869 lines
34 KiB
Groff
869 lines
34 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "S_SERVER 1"
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.TH S_SERVER 1 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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openssl\-s_server, s_server \- SSL/TLS server program
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.SH "SYNOPSIS"
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|
.IX Header "SYNOPSIS"
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|
\&\fBopenssl\fR \fBs_server\fR
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[\fB\-help\fR]
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[\fB\-port +int\fR]
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[\fB\-accept val\fR]
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[\fB\-unix val\fR]
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|
[\fB\-4\fR]
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[\fB\-6\fR]
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|
[\fB\-unlink\fR]
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|
[\fB\-context val\fR]
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|
[\fB\-verify int\fR]
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[\fB\-Verify int\fR]
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|
[\fB\-cert infile\fR]
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|
[\fB\-nameopt val\fR]
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|
[\fB\-naccept +int\fR]
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|
[\fB\-serverinfo val\fR]
|
|
[\fB\-certform PEM|DER\fR]
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|
[\fB\-key infile\fR]
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|
[\fB\-keyform format\fR]
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|
[\fB\-pass val\fR]
|
|
[\fB\-dcert infile\fR]
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[\fB\-dcertform PEM|DER\fR]
|
|
[\fB\-dkey infile\fR]
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|
[\fB\-dkeyform PEM|DER\fR]
|
|
[\fB\-dpass val\fR]
|
|
[\fB\-nbio_test\fR]
|
|
[\fB\-crlf\fR]
|
|
[\fB\-debug\fR]
|
|
[\fB\-msg\fR]
|
|
[\fB\-msgfile outfile\fR]
|
|
[\fB\-state\fR]
|
|
[\fB\-CAfile infile\fR]
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|
[\fB\-CApath dir\fR]
|
|
[\fB\-no\-CAfile\fR]
|
|
[\fB\-no\-CApath\fR]
|
|
[\fB\-nocert\fR]
|
|
[\fB\-quiet\fR]
|
|
[\fB\-no_resume_ephemeral\fR]
|
|
[\fB\-www\fR]
|
|
[\fB\-WWW\fR]
|
|
[\fB\-servername\fR]
|
|
[\fB\-servername_fatal\fR]
|
|
[\fB\-cert2 infile\fR]
|
|
[\fB\-key2 infile\fR]
|
|
[\fB\-tlsextdebug\fR]
|
|
[\fB\-HTTP\fR]
|
|
[\fB\-id_prefix val\fR]
|
|
[\fB\-rand file...\fR]
|
|
[\fB\-writerand file\fR]
|
|
[\fB\-keymatexport val\fR]
|
|
[\fB\-keymatexportlen +int\fR]
|
|
[\fB\-CRL infile\fR]
|
|
[\fB\-crl_download\fR]
|
|
[\fB\-cert_chain infile\fR]
|
|
[\fB\-dcert_chain infile\fR]
|
|
[\fB\-chainCApath dir\fR]
|
|
[\fB\-verifyCApath dir\fR]
|
|
[\fB\-no_cache\fR]
|
|
[\fB\-ext_cache\fR]
|
|
[\fB\-CRLform PEM|DER\fR]
|
|
[\fB\-verify_return_error\fR]
|
|
[\fB\-verify_quiet\fR]
|
|
[\fB\-build_chain\fR]
|
|
[\fB\-chainCAfile infile\fR]
|
|
[\fB\-verifyCAfile infile\fR]
|
|
[\fB\-ign_eof\fR]
|
|
[\fB\-no_ign_eof\fR]
|
|
[\fB\-status\fR]
|
|
[\fB\-status_verbose\fR]
|
|
[\fB\-status_timeout int\fR]
|
|
[\fB\-status_url val\fR]
|
|
[\fB\-status_file infile\fR]
|
|
[\fB\-trace\fR]
|
|
[\fB\-security_debug\fR]
|
|
[\fB\-security_debug_verbose\fR]
|
|
[\fB\-brief\fR]
|
|
[\fB\-rev\fR]
|
|
[\fB\-async\fR]
|
|
