2 * chap_ms.c - Microsoft MS-CHAP compatible implementation.
4 * Copyright (c) 1995 Eric Rosenquist. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. The name(s) of the authors of this software must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission.
22 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
23 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
24 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
26 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
27 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
28 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
32 * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
34 * Implemented LANManager type password response to MS-CHAP challenges.
35 * Now pppd provides both NT style and LANMan style blocks, and the
36 * prefered is set by option "ms-lanman". Default is to use NT.
37 * The hash text (StdText) was taken from Win95 RASAPI32.DLL.
39 * You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
43 * Modifications by Frank Cusack, frank@google.com, March 2002.
45 * Implemented MS-CHAPv2 functionality, heavily based on sample
46 * implementation in RFC 2759. Implemented MPPE functionality,
47 * heavily based on sample implementation in RFC 3079.
49 * Copyright (c) 2002 Google, Inc. All rights reserved.
51 * Redistribution and use in source and binary forms, with or without
52 * modification, are permitted provided that the following conditions
55 * 1. Redistributions of source code must retain the above copyright
56 * notice, this list of conditions and the following disclaimer.
58 * 2. Redistributions in binary form must reproduce the above copyright
59 * notice, this list of conditions and the following disclaimer in
60 * the documentation and/or other materials provided with the
63 * 3. The name(s) of the authors of this software must not be used to
64 * endorse or promote products derived from this software without
65 * prior written permission.
67 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
68 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
69 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
70 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
71 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
72 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
73 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
77 #define RCSID "$Id: chap_ms.c,v 1.38 2007/12/01 20:10:51 carlsonj Exp $"
89 #include <sys/types.h>
106 static void ascii2unicode (char[], int, u_char[]);
107 static void NTPasswordHash (u_char *, int, u_char[MD4_SIGNATURE_SIZE]);
108 static void ChallengeResponse (u_char *, u_char *, u_char[24]);
109 static void ChapMS_NT (u_char *, char *, int, u_char[24]);
110 static void ChapMS2_NT (u_char *, u_char[16], char *, char *, int,
112 static void GenerateAuthenticatorResponsePlain
113 (char*, int, u_char[24], u_char[16], u_char *,
116 static void ChapMS_LANMan (u_char *, char *, int, u_char *);
120 bool ms_lanman = 0; /* Use LanMan password instead of NT */
121 /* Has meaning only with MS-CHAP challenges */
127 /* Use "[]|}{?/><,`!2&&(" (sans quotes) for RFC 3079 MS-CHAPv2 test value */
128 static char *mschap_challenge = NULL;
129 /* Use "!@\#$%^&*()_+:3|~" (sans quotes, backslash is to escape #) for ... */
130 static char *mschap2_peer_challenge = NULL;
133 #include "fsm.h" /* Need to poke MPPE options */
135 #include <net/ppp-comp.h>
139 * Command-line options.
141 static option_t chapms_option_list[] = {
143 { "ms-lanman", o_bool, &ms_lanman,
144 "Use LanMan passwd when using MS-CHAP", 1 },
147 { "mschap-challenge", o_string, &mschap_challenge,
148 "specify CHAP challenge" },
149 { "mschap2-peer-challenge", o_string, &mschap2_peer_challenge,
150 "specify CHAP peer challenge" },
156 * chapms_generate_challenge - generate a challenge for MS-CHAP.
157 * For MS-CHAP the challenge length is fixed at 8 bytes.
