Add AvoidUsingAllowUnencryptedAuthentication (#1857)

* Add AvoidUsingAllowUnencryptedAuthentication rule * Add AvoidUsingAllowUnencryptedAuthentication docs and tests * Update docs/Rules/AvoidUsingAllowUnencryptedAuthentication.md Co-authored-by: Christoph Bergmeister <c.bergmeister@gmail.com> * Fix code review suggestions * Fix md code styling * bump rule count in tests again * Update docs/Rules/AvoidUsingAllowUnencryptedAuthentication.md --------- Co-authored-by: Christoph Bergmeister <c.bergmeister@gmail.com> Co-authored-by: Christoph Bergmeister <c.bergmeister2@shell.com>
PowerShell · Feb 13, 2024 · c085ee3 · c085ee3
1 parent c06e005
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diff --git a/Rules/AvoidUsingAllowUnencryptedAuthentication.cs b/Rules/AvoidUsingAllowUnencryptedAuthentication.cs
@@ -0,0 +1,117 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Management.Automation.Language;
+using Microsoft.Windows.PowerShell.ScriptAnalyzer.Generic;
+#if !CORECLR
+using System.ComponentModel.Composition;
+#endif
+using System.Globalization;
+
+namespace Microsoft.Windows.PowerShell.ScriptAnalyzer.BuiltinRules
+{
+    /// <summary>
+    /// AvoidUsingAllowUnencryptedAuthentication: Avoid sending credentials and secrets over unencrypted connections.
+    /// </summary>
+#if !CORECLR
+[Export(typeof(IScriptRule))]
+#endif
+    public class AvoidUsingAllowUnencryptedAuthentication : AvoidParameterGeneric
+    {
+        /// <summary>
+        /// Condition on the cmdlet that must be satisfied for the error to be raised
+        /// </summary>
+        /// <param name="CmdAst"></param>
+        /// <returns></returns>
+        public override bool CommandCondition(CommandAst CmdAst)
+        {
+            return true;
+        }
+
+        /// <summary>
+        /// Condition on the parameter that must be satisfied for the error to be raised.
+        /// </summary>
+        /// <param name="CmdAst"></param>
+        /// <param name="CeAst"></param>
+        /// <returns></returns>
+        public override bool ParameterCondition(CommandAst CmdAst, CommandElementAst CeAst)
+        {
+            return CeAst is CommandParameterAst && String.Equals((CeAst as CommandParameterAst).ParameterName, "AllowUnencryptedAuthentication", StringComparison.OrdinalIgnoreCase);
+        }
+
+        /// <summary>
+        /// Retrieves the error message
+        /// </summary>
+        /// <param name="FileName"></param>
+        /// <param name="CmdAst"></param>
+        /// <returns></returns>
+        public override string GetError(string fileName, CommandAst cmdAst)
+        {
+            return String.Format(CultureInfo.CurrentCulture, Strings.AvoidUsingAllowUnencryptedAuthenticationError);
+        }
+
+        /// <summary>
+        /// GetName: Retrieves the name of this rule.
+        /// </summary>
+        /// <returns>The name of this rule</returns>
+        public override string GetName()
+        {
+            return string.Format(CultureInfo.CurrentCulture, Strings.NameSpaceFormat, GetSourceName(), Strings.AvoidUsingAllowUnencryptedAuthenticationName);
+        }
+
+        /// <summary>
+        /// GetCommonName: Retrieves the common name of this rule.
+        /// </summary>
+        /// <returns>The common name of this rule</returns>
+        public override string GetCommonName()
+        {
+            return string.Format(CultureInfo.CurrentCulture, Strings.AvoidUsingAllowUnencryptedAuthenticationCommonName);
+        }
+
+        /// <summary>
+        /// GetDescription: Retrieves the description of this rule.
+        /// </summary>
+        /// <returns>The description of this rule</returns>
+        public override string GetDescription()
+        {
+            return string.Format(CultureInfo.CurrentCulture, Strings.AvoidUsingAllowUnencryptedAuthenticationDescription);
+        }
+
+        /// <summary>
+        /// GetSourceType: Retrieves the type of the rule: builtin, managed or module.
+        /// </summary>
+        public override SourceType GetSourceType()
+        {
+            return SourceType.Builtin;
+        }
+
+        /// <summary>
+        /// GetSeverity: Retrieves the severity of the rule: error, warning or information.
+        /// </summary>
+        /// <returns></returns>
+        public override RuleSeverity GetSeverity()
+        {
+            return RuleSeverity.Warning;
+        }
+
+        /// <summary>
+        /// DiagnosticSeverity: Retrieves the severity of the rule of type DiagnosticSeverity: error, warning or information.
+        /// </summary>
+        /// <returns></returns>
+        public override DiagnosticSeverity GetDiagnosticSeverity()
+        {
+            return DiagnosticSeverity.Warning;
+        }
+
+        /// <summary>
+        /// GetSourceName: Retrieves the module/assembly name the rule is from.
+        /// </summary>
+        public override string GetSourceName()
+        {
+            return string.Format(CultureInfo.CurrentCulture, Strings.SourceName);
+        }
+    }
+}
diff --git a/Rules/Strings.resx b/Rules/Strings.resx
@@ -1206,4 +1206,16 @@
   <data name="AvoidExclaimOperatorCorrectionDescription" xml:space="preserve">
     <value>Replace ! with -not</value>
   </data>
+  <data name="AvoidUsingAllowUnencryptedAuthenticationCommonName" xml:space="preserve">
+    <value>Avoid AllowUnencryptedAuthentication Switch</value>
+  </data>
+  <data name="AvoidUsingAllowUnencryptedAuthenticationDescription" xml:space="preserve">
+    <value>Avoid sending credentials and secrets over unencrypted connections.</value>
+  </data>
+  <data name="AvoidUsingAllowUnencryptedAuthenticationError" xml:space="preserve">
+    <value>The insecure AllowUsingUnencryptedAuthentication switch was used. This should be avoided except for compatability with legacy systems.</value>
+  </data>
+  <data name="AvoidUsingAllowUnencryptedAuthenticationName" xml:space="preserve">
+    <value>AvoidUsingAllowUnencryptedAuthentication</value>
+  </data>
 </root>
diff --git a/Tests/Engine/GetScriptAnalyzerRule.tests.ps1 b/Tests/Engine/GetScriptAnalyzerRule.tests.ps1
@@ -63,7 +63,7 @@ Describe "Test Name parameters" {
 
