diff --git a/pkg/rules/engine.go b/pkg/rules/engine.go
index c37c735..79b91e7 100644
--- a/pkg/rules/engine.go
+++ b/pkg/rules/engine.go
@@ -34,6 +34,11 @@ type Query struct {
 	SourceASN       uint32
 }
 
+// match checks if any of the conditions match the given matchFunc.
+func match[T any](conditions []T, matchFunc func(T) bool) bool {
+	return len(conditions) == 0 || utils.Any(conditions, matchFunc)
+}
+
 // ruleApplies checks if the given query is allowed or denied by the given
 // rule. For a rule to be applicable, the query must match all of the rule's
 // conditions.
@@ -43,47 +48,30 @@ type Query struct {
 //
 // Domains, methods and countries are case-insensitive.
 func ruleApplies(rule *schema.AccessControlRule, query *Query) bool {
-	if len(rule.Domains) > 0 {
-		if utils.None(rule.Domains, func(domain string) bool {
-			return glob.Star(domain, query.RequestedDomain)
-		}) {
-			return false
-		}
-	}
+	matchDomain := match(rule.Domains, func(domain string) bool {
+		return glob.Star(
+			strings.ToLower(domain),
+			strings.ToLower(query.RequestedDomain),
+		)
+	})
 
-	if len(rule.Methods) > 0 {
-		if utils.None(rule.Methods, func(method string) bool {
-			return strings.EqualFold(method, query.RequestedMethod)
-		}) {
-			return false
-		}
-	}
+	matchMethod := match(rule.Methods, func(method string) bool {
+		return strings.EqualFold(method, query.RequestedMethod)
+	})
 
-	if len(rule.Networks) > 0 {
-		if utils.None(rule.Networks, func(network schema.CIDR) bool {
-			return network.Contains(query.SourceIP)
-		}) {
-			return false
-		}
-	}
+	matchIP := match(rule.Networks, func(network schema.CIDR) bool {
+		return network.Contains(query.SourceIP)
+	})
 
-	if len(rule.Countries) > 0 {
-		if utils.None(rule.Countries, func(country string) bool {
-			return strings.EqualFold(country, query.SourceCountry)
-		}) {
-			return false
-		}
-	}
+	matchCountry := match(rule.Countries, func(country string) bool {
+		return strings.EqualFold(country, query.SourceCountry)
+	})
 
-	if len(rule.AutonomousSystems) > 0 {
-		if utils.None(rule.AutonomousSystems, func(asn uint32) bool {
-			return asn == query.SourceASN
-		}) {
-			return false
-		}
-	}
+	matchANS := match(rule.AutonomousSystems, func(asn uint32) bool {
+		return asn == query.SourceASN
+	})
 
-	return true
+	return matchDomain && matchMethod && matchIP && matchCountry && matchANS
 }
 
 // UpdateConfig updates the engine's configuration with the given access
diff --git a/pkg/rules/engine_test.go b/pkg/rules/engine_test.go
index 557df73..d8a6d89 100644
--- a/pkg/rules/engine_test.go
+++ b/pkg/rules/engine_test.go
@@ -117,6 +117,22 @@ func TestEngineAuthorize(t *testing.T) {
 			},
 			want: false,
 		},
+		{
+			name: "domains are case-insensitive",
+			config: &schema.AccessControl{
+				Rules: []schema.AccessControlRule{
+					{
+						Domains: []string{"example.org", "example.com"},
+						Policy:  schema.PolicyAllow,
+					},
+				},
+				DefaultPolicy: schema.PolicyDeny,
+			},
+			query: &rules.Query{
+				RequestedDomain: "EXAMPLE.ORG",
+			},
+			want: true,
+		},
 		{
 			name: "allow by method",
 			config: &schema.AccessControl{
@@ -165,6 +181,22 @@ func TestEngineAuthorize(t *testing.T) {
 			},
 			want: false,
 		},
+		{
+			name: "methods are case-insensitive",
+			config: &schema.AccessControl{
+				Rules: []schema.AccessControlRule{
+					{
+						Methods: []string{"GET", "POST"},
+						Policy:  schema.PolicyAllow,
+					},
+				},
+				DefaultPolicy: schema.PolicyDeny,
+			},
+			query: &rules.Query{
+				RequestedMethod: "get",
+			},
+			want: true,
+		},
 		{
 			name: "allow by network",
 			config: &schema.AccessControl{
@@ -263,6 +295,22 @@ func TestEngineAuthorize(t *testing.T) {
 			},
 			want: false,
 		},
+		{
+			name: "countries are case-insensitive",
+			config: &schema.AccessControl{
+				Rules: []schema.AccessControlRule{
+					{
+						Countries: []string{"FR", "US"},
+						Policy:    schema.PolicyAllow,
+					},
+				},
+				DefaultPolicy: schema.PolicyDeny,
+			},
+			query: &rules.Query{
+				SourceCountry: "fr",
+			},
+			want: true,
+		},
 		{
 			name: "allow by ASN",
 			config: &schema.AccessControl{
diff --git a/pkg/utils/glob/glob_test.go b/pkg/utils/glob/glob_test.go
index 0248a80..577c37c 100644
--- a/pkg/utils/glob/glob_test.go
+++ b/pkg/utils/glob/glob_test.go
@@ -14,6 +14,7 @@ func TestStar(t *testing.T) {
 	}{
 		{"", "", true},
 		{"*", "", true},
+		{"a", "", false},
 		{"", "abc", false},
 		{"*", "abc", true},
 		{"a*", "abc", true},