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iam.tf
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#########
## IAM ##
#########
data "aws_iam_policy_document" "ecs_tasks" {
statement {
actions = [
"sts:AssumeRole",
]
effect = "Allow"
principals {
type = "Service"
identifiers = ["ecs-tasks.amazonaws.com"]
}
}
}
resource "aws_iam_role" "ecs_task_execution" {
count = var.create_default_role ? 1 : 0
name = "${var.environment}-${var.name}-ecs-task-execution"
assume_role_policy = data.aws_iam_policy_document.ecs_tasks.json
tags = local.local_tags
}
resource "aws_iam_role_policy_attachment" "ecs_task_execution" {
count = var.create_default_role ? length(var.policies_arn) : 0
role = aws_iam_role.ecs_task_execution[0].id
policy_arn = element(var.policies_arn, count.index)
}
####################
## Secrets Access ##
####################
data "aws_secretsmanager_secret" "creds" {
count = var.repository_credentials_name != null ? 1 : 0
name = var.repository_credentials_name
}
locals {
secretsmanager_arns = [
"arn:aws:secretsmanager:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:secret:/${local.secret_path}/*",
"arn:aws:secretsmanager:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:secret:/${var.environment}/shared/*"
]
}
data "aws_iam_policy_document" "ecs_task_access_secrets" {
statement {
effect = "Allow"
resources = [
"arn:aws:ssm:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:parameter/${local.secret_path}/*",
"arn:aws:ssm:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:parameter/${var.environment}/shared/*",
]
actions = [
"ssm:GetParameter",
"ssm:GetParameters",
"ssm:GetParametersByPath",
]
}
statement {
effect = "Allow"
resources = concat(
local.secretsmanager_arns,
var.repository_credentials_name != null ? [data.aws_secretsmanager_secret.creds[0].arn] : []
)
actions = [
"secretsmanager:GetSecretValue",
]
}
}
resource "aws_iam_role_policy" "ecs_task_access_secrets" {
count = var.create_default_role ? 1 : 0
name = "ECSTaskAccessSecretsPolicy"
role = aws_iam_role.ecs_task_execution[0].id
policy = element(
compact(
concat(
data.aws_iam_policy_document.ecs_task_access_secrets.*.json,
),
),
0,
)
}
#######################
## S3 Backend Access ##
#######################
data "aws_iam_policy_document" "ecs_task_access_backend" {
statement {
effect = "Allow"
resources = [
"arn:aws:s3:::*"
]
actions = [
"s3:*",
]
}
}
resource "aws_iam_role_policy" "ecs_task_access_backend" {
count = var.create_default_role ? 1 : 0
name = "ECSTaskAccessBackendPolicy"
role = aws_iam_role.ecs_task_execution[0].id
policy = element(
compact(
concat(
data.aws_iam_policy_document.ecs_task_access_backend.*.json,
),
),
0,
)
}