Add ja3_fingerprint matching support to WAFv2

.changelog/33933.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/aws_wafv2_web_acl: Add `ja3_fingerprint` to `field_to_match` configuration blocks
+```

internal/service/wafv2/flex.go

@@ -525,6 +525,10 @@ func expandFieldToMatch(l []interface{}) *wafv2.FieldToMatch {
 		f.SingleHeader = expandSingleHeader(m["single_header"].([]interface{}))
 	}
 
+	if v, ok := m["ja3_fingerprint"]; ok && len(v.([]interface{})) > 0 {
+		f.JA3Fingerprint = expandJA3Fingerprint(v.([]interface{}))
+	}
+
 	if v, ok := m["single_query_argument"]; ok && len(v.([]interface{})) > 0 {
 		f.SingleQueryArgument = expandSingleQueryArgument(m["single_query_argument"].([]interface{}))
 	}
@@ -641,6 +645,20 @@ func expandBody(l []interface{}) *wafv2.Body {
 	return body
 }
 
+func expandJA3Fingerprint(l []interface{}) *wafv2.JA3Fingerprint {
+	if len(l) == 0 || l[0] == nil {
+		return nil
+	}
+
+	m := l[0].(map[string]interface{})
+
+	ja3fingerprint := &wafv2.JA3Fingerprint{
+		FallbackBehavior: aws.String(m["fallback_behavior"].(string)),
+	}
+
+	return ja3fingerprint
+}
+
 func expandJSONMatchPattern(l []interface{}) *wafv2.JsonMatchPattern {
 	if len(l) == 0 || l[0] == nil {
 		return nil
@@ -1901,6 +1919,10 @@ func flattenFieldToMatch(f *wafv2.FieldToMatch) interface{} {
 		m["headers"] = flattenHeaders(f.Headers)
 	}
 
+	if f.JA3Fingerprint != nil {
+		m["ja3_fingerprint"] = flattenJA3Fingerprint(f.JA3Fingerprint)
+	}
+
 	if f.JsonBody != nil {
 		m["json_body"] = flattenJSONBody(f.JsonBody)
 	}
@@ -1986,6 +2008,18 @@ func flattenCookiesMatchPattern(c *wafv2.CookieMatchPattern) interface{} {
 	return []interface{}{m}
 }
 
+func flattenJA3Fingerprint(j *wafv2.JA3Fingerprint) interface{} {
+	if j == nil {
+		return []interface{}{}
+	}
+
+	m := map[string]interface{}{
+		"fallback_behavior": aws.StringValue(j.FallbackBehavior),
+	}
+
+	return []interface{}{m}
+}
+
 func flattenJSONBody(b *wafv2.JsonBody) interface{} {
 	if b == nil {
 		return []interface{}{}

internal/service/wafv2/schemas.go

@@ -343,6 +343,7 @@ func fieldToMatchBaseSchema() *schema.Resource {
 			"body":                bodySchema(),
 			"cookies":             cookiesSchema(),
 			"headers":             headersSchema(),
+			"ja3_fingerprint":     ja3fingerprintSchema(),
 			"json_body":           jsonBodySchema(),
 			"method":              emptySchema(),
 			"query_string":        emptySchema(),
@@ -789,6 +790,23 @@ func cookiesMatchPatternSchema() *schema.Schema {
 	}
 }
 
+func ja3fingerprintSchema() *schema.Schema {
+	return &schema.Schema{
+		Type:     schema.TypeList,
+		Optional: true,
+		MaxItems: 1,
+		Elem: &schema.Resource{
+			Schema: map[string]*schema.Schema{
+				"fallback_behavior": {
+					Type:         schema.TypeString,
+					Required:     true,
+					ValidateFunc: validation.StringInSlice(wafv2.FallbackBehavior_Values(), false),
+				},
+			},
+		},
+	}
+}
+
 func bodySchema() *schema.Schema {
 	return &schema.Schema{
 		Type:     schema.TypeList,

internal/service/wafv2/web_acl_test.go

@@ -1156,6 +1156,54 @@ func TestAccWAFV2WebACL_ByteMatchStatement_basic(t *testing.T) {
 	})
 }
 
+func TestAccWAFV2WebACL_ByteMatchStatement_ja3fingerprint(t *testing.T) {
+	ctx := acctest.Context(t)
+	var v wafv2.WebACL
+	webACLName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
+	resourceName := "aws_wafv2_web_acl.test"
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:                 func() { acctest.PreCheck(ctx, t); testAccPreCheckScopeRegional(ctx, t) },
+		ErrorCheck:               acctest.ErrorCheck(t, wafv2.EndpointsID),
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories,
+		CheckDestroy:             testAccCheckWebACLDestroy(ctx),
+		Steps: []resource.TestStep{
+			{
+				Config: testAccWebACLConfig_byteMatchStatementJA3Fingerprint(webACLName, wafv2.FallbackBehaviorMatch),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckWebACLExists(ctx, resourceName, &v),
+					acctest.MatchResourceAttrRegionalARN(resourceName, "arn", "wafv2", regexache.MustCompile(`regional/webacl/.+$`)),
+					resource.TestCheckResourceAttr(resourceName, "name", webACLName),
+					resource.TestCheckResourceAttr(resourceName, "rule.#", "1"),
+					resource.TestCheckTypeSetElemNestedAttrs(resourceName, "rule.*", map[string]string{
+						"statement.0.byte_match_statement.0.field_to_match.0.ja3_fingerprint.#":                   "1",
+						"statement.0.byte_match_statement.0.field_to_match.0.ja3_fingerprint.0.fallback_behavior": "MATCH",
+					}),
+				),
+			},
+			{
+				Config: testAccWebACLConfig_byteMatchStatementJA3Fingerprint(webACLName, wafv2.FallbackBehaviorNoMatch),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckWebACLExists(ctx, resourceName, &v),
+					acctest.MatchResourceAttrRegionalARN(resourceName, "arn", "wafv2", regexache.MustCompile(`regional/webacl/.+$`)),
+					resource.TestCheckResourceAttr(resourceName, "name", webACLName),
+					resource.TestCheckResourceAttr(resourceName, "rule.#", "1"),
+					resource.TestCheckTypeSetElemNestedAttrs(resourceName, "rule.*", map[string]string{
+						"statement.0.byte_match_statement.0.field_to_match.0.ja3_fingerprint.#":                   "1",
+						"statement.0.byte_match_statement.0.field_to_match.0.ja3_fingerprint.0.fallback_behavior": "NO_MATCH",
+					}),
+				),
+			},
+			{
+				ResourceName:      resourceName,
+				ImportState:       true,
+				ImportStateVerify: true,
+				ImportStateIdFunc: testAccWebACLImportStateIdFunc(resourceName),
+			},
+		},
+	})
+}
+
 func TestAccWAFV2WebACL_ByteMatchStatement_jsonBody(t *testing.T) {
 	ctx := acctest.Context(t)
 	var v wafv2.WebACL
@@ -3090,6 +3138,57 @@ resource "aws_wafv2_web_acl" "test" {
 `, rName, positionalConstraint, searchString)
 }
 
