1 /* $NetBSD: get_in_tkt.c,v 1.1.1.1 2011/04/13 18:15:34 elric Exp $ */ 2 3 /* 4 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #define KRB5_DEPRECATED 37 38 #include "krb5_locl.h" 39 40 #ifndef HEIMDAL_SMALLER 41 42 static krb5_error_code 43 make_pa_enc_timestamp(krb5_context context, PA_DATA *pa, 44 krb5_enctype etype, krb5_keyblock *key) 45 { 46 PA_ENC_TS_ENC p; 47 unsigned char *buf; 48 size_t buf_size; 49 size_t len; 50 EncryptedData encdata; 51 krb5_error_code ret; 52 int32_t usec; 53 int usec2; 54 krb5_crypto crypto; 55 56 krb5_us_timeofday (context, &p.patimestamp, &usec); 57 usec2 = usec; 58 p.pausec = &usec2; 59 60 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret); 61 if (ret) 62 return ret; 63 if(buf_size != len) 64 krb5_abortx(context, "internal error in ASN.1 encoder"); 65 ret = krb5_crypto_init(context, key, 0, &crypto); 66 if (ret) { 67 free(buf); 68 return ret; 69 } 70 ret = krb5_encrypt_EncryptedData(context, 71 crypto, 72 KRB5_KU_PA_ENC_TIMESTAMP, 73 buf, 74 len, 75 0, 76 &encdata); 77 free(buf); 78 krb5_crypto_destroy(context, crypto); 79 if (ret) 80 return ret; 81 82 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret); 83 free_EncryptedData(&encdata); 84 if (ret) 85 return ret; 86 if(buf_size != len) 87 krb5_abortx(context, "internal error in ASN.1 encoder"); 88 pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP; 89 pa->padata_value.length = len; 90 pa->padata_value.data = buf; 91 return 0; 92 } 93 94 static krb5_error_code 95 add_padata(krb5_context context, 96 METHOD_DATA *md, 97 krb5_principal client, 98 krb5_key_proc key_proc, 99 krb5_const_pointer keyseed, 100 krb5_enctype *enctypes, 101 unsigned netypes, 102 krb5_salt *salt) 103 { 104 krb5_error_code ret; 105 PA_DATA *pa2; 106 krb5_salt salt2; 107 krb5_enctype *ep; 108 int i; 109 110 if(salt == NULL) { 111 /* default to standard salt */ 112 ret = krb5_get_pw_salt (context, client, &salt2); 113 if (ret) 114 return ret; 115 salt = &salt2; 116 } 117 if (!enctypes) { 118 enctypes = context->etypes; 119 netypes = 0; 120 for (ep = enctypes; *ep != ETYPE_NULL; ep++) 121 netypes++; 122 } 123 pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val)); 124 if (pa2 == NULL) { 125 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", "")); 126 return ENOMEM; 127 } 128 md->val = pa2; 129 130 for (i = 0; i < netypes; ++i) { 131 krb5_keyblock *key; 132 133 ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key); 134 if (ret) 135 continue; 136 ret = make_pa_enc_timestamp (context, &md->val[md->len], 137 enctypes[i], key); 138 krb5_free_keyblock (context, key); 139 if (ret) 140 return ret; 141 ++md->len; 142 } 143 if(salt == &salt2) 144 krb5_free_salt(context, salt2); 145 return 0; 146 } 147 148 static krb5_error_code 149 init_as_req (krb5_context context, 150 KDCOptions opts, 151 krb5_creds *creds, 152 const krb5_addresses *addrs, 153 const krb5_enctype *etypes, 154 const krb5_preauthtype *ptypes, 155 const krb5_preauthdata *preauth, 156 krb5_key_proc key_proc, 157 krb5_const_pointer keyseed, 158 unsigned nonce, 159 AS_REQ *a) 160 { 161 krb5_error_code ret; 162 krb5_salt salt; 163 164 memset(a, 0, sizeof(*a)); 165 166 a->pvno = 5; 167 a->msg_type = krb_as_req; 168 a->req_body.kdc_options = opts; 169 a->req_body.cname = malloc(sizeof(*a->req_body.cname)); 170 if (a->req_body.cname == NULL) { 