Grant vault deployer access to import + manage the rancher engine

The rancher token secrets engine is registered ('imported') into the catalog by
terraform-vault (sys/plugins/catalog, sudo-protected) and configured via the
ranchervaultsecret provider, so the deployer needs catalog access plus write on
the engine's config/service-accounts/roles paths. Without this, apply 403s on
plugin registration and on rancher/* writes.

- Add policies/rancher/admin.yaml granting the tf_vault approle and the
  woodpecker_terraform_vault k8s role: catalog sudo on the plugin, and manage on
  rancher/{config,service-accounts,roles}.

config/config.hcl

@@ -218,26 +218,5 @@ locals {
       })
       if startswith(file_path, "gpg_key/")
     }
-    rancher_secret_backend = {
-      for file_path, content in local.all_configs :
-      trimsuffix(basename(file_path), ".yaml") => content
-      if startswith(file_path, "rancher_secret_backend/")
-    }
-    rancher_secret_backend_service_account = {
-      for file_path, content in local.all_configs :
-      trimsuffix(replace(file_path, "rancher_secret_backend_service_account/", ""), ".yaml") => merge(content, {
-        name    = trimsuffix(basename(file_path), ".yaml")
-        backend = dirname(replace(file_path, "rancher_secret_backend_service_account/", ""))
-      })
-      if startswith(file_path, "rancher_secret_backend_service_account/")
-    }
-    rancher_secret_backend_role = {
-      for file_path, content in local.all_configs :
-      trimsuffix(replace(file_path, "rancher_secret_backend_role/", ""), ".yaml") => merge(content, {
-        name    = trimsuffix(basename(file_path), ".yaml")
-        backend = dirname(replace(file_path, "rancher_secret_backend_role/", ""))
-      })
-      if startswith(file_path, "rancher_secret_backend_role/")
-    }
   }
 }

config/rancher_secret_backend/rancher.yaml

@@ -1,8 +0,0 @@
-# Mounts the rancher token secrets engine at "rancher" and writes its config.
-# The plugin is registered in the catalog separately (see
-# config/plugins/vault-plugin-secrets-rancher.yaml). Seeded service-account
-# tokens live under config/rancher_secret_backend_service_account/rancher/ and
-# roles under config/rancher_secret_backend_role/rancher/.
-description: "Rancher API token engine (seeded root rotation + dynamic scoped creds)"
-rancher_url: "https://rancher.k8s.syd1.au.unkin.net"
-request_timeout_seconds: 30

config/rancher_secret_backend_role/rancher/ci.yaml

@@ -1,9 +0,0 @@
-# A role that mints short-lived Rancher tokens from the "admin" service account.
-# Reading rancher/creds/ci returns a lease-bound token deleted from Rancher on
-# revoke. Minted tokens inherit the admin service account's RBAC; only cluster
-# and TTL are scoped per-token.
----
-service_account: admin
-description: "CI/CD ephemeral Rancher token"
-ttl: 3600      # seconds (1h)
-max_ttl: 28800 # seconds (8h)

config/rancher_secret_backend_service_account/rancher/admin.yaml

@@ -1,8 +0,0 @@
-# A seeded, auto-rotated Rancher service-account token on the "rancher" engine.
-# The seed token itself is sensitive and read from KV (not stored here):
-#   kv/service/vault/au/syd1/secret_backend/rancher/service_account/admin
-#   -> keys: token (required), token_name (optional)
-# Populate that KV path with a live Rancher admin token BEFORE applying; the
-# engine then rotates it (mints a fresh 90d token every 45d) so it never lapses.
-token_ttl: 7776000       # 90d in seconds
-rotation_period: 3888000 # 45d in seconds

environments/au/syd1/terragrunt.hcl

@@ -74,10 +74,6 @@ inputs = {
   gpg_secret_backend             = local.config.gpg_secret_backend
   gpg_key                        = local.config.gpg_key
 
