Скачать или смотреть Solving the DelegatingPasswordEncoder Issue in Spring Security: Handling Passwords Without Prefix

Discover how to resolve the 'There is no PasswordEncoder mapped for the id "null"' error in Spring Security when managing passwords without prefixes using DelegatingPasswordEncoder.
---
This video is based on the question https://stackoverflow.com/q/72021698/ asked by the user 'sergio jauregui' ( https://stackoverflow.com/u/15863607/ ) and on the answer https://stackoverflow.com/a/72023381/ provided by the user 'Chetan Ahirrao' ( https://stackoverflow.com/u/6551263/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Spring Security DelegatingPasswordEncoder doesn't validate passwords that have no prefix

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Resolving the DelegatingPasswordEncoder Issue in Spring Security: Handling Passwords Without Prefix

When developing applications using Spring Security, you may encounter a common issue related to password encoding: the error message stating, "There is no PasswordEncoder mapped for the id 'null'." This typically occurs when you implement the DelegatingPasswordEncoder to manage password encoding and decoding, especially if the passwords in your database do not have a specified prefix. In this guide, we’ll explore why this error happens and how to effectively solve it.

Understanding the Problem

The DelegatingPasswordEncoder is a powerful feature in Spring Security that allows you to manage multiple PasswordEncoder instances based on a specific prefix in your stored passwords. Each password stored in your database may be prefixed on encoding, which identifies the encoding mechanism that should be used for verification.

However, if your previously stored passwords do not have any prefix, attempting to authenticate them using DelegatingPasswordEncoder without a default encoder could lead to an IllegalArgumentException. This is because Spring Security doesn't know what PasswordEncoder to use for passwords that do not specify an identifier.

Why Does This Happen?

The primary reason for this error is that if your application encounters a password with no prefix, it defaults to using the UnmappedIdPasswordEncoder. Since it doesn’t know which encoder to map to, it throws the error.

Solution: Setting a Default Password Encoder

To resolve the issue with passwords lacking a prefix, we need to define a default PasswordEncoder that will be used by the DelegatingPasswordEncoder. This ensures that all passwords, regardless of whether they have a prefix, are processed correctly.

Implementation Steps

Here’s how you can implement a solution using DelegatingPasswordEncoder in your Spring application. Follow these steps carefully:

Configure Password Encoders:
In your @ Configuration class, define a bean for PasswordEncoder. Make sure to include a no-operation password encoder (NoOpPasswordEncoder) for plain text passwords.

[[See Video to Reveal this Text or Code Snippet]]

Set the Default Password Encoder:
Use the method setDefaultPasswordEncoderForMatches to define the encoder that will be used for passwords without a prefix. Ensure you add this after creating the DelegatingPasswordEncoder.

[[See Video to Reveal this Text or Code Snippet]]

Testing:
Make sure to test your implementation thoroughly. Try authenticating users with both prefixed and non-prefixed passwords to ensure the error is resolved and everything functions correctly.

Conclusion

By following these steps, you will be able to effectively manage passwords that have no prefixes in Spring Security using the DelegatingPasswordEncoder. This solution not only eliminates the error but also enhances your application's security by ensuring proper encoding practices are followed.

If you encounter further issues or have any questions related to password encoding in Spring Security, feel free to reach out. Happy coding!