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Configure IAM permission boundaries in AWS to delegate role creation to developers while enforcing maximum privilege limits set by the security team. Use when configureing iam permission boundaries in aws to delegate role creation.
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| name | implementing-aws-iam-permission-boundaries |
| description | Configure IAM permission boundaries in AWS to delegate role creation to developers while enforcing maximum privilege limits set by the security team. Use when configureing iam permission boundaries in aws to delegate role creation. |
| domain | cybersecurity |
| subdomain | identity-access-management |
| tags | ["aws","iam","permission-boundaries","least-privilege","delegation","cloud-security"] |
| version | 1.0 |
| author | oyi77 |
| license | Apache-2.0 |
| nist_csf | ["PR.AA-01","PR.AA-02","PR.AA-05","PR.AA-06"] |
IAM permission boundaries are an advanced AWS feature that sets the maximum permissions an identity-based policy can grant to an IAM entity (user or role). They enable centralized security teams to safely delegate IAM role and policy creation to application developers without risking privilege escalation. The effective permissions of an entity are the intersection of its identity-based policies and its permission boundary -- even if an identity policy grants AdministratorAccess, the permission boundary restricts it to only the allowed actions.
Trigger phrases:
"implementing aws iam permission boundaries"
"Configure IAM permission boundaries in AWS to delegate role creation to develope"
When deploying or configuring implementing aws iam permission boundaries capabilities in your environment
When establishing security controls aligned to compliance requirements
When building or improving security architecture for this domain
When conducting security assessments that require this implementation
This section covers core concepts for implementing aws iam permission boundaries.
Identity-Based Policy Permission Boundary
(What the role CAN do) ∩ (What the role MAY do)
│ │
└──────────┬───────────────────┘
│
Effective Permissions
(Only actions in BOTH policies)
AWS evaluates permissions in this order:
The entity can only perform an action if ALL applicable policy types allow it.
| Use Case | Description |
|---|---|
| Developer Delegation | Allow devs to create IAM roles without escalating beyond their boundary |
| Sandbox Isolation | Limit what roles can do in sandbox/dev accounts |
| Multi-Tenant Workloads | Ensure tenant-specific roles cannot access other tenants' resources |
| CI/CD Pipeline Roles | Restrict automation roles to specific services |
Create a managed policy that defines the maximum allowed permissions:
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "AllowedServices",
"Effect": "Allow",
"Action": [
"s3:*",
"dynamodb:*",
"lambda:*",
"logs:*",
"cloudwatch:*",
"sqs:*",
"sns:*",
"events:*",
"states:*",
"xray:*",
"ec2:Describe*",
"ec2:CreateTags",
"sts:AssumeRole",
"kms:Decrypt",
"kms:GenerateDataKey",
"kms:DescribeKey",
"secretsmanager:GetSecretValue"
],
"Resource": "*"
},
{
"Sid": "AllowIAMPassRole",
"Effect": "Allow",
"Action": "iam:PassRole",
"Resource": "arn:aws:iam::*:role/app-*",
"Condition": {
"StringEquals": {
"iam:PassedToService": [
"lambda.amazonaws.com",
"states.amazonaws.com"
]
}
}
},
{
"Sid": "DenyBoundaryDeletion",
"Effect": "Deny",
"Action": [
"iam:DeletePolicy",
"iam:DeletePolicyVersion",
"iam:CreatePolicyVersion"
],
"Resource": "arn:aws:iam::*:policy/DeveloperBoundary"
},
{
"Sid": "DenyBoundaryRemoval",
"Effect": "Deny",
"Action": [
"iam:DeleteUserPermissionsBoundary",
"iam:DeleteRolePermissionsBoundary"
],
"Resource": "*"
}
]
}
Grant developers the ability to create IAM roles, but only with the boundary attached:
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "AllowCreateRoleWithBoundary",
"Effect": "Allow",
"Action": [
"iam:CreateRole",
"iam:AttachRolePolicy",
"iam:DetachRolePolicy",
"iam:PutRolePolicy",
"iam:DeleteRolePolicy"
],
"Resource": "arn:aws:iam::*:role/app-*",
"Condition": {
"StringEquals": {
"iam:PermissionsBoundary": "arn:aws:iam::*:policy/DeveloperBoundary"
}
}
},
{
"Sid": "AllowCreatePolicyScoped",
"Effect": "Allow",
"Action": [
"iam:CreatePolicy",
"iam:DeletePolicy",
"iam:CreatePolicyVersion",
"iam:DeletePolicyVersion"
],
"Resource": "arn:aws:iam::*:policy/app-*"
},
{
"Sid": "AllowViewIAM",
"Effect": "Allow",
"Action": [
"iam:Get*",
"iam:List*"
],
"Resource": "*"
}
]
}
# Create the boundary policy
aws iam create-policy \
--policy-name DeveloperBoundary \
--policy-document file://developer-boundary.json
# Attach boundary to an existing role
aws iam put-role-permissions-boundary \
--role-name developer-role \
--permissions-boundary arn:aws:iam::123456789012:policy/DeveloperBoundary
# Create a new role with boundary
aws iam create-role \
--role-name app-lambda-executor \
--assume-role-policy-document file://trust-policy.json \
--permissions-boundary arn:aws:iam::123456789012:policy/DeveloperBoundary
The boundary must include deny statements to prevent developers from:
resource "aws_iam_policy" "developer_boundary" {
name = "DeveloperBoundary"
path = "/"
policy = file("${path.module}/policies/developer-boundary.json")
}
resource "aws_iam_role" "app_role" {
name = "app-lambda-executor"
assume_role_policy = data.aws_iam_policy_document.lambda_trust.json
permissions_boundary = aws_iam_policy.developer_boundary.arn
}
app-* prefix)| Rationalization | Reality |
|---|---|
| "We are too small to be targeted" | Automated attacks target everyone. Size does not matter. |
| "Security slows us down" | A breach slows you down 100x more. Build security in from the start. |
| "We will fix it after launch" | Vulnerabilities in production are exploited within hours. Fix before deploy. |