/xlv3/openssl/0.9.7e-sgipl1/work/0.9.7e-sgipl1/openssl-
0.9.7e/doc/apps
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NAME
s_time - SSL/TLS performance timing program
SYNOPSIS
openssl s_time [-connect host:port] [-www page] [-cert
filename] [-key filename] [-CApath directory] [-CAfile
filename] [-reuse] [-new] [-verify depth] [-nbio] [-time
seconds] [-ssl2] [-ssl3] [-bugs] [-cipher cipherlist]
DESCRIPTION
The s_client 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
-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.
-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
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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.
-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.
-nbio
turns on non-blocking I/O.
-ssl2, -ssl3
these options disable the use of certain SSL or TLS
protocols. By default the initial handshake uses a
method which should be compatible with all servers and
permit them to use SSL v3, SSL v2 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; others will only
support SSL v2 and may need the -ssl2 option.
-bugs
there are several known bug in SSL and TLS
implementations. 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
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determine how many connections s_time can establish.
NOTES
s_client 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, -ssl2, -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)
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