Merge pull request 'feat/allow-extra-root-policies' (#3) from feat/allow-extra-root-policies into main

Reviewed-on: #3

README.md

@@ -44,15 +44,16 @@ No modules.
 | [vault_identity_group.this](https://registry.terraform.io/providers/hashicorp/vault/latest/docs/resources/identity_group) | resource |
 | [vault_policy.extra](https://registry.terraform.io/providers/hashicorp/vault/latest/docs/resources/policy) | resource |
 | [vault_policy.root](https://registry.terraform.io/providers/hashicorp/vault/latest/docs/resources/policy) | resource |
+| [vault_policy_document.root](https://registry.terraform.io/providers/hashicorp/vault/latest/docs/data-sources/policy_document) | data source |
 
 ### Inputs
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
-| <a name="input_additional_roles"></a> [additional_roles](#input_additional_roles) | A map of additional role names, with the path to the associated policy file to add for this tenant.<br>    A separate approle auth method is created for this tenant (mounted at auth/<prefix>-approle) including all the roles declared in this variable.<br>    The variable should look like:<br>    additional_roles = {<br>      devs = {<br>        policy_file = "/some/path/to/policy.hcl"<br>      }<br>      admins = {...}<br>    } | <pre>map(object({<br>    policy_file = string<br>  }))</pre> | `{}` | no |
+| <a name="input_additional_roles"></a> [additional_roles](#input_additional_roles) | A map of additional role names, with the path to the associated policy file to add for this tenant.<br>    A separate approle auth method is created for this tenant (mounted at auth/<prefix>-approle) including all the roles declared in this variable.<br>    The variable should look like:<br>    additional_roles = {<br>      devs = file("path/to/policy.hcl")<br>      admins = data.vault_policy_document.admins.hcl<br>    } | `map(string)` | `{}` | no |
 | <a name="input_name"></a> [name](#input_name) | The name of the tenant you want to create | `string` | n/a | yes |
 | <a name="input_prefix"></a> [prefix](#input_prefix) | The prefix to use for the tenant in vault (this will prefix mount points, policies, etc..) | `string` | n/a | yes |
-| <a name="input_root_policy_file"></a> [root_policy_file](#input_root_policy_file) | The path to the admin policy file for this tenant | `string` | `null` | no |
+| <a name="input_root_policy_extra_rules"></a> [root_policy_extra_rules](#input_root_policy_extra_rules) | A map of additional policies to attach to the root policy. These are merged with the default policies for the root role so that you can customize it to your needs | <pre>map(<br>    object({<br>      path                = string<br>      capabilities        = list(string)<br>      description         = optional(string)<br>      required_parameters = optional(list(string))<br>      allowed_parameter   = optional(map(list(any)))<br>      denied_parameter    = optional(map(list(any)))<br>      min_wrapping_ttl    = optional(number)<br>      max_wrapping_ttl    = optional(number)<br>    })<br>  )</pre> | `{}` | no |
 
 ### Outputs
 

extra_policies.tf

@@ -20,7 +20,7 @@ resource "vault_policy" "extra" {
   for_each = var.additional_roles
 
   name   = "${var.prefix}-${each.key}"
-  policy = file(each.value.policy_file)
+  policy = each.value
 }
 
 resource "vault_identity_entity" "extra" {

root.tf

@@ -1,3 +1,64 @@
+locals {
+  root_policy_default_rules = {
+    tenant_prefix_rw = {
+      path         = "${var.prefix}/*"
+      capabilities = ["create", "update", "read", "delete", "list"]
+    }
+    tenant_prefix_mount = {
+      path         = "sys/mounts/${var.prefix}/*"
+      capabilities = ["create", "update", "read", "delete", "list"]
+    }
+    tenant_prefix_remount = {
+      path         = "sys/remount"
+      capabilities = ["update", "sudo"]
+      allowed_parameter = {
+        "from" = ["${var.prefix}/*"]
+        "to"   = ["${var.prefix}/*"]
+      }
+    }
+    tenant_prefix_remount_status = {
+      path         = "sys/remount/status/*"
+      capabilities = ["read"]
+    }
+  }
+  root_policy_rules = merge(local.root_policy_default_rules, var.root_policy_extra_rules)
+}
+
+data "vault_policy_document" "root" {
+  dynamic "rule" {
+    for_each = local.root_policy_rules
+    content {
+      path                = rule.value.path
+      capabilities        = rule.value.capabilities
+      description         = try(rule.value.description, null)
+      min_wrapping_ttl    = try(rule.value.min_wrapping_ttl, null)
+      max_wrapping_ttl    = try(rule.value.max_wrapping_ttl, null)
+      required_parameters = try(rule.value.required_parameters, [])
+
+      dynamic "allowed_parameter" {
+        for_each = try(rule.value.allowed_parameter, null) != null ? rule.value.allowed_parameter : {}
+        content {
+          key   = allowed_parameter.key
+          value = allowed_parameter.value
+        }
+      }
+
+      dynamic "denied_parameter" {
+        for_each = try(rule.value.denied_parameter, null) != null ? rule.value.denied_parameter : {}
+        content {
+          key   = denied_parameter.key
+          value = denied_parameter.value
+        }
+      }
+    }
+  }
+}
+
+resource "vault_policy" "root" {
+  name   = "${var.name}-root"
+  policy = data.vault_policy_document.root.hcl
+}
+
 resource "vault_approle_auth_backend_role" "root" {
   backend        = vault_auth_backend.approle.path
   role_name      = "${var.name}-root"
@@ -12,11 +73,6 @@ resource "vault_approle_auth_backend_role_secret_id" "root" {
   secret_id = random_uuid.root_secret_id.result
 }
 
-resource "vault_policy" "root" {
-  name   = "${var.name}-root"
-  policy = var.root_policy_file == null ? templatefile("${path.module}/policies/root.policy.hcl", { tenant_prefix = var.prefix }) : file(var.root_policy_file)
-}
-
 resource "vault_identity_entity" "root" {
   name = "${var.prefix}-root"
 }

variables.tf

@@ -12,26 +12,33 @@ variable "prefix" {
   description = "The prefix to use for the tenant in vault (this will prefix mount points, policies, etc..)"
 }
 
-variable "root_policy_file" {
-  type        = string
-  default     = null
-  description = "The path to the admin policy file for this tenant"
-}
-
 variable "additional_roles" {
-  type = map(object({
-    policy_file = string
-  }))
+  type        = map(string)
   default     = {}
   description = <<EOT
     A map of additional role names, with the path to the associated policy file to add for this tenant.
     A separate approle auth method is created for this tenant (mounted at auth/<prefix>-approle) including all the roles declared in this variable.
     The variable should look like:
     additional_roles = {
-      devs = {
-        policy_file = "/some/path/to/policy.hcl"
-      }
-      admins = {...}
+      devs = file("path/to/policy.hcl")
+      admins = data.vault_policy_document.admins.hcl
     }
   EOT
 }
+
+variable "root_policy_extra_rules" {
+  type = map(
+    object({
+      path                = string
+      capabilities        = list(string)
+      description         = optional(string)
+      required_parameters = optional(list(string))
+      allowed_parameter   = optional(map(list(any)))
+      denied_parameter    = optional(map(list(any)))
+      min_wrapping_ttl    = optional(number)
+      max_wrapping_ttl    = optional(number)
+    })
+  )
+  description = "A map of additional policies to attach to the root policy. These are merged with the default policies for the root role so that you can customize it to your needs"
+  default     = {}
+}