lib/krb5/get_cred.c

   1 /*
   2  * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Portions Copyright (c) 2009 Apple Inc. 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 #include "krb5_locl.h"
  37 #include <assert.h>
  38
  39 /*
  40  * Take the `body' and encode it into `padata' using the credentials
  41  * in `creds'.
  42  */
  43
  44 static krb5_error_code
  45 make_pa_tgs_req(krb5_context context,
  46                 krb5_auth_context ac,
  47                 KDC_REQ_BODY *body,
  48                 PA_DATA *padata,
  49                 krb5_creds *creds)
  50 {
  51     u_char *buf;
  52     size_t buf_size;
  53     size_t len;
  54     krb5_data in_data;
  55     krb5_error_code ret;
  56
  57     ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret);
  58     if (ret)
  59         goto out;
  60     if(buf_size != len)
  61         krb5_abortx(context, "internal error in ASN.1 encoder");
  62
  63     in_data.length = len;
  64     in_data.data   = buf;
  65     ret = _krb5_mk_req_internal(context, &ac, 0, &in_data, creds,
  66                                 &padata->padata_value,
  67                                 KRB5_KU_TGS_REQ_AUTH_CKSUM,
  68                                 KRB5_KU_TGS_REQ_AUTH);
  69  out:
  70     free (buf);
  71     if(ret)
  72         return ret;
  73     padata->padata_type = KRB5_PADATA_TGS_REQ;
  74     return 0;
  75 }
  76
  77 /*
  78  * Set the `enc-authorization-data' in `req_body' based on `authdata'
  79  */
  80
  81 static krb5_error_code
  82 set_auth_data (krb5_context context,
  83                KDC_REQ_BODY *req_body,
  84                krb5_authdata *authdata,
  85                krb5_keyblock *subkey)
  86 {
  87     if(authdata->len) {
  88         size_t len, buf_size;
  89         unsigned char *buf;
  90         krb5_crypto crypto;
  91         krb5_error_code ret;
  92
  93         ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata,
  94                            &len, ret);
  95         if (ret)
  96             return ret;
  97         if (buf_size != len)
  98             krb5_abortx(context, "internal error in ASN.1 encoder");
  99
 100         ALLOC(req_body->enc_authorization_data, 1);
 101         if (req_body->enc_authorization_data == NULL) {
 102             free (buf);
 103             krb5_set_error_message(context, ENOMEM,
 104                                    N_("malloc: out of memory", ""));
 105             return ENOMEM;
 106         }
 107         ret = krb5_crypto_init(context, subkey, 0, &crypto);
 108         if (ret) {
 109             free (buf);
 110             free (req_body->enc_authorization_data);
 111             req_body->enc_authorization_data = NULL;
 112             return ret;
 113         }
 114         krb5_encrypt_EncryptedData(context,
 115                                    crypto,
 116                                    KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY,
 117                                    buf,
 118                                    len,
 119                                    0,
 120                                    req_body->enc_authorization_data);
 121         free (buf);
 122         krb5_crypto_destroy(context, crypto);
 123     } else {
 124         req_body->enc_authorization_data = NULL;
 125     }
 126     return 0;
 127 }
 128
 129 /*
 130  * Create a tgs-req in `t' with `addresses', `flags', `second_ticket'
 131  * (if not-NULL), `in_creds', `krbtgt', and returning the generated
 132  * subkey in `subkey'.
 133  */
 134
 135 static krb5_error_code
 136 init_tgs_req (krb5_context context,
 137               krb5_ccache ccache,
 138               krb5_addresses *addresses,
 139               krb5_kdc_flags flags,
 140               Ticket *second_ticket,
 141               krb5_creds *in_creds,
 142               krb5_creds *krbtgt,
 143               unsigned nonce,
 144               const METHOD_DATA *padata,
 145               krb5_keyblock **subkey,
 146               TGS_REQ *t)
 147 {
 148     krb5_auth_context ac = NULL;
 149     krb5_error_code ret = 0;
 150
 151     memset(t, 0, sizeof(*t));
 152     t->pvno = 5;
 153     t->msg_type = krb_tgs_req;
 154     if (in_creds->session.keytype) {
 155         ALLOC_SEQ(&t->req_body.etype, 1);
 156         if(t->req_body.etype.val == NULL) {
 157             ret = ENOMEM;
 158             krb5_set_error_message(context, ret,
 159                                    N_("malloc: out of memory", ""));
 160             goto fail;
 161         }
 162         t->req_body.etype.val[0] = in_creds->session.keytype;
 163     } else {
 164         ret = krb5_init_etype(context,
 165                               &t->req_body.etype.len,
 166                               &t->req_body.etype.val,
 167                               NULL);
 168     }
 169     if (ret)
 170         goto fail;
 171     t->req_body.addresses = addresses;
 172     t->req_body.kdc_options = flags.b;
 173     ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
 174     if (ret)
 175         goto fail;
 176     ALLOC(t->req_body.sname, 1);
 177     if (t->req_body.sname == NULL) {
 178         ret = ENOMEM;
 179         krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
 180         goto fail;
 181     }
 182
 183     /* some versions of some code might require that the client be
 184        present in TGS-REQs, but this is clearly against the spec */
 185
 186     ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
 187     if (ret)
 188         goto fail;
 189
 190     /* req_body.till should be NULL if there is no endtime specified,
 191        but old MIT code (like DCE secd) doesn't like that */
 192     ALLOC(t->req_body.till, 1);
 193     if(t->req_body.till == NULL){
 194         ret = ENOMEM;
 195         krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
 196         goto fail;
 197     }
 198     *t->req_body.till = in_creds->times.endtime;
 199
 200     t->req_body.nonce = nonce;
 201     if(second_ticket){
 202         ALLOC(t->req_body.additional_tickets, 1);
 203         if (t->req_body.additional_tickets == NULL) {
 204             ret = ENOMEM;
 205             krb5_set_error_message(context, ret,
 206                                    N_("malloc: out of memory", ""));
 207             goto fail;
 208         }
 209         ALLOC_SEQ(t->req_body.additional_tickets, 1);
 210         if (t->req_body.additional_tickets->val == NULL) {
 211             ret = ENOMEM;
 212             krb5_set_error_message(context, ret,
