mirror of
https://github.com/openssl/openssl.git
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8b3efb5302
Refactor common flags for SSL/TLS connection options. Update SSL_CONF_cmd.pod to match ordering. Rewrite much of the documentation. Fixes #10160 Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com> Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> (Merged from https://github.com/openssl/openssl/pull/10191)
781 lines
23 KiB
Plaintext
781 lines
23 KiB
Plaintext
=pod
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{- OpenSSL::safe::output_do_not_edit_headers(); -}
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=head1 NAME
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openssl-s_server - SSL/TLS server program
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=head1 SYNOPSIS
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B<openssl> B<s_server>
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[B<-help>]
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[B<-port> I<+int>]
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[B<-accept> I<val>]
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[B<-unix> I<val>]
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[B<-4>]
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[B<-6>]
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[B<-unlink>]
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[B<-context> I<val>]
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[B<-verify> I<int>]
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[B<-Verify> I<int>]
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[B<-cert> I<infile>]
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[B<-naccept> I<+int>]
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[B<-serverinfo> I<val>]
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[B<-certform> B<DER>|B<PEM>]
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[B<-key> I<infile>]
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[B<-keyform> B<DER>|B<PEM>]
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[B<-pass> I<val>]
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[B<-dcert> I<infile>]
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[B<-dcertform> B<DER>|B<PEM>]
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[B<-dkey> I<infile>]
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[B<-dkeyform> B<DER>|B<PEM>]
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[B<-dpass> I<val>]
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[B<-nbio_test>]
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[B<-crlf>]
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[B<-debug>]
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[B<-msg>]
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[B<-msgfile> I<outfile>]
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[B<-state>]
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[B<-nocert>]
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[B<-quiet>]
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[B<-no_resume_ephemeral>]
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[B<-www>]
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[B<-WWW>]
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[B<-http_server_binmode>]
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[B<-servername>]
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[B<-servername_fatal>]
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[B<-cert2> I<infile>]
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[B<-key2> I<infile>]
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[B<-tlsextdebug>]
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[B<-HTTP>]
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[B<-id_prefix> I<val>]
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[B<-keymatexport> I<val>]
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[B<-keymatexportlen> I<+int>]
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[B<-CRLform> B<DER>|B<PEM>]
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[B<-CRL> I<infile>]
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[B<-crl_download>]
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[B<-cert_chain> I<infile>]
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[B<-dcert_chain> I<infile>]
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[B<-chainCApath> I<dir>]
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[B<-verifyCApath> I<dir>]
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[B<-chainCAstore> I<uri>]
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[B<-verifyCAstore> I<uri>]
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[B<-no_cache>]
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[B<-ext_cache>]
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[B<-verify_return_error>]
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[B<-verify_quiet>]
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[B<-build_chain>]
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[B<-chainCAfile> I<infile>]
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[B<-verifyCAfile> I<infile>]
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[B<-ign_eof>]
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[B<-no_ign_eof>]
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[B<-status>]
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[B<-status_verbose>]
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[B<-status_timeout> I<int>]
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[B<-status_url> I<val>]
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[B<-status_file> I<infile>]
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[B<-trace>]
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[B<-security_debug>]
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[B<-security_debug_verbose>]
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[B<-brief>]
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[B<-rev>]
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[B<-async>]
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[B<-ssl_config> I<val>]
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[B<-max_send_frag> I<+int>]
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[B<-split_send_frag> I<+int>]
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[B<-max_pipelines> I<+int>]
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[B<-read_buf> I<+int>]
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[B<-bugs>]
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[B<-no_comp>]
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[B<-comp>]
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[B<-no_ticket>]
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[B<-serverpref>]
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[B<-legacy_renegotiation>]
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[B<-no_renegotiation>]
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[B<-legacy_server_connect>]
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[B<-no_resumption_on_reneg>]
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[B<-no_legacy_server_connect>]
