Eryk Sun added the comment:
Testing based on integrity level doesn't require creating a child process. I'm
attaching a ctypes-based example that defines a context manager that
temporarily sets the integrity level of the current thread's impersonation
token.
To get the impersonation token, I initially tried using ImpersonateSelf /
RevertToSelf, but I was unhappy with how it fails for nested contexts since
RevertToSelf always switches back to the process token. I opted to instead call
OpenThreadToken / OpenProcessToken, DuplicateTokenEx, and SetThreadToken.
I chose to use the WELL_KNOWN_SID_TYPE enum values to get the label SIDs via
CreateWellKnownSid. Note that I omitted the GetLengthSid call when passing the
size of the TOKEN_MANDATORY_LABEL to SetTokenInformation. It only needs the
size of the primary buffer. The SID it points at is a sized structure (i.e.
SubAuthorityCount).
Example:
import winreg
HKLM = winreg.HKEY_LOCAL_MACHINE
subkey = r'SOFTWARE\Microsoft\SystemCertificates\CA'
access = winreg.KEY_ALL_ACCESS
>>> key = winreg.OpenKey(HKLM, subkey, 0, access)
>>> print(key)
<PyHKEY:0x0000000000000178>
>>> key.Close()
Repeat with low integrity level:
>>> with token_integrity_level('low'):
... winreg.OpenKey(HKLM, subkey, 0, access)
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
PermissionError: [WinError 5] Access is denied
A context manager like this could be added to the test helper module that was
proposed in issue 22080. It could also add the ability to impersonate with a
restricted copy of the process token -- like what UAC creates. psexec -l does
this by calling CreateRestrictedToken followed by SetInformationToken for the
TokenIntegrityLevel and TokenDefaultDacl.
----------
Added file: http://bugs.python.org/file41439/integrity_level.py
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<http://bugs.python.org/issue25939>
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