lib/krb5/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 RCSID("$Id$");
  37
  38 krb5_error_code KRB5_LIB_FUNCTION
  39 krb5_init_etype (krb5_context context,
  40                  unsigned *len,
  41                  krb5_enctype **val,
  42                  const krb5_enctype *etypes)
  43 {
  44     unsigned int i;
  45     krb5_error_code ret;
  46     krb5_enctype *tmp = NULL;
  47
  48     ret = 0;
  49     if (etypes == NULL) {
  50         ret = krb5_get_default_in_tkt_etypes(context,
  51                                              &tmp);
  52         if (ret)
  53             return ret;
  54         etypes = tmp;
  55     }
  56
  57     for (i = 0; etypes[i]; ++i)
  58         ;
  59     *len = i;
  60     *val = malloc(i * sizeof(**val));
  61     if (i != 0 && *val == NULL) {
  62         ret = ENOMEM;
  63         krb5_set_error_string(context, "malloc: out of memory");
  64         goto cleanup;
  65     }
  66     memmove (*val,
  67              etypes,
  68              i * sizeof(*tmp));
  69 cleanup:
  70     if (tmp != NULL)
  71         free (tmp);
  72     return ret;
  73 }
  74
  75 static krb5_error_code
  76 check_server_referral(krb5_context context,
  77                       krb5_kdc_rep *rep,
  78                       unsigned flags,
  79                       krb5_const_principal requested,
  80                       krb5_const_principal returned,
  81                       const krb5_keyblock const * key)
  82 {
  83     krb5_error_code ret;
  84     PA_ServerReferralData ref;
  85     krb5_crypto session;
  86     EncryptedData ed;
  87     size_t len;
  88     krb5_data data;
  89     PA_DATA *pa;
  90     int i = 0, cmp;
  91
  92     if (rep->kdc_rep.padata == NULL)
  93         goto noreferral;
  94
  95     pa = krb5_find_padata(rep->kdc_rep.padata->val,
  96                           rep->kdc_rep.padata->len,
  97                           KRB5_PADATA_SERVER_REFERRAL, &i);
  98     if (pa == NULL)
  99         goto noreferral;
 100
 101     memset(&ed, 0, sizeof(ed));
 102     memset(&ref, 0, sizeof(ref));
 103
 104     ret = decode_EncryptedData(pa->padata_value.data,
 105                                pa->padata_value.length,
 106                                &ed, &len);
 107     if (ret)
 108         return ret;
 109     if (len != pa->padata_value.length) {
 110         free_EncryptedData(&ed);
 111         krb5_set_error_string(context, "Referral EncryptedData wrong");
 112         return KRB5KRB_AP_ERR_MODIFIED;
 113     }
 114
 115     ret = krb5_crypto_init(context, key, 0, &session);
 116     if (ret) {
 117         free_EncryptedData(&ed);
 118         return ret;
 119     }
 120
 121     ret = krb5_decrypt_EncryptedData(context, session,
 122                                      KRB5_KU_PA_SERVER_REFERRAL,
 123                                      &ed, &data);
 124     free_EncryptedData(&ed);
 125     krb5_crypto_destroy(context, session);
 126     if (ret)
 127         return ret;
 128
 129     ret = decode_PA_ServerReferralData(data.data, data.length, &ref, &len);
 130     if (ret) {
 131         krb5_data_free(&data);
 132         return ret;
 133     }
 134     krb5_data_free(&data);
 135
 136     if (strcmp(requested->realm, returned->realm) != 0) {
 137         free_PA_ServerReferralData(&ref);
 138         krb5_set_error_string(context, "server ref realm mismatch");
 139         return KRB5KRB_AP_ERR_MODIFIED;
 140     }
 141
 142     if (returned->name.name_string.len == 2 &&
 143         strcmp(returned->name.name_string.val[0], KRB5_TGS_NAME) == 0)
 144     {
 145         const char *realm = returned->name.name_string.val[1];
 146
 147         if (ref.referred_realm == NULL
 148             || strcmp(*ref.referred_realm, realm) != 0)
 149         {
 150             free_PA_ServerReferralData(&ref);
 151             krb5_set_error_string(context, "tgt returned with wrong ref");
 152             return KRB5KRB_AP_ERR_MODIFIED;
 153         }
 154     } else if (krb5_principal_compare(context, returned, requested) == 0) {
 155         free_PA_ServerReferralData(&ref);
 156         krb5_set_error_string(context, "req princ no same as returned");
 157         return KRB5KRB_AP_ERR_MODIFIED;
 158     }
 159
 160     if (ref.requested_principal_name) {
 161         cmp = _krb5_principal_compare_PrincipalName(context,
 162                                                     requested,
 163                                                     ref.requested_principal_name);
 164         if (!cmp) {
 165             free_PA_ServerReferralData(&ref);
