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FIX: [CodeQL: SM02184] Server certificate validation disabled in VssUtil.cs #5068

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FIX: [CodeQL: SM02184] Server certificate validation disabled in VssUtil.cs #5068

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b0597f4
Changing the callback checking for custom certificate validation
MantavyaDh Dec 19, 2024
ac20c16
Adding Unit Test and Comments
MantavyaDh Dec 24, 2024
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3 changes: 2 additions & 1 deletion src/Agent.Sdk/Util/VssUtil.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
using System.Collections.Generic;
using System.Globalization;
using System.Net.Http;
using System.Net.Security;
using Microsoft.TeamFoundation.DistributedTask.WebApi;
using Microsoft.VisualStudio.Services.Common;
using Microsoft.VisualStudio.Services.WebApi;
Expand Down Expand Up @@ -167,7 +168,7 @@ private static bool CheckSupportOfCustomServerCertificateValidation(ITraceWriter
{
using (var handler = new HttpClientHandler())
{
handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; };
handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return errors == SslPolicyErrors.None; };
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I suspect this is equivalent to not handling the event at all. I agree with the concerns about the impact on self-signed certificates with this change.

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It may be good to add a clarifying comment specifically that we set ServerCertificateCustomValidationCallback only to check to see if GetAsync throws an exception when ServerCertificateCustomValidationCallback - the body of the handler doesn't matter.

not blocking


using (var client = new HttpClient(handler))
{
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