rspec/rules/S6321/terraform/rule.adoc

include::../description.adoc[]

include::../recommended.adoc[]

== Noncompliant Code Example

An ingress rule allowing all inbound SSH traffic for AWS:

[source,terraform]
----
resource "aws_security_group" "noncompliant" {
  name        = "allow_ssh_noncompliant"
  description = "allow_ssh_noncompliant"
  vpc_id      = aws_vpc.main.id

  ingress {
    description      = "SSH rule"
    from_port        = 22
    to_port          = 22
    protocol         = "tcp"
    cidr_blocks      = ["0.0.0.0/0"]  # Noncompliant
  }
}
----

A security rule allowing all inbound SSH traffic for Azure:

[source,terraform]
----
resource "azurerm_network_security_rule" "noncompliant" {
  priority                    = 100
  direction                   = "Inbound"
  access                      = "Allow"
  protocol                    = "Tcp"
  source_port_range           = "*"
  destination_port_range      = "22"
  source_address_prefix       = "*"  # Noncompliant
  destination_address_prefix  = "*"
}
----

A firewall rule allowing all inbound SSH traffic for GCP:

[source,terraform]
----
resource "google_compute_firewall" "noncompliant" {
  network = google_compute_network.default.name

  allow {
    protocol = "tcp"
    ports    = ["22"]
  }

  source_ranges = ["0.0.0.0/0"]  # Noncompliant
}
----

A security rule allowing all inbound SSH traffic for Azure:

[source,terraform]
----
resource "azurerm_network_security_rule" "noncompliant" {
  priority                    = 100
  direction                   = "Inbound"
  access                      = "Allow"
  protocol                    = "Tcp"
  source_port_range           = "*"
  destination_port_range      = "22"
  source_address_prefix       = "*"  # Noncompliant
  destination_address_prefix  = "*"
}
----

== Compliant Solution

An ingress rule allowing inbound SSH traffic from specific IP addresses for AWS:

[source,terraform]
----
resource "aws_security_group" "compliant" {
  name        = "allow_ssh_compliant"
  description = "allow_ssh_compliant"
  vpc_id      = aws_vpc.main.id

  ingress {
    description      = "SSH rule"
    from_port        = 22
    to_port          = 22
    protocol         = "tcp"
    cidr_blocks      = ["1.2.3.0/24"]
  }
}
----

A security rule allowing inbound SSH traffic from specific IP addresses for Azure:


[source,terraform]
----
resource "azurerm_network_security_rule" "compliant" {
  priority                    = 100
  direction                   = "Inbound"
  access                      = "Allow"
  protocol                    = "Tcp"
  source_port_range           = "*"
  destination_port_range      = "22"
  source_address_prefix       = "1.2.3.0"
  destination_address_prefix  = "*"
}
----

A firewall rule allowing inbound SSH traffic from specific IP addresses for GCP:

[source,terraform]
----
resource "google_compute_firewall" "compliant" {
  network = google_compute_network.default.name

  allow {
    protocol = "tcp"
    ports    = ["22"]
  }

  source_ranges = ["10.0.0.1/32"]
}
----
include::../see.adoc[]