2 * Copyright (c) 1997 - 2001, 2003 - 2004 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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36 RCSID("$Id: keys.c,v 1.3 2005/03/17 00:42:05 lha Exp $");
39 * free all the memory used by (len, keys)
43 hdb_free_keys (krb5_context context, int len, Key *keys)
47 for (i = 0; i < len; i++) {
50 if (keys[i].salt != NULL) {
51 free_Salt(keys[i].salt);
55 krb5_free_keyblock_contents(context, &keys[i].key);
61 * for each entry in `default_keys' try to parse it as a sequence
62 * of etype:salttype:salt, syntax of this if something like:
63 * [(des|des3|etype):](pw-salt|afs3)[:string], if etype is omitted it
64 * means all etypes, and if string is omitted is means the default
65 * string (for that principal). Additional special values:
68 * afs or afs3 == des:afs3-salt
71 /* the 3 DES types must be first */
72 static const krb5_enctype all_etypes[] = {
76 ETYPE_AES256_CTS_HMAC_SHA1_96,
77 ETYPE_ARCFOUR_HMAC_MD5,
81 static krb5_error_code
82 parse_key_set(krb5_context context, const char *key,
83 krb5_enctype **ret_enctypes, size_t *ret_num_enctypes,
84 krb5_salt *salt, krb5_principal principal)
89 int i, num_enctypes = 0;
91 const krb5_enctype *enctypes = NULL;
97 *ret_num_enctypes = 0;
99 /* split p in a list of :-separated strings */
100 for(num_buf = 0; num_buf < 3; num_buf++)
101 if(strsep_copy(&p, ":", buf[num_buf], sizeof(buf[num_buf])) == -1)
104 salt->saltvalue.data = NULL;
105 salt->saltvalue.length = 0;
107 for(i = 0; i < num_buf; i++) {
108 if(enctypes == NULL) {
109 /* this might be a etype specifier */
110 /* XXX there should be a string_to_etypes handling
111 special cases like `des' and `all' */
112 if(strcmp(buf[i], "des") == 0) {
113 enctypes = all_etypes;
116 } else if(strcmp(buf[i], "des3") == 0) {
117 e = ETYPE_DES3_CBC_SHA1;
122 ret = krb5_string_to_enctype(context, buf[i], &e);
131 if(salt->salttype == 0) {
132 /* interpret string as a salt specifier, if no etype
133 is set, this sets default values */
134 /* XXX should perhaps use string_to_salttype, but that
136 if(strcmp(buf[i], "pw-salt") == 0) {
137 if(enctypes == NULL) {
138 enctypes = all_etypes;
139 num_enctypes = sizeof(all_etypes)/sizeof(all_etypes[0]);
141 salt->salttype = KRB5_PW_SALT;
142 } else if(strcmp(buf[i], "afs3-salt") == 0) {
143 if(enctypes == NULL) {
144 enctypes = all_etypes;
147 salt->salttype = KRB5_AFS3_SALT;
150 /* if there is a final string, use it as the string to
151 salt with, this is mostly useful with null salt for
152 v4 compat, and a cell name for afs compat */
153 salt->saltvalue.data = strdup(buf[i]);
154 if (salt->saltvalue.data == NULL) {
155 krb5_set_error_string(context, "malloc out of memory");
158 salt->saltvalue.length = strlen(buf[i]);
162 if(enctypes == NULL || salt->salttype == 0) {
163 krb5_set_error_string(context, "bad value for default_keys `%s'", key);
167 /* if no salt was specified make up default salt */
168 if(salt->saltvalue.data == NULL) {
169 if(salt->salttype == KRB5_PW_SALT)
170 ret = krb5_get_pw_salt(context, principal, salt);
171 else if(salt->salttype == KRB5_AFS3_SALT) {
172 krb5_realm *realm = krb5_princ_realm(context, principal);
173 salt->saltvalue.data = strdup(*realm);
174 if(salt->saltvalue.data == NULL) {
175 krb5_set_error_string(context, "out of memory while "
176 "parsing salt specifiers");
179 strlwr(salt->saltvalue.data);
180 salt->saltvalue.length = strlen(*realm);
184 *ret_enctypes = malloc(sizeof(enctypes[0]) * num_enctypes);
185 if (*ret_enctypes == NULL) {
186 krb5_free_salt(context, *salt);
187 krb5_set_error_string(context, "out of memory");
190 memcpy(*ret_enctypes, enctypes, sizeof(enctypes[0]) * num_enctypes);
191 *ret_num_enctypes = num_enctypes;
196 static krb5_error_code
197 add_enctype_to_key_set(Key **key_set, size_t *nkeyset,
198 krb5_enctype enctype, krb5_salt *salt)
203 memset(&key, 0, sizeof(key));
205 tmp = realloc(*key_set, (*nkeyset + 1) * sizeof((*key_set)[0]));
211 key.key.keytype = enctype;
212 key.key.keyvalue.length = 0;
213 key.key.keyvalue.data = NULL;
216 key.salt = malloc(sizeof(*key.salt));
217 if (key.salt == NULL) {
222 key.salt->type = salt->salttype;
223 krb5_data_zero (&key.salt->salt);
225 ret = krb5_data_copy(&key.salt->salt,
226 salt->saltvalue.data,
227 salt->saltvalue.length);
235 (*key_set)[*nkeyset] = key;
244 * Generate the `key_set' from the [kadmin]default_keys statement. If
245 * `no_salt' is set, salt is not important (and will not be set) since
246 * its random keys that is going to be created.
