slack - init work

discord/discord.lua

@@ -24,7 +24,7 @@ function _M.new()
 end
 
 function _M:log(bypass_use_discord)
-	if bypass_use_discord then
+	if not bypass_use_discord then
 		-- Check if discord is activated
 		local check, err = utils.get_variable("USE_DISCORD")
 		if check == nil then

slack/README.md

@@ -0,0 +1,92 @@
+# Slack plugin
+
+<p align="center">
+	<img alt="BunkerWeb Slack diagram" src="https://github.com/bunkerity/bunkerweb-plugins/raw/main/slack/docs/diagram.svg" />
+</p>
+
+This [BunkerWeb](https://www.bunkerweb.io) plugin will automatically send you attack notifications on a Slack channel of your choice using a webhook.
+
+# Table of contents
+
+- [Slack plugin](#slack-plugin)
+- [Table of contents](#table-of-contents)
+- [Prerequisites](#prerequisites)
+- [Setup](#setup)
+- [Settings](#settings)
+
+# Prerequisites
+
+Please read the [plugins section](https://docs.bunkerweb.io/plugins) of the BunkerWeb documentation first.
+
+You will need to setup a Slack webhook URL, you will find more information [here](https://api.slack.com/messaging/webhooks).
+
+# Setup
+
+See the [plugins section](https://docs.bunkerweb.io/plugins) of the BunkerWeb documentation for the installation procedure depending on your integration.
+
+There is no additional services to setup besides the plugin itself.
+
+## Docker
+
+```yaml
+version: '3'
+
+services:
+
+  bunkerweb:
+    image: bunkerity/bunkerweb:1.4.1
+    ...
+    environment:
+      - USE_SLACK=yes
+      - SLACK_WEBHOOK_URL=https://api.slack.com/messaging/webhooks/...
+    ...
+```
+
+## Swarm
+
+```yaml
+version: '3.5'
+
+services:
+
+  mybunker:
+    image: bunkerity/bunkerweb:1.4.1
+    ...
+    environment:
+      - USE_SLACK=yes
+      - SLACK_WEBHOOK_URL=https://api.slack.com/messaging/webhooks/...
+    ...
+```
+
+## Kubernetes
+
+```yaml
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: ingress
+  annotations:
+    bunkerweb.io/USE_SLACK: "yes"
+    bunkerweb.io/SLACK_WEBHOOK_URL: "https://api.slack.com/messaging/webhooks/..."
+...
+```
+
+# Settings
+
+| Setting | Default | Description |
+| :-----: | :-----: | :---------- |
+| `USE_SLACK` | `no` | When set to `yes`, notifications of denied requests will be sent to a Slack webhook. |
+| `SLACK_WEBHOOK_URL` | `https://api.slack.com/messaging/webhooks/...` | Address of the Slack webhook where notifications will be sent to. |
+| `SLACK_RETRY_IF_LIMITED` | `no` | Slack is applying a rate-limit ton their API. When this settings is set to `yes`, the plugin will retry to send the notification later. It may consumes some resources if you are under heavy attacks by the way. |
+
+# TODO
+
+* Add more info in notification :
+  * Date
+  * Country of IP
+  * ASN of IP
+  * ...
+* Add settings to control what details to send :
+  * Anonymize IP
+  * Add body
+  * Add headers

slack/docs/diagram.drawio

@@ -0,0 +1 @@
+<mxfile host="app.diagrams.net" modified="2022-06-27T11:34:10.787Z" agent="5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36" etag="5R3u8GQ5zY3JOuKGN8ec" version="20.0.3" type="device"><diagram id="To2Da4PRRWEcok_Ws3eM" 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</diagram></mxfile>

slack/plugin.json

@@ -0,0 +1,36 @@
+{
+	"id": "slack",
+	"order": 999,
+	"name": "Slack",
+	"description": "Send alerts to a Slack channel (using webhooks).",
+	"version": "0.1",
+	"settings": {
+		"USE_SLACK": {
+			"context": "multisite",
+			"default": "no",
+			"help": "Enable sending alerts to a Slack channel.",
+			"id": "use-slack",
+			"label": "Use Slack",
+			"regex": "^(yes|no)$",
+			"type": "check"
+		},
+		"SLACK_WEBHOOK_URL": {
+			"context": "global",
+			"default": "https://hooks.slack.com/services/...",
+			"help": "Address of the Slack Webhook.",
+			"id": "slack-webhook-url",
+			"label": "Slack webhook URL",
+			"regex": "^.*$",
+			"type": "text"
+		},
+		"SLACK_RETRY_IF_LIMITED": {
+			"context": "global",
+			"default": "no",
+			"help": "Retry to send the request if Slack API is rate limiting us (may consume a lot of resources).",
+			"id": "slack-retry-if-limited",
+			"label": "Retry if limited by Slack",
+			"regex": "^(yes|no)$",
+			"type": "check"
+		}
+	}
+}

