Resolve a trusted user and tenant context after authentication, then enforce it at every boundary: template lookup, database query, storage-key construction, and asset delivery. Tenant-specific directories and object prefixes help organize data, but they do not authorize access. A request must still be denied whenever the authenticated context does not own the requested template, row, or file.
What tenant isolation must protect
“Per user” and “per tenant” are related but different scopes. A tenant may represent an organization with many users; one user may own private uploads inside that organization, while shared tenant assets are available to its members. Decide which scope applies to each resource, and make it explicit in the data model and authorization rules.
Isolation is not a directory naming convention. It is a chain of decisions: identify the caller from trusted server-side state, resolve the tenant, constrain each lookup to that context, and authorize access before rendering or serving anything. A path such as tenants/acme/logo.png is useful for organization, but knowing or guessing that path must not grant access.
- Templates: a tenant may override selected templates while inheriting common templates, if that behavior is intentional.
- Static assets: application files such as shared CSS, logos, or compiled JavaScript are often public and versioned separately from user content.
- User media: uploads, documents, and generated files may contain private information and need ownership checks and a private delivery path.
These categories can use different policies. Do not let a convenient shared storage location silently give user uploads the same public access as static build output.
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Choose an isolation model
Django-tenants documentation describes three common multitenancy approaches: separate databases, separate schemas in one database, and a shared schema with tenant keys. Its implementation uses schema-per-tenant. The right choice depends on the boundary you need and the operational burden you can support.
| Model | Isolation and failure impact | Operational trade-offs | Best fit |
|---|---|---|---|
| Separate database per tenant | Strongest of these operational boundaries; a tenant’s database can be handled independently. | More provisioning and migration work, and potentially greater connection and resource use. Tenant-level backup and restore are simpler to scope. | Use when contractual, regulatory, recovery, or threat-model needs justify the overhead. |
| Separate schema per tenant | Namespace separation inside one database; a mistaken schema selection can still have broad impact. | One database to operate, but schema-aware migrations and tenant context are required. Django-tenants describes this as its compromise between simplicity and performance. | Use when namespace separation is valuable without managing a separate database for every tenant. |
| Shared schema with tenant keys | Isolation depends on every access path enforcing the tenant key; a missed filter can expose another tenant’s records. | Often easiest to operate at scale, but query, uniqueness, background-job, cache, and storage logic all need tenant scope. | Use when operational simplicity is important and you can enforce tenant scope systematically, with additional safeguards. |
There is no universally safest choice independent of operating context. Compare migration complexity, connection and resource use, backup/restore scope, noisy-neighbor behavior, and the effect of a mistaken query alongside isolation strength. A database or schema boundary can reduce some classes of accidental mixing; neither replaces authorization in application code.
Resolve identity before looking up anything
Authenticate first. Derive the user and tenant from a server-controlled session or verified JWT claims, or map a trusted host name to a tenant on the server. Do not accept a client-supplied tenant ID as authoritative just because it appears in a URL, form, header, or object key.
- Verify the session or token and obtain the authenticated user identifier.
- Resolve the tenant from trusted membership data or a server-maintained host-to-tenant mapping.
- Check that the user is allowed to act in that tenant; a valid user identity alone does not establish membership.
- Build a request context containing the user and tenant IDs, and pass it to database, template, job, and storage operations.
For host-based routing, validate the host against the application’s tenant mapping after the request reaches trusted infrastructure. Do not infer tenant identity from an arbitrary forwarded-host value unless a trusted proxy has normalized and validated it. Treat a missing, unknown, or mismatched tenant as an error; do not fall back to a default tenant’s private data.
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Scope every database read and write
In a shared-schema design, every tenant-owned record needs a tenant key. Queries should constrain both the object ID and the resolved tenant; an unscoped lookup by an object ID is not enough. Apply the same rule to updates, deletes, uniqueness constraints, exports, admin actions, and background tasks.
# Illustrative Django-style pattern; adapt model and membership names to your app.
def get_asset_for_request(request, asset_id):
context = request.tenant_context # set only by trusted authentication/middleware
return Asset.objects.get(
id=asset_id,
tenant_id=context.tenant_id,
owner_id=request.user.id,
)The owner condition is appropriate for user-private assets; for tenant-shared assets, enforce tenant membership and the resource’s sharing policy instead. Return a denial or not-found response according to the application’s disclosure policy. Do not perform an unrestricted lookup first and rely on the client interface to hide unauthorized results.
Carry the tenant context into uniqueness rules as well. For example, if a tenant may have its own template named invoice.html, uniqueness should be defined within that tenant’s scope rather than globally, unless global naming is intended. Database row-level policies can add defense in depth where available, but they do not eliminate the need to set and validate request context reliably.
Background jobs deserve their own explicit context. Put the tenant identifier and resource identifier in the job payload, validate that the resource belongs to that tenant when the job runs, and avoid relying on whichever tenant happened to be active in the process when the job was queued.
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Load tenant templates with a controlled fallback
A useful template arrangement is tenant-first lookup followed by shared templates. Django-tenants’ tenant-aware file-handling guide describes a loader that searches tenant-specific templates first and then reverts to the standard search path. That gives a tenant an override without requiring a full copy of every shared template.
Keep the lookup roots server-controlled. Resolve the tenant before rendering, and derive its template directory from the trusted tenant record rather than a query parameter or a raw path supplied by the caller. Validate that tenant-specific templates cannot escape their configured root through path traversal or unsafe dynamic include paths. If users can submit template content, treat that as executable presentation logic and apply an explicit review and sandboxing design rather than treating it like an ordinary upload.
