Extracted SNS topic definition to its own module because it will be r…

.devcontainer/Dockerfile

@@ -8,7 +8,7 @@ ARG TERRAGRUNT_VERSION
 
 # Install packages
 RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
-    && apt-get -y install --no-install-recommends awscli ca-certificates curl git gnupg2 jq make nodejs npm openssh-client python3-pip vim zsh \
+    && apt-get -y install --no-install-recommends awscli build-essential ca-certificates curl git gnupg2 jq libffi-dev make nodejs npm openssh-client python3-dev python3-pip vim zsh \
     && apt-get autoremove -y && apt-get clean -y 
 
 # Install yarn

.github/workflows/terragrunt-apply-production.yml

@@ -95,6 +95,9 @@ jobs:
             redis:
               - 'aws/redis/**'
               - 'env/production/redis/**'
+            sns:
+              - 'aws/sns/**'
+              - 'env/production/sns/**'
             sqs:
               - 'aws/sqs/**'
               - 'env/production/sqs/**'
@@ -120,6 +123,11 @@ jobs:
         working-directory: env/production/sqs
         run: terragrunt apply --terragrunt-non-interactive -auto-approve
 
+      - name: Terragrunt apply sns
+        if: ${{ steps.filter.outputs.sns == 'true' || steps.filter.outputs.common == 'true' }}
+        working-directory: env/production/sns
+        run: terragrunt apply --terragrunt-non-interactive -auto-approve
+
       # Depends on kms
       - name: Terragrunt apply network
         if: ${{ steps.filter.outputs.network == 'true' || steps.filter.outputs.common == 'true' }}

.github/workflows/terragrunt-apply-staging.yml

@@ -87,6 +87,9 @@ jobs:
             redis:
               - 'aws/redis/**'
               - 'env/staging/redis/**'
+            sns:
+              - 'aws/sns/**'
+              - 'env/staging/sns/**'
             sqs:
               - 'aws/sqs/**'
               - 'env/staging/sqs/**'
@@ -112,6 +115,11 @@ jobs:
         working-directory: env/staging/sqs
         run: terragrunt apply --terragrunt-non-interactive -auto-approve
 
+      - name: Terragrunt apply sns
+        if: ${{ steps.filter.outputs.sns == 'true' || steps.filter.outputs.common == 'true' }}
+        working-directory: env/staging/sns
+        run: terragrunt apply --terragrunt-non-interactive -auto-approve
+
       # Depends on kms
       - name: Terragrunt apply network
         if: ${{ steps.filter.outputs.network == 'true' || steps.filter.outputs.common == 'true' }}

.github/workflows/terragrunt-plan-production.yml

@@ -113,6 +113,9 @@ jobs:
             redis:
               - 'aws/redis/**'
               - 'env/production/redis/**'
+            sns:
+              - 'aws/sns/**'
+              - 'env/production/sns/**'
             sqs:
               - 'aws/sqs/**'
               - 'env/production/sqs/**'
@@ -158,6 +161,16 @@ jobs:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
           terragrunt: "true"
 
+      - name: Terragrunt plan sns
+        if: ${{ steps.filter.outputs.sns == 'true' || steps.filter.outputs.common == 'true' }}
+        uses: cds-snc/terraform-plan@v2
+        with:
+          directory: "env/production/sns"
+          comment-delete: "true"
+          comment-title: "Production: sns"
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+          terragrunt: "true"
+
       # Depends on kms
       - name: Terragrunt plan network
         if: ${{ steps.filter.outputs.network == 'true' || steps.filter.outputs.common == 'true' }}

.github/workflows/terragrunt-plan-staging.yml

@@ -96,6 +96,9 @@ jobs:
             redis:
               - 'aws/redis/**'
               - 'env/staging/redis/**'
+            sns:
+              - 'aws/sns/**'
+              - 'env/staging/sns/**'
             sqs:
               - 'aws/sqs/**'
               - 'env/staging/sqs/**'
@@ -141,6 +144,16 @@ jobs:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
           terragrunt: "true"
 
+      - name: Terragrunt plan sns
+        if: ${{ steps.filter.outputs.sns == 'true' || steps.filter.outputs.common == 'true' }}
+        uses: cds-snc/terraform-plan@v2
+        with:
+          directory: "env/staging/sns"
+          comment-delete: "true"
+          comment-title: "Staging: sns"
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+          terragrunt: "true"
+
       # Depends on kms
       - name: Terragrunt plan network
         if: ${{ steps.filter.outputs.network == 'true' || steps.filter.outputs.common == 'true' }}

aws/alarms/cloudwatch.tf

@@ -12,8 +12,8 @@ resource "aws_cloudwatch_metric_alarm" "forms_cpu_utilization_high_warn" {
   threshold           = var.threshold_ecs_cpu_utilization_high
   alarm_description   = "End User Forms Warning - High CPU usage has been detected."
 
