feat(modules): add case-insensitive word matcher option (#319)

internal/modules/executor.go

@@ -383,7 +383,7 @@ func checkMatcher(m *Matcher, resp *http.Response, body string) bool {
 		return false
 
 	case "word":
-		return checkWords(getPart(m.Part, resp, body), m.Words, m.Condition)
+		return checkWords(getPart(m.Part, resp, body), m.Words, m.Condition, m.CaseInsensitive)
 
 	case "regex":
 		return checkRegex(getPart(m.Part, resp, body), m.Regex, m.Condition)
@@ -436,10 +436,19 @@ func getPart(part string, resp *http.Response, body string) string {
 }
 
 // checkWords checks if any/all words are found.
-func checkWords(content string, words []string, condition string) bool {
+func checkWords(content string, words []string, condition string, caseInsensitive bool) bool {
+	if caseInsensitive {
+		content = strings.ToLower(content)
+	}
+	fold := func(w string) string {
+		if caseInsensitive {
+			return strings.ToLower(w)
+		}
+		return w
+	}
 	if condition == "or" {
 		for _, word := range words {
-			if strings.Contains(content, word) {
+			if strings.Contains(content, fold(word)) {
 				return true
 			}
 		}
@@ -447,7 +456,7 @@ func checkWords(content string, words []string, condition string) bool {
 	}
 	// Default to AND
 	for _, word := range words {
-		if !strings.Contains(content, word) {
+		if !strings.Contains(content, fold(word)) {
 			return false
 		}
 	}

internal/modules/matchers_test.go

@@ -197,22 +197,27 @@ func TestCheckWords(t *testing.T) {
 	const content = "alpha beta gamma"
 
 	tests := []struct {
-		name      string
-		words     []string
-		condition string
-		expect    bool
+		name       string
+		content    string
+		words      []string
+		condition  string
+		caseInsens bool
+		expect     bool
 	}{
-		{name: "and all present", words: []string{"alpha", "gamma"}, condition: "and", expect: true},
-		{name: "and missing", words: []string{"alpha", "delta"}, condition: "and", expect: false},
-		{name: "or present", words: []string{"delta", "beta"}, condition: "or", expect: true},
-		{name: "or absent", words: []string{"delta", "epsilon"}, condition: "or", expect: false},
-		{name: "empty under and matches vacuously", words: nil, condition: "and", expect: true},
-		{name: "empty under or matches nothing", words: nil, condition: "or", expect: false},
+		{name: "and all present", content: content, words: []string{"alpha", "gamma"}, condition: "and", expect: true},
+		{name: "and missing", content: content, words: []string{"alpha", "delta"}, condition: "and", expect: false},
+		{name: "or present", content: content, words: []string{"delta", "beta"}, condition: "or", expect: true},
+		{name: "or absent", content: content, words: []string{"delta", "epsilon"}, condition: "or", expect: false},
+		{name: "empty under and matches vacuously", content: content, words: nil, condition: "and", expect: true},
+		{name: "empty under or matches nothing", content: content, words: nil, condition: "or", expect: false},
+		{name: "case mismatch fails by default", content: "AdMiN panel", words: []string{"admin"}, condition: "or", expect: false},
+		{name: "case-insensitive folds both sides", content: "AdMiN panel", words: []string{"admin"}, condition: "or", caseInsens: true, expect: true},
+		{name: "case-insensitive folds mixed needle", content: "admin panel", words: []string{"AdMiN"}, condition: "or", caseInsens: true, expect: true},
 	}
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if got := checkWords(content, tt.words, tt.condition); got != tt.expect {
+			if got := checkWords(tt.content, tt.words, tt.condition, tt.caseInsens); got != tt.expect {
 				t.Errorf("checkWords = %v, want %v", got, tt.expect)
 			}
 		})

internal/modules/module.go

@@ -95,6 +95,8 @@ type Matcher struct {
 	Hash      []int64  `yaml:"hash,omitempty"` // favicon: shodan mmh3 hashes (signed or unsigned)
 	Condition string   `yaml:"condition"`      // and, or
 	Negative  bool     `yaml:"negative"`
+	// CaseInsensitive folds word matching to lower-case when set (word matcher only).
+	CaseInsensitive bool `yaml:"case-insensitive,omitempty"`
 }
 
 // Extractor defines data extraction from responses.