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Enhanced LogForgingQuery to treat C# Enums as simple types. #17866

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Enhanced LogForgingQuery to treat C# Enums as simple types. #17866

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1f21f72
Enhanced LogForgingQuery to treat C# Enums as simple types.
ianroof Sep 26, 2024
61f042e
Merge branch 'main' into ianroof/csharp-log-forging-query-enums
ianroof Oct 29, 2024
e9692cc
Merge branch 'main' into ianroof/csharp-log-forging-query-enums
ianroof Oct 29, 2024
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3 changes: 2 additions & 1 deletion csharp/ql/lib/semmle/code/csharp/security/Sanitizers.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,8 @@ class SimpleTypeSanitizedExpr extends DataFlow::ExprNode {
SimpleTypeSanitizedExpr() {
exists(Type t | t = this.getType() or t = this.getType().(NullableType).getUnderlyingType() |
t instanceof SimpleType or
t instanceof SystemDateTimeStruct
t instanceof SystemDateTimeStruct or
t instanceof Enum
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@hvitved : Do you know of any historical reason why we haven't considered enums as being sanitizers (I think it looks very reasonable that they should be considered sanitizers - but just checkin with you as this change has a wide impact)?

)
}
}
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4 changes: 4 additions & 0 deletions csharp/ql/src/change-notes/2024-09-18-csharp-log-forging-enum.md
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@@ -0,0 +1,4 @@
---
category: fix
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Suggested change
category: fix
category: minorAnalysis

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This is as such not a "fix" but rather a change in, how we perceive enums.

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That makes sense.

---
* Enhanced LogForgingQuery to treat C# Enums as simple types.
46 changes: 46 additions & 0 deletions csharp/ql/test/query-tests/Security Features/CWE-117/LogForgingSimpleTypes.cs
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using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Web;
using Microsoft.Extensions.Logging;

class ILogger
{
public void Warn(string message) { }
}

enum TestEnum
{
TestEnumValue
}

public class LogForgingSimpleTypes
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The test code doesn't compile. Consider adding the test code in https://github.com/github/codeql/blob/main/csharp/ql/test/query-tests/Security%20Features/CWE-117/LogForging.cs

Compilation issues:

  • Duplicate declaration of ILogger (as this class also exists in the file mentioned above).
  • Arguments to the Warn calls.

{
public void Execute(HttpContext ctx)
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The test cases doesn't test the simple type sanitization as the input to the logger are hardcoded constants and not a data flow source for the log forging query (maybe use the same pattern as in https://github.com/github/codeql/blob/main/csharp/ql/test/query-tests/Security%20Features/CWE-117/LogForging.cs)

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Interestingly, I have seen hardcoded Enums trigger this, but I will address this to use a true data flow source.

{
// GOOD: int
logger.Warn("Logging simple type (int):" 1);
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Did you intend to concatenate? "Logging simple type (int):" + 1


// GOOD: long
logger.Warn("Logging simple type (int):" 1L);

// GOOD: float
logger.Warn("Logging simple type (float):" 1.1);

// GOOD: double
logger.Warn("Logging simple type (double):" 1.1d);

// GOOD: decimal
logger.Warn("Logging simple type (double):" 1.1m);

// GOOD: Enum
logger.Warn("Logging simple type (Enum):" TestEnum.TestEnumVAlue);

// GOOD: DateTime
logger.Warn("Logging simple type (int):" new DateTime());

// GOOD: DateTimeOffset
logger.Warn("Logging simple type (int):" DateTimeOffset.UtcNow);
}
}
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