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ForAllValues:StringNotEqualsIfExists

Warning:

ForAllValues: StringNotEqualsIfExists 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: StringNotEquals instead so your coworkers don't hate you.

ForAllValues: StringNotEqualsIfExists

ForAllValues: StringNotEqualsIfExists compares a list of strings in a request to a list of strings in your policy. The comparison is case sensitive.

To match a request, the context key can be absent, but if it is present, none of the strings in the request can match any string strings in your policy.

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

ForAllValues: StringNotEqualsIfExists in an Allow Statement

Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys: null
Then the result is:
Allowed Allowed Assuming no explicit Deny elsewhere
Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys:
 - DataClass
 - Owner
Then the result is:
Not Allowed Not Allowed Statement does not apply
Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys:
 - DataClass
 - Dept
Then the result is:
Not Allowed Not Allowed Statement does not apply
Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys:
 - Dept
Then the result is:
Allowed Allowed Assuming no explicit Deny elsewhere
Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys:
 - Dept
 - SIC
Then the result is:
Allowed Allowed Assuming no explicit Deny elsewhere
Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys:
 - Dept
 - SIC
 - DataClass
Then the result is:
Not Allowed Not Allowed Statement does not apply

ForAllValues: StringNotEqualsIfExists in a Deny Statement

Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys: null
Then the result is:
Denied Denied
Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys:
 - DataClass
 - Owner
Then the result is:
Not Denied Not Denied May be allowed by another statement
Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys:
 - DataClass
 - Dept
Then the result is:
Not Denied Not Denied May be allowed by another statement
Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys:
 - Dept
Then the result is:
Denied Denied
Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys:
 - Dept
 - SIC
Then the result is:
Denied Denied
Given the Policy Condition: 
"ForAllValues:StringNotEqualsIfExists": {
  "aws:TagKeys": [
    "DataClass",
    "Owner"
  ]
}
When the Request Context has:
aws:TagKeys:
 - Dept
 - SIC
 - DataClass
Then the result is:
Not Denied Not Denied May be allowed by another statement