merge nginx-hardening role into collection

roles/nginx_hardening/README.md

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+# devsec.nginx_hardening
+
+![devsec.nginx_hardening](https://github.com/dev-sec/ansible-os-hardening/workflows/devsec.nginx_hardening/badge.svg)
+
+## Description
+
+This role provides secure nginx configuration. It is intended to be compliant with the [DevSec Nginx Baseline](https://github.com/dev-sec/nginx-baseline).
+
+It works with the following nginx-roles, including, but not limited to:
+* [geerlingguy.nginx](https://galaxy.ansible.com/geerlingguy/nginx/)
+* [nginxinc.nginx](https://galaxy.ansible.com/nginxinc/nginx)
+* [jdauphant.nginx](https://galaxy.ansible.com/jdauphant/nginx/)
+* [franklinkim.nginx](https://galaxy.ansible.com/franklinkim/nginx/)
+
+**NOTE: This role does not work with nginx 1.0.15 or older! Please use the latest version from the official nginx repositories!**
+
+## Requirements
+
+* Ansible >= 2.9
+
+## Role Variables
+
+* [nginx_client_body_buffer_size][]
+  * Default: `1k`
+  * Description: Sets buffer size for reading client request body. In case the request body is larger than the buffer, the whole body or only its part is written to a temporary file.
+* nginx_remove_default_site
+  * Default: `true`
+  * Description: Disables the default site. Set to false to enable the default site in nginx.
+* [nginx_client_max_body_size][]
+  * Default: `1k`
+  * Description: Sets the maximum allowed size of the client request body, specified in the “Content-Length” request header field. If the size in a request exceeds the configured value, the 41
+3 (Request Entity Too Large) error is returned to the client.
+* [nginx_keepalive_timeout][]
+  * Default: `5 5`
+  * Description: The first parameter sets a timeout during which a keep-alive client connection will stay open on the server side. The zero value disables keep-alive client connections. The op
+tional second parameter sets a value in the “Keep-Alive: timeout=time” response header field.
+* [nginx_server_tokens][]
+  * Default: `off`
+  * Description: Disables emitting nginx version in error messages and in the "Server" response header field. Set to on to enable the nginx version in error messages and "Server" response head
+er.
+* [nginx_client_header_buffer_size][]
+  * Default: `1k`
+  * Description:  Sets buffer size for reading client request header. For most requests, a buffer of 1K bytes is enough.
+* [nginx_large_client_header_buffers][]
+  * Default: `2 1k`
+  * Description: Sets the maximum number and size of buffers used for reading large client request header.
+* [nginx_client_body_timeout][]
+  * Default: `10`
+  * Description: Defines a timeout for reading client request body.
+* [nginx_client_header_timeout][]
+  * Default: `10`
+  * Description: Defines a timeout for reading client request header.
+* [nginx_send_timeout][]
+  * Default: `10`
+  * Description: Sets a timeout for transmitting a response to the client.
+* [nginx_limit_conn_zone][]
+  * Default: `$binary_remote_addr zone=default:10m`
+  * Description: Sets parameters for a shared memory zone that will keep states for various keys.
+* [nginx_limit_conn][]
+  * Default: `default 5`
+  * Description: Sets the shared memory zone and the maximum allowed number of connections for a given key value.
+* [nginx_add_header][]
+  * Default: `[ "X-Frame-Options SAMEORIGIN", "X-Content-Type-Options nosniff", "X-XSS-Protection \"1; mode=block\"" ]`
+  * Description:Adds the specified field to a response header provided that the response code equals 200, 201, 204, 206, 301, 302, 303, 304, or 307.
+* [nginx_ssl_protocols][]
+  * Default: `TLSv1.2`
+  * Description: Specifies the SSL protocol which should be used.
+* [nginx_ssl_ciphers][]
+  * Default: *see defaults.yml*
+  * Description: Specifies the TLS ciphers which should be used.
+* [nginx_ssl_prefer_server_ciphers][]
+  * Default: `on`
+  * Description: Specifies that server ciphers should be preferred over client ciphers when using the TLS protocols. Set to false to disable it.
+* [nginx_dh_size][]
+  * Default: `2048`
+  * Description: Specifies the length of DH parameters for EDH ciphers.
+
+## Example Playbook
+
+```
+- hosts: localhost
+  collections:
+    - devsec.hardening
+  roles:
+    - devsec.nginx_hardening
+```
+
+[nginx_client_body_buffer_size]: http://nginx.org/en/docs/http/ngx_http_core_module.html#client_body_buffer_size
+[nginx_client_max_body_size]: http://nginx.org/en/docs/http/ngx_http_core_module.html#client_max_body_size
+[nginx_keepalive_timeout]: http://nginx.org/en/docs/http/ngx_http_core_module.html#keepalive_timeout
+[nginx_server_tokens]: http://nginx.org/en/docs/http/ngx_http_core_module.html#server_tokens
+[nginx_more_clear_headers]: http://nginx.org/en/docs/http/ngx_http_headers_module.html#add_header
+[nginx_client_header_buffer_size]: http://nginx.org/en/docs/http/ngx_http_core_module.html#client_header_buffer_size
+[nginx_large_client_header_buffers]: http://nginx.org/en/docs/http/ngx_http_core_module.html#large_client_header_buffers
+[nginx_client_body_timeout]: http://nginx.org/en/docs/http/ngx_http_core_module.html#client_body_timeout
+[nginx_client_header_timeout]: http://nginx.org/en/docs/http/ngx_http_core_module.html#client_header_timeout
+[nginx_send_timeout]: http://nginx.org/en/docs/http/ngx_http_core_module.html#send_timeout
+[nginx_limit_conn_zone]: http://nginx.org/en/docs/http/ngx_http_limit_conn_module.html#limit_conn_zone
+[nginx_limit_conn]: http://nginx.org/en/docs/http/ngx_http_limit_conn_module.html#limit_conn
+[nginx_add_header]: http://nginx.org/en/docs/http/ngx_http_headers_module.html#add_header
+[nginx_ssl_protocols]: http://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_protocols
+[nginx_ssl_ciphers]: http://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_ciphers
+[nginx_ssl_prefer_server_ciphers]: http://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_prefer_server_ciphers
+[nginx_dh_size]: http://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_dhparam