slack/slack.lua

@@ -0,0 +1,117 @@
+local _M        = {}
+_M.__index      = _M
+
+local utils     = require "utils"
+local logger    = require "logger"
+local cjson		= require "cjson"
+local http		= require "resty.http"
+
+function _M.new()
+	local self = setmetatable({}, _M)
+	local value, err = utils.get_variable("SLACK_WEBHOOK_URL", false)
+	if not value then
+		logger.log(ngx.ERR, "SLACK", "error while getting SLACK_WEBHOOK_URL setting : " .. err)
+		return nil, "error while getting SLACK_WEBHOOK_URL setting : " .. err
+	end
+	self.webhook = value
+	local value, err = utils.get_variable("SLACK_RETRY_IF_LIMITED", false)
+	if not value then
+		logger.log(ngx.ERR, "SLACK", "error while getting SLACK_RETRY_IF_LIMITED setting : " .. err)
+		return nil, "error while getting SLACK_RETRY_IF_LIMITED setting : " .. err
+	end
+	self.retry = value
+	return self, nil
+end
+
+function _M:log(bypass_use_slack)
+	if not bypass_use_slack then
+		-- Check if Slack is activated
+		local check, err = utils.get_variable("USE_SLACK")
+		if check == nil then
+			return false, "error while getting variable USE_SLACK (" .. err .. ")"
+		end
+		if check ~= "yes" then
+			return true, "Slack plugin not enabled"
+		end
+	end
+
+	-- Check if request is denied
+	local reason = utils.get_reason()
+	if reason == nil then
+		return true, "request not denied"
+	end
+
+	-- Send request in a timer because cosocket is not allowed in log()
+	local function send(premature, obj, data)
+		local httpc, err = http.new()
+		if not httpc then
+			logger.log(ngx.ERR, "SLACK", "can't instantiate http object : " .. err)
+		end
+		local res, err_http = httpc:request_uri(obj.webhook, {
+			method = "POST",
+			headers = {
+				["Content-Type"] = "application/json",
+				["User-Agent"] = "BunkerWeb/" .. utils.get_version()
+			},
+			body = cjson.encode(data)
+		})	
+		httpc:close()
+		if not res then
+			logger.log(ngx.ERR, "SLACK", "error while sending request : " .. err)
+		end
+		if obj.retry == "yes" and res.status == 429 and res.headers["Retry-After"] then
+			logger.log(ngx.WARN, "SLACK", "Slack API is rate-limiting us, retrying in " .. res.headers["Retry-After"] .. "s")
+			local hdr, err = ngx.timer.at(res.headers["Retry-After"], send, obj, data)
+			if not hdr then
+				logger.log(ngx.ERR, "SLACK", "can't create report timer : " .. err)
+				return
+			end
+			return
+		end
+		if res.status < 200 or res.status > 299 then
+			logger.log(ngx.ERR, "SLACK", "request returned status " .. tostring(res.status))
+			return
+		end
+		logger.log(ngx.INFO, "SLACK", "request sent to webhook")
+	end
+	local data = {}
+	data.text = "```Denied request for IP " .. ngx.var.remote_addr .. " (reason = " .. reason .. ").\n\nRequest data :\n\n" .. ngx.var.request .. "\n"
+	local headers, err = ngx.req.get_headers()
+	if not headers then
+		data.text = data.text .. "error while getting headers : " .. err
+	else
+		for header, value in pairs(headers) do
+			data.text = data.text .. header .. ": " .. value .. "\n"
+		end
+	end
+	data.text = data.text .. "```"
+	local hdr, err = ngx.timer.at(0, send, self, data)
+	if not hdr then
+		return false, "can't create report timer : " .. err
+	end
+	-- Done
+	return true, "created report timer"
+end
+
+function _M:log_default()
+	-- Check if SLACK is activated
+	local check, err = utils.has_variable("USE_SLACK", "yes")
+	if check == nil then
+		return false, "error while checking variable USE_SLACK (" .. err .. ")"
+	end
+	if not check then
+		return true, "Slack plugin not enabled"
+	end
+	-- Check if default server is disabled
+	local check, err = utils.get_variable("DISABLE_DEFAULT_SERVER", false)
+	if check == nil then
+		return false, "error while getting variable DISABLE_DEFAULT_SERVER (" .. err .. ")"
+	end
+	if check ~= "yes" then
+		return true, "default server not disabled"
+	end
+	-- Call log method
+	return self:log(true)
+end
+
+return _M