PHP Security Triathlon: Filtering, Validation and Escaping -Validation

2 Validation data

PHP native implementation

Validating input data is also important. Unlike filtering, validation does not remove information from the input data, but only confirms that user input is as expected. If you enter an email address, make sure the user enters an email address; if you need a phone number, make sure the user enters a phone number, which is what verification does.
The verification is to ensure that the correct data conforming to a specific format is stored in the storage layer of the application. If invalid data is encountered, the data storage operation should be suspended and the corresponding error message displayed to remind the user to enter the correct data. Validation also avoids potential database errors. For example, if MySQL expects DATETIME a value of type and provides a DATE string, then MySQL will report an error or use the default value. Regardless of the processing method, the integrity of the application is subject to invalid data Destruction.

To implement input data validation, we can pass an FILTER_VALIDATE_*identifier to the filter_var function. PHP provides identifiers for validating Boolean values, email addresses, floating point numbers, integers, IPs, regular expressions, and URLs (see The following example shows how to verify an email address:

$input = '';
$isEmail = filter_var($input, FILTER_VALIDATE_EMAIL);
if ($isEmail !== FALSE) {
    echo 'success';
} else {
    echo 'failed';

We should pay special attention to filter_var the return value. If the verification is successful, the value to be verified is returned false. If the verification fails, it is returned .

With the help of PHP components

Although the filter_var function provides a lot of identifications for verification, it is a novelty and cannot be eaten all over the world. We cannot rely on it to verify all data. In addition to the filter_var function, there are the following components to help us complete more complex verification functions:

Note: The input data is both validated and filtered to ensure that it is as expected and secure.

Data validation implementation in Laravel

Most of the scenarios for data validation are on form submissions. Laravel also provides a wealth of methods for verifying user submitted data, which can meet almost any need. Here we briefly discuss its underlying implementation logic. Taking user registration as an example, AuthController a validator method is defined in:

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This rule will be used when registering new users. Laravel uses | to separate multiple validation rules. For email example, this rule indicates that the email field is required, it must be an email address, the maximum length is 255, and it is in the users table. only one. Let’s look at the implementation of the entire verification process. The validator method is called in RegistersUsers Trait (Illuminate\Foundation\Auth\RegistersUsers):

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The method is called first AuthController of validator method complete Validator(Illuminate\Validation\Validator. Initialization work and then call validatorinstancefailsmethod validation failed,failesmethod will be called againpasses` method:

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passes The method will eventually iterate through each rule (converted to an array at initialization) and call validate method:

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You can see here that the verification method corresponding to each rule is finally assembled and called. For email example, the final composition method is validateEmail that this verification method Validator has been defined in (in fact, each Rules can find the corresponding verification method here):

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Through the code we see that the PHP provided by this is called filter_var and passed in the FILTER_VALIDATE_EMAIL identity to verify whether the incoming field is a valid email address. Regarding the implementation of other validation rules, interested students can study Validator this class.

#php #laravel #validation

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PHP Security Triathlon: Filtering, Validation and Escaping -Validation
Wilford  Pagac

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Everything around us has become smart, like smart infrastructures, smart cities, autonomous vehicles, to name a few. The innovation of smart devices makes it possible to achieve these heights in science and technology. But, data is vulnerable, there is a risk of attack by cybercriminals. To get started, let’s know about IoT devices.

What are IoT devices?

The Internet Of Things(IoT) is a system that interrelates computer devices like sensors, software, and actuators, digital machines, etc. They are linked together with particular objects that work through the internet and transfer data over devices without humans interference.

Famous examples are Amazon Alexa, Apple SIRI, Interconnected baby monitors, video doorbells, and smart thermostats.

How could your IoT devices be vulnerable?

When technologies grow and evolve, risks are also on the high stakes. Ransomware attacks are on the continuous increase; securing data has become the top priority.

When you think your smart home won’t fudge a thing against cybercriminals, you should also know that they are vulnerable. When cybercriminals access our smart voice speakers like Amazon Alexa or Apple Siri, it becomes easy for them to steal your data.

Cybersecurity report 2020 says popular hacking forums expose 770 million email addresses and 21 million unique passwords, 620 million accounts have been compromised from 16 hacked websites.

The attacks are likely to increase every year. To help you secure your data of IoT devices, here are some best tips you can implement.

Tips to secure your IoT devices

1. Change Default Router Name

Your router has the default name of make and model. When we stick with the manufacturer name, attackers can quickly identify our make and model. So give the router name different from your addresses, without giving away personal information.

2. Know your connected network and connected devices

If your devices are connected to the internet, these connections are vulnerable to cyber attacks when your devices don’t have the proper security. Almost every web interface is equipped with multiple devices, so it’s hard to track the device. But, it’s crucial to stay aware of them.

3. Change default usernames and passwords

When we use the default usernames and passwords, it is attackable. Because the cybercriminals possibly know the default passwords come with IoT devices. So use strong passwords to access our IoT devices.

4. Manage strong, Unique passwords for your IoT devices and accounts

Use strong or unique passwords that are easily assumed, such as ‘123456’ or ‘password1234’ to protect your accounts. Give strong and complex passwords formed by combinations of alphabets, numeric, and not easily bypassed symbols.

Also, change passwords for multiple accounts and change them regularly to avoid attacks. We can also set several attempts to wrong passwords to set locking the account to safeguard from the hackers.

5. Do not use Public WI-FI Networks

Are you try to keep an eye on your IoT devices through your mobile devices in different locations. I recommend you not to use the public WI-FI network to access them. Because they are easily accessible through for everyone, you are still in a hurry to access, use VPN that gives them protection against cyber-attacks, giving them privacy and security features, for example, using Express VPN.

6. Establish firewalls to discover the vulnerabilities

There are software and firewalls like intrusion detection system/intrusion prevention system in the market. This will be useful to screen and analyze the wire traffic of a network. You can identify the security weakness by the firewall scanners within the network structure. Use these firewalls to get rid of unwanted security issues and vulnerabilities.

7. Reconfigure your device settings

Every smart device comes with the insecure default settings, and sometimes we are not able to change these default settings configurations. These conditions need to be assessed and need to reconfigure the default settings.

8. Authenticate the IoT applications

Nowadays, every smart app offers authentication to secure the accounts. There are many types of authentication methods like single-factor authentication, two-step authentication, and multi-factor authentication. Use any one of these to send a one time password (OTP) to verify the user who logs in the smart device to keep our accounts from falling into the wrong hands.

9. Update the device software up to date

Every smart device manufacturer releases updates to fix bugs in their software. These security patches help us to improve our protection of the device. Also, update the software on the smartphone, which we are used to monitoring the IoT devices to avoid vulnerabilities.

10. Track the smartphones and keep them safe

When we connect the smart home to the smartphone and control them via smartphone, you need to keep them safe. If you miss the phone almost, every personal information is at risk to the cybercriminals. But sometimes it happens by accident, makes sure that you can clear all the data remotely.

However, securing smart devices is essential in the world of data. There are still cybercriminals bypassing the securities. So make sure to do the safety measures to avoid our accounts falling out into the wrong hands. I hope these steps will help you all to secure your IoT devices.

If you have any, feel free to share them in the comments! I’d love to know them.

Are you looking for more? Subscribe to weekly newsletters that can help your stay updated IoT application developments.

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