[457] | 1 | /*
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| 2 | * chap_ms.c - Microsoft MS-CHAP compatible implementation.
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| 3 | *
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| 4 | * Copyright (c) 1995 Eric Rosenquist. All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | *
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in
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| 15 | * the documentation and/or other materials provided with the
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| 16 | * distribution.
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| 17 | *
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| 18 | * 3. The name(s) of the authors of this software must not be used to
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| 19 | * endorse or promote products derived from this software without
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| 20 | * prior written permission.
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| 21 | *
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| 22 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
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| 23 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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| 24 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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| 25 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 26 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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| 27 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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| 28 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 29 | */
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| 30 |
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| 31 | /*
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| 32 | * Modifications by Lauri Pesonen / lpesonen@clinet.fi, april 1997
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| 33 | *
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| 34 | * Implemented LANManager type password response to MS-CHAP challenges.
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| 35 | * Now pppd provides both NT style and LANMan style blocks, and the
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| 36 | * prefered is set by option "ms-lanman". Default is to use NT.
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| 37 | * The hash text (StdText) was taken from Win95 RASAPI32.DLL.
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| 38 | *
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| 39 | * You should also use DOMAIN\\USERNAME as described in README.MSCHAP80
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| 40 | */
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| 41 |
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| 42 | /*
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| 43 | * Modifications by Frank Cusack, frank@google.com, March 2002.
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| 44 | *
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| 45 | * Implemented MS-CHAPv2 functionality, heavily based on sample
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| 46 | * implementation in RFC 2759. Implemented MPPE functionality,
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| 47 | * heavily based on sample implementation in RFC 3079.
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| 48 | *
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| 49 | * Copyright (c) 2002 Google, Inc. All rights reserved.
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| 50 | *
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| 51 | * Redistribution and use in source and binary forms, with or without
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| 52 | * modification, are permitted provided that the following conditions
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| 53 | * are met:
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| 54 | *
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| 55 | * 1. Redistributions of source code must retain the above copyright
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| 56 | * notice, this list of conditions and the following disclaimer.
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| 57 | *
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| 58 | * 2. Redistributions in binary form must reproduce the above copyright
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| 59 | * notice, this list of conditions and the following disclaimer in
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| 60 | * the documentation and/or other materials provided with the
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| 61 | * distribution.
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| 62 | *
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| 63 | * 3. The name(s) of the authors of this software must not be used to
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| 64 | * endorse or promote products derived from this software without
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| 65 | * prior written permission.
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| 66 | *
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| 67 | * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
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| 68 | * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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| 69 | * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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| 70 | * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 71 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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| 72 | * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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| 73 | * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 74 | *
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| 75 | */
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| 76 |
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| 77 | #include "netif/ppp/ppp_opts.h"
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| 78 | #if PPP_SUPPORT && MSCHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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| 79 |
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| 80 | #if 0 /* UNUSED */
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| 81 | #include <stdio.h>
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| 82 | #include <stdlib.h>
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| 83 | #include <string.h>
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| 84 | #include <ctype.h>
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| 85 | #include <sys/types.h>
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| 86 | #include <sys/time.h>
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| 87 | #include <unistd.h>
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| 88 | #endif /* UNUSED */
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| 89 |
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| 90 | #include "netif/ppp/ppp_impl.h"
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| 91 |
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| 92 | #include "netif/ppp/chap-new.h"
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| 93 | #include "netif/ppp/chap_ms.h"
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| 94 | #include "netif/ppp/pppcrypt.h"
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| 95 | #include "netif/ppp/magic.h"
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| 96 | #if MPPE_SUPPORT
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| 97 | #include "netif/ppp/mppe.h" /* For mppe_sha1_pad*, mppe_set_key() */
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| 98 | #endif /* MPPE_SUPPORT */
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| 99 |
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| 100 | #define SHA1_SIGNATURE_SIZE 20
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| 101 | #define MD4_SIGNATURE_SIZE 16 /* 16 bytes in a MD4 message digest */
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| 102 | #define MAX_NT_PASSWORD 256 /* Max (Unicode) chars in an NT pass */
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| 103 |
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| 104 | #define MS_CHAP_RESPONSE_LEN 49 /* Response length for MS-CHAP */
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| 105 | #define MS_CHAP2_RESPONSE_LEN 49 /* Response length for MS-CHAPv2 */
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| 106 | #define MS_AUTH_RESPONSE_LENGTH 40 /* MS-CHAPv2 authenticator response, */
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| 107 | /* as ASCII */
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| 108 |
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| 109 | /* Error codes for MS-CHAP failure messages. */
