401 lines
11 KiB
C#
401 lines
11 KiB
C#
//
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// X509Certificate2ImplMono
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//
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// Authors:
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// Sebastien Pouliot <sebastien@xamarin.com>
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// Martin Baulig <martin.baulig@xamarin.com>
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//
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// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
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// Copyright (C) 2004-2006 Novell Inc. (http://www.novell.com)
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// Copyright (C) 2015-2016 Xamarin, Inc. (http://www.xamarin.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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#if MONO_SECURITY_ALIAS
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extern alias MonoSecurity;
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using MonoSecurity::Mono.Security;
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using MonoSecurity::Mono.Security.Cryptography;
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using MonoSecurity::Mono.Security.Authenticode;
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using MX = MonoSecurity::Mono.Security.X509;
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#else
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using Mono.Security;
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using Mono.Security.Cryptography;
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#if !MONOTOUCH_WATCH
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using Mono.Security.Authenticode;
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#endif
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using MX = Mono.Security.X509;
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#endif
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using System.IO;
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using System.Text;
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using System.Collections;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using Microsoft.Win32.SafeHandles;
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namespace System.Security.Cryptography.X509Certificates
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{
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internal class X509Certificate2ImplMono : X509Certificate2ImplUnix
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{
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PublicKey _publicKey;
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X509CertificateImplCollection intermediateCerts;
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MX.X509Certificate _cert;
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static string empty_error = Locale.GetText ("Certificate instance is empty.");
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public override bool IsValid {
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get {
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return _cert != null;
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}
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}
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public override IntPtr Handle {
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get { return IntPtr.Zero; }
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}
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public override IntPtr GetNativeAppleCertificate ()
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{
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return IntPtr.Zero;
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}
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public X509Certificate2ImplMono (MX.X509Certificate cert)
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{
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this._cert = cert;
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}
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X509Certificate2ImplMono (X509Certificate2ImplMono other)
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{
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_cert = other._cert;
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if (other.intermediateCerts != null)
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intermediateCerts = other.intermediateCerts.Clone ();
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}
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public X509Certificate2ImplMono (byte[] rawData, SafePasswordHandle password, X509KeyStorageFlags keyStorageFlags)
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{
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switch (X509Certificate2.GetCertContentType (rawData)) {
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case X509ContentType.Pkcs12:
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_cert = ImportPkcs12 (rawData, password);
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break;
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case X509ContentType.Cert:
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case X509ContentType.Pkcs7:
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_cert = new MX.X509Certificate (rawData);
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break;
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#if !MONOTOUCH_WATCH
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case X509ContentType.Authenticode:
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AuthenticodeDeformatter ad = new AuthenticodeDeformatter (rawData);
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_cert = ad.SigningCertificate;
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if (_cert == null)
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goto default;
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break;
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#endif
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default:
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string msg = Locale.GetText ("Unable to decode certificate.");
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throw new CryptographicException (msg);
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}
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}
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public override X509CertificateImpl Clone ()
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{
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ThrowIfContextInvalid ();
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return new X509Certificate2ImplMono (this);
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}
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MX.X509Certificate Cert {
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get {
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ThrowIfContextInvalid ();
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return _cert;
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}
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}
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#region Implemented X509CertificateImpl members
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protected override byte[] GetRawCertData ()
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{
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ThrowIfContextInvalid ();
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return Cert.RawData;
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}
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public override bool Equals (X509CertificateImpl other, out bool result)
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{
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// Use default implementation
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result = false;
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return false;
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}
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#endregion
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// constructors
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public X509Certificate2ImplMono ()
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{
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_cert = null;
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}
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// properties
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// FIXME - Could be more efficient
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public override bool HasPrivateKey {
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get { return PrivateKey != null; }
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}
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public override AsymmetricAlgorithm PrivateKey {
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get {
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if (_cert == null)
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throw new CryptographicException (empty_error);
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try {
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if (_cert.RSA is RSACryptoServiceProvider rcsp) {
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if (rcsp.PublicOnly)
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return null;
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var key = new RSACryptoServiceProvider ();
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key.ImportParameters (_cert.RSA.ExportParameters (true));
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return key;
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}
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if (_cert.RSA is RSAManaged rsam) {
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if (rsam.PublicOnly)
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return null;
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var key = new RSAManaged ();
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key.ImportParameters (_cert.RSA.ExportParameters (true));
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return key;
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}
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if (_cert.DSA is DSACryptoServiceProvider dcsp) {
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if (dcsp.PublicOnly)
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return null;
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var key = new DSACryptoServiceProvider ();
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key.ImportParameters (_cert.DSA.ExportParameters (true));
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return key;
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}
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} catch {
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}
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return null;
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}
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set {
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if (_cert == null)
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throw new CryptographicException (empty_error);
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// allow NULL so we can "forget" the key associated to the certificate
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// e.g. in case we want to export it in another format (see bug #396620)
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if (value == null) {
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_cert.RSA = null;
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_cert.DSA = null;
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} else if (value is RSA)
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_cert.RSA = (RSA)value;
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else if (value is DSA)
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_cert.DSA = (DSA)value;
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else
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throw new NotSupportedException ();
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}
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}
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public override RSA GetRSAPrivateKey ()
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{
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return PrivateKey as RSA;
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}
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public override DSA GetDSAPrivateKey ()
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{
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return PrivateKey as DSA;
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}
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public override PublicKey PublicKey {
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get {
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if (_cert == null)
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throw new CryptographicException (empty_error);
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if (_publicKey == null) {
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try {
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_publicKey = new PublicKey (_cert);
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} catch (Exception e) {
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string msg = Locale.GetText ("Unable to decode public key.");
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throw new CryptographicException (msg, e);
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}
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}
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return _publicKey;
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}
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}
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// methods
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MX.X509Certificate ImportPkcs12 (byte[] rawData, SafePasswordHandle password)
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{
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if (password == null || password.IsInvalid)
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return ImportPkcs12 (rawData, (string)null);
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var passwordString = password.Mono_DangerousGetString ();
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return ImportPkcs12 (rawData, passwordString);
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}
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MX.X509Certificate ImportPkcs12 (byte[] rawData, string password)
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{
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MX.PKCS12 pfx = null;
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if (string.IsNullOrEmpty (password)) {
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try {
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// Support both unencrypted PKCS#12..
