Authorization

Authorization in Strøm is optional and config-driven. When no acl section is present in server-config.yaml, all authenticated users have full access (backward compatible). Adding the acl section enables fine-grained access control.

Core concepts

Admin users bypass all ACL rules and always have full access. They can manage other users, toggle admin status, and assign groups.

Groups are named sets of users (e.g., devops, engineering, qa). Groups are stored in the database and managed via the UI or API. You reference them in ACL rules without pre-creating them.

ACL rules define what users/groups can do with which workspaces and tasks. Each rule specifies an action: run (full access), view (read-only), or deny (invisible).

Server configuration

acl:
  default: deny    # What happens when no rule matches: deny | view | run
  rules:
    - workspace: "production"
      tasks: ["deploy/*"]
      action: run
      groups: [devops]
      users: [contractor@ext.com]
    - workspace: "*"
      tasks: ["*"]
      action: view
      groups: [engineering]

Fields

Field	Description
default	Default action when no rule matches: deny, view, or run. Defaults to deny.
rules	List of ACL rules (each with workspace, tasks, action, groups, users)
workspace	Exact workspace name or * (all workspaces). Supports * wildcard.
tasks	List of task patterns. Task path is "{folder}/{task_name}" when a folder is set, or just "{task_name}". Supports * wildcard (e.g., ["deploy/*", "rollback"]).
action	run (full access), view (read-only), or deny (invisible).
groups	List of group names to match (OR’d with users).
users	List of user email addresses to match (OR’d with groups).

Evaluation logic

1. If user is admin → always Run (full access)
2. If no ACL is configured → always Run (backward compatible)
3. Check all matching rules (workspace + tasks match) → highest permission wins (Run > View > Deny)
   • Order of rules in config doesn’t matter
   • If a rule matches workspace and task patterns, check if user/groups match
4. If no rules matched → use acl.default (defaults to deny)

Permission levels

Permission	See in list	Execute/cancel	View logs
Run	✓	✓	✓
View	✓	✗	✓
Deny	✗	✗	✗

Admin users

The initial user (from auth.initial_user in config) is automatically promoted to admin on startup.

When OIDC SSO is enabled, the first user to sign in becomes admin if no users exist yet.

Admins can:

• View and manage all users and groups (Users page)
• View and manage workers (Workers page)
• Toggle admin status on other users
• Create, update, and delete user groups

Toggling admin status

Via the UI:

1. Navigate to Users page (admin only)
2. Click on a user
3. Toggle the Administrator switch

Via the API:

curl -X PUT https://stroem.example.com/api/users/{id}/admin \
  -H "Authorization: Bearer <jwt-token>" \
  -H "Content-Type: application/json" \
  -d '{"is_admin": true}'

Managing groups

Groups are named sets of users. Create them by assigning them to users — they’re materialized on first use.

Via the UI

1. Navigate to Users page (admin only)
2. Click on a user
3. In the Administration card, find the Groups section
4. Type a group name and click “Add” (existing groups auto-suggest)
5. Click the X next to a group to remove it
6. Changes are saved immediately

Via the API

# Get a user's groups
curl https://stroem.example.com/api/users/{id}/groups \
  -H "Authorization: Bearer <jwt-token>"

# Set a user's groups
curl -X PUT https://stroem.example.com/api/users/{id}/groups \
  -H "Authorization: Bearer <jwt-token>" \
  -H "Content-Type: application/json" \
  -d '{"groups": ["devops", "engineering"]}'

# List all distinct group names
curl https://stroem.example.com/api/groups \
  -H "Authorization: Bearer <jwt-token>"

Group names must be 1-64 characters, alphanumeric with underscores and hyphens.

Examples

Team-based access

acl:
  default: deny
  rules:
    # DevOps team can run everything everywhere
    - workspace: "*"
      tasks: ["*"]
      action: run
      groups: [devops]
    # Backend team can run tasks in staging, view production
    - workspace: "staging"
      tasks: ["*"]
      action: run
      groups: [backend]
    - workspace: "production"
      tasks: ["*"]
      action: view
      groups: [backend]
    # QA can run test tasks anywhere
    - workspace: "*"
      tasks: ["test/*", "qa/*"]
      action: run
      groups: [qa]

Folder-based task access

acl:
  default: deny
  rules:
    # Contractors can only run specific tasks
    - workspace: "production"
      tasks: ["reports/daily-summary", "reports/weekly-digest"]
      action: run
      users: [contractor@ext.com]
    # Everyone else gets view-only
    - workspace: "*"
      tasks: ["*"]
      action: view
      groups: [employees]

Environment-based access

acl:
  default: deny
  rules:
    # Developers have full access to dev workspace
    - workspace: "dev"
      tasks: ["*"]
      action: run
      groups: [developers]
    # Staging is open for experimentation
    - workspace: "staging"
      tasks: ["*"]
      action: run
      groups: [developers, qa]
    # Production is tightly controlled
    - workspace: "production"
      tasks: ["deploy/*"]
      action: run
      groups: [devops]
    - workspace: "production"
      tasks: ["*"]
      action: view
      groups: [developers, qa]

Token expiration behavior

When you revoke a user’s admin status or change their group assignments, those changes take effect immediately for new requests.

However, existing JWT access tokens (15-minute TTL) remain valid until they expire. If you need to revoke access immediately, the user’s token will still work for up to 15 minutes.

API keys reflect changes immediately — they are validated against the database on each request.

Helm deployment

Use the acl section in the server config:

server:
  config:
    acl:
      default: deny
      rules:
        - workspace: "*"
          tasks: ["*"]
          action: run
          groups: [admin-team]
        - workspace: "*"
          tasks: ["*"]
          action: view
          groups: [engineering]

If using Helm secrets, remember that the ACL config is baked into the ConfigMap (it’s not secret). Group assignments are stored in the database and managed via API.

Known limitations

• Webhooks (/hooks/{name}) use their own secret-based authentication, not user ACL. They are not subject to ACL rules.
• JWT token TTL: After revoking admin status or changing groups, existing tokens remain valid for up to 15 minutes (the access token TTL). This is by design to avoid excessive database queries on each request.

API reference

Endpoint	Method	Description	Auth
/api/users	GET	List all users	JWT (admin)
/api/users/{id}	GET	Get user detail	JWT (admin)
/api/users/{id}/admin	PUT	Set admin flag	JWT (admin)
/api/users/{id}/groups	GET	Get user’s groups	JWT (admin)
/api/users/{id}/groups	PUT	Set user’s groups	JWT (admin)
/api/groups	GET	List all group names	JWT (admin)

See Auth API for full endpoint details.