 166             krb5_set_error_string(context, "compare requested failed");
 167             return KRB5KRB_AP_ERR_MODIFIED;
 168         }
 169     } else if (flags & EXTRACT_TICKET_AS_REQ) {
 170         free_PA_ServerReferralData(&ref);
 171         krb5_set_error_string(context, "Requested principal missing on AS-REQ");
 172         return KRB5KRB_AP_ERR_MODIFIED;
 173     }
 174
 175     free_PA_ServerReferralData(&ref);
 176
 177     return ret;
 178 noreferral:
 179     if (krb5_principal_compare(context, requested, returned) == FALSE) {
 180         krb5_set_error_string(context, "Not same server principal returned "
 181                               "as requested");
 182         return KRB5KRB_AP_ERR_MODIFIED;
 183     }
 184     return 0;
 185 }
 186
 187
 188 /*
 189  * Verify referral data
 190  */
 191
 192
 193 static krb5_error_code
 194 check_client_referral(krb5_context context,
 195                       krb5_kdc_rep *rep,
 196                       krb5_const_principal requested,
 197                       krb5_const_principal mapped,
 198                       krb5_keyblock const * key)
 199 {
 200     krb5_error_code ret;
 201     PA_ClientCanonicalized canon;
 202     krb5_crypto crypto;
 203     krb5_data data;
 204     PA_DATA *pa;
 205     size_t len;
 206     int i = 0;
 207
 208     if (rep->kdc_rep.padata == NULL)
 209         goto noreferral;
 210
 211     pa = krb5_find_padata(rep->kdc_rep.padata->val,
 212                           rep->kdc_rep.padata->len,
 213                           KRB5_PADATA_CLIENT_CANONICALIZED, &i);
 214     if (pa == NULL)
 215         goto noreferral;
 216
 217     ret = decode_PA_ClientCanonicalized(pa->padata_value.data,
 218                                         pa->padata_value.length,
 219                                         &canon, &len);
 220     if (ret) {
 221         krb5_set_error_string(context, "Failed to decode "
 222                               "PA_ClientCanonicalized");
 223         return ret;
 224     }
 225
 226     ASN1_MALLOC_ENCODE(PA_ClientCanonicalizedNames, data.data, data.length,
 227                        &canon.names, &len, ret);
 228     if (ret) {
 229         free_PA_ClientCanonicalized(&canon);
 230         return ret;
 231     }
 232     if (data.length != len)
 233         krb5_abortx(context, "internal asn.1 error");
 234
 235     ret = krb5_crypto_init(context, key, 0, &crypto);
 236     if (ret) {
 237         free(data.data);
 238         free_PA_ClientCanonicalized(&canon);
 239         return ret;
 240     }
 241
 242     ret = krb5_verify_checksum(context, crypto, KRB5_KU_CANONICALIZED_NAMES,
 243                                data.data, data.length,
 244                                &canon.canon_checksum);
 245     krb5_crypto_destroy(context, crypto);
 246     free(data.data);
 247     if (ret) {
 248         krb5_set_error_string(context, "Failed to verify "
 249                               "client canonicalized data");
 250         free_PA_ClientCanonicalized(&canon);
 251         return ret;
 252     }
 253
 254     if (!_krb5_principal_compare_PrincipalName(context,
 255                                                requested,
 256                                                &canon.names.requested_name))
 257     {
 258         free_PA_ClientCanonicalized(&canon);
 259         krb5_set_error_string(context, "Requested name doesn't match"
 260                               " in client referral");
 261         return KRB5_PRINC_NOMATCH;
 262     }
 263     if (!_krb5_principal_compare_PrincipalName(context,
 264                                                mapped,
 265                                                &canon.names.mapped_name))
 266     {
 267         free_PA_ClientCanonicalized(&canon);
 268         krb5_set_error_string(context, "Mapped name doesn't match"
 269                               " in client referral");
 270         return KRB5_PRINC_NOMATCH;
 271     }
 272
 273     return 0;
 274
 275 noreferral:
 276     if (krb5_principal_compare(context, requested, mapped) == FALSE) {
 277         krb5_set_error_string(context, "Not same client principal returned "
 278                               "as requested");
 279         return KRB5KRB_AP_ERR_MODIFIED;
 280     }
 281     return 0;
 282 }
 283
 284
 285
 286 static krb5_error_code
 287 decrypt_tkt (krb5_context context,
 288              krb5_keyblock *key,
 289              krb5_key_usage usage,
 290              krb5_const_pointer decrypt_arg,
 291              krb5_kdc_rep *dec_rep)
 292 {
