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ForAnyValue:ArnEqualsIfExists

Warning:

In spite of the name difference ForAnyValue: ArnEqualsIfExists behaves exactly the same as ForAnyValue: ArnLike. Switch to ForAnyValue: ArnLike so people don't ask later what in the world you were thinking.

ForAnyValue: ArnEqualsIfExists

ForAnyValue: ArnEqualsIfExists compares a list of ARNs in a request to a list of ARN patterns in your policy. The policy values can include asterisks (*) to match multiple characters and question marks (?) to match a single character within an ARN segement. Wildcards cannot be used to span ARN segment, so the partition, service, region, account, and resource must all be present in your policy value, even if they are all wildcards. The comparision is case sensitive.

To match a request, the context key must exist in the request and at least one ARN in the request must match one of the ARN patterns in your policy.

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

ForAnyValue: ArnEqualsIfExists in an Allow Statement

Given the Policy Condition: 
"ForAnyValue:ArnEqualsIfExists": {
  "logs:LogGeneratingResourceArns": [
    "arn:aws:iam::123456789012:role/*",
    "arn:aws:ec2:*:123456789012:instance/i-?????"
  ]
}
When the Request Context has:
logs:LogGeneratingResourceArns: null
Then the result is:
Not Allowed Not Allowed Statement does not apply
Given the Policy Condition: 
"ForAnyValue:ArnEqualsIfExists": {
  "logs:LogGeneratingResourceArns": [
    "arn:aws:iam::123456789012:role/*",
    "arn:aws:ec2:*:123456789012:instance/i-?????"
  ]
}
When the Request Context has:
logs:LogGeneratingResourceArns:
 - arn:aws:iam::123456789012:user/User
 - arn:aws:iam::123456789012:user/OtherUser
Then the result is:
Not Allowed Not Allowed Statement does not apply
Given the Policy Condition: 
"ForAnyValue:ArnEqualsIfExists": {
  "logs:LogGeneratingResourceArns": [
    "arn:aws:iam::123456789012:role/*",
    "arn:aws:ec2:*:123456789012:instance/i-?????"
  ]
}
When the Request Context has:
logs:LogGeneratingResourceArns:
 - arn:aws:iam::123456789012:role/AdminRole
 - arn:aws:iam::123456789012:user/User
Then the result is:
Allowed Allowed Assuming no explicit Deny elsewhere
Given the Policy Condition: 
"ForAnyValue:ArnEqualsIfExists": {
  "logs:LogGeneratingResourceArns": [
    "arn:aws:iam::123456789012:role/*",
    "arn:aws:ec2:*:123456789012:instance/i-?????"
  ]
}
When the Request Context has:
logs:LogGeneratingResourceArns:
 - arn:aws:iam::123456789012:role/AdminRole
 - arn:aws:ec2:us-east-1:123456789012:instance/i-0b22a
Then the result is:
Allowed Allowed Assuming no explicit Deny elsewhere
Given the Policy Condition: 
"ForAnyValue:ArnEqualsIfExists": {
  "logs:LogGeneratingResourceArns": [
    "arn:aws:iam::123456789012:role/*",
    "arn:aws:ec2:*:123456789012:instance/i-?????"
  ]
}
When the Request Context has:
logs:LogGeneratingResourceArns:
 - arn:aws:iam::123456789012:role/AdminRole
 - arn:aws:ec2:us-east-1:123456789012:instance/i-0b22a
 - arn:aws:iam::123456789012:user/User
Then the result is:
Allowed Allowed Assuming no explicit Deny elsewhere

ForAnyValue: ArnEqualsIfExists in a Deny Statement

Given the Policy Condition: 
"ForAnyValue:ArnEqualsIfExists": {
  "logs:LogGeneratingResourceArns": [
    "arn:aws:iam::123456789012:role/*",
    "arn:aws:ec2:*:123456789012:instance/i-?????"
  ]
}
When the Request Context has:
logs:LogGeneratingResourceArns: null
Then the result is:
Not Denied Not Denied May be allowed by another statement
Given the Policy Condition: 
"ForAnyValue:ArnEqualsIfExists": {
  "logs:LogGeneratingResourceArns": [
    "arn:aws:iam::123456789012:role/*",
    "arn:aws:ec2:*:123456789012:instance/i-?????"
  ]
}
When the Request Context has:
logs:LogGeneratingResourceArns:
 - arn:aws:iam::123456789012:user/User
 - arn:aws:iam::123456789012:user/OtherUser
Then the result is:
Not Denied Not Denied May be allowed by another statement
Given the Policy Condition: 
"ForAnyValue:ArnEqualsIfExists": {
  "logs:LogGeneratingResourceArns": [
    "arn:aws:iam::123456789012:role/*",
    "arn:aws:ec2:*:123456789012:instance/i-?????"
  ]
}
When the Request Context has:
logs:LogGeneratingResourceArns:
 - arn:aws:iam::123456789012:role/AdminRole
 - arn:aws:iam::123456789012:user/User
Then the result is:
Denied Denied
Given the Policy Condition: 
"ForAnyValue:ArnEqualsIfExists": {
  "logs:LogGeneratingResourceArns": [
    "arn:aws:iam::123456789012:role/*",
    "arn:aws:ec2:*:123456789012:instance/i-?????"
  ]
}
When the Request Context has:
logs:LogGeneratingResourceArns:
 - arn:aws:iam::123456789012:role/AdminRole
 - arn:aws:ec2:us-east-1:123456789012:instance/i-0b22a
Then the result is:
Denied Denied
Given the Policy Condition: 
"ForAnyValue:ArnEqualsIfExists": {
  "logs:LogGeneratingResourceArns": [
    "arn:aws:iam::123456789012:role/*",
    "arn:aws:ec2:*:123456789012:instance/i-?????"
  ]
}
When the Request Context has:
logs:LogGeneratingResourceArns:
 - arn:aws:iam::123456789012:role/AdminRole
 - arn:aws:ec2:us-east-1:123456789012:instance/i-0b22a
 - arn:aws:iam::123456789012:user/User
Then the result is:
Denied Denied