/// <summary>
/// Compares two sids to see if their prefixes are the same. The sids must have the same number of subauthorities.
/// </summary>
/// <param name="sid">The sid to compare against</param>
/// <returns>True if the sids share a prefix.</returns>
public bool EqualPrefix(Sid sid)
{
using (SafeSidBufferHandle sid1 = ToSafeBuffer(), sid2 = sid.ToSafeBuffer())
{
return(NtRtl.RtlEqualPrefixSid(sid1, sid2));
}
}
private void AddIntegrityLevel(Sid sid)
{
using (SafeSidBufferHandle sid_buffer = sid.ToSafeBuffer())
{
NtRtl.RtlAddIntegrityLabelToBoundaryDescriptor(ref _boundary_descriptor, sid_buffer).ToNtException();
}
}
/// <summary>
/// Convert to a managed byte array.
/// </summary>
/// <returns>The managed byte array.</returns>
public byte[] ToArray()
{
using (SafeSidBufferHandle handle = ToSafeBuffer())
{
return(NtObjectUtils.SafeHandleToArray(handle, handle.Length));
}
}
/// <summary>
/// Add a SID to the boundary descriptor.
/// </summary>
/// <remarks>This SID is used in an access check when creating or deleting private namespaces.</remarks>
/// <param name="sid">The SID to add.</param>
public void AddSid(Sid sid)
{
using (SafeSidBufferHandle sid_buffer = sid.ToSafeBuffer())
{
NtRtl.RtlAddSIDToBoundaryDescriptor(ref _boundary_descriptor, sid_buffer).ToNtException();
}
}
/// <summary>
/// Convert to an SDDL format string.
/// </summary>
/// <returns>The SDDL format string (e.g. S-1-1-0)</returns>
public override string ToString()
{
using (SafeSidBufferHandle sid = ToSafeBuffer())
{
UnicodeStringOut str = new UnicodeStringOut();
NtRtl.RtlConvertSidToUnicodeString(ref str, sid.DangerousGetHandle(), true).ToNtException();
try
{
return(str.ToString());
}
finally
{
NtRtl.RtlFreeUnicodeString(ref str);
}
}
}
/// <summary>
/// Looks up the account name of a SID.
/// </summary>
/// <param name="sid">The SID to lookup</param>
/// <returns>The name, or null if the lookup failed</returns>
public static string LookupAccountSid(Sid sid)
{
using (SafeSidBufferHandle sid_buffer = sid.ToSafeBuffer())
{
StringBuilder name = new StringBuilder(1024);
int length = name.Capacity;
StringBuilder domain = new StringBuilder(1024);
int domain_length = domain.Capacity;
if (!Win32NativeMethods.LookupAccountSid(null, sid_buffer, name,
ref length, domain, ref domain_length, out SidNameUse name_use))
{
return(null);
}
if (domain_length == 0)
{
return(name.ToString());
}
else
{
return($@"{domain}\{name}");
}
}
}
/// <summary>
/// Looks up the account name of a SID.
/// </summary>
/// <param name="sid">The SID to lookup</param>
/// <returns>The name, or null if the lookup failed</returns>
public static string LookupAccountSid(Sid sid)
{
using (SafeSidBufferHandle sid_buffer = sid.ToSafeBuffer())
{
StringBuilder name = new StringBuilder(1024);
int length = name.Capacity;
StringBuilder domain = new StringBuilder(1024);
int domain_length = domain.Capacity;
SidNameUse name_use;
if (!LookupAccountSid(null, sid_buffer, name, ref length, domain, ref domain_length, out name_use))
{
return(null);
}
if (domain_length == 0)
{
return(name.ToString());
}
else
{
return(String.Format("{0}\\{1}", domain, name));
}
}
}
/// <summary>
/// Constructor from a safe SID handle.
