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Merge pull request #12932 from atorralba/atorralba/java/promote-xxe-experimental-sinks
Java: Promote experimental XXE sinks
2 parents cc36e3c + 770099f commit 1b06bf1

37 files changed

Lines changed: 584 additions & 1194 deletions

‎java/ql/lib/semmle/code/java/dataflow/RangeUtils.qll‎

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@@ -104,6 +104,17 @@ private predicate constantBooleanExpr(Expr e, boolean val) {
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CalcConstants::calculateBooleanValue(e) = val
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}
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pragma[nomagic]
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private predicate constantStringExpr(Expr e, string val) {
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e.(CompileTimeConstantExpr).getStringValue() = val
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or
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exists(SsaExplicitUpdate v, Expr src |
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e = v.getAUse() and
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src = v.getDefiningExpr().(VariableAssign).getSource() and
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constantStringExpr(src, val)
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)
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}
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private boolean getBoolValue(Expr e) { constantBooleanExpr(e, result) }
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private int getIntValue(Expr e) { constantIntegerExpr(e, result) }
@@ -126,6 +137,14 @@ class ConstantBooleanExpr extends Expr {
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boolean getBooleanValue() { constantBooleanExpr(this, result) }
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}
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/** An expression that always has the same string value. */
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class ConstantStringExpr extends Expr {
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ConstantStringExpr() { constantStringExpr(this, _) }
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/** Get the string value of this expression. */
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string getStringValue() { constantStringExpr(this, result) }
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}
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/**
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* Gets an expression that equals `v - d`.
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*/

‎java/ql/lib/semmle/code/java/frameworks/apache/CommonsXml.qll‎

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/** Provides XML definitions related to the `org.apache.commons` package. */
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import java
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private import semmle.code.java.dataflow.RangeUtils
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private import semmle.code.java.security.XmlParsers
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/**
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* The classes `org.apache.commons.digester3.Digester`, `org.apache.commons.digester.Digester` or `org.apache.tomcat.util.digester.Digester`.
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*/
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private class Digester extends RefType {
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Digester() {
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this.hasQualifiedName([
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"org.apache.commons.digester3", "org.apache.commons.digester",
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"org.apache.tomcat.util.digester"
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], "Digester")
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}
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}
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/** A call to `Digester.parse`. */
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private class DigesterParse extends XmlParserCall {
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DigesterParse() {
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exists(Method m |
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this.getMethod() = m and
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m.getDeclaringType() instanceof Digester and
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m.hasName("parse")
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)
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}
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override Expr getSink() { result = this.getArgument(0) }
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override predicate isSafe() { SafeDigesterFlow::flowToExpr(this.getQualifier()) }
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}
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/** A `ParserConfig` that is specific to `Digester`. */
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private class DigesterConfig extends ParserConfig {
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DigesterConfig() {
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exists(Method m |
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m = this.getMethod() and
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m.getDeclaringType() instanceof Digester and
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m.hasName("setFeature")
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)
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}
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}
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/**
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* A safely configured `Digester`.
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*/
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private class SafeDigester extends VarAccess {
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SafeDigester() {
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exists(Variable v | v = this.getVariable() |
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exists(DigesterConfig config | config.getQualifier() = v.getAnAccess() |
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config.enables(singleSafeConfig())
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)
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or
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exists(DigesterConfig config | config.getQualifier() = v.getAnAccess() |
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config
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.disables(any(ConstantStringExpr s |
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s.getStringValue() = "http://xml.org/sax/features/external-general-entities"
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))
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) and
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exists(DigesterConfig config | config.getQualifier() = v.getAnAccess() |
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config
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.disables(any(ConstantStringExpr s |
64+
s.getStringValue() = "http://xml.org/sax/features/external-parameter-entities"
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))
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) and
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exists(DigesterConfig config | config.getQualifier() = v.getAnAccess() |
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config
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.disables(any(ConstantStringExpr s |
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s.getStringValue() =
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"http://apache.org/xml/features/nonvalidating/load-external-dtd"
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))
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)
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)
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}
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}
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private module SafeDigesterFlowConfig implements DataFlow::ConfigSig {
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predicate isSource(DataFlow::Node src) { src.asExpr() instanceof SafeDigester }
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predicate isSink(DataFlow::Node sink) {
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exists(MethodAccess ma |
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sink.asExpr() = ma.getQualifier() and ma.getMethod().getDeclaringType() instanceof Digester
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)
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}
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int fieldFlowBranchLimit() { result = 0 }
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}
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private module SafeDigesterFlow = DataFlow::Global<SafeDigesterFlowConfig>;