171 ret = ENOMEM; 172 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 173 goto fail; 174 } 175 a->req_body.sname = malloc(sizeof(*a->req_body.sname)); 176 if (a->req_body.sname == NULL) { 177 ret = ENOMEM; 178 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 179 goto fail; 180 } 181 ret = _krb5_principal2principalname (a->req_body.cname, creds->client); 182 if (ret) 183 goto fail; 184 ret = _krb5_principal2principalname (a->req_body.sname, creds->server); 185 if (ret) 186 goto fail; 187 ret = copy_Realm(&creds->client->realm, &a->req_body.realm); 188 if (ret) 189 goto fail; 190 191 if(creds->times.starttime) { 192 a->req_body.from = malloc(sizeof(*a->req_body.from)); 193 if (a->req_body.from == NULL) { 194 ret = ENOMEM; 195 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 196 goto fail; 197 } 198 *a->req_body.from = creds->times.starttime; 199 } 200 if(creds->times.endtime){ 201 ALLOC(a->req_body.till, 1); 202 *a->req_body.till = creds->times.endtime; 203 } 204 if(creds->times.renew_till){ 205 a->req_body.rtime = malloc(sizeof(*a->req_body.rtime)); 206 if (a->req_body.rtime == NULL) { 207 ret = ENOMEM; 208 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 209 goto fail; 210 } 211 *a->req_body.rtime = creds->times.renew_till; 212 } 213 a->req_body.nonce = nonce; 214 ret = krb5_init_etype (context, 215 &a->req_body.etype.len, 216 &a->req_body.etype.val, 217 etypes); 218 if (ret) 219 goto fail; 220 221 /* 222 * This means no addresses 223 */ 224 225 if (addrs && addrs->len == 0) { 226 a->req_body.addresses = NULL; 227 } else { 228 a->req_body.addresses = malloc(sizeof(*a->req_body.addresses)); 229 if (a->req_body.addresses == NULL) { 230 ret = ENOMEM; 231 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 232 goto fail; 233 } 234 235 if (addrs) 236 ret = krb5_copy_addresses(context, addrs, a->req_body.addresses); 237 else { 238 ret = krb5_get_all_client_addrs (context, a->req_body.addresses); 239 if(ret == 0 && a->req_body.addresses->len == 0) { 240 free(a->req_body.addresses); 241 a->req_body.addresses = NULL; 242 } 243 } 244 if (ret) 245 return ret; 246 } 247 248 a->req_body.enc_authorization_data = NULL; 249 a->req_body.additional_tickets = NULL; 250 251 if(preauth != NULL) { 252 int i; 253 ALLOC(a->padata, 1); 254 if(a->padata == NULL) { 255 ret = ENOMEM; 256 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 257 goto fail; 258 } 259 a->padata->val = NULL; 260 a->padata->len = 0; 261 for(i = 0; i < preauth->len; i++) { 262 if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){ 263 int j; 264 265 for(j = 0; j < preauth->val[i].info.len; j++) { 266 krb5_salt *sp = &salt; 267 if(preauth->val[i].info.val[j].salttype) 268 salt.salttype = *preauth->val[i].info.val[j].salttype; 269 else 270 salt.salttype = KRB5_PW_SALT; 271 if(preauth->val[i].info.val[j].salt) 272 salt.saltvalue = *preauth->val[i].info.val[j].salt; 273 else 274 if(salt.salttype == KRB5_PW_SALT) 275 sp = NULL; 276 else 277 krb5_data_zero(&salt.saltvalue); 278 ret = add_padata(context, a->padata, creds->client, 279 key_proc, keyseed, 280 &preauth->val[i].info.val[j].etype, 1, 281 sp); 282 if (ret == 0) 283 break; 284 } 285 } 286 } 287 } else 288 /* not sure this is the way to use `ptypes' */ 289 if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE) 290 a->padata = NULL; 291 else if (*ptypes == KRB5_PADATA_ENC_TIMESTAMP) { 292 ALLOC(a->padata, 1); 293 if (a->padata == NULL) { 294 ret = ENOMEM; 295 krb5_set_error_message(context, ret, N_("malloc: out of memory", "")); 296 goto fail; 297 } 298 a->padata->len = 0; 299 a->padata->val = NULL; 300 301 /* make a v5 salted pa-data */ 302 add_padata(context, a->padata, creds->client, 303 key_proc, keyseed, a->req_body.etype.val, 304 a->req_body.etype.len, NULL); 305 306 /* make a v4 salted pa-data */ 307 salt.salttype = KRB5_PW_SALT; 308 krb5_data_zero(&salt.saltvalue); 309 add_padata(context, a->padata, creds->client, 310 key_proc, keyseed, a->req_body.etype.val, 311 a->req_body.etype.len, &salt); 312 } else { 313 ret = KRB5_PREAUTH_BAD_TYPE; 314 krb5_set_error_message (context, ret, 315 N_("pre-auth type %d not supported", ""), 316 *ptypes); 317 goto fail; 318 } 319 return 0; 320 fail: 321 free_AS_REQ(a); 322 return ret; 323 } 324 325 static int 326 set_ptypes(krb5_context context, 327 KRB_ERROR *error, 328 const krb5_preauthtype **ptypes, 329 krb5_preauthdata **preauth) 330 { 331 static krb5_preauthdata preauth2; 332 static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE }; 333 334 if(error->e_data) { 335 METHOD_DATA md; 336 int i; 337 decode_METHOD_DATA(error->e_data->data, 338 error->e_data->length, 339 &md, 340 NULL); 341 for(i = 0; i < md.len; i++){ 342 switch(md.val[i].padata_type){ 343 case KRB5_PADATA_ENC_TIMESTAMP: 344 *ptypes = ptypes2; 345 break; 346 case KRB5_PADATA_ETYPE_INFO: 347 *preauth = &preauth2; 348 ALLOC_SEQ(*preauth, 1); 349 (*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP; 350 decode_ETYPE_INFO(md.val[i].padata_value.data, 351 md.val[i].padata_value.length, 352 &(*preauth)->val[0].info, 353 NULL); 354 break; 355 default: 356 break; 357 } 358 } 359 free_METHOD_DATA(&md); 360 } else { 361 *ptypes = ptypes2; 362 } 363 return(1); 364 } 365 366 KRB5_DEPRECATED 367 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 368 krb5_get_in_cred(krb5_context context, 369 krb5_flags options, 370 const krb5_addresses *addrs, 371 const krb5_enctype *etypes, 372 const krb5_preauthtype *ptypes, 373 const krb5_preauthdata *preauth, 374 krb5_key_proc key_proc, 375 krb5_const_pointer keyseed, 376 krb5_decrypt_proc decrypt_proc, 377 krb5_const_pointer decryptarg, 378 krb5_creds *creds, 379 krb5_kdc_rep *ret_as_reply) 380 { 381 krb5_error_code ret; 382 AS_REQ a; 383 krb5_kdc_rep rep; 384 krb5_data req, resp; 385 size_t len; 386 krb5_salt salt; 387 krb5_keyblock *key; 388 size_t size; 389 KDCOptions opts; 390 PA_DATA *pa; 391 krb5_enctype etype; 392 krb5_preauthdata *my_preauth = NULL; 393 unsigned nonce; 394 int done; 395 396 opts = int2KDCOptions(options); 397 398 krb5_generate_random_block (&nonce, sizeof(nonce)); 399 nonce &= 0xffffffff; 400 401 do { 402 done = 1; 403 ret = init_as_req (context, 404 opts, 405 creds, 406 addrs, 407 etypes, 408 ptypes, 409 preauth, 410 key_proc, 411 keyseed, 412 nonce, 413 &a); 414 if (my_preauth) { 415 free_ETYPE_INFO(&my_preauth->val[0].info); 416 free (my_preauth->val); 417 my_preauth = NULL; 418 } 419 if (ret) 420 return ret; 421 422 ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret); 423 free_AS_REQ(&a); 424 if (ret) 425 return ret; 426 if(len != req.length) 427 krb5_abortx(context, "internal error in ASN.1 encoder"); 428 429 ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp); 