Provides a security group rule resource. Represents a single ingress or egress group rule, which can be added to external Security Groups.

~> NOTE on Security Groups and Security Group Rules: Terraform currently provides both a standalone Security Group Rule resource (a single ingress or egress rule), and a Security Group resource with ingress and egress rules defined in-line. At this time you cannot use a Security Group with in-line rules in conjunction with any Security Group Rule resources. Doing so will cause a conflict of rule settings and will overwrite rules.

Example Usage

Basic usage

resource "aws_security_group_rule" "allow_all" {
    type = "ingress"
    from_port = 0
    to_port = 65535
    protocol = "tcp"
    cidr_blocks = [""]
    prefix_list_ids = ["pl-12c4e678"]

    security_group_id = "sg-123456"

Argument Reference

The following arguments are supported:

  • type - (Required) The type of rule being created. Valid options are ingress (inbound) or egress (outbound).
  • cidr_blocks - (Optional) List of CIDR blocks. Cannot be specified with source_security_group_id.
  • prefix_list_ids - (Optional) List of prefix list IDs (for allowing access to VPC endpoints). Only valid with egress.
  • from_port - (Required) The start port (or ICMP type number if protocol is "icmp").
  • protocol - (Required) The protocol.
  • security_group_id - (Required) The security group to apply this rule to.
  • source_security_group_id - (Optional) The security group id to allow access to/from, depending on the type. Cannot be specified with cidr_blocks.
  • self - (Optional) If true, the security group itself will be added as a source to this ingress rule.
  • to_port - (Required) The end range port (or ICMP code if protocol is "icmp").

Usage with prefix list IDs

Prefix list IDs are manged by AWS internally. Prefix list IDs are associated with a prefix list name, or service name, that is linked to a specific region. Prefix list IDs are exported on VPC Endpoints, so you can use this format:

resource "aws_security_group_rule" "allow_all" {
    type = "egress"
    to_port = 0
    protocol = "-1"
    prefix_list_ids = ["${aws_vpc_endpoint.my_endpoint.prefix_list_id}"]
    from_port = 0
    security_group_id = "sg-123456"
resource "aws_vpc_endpoint" "my_endpoint" {

Attributes Reference

The following attributes are exported:

  • id - The ID of the security group rule
  • type - The type of rule, ingress or egress
  • from_port - The source port
  • to_port - The destination port
  • protocol – The protocol used