Add Security Rules for Cryptography and Authentication in Java Applications #117
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WalkthroughThis pull request introduces three new security rules for Java applications, focusing on cryptographic and authentication practices. The rules address potential vulnerabilities in encryption key sizes (Blowfish), default AES encryption settings, and hard-coded passwords in the Jedis library. Each rule is accompanied by corresponding test cases that validate both correct and incorrect usage scenarios. The changes aim to enhance security checks by identifying insecure coding practices related to cryptographic implementations and credential management. Changes
Sequence DiagramsequenceDiagram
participant Dev as Developer
participant Rule as Security Rule
participant Code as Java Code
Dev->>Code: Writes Java encryption code
Code->>Rule: Triggers rule check
alt Insecure Key Size
Rule-->>Dev: Warns about insufficient Blowfish key size
end
alt Unsafe AES Default
Rule-->>Dev: Suggests more secure AES configuration
end
alt Hardcoded Password
Rule-->>Dev: Alerts about security risk in credentials
end
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Actionable comments posted: 5
🧹 Nitpick comments (8)
rules/java/security/jedis-jedisfactory-hardcoded-password-java.yml (2)
15-186: Optimize pattern matching structureThe patterns have significant duplication in their structure. Consider refactoring to use shared pattern definitions.
- Extract common method invocation pattern
- Extract common variable declaration pattern
- Use pattern references to compose final rules
Example structure:utils: COMMON_PASSWORD_METHOD: kind: method_invocation all: - has: kind: identifier pattern: $R - has: kind: identifier regex: '^setPassword$' # ... more shared patterns🧰 Tools
🪛 yamllint (1.35.1)
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322-324: Consider additional password constraintsThe current constraint only checks for empty strings. Consider adding checks for:
- Common default passwords
- Short passwords
- Simple patterns
constraints: E: not: any: - regex: ^""$ - regex: ^(password|admin|test)$ - regex: ^.{1,8}$🧰 Tools
🪛 yamllint (1.35.1)
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tests/java/blowfish-insufficient-key-size-java-test.yml (1)
8-23: Consider adding more edge cases for comprehensive testing.While the current invalid test cases cover basic scenarios, consider adding:
- Upper bound tests (e.g., 127-bit keys)
- Common weak key sizes (e.g., 32-bit, 56-bit)
- More malformed inputs (e.g., null, empty string)
rules/java/security/blowfish-insufficient-key-size-java.yml (1)
9-10: Consider adding more security references.While the OWASP Top 10 reference is valuable, consider adding:
- NIST recommendations for key sizes
- CVE examples of Blowfish vulnerabilities
- Migration guides to AES
rules/java/security/use-of-default-aes-java.yml (2)
1-15: LGTM! Consider adding NIST reference for completeness.The rule configuration is well-structured with clear messaging and relevant references. Consider adding NIST SP 800-38A reference which specifically discusses block cipher modes of operation.
Add this reference to strengthen the documentation:
[REFERENCES] - https://owasp.org/Top10/A02_2021-Cryptographic_Failures - https://googleprojectzero.blogspot.com/2022/10/rc4-is-still-considered-harmful.html + - https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38a.pdf
16-95: LGTM! Consider adding pattern for string concatenation.The pattern matching is comprehensive, covering various ways of instantiating AES cipher. However, it might miss cases where the string "AES" is constructed through concatenation.
Consider adding this pattern to catch string concatenation:
rule: any: + - pattern: Cipher.getInstance("A" + "ES") + inside: + stopBy: end + kind: class_declaration + follows: + stopBy: end + kind: import_declaration + any: + - pattern: import javax.*; + - pattern: import javax; + - pattern: import javax.crypto.*; - pattern: Cipher.getInstance("AES")tests/__snapshots__/use-of-default-aes-java-snapshot.yml (1)
1-125: Consider adding negative test cases and edge cases.The test snapshots comprehensively cover valid patterns, but could benefit from additional cases to ensure the rule doesn't produce false positives.
Consider adding these test cases:
- Negative cases (shouldn't match):
? | import javax.crypto.*; class AES { public void safeAES() { Cipher.getInstance("AES/CBC/PKCS5Padding"); } } : labels: []
- String concatenation case (should match):
? | import javax.crypto.*; class AES { public void unsafeAES() { Cipher.getInstance("A" + "ES"); } } : labels: - source: Cipher.getInstance("A" + "ES") style: primarytests/__snapshots__/blowfish-insufficient-key-size-java-snapshot.yml (1)
1-164: Consider adding boundary test cases and variable key sizes.While the current test cases cover basic scenarios, adding boundary cases and variable key sizes would improve coverage.
Consider adding these test cases:
- Boundary case (128 bits):
? | public void safeKeySize() { KeyGenerator keyGen = KeyGenerator.getInstance("Blowfish"); keyGen.init(128); } : labels: []
- Variable key size:
? | public void variableKeySize() { KeyGenerator keyGen = KeyGenerator.getInstance("Blowfish"); int keySize = 64; keyGen.init(keySize); } : labels: - source: keyGen.init(keySize) style: primary
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📒 Files selected for processing (9)
rules/java/security/blowfish-insufficient-key-size-java.yml(1 hunks)rules/java/security/jedis-jedisfactory-hardcoded-password-java.yml(1 hunks)rules/java/security/use-of-default-aes-java.yml(1 hunks)tests/__snapshots__/blowfish-insufficient-key-size-java-snapshot.yml(1 hunks)tests/__snapshots__/jedis-jedisfactory-hardcoded-password-java-snapshot.yml(1 hunks)tests/__snapshots__/use-of-default-aes-java-snapshot.yml(1 hunks)tests/java/blowfish-insufficient-key-size-java-test.yml(1 hunks)tests/java/jedis-jedisfactory-hardcoded-password-java-test.yml(1 hunks)tests/java/use-of-default-aes-java-test.yml(1 hunks)
🧰 Additional context used
🪛 yamllint (1.35.1)
tests/java/use-of-default-aes-java-test.yml
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rules/java/security/jedis-jedisfactory-hardcoded-password-java.yml
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rules/java/security/blowfish-insufficient-key-size-java.yml
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🔇 Additional comments (5)
rules/java/security/jedis-jedisfactory-hardcoded-password-java.yml (1)
4-9: LGTM: Clear and informative security message
The warning message effectively communicates the security risk and provides actionable mitigation strategies.
tests/__snapshots__/jedis-jedisfactory-hardcoded-password-java-snapshot.yml (1)
1-404: LGTM: Snapshot correctly captures test patterns
The snapshot file accurately reflects the test cases and their matching patterns.
tests/java/blowfish-insufficient-key-size-java-test.yml (1)
1-7: LGTM! Valid test case properly validates secure key size.
The test correctly validates the use of 128-bit keys for Blowfish encryption, which aligns with security best practices.
tests/java/use-of-default-aes-java-test.yml (1)
2-5: LGTM! Valid cases correctly allow KeyGenerator instantiation.
The test properly validates the KeyGenerator usage while focusing on Cipher instantiation issues.
rules/java/security/blowfish-insufficient-key-size-java.yml (1)
1-8: LGTM! Well-documented security rule with appropriate severity.
The rule correctly identifies insufficient key sizes for Blowfish with proper security context and CWE reference.
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Summary by CodeRabbit
New Features
Bug Fixes
Tests