kdc/kerberos5.c

   1 /*
   2  * Copyright (c) 1997-2007 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "kdc_locl.h"
  35
  36 #define MAX_TIME ((time_t)((1U << 31) - 1))
  37
  38 void
  39 _kdc_fix_time(time_t **t)
  40 {
  41     if(*t == NULL){
  42         ALLOC(*t);
  43         **t = MAX_TIME;
  44     }
  45     if(**t == 0) **t = MAX_TIME; /* fix for old clients */
  46 }
  47
  48 static int
  49 realloc_method_data(METHOD_DATA *md)
  50 {
  51     PA_DATA *pa;
  52     pa = realloc(md->val, (md->len + 1) * sizeof(*md->val));
  53     if(pa == NULL)
  54         return ENOMEM;
  55     md->val = pa;
  56     md->len++;
  57     return 0;
  58 }
  59
  60 static void
  61 set_salt_padata(METHOD_DATA *md, Salt *salt)
  62 {
  63     if (salt) {
  64        realloc_method_data(md);
  65        md->val[md->len - 1].padata_type = salt->type;
  66        der_copy_octet_string(&salt->salt,
  67                              &md->val[md->len - 1].padata_value);
  68     }
  69 }
  70
  71 const PA_DATA*
  72 _kdc_find_padata(const KDC_REQ *req, int *start, int type)
  73 {
  74     if (req->padata == NULL)
  75         return NULL;
  76
  77     while(*start < req->padata->len){
  78         (*start)++;
  79         if(req->padata->val[*start - 1].padata_type == type)
  80             return &req->padata->val[*start - 1];
  81     }
  82     return NULL;
  83 }
  84
  85 /*
  86  * This is a hack to allow predefined weak services, like afs to
  87  * still use weak types
  88  */
  89
  90 krb5_boolean
  91 _kdc_is_weak_exception(krb5_principal principal, krb5_enctype etype)
  92 {
  93     if (principal->name.name_string.len > 0 &&
  94         strcmp(principal->name.name_string.val[0], "afs") == 0 &&
  95         (etype == ETYPE_DES_CBC_CRC
  96          || etype == ETYPE_DES_CBC_MD4
  97          || etype == ETYPE_DES_CBC_MD5))
  98         return TRUE;
  99     return FALSE;
 100 }
 101
 102
 103 /*
 104  * Detect if `key' is the using the the precomputed `default_salt'.
 105  */
 106
 107 static krb5_boolean
 108 is_default_salt_p(const krb5_salt *default_salt, const Key *key)
 109 {
 110     if (key->salt == NULL)
 111         return TRUE;
 112     if (default_salt->salttype != key->salt->type)
 113         return FALSE;
 114     if (krb5_data_cmp(&default_salt->saltvalue, &key->salt->salt))
 115         return FALSE;
 116     return TRUE;
 117 }
 118
 119 /*
 120  * return the first appropriate key of `princ' in `ret_key'.  Look for
 121  * all the etypes in (`etypes', `len'), stopping as soon as we find
 122  * one, but preferring one that has default salt
 123  */
 124
 125 krb5_error_code
 126 _kdc_find_etype(krb5_context context, const hdb_entry_ex *princ,
 127                 krb5_enctype *etypes, unsigned len,
 128                 Key **ret_key)
 129 {
 130     int i;
 131     krb5_error_code ret = KRB5KDC_ERR_ETYPE_NOSUPP;
 132     krb5_salt def_salt;
 133
 134     krb5_get_pw_salt (context, princ->entry.principal, &def_salt);
 135
 136     for(i = 0; ret != 0 && i < len ; i++) {
 137         Key *key = NULL;
 138
 139         if (krb5_enctype_valid(context, etypes[i]) != 0 &&
 140             !_kdc_is_weak_exception(princ->entry.principal, etypes[i]))
 141             continue;
 142
 143         while (hdb_next_enctype2key(context, &princ->entry, etypes[i], &key) == 0) {
 144             if (key->key.keyvalue.length == 0) {
 145                 ret = KRB5KDC_ERR_NULL_KEY;
 146                 continue;
 147             }
 148             *ret_key   = key;
 149             ret = 0;
 150             if (is_default_salt_p(&def_salt, key)) {
 151                 krb5_free_salt (context, def_salt);
 152                 return ret;
 153             }
 154         }
 155     }
 156     krb5_free_salt (context, def_salt);
 157     return ret;
 158 }
 159
 160 krb5_error_code
 161 _kdc_make_anonymous_principalname (PrincipalName *pn)
 162 {
 163     pn->name_type = KRB5_NT_PRINCIPAL;
 164     pn->name_string.len = 1;
 165     pn->name_string.val = malloc(sizeof(*pn->name_string.val));
 166     if (pn->name_string.val == NULL)
 167         return ENOMEM;
 168     pn->name_string.val[0] = strdup("anonymous");
 169     if (pn->name_string.val[0] == NULL) {
 170         free(pn->name_string.val);
 171         pn->name_string.val = NULL;
 172         return ENOMEM;
 173     }
 174     return 0;
 175 }
 176
 177 void
 178 _kdc_log_timestamp(krb5_context context,
 179                    krb5_kdc_configuration *config,
 180                    const char *type,
 181                    KerberosTime authtime, KerberosTime *starttime,
 182                    KerberosTime endtime, KerberosTime *renew_till)
 183 {
 184     char authtime_str[100], starttime_str[100],
 185         endtime_str[100], renewtime_str[100];
 186
 187     krb5_format_time(context, authtime,
 188                      authtime_str, sizeof(authtime_str), TRUE);
 189     if (starttime)
 190         krb5_format_time(context, *starttime,
 191                          starttime_str, sizeof(starttime_str), TRUE);
 192     else
 193         strlcpy(starttime_str, "unset", sizeof(starttime_str));
 194     krb5_format_time(context, endtime,
 195                      endtime_str, sizeof(endtime_str), TRUE);
 196     if (renew_till)
 197         krb5_format_time(context, *renew_till,
 198                          renewtime_str, sizeof(renewtime_str), TRUE);
 199     else
 200         strlcpy(renewtime_str, "unset", sizeof(renewtime_str));
 201
 202     kdc_log(context, config, 5,
 203             "%s authtime: %s starttime: %s endtime: %s renew till: %s",
 204             type, authtime_str, starttime_str, endtime_str, renewtime_str);
 205 }
 206
 207 static void
 208 log_patypes(krb5_context context,
 209             krb5_kdc_configuration *config,
 210             METHOD_DATA *padata)
 211 {
 212     struct rk_strpool *p = NULL;
 213     char *str;
 214     int i;
 215
 216     for (i = 0; i < padata->len; i++) {
 217         switch(padata->val[i].padata_type) {
 218         case KRB5_PADATA_PK_AS_REQ:
 219             p = rk_strpoolprintf(p, "PK-INIT(ietf)");
 220             break;
 221         case KRB5_PADATA_PK_AS_REQ_WIN:
 222             p = rk_strpoolprintf(p, "PK-INIT(win2k)");
 223             break;
 224         case KRB5_PADATA_PA_PK_OCSP_RESPONSE:
 225             p = rk_strpoolprintf(p, "OCSP");
 226             break;
 227         case KRB5_PADATA_ENC_TIMESTAMP:
 228             p = rk_strpoolprintf(p, "encrypted-timestamp");
 229             break;
 230         default:
 231             p = rk_strpoolprintf(p, "%d", padata->val[i].padata_type);
 232             break;
 233         }
 234         if (p && i + 1 < padata->len)
 235             p = rk_strpoolprintf(p, ", ");
 236         if (p == NULL) {
 237             kdc_log(context, config, 0, "out of memory");
 238             return;
 239         }
 240     }
 241     if (p == NULL)
 242         p = rk_strpoolprintf(p, "none");
 243
 244     str = rk_strpoolcollect(p);
 245     kdc_log(context, config, 0, "Client sent patypes: %s", str);
 246     free(str);
 247 }
 248
 249 /*
