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538 lines
19 KiB
EmacsLisp
538 lines
19 KiB
EmacsLisp
;;; ntlm.el --- NTLM (NT LanManager) authentication support
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;; Copyright (C) 2001, 2007-2011 Free Software Foundation, Inc.
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;; Author: Taro Kawagishi <tarok@transpulse.org>
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;; Keywords: NTLM, SASL
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;; Version: 1.00
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;; Created: February 2001
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This library is a direct translation of the Samba release 2.2.0
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;; implementation of Windows NT and LanManager compatible password
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;; encryption.
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;;
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;; Interface functions:
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;;
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;; ntlm-build-auth-request
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;; This will return a binary string, which should be used in the
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;; base64 encoded form and it is the caller's responsibility to encode
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;; the returned string with base64.
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;;
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;; ntlm-build-auth-response
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;; It is the caller's responsibility to pass a base64 decoded string
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;; (which will be a binary string) as the first argument and to
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;; encode the returned string with base64. The second argument user
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;; should be given in user@domain format.
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;;
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;; ntlm-get-password-hashes
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;;
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;;
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;; NTLM authentication procedure example:
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;;
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;; 1. Open a network connection to the Exchange server at the IMAP port (143)
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;; 2. Receive an opening message such as:
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;; "* OK Microsoft Exchange IMAP4rev1 server version 5.5.2653.7 (XXXX) ready"
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;; 3. Ask for IMAP server capability by sending "NNN capability"
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;; 4. Receive a capability message such as:
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;; "* CAPABILITY IMAP4 IMAP4rev1 IDLE LITERAL+ LOGIN-REFERRALS MAILBOX-REFERRALS NAMESPACE AUTH=NTLM"
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;; 5. Ask for NTLM authentication by sending a string
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;; "NNN authenticate ntlm"
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;; 6. Receive continuation acknowledgment "+"
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;; 7. Send NTLM authentication request generated by 'ntlm-build-auth-request
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;; 8. Receive NTLM challenge string following acknowledgment "+"
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;; 9. Generate response to challenge by 'ntlm-build-auth-response
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;; (here two hash function values of the user password are encrypted)
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;; 10. Receive authentication completion message such as
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;; "NNN OK AUTHENTICATE NTLM completed."
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;;; Code:
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(require 'md4)
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;;;
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;;; NTLM authentication interface functions
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(defun ntlm-build-auth-request (user &optional domain)
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"Return the NTLM authentication request string for USER and DOMAIN.
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USER is a string representing a user name to be authenticated and
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DOMAIN is a NT domain. USER can include a NT domain part as in
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user@domain where the string after @ is used as the domain if DOMAIN
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is not given."
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(interactive)
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(let ((request-ident (concat "NTLMSSP" (make-string 1 0)))
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(request-msgType (concat (make-string 1 1) (make-string 3 0)))
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;0x01 0x00 0x00 0x00
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(request-flags (concat (make-string 1 7) (make-string 1 178)
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(make-string 2 0)))
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;0x07 0xb2 0x00 0x00
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lu ld off-d off-u)
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(when (string-match "@" user)
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(unless domain
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(setq domain (substring user (1+ (match-beginning 0)))))
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(setq user (substring user 0 (match-beginning 0))))
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;; set fields offsets within the request struct
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(setq lu (length user))
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(setq ld (length domain))
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(setq off-u 32) ;offset to the string 'user
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(setq off-d (+ 32 lu)) ;offset to the string 'domain
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;; pack the request struct in a string
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(concat request-ident ;8 bytes
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request-msgType ;4 bytes
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request-flags ;4 bytes
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(md4-pack-int16 lu) ;user field, count field
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(md4-pack-int16 lu) ;user field, max count field
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(md4-pack-int32 (cons 0 off-u)) ;user field, offset field
