public static bool ValidateExecutableSignature(MachObjectFile file, X509Certificate certificate)
{
byte[] codeSignatureBytes = file.GetCodeSignatureBytes();
if (CodeSignatureSuperBlob.IsCodeSignatureSuperBlob(codeSignatureBytes, 0))
{
CodeSignatureSuperBlob codeSignature = new CodeSignatureSuperBlob(codeSignatureBytes, 0);
CodeDirectoryBlob codeDirectory = codeSignature.GetEntry(CodeSignatureEntryType.CodeDirectory) as CodeDirectoryBlob;
CmsSignatureBlob cmsSignature = codeSignature.GetEntry(CodeSignatureEntryType.CmsSignature) as CmsSignatureBlob;
if (codeDirectory == null || cmsSignature == null)
{
return(false);
}
return(CMSHelper.ValidateSignature(codeDirectory.GetBytes(), cmsSignature.Data, certificate));
}
return(false);
}
public static bool ValidateSpecialHashes(MachObjectFile file, byte[] infoFileBytes, byte[] codeResourcesBytes)
{
byte[] codeSignatureBytes = file.GetCodeSignatureBytes();
if (CodeSignatureSuperBlob.IsCodeSignatureSuperBlob(codeSignatureBytes, 0))
{
CodeSignatureSuperBlob codeSignature = new CodeSignatureSuperBlob(codeSignatureBytes, 0);
CodeDirectoryBlob codeDirectory = codeSignature.GetEntry(CodeSignatureEntryType.CodeDirectory) as CodeDirectoryBlob;
byte[] infoFileHash = HashAlgorithmHelper.ComputeHash(codeDirectory.HashType, infoFileBytes);
if (!ByteUtils.AreByteArraysEqual(infoFileHash, codeDirectory.SpecialHashes[codeDirectory.SpecialHashes.Count - CodeDirectoryBlob.InfoFileHashOffset]))
{
return(false);
}
byte[] codeResourcesHash = HashAlgorithmHelper.ComputeHash(codeDirectory.HashType, codeResourcesBytes);
if (!ByteUtils.AreByteArraysEqual(codeResourcesHash, codeDirectory.SpecialHashes[codeDirectory.SpecialHashes.Count - CodeDirectoryBlob.CodeResourcesFileHashOffset]))
{
return(false);
}
CodeRequirementsBlob codeRequirements = codeSignature.GetEntry(CodeSignatureEntryType.Requirements) as CodeRequirementsBlob;
byte[] codeRequirementsBytes = codeRequirements.GetBytes();
byte[] codeRequirementsHash = HashAlgorithmHelper.ComputeHash(codeDirectory.HashType, codeRequirementsBytes);
if (!ByteUtils.AreByteArraysEqual(codeRequirementsHash, codeDirectory.SpecialHashes[codeDirectory.SpecialHashes.Count - CodeDirectoryBlob.RequirementsHashOffset]))
{
return(false);
}
if (codeDirectory.SpecialHashes.Count >= CodeDirectoryBlob.EntitlementsHashOffset)
{
CodeSignatureGenericBlob entitlements = codeSignature.GetEntry(CodeSignatureEntryType.Entitlements) as CodeSignatureGenericBlob;
byte[] entitlementsBytes = entitlements.GetBytes();
byte[] entitlementsHash = HashAlgorithmHelper.ComputeHash(codeDirectory.HashType, entitlementsBytes);
if (!ByteUtils.AreByteArraysEqual(entitlementsHash, codeDirectory.SpecialHashes[codeDirectory.SpecialHashes.Count - CodeDirectoryBlob.EntitlementsHashOffset]))
{
return(false);
}
}
return(true);
}
return(false);
}
public static bool ValidateExecutableHash(MachObjectFile file)
{
byte[] codeSignatureBytes = file.GetCodeSignatureBytes();
if (CodeSignatureSuperBlob.IsCodeSignatureSuperBlob(codeSignatureBytes, 0))
{
CodeSignatureSuperBlob codeSignature = new CodeSignatureSuperBlob(codeSignatureBytes, 0);
CodeDirectoryBlob codeDirectory = codeSignature.GetEntry(CodeSignatureEntryType.CodeDirectory) as CodeDirectoryBlob;
byte[] signedFileData = ByteReader.ReadBytes(file.GetBytes(), 0, (int)codeDirectory.CodeLimit);
List <byte[]> hashes = HashAlgorithmHelper.ComputeHashes(codeDirectory.HashType, codeDirectory.PageSize, signedFileData);
if (hashes.Count != codeDirectory.CodeHashes.Count)
{
return(false);
}
for (int index = 0; index < hashes.Count; index++)
{
if (!ByteUtils.AreByteArraysEqual(hashes[index], codeDirectory.CodeHashes[index]))
{
return(false);
}
}
return(true);
}
return(false);
}