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 $"
87 #include <sys/types.h>
91 #include <net/ppp-comp.h>
93 #include <linux/ppp-comp.h>
101 #include "ppp-crypto.h"
107 static void ascii2unicode (char[], int, u_char[]);
108 static void NTPasswordHash (u_char *, int, unsigned char *);
109 static int ChallengeResponse (u_char *, u_char *, u_char*);
110 static void ChapMS_NT (u_char *, char *, int, u_char[24]);
111 static void ChapMS2_NT (u_char *, u_char[16], char *, char *, int,
113 static void GenerateAuthenticatorResponsePlain
114 (char*, int, u_char[24], u_char[16], u_char *,
116 #ifdef PPP_WITH_MSLANMAN
117 static void ChapMS_LANMan (u_char *, char *, int, u_char *);
120 #ifdef PPP_WITH_MSLANMAN
121 bool ms_lanman = 0; /* Use LanMan password instead of NT */
122 /* Has meaning only with MS-CHAP challenges */
128 /* Use "[]|}{?/><,`!2&&(" (sans quotes) for RFC 3079 MS-CHAPv2 test value */
129 static char *mschap_challenge = NULL;
130 /* Use "!@\#$%^&*()_+:3|~" (sans quotes, backslash is to escape #) for ... */
131 static char *mschap2_peer_challenge = NULL;
134 #include "fsm.h" /* Need to poke MPPE options */
139 * Command-line options.
141 static option_t chapms_option_list[] = {
142 #ifdef PPP_WITH_MSLANMAN
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)
200 #ifndef PPP_WITH_MSLANMAN
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);
211 #ifdef PPP_WITH_MSLANMAN
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,
510 u_char ZPasswordHash[21];
516 BZERO(ZPasswordHash, sizeof(ZPasswordHash));
517 BCOPY(PasswordHash, ZPasswordHash, MD4_DIGEST_LENGTH);
520 dbglog("ChallengeResponse - ZPasswordHash %.*B",
521 sizeof(ZPasswordHash), ZPasswordHash);
524 ctx = PPP_CIPHER_CTX_new();
527 if (PPP_CipherInit(ctx, PPP_des_ecb(), ZPasswordHash + 0, NULL, 1)) {
529 if (PPP_CipherUpdate(ctx, response + offset, &outlen, challenge, 8)) {
532 PPP_CIPHER_CTX_set_cipher_data(ctx, ZPasswordHash + 7);
533 if (PPP_CipherUpdate(ctx, response + offset, &outlen, challenge, 8)) {
536 PPP_CIPHER_CTX_set_cipher_data(ctx, ZPasswordHash + 14);
537 if (PPP_CipherUpdate(ctx, response + offset, &outlen, challenge, 8)) {
540 if (PPP_CipherFinal(ctx, response + offset, &outlen)) {
549 PPP_CIPHER_CTX_free(ctx);
553 dbglog("ChallengeResponse - response %.24B", response);
559 ChallengeHash(u_char PeerChallenge[16], u_char *rchallenge,
560 char *username, u_char Challenge[8])
564 u_char hash[SHA_DIGEST_LENGTH];
568 /* remove domain from "domain\username" */
569 if ((user = strrchr(username, '\\')) != NULL)
574 ctx = PPP_MD_CTX_new();
577 if (PPP_DigestInit(ctx, PPP_sha1())) {
579 if (PPP_DigestUpdate(ctx, PeerChallenge, 16)) {
581 if (PPP_DigestUpdate(ctx, rchallenge, 16)) {
583 if (PPP_DigestUpdate(ctx, user, strlen(user))) {
585 hash_len = SHA_DIGEST_LENGTH;
586 if (PPP_DigestFinal(ctx, hash, &hash_len)) {
588 BCOPY(hash, Challenge, 8);
595 PPP_MD_CTX_free(ctx);
600 * Convert the ASCII version of the password to Unicode.
601 * This implicitly supports 8-bit ISO8859/1 characters.
602 * This gives us the little-endian representation, which
603 * is assumed by all M$ CHAP RFCs. (Unicode byte ordering
604 * is machine-dependent.)
