* Fix SQL injection in suggestions column configuration
The suggestions_first_column, suggestions_second_column, and
suggestions_third_column configuration values were concatenated
directly into SQL SELECT statements without validation, allowing
SQL injection attacks through the item search suggestions.
Changes:
- Add whitelist validation in Config controller to only allow
valid column names (name, item_number, description, cost_price,
unit_price)
- Add defensive validation in Item model's get_search_suggestion_format()
and get_search_suggestion_label() methods
- Default invalid values to 'name' column for safety
- Add unit tests to verify malicious inputs are rejected
This is a critical security fix as attackers with config permissions
could inject arbitrary SQL through these configuration fields.
Vulnerability reported as additional injection point in bug report.
* Refactor: Move allowed suggestions columns to Item model constants
Extract the list of valid suggestion columns into two constants in the Item model for better cohesion:
- ALLOWED_SUGGESTIONS_COLUMNS: valid column names
- ALLOWED_SUGGESTIONS_COLUMNS_WITH_EMPTY: includes empty string for config validation
This consolidates the validation logic in one place and makes it reusable across Config controller and Item model.
* Address PR review comments: improve validation and code quality
Changes:
- Use camelCase naming for validateSuggestionsColumn() method (PSR-12)
- Add field-aware validation with different fallbacks for first vs other columns
- Handle non-string POST input by checking is_string() before validation
- Refactor duplicate validation logic into suggestionColumnIsAllowed() helper
- Use consistent camelCase variable names ($suggestionsFirstColumn)
- Update tests to validate constants and behavior rather than implementation
- Tests now focus on security properties of the allowlist itself
The validation now properly handles:
- First column: defaults to 'name' when invalid
- Second/Third columns: defaults to '' (empty) when invalid
- Non-string inputs: treated as invalid with appropriate fallback
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Co-authored-by: Ollama <ollama@steganos.dev>