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| 110 | #define MS_CHAP_ERROR_RESTRICTED_LOGON_HOURS 646
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| 111 | #define MS_CHAP_ERROR_ACCT_DISABLED 647
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| 112 | #define MS_CHAP_ERROR_PASSWD_EXPIRED 648
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| 113 | #define MS_CHAP_ERROR_NO_DIALIN_PERMISSION 649
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| 114 | #define MS_CHAP_ERROR_AUTHENTICATION_FAILURE 691
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| 115 | #define MS_CHAP_ERROR_CHANGING_PASSWORD 709
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| 116 |
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| 117 | /*
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| 118 | * Offsets within the response field for MS-CHAP
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| 119 | */
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| 120 | #define MS_CHAP_LANMANRESP 0
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| 121 | #define MS_CHAP_LANMANRESP_LEN 24
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| 122 | #define MS_CHAP_NTRESP 24
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| 123 | #define MS_CHAP_NTRESP_LEN 24
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| 124 | #define MS_CHAP_USENT 48
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| 125 |
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| 126 | /*
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| 127 | * Offsets within the response field for MS-CHAP2
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| 128 | */
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| 129 | #define MS_CHAP2_PEER_CHALLENGE 0
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| 130 | #define MS_CHAP2_PEER_CHAL_LEN 16
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| 131 | #define MS_CHAP2_RESERVED_LEN 8
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| 132 | #define MS_CHAP2_NTRESP 24
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| 133 | #define MS_CHAP2_NTRESP_LEN 24
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| 134 | #define MS_CHAP2_FLAGS 48
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| 135 |
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| 136 | #if MPPE_SUPPORT
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| 137 | #if 0 /* UNUSED */
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| 138 | /* These values are the RADIUS attribute values--see RFC 2548. */
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| 139 | #define MPPE_ENC_POL_ENC_ALLOWED 1
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| 140 | #define MPPE_ENC_POL_ENC_REQUIRED 2
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| 141 | #define MPPE_ENC_TYPES_RC4_40 2
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| 142 | #define MPPE_ENC_TYPES_RC4_128 4
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| 143 |
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| 144 | /* used by plugins (using above values) */
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| 145 | extern void set_mppe_enc_types(int, int);
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| 146 | #endif /* UNUSED */
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| 147 | #endif /* MPPE_SUPPORT */
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| 148 |
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| 149 | /* Are we the authenticator or authenticatee? For MS-CHAPv2 key derivation. */
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| 150 | #define MS_CHAP2_AUTHENTICATEE 0
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| 151 | #define MS_CHAP2_AUTHENTICATOR 1
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| 152 |
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| 153 | static void ascii2unicode (const char[], int, u_char[]);
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| 154 | static void NTPasswordHash (u_char *, int, u_char[MD4_SIGNATURE_SIZE]);
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| 155 | static void ChallengeResponse (const u_char *, const u_char *, u_char[24]);
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| 156 | static void ChallengeHash (const u_char[16], const u_char *, const char *, u_char[8]);
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| 157 | static void ChapMS_NT (const u_char *, const char *, int, u_char[24]);
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| 158 | static void ChapMS2_NT (const u_char *, const u_char[16], const char *, const char *, int,
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| 159 | u_char[24]);
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| 160 | static void GenerateAuthenticatorResponsePlain
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| 161 | (const char*, int, u_char[24], const u_char[16], const u_char *,
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| 162 | const char *, u_char[41]);
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| 163 | #ifdef MSLANMAN
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| 164 | static void ChapMS_LANMan (u_char *, char *, int, u_char *);
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| 165 | #endif
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| 166 |
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| 167 | static void GenerateAuthenticatorResponse(const u_char PasswordHashHash[MD4_SIGNATURE_SIZE],
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| 168 | u_char NTResponse[24], const u_char PeerChallenge[16],
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| 169 | const u_char *rchallenge, const char *username,
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| 170 | u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1]);
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| 171 |
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| 172 | #if MPPE_SUPPORT
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| 173 | static void Set_Start_Key (ppp_pcb *pcb, const u_char *, const char *, int);
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| 174 | static void SetMasterKeys (ppp_pcb *pcb, const char *, int, u_char[24], int);
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| 175 | #endif /* MPPE_SUPPORT */
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| 176 |
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| 177 | static void ChapMS (ppp_pcb *pcb, const u_char *, const char *, int, u_char *);
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| 178 | static void ChapMS2 (ppp_pcb *pcb, const u_char *, const u_char *, const char *, const char *, int,
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| 179 | u_char *, u_char[MS_AUTH_RESPONSE_LENGTH+1], int);
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| 180 |
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| 181 | #ifdef MSLANMAN
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| 182 | bool ms_lanman = 0; /* Use LanMan password instead of NT */
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| 183 | /* Has meaning only with MS-CHAP challenges */
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| 184 | #endif
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| 185 |
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| 186 | #if MPPE_SUPPORT
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| 187 | #ifdef DEBUGMPPEKEY
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| 188 | /* For MPPE debug */
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| 189 | /* Use "[]|}{?/><,`!2&&(" (sans quotes) for RFC 3079 MS-CHAPv2 test value */
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| 190 | static char *mschap_challenge = NULL;
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| 191 | /* Use "!@\#$%^&*()_+:3|~" (sans quotes, backslash is to escape #) for ... */
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| 192 | static char *mschap2_peer_challenge = NULL;
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| 193 | #endif
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| 194 |
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| 195 | #include "netif/ppp/fsm.h" /* Need to poke MPPE options */
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| 196 | #include "netif/ppp/ccp.h"
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| 197 | #endif /* MPPE_SUPPORT */
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| 198 |
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| 199 | #if PPP_OPTIONS
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| 200 | /*
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| 201 | * Command-line options.
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| 202 | */
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| 203 | static option_t chapms_option_list[] = {
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| 204 | #ifdef MSLANMAN
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| 205 | { "ms-lanman", o_bool, &ms_lanman,
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| 206 | "Use LanMan passwd when using MS-CHAP", 1 },
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| 207 | #endif
