564 lines
17 KiB
C#
564 lines
17 KiB
C#
//
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// X509Certificates.cs: Handles X.509 certificates.
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//
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// Author:
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// Sebastien Pouliot <sebastien@xamarin.com>
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//
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// (C) 2002, 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 2013 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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using System;
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using System.Runtime.Serialization;
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using System.Security.Cryptography;
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using System.Security.Permissions;
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using System.Text;
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namespace Emby.Common.Implementations.Security
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{
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// References:
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// a. Internet X.509 Public Key Infrastructure Certificate and CRL Profile
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// http://www.ietf.org/rfc/rfc3280.txt
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// b. ITU ASN.1 standards (free download)
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// http://www.itu.int/ITU-T/studygroups/com17/languages/
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public class X509Certificate : ISerializable
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{
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private ASN1 decoder;
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private byte[] m_encodedcert;
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private DateTime m_from;
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private DateTime m_until;
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private ASN1 issuer;
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private string m_issuername;
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private string m_keyalgo;
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private byte[] m_keyalgoparams;
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private ASN1 subject;
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private string m_subject;
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private byte[] m_publickey;
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private byte[] signature;
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private string m_signaturealgo;
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private byte[] m_signaturealgoparams;
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private byte[] certhash;
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private RSA _rsa;
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private DSA _dsa;
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// from http://msdn.microsoft.com/en-gb/library/ff635835.aspx
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private const string OID_DSA = "1.2.840.10040.4.1";
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private const string OID_RSA = "1.2.840.113549.1.1.1";
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// from http://www.ietf.org/rfc/rfc2459.txt
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//
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//Certificate ::= SEQUENCE {
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// tbsCertificate TBSCertificate,
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// signatureAlgorithm AlgorithmIdentifier,
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// signature BIT STRING }
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//
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//TBSCertificate ::= SEQUENCE {
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// version [0] Version DEFAULT v1,
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// serialNumber CertificateSerialNumber,
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// signature AlgorithmIdentifier,
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// issuer Name,
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// validity Validity,
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// subject Name,
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// subjectPublicKeyInfo SubjectPublicKeyInfo,
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// issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
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// -- If present, version shall be v2 or v3
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// subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
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// -- If present, version shall be v2 or v3
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// extensions [3] Extensions OPTIONAL
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// -- If present, version shall be v3 -- }
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private int version;
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private byte[] serialnumber;
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private byte[] issuerUniqueID;
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private byte[] subjectUniqueID;
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private X509ExtensionCollection extensions;
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private static string encoding_error = ("Input data cannot be coded as a valid certificate.");
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// that's were the real job is!
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private void Parse (byte[] data)
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{
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try {
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decoder = new ASN1 (data);
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// Certificate
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if (decoder.Tag != 0x30)
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throw new CryptographicException (encoding_error);
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// Certificate / TBSCertificate
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if (decoder [0].Tag != 0x30)
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throw new CryptographicException (encoding_error);
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ASN1 tbsCertificate = decoder [0];
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int tbs = 0;
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// Certificate / TBSCertificate / Version
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ASN1 v = decoder [0][tbs];
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version = 1; // DEFAULT v1
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if ((v.Tag == 0xA0) && (v.Count > 0)) {
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// version (optional) is present only in v2+ certs
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version += v [0].Value [0]; // zero based
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tbs++;
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}
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// Certificate / TBSCertificate / CertificateSerialNumber
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ASN1 sn = decoder [0][tbs++];
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if (sn.Tag != 0x02)
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throw new CryptographicException (encoding_error);
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serialnumber = sn.Value;
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Array.Reverse (serialnumber, 0, serialnumber.Length);
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// Certificate / TBSCertificate / AlgorithmIdentifier
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tbs++;
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// ASN1 signatureAlgo = tbsCertificate.Element (tbs++, 0x30);
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issuer = tbsCertificate.Element (tbs++, 0x30);
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m_issuername = X501.ToString (issuer);
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ASN1 validity = tbsCertificate.Element (tbs++, 0x30);
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ASN1 notBefore = validity [0];
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m_from = ASN1Convert.ToDateTime (notBefore);
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ASN1 notAfter = validity [1];
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m_until = ASN1Convert.ToDateTime (notAfter);
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subject = tbsCertificate.Element (tbs++, 0x30);
