source: heimdal/trunk/lib/krb5/salt.c@ 7

Last change on this file since 7 was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 9.0 KB
Line 
1/*
2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * 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 the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "krb5_locl.h"
35
36/* coverity[+alloc : arg-*3] */
37KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
38krb5_salttype_to_string (krb5_context context,
39 krb5_enctype etype,
40 krb5_salttype stype,
41 char **string)
42{
43 struct _krb5_encryption_type *e;
44 struct salt_type *st;
45
46 e = _krb5_find_enctype (etype);
47 if (e == NULL) {
48 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
49 "encryption type %d not supported",
50 etype);
51 return KRB5_PROG_ETYPE_NOSUPP;
52 }
53 for (st = e->keytype->string_to_key; st && st->type; st++) {
54 if (st->type == stype) {
55 *string = strdup (st->name);
56 if (*string == NULL) {
57 krb5_set_error_message (context, ENOMEM,
58 N_("malloc: out of memory", ""));
59 return ENOMEM;
60 }
61 return 0;
62 }
63 }
64 krb5_set_error_message (context, HEIM_ERR_SALTTYPE_NOSUPP,
65 "salttype %d not supported", stype);
66 return HEIM_ERR_SALTTYPE_NOSUPP;
67}
68
69KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
70krb5_string_to_salttype (krb5_context context,
71 krb5_enctype etype,
72 const char *string,
73 krb5_salttype *salttype)
74{
75 struct _krb5_encryption_type *e;
76 struct salt_type *st;
77
78 e = _krb5_find_enctype (etype);
79 if (e == NULL) {
80 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
81 N_("encryption type %d not supported", ""),
82 etype);
83 return KRB5_PROG_ETYPE_NOSUPP;
84 }
85 for (st = e->keytype->string_to_key; st && st->type; st++) {
86 if (strcasecmp (st->name, string) == 0) {
87 *salttype = st->type;
88 return 0;
89 }
90 }
91 krb5_set_error_message(context, HEIM_ERR_SALTTYPE_NOSUPP,
92 N_("salttype %s not supported", ""), string);
93 return HEIM_ERR_SALTTYPE_NOSUPP;
94}
95
96KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
97krb5_get_pw_salt(krb5_context context,
98 krb5_const_principal principal,
99 krb5_salt *salt)
100{
101 size_t len;
102 size_t i;
103 krb5_error_code ret;
104 char *p;
105
106 salt->salttype = KRB5_PW_SALT;
107 len = strlen(principal->realm);
108 for (i = 0; i < principal->name.name_string.len; ++i)
109 len += strlen(principal->name.name_string.val[i]);
110 ret = krb5_data_alloc (&salt->saltvalue, len);
111 if (ret)
112 return ret;
113 p = salt->saltvalue.data;
114 memcpy (p, principal->realm, strlen(principal->realm));
115 p += strlen(principal->realm);
116 for (i = 0; i < principal->name.name_string.len; ++i) {
117 memcpy (p,
118 principal->name.name_string.val[i],
119 strlen(principal->name.name_string.val[i]));
120 p += strlen(principal->name.name_string.val[i]);
121 }
122 return 0;
123}
124
125KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
126krb5_free_salt(krb5_context context,
127 krb5_salt salt)
128{
129 krb5_data_free(&salt.saltvalue);
130 return 0;
131}
132
133KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
134krb5_string_to_key_data (krb5_context context,
135 krb5_enctype enctype,
136 krb5_data password,
137 krb5_principal principal,
138 krb5_keyblock *key)
139{
140 krb5_error_code ret;
141 krb5_salt salt;
142
143 ret = krb5_get_pw_salt(context, principal, &salt);
144 if(ret)
145 return ret;
146 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
147 krb5_free_salt(context, salt);
148 return ret;
149}
150
151KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
152krb5_string_to_key (krb5_context context,
153 krb5_enctype enctype,
154 const char *password,
155 krb5_principal principal,
156 krb5_keyblock *key)
157{
158 krb5_data pw;
159 pw.data = rk_UNCONST(password);
160 pw.length = strlen(password);
161 return krb5_string_to_key_data(context, enctype, pw, principal, key);
162}
163
164KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
165krb5_string_to_key_data_salt (krb5_context context,
166 krb5_enctype enctype,
