lib/krb5/init_creds_pw.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 - 2010 Apple Inc. All rights reserved.
   7  * Portions Copyright (c) 2021, PADL Software Pty Ltd. All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * 3. Neither the name of the Institute nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include "krb5_locl.h"
  38 #include "../base/heimbasepriv.h" /* XXX */
  39
  40 struct pa_info_data {
  41     krb5_enctype etype;
  42     krb5_salt salt;
  43     krb5_data *s2kparams;
  44 };
  45
  46 struct krb5_gss_init_ctx_data {
  47     krb5_gssic_step step;
  48     krb5_gssic_finish finish;
  49     krb5_gssic_release_cred release_cred;
  50     krb5_gssic_delete_sec_context delete_sec_context;
  51
  52     const struct gss_OID_desc_struct *mech;
  53     struct gss_cred_id_t_desc_struct *cred;
  54
  55     struct {
  56         unsigned int release_cred : 1;
  57     } flags;
  58 };
  59
  60 struct krb5_get_init_creds_ctx {
  61     KDCOptions flags;
  62     krb5_creds cred;
  63     krb5_addresses *addrs;
  64     krb5_enctype *etypes;
  65     krb5_preauthtype *pre_auth_types;
  66     char *in_tkt_service;
  67     unsigned nonce;
  68     unsigned pk_nonce;
  69
  70     krb5_data req_buffer;
  71     AS_REQ as_req;
  72     int pa_counter;
  73
  74     /* password and keytab_data is freed on completion */
  75     char *password;
  76     krb5_keytab_key_proc_args *keytab_data;
  77
  78     krb5_pointer *keyseed;
  79     krb5_s2k_proc keyproc;
  80
  81     krb5_get_init_creds_tristate req_pac;
  82
  83     krb5_pk_init_ctx pk_init_ctx;
  84     krb5_gss_init_ctx gss_init_ctx;
  85     int ic_flags;
  86
  87     char *kdc_hostname;
  88     char *sitename;
  89
  90     struct {
  91         unsigned int change_password:1;
  92         unsigned int change_password_prompt:1;
  93         unsigned int allow_enc_pa_rep:1;
  94         unsigned int allow_save_as_reply_key:1;
  95     } runflags;
  96
  97     struct pa_info_data paid;
  98
  99     METHOD_DATA md;
 100     KRB_ERROR error;
 101     EncKDCRepPart enc_part;
 102
 103     krb5_prompter_fct prompter;
 104     void *prompter_data;
 105     int warned_user;
 106
 107     struct pa_info_data *ppaid;
 108
 109     struct krb5_fast_state fast_state;
 110     krb5_enctype as_enctype;
 111     krb5_keyblock *as_reply_key;
 112
 113     /* current and available pa mechansm in this exchange */
 114     struct pa_auth_mech *pa_mech;
 115     heim_array_t available_pa_mechs;
 116     const char *pa_used;
 117
 118     struct {
 119         struct timeval run_time;
 120     } stats;
 121 };
 122
 123 static void
 124 free_paid(krb5_context context, struct pa_info_data *ppaid)
 125 {
 126     krb5_free_salt(context, ppaid->salt);
 127     if (ppaid->s2kparams)
 128         krb5_free_data(context, ppaid->s2kparams);
 129     memset(ppaid, 0, sizeof(*ppaid));
 130 }
 131
 132 static krb5_error_code KRB5_CALLCONV
 133 default_s2k_func(krb5_context context, krb5_enctype type,
 134                  krb5_const_pointer keyseed,
 135                  krb5_salt salt, krb5_data *s2kparms,
 136                  krb5_keyblock **key)
 137 {
 138     krb5_error_code ret;
 139     krb5_data password;
 140     krb5_data opaque;
 141
 142     if (_krb5_have_debug(context, 5)) {
 143         char *str = NULL;
 144         ret = krb5_enctype_to_string(context, type, &str);
 145         if (ret)
 146             return ret;
 147
 148         _krb5_debug(context, 5, "krb5_get_init_creds: using default_s2k_func: %s (%d)", str, (int)type);
 149         free(str);
 150     }
 151
 152     password.data = rk_UNCONST(keyseed);
 153     password.length = keyseed ? strlen(keyseed) : 0;
 154     if (s2kparms)
 155         opaque = *s2kparms;
 156     else
 157         krb5_data_zero(&opaque);
 158
 159     *key = malloc(sizeof(**key));
 160     if (*key == NULL)
 161         return krb5_enomem(context);
 162     ret = krb5_string_to_key_data_salt_opaque(context, type, password,
 163                                               salt, opaque, *key);
 164     if (ret) {
 165         free(*key);
 166         *key = NULL;
 167     }
 168     return ret;
 169 }
 170
 171 static void
 172 free_gss_init_ctx(krb5_context context, krb5_gss_init_ctx gssic)
 173 {
 174     if (gssic == NULL)
 175         return;
 176
 177     if (gssic->flags.release_cred)
 178         gssic->release_cred(context, gssic, gssic->cred);
 179     free(gssic);
 180 }
 181
 182 static void
 183 free_init_creds_ctx(krb5_context context, krb5_init_creds_context ctx)
 184 {
 185     if (ctx->etypes)
 186         free(ctx->etypes);
 187     if (ctx->pre_auth_types)
 188         free (ctx->pre_auth_types);
 189     if (ctx->in_tkt_service)
 190         free(ctx->in_tkt_service);
 191     if (ctx->keytab_data)
 192         free(ctx->keytab_data);
 193     if (ctx->password) {
 194         size_t len;
 195         len = strlen(ctx->password);
 196         memset_s(ctx->password, len, 0, len);
 197         free(ctx->password);
 198     }
 199     free_gss_init_ctx(context, ctx->gss_init_ctx);
 200     /*
 201      * FAST state
 202      */
 203     _krb5_fast_free(context, &ctx->fast_state);
 204     if (ctx->as_reply_key)
 205         krb5_free_keyblock(context, ctx->as_reply_key);
 206
 207     krb5_data_free(&ctx->req_buffer);
 208     krb5_free_cred_contents(context, &ctx->cred);
 209     free_METHOD_DATA(&ctx->md);
 210     free_EncKDCRepPart(&ctx->enc_part);
 211     free_KRB_ERROR(&ctx->error);
 212     free_AS_REQ(&ctx->as_req);
 213
 214     heim_release(ctx->available_pa_mechs);
 215     heim_release(ctx->pa_mech);
 216     ctx->pa_mech = NULL;
 217     free(ctx->kdc_hostname);
 218     free(ctx->sitename);
 219     free_paid(context, &ctx->paid);
 220     memset_s(ctx, sizeof(*ctx), 0, sizeof(*ctx));
 221 }
 222
 223 static krb5_deltat
 224 get_config_time (krb5_context context,
 225                  const char *realm,
 226                  const char *name,
 227                  int def)
 228 {
 229     krb5_deltat ret;
 230
 231     ret = krb5_config_get_time (context, NULL,
 232                                 "realms",
 233                                 realm,
 234                                 name,
 235                                 NULL);
 236     if (ret >= 0)
 237         return ret;
 238     ret = krb5_config_get_time (context, NULL,
 239                                 "libdefaults",
 240                                 name,
 241                                 NULL);
 242     if (ret >= 0)
 243         return ret;
 244     return def;
 245 }
 246
 247 static krb5_error_code
 248 init_cred (krb5_context context,
 249            krb5_creds *cred,
 250            krb5_principal client,
 251            krb5_deltat start_time,
 252            krb5_get_init_creds_opt *options)
 253 {
 254     krb5_error_code ret;
 255     krb5_deltat tmp;
 256     krb5_timestamp now;
 257
 258     krb5_timeofday (context, &now);
 259
 260     memset (cred, 0, sizeof(*cred));
 261
 262     if (client)
 263         ret = krb5_copy_principal(context, client, &cred->client);
 264     else
 265         ret = krb5_get_default_principal(context, &cred->client);
 266     if (ret)
 267         goto out;
 268
 269     if (start_time)
 270         cred->times.starttime  = now + start_time;
 271
 272     if (options->flags & KRB5_GET_INIT_CREDS_OPT_TKT_LIFE)
 273         tmp = options->tkt_life;
 274     else
 275         tmp = KRB5_TKT_LIFETIME_DEFAULT;
 276     cred->times.endtime = now + tmp;
 277
 278     if ((options->flags & KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE)) {
 279         if (options->renew_life > 0)
 280             tmp = options->renew_life;
 281         else
 282             tmp = KRB5_TKT_RENEW_LIFETIME_DEFAULT;
 283         cred->times.renew_till = now + tmp;
 284     }
 285
 286     return 0;
 287
 288 out:
 289     krb5_free_cred_contents (context, cred);
 290     return ret;
 291 }
 292
 293 /*
 294  * Print a message (str) to the user about the expiration in `lr'
 295  */
 296
 297 static void
 298 report_expiration (krb5_context context,
 299                    krb5_prompter_fct prompter,
 300                    krb5_data *data,
 301                    const char *str,
 302                    time_t now)
 303 {
 304     char *p = NULL;
 305
 306     if (asprintf(&p, "%s%s", str, ctime(&now)) < 0 || p == NULL)
 307         return;
 308     (*prompter)(context, data, NULL, p, 0, NULL);
 309     free(p);
 310 }
 311
 312 /*
 313  * Check the context, and in the case there is a expiration warning,
 314  * use the prompter to print the warning.
 315  *
 316  * @param context A Kerberos 5 context.
 317  * @param options An GIC options structure
 318  * @param ctx The krb5_init_creds_context check for expiration.
 319  */
 320
 321 krb5_error_code
 322 krb5_process_last_request(krb5_context context,
 323                           krb5_get_init_creds_opt *options,
 324                           krb5_init_creds_context ctx)
 325 {
 326     LastReq *lr;
 327     size_t i;
 328
 329     /*
 330      * First check if there is a API consumer.
 331      */
 332
 333     lr = &ctx->enc_part.last_req;
 334
 335     if (options && options->opt_private && options->opt_private->lr.func) {
 336         krb5_last_req_entry **lre;
 337
 338         lre = calloc(lr->len + 1, sizeof(*lre));
 339         if (lre == NULL)
 340             return krb5_enomem(context);
 341
 342         for (i = 0; i < lr->len; i++) {
 343             lre[i] = calloc(1, sizeof(*lre[i]));
 344             if (lre[i] == NULL)
 345                 break;
 346             lre[i]->lr_type = lr->val[i].lr_type;
 347             lre[i]->value = lr->val[i].lr_value;
 348         }
 349
 350         (*options->opt_private->lr.func)(context, lre,
 351                                          options->opt_private->lr.ctx);
 352
 353         for (i = 0; i < lr->len; i++)
 354             free(lre[i]);
 355         free(lre);
 356     }
 357
 358     return krb5_init_creds_warn_user(context, ctx);
 359 }
 360
 361 /**
 362  * Warn the user using prompter in the krb5_init_creds_context about
 363  * possible password and account expiration.
 364  *
 365  * @param context a Kerberos 5 context.
 366  * @param ctx a krb5_init_creds_context context.
 367  *
 368  * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
 369  * @ingroup krb5_credential
 370  */
 371
 372 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 373 krb5_init_creds_warn_user(krb5_context context,
 374                           krb5_init_creds_context ctx)
 375 {
 376     krb5_timestamp sec;
 377     krb5_const_realm realm;
 378     krb5_enctype weak_enctype = KRB5_ENCTYPE_NULL;
 379     LastReq *lr;
 380     unsigned i;
 381     time_t t;
 382
 383     if (ctx->prompter == NULL)
 384         return 0;
 385
 386     if (ctx->warned_user)
 387         return 0;
 388
 389     ctx->warned_user = 1;
 390
 391     krb5_timeofday (context, &sec);
 392
 393     realm = krb5_principal_get_realm (context, ctx->cred.client);
 394     lr = &ctx->enc_part.last_req;
 395
 396     t = sec + get_config_time (context,
 397                                realm,
 398                                "warn_pwexpire",
 399                                7 * 24 * 60 * 60);
 400
 401     for (i = 0; i < lr->len; ++i) {
 402         if (lr->val[i].lr_value <= t) {
 403             switch (lr->val[i].lr_type) {
 404             case LR_PW_EXPTIME :
 405                 report_expiration(context, ctx->prompter,
 406                                   ctx->prompter_data,
 407                                   "Your password will expire at ",
 408                                   lr->val[i].lr_value);
 409                 break;
 410             case LR_ACCT_EXPTIME :
 411                 report_expiration(context, ctx->prompter,
 412                                   ctx->prompter_data,
 413                                   "Your account will expire at ",
 414                                   lr->val[i].lr_value);
 415                 break;
 416             default:
 417                 break;
 418             }
 419         }
 420     }
 421
 422     if (krb5_is_enctype_weak(context, ctx->as_enctype))
 423         weak_enctype = ctx->as_enctype;
 424     else if (krb5_is_enctype_weak(context, ctx->cred.session.keytype))
 425         weak_enctype = ctx->cred.session.keytype;
 426
 427     if (ctx->prompter && weak_enctype != KRB5_ENCTYPE_NULL) {
 428         int suppress = krb5_config_get_bool_default(context, NULL, false,
 429                                                     "libdefaults",
 430                                                     "suppress_weak_enctype", NULL);
 431         if (!suppress) {
 432             char *str = NULL, *p = NULL;
 433             int aret;
 434             krb5_enctype_to_string(context, weak_enctype, &str);
 435
 436             aret = asprintf(&p, "Encryption type %s(%d) used for authentication is weak and will be deprecated",
 437                             str ? str : "unknown", weak_enctype);
 438             if (aret >= 0 && p) {
 439                 (*ctx->prompter)(context, ctx->prompter_data, NULL, p, 0, NULL);
 440                 free(p);
 441             }
 442             free(str);
 443         }
 444     }
 445
 446     return 0;
 447 }
 448
 449 static krb5_addresses no_addrs = { 0, NULL };
 450
 451 static krb5_error_code
 452 get_init_creds_common(krb5_context context,
 453                       krb5_principal client,
 454                       krb5_prompter_fct prompter,
 455                       void *prompter_data,
 456                       krb5_deltat start_time,
 457                       krb5_get_init_creds_opt *options,
 458                       krb5_init_creds_context ctx)
 459 {
 460     krb5_get_init_creds_opt *default_opt = NULL;
 461     krb5_error_code ret;
 462     krb5_enctype *etypes;
 463     krb5_preauthtype *pre_auth_types;
 464
 465     memset(ctx, 0, sizeof(*ctx));
 466
 467     if (options == NULL) {
 468         const char *realm = krb5_principal_get_realm(context, client);
 469
 470         krb5_get_init_creds_opt_alloc (context, &default_opt);
 471         options = default_opt;
 472         krb5_get_init_creds_opt_set_default_flags(context, NULL, realm, options);
 473     }
 474
 475     if (options->opt_private) {
 476         if (options->opt_private->password) {
 477             ret = krb5_init_creds_set_password(context, ctx,
 478                                                options->opt_private->password);
 479             if (ret)
 480                 goto out;
 481         }
 482
 483         ctx->keyproc = options->opt_private->key_proc;
 484         ctx->req_pac = options->opt_private->req_pac;
 485         ctx->pk_init_ctx = options->opt_private->pk_init_ctx;
 486         ctx->ic_flags = options->opt_private->flags;
 487     } else
 488         ctx->req_pac = KRB5_INIT_CREDS_TRISTATE_UNSET;
 489
 490     if (ctx->keyproc == NULL)
 491         ctx->keyproc = default_s2k_func;
 492
 493     if (ctx->ic_flags & KRB5_INIT_CREDS_CANONICALIZE)
 494         ctx->flags.canonicalize = 1;
 495
 496     ctx->pre_auth_types = NULL;
 497     ctx->addrs = NULL;
 498     ctx->etypes = NULL;
 499     ctx->pre_auth_types = NULL;
 500
 501     ret = init_cred(context, &ctx->cred, client, start_time, options);
 502     if (ret) {
 503         if (default_opt)
 504             krb5_get_init_creds_opt_free(context, default_opt);
 505         return ret;
 506     }
 507
 508     ret = krb5_init_creds_set_service(context, ctx, NULL);
 509     if (ret)
 510         goto out;
 511
 512     if (options->flags & KRB5_GET_INIT_CREDS_OPT_FORWARDABLE)
 513         ctx->flags.forwardable = options->forwardable;
 514
 515     if (options->flags & KRB5_GET_INIT_CREDS_OPT_PROXIABLE)
 516         ctx->flags.proxiable = options->proxiable;
 517
 518     if (start_time)
 519         ctx->flags.postdated = 1;
 520     if (ctx->cred.times.renew_till)
 521         ctx->flags.renewable = 1;
 522     if (options->flags & KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST) {
 523         ctx->addrs = options->address_list;
 524     } else if (options->opt_private) {
 525         switch (options->opt_private->addressless) {
 526         case KRB5_INIT_CREDS_TRISTATE_UNSET:
 527 #if KRB5_ADDRESSLESS_DEFAULT == TRUE
 528             ctx->addrs = &no_addrs;
 529 #else
 530             ctx->addrs = NULL;
 531 #endif
 532             break;
 533         case KRB5_INIT_CREDS_TRISTATE_FALSE:
 534             ctx->addrs = NULL;
 535             break;
 536         case KRB5_INIT_CREDS_TRISTATE_TRUE:
 537             ctx->addrs = &no_addrs;
 538             break;
 539         }
 540     }
 541     if (options->flags & KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST) {
 542         if (ctx->etypes)
 543             free(ctx->etypes);
 544
 545         etypes = malloc((options->etype_list_length + 1)
 546                         * sizeof(krb5_enctype));
 547         if (etypes == NULL) {
 548             ret = krb5_enomem(context);
 549             goto out;
 550         }
 551         memcpy (etypes, options->etype_list,
 552                 options->etype_list_length * sizeof(krb5_enctype));
 553         etypes[options->etype_list_length] = ETYPE_NULL;
 554         ctx->etypes = etypes;
 555     }
 556     if (options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST) {
 557         pre_auth_types = malloc((options->preauth_list_length + 1)
 558                                 * sizeof(krb5_preauthtype));
 559         if (pre_auth_types == NULL) {
 560             ret = krb5_enomem(context);
 561             goto out;
 562         }
 563         memcpy (pre_auth_types, options->preauth_list,
 564                 options->preauth_list_length * sizeof(krb5_preauthtype));
 565         pre_auth_types[options->preauth_list_length] = KRB5_PADATA_NONE;
 566         ctx->pre_auth_types = pre_auth_types;
 567     }
 568     if (options->flags & KRB5_GET_INIT_CREDS_OPT_ANONYMOUS)
 569         ctx->flags.request_anonymous = options->anonymous;
 570
 571     ctx->prompter = prompter;
 572     ctx->prompter_data = prompter_data;
