How to prevent denial of service attacks in APIs written in PHP?
Many companies now use PHP to write APIs to connect to the front-end web/iOS/Android. The cloud and end are completely separated, and dynamic negotiation cannot be achieved. If both parties agree on a static KEY, it will be transparent in the js of the web. Even ios/android can easily obtain this KEY through package interception or decompilation.
Nowadays, the maximum concurrency that general cloud services can accept is only a few thousand. If it is full by a denial of service attack, it will inevitably affect the access of normal users. Especially when using a communication protocol like websocket, once a connection is established, it will always be in trouble. If you just write a simple multi-line simulated connection to harass it, the server will basically fail.
How to properly prevent such attacks on the PHP side? There is no need to go too extreme. Controlling the paralysis within 10 minutes should still be acceptable for ordinary small applications.
Reply content:
In fact, the problem mentioned by the question is widespread. It can be said from two aspects:Code aspect:
Programmer’s experience. Generally, it is the black and white list in terms of code, followed by the handling of interface timeout, and the rest are some specifications. In fact, there is no particularly good experience. More generally, ordinary hackers will not DDOS you directly. If it were a real DDOS, these would be enough for you. It is more about daily maintenance and handling of data anomalies.
Actually, you don’t have to worry about being maliciously attacked. To put it bluntly, the interface is also POST GET. As long as you filter the interface data to ensure the security of the data, common vulnerabilities can be prevented. Ordinary third-rate hackers will basically block this door. Unless your website is very famous, you can find a security company to do a test. Basically OK To deal with DDoS attacks, it is more about system-level protection. The API interface written by PHP is generally for business. What PHP for business can do is not to hang up and respond as quickly as possible
In addition, the machine load capacity should be taken into consideration , basically this kind of problem requires the use of flow control to limit the number of times a terminal can access a certain API within a period of time. 1. The authentication interface receives a client time and a signature. First verify that the client time and server time are within a certain error range (such as ±5 minutes, the larger the error range, the less secure), and then verify whether the signature is consistent (the signature algorithm must use the client time). After success, a token and a random string.
2. All interfaces except the authentication interface must receive token and a signature. First check whether the token is legal, and then verify whether the signature is consistent (the signature algorithm must use the random string returned by the authentication interface).
3. Strategies for all interfaces:
1) If the signature verification fails a certain number of times (1 time, 2 times, 3 times, the larger the number, the less secure), the IP will be blocked.
2) If a single IP call exceeds the limit (it is best to set different restrictions for each interface according to business needs. For example, you can request 5 times/day for login), block the IP. ip whitelist If it happens too often, the IP will be blocked. Don’t go to such trouble, use iptables

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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