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提交 0dc22557 编写于 作者: R Rich Salz 提交者： Rich Salz
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Reviewed-by: NDr. Stephen Henson <steve@openssl.org>
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=pod
=head1 NAME
s_client - SSL/TLS client program
=head1 SYNOPSIS
B<openssl> B<s_client>
[B<-connect host:port>]
[B<-proxy host:port>]
[B<-servername name>]
[B<-verify depth>]
[B<-verify_return_error>]
[B<-cert filename>]
[B<-certform DER|PEM>]
[B<-key filename>]
[B<-keyform DER|PEM>]
[B<-pass arg>]
[B<-CApath directory>]
[B<-CAfile filename>]
[B<-no-CAfile>]
[B<-no-CApath>]
[B<-dane_tlsa_domain domain>]
[B<-dane_tlsa_rrdata rrdata>]
[B<-attime timestamp>]
[B<-check_ss_sig>]
[B<-crl_check>]
[B<-crl_check_all>]
[B<-explicit_policy>]
[B<-extended_crl>]
[B<-ignore_critical>]
[B<-inhibit_any>]
[B<-inhibit_map>]
[B<-issuer_checks>]
[B<-partial_chain>]
[B<-policy arg>]
[B<-policy_check>]
[B<-policy_print>]
[B<-purpose purpose>]
[B<-suiteB_128>]
[B<-suiteB_128_only>]
[B<-suiteB_192>]
[B<-trusted_first>]
[B<-no_alt_chains>]
[B<-use_deltas>]
[B<-verify_depth num>]
[B<-verify_email email>]
[B<-verify_hostname hostname>]
[B<-verify_ip ip>]
[B<-verify_name name>]
[B<-x509_strict>]
[B<-reconnect>]
[B<-showcerts>]
[B<-debug>]
[B<-msg>]
[B<-nbio_test>]
[B<-state>]
[B<-nbio>]
[B<-crlf>]
[B<-ign_eof>]
[B<-no_ign_eof>]
[B<-quiet>]
[B<-ssl3>]
[B<-tls1>]
[B<-no_ssl3>]
[B<-no_tls1>]
[B<-no_tls1_1>]
[B<-no_tls1_2>]
[B<-fallback_scsv>]
[B<-async>]
[B<-bugs>]
[B<-comp>]
[B<-no_comp>]
[B<-cipher cipherlist>]
[B<-serverpref>]
[B<-starttls protocol>]
[B<-xmpphost hostname>]
[B<-engine id>]
[B<-tlsextdebug>]
[B<-no_ticket>]
[B<-sess_out filename>]
[B<-sess_in filename>]
[B<-rand file(s)>]
[B<-serverinfo types>]
[B<-status>]
[B<-nextprotoneg protocols>]
=head1 DESCRIPTION
The B<s_client> command implements a generic SSL/TLS client which connects
to a remote host using SSL/TLS. It is a I<very> useful diagnostic tool for
SSL servers.
=head1 OPTIONS
In addition to the options below the B<s_client> utility also supports the
common and client only options documented in the
in the L<SSL_CONF_cmd(3)|SSL_CONF_cmd(3)/SUPPORTED COMMAND LINE COMMANDS>
manual page.
=over 4
=item B<-connect host:port>
This specifies the host and optional port to connect to. If not specified
then an attempt is made to connect to the local host on port 4433.
=item B<-proxy host:port>
When used with the B<-connect> flag, the program uses the host and port
specified with this flag and issues an HTTP CONNECT command to connect
to the desired server.
=item B<-servername name>
Set the TLS SNI (Server Name Indication) extension in the ClientHello message.
=item B<-cert certname>
The certificate to use, if one is requested by the server. The default is
not to use a certificate.
=item B<-certform format>
The certificate format to use: DER or PEM. PEM is the default.
=item B<-key keyfile>
The private key to use. If not specified then the certificate file will
be used.
