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 RCSID("$Id$");
  37
  38 #define MAX_TIME ((time_t)((1U << 31) - 1))
  39
  40 void
  41 _kdc_fix_time(time_t **t)
  42 {
  43     if(*t == NULL){
  44         ALLOC(*t);
  45         **t = MAX_TIME;
  46     }
  47     if(**t == 0) **t = MAX_TIME; /* fix for old clients */
  48 }
  49
  50 static int
  51 realloc_method_data(METHOD_DATA *md)
  52 {
  53     PA_DATA *pa;
  54     pa = realloc(md->val, (md->len + 1) * sizeof(*md->val));
  55     if(pa == NULL)
  56         return ENOMEM;
  57     md->val = pa;
  58     md->len++;
  59     return 0;
  60 }
  61
  62 static void
  63 set_salt_padata (METHOD_DATA *md, Salt *salt)
  64 {
  65     if (salt) {
  66         realloc_method_data(md);
  67         md->val[md->len - 1].padata_type = salt->type;
  68         der_copy_octet_string(&salt->salt,
  69                               &md->val[md->len - 1].padata_value);
  70     }
  71 }
  72
  73 const PA_DATA*
  74 _kdc_find_padata(const KDC_REQ *req, int *start, int type)
  75 {
  76     if (req->padata == NULL)
  77         return NULL;
  78
  79     while(*start < req->padata->len){
  80         (*start)++;
  81         if(req->padata->val[*start - 1].padata_type == type)
  82             return &req->padata->val[*start - 1];
  83     }
  84     return NULL;
  85 }
  86
  87 /*
  88  * This is a hack to allow predefined weak services, like afs to
  89  * still use weak types
  90  */
  91
  92 krb5_boolean
  93 _kdc_is_weak_exception(krb5_principal principal, krb5_enctype etype)
  94 {
  95     if (principal->name.name_string.len > 0 &&
  96         strcmp(principal->name.name_string.val[0], "afs") == 0 &&
  97         (etype == ETYPE_DES_CBC_CRC
  98          || etype == ETYPE_DES_CBC_MD4
  99          || etype == ETYPE_DES_CBC_MD5))
 100         return TRUE;
 101     return FALSE;
 102 }
 103
 104
 105 /*
 106  * Detect if `key' is the using the the precomputed `default_salt'.
 107  */
 108
 109 static krb5_boolean
 110 is_default_salt_p(const krb5_salt *default_salt, const Key *key)
 111 {
 112     if (key->salt == NULL)
 113         return TRUE;
 114     if (default_salt->salttype != key->salt->type)
 115         return FALSE;
 116     if (krb5_data_cmp(&default_salt->saltvalue, &key->salt->salt))
 117         return FALSE;
 118     return TRUE;
 119 }
 120
 121 /*
 122  * return the first appropriate key of `princ' in `ret_key'.  Look for
 123  * all the etypes in (`etypes', `len'), stopping as soon as we find
 124  * one, but preferring one that has default salt
 125  */
 126
 127 krb5_error_code
 128 _kdc_find_etype(krb5_context context, const hdb_entry_ex *princ,
 129                 krb5_enctype *etypes, unsigned len,
 130                 Key **ret_key, krb5_enctype *ret_etype)
 131 {
 132     int i;
 133     krb5_error_code ret = KRB5KDC_ERR_ETYPE_NOSUPP;
 134     krb5_salt def_salt;
 135
 136     krb5_get_pw_salt (context, princ->entry.principal, &def_salt);
 137
 138     for(i = 0; ret != 0 && i < len ; i++) {
 139         Key *key = NULL;
 140
 141         if (krb5_enctype_valid(context, etypes[i]) != 0 &&
 142             !_kdc_is_weak_exception(princ->entry.principal, etypes[i]))
 143             continue;
 144
 145         while (hdb_next_enctype2key(context, &princ->entry, etypes[i], &key) == 0) {
 146             if (key->key.keyvalue.length == 0) {
 147                 ret = KRB5KDC_ERR_NULL_KEY;
 148                 continue;
 149             }
 150             *ret_key   = key;
 151             *ret_etype = etypes[i];
 152             ret = 0;
 153             if (is_default_salt_p(&def_salt, key)) {
 154                 krb5_free_salt (context, def_salt);
 155                 return ret;
 156             }
 157         }
 158     }
 159     krb5_free_salt (context, def_salt);
 160     return ret;
 161 }
 162
 163 krb5_error_code
 164 _kdc_make_anonymous_principalname (PrincipalName *pn)
 165 {
 166     pn->name_type = KRB5_NT_PRINCIPAL;
 167     pn->name_string.len = 1;
 168     pn->name_string.val = malloc(sizeof(*pn->name_string.val));
 169     if (pn->name_string.val == NULL)
 170         return ENOMEM;
 171     pn->name_string.val[0] = strdup("anonymous");
 172     if (pn->name_string.val[0] == NULL) {
 173         free(pn->name_string.val);
 174         pn->name_string.val = NULL;
 175         return ENOMEM;
 176     }
 177     return 0;
 178 }
 179
 180 void
 181 _kdc_log_timestamp(krb5_context context,
 182                    krb5_kdc_configuration *config,
 183                    const char *type,
 184                    KerberosTime authtime, KerberosTime *starttime,
 185                    KerberosTime endtime, KerberosTime *renew_till)
 186 {
 187     char authtime_str[100], starttime_str[100],
 188         endtime_str[100], renewtime_str[100];
 189
 190     krb5_format_time(context, authtime,
 191                      authtime_str, sizeof(authtime_str), TRUE);
 192     if (starttime)
 193         krb5_format_time(context, *starttime,
 194                          starttime_str, sizeof(starttime_str), TRUE);
 195     else
 196         strlcpy(starttime_str, "unset", sizeof(starttime_str));
 197     krb5_format_time(context, endtime,
 198                      endtime_str, sizeof(endtime_str), TRUE);
 199     if (renew_till)
 200         krb5_format_time(context, *renew_till,
 201                          renewtime_str, sizeof(renewtime_str), TRUE);
 202     else
 203         strlcpy(renewtime_str, "unset", sizeof(renewtime_str));
 204
 205     kdc_log(context, config, 5,
 206             "%s authtime: %s starttime: %s endtime: %s renew till: %s",
 207             type, authtime_str, starttime_str, endtime_str, renewtime_str);
 208 }
 209
 210 static void
 211 log_patypes(krb5_context context,
 212             krb5_kdc_configuration *config,
 213             METHOD_DATA *padata)
 214 {
 215     struct rk_strpool *p = NULL;
 216     char *str;
 217     int i;
 218
 219     for (i = 0; i < padata->len; i++) {
 220         switch(padata->val[i].padata_type) {
 221         case KRB5_PADATA_PK_AS_REQ:
 222             p = rk_strpoolprintf(p, "PK-INIT(ietf)");
 223             break;
 224         case KRB5_PADATA_PK_AS_REQ_WIN:
 225             p = rk_strpoolprintf(p, "PK-INIT(win2k)");
 226             break;
 227         case KRB5_PADATA_PA_PK_OCSP_RESPONSE:
 228             p = rk_strpoolprintf(p, "OCSP");
 229             break;
 230         case KRB5_PADATA_ENC_TIMESTAMP:
 231             p = rk_strpoolprintf(p, "encrypted-timestamp");
 232             break;
 233         default:
 234             p = rk_strpoolprintf(p, "%d", padata->val[i].padata_type);
 235             break;
 236         }
 237         if (p && i + 1 < padata->len)
 238             p = rk_strpoolprintf(p, ", ");
 239         if (p == NULL) {
 240             kdc_log(context, config, 0, "out of memory");