 573
 574     if ((options->flags & KRB5_GET_INIT_CREDS_OPT_CHANGE_PASSWORD_PROMPT) &&
 575         !options->change_password_prompt)
 576         ctx->runflags.change_password_prompt = 0;
 577     else
 578         ctx->runflags.change_password_prompt = ctx->prompter != NULL;
 579
 580     if (default_opt)
 581         krb5_get_init_creds_opt_free(context, default_opt);
 582     return 0;
 583
 584  out:
 585     if (default_opt)
 586         krb5_get_init_creds_opt_free(context, default_opt);
 587     return ret;
 588 }
 589
 590 static krb5_error_code
 591 change_password (krb5_context context,
 592                  krb5_principal client,
 593                  const char *password,
 594                  char *newpw,
 595                  size_t newpw_sz,
 596                  krb5_prompter_fct prompter,
 597                  void *data,
 598                  krb5_get_init_creds_opt *old_options)
 599 {
 600     krb5_prompt prompts[2];
 601     krb5_error_code ret;
 602     krb5_creds cpw_cred;
 603     char buf1[BUFSIZ], buf2[BUFSIZ];
 604     krb5_data password_data[2];
 605     int result_code;
 606     krb5_data result_code_string;
 607     krb5_data result_string;
 608     char *p;
 609     krb5_get_init_creds_opt *options;
 610
 611     heim_assert(prompter != NULL, "unexpected NULL prompter");
 612
 613     memset (&cpw_cred, 0, sizeof(cpw_cred));
 614
 615     ret = krb5_get_init_creds_opt_alloc(context, &options);
 616     if (ret)
 617         return ret;
 618     krb5_get_init_creds_opt_set_tkt_life (options, 60);
 619     krb5_get_init_creds_opt_set_forwardable (options, FALSE);
 620     krb5_get_init_creds_opt_set_proxiable (options, FALSE);
 621     if (old_options &&
 622         (old_options->flags & KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST))
 623         krb5_get_init_creds_opt_set_preauth_list(options,
 624                                                  old_options->preauth_list,
 625                                                  old_options->preauth_list_length);
 626     if (old_options &&
 627         (old_options->flags & KRB5_GET_INIT_CREDS_OPT_CHANGE_PASSWORD_PROMPT))
 628         krb5_get_init_creds_opt_set_change_password_prompt(options,
 629                                                            old_options->change_password_prompt);
 630
 631     krb5_data_zero (&result_code_string);
 632     krb5_data_zero (&result_string);
 633
 634     ret = krb5_get_init_creds_password (context,
 635                                         &cpw_cred,
 636                                         client,
 637                                         password,
 638                                         prompter,
 639                                         data,
 640                                         0,
 641                                         "kadmin/changepw",
 642                                         options);
 643     krb5_get_init_creds_opt_free(context, options);
 644     if (ret)
 645         goto out;
 646
 647     for(;;) {
 648         password_data[0].data   = buf1;
 649         password_data[0].length = sizeof(buf1);
 650
 651         prompts[0].hidden = 1;
 652         prompts[0].prompt = "New password: ";
 653         prompts[0].reply  = &password_data[0];
 654         prompts[0].type   = KRB5_PROMPT_TYPE_NEW_PASSWORD;
 655
 656         password_data[1].data   = buf2;
 657         password_data[1].length = sizeof(buf2);
 658
 659         prompts[1].hidden = 1;
 660         prompts[1].prompt = "Repeat new password: ";
 661         prompts[1].reply  = &password_data[1];
 662         prompts[1].type   = KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN;
 663
 664         ret = (*prompter) (context, data, NULL, "Changing password",
 665                            2, prompts);
 666         if (ret) {
 667             memset (buf1, 0, sizeof(buf1));
 668             memset (buf2, 0, sizeof(buf2));
 669             goto out;
 670         }
 671
 672         if (strcmp (buf1, buf2) == 0)
 673             break;
 674         memset (buf1, 0, sizeof(buf1));
 675         memset (buf2, 0, sizeof(buf2));
 676     }
 677
 678     ret = krb5_set_password (context,
 679                              &cpw_cred,
 680                              buf1,
 681                              client,
 682                              &result_code,
 683                              &result_code_string,
 684                              &result_string);
 685     if (ret)
 686         goto out;
 687
 688     if (asprintf(&p, "%s: %.*s\n",
 689                  result_code ? "Error" : "Success",
 690                  (int)result_string.length,
 691                  result_string.length > 0 ? (char*)result_string.data : "") < 0)
 692     {
 693         ret = krb5_enomem(context);
 694         goto out;
 695     }
 696
 697     /* return the result */
 698     (*prompter) (context, data, NULL, p, 0, NULL);
 699
 700     if (result_code == 0) {
 701         strlcpy (newpw, buf1, newpw_sz);
 702         ret = 0;
 703     } else {
 704         krb5_set_error_message(context, ret = KRB5_CHPW_FAIL,
 705                                N_("failed changing password: %s", ""), p);
 706     }
 707     free (p);
 708
 709 out:
 710     memset_s(buf1, sizeof(buf1), 0, sizeof(buf1));
 711     memset_s(buf2, sizeof(buf2), 0, sizeof(buf2));
 712     krb5_data_free (&result_string);
 713     krb5_data_free (&result_code_string);
 714     krb5_free_cred_contents (context, &cpw_cred);
 715     return ret;
 716 }
 717
 718
 719 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 720 krb5_keyblock_key_proc (krb5_context context,
 721                         krb5_keytype type,
 722                         krb5_data *salt,
 723                         krb5_const_pointer keyseed,
 724                         krb5_keyblock **key)
 725 {
 726     return krb5_copy_keyblock (context, keyseed, key);
 727 }
 728
 729 /*
 730  *
 731  */
 732
 733 static krb5_error_code
 734 init_as_req (krb5_context context,
 735              KDCOptions opts,
 736              const krb5_creds *creds,
 737              const krb5_addresses *addrs,
 738              const krb5_enctype *etypes,
 739              AS_REQ *a)
 740 {
 741     krb5_error_code ret;
 742
 743     memset(a, 0, sizeof(*a));
 744
 745     a->pvno = 5;
 746     a->msg_type = krb_as_req;
 747     a->req_body.kdc_options = opts;
 748     a->req_body.cname = calloc(1, sizeof(*a->req_body.cname));
 749     if (a->req_body.cname == NULL) {
 750         ret = krb5_enomem(context);
 751         goto fail;
 752     }
 753     a->req_body.sname = calloc(1, sizeof(*a->req_body.sname));
 754     if (a->req_body.sname == NULL) {
 755         ret = krb5_enomem(context);
 756         goto fail;
 757     }
 758
 759     ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
 760     if (ret)
 761         goto fail;
 762     ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
 763     if (ret)
 764         goto fail;
 765
 766     ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
 767     if (ret)
 768         goto fail;
 769
 770     if(creds->times.starttime) {
 771         a->req_body.from = malloc(sizeof(*a->req_body.from));
 772         if (a->req_body.from == NULL) {
 773             ret = krb5_enomem(context);
 774             goto fail;
 775         }
 776         *a->req_body.from = creds->times.starttime;
 777     }
 778     if(creds->times.endtime){
 779         if ((ALLOC(a->req_body.till, 1)) != NULL)
 780             *a->req_body.till = creds->times.endtime;
 781         else {
 782             ret = krb5_enomem(context);
 783             goto fail;
 784         }
 785     }
 786     if(creds->times.renew_till){
 787         a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
 788         if (a->req_body.rtime == NULL) {
 789             ret = krb5_enomem(context);
 790             goto fail;
 791         }
 792         *a->req_body.rtime = creds->times.renew_till;
 793     }
 794     a->req_body.nonce = 0;
 795     ret = _krb5_init_etype(context,
 796                            KRB5_PDU_AS_REQUEST,
 797                            &a->req_body.etype.len,
 798                            &a->req_body.etype.val,
 799                            etypes);
 800     if (ret)
 801         goto fail;
 802
 803     /*
 804      * This means no addresses
 805      */
 806
 807     if (addrs && addrs->len == 0) {
 808         a->req_body.addresses = NULL;
 809     } else {
 810         a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
 811         if (a->req_body.addresses == NULL) {
 812             ret = krb5_enomem(context);
 813             goto fail;
 814         }
 815
 816         if (addrs)
 817             ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
 818         else {
 819             ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
 820             if(ret == 0 && a->req_body.addresses->len == 0) {
 821                 free(a->req_body.addresses);
 822                 a->req_body.addresses = NULL;
 823             }
 824         }
 825         if (ret)
 826             goto fail;
 827     }
 828
 829     a->req_body.enc_authorization_data = NULL;
 830     a->req_body.additional_tickets = NULL;
 831
 832     a->padata = NULL;
 833
 834     return 0;
 835  fail:
 836     free_AS_REQ(a);
 837     memset_s(a, sizeof(*a), 0, sizeof(*a));
 838     return ret;
 839 }
 840
 841
 842 static krb5_error_code
 843 set_paid(struct pa_info_data *paid, krb5_context context,
 844          krb5_enctype etype,
 845          krb5_salttype salttype, void *salt_string, size_t salt_len,
 846          krb5_data *s2kparams)
 847 {
 848     paid->etype = etype;
 849     paid->salt.salttype = salttype;
 850     paid->salt.saltvalue.data = malloc(salt_len + 1);
 851     if (paid->salt.saltvalue.data == NULL) {
 852         krb5_clear_error_message(context);
 853         return krb5_enomem(context);
 854     }
 855     memcpy(paid->salt.saltvalue.data, salt_string, salt_len);
 856     ((char *)paid->salt.saltvalue.data)[salt_len] = '\0';
 857     paid->salt.saltvalue.length = salt_len;
 858     if (s2kparams) {
 859         krb5_error_code ret;
 860
 861         ret = krb5_copy_data(context, s2kparams, &paid->s2kparams);
 862         if (ret) {
 863             krb5_clear_error_message(context);
 864             krb5_free_salt(context, paid->salt);
 865             return ret;
 866         }
 867     } else
 868         paid->s2kparams = NULL;
 869
 870     return 0;
 871 }
 872
 873 static struct pa_info_data *
 874 pa_etype_info2(krb5_context context,
 875                const krb5_principal client,
 876                const AS_REQ *asreq,
 877                struct pa_info_data *paid,
 878                heim_octet_string *data)
 879 {
 880     krb5_error_code ret;
 881     ETYPE_INFO2 e;
 882     size_t sz;
 883     size_t i, j;
 884
 885     memset(&e, 0, sizeof(e));
 886     ret = decode_ETYPE_INFO2(data->data, data->length, &e, &sz);
 887     if (ret)
 888         goto out;
 889     if (e.len == 0)
 890         goto out;
 891     for (j = 0; j < asreq->req_body.etype.len; j++) {
 892         for (i = 0; i < e.len; i++) {
 893
 894             if (krb5_enctype_valid(context, e.val[i].etype) != 0)
 895                 continue;
 896
 897             if (asreq->req_body.etype.val[j] == e.val[i].etype) {
 898                 krb5_salt salt;
 899                 if (e.val[i].salt == NULL)
 900                     ret = krb5_get_pw_salt(context, client, &salt);
 901                 else {
 902                     salt.saltvalue.data = *e.val[i].salt;
 903                     salt.saltvalue.length = strlen(*e.val[i].salt);
 904                     ret = 0;
 905                 }
 906                 if (ret == 0)
 907                     ret = set_paid(paid, context, e.val[i].etype,
 908                                    KRB5_PW_SALT,
 909                                    salt.saltvalue.data,
 910                                    salt.saltvalue.length,
 911                                    e.val[i].s2kparams);
 912                 if (e.val[i].salt == NULL)
 913                     krb5_free_salt(context, salt);
 914                 if (ret == 0) {
 915                     free_ETYPE_INFO2(&e);
 916                     return paid;
 917                 }
 918             }
 919         }
 920     }
 921  out:
 922     free_ETYPE_INFO2(&e);
 923     return NULL;
 924 }
 925
 926 static struct pa_info_data *
 927 pa_etype_info(krb5_context context,
 928               const krb5_principal client,
 929               const AS_REQ *asreq,
 930               struct pa_info_data *paid,
 931               heim_octet_string *data)
 932 {
 933     krb5_error_code ret;
 934     ETYPE_INFO e;
 935     size_t sz;
 936     size_t i, j;
 937
 938     memset(&e, 0, sizeof(e));
 939     ret = decode_ETYPE_INFO(data->data, data->length, &e, &sz);
 940     if (ret)
 941         goto out;
 942     if (e.len == 0)
 943         goto out;
 944     for (j = 0; j < asreq->req_body.etype.len; j++) {
 945         for (i = 0; i < e.len; i++) {
 946
 947             if (krb5_enctype_valid(context, e.val[i].etype) != 0)
 948                 continue;
 949
 950             if (asreq->req_body.etype.val[j] == e.val[i].etype) {
 951                 krb5_salt salt;
 952                 salt.salttype = KRB5_PW_SALT;
 953                 if (e.val[i].salt == NULL)
 954                     ret = krb5_get_pw_salt(context, client, &salt);
 955                 else {
 956                     salt.saltvalue = *e.val[i].salt;
 957                     ret = 0;
 958                 }
 959                 if (e.val[i].salttype)
 960                     salt.salttype = *e.val[i].salttype;
 961                 if (ret == 0) {
 962                     ret = set_paid(paid, context, e.val[i].etype,
 963                                    salt.salttype,
 964                                    salt.saltvalue.data,
 965                                    salt.saltvalue.length,
 966                                    NULL);
 967                     if (e.val[i].salt == NULL)
 968                         krb5_free_salt(context, salt);
 969                 }
 970                 if (ret == 0) {
 971                     free_ETYPE_INFO(&e);
 972                     return paid;
 973                 }
 974             }
 975         }
 976     }
 977  out:
 978     free_ETYPE_INFO(&e);
 979     return NULL;
 980 }
 981
 982 static struct pa_info_data *
 983 pa_pw_or_afs3_salt(krb5_context context,
 984                    const krb5_principal client,
 985                    const AS_REQ *asreq,
 986                    struct pa_info_data *paid,
 987                    heim_octet_string *data)
 988 {
 989     krb5_error_code ret;
 990     if (paid->etype == KRB5_ENCTYPE_NULL)
 991         return NULL;
 992     if (krb5_enctype_valid(context, paid->etype) != 0)
 993         return NULL;
 994
 995     ret = set_paid(paid, context,
 996                    paid->etype,
 997                    paid->salt.salttype,
 998                    data->data,
 999                    data->length,
1000                    NULL);
1001     if (ret)
1002         return NULL;
1003     return paid;
1004 }
1005
1006
1007 static krb5_error_code
1008 make_pa_enc_timestamp(krb5_context context, METHOD_DATA *md,
1009                       krb5_enctype etype, krb5_keyblock *key)
1010 {
1011     PA_ENC_TS_ENC p;
1012     unsigned char *buf;
1013     size_t buf_size;
1014     size_t len = 0;
1015     EncryptedData encdata;
1016     krb5_error_code ret;
1017     int32_t usec;
1018     int usec2;
1019     krb5_crypto crypto;
1020
1021     krb5_us_timeofday (context, &p.patimestamp, &usec);
1022     usec2         = usec;
1023     p.pausec      = &usec2;
1024
1025     ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
1026     if (ret)
1027         return ret;
1028     if(buf_size != len)
1029         krb5_abortx(context, "internal error in ASN.1 encoder");
1030
1031     ret = krb5_crypto_init(context, key, 0, &crypto);
1032     if (ret) {
1033         free(buf);
1034         return ret;
1035     }
1036     ret = krb5_encrypt_EncryptedData(context,
1037                                      crypto,
1038                                      KRB5_KU_PA_ENC_TIMESTAMP,
1039                                      buf,
1040                                      len,
1041                                      0,
1042                                      &encdata);
1043     free(buf);
1044     krb5_crypto_destroy(context, crypto);
1045     if (ret)
1046         return ret;
1047
1048     ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
1049     free_EncryptedData(&encdata);
1050     if (ret)
1051         return ret;
1052     if(buf_size != len)
1053         krb5_abortx(context, "internal error in ASN.1 encoder");
1054
1055     ret = krb5_padata_add(context, md, KRB5_PADATA_ENC_TIMESTAMP, buf, len);
1056     if (ret)
1057         free(buf);
1058     return ret;
1059 }
1060
1061 static krb5_error_code
1062 add_enc_ts_padata(krb5_context context,
1063                   METHOD_DATA *md,
1064                   krb5_principal client,
1065                   krb5_s2k_proc keyproc,
1066                   krb5_const_pointer keyseed,
1067                   krb5_enctype *enctypes,
1068                   unsigned netypes,
1069                   krb5_salt *salt,
1070                   krb5_data *s2kparams)
1071 {
1072     krb5_error_code ret;
1073     krb5_salt salt2;
1074     krb5_enctype *ep;
1075     size_t i;
1076
1077     memset(&salt2, 0, sizeof(salt2));
1078
1079     if(salt == NULL) {
1080         /* default to standard salt */
1081         ret = krb5_get_pw_salt (context, client, &salt2);
1082         if (ret)
1083             return ret;
1084         salt = &salt2;
1085     }
1086     if (!enctypes) {
1087         enctypes = context->etypes;
1088         netypes = 0;
1089         for (ep = enctypes; *ep != (krb5_enctype)ETYPE_NULL; ep++)
1090             netypes++;
1091     }
1092
1093     for (i = 0; i < netypes; ++i) {
1094         krb5_keyblock *key;
1095
1096         _krb5_debug(context, 5, "krb5_get_init_creds: using ENC-TS with enctype %d", enctypes[i]);
1097
