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//
// CRLDistributionPointsExtension.cs: Handles X.509 CRLDistributionPoints 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.Collections.Generic;
using System.Text;
using Mono.Security;
using Mono.Security.X509;
namespace Mono.Security.X509.Extensions {
// References:
// a. Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile
// http://www.ietf.org/rfc/rfc3280.txt
// b. 2.5.29.31 - CRL Distribution Points
// http://www.alvestrand.no/objectid/2.5.29.31.html
/*
* id-ce-cRLDistributionPoints OBJECT IDENTIFIER ::= { id-ce 31 }
*
* CRLDistributionPoints ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint
*
* DistributionPoint ::= SEQUENCE {
* distributionPoint [0] DistributionPointName OPTIONAL,
* reasons [1] ReasonFlags OPTIONAL,
* cRLIssuer [2] GeneralNames OPTIONAL
* }
*
* DistributionPointName ::= CHOICE {
* fullName [0] GeneralNames,
* nameRelativeToCRLIssuer [1] RelativeDistinguishedName
* }
*
* ReasonFlags ::= BIT STRING {
* unused (0),
* keyCompromise (1),
* cACompromise (2),
* affiliationChanged (3),
* superseded (4),
* cessationOfOperation (5),
* certificateHold (6),
* privilegeWithdrawn (7),
* aACompromise (8) }
*/
public class CRLDistributionPointsExtension : X509Extension {
public class DistributionPoint {
public string Name { get; private set; }
public ReasonFlags Reasons { get; private set; }
public string CRLIssuer { get; private set; }
public DistributionPoint (string dp, ReasonFlags reasons, string issuer)
{
Name = dp;
Reasons = reasons;
CRLIssuer = issuer;
}
public DistributionPoint (ASN1 dp)
{
for (int i = 0; i < dp.Count; i++) {
ASN1 el = dp[i];
switch (el.Tag) {
case 0xA0: // DistributionPointName OPTIONAL
for (int j = 0; j < el.Count; j++) {
ASN1 dpn = el [j];
if (dpn.Tag == 0xA0) {
Name = new GeneralNames (dpn).ToString ();
}
}
break;
case 0xA1: // ReasonFlags OPTIONAL
break;
case 0xA2: // RelativeDistinguishedName
break;
}
}
}
}
[Flags]
public enum ReasonFlags
{
Unused = 0,
KeyCompromise = 1,
CACompromise = 2,
AffiliationChanged = 3,
Superseded = 4,
CessationOfOperation = 5,
CertificateHold = 6,
PrivilegeWithdrawn = 7,
AACompromise = 8
}
private List<DistributionPoint> dps;
public CRLDistributionPointsExtension () : base ()
{
extnOid = "2.5.29.31";
dps = new List<DistributionPoint> ();
}
public CRLDistributionPointsExtension (ASN1 asn1)
: base (asn1)
{
}
public CRLDistributionPointsExtension (X509Extension extension)
: base (extension)
{
}
protected override void Decode ()
{
dps = new List<DistributionPoint> ();
ASN1 sequence = new ASN1 (extnValue.Value);
if (sequence.Tag != 0x30)
throw new ArgumentException ("Invalid CRLDistributionPoints extension");
// for every distribution point
for (int i=0; i < sequence.Count; i++) {
dps.Add (new DistributionPoint (sequence [i]));
}
}
public override string Name {
get { return "CRL Distribution Points"; }
}
public IEnumerable<DistributionPoint> DistributionPoints {
get { return dps; }
}
public override string ToString ()
{
StringBuilder sb = new StringBuilder ();
int i = 1;
foreach (DistributionPoint dp in dps) {
sb.Append ("[");
sb.Append (i++);
sb.Append ("]CRL Distribution Point");
sb.Append (Environment.NewLine);
sb.Append ("\tDistribution Point Name:");
sb.Append ("\t\tFull Name:");
sb.Append (Environment.NewLine);
sb.Append ("\t\t\t");
sb.Append (dp.Name);
sb.Append (Environment.NewLine);
}
return sb.ToString ();
}
}
}
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