=item B<-keyform format>
The private format to use: DER or PEM. PEM is the default.
=item B<-pass arg>
the private key password source. For more information about the format of B<arg>
see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
=item B<-verify depth>
The verify depth to use. This specifies the maximum length of the
server certificate chain and turns on server certificate verification.
Currently the verify operation continues after errors so all the problems
with a certificate chain can be seen. As a side effect the connection
will never fail due to a server certificate verify failure.
=item B<-verify_return_error>
Return verification errors instead of continuing. This will typically
abort the handshake with a fatal error.
=item B<-CApath directory>
The directory to use for server certificate verification. This directory
must be in "hash format", see B<verify> for more information. These are
also used when building the client certificate chain.
=item B<-CAfile file>
A file containing trusted certificates to use during server authentication
and to use when attempting to build the client 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<-dane_tlsa_domain domain>
Enable RFC6698/RFC7671 DANE TLSA authentication and specify the
TLSA base domain which becomes the default SNI hint and the primary
reference identifier for hostname checks. This must be used in
combination with at least one instance of the B<-dane_tlsa_rrdata>
option below.
When DANE authentication succeeds, the diagnostic output will include
the lowest (closest to 0) depth at which a TLSA record authenticated
a chain certificate. When that TLSA record is a "2 1 0" trust
anchor public key that signed (rather than matched) the top-most
certificate of the chain, the result is reported as "TA public key
verified". Otherwise, either the TLSA record "matched TA certificate"
at a positive depth or else "matched EE certificate" at depth 0.
=item B<-dane_tlsa_rrdata rrdata>
Use one or more times to specify the RRDATA fields of the DANE TLSA
RRset associated with the target service. The B<rrdata> value is
specied in "presentation form", that is four whitespace separated
fields that specify the usage, selector, matching type and associated
data, with the last of these encoded in hexadecimal. Optional
whitespace is ignored in the associated data field. For example:
$ openssl s_client -starttls smtp -connect smtp.example.com:25 \
-dane_tlsa_domain smtp.example.com \
-dane_tlsa_rrdata "2 1 1
B111DD8A1C2091A89BD4FD60C57F0716CCE50FEEFF8137CDBEE0326E 02CF362B" \
-dane_tlsa_rrdata "2 1 1
60B87575447DCBA2A36B7D11AC09FB24A9DB406FEE12D2CC90180517 616E8A18"
CONNECTED(00000003)
...
DANE TLSA 2 1 1 matched TA certificate at depth 1
Verified peername: smtp.example.com
...
Verify return code: 0 (ok)
...
=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>,
B<-inhibit_map>, B<-issuer_checks>, B<-partial_chain>, B<-policy>,
B<-policy_check>, B<-policy_print>, B<-purpose>, B<-suiteB_128>,
B<-suiteB_128_only>, B<-suiteB_192>, B<-trusted_first>, B<-no_alt_chains>,
B<-use_deltas>, B<-verify_depth>, B<-verify_email>, B<-verify_hostname>,
B<-verify_ip>, B<-verify_name>, B<-x509_strict>
Set various certificate chain validation options. See the
L<verify(1)> manual page for details.
=item B<-reconnect>
reconnects to the same server 5 times using the same session ID, this can
be used as a test that session caching is working.
=item B<-showcerts>
display the whole server certificate chain: normally only the server
certificate itself is displayed.
=item B<-prexit>
print session information when the program exits. This will always attempt
to print out information even if the connection fails. Normally information
will only be printed out once if the connection succeeds. This option is useful
because the cipher in use may be renegotiated or the connection may fail
because a client certificate is required or is requested only after an
attempt is made to access a certain URL. Note: the output produced by this
option is not always accurate because a connection might never have been
established.
=item B<-state>
prints out the SSL session states.
=item B<-debug>
print extensive debugging information including a hex dump of all traffic.
=item B<-msg>
show all protocol messages with hex dump.
