我已经阅读了很多文档和代码，理论上可以验证应用内购买和/或捆绑收据。
考虑到我对SSL、证书、加密等知识几乎一无所知，我读过的所有解释，像这个有希望的解释，都让我难以理解。
他们说这些解释不完整，因为每个人都必须找出如何做，否则黑客将轻松地创建一个破解应用程序，可以识别和标识模式并修补应用程序。好吧，我同意在某种程度上这点。我认为他们可以完全解释如何做，并放置警告说“修改这种方法”，“修改那种方法”，“混淆这个变量”，“更改这个和那个的名称”等等。
是否有一些善良的灵魂能够友好地解释如何在iOS 7上本地验证、捆绑收据和应用内购买收据，就像我才三岁一样，从头到尾，清晰明了？
谢谢！！！
如果你有一个在应用中运行的版本，并且你担心黑客会看到你是如何做的，只需在发布之前更改敏感方法。混淆字符串、更改行的顺序、改变循环方式（从使用for到块枚举或反之）等等。显然，每个使用可能在这里发布的代码的人都必须做同样的事情，以避免被轻易破解。
RMAppReceipt *receipt = [RMAppReceipt bundleReceipt];
const BOOL verified = [self verifyTransaction:transaction inReceipt:receipt success:successBlock failure:nil]; // failureBlock is nil intentionally. See below.
if (verified) return;
// Apple recommends to refresh the receipt if validation fails on iOS
[[RMStore defaultStore] refreshReceiptOnSuccess:^{
RMAppReceipt *receipt = [RMAppReceipt bundleReceipt];
[self verifyTransaction:transaction inReceipt:receipt success:successBlock failure:failureBlock];
} failure:^(NSError *error) {
[self failWithBlock:failureBlock error:error];
}];
收据位于[[NSBundle mainBundle] appStoreReceiptURL]，实际上是一个PCKS7容器。我不擅长密码学，所以我使用了OpenSSL来打开这个容器。其他人似乎纯粹使用system frameworks就做到了这一点。
将OpenSSL添加到您的项目中并不容易。RMStore wiki应该会有帮助。
如果您选择使用OpenSSL来打开PKCS7容器，则您的代码可能如下所示。来自RMAppReceipt:
+ (NSData*)dataFromPKCS7Path:(NSString*)path
{
const char *cpath = [[path stringByStandardizingPath] fileSystemRepresentation];
FILE *fp = fopen(cpath, "rb");
if (!fp) return nil;
PKCS7 *p7 = d2i_PKCS7_fp(fp, NULL);
fclose(fp);
if (!p7) return nil;
NSData *data;
NSURL *certificateURL = [[NSBundle mainBundle] URLForResource:@"AppleIncRootCertificate" withExtension:@"cer"];
NSData *certificateData = [NSData dataWithContentsOfURL:certificateURL];
if ([self verifyPKCS7:p7 withCertificateData:certificateData])
{
struct pkcs7_st *contents = p7->d.sign->contents;
if (PKCS7_type_is_data(contents))
{
ASN1_OCTET_STRING *octets = contents->d.data;
data = [NSData dataWithBytes:octets->data length:octets->length];
}
}
PKCS7_free(p7);
return data;
}
收据以ASN1格式表示。它包含一般信息，一些用于验证目的的字段（稍后我们会讲到），以及每个适用的应用内购买的特定信息。
同样地，当涉及到读取ASN1时，OpenSSL可以提供帮助。使用RMAppReceipt中的一些辅助方法：
NSMutableArray *purchases = [NSMutableArray array];
[RMAppReceipt enumerateASN1Attributes:asn1Data.bytes length:asn1Data.length usingBlock:^(NSData *data, int type) {
const uint8_t *s = data.bytes;
const NSUInteger length = data.length;
switch (type)
{
case RMAppReceiptASN1TypeBundleIdentifier:
_bundleIdentifierData = data;
_bundleIdentifier = RMASN1ReadUTF8String(&s, length);
break;
case RMAppReceiptASN1TypeAppVersion:
_appVersion = RMASN1ReadUTF8String(&s, length);
break;
case RMAppReceiptASN1TypeOpaqueValue:
_opaqueValue = data;
break;
case RMAppReceiptASN1TypeHash:
_hash = data;
break;
case RMAppReceiptASN1TypeInAppPurchaseReceipt:
{
RMAppReceiptIAP *purchase = [[RMAppReceiptIAP alloc] initWithASN1Data:data];
[purchases addObject:purchase];
break;
}
case RMAppReceiptASN1TypeOriginalAppVersion:
_originalAppVersion = RMASN1ReadUTF8String(&s, length);
break;
