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Hakase
2019-10-17 23:54:38 +09:00
parent 41a23ae6f6
commit ee84d0dd84
1357 changed files with 41111 additions and 9603 deletions
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doc/man1/openssl-s_server.pod
+181 -196
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@@ -8,36 +8,36 @@ openssl-s_server - SSL/TLS server program
B<openssl> B<s_server>
[B<-help>]
[B<-port +int>]
[B<-accept val>]
[B<-unix val>]
[B<-port> I<+int>]
[B<-accept> I<val>]
[B<-unix> I<val>]
[B<-4>]
[B<-6>]
[B<-unlink>]
[B<-context val>]
[B<-verify int>]
[B<-Verify int>]
[B<-cert infile>]
[B<-nameopt val>]
[B<-naccept +int>]
[B<-serverinfo val>]
[B<-certform PEM|DER>]
[B<-key infile>]
[B<-keyform format>]
[B<-pass val>]
[B<-dcert infile>]
[B<-dcertform PEM|DER>]
[B<-dkey infile>]
[B<-dkeyform PEM|DER>]
[B<-dpass val>]
[B<-context> I<val>]
[B<-verify> I<int>]
[B<-Verify> I<int>]
[B<-cert> I<infile>]
[B<-nameopt> I<val>]
[B<-naccept> I<+int>]
[B<-serverinfo> I<val>]
[B<-certform> B<DER>|B<PEM>]
[B<-key> I<infile>]
[B<-keyform> I<format>]
[B<-pass> I<val>]
[B<-dcert> I<infile>]
[B<-dcertform> B<DER>|B<PEM>]
[B<-dkey> I<infile>]
[B<-dkeyform> B<DER>|B<PEM>]
[B<-dpass> I<val>]
[B<-nbio_test>]
[B<-crlf>]
[B<-debug>]
[B<-msg>]
[B<-msgfile outfile>]
[B<-msgfile> I<outfile>]
[B<-state>]
[B<-CAfile infile>]
[B<-CApath dir>]
[B<-CAfile> I<infile>]
[B<-CApath> I<dir>]
[B<-no-CAfile>]
[B<-no-CApath>]
[B<-nocert>]
@@ -47,47 +47,47 @@ B<openssl> B<s_server>
[B<-WWW>]
[B<-servername>]
[B<-servername_fatal>]
[B<-cert2 infile>]
[B<-key2 infile>]
[B<-cert2> I<infile>]
[B<-key2> I<infile>]
[B<-tlsextdebug>]
[B<-HTTP>]
[B<-id_prefix val>]
[B<-rand file...>]
[B<-writerand file>]
[B<-keymatexport val>]
[B<-keymatexportlen +int>]
[B<-CRL infile>]
[B<-id_prefix> I<val>]
[B<-rand> I<files>]
[B<-writerand> I<file>]
[B<-keymatexport> I<val>]
[B<-keymatexportlen> I<+int>]
[B<-CRL> I<infile>]
[B<-crl_download>]
[B<-cert_chain infile>]
[B<-dcert_chain infile>]
[B<-chainCApath dir>]
[B<-verifyCApath dir>]
[B<-cert_chain> I<infile>]
[B<-dcert_chain> I<infile>]
[B<-chainCApath> I<dir>]
[B<-verifyCApath> I<dir>]
[B<-no_cache>]
[B<-ext_cache>]
[B<-CRLform PEM|DER>]
[B<-CRLform> B<DER>|B<PEM>]
[B<-verify_return_error>]
[B<-verify_quiet>]
[B<-build_chain>]
[B<-chainCAfile infile>]
[B<-verifyCAfile infile>]
[B<-chainCAfile> I<infile>]
[B<-verifyCAfile> I<infile>]
[B<-ign_eof>]
[B<-no_ign_eof>]
[B<-status>]
[B<-status_verbose>]
[B<-status_timeout int>]
[B<-status_url val>]
[B<-status_file infile>]
[B<-status_timeout> I<int>]
[B<-status_url> I<val>]
[B<-status_file> I<infile>]
[B<-trace>]
[B<-security_debug>]
[B<-security_debug_verbose>]
[B<-brief>]
[B<-rev>]
[B<-async>]
[B<-ssl_config val>]
[B<-max_send_frag +int>]
[B<-split_send_frag +int>]
[B<-max_pipelines +int>]
[B<-read_buf +int>]
[B<-ssl_config> I<val>]
[B<-max_send_frag> I<+int>]
[B<-split_send_frag> I<+int>]