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pfx = new MX.PKCS12 (rawData, (string)null);
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} catch {
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// ..and PKCS#12 encrypted with an empty password
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pfx = new MX.PKCS12 (rawData, string.Empty);
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}
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} else {
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pfx = new MX.PKCS12 (rawData, password);
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}
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if (pfx.Certificates.Count == 0) {
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// no certificate was found
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return null;
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} else if (pfx.Keys.Count == 0) {
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// no key were found - pick the first certificate
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return pfx.Certificates [0];
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} else {
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// find the certificate that match the first key
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MX.X509Certificate cert = null;
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var keypair = (pfx.Keys [0] as AsymmetricAlgorithm);
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string pubkey = keypair.ToXmlString (false);
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foreach (var c in pfx.Certificates) {
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if (((c.RSA != null) && (pubkey == c.RSA.ToXmlString (false))) ||
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((c.DSA != null) && (pubkey == c.DSA.ToXmlString (false)))) {
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cert = c;
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break;
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}
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}
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if (cert == null) {
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cert = pfx.Certificates [0]; // no match, pick first certificate without keys
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} else {
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cert.RSA = (keypair as RSA);
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cert.DSA = (keypair as DSA);
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}
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if (pfx.Certificates.Count > 1) {
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intermediateCerts = new X509CertificateImplCollection ();
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foreach (var c in pfx.Certificates) {
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if (c == cert)
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continue;
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var impl = new X509Certificate2ImplMono (c);
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intermediateCerts.Add (impl, true);
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}
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}
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return cert;
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}
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}
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public override void Reset ()
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{
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_cert = null;
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_publicKey = null;
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if (intermediateCerts != null) {
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intermediateCerts.Dispose ();
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intermediateCerts = null;
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}
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}
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[MonoTODO ("by default this depends on the incomplete X509Chain")]
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public override bool Verify (X509Certificate2 thisCertificate)
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{
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if (_cert == null)
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throw new CryptographicException (empty_error);
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X509Chain chain = X509Chain.Create ();
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if (!chain.Build (thisCertificate))
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return false;
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// TODO - check chain and other stuff ???
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return true;
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}
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// static methods
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private static byte[] signedData = new byte[] { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x07, 0x02 };
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[MonoTODO ("Detection limited to Cert, Pfx, Pkcs12, Pkcs7 and Unknown")]
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public static X509ContentType GetCertContentType (byte[] rawData)
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{
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if ((rawData == null) || (rawData.Length == 0))
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throw new ArgumentException ("rawData");
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X509ContentType type = X509ContentType.Unknown;
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try {
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ASN1 data = new ASN1 (rawData);
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if (data.Tag != 0x30) {
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string msg = Locale.GetText ("Unable to decode certificate.");
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throw new CryptographicException (msg);
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}
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if (data.Count == 0)
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return type;
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if (data.Count == 3) {
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switch (data [0].Tag) {
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case 0x30:
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// SEQUENCE / SEQUENCE / BITSTRING
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if ((data [1].Tag == 0x30) && (data [2].Tag == 0x03))
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type = X509ContentType.Cert;
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break;
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case 0x02:
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// INTEGER / SEQUENCE / SEQUENCE
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if ((data [1].Tag == 0x30) && (data [2].Tag == 0x30))
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type = X509ContentType.Pkcs12;
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// note: Pfx == Pkcs12
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break;
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}
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}
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// check for PKCS#7 (count unknown but greater than 0)
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// SEQUENCE / OID (signedData)
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if ((data [0].Tag == 0x06) && data [0].CompareValue (signedData))
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type = X509ContentType.Pkcs7;
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}
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catch (Exception e) {
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string msg = Locale.GetText ("Unable to decode certificate.");
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throw new CryptographicException (msg, e);
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}
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return type;
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}
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[MonoTODO ("Detection limited to Cert, Pfx, Pkcs12 and Unknown")]
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public static X509ContentType GetCertContentType (string fileName)
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{
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if (fileName == null)
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throw new ArgumentNullException ("fileName");
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if (fileName.Length == 0)
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throw new ArgumentException ("fileName");
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byte[] data = File.ReadAllBytes (fileName);
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return GetCertContentType (data);
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}
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internal override X509CertificateImplCollection IntermediateCertificates {
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get { return intermediateCerts; }
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}
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// internal stuff because X509Certificate2 isn't complete enough
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// (maybe X509Certificate3 will be better?)
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internal MX.X509Certificate MonoCertificate {
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get { return _cert; }
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}
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internal override X509Certificate2Impl FallbackImpl {
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get { return this; }
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}
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}
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}
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