case RMAppReceiptASN1TypeExpirationDate:
{
NSString *string = RMASN1ReadIA5SString(&s, length);
_expirationDate = [RMAppReceipt formatRFC3339String:string];
break;
}
}
}];
_inAppPurchases = purchases;
每个应用内购买也都是ASN1格式的。解析它与解析一般收据信息非常相似。
从RMAppReceipt中使用相同的辅助方法：
[RMAppReceipt enumerateASN1Attributes:asn1Data.bytes length:asn1Data.length usingBlock:^(NSData *data, int type) {
const uint8_t *p = data.bytes;
const NSUInteger length = data.length;
switch (type)
{
case RMAppReceiptASN1TypeQuantity:
_quantity = RMASN1ReadInteger(&p, length);
break;
case RMAppReceiptASN1TypeProductIdentifier:
_productIdentifier = RMASN1ReadUTF8String(&p, length);
break;
case RMAppReceiptASN1TypeTransactionIdentifier:
_transactionIdentifier = RMASN1ReadUTF8String(&p, length);
break;
case RMAppReceiptASN1TypePurchaseDate:
{
NSString *string = RMASN1ReadIA5SString(&p, length);
_purchaseDate = [RMAppReceipt formatRFC3339String:string];
break;
}
case RMAppReceiptASN1TypeOriginalTransactionIdentifier:
_originalTransactionIdentifier = RMASN1ReadUTF8String(&p, length);
break;
case RMAppReceiptASN1TypeOriginalPurchaseDate:
{
NSString *string = RMASN1ReadIA5SString(&p, length);
_originalPurchaseDate = [RMAppReceipt formatRFC3339String:string];
break;
}
case RMAppReceiptASN1TypeSubscriptionExpirationDate:
{
NSString *string = RMASN1ReadIA5SString(&p, length);
_subscriptionExpirationDate = [RMAppReceipt formatRFC3339String:string];
break;
}
case RMAppReceiptASN1TypeWebOrderLineItemID:
_webOrderLineItemID = RMASN1ReadInteger(&p, length);
break;
case RMAppReceiptASN1TypeCancellationDate:
{
NSString *string = RMASN1ReadIA5SString(&p, length);
_cancellationDate = [RMAppReceipt formatRFC3339String:string];
break;
}
}
}];
- (BOOL)verifyTransaction:(SKPaymentTransaction*)transaction
inReceipt:(RMAppReceipt*)receipt
success:(void (^)())successBlock
failure:(void (^)(NSError *error))failureBlock
{
const BOOL receiptVerified = [self verifyAppReceipt:receipt];
if (!receiptVerified)
{
[self failWithBlock:failureBlock message:NSLocalizedString(@"The app receipt failed verification", @"")];
return NO;
}
SKPayment *payment = transaction.payment;
const BOOL transactionVerified = [receipt containsInAppPurchaseOfProductIdentifier:payment.productIdentifier];
if (!transactionVerified)
{
[self failWithBlock:failureBlock message:NSLocalizedString(@"The app receipt doest not contain the given product", @"")];
return NO;
}
if (successBlock)
{
successBlock();
}
return YES;
}
验证收据本身包括以下内容：
从RMStoreAppReceiptVerificator的代码高层次上看，有5个步骤：
- (BOOL)verifyAppReceipt:(RMAppReceipt*)receipt
{
// Steps 1 & 2 were done while parsing the receipt
if (!receipt) return NO;
// Step 3
if (![receipt.bundleIdentifier isEqualToString:self.bundleIdentifier]) return NO;
// Step 4
if (![receipt.appVersion isEqualToString:self.bundleVersion]) return NO;
// Step 5
if (![receipt verifyReceiptHash]) return NO;
return YES;
}
让我们深入了解步骤2和5。
在提取数据时，我们忽略了收据签名验证。该收据使用苹果公司根证书进行签名，可从Apple Root Certificate Authority下载。以下代码将PKCS7容器和根证书作为数据，并检查它们是否匹配：