[\fB\-ssl_config val\fR]
|
|
[\fB\-max_send_frag +int\fR]
|
|
[\fB\-split_send_frag +int\fR]
|
|
[\fB\-max_pipelines +int\fR]
|
|
[\fB\-read_buf +int\fR]
|
|
[\fB\-no_ssl3\fR]
|
|
[\fB\-no_tls1\fR]
|
|
[\fB\-no_tls1_1\fR]
|
|
[\fB\-no_tls1_2\fR]
|
|
[\fB\-no_tls1_3\fR]
|
|
[\fB\-bugs\fR]
|
|
[\fB\-no_comp\fR]
|
|
[\fB\-comp\fR]
|
|
[\fB\-no_ticket\fR]
|
|
[\fB\-num_tickets\fR]
|
|
[\fB\-serverpref\fR]
|
|
[\fB\-legacy_renegotiation\fR]
|
|
[\fB\-no_renegotiation\fR]
|
|
[\fB\-legacy_server_connect\fR]
|
|
[\fB\-no_resumption_on_reneg\fR]
|
|
[\fB\-no_legacy_server_connect\fR]
|
|
[\fB\-allow_no_dhe_kex\fR]
|
|
[\fB\-prioritize_chacha\fR]
|
|
[\fB\-strict\fR]
|
|
[\fB\-sigalgs val\fR]
|
|
[\fB\-client_sigalgs val\fR]
|
|
[\fB\-groups val\fR]
|
|
[\fB\-curves val\fR]
|
|
[\fB\-named_curve val\fR]
|
|
[\fB\-cipher val\fR]
|
|
[\fB\-ciphersuites val\fR]
|
|
[\fB\-dhparam infile\fR]
|
|
[\fB\-record_padding val\fR]
|
|
[\fB\-debug_broken_protocol\fR]
|
|
[\fB\-policy val\fR]
|
|
[\fB\-purpose val\fR]
|
|
[\fB\-verify_name val\fR]
|
|
[\fB\-verify_depth int\fR]
|
|
[\fB\-auth_level int\fR]
|
|
[\fB\-attime intmax\fR]
|
|
[\fB\-verify_hostname val\fR]
|
|
[\fB\-verify_email val\fR]
|
|
[\fB\-verify_ip\fR]
|
|
[\fB\-ignore_critical\fR]
|
|
[\fB\-issuer_checks\fR]
|
|
[\fB\-crl_check\fR]
|
|
[\fB\-crl_check_all\fR]
|
|
[\fB\-policy_check\fR]
|
|
[\fB\-explicit_policy\fR]
|
|
[\fB\-inhibit_any\fR]
|
|
[\fB\-inhibit_map\fR]
|
|
[\fB\-x509_strict\fR]
|
|
[\fB\-extended_crl\fR]
|
|
[\fB\-use_deltas\fR]
|
|
[\fB\-policy_print\fR]
|
|
[\fB\-check_ss_sig\fR]
|
|
[\fB\-trusted_first\fR]
|
|
[\fB\-suiteB_128_only\fR]
|
|
[\fB\-suiteB_128\fR]
|
|
[\fB\-suiteB_192\fR]
|
|
[\fB\-partial_chain\fR]
|
|
[\fB\-no_alt_chains\fR]
|
|
[\fB\-no_check_time\fR]
|
|
[\fB\-allow_proxy_certs\fR]
|
|
[\fB\-xkey\fR]
|
|
[\fB\-xcert\fR]
|
|
[\fB\-xchain\fR]
|
|
[\fB\-xchain_build\fR]
|
|
[\fB\-xcertform PEM|DER\fR]
|
|
[\fB\-xkeyform PEM|DER\fR]
|
|
[\fB\-nbio\fR]
|
|
[\fB\-psk_identity val\fR]
|
|
[\fB\-psk_hint val\fR]
|
|
[\fB\-psk val\fR]
|
|
[\fB\-psk_session file\fR]
|
|
[\fB\-srpvfile infile\fR]
|
|
[\fB\-srpuserseed val\fR]
|
|
[\fB\-ssl3\fR]
|
|
[\fB\-tls1\fR]
|
|
[\fB\-tls1_1\fR]
|
|
[\fB\-tls1_2\fR]
|
|
[\fB\-tls1_3\fR]
|
|
[\fB\-dtls\fR]
|
|
[\fB\-timeout\fR]
|
|
[\fB\-mtu +int\fR]
|
|
[\fB\-listen\fR]
|
|
[\fB\-dtls1\fR]
|
|
[\fB\-dtls1_2\fR]
|
|
[\fB\-sctp\fR]
|
|
[\fB\-sctp_label_bug\fR]
|
|
[\fB\-no_dhe\fR]
|
|
[\fB\-nextprotoneg val\fR]
|
|
[\fB\-use_srtp val\fR]
|
|
[\fB\-alpn val\fR]
|
|
[\fB\-engine val\fR]
|
|
[\fB\-keylogfile outfile\fR]
|
|
[\fB\-max_early_data int\fR]
|
|
[\fB\-early_data\fR]
|
|
[\fB\-anti_replay\fR]
|
|
[\fB\-no_anti_replay\fR]
|
|
.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
|
|
The \fBs_server\fR command implements a generic \s-1SSL/TLS\s0 server which listens
|
|
for connections on a given port using \s-1SSL/TLS.\s0
|
|
.SH "OPTIONS"
|
|
.IX Header "OPTIONS"
|
|
In addition to the options below the \fBs_server\fR utility also supports the
|
|
common and server only options documented
|
|
in the \*(L"Supported Command Line Commands\*(R" section of the \fBSSL_CONF_cmd\fR\|(3)
|
|
manual page.
|
|
.IP "\fB\-help\fR" 4
|
|
.IX Item "-help"
|
|
Print out a usage message.
|
|
.IP "\fB\-port +int\fR" 4
|
|
.IX Item "-port +int"
|
|
The \s-1TCP\s0 port to listen on for connections. If not specified 4433 is used.
|
|
.IP "\fB\-accept val\fR" 4
|
|
.IX Item "-accept val"
|
|
The optional \s-1TCP\s0 host and port to listen on for connections. If not specified, *:4433 is used.