167 krb5_data password,
168 krb5_salt salt,
169 krb5_keyblock *key)
170{
171 krb5_data opaque;
172 krb5_data_zero(&opaque);
173 return krb5_string_to_key_data_salt_opaque(context, enctype, password,
174 salt, opaque, key);
175}
176
177/*
178 * Do a string -> key for encryption type `enctype' operation on
179 * `password' (with salt `salt' and the enctype specific data string
180 * `opaque'), returning the resulting key in `key'
181 */
182
183KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
184krb5_string_to_key_data_salt_opaque (krb5_context context,
185 krb5_enctype enctype,
186 krb5_data password,
187 krb5_salt salt,
188 krb5_data opaque,
189 krb5_keyblock *key)
190{
191 struct _krb5_encryption_type *et =_krb5_find_enctype(enctype);
192 struct salt_type *st;
193 if(et == NULL) {
194 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
195 N_("encryption type %d not supported", ""),
196 enctype);
197 return KRB5_PROG_ETYPE_NOSUPP;
198 }
199 for(st = et->keytype->string_to_key; st && st->type; st++)
200 if(st->type == salt.salttype)
201 return (*st->string_to_key)(context, enctype, password,
202 salt, opaque, key);
203 krb5_set_error_message(context, HEIM_ERR_SALTTYPE_NOSUPP,
204 N_("salt type %d not supported", ""),
205 salt.salttype);
206 return HEIM_ERR_SALTTYPE_NOSUPP;
207}
208
209/*
210 * Do a string -> key for encryption type `enctype' operation on the
211 * string `password' (with salt `salt'), returning the resulting key
212 * in `key'
213 */
214
215KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
216krb5_string_to_key_salt (krb5_context context,
217 krb5_enctype enctype,
218 const char *password,
219 krb5_salt salt,
220 krb5_keyblock *key)
221{
222 krb5_data pw;
223 pw.data = rk_UNCONST(password);
224 pw.length = strlen(password);
225 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
226}
227
228KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
229krb5_string_to_key_salt_opaque (krb5_context context,
230 krb5_enctype enctype,
231 const char *password,
232 krb5_salt salt,
233 krb5_data opaque,
234 krb5_keyblock *key)
235{
236 krb5_data pw;
237 pw.data = rk_UNCONST(password);
238 pw.length = strlen(password);
239 return krb5_string_to_key_data_salt_opaque(context, enctype,
240 pw, salt, opaque, key);
241}
242
243
244KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
245krb5_string_to_key_derived(krb5_context context,
246 const void *str,
247 size_t len,
248 krb5_enctype etype,
249 krb5_keyblock *key)
250{
251 struct _krb5_encryption_type *et = _krb5_find_enctype(etype);
252 krb5_error_code ret;
253 struct _krb5_key_data kd;
254 size_t keylen;
255 u_char *tmp;
256
257 if(et == NULL) {
258 krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
259 N_("encryption type %d not supported", ""),
260 etype);
261 return KRB5_PROG_ETYPE_NOSUPP;
262 }
263 keylen = et->keytype->bits / 8;
264
265 ALLOC(kd.key, 1);
266 if(kd.key == NULL) {
267 krb5_set_error_message (context, ENOMEM,
268 N_("malloc: out of memory", ""));
269 return ENOMEM;
270 }
271 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
272 if(ret) {
273 free(kd.key);
274 return ret;
275 }
276 kd.key->keytype = etype;
277 tmp = malloc (keylen);
278 if(tmp == NULL) {
279 krb5_free_keyblock(context, kd.key);
280 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
281 return ENOMEM;
282 }
283 ret = _krb5_n_fold(str, len, tmp, keylen);
284 if (ret) {
285 free(tmp);
286 krb5_set_error_message (context, ENOMEM, N_("malloc: out of memory", ""));
287 return ret;
288 }
289 kd.schedule = NULL;
290 _krb5_DES3_random_to_key(context, kd.key, tmp, keylen);
291 memset(tmp, 0, keylen);
292 free(tmp);
293 ret = _krb5_derive_key(context,
294 et,
295 &kd,
296 "kerberos", /* XXX well known constant */
297 strlen("kerberos"));
298 if (ret) {
299 _krb5_free_key_data(context, &kd, et);
300 return ret;
301 }
302 ret = krb5_copy_keyblock_contents(context, kd.key, key);
303 _krb5_free_key_data(context, &kd, et);
304 return ret;
305}
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