${tls_version}
TLS/SSL version V8.11 and later
When a connection is made or received and STARTTLS is
initiated, sendmail updates the
value of several macros, among which is this
${tls_version}
macro.
${tls_version}
stores the TLS version used for the connection. The
possible versions are text values that include
TLSv1
, SSLv3
, and SSLv2
. The ${tls_version}
is used
in the standard configuration file as part of the
definition of the Received
: header:
HReceived: $?sfrom $s $.$?_($?s$|from $.$_) $.$?{auth_type}(authenticated$?{auth_ssf} bits=${auth_ssf}$.) $.by $j ($v/$Z)$?r with $r$. id $i$?{tls_version}
(version=${tls_version} cipher=${cipher} bits=${cipher_bits}
verify=${verify})$.
$?u for $u; $|; $.$b
If ${tls_version}
has a value, the following is included in the
Received
:
header’s text:
(version=${tls_version} cipher=${cipher} bits=${cipher_bits} verify=${verify})
If ${tls_version}
lacks a value, the preceding text is not included,
meaning that a STARTTLS session was not used.
${tls_version}
is
transient. If it is defined in the configuration
file or in the command line, that definition is
ignored by sendmail. Note that
a $&
prefix
is necessary when you reference this macro in rules
(that is, use $&{tls_version}
, not ${tls_version}
).
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