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Rebase libreswan to 3.31

import bugfixes
* OE/32, keyingtries=0, shunt handling (addressed in other rbhz's)
* On initiator, do not retransmit on IKE_AUTH processing failure 
* On PPK failure, return AUTHENTICATION_FAILED
* Allow CP payload in CREATE_CHILD_SA (RFC 7296 Appendix C.4)
* Audit log IKE SA and IPsec SA failures for Common Criteria (CC)
* Updated SECCOMP syscall whitelist
* With non-default config file, connections loading was skipped
* Fix Opportunistic Encryption with Transport Mode policies
* fix for redirect-to type when it is FQDN
* addresspool: give new lease to different (xauth)usernames
* SAN checks should confirm IKE peer ID on responder too 


features
* XFRMi interface support
* IPv6 support for addresspool= option 
* IKEv2: New whack commands --rekey-ike and --rekey-ipsec
* IKEv2: Prefer RFC 7427 Digital Signatures for default authby=rsasig
* IKEv2: Refuse SHA1 for RFC 7427 Digital Signatures as per RFC 8247
* Support to disable SAN checks (require-id-on-certificate=no)
* Add audit-log=yes|no (default yes)
* new command "ipsec letsencrypt"
* Add config for PYTHON_BINARY, default being /usr/bin/python3 
* Add new USE_NSS_PRF, to use KDF from NSS
* Add USE_PRF_AES_XCBC, replaces USE_XCBC

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