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Pods/GoogleUtilities/third_party/IsAppEncrypted/IsAppEncrypted.m

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+// Copyright (c) 2017 Landon J. Fuller <landon@landonf.org>
+// All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+// Comment from
+// <a href="http://iphonedevwiki.net/index.php/Crack_prevention">iPhone Dev
+// Wiki Crack Prevention</a>:
+// App Store binaries are signed by both their developer and Apple. This
+// encrypts the binary so that decryption keys are needed in order to make the
+// binary readable. When iOS executes the binary, the decryption keys are used
+// to decrypt the binary into a readable state where it is then loaded into
+// memory and executed. iOS can tell the encryption status of a binary via the
+// cryptid structure member of LC_ENCRYPTION_INFO MachO load command. If
+// cryptid is a non-zero value then the binary is encrypted.
+//
+// 'Cracking' works by letting the kernel decrypt the binary then siphoning the
+// decrypted data into a new binary file, resigning, and repackaging. This will
+// only work on jailbroken devices as codesignature validation has been
+// removed. Resigning takes place because while the codesignature doesn't have
+// to be valid thanks to the jailbreak, it does have to be in place unless you
+// have AppSync or similar to disable codesignature checks.
+//
+// More information at
+// <a href="http://landonf.org/2009/02/index.html">Landon Fuller's blog</a>
+
+#import "third_party/IsAppEncrypted/Public/IsAppEncrypted.h"
+
+#import <mach-o/dyld.h>
+#import <objc/objc.h>
+
+/// The encryption info struct and constants are missing from the iPhoneSimulator SDK, but not from
+/// the iPhoneOS or Mac OS X SDKs. Since one doesn't ever ship a Simulator binary, we'll just
+/// provide the definitions here.
+#if TARGET_OS_SIMULATOR && !defined(LC_ENCRYPTION_INFO)
+#define LC_ENCRYPTION_INFO 0x21
+struct encryption_info_command {
+  uint32_t cmd;
+  uint32_t cmdsize;
+  uint32_t cryptoff;
+  uint32_t cryptsize;
+  uint32_t cryptid;
+};
+#endif
+
+BOOL IsAppEncrypted(void) {
+  const struct mach_header *executableHeader = NULL;
+  for (uint32_t i = 0; i < _dyld_image_count(); i++) {
+    const struct mach_header *header = _dyld_get_image_header(i);
+    if (header && header->filetype == MH_EXECUTE) {
+      executableHeader = header;
+      break;
+    }
+  }
+
+  if (!executableHeader) {
+    return NO;
+  }
+
+  BOOL is64bit = (executableHeader->magic == MH_MAGIC_64);
+  uintptr_t cursor = (uintptr_t)executableHeader +
+                     (is64bit ? sizeof(struct mach_header_64) : sizeof(struct mach_header));
+  const struct segment_command *segmentCommand = NULL;
+  uint32_t i = 0;
+
+  while (i++ < executableHeader->ncmds) {
+    segmentCommand = (struct segment_command *)cursor;
+
+    if (!segmentCommand) {
+      continue;
+    }
+
+    if ((!is64bit && segmentCommand->cmd == LC_ENCRYPTION_INFO) ||
+        (is64bit && segmentCommand->cmd == LC_ENCRYPTION_INFO_64)) {
+      if (is64bit) {
+        struct encryption_info_command_64 *cryptCmd =
+            (struct encryption_info_command_64 *)segmentCommand;
+        return cryptCmd && cryptCmd->cryptid != 0;
+      } else {
+        struct encryption_info_command *cryptCmd = (struct encryption_info_command *)segmentCommand;
+        return cryptCmd && cryptCmd->cryptid != 0;
+      }
+    }
+    cursor += segmentCommand->cmdsize;
+  }
+
+  return NO;
+}