=item B<-trace>
show verbose trace output of protocol messages. OpenSSL needs to be compiled
with B<enable-ssl-trace> for this option to work.
=item B<-msgfile>
file to send output of B<-msg> or B<-trace> to, default standard output.
=item B<-nbio_test>
tests non-blocking I/O
=item B<-nbio>
turns on non-blocking I/O
=item B<-crlf>
this option translated a line feed from the terminal into CR+LF as required
by some servers.
=item B<-ign_eof>
inhibit shutting down the connection when end of file is reached in the
input.
=item B<-quiet>
inhibit printing of session and certificate information. This implicitly
turns on B<-ign_eof> as well.
=item B<-no_ign_eof>
shut down the connection when end of file is reached in the input.
Can be used to override the implicit B<-ign_eof> after B<-quiet>.
=item B<-psk_identity identity>
Use the PSK identity B<identity> when using a PSK cipher suite.
=item B<-psk key>
Use the PSK key B<key> when using a PSK cipher suite. The key is
given as a hexadecimal number without leading 0x, for example -psk
1a2b3c4d.
=item B<-ssl3>, B<-tls1>, B<-no_ssl3>, B<-no_tls1>, B<-no_tls1_1>, B<-no_tls1_2>
these options disable the use of certain SSL or TLS protocols. By default
the initial handshake uses a method which should be compatible with all
servers and permit them to use SSL v3 or TLS as appropriate.
Unfortunately there are still ancient and broken servers in use which
cannot handle this technique and will fail to connect. Some servers only
work if TLS is turned off.
=item B<-fallback_scsv>
Send TLS_FALLBACK_SCSV in the ClientHello.
=item B<-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 B<-engine> option. For test purposes the dummy async engine
(dasync) can be used (if available).
=item B<-bugs>
there are several known bug in SSL and TLS implementations. Adding this
option enables various workarounds.
=item B<-comp>
Enables support for SSL/TLS compression.
This option was introduced in OpenSSL 1.1.0.
TLS compression is not recommended and is off by default as of
OpenSSL 1.1.0.
=item B<-no_comp>
Disables support for SSL/TLS compression.
TLS compression is not recommended and is off by default as of
OpenSSL 1.1.0.
=item B<-brief>
only provide a brief summary of connection parameters instead of the
normal verbose output.
=item B<-cipher cipherlist>
this allows the cipher list sent by the client to be modified. Although
the server determines which cipher suite is used it should take the first
supported cipher in the list sent by the client. See the B<ciphers>
command for more information.
=item B<-starttls protocol>
send the protocol-specific message(s) to switch to TLS for communication.
B<protocol> is a keyword for the intended protocol. Currently, the only
supported keywords are "smtp", "pop3", "imap", "ftp", "xmpp", "xmpp-server",
and "irc."
=item B<-xmpphost hostname>
This option, when used with "-starttls xmpp" or "-starttls xmpp-server",
specifies the host for the "to" attribute of the stream element.
If this option is not specified, then the host specified with "-connect"
will be used.
=item B<-tlsextdebug>
print out a hex dump of any TLS extensions received from the server.
=item B<-no_ticket>
disable RFC4507bis session ticket support.
=item B<-sess_out filename>
output SSL session to B<filename>
=item B<-sess_in sess.pem>
load SSL session from B<filename>. The client will attempt to resume a
connection from this session.
=item B<-engine id>
specifying an engine (by its unique B<id> string) will cause B<s_client>
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<-rand file(s)>
a file or files containing random data used to seed the random number
generator, or an EGD socket (see L<RAND_egd(3)>).
Multiple files can be specified separated by a OS-dependent character.
The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
all others.
=item B<-serverinfo types>
a list of comma-separated TLS Extension Types (numbers between 0 and
65535). Each type will be sent as an empty ClientHello TLS Extension.
The server's response (if any) will be encoded and displayed as a PEM
file.