 293     krb5_error_code ret;
 294     krb5_data data;
 295     size_t size;
 296     krb5_crypto crypto;
 297
 298     ret = krb5_crypto_init(context, key, 0, &crypto);
 299     if (ret)
 300         return ret;
 301
 302     ret = krb5_decrypt_EncryptedData (context,
 303                                       crypto,
 304                                       usage,
 305                                       &dec_rep->kdc_rep.enc_part,
 306                                       &data);
 307     krb5_crypto_destroy(context, crypto);
 308
 309     if (ret)
 310         return ret;
 311
 312     ret = krb5_decode_EncASRepPart(context,
 313                                    data.data,
 314                                    data.length,
 315                                    &dec_rep->enc_part,
 316                                    &size);
 317     if (ret)
 318         ret = krb5_decode_EncTGSRepPart(context,
 319                                         data.data,
 320                                         data.length,
 321                                         &dec_rep->enc_part,
 322                                         &size);
 323     krb5_data_free (&data);
 324     if (ret)
 325         return ret;
 326     return 0;
 327 }
 328
 329 int
 330 _krb5_extract_ticket(krb5_context context,
 331                      krb5_kdc_rep *rep,
 332                      krb5_creds *creds,
 333                      krb5_keyblock *key,
 334                      krb5_const_pointer keyseed,
 335                      krb5_key_usage key_usage,
 336                      krb5_addresses *addrs,
 337                      unsigned nonce,
 338                      unsigned flags,
 339                      krb5_decrypt_proc decrypt_proc,
 340                      krb5_const_pointer decryptarg)
 341 {
 342     krb5_error_code ret;
 343     krb5_principal tmp_principal;
 344     size_t len;
 345     time_t tmp_time;
 346     krb5_timestamp sec_now;
 347
 348     /* decrypt */
 349
 350     if (decrypt_proc == NULL)
 351         decrypt_proc = decrypt_tkt;
 352
 353     ret = (*decrypt_proc)(context, key, key_usage, decryptarg, rep);
 354     if (ret)
 355         goto out;
 356
 357     /* save session key */
 358
 359     creds->session.keyvalue.length = 0;
 360     creds->session.keyvalue.data   = NULL;
 361     creds->session.keytype = rep->enc_part.key.keytype;
 362     ret = krb5_data_copy (&creds->session.keyvalue,
 363                           rep->enc_part.key.keyvalue.data,
 364                           rep->enc_part.key.keyvalue.length);
 365     if (ret) {
 366         krb5_clear_error_string(context);
 367         goto out;
 368     }
 369
 370     /* compare client and save */
 371     ret = _krb5_principalname2krb5_principal (context,
 372                                               &tmp_principal,
 373                                               rep->kdc_rep.cname,
 374                                               rep->kdc_rep.crealm);
 375     if (ret)
 376         goto out;
 377
 378     /* check client referral and save principal */
 379     /* anonymous here ? */
 380     if((flags & EXTRACT_TICKET_ALLOW_CNAME_MISMATCH) == 0) {
 381         ret = check_client_referral(context, rep,
 382                                     creds->client,
 383                                     tmp_principal,
 384                                     &creds->session);
 385         if (ret) {
 386             krb5_free_principal (context, tmp_principal);
 387             goto out;
 388         }
 389     }
 390     krb5_free_principal (context, creds->client);
 391     creds->client = tmp_principal;
 392
 393     /* check server referral and save principal */
 394     ret = _krb5_principalname2krb5_principal (context,
 395                                               &tmp_principal,
 396                                               rep->kdc_rep.ticket.sname,
 397                                               rep->kdc_rep.ticket.realm);
 398     if (ret)
 399         goto out;
 400     if((flags & EXTRACT_TICKET_ALLOW_SERVER_MISMATCH) == 0){
 401         ret = check_server_referral(context,
 402                                     rep,
 403                                     flags,
 404                                     creds->server,
 405                                     tmp_principal,
 406                                     &creds->session);
 407         if (ret) {
 408             krb5_free_principal (context, tmp_principal);
 409             goto out;
 410         }
 411     }
 412     krb5_free_principal(context, creds->server);
