Nginx – Can nginx use different SSL protocols in different server blocks

nginxprotocolssl

I'm trying to setup a hostname to demonstrate a poor SSL config and I'm having some issues. I can specify some bad cipher suites, but nginx seems to ignore the protocol selection. 

server {
    listen 443 spdy ssl;
    keepalive_timeout 70;
    server_name example.co.uk;
    client_max_body_size 10M;

    ssl_certificate /path/to/ssl.crt;
    ssl_certificate_key /path/to/ssl.key;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ...
}

server {
    listen 443 spdy ssl;
    keepalive_timeout 70;
    server_name weak.example.co.uk;
    client_max_body_size 10M;

    ssl_certificate /path/to/weakssl.crt;
    ssl_certificate_key /path/to/weakssl.key;
    ssl_protocols SSLv3;
    ...
}

Nginx can use the different cipher suites I have specified, but seems to use the protocols from the first server block across the board such that weak.example.co.uk has TLSv1/1.1/1.2 and no SSLv3 support.

Is it possible to specify different protocols for each server block?

Best Answer

This seems to be a bug in nginx. I just had this now, took me a while to figure it out.

It's always only using the ssl_protocols directive from the first server block. In my case I have many virtual servers running on the same instance, so I used the nginx -T command to display the full combined config to figure out which server block was the "first" since I have split it up into many separate config files.

At time of writing I'm trying this on Ubuntu 14.04.5 with nginx installed from the ondrej/nginx PPA. Specifically I'm running nginx 1.10.2 built with OpenSSL 1.0.2j.

Output of nginx -V

nginx version: nginx/1.10.2
built with OpenSSL 1.0.2j  26 Sep 2016
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-ipv6 --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_spdy_module --with-http_dav_module --with-http_slice_module --with-threads --with-http_addition_module --with-http_geoip_module=dynamic --with-http_gunzip_module --with-http_gzip_static_module --with-http_image_filter_module=dynamic --with-http_sub_module --with-http_xslt_module=dynamic --with-stream=dynamic --with-stream_ssl_module --with-mail=dynamic --with-mail_ssl_module --add-dynamic-module=/build/nginx-8xB1_y/nginx-1.10.2/debian/modules/nginx-auth-pam --add-dynamic-module=/build/nginx-8xB1_y/nginx-1.10.2/debian/modules/nginx-dav-ext-module --add-dynamic-module=/build/nginx-8xB1_y/nginx-1.10.2/debian/modules/nginx-echo --add-dynamic-module=/build/nginx-8xB1_y/nginx-1.10.2/debian/modules/nginx-upstream-fair --add-dynamic-module=/build/nginx-8xB1_y/nginx-1.10.2/debian/modules/ngx_http_substitutions_filter_module
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