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NetBSD 6.1.5 - man page for openssl_s_server (netbsd section 1)

S_SERVER(1)				     OpenSSL				      S_SERVER(1)

NAME
       s_server - SSL/TLS server program

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
       openssl s_server [-accept port] [-context id] [-verify depth] [-Verify depth] [-crl_check]
       [-crl_check_all] [-cert filename] [-certform DER|PEM] [-key keyfile] [-keyform DER|PEM]
       [-pass arg] [-dcert filename] [-dcertform DER|PEM] [-dkey keyfile] [-dkeyform DER|PEM]
       [-dpass arg] [-dhparam filename] [-nbio] [-nbio_test] [-crlf] [-debug] [-msg] [-state]
       [-CApath directory] [-CAfile filename] [-nocert] [-cipher cipherlist] [-serverpref]
       [-quiet] [-no_tmp_rsa] [-ssl2] [-ssl3] [-tls1] [-no_ssl2] [-no_ssl3] [-no_tls1] [-no_dhe]
       [-no_ecdhe] [-bugs] [-hack] [-www] [-WWW] [-HTTP] [-engine id] [-tlsextdebug] [-no_ticket]
       [-id_prefix arg] [-rand file(s)] [-status] [-status_verbose] [-status_timeout nsec]
       [-status_url url] [-nextprotoneg protocols]

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 public key type: for example the DSS
	   cipher suites require a certificate containing a DSS (DSA) key. If not specified then
	   the filename "server.pem" will be used.

       -certform format
	   The certificate format to use: DER or PEM. PEM is the default.

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

       -keyform format
	   The private format to use: DER or PEM. PEM is the default.

       -pass arg
	   the private key password source. For more information about the format of arg see the
	   PASS PHRASE ARGUMENTS section in openssl(1).

       -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
	   certificate 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.

       -dcertform format, -dkeyform format, -dpass arg
	   additional certificate and private key format and passphrase respectively.

       -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 generate 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 effectively disabling the
	   ephemeral DH cipher suites.

       -no_ecdhe
	   if this option is set then no ECDH parameters will be loaded effectively disabling the
	   ephemeral ECDH 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.

	   If the ciphersuite cannot request a client certificate (for example an anonymous
	   ciphersuite or PSK) this option has no effect.

       -crl_check, -crl_check_all
	   Check the peer certificate has not been revoked by its CA.  The CRL(s) are appended to
	   the certificate file. With the -crl_check_all option all CRLs of all CAs in the chain
	   are checked.

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

       -CAfile file
	   A file containing trusted certificates to use during client authentication 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.

       -psk_hint hint
	   Use the PSK identity hint hint when using a PSK cipher suite.

       -psk key
	   Use the PSK key key when using a PSK cipher suite. The key is given as a hexadecimal
	   number without leading 0x, for example -psk 1a2b3c4d.

       -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 compatible 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 Netscape 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.

       -serverpref
	   use the server's cipher preferences, rather than the client's preferences.

       -tlsextdebug
	   print out a hex dump of any TLS extensions received from the server.

       -no_ticket
	   disable RFC4507bis session ticket support.

       -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
	   correct HTTP response (lines that are part of the HTTP response line and headers must
	   end with CRLF).

       -engine id
	   specifying an engine (by its 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 number generator, or an
	   EGD socket (see RAND_egd(3)).  Multiple files can be specified separated by a OS-
	   dependent character.  The separator is ; for MS-Windows, , for OpenVMS, and : for all
	   others.

       -status
	   enables certificate status request support (aka OCSP stapling).

       -status_verbose
	   enables certificate status request support (aka OCSP stapling) and gives a verbose
	   printout of the OCSP response.

       -status_timeout nsec
	   sets the timeout for OCSP response to nsec seconds.

       -status_url url
	   sets a fallback responder URL to use if no responder URL is present in the server
	   certificate. Without this option an error is returned if the server certificate does
	   not contain a responder address.

       -nextprotoneg protocols
	   enable Next Protocol Negotiation TLS extension and provide a comma-separated list of
	   supported protocol names.  The list should contain most wanted protocols first.
	   Protocol names are printable ASCII strings, for example "http/1.1" or "spdy/3".

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 special 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 certificate carrying an RSA key or a
       version of OpenSSL with RSA disabled.

       Although specifying an empty list of CAs when requesting a client certificate is strictly
       speaking a protocol violation, some SSL clients interpret this to mean any CA is
       acceptable. This is useful for debugging 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
       openssl_sess_id(1), openssl_s_client(1), openssl_ciphers(1)

1.0.1i					    2014-08-10				      S_SERVER(1)


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