 241             return;
 242         }
 243     }
 244     if (p == NULL)
 245         p = rk_strpoolprintf(p, "none");
 246
 247     str = rk_strpoolcollect(p);
 248     kdc_log(context, config, 0, "Client sent patypes: %s", str);
 249     free(str);
 250 }
 251
 252 /*
 253  *
 254  */
 255
 256
 257 krb5_error_code
 258 _kdc_encode_reply(krb5_context context,
 259                   krb5_kdc_configuration *config,
 260                   KDC_REP *rep, const EncTicketPart *et, EncKDCRepPart *ek,
 261                   krb5_enctype etype,
 262                   int skvno, const EncryptionKey *skey,
 263                   int ckvno, const EncryptionKey *reply_key,
 264                   const char **e_text,
 265                   krb5_data *reply)
 266 {
 267     unsigned char *buf;
 268     size_t buf_size;
 269     size_t len;
 270     krb5_error_code ret;
 271     krb5_crypto crypto;
 272
 273     ASN1_MALLOC_ENCODE(EncTicketPart, buf, buf_size, et, &len, ret);
 274     if(ret) {
 275         kdc_log(context, config, 0, "Failed to encode ticket: %s",
 276                 krb5_get_err_text(context, ret));
 277         return ret;
 278     }
 279     if(buf_size != len) {
 280         free(buf);
 281         kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
 282         *e_text = "KDC internal error";
 283         return KRB5KRB_ERR_GENERIC;
 284     }
 285
 286     ret = krb5_crypto_init(context, skey, etype, &crypto);
 287     if (ret) {
 288         free(buf);
 289         kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
 290                 krb5_get_err_text(context, ret));
 291         return ret;
 292     }
 293
 294     ret = krb5_encrypt_EncryptedData(context,
 295                                      crypto,
 296                                      KRB5_KU_TICKET,
 297                                      buf,
 298                                      len,
 299                                      skvno,
 300                                      &rep->ticket.enc_part);
 301     free(buf);
 302     krb5_crypto_destroy(context, crypto);
 303     if(ret) {
 304         kdc_log(context, config, 0, "Failed to encrypt data: %s",
 305                 krb5_get_err_text(context, ret));
 306         return ret;
 307     }
 308
 309     if(rep->msg_type == krb_as_rep && !config->encode_as_rep_as_tgs_rep)
 310         ASN1_MALLOC_ENCODE(EncASRepPart, buf, buf_size, ek, &len, ret);
 311     else
 312         ASN1_MALLOC_ENCODE(EncTGSRepPart, buf, buf_size, ek, &len, ret);
 313     if(ret) {
 314         kdc_log(context, config, 0, "Failed to encode KDC-REP: %s",
 315                 krb5_get_err_text(context, ret));
 316         return ret;
 317     }
 318     if(buf_size != len) {
 319         free(buf);
 320         kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
 321         *e_text = "KDC internal error";
 322         return KRB5KRB_ERR_GENERIC;
 323     }
 324     ret = krb5_crypto_init(context, reply_key, 0, &crypto);
 325     if (ret) {
 326         free(buf);
 327         kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
 328                 krb5_get_err_text(context, ret));
 329         return ret;
 330     }
 331     if(rep->msg_type == krb_as_rep) {
 332         krb5_encrypt_EncryptedData(context,
 333                                    crypto,
 334                                    KRB5_KU_AS_REP_ENC_PART,
 335                                    buf,
 336                                    len,
 337                                    ckvno,
 338                                    &rep->enc_part);
 339         free(buf);
 340         ASN1_MALLOC_ENCODE(AS_REP, buf, buf_size, rep, &len, ret);
 341     } else {
 342         krb5_encrypt_EncryptedData(context,
 343                                    crypto,
 344                                    KRB5_KU_TGS_REP_ENC_PART_SESSION,
 345                                    buf,
 346                                    len,
 347                                    ckvno,
 348                                    &rep->enc_part);
 349         free(buf);
 350         ASN1_MALLOC_ENCODE(TGS_REP, buf, buf_size, rep, &len, ret);
 351     }
 352     krb5_crypto_destroy(context, crypto);
 353     if(ret) {
 354         kdc_log(context, config, 0, "Failed to encode KDC-REP: %s",
 355                 krb5_get_err_text(context, ret));
 356         return ret;
 357     }
 358     if(buf_size != len) {
 359         free(buf);
 360         kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
 361         *e_text = "KDC internal error";
 362         return KRB5KRB_ERR_GENERIC;
 363     }
 364     reply->data = buf;
 365     reply->length = buf_size;
 366     return 0;
 367 }
 368
 369 /*
 370  * Return 1 if the client have only older enctypes, this is for
 371  * determining if the server should send ETYPE_INFO2 or not.
 372  */
 373
 374 static int
 375 older_enctype(krb5_enctype enctype)
 376 {
 377     switch (enctype) {
 378     case ETYPE_DES_CBC_CRC:
 379     case ETYPE_DES_CBC_MD4:
 380     case ETYPE_DES_CBC_MD5:
 381     case ETYPE_DES3_CBC_SHA1:
 382     case ETYPE_ARCFOUR_HMAC_MD5:
 383     case ETYPE_ARCFOUR_HMAC_MD5_56:
 384     /*
 385      * The following three is "old" windows enctypes and is needed for
 386      * windows 2000 hosts.
 387      */
 388     case ETYPE_ARCFOUR_MD4:
 389     case ETYPE_ARCFOUR_HMAC_OLD:
 390     case ETYPE_ARCFOUR_HMAC_OLD_EXP:
 391         return 1;
 392     default:
 393         return 0;
 394     }
 395 }
 396
 397 /*
 398  *
 399  */
 400
 401 static krb5_error_code
 402 make_etype_info_entry(krb5_context context, ETYPE_INFO_ENTRY *ent, Key *key)
 403 {
 404     ent->etype = key->key.keytype;
 405     if(key->salt){
 406 #if 0
 407         ALLOC(ent->salttype);
 408
 409         if(key->salt->type == hdb_pw_salt)
 410             *ent->salttype = 0; /* or 1? or NULL? */
 411         else if(key->salt->type == hdb_afs3_salt)
 412             *ent->salttype = 2;
 413         else {
 414             kdc_log(context, config, 0, "unknown salt-type: %d",
 415                     key->salt->type);
 416             return KRB5KRB_ERR_GENERIC;
 417         }
 418         /* according to `the specs', we can't send a salt if
 419            we have AFS3 salted key, but that requires that you
 420            *know* what cell you are using (e.g by assuming
 421            that the cell is the same as the realm in lower
 422            case) */
 423 #elif 0
 424         ALLOC(ent->salttype);
 425         *ent->salttype = key->salt->type;
 426 #else
 427         /*
 428          * We shouldn't sent salttype since it is incompatible with the
 429          * specification and it breaks windows clients.  The afs
 430          * salting problem is solved by using KRB5-PADATA-AFS3-SALT
 431          * implemented in Heimdal 0.7 and later.
