sendmail, 4th Edition

${tls_version}

TLS/SSL version V8.11 and above

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} ).



Sendmail
sendmail, 4th Edition
ISBN: 0596510292
EAN: 2147483647
Year: 2002
Pages: 1174

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