add support for custom alerters

salt/elastalert/defaults.yaml

@@ -1,5 +1,6 @@
 elastalert:
   enabled: False
+  alerter_parameters: ""
   config:
     rules_folder: /opt/elastalert/rules/
     scan_subdirectories: true

salt/elastalert/map.jinja

@@ -13,3 +13,8 @@
 {% do ELASTALERTDEFAULTS.elastalert.config.update({'es_password': pillar.elasticsearch.auth.users.so_elastic_user.pass}) %}
 
 {% set ELASTALERTMERGED = salt['pillar.get']('elastalert', ELASTALERTDEFAULTS.elastalert, merge=True) %}
+
+{% set params = ELASTALERTMERGED.alerter_parameters | load_yaml %}
+{% if params != None %}
+  {% do ELASTALERTMERGED.config.update(params) %}
+{% endif %}

salt/elastalert/soc_elastalert.yaml

@@ -2,6 +2,14 @@ elastalert:
   enabled:
     description: You can enable or disable Elastalert.
     helpLink: elastalert.html
+  alerter_parameters:
+    title: Alerter Parameters
+    description: Custom configuration parameters for additional, optional alerters that can be enabled for all Sigma rules. Filter for 'Additional Alerters' in this Configuration screen to find the setting that allows these alerters to be enabled within the SOC ElastAlert module. Use YAML format for these parameters, and reference the ElastAlert 2 documentation, located at https://elastalert2.readthedocs.io, for available alerters and their required configuration parameters.
+    global: True
+    multiline: True
+    syntax: yaml
+    helpLink: elastalert.html
+    forcedType: string
   config:
     disable_rules_on_error:
       description: Disable rules on failure.

salt/soc/soc_soc.yaml

@@ -83,6 +83,13 @@ soc:
         advanced: True
       modules:
         elastalertengine:
+          additionalAlerters:
+            title: Additional Alerters
+            description: Specify additional alerters to enable for all Sigma rules, one alerter name per line. Alerters refers to ElastAlert 2 alerters, as documented at https://elastalert2.readthedocs.io. Note that the configuration parameters for these alerters must be provided in the ElastAlert configuration section. Filter for 'Alerter Parameters' to find this related setting.
+            global: True
+            helpLink: sigma.html
+            forcedType: "[]string"
+            multiline: True
           allowRegex:
             description: 'Regex used to filter imported Sigma rules. Deny regex takes precedence over the Allow regex setting.'
             global: True