AWS_SG_Module.tf/variables.tf at main · jhermesn/AWS_SG_Module.tf · GitHub

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# Input Variables
variable "name" {
  description = "The name of the security group. This name must be unique within the VPC."
  type        = string
}

variable "description" {
  description = "A description for the security group. Defaults to 'Security group for <name>' if empty."
  type        = string
  default     = ""
}

variable "vpc_id" {
  description = "The ID of the VPC in which to create the security group."
  type        = string

  validation {
    condition     = can(regex("^vpc-[0-9a-f]+$", var.vpc_id))
    error_message = "The vpc_id must be a valid VPC ID (e.g., vpc-xxxxxxxxxxxxxxxxx)."
  }
}

variable "tags" {
  description = "A map of tags to assign to the security group."
  type        = map(string)
  default     = {}
}

# Ingress Rules Inputs
variable "ingress_rules" {
  description = <<-EOT
  A list of ingress rules to add to the security group. Each item in the list is an object with the following attributes:
  - `description`: (Optional|string) Description of the rule.
  - `from_port`: (Required|number) Start of port range (or ICMP type number).
  - `to_port`: (Required|number) End of port range (or ICMP code number).
  - `protocol`: (Required|string) Protocol. If not icmp, tcp, udp, or all use the protocol number. Use '-1' for all protocols.
  - `cidr_blocks`: (Optional|list(string)) List of IPv4 CIDR blocks. Cannot be specified with `self` or `security_groups`.
  - `ipv6_cidr_blocks`: (Optional|list(string)) List of IPv6 CIDR blocks. Cannot be specified with `self` or `security_groups`.
  - `prefix_list_ids`: (Optional|list(string)) List of prefix list IDs. Cannot be specified with `cidr_blocks`, `ipv6_cidr_blocks`, `self` or `security_groups`.
  - `security_groups`: (Optional|list(string)) List of security group IDs. Cannot be specified with `cidr_blocks`, `ipv6_cidr_blocks` or `prefix_list_ids`.
  - `self`: (Optional|bool) If true, traffic is allowed from the security group itself. Cannot be specified with `cidr_blocks`, `ipv6_cidr_blocks`, `prefix_list_ids` or `security_groups`.
  EOT
  type = list(object({
    description      = optional(string)
    from_port        = number
    to_port          = number
    protocol         = string
    cidr_blocks      = optional(list(string))
    ipv6_cidr_blocks = optional(list(string))
    prefix_list_ids  = optional(list(string))
    security_groups  = optional(list(string))
    self             = optional(bool)
  }))
  default = []

  validation {
    condition = alltrue([
      for rule in var.ingress_rules :
      (rule.cidr_blocks == null && rule.ipv6_cidr_blocks == null && rule.prefix_list_ids == null && rule.security_groups == null && rule.self != null) || # self rule
      (rule.cidr_blocks == null && rule.ipv6_cidr_blocks == null && rule.prefix_list_ids == null && rule.security_groups != null && rule.self == null) || # security_groups rule
      (rule.cidr_blocks == null && rule.ipv6_cidr_blocks == null && rule.prefix_list_ids != null && rule.security_groups == null && rule.self == null) || # prefix_list_ids rule
      ((rule.cidr_blocks != null || rule.ipv6_cidr_blocks != null) && rule.prefix_list_ids == null && rule.security_groups == null && rule.self == null)  # cidr_blocks or ipv6_cidr_blocks rule
    ])
    error_message = "Each ingress rule must specify exactly one source type: cidr_blocks/ipv6_cidr_blocks, prefix_list_ids, security_groups, or self."
  }
}

# Variable for simple CIDR-based ingress rules
variable "ingress_with_cidr_blocks" {
  description = "List of ingress rules, simpler format for CIDR blocks only. Each object expects `from_port`, `to_port`, `protocol`, `cidr_blocks` (string), and optionally `description`."
  type = list(object({
    description = optional(string)
    from_port   = number
    to_port     = number
    protocol    = string
    cidr_blocks = string
  }))
  default = []
}