+ (BOOL)verifyPKCS7:(PKCS7*)container withCertificateData:(NSData*)certificateData
{ // Based on: https://developer.apple.com/library/content/releasenotes/General/ValidateAppStoreReceipt/Chapters/ValidateLocally.html#//apple_ref/doc/uid/TP40010573-CH1-SW17
static int verified = 1;
int result = 0;
OpenSSL_add_all_digests(); // Required for PKCS7_verify to work
X509_STORE *store = X509_STORE_new();
if (store)
{
const uint8_t *certificateBytes = (uint8_t *)(certificateData.bytes);
X509 *certificate = d2i_X509(NULL, &certificateBytes, (long)certificateData.length);
if (certificate)
{
X509_STORE_add_cert(store, certificate);
BIO *payload = BIO_new(BIO_s_mem());
result = PKCS7_verify(container, NULL, store, NULL, payload, 0);
BIO_free(payload);
X509_free(certificate);
}
}
X509_STORE_free(store);
EVP_cleanup(); // Balances OpenSSL_add_all_digests (), per http://www.openssl.org/docs/crypto/OpenSSL_add_all_algorithms.html
return result == verified;
}
收据中包含的哈希是设备ID、收据中包含的一些不透明值和捆绑标识符的SHA1。
以下是在iOS上验证收据哈希的方法。从RMAppReceipt：
- (BOOL)verifyReceiptHash
{
// TODO: Getting the uuid in Mac is different. See: https://developer.apple.com/library/content/releasenotes/General/ValidateAppStoreReceipt/Chapters/ValidateLocally.html#//apple_ref/doc/uid/TP40010573-CH1-SW5
NSUUID *uuid = [[UIDevice currentDevice] identifierForVendor];
unsigned char uuidBytes[16];
[uuid getUUIDBytes:uuidBytes];
// Order taken from: https://developer.apple.com/library/content/releasenotes/General/ValidateAppStoreReceipt/Chapters/ValidateLocally.html#//apple_ref/doc/uid/TP40010573-CH1-SW5
NSMutableData *data = [NSMutableData data];
[data appendBytes:uuidBytes length:sizeof(uuidBytes)];
[data appendData:self.opaqueValue];
[data appendData:self.bundleIdentifierData];
NSMutableData *expectedHash = [NSMutableData dataWithLength:SHA_DIGEST_LENGTH];
SHA1(data.bytes, data.length, expectedHash.mutableBytes);
return [expectedHash isEqualToData:self.hash];
}
这就是要点。可能会有一些细节我没有涉及到，所以我之后可能会回来修改这篇文章。无论如何，我建议浏览完整的代码以获取更多细节。
我很惊讶没有人在这里提到Receigen。它是一个工具，可以自动生成混淆的收据验证代码，每次生成的代码都不同；它支持GUI和命令行操作。强烈推荐。
（与Receigen无关，只是一位快乐的用户。）
我使用像这样的Rakefile自动重新运行Receigen（因为它需要在每个版本更改时完成），当我输入rake receigen时：
desc "Regenerate App Store Receipt validation code using Receigen app (which must be already installed)"
task :receigen do
# TODO: modify these to match your app
bundle_id = 'com.example.YourBundleIdentifierHere'
output_file = File.join(__dir__, 'SomeDir/ReceiptValidation.h')
version = PList.get(File.join(__dir__, 'YourProjectFolder/Info.plist'), 'CFBundleVersion')
command = %Q</Applications/Receigen.app/Contents/MacOS/Receigen --identifier #{bundle_id} --version #{version} --os ios --prefix ReceiptValidation --success callblock --failure callblock>
puts "#{command} > #{output_file}"
data = `#{command}`
File.open(output_file, 'w') { |f| f.write(data) }
end
module PList
def self.get file_name, key
if File.read(file_name) =~ %r!<key>#{Regexp.escape(key)}</key>\s*<string>(.*?)</string>!
