s_server man page on OpenDarwin

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S_SERVER(1)			    OpenSSL			   S_SERVER(1)

NAME
       s_server - SSL/TLS server program

SYNOPSIS
       openssl s_server [-accept port] [-context id] [-verify depth] [-Verify
       depth] [-cert filename] [-key keyfile] [-dcert filename] [-dkey key‐
       file] [-dhparam filename] [-nbio] [-nbio_test] [-crlf] [-debug] [-msg]
       [-state] [-CApath directory] [-CAfile filename] [-nocert] [-cipher
       cipherlist] [-quiet] [-no_tmp_rsa] [-ssl2] [-ssl3] [-tls1] [-no_ssl2]
       [-no_ssl3] [-no_tls1] [-no_dhe] [-bugs] [-hack] [-www] [-WWW] [-HTTP]
       [-engine id] [-id_prefix arg] [-rand file(s)]

DESCRIPTION
       The s_server command implements a generic SSL/TLS server which listens
       for connections on a given port using SSL/TLS.

OPTIONS
       -accept port
	   the TCP port to listen on for connections. If not specified 4433 is
	   used.

       -context id
	   sets the SSL context id. It can be given any string value. If this
	   option is not present a default value will be used.

       -cert certname
	   The certificate to use, most servers cipher suites require the use
	   of a certificate and some require a certificate with a certain pub‐
	   lic key type: for example the DSS cipher suites require a certifi‐
	   cate containing a DSS (DSA) key. If not specified then the filename
	   "server.pem" will be used.

       -key keyfile
	   The private key to use. If not specified then the certificate file
	   will be used.

       -dcert filename, -dkey keyname
	   specify an additional certificate and private key, these behave in
	   the same manner as the -cert and -key options except there is no
	   default if they are not specified (no additional certificate and
	   key is used). As noted above some cipher suites require a certifi‐
	   cate containing a key of a certain type. Some cipher suites need a
	   certificate carrying an RSA key and some a DSS (DSA) key. By using
	   RSA and DSS certificates and keys a server can support clients
	   which only support RSA or DSS cipher suites by using an appropriate
	   certificate.

       -nocert
	   if this option is set then no certificate is used. This restricts
	   the cipher suites available to the anonymous ones (currently just
	   anonymous DH).

       -dhparam filename
	   the DH parameter file to use. The ephemeral DH cipher suites gener‐
	   ate keys using a set of DH parameters. If not specified then an
	   attempt is made to load the parameters from the server certificate
	   file. If this fails then a static set of parameters hard coded into
	   the s_server program will be used.

       -no_dhe
	   if this option is set then no DH parameters will be loaded effec‐
	   tively disabling the ephemeral DH cipher suites.

       -no_tmp_rsa
	   certain export cipher suites sometimes use a temporary RSA key,
	   this option disables temporary RSA key generation.

       -verify depth, -Verify depth
	   The verify depth to use. This specifies the maximum length of the
	   client certificate chain and makes the server request a certificate
	   from the client. With the -verify option a certificate is requested
	   but the client does not have to send one, with the -Verify option
	   the client must supply a certificate or an error occurs.

       -CApath directory
	   The directory to use for client certificate verification. This
	   directory must be in "hash format", see verify for more informa‐
	   tion. These are also used when building the server certificate
	   chain.

       -CAfile file
	   A file containing trusted certificates to use during client authen‐
	   tication and to use when attempting to build the server certificate
	   chain. The list is also used in the list of acceptable client CAs
	   passed to the client when a certificate is requested.

       -state
	   prints out the SSL session states.

       -debug
	   print extensive debugging information including a hex dump of all
	   traffic.

       -msg
	   show all protocol messages with hex dump.

       -nbio_test
	   tests non blocking I/O

       -nbio
	   turns on non blocking I/O

       -crlf
	   this option translated a line feed from the terminal into CR+LF.

       -quiet
	   inhibit printing of session and certificate information.