 213                                    N_("malloc: out of memory", ""));
 214             goto fail;
 215         }
 216         ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
 217         if (ret)
 218             goto fail;
 219     }
 220     ALLOC(t->padata, 1);
 221     if (t->padata == NULL) {
 222         ret = ENOMEM;
 223         krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
 224         goto fail;
 225     }
 226     ALLOC_SEQ(t->padata, 1 + padata->len);
 227     if (t->padata->val == NULL) {
 228         ret = ENOMEM;
 229         krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
 230         goto fail;
 231     }
 232     {
 233         int i;
 234         for (i = 0; i < padata->len; i++) {
 235             ret = copy_PA_DATA(&padata->val[i], &t->padata->val[i + 1]);
 236             if (ret) {
 237                 krb5_set_error_message(context, ret,
 238                                        N_("malloc: out of memory", ""));
 239                 goto fail;
 240             }
 241         }
 242     }
 243
 244     ret = krb5_auth_con_init(context, &ac);
 245     if(ret)
 246         goto fail;
 247
 248     ret = krb5_auth_con_generatelocalsubkey(context, ac, &krbtgt->session);
 249     if (ret)
 250         goto fail;
 251
 252     ret = set_auth_data (context, &t->req_body, &in_creds->authdata,
 253                          ac->local_subkey);
 254     if (ret)
 255         goto fail;
 256
 257     ret = make_pa_tgs_req(context,
 258                           ac,
 259                           &t->req_body,
 260                           &t->padata->val[0],
 261                           krbtgt);
 262     if(ret)
 263         goto fail;
 264
 265     ret = krb5_auth_con_getlocalsubkey(context, ac, subkey);
 266     if (ret)
 267         goto fail;
 268
 269 fail:
 270     if (ac)
 271         krb5_auth_con_free(context, ac);
 272     if (ret) {
 273         t->req_body.addresses = NULL;
 274         free_TGS_REQ (t);
 275     }
 276     return ret;
 277 }
 278
 279 krb5_error_code
 280 _krb5_get_krbtgt(krb5_context context,
 281                  krb5_ccache  id,
 282                  krb5_realm realm,
 283                  krb5_creds **cred)
 284 {
 285     krb5_error_code ret;
 286     krb5_creds tmp_cred;
 287
 288     memset(&tmp_cred, 0, sizeof(tmp_cred));
 289
 290     ret = krb5_cc_get_principal(context, id, &tmp_cred.client);
 291     if (ret)
 292         return ret;
 293
 294     ret = krb5_make_principal(context,
 295                               &tmp_cred.server,
 296                               realm,
 297                               KRB5_TGS_NAME,
 298                               realm,
 299                               NULL);
 300     if(ret) {
 301         krb5_free_principal(context, tmp_cred.client);
 302         return ret;
 303     }
 304     ret = krb5_get_credentials(context,
 305                                KRB5_GC_CACHED,
 306                                id,
 307                                &tmp_cred,
 308                                cred);
 309     krb5_free_principal(context, tmp_cred.client);
 310     krb5_free_principal(context, tmp_cred.server);
 311     if(ret)
 312         return ret;
 313     return 0;
 314 }
 315
 316 /* DCE compatible decrypt proc */
 317 static krb5_error_code KRB5_CALLCONV
 318 decrypt_tkt_with_subkey (krb5_context context,
 319                          krb5_keyblock *key,
 320                          krb5_key_usage usage,
 321                          krb5_const_pointer subkey,
 322                          krb5_kdc_rep *dec_rep)
 323 {
 324     krb5_error_code ret;
 325     krb5_data data;
 326     size_t size;
 327     krb5_crypto crypto;
 328
 329     assert(usage == 0);
 330
 331     /*
 332      * start out with trying with subkey if we have one
 333      */
 334     if (subkey) {
 335         ret = krb5_crypto_init(context, subkey, 0, &crypto);
 336         if (ret)
 337             return ret;
 338         ret = krb5_decrypt_EncryptedData (context,
 339                                           crypto,
 340                                           KRB5_KU_TGS_REP_ENC_PART_SUB_KEY,
 341                                           &dec_rep->kdc_rep.enc_part,
 342                                           &data);
 343         krb5_crypto_destroy(context, crypto);
 344     }
 345     if (subkey == NULL || ret) {
 346         ret = krb5_crypto_init(context, key, 0, &crypto);
 347         if (ret)
 348             return ret;
 349         ret = krb5_decrypt_EncryptedData (context,
 350                                           crypto,
 351                                           KRB5_KU_TGS_REP_ENC_PART_SESSION,
 352                                           &dec_rep->kdc_rep.enc_part,
 353                                           &data);
 354         krb5_crypto_destroy(context, crypto);
 355     }
 356     if (ret)
 357         return ret;
 358
 359     ret = decode_EncASRepPart(data.data,
 360                               data.length,
 361                               &dec_rep->enc_part,
 362                               &size);
 363     if (ret)
 364         ret = decode_EncTGSRepPart(data.data,
 365                                    data.length,
 366                                    &dec_rep->enc_part,
 367                                    &size);
 368     if (ret)
 369       krb5_set_error_message(context, ret,
 370                              N_("Failed to decode encpart in ticket", ""));
 371     krb5_data_free (&data);
 372     return ret;
 373 }
 374
 375 static krb5_error_code
 376 get_cred_kdc(krb5_context context,
 377              krb5_ccache id,
 378              krb5_kdc_flags flags,
 379              krb5_addresses *addresses,
 380              krb5_creds *in_creds,
 381              krb5_creds *krbtgt,
 382              krb5_principal impersonate_principal,
 383              Ticket *second_ticket,
 384              krb5_creds *out_creds)
 385 {
 386     TGS_REQ req;
 387     krb5_data enc;
 388     krb5_data resp;
 389     krb5_kdc_rep rep;
 390     KRB_ERROR error;
 391     krb5_error_code ret;
 392     unsigned nonce;
 393     krb5_keyblock *subkey = NULL;
 394     size_t len;
 395     Ticket second_ticket_data;
 396     METHOD_DATA padata;
 397
 398     krb5_data_zero(&resp);
 399     krb5_data_zero(&enc);
 400     padata.val = NULL;
 401     padata.len = 0;
 402
 403     krb5_generate_random_block(&nonce, sizeof(nonce));
 404     nonce &= 0xffffffff;
 405
 406     if(flags.b.enc_tkt_in_skey && second_ticket == NULL){
