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 $"
87 #include <sys/types.h>
91 #include <net/ppp-comp.h>
93 #include <linux/ppp-comp.h>
96 #include "pppd-private.h"
103 #include "crypto_ms.h"
109 static void ascii2unicode (char[], int, u_char[]);
110 static void NTPasswordHash (u_char *, int, unsigned char *);
111 static int ChallengeResponse (u_char *, u_char *, u_char*);
112 static void ChapMS_NT (u_char *, char *, int, u_char[24]);
113 static void ChapMS2_NT (u_char *, u_char[16], char *, char *, int,
115 static void GenerateAuthenticatorResponsePlain
116 (char*, int, u_char[24], u_char[16], u_char *,
118 #ifdef PPP_WITH_MSLANMAN
119 static void ChapMS_LANMan (u_char *, char *, int, u_char *);
122 #ifdef PPP_WITH_MSLANMAN
123 bool ms_lanman = 0; /* Use LanMan password instead of NT */
124 /* Has meaning only with MS-CHAP challenges */
130 /* Use "[]|}{?/><,`!2&&(" (sans quotes) for RFC 3079 MS-CHAPv2 test value */
131 static char *mschap_challenge = NULL;
132 /* Use "!@\#$%^&*()_+:3|~" (sans quotes, backslash is to escape #) for ... */
133 static char *mschap2_peer_challenge = NULL;
136 #include "fsm.h" /* Need to poke MPPE options */
141 * Command-line options.
143 static struct option chapms_option_list[] = {
144 #ifdef PPP_WITH_MSLANMAN
145 { "ms-lanman", o_bool, &ms_lanman,
146 "Use LanMan passwd when using MS-CHAP", 1 },
149 { "mschap-challenge", o_string, &mschap_challenge,
150 "specify CHAP challenge" },
151 { "mschap2-peer-challenge", o_string, &mschap2_peer_challenge,
152 "specify CHAP peer challenge" },
158 * chapms_generate_challenge - generate a challenge for MS-CHAP.
159 * For MS-CHAP the challenge length is fixed at 8 bytes.
160 * The length goes in challenge[0] and the actual challenge starts
164 chapms_generate_challenge(unsigned char *challenge)
168 if (mschap_challenge && strlen(mschap_challenge) == 8)
169 memcpy(challenge, mschap_challenge, 8);
172 random_bytes(challenge, 8);
176 chapms2_generate_challenge(unsigned char *challenge)
180 if (mschap_challenge && strlen(mschap_challenge) == 16)
181 memcpy(challenge, mschap_challenge, 16);
184 random_bytes(challenge, 16);
188 chapms_verify_response(int id, char *name,
189 unsigned char *secret, int secret_len,
190 unsigned char *challenge, unsigned char *response,
191 char *message, int message_space)
193 unsigned char md[MS_CHAP_RESPONSE_LEN];
195 int challenge_len, response_len;
197 challenge_len = *challenge++; /* skip length, is 8 */
198 response_len = *response++;
199 if (response_len != MS_CHAP_RESPONSE_LEN)
202 #ifndef PPP_WITH_MSLANMAN
203 if (!response[MS_CHAP_USENT]) {
204 /* Should really propagate this into the error packet. */
205 notice("Peer request for LANMAN auth not supported");
210 /* Generate the expected response. */
211 ChapMS(challenge, (char *)secret, secret_len, md);
213 #ifdef PPP_WITH_MSLANMAN
214 /* Determine which part of response to verify against */
215 if (!response[MS_CHAP_USENT])
