[openssl-users] Two sessions in a single full handshake

[Richard]

B I

On Sat, Sep 29, 2018 at 10:06 PM John Jiang <john.sha.jiang at gmail.com>
wrote:

> Now that full handshake sends two sessions, does that mean option
> -sess_out saves both of the sessions to a local file?
> If so, when resume session via option -sess_in, which session will be
> resumed?
>
> On Sun, Sep 30, 2018 at 11:47 AM Benjamin Kaduk via openssl-users <
> openssl-users at openssl.org> wrote:
>
>> s_client has -sess_out and -sess_in options that can be used
>> to save session information to a file and read it in for a subsequent
>> connection.  Neither is used by default.
>>
>> -Ben
>>
>> On Sun, Sep 30, 2018 at 11:06:14AM +0800, John Jiang wrote:
>> > Does s_client resume any session in the local session file?
>> >
>> > On Sun, Sep 30, 2018 at 3:19 AM Salz, Rich via openssl-users <
>> > openssl-users at openssl.org> wrote:
>> >
>> > >
>> > >    - The debug logs display two "SSL-Session" blocks in a full
>> handshake.
>> > >
>> > > Only one "SSL-Session" block is displayed in a resumption.
>> > >
>> > > Why does full handshake has two sessions?
>> > >
>> > >
>> > >
>> > > This is part of the TLS 1.3 standard.  A server can send back multiple
>> > > sessions, so that a client may resume with a different session, and
>> > > therefore prevent an observer from “linking” two different activities.
>> > > --
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