1OPENSSL-S_TIME(1ossl)               OpenSSL              OPENSSL-S_TIME(1ossl)
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NAME

6       openssl-s_time - SSL/TLS performance timing program
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SYNOPSIS

9       openssl s_time [-help] [-connect host:port] [-www page] [-cert
10       filename] [-key filename] [-reuse] [-new] [-verify depth] [-time
11       seconds] [-ssl3] [-tls1] [-tls1_1] [-tls1_2] [-tls1_3] [-bugs] [-cipher
12       cipherlist] [-ciphersuites val] [-nameopt option] [-cafile file]
13       [-CAfile file] [-no-CAfile] [-CApath dir] [-no-CApath] [-CAstore uri]
14       [-no-CAstore] [-provider name] [-provider-path path] [-propquery propq]
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DESCRIPTION

17       This command implements a generic SSL/TLS client which connects to a
18       remote host using SSL/TLS. It can request a page from the server and
19       includes the time to transfer the payload data in its timing
20       measurements.  It measures the number of connections within a given
21       timeframe, the amount of data transferred (if any), and calculates the
22       average time spent for one connection.
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OPTIONS

25       -help
26           Print out a usage message.
27
28       -connect host:port
29           This specifies the host and optional port to connect to.
30
31       -www page
32           This specifies the page to GET from the server. A value of '/' gets
33           the index.html page. If this parameter is not specified, then this
34           command will only perform the handshake to establish SSL
35           connections but not transfer any payload data.
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37       -cert certname
38           The certificate to use, if one is requested by the server. The
39           default is not to use a certificate. The file is in PEM format.
40
41       -key keyfile
42           The private key to use. If not specified then the certificate file
43           will be used. The file is in PEM format.
44
45       -verify depth
46           The verify depth to use. This specifies the maximum length of the
47           server certificate chain and turns on server certificate
48           verification.  Currently the verify operation continues after
49           errors so all the problems with a certificate chain can be seen. As
50           a side effect the connection will never fail due to a server
51           certificate verify failure.
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53       -new
54           Performs the timing test using a new session ID for each
55           connection.  If neither -new nor -reuse are specified, they are
56           both on by default and executed in sequence.
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58       -reuse
59           Performs the timing test using the same session ID; this can be
60           used as a test that session caching is working. If neither -new nor
61           -reuse are specified, they are both on by default and executed in
62           sequence.
63
64       -bugs
65           There are several known bugs in SSL and TLS implementations. Adding
66           this option enables various workarounds.
67
68       -cipher cipherlist
69           This allows the TLSv1.2 and below cipher list sent by the client to
70           be modified.  This list will be combined with any TLSv1.3
71           ciphersuites that have been configured. Although the server
72           determines which cipher suite is used it should take the first
73           supported cipher in the list sent by the client. See
74           openssl-ciphers(1) for more information.
75
76       -ciphersuites val
77           This allows the TLSv1.3 ciphersuites sent by the client to be
78           modified. This list will be combined with any TLSv1.2 and below
79           ciphersuites that have been configured. Although the server
80           determines which cipher suite is used it should take the first
81           supported cipher in the list sent by the client. See
82           openssl-ciphers(1) for more information. The format for this list
83           is a simple colon (":") separated list of TLSv1.3 ciphersuite
84           names.
85
86       -time length
87           Specifies how long (in seconds) this command should establish
88           connections and optionally transfer payload data from a server.
89           Server and client performance and the link speed determine how many
90           connections it can establish.
91
92       -nameopt option
93           This specifies how the subject or issuer names are displayed.  See
94           openssl-namedisplay-options(1) for details.
95
96       -CAfile file, -no-CAfile, -CApath dir, -no-CApath, -CAstore uri,
97       -no-CAstore
98           See "Trusted Certificate Options" in
99           openssl-verification-options(1) for details.
100
101       -provider name
102       -provider-path path
103       -propquery propq
104           See "Provider Options" in openssl(1), provider(7), and property(7).
105
106       -cafile file
107           This is an obsolete synonym for -CAfile.
108
109       -ssl3, -tls1, -tls1_1, -tls1_2, -tls1_3
110           See "TLS Version Options" in openssl(1).
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NOTES

113       This command can be used to measure the performance of an SSL
114       connection.  To connect to an SSL HTTP server and get the default page
115       the command
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117        openssl s_time -connect servername:443 -www / -CApath yourdir -CAfile yourfile.pem -cipher commoncipher [-ssl3]
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119       would typically be used (https uses port 443). commoncipher is a cipher
120       to which both client and server can agree, see the openssl-ciphers(1)
121       command for details.
122
123       If the handshake fails then there are several possible causes, if it is
124       nothing obvious like no client certificate then the -bugs and -ssl3
125       options can be tried in case it is a buggy server. In particular you
126       should play with these options before submitting a bug report to an
127       OpenSSL mailing list.
128
129       A frequent problem when attempting to get client certificates working
130       is that a web client complains it has no certificates or gives an empty
131       list to choose from. This is normally because the server is not sending
132       the clients certificate authority in its "acceptable CA list" when it
133       requests a certificate. By using openssl-s_client(1) the CA list can be
134       viewed and checked. However, some servers only request client
135       authentication after a specific URL is requested. To obtain the list in
136       this case it is necessary to use the -prexit option of
137       openssl-s_client(1) and send an HTTP request for an appropriate page.
138
139       If a certificate is specified on the command line using the -cert
140       option it will not be used unless the server specifically requests a
141       client certificate. Therefore, merely including a client certificate on
142       the command line is no guarantee that the certificate works.
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BUGS

145       Because this program does not have all the options of the
146       openssl-s_client(1) program to turn protocols on and off, you may not
147       be able to measure the performance of all protocols with all servers.
148
149       The -verify option should really exit if the server verification fails.
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HISTORY

152       The -cafile option was deprecated in OpenSSL 3.0.
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SEE ALSO

155       openssl(1), openssl-s_client(1), openssl-s_server(1),
156       openssl-ciphers(1), ossl_store-file(7)
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159       Copyright 2004-2021 The OpenSSL Project Authors. All Rights Reserved.
160
161       Licensed under the Apache License 2.0 (the "License").  You may not use
162       this file except in compliance with the License.  You can obtain a copy
163       in the file LICENSE in the source distribution or at
164       <https://www.openssl.org/source/license.html>.
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1683.0.9                             2023-07-27             OPENSSL-S_TIME(1ossl)
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