1 /*
2  * chap_ms.h - Challenge Handshake Authentication Protocol definitions.
3  *
4  * Copyright (c) 1995 Eric Rosenquist.  All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  *
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in
15  *    the documentation and/or other materials provided with the
16  *    distribution.
17  *
18  * 3. The name(s) of the authors of this software must not be used to
19  *    endorse or promote products derived from this software without
20  *    prior written permission.
21  *
22  * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
23  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
24  * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
26  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
27  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
28  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
29  *
30  * $Id: chap_ms.h,v 1.13 2004/11/15 22:13:26 paulus Exp $
31  */
32 
33 #ifndef __CHAPMS_INCLUDE__
34 
35 #define MD4_SIGNATURE_SIZE	16	/* 16 bytes in a MD4 message digest */
36 #define MAX_NT_PASSWORD		256	/* Max (Unicode) chars in an NT pass */
37 
38 #define MS_CHAP_RESPONSE_LEN	49	/* Response length for MS-CHAP */
39 #define MS_CHAP2_RESPONSE_LEN	49	/* Response length for MS-CHAPv2 */
40 #define MS_AUTH_RESPONSE_LENGTH	40	/* MS-CHAPv2 authenticator response, */
41 					/* as ASCII */
42 
43 /* E=eeeeeeeeee error codes for MS-CHAP failure messages. */
44 #define MS_CHAP_ERROR_RESTRICTED_LOGON_HOURS	646
45 #define MS_CHAP_ERROR_ACCT_DISABLED		647
46 #define MS_CHAP_ERROR_PASSWD_EXPIRED		648
47 #define MS_CHAP_ERROR_NO_DIALIN_PERMISSION	649
48 #define MS_CHAP_ERROR_AUTHENTICATION_FAILURE	691
49 #define MS_CHAP_ERROR_CHANGING_PASSWORD		709
50 
51 /*
52  * Offsets within the response field for MS-CHAP
53  */
54 #define MS_CHAP_LANMANRESP	0
55 #define MS_CHAP_LANMANRESP_LEN	24
56 #define MS_CHAP_NTRESP		24
57 #define MS_CHAP_NTRESP_LEN	24
58 #define MS_CHAP_USENT		48
59 
60 /*
61  * Offsets within the response field for MS-CHAP2
62  */
63 #define MS_CHAP2_PEER_CHALLENGE	0
64 #define MS_CHAP2_PEER_CHAL_LEN	16
65 #define MS_CHAP2_RESERVED_LEN	8
66 #define MS_CHAP2_NTRESP		24
67 #define MS_CHAP2_NTRESP_LEN	24
68 #define MS_CHAP2_FLAGS		48
69 
70 #ifdef MPPE
71 #include "mppe.h"	/* MPPE_MAX_KEY_LEN */
72 extern u_char mppe_send_key[MPPE_MAX_KEY_LEN];
73 extern u_char mppe_recv_key[MPPE_MAX_KEY_LEN];
74 extern int mppe_keys_set;
75 
76 /* These values are the RADIUS attribute values--see RFC 2548. */
77 #define MPPE_ENC_POL_ENC_ALLOWED 1
78 #define MPPE_ENC_POL_ENC_REQUIRED 2
79 #define MPPE_ENC_TYPES_RC4_40 2
80 #define MPPE_ENC_TYPES_RC4_128 4
81 
82 /* used by plugins (using above values) */
83 extern void set_mppe_enc_types(int, int);
84 #endif
85 
86 /* Are we the authenticator or authenticatee?  For MS-CHAPv2 key derivation. */
87 #define MS_CHAP2_AUTHENTICATEE 0
88 #define MS_CHAP2_AUTHENTICATOR 1
89 
90 void ChapMS __P((u_char *, char *, int, u_char *));
91 void ChapMS2 __P((u_char *, u_char *, char *, char *, int,
92 		  u_char *, u_char[MS_AUTH_RESPONSE_LENGTH+1], int));
93 #ifdef MPPE
94 void mppe_set_keys __P((u_char *, u_char[MD4_SIGNATURE_SIZE]));
95 void mppe_set_keys2(u_char PasswordHashHash[MD4_SIGNATURE_SIZE],
96 		    u_char NTResponse[24], int IsServer);
97 #endif
98 
99 void	ChallengeHash __P((u_char[16], u_char *, char *, u_char[8]));
100 
101 void GenerateAuthenticatorResponse(u_char PasswordHashHash[MD4_SIGNATURE_SIZE],
102 			u_char NTResponse[24], u_char PeerChallenge[16],
103 			u_char *rchallenge, char *username,
104 			u_char authResponse[MS_AUTH_RESPONSE_LENGTH+1]);
105 
106 void chapms_init(void);
107 
108 #define __CHAPMS_INCLUDE__
109 #endif /* __CHAPMS_INCLUDE__ */
110