607 ascii2unicode(char ascii[], int ascii_len, u_char unicode[])
611 BZERO(unicode, ascii_len * 2);
612 for (i = 0; i < ascii_len; i++)
613 unicode[i * 2] = (u_char) ascii[i];
617 NTPasswordHash(u_char *secret, int secret_len, unsigned char* hash)
619 PPP_MD_CTX* ctx = PPP_MD_CTX_new();
622 if (PPP_DigestInit(ctx, PPP_md4())) {
624 if (PPP_DigestUpdate(ctx, secret, secret_len)) {
626 int hash_len = MD4_DIGEST_LENGTH;
627 PPP_DigestFinal(ctx, hash, &hash_len);
631 PPP_MD_CTX_free(ctx);
636 ChapMS_NT(u_char *rchallenge, char *secret, int secret_len,
637 u_char NTResponse[24])
639 u_char unicodePassword[MAX_NT_PASSWORD * 2];
640 u_char PasswordHash[MD4_DIGEST_LENGTH];
642 /* Hash the Unicode version of the secret (== password). */
643 ascii2unicode(secret, secret_len, unicodePassword);
644 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
646 ChallengeResponse(rchallenge, PasswordHash, NTResponse);
650 ChapMS2_NT(u_char *rchallenge, u_char PeerChallenge[16], char *username,
651 char *secret, int secret_len, u_char NTResponse[24])
653 u_char unicodePassword[MAX_NT_PASSWORD * 2];
654 u_char PasswordHash[MD4_DIGEST_LENGTH];
657 ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
659 /* Hash the Unicode version of the secret (== password). */
660 ascii2unicode(secret, secret_len, unicodePassword);
661 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
663 ChallengeResponse(Challenge, PasswordHash, NTResponse);
666 #ifdef PPP_WITH_MSLANMAN
667 static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
670 ChapMS_LANMan(u_char *rchallenge, char *secret, int secret_len,
671 unsigned char *response)
674 u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
675 u_char PasswordHash[MD4_DIGEST_LENGTH];
677 /* LANMan password is case insensitive */
678 BZERO(UcasePassword, sizeof(UcasePassword));
679 for (i = 0; i < secret_len; i++)
680 UcasePassword[i] = (u_char)toupper(secret[i]);
681 (void) DesSetkey(UcasePassword + 0);
682 DesEncrypt( StdText, PasswordHash + 0 );
683 (void) DesSetkey(UcasePassword + 7);
684 DesEncrypt( StdText, PasswordHash + 8 );
685 ChallengeResponse(rchallenge, PasswordHash, &response[MS_CHAP_LANMANRESP]);
691 GenerateAuthenticatorResponse(unsigned char* PasswordHashHash,
692 unsigned char *NTResponse, unsigned char *PeerChallenge,
693 unsigned char *rchallenge, char *username,
694 unsigned char *authResponse)
697 * "Magic" constants used in response generation, from RFC 2759.
699 u_char Magic1[39] = /* "Magic server to client signing constant" */
700 { 0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
701 0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
702 0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
703 0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74 };
704 u_char Magic2[41] = /* "Pad to make it do more than one iteration" */
705 { 0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
706 0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
707 0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
708 0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
713 u_char Digest[SHA_DIGEST_LENGTH];
717 ctx = PPP_MD_CTX_new();
720 if (PPP_DigestInit(ctx, PPP_sha1())) {
722 if (PPP_DigestUpdate(ctx, PasswordHashHash, MD4_DIGEST_LENGTH)) {
724 if (PPP_DigestUpdate(ctx, NTResponse, 24)) {
726 if (PPP_DigestUpdate(ctx, Magic1, sizeof(Magic1))) {
728 hash_len = sizeof(Digest);
729 PPP_DigestFinal(ctx, Digest, &hash_len);
734 PPP_MD_CTX_free(ctx);
