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Fix signature validation #47

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Merged
merged 1 commit into from
Feb 5, 2025
Merged

Fix signature validation #47

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12 changes: 8 additions & 4 deletions rubberduckvba.Server/WebhookSignatureValidationService.cs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
using rubberduckvba.Server.Api.Admin;
using Newtonsoft.Json;
using rubberduckvba.Server.Api.Admin;
using System.Security.Cryptography;
using System.Text;

Expand Down Expand Up @@ -64,11 +65,14 @@ private bool IsValidSignature(string? signature, string payload)

var secret = configuration.GitHubOptions.Value.WebhookToken;
var secretBytes = Encoding.UTF8.GetBytes(secret);
var payloadbytes = Encoding.UTF8.GetBytes(payload);

var payloadBytes = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(JsonConvert.DeserializeObject(payload)));

using var digest = new HMACSHA256(secretBytes);
var check = $"sha256={Encoding.UTF8.GetString(digest.ComputeHash(payloadbytes))}";
var hash = digest.ComputeHash(payloadBytes);

var check = $"sha256={Convert.ToHexString(hash).ToLowerInvariant()}";

return signature == check;
return (signature == check);
}
}