Pike

Pike is a tool, to determine the minimum permissions required to run a TF/IAC run:

Pike currently supports Terraform and supports multiple providers (AWS, GCP, AZURE), Azure is the newest with AWS having the most supported resources https://github.com/JamesWoolfenden/pike/tree/master/src/mapping. Feel free to submit PR or Issue if you find an issue or even better add new resources, and then I'll take a look at merging it ASAP.

CAVEAT The policies and roles are to get you started, there are no conditions and resources are all wildcards (for AWS) this is definitely not best practice, you need will to modify these permissions to minimum required by adding these constrictions, however I also added the ability (in AWS so far) to generate short-lived credentials for your build and remotely (REMOTE) supply and invoke your builds (INVOKE).

Ideally I would like to do this for you, but these policies are determined statically, and we would need to determine the resource names that will be created and know your intentions.

Install

Download the latest binary here:

https://github.com/JamesWoolfenden/pike/releases

Install from code:

Clone repo
Run go install

Install remotely:

go install  github.com/jameswoolfenden/pike@latest

MacOS

brew tap jameswoolfenden/homebrew-tap
brew install jameswoolfenden/tap/pike

Windows

choco install pike

Docker

docker pull jameswoolfenden/pike
docker run --tty --volume /local/path/to/tf:/tf jameswoolfenden/pike scan -d /tf

https://hub.docker.com/repository/docker/jameswoolfenden/pike

Usage

Scan

To scan a directory of Terraform file:

./pike scan -d .\terraform\
{
    "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",
            "ec2:AuthorizeSecurityGroupIngress",
            "ec2:AuthorizeSecurityGroupEgress",
            "ec2:CreateSecurityGroup",
            "ec2:DescribeSecurityGroups",
            "ec2:DescribeAccountAttributes",
            "ec2:DescribeNetworkInterfaces",
            "ec2:DeleteSecurityGroup",
            "ec2:RevokeSecurityGroupEgress"
        ],
        "Resource": "*"
    }
}

You can also generate the policy as Terraform instead:

$pike scan -o terraform -d ../modules/aws/terraform-aws-activemq
resource "aws_iam_policy" "terraformXVlBzgba" {
  name        = "terraformXVlBzgba"
  path        = "/"
  description = "Add Description"

  policy = jsonencode({
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "ec2:AuthorizeSecurityGroupEgress",
                "ec2:AuthorizeSecurityGroupIngress",
                "ec2:CreateNetworkInterface",
                "ec2:CreateNetworkInterfacePermission",
                "ec2:CreateSecurityGroup",
                "ec2:CreateTags",
                "ec2:DeleteNetworkInterface",
                "ec2:DeleteNetworkInterfacePermission",
                "ec2:DeleteSecurityGroup",
                "ec2:DeleteTags",
                "ec2:DescribeAccountAttributes",
                "ec2:DescribeInternetGateways",
                "ec2:DescribeNetworkInterfaces",
                "ec2:DescribeSecurityGroups",
                "ec2:DescribeSubnets",
                "ec2:DescribeVpcs",
                "ec2:DetachNetworkInterface",
                "ec2:RevokeSecurityGroupEgress",
                "ec2:RevokeSecurityGroupIngress"
            ],
            "Resource": "*"
        },
        {
            "Sid": "VisualEditor1",
            "Effect": "Allow",
            "Action": [
                "kms:CreateKey",
                "kms:DescribeKey",
                "kms:EnableKeyRotation",
                "kms:GetKeyPolicy",
                "kms:GetKeyRotationStatus",
                "kms:ListResourceTags",
                "kms:ScheduleKeyDeletion",
                "kms:TagResource",
                "kms:UntagResource"
            ],
            "Resource": "*"
        },
        {
            "Sid": "VisualEditor2",
            "Effect": "Allow",
            "Action": [
                "mq:CreateBroker",
                "mq:CreateConfiguration",
                "mq:CreateTags",
                "mq:CreateUser",
                "mq:DeleteBroker",
                "mq:DeleteTags",
                "mq:DeleteUser",
                "mq:DescribeBroker",
                "mq:DescribeConfiguration",
                "mq:DescribeConfigurationRevision",
                "mq:DescribeUser",
                "mq:RebootBroker",
                "mq:UpdateBroker",
                "mq:UpdateConfiguration",
                "mq:UpdateUser"
            ],
            "Resource": "*"
        }
    ]
})
}

Output

If you select the -w flag, pike will write out the role/policy required to build your project into the .pike folder:

$pike scan -w -i -d .
2022/09/17 13:50:51 terraform init at .
2022/09/17 13:50:51 downloaded ip

The .pike folder will contain:

aws_iam_role.terraform_pike.tf
pike.generated_policy.tf

Which you can deploy using terraform to create the role/policy to build your IAC project.