[B<-max_pipelines> I<+int>]
[B<-read_buf> I<+int>]
[B<-no_ssl3>]
[B<-no_tls1>]
[B<-no_tls1_1>]
@@ -107,24 +107,24 @@ B<openssl> B<s_server>
[B<-allow_no_dhe_kex>]
[B<-prioritize_chacha>]
[B<-strict>]
[B<-sigalgs val>]
[B<-client_sigalgs val>]
[B<-groups val>]
[B<-curves val>]
[B<-named_curve val>]
[B<-cipher val>]
[B<-ciphersuites val>]
[B<-dhparam infile>]
[B<-record_padding val>]
[B<-sigalgs> I<val>]
[B<-client_sigalgs> I<val>]
[B<-groups> I<val>]
[B<-curves> I<val>]
[B<-named_curve> I<val>]
[B<-cipher> I<val>]
[B<-ciphersuites> I<val>]
[B<-dhparam> I<infile>]
[B<-record_padding> I<val>]
[B<-debug_broken_protocol>]
[B<-policy val>]
[B<-purpose val>]
[B<-verify_name val>]
[B<-verify_depth int>]
[B<-auth_level int>]
[B<-attime intmax>]
[B<-verify_hostname val>]
[B<-verify_email val>]
[B<-policy> I<val>]
[B<-purpose> I<val>]
[B<-verify_name> I<val>]
[B<-verify_depth> I<int>]
[B<-auth_level> I<int>]
[B<-attime> I<intmax>]
[B<-verify_hostname> I<val>]
[B<-verify_email> I<val>]
[B<-verify_ip>]
[B<-ignore_critical>]
[B<-issuer_checks>]
@@ -151,15 +151,15 @@ B<openssl> B<s_server>
[B<-xcert>]
[B<-xchain>]
[B<-xchain_build>]
[B<-xcertform PEM|DER>]
[B<-xkeyform PEM|DER>]
[B<-xcertform> B<DER>|B<PEM>]
[B<-xkeyform> B<DER>|B<PEM>]
[B<-nbio>]
[B<-psk_identity val>]
[B<-psk_hint val>]
[B<-psk val>]
[B<-psk_session file>]
[B<-srpvfile infile>]
[B<-srpuserseed val>]
[B<-psk_identity> I<val>]
[B<-psk_hint> I<val>]
[B<-psk> I<val>]
[B<-psk_session> I<file>]
[B<-srpvfile> I<infile>]
[B<-srpuserseed> I<val>]
[B<-ssl3>]
[B<-tls1>]
[B<-tls1_1>]
@@ -167,35 +167,44 @@ B<openssl> B<s_server>
[B<-tls1_3>]
[B<-dtls>]
[B<-timeout>]
[B<-mtu +int>]
[B<-mtu> I<+int>]
[B<-listen>]
[B<-dtls1>]
[B<-dtls1_2>]
[B<-sctp>]
[B<-sctp_label_bug>]
[B<-no_dhe>]
[B<-nextprotoneg val>]
[B<-use_srtp val>]
[B<-alpn val>]
[B<-engine val>]
[B<-keylogfile outfile>]
[B<-max_early_data int>]
[B<-nextprotoneg> I<val>]
[B<-use_srtp> I<val>]
[B<-alpn> I<val>]
[B<-engine> I<val>]
[B<-keylogfile> I<outfile>]
[B<-max_early_data> I<int>]
[B<-early_data>]
[B<-anti_replay>]
[B<-no_anti_replay>]
[B<-http_server_binmode>]
=for openssl ifdef unix 4 6 unlink no_dhe nextprotoneg use_srtp engine
=for openssl ifdef status status_verbose status_timeout status_url status_file
=for openssl ifdef psk_hint srpvfile srpuserseed sctp sctp_label_bug
=for openssl ifdef sctp sctp_label_bug trace mtu timeout listen
=for openssl ifdef ssl3 tls1 tls1_1 tls1_2 tls1_3 dtls mtu dtls1 dtls1_2
=head1 DESCRIPTION
The B<s_server> command implements a generic SSL/TLS server which listens
for connections on a given port using SSL/TLS.
This command implements a generic SSL/TLS server which
listens for connections on a given port using SSL/TLS.
=head1 OPTIONS
In addition to the options below the B<s_server> utility also supports the
common and server only options documented
in the "Supported Command Line Commands" section of the L<SSL_CONF_cmd(3)>
manual page.