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m_subject = X501.ToString (subject);
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ASN1 subjectPublicKeyInfo = tbsCertificate.Element (tbs++, 0x30);
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ASN1 algorithm = subjectPublicKeyInfo.Element (0, 0x30);
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ASN1 algo = algorithm.Element (0, 0x06);
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m_keyalgo = ASN1Convert.ToOid (algo);
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// parameters ANY DEFINED BY algorithm OPTIONAL
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// so we dont ask for a specific (Element) type and return DER
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ASN1 parameters = algorithm [1];
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m_keyalgoparams = ((algorithm.Count > 1) ? parameters.GetBytes () : null);
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ASN1 subjectPublicKey = subjectPublicKeyInfo.Element (1, 0x03);
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// we must drop th first byte (which is the number of unused bits
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// in the BITSTRING)
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int n = subjectPublicKey.Length - 1;
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m_publickey = new byte [n];
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Buffer.BlockCopy (subjectPublicKey.Value, 1, m_publickey, 0, n);
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// signature processing
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byte[] bitstring = decoder [2].Value;
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// first byte contains unused bits in first byte
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signature = new byte [bitstring.Length - 1];
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Buffer.BlockCopy (bitstring, 1, signature, 0, signature.Length);
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algorithm = decoder [1];
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algo = algorithm.Element (0, 0x06);
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m_signaturealgo = ASN1Convert.ToOid (algo);
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parameters = algorithm [1];
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if (parameters != null)
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m_signaturealgoparams = parameters.GetBytes ();
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else
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m_signaturealgoparams = null;
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// Certificate / TBSCertificate / issuerUniqueID
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ASN1 issuerUID = tbsCertificate.Element (tbs, 0x81);
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if (issuerUID != null) {
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tbs++;
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issuerUniqueID = issuerUID.Value;
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}
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// Certificate / TBSCertificate / subjectUniqueID
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ASN1 subjectUID = tbsCertificate.Element (tbs, 0x82);
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if (subjectUID != null) {
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tbs++;
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subjectUniqueID = subjectUID.Value;
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}
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// Certificate / TBSCertificate / Extensions
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ASN1 extns = tbsCertificate.Element (tbs, 0xA3);
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if ((extns != null) && (extns.Count == 1))
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extensions = new X509ExtensionCollection (extns [0]);
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else
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extensions = new X509ExtensionCollection (null);
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// keep a copy of the original data
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m_encodedcert = (byte[]) data.Clone ();
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}
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catch (Exception ex) {
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throw new CryptographicException (encoding_error, ex);
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}
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}
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// constructors
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public X509Certificate (byte[] data)
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{
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if (data != null) {
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// does it looks like PEM ?
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if ((data.Length > 0) && (data [0] != 0x30)) {
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try {
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data = PEM ("CERTIFICATE", data);
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}
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catch (Exception ex) {
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throw new CryptographicException (encoding_error, ex);
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}
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}
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Parse (data);
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}
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}
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private byte[] GetUnsignedBigInteger (byte[] integer)
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{
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if (integer [0] == 0x00) {
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// this first byte is added so we're sure it's an unsigned integer
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// however we can't feed it into RSAParameters or DSAParameters
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int length = integer.Length - 1;
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byte[] uinteger = new byte [length];
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Buffer.BlockCopy (integer, 1, uinteger, 0, length);
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return uinteger;
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}
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else
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return integer;
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}
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// public methods
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public DSA DSA {
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get {
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if (m_keyalgoparams == null)
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throw new CryptographicException ("Missing key algorithm parameters.");
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if (_dsa == null && m_keyalgo == OID_DSA) {
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DSAParameters dsaParams = new DSAParameters ();
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// for DSA m_publickey contains 1 ASN.1 integer - Y
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ASN1 pubkey = new ASN1 (m_publickey);
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if ((pubkey == null) || (pubkey.Tag != 0x02))
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return null;
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dsaParams.Y = GetUnsignedBigInteger (pubkey.Value);
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ASN1 param = new ASN1 (m_keyalgoparams);
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if ((param == null) || (param.Tag != 0x30) || (param.Count < 3))
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return null;
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if ((param [0].Tag != 0x02) || (param [1].Tag != 0x02) || (param [2].Tag != 0x02))
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return null;
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dsaParams.P = GetUnsignedBigInteger (param [0].Value);
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dsaParams.Q = GetUnsignedBigInteger (param [1].Value);
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dsaParams.G = GetUnsignedBigInteger (param [2].Value);
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// BUG: MS BCL 1.0 can't import a key which
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// isn't the same size as the one present in
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// the container.