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| 208 | #ifdef DEBUGMPPEKEY
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| 209 | { "mschap-challenge", o_string, &mschap_challenge,
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| 210 | "specify CHAP challenge" },
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| 211 | { "mschap2-peer-challenge", o_string, &mschap2_peer_challenge,
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| 212 | "specify CHAP peer challenge" },
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| 213 | #endif
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| 214 | { NULL }
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| 215 | };
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| 216 | #endif /* PPP_OPTIONS */
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| 217 |
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| 218 | #if PPP_SERVER
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| 219 | /*
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| 220 | * chapms_generate_challenge - generate a challenge for MS-CHAP.
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| 221 | * For MS-CHAP the challenge length is fixed at 8 bytes.
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| 222 | * The length goes in challenge[0] and the actual challenge starts
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| 223 | * at challenge[1].
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| 224 | */
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| 225 | static void chapms_generate_challenge(ppp_pcb *pcb, unsigned char *challenge) {
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| 226 | LWIP_UNUSED_ARG(pcb);
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| 227 |
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| 228 | *challenge++ = 8;
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| 229 | #ifdef DEBUGMPPEKEY
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| 230 | if (mschap_challenge && strlen(mschap_challenge) == 8)
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| 231 | memcpy(challenge, mschap_challenge, 8);
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| 232 | else
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| 233 | #endif
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| 234 | magic_random_bytes(challenge, 8);
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| 235 | }
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| 236 |
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| 237 | static void chapms2_generate_challenge(ppp_pcb *pcb, unsigned char *challenge) {
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| 238 | LWIP_UNUSED_ARG(pcb);
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| 239 |
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| 240 | *challenge++ = 16;
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| 241 | #ifdef DEBUGMPPEKEY
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| 242 | if (mschap_challenge && strlen(mschap_challenge) == 16)
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| 243 | memcpy(challenge, mschap_challenge, 16);
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| 244 | else
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| 245 | #endif
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| 246 | magic_random_bytes(challenge, 16);
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| 247 | }
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| 248 |
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| 249 | static int chapms_verify_response(ppp_pcb *pcb, int id, const char *name,
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| 250 | const unsigned char *secret, int secret_len,
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| 251 | const unsigned char *challenge, const unsigned char *response,
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| 252 | char *message, int message_space) {
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| 253 | unsigned char md[MS_CHAP_RESPONSE_LEN];
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| 254 | int diff;
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| 255 | int challenge_len, response_len;
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| 256 | LWIP_UNUSED_ARG(id);
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| 257 | LWIP_UNUSED_ARG(name);
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| 258 |
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| 259 | challenge_len = *challenge++; /* skip length, is 8 */
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| 260 | response_len = *response++;
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| 261 | if (response_len != MS_CHAP_RESPONSE_LEN)
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| 262 | goto bad;
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| 263 |
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| 264 | #ifndef MSLANMAN
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| 265 | if (!response[MS_CHAP_USENT]) {
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| 266 | /* Should really propagate this into the error packet. */
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| 267 | ppp_notice("Peer request for LANMAN auth not supported");
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| 268 | goto bad;
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| 269 | }
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| 270 | #endif
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| 271 |
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| 272 | /* Generate the expected response. */
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| 273 | ChapMS(pcb, (const u_char *)challenge, (const char *)secret, secret_len, md);
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| 274 |
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| 275 | #ifdef MSLANMAN
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| 276 | /* Determine which part of response to verify against */
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| 277 | if (!response[MS_CHAP_USENT])
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| 278 | diff = memcmp(&response[MS_CHAP_LANMANRESP],
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| 279 | &md[MS_CHAP_LANMANRESP], MS_CHAP_LANMANRESP_LEN);
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| 280 | else
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| 281 | #endif
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| 282 | diff = memcmp(&response[MS_CHAP_NTRESP], &md[MS_CHAP_NTRESP],
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| 283 | MS_CHAP_NTRESP_LEN);
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| 284 |
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| 285 | if (diff == 0) {
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| 286 | ppp_slprintf(message, message_space, "Access granted");
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| 287 | return 1;
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| 288 | }
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| 289 |
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| 290 | bad:
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| 291 | /* See comments below for MS-CHAP V2 */
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| 292 | ppp_slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0",
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| 293 | challenge_len, challenge);
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| 294 | return 0;
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| 295 | }
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| 296 |
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| 297 | static int chapms2_verify_response(ppp_pcb *pcb, int id, const char *name,
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| 298 | const unsigned char *secret, int secret_len,
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| 299 | const unsigned char *challenge, const unsigned char *response,
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| 300 | char *message, int message_space) {
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| 301 | unsigned char md[MS_CHAP2_RESPONSE_LEN];
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| 302 | char saresponse[MS_AUTH_RESPONSE_LENGTH+1];
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| 303 | int challenge_len, response_len;
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| 304 | LWIP_UNUSED_ARG(id);
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| 305 |
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| 306 | challenge_len = *challenge++; /* skip length, is 16 */
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| 307 | response_len = *response++;
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| 308 | if (response_len != MS_CHAP2_RESPONSE_LEN)
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| 309 | goto bad; /* not even the right length */
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| 310 |
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| 311 | /* Generate the expected response and our mutual auth. */
