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familienarchiv/.semgrep/security.yml
Marcel 669eaa7c65
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fix(ci): pin semgrep version, add pip cache, harden rule severity
- Pin semgrep to 1.163.0 to prevent silent upgrades breaking the scan
- Add cache: 'pip' to setup-python@v5 for faster CI runs
- Promote all three XXE Semgrep rules from WARNING to ERROR to match
  the --error CI flag intent
- Update SAX/StAX rule messages to reference XxeSafeXmlParser and
  the OWASP XXE prevention cheat sheet
- Remove stale issue reference from regression test comment
- Document XML metacharacter constraint on buildValidOds test helper

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-17 16:18:03 +02:00

55 lines
2.3 KiB
YAML

# Semgrep security rules for Familienarchiv backend.
# These rules catch the absence of XXE protection on XML parser factories.
# CWE-611: Improper Restriction of XML External Entity Reference.
# Run: semgrep --config .semgrep/security.yml --error backend/src/
rules:
# DocumentBuilderFactory without XXE hardening.
# All call sites must call setFeature("…disallow-doctype-decl", true) before use.
- id: dbf-xxe-default
patterns:
- pattern: $X = DocumentBuilderFactory.newInstance();
- pattern-not-inside: |
...
$X.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
...
message: >
DocumentBuilderFactory without XXE protection (CWE-611).
Call XxeSafeXmlParser.hardenedFactory() instead of DocumentBuilderFactory.newInstance().
See: https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html
languages: [java]
severity: ERROR
# SAXParserFactory without XXE hardening.
- id: sax-xxe-default
patterns:
- pattern: $X = SAXParserFactory.newInstance();
- pattern-not-inside: |
...
$X.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
...
message: >
SAXParserFactory without XXE protection (CWE-611).
Set disallow-doctype-decl=true, external-general-entities=false, external-parameter-entities=false,
and load-external-dtd=false before use. Follow the pattern in XxeSafeXmlParser.hardenedFactory().
See: https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html
languages: [java]
severity: ERROR
# XMLInputFactory without XXE hardening (StAX parser).
- id: stax-xxe-default
patterns:
- pattern: $X = XMLInputFactory.newInstance();
- pattern-not-inside: |
...
$X.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
...
message: >
XMLInputFactory without XXE protection (CWE-611).
Set IS_SUPPORTING_EXTERNAL_ENTITIES=false and SUPPORT_DTD=false before use.
Follow the pattern in XxeSafeXmlParser.hardenedFactory().
See: https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html
languages: [java]
severity: ERROR