openssl-sess_id - SSL/TLS session handling command

       The cipher and start time should be printed out in human readable form.

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       Licensed  under  the  Apache License 2.0 (the "License").  You may not use this file except in compliance
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       <https://www.openssl.org/source/license.html>.

3.4.1                                              2025-04-03                              OPENSSL-SESS_ID(1SSL)

       This command processes the encoded version of the SSL session structure and optionally prints out SSL
       session details (for example the SSL session master key) in human readable format. Since this is a
       diagnostic tool that needs some knowledge of the SSL protocol to use properly, most users will not need
       to use it.

       The precise format of the data can vary across OpenSSL versions and is not documented.

       openssl-sess_id - SSL/TLS session handling command

       Since  the SSL session output contains the master key it is possible to read the contents of an encrypted
       session using this information. Therefore, appropriate  security  precautions  should  be  taken  if  the
       information is being output by a "real" application. This is however strongly discouraged and should only
       be used for debugging purposes.

-help
           Print out a usage message.

       -informDER|PEM, -outformDER|PEM|NSS
           The input and output formats; the default is PEM.  See openssl-format-options(1) for details.

           For NSS output, the session ID and master key are reported in NSS "keylog" format.

       -infilename
           This specifies the input filename to read session information from or standard input by default.

       -outfilename
           This  specifies the output filename to write session information to or standard output if this option
           is not specified.

       -text
           Prints out the various public or private key components in plain text  in  addition  to  the  encoded
           version.

       -cert
           If  a  certificate is present in the session it will be output using this option, if the -text option
           is also present then it will be printed out in text form.

       -noout
           This option prevents output of the encoded version of the session.

       -contextID
           This option can set the session id so the output session information uses the supplied ID. The ID can
           be any string of characters. This option won't normally be used.

       Typical output:

        SSL-Session:
            Protocol  : TLSv1
            Cipher    : 0016
            Session-ID: 871E62626C554CE95488823752CBD5F3673A3EF3DCE9C67BD916C809914B40ED
            Session-ID-ctx: 01000000
            Master-Key: A7CEFC571974BE02CAC305269DC59F76EA9F0B180CB6642697A68251F2D2BB57E51DBBB4C7885573192AE9AEE220FACD
            Key-Arg   : None
            Start Time: 948459261
            Timeout   : 300 (sec)
            Verify return code 0 (ok)

       These are described below in more detail.

       Protocol
           This is the protocol in use TLSv1.3, TLSv1.2, TLSv1.1, TLSv1 or SSLv3.

       Cipher
           The cipher used this is the actual raw SSL or TLS cipher code, see the SSL or TLS specifications  for
           more information.

       Session-ID
           The SSL session ID in hex format.

       Session-ID-ctx
           The session ID context in hex format.

       Master-Key
           This is the SSL session master key.

       StartTime
           This is the session start time represented as an integer in standard Unix format.

       Timeout
           The timeout in seconds.

       Verifyreturncode
           This is the return code when an SSL client certificate is verified.

openssl(1), openssl-ciphers(1), openssl-s_server(1)

opensslsess_id [-help] [-informDER|PEM] [-outformDER|PEM|NSS] [-infilename] [-outfilename] [-text]
       [-cert] [-noout] [-contextID]