 250  *
 251  */
 252
 253
 254 krb5_error_code
 255 _kdc_encode_reply(krb5_context context,
 256                   krb5_kdc_configuration *config,
 257                   KDC_REP *rep, const EncTicketPart *et, EncKDCRepPart *ek,
 258                   krb5_enctype etype,
 259                   int skvno, const EncryptionKey *skey,
 260                   int ckvno, const EncryptionKey *reply_key,
 261                   int rk_is_subkey,
 262                   const char **e_text,
 263                   krb5_data *reply)
 264 {
 265     unsigned char *buf;
 266     size_t buf_size;
 267     size_t len;
 268     krb5_error_code ret;
 269     krb5_crypto crypto;
 270
 271     ASN1_MALLOC_ENCODE(EncTicketPart, buf, buf_size, et, &len, ret);
 272     if(ret) {
 273         const char *msg = krb5_get_error_message(context, ret);
 274         kdc_log(context, config, 0, "Failed to encode ticket: %s", msg);
 275         krb5_free_error_message(context, msg);
 276         return ret;
 277     }
 278     if(buf_size != len) {
 279         free(buf);
 280         kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
 281         *e_text = "KDC internal error";
 282         return KRB5KRB_ERR_GENERIC;
 283     }
 284
 285     ret = krb5_crypto_init(context, skey, etype, &crypto);
 286     if (ret) {
 287         const char *msg;
 288         free(buf);
 289         msg = krb5_get_error_message(context, ret);
 290         kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg);
 291         krb5_free_error_message(context, msg);
 292         return ret;
 293     }
 294
 295     ret = krb5_encrypt_EncryptedData(context,
 296                                      crypto,
 297                                      KRB5_KU_TICKET,
 298                                      buf,
 299                                      len,
 300                                      skvno,
 301                                      &rep->ticket.enc_part);
 302     free(buf);
 303     krb5_crypto_destroy(context, crypto);
 304     if(ret) {
 305         const char *msg = krb5_get_error_message(context, ret);
 306         kdc_log(context, config, 0, "Failed to encrypt data: %s", msg);
 307         krb5_free_error_message(context, msg);
 308         return ret;
 309     }
 310
 311     if(rep->msg_type == krb_as_rep && !config->encode_as_rep_as_tgs_rep)
 312         ASN1_MALLOC_ENCODE(EncASRepPart, buf, buf_size, ek, &len, ret);
 313     else
 314         ASN1_MALLOC_ENCODE(EncTGSRepPart, buf, buf_size, ek, &len, ret);
 315     if(ret) {
 316         const char *msg = krb5_get_error_message(context, ret);
 317         kdc_log(context, config, 0, "Failed to encode KDC-REP: %s", msg);
 318         krb5_free_error_message(context, msg);
 319         return ret;
 320     }
 321     if(buf_size != len) {
 322         free(buf);
 323         kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
 324         *e_text = "KDC internal error";
 325         return KRB5KRB_ERR_GENERIC;
 326     }
 327     ret = krb5_crypto_init(context, reply_key, 0, &crypto);
 328     if (ret) {
 329         const char *msg = krb5_get_error_message(context, ret);
 330         free(buf);
 331         kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg);
 332         krb5_free_error_message(context, msg);
 333         return ret;
 334     }
 335     if(rep->msg_type == krb_as_rep) {
 336         krb5_encrypt_EncryptedData(context,
 337                                    crypto,
 338                                    KRB5_KU_AS_REP_ENC_PART,
 339                                    buf,
 340                                    len,
 341                                    ckvno,
 342                                    &rep->enc_part);
 343         free(buf);
 344         ASN1_MALLOC_ENCODE(AS_REP, buf, buf_size, rep, &len, ret);
 345     } else {
 346         krb5_encrypt_EncryptedData(context,
 347                                    crypto,
 348                                    rk_is_subkey ? KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : KRB5_KU_TGS_REP_ENC_PART_SESSION,
 349                                    buf,
 350                                    len,
 351                                    ckvno,
 352                                    &rep->enc_part);
 353         free(buf);
 354         ASN1_MALLOC_ENCODE(TGS_REP, buf, buf_size, rep, &len, ret);
 355     }
 356     krb5_crypto_destroy(context, crypto);
 357     if(ret) {
 358         const char *msg = krb5_get_error_message(context, ret);
 359         kdc_log(context, config, 0, "Failed to encode KDC-REP: %s", msg);
 360         krb5_free_error_message(context, msg);
 361         return ret;
 362     }
 363     if(buf_size != len) {
 364         free(buf);
 365         kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
 366         *e_text = "KDC internal error";
 367         return KRB5KRB_ERR_GENERIC;
 368     }
 369     reply->data = buf;
 370     reply->length = buf_size;
 371     return 0;
 372 }
 373
 374 /*
 375  * Return 1 if the client have only older enctypes, this is for
 376  * determining if the server should send ETYPE_INFO2 or not.
 377  */
 378
 379 static int
 380 older_enctype(krb5_enctype enctype)
 381 {
 382     switch (enctype) {
 383     case ETYPE_DES_CBC_CRC:
 384     case ETYPE_DES_CBC_MD4:
 385     case ETYPE_DES_CBC_MD5:
 386     case ETYPE_DES3_CBC_SHA1:
 387     case ETYPE_ARCFOUR_HMAC_MD5:
 388     case ETYPE_ARCFOUR_HMAC_MD5_56:
 389     /*
 390      * The following three is "old" windows enctypes and is needed for
 391      * windows 2000 hosts.
 392      */
 393     case ETYPE_ARCFOUR_MD4:
 394     case ETYPE_ARCFOUR_HMAC_OLD:
 395     case ETYPE_ARCFOUR_HMAC_OLD_EXP:
 396         return 1;
 397     default:
 398         return 0;
 399     }
 400 }
 401
 402 /*
 403  *
 404  */
 405
 406 static krb5_error_code
 407 make_etype_info_entry(krb5_context context, ETYPE_INFO_ENTRY *ent, Key *key)
 408 {
 409     ent->etype = key->key.keytype;
 410     if(key->salt){
 411 #if 0
 412         ALLOC(ent->salttype);
 413
 414         if(key->salt->type == hdb_pw_salt)
 415             *ent->salttype = 0; /* or 1? or NULL? */
 416         else if(key->salt->type == hdb_afs3_salt)
 417             *ent->salttype = 2;
 418         else {
 419             kdc_log(context, config, 0, "unknown salt-type: %d",
 420                     key->salt->type);
 421             return KRB5KRB_ERR_GENERIC;
 422         }
 423         /* according to `the specs', we can't send a salt if
 424            we have AFS3 salted key, but that requires that you
 425            *know* what cell you are using (e.g by assuming
 426            that the cell is the same as the realm in lower
 427            case) */
 428 #elif 0
 429         ALLOC(ent->salttype);
 430         *ent->salttype = key->salt->type;
 431 #else
 432         /*
 433          * We shouldn't sent salttype since it is incompatible with the
 434          * specification and it breaks windows clients.  The afs
 435          * salting problem is solved by using KRB5-PADATA-AFS3-SALT
 436          * implemented in Heimdal 0.7 and later.