1098         ret = (*keyproc)(context, enctypes[i], keyseed,
1099                          *salt, s2kparams, &key);
1100         if (ret)
1101             continue;
1102         ret = make_pa_enc_timestamp (context, md, enctypes[i], key);
1103         krb5_free_keyblock (context, key);
1104         if (ret)
1105             return ret;
1106     }
1107     if(salt == &salt2)
1108         krb5_free_salt(context, salt2);
1109     return 0;
1110 }
1111
1112 static krb5_error_code
1113 pa_data_to_md_ts_enc(krb5_context context,
1114                      const AS_REQ *a,
1115                      const krb5_principal client,
1116                      krb5_init_creds_context ctx,
1117                      struct pa_info_data *ppaid,
1118                      METHOD_DATA *md)
1119 {
1120     if (ctx->keyproc == NULL || ctx->keyseed == NULL)
1121         return 0;
1122
1123     if (ppaid) {
1124         add_enc_ts_padata(context, md, client,
1125                           ctx->keyproc, ctx->keyseed,
1126                           &ppaid->etype, 1,
1127                           &ppaid->salt, ppaid->s2kparams);
1128     } else {
1129         krb5_salt salt;
1130
1131         _krb5_debug(context, 5, "krb5_get_init_creds: pa-info not found, guessing salt");
1132
1133         /* make a v5 salted pa-data */
1134         add_enc_ts_padata(context, md, client,
1135                           ctx->keyproc, ctx->keyseed,
1136                           a->req_body.etype.val, a->req_body.etype.len,
1137                           NULL, NULL);
1138
1139         /* make a v4 salted pa-data */
1140         salt.salttype = KRB5_PW_SALT;
1141         krb5_data_zero(&salt.saltvalue);
1142         add_enc_ts_padata(context, md, client,
1143                           ctx->keyproc, ctx->keyseed,
1144                           a->req_body.etype.val, a->req_body.etype.len,
1145                           &salt, NULL);
1146     }
1147     return 0;
1148 }
1149
1150 static krb5_error_code
1151 pa_data_to_key_plain(krb5_context context,
1152                      const krb5_principal client,
1153                      krb5_init_creds_context ctx,
1154                      krb5_salt salt,
1155                      krb5_data *s2kparams,
1156                      krb5_enctype etype,
1157                      krb5_keyblock **key)
1158 {
1159     krb5_error_code ret;
1160
1161     ret = (*ctx->keyproc)(context, etype, ctx->keyseed,
1162                            salt, s2kparams, key);
1163     return ret;
1164 }
1165
1166 struct pkinit_context {
1167     unsigned int win2k : 1;
1168     unsigned int used_pkinit : 1;
1169 };
1170
1171
1172 static krb5_error_code
1173 pa_data_to_md_pkinit(krb5_context context,
1174                      const AS_REQ *a,
1175                      const krb5_principal client,
1176                      int win2k,
1177                      krb5_init_creds_context ctx,
1178                      METHOD_DATA *md)
1179 {
1180     if (ctx->pk_init_ctx == NULL)
1181         return 0;
1182 #ifdef PKINIT
1183     return _krb5_pk_mk_padata(context,
1184                               ctx->pk_init_ctx,
1185                               ctx->ic_flags,
1186                               win2k,
1187                               &a->req_body,
1188                               ctx->pk_nonce,
1189                               md);
1190 #else
1191     krb5_set_error_message(context, EINVAL,
1192                            N_("no support for PKINIT compiled in", ""));
1193     return EINVAL;
1194 #endif
1195 }
1196
1197 static krb5_error_code
1198 pkinit_configure_ietf(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx)
1199 {
1200     struct pkinit_context *pkinit_ctx = pa_ctx;
1201
1202     pkinit_ctx->win2k = 0;
1203
1204     if (ctx->pk_init_ctx == NULL)
1205         return HEIM_ERR_PA_CANT_CONTINUE;
1206
1207     return 0;
1208 }
1209
1210 static krb5_error_code
1211 pkinit_configure_win(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx)
1212 {
1213     struct pkinit_context *pkinit_ctx = pa_ctx;
1214
1215     pkinit_ctx->win2k = 1;
1216     pkinit_ctx->used_pkinit = 0;
1217
1218     if (ctx->pk_init_ctx == NULL)
1219         return HEIM_ERR_PA_CANT_CONTINUE;
1220
1221     return 0;
1222 }
1223
1224 static krb5_error_code
1225 pkinit_step(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx, PA_DATA *pa, const AS_REQ *a,
1226             const AS_REP *rep, const krb5_krbhst_info *hi, METHOD_DATA *in_md, METHOD_DATA *out_md)
1227 {
1228     krb5_error_code ret = HEIM_ERR_PA_CANT_CONTINUE;
1229     struct pkinit_context *pkinit_ctx = pa_ctx;
1230
1231     if (rep == NULL) {
1232         if (pkinit_ctx->used_pkinit) {
1233             krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1234                                    "Already tried PKINIT(%s), looping",
1235                                    pkinit_ctx->win2k ? "win2k" : "ietf");
1236         } else {
1237             ret = pa_data_to_md_pkinit(context, a, ctx->cred.client,
1238                                        (pkinit_ctx->win2k != 0),
1239                                        ctx, out_md);
1240             if (ret == 0)
1241                 ret = HEIM_ERR_PA_CONTINUE_NEEDED;
1242
1243             pkinit_ctx->used_pkinit = 1;
1244         }
1245     } else if (pa) {
1246         ret = _krb5_pk_rd_pa_reply(context,
1247                                    a->req_body.realm,
1248                                    ctx->pk_init_ctx,
1249                                    rep->enc_part.etype,
1250                                    hi,
1251                                    ctx->pk_nonce,
1252                                    &ctx->req_buffer,
1253                                    pa,
1254                                    &ctx->fast_state.reply_key);
1255         if (ret == 0)
1256             ctx->runflags.allow_save_as_reply_key = 1;
1257     }
1258
1259     return ret;
1260 }
1261
1262 static void
1263 pkinit_release(void *pa_ctx)
1264 {
1265 }
1266
1267 /*
1268  * GSS-API pre-authentication support
1269  */
1270
1271 struct pa_gss_context {
1272     struct gss_ctx_id_t_desc_struct *context_handle;
1273     int open;
1274 };
1275
1276 static krb5_error_code
1277 pa_gss_configure(krb5_context context,
1278                  krb5_init_creds_context ctx,
1279                  void *pa_ctx)
1280 {
1281     krb5_gss_init_ctx gssic = ctx->gss_init_ctx;
1282     struct pa_gss_context *pa_gss_ctx = pa_ctx;
1283
1284     if (gssic == NULL)
1285         return HEIM_ERR_PA_CANT_CONTINUE;
1286
1287     pa_gss_ctx->context_handle = NULL;
1288     pa_gss_ctx->open = 0;
1289
1290     return 0;
1291 }
1292
1293 static krb5_error_code
1294 pa_data_to_md_gss(krb5_context context,
1295                   const AS_REQ *a,
1296                   const krb5_creds *creds,
1297                   krb5_init_creds_context ctx,
1298                   struct pa_gss_context *pa_gss_ctx,
1299                   PA_DATA *pa,
1300                   METHOD_DATA *out_md)
1301 {
1302     krb5_error_code ret;
1303     krb5_gss_init_ctx gssic = ctx->gss_init_ctx;
1304     krb5_data req_body;
1305     krb5_data *input_token, output_token;
1306     size_t len = 0;
1307
1308     krb5_data_zero(&req_body);
1309     krb5_data_zero(&output_token);
1310
1311     input_token = pa ? &pa->padata_value : NULL;
1312
1313     if ((input_token == NULL || input_token->length == 0) &&
1314         pa_gss_ctx->context_handle) {
1315         krb5_set_error_message(context, HEIM_ERR_PA_CANT_CONTINUE,
1316                                "Missing GSS preauthentication data from KDC");
1317         return HEIM_ERR_PA_CANT_CONTINUE;
1318     }
1319
1320     ASN1_MALLOC_ENCODE(KDC_REQ_BODY, req_body.data, req_body.length,
1321                        &ctx->as_req.req_body, &len, ret);
1322     if (ret)
1323         goto out;
1324     heim_assert(req_body.length == len, "ASN.1 internal error");
1325
1326     ret = gssic->step(context, gssic, creds, &pa_gss_ctx->context_handle,
1327                       ctx->flags, &req_body,
1328                       input_token, &output_token);
1329
1330     /*
1331      * If FAST authenticated the KDC (which will be the case unless anonymous
1332      * PKINIT was used without KDC certificate validation) then we can relax
1333      * the mutual authentication requirement.
1334      */
1335     if (ret == KRB5_MUTUAL_FAILED &&
1336         (ctx->fast_state.flags & KRB5_FAST_EXPECTED) &&
1337         (ctx->fast_state.flags & KRB5_FAST_KDC_VERIFIED))
1338         ret = 0;
1339     if (ret == 0) {
1340         /*
1341          * Always require a strengthen key if FAST was used, to avoid a MITM
1342          * attack that could result in unintended privilege escalation should
1343          * the KDC add positive authorization data from the armor ticket.
1344          */
1345         if ((ctx->fast_state.flags & KRB5_FAST_EXPECTED) &&
1346             ctx->fast_state.strengthen_key == NULL) {
1347             krb5_set_error_message(context, HEIM_ERR_PA_CANT_CONTINUE,
1348                                    "FAST GSS pre-authentication without strengthen key");
1349             ret = KRB5_KDCREP_MODIFIED;
1350             goto out;
1351         }
1352
1353         pa_gss_ctx->open = 1;
1354     }
1355
1356     if (output_token.length) {
1357         ret = krb5_padata_add(context, out_md, KRB5_PADATA_GSS,
1358                               output_token.data, output_token.length);
1359         if (ret)
1360             goto out;
1361
1362         krb5_data_zero(&output_token);
1363     }
1364
1365 out:
1366     krb5_data_free(&output_token);
1367     krb5_data_free(&req_body);
1368
1369     return ret;
1370 }
1371
1372 static krb5_error_code
1373 pa_gss_step(krb5_context context,
1374             krb5_init_creds_context ctx,
1375             void *pa_ctx,
1376             PA_DATA *pa,
1377             const AS_REQ *a,
1378             const AS_REP *rep,
1379             const krb5_krbhst_info *hi,
1380             METHOD_DATA *in_md,
1381             METHOD_DATA *out_md)
1382 {
1383     krb5_error_code ret;
1384     krb5_principal cname;
1385     krb5_gss_init_ctx gssic = ctx->gss_init_ctx;
1386     struct pa_gss_context *pa_gss_ctx = pa_ctx;
1387
1388     heim_assert(gssic != NULL, "invalid context passed to pa_gss_step");
1389
1390     if (!pa_gss_ctx->open) {
1391         ret = pa_data_to_md_gss(context, a, &ctx->cred, ctx,
1392                                 pa_gss_ctx, pa, out_md);
1393         if (ret == HEIM_ERR_PA_CONTINUE_NEEDED && rep) {
1394             krb5_set_error_message(context, KRB5_PREAUTH_FAILED,
1395                                    "KDC sent AS-REP before GSS "
1396                                    "pre-authentication completed");
1397             ret = KRB5_KDCREP_MODIFIED;
1398         } else if (ret == 0 && rep == NULL) {
1399             ret = HEIM_ERR_PA_CONTINUE_NEEDED; /* odd number of legs */
1400         }
1401         if (ret)
1402             return ret;
1403     } else if (pa && pa->padata_value.length) {
1404         krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1405                                "Already completed GSS pre-authentication");
1406         return KRB5_GET_IN_TKT_LOOP;
1407     } else if (rep == NULL) {
1408         krb5_set_error_message(context, KRB5_PREAUTH_FAILED,
1409                                "Completed GSS pre-authentication before KDC");
1410         return KRB5_PREAUTH_FAILED;
1411     }
1412
1413     heim_assert(pa_gss_ctx->open,
1414                 "GSS pre-authentication incomplete");
1415
1416     ret = gssic->finish(context, gssic, &ctx->cred,
1417                         pa_gss_ctx->context_handle, ctx->nonce,
1418                         rep->enc_part.etype, &cname,
1419                         &ctx->fast_state.reply_key);
1420     if (ret)
1421         return ret;
1422
1423     {
1424         char *from = NULL;
1425         char *to = NULL;
1426
1427         if (krb5_unparse_name(context, ctx->cred.client, &from) == 0 &&
1428             krb5_unparse_name(context, cname, &to) == 0) {
1429             _krb5_debug(context, 1, "pa_gss_step: %s as %s",
1430                         from, to);
1431             krb5_xfree(from);
1432             krb5_xfree(to);
1433         }
1434     }
1435
1436     if (krb5_principal_is_federated(context, ctx->cred.client)) {
1437         /*
1438          * The well-known federated name will be replaced with the cname
1439          * in the AS-REP, but save the locally mapped initiator name in the
1440          * cred for logging.
1441          */
1442         krb5_free_principal(context, ctx->cred.client);
1443         ctx->cred.client = cname;
1444
1445         ctx->ic_flags |= KRB5_INIT_CREDS_NO_C_CANON_CHECK;
1446     } else {
1447         krb5_free_principal(context, cname);
1448     }
1449
1450     ctx->runflags.allow_save_as_reply_key = 1;
1451
1452     gssic->delete_sec_context(context, gssic, pa_gss_ctx->context_handle);
1453     pa_gss_ctx->context_handle = NULL;
1454     pa_gss_ctx->open = 0;
1455
1456     return 0;
1457 }
1458
1459 static krb5_error_code
1460 pa_gss_restart(krb5_context context,
1461                krb5_init_creds_context ctx,
1462                void *pa_ctx)
1463 {
1464     krb5_gss_init_ctx gssic = ctx->gss_init_ctx;
1465     struct pa_gss_context *pa_gss_ctx = pa_ctx;
1466
1467     if (gssic == NULL)
1468         return HEIM_ERR_PA_CANT_CONTINUE;
1469
1470     gssic->delete_sec_context(context, gssic, pa_gss_ctx->context_handle);
1471     pa_gss_ctx->context_handle = NULL;
1472     pa_gss_ctx->open = 0;
1473
1474     return 0;
1475 }
1476
1477 static void
1478 pa_gss_release(void *pa_ctx)
1479 {
1480 }
1481
1482 krb5_error_code
1483 _krb5_make_pa_enc_challenge(krb5_context context,
1484                             krb5_crypto crypto,
1485                             krb5_key_usage usage,
1486                             METHOD_DATA *md)
1487 {
1488     PA_ENC_TS_ENC p;
1489     unsigned char *buf;
1490     size_t buf_size;
1491     size_t len = 0;
1492     EncryptedData encdata;
1493     krb5_error_code ret;
1494     int32_t usec;
1495     int usec2;
1496
1497     krb5_us_timeofday (context, &p.patimestamp, &usec);
1498     usec2         = usec;
1499     p.pausec      = &usec2;
1500
1501     ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
1502     if (ret)
1503         return ret;
1504     if(buf_size != len)
1505         krb5_abortx(context, "internal error in ASN.1 encoder");
1506
1507     ret = krb5_encrypt_EncryptedData(context,
1508                                      crypto,
1509                                      usage,
1510                                      buf,
1511                                      len,
1512                                      0,
1513                                      &encdata);
1514     free(buf);
1515     if (ret)
1516         return ret;
1517
1518     ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
1519     free_EncryptedData(&encdata);
1520     if (ret)
1521         return ret;
1522     if(buf_size != len)
1523         krb5_abortx(context, "internal error in ASN.1 encoder");
1524
1525     ret = krb5_padata_add(context, md, KRB5_PADATA_ENCRYPTED_CHALLENGE, buf, len);
1526     if (ret)
1527         free(buf);
1528     return ret;
1529 }
1530
1531 krb5_error_code
1532 _krb5_validate_pa_enc_challenge(krb5_context context,
1533                                 krb5_crypto crypto,
1534                                 krb5_key_usage usage,
1535                                 EncryptedData *enc_data,
1536                                 const char *peer_name)
1537 {
1538     krb5_error_code ret;
1539     krb5_data ts_data;
1540     PA_ENC_TS_ENC p;
1541     time_t timestamp;
1542     int32_t usec;
1543     size_t size;
1544
1545     ret = krb5_decrypt_EncryptedData(context, crypto, usage, enc_data, &ts_data);
1546     if (ret)
1547         return ret;
1548
1549     ret = decode_PA_ENC_TS_ENC(ts_data.data,
1550                                ts_data.length,
1551                                &p,
1552                                &size);
1553     krb5_data_free(&ts_data);
1554     if(ret){
1555         ret = KRB5KDC_ERR_PREAUTH_FAILED;
1556         _krb5_debug(context, 5, "Failed to decode PA-ENC-TS_ENC -- %s", peer_name);
1557         goto out;
1558     }
1559
1560     krb5_us_timeofday(context, &timestamp, &usec);
1561
1562     if (krb5_time_abs(timestamp, p.patimestamp) > context->max_skew) {
1563         char client_time[100];
1564
1565         krb5_format_time(context, p.patimestamp,
1566                          client_time, sizeof(client_time), TRUE);
1567
1568         ret = KRB5KRB_AP_ERR_SKEW;
1569         _krb5_debug(context, 0, "Too large time skew, "
1570                     "client time %s is out by %u > %d seconds -- %s",
1571                     client_time,
1572                     (unsigned)krb5_time_abs(timestamp, p.patimestamp),
1573                     (int)context->max_skew,
1574                     peer_name);
1575     } else {
1576         ret = 0;
1577     }
1578
1579  out:
1580     free_PA_ENC_TS_ENC(&p);
1581
1582     return ret;
1583 }
1584
1585
1586 static struct pa_info_data *
1587 process_pa_info(krb5_context, const krb5_principal, const AS_REQ *, struct pa_info_data *, METHOD_DATA *);
1588
1589
1590 static krb5_error_code
1591 enc_chal_step(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx, PA_DATA *pa, const AS_REQ *a,
1592               const AS_REP *rep, const krb5_krbhst_info *hi, METHOD_DATA *in_md, METHOD_DATA *out_md)
1593 {
1594     struct pa_info_data paid, *ppaid;
1595     krb5_keyblock challengekey;
1596     krb5_data pepper1, pepper2;
1597     krb5_crypto crypto = NULL;
1598     krb5_enctype aenctype;
1599     krb5_error_code ret;
1600
1601     memset(&paid, 0, sizeof(paid));
1602
1603     if (rep == NULL)
1604         paid.etype = KRB5_ENCTYPE_NULL;
1605     else
1606         paid.etype = rep->enc_part.etype;
1607     ppaid = process_pa_info(context, ctx->cred.client, a, &paid, in_md);
1608
1609     /*
1610      * If we don't have ppaid, ts because the KDC have not sent any
1611      * salt info, lets to the first roundtrip so the KDC have a chance
1612      * to send any.