 432          */
 433         ent->salttype = NULL;
 434 #endif
 435         krb5_copy_data(context, &key->salt->salt,
 436                        &ent->salt);
 437     } else {
 438         /* we return no salt type at all, as that should indicate
 439          * the default salt type and make everybody happy.  some
 440          * systems (like w2k) dislike being told the salt type
 441          * here. */
 442
 443         ent->salttype = NULL;
 444         ent->salt = NULL;
 445     }
 446     return 0;
 447 }
 448
 449 static krb5_error_code
 450 get_pa_etype_info(krb5_context context,
 451                   krb5_kdc_configuration *config,
 452                   METHOD_DATA *md, Key *ckey)
 453 {
 454     krb5_error_code ret = 0;
 455     ETYPE_INFO pa;
 456     unsigned char *buf;
 457     size_t len;
 458
 459
 460     pa.len = 1;
 461     pa.val = calloc(1, sizeof(pa.val[0]));
 462     if(pa.val == NULL)
 463         return ENOMEM;
 464
 465     ret = make_etype_info_entry(context, &pa.val[0], ckey);
 466     if (ret) {
 467         free_ETYPE_INFO(&pa);
 468         return ret;
 469     }
 470
 471     ASN1_MALLOC_ENCODE(ETYPE_INFO, buf, len, &pa, &len, ret);
 472     free_ETYPE_INFO(&pa);
 473     if(ret)
 474         return ret;
 475     ret = realloc_method_data(md);
 476     if(ret) {
 477         free(buf);
 478         return ret;
 479     }
 480     md->val[md->len - 1].padata_type = KRB5_PADATA_ETYPE_INFO;
 481     md->val[md->len - 1].padata_value.length = len;
 482     md->val[md->len - 1].padata_value.data = buf;
 483     return 0;
 484 }
 485
 486 /*
 487  *
 488  */
 489
 490 extern int _krb5_AES_string_to_default_iterator;
 491
 492 static krb5_error_code
 493 make_etype_info2_entry(ETYPE_INFO2_ENTRY *ent, Key *key)
 494 {
 495     ent->etype = key->key.keytype;
 496     if(key->salt) {
 497         ALLOC(ent->salt);
 498         if (ent->salt == NULL)
 499             return ENOMEM;
 500         *ent->salt = malloc(key->salt->salt.length + 1);
 501         if (*ent->salt == NULL) {
 502             free(ent->salt);
 503             ent->salt = NULL;
 504             return ENOMEM;
 505         }
 506         memcpy(*ent->salt, key->salt->salt.data, key->salt->salt.length);
 507         (*ent->salt)[key->salt->salt.length] = '\0';
 508     } else
 509         ent->salt = NULL;
 510
 511     ent->s2kparams = NULL;
 512
 513     switch (key->key.keytype) {
 514     case ETYPE_AES128_CTS_HMAC_SHA1_96:
 515     case ETYPE_AES256_CTS_HMAC_SHA1_96:
 516         ALLOC(ent->s2kparams);
 517         if (ent->s2kparams == NULL)
 518             return ENOMEM;
 519         ent->s2kparams->length = 4;
 520         ent->s2kparams->data = malloc(ent->s2kparams->length);
 521         if (ent->s2kparams->data == NULL) {
 522             free(ent->s2kparams);
 523             ent->s2kparams = NULL;
 524             return ENOMEM;
 525         }
 526         _krb5_put_int(ent->s2kparams->data,
 527                       _krb5_AES_string_to_default_iterator,
 528                       ent->s2kparams->length);
 529         break;
 530     case ETYPE_DES_CBC_CRC:
 531     case ETYPE_DES_CBC_MD4:
 532     case ETYPE_DES_CBC_MD5:
 533         /* Check if this was a AFS3 salted key */
 534         if(key->salt && key->salt->type == hdb_afs3_salt){
 535             ALLOC(ent->s2kparams);
 536             if (ent->s2kparams == NULL)
 537                 return ENOMEM;
 538             ent->s2kparams->length = 1;
 539             ent->s2kparams->data = malloc(ent->s2kparams->length);
 540             if (ent->s2kparams->data == NULL) {
 541                 free(ent->s2kparams);
 542                 ent->s2kparams = NULL;
 543                 return ENOMEM;
 544             }
 545             _krb5_put_int(ent->s2kparams->data,
 546                           1,
 547                           ent->s2kparams->length);
 548         }
 549         break;
 550     default:
 551         break;
 552     }
 553     return 0;
 554 }
 555
 556 /*
 557  * Return an ETYPE-INFO2. Enctypes are storted the same way as in the
 558  * database (client supported enctypes first, then the unsupported
 559  * enctypes).
 560  */
 561
 562 static krb5_error_code
 563 get_pa_etype_info2(krb5_context context,
 564                    krb5_kdc_configuration *config,
 565                    METHOD_DATA *md, Key *ckey)
 566 {
 567     krb5_error_code ret = 0;
 568     ETYPE_INFO2 pa;
 569     unsigned char *buf;
 570     size_t len;
 571
 572     pa.len = 1;
 573     pa.val = calloc(1, sizeof(pa.val[0]));
 574     if(pa.val == NULL)
 575         return ENOMEM;
 576
 577     ret = make_etype_info2_entry(&pa.val[0], ckey);
 578     if (ret) {
 579         free_ETYPE_INFO2(&pa);
 580         return ret;
 581     }
 582
 583     ASN1_MALLOC_ENCODE(ETYPE_INFO2, buf, len, &pa, &len, ret);
 584     free_ETYPE_INFO2(&pa);
 585     if(ret)
 586         return ret;
 587     ret = realloc_method_data(md);
 588     if(ret) {
 589         free(buf);
 590         return ret;
 591     }
 592     md->val[md->len - 1].padata_type = KRB5_PADATA_ETYPE_INFO2;
 593     md->val[md->len - 1].padata_value.length = len;
 594     md->val[md->len - 1].padata_value.data = buf;
 595     return 0;
 596 }
 597
 598 /*
 599  *
 600  */
 601
 602 static void
 603 log_as_req(krb5_context context,
 604            krb5_kdc_configuration *config,
 605            krb5_enctype cetype,
 606            krb5_enctype setype,
 607            const KDC_REQ_BODY *b)
 608 {
 609     krb5_error_code ret;
 610     struct rk_strpool *p;
 611     char *str;
 612     int i;
 613
 614     p = rk_strpoolprintf(NULL, "%s", "Client supported enctypes: ");
 615
 616     for (i = 0; i < b->etype.len; i++) {
 617         ret = krb5_enctype_to_string(context, b->etype.val[i], &str);
 618         if (ret == 0) {
 619             p = rk_strpoolprintf(p, "%s", str);
 620             free(str);
 621         } else
 622             p = rk_strpoolprintf(p, "%d", b->etype.val[i]);
 623         if (p && i + 1 < b->etype.len)
 624             p = rk_strpoolprintf(p, ", ");
 625         if (p == NULL) {
 626             kdc_log(context, config, 0, "out of memory");
 627             return;
 628         }
 629     }
 630     if (p == NULL)
 631         p = rk_strpoolprintf(p, "no encryption types");
 632
 633     {
 634         char *cet;
 635         char *set;
 636
 637         ret = krb5_enctype_to_string(context, cetype, &cet);
 638         if(ret == 0) {
 639             ret = krb5_enctype_to_string(context, setype, &set);
 640             if (ret == 0) {
 641                 p = rk_strpoolprintf(p, ", using %s/%s", cet, set);
 642                 free(set);
 643             }
 644             free(cet);
 645         }
 646         if (ret != 0)
 647             p = rk_strpoolprintf(p, ", using enctypes %d/%d",
 648                                  cetype, setype);
 649     }
 650
 651     str = rk_strpoolcollect(p);
 652     kdc_log(context, config, 0, "%s", str);
 653     free(str);
 654
 655     {
 656         char fixedstr[128];
 657         unparse_flags(KDCOptions2int(b->kdc_options), asn1_KDCOptions_units(),
 658                       fixedstr, sizeof(fixedstr));
 659         if(*fixedstr)
 660             kdc_log(context, config, 0, "Requested flags: %s", fixedstr);
 661     }
 662 }
 663
 664 /*
 665  * verify the flags on `client' and `server', returning 0
 666  * if they are OK and generating an error messages and returning
 667  * and error code otherwise.
