diff options
Diffstat (limited to 'crypto/openssl/doc/apps/s_client.pod')
| -rw-r--r-- | crypto/openssl/doc/apps/s_client.pod | 50 |
1 files changed, 47 insertions, 3 deletions
diff --git a/crypto/openssl/doc/apps/s_client.pod b/crypto/openssl/doc/apps/s_client.pod index 4ebf7b585474..b021c730c02a 100644 --- a/crypto/openssl/doc/apps/s_client.pod +++ b/crypto/openssl/doc/apps/s_client.pod @@ -9,7 +9,9 @@ s_client - SSL/TLS client program B<openssl> B<s_client> [B<-connect host:port>] +[B<-servername name>] [B<-verify depth>] +[B<-verify_return_error>] [B<-cert filename>] [B<-certform DER|PEM>] [B<-key filename>] @@ -27,6 +29,7 @@ B<openssl> B<s_client> [B<-nbio>] [B<-crlf>] [B<-ign_eof>] +[B<-no_ign_eof>] [B<-quiet>] [B<-ssl2>] [B<-ssl3>] @@ -36,6 +39,7 @@ B<openssl> B<s_client> [B<-no_tls1>] [B<-bugs>] [B<-cipher cipherlist>] +[B<-serverpref>] [B<-starttls protocol>] [B<-engine id>] [B<-tlsextdebug>] @@ -43,6 +47,8 @@ B<openssl> B<s_client> [B<-sess_out filename>] [B<-sess_in filename>] [B<-rand file(s)>] +[B<-status>] +[B<-nextprotoneg protocols>] =head1 DESCRIPTION @@ -59,6 +65,10 @@ SSL servers. 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<-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 @@ -90,6 +100,11 @@ 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 @@ -166,6 +181,11 @@ input. 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. @@ -199,6 +219,10 @@ 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<-serverpref> + +use the server's cipher preferences; only used for SSLV2. + =item B<-starttls protocol> send the protocol-specific message(s) to switch to TLS for communication. @@ -237,6 +261,22 @@ 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<-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 +reciving ServerHello with a list of server supported protocols. + =back =head1 CONNECTED COMMANDS @@ -286,6 +326,13 @@ 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. +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 @@ -293,9 +340,6 @@ 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<-verify> option should really exit if the server verification -fails. - The B<-prexit> option is a bit of a hack. We should really report information whenever a session is renegotiated. |