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Python: Remove old points-to modeling file

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Since all of this was ported already
This commit is contained in:
Rasmus Wriedt Larsen
2023-08-28 10:40:45 +02:00
parent 39e2b133e9
commit 0dca8a5d86
1 changed files with 0 additions and 121 deletions
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121
python/ql/src/experimental/semmle/python/security/injection/XSLT.qll
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@@ -1,121 +0,0 @@
/**
* Provides class and predicates to track external data that
* may represent malicious XSLT query objects.
*
* This module is intended to be imported into a taint-tracking query
* to extend `TaintKind` and `TaintSink`.
*/
import python
import semmle.python.dataflow.TaintTracking
import semmle.python.web.HttpRequest
/** Models XSLT Injection related classes and functions */
module XsltInjection {
/** Returns a class value which refers to `lxml.etree` */
Value etree() { result = Value::named("lxml.etree") }
/** A generic taint sink that is vulnerable to XSLT injection. */
abstract class XsltInjectionSink extends TaintSink { }
/** DEPRECATED: Alias for XsltInjectionSink */
deprecated class XSLTInjectionSink = XsltInjectionSink;
/**
* A kind of "taint", representing an untrusted XML string
*/
deprecated private class ExternalXmlStringKind extends ExternalStringKind {
ExternalXmlStringKind() { this = "etree.XML string" }
override TaintKind getTaintForFlowStep(ControlFlowNode fromnode, ControlFlowNode tonode) {
etreeXml(fromnode, tonode) and result instanceof ExternalXmlKind
or
etreeFromStringList(fromnode, tonode) and result instanceof ExternalXmlKind
or
etreeFromString(fromnode, tonode) and result instanceof ExternalXmlKind
}
}
/**
* A kind of "taint", representing a XML encoded string
*/
class ExternalXmlKind extends TaintKind {
ExternalXmlKind() { this = "lxml etree xml" }
}
private predicate etreeXml(ControlFlowNode fromnode, CallNode tonode) {
// etree.XML("<xmlContent>")
exists(CallNode call | call.getFunction().(AttrNode).getObject("XML").pointsTo(etree()) |
call.getArg(0) = fromnode and
call = tonode
)
}
private predicate etreeFromString(ControlFlowNode fromnode, CallNode tonode) {
// etree.fromstring(text, parser=None)
exists(CallNode call | call.getFunction().(AttrNode).getObject("fromstring").pointsTo(etree()) |
call.getArg(0) = fromnode and
call = tonode
)
}
private predicate etreeFromStringList(ControlFlowNode fromnode, CallNode tonode) {
// etree.fromstringlist(strings, parser=None)
exists(CallNode call |
call.getFunction().(AttrNode).getObject("fromstringlist").pointsTo(etree())
|
call.getArg(0) = fromnode and
call = tonode
)
}
/**
* A Sink representing an argument to the `etree.XSLT` call.
*
* from lxml import etree
* root = etree.XML("<xmlContent>")
* find_text = etree.XSLT("`sink`")
*/
private class EtreeXsltArgument extends XsltInjectionSink {
override string toString() { result = "lxml.etree.XSLT" }
EtreeXsltArgument() {
exists(CallNode call | call.getFunction().(AttrNode).getObject("XSLT").pointsTo(etree()) |
call.getArg(0) = this
)
}
override predicate sinks(TaintKind kind) { kind instanceof ExternalXmlKind }
}
/**
* A Sink representing an argument to the `XSLT` call to a parsed xml document.
*
* from lxml import etree
* from io import StringIO
* `sink` = etree.XML(xsltQuery)
* tree = etree.parse(f)
* result_tree = tree.xslt(`sink`)
*/
private class ParseXsltArgument extends XsltInjectionSink {
override string toString() { result = "lxml.etree.parse.xslt" }
ParseXsltArgument() {
exists(
CallNode parseCall, CallNode xsltCall, ControlFlowNode obj, Variable var, AssignStmt assign
|
parseCall.getFunction().(AttrNode).getObject("parse").pointsTo(etree()) and
assign.getValue().(Call).getAFlowNode() = parseCall and
xsltCall.getFunction().(AttrNode).getObject("xslt") = obj and
var.getAUse() = obj and
assign.getATarget() = var.getAStore() and
xsltCall.getArg(0) = this
)
}
override predicate sinks(TaintKind kind) { kind instanceof ExternalXmlKind }
}
}
/** DEPRECATED: Alias for XsltInjection */
deprecated module XSLTInjection = XsltInjection;