get_in_tkt.c
1 /* 2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan 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 #ifndef HEIMDAL_SMALLER 37 38 static krb5_error_code 39 make_pa_enc_timestamp(krb5_context context, PA_DATA *pa, 40 krb5_enctype etype, krb5_keyblock *key) 41 { 42 PA_ENC_TS_ENC p; 43 unsigned char *buf; 44 size_t buf_size; 45 size_t len = 0; 46 EncryptedData encdata; 47 krb5_error_code ret; 48 int32_t usec; 49 int usec2; 50 krb5_crypto crypto; 51 52 krb5_us_timeofday (context, &p.patimestamp, &usec); 53 usec2 = usec; 54 p.pausec = &usec2; 55 56 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret); 57 if (ret) 58 return ret; 59 if(buf_size != len) 60 krb5_abortx(context, "internal error in ASN.1 encoder"); 61 ret = krb5_crypto_init(context, key, 0, &crypto); 62 if (ret) { 63 free(buf); 64 return ret; 65 } 66 ret = krb5_encrypt_EncryptedData(context, 67 crypto, 68 KRB5_KU_PA_ENC_TIMESTAMP, 69 buf, 70 len, 71 0, 72 &encdata); 73 free(buf); 74 krb5_crypto_destroy(context, crypto); 75 if (ret) 76 return ret; 77 78 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret); 79 free_EncryptedData(&encdata); 80 if (ret) 81 return ret; 82 if(buf_size != len) 83 krb5_abortx(context, "internal error in ASN.1 encoder"); 84 pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP; 85 pa->padata_value.length = len; 86 pa->padata_value.data = buf; 87 return 0; 88 } 89 90 static krb5_error_code 91 add_padata(krb5_context context, 92 METHOD_DATA *md, 93 krb5_principal client, 94 krb5_key_proc key_proc, 95 krb5_const_pointer keyseed, 96 krb5_enctype *enctypes, 97 unsigned netypes, 98 krb5_salt *salt) 99 { 100 krb5_error_code ret; 101 PA_DATA *pa2; 102 krb5_salt salt2; 103 krb5_enctype *ep; 104 size_t i; 105 106 if(salt == NULL) { 107 /* default to standard salt */ 108 ret = krb5_get_pw_salt (context, client, &salt2); 109 if (ret) 110 return ret; 111 salt = &salt2; 112 } 113 if (!enctypes) { 114 enctypes = context->etypes; 115 netypes = 0; 116 for (ep = enctypes; *ep != ETYPE_NULL; ep++) 117 netypes++; 118 } 119 pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val)); 120 if (pa2 == NULL) { 121 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", "")); 122 return ENOMEM; 123 } 124 md->val = pa2; 125 126 for (i = 0; i < netypes; ++i) { 127 krb5_keyblock *key; 128 129 ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key); 130 if (ret) 131 continue; 132 ret = make_pa_enc_timestamp (context, &md->val[md->len], 133 enctypes[i], key); 134 krb5_free_keyblock (context, key); 135 if (ret) 136 return ret; 137 ++md->len; 138 } 139 if(salt == &salt2) 140 krb5_free_salt(context, salt2); 141 return 0; 142 } 143 144 static krb5_error_code 145 init_as_req (krb5_context context, 146 KDCOptions opts, 147 krb5_creds *creds, 148 const krb5_addresses *addrs, 149 const krb5_enctype *etypes, 150 const krb5_preauthtype *ptypes, 151 const krb5_preauthdata *preauth, 152 krb5_key_proc key_proc, 153 krb5_const_pointer keyseed, 154 unsigned nonce, 155 AS_REQ *a) 156 { 157 krb5_error_code ret; 158 krb5_salt salt; 159 160 memset(a, 0, sizeof(*a)); 161 162 a->pvno = 5; 163 a->msg_type = krb_as_req; 164 a->req_body.kdc_options = opts; 165 a->req_body.cname = malloc(sizeof(*a->req_body.cname)); 166 if (a->req_body.cname == NULL) { 167 ret = ENOMEM; 168 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 