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_dsa = (DSA) new DSACryptoServiceProvider (dsaParams.Y.Length << 3);
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_dsa.ImportParameters (dsaParams);
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}
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return _dsa;
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}
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set {
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_dsa = value;
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if (value != null)
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_rsa = null;
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}
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}
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public X509ExtensionCollection Extensions {
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get { return extensions; }
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}
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public byte[] Hash {
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get {
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if (certhash == null) {
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if ((decoder == null) || (decoder.Count < 1))
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return null;
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string algo = PKCS1.HashNameFromOid (m_signaturealgo, false);
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if (algo == null)
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return null;
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byte[] toBeSigned = decoder [0].GetBytes ();
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using (var hash = PKCS1.CreateFromName (algo))
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certhash = hash.ComputeHash (toBeSigned, 0, toBeSigned.Length);
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}
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return (byte[]) certhash.Clone ();
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}
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}
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public virtual string IssuerName {
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get { return m_issuername; }
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}
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public virtual string KeyAlgorithm {
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get { return m_keyalgo; }
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}
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public virtual byte[] KeyAlgorithmParameters {
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get {
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if (m_keyalgoparams == null)
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return null;
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return (byte[]) m_keyalgoparams.Clone ();
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}
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set { m_keyalgoparams = value; }
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}
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public virtual byte[] PublicKey {
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get {
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if (m_publickey == null)
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return null;
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return (byte[]) m_publickey.Clone ();
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}
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}
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public virtual RSA RSA {
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get {
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if (_rsa == null && m_keyalgo == OID_RSA) {
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RSAParameters rsaParams = new RSAParameters ();
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// for RSA m_publickey contains 2 ASN.1 integers
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// the modulus and the public exponent
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ASN1 pubkey = new ASN1 (m_publickey);
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ASN1 modulus = pubkey [0];
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if ((modulus == null) || (modulus.Tag != 0x02))
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return null;
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ASN1 exponent = pubkey [1];
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if (exponent.Tag != 0x02)
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return null;
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rsaParams.Modulus = GetUnsignedBigInteger (modulus.Value);
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rsaParams.Exponent = exponent.Value;
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// BUG: MS BCL 1.0 can't import a key which
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// isn't the same size as the one present in
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// the container.
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int keySize = (rsaParams.Modulus.Length << 3);
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_rsa = (RSA) new RSACryptoServiceProvider (keySize);
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_rsa.ImportParameters (rsaParams);
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}
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return _rsa;
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}
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set {
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if (value != null)
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_dsa = null;
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_rsa = value;
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}
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}
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public virtual byte[] RawData {
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get {
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if (m_encodedcert == null)
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return null;
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return (byte[]) m_encodedcert.Clone ();
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}
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}
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public virtual byte[] SerialNumber {
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get {
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if (serialnumber == null)
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return null;
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return (byte[]) serialnumber.Clone ();
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}
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}
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public virtual byte[] Signature {
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get {
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if (signature == null)
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return null;
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switch (m_signaturealgo) {
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case "1.2.840.113549.1.1.2": // MD2 with RSA encryption
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case "1.2.840.113549.1.1.3": // MD4 with RSA encryption
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case "1.2.840.113549.1.1.4": // MD5 with RSA encryption
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case "1.2.840.113549.1.1.5": // SHA-1 with RSA Encryption
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case "1.3.14.3.2.29": // SHA1 with RSA signature
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case "1.2.840.113549.1.1.11": // SHA-256 with RSA Encryption
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case "1.2.840.113549.1.1.12": // SHA-384 with RSA Encryption
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case "1.2.840.113549.1.1.13": // SHA-512 with RSA Encryption
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case "1.3.36.3.3.1.2": // RIPEMD160 with RSA Encryption
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return (byte[]) signature.Clone ();
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case "1.2.840.10040.4.3": // SHA-1 with DSA
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ASN1 sign = new ASN1 (signature);
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if ((sign == null) || (sign.Count != 2))
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return null;
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byte[] part1 = sign [0].Value;
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byte[] part2 = sign [1].Value;
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byte[] sig = new byte [40];
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// parts may be less than 20 bytes (i.e. first bytes were 0x00)
