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MachO: Throw an exception if file is encrypted with FairPlay DRM

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This commit is contained in:
Katy Coe
2020-06-18 16:41:57 +02:00
parent d668cd3685
commit 08937ead3a
2 changed files with 22 additions and 2 deletions
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12
Il2CppInspector.Common/FileFormatReaders/FormatLayouts/MachO.cs
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@@ -1,5 +1,5 @@
/* /*
Copyright 2017-2019 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com Copyright 2017-2020 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
All rights reserved. All rights reserved.
*/ */
@@ -24,7 +24,9 @@ namespace Il2CppInspector
LC_SYMTAB = 0x2, LC_SYMTAB = 0x2,
LC_DYSYMTAB = 0xb, LC_DYSYMTAB = 0xb,
LC_SEGMENT_64 = 0x19, LC_SEGMENT_64 = 0x19,
LC_ENCRYPTION_INFO = 0x21,
LC_FUNCTION_STARTS = 0x26, LC_FUNCTION_STARTS = 0x26,
LC_ENCRYPTION_INFO_64 = 0x2C,
CPU_TYPE_X86 = 7, CPU_TYPE_X86 = 7,
CPU_TYPE_X86_64 = 0x01000000 + CPU_TYPE_X86, CPU_TYPE_X86_64 = 0x01000000 + CPU_TYPE_X86,
@@ -96,6 +98,14 @@ namespace Il2CppInspector
public uint StrSize; public uint StrSize;
} }
internal class MachOEncryptionInfo
{
// MachOLoadCommand
public uint CryptOffset;
public uint CryptSize;
public uint CryptID;
}
internal class MachO_nlist<TWord> where TWord : struct internal class MachO_nlist<TWord> where TWord : struct
{ {
public uint n_strx; public uint n_strx;

12
Il2CppInspector.Common/FileFormatReaders/MachOReader.cs
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@@ -1,5 +1,5 @@
/* /*
Copyright 2017-2019 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com Copyright 2017-2020 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
All rights reserved. All rights reserved.
*/ */
@@ -39,6 +39,7 @@ namespace Il2CppInspector
protected override bool checkMagicBE(MachO magic) => magic == MachO.MH_CIGAM_64; protected override bool checkMagicBE(MachO magic) => magic == MachO.MH_CIGAM_64;
protected override MachO lc_Segment => MachO.LC_SEGMENT_64; protected override MachO lc_Segment => MachO.LC_SEGMENT_64;
public override uint MapVATR(ulong uiAddr) { public override uint MapVATR(ulong uiAddr) {
var section = sections.First(x => uiAddr >= x.Address && uiAddr <= x.Address + x.Size); var section = sections.First(x => uiAddr >= x.Address && uiAddr <= x.Address + x.Size);
return (uint) (uiAddr - (section.Address - section.ImageOffset)); return (uint) (uiAddr - (section.Address - section.ImageOffset));
@@ -126,6 +127,15 @@ namespace Il2CppInspector
case MachO.LC_DYSYMTAB: case MachO.LC_DYSYMTAB:
// TODO: Implement Mach-O dynamic symbol table // TODO: Implement Mach-O dynamic symbol table
break; break;
// Encryption check
// If cryptid == 1, this binary is encrypted with FairPlay DRM
case MachO.LC_ENCRYPTION_INFO:
case MachO.LC_ENCRYPTION_INFO_64:
var encryptionInfo = ReadObject<MachOEncryptionInfo>();
if (encryptionInfo.CryptID != 0)
throw new NotImplementedException("This Mach-O executable is encrypted with FairPlay DRM and cannot be processed. Please provide a decrypted version of the executable.");
break;
} }
// There might be other data after the load command so always use the specified total size to step forwards // There might be other data after the load command so always use the specified total size to step forwards