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//
// NetscapeCertTypeExtension.cs: Handles Netscape CertType extensions.
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) 2004 Novell (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;
using Mono.Security;
using Mono.Security.X509;
namespace Mono.Security.X509.Extensions {
// References:
// a. Netscape Certificate Extensions Navigator 3.0 Version
// http://wp.netscape.com/eng/security/cert-exts.html
// b. Netscape Certificate Extensions Communicator 4.0 Version
// http://wp.netscape.com/eng/security/comm4-cert-exts.html
// c. 2.16.840.1.113730.1.1 - Netscape certificate type
// http://www.alvestrand.no/objectid/2.16.840.1.113730.1.1.html
#if INSIDE_SYSTEM
internal
#else
public
#endif
class NetscapeCertTypeExtension : X509Extension {
/*
* bit-0 SSL client - this cert is certified for SSL client authentication use
* bit-1 SSL server - this cert is certified for SSL server authentication use
* bit-2 S/MIME - this cert is certified for use by clients(New in PR3)
* bit-3 Object Signing - this cert is certified for signing objects such as Java applets and plugins(New in PR3)
* bit-4 Reserved - this bit is reserved for future use
* bit-5 SSL CA - this cert is certified for issuing certs for SSL use
* bit-6 S/MIME CA - this cert is certified for issuing certs for S/MIME use(New in PR3)
* bit-7 Object Signing CA - this cert is certified for issuing certs for Object Signing(New in PR3)
*/
// note: because nothing is simple in ASN.1 bits are reversed
[Flags]
public enum CertTypes {
SslClient = 0x80,
SslServer = 0x40,
Smime = 0x20,
ObjectSigning = 0x10,
SslCA = 0x04,
SmimeCA = 0x02,
ObjectSigningCA = 0x01
}
private int ctbits;
public NetscapeCertTypeExtension () : base ()
{
extnOid = "2.16.840.1.113730.1.1";
}
public NetscapeCertTypeExtension (ASN1 asn1) : base (asn1)
{
}
public NetscapeCertTypeExtension (X509Extension extension) : base (extension)
{
}
protected override void Decode ()
{
ASN1 bitString = new ASN1 (extnValue.Value);
if (bitString.Tag != 0x03)
throw new ArgumentException ("Invalid NetscapeCertType extension");
int i = 1; // byte zero has the number of unused bits (ASN1's BITSTRING)
while (i < bitString.Value.Length)
ctbits = (ctbits << 8) + bitString.Value [i++];
}
public override string Name {
get { return "NetscapeCertType"; }
}
/* public CertType Type {
get { return ctbits; }
set { ctbits = value; }
}*/
public bool Support (CertTypes usage)
{
int x = Convert.ToInt32 (usage, CultureInfo.InvariantCulture);
return ((x & ctbits) == x);
}
public override string ToString ()
{
const string separator = " , ";
StringBuilder sb = new StringBuilder ();
if (Support (CertTypes.SslClient))
sb.Append ("SSL Client Authentication");
if (Support (CertTypes.SslServer)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("SSL Server Authentication");
}
if (Support (CertTypes.Smime)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("SMIME");
}
if (Support (CertTypes.ObjectSigning)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("Object Signing");
}
if (Support (CertTypes.SslCA)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("SSL CA");
}
if (Support (CertTypes.SmimeCA)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("SMIME CA");
}
if (Support (CertTypes.ObjectSigningCA)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("Object Signing CA");
}
sb.Append ("(");
sb.Append (ctbits.ToString ("X2", CultureInfo.InvariantCulture));
sb.Append (")");
sb.Append (Environment.NewLine);
return sb.ToString ();
}
}
}
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