216 diff = memcmp(&response[MS_CHAP_LANMANRESP],
217 &md[MS_CHAP_LANMANRESP], MS_CHAP_LANMANRESP_LEN);
220 diff = memcmp(&response[MS_CHAP_NTRESP], &md[MS_CHAP_NTRESP],
224 slprintf(message, message_space, "Access granted");
229 /* See comments below for MS-CHAP V2 */
230 slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0",
231 challenge_len, challenge);
236 chapms2_verify_response(int id, char *name,
237 unsigned char *secret, int secret_len,
238 unsigned char *challenge, unsigned char *response,
239 char *message, int message_space)
241 unsigned char md[MS_CHAP2_RESPONSE_LEN];
242 char saresponse[MS_AUTH_RESPONSE_LENGTH+1];
243 int challenge_len, response_len;
245 challenge_len = *challenge++; /* skip length, is 16 */
246 response_len = *response++;
247 if (response_len != MS_CHAP2_RESPONSE_LEN)
248 goto bad; /* not even the right length */
250 /* Generate the expected response and our mutual auth. */
251 ChapMS2(challenge, &response[MS_CHAP2_PEER_CHALLENGE], name,
252 (char *)secret, secret_len, md,
253 (unsigned char *)saresponse, MS_CHAP2_AUTHENTICATOR);
255 /* compare MDs and send the appropriate status */
257 * Per RFC 2759, success message must be formatted as
258 * "S=<auth_string> M=<message>"
260 * <auth_string> is the Authenticator Response (mutual auth)
261 * <message> is a text message
263 * However, some versions of Windows (win98 tested) do not know
264 * about the M=<message> part (required per RFC 2759) and flag
265 * it as an error (reported incorrectly as an encryption error
266 * to the user). Since the RFC requires it, and it can be
267 * useful information, we supply it if the peer is a conforming
268 * system. Luckily (?), win98 sets the Flags field to 0x04
269 * (contrary to RFC requirements) so we can use that to
270 * distinguish between conforming and non-conforming systems.
272 * Special thanks to Alex Swiridov <say@real.kharkov.ua> for
273 * help debugging this.
275 if (memcmp(&md[MS_CHAP2_NTRESP], &response[MS_CHAP2_NTRESP],
276 MS_CHAP2_NTRESP_LEN) == 0) {
277 if (response[MS_CHAP2_FLAGS])
278 slprintf(message, message_space, "S=%s", saresponse);
280 slprintf(message, message_space, "S=%s M=%s",
281 saresponse, "Access granted");
287 * Failure message must be formatted as
288 * "E=e R=r C=c V=v M=m"
290 * e = error code (we use 691, ERROR_AUTHENTICATION_FAILURE)
291 * r = retry (we use 1, ok to retry)
292 * c = challenge to use for next response, we reuse previous
293 * v = Change Password version supported, we use 0
296 * The M=m part is only for MS-CHAPv2. Neither win2k nor
297 * win98 (others untested) display the message to the user anyway.
298 * They also both ignore the E=e code.
300 * Note that it's safe to reuse the same challenge as we don't
301 * actually accept another response based on the error message
302 * (and no clients try to resend a response anyway).
304 * Basically, this whole bit is useless code, even the small
305 * implementation here is only because of overspecification.
