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by vertex-four 3008 days ago
There's various methods to put SSH keys in LDAP. LDAP is an extensible database, so you can add a schema to attach SSH keys to a user (various schemas exist) - and the AuthorizedKeysCommand in your sshd_config can be hooked up to any program which can retrieve keys for a given user from anywhere (again, various programs exist).

As an example already put together: https://github.com/jirutka/ssh-ldap-pubkey