‎java/ql/lib/semmle/code/java/frameworks/javaee/Xml.qll‎

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/** Provides definitions related to the `javax.xml` package. */
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import java
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private import semmle.code.java.security.XmlParsers
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/** A call to `Validator.validate`. */
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private class ValidatorValidate extends XmlParserCall {
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ValidatorValidate() {
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exists(Method m |
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this.getMethod() = m and
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m.getDeclaringType() instanceof Validator and
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m.hasName("validate")
13+
)
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}
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override Expr getSink() { result = this.getArgument(0) }
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override predicate isSafe() { SafeValidatorFlow::flowToExpr(this.getQualifier()) }
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}
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/** A `TransformerConfig` specific to `Validator`. */
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private class ValidatorConfig extends TransformerConfig {
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ValidatorConfig() {
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exists(Method m |
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this.getMethod() = m and
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m.getDeclaringType() instanceof Validator and
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m.hasName("setProperty")
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)
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}
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}
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/** The class `javax.xml.validation.Validator`. */
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private class Validator extends RefType {
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Validator() { this.hasQualifiedName("javax.xml.validation", "Validator") }
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}
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/** A safely configured `Validator`. */
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private class SafeValidator extends VarAccess {
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SafeValidator() {
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exists(Variable v | v = this.getVariable() |
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exists(ValidatorConfig config | config.getQualifier() = v.getAnAccess() |
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config.disables(configAccessExternalDtd())
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) and
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exists(ValidatorConfig config | config.getQualifier() = v.getAnAccess() |
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config.disables(configAccessExternalSchema())
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)
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)
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}
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}
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private module SafeValidatorFlowConfig implements DataFlow::ConfigSig {
52+
predicate isSource(DataFlow::Node src) { src.asExpr() instanceof SafeValidator }
53+
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predicate isSink(DataFlow::Node sink) {
55+
exists(MethodAccess ma |
56+
sink.asExpr() = ma.getQualifier() and
57+
ma.getMethod().getDeclaringType() instanceof Validator
58+
)
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}
60+
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int fieldFlowBranchLimit() { result = 0 }
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}
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private module SafeValidatorFlow = DataFlow::Global<SafeValidatorFlowConfig>;

‎java/ql/lib/semmle/code/java/frameworks/javase/Beans.qll‎

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@@ -0,0 +1,24 @@
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/** Provides definitions related to the `java.beans` package. */
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3+
import java
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private import semmle.code.java.security.XmlParsers
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/** The class `java.beans.XMLDecoder`. */
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private class XmlDecoder extends RefType {
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XmlDecoder() { this.hasQualifiedName("java.beans", "XMLDecoder") }
9+
}
10+
11+
/** A call to `XMLDecoder.readObject`. */
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private class XmlDecoderReadObject extends XmlParserCall {
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XmlDecoderReadObject() {
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exists(Method m |
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this.getMethod() = m and
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m.getDeclaringType() instanceof XmlDecoder and
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m.hasName("readObject")
18+
)
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}
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override Expr getSink() { result = this.getQualifier() }
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override predicate isSafe() { none() }
24+
}

‎java/ql/lib/semmle/code/java/frameworks/rundeck/RundeckXml.qll‎

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@@ -0,0 +1,19 @@
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/** Provides definitions related to XML parsing in Rundeck. */
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3+
import java
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private import semmle.code.java.security.XmlParsers
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/** A call to `ParserHelper.loadDocument`. */
7+
private class ParserHelperLoadDocument extends XmlParserCall {
8+
ParserHelperLoadDocument() {
9+
exists(Method m |
10+
this.getMethod() = m and
11+
m.getDeclaringType().hasQualifiedName("org.rundeck.api.parser", "ParserHelper") and
12+
m.hasName("loadDocument")
13+
)
14+
}
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16+
override Expr getSink() { result = this.getArgument(0) }
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override predicate isSafe() { none() }
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}

‎java/ql/lib/semmle/code/java/security/XmlParsers.qll‎

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@@ -2,15 +2,15 @@
22

33
import java
44
import semmle.code.java.dataflow.DataFlow
5-
import semmle.code.java.dataflow.DataFlow2
65
import semmle.code.java.dataflow.DataFlow3
7-
import semmle.code.java.dataflow.DataFlow4
8-
import semmle.code.java.dataflow.DataFlow5
9-
private import semmle.code.java.dataflow.SSA
6+
private import semmle.code.java.dataflow.RangeUtils
107

11-
/*
12-
* Various XML parsers in Java.
13-
*/
8+
private module Frameworks {
9+
private import semmle.code.java.frameworks.apache.CommonsXml
10+
private import semmle.code.java.frameworks.javaee.Xml
11+
private import semmle.code.java.frameworks.javase.Beans
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private import semmle.code.java.frameworks.rundeck.RundeckXml
13+
}
1414

1515
/**
1616
* An abstract type representing a call to parse XML files.
@@ -130,26 +130,6 @@ class DocumentBuilderFactoryConfig extends ParserConfig {
130130
}
131131
}
132132

133-
private predicate constantStringExpr(Expr e, string val) {
134-
e.(CompileTimeConstantExpr).getStringValue() = val
135-
or
136-
exists(SsaExplicitUpdate v, Expr src |
137-
e = v.getAUse() and
138-
src = v.getDefiningExpr().(VariableAssign).getSource() and
139-
constantStringExpr(src, val)
140-
)
141-
}
142-
143-
/** An expression that always has the same string value. */
144-
private class ConstantStringExpr extends Expr {
145-
string value;
146-
147-
ConstantStringExpr() { constantStringExpr(this, value) }
148-
149-
/** Get the string value of this expression. */
150-
string getStringValue() { result = value }
151-
}
152-
153133
/**
154134
* A general configuration that is safe when enabled.
155135
*/
@@ -973,7 +953,7 @@ class TransformerFactorySource extends XmlParserCall {
973953
exists(Method m |
974954
this.getMethod() = m and
975955
m.getDeclaringType() instanceof TransformerFactory and
976-
m.hasName("newTransformer")
956+
m.hasName(["newTransformer", "newTransformerHandler"])
977957
)
978958
}
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‎java/ql/src/change-notes/2023-04-26-xxe-sinks-promotion.md‎

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---
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category: minorAnalysis
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---
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* Experimental sinks for the query "Resolving XML external entity in user-controlled data" (`java/xxe`) have been promoted to the main query pack. These sinks were originally [submitted as part of an experimental query by @haby0](https://github.com/github/codeql/pull/6564).

‎java/ql/src/experimental/Security/CWE/CWE-611/XXE.java‎

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