Make

You can now deploy the policy you need directly (AWS only so far):

$pike make -d ../modules/aws/terraform-aws-apigateway/

2022/09/18 08:53:41 terraform init at ..\modules\aws\terraform-aws-apigateway\
2022/09/18 08:53:41 modules not found at ..\modules\aws\terraform-aws-apigateway\
2022/09/18 08:53:49 aws role create/updated arn:aws:iam::680235478471:role/terraform_pike_20220918071439382800000002
 arn:aws:iam::680235478471:role/terraform_pike_20220918071439382800000002

This new verb returns the ARN of the role created, and you can find the Terraform used in your .pike folder.

Invoke

Invoke is currently for triggering GitHub actions, if supplied with the workflow (defaults to main.yaml), repository and branch (defaults to main) flags, it will trigger the dispatch event.

You'll need to include the dispatch event in your workflow:

on:
  workflow_dispatch:
  push:
    branches:
      - master

To authenticate the GitHub Api you will need to set you GitHub Personal Access Token as the environment variable GITHUB_TOKEN

To Invoke a workflow it is then:

pike invoke -workflow master.yml -branch master -repository JamesWoolfenden/terraform-aws-s3

I created Invoke to be used in tandem with the new remote command which supplies temporary credentials to a workflow.

**Note The gitHub API is rate limited usually 5000 calls per hour.

pike make -d ./module/aws/terraform-aws-s3/example/examplea

Apply

Apply is an extension to make and will apply the policy and role and use that role to create your infrastructure:

pike apply -d ./module/aws/terraform-aws-s3/example/examplea -region eu-west-2

It is intended for testing and developing the permissions for Pike itself

Remote

Remote uses the core code of make and apply, to write temporary AWS credentials(only so far) into your workflow.

pike remote -d ./module/aws/terraform-aws-s3/example/examplea -region eu-west-2 -repository terraform-aws-s3

Readme

Pike can now be used to update a projects README.md file:

./pike readme -o terraform -d ..\modules\aws\terraform-aws-activemq\

This looks in the readme for the deliminators:

<!-- BEGINNING OF PRE-COMMIT-PIKE DOCS HOOK -->
<!-- END OF PRE-COMMIT-PIKE DOCS HOOK -->

and replaces is either with json or Terraform like so:

This is the policy required to build this project:

The Policy required is

{
    "Version": "2012-10-17",
    "Statement": {
        "Effect": "Allow",
        "Action": [
            "mq:CreateTags",
            "mq:DeleteTags",
            "ec2:DescribeInternetGateways",
            "ec2:DescribeAccountAttributes",
            "ec2:DescribeVpcs",
            "ec2:DescribeSubnets",
            "ec2:DescribeSecurityGroups",
            "ec2:CreateNetworkInterface",
            "ec2:CreateNetworkInterfacePermission",
            "ec2:DeleteNetworkInterfacePermission",
            "ec2:DetachNetworkInterface",
            "ec2:DeleteNetworkInterface",
            "mq:CreateBroker",
            "mq:DescribeBroker",
            "mq:DescribeUser",
            "mq:UpdateBroker",
            "mq:DeleteBroker",
            "mq:CreateConfiguration",
            "mq:UpdateConfiguration",
            "mq:DescribeConfiguration",
            "mq:DescribeConfigurationRevision",
            "mq:RebootBroker",
            "ec2:CreateTags",
            "ec2:DeleteTags",
            "ec2:CreateSecurityGroup",
            "ec2:DescribeNetworkInterfaces",
            "ec2:DeleteSecurityGroup",
            "ec2:RevokeSecurityGroupEgress",
            "kms:TagResource",
            "kms:UntagResource",
            "kms:EnableKeyRotation",
            "kms:CreateKey",
            "kms:DescribeKey",
            "kms:GetKeyPolicy",
            "kms:GetKeyRotationStatus",
            "kms:ListResourceTags",
            "kms:ScheduleKeyDeletion"
        ],
        "Resource": "*"
    }
}

You can see an example here https://github.com/jamesWoolfenden/terraform-aws-activemq#policy.

Compare

Want to check your deployed IAM policy against your IAC requirement?