-  alarm_actions = [aws_sns_topic.alert_warning.arn]
-  ok_actions    = [aws_sns_topic.alert_ok.arn]
+  alarm_actions = [var.sns_topic_alert_warning_arn]
+  ok_actions    = [var.sns_topic_alert_ok_arn]
   dimensions = {
     ClusterName = var.ecs_cluster_name
     ServiceName = var.ecs_service_name
@@ -36,8 +36,8 @@ resource "aws_cloudwatch_metric_alarm" "forms_memory_utilization_high_warn" {
   threshold           = var.threshold_ecs_memory_utilization_high
   alarm_description   = "End User Forms Warning - High memory usage has been detected."
 
-  alarm_actions = [aws_sns_topic.alert_warning.arn]
-  ok_actions    = [aws_sns_topic.alert_ok.arn]
+  alarm_actions = [var.sns_topic_alert_warning_arn]
+  ok_actions    = [var.sns_topic_alert_ok_arn]
 
   dimensions = {
     ClusterName = var.ecs_cluster_name
@@ -78,7 +78,7 @@ resource "aws_cloudwatch_metric_alarm" "five_hundred_response_warn" {
   treat_missing_data  = "notBreaching"
   alarm_description   = "End User Forms Warning - A 5xx HTML error was detected coming from the Forms."
 
-  alarm_actions = [aws_sns_topic.alert_warning.arn]
+  alarm_actions = [var.sns_topic_alert_warning_arn]
 
   tags = {
     (var.billing_tag_key) = var.billing_tag_value
@@ -111,7 +111,7 @@ resource "aws_cloudwatch_metric_alarm" "application_error_warn" {
   treat_missing_data  = "notBreaching"
   alarm_description   = "End User Forms Warning - An error message was detected in the ECS logs"
 
-  alarm_actions = [aws_sns_topic.alert_warning.arn]
+  alarm_actions = [var.sns_topic_alert_warning_arn]
 
   tags = {
     (var.billing_tag_key) = var.billing_tag_value
@@ -135,7 +135,7 @@ resource "aws_cloudwatch_metric_alarm" "forms_dead_letter_queue_warn" {
   treat_missing_data  = "notBreaching"
   alarm_description   = "End User Forms Warning - A message has been sent to the Dead Letter Queue."
 
-  alarm_actions = [aws_sns_topic.alert_warning.arn]
+  alarm_actions = [var.sns_topic_alert_warning_arn]
   dimensions = {
     QueueName = var.sqs_deadletter_queue_arn
   }
@@ -157,8 +157,8 @@ resource "aws_cloudwatch_metric_alarm" "response_time_warn" {
   threshold           = var.threshold_lb_response_time
   alarm_description   = "End User Forms Warning - The latency of response times from the forms are abnormally high."
   treat_missing_data  = "notBreaching"
-  alarm_actions       = [aws_sns_topic.alert_warning.arn]
-  ok_actions          = [aws_sns_topic.alert_ok.arn]
+  alarm_actions       = [var.sns_topic_alert_warning_arn]
+  ok_actions          = [var.sns_topic_alert_ok_arn]
 
 
   metric_query {
@@ -195,7 +195,7 @@ resource "aws_cloudwatch_metric_alarm" "ddos_detected_forms_warn" {
   threshold           = "0"
   alarm_description   = "End User Forms Warning - AWS has detected a DDOS attack on the End User Forms's Load Balancer"
 
-  alarm_actions = [aws_sns_topic.alert_warning.arn]
+  alarm_actions = [var.sns_topic_alert_warning_arn]
 
   dimensions = {
     ResourceArn = var.lb_arn
@@ -219,7 +219,7 @@ resource "aws_cloudwatch_metric_alarm" "ddos_detected_route53_warn" {
   threshold           = "0"
   alarm_description   = "End User Forms Warning - AWS has detected a DDOS attack on the End User Forms's DNS Server"
 
-  alarm_actions = [aws_sns_topic.alert_warning.arn]
+  alarm_actions = [var.sns_topic_alert_warning_arn]
 
   dimensions = {
     ResourceArn = "arn:aws:route53:::hostedzone/${var.hosted_zone_id}"
@@ -237,7 +237,7 @@ resource "aws_cloudwatch_metric_alarm" "ddos_detected_route53_warn" {
 resource "aws_cloudwatch_event_target" "codedeploy_sns" {
   target_id = "CodeDeploy_SNS"
   rule      = aws_cloudwatch_event_rule.codedeploy_sns.name
-  arn       = aws_sns_topic.alert_warning.arn
+  arn       = var.sns_topic_alert_warning_arn
 
   input_transformer {
     input_paths = {
@@ -284,8 +284,8 @@ resource "aws_cloudwatch_metric_alarm" "alb_ddos" {
   treat_missing_data  = "notBreaching"
 