158 * The length goes in challenge[0] and the actual challenge starts
162 chapms_generate_challenge(unsigned char *challenge)
166 if (mschap_challenge && strlen(mschap_challenge) == 8)
167 memcpy(challenge, mschap_challenge, 8);
170 random_bytes(challenge, 8);
174 chapms2_generate_challenge(unsigned char *challenge)
178 if (mschap_challenge && strlen(mschap_challenge) == 16)
179 memcpy(challenge, mschap_challenge, 16);
182 random_bytes(challenge, 16);
186 chapms_verify_response(int id, char *name,
187 unsigned char *secret, int secret_len,
188 unsigned char *challenge, unsigned char *response,
189 char *message, int message_space)
191 unsigned char md[MS_CHAP_RESPONSE_LEN];
193 int challenge_len, response_len;
195 challenge_len = *challenge++; /* skip length, is 8 */
196 response_len = *response++;
197 if (response_len != MS_CHAP_RESPONSE_LEN)
201 if (!response[MS_CHAP_USENT]) {
202 /* Should really propagate this into the error packet. */
203 notice("Peer request for LANMAN auth not supported");
208 /* Generate the expected response. */
209 ChapMS(challenge, (char *)secret, secret_len, md);
212 /* Determine which part of response to verify against */
213 if (!response[MS_CHAP_USENT])
214 diff = memcmp(&response[MS_CHAP_LANMANRESP],
215 &md[MS_CHAP_LANMANRESP], MS_CHAP_LANMANRESP_LEN);
218 diff = memcmp(&response[MS_CHAP_NTRESP], &md[MS_CHAP_NTRESP],
222 slprintf(message, message_space, "Access granted");
227 /* See comments below for MS-CHAP V2 */
228 slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0",
229 challenge_len, challenge);
234 chapms2_verify_response(int id, char *name,
235 unsigned char *secret, int secret_len,
236 unsigned char *challenge, unsigned char *response,
237 char *message, int message_space)
239 unsigned char md[MS_CHAP2_RESPONSE_LEN];
240 char saresponse[MS_AUTH_RESPONSE_LENGTH+1];
241 int challenge_len, response_len;
243 challenge_len = *challenge++; /* skip length, is 16 */
244 response_len = *response++;
245 if (response_len != MS_CHAP2_RESPONSE_LEN)
246 goto bad; /* not even the right length */
248 /* Generate the expected response and our mutual auth. */
249 ChapMS2(challenge, &response[MS_CHAP2_PEER_CHALLENGE], name,
250 (char *)secret, secret_len, md,
251 (unsigned char *)saresponse, MS_CHAP2_AUTHENTICATOR);
253 /* compare MDs and send the appropriate status */
255 * Per RFC 2759, success message must be formatted as
256 * "S=<auth_string> M=<message>"
258 * <auth_string> is the Authenticator Response (mutual auth)
259 * <message> is a text message
261 * However, some versions of Windows (win98 tested) do not know
262 * about the M=<message> part (required per RFC 2759) and flag
263 * it as an error (reported incorrectly as an encryption error
264 * to the user). Since the RFC requires it, and it can be
265 * useful information, we supply it if the peer is a conforming
266 * system. Luckily (?), win98 sets the Flags field to 0x04
267 * (contrary to RFC requirements) so we can use that to
268 * distinguish between conforming and non-conforming systems.
270 * Special thanks to Alex Swiridov <say@real.kharkov.ua> for
271 * help debugging this.
273 if (memcmp(&md[MS_CHAP2_NTRESP], &response[MS_CHAP2_NTRESP],
274 MS_CHAP2_NTRESP_LEN) == 0) {
275 if (response[MS_CHAP2_FLAGS])
276 slprintf(message, message_space, "S=%s", saresponse);
278 slprintf(message, message_space, "S=%s M=%s",
279 saresponse, "Access granted");
285 * Failure message must be formatted as
286 * "E=e R=r C=c V=v M=m"
288 * e = error code (we use 691, ERROR_AUTHENTICATION_FAILURE)
289 * r = retry (we use 1, ok to retry)
290 * c = challenge to use for next response, we reuse previous
291 * v = Change Password version supported, we use 0
294 * The M=m part is only for MS-CHAPv2. Neither win2k nor
295 * win98 (others untested) display the message to the user anyway.
296 * They also both ignore the E=e code.
298 * Note that it's safe to reuse the same challenge as we don't
299 * actually accept another response based on the error message
300 * (and no clients try to resend a response anyway).
302 * Basically, this whole bit is useless code, even the small
303 * implementation here is only because of overspecification.
