Can i use iokit usb lib to disable build-in camera?

I developed a driverkit extension based on overriding-the-default-usb-video-class-extension, but the link didn’t give the details of realization. I asked DTS who gave two tips: 1, Do you also have a CMIO extension to load in place of the default overriding-the-default-usb-video-class-extension 2, Your DriverKit extension’s info.plist is also missing the CameraAssistantBundleID. I want to know why a driverkit extension needs a CMIO extension, what’s the data and control flow?

When I use IOKit/usb/IOUSBLib to toggle build-in camera, I got an ERROR:ret IOReturn -536870210 How can I resolve it? Can I use IOUSBLib to disable or hide build-in camera? My environment: Model Name: MacBook Pro ProductVersion: 15.5 Model Identifier: MacBookPro15,2 Processor Name: Quad-Core Intel Core i5 Processor Speed: 2.4 GHz Number of Processors: 1 // 禁用/启用USB设备 bool toggleUSBDevice(uint16_t vendorID, uint16_t productID, bool enable) { std::cout << (enable ? "Enabling" : "Disabling") << " USB device with VID: 0x" << std::hex << vendorID << ", PID: 0x" << productID << std::endl; // 创建匹配字典查找指定VID/PID的USB设备 CFMutableDictionaryRef matchingDict = IOServiceMatching(kIOUSBDeviceClassName); if (!matchingDict) { std::cerr << "Failed to create USB device matching dictionary." << std::endl; return false; } // 设置VID/PID匹配条件 CFNumberRef vendorIDRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt16Type, &vendorID); CFNumberRef productIDRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt16Type, &productID); CFDictionarySetValue(matchingDict, CFSTR(kUSBVendorID), vendorIDRef); CFDictionarySetValue(matchingDict, CFSTR(kUSBProductID), productIDRef); CFRelease(vendorIDRef); CFRelease(productIDRef); // 获取匹配的设备迭代器 io_iterator_t deviceIterator; if (IOServiceGetMatchingServices(kIOMainPortDefault, matchingDict, &deviceIterator) != KERN_SUCCESS) { std::cerr << "Failed to get USB device iterator." << std::endl; CFRelease(matchingDict); return false; } io_service_t usbDevice; bool result = false; int deviceCount = 0; // 遍历所有匹配的设备 while ((usbDevice = IOIteratorNext(deviceIterator)) != IO_OBJECT_NULL) { deviceCount++; // 获取设备路径 char path[1024]; if (IORegistryEntryGetPath(usbDevice, kIOServicePlane, path) == KERN_SUCCESS) { std::cout << "Found device at path: " << path << std::endl; } // 打开设备 IOCFPlugInInterface** plugInInterface = NULL; IOUSBDeviceInterface** deviceInterface = NULL; SInt32 score; IOReturn ret = IOCreatePlugInInterfaceForService( usbDevice, kIOUSBDeviceUserClientTypeID, kIOCFPlugInInterfaceID, &plugInInterface, &score); if (ret == kIOReturnSuccess && plugInInterface) { ret = (*plugInInterface)->QueryInterface(plugInInterface, CFUUIDGetUUIDBytes(kIOUSBDeviceInterfaceID), (LPVOID*)&deviceInterface); (*plugInInterface)->Release(plugInInterface); } if (ret != kIOReturnSuccess) { std::cerr << "Failed to open USB device interface. Error:" << ret << std::endl; IOObjectRelease(usbDevice); continue; } // 禁用/启用设备 if (enable) { // 启用设备 - 重新配置设备 ret = (*deviceInterface)->USBDeviceReEnumerate(deviceInterface, 0); if (ret == kIOReturnSuccess) { std::cout << "Device enabled successfully." << std::endl; result = true; } else { std::cerr << "Failed to enable device. Error: " << ret << std::endl; } } else { // 禁用设备 - 断开设备连接 ret = (*deviceInterface)->USBDeviceClose(deviceInterface); if (ret == kIOReturnSuccess) { std::cout << "Device disabled successfully." << std::endl; result = true; } else { std::cerr << "Failed to disable device. Error: " << ret << std::endl; } } // 关闭设备接口 (*deviceInterface)->Release(deviceInterface); IOObjectRelease(usbDevice); } IOObjectRelease(deviceIterator); if (deviceCount == 0) { std::cerr << "No device found with specified VID/PID." << std::endl; return false; } return result; }

