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libreswan's compiled against nss from a few weeks ago works finr. But if nss is upgraded, due to a change in nss, the libreswan aes_gcm code fails. Luckily libreswan does a selftest on boot, so this is obvious and libreswan fails to start using:

        jambuf = {array = 0x7ffc4f3c8d20 "ABORT: ASSERTION FAILED: test_gcm_vectors(&ike_alg_encrypt_aes_gcm_16, aes_gcm_tests) (in test_ike_alg() at ike_alg_test.c:41)", total = 126, roof = 1023, 


The workaround for this is to recompile libreswan and setting:

#define NSS_PKCS11_2_0_COMPAT 1

When compiled with that, libreswan remains using the old nss abi properly

This problem has been spotted on various distributions, including fedora.


The failure scenario is upgrading nss on its own.

While this fix may come too late for some (if they dont pull in a new libreswan, and do pull in a new nss, the problem manifests itself), having a newer libreswan available would work around the problem as well. In addition, the newer libreswan is ensured to not use a different nss api then expected.

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 (libreswan bug fix and enhancement update), and where to find the updated
files, follow the link below.

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

https://access.redhat.com/errata/RHEA-2020:4722