linux-packaging-mono/mcs/class/System/Mono.Btls/MonoBtlsSslCtx.cs

//
// MonoBtlsSslCtx.cs
//
// Author:
//       Martin Baulig <martin.baulig@xamarin.com>
//
// Copyright (c) 2016 Xamarin Inc. (http://www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#if SECURITY_DEP && MONO_FEATURE_BTLS
using System;
using System.Security.Cryptography.X509Certificates;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace Mono.Btls
{
	class MonoBtlsSslCtx : MonoBtlsObject
	{
		internal class BoringSslCtxHandle : MonoBtlsHandle
		{
			public BoringSslCtxHandle (IntPtr handle)
				: base (handle, true)
			{
			}

			protected override bool ReleaseHandle ()
			{
				mono_btls_ssl_ctx_free (handle);
				return true;
			}
		}

		new internal BoringSslCtxHandle Handle {
			get { return (BoringSslCtxHandle)base.Handle; }
		}

		[DllImport (BTLS_DYLIB)]
		extern static IntPtr mono_btls_ssl_ctx_new ();

		[DllImport (BTLS_DYLIB)]
		extern static int mono_btls_ssl_ctx_free (IntPtr handle);

		[DllImport (BTLS_DYLIB)]
		extern static IntPtr mono_btls_ssl_ctx_up_ref (IntPtr handle);

		[DllImport (BTLS_DYLIB)]
		extern static void mono_btls_ssl_ctx_initialize (IntPtr handle, IntPtr instance);

		[DllImport (BTLS_DYLIB)]
		extern static void mono_btls_ssl_ctx_set_debug_bio (IntPtr handle, IntPtr bio);

		[DllImport (BTLS_DYLIB)]
		extern static void mono_btls_ssl_ctx_set_cert_verify_callback (IntPtr handle, IntPtr func, int cert_required);

		[DllImport (BTLS_DYLIB)]
		extern static void mono_btls_ssl_ctx_set_cert_select_callback (IntPtr handle, IntPtr func);

		[DllImport (BTLS_DYLIB)]
		extern static void mono_btls_ssl_ctx_set_min_version (IntPtr handle, int version);

		[DllImport (BTLS_DYLIB)]
		extern static void mono_btls_ssl_ctx_set_max_version (IntPtr handle, int version);

		[DllImport (BTLS_DYLIB)]
		extern static int mono_btls_ssl_ctx_is_cipher_supported (IntPtr handle, short value);

		[DllImport (BTLS_DYLIB)]
		extern static int mono_btls_ssl_ctx_set_ciphers (IntPtr handle, int count, IntPtr data, int allow_unsupported);

		[DllImport (BTLS_DYLIB)]
		extern static int mono_btls_ssl_ctx_set_verify_param (IntPtr handle, IntPtr param);

		[DllImport (BTLS_DYLIB)]
		extern static int mono_btls_ssl_ctx_set_client_ca_list (IntPtr handle, int count, IntPtr sizes, IntPtr data);

		delegate int NativeVerifyFunc (IntPtr instance, int preverify_ok, IntPtr ctx);
		delegate int NativeSelectFunc (IntPtr instance, int count, IntPtr sizes, IntPtr data);

		NativeVerifyFunc verifyFunc;
		NativeSelectFunc selectFunc;
		IntPtr verifyFuncPtr;
		IntPtr selectFuncPtr;
		MonoBtlsVerifyCallback verifyCallback;
		MonoBtlsSelectCallback selectCallback;
		MonoBtlsX509Store store;
		GCHandle instance;
		IntPtr instancePtr;

		public MonoBtlsSslCtx ()
			: this (new BoringSslCtxHandle (mono_btls_ssl_ctx_new ()))
		{
		}

		internal MonoBtlsSslCtx (BoringSslCtxHandle handle)
			: base (handle)
		{
			instance = GCHandle.Alloc (this);
			instancePtr = GCHandle.ToIntPtr (instance);
			mono_btls_ssl_ctx_initialize (
				handle.DangerousGetHandle (), instancePtr);

			verifyFunc = NativeVerifyCallback;
			selectFunc = NativeSelectCallback;
			verifyFuncPtr = Marshal.GetFunctionPointerForDelegate (verifyFunc);
			selectFuncPtr = Marshal.GetFunctionPointerForDelegate (selectFunc);

			store = new MonoBtlsX509Store (Handle);
		}

		internal MonoBtlsSslCtx Copy ()
		{
			var copy = mono_btls_ssl_ctx_up_ref (Handle.DangerousGetHandle ());
			return new MonoBtlsSslCtx (new BoringSslCtxHandle (copy));
		}

		public MonoBtlsX509Store CertificateStore {
			get { return store; }
		}

		int VerifyCallback (bool preverify_ok, MonoBtlsX509StoreCtx ctx)
		{
			if (verifyCallback != null)
				return verifyCallback (ctx);
			return 0;
		}

		[Mono.Util.MonoPInvokeCallback (typeof (NativeVerifyFunc))]
		static int NativeVerifyCallback (IntPtr instance, int preverify_ok, IntPtr store_ctx)
		{
			var c = (MonoBtlsSslCtx)GCHandle.FromIntPtr (instance).Target;
			using (var ctx = new MonoBtlsX509StoreCtx (preverify_ok, store_ctx)) {
				try {
					return c.VerifyCallback (preverify_ok != 0, ctx);
				} catch (Exception ex) {
					c.SetException (ex);
				}
			}
			return 0;
		}

