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BoolIfExists

BoolIfExists

compares a boolean in a request to a boolean in your policy.

To match a request, the context key can be absent, but if present it must match the boolean in your policy.

You can use policy variables in the value of this operator.

BoolIfExists in an Allow Statement

Simulate in IAM Simulate

Policy Condition	Request Context	Result
"BoolIfExists": { "aws:PrincipalIsAWSService": "true" }	`aws:PrincipalIsAWSService: null`	✓ Allowed Assuming no explicit Deny elsewhere
"BoolIfExists": { "aws:PrincipalIsAWSService": "true" }	`aws:PrincipalIsAWSService: true`	✓ Allowed Assuming no explicit Deny elsewhere
"BoolIfExists": { "aws:PrincipalIsAWSService": "true" }	`aws:PrincipalIsAWSService: false`	− Not Allowed Statement does not apply

BoolIfExists in a Deny Statement

Simulate in IAM Simulate

Policy Condition	Request Context	Result
"BoolIfExists": { "aws:PrincipalIsAWSService": "true" }	`aws:PrincipalIsAWSService: null`	✕ Denied
"BoolIfExists": { "aws:PrincipalIsAWSService": "true" }	`aws:PrincipalIsAWSService: true`	✕ Denied
"BoolIfExists": { "aws:PrincipalIsAWSService": "true" }	`aws:PrincipalIsAWSService: false`	− Not Denied May be allowed by another statement