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// parts may be more than 20 bytes (i.e. first byte > 0x80, negative)
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int s1 = System.Math.Max (0, part1.Length - 20);
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int e1 = System.Math.Max (0, 20 - part1.Length);
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Buffer.BlockCopy (part1, s1, sig, e1, part1.Length - s1);
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int s2 = System.Math.Max (0, part2.Length - 20);
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int e2 = System.Math.Max (20, 40 - part2.Length);
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Buffer.BlockCopy (part2, s2, sig, e2, part2.Length - s2);
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return sig;
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default:
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throw new CryptographicException ("Unsupported hash algorithm: " + m_signaturealgo);
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}
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}
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}
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public virtual string SignatureAlgorithm {
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get { return m_signaturealgo; }
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}
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public virtual byte[] SignatureAlgorithmParameters {
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get {
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if (m_signaturealgoparams == null)
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return m_signaturealgoparams;
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return (byte[]) m_signaturealgoparams.Clone ();
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}
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}
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public virtual string SubjectName {
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get { return m_subject; }
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}
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public virtual DateTime ValidFrom {
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get { return m_from; }
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}
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public virtual DateTime ValidUntil {
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get { return m_until; }
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}
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public int Version {
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get { return version; }
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}
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public bool IsCurrent {
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get { return WasCurrent (DateTime.UtcNow); }
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}
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public bool WasCurrent (DateTime instant)
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{
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return ((instant > ValidFrom) && (instant <= ValidUntil));
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}
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// uncommon v2 "extension"
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public byte[] IssuerUniqueIdentifier {
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get {
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if (issuerUniqueID == null)
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return null;
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return (byte[]) issuerUniqueID.Clone ();
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}
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}
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// uncommon v2 "extension"
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public byte[] SubjectUniqueIdentifier {
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get {
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if (subjectUniqueID == null)
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return null;
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return (byte[]) subjectUniqueID.Clone ();
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}
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}
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internal bool VerifySignature (DSA dsa)
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{
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// signatureOID is check by both this.Hash and this.Signature
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DSASignatureDeformatter v = new DSASignatureDeformatter (dsa);
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// only SHA-1 is supported
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v.SetHashAlgorithm ("SHA1");
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return v.VerifySignature (this.Hash, this.Signature);
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}
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internal bool VerifySignature (RSA rsa)
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{
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// SHA1-1 with DSA
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if (m_signaturealgo == "1.2.840.10040.4.3")
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return false;
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RSAPKCS1SignatureDeformatter v = new RSAPKCS1SignatureDeformatter (rsa);
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v.SetHashAlgorithm (PKCS1.HashNameFromOid (m_signaturealgo));
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return v.VerifySignature (this.Hash, this.Signature);
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}
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public bool VerifySignature (AsymmetricAlgorithm aa)
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{
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if (aa == null)
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throw new ArgumentNullException ("aa");
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if (aa is RSA)
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return VerifySignature (aa as RSA);
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else if (aa is DSA)
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return VerifySignature (aa as DSA);
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else
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throw new NotSupportedException ("Unknown Asymmetric Algorithm " + aa.ToString ());
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}
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public bool CheckSignature (byte[] hash, string hashAlgorithm, byte[] signature)
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{
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RSACryptoServiceProvider r = (RSACryptoServiceProvider) RSA;
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return r.VerifyHash (hash, hashAlgorithm, signature);
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}
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public bool IsSelfSigned {
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get {
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if (m_issuername != m_subject)
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return false;
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try {
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if (RSA != null)
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return VerifySignature (RSA);
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else if (DSA != null)
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|
return VerifySignature (DSA);
|
|
else
|
|
return false; // e.g. a certificate with only DSA parameters
|
|
}
|
|
catch (CryptographicException) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
public ASN1 GetIssuerName ()
|
|
{
|
|
return issuer;
|
|
}
|
|
|
|
public ASN1 GetSubjectName ()
|
|
{
|
|
return subject;
|
|
}
|
|
|
|
protected X509Certificate (SerializationInfo info, StreamingContext context)
|
|
{
|
|
Parse ((byte[]) info.GetValue ("raw", typeof (byte[])));
|
|
}
|
|
|
|
[SecurityPermission (SecurityAction.Demand, SerializationFormatter = true)]
|
|
public virtual void GetObjectData (SerializationInfo info, StreamingContext context)
|
|
{
|
|
info.AddValue ("raw", m_encodedcert);
|
|
// note: we NEVER serialize the private key
|
|
}
|
|
|
|
static byte[] PEM (string type, byte[] data)
|
|
{
|
|
string pem = Encoding.ASCII.GetString (data);
|
|
string header = String.Format ("-----BEGIN {0}-----", type);
|
|
string footer = String.Format ("-----END {0}-----", type);
|
|
int start = pem.IndexOf (header) + header.Length;
|
|
int end = pem.IndexOf (footer, start);
|
|
string base64 = pem.Substring (start, (end - start));
|
|
return Convert.FromBase64String (base64);
|
|
}
|
|
}
|
|
}
|