Decide which templates are overrideable. Shared security-sensitive layouts, account flows, or administrative screens may need tighter control than cosmetic tenant-branded pages. Test missing-override behavior as well as successful overrides: when a tenant template is absent, the shared fallback should render; when tenant context is absent or invalid, private tenant-specific templates should not be selected accidentally.
Keep static files separate from user media
Django-tenants’ file-handling guide describes tenant-aware finders, storage handlers, template loaders, and tenant-relative paths. Its documented default behavior creates a tenant subdirectory in STATIC_ROOT for static files and in MEDIA_ROOT for media. Those locations make collection and organization tenant-aware, but a subdirectory alone is not an access-control policy.
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Build and deploy static files separately from user uploads wherever practical. Static output is often intended for public delivery; media may need per-user or per-tenant authorization. Cookiecutter Django documents a bucket arrangement with a publicly readable static/ prefix and a media/ prefix for uploads, and warns that a container-wide public setting can expose both when they share a container. If the storage provider cannot reliably apply distinct policies, use separate containers or buckets.
- Public static content: serve only files intended for anyone to fetch, and ensure uploads cannot be written into that namespace.
- Private media: keep the origin private and authorize each download, for example through short-lived signed URLs or a CDN that authenticates to a private origin.
- Mixed containers: verify the effective policy for both prefixes; a public bucket or container setting can override the intent implied by folder names.
Cookiecutter Django’s guidance describes retaining signed-query authentication for private media, or using CloudFront Origin Access Control and equivalent private-origin patterns for other providers. Choose the mechanism your provider supports, then test the actual anonymous and authenticated delivery paths rather than assuming the object’s prefix determines visibility.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Construct storage keys, then authorize independently
Use immutable identifiers in keys so user-controlled filenames cannot collide with another tenant’s files or influence the storage path. A suitable shape is:
tenants/{tenant_id}/users/{user_id}/assets/{asset_id}Generate this key on the server after resolving the request context. Store the original filename as metadata if needed for display; do not use it as proof of identity or authorization. Before reading, deleting, replacing, or issuing a download URL, look up the asset record under the authenticated tenant and user scope, verify the requested action is allowed, and use the server-stored key.
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AWS’s sample repository describes tagging objects per tenant and user and using an access point per tenant. Oracle’s security guidance describes policies based on bucket and object-name patterns, with conditions that restrict access to a specific user. These storage-layer controls can complement application authorization, short-lived credentials, and immutable object IDs. They are not a reason to trust a client-supplied prefix: identity still has to be resolved by the application before a storage operation is authorized.
Record security-relevant decisions with the user, tenant, object ID, action, and allow/deny result. Avoid putting sensitive personal data in object names, which may appear in logs, URLs, or operational tooling.
Test cross-tenant denial as a first-class behavior
Positive tests prove that an owner can use an asset; isolation also needs negative tests that deliberately alter one input at a time. The following are engineering checks, not reported test results from the cited documentation.
- Change the requested user ID while keeping the authenticated session fixed.
- Change the tenant host or tenant selector without changing authenticated membership.
- Substitute another tenant’s database object ID, template path, or storage key.
- Reuse or alter a download token, including after it expires or the user loses access.
- Run a background job with a mismatched tenant and resource identifier.
- Attempt anonymous access to media and check the origin as well as the normal CDN path.
Each independent change should be denied unless a documented sharing rule permits it. Include cache behavior in these tests: a correctly authorized response cached under a key that omits tenant or user context can still be delivered to the wrong caller. Tenant-sensitive cache keys must include the relevant scope, or the response must not be shared.
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This is an optional screenshot service, separate from tenant authorization. If you need to capture a public page while checking how a page or asset appears in a browser, one GET request can return an image or PDF. See the ScreenshotNeo API documentation for parameters.
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo removes cookie and consent banners, newsletter popups, and chat widgets before capture; each cleanup step can be turned off. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed, and the response identifies the page verdict and billing status in headers. Its MCP server provides screenshot and page-information tools for AI agents. The free plan includes 1,000 screenshots a month without a card; paid plans start at $5 for 3,000 screenshots. See ScreenshotNeo for service details. Do not send credentials or private tenant URLs to a screenshot service unless your security review explicitly permits it. Sign up for 1,000 free screenshots a month, with no card required.
Troubleshoot common isolation failures
| Symptom | Likely cause | What to check or change |
|---|---|---|
| A user sees another tenant’s row or file | An ID-only lookup, missing tenant filter, or trust in a client-provided tenant value. | Trace the request from identity resolution to the final query or storage operation. Scope the lookup to server-resolved tenant and ownership, and add a negative test for that access path. |
| A tenant override is ignored | Tenant context is not established before template lookup, or the configured loader/finder search order does not place the tenant path first. | Inspect the resolved tenant and configured search roots, then verify the missing-template fallback separately. |
| An uploaded file is publicly reachable | The upload shares a public container policy with static assets, or the CDN/origin permits anonymous reads. | Check effective container and object policies, not just the prefix. Move private media to a separate private container or apply an authenticated private-origin design. |
| A background task uses the wrong tenant | The job relies on ambient process state or accepts a resource key without checking its tenant. | Include tenant context in the job payload and verify resource ownership again when the job executes. |
| Private content appears through a cache | The cache key or shared-cache policy omits the tenant/user scope. | Include the authorization scope in the cache key or disable shared caching for that response; test with two accounts and tenants. |
Operational checklist
- Resolve identity and tenant context from trusted server-side sources before data or template access.
- Make tenant scope explicit in database queries, jobs, cache keys, storage operations, and audit records.
- Keep static build output and private user media under policies that match their different audiences.
- Use directory prefixes and object tags for organization and defense in depth, never as sole authorization.
- Test denial after independently changing user, tenant, path, key, host, and token inputs.
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