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[B<-allow_no_dhe_kex>]
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[B<-prioritize_chacha>]
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[B<-strict>]
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[B<-sigalgs> I<val>]
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[B<-client_sigalgs> I<val>]
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[B<-groups> I<val>]
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[B<-curves> I<val>]
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[B<-named_curve> I<val>]
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[B<-cipher> I<val>]
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[B<-ciphersuites> I<val>]
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[B<-dhparam> I<infile>]
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[B<-record_padding> I<val>]
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[B<-debug_broken_protocol>]
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[B<-nbio>]
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[B<-psk_identity> I<val>]
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[B<-psk_hint> I<val>]
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[B<-psk> I<val>]
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[B<-psk_session> I<file>]
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[B<-srpvfile> I<infile>]
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[B<-srpuserseed> I<val>]
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[B<-timeout>]
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[B<-mtu> I<+int>]
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[B<-listen>]
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[B<-sctp>]
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[B<-sctp_label_bug>]
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[B<-no_dhe>]
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[B<-nextprotoneg> I<val>]
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[B<-use_srtp> I<val>]
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[B<-alpn> I<val>]
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[B<-keylogfile> I<outfile>]
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[B<-recv_max_early_data> I<int>]
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[B<-max_early_data> I<int>]
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[B<-early_data>]
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[B<-stateless>]
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[B<-anti_replay>]
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[B<-no_anti_replay>]
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[B<-num_tickets>]
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{- $OpenSSL::safe::opt_name_synopsis -}
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{- $OpenSSL::safe::opt_version_synopsis -}
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{- $OpenSSL::safe::opt_v_synopsis -}
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{- $OpenSSL::safe::opt_s_synopsis -}
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{- $OpenSSL::safe::opt_x_synopsis -}
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{- $OpenSSL::safe::opt_trust_synopsis -}
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{- $OpenSSL::safe::opt_r_synopsis -}
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{- $OpenSSL::safe::opt_engine_synopsis -}
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=for openssl ifdef unix 4 6 unlink no_dhe nextprotoneg use_srtp engine
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=for openssl ifdef status status_verbose status_timeout status_url status_file
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=for openssl ifdef psk_hint srpvfile srpuserseed sctp sctp_label_bug
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=for openssl ifdef sctp sctp_label_bug trace mtu timeout listen
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=for openssl ifdef ssl3 tls1 tls1_1 tls1_2 tls1_3 dtls mtu dtls1 dtls1_2
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=head1 DESCRIPTION
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This command implements a generic SSL/TLS server which
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listens for connections on a given port using SSL/TLS.
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=head1 OPTIONS
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In addition to the options below, this command also supports
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the common and server only options documented
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L<SSL_CONF_cmd(3)/Supported Command Line Commands>
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=over 4
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=item B<-help>
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Print out a usage message.
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=item B<-port> I<+int>
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The TCP port to listen on for connections. If not specified 4433 is used.
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=item B<-accept> I<val>
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The optional TCP host and port to listen on for connections. If not specified, *:4433 is used.
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=item B<-unix> I<val>
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Unix domain socket to accept on.
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=item B<-4>
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Use IPv4 only.
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=item B<-6>
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Use IPv6 only.
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=item B<-unlink>
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For -unix, unlink any existing socket first.
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=item B<-context> I<val>
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Sets the SSL context id. It can be given any string value. If this option
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is not present a default value will be used.
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=item B<-verify> I<int>, B<-Verify> I<int>
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The verify depth to use. This specifies the maximum length of the
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client certificate chain and makes the server request a certificate from
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the client. With the B<-verify> option a certificate is requested but the
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client does not have to send one, with the B<-Verify> option the client
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must supply a certificate or an error occurs.
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If the cipher suite cannot request a client certificate (for example an
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anonymous cipher suite or PSK) this option has no effect.