$./pike compare -d ../modules/aws/terraform-aws-appsync -a arn:aws:iam::680235478471:policy/basic

IAM Policy arn:aws:iam::680235478471:policy/basic versus Local ../modules/aws/terraform-aws-appsync
 {
   "Statement": [
     0: {
       "Action": [
-        0: "kinesisvideo:CreateStream"
+        0: "firehose:CreateDeliveryStream"
+        0: "firehose:CreateDeliveryStream"
+        1: "firehose:DeleteDeliveryStream"
+        2: "firehose:DescribeDeliveryStream"
+        3: "firehose:ListTagsForDeliveryStream"
+        4: "iam:AttachRolePolicy"
+        5: "iam:CreateRole"
+        6: "iam:DeleteRole"
+        7: "iam:DetachRolePolicy"
+        8: "iam:GetRole"
+        9: "iam:ListAttachedRolePolicies"
+        10: "iam:ListInstanceProfilesForRole"
+        11: "iam:ListRolePolicies"
+        12: "iam:PassRole"
+        13: "iam:TagRole"
+        14: "kms:CreateKey"
+        15: "kms:DescribeKey"
+        16: "kms:EnableKeyRotation"
+        17: "kms:GetKeyPolicy"
+        18: "kms:GetKeyRotationStatus"
+        19: "kms:ListResourceTags"
+        20: "kms:ScheduleKeyDeletion"
+        21: "logs:AssociateKmsKey"
+        22: "logs:CreateLogGroup"
+        23: "logs:DeleteLogGroup"
+        24: "logs:DeleteRetentionPolicy"
+        25: "logs:DescribeLogGroups"
+        26: "logs:DisassociateKmsKey"
+        27: "logs:ListTagsLogGroup"
+        28: "logs:PutRetentionPolicy"
+        29: "s3:CreateBucket"
+        30: "s3:DeleteBucket"
+        31: "s3:GetAccelerateConfiguration"
+        32: "s3:GetBucketAcl"
+        33: "s3:GetBucketCORS"
+        34: "s3:GetBucketLogging"
+        35: "s3:GetBucketObjectLockConfiguration"
+        36: "s3:GetBucketPolicy"
+        37: "s3:GetBucketPublicAccessBlock"
+        38: "s3:GetBucketRequestPayment"
+        39: "s3:GetBucketTagging"
+        40: "s3:GetBucketVersioning"
+        41: "s3:GetBucketWebsite"
+        42: "s3:GetEncryptionConfiguration"
+        43: "s3:GetLifecycleConfiguration"
+        44: "s3:GetObject"
+        45: "s3:GetObjectAcl"
+        46: "s3:GetReplicationConfiguration"
+        47: "s3:ListAllMyBuckets"
+        48: "s3:ListBucket"
+        49: "s3:PutBucketAcl"
+        50: "s3:PutBucketPublicAccessBlock"
+        51: "s3:PutEncryptionConfiguration"
+        52: "wafv2:CreateWebACL"
+        53: "wafv2:DeleteWebACL"
+        54: "wafv2:GetWebACL"
       ],
       "Effect": "Allow",
       "Resource": "*",
-      "Sid": ""
+      "Sid": "VisualEditor0"
     }
   ],
   "Version": "2012-10-17"
 }

Help

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

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

VERSION:
   v0.2.1

AUTHOR:
   James Woolfenden <[email protected]>

COMMANDS:
   apply, a    Create a policy and use it to instantiate the IAC
   compare, c  policy comparison of deployed versus IAC
   invoke, i   Triggers a gitHub action specified with the workflow flag
   make, m     make the policy/role required for this IAC to deploy
   readme, r   Looks in dir for a README.md and updates it with the Policy required to build the code
   remote, m   Create/Update the Policy and set credentials/secret for Github Action
   scan, s     scan a directory for IAM code
   version, v  Outputs the application version
   watch, w    Waits for policy update
   help, h     Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --help, -h     show help (default: false)
   --version, -v  print the version (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

Once you have added the json import above you just need to update the lookup table, so we can read it and get the permissions:

func GetAWSResourcePermissions(result template) []interface{} {
    TFLookup := map[string]interface{}{
        "aws_s3_bucket":            awsS3Bucket,
        "aws_s3_bucket_acl":        awsS3BucketACL,
+         "aws_security_group":       awsSecurityGroup,

Also add an example Terraform file into the folder terraform/backups.

Related Tools

https://github.com/iann0036/iamlive

Name		Name	Last commit message	Last commit date
Latest commit History 359 Commits
.github		.github
.run		.run
src		src
terraform		terraform
testdata		testdata
.gitignore		.gitignore
.goreleaser.yml		.goreleaser.yml
.markdownlint.json		.markdownlint.json
.pre-commit-config.yaml		.pre-commit-config.yaml
.pre-commit-hooks.yaml		.pre-commit-hooks.yaml
CONTRIBUTING.md		CONTRIBUTING.md
Dockerfile		Dockerfile
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
SECURITY.md		SECURITY.md
bump.ps1		bump.ps1
entrypoint.sh		entrypoint.sh
go.mod		go.mod
go.sum		go.sum
main.go		main.go
pike.jfif		pike.jfif
resource.ps1		resource.ps1
set-version.sh		set-version.sh
todo.md		todo.md
todo_azure.md		todo_azure.md
todo_gcp.md		todo_gcp.md

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