=item B<-status>
sends a certificate status request to the server (OCSP stapling). The server
response (if any) is printed out.
=item B<-nextprotoneg protocols>
enable Next Protocol Negotiation TLS extension and provide a list of
comma-separated protocol names that the client should advertise
support for. The list should contain most wanted protocols first.
Protocol names are printable ASCII strings, for example "http/1.1" or
"spdy/3".
Empty list of protocols is treated specially and will cause the client to
advertise support for the TLS extension but disconnect just after
receiving ServerHello with a list of server supported protocols.
=back
=head1 CONNECTED COMMANDS
If a connection is established with an SSL server then any data received
from the server is displayed and any key presses will be sent to the
server. When used interactively (which means neither B<-quiet> nor B<-ign_eof>
have been given), the session will be renegotiated if the line begins with an
B<R>, and if the line begins with a B<Q> or if end of file is reached, the
connection will be closed down.
=head1 NOTES
B<s_client> can be used to debug SSL servers. To connect to an SSL HTTP
server the command:
openssl s_client -connect servername:443
would typically be used (https uses port 443). If the connection succeeds
then an HTTP command can be given such as "GET /" to retrieve a web page.
If the handshake fails then there are several possible causes, if it is
nothing obvious like no client certificate then the B<-bugs>,
B<-ssl3>, B<-tls1>, B<-no_ssl3>, B<-no_tls1> options can be tried
in case it is a buggy server. In particular you should play with these
options B<before> submitting a bug report to an OpenSSL mailing list.
A frequent problem when attempting to get client certificates working
is that a web client complains it has no certificates or gives an empty
list to choose from. This is normally because the server is not sending
the clients certificate authority in its "acceptable CA list" when it
requests a certificate. By using B<s_client> the CA list can be viewed
and checked. However some servers only request client authentication
after a specific URL is requested. To obtain the list in this case it
is necessary to use the B<-prexit> option and send an HTTP request
for an appropriate page.
If a certificate is specified on the command line using the B<-cert>
option it will not be used unless the server specifically requests
a client certificate. Therefor merely including a client certificate
on the command line is no guarantee that the certificate works.
If there are problems verifying a server certificate then the
B<-showcerts> option can be used to show the whole chain.
The B<s_client> utility is a test tool and is designed to continue the
handshake after any certificate verification errors. As a result it will
accept any certificate chain (trusted or not) sent by the peer. None test
applications should B<not> do this as it makes them vulnerable to a MITM
attack. This behaviour can be changed by with the B<-verify_return_error>
option: any verify errors are then returned aborting the handshake.
=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 s_client is rather
hard to read and not a model of how things should be done. A typical
SSL client program would be much simpler.
The B<-prexit> option is a bit of a hack. We should really report
information whenever a session is renegotiated.
=head1 SEE ALSO
L<sess_id(1)>, L<s_server(1)>, L<ciphers(1)>
=head1 HISTORY
The -no_alt_chains options was first added to OpenSSL 1.1.0.