 407         ret = decode_Ticket(in_creds->second_ticket.data,
 408                             in_creds->second_ticket.length,
 409                             &second_ticket_data, &len);
 410         if(ret)
 411             return ret;
 412         second_ticket = &second_ticket_data;
 413     }
 414
 415
 416     if (impersonate_principal) {
 417         krb5_crypto crypto;
 418         PA_S4U2Self self;
 419         krb5_data data;
 420         void *buf;
 421         size_t size;
 422
 423         self.name = impersonate_principal->name;
 424         self.realm = impersonate_principal->realm;
 425         self.auth = estrdup("Kerberos");
 426
 427         ret = _krb5_s4u2self_to_checksumdata(context, &self, &data);
 428         if (ret) {
 429             free(self.auth);
 430             goto out;
 431         }
 432
 433         ret = krb5_crypto_init(context, &krbtgt->session, 0, &crypto);
 434         if (ret) {
 435             free(self.auth);
 436             krb5_data_free(&data);
 437             goto out;
 438         }
 439
 440         ret = krb5_create_checksum(context,
 441                                    crypto,
 442                                    KRB5_KU_OTHER_CKSUM,
 443                                    0,
 444                                    data.data,
 445                                    data.length,
 446                                    &self.cksum);
 447         krb5_crypto_destroy(context, crypto);
 448         krb5_data_free(&data);
 449         if (ret) {
 450             free(self.auth);
 451             goto out;
 452         }
 453
 454         ASN1_MALLOC_ENCODE(PA_S4U2Self, buf, len, &self, &size, ret);
 455         free(self.auth);
 456         free_Checksum(&self.cksum);
 457         if (ret)
 458             goto out;
 459         if (len != size)
 460             krb5_abortx(context, "internal asn1 error");
 461
 462         ret = krb5_padata_add(context, &padata, KRB5_PADATA_FOR_USER, buf, len);
 463         if (ret)
 464             goto out;
 465     }
 466
 467     ret = init_tgs_req (context,
 468                         id,
 469                         addresses,
 470                         flags,
 471                         second_ticket,
 472                         in_creds,
 473                         krbtgt,
 474                         nonce,
 475                         &padata,
 476                         &subkey,
 477                         &req);
 478     if (ret)
 479         goto out;
 480
 481     ASN1_MALLOC_ENCODE(TGS_REQ, enc.data, enc.length, &req, &len, ret);
 482     if (ret)
 483         goto out;
 484     if(enc.length != len)
 485         krb5_abortx(context, "internal error in ASN.1 encoder");
 486
 487     /* don't free addresses */
 488     req.req_body.addresses = NULL;
 489     free_TGS_REQ(&req);
 490
 491     /*
 492      * Send and receive
 493      */
 494     {
 495         krb5_sendto_ctx stctx;
 496         ret = krb5_sendto_ctx_alloc(context, &stctx);
 497         if (ret)
 498             return ret;
 499         krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
 500
 501         ret = krb5_sendto_context (context, stctx, &enc,
 502                                    krbtgt->server->name.name_string.val[1],
 503                                    &resp);
 504         krb5_sendto_ctx_free(context, stctx);
 505     }
 506     if(ret)
 507         goto out;
 508
 509     memset(&rep, 0, sizeof(rep));
 510     if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0) {
 511         unsigned eflags = 0;
 512
 513         ret = krb5_copy_principal(context,
 514                                   in_creds->client,
 515                                   &out_creds->client);
 516         if(ret)
 517             goto out2;
 518         ret = krb5_copy_principal(context,
 519                                   in_creds->server,
 520                                   &out_creds->server);
 521         if(ret)
 522             goto out2;
 523         /* this should go someplace else */
 524         out_creds->times.endtime = in_creds->times.endtime;
 525
 526         /* XXX should do better testing */
 527         if (flags.b.constrained_delegation || impersonate_principal)
 528             eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
 529
 530         ret = _krb5_extract_ticket(context,
 531                                    &rep,
 532                                    out_creds,
 533                                    &krbtgt->session,
 534                                    NULL,
 535                                    0,
 536                                    &krbtgt->addresses,
 537                                    nonce,
 538                                    eflags,
 539                                    decrypt_tkt_with_subkey,
 540                                    subkey);
 541     out2:
 542         krb5_free_kdc_rep(context, &rep);
 543     } else if(krb5_rd_error(context, &resp, &error) == 0) {
 544         ret = krb5_error_from_rd_error(context, &error, in_creds);
 545         krb5_free_error_contents(context, &error);
 546     } else if(resp.length > 0 && ((char*)resp.data)[0] == 4) {
 547         ret = KRB5KRB_AP_ERR_V4_REPLY;
 548         krb5_clear_error_message(context);
 549     } else {
 550         ret = KRB5KRB_AP_ERR_MSG_TYPE;
 551         krb5_clear_error_message(context);
 552     }
 553
 554 out:
 555     if (second_ticket == &second_ticket_data)
 556         free_Ticket(&second_ticket_data);
 557     free_METHOD_DATA(&padata);
 558     krb5_data_free(&resp);
 559     krb5_data_free(&enc);
 560     if(subkey)
 561         krb5_free_keyblock(context, subkey);
 562     return ret;
 563
 564 }
 565
 566 /*
 567  * same as above, just get local addresses first if the krbtgt have
 568  * them and the realm is not addressless
 569  */
 570
 571 static krb5_error_code
 572 get_cred_kdc_address(krb5_context context,
 573                      krb5_ccache id,
 574                      krb5_kdc_flags flags,
 575                      krb5_addresses *addrs,
 576                      krb5_creds *in_creds,
 577                      krb5_creds *krbtgt,
 578                      krb5_principal impersonate_principal,
 579                      Ticket *second_ticket,
 580                      krb5_creds *out_creds)
 581 {
 582     krb5_error_code ret;
 583     krb5_addresses addresses = { 0, NULL };
 584
 585     /*
 586      * Inherit the address-ness of the krbtgt if the address is not
 587      * specified.