In addition to the options below, this command also supports
the common and server only options documented
L<SSL_CONF_cmd(3)/Supported Command Line Commands>
=over 4
@@ -203,15 +212,15 @@ manual page.
Print out a usage message.
=item B<-port +int>
=item B<-port> I<+int>
The TCP port to listen on for connections. If not specified 4433 is used.
=item B<-accept val>
=item B<-accept> I<val>
The optional TCP host and port to listen on for connections. If not specified, *:4433 is used.
=item B<-unix val>
=item B<-unix> I<val>
Unix domain socket to accept on.
@@ -227,12 +236,12 @@ Use IPv6 only.
For -unix, unlink any existing socket first.
=item B<-context val>
=item B<-context> I<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.
=item B<-verify int>, B<-Verify int>
=item B<-verify> I<int>, B<-Verify> I<int>
The verify depth to use. This specifies the maximum length of the
client certificate chain and makes the server request a certificate from
@@ -243,12 +252,12 @@ 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.
=item B<-cert infile>
=item B<-cert> I<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.
(DSA) key. If not specified then the filename F<server.pem> will be used.
=item B<-cert_chain>
@@ -261,19 +270,19 @@ B<-cert> option.
Specify whether the application should build the certificate chain to be
provided to the client.
=item B<-nameopt val>
=item B<-nameopt> I<val>
Option which determines how the subject or issuer names are displayed. The
B<val> argument can be a single option or multiple options separated by
I<val> argument can be a single option or multiple options separated by
commas. Alternatively the B<-nameopt> switch may be used more than once to
set multiple options. See the L<x509(1)> manual page for details.
set multiple options. See the L<openssl-x509(1)> manual page for details.
=item B<-naccept +int>
=item B<-naccept> I<+int>
The server will exit after receiving the specified number of connections,
default unlimited.
=item B<-serverinfo val>
=item B<-serverinfo> I<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,
@@ -281,25 +290,25 @@ 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.
=item B<-certform PEM|DER>
=item B<-certform> B<DER>|B<PEM>
The certificate format to use: DER or PEM. PEM is the default.
=item B<-key infile>
=item B<-key> I<infile>
The private key to use. If not specified then the certificate file will
be used.
=item B<-keyform format>
=item B<-keyform> I<format>
The private format to use: DER or PEM. PEM is the default.
=item B<-pass val>
=item B<-pass> I<val>
The private key password source. For more information about the format of B<val>
see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
see L<openssl(1)/Pass Phrase Options>.
=item B<-dcert infile>, B<-dkey infile>
=item B<-dcert> I<infile>, B<-dkey> I<infile>
Specify an additional certificate and private key, these behave in the
same manner as the B<-cert> and B<-key> options except there is no default
@@ -316,11 +325,11 @@ A file containing trusted certificates to use when attempting to build the
server certificate chain when a certificate specified via the B<-dcert> option
is in use.
=item B<-dcertform PEM|DER>, B<-dkeyform PEM|DER>, B<-dpass val>
=item B<-dcertform> B<DER>|B<PEM>, B<-dkeyform> B<DER>|B<PEM>, B<-dpass> I<val>
Additional certificate and private key format and passphrase respectively.
=item B<-xkey infile>, B<-xcert infile>, B<-xchain>
=item B<-xkey> I<infile>, B<-xcert> I<infile>, B<-xchain>
Specify an extra certificate, private key and certificate chain. These behave
in the same manner as the B<-cert>, B<-key> and B<-cert_chain> options. When
@@ -330,10 +339,10 @@ the server.
=item B<-xchain_build>
Specify whether the application should build the certificate chain to be
provided to the client for the extra certificates provided via B<-xkey infile>,
B<-xcert infile>, B<-xchain> options.
provided to the client for the extra certificates provided via B<-xkey> I<infile>,
B<-xcert> I<infile>, B<-xchain> options.
=item B<-xcertform PEM|DER>, B<-xkeyform PEM|DER>
=item B<-xcertform> B<DER>|B<PEM>, B<-xkeyform> B<DER>|B<PEM>
Extra certificate and private key format respectively.
@@ -353,7 +362,7 @@ Print extensive debugging information including a hex dump of all traffic.
Show all protocol messages with hex dump.
=item B<-msgfile outfile>
=item B<-msgfile> I<outfile>
File to send output of B<-msg> or B<-trace> to, default standard output.
