ForAllValues:ArnLikeIfExists

Warning:

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

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

ForAllValues: ArnLikeIfExists

ForAllValues: 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 comparision is case sensitive.

To match a request, the context key can be absent, but if it is present, all of the ARNs in the request must match at least one of the ARN patterns in your policy.

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

ForAllValues: ArnLikeIfExists in an Allow Statement

Click into any of these polices and change them test how they change the result.

Given the Policy Condition:

"ForAllValues: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:

Allowed Assuming no explicit Deny elsewhere

Given the Policy Condition:

"ForAllValues: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 Statement does not apply

Given the Policy Condition:

"ForAllValues: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:

Not Allowed Statement does not apply

Given the Policy Condition:

"ForAllValues: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

Then the result is:

Allowed Assuming no explicit Deny elsewhere

Given the Policy Condition:

"ForAllValues: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 Assuming no explicit Deny elsewhere

Given the Policy Condition:

"ForAllValues: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:

Not Allowed Statement does not apply

ForAllValues: ArnLikeIfExists in a Deny Statement

Click into any of these polices and change them test how they change the result.

Given the Policy Condition:

"ForAllValues: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:

Denied

Given the Policy Condition:

"ForAllValues: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 May be allowed by another statement

Given the Policy Condition:

"ForAllValues: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:

Not Denied May be allowed by another statement

Given the Policy Condition:

"ForAllValues: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

Then the result is:

Denied

Given the Policy Condition:

"ForAllValues: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

Given the Policy Condition:

"ForAllValues: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:

Not Denied May be allowed by another statement