		[Mono.Util.MonoPInvokeCallback (typeof (NativeSelectFunc))]
		static int NativeSelectCallback (IntPtr instance, int count, IntPtr sizes, IntPtr data)
		{
			var c = (MonoBtlsSslCtx)GCHandle.FromIntPtr (instance).Target;
			try {
				var acceptableIssuers = CopyIssuers (count, sizes, data);
				if (c.selectCallback != null)
					return c.selectCallback (acceptableIssuers);
				return 1;
			} catch (Exception ex) {
				c.SetException (ex);
				return 0;
			}
		}

		static string[] CopyIssuers (int count, IntPtr sizesPtr, IntPtr dataPtr)
		{
			if (count == 0 || sizesPtr == IntPtr.Zero || dataPtr == IntPtr.Zero)
				return null;
			var sizes = new int [count];
			Marshal.Copy (sizesPtr, sizes, 0, count);
			var data = new IntPtr [count];
			Marshal.Copy (dataPtr, data, 0, count);

			var issuers = new string [count];

			for (int i = 0; i < count; i++) {
				var buffer = new byte [sizes [i]];
				Marshal.Copy (data[i], buffer, 0, buffer.Length);
				using (var xname = MonoBtlsX509Name.CreateFromData (buffer, false))
					issuers[i] = MonoBtlsUtils.FormatName (xname, true, ", ", true);
			}

			return issuers;
		}

		public void SetDebugBio (MonoBtlsBio bio)
		{
			CheckThrow ();
			mono_btls_ssl_ctx_set_debug_bio (Handle.DangerousGetHandle (), bio.Handle.DangerousGetHandle ());
		}

		public void SetVerifyCallback (MonoBtlsVerifyCallback callback, bool client_cert_required)
		{
			CheckThrow ();

			verifyCallback = callback;
			mono_btls_ssl_ctx_set_cert_verify_callback (
				Handle.DangerousGetHandle (), verifyFuncPtr,
				client_cert_required ? 1 : 0);
		}

		public void SetSelectCallback (MonoBtlsSelectCallback callback)
		{
			CheckThrow ();

			selectCallback = callback;
			mono_btls_ssl_ctx_set_cert_select_callback (
				Handle.DangerousGetHandle (), selectFuncPtr);
		}

		public void SetMinVersion (int version)
		{
			CheckThrow ();
			mono_btls_ssl_ctx_set_min_version (Handle.DangerousGetHandle (), version);
		}

		public void SetMaxVersion (int version)
		{
			CheckThrow ();
			mono_btls_ssl_ctx_set_max_version (Handle.DangerousGetHandle (), version);
		}

		public bool IsCipherSupported (short value)
		{
			CheckThrow ();
			return mono_btls_ssl_ctx_is_cipher_supported (Handle.DangerousGetHandle (), value) != 0;
		}

		public void SetCiphers (short[] ciphers, bool allow_unsupported)
		{
			CheckThrow ();
			var data = Marshal.AllocHGlobal (ciphers.Length * 2);
			try {
				Marshal.Copy (ciphers, 0, data, ciphers.Length);
				var ret = mono_btls_ssl_ctx_set_ciphers (
					Handle.DangerousGetHandle (),
					ciphers.Length, data, allow_unsupported ? 1 : 0);
				CheckError (ret > 0);
			} finally {
				Marshal.FreeHGlobal (data);
			}
		}

		public void SetVerifyParam (MonoBtlsX509VerifyParam param)
		{
			CheckThrow ();
			var ret = mono_btls_ssl_ctx_set_verify_param (
				Handle.DangerousGetHandle (),
				param.Handle.DangerousGetHandle ());
			CheckError (ret);
		}

		public void SetClientCertificateIssuers (string[] acceptableIssuers)
		{
			CheckThrow ();
			if (acceptableIssuers == null || acceptableIssuers.Length == 0)
				return;

			var count = acceptableIssuers.Length;
			var buffers = new byte[count][];
			var sizes = new int[count];
			var pointers = new IntPtr[count];

			var sizeData = IntPtr.Zero;
			var pointerData = IntPtr.Zero;

			try {
				for (int i = 0; i < count; i++) {
					var data = new X500DistinguishedName (acceptableIssuers[i]).RawData;
					sizes[i] = data.Length;
					pointers[i] = Marshal.AllocHGlobal (data.Length);
					Marshal.Copy (data, 0, pointers[i], data.Length);
				}

				sizeData = Marshal.AllocHGlobal (count * 4);
				Marshal.Copy (sizes, 0, sizeData, count);

				pointerData = Marshal.AllocHGlobal (count * 8);
				Marshal.Copy (pointers, 0, pointerData, count);

				var ret = mono_btls_ssl_ctx_set_client_ca_list (Handle.DangerousGetHandle (), count, sizeData, pointerData);
				CheckError (ret);
			} finally {
				for (int i = 0; i < count; i++) {
					if (pointers[i] != IntPtr.Zero)
						Marshal.FreeHGlobal (pointers [i]);
				}
				if (sizeData != IntPtr.Zero)
					Marshal.FreeHGlobal (sizeData);
				if (pointerData != IntPtr.Zero)
					Marshal.FreeHGlobal (pointerData);
			}
		}

		protected override void Close ()
		{
			if (store != null) {
				store.Dispose ();
				store = null;
			}
			if (instance.IsAllocated)
				instance.Free ();
			base.Close ();
		}
	}
}
#endif