1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/*
* Authentication module for the Micr$oft NTLM mechanism.
*
* This file is part of libESMTP, a library for submission of RFC 2822
* formatted electronic mail messages using the SMTP protocol described
* in RFC 2821.
*
* Copyright (C) 2002 Brian Stafford <brian@stafford.uklinux.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _XOPEN_SOURCE 500
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include "ntlm.h"
#include "auth-client.h"
#include "auth-plugin.h"
#if 0
/* This is handy for changing te value of the flags in the debugger. */
unsigned int t1flags = TYPE1_FLAGS;
#undef TYPE1_FLAGS
#define TYPE1_FLAGS t1flags
#endif
#define NELT(x) (sizeof x / sizeof x[0])
static int ntlm_init (void *pctx);
static void ntlm_destroy (void *ctx);
static const char *ntlm_response (void *ctx,
const char *challenge, int *len,
auth_interact_t interact, void *arg);
const struct auth_client_plugin sasl_client =
{
/* Plugin information */
"NTLM",
"NTLM Authentication Mechanism (Microsoft)",
/* Plugin instance */
ntlm_init,
ntlm_destroy,
/* Authentication */
ntlm_response,
0,
/* Security Layer */
0,
NULL,
NULL,
};
static const struct auth_client_request client_request[] =
{
{ "domain", AUTH_CLEARTEXT | AUTH_REALM, "Domain", 0, },
{ "user", AUTH_CLEARTEXT | AUTH_USER, "User Name", 0, },
{ "passphrase", AUTH_PASS, "Pass Phrase", 0, },
};
struct ntlm_context
{
int state;
char *result[NELT (client_request)];
char host[64];
char buf[256];
};
static int
ntlm_init (void *pctx)
{
struct ntlm_context *context;
context = malloc (sizeof (struct ntlm_context));
memset (context, 0, sizeof (struct ntlm_context));
*(void **) pctx = context;
return 1;
}
static void
ntlm_destroy (void *ctx)
{
struct ntlm_context *context = ctx;
memset (context, 0, sizeof (struct ntlm_context));
free (context);
}
static const char *
ntlm_response (void *ctx, const char *challenge, int *len,
auth_interact_t interact, void *arg)
{
struct ntlm_context *context = ctx;
unsigned char nonce[8];
unsigned char lm_resp[24], nt_resp[24];
unsigned int flags;
char *domain = NULL;
char *p;
switch (context->state)
{
case 0: /* build the authentication request */
context->state = 1;
if (!(*interact) (client_request, context->result, NELT (client_request),
arg))
break;
gethostname (context->host, sizeof context->host);
if ((p = strchr (context->host, '.')) != NULL)
*p = '\0';
*len = ntlm_build_type_1 (context->buf, sizeof context->buf, TYPE1_FLAGS,
context->result[0], context->host);
return context->buf;
case 1: /* compute a response based om the challenge */
context->state = 2;
if (!ntlm_parse_type_2 (challenge, *len, &flags, nonce, &domain))
break;
ntlm_responses (lm_resp, nt_resp, nonce, context->result[2]);
*len = ntlm_build_type_3 (context->buf, sizeof context->buf,
flags, lm_resp, nt_resp,
context->result[0], context->result[1],
context->host);
if (domain != NULL)
free (domain);
return context->buf;
}
*len = 0;
return NULL;
}
|