430 krb5_data_free(&req); 431 if (ret) 432 return ret; 433 434 memset (&rep, 0, sizeof(rep)); 435 ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size); 436 if(ret) { 437 /* let's try to parse it as a KRB-ERROR */ 438 KRB_ERROR error; 439 int ret2; 440 441 ret2 = krb5_rd_error(context, &resp, &error); 442 if(ret2 && resp.data && ((char*)resp.data)[0] == 4) 443 ret = KRB5KRB_AP_ERR_V4_REPLY; 444 krb5_data_free(&resp); 445 if (ret2 == 0) { 446 ret = krb5_error_from_rd_error(context, &error, creds); 447 /* if no preauth was set and KDC requires it, give it 448 one more try */ 449 if (!ptypes && !preauth 450 && ret == KRB5KDC_ERR_PREAUTH_REQUIRED 451 #if 0 452 || ret == KRB5KDC_ERR_BADOPTION 453 #endif 454 && set_ptypes(context, &error, &ptypes, &my_preauth)) { 455 done = 0; 456 preauth = my_preauth; 457 krb5_free_error_contents(context, &error); 458 krb5_clear_error_message(context); 459 continue; 460 } 461 if(ret_as_reply) 462 ret_as_reply->error = error; 463 else 464 free_KRB_ERROR (&error); 465 return ret; 466 } 467 return ret; 468 } 469 krb5_data_free(&resp); 470 } while(!done); 471 472 pa = NULL; 473 etype = rep.kdc_rep.enc_part.etype; 474 if(rep.kdc_rep.padata){ 475 int i = 0; 476 pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len, 477 KRB5_PADATA_PW_SALT, &i); 478 if(pa == NULL) { 479 i = 0; 480 pa = krb5_find_padata(rep.kdc_rep.padata->val, 481 rep.kdc_rep.padata->len, 482 KRB5_PADATA_AFS3_SALT, &i); 483 } 484 } 485 if(pa) { 486 salt.salttype = pa->padata_type; 487 salt.saltvalue = pa->padata_value; 488 489 ret = (*key_proc)(context, etype, salt, keyseed, &key); 490 } else { 491 /* make a v5 salted pa-data */ 492 ret = krb5_get_pw_salt (context, creds->client, &salt); 493 494 if (ret) 495 goto out; 496 ret = (*key_proc)(context, etype, salt, keyseed, &key); 497 krb5_free_salt(context, salt); 498 } 499 if (ret) 500 goto out; 501 502 { 503 unsigned flags = EXTRACT_TICKET_TIMESYNC; 504 if (opts.request_anonymous) 505 flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH; 506 507 ret = _krb5_extract_ticket(context, 508 &rep, 509 creds, 510 key, 511 keyseed, 512 KRB5_KU_AS_REP_ENC_PART, 513 NULL, 514 nonce, 515 flags, 516 decrypt_proc, 517 decryptarg); 518 } 519 memset (key->keyvalue.data, 0, key->keyvalue.length); 520 krb5_free_keyblock_contents (context, key); 521 free (key); 522 523 out: 524 if (ret == 0 && ret_as_reply) 525 *ret_as_reply = rep; 526 else 527 krb5_free_kdc_rep (context, &rep); 528 return ret; 529 } 530 531 KRB5_DEPRECATED 532 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 533 krb5_get_in_tkt(krb5_context context, 534 krb5_flags options, 535 const krb5_addresses *addrs, 536 const krb5_enctype *etypes, 537 const krb5_preauthtype *ptypes, 538 krb5_key_proc key_proc, 539 krb5_const_pointer keyseed, 540 krb5_decrypt_proc decrypt_proc, 541 krb5_const_pointer decryptarg, 542 krb5_creds *creds, 543 krb5_ccache ccache, 544 krb5_kdc_rep *ret_as_reply) 545 { 546 krb5_error_code ret; 547 548 ret = krb5_get_in_cred (context, 549 options, 550 addrs, 551 etypes, 552 ptypes, 553 NULL, 554 key_proc, 555 keyseed, 556 decrypt_proc, 557 decryptarg, 558 creds, 559 ret_as_reply); 560 if(ret) 561 return ret; 562 if (ccache) 563 ret = krb5_cc_store_cred (context, ccache, creds); 564 return ret; 565 } 566 567 #endif /* HEIMDAL_SMALLER */ 568