SOSAuthKitHelpers.m   [plain text]

//
// SOSAuthKitHelpers.m
// Security
//
//

#import <Foundation/Foundation.h>
#import "SOSAuthKitHelpers.h"
#import <utilities/debugging.h>
#import "keychain/SecureObjectSync/SOSAccount.h"
#import "keychain/SecureObjectSync/SOSAccountPriv.h"
#import "keychain/SecureObjectSync/SOSFullPeerInfo.h"
#import "keychain/SecureObjectSync/SOSPeerInfoV2.h"
#import "keychain/SecureObjectSync/SOSPeerInfoPriv.h"

#if !TARGET_OS_BRIDGE && !TARGET_OS_SIMULATOR && __OBJC2__
#import <AppleAccount/AppleAccount_Private.h>
#import <AuthKit/AuthKit.h>
#import <AuthKit/AuthKit_Private.h>
#import <SoftLinking/SoftLinking.h>

#define SUPPORT_MID 1

SOFT_LINK_FRAMEWORK(PrivateFrameworks, AuthKit);
SOFT_LINK_FRAMEWORK(Frameworks, Accounts);

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wstrict-prototypes"
SOFT_LINK_CLASS(AuthKit, AKAccountManager);
SOFT_LINK_CLASS(AuthKit, AKAnisetteProvisioningController);
SOFT_LINK_CLASS(AuthKit, AKAppleIDAuthenticationController);
SOFT_LINK_CLASS(AuthKit, AKDeviceListRequestContext);
SOFT_LINK_CLASS(Accounts, Accounts);
SOFT_LINK_CLASS(Accounts, ACAccountStore);
SOFT_LINK_CONSTANT(AuthKit, AKServiceNameiCloud, const NSString *);
#pragma clang diagnostic pop

static void *accountsFramework = NULL;
static void *appleAccountFramework = NULL;

static void
initAccountsFramework(void) {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
accountsFramework = dlopen("/System/Library/Frameworks/Accounts.framework/Accounts", RTLD_LAZY);
appleAccountFramework = dlopen("/System/Library/PrivateFrameworks/AppleAccount.framework/AppleAccount", RTLD_LAZY);
});
}

@implementation SOSAuthKitHelpers

@class SOSAuthKitHelpers;

+ (NSString *) machineID {
NSError *error = nil;
NSString *retval = nil;
secnotice("sosauthkit", "Entering machineID");

AKAnisetteProvisioningController *anisetteController = [getAKAnisetteProvisioningControllerClass() new];
if(anisetteController) {
AKAnisetteData *anisetteData = [anisetteController anisetteDataWithError:&error];
if (anisetteData) {
retval = [anisetteData.machineID copy];
if(retval) {
secnotice("sosauthkit", "machineID is %@", retval);
} else {
secnotice("sosauthkit", "Failed to get machineID");
}
} else {
secnotice("sosauthkit", "can't get mID: %@", error);
}
} else {
secnotice("sosauthkit", "can't get controller");
}
return retval;
}

static ACAccount *GetPrimaryAccount(void) {
ACAccount *primaryAccount;

initAccountsFramework();

ACAccountStore *store = [getACAccountStoreClass() new];

if(!store) {
secnotice("sosauthkit", "can't get store");
return nil;
}

primaryAccount = [store aa_primaryAppleAccount];

return primaryAccount;
}

+ (void)activeMIDs:(void(^_Nonnull)(NSSet <SOSTrustedDeviceAttributes *> *activeMIDs, NSError *error))complete {
ACAccount *primaryAccount;
AKDeviceListRequestContext *context;

primaryAccount = GetPrimaryAccount();

if(!primaryAccount) {
secnotice("sosauthkit", "can't get account");
complete(NULL, [NSError errorWithDomain:(__bridge NSString *)kSecErrorDomain code:errSecParam userInfo:@{NSLocalizedDescriptionKey : @"no primary account"}]);
return;
}

context = [getAKDeviceListRequestContextClass() new];
if (context == NULL) {
complete(NULL, [NSError errorWithDomain:(__bridge NSString *)kSecErrorDomain code:errSecParam userInfo:@{NSLocalizedDescriptionKey : @"can't get AKDeviceListRequestContextClass"}]);
return;
}
context.altDSID = primaryAccount.aa_altDSID;
context.services = @[ getAKServiceNameiCloud() ];

// -[AKAppleIDAuthenticationController fetchDeviceListWithContext:error:] is not exposed, use a semaphore
AKAppleIDAuthenticationController *authController = [getAKAppleIDAuthenticationControllerClass() new];
if(!authController) {
complete(NULL, [NSError errorWithDomain:(__bridge NSString *)kSecErrorDomain code:errSecParam userInfo:@{NSLocalizedDescriptionKey : @"can't get authController"}]);
return;
}

