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OPENSSL-S_SERVER(1ossl)             OpenSSL            OPENSSL-S_SERVER(1ossl)



NAME

       openssl-s_server - SSL/TLS server program


SYNOPSIS

       openssl s_server [-help] [-port +int] [-accept val] [-unix val] [-4]
       [-6] [-unlink] [-context val] [-verify int] [-Verify int] [-cert
       infile] [-cert2 infile] [-certform DER|PEM|P12] [-cert_chain infile]
       [-build_chain] [-serverinfo val] [-key filename|uri] [-key2
       filename|uri] [-keyform DER|PEM|P12|ENGINE] [-pass val] [-dcert infile]
       [-dcertform DER|PEM|P12] [-dcert_chain infile] [-dkey filename|uri]
       [-dkeyform DER|PEM|P12|ENGINE] [-dpass val] [-nbio_test] [-crlf]
       [-debug] [-msg] [-msgfile outfile] [-state] [-nocert] [-quiet]
       [-no_resume_ephemeral] [-www] [-WWW] [-http_server_binmode]
       [-no_ca_names] [-ignore_unexpected_eof] [-servername]
       [-servername_fatal] [-tlsextdebug] [-HTTP] [-id_prefix val]
       [-keymatexport val] [-keymatexportlen +int] [-CRL infile] [-CRLform
       DER|PEM] [-crl_download] [-chainCAfile infile] [-chainCApath dir]
       [-chainCAstore uri] [-verifyCAfile infile] [-verifyCApath dir]
       [-verifyCAstore uri] [-no_cache] [-ext_cache] [-verify_return_error]
       [-verify_quiet] [-ign_eof] [-no_ign_eof] [-no_etm] [-no_ems] [-status]
       [-status_verbose] [-status_timeout int] [-proxy
       [http[s]://][userinfo@]host[:port][/path]] [-no_proxy addresses]
       [-status_url val] [-status_file infile] [-ssl_config val] [-trace]
       [-security_debug] [-security_debug_verbose] [-brief] [-rev] [-async]
       [-max_send_frag +int] [-split_send_frag +int] [-max_pipelines +int]
       [-naccept +int] [-read_buf +int] [-bugs] [-no_tx_cert_comp]
       [-no_rx_cert_comp] [-no_comp] [-comp] [-no_ticket] [-serverpref]
       [-legacy_renegotiation] [-no_renegotiation] [-no_resumption_on_reneg]
       [-allow_no_dhe_kex] [-prioritize_chacha] [-strict] [-sigalgs val]
       [-client_sigalgs val] [-groups val] [-curves val] [-named_curve val]
       [-cipher val] [-ciphersuites val] [-dhparam infile] [-record_padding
       val] [-debug_broken_protocol] [-nbio] [-psk_identity val] [-psk_hint
       val] [-psk val] [-psk_session file] [-srpvfile infile] [-srpuserseed
       val] [-timeout] [-mtu +int] [-listen] [-sctp] [-sctp_label_bug]
       [-use_srtp val] [-no_dhe] [-nextprotoneg val] [-alpn val] [-ktls]
       [-sendfile] [-zerocopy_sendfile] [-keylogfile outfile]
       [-recv_max_early_data int] [-max_early_data int] [-early_data]
       [-stateless] [-anti_replay] [-no_anti_replay] [-num_tickets] [-tfo]
       [-cert_comp] [-nameopt option] [-no_ssl3] [-no_tls1] [-no_tls1_1]
       [-no_tls1_2] [-no_tls1_3] [-ssl3] [-tls1] [-tls1_1] [-tls1_2] [-tls1_3]
       [-dtls] [-dtls1] [-dtls1_2] [-allow_proxy_certs] [-attime timestamp]
       [-no_check_time] [-check_ss_sig] [-crl_check] [-crl_check_all]
       [-explicit_policy] [-extended_crl] [-ignore_critical] [-inhibit_any]
       [-inhibit_map] [-partial_chain] [-policy arg] [-policy_check]
       [-policy_print] [-purpose purpose] [-suiteB_128] [-suiteB_128_only]
       [-suiteB_192] [-trusted_first] [-no_alt_chains] [-use_deltas]
       [-auth_level num] [-verify_depth num] [-verify_email email]
       [-verify_hostname hostname] [-verify_ip ip] [-verify_name name]
       [-x509_strict] [-issuer_checks] [-bugs] [-no_comp] [-comp] [-no_ticket]
       [-serverpref] [-client_renegotiation] [-legacy_renegotiation]
       [-no_renegotiation] [-no_resumption_on_reneg] [-legacy_server_connect]
       [-no_legacy_server_connect] [-no_etm] [-allow_no_dhe_kex]
       [-prioritize_chacha] [-strict] [-sigalgs algs] [-client_sigalgs algs]
       [-groups groups] [-curves curves] [-named_curve curve] [-cipher
       ciphers] [-ciphersuites 1.3ciphers] [-min_protocol minprot]
       [-max_protocol maxprot] [-record_padding padding]
       [-debug_broken_protocol] [-no_middlebox] [-xkey infile] [-xcert file]
       [-xchain file] [-xchain_build file] [-xcertform DER|PEM]> [-xkeyform
       DER|PEM]> [-CAfile file] [-no-CAfile] [-CApath dir] [-no-CApath]
       [-CAstore uri] [-no-CAstore] [-rand files] [-writerand file] [-engine
       id] [-provider name] [-provider-path path] [-propquery propq]
       [-enable_server_rpk] [-enable_client_rpk]


