On Sat, Sep 10, 2022 at 01:59:50PM +0200, Cyborg via Exim-users wrote:
> 250 HELP
> HELO smtp.example.com
> 250 smtp.target.de Hello smtp.example.com [83.246.32.110]
> MAIL FROM:<t...@target.de>
> 250 OK
> RCPT TO:<recipientname>
> RENEGOTIATING
> 140149325708800:error:1420410A:SSL routines:SSL_renegotiate:wrong ssl
> version:ssl/ssl_lib.c:2143:
Your mistake is to expect a default invocation of s_client(1) to provide
a "transparent" channel. This is not the case, instead s_client(1)
interprets certain input lines specially (from 1.1.1 manpage):
CONNECTED COMMANDS
If a connection is established with an SSL server then any data
received from the server is displayed and any key presses will be sent
to the server. If
end of file is reached then the connection will be
closed down. When used interactively (which means neither -quiet nor
-ign_eof have been given), then certain commands are also recognized
which perform
special operations. These commands are a letter which
must appear at the start of a line. They are listed below.
Q End the current SSL connection and exit.
R Renegotiate the SSL session (TLSv1.2 and below only).
B Send a heartbeat message to the server (DTLS only)
k Send a key update message to the server (TLSv1.3 only)
K Send a key update message to the server and request one back
(TLSv1.3 only)
speaking of "case", one simple way to work around these is to issue all
SMTP commands in lower case.
rcpt to:<mailbox>
...
quit
rather than:
RCPT TO:<mailbox>
...
QUIT
Or use the "ign_eof" and/or the "-quiet" option.
--
Viktor.
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