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fix(iam): attach per-workload lambda permissions boundary (PLAT-52) (#148)

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* fix(iam): attach per-workload lambda permissions boundary (PLAT-52)

* fix(iam): skip boundary delete on weekly-menu role (PLAT-52)
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Adam Moussa 2026-08-20 16:02:46 -04:00 • committed by GitHub
parent a247f2f45a
commit c5c29b2bef
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3 changed files with 18 additions and 8 deletions
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8
terraform/iam.tf
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@ -1,10 +1,10 @@
# Execution roles for the seven Lambda functions plus the API Gateway role that
# invokes the admin authorizer.
#
# Every role is created under the /tf-managed/ path and carries the account's
# seahaven-lambda-execution-boundary permissions boundary. The path is what
# distinguishes Terraform-owned roles from the /cfn-managed/ roles the retired
# SAM stack created.
# Every Lambda execution role is created under the /tf-managed/ path and
# carries seahaven-lambda-execution-boundary-meal-order-manager (PLAT-52).
# The path distinguishes Terraform-owned roles from the retired SAM
# /cfn-managed/ roles.
#
# The inline policies below are hand-expanded from the SAM policy templates in
# template.yaml (DynamoDBCrudPolicy, DynamoDBReadPolicy, S3CrudPolicy,

12
terraform/iam_github_weekly_menu.tf
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@ -47,8 +47,18 @@ resource "aws_iam_role" "weekly_menu" {
path = "/tf-managed/"
description = "GitHub Actions weekly-menu scrape/publish for meal-order-manager"
assume_role_policy = data.aws_iam_policy_document.weekly_menu_assume.json
permissions_boundary = local.boundary_arn
max_session_duration = 3600
# Not a Lambda execution role. Config omits permissions_boundary so a later
# apply will not PutRolePermissionsBoundary the Lambda ceiling back. Live still
# has seahaven-lambda-execution-boundary; omitting without ignore_changes would
# plan DeleteRolePermissionsBoundary, which hcptf-meal-order-manager is denied
# (DenyBoundaryTampering). Ignore the attribute so this apply does not touch
# the ceiling. An administrator deletes the live attachment, then a follow-up
# drops this lifecycle after refresh-only updates state to null.
lifecycle {
ignore_changes = [permissions_boundary]
}
}
data "aws_iam_policy_document" "weekly_menu" {

6
terraform/locals.tf
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@ -2,9 +2,9 @@ locals {
project = "meal-order-manager"
account_id = "011934824531"
# Every execution role in this configuration is created under /tf-managed/ and
# carries the account's Lambda execution boundary.
boundary_arn = "arn:aws:iam::${local.account_id}:policy/seahaven-lambda-execution-boundary"
# Lambda execution roles under /tf-managed/ carry the per-workload ceiling
# (PLAT-52). githubdeploy-meal-order-manager-weekly-menu must not.
boundary_arn = "arn:aws:iam::${local.account_id}:policy/seahaven-lambda-execution-boundary-meal-order-manager"
form_bucket_name = "${local.project}-form-${local.account_id}"
reports_bucket_name = "${local.project}-reports-${local.account_id}"