2 {- OpenSSL::safe::output_do_not_edit_headers(); -}
6 openssl-s_time - SSL/TLS performance timing program
12 [B<-connect> I<host>:I<port>]
14 [B<-cert> I<filename>]
19 [B<-nameopt> I<option>]
27 [B<-cipher> I<cipherlist>]
28 [B<-ciphersuites> I<val>]
29 {- $OpenSSL::safe::opt_trust_synopsis -}
31 =for openssl ifdef ssl3 tls1 tls1_1 tls1_2 tls1_3
35 This command implements a generic SSL/TLS client which
36 connects to a remote host using SSL/TLS. It can request a page from the server
37 and includes the time to transfer the payload data in its timing measurements.
38 It measures the number of connections within a given timeframe, the amount of
39 data transferred (if any), and calculates the average time spent for one
48 Print out a usage message.
50 =item B<-connect> I<host>:I<port>
52 This specifies the host and optional port to connect to.
56 This specifies the page to GET from the server. A value of '/' gets the
57 F<index.html> page. If this parameter is not specified, then this command
58 will only perform the handshake to establish SSL connections but not transfer
61 =item B<-cert> I<certname>
63 The certificate to use, if one is requested by the server. The default is
64 not to use a certificate. The file is in PEM format.
66 =item B<-key> I<keyfile>
68 The private key to use. If not specified then the certificate file will
69 be used. The file is in PEM format.
71 =item B<-verify> I<depth>
73 The verify depth to use. This specifies the maximum length of the
74 server certificate chain and turns on server certificate verification.
75 Currently the verify operation continues after errors so all the problems
76 with a certificate chain can be seen. As a side effect the connection
77 will never fail due to a server certificate verify failure.
79 =item B<-nameopt> I<option>
81 Option which determines how the subject or issuer names are displayed. The
82 I<option> argument can be a single option or multiple options separated by
83 commas. Alternatively the B<-nameopt> switch may be used more than once to
84 set multiple options. See the L<openssl-x509(1)> manual page for details.
88 Performs the timing test using a new session ID for each connection.
89 If neither B<-new> nor B<-reuse> are specified, they are both on by default
90 and executed in sequence.
94 Performs the timing test using the same session ID; this can be used as a test
95 that session caching is working. If neither B<-new> nor B<-reuse> are
96 specified, they are both on by default and executed in sequence.
98 =item B<-ssl3>, B<-tls1>, B<-tls1_1>, B<-tls1_2>, B<-tls1_3>
100 These options enable specific SSL or TLS protocol versions for the handshake
101 initiated by this command.
102 By default, it negotiates the highest mutually supported protocol
104 Note that not all protocols and flags may be available, depending on how
109 There are several known bugs in SSL and TLS implementations. Adding this
110 option enables various workarounds.
112 =item B<-cipher> I<cipherlist>
114 This allows the TLSv1.2 and below cipher list sent by the client to be modified.
115 This list will be combined with any TLSv1.3 ciphersuites that have been
116 configured. Although the server determines which cipher suite is used it should
117 take the first supported cipher in the list sent by the client. See
118 L<openssl-ciphers(1)> for more information.
120 =item B<-ciphersuites> I<val>
122 This allows the TLSv1.3 ciphersuites sent by the client to be modified. This
123 list will be combined with any TLSv1.2 and below ciphersuites that have been
124 configured. Although the server determines which cipher suite is used it should
125 take the first supported cipher in the list sent by the client. See
126 L<openssl-ciphers(1)> for more information. The format for this list is a
127 simple colon (":") separated list of TLSv1.3 ciphersuite names.
129 =item B<-time> I<length>
131 Specifies how long (in seconds) this command should establish connections
132 and optionally transfer payload data from a server. Server and client
133 performance and the link speed determine how many connections it
136 {- $OpenSSL::safe::opt_trust_item -}
142 This command can be used to measure the performance of an SSL connection.
143 To connect to an SSL HTTP server and get the default page the command
145 openssl s_time -connect servername:443 -www / -CApath yourdir -CAfile yourfile.pem -cipher commoncipher [-ssl3]
147 would typically be used (https uses port 443). I<commoncipher> is a cipher to
148 which both client and server can agree, see the L<openssl-ciphers(1)> command
151 If the handshake fails then there are several possible causes, if it is
152 nothing obvious like no client certificate then the B<-bugs> and
153 B<-ssl3> options can be tried
154 in case it is a buggy server. In particular you should play with these
155 options B<before> submitting a bug report to an OpenSSL mailing list.
157 A frequent problem when attempting to get client certificates working
158 is that a web client complains it has no certificates or gives an empty
159 list to choose from. This is normally because the server is not sending
160 the clients certificate authority in its "acceptable CA list" when it
161 requests a certificate. By using L<openssl-s_client(1)> the CA list can be
162 viewed and checked. However some servers only request client authentication
163 after a specific URL is requested. To obtain the list in this case it
164 is necessary to use the B<-prexit> option of L<openssl-s_client(1)> and
165 send an HTTP request for an appropriate page.
167 If a certificate is specified on the command line using the B<-cert>
168 option it will not be used unless the server specifically requests
169 a client certificate. Therefor merely including a client certificate
170 on the command line is no guarantee that the certificate works.
174 Because this program does not have all the options of the
175 L<openssl-s_client(1)> program to turn protocols on and off, you may not
176 be able to measure the performance of all protocols with all servers.
178 The B<-verify> option should really exit if the server verification
184 L<openssl-s_client(1)>,
185 L<openssl-s_server(1)>,
186 L<openssl-ciphers(1)>,
187 L<ossl_store-file(7)>
191 Copyright 2004-2019 The OpenSSL Project Authors. All Rights Reserved.
193 Licensed under the Apache License 2.0 (the "License"). You may not use
194 this file except in compliance with the License. You can obtain a copy
195 in the file LICENSE in the source distribution or at
196 L<https://www.openssl.org/source/license.html>.