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(md4-pack-int16 ld) ;domain field, count field
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(md4-pack-int16 ld) ;domain field, max count field
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(md4-pack-int32 (cons 0 off-d)) ;domain field, offset field
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user ;bufer field
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domain ;bufer field
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)))
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(eval-when-compile
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(defmacro ntlm-string-as-unibyte (string)
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(if (fboundp 'string-as-unibyte)
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`(string-as-unibyte ,string)
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string)))
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(defun ntlm-build-auth-response (challenge user password-hashes)
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"Return the response string to a challenge string CHALLENGE given by
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the NTLM based server for the user USER and the password hash list
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PASSWORD-HASHES. NTLM uses two hash values which are represented
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by PASSWORD-HASHES. PASSWORD-HASHES should be a return value of
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(list (ntlm-smb-passwd-hash password) (ntlm-md4hash password))"
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(let* ((rchallenge (ntlm-string-as-unibyte challenge))
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;; get fields within challenge struct
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;;(ident (substring rchallenge 0 8)) ;ident, 8 bytes
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;;(msgType (substring rchallenge 8 12)) ;msgType, 4 bytes
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(uDomain (substring rchallenge 12 20)) ;uDomain, 8 bytes
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(flags (substring rchallenge 20 24)) ;flags, 4 bytes
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(challengeData (substring rchallenge 24 32)) ;challengeData, 8 bytes
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uDomain-len uDomain-offs
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;; response struct and its fields
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lmRespData ;lmRespData, 24 bytes
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ntRespData ;ntRespData, 24 bytes
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domain ;ascii domain string
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lu ld off-lm off-nt off-d off-u off-w off-s)
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;; extract domain string from challenge string
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(setq uDomain-len (md4-unpack-int16 (substring uDomain 0 2)))
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(setq uDomain-offs (md4-unpack-int32 (substring uDomain 4 8)))
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(setq domain
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(ntlm-unicode2ascii (substring challenge
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(cdr uDomain-offs)
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(+ (cdr uDomain-offs) uDomain-len))
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(/ uDomain-len 2)))
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;; overwrite domain in case user is given in <user>@<domain> format
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(when (string-match "@" user)
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(setq domain (substring user (1+ (match-beginning 0))))
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(setq user (substring user 0 (match-beginning 0))))
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;; generate response data
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(setq lmRespData
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(ntlm-smb-owf-encrypt (car password-hashes) challengeData))
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(setq ntRespData
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(ntlm-smb-owf-encrypt (cadr password-hashes) challengeData))
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;; get offsets to fields to pack the response struct in a string
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(setq lu (length user))
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(setq ld (length domain))
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(setq off-lm 64) ;offset to string 'lmResponse
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(setq off-nt (+ 64 24)) ;offset to string 'ntResponse
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(setq off-d (+ 64 48)) ;offset to string 'uDomain
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(setq off-u (+ 64 48 (* 2 ld))) ;offset to string 'uUser
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(setq off-w (+ 64 48 (* 2 (+ ld lu)))) ;offset to string 'uWks
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(setq off-s (+ 64 48 (* 2 (+ ld lu lu)))) ;offset to string 'sessionKey
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;; pack the response struct in a string
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(concat "NTLMSSP\0" ;response ident field, 8 bytes
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(md4-pack-int32 '(0 . 3)) ;response msgType field, 4 bytes
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;; lmResponse field, 8 bytes
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;;AddBytes(response,lmResponse,lmRespData,24);
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(md4-pack-int16 24) ;len field
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(md4-pack-int16 24) ;maxlen field
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(md4-pack-int32 (cons 0 off-lm)) ;field offset
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;; ntResponse field, 8 bytes
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;;AddBytes(response,ntResponse,ntRespData,24);
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(md4-pack-int16 24) ;len field
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(md4-pack-int16 24) ;maxlen field
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(md4-pack-int32 (cons 0 off-nt)) ;field offset
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;; uDomain field, 8 bytes
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;;AddUnicodeString(response,uDomain,domain);
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;;AddBytes(response, uDomain, udomain, 2*ld);
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(md4-pack-int16 (* 2 ld)) ;len field
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(md4-pack-int16 (* 2 ld)) ;maxlen field
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(md4-pack-int32 (cons 0 off-d)) ;field offset
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;; uUser field, 8 bytes