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| 312 | ChapMS2(pcb, (const u_char*)challenge, (const u_char*)&response[MS_CHAP2_PEER_CHALLENGE], name,
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| 313 | (const char *)secret, secret_len, md,
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| 314 | (unsigned char *)saresponse, MS_CHAP2_AUTHENTICATOR);
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| 315 |
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| 316 | /* compare MDs and send the appropriate status */
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| 317 | /*
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| 318 | * Per RFC 2759, success message must be formatted as
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| 319 | * "S=<auth_string> M=<message>"
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| 320 | * where
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| 321 | * <auth_string> is the Authenticator Response (mutual auth)
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| 322 | * <message> is a text message
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| 323 | *
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| 324 | * However, some versions of Windows (win98 tested) do not know
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| 325 | * about the M=<message> part (required per RFC 2759) and flag
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| 326 | * it as an error (reported incorrectly as an encryption error
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| 327 | * to the user). Since the RFC requires it, and it can be
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| 328 | * useful information, we supply it if the peer is a conforming
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| 329 | * system. Luckily (?), win98 sets the Flags field to 0x04
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| 330 | * (contrary to RFC requirements) so we can use that to
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| 331 | * distinguish between conforming and non-conforming systems.
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| 332 | *
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| 333 | * Special thanks to Alex Swiridov <say@real.kharkov.ua> for
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| 334 | * help debugging this.
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| 335 | */
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| 336 | if (memcmp(&md[MS_CHAP2_NTRESP], &response[MS_CHAP2_NTRESP],
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| 337 | MS_CHAP2_NTRESP_LEN) == 0) {
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| 338 | if (response[MS_CHAP2_FLAGS])
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| 339 | ppp_slprintf(message, message_space, "S=%s", saresponse);
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| 340 | else
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| 341 | ppp_slprintf(message, message_space, "S=%s M=%s",
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| 342 | saresponse, "Access granted");
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| 343 | return 1;
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| 344 | }
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| 345 |
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| 346 | bad:
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| 347 | /*
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| 348 | * Failure message must be formatted as
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| 349 | * "E=e R=r C=c V=v M=m"
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| 350 | * where
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| 351 | * e = error code (we use 691, ERROR_AUTHENTICATION_FAILURE)
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| 352 | * r = retry (we use 1, ok to retry)
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| 353 | * c = challenge to use for next response, we reuse previous
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| 354 | * v = Change Password version supported, we use 0
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| 355 | * m = text message
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| 356 | *
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| 357 | * The M=m part is only for MS-CHAPv2. Neither win2k nor
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| 358 | * win98 (others untested) display the message to the user anyway.
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| 359 | * They also both ignore the E=e code.
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| 360 | *
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| 361 | * Note that it's safe to reuse the same challenge as we don't
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| 362 | * actually accept another response based on the error message
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| 363 | * (and no clients try to resend a response anyway).
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| 364 | *
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| 365 | * Basically, this whole bit is useless code, even the small
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| 366 | * implementation here is only because of overspecification.
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| 367 | */
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| 368 | ppp_slprintf(message, message_space, "E=691 R=1 C=%0.*B V=0 M=%s",
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| 369 | challenge_len, challenge, "Access denied");
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| 370 | return 0;
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| 371 | }
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| 372 | #endif /* PPP_SERVER */
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| 373 |
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| 374 | static void chapms_make_response(ppp_pcb *pcb, unsigned char *response, int id, const char *our_name,
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| 375 | const unsigned char *challenge, const char *secret, int secret_len,
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| 376 | unsigned char *private_) {
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| 377 | LWIP_UNUSED_ARG(id);
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| 378 | LWIP_UNUSED_ARG(our_name);
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| 379 | LWIP_UNUSED_ARG(private_);
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| 380 | challenge++; /* skip length, should be 8 */
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| 381 | *response++ = MS_CHAP_RESPONSE_LEN;
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| 382 | ChapMS(pcb, challenge, secret, secret_len, response);
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| 383 | }
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| 384 |
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| 385 | static void chapms2_make_response(ppp_pcb *pcb, unsigned char *response, int id, const char *our_name,
|
---|
| 386 | const unsigned char *challenge, const char *secret, int secret_len,
|
---|
| 387 | unsigned char *private_) {
|
---|
| 388 | LWIP_UNUSED_ARG(id);
|
---|
| 389 | challenge++; /* skip length, should be 16 */
|
---|
| 390 | *response++ = MS_CHAP2_RESPONSE_LEN;
|
---|
| 391 | ChapMS2(pcb, challenge,
|
---|
| 392 | #ifdef DEBUGMPPEKEY
|
---|
| 393 | mschap2_peer_challenge,
|
---|
| 394 | #else
|
---|
| 395 | NULL,
|
---|
| 396 | #endif
|
---|
| 397 | our_name, secret, secret_len, response, private_,
|
---|
| 398 | MS_CHAP2_AUTHENTICATEE);
|
---|
| 399 | }
|
---|
| 400 |
|
---|
| 401 | static int chapms2_check_success(ppp_pcb *pcb, unsigned char *msg, int len, unsigned char *private_) {
|
---|
| 402 | LWIP_UNUSED_ARG(pcb);
|
---|
| 403 |
|
---|
| 404 | if ((len < MS_AUTH_RESPONSE_LENGTH + 2) ||
|
---|
| 405 | strncmp((char *)msg, "S=", 2) != 0) {
|
---|
| 406 | /* Packet does not start with "S=" */
|
---|
| 407 | ppp_error("MS-CHAPv2 Success packet is badly formed.");
|
---|
| 408 | return 0;
|
---|
| 409 | }
|
---|
| 410 | msg += 2;
|
---|
| 411 | len -= 2;
|
---|
| 412 | if (len < MS_AUTH_RESPONSE_LENGTH
|
---|
| 413 | || memcmp(msg, private_, MS_AUTH_RESPONSE_LENGTH)) {
|
---|
| 414 | /* Authenticator Response did not match expected. */
|
---|
| 415 | ppp_error("MS-CHAPv2 mutual authentication failed.");
|
---|
| 416 | return 0;
|
---|
| 417 | }
|
---|
| 418 | /* Authenticator Response matches. */
|
---|
| 419 | msg += MS_AUTH_RESPONSE_LENGTH; /* Eat it */
|
---|
| 420 | len -= MS_AUTH_RESPONSE_LENGTH;
|
---|
| 421 | if ((len >= 3) && !strncmp((char *)msg, " M=", 3)) {
|
---|
| 422 | msg += 3; /* Eat the delimiter */
|
---|
| 423 | } else if (len) {
|
---|
| 424 | /* Packet has extra text which does not begin " M=" */
|
---|
| 425 | ppp_error("MS-CHAPv2 Success packet is badly formed.");
|
---|
| 426 | return 0;
|
---|
| 427 | }
|
---|
| 428 | return 1;
|
---|
| 429 | }
|
---|
| 430 |
|
---|
| 431 | static void chapms_handle_failure(ppp_pcb *pcb, unsigned char *inp, int len) {
|
---|
| 432 | int err;
|
---|
| 433 | const char *p;
|
---|
| 434 | char msg[64];
