+++ /dev/null
-;;; ntlm.el --- NTLM (NT LanManager) authentication support
-
-;; Copyright (C) 2001, 2007 Free Software Foundation, Inc.
-
-;; Author: Taro Kawagishi <tarok@transpulse.org>
-;; Keywords: NTLM, SASL
-;; Version: 1.00
-;; Created: February 2001
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs 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, or (at your option)
-;; any later version.
-
-;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
-
-;;; Commentary:
-
-;; This library is a direct translation of the Samba release 2.2.0
-;; implementation of Windows NT and LanManager compatible password
-;; encryption.
-;;
-;; Interface functions:
-;;
-;; ntlm-build-auth-request
-;; This will return a binary string, which should be used in the
-;; base64 encoded form and it is the caller's responsibility to encode
-;; the returned string with base64.
-;;
-;; ntlm-build-auth-response
-;; It is the caller's responsibility to pass a base64 decoded string
-;; (which will be a binary string) as the first argument and to
-;; encode the returned string with base64. The second argument user
-;; should be given in user@domain format.
-;;
-;; ntlm-get-password-hashes
-;;
-;;
-;; NTLM authentication procedure example:
-;;
-;; 1. Open a network connection to the Exchange server at the IMAP port (143)
-;; 2. Receive an opening message such as:
-;; "* OK Microsoft Exchange IMAP4rev1 server version 5.5.2653.7 (XXXX) ready"
-;; 3. Ask for IMAP server capability by sending "NNN capability"
-;; 4. Receive a capability message such as:
-;; "* CAPABILITY IMAP4 IMAP4rev1 IDLE LITERAL+ LOGIN-REFERRALS MAILBOX-REFERRALS NAMESPACE AUTH=NTLM"
-;; 5. Ask for NTLM authentication by sending a string
-;; "NNN authenticate ntlm"
-;; 6. Receive continuation acknowledgment "+"
-;; 7. Send NTLM authentication request generated by 'ntlm-build-auth-request
-;; 8. Receive NTLM challenge string following acknowledgment "+"
-;; 9. Generate response to challenge by 'ntlm-build-auth-response
-;; (here two hash function values of the user password are encrypted)
-;; 10. Receive authentication completion message such as
-;; "NNN OK AUTHENTICATE NTLM completed."
-
-;;; Code:
-
-(require 'md4)
-
-;;;
-;;; NTLM authentication interface functions
-
-(defun ntlm-build-auth-request (user &optional domain)
- "Return the NTLM authentication request string for USER and DOMAIN.
-USER is a string representing a user name to be authenticated and
-DOMAIN is a NT domain. USER can include a NT domain part as in
-user@domain where the string after @ is used as the domain if DOMAIN
-is not given."
- (interactive)
- (let ((request-ident (concat "NTLMSSP" (make-string 1 0)))
- (request-msgType (concat (make-string 1 1) (make-string 3 0)))
- ;0x01 0x00 0x00 0x00
- (request-flags (concat (make-string 1 7) (make-string 1 178)
- (make-string 2 0)))
- ;0x07 0xb2 0x00 0x00
- lu ld off-d off-u)
- (when (string-match "@" user)
- (unless domain
- (setq domain (substring user (1+ (match-beginning 0)))))
- (setq user (substring user 0 (match-beginning 0))))
- ;; set fields offsets within the request struct
- (setq lu (length user))
- (setq ld (length domain))
- (setq off-u 32) ;offset to the string 'user
- (setq off-d (+ 32 lu)) ;offset to the string 'domain
- ;; pack the request struct in a string
- (concat request-ident ;8 bytes
- request-msgType ;4 bytes
- request-flags ;4 bytes
- (md4-pack-int16 lu) ;user field, count field
