1SESS_ID(1) OpenSSL SESS_ID(1)
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6 openssl-sess_id, sess_id - SSL/TLS session handling utility
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9 openssl sess_id [-help] [-inform PEM|DER] [-outform PEM|DER|NSS] [-in
10 filename] [-out filename] [-text] [-noout] [-context ID]
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13 The sess_id process the encoded version of the SSL session structure
14 and optionally prints out SSL session details (for example the SSL
15 session master key) in human readable format. Since this is a
16 diagnostic tool that needs some knowledge of the SSL protocol to use
17 properly, most users will not need to use it.
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20 -help
21 Print out a usage message.
22 -inform DER|PEM
24 This specifies the input format. The DER option uses an ASN1 DER
25 encoded format containing session details. The precise format can
26 vary from one version to the next. The PEM form is the default
27 format: it consists of the DER format base64 encoded with
28 additional header and footer lines.
29 -outform DER|PEM|NSS
31 This specifies the output format. The PEM and DER options have the
32 same meaning and default as the -inform option. The NSS option
33 outputs the session id and the master key in NSS keylog format.
34 -in filename
36 This specifies the input filename to read session information from
37 or standard input by default.
38 -out filename
40 This specifies the output filename to write session information to
41 or standard output if this option is not specified.
42 -text
44 Prints out the various public or private key components in plain
45 text in addition to the encoded version.
46 -cert
48 If a certificate is present in the session it will be output using
49 this option, if the -text option is also present then it will be
50 printed out in text form.
51 -noout
53 This option prevents output of the encoded version of the session.
54 -context ID
56 This option can set the session id so the output session
57 information uses the supplied ID. The ID can be any string of
58 characters. This option won't normally be used.
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61 Typical output:
62 SSL-Session:
64 Protocol : TLSv1
65 Cipher : 0016
66 Session-ID: 871E62626C554CE95488823752CBD5F3673A3EF3DCE9C67BD916C809914B40ED
67 Session-ID-ctx: 01000000
68 Master-Key: A7CEFC571974BE02CAC305269DC59F76EA9F0B180CB6642697A68251F2D2BB57E51DBBB4C7885573192AE9AEE220FACD
69 Key-Arg : None
70 Start Time: 948459261
71 Timeout : 300 (sec)
72 Verify return code 0 (ok)
73 Theses are described below in more detail.
75 Protocol
77 This is the protocol in use TLSv1.3, TLSv1.2, TLSv1.1, TLSv1 or
78 SSLv3.
79 Cipher
81 The cipher used this is the actual raw SSL or TLS cipher code, see
82 the SSL or TLS specifications for more information.
83 Session-ID
85 The SSL session ID in hex format.
86 Session-ID-ctx
88 The session ID context in hex format.
89 Master-Key
91 This is the SSL session master key.
92 Start Time
94 This is the session start time represented as an integer in
95 standard Unix format.
96 Timeout
98 The timeout in seconds.
99 Verify return code
101 This is the return code when an SSL client certificate is verified.
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104 The PEM encoded session format uses the header and footer lines:
105 -----BEGIN SSL SESSION PARAMETERS-----
107 -----END SSL SESSION PARAMETERS-----
108 Since the SSL session output contains the master key it is possible to
110 read the contents of an encrypted session using this information.
111 Therefore appropriate security precautions should be taken if the
112 information is being output by a "real" application. This is however
113 strongly discouraged and should only be used for debugging purposes.
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116 The cipher and start time should be printed out in human readable form.
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119 ciphers(1), s_server(1)
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122 Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
123 Licensed under the OpenSSL license (the "License"). You may not use
125 this file except in compliance with the License. You can obtain a copy
126 in the file LICENSE in the source distribution or at
127 <https://www.openssl.org/source/license.html>.
1281.1.1 2018-09-11 SESS_ID(1)