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nginx-1.15.2 version adds the $ssl_preread_protocol variable, through which you can pre-determine whether the connection is an SSL/TLS protocol or a non-SSL/TLS protocol when using the stream reverse proxy, thereby achieving the same Ports to forward different services.
The stream_ssl_preread module checks the initial ClientHello message in an SSL or TLS connection and extracts several values which can be used to manage the connection. The $ssl_preread_protocol variable added in version 1.15.2 captures the latest SSL/TLS version number from the client_version field of the message ClientHello. If the supported_versions extension ClientHello exists in the message, the variable is set to TLSv1.2/TLSv1.3.
Example: Run Nginx on a reverse proxy server and listen to port 443. There are two sets of services on the backend, one is HTTPS (TLS1.2/1.3 enabled) website service, and the other is SSH service. , we need to realize that these two sets of services run on the same port (configured port 443) - the entry request is automatically distinguished by Nginx.
For simplicity, I use the docker environment directly at this time
nginx version
# docker exec -it nginx nginx -V nginx version: nginx/1.15.10 built by gcc 8.2.0 (Alpine 8.2.0) built with OpenSSL 1.1.1b 26 Feb 2019 ...<省略若干行>...
Directory file
# tree ./nginx-with-L4-reuse/./nginx-with-L4-reuse/ ├── config│ └── nginx │ ├── conf.d │ │ └── default.conf │ ├── fastcgi.conf │ ├── fastcgi_params │ ├── mime.types │ └── nginx.conf └── docker-compose.yaml 3 directories, 6 files
docker-compose.yaml
# docker-compose.yaml version: "2.4" services: nginx: container_name: nginx image: nginx:alpine network_mode: host volumes: - ./config/nginx:/etc/nginx/:ro ports: - "443:443" restart: always
nginx.conf
user nginx; worker_processes 2; error_log /var/log/nginx/error.log warn; pid /var/run/nginx.pid; events { worker_connections 1024; } stream { log_format stream '{"@access_time":"$time_iso8601",' '"clientip":"$remote_addr",' '"pid":$pid,' '"pro":"$protocol",' '"ssl_pro": "$ssl_preread_protocol"', '"pro":"$protocol",' '"stus":$status,' '"sent":$bytes_sent,' '"recv":$bytes_received,' '"sess_time":$session_time,' '"up_addr":"$upstream_addr",' '"up_sent":$upstream_bytes_sent,' '"up_recv":$upstream_bytes_received,' '"up_conn_time":$upstream_connect_time,' '"up_resp_time":"$upstream_first_byte_time",' '"up_sess_time":$upstream_session_time}'; upstream ssh { server 192.168.50.212:22; } upstream web { server 192.168.50.215:443; } map $ssl_preread_protocol $upstream { default ssh; "TLSv1.2" web; "TLSv1.3" web; } # SSH and SSL on the same port server { listen 443; proxy_pass $upstream; ssl_preread on; access_log /var/log/nginx/stream_443.log stream; } }
$ssl_preread_protocol implements different business configurations at the IP layer, which is very meaningful for certain needs - although there are functional limitations. However, Tengine-2.3.0 has implemented IP layer based on domain name forwarding. Perhaps this feature will be introduced to Nginx.
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