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); }