|
|
.IP "\fB\-unix val\fR" 4
|
|
.IX Item "-unix val"
|
|
Unix domain socket to accept on.
|
|
.IP "\fB\-4\fR" 4
|
|
.IX Item "-4"
|
|
Use IPv4 only.
|
|
.IP "\fB\-6\fR" 4
|
|
.IX Item "-6"
|
|
Use IPv6 only.
|
|
.IP "\fB\-unlink\fR" 4
|
|
.IX Item "-unlink"
|
|
For \-unix, unlink any existing socket first.
|
|
.IP "\fB\-context val\fR" 4
|
|
.IX Item "-context val"
|
|
Sets the \s-1SSL\s0 context id. It can be given any string value. If this option
|
|
is not present a default value will be used.
|
|
.IP "\fB\-verify int\fR, \fB\-Verify int\fR" 4
|
|
.IX Item "-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 \fB\-verify\fR option a certificate is requested but the
|
|
client does not have to send one, with the \fB\-Verify\fR option the client
|
|
must supply a certificate or an error occurs.
|
|
.Sp
|
|
If the cipher suite cannot request a client certificate (for example an
|
|
anonymous cipher suite or \s-1PSK\s0) this option has no effect.
|
|
.IP "\fB\-cert infile\fR" 4
|
|
.IX Item "-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 \s-1DSS\s0 cipher suites require a certificate containing a \s-1DSS\s0
|
|
(\s-1DSA\s0) key. If not specified then the filename \*(L"server.pem\*(R" will be used.
|
|
.IP "\fB\-cert_chain\fR" 4
|
|
.IX Item "-cert_chain"
|
|
A file containing trusted certificates to use when attempting to build the
|
|
client/server certificate chain related to the certificate specified via the
|
|
\&\fB\-cert\fR option.
|
|
.IP "\fB\-build_chain\fR" 4
|
|
.IX Item "-build_chain"
|
|
Specify whether the application should build the certificate chain to be
|
|
provided to the client.
|
|
.IP "\fB\-nameopt val\fR" 4
|
|
.IX Item "-nameopt val"
|
|
Option which determines how the subject or issuer names are displayed. The
|
|
\&\fBval\fR argument can be a single option or multiple options separated by
|
|
commas. Alternatively the \fB\-nameopt\fR switch may be used more than once to
|
|
set multiple options. See the \fBx509\fR\|(1) manual page for details.
|
|
.IP "\fB\-naccept +int\fR" 4
|
|
.IX Item "-naccept +int"
|
|
The server will exit after receiving the specified number of connections,
|
|
default unlimited.
|
|
.IP "\fB\-serverinfo val\fR" 4
|
|
.IX Item "-serverinfo val"
|
|
A file containing one or more blocks of \s-1PEM\s0 data. Each \s-1PEM\s0 block
|
|
must encode a \s-1TLS\s0 ServerHello extension (2 bytes type, 2 bytes length,
|
|
followed by \*(L"length\*(R" bytes of extension data). If the client sends
|
|
an empty \s-1TLS\s0 ClientHello extension matching the type, the corresponding
|
|
ServerHello extension will be returned.
|
|
.IP "\fB\-certform PEM|DER\fR" 4
|
|
.IX Item "-certform PEM|DER"
|
|
The certificate format to use: \s-1DER\s0 or \s-1PEM. PEM\s0 is the default.
|
|
.IP "\fB\-key infile\fR" 4
|
|
.IX Item "-key infile"
|
|
The private key to use. If not specified then the certificate file will
|
|
be used.
|
|
.IP "\fB\-keyform format\fR" 4
|
|
.IX Item "-keyform format"
|
|
The private format to use: \s-1DER\s0 or \s-1PEM. PEM\s0 is the default.
|
|
.IP "\fB\-pass val\fR" 4
|
|
.IX Item "-pass val"
|
|
The private key password source. For more information about the format of \fBval\fR
|
|
see the \fB\s-1PASS PHRASE ARGUMENTS\s0\fR section in \fBopenssl\fR\|(1).
|
|
.IP "\fB\-dcert infile\fR, \fB\-dkey infile\fR" 4
|
|
.IX Item "-dcert infile, -dkey infile"
|
|
Specify an additional certificate and private key, these behave in the
|
|
same manner as the \fB\-cert\fR and \fB\-key\fR 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 \s-1RSA\s0 key
|
|
and some a \s-1DSS\s0 (\s-1DSA\s0) key. By using \s-1RSA\s0 and \s-1DSS\s0 certificates and keys
|
|
a server can support clients which only support \s-1RSA\s0 or \s-1DSS\s0 cipher suites
|
|
by using an appropriate certificate.
|
|
.IP "\fB\-dcert_chain\fR" 4
|
|
.IX Item "-dcert_chain"
|
|
A file containing trusted certificates to use when attempting to build the
|
|
server certificate chain when a certificate specified via the \fB\-dcert\fR option
|
|
is in use.
