1=pod
2
3=head1 NAME
4
5openssl-sess_id,
6sess_id - SSL/TLS session handling utility
7
8=head1 SYNOPSIS
9
10B<openssl> B<sess_id>
11[B<-help>]
12[B<-inform PEM|DER>]
13[B<-outform PEM|DER|NSS>]
14[B<-in filename>]
15[B<-out filename>]
16[B<-text>]
17[B<-noout>]
18[B<-context ID>]
19
20=head1 DESCRIPTION
21
22The B<sess_id> process the encoded version of the SSL session structure
23and optionally prints out SSL session details (for example the SSL session
24master key) in human readable format. Since this is a diagnostic tool that
25needs some knowledge of the SSL protocol to use properly, most users will
26not need to use it.
27
28=head1 OPTIONS
29
30=over 4
31
32=item B<-help>
33
34Print out a usage message.
35
36=item B<-inform DER|PEM>
37
38This specifies the input format. The B<DER> option uses an ASN1 DER encoded
39format containing session details. The precise format can vary from one version
40to the next.  The B<PEM> form is the default format: it consists of the B<DER>
41format base64 encoded with additional header and footer lines.
42
43=item B<-outform DER|PEM|NSS>
44
45This specifies the output format. The B<PEM> and B<DER> options have the same meaning
46and default as the B<-inform> option. The B<NSS> option outputs the session id and
47the master key in NSS keylog format.
48
49=item B<-in filename>
50
51This specifies the input filename to read session information from or standard
52input by default.
53
54=item B<-out filename>
55
56This specifies the output filename to write session information to or standard
57output if this option is not specified.
58
59=item B<-text>
60
61Prints out the various public or private key components in
62plain text in addition to the encoded version.
63
64=item B<-cert>
65
66If a certificate is present in the session it will be output using this option,
67if the B<-text> option is also present then it will be printed out in text form.
68
69=item B<-noout>
70
71This option prevents output of the encoded version of the session.
72
73=item B<-context ID>
74
75This option can set the session id so the output session information uses the
76supplied ID. The ID can be any string of characters. This option won't normally
77be used.
78
79=back
80
81=head1 OUTPUT
82
83Typical output:
84
85 SSL-Session:
86     Protocol  : TLSv1
87     Cipher    : 0016
88     Session-ID: 871E62626C554CE95488823752CBD5F3673A3EF3DCE9C67BD916C809914B40ED
89     Session-ID-ctx: 01000000
90     Master-Key: A7CEFC571974BE02CAC305269DC59F76EA9F0B180CB6642697A68251F2D2BB57E51DBBB4C7885573192AE9AEE220FACD
91     Key-Arg   : None
92     Start Time: 948459261
93     Timeout   : 300 (sec)
94     Verify return code 0 (ok)
95
96These are described below in more detail.
97
98=over 4
99
100=item B<Protocol>
101
102This is the protocol in use TLSv1.3, TLSv1.2, TLSv1.1, TLSv1 or SSLv3.
103
104=item B<Cipher>
105
106The cipher used this is the actual raw SSL or TLS cipher code, see the SSL
107or TLS specifications for more information.
108
109=item B<Session-ID>
110
111The SSL session ID in hex format.
112
113=item B<Session-ID-ctx>
114
115The session ID context in hex format.
116
117=item B<Master-Key>
118
119This is the SSL session master key.
120
121=item B<Start Time>
122
123This is the session start time represented as an integer in standard
124Unix format.
125
126=item B<Timeout>
127
128The timeout in seconds.
129
130=item B<Verify return code>
131
132This is the return code when an SSL client certificate is verified.
133
134=back
135
136=head1 NOTES
137
138The PEM encoded session format uses the header and footer lines:
139
140 -----BEGIN SSL SESSION PARAMETERS-----
141 -----END SSL SESSION PARAMETERS-----
142
143Since the SSL session output contains the master key it is
144possible to read the contents of an encrypted session using this
145information. Therefore appropriate security precautions should be taken if
146the information is being output by a "real" application. This is however
147strongly discouraged and should only be used for debugging purposes.
148
149=head1 BUGS
150
151The cipher and start time should be printed out in human readable form.
152
153=head1 SEE ALSO
154
155L<ciphers(1)>, L<s_server(1)>
156
157=head1 COPYRIGHT
158
159Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
160
161Licensed under the OpenSSL license (the "License").  You may not use
162this file except in compliance with the License.  You can obtain a copy
163in the file LICENSE in the source distribution or at
164L<https://www.openssl.org/source/license.html>.
165
166=cut
167