name: activate mkhomedir
Default: yes
Priority: 900
Session-Type: Additional
Session:
required pam_mkhomedir.so umask=0022 skel=/etc/skel
# vi /etc/pam.d/sshd
+ session required pam_mkhomedir.so umask=0022 skel=/etc/skel
# Standard Un*x session setup and teardown.

Test configuration.

# getent passwd

...

martinus:*:1035:1035:Bassie Baas:/home/baas:/bin/bash
# id <testuser in ldap>
uid=1035(martinus) gid=1035 groups=1035

Test ssh login:

$ ssh -i ~martin/.ssh/id_rsa martinus@localhost
Linux wordpress 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 (2018-05-07) x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Mon Jun 25 11:53:04 2018 from 127.0.0.1
martinus@wordpress:~$ pwd
/home/baas
martinus@wordpress:~$

 

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