# Variable for simple source SG-based ingress rules
variable "ingress_with_source_security_group_id" {
  description = "List of ingress rules, simpler format for source security group ID only. Each object expects `from_port`, `to_port`, `protocol`, `source_security_group_id` (string), and optionally `description`."
  type = list(object({
    description              = optional(string)
    from_port                = number
    to_port                  = number
    protocol                 = string
    source_security_group_id = string
  }))
  default = []
}

# Egress Rules Inputs
variable "egress_rules" {
  description = <<-EOT
  A list of egress rules to add to the security group. Each item in the list is an object with the following attributes:
  - `description`: (Optional|string) Description of the rule.
  - `from_port`: (Required|number) Start of port range (or ICMP type number). Use 0 for all ports.
  - `to_port`: (Required|number) End of port range (or ICMP code number). Use 0 for all ports.
  - `protocol`: (Required|string) Protocol. If not icmp, tcp, udp, or all use the protocol number. Use '-1' for all protocols.
  - `cidr_blocks`: (Optional|list(string)) List of IPv4 CIDR blocks. Cannot be specified with `self` or `security_groups`.
  - `ipv6_cidr_blocks`: (Optional|list(string)) List of IPv6 CIDR blocks. Cannot be specified with `self` or `security_groups`.
  - `prefix_list_ids`: (Optional|list(string)) List of prefix list IDs. Cannot be specified with `cidr_blocks`, `ipv6_cidr_blocks`, `self` or `security_groups`.
  - `security_groups`: (Optional|list(string)) List of destination security group IDs. Cannot be specified with `cidr_blocks`, `ipv6_cidr_blocks` or `prefix_list_ids`.
  - `self`: (Optional|bool) If true, traffic is allowed to the security group itself. Cannot be specified with `cidr_blocks`, `ipv6_cidr_blocks`, `prefix_list_ids` or `security_groups`.
  EOT
  type = list(object({
    description      = optional(string)
    from_port        = number
    to_port          = number
    protocol         = string
    cidr_blocks      = optional(list(string))
    ipv6_cidr_blocks = optional(list(string))
    prefix_list_ids  = optional(list(string))
    security_groups  = optional(list(string)) # Destination SG for egress
    self             = optional(bool)
  }))
  default = []

  validation {
    condition = alltrue([
      for rule in var.egress_rules :
      (rule.cidr_blocks == null && rule.ipv6_cidr_blocks == null && rule.prefix_list_ids == null && rule.security_groups == null && rule.self != null) || # self rule
      (rule.cidr_blocks == null && rule.ipv6_cidr_blocks == null && rule.prefix_list_ids == null && rule.security_groups != null && rule.self == null) || # security_groups rule
      (rule.cidr_blocks == null && rule.ipv6_cidr_blocks == null && rule.prefix_list_ids != null && rule.security_groups == null && rule.self == null) || # prefix_list_ids rule
      ((rule.cidr_blocks != null || rule.ipv6_cidr_blocks != null) && rule.prefix_list_ids == null && rule.security_groups == null && rule.self == null)  # cidr_blocks or ipv6_cidr_blocks rule
    ])
    error_message = "Each egress rule must specify exactly one destination type: cidr_blocks/ipv6_cidr_blocks, prefix_list_ids, security_groups, or self."
  }
}

# Variable for simple CIDR-based egress rules
variable "egress_with_cidr_blocks" {
  description = "List of egress rules, simpler format for CIDR blocks only. Each object expects `from_port`, `to_port`, `protocol`, `cidr_blocks` (string), and optionally `description`."
  type = list(object({
    description = optional(string)
    from_port   = number
    to_port     = number
    protocol    = string
    cidr_blocks = string
  }))
  default = []
}

# Variable for simple destination SG-based egress rules
variable "egress_with_destination_security_group_id" {
  description = "List of egress rules, simpler format for destination security group ID only. Each object expects `from_port`, `to_port`, `protocol`, `destination_security_group_id` (string), and optionally `description`."
  type = list(object({
    description                   = optional(string)
    from_port                     = number
    to_port                       = number
    protocol                      = string
    destination_security_group_id = string
  }))
  default = []
}

variable "create_default_egress_rule" {
  description = "If true and no egress rules are specified, a default rule allowing all outbound traffic will be created."
  type        = bool
  default     = true
}