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PowerShell secret masking (#1258)

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* Trim pwsh special chars when masking secrets

* Add pwsh valueEncoder

* Explain regex

* Update ValueEncoders.cs

* Add tests for pwsh color codes in secrets

* Formatting

* Group tests into theories

* Split secret on PS chars and mask for them

* Clean up comments

* Remove unused unittest

* Rename escape methods
This commit is contained in:
Ferenc Hammerl
2021-08-25 23:07:19 +02:00
committed by GitHub
parent 05b84297b7
commit 07c00f6a8a
3 changed files with 92 additions and 0 deletions
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2
src/Runner.Common/HostContext.cs
View File

@@ -90,6 +90,8 @@ namespace GitHub.Runner.Common
this.SecretMasker.AddValueEncoder(ValueEncoders.UriDataEscape);
this.SecretMasker.AddValueEncoder(ValueEncoders.XmlDataEscape);
this.SecretMasker.AddValueEncoder(ValueEncoders.TrimDoubleQuotes);
this.SecretMasker.AddValueEncoder(ValueEncoders.PowerShellPreAmpersandEscape);
this.SecretMasker.AddValueEncoder(ValueEncoders.PowerShellPostAmpersandEscape);
// Create the trace manager.
if (string.IsNullOrEmpty(logFile))

60
src/Sdk/DTLogging/Logging/ValueEncoders.cs
View File

@@ -2,6 +2,7 @@
using System.ComponentModel;
using System.Security;
using System.Text;
using System.Text.RegularExpressions;
using Newtonsoft.Json;
namespace GitHub.DistributedTask.Logging
@@ -80,6 +81,65 @@ namespace GitHub.DistributedTask.Logging
return trimmed;
}
public static String PowerShellPreAmpersandEscape(String value)
{
// if the secret is passed to PS as a command and it causes an error, sections of it can be surrounded by color codes
// or printed individually.
// The secret secretpart1&secretpart2&secretpart3 would be split into 2 sections:
// 'secretpart1&secretpart2&' and 'secretpart3'. This method masks for the first section.
// The secret secretpart1&+secretpart2&secretpart3 would be split into 2 sections:
// 'secretpart1&+' and (no 's') 'ecretpart2&secretpart3'. This method masks for the first section.
var trimmed = string.Empty;
if (!string.IsNullOrEmpty(value) && value.Contains("&"))
{
var secretSection = string.Empty;
if (value.Contains("&+"))
{
secretSection = value.Substring(0, value.IndexOf("&+") + "&+".Length);
}
else
{
secretSection = value.Substring(0, value.LastIndexOf("&") + "&".Length);
}
// Don't mask short secrets
if (secretSection.Length >= 6)
{
trimmed = secretSection;
}
}
return trimmed;
}
public static String PowerShellPostAmpersandEscape(String value)
{
var trimmed = string.Empty;
if (!string.IsNullOrEmpty(value) && value.Contains("&"))
{
var secretSection = string.Empty;
if (value.Contains("&+"))
{
// +1 to skip the letter that got colored
secretSection = value.Substring(value.IndexOf("&+") + "&+".Length + 1);
}
else
{
secretSection = value.Substring(value.LastIndexOf("&") + "&".Length);
}
if (secretSection.Length >= 6)
{
trimmed = secretSection;
}
}
return trimmed;
}
private static string Base64StringEscapeShift(String value, int shift)
{
var bytes = Encoding.UTF8.GetBytes(value);

30
src/Test/L0/HostContextL0.cs
View File

@@ -112,6 +112,36 @@ namespace GitHub.Runner.Common.Tests
}
}
[Theory]
[InlineData("secret&secret&secret", "secret&secret&\x0033[96msecret\x0033[0m", "***\x0033[96m***\x0033[0m")]
[InlineData("secret&secret+secret", "secret&\x0033[96msecret+secret\x0033[0m", "***\x0033[96m***\x0033[0m")]
[InlineData("secret+secret&secret", "secret+secret&\x0033[96msecret\x0033[0m", "***\x0033[96m***\x0033[0m")]
[InlineData("secret&secret&+secretsecret", "secret&secret&+\x0033[96ms\x0033[0mecretsecret", "***\x0033[96ms\x0033[0m***")]
[InlineData("secret&+secret&secret", "secret&+\x0033[96ms\x0033[0mecret&secret", "***\x0033[96ms\x0033[0m***")]
[InlineData("secret&+secret&+secret", "secret&+\x0033[96ms\x0033[0mecret&+secret", "***\x0033[96ms\x0033[0m***")]
[InlineData("secret&+secret&secret&+secret", "secret&+\x0033[96ms\x0033[0mecret&secret&+secret", "***\x0033[96ms\x0033[0m***")]
[Trait("Level", "L0")]
[Trait("Category", "Common")]
public void SecretSectionMasking(string secret, string rawOutput, string maskedOutput)
{
try
{
// Arrange.
Setup();
// Act.
_hc.SecretMasker.AddValue(secret);
// Assert.
Assert.Equal(maskedOutput, _hc.SecretMasker.MaskSecrets(rawOutput));
}
finally
{
// Cleanup.
Teardown();
}
}
[Fact]
[Trait("Level", "L0")]
[Trait("Category", "Common")]