This project provides an utility to manage SSH public keys stored in LDAP and also a script for OpenSSH server to load authorized keys from LDAP.
When you have dozen of servers it becomes difficult to manage your authorized keys. You have to
copy all your public keys to
~/.ssh/authorized_keys on every server you want to login to. And
what if you someday change your keys?
It’s a good practice to use some kind of a centralized user management, usually an LDAP server. There you have user’s login, uid, e-mail, … and password. What if we could also store public SSH keys on LDAP server? With this utility it’s easy as pie.
If you need just a lightweight utility for OpenSSH server to load authorized keys from LDAP,
then you can use ssh-getkey-ldap written in Lua
or this one written in POSIX shell
(but it requires
ldapsearch utility and may not work well on some systems).
You can install both Python modules from PyPI. pyldap (and python-ldap) requires additional system dependencies – OpenLDAP. Refer to Stack Overflow for distribution-specific information.
pip install ssh-ldap-pubkey
apk add ssh-ldap-pubkey
Note: The package is currently in the (official) community repository; make sure that you have community in
List SSH public keys stored in LDAP for the current user:
List SSH public keys stored in LDAP for the specified user:
ssh-ldap-pubkey list -u flynn
Add the specified SSH public key for the current user to LDAP:
ssh-ldap-pubkey add ~/.ssh/id_rsa.pub
Remove SSH public key(s) of the current user that matches the specified pattern:
ssh-ldap-pubkey del flynn@grid
Specify LDAP URI and base DN on command line instead of configuration file:
ssh-ldap-pubkey list -b ou=People,dc=encom,dc=com -H ldaps://encom.com -u flynn
As the LDAP manager, add SSH public key to LDAP for the specified user:
ssh-ldap-pubkey add -D cn=Manager,dc=encom,dc=com -u flynn ~/.ssh/id_rsa.pub
Show help for other options:
Configuration is read from /etc/ldap.conf — file used by LDAP nameservice switch library and the LDAP PAM module. An example file is included in etc/ldap.conf. The following subset of parameters are used:
pam_login_attribute=<login>). Default is objectclass=posixAccount.
ldaps://), leave this empty.
The only required parameter is nss_base_passwd or base, others have sensitive defaults. You
might want to define uri parameter as well. These parameters can be also defined/overriden
--uri options on command line.
For more information about these parameters refer to ldap.conf man page.
To configure OpenSSH server to fetch users’ authorized keys from LDAP server:
Make sure that you have installed ssh-ldap-pubkey and ssh-ldap-pubkey-wrapper in
/usr/bin with owner
root and mode
Add these two lines to /etc/ssh/sshd_config:
AuthorizedKeysCommand /usr/bin/ssh-ldap-pubkey-wrapper AuthorizedKeysCommandUser nobody
Restart sshd and check log file if there’s no problem.
Note: This method is supported by OpenSSH since version 6.2-p1 (or 5.3 onRedHat). If you have an older version and can’t upgrade, for whatever weird reason, use openssh-lpk patch instead.
Just add the openssh-lpk.schema to your LDAP server, or add an attribute named
to any existing schema which is already defined in people entries. That’s all.
Note: Presumably, you’ve already setup your LDAP server for centralized unix users management, i.e. you have the NIS schema and users in LDAP.
This project is licensed under MIT license.