Add security rules for pymongo and pymssql to detect empty passwords and secrets #97
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WalkthroughThis pull request introduces several new security rules for Python applications using the Changes
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Actionable comments posted: 6
🧹 Outside diff range and nitpick comments (8)
tests/python/python-pymongo-hardcoded-secret-python-test.yml (2)
15-15: Remove unnecessary semicolonPython doesn't require semicolons at the end of statements.
- password = "aaaa"; + password = "aaaa"
1-16: Consider adding more test casesThe current test cases could be enhanced by adding:
- Password from configuration file
- Password from secure vault/key management service
- Password from connection string
- Complex password scenarios with special characters
Would you like me to provide examples for these additional test cases?
tests/python/python-pymongo-empty-password-python-test.yml (1)
17-17: Remove unnecessary semicolonPython doesn't require semicolons at the end of statements.
- password = ""; + password = ""tests/__snapshots__/python-pymongo-hardcoded-secret-python-snapshot.yml (1)
1-133: Consider adding documentation commentsThe snapshot file would benefit from a header comment explaining:
- The purpose of the snapshot
- How it's generated
- When it should be regenerated
Would you like me to provide an example header comment?
rules/python/security/python-pymongo-empty-password-python.yml (1)
16-66: Consider enhancing pattern matching for edge casesThe current patterns might miss some scenarios where empty passwords could be passed:
- F-strings:
f""- String formatting:
"".format()- String interpolation:
%s% ""Consider adding patterns to catch these cases:
utils: match_call: # ... existing pattern ... + match_f_string: + kind: expression_statement + has: + kind: f_string + all: + - has: + kind: f_string_start + - has: + kind: f_string_endrules/python/security/python-pymssql-empty-password-python.yml (1)
4-10: Enhance the security message with specific implicationsThe current message could be more impactful by including specific security implications and best practices.
Consider updating the message to:
message: >- 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). + This is a critical security vulnerability that allows unrestricted database access, + potentially exposing sensitive data to unauthorized users. To prevent this: + 1. Never use empty passwords in any environment + 2. Use environment variables (e.g., os.environ['DB_PASSWORD']) + 3. Implement a secrets management solution (e.g., AWS Secrets Manager, HashiCorp Vault) + 4. Consider using connection pooling with proper authenticationtests/python/python-pymssql-empty-password-python-test.yml (2)
2-23: Expand test coverage for valid scenariosThe current valid test cases could be more comprehensive.
Consider adding these additional test cases:
valid: - | conn5 = _mssql.connect( server='SQL01', user='user', password=pswd2, database='mydatabase' ) - | conn6 = _mssql.connect( server='SQL01', user='user', password=os.env['pswd2'], database='mydatabase' ) - | conn7 = _mssql.connect( server='SQL01', user='user', password=os.getenv('secret'), database='mydatabase' ) + - | + conn8 = _mssql.connect( + server='SQL01', + user='user', + password=keyring.get_password('system', 'db_password'), + database='mydatabase' + ) + - | + conn9 = _mssql.connect( + server='SQL01', + user='user', + password=get_secret_from_vault('db_password'), + database='mydatabase' + )
47-47: Remove trailing whitespaceThere's a trailing whitespace at the end of line 47.
- pswd2 = get_from_config() + pswd2 = get_from_config()🧰 Tools
🪛 yamllint (1.35.1)
[error] 47-47: trailing spaces
(trailing-spaces)
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📒 Files selected for processing (9)
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-pymssql-empty-password-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-pymssql-empty-password-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-pymssql-empty-password-python-test.yml(1 hunks)
✅ Files skipped from review due to trivial changes (1)
- tests/snapshots/python-pymongo-empty-password-python-snapshot.yml
🧰 Additional context used
🪛 yamllint (1.35.1)
tests/python/python-pymssql-empty-password-python-test.yml
[error] 47-47: trailing spaces
(trailing-spaces)
🔇 Additional comments (7)
tests/__snapshots__/python-pymongo-hardcoded-secret-python-snapshot.yml (1)
59-59: Update snapshot after fixing test cases
This snapshot contains the semicolon that needs to be removed from the test case. After fixing the issues in the test files, please regenerate this snapshot.