Hello, As part of developing a DLP system, I need to block input devices upon detection of data leakage. Could you advise if it's possible to temporarily disable the built-in keyboard and camera? Thank you in advance, Pavel

Hello, I'm trying to get a list of all network devices (device audit for DLP system). CFMutableDictionaryRef matchingDictionary = IOServiceMatching(kIONetworkControllerClass); if (matchingDictionary == nullptr) { std::cerr << "IOServiceMatching() returned empty matching dictionary" << std::endl; return 1; } io_iterator_t iter; if (kern_return_t kr = IOServiceGetMatchingServices(kIOMasterPortDefault, matchingDictionary, &iter); kr != KERN_SUCCESS) { std::cerr << "IOServiceGetMatchingServices() failed" << std::endl; return 1; } io_service_t networkController; while ((networkController = IOIteratorNext(iter)) != IO_OBJECT_NULL) { std::cout << "network device: "; if (CFDataRef cfIOMACAddress = (CFDataRef) IORegistryEntryCreateCFProperty(networkController, CFSTR(kIOMACAddress), kCFAllocatorDefault, kNilOptions); cfIOMACAddress != nullptr) { std::vector<uint8_t> data(CFDataGetLength(cfIOMACAddress)); CFDataGetBytes(cfIOMACAddress, CFRangeMake(0, data.size()), data.data()); std::cout << std::hex << std::setfill('0') << std::setw(2) << (short)data[0] << ":" << std::hex << std::setfill('0') << std::setw(2) << (short) data[1] << ":" << std::hex << std::setfill('0') << std::setw(2) << (short) data[2] << ":" << std::hex << std::setfill('0') << std::setw(2) << (short) data[3] << ":" << std::hex << std::setfill('0') << std::setw(2) << (short) data[4] << ":" << std::hex << std::setfill('0') << std::setw(2) << (short) data[5]; CFRelease(cfIOMACAddress); } std::cout << std::endl; IOObjectRelease(networkController); } IOObjectRelease(iter); The Wi-Fi controller shows up in I/O Registry Explorer, but IOServiceGetMatchingServices() does not return any information about it. Any way to retrieve Wi-Fi controller info in daemon code? Thank you in advance!

Hello, I am working on app which must prevent attaching any USB devices to Mac due to security. Unfortunately I have not found any direct way to implement such blocking: Looks like IOKit does not allow to block USB (at least in user space) ES_EVENT_TYPE_AUTH_IOKIT_OPEN (Endpoint Security) does not prevent using USB device if I send response ES_AUTH_RESULT_DENY for "AppleUSBHostDeviceUserClient" I have found several similar problems on forum but no any solution: https://developer.apple.com/forums/thread/671193 (https://developer.apple.com/forums/thread/756573 https://developer.apple.com/forums/thread/741051 What is the easiest way to implement such blocking? Thank you in advance!

Hello, I need to enumerate built-in media devices (cameras, microphones, etc.). For this purpose, I am using the CoreAudio and CoreMediaIO frameworks. According to the table 'Daemon-Safe Frameworks' in Apple’s TN2083, CoreAudio is daemon-safe. However, the documentation does not mention CoreMediaIO. Can CoreMediaIO be used in a daemon? If not, are there any documented alternatives to detect built-in cameras in a daemon (e.g., via device classes in IOKit)? Thank you in advance, Pavel

Hi all, In MacOS, how can I disable or enable build-in camera by program or script?

