1=pod 2{- OpenSSL::safe::output_do_not_edit_headers(); -} 3 4=head1 NAME 5 6openssl-s_time - SSL/TLS performance timing program 7 8=head1 SYNOPSIS 9 10B<openssl> B<s_time> 11[B<-help>] 12[B<-connect> I<host>:I<port>] 13[B<-www> I<page>] 14[B<-cert> I<filename>] 15[B<-key> I<filename>] 16[B<-reuse>] 17[B<-new>] 18[B<-verify> I<depth>] 19[B<-time> I<seconds>] 20[B<-ssl3>] 21[B<-tls1>] 22[B<-tls1_1>] 23[B<-tls1_2>] 24[B<-tls1_3>] 25[B<-bugs>] 26[B<-cipher> I<cipherlist>] 27[B<-ciphersuites> I<val>] 28{- $OpenSSL::safe::opt_name_synopsis -} 29[B<-cafile> I<file>] 30{- $OpenSSL::safe::opt_trust_synopsis -} 31{- $OpenSSL::safe::opt_provider_synopsis -} 32 33=head1 DESCRIPTION 34 35This command implements a generic SSL/TLS client which 36connects to a remote host using SSL/TLS. It can request a page from the server 37and includes the time to transfer the payload data in its timing measurements. 38It measures the number of connections within a given timeframe, the amount of 39data transferred (if any), and calculates the average time spent for one 40connection. 41 42=head1 OPTIONS 43 44=over 4 45 46=item B<-help> 47 48Print out a usage message. 49 50=item B<-connect> I<host>:I<port> 51 52This specifies the host and optional port to connect to. 53 54=item B<-www> I<page> 55 56This specifies the page to GET from the server. A value of '/' gets the 57F<index.html> page. If this parameter is not specified, then this command 58will only perform the handshake to establish SSL connections but not transfer 59any payload data. 60 61=item B<-cert> I<certname> 62 63The certificate to use, if one is requested by the server. The default is 64not to use a certificate. The file is in PEM format. 65 66=item B<-key> I<keyfile> 67 68The private key to use. If not specified then the certificate file will 69be used. The file is in PEM format. 70 71=item B<-verify> I<depth> 72 73The verify depth to use. This specifies the maximum length of the 74server certificate chain and turns on server certificate verification. 75Currently the verify operation continues after errors so all the problems 76with a certificate chain can be seen. As a side effect the connection 77will never fail due to a server certificate verify failure. 78 79=item B<-new> 80 81Performs the timing test using a new session ID for each connection. 82If neither B<-new> nor B<-reuse> are specified, they are both on by default 83and executed in sequence. 84 85=item B<-reuse> 86 87Performs the timing test using the same session ID; this can be used as a test 88that session caching is working. If neither B<-new> nor B<-reuse> are 89specified, they are both on by default and executed in sequence. 90 91=item B<-bugs> 92 93There are several known bugs in SSL and TLS implementations. Adding this 94option enables various workarounds. 95 96=item B<-cipher> I<cipherlist> 97 98This allows the TLSv1.2 and below cipher list sent by the client to be modified. 99This list will be combined with any TLSv1.3 ciphersuites that have been 100configured. Although the server determines which cipher suite is used it should 101take the first supported cipher in the list sent by the client. See 102L<openssl-ciphers(1)> for more information. 103 104=item B<-ciphersuites> I<val> 105 106This allows the TLSv1.3 ciphersuites sent by the client to be modified. This 107list will be combined with any TLSv1.2 and below ciphersuites that have been 108configured. Although the server determines which cipher suite is used it should 109take the first supported cipher in the list sent by the client. See 110L<openssl-ciphers(1)> for more information. The format for this list is a 111simple colon (":") separated list of TLSv1.3 ciphersuite names. 112 113=item B<-time> I<length> 114 115Specifies how long (in seconds) this command should establish connections 116and optionally transfer payload data from a server. Server and client 117performance and the link speed determine how many connections it 118can establish. 119 120{- $OpenSSL::safe::opt_name_item -} 121 122{- $OpenSSL::safe::opt_trust_item -} 123 124{- $OpenSSL::safe::opt_provider_item -} 125 126=item B<-cafile> I<file> 127 128This is an obsolete synonym for B<-CAfile>. 129 130=item B<-ssl3>, B<-tls1>, B<-tls1_1>, B<-tls1_2>, B<-tls1_3> 131 132See L<openssl(1)/TLS Version Options>. 133 134=back 135 136=head1 NOTES 137 138This command can be used to measure the performance of an SSL connection. 139To connect to an SSL HTTP server and get the default page the command 140 141 openssl s_time -connect servername:443 -www / -CApath yourdir -CAfile yourfile.pem -cipher commoncipher [-ssl3] 142 143would typically be used (https uses port 443). I<commoncipher> is a cipher to 144which both client and server can agree, see the L<openssl-ciphers(1)> command 145for details. 146 147If the handshake fails then there are several possible causes, if it is 148nothing obvious like no client certificate then the B<-bugs> and 149B<-ssl3> options can be tried 150in case it is a buggy server. In particular you should play with these 151options B<before> submitting a bug report to an OpenSSL mailing list. 152 153A frequent problem when attempting to get client certificates working 154is that a web client complains it has no certificates or gives an empty 155list to choose from. This is normally because the server is not sending 156the clients certificate authority in its "acceptable CA list" when it 157requests a certificate. By using L<openssl-s_client(1)> the CA list can be 158viewed and checked. However, some servers only request client authentication 159after a specific URL is requested. To obtain the list in this case it 160is necessary to use the B<-prexit> option of L<openssl-s_client(1)> and 161send an HTTP request for an appropriate page. 162 163If a certificate is specified on the command line using the B<-cert> 164option it will not be used unless the server specifically requests 165a client certificate. Therefore, merely including a client certificate 166on the command line is no guarantee that the certificate works. 167 168=head1 BUGS 169 170Because this program does not have all the options of the 171L<openssl-s_client(1)> program to turn protocols on and off, you may not 172be able to measure the performance of all protocols with all servers. 173 174The B<-verify> option should really exit if the server verification 175fails. 176 177=head1 HISTORY 178 179The B<-cafile> option was deprecated in OpenSSL 3.0. 180 181=head1 SEE ALSO 182 183L<openssl(1)>, 184L<openssl-s_client(1)>, 185L<openssl-s_server(1)>, 186L<openssl-ciphers(1)>, 187L<ossl_store-file(7)> 188 189=head1 COPYRIGHT 190 191Copyright 2004-2021 The OpenSSL Project Authors. All Rights Reserved. 192 193Licensed under the Apache License 2.0 (the "License"). You may not use 194this file except in compliance with the License. You can obtain a copy 195in the file LICENSE in the source distribution or at 196L<https://www.openssl.org/source/license.html>. 197 198=cut 199