305 slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0 M=%s",
306 challenge_len, challenge, "Access denied");
311 chapms_make_response(unsigned char *response, int id, char *our_name,
312 unsigned char *challenge, char *secret, int secret_len,
313 unsigned char *private)
315 challenge++; /* skip length, should be 8 */
316 *response++ = MS_CHAP_RESPONSE_LEN;
317 ChapMS(challenge, secret, secret_len, response);
320 struct chapms2_response_cache_entry {
322 unsigned char challenge[16];
323 unsigned char response[MS_CHAP2_RESPONSE_LEN];
324 unsigned char auth_response[MS_AUTH_RESPONSE_LENGTH];
327 #define CHAPMS2_MAX_RESPONSE_CACHE_SIZE 10
328 static struct chapms2_response_cache_entry
329 chapms2_response_cache[CHAPMS2_MAX_RESPONSE_CACHE_SIZE];
330 static int chapms2_response_cache_next_index = 0;
331 static int chapms2_response_cache_size = 0;
334 chapms2_add_to_response_cache(int id, unsigned char *challenge,
335 unsigned char *response,
336 unsigned char *auth_response)
338 int i = chapms2_response_cache_next_index;
340 chapms2_response_cache[i].id = id;
341 memcpy(chapms2_response_cache[i].challenge, challenge, 16);
342 memcpy(chapms2_response_cache[i].response, response,
343 MS_CHAP2_RESPONSE_LEN);
344 memcpy(chapms2_response_cache[i].auth_response,
345 auth_response, MS_AUTH_RESPONSE_LENGTH);
346 chapms2_response_cache_next_index =
347 (i + 1) % CHAPMS2_MAX_RESPONSE_CACHE_SIZE;
348 if (chapms2_response_cache_next_index > chapms2_response_cache_size)
349 chapms2_response_cache_size = chapms2_response_cache_next_index;
350 dbglog("added response cache entry %d", i);
353 static struct chapms2_response_cache_entry*
354 chapms2_find_in_response_cache(int id, unsigned char *challenge,
355 unsigned char *auth_response)
359 for (i = 0; i < chapms2_response_cache_size; i++) {
360 if (id == chapms2_response_cache[i].id
363 chapms2_response_cache[i].challenge,
366 || memcmp(auth_response,
367 chapms2_response_cache[i].auth_response,
368 MS_AUTH_RESPONSE_LENGTH) == 0)) {
369 dbglog("response found in cache (entry %d)", i);
370 return &chapms2_response_cache[i];
373 return NULL; /* not found */
377 chapms2_make_response(unsigned char *response, int id, char *our_name,
378 unsigned char *challenge, char *secret, int secret_len,
379 unsigned char *private)
381 const struct chapms2_response_cache_entry *cache_entry;
382 unsigned char auth_response[MS_AUTH_RESPONSE_LENGTH+1];
384 challenge++; /* skip length, should be 16 */
385 *response++ = MS_CHAP2_RESPONSE_LEN;
386 cache_entry = chapms2_find_in_response_cache(id, challenge, NULL);
388 memcpy(response, cache_entry->response, MS_CHAP2_RESPONSE_LEN);
393 mschap2_peer_challenge,
397 our_name, secret, secret_len, response, auth_response,
398 MS_CHAP2_AUTHENTICATEE);
399 chapms2_add_to_response_cache(id, challenge, response, auth_response);
403 chapms2_check_success(int id, unsigned char *msg, int len)
405 if ((len < MS_AUTH_RESPONSE_LENGTH + 2) ||
406 strncmp((char *)msg, "S=", 2) != 0) {
407 /* Packet does not start with "S=" */
408 error("MS-CHAPv2 Success packet is badly formed.");
413 if (len < MS_AUTH_RESPONSE_LENGTH
414 || !chapms2_find_in_response_cache(id, NULL /* challenge */, msg)) {
415 /* Authenticator Response did not match expected. */
416 error("MS-CHAPv2 mutual authentication failed.");
419 /* Authenticator Response matches. */
420 msg += MS_AUTH_RESPONSE_LENGTH; /* Eat it */
421 len -= MS_AUTH_RESPONSE_LENGTH;
422 if ((len >= 3) && !strncmp((char *)msg, " M=", 3)) {
423 msg += 3; /* Eat the delimiter */
424 } else if ((len >= 2) && !strncmp((char *)msg, "M=", 2)) {
425 msg += 2; /* Eat the delimiter */
427 /* Packet has extra text which does not begin " M=" */
428 error("MS-CHAPv2 Success packet is badly formed.");
435 chapms_handle_failure(unsigned char *inp, int len)
440 /* We want a null-terminated string for strxxx(). */
441 msg = malloc(len + 1);
443 notice("Out of memory in chapms_handle_failure");
446 BCOPY(inp, msg, len);
451 * Deal with MS-CHAP formatted failure messages; just print the
452 * M=<message> part (if any). For MS-CHAP we're not really supposed
453 * to use M=<message>, but it shouldn't hurt. See
454 * chapms[2]_verify_response.
