1 /* 2 * Copyright (c) 1997 - 2002 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <krb5_locl.h> 35 36 RCSID("$Id: get_for_creds.c,v 1.34.4.1 2004/01/09 00:51:55 lha Exp $"); 37 38 static krb5_error_code 39 add_addrs(krb5_context context, 40 krb5_addresses *addr, 41 struct addrinfo *ai) 42 { 43 krb5_error_code ret; 44 unsigned n, i; 45 void *tmp; 46 struct addrinfo *a; 47 48 n = 0; 49 for (a = ai; a != NULL; a = a->ai_next) 50 ++n; 51 52 tmp = realloc(addr->val, (addr->len + n) * sizeof(*addr->val)); 53 if (tmp == NULL) { 54 krb5_set_error_string(context, "malloc: out of memory"); 55 ret = ENOMEM; 56 goto fail; 57 } 58 addr->val = tmp; 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); 62 } 63 i = addr->len; 64 for (a = ai; a != NULL; a = a->ai_next) { 65 krb5_address ad; 66 67 ret = krb5_sockaddr2address (context, a->ai_addr, &ad); 68 if (ret == 0) { 69 if (krb5_address_search(context, &ad, addr)) 70 krb5_free_address(context, &ad); 71 else 72 addr->val[i++] = ad; 73 } 74 else if (ret == KRB5_PROG_ATYPE_NOSUPP) 75 krb5_clear_error_string (context); 76 else 77 goto fail; 78 addr->len = i; 79 } 80 return 0; 81 fail: 82 krb5_free_addresses (context, addr); 83 return ret; 84 } 85 86 /* 87 * Forward credentials for `client' to host `hostname`, 88 * making them forwardable if `forwardable', and returning the 89 * blob of data to sent in `out_data'. 90 * If hostname == NULL, pick it from `server' 91 */ 92 93 krb5_error_code 94 krb5_fwd_tgt_creds (krb5_context context, 95 krb5_auth_context auth_context, 96 const char *hostname, 97 krb5_principal client, 98 krb5_principal server, 99 krb5_ccache ccache, 100 int forwardable, 101 krb5_data *out_data) 102 { 103 krb5_flags flags = 0; 104 krb5_creds creds; 105 krb5_error_code ret; 106 krb5_const_realm client_realm; 107 108 flags |= KDC_OPT_FORWARDED; 109 110 if (forwardable) 111 flags |= KDC_OPT_FORWARDABLE; 112 113 if (hostname == NULL && 114 krb5_principal_get_type(context, server) == KRB5_NT_SRV_HST) { 115 const char *inst = krb5_principal_get_comp_string(context, server, 0); 116 const char *host = krb5_principal_get_comp_string(context, server, 1); 117 118 if (inst != NULL && 119 strcmp(inst, "host") == 0 && 120 host != NULL && 121 krb5_principal_get_comp_string(context, server, 2) == NULL) 122 hostname = host; 123 } 124 125 client_realm = krb5_principal_get_realm(context, client); 126 127 memset (&creds, 0, sizeof(creds)); 128 creds.client = client; 129 130 ret = krb5_build_principal(context, 131 &creds.server, 132 strlen(client_realm), 133 client_realm, 134 KRB5_TGS_NAME, 135 client_realm, 136 NULL); 137 if (ret) 138 return ret; 139 140 ret = krb5_get_forwarded_creds (context, 141 auth_context, 142 ccache, 143 flags, 144 hostname, 145 &creds, 146 out_data); 147 return ret; 148 } 149 150 /* 151 * 152 */ 153 154 krb5_error_code 155 krb5_get_forwarded_creds (krb5_context context, 156 krb5_auth_context auth_context, 157 krb5_ccache ccache, 158 krb5_flags flags, 159 const char *hostname, 160 krb5_creds *in_creds, 161 krb5_data *out_data) 162 { 163 krb5_error_code ret; 164 krb5_creds *out_creds; 165 krb5_addresses addrs, *paddrs; 166 KRB_CRED cred; 167 KrbCredInfo *krb_cred_info; 168 EncKrbCredPart enc_krb_cred_part; 169 size_t len; 170 unsigned char *buf; 171 size_t buf_size; 172 krb5_kdc_flags kdc_flags; 173 krb5_crypto crypto; 174 struct addrinfo *ai; 175 int save_errno; 176 krb5_keyblock *key; 177 krb5_creds *ticket; 178 char *realm; 179 180 if (in_creds->client && in_creds->client->realm) 181 realm = in_creds->client->realm; 182 else 183 realm = in_creds->server->realm; 184 185 addrs.len = 0; 186 addrs.val = NULL; 187 paddrs = &addrs; 188 189 /* 190 * If tickets are address-less, forward address-less tickets. 