public static CodeDirectoryBlob CreateCodeDirectoryBlob(int codeLength, string ident, string teamID) { HashType hashType = HashType.SHA1; int pageSize = 4096; CodeDirectoryBlob codeDirectory = new CodeDirectoryBlob(); codeDirectory.CodeLimit = (uint)codeLength; codeDirectory.HashType = hashType; codeDirectory.HashSize = (byte)HashAlgorithmHelper.GetHashLength(hashType); codeDirectory.PageSize = pageSize; codeDirectory.Ident = ident; codeDirectory.TeamID = teamID; // We put empty hashes as placeholder to ensure that the blob length will not change later. for (int index = 0; index < SpecialHashCount; index++) { codeDirectory.SpecialHashes.Add(new byte[codeDirectory.HashSize]); } int codeHashEntries = (int)Math.Ceiling((double)codeLength / pageSize); for (int index = 0; index < codeHashEntries; index++) { codeDirectory.CodeHashes.Add(new byte[codeDirectory.HashSize]); } return(codeDirectory); }
public static void ResignExecutable(MachObjectFile file, string bundleIdentifier, List <X509Certificate> certificateChain, AsymmetricKeyEntry privateKey, byte[] infoFileBytes, byte[] codeResourcesBytes, EntitlementsFile entitlements) { X509Certificate signingCertificate = certificateChain[certificateChain.Count - 1]; string certificateCN = CertificateHelper.GetCertificateCommonName(signingCertificate); string teamID = CertificateHelper.GetCertificateOrganizationalUnit(signingCertificate); SegmentCommand linkEditSegment = SegmentCommandHelper.FindLinkEditSegment(file.LoadCommands); if (linkEditSegment == null) { throw new InvalidDataException("LinkEdit segment was not found"); } if (file.LoadCommands[file.LoadCommands.Count - 1].CommandType != LoadCommandType.CodeSignature) { throw new NotImplementedException("The last LoadCommand entry is not CodeSignature"); } CodeSignatureCommand command = (CodeSignatureCommand)file.LoadCommands[file.LoadCommands.Count - 1]; int codeLength = (int)command.DataOffset; CodeDirectoryBlob codeDirectory = CreateCodeDirectoryBlob(codeLength, bundleIdentifier, teamID, HashType.SHA1); AttributeTable signedAttributesTable = null; #if ALT_CODE_DIRECTORY_SHA256 CodeDirectoryBlob alternativeCodeDirectory1 = CreateCodeDirectoryBlob(codeLength, bundleIdentifier, teamID, HashType.SHA256); signedAttributesTable = GenerateSignedAttributesTable(codeDirectory.GetBytes(), alternativeCodeDirectory1.GetBytes()); #endif CodeRequirementsBlob codeRequirements = CreateCodeRequirementsBlob(bundleIdentifier, certificateCN); EntitlementsBlob entitlementsBlob = CreateEntitlementsBlob(entitlements); CmsSignatureBlob cmsSignature = new CmsSignatureBlob(); // We create a dummy signature to determine the length required cmsSignature.Data = CMSHelper.GenerateSignature(certificateChain, privateKey, codeDirectory.GetBytes(), signedAttributesTable); CodeSignatureSuperBlob codeSignature = new CodeSignatureSuperBlob(); codeSignature.Entries.Add(CodeSignatureEntryType.CodeDirectory, codeDirectory); codeSignature.Entries.Add(CodeSignatureEntryType.Requirements, codeRequirements); codeSignature.Entries.Add(CodeSignatureEntryType.Entitlements, entitlementsBlob); #if ALT_CODE_DIRECTORY_SHA256 codeSignature.Entries.Add(CodeSignatureEntryType.AlternateCodeDirectory1, alternativeCodeDirectory1); #endif codeSignature.Entries.Add(CodeSignatureEntryType.CmsSignature, cmsSignature); command.DataSize = (uint)codeSignature.Length; uint finalFileSize = command.DataOffset + command.DataSize; SegmentCommandHelper.SetEndOffset(linkEditSegment, finalFileSize); byte[] codeToHash = ByteReader.ReadBytes(file.GetBytes(), 0, codeLength); UpdateSpecialHashes(codeDirectory, codeToHash, infoFileBytes, codeRequirements, codeResourcesBytes, entitlementsBlob); #if ALT_CODE_DIRECTORY_SHA256 UpdateSpecialHashes(alternativeCodeDirectory1, codeToHash, infoFileBytes, codeRequirements, codeResourcesBytes, entitlementsBlob); signedAttributesTable = GenerateSignedAttributesTable(codeDirectory.GetBytes(), alternativeCodeDirectory1.GetBytes()); #endif cmsSignature.Data = CMSHelper.GenerateSignature(certificateChain, privateKey, codeDirectory.GetBytes(), signedAttributesTable); // Store updated code signature: byte[] codeSignatureBytes = codeSignature.GetBytes(); Array.Resize <byte>(ref file.Data, (codeLength - file.DataOffset) + (int)command.DataSize); ByteWriter.WriteBytes(file.Data, (int)command.DataOffset - file.DataOffset, codeSignatureBytes); }
public static void UpdateHashes(CodeDirectoryBlob codeDirectory, byte[] codeToHash, byte[] infoFileBytes, CodeRequirementsBlob codeRequirements, byte[] codeResourcesBytes, EntitlementsBlob entitlements) { codeDirectory.CodeHashes = HashAlgorithmHelper.ComputeHashes(codeDirectory.HashType, codeDirectory.PageSize, codeToHash); codeDirectory.SpecialHashes = new List <byte[]>(); codeDirectory.SpecialHashes.Insert(0, (HashAlgorithmHelper.ComputeHash(codeDirectory.HashType, infoFileBytes))); codeDirectory.SpecialHashes.Insert(0, (HashAlgorithmHelper.ComputeHash(codeDirectory.HashType, codeRequirements.GetBytes()))); codeDirectory.SpecialHashes.Insert(0, (HashAlgorithmHelper.ComputeHash(codeDirectory.HashType, codeResourcesBytes))); if (SpecialHashCount >= CodeDirectoryBlob.ApplicationSpecificHashOffset) { codeDirectory.SpecialHashes.Insert(0, new byte[HashAlgorithmHelper.GetHashLength(codeDirectory.HashType)]); if (SpecialHashCount >= CodeDirectoryBlob.EntitlementsHashOffset) { codeDirectory.SpecialHashes.Insert(0, (HashAlgorithmHelper.ComputeHash(codeDirectory.HashType, entitlements.GetBytes()))); } } }
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); }