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=item B<-cert> I<infile>
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The certificate to use, most servers cipher suites require the use of a
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certificate and some require a certificate with a certain public key type:
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for example the DSS cipher suites require a certificate containing a DSS
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(DSA) key. If not specified then the filename F<server.pem> will be used.
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=item B<-cert_chain>
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A file containing trusted certificates to use when attempting to build the
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client/server certificate chain related to the certificate specified via the
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B<-cert> option.
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=item B<-build_chain>
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Specify whether the application should build the certificate chain to be
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provided to the client.
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=item B<-naccept> I<+int>
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The server will exit after receiving the specified number of connections,
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default unlimited.
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=item B<-serverinfo> I<val>
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A file containing one or more blocks of PEM data. Each PEM block
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must encode a TLS ServerHello extension (2 bytes type, 2 bytes length,
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followed by "length" bytes of extension data). If the client sends
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an empty TLS ClientHello extension matching the type, the corresponding
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ServerHello extension will be returned.
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=item B<-certform> B<DER>|B<PEM>, B<-CRLForm> B<DER>|B<PEM>
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The certificate and CRL format; the default is PEM.
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See L<openssl(1)/Format Options> for details.
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=item B<-key> I<infile>
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The private key to use. If not specified then the certificate file will
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be used.
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=item B<-keyform> B<DER>|B<PEM>
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The key format; the default is B<PEM>.
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See L<openssl(1)/Format Options> for details.
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=item B<-pass> I<val>
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The private key password source.
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For more information about the format of I<val>,
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see L<openssl(1)/Pass Phrase Options>.
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=item B<-dcert> I<infile>, B<-dkey> I<infile>
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Specify an additional certificate and private key, these behave in the
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same manner as the B<-cert> and B<-key> options except there is no default
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if they are not specified (no additional certificate and key is used). As
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noted above some cipher suites require a certificate containing a key of
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a certain type. Some cipher suites need a certificate carrying an RSA key
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and some a DSS (DSA) key. By using RSA and DSS certificates and keys
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a server can support clients which only support RSA or DSS cipher suites
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by using an appropriate certificate.
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=item B<-dcert_chain>
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A file containing trusted certificates to use when attempting to build the
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server certificate chain when a certificate specified via the B<-dcert> option
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is in use.
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=item B<-dcertform> B<DER>|B<PEM>, B<-dkeyform> B<DER>|B<PEM>
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The format of the certificate and private key; the default is B<PEM>
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see L<openssl(1)/Format Options>.
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=item B<-dpass> I<val>
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The passphrase for the additional private key.
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For more information about the format of I<val>,
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see L<openssl(1)/Pass Phrase Options>.
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=item B<-nbio_test>
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Tests non blocking I/O.
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=item B<-crlf>
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This option translated a line feed from the terminal into CR+LF.
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=item B<-debug>
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Print extensive debugging information including a hex dump of all traffic.
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=item B<-msg>
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Show all protocol messages with hex dump.
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=item B<-msgfile> I<outfile>
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File to send output of B<-msg> or B<-trace> to, default standard output.
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=item B<-state>
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Prints the SSL session states.
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=item B<-chainCApath> I<dir>
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The directory to use for building the chain provided to the client. This
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directory must be in "hash format", see L<openssl-verify(1)> for more
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information.
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=item B<-chainCAfile> I<file>
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A file containing trusted certificates to use when attempting to build the
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server certificate chain.
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=item B<-chainCAstore> I<uri>
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The URI to a store to use for building the chain provided to the client.
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The URI may indicate a single certificate, as well as a collection of
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them.
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With URIs in the C<file:> scheme, this acts as B<-chainCAfile> or
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B<-chainCApath>, depending on if the URI indicates a directory or a
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single file.
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See L<ossl_store-file(7)> for more information on the C<file:> scheme.
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=item B<-nocert>
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If this option is set then no certificate is used. This restricts the
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cipher suites available to the anonymous ones (currently just anonymous
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DH).
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=item B<-quiet>
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Inhibit printing of session and certificate information.