DESCRIPTION

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


OPTIONS

       In addition to the options below, this command also supports the common
       and server only options documented "Supported Command Line Commands" in
       SSL_CONF_cmd(3)

       -help
           Print out a usage message.

       -port +int
           The TCP port to listen on for connections. If not specified 4433 is
           used.

       -accept val
           The optional TCP host and port to listen on for connections. If not
           specified, *:4433 is used.

       -unix val
           Unix domain socket to accept on.

       -4  Use IPv4 only.

       -6  Use IPv6 only.

       -unlink
           For -unix, unlink any existing socket first.

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

       -verify int, -Verify int
           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 cipher suite cannot request a client certificate (for
           example an anonymous cipher suite or PSK) this option has no
           effect.

       -cert infile
           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.

       -cert2 infile
           The certificate file to use for servername; default is
           "server2.pem".

       -certform DER|PEM|P12
           The server certificate file format; unspecified by default.  See
           openssl-format-options(1) for details.

       -cert_chain
           A file or URI of untrusted certificates to use when attempting to
           build the certificate chain related to the certificate specified
           via the -cert option.  The input can be in PEM, DER, or PKCS#12
           format.

       -build_chain
           Specify whether the application should build the server certificate
           chain to be provided to the client.

       -serverinfo val
           A file containing one or more blocks of PEM data.  Each PEM block
           must encode a TLS ServerHello extension (2 bytes type, 2 bytes
           length, followed by "length" bytes of extension data).  If the
           client sends an empty TLS ClientHello extension matching the type,
           the corresponding ServerHello extension will be returned.

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

       -key2 filename|uri
           The private Key file to use for servername if not given via -cert2.

       -keyform DER|PEM|P12|ENGINE
           The key format; unspecified by default.  See
           openssl-format-options(1) for details.

       -pass val
           The private key and certificate file password source.  For more
           information about the format of val, see
           openssl-passphrase-options(1).

       -dcert infile, -dkey filename|uri
           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.

       -dcert_chain
           A file or URI of untrusted certificates to use when attempting to
           build the server certificate chain when a certificate specified via
           the -dcert option is in use.  The input can be in PEM, DER, or
           PKCS#12 format.