 668  */
 669
 670 krb5_error_code
 671 _kdc_check_flags(krb5_context context,
 672                  krb5_kdc_configuration *config,
 673                  hdb_entry_ex *client_ex, const char *client_name,
 674                  hdb_entry_ex *server_ex, const char *server_name,
 675                  krb5_boolean is_as_req)
 676 {
 677     if(client_ex != NULL) {
 678         hdb_entry *client = &client_ex->entry;
 679
 680         /* check client */
 681         if (client->flags.invalid) {
 682             kdc_log(context, config, 0,
 683                     "Client (%s) has invalid bit set", client_name);
 684             return KRB5KDC_ERR_POLICY;
 685         }
 686
 687         if(!client->flags.client){
 688             kdc_log(context, config, 0,
 689                     "Principal may not act as client -- %s", client_name);
 690             return KRB5KDC_ERR_POLICY;
 691         }
 692
 693         if (client->valid_start && *client->valid_start > kdc_time) {
 694             char starttime_str[100];
 695             krb5_format_time(context, *client->valid_start,
 696                              starttime_str, sizeof(starttime_str), TRUE);
 697             kdc_log(context, config, 0,
 698                     "Client not yet valid until %s -- %s",
 699                     starttime_str, client_name);
 700             return KRB5KDC_ERR_CLIENT_NOTYET;
 701         }
 702
 703         if (client->valid_end && *client->valid_end < kdc_time) {
 704             char endtime_str[100];
 705             krb5_format_time(context, *client->valid_end,
 706                              endtime_str, sizeof(endtime_str), TRUE);
 707             kdc_log(context, config, 0,
 708                     "Client expired at %s -- %s",
 709                     endtime_str, client_name);
 710             return KRB5KDC_ERR_NAME_EXP;
 711         }
 712
 713         if (client->pw_end && *client->pw_end < kdc_time
 714             && (server_ex == NULL || !server_ex->entry.flags.change_pw)) {
 715             char pwend_str[100];
 716             krb5_format_time(context, *client->pw_end,
 717                              pwend_str, sizeof(pwend_str), TRUE);
 718             kdc_log(context, config, 0,
 719                     "Client's key has expired at %s -- %s",
 720                     pwend_str, client_name);
 721             return KRB5KDC_ERR_KEY_EXPIRED;
 722         }
 723     }
 724
 725     /* check server */
 726
 727     if (server_ex != NULL) {
 728         hdb_entry *server = &server_ex->entry;
 729
 730         if (server->flags.invalid) {
 731             kdc_log(context, config, 0,
 732                     "Server has invalid flag set -- %s", server_name);
 733             return KRB5KDC_ERR_POLICY;
 734         }
 735
 736         if(!server->flags.server){
 737             kdc_log(context, config, 0,
 738                     "Principal may not act as server -- %s", server_name);
 739             return KRB5KDC_ERR_POLICY;
 740         }
 741
 742         if(!is_as_req && server->flags.initial) {
 743             kdc_log(context, config, 0,
 744                     "AS-REQ is required for server -- %s", server_name);
 745             return KRB5KDC_ERR_POLICY;
 746         }
 747
 748         if (server->valid_start && *server->valid_start > kdc_time) {
 749             char starttime_str[100];
 750             krb5_format_time(context, *server->valid_start,
 751                              starttime_str, sizeof(starttime_str), TRUE);
 752             kdc_log(context, config, 0,
 753                     "Server not yet valid until %s -- %s",
 754                     starttime_str, server_name);
 755             return KRB5KDC_ERR_SERVICE_NOTYET;
 756         }
 757
 758         if (server->valid_end && *server->valid_end < kdc_time) {
 759             char endtime_str[100];
 760             krb5_format_time(context, *server->valid_end,
 761                              endtime_str, sizeof(endtime_str), TRUE);
 762             kdc_log(context, config, 0,
 763                     "Server expired at %s -- %s",
 764                     endtime_str, server_name);
 765             return KRB5KDC_ERR_SERVICE_EXP;
 766         }
 767
 768         if (server->pw_end && *server->pw_end < kdc_time) {
 769             char pwend_str[100];
 770             krb5_format_time(context, *server->pw_end,
 771                              pwend_str, sizeof(pwend_str), TRUE);
 772             kdc_log(context, config, 0,
 773                     "Server's key has expired at -- %s",
 774                     pwend_str, server_name);
 775             return KRB5KDC_ERR_KEY_EXPIRED;
 776         }
 777     }
 778     return 0;
 779 }
 780
 781 /*
 782  * Return TRUE if `from' is part of `addresses' taking into consideration
 783  * the configuration variables that tells us how strict we should be about
 784  * these checks
 785  */
 786
 787 krb5_boolean
 788 _kdc_check_addresses(krb5_context context,
 789                      krb5_kdc_configuration *config,
 790                      HostAddresses *addresses, const struct sockaddr *from)
 791 {
 792     krb5_error_code ret;
 793     krb5_address addr;
 794     krb5_boolean result;
 795     krb5_boolean only_netbios = TRUE;
 796     int i;
 797
 798     if(config->check_ticket_addresses == 0)
 799         return TRUE;
 800
 801     if(addresses == NULL)
 802         return config->allow_null_ticket_addresses;
 803
 804     for (i = 0; i < addresses->len; ++i) {
 805         if (addresses->val[i].addr_type != KRB5_ADDRESS_NETBIOS) {
 806             only_netbios = FALSE;
 807         }
 808     }
 809
 810     /* Windows sends it's netbios name, which I can only assume is
 811      * used for the 'allowed workstations' check.  This is painful,
 812      * but we still want to check IP addresses if they happen to be
 813      * present.
 814      */
 815
 816     if(only_netbios)
 817         return config->allow_null_ticket_addresses;
 818
 819     ret = krb5_sockaddr2address (context, from, &addr);
 820     if(ret)
 821         return FALSE;
 822
 823     result = krb5_address_search(context, &addr, addresses);
 824     krb5_free_address (context, &addr);
 825     return result;
 826 }
 827
 828 /*
 829  *
 830  */
 831
 832 static krb5_boolean
 833 send_pac_p(krb5_context context, KDC_REQ *req)
 834 {
 835     krb5_error_code ret;
 836     PA_PAC_REQUEST pacreq;
 837     const PA_DATA *pa;
 838     int i = 0;
 839
 840     pa = _kdc_find_padata(req, &i, KRB5_PADATA_PA_PAC_REQUEST);
 841     if (pa == NULL)
 842         return TRUE;
 843
 844     ret = decode_PA_PAC_REQUEST(pa->padata_value.data,
 845                                 pa->padata_value.length,
 846                                 &pacreq,
 847                                 NULL);
 848     if (ret)
 849         return TRUE;
 850     i = pacreq.include_pac;
 851     free_PA_PAC_REQUEST(&pacreq);
 852     if (i == 0)
 853         return FALSE;
 854     return TRUE;
 855 }
 856
 857 krb5_boolean
 858 _kdc_is_anonymous(krb5_context context, krb5_principal principal)
 859 {
 860     if (principal->name.name_type != KRB5_NT_WELLKNOWN ||
 861         principal->name.name_string.len != 2 ||
 862         strcmp(principal->name.name_string.val[0], KRB5_WELLKNOWN_NAME) != 0 ||
 863         strcmp(principal->name.name_string.val[1], KRB5_ANON_NAME) != 0)
 864         return 0;
 865     return 1;
 866 }
 867
 868 /*
 869  *
 870  */
 871
 872 krb5_error_code
 873 _kdc_as_rep(krb5_context context,
 874             krb5_kdc_configuration *config,
 875             KDC_REQ *req,
 876             const krb5_data *req_buffer,
 877             krb5_data *reply,
 878             const char *from,
 879             struct sockaddr *from_addr,
 880             int datagram_reply)
 881 {
 882     KDC_REQ_BODY *b = &req->req_body;
 883     AS_REP rep;
 884     KDCOptions f = b->kdc_options;
 885     hdb_entry_ex *client = NULL, *server = NULL;
 886     krb5_enctype cetype, setype, sessionetype;
 887     krb5_data e_data;
 888     EncTicketPart et;
 889     EncKDCRepPart ek;
 890     krb5_principal client_princ = NULL, server_princ = NULL;
 891     char *client_name = NULL, *server_name = NULL;
 892     krb5_error_code ret = 0;
 893     const char *e_text = NULL;
 894     krb5_crypto crypto;
 895     Key *ckey, *skey;
 896     EncryptionKey *reply_key;
 897     int flags = 0;
 898 #ifdef PKINIT
 899     pk_client_params *pkp = NULL;
 900 #endif
 901
 902     memset(&rep, 0, sizeof(rep));
 903     krb5_data_zero(&e_data);
 904
 905     if (f.canonicalize)
 906         flags |= HDB_F_CANON;
 907
 908     if(b->sname == NULL){
 909         ret = KRB5KRB_ERR_GENERIC;
 910         e_text = "No server in request";
 911     } else{
 912         ret = _krb5_principalname2krb5_principal (context,
 913                                                   &server_princ,
 914                                                   *(b->sname),
 915                                                   b->realm);
 916         if (ret == 0)
 917             ret = krb5_unparse_name(context, server_princ, &server_name);
 918     }
 919     if (ret) {
 920         kdc_log(context, config, 0,
 921                 "AS-REQ malformed server name from %s", from);
 922         goto out;
 923     }
 924
 925     if(b->cname == NULL){
 926         ret = KRB5KRB_ERR_GENERIC;
 927         e_text = "No client in request";
 928     } else {
 929
 930         if (b->cname->name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
 931             if (b->cname->name_string.len != 1) {
 932                 kdc_log(context, config, 0,
 933                         "AS-REQ malformed canon request from %s, "
 934                         "enterprise name with %d name components",
 935                         from, b->cname->name_string.len);
 936                 ret = KRB5_PARSE_MALFORMED;
 937                 goto out;
 938             }
 939             ret = krb5_parse_name(context, b->cname->name_string.val[0],
 940                                   &client_princ);
 941             if (ret)
 942                 goto out;
 943         } else {
 944             ret = _krb5_principalname2krb5_principal (context,
 945                                                       &client_princ,
 946                                                       *(b->cname),
 947                                                       b->realm);
 948             if (ret)
 949                 goto out;
 950         }
 951
 952         ret = krb5_unparse_name(context, client_princ, &client_name);
 953     }
 954     if (ret) {
 955         kdc_log(context, config, 0,
 956                 "AS-REQ malformed client name from %s", from);
 957         goto out;
 958     }
 959
 960     kdc_log(context, config, 0, "AS-REQ %s from %s for %s",
 961             client_name, from, server_name);
 962
 963     /*
 964      *
 965      */
 966
 967     if (_kdc_is_anonymous(context, client_princ)) {
 968         if (!b->kdc_options.request_anonymous) {
 969             kdc_log(context, config, 0, "Anonymous ticket w/o anonymous flag");
 970             ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
 971             goto out;
 972         }
 973     } else if (b->kdc_options.request_anonymous) {
 974         kdc_log(context, config, 0,
 975                 "Request for a anonymous ticket with non "
 976                 "anonymous client name: %s", client_name);
 977         ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
 978         goto out;
 979     }
 980
 981     /*
 982      *
 983      */
 984
 985     ret = _kdc_db_fetch(context, config, client_princ,
 986                         HDB_F_GET_CLIENT | flags, NULL, &client);
 987     if(ret){
 988         kdc_log(context, config, 0, "UNKNOWN -- %s: %s", client_name,
 989                 krb5_get_err_text(context, ret));
 990         ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
 991         goto out;
 992     }
 993
 994     ret = _kdc_db_fetch(context, config, server_princ,
 995                         HDB_F_GET_SERVER|HDB_F_GET_KRBTGT,
 996                         NULL, &server);
 997     if(ret){
 998         kdc_log(context, config, 0, "UNKNOWN -- %s: %s", server_name,
 999                 krb5_get_err_text(context, ret));
1000         ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
1001         goto out;
1002     }
1003
1004     memset(&et, 0, sizeof(et));
1005     memset(&ek, 0, sizeof(ek));
1006
1007     /*
1008      * Find the client key for reply encryption and pa-type salt, Pick
1009      * the client key upfront before the other keys because that is
1010      * going to affect what enctypes we are going to use in
1011      * ETYPE-INFO{,2}.
