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

[John Jiang]

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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> > >
>
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