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>.

3.0.13                                             2025-02-05                               OPENSSL-S_TIME(1SSL)