Manual: openssl-sess_id

OPENSSL-SESS_ID(1SSL)					   OpenSSL				       OPENSSL-SESS_ID(1SSL)

NAME
       openssl-sess_id - SSL/TLS session handling command

SYNOPSIS
       openssl sess_id [-help] [-inform DER|PEM] [-outform DER|PEM|NSS] [-in filename] [-out filename] [-text] [-cert]
       [-noout] [-context ID]

DESCRIPTION
       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.

OPTIONS
       -help
	   Print out a usage message.

       -inform DER|PEM, -outform DER|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.

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

       -out filename
	   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.

       -context ID
	   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.

OUTPUT
       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.

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

       Timeout
	   The timeout in seconds.

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

NOTES
       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.

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

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

COPYRIGHT
       Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.

       Licensed	 under	the  Apache  License  2.0  (the "License").  You may not use this file except in compliance with the
       License.	   You	 can   obtain	a   copy   in	the   file   LICENSE   in   the	  source    distribution    or	  at
       .

3.5.5							 2026-01-27				       OPENSSL-SESS_ID(1SSL)