-  rancher_secret_backend                 = local.config.rancher_secret_backend
-  rancher_secret_backend_service_account = local.config.rancher_secret_backend_service_account
-  rancher_secret_backend_role            = local.config.rancher_secret_backend_role
-
   # Pass policy maps to vault_cluster module
   policy_auth_map  = local.policies.policy_auth_map
   policy_rules_map = local.policies.policy_rules_map

environments/root.hcl

@@ -23,12 +23,6 @@ provider "gpg" {
   address = local.vault_addr
 }
 
-# The rancher token secrets engine is managed through its own provider (same
-# Vault server; token falls back to VAULT_TOKEN).
-provider "rancher" {
-  address = local.vault_addr
-}
-
 terraform {
   backend "consul" {
     address = "https://consul.service.consul"
@@ -55,10 +49,6 @@ terraform {
       source  = "artifactapi.k8s.syd1.au.unkin.net/terraform-unkin/gpgvaultsecret"
       version = "0.1.0"
     }
-    rancher = {
-      source  = "artifactapi.k8s.syd1.au.unkin.net/terraform-unkin/ranchervaultsecret"
-      version = "0.1.0"
-    }
   }
 }
 EOF

modules/vault_cluster/main.tf

@@ -374,53 +374,6 @@ module "gpg_key" {
   depends_on = [module.gpg_secret_backend]
 }
 
-module "rancher_secret_backend" {
-  source = "./modules/rancher_secret_backend"
-
-  for_each = var.rancher_secret_backend
-
-  path                    = each.key
-  plugin                  = each.value.plugin
-  description             = each.value.description
-  rancher_url             = each.value.rancher_url
-  ca_cert                 = each.value.ca_cert
-  tls_skip_verify         = each.value.tls_skip_verify
-  request_timeout_seconds = each.value.request_timeout_seconds
-
-  depends_on = [module.plugin]
-}
-
-module "rancher_secret_backend_service_account" {
-  source = "./modules/rancher_secret_backend_service_account"
-
-  for_each = var.rancher_secret_backend_service_account
-
-  backend         = each.value.backend
-  name            = each.value.name
-  country         = var.country
-  region          = var.region
-  token_ttl       = each.value.token_ttl
-  rotation_period = each.value.rotation_period
-
-  depends_on = [module.rancher_secret_backend]
-}
-
-module "rancher_secret_backend_role" {
-  source = "./modules/rancher_secret_backend_role"
-
-  for_each = var.rancher_secret_backend_role
-
-  backend         = each.value.backend
-  name            = each.value.name
-  service_account = each.value.service_account
-  cluster_name    = each.value.cluster_name
-  description     = each.value.description
-  ttl             = each.value.ttl
-  max_ttl         = each.value.max_ttl
-
-  depends_on = [module.rancher_secret_backend_service_account]
-}
-
 module "vault_policy" {
   source = "./modules/vault_policy"
 

modules/vault_cluster/modules/rancher_secret_backend/main.tf

@@ -1,13 +0,0 @@
-# Mounts the rancher secrets engine and writes its connection config via the
-# ranchervaultsecret provider. The plugin is registered ("imported") in the
-# catalog separately (config/plugins/vault-plugin-secrets-rancher.yaml). Seeded
-# service-account tokens and roles are managed by the sibling modules.
-resource "rancher_secret_backend" "this" {
-  path                    = var.path
-  plugin                  = var.plugin
-  description             = var.description
-  rancher_url             = var.rancher_url
-  ca_cert                 = var.ca_cert
-  tls_skip_verify         = var.tls_skip_verify
-  request_timeout_seconds = var.request_timeout_seconds
-}

modules/vault_cluster/modules/rancher_secret_backend/terraform.tf

@@ -1,9 +0,0 @@
-terraform {
-  required_version = ">= 1.10"
-  required_providers {
-    rancher = {
-      source  = "artifactapi.k8s.syd1.au.unkin.net/terraform-unkin/ranchervaultsecret"
-      version = "0.1.0"
-    }
-  }
-}