$1.strip
else
nil
end
end
end
enum ReceiptValidationError: Error {
case receiptNotFound
case jsonResponseIsNotValid(description: String)
case notBought
case expired
}
接下来我们创建一个验证收据的函数，如果无法验证，则会抛出错误。
func validateReceipt() throws {
guard let appStoreReceiptURL = Bundle.main.appStoreReceiptURL, FileManager.default.fileExists(atPath: appStoreReceiptURL.path) else {
throw ReceiptValidationError.receiptNotFound
}
let receiptData = try! Data(contentsOf: appStoreReceiptURL, options: .alwaysMapped)
let receiptString = receiptData.base64EncodedString()
let jsonObjectBody = ["receipt-data" : receiptString, "password" : <#String#>]
#if DEBUG
let url = URL(string: "https://sandbox.itunes.apple.com/verifyReceipt")!
#else
let url = URL(string: "https://buy.itunes.apple.com/verifyReceipt")!
#endif
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = try! JSONSerialization.data(withJSONObject: jsonObjectBody, options: .prettyPrinted)
let semaphore = DispatchSemaphore(value: 0)
var validationError : ReceiptValidationError?
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, let httpResponse = response as? HTTPURLResponse, error == nil, httpResponse.statusCode == 200 else {
validationError = ReceiptValidationError.jsonResponseIsNotValid(description: error?.localizedDescription ?? "")
semaphore.signal()
return
}
guard let jsonResponse = (try? JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers)) as? [AnyHashable: Any] else {
validationError = ReceiptValidationError.jsonResponseIsNotValid(description: "Unable to parse json")
semaphore.signal()
return
}
guard let expirationDate = self.expirationDate(jsonResponse: jsonResponse, forProductId: <#String#>) else {
validationError = ReceiptValidationError.notBought
semaphore.signal()
return
}
let currentDate = Date()
if currentDate > expirationDate {
validationError = ReceiptValidationError.expired
}
semaphore.signal()
}
task.resume()
semaphore.wait()
if let validationError = validationError {
throw validationError
}
}
让我们使用这个辅助函数来获取特定产品的到期日期。该函数接收JSON响应和产品ID。JSON响应可能包含多个不同产品的收据信息，因此它会获取指定参数的最后一个信息。
func expirationDate(jsonResponse: [AnyHashable: Any], forProductId productId :String) -> Date? {
guard let receiptInfo = (jsonResponse["latest_receipt_info"] as? [[AnyHashable: Any]]) else {
return nil
}
let filteredReceipts = receiptInfo.filter{ return ($0["product_id"] as? String) == productId }
guard let lastReceipt = filteredReceipts.last else {
return nil
}
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd HH:mm:ss VV"
if let expiresString = lastReceipt["expires_date"] as? String {
return formatter.date(from: expiresString)
}
return nil
}
do {
try validateReceipt()
// The receipt is valid
print("Receipt is valid")
} catch ReceiptValidationError.receiptNotFound {
// There is no receipt on the device
} catch ReceiptValidationError.jsonResponseIsNotValid(let description) {
// unable to parse the json
print(description)
} catch ReceiptValidationError.notBought {
// the subscription hasn't being purchased
} catch ReceiptValidationError.expired {
// the subscription is expired
} catch {
print("Unexpected error: \(error).")
}
https://developer.apple.com，点击以下步骤：
账户标签登录打开iTune Connect打开我的应用程序打开功能标签打开应用内购买在右侧点击“查看共享密钥”底部将显示一个秘密密钥