456 if (!strncmp(p, "E=", 2))
457 err = strtol(p+2, NULL, 10); /* Remember the error code. */
459 goto print_msg; /* Message is badly formatted. */
461 if (len && ((p = strstr(p, " M=")) != NULL)) {
462 /* M=<message> field found. */
465 /* No M=<message>; use the error code. */
467 case MS_CHAP_ERROR_RESTRICTED_LOGON_HOURS:
468 p = "E=646 Restricted logon hours";
471 case MS_CHAP_ERROR_ACCT_DISABLED:
472 p = "E=647 Account disabled";
475 case MS_CHAP_ERROR_PASSWD_EXPIRED:
476 p = "E=648 Password expired";
479 case MS_CHAP_ERROR_NO_DIALIN_PERMISSION:
480 p = "E=649 No dialin permission";
483 case MS_CHAP_ERROR_AUTHENTICATION_FAILURE:
484 p = "E=691 Authentication failure";
487 case MS_CHAP_ERROR_CHANGING_PASSWORD:
488 /* Should never see this, we don't support Change Password. */
489 p = "E=709 Error changing password";
494 error("Unknown MS-CHAP authentication failure: %.*v",
501 error("MS-CHAP authentication failed: %v", p);
506 ChallengeResponse(u_char *challenge,
507 u_char PasswordHash[MD4_SIGNATURE_SIZE],
510 u_char ZPasswordHash[21];
512 BZERO(ZPasswordHash, sizeof(ZPasswordHash));
513 BCOPY(PasswordHash, ZPasswordHash, MD4_SIGNATURE_SIZE);
516 dbglog("ChallengeResponse - ZPasswordHash %.*B",
517 sizeof(ZPasswordHash), ZPasswordHash);
520 (void) DesSetkey(ZPasswordHash + 0);
521 DesEncrypt(challenge, response + 0);
522 (void) DesSetkey(ZPasswordHash + 7);
523 DesEncrypt(challenge, response + 8);
524 (void) DesSetkey(ZPasswordHash + 14);
525 DesEncrypt(challenge, response + 16);
528 dbglog("ChallengeResponse - response %.24B", response);
533 ChallengeHash(u_char PeerChallenge[16], u_char *rchallenge,
534 char *username, u_char Challenge[8])
537 SHA1_CTX sha1Context;
538 u_char sha1Hash[SHA1_SIGNATURE_SIZE];
541 /* remove domain from "domain\username" */
542 if ((user = strrchr(username, '\\')) != NULL)
547 SHA1_Init(&sha1Context);
548 SHA1_Update(&sha1Context, PeerChallenge, 16);
549 SHA1_Update(&sha1Context, rchallenge, 16);
550 SHA1_Update(&sha1Context, (unsigned char *)user, strlen(user));
551 SHA1_Final(sha1Hash, &sha1Context);
553 BCOPY(sha1Hash, Challenge, 8);
557 * Convert the ASCII version of the password to Unicode.
558 * This implicitly supports 8-bit ISO8859/1 characters.
559 * This gives us the little-endian representation, which
560 * is assumed by all M$ CHAP RFCs. (Unicode byte ordering
561 * is machine-dependent.)
