Enumerate all Keychain items in my iOS application

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SecItemCopyMatching is the right call for that. First we build our query dictionary so that the items’ attributes are returned in dictionaries, and that all items are returned:

NSMutableDictionary *query = [NSMutableDictionary dictionaryWithObjectsAndKeys:
    (__bridge id)kCFBooleanTrue, (__bridge id)kSecReturnAttributes,
    (__bridge id)kSecMatchLimitAll, (__bridge id)kSecMatchLimit,
    nil];

As SecItemCopyMatching requires at least the class of the returned SecItems, we create an array with all the classes…

NSArray *secItemClasses = [NSArray arrayWithObjects:
                           (__bridge id)kSecClassGenericPassword,
                           (__bridge id)kSecClassInternetPassword,
                           (__bridge id)kSecClassCertificate,
                           (__bridge id)kSecClassKey,
                           (__bridge id)kSecClassIdentity,
                           nil];

…and for each class, set the class in our query, call SecItemCopyMatching, and log the result.

for (id secItemClass in secItemClasses) {
    [query setObject:secItemClass forKey:(__bridge id)kSecClass];

    CFTypeRef result = NULL;
    SecItemCopyMatching((__bridge CFDictionaryRef)query, &result);
    NSLog(@"%@", (__bridge id)result);
    if (result != NULL) CFRelease(result);
}

In production code, you should check that the OSStatus returned by SecItemCopyMatching is either errSecItemNotFound (no items found) or errSecSuccess (at least one item was found).

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