1012      */
1013
1014     ret = _kdc_find_etype(context, client, b->etype.val, b->etype.len,
1015                           &ckey, &cetype);
1016     if (ret) {
1017         kdc_log(context, config, 0,
1018                 "Client (%s) has no support for etypes", client_name);
1019         goto out;
1020     }
1021
1022     /*
1023      * Pre-auth processing
1024      */
1025
1026     if(req->padata){
1027         int i;
1028         const PA_DATA *pa;
1029         int found_pa = 0;
1030
1031         log_patypes(context, config, req->padata);
1032
1033 #ifdef PKINIT
1034         kdc_log(context, config, 5,
1035                 "Looking for PKINIT pa-data -- %s", client_name);
1036
1037         e_text = "No PKINIT PA found";
1038
1039         i = 0;
1040         pa = _kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_REQ);
1041         if (pa == NULL) {
1042             i = 0;
1043             pa = _kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_REQ_WIN);
1044         }
1045         if (pa) {
1046             char *client_cert = NULL;
1047
1048             ret = _kdc_pk_rd_padata(context, config, req, pa, client, &pkp);
1049             if (ret) {
1050                 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1051                 kdc_log(context, config, 5,
1052                         "Failed to decode PKINIT PA-DATA -- %s",
1053                         client_name);
1054                 goto ts_enc;
1055             }
1056             if (ret == 0 && pkp == NULL)
1057                 goto ts_enc;
1058
1059             ret = _kdc_pk_check_client(context,
1060                                        config,
1061                                        client,
1062                                        pkp,
1063                                        &client_cert);
1064             if (ret) {
1065                 e_text = "PKINIT certificate not allowed to "
1066                     "impersonate principal";
1067                 _kdc_pk_free_client_param(context, pkp);
1068
1069                 kdc_log(context, config, 0, "%s", e_text);
1070                 pkp = NULL;
1071                 goto out;
1072             }
1073
1074             found_pa = 1;
1075             et.flags.pre_authent = 1;
1076             kdc_log(context, config, 0,
1077                     "PKINIT pre-authentication succeeded -- %s using %s",
1078                     client_name, client_cert);
1079             free(client_cert);
1080             if (pkp)
1081                 goto preauth_done;
1082         }
1083     ts_enc:
1084 #endif
1085         kdc_log(context, config, 5, "Looking for ENC-TS pa-data -- %s",
1086                 client_name);
1087
1088         i = 0;
1089         e_text = "No ENC-TS found";
1090         while((pa = _kdc_find_padata(req, &i, KRB5_PADATA_ENC_TIMESTAMP))){
1091             krb5_data ts_data;
1092             PA_ENC_TS_ENC p;
1093             size_t len;
1094             EncryptedData enc_data;
1095             Key *pa_key;
1096             char *str;
1097
1098             found_pa = 1;
1099
1100             if (b->kdc_options.request_anonymous) {
1101                 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1102                 kdc_log(context, config, 0, "ENC-TS doesn't support anon");
1103                 goto out;
1104             }
1105
1106             ret = decode_EncryptedData(pa->padata_value.data,
1107                                        pa->padata_value.length,
1108                                        &enc_data,
1109                                        &len);
1110             if (ret) {
1111                 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1112                 kdc_log(context, config, 5, "Failed to decode PA-DATA -- %s",
1113                         client_name);
1114                 goto out;
1115             }
1116
1117             ret = hdb_enctype2key(context, &client->entry,
1118                                   enc_data.etype, &pa_key);
1119             if(ret){
1120                 char *estr;
1121                 e_text = "No key matches pa-data";
1122                 ret = KRB5KDC_ERR_ETYPE_NOSUPP;
1123                 if(krb5_enctype_to_string(context, enc_data.etype, &estr))
1124                     estr = NULL;
1125                 if(estr == NULL)
1126                     kdc_log(context, config, 5,
1127                             "No client key matching pa-data (%d) -- %s",
1128                             enc_data.etype, client_name);
1129                 else
1130                     kdc_log(context, config, 5,
1131                             "No client key matching pa-data (%s) -- %s",
1132                             estr, client_name);
1133                 free(estr);
1134
1135                 free_EncryptedData(&enc_data);
1136                 continue;
1137             }
1138
1139         try_next_key:
1140             ret = krb5_crypto_init(context, &pa_key->key, 0, &crypto);
1141             if (ret) {
1142                 kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
1143                         krb5_get_err_text(context, ret));
1144                 free_EncryptedData(&enc_data);
1145                 continue;
1146             }
1147
1148             ret = krb5_decrypt_EncryptedData (context,
1149                                               crypto,
1150                                               KRB5_KU_PA_ENC_TIMESTAMP,
1151                                               &enc_data,
1152                                               &ts_data);
1153             krb5_crypto_destroy(context, crypto);
1154             /*
1155              * Since the user might have several keys with the same
1156              * enctype but with diffrent salting, we need to try all
1157              * the keys with the same enctype.
1158              */
1159             if(ret){
1160                 krb5_error_code ret2;
1161                 ret2 = krb5_enctype_to_string(context,
1162                                               pa_key->key.keytype, &str);
1163                 if (ret2)
1164                     str = NULL;
1165                 kdc_log(context, config, 5,
1166                         "Failed to decrypt PA-DATA -- %s "
1167                         "(enctype %s) error %s",
1168                         client_name,
1169                         str ? str : "unknown enctype",
1170                         krb5_get_err_text(context, ret));
1171                 free(str);
1172
1173                 if(hdb_next_enctype2key(context, &client->entry,
1174                                         enc_data.etype, &pa_key) == 0)
1175                     goto try_next_key;
1176                 e_text = "Failed to decrypt PA-DATA";
1177
1178                 free_EncryptedData(&enc_data);
1179                 ret = KRB5KDC_ERR_PREAUTH_FAILED;
1180                 continue;
1181             }
1182             free_EncryptedData(&enc_data);
1183             ret = decode_PA_ENC_TS_ENC(ts_data.data,
1184                                        ts_data.length,
1185                                        &p,
1186                                        &len);
1187             krb5_data_free(&ts_data);
1188             if(ret){
1189                 e_text = "Failed to decode PA-ENC-TS-ENC";
1190                 ret = KRB5KDC_ERR_PREAUTH_FAILED;
1191                 kdc_log(context, config,
1192                         5, "Failed to decode PA-ENC-TS_ENC -- %s",
1193                         client_name);
1194                 continue;
1195             }
1196             free_PA_ENC_TS_ENC(&p);
1197             if (abs(kdc_time - p.patimestamp) > context->max_skew) {
1198                 char client_time[100];
1199
1200                 krb5_format_time(context, p.patimestamp,
1201                                  client_time, sizeof(client_time), TRUE);
1202
1203                 ret = KRB5KRB_AP_ERR_SKEW;
1204                 kdc_log(context, config, 0,
1205                         "Too large time skew, "
1206                         "client time %s is out by %u > %u seconds -- %s",
1207                         client_time,
1208                         (unsigned)abs(kdc_time - p.patimestamp),
1209                         context->max_skew,
1210                         client_name);
1211 #if 0
1212                 /* This code is from samba, needs testing */
1213                 /*
1214                  * the following is needed to make windows clients
1215                  * to retry using the timestamp in the error message
1216                  *
1217                  * this is maybe a bug in windows to not trying when e_text
1218                  * is present...
