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#
# Module for simulation of utility "getent group -s sss" from coreutils
#
# Copyright (c) 2016 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
from ctypes import (c_int, c_char_p, c_ulong, POINTER, Structure,
create_string_buffer)
from sssd_nss import NssReturnCode, SssdNssError, nss_sss_ctypes_loader
GROUP_BUFLEN = 1024
class Group(Structure):
_fields_ = [("gr_name", c_char_p),
("gr_passwd", c_char_p),
("gr_gid", c_int),
("gr_mem", POINTER(c_char_p))]
def getgrnam_r(name, result_p, buffer_p, buflen):
"""
ctypes wrapper for:
enum nss_status _nss_sss_getgrnam_r(const char *name,
struct group *result,
char *buffer,
size_t buflen,
int *errnop)
"""
func = nss_sss_ctypes_loader("_nss_sss_getgrnam_r")
func.restype = c_int
func.argtypes = [c_char_p, POINTER(Group),
c_char_p, c_ulong, POINTER(c_int)]
errno = POINTER(c_int)(c_int(0))
name = name.encode('utf-8')
res = func(c_char_p(name), result_p, buffer_p, buflen, errno)
return (int(res), int(errno[0]), result_p)
def getgrgid_r(gid, result_p, buffer_p, buflen):
"""
ctypes wrapper for:
enum nss_status _nss_sss_getgrgid_r(gid_t gid,
struct passwd *result,
char *buffer,
size_t buflen,
int *errnop)
"""
func = nss_sss_ctypes_loader("_nss_sss_getgrgid_r")
func.restype = c_int
func.argtypes = [c_ulong, POINTER(Group),
c_char_p, c_ulong, POINTER(c_int)]
errno = POINTER(c_int)(c_int(0))
res = func(gid, result_p, buffer_p, buflen, errno)
return (int(res), int(errno[0]), result_p)
def set_group_dict(res, result_p):
if res != NssReturnCode.SUCCESS:
return dict()
group_dict = dict()
group_dict['name'] = result_p[0].gr_name.decode('utf-8')
group_dict['gid'] = result_p[0].gr_gid
group_dict['mem'] = list()
i = 0
while result_p[0].gr_mem[i] is not None:
grp_name = result_p[0].gr_mem[i].decode('utf-8')
group_dict['mem'].append(grp_name)
i = i + 1
return group_dict
def call_sssd_getgrnam(name):
"""
A Python wrapper to retrieve a group by name. Returns:
(res, group_dict)
if res is NssReturnCode.SUCCESS, then group_dict contains the keys
corresponding to the C passwd structure fields. Otherwise, the dictionary
is empty and errno indicates the error code
"""
result = Group()
result_p = POINTER(Group)(result)
buff = create_string_buffer(GROUP_BUFLEN)
res, errno, result_p = getgrnam_r(name, result_p, buff, GROUP_BUFLEN)
if errno != 0:
raise SssdNssError(errno, "getgrnam_r")
group_dict = set_group_dict(res, result_p)
return res, group_dict
def call_sssd_getgrgid(gid):
"""
A Python wrapper to retrieve a group by GID. Returns:
(res, group_dict)
if res is NssReturnCode.SUCCESS, then group_dict contains the keys
corresponding to the C passwd structure fields. Otherwise, the dictionary
is empty and errno indicates the error code
"""
result = Group()
result_p = POINTER(Group)(result)
buff = create_string_buffer(GROUP_BUFLEN)
res, errno, result_p = getgrgid_r(gid, result_p, buff, GROUP_BUFLEN)
if errno != 0:
raise SssdNssError(errno, "getgrgid_r")
group_dict = set_group_dict(res, result_p)
return res, group_dict
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