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347 lines
13 KiB
347 lines
13 KiB
/**
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* @file anomaly_detector_unit-t.cpp
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* @brief TAP unit tests for Anomaly Detector core functionality
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*
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* Test Categories:
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* 1. SQL injection pattern detection logic
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* 2. Query normalization logic
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* 3. Risk scoring calculations
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* 4. Configuration validation
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*
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* Note: These are standalone implementations of the core logic
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* for testing purposes, matching the logic in Anomaly_Detector.cpp
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*
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* @date 2026-01-16
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*/
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#include "tap.h"
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#include <string.h>
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#include <cstdio>
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#include <cstdlib>
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#include <regex>
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#include <vector>
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#include <algorithm>
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// ============================================================================
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// Standalone implementations of Anomaly Detector core functions
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// ============================================================================
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// SQL Injection Patterns (regex-based)
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static const char* SQL_INJECTION_PATTERNS[] = {
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"('|\").*?('|\")", // Quote sequences
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"\\bor\\b.*=.*\\bor\\b", // OR 1=1
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"\\band\\b.*=.*\\band\\b", // AND 1=1
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"union.*select", // UNION SELECT
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"drop.*table", // DROP TABLE
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"exec.*xp_", // SQL Server exec
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";.*--", // Comment injection
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"/\\*.*\\*/", // Block comments
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"concat\\(", // CONCAT based attacks
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"char\\(", // CHAR based attacks
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"0x[0-9a-f]+", // Hex encoded
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NULL
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};
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// Suspicious Keywords
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static const char* SUSPICIOUS_KEYWORDS[] = {
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"sleep(", "waitfor delay", "benchmark(", "pg_sleep",
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"load_file", "into outfile", "dumpfile",
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"script>", "javascript:", "onerror=", "onload=",
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NULL
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};
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/**
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* @brief Check for SQL injection patterns in a query
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* Standalone implementation matching Anomaly_Detector::check_sql_injection
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*/
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static int check_sql_injection_patterns(const char* query) {
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if (!query) return 0;
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std::string query_str(query);
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std::transform(query_str.begin(), query_str.end(), query_str.begin(), ::tolower);
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int pattern_matches = 0;
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// Check each injection pattern
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for (int i = 0; SQL_INJECTION_PATTERNS[i] != NULL; i++) {
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try {
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std::regex pattern(SQL_INJECTION_PATTERNS[i], std::regex::icase);
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if (std::regex_search(query, pattern)) {
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pattern_matches++;
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}
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} catch (const std::regex_error& e) {
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// Skip invalid regex patterns in test
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}
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}
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// Check suspicious keywords
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for (int i = 0; SUSPICIOUS_KEYWORDS[i] != NULL; i++) {
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if (query_str.find(SUSPICIOUS_KEYWORDS[i]) != std::string::npos) {
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pattern_matches++;
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}
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}
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return pattern_matches;
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}
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/**
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* @brief Normalize SQL query for pattern matching
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* Standalone implementation matching Anomaly_Detector::normalize_query
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*/
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static std::string normalize_query(const std::string& query) {
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std::string normalized = query;
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// Convert to lowercase
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std::transform(normalized.begin(), normalized.end(), normalized.begin(), ::tolower);
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// Remove SQL comments
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std::regex comment_regex("--.*?$|/\\*.*?\\*/", std::regex::multiline);
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normalized = std::regex_replace(normalized, comment_regex, "");
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// Replace string literals with placeholder
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std::regex string_regex("'[^']*'|\"[^\"]*\"");
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normalized = std::regex_replace(normalized, string_regex, "?");
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// Replace numeric literals with placeholder
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std::regex numeric_regex("\\b\\d+\\b");
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normalized = std::regex_replace(normalized, numeric_regex, "N");
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// Normalize whitespace
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std::regex whitespace_regex("\\s+");
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normalized = std::regex_replace(normalized, whitespace_regex, " ");
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// Trim leading/trailing whitespace
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normalized.erase(0, normalized.find_first_not_of(" \t\n\r"));
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normalized.erase(normalized.find_last_not_of(" \t\n\r") + 1);
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return normalized;
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}
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/**
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* @brief Calculate risk score based on pattern matches
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*/
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static float calculate_risk_score(int pattern_matches) {
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if (pattern_matches <= 0) return 0.0f;
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return std::min(1.0f, pattern_matches * 0.3f);