|
---|
| 435 | LWIP_UNUSED_ARG(pcb);
|
---|
| 436 |
|
---|
| 437 | /* We want a null-terminated string for strxxx(). */
|
---|
| 438 | len = LWIP_MIN(len, 63);
|
---|
| 439 | MEMCPY(msg, inp, len);
|
---|
| 440 | msg[len] = 0;
|
---|
| 441 | p = msg;
|
---|
| 442 |
|
---|
| 443 | /*
|
---|
| 444 | * Deal with MS-CHAP formatted failure messages; just print the
|
---|
| 445 | * M=<message> part (if any). For MS-CHAP we're not really supposed
|
---|
| 446 | * to use M=<message>, but it shouldn't hurt. See
|
---|
| 447 | * chapms[2]_verify_response.
|
---|
| 448 | */
|
---|
| 449 | if (!strncmp(p, "E=", 2))
|
---|
| 450 | err = strtol(p+2, NULL, 10); /* Remember the error code. */
|
---|
| 451 | else
|
---|
| 452 | goto print_msg; /* Message is badly formatted. */
|
---|
| 453 |
|
---|
| 454 | if (len && ((p = strstr(p, " M=")) != NULL)) {
|
---|
| 455 | /* M=<message> field found. */
|
---|
| 456 | p += 3;
|
---|
| 457 | } else {
|
---|
| 458 | /* No M=<message>; use the error code. */
|
---|
| 459 | switch (err) {
|
---|
| 460 | case MS_CHAP_ERROR_RESTRICTED_LOGON_HOURS:
|
---|
| 461 | p = "E=646 Restricted logon hours";
|
---|
| 462 | break;
|
---|
| 463 |
|
---|
| 464 | case MS_CHAP_ERROR_ACCT_DISABLED:
|
---|
| 465 | p = "E=647 Account disabled";
|
---|
| 466 | break;
|
---|
| 467 |
|
---|
| 468 | case MS_CHAP_ERROR_PASSWD_EXPIRED:
|
---|
| 469 | p = "E=648 Password expired";
|
---|
| 470 | break;
|
---|
| 471 |
|
---|
| 472 | case MS_CHAP_ERROR_NO_DIALIN_PERMISSION:
|
---|
| 473 | p = "E=649 No dialin permission";
|
---|
| 474 | break;
|
---|
| 475 |
|
---|
| 476 | case MS_CHAP_ERROR_AUTHENTICATION_FAILURE:
|
---|
| 477 | p = "E=691 Authentication failure";
|
---|
| 478 | break;
|
---|
| 479 |
|
---|
| 480 | case MS_CHAP_ERROR_CHANGING_PASSWORD:
|
---|
| 481 | /* Should never see this, we don't support Change Password. */
|
---|
| 482 | p = "E=709 Error changing password";
|
---|
| 483 | break;
|
---|
| 484 |
|
---|
| 485 | default:
|
---|
| 486 | ppp_error("Unknown MS-CHAP authentication failure: %.*v",
|
---|
| 487 | len, inp);
|
---|
| 488 | return;
|
---|
| 489 | }
|
---|
| 490 | }
|
---|
| 491 | print_msg:
|
---|
| 492 | if (p != NULL)
|
---|
| 493 | ppp_error("MS-CHAP authentication failed: %v", p);
|
---|
| 494 | }
|
---|
| 495 |
|
---|
| 496 | static void ChallengeResponse(const u_char *challenge,
|
---|
| 497 | const u_char PasswordHash[MD4_SIGNATURE_SIZE],
|
---|
| 498 | u_char response[24]) {
|
---|
| 499 | u_char ZPasswordHash[21];
|
---|
| 500 | lwip_des_context des;
|
---|
| 501 | u_char des_key[8];
|
---|
| 502 |
|
---|
| 503 | BZERO(ZPasswordHash, sizeof(ZPasswordHash));
|
---|
| 504 | MEMCPY(ZPasswordHash, PasswordHash, MD4_SIGNATURE_SIZE);
|
---|
| 505 |
|
---|
| 506 | #if 0
|
---|
| 507 | dbglog("ChallengeResponse - ZPasswordHash %.*B",
|
---|
| 508 | sizeof(ZPasswordHash), ZPasswordHash);
|
---|
| 509 | #endif
|
---|
| 510 |
|
---|
| 511 | pppcrypt_56_to_64_bit_key(ZPasswordHash + 0, des_key);
|
---|
| 512 | lwip_des_init(&des);
|
---|
| 513 | lwip_des_setkey_enc(&des, des_key);
|
---|
| 514 | lwip_des_crypt_ecb(&des, challenge, response +0);
|
---|
| 515 | lwip_des_free(&des);
|
---|
| 516 |
|
---|
| 517 | pppcrypt_56_to_64_bit_key(ZPasswordHash + 7, des_key);
|
---|
| 518 | lwip_des_init(&des);
|
---|
| 519 | lwip_des_setkey_enc(&des, des_key);
|
---|
| 520 | lwip_des_crypt_ecb(&des, challenge, response +8);
|
---|
| 521 | lwip_des_free(&des);
|
---|
| 522 |
|
---|
| 523 | pppcrypt_56_to_64_bit_key(ZPasswordHash + 14, des_key);
|
---|
| 524 | lwip_des_init(&des);
|
---|
| 525 | lwip_des_setkey_enc(&des, des_key);
|
---|
| 526 | lwip_des_crypt_ecb(&des, challenge, response +16);
|
---|
| 527 | lwip_des_free(&des);
|
---|
| 528 |
|
---|
| 529 | #if 0
|
---|
| 530 | dbglog("ChallengeResponse - response %.24B", response);
|
---|
| 531 | #endif
|
---|
| 532 | }
|
---|
| 533 |
|
---|
| 534 | static void ChallengeHash(const u_char PeerChallenge[16], const u_char *rchallenge,
|
---|
| 535 | const char *username, u_char Challenge[8]) {
|
---|
| 536 | lwip_sha1_context sha1Context;
|
---|
| 537 | u_char sha1Hash[SHA1_SIGNATURE_SIZE];
|
---|
| 538 | const char *user;
|
---|
| 539 |
|
---|
| 540 | /* remove domain from "domain\username" */
|
---|
| 541 | if ((user = strrchr(username, '\\')) != NULL)
|
---|
| 542 | ++user;
|
---|
| 543 | else
|
---|
| 544 | user = username;
|
---|
| 545 |
|
---|
| 546 | lwip_sha1_init(&sha1Context);
|
---|
| 547 | lwip_sha1_starts(&sha1Context);
|
---|
| 548 | lwip_sha1_update(&sha1Context, PeerChallenge, 16);
|
---|
| 549 | lwip_sha1_update(&sha1Context, rchallenge, 16);
|
---|
| 550 | lwip_sha1_update(&sha1Context, (const unsigned char*)user, strlen(user));
|
---|
| 551 | lwip_sha1_finish(&sha1Context, sha1Hash);
|
---|
| 552 | lwip_sha1_free(&sha1Context);
|
---|
| 553 |
|
---|
| 554 | MEMCPY(Challenge, sha1Hash, 8);
|
---|
| 555 | }
|
---|
| 556 |
|
---|
| 557 | /*
|
---|
| 558 | * Convert the ASCII version of the password to Unicode.
|
---|
| 559 | * This implicitly supports 8-bit ISO8859/1 characters.
|
---|
| 560 | * This gives us the little-endian representation, which
|
---|
| 561 | * is assumed by all M$ CHAP RFCs. (Unicode byte ordering
|
---|
| 562 | * is machine-dependent.)
|
---|
| 563 | */
|
---|
| 564 | static void ascii2unicode(const char ascii[], int ascii_len, u_char unicode[]) {
|
---|
| 565 | int i;
|
---|
| 566 |
|
---|
| 567 | BZERO(unicode, ascii_len * 2);
|
---|
| 568 | for (i = 0; i < ascii_len; i++)
|
---|
| 569 | unicode[i * 2] = (u_char) ascii[i];
|
---|
| 570 | }
|
---|
| 571 |
|
---|
| 572 | static void NTPasswordHash(u_char *secret, int secret_len, u_char hash[MD4_SIGNATURE_SIZE]) {
|
---|
| 573 | lwip_md4_context md4Context;
|
---|
| 574 |
|
---|
| 575 | lwip_md4_init(&md4Context);
|
---|
| 576 | lwip_md4_starts(&md4Context);
|
---|
| 577 | lwip_md4_update(&md4Context, secret, secret_len);
|
---|
| 578 | lwip_md4_finish(&md4Context, hash);
|
---|
| 579 | lwip_md4_free(&md4Context);
|
---|
| 580 | }
|
---|
| 581 |
|
---|
| 582 | static void ChapMS_NT(const u_char *rchallenge, const char *secret, int secret_len,
|
---|
| 583 | u_char NTResponse[24]) {
|
---|
| 584 | u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
---|
| 585 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
| 586 |
|
---|
| 587 | /* Hash the Unicode version of the secret (== password). */
|
---|
| 588 | ascii2unicode(secret, secret_len, unicodePassword);
|
---|
| 589 | NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
|
---|
| 590 |
|
---|
| 591 | ChallengeResponse(rchallenge, PasswordHash, NTResponse);
|
---|
| 592 | }
|
---|
| 593 |
|
---|
| 594 | static void ChapMS2_NT(const u_char *rchallenge, const u_char PeerChallenge[16], const char *username,
|
---|
| 595 | const char *secret, int secret_len, u_char NTResponse[24]) {
|
---|
| 596 | u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
---|
| 597 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
| 598 | u_char Challenge[8];
|
---|
| 599 |
|
---|
| 600 | ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
|
---|
| 601 |
|
---|
| 602 | /* Hash the Unicode version of the secret (== password). */
|
---|
| 603 | ascii2unicode(secret, secret_len, unicodePassword);
|
---|
| 604 | NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
|
---|
| 605 |
|
---|
| 606 | ChallengeResponse(Challenge, PasswordHash, NTResponse);
|
---|
| 607 | }
|
---|
| 608 |
|
---|
| 609 | #ifdef MSLANMAN
|
---|
| 610 | static u_char *StdText = (u_char *)"KGS!@#$%"; /* key from rasapi32.dll */
|
---|
| 611 |
|
---|
| 612 | static void ChapMS_LANMan(u_char *rchallenge, char *secret, int secret_len,
|
---|
| 613 | unsigned char *response) {
|
---|
| 614 | int i;
|
---|
| 615 | u_char UcasePassword[MAX_NT_PASSWORD]; /* max is actually 14 */
|
---|
| 616 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
| 617 | lwip_des_context des;
|
---|
| 618 | u_char des_key[8];
|
---|
| 619 |
|
---|
| 620 | /* LANMan password is case insensitive */
|
---|
| 621 | BZERO(UcasePassword, sizeof(UcasePassword));
|
---|
| 622 | for (i = 0; i < secret_len; i++)
|
---|
| 623 | UcasePassword[i] = (u_char)toupper(secret[i]);
|
---|
| 624 |
|
---|
| 625 | pppcrypt_56_to_64_bit_key(UcasePassword +0, des_key);
|
---|
| 626 | lwip_des_init(&des);
|
---|
| 627 | lwip_des_setkey_enc(&des, des_key);
|
---|
| 628 | lwip_des_crypt_ecb(&des, StdText, PasswordHash +0);
|
---|
| 629 | lwip_des_free(&des);
|
---|
| 630 |
|
---|
| 631 | pppcrypt_56_to_64_bit_key(UcasePassword +7, des_key);
|
---|
| 632 | lwip_des_init(&des);
|
---|
| 633 | lwip_des_setkey_enc(&des, des_key);
|
---|
| 634 | lwip_des_crypt_ecb(&des, StdText, PasswordHash +8);
|
---|
| 635 | lwip_des_free(&des);
|
---|
| 636 |
|
---|
| 637 | ChallengeResponse(rchallenge, PasswordHash, &response[MS_CHAP_LANMANRESP]);
|
---|
| 638 | }
|
---|
| 639 | #endif
|
---|
| 640 |
|
---|
| 641 |
|
---|
| 642 | static void GenerateAuthenticatorResponse(const u_char PasswordHashHash[MD4_SIGNATURE_SIZE],
|
---|
| 643 | u_char NTResponse[24], const u_char PeerChallenge[16],
|
---|
| 644 | const u_char *rchallenge, const char *username,
|
---|
| 645 | u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1]) {
|
---|
| 646 | /*
|
---|
| 647 | * "Magic" constants used in response generation, from RFC 2759.
