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34 #include <krb5_locl.h>
36 RCSID("$Id: get_for_creds.c 22504 2008-01-21 15:49:58Z lha $");
38 static krb5_error_code
39 add_addrs(krb5_context context,
49 for (a = ai; a != NULL; a = a->ai_next)
52 tmp = realloc(addr->val, (addr->len + n) * sizeof(*addr->val));
53 if (tmp == NULL && (addr->len + n) != 0) {
54 krb5_set_error_string(context, "malloc: out of memory");
59 for (i = addr->len; i < (addr->len + n); ++i) {
60 addr->val[i].addr_type = 0;
61 krb5_data_zero(&addr->val[i].address);
64 for (a = ai; a != NULL; a = a->ai_next) {
67 ret = krb5_sockaddr2address (context, a->ai_addr, &ad);
69 if (krb5_address_search(context, &ad, addr))
70 krb5_free_address(context, &ad);
74 else if (ret == KRB5_PROG_ATYPE_NOSUPP)
75 krb5_clear_error_string (context);
82 krb5_free_addresses (context, addr);
87 * Forward credentials for client to host hostname , making them
88 * forwardable if forwardable, and returning the blob of data to sent
89 * in out_data. If hostname == NULL, pick it from server.
91 * @param context A kerberos 5 context.
92 * @param auth_context the auth context with the key to encrypt the out_data.
93 * @param hostname the host to forward the tickets too.
94 * @param client the client to delegate from.
95 * @param server the server to delegate the credential too.
96 * @param ccache credential cache to use.
97 * @param forwardable make the forwarded ticket forwabledable.
98 * @param out_data the resulting credential.
100 * @return Return an error code or 0.
102 * @ingroup krb5_credential
105 krb5_error_code KRB5_LIB_FUNCTION
106 krb5_fwd_tgt_creds (krb5_context context,
107 krb5_auth_context auth_context,
108 const char *hostname,
109 krb5_principal client,
110 krb5_principal server,
115 krb5_flags flags = 0;
118 krb5_const_realm client_realm;
120 flags |= KDC_OPT_FORWARDED;
123 flags |= KDC_OPT_FORWARDABLE;
125 if (hostname == NULL &&
126 krb5_principal_get_type(context, server) == KRB5_NT_SRV_HST) {
127 const char *inst = krb5_principal_get_comp_string(context, server, 0);
128 const char *host = krb5_principal_get_comp_string(context, server, 1);
131 strcmp(inst, "host") == 0 &&
133 krb5_principal_get_comp_string(context, server, 2) == NULL)
137 client_realm = krb5_principal_get_realm(context, client);
139 memset (&creds, 0, sizeof(creds));
140 creds.client = client;
142 ret = krb5_build_principal(context,
144 strlen(client_realm),
152 ret = krb5_get_forwarded_creds (context,
163 * Gets tickets forwarded to hostname. If the tickets that are
164 * forwarded are address-less, the forwarded tickets will also be
167 * If the ticket have any address, hostname will be used for figure
168 * out the address to forward the ticket too. This since this might
169 * use DNS, its insecure and also doesn't represent configured all
170 * addresses of the host. For example, the host might have two
171 * adresses, one IPv4 and one IPv6 address where the later is not
172 * published in DNS. This IPv6 address might be used communications
173 * and thus the resulting ticket useless.
175 * @param context A kerberos 5 context.
176 * @param auth_context the auth context with the key to encrypt the out_data.
177 * @param ccache credential cache to use
178 * @param flags the flags to control the resulting ticket flags
179 * @param hostname the host to forward the tickets too.
180 * @param in_creds the in client and server ticket names. The client
181 * and server components forwarded to the remote host.
182 * @param out_data the resulting credential.
184 * @return Return an error code or 0.
186 * @ingroup krb5_credential
189 krb5_error_code KRB5_LIB_FUNCTION
190 krb5_get_forwarded_creds (krb5_context context,
191 krb5_auth_context auth_context,
194 const char *hostname,
195 krb5_creds *in_creds,
199 krb5_creds *out_creds;
200 krb5_addresses addrs, *paddrs;
202 KrbCredInfo *krb_cred_info;
203 EncKrbCredPart enc_krb_cred_part;
207 krb5_kdc_flags kdc_flags;
217 ret = krb5_get_credentials(context, 0, ccache, in_creds, &ticket);
219 if (ticket->addresses.len)
221 krb5_free_creds (context, ticket);
224 krb5_appdefault_boolean(context, NULL,
225 krb5_principal_get_realm(context,
227 "no-addresses", KRB5_ADDRESSLESS_DEFAULT,
234 * If tickets have addresses, get the address of the remote host.
