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ForAnyValue:ArnLikeIfExists

Warning:

ForAnyValue: ArnLikeIfExists is actively confusing. Any operator starting with ForAnyValue will ignore IfExists. IfExists is not evaluated against the entire array, it is only evaluated against a single value at a time, inside the ForAnyValue loop.

This is the kind of thing Jacob would do. Use ForAnyValue: ArnLike instead so your coworkers don't hate you.

ForAnyValue: ArnLikeIfExists

ForAnyValue: ArnLikeIfExists 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 comparison 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: ArnLikeIfExists in an Allow Statement

Given the Policy Condition: 
"ForAnyValue:ArnLikeIfExists": {
  "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:ArnLikeIfExists": {
  "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:ArnLikeIfExists": {
  "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:ArnLikeIfExists": {
  "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:ArnLikeIfExists": {
  "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: ArnLikeIfExists in a Deny Statement

Given the Policy Condition: 
"ForAnyValue:ArnLikeIfExists": {
  "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:ArnLikeIfExists": {
  "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:ArnLikeIfExists": {
  "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:ArnLikeIfExists": {
  "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:ArnLikeIfExists": {
  "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