|
---|
| 648 | */
|
---|
| 649 | static const u_char Magic1[39] = /* "Magic server to client signing constant" */
|
---|
| 650 | { 0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
|
---|
| 651 | 0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
|
---|
| 652 | 0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
|
---|
| 653 | 0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74 };
|
---|
| 654 | static const u_char Magic2[41] = /* "Pad to make it do more than one iteration" */
|
---|
| 655 | { 0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
|
---|
| 656 | 0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
|
---|
| 657 | 0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
|
---|
| 658 | 0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
|
---|
| 659 | 0x6E };
|
---|
| 660 |
|
---|
| 661 | int i;
|
---|
| 662 | lwip_sha1_context sha1Context;
|
---|
| 663 | u_char Digest[SHA1_SIGNATURE_SIZE];
|
---|
| 664 | u_char Challenge[8];
|
---|
| 665 |
|
---|
| 666 | lwip_sha1_init(&sha1Context);
|
---|
| 667 | lwip_sha1_starts(&sha1Context);
|
---|
| 668 | lwip_sha1_update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
|
---|
| 669 | lwip_sha1_update(&sha1Context, NTResponse, 24);
|
---|
| 670 | lwip_sha1_update(&sha1Context, Magic1, sizeof(Magic1));
|
---|
| 671 | lwip_sha1_finish(&sha1Context, Digest);
|
---|
| 672 | lwip_sha1_free(&sha1Context);
|
---|
| 673 |
|
---|
| 674 | ChallengeHash(PeerChallenge, rchallenge, username, Challenge);
|
---|
| 675 |
|
---|
| 676 | lwip_sha1_init(&sha1Context);
|
---|
| 677 | lwip_sha1_starts(&sha1Context);
|
---|
| 678 | lwip_sha1_update(&sha1Context, Digest, sizeof(Digest));
|
---|
| 679 | lwip_sha1_update(&sha1Context, Challenge, sizeof(Challenge));
|
---|
| 680 | lwip_sha1_update(&sha1Context, Magic2, sizeof(Magic2));
|
---|
| 681 | lwip_sha1_finish(&sha1Context, Digest);
|
---|
| 682 | lwip_sha1_free(&sha1Context);
|
---|
| 683 |
|
---|
| 684 | /* Convert to ASCII hex string. */
|
---|
| 685 | for (i = 0; i < LWIP_MAX((MS_AUTH_RESPONSE_LENGTH / 2), (int)sizeof(Digest)); i++)
|
---|
| 686 | sprintf((char *)&authResponse[i * 2], "%02X", Digest[i]);
|
---|
| 687 | }
|
---|
| 688 |
|
---|
| 689 |
|
---|
| 690 | static void GenerateAuthenticatorResponsePlain(
|
---|
| 691 | const char *secret, int secret_len,
|
---|
| 692 | u_char NTResponse[24], const u_char PeerChallenge[16],
|
---|
| 693 | const u_char *rchallenge, const char *username,
|
---|
| 694 | u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1]) {
|
---|
| 695 | u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
---|
| 696 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
| 697 | u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
|
---|
| 698 |
|
---|
| 699 | /* Hash (x2) the Unicode version of the secret (== password). */
|
---|
| 700 | ascii2unicode(secret, secret_len, unicodePassword);
|
---|
| 701 | NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
|
---|
| 702 | NTPasswordHash(PasswordHash, sizeof(PasswordHash),
|
---|
| 703 | PasswordHashHash);
|
---|
| 704 |
|
---|
| 705 | GenerateAuthenticatorResponse(PasswordHashHash, NTResponse, PeerChallenge,
|
---|
| 706 | rchallenge, username, authResponse);
|
---|
| 707 | }
|
---|
| 708 |
|
---|
| 709 |
|
---|
| 710 | #if MPPE_SUPPORT
|
---|
| 711 | /*
|
---|
| 712 | * Set mppe_xxxx_key from MS-CHAP credentials. (see RFC 3079)
|
---|
| 713 | */
|
---|
| 714 | static void Set_Start_Key(ppp_pcb *pcb, const u_char *rchallenge, const char *secret, int secret_len) {
|
---|
| 715 | u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
---|
| 716 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
| 717 | u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
|
---|
| 718 | lwip_sha1_context sha1Context;
|
---|
| 719 | u_char Digest[SHA1_SIGNATURE_SIZE]; /* >= MPPE_MAX_KEY_LEN */
|
---|
| 720 |
|
---|
| 721 | /* Hash (x2) the Unicode version of the secret (== password). */
|
---|
| 722 | ascii2unicode(secret, secret_len, unicodePassword);
|
---|
| 723 | NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
|
---|
| 724 | NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
|
---|
| 725 |
|
---|
| 726 | lwip_sha1_init(&sha1Context);
|
---|
| 727 | lwip_sha1_starts(&sha1Context);
|
---|
| 728 | lwip_sha1_update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
|
---|
| 729 | lwip_sha1_update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
|
---|
| 730 | lwip_sha1_update(&sha1Context, rchallenge, 8);
|
---|
| 731 | lwip_sha1_finish(&sha1Context, Digest);
|
---|
| 732 | lwip_sha1_free(&sha1Context);
|
---|
| 733 |
|
---|
| 734 | /* Same key in both directions. */
|
---|
| 735 | mppe_set_key(pcb, &pcb->mppe_comp, Digest);
|
---|
| 736 | mppe_set_key(pcb, &pcb->mppe_decomp, Digest);
|
---|
| 737 |
|
---|
| 738 | pcb->mppe_keys_set = 1;
|
---|
| 739 | }
|
---|
| 740 |
|
---|
| 741 | /*
|
---|
| 742 | * Set mppe_xxxx_key from MS-CHAPv2 credentials. (see RFC 3079)
|
---|
| 743 | */
|
---|
| 744 | static void SetMasterKeys(ppp_pcb *pcb, const char *secret, int secret_len, u_char NTResponse[24], int IsServer) {
|
---|
| 745 | u_char unicodePassword[MAX_NT_PASSWORD * 2];
|
---|
| 746 | u_char PasswordHash[MD4_SIGNATURE_SIZE];
|
---|
| 747 | u_char PasswordHashHash[MD4_SIGNATURE_SIZE];
|
---|
| 748 | lwip_sha1_context sha1Context;
|
---|
| 749 | u_char MasterKey[SHA1_SIGNATURE_SIZE]; /* >= MPPE_MAX_KEY_LEN */
|
---|
| 750 | u_char Digest[SHA1_SIGNATURE_SIZE]; /* >= MPPE_MAX_KEY_LEN */
|
---|
| 751 | const u_char *s;
|
---|
| 752 |
|
