private void validateCertificates(X509CertificateCollection certificates)
{
ServerContext context = (ServerContext)this.Context;
AlertDescription description = AlertDescription.BadCertificate;
SSCX.X509Certificate client = null;
int[] certificateErrors = null;
// note: certificate may be null is no certificate is sent
// (e.g. optional mutual authentication)
if (certificates.Count > 0)
{
X509Certificate leaf = certificates[0];
ArrayList errors = new ArrayList();
// SSL specific check - not all certificates can be
// used to server-side SSL some rules applies after
// all ;-)
if (!checkCertificateUsage(leaf))
{
// WinError.h CERT_E_PURPOSE 0x800B0106
errors.Add((int)-2146762490);
}
X509Chain verify;
// was a chain supplied ? if so use it, if not
if (certificates.Count > 1)
{
// if so use it (and don't build our own)
X509CertificateCollection chain = new X509CertificateCollection(certificates);
chain.Remove(leaf);
verify = new X509Chain(chain);
}
else
{
// if not, then let's build our own (based on what's available in the stores)
verify = new X509Chain();
}
bool result = false;
try
{
result = verify.Build(leaf);
}
catch (Exception)
{
result = false;
}
if (!result)
{
switch (verify.Status)
{
case X509ChainStatusFlags.InvalidBasicConstraints:
// WinError.h TRUST_E_BASIC_CONSTRAINTS 0x80096019
errors.Add((int)-2146869223);
break;
case X509ChainStatusFlags.NotSignatureValid:
// WinError.h TRUST_E_BAD_DIGEST 0x80096010
errors.Add((int)-2146869232);
break;
case X509ChainStatusFlags.NotTimeNested:
// WinError.h CERT_E_VALIDITYPERIODNESTING 0x800B0102
errors.Add((int)-2146762494);
break;
case X509ChainStatusFlags.NotTimeValid:
// WinError.h CERT_E_EXPIRED 0x800B0101
description = AlertDescription.CertificateExpired;
errors.Add((int)-2146762495);
break;
case X509ChainStatusFlags.PartialChain:
// WinError.h CERT_E_CHAINING 0x800B010A
description = AlertDescription.UnknownCA;
errors.Add((int)-2146762486);
break;
case X509ChainStatusFlags.UntrustedRoot:
// WinError.h CERT_E_UNTRUSTEDROOT 0x800B0109
description = AlertDescription.UnknownCA;
errors.Add((int)-2146762487);
break;
default:
// unknown error
description = AlertDescription.CertificateUnknown;
errors.Add((int)verify.Status);
break;
}
}
client = new SSCX.X509Certificate(leaf.RawData);
certificateErrors = (int[])errors.ToArray(typeof(int));
}
else
{
certificateErrors = new int[0];
}
SSCX.X509CertificateCollection certCollection = new SSCX.X509CertificateCollection();
foreach (X509Certificate certificate in certificates)
{
certCollection.Add(new SSCX.X509Certificate(certificate.RawData));
}
if (!context.SslStream.RaiseClientCertificateValidation(client, certificateErrors))
{
throw new TlsException(
description,
"Invalid certificate received from client.");
}
this.Context.ClientSettings.ClientCertificate = client;
}
private void validateCertificates(X509CertificateCollection certificates)
{
ClientContext context = (ClientContext)this.Context;
AlertDescription description = AlertDescription.BadCertificate;
#if NET_2_0
if (context.SslStream.HaveRemoteValidation2Callback)
{
ValidationResult res = context.SslStream.RaiseServerCertificateValidation2(certificates);
if (res.Trusted)
{
return;
}
long error = res.ErrorCode;
switch (error)
{
case 0x800B0101:
description = AlertDescription.CertificateExpired;
break;
case 0x800B010A:
description = AlertDescription.UnknownCA;
break;
case 0x800B0109:
description = AlertDescription.UnknownCA;
break;
default:
description = AlertDescription.CertificateUnknown;
break;
}
string err = String.Format("0x{0:x}", error);
throw new TlsException(description, "Invalid certificate received from server. Error code: " + err);
}
#endif
// the leaf is the web server certificate
X509Certificate leaf = certificates [0];
X509Cert.X509Certificate cert = new X509Cert.X509Certificate(leaf.RawData);
ArrayList errors = new ArrayList();
// SSL specific check - not all certificates can be
// used to server-side SSL some rules applies after
// all ;-)
if (!checkCertificateUsage(leaf))
{
// WinError.h CERT_E_PURPOSE 0x800B0106
errors.Add((int)-2146762490);
}
// SSL specific check - does the certificate match
// the host ?
if (!checkServerIdentity(leaf))
{
// WinError.h CERT_E_CN_NO_MATCH 0x800B010F
errors.Add((int)-2146762481);
}
// Note: building and verifying a chain can take much time
// so we do it last (letting simple things fails first)
// Note: In TLS the certificates MUST be in order (and
// optionally include the root certificate) so we're not
// building the chain using LoadCertificate (it's faster)
// Note: IIS doesn't seem to send the whole certificate chain
// but only the server certificate :-( it's assuming that you
// already have this chain installed on your computer. duh!
// http://groups.google.ca/groups?q=IIS+server+certificate+chain&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=85058s%24avd%241%40nnrp1.deja.com&rnum=3
// we must remove the leaf certificate from the chain
X509CertificateCollection chain = new X509CertificateCollection(certificates);
chain.Remove(leaf);
X509Chain verify = new X509Chain(chain);
bool result = false;
try
{
result = verify.Build(leaf);
}
catch (Exception)
{
result = false;
}
if (!result)
{
switch (verify.Status)
{
case X509ChainStatusFlags.InvalidBasicConstraints:
// WinError.h TRUST_E_BASIC_CONSTRAINTS 0x80096019
errors.Add((int)-2146869223);
break;
case X509ChainStatusFlags.NotSignatureValid:
// WinError.h TRUST_E_BAD_DIGEST 0x80096010
errors.Add((int)-2146869232);
break;
case X509ChainStatusFlags.NotTimeNested:
// WinError.h CERT_E_VALIDITYPERIODNESTING 0x800B0102
errors.Add((int)-2146762494);
break;
case X509ChainStatusFlags.NotTimeValid:
// WinError.h CERT_E_EXPIRED 0x800B0101
description = AlertDescription.CertificateExpired;
errors.Add((int)-2146762495);
break;
case X509ChainStatusFlags.PartialChain:
// WinError.h CERT_E_CHAINING 0x800B010A
description = AlertDescription.UnknownCA;
errors.Add((int)-2146762486);
break;
case X509ChainStatusFlags.UntrustedRoot:
// WinError.h CERT_E_UNTRUSTEDROOT 0x800B0109
description = AlertDescription.UnknownCA;
errors.Add((int)-2146762487);
break;
default:
// unknown error
description = AlertDescription.CertificateUnknown;
errors.Add((int)verify.Status);
break;
}
}
int[] certificateErrors = (int[])errors.ToArray(typeof(int));
if (!context.SslStream.RaiseServerCertificateValidation(
cert,
certificateErrors))
{
throw new TlsException(
description,
"Invalid certificate received from server.");
}
}