307 slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0 M=%s",
308 challenge_len, challenge, "Access denied");
313 chapms_make_response(unsigned char *response, int id, char *our_name,
314 unsigned char *challenge, char *secret, int secret_len,
315 unsigned char *private)
317 challenge++; /* skip length, should be 8 */
318 *response++ = MS_CHAP_RESPONSE_LEN;
319 ChapMS(challenge, secret, secret_len, response);
322 struct chapms2_response_cache_entry {
324 unsigned char challenge[16];
325 unsigned char response[MS_CHAP2_RESPONSE_LEN];
326 unsigned char auth_response[MS_AUTH_RESPONSE_LENGTH];
329 #define CHAPMS2_MAX_RESPONSE_CACHE_SIZE 10
330 static struct chapms2_response_cache_entry
331 chapms2_response_cache[CHAPMS2_MAX_RESPONSE_CACHE_SIZE];
332 static int chapms2_response_cache_next_index = 0;
333 static int chapms2_response_cache_size = 0;
336 chapms2_add_to_response_cache(int id, unsigned char *challenge,
337 unsigned char *response,
338 unsigned char *auth_response)
340 int i = chapms2_response_cache_next_index;
342 chapms2_response_cache[i].id = id;
343 memcpy(chapms2_response_cache[i].challenge, challenge, 16);
344 memcpy(chapms2_response_cache[i].response, response,
345 MS_CHAP2_RESPONSE_LEN);
346 memcpy(chapms2_response_cache[i].auth_response,
347 auth_response, MS_AUTH_RESPONSE_LENGTH);
348 chapms2_response_cache_next_index =
349 (i + 1) % CHAPMS2_MAX_RESPONSE_CACHE_SIZE;
350 if (chapms2_response_cache_next_index > chapms2_response_cache_size)
351 chapms2_response_cache_size = chapms2_response_cache_next_index;
352 dbglog("added response cache entry %d", i);
355 static struct chapms2_response_cache_entry*
356 chapms2_find_in_response_cache(int id, unsigned char *challenge,
357 unsigned char *auth_response)
361 for (i = 0; i < chapms2_response_cache_size; i++) {
362 if (id == chapms2_response_cache[i].id
365 chapms2_response_cache[i].challenge,
368 || memcmp(auth_response,
369 chapms2_response_cache[i].auth_response,
370 MS_AUTH_RESPONSE_LENGTH) == 0)) {
371 dbglog("response found in cache (entry %d)", i);
372 return &chapms2_response_cache[i];
375 return NULL; /* not found */
379 chapms2_make_response(unsigned char *response, int id, char *our_name,
380 unsigned char *challenge, char *secret, int secret_len,
381 unsigned char *private)
383 const struct chapms2_response_cache_entry *cache_entry;
384 unsigned char auth_response[MS_AUTH_RESPONSE_LENGTH+1];
386 challenge++; /* skip length, should be 16 */
387 *response++ = MS_CHAP2_RESPONSE_LEN;
388 cache_entry = chapms2_find_in_response_cache(id, challenge, NULL);
390 memcpy(response, cache_entry->response, MS_CHAP2_RESPONSE_LEN);
395 mschap2_peer_challenge,
399 our_name, secret, secret_len, response, auth_response,
400 MS_CHAP2_AUTHENTICATEE);
401 chapms2_add_to_response_cache(id, challenge, response, auth_response);
405 chapms2_check_success(int id, unsigned char *msg, int len)
407 if ((len < MS_AUTH_RESPONSE_LENGTH + 2) ||
408 strncmp((char *)msg, "S=", 2) != 0) {
409 /* Packet does not start with "S=" */
410 error("MS-CHAPv2 Success packet is badly formed.");
415 if (len < MS_AUTH_RESPONSE_LENGTH
416 || !chapms2_find_in_response_cache(id, NULL /* challenge */, msg)) {
417 /* Authenticator Response did not match expected. */
418 error("MS-CHAPv2 mutual authentication failed.");
421 /* Authenticator Response matches. */
422 msg += MS_AUTH_RESPONSE_LENGTH; /* Eat it */
423 len -= MS_AUTH_RESPONSE_LENGTH;
424 if ((len >= 3) && !strncmp((char *)msg, " M=", 3)) {
425 msg += 3; /* Eat the delimiter */
426 } else if ((len >= 2) && !strncmp((char *)msg, "M=", 2)) {
427 msg += 2; /* Eat the delimiter */
429 /* Packet has extra text which does not begin " M=" */
430 error("MS-CHAPv2 Success packet is badly formed.");
437 chapms_handle_failure(unsigned char *inp, int len)
442 /* We want a null-terminated string for strxxx(). */
443 msg = malloc(len + 1);
445 notice("Out of memory in chapms_handle_failure");
448 BCOPY(inp, msg, len);
453 * Deal with MS-CHAP formatted failure messages; just print the
454 * M=<message> part (if any). For MS-CHAP we're not really supposed
455 * to use M=<message>, but it shouldn't hurt. See
456 * chapms[2]_verify_response.