737 ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
739 ctx = PPP_MD_CTX_new();
742 if (PPP_DigestInit(ctx, PPP_sha1())) {
744 if (PPP_DigestUpdate(ctx, Digest, sizeof(Digest))) {
746 if (PPP_DigestUpdate(ctx, Challenge, sizeof(Challenge))) {
748 if (PPP_DigestUpdate(ctx, Magic2, sizeof(Magic2))) {
750 hash_len = sizeof(Digest);
751 PPP_DigestFinal(ctx, Digest, &hash_len);
757 PPP_MD_CTX_free(ctx);
760 /* Convert to ASCII hex string. */
761 for (i = 0; i < MAX((MS_AUTH_RESPONSE_LENGTH / 2), sizeof(Digest)); i++) {
762 sprintf((char *)&authResponse[i * 2], "%02X", Digest[i]);
768 GenerateAuthenticatorResponsePlain
769 (char *secret, int secret_len,
770 u_char NTResponse[24], u_char PeerChallenge[16],
771 u_char *rchallenge, char *username,
772 u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1])
774 u_char unicodePassword[MAX_NT_PASSWORD * 2];
775 u_char PasswordHash[MD4_DIGEST_LENGTH];
776 u_char PasswordHashHash[MD4_DIGEST_LENGTH];
778 /* Hash (x2) the Unicode version of the secret (== password). */
779 ascii2unicode(secret, secret_len, unicodePassword);
780 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
781 NTPasswordHash(PasswordHash, sizeof(PasswordHash),
784 GenerateAuthenticatorResponse(PasswordHashHash, NTResponse, PeerChallenge,
785 rchallenge, username, authResponse);
792 * Set mppe_xxxx_key from MS-CHAP credentials. (see RFC 3079)
795 Set_Start_Key(u_char *rchallenge, char *secret, int secret_len)
797 u_char unicodePassword[MAX_NT_PASSWORD * 2];
798 u_char PasswordHash[MD4_DIGEST_LENGTH];
799 u_char PasswordHashHash[MD4_DIGEST_LENGTH];
801 /* Hash (x2) the Unicode version of the secret (== password). */
802 ascii2unicode(secret, secret_len, unicodePassword);
803 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
804 NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
806 mppe_set_chapv1(rchallenge, PasswordHashHash);
810 * Set mppe_xxxx_key from MS-CHAPv2 credentials. (see RFC 3079)
813 SetMasterKeys(char *secret, int secret_len, u_char NTResponse[24], int IsServer)
815 u_char unicodePassword[MAX_NT_PASSWORD * 2];
816 u_char PasswordHash[MD4_DIGEST_LENGTH];
817 u_char PasswordHashHash[MD4_DIGEST_LENGTH];
818 /* Hash (x2) the Unicode version of the secret (== password). */
819 ascii2unicode(secret, secret_len, unicodePassword);
820 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
821 NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
822 mppe_set_chapv2(PasswordHashHash, NTResponse, IsServer);
825 #endif /* PPP_WITH_MPPE */
829 ChapMS(u_char *rchallenge, char *secret, int secret_len,
830 unsigned char *response)
832 BZERO(response, MS_CHAP_RESPONSE_LEN);
834 ChapMS_NT(rchallenge, secret, secret_len, &response[MS_CHAP_NTRESP]);
836 #ifdef PPP_WITH_MSLANMAN
837 ChapMS_LANMan(rchallenge, secret, secret_len,
838 &response[MS_CHAP_LANMANRESP]);
840 /* preferred method is set by option */
841 response[MS_CHAP_USENT] = !ms_lanman;
843 response[MS_CHAP_USENT] = 1;
847 Set_Start_Key(rchallenge, secret, secret_len);
853 * If PeerChallenge is NULL, one is generated and the PeerChallenge
854 * field of response is filled in. Call this way when generating a response.
855 * If PeerChallenge is supplied, it is copied into the PeerChallenge field.
856 * Call this way when verifying a response (or debugging).
857 * Do not call with PeerChallenge = response.
859 * The PeerChallenge field of response is then used for calculation of the
860 * Authenticator Response.
