1 /* $NetBSD: salt.c,v 1.5 2023/06/19 21:41:44 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "krb5_locl.h"
37
38 /* coverity[+alloc : arg-*3] */
39 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_salttype_to_string(krb5_context context,krb5_enctype etype,krb5_salttype stype,char ** string)40 krb5_salttype_to_string (krb5_context context,
41 krb5_enctype etype,
42 krb5_salttype stype,
43 char **string)
44 {
45 struct _krb5_encryption_type *e;
46 struct salt_type *st;
47
48 *string = NULL;
49 e = _krb5_find_enctype (etype);
50 if (e == NULL) {
51 krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
52 "encryption type %d not supported",
53 etype);
54 return KRB5_PROG_ETYPE_NOSUPP;
55 }
56 for (st = e->keytype->string_to_key; st && st->type; st++) {
57 if (st->type == stype) {
58 *string = strdup (st->name);
59 if (*string == NULL)
60 return krb5_enomem(context);
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
69 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_string_to_salttype(krb5_context context,krb5_enctype etype,const char * string,krb5_salttype * salttype)70 krb5_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
96 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_pw_salt(krb5_context context,krb5_const_principal principal,krb5_salt * salt)97 krb5_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
125 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_free_salt(krb5_context context,krb5_salt salt)126 krb5_free_salt(krb5_context context,
127 krb5_salt salt)
128 {
129 krb5_data_free(&salt.saltvalue);
130 return 0;
131 }
132
133 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_string_to_key_data(krb5_context context,krb5_enctype enctype,krb5_data password,krb5_principal principal,krb5_keyblock * key)134 krb5_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
151 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_string_to_key(krb5_context context,krb5_enctype enctype,const char * password,krb5_principal principal,krb5_keyblock * key)152 krb5_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
164 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_string_to_key_data_salt(krb5_context context,krb5_enctype enctype,krb5_data password,krb5_salt salt,krb5_keyblock * key)165 krb5_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
183 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_string_to_key_data_salt_opaque(krb5_context context,krb5_enctype enctype,krb5_data password,krb5_salt salt,krb5_data opaque,krb5_keyblock * key)184 krb5_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
215 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_string_to_key_salt(krb5_context context,krb5_enctype enctype,const char * password,krb5_salt salt,krb5_keyblock * key)216 krb5_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
228 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_string_to_key_salt_opaque(krb5_context context,krb5_enctype enctype,const char * password,krb5_salt salt,krb5_data opaque,krb5_keyblock * key)229 krb5_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
244 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_string_to_key_derived(krb5_context context,const void * str,size_t len,krb5_enctype etype,krb5_keyblock * key)245 krb5_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 return krb5_enomem(context);
268 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
269 if(ret) {
270 free(kd.key);
271 return ret;
272 }
273 kd.key->keytype = etype;
274 tmp = malloc (keylen);
275 if(tmp == NULL) {
276 krb5_free_keyblock(context, kd.key);
277 return krb5_enomem(context);
278 }
279 ret = _krb5_n_fold(str, len, tmp, keylen);
280 if (ret) {
281 free(tmp);
282 krb5_enomem(context);
283 return ret;
284 }
285 kd.schedule = NULL;
286 _krb5_DES3_random_to_key(context, kd.key, tmp, keylen);
287 memset(tmp, 0, keylen);
288 free(tmp);
289 ret = _krb5_derive_key(context,
290 et,
291 &kd,
292 "kerberos", /* XXX well known constant */
293 strlen("kerberos"));
294 if (ret) {
295 _krb5_free_key_data(context, &kd, et);
296 return ret;
297 }
298 ret = krb5_copy_keyblock_contents(context, kd.key, key);
299 _krb5_free_key_data(context, &kd, et);
300 return ret;
301 }
302