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           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] [-trusted_first]
           [-krb5svc service] [-keytab filename] [-nocert] [-cipher cipherlist]
           [-quiet] [-no_tmp_rsa] [-ssl2] [-ssl3] [-tls1] [-tls1_1] [-tls1_2]
           [-dtls1] [-no_ssl2] [-no_ssl3] [-no_tls1] [-no_tls1_1] [-no_tls1_2]
           [-no_dhe] [-no_ecdhe] [-bugs] [-hack] [-www] [-WWW] [-HTTP] [-engine
           id] [-tlsextdebug] [-no_ticket] [-id_prefix arg] [-rand file(s)]
           [-nextprotoneg protocols]


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


           -accept port
               the TCP port to listen on for connections. If not specified 4433 is
           -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
               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.
               if this option is set then no DH parameters will be loaded
               effectively disabling the ephemeral DH cipher suites.
               if this option is set then ephemeral ECDH cipher suites will be
               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.
           -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.
               Use certificates in CA file or CA directory before other
               certificates when building the trust chain to verify client
               certificates.  This is mainly useful in environments with Bridge CA
               or Cross-Certified CAs.
           -krb5svc service
               show all protocol messages with hex dump.
               tests non blocking I/O
               turns on non blocking I/O
               this option translated a line feed from the terminal into CR+LF.
               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
           -ssl2, -ssl3, -tls1, -tls1_1, -tls1_2, -dtls1, -no_ssl2, -no_ssl3,
           -no_tls1, -no_tls1_1, -no_tls1_2
               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.
               there are several known bug in SSL and TLS implementations. Adding
               this option enables various workarounds.
               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.
               print out a hex dump of any TLS extensions received from the
               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.
           -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".


           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.
           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.


           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.


           sess_id(1), s_client(1), ciphers(1)

    1.0.1e 2017-03-22 S_SERVER(1)


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