|
|
.IP "\fB\-dcertform PEM|DER\fR, \fB\-dkeyform PEM|DER\fR, \fB\-dpass val\fR" 4
|
|
.IX Item "-dcertform PEM|DER, -dkeyform PEM|DER, -dpass val"
|
|
Additional certificate and private key format and passphrase respectively.
|
|
.IP "\fB\-xkey infile\fR, \fB\-xcert infile\fR, \fB\-xchain\fR" 4
|
|
.IX Item "-xkey infile, -xcert infile, -xchain"
|
|
Specify an extra certificate, private key and certificate chain. These behave
|
|
in the same manner as the \fB\-cert\fR, \fB\-key\fR and \fB\-cert_chain\fR options. When
|
|
specified, the callback returning the first valid chain will be in use by
|
|
the server.
|
|
.IP "\fB\-xchain_build\fR" 4
|
|
.IX Item "-xchain_build"
|
|
Specify whether the application should build the certificate chain to be
|
|
provided to the client for the extra certificates provided via \fB\-xkey infile\fR,
|
|
\&\fB\-xcert infile\fR, \fB\-xchain\fR options.
|
|
.IP "\fB\-xcertform PEM|DER\fR, \fB\-xkeyform PEM|DER\fR" 4
|
|
.IX Item "-xcertform PEM|DER, -xkeyform PEM|DER"
|
|
Extra certificate and private key format respectively.
|
|
.IP "\fB\-nbio_test\fR" 4
|
|
.IX Item "-nbio_test"
|
|
Tests non blocking I/O.
|
|
.IP "\fB\-crlf\fR" 4
|
|
.IX Item "-crlf"
|
|
This option translated a line feed from the terminal into \s-1CR+LF.\s0
|
|
.IP "\fB\-debug\fR" 4
|
|
.IX Item "-debug"
|
|
Print extensive debugging information including a hex dump of all traffic.
|
|
.IP "\fB\-msg\fR" 4
|
|
.IX Item "-msg"
|
|
Show all protocol messages with hex dump.
|
|
.IP "\fB\-msgfile outfile\fR" 4
|
|
.IX Item "-msgfile outfile"
|
|
File to send output of \fB\-msg\fR or \fB\-trace\fR to, default standard output.
|
|
.IP "\fB\-state\fR" 4
|
|
.IX Item "-state"
|
|
Prints the \s-1SSL\s0 session states.
|
|
.IP "\fB\-CAfile infile\fR" 4
|
|
.IX Item "-CAfile infile"
|
|
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.
|
|
.IP "\fB\-CApath dir\fR" 4
|
|
.IX Item "-CApath dir"
|
|
The directory to use for client certificate verification. This directory
|
|
must be in \*(L"hash format\*(R", see \fBverify\fR\|(1) for more information. These are
|
|
also used when building the server certificate chain.
|
|
.IP "\fB\-chainCApath dir\fR" 4
|
|
.IX Item "-chainCApath dir"
|
|
The directory to use for building the chain provided to the client. This
|
|
directory must be in \*(L"hash format\*(R", see \fBverify\fR\|(1) for more information.
|
|
.IP "\fB\-chainCAfile file\fR" 4
|
|
.IX Item "-chainCAfile file"
|
|
A file containing trusted certificates to use when attempting to build the
|
|
server certificate chain.
|
|
.IP "\fB\-no\-CAfile\fR" 4
|
|
.IX Item "-no-CAfile"
|
|
Do not load the trusted \s-1CA\s0 certificates from the default file location.
|
|
.IP "\fB\-no\-CApath\fR" 4
|
|
.IX Item "-no-CApath"
|
|
Do not load the trusted \s-1CA\s0 certificates from the default directory location.
|
|
.IP "\fB\-nocert\fR" 4
|
|
.IX Item "-nocert"
|
|
If this option is set then no certificate is used. This restricts the
|
|
cipher suites available to the anonymous ones (currently just anonymous
|
|
\&\s-1DH\s0).
|
|
.IP "\fB\-quiet\fR" 4
|
|
.IX Item "-quiet"
|
|
Inhibit printing of session and certificate information.
|
|
.IP "\fB\-www\fR" 4
|
|
.IX Item "-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 \s-1HTML\s0 format so this option will normally be used with a
|
|
web browser. Cannot be used in conjunction with \fB\-early_data\fR.
|
|
.IP "\fB\-WWW\fR" 4
|
|
.IX Item "-WWW"
|
|
Emulates a simple web server. Pages will be resolved relative to the
|
|
current directory, for example if the \s-1URL\s0 https://myhost/page.html is
|
|
requested the file ./page.html will be loaded. Cannot be used in conjunction
|
|
with \fB\-early_data\fR.
|
|
.IP "\fB\-tlsextdebug\fR" 4
|
|
.IX Item "-tlsextdebug"
|
|
Print a hex dump of any \s-1TLS\s0 extensions received from the server.