 588      */
 589
 590     if (addrs == NULL && krbtgt->addresses.len != 0) {
 591         krb5_boolean noaddr;
 592
 593         krb5_appdefault_boolean(context, NULL, krbtgt->server->realm,
 594                                 "no-addresses", FALSE, &noaddr);
 595
 596         if (!noaddr) {
 597             krb5_get_all_client_addrs(context, &addresses);
 598             /* XXX this sucks. */
 599             addrs = &addresses;
 600             if(addresses.len == 0)
 601                 addrs = NULL;
 602         }
 603     }
 604     ret = get_cred_kdc(context, id, flags, addrs, in_creds,
 605                        krbtgt, impersonate_principal,
 606                        second_ticket, out_creds);
 607     krb5_free_addresses(context, &addresses);
 608     return ret;
 609 }
 610
 611 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 612 krb5_get_kdc_cred(krb5_context context,
 613                   krb5_ccache id,
 614                   krb5_kdc_flags flags,
 615                   krb5_addresses *addresses,
 616                   Ticket  *second_ticket,
 617                   krb5_creds *in_creds,
 618                   krb5_creds **out_creds
 619                   )
 620 {
 621     krb5_error_code ret;
 622     krb5_creds *krbtgt;
 623
 624     *out_creds = calloc(1, sizeof(**out_creds));
 625     if(*out_creds == NULL) {
 626         krb5_set_error_message(context, ENOMEM,
 627                                N_("malloc: out of memory", ""));
 628         return ENOMEM;
 629     }
 630     ret = _krb5_get_krbtgt (context,
 631                             id,
 632                             in_creds->server->realm,
 633                             &krbtgt);
 634     if(ret) {
 635         free(*out_creds);
 636         *out_creds = NULL;
 637         return ret;
 638     }
 639     ret = get_cred_kdc(context, id, flags, addresses,
 640                        in_creds, krbtgt, NULL, NULL, *out_creds);
 641     krb5_free_creds (context, krbtgt);
 642     if(ret) {
 643         free(*out_creds);
 644         *out_creds = NULL;
 645     }
 646     return ret;
 647 }
 648
 649 static int
 650 not_found(krb5_context context, krb5_const_principal p, krb5_error_code code)
 651 {
 652     krb5_error_code ret;
 653     char *str;
 654
 655     ret = krb5_unparse_name(context, p, &str);
 656     if(ret) {
 657         krb5_clear_error_message(context);
 658         return code;
 659     }
 660     krb5_set_error_message(context, code,
 661                            N_("Matching credential (%s) not found", ""), str);
 662     free(str);
 663     return code;
 664 }
 665
 666 static krb5_error_code
 667 find_cred(krb5_context context,
 668           krb5_ccache id,
 669           krb5_principal server,
 670           krb5_creds **tgts,
 671           krb5_creds *out_creds)
 672 {
 673     krb5_error_code ret;
 674     krb5_creds mcreds;
 675
 676     krb5_cc_clear_mcred(&mcreds);
 677     mcreds.server = server;
 678     ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_DONT_MATCH_REALM,
 679                                 &mcreds, out_creds);
 680     if(ret == 0)
 681         return 0;
 682     while(tgts && *tgts){
 683         if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM,
 684                               &mcreds, *tgts)){
 685             ret = krb5_copy_creds_contents(context, *tgts, out_creds);
 686             return ret;
 687         }
 688         tgts++;
 689     }
 690     return not_found(context, server, KRB5_CC_NOTFOUND);
 691 }
 692
 693 static krb5_error_code
 694 add_cred(krb5_context context, krb5_creds const *tkt, krb5_creds ***tgts)
 695 {
 696     int i;
 697     krb5_error_code ret;
 698     krb5_creds **tmp = *tgts;
 699
 700     for(i = 0; tmp && tmp[i]; i++); /* XXX */
 701     tmp = realloc(tmp, (i+2)*sizeof(*tmp));
 702     if(tmp == NULL) {
 703         krb5_set_error_message(context, ENOMEM,
 704                                N_("malloc: out of memory", ""));
 705         return ENOMEM;
 706     }
 707     *tgts = tmp;
 708     ret = krb5_copy_creds(context, tkt, &tmp[i]);
 709     tmp[i+1] = NULL;
 710     return ret;
 711 }
 712
 713 /*
 714 get_cred(server)
 715         creds = cc_get_cred(server)
 716         if(creds) return creds
 717         tgt = cc_get_cred(krbtgt/server_realm@any_realm)
 718         if(tgt)
 719                 return get_cred_tgt(server, tgt)
 720         if(client_realm == server_realm)
 721                 return NULL
 722         tgt = get_cred(krbtgt/server_realm@client_realm)
 723         while(tgt_inst != server_realm)
 724                 tgt = get_cred(krbtgt/server_realm@tgt_inst)
 725         return get_cred_tgt(server, tgt)
 726         */
 727
 728 static krb5_error_code
 729 get_cred_kdc_capath(krb5_context context,
 730                     krb5_kdc_flags flags,
 731                     krb5_ccache ccache,
 732                     krb5_creds *in_creds,
 733                     krb5_principal impersonate_principal,
 734                     Ticket *second_ticket,
 735                     krb5_creds **out_creds,
 736                     krb5_creds ***ret_tgts)
 737 {
 738     krb5_error_code ret;
 739     krb5_creds *tgt, tmp_creds;
 740     krb5_const_realm client_realm, server_realm, try_realm;
 741     int ok_as_delegate = 1;
 742
 743     *out_creds = NULL;
 744
 745     client_realm = krb5_principal_get_realm(context, in_creds->client);
 746     server_realm = krb5_principal_get_realm(context, in_creds->server);
 747     memset(&tmp_creds, 0, sizeof(tmp_creds));
 748     ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
 749     if(ret)
 750         return ret;
 751
 752     try_realm = krb5_config_get_string(context, NULL, "capaths",
 753                                        client_realm, server_realm, NULL);
 754     if (try_realm == NULL)
 755         try_realm = client_realm;
 756
 757     ret = krb5_make_principal(context,
 758                               &tmp_creds.server,
 759                               try_realm,
 760                               KRB5_TGS_NAME,
 761                               server_realm,
 762                               NULL);
 763     if(ret){
 764         krb5_free_principal(context, tmp_creds.client);
 765         return ret;
 766     }
 767     {
 768         krb5_creds tgts;
 769
 770         ret = find_cred(context, ccache, tmp_creds.server,
 771                         *ret_tgts, &tgts);
