environment variable parsing in http plugin

[fgeck]

I store my crowdsec configuration in a github respository. For notifications I use http plugin to push data to my telegram bot, but the issue relates to any http plugin which pushes data using credentials to authenticate.

In the format section I can already use sprig env function to substitue env vars (see below).

To not be forced to store my credentials in the notifications/http.yaml file I would like to use environment variables in the http plugin which will be resolved.

Example:

type: http # Don't change
name: http_default # Must match the registered plugin in the profile

# One of "trace", "debug", "info", "warn", "error", "off"
log_level: info

# group_wait: 30s # Time to wait collecting alerts before relaying a message to this plugin, eg "30s"
# group_threshold:    # Amount of alerts that triggers a message before <group_wait> has expired, eg "10"
# max_retry:          # Number of attempts to relay messages to plugins in case of error
# timeout:            # Time to wait for response from the plugin before considering the attempt a failure, eg "10s"

#-------------------------
# plugin-specific options

# The following template receives a list of models.Alert objects
# The output goes in the http request body

# Replace XXXXXXXXX with your Telegram chat ID
format: |
  {
   "chat_id": "{{ env "TELEGRAM_CHAT_ID" }}", 
   "text": "
     {{range . -}}  
     {{$alert := . -}}  
     {{range .Decisions -}}
     {{.Value}} will get {{.Type}} for next {{.Duration}} for triggering {{.Scenario}}.
     {{end -}}
     {{end -}}
   ",
   "reply_markup": {
      "inline_keyboard": [
          {{ $arrLength := len . -}}
          {{ range $i, $value := . -}}
          {{ $V := $value.Source.Value -}}
          [
              {
                  "text": "See {{ $V }} on shodan.io",
                  "url": "https://www.shodan.io/host/{{ $V -}}"
              },
              {
                  "text": "See {{ $V }} on crowdsec.net",
                  "url": "https://app.crowdsec.net/cti/{{ $V -}}"
              }
          ]{{if lt $i ( sub $arrLength 1) }},{{end }}
      {{end -}}
      ]
  }

url: https://api.telegram.org/{TELEGRAM_BOT_KEY}/sendMessage

method: POST
headers:
  Content-Type: "application/json"

Why is this needed?

• Security improvement for users that store crowdsec configuration in a github repository as they can use environment variables to substitute credentials in their configuration yaml files

[github-actions[bot]]

@fgeck: Thanks for opening an issue, it is currently awaiting triage.

In the meantime, you can:

1. Check Crowdsec Documentation to see if your issue can be self resolved.
2. You can also join our Discord.
3. Check Releases to make sure your agent is on the latest version.

Details

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[github-actions[bot]]

@fgeck: There are no 'kind' label on this issue. You need a 'kind' label to start the triage process.

• /kind feature
• /kind enhancement
• /kind bug
• /kind packaging

Details

I am a bot created to help the [crowdsecurity](https://github.com/crowdsecurity) developers manage community feedback and contributions. You can check out my [manifest file](https://github.com/crowdsecurity/crowdsec/blob/master/.github/governance.yml) to understand my behavior and what I can do. If you want to use this for your project, you can check out the [BirthdayResearch/oss-governance-bot](https://github.com/BirthdayResearch/oss-governance-bot) repository.