=cut
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=pod
=head1 NAME
s_server - SSL/TLS server program
=head1 SYNOPSIS
B<openssl> B<s_server>
[B<-accept port>]
[B<-naccept count>]
[B<-context id>]
[B<-verify depth>]
[B<-Verify depth>]
[B<-crl_check>]
[B<-crl_check_all>]
[B<-cert filename>]
[B<-certform DER|PEM>]
[B<-key keyfile>]
[B<-keyform DER|PEM>]
[B<-pass arg>]
[B<-dcert filename>]
[B<-dcertform DER|PEM>]
[B<-dkey keyfile>]
[B<-dkeyform DER|PEM>]
[B<-dpass arg>]
[B<-dhparam filename>]
[B<-nbio>]
[B<-nbio_test>]
[B<-crlf>]
[B<-debug>]
[B<-msg>]
[B<-state>]
[B<-CApath directory>]
[B<-CAfile filename>]
[B<-no-CAfile>]
[B<-no-CApath>]
[B<-attime timestamp>]
[B<-check_ss_sig>]
[B<-explicit_policy>]
[B<-extended_crl>]
[B<-ignore_critical>]
[B<-inhibit_any>]
[B<-inhibit_map>]
[B<-issuer_checks>]
[B<-partial_chain>]
[B<-policy arg>]
[B<-policy_check>]
[B<-policy_print>]
[B<-purpose purpose>]
[B<-suiteB_128>]
[B<-suiteB_128_only>]
[B<-suiteB_192>]
[B<-trusted_first>]
[B<-no_alt_chains>]
[B<-use_deltas>]
[B<-verify_depth num>]
[B<-verify_return_error>]
[B<-verify_email email>]
[B<-verify_hostname hostname>]
[B<-verify_ip ip>]
[B<-verify_name name>]
[B<-x509_strict>]
[B<-nocert>]
[B<-cipher cipherlist>]
[B<-serverpref>]
[B<-quiet>]
[B<-ssl3>]
[B<-tls1>]
[B<-dtls>]
[B<-dtls1>]
[B<-dtls1_2>]
[B<-listen>]
[B<-async>]
[B<-no_ssl3>]
[B<-no_tls1>]
[B<-no_dhe>]
[B<-bugs>]
[B<-comp>]
[B<-no_comp>]
[B<-brief>]
[B<-www>]
[B<-WWW>]
[B<-HTTP>]
[B<-engine id>]
[B<-tlsextdebug>]
[B<-no_ticket>]
[B<-id_prefix arg>]
[B<-rand file(s)>]
[B<-serverinfo file>]
[B<-no_resumption_on_reneg>]
[B<-status>]
[B<-status_verbose>]
[B<-status_timeout nsec>]
[B<-status_url url>]
[B<-nextprotoneg protocols>]
=head1 DESCRIPTION
The B<s_server> 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
L<SSL_CONF_cmd(3)|SSL_CONF_cmd(3)/SUPPORTED COMMAND LINE COMMANDS> manual
page.
=over 4
=item B<-accept port>
the TCP port to listen on for connections. If not specified 4433 is used.
=item B<-naccept count>
The server will exit after receiving B<number> connections, default unlimited.
=item B<-context id>
sets the SSL context id. It can be given any string value. If this option
is not present a default value will be used.
=item B<-cert certname>
The certificate to use, most servers cipher suites require the use of a
certificate and some require a certificate with a certain public key type:
for example the DSS cipher suites require a certificate containing a DSS
(DSA) key. If not specified then the filename "server.pem" will be used.
=item B<-certform format>
The certificate format to use: DER or PEM. PEM is the default.
=item B<-key keyfile>
The private key to use. If not specified then the certificate file will
be used.
=item B<-keyform format>
The private format to use: DER or PEM. PEM is the default.
=item B<-pass arg>
the private key password source. For more information about the format of B<arg>
see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)>.
=item B<-dcert filename>, B<-dkey keyname>
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
if they are not specified (no additional certificate and key is used). As
noted above some cipher suites require a certificate containing a key of
a certain type. Some cipher suites need a certificate carrying an RSA key
and some a DSS (DSA) key. By using RSA and DSS certificates and keys
a server can support clients which only support RSA or DSS cipher suites
by using an appropriate certificate.
=item B<-dcertform format>, B<-dkeyform format>, B<-dpass arg>
additional certificate and private key format and passphrase respectively.
=item B<-nocert>
if this option is set then no certificate is used. This restricts the
cipher suites available to the anonymous ones (currently just anonymous
DH).
=item B<-dhparam filename>
the DH parameter file to use. The ephemeral DH cipher suites generate keys
using a set of DH parameters. If not specified then an attempt is made to
load the parameters from the server certificate file. If this fails then
a static set of parameters hard coded into the s_server program will be used.
