* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static char rcsid[] = "$Id: chap_ms.c,v 1.1 1996/05/28 00:42:30 paulus Exp $";
-#endif
+/*
+ * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
+ *
+ * Implemented LANManager type password response to MS-CHAP challenges.
+ * Now pppd provides both NT style and LANMan style blocks, and the
+ * prefered is set by option "ms-lanman". Default is to use NT.
+ * The hash text (StdText) was taken from Win95 RASAPI32.DLL.
+ *
+ * You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
+ */
+
+#define RCSID "$Id: chap_ms.c,v 1.16 2002/03/01 14:39:18 dfs 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"
-
-#ifdef CHAPMS
+#ifndef USE_CRYPT
#include <des.h>
+#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. */
+static const char rcsid[] = RCSID;
+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 *));
+#endif
+
+#ifdef USE_CRYPT
+static void Expand __P((u_char *, u_char *));
+static void Collapse __P((u_char *, u_char *));
+#endif
+#ifdef MSLANMAN
+bool ms_lanman = 0; /* Use LanMan password instead of NT */
+ /* Has meaning only with MS-CHAP challenges */
+#endif
static void
ChallengeResponse(challenge, pwHash, response)
char ZPasswordHash[21];
BZERO(ZPasswordHash, sizeof(ZPasswordHash));
- BCOPY(pwHash, ZPasswordHash, 16);
+ BCOPY(pwHash, ZPasswordHash, MD4_SIGNATURE_SIZE);
#if 0
- log_packet(ZPasswordHash, sizeof(ZPasswordHash), "ChallengeResponse - ZPasswordHash");
+ dbglog("ChallengeResponse - ZPasswordHash %.*B",
+ sizeof(ZPasswordHash), ZPasswordHash);
#endif
DesEncrypt(challenge, ZPasswordHash + 0, response + 0);
DesEncrypt(challenge, ZPasswordHash + 14, response + 16);
#if 0
- log_packet(response, 24, "ChallengeResponse - response");
+ 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 */
+{
+ 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 : %.8B", clear));
+#endif
+
+ Expand(clear, des_input);
+ encrypt(des_input, 0);
+ Collapse(des_input, cipher);
+
+#if 0
+ CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %.8B", cipher));
#endif
}
+#else /* USE_CRYPT */
static void
DesEncrypt(clear, key, cipher)
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]));
+ CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet input : %.8B", clear));
#endif
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]));
+ CHAPDEBUG((LOG_INFO, "DesEncrypt: 8 octet output: %.8B", cipher));
#endif
}
+#endif /* USE_CRYPT */
+
static u_char Get7Bits(input, startBit)
u_char *input;
return word & 0xFE;
}
+#ifdef USE_CRYPT
+
+/* 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;
+{
+ 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
static void MakeKey(key, des_key)
u_char *key; /* IN 56 bit DES key missing parity bits */
des_key[6] = Get7Bits(key, 42);
des_key[7] = Get7Bits(key, 49);
+#ifndef USE_CRYPT
des_set_odd_parity((des_cblock *)des_key);
+#endif
#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]));
+ CHAPDEBUG((LOG_INFO, "MakeKey: 56-bit input : %.7B", key));
+ CHAPDEBUG((LOG_INFO, "MakeKey: 64-bit output: %.8B", des_key));
#endif
}
-#endif /* CHAPMS */
+static void
+ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, response)
+ char *rchallenge;
+ int rchallenge_len;
+ char *secret;
+ int secret_len;
+ MS_ChapResponse *response;
+{
+ int i;
+#ifdef __NetBSD__
+ /* NetBSD uses the libc md4 routines which take bytes instead of bits */
+ int mdlen = secret_len * 2;
+#else
+ int mdlen = secret_len * 2 * 8;
+#endif
+ MD4_CTX md4Context;
+ u_char hash[MD4_SIGNATURE_SIZE];
+ u_char unicodePassword[MAX_NT_PASSWORD * 2];
+
+ /* 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, mdlen);
+
+ MD4Final(hash, &md4Context); /* Tell MD4 we're done */
+
+ ChallengeResponse(rchallenge, hash, response->NTResp);
+}
+
+#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;
+{
+ int i;
+ u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
+ u_char PasswordHash[MD4_SIGNATURE_SIZE];
+ /* LANMan password is case insensitive */
+ 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 );
+ ChallengeResponse(rchallenge, PasswordHash, response->LANManResp);
+}
+#endif
void
ChapMS(cstate, rchallenge, rchallenge_len, secret, secret_len)
char *secret;
int secret_len;
{
-#ifdef CHAPMS
- int i;
- MDstruct md4Context;
MS_ChapResponse response;
- u_char unicodePassword[MAX_NT_PASSWORD * 2];
#if 0
CHAPDEBUG((LOG_INFO, "ChapMS: secret is '%.*s'", secret_len, secret));
#endif
-
BZERO(&response, sizeof(response));
- /* 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];
+ /* Calculate both always */
+ ChapMS_NT(rchallenge, rchallenge_len, secret, secret_len, &response);
- MDbegin(&md4Context);
- MDupdate(&md4Context, unicodePassword, secret_len * 2 * 8); /* Unicode is 2 bytes/char, *8 for bit count */
- MDupdate(&md4Context, NULL, 0); /* Tell MD4 we're done */
-
- ChallengeResponse(rchallenge, (char *)md4Context.buffer, response.NTResp);
+#ifdef MSLANMAN
+ ChapMS_LANMan(rchallenge, rchallenge_len, secret, secret_len, &response);
+ /* prefered method is set by option */
+ response.UseNT = !ms_lanman;
+#else
response.UseNT = 1;
+#endif
BCOPY(&response, cstate->response, MS_CHAP_RESPONSE_LEN);
cstate->resp_length = MS_CHAP_RESPONSE_LEN;
-#endif /* CHAPMS */
}
+
+#endif /* CHAPMS */
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