Investigating a kernel panic, I discovered that Apple Silicon Panic traces are not working with how I know to symbolicate the panic information. I have not found proper documentation that corrects this situation. Attached file is an indentity-removed panic, received from causing an intentional panic (dereferencing nullptr), so that I know what functions to expect in the call stack. This is cut-and-pasted from the "Report To Apple" dialog that appears after the reboot: panic_1_4_21_b.txt To start, I download and install the matching KDK (in this case KDK_14.6.1_23G93.kdk), identified from this line: OS version: 23G93 Kernel version: Darwin Kernel Version 23.6.0: Mon Jul 29 21:14:04 PDT 2024; root:xnu-10063.141.2~1/RELEASE_ARM64_T8122 Then start lldb from Terminal, using this command: bash_prompt % lldb -arch arm64e /Library/Developer/KDKs/KDK_14.6.1_23G93.kdk/System/Library/Kernels/kernel.release.t8122 Next I load the remaining scripts per the instructions from lldb: (lldb) settings set target.load-script-from-symbol-file true I need to know what address to load my kext symbols to, which I read from this line of the panic log, after the @ symbol: com.company.product(1.4.21d119)[92BABD94-80A4-3F6D-857A-3240E4DA8009]@0xfffffe001203bfd0->0xfffffe00120533ab I am using a debug build of my kext, so the DWARF symbols are part of the binary. I use this line to load the symbols into the lldb session: (lldb) addkext -F /Library/Extensions/KextName.kext/Contents/MacOS/KextName 0xfffffe001203bfd0 And now I should be able to use lldb image lookup to identify pointers on the stack that land within my kext. For example, the current PC at the moment of the crash lands within the kext (expected, because it was intentional): (lldb) image lookup -a 0xfffffe001203fe10 Which gives the following incorrect result: Address: KextName[0x0000000000003e40] (KextName.__TEXT.__cstring + 14456) Summary: "ffer has %d retains\n" That's not even a program instruction - that's within a cstring. No, that cstring isn't involved in anything pertaining to the intentional panic I am expecting to see. Can someone please explain what I'm doing wrong and provide instructions that will give symbol information from a panic trace on an Apple Silicon Mac? Disclaimers: Yes I know IOPCIFamily is deprecated, I am in process of transitioning to DriverKit Dext from IOKit kext. Until then I must maintain the kext. Terminal command "atos" provides similar incorrect results, and seems to not work with debug-built-binaries (only dSYM files) Yes this is an intentional panic so that I can verify the symbolicate process before I move on to investigating an unexpected panic I have set nvram boot-args to include keepsyms=1 I have tried (lldb) command script import lldb.macosx but get a result of error: no images in crash log (after the nvram settings)

Hello, What is the best and Apple recommended way to get display name and its vendor information? The CoreGraphics framework provides ModelNumber and VendorNumber only. Looks like IOKit does not provide any documented way at all. Are there any daemon safe way to get such information? Thank you in advance, Pavel

I need to implement a solution through an API or custom driver to completely block out the built-in speakers and microphone of Mac, because I need other apps to use specified external devices as audio input and output. Is there a way to achieve this requirement? What I mean is that even in system preferences, it should not be possible to choose the built-in microphone and speakers; only my external device can be used.

I'd like to write an app to help diagnose malfunctioning home theater setups. I've seen libcec, but it doesn't seem to support Apple's HDMI ports (and maybe APIs to support it don't exist? I'm not sure.) Thanks in advance. Sorry if I've applied the wrong tags to this post.

We have a macOS application which interacts with our USB and PCI devices to perform SCSI and NVME commands on them. We use IOUSBHost, IOUSBLib and IOKitLib for USB interface and have created a custom driver to interact with PCI devices. Is there a way we can implement a similar functionality for iOS as well if we connect the cards and readers using OTG?

