From 6636cbff81061bc270e4d21659fa3fba8eb3c87b Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Fri, 12 Apr 2013 18:44:55 +0200 Subject: Create installation script using distutils --- pam.py | 170 ----------------------------------------------------------------- 1 file changed, 170 deletions(-) delete mode 100644 pam.py (limited to 'pam.py') diff --git a/pam.py b/pam.py deleted file mode 100644 index d72489d..0000000 --- a/pam.py +++ /dev/null @@ -1,170 +0,0 @@ -# (c) 2007 Chris AtLee -# Licensed under the MIT license: -# http://www.opensource.org/licenses/mit-license.php -""" -PAM module for python - -Provides an authenticate function that will allow the caller to authenticate -a user against the Pluggable Authentication Modules (PAM) on the system. - -Implemented using ctypes, so no compilation is necessary. - ---- -modified to work [better] with python3.2, 2011-12-6, david ford, -i haven't paid any attention to making sure things work in python2. there may be -problems in my_conv() ---- -Just some encoding fixes for python3, 2012-01-27 Matthias Schiffer -""" - -import sys -import locale -if sys.version_info >= (3,): - py3k = True -else: - py3k = False - -from ctypes import CDLL, POINTER, Structure, CFUNCTYPE, cast, pointer, sizeof -from ctypes import c_void_p, c_uint, c_char_p, c_char, c_int -from ctypes import memmove -from ctypes.util import find_library - -class PamHandle(Structure): - """wrapper class for pam_handle_t""" - _fields_ = [ - ("handle", c_void_p) - ] - - def __init__(self): - Structure.__init__(self) - self.handle = 0 - -class PamMessage(Structure): - """wrapper class for pam_message structure""" - _fields_ = [ - ("msg_style", c_int), - ("msg", c_char_p), - ] - - def __repr__(self): - return "" % (self.msg_style, self.msg) - -class PamResponse(Structure): - """wrapper class for pam_response structure""" - _fields_ = [ - ("resp", c_char_p), - ("resp_retcode", c_int), - ] - - def __repr__(self): - return "" % (self.resp_retcode, self.resp) - -CONV_FUNC = CFUNCTYPE( - c_int, - c_int, - POINTER(POINTER(PamMessage)), - POINTER(POINTER(PamResponse)), - c_void_p) - -class PamConv(Structure): - """wrapper class for pam_conv structure""" - _fields_ = [ - ("conv", CONV_FUNC), - ("appdata_ptr", c_void_p) - ] - -# Various constants -PAM_PROMPT_ECHO_OFF = 1 -PAM_PROMPT_ECHO_ON = 2 -PAM_ERROR_MSG = 3 -PAM_TEXT_INFO = 4 - -LIBC = CDLL(find_library("c")) -LIBPAM = CDLL(find_library("pam")) - -CALLOC = LIBC.calloc -CALLOC.restype = c_void_p -CALLOC.argtypes = [c_uint, c_uint] - -PAM_START = LIBPAM.pam_start -PAM_START.restype = c_int -PAM_START.argtypes = [c_char_p, c_char_p, POINTER(PamConv), POINTER(PamHandle)] - -PAM_STRERROR = LIBPAM.pam_strerror -PAM_STRERROR.restype = c_char_p -PAM_STRERROR.argtypes = [POINTER(PamHandle), c_int] - -PAM_AUTHENTICATE = LIBPAM.pam_authenticate -PAM_AUTHENTICATE.restype = c_int -PAM_AUTHENTICATE.argtypes = [PamHandle, c_int] - -class pam(): - code = 0 - reason = None - - def __init__(self): - pass - - def authenticate(self, username, password, service='login'): - """username and password authenticate for the given service. - - Returns True for success, or False. self.code is the integer - value representing the numerice failure reason, or 0 on success. - self.reason is the textual reason. - - Python3 expects bytes() for ctypes inputs. This function will make - necessary conversions using the latin-1 coding. - - username: the username to authenticate - password: the password in plain text - service: the PAM service to authenticate against. - Defaults to 'login' """ - - @CONV_FUNC - def my_conv(n_messages, messages, p_response, app_data): - """Simple conversation function that responds to any - prompt where the echo is off with the supplied password""" - # Create an array of n_messages response objects - addr = CALLOC(n_messages, sizeof(PamResponse)) - p_response[0] = cast(addr, POINTER(PamResponse)) - for i in range(n_messages): - if messages[i].contents.msg_style == PAM_PROMPT_ECHO_OFF: - cs = c_char_p(password) - dst = CALLOC(sizeof(c_char_p), len(password)+1) - memmove(dst , cs, len(password)) - p_response.contents[i].resp = dst - p_response.contents[i].resp_retcode = 0 - return 0 - - # python3 ctypes prefers bytes, pretend everyone will be happy using latin-1 - if py3k: - if isinstance(username, str): - username = bytes(username, locale.getpreferredencoding()) - if isinstance(password, str): - password = bytes(password, locale.getpreferredencoding()) - if isinstance(service, str): - service = bytes(service, locale.getpreferredencoding()) - - handle = PamHandle() - conv = PamConv(my_conv, 0) - retval = PAM_START(service, username, pointer(conv), pointer(handle)) - - if retval != 0: - # This is not an authentication error, something has gone wrong starting up PAM - self.code = retval - self.reason = str(PAM_STRERROR(pointer(handle), retval), locale.getpreferredencoding()) - return False - - retval = PAM_AUTHENTICATE(handle, 0) - - if retval == 0: - # success - logic = True - else: - logic = False - - # store information to inform the caller why we failed - self.code = retval - self.reason = str(PAM_STRERROR(pointer(handle), retval), locale.getpreferredencoding()) - - return logic -- cgit v1.2.3