/*
* chap_ms.c - Microsoft MS-CHAP compatible implementation.
*
- * Copyright (c) 1995 Eric Rosenquist, Strata Software Limited.
- * http://www.strataware.com/
+ * Copyright (c) 1995 Eric Rosenquist. All rights reserved.
*
- * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
*
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by Eric Rosenquist. The name of the author may not be used to
- * endorse or promote products derived from this software without
- * specific prior written permission.
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
*
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. The name(s) of the authors of this software must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission.
+ *
+ * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
*/
-#ifndef lint
-static char rcsid[] = "$Id: chap_ms.c,v 1.8 1998/04/01 00:15:43 paulus Exp $";
-#endif
+/*
+ * Modifications by Frank Cusack, frank@google.com, March 2002.
+ *
+ * Implemented MS-CHAPv2 functionality, heavily based on sample
+ * implementation in RFC 2759. Implemented MPPE functionality,
+ * heavily based on sample implementation in RFC 3079.
+ *
+ * Copyright (c) 2002 Google, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. The name(s) of the authors of this software must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission.
+ *
+ * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#define RCSID "$Id: chap_ms.c,v 1.28 2003/01/10 07:12:36 fcusack Exp $"
#ifdef CHAPMS
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/time.h>
-#include <syslog.h>
#include <unistd.h>
-#ifdef HAVE_CRYPT_H
-#include <crypt.h>
-#endif
#include "pppd.h"
#include "chap.h"
#include "chap_ms.h"
#include "md4.h"
-
-#ifndef USE_CRYPT
-#include <des.h>
+#include "sha1.h"
+#include "pppcrypt.h"
+
+static const char rcsid[] = RCSID;
+
+
+static void ChallengeHash __P((u_char[16], u_char *, char *, u_char[8]));
+static void ascii2unicode __P((char[], int, u_char[]));
+static void NTPasswordHash __P((char *, int, u_char[MD4_SIGNATURE_SIZE]));
+static void ChallengeResponse __P((u_char *, u_char *, u_char[24]));
+static void ChapMS_NT __P((u_char *, char *, int, u_char[24]));
+static void ChapMS2_NT __P((char *, u_char[16], char *, char *, int,
+ u_char[24]));
+static void GenerateAuthenticatorResponse __P((char*, int, u_char[24],
+ u_char[16], u_char *,
+ char *, u_char[41]));
+#ifdef MSLANMAN
+static void ChapMS_LANMan __P((u_char *, char *, int, MS_ChapResponse *));
#endif
-typedef struct {
- u_char LANManResp[24];
- u_char NTResp[24];
- u_char UseNT; /* If 1, ignore the LANMan response field */
-} MS_ChapResponse;
-/* We use MS_CHAP_RESPONSE_LEN, rather than sizeof(MS_ChapResponse),
- in case this struct gets padded. */
+#ifdef MPPE
+static void Set_Start_Key __P((u_char *, char *, int));
+static void SetMasterKeys __P((char *, int, u_char[24], int));
+#endif
+extern double drand48 __P((void));
-static void ChallengeResponse __P((u_char *, u_char *, u_char *));
-static void DesEncrypt __P((u_char *, u_char *, u_char *));
-static void MakeKey __P((u_char *, u_char *));
-static u_char Get7Bits __P((u_char *, int));
-static void ChapMS_NT __P((char *, int, char *, int, MS_ChapResponse *));
#ifdef MSLANMAN
-static void ChapMS_LANMan __P((char *, int, char *, int, MS_ChapResponse *));