1613      */
1614     if (ppaid == NULL) {
1615         _krb5_debug(context, 5, "no ppaid found");
1616         return HEIM_ERR_PA_CONTINUE_NEEDED;
1617     }
1618     if (ppaid->etype == KRB5_ENCTYPE_NULL) {
1619         return HEIM_ERR_PA_CANT_CONTINUE;
1620     }
1621
1622     if (ctx->fast_state.reply_key)
1623         krb5_free_keyblock(context, ctx->fast_state.reply_key);
1624
1625     ret = pa_data_to_key_plain(context, ctx->cred.client, ctx,
1626                                ppaid->salt, ppaid->s2kparams, ppaid->etype,
1627                                &ctx->fast_state.reply_key);
1628     free_paid(context, &paid);
1629     if (ret) {
1630         _krb5_debug(context, 5, "enc-chal: failed to build key");
1631         return ret;
1632     }
1633
1634     ret = krb5_crypto_init(context, ctx->fast_state.reply_key, 0, &crypto);
1635     if (ret)
1636         return ret;
1637
1638     krb5_crypto_getenctype(context, ctx->fast_state.armor_crypto, &aenctype);
1639
1640     pepper1.data = rep ? "kdcchallengearmor" : "clientchallengearmor";
1641     pepper1.length = strlen(pepper1.data);
1642     pepper2.data = "challengelongterm";
1643     pepper2.length = strlen(pepper2.data);
1644
1645     ret = krb5_crypto_fx_cf2(context, ctx->fast_state.armor_crypto, crypto,
1646                              &pepper1, &pepper2, aenctype,
1647                              &challengekey);
1648     krb5_crypto_destroy(context, crypto);
1649     if (ret)
1650         return ret;
1651
1652     ret = krb5_crypto_init(context, &challengekey, 0, &crypto);
1653     krb5_free_keyblock_contents(context, &challengekey);
1654     if (ret)
1655         return ret;
1656
1657     if (rep) {
1658         EncryptedData enc_data;
1659         size_t size;
1660
1661         if (ret) {
1662             _krb5_debug(context, 5, "enc-chal: failed to create reply key");
1663             return ret;
1664         }
1665
1666         _krb5_debug(context, 5, "ENC_CHAL rep key");
1667
1668         if (ctx->fast_state.strengthen_key == NULL) {
1669             krb5_crypto_destroy(context, crypto);
1670             _krb5_debug(context, 5, "ENC_CHAL w/o strengthen_key");
1671             return KRB5_KDCREP_MODIFIED;
1672         }
1673
1674         if (pa == NULL) {
1675             krb5_crypto_destroy(context, crypto);
1676             _krb5_debug(context, 0, "KDC response missing");
1677             return HEIM_ERR_PA_CANT_CONTINUE;
1678         }
1679
1680         ret = decode_EncryptedData(pa->padata_value.data,
1681                                    pa->padata_value.length,
1682                                    &enc_data,
1683                                    &size);
1684         if (ret) {
1685             ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1686             _krb5_debug(context, 5, "Failed to decode ENC_CHAL KDC reply");
1687             return ret;
1688         }
1689
1690         ret = _krb5_validate_pa_enc_challenge(context, crypto,
1691                                               KRB5_KU_ENC_CHALLENGE_KDC,
1692                                               &enc_data,
1693                                               "KDC");
1694         free_EncryptedData(&enc_data);
1695         krb5_crypto_destroy(context, crypto);
1696
1697         return ret;
1698
1699     } else {
1700
1701         ret = _krb5_make_pa_enc_challenge(context, crypto,
1702                                           KRB5_KU_ENC_CHALLENGE_CLIENT,
1703                                           out_md);
1704         krb5_crypto_destroy(context, crypto);
1705         if (ret) {
1706             _krb5_debug(context, 5, "enc-chal: failed build enc challenge");
1707             return ret;
1708         }
1709
1710         return HEIM_ERR_PA_CONTINUE_NEEDED;
1711     }
1712 }
1713
1714 struct enc_ts_context {
1715     int used_pa_types;
1716 #define  USED_ENC_TS_GUESS      4
1717 #define  USED_ENC_TS_INFO       8
1718 #define  USED_ENC_TS_RENEG      16
1719     krb5_principal user;
1720 };
1721
1722 static krb5_error_code
1723 enc_ts_restart(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx)
1724 {
1725     struct enc_ts_context *pactx = (struct enc_ts_context *)pa_ctx;
1726     pactx->used_pa_types = 0;
1727     krb5_free_principal(context, pactx->user);
1728     pactx->user = NULL;
1729     return 0;
1730 }
1731
1732 static krb5_error_code
1733 enc_ts_step(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx, PA_DATA *pa,
1734             const AS_REQ *a,
1735             const AS_REP *rep,
1736             const krb5_krbhst_info *hi,
1737             METHOD_DATA *in_md, METHOD_DATA *out_md)
1738 {
1739     struct enc_ts_context *pactx = (struct enc_ts_context *)pa_ctx;
1740     struct pa_info_data paid, *ppaid;
1741     krb5_error_code ret;
1742     const char *state;
1743     unsigned flag;
1744
1745     /*
1746      * Keep track of the user we used so that we can restart
1747      * authentication when we get referrals.
1748      */
1749
1750     if (pactx->user && !krb5_principal_compare(context, pactx->user, ctx->cred.client)) {
1751         pactx->used_pa_types = 0;
1752         krb5_free_principal(context, pactx->user);
1753         pactx->user = NULL;
1754     }
1755
1756     if (pactx->user == NULL) {
1757         ret = krb5_copy_principal(context, ctx->cred.client, &pactx->user);
1758         if (ret)
1759             return ret;
1760     }
1761
1762     memset(&paid, 0, sizeof(paid));
1763
1764     if (rep == NULL)
1765         paid.etype = KRB5_ENCTYPE_NULL;
1766     else
1767         paid.etype = rep->enc_part.etype;
1768
1769     ppaid = process_pa_info(context, ctx->cred.client, a, &paid, in_md);
1770
1771     if (rep) {
1772         /*
1773          * Some KDC's don't send salt info in the reply when there is
1774          * success pre-auth happned before, so use cached copy (or
1775          * even better, if there is just one pre-auth, save reply-key).
1776          */
1777         if (ppaid == NULL && ctx->paid.etype != KRB5_ENCTYPE_NULL) {
1778             ppaid = &ctx->paid;
1779
1780         } else if (ppaid == NULL) {
1781             _krb5_debug(context, 0, "no paid when building key, build a default salt structure ?");
1782             return HEIM_ERR_PA_CANT_CONTINUE;
1783         }
1784
1785         ret = pa_data_to_key_plain(context, ctx->cred.client, ctx,
1786                                    ppaid->salt, ppaid->s2kparams, rep->enc_part.etype,
1787                                    &ctx->fast_state.reply_key);
1788         free_paid(context, &paid);
1789         return ret;
1790     }
1791
1792     /*
1793      * If we don't have ppaid, ts because the KDC have not sent any
1794      * salt info, lets to the first roundtrip so the KDC have a chance
1795      * to send any.
1796      *
1797      * Don't bother guessing, it sounds like a good idea until you run
1798      * into KDCs that are doing failed auth counting based on the
1799      * ENC_TS tries.
1800      *
1801      * Stashing the salt for the next run is a diffrent issue and
1802      * could be considered in the future.
1803      */
1804
1805     if (ppaid == NULL) {
1806         _krb5_debug(context, 5,
1807                      "TS-ENC: waiting for KDC to set pw-salt/etype_info{,2}");
1808         return HEIM_ERR_PA_CONTINUE_NEEDED;
1809     }
1810     if (ppaid->etype == KRB5_ENCTYPE_NULL) {
1811         free_paid(context, &paid);
1812         _krb5_debug(context, 5,
1813                      "TS-ENC: kdc proposes enctype NULL ?");
1814         return HEIM_ERR_PA_CANT_CONTINUE;
1815     }
1816
1817     /*
1818      * We have to allow the KDC to re-negotiate the PA-TS data
1819      * once, this is since the in the case of a windows read only
1820      * KDC that doesn't have the keys simply guesses what the
1821      * master is supposed to support. In the case where this
1822      * breaks in when the RO-KDC is a newer version the the RW-KDC
1823      * and the RO-KDC announced a enctype that the older doesn't
1824      * support.
1825      */
1826     if (pactx->used_pa_types & USED_ENC_TS_INFO) {
1827         flag = USED_ENC_TS_RENEG;
1828         state = "reneg";
1829     } else {
1830         flag = USED_ENC_TS_INFO;
1831         state = "info";
1832     }
1833
1834     if (pactx->used_pa_types & flag) {
1835         free_paid(context, &paid);
1836         krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1837                                "Already tried ENC-TS-%s, looping", state);
1838         return KRB5_GET_IN_TKT_LOOP;
1839     }
1840
1841     pactx->used_pa_types |= flag;
1842
1843     free_paid(context, &ctx->paid);
1844     ctx->paid = *ppaid;
1845
1846     ret = pa_data_to_md_ts_enc(context, a, ctx->cred.client, ctx, ppaid, out_md);
1847     if (ret)
1848         return ret;
1849
1850     return HEIM_ERR_PA_CONTINUE_NEEDED;
1851 }
1852
1853 static void
1854 enc_ts_release(void *pa_ctx)
1855 {
1856     struct enc_ts_context *pactx = (struct enc_ts_context *)pa_ctx;
1857
1858     if (pactx->user)
1859         krb5_free_principal(NULL, pactx->user);
1860 }
1861
1862 static krb5_error_code
1863 pa_pac_step(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx, PA_DATA *pa, const AS_REQ *a,
1864             const AS_REP *rep, const krb5_krbhst_info *hi,
1865             METHOD_DATA *in_md, METHOD_DATA *out_md)
1866 {
1867     size_t len = 0, length;
1868     krb5_error_code ret;
1869     PA_PAC_REQUEST req;
1870     void *buf;
1871
1872     switch (ctx->req_pac) {
1873     case KRB5_INIT_CREDS_TRISTATE_UNSET:
1874         return 0; /* don't bother */
1875     case KRB5_INIT_CREDS_TRISTATE_TRUE:
1876         req.include_pac = 1;
1877         break;
1878     case KRB5_INIT_CREDS_TRISTATE_FALSE:
1879         req.include_pac = 0;
1880     }
1881
1882     ASN1_MALLOC_ENCODE(PA_PAC_REQUEST, buf, length,
1883                        &req, &len, ret);
1884     if (ret)
1885         return ret;
1886     heim_assert(len == length, "internal error in ASN.1 encoder");
1887
1888     ret = krb5_padata_add(context, out_md, KRB5_PADATA_PA_PAC_REQUEST, buf, len);
1889     if (ret)
1890         free(buf);
1891
1892     return 0;
1893 }
1894
1895 static krb5_error_code
1896 pa_enc_pa_rep_step(krb5_context context, krb5_init_creds_context ctx, void *pa_ctx, PA_DATA *pa, const AS_REQ *a,
1897                    const AS_REP *rep, const krb5_krbhst_info *hi,
1898                    METHOD_DATA *in_md, METHOD_DATA *out_md)
1899 {
1900     if (ctx->runflags.allow_enc_pa_rep)
1901         return krb5_padata_add(context, out_md, KRB5_PADATA_REQ_ENC_PA_REP, NULL, 0);
1902
1903     return 0;
1904 }
1905
1906 static krb5_error_code
1907 pa_fx_cookie_step(krb5_context context,
1908                   krb5_init_creds_context ctx,
1909                   void *pa_ctx,
1910                   PA_DATA *pa,
1911                   const AS_REQ *a,
1912                   const AS_REP *rep,
1913                   const krb5_krbhst_info *hi,
1914                   METHOD_DATA *in_md,
1915                   METHOD_DATA *out_md)
1916 {
1917     krb5_error_code ret;
1918     void *cookie;
1919     PA_DATA *pad;
1920     int idx = 0;
1921
1922     pad = krb5_find_padata(in_md->val, in_md->len, KRB5_PADATA_FX_COOKIE, &idx);
1923     if (pad == NULL) {
1924         /*
1925          * RFC 6113 5.4.3: PA-FX-COOKIE MUST be included if the KDC
1926          * expects at least one more message from the client.
1927          */
1928         if (ctx->error.error_code == KRB5_KDC_ERR_MORE_PREAUTH_DATA_REQUIRED)
1929             return KRB5_PREAUTH_FAILED;
1930         else
1931             return 0;
1932     }
1933
1934     cookie = malloc(pad->padata_value.length);
1935     if (cookie == NULL)
1936         return krb5_enomem(context);
1937
1938     memcpy(cookie, pad->padata_value.data, pad->padata_value.length);
1939
1940     ret = krb5_padata_add(context, out_md, KRB5_PADATA_FX_COOKIE,
1941                           cookie, pad->padata_value.length);
1942     if (ret)
1943         free(cookie);
1944     else
1945         _krb5_debug(context, 5, "Mirrored FX-COOKIE to KDC");
1946
1947     return ret;
1948 }
1949
1950 typedef struct pa_info_data *(*pa_salt_info_f)(krb5_context, const krb5_principal, const AS_REQ *, struct pa_info_data *, heim_octet_string *);
1951 typedef krb5_error_code (*pa_configure_f)(krb5_context, krb5_init_creds_context, void *);
1952 typedef krb5_error_code (*pa_restart_f)(krb5_context, krb5_init_creds_context, void *);
1953 typedef krb5_error_code (*pa_step_f)(krb5_context, krb5_init_creds_context, void *, PA_DATA *, const AS_REQ *, const AS_REP *, const krb5_krbhst_info *, METHOD_DATA *, METHOD_DATA *);
1954 typedef void            (*pa_release_f)(void *);
1955
1956 struct patype {
1957     int type;
1958     char *name;
1959     int flags;
1960 #define PA_F_ANNOUNCE           1
1961 #define PA_F_CONFIG             2
1962 #define PA_F_FAST               4 /* available inside FAST */
1963 #define PA_F_NOT_FAST           8 /* only available without FAST */
1964     size_t pa_ctx_size;
1965     pa_salt_info_f salt_info;
1966     /**
1967      * Return 0 if the PA-mechanism is available and optionally set pa_ctx pointer to non-NULL.