=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<-crl_check>, B<-crl_check_all>
Check the peer certificate has not been revoked by its CA.
The CRL(s) are appended to the certificate file. With the B<-crl_check_all>
option all CRLs of all CAs in the chain are checked.
=item B<-CApath directory>
The directory to use for client certificate verification. This directory
must be in "hash format", see B<verify> for more information. These are
also used when building the server certificate chain.
=item B<-CAfile file>
A file containing trusted certificates to use during client authentication
and to use when attempting to build the server certificate chain. The list
is also used in the list of acceptable client CAs passed to the client when
a certificate is requested.
=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<-verify depth>, B<-Verify depth>
The verify depth to use. This specifies the maximum length of the
client certificate chain and makes the server request a certificate from
the client. With the B<-verify> option a certificate is requested but the
client does not have to send one, with the B<-Verify> option the client
must supply a certificate or an error occurs.
If the ciphersuite cannot request a client certificate (for example an
anonymous ciphersuite or PSK) this option has no effect.
=item B<-attime>, B<-check_ss_sig>, B<explicit_policy>, B<-extended_crl>,
B<-ignore_critical>, B<-inhibit_any>, B<-inhibit_map>, B<-issuer_checks>,
B<-partial_chain>, B<-policy>, B<-policy_check>, B<-policy_print>, B<-purpose>,
B<-suiteB_128>, B<-suiteB_128_only>, B<-suiteB_192>, B<-trusted_first>,
B<-no_alt_chains>, B<-use_deltas>, 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.
=item B<-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.
=item B<-state>
prints out the SSL session states.
=item B<-debug>
print extensive debugging information including a hex dump of all traffic.
=item B<-msg>
show all protocol messages with hex dump.
=item B<-trace>
show verbose trace output of protocol messages. OpenSSL needs to be compiled
with B<enable-ssl-trace> for this option to work.
=item B<-msgfile>
file to send output of B<-msg> or B<-trace> to, default standard output.
=item B<-nbio_test>
tests non blocking I/O
=item B<-nbio>
turns on non blocking I/O
=item B<-crlf>
this option translated a line feed from the terminal into CR+LF.
=item B<-quiet>
inhibit printing of session and certificate information.
=item B<-psk_hint hint>
Use the PSK identity hint B<hint> when using a PSK cipher suite.
=item B<-psk key>
Use the PSK key B<key> when using a PSK cipher suite. The key is
given as a hexadecimal number without leading 0x, for example -psk
1a2b3c4d.
=item B<-ssl3>, B<-tls1>, B<-no_ssl3>, B<-no_tls1>
these options disable the use of certain SSL or TLS protocols. By default
the initial handshake uses a method which should be compatible with all
servers and permit them to use SSL v3 or TLS as appropriate.
=item B<-dtls>, B<-dtls1>, B<-dtls1_2>
these options make s_server use DTLS protocols instead of TLS. With B<-dtls>
s_server will negotiate any supported DTLS protcol version, whilst B<-dtls1> and
B<-dtls1_2> will only support DTLS1.0 and DTLS1.2 respectively.
=item B<-listen>
this option can only be used in conjunction with one of the DTLS options above.
With this option s_server 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 s_server
will connect to that peer and complete the handshake.
=item B<-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 B<-engine> option. For test purposes the dummy async engine
(dasync) can be used (if available).
=item B<-bugs>
there are several known bug in SSL and TLS implementations. Adding this
option enables various workarounds.
=item B<-comp>
Enable negotiation of TLS compression.
This option was introduced in OpenSSL 1.1.0.
TLS compression is not recommended and is off by default as of
OpenSSL 1.1.0.
=item B<-no_comp>
Disable negotiation of TLS compression.
TLS compression is not recommended and is off by default as of
OpenSSL 1.1.0.
=item B<-brief>
only provide a brief summary of connection parameters instead of the
normal verbose output.