 413     creds->server = tmp_principal;
 414
 415     /* verify names */
 416     if(flags & EXTRACT_TICKET_MATCH_REALM){
 417         const char *srealm = krb5_principal_get_realm(context, creds->server);
 418         const char *crealm = krb5_principal_get_realm(context, creds->client);
 419
 420         if (strcmp(rep->enc_part.srealm, srealm) != 0 ||
 421             strcmp(rep->enc_part.srealm, crealm) != 0)
 422         {
 423             ret = KRB5KRB_AP_ERR_MODIFIED;
 424             krb5_clear_error_string(context);
 425             goto out;
 426         }
 427     }
 428
 429     /* compare nonces */
 430
 431     if (nonce != rep->enc_part.nonce) {
 432         ret = KRB5KRB_AP_ERR_MODIFIED;
 433         krb5_set_error_string(context, "malloc: out of memory");
 434         goto out;
 435     }
 436
 437     /* set kdc-offset */
 438
 439     krb5_timeofday (context, &sec_now);
 440     if (rep->enc_part.flags.initial
 441         && context->kdc_sec_offset == 0
 442         && krb5_config_get_bool (context, NULL,
 443                                  "libdefaults",
 444                                  "kdc_timesync",
 445                                  NULL)) {
 446         context->kdc_sec_offset = rep->enc_part.authtime - sec_now;
 447         krb5_timeofday (context, &sec_now);
 448     }
 449
 450     /* check all times */
 451
 452     if (rep->enc_part.starttime) {
 453         tmp_time = *rep->enc_part.starttime;
 454     } else
 455         tmp_time = rep->enc_part.authtime;
 456
 457     if (creds->times.starttime == 0
 458         && abs(tmp_time - sec_now) > context->max_skew) {
 459         ret = KRB5KRB_AP_ERR_SKEW;
 460         krb5_set_error_string (context,
 461                                "time skew (%d) larger than max (%d)",
 462                                abs(tmp_time - sec_now),
 463                                (int)context->max_skew);
 464         goto out;
 465     }
 466
 467     if (creds->times.starttime != 0
 468         && tmp_time != creds->times.starttime) {
 469         krb5_clear_error_string (context);
 470         ret = KRB5KRB_AP_ERR_MODIFIED;
 471         goto out;
 472     }
 473
 474     creds->times.starttime = tmp_time;
 475
 476     if (rep->enc_part.renew_till) {
 477         tmp_time = *rep->enc_part.renew_till;
 478     } else
 479         tmp_time = 0;
 480
 481     if (creds->times.renew_till != 0
 482         && tmp_time > creds->times.renew_till) {
 483         krb5_clear_error_string (context);
 484         ret = KRB5KRB_AP_ERR_MODIFIED;
 485         goto out;
 486     }
 487
 488     creds->times.renew_till = tmp_time;
 489
 490     creds->times.authtime = rep->enc_part.authtime;
 491
 492     if (creds->times.endtime != 0
 493         && rep->enc_part.endtime > creds->times.endtime) {
 494         krb5_clear_error_string (context);
 495         ret = KRB5KRB_AP_ERR_MODIFIED;
 496         goto out;
 497     }
 498
 499     creds->times.endtime  = rep->enc_part.endtime;
 500
 501     if(rep->enc_part.caddr)
 502         krb5_copy_addresses (context, rep->enc_part.caddr, &creds->addresses);
 503     else if(addrs)
 504         krb5_copy_addresses (context, addrs, &creds->addresses);
 505     else {
 506         creds->addresses.len = 0;
 507         creds->addresses.val = NULL;
 508     }
 509     creds->flags.b = rep->enc_part.flags;
 510
 511     creds->authdata.len = 0;
 512     creds->authdata.val = NULL;
 513
 514     /* extract ticket */
 515     ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length,
 516                        &rep->kdc_rep.ticket, &len, ret);
 517     if(ret)
 518         goto out;
 519     if (creds->ticket.length != len)
 520         krb5_abortx(context, "internal error in ASN.1 encoder");
 521     creds->second_ticket.length = 0;
 522     creds->second_ticket.data   = NULL;
 523
 524
 525 out:
 526     memset (rep->enc_part.key.keyvalue.data, 0,
 527             rep->enc_part.key.keyvalue.length);
 528     return ret;
 529 }
 530
 531
 532 static krb5_error_code
 533 make_pa_enc_timestamp(krb5_context context, PA_DATA *pa,
 534                       krb5_enctype etype, krb5_keyblock *key)
 535 {
 536     PA_ENC_TS_ENC p;
 537     unsigned char *buf;
 538     size_t buf_size;
 539     size_t len;
 540     EncryptedData encdata;
 541     krb5_error_code ret;
 542     int32_t usec;
 543     int usec2;
 544     krb5_crypto crypto;
 545
 546     krb5_us_timeofday (context, &p.patimestamp, &usec);
 547     usec2         = usec;
 548     p.pausec      = &usec2;
 549