564 ascii2unicode(char ascii[], int ascii_len, u_char unicode[])
568 BZERO(unicode, ascii_len * 2);
569 for (i = 0; i < ascii_len; i++)
570 unicode[i * 2] = (u_char) ascii[i];
574 NTPasswordHash(u_char *secret, int secret_len, u_char hash[MD4_SIGNATURE_SIZE])
576 #if defined(__NetBSD__) || !defined(USE_MD4)
577 /* NetBSD uses the libc md4 routines which take bytes instead of bits */
578 int mdlen = secret_len;
580 int mdlen = secret_len * 8;
584 MD4Init(&md4Context);
585 #if !defined(USE_MD4)
586 /* Internal MD4Update can take at most 64 bytes at a time */
587 while (mdlen > 512) {
588 MD4Update(&md4Context, secret, 512);
593 MD4Update(&md4Context, secret, mdlen);
594 MD4Final(hash, &md4Context);
599 ChapMS_NT(u_char *rchallenge, char *secret, int secret_len,
600 u_char NTResponse[24])
602 u_char unicodePassword[MAX_NT_PASSWORD * 2];
603 u_char PasswordHash[MD4_SIGNATURE_SIZE];
605 /* Hash the Unicode version of the secret (== password). */
606 ascii2unicode(secret, secret_len, unicodePassword);
607 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
609 ChallengeResponse(rchallenge, PasswordHash, NTResponse);
613 ChapMS2_NT(u_char *rchallenge, u_char PeerChallenge[16], char *username,
614 char *secret, int secret_len, u_char NTResponse[24])
616 u_char unicodePassword[MAX_NT_PASSWORD * 2];
617 u_char PasswordHash[MD4_SIGNATURE_SIZE];
620 ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
622 /* Hash the Unicode version of the secret (== password). */
623 ascii2unicode(secret, secret_len, unicodePassword);
624 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
626 ChallengeResponse(Challenge, PasswordHash, NTResponse);
630 static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
633 ChapMS_LANMan(u_char *rchallenge, char *secret, int secret_len,
634 unsigned char *response)
637 u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
638 u_char PasswordHash[MD4_SIGNATURE_SIZE];
640 /* LANMan password is case insensitive */
641 BZERO(UcasePassword, sizeof(UcasePassword));
642 for (i = 0; i < secret_len; i++)
643 UcasePassword[i] = (u_char)toupper(secret[i]);
644 (void) DesSetkey(UcasePassword + 0);
645 DesEncrypt( StdText, PasswordHash + 0 );
646 (void) DesSetkey(UcasePassword + 7);
647 DesEncrypt( StdText, PasswordHash + 8 );
648 ChallengeResponse(rchallenge, PasswordHash, &response[MS_CHAP_LANMANRESP]);
654 GenerateAuthenticatorResponse(u_char PasswordHashHash[MD4_SIGNATURE_SIZE],
655 u_char NTResponse[24], u_char PeerChallenge[16],
656 u_char *rchallenge, char *username,
657 u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1])
660 * "Magic" constants used in response generation, from RFC 2759.