+func testAccWebACLConfig_byteMatchStatementJA3Fingerprint(rName, fallbackBehavior string) string {
+	return fmt.Sprintf(`
+resource "aws_wafv2_web_acl" "test" {
+  name        = %[1]q
+  description = %[1]q
+  scope       = "REGIONAL"
+
+  default_action {
+    allow {}
+  }
+
+  rule {
+    name     = "rule-1"
+    priority = 1
+
+    action {
+      count {}
+    }
+
+    statement {
+      byte_match_statement {
+        field_to_match {
+          ja3_fingerprint {
+            fallback_behavior = %[2]q
+          }
+        }
+        positional_constraint = "EXACTLY"
+        search_string         = "abcdef1234567890abcdef1234567890"
+        text_transformation {
+          priority = 0
+          type     = "NONE"
+        }
+      }
+    }
+
+    visibility_config {
+      cloudwatch_metrics_enabled = false
+      metric_name                = "friendly-rule-metric-name"
+      sampled_requests_enabled   = false
+    }
+  }
+
+  visibility_config {
+    cloudwatch_metrics_enabled = false
+    metric_name                = "friendly-metric-name"
+    sampled_requests_enabled   = false
+  }
+}
+`, rName, fallbackBehavior)
+}
+
 func testAccWebACLConfig_byteMatchStatementJSONBody(rName, matchScope, invalidFallbackBehavior, oversizeHandling, matchPattern string) string {
 	return fmt.Sprintf(`
 resource "aws_wafv2_web_acl" "test" {

website/docs/r/wafv2_web_acl.html.markdown

@@ -814,12 +814,13 @@ The part of a web request that you want AWS WAF to inspect. Include the single `
 
 The `field_to_match` block supports the following arguments:
 
-~> **Note** Only one of `all_query_arguments`, `body`, `cookies`, `headers`, `json_body`, `method`, `query_string`, `single_header`, `single_query_argument`, or `uri_path` can be specified. An empty configuration block `{}` should be used when specifying `all_query_arguments`, `method`, or `query_string` attributes.
+~> **Note** Only one of `all_query_arguments`, `body`, `cookies`, `headers`, `ja3_fingerprint`, `json_body`, `method`, `query_string`, `single_header`, `single_query_argument`, or `uri_path` can be specified. An empty configuration block `{}` should be used when specifying `all_query_arguments`, `method`, or `query_string` attributes.
 
 * `all_query_arguments` - (Optional) Inspect all query arguments.
 * `body` - (Optional) Inspect the request body, which immediately follows the request headers. See [`body`](#body-block) below for details.
 * `cookies` - (Optional) Inspect the cookies in the web request. See [`cookies`](#cookies-block) below for details.
 * `headers` - (Optional) Inspect the request headers. See [`headers`](#headers-block) below for details.
+* `ja3_fingerprint` - (Optional) Inspect the JA3 fingerprint. See [`ja3_fingerprint`](#ja3_fingerprint-block) below for details.
 * `json_body` - (Optional) Inspect the request body as JSON. See [`json_body`](#json_body-block) for details.
 * `method` - (Optional) Inspect the HTTP method. The method indicates the type of operation that the request is asking the origin to perform.
 * `query_string` - (Optional) Inspect the query string. This is the part of a URL that appears after a `?` character, if any.
@@ -859,6 +860,12 @@ The `headers` block supports the following arguments:
 * `match_scope` - (Required) The parts of the headers to inspect with the rule inspection criteria. If you specify `All`, AWS WAF inspects both keys and values. Valid values include the following: `ALL`, `Key`, `Value`.
 * `oversize_handling` - (Required) Oversize handling tells AWS WAF what to do with a web request when the request component that the rule inspects is over the limits. Valid values include the following: `CONTINUE`, `MATCH`, `NO_MATCH`. See the AWS [documentation](https://docs.aws.amazon.com/waf/latest/developerguide/waf-rule-statement-oversize-handling.html) for more information.
 
+### `ja3_fingerprint` Block
+
+The `ja3_fingerprint` block supports the following arguments:
+
+* `fallback_behavior` - (Required) The match status to assign to the web request if the request doesn't have a JA3 fingerprint. Valid values include: `MATCH` or `NO_MATCH`.
+
 ### `json_body` Block
 
 The `json_body` block supports the following arguments: