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3 * (Royal Institute of Technology, Stockholm, Sweden).
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36 RCSID("$Id: keys.c 22071 2007-11-14 20:04:50Z lha $");
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 && num_buf > 1) {
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;
115 } else if(strcmp(buf[i], "des3") == 0) {
116 e = ETYPE_DES3_CBC_SHA1;
120 ret = krb5_string_to_enctype(context, buf[i], &e);
129 if(salt->salttype == 0) {
130 /* interpret string as a salt specifier, if no etype
131 is set, this sets default values */
132 /* XXX should perhaps use string_to_salttype, but that
134 if(strcmp(buf[i], "pw-salt") == 0) {
135 if(enctypes == NULL) {
136 enctypes = all_etypes;
137 num_enctypes = sizeof(all_etypes)/sizeof(all_etypes[0]);
139 salt->salttype = KRB5_PW_SALT;
140 } else if(strcmp(buf[i], "afs3-salt") == 0) {
141 if(enctypes == NULL) {
142 enctypes = all_etypes;
145 salt->salttype = KRB5_AFS3_SALT;
151 /* if there is a final string, use it as the string to
152 salt with, this is mostly useful with null salt for
153 v4 compat, and a cell name for afs compat */
154 salt->saltvalue.data = strdup(buf[i]);
155 if (salt->saltvalue.data == NULL) {
156 krb5_set_error_string(context, "out of memory");
159 salt->saltvalue.length = strlen(buf[i]);
163 if(enctypes == NULL || salt->salttype == 0) {
164 krb5_set_error_string(context, "bad value for default_keys `%s'", key);
168 /* if no salt was specified make up default salt */
169 if(salt->saltvalue.data == NULL) {
170 if(salt->salttype == KRB5_PW_SALT)
171 ret = krb5_get_pw_salt(context, principal, salt);
172 else if(salt->salttype == KRB5_AFS3_SALT) {
173 krb5_realm *realm = krb5_princ_realm(context, principal);
174 salt->saltvalue.data = strdup(*realm);
175 if(salt->saltvalue.data == NULL) {
176 krb5_set_error_string(context, "out of memory while "
177 "parsing salt specifiers");
180 strlwr(salt->saltvalue.data);
181 salt->saltvalue.length = strlen(*realm);
185 *ret_enctypes = malloc(sizeof(enctypes[0]) * num_enctypes);
186 if (*ret_enctypes == NULL) {
187 krb5_free_salt(context, *salt);
188 krb5_set_error_string(context, "out of memory");
191 memcpy(*ret_enctypes, enctypes, sizeof(enctypes[0]) * num_enctypes);
192 *ret_num_enctypes = num_enctypes;
197 static krb5_error_code
198 add_enctype_to_key_set(Key **key_set, size_t *nkeyset,
199 krb5_enctype enctype, krb5_salt *salt)
204 memset(&key, 0, sizeof(key));
206 tmp = realloc(*key_set, (*nkeyset + 1) * sizeof((*key_set)[0]));
212 key.key.keytype = enctype;
213 key.key.keyvalue.length = 0;
214 key.key.keyvalue.data = NULL;
217 key.salt = malloc(sizeof(*key.salt));
218 if (key.salt == NULL) {
223 key.salt->type = salt->salttype;
224 krb5_data_zero (&key.salt->salt);
226 ret = krb5_data_copy(&key.salt->salt,
227 salt->saltvalue.data,
228 salt->saltvalue.length);
236 (*key_set)[*nkeyset] = key;
245 * Generate the `key_set' from the [kadmin]default_keys statement. If
246 * `no_salt' is set, salt is not important (and will not be set) since
247 * it's random keys that is going to be created.
251 hdb_generate_key_set(krb5_context context, krb5_principal principal,
252 Key **ret_key_set, size_t *nkeyset, int no_salt)
258 char *default_keytypes[] = {
260 "aes256-cts-hmac-sha1-96:pw-salt",
261 "des3-cbc-sha1:pw-salt",
262 "arcfour-hmac-md5:pw-salt",
266 ktypes = krb5_config_get_strings(context, NULL, "kadmin",
267 "default_keys", NULL);
269 ktypes = default_keytypes;
274 *ret_key_set = key_set = NULL;
279 for(kp = ktypes; kp && *kp; kp++) {
282 krb5_enctype *enctypes;
287 if(strcmp(p, "v5") == 0)
289 else if(strcmp(p, "v4") == 0)
291 else if(strcmp(p, "afs") == 0 || strcmp(p, "afs3") == 0)
293 else if (strcmp(p, "arcfour-hmac-md5") == 0)
294 p = "arcfour-hmac-md5:pw-salt";
296 memset(&salt, 0, sizeof(salt));
298 ret = parse_key_set(context, p,
299 &enctypes, &num_enctypes, &salt, principal);
301 krb5_warn(context, ret, "bad value for default_keys `%s'", *kp);
306 for (i = 0; i < num_enctypes; i++) {
307 /* find duplicates */
308 for (j = 0; j < *nkeyset; j++) {
312 if (k->key.keytype == enctypes[i]) {
315 if (k->salt == NULL && salt.salttype == KRB5_PW_SALT)
317 if (k->salt->type == salt.salttype &&
318 k->salt->salt.length == salt.saltvalue.length &&
319 memcmp(k->salt->salt.data, salt.saltvalue.data,
320 salt.saltvalue.length) == 0)
324 /* not a duplicate, lets add it */
326 ret = add_enctype_to_key_set(&key_set, nkeyset, enctypes[i],
327 no_salt ? NULL : &salt);
330 krb5_free_salt(context, salt);
336 krb5_free_salt(context, salt);
339 *ret_key_set = key_set;
342 if (ktypes != default_keytypes)
343 krb5_config_free_strings(ktypes);
346 krb5_warn(context, ret,
347 "failed to parse the [kadmin]default_keys values");
349 for (i = 0; i < *nkeyset; i++)
350 free_Key(&key_set[i]);
352 } else if (*nkeyset == 0) {
354 "failed to parse any of the [kadmin]default_keys values");
355 ret = EINVAL; /* XXX */
363 hdb_generate_key_set_password(krb5_context context,
364 krb5_principal principal,
365 const char *password,
366 Key **keys, size_t *num_keys)
371 ret = hdb_generate_key_set(context, principal,
376 for (i = 0; i < (*num_keys); i++) {
379 salt.salttype = (*keys)[i].salt->type;
380 salt.saltvalue.length = (*keys)[i].salt->salt.length;
381 salt.saltvalue.data = (*keys)[i].salt->salt.data;
383 ret = krb5_string_to_key_salt (context,
384 (*keys)[i].key.keytype,
394 hdb_free_keys (context, *num_keys, *keys);