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.
Print out a usage message.
This specifies the host and optional port to connect to.
This specifies the page to GET from the server. A value of '/' gets the index.htm 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.
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.
The private key to use. If not specified then the certificate file will be used. The file is in PEM format.
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.
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
-nameoptswitch may be used more than once to set multiple options. See the x509 manual page for details. -CApathdirectory
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.
A file containing trusted certificates to use during server authentication and to use when attempting to build the client certificate chain.
Do not load the trusted CA certificates from the default file location
Do not load the trusted CA certificates from the default directory location
performs the timing test using a new session ID for each connection. If neither
-newnor -reuseare 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
-newnor -reuseare 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 openssl_s_client 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
Note that this option may not be available, depending on how OpenSSL was built.
There are several known bugs in SSL and TLS implementations. Adding this option enables various workarounds.
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 for more information.
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 for more information. The format for this list is a simple colon (:) separated list of TLSv1.3 ciphersuite names.
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.
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 command for details.
If the handshake fails then there are several possible causes, if it is
nothing obvious like no client certificate then the
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 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
If a certificate is specified on the command line using the
Because this program does not have all the options of the s_client program to turn protocols on and off, you may not be able to measure the performance of all protocols with all servers.
Copyright 2016-2019 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 here: OpenSSL.
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