|
|
.IP "\fB\-HTTP\fR" 4
|
|
.IX Item "-HTTP"
|
|
Emulates a simple web server. Pages will be resolved relative to the
|
|
current directory, for example if the \s-1URL\s0 https://myhost/page.html is
|
|
requested the file ./page.html will be loaded. The files loaded are
|
|
assumed to contain a complete and correct \s-1HTTP\s0 response (lines that
|
|
are part of the \s-1HTTP\s0 response line and headers must end with \s-1CRLF\s0). Cannot be
|
|
used in conjunction with \fB\-early_data\fR.
|
|
.IP "\fB\-id_prefix val\fR" 4
|
|
.IX Item "-id_prefix val"
|
|
Generate \s-1SSL/TLS\s0 session IDs prefixed by \fBval\fR. This is mostly useful
|
|
for testing any \s-1SSL/TLS\s0 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).
|
|
.IP "\fB\-rand file...\fR" 4
|
|
.IX Item "-rand file..."
|
|
A file or files containing random data used to seed the random number
|
|
generator.
|
|
Multiple files can be specified separated by an OS-dependent character.
|
|
The separator is \fB;\fR for MS-Windows, \fB,\fR for OpenVMS, and \fB:\fR for
|
|
all others.
|
|
.IP "[\fB\-writerand file\fR]" 4
|
|
.IX Item "[-writerand file]"
|
|
Writes random data to the specified \fIfile\fR upon exit.
|
|
This can be used with a subsequent \fB\-rand\fR flag.
|
|
.IP "\fB\-verify_return_error\fR" 4
|
|
.IX Item "-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.
|
|
.IP "\fB\-status\fR" 4
|
|
.IX Item "-status"
|
|
Enables certificate status request support (aka \s-1OCSP\s0 stapling).
|
|
.IP "\fB\-status_verbose\fR" 4
|
|
.IX Item "-status_verbose"
|
|
Enables certificate status request support (aka \s-1OCSP\s0 stapling) and gives
|
|
a verbose printout of the \s-1OCSP\s0 response.
|
|
.IP "\fB\-status_timeout int\fR" 4
|
|
.IX Item "-status_timeout int"
|
|
Sets the timeout for \s-1OCSP\s0 response to \fBint\fR seconds.
|
|
.IP "\fB\-status_url val\fR" 4
|
|
.IX Item "-status_url val"
|
|
Sets a fallback responder \s-1URL\s0 to use if no responder \s-1URL\s0 is present in the
|
|
server certificate. Without this option an error is returned if the server
|
|
certificate does not contain a responder address.
|
|
.IP "\fB\-status_file infile\fR" 4
|
|
.IX Item "-status_file infile"
|
|
Overrides any \s-1OCSP\s0 responder URLs from the certificate and always provides the
|
|
\&\s-1OCSP\s0 Response stored in the file. The file must be in \s-1DER\s0 format.
|
|
.IP "\fB\-trace\fR" 4
|
|
.IX Item "-trace"
|
|
Show verbose trace output of protocol messages. OpenSSL needs to be compiled
|
|
with \fBenable-ssl-trace\fR for this option to work.
|
|
.IP "\fB\-brief\fR" 4
|
|
.IX Item "-brief"
|
|
Provide a brief summary of connection parameters instead of the normal verbose
|
|
output.
|
|
.IP "\fB\-rev\fR" 4
|
|
.IX Item "-rev"
|
|
Simple test server which just reverses the text received from the client
|
|
and sends it back to the server. Also sets \fB\-brief\fR. Cannot be used in
|
|
conjunction with \fB\-early_data\fR.
|
|
.IP "\fB\-async\fR" 4
|
|
.IX Item "-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 \fB\-engine\fR option. For test purposes the dummy async engine
|
|
(dasync) can be used (if available).
|
|
.IP "\fB\-max_send_frag +int\fR" 4
|
|
.IX Item "-max_send_frag +int"
|
|
The maximum size of data fragment to send.
|
|
See \fBSSL_CTX_set_max_send_fragment\fR\|(3) for further information.
|
|
.IP "\fB\-split_send_frag +int\fR" 4
|
|
.IX Item "-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
|
|
\&\fBSSL_CTX_set_split_send_fragment\fR\|(3) for further information.
|
|
.IP "\fB\-max_pipelines +int\fR" 4
|
|
.IX Item "-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 \fBSSL_CTX_set_max_pipelines\fR\|(3) for further information.
|
|
.IP "\fB\-read_buf +int\fR" 4
|
|
.IX Item "-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 \fBSSL_CTX_set_default_read_buffer_len\fR\|(3) for
|
|
further information).
|
|
.IP "\fB\-ssl2\fR, \fB\-ssl3\fR, \fB\-tls1\fR, \fB\-tls1_1\fR, \fB\-tls1_2\fR, \fB\-tls1_3\fR, \fB\-no_ssl2\fR, \fB\-no_ssl3\fR, \fB\-no_tls1\fR, \fB\-no_tls1_1\fR, \fB\-no_tls1_2\fR, \fB\-no_tls1_3\fR" 4
|
|
.IX Item "-ssl2, -ssl3, -tls1, -tls1_1, -tls1_2, -tls1_3, -no_ssl2, -no_ssl3, -no_tls1, -no_tls1_1, -no_tls1_2, -no_tls1_3"
|
|
These options require or disable the use of the specified \s-1SSL\s0 or \s-1TLS\s0 protocols.
