OpenPAM is an open source PAM library that focuses on simplicity, correctness, and cleanliness.
OpenPAM aims to gather the best features of Solaris PAM, XSSO and Linux-PAM, plus some innovations of its own. In areas where these implementations disagree, OpenPAM tries to remain compatible with Solaris, at the expense of XSSO conformance and Linux-PAM compatibility.
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