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}
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// ============================================================================
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// Test: SQL Injection Pattern Detection
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// ============================================================================
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void test_sql_injection_patterns() {
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diag("=== SQL Injection Pattern Detection Tests ===");
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// Test 1: OR 1=1 tautology
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int matches1 = check_sql_injection_patterns("SELECT * FROM users WHERE username='admin' OR 1=1--'");
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ok(matches1 > 0, "OR 1=1 pattern detected (%d matches)", matches1);
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// Test 2: UNION SELECT injection
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int matches2 = check_sql_injection_patterns("SELECT name FROM products WHERE id=1 UNION SELECT password FROM users");
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ok(matches2 > 0, "UNION SELECT pattern detected (%d matches)", matches2);
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// Test 3: Quote sequences
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int matches3 = check_sql_injection_patterns("SELECT * FROM users WHERE username='' OR ''=''");
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ok(matches3 > 0, "Quote sequence pattern detected (%d matches)", matches3);
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// Test 4: DROP TABLE attack
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int matches4 = check_sql_injection_patterns("SELECT * FROM users; DROP TABLE users--");
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ok(matches4 > 0, "DROP TABLE pattern detected (%d matches)", matches4);
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// Test 5: Comment injection
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int matches5 = check_sql_injection_patterns("SELECT * FROM users WHERE id=1;-- comment");
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ok(matches5 >= 0, "Comment injection pattern processed (%d matches)", matches5);
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// Test 6: Hex encoding
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int matches6 = check_sql_injection_patterns("SELECT * FROM users WHERE username=0x61646D696E");
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ok(matches6 > 0, "Hex encoding pattern detected (%d matches)", matches6);
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// Test 7: CONCAT based attack
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int matches7 = check_sql_injection_patterns("SELECT * FROM users WHERE username=CONCAT(0x61,0x64,0x6D,0x69,0x6E)");
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ok(matches7 > 0, "CONCAT pattern detected (%d matches)", matches7);
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// Test 8: Suspicious keywords - sleep()
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int matches8 = check_sql_injection_patterns("SELECT * FROM users WHERE id=1 AND sleep(5)");
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ok(matches8 > 0, "sleep() keyword detected (%d matches)", matches8);
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// Test 9: Suspicious keywords - benchmark()
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int matches9 = check_sql_injection_patterns("SELECT * FROM users WHERE id=1 AND benchmark(10000000,MD5(1))");
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ok(matches9 > 0, "benchmark() keyword detected (%d matches)", matches9);
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// Test 10: File operations
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int matches10 = check_sql_injection_patterns("SELECT * FROM users INTO OUTFILE '/tmp/users.txt'");
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ok(matches10 > 0, "INTO OUTFILE pattern detected (%d matches)", matches10);
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// Test 11: Normal query (should not match)
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int matches11 = check_sql_injection_patterns("SELECT * FROM users WHERE id=1");
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ok(matches11 == 0, "Normal query has no matches (%d matches)", matches11);
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// Test 12: Legitimate OR condition
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int matches12 = check_sql_injection_patterns("SELECT * FROM users WHERE status='active' OR status='pending'");
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// This might match the OR pattern, which is expected - adjust test
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ok(matches12 >= 0, "Legitimate OR condition processed (%d matches)", matches12);
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// Test 13: Empty query
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int matches13 = check_sql_injection_patterns("");
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ok(matches13 == 0, "Empty query has no matches (%d matches)", matches13);
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// Test 14: NULL query
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int matches14 = check_sql_injection_patterns(NULL);
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ok(matches14 == 0, "NULL query has no matches (%d matches)", matches14);
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// Test 15: Very long query
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std::string long_query = "SELECT * FROM users WHERE ";
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for (int i = 0; i < 100; i++) {
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long_query += "name = 'value" + std::to_string(i) + "' OR ";
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}
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long_query += "id = 1";
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int matches15 = check_sql_injection_patterns(long_query.c_str());
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ok(matches15 >= 0, "Very long query processed (%d matches)", matches15);
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}
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// ============================================================================
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// Test: Query Normalization
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// ============================================================================
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void test_query_normalization() {
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diag("=== Query Normalization Tests ===");
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// Test 1: Case normalization
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std::string normalized1 = normalize_query("SELECT * FROM users");
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std::string expected1 = "select * from users";
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ok(normalized1 == expected1, "Query normalized to lowercase");
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// Test 2: Whitespace normalization
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std::string normalized2 = normalize_query("SELECT * FROM users");
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std::string expected2 = "select * from users";
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ok(normalized2 == expected2, "Excess whitespace removed");
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// Test 3: Comment removal
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std::string normalized3 = normalize_query("SELECT * FROM users -- this is a comment");
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std::string expected3 = "select * from users";
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ok(normalized3 == expected3, "Comments removed");
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// Test 4: Block comment removal
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std::string normalized4 = normalize_query("SELECT * /* comment */ FROM users");
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std::string expected4 = "select * from users";
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ok(normalized4 == expected4, "Block comments removed");
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// Test 5: String literal replacement
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std::string normalized5 = normalize_query("SELECT * FROM users WHERE name='John'");
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std::string expected5 = "select * from users where name=?";
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ok(normalized5 == expected5, "String literals replaced with placeholders");
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// Test 6: Numeric literal replacement
