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>]
26 [B<-cipher> I<cipherlist>]
27 [B<-ciphersuites> I<val>]
28 {- $OpenSSL::safe::opt_name_synopsis -}
30 {- $OpenSSL::safe::opt_trust_synopsis -}
31 {- $OpenSSL::safe::opt_provider_synopsis -}
33 =for openssl ifdef ssl3 tls1 tls1_1 tls1_2 tls1_3
37 This command implements a generic SSL/TLS client which
38 connects to a remote host using SSL/TLS. It can request a page from the server
39 and includes the time to transfer the payload data in its timing measurements.
40 It measures the number of connections within a given timeframe, the amount of
41 data transferred (if any), and calculates the average time spent for one
50 Print out a usage message.
52 =item B<-connect> I<host>:I<port>
54 This specifies the host and optional port to connect to.
58 This specifies the page to GET from the server. A value of '/' gets the
59 F<index.html> page. If this parameter is not specified, then this command
60 will only perform the handshake to establish SSL connections but not transfer
63 =item B<-cert> I<certname>
65 The certificate to use, if one is requested by the server. The default is
66 not to use a certificate. The file is in PEM format.
68 =item B<-key> I<keyfile>
70 The private key to use. If not specified then the certificate file will
71 be used. The file is in PEM format.
73 =item B<-verify> I<depth>
75 The verify depth to use. This specifies the maximum length of the
76 server certificate chain and turns on server certificate verification.
77 Currently the verify operation continues after errors so all the problems
78 with a certificate chain can be seen. As a side effect the connection
79 will never fail due to a server certificate verify failure.
83 Performs the timing test using a new session ID for each connection.
84 If neither B<-new> nor B<-reuse> are specified, they are both on by default
85 and executed in sequence.
89 Performs the timing test using the same session ID; this can be used as a test
90 that session caching is working. If neither B<-new> nor B<-reuse> are
91 specified, they are both on by default and executed in sequence.
95 There are several known bugs in SSL and TLS implementations. Adding this
96 option enables various workarounds.
98 =item B<-cipher> I<cipherlist>
100 This allows the TLSv1.2 and below cipher list sent by the client to be modified.
101 This list will be combined with any TLSv1.3 ciphersuites that have been
102 configured. Although the server determines which cipher suite is used it should
103 take the first supported cipher in the list sent by the client. See
104 L<openssl-ciphers(1)> for more information.
106 =item B<-ciphersuites> I<val>
108 This allows the TLSv1.3 ciphersuites sent by the client to be modified. This
109 list will be combined with any TLSv1.2 and below ciphersuites that have been
110 configured. Although the server determines which cipher suite is used it should
111 take the first supported cipher in the list sent by the client. See
112 L<openssl-ciphers(1)> for more information. The format for this list is a
113 simple colon (":") separated list of TLSv1.3 ciphersuite names.
115 =item B<-time> I<length>
117 Specifies how long (in seconds) this command should establish connections
118 and optionally transfer payload data from a server. Server and client
119 performance and the link speed determine how many connections it
122 {- $OpenSSL::safe::opt_name_item -}
124 {- $OpenSSL::safe::opt_trust_item -}
126 {- $OpenSSL::safe::opt_provider_item -}
128 =item B<-cafile> I<file>
130 This is an obsolete synonym for B<-CAfile>.
132 =item B<-ssl3>, B<-tls1>, B<-tls1_1>, B<-tls1_2>, B<-tls1_3>
134 See L<openssl(1)/TLS Version Options>.
140 This command can be used to measure the performance of an SSL connection.
141 To connect to an SSL HTTP server and get the default page the command
143 openssl s_time -connect servername:443 -www / -CApath yourdir -CAfile yourfile.pem -cipher commoncipher [-ssl3]
145 would typically be used (https uses port 443). I<commoncipher> is a cipher to
146 which both client and server can agree, see the L<openssl-ciphers(1)> command
149 If the handshake fails then there are several possible causes, if it is
150 nothing obvious like no client certificate then the B<-bugs> and
151 B<-ssl3> options can be tried
152 in case it is a buggy server. In particular you should play with these
153 options B<before> submitting a bug report to an OpenSSL mailing list.
155 A frequent problem when attempting to get client certificates working
156 is that a web client complains it has no certificates or gives an empty
157 list to choose from. This is normally because the server is not sending
158 the clients certificate authority in its "acceptable CA list" when it
159 requests a certificate. By using L<openssl-s_client(1)> the CA list can be
160 viewed and checked. However some servers only request client authentication
161 after a specific URL is requested. To obtain the list in this case it
162 is necessary to use the B<-prexit> option of L<openssl-s_client(1)> and
163 send an HTTP request for an appropriate page.
165 If a certificate is specified on the command line using the B<-cert>
166 option it will not be used unless the server specifically requests
167 a client certificate. Therefor merely including a client certificate
168 on the command line is no guarantee that the certificate works.
172 Because this program does not have all the options of the
173 L<openssl-s_client(1)> program to turn protocols on and off, you may not
174 be able to measure the performance of all protocols with all servers.
176 The B<-verify> option should really exit if the server verification
181 The B<-cafile> option was deprecated in OpenSSL 3.0.
186 L<openssl-s_client(1)>,
187 L<openssl-s_server(1)>,
188 L<openssl-ciphers(1)>,
189 L<ossl_store-file(7)>
193 Copyright 2004-2019 The OpenSSL Project Authors. All Rights Reserved.
195 Licensed under the Apache License 2.0 (the "License"). You may not use
196 this file except in compliance with the License. You can obtain a copy
197 in the file LICENSE in the source distribution or at
198 L<https://www.openssl.org/source/license.html>.