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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/* -*- mode: c; indent-tabs-mode: nil -*- */
/*
* Copyright2001 by the Massachusetts Institute of Technology.
* Copyright 1993 by OpenVision Technologies, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appears in all copies and
* that both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of OpenVision not be used
* in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. OpenVision makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL OPENVISION 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.
*/
/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* All rights reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* 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.
*/
#include "k5-int.h"
#include "gssapiP_krb5.h"
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
int
kg_confounder_size(context, key)
krb5_context context;
krb5_keyblock *key;
{
krb5_error_code code;
size_t blocksize;
/* We special case rc4*/
if (key->enctype == ENCTYPE_ARCFOUR_HMAC)
return 8;
code = krb5_c_block_size(context, key->enctype, &blocksize);
if (code)
return(-1); /* XXX */
return(blocksize);
}
krb5_error_code
kg_make_confounder(context, key, buf)
krb5_context context;
krb5_keyblock *key;
unsigned char *buf;
{
krb5_error_code code;
size_t blocksize;
krb5_data lrandom;
code = krb5_c_block_size(context, key->enctype, &blocksize);
if (code)
return(code);
lrandom.length = blocksize;
lrandom.data = buf;
return(krb5_c_random_make_octets(context, &lrandom));
}
krb5_error_code
kg_encrypt(context, key, usage, iv, in, out, length)
krb5_context context;
krb5_keyblock *key;
int usage;
krb5_pointer iv;
krb5_const_pointer in;
krb5_pointer out;
unsigned int length;
{
krb5_error_code code;
size_t blocksize;
krb5_data ivd, *pivd, inputd;
krb5_enc_data outputd;
if (iv) {
code = krb5_c_block_size(context, key->enctype, &blocksize);
if (code)
return(code);
ivd.length = blocksize;
ivd.data = malloc(ivd.length);
if (ivd.data == NULL)
return ENOMEM;
memcpy(ivd.data, iv, ivd.length);
pivd = &ivd;
} else {
pivd = NULL;
}
inputd.length = length;
inputd.data = in;
outputd.ciphertext.length = length;
outputd.ciphertext.data = out;
code = krb5_c_encrypt(context, key, usage, pivd, &inputd, &outputd);
if (pivd != NULL)
free(pivd->data);
return code;
}
/* length is the length of the cleartext. */
krb5_error_code
kg_decrypt(context, key, usage, iv, in, out, length)
krb5_context context;
krb5_keyblock *key;
int usage;
krb5_pointer iv;
krb5_const_pointer in;
krb5_pointer out;
unsigned int length;
{
krb5_error_code code;
size_t blocksize;
krb5_data ivd, *pivd, outputd;
krb5_enc_data inputd;
if (iv) {
code = krb5_c_block_size(context, key->enctype, &blocksize);
if (code)
return(code);
ivd.length = blocksize;
ivd.data = malloc(ivd.length);
if (ivd.data == NULL)
return ENOMEM;
memcpy(ivd.data, iv, ivd.length);
pivd = &ivd;
} else {
pivd = NULL;
}
inputd.enctype = ENCTYPE_UNKNOWN;
inputd.ciphertext.length = length;
inputd.ciphertext.data = in;
outputd.length = length;
outputd.data = out;
code = krb5_c_decrypt(context, key, usage, pivd, &inputd, &outputd);
if (pivd != NULL)
free(pivd->data);
return code;
}
krb5_error_code
kg_arcfour_docrypt (const krb5_keyblock *longterm_key , int ms_usage,
const unsigned char *kd_data, size_t kd_data_len,
const unsigned char *input_buf, size_t input_len,
unsigned char *output_buf)
{
krb5_error_code code;
krb5_data input, output;
krb5int_access kaccess;
krb5_keyblock seq_enc_key, usage_key;
unsigned char t[4];
usage_key.length = longterm_key->length;
usage_key.contents = malloc(usage_key.length);
if (usage_key.contents == NULL)
return (ENOMEM);
seq_enc_key.length = longterm_key->length;
seq_enc_key.contents = malloc(seq_enc_key.length);
if (seq_enc_key.contents == NULL) {
free ((void *) usage_key.contents);
return (ENOMEM);
}
code = krb5int_accessor (&kaccess, KRB5INT_ACCESS_VERSION);
if (code)
goto cleanup_arcfour;
t[0] = ms_usage &0xff;
t[1] = (ms_usage>>8) & 0xff;
t[2] = (ms_usage>>16) & 0xff;
t[3] = (ms_usage>>24) & 0xff;
input.data = (void *) &t;
input.length = 4;
output.data = (void *) usage_key.contents;
output.length = usage_key.length;
code = (*kaccess.krb5_hmac) (kaccess.md5_hash_provider,
longterm_key, 1, &input, &output);
if (code)
goto cleanup_arcfour;
input.data = ( void *) kd_data;
input.length = kd_data_len;
output.data = (void *) seq_enc_key.contents;
code = (*kaccess.krb5_hmac) (kaccess.md5_hash_provider,
&usage_key, 1, &input, &output);
if (code)
goto cleanup_arcfour;
input.data = ( void * ) input_buf;
input.length = input_len;
output.data = (void * ) output_buf;
output.length = input_len;
code = ((*kaccess.arcfour_enc_provider->encrypt)(
&seq_enc_key, 0,
&input, &output));
cleanup_arcfour:
memset ((void *) seq_enc_key.contents, 0, seq_enc_key.length);
memset ((void *) usage_key.contents, 0, usage_key.length);
free ((void *) usage_key.contents);
free ((void *) seq_enc_key.contents);
return (code);
}
|