---|
| 753 | /* "This is the MPPE Master Key" */
|
---|
| 754 | static const u_char Magic1[27] =
|
---|
| 755 | { 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74,
|
---|
| 756 | 0x68, 0x65, 0x20, 0x4d, 0x50, 0x50, 0x45, 0x20, 0x4d,
|
---|
| 757 | 0x61, 0x73, 0x74, 0x65, 0x72, 0x20, 0x4b, 0x65, 0x79 };
|
---|
| 758 | /* "On the client side, this is the send key; "
|
---|
| 759 | "on the server side, it is the receive key." */
|
---|
| 760 | static const u_char Magic2[84] =
|
---|
| 761 | { 0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
|
---|
| 762 | 0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
|
---|
| 763 | 0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
|
---|
| 764 | 0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20, 0x6b, 0x65, 0x79,
|
---|
| 765 | 0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x73,
|
---|
| 766 | 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73, 0x69, 0x64, 0x65,
|
---|
| 767 | 0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
|
---|
| 768 | 0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
|
---|
| 769 | 0x6b, 0x65, 0x79, 0x2e };
|
---|
| 770 | /* "On the client side, this is the receive key; "
|
---|
| 771 | "on the server side, it is the send key." */
|
---|
| 772 | static const u_char Magic3[84] =
|
---|
| 773 | { 0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
|
---|
| 774 | 0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
|
---|
| 775 | 0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
|
---|
| 776 | 0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
|
---|
| 777 | 0x6b, 0x65, 0x79, 0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68,
|
---|
| 778 | 0x65, 0x20, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73,
|
---|
| 779 | 0x69, 0x64, 0x65, 0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73,
|
---|
| 780 | 0x20, 0x74, 0x68, 0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20,
|
---|
| 781 | 0x6b, 0x65, 0x79, 0x2e };
|
---|
| 782 |
|
---|
| 783 | /* Hash (x2) the Unicode version of the secret (== password). */
|
---|
| 784 | ascii2unicode(secret, secret_len, unicodePassword);
|
---|
| 785 | NTPasswordHash(unicodePassword, secret_len * 2, PasswordHash);
|
---|
| 786 | NTPasswordHash(PasswordHash, sizeof(PasswordHash), PasswordHashHash);
|
---|
| 787 |
|
---|
| 788 | lwip_sha1_init(&sha1Context);
|
---|
| 789 | lwip_sha1_starts(&sha1Context);
|
---|
| 790 | lwip_sha1_update(&sha1Context, PasswordHashHash, MD4_SIGNATURE_SIZE);
|
---|
| 791 | lwip_sha1_update(&sha1Context, NTResponse, 24);
|
---|
| 792 | lwip_sha1_update(&sha1Context, Magic1, sizeof(Magic1));
|
---|
| 793 | lwip_sha1_finish(&sha1Context, MasterKey);
|
---|
| 794 | lwip_sha1_free(&sha1Context);
|
---|
| 795 |
|
---|
| 796 | /*
|
---|
| 797 | * generate send key
|
---|
| 798 | */
|
---|
| 799 | if (IsServer)
|
---|
| 800 | s = Magic3;
|
---|
| 801 | else
|
---|
| 802 | s = Magic2;
|
---|
| 803 | lwip_sha1_init(&sha1Context);
|
---|
| 804 | lwip_sha1_starts(&sha1Context);
|
---|
| 805 | lwip_sha1_update(&sha1Context, MasterKey, 16);
|
---|
| 806 | lwip_sha1_update(&sha1Context, mppe_sha1_pad1, SHA1_PAD_SIZE);
|
---|
| 807 | lwip_sha1_update(&sha1Context, s, 84);
|
---|
| 808 | lwip_sha1_update(&sha1Context, mppe_sha1_pad2, SHA1_PAD_SIZE);
|
---|
| 809 | lwip_sha1_finish(&sha1Context, Digest);
|
---|
| 810 | lwip_sha1_free(&sha1Context);
|
---|
| 811 |
|
---|
| 812 | mppe_set_key(pcb, &pcb->mppe_comp, Digest);
|
---|
| 813 |
|
---|
| 814 | /*
|
---|
| 815 | * generate recv key
|
---|
| 816 | */
|
---|
| 817 | if (IsServer)
|
---|
| 818 | s = Magic2;
|
---|
| 819 | else
|
---|
| 820 | s = Magic3;
|
---|
| 821 | lwip_sha1_init(&sha1Context);
|
---|
| 822 | lwip_sha1_starts(&sha1Context);
|
---|
| 823 | lwip_sha1_update(&sha1Context, MasterKey, 16);
|
---|
| 824 | lwip_sha1_update(&sha1Context, mppe_sha1_pad1, SHA1_PAD_SIZE);
|
---|
| 825 | lwip_sha1_update(&sha1Context, s, 84);
|
---|
| 826 | lwip_sha1_update(&sha1Context, mppe_sha1_pad2, SHA1_PAD_SIZE);
|
---|
| 827 | lwip_sha1_finish(&sha1Context, Digest);
|
---|
| 828 | lwip_sha1_free(&sha1Context);
|
---|
| 829 |
|
---|
| 830 | mppe_set_key(pcb, &pcb->mppe_decomp, Digest);
|
---|
| 831 |
|
---|
| 832 | pcb->mppe_keys_set = 1;
|
---|
| 833 | }
|
---|
| 834 |
|
---|
| 835 | #endif /* MPPE_SUPPORT */
|
---|
| 836 |
|
---|
| 837 |
|
---|
| 838 | static void ChapMS(ppp_pcb *pcb, const u_char *rchallenge, const char *secret, int secret_len,
|
---|
| 839 | unsigned char *response) {
|
---|
| 840 | #if !MPPE_SUPPORT
|
---|
| 841 | LWIP_UNUSED_ARG(pcb);
|
---|
| 842 | #endif /* !MPPE_SUPPORT */
|
---|
| 843 | BZERO(response, MS_CHAP_RESPONSE_LEN);
|
---|
| 844 |
|
---|
| 845 | ChapMS_NT(rchallenge, secret, secret_len, &response[MS_CHAP_NTRESP]);
|
---|
| 846 |
|
---|
| 847 | #ifdef MSLANMAN
|
---|
| 848 | ChapMS_LANMan(rchallenge, secret, secret_len,
|
---|
| 849 | &response[MS_CHAP_LANMANRESP]);
|
---|
| 850 |
|
---|
| 851 | /* preferred method is set by option */
|
---|
| 852 | response[MS_CHAP_USENT] = !ms_lanman;
|
---|
| 853 | #else
|
---|
| 854 | response[MS_CHAP_USENT] = 1;
|
---|
| 855 | #endif
|
---|
| 856 |
|
---|
| 857 | #if MPPE_SUPPORT
|
---|
| 858 | Set_Start_Key(pcb, rchallenge, secret, secret_len);
|
---|
| 859 | #endif /* MPPE_SUPPORT */
|
---|
| 860 | }
|
---|
| 861 |
|
---|
| 862 |
|
---|
| 863 | /*
|
---|
| 864 | * If PeerChallenge is NULL, one is generated and the PeerChallenge
|
---|
| 865 | * field of response is filled in. Call this way when generating a response.
