openssl-s_time (1)
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NAME
openssl-s_time, s_time - SSL/TLS performance timing programSYNOPSIS
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] [-nbio] [-time seconds] [-ssl3] [-bugs] [-cipher cipherlist]DESCRIPTION
The s_time command implements a genericOPTIONS
- -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 GETfrom 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 establishSSLconnections 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 PEMformat.
- -key keyfile
-
The private key to use. If not specified then the certificate file will
be used. The file is in PEMformat.
- -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.
- -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 CAcertificates from the default file location
- -no-CApath
-
Do not load the trusted CAcertificates from the default directory location
- -new
-
performs the timing test using a new session IDfor 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.
- -nbio
- turns on non-blocking I/O.
- -ssl3
-
these options disable the use of certain SSLorTLSprotocols. By default the initial handshake uses a method which should be compatible with all servers and permit them to useSSLv3 orTLSas 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
TLSis turned off with the -ssl3 option. - -bugs
-
there are several known bug in SSLandTLSimplementations. Adding this option enables various workarounds.
- -cipher cipherlist
- this allows the cipher list sent by the client to be modified. Although the server determines which cipher suite is used it should take the first supported cipher in the list sent by the client. See the ciphers(1) command for more information.
- -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
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
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)COPYRIGHT
Copyright 2004-2016 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