1968      */
1969     pa_configure_f configure;
1970     /**
1971      * Return 0 if the PA-mechanism can be restarted (time skew, referrals, etc)
1972      */
1973     pa_restart_f restart;
1974     /**
1975      * Return 0 if the when complete, HEIM_ERR_PA_CONTINUE_NEEDED if more steps are require
1976      */
1977     pa_step_f step;
1978     pa_release_f release;
1979 } patypes[] = {
1980     {
1981         KRB5_PADATA_PK_AS_REP,
1982         "PKINIT(IETF)",
1983         PA_F_FAST | PA_F_NOT_FAST,
1984         sizeof(struct pkinit_context),
1985         NULL,
1986         pkinit_configure_ietf,
1987         NULL,
1988         pkinit_step,
1989         pkinit_release
1990     },
1991     {
1992         KRB5_PADATA_PK_AS_REP_19,
1993         "PKINIT(win)",
1994         PA_F_FAST | PA_F_NOT_FAST,
1995         sizeof(struct pkinit_context),
1996         NULL,
1997         pkinit_configure_win,
1998         NULL,
1999         pkinit_step,
2000         pkinit_release
2001     },
2002     {
2003         KRB5_PADATA_GSS,
2004         "GSS",
2005         PA_F_FAST | PA_F_NOT_FAST,
2006         sizeof(struct pa_gss_context),
2007         NULL,
2008         pa_gss_configure,
2009         pa_gss_restart,
2010         pa_gss_step,
2011         pa_gss_release
2012     },
2013     {
2014         KRB5_PADATA_ENCRYPTED_CHALLENGE,
2015         "ENCRYPTED_CHALLENGE",
2016         PA_F_FAST,
2017         0,
2018         NULL,
2019         NULL,
2020         NULL,
2021         enc_chal_step,
2022         NULL
2023     },
2024     {
2025         KRB5_PADATA_ENC_TIMESTAMP,
2026         "ENCRYPTED_TIMESTAMP",
2027         PA_F_NOT_FAST,
2028         sizeof(struct enc_ts_context),
2029         NULL,
2030         NULL,
2031         enc_ts_restart,
2032         enc_ts_step,
2033         enc_ts_release
2034     },
2035     {
2036         KRB5_PADATA_PA_PAC_REQUEST,
2037         "PA_PAC_REQUEST",
2038         PA_F_CONFIG,
2039         0,
2040         NULL,
2041         NULL,
2042         NULL,
2043         pa_pac_step,
2044         NULL
2045     },
2046     {
2047         KRB5_PADATA_REQ_ENC_PA_REP,
2048         "REQ-ENC-PA-REP",
2049         PA_F_CONFIG,
2050         0,
2051         NULL,
2052         NULL,
2053         NULL,
2054         pa_enc_pa_rep_step,
2055         NULL
2056     },
2057     {
2058         KRB5_PADATA_FX_COOKIE,
2059         "FX-COOKIE",
2060         PA_F_CONFIG,
2061         0,
2062         NULL,
2063         NULL,
2064         NULL,
2065         pa_fx_cookie_step,
2066         NULL
2067     },
2068 #define patype_salt(n, f) { KRB5_PADATA_##n, #n, 0, 0, f, NULL, NULL, NULL, NULL }
2069     patype_salt(ETYPE_INFO2, pa_etype_info2),
2070     patype_salt(ETYPE_INFO, pa_etype_info),
2071     patype_salt(PW_SALT, pa_pw_or_afs3_salt),
2072     patype_salt(AFS3_SALT, pa_pw_or_afs3_salt),
2073 #undef patype_salt
2074     /* below are just for pretty printing */
2075 #define patype_info(n) { KRB5_PADATA_##n, #n, 0, 0, NULL, NULL, NULL, NULL, NULL }
2076     patype_info(AUTHENTICATION_SET),
2077     patype_info(AUTH_SET_SELECTED),
2078     patype_info(FX_FAST),
2079     patype_info(FX_ERROR),
2080     patype_info(PKINIT_KX),
2081     patype_info(PK_AS_REQ)
2082 #undef patype_info
2083 };
2084
2085 static const char *
2086 get_pa_type_name(int type)
2087 {
2088     size_t n;
2089     for (n = 0; n < sizeof(patypes)/sizeof(patypes[0]); n++)
2090         if (type == patypes[n].type)
2091             return patypes[n].name;
2092     return "unknown";
2093 }
2094
2095 /*
2096  *
2097  */
2098
2099 struct pa_auth_mech {
2100     struct patype *patype;
2101     struct pa_auth_mech *next; /* when doing authentication sets */
2102     char pactx[1];
2103 };
2104
2105 /*
2106  *
2107  */
2108
2109 static struct pa_info_data *
2110 process_pa_info(krb5_context context,
2111                 const krb5_principal client,
2112                 const AS_REQ *asreq,
2113                 struct pa_info_data *paid,
2114                 METHOD_DATA *md)
2115 {
2116     struct pa_info_data *p = NULL;
2117     PA_DATA *pa;
2118     size_t i;
2119
2120     if (md == NULL)
2121         return NULL;
2122
2123     for (i = 0; p == NULL && i < sizeof(patypes)/sizeof(patypes[0]); i++) {
2124         int idx = 0;
2125
2126         if (patypes[i].salt_info == NULL)
2127             continue;
2128
2129         pa = krb5_find_padata(md->val, md->len, patypes[i].type, &idx);
2130         if (pa == NULL)
2131             continue;
2132
2133         paid->salt.salttype = (krb5_salttype)patypes[i].type;
2134         p = patypes[i].salt_info(context, client, asreq, paid, &pa->padata_value);
2135     }
2136     return p;
2137 }
2138
2139 static void
2140 pa_announce(krb5_context context,
2141             int types,
2142             krb5_init_creds_context ctx,
2143             METHOD_DATA *in_md,
2144             METHOD_DATA *out_md)
2145 {
2146     size_t n;
2147
2148     for (n = 0; n < sizeof(patypes)/sizeof(patypes[0]); n++) {
2149         if ((patypes[n].flags & types) == 0)
2150             continue;
2151
2152         if (patypes[n].step)
2153             patypes[n].step(context, ctx, NULL, NULL, NULL, NULL, NULL, in_md, out_md);
2154         else
2155             krb5_padata_add(context, out_md, patypes[n].type, NULL, 0);
2156     }
2157 }
2158
2159
2160 static void
2161 mech_dealloc(void *ctx)
2162 {
2163     struct pa_auth_mech *pa_mech = ctx;
2164     if (pa_mech->patype->release)
2165         pa_mech->patype->release((void *)&pa_mech->pactx[0]);
2166 }
2167
2168 struct heim_type_data pa_auth_mech_object = {
2169     HEIM_TID_PA_AUTH_MECH,
2170     "heim-pa-mech-context",
2171     NULL,
2172     mech_dealloc,
2173     NULL,
2174     NULL,
2175     NULL,
2176     NULL
2177 };
2178
2179 static struct pa_auth_mech *
2180 pa_mech_create(krb5_context context, krb5_init_creds_context ctx, int pa_type)
2181 {
2182     struct pa_auth_mech *pa_mech;
2183     struct patype *patype = NULL;
2184     size_t n;
2185
2186     for (n = 0; patype == NULL && n < sizeof(patypes)/sizeof(patypes[0]); n++) {
2187         if (patypes[n].type == pa_type)
2188             patype = &patypes[n];
2189     }
2190     if (patype == NULL)
2191         return NULL;
2192
2193     pa_mech = _heim_alloc_object(&pa_auth_mech_object, sizeof(*pa_mech) - 1 + patype->pa_ctx_size);
2194     if (pa_mech == NULL)
2195         return NULL;
2196
2197     pa_mech->patype = patype;
2198
2199     if (pa_mech->patype->configure) {
2200         krb5_error_code ret;
2201
2202         ret = pa_mech->patype->configure(context, ctx, &pa_mech->pactx[0]);
2203         if (ret) {
2204             heim_release(pa_mech);
2205             return NULL;
2206         }
2207     }
2208
2209     _krb5_debug(context, 5, "Adding PA mech: %s", patype->name);
2210
2211     return pa_mech;
2212 }
2213
2214 static void
2215 pa_mech_add(krb5_context context, krb5_init_creds_context ctx, int pa_type)
2216 {
2217     struct pa_auth_mech *mech;
2218
2219     mech = pa_mech_create(context, ctx, pa_type);
2220     if (mech) {
2221         heim_array_append_value(ctx->available_pa_mechs, mech);
2222         heim_release(mech);
2223     }
2224 }
2225
2226 static krb5_error_code
2227 pa_configure(krb5_context context,
2228              krb5_init_creds_context ctx,
2229              METHOD_DATA *in_md)
2230 {
2231     ctx->available_pa_mechs = heim_array_create();
2232
2233     if (ctx->gss_init_ctx) {
2234         pa_mech_add(context, ctx, KRB5_PADATA_GSS);
2235     } else if (ctx->pk_init_ctx) {
2236         pa_mech_add(context, ctx, KRB5_PADATA_PK_AS_REP);
2237         pa_mech_add(context, ctx, KRB5_PADATA_PK_AS_REP_19);
2238     } else if (ctx->keyproc || ctx->keyseed || ctx->prompter) {
2239         pa_mech_add(context, ctx, KRB5_PADATA_ENCRYPTED_CHALLENGE);
2240         pa_mech_add(context, ctx, KRB5_PADATA_ENC_TIMESTAMP);
2241     }
2242     /* XXX setup context based on KDC reply */
2243
2244     return 0;
2245 }
2246
2247 static krb5_error_code
2248 pa_restart(krb5_context context,
2249            krb5_init_creds_context ctx)
2250 {
2251     krb5_error_code ret = HEIM_ERR_PA_CANT_CONTINUE;
2252
2253     if (ctx->pa_mech && ctx->pa_mech->patype->restart)
2254         ret = ctx->pa_mech->patype->restart(context, ctx, (void *)&ctx->pa_mech->pactx[0]);
2255
2256     return ret;
2257 }
2258
2259
2260 static krb5_error_code
2261 pa_step(krb5_context context,
2262         krb5_init_creds_context ctx,
2263         const AS_REQ *a,
2264         const AS_REP *rep,
2265         const krb5_krbhst_info *hi,
2266         METHOD_DATA *in_md,
2267         METHOD_DATA *out_md)
2268 {
2269     krb5_error_code ret;
2270     PA_DATA *pa = NULL;
2271     int idx;
2272
2273  next:
2274     do {
2275         if (ctx->pa_mech == NULL) {
2276             size_t len = heim_array_get_length(ctx->available_pa_mechs);
2277             if (len == 0) {
2278                 _krb5_debug(context, 0, "no more available_pa_mechs to try");
2279                 return HEIM_ERR_NO_MORE_PA_MECHS;
2280             }
2281
2282             ctx->pa_mech = heim_array_copy_value(ctx->available_pa_mechs, 0);
2283             heim_array_delete_value(ctx->available_pa_mechs, 0);
2284         }
2285
2286         if (ctx->fast_state.armor_crypto) {
2287             if ((ctx->pa_mech->patype->flags & PA_F_FAST) == 0) {
2288                 _krb5_debug(context, 0, "pa-mech %s dropped under FAST (not supported)",
2289                             ctx->pa_mech->patype->name);
2290                 heim_release(ctx->pa_mech);
2291                 ctx->pa_mech = NULL;
2292                 continue;
2293             }
2294         } else {
2295             if ((ctx->pa_mech->patype->flags & PA_F_NOT_FAST) == 0) {
2296                 _krb5_debug(context, 0, "dropped pa-mech %s since not running under FAST",
2297                             ctx->pa_mech->patype->name);
2298                 heim_release(ctx->pa_mech);
2299                 ctx->pa_mech = NULL;
2300                 continue;
2301             }
2302         }
2303
2304         _krb5_debug(context, 0, "pa-mech trying: %s, searching for %d",
2305                     ctx->pa_mech->patype->name, ctx->pa_mech->patype->type);
2306
2307         idx = 0;
2308         if (in_md)
2309             pa = krb5_find_padata(in_md->val, in_md->len, ctx->pa_mech->patype->type, &idx);
2310         else
2311             pa = NULL;
2312
2313     } while (ctx->pa_mech == NULL);
2314
2315     _krb5_debug(context, 5, "Stepping pa-mech: %s", ctx->pa_mech->patype->name);
2316
2317     ret = ctx->pa_mech->patype->step(context, ctx, (void *)&ctx->pa_mech->pactx[0], pa, a, rep, hi, in_md, out_md);
2318     _krb5_debug(context, 10, "PA type %s returned %d", ctx->pa_mech->patype->name, ret);
2319     if (ret == 0) {
2320         struct pa_auth_mech *next_pa = ctx->pa_mech->next;
2321
2322         if (next_pa) {
2323             _krb5_debug(context, 5, "Next PA type in set is: %s",
2324                          next_pa->patype->name);
2325             ret = HEIM_ERR_PA_CONTINUE_NEEDED;
2326         } else if (rep == NULL) {
2327             _krb5_debug(context, 5, "PA %s done, but no ticket in sight!!!",
2328                          ctx->pa_mech->patype->name);
2329             ret = HEIM_ERR_PA_CANT_CONTINUE;
2330         } else {
2331             ctx->pa_used = ctx->pa_mech->patype->name;
2332         }
2333
2334         heim_retain(next_pa);
2335         heim_release(ctx->pa_mech);
2336         ctx->pa_mech = next_pa;
2337     }
2338
2339     if (ret == HEIM_ERR_PA_CANT_CONTINUE) {
2340         if (ctx->pa_mech) {
2341             _krb5_debug(context, 5, "Dropping PA type %s", ctx->pa_mech->patype->name);
2342             heim_release(ctx->pa_mech);
2343             ctx->pa_mech = NULL;
2344         }
2345         goto next;
2346     } else if (ret == HEIM_ERR_PA_CONTINUE_NEEDED) {
2347         _krb5_debug(context, 5, "Continue needed for %s", ctx->pa_mech->patype->name);
2348     } else if (ret != 0) {
2349         _krb5_debug(context, 5, "Other error from mech %s: %d", ctx->pa_mech->patype->name, ret);
2350         heim_release(ctx->pa_mech);
2351         ctx->pa_mech = NULL;
2352     }
2353
2354     return ret;
2355 }
2356
2357 static void
2358 log_kdc_pa_types(krb5_context context, METHOD_DATA *in_md)
2359 {
2360     if (_krb5_have_debug(context, 5)) {
2361         unsigned i;
2362         _krb5_debug(context, 5, "KDC sent %d patypes", in_md->len);
2363         for (i = 0; i < in_md->len; i++)
2364             _krb5_debug(context, 5, "KDC sent PA-DATA type: %d (%s)",
2365                          in_md->val[i].padata_type,
2366                          get_pa_type_name(in_md->val[i].padata_type));
2367     }
2368 }
2369
2370 /*
2371  * Assumes caller always will free `out_md', even on error.
2372  */
2373
2374 static krb5_error_code
2375 process_pa_data_to_md(krb5_context context,
2376                       const krb5_creds *creds,
2377                       const AS_REQ *a,
2378                       krb5_init_creds_context ctx,
2379                       METHOD_DATA *in_md,
2380                       METHOD_DATA **out_md)
2381 {
2382     krb5_error_code ret;
2383
2384     ALLOC(*out_md, 1);
2385     if (*out_md == NULL) {
2386         return krb5_enomem(context);
2387     }
2388     (*out_md)->len = 0;
2389     (*out_md)->val = NULL;
2390
2391     log_kdc_pa_types(context, in_md);
2392
2393     ret = pa_step(context, ctx, a, NULL, NULL, in_md, *out_md);
2394     if (ret == HEIM_ERR_PA_CONTINUE_NEEDED) {
2395         _krb5_debug(context, 0, "pamech need more stepping");
2396     } else if (ret == 0) {
2397         _krb5_debug(context, 0, "pamech done step");
2398     } else {
2399         return ret;
2400     }
2401
2402     /*
2403      * Send announcement (what we support) and configuration (user
2404      * introduced behavior change)
2405      */
2406
2407     pa_announce(context, PA_F_ANNOUNCE|PA_F_CONFIG, ctx, in_md, *out_md);
2408
2409     /*
2410      *
2411      */
2412
2413     if ((*out_md)->len == 0) {
2414         free(*out_md);
2415         *out_md = NULL;
2416     }
2417
2418     return 0;
2419 }
2420
2421 static krb5_error_code
2422 process_pa_data_to_key(krb5_context context,
2423                        krb5_init_creds_context ctx,
2424                        krb5_creds *creds,
2425                        AS_REQ *a,
2426                        AS_REP *rep,
2427                        const krb5_krbhst_info *hi,
2428                        krb5_keyblock **key)
2429 {
2430     struct pa_info_data paid, *ppaid = NULL;
2431     krb5_error_code ret;
2432     krb5_enctype etype = rep->enc_part.etype;
2433
2434     memset(&paid, 0, sizeof(paid));
2435
2436     if (rep->padata)
2437         log_kdc_pa_types(context, rep->padata);
2438
2439     if (rep->padata) {
2440         paid.etype = etype;
2441         ppaid = process_pa_info(context, creds->client, a, &paid,
2442                                 rep->padata);
2443     }
2444     if (ppaid == NULL) {
2445         if (ctx->paid.etype == KRB5_ENCTYPE_NULL) {
2446             ctx->paid.etype = etype;
2447             ctx->paid.s2kparams = NULL;
2448             ret = krb5_get_pw_salt (context, creds->client, &ctx->paid.salt);
2449             if (ret)
2450                 return ret;
2451         }
2452     }
2453
2454     ret = pa_step(context, ctx, a, rep, hi, rep->padata, NULL);
2455     if (ret == HEIM_ERR_PA_CONTINUE_NEEDED) {
2456         _krb5_debug(context, 0, "In final stretch and pa require more stepping ?");
2457         return ret;
2458     } else if (ret == 0) {
2459         _krb5_debug(context, 0, "final pamech done step");
2460         goto out;
2461     } else {
2462         return ret;
2463     }
2464  out:
2465     free_paid(context, &paid);
2466     return ret;
2467 }
2468
2469 /*
2470  *
2471  */
2472
2473 static krb5_error_code
2474 capture_lkdc_domain(krb5_context context,
2475                     krb5_init_creds_context ctx)
2476 {
2477     size_t len;
2478
2479     len = strlen(_krb5_wellknown_lkdc);
2480
2481     if (ctx->kdc_hostname != NULL ||
2482         strncmp(ctx->cred.client->realm, _krb5_wellknown_lkdc, len) != 0 ||
2483         ctx->cred.client->realm[len] != ':')
2484         return 0;
2485
2486     ctx->kdc_hostname = strdup(&ctx->cred.client->realm[len + 1]);
2487
2488     _krb5_debug(context, 5, "krb5_get_init_creds: setting LKDC hostname to: %s",
2489                 ctx->kdc_hostname);
2490     return 0;
2491 }
2492
2493 /**
2494  * Start a new context to get a new initial credential.
2495  *
2496  * @param context A Kerberos 5 context.
2497  * @param client The Kerberos principal to get the credential for, if
2498  *     NULL is given, the default principal is used as determined by
2499  *     krb5_get_default_principal().
2500  * @param prompter
2501  * @param prompter_data
2502  * @param start_time the time the ticket should start to be valid or 0 for now.
2503  * @param options a options structure, can be NULL for default options.
2504  * @param rctx A new allocated free with krb5_init_creds_free().
2505  *
2506  * @return 0 for success or an Kerberos 5 error code, see krb5_get_error_message().
