terraform-aws-vpc/firewall-production.tf

#********************************************************************************************
# Variables

# Réseau public
variable "public_subnets_cidr" {
  type        = list(any)
  default     = ["10.0.0.0/20", "10.0.32.0/20", "10.0.64.0/20"]
  description = "Bloc CIDR pour sous-réseau Public"
}

# Réseau privée
variable "private_subnets_cidr" {
  type        = list(any)
  default     = ["10.0.16.0/20", "10.0.48.0/20", "10.0.80.0/20"]
  description = "Bloc CIDR pour sous-réseau Privée"

#********************************************************************************************
#

#
resource "aws_security_group" "allow_all" {
  name   = "allow_all"
  vpc_id = aws_vpc.default.id
  ingress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }
  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }
}

#
resource "aws_networkfirewall_rule_group" "default_group" {
  capacity = 100
  name     = "default-group"
  type     = "STATEFUL"
  rule_group {
    rules_source {
      stateful_rule {
        action = "DROP"
        header {
          protocol          = "TCP"
          source            = "ANY"
          source_port       = "ANY"
          direction         = "ANY"
          destination       = "ANY"
          destination_port  = "ANY"
        }
        rule_option {
          keyword  = "sid"
          settings = ["1"]
        }
      }
      stateful_rule {
        action = "PASS"
        header {
          protocol          = "TCP"
          source            = "10.0.1.0/24"
          source_port       = "ANY"
          direction         = "ANY"
          destination       = "ANY"
          destination_port  = "80"
        }
        rule_option {
          keyword  = "sid"
          settings = ["2"]
        }
      }
      stateful_rule {
        action = "PASS"
        header {
          protocol          = "TCP"
          source            = "ANY"
          source_port       = "ANY"
          direction         = "ANY"
          destination       = "10.0.2.0/24"
          destination_port  = "443"
        }
        rule_option {
          keyword  = "sid"
          settings = ["3"]
        }
      }
    }
  }
}

#
resource "aws_networkfirewall_firewall_policy" "default_policy" {
  name = "default-policy"

  firewall_policy {
    stateful_rule_group_reference {
      resource_arn = aws_networkfirewall_rule_group.stateful_group.arn
    }
    stateless_default_actions          = ["aws:forward_to_sfe"]
    stateless_fragment_default_actions = ["aws:forward_to_sfe"]
  }
}

#
resource "aws_networkfirewall_firewall" "default_firewall" {
  name                = "default-firewall"
  firewall_policy_arn = aws_networkfirewall_firewall_policy.default_policy.arn
  vpc_id              = aws_vpc.default.id

  subnet_mapping {
    count     = length(var.public_subnets_cidr)
    subnet_id = element(aws_subnet.public_subnet.*.id, count.index)
  }
  subnet_mapping {
    count     = length(var.private_subnets_cidr)
    subnet_id = element(aws_subnet.private_subnet.*.id, count.index)
  }
}