 550     ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
 551     if (ret)
 552         return ret;
 553     if(buf_size != len)
 554         krb5_abortx(context, "internal error in ASN.1 encoder");
 555     ret = krb5_crypto_init(context, key, 0, &crypto);
 556     if (ret) {
 557         free(buf);
 558         return ret;
 559     }
 560     ret = krb5_encrypt_EncryptedData(context,
 561                                      crypto,
 562                                      KRB5_KU_PA_ENC_TIMESTAMP,
 563                                      buf,
 564                                      len,
 565                                      0,
 566                                      &encdata);
 567     free(buf);
 568     krb5_crypto_destroy(context, crypto);
 569     if (ret)
 570         return ret;
 571
 572     ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
 573     free_EncryptedData(&encdata);
 574     if (ret)
 575         return ret;
 576     if(buf_size != len)
 577         krb5_abortx(context, "internal error in ASN.1 encoder");
 578     pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP;
 579     pa->padata_value.length = len;
 580     pa->padata_value.data = buf;
 581     return 0;
 582 }
 583
 584 static krb5_error_code
 585 add_padata(krb5_context context,
 586            METHOD_DATA *md,
 587            krb5_principal client,
 588            krb5_key_proc key_proc,
 589            krb5_const_pointer keyseed,
 590            krb5_enctype *enctypes,
 591            unsigned netypes,
 592            krb5_salt *salt)
 593 {
 594     krb5_error_code ret;
 595     PA_DATA *pa2;
 596     krb5_salt salt2;
 597     krb5_enctype *ep;
 598     int i;
 599
 600     if(salt == NULL) {
 601         /* default to standard salt */
 602         ret = krb5_get_pw_salt (context, client, &salt2);
 603         salt = &salt2;
 604     }
 605     if (!enctypes) {
 606         enctypes = context->etypes;
 607         netypes = 0;
 608         for (ep = enctypes; *ep != ETYPE_NULL; ep++)
 609             netypes++;
 610     }
 611     pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
 612     if (pa2 == NULL) {
 613         krb5_set_error_string(context, "malloc: out of memory");
 614         return ENOMEM;
 615     }
 616     md->val = pa2;
 617
 618     for (i = 0; i < netypes; ++i) {
 619         krb5_keyblock *key;
 620
 621         ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key);
 622         if (ret)
 623             continue;
 624         ret = make_pa_enc_timestamp (context, &md->val[md->len],
 625                                      enctypes[i], key);
 626         krb5_free_keyblock (context, key);
 627         if (ret)
 628             return ret;
 629         ++md->len;
 630     }
 631     if(salt == &salt2)
 632         krb5_free_salt(context, salt2);
 633     return 0;
 634 }
 635
 636 static krb5_error_code
 637 init_as_req (krb5_context context,
 638              KDCOptions opts,
 639              krb5_creds *creds,
 640              const krb5_addresses *addrs,
 641              const krb5_enctype *etypes,
 642              const krb5_preauthtype *ptypes,
 643              const krb5_preauthdata *preauth,
 644              krb5_key_proc key_proc,
 645              krb5_const_pointer keyseed,
 646              unsigned nonce,
 647              AS_REQ *a)
 648 {
 649     krb5_error_code ret;
 650     krb5_salt salt;
 651
 652     memset(a, 0, sizeof(*a));
 653
 654     a->pvno = 5;
 655     a->msg_type = krb_as_req;
 656     a->req_body.kdc_options = opts;
 657     a->req_body.cname = malloc(sizeof(*a->req_body.cname));
 658     if (a->req_body.cname == NULL) {
 659         ret = ENOMEM;
 660         krb5_set_error_string(context, "malloc: out of memory");
 661         goto fail;
 662     }
 663     a->req_body.sname = malloc(sizeof(*a->req_body.sname));
 664     if (a->req_body.sname == NULL) {
 665         ret = ENOMEM;
 666         krb5_set_error_string(context, "malloc: out of memory");
 667         goto fail;
 668     }
 669     ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
 670     if (ret)
 671         goto fail;
 672     ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
 673     if (ret)
 674         goto fail;
 675     ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
 676     if (ret)
 677         goto fail;
 678
 679     if(creds->times.starttime) {
 680         a->req_body.from = malloc(sizeof(*a->req_body.from));
 681         if (a->req_body.from == NULL) {
 682             ret = ENOMEM;
 683             krb5_set_error_string(context, "malloc: out of memory");
