HttpClientCertificate.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / HttpClientCertificate.cs / 1 / HttpClientCertificate.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * Client Certificate 
 *
 * Copyright (c) 2000 Microsoft Corporation 
 */

namespace System.Web {
    using System.Collections; 
    using System.Collections.Specialized;
    using System.Globalization; 
    using System.Security.Permissions; 
    using System.Web.Util;
 

    /// 
    ///    The HttpClientCertificate collection retrieves the certification fields
    ///       (specified in the X.509 standard) from a request issued by the Web browser. 
    ///    If a Web browser uses the SSL3.0/PCT1 protocol (in other words, it uses a URL
    ///       starting with https:// instead of http://) to connect to a server and the server 
    ///       requests certification, the browser sends the certification fields. 
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public class HttpClientCertificate  : NameValueCollection {
        /////////////////////////////////////////////////////////////////////////////
        // Properties 

        ///  
        ///    [To be supplied.] 
        /// 
        public    String    Cookie { get { return _Cookie;}} 

        /// 
        /// A string containing the binary stream of the entire certificate content in ASN.1 format.
        ///  
        public    byte []   Certificate { get { return _Certificate;}}
 
        ///  
        ///    A set of flags that provide additional client certificate information. 
        ///  
        public    int       Flags { get { return _Flags;}}

        /// 
        ///    [To be supplied.] 
        /// 
        public    int       KeySize { get { return _KeySize;}} 
 
        /// 
        ///    [To be supplied.] 
        /// 
        public    int       SecretKeySize { get { return _SecretKeySize;}}

        ///  
        ///    A string that contains a list of subfield values containing information about
        ///       the issuer of the certificate. 
        ///  
        public    String    Issuer { get { return _Issuer;}}
 
        /// 
        ///    [To be supplied.]
        /// 
        public    String    ServerIssuer { get { return _ServerIssuer;}} 

        ///  
        ///    A string that contains a list of subfield values. The subfield values contain 
        ///       information about the subject of the certificate. If this value is specified
        ///       without a , the ClientCertificate collection returns a 
        ///       comma-separated list of subfields. For example, C=US, O=Msft, and so on.
        /// 
        public    String    Subject { get { return _Subject;}}
 
        /// 
        ///    [To be supplied.] 
        ///  
        public    String    ServerSubject { get { return _ServerSubject;}}
 
        /// 
        ///    A string that contains the certification serial number as an ASCII
        ///       representation of hexadecimal bytes separated by hyphens (-). For example,
        ///       04-67-F3-02. 
        /// 
        public    String    SerialNumber { get { return _SerialNumber;}} 
 
        /// 
        ///    A date specifying when the certificate becomes valid. This date varies with 
        ///       international settings. 
        /// 
        public    DateTime  ValidFrom { get { return _ValidFrom;}}
 
        /// 
        ///    A date specifying when the certificate expires. The year value is displayed 
        ///       as a four-digit number. 
        /// 
        public    DateTime  ValidUntil { get { return _ValidUntil;}} 


        /// 
        ///    [To be supplied.] 
        /// 
        public    int       CertEncoding    { get { return _CertEncoding;}} 
 
        /// 
        ///    [To be supplied.] 
        /// 
        public    byte []   PublicKey       { get { return _PublicKey;}}

        ///  
        ///    [To be supplied.]
        ///  
        public    byte []   BinaryIssuer    { get { return _BinaryIssuer;}} 

 
        /// 
        ///    [To be supplied.]
        /// 
        public    bool      IsPresent       { get { return((_Flags & 0x1) == 1);}} 

        ///  
        ///    [To be supplied.] 
        /// 
        public    bool      IsValid         { get { return((_Flags & 0x2) == 0);}} 

        /////////////////////////////////////////////////////////////////////////////
        // Ctor
        internal HttpClientCertificate(HttpContext context) { 
            String flags    = context.Request.ServerVariables["CERT_FLAGS"];
            if (!String.IsNullOrEmpty(flags)) 
                _Flags = Int32.Parse(flags, CultureInfo.InvariantCulture); 
            else
                _Flags = 0; 

            if (IsPresent == false)
                return;
 

            _Cookie         = context.Request.ServerVariables["CERT_COOKIE"]; 
            _Issuer         = context.Request.ServerVariables["CERT_ISSUER"]; 
            _ServerIssuer   = context.Request.ServerVariables["CERT_SERVER_ISSUER"];
            _Subject        = context.Request.ServerVariables["CERT_SUBJECT"]; 
            _ServerSubject  = context.Request.ServerVariables["CERT_SERVER_SUBJECT"];
            _SerialNumber   = context.Request.ServerVariables["CERT_SERIALNUMBER"];

            _Certificate    = context.WorkerRequest.GetClientCertificate(); 
            _ValidFrom      = context.WorkerRequest.GetClientCertificateValidFrom();
            _ValidUntil     = context.WorkerRequest.GetClientCertificateValidUntil(); 
            _BinaryIssuer   = context.WorkerRequest.GetClientCertificateBinaryIssuer(); 
            _PublicKey      = context.WorkerRequest.GetClientCertificatePublicKey();
            _CertEncoding   = context.WorkerRequest.GetClientCertificateEncoding(); 

