Add security rules for GCM nonce reuse and AES ECB mode detection in Java #118
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WalkthroughThis pull request introduces two new security rules for Java applications: one for detecting GCM (Galois/Counter Mode) nonce reuse and another for identifying the use of AES in ECB mode. These rules aim to enhance cryptographic security by warning developers about potential vulnerabilities in encryption implementations. The changes include creating new rule definitions, test cases, and snapshot files to validate the detection of insecure cryptographic practices in Java code. Changes
Sequence DiagramsequenceDiagram
participant Dev as Developer
participant Rule as Security Rule
participant Code as Java Code
Dev->>Code: Writes encryption code
Code->>Rule: Trigger rule check
alt Nonce Reuse Detected
Rule-->>Dev: Warning: GCM Nonce Reused
end
alt ECB Mode Detected
Rule-->>Dev: Warning: Insecure AES Mode
end
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Actionable comments posted: 3
🧹 Nitpick comments (5)
tests/java/use-of-aes-ecb-java-test.yml (2)
8-14: Fix YAML formatting: Remove trailing spacesThere are trailing spaces at the end of several lines that should be removed for consistency.
- - | + - |🧰 Tools
🪛 yamllint (1.35.1)
[error] 8-8: trailing spaces
(trailing-spaces)
[error] 10-10: trailing spaces
(trailing-spaces)
[error] 12-12: trailing spaces
(trailing-spaces)
[error] 14-14: trailing spaces
(trailing-spaces)
2-4: Consider adding more valid test casesWhile CBC mode is a good choice, consider adding other secure modes as valid cases, such as:
- AES/GCM/NoPadding (authenticated encryption)
- AES/CTR/NoPadding (stream cipher mode)
rules/java/security/use-of-aes-ecb-java.yml (3)
5-6: Fix double space in message textThere's a double space between "and" and "is" in the message text.
- confidentiality and is not semantically secure so should not be used. + confidentiality and is not semantically secure so should not be used.
16-17: Review reference relevanceThe RC4 blog post reference seems out of place for a rule specifically about AES/ECB. Consider replacing it with AES-specific resources or removing it.
24-25: Consider enhancing the pattern matchingThe current regex pattern might miss some edge cases. Consider:
- Case-insensitive matching
- Handling whitespace variations
- Catching raw "ECB" mode specification
- regex: "AES/ECB" + regex: "(?i)AES\s*/\s*ECB|ECB\s*mode"
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (6)
rules/java/security/gcm-nonce-reuse-java.yml(1 hunks)rules/java/security/use-of-aes-ecb-java.yml(1 hunks)tests/__snapshots__/gcm-nonce-reuse-java-snapshot.yml(1 hunks)tests/__snapshots__/use-of-aes-ecb-java-snapshot.yml(1 hunks)tests/java/gcm-nonce-reuse-java-test.yml(1 hunks)tests/java/use-of-aes-ecb-java-test.yml(1 hunks)
✅ Files skipped from review due to trivial changes (1)
- tests/snapshots/use-of-aes-ecb-java-snapshot.yml
🧰 Additional context used
🪛 yamllint (1.35.1)
tests/java/use-of-aes-ecb-java-test.yml
[error] 8-8: trailing spaces
(trailing-spaces)
[error] 10-10: trailing spaces
(trailing-spaces)
[error] 12-12: trailing spaces
(trailing-spaces)
[error] 14-14: trailing spaces
(trailing-spaces)
🔇 Additional comments (2)
rules/java/security/use-of-aes-ecb-java.yml (1)
18-28: Verify pattern matching effectiveness
Let's verify if the pattern catches all relevant cases in the codebase.
✅ Verification successful
Pattern matching is appropriate for detecting AES/ECB usage
The rule's pattern matching strategy is well-designed for detecting AES/ECB usage in Java code:
- It correctly targets method invocations with string literals containing "AES/ECB"
- This matches the common pattern of
Cipher.getInstance("AES/ECB/...")calls - The pattern is simple yet effective, as ECB mode is typically specified explicitly in the cipher string
While there are no Java files in this repository to test against (as shown by the empty fd results), the rule itself is properly constructed to catch the security risk when applied to Java codebases.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for potential AES/ECB usage patterns that might be missed
rg -i "(?:getInstance|getProvider).*(?:AES.*ECB|ECB.*mode)" --type java
# Search for general crypto-related code that might need review
ast-grep --pattern 'class $_ {
$$$
$_(Cipher|KeyGenerator|SecretKeyFactory|Mac) $_($$$) {
$$$
}
$$$
}'
Length of output: 339
Script:
#!/bin/bash
# First, let's check if there are any Java files in the repository
fd -e java
# Let's also check for any test files or examples that might contain AES/ECB usage
fd -g "*test*.java" -g "*example*.java"
# Let's look for any crypto-related files
fd -g "*crypto*.java" -g "*cipher*.java" -i
# Check the actual pattern being used in the rule
cat rules/java/security/use-of-aes-ecb-java.yml
Length of output: 1307
tests/__snapshots__/gcm-nonce-reuse-java-snapshot.yml (1)
1-14: Update snapshots to match expanded test coverage
The current snapshot only covers the basic GCMParameterSpec creation case. Once the test cases are expanded as suggested above, the snapshots should be regenerated to include all test scenarios.
Run this script to verify snapshot coverage matches test cases:
Summary by CodeRabbit
New Features
Tests
Snapshots