1/*
2 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
3 * Use is subject to license terms.
4 */
5
6
7/*
8  * Copyright2001 by the Massachusetts Institute of Technology.
9 * Copyright 1993 by OpenVision Technologies, Inc.
10 *
11 * Permission to use, copy, modify, distribute, and sell this software
12 * and its documentation for any purpose is hereby granted without fee,
13 * provided that the above copyright notice appears in all copies and
14 * that both that copyright notice and this permission notice appear in
15 * supporting documentation, and that the name of OpenVision not be used
16 * in advertising or publicity pertaining to distribution of the software
17 * without specific, written prior permission. OpenVision makes no
18 * representations about the suitability of this software for any
19 * purpose.  It is provided "as is" without express or implied warranty.
20 *
21 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
22 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
23 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
24 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
25 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
26 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
27 * PERFORMANCE OF THIS SOFTWARE.
28 */
29
30/*
31 * Copyright (C) 1998 by the FundsXpress, INC.
32 *
33 * All rights reserved.
34 *
35 * Export of this software from the United States of America may require
36 * a specific license from the United States Government.  It is the
37 * responsibility of any person or organization contemplating export to
38 * obtain such a license before exporting.
39 *
40 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
41 * distribute this software and its documentation for any purpose and
42 * without fee is hereby granted, provided that the above copyright
43 * notice appear in all copies and that both that copyright notice and
44 * this permission notice appear in supporting documentation, and that
45 * the name of FundsXpress. not be used in advertising or publicity pertaining
46 * to distribution of the software without specific, written prior
47 * permission.  FundsXpress makes no representations about the suitability of
48 * this software for any purpose.  It is provided "as is" without express
49 * or implied warranty.
50 *
51 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
52 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
53 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
54 */
55
56/* Solaris Kerberos:  order is important here.  include gssapiP_krb5.h
57 * before all others, otherwise we get a LINT error from MALLOC macro
58 * being redefined in mechglueP.h */
59#include <gssapiP_krb5.h>
60#include <k5-int.h>
61
62/* Solaris Kerberos defines memory management macros in <krb5.h> */
63/* #include <memory.h> */
64
65/*
66 * $Id: util_crypt.c,v 1.11.6.3 2000/06/03 06:09:45 tlyu Exp $
67 */
68
69int
70kg_confounder_size(context, key)
71     krb5_context context;
72     krb5_keyblock *key;
73{
74   krb5_error_code code;
75   size_t blocksize;
76   /* We special case rc4*/
77   if (key->enctype == ENCTYPE_ARCFOUR_HMAC)
78     return 8;
79   code = krb5_c_block_size(context, key->enctype, &blocksize);
80   if (code)
81      return(-1); /* XXX */
82
83   return(blocksize);
84}
85
86krb5_error_code
87kg_make_confounder(context, key, buf)
88     krb5_context context;
89     krb5_keyblock *key;
90     unsigned char *buf;
91{
92   krb5_error_code code;
93   size_t blocksize;
94   krb5_data lrandom;
95
96   code = krb5_c_block_size(context, key->enctype, &blocksize);
97   if (code)
98       return(code);
99
100   lrandom.length = blocksize;
101   lrandom.data = (char *) buf;
102
103   return(krb5_c_random_make_octets(context, &lrandom));
104}
105
106int
107kg_encrypt_size(context, key, n)
108     krb5_context context;
109     krb5_keyblock *key;
110     int n;
111{
112   size_t enclen;
113
114   if (krb5_c_encrypt_length(context, key->enctype, n, &enclen) != 0)
115      return(-1); /* XXX */
116
117   return(enclen);
118}
119
120krb5_error_code
121kg_encrypt(context, key, usage, iv, in, out, length)
122     krb5_context context;
123     krb5_keyblock *key;
124     int usage;
125     krb5_pointer iv;
126     krb5_const_pointer in;
127     krb5_pointer out;
128     unsigned int length;
129{
130   krb5_error_code code;
131   size_t blocksize;
132   krb5_data ivd, *pivd, inputd;
133   krb5_enc_data outputd;
134
135   KRB5_LOG0(KRB5_INFO, "kg_encrypt() start.");
136
137   if (iv) {
138       code = krb5_c_block_size(context, key->enctype, &blocksize);
139       if (code)
140	   return(code);
141
142       ivd.length = blocksize;
143       ivd.data = MALLOC(ivd.length);
144       if (ivd.data == NULL)
145	   return ENOMEM;
146       (void) memcpy(ivd.data, iv, ivd.length);
147       pivd = &ivd;
148   } else {
149       pivd = NULL;
150   }
151
152   inputd.length = length;
153   inputd.data = (char *)in; /* Solaris Kerberos */