 437          */
 438         ent->salttype = NULL;
 439 #endif
 440         krb5_copy_data(context, &key->salt->salt,
 441                        &ent->salt);
 442     } else {
 443         /* we return no salt type at all, as that should indicate
 444          * the default salt type and make everybody happy.  some
 445          * systems (like w2k) dislike being told the salt type
 446          * here. */
 447
 448         ent->salttype = NULL;
 449         ent->salt = NULL;
 450     }
 451     return 0;
 452 }
 453
 454 static krb5_error_code
 455 get_pa_etype_info(krb5_context context,
 456                   krb5_kdc_configuration *config,
 457                   METHOD_DATA *md, Key *ckey)
 458 {
 459     krb5_error_code ret = 0;
 460     ETYPE_INFO pa;
 461     unsigned char *buf;
 462     size_t len;
 463
 464
 465     pa.len = 1;
 466     pa.val = calloc(1, sizeof(pa.val[0]));
 467     if(pa.val == NULL)
 468         return ENOMEM;
 469
 470     ret = make_etype_info_entry(context, &pa.val[0], ckey);
 471     if (ret) {
 472         free_ETYPE_INFO(&pa);
 473         return ret;
 474     }
 475
 476     ASN1_MALLOC_ENCODE(ETYPE_INFO, buf, len, &pa, &len, ret);
 477     free_ETYPE_INFO(&pa);
 478     if(ret)
 479         return ret;
 480     ret = realloc_method_data(md);
 481     if(ret) {
 482         free(buf);
 483         return ret;
 484     }
 485     md->val[md->len - 1].padata_type = KRB5_PADATA_ETYPE_INFO;
 486     md->val[md->len - 1].padata_value.length = len;
 487     md->val[md->len - 1].padata_value.data = buf;
 488     return 0;
 489 }
 490
 491 /*
 492  *
 493  */
 494
 495 extern int _krb5_AES_string_to_default_iterator;
 496
 497 static krb5_error_code
 498 make_etype_info2_entry(ETYPE_INFO2_ENTRY *ent, Key *key)
 499 {
 500     ent->etype = key->key.keytype;
 501     if(key->salt) {
 502         ALLOC(ent->salt);
 503         if (ent->salt == NULL)
 504             return ENOMEM;
 505         *ent->salt = malloc(key->salt->salt.length + 1);
 506         if (*ent->salt == NULL) {
 507             free(ent->salt);
 508             ent->salt = NULL;
 509             return ENOMEM;
 510         }
 511         memcpy(*ent->salt, key->salt->salt.data, key->salt->salt.length);
 512         (*ent->salt)[key->salt->salt.length] = '\0';
 513     } else
 514         ent->salt = NULL;
 515
 516     ent->s2kparams = NULL;
 517
 518     switch (key->key.keytype) {
 519     case ETYPE_AES128_CTS_HMAC_SHA1_96:
 520     case ETYPE_AES256_CTS_HMAC_SHA1_96:
 521         ALLOC(ent->s2kparams);
 522         if (ent->s2kparams == NULL)
 523             return ENOMEM;
 524         ent->s2kparams->length = 4;
 525         ent->s2kparams->data = malloc(ent->s2kparams->length);
 526         if (ent->s2kparams->data == NULL) {
 527             free(ent->s2kparams);
 528             ent->s2kparams = NULL;
 529             return ENOMEM;
 530         }
 531         _krb5_put_int(ent->s2kparams->data,
 532                       _krb5_AES_string_to_default_iterator,
 533                       ent->s2kparams->length);
 534         break;
 535     case ETYPE_DES_CBC_CRC:
 536     case ETYPE_DES_CBC_MD4:
 537     case ETYPE_DES_CBC_MD5:
 538         /* Check if this was a AFS3 salted key */
 539         if(key->salt && key->salt->type == hdb_afs3_salt){
 540             ALLOC(ent->s2kparams);
 541             if (ent->s2kparams == NULL)
 542                 return ENOMEM;
 543             ent->s2kparams->length = 1;
 544             ent->s2kparams->data = malloc(ent->s2kparams->length);
 545             if (ent->s2kparams->data == NULL) {
 546                 free(ent->s2kparams);
 547                 ent->s2kparams = NULL;
 548                 return ENOMEM;
 549             }
 550             _krb5_put_int(ent->s2kparams->data,
 551                           1,
 552                           ent->s2kparams->length);
 553         }
 554         break;
 555     default:
 556         break;
 557     }
 558     return 0;
 559 }
 560
 561 /*
 562  * Return an ETYPE-INFO2. Enctypes are storted the same way as in the
 563  * database (client supported enctypes first, then the unsupported
 564  * enctypes).
 565  */
 566
 567 static krb5_error_code
 568 get_pa_etype_info2(krb5_context context,
 569                    krb5_kdc_configuration *config,
 570                    METHOD_DATA *md, Key *ckey)
 571 {
 572     krb5_error_code ret = 0;
 573     ETYPE_INFO2 pa;
 574     unsigned char *buf;
 575     size_t len;
 576
 577     pa.len = 1;
 578     pa.val = calloc(1, sizeof(pa.val[0]));
 579     if(pa.val == NULL)
 580         return ENOMEM;
 581
 582     ret = make_etype_info2_entry(&pa.val[0], ckey);
 583     if (ret) {
 584         free_ETYPE_INFO2(&pa);
 585         return ret;
 586     }
 587
 588     ASN1_MALLOC_ENCODE(ETYPE_INFO2, buf, len, &pa, &len, ret);
 589     free_ETYPE_INFO2(&pa);
 590     if(ret)
 591         return ret;
 592     ret = realloc_method_data(md);
 593     if(ret) {
 594         free(buf);
 595         return ret;
 596     }
 597     md->val[md->len - 1].padata_type = KRB5_PADATA_ETYPE_INFO2;
 598     md->val[md->len - 1].padata_value.length = len;
 599     md->val[md->len - 1].padata_value.data = buf;
 600     return 0;
 601 }
 602
 603 /*
 604  *
 605  */
 606
 607 static void
 608 log_as_req(krb5_context context,
 609            krb5_kdc_configuration *config,
 610            krb5_enctype cetype,
 611            krb5_enctype setype,
 612            const KDC_REQ_BODY *b)
 613 {
 614     krb5_error_code ret;
 615     struct rk_strpool *p;
 616     char *str;
 617     int i;
 618
 619     p = rk_strpoolprintf(NULL, "%s", "Client supported enctypes: ");
 620
 621     for (i = 0; i < b->etype.len; i++) {
 622         ret = krb5_enctype_to_string(context, b->etype.val[i], &str);
 623         if (ret == 0) {
 624             p = rk_strpoolprintf(p, "%s", str);
 625             free(str);
 626         } else
 627             p = rk_strpoolprintf(p, "%d", b->etype.val[i]);
 628         if (p && i + 1 < b->etype.len)
 629             p = rk_strpoolprintf(p, ", ");
 630         if (p == NULL) {
 631             kdc_log(context, config, 0, "out of memory");
 632             return;
 633         }
 634     }
 635     if (p == NULL)
 636         p = rk_strpoolprintf(p, "no encryption types");
 637
 638     {
 639         char *cet;
 640         char *set;
 641
 642         ret = krb5_enctype_to_string(context, cetype, &cet);
 643         if(ret == 0) {
 644             ret = krb5_enctype_to_string(context, setype, &set);
 645             if (ret == 0) {
 646                 p = rk_strpoolprintf(p, ", using %s/%s", cet, set);
 647                 free(set);
 648             }
 649             free(cet);
 650         }
 651         if (ret != 0)
 652             p = rk_strpoolprintf(p, ", using enctypes %d/%d",
 653                                  cetype, setype);
 654     }
 655
 656     str = rk_strpoolcollect(p);
 657     kdc_log(context, config, 0, "%s", str);
 658     free(str);
 659
 660     {
 661         char fixedstr[128];
 662         unparse_flags(KDCOptions2int(b->kdc_options), asn1_KDCOptions_units(),
 663                       fixedstr, sizeof(fixedstr));
 664         if(*fixedstr)
 665             kdc_log(context, config, 0, "Requested flags: %s", fixedstr);
 666     }
 667 }
 668
 669 /*
 670  * verify the flags on `client' and `server', returning 0
 671  * if they are OK and generating an error messages and returning
 672  * and error code otherwise.