When plugging in my matched USB device I see the logs below. It seems the kernelmanagerd process is sandboxed and can't write out the reason my Dext failed to load. Is there somewhere else I can look for this info? default 11:03:22.175152-0700 kernelmanagerd Received kext load notification: me.keithg.MyUserUSBInterfaceDriver default 11:03:22.177637-0700 kernel 1 duplicate report for Sandbox: icdd(2124) allow file-read-data /Library/Image Capture/Devices error 11:03:22.177681-0700 kernel Sandbox: kernelmanagerd(545) deny(1) file-write-create /private/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/com.apple.kernelmanagerd/TemporaryItems com.apple.libcoreservices error 11:03:22.177711-0700 kernelmanagerd mkdir: path=/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/com.apple.kernelmanagerd/TemporaryItems/ mode= -rwx------: [1: Operation not permitted] error 11:03:22.179361-0700 kernel Sandbox: kernelmanagerd(545) deny(1) file-write-create /private/var/db/loadedkextmt.plist.sb-5a00fc77-LNttZF com.apple.libcoreservices error 11:03:22.177755-0700 kernelmanagerd _dirhelper_relative_internal: error for path <private>: [1: Operation not permitted] com.apple.accessories default 11:03:22.177674-0700 WindowServer Sending analytics event... (eventName: com.apple.ioport.transport.USB.published) error 11:03:22.179913-0700 kernelmanagerd Failed to write extension load report plist.

