jellyfin/MediaBrowser.Server.Mono/Security/X509Extension.cs
2016-06-30 17:56:14 -04:00

208 lines
5.2 KiB
C#

//
// X509Extension.cs: Base class for all X.509 extensions.
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.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.
//
using System;
using System.Globalization;
using System.Text;
namespace MediaBrowser.Server.Mono.Security {
/*
* Extension ::= SEQUENCE {
* extnID OBJECT IDENTIFIER,
* critical BOOLEAN DEFAULT FALSE,
* extnValue OCTET STRING
* }
*/
public class X509Extension {
protected string extnOid;
protected bool extnCritical;
protected ASN1 extnValue;
protected X509Extension ()
{
extnCritical = false;
}
public X509Extension (ASN1 asn1)
{
if ((asn1.Tag != 0x30) || (asn1.Count < 2))
throw new ArgumentException (("Invalid X.509 extension."));
if (asn1[0].Tag != 0x06)
throw new ArgumentException (("Invalid X.509 extension."));
extnOid = ASN1Convert.ToOid (asn1[0]);
extnCritical = ((asn1[1].Tag == 0x01) && (asn1[1].Value[0] == 0xFF));
// last element is an octet string which may need to be decoded
extnValue = asn1 [asn1.Count - 1];
if ((extnValue.Tag == 0x04) && (extnValue.Length > 0) && (extnValue.Count == 0)) {
try {
ASN1 encapsulated = new ASN1 (extnValue.Value);
extnValue.Value = null;
extnValue.Add (encapsulated);
}
catch {
// data isn't ASN.1
}
}
Decode ();
}
public X509Extension (X509Extension extension)
{
if (extension == null)
throw new ArgumentNullException ("extension");
if ((extension.Value == null) || (extension.Value.Tag != 0x04) || (extension.Value.Count != 1))
throw new ArgumentException (("Invalid X.509 extension."));
extnOid = extension.Oid;
extnCritical = extension.Critical;
extnValue = extension.Value;
Decode ();
}
// encode the extension *into* an OCTET STRING
protected virtual void Decode ()
{
}
// decode the extension from *inside* an OCTET STRING
protected virtual void Encode ()
{
}
public ASN1 ASN1 {
get {
ASN1 extension = new ASN1 (0x30);
extension.Add (ASN1Convert.FromOid (extnOid));
if (extnCritical)
extension.Add (new ASN1 (0x01, new byte [1] { 0xFF }));
Encode ();
extension.Add (extnValue);
return extension;
}
}
public string Oid {
get { return extnOid; }
}
public bool Critical {
get { return extnCritical; }
set { extnCritical = value; }
}
// this gets overrided with more meaningful names
public virtual string Name {
get { return extnOid; }
}
public ASN1 Value {
get {
if (extnValue == null) {
Encode ();
}
return extnValue;
}
}
public override bool Equals (object obj)
{
if (obj == null)
return false;
X509Extension ex = (obj as X509Extension);
if (ex == null)
return false;
if (extnCritical != ex.extnCritical)
return false;
if (extnOid != ex.extnOid)
return false;
if (extnValue.Length != ex.extnValue.Length)
return false;
for (int i=0; i < extnValue.Length; i++) {
if (extnValue [i] != ex.extnValue [i])
return false;
}
return true;
}
public byte[] GetBytes ()
{
return ASN1.GetBytes ();
}
public override int GetHashCode ()
{
// OID should be unique in a collection of extensions
return extnOid.GetHashCode ();
}
private void WriteLine (StringBuilder sb, int n, int pos)
{
byte[] value = extnValue.Value;
int p = pos;
for (int j=0; j < 8; j++) {
if (j < n) {
sb.Append (value [p++].ToString ("X2", CultureInfo.InvariantCulture));
sb.Append (" ");
}
else
sb.Append (" ");
}
sb.Append (" ");
p = pos;
for (int j=0; j < n; j++) {
byte b = value [p++];
if (b < 0x20)
sb.Append (".");
else
sb.Append (Convert.ToChar (b));
}
sb.Append (Environment.NewLine);
}
public override string ToString ()
{
StringBuilder sb = new StringBuilder ();
int div = (extnValue.Length >> 3);
int rem = (extnValue.Length - (div << 3));
int x = 0;
for (int i=0; i < div; i++) {
WriteLine (sb, 8, x);
x += 8;
}
WriteLine (sb, rem, x);
return sb.ToString ();
}
}
}