   alarm_description = "DDoS detection for ALB"
-  alarm_actions     = [aws_sns_topic.alert_warning.arn]
-  ok_actions        = [aws_sns_topic.alert_ok.arn]
+  alarm_actions     = [var.sns_topic_alert_warning_arn]
+  ok_actions        = [var.sns_topic_alert_ok_arn]
 
   dimensions = {
     ResourceArn = var.lb_arn
@@ -306,8 +306,8 @@ resource "aws_cloudwatch_metric_alarm" "route53_ddos" {
   treat_missing_data  = "notBreaching"
 
   alarm_description = "DDoS detection for Route53"
-  alarm_actions     = [aws_sns_topic.alert_warning_us_east.arn]
-  ok_actions        = [aws_sns_topic.alert_ok_us_east.arn]
+  alarm_actions     = [var.sns_topic_alert_warning_us_east_arn]
+  ok_actions        = [var.sns_topic_alert_ok_us_east_arn]
 
   dimensions = {
     ResourceArn = "arn:aws:route53:::hostedzone/${var.hosted_zone_id}"

aws/alarms/inputs.tf

@@ -18,16 +18,6 @@ variable "hosted_zone_id" {
   type        = string
 }
 
-variable "kms_key_cloudwatch_arn" {
-  description = "CloudWatch KMS key ARN, used by SNS topics"
-  type        = string
-}
-
-variable "kms_key_cloudwatch_us_east_arn" {
-  description = "CloudWatch KMS key ARN in us-east-1, used by SNS topics"
-  type        = string
-}
-
 variable "lb_arn" {
   description = "Load balancer ARN, used by DDoS alarms"
   type        = string
@@ -63,3 +53,28 @@ variable "threshold_lb_response_time" {
   description = "Load balancer response time, in seconds, above which an alarm is triggered (10 minute period)"
   type        = string
 }
+
+variable "sns_topic_alert_critical_arn" {
+  description = "SNS topic ARN that critical alerts are sent to"
+  type        = string
+}
+
+variable "sns_topic_alert_warning_arn" {
+  description = "SNS topic ARN that warning alerts are sent to"
+  type        = string
+}
+
+variable "sns_topic_alert_ok_arn" {
+  description = "SNS topic ARN that ok alerts are sent to"
+  type        = string
+}
+
+variable "sns_topic_alert_warning_us_east_arn" {
+  description = "SNS topic ARN that warning alerts are sent to (US East)"
+  type        = string
+}
+
+variable "sns_topic_alert_ok_us_east_arn" {
+  description = "SNS topic ARN that ok alerts are sent to (US East)"
+  type        = string
+}

aws/alarms/lambda.tf

@@ -38,36 +38,44 @@ resource "aws_lambda_function" "notify_slack_sns" {
 #
 # Allow SNS to invoke Lambda function
 #
+resource "aws_lambda_permission" "notify_slack_critical" {
+  statement_id  = "AllowExecutionFromSNSCriticalAlert"
+  action        = "lambda:InvokeFunction"
+  function_name = aws_lambda_function.notify_slack_sns.function_name
+  principal     = "sns.amazonaws.com"
+  source_arn    = var.sns_topic_alert_critical_arn
+}
+
 resource "aws_lambda_permission" "notify_slack_warning" {
   statement_id  = "AllowExecutionFromSNSWarningAlert"
   action        = "lambda:InvokeFunction"
   function_name = aws_lambda_function.notify_slack_sns.function_name
   principal     = "sns.amazonaws.com"
-  source_arn    = aws_sns_topic.alert_warning.arn
+  source_arn    = var.sns_topic_alert_warning_arn
 }
 
 resource "aws_lambda_permission" "notify_slack_ok" {
   statement_id  = "AllowExecutionFromSNSOkAlert"
   action        = "lambda:InvokeFunction"
   function_name = aws_lambda_function.notify_slack_sns.function_name
   principal     = "sns.amazonaws.com"
-  source_arn    = aws_sns_topic.alert_ok.arn
+  source_arn    = var.sns_topic_alert_ok_arn
 }
 
 resource "aws_lambda_permission" "notify_slack_warning_us_east" {
   statement_id  = "AllowExecutionFromSNSWarningAlertUSEast"
   action        = "lambda:InvokeFunction"
   function_name = aws_lambda_function.notify_slack_sns.function_name
   principal     = "sns.amazonaws.com"
-  source_arn    = aws_sns_topic.alert_warning_us_east.arn
+  source_arn    = var.sns_topic_alert_warning_us_east_arn
 }
 
 resource "aws_lambda_permission" "notify_slack_ok_us_east" {
   statement_id  = "AllowExecutionFromSNSOkAlertUSEast"
   action        = "lambda:InvokeFunction"
   function_name = aws_lambda_function.notify_slack_sns.function_name
   principal     = "sns.amazonaws.com"
-  source_arn    = aws_sns_topic.alert_ok_us_east.arn
+  source_arn    = var.sns_topic_alert_ok_us_east_arn
 }
 
 #