Manipulating the Keychain in macOS via python and pyobjc

pyobjc_keychain.py

from Foundation import NSBundle
import objc, array

# from CoreFoundation import CFGetTypeID
Security = NSBundle.bundleWithPath_('/System/Library/Frameworks/Security.framework')

# First we need the CF TypeIDs to build some signatures
functions = [
             ('SecKeychainGetTypeID', 'I'),
            ]

objc.loadBundleFunctions(Security, globals(), functions)

# Build out our CF type signatures
objc.registerCFSignature('SecKeychainRef', '^{__SecKeychain=}', SecKeychainGetTypeID())

functions = [
             ('SecKeychainCopyDomainSearchList', 'IIo^^{__CFArray}'),
             ('SecKeychainSetDomainSearchList', 'II^{__CFArray}'),
             ('SecKeychainGetPath', 'I^{__SecKeychain=}N^IN^t', '', dict(
               arguments={2: dict(type='N^t', c_array_of_variable_length=True,)})),
             ('SecKeychainOpen', 'I*o^^{__SecKeychain=}'),
             ('SecKeychainGetStatus', 'I^{__SecKeychain=}o^I'),
             ('SecKeychainLock', 'I^{__SecKeychain=}'),
             ('SecKeychainUnlock', 'I^{__SecKeychain=}I*I'),
            ]

# SecKeychainCopySettings
# SecKeychainSetSettings

objc.loadBundleFunctions(Security, globals(), functions)

kSecPreferencesDomainUser    = 0
kSecPreferencesDomainSystem  = 1
kSecPreferencesDomainCommon  = 2
kSecPreferencesDomainDynamic = 3

MAX_PATH = 1024

# Pretty up some of the functions
_SecKeychainGetPath = SecKeychainGetPath
def SecKeychainGetPath(seckeychainref, path_len=None):
    if path_len is None:
        path_len = MAX_PATH
    path_buf = array.array('c','\0'*MAX_PATH)
    err, path_len, path_buf = _SecKeychainGetPath(seckeychainref, path_len, path_buf)
    if err == 0:
        return (err, path_buf[:path_len].tostring())
    return (err, '')

# Example usages
err, keychains = SecKeychainCopyDomainSearchList(kSecPreferencesDomainUser, None)
err, path = SecKeychainGetPath(keychains[0])
err, status = SecKeychainGetStatus(keychains[0],None)
err, keychain = SecKeychainOpen('login.keychain', None)
err, path = SecKeychainGetPath(keychain)

functions = [
    ('SecKeychainOpen', 'I*o^^{__SecKeychain=}'),
    ('SecKeychainUnlock', 'I^{__SecKeychain=}I*I'),
    ('SecKeychainCopySettings', 'I^{__SecKeychain=}o^{SecKeychainSettings}')
]

# ...

SecKeychainSettings = objc.createStructType("SecKeychainSettings", b"{SecKeychainSettings=IBBI}",
                                            ["version", "lockOnSleep", "useLockInterval", "lockInterval"])
objc.createStructAlias("SecKeychainSettings", "{SecKeychainSettings}", SecKeychainSettings)

status, kcsettings = SecKeychainCopySettings(self.ref, None)

print(kcsettings)

Output

<SecKeychainSettings version=0 lockOnSleep=False useLockInterval=False lockInterval=1839023225>

Oh yeah!