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185 changes: 185 additions & 0 deletions
185
WultraMobileTokenSDK/Common/ProvisioningUtils/WMTMachOReader.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| // | ||
| // Copyright 2024 Wultra s.r.o. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions | ||
| // and limitations under the License. | ||
| // | ||
|
|
||
| import Foundation | ||
| import MachO | ||
| import CommonCrypto | ||
|
|
||
| class WMTMachOReader { | ||
|
|
||
| private struct CSSuperBlob { | ||
| var magic: UInt32 | ||
| var length: UInt32 | ||
| var count: UInt32 | ||
| } | ||
|
|
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| private struct CSBlob { | ||
| var type: UInt32 | ||
| var offset: UInt32 | ||
| } | ||
|
|
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| private struct CSMagic { | ||
| static let embeddedSignature: UInt32 = 0xfade0cc0 | ||
| static let embeddedEntitlements: UInt32 = 0xfade7171 | ||
| } | ||
|
|
||
| private enum BinaryType { | ||
| struct HeaderData { | ||
| let headerSize: Int | ||
| let commandCount: Int | ||
| } | ||
| struct FatHeaderData { | ||
| let archCount: Int | ||
| } | ||
| case singleArch(headerInfo: HeaderData) | ||
| case fat(header: FatHeaderData) | ||
| } | ||
|
|
||
| private var entitlements = [WMTProvision.Entitlements]() | ||
|
|
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| static func readEntitlements(_ binaryPath: String) -> [WMTProvision.Entitlements]? { | ||
| WMTMachOReader(binaryPath)?.entitlements | ||
| } | ||
|
|
||
| private init?(_ binaryPath: String) { | ||
| guard let binary = BinaryReader(binaryPath) else { | ||
| return nil | ||
| } | ||
|
|
||
| switch getBinaryType(binary: binary) { | ||
| case .singleArch(let headerInfo): | ||
| let headerSize = headerInfo.headerSize | ||
| let commandCount = headerInfo.commandCount | ||
| if let data = readEntitlementsFromBinarySlice(binary: binary, headerOffset: headerSize, dataOffset: 0, cmdCount: commandCount) { | ||
| entitlements.append(data) | ||
| } | ||
| case .fat(let header): | ||
| entitlements.append(contentsOf: readEntitlementsFromFatBinary(binary: binary, architectureCount: header.archCount, startingAt: MemoryLayout<fat_header>.size)) | ||
| default: | ||
| return nil | ||
| } | ||
| } | ||
|
|
||
| private func getBinaryType(binary: BinaryReader, fromSliceStartingAt offset: UInt64 = 0) -> BinaryType? { | ||
| binary.seek(to: offset) | ||
| let header: mach_header = binary.read() | ||
| let commandCount = Int(header.ncmds) | ||
| switch header.magic { | ||
| case MH_MAGIC: | ||
| let data = BinaryType.HeaderData(headerSize: MemoryLayout<mach_header>.size, commandCount: commandCount) | ||
| return .singleArch(headerInfo: data) | ||
| case MH_MAGIC_64: | ||
| let data = BinaryType.HeaderData(headerSize: MemoryLayout<mach_header_64>.size, commandCount: commandCount) | ||
| return .singleArch(headerInfo: data) | ||
| default: | ||
| binary.seek(to: 0) | ||
| let fatHeader: fat_header = binary.read() | ||
| if CFSwapInt32(fatHeader.magic) == FAT_MAGIC { | ||
| let archCount = Int(CFSwapInt32(fatHeader.nfat_arch)) | ||
| return .fat(header: BinaryType.FatHeaderData(archCount: archCount)) | ||
| } else { | ||
| return nil | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private func readEntitlementsFromFatBinary(binary: BinaryReader, architectureCount: Int, startingAt: Int) -> [WMTProvision.Entitlements] { | ||
| var entitlements = [WMTProvision.Entitlements]() | ||
| for i in 0..<architectureCount { | ||
| let offset = startingAt + (i * MemoryLayout<fat_arch>.size) | ||
