Open Radar

 
Summary:
When calling SecKeychainCopyAccess() from Swift in Xcode 8.1 instead of a returned SecAccess object with an OSStatus of noErr, no SecAccess is returned and the OSStatus is -4 or "Function or operation not implemented" as returned by SecCopyErrorMessageString(). According to the developer documentation this function is available as of macOS 10.10.

Steps to Reproduce:
1. Create a valid SecKeychain object
2. Create a valid SecAccess reference
3. Call SecKeychainCopyAccess() with previously created SecKeychain and SecAccess as parameters

Expected Results:
A valid SecAccess object is returned, OSStatus of 0 aka noErr

Actual Results:
No SecAccess object is returned, OSStatus returned is -4, "Function or operation not implemented" 

Regression:
The issue occurs on macOS 10.12.2 using Xcode 8.1

Notes:
According to https://developer.apple.com/reference/security/1394733-seckeychaincopyaccess this function has been implemented as of macOS 10.10+ The discussion section further states that it was available as of OS X 10.2 but unimplemented before OS X 10.3. Looking at the available OSS version of SecKeychain.cpp and SecKeychainCopyAccess() at https://opensource.apple.com/source/libsecurity_keychain/libsecurity_keychain-55050.9/lib/SecKeychain.cpp indicates that it is still not implemented as of libsecurity_keychain-55050.9: "MacOSError::throwMe(unimpErr);//%%%for now"