Hello @all I'm develop a DriverKit driver extension and without entitlement checks by OS everything runs fine. But if the entitlements check is enabled in the NVRAM then I get an error due connecting my IOUserClient instance. Which entitlements are really and exactly required for my driver? My driver contains: one IOUserClient instance and multiple IOUserSerial instances The bundle identifier of the driver ist: org.eof.tools.VSPDriver The bundle identifier of the client app org.eof.tools.VSPInstall My entire source code is available on GitHub if any one want to dive deep in :) kernel[0:5107] () [VSPDriver]: NewUserClient called. kernel[0:5107] () [VSPDriver]: CreateUserClient: create VSP user client from Info.plist. kernel[0:5107] () [VSPUserClient]: init called. kernel[0:5107] () [VSPUserClient]: init finished. kernel[0:5107] () [VSPDriver]: CreateUserClient: check VSPUserClient type. kernel[0:5107] () [VSPDriver]: CreateUserClient: success. kernel[0:5107] () [VSPDriver]: NewUserClient finished. kernel[0:5107] () [VSPUserClient]: Start: called. kernel[0:5107] () [VSPUserClient]: User client successfully started. kernel[0:389f] DK: VSPUserClient-0x100001127:UC failed userclient-access check, needed bundle ID org.eof.tools.VSPDriver kernel[0:389f] DK: VSPUserClient-0x100001127:UC entitlements check failed kernel[0:5107] () [VSPUserClient]: Stop called. kernel[0:5107] () [VSPUserClient]: User client successfully removed. kernel[0:5107] () [VSPUserClient]: free called. Here my drivers entitlement file: <?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.developer.driverkit</key> <true/> <key>com.apple.developer.driverkit.allow-third-party-userclients</key> <true/> <key>com.apple.developer.driverkit.family.serial</key> <true/> </dict> </plist> Here my drivers Info.plist file <?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>CFBundleDevelopmentRegion</key> <string>$(DEVELOPMENT_LANGUAGE)</string> <key>CFBundleExecutable</key> <string>$(EXECUTABLE_NAME)</string> <key>CFBundleIdentifier</key> <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string> <key>CFBundleInfoDictionaryVersion</key> <string>6.0</string> <key>CFBundleName</key> <string>$(PRODUCT_NAME)</string> <key>CFBundlePackageType</key> <string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string> <key>CFBundleShortVersionString</key> <string>1.0</string> <key>CFBundleVersion</key> <string>1</string> <key>NSHumanReadableCopyright</key> <string>Copyright © 2025 by EoF Software Labs</string> <key>OSBundleUsageDescription</key> <string>Provide virtual serial port</string> <key>com.apple.developer.driverkit</key> <true/> <key>com.apple.developer.driverkit.allow-any-userclient-access</key> <true/> <key>com.apple.developer.driverkit.communicates-with-drivers</key> <true/> <key>com.apple.developer.system-extension.redistributable</key> <true/> <key>OSBundleLibraries</key> <dict> <key>com.apple.iokit.IOSerialFamily</key> <string>1.0</string> </dict> <key>IOKitPersonalities</key> <dict> <key>VSPDriver</key> <dict> <key>CFBundleIdentifier</key> <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string> <key>CFBundleIdentifierKernel</key> <string>com.apple.kpi.iokit</string> <key>IOMatchCategory</key> <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string> <key>IOProviderClass</key> <string>IOUserResources</string> <key>IOResourceMatch</key> <string>IOKit</string> <key>IOProbeScore</key> <integer>0</integer> <key>IOClass</key> <string>IOUserService</string> <key>IOUserClass</key> <string>VSPDriver</string> <key>IOUserServerName</key> <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string> <key>UserClientProperties</key> <dict> <key>IOClass</key> <string>IOUserUserClient</string> <key>IOUserClass</key> <string>VSPUserClient</string> </dict> <key>SerialPortProperties</key> <dict> <key>CFBundleIdentifierKernel</key> <string>com.apple.driver.driverkit.serial</string> <key>IOProviderClass</key> <string>IOSerialStreamSync</string> <key>IOClass</key> <string>IOUserSerial</string> <key>IOUserClass</key> <string>VSPSerialPort</string> <key>HiddenPort</key> <false/> <key>IOTTYBaseName</key> <string>vsp</string> <key>IOTTYSuffix</key> <string>0</string> </dict> </dict> </dict> </dict> </plist> Here the entitlements of the client app <?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.developer.driverkit</key> <true/> <key>com.apple.developer.driverkit.allow-third-party-userclients</key> <true/> <key>com.apple.developer.driverkit.communicates-with-drivers</key> <true/> <key>com.apple.developer.shared-with-you</key> <true/> <key>com.apple.developer.system-extension.install</key> <true/> <key>com.apple.security.application-groups</key> <array> <string>$(TeamIdentifierPrefix).org.eof.apps</string> </array> </dict> </plist> Here the Info.plist of the client app: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>CFBundleDevelopmentRegion</key> <string>$(DEVELOPMENT_LANGUAGE)</string> <key>CFBundleExecutable</key> <string>$(EXECUTABLE_NAME)</string> <key>CFBundleIdentifier</key> <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string> <key>CFBundleInfoDictionaryVersion</key> <string>6.0</string> <key>CFBundleName</key> <string>$(PRODUCT_NAME)</string> <key>CFBundlePackageType</key> <string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string> <key>CFBundleShortVersionString</key> <string>1.0</string> <key>CFBundleVersion</key> <string>1</string> <key>LSMinimumSystemVersion</key> <string>$(MACOSX_DEPLOYMENT_TARGET)</string> <key>com.apple.developer.driverkit</key> <true/> <key>com.apple.developer.driverkit.install</key> <true/> <key>com.apple.developer.system-extension.install</key> <true/> <key>com.apple.developer.system-extension.uninstall</key> <true/> <key>com.apple.developer.driverkit.userclient-access</key> <array> <string>VSPDriver</string> </array> <key>com.apple.private.driverkit.driver-access</key> <array> <string>VSPDriver</string> </array> <key>com.apple.security.temporary-exception.iokit-user-client-class</key> <array> <string>IOUserUserClient</string> </array> </dict> </plist>

I'm working on a project to allow HID input from macOS to a connected iOS device. Are we prohibited from matching to a connected iPhone with DriverKit? I see the attribute kCDCDoNotMatchThisDevice for my iPhone is YES when looking at the IO registry and my dext does not initialize