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InfluxDB
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I wrote pam_ldap and did the initial port to Darwin. It is probably showing its age - you probably want better integration with GSS-API and also something like CredUI [1] for GUI support. But it's a great deal better than having to modify /bin/login each time you add an authentication mechanism! And although each implementation has its quirks, its age and thus relative simplicity means that it was quite widely implemented.
[1] https://github.com/PADL/CredUI
Not to mention that linux-pam's `[success=2 default=ignore]` isn't even standard, I think OpenPAM only has the five control flags required/requisite/sufficient/binding/optional. (One may reasonably despair as to the difference between "required" and "requisite".)
It's almost as if PAM were developed before the invention of the if-then-else construct in the 1950s.[0]
[0]: https://github.com/e-n-f/if-then-else/blob/master/if-then-el...