191 */ 192 193 ret = _krb5_get_krbtgt (context, 194 ccache, 195 realm, 196 &ticket); 197 if(ret == 0) { 198 if (ticket->addresses.len == 0) 199 paddrs = NULL; 200 krb5_free_creds (context, ticket); 201 } 202 203 if (paddrs != NULL) { 204 205 ret = getaddrinfo (hostname, NULL, NULL, &ai); 206 if (ret) { 207 save_errno = errno; 208 krb5_set_error_string(context, "resolving %s: %s", 209 hostname, gai_strerror(ret)); 210 return krb5_eai_to_heim_errno(ret, save_errno); 211 } 212 213 ret = add_addrs (context, &addrs, ai); 214 freeaddrinfo (ai); 215 if (ret) 216 return ret; 217 } 218 219 kdc_flags.i = flags; 220 221 ret = krb5_get_kdc_cred (context, 222 ccache, 223 kdc_flags, 224 paddrs, 225 NULL, 226 in_creds, 227 &out_creds); 228 krb5_free_addresses (context, &addrs); 229 if (ret) { 230 return ret; 231 } 232 233 memset (&cred, 0, sizeof(cred)); 234 cred.pvno = 5; 235 cred.msg_type = krb_cred; 236 ALLOC_SEQ(&cred.tickets, 1); 237 if (cred.tickets.val == NULL) { 238 ret = ENOMEM; 239 krb5_set_error_string(context, "malloc: out of memory"); 240 goto out2; 241 } 242 ret = decode_Ticket(out_creds->ticket.data, 243 out_creds->ticket.length, 244 cred.tickets.val, &len); 245 if (ret) 246 goto out3; 247 248 memset (&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part)); 249 ALLOC_SEQ(&enc_krb_cred_part.ticket_info, 1); 250 if (enc_krb_cred_part.ticket_info.val == NULL) { 251 ret = ENOMEM; 252 krb5_set_error_string(context, "malloc: out of memory"); 253 goto out4; 254 } 255 256 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 257 int32_t sec, usec; 258 259 krb5_us_timeofday (context, &sec, &usec); 260 261 ALLOC(enc_krb_cred_part.timestamp, 1); 262 if (enc_krb_cred_part.timestamp == NULL) { 263 ret = ENOMEM; 264 krb5_set_error_string(context, "malloc: out of memory"); 265 goto out4; 266 } 267 *enc_krb_cred_part.timestamp = sec; 268 ALLOC(enc_krb_cred_part.usec, 1); 269 if (enc_krb_cred_part.usec == NULL) { 270 ret = ENOMEM; 271 krb5_set_error_string(context, "malloc: out of memory"); 272 goto out4; 273 } 274 *enc_krb_cred_part.usec = usec; 275 } else { 276 enc_krb_cred_part.timestamp = NULL; 277 enc_krb_cred_part.usec = NULL; 278 } 279 280 if (auth_context->local_address && auth_context->local_port) { 281 krb5_boolean noaddr; 282 krb5_const_realm realm; 283 284 realm = krb5_principal_get_realm(context, out_creds->server); 285 krb5_appdefault_boolean(context, NULL, realm, "no-addresses", FALSE, 286 &noaddr); 287 if (!noaddr) { 288 ret = krb5_make_addrport (context, 289 &enc_krb_cred_part.s_address, 290 auth_context->local_address, 291 auth_context->local_port); 292 if (ret) 293 goto out4; 294 } 295 } 296 297 if (auth_context->remote_address) { 298 if (auth_context->remote_port) { 299 krb5_boolean noaddr; 300 krb5_const_realm realm; 301 302 realm = krb5_principal_get_realm(context, out_creds->server); 