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;;AddUnicodeString(response,uUser,u);
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;;AddBytes(response, uUser, uuser, 2*lu);
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(md4-pack-int16 (* 2 lu)) ;len field
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(md4-pack-int16 (* 2 lu)) ;maxlen field
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(md4-pack-int32 (cons 0 off-u)) ;field offset
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;; uWks field, 8 bytes
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;;AddUnicodeString(response,uWks,u);
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(md4-pack-int16 (* 2 lu)) ;len field
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(md4-pack-int16 (* 2 lu)) ;maxlen field
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(md4-pack-int32 (cons 0 off-w)) ;field offset
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;; sessionKey field, 8 bytes
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;;AddString(response,sessionKey,NULL);
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(md4-pack-int16 0) ;len field
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(md4-pack-int16 0) ;maxlen field
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(md4-pack-int32 (cons 0 (- off-s off-lm))) ;field offset
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;; flags field, 4 bytes
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flags ;
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;; buffer field
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lmRespData ;lmResponse, 24 bytes
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ntRespData ;ntResponse, 24 bytes
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(ntlm-ascii2unicode domain ;unicode domain string, 2*ld bytes
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(length domain)) ;
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(ntlm-ascii2unicode user ;unicode user string, 2*lu bytes
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(length user)) ;
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(ntlm-ascii2unicode user ;unicode user string, 2*lu bytes
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(length user)) ;
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)))
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(defun ntlm-get-password-hashes (password)
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"Return a pair of SMB hash and NT MD4 hash of the given password PASSWORD"
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(list (ntlm-smb-passwd-hash password)
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(ntlm-md4hash password)))
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(defun ntlm-ascii2unicode (str len)
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"Convert an ASCII string into a NT Unicode string, which is
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little-endian utf16."
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(let ((utf (make-string (* 2 len) 0)) (i 0) val)
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(while (and (< i len)
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(not (zerop (setq val (aref str i)))))
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(aset utf (* 2 i) val)
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(aset utf (1+ (* 2 i)) 0)
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(setq i (1+ i)))
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utf))
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(defun ntlm-unicode2ascii (str len)
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"Extract 7 bits ASCII part of a little endian utf16 string STR of length LEN."
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(let ((buf (make-string len 0)) (i 0) (j 0))
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(while (< i len)
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(aset buf i (logand (aref str j) 127)) ;(string-to-number "7f" 16)
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(setq i (1+ i)
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j (+ 2 j)))
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buf))
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(defun ntlm-smb-passwd-hash (passwd)
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"Return the SMB password hash string of 16 bytes long for the given password
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string PASSWD. PASSWD is truncated to 14 bytes if longer."
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(let ((len (min (length passwd) 14)))
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(ntlm-smb-des-e-p16
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(concat (substring (upcase passwd) 0 len) ;fill top 14 bytes with passwd
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(make-string (- 15 len) 0)))))
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(defun ntlm-smb-owf-encrypt (passwd c8)
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"Return the response string of 24 bytes long for the given password
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string PASSWD based on the DES encryption. PASSWD is of at most 14
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bytes long and the challenge string C8 of 8 bytes long."
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(let ((len (min (length passwd) 16)) p22)
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(setq p22 (concat (substring passwd 0 len) ;fill top 16 bytes with passwd
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(make-string (- 22 len) 0)))
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(ntlm-smb-des-e-p24 p22 c8)))
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(defun ntlm-smb-des-e-p24 (p22 c8)
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"Return a 24 bytes hashed string for a 21 bytes string P22 and a 8 bytes
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string C8."
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(concat (ntlm-smb-hash c8 p22 t) ;hash first 8 bytes of p22
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(ntlm-smb-hash c8 (substring p22 7) t)
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(ntlm-smb-hash c8 (substring p22 14) t)))
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(defconst ntlm-smb-sp8 [75 71 83 33 64 35 36 37])
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(defun ntlm-smb-des-e-p16 (p15)
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"Return a 16 bytes hashed string for a 15 bytes string P15."
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(concat (ntlm-smb-hash ntlm-smb-sp8 p15 t) ;hash of first 8 bytes of p15
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(ntlm-smb-hash ntlm-smb-sp8 ;hash of last 8 bytes of p15
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(substring p15 7) t)))
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(defun ntlm-smb-hash (in key forw)
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"Return the hash string of length 8 for a string IN of length 8 and
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a string KEY of length 8. FORW is t or nil."