- (md4-pack-int16 lu) ;user field, max count field
- (md4-pack-int32 (cons 0 off-u)) ;user field, offset field
- (md4-pack-int16 ld) ;domain field, count field
- (md4-pack-int16 ld) ;domain field, max count field
- (md4-pack-int32 (cons 0 off-d)) ;domain field, offset field
- user ;bufer field
- domain ;bufer field
- )))
-
-(eval-when-compile
- (defmacro ntlm-string-as-unibyte (string)
- (if (fboundp 'string-as-unibyte)
- `(string-as-unibyte ,string)
- string)))
-
-(defun ntlm-build-auth-response (challenge user password-hashes)
- "Return the response string to a challenge string CHALLENGE given by
-the NTLM based server for the user USER and the password hash list
-PASSWORD-HASHES. NTLM uses two hash values which are represented
-by PASSWORD-HASHES. PASSWORD-HASHES should be a return value of
- (list (ntlm-smb-passwd-hash password) (ntlm-md4hash password))"
- (let* ((rchallenge (ntlm-string-as-unibyte challenge))
- ;; get fields within challenge struct
- ;;(ident (substring rchallenge 0 8)) ;ident, 8 bytes
- ;;(msgType (substring rchallenge 8 12)) ;msgType, 4 bytes
- (uDomain (substring rchallenge 12 20)) ;uDomain, 8 bytes
- (flags (substring rchallenge 20 24)) ;flags, 4 bytes
- (challengeData (substring rchallenge 24 32)) ;challengeData, 8 bytes
- uDomain-len uDomain-offs
- ;; response struct and its fields
- lmRespData ;lmRespData, 24 bytes
- ntRespData ;ntRespData, 24 bytes
- domain ;ascii domain string
- lu ld off-lm off-nt off-d off-u off-w off-s)
- ;; extract domain string from challenge string
- (setq uDomain-len (md4-unpack-int16 (substring uDomain 0 2)))
- (setq uDomain-offs (md4-unpack-int32 (substring uDomain 4 8)))
- (setq domain
- (ntlm-unicode2ascii (substring challenge
- (cdr uDomain-offs)
- (+ (cdr uDomain-offs) uDomain-len))
- (/ uDomain-len 2)))
- ;; overwrite domain in case user is given in <user>@<domain> format
- (when (string-match "@" user)
- (setq domain (substring user (1+ (match-beginning 0))))
- (setq user (substring user 0 (match-beginning 0))))
-
- ;; generate response data
- (setq lmRespData
- (ntlm-smb-owf-encrypt (car password-hashes) challengeData))
- (setq ntRespData
- (ntlm-smb-owf-encrypt (cadr password-hashes) challengeData))
-
- ;; get offsets to fields to pack the response struct in a string
- (setq lu (length user))
- (setq ld (length domain))
- (setq off-lm 64) ;offset to string 'lmResponse
- (setq off-nt (+ 64 24)) ;offset to string 'ntResponse
- (setq off-d (+ 64 48)) ;offset to string 'uDomain
- (setq off-u (+ 64 48 (* 2 ld))) ;offset to string 'uUser
- (setq off-w (+ 64 48 (* 2 (+ ld lu)))) ;offset to string 'uWks
- (setq off-s (+ 64 48 (* 2 (+ ld lu lu)))) ;offset to string 'sessionKey
- ;; pack the response struct in a string
- (concat "NTLMSSP\0" ;response ident field, 8 bytes
- (md4-pack-int32 '(0 . 3)) ;response msgType field, 4 bytes
-
- ;; lmResponse field, 8 bytes
- ;;AddBytes(response,lmResponse,lmRespData,24);
- (md4-pack-int16 24) ;len field
- (md4-pack-int16 24) ;maxlen field
- (md4-pack-int32 (cons 0 off-lm)) ;field offset
-
- ;; ntResponse field, 8 bytes
- ;;AddBytes(response,ntResponse,ntRespData,24);
- (md4-pack-int16 24) ;len field
- (md4-pack-int16 24) ;maxlen field
- (md4-pack-int32 (cons 0 off-nt)) ;field offset
-
- ;; uDomain field, 8 bytes
- ;;AddUnicodeString(response,uDomain,domain);
- ;;AddBytes(response, uDomain, udomain, 2*ld);
- (md4-pack-int16 (* 2 ld)) ;len field