458 if (!strncmp(p, "E=", 2))
459 err = strtol(p+2, NULL, 10); /* Remember the error code. */
461 goto print_msg; /* Message is badly formatted. */
463 if (len && ((p = strstr(p, " M=")) != NULL)) {
464 /* M=<message> field found. */
467 /* No M=<message>; use the error code. */
469 case MS_CHAP_ERROR_RESTRICTED_LOGON_HOURS:
470 p = "E=646 Restricted logon hours";
473 case MS_CHAP_ERROR_ACCT_DISABLED:
474 p = "E=647 Account disabled";
477 case MS_CHAP_ERROR_PASSWD_EXPIRED:
478 p = "E=648 Password expired";
481 case MS_CHAP_ERROR_NO_DIALIN_PERMISSION:
482 p = "E=649 No dialin permission";
485 case MS_CHAP_ERROR_AUTHENTICATION_FAILURE:
486 p = "E=691 Authentication failure";
489 case MS_CHAP_ERROR_CHANGING_PASSWORD:
490 /* Should never see this, we don't support Change Password. */
491 p = "E=709 Error changing password";
496 error("Unknown MS-CHAP authentication failure: %.*v",
503 error("MS-CHAP authentication failed: %v", p);
508 ChallengeResponse(u_char *challenge,
509 u_char *PasswordHash,
512 u_char ZPasswordHash[24];
515 BZERO(ZPasswordHash, sizeof(ZPasswordHash));
516 BCOPY(PasswordHash, ZPasswordHash, MD4_DIGEST_LENGTH);
519 dbglog("ChallengeResponse - ZPasswordHash %.*B",
520 sizeof(ZPasswordHash), ZPasswordHash);
523 if (DesEncrypt(challenge, ZPasswordHash + 0, response + 0) &&
524 DesEncrypt(challenge, ZPasswordHash + 7, response + 8) &&
525 DesEncrypt(challenge, ZPasswordHash + 14, response + 16))
529 dbglog("ChallengeResponse - response %.24B", response);
535 ChallengeHash(u_char PeerChallenge[16], u_char *rchallenge,
536 char *username, u_char Challenge[8])
540 u_char hash[SHA_DIGEST_LENGTH];
544 /* remove domain from "domain\username" */
545 if ((user = strrchr(username, '\\')) != NULL)
550 ctx = PPP_MD_CTX_new();
553 if (PPP_DigestInit(ctx, PPP_sha1())) {
555 if (PPP_DigestUpdate(ctx, PeerChallenge, 16)) {
557 if (PPP_DigestUpdate(ctx, rchallenge, 16)) {
559 if (PPP_DigestUpdate(ctx, user, strlen(user))) {
561 hash_len = SHA_DIGEST_LENGTH;
562 if (PPP_DigestFinal(ctx, hash, &hash_len)) {
564 BCOPY(hash, Challenge, 8);
571 PPP_MD_CTX_free(ctx);
576 * Convert the ASCII version of the password to Unicode.
577 * This implicitly supports 8-bit ISO8859/1 characters.
578 * This gives us the little-endian representation, which
579 * is assumed by all M$ CHAP RFCs. (Unicode byte ordering
580 * is machine-dependent.)