237 if (paddrs != NULL) {
239 ret = getaddrinfo (hostname, NULL, NULL, &ai);
242 krb5_set_error_string(context, "resolving %s: %s",
243 hostname, gai_strerror(ret));
244 return krb5_eai_to_heim_errno(ret, save_errno);
247 ret = add_addrs (context, &addrs, ai);
253 kdc_flags.b = int2KDCOptions(flags);
255 ret = krb5_get_kdc_cred (context,
262 krb5_free_addresses (context, &addrs);
266 memset (&cred, 0, sizeof(cred));
268 cred.msg_type = krb_cred;
269 ALLOC_SEQ(&cred.tickets, 1);
270 if (cred.tickets.val == NULL) {
272 krb5_set_error_string(context, "malloc: out of memory");
275 ret = decode_Ticket(out_creds->ticket.data,
276 out_creds->ticket.length,
277 cred.tickets.val, &len);
281 memset (&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part));
282 ALLOC_SEQ(&enc_krb_cred_part.ticket_info, 1);
283 if (enc_krb_cred_part.ticket_info.val == NULL) {
285 krb5_set_error_string(context, "malloc: out of memory");
289 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
293 krb5_us_timeofday (context, &sec, &usec);
295 ALLOC(enc_krb_cred_part.timestamp, 1);
296 if (enc_krb_cred_part.timestamp == NULL) {
298 krb5_set_error_string(context, "malloc: out of memory");
301 *enc_krb_cred_part.timestamp = sec;
302 ALLOC(enc_krb_cred_part.usec, 1);
303 if (enc_krb_cred_part.usec == NULL) {
305 krb5_set_error_string(context, "malloc: out of memory");
308 *enc_krb_cred_part.usec = usec;
310 enc_krb_cred_part.timestamp = NULL;
311 enc_krb_cred_part.usec = NULL;
314 if (auth_context->local_address && auth_context->local_port && paddrs) {
316 ret = krb5_make_addrport (context,
317 &enc_krb_cred_part.s_address,
318 auth_context->local_address,
319 auth_context->local_port);
324 if (auth_context->remote_address) {
325 if (auth_context->remote_port) {
327 krb5_const_realm srealm;
329 srealm = krb5_principal_get_realm(context, out_creds->server);
330 /* Is this correct, and should we use the paddrs == NULL
331 trick here as well? Having an address-less ticket may
332 indicate that we don't know our own global address, but
333 it does not necessary mean that we don't know the
335 krb5_appdefault_boolean(context, NULL, srealm, "no-addresses",
338 ret = krb5_make_addrport (context,
339 &enc_krb_cred_part.r_address,
340 auth_context->remote_address,
341 auth_context->remote_port);
346 ALLOC(enc_krb_cred_part.r_address, 1);
347 if (enc_krb_cred_part.r_address == NULL) {
349 krb5_set_error_string(context, "malloc: out of memory");
353 ret = krb5_copy_address (context, auth_context->remote_address,
354 enc_krb_cred_part.r_address);
360 /* fill ticket_info.val[0] */
362 enc_krb_cred_part.ticket_info.len = 1;
364 krb_cred_info = enc_krb_cred_part.ticket_info.val;
366 copy_EncryptionKey (&out_creds->session, &krb_cred_info->key);
367 ALLOC(krb_cred_info->prealm, 1);
368 copy_Realm (&out_creds->client->realm, krb_cred_info->prealm);
369 ALLOC(krb_cred_info->pname, 1);
370 copy_PrincipalName(&out_creds->client->name, krb_cred_info->pname);
371 ALLOC(krb_cred_info->flags, 1);
372 *krb_cred_info->flags = out_creds->flags.b;
373 ALLOC(krb_cred_info->authtime, 1);
374 *krb_cred_info->authtime = out_creds->times.authtime;
375 ALLOC(krb_cred_info->starttime, 1);
376 *krb_cred_info->starttime = out_creds->times.starttime;
377 ALLOC(krb_cred_info->endtime, 1);
378 *krb_cred_info->endtime = out_creds->times.endtime;
379 ALLOC(krb_cred_info->renew_till, 1);
380 *krb_cred_info->renew_till = out_creds->times.renew_till;
381 ALLOC(krb_cred_info->srealm, 1);
382 copy_Realm (&out_creds->server->realm, krb_cred_info->srealm);
383 ALLOC(krb_cred_info->sname, 1);
384 copy_PrincipalName (&out_creds->server->name, krb_cred_info->sname);
385 ALLOC(krb_cred_info->caddr, 1);
386 copy_HostAddresses (&out_creds->addresses, krb_cred_info->caddr);
388 krb5_free_creds (context, out_creds);
390 /* encode EncKrbCredPart */
392 ASN1_MALLOC_ENCODE(EncKrbCredPart, buf, buf_size,
393 &enc_krb_cred_part, &len, ret);
394 free_EncKrbCredPart (&enc_krb_cred_part);
396 free_KRB_CRED(&cred);
400 krb5_abortx(context, "internal error in ASN.1 encoder");
403 * Some older of the MIT gssapi library used clear-text tickets
404 * (warped inside AP-REQ encryption), use the krb5_auth_context
405 * flag KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED to support those
406 * tickets. The session key is used otherwise to encrypt the
410 if (auth_context->flags & KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED) {
411 cred.enc_part.etype = ENCTYPE_NULL;
412 cred.enc_part.kvno = NULL;
413 cred.enc_part.cipher.data = buf;
414 cred.enc_part.cipher.length = buf_size;
417 * Here older versions then 0.7.2 of Heimdal used the local or
418 * remote subkey. That is wrong, the session key should be
419 * used. Heimdal 0.7.2 and newer have code to try both in the
423 ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto);
426 free_KRB_CRED(&cred);
429 ret = krb5_encrypt_EncryptedData (context,
437 krb5_crypto_destroy(context, crypto);
439 free_KRB_CRED(&cred);
444 ASN1_MALLOC_ENCODE(KRB_CRED, buf, buf_size, &cred, &len, ret);
445 free_KRB_CRED (&cred);
449 krb5_abortx(context, "internal error in ASN.1 encoder");
450 out_data->length = len;
451 out_data->data = buf;
454 free_EncKrbCredPart(&enc_krb_cred_part);
456 free_KRB_CRED(&cred);
458 krb5_free_creds (context, out_creds);