bcquality/custom/knowledge/architecture/permission-sets-must-follow-least-privilege.md
Michael Dieringer 288f64df16 Add BCApps citations to Tier 1+2 knowledge files; add 2 new rules
- All 7 existing Tier 1/2 knowledge files now include a BCApps Reference
  section with concrete source links and observed patterns
- New: bcpt-scenarios-must-be-app-specific — PerformanceTest apps must
  include app-domain BCPT scenarios, not only Microsoft generic samples
- New: permission-sets-must-follow-least-privilege — View/Edit/Admin
  hierarchy with IncludedPermissionSets, mirroring BCApps BusFound pattern
- api-page-key-fields-must-be-editable-on-insert clarified: SystemId as
  ODataKeyField + Editable=false is valid (auto-generated); rule applies
  to consumer-provided key fields only

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-23 17:48:37 +02:00

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# CURABIS Architecture: Permission Sets Must Follow Least-Privilege Hierarchy
## Core Rule
Permission sets in CURABIS apps must be structured in access tiers following the least-privilege principle. Tiers must be **additive** — each tier includes the one below it via `IncludedPermissionSets`. No single permission set should bundle user-level and administrative access in a flat structure.
## Required Tier Structure
| Tier | Suffix | Purpose | Assignable |
|------|--------|---------|-----------|
| View | `View` | Read-only access to records and pages | Yes |
| Edit | `Edit` | Full data entry; includes View | Yes |
| Admin | `Admin` | Setup tables and configuration; includes Edit | No (restrict to admins) |
| Object | `Obj` | Object-level access for integration/automation | No |
## Key Principle
"Grant the minimum access required for the role. An end user who enters data needs Edit, not Admin. An integration service needs Obj, not a named user set."
## Implementation Pattern
```al
permissionset 50100 "PM365 - View"
{
Access = Public;
Assignable = true;
Caption = 'Project Mgmt 365 - View';
Permissions =
tabledata "PM Project" = R,
tabledata "PM Project Task" = R,
page "PM Project List" = X,
page "PM Project Card" = X;
}
permissionset 50101 "PM365 - Edit"
{
Access = Public;
Assignable = true;
Caption = 'Project Mgmt 365 - Edit';
IncludedPermissionSets = "PM365 - View";
Permissions =
tabledata "PM Project" = RIMD,
tabledata "PM Project Task" = RIMD,
codeunit "PM Project Management" = X;
}
permissionset 50102 "PM365 - Admin"
{
Access = Public;
Assignable = false;
Caption = 'Project Mgmt 365 - Admin';
IncludedPermissionSets = "PM365 - Edit";
Permissions =
tabledata "PM Setup" = RIMD,
page "PM Setup" = X;
}
```
## Relationship to CURABIS-ARCH-011
This rule is a **companion to CURABIS-ARCH-011** (`exposed-objects-must-be-in-a-permission-set`):
- **CURABIS-ARCH-011**: Every exposed object *must exist* in at least one permission set
- **This rule**: Permission sets *themselves* must follow the hierarchical least-privilege structure
Both must be satisfied simultaneously: it is not enough that objects appear in a permission set if that set grants excessive access.
## Anti-Pattern
```al
// Violation: flat "full access" set bundles user and admin access
permissionset 50100 "PM365 - Full Access"
{
Assignable = true;
Permissions =
tabledata "PM Project" = RIMD,
tabledata "PM Setup" = RIMD, // admin data mixed with user data
tabledata "PM Project Task" = RIMD,
codeunit "PM Post Codeunit" = X;
}
```
## BCApps Reference
BCApps Business Foundation defines exactly this tiered pattern:
```al
// BusFoundEdit.PermissionSet.al
permissionset 4 "Bus. Found. - Edit"
{
Access = Public;
Assignable = true;
Caption = 'Business Foundation - Edit';
IncludedPermissionSets = "Bus. Found. - View";
}
```
Microsoft uses Admin, Edit, View, Obj, and Read tiers with `IncludedPermissionSets` throughout BCApps — never a single flat "full access" set.
- **Source:** https://github.com/microsoft/BCApps/tree/main/src/Business%20Foundation/App/Permissions
- **Files:** `BusFoundAdmin`, `BusFoundEdit`, `BusFoundView`, `BusFoundObj`, `BusFoundRead`
- **Pattern:** Each tier inherits from the tier below via `IncludedPermissionSets`. Admin sets use `Assignable = false` to prevent accidental assignment to regular users.
## Verification
For each CURABIS app, confirm:
1. A `View` set exists for read-only roles
2. An `Edit` set exists and includes `View` via `IncludedPermissionSets`
3. An `Admin` set exists for setup objects, marked `Assignable = false`
4. No single flat set bundles both user-level and admin-level permissions