662 u_char Magic1[39] = /* "Magic server to client signing constant" */
663 { 0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
664 0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
665 0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
666 0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74 };
667 u_char Magic2[41] = /* "Pad to make it do more than one iteration" */
668 { 0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
669 0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
670 0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
671 0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
675 SHA1_CTX sha1Context;
676 u_char Digest[SHA1_SIGNATURE_SIZE];
679 SHA1_Init(&sha1Context);
680 SHA1_Update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
681 SHA1_Update(&sha1Context, NTResponse, 24);
682 SHA1_Update(&sha1Context, Magic1, sizeof(Magic1));
683 SHA1_Final(Digest, &sha1Context);
685 ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
687 SHA1_Init(&sha1Context);
688 SHA1_Update(&sha1Context, Digest, sizeof(Digest));
689 SHA1_Update(&sha1Context, Challenge, sizeof(Challenge));
690 SHA1_Update(&sha1Context, Magic2, sizeof(Magic2));
691 SHA1_Final(Digest, &sha1Context);
693 /* Convert to ASCII hex string. */
694 for (i = 0; i < MAX((MS_AUTH_RESPONSE_LENGTH / 2), sizeof(Digest)); i++)
695 sprintf((char *)&authResponse[i * 2], "%02X", Digest[i]);
700 GenerateAuthenticatorResponsePlain
701 (char *secret, int secret_len,
702 u_char NTResponse[24], u_char PeerChallenge[16],
703 u_char *rchallenge, char *username,
704 u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1])
706 u_char unicodePassword[MAX_NT_PASSWORD * 2];
707 u_char PasswordHash[MD4_SIGNATURE_SIZE];
708 u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
710 /* Hash (x2) the Unicode version of the secret (== password). */
711 ascii2unicode(secret, secret_len, unicodePassword);
712 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
713 NTPasswordHash(PasswordHash, sizeof(PasswordHash),
716 GenerateAuthenticatorResponse(PasswordHashHash, NTResponse, PeerChallenge,
717 rchallenge, username, authResponse);
724 * Set mppe_xxxx_key from MS-CHAP credentials. (see RFC 3079)
727 Set_Start_Key(u_char *rchallenge, char *secret, int secret_len)
729 u_char unicodePassword[MAX_NT_PASSWORD * 2];
730 u_char PasswordHash[MD4_SIGNATURE_SIZE];
731 u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
733 /* Hash (x2) the Unicode version of the secret (== password). */
734 ascii2unicode(secret, secret_len, unicodePassword);
735 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
736 NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
738 mppe_set_chapv1(rchallenge, PasswordHashHash);
742 * Set mppe_xxxx_key from MS-CHAPv2 credentials. (see RFC 3079)
745 SetMasterKeys(char *secret, int secret_len, u_char NTResponse[24], int IsServer)
747 u_char unicodePassword[MAX_NT_PASSWORD * 2];
748 u_char PasswordHash[MD4_SIGNATURE_SIZE];
749 u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
750 /* Hash (x2) the Unicode version of the secret (== password). */
751 ascii2unicode(secret, secret_len, unicodePassword);
752 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
753 NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
754 mppe_set_chapv2(PasswordHashHash, NTResponse, IsServer);
761 ChapMS(u_char *rchallenge, char *secret, int secret_len,
762 unsigned char *response)
764 BZERO(response, MS_CHAP_RESPONSE_LEN);
766 ChapMS_NT(rchallenge, secret, secret_len, &response[MS_CHAP_NTRESP]);
769 ChapMS_LANMan(rchallenge, secret, secret_len,
770 &response[MS_CHAP_LANMANRESP]);
772 /* preferred method is set by option */
773 response[MS_CHAP_USENT] = !ms_lanman;
775 response[MS_CHAP_USENT] = 1;
779 Set_Start_Key(rchallenge, secret, secret_len);
785 * If PeerChallenge is NULL, one is generated and the PeerChallenge
786 * field of response is filled in. Call this way when generating a response.
787 * If PeerChallenge is supplied, it is copied into the PeerChallenge field.
788 * Call this way when verifying a response (or debugging).
789 * Do not call with PeerChallenge = response.
791 * The PeerChallenge field of response is then used for calculation of the
792 * Authenticator Response.