 772         if(ret == 0){
 773             if (try_realm != client_realm)
 774                 ok_as_delegate = tgts.flags.b.ok_as_delegate;
 775
 776             *out_creds = calloc(1, sizeof(**out_creds));
 777             if(*out_creds == NULL) {
 778                 ret = ENOMEM;
 779                 krb5_set_error_message(context, ret,
 780                                        N_("malloc: out of memory", ""));
 781             } else {
 782                 ret = get_cred_kdc_address(context, ccache, flags, NULL,
 783                                            in_creds, &tgts,
 784                                            impersonate_principal,
 785                                            second_ticket,
 786                                            *out_creds);
 787                 if (ret) {
 788                     free (*out_creds);
 789                     *out_creds = NULL;
 790                 } else if (ok_as_delegate == 0)
 791                     (*out_creds)->flags.b.ok_as_delegate = 0;
 792             }
 793             krb5_free_cred_contents(context, &tgts);
 794             krb5_free_principal(context, tmp_creds.server);
 795             krb5_free_principal(context, tmp_creds.client);
 796             return ret;
 797         }
 798     }
 799     if(krb5_realm_compare(context, in_creds->client, in_creds->server))
 800         return not_found(context, in_creds->server, KRB5_CC_NOTFOUND);
 801
 802     /* XXX this can loop forever */
 803     while(1){
 804         heim_general_string tgt_inst;
 805
 806         ret = get_cred_kdc_capath(context, flags, ccache, &tmp_creds,
 807                                   NULL, NULL, &tgt, ret_tgts);
 808         if(ret) {
 809             krb5_free_principal(context, tmp_creds.server);
 810             krb5_free_principal(context, tmp_creds.client);
 811             return ret;
 812         }
 813         /*
 814          * if either of the chain or the ok_as_delegate was stripped
 815          * by the kdc, make sure we strip it too.
 816          */
 817         if (ok_as_delegate == 0 || tgt->flags.b.ok_as_delegate == 0) {
 818             ok_as_delegate = 0;
 819             tgt->flags.b.ok_as_delegate = 0;
 820         }
 821
 822         ret = add_cred(context, tgt, ret_tgts);
 823         if(ret) {
 824             krb5_free_principal(context, tmp_creds.server);
 825             krb5_free_principal(context, tmp_creds.client);
 826             return ret;
 827         }
 828         tgt_inst = tgt->server->name.name_string.val[1];
 829         if(strcmp(tgt_inst, server_realm) == 0)
 830             break;
 831         krb5_free_principal(context, tmp_creds.server);
 832         ret = krb5_make_principal(context, &tmp_creds.server,
 833                                   tgt_inst, KRB5_TGS_NAME, server_realm, NULL);
 834         if(ret) {
 835             krb5_free_principal(context, tmp_creds.server);
 836             krb5_free_principal(context, tmp_creds.client);
 837             return ret;
 838         }
 839         ret = krb5_free_creds(context, tgt);
 840         if(ret) {
 841             krb5_free_principal(context, tmp_creds.server);
 842             krb5_free_principal(context, tmp_creds.client);
 843             return ret;
 844         }
 845     }
 846
 847     krb5_free_principal(context, tmp_creds.server);
 848     krb5_free_principal(context, tmp_creds.client);
 849     *out_creds = calloc(1, sizeof(**out_creds));
 850     if(*out_creds == NULL) {
 851         ret = ENOMEM;
 852         krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
 853     } else {
 854         ret = get_cred_kdc_address (context, ccache, flags, NULL,
 855                                     in_creds, tgt, impersonate_principal,
 856                                     second_ticket, *out_creds);
 857         if (ret) {
 858             free (*out_creds);
 859             *out_creds = NULL;
 860         }
 861     }
 862     krb5_free_creds(context, tgt);
 863     return ret;
 864 }
 865
 866 static krb5_error_code
 867 get_cred_kdc_referral(krb5_context context,
 868                       krb5_kdc_flags flags,
 869                       krb5_ccache ccache,
 870                       krb5_creds *in_creds,
 871                       krb5_principal impersonate_principal,
 872                       Ticket *second_ticket,
 873                       krb5_creds **out_creds,
 874                       krb5_creds ***ret_tgts)
 875 {
 876     krb5_const_realm client_realm;
 877     krb5_error_code ret;
 878     krb5_creds tgt, referral, ticket;
 879     int loop = 0;
 880     int ok_as_delegate = 1;
 881
 882     if (in_creds->server->name.name_string.len < 2 && !flags.b.canonicalize) {
 883         krb5_set_error_message(context, KRB5KDC_ERR_PATH_NOT_ACCEPTED,
 884                                N_("Name too short to do referals, skipping", ""));
 885         return KRB5KDC_ERR_PATH_NOT_ACCEPTED;
 886     }
 887
 888     memset(&tgt, 0, sizeof(tgt));
 889     memset(&ticket, 0, sizeof(ticket));
 890
 891     flags.b.canonicalize = 1;
 892
 893     *out_creds = NULL;
 894
 895     client_realm = krb5_principal_get_realm(context, in_creds->client);
 896
 897     /* find tgt for the clients base realm */
 898     {
 899         krb5_principal tgtname;
 900
 901         ret = krb5_make_principal(context, &tgtname,
 902                                   client_realm,
 903                                   KRB5_TGS_NAME,
 904                                   client_realm,
 905                                   NULL);
 906         if(ret)
 907             return ret;
 908
 909         ret = find_cred(context, ccache, tgtname, *ret_tgts, &tgt);
 910         krb5_free_principal(context, tgtname);
 911         if (ret)
 912             return ret;
 913     }
 914
 915     referral = *in_creds;
 916     ret = krb5_copy_principal(context, in_creds->server, &referral.server);
 917     if (ret) {
 918         krb5_free_cred_contents(context, &tgt);
 919         return ret;
 920     }
 921     ret = krb5_principal_set_realm(context, referral.server, client_realm);
 922     if (ret) {
 923         krb5_free_cred_contents(context, &tgt);
 924         krb5_free_principal(context, referral.server);
 925         return ret;
 926     }
 927
 928     while (loop++ < 17) {
 929         krb5_creds **tickets;
 930         krb5_creds mcreds;
 931         char *referral_realm;