 673  */
 674
 675 krb5_error_code
 676 kdc_check_flags(krb5_context context,
 677                 krb5_kdc_configuration *config,
 678                 hdb_entry_ex *client_ex, const char *client_name,
 679                 hdb_entry_ex *server_ex, const char *server_name,
 680                 krb5_boolean is_as_req)
 681 {
 682     if(client_ex != NULL) {
 683         hdb_entry *client = &client_ex->entry;
 684
 685         /* check client */
 686         if (client->flags.locked_out) {
 687             kdc_log(context, config, 0,
 688                     "Client (%s) is locked out", client_name);
 689             return KRB5KDC_ERR_POLICY;
 690         }
 691
 692         if (client->flags.invalid) {
 693             kdc_log(context, config, 0,
 694                     "Client (%s) has invalid bit set", client_name);
 695             return KRB5KDC_ERR_POLICY;
 696         }
 697
 698         if(!client->flags.client){
 699             kdc_log(context, config, 0,
 700                     "Principal may not act as client -- %s", client_name);
 701             return KRB5KDC_ERR_POLICY;
 702         }
 703
 704         if (client->valid_start && *client->valid_start > kdc_time) {
 705             char starttime_str[100];
 706             krb5_format_time(context, *client->valid_start,
 707                              starttime_str, sizeof(starttime_str), TRUE);
 708             kdc_log(context, config, 0,
 709                     "Client not yet valid until %s -- %s",
 710                     starttime_str, client_name);
 711             return KRB5KDC_ERR_CLIENT_NOTYET;
 712         }
 713
 714         if (client->valid_end && *client->valid_end < kdc_time) {
 715             char endtime_str[100];
 716             krb5_format_time(context, *client->valid_end,
 717                              endtime_str, sizeof(endtime_str), TRUE);
 718             kdc_log(context, config, 0,
 719                     "Client expired at %s -- %s",
 720                     endtime_str, client_name);
 721             return KRB5KDC_ERR_NAME_EXP;
 722         }
 723
 724         if (client->pw_end && *client->pw_end < kdc_time
 725             && (server_ex == NULL || !server_ex->entry.flags.change_pw)) {
 726             char pwend_str[100];
 727             krb5_format_time(context, *client->pw_end,
 728                              pwend_str, sizeof(pwend_str), TRUE);
 729             kdc_log(context, config, 0,
 730                     "Client's key has expired at %s -- %s",
 731                     pwend_str, client_name);
 732             return KRB5KDC_ERR_KEY_EXPIRED;
 733         }
 734     }
 735
 736     /* check server */
 737
 738     if (server_ex != NULL) {
 739         hdb_entry *server = &server_ex->entry;
 740
 741         if (server->flags.locked_out) {
 742             kdc_log(context, config, 0,
 743                     "Client server locked out -- %s", server_name);
 744             return KRB5KDC_ERR_POLICY;
 745         }
 746         if (server->flags.invalid) {
 747             kdc_log(context, config, 0,
 748                     "Server has invalid flag set -- %s", server_name);
 749             return KRB5KDC_ERR_POLICY;
 750         }
 751
 752         if(!server->flags.server){
 753             kdc_log(context, config, 0,
 754                     "Principal may not act as server -- %s", server_name);
 755             return KRB5KDC_ERR_POLICY;
 756         }
 757
 758         if(!is_as_req && server->flags.initial) {
 759             kdc_log(context, config, 0,
 760                     "AS-REQ is required for server -- %s", server_name);
 761             return KRB5KDC_ERR_POLICY;
 762         }
 763
 764         if (server->valid_start && *server->valid_start > kdc_time) {
 765             char starttime_str[100];
 766             krb5_format_time(context, *server->valid_start,
 767                              starttime_str, sizeof(starttime_str), TRUE);
 768             kdc_log(context, config, 0,
 769                     "Server not yet valid until %s -- %s",
 770                     starttime_str, server_name);
 771             return KRB5KDC_ERR_SERVICE_NOTYET;
 772         }
 773
 774         if (server->valid_end && *server->valid_end < kdc_time) {
 775             char endtime_str[100];
 776             krb5_format_time(context, *server->valid_end,
 777                              endtime_str, sizeof(endtime_str), TRUE);
 778             kdc_log(context, config, 0,
 779                     "Server expired at %s -- %s",
 780                     endtime_str, server_name);
 781             return KRB5KDC_ERR_SERVICE_EXP;
 782         }
 783
 784         if (server->pw_end && *server->pw_end < kdc_time) {
 785             char pwend_str[100];
 786             krb5_format_time(context, *server->pw_end,
 787                              pwend_str, sizeof(pwend_str), TRUE);
 788             kdc_log(context, config, 0,
 789                     "Server's key has expired at -- %s",
 790                     pwend_str, server_name);
 791             return KRB5KDC_ERR_KEY_EXPIRED;
 792         }
 793     }
 794     return 0;
 795 }
 796
 797 /*
 798  * Return TRUE if `from' is part of `addresses' taking into consideration
 799  * the configuration variables that tells us how strict we should be about
 800  * these checks
 801  */
 802
 803 krb5_boolean
 804 _kdc_check_addresses(krb5_context context,
 805                      krb5_kdc_configuration *config,
 806                      HostAddresses *addresses, const struct sockaddr *from)
 807 {
 808     krb5_error_code ret;
 809     krb5_address addr;
 810     krb5_boolean result;
 811     krb5_boolean only_netbios = TRUE;
 812     int i;
 813
 814     if(config->check_ticket_addresses == 0)
 815         return TRUE;
 816
 817     if(addresses == NULL)
 818         return config->allow_null_ticket_addresses;
 819
 820     for (i = 0; i < addresses->len; ++i) {
 821         if (addresses->val[i].addr_type != KRB5_ADDRESS_NETBIOS) {
 822             only_netbios = FALSE;
 823         }
 824     }
 825
 826     /* Windows sends it's netbios name, which I can only assume is
 827      * used for the 'allowed workstations' check.  This is painful,
 828      * but we still want to check IP addresses if they happen to be
 829      * present.
 830      */
 831
 832     if(only_netbios)
 833         return config->allow_null_ticket_addresses;
 834
 835     ret = krb5_sockaddr2address (context, from, &addr);
 836     if(ret)
 837         return FALSE;
 838
 839     result = krb5_address_search(context, &addr, addresses);
 840     krb5_free_address (context, &addr);
 841     return result;
 842 }
 843
 844 /*
 845  *
 846  */
 847
 848 static krb5_boolean
 849 send_pac_p(krb5_context context, KDC_REQ *req)
 850 {
 851     krb5_error_code ret;
 852     PA_PAC_REQUEST pacreq;
 853     const PA_DATA *pa;
 854     int i = 0;
 855
 856     pa = _kdc_find_padata(req, &i, KRB5_PADATA_PA_PAC_REQUEST);
 857     if (pa == NULL)
 858         return TRUE;
 859
 860     ret = decode_PA_PAC_REQUEST(pa->padata_value.data,
 861                                 pa->padata_value.length,
 862                                 &pacreq,
 863                                 NULL);
 864     if (ret)
 865         return TRUE;
 866     i = pacreq.include_pac;
 867     free_PA_PAC_REQUEST(&pacreq);
 868     if (i == 0)
 869         return FALSE;
 870     return TRUE;
 871 }
 872
 873 krb5_boolean
 874 _kdc_is_anonymous(krb5_context context, krb5_principal principal)
 875 {
 876     if (principal->name.name_type != KRB5_NT_WELLKNOWN ||
 877         principal->name.name_string.len != 2 ||
 878         strcmp(principal->name.name_string.val[0], KRB5_WELLKNOWN_NAME) != 0 ||
 879         strcmp(principal->name.name_string.val[1], KRB5_ANON_NAME) != 0)
 880         return 0;
 881     return 1;
 882 }
 883
 884 /*
 885  *
 886  */
 887
 888 krb5_error_code
 889 _kdc_as_rep(krb5_context context,
 890             krb5_kdc_configuration *config,
 891             KDC_REQ *req,
 892             const krb5_data *req_buffer,
 893             krb5_data *reply,
 894             const char *from,
 895             struct sockaddr *from_addr,
 896             int datagram_reply)
 897 {
 898     KDC_REQ_BODY *b = &req->req_body;
 899     AS_REP rep;
 900     KDCOptions f = b->kdc_options;
 901     hdb_entry_ex *client = NULL, *server = NULL;
 902     HDB *clientdb;
 903     krb5_enctype setype, sessionetype;
 904     krb5_data e_data;
 905     EncTicketPart et;
 906     EncKDCRepPart ek;
 907     krb5_principal client_princ = NULL, server_princ = NULL;
 908     char *client_name = NULL, *server_name = NULL;
 909     krb5_error_code ret = 0;
 910     const char *e_text = NULL;
 911     krb5_crypto crypto;
 912     Key *ckey, *skey;
 913     EncryptionKey *reply_key = NULL, session_key;
 914     int flags = 0;
 915 #ifdef PKINIT
 916     pk_client_params *pkp = NULL;
 917 #endif
 918
 919     memset(&rep, 0, sizeof(rep));
 920     memset(&session_key, 0, sizeof(session_key));
 921     krb5_data_zero(&e_data);
 922
 923     ALLOC(rep.padata);
 924     rep.padata->len = 0;
 925     rep.padata->val = NULL;
 926
 927     if (f.canonicalize)
 928         flags |= HDB_F_CANON;
 929
 930     if(b->sname == NULL){
 931         ret = KRB5KRB_ERR_GENERIC;
 932         e_text = "No server in request";
 933     } else{
 934         ret = _krb5_principalname2krb5_principal (context,
 935                                                   &server_princ,
 936                                                   *(b->sname),
 937                                                   b->realm);
 938         if (ret == 0)
 939             ret = krb5_unparse_name(context, server_princ, &server_name);
 940     }
 941     if (ret) {
 942         kdc_log(context, config, 0,
 943                 "AS-REQ malformed server name from %s", from);
 944         goto out;
 945     }
 946     if(b->cname == NULL){
 947         ret = KRB5KRB_ERR_GENERIC;
 948         e_text = "No client in request";
 949     } else {
 950         ret = _krb5_principalname2krb5_principal (context,
 951                                                   &client_princ,
 952                                                   *(b->cname),
 953                                                   b->realm);
 954         if (ret)
 955             goto out;
 956
 957         ret = krb5_unparse_name(context, client_princ, &client_name);
 958     }
 959     if (ret) {
 960         kdc_log(context, config, 0,
 961                 "AS-REQ malformed client name from %s", from);
 962         goto out;
 963     }
 964
 965     kdc_log(context, config, 0, "AS-REQ %s from %s for %s",
 966             client_name, from, server_name);
 967
 968     /*
 969      *
 970      */
 971
 972     if (_kdc_is_anonymous(context, client_princ)) {
 973         if (!b->kdc_options.request_anonymous) {
 974             kdc_log(context, config, 0, "Anonymous ticket w/o anonymous flag");
 975             ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
 976             goto out;
 977         }
 978     } else if (b->kdc_options.request_anonymous) {
 979         kdc_log(context, config, 0,
 980                 "Request for a anonymous ticket with non "
 981                 "anonymous client name: %s", client_name);
 982         ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
 983         goto out;
 984     }
 985
 986     /*
 987      *
 988      */
 989
 990     ret = _kdc_db_fetch(context, config, client_princ,
 991                         HDB_F_GET_CLIENT | flags, NULL,
 992                         &clientdb, &client);
 993     if(ret == HDB_ERR_NOT_FOUND_HERE) {
 994         kdc_log(context, config, 5, "client %s does not have secrets at this KDC, need to proxy", client_name);
 995         goto out;
 996     } else if(ret){
 997         const char *msg = krb5_get_error_message(context, ret);
 998         kdc_log(context, config, 0, "UNKNOWN -- %s: %s", client_name, msg);
 999         krb5_free_error_message(context, msg);
1000         ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
1001         goto out;
1002     }
1003     ret = _kdc_db_fetch(context, config, server_princ,
1004                         HDB_F_GET_SERVER|HDB_F_GET_KRBTGT | flags,
1005                         NULL, NULL, &server);
1006     if(ret == HDB_ERR_NOT_FOUND_HERE) {
1007         kdc_log(context, config, 5, "target %s does not have secrets at this KDC, need to proxy", server_name);
1008         goto out;
1009     } else if(ret){
1010         const char *msg = krb5_get_error_message(context, ret);
1011         kdc_log(context, config, 0, "UNKNOWN -- %s: %s", server_name, msg);
1012         krb5_free_error_message(context, msg);
1013         ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
1014         goto out;
1015     }
1016
1017     memset(&et, 0, sizeof(et));
1018     memset(&ek, 0, sizeof(ek));
1019
1020     /*
1021      * Select a session enctype from the list of the crypto systems
1022      * supported enctype, is supported by the client and is one of the
1023      * enctype of the enctype of the krbtgt.
