ForAnyValue:StringLikeIfExists

Warning:

ForAnyValue: StringLikeIfExists 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: StringLike instead so your coworkers don't hate you.

ForAnyValue: StringLikeIfExists

ForAnyValue: StringLikeIfExists compares a list of strings in a request to a list of strings in your policy. The policy values can include asterisks (*) to match multiple characters and question marks (?) to match a single character. The comparision is case sensitive.

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

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

ForAnyValue: StringLikeIfExists in an Allow Statement

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

Given the Policy Condition:

"ForAnyValue:StringLikeIfExists": {
  "aws:TagKeys": [
    "Owner:*",
    "State:??"
  ]
}

When the Request Context has:

aws:TagKeys: null

Then the result is:

Not Allowed Statement does not apply

Given the Policy Condition:

"ForAnyValue:StringLikeIfExists": {
  "aws:TagKeys": [
    "Owner:*",
    "State:??"
  ]
}

When the Request Context has:

aws:TagKeys: 
 - owner:Mktg
 - State:NewYork

Then the result is:

Not Allowed Statement does not apply

Given the Policy Condition:

"ForAnyValue:StringLikeIfExists": {
  "aws:TagKeys": [
    "Owner:*",
    "State:??"
  ]
}

When the Request Context has:

aws:TagKeys: 
 - Owner:Legal
 - owner:Mktg

Then the result is:

Allowed Assuming no explicit Deny elsewhere

Given the Policy Condition:

"ForAnyValue:StringLikeIfExists": {
  "aws:TagKeys": [
    "Owner:*",
    "State:??"
  ]
}

When the Request Context has:

aws:TagKeys: 
 - Owner:Legal
 - State:NY

Then the result is:

Allowed Assuming no explicit Deny elsewhere

Given the Policy Condition:

"ForAnyValue:StringLikeIfExists": {
  "aws:TagKeys": [
    "Owner:*",
    "State:??"
  ]
}

When the Request Context has:

aws:TagKeys: 
 - Owner:Legal
 - State:NY
 - owner:Mktg

Then the result is:

Allowed Assuming no explicit Deny elsewhere

ForAnyValue: StringLikeIfExists in a Deny Statement

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

Given the Policy Condition:

"ForAnyValue:StringLikeIfExists": {
  "aws:TagKeys": [
    "Owner:*",
    "State:??"
  ]
}

When the Request Context has:

aws:TagKeys: null

Then the result is:

Not Denied May be allowed by another statement

Given the Policy Condition:

"ForAnyValue:StringLikeIfExists": {
  "aws:TagKeys": [
    "Owner:*",
    "State:??"
  ]
}

When the Request Context has:

aws:TagKeys: 
 - owner:Mktg
 - State:NewYork

Then the result is:

Not Denied May be allowed by another statement

Given the Policy Condition:

"ForAnyValue:StringLikeIfExists": {
  "aws:TagKeys": [
    "Owner:*",
    "State:??"
  ]
}

When the Request Context has:

aws:TagKeys: 
 - Owner:Legal
 - owner:Mktg

Then the result is:

Denied

Given the Policy Condition:

"ForAnyValue:StringLikeIfExists": {
  "aws:TagKeys": [
    "Owner:*",
    "State:??"
  ]
}

When the Request Context has:

aws:TagKeys: 
 - Owner:Legal
 - State:NY

Then the result is:

Denied

Given the Policy Condition:

"ForAnyValue:StringLikeIfExists": {
  "aws:TagKeys": [
    "Owner:*",
    "State:??"
  ]
}

When the Request Context has:

aws:TagKeys: 
 - Owner:Legal
 - State:NY
 - owner:Mktg

Then the result is:

Denied