795 ChapMS2(u_char *rchallenge, u_char *PeerChallenge,
796 char *user, char *secret, int secret_len, unsigned char *response,
797 u_char authResponse[], int authenticator)
800 u_char *p = &response[MS_CHAP2_PEER_CHALLENGE];
803 BZERO(response, MS_CHAP2_RESPONSE_LEN);
805 /* Generate the Peer-Challenge if requested, or copy it if supplied. */
807 for (i = 0; i < MS_CHAP2_PEER_CHAL_LEN; i++)
808 *p++ = (u_char) (drand48() * 0xff);
810 BCOPY(PeerChallenge, &response[MS_CHAP2_PEER_CHALLENGE],
811 MS_CHAP2_PEER_CHAL_LEN);
813 /* Generate the NT-Response */
814 ChapMS2_NT(rchallenge, &response[MS_CHAP2_PEER_CHALLENGE], user,
815 secret, secret_len, &response[MS_CHAP2_NTRESP]);
817 /* Generate the Authenticator Response. */
818 GenerateAuthenticatorResponsePlain(secret, secret_len,
819 &response[MS_CHAP2_NTRESP],
820 &response[MS_CHAP2_PEER_CHALLENGE],
821 rchallenge, user, authResponse);
824 SetMasterKeys(secret, secret_len,
825 &response[MS_CHAP2_NTRESP], authenticator);
830 static struct chap_digest_type chapms_digest = {
831 CHAP_MICROSOFT, /* code */
832 chapms_generate_challenge,
833 chapms_verify_response,
834 chapms_make_response,
835 NULL, /* check_success */
836 chapms_handle_failure,
839 static struct chap_digest_type chapms2_digest = {
840 CHAP_MICROSOFT_V2, /* code */
841 chapms2_generate_challenge,
842 chapms2_verify_response,
843 chapms2_make_response,
844 chapms2_check_success,
845 chapms_handle_failure,
852 chap_register_digest(&chapms_digest);
853 chap_register_digest(&chapms2_digest);
854 add_options(chapms_option_list);
864 void random_bytes(unsigned char *bytes, int len)
869 bytes[i++] = (unsigned char) rand();
874 int test_chap_v1(void) {
875 char *secret = "TestPassword";
877 unsigned char challenge[8] = {
878 0x6c, 0x8d, 0x4b, 0xa1, 0x2b, 0x5c, 0x13, 0xc3
880 unsigned char response[MS_CHAP_RESPONSE_LEN] = {
882 unsigned char result[MS_CHAP_RESPONSE_LEN] = {
883 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
884 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
885 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
887 0x91, 0x09, 0x61, 0x5a, 0x0c, 0xac, 0xac, 0x55,
888 0x1f, 0x60, 0xe2, 0x9c, 0x00, 0xac, 0x24, 0xda,
889 0x6e, 0xa5, 0x7b, 0xdb, 0x1d, 0x6a, 0x17, 0xc5,
893 ChapMS(challenge, secret, strlen(secret), response);
894 return memcmp(response, result, MS_CHAP_RESPONSE_LEN);
897 int test_chap_v2(void) {
898 char *secret = "clientPass";
901 char saresponse[MS_AUTH_RESPONSE_LENGTH+1];
902 char *saresult = "407A5589115FD0D6209F510FE9C04566932CDA56";
904 unsigned char authenticator[16] = {
905 0x5B, 0x5D, 0x7C, 0x7D, 0x7B, 0x3F, 0x2F, 0x3E,
906 0x3C, 0x2C, 0x60, 0x21, 0x32, 0x26, 0x26, 0x28
908 unsigned char peerchallenge[16] = {
909 0x21, 0x40, 0x23, 0x24, 0x25, 0x5E, 0x26, 0x2A,
910 0x28, 0x29, 0x5F, 0x2B, 0x3A, 0x33, 0x7C, 0x7E
912 unsigned char result[MS_CHAP_NTRESP_LEN] = {
913 0x82, 0x30, 0x9E, 0xCD, 0x8D, 0x70, 0x8B, 0x5E,
914 0xA0, 0x8F, 0xAA, 0x39, 0x81, 0xCD, 0x83, 0x54,
915 0x42, 0x33, 0x11, 0x4A, 0x3D, 0x85, 0xD6, 0xDF
918 unsigned char response[MS_CHAP2_RESPONSE_LEN] = {
921 ChapMS2(authenticator, peerchallenge, name,
922 secret, strlen(secret), response,
923 (unsigned char *)saresponse, MS_CHAP2_AUTHENTICATOR);
925 return memcmp(&response[MS_CHAP2_NTRESP], result, MS_CHAP2_NTRESP_LEN) ||
926 strncmp(saresponse, saresult, MS_AUTH_RESPONSE_LENGTH);
929 int main(int argc, char *argv[]) {
931 if (test_chap_v1()) {
932 printf("CHAPv1 failed\n");
936 if (test_chap_v2()) {
937 printf("CHAPv2 failed\n");
945 #endif /* UNIT_TEST */