1024      *
1025      * The later is used as a hint what enctype all KDC are supporting
1026      * to make sure a newer version of KDC wont generate a session
1027      * enctype that and older version of a KDC in the same realm can't
1028      * decrypt.
1029      *
1030      * But if the KDC admin is paranoid and doesn't want to have "no
1031      * the best" enctypes on the krbtgt, lets save the best pick from
1032      * the client list and hope that that will work for any other
1033      * KDCs.
1034      */
1035     {
1036         const krb5_enctype *p;
1037         krb5_enctype clientbest = ETYPE_NULL;
1038         int i, j;
1039
1040         p = krb5_kerberos_enctypes(context);
1041
1042         sessionetype = ETYPE_NULL;
1043
1044         for (i = 0; p[i] != ETYPE_NULL && sessionetype == ETYPE_NULL; i++) {
1045             if (krb5_enctype_valid(context, p[i]) != 0)
1046                 continue;
1047
1048             for (j = 0; j < b->etype.len && sessionetype == ETYPE_NULL; j++) {
1049                 Key *dummy;
1050                 /* check with client */
1051                 if (p[i] != b->etype.val[j])
1052                     continue;
1053                 /* save best of union of { client, crypto system } */
1054                 if (clientbest == ETYPE_NULL)
1055                     clientbest = p[i];
1056                 /* check with krbtgt */
1057                 ret = hdb_enctype2key(context, &server->entry, p[i], &dummy);
1058                 if (ret)
1059                     continue;
1060                 sessionetype = p[i];
1061             }
1062         }
1063         /* if krbtgt had no shared keys with client, pick clients best */
1064         if (clientbest != ETYPE_NULL && sessionetype == ETYPE_NULL) {
1065             sessionetype = clientbest;
1066         } else if (sessionetype == ETYPE_NULL) {
1067             kdc_log(context, config, 0,
1068                     "Client (%s) from %s has no common enctypes with KDC"
1069                     "to use for the session key",
1070                     client_name, from);
1071             goto out;
1072         }
1073     }
1074
1075     /*
1076      * Pre-auth processing
1077      */
1078
1079     if(req->padata){
1080         int i;
1081         const PA_DATA *pa;
1082         int found_pa = 0;
1083
1084         log_patypes(context, config, req->padata);
1085
1086 #ifdef PKINIT
1087         kdc_log(context, config, 5,
1088                 "Looking for PKINIT pa-data -- %s", client_name);
1089
1090         e_text = "No PKINIT PA found";
1091
1092         i = 0;
1093         pa = _kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_REQ);
1094         if (pa == NULL) {
1095             i = 0;
1096             pa = _kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_REQ_WIN);
1097         }
1098         if (pa) {
1099             char *client_cert = NULL;
1100
1101             ret = _kdc_pk_rd_padata(context, config, req, pa, client, &pkp);
1102             if (ret) {
1103                 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1104                 kdc_log(context, config, 5,
1105                         "Failed to decode PKINIT PA-DATA -- %s",
1106                         client_name);
1107                 goto ts_enc;
1108             }
1109             if (ret == 0 && pkp == NULL)
1110                 goto ts_enc;
1111
1112             ret = _kdc_pk_check_client(context,
1113                                        config,
1114                                        clientdb,
1115                                        client,
1116                                        pkp,
1117                                        &client_cert);
1118             if (ret) {
1119                 e_text = "PKINIT certificate not allowed to "
1120                     "impersonate principal";
1121                 _kdc_pk_free_client_param(context, pkp);
1122
1123                 kdc_log(context, config, 0, "%s", e_text);
1124                 pkp = NULL;
1125                 goto out;
1126             }
1127
1128             found_pa = 1;
1129             et.flags.pre_authent = 1;
1130             kdc_log(context, config, 0,
1131                     "PKINIT pre-authentication succeeded -- %s using %s",
1132                     client_name, client_cert);
1133             free(client_cert);
1134             if (pkp)
1135                 goto preauth_done;
1136         }
1137     ts_enc:
1138 #endif
1139         kdc_log(context, config, 5, "Looking for ENC-TS pa-data -- %s",
1140                 client_name);
1141
1142         i = 0;
1143         e_text = "No ENC-TS found";
1144         while((pa = _kdc_find_padata(req, &i, KRB5_PADATA_ENC_TIMESTAMP))){
1145             krb5_data ts_data;
1146             PA_ENC_TS_ENC p;
1147             size_t len;
1148             EncryptedData enc_data;
1149             Key *pa_key;
1150             char *str;
1151
1152             found_pa = 1;
1153
1154             if (b->kdc_options.request_anonymous) {
1155                 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1156                 kdc_log(context, config, 0, "ENC-TS doesn't support anon");
1157                 goto out;
1158             }
1159
1160             ret = decode_EncryptedData(pa->padata_value.data,
1161                                        pa->padata_value.length,
1162                                        &enc_data,
1163                                        &len);
1164             if (ret) {
1165                 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1166                 kdc_log(context, config, 5, "Failed to decode PA-DATA -- %s",
1167                         client_name);
1168                 goto out;
1169             }
1170
1171             ret = hdb_enctype2key(context, &client->entry,
1172                                   enc_data.etype, &pa_key);
1173             if(ret){
1174                 char *estr;
1175                 e_text = "No key matches pa-data";
1176                 ret = KRB5KDC_ERR_ETYPE_NOSUPP;
1177                 if(krb5_enctype_to_string(context, enc_data.etype, &estr))
1178                     estr = NULL;
1179                 if(estr == NULL)
1180                     kdc_log(context, config, 5,
1181                             "No client key matching pa-data (%d) -- %s",
1182                             enc_data.etype, client_name);
1183                 else
1184                     kdc_log(context, config, 5,
1185                             "No client key matching pa-data (%s) -- %s",
1186                             estr, client_name);
1187                 free(estr);
1188                 free_EncryptedData(&enc_data);
1189
1190                 continue;
1191             }
1192
1193         try_next_key:
1194             ret = krb5_crypto_init(context, &pa_key->key, 0, &crypto);
1195             if (ret) {
1196                 const char *msg = krb5_get_error_message(context, ret);
1197                 kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg);
1198                 krb5_free_error_message(context, msg);
1199                 free_EncryptedData(&enc_data);
1200                 continue;
1201             }
1202
1203             ret = krb5_decrypt_EncryptedData (context,
1204                                               crypto,
1205                                               KRB5_KU_PA_ENC_TIMESTAMP,
1206                                               &enc_data,
1207                                               &ts_data);
1208             krb5_crypto_destroy(context, crypto);
1209             /*
1210              * Since the user might have several keys with the same
1211              * enctype but with diffrent salting, we need to try all
1212              * the keys with the same enctype.