       -dcertform DER|PEM|P12
           The format of the additional certificate file; unspecified by
           default.  See openssl-format-options(1) for details.

       -dkeyform DER|PEM|P12|ENGINE
           The format of the additional private key; unspecified by default.
           See openssl-format-options(1) for details.

       -dpass val
           The passphrase for the additional private key and certificate.  For
           more information about the format of val, see
           openssl-passphrase-options(1).

       -nbio_test
           Tests non blocking I/O.

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

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

       -security_debug
           Print output from SSL/TLS security framework.

       -security_debug_verbose
           Print more output from SSL/TLS security framework

       -msg
           Show all protocol messages with hex dump.

       -msgfile outfile
           File to send output of -msg or -trace to, default standard output.

       -state
           Prints the SSL session states.

       -CRL infile
           The CRL file to use.

       -CRLform DER|PEM
           The CRL file format; unspecified by default.  See
           openssl-format-options(1) for details.

       -crl_download
           Download CRLs from distribution points given in CDP extensions of
           certificates

       -verifyCAfile filename
           A file in PEM format CA containing trusted certificates to use for
           verifying client certificates.

       -verifyCApath dir
           A directory containing trusted certificates to use for verifying
           client certificates.  This directory must be in "hash format", see
           openssl-verify(1) for more information.

       -verifyCAstore uri
           The URI of a store containing trusted certificates to use for
           verifying client certificates.

       -chainCAfile file
           A file in PEM format containing trusted certificates to use when
           attempting to build the server certificate chain.

       -chainCApath dir
           A directory containing trusted certificates to use for building the
           server certificate chain provided to the client.  This directory
           must be in "hash format", see openssl-verify(1) for more
           information.

       -chainCAstore uri
           The URI of a store containing trusted certificates to use for
           building the server certificate chain provided to the client.  The
           URI may indicate a single certificate, as well as a collection of
           them.  With URIs in the "file:" scheme, this acts as -chainCAfile
           or -chainCApath, depending on if the URI indicates a directory or a
           single file.  See ossl_store-file(7) for more information on the
           "file:" scheme.

       -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).

       -quiet
           Inhibit printing of session and certificate information.

       -no_resume_ephemeral
           Disable caching and tickets if ephemeral (EC)DH is used.

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

       -www
           Sends a status message back to the client when it connects. This
           includes information about the ciphers used and various session
           parameters.  The output is in HTML format so this option can be
           used with a web browser.  The special URL "/renegcert" turns on
           client cert validation, and "/reneg" tells the server to request
           renegotiation.  The -early_data option cannot be used with this
           option.

       -WWW, -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 sent.  If the -HTTP flag is used, the files are sent directly,
           and should contain any HTTP response headers (including status
           response line).  If the -WWW option is used, the response headers
           are generated by the server, and the file extension is examined to
           determine the Content-Type header.  Extensions of "html", "htm",
           and "php" are "text/html" and all others are "text/plain".  In
           addition, the special URL "/stats" will return status information
           like the -www option.  Neither of these options can be used in
           conjunction with -early_data.

       -http_server_binmode
           When acting as web-server (using option -WWW or -HTTP) open files
           requested by the client in binary mode.

       -no_ca_names
           Disable TLS Extension CA Names. You may want to disable it for
           security reasons or for compatibility with some Windows TLS
           implementations crashing when this extension is larger than 1024
           bytes.

       -ignore_unexpected_eof
           Some TLS implementations do not send the mandatory close_notify
           alert on shutdown. If the application tries to wait for the
           close_notify alert but the peer closes the connection without
           sending it, an error is generated. When this option is enabled the
           peer does not need to send the close_notify alert and a closed
           connection will be treated as if the close_notify alert was
           received.  For more information on shutting down a connection, see
           SSL_shutdown(3).

       -servername
           Servername for HostName TLS extension.

       -servername_fatal
           On servername mismatch send fatal alert (default: warning alert).

