Nginx configuration for securedrop.propublica.org. (Based on Ubuntu 13.10 / Nginx 1.4.1 default config.)

nginx.conf

# This configuration file is provided on an "as is" basis,
# with no warranties or representations, and any use of it
# is at the user's own risk.
#
# You will need to edit domain name information, IP addresses for
# redirection (at the bottom), SSL certificate and key paths, and
# the "Public-Key-Pins" header. Search for any instance of "TODO".

user www-data;
worker_processes 4;
pid /run/nginx.pid;

events {
	worker_connections 768;
}

http {
	sendfile on;
	tcp_nopush on;
	tcp_nodelay on;
	keepalive_timeout 65;
	types_hash_max_size 2048;

	include /etc/nginx/mime.types;
	default_type application/octet-stream;

	# Turn off logs
	access_log off;
	error_log off;

	gzip on;
	gzip_disable "msie6";

	#####
	# SSL host
	#####
	server {
		listen 443 ssl;
		server_name securedrop.example.com; # TODO

		# SEE THESE LINKS REGARDING HOW TO CONFIGURE THIS HEADER
		# http://tools.ietf.org/html/draft-ietf-websec-key-pinning-09
		# http://blog.stalkr.net/2011/08/hsts-preloading-public-key-pinning-and.html
		# NOTE: only valid on SSL version of domain
		add_header "Public-Key-Pins" "TODO";

		add_header "Strict-Transport-Security" "max-age=31536000";

		add_header "Cache-Control" "max-age=0, no-cache, no-store, must-revalidate";
		add_header "Pragma" "no-cache";
		add_header "Expires" "-1";
		add_header "X-Frame-Options" "DENY";
		add_header "X-XSS-Protection" "1; mode=block";
		add_header "X-Content-Type-Options" "nosniff";
		add_header "X-Download-Options" "noopen";
		add_header "X-Permitted-Cross-Domain-Policies" "master-only";
		add_header "Content-Security-Policy" "default-src 'self'";
		add_header "X-Content-Security-Policy" "default-src 'self'";
		server_tokens off;

		ssl on;
		ssl_session_cache shared:SSL:5m;
		ssl_session_timeout 5m;
		ssl_certificate_key /path/to/ssl_certificate.key; # TODO
		ssl_certificate /path/to/ssl_certificate.crt; # TODO

		ssl_stapling on;
		ssl_trusted_certificate /path/to/ssl_certificate.crt; # TODO

		# Stronger Diffie-Hellman key exchange, using 4096bit key.
		# (Default is a server-generated 1024bit key.) Comment out
		# if you need to support older than IE8 or Java 7.
		# Create this file with:
		#   openssl dhparam -out /etc/nginx/dhparam4096.pem -rand /dev/urandom 4096
		ssl_dhparam /etc/nginx/dhparam4096.pem;

		###################
		# Disable SSLv2 by not including it in this list.
		# Add SSLv3 back in if you need to support IE6 (or older) clients
		###################
		ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

		###################
		# List of 18 or 19 ciphersuites, in descending security order preference:
		# 12 TLS 1.2 suites, 4 fallbacks with PFS, 3-4 fallbacks for compatibility.
		#
		# Expanded list: https://gist.github.com/mtigas/8591092/raw/gistfile1.txt
		#
		# If you need to support IE WinXP (or older) clients, add "DES-CBC3-SHA"
		# after "kEDH+AES128".
		###################
		ssl_ciphers 'kEECDH+ECDSA+AESGCM kEECDH+AESGCM kEECDH+ECDSA+AES256 kEECDH+ECDSA+AES128 kEECDH+AES256 kEECDH+AES128 kEDH+AESGCM kEDH+AES256 kEDH+AES128 +SHA !aNULL !eNULL !LOW !MD5 !EXP !DSS !PSK !SRP !kECDH !CAMELLIA !RC4 !SEED';
		ssl_prefer_server_ciphers on;

		root /home/ubuntu/html; # TODO
		index index.html index.htm;
		charset utf-8;
	}
	#####
	# domain name redirect virtualhost
	#####
	server {
		# Redirect HTTP access to the HTTPS instance.

		listen 80;
		server_name securedrop.example.com; # TODO
		rewrite ^/(.*) https://securedrop.example.com/$1 permanent; # TODO

		add_header "Strict-Transport-Security" "max-age=31536000";

		add_header "Cache-Control" "max-age=0, no-cache, no-store, must-revalidate";
		add_header "Pragma" "no-cache";
		add_header "Expires" "-1";
		add_header "X-Frame-Options" "DENY";
		add_header "X-XSS-Protection" "1; mode=block";
		add_header "X-Content-Type-Options" "nosniff";
		add_header "X-Download-Options" "noopen";
		add_header "X-Permitted-Cross-Domain-Policies" "master-only";
		add_header "Content-Security-Policy" "default-src 'self'";
		add_header "X-Content-Security-Policy" "default-src 'self'";
		server_tokens off;
	}
	#####
	# other virtualhosts
	#####
	server {
		# Redirect any other plain HTTP access to this server. (Same as above, but
		# without the Strict-Transport-Security header.)

		listen 80;
		# List ALL IPs/hostnames that can get to this machine.
		server_name 127.0.0.1 123.123.123.123; # TODO
		rewrite ^/(.*) https://securedrop.example.com/$1 permanent; # TODO

		add_header "Cache-Control" "max-age=0, no-cache, no-store, must-revalidate";
		add_header "Pragma" "no-cache";
		add_header "Expires" "-1";
		add_header "X-Frame-Options" "DENY";
		add_header "X-XSS-Protection" "1; mode=block";
		add_header "X-Content-Type-Options" "nosniff";
		add_header "X-Download-Options" "noopen";
		add_header "X-Permitted-Cross-Domain-Policies" "master-only";
		add_header "Content-Security-Policy" "default-src 'self'";
		add_header "X-Content-Security-Policy" "default-src 'self'";
		server_tokens off;
	}
}