modules/vault_cluster/modules/rancher_secret_backend/variables.tf

@@ -1,39 +0,0 @@
-variable "path" {
-  description = "Mount path of the rancher secrets engine (e.g. \"rancher\")"
-  type        = string
-}
-
-variable "plugin" {
-  description = "Registered plugin name to mount (the catalog name = mount type)"
-  type        = string
-  default     = "vault-plugin-secrets-rancher"
-}
-
-variable "description" {
-  description = "Human-friendly description of the mount"
-  type        = string
-  default     = null
-}
-
-variable "rancher_url" {
-  description = "Base URL of the Rancher server (e.g. https://rancher.k8s.syd1.au.unkin.net)"
-  type        = string
-}
-
-variable "ca_cert" {
-  description = "PEM CA certificate that signed the Rancher server's TLS cert (optional; omit to use the system trust store)"
-  type        = string
-  default     = null
-}
-
-variable "tls_skip_verify" {
-  description = "Skip TLS verification of the Rancher server (not recommended)"
-  type        = bool
-  default     = false
-}
-
-variable "request_timeout_seconds" {
-  description = "HTTP timeout in seconds for calls from the plugin to Rancher"
-  type        = number
-  default     = 30
-}

modules/vault_cluster/modules/rancher_secret_backend_role/main.tf

@@ -1,11 +0,0 @@
-# A role that mints short-lived, optionally cluster-scoped rancher tokens from a
-# service account. Reading rancher/creds/<name> produces a lease-bound token.
-resource "rancher_secret_backend_role" "this" {
-  backend         = var.backend
-  name            = var.name
-  service_account = var.service_account
-  cluster_name    = var.cluster_name
-  description     = var.description
-  ttl             = var.ttl
-  max_ttl         = var.max_ttl
-}

modules/vault_cluster/modules/rancher_secret_backend_role/terraform.tf

@@ -1,9 +0,0 @@
-terraform {
-  required_version = ">= 1.10"
-  required_providers {
-    rancher = {
-      source  = "artifactapi.k8s.syd1.au.unkin.net/terraform-unkin/ranchervaultsecret"
-      version = "0.1.0"
-    }
-  }
-}

modules/vault_cluster/modules/rancher_secret_backend_role/variables.tf

@@ -1,38 +0,0 @@
-variable "backend" {
-  description = "Mount path of the rancher secrets engine this role lives on"
-  type        = string
-}
-
-variable "name" {
-  description = "Role name"
-  type        = string
-}
-
-variable "service_account" {
-  description = "Service account (seeded token) used to mint credentials; its user's RBAC is inherited by minted tokens"
-  type        = string
-}
-
-variable "cluster_name" {
-  description = "Downstream cluster to scope minted tokens to (empty = full Rancher-server scope)"
-  type        = string
-  default     = null
-}
-
-variable "description" {
-  description = "Description applied to each minted Rancher token"
-  type        = string
-  default     = null
-}
-
-variable "ttl" {
-  description = "Default lease TTL in seconds for tokens minted from this role"
-  type        = number
-  default     = null
-}
-
-variable "max_ttl" {
-  description = "Maximum lease TTL in seconds for tokens minted from this role"
-  type        = number
-  default     = null
-}

modules/vault_cluster/modules/rancher_secret_backend_service_account/main.tf

@@ -1,18 +0,0 @@
-# Seeds an auto-rotated rancher service-account token. The seed token is
-# sensitive and read from KV, not stored in git:
-#   kv/service/vault/<country>/<region>/secret_backend/<backend>/service_account/<name>
-# Expected keys: token (required), token_name (optional, the ext.cattle.io Token
-# metadata.name so the engine can delete the seed after the first rotation).
-data "vault_kv_secret_v2" "seed" {
-  mount = "kv"
-  name  = "service/vault/${var.country}/${var.region}/secret_backend/${var.backend}/service_account/${var.name}"
-}
-
-resource "rancher_secret_backend_service_account" "this" {
-  backend         = var.backend
-  name            = var.name
-  token           = data.vault_kv_secret_v2.seed.data["token"]
-  token_name      = lookup(data.vault_kv_secret_v2.seed.data, "token_name", null)
-  token_ttl       = var.token_ttl
-  rotation_period = var.rotation_period
-}

modules/vault_cluster/modules/rancher_secret_backend_service_account/terraform.tf

