我已经阅读了很多理论上可以验证应用内和/或捆绑收据的文档和代码。
鉴于我对 SSL、证书、加密等方面的知识几乎为零，所以我读过的所有解释，比如这个有希望的解释，我都很难理解。
他们说解释是不完整的，因为每个人都必须弄清楚如何去做，否则黑客将很容易创建一个可以识别和识别模式并修补应用程序的破解应用程序。好的，我在一定程度上同意这一点。我认为他们可以完全解释如何做到这一点，并发出警告说“修改这个方法”、“修改这个其他方法”、“混淆这个变量”、“更改这个和那个的名称”等。
那里的一些好心人可以解释如何在我五岁时从上到下清楚地解释如何在 iOS 7 上本地验证、捆绑收据和应用内购买收据（好吧，让它 3）？
谢谢！！！
如果您的应用程序有一个版本，并且您担心黑客会看到您是如何做到的，只需在此处发布之前更改您的敏感方法。混淆字符串，更改行的顺序，更改循环的方式（从使用 for 到阻止枚举，反之亦然）等等。显然，每个使用可能在此处发布的代码的人都必须做同样的事情，而不是冒被轻易入侵的风险。
这是我如何在我的应用内购买库RMStore中解决这个问题的演练。我将解释如何验证交易，包括验证整个收据。
获取收据并验证交易。如果失败，请刷新收据并重试。这使得验证过程是异步的，因为刷新收据是异步的。
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];
}];
收据在[[NSBundle mainBundle] appStoreReceiptURL]里面，实际上是一个 PCKS7 容器。我不擅长密码学，所以我使用 OpenSSL 打开这个容器。其他人显然是纯粹用系统框架来完成的。
将 OpenSSL 添加到您的项目中并非易事。RMStore wiki应该会有所帮助。
如果您选择使用 OpenSSL 打开 PKCS7 容器，您的代码可能如下所示。从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;
}
稍后我们将进入验证的详细信息。
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（我们稍后会谈到）以及每个适用的应用内购买的具体信息。
在读取 ASN1 时，OpenSSL 再次提供了帮助。从RMAppReceipt，使用一些辅助方法：
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;
每个应用内购买也在 ASN1 中。解析它与解析一般收据信息非常相似。
从RMAppReceipt，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;
}
}
}];
需要注意的是，某些应用内购买，例如消耗品和不可更新订阅，只会在收据中出现一次。您应该在购买后立即验证这些（同样，RMStore 可以帮助您）。
现在我们从收据及其所有应用内购买中获得了所有字段。首先我们验证收据本身，然后我们简单地检查收据是否包含交易的产品。
下面是我们一开始回调的方法。从RMStoreAppReceiptVerificator：
- (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;
}
验证收据本身归结为：
来自RMStoreAppReceiptVerificator的高级代码中的 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;
}
让我们深入到第 2 步和第 5 步。
当我们提取数据时，我们浏览了收据签名验证。收据使用 Apple Inc. 根证书签名，该证书可从Apple 根证书颁发机构下载。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;
}
在解析收据之前，这是在开始时完成的。
收据中包含的哈希是设备 ID 的 SHA1、收据中包含的一些不透明值和捆绑包 ID。
这就是您在 iOS 上验证收据哈希的方式。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];
}
这就是它的要点。我可能在这里或那里遗漏了一些东西，所以我稍后可能会回到这篇文章。无论如何，我建议浏览完整的代码以获取更多详细信息。
我很惊讶这里没有人提到Receigen。它是一种自动生成混淆收据验证码的工具，每次都不一样；它同时支持 GUI 和命令行操作。强烈推荐。
（不隶属于 Receigen，只是一个快乐的用户。）
当我键入时，我使用这样的 Rakefile 自动重新运行 Receigen（因为它需要在每次版本更改时完成）rake receigen：
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
注意：不建议在客户端做这种类型的验证
这是用于验证应用内购买收据的Swift 4版本...
让我们创建一个枚举来表示收据验证的可能错误
enum ReceiptValidationError: Error {
case receiptNotFound
case jsonResponseIsNotValid(description: String)
case notBought
case expired
}
然后让我们创建验证收据的函数，如果无法验证它会抛出错误。
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 响应可以包含不同产品的多个收据信息，因此它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
}
现在您可以调用此函数并处理可能的错误情况
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).")
}
您可以从 App Store Connect获取密码。
https://developer.apple.com打开这个链接点击
Account tabDo Sign inOpen iTune ConnectOpen My AppOpen Feature TabOpen In App PurchaseClick at the right side on 'View Shared Secret'At the bottom you will get a secrete key复制该密钥并粘贴到密码字段中。