|
---|
| 866 | * If PeerChallenge is supplied, it is copied into the PeerChallenge field.
|
---|
| 867 | * Call this way when verifying a response (or debugging).
|
---|
| 868 | * Do not call with PeerChallenge = response.
|
---|
| 869 | *
|
---|
| 870 | * The PeerChallenge field of response is then used for calculation of the
|
---|
| 871 | * Authenticator Response.
|
---|
| 872 | */
|
---|
| 873 | static void ChapMS2(ppp_pcb *pcb, const u_char *rchallenge, const u_char *PeerChallenge,
|
---|
| 874 | const char *user, const char *secret, int secret_len, unsigned char *response,
|
---|
| 875 | u_char authResponse[], int authenticator) {
|
---|
| 876 | /* ARGSUSED */
|
---|
| 877 | LWIP_UNUSED_ARG(authenticator);
|
---|
| 878 | #if !MPPE_SUPPORT
|
---|
| 879 | LWIP_UNUSED_ARG(pcb);
|
---|
| 880 | #endif /* !MPPE_SUPPORT */
|
---|
| 881 |
|
---|
| 882 | BZERO(response, MS_CHAP2_RESPONSE_LEN);
|
---|
| 883 |
|
---|
| 884 | /* Generate the Peer-Challenge if requested, or copy it if supplied. */
|
---|
| 885 | if (!PeerChallenge)
|
---|
| 886 | magic_random_bytes(&response[MS_CHAP2_PEER_CHALLENGE], MS_CHAP2_PEER_CHAL_LEN);
|
---|
| 887 | else
|
---|
| 888 | MEMCPY(&response[MS_CHAP2_PEER_CHALLENGE], PeerChallenge,
|
---|
| 889 | MS_CHAP2_PEER_CHAL_LEN);
|
---|
| 890 |
|
---|
| 891 | /* Generate the NT-Response */
|
---|
| 892 | ChapMS2_NT(rchallenge, &response[MS_CHAP2_PEER_CHALLENGE], user,
|
---|
| 893 | secret, secret_len, &response[MS_CHAP2_NTRESP]);
|
---|
| 894 |
|
---|
| 895 | /* Generate the Authenticator Response. */
|
---|
| 896 | GenerateAuthenticatorResponsePlain(secret, secret_len,
|
---|
| 897 | &response[MS_CHAP2_NTRESP],
|
---|
| 898 | &response[MS_CHAP2_PEER_CHALLENGE],
|
---|
| 899 | rchallenge, user, authResponse);
|
---|
| 900 |
|
---|
| 901 | #if MPPE_SUPPORT
|
---|
| 902 | SetMasterKeys(pcb, secret, secret_len,
|
---|
| 903 | &response[MS_CHAP2_NTRESP], authenticator);
|
---|
| 904 | #endif /* MPPE_SUPPORT */
|
---|
| 905 | }
|
---|
| 906 |
|
---|
| 907 | #if 0 /* UNUSED */
|
---|
| 908 | #if MPPE_SUPPORT
|
---|
| 909 | /*
|
---|
| 910 | * Set MPPE options from plugins.
|
---|
| 911 | */
|
---|
| 912 | void set_mppe_enc_types(int policy, int types) {
|
---|
| 913 | /* Early exit for unknown policies. */
|
---|
| 914 | if (policy != MPPE_ENC_POL_ENC_ALLOWED ||
|
---|
| 915 | policy != MPPE_ENC_POL_ENC_REQUIRED)
|
---|
| 916 | return;
|
---|
| 917 |
|
---|
| 918 | /* Don't modify MPPE if it's optional and wasn't already configured. */
|
---|
| 919 | if (policy == MPPE_ENC_POL_ENC_ALLOWED && !ccp_wantoptions[0].mppe)
|
---|
| 920 | return;
|
---|
| 921 |
|
---|
| 922 | /*
|
---|
| 923 | * Disable undesirable encryption types. Note that we don't ENABLE
|
---|
| 924 | * any encryption types, to avoid overriding manual configuration.
|
---|
| 925 | */
|
---|
| 926 | switch(types) {
|
---|
| 927 | case MPPE_ENC_TYPES_RC4_40:
|
---|
| 928 | ccp_wantoptions[0].mppe &= ~MPPE_OPT_128; /* disable 128-bit */
|
---|
| 929 | break;
|
---|
| 930 | case MPPE_ENC_TYPES_RC4_128:
|
---|
| 931 | ccp_wantoptions[0].mppe &= ~MPPE_OPT_40; /* disable 40-bit */
|
---|
| 932 | break;
|
---|
| 933 | default:
|
---|
| 934 | break;
|
---|
| 935 | }
|
---|
| 936 | }
|
---|
| 937 | #endif /* MPPE_SUPPORT */
|
---|
| 938 | #endif /* UNUSED */
|
---|
| 939 |
|
---|
| 940 | const struct chap_digest_type chapms_digest = {
|
---|
| 941 | CHAP_MICROSOFT, /* code */
|
---|
| 942 | #if PPP_SERVER
|
---|
| 943 | chapms_generate_challenge,
|
---|
| 944 | chapms_verify_response,
|
---|
| 945 | #endif /* PPP_SERVER */
|
---|
| 946 | chapms_make_response,
|
---|
| 947 | NULL, /* check_success */
|
---|
| 948 | chapms_handle_failure,
|
---|
| 949 | };
|
---|
| 950 |
|
---|
| 951 | const struct chap_digest_type chapms2_digest = {
|
---|
| 952 | CHAP_MICROSOFT_V2, /* code */
|
---|
| 953 | #if PPP_SERVER
|
---|
| 954 | chapms2_generate_challenge,
|
---|
| 955 | chapms2_verify_response,
|
---|
| 956 | #endif /* PPP_SERVER */
|
---|
| 957 | chapms2_make_response,
|
---|
| 958 | chapms2_check_success,
|
---|
| 959 | chapms_handle_failure,
|
---|
| 960 | };
|
---|
| 961 |
|
---|
| 962 | #endif /* PPP_SUPPORT && MSCHAP_SUPPORT */
|
---|