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

[Benjamin Kaduk]

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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