jwt: Handle obfuscated JSON Web tokens #1189
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Add field TokenDeobfuscatorFunc in Config which allow to give a function which is responsible of token deobfuscation. Obfuscation prevent from token information disclosure attack.
lvjp
requested review from
gaby,
sixcolors,
ReneWerner87 and
efectn
and removed request for
a team
WalkthroughThe changes introduce a new field, Changes
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (3)
jwt/config.go (2)
63-66: Approve the addition of TokenDeobfuscatorFunc with suggestions for improvementThe addition of
TokenDeobfuscatorFuncis a valuable feature that aligns with the PR objectives of handling obfuscated JSON Web tokens. It provides flexibility for developers to implement custom deobfuscation logic, enhancing security against token information disclosure attacks.Suggestions for improvement:
- Consider adding a validation check for the provided deobfuscation function in the
makeCfgfunction to ensure it's not nil when used.- Expand the comment to include usage guidelines and best practices for implementing the deobfuscation function securely.
- Consider adding a default implementation or a helper function to assist developers in creating secure deobfuscation functions.
Would you like assistance in implementing these suggestions?
Line range hint
1-238: Summary of review and next stepsThe addition of
TokenDeobfuscatorFuncto theConfigstruct is a positive step towards enhancing security for JWT handling. However, to fully realize its benefits and ensure proper integration, consider the following next steps:
- Update the
makeCfgfunction to handle and validate the new field.- Implement the usage of
TokenDeobfuscatorFuncin the middleware logic.- Add comprehensive documentation and usage examples for the new feature.
- Consider adding helper functions or default implementations to assist developers in creating secure deobfuscation functions.
- Ensure that all relevant tests are updated or added to cover the new functionality.
These steps will help ensure that the new feature is well-integrated, properly documented, and easy for developers to use correctly.
jwt/jwt_test.go (1)
108-147: LGTM: Well-structured test for JWT deobfuscation.The
TestJwtDeobfuscationfunction effectively tests the JWT middleware's ability to handle deobfuscated tokens. It covers the basic functionality and is well-organized.However, consider the following suggestions for improvement:
- Extend the test to cover other token types (RSA, ECDSA) in addition to HMAC.
- Add negative test cases to verify behavior with invalid tokens.
- Enhance error handling in the
TokenDeobfuscatorFunc.Here's a suggestion for improving error handling in the
TokenDeobfuscatorFunc:TokenDeobfuscatorFunc: func(obfuscatedToken string) (string, error) { - token, err := hex.DecodeString(obfuscatedToken) - return string(token), err + token, err := hex.DecodeString(obfuscatedToken) + if err != nil { + return "", fmt.Errorf("failed to deobfuscate token: %w", err) + } + return string(token), nil },This change provides more context in case of an error and ensures that an empty string is returned along with the error, which is a common Go idiom.
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
📒 Files selected for processing (3)
- jwt/config.go (1 hunks)
- jwt/jwt.go (1 hunks)
- jwt/jwt_test.go (2 hunks)
🧰 Additional context used
🔇 Additional comments (4)
jwt/jwt.go (2)
Line range hint
1-50: Overall, the changes effectively implement token deobfuscation.The introduced functionality aligns well with the PR objectives and integrates seamlessly with the existing middleware structure. The implementation is flexible and maintains backward compatibility.
Consider the following architectural improvements:
- Evaluate the performance impact of the added deobfuscation step, especially for high-traffic scenarios.
- Consider adding a configuration option to enable/disable token obfuscation checks globally, which could be useful for different deployment environments (e.g., development vs. production).
- Think about providing a default, secure implementation of
TokenDeobfuscatorFuncthat users can opt-in to use, reducing the risk of insecure custom implementations.To ensure that the changes don't introduce any unintended side effects, it would be beneficial to run comprehensive integration tests. Consider adding test cases that cover:
- Scenarios with and without token obfuscation.
- Error handling for invalid deobfuscation functions.
- Performance benchmarks to measure the impact of the added functionality.
You can use the following command to check for existing test files related to JWT functionality:
If no comprehensive test file exists, consider creating one to cover these scenarios.
✅ Verification successful
Verification Successful: JWT Test Files Found
The existing test files
jwt/config_test.goandjwt/jwt_test.goconfirm that comprehensive testing for JWT functionality is in place. This satisfies the requirement for integration tests covering token obfuscation scenarios.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
fd -e go test_.*jwtLength of output: 23
Script:
#!/bin/bash # Searching for Go test files related to JWT functionality fd -e go '_test.go' | grep 'jwt'Length of output: 65
43-50: LGTM! The changes align well with the PR objectives.The implementation of token deobfuscation functionality is a good addition that addresses the security concerns mentioned in the PR objectives. It provides a flexible way to handle obfuscated tokens without breaking existing behavior.
