Re: [Pyobjc-dev] Calling SMJobBless with valid AuthorizationRef

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Thanks Mike. I was able to get it working on my end as well. For reference,
here's my code -

# CoreFoundation framework.
_CoreFoundation =
ctypes.cdll.LoadLibrary(ctypes.util.find_library('CoreFoundation'))
_CFStringCreateWithCString = _CoreFoundation.CFStringCreateWithCString
_CFStringCreateWithCString.restype = ctypes.c_void_p
_CFStringCreateWithCString.argtypes = [
    ctypes.c_void_p,
    ctypes.c_void_p,
    ctypes.c_uint32,
]
_CFRelease = _CoreFoundation.CFRelease
_CFRelease.restype = None
_CFRelease.argtypes = [ctypes.c_void_p]
_kCFStringEncodingUTF8 = 0x08000100

# Security framework.
_Security = ctypes.cdll.LoadLibrary(ctypes.util.find_library('Security'))
_AuthorizationCreate = _Security.AuthorizationCreate
_AuthorizationFree = _Security.AuthorizationFree
_kAuthorizationFlagDefaults = 0
_kAuthorizationFlagInteractionAllowed = (1 << 0)
_kAuthorizationFlagExtendRights = (1 << 1)
_kAuthorizationFlagPartialRights = (1 << 2)
_kAuthorizationFlagDestroyRights = (1 << 3)
_kAuthorizationFlagPreAuthorize = (1 << 4)
_kAuthorizationFlagNoData = (1 << 20)

# ServiceManagement framework.
_ServiceManagement =
ctypes.cdll.LoadLibrary(ctypes.util.find_library('ServiceManagement'))
_SMJobBless = _ServiceManagement.SMJobBless
_SMJobBless.restype = ctypes.c_bool
_SMJobBless.argtypes = [
    ctypes.c_void_p,
    ctypes.c_void_p,
    ctypes.c_void_p,
    ctypes.POINTER(ctypes.c_void_p),
]
_kSMDomainSystemLaunchd = ctypes.c_void_p.in_dll(_ServiceManagement,
'kSMDomainSystemLaunchd')
_kSMRightBlessPrivilegedHelper = 'com.apple.ServiceManagement.blesshelper'

class _AuthorizationItem(ctypes.Structure):
    _fields_ = [
        ('name', ctypes.c_char_p),
        ('valueLength', ctypes.c_uint32),
        ('value', ctypes.c_void_p),
        ('flags', ctypes.c_uint32),
    ]

class _AuthorizationRights(ctypes.Structure):
    _fields_ = [
        ('count', ctypes.c_uint32),
        ('items', ctypes.POINTER(_AuthorizationItem)),
    ]

authorization_item = _AuthorizationItem(
    name=_kSMRightBlessPrivilegedHelper,
    valueLength=0,
    value=None,
    flags=0,
)
authorization_rights = _AuthorizationRights(
    count=1,
    items=ctypes.pointer(authorization_item),
)
authorization_flags = (
    _kAuthorizationFlagDefaults
    | _kAuthorizationFlagInteractionAllowed
    | _kAuthorizationFlagPreAuthorize
    | _kAuthorizationFlagExtendRights
)
authorization_ref = ctypes.c_void_p()
status = _AuthorizationCreate(
    ctypes.byref(authorization_rights),
    None,
    authorization_flags,
    ctypes.byref(authorization_ref),
)
if status:
    print('Failed to get rights to install helper, status %d', status)
    return

try:
    executable_label = _CFStringCreateWithCString(
        None,
        b'com.kunalparmar.helper'.encode('utf-8'),
        _kCFStringEncodingUTF8,
    )
    try:
        if _SMJobBless(
            _kSMDomainSystemLaunchd,
            executable_label,
            authorization_ref,
            None,
        ):
            print('Helper installed')
        else:
            print('Failed to install helper')
    finally:
        _CFRelease(executable_label)
finally:
    _AuthorizationFree(authorization_ref, _kAuthorizationFlagDefaults)

On Mon, Nov 5, 2012 at 8:15 AM, Michael McCracken <
mic...@gm...> wrote:

> Hi Kunal, I recently wrote some code to call SMJobBless and SMJobRemove
> using only ctypes.
> This was lots of boilerplate but works reliably.
> It's GPL, so you can see the code here:
> http://bazaar.launchpad.net/~ubuntuone-control-tower/ubuntuone-control-panel/trunk/view/head:/ubuntuone/controlpanel/utils/darwin.py
>
> Please feel free to ask me if you have any questions.
>
> -mike
>
>
> On Mon, Nov 5, 2012 at 1:56 AM, Ronald Oussoren <ron...@ma...>wrote:
>
>>
>> On 5 Nov, 2012, at 2:59, Kunal Parmar <kun...@gm...> wrote:
>>
>> > I'm getting an error when calling SMJobBless - "ValueError:
>> depythonifying 'pointer', got 'LP_c_void_p'". I've tried a few things
>> without luck. Any help will be appreciated.
>>
>> It's currently not easily possible to use ctypes with PyObjC, I've filed
>> an issue in my bitbucket about adding ctypes support to pyobjc <
>> https://bitbucket.org/ronaldoussoren/pyobjc/issue/23/add-ctypes-support>.
>>
>> Anoyingly the Security framework is not easily wrapped using the normal
>> PyObjC mechanism's either, in particular support for C structs that contain
>> pointers is lacking right now. I'll have to experiment a little to see if I
>> can get your example to work properly using some other hacks.
>>
>> Ronald
>>
>>
>> >
>> > Here's my code -
>> >
>> > from ServiceManagement import (
>> >     kSMDomainSystemLaunchd,
>> >     SMJobBless,
>> > )
>> >
>> > security = ctypes.cdll.LoadLibrary(ctypes.util.find_library('Security'))
>> >
>> > class AuthorizationItem(ctypes.Structure):
>> >     _fields_ = [
>> >         ('name', ctypes.c_char_p),
>> >         ('valueLength', ctypes.c_uint32),
>> >         ('value', ctypes.c_void_p),
>> >         ('flags', ctypes.c_uint32),
>> >     ]
>> >
>> > class AuthorizationRights(ctypes.Structure):
>> >     _fields_ = [
>> >         ('count', ctypes.c_uint32),
>> >         ('items', ctypes.POINTER(AuthorizationItem)),
>> >     ]
>> >
>> > authorization_item = AuthorizationItem(
>> >     name='com.apple.ServiceManagement.blesshelper',
>> >     valueLength=0,
>> >     value=None,
>> >     flags=0,
>> > )
>> > authorization_rights = AuthorizationRights(
>> >     count=1,
>> >     items=ctypes.pointer(authorization_item),
>> > )
>> > authorization_flags = 19
>> > authorization_ref = ctypes.POINTER(ctypes.c_void_p)()
>> > status = security.AuthorizationCreate(
>> >     ctypes.pointer(authorization_rights),
>> >     None,
>> >     authorization_flags,
>> >     ctypes.pointer(authorization_ref),
>> > )
>> > SMJobBless(
>> >     kSMDomainSystemLaunchd,
>> >     'app.helper',
>> >     authorization_ref,
>> >     None,
>> > )
>> >
>> ------------------------------------------------------------------------------
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>> http://p.sf.net/sfu/logmein12331_d2d_______________________________________________
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>>
>>
>>
>> ------------------------------------------------------------------------------
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>> Stay in control, update software, and manage PCs from one command center
>> Diagnose problems and improve visibility into emerging IT issues
>> Automate, monitor and manage. Do more in less time with Central
>> http://p.sf.net/sfu/logmein12331_d2d
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>
>