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Partially convert CD Check to section based; add notes

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This commit is contained in:
Matt Nadareski
2021-08-29 21:13:50 -07:00
parent 56ae245305
commit 6d78e2fff7
1 changed files with 47 additions and 8 deletions
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55
BurnOutSharp/ProtectionType/CDCheck.cs
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@@ -1,4 +1,7 @@
using System.Collections.Generic;
using System.Linq;
using System.Text;
using BurnOutSharp.ExecutableType.Microsoft;
using BurnOutSharp.Matching;
namespace BurnOutSharp.ProtectionType
@@ -8,22 +11,58 @@ namespace BurnOutSharp.ProtectionType
/// <inheritdoc/>
public List<ContentMatchSet> GetContentMatchSets()
{
// TODO: Obtain a sample to find where this string is in a typical executable
// TODO: Is this too broad in general? It _does_ indicate a CD check, but there's no real
// way of knowing how consistent it is
return new List<ContentMatchSet>
{
// MGS CDCheck
new ContentMatchSet(new byte?[]
{
0x4D, 0x47, 0x53, 0x20, 0x43, 0x44, 0x43, 0x68,
0x65, 0x63, 0x6B
}, "Microsoft Game Studios CD Check"),
// CDCheck
new ContentMatchSet(new byte?[] { 0x43, 0x44, 0x43, 0x68, 0x65, 0x63, 0x6B }, "Executable-Based CD Check"),
};
}
/// <inheritdoc/>
public string CheckContents(string file, byte[] fileContent, bool includeDebug = false) => null;
public string CheckContents(string file, byte[] fileContent, bool includeDebug = false)
{
// Get the sections from the executable, if possible
PortableExecutable pex = PortableExecutable.Deserialize(fileContent, 0);
var sections = pex?.SectionTable;
if (sections == null)
return null;
foreach (var section in sections)
{
string sectionName = Encoding.ASCII.GetString(section.Name).Trim('\0');
int sectionAddr = (int)section.PointerToRawData;
int sectionEnd = sectionAddr + (int)section.VirtualSize;
System.Console.WriteLine($"{sectionName}: {sectionAddr} -> {sectionEnd}");
}
// Get the .rdata section, if it exists
var rdataSection = sections.FirstOrDefault(s => Encoding.ASCII.GetString(s.Name).StartsWith(".rdata"));
if (rdataSection != null)
{
int sectionAddr = (int)rdataSection.PointerToRawData;
int sectionEnd = sectionAddr + (int)rdataSection.VirtualSize;
var matchers = new List<ContentMatchSet>
{
// MGS CDCheck
new ContentMatchSet(
new ContentMatch(new byte?[]
{
0x4D, 0x47, 0x53, 0x20, 0x43, 0x44, 0x43, 0x68,
0x65, 0x63, 0x6B
}, start: sectionAddr, end: sectionEnd),
"Microsoft Game Studios CD Check"),
};
string match = MatchUtil.GetFirstMatch(file, fileContent, matchers, includeDebug);
if (!string.IsNullOrWhiteSpace(match))
return match;
}
return null;
}
// These content checks are too broad to be useful
private static string CheckContentsBroad(string file, byte[] fileContent, bool includeDebug = false)