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refactor: clean up parse_perms logic

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Marshall Hallenbeck 2023-10-14 22:13:03 -04:00
parent 5b5ed0c880
commit bc0254d97e
1 changed files with 6 additions and 11 deletions
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17
nxc/modules/daclread.py
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@ -431,17 +431,12 @@ class NXCModule:
# Parses an access mask to extract the different values from a simple permission
# https://stackoverflow.com/questions/28029872/retrieving-security-descriptor-and-getting-number-for-filesystemrights
# - fsr : the access mask to parse
def parse_perms(self, fsr):
_perms = []
for PERM in SIMPLE_PERMISSIONS:
if (fsr & PERM.value) == PERM.value:
_perms.append(PERM.name)
fsr = fsr & (not PERM.value)
for PERM in ACCESS_MASK:
if fsr & PERM.value:
_perms.append(PERM.name)
return _perms
def parse_perms(self, access_mask):
perms = [PERM.name for PERM in SIMPLE_PERMISSIONS if (access_mask & PERM.value) == PERM.value]
# use bitwise NOT operator (~) and sum() function to clear the bits that have been processed
access_mask &= ~sum(PERM.value for PERM in SIMPLE_PERMISSIONS if (access_mask & PERM.value) == PERM.value)
perms += [PERM.name for PERM in ACCESS_MASK if access_mask & PERM.value]
return perms
# Parses a specified ACE and extract the different values (Flags, Access Mask, Trustee, ObjectType, InheritedObjectType)
# - ace : the ACE to parse