first Readme version (envoyproxy#11)

* first Readme version

* chore: fixes name

Co-authored-by: José Carlos Chávez <jcchavezs@gmail.com>

README.md

@@ -1 +1,112 @@
-# Coraza WASM filter
+# Coraza Proxy WASM
+
+Web Application Firewall WASM filter built on top of [Coraza](https://github.com/corazawaf/coraza) and implementing on proxy-wasm ABI. It can be loaded directly from Envoy or also used as an Istio plugin.
+
+## Getting started
+`go run mage.go -l` lists all the available commands:
+```
+▶ go run mage.go -l
+Targets:
+  build*             builds the Coraza Wasm plugin.
+  check              runs lint and tests.
+  checkBuildTools
+  coverage           runs tests with coverage and race detector enabled.
+  doc                runs godoc, access at http://localhost:6060
+  e2e                runs e2e tests with a built plugin.
+  format             formats code in this repository.
+  ftw                runs ftw tests with a built plugin and Envoy.
+  lint               verifies code quality.
+  precommit          installs a git hook to run check when committing
+  setup              spins up the test environment.
+  teardown           tears down the test environment.
+  test               runs all tests.
+  updateLibs
+
+* default target
+```
+### Building the filter
+>Note: The build of the Wasm filter currently relies on Go `1.18.*`
+```
+PATH=/opt/homebrew/Cellar/go@1.18/1.18.6/bin:$PATH  GOROOT=/opt/homebrew/Cellar/go@1.18/1.18.6/libexec go run mage.go build
+```
+You will find the WASM plugin under `./build/main.wasm`.
+
+For performance purposes, some libs are built from they C++ implementation. The compiled polyglot wasm libs are already checked in under [./lib/](./lib/). It is possible to rely on the Dockerfiles under [./buildtools/](./buildtools/) if you wish to rebuild them from scratch.
+
+### Running the filter in an Envoy process
+
+In order to run the coraza-wasm-filter we need to spin up an envoy configuration including this as the filter config:
+
+```yaml
+    ...
+
+    filter_chains:
+    - filters:
+        - name: envoy.filters.network.http_connection_manager
+            typed_config:
+            "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
+            stat_prefix: ingress_http
+            codec_type: auto
+            route_config:
+                ...
+            http_filters:
+                - name: envoy.filters.http.wasm
+                typed_config:
+                    "@type": type.googleapis.com/envoy.extensions.filters.http.wasm.v3.Wasm
+                    config:
+                    name: "coraza-filter"
+                    root_id: ""
+                    configuration:
+                        "@type": "type.googleapis.com/google.protobuf.StringValue"
+                        value: |
+                        {
+                            "rules": "SecDebugLogLevel 5 \nSecRuleEngine On \nSecRule REQUEST_URI \"@streq /admin\" \"id:101,phase:1,t:lowercase,deny\""
+                        }
+                    vm_config:
+                        runtime: "envoy.wasm.runtime.v8"
+                        vm_id: "coraza-filter_vm_id"
+                        code:
+                        local:
+                            filename: "build/main.wasm"
+```
+
+### Using CRS
+
+Coreruleset comes embeded in the extension, in order to use it in the config, you just need to include it directly in the rules:
+
+Loading entire coreruleset:
+
+```yaml
+configuration:
+    "@type": "type.googleapis.com/google.protobuf.StringValue"
+    value: |
+    {
+        "rules": "SecDebugLogLevel 5 \nSecRuleEngine On \n Include crs/*.conf"
+    }
+```
+
+Loading some pieces:
+
+```yaml
+configuration:
+    "@type": "type.googleapis.com/google.protobuf.StringValue"
+    value: |
+    {
+        "rules": "SecDebugLogLevel 5 \nSecRuleEngine On \n Include crs/REQUEST-901-INITIALIZATION.conf"
+    }
+```
+
+### Running go-ftw (CRS Regression tests)
+
+The following command runs the [go-ftw](https://github.com/fzipi/go-ftw) test suite against the filter with the CRS fully loaded.
+```
+go run mage.go build
+```
+Take a look at its config file [ftw.yml](./ftw/ftw.yml) for details about tests currently excluded.
+
+### Spinning up the coraza-wasm-filter for manual tests
+Via the commands `setup` and `teardown` you can spin up and tear down the test environment. Envoy with the coraza-wasm filter will be reachable at `localhost:8080`.
+In order to monitor envoy logs while performing requests run:
+```
+docker-compose -f ./ftw/docker-compose.yml logs -f envoy-logs
+```