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tls-uses-pqc: use already-loaded libssl instead #429

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Merged
omajid merged 1 commit into from
Jul 21, 2026
Merged

tls-uses-pqc: use already-loaded libssl instead #429

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20 changes: 16 additions & 4 deletions tls-uses-pqc/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -59,22 +59,34 @@
// Use OpenSSL interop to get the negotiated key exchange group (SslStream doesn't expose this information).
static void SetOpenSSLImportResolver()
{
// Use the latest OpenSSL version on the system.
NativeLibrary.SetDllImportResolver(Assembly.GetExecutingAssembly(), (name, assembly, searchPath) =>
{
Console.WriteLine($"Resolving {name}...");

if (name == "libssl")
{
if (NativeLibrary.TryLoad("libssl.so.4", assembly, searchPath, out var h) ||
NativeLibrary.TryLoad("libssl.so.3", assembly, searchPath, out h))
// The runtime can pick a libssl version based on the build
// configuration (portable vs non-portable) and/or version-priority
// and/or user-overrides. Instead of hardcoding or guessing, find
// the version of libssl.so already loaded into the current
// process. By the time this runs, we have already used TLS
// operations like SslStream(), so some version of libssl must be
// already loaded on *nix.
var procSelfMaps = File.ReadAllText("/proc/self/maps");
var libsslPath = procSelfMaps.Split(new string[]{ Environment.NewLine }, StringSplitOptions.None)
.Select(line => line.Split(' ').LastOrDefault()?.Trim())
.FirstOrDefault(path => !string.IsNullOrEmpty(path) && path.Contains("libssl.so"));

if (!string.IsNullOrEmpty(libsslPath) &&
NativeLibrary.TryLoad(libsslPath, assembly, searchPath, out var h))
{
return h;
}

Console.WriteLine($"error: Cannot resolve {name}.");
Console.WriteLine();
Console.WriteLine("Mapped files:");
Console.WriteLine(File.ReadAllText("/proc/self/maps"));
Console.WriteLine(procSelfMaps);
Console.WriteLine();
Console.WriteLine("libssl files in /usr/lib*:");
try
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