keychain/ot/OTDeviceInformationAdapter.m

   1 #import "keychain/ot/OTDeviceInformationAdapter.h"
   2 #import "keychain/ot/OTConstants.h"
   3 #import "keychain/ckks/CKKSListenerCollection.h"
   4 #import "keychain/ckks/CKKS.h"
   5
   6 #include <SystemConfiguration/SystemConfiguration.h>
   7 #import <Security/SecInternalReleasePriv.h>
   8
   9 #if TARGET_OS_OSX
  10 #include <sys/sysctl.h>
  11 #include <IOKit/IOKitLib.h>
  12 #else
  13 #import <sys/utsname.h>
  14 #include <MobileGestalt.h>
  15 #endif
  16
  17 static void updateDeviceNameChanges(SCDynamicStoreRef store, CFArrayRef keys, void *context);
  18
  19 @interface OTDeviceInformationActualAdapter ()
  20 @property CKKSListenerCollection<id<OTDeviceInformationNameUpdateListener>>* deviceNameUpdateListeners;
  21 @property (assign) SCDynamicStoreRef store;
  22 @end
  23
  24 @implementation OTDeviceInformationActualAdapter
  25
  26 - (void)dealloc {
  27     if (self.store) {
  28         CFRelease(self.store);
  29         self.store = NULL;
  30     }
  31 }
  32
  33 - (NSString*)modelID
  34 {
  35     static NSString *hwModel = nil;
  36     static dispatch_once_t onceToken;
  37     dispatch_once(&onceToken, ^{
  38 #if TARGET_OS_SIMULATOR
  39         // Asking for a real value in the simulator gives the results for the underlying mac. Not particularly useful.
  40         hwModel = [NSString stringWithFormat:@"%s", getenv("SIMULATOR_MODEL_IDENTIFIER")];
  41 #elif TARGET_OS_OSX
  42         size_t size;
  43         sysctlbyname("hw.model", NULL, &size, NULL, 0);
  44         char *sysctlString = malloc(size);
  45         sysctlbyname("hw.model", sysctlString, &size, NULL, 0);
  46         hwModel = [[NSString alloc] initWithUTF8String:sysctlString];
  47         free(sysctlString);
  48
  49         // macOS running virtualized sometimes has new and unknown model IDs.
  50         // So, if we don't recognize the model ID, return something more useful.
  51         if(!([hwModel hasPrefix:@"iMac"] ||
  52              [hwModel hasPrefix:@"Mac"])) {
  53             hwModel = [NSString stringWithFormat:@"MacUnknown-%@", hwModel];
  54         }
  55 #else
  56         struct utsname systemInfo;
  57         uname(&systemInfo);
  58
  59         hwModel = [NSString stringWithCString:systemInfo.machine
  60                                      encoding:NSUTF8StringEncoding];
  61 #endif
  62     });
  63     return hwModel;
  64 }
  65
  66 - (NSString* _Nullable)deviceName
  67 {
  68     if (SecIsInternalRelease()) {
  69         NSString *deviceName = CFBridgingRelease(SCDynamicStoreCopyComputerName(NULL, NULL));
  70         return deviceName;
  71     } else {
  72         return nil;
  73     }
  74 }
  75
  76 - (void)registerForDeviceNameUpdates:(id<OTDeviceInformationNameUpdateListener>)listener
  77 {
  78     // Octagon only uses the device name on internal releases.
  79     // Therefore, if this is not an internal release, don't bother registering clients--they don't need the update.
  80     if (SecIsInternalRelease()) {
  81         @synchronized (self) {
  82             [self setupDeviceNameListener];
  83             [self.deviceNameUpdateListeners registerListener:listener];
  84         }
  85     }
  86 }
  87
  88 - (NSString*)osVersion
  89 {
  90     return SecCKKSHostOSVersion();
  91 }
  92
  93 #if TARGET_OS_IPHONE
  94
  95 #include <MobileGestalt.h>
  96
  97 - (NSString*)serialNumber
  98 {
  99     int mgError = kMGNoError;
 100     NSString *serialNumber = CFBridgingRelease(MGCopyAnswerWithError(kMGQSerialNumber, NULL, &mgError));
 101     if (![serialNumber isKindOfClass:[NSString class]]) {
 102         serialNumber = nil;
 103         secnotice("octagon", "failed getting serial number: %d", mgError);
 104     }
 105     return serialNumber;
 106 }
 107
 108 #else
 109
 110 - (NSString*)serialNumber
 111 {
 112     io_service_t platformExpert = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"));
 113     if (platformExpert == MACH_PORT_NULL) {
 114         secnotice("octagon", "failed getting serial number (platform IOPlatformExpertDevice)");
 115         return nil;
 116     }
 117     NSString *serialNumber = CFBridgingRelease(IORegistryEntryCreateCFProperty(platformExpert, CFSTR(kIOPlatformSerialNumberKey), kCFAllocatorDefault, 0));
 118     if (![serialNumber isKindOfClass:[NSString class]]) {
 119         serialNumber = nil;
 120         secnotice("octagon", "failed getting serial number (IORegistryEntry)");
 121     }
 122     IOObjectRelease(platformExpert);
 123     return serialNumber;
 124 }
 125
 126 #endif
 127
 128
 129 - (void)setupDeviceNameListener {
 130     if (self.deviceNameUpdateListeners == nil) {
 131         self.deviceNameUpdateListeners = [[CKKSListenerCollection alloc] initWithName:@"OTDeviceInformationActualAdapter"];
 132
 133         CFStringRef computerKey = SCDynamicStoreKeyCreateComputerName(NULL);
 134         if (computerKey == NULL) {
 135             return;
 136         }
 137         NSArray *keys = @[ (__bridge NSString *)computerKey];
 138         CFRelease(computerKey);
 139
 140         SCDynamicStoreContext context = { .info = (void *)(__bridge CFTypeRef)self };
 141         self.store = SCDynamicStoreCreate(NULL, CFSTR("OTDeviceInformationActualAdapter"), updateDeviceNameChanges, &context);
 142         if (self.store == NULL) {
 143             return;
 144         }
 145
 146         SCDynamicStoreSetNotificationKeys(self.store, (__bridge CFArrayRef)keys, NULL);
 147         SCDynamicStoreSetDispatchQueue(self.store, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0));
 148     }
 149 }
 150
 151 @end
 152
 153 static void updateDeviceNameChanges(SCDynamicStoreRef store, CFArrayRef keys, void *info)
 154 {
 155     secnotice("octagon", "Notified that the device name has changed");
 156     OTDeviceInformationActualAdapter *adapter = (__bridge id)info;
 157
 158     [adapter.deviceNameUpdateListeners iterateListeners:^void(id<OTDeviceInformationNameUpdateListener> object){
 159         [object deviceNameUpdated];
 160     }];
 161 }
 162