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Multiplex HTTPS, IMAP and SMTP on port 443

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Services are distinguished based on ALPN.
For example,
    openssl s_client -connect example.org:443 -alpn smtp
gives SMTP connection and
    openssl s_client -connect example.org:443 -alpn imap
gives IMAP connection.
This commit is contained in:
link2xt
2024-07-11 05:31:02 +00:00
parent 180cfb3951
commit 283045dc4a
4 changed files with 38 additions and 6 deletions
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README.md
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@@ -155,7 +155,8 @@ While this file is present, account creation will be blocked.
[Postfix](http://www.postfix.org/) listens on ports 25 (smtp) and 587 (submission) and 465 (submissions).
[Dovecot](https://www.dovecot.org/) listens on ports 143 (imap) and 993 (imaps).
[nginx](https://www.nginx.com/) listens on port 443 (https).
[nginx](https://www.nginx.com/) listens on port 8443 (https-alt) and 443 (https).
Port 443 multiplexes HTTPS, IMAP and SMTP using ALPN to redirect connections to ports 8443, 465 or 993.
[acmetool](https://hlandau.github.io/acmetool/) listens on port 80 (http).
Delta Chat apps will, however, discover all ports and configurations