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

       -keymatexport
           Export keying material using label.

       -keymatexportlen
           Export the given number of bytes of keying material; default 20.

       -no_cache
           Disable session cache.

       -ext_cache.
           Disable internal cache, set up and use external cache.

       -verify_return_error
           Verification errors normally just print a message but allow the
           connection to continue, for debugging purposes.  If this option is
           used, then verification errors close the connection.

       -verify_quiet
           No verify output except verify errors.

       -ign_eof
           Ignore input EOF (default: when -quiet).

       -no_ign_eof
           Do not ignore input EOF.

       -no_etm
           Disable Encrypt-then-MAC negotiation.

       -no_ems
           Disable Extended master secret negotiation.

       -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 int
           Sets the timeout for OCSP response to int seconds.

       -proxy [http[s]://][userinfo@]host[:port][/path]
           The HTTP(S) proxy server to use for reaching the OCSP server unless
           -no_proxy applies, see below.  The proxy port defaults to 80 or 443
           if the scheme is "https"; apart from that the optional "http://" or
           "https://" prefix is ignored, as well as any userinfo and path
           components.  Defaults to the environment variable "http_proxy" if
           set, else "HTTP_PROXY" in case no TLS is used, otherwise
           "https_proxy" if set, else "HTTPS_PROXY".

       -no_proxy addresses
           List of IP addresses and/or DNS names of servers not to use an
           HTTP(S) proxy for, separated by commas and/or whitespace (where in
           the latter case the whole argument must be enclosed in "...").
           Default is from the environment variable "no_proxy" if set, else
           "NO_PROXY".

       -status_url val
           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.
           The optional userinfo and fragment URL components are ignored.  Any
           given query component is handled as part of the path component.

       -status_file infile
           Overrides any OCSP responder URLs from the certificate and always
           provides the OCSP Response stored in the file. The file must be in
           DER format.

       -ssl_config val
           Configure SSL_CTX using the given configuration value.

       -trace
           Show verbose trace output of protocol messages.

       -brief
           Provide a brief summary of connection parameters instead of the
           normal verbose output.

       -rev
           Simple echo server that sends back received text reversed. Also
           sets -brief.  Cannot be used in conjunction with -early_data.

       -async
           Switch on asynchronous mode. Cryptographic operations will be
           performed asynchronously. This will only have an effect if an
           asynchronous capable engine is also used via the -engine option.
           For test purposes the dummy async engine (dasync) can be used (if
           available).

       -max_send_frag +int
           The maximum size of data fragment to send.  See
           SSL_CTX_set_max_send_fragment(3) for further information.

       -split_send_frag +int
           The size used to split data for encrypt pipelines. If more data is
           written in one go than this value then it will be split into
           multiple pipelines, up to the maximum number of pipelines defined
           by max_pipelines. This only has an effect if a suitable cipher
           suite has been negotiated, an engine that supports pipelining has
           been loaded, and max_pipelines is greater than 1. See
           SSL_CTX_set_split_send_fragment(3) for further information.

       -max_pipelines +int
           The maximum number of encrypt/decrypt pipelines to be used. This
           will only have an effect if an engine has been loaded that supports
           pipelining (e.g. the dasync engine) and a suitable cipher suite has
           been negotiated. The default value is 1.  See
           SSL_CTX_set_max_pipelines(3) for further information.

       -naccept +int
           The server will exit after receiving the specified number of
           connections, default unlimited.

       -read_buf +int
           The default read buffer size to be used for connections. This will
           only have an effect if the buffer size is larger than the size that
           would otherwise be used and pipelining is in use (see
           SSL_CTX_set_default_read_buffer_len(3) for further information).

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

       -no_tx_cert_comp
           Disables support for sending TLSv1.3 compressed certificates.

       -no_rx_cert_comp
           Disables support for receiving TLSv1.3 compressed certificates.

