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Merge pull request #800 from calumgrant/cs/winforms
C#: Add sources from System.Windows.Forms controls
2 parents 23e94c2 + 790db3a commit 338754f

22 files changed

Lines changed: 256 additions & 14 deletions

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‎change-notes/1.20/analysis-csharp.md‎

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@@ -14,7 +14,8 @@
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| Off-by-one comparison against container length (cs/index-out-of-bounds) | Fewer false positives | Results have been removed when there are additional guards on the index. |
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| Dereferenced variable is always null (cs/dereferenced-value-is-always-null) | Improved results | The query has been rewritten from scratch, and the analysis is now based on static single assignment (SSA) forms. The query is now enabled by default in LGTM. |
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| Dereferenced variable may be null (cs/dereferenced-value-may-be-null) | Improved results | The query has been rewritten from scratch, and the analysis is now based on static single assignment (SSA) forms. The query is now enabled by default in LGTM. |
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| SQL query built from user-controlled sources (cs/sql-injection), Improper control of generation of code (cs/code-injection), Uncontrolled format string (cs/uncontrolled-format-string), Clear text storage of sensitive information (cs/cleartext-storage-of-sensitive-information), Exposure of private information (cs/exposure-of-sensitive-information) | More results | Data sources have been added from user controls in `System.Windows.Forms`. |
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## Changes to code extraction
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* Fix extraction of `for` statements where the condition declares new variables using `is`.

‎csharp/ql/src/Security Features/CWE-089/SqlInjection.ql‎

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@@ -14,7 +14,13 @@ import csharp
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import semmle.code.csharp.security.dataflow.SqlInjection::SqlInjection
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import semmle.code.csharp.dataflow.DataFlow::DataFlow::PathGraph
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string getSourceType(DataFlow::Node node) {
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result = node.(RemoteFlowSource).getSourceType()
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or
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result = node.(LocalFlowSource).getSourceType()
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}
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from TaintTrackingConfiguration c, DataFlow::PathNode source, DataFlow::PathNode sink
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where c.hasFlowPath(source, sink)
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select sink.getNode(), source, sink, "Query might include code from $@.", source,
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("this " + source.getNode().(RemoteFlowSource).getSourceType())
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("this " + getSourceType(source.getNode()))

‎csharp/ql/src/Security Features/CWE-134/UncontrolledFormatString.ql‎

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@@ -12,14 +12,19 @@
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import csharp
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import semmle.code.csharp.dataflow.flowsources.Remote
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import semmle.code.csharp.dataflow.flowsources.Local
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import semmle.code.csharp.dataflow.TaintTracking
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import semmle.code.csharp.frameworks.Format
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import DataFlow::PathGraph
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class FormatStringConfiguration extends TaintTracking::Configuration {
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FormatStringConfiguration() { this = "FormatStringConfiguration" }
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override predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }
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override predicate isSource(DataFlow::Node source) {
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source instanceof RemoteFlowSource
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or
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source instanceof LocalFlowSource
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}
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override predicate isSink(DataFlow::Node sink) {
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sink.asExpr() = any(FormatCall call).getFormatExpr()

‎csharp/ql/src/semmle/code/csharp/dataflow/flowsources/Local.qll‎

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@@ -0,0 +1,22 @@
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/**
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* Provides classes representing sources of local input.
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*/
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import csharp
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private import semmle.code.csharp.frameworks.system.windows.Forms
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/** A data flow source of local data. */
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abstract class LocalFlowSource extends DataFlow::Node {
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/** Gets a string that describes the type of this local flow source. */
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abstract string getSourceType();
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}
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/** A data flow source of local user input. */
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abstract class LocalUserInputSource extends LocalFlowSource { }
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/** The text of a `TextBox`. */
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class TextFieldSource extends LocalUserInputSource {
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TextFieldSource() { this.asExpr() = any(TextControl control).getARead() }
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override string getSourceType() { result = "TextBox text" }
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}

‎csharp/ql/src/semmle/code/csharp/frameworks/system/windows/Forms.qll‎

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@@ -23,3 +23,66 @@ class SystemWindowsFormsHtmlElement extends SystemWindowsFormsClass {
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/** Gets the `SetAttribute` method. */
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Method getSetAttributeMethod() { result = this.getAMethod("SetAttribute") }
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}
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/** The `System.Windows.Forms.TextBoxBase` class. */
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class SystemWindowsFormsTextBoxBase extends SystemWindowsFormsClass {
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SystemWindowsFormsTextBoxBase() { this.hasName("TextBoxBase") }
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/** Gets the `Text` property. */
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Property getTextProperty() { result = this.getProperty("Text") }
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}
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/** The `System.Windows.Forms.RichTextBox` class. */
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class SystemWindowsFormsRichTextBox extends SystemWindowsFormsClass {
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SystemWindowsFormsRichTextBox() { this.hasName("RichTextBox") }
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/** Gets the `Rtf` property. */
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Property getRtfProperty() { result = this.getProperty("Rtf") }
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/** Gets the `SelectedText` property. */
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Property getSelectedTextProperty() { result = this.getProperty("SelectedText") }
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/** Gets the 'SelectedRtf' property. */
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Property getSelectedRtfProperty() { result = this.getProperty("SelectedRtf") }
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}
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/** The `System.Windows.Forms.HtmlDocument` class. */
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class SystemWindowsFormsHtmlDocumentClass extends SystemWindowsFormsClass {
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SystemWindowsFormsHtmlDocumentClass() { this.hasName("HtmlDocument") }
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/** Gets the `Write` method. */
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Method getWriteMethod() { result = this.getAMethod("Write") }
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}
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/** The `System.Windows.Forms.WebBrowser` class. */
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class SystemWindowsFormsWebBrowserClass extends SystemWindowsFormsClass {
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SystemWindowsFormsWebBrowserClass() { this.hasName("WebBrowser") }
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/** Gets the `DocumentText` property. */
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Property getDocumentTextProperty() { result = this.getProperty("DocumentText") }
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}
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private class TextProperty extends Property {
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TextProperty() {
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exists(SystemWindowsFormsRichTextBox c |
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this = c.getRtfProperty() or
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this = c.getSelectedTextProperty() or
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this = c.getSelectedRtfProperty()
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)
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or
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exists(SystemWindowsFormsTextBoxBase tb | this = tb.getTextProperty().getAnOverrider*())
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}
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}
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/** A variable that contains a text control. */
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class TextControl extends Variable {
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TextControl() {
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this.getType().(ValueOrRefType).getBaseClass*() instanceof SystemWindowsFormsTextBoxBase
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}
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/** Gets a read of the text property. */
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PropertyRead getARead() {
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result.getTarget() instanceof TextProperty and
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result.getQualifier() = this.getAnAccess()
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}
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}

