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libxml2-audit-parser-cpp.yml
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id: libxml2-audit-parser-cpp
language: Cpp
severity: warning
message: >-
The libxml2 library is used to parse XML. When auditing such code, make
sure that either the document being parsed is trusted or that the parsing
options are safe to consume untrusted documents. In such case make sure
DTD or XInclude documents cannot be loaded and there is no network access.
note: >-
[CWE-611] Improper Restriction of XML External Entity Reference.
[REFERENCES]
- https://owasp.org/Top10/A05_2021-Security_Misconfiguration
ast-grep-essentials: true
utils:
Pattern_having_three_child:
kind: call_expression
all:
- has:
kind: identifier
regex: ^(xmlReadFile)$
- has:
kind: argument_list
all:
- has:
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
nthChild:
position: 3
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 4
ofRule:
not:
kind: comment
Pattern_having_five_child:
kind: call_expression
all:
- has:
kind: identifier
regex: ^(xmlParseInNodeContext|xmlReadMemory|xmlCtxtReadDoc|xmlCtxtReadFd)$
- has:
kind: argument_list
all:
- has:
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
nthChild:
position: 3
ofRule:
not:
kind: comment
- has:
nthChild:
position: 4
ofRule:
not:
kind: comment
- has:
nthChild:
position: 5
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 6
ofRule:
not:
kind: comment
Pattern_having_four_child:
kind: call_expression
all:
- has:
kind: identifier
regex: ^(xmlReadDoc|xmlReadFd|xmlCtxtReadFile)$
- has:
kind: argument_list
all:
- has:
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
nthChild:
position: 3
ofRule:
not:
kind: comment
- has:
nthChild:
position: 4
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 5
ofRule:
not:
kind: comment
Pattern_having_six_child:
kind: call_expression
all:
- has:
kind: identifier
regex: ^(xmlReadIO|xmlCtxtReadMemory)$
- has:
kind: argument_list
all:
- has:
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
nthChild:
position: 3
ofRule:
not:
kind: comment
- has:
nthChild:
position: 4
ofRule:
not:
kind: comment
- has:
nthChild:
position: 5
ofRule:
not:
kind: comment
- has:
nthChild:
position: 6
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 7
ofRule:
not:
kind: comment
Pattern_having_seven_child:
kind: call_expression
all:
- has:
kind: identifier
regex: ^(xmlCtxtReadIO)$
- has:
kind: argument_list
all:
- has:
nthChild:
position: 1
ofRule:
not:
kind: comment
- has:
nthChild:
position: 2
ofRule:
not:
kind: comment
- has:
nthChild:
position: 3
ofRule:
not:
kind: comment
- has:
nthChild:
position: 4
ofRule:
not:
kind: comment
- has:
nthChild:
position: 5
ofRule:
not:
kind: comment
- has:
nthChild:
position: 6
ofRule:
not:
kind: comment
- has:
nthChild:
position: 7
ofRule:
not:
kind: comment
- not:
has:
nthChild:
position: 8
ofRule:
not:
kind: comment
rule:
kind: call_expression
any:
- matches: Pattern_having_five_child
- matches: Pattern_having_four_child
- matches: Pattern_having_six_child
- matches: Pattern_having_seven_child
- matches: Pattern_having_three_child
not:
all:
- has:
stopBy: end
kind: ERROR
- inside:
stopBy: end
kind: ERROR