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MJVLbergmeisterChristoph Bergmeister
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Add AvoidUsingAllowUnencryptedAuthentication (#1857)
* Add AvoidUsingAllowUnencryptedAuthentication rule * Add AvoidUsingAllowUnencryptedAuthentication docs and tests * Update docs/Rules/AvoidUsingAllowUnencryptedAuthentication.md Co-authored-by: Christoph Bergmeister <[email protected]> * Fix code review suggestions * Fix md code styling * bump rule count in tests again * Update docs/Rules/AvoidUsingAllowUnencryptedAuthentication.md --------- Co-authored-by: Christoph Bergmeister <[email protected]> Co-authored-by: Christoph Bergmeister <[email protected]>
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‎Rules/AvoidUsingAllowUnencryptedAuthentication.cs‎

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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Management.Automation.Language;
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using Microsoft.Windows.PowerShell.ScriptAnalyzer.Generic;
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#if !CORECLR
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using System.ComponentModel.Composition;
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#endif
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using System.Globalization;
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namespace Microsoft.Windows.PowerShell.ScriptAnalyzer.BuiltinRules
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{
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/// <summary>
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/// AvoidUsingAllowUnencryptedAuthentication: Avoid sending credentials and secrets over unencrypted connections.
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/// </summary>
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#if !CORECLR
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[Export(typeof(IScriptRule))]
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#endif
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public class AvoidUsingAllowUnencryptedAuthentication : AvoidParameterGeneric
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{
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/// <summary>
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/// Condition on the cmdlet that must be satisfied for the error to be raised
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/// </summary>
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/// <param name="CmdAst"></param>
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/// <returns></returns>
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public override bool CommandCondition(CommandAst CmdAst)
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{
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return true;
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}
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/// <summary>
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/// Condition on the parameter that must be satisfied for the error to be raised.
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/// </summary>
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/// <param name="CmdAst"></param>
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/// <param name="CeAst"></param>
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/// <returns></returns>
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public override bool ParameterCondition(CommandAst CmdAst, CommandElementAst CeAst)
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{
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return CeAst is CommandParameterAst && String.Equals((CeAst as CommandParameterAst).ParameterName, "AllowUnencryptedAuthentication", StringComparison.OrdinalIgnoreCase);
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}
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/// <summary>
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/// Retrieves the error message
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/// </summary>
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/// <param name="FileName"></param>
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/// <param name="CmdAst"></param>
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/// <returns></returns>
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public override string GetError(string fileName, CommandAst cmdAst)
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{
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return String.Format(CultureInfo.CurrentCulture, Strings.AvoidUsingAllowUnencryptedAuthenticationError);
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}
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/// <summary>
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/// GetName: Retrieves the name of this rule.
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/// </summary>
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/// <returns>The name of this rule</returns>
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public override string GetName()
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{
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return string.Format(CultureInfo.CurrentCulture, Strings.NameSpaceFormat, GetSourceName(), Strings.AvoidUsingAllowUnencryptedAuthenticationName);
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}
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/// <summary>
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/// GetCommonName: Retrieves the common name of this rule.
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/// </summary>
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/// <returns>The common name of this rule</returns>
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public override string GetCommonName()
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{
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return string.Format(CultureInfo.CurrentCulture, Strings.AvoidUsingAllowUnencryptedAuthenticationCommonName);
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}
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/// <summary>
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/// GetDescription: Retrieves the description of this rule.
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/// </summary>
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/// <returns>The description of this rule</returns>
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public override string GetDescription()
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{
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return string.Format(CultureInfo.CurrentCulture, Strings.AvoidUsingAllowUnencryptedAuthenticationDescription);
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}
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/// <summary>
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/// GetSourceType: Retrieves the type of the rule: builtin, managed or module.
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/// </summary>
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public override SourceType GetSourceType()
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{
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return SourceType.Builtin;
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}
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/// <summary>
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/// GetSeverity: Retrieves the severity of the rule: error, warning or information.
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/// </summary>
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/// <returns></returns>
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public override RuleSeverity GetSeverity()
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{
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return RuleSeverity.Warning;
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}
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/// <summary>
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/// DiagnosticSeverity: Retrieves the severity of the rule of type DiagnosticSeverity: error, warning or information.
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/// </summary>
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/// <returns></returns>
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public override DiagnosticSeverity GetDiagnosticSeverity()
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{
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return DiagnosticSeverity.Warning;
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}
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/// <summary>
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/// GetSourceName: Retrieves the module/assembly name the rule is from.
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/// </summary>
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public override string GetSourceName()
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{
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return string.Format(CultureInfo.CurrentCulture, Strings.SourceName);
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}
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}
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}