- (md4-pack-int16 (* 2 ld)) ;maxlen field
- (md4-pack-int32 (cons 0 off-d)) ;field offset
-
- ;; uUser field, 8 bytes
- ;;AddUnicodeString(response,uUser,u);
- ;;AddBytes(response, uUser, uuser, 2*lu);
- (md4-pack-int16 (* 2 lu)) ;len field
- (md4-pack-int16 (* 2 lu)) ;maxlen field
- (md4-pack-int32 (cons 0 off-u)) ;field offset
-
- ;; uWks field, 8 bytes
- ;;AddUnicodeString(response,uWks,u);
- (md4-pack-int16 (* 2 lu)) ;len field
- (md4-pack-int16 (* 2 lu)) ;maxlen field
- (md4-pack-int32 (cons 0 off-w)) ;field offset
-
- ;; sessionKey field, 8 bytes
- ;;AddString(response,sessionKey,NULL);
- (md4-pack-int16 0) ;len field
- (md4-pack-int16 0) ;maxlen field
- (md4-pack-int32 (cons 0 (- off-s off-lm))) ;field offset
-
- ;; flags field, 4 bytes
- flags ;
-
- ;; buffer field
- lmRespData ;lmResponse, 24 bytes
- ntRespData ;ntResponse, 24 bytes
- (ntlm-ascii2unicode domain ;unicode domain string, 2*ld bytes
- (length domain)) ;
- (ntlm-ascii2unicode user ;unicode user string, 2*lu bytes
- (length user)) ;
- (ntlm-ascii2unicode user ;unicode user string, 2*lu bytes
- (length user)) ;
- )))
-
-(defun ntlm-get-password-hashes (password)
- "Return a pair of SMB hash and NT MD4 hash of the given password PASSWORD"
- (list (ntlm-smb-passwd-hash password)
- (ntlm-md4hash password)))
-
-(defun ntlm-ascii2unicode (str len)
- "Convert an ASCII string into a NT Unicode string, which is
-little-endian utf16."
- (let ((utf (make-string (* 2 len) 0)) (i 0) val)
- (while (and (< i len)
- (not (zerop (setq val (aref str i)))))
- (aset utf (* 2 i) val)
- (aset utf (1+ (* 2 i)) 0)
- (setq i (1+ i)))
- utf))
-
-(defun ntlm-unicode2ascii (str len)
- "Extract 7 bits ASCII part of a little endian utf16 string STR of length LEN."
- (let ((buf (make-string len 0)) (i 0) (j 0))
- (while (< i len)
- (aset buf i (logand (aref str j) 127)) ;(string-to-number "7f" 16)
- (setq i (1+ i)
- j (+ 2 j)))
- buf))
-
-(defun ntlm-smb-passwd-hash (passwd)
- "Return the SMB password hash string of 16 bytes long for the given password
-string PASSWD. PASSWD is truncated to 14 bytes if longer."
- (let ((len (min (length passwd) 14)))
- (ntlm-smb-des-e-p16
- (concat (substring (upcase passwd) 0 len) ;fill top 14 bytes with passwd
- (make-string (- 15 len) 0)))))
-
-(defun ntlm-smb-owf-encrypt (passwd c8)
- "Return the response string of 24 bytes long for the given password
-string PASSWD based on the DES encryption. PASSWD is of at most 14
-bytes long and the challenge string C8 of 8 bytes long."
- (let ((len (min (length passwd) 16)) p22)
- (setq p22 (concat (substring passwd 0 len) ;fill top 16 bytes with passwd
- (make-string (- 22 len) 0)))
- (ntlm-smb-des-e-p24 p22 c8)))
-
-(defun ntlm-smb-des-e-p24 (p22 c8)
- "Return a 24 bytes hashed string for a 21 bytes string P22 and a 8 bytes
-string C8."
- (concat (ntlm-smb-hash c8 p22 t) ;hash first 8 bytes of p22
- (ntlm-smb-hash c8 (substring p22 7) t)
- (ntlm-smb-hash c8 (substring p22 14) t)))
-
-(defconst ntlm-smb-sp8 [75 71 83 33 64 35 36 37])
-
-(defun ntlm-smb-des-e-p16 (p15)
- "Return a 16 bytes hashed string for a 15 bytes string P15."
- (concat (ntlm-smb-hash ntlm-smb-sp8 p15 t) ;hash of first 8 bytes of p15
- (ntlm-smb-hash ntlm-smb-sp8 ;hash of last 8 bytes of p15
- (substring p15 7) t)))
-
-(defun ntlm-smb-hash (in key forw)
- "Return the hash string of length 8 for a string IN of length 8 and
-a string KEY of length 8. FORW is t or nil."
