Merge pull request #4568 from nhsuk/enforce_ssl_db_connection

Enforce SSL encrypted DB connections

Author: thomasleese

config/aws-eu-west-2-root-ca.crt

@@ -0,0 +1,76 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

config/database.yml

@@ -12,6 +12,10 @@ test:
 staging:
   <<: *default
   database: manage_vaccinations_staging
+  sslmode: verify-full
+  sslrootcert: config/aws-eu-west-2-root-ca.crt
 production:
   <<: *default
   database: manage_vaccinations_production
+  sslmode: verify-full
+  sslrootcert: config/aws-eu-west-2-root-ca.crt # This certificate is valid until 2061

terraform/app/rds.tf

@@ -52,7 +52,7 @@ resource "aws_rds_cluster" "core" {
   allow_major_version_upgrade           = true
   preferred_backup_window               = "01:00-01:30"
   preferred_maintenance_window          = "sun:02:30-sun:03:00"
-  db_cluster_parameter_group_name       = var.enable_enhanced_db_monitoring ? aws_rds_cluster_parameter_group.enhanced_monitoring[0].name : "default.aurora-postgresql16"
+  db_cluster_parameter_group_name       = aws_rds_cluster_parameter_group.custom_parameters.name
   database_insights_mode                = var.enable_enhanced_db_monitoring ? "advanced" : "standard"
   performance_insights_enabled          = var.enable_enhanced_db_monitoring
   performance_insights_retention_period = var.enable_enhanced_db_monitoring ? 465 : 0
@@ -93,31 +93,32 @@ resource "aws_rds_cluster_instance" "core" {
   monitoring_role_arn  = var.enable_enhanced_db_monitoring ? aws_iam_role.enhanced_db_monitoring[0].arn : null
 }
 
-resource "aws_rds_cluster_parameter_group" "enhanced_monitoring" {
-  count       = var.enable_enhanced_db_monitoring ? 1 : 0
+resource "aws_rds_cluster_parameter_group" "custom_parameters" {
   family      = "aurora-postgresql16"
-  name        = "enhanced-monitoring-group-${var.environment}"
-  description = "DB cluster parameter group for enhanced DB monitoring"
+  name        = "cluster-group-${var.environment}"
+  description = "Custom DB cluster parameter group"
 
   parameter {
-    name  = "aurora_compute_plan_id"
+    name  = "rds.force_ssl"
     value = 1 # true
   }
-  parameter {
-    name  = "aurora_stat_plans.minutes_until_recapture"
-    value = 5
-  }
-  parameter {
-    name  = "log_parameter_max_length"
-    value = 0
-  }
-  parameter {
-    name  = "log_min_duration_statement"
-    value = 1000
+
+  dynamic "parameter" {
+    for_each = var.enable_enhanced_db_monitoring ? {
+      "aurora_compute_plan_id"                    = 1, # true
+      "aurora_stat_plans.minutes_until_recapture" = 5,
+      "log_parameter_max_length"                  = 0,
+      "log_min_duration_statement"                = 1000,
+      "log_line_prefix"                           = "%m:%r:%u@%d:[%p]:%l:%e:%s:%v:%x:%c:%q%a:"
+    } : {}
+    content {
+      name  = parameter.key
+      value = parameter.value
+    }
   }
-  parameter {
-    name  = "log_line_prefix"
-    value = "%m:%r:%u@%d:[%p]:%l:%e:%s:%v:%x:%c:%q%a:"
+
+  lifecycle {
+    ignore_changes = [description]
   }
 }