Add security rules for detecting password vulnerabilities in Python #146
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WalkthroughThis pull request introduces several new security rules for Python applications focusing on detecting potential vulnerabilities related to password management in various libraries like pymongo and webrepl. The rules primarily target two main security concerns: using empty passwords and hardcoding secrets in database and network connection configurations. Each rule is designed to flag instances where sensitive authentication mechanisms might be compromised, providing warnings and references to security best practices. Changes
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Actionable comments posted: 5
♻️ Duplicate comments (1)
tests/python/python-pymongo-hardcoded-secret-python-test.yml (1)
4-4:⚠️ Potential issueFix incorrect environment variable access syntax
Similar to the previous file, the valid test case uses incorrect syntax
os.env. In Python, environment variables are accessed throughos.environ.Apply this diff to fix the environment variable access:
- pymongo.MongoClient(password=os.env['secret']) + pymongo.MongoClient(password=os.environ['secret'])
🧹 Nitpick comments (11)
tests/python/python-webrepl-hardcoded-secret-python-test.yml (1)
1-9: Enhance test coverage with additional scenarios.While the current test cases cover basic scenarios, consider adding these additional cases to improve coverage:
- Empty string password:
webrepl.start(password="")- Password from configuration file:
webrepl.start(password=config.get('password'))- Password from command line args:
webrepl.start(password=sys.argv[1])- Multi-line string password:
webrepl.start(password="""secret""")- f-string password:
webrepl.start(password=f"secret{var}")rules/python/security/python-webrepl-hardcoded-secret-python.yml (1)
4-14: Enhance documentation with examples and specific guidance.The security message and references are good, but consider enhancing the note section with:
- Code examples of secure alternatives:
# Bad webrepl.start(password="secret") # Good webrepl.start(password=os.getenv('WEBREPL_PASSWORD'))- Specific guidance on secure storage options:
- How to use environment variables
- Recommended vault solutions
- Best practices for HSM integration
tests/python/python-pymongo-empty-password-python-test.yml (1)
Line range hint
1-9: Consider adding more test cases for comprehensive coverageThe test file could benefit from additional test cases:
- Using
os.getenv()with default value- Using password from configuration file
- Using password from secure vault
tests/python/python-webrepl-empty-password-python-test.yml (1)
Line range hint
1-9: Enhance test coverage with environment variable casesConsider adding test cases for:
- Reading password from environment variables
- Reading password from secure vault
tests/python/python-pymongo-hardcoded-secret-python-test.yml (1)
8-9: Enhance invalid test cases for better detectionConsider adding more sophisticated invalid cases to test the rule's effectiveness:
- Base64 encoded passwords
- Concatenated string literals
- Variable assignments with string literals
rules/python/security/python-webrepl-empty-password-python.yml (1)
19-44: Consider simplifying the AST patternThe current AST pattern uses nested conditions that could be simplified. Consider using a more direct pattern to match the password argument.
rules/python/security/python-pymongo-hardcoded-secret-python.yml (2)
43-72: Consider enabling the commented pattern for direct imports.The commented pattern for direct
MongoClientimports would catch additional cases. Consider enabling it with a test case to validate its effectiveness.- # $pymongo.MongoClient(..., password="",...): - # kind: call + $pymongo.MongoClient(..., password="",...): + kind: call
11-14: Enhance security references with additional resources.Consider adding these relevant security references:
- NIST Guidelines for Password-Based Authentication
- MongoDB Security Checklist
[CWE-798]: Use of Hard-coded Credentials [OWASP A07:2021]: Identification and Authentication Failures [REFERENCES] - https://cheatsheetseries.owasp.org/cheatsheets/Secrets_Management_Cheat_Sheet.html + https://cheatsheetseries.owasp.org/cheatsheets/Secrets_Management_Cheat_Sheet.html + https://csrc.nist.gov/publications/detail/sp/800-63b/final + https://www.mongodb.com/docs/manual/administration/security-checklist/rules/python/security/python-pymongo-empty-password-python.yml (3)
4-10: Enhance the warning message with specific MongoDB context.The current message is generic. Consider adding MongoDB-specific security recommendations.
The application creates a database connection with an empty password. This can lead to unauthorized access by either an internal or external malicious actor. To prevent this vulnerability, enforce authentication when connecting to a database by using environment variables to securely provide credentials or retrieving them from a secure vault or HSM - (Hardware Security Module). + (Hardware Security Module). For MongoDB specifically, consider using + X.509 certificates or LDAP authentication as more secure alternatives + to password-based authentication.
19-45: Consider coordinating pattern matching between security rules.The empty password rule and hardcoded secret rule have overlapping patterns. Consider:
- Creating a shared utility pattern for
MongoClientdetection- Focusing this rule specifically on empty string detection
utils: # Shared pattern for both rules mongodb_client_base: kind: call all: - has: stopBy: neighbor kind: attribute regex: ^pymongo.MongoClient$ - has: stopBy: neighbor kind: argument_list # Rule-specific pattern empty_password: extends: mongodb_client_base has: stopBy: neighbor kind: keyword_argument all: - has: stopBy: neighbor kind: identifier regex: ^password$ - has: stopBy: neighbor kind: string not: has: stopBy: end kind: string_contentAlso applies to: 77-80
81-88: Optimize error condition handling.The error condition pattern is duplicated across rules. Consider extracting it into a shared utility.
utils: not_in_error_block: not: all: - has: stopBy: end kind: ERROR - inside: stopBy: end kind: ERROR rule: kind: call all: - matches: empty_password - matches: not_in_error_block
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📒 Files selected for processing (13)
rules/python/security/python-pymongo-empty-password-python.yml(1 hunks)rules/python/security/python-pymongo-hardcoded-secret-python.yml(1 hunks)rules/python/security/python-webrepl-empty-password-python.yml(1 hunks)rules/python/security/python-webrepl-hardcoded-secret-python.yml(1 hunks)tests/__snapshots__/python-pymongo-empty-password-python-snapshot.yml(1 hunks)tests/__snapshots__/python-pymongo-hardcoded-secret-python-snapshot.yml(1 hunks)tests/__snapshots__/python-requests-empty-password-python-snapshot.yml(1 hunks)tests/__snapshots__/python-webrepl-empty-password-python-snapshot.yml(1 hunks)tests/__snapshots__/python-webrepl-hardcoded-secret-python-snapshot.yml(1 hunks)tests/python/python-pymongo-empty-password-python-test.yml(1 hunks)tests/python/python-pymongo-hardcoded-secret-python-test.yml(1 hunks)tests/python/python-webrepl-empty-password-python-test.yml(1 hunks)tests/python/python-webrepl-hardcoded-secret-python-test.yml(1 hunks)
✅ Files skipped from review due to trivial changes (3)
- tests/snapshots/python-pymongo-hardcoded-secret-python-snapshot.yml
- tests/snapshots/python-webrepl-empty-password-python-snapshot.yml
- tests/snapshots/python-pymongo-empty-password-python-snapshot.yml
🔇 Additional comments (2)
tests/__snapshots__/python-webrepl-hardcoded-secret-python-snapshot.yml (1)
1-64: LGTM! Comprehensive snapshot definitions.The snapshots are well-structured with precise source positions and appropriate styling labels for both primary and secondary matches.
tests/python/python-webrepl-empty-password-python-test.yml (1)
4-4: Verify SECURE_PASSWORD_CONFIG availabilityThe valid test case assumes
SECURE_PASSWORD_CONFIGis defined. Consider adding a test setup to ensure this configuration is available.
Summary by CodeRabbit
New Features
pymongoandwebrepllibraries to enhance security checksSecurity Improvements
Testing