1213              */
1214             if(ret){
1215                 krb5_error_code ret2;
1216                 const char *msg = krb5_get_error_message(context, ret);
1217
1218                 ret2 = krb5_enctype_to_string(context,
1219                                               pa_key->key.keytype, &str);
1220                 if (ret2)
1221                     str = NULL;
1222                 kdc_log(context, config, 5,
1223                         "Failed to decrypt PA-DATA -- %s "
1224                         "(enctype %s) error %s",
1225                         client_name, str ? str : "unknown enctype", msg);
1226                 krb5_free_error_message(context, msg);
1227                 free(str);
1228
1229                 if(hdb_next_enctype2key(context, &client->entry,
1230                                         enc_data.etype, &pa_key) == 0)
1231                     goto try_next_key;
1232                 e_text = "Failed to decrypt PA-DATA";
1233
1234                 free_EncryptedData(&enc_data);
1235
1236                 if (clientdb->hdb_auth_status)
1237                     (clientdb->hdb_auth_status)(context, clientdb, client, HDB_AUTH_WRONG_PASSWORD);
1238
1239                 ret = KRB5KDC_ERR_PREAUTH_FAILED;
1240                 continue;
1241             }
1242             free_EncryptedData(&enc_data);
1243             ret = decode_PA_ENC_TS_ENC(ts_data.data,
1244                                        ts_data.length,
1245                                        &p,
1246                                        &len);
1247             krb5_data_free(&ts_data);
1248             if(ret){
1249                 e_text = "Failed to decode PA-ENC-TS-ENC";
1250                 ret = KRB5KDC_ERR_PREAUTH_FAILED;
1251                 kdc_log(context, config,
1252                         5, "Failed to decode PA-ENC-TS_ENC -- %s",
1253                         client_name);
1254                 continue;
1255             }
1256             free_PA_ENC_TS_ENC(&p);
1257             if (abs(kdc_time - p.patimestamp) > context->max_skew) {
1258                 char client_time[100];
1259
1260                 krb5_format_time(context, p.patimestamp,
1261                                  client_time, sizeof(client_time), TRUE);
1262
1263                 ret = KRB5KRB_AP_ERR_SKEW;
1264                 kdc_log(context, config, 0,
1265                         "Too large time skew, "
1266                         "client time %s is out by %u > %u seconds -- %s",
1267                         client_time,
1268                         (unsigned)abs(kdc_time - p.patimestamp),
1269                         context->max_skew,
1270                         client_name);
1271
1272                 /*
1273                  * The following is needed to make windows clients to
1274                  * retry using the timestamp in the error message, if
1275                  * there is a e_text, they become unhappy.
1276                  */
1277                 e_text = NULL;
1278                 goto out;
1279             }
1280             et.flags.pre_authent = 1;
1281
1282             set_salt_padata(rep.padata, pa_key->salt);
1283
1284             reply_key = &pa_key->key;
1285
1286             ret = krb5_enctype_to_string(context, pa_key->key.keytype, &str);
1287             if (ret)
1288                 str = NULL;
1289
1290             kdc_log(context, config, 2,
1291                     "ENC-TS Pre-authentication succeeded -- %s using %s",
1292                     client_name, str ? str : "unknown enctype");
1293             free(str);
1294             break;
1295         }
1296 #ifdef PKINIT
1297     preauth_done:
1298 #endif
1299         if(found_pa == 0 && config->require_preauth)
1300             goto use_pa;
1301         /* We come here if we found a pa-enc-timestamp, but if there
1302            was some problem with it, other than too large skew */
1303         if(found_pa && et.flags.pre_authent == 0){
1304             kdc_log(context, config, 0, "%s -- %s", e_text, client_name);
1305             e_text = NULL;
1306             goto out;
1307         }
1308     }else if (config->require_preauth
1309               || b->kdc_options.request_anonymous /* hack to force anon */
1310               || client->entry.flags.require_preauth
1311               || server->entry.flags.require_preauth) {
1312         METHOD_DATA method_data;
1313         PA_DATA *pa;
1314         unsigned char *buf;
1315         size_t len;
1316
1317     use_pa:
1318         method_data.len = 0;
1319         method_data.val = NULL;
1320
1321         ret = realloc_method_data(&method_data);
1322         if (ret) {
1323             free_METHOD_DATA(&method_data);
1324             goto out;
1325         }
1326         pa = &method_data.val[method_data.len-1];
1327         pa->padata_type         = KRB5_PADATA_ENC_TIMESTAMP;
1328         pa->padata_value.length = 0;
1329         pa->padata_value.data   = NULL;
1330
1331 #ifdef PKINIT
1332         ret = realloc_method_data(&method_data);
1333         if (ret) {
1334             free_METHOD_DATA(&method_data);
1335             goto out;
1336         }
1337         pa = &method_data.val[method_data.len-1];
1338         pa->padata_type         = KRB5_PADATA_PK_AS_REQ;
1339         pa->padata_value.length = 0;
1340         pa->padata_value.data   = NULL;
1341
1342         ret = realloc_method_data(&method_data);
1343         if (ret) {
1344             free_METHOD_DATA(&method_data);
1345             goto out;
1346         }
1347         pa = &method_data.val[method_data.len-1];
1348         pa->padata_type         = KRB5_PADATA_PK_AS_REQ_WIN;
1349         pa->padata_value.length = 0;
1350         pa->padata_value.data   = NULL;
1351 #endif
1352
1353         /*
1354          * If there is a client key, send ETYPE_INFO{,2}
1355          */
1356         ret = _kdc_find_etype(context, client, b->etype.val, b->etype.len,
1357                               &ckey);
1358         if (ret == 0) {
1359
1360             /*
1361              * RFC4120 requires:
1362              * - If the client only knows about old enctypes, then send
1363              *   both info replies (we send 'info' first in the list).
1364              * - If the client is 'modern', because it knows about 'new'
1365              *   enctype types, then only send the 'info2' reply.
1366              *
1367              * Before we send the full list of etype-info data, we pick
1368              * the client key we would have used anyway below, just pick
1369              * that instead.
1370              */
1371
1372             if (older_enctype(ckey->key.keytype)) {
1373                 ret = get_pa_etype_info(context, config,
1374                                         &method_data, ckey);
1375                 if (ret) {
1376                     free_METHOD_DATA(&method_data);
1377                     goto out;
1378                 }
1379             }
1380             ret = get_pa_etype_info2(context, config,
1381                                      &method_data, ckey);
1382             if (ret) {
1383                 free_METHOD_DATA(&method_data);
1384                 goto out;
1385             }
1386         }
1387
1388         ASN1_MALLOC_ENCODE(METHOD_DATA, buf, len, &method_data, &len, ret);
1389         free_METHOD_DATA(&method_data);
1390
1391         e_data.data   = buf;
1392         e_data.length = len;
1393         e_text ="Need to use PA-ENC-TIMESTAMP/PA-PK-AS-REQ",
1394
1395         ret = KRB5KDC_ERR_PREAUTH_REQUIRED;
1396
1397         kdc_log(context, config, 0,
1398                 "No preauth found, returning PREAUTH-REQUIRED -- %s",
1399                 client_name);
1400         goto out;
1401     }
1402
1403     if (clientdb->hdb_auth_status)
1404         (clientdb->hdb_auth_status)(context, clientdb, client,
1405                                     HDB_AUTH_SUCCESS);
1406
1407     /*
1408      * Verify flags after the user been required to prove its identity
1409      * with in a preauth mech.
1410      */
1411
1412     ret = _kdc_check_access(context, config, client, client_name,
1413                             server, server_name,
1414                             req, &e_data);
1415     if(ret)
1416         goto out;
1417
1418     /*
1419      * Selelct the best encryption type for the KDC with out regard to
1420      * the client since the client never needs to read that data.
