Add device data model and ITAM service

Introduce device, posture, and enrollment-token entities with ITAM
service policies for agent-managed fleet inventory.

Signed-off-by: Ludovic Vielle <ludovic@probo.com>

pkg/itam/policies.go

@@ -0,0 +1,78 @@
+// Copyright (c) 2025-2026 Probo Inc <hello@probo.com>.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package itam
+
+import (
+	"go.probo.inc/probo/pkg/iam"
+	"go.probo.inc/probo/pkg/iam/policy"
+)
+
+var (
+	organizationCondition = policy.Equals("principal.organization_id", "resource.organization_id")
+	ownerCondition        = policy.Equals("principal.id", "resource.owner_id")
+)
+
+// FullAccessPolicy grants complete ITAM access to organization owners and
+// admins.
+var FullAccessPolicy = policy.NewPolicy(
+	"itam:full-access",
+	"ITAM Full Access",
+	policy.Allow(
+		ActionDeviceList, ActionEmployeeDeviceList, ActionDeviceGet, ActionDeviceCreate,
+		ActionDeviceEnroll, ActionDeviceRevoke, ActionDeviceAssignOwner,
+		ActionDevicePostureList,
+	).WithSID("itam-full-access").When(organizationCondition),
+).WithDescription("Full ITAM access for organization owners and admins")
+
+// ViewerPolicy grants read-only access to ITAM entities for organization
+// viewers.
+var ViewerPolicy = policy.NewPolicy(
+	"itam:viewer",
+	"ITAM Viewer",
+	policy.Allow(
+		ActionDeviceGet, ActionDeviceList,
+		ActionDevicePostureList,
+	).WithSID("itam-read-access").When(organizationCondition),
+).WithDescription("Read-only ITAM access for organization viewers")
+
+// EmployeePolicy grants self-enrollment access to organization employees.
+var EmployeePolicy = policy.NewPolicy(
+	"itam:employee",
+	"ITAM Employee",
+	policy.Allow(ActionDeviceEnroll).
+		WithSID("itam-employee-enroll-device").
+		When(organizationCondition),
+	policy.Allow(ActionDeviceGet).
+		WithSID("itam-employee-get-own-device").
+		When(organizationCondition, ownerCondition),
+	policy.Allow(ActionEmployeeDeviceList).
+		WithSID("itam-employee-device-list").
+		When(organizationCondition),
+).WithDescription("Self-enrollment: enroll own device and read own enrolled devices")
+
+// ITAMPolicySet returns the PolicySet for the ITAM service.
+func ITAMPolicySet() *iam.PolicySet {
+	return iam.NewPolicySet().
+		AddRolePolicy("OWNER", FullAccessPolicy).
+		AddRolePolicy("ADMIN", FullAccessPolicy).
+		AddRolePolicy("VIEWER", ViewerPolicy).
+		AddRolePolicy("EMPLOYEE", EmployeePolicy)
+}