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36 RCSID("$Id: 524.c 18270 2006-10-06 17:06:30Z lha $");
38 #include <krb5-v4compat.h>
41 * fetch the server from `t', returning the name in malloced memory in
42 * `spn' and the entry itself in `server'
45 static krb5_error_code
46 fetch_server (krb5_context context,
47 krb5_kdc_configuration *config,
50 hdb_entry_ex **server,
54 krb5_principal sprinc;
56 ret = _krb5_principalname2krb5_principal(context, &sprinc,
59 kdc_log(context, config, 0, "_krb5_principalname2krb5_principal: %s",
60 krb5_get_err_text(context, ret));
63 ret = krb5_unparse_name(context, sprinc, spn);
65 krb5_free_principal(context, sprinc);
66 kdc_log(context, config, 0, "krb5_unparse_name: %s",
67 krb5_get_err_text(context, ret));
70 ret = _kdc_db_fetch(context, config, sprinc, HDB_F_GET_SERVER,
72 krb5_free_principal(context, sprinc);
74 kdc_log(context, config, 0,
75 "Request to convert ticket from %s for unknown principal %s: %s",
76 from, *spn, krb5_get_err_text(context, ret));
77 if (ret == HDB_ERR_NOENTRY)
78 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
84 static krb5_error_code
85 log_524 (krb5_context context,
86 krb5_kdc_configuration *config,
87 const EncTicketPart *et,
91 krb5_principal client;
95 ret = _krb5_principalname2krb5_principal(context, &client,
96 et->cname, et->crealm);
98 kdc_log(context, config, 0, "_krb5_principalname2krb5_principal: %s",
99 krb5_get_err_text (context, ret));
102 ret = krb5_unparse_name(context, client, &cpn);
104 krb5_free_principal(context, client);
105 kdc_log(context, config, 0, "krb5_unparse_name: %s",
106 krb5_get_err_text (context, ret));
109 kdc_log(context, config, 1, "524-REQ %s from %s for %s", cpn, from, spn);
111 krb5_free_principal(context, client);
115 static krb5_error_code
116 verify_flags (krb5_context context,
117 krb5_kdc_configuration *config,
118 const EncTicketPart *et,
121 if(et->endtime < kdc_time){
122 kdc_log(context, config, 0, "Ticket expired (%s)", spn);
123 return KRB5KRB_AP_ERR_TKT_EXPIRED;
125 if(et->flags.invalid){
126 kdc_log(context, config, 0, "Ticket not valid (%s)", spn);
127 return KRB5KRB_AP_ERR_TKT_NYV;
133 * set the `et->caddr' to the most appropriate address to use, where
134 * `addr' is the address the request was received from.
137 static krb5_error_code
138 set_address (krb5_context context,
139 krb5_kdc_configuration *config,
141 struct sockaddr *addr,
145 krb5_address *v4_addr;
147 v4_addr = malloc (sizeof(*v4_addr));
151 ret = krb5_sockaddr2address(context, addr, v4_addr);
154 kdc_log(context, config, 0, "Failed to convert address (%s)", from);
158 if (et->caddr && !krb5_address_search (context, v4_addr, et->caddr)) {
159 kdc_log(context, config, 0, "Incorrect network address (%s)", from);
160 krb5_free_address(context, v4_addr);
162 return KRB5KRB_AP_ERR_BADADDR;
164 if(v4_addr->addr_type == KRB5_ADDRESS_INET) {
165 /* we need to collapse the addresses in the ticket to a
166 single address; best guess is to use the address the
167 connection came from */
169 if (et->caddr != NULL) {
170 free_HostAddresses(et->caddr);
172 et->caddr = malloc (sizeof (*et->caddr));
173 if (et->caddr == NULL) {
174 krb5_free_address(context, v4_addr);
179 et->caddr->val = v4_addr;
182 krb5_free_address(context, v4_addr);
189 static krb5_error_code
190 encrypt_v4_ticket(krb5_context context,
191 krb5_kdc_configuration *config,
195 EncryptedData *reply)
199 ret = krb5_crypto_init(context, skey, ETYPE_DES_PCBC_NONE, &crypto);
202 kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
203 krb5_get_err_text(context, ret));
207 ret = krb5_encrypt_EncryptedData(context,
214 krb5_crypto_destroy(context, crypto);