       -no_comp
           Disable negotiation of TLS compression.  TLS compression is not
           recommended and is off by default as of OpenSSL 1.1.0.

       -comp
           Enable negotiation of TLS compression.  This option was introduced
           in OpenSSL 1.1.0.  TLS compression is not recommended and is off by
           default as of OpenSSL 1.1.0.

       -no_ticket
           Disable RFC4507bis session ticket support. This option has no
           effect if TLSv1.3 is negotiated. See -num_tickets.

       -num_tickets
           Control the number of tickets that will be sent to the client after
           a full handshake in TLSv1.3. The default number of tickets is 2.
           This option does not affect the number of tickets sent after a
           resumption handshake.

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

       -prioritize_chacha
           Prioritize ChaCha ciphers when preferred by clients. Requires
           -serverpref.

       -no_resumption_on_reneg
           Set the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION option.

       -client_sigalgs val
           Signature algorithms to support for client certificate
           authentication (colon-separated list).

       -named_curve val
           Specifies the elliptic curve to use. NOTE: this is single curve,
           not a list.  For a list of all possible curves, use:

               $ openssl ecparam -list_curves

       -cipher val
           This allows the list of TLSv1.2 and below ciphersuites used by the
           server to be modified. This list is combined with any TLSv1.3
           ciphersuites that have been configured. 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 is irrelevant.
           See openssl-ciphers(1) for more information.

       -ciphersuites val
           This allows the list of TLSv1.3 ciphersuites used by the server to
           be modified.  This list is combined with any TLSv1.2 and below
           ciphersuites that have been configured. 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 is irrelevant.
           See openssl-ciphers(1) command for more information. The format for
           this list is a simple colon (":") separated list of TLSv1.3
           ciphersuite names.

       -dhparam infile
           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 this command will be used.

       -nbio
           Turns on non blocking I/O.

       -timeout
           Enable timeouts.

       -mtu
           Set link-layer MTU.

       -psk_identity val
           Expect the client to send PSK identity val when using a PSK cipher
           suite, and warn if they do not.  By default, the expected PSK
           identity is the string "Client_identity".

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

       -psk val
           Use the PSK key val when using a PSK cipher suite. The key is given
           as a hexadecimal number without leading 0x, for example -psk
           1a2b3c4d.  This option must be provided in order to use a PSK
           cipher.

       -psk_session file
           Use the pem encoded SSL_SESSION data stored in file as the basis of
           a PSK. Note that this will only work if TLSv1.3 is negotiated.

       -srpvfile
           The verifier file for SRP. This option is deprecated.

       -srpuserseed
           A seed string for a default user salt.  This option is deprecated.

       -listen
           This option can only be used in conjunction with one of the DTLS
           options above.  With this option, this command will listen on a UDP
           port for incoming connections.  Any ClientHellos that arrive will
           be checked to see if they have a cookie in them or not.  Any
           without a cookie will be responded to with a HelloVerifyRequest.
           If a ClientHello with a cookie is received then this command will
           connect to that peer and complete the handshake.

       -sctp
           Use SCTP for the transport protocol instead of UDP in DTLS. Must be
           used in conjunction with -dtls, -dtls1 or -dtls1_2. This option is
           only available where OpenSSL has support for SCTP enabled.

       -sctp_label_bug
           Use the incorrect behaviour of older OpenSSL implementations when
           computing endpoint-pair shared secrets for DTLS/SCTP. This allows
           communication with older broken implementations but breaks
           interoperability with correct implementations. Must be used in
           conjunction with -sctp. This option is only available where OpenSSL
           has support for SCTP enabled.

       -use_srtp
           Offer SRTP key management with a colon-separated profile list.

       -no_dhe
           If this option is set then no DH parameters will be loaded
           effectively disabling the ephemeral DH cipher suites.

