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//
// BasicConstraintsExtension.cs: Handles X.509 BasicConstrains 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;
using Mono.Security;
using Mono.Security.X509;
namespace Mono.Security.X509.Extensions {
// References:
// 1. RFC 3280: Internet X.509 Public Key Infrastructure, Section 4.2.1.10
// http://www.ietf.org/rfc/rfc3280.txt
/* id-ce-basicConstraints OBJECT IDENTIFIER ::= { id-ce 19 }
*
* BasicConstraints ::= SEQUENCE {
* cA BOOLEAN DEFAULT FALSE,
* pathLenConstraint INTEGER (0..MAX) OPTIONAL
* }
*/
#if INSIDE_CORLIB || INSIDE_SYSTEM
internal
#else
public
#endif
class BasicConstraintsExtension : X509Extension {
public const int NoPathLengthConstraint = -1;
private bool cA;
private int pathLenConstraint;
public BasicConstraintsExtension () : base ()
{
extnOid = "2.5.29.19";
pathLenConstraint = NoPathLengthConstraint;
}
public BasicConstraintsExtension (ASN1 asn1) : base (asn1) {}
public BasicConstraintsExtension (X509Extension extension) : base (extension) {}
protected override void Decode ()
{
// default values
cA = false;
pathLenConstraint = NoPathLengthConstraint;
ASN1 sequence = new ASN1 (extnValue.Value);
if (sequence.Tag != 0x30)
throw new ArgumentException ("Invalid BasicConstraints extension");
int n = 0;
ASN1 a = sequence [n++];
if ((a != null) && (a.Tag == 0x01)) {
cA = (a.Value [0] == 0xFF);
a = sequence [n++];
}
if ((a != null) && (a.Tag == 0x02))
pathLenConstraint = ASN1Convert.ToInt32 (a);
}
protected override void Encode ()
{
ASN1 seq = new ASN1 (0x30);
if (cA)
seq.Add (new ASN1 (0x01, new byte[] { 0xFF }));
// CAs MUST NOT include the pathLenConstraint field unless the cA boolean is asserted
if (cA && (pathLenConstraint >= 0))
seq.Add (ASN1Convert.FromInt32 (pathLenConstraint));
extnValue = new ASN1 (0x04);
extnValue.Add (seq);
}
public bool CertificateAuthority {
get { return cA; }
set { cA = value; }
}
public override string Name {
get { return "Basic Constraints"; }
}
public int PathLenConstraint {
get { return pathLenConstraint; }
set {
if (value < NoPathLengthConstraint) {
string msg = Locale.GetText ("PathLenConstraint must be positive or -1 for none ({0}).", value);
throw new ArgumentOutOfRangeException (msg);
}
pathLenConstraint = value;
}
}
public override string ToString ()
{
StringBuilder sb = new StringBuilder ();
sb.Append ("Subject Type=");
sb.Append ((cA) ? "CA" : "End Entity");
sb.Append (Environment.NewLine);
sb.Append ("Path Length Constraint=");
if (pathLenConstraint == NoPathLengthConstraint)
sb.Append ("None");
else
sb.Append (pathLenConstraint.ToString (CultureInfo.InvariantCulture));
sb.Append (Environment.NewLine);
return sb.ToString ();
}
}
}
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