 932
 933         /* Use cache if we are not doing impersonation or contrainte deleg */
 934         if (impersonate_principal == NULL || flags.b.constrained_delegation) {
 935             krb5_cc_clear_mcred(&mcreds);
 936             mcreds.server = referral.server;
 937             ret = krb5_cc_retrieve_cred(context, ccache, 0, &mcreds, &ticket);
 938         } else
 939             ret = EINVAL;
 940
 941         if (ret) {
 942             ret = get_cred_kdc_address(context, ccache, flags, NULL,
 943                                        &referral, &tgt, impersonate_principal,
 944                                        second_ticket, &ticket);
 945             if (ret)
 946                 goto out;
 947         }
 948
 949         /* Did we get the right ticket ? */
 950         if (krb5_principal_compare_any_realm(context,
 951                                              referral.server,
 952                                              ticket.server))
 953             break;
 954
 955         if (!krb5_principal_is_krbtgt(context, ticket.server)) {
 956             krb5_set_error_message(context, KRB5KRB_AP_ERR_NOT_US,
 957                                    N_("Got back an non krbtgt "
 958                                       "ticket referrals", ""));
 959             ret = KRB5KRB_AP_ERR_NOT_US;
 960             goto out;
 961         }
 962
 963         referral_realm = ticket.server->name.name_string.val[1];
 964
 965         /* check that there are no referrals loops */
 966         tickets = *ret_tgts;
 967
 968         krb5_cc_clear_mcred(&mcreds);
 969         mcreds.server = ticket.server;
 970
 971         while(tickets && *tickets){
 972             if(krb5_compare_creds(context,
 973                                   KRB5_TC_DONT_MATCH_REALM,
 974                                   &mcreds,
 975                                   *tickets))
 976             {
 977                 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
 978                                        N_("Referral from %s "
 979                                           "loops back to realm %s", ""),
 980                                        tgt.server->realm,
 981                                        referral_realm);
 982                 ret = KRB5_GET_IN_TKT_LOOP;
 983                 goto out;
 984             }
 985             tickets++;
 986         }
 987
 988         /*
 989          * if either of the chain or the ok_as_delegate was stripped
 990          * by the kdc, make sure we strip it too.
 991          */
 992
 993         if (ok_as_delegate == 0 || ticket.flags.b.ok_as_delegate == 0) {
 994             ok_as_delegate = 0;
 995             ticket.flags.b.ok_as_delegate = 0;
 996         }
 997
 998         ret = add_cred(context, &ticket, ret_tgts);
 999         if (ret)
1000             goto out;
1001
1002         /* try realm in the referral */
1003         ret = krb5_principal_set_realm(context,
1004                                        referral.server,
1005                                        referral_realm);
1006         krb5_free_cred_contents(context, &tgt);
1007         tgt = ticket;
1008         memset(&ticket, 0, sizeof(ticket));
1009         if (ret)
1010             goto out;
1011     }
1012
1013     ret = krb5_copy_creds(context, &ticket, out_creds);
1014
1015 out:
1016     krb5_free_principal(context, referral.server);
1017     krb5_free_cred_contents(context, &tgt);
1018     krb5_free_cred_contents(context, &ticket);
1019     return ret;
1020 }
1021
1022
1023 /*
1024  * Glue function between referrals version and old client chasing
1025  * codebase.
1026  */
1027
1028 krb5_error_code
1029 _krb5_get_cred_kdc_any(krb5_context context,
1030                        krb5_kdc_flags flags,
1031                        krb5_ccache ccache,
1032                        krb5_creds *in_creds,
1033                        krb5_principal impersonate_principal,
1034                        Ticket *second_ticket,
1035                        krb5_creds **out_creds,
1036                        krb5_creds ***ret_tgts)
1037 {
1038     krb5_error_code ret;
1039     krb5_deltat offset;
1040
1041     ret = krb5_cc_get_kdc_offset(context, ccache, &offset);
1042     if (ret) {
1043         context->kdc_sec_offset = offset;
1044         context->kdc_usec_offset = 0;
1045     }
1046
1047     ret = get_cred_kdc_referral(context,
1048                                 flags,
1049                                 ccache,
1050                                 in_creds,
1051                                 impersonate_principal,
1052                                 second_ticket,
1053                                 out_creds,
1054                                 ret_tgts);
1055     if (ret == 0 || flags.b.canonicalize)
1056         return ret;
1057     return get_cred_kdc_capath(context,
1058                                 flags,
1059                                 ccache,
1060                                 in_creds,
1061                                 impersonate_principal,
1062                                 second_ticket,
1063                                 out_creds,
1064                                 ret_tgts);
1065 }
1066
1067
1068 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1069 krb5_get_credentials_with_flags(krb5_context context,
1070                                 krb5_flags options,
1071                                 krb5_kdc_flags flags,
1072                                 krb5_ccache ccache,
1073                                 krb5_creds *in_creds,
1074                                 krb5_creds **out_creds)
1075 {
1076     krb5_error_code ret;
1077     krb5_creds **tgts;
1078     krb5_creds *res_creds;
1079     int i;
1080
1081     if (in_creds->session.keytype) {
1082         ret = krb5_enctype_valid(context, in_creds->session.keytype);
1083         if (ret)
1084             return ret;
1085     }
1086
1087     *out_creds = NULL;
1088     res_creds = calloc(1, sizeof(*res_creds));
1089     if (res_creds == NULL) {
1090         krb5_set_error_message(context, ENOMEM,
1091                                N_("malloc: out of memory", ""));
1092         return ENOMEM;
1093     }
1094
1095     if (in_creds->session.keytype)
1096         options |= KRB5_TC_MATCH_KEYTYPE;
1097
1098     /*
1099      * If we got a credential, check if credential is expired before
1100      * returning it.
