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StringLikeIfExists

StringLikeIfExists

StringLikeIfExists compares a string 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 can be absent, but if present it must match at least one of the strings in your policy.

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

StringLikeIfExists in an Allow Statement

Given the Policy Condition: 
"StringLikeIfExists": {
  "aws:RequestTag/Department": [
    "Finance:*",
    "Sales:??"
  ]
}
When the Request Context has:
aws:RequestTag/Department: null
Then the result is:
Allowed Allowed Assuming no explicit Deny elsewhere
Given the Policy Condition: 
"StringLikeIfExists": {
  "aws:RequestTag/Department": [
    "Finance:*",
    "Sales:??"
  ]
}
When the Request Context has:
aws:RequestTag/Department:
   Finance:AccountsPayable
Then the result is:
Allowed Allowed Assuming no explicit Deny elsewhere
Given the Policy Condition: 
"StringLikeIfExists": {
  "aws:RequestTag/Department": [
    "Finance:*",
    "Sales:??"
  ]
}
When the Request Context has:
aws:RequestTag/Department: finance:AP
Then the result is:
Not Allowed Not Allowed Statement does not apply

StringLikeIfExists in a Deny Statement

Given the Policy Condition: 
"StringLikeIfExists": {
  "aws:RequestTag/Department": [
    "Finance:*",
    "Sales:??"
  ]
}
When the Request Context has:
aws:RequestTag/Department: null
Then the result is:
Denied Denied
Given the Policy Condition: 
"StringLikeIfExists": {
  "aws:RequestTag/Department": [
    "Finance:*",
    "Sales:??"
  ]
}
When the Request Context has:
aws:RequestTag/Department:
   Finance:AccountsPayable
Then the result is:
Denied Denied
Given the Policy Condition: 
"StringLikeIfExists": {
  "aws:RequestTag/Department": [
    "Finance:*",
    "Sales:??"
  ]
}
When the Request Context has:
aws:RequestTag/Department: finance:AP
Then the result is:
Not Denied Not Denied May be allowed by another statement