863 ChapMS2(u_char *rchallenge, u_char *PeerChallenge,
864 char *user, char *secret, int secret_len, unsigned char *response,
865 u_char authResponse[], int authenticator)
868 u_char *p = &response[MS_CHAP2_PEER_CHALLENGE];
871 BZERO(response, MS_CHAP2_RESPONSE_LEN);
873 /* Generate the Peer-Challenge if requested, or copy it if supplied. */
875 for (i = 0; i < MS_CHAP2_PEER_CHAL_LEN; i++)
876 *p++ = (u_char) (drand48() * 0xff);
878 BCOPY(PeerChallenge, &response[MS_CHAP2_PEER_CHALLENGE],
879 MS_CHAP2_PEER_CHAL_LEN);
881 /* Generate the NT-Response */
882 ChapMS2_NT(rchallenge, &response[MS_CHAP2_PEER_CHALLENGE], user,
883 secret, secret_len, &response[MS_CHAP2_NTRESP]);
885 /* Generate the Authenticator Response. */
886 GenerateAuthenticatorResponsePlain(secret, secret_len,
887 &response[MS_CHAP2_NTRESP],
888 &response[MS_CHAP2_PEER_CHALLENGE],
889 rchallenge, user, authResponse);
892 SetMasterKeys(secret, secret_len,
893 &response[MS_CHAP2_NTRESP], authenticator);
898 static struct chap_digest_type chapms_digest = {
899 CHAP_MICROSOFT, /* code */
900 chapms_generate_challenge,
901 chapms_verify_response,
902 chapms_make_response,
903 NULL, /* check_success */
904 chapms_handle_failure,
907 static struct chap_digest_type chapms2_digest = {
908 CHAP_MICROSOFT_V2, /* code */
909 chapms2_generate_challenge,
910 chapms2_verify_response,
911 chapms2_make_response,
912 chapms2_check_success,
913 chapms_handle_failure,
920 chap_register_digest(&chapms_digest);
921 chap_register_digest(&chapms2_digest);
922 add_options(chapms_option_list);
932 void random_bytes(unsigned char *bytes, int len)
937 bytes[i++] = (unsigned char) rand();
942 int test_chap_v1(void) {
943 char *secret = "MyPw";
945 unsigned char challenge[8] = {
946 0x10, 0x2D, 0xB5, 0xDF, 0x08, 0x5D, 0x30, 0x41
948 unsigned char response[MS_CHAP_RESPONSE_LEN] = {
950 unsigned char result[MS_CHAP_RESPONSE_LEN] = {
951 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
952 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
953 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
955 0x4E, 0x9D, 0x3C, 0x8F, 0x9C, 0xFD, 0x38, 0x5D,
956 0x5B, 0xF4, 0xD3, 0x24, 0x67, 0x91, 0x95, 0x6C,
957 0xA4, 0xC3, 0x51, 0xAB, 0x40, 0x9A, 0x3D, 0x61,
962 ChapMS(challenge, secret, strlen(secret), response);
963 return memcmp(response, result, MS_CHAP_RESPONSE_LEN);
966 int test_chap_v2(void) {
967 char *secret = "clientPass";
970 char saresponse[MS_AUTH_RESPONSE_LENGTH+1];
971 char *saresult = "407A5589115FD0D6209F510FE9C04566932CDA56";
973 unsigned char authenticator[16] = {
974 0x5B, 0x5D, 0x7C, 0x7D, 0x7B, 0x3F, 0x2F, 0x3E,
975 0x3C, 0x2C, 0x60, 0x21, 0x32, 0x26, 0x26, 0x28
977 unsigned char peerchallenge[16] = {
978 0x21, 0x40, 0x23, 0x24, 0x25, 0x5E, 0x26, 0x2A,
979 0x28, 0x29, 0x5F, 0x2B, 0x3A, 0x33, 0x7C, 0x7E
981 unsigned char result[MS_CHAP_NTRESP_LEN] = {
982 0x82, 0x30, 0x9E, 0xCD, 0x8D, 0x70, 0x8B, 0x5E,
983 0xA0, 0x8F, 0xAA, 0x39, 0x81, 0xCD, 0x83, 0x54,
984 0x42, 0x33, 0x11, 0x4A, 0x3D, 0x85, 0xD6, 0xDF
987 unsigned char response[MS_CHAP2_RESPONSE_LEN] = {
990 ChapMS2(authenticator, peerchallenge, name,
991 secret, strlen(secret), response,
992 (unsigned char *)saresponse, MS_CHAP2_AUTHENTICATOR);
994 return memcmp(&response[MS_CHAP2_NTRESP], result, MS_CHAP2_NTRESP_LEN) ||
995 strncmp(saresponse, saresult, MS_AUTH_RESPONSE_LENGTH);
998 int main(int argc, char *argv[]) {
1002 if (test_chap_v1()) {
1003 printf("CHAPv1 failed\n");
1007 if (test_chap_v2()) {
1008 printf("CHAPv2 failed\n");
1012 PPP_crypto_deinit();
1014 printf("Success\n");
1018 #endif /* UNIT_TEST */