1101      */
1102     ret = krb5_cc_retrieve_cred(context,
1103                                 ccache,
1104                                 in_creds->session.keytype ?
1105                                 KRB5_TC_MATCH_KEYTYPE : 0,
1106                                 in_creds, res_creds);
1107     /*
1108      * If we got a credential, check if credential is expired before
1109      * returning it, but only if KRB5_GC_EXPIRED_OK is not set.
1110      */
1111     if (ret == 0) {
1112         krb5_timestamp timeret;
1113
1114         /* If expired ok, don't bother checking */
1115         if(options & KRB5_GC_EXPIRED_OK) {
1116             *out_creds = res_creds;
1117             return 0;
1118         }
1119
1120         krb5_timeofday(context, &timeret);
1121         if(res_creds->times.endtime > timeret) {
1122             *out_creds = res_creds;
1123             return 0;
1124         }
1125         if(options & KRB5_GC_CACHED)
1126             krb5_cc_remove_cred(context, ccache, 0, res_creds);
1127
1128     } else if(ret != KRB5_CC_END) {
1129         free(res_creds);
1130         return ret;
1131     }
1132     free(res_creds);
1133     if(options & KRB5_GC_CACHED)
1134         return not_found(context, in_creds->server, KRB5_CC_NOTFOUND);
1135
1136     if(options & KRB5_GC_USER_USER)
1137         flags.b.enc_tkt_in_skey = 1;
1138     if (flags.b.enc_tkt_in_skey)
1139         options |= KRB5_GC_NO_STORE;
1140
1141     tgts = NULL;
1142     ret = _krb5_get_cred_kdc_any(context, flags, ccache,
1143                                  in_creds, NULL, NULL, out_creds, &tgts);
1144     for(i = 0; tgts && tgts[i]; i++) {
1145         krb5_cc_store_cred(context, ccache, tgts[i]);
1146         krb5_free_creds(context, tgts[i]);
1147     }
1148     free(tgts);
1149     if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1150         krb5_cc_store_cred(context, ccache, *out_creds);
1151     return ret;
1152 }
1153
1154 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1155 krb5_get_credentials(krb5_context context,
1156                      krb5_flags options,
1157                      krb5_ccache ccache,
1158                      krb5_creds *in_creds,
1159                      krb5_creds **out_creds)
1160 {
1161     krb5_kdc_flags flags;
1162     flags.i = 0;
1163     return krb5_get_credentials_with_flags(context, options, flags,
1164                                            ccache, in_creds, out_creds);
1165 }
1166
1167 struct krb5_get_creds_opt_data {
1168     krb5_principal self;
1169     krb5_flags options;
1170     krb5_enctype enctype;
1171     Ticket *ticket;
1172 };
1173
1174
1175 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1176 krb5_get_creds_opt_alloc(krb5_context context, krb5_get_creds_opt *opt)
1177 {
1178     *opt = calloc(1, sizeof(**opt));
1179     if (*opt == NULL) {
1180         krb5_set_error_message(context, ENOMEM,
1181                                N_("malloc: out of memory", ""));
1182         return ENOMEM;
1183     }
1184     return 0;
1185 }
1186
1187 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1188 krb5_get_creds_opt_free(krb5_context context, krb5_get_creds_opt opt)
1189 {
1190     if (opt->self)
1191         krb5_free_principal(context, opt->self);
1192     if (opt->ticket) {
1193         free_Ticket(opt->ticket);
1194         free(opt->ticket);
1195     }
1196     memset(opt, 0, sizeof(*opt));
1197     free(opt);
1198 }
1199
1200 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1201 krb5_get_creds_opt_set_options(krb5_context context,
1202                                krb5_get_creds_opt opt,
1203                                krb5_flags options)
1204 {
1205     opt->options = options;
1206 }
1207
1208 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1209 krb5_get_creds_opt_add_options(krb5_context context,
1210                                krb5_get_creds_opt opt,
1211                                krb5_flags options)
1212 {
1213     opt->options |= options;
1214 }
1215
1216 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1217 krb5_get_creds_opt_set_enctype(krb5_context context,
1218                                krb5_get_creds_opt opt,
1219                                krb5_enctype enctype)
1220 {
1221     opt->enctype = enctype;
1222 }
1223
1224 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1225 krb5_get_creds_opt_set_impersonate(krb5_context context,
1226                                    krb5_get_creds_opt opt,
1227                                    krb5_const_principal self)
1228 {
1229     if (opt->self)
1230         krb5_free_principal(context, opt->self);
1231     return krb5_copy_principal(context, self, &opt->self);
1232 }
1233
1234 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1235 krb5_get_creds_opt_set_ticket(krb5_context context,
1236                               krb5_get_creds_opt opt,
1237                               const Ticket *ticket)
1238 {
1239     if (opt->ticket) {
1240         free_Ticket(opt->ticket);
1241         free(opt->ticket);
1242         opt->ticket = NULL;
1243     }
1244     if (ticket) {
1245         krb5_error_code ret;
1246
1247         opt->ticket = malloc(sizeof(*ticket));
1248         if (opt->ticket == NULL) {
1249             krb5_set_error_message(context, ENOMEM,
1250                                    N_("malloc: out of memory", ""));
1251             return ENOMEM;
1252         }
1253         ret = copy_Ticket(ticket, opt->ticket);
1254         if (ret) {
1255             free(opt->ticket);
1256             opt->ticket = NULL;
1257             krb5_set_error_message(context, ret,
1258                                    N_("malloc: out of memory", ""));
1259             return ret;
1260         }
1261     }
1262     return 0;
1263 }
1264
1265
1266
1267 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1268 krb5_get_creds(krb5_context context,
1269                krb5_get_creds_opt opt,
1270                krb5_ccache ccache,
1271                krb5_const_principal inprinc,
1272                krb5_creds **out_creds)
1273 {
1274     krb5_kdc_flags flags;
1275     krb5_flags options;
1276     krb5_creds in_creds;
1277     krb5_error_code ret;
1278     krb5_creds **tgts;
1279     krb5_creds *res_creds;
1280     int i;
1281
1282     if (opt && opt->enctype) {
1283         ret = krb5_enctype_valid(context, opt->enctype);
1284         if (ret)
1285             return ret;
1286     }
1287
1288     memset(&in_creds, 0, sizeof(in_creds));
1289     in_creds.server = rk_UNCONST(inprinc);
1290
1291     ret = krb5_cc_get_principal(context, ccache, &in_creds.client);
1292     if (ret)
1293         return ret;
1294
1295     if (opt)
1296         options = opt->options;
1297     else
1298         options = 0;
1299     flags.i = 0;
1300
1301     *out_creds = NULL;
1302     res_creds = calloc(1, sizeof(*res_creds));
1303     if (res_creds == NULL) {
1304         krb5_free_principal(context, in_creds.client);
1305         krb5_set_error_message(context, ENOMEM,
1306                                N_("malloc: out of memory", ""));
1307         return ENOMEM;
1308     }
1309
1310     if (opt && opt->enctype) {
1311         in_creds.session.keytype = opt->enctype;
1312         options |= KRB5_TC_MATCH_KEYTYPE;
1313     }
1314
1315     /*
1316      * If we got a credential, check if credential is expired before
1317      * returning it.