2507  *
2508  * @ingroup krb5_credential
2509  */
2510
2511 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2512 krb5_init_creds_init(krb5_context context,
2513                      krb5_principal client,
2514                      krb5_prompter_fct prompter,
2515                      void *prompter_data,
2516                      krb5_deltat start_time,
2517                      krb5_get_init_creds_opt *options,
2518                      krb5_init_creds_context *rctx)
2519 {
2520     krb5_init_creds_context ctx;
2521     krb5_error_code ret;
2522
2523     *rctx = NULL;
2524
2525     ctx = calloc(1, sizeof(*ctx));
2526     if (ctx == NULL)
2527         return krb5_enomem(context);
2528
2529     ret = get_init_creds_common(context, client, prompter, prompter_data,
2530                                  start_time, options, ctx);
2531     if (ret) {
2532         free(ctx);
2533         return ret;
2534     }
2535
2536     /* Set a new nonce. */
2537     /* FIXME should generate a new nonce for each AS-REQ */
2538     krb5_generate_random_block (&ctx->nonce, sizeof(ctx->nonce));
2539     ctx->nonce &= 0x7fffffff;
2540     /* XXX these just needs to be the same when using Windows PK-INIT */
2541     ctx->pk_nonce = ctx->nonce;
2542
2543     ctx->prompter = prompter;
2544     ctx->prompter_data = prompter_data;
2545
2546     /* pick up hostname from LKDC realm name */
2547     ret = capture_lkdc_domain(context, ctx);
2548     if (ret) {
2549         free_init_creds_ctx(context, ctx);
2550         return ret;
2551     }
2552
2553     ctx->runflags.allow_enc_pa_rep = 1;
2554
2555     ctx->fast_state.flags |= KRB5_FAST_AS_REQ;
2556
2557     *rctx = ctx;
2558
2559     return ret;
2560 }
2561
2562 /**
2563  * Set the KDC hostname for the initial request, it will not be
2564  * considered in referrals to another KDC.
2565  *
2566  * @param context a Kerberos 5 context.
2567  * @param ctx a krb5_init_creds_context context.
2568  * @param hostname the hostname for the KDC of realm
2569  *
2570  * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
2571  * @ingroup krb5_credential
2572  */
2573
2574 krb5_error_code KRB5_LIB_FUNCTION
2575 krb5_init_creds_set_kdc_hostname(krb5_context context,
2576                                  krb5_init_creds_context ctx,
2577                                  const char *hostname)
2578 {
2579     if (ctx->kdc_hostname)
2580         free(ctx->kdc_hostname);
2581     ctx->kdc_hostname = strdup(hostname);
2582     if (ctx->kdc_hostname == NULL)
2583         return krb5_enomem(context);
2584     return 0;
2585 }
2586
2587 /**
2588  * Set the sitename for the request
2589  *
2590  */
2591
2592 krb5_error_code KRB5_LIB_FUNCTION
2593 krb5_init_creds_set_sitename(krb5_context context,
2594                              krb5_init_creds_context ctx,
2595                              const char *sitename)
2596 {
2597     if (ctx->sitename)
2598         free(ctx->sitename);
2599     ctx->sitename = strdup(sitename);
2600     if (ctx->sitename == NULL)
2601         return krb5_enomem(context);
2602     return 0;
2603 }
2604
2605 /**
2606  * Sets the service that the is requested. This call is only neede for
2607  * special initial tickets, by default the a krbtgt is fetched in the default realm.
2608  *
2609  * @param context a Kerberos 5 context.
2610  * @param ctx a krb5_init_creds_context context.
2611  * @param service the service given as a string, for example
2612  *        "kadmind/admin". If NULL, the default krbtgt in the clients
2613  *        realm is set.
2614  *
2615  * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
2616  * @ingroup krb5_credential
2617  */
2618
2619 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2620 krb5_init_creds_set_service(krb5_context context,
2621                             krb5_init_creds_context ctx,
2622                             const char *service)
2623 {
2624     krb5_const_realm client_realm;
2625     krb5_principal principal;
2626     krb5_error_code ret;
2627
2628     client_realm = krb5_principal_get_realm (context, ctx->cred.client);
2629
2630     if (service) {
2631         ret = krb5_parse_name (context, service, &principal);
2632         if (ret)
2633             return ret;
2634         krb5_principal_set_realm (context, principal, client_realm);
2635     } else {
2636         ret = krb5_make_principal(context, &principal,
2637                                   client_realm, KRB5_TGS_NAME, client_realm,
2638                                   NULL);
2639         if (ret)
2640             return ret;
2641     }
2642
2643     /*
2644      * This is for Windows RODC that are picky about what name type
2645      * the server principal have, and the really strange part is that
2646      * they are picky about the AS-REQ name type and not the TGS-REQ
2647      * later. Oh well.
2648      */
2649
2650     if (krb5_principal_is_krbtgt(context, principal))
2651         krb5_principal_set_type(context, principal, KRB5_NT_SRV_INST);
2652
2653     krb5_free_principal(context, ctx->cred.server);
2654     ctx->cred.server = principal;
2655
2656     return 0;
2657 }
2658
2659 /**
2660  * Sets the password that will use for the request.
2661  *
2662  * @param context a Kerberos 5 context.
2663  * @param ctx ctx krb5_init_creds_context context.
2664  * @param password the password to use.
2665  *
2666  * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
2667  * @ingroup krb5_credential
2668  */
2669
2670 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2671 krb5_init_creds_set_password(krb5_context context,
2672                              krb5_init_creds_context ctx,
2673                              const char *password)
2674 {
2675     if (ctx->password) {
2676         size_t len;
2677         len = strlen(ctx->password);
2678         memset_s(ctx->password, len, 0, len);
2679         free(ctx->password);
2680     }
2681     if (password) {
2682         ctx->password = strdup(password);
2683         if (ctx->password == NULL)
2684             return krb5_enomem(context);
2685         ctx->keyseed = (void *) ctx->password;
2686     } else {
2687         ctx->keyseed = NULL;
2688         ctx->password = NULL;
2689     }
2690
2691     return 0;
2692 }
2693
2694 static krb5_error_code KRB5_CALLCONV
2695 keytab_key_proc(krb5_context context, krb5_enctype enctype,
2696                 krb5_const_pointer keyseed,
2697                 krb5_salt salt, krb5_data *s2kparms,
2698                 krb5_keyblock **key)
2699 {
2700     krb5_keytab_key_proc_args *args  = rk_UNCONST(keyseed);
2701     krb5_keytab keytab = args->keytab;
2702     krb5_principal principal = args->principal;
2703     krb5_error_code ret;
2704     krb5_keytab real_keytab = NULL;
2705     krb5_keytab_entry entry;
2706
2707     if (keytab == NULL) {
2708         ret = krb5_kt_default(context, &real_keytab);
2709         if (ret)
2710             return ret;
2711         keytab = real_keytab;
2712     }
2713
2714     ret = krb5_kt_get_entry (context, keytab, principal, 0, enctype, &entry);
2715     if (ret == 0) {
2716         ret = krb5_copy_keyblock(context, &entry.keyblock, key);
2717         krb5_kt_free_entry(context, &entry);
2718     }
2719
2720     krb5_kt_close(context, real_keytab);
2721     return ret;
2722 }
2723
2724
2725 /**
2726  * Set the keytab to use for authentication.
2727  *
2728  * @param context a Kerberos 5 context.
2729  * @param ctx ctx krb5_init_creds_context context.
2730  * @param keytab the keytab to read the key from.
2731  *
2732  * @return 0 for success, or an Kerberos 5 error code, see krb5_get_error_message().
2733  * @ingroup krb5_credential
2734  */
2735
2736 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2737 krb5_init_creds_set_keytab(krb5_context context,
2738                            krb5_init_creds_context ctx,
2739                            krb5_keytab keytab)
2740 {
2741     krb5_keytab_key_proc_args *a;
2742     krb5_keytab_entry entry;
2743     krb5_kt_cursor cursor;
2744     krb5_enctype *etypes = NULL;
2745     krb5_error_code ret;
2746     size_t netypes = 0;
2747     int kvno = 0, found = 0;
2748     unsigned n;
2749
2750     a = malloc(sizeof(*a));
2751     if (a == NULL)
2752         return krb5_enomem(context);
2753
2754     a->principal = ctx->cred.client;
2755     a->keytab    = keytab;
2756
2757     ctx->keytab_data = a;
2758     ctx->keyseed = (void *)a;
2759     ctx->keyproc = keytab_key_proc;
2760
2761     /*
2762      * We need to the KDC what enctypes we support for this keytab,
2763      * esp if the keytab is really a password based entry, then the
2764      * KDC might have more enctypes in the database then what we have
2765      * in the keytab.
2766      */
2767
2768     ret = krb5_kt_start_seq_get(context, keytab, &cursor);
2769     if(ret)
2770         goto out;
2771
2772     while(krb5_kt_next_entry(context, keytab, &entry, &cursor) == 0){
2773         void *ptr;
2774
2775         if (!krb5_principal_compare(context, entry.principal, ctx->cred.client))
2776             goto next;
2777
2778         found = 1;
2779
2780         /* check if we ahve this kvno already */
2781         if (entry.vno > kvno) {
2782             /* remove old list of etype */
2783             if (etypes)
2784                 free(etypes);
2785             etypes = NULL;
2786             netypes = 0;
2787             kvno = entry.vno;
2788         } else if (entry.vno != kvno)
2789             goto next;
2790
2791         /* check if enctype is supported */
2792         if (krb5_enctype_valid(context, entry.keyblock.keytype) != 0)
2793             goto next;
2794
2795         /*
2796          * If user already provided a enctype list, use that as an
2797          * additonal filter.
2798          */
2799         if (ctx->etypes) {
2800             for (n = 0; ctx->etypes[n] != KRB5_ENCTYPE_NULL; n++) {
2801                 if (ctx->etypes[n] == entry.keyblock.keytype)
2802                     break;
2803             }
2804             if (ctx->etypes[n] == KRB5_ENCTYPE_NULL)
2805                 goto next;
2806         }
2807
2808         /* add enctype to supported list */
2809         ptr = realloc(etypes, sizeof(etypes[0]) * (netypes + 2));
2810         if (ptr == NULL) {
2811             free(etypes);
2812             ret = krb5_enomem(context);
2813             goto out;
2814         }
2815
2816         etypes = ptr;
2817         etypes[netypes] = entry.keyblock.keytype;
2818         etypes[netypes + 1] = ETYPE_NULL;
2819         netypes++;
2820     next:
2821         krb5_kt_free_entry(context, &entry);
2822     }
2823     krb5_kt_end_seq_get(context, keytab, &cursor);
2824
2825     if (etypes) {
2826         if (ctx->etypes)
2827             free(ctx->etypes);
2828         ctx->etypes = etypes;
2829     }
2830
2831  out:
2832     if (!found) {
2833         if (ret == 0)
2834             ret = KRB5_KT_NOTFOUND;
2835         _krb5_kt_principal_not_found(context, ret, keytab, ctx->cred.client, 0, 0);
2836     }
2837
2838     return ret;
2839 }
2840
2841 static krb5_error_code KRB5_CALLCONV
2842 keyblock_key_proc(krb5_context context, krb5_enctype enctype,
2843                   krb5_const_pointer keyseed,
2844                   krb5_salt salt, krb5_data *s2kparms,
2845                   krb5_keyblock **key)
2846 {
2847     return krb5_copy_keyblock (context, keyseed, key);
2848 }
2849
2850 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2851 krb5_init_creds_set_keyblock(krb5_context context,
2852                              krb5_init_creds_context ctx,
2853                              krb5_keyblock *keyblock)
2854 {
2855     ctx->keyseed = (void *)keyblock;
2856     ctx->keyproc = keyblock_key_proc;
2857
2858     return 0;
2859 }
2860
2861 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2862 krb5_init_creds_set_fast_ccache(krb5_context context,
2863                                 krb5_init_creds_context ctx,
2864                                 krb5_ccache fast_ccache)
2865 {
2866     krb5_creds *cred = NULL;
2867     krb5_error_code ret;
2868     krb5_data data;
2869
2870     ret = _krb5_get_krbtgt(context, fast_ccache, NULL, &cred);
2871     if (ret)
2872         return ret;
2873
2874     ret = krb5_cc_get_config(context, fast_ccache, cred->server,
2875                              "fast_avail", &data);
2876     krb5_free_creds(context, cred);
2877     if (ret == 0) {
2878         ctx->fast_state.armor_ccache = fast_ccache;
2879         ctx->fast_state.flags |= KRB5_FAST_REQUIRED;
2880         ctx->fast_state.flags |= KRB5_FAST_KDC_VERIFIED;
2881     } else {
2882         krb5_set_error_message(context, EINVAL, N_("FAST not available for the KDC in the armor ccache", ""));
2883         return EINVAL;
2884     }
2885     return 0;
2886 }
2887
2888 static krb5_error_code
2889 validate_pkinit_fx(krb5_context context,
2890                    krb5_init_creds_context ctx,
2891                    AS_REP *rep,
2892                    krb5_keyblock *ticket_sessionkey)
2893 {
2894     PA_DATA *pa = NULL;
2895     int idx = 0;
2896
2897     if (rep->padata)
2898         pa = krb5_find_padata(rep->padata->val, rep->padata->len, KRB5_PADATA_PKINIT_KX, &idx);
2899
2900     if (pa == NULL) {
2901         if (ctx->flags.request_anonymous && ctx->pk_init_ctx) {
2902             /* XXX handle the case where pkinit is not used */
2903             krb5_set_error_message(context, KRB5_KDCREP_MODIFIED,
2904                                    N_("Requested anonymous with PKINIT and KDC didn't set PKINIT_KX", ""));
2905             return KRB5_KDCREP_MODIFIED;
2906         }
2907
2908         return 0;
2909     }
2910
2911     heim_assert(ctx->fast_state.reply_key != NULL, "must have a reply key at this stage");
2912
2913     return _krb5_pk_kx_confirm(context,
2914                                ctx->pk_init_ctx,
2915                                ctx->fast_state.reply_key,
2916                                ticket_sessionkey,
2917                                pa);
2918 }
2919
2920 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2921 krb5_init_creds_set_fast_ap_armor_service(krb5_context context,
2922                                           krb5_init_creds_context ctx,
2923                                           krb5_const_principal armor_service)
2924 {
2925     krb5_error_code ret;
2926
2927     if (ctx->fast_state.armor_service)
2928         krb5_free_principal(context, ctx->fast_state.armor_service);
2929     if (armor_service) {
2930         ret = krb5_copy_principal(context, armor_service, &ctx->fast_state.armor_service);
2931         if (ret)
2932             return ret;
2933     } else {
2934         ctx->fast_state.armor_service = NULL;
2935     }
2936     ctx->fast_state.flags |= KRB5_FAST_AP_ARMOR_SERVICE;
2937     return 0;
2938 }
2939
2940 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2941 krb5_init_creds_set_fast_anon_pkinit(krb5_context context,
2942                                      krb5_init_creds_context ctx)
2943 {
2944     if (ctx->fast_state.armor_ccache)
2945         return EINVAL;
2946
2947     ctx->fast_state.flags |= KRB5_FAST_REQUIRED;
2948     ctx->fast_state.flags |= KRB5_FAST_ANON_PKINIT_ARMOR;
2949     return 0;
2950 }
2951
2952 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
2953 _krb5_init_creds_set_fast_anon_pkinit_optimistic(krb5_context context,
2954                                                  krb5_init_creds_context ctx)
2955 {
2956     if (ctx->fast_state.armor_ccache)
2957         return EINVAL;
2958
2959     ctx->fast_state.flags |= KRB5_FAST_REQUIRED;
2960     ctx->fast_state.flags |= KRB5_FAST_ANON_PKINIT_ARMOR;
2961     ctx->fast_state.flags |= KRB5_FAST_OPTIMISTIC;
2962     return 0;
2963 }
2964
2965 static size_t
2966 available_padata_count(METHOD_DATA *md)
2967 {
2968     size_t i, count = 0;
2969
2970     for (i = 0; i < md->len; i++) {
2971         PA_DATA *pa = &md->val[i];
2972
2973         if (pa->padata_type == KRB5_PADATA_FX_COOKIE ||
2974             pa->padata_type == KRB5_PADATA_FX_ERROR)
2975             continue;
2976
2977         count++;
2978     }
2979
2980     return count;
2981 }
2982
2983 static krb5_error_code
2984 init_creds_step(krb5_context context,
2985                 krb5_init_creds_context ctx,
2986                 krb5_data *in,
2987                 krb5_data *out,
2988                 krb5_krbhst_info *hostinfo,
2989                 unsigned int *flags)
2990 {
2991     struct timeval start_time, end_time;
2992     krb5_data checksum_data;
2993     krb5_error_code ret;
2994     size_t len = 0;
2995     size_t size;
2996     AS_REQ req2;
2997
2998     gettimeofday(&start_time, NULL);
2999
3000     krb5_data_zero(out);
3001     krb5_data_zero(&checksum_data);
3002
3003     if (ctx->as_req.req_body.cname == NULL) {
3004         ret = init_as_req(context, ctx->flags, &ctx->cred,
3005                           ctx->addrs, ctx->etypes, &ctx->as_req);
3006         if (ret)
3007             return ret;
3008         if (ctx->fast_state.flags & KRB5_FAST_REQUIRED)
3009             ;
3010         else if (ctx->fast_state.flags & KRB5_FAST_AP_ARMOR_SERVICE)
3011             /* Check with armor service if there is FAST */;
3012         else
3013             ctx->fast_state.flags |= KRB5_FAST_DISABLED;
3014
3015
3016         /* XXX should happen after we get back reply from KDC */
3017         pa_configure(context, ctx, NULL);
3018     }
3019
3020 #define MAX_PA_COUNTER 15
3021     if (ctx->pa_counter > MAX_PA_COUNTER) {
3022         krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
3023                                N_("Looping %d times while getting "
3024                                   "initial credentials", ""),
3025                                ctx->pa_counter);
3026         return KRB5_GET_IN_TKT_LOOP;
3027     }
3028     ctx->pa_counter++;
3029
3030     _krb5_debug(context, 5, "krb5_get_init_creds: loop %d", ctx->pa_counter);
3031
3032     /* Lets process the input packet */
3033     if (in && in->length) {
3034         krb5_kdc_rep rep;
3035
3036         memset(&rep, 0, sizeof(rep));
3037
3038         _krb5_debug(context, 5, "krb5_get_init_creds: processing input");
3039
3040         ret = decode_AS_REP(in->data, in->length, &rep.kdc_rep, &size);
3041         if (ret == 0) {
3042             unsigned eflags = EXTRACT_TICKET_AS_REQ | EXTRACT_TICKET_TIMESYNC;
3043             krb5_data data;
3044
3045             /*
3046              * Unwrap AS-REP
3047              */
3048             ASN1_MALLOC_ENCODE(Ticket, data.data, data.length,
3049                                &rep.kdc_rep.ticket, &size, ret);
3050             if (ret)
3051                 goto out;
3052             heim_assert(data.length == size, "ASN.1 internal error");
3053
3054             ret = _krb5_fast_unwrap_kdc_rep(context, ctx->nonce, &data,
3055                                             &ctx->fast_state, &rep.kdc_rep);
3056             krb5_data_free(&data);
3057             if (ret)
3058                 goto out;
3059
3060             /*
3061              * Now check and extract the ticket
3062              */
3063
3064             if (ctx->flags.canonicalize) {
3065                 eflags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
3066                 eflags |= EXTRACT_TICKET_MATCH_REALM;
3067             }
3068             if (ctx->ic_flags & KRB5_INIT_CREDS_NO_C_CANON_CHECK)
3069                 eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
3070             if (ctx->flags.request_anonymous)
3071                 eflags |= EXTRACT_TICKET_MATCH_ANON;
3072
3073             ret = process_pa_data_to_key(context, ctx, &ctx->cred,
3074                                          &ctx->as_req, &rep.kdc_rep,
3075                                          hostinfo, &ctx->fast_state.reply_key);
3076             if (ret) {
3077                 free_AS_REP(&rep.kdc_rep);
3078                 goto out;
3079             }
3080
3081             if (ctx->fast_state.strengthen_key) {
3082                 krb5_keyblock result;
3083
3084                 _krb5_debug(context, 5, "krb5_get_init_creds: FAST strengthen_key");
3085
3086                 ret = _krb5_fast_cf2(context,
3087                                      ctx->fast_state.strengthen_key,
3088                                      "strengthenkey",
3089                                      ctx->fast_state.reply_key,
3090                                      "replykey",
3091                                      &result,
3092                                      NULL);
3093                 if (ret) {
3094                     free_AS_REP(&rep.kdc_rep);
3095                     goto out;
3096                 }
3097
3098                 ctx->runflags.allow_save_as_reply_key = 1;
3099
3100                 krb5_free_keyblock_contents(context, ctx->fast_state.reply_key);
3101                 *ctx->fast_state.reply_key = result;
3102             }
3103
3104             _krb5_debug(context, 5, "krb5_get_init_creds: extracting ticket");
3105
3106             ret = _krb5_extract_ticket(context,
3107                                        &rep,
3108                                        &ctx->cred,
3109                                        ctx->fast_state.reply_key,
3110                                        NULL,
3111                                        KRB5_KU_AS_REP_ENC_PART,
3112                                        NULL,
3113                                        ctx->nonce,
3114                                        eflags,
3115                                        &ctx->req_buffer,
3116                                        NULL,
3117                                        NULL);
3118
3119             if (ret == 0)
3120                 ret = copy_EncKDCRepPart(&rep.enc_part, &ctx->enc_part);
3121             if (ret == 0)
3122                 ret = validate_pkinit_fx(context, ctx, &rep.kdc_rep, &ctx->cred.session);
3123
3124             ctx->as_enctype = ctx->fast_state.reply_key->keytype;
3125
3126             if (ctx->runflags.allow_save_as_reply_key) {
3127                 ctx->as_reply_key = ctx->fast_state.reply_key;
3128                 ctx->fast_state.reply_key = NULL;
3129             } else {
3130                 krb5_free_keyblock(context, ctx->fast_state.reply_key);
3131                 ctx->fast_state.reply_key = NULL;
3132             }
3133             ctx->ic_flags |= KRB5_INIT_CREDS_DONE;
3134             *flags = 0;
3135
3136             free_AS_REP(&rep.kdc_rep);
3137             free_EncASRepPart(&rep.enc_part);
3138
3139             gettimeofday(&end_time, NULL);
3140             timevalsub(&end_time, &start_time);
3141             timevaladd(&ctx->stats.run_time, &end_time);
3142
3143             _krb5_debug(context, 1, "krb5_get_init_creds: wc: %lld.%06ld",
3144                         (long long)ctx->stats.run_time.tv_sec,
3145                         (long)ctx->stats.run_time.tv_usec);
3146             return ret;
3147
3148         } else {
3149             /* let's try to parse it as a KRB-ERROR */
3150
3151             _krb5_debug(context, 5, "krb5_get_init_creds: got an KRB-ERROR from KDC");
3152
3153             free_KRB_ERROR(&ctx->error);
3154
3155             ret = krb5_rd_error(context, in, &ctx->error);
3156             if(ret && in->length && ((char*)in->data)[0] == 4)
3157                 ret = KRB5KRB_AP_ERR_V4_REPLY;
3158             if (ret) {
3159                 _krb5_debug(context, 5, "krb5_get_init_creds: failed to read error");
3160                 goto out;
3161             }
3162
3163             /*
3164              * Unwrap method-data, if there is any,
3165              * fast_unwrap_error() below might replace it with a
3166              * wrapped version if we are using FAST.