- (let ((out (make-string 8 0))
- outb ;string of length 64
- (inb (make-string 64 0))
- (keyb (make-string 64 0))
- (key2 (ntlm-smb-str-to-key key))
- (i 0) aa)
- (while (< i 64)
- (unless (zerop (logand (aref in (/ i 8)) (lsh 1 (- 7 (% i 8)))))
- (aset inb i 1))
- (unless (zerop (logand (aref key2 (/ i 8)) (lsh 1 (- 7 (% i 8)))))
- (aset keyb i 1))
- (setq i (1+ i)))
- (setq outb (ntlm-smb-dohash inb keyb forw))
- (setq i 0)
- (while (< i 64)
- (unless (zerop (aref outb i))
- (setq aa (aref out (/ i 8)))
- (aset out (/ i 8)
- (logior aa (lsh 1 (- 7 (% i 8))))))
- (setq i (1+ i)))
- out))
-
-(defun ntlm-smb-str-to-key (str)
- "Return a string of length 8 for the given string STR of length 7."
- (let ((key (make-string 8 0))
- (i 7))
- (aset key 0 (lsh (aref str 0) -1))
- (aset key 1 (logior
- (lsh (logand (aref str 0) 1) 6)
- (lsh (aref str 1) -2)))
- (aset key 2 (logior
- (lsh (logand (aref str 1) 3) 5)
- (lsh (aref str 2) -3)))
- (aset key 3 (logior
- (lsh (logand (aref str 2) 7) 4)
- (lsh (aref str 3) -4)))
- (aset key 4 (logior
- (lsh (logand (aref str 3) 15) 3)
- (lsh (aref str 4) -5)))
- (aset key 5 (logior
- (lsh (logand (aref str 4) 31) 2)
- (lsh (aref str 5) -6)))
- (aset key 6 (logior
- (lsh (logand (aref str 5) 63) 1)
- (lsh (aref str 6) -7)))
- (aset key 7 (logand (aref str 6) 127))
- (while (>= i 0)
- (aset key i (lsh (aref key i) 1))
- (setq i (1- i)))
- key))
-
-(defconst ntlm-smb-perm1 [57 49 41 33 25 17 9
- 1 58 50 42 34 26 18
- 10 2 59 51 43 35 27
- 19 11 3 60 52 44 36
- 63 55 47 39 31 23 15
- 7 62 54 46 38 30 22
- 14 6 61 53 45 37 29
- 21 13 5 28 20 12 4])
-
-(defconst ntlm-smb-perm2 [14 17 11 24 1 5
- 3 28 15 6 21 10
- 23 19 12 4 26 8
- 16 7 27 20 13 2
- 41 52 31 37 47 55
- 30 40 51 45 33 48
- 44 49 39 56 34 53
- 46 42 50 36 29 32])
-
-(defconst ntlm-smb-perm3 [58 50 42 34 26 18 10 2
- 60 52 44 36 28 20 12 4
- 62 54 46 38 30 22 14 6
- 64 56 48 40 32 24 16 8
- 57 49 41 33 25 17 9 1
- 59 51 43 35 27 19 11 3
- 61 53 45 37 29 21 13 5
- 63 55 47 39 31 23 15 7])
-
-(defconst ntlm-smb-perm4 [32 1 2 3 4 5
- 4 5 6 7 8 9
- 8 9 10 11 12 13
- 12 13 14 15 16 17
- 16 17 18 19 20 21
- 20 21 22 23 24 25
- 24 25 26 27 28 29
- 28 29 30 31 32 1])
-
-(defconst ntlm-smb-perm5 [16 7 20 21
- 29 12 28 17
- 1 15 23 26
- 5 18 31 10
- 2 8 24 14
- 32 27 3 9
- 19 13 30 6
- 22 11 4 25])
-
-(defconst ntlm-smb-perm6 [40 8 48 16 56 24 64 32