583 ascii2unicode(char ascii[], int ascii_len, u_char unicode[])
587 BZERO(unicode, ascii_len * 2);
588 for (i = 0; i < ascii_len; i++)
589 unicode[i * 2] = (u_char) ascii[i];
593 NTPasswordHash(u_char *secret, int secret_len, unsigned char* hash)
595 PPP_MD_CTX* ctx = PPP_MD_CTX_new();
598 if (PPP_DigestInit(ctx, PPP_md4())) {
600 if (PPP_DigestUpdate(ctx, secret, secret_len)) {
602 int hash_len = MD4_DIGEST_LENGTH;
603 PPP_DigestFinal(ctx, hash, &hash_len);
607 PPP_MD_CTX_free(ctx);
612 ChapMS_NT(u_char *rchallenge, char *secret, int secret_len,
613 u_char NTResponse[24])
615 u_char unicodePassword[MAX_NT_PASSWORD * 2];
616 u_char PasswordHash[MD4_DIGEST_LENGTH];
618 /* Hash the Unicode version of the secret (== password). */
619 ascii2unicode(secret, secret_len, unicodePassword);
620 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
622 ChallengeResponse(rchallenge, PasswordHash, NTResponse);
626 ChapMS2_NT(u_char *rchallenge, u_char PeerChallenge[16], char *username,
627 char *secret, int secret_len, u_char NTResponse[24])
629 u_char unicodePassword[MAX_NT_PASSWORD * 2];
630 u_char PasswordHash[MD4_DIGEST_LENGTH];
633 ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
635 /* Hash the Unicode version of the secret (== password). */
636 ascii2unicode(secret, secret_len, unicodePassword);
637 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
639 ChallengeResponse(Challenge, PasswordHash, NTResponse);
642 #ifdef PPP_WITH_MSLANMAN
643 static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
646 ChapMS_LANMan(u_char *rchallenge, char *secret, int secret_len,
647 unsigned char *response)
650 u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
651 u_char PasswordHash[MD4_DIGEST_LENGTH];
653 /* LANMan password is case insensitive */
654 BZERO(UcasePassword, sizeof(UcasePassword));
655 for (i = 0; i < secret_len; i++)
656 UcasePassword[i] = (u_char)toupper(secret[i]);
658 if (DesEncrypt(StdText, UcasePassword + 0, PasswordHash + 0) &&
659 DesEncrypt(StdText, UcasePassword + 7, PasswordHash + 8)) {
661 ChallengeResponse(rchallenge, PasswordHash, &response[MS_CHAP_LANMANRESP]);
668 GenerateAuthenticatorResponse(unsigned char* PasswordHashHash,
669 unsigned char *NTResponse, unsigned char *PeerChallenge,
670 unsigned char *rchallenge, char *username,
671 unsigned char *authResponse)
674 * "Magic" constants used in response generation, from RFC 2759.
676 u_char Magic1[39] = /* "Magic server to client signing constant" */
677 { 0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
678 0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
679 0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
680 0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74 };
681 u_char Magic2[41] = /* "Pad to make it do more than one iteration" */
682 { 0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
683 0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
684 0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
685 0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
690 u_char Digest[SHA_DIGEST_LENGTH] = {};
694 ctx = PPP_MD_CTX_new();
697 if (PPP_DigestInit(ctx, PPP_sha1())) {
699 if (PPP_DigestUpdate(ctx, PasswordHashHash, MD4_DIGEST_LENGTH)) {
701 if (PPP_DigestUpdate(ctx, NTResponse, 24)) {