=item B<-cipher cipherlist>
this allows the cipher list used by the server to be modified. When
the client sends a list of supported ciphers the first client cipher
also included in the server list is used. Because the client specifies
the preference order, the order of the server cipherlist irrelevant. See
the B<ciphers> command for more information.
=item B<-serverpref>
use the server's cipher preferences, rather than the client's preferences.
=item B<-tlsextdebug>
print out a hex dump of any TLS extensions received from the server.
=item B<-no_ticket>
disable RFC4507bis session ticket support.
=item B<-www>
sends a status message back to the client when it connects. This includes
lots of information about the ciphers used and various session parameters.
The output is in HTML format so this option will normally be used with a
web browser.
=item B<-WWW>
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.
=item B<-HTTP>
emulates a simple web server. Pages will be resolved relative to the
current directory, for example if the URL https://myhost/page.html is
requested the file ./page.html will be 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).
=item B<-rev>
simple test server which just reverses the text received from the client
and sends it back to the server. Also sets B<-brief>.
=item B<-engine id>
specifying an engine (by its unique B<id> string) 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.
=item B<-id_prefix arg>
generate SSL/TLS session IDs prefixed by B<arg>. This is mostly useful
for testing any SSL/TLS code (eg. proxies) that wish to deal with multiple
servers, when each of which might be generating a unique range of session
IDs (eg. with a certain prefix).
=item B<-rand file(s)>
a file or files containing random data used to seed the random number
generator, or an EGD socket (see L<RAND_egd(3)>).
Multiple files can be specified separated by a OS-dependent character.
The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
all others.
=item B<-serverinfo file>
a file containing one or more blocks of PEM data. Each PEM block
must encode a TLS ServerHello extension (2 bytes type, 2 bytes length,
followed by "length" bytes of extension data). If the client sends
an empty TLS ClientHello extension matching the type, the corresponding
ServerHello extension will be returned.
=item B<-no_resumption_on_reneg>
set SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION flag.
=item B<-status>
enables certificate status request support (aka OCSP stapling).
=item B<-status_verbose>
enables certificate status request support (aka OCSP stapling) and gives
a verbose printout of the OCSP response.
=item B<-status_timeout nsec>
sets the timeout for OCSP response to B<nsec> seconds.
=item B<-status_url url>
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<-nextprotoneg protocols>
enable Next Protocol Negotiation TLS extension and provide a
comma-separated list of supported protocol names.
The list should contain most wanted protocols first.
Protocol names are printable ASCII strings, for example "http/1.1" or
"spdy/3".
=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 single letter commands are also recognized which perform special
operations: these 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.
=item B<R>
renegotiate the SSL session and request a client certificate.
=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.
=back
=head1 NOTES
B<s_server> 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.
Most web browsers (in particular Netscape and MSIE) only support RSA cipher
suites, so they cannot connect to servers which don't use a certificate
carrying an RSA key or a version of OpenSSL with RSA disabled.
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.
=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 s_server is rather
hard to read and not a model of how things should be done. A typical
SSL server program would be much simpler.
The output of common ciphers is wrong: it just gives the list of ciphers that
OpenSSL recognizes and the client supports.
There should be a way for the B<s_server> program to print out details of any
unknown cipher suites a client says it supports.
=head1 SEE ALSO
L<sess_id(1)>, L<s_client(1)>, L<ciphers(1)>
=head1 HISTORY
The -no_alt_chains options was first added to OpenSSL 1.1.0.
=cut
doc/ssl/SSL_CTX_set_mode.pod
浏览文件 @ 0dc22557
......@@ -98,7 +98,6 @@ SSL_CTX_get_mode() and SSL_get_mode() return the current bitmask.
L<ssl(3)>, L<SSL_read(3)>, L<SSL_write(3)>, L<SSL_get_error(3)>
=======
=head1 HISTORY
SSL_MODE_ASYNC was first added to OpenSSL 1.1.0.
......
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