+bool ms_lanman = 0; /* Use LanMan password instead of NT */
+ /* Has meaning only with MS-CHAP challenges */
#endif
-#ifdef USE_CRYPT
-static void Expand __P((u_char *, u_char *));
-static void Collapse __P((u_char *, u_char *));
+#ifdef MPPE
+u_char mppe_send_key[MPPE_MAX_KEY_LEN];
+u_char mppe_recv_key[MPPE_MAX_KEY_LEN];
+int mppe_keys_set = 0; /* Have the MPPE keys been set? */
+
+#include "fsm.h" /* Need to poke MPPE options */
+#include "ccp.h"
+#include <net/ppp-comp.h>
#endif
static void
-ChallengeResponse(challenge, pwHash, response)
- u_char *challenge; /* IN 8 octets */
- u_char *pwHash; /* IN 16 octets */
- u_char *response; /* OUT 24 octets */
+ChallengeResponse(u_char *challenge,
+ u_char PasswordHash[MD4_SIGNATURE_SIZE],
+ u_char response[24])
{
- char ZPasswordHash[21];
+ u_char ZPasswordHash[21];
BZERO(ZPasswordHash, sizeof(ZPasswordHash));
- BCOPY(pwHash, ZPasswordHash, MD4_SIGNATURE_SIZE);
+ BCOPY(PasswordHash, ZPasswordHash, MD4_SIGNATURE_SIZE);
#if 0
- log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash", LOG_DEBUG);
+ dbglog("ChallengeResponse - ZPasswordHash %.*B",
+ sizeof(ZPasswordHash), ZPasswordHash);
#endif
- DesEncrypt(challenge, ZPasswordHash + 0, response + 0);
- DesEncrypt(challenge, ZPasswordHash + 7, response + 8);
- DesEncrypt(challenge, ZPasswordHash + 14, response + 16);
+ (void) DesSetkey(ZPasswordHash + 0);
+ DesEncrypt(challenge, response + 0);
+ (void) DesSetkey(ZPasswordHash + 7);
+ DesEncrypt(challenge, response + 8);
+ (void) DesSetkey(ZPasswordHash + 14);
+ DesEncrypt(challenge, response + 16);
#if 0
- log_packet(response, 24, "ChallengeResponse - response", LOG_DEBUG);
+ dbglog("ChallengeResponse - response %.24B", response);
#endif
}
-
-#ifdef USE_CRYPT
static void
-DesEncrypt(clear, key, cipher)
- u_char *clear; /* IN 8 octets */
- u_char *key; /* IN 7 octets */
- u_char *cipher; /* OUT 8 octets */
+ChallengeHash(u_char PeerChallenge[16], u_char *rchallenge,
+ char *username, u_char Challenge[8])
+
{
- u_char des_key[8];
- u_char crypt_key[66];
- u_char des_input[66];
-
- MakeKey(key, des_key);
-
- Expand(des_key, crypt_key);
- setkey(crypt_key);
-
-#if 0
- CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X",
- clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
-#endif
-
- Expand(clear, des_input);
- encrypt(des_input, 0);
- Collapse(des_input, cipher);
-
-#if 0
- CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X",
- cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
-#endif
+ SHA1_CTX sha1Context;
+ u_char sha1Hash[SHA1_SIGNATURE_SIZE];
+ char *user;
+
+ /* remove domain from "domain\username" */
+ if ((user = strrchr(username, '\\')) != NULL)
+ ++user;
+ else
+ user = username;
+
+ SHA1_Init(&sha1Context);
+ SHA1_Update(&sha1Context, PeerChallenge, 16);
+ SHA1_Update(&sha1Context, rchallenge, 16);
+ SHA1_Update(&sha1Context, user, strlen(user));
+ SHA1_Final(sha1Hash, &sha1Context);
+
+ BCOPY(sha1Hash, Challenge, 8);
}
-#else /* USE_CRYPT */
-
+/*
+ * Convert the ASCII version of the password to Unicode.
+ * This implicitly supports 8-bit ISO8859/1 characters.
+ * This gives us the little-endian representation, which
+ * is assumed by all M$ CHAP RFCs. (Unicode byte ordering
+ * is machine-dependent.)