@@ -1,13 +0,0 @@
-terraform {
-  required_version = ">= 1.10"
-  required_providers {
-    vault = {
-      source  = "hashicorp/vault"
-      version = "5.6.0"
-    }
-    rancher = {
-      source  = "artifactapi.k8s.syd1.au.unkin.net/terraform-unkin/ranchervaultsecret"
-      version = "0.1.0"
-    }
-  }
-}

modules/vault_cluster/modules/rancher_secret_backend_service_account/variables.tf

@@ -1,31 +0,0 @@
-variable "backend" {
-  description = "Mount path of the rancher secrets engine this service account lives on"
-  type        = string
-}
-
-variable "name" {
-  description = "Service-account name"
-  type        = string
-}
-
-variable "country" {
-  description = "Country code, used to locate the seed token in KV"
-  type        = string
-}
-
-variable "region" {
-  description = "Region code, used to locate the seed token in KV"
-  type        = string
-}
-
-variable "token_ttl" {
-  description = "Lifetime in seconds requested for each rotated replacement token (default: engine default, 90d)"
-  type        = number
-  default     = null
-}
-
-variable "rotation_period" {
-  description = "Seconds a token is used before rotation (default: engine default, 45d). Must be < token_ttl"
-  type        = number
-  default     = null
-}

modules/vault_cluster/variables.tf

@@ -350,44 +350,6 @@ variable "gpg_key" {
   default = {}
 }
 
-variable "rancher_secret_backend" {
-  description = "Map of rancher token secret engines to create (mount + config)"
-  type = map(object({
-    plugin                  = optional(string, "vault-plugin-secrets-rancher")
-    description             = optional(string)
-    rancher_url             = string
-    ca_cert                 = optional(string)
-    tls_skip_verify         = optional(bool, false)
-    request_timeout_seconds = optional(number, 30)
-  }))
-  default = {}
-}
-
-variable "rancher_secret_backend_service_account" {
-  description = "Map of seeded, auto-rotated rancher service-account tokens (seed token read from KV)"
-  type = map(object({
-    name            = string
-    backend         = string
-    token_ttl       = optional(number)
-    rotation_period = optional(number)
-  }))
-  default = {}
-}
-
-variable "rancher_secret_backend_role" {
-  description = "Map of rancher token-minting roles to create"
-  type = map(object({
-    name            = string
-    backend         = string
-    service_account = string
-    cluster_name    = optional(string)
-    description     = optional(string)
-    ttl             = optional(number)
-    max_ttl         = optional(number)
-  }))
-  default = {}
-}
-
 variable "policy_auth_map" {
   description = "Map of auth mounts -> auth roles -> policy names"
   type        = map(map(list(string)))

policies/rancher/admin.yaml

@@ -0,0 +1,55 @@
+# Allow the vault deployer to import the rancher plugin and manage its engine
+# (config, seeded service accounts, and roles).
+#
+# terraform-vault registers the plugin itself (vault_plugin -> sys/plugins/catalog,
+# a sudo-protected path) and manages the engine via the ranchervaultsecret
+# provider, so the deployer needs catalog access on top of the mount access it
+# already has (sys/mounts/*). Without this, apply 403s on the plugin
+# registration and on rancher/{config,service-accounts,roles} writes.
+---
+rules:
+  # Import / register (and deregister) the rancher plugin in the catalog.
+  - path: "sys/plugins/catalog/secret/vault-plugin-secrets-rancher"
+    capabilities:
+      - create
+      - read
+      - update
+      - delete
+      - sudo
+  # Engine connection config.
+  - path: "rancher/config"
+    capabilities:
+      - create
+      - read
+      - update
+      - delete
+  # Seeded, auto-rotated service-account tokens (+ manual rotate).
+  - path: "rancher/service-accounts/*"
+    capabilities:
+      - create
+      - read
+      - update
+      - delete
+      - list
+  - path: "rancher/service-accounts"
+    capabilities:
+      - read
+      - list
+  # Token-minting roles.
+  - path: "rancher/roles/*"
+    capabilities:
+      - create
+      - read
+      - update
+      - delete
+      - list
+  - path: "rancher/roles"
+    capabilities:
+      - read
+      - list
+
+auth:
+  approle:
+    - tf_vault
+  k8s/au/syd1:
+    - woodpecker_terraform_vault