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We need to disable the key generation of RSA and DSA keys < 2048 bits in the FIPS mode.

This is needed to fulfill the NIST SP800-131a specification. It is not strictly required for FIPS-140-2 conformance but we want to make it easier to not break the SP800-131a inadvertently by customers and applications.

libreswan does not allow anything smaller than 2192.

openswan does allow that, unless the limitation is enforced by nss, as it is using the PK11_GenerateKeyPair() call for these. If this should be enforced within openswan, please let me know and/or create a bug for it.

Paul, it is not necessary to enforce in the code. It is sufficient to document that for compliance with SP800-131a RSA and DSA keys >= 2048 bits must be used.

Well, as upstream I also would like to only allow secure features in security software. But I'll mark it as a bug in the upstream libreswan tracker :)

To enforce this key generation limits, the environment variable OPENSSL_ENFORCE_MODULUS_BITS must be set.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1525.html