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Load macOS Key Vault certs as Exportable only so private key survives… #5259

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Merged
DrewScoggins merged 1 commit into from
Jul 10, 2026
Merged

Load macOS Key Vault certs as Exportable only so private key survives… #5259

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13 changes: 11 additions & 2 deletions src/tools/CertHelper/KeyVaultCert.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
Expand Down Expand Up @@ -149,10 +150,18 @@ private async Task<X509Certificate2> FindCertificateInKeyVaultAsync(string certN
throw new Exception("Certificate secret not found in Key Vault");
}
var certBytes = Convert.FromBase64String(secret.Value.Value);

// On macOS, PersistKeySet imports the private key into the login Keychain, which then cannot
// export the private key back out (the same limitation the file-backed store works around).
// That produces public-only PFX exports (roughly half the expected size). Load the key as
// Exportable only so it stays in memory and can be exported to the file-backed store.
var storageFlags = RuntimeInformation.IsOSPlatform(OSPlatform.OSX)
? X509KeyStorageFlags.Exportable
: X509KeyStorageFlags.Exportable | X509KeyStorageFlags.PersistKeySet;
#if NET9_0_OR_GREATER
var cert = X509CertificateLoader.LoadPkcs12(certBytes, "", X509KeyStorageFlags.Exportable | X509KeyStorageFlags.PersistKeySet);
var cert = X509CertificateLoader.LoadPkcs12(certBytes, "", storageFlags);
#else
var cert = new X509Certificate2(certBytes, "", X509KeyStorageFlags.Exportable | X509KeyStorageFlags.PersistKeySet);
var cert = new X509Certificate2(certBytes, "", storageFlags);
#endif
return cert;
}
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