703 if (PPP_DigestUpdate(ctx, Magic1, sizeof(Magic1))) {
705 hash_len = sizeof(Digest);
706 PPP_DigestFinal(ctx, Digest, &hash_len);
711 PPP_MD_CTX_free(ctx);
714 ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
716 ctx = PPP_MD_CTX_new();
719 if (PPP_DigestInit(ctx, PPP_sha1())) {
721 if (PPP_DigestUpdate(ctx, Digest, sizeof(Digest))) {
723 if (PPP_DigestUpdate(ctx, Challenge, sizeof(Challenge))) {
725 if (PPP_DigestUpdate(ctx, Magic2, sizeof(Magic2))) {
727 hash_len = sizeof(Digest);
728 PPP_DigestFinal(ctx, Digest, &hash_len);
734 PPP_MD_CTX_free(ctx);
737 /* Convert to ASCII hex string. */
738 for (i = 0; i < MAX((MS_AUTH_RESPONSE_LENGTH / 2), sizeof(Digest)); i++) {
739 sprintf((char *)&authResponse[i * 2], "%02X", Digest[i]);
745 GenerateAuthenticatorResponsePlain
746 (char *secret, int secret_len,
747 u_char NTResponse[24], u_char PeerChallenge[16],
748 u_char *rchallenge, char *username,
749 u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1])
751 u_char unicodePassword[MAX_NT_PASSWORD * 2];
752 u_char PasswordHash[MD4_DIGEST_LENGTH];
753 u_char PasswordHashHash[MD4_DIGEST_LENGTH];
755 /* Hash (x2) the Unicode version of the secret (== password). */
756 ascii2unicode(secret, secret_len, unicodePassword);
757 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
758 NTPasswordHash(PasswordHash, sizeof(PasswordHash),
761 GenerateAuthenticatorResponse(PasswordHashHash, NTResponse, PeerChallenge,
762 rchallenge, username, authResponse);
769 * Set mppe_xxxx_key from MS-CHAP credentials. (see RFC 3079)
772 Set_Start_Key(u_char *rchallenge, char *secret, int secret_len)
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), PasswordHashHash);
783 mppe_set_chapv1(rchallenge, PasswordHashHash);
787 * Set mppe_xxxx_key from MS-CHAPv2 credentials. (see RFC 3079)
790 SetMasterKeys(char *secret, int secret_len, u_char NTResponse[24], int IsServer)
792 u_char unicodePassword[MAX_NT_PASSWORD * 2];
793 u_char PasswordHash[MD4_DIGEST_LENGTH];
794 u_char PasswordHashHash[MD4_DIGEST_LENGTH];
795 /* Hash (x2) the Unicode version of the secret (== password). */
796 ascii2unicode(secret, secret_len, unicodePassword);
797 NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
798 NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
799 mppe_set_chapv2(PasswordHashHash, NTResponse, IsServer);
802 #endif /* PPP_WITH_MPPE */
806 ChapMS(u_char *rchallenge, char *secret, int secret_len,
807 unsigned char *response)
809 BZERO(response, MS_CHAP_RESPONSE_LEN);
811 ChapMS_NT(rchallenge, secret, secret_len, &response[MS_CHAP_NTRESP]);
813 #ifdef PPP_WITH_MSLANMAN
814 ChapMS_LANMan(rchallenge, secret, secret_len,
815 &response[MS_CHAP_LANMANRESP]);
817 /* preferred method is set by option */
818 response[MS_CHAP_USENT] = !ms_lanman;
820 response[MS_CHAP_USENT] = 1;
824 Set_Start_Key(rchallenge, secret, secret_len);
830 * If PeerChallenge is NULL, one is generated and the PeerChallenge
831 * field of response is filled in. Call this way when generating a response.
832 * If PeerChallenge is supplied, it is copied into the PeerChallenge field.
833 * Call this way when verifying a response (or debugging).
834 * Do not call with PeerChallenge = response.
836 * The PeerChallenge field of response is then used for calculation of the
837 * Authenticator Response.