1219                  */
1220                 e_text = NULL;
1221 #else
1222                 e_text = "Too large time skew";
1223 #endif
1224                 goto out;
1225             }
1226             et.flags.pre_authent = 1;
1227
1228             ret = krb5_enctype_to_string(context,pa_key->key.keytype, &str);
1229             if (ret)
1230                 str = NULL;
1231
1232             kdc_log(context, config, 2,
1233                     "ENC-TS Pre-authentication succeeded -- %s using %s",
1234                     client_name, str ? str : "unknown enctype");
1235             free(str);
1236             break;
1237         }
1238 #ifdef PKINIT
1239     preauth_done:
1240 #endif
1241         if(found_pa == 0 && config->require_preauth)
1242             goto use_pa;
1243         /* We come here if we found a pa-enc-timestamp, but if there
1244            was some problem with it, other than too large skew */
1245         if(found_pa && et.flags.pre_authent == 0){
1246             kdc_log(context, config, 0, "%s -- %s", e_text, client_name);
1247             e_text = NULL;
1248             goto out;
1249         }
1250     }else if (config->require_preauth
1251               || b->kdc_options.request_anonymous /* hack to force anon */
1252               || client->entry.flags.require_preauth
1253               || server->entry.flags.require_preauth) {
1254         METHOD_DATA method_data;
1255         PA_DATA *pa;
1256         unsigned char *buf;
1257         size_t len;
1258
1259     use_pa:
1260         method_data.len = 0;
1261         method_data.val = NULL;
1262
1263         ret = realloc_method_data(&method_data);
1264         if (ret) {
1265             free_METHOD_DATA(&method_data);
1266             goto out;
1267         }
1268         pa = &method_data.val[method_data.len-1];
1269         pa->padata_type         = KRB5_PADATA_ENC_TIMESTAMP;
1270         pa->padata_value.length = 0;
1271         pa->padata_value.data   = NULL;
1272
1273 #ifdef PKINIT
1274         ret = realloc_method_data(&method_data);
1275         if (ret) {
1276             free_METHOD_DATA(&method_data);
1277             goto out;
1278         }
1279         pa = &method_data.val[method_data.len-1];
1280         pa->padata_type         = KRB5_PADATA_PK_AS_REQ;
1281         pa->padata_value.length = 0;
1282         pa->padata_value.data   = NULL;
1283
1284         ret = realloc_method_data(&method_data);
1285         if (ret) {
1286             free_METHOD_DATA(&method_data);
1287             goto out;
1288         }
1289         pa = &method_data.val[method_data.len-1];
1290         pa->padata_type         = KRB5_PADATA_PK_AS_REQ_WIN;
1291         pa->padata_value.length = 0;
1292         pa->padata_value.data   = NULL;
1293 #endif
1294
1295         /*
1296          * If there is a client key, send ETYPE_INFO{,2}
1297          */
1298         if (ckey) {
1299
1300             /*
1301              * RFC4120 requires:
1302              * - If the client only knows about old enctypes, then send
1303              *   both info replies (we send 'info' first in the list).
1304              * - If the client is 'modern', because it knows about 'new'
1305              *   enctype types, then only send the 'info2' reply.
1306              *
1307              * Before we send the full list of etype-info data, we pick
1308              * the client key we would have used anyway below, just pick
1309              * that instead.
1310              */
1311
1312             if (older_enctype(ckey->key.keytype)) {
1313                 ret = get_pa_etype_info(context, config,
1314                                         &method_data, ckey);
1315                 if (ret) {
1316                     free_METHOD_DATA(&method_data);
1317                     goto out;
1318                 }
1319             }
1320             ret = get_pa_etype_info2(context, config,
1321                                      &method_data, ckey);
1322             if (ret) {
1323                 free_METHOD_DATA(&method_data);
1324                 goto out;
1325             }
1326         }
1327
1328         ASN1_MALLOC_ENCODE(METHOD_DATA, buf, len, &method_data, &len, ret);
1329         free_METHOD_DATA(&method_data);
1330
1331         e_data.data   = buf;
1332         e_data.length = len;
1333         e_text ="Need to use PA-ENC-TIMESTAMP/PA-PK-AS-REQ",
1334
1335         ret = KRB5KDC_ERR_PREAUTH_REQUIRED;
1336
1337         kdc_log(context, config, 0,
1338                 "No preauth found, returning PREAUTH-REQUIRED -- %s",
1339                 client_name);
1340         goto out;
1341     }
1342
1343     /*
1344      * Verify flags after the user been required to prove its identity
1345      * with in a preauth mech.
1346      */
1347
1348     ret = _kdc_check_flags(context, config,
1349                            client, client_name,
1350                            server, server_name,
1351                            TRUE);
1352     if(ret)
1353         goto out;
1354
1355     ret = _kdc_windc_client_access(context, client, req, &e_data);
1356     if(ret)
1357         goto out;
1358
1359     /*
1360      * Selelct the best encryption type for the KDC with out regard to
1361      * the client since the client never needs to read that data.
1362      */
1363
1364     ret = _kdc_get_preferred_key(context, config,
1365                                  server, server_name,
1366                                  &setype, &skey);
1367     if(ret)
1368         goto out;
1369
1370     /*
1371      * Select a session enctype from the list of the crypto systems
1372      * supported enctype, is supported by the client and is one of the
1373      * enctype of the enctype of the krbtgt.
1374      *
1375      * The later is used as a hint what enctype all KDC are supporting
1376      * to make sure a newer version of KDC wont generate a session
1377      * enctype that and older version of a KDC in the same realm can't
1378      * decrypt.
1379      *
1380      * But if the KDC admin is paranoid and doesn't want to have "no
1381      * the best" enctypes on the krbtgt, lets save the best pick from
1382      * the client list and hope that that will work for any other
1383      * KDCs.