@@ -361,37 +370,21 @@ File to send output of B<-msg> or B<-trace> to, default standard output.
Prints the SSL session states.
=item B<-CAfile infile>
=item B<-CAfile> I<file>, B<-no-CAfile>, B<-CApath> I<dir>, B<-no-CApath>
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.
See L<openssl(1)/Trusted Certificate Options> for more information.
=item B<-CApath dir>
The directory to use for client certificate verification. This directory
must be in "hash format", see L<verify(1)> for more information. These are
also used when building the server certificate chain.
=item B<-chainCApath dir>
=item B<-chainCApath> I<dir>
The directory to use for building the chain provided to the client. This
directory must be in "hash format", see L<verify(1)> for more information.
directory must be in "hash format", see L<openssl-verify(1)> for more
information.
=item B<-chainCAfile file>
=item B<-chainCAfile> I<file>
A file containing trusted certificates to use when attempting to build the
server certificate chain.
=item B<-no-CAfile>
Do not load the trusted CA certificates from the default file location.
=item B<-no-CApath>
Do not load the trusted CA certificates from the default directory location.
=item B<-nocert>
If this option is set then no certificate is used. This restricts the
@@ -413,7 +406,7 @@ web browser. Cannot be used in conjunction with B<-early_data>.
Emulates a simple web server. Pages will be resolved relative to the
current directory, for example if the URL https://myhost/page.html is
requested the file ./page.html will be loaded. Cannot be used in conjunction
requested the file F<./page.html> will be loaded. Cannot be used in conjunction
with B<-early_data>.
=item B<-tlsextdebug>
@@ -424,30 +417,21 @@ Print a hex dump of any TLS extensions received from the server.
Emulates a simple web server. Pages will be resolved relative to the
current directory, for example if the URL https://myhost/page.html is
requested the file ./page.html will be loaded. The files loaded are
requested the file F<./page.html> will be loaded. The files loaded are
assumed to contain a complete and correct HTTP response (lines that
are part of the HTTP response line and headers must end with CRLF). Cannot be
used in conjunction with B<-early_data>.
=item B<-id_prefix val>
=item B<-id_prefix> I<val>
Generate SSL/TLS session IDs prefixed by B<val>. This is mostly useful
Generate SSL/TLS session IDs prefixed by I<val>. This is mostly useful
for testing any SSL/TLS code (eg. proxies) that wish to deal with multiple
servers, when each of which might be generating a unique range of session
IDs (eg. with a certain prefix).
=item B<-rand file...>
=item B<-rand> I<files>, B<-writerand> I<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 B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
all others.
=item [B<-writerand file>]
Writes random data to the specified I<file> upon exit.
This can be used with a subsequent B<-rand> flag.
See L<openssl(1)/Random State Options> for more information.
=item B<-verify_return_error>
@@ -464,17 +448,17 @@ Enables certificate status request support (aka OCSP stapling).
Enables certificate status request support (aka OCSP stapling) and gives
a verbose printout of the OCSP response.
=item B<-status_timeout int>
=item B<-status_timeout> I<int>
Sets the timeout for OCSP response to B<int> seconds.
Sets the timeout for OCSP response to I<int> seconds.
=item B<-status_url val>
=item B<-status_url> I<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.
=item B<-status_file infile>
=item B<-status_file> I<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.
@@ -502,12 +486,12 @@ asynchronously. This will only have an effect if an asynchronous capable engine
is also used via the B<-engine> option. For test purposes the dummy async engine
(dasync) can be used (if available).
=item B<-max_send_frag +int>
=item B<-max_send_frag> I<+int>
The maximum size of data fragment to send.
See L<SSL_CTX_set_max_send_fragment(3)> for further information.
=item B<-split_send_frag +int>
=item B<-split_send_frag> I<+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
@@ -516,14 +500,14 @@ a suitable cipher suite has been negotiated, an engine that supports pipelining
has been loaded, and max_pipelines is greater than 1. See
L<SSL_CTX_set_split_send_fragment(3)> for further information.
=item B<-max_pipelines +int>
=item B<-max_pipelines> I<+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 L<SSL_CTX_set_max_pipelines(3)> for further information.
=item B<-read_buf +int>
=item B<-read_buf> I<+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
@@ -533,8 +517,8 @@ further information).
=item B<-ssl2>, B<-ssl3>, B<-tls1>, B<-tls1_1>, B<-tls1_2>, B<-tls1_3>, B<-no_ssl2>, B<-no_ssl3>, B<-no_tls1>, B<-no_tls1_1>, B<-no_tls1_2>, B<-no_tls1_3>
These options require or disable the use of the specified SSL or TLS protocols.
