s_time

S_TIME(1SSL) OpenSSL S_TIME(1SSL)

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. Therefor 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)

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>.

1.1.1f 2023-10-10 S_TIME(1SSL)

s_time

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