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Keep original boundary description to avoid ForceNew #98

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Merged
Alexanderamiri merged 2 commits into from
Mar 26, 2026
Merged

Keep original boundary description to avoid ForceNew #98

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a72a738
Keep original boundary description to avoid ForceNew replacement
Alexanderamiri Mar 26, 2026
4b79857
Shorten boundary ARNs with wildcards to free 500+ bytes
Alexanderamiri Mar 26, 2026
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44 changes: 23 additions & 21 deletions terraform/platform/iam/boundary.tf
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Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,7 @@ locals {

resource "aws_iam_policy" "developer_boundary" {
name = "${var.project}-developer-boundary"
description = "Team permission boundary: org denies + ABAC isolation + naming enforcement."
description = "Permission boundary for all non-platform roles. Self-replicating: roles with this boundary can only create roles that also carry it."

policy = jsonencode({
Version = "2012-10-17"
Expand Down Expand Up @@ -173,27 +173,27 @@ resource "aws_iam_policy" "developer_boundary" {
Effect = "Deny"
Action = ["ssm:GetParameter*", "ssm:GetParametersByPath"]
Resource = [
"arn:aws:ssm:${var.region}:${var.aws_account_id}:parameter/${var.project}/platform/*",
"arn:aws:ssm:${var.region}:${var.aws_account_id}:parameter/${var.project}/slack/*",
"arn:aws:ssm:${var.region}:${var.aws_account_id}:parameter/${var.project}/platform-overrides/*",
"arn:aws:ssm:*:*:parameter/${var.project}/platform/*",
"arn:aws:ssm:*:*:parameter/${var.project}/slack/*",
"arn:aws:ssm:*:*:parameter/${var.project}/platform-overrides/*",
]
},
{
Sid = "DenyPassRole"
Effect = "Deny"
Action = "iam:PassRole"
NotResource = [
"arn:aws:iam::${var.aws_account_id}:role/$${aws:PrincipalTag/team}-*",
"arn:aws:iam::${var.aws_account_id}:role/${var.project}-ecs-execution",
"arn:aws:iam::*:role/$${aws:PrincipalTag/team}-*",
"arn:aws:iam::*:role/${var.project}-ecs-execution",
]
},
{
Sid = "DenyXLogs"
Effect = "Deny"
Action = ["logs:GetLogEvents", "logs:FilterLogEvents", "logs:StartQuery", "logs:GetQueryResults"]
NotResource = [
"arn:aws:logs:${var.region}:${var.aws_account_id}:log-group:/ecs/$${aws:PrincipalTag/team}/*",
"arn:aws:logs:${var.region}:${var.aws_account_id}:log-group:/ecs/$${aws:PrincipalTag/team}/*:*",
"arn:aws:logs:*:*:log-group:/ecs/$${aws:PrincipalTag/team}/*",
"arn:aws:logs:*:*:log-group:/ecs/$${aws:PrincipalTag/team}/*:*",
]
},
{
Expand Down Expand Up @@ -232,20 +232,22 @@ resource "aws_iam_policy" "developer_boundary" {
"lambda:CreateFunction", "events:PutRule", "states:CreateStateMachine",
]
NotResource = [
# S3 ARNs have no region/account
"arn:aws:s3:::$${aws:PrincipalTag/team}-*",
"arn:aws:dynamodb:${var.region}:${var.aws_account_id}:table/$${aws:PrincipalTag/team}-*",
"arn:aws:sqs:${var.region}:${var.aws_account_id}:$${aws:PrincipalTag/team}-*",
"arn:aws:sns:${var.region}:${var.aws_account_id}:$${aws:PrincipalTag/team}-*",
"arn:aws:rds:${var.region}:${var.aws_account_id}:db:$${aws:PrincipalTag/team}-*",
"arn:aws:rds:${var.region}:${var.aws_account_id}:subgrp:$${aws:PrincipalTag/team}-*",
"arn:aws:ecs:${var.region}:${var.aws_account_id}:service/*/$${aws:PrincipalTag/team}-*",
"arn:aws:ecs:${var.region}:${var.aws_account_id}:task-definition/$${aws:PrincipalTag/team}-*:*",
"arn:aws:ecr:${var.region}:${var.aws_account_id}:repository/$${aws:PrincipalTag/team}-*",
"arn:aws:logs:${var.region}:${var.aws_account_id}:log-group:/ecs/$${aws:PrincipalTag/team}/*",
"arn:aws:ssm:${var.region}:${var.aws_account_id}:parameter/${var.project}/apps/$${aws:PrincipalTag/team}/*",
"arn:aws:lambda:${var.region}:${var.aws_account_id}:function:$${aws:PrincipalTag/team}-*",
"arn:aws:events:${var.region}:${var.aws_account_id}:rule/$${aws:PrincipalTag/team}-*",
"arn:aws:states:${var.region}:${var.aws_account_id}:stateMachine:$${aws:PrincipalTag/team}-*",
# Single-region account — wildcard region:account saves ~350 bytes
"arn:aws:dynamodb:*:*:table/$${aws:PrincipalTag/team}-*",
"arn:aws:sqs:*:*:$${aws:PrincipalTag/team}-*",
"arn:aws:sns:*:*:$${aws:PrincipalTag/team}-*",
"arn:aws:rds:*:*:db:$${aws:PrincipalTag/team}-*",
"arn:aws:rds:*:*:subgrp:$${aws:PrincipalTag/team}-*",
"arn:aws:ecs:*:*:service/*/$${aws:PrincipalTag/team}-*",
"arn:aws:ecs:*:*:task-definition/$${aws:PrincipalTag/team}-*:*",
"arn:aws:ecr:*:*:repository/$${aws:PrincipalTag/team}-*",
"arn:aws:logs:*:*:log-group:/ecs/$${aws:PrincipalTag/team}/*",
"arn:aws:ssm:*:*:parameter/${var.project}/apps/$${aws:PrincipalTag/team}/*",
"arn:aws:lambda:*:*:function:$${aws:PrincipalTag/team}-*",
"arn:aws:events:*:*:rule/$${aws:PrincipalTag/team}-*",
"arn:aws:states:*:*:stateMachine:$${aws:PrincipalTag/team}-*",
]
},
]
Expand Down