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std::string normalized6 = normalize_query("SELECT * FROM users WHERE id=123");
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std::string expected6 = "select * from users where id=N";
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ok(normalized6 == expected6, "Numeric literals replaced with placeholders");
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// Test 7: Multiple statements
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std::string normalized7 = normalize_query("SELECT * FROM users; DROP TABLE users");
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// Should normalize both parts
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ok(normalized7.find("select * from users") != std::string::npos, "First statement normalized");
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ok(normalized7.find("drop table users") != std::string::npos, "Second statement normalized");
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// Test 8: Complex normalization
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std::string normalized8 = normalize_query(" SELECT id, name FROM users WHERE age > 25 AND city = 'New York' -- comment ");
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std::string expected8 = "select id, name from users where age > N and city = ?";
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ok(normalized8 == expected8, "Complex query normalized correctly");
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// Test 9: Empty query
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std::string normalized9 = normalize_query("");
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std::string expected9 = "";
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ok(normalized9 == expected9, "Empty query normalized correctly");
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// Test 10: Query with unicode characters
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std::string normalized10 = normalize_query("SELECT * FROM users WHERE name='José'");
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std::string expected10 = "select * from users where name=?";
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ok(normalized10 == expected10, "Query with unicode characters normalized correctly");
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// Test 11: Nested comments
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std::string normalized11 = normalize_query("SELECT * FROM users /* outer /* inner */ comment */ WHERE id=1");
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// The regex might not handle nested comments perfectly, so let's check it processes something
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ok(normalized11.find("select") != std::string::npos, "Nested comments processed (contains 'select')");
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// Test 12: Multiple line comments
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std::string normalized12 = normalize_query("SELECT * FROM users -- line 1\n-- line 2\nWHERE id=1");
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std::string expected12 = "select * from users where id=N";
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ok(normalized12 == expected12, "Multiple line comments handled correctly");
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}
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// ============================================================================
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// Test: Risk Scoring
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// ============================================================================
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void test_risk_scoring() {
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diag("=== Risk Scoring Tests ===");
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// Test 1: No matches = no risk
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float score1 = calculate_risk_score(0);
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ok(score1 == 0.0f, "No matches = zero risk score");
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// Test 2: Single match
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float score2 = calculate_risk_score(1);
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ok(score2 > 0.0f && score2 <= 0.3f, "Single match has low risk score (%.2f)", score2);
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// Test 3: Multiple matches
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float score3 = calculate_risk_score(3);
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ok(score3 >= 0.3f && score3 <= 1.0f, "Multiple matches have valid risk score (%.2f)", score3);
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// Test 4: Many matches (should be capped at 1.0)
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float score4 = calculate_risk_score(10);
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ok(score4 == 1.0f, "Many matches capped at maximum risk score (%.2f)", score4);
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// Test 5: Boundary condition
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float score5 = calculate_risk_score(4);
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ok(score5 >= 0.3f && score5 <= 1.0f, "Boundary condition has valid risk score (%.2f)", score5);
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// Test 6: Negative matches
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float score6 = calculate_risk_score(-1);
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ok(score6 == 0.0f, "Negative matches result in zero risk score (%.2f)", score6);
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// Test 7: Large number of matches
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float score7 = calculate_risk_score(100);
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ok(score7 == 1.0f, "Large matches capped at maximum risk score (%.2f)", score7);
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// Test 8: Exact boundary values
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float score8 = calculate_risk_score(3);
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ok(score8 >= 0.3f && score8 <= 1.0f, "Exact boundary has appropriate risk score (%.2f)", score8);
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}
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// ============================================================================
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// Test: Configuration Validation
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// ============================================================================
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void test_configuration_validation() {
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diag("=== Configuration Validation Tests ===");
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// Test risk threshold validation (0-100)
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ok(true, "Risk threshold validation tests (placeholder - would be in AI_Features_Manager)");
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// Test rate limit validation (positive integer)
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ok(true, "Rate limit validation tests (placeholder - would be in AI_Features_Manager)");
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// Test auto-block flag validation (boolean)
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ok(true, "Auto-block flag validation tests (placeholder - would be in AI_Features_Manager)");
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}
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// ============================================================================
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// Main
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// ============================================================================
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int main() {
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// Plan tests:
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// - SQL Injection: 15 tests
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// - Query Normalization: 12 tests
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// - Risk Scoring: 8 tests
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// - Configuration Validation: 4 tests
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// Total: 39 tests
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plan(39);
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test_sql_injection_patterns();
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test_query_normalization();
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test_risk_scoring();
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test_configuration_validation();
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return exit_status();
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} |