|
|
By default \fBs_server\fR will negotiate the highest mutually supported protocol
|
|
version.
|
|
When a specific \s-1TLS\s0 version is required, only that version will be accepted
|
|
from the client.
|
|
Note that not all protocols and flags may be available, depending on how
|
|
OpenSSL was built.
|
|
.IP "\fB\-bugs\fR" 4
|
|
.IX Item "-bugs"
|
|
There are several known bugs in \s-1SSL\s0 and \s-1TLS\s0 implementations. Adding this
|
|
option enables various workarounds.
|
|
.IP "\fB\-no_comp\fR" 4
|
|
.IX Item "-no_comp"
|
|
Disable negotiation of \s-1TLS\s0 compression.
|
|
\&\s-1TLS\s0 compression is not recommended and is off by default as of
|
|
OpenSSL 1.1.0.
|
|
.IP "\fB\-comp\fR" 4
|
|
.IX Item "-comp"
|
|
Enable negotiation of \s-1TLS\s0 compression.
|
|
This option was introduced in OpenSSL 1.1.0.
|
|
\&\s-1TLS\s0 compression is not recommended and is off by default as of
|
|
OpenSSL 1.1.0.
|
|
.IP "\fB\-no_ticket\fR" 4
|
|
.IX Item "-no_ticket"
|
|
Disable RFC4507bis session ticket support. This option has no effect if TLSv1.3
|
|
is negotiated. See \fB\-num_tickets\fR.
|
|
.IP "\fB\-num_tickets\fR" 4
|
|
.IX Item "-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.
|
|
.IP "\fB\-serverpref\fR" 4
|
|
.IX Item "-serverpref"
|
|
Use the server's cipher preferences, rather than the client's preferences.
|
|
.IP "\fB\-prioritize_chacha\fR" 4
|
|
.IX Item "-prioritize_chacha"
|
|
Prioritize ChaCha ciphers when preferred by clients. Requires \fB\-serverpref\fR.
|
|
.IP "\fB\-no_resumption_on_reneg\fR" 4
|
|
.IX Item "-no_resumption_on_reneg"
|
|
Set the \fB\s-1SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION\s0\fR option.
|
|
.IP "\fB\-client_sigalgs val\fR" 4
|
|
.IX Item "-client_sigalgs val"
|
|
Signature algorithms to support for client certificate authentication
|
|
(colon-separated list).
|
|
.IP "\fB\-named_curve val\fR" 4
|
|
.IX Item "-named_curve val"
|
|
Specifies the elliptic curve to use. \s-1NOTE:\s0 this is single curve, not a list.
|
|
For a list of all possible curves, use:
|
|
.Sp
|
|
.Vb 1
|
|
\& $ openssl ecparam \-list_curves
|
|
.Ve
|
|
.IP "\fB\-cipher val\fR" 4
|
|
.IX Item "-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
|
|
the \fBciphers\fR command for more information.
|
|
.IP "\fB\-ciphersuites val\fR" 4
|
|
.IX Item "-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
|
|
the \fBciphers\fR command for more information. The format for this list is a
|
|
simple colon (\*(L":\*(R") separated list of TLSv1.3 ciphersuite names.
|
|
.IP "\fB\-dhparam infile\fR" 4
|
|
.IX Item "-dhparam infile"
|
|
The \s-1DH\s0 parameter file to use. The ephemeral \s-1DH\s0 cipher suites generate keys
|
|
using a set of \s-1DH\s0 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 \fBs_server\fR
|
|
program will be used.
|
|
.IP "\fB\-attime\fR, \fB\-check_ss_sig\fR, \fB\-crl_check\fR, \fB\-crl_check_all\fR, \fB\-explicit_policy\fR, \fB\-extended_crl\fR, \fB\-ignore_critical\fR, \fB\-inhibit_any\fR, \fB\-inhibit_map\fR, \fB\-no_alt_chains\fR, \fB\-no_check_time\fR, \fB\-partial_chain\fR, \fB\-policy\fR, \fB\-policy_check\fR, \fB\-policy_print\fR, \fB\-purpose\fR, \fB\-suiteB_128\fR, \fB\-suiteB_128_only\fR, \fB\-suiteB_192\fR, \fB\-trusted_first\fR, \fB\-use_deltas\fR, \fB\-auth_level\fR, \fB\-verify_depth\fR, \fB\-verify_email\fR, \fB\-verify_hostname\fR, \fB\-verify_ip\fR, \fB\-verify_name\fR, \fB\-x509_strict\fR" 4
|
|
.IX Item "-attime, -check_ss_sig, -crl_check, -crl_check_all, -explicit_policy, -extended_crl, -ignore_critical, -inhibit_any, -inhibit_map, -no_alt_chains, -no_check_time, -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"
|
|
Set different peer certificate verification options.
|
|
See the \fBverify\fR\|(1) manual page for details.
