SOSAccountRecovery.c [plain text]
#include <AssertMacros.h>
#include "SOSAccountPriv.h"
#include "SOSCloudKeychainClient.h"
#include <Security/SecureObjectSync/SOSPeerInfoCollections.h>
#include <Security/SecureObjectSync/SOSViews.h>
#include "SOSInternal.h"
#include "SecADWrapper.h"
#include <Security/SecureObjectSync/SOSRecoveryKeyBag.h>
#include <Security/SecureObjectSync/SOSRingRecovery.h>
CFStringRef kRecoveryRingKey = CFSTR("recoveryKeyBag");
bool SOSAccountSetRecoveryKeyBagEntry(CFAllocatorRef allocator, SOSAccountRef account, SOSRecoveryKeyBagRef rkbg, CFErrorRef *error) {
CFDataRef rkbg_as_data = NULL;
bool result = false;
rkbg_as_data = SOSRecoveryKeyBagCopyEncoded(rkbg, error);
result = rkbg_as_data && SOSAccountSetValue(account, kRecoveryRingKey, rkbg_as_data, error);
CFReleaseNull(rkbg_as_data);
return result;
}
SOSRecoveryKeyBagRef SOSAccountCopyRecoveryKeyBagEntry(CFAllocatorRef allocator, SOSAccountRef account, CFErrorRef *error) {
SOSRecoveryKeyBagRef retval = NULL;
CFDataRef rkbg_as_data = asData(SOSAccountGetValue(account, kRecoveryRingKey, error), error);
require_quiet(rkbg_as_data, errOut);
retval = SOSRecoveryKeyBagCreateFromData(allocator, rkbg_as_data, error);
errOut:
return retval;
}
SOSRecoveryKeyBagRef SOSAccountCopyRecoveryKeyBag(CFAllocatorRef allocator, SOSAccountRef account, CFErrorRef *error) {
SOSRingRef recRing = NULL;
SOSRecoveryKeyBagRef rkbg = NULL;
require_action_quiet(account, errOut, SOSCreateError(kSOSErrorParam, CFSTR("No Account Object"), NULL, error));
recRing = SOSAccountCopyRingNamed(account, kSOSRecoveryRing, error);
require_quiet(recRing, errOut);
rkbg = SOSRingCopyRecoveryKeyBag(recRing, error);
errOut:
CFReleaseNull(recRing);
return rkbg;
}
CFDataRef SOSAccountCopyRecoveryPublic(CFAllocatorRef allocator, SOSAccountRef account, CFErrorRef *error) {
SOSRecoveryKeyBagRef rkbg = SOSAccountCopyRecoveryKeyBag(allocator, account, error);
CFDataRef recKey = NULL;
require_quiet(rkbg, errOut);
CFDataRef tmpKey = SOSRecoveryKeyBagGetKeyData(rkbg, error);
if(tmpKey) recKey = CFDataCreateCopy(kCFAllocatorDefault, tmpKey);
errOut:
CFReleaseNull(rkbg);
return recKey;
}
static bool SOSAccountUpdateRecoveryRing(SOSAccountRef account, CFErrorRef *error,
SOSRingRef (^modify)(SOSRingRef existing, CFErrorRef *error)) {
bool result = SOSAccountUpdateNamedRing(account, kSOSRecoveryRing, error, ^SOSRingRef(CFStringRef ringName, CFErrorRef *error) {
return SOSRingCreate(ringName, SOSAccountGetMyPeerID(account), kSOSRingRecovery, error);
}, modify);
return result;
}
static bool SOSAccountSetKeybagForRecoveryRing(SOSAccountRef account, SOSRecoveryKeyBagRef keyBag, CFErrorRef *error) {
bool result = SOSAccountUpdateRecoveryRing(account, error, ^SOSRingRef(SOSRingRef existing, CFErrorRef *error) {
SOSRingRef newRing = NULL;
CFSetRef peerSet = SOSAccountCopyPeerSetMatching(account, ^bool(SOSPeerInfoRef peer) {
return true;
});
CFMutableSetRef cleared = CFSetCreateMutableForCFTypes(NULL);
SOSRingSetPeerIDs(existing, cleared);
SOSRingAddAll(existing, peerSet);
require_quiet(SOSRingSetRecoveryKeyBag(existing, SOSAccountGetMyFullPeerInfo(account), keyBag, error), exit);
newRing = CFRetainSafe(existing);
exit:
CFReleaseNull(cleared);
return newRing;
});
SOSClearErrorIfTrue(result, error);
if (!result) {
secnotice("recovery", "Got error setting keybag for recovery : %@", error ? (CFTypeRef) *error : (CFTypeRef) CFSTR("No error space."));
}
return result;
}
bool SOSAccountRemoveRecoveryKey(SOSAccountRef account, CFErrorRef *error) {
bool result = SOSAccountSetKeybagForRecoveryRing(account, NULL, error);
SOSAccountSetRecoveryKeyBagEntry(kCFAllocatorDefault, account, NULL, NULL);
account->circle_rings_retirements_need_attention = true;
return result;
}
bool SOSAccountSetRecoveryKey(SOSAccountRef account, CFDataRef pubData, CFErrorRef *error) {
