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e7b1791df3
bandit erroneously flags 'input' based on possible python2-ism. Avoid the error by using 'getinput', making that input or raw_input based on the python version.
258 lines
9.2 KiB
Python
258 lines
9.2 KiB
Python
# Pulled from:
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# https://raw.githubusercontent.com/FirefighterBlu3/python-pam/fe44b334970f421635d9e373b563c9e6566613bd/pam.py
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# and https://github.com/FirefighterBlu3/python-pam/pull/16/files
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# (c) 2007 Chris AtLee <chris@atlee.ca>
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# Licensed under the MIT license:
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# http://www.opensource.org/licenses/mit-license.php
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#
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# Original author: Chris AtLee
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#
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# Modified by David Ford, 2011-12-6
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# added py3 support and encoding
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# added pam_end
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# added pam_setcred to reset credentials after seeing Leon Walker's remarks
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# added byref as well
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# use readline to prestuff the getuser input
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'''
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PAM module for python
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Provides an authenticate function that will allow the caller to authenticate
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a user against the Pluggable Authentication Modules (PAM) on the system.
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Implemented using ctypes, so no compilation is necessary.
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'''
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__all__ = ['pam']
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__version__ = '1.8.4'
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__author__ = 'David Ford <david@blue-labs.org>'
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__released__ = '2018 June 15'
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import sys
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from ctypes import CDLL, POINTER, Structure, CFUNCTYPE, cast, byref, sizeof
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from ctypes import c_void_p, c_size_t, c_char_p, c_char, c_int
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from ctypes import memmove
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from ctypes.util import find_library
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class PamHandle(Structure):
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"""wrapper class for pam_handle_t pointer"""
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_fields_ = [ ("handle", c_void_p) ]
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def __init__(self):
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Structure.__init__(self)
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self.handle = 0
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class PamMessage(Structure):
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"""wrapper class for pam_message structure"""
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_fields_ = [ ("msg_style", c_int), ("msg", c_char_p) ]
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def __repr__(self):
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return "<PamMessage %i '%s'>" % (self.msg_style, self.msg)
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class PamResponse(Structure):
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"""wrapper class for pam_response structure"""
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_fields_ = [ ("resp", c_char_p), ("resp_retcode", c_int) ]
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def __repr__(self):
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return "<PamResponse %i '%s'>" % (self.resp_retcode, self.resp)
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conv_func = CFUNCTYPE(c_int, c_int, POINTER(POINTER(PamMessage)), POINTER(POINTER(PamResponse)), c_void_p)
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class PamConv(Structure):
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"""wrapper class for pam_conv structure"""
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_fields_ = [ ("conv", conv_func), ("appdata_ptr", c_void_p) ]
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# Various constants
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PAM_PROMPT_ECHO_OFF = 1
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PAM_PROMPT_ECHO_ON = 2
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PAM_ERROR_MSG = 3
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PAM_TEXT_INFO = 4
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PAM_REINITIALIZE_CRED = 8
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libc = CDLL(find_library("c"))
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libpam = CDLL(find_library("pam"))
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calloc = libc.calloc
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calloc.restype = c_void_p
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calloc.argtypes = [c_size_t, c_size_t]
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# bug #6 (@NIPE-SYSTEMS), some libpam versions don't include this function
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if hasattr(libpam, 'pam_end'):
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pam_end = libpam.pam_end
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pam_end.restype = c_int
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pam_end.argtypes = [PamHandle, c_int]
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pam_start = libpam.pam_start
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pam_start.restype = c_int
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pam_start.argtypes = [c_char_p, c_char_p, POINTER(PamConv), POINTER(PamHandle)]
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pam_acct_mgmt = libpam.pam_acct_mgmt
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pam_acct_mgmt.restype = c_int
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pam_acct_mgmt.argtypes = [PamHandle, c_int]
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pam_setcred = libpam.pam_setcred
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pam_setcred.restype = c_int
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pam_setcred.argtypes = [PamHandle, c_int]
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pam_strerror = libpam.pam_strerror
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pam_strerror.restype = c_char_p
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pam_strerror.argtypes = [PamHandle, c_int]
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pam_authenticate = libpam.pam_authenticate
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pam_authenticate.restype = c_int
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pam_authenticate.argtypes = [PamHandle, c_int]
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class pam():
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code = 0
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reason = None
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def __init__(self):
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self.prompts = set([])
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def authenticate(self, username, password, service='login', encoding='utf-8', resetcreds=True):
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"""username and password authentication for the given service.
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Returns True for success, or False for failure.