+ */
static void
-DesEncrypt(clear, key, cipher)
- u_char *clear; /* IN 8 octets */
- u_char *key; /* IN 7 octets */
- u_char *cipher; /* OUT 8 octets */
+ascii2unicode(char ascii[], int ascii_len, u_char unicode[])
{
- des_cblock des_key;
- des_key_schedule key_schedule;
-
- MakeKey(key, des_key);
-
- des_set_key(&des_key, key_schedule);
-
-#if 0
- CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %02X%02X%02X%02X%02X%02X%02X%02X",
- clear[0], clear[1], clear[2], clear[3], clear[4], clear[5], clear[6], clear[7]));
-#endif
+ int i;
- des_ecb_encrypt((des_cblock *)clear, (des_cblock *)cipher, key_schedule, 1);
-
-#if 0
- CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %02X%02X%02X%02X%02X%02X%02X%02X",
- cipher[0], cipher[1], cipher[2], cipher[3], cipher[4], cipher[5], cipher[6], cipher[7]));
-#endif
+ BZERO(unicode, ascii_len * 2);
+ for (i = 0; i < ascii_len; i++)
+ unicode[i * 2] = (u_char) ascii[i];
}
-#endif /* USE_CRYPT */
-
-
-static u_char Get7Bits(input, startBit)
- u_char *input;
- int startBit;
+static void
+NTPasswordHash(char *secret, int secret_len, u_char hash[MD4_SIGNATURE_SIZE])
{
- register unsigned int word;
-
- word = (unsigned)input[startBit / 8] << 8;
- word |= (unsigned)input[startBit / 8 + 1];
-
- word >>= 15 - (startBit % 8 + 7);
-
- return word & 0xFE;
-}
+#ifdef __NetBSD__
+ /* NetBSD uses the libc md4 routines which take bytes instead of bits */
+ int mdlen = secret_len;
+#else
+ int mdlen = secret_len * 8;
+#endif
+ MD4_CTX md4Context;
-#ifdef USE_CRYPT
+ MD4Init(&md4Context);
+ MD4Update(&md4Context, secret, mdlen);
+ MD4Final(hash, &md4Context);
-/* in == 8-byte string (expanded version of the 56-bit key)
- * out == 64-byte string where each byte is either 1 or 0
- * Note that the low-order "bit" is always ignored by by setkey()
- */
-static void Expand(in, out)
- u_char *in;
- u_char *out;
-{
- int j, c;
- int i;
-
- for(i = 0; i < 64; in++){
- c = *in;
- for(j = 7; j >= 0; j--)
- *out++ = (c >> j) & 01;
- i += 8;
- }
}
-/* The inverse of Expand
- */
-static void Collapse(in, out)
- u_char *in;
- u_char *out;
+static void
+ChapMS_NT(u_char *rchallenge, char *secret, int secret_len,
+ u_char NTResponse[24])
{
- int j;
- int i;
- unsigned int c;
-
- for (i = 0; i < 64; i += 8, out++) {
- c = 0;
- for (j = 7; j >= 0; j--, in++)
- c |= *in << j;
- *out = c & 0xff;
- }
-}
-#endif
+ u_char unicodePassword[MAX_NT_PASSWORD * 2];
+ u_char PasswordHash[MD4_SIGNATURE_SIZE];
-static void MakeKey(key, des_key)
- u_char *key; /* IN 56 bit DES key missing parity bits */
- u_char *des_key; /* OUT 64 bit DES key with parity bits added */
-{
- des_key[0] = Get7Bits(key, 0);
- des_key[1] = Get7Bits(key, 7);
- des_key[2] = Get7Bits(key, 14);
- des_key[3] = Get7Bits(key, 21);
- des_key[4] = Get7Bits(key, 28);
- des_key[5] = Get7Bits(key, 35);
- des_key[6] = Get7Bits(key, 42);
- des_key[7] = Get7Bits(key, 49);
-
-#ifndef USE_CRYPT
- des_set_odd_parity((des_cblock *)des_key);
-#endif
+ /* Hash the Unicode version of the secret (== password). */
+ ascii2unicode(secret, secret_len, unicodePassword);
+ NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
-#if 0
- CHAPDEBUG((LOG_INFO, "MakeKey: 56-bit input : %02X%02X%02X%02X%02X%02X%02X",
- key[0], key[1], key[2], key[3], key[4], key[5], key[6]));
- CHAPDEBUG((LOG_INFO, "MakeKey: 64-bit output: %02X%02X%02X%02X%02X%02X%02X%02X",
- des_key[0], des_key[1], des_key[2], des_key[3], des_key[4], des_key[5], des_key[6], des_key[7]));
-#endif
+ ChallengeResponse(rchallenge, PasswordHash, NTResponse);
}
static void
-ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, response)
- char *rchallenge;
- int rchallenge_len;
- char *secret;
- int secret_len;
- MS_ChapResponse *response;
+ChapMS2_NT(char *rchallenge, u_char PeerChallenge[16], char *username,
+ char *secret, int secret_len, u_char NTResponse[24])
{
- int i;
- MD4_CTX md4Context;
- u_char hash[MD4_SIGNATURE_SIZE];
- u_char unicodePassword[MAX_NT_PASSWORD * 2];
+ u_char unicodePassword[MAX_NT_PASSWORD * 2];