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(let ((out (make-string 8 0))
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outb ;string of length 64
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(inb (make-string 64 0))
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(keyb (make-string 64 0))
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(key2 (ntlm-smb-str-to-key key))
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(i 0) aa)
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(while (< i 64)
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(unless (zerop (logand (aref in (/ i 8)) (lsh 1 (- 7 (% i 8)))))
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(aset inb i 1))
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(unless (zerop (logand (aref key2 (/ i 8)) (lsh 1 (- 7 (% i 8)))))
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(aset keyb i 1))
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(setq i (1+ i)))
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(setq outb (ntlm-smb-dohash inb keyb forw))
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(setq i 0)
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(while (< i 64)
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(unless (zerop (aref outb i))
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(setq aa (aref out (/ i 8)))
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(aset out (/ i 8)
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(logior aa (lsh 1 (- 7 (% i 8))))))
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(setq i (1+ i)))
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out))
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(defun ntlm-smb-str-to-key (str)
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"Return a string of length 8 for the given string STR of length 7."
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(let ((key (make-string 8 0))
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(i 7))
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(aset key 0 (lsh (aref str 0) -1))
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(aset key 1 (logior
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(lsh (logand (aref str 0) 1) 6)
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(lsh (aref str 1) -2)))
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(aset key 2 (logior
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(lsh (logand (aref str 1) 3) 5)
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(lsh (aref str 2) -3)))
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(aset key 3 (logior
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(lsh (logand (aref str 2) 7) 4)
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(lsh (aref str 3) -4)))
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(aset key 4 (logior
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(lsh (logand (aref str 3) 15) 3)
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(lsh (aref str 4) -5)))
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(aset key 5 (logior
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(lsh (logand (aref str 4) 31) 2)
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(lsh (aref str 5) -6)))
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(aset key 6 (logior
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(lsh (logand (aref str 5) 63) 1)
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(lsh (aref str 6) -7)))
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(aset key 7 (logand (aref str 6) 127))
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(while (>= i 0)
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(aset key i (lsh (aref key i) 1))
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(setq i (1- i)))
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key))
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(defconst ntlm-smb-perm1 [57 49 41 33 25 17 9
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1 58 50 42 34 26 18
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10 2 59 51 43 35 27
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19 11 3 60 52 44 36
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63 55 47 39 31 23 15
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7 62 54 46 38 30 22
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14 6 61 53 45 37 29
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21 13 5 28 20 12 4])
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(defconst ntlm-smb-perm2 [14 17 11 24 1 5
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3 28 15 6 21 10
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23 19 12 4 26 8
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16 7 27 20 13 2
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41 52 31 37 47 55
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30 40 51 45 33 48
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44 49 39 56 34 53
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46 42 50 36 29 32])
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(defconst ntlm-smb-perm3 [58 50 42 34 26 18 10 2
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60 52 44 36 28 20 12 4
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62 54 46 38 30 22 14 6
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64 56 48 40 32 24 16 8
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57 49 41 33 25 17 9 1
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59 51 43 35 27 19 11 3
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61 53 45 37 29 21 13 5
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63 55 47 39 31 23 15 7])
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(defconst ntlm-smb-perm4 [32 1 2 3 4 5
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4 5 6 7 8 9
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8 9 10 11 12 13
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12 13 14 15 16 17
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16 17 18 19 20 21