154
155   outputd.ciphertext.length = length;
156   outputd.ciphertext.data = out;
157
158   code = krb5_c_encrypt(context, key, usage, pivd, &inputd, &outputd);
159   if (pivd != NULL)
160       krb5_free_data_contents(context, pivd);
161
162   KRB5_LOG(KRB5_INFO, "kg_encrypt() end. code = %d", code);
163   return code;
164}
165
166/* length is the length of the cleartext. */
167
168krb5_error_code
169kg_decrypt(context, key, usage, iv, in, out, length)
170     krb5_context context;
171     krb5_keyblock *key;
172     int usage;
173     krb5_pointer iv;
174     krb5_const_pointer in;
175     krb5_pointer out;
176     unsigned int length;
177{
178   krb5_error_code code;
179   size_t blocksize;
180   krb5_data ivd, *pivd, outputd;
181   krb5_enc_data inputd;
182   KRB5_LOG0(KRB5_INFO, "kg_decrypt() start.");
183
184   if (iv) {
185       code = krb5_c_block_size(context, key->enctype, &blocksize);
186       if (code)
187	   return(code);
188
189       ivd.length = blocksize;
190       ivd.data = MALLOC(ivd.length);
191       if (ivd.data == NULL)
192	   return ENOMEM;
193       (void) memcpy(ivd.data, iv, ivd.length);
194       pivd = &ivd;
195   } else {
196       pivd = NULL;
197   }
198
199   inputd.enctype = ENCTYPE_UNKNOWN;
200   inputd.ciphertext.length = length;
201   inputd.ciphertext.data = (char *)in; /* Solaris Kerberos */
202
203   outputd.length = length;
204   outputd.data = out;
205
206   code = krb5_c_decrypt(context, key, usage, pivd, &inputd, &outputd);
207   if (pivd != NULL)
208       krb5_free_data_contents(context, pivd);
209
210   KRB5_LOG(KRB5_INFO, "kg_decrypt() end. code = %d", code);
211   return code;
212}
213
214krb5_error_code
215kg_arcfour_docrypt (krb5_context context,
216		const krb5_keyblock *longterm_key , int ms_usage,
217		const unsigned char *kd_data, size_t kd_data_len,
218		const unsigned char *input_buf, size_t input_len,
219		unsigned char *output_buf)
220{
221  krb5_error_code code;
222  krb5_data input, output;
223  krb5_keyblock seq_enc_key, usage_key;
224  unsigned char t[4];
225
226  KRB5_LOG0(KRB5_INFO, "kg_arcfour_docrypt() start");
227
228  bzero(&usage_key, sizeof(krb5_keyblock));
229  bzero(&seq_enc_key, sizeof(krb5_keyblock));
230
231  usage_key.length = longterm_key->length;
232  usage_key.contents = MALLOC(usage_key.length);
233  usage_key.enctype = longterm_key->enctype;
234  usage_key.dk_list = NULL;
235#ifdef _KERNEL
236
237  usage_key.kef_mt  = longterm_key->kef_mt;
238  code = init_key_kef(longterm_key->kef_mt, &usage_key);
239  if (code)
240	return (code);
241#endif /* _KERNEL */
242  if (usage_key.contents == NULL)
243    return (ENOMEM);
244  seq_enc_key.length = longterm_key->length;
245  seq_enc_key.contents = MALLOC(seq_enc_key.length);
246  seq_enc_key.enctype = longterm_key->enctype;
247  seq_enc_key.dk_list = NULL;
248#ifdef _KERNEL
249  seq_enc_key.kef_mt  = longterm_key->kef_mt;
250  code = init_key_kef(longterm_key->kef_mt, &seq_enc_key);
251  if (code)
252	return (code);
253#endif /* _KERNEL */
254  if (seq_enc_key.contents == NULL) {
255    FREE ((void *) usage_key.contents, usage_key.length);
256    return (ENOMEM);
257  }
258
259  t[0] = ms_usage &0xff;
260  t[1] = (ms_usage>>8) & 0xff;
261  t[2] = (ms_usage>>16) & 0xff;
262  t[3] = (ms_usage>>24) & 0xff;
263  input.data = (void *) &t;
264  input.length = 4;
265  output.data = (void *) usage_key.contents;
266  output.length = usage_key.length;
267#ifdef _KERNEL
268  code = krb5_hmac(context, longterm_key, &input, &output);
269#else
270  code = krb5_hmac(context, &krb5int_hash_md5,
271		longterm_key, 1, &input, &output);
272#endif /* _KERNEL */
273  if (code)
274    goto cleanup_arcfour;
275
276  input.data = ( void *) kd_data;
277  input.length = kd_data_len;
278  output.data = (void *) seq_enc_key.contents;
279#ifdef _KERNEL
280  code = krb5_hmac(context, &usage_key, &input, &output);
281#else
282  code = krb5_hmac(context, &krb5int_hash_md5,
283		&usage_key, 1, &input, &output);
284#endif /* _KERNEL */
285
286  if (code)
287    goto cleanup_arcfour;
288  input.data = ( void * ) input_buf;
289  input.length = input_len;
290  output.data = (void * ) output_buf;
291  output.length = input_len;
292
293  /*
294   * Call the arcfour encryption method directly here, we cannot
295   * use the standard "krb5_c_encrypt" interface because we just
296   * want the arcfour algorithm applied and not the additional MD5-HMAC
297   * which are applied when using the standard interface.
298   */
299  code = krb5int_enc_arcfour.encrypt(context, &seq_enc_key, 0, &input, &output);
300
301 cleanup_arcfour:
302  bzero ((void *) seq_enc_key.contents, seq_enc_key.length);
303  bzero ((void *) usage_key.contents, usage_key.length);
304  FREE ((void *) usage_key.contents, usage_key.length);
305  FREE ((void *) seq_enc_key.contents, seq_enc_key.length);
306
307  KRB5_LOG(KRB5_INFO, "kg_arcfour_docrypt() end code = %d", code);
308  return (code);
309}
310
311