| binary.seek(to: UInt64(offset)) | ||
| let fatArch: fat_arch = binary.read() | ||
| let fatArchOffset = CFSwapInt32(fatArch.offset) | ||
| let arch = getBinaryType(binary: binary, fromSliceStartingAt: UInt64(fatArchOffset)) | ||
| switch arch { | ||
| case .singleArch(let headerInfo): | ||
| let headerOffset = Int(fatArchOffset) + headerInfo.headerSize | ||
| if let parsed = readEntitlementsFromBinarySlice(binary: binary, headerOffset: headerOffset, dataOffset: fatArchOffset, cmdCount: headerInfo.commandCount) { | ||
| entitlements.append(parsed) | ||
| } | ||
| default: | ||
| break | ||
| } | ||
| } | ||
| return entitlements | ||
| } | ||
|
|
||
| private func readEntitlementsFromBinarySlice(binary: BinaryReader, headerOffset: Int, dataOffset: UInt32, cmdCount: Int) -> WMTProvision.Entitlements? { | ||
| binary.seek(to: UInt64(headerOffset)) | ||
| for _ in 0..<cmdCount { | ||
| let command: load_command = binary.read() | ||
| if command.cmd == LC_CODE_SIGNATURE { | ||
| let signatureOffset: UInt32 = binary.read() | ||
| return readEntitlementsData(binary: binary, startingAt: signatureOffset + dataOffset) | ||
| } | ||
| binary.seek(to: binary.currentOffset + UInt64(command.cmdsize - UInt32(MemoryLayout<load_command>.size))) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| private func readEntitlementsData(binary: BinaryReader, startingAt offset: UInt32) -> WMTProvision.Entitlements? { | ||
| binary.seek(to: UInt64(offset)) | ||
| let metaBlob: CSSuperBlob = binary.read() | ||
| if CFSwapInt32(metaBlob.magic) == CSMagic.embeddedSignature { | ||
| let metaBlobSize = UInt32(MemoryLayout<CSSuperBlob>.size) | ||
| let blobSize = UInt32(MemoryLayout<CSBlob>.size) | ||
| let itemCount = CFSwapInt32(metaBlob.count) | ||
| for index in 0..<itemCount { | ||
| let readOffset = UInt64(offset + metaBlobSize + index * blobSize) | ||
| binary.seek(to: readOffset) | ||
| let blob: CSBlob = binary.read() | ||
| binary.seek(to: UInt64(offset + CFSwapInt32(blob.offset))) | ||
| let blobMagic = CFSwapInt32(binary.read()) | ||
| if blobMagic == CSMagic.embeddedEntitlements { | ||
| let signatureLength = CFSwapInt32(binary.read()) | ||
| let signatureData = binary.readData(ofLength: Int(signatureLength) - 8) | ||
| return try? PropertyListDecoder().decode(WMTProvision.Entitlements.self, from: signatureData) | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
| } | ||
|
|
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| private class BinaryReader { | ||
|
|
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| private let handle: FileHandle | ||
|
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| init?(_ path: String) { | ||
| guard let binaryHandle = FileHandle(forReadingAtPath: path) else { | ||
| return nil | ||
| } | ||
| handle = binaryHandle | ||
| } | ||
|
|
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| var currentOffset: UInt64 { handle.offsetInFile } | ||
|
|
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| func seek(to offset: UInt64) { | ||
| handle.seek(toFileOffset: offset) | ||
| } | ||
|
|
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| func read<T>() -> T { | ||
| handle.readData(ofLength: MemoryLayout<T>.size).withUnsafeBytes({ $0.load(as: T.self) }) | ||
| } | ||
|
|
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| func readData(ofLength length: Int) -> Data { | ||
| handle.readData(ofLength: length) | ||
| } | ||
|
|
||
| deinit { | ||
| handle.closeFile() | ||
| } | ||
| } |
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