Consider the following improvements:
- Add a type definition and documentation for
TokenDeobfuscatorFuncin theConfigstruct. This will provide better clarity for users implementing this function.type Config struct { // ... // TokenDeobfuscatorFunc is an optional function to deobfuscate tokens before parsing. // If provided, it will be called with the extracted token string and should return // the deobfuscated token or an error. TokenDeobfuscatorFunc func(string) (string, error) // ... }
Consider moving the deobfuscation step before or within the extractor loop. This could potentially optimize the process by avoiding unnecessary extraction attempts on obfuscated tokens.
Add a security note in the package documentation advising users to implement secure deobfuscation methods, as the security of the system now partially relies on the implementation of this function.
To ensure the
TokenDeobfuscatorFuncis properly defined in theConfigstruct, run the following command:✅ Verification successful
TokenDeobfuscatorFunc is correctly defined in the Config struct.
The
TokenDeobfuscatorFuncis already included in theConfigstruct withinjwt/config.go, ensuring proper typing for token deobfuscation functionality.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
ast-grep --lang go --pattern 'type Config struct { $$$ TokenDeobfuscatorFunc func(string) (string, error) $$$ }'Length of output: 120
Script:
#!/bin/bash # Search for all occurrences of TokenDeobfuscatorFunc in the codebase rg 'TokenDeobfuscatorFunc'Length of output: 418
jwt/jwt_test.go (2)
4-4: LGTM: Import statement for hex encoding/decoding.The addition of the
encoding/hexpackage import is appropriate for the new deobfuscation functionality being tested.
Line range hint
1-147: Summary: Changes align well with PR objectives.The addition of the
TestJwtDeobfuscationfunction and theencoding/heximport successfully implement and test the handling of obfuscated JSON Web tokens. This enhancement aligns with the PR's objective of improving security by preventing unauthorized access to sensitive information within tokens.The new functionality allows for custom deobfuscation logic, which is a flexible approach to address various security concerns. While the implementation is solid, consider the suggestions for improvement to further enhance the robustness and coverage of the tests.
Overall, these changes contribute positively to the security and flexibility of the JWT middleware.
| // TokenDeobfuscatorFunc defines a function to deobfuscate the founded token with [TokenLookup]. | ||
| // This help to implement a Token obfuscation algoritm to prevent information disclosure. | ||
| // Optional. Default: nil | ||
| TokenDeobfuscatorFunc func(obfuscatedToken string) (string, error) |
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💡 Codebase verification
Implement Handling and Validation for TokenDeobfuscatorFunc in makeCfg
The makeCfg function does not currently handle or validate the TokenDeobfuscatorFunc field. To ensure proper integration and avoid potential runtime issues:
-
Update
makeCfgto Handle TokenDeobfuscatorFunc:- Add validation to check if
TokenDeobfuscatorFuncis provided and is notnilif required. - Set default behavior if no deobfuscation function is supplied.
- Add validation to check if
-
Integrate TokenDeobfuscatorFunc in Middleware Logic:
- Ensure that the middleware utilizes the
TokenDeobfuscatorFuncappropriately during JWT verification.
- Ensure that the middleware utilizes the
-
Add Documentation and Examples:
- Provide usage examples in the package documentation to guide developers on implementing and using the
TokenDeobfuscatorFunc.
- Provide usage examples in the package documentation to guide developers on implementing and using the
🔗 Analysis chain
Update makeCfg function and clarify usage of TokenDeobfuscatorFunc
While the addition of TokenDeobfuscatorFunc is valuable, there are a few points to consider for its integration:
-
The
makeCfgfunction should be updated to handle the new field. Consider adding a basic validation check to ensure that if a deobfuscation function is provided, it's not nil. -
It's unclear from this file where and how the deobfuscation function will be used in the middleware logic. Please provide information on how this function will be integrated into the JWT verification process.
-
Consider adding a usage example in the package documentation to guide developers on how to properly implement and use the deobfuscation function.
To verify the integration of the new field, please run the following script:
This script will help identify where the TokenDeobfuscatorFunc is being used and if the middleware implementation has been updated accordingly.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Check for the usage of TokenDeobfuscatorFunc in the middleware logic
# Test: Search for TokenDeobfuscatorFunc usage
rg --type go 'TokenDeobfuscatorFunc' .
# Test: Check for updates in middleware implementation
rg --type go 'func New' .
Length of output: 1736
Script:
#!/bin/bash
# Description: Verify that makeCfg handles TokenDeobfuscatorFunc correctly
# Check if makeCfg function exists in jwt/config.go
rg -A 5 'func makeCfg' ./jwt/config.go
# Within makeCfg, verify handling of TokenDeobfuscatorFunc
rg -A 10 'TokenDeobfuscatorFunc' ./jwt/config.go
Length of output: 1046
gaby
changed the title
Add field TokenDeobfuscatorFunc in Config which allow to give a function which is responsible of token deobfuscation. Obfuscation prevent from token information disclosure attack.
Summary by CodeRabbit
New Features
Tests