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From: | Josh McAtee |
Subject: | Re: [lwip-users] Elevating existing connection to TLS |
Date: | Tue, 28 Apr 2020 16:09:35 -0700 |
User-agent: | Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 |
Sorry if I wasn't being clear. Take the existing SMTP app, for example - it uses the altcp layer already.But, the connection can only be made either with or without TLS from the beginning of the connection. I want to implement STARTTLS, in which the connection starts out plain TCP and then is elevated to TLS later, after the STARTTLS command is sent from the client (and 220 go ahead received back from the server). So the TLS handshake starts after the connection has already been established and some non-TLS communication has already been made.
Does that make sense?
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