1421      */
1422
1423     ret = _kdc_get_preferred_key(context, config,
1424                                  server, server_name,
1425                                  &setype, &skey);
1426     if(ret)
1427         goto out;
1428
1429     if(f.renew || f.validate || f.proxy || f.forwarded || f.enc_tkt_in_skey
1430        || (f.request_anonymous && !config->allow_anonymous)) {
1431         ret = KRB5KDC_ERR_BADOPTION;
1432         e_text = "Bad KDC options";
1433         kdc_log(context, config, 0, "Bad KDC options -- %s", client_name);
1434         goto out;
1435     }
1436
1437     rep.pvno = 5;
1438     rep.msg_type = krb_as_rep;
1439
1440     ret = copy_Realm(&client->entry.principal->realm, &rep.crealm);
1441     if (ret)
1442         goto out;
1443     ret = _krb5_principal2principalname(&rep.cname, client->entry.principal);
1444     if (ret)
1445         goto out;
1446
1447     rep.ticket.tkt_vno = 5;
1448     copy_Realm(&server->entry.principal->realm, &rep.ticket.realm);
1449     _krb5_principal2principalname(&rep.ticket.sname,
1450                                   server->entry.principal);
1451     /* java 1.6 expects the name to be the same type, lets allow that
1452      * uncomplicated name-types. */
1453 #define CNT(sp,t) (((sp)->sname->name_type) == KRB5_NT_##t)
1454     if (CNT(b, UNKNOWN) || CNT(b, PRINCIPAL) || CNT(b, SRV_INST) || CNT(b, SRV_HST) || CNT(b, SRV_XHST))
1455         rep.ticket.sname.name_type = b->sname->name_type;
1456 #undef CNT
1457
1458     et.flags.initial = 1;
1459     if(client->entry.flags.forwardable && server->entry.flags.forwardable)
1460         et.flags.forwardable = f.forwardable;
1461     else if (f.forwardable) {
1462         e_text = "Ticket may not be forwardable";
1463         ret = KRB5KDC_ERR_POLICY;
1464         kdc_log(context, config, 0,
1465                 "Ticket may not be forwardable -- %s", client_name);
1466         goto out;
1467     }
1468     if(client->entry.flags.proxiable && server->entry.flags.proxiable)
1469         et.flags.proxiable = f.proxiable;
1470     else if (f.proxiable) {
1471         e_text = "Ticket may not be proxiable";
1472         ret = KRB5KDC_ERR_POLICY;
1473         kdc_log(context, config, 0,
1474                 "Ticket may not be proxiable -- %s", client_name);
1475         goto out;
1476     }
1477     if(client->entry.flags.postdate && server->entry.flags.postdate)
1478         et.flags.may_postdate = f.allow_postdate;
1479     else if (f.allow_postdate){
1480         e_text = "Ticket may not be postdate";
1481         ret = KRB5KDC_ERR_POLICY;
1482         kdc_log(context, config, 0,
1483                 "Ticket may not be postdatable -- %s", client_name);
1484         goto out;
1485     }
1486
1487     /* check for valid set of addresses */
1488     if(!_kdc_check_addresses(context, config, b->addresses, from_addr)) {
1489         e_text = "Bad address list in requested";
1490         ret = KRB5KRB_AP_ERR_BADADDR;
1491         kdc_log(context, config, 0,
1492                 "Bad address list requested -- %s", client_name);
1493         goto out;
1494     }
1495
1496     ret = copy_PrincipalName(&rep.cname, &et.cname);
1497     if (ret)
1498         goto out;
1499     ret = copy_Realm(&rep.crealm, &et.crealm);
1500     if (ret)
1501         goto out;
1502
1503     {
1504         time_t start;
1505         time_t t;
1506
1507         start = et.authtime = kdc_time;
1508
1509         if(f.postdated && req->req_body.from){
1510             ALLOC(et.starttime);
1511             start = *et.starttime = *req->req_body.from;
1512             et.flags.invalid = 1;
1513             et.flags.postdated = 1; /* XXX ??? */
1514         }
1515         _kdc_fix_time(&b->till);
1516         t = *b->till;
1517
1518         /* be careful not overflowing */
1519
1520         if(client->entry.max_life)
1521             t = start + min(t - start, *client->entry.max_life);
1522         if(server->entry.max_life)
1523             t = start + min(t - start, *server->entry.max_life);
1524 #if 0
1525         t = min(t, start + realm->max_life);
1526 #endif
1527         et.endtime = t;
1528         if(f.renewable_ok && et.endtime < *b->till){
1529             f.renewable = 1;
1530             if(b->rtime == NULL){
1531                 ALLOC(b->rtime);
1532                 *b->rtime = 0;
1533             }
1534             if(*b->rtime < *b->till)
1535                 *b->rtime = *b->till;
1536         }
1537         if(f.renewable && b->rtime){
1538             t = *b->rtime;
1539             if(t == 0)
1540                 t = MAX_TIME;
1541             if(client->entry.max_renew)
1542                 t = start + min(t - start, *client->entry.max_renew);
1543             if(server->entry.max_renew)
1544                 t = start + min(t - start, *server->entry.max_renew);
1545 #if 0
1546             t = min(t, start + realm->max_renew);
1547 #endif
1548             ALLOC(et.renew_till);
1549             *et.renew_till = t;
1550             et.flags.renewable = 1;
1551         }
1552     }
1553
1554     if (f.request_anonymous)
1555         et.flags.anonymous = 1;
1556
1557     if(b->addresses){
1558         ALLOC(et.caddr);
1559         copy_HostAddresses(b->addresses, et.caddr);
1560     }
1561
1562     et.transited.tr_type = DOMAIN_X500_COMPRESS;
1563     krb5_data_zero(&et.transited.contents);
1564
1565     /* The MIT ASN.1 library (obviously) doesn't tell lengths encoded
1566      * as 0 and as 0x80 (meaning indefinite length) apart, and is thus
1567      * incapable of correctly decoding SEQUENCE OF's of zero length.
1568      *
1569      * To fix this, always send at least one no-op last_req
1570      *
1571      * If there's a pw_end or valid_end we will use that,
1572      * otherwise just a dummy lr.
1573      */
1574     ek.last_req.val = malloc(2 * sizeof(*ek.last_req.val));
1575     if (ek.last_req.val == NULL) {
1576         ret = ENOMEM;
1577         goto out;
1578     }
1579     ek.last_req.len = 0;
1580     if (client->entry.pw_end
1581         && (config->kdc_warn_pwexpire == 0
1582             || kdc_time + config->kdc_warn_pwexpire >= *client->entry.pw_end)) {
1583         ek.last_req.val[ek.last_req.len].lr_type  = LR_PW_EXPTIME;
1584         ek.last_req.val[ek.last_req.len].lr_value = *client->entry.pw_end;
1585         ++ek.last_req.len;
1586     }
1587     if (client->entry.valid_end) {
1588         ek.last_req.val[ek.last_req.len].lr_type  = LR_ACCT_EXPTIME;
1589         ek.last_req.val[ek.last_req.len].lr_value = *client->entry.valid_end;
1590         ++ek.last_req.len;
1591     }
1592     if (ek.last_req.len == 0) {
1593         ek.last_req.val[ek.last_req.len].lr_type  = LR_NONE;
1594         ek.last_req.val[ek.last_req.len].lr_value = 0;
1595         ++ek.last_req.len;
1596     }
1597     ek.nonce = b->nonce;
1598     if (client->entry.valid_end || client->entry.pw_end) {
1599         ALLOC(ek.key_expiration);
1600         if (client->entry.valid_end) {
1601             if (client->entry.pw_end)
1602                 *ek.key_expiration = min(*client->entry.valid_end,
1603                                          *client->entry.pw_end);
1604             else
1605                 *ek.key_expiration = *client->entry.valid_end;
1606         } else
1607             *ek.key_expiration = *client->entry.pw_end;
1608     } else
1609         ek.key_expiration = NULL;
1610     ek.flags = et.flags;
1611     ek.authtime = et.authtime;
1612     if (et.starttime) {
1613         ALLOC(ek.starttime);
1614         *ek.starttime = *et.starttime;
1615     }
1616     ek.endtime = et.endtime;
1617     if (et.renew_till) {
1618         ALLOC(ek.renew_till);
1619         *ek.renew_till = *et.renew_till;
1620     }
1621     copy_Realm(&rep.ticket.realm, &ek.srealm);
1622     copy_PrincipalName(&rep.ticket.sname, &ek.sname);
1623     if(et.caddr){
1624         ALLOC(ek.caddr);
1625         copy_HostAddresses(et.caddr, ek.caddr);
1626     }
1627
1628 #if PKINIT
1629     if (pkp) {
1630         e_text = "Failed to build PK-INIT reply";
1631         ret = _kdc_pk_mk_pa_reply(context, config, pkp, client,
1632                                   sessionetype, req, req_buffer,
1633                                   &reply_key, &et.key, rep.padata);
1634         if (ret)
1635             goto out;
1636         ret = _kdc_add_inital_verified_cas(context,
1637                                            config,