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self.code (integer) and self.reason (string) are always stored and may
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be referenced for the reason why authentication failed. 0/'Success' will
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be stored for success.
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Python3 expects bytes() for ctypes inputs. This function will make
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necessary conversions using the supplied encoding.
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Inputs:
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username: username to authenticate
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password: password in plain text
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service: PAM service to authenticate against, defaults to 'login'
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Returns:
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success: True
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failure: False
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"""
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@conv_func
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def my_conv(n_messages, messages, p_response, app_data):
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"""Simple conversation function that responds to any
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prompt where the echo is off with the supplied password"""
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for i in range(n_messages):
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if messages[i].contents.msg_style == PAM_PROMPT_ECHO_OFF:
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currprompt = messages[i].contents.msg.decode('utf8').strip()
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self.prompts.add(currprompt)
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for i in range(n_messages):
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if messages[i].contents.msg_style == PAM_PROMPT_ECHO_OFF:
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currprompt = messages[i].contents.msg.decode('utf8').strip()
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if isinstance(password, dict):
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if currprompt in password:
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continue
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elif len(self.prompts) > 1:
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return 19 # PAM_CONV_ERR
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else:
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if len(self.prompts) > 1:
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return 19 # PAM_CONV_ERR
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# Create an array of n_messages response objects
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addr = calloc(n_messages, sizeof(PamResponse))
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response = cast(addr, POINTER(PamResponse))
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p_response[0] = response
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for i in range(n_messages):
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if messages[i].contents.msg_style == PAM_PROMPT_ECHO_OFF:
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currprompt = messages[i].contents.msg.decode('utf8').strip()
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if isinstance(password, dict):
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if currprompt in password:
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currpassword = password[currprompt]
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currcpassword = c_char_p(currpassword.encode('utf8'))
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elif len(password) == 1:
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currpassword = list(password.values())[0]
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currcpassword = c_char_p(currpassword.encode('utf8'))
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else:
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currpassword = password
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if not isinstance(currpassword, bytes):
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currpassword = currpassword.encode('utf8')
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currcpassword = c_char_p(currpassword)
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dst = calloc(len(currpassword)+1, sizeof(c_char))
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memmove(dst, currcpassword, len(currpassword))
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response[i].resp = dst
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response[i].resp_retcode = 0
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return 0
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# python3 ctypes prefers bytes
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if sys.version_info >= (3,):
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if isinstance(username, str): username = username.encode(encoding)
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if isinstance(service, str): service = service.encode(encoding)
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else:
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if isinstance(username, unicode):
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username = username.encode(encoding)
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if isinstance(password, unicode):
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password = password.encode(encoding)
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if isinstance(service, unicode):
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service = service.encode(encoding)
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if b'\x00' in username or b'\x00' in service:
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self.code = 4 # PAM_SYSTEM_ERR in Linux-PAM
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self.reason = 'strings may not contain NUL'
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return False
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handle = PamHandle()
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conv = PamConv(my_conv, 0)
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retval = pam_start(service, username, byref(conv), byref(handle))
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if retval != 0:
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# This is not an authentication error, something has gone wrong starting up PAM
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self.code = retval
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self.reason = "pam_start() failed"
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return False
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retval = pam_authenticate(handle, 0)
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auth_success = retval == 0
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if auth_success:
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retval = pam_acct_mgmt(handle, 0)
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auth_success = retval == 0
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if auth_success and resetcreds:
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retval = pam_setcred(handle, PAM_REINITIALIZE_CRED)
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# store information to inform the caller why we failed
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self.code = retval
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self.reason = pam_strerror(handle, retval)
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if sys.version_info >= (3,):
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self.reason = self.reason.decode(encoding)
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if hasattr(libpam, 'pam_end'):
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pam_end(handle, retval)
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return auth_success
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def authenticate(*vargs, **dargs):
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"""
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Compatibility function for older versions of python-pam.
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"""
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return pam().authenticate(*vargs, **dargs)
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if __name__ == "__main__":
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import readline, getpass
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def input_with_prefill(prompt, text):
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def hook():
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readline.insert_text(text)
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readline.redisplay()
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readline.set_pre_input_hook(hook)
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if sys.version_info >= (3,):
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getinput = input
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else:
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getinput = raw_input
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result = getinput(prompt)
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readline.set_pre_input_hook()
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return result
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pam = pam()
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username = input_with_prefill('Username: ', getpass.getuser())
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# enter a valid username and an invalid/valid password, to verify both failure and success
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pam.authenticate(username, getpass.getpass())
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print('{} {}'.format(pam.code, pam.reason)) |