xdr-terraform-modules/submodules/load_balancer/public_alb/security_groups.tf

#----------------------------------------------------------------------------
# Load Balancer ALB Security Group
#----------------------------------------------------------------------------
resource "aws_security_group" "alb" {
  vpc_id      = var.vpc_id
  name_prefix = "${local.name}-alb"
  description = "ALB SG for ${var.hostname}"
  tags        = merge(local.tags, { "Name" : local.name })
}

#----------------------------------------------------------------------------
# INGRESS
#----------------------------------------------------------------------------
resource "aws_security_group_rule" "http_from_internet" {
  type              = "ingress"
  description       = "HTTP - Inbound from Internet"
  from_port         = "80"
  to_port           = "80"
  protocol          = "tcp"
  cidr_blocks       = var.inbound_cidrs # tfsec:ignore:aws-vpc-no-public-ingress-sgr
  security_group_id = aws_security_group.alb.id
}

resource "aws_security_group_rule" "https_from_internet" {
  type              = "ingress"
  description       = "HTTPS - Inbound from Internet"
  from_port         = "443"
  to_port           = "443"
  protocol          = "tcp"
  cidr_blocks       = var.inbound_cidrs # tfsec:ignore:aws-vpc-no-public-ingress-sgr
  security_group_id = aws_security_group.alb.id
}

#----------------------------------------------------------------------------
# EGRESS
#----------------------------------------------------------------------------
resource "aws_security_group_rule" "alb_to_server" {
  type                     = "egress"
  description              = "${var.hostname} to the Server"
  from_port                = var.server_port
  to_port                  = var.server_port
  protocol                 = "tcp"
  source_security_group_id = var.server_security_group
  security_group_id        = aws_security_group.alb.id
}

#----------------------------------------------------------------------------
# Server Security Group
#----------------------------------------------------------------------------
resource "aws_security_group_rule" "server_from_alb" {
  type                     = "ingress"
  description              = "ALB to ${var.hostname}"
  from_port                = var.server_port
  to_port                  = var.server_port
  protocol                 = "tcp"
  source_security_group_id = aws_security_group.alb.id
  security_group_id        = var.server_security_group
}