2 // BasicConstraintsExtension.cs: Handles X.509 BasicConstrains extensions.
5 // Sebastien Pouliot <sebastien@ximian.com>
7 // (C) 2003 Motus Technologies Inc. (http://www.motus.com)
8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System
.Globalization
;
35 using Mono
.Security
.X509
;
37 namespace Mono
.Security
.X509
.Extensions
{
40 // 1. RFC 3280: Internet X.509 Public Key Infrastructure, Section 4.2.1.10
41 // http://www.ietf.org/rfc/rfc3280.txt
43 /* id-ce-basicConstraints OBJECT IDENTIFIER ::= { id-ce 19 }
45 * BasicConstraints ::= SEQUENCE {
46 * cA BOOLEAN DEFAULT FALSE,
47 * pathLenConstraint INTEGER (0..MAX) OPTIONAL
50 #if INSIDE_CORLIB || INSIDE_SYSTEM
55 class BasicConstraintsExtension
: X509Extension
{
57 public const int NoPathLengthConstraint
= -1;
60 private int pathLenConstraint
;
62 public BasicConstraintsExtension () : base ()
64 extnOid
= "2.5.29.19";
65 pathLenConstraint
= NoPathLengthConstraint
;
68 public BasicConstraintsExtension (ASN1 asn1
) : base (asn1
) {}
70 public BasicConstraintsExtension (X509Extension extension
) : base (extension
) {}
72 protected override void Decode ()
76 pathLenConstraint
= NoPathLengthConstraint
;
78 ASN1 sequence
= new ASN1 (extnValue
.Value
);
79 if (sequence
.Tag
!= 0x30)
80 throw new ArgumentException ("Invalid BasicConstraints extension");
82 ASN1 a
= sequence
[n
++];
83 if ((a
!= null) && (a
.Tag
== 0x01)) {
84 cA
= (a
.Value
[0] == 0xFF);
87 if ((a
!= null) && (a
.Tag
== 0x02))
88 pathLenConstraint
= ASN1Convert
.ToInt32 (a
);
91 protected override void Encode ()
93 ASN1 seq
= new ASN1 (0x30);
95 seq
.Add (new ASN1 (0x01, new byte[] { 0xFF }
));
96 // CAs MUST NOT include the pathLenConstraint field unless the cA boolean is asserted
97 if (cA
&& (pathLenConstraint
>= 0))
98 seq
.Add (ASN1Convert
.FromInt32 (pathLenConstraint
));
100 extnValue
= new ASN1 (0x04);
104 public bool CertificateAuthority
{
109 public override string Name
{
110 get { return "Basic Constraints"; }
113 public int PathLenConstraint
{
114 get { return pathLenConstraint; }
116 if (value < NoPathLengthConstraint
) {
117 string msg
= Locale
.GetText ("PathLenConstraint must be positive or -1 for none ({0}).", value);
118 throw new ArgumentOutOfRangeException (msg
);
120 pathLenConstraint
= value;
124 public override string ToString ()
126 StringBuilder sb
= new StringBuilder ();
127 sb
.Append ("Subject Type=");
128 sb
.Append ((cA
) ? "CA" : "End Entity");
129 sb
.Append (Environment
.NewLine
);
130 sb
.Append ("Path Length Constraint=");
131 if (pathLenConstraint
== NoPathLengthConstraint
)
134 sb
.Append (pathLenConstraint
.ToString (CultureInfo
.InvariantCulture
));
135 sb
.Append (Environment
.NewLine
);
136 return sb
.ToString ();