+ u_char PasswordHash[MD4_SIGNATURE_SIZE];
+ u_char Challenge[8];
- /* Initialize the Unicode version of the secret (== password). */
- /* This implicitly supports 8-bit ISO8859/1 characters. */
- BZERO(unicodePassword, sizeof(unicodePassword));
- for (i = 0; i < secret_len; i++)
- unicodePassword[i * 2] = (u_char)secret[i];
-
- MD4Init(&md4Context);
- MD4Update(&md4Context, unicodePassword, secret_len * 2 * 8); /* Unicode is 2 bytes/char, *8 for bit count */
+ ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
- MD4Final(hash, &md4Context); /* Tell MD4 we're done */
+ /* Hash the Unicode version of the secret (== password). */
+ ascii2unicode(secret, secret_len, unicodePassword);
+ NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
- ChallengeResponse(rchallenge, hash, response->NTResp);
+ ChallengeResponse(Challenge, PasswordHash, NTResponse);
}
#ifdef MSLANMAN
static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
static void
-ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, response)
- char *rchallenge;
- int rchallenge_len;
- char *secret;
- int secret_len;
- MS_ChapResponse *response;
+ChapMS_LANMan(u_char *rchallenge, char *secret, int secret_len,
+ MS_ChapResponse *response)
{
int i;
u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
BZERO(UcasePassword, sizeof(UcasePassword));
for (i = 0; i < secret_len; i++)
UcasePassword[i] = (u_char)toupper(secret[i]);
- DesEncrypt( StdText, UcasePassword + 0, PasswordHash + 0 );
- DesEncrypt( StdText, UcasePassword + 7, PasswordHash + 8 );
+ (void) DesSetkey(UcasePassword + 0);
+ DesEncrypt( StdText, PasswordHash + 0 );
+ (void) DesSetkey(UcasePassword + 7);
+ DesEncrypt( StdText, PasswordHash + 8 );
ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
}
#endif
+
+static void
+GenerateAuthenticatorResponse(char *secret, int secret_len,
+ u_char NTResponse[24], u_char PeerChallenge[16],
+ u_char *rchallenge, char *username,
+ u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1])
+{
+ /*
+ * "Magic" constants used in response generation, from RFC 2759.
+ */
+ u_char Magic1[39] = /* "Magic server to client signing constant" */
+ { 0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
+ 0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
+ 0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
+ 0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74 };
+ u_char Magic2[41] = /* "Pad to make it do more than one iteration" */
+ { 0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
+ 0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
+ 0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
+ 0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
+ 0x6E };
+
+ int i;
+ SHA1_CTX sha1Context;
+ u_char unicodePassword[MAX_NT_PASSWORD * 2];
+ u_char PasswordHash[MD4_SIGNATURE_SIZE];
+ u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
+ u_char Digest[SHA1_SIGNATURE_SIZE];
+ u_char Challenge[8];
+
+ /* Hash (x2) the Unicode version of the secret (== password). */
+ ascii2unicode(secret, secret_len, unicodePassword);
+ NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
+ NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
+
+ SHA1_Init(&sha1Context);
+ SHA1_Update(&sha1Context, PasswordHashHash, sizeof(PasswordHashHash));
+ SHA1_Update(&sha1Context, NTResponse, 24);
+ SHA1_Update(&sha1Context, Magic1, sizeof(Magic1));
+ SHA1_Final(Digest, &sha1Context);
+
+ ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
+
+ SHA1_Init(&sha1Context);
+ SHA1_Update(&sha1Context, Digest, sizeof(Digest));
+ SHA1_Update(&sha1Context, Challenge, sizeof(Challenge));
+ SHA1_Update(&sha1Context, Magic2, sizeof(Magic2));
+ SHA1_Final(Digest, &sha1Context);
+
+ /* Convert to ASCII hex string. */
+ for (i = 0; i < MAX((MS_AUTH_RESPONSE_LENGTH / 2), sizeof(Digest)); i++)
+ sprintf(&authResponse[i * 2], "%02X", Digest[i]);
+}
+
+
+#ifdef MPPE
+/*
+ * Set mppe_xxxx_key from the NTPasswordHashHash.
+ * RFC 2548 (RADIUS support) requires us to export this function (ugh).