303 krb5_appdefault_boolean(context, NULL, realm, "no-addresses", 304 FALSE, &noaddr); 305 if (!noaddr) { 306 ret = krb5_make_addrport (context, 307 &enc_krb_cred_part.r_address, 308 auth_context->remote_address, 309 auth_context->remote_port); 310 if (ret) 311 goto out4; 312 } 313 } else { 314 ALLOC(enc_krb_cred_part.r_address, 1); 315 if (enc_krb_cred_part.r_address == NULL) { 316 ret = ENOMEM; 317 krb5_set_error_string(context, "malloc: out of memory"); 318 goto out4; 319 } 320 321 ret = krb5_copy_address (context, auth_context->remote_address, 322 enc_krb_cred_part.r_address); 323 if (ret) 324 goto out4; 325 } 326 } 327 328 /* fill ticket_info.val[0] */ 329 330 enc_krb_cred_part.ticket_info.len = 1; 331 332 krb_cred_info = enc_krb_cred_part.ticket_info.val; 333 334 copy_EncryptionKey (&out_creds->session, &krb_cred_info->key); 335 ALLOC(krb_cred_info->prealm, 1); 336 copy_Realm (&out_creds->client->realm, krb_cred_info->prealm); 337 ALLOC(krb_cred_info->pname, 1); 338 copy_PrincipalName(&out_creds->client->name, krb_cred_info->pname); 339 ALLOC(krb_cred_info->flags, 1); 340 *krb_cred_info->flags = out_creds->flags.b; 341 ALLOC(krb_cred_info->authtime, 1); 342 *krb_cred_info->authtime = out_creds->times.authtime; 343 ALLOC(krb_cred_info->starttime, 1); 344 *krb_cred_info->starttime = out_creds->times.starttime; 345 ALLOC(krb_cred_info->endtime, 1); 346 *krb_cred_info->endtime = out_creds->times.endtime; 347 ALLOC(krb_cred_info->renew_till, 1); 348 *krb_cred_info->renew_till = out_creds->times.renew_till; 349 ALLOC(krb_cred_info->srealm, 1); 350 copy_Realm (&out_creds->server->realm, krb_cred_info->srealm); 351 ALLOC(krb_cred_info->sname, 1); 352 copy_PrincipalName (&out_creds->server->name, krb_cred_info->sname); 353 ALLOC(krb_cred_info->caddr, 1); 354 copy_HostAddresses (&out_creds->addresses, krb_cred_info->caddr); 355 356 krb5_free_creds (context, out_creds); 357 358 /* encode EncKrbCredPart */ 359 360 ASN1_MALLOC_ENCODE(EncKrbCredPart, buf, buf_size, 361 &enc_krb_cred_part, &len, ret); 362 free_EncKrbCredPart (&enc_krb_cred_part); 363 if (ret) { 364 free_KRB_CRED(&cred); 365 return ret; 366 } 367 if(buf_size != len) 368 krb5_abortx(context, "internal error in ASN.1 encoder"); 369 370 if (auth_context->local_subkey) 371 key = auth_context->local_subkey; 372 else if (auth_context->remote_subkey) 373 key = auth_context->remote_subkey; 374 else 375 key = auth_context->keyblock; 376 377 ret = krb5_crypto_init(context, key, 0, &crypto); 378 if (ret) { 379 free(buf); 380 free_KRB_CRED(&cred); 381 return ret; 382 } 383 ret = krb5_encrypt_EncryptedData (context, 384 crypto, 385 KRB5_KU_KRB_CRED, 386 buf, 387 len, 388 0, 389 &cred.enc_part); 390 free(buf); 391 krb5_crypto_destroy(context, crypto); 392 if (ret) { 393 free_KRB_CRED(&cred); 394 return ret; 395 } 396 397 ASN1_MALLOC_ENCODE(KRB_CRED, buf, buf_size, &cred, &len, ret); 398 free_KRB_CRED (&cred); 399 if (ret) 400 return ret; 401 if(buf_size != len) 402 krb5_abortx(context, "internal error in ASN.1 encoder"); 403 out_data->length = len; 404 out_data->data = buf; 405 return 0; 406 out4: 407 free_EncKrbCredPart(&enc_krb_cred_part); 408 out3: 409 free_KRB_CRED(&cred); 410 out2: 411 krb5_free_creds (context, out_creds); 412 return ret; 413 } 414