‎Rules/Strings.resx‎

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<data name="AvoidExclaimOperatorCorrectionDescription" xml:space="preserve">
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<value>Replace ! with -not</value>
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</data>
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<data name="AvoidUsingAllowUnencryptedAuthenticationCommonName" xml:space="preserve">
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<value>Avoid AllowUnencryptedAuthentication Switch</value>
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</data>
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<data name="AvoidUsingAllowUnencryptedAuthenticationDescription" xml:space="preserve">
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<value>Avoid sending credentials and secrets over unencrypted connections.</value>
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</data>
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<data name="AvoidUsingAllowUnencryptedAuthenticationError" xml:space="preserve">
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<value>The insecure AllowUsingUnencryptedAuthentication switch was used. This should be avoided except for compatability with legacy systems.</value>
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</data>
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<data name="AvoidUsingAllowUnencryptedAuthenticationName" xml:space="preserve">
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<value>AvoidUsingAllowUnencryptedAuthentication</value>
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</data>
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</root>

‎Tests/Engine/GetScriptAnalyzerRule.tests.ps1‎

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It "get Rules with no parameters supplied" {
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$defaultRules = Get-ScriptAnalyzerRule
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$expectedNumRules = 69
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$expectedNumRules = 70
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if ($PSVersionTable.PSVersion.Major -le 4)
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{
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# for PSv3 PSAvoidGlobalAliases is not shipped because

‎Tests/Rules/AvoidUsingAllowUnencryptedAuthentication.tests.ps1‎

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# Copyright (c) Microsoft Corporation. All rights reserved.
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# Licensed under the MIT License.
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BeforeAll {
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$settings = @{
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IncludeRules = @('PSAvoidUsingAllowUnencryptedAuthentication')
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Rules = @{
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PSAvoidUsingAllowUnencryptedAuthentication = @{
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Enable = $true
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}
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}
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}
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}
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Describe "AvoidUsingAllowUnencryptedAuthentication" {
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Context "When there are violations" {
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It "detects unencrypted authentication violations" {
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(Invoke-ScriptAnalyzer -ScriptDefinition 'Invoke-WebRequest foo -AllowUnencryptedAuthentication' -Settings $settings).Count | Should -Be 1
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(Invoke-ScriptAnalyzer -ScriptDefinition 'Invoke-RestMethod foo -AllowUnencryptedAuthentication' -Settings $settings).Count | Should -Be 1
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(Invoke-ScriptAnalyzer -ScriptDefinition 'iwr foo -AllowUnencryptedAuthentication' -Settings $settings).Count | Should -Be 1
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}
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It "detects arbitrary cmdlets" {
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(Invoke-ScriptAnalyzer -ScriptDefinition 'Invoke-CustomWebRequest foo -AllowUnencryptedAuthentication' -Settings $settings).Count | Should -Be 1
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}
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}
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Context "When there are no violations" {
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It "does not flag safe usage" {
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(Invoke-ScriptAnalyzer -ScriptDefinition 'Invoke-WebRequest foo' -Settings $settings).Count | Should -Be 0
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}
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It "does not flag cases with unrelated parameters" {
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(Invoke-ScriptAnalyzer -ScriptDefinition 'Invoke-WebRequest foo -Method Get' -Settings $settings).Count | Should -Be 0
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}
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}
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}

‎docs/Rules/AvoidUsingAllowUnencryptedAuthentication.md‎

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---
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description: Avoid sending credentials and secrets over unencrypted connections
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ms.custom: PSSA v1.22.0
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ms.date: 11/06/2022
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ms.topic: reference
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title: AvoidUsingAllowUnencryptedAuthentication
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---
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# AvoidUsingAllowUnencryptedAuthentication
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**Severity Level: Warning**
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## Description
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Avoid using the `AllowUnencryptedAuthentication` switch on `Invoke-WebRequest`, `Invoke-RestMethod`, and other webrequest cmdlets, which sends credentials and secrets over unencrypted connections.
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This should be avoided except for compatability with legacy systems.
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For more details, see the documentation warning [here](https://learn.microsoft.com/powershell/module/microsoft.powershell.utility/invoke-webrequest#-allowunencryptedauthentication).
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## How
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Avoid using the `AllowUnencryptedAuthentication` switch.
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## Example 1
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### Wrong
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```powershell
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Invoke-WebRequest foo -AllowUnencryptedAuthentication
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```
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### Correct
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```powershell
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Invoke-WebRequest foo
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```

‎docs/Rules/README.md‎

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| [AvoidSemicolonsAsLineTerminators](./AvoidSemicolonsAsLineTerminators.md) | Warning | No | |
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| [AvoidShouldContinueWithoutForce](./AvoidShouldContinueWithoutForce.md) | Warning | Yes | |
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| [AvoidTrailingWhitespace](./AvoidTrailingWhitespace.md) | Warning | Yes | |
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| [AvoidUsingAllowUnencryptedAuthentication](./AvoidUsingAllowUnencryptedAuthentication.md) | Warning | Yes | |
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| [AvoidUsingBrokenHashAlgorithms](./AvoidUsingBrokenHashAlgorithms.md) | Warning | Yes | |
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| [AvoidUsingCmdletAliases](./AvoidUsingCmdletAliases.md) | Warning | Yes | Yes<sup>2</sup> |
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| [AvoidUsingComputerNameHardcoded](./AvoidUsingComputerNameHardcoded.md) | Error | Yes | |

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