       -alpn val, -nextprotoneg val
           These flags enable the Application-Layer Protocol Negotiation or
           Next Protocol Negotiation (NPN) extension, respectively. ALPN is
           the IETF standard and replaces NPN. The val list is a comma-
           separated list of supported protocol names.  The list should
           contain the most desirable protocols first.  Protocol names are
           printable ASCII strings, for example "http/1.1" or "spdy/3".  The
           flag -nextprotoneg cannot be specified if -tls1_3 is used.

       -ktls
           Enable Kernel TLS for sending and receiving.  This option was
           introduced in OpenSSL 3.2.0.  Kernel TLS is off by default as of
           OpenSSL 3.2.0.

       -sendfile
           If this option is set and KTLS is enabled, SSL_sendfile() will be
           used instead of BIO_write() to send the HTTP response requested by
           a client.  This option is only valid when -ktls along with -WWW or
           -HTTP are specified.

       -zerocopy_sendfile
           If this option is set, SSL_sendfile() will use the zerocopy TX
           mode, which gives a performance boost when used with KTLS hardware
           offload. Note that invalid TLS records might be transmitted if the
           file is changed while being sent.  This option depends on
           -sendfile; when used alone, -sendfile is implied, and a warning is
           shown. Note that KTLS sendfile on FreeBSD always runs in the
           zerocopy mode.

       -keylogfile outfile
           Appends TLS secrets to the specified keylog file such that external
           programs (like Wireshark) can decrypt TLS connections.

       -max_early_data int
           Change the default maximum early data bytes that are specified for
           new sessions and any incoming early data (when used in conjunction
           with the -early_data flag). The default value is approximately 16k.
           The argument must be an integer greater than or equal to 0.

       -recv_max_early_data int
           Specify the hard limit on the maximum number of early data bytes
           that will be accepted.

       -early_data
           Accept early data where possible. Cannot be used in conjunction
           with -www, -WWW, -HTTP or -rev.

       -stateless
           Require TLSv1.3 cookies.

       -anti_replay, -no_anti_replay
           Switches replay protection on or off, respectively. Replay
           protection is on by default unless overridden by a configuration
           file. When it is on, OpenSSL will automatically detect if a session
           ticket has been used more than once, TLSv1.3 has been negotiated,
           and early data is enabled on the server. A full handshake is forced
           if a session ticket is used a second or subsequent time. Any early
           data that was sent will be rejected.

       -tfo
           Enable acceptance of TCP Fast Open (RFC7413) connections.

       -cert_comp
           Pre-compresses certificates (RFC8879) that will be sent during the
           handshake.

       -nameopt option
           This specifies how the subject or issuer names are displayed.  See
           openssl-namedisplay-options(1) for details.

       -no_ssl3, -no_tls1, -no_tls1_1, -no_tls1_2, -no_tls1_3, -ssl3, -tls1,
       -tls1_1, -tls1_2, -tls1_3
           See "TLS Version Options" in openssl(1).

       -dtls, -dtls1, -dtls1_2
           These specify the use of DTLS instead of TLS. See "TLS Version
           Options" in openssl(1).

       -bugs, -comp, -no_comp, -no_ticket, -serverpref, -client_renegotiation,
       -legacy_renegotiation, -no_renegotiation, -no_resumption_on_reneg,
       -legacy_server_connect, -no_legacy_server_connect, -no_etm
       -allow_no_dhe_kex, -prioritize_chacha, -strict, -sigalgs algs,
       -client_sigalgs algs, -groups groups, -curves curves, -named_curve
       curve, -cipher ciphers, -ciphersuites 1.3ciphers, -min_protocol
       minprot, -max_protocol maxprot, -record_padding padding,
       -debug_broken_protocol, -no_middlebox
           See "SUPPORTED COMMAND LINE COMMANDS" in SSL_CONF_cmd(3) for
           details.

       -xkey infile, -xcert file, -xchain file, -xchain_build file, -xcertform
       DER|PEM, -xkeyform DER|PEM
           Set extended certificate verification options.  See "Extended
           Verification Options" in openssl-verification-options(1) for
           details.