       -ssl2, -ssl3, -tls1, -no_ssl2, -no_ssl3, -no_tls1
	   these options disable the use of certain SSL or TLS protocols. By
	   default the initial handshake uses a method which should be compat‐
	   ible with all servers and permit them to use SSL v3, SSL v2 or TLS
	   as appropriate.

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

       -hack
	   this option enables a further workaround for some some early Net‐
	   scape SSL code (?).

       -cipher cipherlist
	   this allows the cipher list used by the server to be modified.
	   When the client sends a list of supported ciphers the first client
	   cipher also included in the server list is used. Because the client
	   specifies the preference order, the order of the server cipherlist
	   irrelevant. See the ciphers command for more information.

       -www
	   sends a status message back to the client when it connects. This
	   includes lots of information about the ciphers used and various
	   session parameters.	The output is in HTML format so this option
	   will normally be used with a web browser.

       -WWW
	   emulates a simple web server. Pages will be resolved relative to
	   the current directory, for example if the URL
	   https://myhost/page.html is requested the file ./page.html will be
	   loaded.

       -HTTP
	   emulates a simple web server. Pages will be resolved relative to
	   the current directory, for example if the URL
	   https://myhost/page.html is requested the file ./page.html will be
	   loaded. The files loaded are assumed to contain a complete and cor‐
	   rect HTTP response (lines that are part of the HTTP response line
	   and headers must end with CRLF).

       -engine id
	   specifying an engine (by it's unique id string) will cause s_server
	   to attempt to obtain a functional reference to the specified
	   engine, thus initialising it if needed. The engine will then be set
	   as the default for all available algorithms.

       -id_prefix arg
	   generate SSL/TLS session IDs prefixed by arg. This is mostly useful
	   for testing any SSL/TLS code (eg. proxies) that wish to deal with
	   multiple servers, when each of which might be generating a unique
	   range of session IDs (eg. with a certain prefix).

       -rand file(s)
	   a file or files containing random data used to seed the random num‐
	   ber generator, or an EGD socket (see RAND_egd(3)).  Multiple files
	   can be specified separated by a OS-dependent character.  The sepa‐
	   rator is ; for MS-Windows, , for OpenVMS, and : for all others.

CONNECTED COMMANDS
       If a connection request is established with an SSL client and neither
       the -www nor the -WWW option has been used then normally any data
       received from the client is displayed and any key presses will be sent
       to the client.

       Certain single letter commands are also recognized which perform spe‐
       cial operations: these are listed below.

       q   end the current SSL connection but still accept new connections.

       Q   end the current SSL connection and exit.

       r   renegotiate the SSL session.

       R   renegotiate the SSL session and request a client certificate.

       P   send some plain text down the underlying TCP connection: this
	   should cause the client to disconnect due to a protocol violation.

       S   print out some session cache status information.

NOTES
       s_server can be used to debug SSL clients. To accept connections from a
       web browser the command:

	openssl s_server -accept 443 -www

       can be used for example.

       Most web browsers (in particular Netscape and MSIE) only support RSA
       cipher suites, so they cannot connect to servers which don't use a cer‐
       tificate carrying an RSA key or a version of OpenSSL with RSA disabled.

       Although specifying an empty list of CAs when requesting a client cer‐
       tificate is strictly speaking a protocol violation, some SSL clients
       interpret this to mean any CA is acceptable. This is useful for debug‐
       ging purposes.

       The session parameters can printed out using the sess_id program.

BUGS
       Because this program has a lot of options and also because some of the
       techniques used are rather old, the C source of s_server is rather hard
       to read and not a model of how things should be done. A typical SSL
       server program would be much simpler.

       The output of common ciphers is wrong: it just gives the list of
       ciphers that OpenSSL recognizes and the client supports.

       There should be a way for the s_server program to print out details of
       any unknown cipher suites a client says it supports.

SEE ALSO
       sess_id(1), s_client(1), ciphers(1)

0.9.7d				  2003-11-20			   S_SERVER(1)
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