‎csharp/ql/src/semmle/code/csharp/security/PrivateData.qll‎

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*/
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import csharp
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import semmle.code.csharp.frameworks.system.windows.Forms
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/** A string for `match` that identifies strings that look like they represent private data. */
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private string privateNames() {
@@ -58,3 +59,10 @@ class PrivateVariableAccess extends PrivateDataExpr, VariableAccess {
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exists(string s | this.getTarget().getName().toLowerCase() = s | s.matches(privateNames()))
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}
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}
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/** Reading the text property of a control that might contain private data. */
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class PrivateControlAccess extends PrivateDataExpr {
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PrivateControlAccess() {
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exists(TextControl c | this = c.getARead() and c.getName().toLowerCase().matches(privateNames()))
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}
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}

‎csharp/ql/src/semmle/code/csharp/security/SensitiveActions.qll‎

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*/
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import csharp
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import semmle.code.csharp.frameworks.system.windows.Forms
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/**
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* A string for `match` that identifies strings that look like they represent secret data.
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/** An expression that may contain a password. */
110111
class PasswordExpr extends Expr {
111-
PasswordExpr() { exists(string name | expressionHasName(this, name) and isPassword(name)) }
112+
PasswordExpr() {
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exists(string name | expressionHasName(this, name) and isPassword(name))
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or
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this instanceof PasswordTextboxText
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}
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}
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/** An expression that might contain sensitive data. */
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SensitiveVariableAccess() { isSuspicious(this.getTarget().getName()) }
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}
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/** Reading the `Text` property of a password text box. */
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class PasswordTextboxText extends SensitiveExpr, PropertyRead {
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PasswordTextboxText() { this = any(PasswordField p).getARead() }
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}
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/** A field containing a text box used as a password. */
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class PasswordField extends TextControl {
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PasswordField() {
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isSuspicious(this.getName())
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or
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exists(PropertyWrite write | write.getQualifier() = this.getAnAccess() |
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write.getTarget().getName() = "UseSystemPasswordChar" or
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write.getTarget().getName() = "PasswordChar"
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)
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}
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}
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/** A method that may produce sensitive data. */
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abstract class SensitiveDataMethod extends Method { }
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‎csharp/ql/src/semmle/code/csharp/security/dataflow/CodeInjection.qll‎

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module CodeInjection {
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import semmle.code.csharp.dataflow.flowsources.Remote
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import semmle.code.csharp.dataflow.flowsources.Local
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import semmle.code.csharp.frameworks.system.codedom.Compiler
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import semmle.code.csharp.security.Sanitizers
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/** A source of remote user input. */
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class RemoteSource extends Source { RemoteSource() { this instanceof RemoteFlowSource } }
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/** A source of local user input. */
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class LocalSource extends Source { LocalSource() { this instanceof LocalFlowSource } }
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private class SimpleTypeSanitizer extends Sanitizer, SimpleTypeSanitizedExpr { }
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private class GuidSanitizer extends Sanitizer, GuidSanitizedExpr { }

‎csharp/ql/src/semmle/code/csharp/security/dataflow/ResourceInjection.qll‎

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module ResourceInjection {
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import semmle.code.csharp.dataflow.flowsources.Remote
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import semmle.code.csharp.dataflow.flowsources.Local
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import semmle.code.csharp.frameworks.system.Data
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import semmle.code.csharp.security.Sanitizers
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@@ -40,6 +41,9 @@ module ResourceInjection {
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/** A source of remote user input. */
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class RemoteSource extends Source { RemoteSource() { this instanceof RemoteFlowSource } }
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/** A source of local user input. */
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class LocalSource extends Source { LocalSource() { this instanceof LocalFlowSource } }
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/** An argument to the `ConnectionString` property on a data connection class. */
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class SqlConnectionStringSink extends Sink {
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SqlConnectionStringSink() {

‎csharp/ql/src/semmle/code/csharp/security/dataflow/SqlInjection.qll‎

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module SqlInjection {
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import semmle.code.csharp.dataflow.flowsources.Remote
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import semmle.code.csharp.dataflow.flowsources.Local
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import semmle.code.csharp.frameworks.Sql
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import semmle.code.csharp.security.Sanitizers
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/** A source of remote user input. */
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class RemoteSource extends Source { RemoteSource() { this instanceof RemoteFlowSource } }
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/** A source of local user input. */
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class LocalSource extends Source { LocalSource() { this instanceof LocalFlowSource } }
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/** An SQL expression passed to an API call that executes SQL. */
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class SqlInjectionExprSink extends Sink {
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SqlInjectionExprSink() { exists(SqlExpr s | this.getExpr() = s.getSql()) }

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