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=item B<-tlsextdebug>
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Print a hex dump of any TLS extensions received from the server.
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=item B<-www>
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Sends a status message back to the client when it connects. This includes
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information about the ciphers used and various session parameters.
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The output is in HTML format so this option can be used with a web browser.
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The special URL C</renegcert> turns on client cert validation, and C</reneg>
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tells the server to request renegotiation.
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The B<-early_data> option cannot be used with this option.
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=item B<-WWW>, B<-HTTP>
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Emulates a simple web server. Pages will be resolved relative to the
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current directory, for example if the URL C<https://myhost/page.html> is
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requested the file F<./page.html> will be sent.
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If the B<-HTTP> flag is used, the files are sent directly, and should contain
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any HTTP response headers (including status response line).
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If the B<-WWW> option is used,
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the response headers are generated by the server, and the file extension is
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examined to determine the B<Content-Type> header.
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Extensions of C<html>, C<htm>, and C<php> are C<text/html> and all others are
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C<text/plain>.
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In addition, the special URL C</stats> will return status
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information like the B<-www> option.
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Neither of these options can be used in conjunction with B<-early_data>.
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=item B<-http_server_binmode>
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When acting as web-server (using option B<-WWW> or B<-HTTP>) open files requested
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by the client in binary mode.
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=item B<-id_prefix> I<val>
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Generate SSL/TLS session IDs prefixed by I<val>. This is mostly useful
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for testing any SSL/TLS code (eg. proxies) that wish to deal with multiple
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servers, when each of which might be generating a unique range of session
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IDs (eg. with a certain prefix).
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=item B<-verify_return_error>
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Verification errors normally just print a message but allow the
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connection to continue, for debugging purposes.
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If this option is used, then verification errors close the connection.
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=item B<-status>
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Enables certificate status request support (aka OCSP stapling).
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=item B<-status_verbose>
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Enables certificate status request support (aka OCSP stapling) and gives
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a verbose printout of the OCSP response.
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=item B<-status_timeout> I<int>
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Sets the timeout for OCSP response to I<int> seconds.
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=item B<-status_url> I<val>
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Sets a fallback responder URL to use if no responder URL is present in the
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server certificate. Without this option an error is returned if the server
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certificate does not contain a responder address.
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=item B<-status_file> I<infile>
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Overrides any OCSP responder URLs from the certificate and always provides the
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OCSP Response stored in the file. The file must be in DER format.
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=item B<-trace>
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Show verbose trace output of protocol messages. OpenSSL needs to be compiled
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with B<enable-ssl-trace> for this option to work.
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=item B<-brief>
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Provide a brief summary of connection parameters instead of the normal verbose
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output.
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=item B<-rev>
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Simple test server which just reverses the text received from the client
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and sends it back to the server. Also sets B<-brief>. Cannot be used in
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conjunction with B<-early_data>.
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=item B<-async>
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Switch on asynchronous mode. Cryptographic operations will be performed
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asynchronously. This will only have an effect if an asynchronous capable engine
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is also used via the B<-engine> option. For test purposes the dummy async engine
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(dasync) can be used (if available).
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=item B<-max_send_frag> I<+int>
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The maximum size of data fragment to send.
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See L<SSL_CTX_set_max_send_fragment(3)> for further information.
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=item B<-split_send_frag> I<+int>
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The size used to split data for encrypt pipelines. If more data is written in
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one go than this value then it will be split into multiple pipelines, up to the
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maximum number of pipelines defined by max_pipelines. This only has an effect if
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a suitable cipher suite has been negotiated, an engine that supports pipelining
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has been loaded, and max_pipelines is greater than 1. See
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L<SSL_CTX_set_split_send_fragment(3)> for further information.
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=item B<-max_pipelines> I<+int>
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The maximum number of encrypt/decrypt pipelines to be used. This will only have
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an effect if an engine has been loaded that supports pipelining (e.g. the dasync
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engine) and a suitable cipher suite has been negotiated. The default value is 1.
