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using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
using System.Diagnostics.CodeAnalysis;
using System.Numerics;
using System.Runtime.InteropServices;
using System.Security.Cryptography.X509Certificates;
using System.Text.RegularExpressions;
namespace HyperBooru;
public static class WellKnownSid {
public static readonly SecurityIdentifier NullSid = new("S-1-0-0");
public static readonly SecurityIdentifier WorldSid = new("S-1-1-0");
public static readonly SecurityIdentifier LocalSid = new("S-1-2-0");
public static readonly SecurityIdentifier CreatorOwnerSid = new("S-1-3-0");
public static readonly SecurityIdentifier CreatorGroupSid = new("S-1-3-1");
private static readonly (string name, SecurityIdentifier sid)[] nameMap = new[] {
( "Everyone", WorldSid ),
( "LOCAL", LocalSid ),
( "CREATOR OWNER", CreatorGroupSid ),
( "CREATOR GROUP", CreatorGroupSid )
};
public static SecurityIdentifier? TranslateName(string name) {
try {
return nameMap
.First(x => x.name.ToLower() == name.ToLower().Trim())
.sid;
} catch(InvalidOperationException) {
return null;
}
}
public static string? TranslateSid(SecurityIdentifier sid) {
try {
return nameMap.First(x => x.sid == sid).name;
} catch(InvalidOperationException) {
return null;
}
}
}
public class SecurityIdentifier {
public SidStruct SidStruct { get; private init; }
private static readonly Regex SddlRegex =
new(@"^S(-[0-9]+){2,}$", RegexOptions.Compiled);
public SecurityIdentifier(string sddlForm) {
var match = SddlRegex.Match(sddlForm);
if(!match.Success)
throw new ArgumentException();
var values = match.Groups[1].Captures
.Select(v => uint.Parse(v.Value.Replace("-", "")))
.ToArray();
// Extremely roundabound way of converting a 32-bit
// integer to a 48-bit big-endian integer
byte[] identifierAuthority = BitConverter.GetBytes(values[1]);
if(BitConverter.IsLittleEndian)
Array.Reverse(identifierAuthority);
identifierAuthority = new byte[2]
.Concat(identifierAuthority)
.ToArray();
SidStruct = new SidStruct {
Revision = (byte) values[0],
SubAuthorityCount = (byte) (values.Count() - 2),
IdentifierAuthority = identifierAuthority,
SubAuthorities = values.Skip(2).ToArray()
};
}
public SecurityIdentifier(SidStruct sidStruct) =>
SidStruct = sidStruct;
public SecurityIdentifier(byte[] binaryForm) {
IntPtr p = IntPtr.Zero;
try {
p = Marshal.AllocHGlobal(binaryForm.Length);
Marshal.Copy(binaryForm, 0, p, binaryForm.Length);
SidStruct = Marshal.PtrToStructure<SidStruct>(p);
} finally {
Marshal.FreeHGlobal(p);
}
}
public byte[] BinaryForm {
get {
var size = Marshal.SizeOf(typeof(SidStruct));
byte[] array = new byte[size];
IntPtr p = IntPtr.Zero;
try {
p = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(SidStruct, p, true);
Marshal.Copy(p, array, 0, size);
} finally {
Marshal.FreeHGlobal(p);
}
return array;
}
}
public override string ToString() {
var identifierAuthority = new BigInteger(SidStruct.IdentifierAuthority, true, true);
var subAuthorities = string.Join('-',SidStruct.SubAuthorities.Select(sa => sa.ToString()));
if(!string.IsNullOrEmpty(subAuthorities))
subAuthorities = "-" + subAuthorities;
return $"S-{SidStruct.Revision}-{identifierAuthority}{subAuthorities}";
}
public static bool operator ==(SecurityIdentifier? x, SecurityIdentifier? y) =>
x?.SidStruct.Equals(y?.SidStruct) ?? false;
public static bool operator !=(SecurityIdentifier? x, SecurityIdentifier? y) =>
!(x == y);
public override bool Equals(object? obj) =>
obj is null ? false : this == (SecurityIdentifier) obj;
public override int GetHashCode() =>
SidStruct.GetHashCode();
}
[StructLayout(LayoutKind.Sequential)]
public struct SidStruct {
public byte Revision;
public byte SubAuthorityCount;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
public byte[] IdentifierAuthority;
[MarshalAs(UnmanagedType.ByValArray)]
public uint[] SubAuthorities;
public static bool operator ==(SidStruct? x, SidStruct? y) =>
x?.Equals(y) ?? false;
public static bool operator !=(SidStruct? x, SidStruct? y) =>
!(x == y);
public override bool Equals([NotNullWhen(true)] object? obj) {
if(obj is null || obj is not SidStruct)
return false;
var sid = (SidStruct) obj;
return
Revision == sid.Revision &&
SubAuthorityCount == sid.SubAuthorityCount &&
Enumerable.SequenceEqual(IdentifierAuthority, sid.IdentifierAuthority) &&
Enumerable.SequenceEqual(SubAuthorities, sid.SubAuthorities);
}
public override int GetHashCode() => (
Revision,
SubAuthorityCount,
IdentifierAuthority
.Select(v => (uint) v)
.Aggregate(0, (a, v) => HashCode.Combine(a, v)),
SubAuthorities
.Aggregate(0, (a, v) => HashCode.Combine(a, v)))
.GetHashCode();
}
public class SecurityIdentifierConverter : ValueConverter<SecurityIdentifier, byte[]> {
public SecurityIdentifierConverter()
: base(
v => v.BinaryForm,
v => new SecurityIdentifier(v)) {}
}
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