+ */
void
-ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len)
- chap_state *cstate;
- char *rchallenge;
- int rchallenge_len;
- char *secret;
- int secret_len;
+mppe_set_keys(u_char *rchallenge, u_char PasswordHashHash[MD4_SIGNATURE_SIZE])
{
- MS_ChapResponse response;
-#ifdef MSLANMAN
- extern int ms_lanman;
-#endif
+ SHA1_CTX sha1Context;
+ u_char Digest[SHA1_SIGNATURE_SIZE]; /* >= MPPE_MAX_KEY_LEN */
+
+ SHA1_Init(&sha1Context);
+ SHA1_Update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
+ SHA1_Update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
+ SHA1_Update(&sha1Context, rchallenge, 8);
+ SHA1_Final(Digest, &sha1Context);
+
+ /* Same key in both directions. */
+ BCOPY(Digest, mppe_send_key, sizeof(mppe_send_key));
+ BCOPY(Digest, mppe_recv_key, sizeof(mppe_recv_key));
+}
+
+/*
+ * Set mppe_xxxx_key from MS-CHAP credentials. (see RFC 3079)
+ */
+static void
+Set_Start_Key(u_char *rchallenge, char *secret, int secret_len)
+{
+ u_char unicodePassword[MAX_NT_PASSWORD * 2];
+ u_char PasswordHash[MD4_SIGNATURE_SIZE];
+ u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
+
+ /* Hash (x2) the Unicode version of the secret (== password). */
+ ascii2unicode(secret, secret_len, unicodePassword);
+ NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
+ NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
+
+ mppe_set_keys(rchallenge, PasswordHashHash);
+}
+
+/*
+ * Set mppe_xxxx_key from MS-CHAPv2 credentials. (see RFC 3079)
+ */
+static void
+SetMasterKeys(char *secret, int secret_len, u_char NTResponse[24], int IsServer)
+{
+ SHA1_CTX sha1Context;
+ u_char unicodePassword[MAX_NT_PASSWORD * 2];
+ u_char PasswordHash[MD4_SIGNATURE_SIZE];
+ u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
+ u_char MasterKey[SHA1_SIGNATURE_SIZE]; /* >= MPPE_MAX_KEY_LEN */
+ u_char Digest[SHA1_SIGNATURE_SIZE]; /* >= MPPE_MAX_KEY_LEN */
+
+ u_char SHApad1[40] =
+ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+ u_char SHApad2[40] =
+ { 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
+ 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
+ 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
+ 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2 };
+
+ /* "This is the MPPE Master Key" */
+ u_char Magic1[27] =
+ { 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74,
+ 0x68, 0x65, 0x20, 0x4d, 0x50, 0x50, 0x45, 0x20, 0x4d,
+ 0x61, 0x73, 0x74, 0x65, 0x72, 0x20, 0x4b, 0x65, 0x79 };
+ /* "On the client side, this is the send key; "
+ "on the server side, it is the receive key." */
+ u_char Magic2[84] =
+ { 0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
+ 0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
+ 0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
+ 0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20, 0x6b, 0x65, 0x79,
+ 0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x73,
+ 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73, 0x69, 0x64, 0x65,
+ 0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
+ 0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
+ 0x6b, 0x65, 0x79, 0x2e };
+ /* "On the client side, this is the receive key; "
+ "on the server side, it is the send key." */
+ u_char Magic3[84] =
+ { 0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
+ 0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
+ 0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
+ 0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
+ 0x6b, 0x65, 0x79, 0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68,
+ 0x65, 0x20, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73,
+ 0x69, 0x64, 0x65, 0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73,
+ 0x20, 0x74, 0x68, 0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20,
+ 0x6b, 0x65, 0x79, 0x2e };
+ u_char *s;
+
+ /* Hash (x2) the Unicode version of the secret (== password). */
+ ascii2unicode(secret, secret_len, unicodePassword);
+ NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
+ NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
+
+ SHA1_Init(&sha1Context);
+ SHA1_Update(&sha1Context, PasswordHashHash, sizeof(PasswordHashHash));
+ SHA1_Update(&sha1Context, NTResponse, 24);
+ SHA1_Update(&sha1Context, Magic1, sizeof(Magic1));