By default B<s_server> will negotiate the highest mutually supported protocol
version.
By default, this command will negotiate the highest mutually supported
protocol version.
When a specific TLS 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
@@ -581,44 +565,44 @@ Prioritize ChaCha ciphers when preferred by clients. Requires B<-serverpref>.
Set the B<SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION> option.
=item B<-client_sigalgs val>
=item B<-client_sigalgs> I<val>
Signature algorithms to support for client certificate authentication
(colon-separated list).
=item B<-named_curve val>
=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 val>
=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
the B<ciphers> command for more information.
L<openssl-ciphers(1)> for more information.
=item B<-ciphersuites val>
=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
the B<ciphers> command for more information. The format for this list is a
simple colon (":") separated list of TLSv1.3 ciphersuite names.
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 infile>
=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 the B<s_server>
program will be used.
If this fails then a static set of parameters hard coded into this command
will be used.
=item B<-attime>, B<-check_ss_sig>, B<-crl_check>, B<-crl_check_all>,
B<-explicit_policy>, B<-extended_crl>, B<-ignore_critical>, B<-inhibit_any>,
@@ -629,7 +613,7 @@ B<-auth_level>, B<-verify_depth>, B<-verify_email>, B<-verify_hostname>,
B<-verify_ip>, B<-verify_name>, B<-x509_strict>
Set different peer certificate verification options.
See the L<verify(1)> manual page for details.
See the L<openssl-verify(1)> manual page for details.
=item B<-crl_check>, B<-crl_check_all>
@@ -641,44 +625,45 @@ option all CRLs of all CAs in the chain are checked.
Turns on non blocking I/O.
=item B<-psk_identity val>
=item B<-psk_identity> I<val>
Expect the client to send PSK identity B<val> when using a PSK
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 val>
=item B<-psk_hint> I<val>
Use the PSK identity hint B<val> when using a PSK cipher suite.
Use the PSK identity hint I<val> when using a PSK cipher suite.
=item B<-psk val>
=item B<-psk> I<val>
Use the PSK key B<val> when using a PSK cipher suite. The key is
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 file>
=item B<-psk_session> I<file>
Use the pem encoded SSL_SESSION data stored in B<file> as the basis of a PSK.
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 B<s_server> will listen on a UDP port for incoming connections.
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 B<s_server> will connect to
that peer and complete the handshake.
If a ClientHello with a cookie is received then this command will
connect to that peer and complete the handshake.
=item B<-dtls>, B<-dtls1>, B<-dtls1_2>
These options make B<s_server> use DTLS protocols instead of TLS.
With B<-dtls>, B<s_server> will negotiate any supported DTLS protocol version,
whilst B<-dtls1> and B<-dtls1_2> will only support DTLSv1.0 and DTLSv1.2
respectively.
These options make this command use DTLS protocols instead of TLS.
With B<-dtls>, it will negotiate any supported DTLS protocol
version, whilst B<-dtls1> and B<-dtls1_2> will only support DTLSv1.0 and
DTLSv1.2 respectively.
=item B<-sctp>
@@ -699,30 +684,30 @@ available where OpenSSL has support for SCTP enabled.
If this option is set then no DH parameters will be loaded effectively
disabling the ephemeral DH cipher suites.
=item B<-alpn val>, B<-nextprotoneg val>
=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 B<val> list is a comma-separated list of supported protocol
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<-engine val>
=item B<-engine> I<val>
Specifying an engine (by its unique id string in B<val>) will cause B<s_server>
to attempt to obtain a functional reference to the specified engine,
thus initialising it if needed. The engine will then be set as the default
for all available algorithms.
Specifying an engine (by its unique id string in I<val>) will cause
this command 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.
=item B<-keylogfile outfile>
=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 int>
=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>
@@ -804,8 +789,8 @@ Send a certificate request to the client (TLSv1.3 only)
=head1 NOTES
B<s_server> can be used to debug SSL clients. To accept connections from
a web browser the command:
This command can be used to debug SSL clients. To accept connections
from a web browser the command:
openssl s_server -accept 443 -www
@@ -815,20 +800,20 @@ 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 B<sess_id> program.
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 of B<s_server> is rather hard to
read and not a model of how things should be done.
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 the B<s_server> program to print out details of any
unknown cipher suites a client says it 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