|
|
.IP "\fB\-crl_check\fR, \fB\-crl_check_all\fR" 4
|
|
.IX Item "-crl_check, -crl_check_all"
|
|
Check the peer certificate has not been revoked by its \s-1CA.\s0
|
|
The \s-1CRL\s0(s) are appended to the certificate file. With the \fB\-crl_check_all\fR
|
|
option all CRLs of all CAs in the chain are checked.
|
|
.IP "\fB\-nbio\fR" 4
|
|
.IX Item "-nbio"
|
|
Turns on non blocking I/O.
|
|
.IP "\fB\-psk_identity val\fR" 4
|
|
.IX Item "-psk_identity val"
|
|
Expect the client to send \s-1PSK\s0 identity \fBval\fR when using a \s-1PSK\s0
|
|
cipher suite, and warn if they do not. By default, the expected \s-1PSK\s0
|
|
identity is the string \*(L"Client_identity\*(R".
|
|
.IP "\fB\-psk_hint val\fR" 4
|
|
.IX Item "-psk_hint val"
|
|
Use the \s-1PSK\s0 identity hint \fBval\fR when using a \s-1PSK\s0 cipher suite.
|
|
.IP "\fB\-psk val\fR" 4
|
|
.IX Item "-psk val"
|
|
Use the \s-1PSK\s0 key \fBval\fR when using a \s-1PSK\s0 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 \s-1PSK\s0 cipher.
|
|
.IP "\fB\-psk_session file\fR" 4
|
|
.IX Item "-psk_session file"
|
|
Use the pem encoded \s-1SSL_SESSION\s0 data stored in \fBfile\fR as the basis of a \s-1PSK.\s0
|
|
Note that this will only work if TLSv1.3 is negotiated.
|
|
.IP "\fB\-listen\fR" 4
|
|
.IX Item "-listen"
|
|
This option can only be used in conjunction with one of the \s-1DTLS\s0 options above.
|
|
With this option \fBs_server\fR will listen on a \s-1UDP\s0 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 \fBs_server\fR will connect to
|
|
that peer and complete the handshake.
|
|
.IP "\fB\-dtls\fR, \fB\-dtls1\fR, \fB\-dtls1_2\fR" 4
|
|
.IX Item "-dtls, -dtls1, -dtls1_2"
|
|
These options make \fBs_server\fR use \s-1DTLS\s0 protocols instead of \s-1TLS.\s0
|
|
With \fB\-dtls\fR, \fBs_server\fR will negotiate any supported \s-1DTLS\s0 protocol version,
|
|
whilst \fB\-dtls1\fR and \fB\-dtls1_2\fR will only support DTLSv1.0 and DTLSv1.2
|
|
respectively.
|
|
.IP "\fB\-sctp\fR" 4
|
|
.IX Item "-sctp"
|
|
Use \s-1SCTP\s0 for the transport protocol instead of \s-1UDP\s0 in \s-1DTLS.\s0 Must be used in
|
|
conjunction with \fB\-dtls\fR, \fB\-dtls1\fR or \fB\-dtls1_2\fR. This option is only
|
|
available where OpenSSL has support for \s-1SCTP\s0 enabled.
|
|
.IP "\fB\-sctp_label_bug\fR" 4
|
|
.IX Item "-sctp_label_bug"
|
|
Use the incorrect behaviour of older OpenSSL implementations when computing
|
|
endpoint-pair shared secrets for \s-1DTLS/SCTP.\s0 This allows communication with
|
|
older broken implementations but breaks interoperability with correct
|
|
implementations. Must be used in conjunction with \fB\-sctp\fR. This option is only
|
|
available where OpenSSL has support for \s-1SCTP\s0 enabled.
|
|
.IP "\fB\-no_dhe\fR" 4
|
|
.IX Item "-no_dhe"
|
|
If this option is set then no \s-1DH\s0 parameters will be loaded effectively
|
|
disabling the ephemeral \s-1DH\s0 cipher suites.
|
|
.IP "\fB\-alpn val\fR, \fB\-nextprotoneg val\fR" 4
|
|
.IX Item "-alpn val, -nextprotoneg val"
|
|
These flags enable the Enable the Application-Layer Protocol Negotiation
|
|
or Next Protocol Negotiation (\s-1NPN\s0) extension, respectively. \s-1ALPN\s0 is the
|
|
\&\s-1IETF\s0 standard and replaces \s-1NPN.\s0
|
|
The \fBval\fR list is a comma-separated list of supported protocol
|
|
names. The list should contain the most desirable protocols first.
|
|
Protocol names are printable \s-1ASCII\s0 strings, for example \*(L"http/1.1\*(R" or
|
|
\&\*(L"spdy/3\*(R".
|
|
The flag \fB\-nextprotoneg\fR cannot be specified if \fB\-tls1_3\fR is used.
|
|
.IP "\fB\-engine val\fR" 4
|
|
.IX Item "-engine val"
|
|
Specifying an engine (by its unique id string in \fBval\fR) will cause \fBs_server\fR
|
|
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.
|
|
.IP "\fB\-keylogfile outfile\fR" 4
|
|
.IX Item "-keylogfile outfile"
|
|
Appends \s-1TLS\s0 secrets to the specified keylog file such that external programs
|
|
(like Wireshark) can decrypt \s-1TLS\s0 connections.