/// </summary>
/// <param name="sid">A safe SID handle containing a valid SID.</param>
/// <exception cref="NtException">Thrown if the buffer is not valid.</exception>
public Sid(SafeSidBufferHandle sid)
: this(sid.DangerousGetHandle())
{
}
public static extern bool RtlEqualPrefixSid(SafeSidBufferHandle Sid1, SafeSidBufferHandle Sid2);
public static extern NtStatus RtlAllocateAndInitializeSidEx(SidIdentifierAuthority IdentifierAuthority,
byte SubAuthorityCount, [Out] uint[] SubAuthorities, out SafeSidBufferHandle Sid);
public static extern NtStatus RtlAllocateAndInitializeSid(SidIdentifierAuthority IdentifierAuthority,
byte SubAuthorityCount, uint SubAuthority0, uint SubAuthority1, uint SubAuthority2, uint SubAuthority3,
uint SubAuthority4, uint SubAuthority5, uint SubAuthority6, uint SubAuthority7, out SafeSidBufferHandle Sid);
public static extern NtStatus RtlAddIntegrityLabelToBoundaryDescriptor(ref IntPtr BoundaryDescriptor, SafeSidBufferHandle RequiredSid);
/// <summary>
/// Convert security descriptor to a byte array
/// </summary>
/// <returns>The binary security descriptor</returns>
public byte[] ToByteArray()
{
SafeStructureInOutBuffer <SecurityDescriptorStructure> sd_buffer = null;
SafeHGlobalBuffer dacl_buffer = null;
SafeHGlobalBuffer sacl_buffer = null;
SafeSidBufferHandle owner_buffer = null;
SafeSidBufferHandle group_buffer = null;
try
{
sd_buffer = new SafeStructureInOutBuffer <SecurityDescriptorStructure>();
NtRtl.RtlCreateSecurityDescriptor(sd_buffer, Revision).ToNtException();
SecurityDescriptorControl control = Control & SecurityDescriptorControl.ValidControlSetMask;
NtRtl.RtlSetControlSecurityDescriptor(sd_buffer, control, control).ToNtException();
if (Dacl != null)
{
if (!Dacl.NullAcl)
{
dacl_buffer = new SafeHGlobalBuffer(Dacl.ToByteArray());
}
else
{
dacl_buffer = new SafeHGlobalBuffer(IntPtr.Zero, 0, false);
}
NtRtl.RtlSetDaclSecurityDescriptor(sd_buffer, true, dacl_buffer.DangerousGetHandle(), Dacl.Defaulted).ToNtException();
}
if (Sacl != null)
{
if (!Sacl.NullAcl)
{
sacl_buffer = new SafeHGlobalBuffer(Sacl.ToByteArray());
}
else
{
sacl_buffer = new SafeHGlobalBuffer(IntPtr.Zero, 0, false);
}
NtRtl.RtlSetSaclSecurityDescriptor(sd_buffer, true, sacl_buffer.DangerousGetHandle(), Sacl.Defaulted).ToNtException();
}
if (Owner != null)
{
owner_buffer = Owner.Sid.ToSafeBuffer();
NtRtl.RtlSetOwnerSecurityDescriptor(sd_buffer, owner_buffer.DangerousGetHandle(), Owner.Defaulted);
}
if (Group != null)
{
group_buffer = Group.Sid.ToSafeBuffer();
NtRtl.RtlSetGroupSecurityDescriptor(sd_buffer, group_buffer.DangerousGetHandle(), Group.Defaulted);
}
int total_length = 0;
NtStatus status = NtRtl.RtlAbsoluteToSelfRelativeSD(sd_buffer, new SafeHGlobalBuffer(IntPtr.Zero, 0, false), ref total_length);
if (status != NtStatus.STATUS_BUFFER_TOO_SMALL)
{
status.ToNtException();
}
using (SafeHGlobalBuffer relative_sd = new SafeHGlobalBuffer(total_length))
{
NtRtl.RtlAbsoluteToSelfRelativeSD(sd_buffer, relative_sd, ref total_length).ToNtException();
return(relative_sd.ToArray());
}
}
finally
{
sd_buffer?.Close();
dacl_buffer?.Close();
sacl_buffer?.Close();
owner_buffer?.Close();
group_buffer?.Close();
}
}
static extern bool LookupAccountSid(string lpSystemName, SafeSidBufferHandle lpSid, StringBuilder lpName,
ref int cchName, StringBuilder lpReferencedDomainName, ref int cchReferencedDomainName, out SidNameUse peUse);