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20 21 22 23 24 25
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24 25 26 27 28 29
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28 29 30 31 32 1])
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(defconst ntlm-smb-perm5 [16 7 20 21
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29 12 28 17
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1 15 23 26
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5 18 31 10
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2 8 24 14
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32 27 3 9
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19 13 30 6
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22 11 4 25])
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(defconst ntlm-smb-perm6 [40 8 48 16 56 24 64 32
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39 7 47 15 55 23 63 31
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38 6 46 14 54 22 62 30
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37 5 45 13 53 21 61 29
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36 4 44 12 52 20 60 28
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35 3 43 11 51 19 59 27
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34 2 42 10 50 18 58 26
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33 1 41 9 49 17 57 25])
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(defconst ntlm-smb-sc [1 1 2 2 2 2 2 2 1 2 2 2 2 2 2 1])
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(defconst ntlm-smb-sbox [[[14 4 13 1 2 15 11 8 3 10 6 12 5 9 0 7]
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[ 0 15 7 4 14 2 13 1 10 6 12 11 9 5 3 8]
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[ 4 1 14 8 13 6 2 11 15 12 9 7 3 10 5 0]
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[15 12 8 2 4 9 1 7 5 11 3 14 10 0 6 13]]
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[[15 1 8 14 6 11 3 4 9 7 2 13 12 0 5 10]
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[ 3 13 4 7 15 2 8 14 12 0 1 10 6 9 11 5]
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[ 0 14 7 11 10 4 13 1 5 8 12 6 9 3 2 15]
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[13 8 10 1 3 15 4 2 11 6 7 12 0 5 14 9]]
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[[10 0 9 14 6 3 15 5 1 13 12 7 11 4 2 8]
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[13 7 0 9 3 4 6 10 2 8 5 14 12 11 15 1]
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[13 6 4 9 8 15 3 0 11 1 2 12 5 10 14 7]
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[ 1 10 13 0 6 9 8 7 4 15 14 3 11 5 2 12]]
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[[ 7 13 14 3 0 6 9 10 1 2 8 5 11 12 4 15]
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[13 8 11 5 6 15 0 3 4 7 2 12 1 10 14 9]
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[10 6 9 0 12 11 7 13 15 1 3 14 5 2 8 4]
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[ 3 15 0 6 10 1 13 8 9 4 5 11 12 7 2 14]]
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[[ 2 12 4 1 7 10 11 6 8 5 3 15 13 0 14 9]
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[14 11 2 12 4 7 13 1 5 0 15 10 3 9 8 6]
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[ 4 2 1 11 10 13 7 8 15 9 12 5 6 3 0 14]
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[11 8 12 7 1 14 2 13 6 15 0 9 10 4 5 3]]
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[[12 1 10 15 9 2 6 8 0 13 3 4 14 7 5 11]
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[10 15 4 2 7 12 9 5 6 1 13 14 0 11 3 8]
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[ 9 14 15 5 2 8 12 3 7 0 4 10 1 13 11 6]
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[ 4 3 2 12 9 5 15 10 11 14 1 7 6 0 8 13]]
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[[ 4 11 2 14 15 0 8 13 3 12 9 7 5 10 6 1]
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[13 0 11 7 4 9 1 10 14 3 5 12 2 15 8 6]
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[ 1 4 11 13 12 3 7 14 10 15 6 8 0 5 9 2]
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[ 6 11 13 8 1 4 10 7 9 5 0 15 14 2 3 12]]
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[[13 2 8 4 6 15 11 1 10 9 3 14 5 0 12 7]
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[ 1 15 13 8 10 3 7 4 12 5 6 11 0 14 9 2]
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[ 7 11 4 1 9 12 14 2 0 6 10 13 15 3 5 8]
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[ 2 1 14 7 4 10 8 13 15 12 9 0 3 5 6 11]]])
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(defsubst ntlm-string-permute (in perm n)
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"Return a string of length N for a string IN and a permutation vector
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PERM of size N. The length of IN should be height of PERM."
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(let ((i 0) (out (make-string n 0)))
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(while (< i n)
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(aset out i (aref in (- (aref perm i) 1)))
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(setq i (1+ i)))
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|
out))
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(defsubst ntlm-string-lshift (str count len)
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|
"Return a string by circularly shifting a string STR by COUNT to the left.
|
|
length of STR is LEN."
|
|
(let ((c (% count len)))
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|
(concat (substring str c len) (substring str 0 c))))
|
|
|
|
(defsubst ntlm-string-xor (in1 in2 n)
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|
"Return exclusive-or of sequences in1 and in2"
|
|
(let ((w (make-string n 0)) (i 0))
|
|
(while (< i n)
|
|
(aset w i (logxor (aref in1 i) (aref in2 i)))
|
|
(setq i (1+ i)))
|
|
w))
|
|
|
|
(defun ntlm-smb-dohash (in key forw)
|
|
"Return the hash value for a string IN and a string KEY.
|
|
Length of IN and KEY are 64. FORW non nill means forward, nil means
|
|
backward."
