OPENSSL-SESS_ID - Online Linux Manual PageSection : 1ossl
Updated : 2023-03-21
Source : 3.0.8
Note : OpenSSL
NAMEopenssl−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]
DESCRIPTIONThis 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.
OUTPUTTypical 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.
NOTESSince 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.
BUGSThe cipher and start time should be printed out in human readable form.
SEE ALSO​openssl (1), ​openssl−ciphers (1), ​openssl−s_server (1)
COPYRIGHTCopyright 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 <https://www.openssl.org/source/license.html>. 0
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