            String keySize  = context.Request.ServerVariables["CERT_KEYSIZE"];
            String skeySize = context.Request.ServerVariables["CERT_SECRETKEYSIZE"];
 
            if (!String.IsNullOrEmpty(keySize))
                _KeySize = Int32.Parse(keySize, CultureInfo.InvariantCulture); 
            if (!String.IsNullOrEmpty(skeySize)) 
                _SecretKeySize = Int32.Parse(skeySize, CultureInfo.InvariantCulture);
 
            base.Add("ISSUER",        null);
            base.Add("SUBJECTEMAIL", null);
            base.Add("BINARYISSUER", null);
            base.Add("FLAGS",         null); 
            base.Add("ISSUERO",       null);
            base.Add("PUBLICKEY",     null); 
            base.Add("ISSUEROU",      null); 
            base.Add("ENCODING",      null);
            base.Add("ISSUERCN",      null); 
            base.Add("SERIALNUMBER",  null);
            base.Add("SUBJECT",       null);
            base.Add("SUBJECTCN",     null);
            base.Add("CERTIFICATE",   null); 
            base.Add("SUBJECTO",      null);
            base.Add("SUBJECTOU",     null); 
            base.Add("VALIDUNTIL",    null); 
            base.Add("VALIDFROM",     null);
        } 


        /// 
        ///    Allows access to individual items in the collection by name. 
        /// 
        public override String Get(String field) 
        { 
            if (field == null)
                return String.Empty; 

            field = field.ToLower(CultureInfo.InvariantCulture);

            switch (field) { 
                case "cookie":
                    return Cookie; 
 
                case "flags":
                    return Flags.ToString("G", CultureInfo.InvariantCulture); 

                case "keysize":
                    return KeySize.ToString("G", CultureInfo.InvariantCulture);
 
                case "secretkeysize":
                    return SecretKeySize.ToString(CultureInfo.InvariantCulture); 
 
                case "issuer":
                    return Issuer; 

                case "serverissuer":
                    return ServerIssuer;
 
                case "subject":
                    return Subject; 
 
                case "serversubject":
                    return ServerSubject; 

                case "serialnumber":
                    return SerialNumber;
 
                case "certificate":
                    return System.Text.Encoding.Default.GetString(Certificate); 
 
                case "binaryissuer":
                    return System.Text.Encoding.Default.GetString(BinaryIssuer); 

                case "publickey":
                    return System.Text.Encoding.Default.GetString(PublicKey);
 
                case "encoding":
                    return CertEncoding.ToString("G", CultureInfo.InvariantCulture); 
 
                case "validfrom":
                    return HttpUtility.FormatHttpDateTime(ValidFrom); 

                case "validuntil":
                    return HttpUtility.FormatHttpDateTime(ValidUntil);
            } 

            if (StringUtil.StringStartsWith(field, "issuer")) 
                return ExtractString(Issuer, field.Substring(6)); 

            if (StringUtil.StringStartsWith(field, "subject")) { 
                if (field.Equals("subjectemail"))
                    return ExtractString(Subject, "e");
                else
                    return ExtractString(Subject, field.Substring(7)); 
            }
 
            if (StringUtil.StringStartsWith(field, "serversubject")) 
                return ExtractString(ServerSubject, field.Substring(13));
 
            if (StringUtil.StringStartsWith(field, "serverissuer"))
                return ExtractString(ServerIssuer, field.Substring(12));

            return String.Empty; 
        }
 
        ///////////////////////////////////////////////////////////////////////////// 
        // Private data
        private    String    _Cookie              = String.Empty; 
        private    byte []   _Certificate         = new byte[0];
        private    int       _Flags;
        private    int       _KeySize;
        private    int       _SecretKeySize; 
        private    String    _Issuer              = String.Empty;
        private    String    _ServerIssuer        = String.Empty; 
        private    String    _Subject             = String.Empty; 
        private    String    _ServerSubject       = String.Empty;
        private    String    _SerialNumber        = String.Empty; 
        private    DateTime  _ValidFrom           = DateTime.Now;
        private    DateTime  _ValidUntil          = DateTime.Now;
        private    int       _CertEncoding;
        private    byte []   _PublicKey           = new byte[0]; 
        private    byte []   _BinaryIssuer        = new byte[0];
 
        private String ExtractString(String strAll, String strSubject) { 
            if (strAll == null || strSubject == null)
                return String.Empty; 

            String strReturn = String.Empty;
            int    iStart    = 0;
            String strAllL   = strAll.ToLower(CultureInfo.InvariantCulture); 

            while (iStart < strAllL.Length) { 
                iStart = strAllL.IndexOf(strSubject + "=", iStart, StringComparison.Ordinal); 
                if (iStart < 0)
                    return strReturn; 
                if (strReturn.Length > 0)
                    strReturn += ";";

                iStart += strSubject.Length + 1; 
                int iEnd = 0;
                if (strAll[iStart]=='"') { 
                    iStart++; 
                    iEnd  = strAll.IndexOf('"' , iStart);
                } 
                else
                    iEnd  = strAll.IndexOf(',' , iStart);

                if (iEnd < 0) 
                    iEnd = strAll.Length;
 
                strReturn += strAll.Substring(iStart, iEnd - iStart); 
                iStart = iEnd + 1;
            } 

            return strReturn;
        }
    } 
}
                        

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