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Andrzej Komarnicki committed Oct 5, 2023
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38 changes: 38 additions & 0 deletions .gitignore
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# Local .terraform directories
**/.terraform/*

# .tfstate files
*.tfstate
*.tfstate.*
.terraform.lock.hcl

# Crash log files
crash.log
crash.*.log

# Exclude all .tfvars files, which are likely to contain sensitive data, such as
# password, private keys, and other secrets. These should not be part of version
# control as they are data points which are potentially sensitive and subject
# to change depending on the environment.
*.tfvars
*.tfvars.json

# Ignore override files as they are usually used to override resources locally and so
# are not checked in
override.tf
override.tf.json
*_override.tf
*_override.tf.json

# Include override files you do wish to add to version control using negated pattern
# !example_override.tf

# Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan
# example: *tfplan*

# Ignore CLI configuration files
.terraformrc
terraform.rc

**/.DS_Store
.DS_Store
201 changes: 201 additions & 0 deletions LICENSE
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51 changes: 51 additions & 0 deletions README.md
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## customer-workload-identity-federation

This repo provides terraform code for customers looking to implement Google Cloud connector support for the Bishop Fox Cosmos platform.

There is a dependency on Workload Identity Federation (WIF) being enabled inside the designated project and _values.tfvars_ or env variables must be filled out with values for the following variables:

- _projectID_
- _projectNumber_

Run the following command in order to retrive the current project number:

```bash
gcloud projects describe $(gcloud config get-value core/project) --format=value\(projectNumber\)
```

**Bishop Fox** will provide the customer with the following variable values:

- AWS_accountID
- AWS_iamRole1
- AWS_iamRole2

Once the Workload Identity Pool, Workload Identity Pool AWS provider and [Connected] Service Account are provisioned you can add the service account as a principal with _Compute Viewer role_ to IAM permissions of one or more GCP projects, at the folder-level or at the organization-level.

The customer also needs to provide Bishop Fox with the WIF credentials file that is exported using the following command:

```bash
gcloud iam workload-identity-pools create-cred-config \
projects/PROJECT_NUMBER/locations/global/workloadIdentityPools/POOL_ID/providers/PROVIDER_ID \
--service-account=SERVICE_ACCOUNT_EMAIL \
--aws \
--enable-imdsv2 \
--output-file=FILEPATH.json

Replace the following values:
• PROJECT_NUMBER: The project number of the project that contains the workload identity pool
• POOL_ID: The ID of the workload identity pool, ex. bfidentitypool
• PROVIDER_ID: The ID of the workload identity pool provider, ex. bfawsprovider
• SERVICE_ACCOUNT_EMAIL: The email address of the service account
• FILEPATH: The file to save configuration to
```

Lastly, Bishop Fox requires the customer GCP Organization ID which can be retrieved using the following command:

```bash
gcloud organizations list
```

---

For more information about Workload Identity Federation best practices and requirements please see:
https://cloud.google.com/iam/docs/workload-identity-federation-with-other-clouds
63 changes: 63 additions & 0 deletions main.tf
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resource "google_iam_workload_identity_pool" "bishopfox" {
description = "managed by terraform"
disabled = false
display_name = var.displayName
project = var.projectID
workload_identity_pool_id = var.poolID
timeouts {
create = null
delete = null
update = null
}
}

resource "google_iam_workload_identity_pool_provider" "bishopfox" {
attribute_condition = null
attribute_mapping = {
"attribute.account" = "assertion.account"
"attribute.aws_role" = "assertion.arn.extract('assumed-role/{role}/')"
"google.subject" = "assertion.arn"
}
description = "managed by terraform"
disabled = false
display_name = null
project = var.projectID
workload_identity_pool_id = var.poolID
workload_identity_pool_provider_id = var.providerID
aws {
account_id = var.AWS_accountID
}
timeouts {
create = null
delete = null
update = null
}
depends_on = [google_iam_workload_identity_pool.bishopfox]
}

resource "google_service_account" "bishopfox" {
account_id = var.serviceAccountID
description = "managed by terraform"
disabled = false
display_name = var.serviceAccountDisplayName
project = var.projectID
timeouts {
create = null
}
}

resource "google_service_account_iam_policy" "bishopfox" {
policy_data = "{\"bindings\":[{\"members\":[\"principalSet://iam.googleapis.com/projects/${var.projectNumber}/locations/global/workloadIdentityPools/${var.poolID}/*\",\"principalSet://iam.googleapis.com/projects/${var.projectNumber}/locations/global/workloadIdentityPools/${var.poolID}/attribute.aws_role/${var.AWS_iamRole1}\",\"principalSet://iam.googleapis.com/projects/${var.projectNumber}/locations/global/workloadIdentityPools/${var.poolID}/attribute.aws_role/${var.AWS_iamRole2}\"],\"role\":\"roles/iam.workloadIdentityUser\"}]}"
service_account_id = google_service_account.bishopfox.id
depends_on = [google_service_account.bishopfox]
}









18 changes: 18 additions & 0 deletions outputs.tf
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output "workload_identity_pool" {
value = google_iam_workload_identity_pool.bishopfox.name
description = "Workload Identity Pool ID"
sensitive = false
}

output "workload_identity_pool_provider" {
value = google_iam_workload_identity_pool_provider.bishopfox.name
description = "Workload Identity Pool Provider Name"
sensitive = false
}

output "service_account" {
value = google_service_account.bishopfox.email
description = "WIF Service Account"
sensitive = false
}

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