NAME

       openssl-s_time - SSL/TLS performance timing program

SYNOPSIS

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

DESCRIPTION

       This 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.html
           page. If this parameter is not specified, then this command 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.

       -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.

       -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 openssl-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 openssl-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) this command should establish connections and
           optionally transfer payload data from a server. Server and client performance and the
           link speed determine how many connections it can establish.

       -nameopt option
           This specifies how the subject or issuer names are displayed.  See
           openssl-namedisplay-options(1) for details.

       -CAfile file, -no-CAfile, -CApath dir, -no-CApath, -CAstore uri, -no-CAstore
           See "Trusted Certificate Options" in openssl-verification-options(1) for details.

       -provider name
       -provider-path path
       -propquery propq
           See "Provider Options" in openssl(1), provider(7), and property(7).

       -cafile file
           This is an obsolete synonym for -CAfile.

       -ssl3, -tls1, -tls1_1, -tls1_2, -tls1_3
           See "TLS Version Options" in openssl(1).

NOTES

       This command 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 openssl-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 openssl-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 openssl-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 openssl-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.

HISTORY

       The -cafile option was deprecated in OpenSSL 3.0.

SEE ALSO

       openssl(1), openssl-s_client(1), openssl-s_server(1), openssl-ciphers(1),
       ossl_store-file(7)

COPYRIGHT

       Copyright 2004-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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>.