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See L<SSL_CTX_set_max_pipelines(3)> for further information.
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=item B<-read_buf> I<+int>
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The default read buffer size to be used for connections. This will only have an
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effect if the buffer size is larger than the size that would otherwise be used
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and pipelining is in use (see L<SSL_CTX_set_default_read_buffer_len(3)> for
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further information).
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=item B<-bugs>
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There are several known bugs in SSL and TLS implementations. Adding this
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option enables various workarounds.
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=item B<-no_comp>
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Disable negotiation of TLS compression.
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TLS compression is not recommended and is off by default as of
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OpenSSL 1.1.0.
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=item B<-comp>
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Enable negotiation of TLS compression.
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This option was introduced in OpenSSL 1.1.0.
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TLS compression is not recommended and is off by default as of
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OpenSSL 1.1.0.
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=item B<-no_ticket>
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Disable RFC4507bis session ticket support. This option has no effect if TLSv1.3
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is negotiated. See B<-num_tickets>.
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=item B<-num_tickets>
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Control the number of tickets that will be sent to the client after a full
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handshake in TLSv1.3. The default number of tickets is 2. This option does not
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affect the number of tickets sent after a resumption handshake.
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=item B<-serverpref>
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Use the server's cipher preferences, rather than the client's preferences.
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=item B<-prioritize_chacha>
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|
Prioritize ChaCha ciphers when preferred by clients. Requires B<-serverpref>.
|
|
|
|
=item B<-no_resumption_on_reneg>
|
|
|
|
Set the B<SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION> option.
|
|
|
|
=item B<-client_sigalgs> I<val>
|
|
|
|
Signature algorithms to support for client certificate authentication
|
|
(colon-separated list).
|
|
|
|
=item B<-named_curve> I<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
|
|
|
|
=item B<-cipher> I<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
|
|
L<openssl-ciphers(1)> for more information.
|
|
|
|
=item B<-ciphersuites> I<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
|
|
L<openssl-ciphers(1)> command for more information. The format for this list is
|
|
a simple colon (":") separated list of TLSv1.3 ciphersuite names.
|
|
|
|
=item B<-dhparam> I<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.
|
|
|
|
=item B<-nbio>
|
|
|
|
Turns on non blocking I/O.
|
|
|
|
=item B<-psk_identity> I<val>
|
|
|
|
Expect the client to send PSK identity I<val> when using a PSK
|
|
cipher suite, and warn if they do not. By default, the expected PSK
|
|
identity is the string "Client_identity".
|
|
|
|
=item B<-psk_hint> I<val>
|
|
|
|
Use the PSK identity hint I<val> when using a PSK cipher suite.
|
|
|
|
=item B<-psk> I<val>
|
|
|
|
Use the PSK key I<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.
|
|
|
|
=item B<-psk_session> I<file>
|
|
|
|
Use the pem encoded SSL_SESSION data stored in I<file> as the basis of a PSK.
|
|
Note that this will only work if TLSv1.3 is negotiated.
|
|
|
|
=item B<-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.
|
|
|
|
=item B<-sctp>
|
|
|
|
Use SCTP for the transport protocol instead of UDP in DTLS. Must be used in
|
|
conjunction with B<-dtls>, B<-dtls1> or B<-dtls1_2>. This option is only
|
|
available where OpenSSL has support for SCTP enabled.
|
|
|
|
=item B<-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 B<-sctp>. This option is only
|
|
available where OpenSSL has support for SCTP enabled.
|
|
|
|
=item B<-no_dhe>
|
|
|
|
If this option is set then no DH parameters will be loaded effectively
|
|
disabling the ephemeral DH cipher suites.
|
|
|
|
=item B<-alpn> I<val>, B<-nextprotoneg> I<val>
|
|
|
|
These flags enable the Enable the Application-Layer Protocol Negotiation
|
|
or Next Protocol Negotiation (NPN) extension, respectively. ALPN is the
|
|
IETF standard and replaces NPN.