169 goto fail; 170 } 171 a->req_body.sname = malloc(sizeof(*a->req_body.sname)); 172 if (a->req_body.sname == NULL) { 173 ret = ENOMEM; 174 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 175 goto fail; 176 } 177 ret = _krb5_principal2principalname (a->req_body.cname, creds->client); 178 if (ret) 179 goto fail; 180 ret = _krb5_principal2principalname (a->req_body.sname, creds->server); 181 if (ret) 182 goto fail; 183 ret = copy_Realm(&creds->client->realm, &a->req_body.realm); 184 if (ret) 185 goto fail; 186 187 if(creds->times.starttime) { 188 a->req_body.from = malloc(sizeof(*a->req_body.from)); 189 if (a->req_body.from == NULL) { 190 ret = ENOMEM; 191 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 192 goto fail; 193 } 194 *a->req_body.from = creds->times.starttime; 195 } 196 if(creds->times.endtime){ 197 ALLOC(a->req_body.till, 1); 198 *a->req_body.till = creds->times.endtime; 199 } 200 if(creds->times.renew_till){ 201 a->req_body.rtime = malloc(sizeof(*a->req_body.rtime)); 202 if (a->req_body.rtime == NULL) { 203 ret = ENOMEM; 204 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 205 goto fail; 206 } 207 *a->req_body.rtime = creds->times.renew_till; 208 } 209 a->req_body.nonce = nonce; 210 ret = _krb5_init_etype(context, 211 KRB5_PDU_AS_REQUEST, 212 &a->req_body.etype.len, 213 &a->req_body.etype.val, 214 etypes); 215 if (ret) 216 goto fail; 217 218 /* 219 * This means no addresses 220 */ 221 222 if (addrs && addrs->len == 0) { 223 a->req_body.addresses = NULL; 224 } else { 225 a->req_body.addresses = malloc(sizeof(*a->req_body.addresses)); 226 if (a->req_body.addresses == NULL) { 227 ret = ENOMEM; 228 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 229 goto fail; 230 } 231 232 if (addrs) 233 ret = krb5_copy_addresses(context, addrs, a->req_body.addresses); 234 else { 235 ret = krb5_get_all_client_addrs (context, a->req_body.addresses); 236 if(ret == 0 && a->req_body.addresses->len == 0) { 237 free(a->req_body.addresses); 238 a->req_body.addresses = NULL; 239 } 240 } 241 if (ret) 242 return ret; 243 } 244 245 a->req_body.enc_authorization_data = NULL; 246 a->req_body.additional_tickets = NULL; 247 248 if(preauth != NULL) { 249 size_t i; 250 ALLOC(a->padata, 1); 251 if(a->padata == NULL) { 252 ret = ENOMEM; 253 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 254 goto fail; 255 } 256 a->padata->val = NULL; 257 a->padata->len = 0; 258 for(i = 0; i < preauth->len; i++) { 259 if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){ 260 size_t j; 261 262 for(j = 0; j < preauth->val[i].info.len; j++) { 263 krb5_salt *sp = &salt; 264 if(preauth->val[i].info.val[j].salttype) 265 salt.salttype = *preauth->val[i].info.val[j].salttype; 266 else 267 salt.salttype = KRB5_PW_SALT; 268 if(preauth->val[i].info.val[j].salt) 269 salt.saltvalue = *preauth->val[i].info.val[j].salt; 270 else 271 if(salt.salttype == KRB5_PW_SALT) 272 sp = NULL; 273 else 274 krb5_data_zero(&salt.saltvalue); 275 ret = add_padata(context, a->padata, creds->client, 276 key_proc, keyseed, 277 &preauth->val[i].info.val[j].etype, 1, 278 sp); 279 if (ret == 0) 280 break; 281 } 282 } 283 } 284 } else 285 /* not sure this is the way to use `ptypes' */ 286 if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE) 287 a->padata = NULL; 288 else if (*ptypes == KRB5_PADATA_ENC_TIMESTAMP) { 289 