rules/python/security/python-pymongo-empty-password-python.yml (2)
1-15: LGTM: Well-structured metadata with clear security context
The rule metadata is well-defined with appropriate severity level and comprehensive messaging that includes:
- Clear problem description
- Security implications
- Mitigation strategies
- Relevant CWE/OWASP references
133-136: Verify rule coverage with test cases
The rule combination looks correct. To ensure comprehensive coverage:
- Add test cases for various empty password scenarios
- Include negative test cases to verify no false positives
✅ Verification successful
Test coverage is comprehensive and validates rule combination
The test file includes:
- Valid cases: non-empty passwords and environment variable usage
- Invalid cases: both direct empty string and variable-based empty string assignments
- Coverage for both patterns in the rule (match_call and match_call_with_string)
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Check if test files exist for this rule
fd -e yml "python-pymongo-empty-password.*test" tests/
Length of output: 115
Script:
#!/bin/bash
# Check the content of the test file to verify coverage
cat tests/python/python-pymongo-empty-password-python-test.yml
Length of output: 453
rules/python/security/python-pymongo-hardcoded-secret-python.yml (2)
1-14: LGTM: Clear security context and guidance
Well-structured metadata with appropriate:
- Severity level
- Security implications
- Mitigation strategies
- CWE/OWASP references
227-232: Consider optimizing pattern combinations
The current rule uses 4 patterns with some overlap in functionality. Consider:
- Consolidating common pattern elements
- Using more specific pattern matching to reduce false positives
Also verify the rule's effectiveness:
tests/__snapshots__/python-pymssql-empty-password-python-snapshot.yml (2)
1-281: LGTM! Comprehensive snapshot coverage
The snapshot file provides thorough coverage of the test cases with detailed AST matching labels.
1-281: Verify coverage of all possible empty password scenarios
Let's ensure we're catching all possible empty password scenarios in the codebase.
✅ Verification successful
Empty password detection implementation is comprehensive and accurate
The rule implementation effectively covers all three scenarios of empty password usage in pymssql connections:
- Direct empty string literals (
password='') - Empty string through
_mssql.connect - Variable-based empty strings (
pswd = "",password=pswd)
The test cases validate both positive and negative scenarios, including secure alternatives like environment variables and configuration retrieval. The implementation correctly identifies empty password vulnerabilities while allowing legitimate authentication methods.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Search for potential pymssql connection patterns that might be missed
echo "Checking for potential missed patterns..."
# Check for different empty string patterns
rg -U "password\s*=\s*['\"][\s]*['\"]" --type py
# Check for None password assignments
rg -U "password\s*=\s*None" --type py
# Check for variable assignments that might contain empty strings
ast-grep --pattern 'password = $X' -l python
# Check for potential connection strings or URLs that might contain empty passwords
rg -U "mssql(\+pymssql)?://[^:]+:@" --type py
Length of output: 729
Script:
#!/bin/bash
# Let's first check what Python files exist in the repository
fd '\.py$'
# Then let's check for any test files that might contain pymssql patterns
fd '\.py$' --exec grep -l "pymssql" {}
# Let's also check for any YAML files that might contain Python code snippets
fd '\.ya?ml$' --exec grep -l "pymssql" {}
# Check for any files containing password-related patterns
fd '.' --type f --exec grep -l "password" {}
Length of output: 940
Script:
#!/bin/bash
# Let's examine the rule file and test files to understand the coverage
echo "=== Rule Implementation ==="
cat ./rules/python/security/python-pymssql-empty-password-python.yml
echo -e "\n=== Test Cases ==="
cat ./tests/python/python-pymssql-empty-password-python-test.yml
# Let's also check if there are any other patterns in the test files
echo -e "\n=== Searching for additional password patterns in test files ==="
rg -p "password\s*[:=]" ./tests/python/python-pymssql-empty-password-python-test.yml
Length of output: 8404
Summary by CodeRabbit
Release Notes
New Features
pymongoandpymssqllibraries.Tests
pymongoandpymssql.Snapshots