__block bool result = false;
CFDataRef oldRecoveryKey = NULL;
SOSRecoveryKeyBagRef rkbg = NULL;
require_quiet(SOSAccountIsInCircle(account, error), exit);
oldRecoveryKey = SOSAccountCopyRecoveryPublic(kCFAllocatorDefault, account, NULL); require_action_quiet(!CFEqualSafe(pubData, oldRecoveryKey), exit, result = true);
CFDataPerformWithHexString(pubData, ^(CFStringRef recoveryKeyString) {
CFDataPerformWithHexString(oldRecoveryKey, ^(CFStringRef oldRecoveryKeyString) {
secnotice("recovery", "SetRecoveryPublic: %@ from %@", recoveryKeyString, oldRecoveryKeyString);
});
});
rkbg = SOSRecoveryKeyBagCreateForAccount(kCFAllocatorDefault, account, pubData, error);
require_quiet(rkbg, exit);
result = SOSAccountSetKeybagForRecoveryRing(account, rkbg, error);
SOSAccountSetRecoveryKeyBagEntry(kCFAllocatorDefault, account, rkbg, NULL);
account->circle_rings_retirements_need_attention = true;
exit:
CFReleaseNull(oldRecoveryKey);
CFReleaseNull(rkbg);
SOSClearErrorIfTrue(result, error);
if (!result) {
secnotice("recovery", "SetRecoveryPublic Failed: %@", error ? (CFTypeRef) *error : (CFTypeRef) CFSTR("No error space"));
}
return result;
}
bool SOSAccountRecoveryKeyIsInBackupAndCurrentInView(SOSAccountRef account, CFStringRef viewname) {
bool result = false;
CFErrorRef bsError = NULL;
CFDataRef backupSliceData = NULL;
SOSRingRef ring = NULL;
SOSBackupSliceKeyBagRef backupSlice = NULL;
CFDataRef rkbg = SOSAccountCopyRecoveryPublic(kCFAllocatorDefault, account, NULL);
require_quiet(rkbg, errOut);
CFStringRef ringName = SOSBackupCopyRingNameForView(viewname);
ring = SOSAccountCopyRing(account, ringName, &bsError);
CFReleaseNull(ringName);
require_quiet(ring, errOut);
backupSliceData = SOSRingGetPayload(ring, &bsError);
require_quiet(backupSliceData, errOut);
backupSlice = SOSBackupSliceKeyBagCreateFromData(kCFAllocatorDefault, backupSliceData, &bsError);
require_quiet(backupSlice, errOut);
result = SOSBKSBPrefixedKeyIsInKeyBag(backupSlice, bskbRkbgPrefix, rkbg);
CFReleaseNull(backupSlice);
errOut:
CFReleaseNull(ring);
CFReleaseNull(rkbg);
if (bsError) {
secnotice("backup", "Failed to find BKSB: %@, %@ (%@)", backupSliceData, backupSlice, bsError);
}
CFReleaseNull(bsError);
return result;
}
static void sosRecoveryAlertAndNotify(SOSAccountRef account, SOSRecoveryKeyBagRef oldRingRKBG, SOSRecoveryKeyBagRef ringRKBG) {
secnotice("recovery", "Recovery Key changed: old %@ new %@", oldRingRKBG, ringRKBG);
notify_post(kSOSCCRecoveryKeyChanged);
}
void SOSAccountEnsureRecoveryRing(SOSAccountRef account) {
static SOSRecoveryKeyBagRef oldRingRKBG = NULL;
bool inCircle = SOSAccountIsInCircle(account, NULL);
CFStringRef accountDSID = SOSAccountGetValue(account, kSOSDSIDKey, NULL); SOSRecoveryKeyBagRef acctRKBG = SOSAccountCopyRecoveryKeyBagEntry(kCFAllocatorDefault, account, NULL);
SOSRecoveryKeyBagRef ringRKBG = SOSAccountCopyRecoveryKeyBag(kCFAllocatorDefault, account, NULL);
if(!SOSRecoveryKeyBagDSIDIs(ringRKBG, accountDSID)) CFReleaseNull(ringRKBG);
if(!SOSRecoveryKeyBagDSIDIs(acctRKBG, accountDSID)) CFReleaseNull(acctRKBG);
if(inCircle && acctRKBG == NULL && ringRKBG == NULL) {
} else if(inCircle && acctRKBG == NULL) { secnotice("recovery", "Harvesting account recovery key from ring");
SOSAccountSetRecoveryKeyBagEntry(kCFAllocatorDefault, account, ringRKBG, NULL);
} else if(ringRKBG == NULL) {
secnotice("recovery", "Account has a recovery key, but none found in recovery ring");
} else if(!CFEqual(acctRKBG, ringRKBG)) {
secnotice("recovery", "Harvesting account recovery key from ring");
SOSAccountSetRecoveryKeyBagEntry(kCFAllocatorDefault, account, ringRKBG, NULL);
}
if(!CFEqualSafe(oldRingRKBG, ringRKBG)) {
sosRecoveryAlertAndNotify(account, oldRingRKBG, ringRKBG);
CFTransferRetained(oldRingRKBG, ringRKBG);
}
CFReleaseNull(ringRKBG);
CFReleaseNull(acctRKBG);
}