Pike

Pike is a tool, to determine the minimum permissions required to run a TF/IAC run: Still very much under development, I intend it to:

• run in ci - limit external outbound connections
• run on a path or a file
• determines permission drift
• least privilege enabler
• policy creator
• test policy against environment

It currently supports Terraform and can support multiple providers but focus is only on AWS at present.

Current issues:

• The current HCL parser needs to be replaced with one that ignores variables. We dont care about them yet.

Usage

Scan a directory of terraform file

./pike -d .\terraform\ scan
{
    "Version": "2012-10-17",
    "Statement": {
        "Effect": "Allow",
        "Action": [
            "ec2:MonitorInstances",
            "ec2:UnmonitorInstances",
            "ec2:DescribeInstances",
            "ec2:DescribeTags",
            "ec2:DescribeInstanceAttribute",
            "ec2:DescribeVolumes",
            "ec2:DescribeInstanceTypes",
            "ec2:RunInstances",
            "ec2:DescribeInstanceCreditSpecifications",
            "ec2:StopInstances",
            "ec2:StartInstances",
            "ec2:ModifyInstanceAttribute",
            "ec2:TerminateInstances",
            "s3:GetBucketObjectLockConfiguration",
            "s3:PutBucketObjectLockConfiguration",
            "s3:PutObjectLegalHold",
            "s3:PutObjectRetention",
            "s3:PutObject",
            "s3:DeleteBucket",
            "s3:CreateBucket",
            "s3:GetLifecycleConfiguration",
            "s3:GetBucketTagging",
            "s3:GetBucketWebsite",
            "s3:GetBucketLogging",
            "s3:ListBucket",
            "s3:GetAccelerateConfiguration",
            "s3:GetBucketVersioning",
            "s3:GetBucketAcl",
            "s3:GetBucketPolicy",
            "s3:GetReplicationConfiguration",
            "s3:GetObjectAcl",
            "s3:GetObject",
            "s3:GetEncryptionConfiguration",
            "s3:GetBucketRequestPayment",
            "s3:GetBucketCORS",
            "ec2:AuthorizeSecurityGroupIngress",
            "ec2:AuthorizeSecurityGroupEgress",
            "ec2:CreateSecurityGroup",
            "ec2:DescribeSecurityGroups",
            "ec2:DescribeAccountAttributes",
            "ec2:DescribeNetworkInterfaces",
            "ec2:DeleteSecurityGroup",
            "ec2:RevokeSecurityGroupEgress"
        ],
        "Resource": "*"
    }
}

$./pike -h
NAME:
   pike - Generate IAM policy from your IAC code

USAGE:
   pike [global options] command [command options] [arguments...]

COMMANDS:
   scan, s  scan
   help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --config FILE, -c FILE       Load configuration from FILE
   --directory value, -d value  Directory to scan
   --help, -h                   show help (default: false)

Building

go build

or

Make build

Extending

Determine and Create IAM mapping file, working out the permissions required for your resource: e.g. aws_security_group.json

[
  {
    "apply": [
      "ec2:CreateSecurityGroup",
      "ec2:DescribeSecurityGroups",
      "ec2:DescribeAccountAttributes",
      "ec2:DescribeNetworkInterfaces",
      "ec2:DeleteSecurityGroup",
      "ec2:RevokeSecurityGroupEgress"
    ],
    "attributes": {
      "ingress": [
        "ec2:AuthorizeSecurityGroupIngress",
        "ec2:AuthorizeSecurityGroupEgress"
      ],
      "tags": [
        "ec2:CreateTags",
        "ec2:DeleteTags"
      ]
    },
    "destroy": [
      "ec2:DeleteSecurityGroup"
    ],
    "modify": [],
    "plan": []
  }
]

Add Import mapping file

Update files.go with:

//go:embed aws_security_group.json
var securityGroup []byte

Add to provider Scan

func GetAWSResourcePermissions(result template) []interface{} {
    myAttributes := GetAttributes(result)
    var Permissions []interface{}
    switch result.Resource.name {
    case "aws_s3_bucket":
       Permissions = GetPermissionMap(s3, myAttributes)
    case "aws_instance":
       Permissions = GetPermissionMap(ec2raw, myAttributes)
+   case "aws_security_group":
+      Permissions = GetPermissionMap(securityGroup, myAttributes)

Related Tools

https://github.com/iann0036/iamlive