[Swan] Suggested cipher suites in Libreswan 3.29

[Tod Larson]

Building your config file to conform Suite B RFC 6379 is a good reference. 

https://datatracker.ietf.org/doc/rfc6379/?include_text=1

> On Jul 9, 2019, at 1:06 AM, Kaushal Shriyan <kaushalshriyan at gmail.com> wrote:
> 
> Thanks Paul for the help and much appreciated.
> 
>> On Tue, Jul 9, 2019 at 9:12 AM Paul Wouters <paul at nohats.ca> wrote:
>> On Tue, 9 Jul 2019, Kaushal Shriyan wrote:
>> 
>> > I am running libreswan version 3.29 on CentOS 7.6 and the details are as below:-
>> 
>> > I have the below config. 
>> >
>> >        conn apps-tomcat-primary
>> >               type=tunnel
>> >               authby=secret
>> >               left=%defaultroute
>> >               leftid=128.117.167.12
>> >               leftnexthop=%defaultroute
>> >               leftsubnet=128.117.167.12/32
>> >               right=126.114.94.7
>> >               rightsubnet=126.114.90.7/32
>> >               ike=aes128-sha1;modp1024
>> 
>> Note using DH2 makes no sense. It's too weak. libreswan-3.30 has it
>> compile time disabled by default.
>> 
>> >               phase2alg=aes128-sha1;modp1536
>> 
>> It also makes little sense to have a larger phase2 DH group.
>> 
>> >               pfs=yes
>> >               auto=start
>> >               ikev2=no
>> > 
>> > 
>> > I will appreciate if you can let me know the suggested cipher suites (encryption and authentication) to be implemented as per the above Libreswan IPsec configuration.
>> 
>> It will only allow what you specified on the ike= and esp= lines. Only
>> if you specify nothing in the conn, do you get default ciphers eiter
>> from conn %default or via the system-wide crypto policies (via conn
>> %default).
>> 
>> So your ike= line will only allow AES 128 bit key, SHA1 for PRF and
>> INTEG, using DH2. Your esp=/phase2alg- line only allows AES 128 bit key,
>> SHA1 for INTEG and DH5 Quickmode/PFS.
>> 
>> Paul
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