SAG / ARCHITECTURE NOTE
Collector SSRF Protection: Why Shouldn’t You Request Customer-Registered URLs As-Is?
These controls prevent user-provided addresses from directing requests to internal services or networks that are not allowed. Even an address that looks legitimate can reach an internal address after a redirect or name resolution. Opening network boundaries for analytical convenience undermines trust across the entire tenant.
What Is SSRF Protection?
These controls prevent user-provided addresses from directing requests to internal services or networks that are not allowed. This note frames SSRF protection in terms of the responsibilities of inputs, transformations, and outputs, rather than as a feature name. To trust an analysis result, it must be possible to trace what materials were received, what was checked, and how far the conclusions can extend.
Why Is This Technology Needed?
Even an address that looks legitimate can reach an internal address after a redirect or name resolution. Opening network boundaries for analytical convenience undermines trust across the entire tenant.
Design Principles and Data Flow
Check URL normalization, permitted protocols and hosts, redirect destinations, and internal-address blocking at each request stage. A single string check is not enough to consider the policy complete.
Registered URL → Network boundary validation → Permitted HTTP request
Each stage should not reframe the success of the preceding stage as an outcome of the next one. Keeping records of material identifiers, time periods, and validation status allows you to locate where omissions and errors occurred and determine what needs to be checked again.
Connection to the SAG Architecture
SAG domain registration and collection are configured around permitted sources. Maintaining the same network boundary when designing additional collection adapters is the extension guidance in this article.
SAG’s operational value lies in connecting this relationship to pages and questions, comparison results, and improvement tasks. Rather than reading numbers alone, customers can review both what needs to be strengthened and the basis for the assessment. Patterns that require additional application should be interpreted within the scope of the relevant paragraph.
Illustrative Example and Assessment Criteria
For illustration, if an external product address redirects to an internal management address, it should not be enough to pass the initial validation of the external address. The next destination must also be validated, or the request must be stopped.
The example above is provided to explain the structure and calculation; it is not a measured result from a specific customer. In an actual report, the selected period, target, observation conditions, and original records must be linked so that the same assessment can be verified again.
Practical Verification Checklist
| Flow stage | Item to check |
|---|---|
| Registered URL | Revalidate the destination at every redirect |
| Network boundary validation | Confirm that internal and loopback addresses are blocked |
| Permitted HTTP request | Set timeouts and response-size limits |
Check that the same meaning is maintained not only for valid input, but also for empty materials, duplicate materials, and materials with different conditions. Connecting verification items to completion criteria can reduce the gap between the feature description and actual operations.
Limitations and Points to Note When Applying
Blocking policies must be validated against the actual hosting network and DNS environment. This note provides protection design criteria; it does not mean that every environment is security-certified.
Research and Official Documentation
- OWASP SSRF Prevention Cheat Sheet — A resource for reviewing the trust boundaries of server requests created by user input.
External resources provide background on the design topic above; they do not certify every SAG implementation or customer result. The interpretation and illustrative examples in this note are organized according to SAG’s operational structure. Materials checked: 2026-10-06.
Further Reading and Feature Information
- Related architecture note
- Try the service connected to SSRF protection
- Feature-specific FAQ
- Discuss implementation scope
How to Continue Reading About This Technology
Follow HTML ZIP and sitemaps → normalization → page versions → evidence records.
SAG / KNOWLEDGE LINKS