|
|
(let (pk1 ;string of length 56
|
|
c ;string of length 28
|
|
d ;string of length 28
|
|
cd ;string of length 56
|
|
(ki (make-vector 16 0)) ;vector of string of length 48
|
|
pd1 ;string of length 64
|
|
l ;string of length 32
|
|
r ;string of length 32
|
|
rl ;string of length 64
|
|
(i 0) (j 0) (k 0))
|
|
(setq pk1 (ntlm-string-permute key ntlm-smb-perm1 56))
|
|
(setq c (substring pk1 0 28))
|
|
(setq d (substring pk1 28 56))
|
|
|
|
(setq i 0)
|
|
(while (< i 16)
|
|
(setq c (ntlm-string-lshift c (aref ntlm-smb-sc i) 28))
|
|
(setq d (ntlm-string-lshift d (aref ntlm-smb-sc i) 28))
|
|
(setq cd (concat (substring c 0 28) (substring d 0 28)))
|
|
(aset ki i (ntlm-string-permute cd ntlm-smb-perm2 48))
|
|
(setq i (1+ i)))
|
|
|
|
(setq pd1 (ntlm-string-permute in ntlm-smb-perm3 64))
|
|
|
|
(setq l (substring pd1 0 32))
|
|
(setq r (substring pd1 32 64))
|
|
|
|
(setq i 0)
|
|
(let (er ;string of length 48
|
|
erk ;string of length 48
|
|
(b (make-vector 8 0)) ;vector of strings of length 6
|
|
cb ;string of length 32
|
|
pcb ;string of length 32
|
|
r2 ;string of length 32
|
|
jj m n bj sbox-jmn)
|
|
(while (< i 16)
|
|
(setq er (ntlm-string-permute r ntlm-smb-perm4 48))
|
|
(setq erk (ntlm-string-xor er
|
|
(aref ki (if forw i (- 15 i)))
|
|
48))
|
|
(setq j 0)
|
|
(while (< j 8)
|
|
(setq jj (* 6 j))
|
|
(aset b j (substring erk jj (+ jj 6)))
|
|
(setq j (1+ j)))
|
|
(setq j 0)
|
|
(while (< j 8)
|
|
(setq bj (aref b j))
|
|
(setq m (logior (lsh (aref bj 0) 1) (aref bj 5)))
|
|
(setq n (logior (lsh (aref bj 1) 3)
|
|
(lsh (aref bj 2) 2)
|
|
(lsh (aref bj 3) 1)
|
|
(aref bj 4)))
|
|
(setq k 0)
|
|
(setq sbox-jmn (aref (aref (aref ntlm-smb-sbox j) m) n))
|
|
(while (< k 4)
|
|
(aset bj k
|
|
(if (zerop (logand sbox-jmn (lsh 1 (- 3 k))))
|
|
0 1))
|
|
(setq k (1+ k)))
|
|
(setq j (1+ j)))
|
|
|
|
(setq j 0)
|
|
(setq cb nil)
|
|
(while (< j 8)
|
|
(setq cb (concat cb (substring (aref b j) 0 4)))
|
|
(setq j (1+ j)))
|
|
|
|
(setq pcb (ntlm-string-permute cb ntlm-smb-perm5 32))
|
|
(setq r2 (ntlm-string-xor l pcb 32))
|
|
(setq l r)
|
|
(setq r r2)
|
|
(setq i (1+ i))))
|
|
(setq rl (concat r l))
|
|
(ntlm-string-permute rl ntlm-smb-perm6 64)))
|
|
|
|
(defun ntlm-md4hash (passwd)
|
|
"Return the 16 bytes MD4 hash of a string PASSWD after converting it
|
|
into a Unicode string. PASSWD is truncated to 128 bytes if longer."
|
|
(let (len wpwd)
|
|
;; Password cannot be longer than 128 characters
|
|
(setq len (length passwd))
|
|
(if (> len 128)
|
|
(setq len 128))
|
|
;; Password must be converted to NT unicode
|
|
(setq wpwd (ntlm-ascii2unicode passwd len))
|
|
;; Calculate length in bytes
|
|
(setq len (* len 2))
|
|
(md4 wpwd len)))
|
|
|
|
(provide 'ntlm)
|
|
|
|
;;; ntlm.el ends here
|