[authController fetchDeviceListWithContext:context completion:^(NSArray<AKRemoteDevice *> *deviceList, NSError *error) {
NSMutableSet *mids = [NSMutableSet new];
for(AKRemoteDevice *akdev in deviceList) {
SOSTrustedDeviceAttributes *newdev = [SOSTrustedDeviceAttributes new];
newdev.machineID = akdev.machineId;
newdev.serialNumber = akdev.serialNumber;
[mids addObject:newdev];
}
if([mids count] == 0) {
secnotice("sosauthkit", "found no devices in account");
mids = nil;
}
complete(mids, error);
}];
}

+ (bool) peerinfoHasMID: (SOSAccount *) account {
SOSPeerInfoRef pi = SOSFullPeerInfoGetPeerInfo(account.fullPeerInfo);
if(!pi) return true; // if there's no PI then just say "we don't need one"
return SOSPeerInfoV2DictionaryHasString(pi, sMachineIDKey);
}

+ (bool) updateMIDInPeerInfo: (SOSAccount *) account {
NSString *mid = [SOSAuthKitHelpers machineID];
if(!mid) return true;
CFErrorRef error = NULL;
SOSAccountSetValue(account, sMachineIDKey, (__bridge CFStringRef)mid, &error);
bool peerUpdated = SOSAccountUpdatePeerInfoAndPush(account, CFSTR("Add Machine ID"), &error, ^bool(SOSPeerInfoRef pi, CFErrorRef *error) {
if(SOSPeerInfoV2DictionaryHasString(pi, sMachineIDKey)) {
return false;
}
secnotice("sosauthkit", "Setting PeerInfo MID to %@", mid);
SOSPeerInfoV2DictionarySetValue(pi, sMachineIDKey, (__bridge CFStringRef)mid);
return true;
});
if(!peerUpdated) {
secnotice("sosauthkit", "Failed to record MID in PeerInfo: %@", error);
}
CFReleaseNull(error);
return peerUpdated;
}

+ (bool) accountIsHSA2 {
bool hsa2 = false;

ACAccount *primaryAccount = GetPrimaryAccount();
AKAccountManager *manager = [getAKAccountManagerClass() new];

if(manager && primaryAccount) {
ACAccount *account = [manager authKitAccountWithAltDSID:[manager altDSIDForAccount:primaryAccount]];
AKAppleIDSecurityLevel securityLevel = [manager securityLevelForAccount:account];
if(securityLevel == AKAppleIDSecurityLevelHSA2) {
hsa2 = true;
} else {
secnotice("sosauthkit", "Security level is %lu", (unsigned long)securityLevel);
}
secnotice("sosauthkit", "Account %s HSA2", (hsa2) ? "is": "isn't" );
} else {
secnotice("sosauthkit", "Failed to get manager");
}
return hsa2;
}

-(id) initWithActiveMIDS: (NSSet <SOSTrustedDeviceAttributes *> *) theMidList
{
self = [super init];
if(!self){
return nil;
}
NSMutableSet *MmachineIDs = [[NSMutableSet alloc] init];
NSMutableSet *MserialNumbers = [[NSMutableSet alloc] init];
_machineIDs = [[NSSet alloc] init];
_serialNumbers = [[NSSet alloc] init];

if(!theMidList) return nil;
_midList = theMidList;

for(SOSTrustedDeviceAttributes *dev in _midList) {
if(dev.machineID) {
[MmachineIDs addObject:dev.machineID];
}
if(dev.serialNumber) {
[MserialNumbers addObject:dev.serialNumber];
}

}
_machineIDs = MmachineIDs;
_serialNumbers = MserialNumbers;
return self;
}

// if the ID passed in is null, the peer doesn't have one, we'll say true - we can't tell from the list
- (bool) midIsValidInList: (NSString *) machineId {
return (machineId) ? [_machineIDs containsObject:machineId]: true;
}

- (bool) serialIsValidInList: (NSString *) serialNumber {
return (serialNumber) ? [_serialNumbers containsObject:serialNumber]: true;
}

- (bool) isUseful {
return [ _machineIDs count ] > 0;
}

#else

@implementation SOSAuthKitHelpers

@class SOSAuthKitHelpers;

+ (NSString *) machineID {
return nil;
}

+ (void)activeMIDs:(void(^_Nonnull)(NSSet<SOSTrustedDeviceAttributes*> *activeMIDs, NSError *error))complete {
complete(nil, nil);
}

+ (bool) updateMIDInPeerInfo: (SOSAccount *) account {
return true;
}

+ (bool) peerinfoHasMID: (SOSAccount *) account {
return true;
}

+ (bool) accountIsHSA2 {
return false;
}

- (id _Nullable) initWithActiveMIDS: (NSSet *_Nullable) theMidList {
return nil;
}

- (bool) midIsValidInList: (NSString *_Nullable) machineId {
return true;
}

- (bool) serialIsValidInList: (NSString *_Nullable) serialNumber {
return true;
}

- (bool) isUseful {
return false;
}

#endif

@end