ALLOC(a->padata, 1); 290 if (a->padata == NULL) { 291 ret = ENOMEM; 292 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 293 goto fail; 294 } 295 a->padata->len = 0; 296 a->padata->val = NULL; 297 298 /* make a v5 salted pa-data */ 299 add_padata(context, a->padata, creds->client, 300 key_proc, keyseed, a->req_body.etype.val, 301 a->req_body.etype.len, NULL); 302 303 /* make a v4 salted pa-data */ 304 salt.salttype = KRB5_PW_SALT; 305 krb5_data_zero(&salt.saltvalue); 306 add_padata(context, a->padata, creds->client, 307 key_proc, keyseed, a->req_body.etype.val, 308 a->req_body.etype.len, &salt); 309 } else { 310 ret = KRB5_PREAUTH_BAD_TYPE; 311 krb5_set_error_message (context, ret, 312 N_("pre-auth type %d not supported", ""), 313 *ptypes); 314 goto fail; 315 } 316 return 0; 317 fail: 318 free_AS_REQ(a); 319 return ret; 320 } 321 322 static int 323 set_ptypes(krb5_context context, 324 KRB_ERROR *error, 325 const krb5_preauthtype **ptypes, 326 krb5_preauthdata **preauth) 327 { 328 static krb5_preauthdata preauth2; 329 static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE }; 330 331 if(error->e_data) { 332 METHOD_DATA md; 333 size_t i; 334 decode_METHOD_DATA(error->e_data->data, 335 error->e_data->length, 336 &md, 337 NULL); 338 for(i = 0; i < md.len; i++){ 339 switch(md.val[i].padata_type){ 340 case KRB5_PADATA_ENC_TIMESTAMP: 341 *ptypes = ptypes2; 342 break; 343 case KRB5_PADATA_ETYPE_INFO: 344 *preauth = &preauth2; 345 ALLOC_SEQ(*preauth, 1); 346 (*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP; 347 decode_ETYPE_INFO(md.val[i].padata_value.data, 348 md.val[i].padata_value.length, 349 &(*preauth)->val[0].info, 350 NULL); 351 break; 352 default: 353 break; 354 } 355 } 356 free_METHOD_DATA(&md); 357 } else { 358 *ptypes = ptypes2; 359 } 360 return(1); 361 } 362 363 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 364 krb5_get_in_cred(krb5_context context, 365 krb5_flags options, 366 const krb5_addresses *addrs, 367 const krb5_enctype *etypes, 368 const krb5_preauthtype *ptypes, 369 const krb5_preauthdata *preauth, 370 krb5_key_proc key_proc, 371 krb5_const_pointer keyseed, 372 krb5_decrypt_proc decrypt_proc, 373 krb5_const_pointer decryptarg, 374 krb5_creds *creds, 375 krb5_kdc_rep *ret_as_reply) 376 KRB5_DEPRECATED_FUNCTION("Use X instead") 377 { 378 krb5_error_code ret; 379 AS_REQ a; 380 krb5_kdc_rep rep; 381 krb5_data req, resp; 382 size_t len = 0; 383 krb5_salt salt; 384 krb5_keyblock *key; 385 size_t size; 386 KDCOptions opts; 387 PA_DATA *pa; 388 krb5_enctype etype; 389 krb5_preauthdata *my_preauth = NULL; 390 unsigned nonce; 391 int done; 392 393 opts = int2KDCOptions(options); 394 395 krb5_generate_random_block (&nonce, sizeof(nonce)); 396 nonce &= 0xffffffff; 397 398 do { 399 done = 1; 400 ret = init_as_req (context, 401 opts, 402 creds, 403 addrs, 404 etypes, 405 ptypes, 406 preauth, 407 key_proc, 408 keyseed, 409 nonce, 410 &a); 411 if (my_preauth) { 412 free_ETYPE_INFO(&my_preauth->val[0].info); 413 free (my_preauth->val); 414 my_preauth = NULL; 415 } 416 if (ret) 417 return ret; 418 419 ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret); 420 free_AS_REQ(&a); 421 if (ret) 422 return ret; 423 if(len != req.length) 424 krb5_abortx(context, "internal error in ASN.1 encoder"); 425 426 ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp); 427 