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atorralbaatorralba
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Added query for Cleartext Storage in Android Database
1 parent 117795c commit f0604e2

26 files changed

Lines changed: 611 additions & 10 deletions

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

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@@ -132,6 +132,8 @@ private module Frameworks {
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private import semmle.code.java.frameworks.Hibernate
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private import semmle.code.java.frameworks.jOOQ
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private import semmle.code.java.frameworks.spring.SpringHttp
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private import semmle.code.java.frameworks.android.ContentProviders
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private import semmle.code.java.frameworks.android.Widget
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}
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private predicate sourceModelCsv(string row) {

‎java/ql/lib/semmle/code/java/frameworks/android/ContentProviders.qll‎

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/**
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* Provides classes and predicates for working with Content Providers.
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*/
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import java
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import semmle.code.java.dataflow.ExternalFlow
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/** The class `android.content.ContentValues`. */
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class ContentValues extends Class {
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ContentValues() { this.hasQualifiedName("android.content", "ContentValues") }
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}
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private class SummaryModels extends SummaryModelCsv {
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override predicate row(string row) {
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row =
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[
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"android.content;ContentValues;false;put;;;Argument[0];MapKey of Argument[-1];value",
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"android.content;ContentValues;false;put;;;Argument[1];MapValue of Argument[-1];value",
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"android.content;ContentValues;false;putAll;;;MapKey of Argument[0];MapKey of Argument[-1];value",
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"android.content;ContentValues;false;putAll;;;MapValue of Argument[0];MapValue of Argument[-1];value"
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]
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}
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}

‎java/ql/lib/semmle/code/java/frameworks/android/SQLite.qll‎

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@@ -24,6 +24,14 @@ class TypeDatabaseUtils extends Class {
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TypeDatabaseUtils() { hasQualifiedName("android.database", "DatabaseUtils") }
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}
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class TypeSQLiteOpenHelper extends Class {
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TypeSQLiteOpenHelper() { this.hasQualifiedName("android.database.sqlite", "SQLiteOpenHelper") }
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}
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class TypeSQLiteStatement extends Class {
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TypeSQLiteStatement() { this.hasQualifiedName("android.database.sqlite", "SQLiteStatement") }
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}
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private class SQLiteSinkCsv extends SinkModelCsv {
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override predicate row(string row) {
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row =

‎java/ql/lib/semmle/code/java/frameworks/android/Widget.qll‎

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import java
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import semmle.code.java.dataflow.ExternalFlow
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import semmle.code.java.dataflow.FlowSources
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private class AndroidWidgetSourceModels extends SourceModelCsv {
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override predicate row(string row) {
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row = ["android.widget;EditText;true;getText;;;ReturnValue;android-widget"]
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}
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}
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private class DefaultAndroidWidgetSources extends RemoteFlowSource {
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DefaultAndroidWidgetSources() { sourceNode(this, "android-widget") }
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override string getSourceType() { result = "Android widget source" }
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}
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private class AndroidWidgetSummaryModels extends SummaryModelCsv {
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override predicate row(string row) {
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row = ["android.widget;EditText;true;getText;;;Argument[-1];ReturnValue;taint"]
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}
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}

