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#
# Module for simulation of utility "getent passwd -s sss" from coreutils
#
# Copyright (c) 2016 Red Hat, Inc.
#
# This 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; version 2 only
#
# 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, get_errno)
from sssd_nss import NssReturnCode, SssdNssError, nss_sss_ctypes_loader
PASSWD_BUFLEN = 1024
class Passwd(Structure):
_fields_ = [("pw_name", c_char_p),
("pw_passwd", c_char_p),
("pw_uid", c_int),
("pw_gid", c_int),
("pw_gecos", c_char_p),
("pw_dir", c_char_p),
("pw_shell", c_char_p)]
def set_user_dict(res, result_p):
if res != NssReturnCode.SUCCESS:
return dict()
user_dict = dict()
user_dict['name'] = result_p[0].pw_name
user_dict['passwd'] = result_p[0].pw_passwd
user_dict['uid'] = result_p[0].pw_uid
user_dict['gid'] = result_p[0].pw_gid
user_dict['gecos'] = result_p[0].pw_gecos
user_dict['dir'] = result_p[0].pw_dir
user_dict['shell'] = result_p[0].pw_shell
return user_dict
def getpwnam_r(name, result_p, buffer_p, buflen):
"""
ctypes wrapper for:
enum nss_status _nss_sss_getpwnam_r(const char *name,
struct passwd *result,
char *buffer,
size_t buflen,
int *errnop)
"""
func = nss_sss_ctypes_loader("_nss_sss_getpwnam_r")
func.restype = c_int
func.argtypes = [c_char_p, POINTER(Passwd),
c_char_p, c_ulong, POINTER(c_int)]
errno = POINTER(c_int)(c_int(0))
res = func(c_char_p(name), result_p, buffer_p, buflen, errno)
return (int(res), int(errno[0]), result_p)
def setpwent():
"""
ctypes wrapper for:
void setpwent(void)
"""
func = nss_sss_ctypes_loader("_nss_sss_setpwent")
func.argtypes = []
res = func()
assert res == NssReturnCode.SUCCESS
errno = get_errno()
if errno != 0:
raise SssdNssError(errno, "setpwent")
def endpwent():
"""
ctypes wrapper for:
void endpwent(void)
"""
func = nss_sss_ctypes_loader("_nss_sss_endpwent")
func.argtypes = []
res = func()
assert res == NssReturnCode.SUCCESS
errno = get_errno()
if errno != 0:
raise SssdNssError(errno, "endpwent")
def getpwent_r(result_p, buffer_p, buflen):
"""
ctypes wrapper for:
enum nss_status _nss_sss_getpwent_r(struct passwd *result,
char *buffer, size_t buflen,
int *errnop)
"""
func = nss_sss_ctypes_loader("_nss_sss_getpwent_r")
func.restype = c_int
func.argtypes = [POINTER(Passwd), c_char_p, c_ulong, POINTER(c_int)]
errno = POINTER(c_int)(c_int(0))
res = func(result_p, buffer_p, buflen, errno)
return (int(res), int(errno[0]), result_p)
def getpwent():
result = Passwd()
result_p = POINTER(Passwd)(result)
buff = create_string_buffer(PASSWD_BUFLEN)
res, errno, result_p = getpwent_r(result_p, buff, PASSWD_BUFLEN)
if errno != 0:
raise SssdNssError(errno, "getpwent_r")
user_dict = set_user_dict(res, result_p)
return res, user_dict
def call_sssd_getpwnam(name):
"""
A Python wrapper to retrieve a user. Returns:
(res, user_dict)
if res is NssReturnCode.SUCCESS, then user_dict contains the keys
corresponding to the C passwd structure fields. Otherwise, the dictionary
is empty and errno indicates the error code
"""
result = Passwd()
result_p = POINTER(Passwd)(result)
buff = create_string_buffer(PASSWD_BUFLEN)
res, errno, result_p = getpwnam_r(name, result_p, buff, PASSWD_BUFLEN)
if errno != 0:
raise SssdNssError(errno, "getpwnam_r")
user_dict = set_user_dict(res, result_p)
return res, user_dict
def call_sssd_enumeration():
"""
enumerate users from sssd module only
"""
setpwent()
user_list = []
res, user = getpwent()
while res == NssReturnCode.SUCCESS:
user_list.append(user)
res, user = getpwent()
endpwent()
return user_list
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