/// <summary>
/// Returns a list of all known security package providers and their properties.
/// </summary>
/// <returns></returns>
public static CSecPkgInfo[] EnumeratePackages()
{
CSecurityStatus status = CSecurityStatus.InternalError;
CSecPkgInfo[] packages = null;
IntPtr pkgArrayPtr;
IntPtr pkgPtr;
int numPackages = 0;
int pkgSize = Marshal.SizeOf(typeof(CSecPkgInfo));
pkgArrayPtr = new IntPtr();
RuntimeHelpers.PrepareConstrainedRegions();
try { }
finally
{
status = CNativeMethods.EnumerateSecurityPackages(ref numPackages, ref pkgArrayPtr);
if (pkgArrayPtr != IntPtr.Zero)
{
try
{
if (status == CSecurityStatus.OK)
{
// Bwooop Bwooop Alocation Alert
// 1) We allocate the array
// 2) We allocate the individual elements in the array (they're class objects).
// 3) We allocate the strings in the individual elements in the array when we
// call Marshal.PtrToStructure()
packages = new CSecPkgInfo[numPackages];
for (int i = 0; i < numPackages; i++)
{
packages[i] = new CSecPkgInfo();
}
for (int i = 0; i < numPackages; i++)
{
pkgPtr = IntPtr.Add(pkgArrayPtr, i * pkgSize);
Marshal.PtrToStructure(pkgPtr, packages[i]);
}
}
}
finally
{
CNativeMethods.FreeContextBuffer(pkgArrayPtr);
}
}
}
if (status != CSecurityStatus.OK)
{
throw new CSSPIException("Failed to enumerate security package providers", status);
}
return(packages);
}
/// <summary>
/// Returns the properties of the named package.
/// </summary>
/// <param name="packageName">The name of the package.</param>
/// <returns></returns>
public static CSecPkgInfo GetPackageCapabilities(string packageName)
{
CSecPkgInfo info;
CSecurityStatus status = CSecurityStatus.InternalError;
IntPtr rawInfoPtr;
rawInfoPtr = new IntPtr();
info = new CSecPkgInfo();
RuntimeHelpers.PrepareConstrainedRegions();
try
{ }
finally
{
status = CNativeMethods.QuerySecurityPackageInfo(packageName, ref rawInfoPtr);
if (rawInfoPtr != IntPtr.Zero)
{
try
{
if (status == CSecurityStatus.OK)
{
// This performs allocations as it makes room for the strings contained in the SecPkgInfo class.
Marshal.PtrToStructure(rawInfoPtr, info);
}
}
finally
{
CNativeMethods.FreeContextBuffer(rawInfoPtr);
}
}
}
if (status != CSecurityStatus.OK)
{
throw new CSSPIException("Failed to query security package provider details", status);
}
return(info);
}