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

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/** Provides classes and predicates to reason about cleartext storage in Android databases. */
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import java
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import semmle.code.java.dataflow.DataFlow
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import semmle.code.java.frameworks.android.ContentProviders
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import semmle.code.java.frameworks.android.Intent
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import semmle.code.java.frameworks.android.SQLite
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import semmle.code.java.security.CleartextStorageQuery
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private class LocalDatabaseCleartextStorageSink extends CleartextStorageSink {
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LocalDatabaseCleartextStorageSink() { localDatabaseInput(_, this.asExpr()) }
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}
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private class LocalDatabaseCleartextStorageStep extends CleartextStorageAdditionalTaintStep {
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override predicate step(DataFlow::Node n1, DataFlow::Node n2) {
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// EditText.getText() return type is parsed as `Object`, so we need to
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// add a taint step for `Object.toString` to model `editText.getText().toString()`
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exists(MethodAccess ma, Method m |
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ma.getMethod() = m and
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m.getDeclaringType() instanceof TypeObject and
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m.hasName("toString")
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|
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n1.asExpr() = ma.getQualifier() and n2.asExpr() = ma
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)
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}
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}
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/** The creation of an object that can be used to store data in a local database. */
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class LocalDatabaseOpenMethodAccess extends Storable, Call {
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LocalDatabaseOpenMethodAccess() {
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exists(Method m | this.(MethodAccess).getMethod() = m |
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m.getDeclaringType().getASupertype*() instanceof TypeSQLiteOpenHelper and
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m.hasName("getWritableDatabase")
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or
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m.getDeclaringType() instanceof TypeSQLiteDatabase and
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m.hasName(["create", "open%Database", "compileStatement"])
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or
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m.getDeclaringType().getASupertype*() instanceof TypeContext and
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m.hasName("openOrCreateDatabase")
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)
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or
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this.(ClassInstanceExpr).getConstructedType() instanceof ContentValues
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}
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override Expr getAnInput() {
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exists(LocalDatabaseFlowConfig config, DataFlow::Node database |
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localDatabaseInput(database, result) and
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config.hasFlow(DataFlow::exprNode(this), database)
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)
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}
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override Expr getAStore() {
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exists(LocalDatabaseFlowConfig config, DataFlow::Node database |
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localDatabaseStore(database, result) and
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config.hasFlow(DataFlow::exprNode(this), database)
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)
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}
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}
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/** A method that is both a database input and a database store. */
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private class LocalDatabaseInputStoreMethod extends Method {
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LocalDatabaseInputStoreMethod() {
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this.getDeclaringType() instanceof TypeSQLiteDatabase and
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this.getName().matches("exec%SQL")
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}
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}
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private predicate localDatabaseInput(DataFlow::Node database, Argument input) {
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exists(Method m | input.getCall().(MethodAccess).getMethod() = m |
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m instanceof LocalDatabaseInputStoreMethod and
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database.asExpr() = input.getCall().getQualifier()
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or
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m.getDeclaringType() instanceof TypeSQLiteDatabase and
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m.hasName("compileStatement") and
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database.asExpr() = input.getCall()
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or
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m.getDeclaringType() instanceof ContentValues and
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m.hasName("put") and
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input.getPosition() = 1 and
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database.asExpr() = input.getCall().getQualifier()
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)
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}
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private predicate localDatabaseStore(DataFlow::Node database, MethodAccess store) {
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exists(Method m | store.getMethod() = m |
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m instanceof LocalDatabaseInputStoreMethod and
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database.asExpr() = store.getQualifier()
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or
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m.getDeclaringType() instanceof TypeSQLiteDatabase and
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m.getName().matches(["insert%", "replace%", "update%"]) and
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database.asExpr() = store.getAnArgument() and
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database.getType() instanceof ContentValues
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or
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m.getDeclaringType() instanceof TypeSQLiteStatement and
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m.hasName(["executeInsert", "executeUpdateDelete"]) and
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database.asExpr() = store.getQualifier()
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)
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}
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private class LocalDatabaseFlowConfig extends DataFlow::Configuration {
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LocalDatabaseFlowConfig() { this = "LocalDatabaseFlowConfig" }
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override predicate isSource(DataFlow::Node source) {
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source.asExpr() instanceof LocalDatabaseOpenMethodAccess
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}
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override predicate isSink(DataFlow::Node sink) {
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localDatabaseInput(sink, _) or
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localDatabaseStore(sink, _)
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}
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override predicate isAdditionalFlowStep(DataFlow::Node n1, DataFlow::Node n2) {
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exists(Field f |
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f.getType() instanceof TypeSQLiteDatabase and
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f.getAnAssignedValue() = n1.asExpr() and
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f = n2.asExpr().(FieldRead).getField()
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)
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}
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}

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

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import java
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private string suspicious() {
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result = ["%password%", "%passwd%", "%account%", "%accnt%", "%trusted%"]
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result =
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[
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"%password%", "%passwd%", "pwd", "%account%", "%accnt%", "%trusted%", "%refresh%token%",
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"%secret%token"
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]
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}
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private string nonSuspicious() {
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result = "%hashed%" or
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result = "%encrypted%" or
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result = "%crypt%"
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result = "%crypt%" or
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result = "%create table%" or
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result = "%drop table%"
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}
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/**