1318      */
1319     ret = krb5_cc_retrieve_cred(context,
1320                                 ccache,
1321                                 options & KRB5_TC_MATCH_KEYTYPE,
1322                                 &in_creds, res_creds);
1323     /*
1324      * If we got a credential, check if credential is expired before
1325      * returning it, but only if KRB5_GC_EXPIRED_OK is not set.
1326      */
1327     if (ret == 0) {
1328         krb5_timestamp timeret;
1329
1330         /* If expired ok, don't bother checking */
1331         if(options & KRB5_GC_EXPIRED_OK) {
1332             *out_creds = res_creds;
1333             krb5_free_principal(context, in_creds.client);
1334             goto out;
1335         }
1336
1337         krb5_timeofday(context, &timeret);
1338         if(res_creds->times.endtime > timeret) {
1339             *out_creds = res_creds;
1340             krb5_free_principal(context, in_creds.client);
1341             goto out;
1342         }
1343         if(options & KRB5_GC_CACHED)
1344             krb5_cc_remove_cred(context, ccache, 0, res_creds);
1345
1346     } else if(ret != KRB5_CC_END) {
1347         free(res_creds);
1348         krb5_free_principal(context, in_creds.client);
1349         goto out;
1350     }
1351     free(res_creds);
1352     if(options & KRB5_GC_CACHED) {
1353         krb5_free_principal(context, in_creds.client);
1354         ret = not_found(context, in_creds.server, KRB5_CC_NOTFOUND);
1355         goto out;
1356     }
1357     if(options & KRB5_GC_USER_USER) {
1358         flags.b.enc_tkt_in_skey = 1;
1359         options |= KRB5_GC_NO_STORE;
1360     }
1361     if (options & KRB5_GC_FORWARDABLE)
1362         flags.b.forwardable = 1;
1363     if (options & KRB5_GC_NO_TRANSIT_CHECK)
1364         flags.b.disable_transited_check = 1;
1365     if (options & KRB5_GC_CONSTRAINED_DELEGATION) {
1366         flags.b.request_anonymous = 1; /* XXX ARGH confusion */
1367         flags.b.constrained_delegation = 1;
1368     }
1369     if (options & KRB5_GC_CANONICALIZE)
1370         flags.b.canonicalize = 1;
1371
1372     tgts = NULL;
1373     ret = _krb5_get_cred_kdc_any(context, flags, ccache,
1374                                  &in_creds, opt->self, opt->ticket,
1375                                  out_creds, &tgts);
1376     krb5_free_principal(context, in_creds.client);
1377     for(i = 0; tgts && tgts[i]; i++) {
1378         krb5_cc_store_cred(context, ccache, tgts[i]);
1379         krb5_free_creds(context, tgts[i]);
1380     }
1381     free(tgts);
1382     if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1383         krb5_cc_store_cred(context, ccache, *out_creds);
1384
1385  out:
1386     _krb5_debug(context, 5, "krb5_get_creds: ret = %d", ret);
1387
1388     return ret;
1389 }
1390
1391 /*
1392  *
1393  */
1394
1395 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1396 krb5_get_renewed_creds(krb5_context context,
1397                        krb5_creds *creds,
1398                        krb5_const_principal client,
1399                        krb5_ccache ccache,
1400                        const char *in_tkt_service)
1401 {
1402     krb5_error_code ret;
1403     krb5_kdc_flags flags;
1404     krb5_creds in, *template, *out = NULL;
1405
1406     memset(&in, 0, sizeof(in));
1407     memset(creds, 0, sizeof(*creds));
1408
1409     ret = krb5_copy_principal(context, client, &in.client);
1410     if (ret)
1411         return ret;
1412
1413     if (in_tkt_service) {
1414         ret = krb5_parse_name(context, in_tkt_service, &in.server);
1415         if (ret) {
1416             krb5_free_principal(context, in.client);
1417             return ret;
1418         }
1419     } else {
1420         const char *realm = krb5_principal_get_realm(context, client);
1421
1422         ret = krb5_make_principal(context, &in.server, realm, KRB5_TGS_NAME,
1423                                   realm, NULL);
1424         if (ret) {
1425             krb5_free_principal(context, in.client);
1426             return ret;
1427         }
1428     }
1429
1430     flags.i = 0;
1431     flags.b.renewable = flags.b.renew = 1;
1432
1433     /*
1434      * Get template from old credential cache for the same entry, if
1435      * this failes, no worries.
1436      */
1437     ret = krb5_get_credentials(context, KRB5_GC_CACHED, ccache, &in, &template);
1438     if (ret == 0) {
1439         flags.b.forwardable = template->flags.b.forwardable;
1440         flags.b.proxiable = template->flags.b.proxiable;
1441         krb5_free_creds (context, template);
1442     }
1443
1444     ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &in, &out);
1445     krb5_free_principal(context, in.client);
1446     krb5_free_principal(context, in.server);
1447     if (ret)
1448         return ret;
1449
1450     ret = krb5_copy_creds_contents(context, out, creds);
1451     krb5_free_creds(context, out);
1452
1453     return ret;
1454 }