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// **********************************************************************
//
// Copyright (c) 2003-2007 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
namespace IceSSL
{
using System;
using System.Collections;
using System.Diagnostics;
using System.Security.Cryptography.X509Certificates;
sealed class TrustManager
{
internal TrustManager(Ice.Communicator communicator)
{
Debug.Assert(communicator != null);
communicator_ = communicator;
Ice.Properties properties = communicator.getProperties();
traceLevel_ = properties.getPropertyAsInt("IceSSL.Trace.Security");
string key = null;
try
{
key = "IceSSL.TrustOnly";
all_ = parse(properties.getProperty(key));
key = "IceSSL.TrustOnly.Client";
client_ = parse(properties.getProperty(key));
key = "IceSSL.TrustOnly.Server";
allServer_ = parse(properties.getProperty(key));
Ice.PropertyDict dict = properties.getPropertiesForPrefix("IceSSL.TrustOnly.Server.");
foreach (DictionaryEntry entry in dict)
{
string dkey = (string)entry.Key;
string dname = dkey.Substring("IceSSL.TrustOnly.Server.".Length);
server_[dname] = parse((string)entry.Value);
}
}
catch(RFC2253.ParseException e)
{
Ice.PluginInitializationException ex = new Ice.PluginInitializationException();
ex.reason = "IceSSL: invalid property " + key + ":\n" + e.reason;
throw ex;
}
}
internal bool
verify(ConnectionInfo info)
{
ArrayList trustset = new ArrayList();
if(all_.Count != 0)
{
trustset.Add(all_);
}
if(info.incoming)
{
if(allServer_.Count != 0)
{
trustset.Add(allServer_);
}
if(info.adapterName.Length > 0)
{
ArrayList p = (ArrayList)server_[info.adapterName];
if(p != null)
{
trustset.Add(p);
}
}
}
else
{
if(client_.Count != 0)
{
trustset.Add(client_);
}
}
//
// If there is nothing to match against, then we accept the cert.
//
if(trustset.Count == 0)
{
return true;
}
//
// If there is no certificate then we match false.
//
if(info.certs.Length != 0)
{
X500DistinguishedName subjectDN = info.certs[0].SubjectName;
string subjectName = subjectDN.Name;
Debug.Assert(subjectName != null);
try
{
//
// Decompose the subject DN into the RDNs.
//
if(traceLevel_ > 0)
{
if(info.incoming)
{
communicator_.getLogger().trace("Security", "trust manager evaluating client:\n" +
"subject = " + subjectName + "\n" +
"adapter = " + info.adapterName + "\n" +
"local addr = " + IceInternal.Network.addrToString(info.localAddr) + "\n" +
"remote addr = " + IceInternal.Network.addrToString(info.remoteAddr));
}
else
{
communicator_.getLogger().trace("Security", "trust manager evaluating server:\n" +
"subject = " + subjectName + "\n" +
"local addr = " + IceInternal.Network.addrToString(info.localAddr) + "\n" +
"remote addr = " + IceInternal.Network.addrToString(info.remoteAddr));
}
}
ArrayList dn = RFC2253.parseStrict(subjectName);
//
// Unescape the DN. Note that this isn't done in
// the parser in order to keep the various RFC2253
// implementations as close as possible.
//
for(int i = 0; i < dn.Count; ++i)
{
RFC2253.RDNPair p = (RFC2253.RDNPair)dn[i];
p.value = RFC2253.unescape(p.value);
dn[i] = p;
}
//
// Try matching against everything in the trust set.
//
foreach(ArrayList matchSet in trustset)
{
if(traceLevel_ > 0)
{
string s = "trust manager matching PDNs:\n";
bool addSemi = false;
foreach(ArrayList rdnSet in matchSet)
{
if(addSemi)
{
s += ';';
}
addSemi = true;
bool addComma = false;
foreach(RFC2253.RDNPair rdn in rdnSet)
{
if(addComma)
{
s += ',';
}
addComma = true;
s += rdn.key;
s += '=';
s += rdn.value;
}
}
communicator_.getLogger().trace("Security", s);
}
if(match(matchSet, dn))
{
return true;
}
}
}
catch(RFC2253.ParseException e)
{
communicator_.getLogger().warning(
"IceSSL: unable to parse certificate DN `" + subjectName + "'\nreason: " + e.reason);
}
}
return false;
}
private bool
match(ArrayList matchSet, ArrayList subject)
{
foreach(ArrayList item in matchSet)
{
if(matchRDNs(item, subject))
{
return true;
}
}
return false;
}
private bool
matchRDNs(ArrayList match, ArrayList subject)
{
foreach(RFC2253.RDNPair matchRDN in match)
{
bool found = false;
foreach(RFC2253.RDNPair subjectRDN in subject)
{
if(matchRDN.key.Equals(subjectRDN.key))
{
found = true;
if(!matchRDN.value.Equals(subjectRDN.value))
{
return false;
}
}
}
if(!found)
{
return false;
}
}
return true;
}
// Note that unlike the C++ & Java implementation this returns unescaped data.
ArrayList
parse(string value)
{
//
// As with the Java implementation, the DN that comes from
// the X500DistinguishedName does not necessarily match
// the user's input form. Therefore we need to normalize the
// data to match the C# forms.
//
ArrayList l = RFC2253.parse(value);
for(int i = 0; i < l.Count; ++i)
{
ArrayList dn = (ArrayList)l[i];
for(int j = 0; j < dn.Count; ++j)
{
RFC2253.RDNPair pair = (RFC2253.RDNPair)dn[j];
// Normalize the RDN key.
if (pair.key == "emailAddress")
{
pair.key = "E";
}
else if (pair.key == "ST")
{
pair.key = "S";
}
// Unescape the value.
pair.value = RFC2253.unescape(pair.value);
dn[j] = pair;
}
}
return l;
}
private Ice.Communicator communicator_;
private int traceLevel_;
private ArrayList all_;
private ArrayList client_;
private ArrayList allServer_;
private Hashtable server_ = new Hashtable();
}
}
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