krb5_data_free(&req); 428 if (ret) 429 return ret; 430 431 memset (&rep, 0, sizeof(rep)); 432 ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size); 433 if(ret) { 434 /* let's try to parse it as a KRB-ERROR */ 435 KRB_ERROR error; 436 int ret2; 437 438 ret2 = krb5_rd_error(context, &resp, &error); 439 if(ret2 && resp.data && ((char*)resp.data)[0] == 4) 440 ret = KRB5KRB_AP_ERR_V4_REPLY; 441 krb5_data_free(&resp); 442 if (ret2 == 0) { 443 ret = krb5_error_from_rd_error(context, &error, creds); 444 /* if no preauth was set and KDC requires it, give it 445 one more try */ 446 if (!ptypes && !preauth 447 && ret == KRB5KDC_ERR_PREAUTH_REQUIRED 448 #if 0 449 || ret == KRB5KDC_ERR_BADOPTION 450 #endif 451 && set_ptypes(context, &error, &ptypes, &my_preauth)) { 452 done = 0; 453 preauth = my_preauth; 454 krb5_free_error_contents(context, &error); 455 krb5_clear_error_message(context); 456 continue; 457 } 458 if(ret_as_reply) 459 ret_as_reply->error = error; 460 else 461 free_KRB_ERROR (&error); 462 return ret; 463 } 464 return ret; 465 } 466 krb5_data_free(&resp); 467 } while(!done); 468 469 pa = NULL; 470 etype = rep.kdc_rep.enc_part.etype; 471 if(rep.kdc_rep.padata){ 472 int i = 0; 473 pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len, 474 KRB5_PADATA_PW_SALT, &i); 475 if(pa == NULL) { 476 i = 0; 477 pa = krb5_find_padata(rep.kdc_rep.padata->val, 478 rep.kdc_rep.padata->len, 479 KRB5_PADATA_AFS3_SALT, &i); 480 } 481 } 482 if(pa) { 483 salt.salttype = (krb5_salttype)pa->padata_type; 484 salt.saltvalue = pa->padata_value; 485 486 ret = (*key_proc)(context, etype, salt, keyseed, &key); 487 } else { 488 /* make a v5 salted pa-data */ 489 ret = krb5_get_pw_salt (context, creds->client, &salt); 490 491 if (ret) 492 goto out; 493 ret = (*key_proc)(context, etype, salt, keyseed, &key); 494 krb5_free_salt(context, salt); 495 } 496 if (ret) 497 goto out; 498 499 { 500 unsigned flags = EXTRACT_TICKET_TIMESYNC; 501 if (opts.request_anonymous) 502 flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH; 503 504 ret = _krb5_extract_ticket(context, 505 &rep, 506 creds, 507 key, 508 KRB5_KU_AS_REP_ENC_PART, 509 NULL, 510 nonce, 511 flags, 512 NULL, 513 decrypt_proc, 514 decryptarg); 515 } 516 memset (key->keyvalue.data, 0, key->keyvalue.length); 517 krb5_free_keyblock_contents (context, key); 518 free (key); 519 520 out: 521 if (ret == 0 && ret_as_reply) 522 *ret_as_reply = rep; 523 else 524 krb5_free_kdc_rep (context, &rep); 525 return ret; 526 } 527 528 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 529 krb5_get_in_tkt(krb5_context context, 530 krb5_flags options, 531 const krb5_addresses *addrs, 532 const krb5_enctype *etypes, 533 const krb5_preauthtype *ptypes, 534 krb5_key_proc key_proc, 535 krb5_const_pointer keyseed, 536 krb5_decrypt_proc decrypt_proc, 537 krb5_const_pointer decryptarg, 538 krb5_creds *creds, 539 krb5_ccache ccache, 540 krb5_kdc_rep *ret_as_reply) 541 KRB5_DEPRECATED_FUNCTION("Use X instead") 542 { 543 krb5_error_code ret; 544 545 ret = krb5_get_in_cred (context, 546 options, 547 addrs, 548 etypes, 549 ptypes, 550 NULL, 551 key_proc, 552 keyseed, 553 decrypt_proc, 554 decryptarg, 555 creds, 556 ret_as_reply); 557 if(ret) 558 return ret; 559 if (ccache) 560 ret = krb5_cc_store_cred (context, ccache, creds); 561 return ret; 562 } 563 564 #endif /* HEIMDAL_SMALLER */