‎java/ql/src/Security/CWE/CWE-312/CleartextStorageAndroidDatabase.java‎

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public void sqliteStorageUnsafe(Context ctx, String name, String password) {
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// BAD - sensitive information saved in cleartext.
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SQLiteDatabase db = ctx.openOrCreateDatabase("test", Context.MODE_PRIVATE, null);
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db.execSQL("INSERT INTO users VALUES (?, ?)", new String[] {name, password});
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}
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public void sqliteStorageSafe(Context ctx, String name, String password) {
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// GOOD - sensitive information encrypted with a custom method.
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SQLiteDatabase db = ctx.openOrCreateDatabase("test", Context.MODE_PRIVATE, null);
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db.execSQL("INSERT INTO users VALUES (?, ?)", new String[] {name, encrypt(password)});
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}
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public void sqlCipherStorageSafe(String name, String password, String databasePassword) {
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// GOOD - sensitive information saved using SQLCipher.
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net.sqlcipher.database.SQLiteDatabase db =
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net.sqlcipher.database.SQLiteDatabase.openOrCreateDatabase("test", databasePassword, null);
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db.execSQL("INSERT INTO users VALUES (?, ?)", new String[] {name, password});
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}

‎java/ql/src/Security/CWE/CWE-312/CleartextStorageAndroidDatabase.qhelp‎

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<!DOCTYPE qhelp PUBLIC "-//Semmle//qhelp//EN" "qhelp.dtd">
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<qhelp>
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<overview>
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<p>
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SQLite is a lightweight database engine commonly used in Android devices to store data. By itself, SQLite does not offer any encryption mechanism by default and stores all data in plaintext, which introduces a risk if sensitive data like credentials, authentication tokens or personal identifiable information (PII) are directly stored in a SQLite database. The information could be accessed by any process or user in rooted devices, or can be disclosed through chained vulnerabilities, like unexpected access to the private storage through exposed components.
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</p>
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</overview>
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<recommendation>
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<p>
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Use <code>SQLCipher</code> or similar libraries to add encryption capabilities to SQLite. Alternatively, encrypt sensitive data using cryptographicaly secure algorithms before storing it in the database.
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</p>
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</recommendation>
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<example>
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<p>
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In the first example, sensitive user information is stored in cleartext.
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</p>
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<p>
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In the second and third examples, the code encrypts sensitive information before saving it to the database.
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</p>
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<sample src="CleartextStorageAndroidDatabase.java" />
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</example>
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<references>
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<li>
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Android Developers:
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<a href="https://developer.android.com/topic/security/data">Work with data more securely</a>
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</li>
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<li>
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SQLCipher:
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<a href="https://www.zetetic.net/sqlcipher/sqlcipher-for-android/">Android Application Integration</a>
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</li>
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</references>
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</qhelp>

‎java/ql/src/Security/CWE/CWE-312/CleartextStorageAndroidDatabase.ql‎

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/**
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* @name Cleartext storage of sensitive information using a local database on Android
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* @description Cleartext Storage of Sensitive Information using
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* a local database on Android allows access for users with root
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* privileges or unexpected exposure from chained vulnerabilities.
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* @kind problem
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* @problem.severity warning
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* @precision medium
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* @id java/android/cleartext-storage-database
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* @tags security
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* external/cwe/cwe-312
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*/
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import java
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import semmle.code.java.security.CleartextStorageAndroidDatabaseQuery
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from SensitiveSource data, LocalDatabaseOpenMethodAccess s, Expr input, Expr store
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where
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input = s.getAnInput() and
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store = s.getAStore() and
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data.flowsToCached(input)
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select store, "SQLite database $@ containing $@ is stored $@. Data was added $@.", s, s.toString(),
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data, "sensitive data", store, "here", input, "here"

‎java/ql/src/change-notes/2021-08-17-cleartext-storage-database-query.md‎

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---
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category: newQuery
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---
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* A new query "Cleartext storage of sensitive information using a local database on Android" (`java/android/cleartext-storage-database`) has been added. This query finds instances of sensitive data being stored in local databases without encryption, which may expose it to attackers or malicious applications.

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