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s_time(1)                           OpenSSL                          s_time(1)




NAME

       openssl-s_time, s_time - SSL/TLS performance timing program


SYNOPSIS

       openssl s_time [-help] [-connect host:port] [-www page] [-cert
       filename] [-key filename] [-CApath directory] [-CAfile filename]
       [-no-CAfile] [-no-CApath] [-reuse] [-new] [-verify depth] [-nameopt
       option] [-time seconds] [-ssl3] [-bugs] [-cipher cipherlist]
       [-ciphersuites val]


DESCRIPTION

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


OPTIONS

       -help
           Print out a usage message.

       -connect host:port
           This specifies the host and optional port to connect to.

       -www page
           This specifies the page to GET from the server. A value of '/' gets
           the index.htm[l] page. If this parameter is not specified, then
           s_time will only perform the handshake to establish SSL connections
           but not transfer any payload data.

       -cert certname
           The certificate to use, if one is requested by the server. The
           default is not to use a certificate. The file is in PEM format.

       -key keyfile
           The private key to use. If not specified then the certificate file
           will be used. The file is in PEM format.

       -verify depth
           The verify depth to use. This specifies the maximum length of the
           server certificate chain and turns on server certificate
           verification.  Currently the verify operation continues after
           errors so all the problems with a certificate chain can be seen. As
           a side effect the connection will never fail due to a server
           certificate verify failure.

       -nameopt option
           Option which determines how the subject or issuer names are
           displayed. The option argument can be a single option or multiple
           options separated by commas.  Alternatively the -nameopt switch may
           be used more than once to set multiple options. See the x509(1)
           manual page for details.

       -CApath directory
           The directory to use for server certificate verification. This
           directory must be in "hash format", see verify for more
           information. These are also used when building the client
           certificate chain.

       -CAfile file
           A file containing trusted certificates to use during server
           authentication and to use when attempting to build the client
           certificate chain.

       -no-CAfile
           Do not load the trusted CA certificates from the default file
           location

       -no-CApath
           Do not load the trusted CA certificates from the default directory
           location

       -new
           Performs the timing test using a new session ID for each
           connection.  If neither -new nor -reuse are specified, they are
           both on by default and executed in sequence.

       -reuse
           Performs the timing test using the same session ID; this can be
           used as a test that session caching is working. If neither -new nor
           -reuse are specified, they are both on by default and executed in
           sequence.

       -ssl3
           This option disables the use of SSL version 3. By default the
           initial handshake uses a method which should be compatible with all
           servers and permit them to use SSL v3 or TLS as appropriate.

           The timing program is not as rich in options to turn protocols on
           and off as the s_client(1) program and may not connect to all
           servers.  Unfortunately there are a lot of ancient and broken
           servers in use which cannot handle this technique and will fail to
           connect. Some servers only work if TLS is turned off with the -ssl3
           option.

           Note that this option may not be available, depending on how
           OpenSSL was built.

       -bugs
           There are several known bugs in SSL and TLS implementations. Adding
           this option enables various workarounds.

       -cipher cipherlist
           This allows the TLSv1.2 and below cipher list sent by the client to
           be modified.  This list will be combined with any TLSv1.3
           ciphersuites that have been configured. Although the server
           determines which cipher suite is used it should take the first
           supported cipher in the list sent by the client. See ciphers(1) for
           more information.

       -ciphersuites val
           This allows the TLSv1.3 ciphersuites sent by the client to be
           modified. This list will be combined with any TLSv1.2 and below
           ciphersuites that have been configured. Although the server
           determines which cipher suite is used it should take the first
           supported cipher in the list sent by the client. See ciphers(1) for
           more information. The format for this list is a simple colon (":")
           separated list of TLSv1.3 ciphersuite names.

       -time length
           Specifies how long (in seconds) s_time should establish connections
           and optionally transfer payload data from a server. Server and
           client performance and the link speed determine how many
           connections s_time can establish.


NOTES

       s_time can be used to measure the performance of an SSL connection.  To
       connect to an SSL HTTP server and get the default page the command

        openssl s_time -connect servername:443 -www / -CApath yourdir -CAfile yourfile.pem -cipher commoncipher [-ssl3]

       would typically be used (https uses port 443). 'commoncipher' is a
       cipher to which both client and server can agree, see the ciphers(1)
       command for details.

       If the handshake fails then there are several possible causes, if it is
       nothing obvious like no client certificate then the -bugs and -ssl3
       options can be tried in case it is a buggy server. In particular you
       should play with these options before submitting a bug report to an
       OpenSSL mailing list.

       A frequent problem when attempting to get client certificates working
       is that a web client complains it has no certificates or gives an empty
       list to choose from. This is normally because the server is not sending
       the clients certificate authority in its "acceptable CA list" when it
       requests a certificate. By using s_client(1) the CA list can be viewed
       and checked. However, some servers only request client authentication
       after a specific URL is requested. To obtain the list in this case it
       is necessary to use the -prexit option of s_client(1) and send an HTTP
       request for an appropriate page.

       If a certificate is specified on the command line using the -cert
       option it will not be used unless the server specifically requests a
       client certificate. Therefore, merely including a client certificate on
       the command line is no guarantee that the certificate works.


BUGS

       Because this program does not have all the options of the s_client(1)
       program to turn protocols on and off, you may not be able to measure
       the performance of all protocols with all servers.

       The -verify option should really exit if the server verification fails.


SEE ALSO

       s_client(1), s_server(1), ciphers(1)


COPYRIGHT

       Copyright 2004-2020 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.



1.1.1h                            2020-09-22                         s_time(1)

openssl 1.1.1h - Generated Tue Sep 29 09:10:42 CDT 2020
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