3167              */
3168
3169             free_METHOD_DATA(&ctx->md);
3170             memset(&ctx->md, 0, sizeof(ctx->md));
3171
3172             if (ctx->error.e_data) {
3173                 krb5_error_code ret2;
3174
3175                 ret2 = decode_METHOD_DATA(ctx->error.e_data->data,
3176                                          ctx->error.e_data->length,
3177                                          &ctx->md,
3178                                          NULL);
3179                 if (ret2) {
3180                     /*
3181                      * Just ignore any error, the error will be pushed
3182                      * out from krb5_error_from_rd_error() if there
3183                      * was one.
3184                      */
3185                     _krb5_debug(context, 5, N_("Failed to decode METHOD-DATA", ""));
3186                 }
3187             }
3188
3189             /*
3190              * Unwrap KRB-ERROR, we are always calling this so that
3191              * FAST can tell us if your peer KDC suddenly dropped FAST
3192              * wrapping and its really an attacker's packet (or a bug
3193              * in the KDC).
3194              */
3195             ret = _krb5_fast_unwrap_error(context, ctx->nonce, &ctx->fast_state,
3196                                           &ctx->md, &ctx->error);
3197             if (ret)
3198                 goto out;
3199
3200             /*
3201              *
3202              */
3203
3204             ret = krb5_error_from_rd_error(context, &ctx->error, &ctx->cred);
3205
3206             /* log the failure */
3207             if (_krb5_have_debug(context, 5)) {
3208                 const char *str = krb5_get_error_message(context, ret);
3209                 _krb5_debug(context, 5, "krb5_get_init_creds: KRB-ERROR %d/%s", ret, str);
3210                 krb5_free_error_message(context, str);
3211             }
3212
3213             /*
3214              * Handle special error codes
3215              */
3216
3217             if (ret == KRB5KDC_ERR_PREAUTH_REQUIRED
3218                 || ret == KRB5_KDC_ERR_MORE_PREAUTH_DATA_REQUIRED
3219                 || ret == KRB5KDC_ERR_ETYPE_NOSUPP)
3220             {
3221                 /*
3222                  * If no preauth was set and KDC requires it, give it one
3223                  * more try.
3224                  *
3225                  * If the KDC returned KRB5KDC_ERR_ETYPE_NOSUPP, just loop
3226                  * one more time since that might mean we are dealing with
3227                  * a Windows KDC that is confused about what enctypes are
3228                  * available.
3229                  */
3230
3231                 if (available_padata_count(&ctx->md) == 0) {
3232                     krb5_set_error_message(context, ret,
3233                                            N_("Preauth required but no preauth "
3234                                               "options send by KDC", ""));
3235                     goto out;
3236                 }
3237             } else if (ret == KRB5KRB_AP_ERR_SKEW && context->kdc_sec_offset == 0) {
3238                 /*
3239                  * Try adapt to timeskrew when we are using pre-auth, and
3240                  * if there was a time skew, try again.
3241                  */
3242                 krb5_set_real_time(context, ctx->error.stime, -1);
3243                 if (context->kdc_sec_offset)
3244                     ret = 0;
3245
3246                 _krb5_debug(context, 10, "init_creds: err skew updating kdc offset to %d",
3247                             context->kdc_sec_offset);
3248                 if (ret)
3249                     goto out;
3250
3251                 pa_restart(context, ctx);
3252
3253             } else if (ret == KRB5_KDC_ERR_WRONG_REALM && ctx->flags.canonicalize) {
3254                 /* client referral to a new realm */
3255                 char *ref_realm;
3256
3257                 if (ctx->error.crealm == NULL) {
3258                     krb5_set_error_message(context, ret,
3259                                            N_("Got a client referral, not but no realm", ""));
3260                     goto out;
3261                 }
3262                 ref_realm = *ctx->error.crealm;
3263
3264                 _krb5_debug(context, 5, "krb5_get_init_creds: referral to realm %s",
3265                             ref_realm);
3266
3267                 /*
3268                  * If its a krbtgt, lets updat the requested krbtgt too
3269                  */
3270                 if (krb5_principal_is_krbtgt(context, ctx->cred.server)) {
3271
3272                     free(ctx->cred.server->name.name_string.val[1]);
3273                     ctx->cred.server->name.name_string.val[1] = strdup(ref_realm);
3274                     if (ctx->cred.server->name.name_string.val[1] == NULL) {
3275                         ret = krb5_enomem(context);
3276                         goto out;
3277                     }
3278
3279                     free_PrincipalName(ctx->as_req.req_body.sname);
3280                     ret = _krb5_principal2principalname(ctx->as_req.req_body.sname, ctx->cred.server);
3281                     if (ret)
3282                         goto out;
3283                 }
3284
3285                 free(ctx->as_req.req_body.realm);
3286                 ret = copy_Realm(&ref_realm, &ctx->as_req.req_body.realm);
3287                 if (ret)
3288                     goto out;
3289
3290                 ret = krb5_principal_set_realm(context,
3291                                                ctx->cred.client,
3292                                                *ctx->error.crealm);
3293                 if (ret)
3294                     goto out;
3295
3296                 ret = krb5_unparse_name(context, ctx->cred.client, &ref_realm);
3297                 if (ret == 0) {
3298                     _krb5_debug(context, 5, "krb5_get_init_creds: got referral to %s", ref_realm);
3299                     krb5_xfree(ref_realm);
3300                 }
3301
3302                 pa_restart(context, ctx);
3303
3304             } else if (ret == KRB5KDC_ERR_KEY_EXP && ctx->runflags.change_password == 0 &&
3305                        ctx->runflags.change_password_prompt) {
3306                 char buf2[1024];
3307
3308                 ctx->runflags.change_password = 1;
3309
3310                 ctx->prompter(context, ctx->prompter_data, NULL, N_("Password has expired", ""), 0, NULL);
3311
3312                 /* try to avoid recursion */
3313                 if (ctx->in_tkt_service != NULL && strcmp(ctx->in_tkt_service, "kadmin/changepw") == 0)
3314                     goto out;
3315
3316                 /* don't include prompter in runtime */
3317                 gettimeofday(&end_time, NULL);
3318                 timevalsub(&end_time, &start_time);
3319                 timevaladd(&ctx->stats.run_time, &end_time);
3320
3321                 ret = change_password(context,
3322                                       ctx->cred.client,
3323                                       ctx->password,
3324                                       buf2,
3325                                       sizeof(buf2),
3326                                       ctx->prompter,
3327                                       ctx->prompter_data,
3328                                       NULL);
3329                 if (ret)
3330                     goto out;
3331
3332                 gettimeofday(&start_time, NULL);
3333
3334                 krb5_init_creds_set_password(context, ctx, buf2);
3335
3336                 pa_restart(context, ctx);
3337
3338             } else if (ret == KRB5KDC_ERR_PREAUTH_FAILED) {
3339
3340                 /*
3341                  * Old MIT KDC can't handle KRB5_PADATA_REQ_ENC_PA_REP,
3342                  * so drop it and try again. But only try that for MIT
3343                  * Kerberos servers by keying of no METHOD-DATA.
3344                  */
3345                 if (ctx->runflags.allow_enc_pa_rep) {
3346                     if (ctx->md.len != 0) {
3347                         _krb5_debug(context, 10, "Server sent PA data with KRB-ERROR, "
3348                                     "so not a pre 1.7 MIT KDC and won't retry w/o ENC-PA-REQ");
3349                         goto out;
3350                     }
3351                     _krb5_debug(context, 10, "Disabling allow_enc_pa_rep and trying again");
3352                     ctx->runflags.allow_enc_pa_rep = 0;
3353                     goto retry;
3354                 }
3355
3356                 if (ctx->fast_state.flags & KRB5_FAST_DISABLED) {
3357                     _krb5_debug(context, 10, "FAST disabled and got preauth failed");
3358                     goto out;
3359                 }
3360
3361             retry:
3362                 pa_restart(context, ctx);
3363
3364             } else if (ctx->fast_state.flags & KRB5_FAST_OPTIMISTIC) {
3365                 _krb5_debug(context, 10,
3366                             "Some other error %d failed with optimistic FAST, trying w/o FAST", ret);
3367
3368                 ctx->fast_state.flags &= ~KRB5_FAST_OPTIMISTIC;
3369                 ctx->fast_state.flags &= ~KRB5_FAST_REQUIRED;
3370                 ctx->fast_state.flags &= ~KRB5_FAST_ANON_PKINIT_ARMOR;
3371                 ctx->fast_state.flags |= KRB5_FAST_DISABLED;
3372                 pa_restart(context, ctx);
3373             } else {
3374                 /* some other error code from the KDC, lets' return it to the user */
3375                 goto out;
3376             }
3377         }
3378     }
3379
3380     if (ctx->as_req.padata) {
3381         free_METHOD_DATA(ctx->as_req.padata);
3382         free(ctx->as_req.padata);
3383         ctx->as_req.padata = NULL;
3384     }
3385
3386     ret = _krb5_fast_create_armor(context, &ctx->fast_state,
3387                                   ctx->cred.client->realm);
3388     if (ret)
3389         goto out;
3390
3391     /* Set a new nonce. */
3392     ctx->as_req.req_body.nonce = ctx->nonce;
3393
3394
3395     /*
3396      * Step and announce PA-DATA
3397      */
3398
3399     ret = process_pa_data_to_md(context, &ctx->cred, &ctx->as_req, ctx,
3400                                 &ctx->md, &ctx->as_req.padata);
3401     if (ret)
3402         goto out;
3403
3404
3405     /*
3406      * Wrap with FAST
3407      */
3408     ret = copy_AS_REQ(&ctx->as_req, &req2);
3409     if (ret)
3410         goto out;
3411
3412     ret = _krb5_fast_wrap_req(context,
3413                               &ctx->fast_state,
3414                               NULL,
3415                               &req2);
3416
3417     krb5_data_free(&checksum_data);
3418     if (ret) {
3419         free_AS_REQ(&req2);
3420         goto out;
3421     }
3422
3423     krb5_data_free(&ctx->req_buffer);
3424
3425     ASN1_MALLOC_ENCODE(AS_REQ,
3426                        ctx->req_buffer.data, ctx->req_buffer.length,
3427                        &req2, &len, ret);
3428     free_AS_REQ(&req2);
3429     if (ret)
3430         goto out;
3431     if(len != ctx->req_buffer.length)
3432         krb5_abortx(context, "internal error in ASN.1 encoder");
3433
3434     out->data = ctx->req_buffer.data;
3435     out->length = ctx->req_buffer.length;
3436
3437     *flags = KRB5_INIT_CREDS_STEP_FLAG_CONTINUE;
3438
3439     gettimeofday(&end_time, NULL);
3440     timevalsub(&end_time, &start_time);
3441     timevaladd(&ctx->stats.run_time, &end_time);
3442
3443     return 0;
3444  out:
3445     return ret;
3446 }
3447
3448 /**
3449  * The core loop if krb5_get_init_creds() function family. Create the
3450  * packets and have the caller send them off to the KDC.
3451  *
3452  * If the caller want all work been done for them, use
3453  * krb5_init_creds_get() instead.
3454  *
3455  * @param context a Kerberos 5 context.
3456  * @param ctx ctx krb5_init_creds_context context.
3457  * @param in input data from KDC, first round it should be reset by krb5_data_zer().
3458  * @param out reply to KDC.
3459  * @param hostinfo KDC address info, first round it can be NULL.
3460  * @param flags status of the round, if
3461  *        KRB5_INIT_CREDS_STEP_FLAG_CONTINUE is set, continue one more round.
3462  *
3463  * @return 0 for success, or an Kerberos 5 error code, see
3464  *     krb5_get_error_message().
3465  *
3466  * @ingroup krb5_credential
3467  */
3468
3469 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3470 krb5_init_creds_step(krb5_context context,
3471                      krb5_init_creds_context ctx,
3472                      krb5_data *in,
3473                      krb5_data *out,
3474                      krb5_krbhst_info *hostinfo,
3475                      unsigned int *flags)
3476 {
3477     krb5_error_code ret;
3478     krb5_data empty;
3479
3480     krb5_data_zero(&empty);
3481
3482     if ((ctx->fast_state.flags & KRB5_FAST_ANON_PKINIT_ARMOR) &&
3483         ctx->fast_state.armor_ccache == NULL) {
3484         ret = _krb5_fast_anon_pkinit_step(context, ctx, &ctx->fast_state,
3485                                           in, out, hostinfo, flags);
3486         if (ret && (ctx->fast_state.flags & KRB5_FAST_OPTIMISTIC)) {
3487             _krb5_debug(context, 5, "Preauth failed with optimistic "
3488                         "FAST, trying w/o FAST");
3489             ctx->fast_state.flags &= ~KRB5_FAST_OPTIMISTIC;
3490             ctx->fast_state.flags &= ~KRB5_FAST_REQUIRED;
3491             ctx->fast_state.flags &= ~KRB5_FAST_ANON_PKINIT_ARMOR;
3492         } else if (ret ||
3493                    ((*flags & KRB5_INIT_CREDS_STEP_FLAG_CONTINUE) == 0) ||
3494                    out->length)
3495             return ret;
3496
3497         in = &empty;
3498     }
3499
3500     return init_creds_step(context, ctx, in, out, hostinfo, flags);
3501 }
3502
3503 /**
3504  * Extract the newly acquired credentials from krb5_init_creds_context
3505  * context.