 684             goto fail;
 685         }
 686         *a->req_body.from = creds->times.starttime;
 687     }
 688     if(creds->times.endtime){
 689         ALLOC(a->req_body.till, 1);
 690         *a->req_body.till = creds->times.endtime;
 691     }
 692     if(creds->times.renew_till){
 693         a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
 694         if (a->req_body.rtime == NULL) {
 695             ret = ENOMEM;
 696             krb5_set_error_string(context, "malloc: out of memory");
 697             goto fail;
 698         }
 699         *a->req_body.rtime = creds->times.renew_till;
 700     }
 701     a->req_body.nonce = nonce;
 702     ret = krb5_init_etype (context,
 703                            &a->req_body.etype.len,
 704                            &a->req_body.etype.val,
 705                            etypes);
 706     if (ret)
 707         goto fail;
 708
 709     /*
 710      * This means no addresses
 711      */
 712
 713     if (addrs && addrs->len == 0) {
 714         a->req_body.addresses = NULL;
 715     } else {
 716         a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
 717         if (a->req_body.addresses == NULL) {
 718             ret = ENOMEM;
 719             krb5_set_error_string(context, "malloc: out of memory");
 720             goto fail;
 721         }
 722
 723         if (addrs)
 724             ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
 725         else {
 726             ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
 727             if(ret == 0 && a->req_body.addresses->len == 0) {
 728                 free(a->req_body.addresses);
 729                 a->req_body.addresses = NULL;
 730             }
 731         }
 732         if (ret)
 733             return ret;
 734     }
 735
 736     a->req_body.enc_authorization_data = NULL;
 737     a->req_body.additional_tickets = NULL;
 738
 739     if(preauth != NULL) {
 740         int i;
 741         ALLOC(a->padata, 1);
 742         if(a->padata == NULL) {
 743             ret = ENOMEM;
 744             krb5_set_error_string(context, "malloc: out of memory");
 745             goto fail;
 746         }
 747         a->padata->val = NULL;
 748         a->padata->len = 0;
 749         for(i = 0; i < preauth->len; i++) {
 750             if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
 751                 int j;
 752
 753                 for(j = 0; j < preauth->val[i].info.len; j++) {
 754                     krb5_salt *sp = &salt;
 755                     if(preauth->val[i].info.val[j].salttype)
 756                         salt.salttype = *preauth->val[i].info.val[j].salttype;
 757                     else
 758                         salt.salttype = KRB5_PW_SALT;
 759                     if(preauth->val[i].info.val[j].salt)
 760                         salt.saltvalue = *preauth->val[i].info.val[j].salt;
 761                     else
 762                         if(salt.salttype == KRB5_PW_SALT)
 763                             sp = NULL;
 764                         else
 765                             krb5_data_zero(&salt.saltvalue);
 766                     ret = add_padata(context, a->padata, creds->client,
 767                                      key_proc, keyseed,
 768                                      &preauth->val[i].info.val[j].etype, 1,
 769                                      sp);
 770                     if (ret == 0)
 771                         break;
 772                 }
 773             }
 774         }
 775     } else
 776     /* not sure this is the way to use `ptypes' */
 777     if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
 778         a->padata = NULL;
 779     else if (*ptypes ==  KRB5_PADATA_ENC_TIMESTAMP) {
 780         ALLOC(a->padata, 1);
 781         if (a->padata == NULL) {
 782             ret = ENOMEM;
 783             krb5_set_error_string(context, "malloc: out of memory");
 784             goto fail;
 785         }
 786         a->padata->len = 0;
 787         a->padata->val = NULL;
 788
 789         /* make a v5 salted pa-data */
 790         add_padata(context, a->padata, creds->client,
 791                    key_proc, keyseed, a->req_body.etype.val,
 792                    a->req_body.etype.len, NULL);
 793
 794         /* make a v4 salted pa-data */
 795         salt.salttype = KRB5_PW_SALT;
 796         krb5_data_zero(&salt.saltvalue);
 797         add_padata(context, a->padata, creds->client,
 798                    key_proc, keyseed, a->req_body.etype.val,
 799                    a->req_body.etype.len, &salt);
