Script to convert decrypted iOS apps to iOS Simulator (arm64 Macs only)

iOS2Simulator.py

# Script to recursively find mach-o binaries in a directory
# and convert the buildtools using vtool to IOSSIMULATOR

import os
import subprocess

# Path to the vtool
vtool_path = "/usr/bin/vtool"
codesign_path = "/usr/bin/codesign"
xattr_path = "/usr/bin/xattr"

# Path to the directory containing the binaries
bin_path = input("Drag and drop the .app file here: ").strip('"').strip()
machO_files = []
frameworks = []

# Recursively find all the mach-o binaries in the directory
for root, dirs, files in os.walk(bin_path):
    for file in files:
        # print("Checking " + file)
        # Check the magic number of the file
        # Mach-o binaries start with 0xfeedface on 32-bit and 0xfeedfacf on 64-bit
        # LITTLE ENDIAN
        with open(os.path.join(root, file), "rb") as f:
            magic = f.read(4)
            if magic == b"\xce\xfa\xed\xfe" or magic == b"\xcf\xfa\xed\xfe":
                machO_files.append(os.path.join(root, file))

    for dir in dirs:
        if dir.endswith(".framework"):
            frameworks.append(os.path.join(root, dir))

print("Found " + str(len(machO_files)) + " mach-o binaries")

# Convert the binaries using vtool -set-build-version
for file in machO_files:
    print("Converting " + file)
    subprocess.call(
        [
            vtool_path,
            "-set-build-version",
            "iossim",
            "14.0",
            "14.0",
            "-replace",
            "-output",
            file,
            file,
        ]
    )
    print("Done")

# dummy entitlement with app sandbox enabled
DUMMY_ENTITLEMENT = """
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>com.apple.security.app-sandbox</key>
<true/>
</dict>
</plist>
"""

# Create a dummy entitlements file
with open("entitlements.plist", "w") as f:
    f.write(DUMMY_ENTITLEMENT)

# Re-sign the entire app with a local certificate
print("Re-signing the app")
subprocess.call(
    [
        codesign_path,
        "-f",
        "-s-",
        "--deep",
        "--entitlements",
        "entitlements.plist",
        bin_path,
    ]
)

# Re-sign the frameworks
for framework in frameworks:
    print("Re-signing " + framework)
    subprocess.call(
        [
            codesign_path,
            "-f",
            "-s-",
            "--entitlements",
            "entitlements.plist",
            "--deep",
            framework,
        ]
    )

# Remove the dummy entitlements file
os.remove("entitlements.plist")

# Remove all the extended attributes
print("Removing extended attributes")
subprocess.call([xattr_path, "-rc", bin_path])

print("Done")