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