 800     } else {
 801         krb5_set_error_string (context, "pre-auth type %d not supported",
 802                                *ptypes);
 803         ret = KRB5_PREAUTH_BAD_TYPE;
 804         goto fail;
 805     }
 806     return 0;
 807 fail:
 808     free_AS_REQ(a);
 809     return ret;
 810 }
 811
 812 static int
 813 set_ptypes(krb5_context context,
 814            KRB_ERROR *error,
 815            const krb5_preauthtype **ptypes,
 816            krb5_preauthdata **preauth)
 817 {
 818     static krb5_preauthdata preauth2;
 819     static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE };
 820
 821     if(error->e_data) {
 822         METHOD_DATA md;
 823         int i;
 824         decode_METHOD_DATA(error->e_data->data,
 825                            error->e_data->length,
 826                            &md,
 827                            NULL);
 828         for(i = 0; i < md.len; i++){
 829             switch(md.val[i].padata_type){
 830             case KRB5_PADATA_ENC_TIMESTAMP:
 831                 *ptypes = ptypes2;
 832                 break;
 833             case KRB5_PADATA_ETYPE_INFO:
 834                 *preauth = &preauth2;
 835                 ALLOC_SEQ(*preauth, 1);
 836                 (*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
 837                 krb5_decode_ETYPE_INFO(context,
 838                                        md.val[i].padata_value.data,
 839                                        md.val[i].padata_value.length,
 840                                        &(*preauth)->val[0].info,
 841                                        NULL);
 842                 break;
 843             default:
 844                 break;
 845             }
 846         }
 847         free_METHOD_DATA(&md);
 848     } else {
 849         *ptypes = ptypes2;
 850     }
 851     return(1);
 852 }
 853
 854 krb5_error_code KRB5_LIB_FUNCTION
 855 krb5_get_in_cred(krb5_context context,
 856                  krb5_flags options,
 857                  const krb5_addresses *addrs,
 858                  const krb5_enctype *etypes,
 859                  const krb5_preauthtype *ptypes,
 860                  const krb5_preauthdata *preauth,
 861                  krb5_key_proc key_proc,
 862                  krb5_const_pointer keyseed,
 863                  krb5_decrypt_proc decrypt_proc,
 864                  krb5_const_pointer decryptarg,
 865                  krb5_creds *creds,
 866                  krb5_kdc_rep *ret_as_reply)
 867 {
 868     krb5_error_code ret;
 869     AS_REQ a;
 870     krb5_kdc_rep rep;
 871     krb5_data req, resp;
 872     size_t len;
 873     krb5_salt salt;
 874     krb5_keyblock *key;
 875     size_t size;
 876     KDCOptions opts;
 877     PA_DATA *pa;
 878     krb5_enctype etype;
 879     krb5_preauthdata *my_preauth = NULL;
 880     unsigned nonce;
 881     int done;
 882
 883     opts = int2KDCOptions(options);
 884
 885     krb5_generate_random_block (&nonce, sizeof(nonce));
 886     nonce &= 0xffffffff;
 887
 888     do {
 889         done = 1;
 890         ret = init_as_req (context,
 891                            opts,
 892                            creds,
 893                            addrs,
 894                            etypes,
 895                            ptypes,
 896                            preauth,
 897                            key_proc,
 898                            keyseed,
 899                            nonce,
 900                            &a);
 901         if (my_preauth) {
 902             free_ETYPE_INFO(&my_preauth->val[0].info);
 903             free (my_preauth->val);
 904             my_preauth = NULL;
 905         }
 906         if (ret)
 907             return ret;
 908
 909         ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
 910         free_AS_REQ(&a);
 911         if (ret)
 912             return ret;
 913         if(len != req.length)
 914             krb5_abortx(context, "internal error in ASN.1 encoder");
 915
 916         ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
 917         krb5_data_free(&req);
 918         if (ret)
 919             return ret;
 920
 921         memset (&rep, 0, sizeof(rep));
 922         ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
 923         if(ret) {
 924             /* let's try to parse it as a KRB-ERROR */
 925             KRB_ERROR error;
 926             int ret2;
 927
 928             ret2 = krb5_rd_error(context, &resp, &error);
 929             if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
 930                 ret = KRB5KRB_AP_ERR_V4_REPLY;