216 kdc_log(context, config, 0, "Failed to encrypt data: %s",
217 krb5_get_err_text(context, ret));
223 static krb5_error_code
224 encode_524_response(krb5_context context,
225 krb5_kdc_configuration *config,
226 const char *spn, const EncTicketPart et,
227 const Ticket *t, hdb_entry_ex *server,
228 EncryptedData *ticket, int *kvno)
234 use_2b = krb5_config_get_bool(context, NULL, "kdc", "use_2b", spn, NULL);
236 ASN1_MALLOC_ENCODE(EncryptedData,
237 ticket->cipher.data, ticket->cipher.length,
238 &t->enc_part, &len, ret);
241 kdc_log(context, config, 0,
242 "Failed to encode v4 (2b) ticket (%s)", spn);
248 *kvno = 213; /* 2b's use this magic kvno */
250 unsigned char buf[MAX_KTXT_LEN + 4 * 4];
253 if (!config->enable_v4_cross_realm && strcmp (et.crealm, t->realm) != 0) {
254 kdc_log(context, config, 0, "524 cross-realm %s -> %s disabled", et.crealm,
256 return KRB5KDC_ERR_POLICY;
259 ret = _kdc_encode_v4_ticket(context, config,
260 buf + sizeof(buf) - 1, sizeof(buf),
261 &et, &t->sname, &len);
263 kdc_log(context, config, 0,
264 "Failed to encode v4 ticket (%s)", spn);
267 ret = _kdc_get_des_key(context, server, TRUE, FALSE, &skey);
269 kdc_log(context, config, 0,
270 "no suitable DES key for server (%s)", spn);
273 ret = encrypt_v4_ticket(context, config, buf + sizeof(buf) - len, len,
276 kdc_log(context, config, 0,
277 "Failed to encrypt v4 ticket (%s)", spn);
280 *kvno = server->entry.kvno;
287 * process a 5->4 request, based on `t', and received `from, addr',
288 * returning the reply in `reply'
292 _kdc_do_524(krb5_context context,
293 krb5_kdc_configuration *config,
294 const Ticket *t, krb5_data *reply,
295 const char *from, struct sockaddr *addr)
297 krb5_error_code ret = 0;
299 hdb_entry_ex *server = NULL;
303 EncryptedData ticket;
306 unsigned char buf[MAX_KTXT_LEN + 4 * 4];
310 if(!config->enable_524) {
311 ret = KRB5KDC_ERR_POLICY;
312 kdc_log(context, config, 0,
313 "Rejected ticket conversion request from %s", from);
317 ret = fetch_server (context, config, t, &spn, &server, from);
322 ret = hdb_enctype2key(context, &server->entry, t->enc_part.etype, &skey);
324 kdc_log(context, config, 0,
325 "No suitable key found for server (%s) from %s", spn, from);
328 ret = krb5_crypto_init(context, &skey->key, 0, &crypto);
330 kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
331 krb5_get_err_text(context, ret));
334 ret = krb5_decrypt_EncryptedData (context,
339 krb5_crypto_destroy(context, crypto);
341 kdc_log(context, config, 0,
342 "Failed to decrypt ticket from %s for %s", from, spn);
345 ret = krb5_decode_EncTicketPart(context, et_data.data, et_data.length,
347 krb5_data_free(&et_data);
349 kdc_log(context, config, 0,
350 "Failed to decode ticket from %s for %s", from, spn);
354 ret = log_524 (context, config, &et, from, spn);
356 free_EncTicketPart(&et);
360 ret = verify_flags (context, config, &et, spn);
362 free_EncTicketPart(&et);
366 ret = set_address (context, config, &et, addr, from);
368 free_EncTicketPart(&et);
372 ret = encode_524_response(context, config, spn, et, t,
373 server, &ticket, &kvno);
374 free_EncTicketPart(&et);
378 memset(buf, 0, sizeof(buf));
379 sp = krb5_storage_from_mem(buf, sizeof(buf));
381 krb5_store_int32(sp, ret);
383 krb5_store_int32(sp, kvno);
384 krb5_store_data(sp, ticket.cipher);
385 /* Aargh! This is coded as a KTEXT_ST. */
386 krb5_storage_seek(sp, MAX_KTXT_LEN - ticket.cipher.length, SEEK_CUR);
387 krb5_store_int32(sp, 0); /* mbz */
388 free_EncryptedData(&ticket);
390 ret = krb5_storage_to_data(sp, reply);
391 reply->length = krb5_storage_seek(sp, 0, SEEK_CUR);
392 krb5_storage_free(sp);
394 krb5_data_zero(reply);
398 _kdc_free_ent (context, server);