## About
open-appsec is a machine learning security engine that preemptively and automatically prevent threats against Web Application & APIs.
open-appsec Attachments connect between processes that provide HTTP data and the open-appsec Agent security logic.
An attachment gets HTTP data (URL, Header, Body, Response) from a hosting process and delivers it to an open-appsec process known as HTTP Transaction handler.
To deal with potential issues where the HTTP Transaction handler process is not responding, the Attachment implements a retry mechanism and configurable fail-open/fail-close mechanism.
This repository will host Attachment for different platforms. The first one is the open-appsec attachment for NGINX, implemented as a standard NGINX dynamically loadable module (plugin).
## open-appsec NGINX attachment compilation instructions
The attachment can be compiled to support an existing alpine based nginx server or an nginx/ingress-nginx alpine based docker.
Your compilation environment must be alpine based and contain git, docker, cmake and g++.
Before compiling, ensure the latest development versions of the following libraries:
* PCRE
* libxml2
* zlib
* OpenSSL
* Geoip
```bash
$ apk update
$ apk add pcre-dev libxml2-dev zlib-dev openssl-dev geoip-dev
```
### Compiling the attachment code for an existing nginx server
On your existing nginx server:
1. Run command to extract nginx compilation flags to a file
```bash
$ nginx -V &> /tmp/nginx.ver
```
On your compilation environment:
1. Clone this repository
2. Copy the file created on your nginx server (the previous section) to your compilation environment to the path /tmp/nginx.ver
3. Run Configuration script
4. Run CMake command
5. Run make command
```bash
$ git clone https://github.com/openappsec/attachment.git
$ ./attachments/nginx/ngx_module/nginx_version_configuration.sh --conf /tmp/nginx.ver build_out
$ cmake -DCMAKE_INSTALL_PREFIX=build_out .
$ make install
```
#### NGINX plugin associated libraries
The NGINX plugin uses these libraries: shmem_ipc, compression_utils, and nginx_attachment_util.
They can be found under the `lib` directory in the `
