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How can I access an API Gateway private REST API in another AWS account using an interface VPC endpoint

topo

apigw-cross-account-private-endpoint-png-1.png

In Account A

  • create vpc & execute-api endpoint
  • no peering or tgw needed

In API gateway Service Account

access-control-with-cidr

  • works. 
    {
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Deny",
            "Principal": "*",
            "Action": "execute-api:Invoke",
            "Resource": "execute-api:/*/*/*",
            "Condition": {
                "NotIpAddress": {
                    "aws:SourceIp": "10.251.0.0/16"
                }
            }
        },
        {
            "Effect": "Allow",
            "Principal": "*",
            "Action": "execute-api:Invoke",
            "Resource": "execute-api:/*/*/*"
        }
    ]
}

access-control-with-vpce

  • works.
    {
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Deny",
      "Principal": "*",
      "Action": "execute-api:Invoke",
      "Resource": "execute-api:/*/*/*",
      "Condition": {
        "StringNotEquals": {
          "aws:sourceVpce": ["vpce-0e8c7xxb45","vpce-05d2xx259"]
        }
      }
    },
    {
      "Effect": "Allow",
      "Principal": "*",
      "Action": "execute-api:Invoke",
      "Resource": "execute-api:/*/*/*"
    }
  ]
}

access-control-with-vpc

  • works
    {
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Deny",
            "Principal": "*",
            "Action": "execute-api:Invoke",
            "Resource": "execute-api:/*/*/*",
            "Condition": {
                "StringNotEquals": {
                    "aws:sourceVpc": "vpc-0204axxx0"
                }
            }
        },
        {
            "Effect": "Allow",
            "Principal": "*",
            "Action": "execute-api:Invoke",
            "Resource": "execute-api:/*/*/*"
        }
    ]
}

deploy

  • redeploy after you change Resource Policy

refer