       -CAfile file, -no-CAfile, -CApath dir, -no-CApath, -CAstore uri,
       -no-CAstore
           See "Trusted Certificate Options" in
           openssl-verification-options(1) for details.

       -rand files, -writerand file
           See "Random State Options" in openssl(1) for details.

       -engine id
           See "Engine Options" in openssl(1).  This option is deprecated.

       -provider name
       -provider-path path
       -propquery propq
           See "Provider Options" in openssl(1), provider(7), and property(7).

       -allow_proxy_certs, -attime, -no_check_time, -check_ss_sig, -crl_check,
       -crl_check_all, -explicit_policy, -extended_crl, -ignore_critical,
       -inhibit_any, -inhibit_map, -no_alt_chains, -partial_chain, -policy,
       -policy_check, -policy_print, -purpose, -suiteB_128, -suiteB_128_only,
       -suiteB_192, -trusted_first, -use_deltas, -auth_level, -verify_depth,
       -verify_email, -verify_hostname, -verify_ip, -verify_name, -x509_strict
       -issuer_checks
           Set various options of certificate chain verification.  See
           "Verification Options" in openssl-verification-options(1) for
           details.

           If the server requests a client certificate, then verification
           errors are displayed, for debugging, but the command will proceed
           unless the -verify_return_error option is used.

       -enable_server_rpk
           Enable support for sending raw public keys (RFC7250) to the client.
           A raw public key will be sent by the server, if solicited by the
           client, provided a suitable key and public certificate pair is
           configured.  Clients that don't support raw public keys or prefer
           to use X.509 certificates can still elect to receive X.509
           certificates as usual.

           Raw public keys are extracted from the configured
           certificate/private key.

       -enable_client_rpk
           Enable support for receiving raw public keys (RFC7250) from the
           client.  Use of X.509 certificates by the client becomes optional,
           and clients that support raw public keys may elect to use them.
           Clients that don't support raw public keys or prefer to use X.509
           certificates can still elect to send X.509 certificates as usual.

           Raw public keys are extracted from the configured
           certificate/private key.


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 commands are also recognized which perform special operations.
       These commands are a letter which must appear at the start of a line.
       They 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 (TLSv1.2 and below only).

       R   Renegotiate the SSL session and request a client certificate
           (TLSv1.2 and below only).

       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.

       k   Send a key update message to the client (TLSv1.3 only)

       K   Send a key update message to the client and request one back
           (TLSv1.3 only)

       c   Send a certificate request to the client (TLSv1.3 only)


NOTES

       This command 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.

       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 openssl-sess_id(1)
       command.


BUGS

       Because this program has a lot of options and also because some of the
       techniques used are rather old, the C source for this command 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 this command to print out details of any
       unknown cipher suites a client says it supports.


SEE ALSO

       openssl(1), openssl-sess_id(1), openssl-s_client(1),
       openssl-ciphers(1), SSL_CONF_cmd(3), SSL_CTX_set_max_send_fragment(3),
       SSL_CTX_set_split_send_fragment(3), SSL_CTX_set_max_pipelines(3),
       ossl_store-file(7)


HISTORY

       The -no_alt_chains option was added in OpenSSL 1.1.0.

       The -allow-no-dhe-kex and -prioritize_chacha options were added in
       OpenSSL 1.1.1.

       The -srpvfile, -srpuserseed, and -engine option were deprecated in
       OpenSSL 3.0.

       The -enable_client_rpk, -enable_server_rpk, -no_rx_cert_comp,
       -no_tx_cert_comp, and -tfo options were added in OpenSSL 3.2.


COPYRIGHT

       Copyright 2000-2023 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

3.2.0                             2023-11-23           OPENSSL-S_SERVER(1ossl)

openssl 3.2.0 - Generated Wed Nov 29 08:05:48 CST 2023
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