1384      */
1385     {
1386         const krb5_enctype *p;
1387         krb5_enctype clientbest = ETYPE_NULL;
1388         int i, j;
1389
1390         p = krb5_kerberos_enctypes(context);
1391
1392         sessionetype = ETYPE_NULL;
1393
1394         for (i = 0; p[i] != ETYPE_NULL && sessionetype == ETYPE_NULL; i++) {
1395             if (krb5_enctype_valid(context, p[i]) != 0)
1396                 continue;
1397
1398             for (j = 0; j < b->etype.len && sessionetype == ETYPE_NULL; j++) {
1399                 Key *dummy;
1400                 /* check with client */
1401                 if (p[i] != b->etype.val[j])
1402                     continue;
1403                 /* save best of union of { client, crypto system } */
1404                 if (clientbest == ETYPE_NULL)
1405                     clientbest = p[i];
1406                 /* check with krbtgt */
1407                 ret = hdb_enctype2key(context, &server->entry, p[i], &dummy);
1408                 if (ret)
1409                     continue;
1410                 sessionetype = p[i];
1411             }
1412         }
1413         /* if krbtgt had no shared keys with client, pick clients best */
1414         if (clientbest != ETYPE_NULL && sessionetype == ETYPE_NULL) {
1415             sessionetype = clientbest;
1416         } else if (sessionetype == ETYPE_NULL) {
1417             kdc_log(context, config, 0,
1418                     "Client (%s) from %s has no common enctypes with KDC"
1419                     "to use for the session key",
1420                     client_name, from);
1421             goto out;
1422         }
1423     }
1424
1425     log_as_req(context, config, cetype, setype, b);
1426
1427     if(f.renew || f.validate || f.proxy || f.forwarded || f.enc_tkt_in_skey
1428        || (f.request_anonymous && !config->allow_anonymous)) {
1429         ret = KRB5KDC_ERR_BADOPTION;
1430         kdc_log(context, config, 0, "Bad KDC options -- %s", client_name);
1431         goto out;
1432     }
1433
1434     rep.pvno = 5;
1435     rep.msg_type = krb_as_rep;
1436
1437     ret = copy_Realm(&client->entry.principal->realm, &rep.crealm);
1438     if (ret)
1439         goto out;
1440     ret = _krb5_principal2principalname(&rep.cname, client->entry.principal);
1441     if (ret)
1442         goto out;
1443
1444     rep.ticket.tkt_vno = 5;
1445     copy_Realm(&server->entry.principal->realm, &rep.ticket.realm);
1446     _krb5_principal2principalname(&rep.ticket.sname,
1447                                   server->entry.principal);
1448     /* java 1.6 expects the name to be the same type, lets allow that
1449      * uncomplicated name-types. */
1450 #define CNT(sp,t) (((sp)->sname->name_type) == KRB5_NT_##t)
1451     if (CNT(b, UNKNOWN) || CNT(b, PRINCIPAL) || CNT(b, SRV_INST) || CNT(b, SRV_HST) || CNT(b, SRV_XHST))
1452         rep.ticket.sname.name_type = b->sname->name_type;
1453 #undef CNT
1454
1455     et.flags.initial = 1;
1456     if(client->entry.flags.forwardable && server->entry.flags.forwardable)
1457         et.flags.forwardable = f.forwardable;
1458     else if (f.forwardable) {
1459         ret = KRB5KDC_ERR_POLICY;
1460         kdc_log(context, config, 0,
1461                 "Ticket may not be forwardable -- %s", client_name);
1462         goto out;
1463     }
1464     if(client->entry.flags.proxiable && server->entry.flags.proxiable)
1465         et.flags.proxiable = f.proxiable;
1466     else if (f.proxiable) {
1467         ret = KRB5KDC_ERR_POLICY;
1468         kdc_log(context, config, 0,
1469                 "Ticket may not be proxiable -- %s", client_name);
1470         goto out;
1471     }
1472     if(client->entry.flags.postdate && server->entry.flags.postdate)
1473         et.flags.may_postdate = f.allow_postdate;
1474     else if (f.allow_postdate){
1475         ret = KRB5KDC_ERR_POLICY;
1476         kdc_log(context, config, 0,
1477                 "Ticket may not be postdatable -- %s", client_name);
1478         goto out;
1479     }
1480
1481     /* check for valid set of addresses */
1482     if(!_kdc_check_addresses(context, config, b->addresses, from_addr)) {
1483         ret = KRB5KRB_AP_ERR_BADADDR;
1484         kdc_log(context, config, 0,
1485                 "Bad address list requested -- %s", client_name);
1486         goto out;
1487     }
1488
1489     ret = copy_PrincipalName(&rep.cname, &et.cname);
1490     if (ret)
1491         goto out;
1492     ret = copy_Realm(&rep.crealm, &et.crealm);
1493     if (ret)
1494         goto out;
1495
1496     {
1497         time_t start;
1498         time_t t;
1499
1500         start = et.authtime = kdc_time;
1501
1502         if(f.postdated && req->req_body.from){
1503             ALLOC(et.starttime);
1504             start = *et.starttime = *req->req_body.from;
1505             et.flags.invalid = 1;
1506             et.flags.postdated = 1; /* XXX ??? */
1507         }
1508         _kdc_fix_time(&b->till);
1509         t = *b->till;
1510
1511         /* be careful not overflowing */
1512
1513         if(client->entry.max_life)
1514             t = start + min(t - start, *client->entry.max_life);
1515         if(server->entry.max_life)
1516             t = start + min(t - start, *server->entry.max_life);
1517 #if 0
1518         t = min(t, start + realm->max_life);
1519 #endif
1520         et.endtime = t;
1521         if(f.renewable_ok && et.endtime < *b->till){
1522             f.renewable = 1;
1523             if(b->rtime == NULL){
1524                 ALLOC(b->rtime);
1525                 *b->rtime = 0;
1526             }
1527             if(*b->rtime < *b->till)
1528                 *b->rtime = *b->till;
1529         }
1530         if(f.renewable && b->rtime){
1531             t = *b->rtime;
1532             if(t == 0)
1533                 t = MAX_TIME;
1534             if(client->entry.max_renew)
1535                 t = start + min(t - start, *client->entry.max_renew);
1536             if(server->entry.max_renew)
1537                 t = start + min(t - start, *server->entry.max_renew);
1538 #if 0
1539             t = min(t, start + realm->max_renew);
1540 #endif
1541             ALLOC(et.renew_till);
1542             *et.renew_till = t;
1543             et.flags.renewable = 1;
1544         }
1545     }
1546
1547     if (f.request_anonymous)
1548         et.flags.anonymous = 1;
1549
1550     if(b->addresses){
1551         ALLOC(et.caddr);
1552         copy_HostAddresses(b->addresses, et.caddr);
1553     }
1554
1555     et.transited.tr_type = DOMAIN_X500_COMPRESS;
1556     krb5_data_zero(&et.transited.contents);
1557
1558     /* The MIT ASN.1 library (obviously) doesn't tell lengths encoded
1559      * as 0 and as 0x80 (meaning indefinite length) apart, and is thus
1560      * incapable of correctly decoding SEQUENCE OF's of zero length.
1561      *
1562      * To fix this, always send at least one no-op last_req
1563      *
1564      * If there's a pw_end or valid_end we will use that,
1565      * otherwise just a dummy lr.
1566      */
1567     ek.last_req.val = malloc(2 * sizeof(*ek.last_req.val));
1568     if (ek.last_req.val == NULL) {
1569         ret = ENOMEM;
1570         goto out;
1571     }
1572     ek.last_req.len = 0;
1573     if (client->entry.pw_end
1574         && (config->kdc_warn_pwexpire == 0
1575             || kdc_time + config->kdc_warn_pwexpire >= *client->entry.pw_end)) {
1576         ek.last_req.val[ek.last_req.len].lr_type  = LR_PW_EXPTIME;
1577         ek.last_req.val[ek.last_req.len].lr_value = *client->entry.pw_end;
1578         ++ek.last_req.len;
1579     }
1580     if (client->entry.valid_end) {
1581         ek.last_req.val[ek.last_req.len].lr_type  = LR_ACCT_EXPTIME;
1582         ek.last_req.val[ek.last_req.len].lr_value = *client->entry.valid_end;
1583         ++ek.last_req.len;
1584     }
1585     if (ek.last_req.len == 0) {
1586         ek.last_req.val[ek.last_req.len].lr_type  = LR_NONE;
1587         ek.last_req.val[ek.last_req.len].lr_value = 0;
1588         ++ek.last_req.len;
1589     }
1590     ek.nonce = b->nonce;
1591     if (client->entry.valid_end || client->entry.pw_end) {
1592         ALLOC(ek.key_expiration);
1593         if (client->entry.valid_end) {
1594             if (client->entry.pw_end)
1595                 *ek.key_expiration = min(*client->entry.valid_end,
1596                                          *client->entry.pw_end);
1597             else
1598                 *ek.key_expiration = *client->entry.valid_end;
1599         } else
1600             *ek.key_expiration = *client->entry.pw_end;
1601     } else
1602         ek.key_expiration = NULL;
1603     ek.flags = et.flags;
1604     ek.authtime = et.authtime;
1605     if (et.starttime) {
1606         ALLOC(ek.starttime);
1607         *ek.starttime = *et.starttime;
1608     }
1609     ek.endtime = et.endtime;
1610     if (et.renew_till) {
1611         ALLOC(ek.renew_till);
1612         *ek.renew_till = *et.renew_till;
1613     }
1614     copy_Realm(&rep.ticket.realm, &ek.srealm);
1615     copy_PrincipalName(&rep.ticket.sname, &ek.sname);
