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|
=encoding utf-8
=head1 NAME
ngx_stream_ssl_preread_module - Module ngx_stream_ssl_preread_module
=head1
The C<ngx_stream_ssl_preread_module> module (1.11.5) allows
extracting information from the
L<ClientHello|https://datatracker.ietf.org/doc/html/rfc5246#section-7.4.1.2>
message without terminating SSLE<sol>TLS,
for example, the server name requested through
L<SNI|https://datatracker.ietf.org/doc/html/rfc6066#section-3>
or protocols advertised in
L<ALPN|https://datatracker.ietf.org/doc/html/rfc7301>.
This module is not built by default, it should be enabled with the
C<--with-stream_ssl_preread_module>
configuration parameter.
=head1 Example Configuration
Selecting an upstream based on server name:
map $ssl_preread_server_name $name {
backend.example.com backend;
default backend2;
}
upstream backend {
server 192.168.0.1:12345;
server 192.168.0.2:12345;
}
upstream backend2 {
server 192.168.0.3:12345;
server 192.168.0.4:12345;
}
server {
listen 12346;
proxy_pass $name;
ssl_preread on;
}
Selecting an upstream based on protocol:
map $ssl_preread_alpn_protocols $proxy {
~\bh2\b 127.0.0.1:8001;
~\bhttp/1.1\b 127.0.0.1:8002;
~\bxmpp-client\b 127.0.0.1:8003;
}
server {
listen 9000;
proxy_pass $proxy;
ssl_preread on;
}
Selecting an upstream based on SSL protocol version:
map $ssl_preread_protocol $upstream {
"" ssh.example.com:22;
"TLSv1.2" new.example.com:443;
default tls.example.com:443;
}
# ssh and https on the same port
server {
listen 192.168.0.1:443;
proxy_pass $upstream;
ssl_preread on;
}
=head1 Directives
=head2 ssl_preread
B<syntax:> ssl_preread I<C<on> E<verbar> C<off>>
B<default:> I<off>
B<context:> I<stream>
B<context:> I<server>
Enables extracting information from the ClientHello message at
the L<preread|stream_processing> phase.
=head1 Embedded Variables
=over
=item C<$ssl_preread_protocol>
the highest SSL protocol version supported by the client (1.15.2)
=item C<$ssl_preread_server_name>
server name requested through SNI
=item C<$ssl_preread_alpn_protocols>
list of protocols advertised by the client through ALPN (1.13.10).
The values are separated by commas.
=back
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