 931             krb5_data_free(&resp);
 932             if (ret2 == 0) {
 933                 ret = krb5_error_from_rd_error(context, &error, creds);
 934                 /* if no preauth was set and KDC requires it, give it
 935                    one more try */
 936                 if (!ptypes && !preauth
 937                     && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
 938 #if 0
 939                         || ret == KRB5KDC_ERR_BADOPTION
 940 #endif
 941                     && set_ptypes(context, &error, &ptypes, &my_preauth)) {
 942                     done = 0;
 943                     preauth = my_preauth;
 944                     krb5_free_error_contents(context, &error);
 945                     krb5_clear_error_string(context);
 946                     continue;
 947                 }
 948                 if(ret_as_reply)
 949                     ret_as_reply->error = error;
 950                 else
 951                     free_KRB_ERROR (&error);
 952                 return ret;
 953             }
 954             return ret;
 955         }
 956         krb5_data_free(&resp);
 957     } while(!done);
 958
 959     pa = NULL;
 960     etype = rep.kdc_rep.enc_part.etype;
 961     if(rep.kdc_rep.padata){
 962         int i = 0;
 963         pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len,
 964                               KRB5_PADATA_PW_SALT, &i);
 965         if(pa == NULL) {
 966             i = 0;
 967             pa = krb5_find_padata(rep.kdc_rep.padata->val,
 968                                   rep.kdc_rep.padata->len,
 969                                   KRB5_PADATA_AFS3_SALT, &i);
 970         }
 971     }
 972     if(pa) {
 973         salt.salttype = pa->padata_type;
 974         salt.saltvalue = pa->padata_value;
 975
 976         ret = (*key_proc)(context, etype, salt, keyseed, &key);
 977     } else {
 978         /* make a v5 salted pa-data */
 979         ret = krb5_get_pw_salt (context, creds->client, &salt);
 980
 981         if (ret)
 982             goto out;
 983         ret = (*key_proc)(context, etype, salt, keyseed, &key);
 984         krb5_free_salt(context, salt);
 985     }
 986     if (ret)
 987         goto out;
 988
 989     {
 990         unsigned flags = 0;
 991         if (opts.request_anonymous)
 992             flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
 993
 994         ret = _krb5_extract_ticket(context,
 995                                    &rep,
 996                                    creds,
 997                                    key,
 998                                    keyseed,
 999                                    KRB5_KU_AS_REP_ENC_PART,
1000                                    NULL,
1001                                    nonce,
1002                                    flags,
1003                                    decrypt_proc,
1004                                    decryptarg);
1005     }
1006     memset (key->keyvalue.data, 0, key->keyvalue.length);
1007     krb5_free_keyblock_contents (context, key);
1008     free (key);
1009
1010 out:
1011     if (ret == 0 && ret_as_reply)
1012         *ret_as_reply = rep;
1013     else
1014         krb5_free_kdc_rep (context, &rep);
1015     return ret;
1016 }
1017
1018 krb5_error_code KRB5_LIB_FUNCTION
1019 krb5_get_in_tkt(krb5_context context,
1020                 krb5_flags options,
1021                 const krb5_addresses *addrs,
1022                 const krb5_enctype *etypes,
1023                 const krb5_preauthtype *ptypes,
1024                 krb5_key_proc key_proc,
1025                 krb5_const_pointer keyseed,
1026                 krb5_decrypt_proc decrypt_proc,
1027                 krb5_const_pointer decryptarg,
1028                 krb5_creds *creds,
1029                 krb5_ccache ccache,
1030                 krb5_kdc_rep *ret_as_reply)
1031 {
1032     krb5_error_code ret;
1033
1034     ret = krb5_get_in_cred (context,
1035                             options,
1036                             addrs,
1037                             etypes,
1038                             ptypes,
1039                             NULL,
1040                             key_proc,
1041                             keyseed,
1042                             decrypt_proc,
1043                             decryptarg,
1044                             creds,
1045                             ret_as_reply);
1046     if(ret)
1047         return ret;
1048     if (ccache)
1049         ret = krb5_cc_store_cred (context, ccache, creds);
1050     return ret;
1051 }