1616     if(et.caddr){
1617         ALLOC(ek.caddr);
1618         copy_HostAddresses(et.caddr, ek.caddr);
1619     }
1620
1621     ALLOC(rep.padata);
1622     rep.padata->len = 0;
1623     rep.padata->val = NULL;
1624
1625 #if PKINIT
1626     if (pkp) {
1627         e_text = "Failed to build PK-INIT reply";
1628         ret = _kdc_pk_mk_pa_reply(context, config, pkp, client,
1629                                   sessionetype, req, req_buffer,
1630                                   &reply_key, &et.key, rep.padata);
1631         if (ret)
1632             goto out;
1633         ret = _kdc_add_inital_verified_cas(context,
1634                                            config,
1635                                            pkp,
1636                                            &et);
1637         if (ret)
1638             goto out;
1639     } else
1640 #endif
1641     if (ckey) {
1642         reply_key = &ckey->key;
1643         ret = krb5_generate_random_keyblock(context, sessionetype, &et.key);
1644         if (ret)
1645             goto out;
1646     } else {
1647         e_text = "Client have no reply key";
1648         ret = KRB5KDC_ERR_CLIENT_NOTYET;
1649         goto out;
1650     }
1651
1652     ret = copy_EncryptionKey(&et.key, &ek.key);
1653     if (ret)
1654         goto out;
1655
1656     if (ckey)
1657         set_salt_padata (rep.padata, ckey->salt);
1658
1659     /* Add signing of alias referral */
1660     if (f.canonicalize) {
1661         PA_ClientCanonicalized canon;
1662         krb5_data data;
1663         PA_DATA pa;
1664         krb5_crypto crypto;
1665         size_t len;
1666
1667         memset(&canon, 0, sizeof(canon));
1668
1669         canon.names.requested_name = *b->cname;
1670         canon.names.mapped_name = client->entry.principal->name;
1671
1672         ASN1_MALLOC_ENCODE(PA_ClientCanonicalizedNames, data.data, data.length,
1673                            &canon.names, &len, ret);
1674         if (ret)
1675             goto out;
1676         if (data.length != len)
1677             krb5_abortx(context, "internal asn.1 error");
1678
1679         /* sign using "returned session key" */
1680         ret = krb5_crypto_init(context, &et.key, 0, &crypto);
1681         if (ret) {
1682             free(data.data);
1683             goto out;
1684         }
1685
1686         ret = krb5_create_checksum(context, crypto,
1687                                    KRB5_KU_CANONICALIZED_NAMES, 0,
1688                                    data.data, data.length,
1689                                    &canon.canon_checksum);
1690         free(data.data);
1691         krb5_crypto_destroy(context, crypto);
1692         if (ret)
1693             goto out;
1694
1695         ASN1_MALLOC_ENCODE(PA_ClientCanonicalized, data.data, data.length,
1696                            &canon, &len, ret);
1697         free_Checksum(&canon.canon_checksum);
1698         if (ret)
1699             goto out;
1700         if (data.length != len)
1701             krb5_abortx(context, "internal asn.1 error");
1702
1703         pa.padata_type = KRB5_PADATA_CLIENT_CANONICALIZED;
1704         pa.padata_value = data;
1705         ret = add_METHOD_DATA(rep.padata, &pa);
1706         free(data.data);
1707         if (ret)
1708             goto out;
1709     }
1710
1711     if (rep.padata->len == 0) {
1712         free(rep.padata);
1713         rep.padata = NULL;
1714     }
1715
1716     /* Add the PAC */
1717     if (send_pac_p(context, req)) {
1718         krb5_pac p = NULL;
1719         krb5_data data;
1720
1721         ret = _kdc_pac_generate(context, client, &p);
1722         if (ret) {
1723             kdc_log(context, config, 0, "PAC generation failed for -- %s",
1724                     client_name);
1725             goto out;
1726         }
1727         if (p != NULL) {
1728             ret = _krb5_pac_sign(context, p, et.authtime,
1729                                  client->entry.principal,
1730                                  &skey->key, /* Server key */
1731                                  &skey->key, /* FIXME: should be krbtgt key */
1732                                  &data);
1733             krb5_pac_free(context, p);
1734             if (ret) {
1735                 kdc_log(context, config, 0, "PAC signing failed for -- %s",
1736                         client_name);
1737                 goto out;
1738             }
1739
1740             ret = _kdc_tkt_add_if_relevant_ad(context, &et,
1741                                               KRB5_AUTHDATA_WIN2K_PAC,
1742                                               &data);
1743             krb5_data_free(&data);
1744             if (ret)
1745                 goto out;
1746         }
1747     }
1748
1749     _kdc_log_timestamp(context, config, "AS-REQ", et.authtime, et.starttime,
1750                        et.endtime, et.renew_till);
1751
1752     /* do this as the last thing since this signs the EncTicketPart */
1753     ret = _kdc_add_KRB5SignedPath(context,
1754                                   config,
1755                                   server,
1756                                   setype,
1757                                   NULL,
1758                                   NULL,
1759                                   &et);
1760     if (ret)
1761         goto out;
1762
1763     ret = _kdc_encode_reply(context, config,
1764                             &rep, &et, &ek, setype, server->entry.kvno,
1765                             &skey->key, client->entry.kvno,
1766                             reply_key, &e_text, reply);
1767     free_EncTicketPart(&et);
1768     free_EncKDCRepPart(&ek);
1769     if (ret)
1770         goto out;
1771
1772     /* */
1773     if (datagram_reply && reply->length > config->max_datagram_reply_length) {
1774         krb5_data_free(reply);
1775         ret = KRB5KRB_ERR_RESPONSE_TOO_BIG;
1776         e_text = "Reply packet too large";
1777     }
1778
1779 out:
1780     free_AS_REP(&rep);
1781     if(ret){
1782         krb5_mk_error(context,
1783                       ret,
1784                       e_text,
1785                       (e_data.data ? &e_data : NULL),
1786                       client_princ,
1787                       server_princ,
1788                       NULL,
1789                       NULL,
1790                       reply);
1791         ret = 0;
1792     }
1793 #ifdef PKINIT
1794     if (pkp)
1795         _kdc_pk_free_client_param(context, pkp);
1796 #endif
1797     if (e_data.data)
1798         free(e_data.data);
1799     if (client_princ)
1800         krb5_free_principal(context, client_princ);
1801     free(client_name);
1802     if (server_princ)
1803         krb5_free_principal(context, server_princ);
1804     free(server_name);
1805     if(client)
1806         _kdc_free_ent(context, client);
1807     if(server)
1808         _kdc_free_ent(context, server);
1809     return ret;
1810 }
1811
1812 /*
1813  * Add the AuthorizationData `data´ of `type´ to the last element in
1814  * the sequence of authorization_data in `tkt´ wrapped in an IF_RELEVANT
1815  */
1816
1817 krb5_error_code
1818 _kdc_tkt_add_if_relevant_ad(krb5_context context,
1819                             EncTicketPart *tkt,
1820                             int type,
1821                             const krb5_data *data)
1822 {
1823     krb5_error_code ret;
1824     size_t size;
1825
1826     if (tkt->authorization_data == NULL) {
1827         tkt->authorization_data = calloc(1, sizeof(*tkt->authorization_data));
1828         if (tkt->authorization_data == NULL) {
1829             krb5_set_error_message(context, ENOMEM, "out of memory");
1830             return ENOMEM;
1831         }
1832     }
1833
1834     /* add the entry to the last element */
1835     {
1836         AuthorizationData ad = { 0, NULL };
1837         AuthorizationDataElement ade;
1838
1839         ade.ad_type = type;
1840         ade.ad_data = *data;
1841
1842         ret = add_AuthorizationData(&ad, &ade);
1843         if (ret) {
1844             krb5_set_error_message(context, ret, "add AuthorizationData failed");
1845             return ret;
1846         }
1847
1848         ade.ad_type = KRB5_AUTHDATA_IF_RELEVANT;
1849
1850         ASN1_MALLOC_ENCODE(AuthorizationData,
1851                            ade.ad_data.data, ade.ad_data.length,
1852                            &ad, &size, ret);
1853         free_AuthorizationData(&ad);
1854         if (ret) {
1855             krb5_set_error_message(context, ret, "ASN.1 encode of "
1856                                    "AuthorizationData failed");
1857             return ret;
1858         }
1859         if (ade.ad_data.length != size)
1860             krb5_abortx(context, "internal asn.1 encoder error");
1861
1862         ret = add_AuthorizationData(tkt->authorization_data, &ade);
1863         der_free_octet_string(&ade.ad_data);
1864         if (ret) {
1865             krb5_set_error_message(context, ret, "add AuthorizationData failed");
1866             return ret;
1867         }
1868     }
1869
1870     return 0;
1871 }