=head1 SYNOPSIS
B<openssl> B<s_client>
-[B<-connect> host:port>]
+[B<-connect host:port>]
[B<-verify depth>]
[B<-cert filename>]
+[B<-certform DER|PEM>]
[B<-key filename>]
+[B<-keyform DER|PEM>]
+[B<-pass arg>]
[B<-CApath directory>]
[B<-CAfile filename>]
[B<-reconnect>]
[B<-pause>]
[B<-showcerts>]
[B<-debug>]
+[B<-msg>]
[B<-nbio_test>]
[B<-state>]
[B<-nbio>]
[B<-no_tls1>]
[B<-bugs>]
[B<-cipher cipherlist>]
+[B<-starttls protocol>]
[B<-engine id>]
+[B<-tlsextdebug>]
+[B<-no_ticket>]
+[B<-sess_out filename>]
+[B<-sess_in filename>]
[B<-rand file(s)>]
=head1 DESCRIPTION
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)|openssl(1)>.
+
=item B<-verify depth>
The verify depth to use. This specifies the maximum length of the
A file containing trusted certificates to use during server authentication
and to use when attempting to build the client certificate chain.
+=item B<-purpose, -ignore_critical, -issuer_checks, -crl_check, -crl_check_all, -policy_check, -extended_crl, -x509_strict, -policy -check_ss_sig>
+
+Set various certificate chain valiadition option. See the
+L<B<verify>|verify(1)> manual page for details.
+
=item B<-reconnect>
reconnects to the same server 5 times using the same session ID, this can
print extensive debugging information including a hex dump of all traffic.
+=item B<-msg>
+
+show all protocol messages with hex dump.
+
=item B<-nbio_test>
tests non-blocking I/O
=item B<-quiet>
-inhibit printing of session and certificate information. This implicitely
+inhibit printing of session and certificate information. This implicitly
turns on B<-ign_eof> as well.
+=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<-ssl2>, B<-ssl3>, B<-tls1>, B<-no_ssl2>, B<-no_ssl3>, B<-no_tls1>
these options disable the use of certain SSL or TLS protocols. By default
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", and "ftp".
+
+=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 it's unique B<id> string) will cause B<s_client>
+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.
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 renegociated if the line begins with an
+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.
If the handshake fails then there are several possible causes, if it is
nothing obvious like no client certificate then the B<-bugs>, B<-ssl2>,
-B<-ssl3>, B<-tls1>, B<-no_ssl2>, B<-no_ssl3>, B<-no_tls1> can be tried
+B<-ssl3>, B<-tls1>, B<-no_ssl2>, 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.
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> command and send an HTTP request
+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>
If there are problems verifying a server certificate then the
B<-showcerts> option can be used to show the whole chain.
+Since the SSLv23 client hello cannot include compression methods or extensions
+these will only be supported if its use is disabled, for example by using the
+B<-no_sslv2> option.
+
=head1 BUGS
Because this program has a lot of options and also because some of
projects / openssl.git / blobdiff