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fix: add code signing requirements to xpc connections #206
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ethanndickson
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| import Foundation | ||
|
|
||
| public enum ValidationError: Error { | ||
| case fileNotFound | ||
| case unableToCreateStaticCode | ||
| case invalidSignature | ||
| case unableToRetrieveInfo | ||
| case invalidIdentifier(identifier: String?) | ||
| case invalidTeamIdentifier(identifier: String?) | ||
| case missingInfoPList | ||
| case invalidVersion(version: String?) | ||
| case belowMinimumCoderVersion | ||
|
|
||
| public var description: String { | ||
| switch self { | ||
| case .fileNotFound: | ||
| "The file does not exist." | ||
| case .unableToCreateStaticCode: | ||
| "Unable to create a static code object." | ||
| case .invalidSignature: | ||
| "The file's signature is invalid." | ||
| case .unableToRetrieveInfo: | ||
| "Unable to retrieve signing information." | ||
| case let .invalidIdentifier(identifier): | ||
| "Invalid identifier: \(identifier ?? "unknown")." | ||
| case let .invalidVersion(version): | ||
| "Invalid runtime version: \(version ?? "unknown")." | ||
| case let .invalidTeamIdentifier(identifier): | ||
| "Invalid team identifier: \(identifier ?? "unknown")." | ||
| case .missingInfoPList: | ||
| "Info.plist is not embedded within the dylib." | ||
| case .belowMinimumCoderVersion: | ||
| """ | ||
| The Coder deployment must be version \(Validator.minimumCoderVersion) | ||
| or higher to use Coder Desktop. | ||
| """ | ||
| } | ||
| } | ||
|
|
||
| public var localizedDescription: String { description } | ||
| } | ||
|
|
||
| public class Validator { | ||
| // Whilst older dylibs exist, this app assumes v2.20 or later. | ||
| public static let minimumCoderVersion = "2.20.0" | ||
|
|
||
| private static let expectedName = "CoderVPN" | ||
| private static let expectedIdentifier = "com.coder.Coder-Desktop.VPN.dylib" | ||
| private static let expectedTeamIdentifier = "4399GN35BJ" | ||
|
|
||
| private static let infoIdentifierKey = "CFBundleIdentifier" | ||
| private static let infoNameKey = "CFBundleName" | ||
| private static let infoShortVersionKey = "CFBundleShortVersionString" | ||
|
|
||
| private static let signInfoFlags: SecCSFlags = .init(rawValue: kSecCSSigningInformation) | ||
|
|
||
| // `expectedVersion` must be of the form `[0-9]+.[0-9]+.[0-9]+` | ||
| public static func validate(path: URL, expectedVersion: String) throws(ValidationError) { | ||
| guard FileManager.default.fileExists(atPath: path.path) else { | ||
| throw .fileNotFound | ||
| } | ||
|
|
||
| var staticCode: SecStaticCode? | ||
| let status = SecStaticCodeCreateWithPath(path as CFURL, SecCSFlags(), &staticCode) | ||
| guard status == errSecSuccess, let code = staticCode else { | ||
| throw .unableToCreateStaticCode | ||
| } | ||
|
|
||
| let validateStatus = SecStaticCodeCheckValidity(code, SecCSFlags(), nil) | ||
| guard validateStatus == errSecSuccess else { | ||
| throw .invalidSignature | ||
| } | ||
|
|
||
| var information: CFDictionary? | ||
| let infoStatus = SecCodeCopySigningInformation(code, signInfoFlags, &information) | ||
| guard infoStatus == errSecSuccess, let info = information as? [String: Any] else { | ||
| throw .unableToRetrieveInfo | ||
| } | ||
|
|
||
| guard let identifier = info[kSecCodeInfoIdentifier as String] as? String, | ||
| identifier == expectedIdentifier | ||
| else { | ||
| throw .invalidIdentifier(identifier: info[kSecCodeInfoIdentifier as String] as? String) | ||
| } | ||
|
|
||
| guard let teamIdentifier = info[kSecCodeInfoTeamIdentifier as String] as? String, | ||
| teamIdentifier == expectedTeamIdentifier | ||
| else { | ||
| throw .invalidTeamIdentifier( | ||
| identifier: info[kSecCodeInfoTeamIdentifier as String] as? String | ||
| ) | ||
| } | ||
|
|
||
| guard let infoPlist = info[kSecCodeInfoPList as String] as? [String: AnyObject] else { | ||
| throw .missingInfoPList | ||
| } | ||
|
|
||
| try validateInfo(infoPlist: infoPlist, expectedVersion: expectedVersion) | ||
| } | ||
|
|
||
| public static let xpcPeerRequirement = "anchor apple generic" + // Apple-issued certificate chain | ||
| " and certificate leaf[subject.OU] = \"" + expectedTeamIdentifier + "\"" // Signed by the Coder team | ||
|
|
||
| private static func validateInfo(infoPlist: [String: AnyObject], expectedVersion: String) throws(ValidationError) { | ||
| guard let plistIdent = infoPlist[infoIdentifierKey] as? String, plistIdent == expectedIdentifier else { | ||
| throw .invalidIdentifier(identifier: infoPlist[infoIdentifierKey] as? String) | ||
| } | ||
|
|
||
| guard let plistName = infoPlist[infoNameKey] as? String, plistName == expectedName else { | ||
| throw .invalidIdentifier(identifier: infoPlist[infoNameKey] as? String) | ||
| } | ||
|
|
||
| // Downloaded dylib must match the version of the server | ||
| guard let dylibVersion = infoPlist[infoShortVersionKey] as? String, | ||
| expectedVersion == dylibVersion | ||
| else { | ||
| throw .invalidVersion(version: infoPlist[infoShortVersionKey] as? String) | ||
| } | ||
|
|
||
| // Downloaded dylib must be at least the minimum Coder server version | ||
| guard let dylibVersion = infoPlist[infoShortVersionKey] as? String, | ||
| // x.compare(y) is .orderedDescending if x > y | ||
| minimumCoderVersion.compare(dylibVersion, options: .numeric) != .orderedDescending | ||
| else { | ||
| throw .belowMinimumCoderVersion | ||
| } | ||
| } | ||
| } | ||
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Probably should go onto it's own class since it seems unrelated to the binary signature validation.