         It "get Rules with no parameters supplied" {
             $defaultRules = Get-ScriptAnalyzerRule
-            $expectedNumRules = 69
+            $expectedNumRules = 70
             if ($PSVersionTable.PSVersion.Major -le 4)
             {
                 # for PSv3 PSAvoidGlobalAliases is not shipped because

diff --git a/Tests/Rules/AvoidUsingAllowUnencryptedAuthentication.tests.ps1 b/Tests/Rules/AvoidUsingAllowUnencryptedAuthentication.tests.ps1
@@ -0,0 +1,38 @@
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+BeforeAll {
+    $settings = @{
+        IncludeRules = @('PSAvoidUsingAllowUnencryptedAuthentication')
+        Rules        = @{
+            PSAvoidUsingAllowUnencryptedAuthentication = @{
+                Enable = $true
+            }
+        }
+    }
+}
+
+Describe "AvoidUsingAllowUnencryptedAuthentication" {
+    Context "When there are violations" {
+        It "detects unencrypted authentication violations" {
+            (Invoke-ScriptAnalyzer -ScriptDefinition 'Invoke-WebRequest foo -AllowUnencryptedAuthentication' -Settings $settings).Count | Should -Be 1
+            (Invoke-ScriptAnalyzer -ScriptDefinition 'Invoke-RestMethod foo -AllowUnencryptedAuthentication' -Settings $settings).Count | Should -Be 1
+            (Invoke-ScriptAnalyzer -ScriptDefinition 'iwr foo -AllowUnencryptedAuthentication' -Settings $settings).Count | Should -Be 1
+        }
+
+        It "detects arbitrary cmdlets" {
+            (Invoke-ScriptAnalyzer -ScriptDefinition 'Invoke-CustomWebRequest foo -AllowUnencryptedAuthentication' -Settings $settings).Count | Should -Be 1
+        }
+
+    }
+
+    Context "When there are no violations" {
+        It "does not flag safe usage" {
+            (Invoke-ScriptAnalyzer -ScriptDefinition 'Invoke-WebRequest foo' -Settings $settings).Count | Should -Be 0
+        }
+
+        It "does not flag cases with unrelated parameters" {
+            (Invoke-ScriptAnalyzer -ScriptDefinition 'Invoke-WebRequest foo -Method Get' -Settings $settings).Count | Should -Be 0
+        }
+    }
+}
diff --git a/docs/Rules/AvoidUsingAllowUnencryptedAuthentication.md b/docs/Rules/AvoidUsingAllowUnencryptedAuthentication.md
@@ -0,0 +1,35 @@
+---
+description: Avoid sending credentials and secrets over unencrypted connections
+ms.custom: PSSA v1.22.0
+ms.date: 11/06/2022
+ms.topic: reference
+title: AvoidUsingAllowUnencryptedAuthentication
+---
+# AvoidUsingAllowUnencryptedAuthentication
+
+**Severity Level: Warning**
+
+## Description
+
+Avoid using the `AllowUnencryptedAuthentication` switch on `Invoke-WebRequest`, `Invoke-RestMethod`, and other webrequest cmdlets, which sends credentials and secrets over unencrypted connections.
+This should be avoided except for compatability with legacy systems.
+
+For more details, see the documentation warning [here](https://learn.microsoft.com/powershell/module/microsoft.powershell.utility/invoke-webrequest#-allowunencryptedauthentication).
+
+## How
+
+Avoid using the `AllowUnencryptedAuthentication` switch.
+
+## Example 1
+
+### Wrong
+
+```powershell
+Invoke-WebRequest foo -AllowUnencryptedAuthentication
+```
+
+### Correct
+
+```powershell
+Invoke-WebRequest foo
+```
diff --git a/docs/Rules/README.md b/docs/Rules/README.md
@@ -27,6 +27,7 @@ The PSScriptAnalyzer contains the following rule definitions.
 | [AvoidSemicolonsAsLineTerminators](./AvoidSemicolonsAsLineTerminators.md)                         | Warning     |         No         |                 |
 | [AvoidShouldContinueWithoutForce](./AvoidShouldContinueWithoutForce.md)                           | Warning     |        Yes         |                 |
 | [AvoidTrailingWhitespace](./AvoidTrailingWhitespace.md)                                           | Warning     |        Yes         |                 |
+| [AvoidUsingAllowUnencryptedAuthentication](./AvoidUsingAllowUnencryptedAuthentication.md)         | Warning     |        Yes         |                 |
 | [AvoidUsingBrokenHashAlgorithms](./AvoidUsingBrokenHashAlgorithms.md)                             | Warning     |        Yes         |                 |
 | [AvoidUsingCmdletAliases](./AvoidUsingCmdletAliases.md)                                           | Warning     |        Yes         | Yes<sup>2</sup> |
 | [AvoidUsingComputerNameHardcoded](./AvoidUsingComputerNameHardcoded.md)                           | Error       |        Yes         |                 |