|
|
.IP "\fB\-max_early_data int\fR" 4
|
|
.IX Item "-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 \fB\-early_data\fR
|
|
flag). The default value is approximately 16k. The argument must be an integer
|
|
greater than or equal to 0.
|
|
.IP "\fB\-early_data\fR" 4
|
|
.IX Item "-early_data"
|
|
Accept early data where possible. Cannot be used in conjunction with \fB\-www\fR,
|
|
\&\fB\-WWW\fR, \fB\-HTTP\fR or \fB\-rev\fR.
|
|
.IP "\fB\-anti_replay\fR, \fB\-no_anti_replay\fR" 4
|
|
.IX Item "-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.
|
|
.SH "CONNECTED COMMANDS"
|
|
.IX Header "CONNECTED COMMANDS"
|
|
If a connection request is established with an \s-1SSL\s0 client and neither the
|
|
\&\fB\-www\fR nor the \fB\-WWW\fR option has been used then normally any data received
|
|
from the client is displayed and any key presses will be sent to the client.
|
|
.PP
|
|
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.
|
|
.IP "\fBq\fR" 4
|
|
.IX Item "q"
|
|
End the current \s-1SSL\s0 connection but still accept new connections.
|
|
.IP "\fBQ\fR" 4
|
|
.IX Item "Q"
|
|
End the current \s-1SSL\s0 connection and exit.
|
|
.IP "\fBr\fR" 4
|
|
.IX Item "r"
|
|
Renegotiate the \s-1SSL\s0 session (TLSv1.2 and below only).
|
|
.IP "\fBR\fR" 4
|
|
.IX Item "R"
|
|
Renegotiate the \s-1SSL\s0 session and request a client certificate (TLSv1.2 and below
|
|
only).
|
|
.IP "\fBP\fR" 4
|
|
.IX Item "P"
|
|
Send some plain text down the underlying \s-1TCP\s0 connection: this should
|
|
cause the client to disconnect due to a protocol violation.
|
|
.IP "\fBS\fR" 4
|
|
.IX Item "S"
|
|
Print out some session cache status information.
|
|
.IP "\fBB\fR" 4
|
|
.IX Item "B"
|
|
Send a heartbeat message to the client (\s-1DTLS\s0 only)
|
|
.IP "\fBk\fR" 4
|
|
.IX Item "k"
|
|
Send a key update message to the client (TLSv1.3 only)
|
|
.IP "\fBK\fR" 4
|
|
.IX Item "K"
|
|
Send a key update message to the client and request one back (TLSv1.3 only)
|
|
.IP "\fBc\fR" 4
|
|
.IX Item "c"
|
|
Send a certificate request to the client (TLSv1.3 only)
|
|
.SH "NOTES"
|
|
.IX Header "NOTES"
|
|
\&\fBs_server\fR can be used to debug \s-1SSL\s0 clients. To accept connections from
|
|
a web browser the command:
|
|
.PP
|
|
.Vb 1
|
|
\& openssl s_server \-accept 443 \-www
|
|
.Ve
|
|
.PP
|
|
can be used for example.
|
|
.PP
|
|
Although specifying an empty list of CAs when requesting a client certificate
|
|
is strictly speaking a protocol violation, some \s-1SSL\s0 clients interpret this to
|
|
mean any \s-1CA\s0 is acceptable. This is useful for debugging purposes.
|
|
.PP
|
|
The session parameters can printed out using the \fBsess_id\fR program.
|
|
.SH "BUGS"
|
|
.IX Header "BUGS"
|
|
Because this program has a lot of options and also because some of the
|
|
techniques used are rather old, the C source of \fBs_server\fR is rather hard to
|
|
read and not a model of how things should be done.
|
|
A typical \s-1SSL\s0 server program would be much simpler.
|
|
.PP
|
|
The output of common ciphers is wrong: it just gives the list of ciphers that
|
|
OpenSSL recognizes and the client supports.
|
|
.PP
|
|
There should be a way for the \fBs_server\fR program to print out details of any
|
|
unknown cipher suites a client says it supports.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fBSSL_CONF_cmd\fR\|(3), \fBsess_id\fR\|(1), \fBs_client\fR\|(1), \fBciphers\fR\|(1)
|
|
\&\fBSSL_CTX_set_max_send_fragment\fR\|(3),
|
|
\&\fBSSL_CTX_set_split_send_fragment\fR\|(3),
|
|
\&\fBSSL_CTX_set_max_pipelines\fR\|(3)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
The \-no_alt_chains option was added in OpenSSL 1.1.0.
|
|
.PP
|
|
The
|
|
\&\-allow\-no\-dhe\-kex and \-prioritize_chacha options were added in OpenSSL 1.1.1.
|
|
.SH "COPYRIGHT"
|
|
.IX Header "COPYRIGHT"
|
|
Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved.
|
|
.PP
|
|
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file \s-1LICENSE\s0 in the source distribution or at
|
|
<https://www.openssl.org/source/license.html>.
|