1638                                            pkp,
1639                                            &et);
1640         if (ret)
1641             goto out;
1642
1643     } else
1644 #endif
1645     {
1646         ret = krb5_generate_random_keyblock(context, sessionetype, &et.key);
1647         if (ret)
1648             goto out;
1649     }
1650
1651     if (reply_key == NULL) {
1652         e_text = "Client have no reply key";
1653         ret = KRB5KDC_ERR_CLIENT_NOTYET;
1654         goto out;
1655     }
1656
1657     ret = copy_EncryptionKey(&et.key, &ek.key);
1658     if (ret)
1659         goto out;
1660
1661     /* Add signing of alias referral */
1662     if (f.canonicalize) {
1663         PA_ClientCanonicalized canon;
1664         krb5_data data;
1665         PA_DATA pa;
1666         krb5_crypto crypto;
1667         size_t len;
1668
1669         memset(&canon, 0, sizeof(canon));
1670
1671         canon.names.requested_name = *b->cname;
1672         canon.names.mapped_name = client->entry.principal->name;
1673
1674         ASN1_MALLOC_ENCODE(PA_ClientCanonicalizedNames, data.data, data.length,
1675                            &canon.names, &len, ret);
1676         if (ret)
1677             goto out;
1678         if (data.length != len)
1679             krb5_abortx(context, "internal asn.1 error");
1680
1681         /* sign using "returned session key" */
1682         ret = krb5_crypto_init(context, &et.key, 0, &crypto);
1683         if (ret) {
1684             free(data.data);
1685             goto out;
1686         }
1687
1688         ret = krb5_create_checksum(context, crypto,
1689                                    KRB5_KU_CANONICALIZED_NAMES, 0,
1690                                    data.data, data.length,
1691                                    &canon.canon_checksum);
1692         free(data.data);
1693         krb5_crypto_destroy(context, crypto);
1694         if (ret)
1695             goto out;
1696
1697         ASN1_MALLOC_ENCODE(PA_ClientCanonicalized, data.data, data.length,
1698                            &canon, &len, ret);
1699         free_Checksum(&canon.canon_checksum);
1700         if (ret)
1701             goto out;
1702         if (data.length != len)
1703             krb5_abortx(context, "internal asn.1 error");
1704
1705         pa.padata_type = KRB5_PADATA_CLIENT_CANONICALIZED;
1706         pa.padata_value = data;
1707         ret = add_METHOD_DATA(rep.padata, &pa);
1708         free(data.data);
1709         if (ret)
1710             goto out;
1711     }
1712
1713     if (rep.padata->len == 0) {
1714         free(rep.padata);
1715         rep.padata = NULL;
1716     }
1717
1718     /* Add the PAC */
1719     if (send_pac_p(context, req)) {
1720         krb5_pac p = NULL;
1721         krb5_data data;
1722
1723         ret = _kdc_pac_generate(context, client, &p);
1724         if (ret) {
1725             kdc_log(context, config, 0, "PAC generation failed for -- %s",
1726                     client_name);
1727             goto out;
1728         }
1729         if (p != NULL) {
1730             ret = _krb5_pac_sign(context, p, et.authtime,
1731                                  client->entry.principal,
1732                                  &skey->key, /* Server key */
1733                                  &skey->key, /* FIXME: should be krbtgt key */
1734                                  &data);
1735             krb5_pac_free(context, p);
1736             if (ret) {
1737                 kdc_log(context, config, 0, "PAC signing failed for -- %s",
1738                         client_name);
1739                 goto out;
1740             }
1741
1742             ret = _kdc_tkt_add_if_relevant_ad(context, &et,
1743                                               KRB5_AUTHDATA_WIN2K_PAC,
1744                                               &data);
1745             krb5_data_free(&data);
1746             if (ret)
1747                 goto out;
1748         }
1749     }
1750
1751     _kdc_log_timestamp(context, config, "AS-REQ", et.authtime, et.starttime,
1752                        et.endtime, et.renew_till);
1753
1754     /* do this as the last thing since this signs the EncTicketPart */
1755     ret = _kdc_add_KRB5SignedPath(context,
1756                                   config,
1757                                   server,
1758                                   setype,
1759                                   client->entry.principal,
1760                                   NULL,
1761                                   NULL,
1762                                   &et);
1763     if (ret)
1764         goto out;
1765
1766     log_as_req(context, config, reply_key->keytype, setype, b);
1767
1768     ret = _kdc_encode_reply(context, config,
1769                             &rep, &et, &ek, setype, server->entry.kvno,
1770                             &skey->key, client->entry.kvno,
1771                             reply_key, 0, &e_text, reply);
1772     free_EncTicketPart(&et);
1773     free_EncKDCRepPart(&ek);
1774     if (ret)
1775         goto out;
1776
1777     /* */
1778     if (datagram_reply && reply->length > config->max_datagram_reply_length) {
1779         krb5_data_free(reply);
1780         ret = KRB5KRB_ERR_RESPONSE_TOO_BIG;
1781         e_text = "Reply packet too large";
1782     }
1783
1784 out:
1785     free_AS_REP(&rep);
1786     if(ret != 0 && ret != HDB_ERR_NOT_FOUND_HERE){
1787         krb5_mk_error(context,
1788                       ret,
1789                       e_text,
1790                       (e_data.data ? &e_data : NULL),
1791                       client_princ,
1792                       server_princ,
1793                       NULL,
1794                       NULL,
1795                       reply);
1796         ret = 0;
1797     }
1798 #ifdef PKINIT
1799     if (pkp)
1800         _kdc_pk_free_client_param(context, pkp);
1801 #endif
1802     if (e_data.data)
1803         free(e_data.data);
1804     if (client_princ)
1805         krb5_free_principal(context, client_princ);
1806     free(client_name);
1807     if (server_princ)
1808         krb5_free_principal(context, server_princ);
1809     free(server_name);
1810     if(client)
1811         _kdc_free_ent(context, client);
1812     if(server)
1813         _kdc_free_ent(context, server);
1814     return ret;
1815 }
1816
1817 /*
1818  * Add the AuthorizationData `data´ of `type´ to the last element in
1819  * the sequence of authorization_data in `tkt´ wrapped in an IF_RELEVANT
1820  */
1821
1822 krb5_error_code
1823 _kdc_tkt_add_if_relevant_ad(krb5_context context,
1824                             EncTicketPart *tkt,
1825                             int type,
1826                             const krb5_data *data)
1827 {
1828     krb5_error_code ret;
1829     size_t size;
1830
1831     if (tkt->authorization_data == NULL) {
1832         tkt->authorization_data = calloc(1, sizeof(*tkt->authorization_data));
1833         if (tkt->authorization_data == NULL) {
1834             krb5_set_error_message(context, ENOMEM, "out of memory");
1835             return ENOMEM;
1836         }
1837     }
1838
1839     /* add the entry to the last element */
1840     {
1841         AuthorizationData ad = { 0, NULL };
1842         AuthorizationDataElement ade;
1843
1844         ade.ad_type = type;
1845         ade.ad_data = *data;
1846
1847         ret = add_AuthorizationData(&ad, &ade);
1848         if (ret) {
1849             krb5_set_error_message(context, ret, "add AuthorizationData failed");
1850             return ret;
1851         }
1852
1853         ade.ad_type = KRB5_AUTHDATA_IF_RELEVANT;
1854
1855         ASN1_MALLOC_ENCODE(AuthorizationData,
1856                            ade.ad_data.data, ade.ad_data.length,
1857                            &ad, &size, ret);
1858         free_AuthorizationData(&ad);
1859         if (ret) {
1860             krb5_set_error_message(context, ret, "ASN.1 encode of "
1861                                    "AuthorizationData failed");
1862             return ret;
1863         }
1864         if (ade.ad_data.length != size)
1865             krb5_abortx(context, "internal asn.1 encoder error");
1866
1867         ret = add_AuthorizationData(tkt->authorization_data, &ade);
1868         der_free_octet_string(&ade.ad_data);
1869         if (ret) {
1870             krb5_set_error_message(context, ret, "add AuthorizationData failed");
1871             return ret;
1872         }
1873     }
1874
1875     return 0;
1876 }