Manual Pages for UNIX Operating System command usage for man s_time

OpenSSL                                          S_TIME(1openssl)



NNNNAAAAMMMMEEEE
     s_time - SSL/TLS performance timing program

SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
     ooooppppeeeennnnssssssssllll ssss_ttttiiiimmmmeeee [---cccoooonnnnnnnneeeecccctttt hhhhoooosssstttt::::ppppoooorrrrtttt] [---wwwwwww ppppaaaaggggeeee] [---ccceeeerrrrtttt
     ffffiiiilllleeeennnnaaaammmmeeee] [---kkkeeeeyyyy ffffiiiilllleeeennnnaaaammmmeeee] [---CCCAAAAppppaaaatttthhhh ddddiiiirrrreeeeccccttttoooorrrryyyy] [---CCCAAAAffffiiiilllleeee
     ffffiiiilllleeeennnnaaaammmmeeee] [---rrreeeeuuuusssseeee] [---nnneeeewwww] [---vvveeeerrrriiiiffffyyyy ddddeeeepppptttthhhh] [---nnnbbbbiiiioooo] [---tttiiiimmmmeeee
     sssseeeeccccoooonnnnddddssss] [---sssssssllll2222] [---sssssssllll3333] [---bbbuuuuggggssss] [---ccciiiipppphhhheeeerrrr cccciiiipppphhhheeeerrrrlllliiiisssstttt]

DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
     The ssss_cccclllliiiieeeennnntttt 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.

OOOOPPPPTTTTIIIIOOOONNNNSSSS
     -ccccoooonnnnnnnneeeecccctttt hhhhoooosssstttt::::ppppoooorrrrtttt
         This specifies the host and optional port to connect to.

     -wwwwwwww ppppaaaaggggeeee
         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 ssss_ttttiiiimmmmeeee will only perform the
         handshake to establish SSL connections but not transfer
         any payload data.

     -cccceeeerrrrtttt cccceeeerrrrttttnnnnaaaammmmeeee
         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.

     -kkkkeeeeyyyy kkkkeeeeyyyyffffiiiilllleeee
         The private key to use. If not specified then the
         certificate file will be used. The file is in PEM
         format.

     -vvvveeeerrrriiiiffffyyyy ddddeeeepppptttthhhh
         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.

     -CCCCAAAAppppaaaatttthhhh ddddiiiirrrreeeeccccttttoooorrrryyyy
         The directory to use for server certificate
         verification. This directory must be in "hash format",
         see vvvveeeerrrriiiiffffyyyy for more information. These are also used



7/Jan/2004             Last change: 0.9.8o                      1






OpenSSL                                          S_TIME(1openssl)



         when building the client certificate chain.

     -CCCCAAAAffffiiiilllleeee ffffiiiilllleeee
         A file containing trusted certificates to use during
         server authentication and to use when attempting to
         build the client certificate chain.

     -nnnneeeewwww
         performs the timing test using a new session ID for each
         connection.  If neither ---nnneeeewwww nor ---rrreeeeuuuusssseeee are specified,
         they are both on by default and executed in sequence.

     -rrrreeeeuuuusssseeee
         performs the timing test using the same session ID; this
         can be used as a test that session caching is working.
         If neither ---nnneeeewwww nor ---rrreeeeuuuusssseeee are specified, they are both
         on by default and executed in sequence.

     -nnnnbbbbiiiioooo
         turns on non-blocking I/O.

     -ssssssssllll2222, -ssssssssllll3333
         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 ---sssssssllll3333 option; others will only
         support SSL v2 and may need the ---sssssssllll2222 option.

     -bbbbuuuuggggssss
         there are several known bug in SSL and TLS
         implementations. Adding this option enables various
         workarounds.

     -cccciiiipppphhhheeeerrrr cccciiiipppphhhheeeerrrrlllliiiisssstttt
         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.

     -ttttiiiimmmmeeee lllleeeennnnggggtttthhhh
         specifies how long (in seconds) ssss_ttttiiiimmmmeeee should establish
         connections and optionally transfer payload data from a
         server. Server and client performance and the link speed



7/Jan/2004             Last change: 0.9.8o                      2






OpenSSL                                          S_TIME(1openssl)



         determine how many connections ssss_ttttiiiimmmmeeee can establish.

NNNNOOOOTTTTEEEESSSS
     ssss_cccclllliiiieeeennnntttt 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 ---bbbuuuuggggssss, ---sssssssllll2222, ---sssssssllll3333 options can be tried in case it
     is a buggy server. In particular you should play with these
     options bbbbeeeeffffoooorrrreeee 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
     ---ppprrrreeeexxxxiiiitttt 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
     ---ccceeeerrrrtttt 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.

BBBBUUUUGGGGSSSS
     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 ---vvveeeerrrriiiiffffyyyy option should really exit if the server
     verification fails.

SSSSEEEEEEEE AAAALLLLSSSSOOOO
     s_client(1), s_server(1), ciphers(1)






7/Jan/2004             Last change: 0.9.8o                      3






OpenSSL                                          S_TIME(1openssl)























































7/Jan/2004             Last change: 0.9.8o                      4