250 hdb_generate_key_set(krb5_context context, krb5_principal principal,
251 Key **ret_key_set, size_t *nkeyset, int no_salt)
257 char *default_keytypes[] = {
259 "aes256-cts-hmac-sha1-96:pw-salt",
260 "des3-cbc-sha1:pw-salt",
261 "arcfour-hmac-md5:pw-salt",
265 ktypes = krb5_config_get_strings(context, NULL, "kadmin",
266 "default_keys", NULL);
268 ktypes = default_keytypes;
273 *ret_key_set = key_set = NULL;
278 for(kp = ktypes; kp && *kp; kp++) {
281 krb5_enctype *enctypes;
286 if(strcmp(p, "v5") == 0)
288 else if(strcmp(p, "v4") == 0)
290 else if(strcmp(p, "afs") == 0 || strcmp(p, "afs3") == 0)
292 else if (strcmp(p, "arcfour-hmac-md5") == 0)
293 p = "arcfour-hmac-md5:pw-salt";
295 memset(&salt, 0, sizeof(salt));
297 ret = parse_key_set(context, p,
298 &enctypes, &num_enctypes, &salt, principal);
300 krb5_warnx(context, "bad value for default_keys `%s'", *kp);
304 for (i = 0; i < num_enctypes; i++) {
305 /* find duplicates */
306 for (j = 0; j < *nkeyset; j++) {
310 if (k->key.keytype == enctypes[i]) {
313 if (k->salt == NULL && salt.salttype == KRB5_PW_SALT)
315 if (k->salt->type == salt.salttype &&
316 k->salt->salt.length == salt.saltvalue.length &&
317 memcmp(k->salt->salt.data, salt.saltvalue.data,
318 salt.saltvalue.length) == 0)
322 /* not a duplicate, lets add it */
324 ret = add_enctype_to_key_set(&key_set, nkeyset, enctypes[i],
325 no_salt ? NULL : &salt);
328 krb5_free_salt(context, salt);
334 krb5_free_salt(context, salt);
339 krb5_warn(context, ret,
340 "failed to parse the [kadmin]default_keys values");
342 for (i = 0; i < *nkeyset; i++)
343 free_Key(&key_set[i]);
345 } else if (*nkeyset == 0) {
347 "failed to parse any of the [kadmin]default_keys values");
348 ret = EINVAL; /* XXX */
351 *ret_key_set = key_set;
358 hdb_generate_key_set_password(krb5_context context,
359 krb5_principal principal,
360 const char *password,
361 Key **keys, size_t *num_keys)
366 ret = hdb_generate_key_set(context, principal,
371 for (i = 0; i < (*num_keys); i++) {
374 salt.salttype = (*keys)[i].salt->type;
375 salt.saltvalue.length = (*keys)[i].salt->salt.length;
376 salt.saltvalue.data = (*keys)[i].salt->salt.data;
378 ret = krb5_string_to_key_salt (context,
379 (*keys)[i].key.keytype,
389 hdb_free_keys (context, *num_keys, *keys);