|
|
The I<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 B<-nextprotoneg> cannot be specified if B<-tls1_3> is used.
|
|
|
|
=item B<-keylogfile> I<outfile>
|
|
|
|
Appends TLS secrets to the specified keylog file such that external programs
|
|
(like Wireshark) can decrypt TLS connections.
|
|
|
|
=item B<-max_early_data> I<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 B<-early_data>
|
|
flag). The default value is approximately 16k. The argument must be an integer
|
|
greater than or equal to 0.
|
|
|
|
=item B<-recv_max_early_data> I<int>
|
|
|
|
Specify the hard limit on the maximum number of early data bytes that will
|
|
be accepted.
|
|
|
|
=item B<-early_data>
|
|
|
|
Accept early data where possible. Cannot be used in conjunction with B<-www>,
|
|
B<-WWW>, B<-HTTP> or B<-rev>.
|
|
|
|
=item B<-stateless>
|
|
|
|
Require TLSv1.3 cookies.
|
|
|
|
=item B<-anti_replay>, B<-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.
|
|
|
|
{- $OpenSSL::safe::opt_name_item -}
|
|
|
|
{- $OpenSSL::safe::opt_version_item -}
|
|
|
|
{- $OpenSSL::safe::opt_s_item -}
|
|
|
|
{- $OpenSSL::safe::opt_x_item -}
|
|
|
|
{- $OpenSSL::safe::opt_trust_item -}
|
|
|
|
{- $OpenSSL::safe::opt_r_item -}
|
|
|
|
{- $OpenSSL::safe::opt_engine_item -}
|
|
|
|
{- $OpenSSL::safe::opt_v_item -}
|
|
|
|
If the server requests a client certificate, then
|
|
verification errors are displayed, for debugging, but the command will
|
|
proceed unless the B<-verify_return_error> option is used.
|
|
|
|
=back
|
|
|
|
=head1 CONNECTED COMMANDS
|
|
|
|
If a connection request is established with an SSL client and neither the
|
|
B<-www> nor the B<-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.
|
|
|
|
=over 4
|
|
|
|
=item B<q>
|
|
|
|
End the current SSL connection but still accept new connections.
|
|
|
|
=item B<Q>
|
|
|
|
End the current SSL connection and exit.
|
|
|
|
=item B<r>
|
|
|
|
Renegotiate the SSL session (TLSv1.2 and below only).
|
|
|
|
=item B<R>
|
|
|
|
Renegotiate the SSL session and request a client certificate (TLSv1.2 and below
|
|
only).
|
|
|
|
=item B<P>
|
|
|
|
Send some plain text down the underlying TCP connection: this should
|
|
cause the client to disconnect due to a protocol violation.
|
|
|
|
=item B<S>
|
|
|
|
Print out some session cache status information.
|
|
|
|
=item B<k>
|
|
|
|
Send a key update message to the client (TLSv1.3 only)
|
|
|
|
=item B<K>
|
|
|
|
Send a key update message to the client and request one back (TLSv1.3 only)
|
|
|
|
=item B<c>
|
|
|
|
Send a certificate request to the client (TLSv1.3 only)
|
|
|
|
=back
|
|
|
|
=head1 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 L<openssl-sess_id(1)> command.
|
|
|
|
=head1 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.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<openssl(1)>,
|
|
L<openssl-sess_id(1)>,
|
|
L<openssl-s_client(1)>,
|
|
L<openssl-ciphers(1)>,
|
|
L<SSL_CONF_cmd(3)>,
|
|
L<SSL_CTX_set_max_send_fragment(3)>,
|
|
L<SSL_CTX_set_split_send_fragment(3)>,
|
|
L<SSL_CTX_set_max_pipelines(3)>,
|
|
L<ossl_store-file(7)>
|
|
|
|
=head1 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.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2019 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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|