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#! /usr/bin/env python3
#
# Copyright 2023 by Garmin Ltd. or its subsidiaries
#
# SPDX-License-Identifier: MIT
import sys
import ctypes
import os
import errno
import pwd
import grp
libacl = ctypes.CDLL("libacl.so.1", use_errno=True)
ACL_TYPE_ACCESS = 0x8000
ACL_TYPE_DEFAULT = 0x4000
ACL_FIRST_ENTRY = 0
ACL_NEXT_ENTRY = 1
ACL_UNDEFINED_TAG = 0x00
ACL_USER_OBJ = 0x01
ACL_USER = 0x02
ACL_GROUP_OBJ = 0x04
ACL_GROUP = 0x08
ACL_MASK = 0x10
ACL_OTHER = 0x20
ACL_READ = 0x04
ACL_WRITE = 0x02
ACL_EXECUTE = 0x01
acl_t = ctypes.c_void_p
acl_entry_t = ctypes.c_void_p
acl_permset_t = ctypes.c_void_p
acl_perm_t = ctypes.c_uint
acl_tag_t = ctypes.c_int
libacl.acl_free.argtypes = [acl_t]
def acl_free(acl):
libacl.acl_free(acl)
libacl.acl_get_file.restype = acl_t
libacl.acl_get_file.argtypes = [ctypes.c_char_p, ctypes.c_uint]
def acl_get_file(path, typ):
acl = libacl.acl_get_file(os.fsencode(path), typ)
if acl is None:
err = ctypes.get_errno()
raise OSError(err, os.strerror(err), str(path))
return acl
libacl.acl_get_entry.argtypes = [acl_t, ctypes.c_int, ctypes.c_void_p]
def acl_get_entry(acl, entry_id):
entry = acl_entry_t()
ret = libacl.acl_get_entry(acl, entry_id, ctypes.byref(entry))
if ret < 0:
err = ctypes.get_errno()
raise OSError(err, os.strerror(err))
if ret == 0:
return None
return entry
libacl.acl_get_tag_type.argtypes = [acl_entry_t, ctypes.c_void_p]
def acl_get_tag_type(entry_d):
tag = acl_tag_t()
ret = libacl.acl_get_tag_type(entry_d, ctypes.byref(tag))
if ret < 0:
err = ctypes.get_errno()
raise OSError(err, os.strerror(err))
return tag.value
libacl.acl_get_qualifier.restype = ctypes.c_void_p
libacl.acl_get_qualifier.argtypes = [acl_entry_t]
def acl_get_qualifier(entry_d):
ret = libacl.acl_get_qualifier(entry_d)
if ret is None:
err = ctypes.get_errno()
raise OSError(err, os.strerror(err))
return ctypes.c_void_p(ret)
libacl.acl_get_permset.argtypes = [acl_entry_t, ctypes.c_void_p]
def acl_get_permset(entry_d):
permset = acl_permset_t()
ret = libacl.acl_get_permset(entry_d, ctypes.byref(permset))
if ret < 0:
err = ctypes.get_errno()
raise OSError(err, os.strerror(err))
return permset
libacl.acl_get_perm.argtypes = [acl_permset_t, acl_perm_t]
def acl_get_perm(permset_d, perm):
ret = libacl.acl_get_perm(permset_d, perm)
if ret < 0:
err = ctypes.get_errno()
raise OSError(err, os.strerror(err))
return bool(ret)
class Entry(object):
def __init__(self, tag, qualifier, mode):
self.tag = tag
self.qualifier = qualifier
self.mode = mode
def __str__(self):
typ = ""
qual = ""
if self.tag == ACL_USER:
typ = "user"
qual = pwd.getpwuid(self.qualifier).pw_name
elif self.tag == ACL_GROUP:
typ = "group"
qual = grp.getgrgid(self.qualifier).gr_name
elif self.tag == ACL_USER_OBJ:
typ = "user"
elif self.tag == ACL_GROUP_OBJ:
typ = "group"
elif self.tag == ACL_MASK:
typ = "mask"
elif self.tag == ACL_OTHER:
typ = "other"
r = "r" if self.mode & ACL_READ else "-"
w = "w" if self.mode & ACL_WRITE else "-"
x = "x" if self.mode & ACL_EXECUTE else "-"
return f"{typ}:{qual}:{r}{w}{x}"
class ACL(object):
def __init__(self, acl):
self.acl = acl
def __del__(self):
acl_free(self.acl)
def entries(self):
entry_id = ACL_FIRST_ENTRY
while True:
entry = acl_get_entry(self.acl, entry_id)
if entry is None:
break
permset = acl_get_permset(entry)
mode = 0
for m in (ACL_READ, ACL_WRITE, ACL_EXECUTE):
if acl_get_perm(permset, m):
mode |= m
qualifier = None
tag = acl_get_tag_type(entry)
if tag == ACL_USER or tag == ACL_GROUP:
qual = acl_get_qualifier(entry)
qualifier = ctypes.cast(qual, ctypes.POINTER(ctypes.c_int))[0]
yield Entry(tag, qualifier, mode)
entry_id = ACL_NEXT_ENTRY
@classmethod
def from_path(cls, path, typ):
acl = acl_get_file(path, typ)
return cls(acl)
def main():
import argparse
import pwd
import grp
from pathlib import Path
parser = argparse.ArgumentParser()
parser.add_argument("path", help="File Path", type=Path)
args = parser.parse_args()
acl = ACL.from_path(args.path, ACL_TYPE_ACCESS)
for entry in acl.entries():
print(str(entry))
return 0
if __name__ == "__main__":
sys.exit(main())
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