IAM Tools
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BoolIfExists

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

Given the Policy Condition: 
"BoolIfExists": {
  "aws:PrincipalIsAWSService": "true"
}
When the Request Context has:
aws:PrincipalIsAWSService: null
Then the result is:
Allowed Allowed Assuming no explicit Deny elsewhere
Given the Policy Condition: 
"BoolIfExists": {
  "aws:PrincipalIsAWSService": "true"
}
When the Request Context has:
aws:PrincipalIsAWSService: true
Then the result is:
Allowed Allowed Assuming no explicit Deny elsewhere
Given the Policy Condition: 
"BoolIfExists": {
  "aws:PrincipalIsAWSService": "true"
}
When the Request Context has:
aws:PrincipalIsAWSService: false
Then the result is:
Not Allowed Not Allowed Statement does not apply

BoolIfExists in a Deny Statement

Given the Policy Condition: 
"BoolIfExists": {
  "aws:PrincipalIsAWSService": "true"
}
When the Request Context has:
aws:PrincipalIsAWSService: null
Then the result is:
Denied Denied
Given the Policy Condition: 
"BoolIfExists": {
  "aws:PrincipalIsAWSService": "true"
}
When the Request Context has:
aws:PrincipalIsAWSService: true
Then the result is:
Denied Denied
Given the Policy Condition: 
"BoolIfExists": {
  "aws:PrincipalIsAWSService": "true"
}
When the Request Context has:
aws:PrincipalIsAWSService: false
Then the result is:
Not Denied Not Denied May be allowed by another statement