- 39 7 47 15 55 23 63 31
- 38 6 46 14 54 22 62 30
- 37 5 45 13 53 21 61 29
- 36 4 44 12 52 20 60 28
- 35 3 43 11 51 19 59 27
- 34 2 42 10 50 18 58 26
- 33 1 41 9 49 17 57 25])
-
-(defconst ntlm-smb-sc [1 1 2 2 2 2 2 2 1 2 2 2 2 2 2 1])
-
-(defconst ntlm-smb-sbox [[[14 4 13 1 2 15 11 8 3 10 6 12 5 9 0 7]
- [ 0 15 7 4 14 2 13 1 10 6 12 11 9 5 3 8]
- [ 4 1 14 8 13 6 2 11 15 12 9 7 3 10 5 0]
- [15 12 8 2 4 9 1 7 5 11 3 14 10 0 6 13]]
- [[15 1 8 14 6 11 3 4 9 7 2 13 12 0 5 10]
- [ 3 13 4 7 15 2 8 14 12 0 1 10 6 9 11 5]
- [ 0 14 7 11 10 4 13 1 5 8 12 6 9 3 2 15]
- [13 8 10 1 3 15 4 2 11 6 7 12 0 5 14 9]]
- [[10 0 9 14 6 3 15 5 1 13 12 7 11 4 2 8]
- [13 7 0 9 3 4 6 10 2 8 5 14 12 11 15 1]
- [13 6 4 9 8 15 3 0 11 1 2 12 5 10 14 7]
- [ 1 10 13 0 6 9 8 7 4 15 14 3 11 5 2 12]]
- [[ 7 13 14 3 0 6 9 10 1 2 8 5 11 12 4 15]
- [13 8 11 5 6 15 0 3 4 7 2 12 1 10 14 9]
- [10 6 9 0 12 11 7 13 15 1 3 14 5 2 8 4]
- [ 3 15 0 6 10 1 13 8 9 4 5 11 12 7 2 14]]
- [[ 2 12 4 1 7 10 11 6 8 5 3 15 13 0 14 9]
- [14 11 2 12 4 7 13 1 5 0 15 10 3 9 8 6]
- [ 4 2 1 11 10 13 7 8 15 9 12 5 6 3 0 14]
- [11 8 12 7 1 14 2 13 6 15 0 9 10 4 5 3]]
- [[12 1 10 15 9 2 6 8 0 13 3 4 14 7 5 11]
- [10 15 4 2 7 12 9 5 6 1 13 14 0 11 3 8]
- [ 9 14 15 5 2 8 12 3 7 0 4 10 1 13 11 6]
- [ 4 3 2 12 9 5 15 10 11 14 1 7 6 0 8 13]]
- [[ 4 11 2 14 15 0 8 13 3 12 9 7 5 10 6 1]
- [13 0 11 7 4 9 1 10 14 3 5 12 2 15 8 6]
- [ 1 4 11 13 12 3 7 14 10 15 6 8 0 5 9 2]
- [ 6 11 13 8 1 4 10 7 9 5 0 15 14 2 3 12]]
- [[13 2 8 4 6 15 11 1 10 9 3 14 5 0 12 7]
- [ 1 15 13 8 10 3 7 4 12 5 6 11 0 14 9 2]
- [ 7 11 4 1 9 12 14 2 0 6 10 13 15 3 5 8]
- [ 2 1 14 7 4 10 8 13 15 12 9 0 3 5 6 11]]])
-
-(defsubst ntlm-string-permute (in perm n)
- "Return a string of length N for a string IN and a permutation vector
-PERM of size N. The length of IN should be height of PERM."
- (let ((i 0) (out (make-string n 0)))
- (while (< i n)
- (aset out i (aref in (- (aref perm i) 1)))
- (setq i (1+ i)))
- out))
-
-(defsubst ntlm-string-lshift (str count len)
- "Return a string by circularly shifting a string STR by COUNT to the left.
-length of STR is LEN."
- (let ((c (% count len)))
- (concat (substring str c len) (substring str 0 c))))
-
-(defsubst ntlm-string-xor (in1 in2 n)
- "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)
-
-;;; arch-tag: 348ace18-f8e2-4176-8fe9-d9ab4e96f296
-;;; ntlm.el ends here
projects / emacs.git / commitdiff