+ SHA1_Final(MasterKey, &sha1Context);
+
+ /*
+ * generate send key
+ */
+ if (IsServer)
+ s = Magic3;
+ else
+ s = Magic2;
+ SHA1_Init(&sha1Context);
+ SHA1_Update(&sha1Context, MasterKey, 16);
+ SHA1_Update(&sha1Context, SHApad1, sizeof(SHApad1));
+ SHA1_Update(&sha1Context, s, 84);
+ SHA1_Update(&sha1Context, SHApad2, sizeof(SHApad2));
+ SHA1_Final(Digest, &sha1Context);
+
+ BCOPY(Digest, mppe_send_key, sizeof(mppe_send_key));
+
+ /*
+ * generate recv key
+ */
+ if (IsServer)
+ s = Magic2;
+ else
+ s = Magic3;
+ SHA1_Init(&sha1Context);
+ SHA1_Update(&sha1Context, MasterKey, 16);
+ SHA1_Update(&sha1Context, SHApad1, sizeof(SHApad1));
+ SHA1_Update(&sha1Context, s, 84);
+ SHA1_Update(&sha1Context, SHApad2, sizeof(SHApad2));
+ SHA1_Final(Digest, &sha1Context);
+
+ BCOPY(Digest, mppe_recv_key, sizeof(mppe_recv_key));
+}
+#endif /* MPPE */
+
+
+void
+ChapMS(chap_state *cstate, u_char *rchallenge, char *secret, int secret_len,
+ MS_ChapResponse *response)
+{
#if 0
CHAPDEBUG((LOG_INFO, "ChapMS: secret is '%.*s'", secret_len, secret));
#endif
- BZERO(&response, sizeof(response));
+ BZERO(response, sizeof(*response));
- /* Calculate both always */
- ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);
+ ChapMS_NT(rchallenge, secret, secret_len, response->NTResp);
#ifdef MSLANMAN
- ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);
+ ChapMS_LANMan(rchallenge, secret, secret_len, response);
- /* prefered method is set by option */
- response.UseNT = !ms_lanman;
+ /* preferred method is set by option */
+ response->UseNT[0] = !ms_lanman;
#else
- response.UseNT = 1;
+ response->UseNT[0] = 1;
#endif
- BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
cstate->resp_length = MS_CHAP_RESPONSE_LEN;
+
+#ifdef MPPE
+ Set_Start_Key(rchallenge, secret, secret_len);
+ mppe_keys_set = 1;
+#endif
+}
+
+
+/*
+ * If PeerChallenge is NULL, one is generated and response->PeerChallenge
+ * is filled in. Call this way when generating a response.
+ * If PeerChallenge is supplied, it is copied into response->PeerChallenge.
+ * Call this way when verifying a response (or debugging).
+ * Do not call with PeerChallenge = response->PeerChallenge.
+ *
+ * response->PeerChallenge is then used for calculation of the
+ * Authenticator Response.
+ */
+void
+ChapMS2(chap_state *cstate, u_char *rchallenge, u_char *PeerChallenge,
+ char *user, char *secret, int secret_len, MS_Chap2Response *response,
+ u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1], int authenticator)
+{
+ /* ARGSUSED */
+ u_char *p = response->PeerChallenge;
+ int i;
+
+ BZERO(response, sizeof(*response));
+
+ /* Generate the Peer-Challenge if requested, or copy it if supplied. */
+ if (!PeerChallenge)
+ for (i = 0; i < sizeof(response->PeerChallenge); i++)
+ *p++ = (u_char) (drand48() * 0xff);
+ else
+ BCOPY(PeerChallenge, response->PeerChallenge,
+ sizeof(response->PeerChallenge));
+
+ /* Generate the NT-Response */
+ ChapMS2_NT(rchallenge, response->PeerChallenge, user,
+ secret, secret_len, response->NTResp);
+
+ /* Generate the Authenticator Response. */
+ GenerateAuthenticatorResponse(secret, secret_len, response->NTResp,
+ response->PeerChallenge, rchallenge,
+ user, authResponse);
+
+ cstate->resp_length = MS_CHAP2_RESPONSE_LEN;
+
+#ifdef MPPE
+ SetMasterKeys(secret, secret_len, response->NTResp, authenticator);
+ mppe_keys_set = 1;
+#endif
+}
+
+#ifdef MPPE
+/*
+ * Set MPPE options from plugins.
+ */
+void
+set_mppe_enc_types(int policy, int types)
+{
+ /* Early exit for unknown policies. */
+ if (policy != MPPE_ENC_POL_ENC_ALLOWED ||
+ policy != MPPE_ENC_POL_ENC_REQUIRED)
+ return;
+
+ /* Don't modify MPPE if it's optional and wasn't already configured. */
+ if (policy == MPPE_ENC_POL_ENC_ALLOWED && !ccp_wantoptions[0].mppe)
+ return;
+
+ /*
+ * Disable undesirable encryption types. Note that we don't ENABLE
+ * any encryption types, to avoid overriding manual configuration.
+ */
+ switch(types) {
+ case MPPE_ENC_TYPES_RC4_40:
+ ccp_wantoptions[0].mppe &= ~MPPE_OPT_128; /* disable 128-bit */
+ break;
+ case MPPE_ENC_TYPES_RC4_128:
+ ccp_wantoptions[0].mppe &= ~MPPE_OPT_40; /* disable 40-bit */
+ break;
+ default:
+ break;
+ }
}
+#endif /* MPPE */
#endif /* CHAPMS */