3506  *
3507  * @param context A Kerberos 5 context.
3508  * @param ctx
3509  * @param cred credentials, free with krb5_free_cred_contents().
3510  *
3511  * @return 0 for sucess or An Kerberos error code, see krb5_get_error_message().
3512  */
3513
3514 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3515 krb5_init_creds_get_creds(krb5_context context,
3516                           krb5_init_creds_context ctx,
3517                           krb5_creds *cred)
3518 {
3519     return krb5_copy_creds_contents(context, &ctx->cred, cred);
3520 }
3521
3522 /**
3523  * Extract the as-reply key from the context.
3524  *
3525  * Only allowed when the as-reply-key is not directly derived from the
3526  * password like PK-INIT, GSS, FAST hardened key, etc.
3527  *
3528  * @param context A Kerberos 5 context.
3529  * @param ctx ctx krb5_init_creds_context context.
3530  * @param as_reply_key keyblock, free with krb5_free_keyblock_contents().
3531  *
3532  * @return 0 for sucess or An Kerberos error code, see krb5_get_error_message().
3533  */
3534
3535 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3536 krb5_init_creds_get_as_reply_key(krb5_context context,
3537                                  krb5_init_creds_context ctx,
3538                                  krb5_keyblock *as_reply_key)
3539 {
3540     if (ctx->as_reply_key == NULL)
3541         return KRB5KDC_ERR_PREAUTH_REQUIRED;
3542     return krb5_copy_keyblock_contents(context, ctx->as_reply_key, as_reply_key);
3543 }
3544
3545 KRB5_LIB_FUNCTION krb5_timestamp KRB5_LIB_CALL
3546 _krb5_init_creds_get_cred_starttime(krb5_context context, krb5_init_creds_context ctx)
3547 {
3548     return ctx->cred.times.starttime;
3549 }
3550
3551 KRB5_LIB_FUNCTION krb5_timestamp KRB5_LIB_CALL
3552 _krb5_init_creds_get_cred_endtime(krb5_context context, krb5_init_creds_context ctx)
3553 {
3554     return ctx->cred.times.endtime;
3555 }
3556
3557 KRB5_LIB_FUNCTION krb5_principal KRB5_LIB_CALL
3558 _krb5_init_creds_get_cred_client(krb5_context context, krb5_init_creds_context ctx)
3559 {
3560     return ctx->cred.client;
3561 }
3562
3563 /**
3564  * Get the last error from the transaction.
3565  *
3566  * @return Returns 0 or an error code
3567  *
3568  * @ingroup krb5_credential
3569  */
3570
3571 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3572 krb5_init_creds_get_error(krb5_context context,
3573                           krb5_init_creds_context ctx,
3574                           KRB_ERROR *error)
3575 {
3576     krb5_error_code ret;
3577
3578     ret = copy_KRB_ERROR(&ctx->error, error);
3579     if (ret)
3580         krb5_enomem(context);
3581
3582     return ret;
3583 }
3584
3585 /**
3586  * Store config
3587  *
3588  * @param context A Kerberos 5 context.
3589  * @param ctx The krb5_init_creds_context to free.
3590  * @param id store
3591  *
3592  * @return Returns 0 or an error code
3593  *
3594  * @ingroup krb5_credential
3595  */
3596
3597 krb5_error_code KRB5_LIB_FUNCTION
3598 krb5_init_creds_store_config(krb5_context context,
3599                              krb5_init_creds_context ctx,
3600                              krb5_ccache id)
3601 {
3602     krb5_error_code ret;
3603
3604     if (ctx->kdc_hostname) {
3605         krb5_data data;
3606         data.length = strlen(ctx->kdc_hostname);
3607         data.data = ctx->kdc_hostname;
3608
3609         ret = krb5_cc_set_config(context, id, NULL, "lkdc-hostname", &data);
3610         if (ret)
3611             return ret;
3612     }
3613     if (ctx->sitename) {
3614         krb5_data data;
3615         data.length = strlen(ctx->sitename);
3616         data.data = ctx->sitename;
3617
3618         ret = krb5_cc_set_config(context, id, NULL, "sitename", &data);
3619         if (ret)
3620             return ret;
3621     }
3622
3623     return 0;
3624 }
3625
3626 /**
3627  *
3628  * @ingroup krb5_credential
3629  */
3630
3631 krb5_error_code
3632 krb5_init_creds_store(krb5_context context,
3633                       krb5_init_creds_context ctx,
3634                       krb5_ccache id)
3635 {
3636     krb5_error_code ret;
3637
3638     if (ctx->cred.client == NULL) {
3639         ret = KRB5KDC_ERR_PREAUTH_REQUIRED;
3640         krb5_set_error_message(context, ret, "init creds not completed yet");
3641         return ret;
3642     }
3643
3644     ret = krb5_cc_initialize(context, id, ctx->cred.client);
3645     if (ret)
3646         return ret;
3647
3648     ret = krb5_cc_store_cred(context, id, &ctx->cred);
3649     if (ret)
3650         return ret;
3651
3652     if (ctx->cred.flags.b.enc_pa_rep) {
3653         krb5_data data = { 3, rk_UNCONST("yes") };
3654         ret = krb5_cc_set_config(context, id, ctx->cred.server,
3655                                  "fast_avail", &data);
3656         if (ret)
3657             return ret;
3658     }
3659
3660     return 0;
3661 }
3662
3663 /**
3664  * Free the krb5_init_creds_context allocated by krb5_init_creds_init().
3665  *
3666  * @param context A Kerberos 5 context.
3667  * @param ctx The krb5_init_creds_context to free.
3668  *
3669  * @ingroup krb5_credential
3670  */
3671
3672 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
3673 krb5_init_creds_free(krb5_context context,
3674                      krb5_init_creds_context ctx)
3675 {
3676     free_init_creds_ctx(context, ctx);
3677     free(ctx);
3678 }
3679
3680 /**
3681  * Get new credentials as setup by the krb5_init_creds_context.
3682  *
3683  * @param context A Kerberos 5 context.
3684  * @param ctx The krb5_init_creds_context to process.
3685  *
3686  * @ingroup krb5_credential
3687  */
3688
3689 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3690 krb5_init_creds_get(krb5_context context, krb5_init_creds_context ctx)
3691 {
3692     krb5_sendto_ctx stctx = NULL;
3693     krb5_krbhst_info *hostinfo = NULL;
3694     krb5_error_code ret;
3695     krb5_data in, out;
3696     unsigned int flags = 0;
3697
3698     krb5_data_zero(&in);
3699     krb5_data_zero(&out);
3700
3701     ret = krb5_sendto_ctx_alloc(context, &stctx);
3702     if (ret)
3703         goto out;
3704     krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
3705
3706     if (ctx->kdc_hostname)
3707         krb5_sendto_set_hostname(context, stctx, ctx->kdc_hostname);
3708     if (ctx->sitename)
3709         krb5_sendto_set_sitename(context, stctx, ctx->sitename);
3710
3711     while (1) {
3712         struct timeval nstart, nend;
3713
3714         flags = 0;
3715         ret = krb5_init_creds_step(context, ctx, &in, &out, hostinfo, &flags);
3716         krb5_data_free(&in);
3717         if (ret)
3718             goto out;
3719
3720         if ((flags & KRB5_INIT_CREDS_STEP_FLAG_CONTINUE) == 0)
3721             break;
3722
3723         gettimeofday(&nstart, NULL);
3724
3725         ret = krb5_sendto_context (context, stctx, &out,
3726                                    ctx->cred.client->realm, &in);
3727         if (ret)
3728             goto out;
3729
3730         gettimeofday(&nend, NULL);
3731         timevalsub(&nend, &nstart);
3732         timevaladd(&ctx->stats.run_time, &nend);
3733     }
3734
3735  out:
3736     if (stctx)
3737         krb5_sendto_ctx_free(context, stctx);
3738
3739     return ret;
3740 }
3741
3742 /**
3743  * Get new credentials using password.
3744  *
3745  * @ingroup krb5_credential
3746  */
3747
3748
3749 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3750 krb5_get_init_creds_password(krb5_context context,
3751                              krb5_creds *creds,
3752                              krb5_principal client,
3753                              const char *password,
3754                              krb5_prompter_fct prompter,
3755                              void *data,
3756                              krb5_deltat start_time,
3757                              const char *in_tkt_service,
3758                              krb5_get_init_creds_opt *options)
3759 {
3760     krb5_init_creds_context ctx;
3761     char buf[BUFSIZ], buf2[BUFSIZ];
3762     krb5_error_code ret;
3763     int chpw = 0;
3764
3765  again:
3766     ret = krb5_init_creds_init(context, client, prompter, data, start_time, options, &ctx);
3767     if (ret)
3768         goto out;
3769
3770     ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
3771     if (ret)
3772         goto out;
3773
3774     if (prompter != NULL && ctx->password == NULL && password == NULL) {
3775         krb5_prompt prompt;
3776         krb5_data password_data;
3777         char *p, *q = NULL;
3778         int aret;
3779
3780         ret = krb5_unparse_name(context, client, &p);
3781         if (ret)
3782             goto out;
3783
3784         aret = asprintf(&q, "%s's Password: ", p);
3785         free (p);
3786         if (aret == -1 || q == NULL) {
3787             ret = krb5_enomem(context);
3788             goto out;
3789         }
3790         prompt.prompt = q;
3791         password_data.data   = buf;
3792         password_data.length = sizeof(buf);
3793         prompt.hidden = 1;
3794         prompt.reply  = &password_data;
3795         prompt.type   = KRB5_PROMPT_TYPE_PASSWORD;
3796
3797         ret = (*prompter) (context, data, NULL, NULL, 1, &prompt);
3798         free (q);
3799         if (ret) {
3800             memset_s(buf, sizeof(buf), 0, sizeof(buf));
3801             ret = KRB5_LIBOS_PWDINTR;
3802             krb5_clear_error_message (context);
3803             goto out;
3804         }
3805         password = password_data.data;
3806     }
3807
3808     if (password) {
3809         ret = krb5_init_creds_set_password(context, ctx, password);
3810         if (ret)
3811             goto out;
3812     }
3813
3814     ret = krb5_init_creds_get(context, ctx);
3815
3816     if (ret == 0)
3817         krb5_process_last_request(context, options, ctx);
3818
3819
3820     if (ret == KRB5KDC_ERR_KEY_EXPIRED && chpw == 0) {
3821         /* try to avoid recursion */
3822         if (in_tkt_service != NULL && strcmp(in_tkt_service, "kadmin/changepw") == 0)
3823            goto out;
3824
3825         /* don't try to change password if no prompter or prompting disabled */
3826         if (!ctx->runflags.change_password_prompt)
3827             goto out;
3828
3829         ret = change_password (context,
3830                                client,
3831                                ctx->password,
3832                                buf2,
3833                                sizeof(buf2),
3834                                prompter,
3835                                data,
3836                                options);
3837         if (ret)
3838             goto out;
3839         password = buf2;
3840         chpw = 1;
3841         krb5_init_creds_free(context, ctx);
3842         goto again;
3843     }
3844
3845  out:
3846     if (ret == 0)
3847         krb5_init_creds_get_creds(context, ctx, creds);
3848
3849     if (ctx)
3850         krb5_init_creds_free(context, ctx);
3851
3852     memset_s(buf, sizeof(buf), 0, sizeof(buf));
3853     memset_s(buf2, sizeof(buf), 0, sizeof(buf2));
3854     return ret;
3855 }
3856
3857 /**
3858  * Get new credentials using keyblock.
3859  *
3860  * @ingroup krb5_credential
3861  */
3862
3863 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3864 krb5_get_init_creds_keyblock(krb5_context context,
3865                              krb5_creds *creds,
3866                              krb5_principal client,
3867                              krb5_keyblock *keyblock,
3868                              krb5_deltat start_time,
3869                              const char *in_tkt_service,
3870                              krb5_get_init_creds_opt *options)
3871 {
3872     krb5_init_creds_context ctx;
3873     krb5_error_code ret;
3874
3875     memset(creds, 0, sizeof(*creds));
3876
3877     ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
3878     if (ret)
3879         goto out;
3880
3881     ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
3882     if (ret)
3883         goto out;
3884
3885     ret = krb5_init_creds_set_keyblock(context, ctx, keyblock);
3886     if (ret)
3887         goto out;
3888
3889     ret = krb5_init_creds_get(context, ctx);
3890
3891     if (ret == 0)
3892         krb5_process_last_request(context, options, ctx);
3893
3894  out:
3895     if (ret == 0)
3896         krb5_init_creds_get_creds(context, ctx, creds);
3897
3898     if (ctx)
3899         krb5_init_creds_free(context, ctx);
3900
3901     return ret;
3902 }
3903
3904 /**
3905  * Get new credentials using keytab.
3906  *
3907  * @ingroup krb5_credential
3908  */
3909
3910 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3911 krb5_get_init_creds_keytab(krb5_context context,
3912                            krb5_creds *creds,
3913                            krb5_principal client,
3914                            krb5_keytab keytab,
3915                            krb5_deltat start_time,
3916                            const char *in_tkt_service,
3917                            krb5_get_init_creds_opt *options)
3918 {
3919     krb5_init_creds_context ctx;
3920     krb5_keytab_entry ktent;
3921     krb5_error_code ret;
3922
3923     memset(&ktent, 0, sizeof(ktent));
3924     memset(creds, 0, sizeof(*creds));
3925
3926     if (strcmp(client->realm, "") == 0) {
3927         /*
3928          * Referral realm.  We have a keytab, so pick a realm by
3929          * matching in the keytab.
3930          */
3931         ret = krb5_kt_get_entry(context, keytab, client, 0, 0, &ktent);
3932         if (ret == 0)
3933             client = ktent.principal;
3934     }
3935
3936     ret = krb5_init_creds_init(context, client, NULL, NULL, start_time, options, &ctx);
3937     if (ret)
3938         goto out;
3939
3940     ret = krb5_init_creds_set_service(context, ctx, in_tkt_service);
3941     if (ret)
3942         goto out;
3943
3944     ret = krb5_init_creds_set_keytab(context, ctx, keytab);
3945     if (ret)
3946         goto out;
3947
3948     ret = krb5_init_creds_get(context, ctx);
3949     if (ret == 0)
3950         krb5_process_last_request(context, options, ctx);
3951
3952  out:
3953     krb5_kt_free_entry(context, &ktent);
3954     if (ret == 0)
3955         krb5_init_creds_get_creds(context, ctx, creds);
3956
3957     if (ctx)
3958         krb5_init_creds_free(context, ctx);
3959
3960     return ret;
3961 }
3962
3963 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
3964 _krb5_init_creds_set_gss_mechanism(krb5_context context,
3965                                    krb5_gss_init_ctx gssic,
3966                                    const struct gss_OID_desc_struct *gss_mech)
3967 {
3968     gssic->mech = gss_mech; /* OIDs are interned, so no copy required */
3969 }
3970
3971 KRB5_LIB_FUNCTION const struct gss_OID_desc_struct * KRB5_LIB_CALL
3972 _krb5_init_creds_get_gss_mechanism(krb5_context context,
3973                                    krb5_gss_init_ctx gssic)
3974 {
3975     return gssic->mech;
3976 }
3977
3978 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
3979 _krb5_init_creds_set_gss_cred(krb5_context context,
3980                               krb5_gss_init_ctx gssic,
3981                               struct gss_cred_id_t_desc_struct *gss_cred)
3982 {
3983     if (gssic->cred != gss_cred && gssic->flags.release_cred)
3984         gssic->release_cred(context, gssic, gssic->cred);
3985
3986     gssic->cred = gss_cred;
3987     gssic->flags.release_cred = 1;
3988 }
3989
3990 KRB5_LIB_FUNCTION const struct gss_cred_id_t_desc_struct * KRB5_LIB_CALL
3991 _krb5_init_creds_get_gss_cred(krb5_context context,
3992                               krb5_gss_init_ctx gssic)
3993 {
3994     return gssic->cred;
3995 }
3996
3997 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
3998 _krb5_init_creds_init_gss(krb5_context context,
3999                           krb5_init_creds_context ctx,
4000                           krb5_gssic_step step,
4001                           krb5_gssic_finish finish,
4002                           krb5_gssic_release_cred release_cred,
4003                           krb5_gssic_delete_sec_context delete_sec_context,
4004                           const struct gss_cred_id_t_desc_struct *gss_cred,
4005                           const struct gss_OID_desc_struct *gss_mech,
4006                           unsigned int flags)
4007 {
4008     krb5_gss_init_ctx gssic;
4009
4010     gssic = calloc(1, sizeof(*gssic));
4011     if (gssic == NULL)
4012         return krb5_enomem(context);
4013
4014     if (ctx->gss_init_ctx)
4015         free_gss_init_ctx(context, ctx->gss_init_ctx);
4016     ctx->gss_init_ctx = gssic;
4017
4018     gssic->cred = (struct gss_cred_id_t_desc_struct *)gss_cred;
4019     gssic->mech = gss_mech;
4020     if (flags & KRB5_GSS_IC_FLAG_RELEASE_CRED)
4021         gssic->flags.release_cred = 1;
4022
4023     gssic->step = step;
4024     gssic->finish = finish;
4025     gssic->release_cred = release_cred;
4026     gssic->delete_sec_context = delete_sec_context;
4027
4028     return 0;
4029 }