840 ChapMS2(unsigned char *rchallenge, unsigned char *PeerChallenge,
841 char *user, char *secret, int secret_len, unsigned char *response,
842 u_char authResponse[], int authenticator)
845 u_char *p = &response[MS_CHAP2_PEER_CHALLENGE];
848 BZERO(response, MS_CHAP2_RESPONSE_LEN);
850 /* Generate the Peer-Challenge if requested, or copy it if supplied. */
852 for (i = 0; i < MS_CHAP2_PEER_CHAL_LEN; i++)
853 *p++ = (u_char) (drand48() * 0xff);
855 BCOPY(PeerChallenge, &response[MS_CHAP2_PEER_CHALLENGE],
856 MS_CHAP2_PEER_CHAL_LEN);
858 /* Generate the NT-Response */
859 ChapMS2_NT(rchallenge, &response[MS_CHAP2_PEER_CHALLENGE], user,
860 secret, secret_len, &response[MS_CHAP2_NTRESP]);
862 /* Generate the Authenticator Response. */
863 GenerateAuthenticatorResponsePlain(secret, secret_len,
864 &response[MS_CHAP2_NTRESP],
865 &response[MS_CHAP2_PEER_CHALLENGE],
866 rchallenge, user, authResponse);
869 SetMasterKeys(secret, secret_len,
870 &response[MS_CHAP2_NTRESP], authenticator);
875 static struct chap_digest_type chapms_digest = {
876 CHAP_MICROSOFT, /* code */
877 chapms_generate_challenge,
878 chapms_verify_response,
879 chapms_make_response,
880 NULL, /* check_success */
881 chapms_handle_failure,
884 static struct chap_digest_type chapms2_digest = {
885 CHAP_MICROSOFT_V2, /* code */
886 chapms2_generate_challenge,
887 chapms2_verify_response,
888 chapms2_make_response,
889 chapms2_check_success,
890 chapms_handle_failure,
897 chap_register_digest(&chapms_digest);
898 chap_register_digest(&chapms2_digest);
899 ppp_add_options(chapms_option_list);
909 void random_bytes(unsigned char *bytes, int len)
914 bytes[i++] = (unsigned char) rand();
919 int test_chap_v1(void) {
920 char *secret = "MyPw";
922 unsigned char challenge[8] = {
923 0x10, 0x2D, 0xB5, 0xDF, 0x08, 0x5D, 0x30, 0x41
925 unsigned char response[MS_CHAP_RESPONSE_LEN] = {
927 unsigned char result[MS_CHAP_RESPONSE_LEN] = {
928 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
929 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
930 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
932 0x4E, 0x9D, 0x3C, 0x8F, 0x9C, 0xFD, 0x38, 0x5D,
933 0x5B, 0xF4, 0xD3, 0x24, 0x67, 0x91, 0x95, 0x6C,
934 0xA4, 0xC3, 0x51, 0xAB, 0x40, 0x9A, 0x3D, 0x61,
939 ChapMS(challenge, secret, strlen(secret), response);
940 return memcmp(response, result, MS_CHAP_RESPONSE_LEN);
943 int test_chap_v2(void) {
944 char *secret = "clientPass";
947 char saresponse[MS_AUTH_RESPONSE_LENGTH+1];
948 char *saresult = "407A5589115FD0D6209F510FE9C04566932CDA56";
950 unsigned char authenticator[16] = {
951 0x5B, 0x5D, 0x7C, 0x7D, 0x7B, 0x3F, 0x2F, 0x3E,
952 0x3C, 0x2C, 0x60, 0x21, 0x32, 0x26, 0x26, 0x28
954 unsigned char peerchallenge[16] = {
955 0x21, 0x40, 0x23, 0x24, 0x25, 0x5E, 0x26, 0x2A,
956 0x28, 0x29, 0x5F, 0x2B, 0x3A, 0x33, 0x7C, 0x7E
958 unsigned char result[MS_CHAP_NTRESP_LEN] = {
959 0x82, 0x30, 0x9E, 0xCD, 0x8D, 0x70, 0x8B, 0x5E,
960 0xA0, 0x8F, 0xAA, 0x39, 0x81, 0xCD, 0x83, 0x54,
961 0x42, 0x33, 0x11, 0x4A, 0x3D, 0x85, 0xD6, 0xDF
964 unsigned char response[MS_CHAP2_RESPONSE_LEN] = {
967 ChapMS2(authenticator, peerchallenge, name,
968 secret, strlen(secret), response,
969 (unsigned char *)saresponse, MS_CHAP2_AUTHENTICATOR);
971 return memcmp(&response[MS_CHAP2_NTRESP], result, MS_CHAP2_NTRESP_LEN) ||
972 strncmp(saresponse, saresult, MS_AUTH_RESPONSE_LENGTH);
975 int main(int argc, char *argv[]) {
979 if (test_chap_v1()) {
980 printf("CHAPv1 failed\n");
984 if (test_chap_v2()) {
985 printf("CHAPv2 failed\n");
995 #endif /* UNIT_TEST */