source3/libsmb/clikrb5.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    simple kerberos5 routines for active directory
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Luke Howard 2002-2003
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   7    Copyright (C) Guenther Deschner 2005-2009
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "smb_krb5.h"
  25 #include "../librpc/gen_ndr/krb5pac.h"
  26 #include "../lib/util/asn1.h"
  27 #include "libsmb/nmblib.h"
  28
  29 #ifndef KRB5_AUTHDATA_WIN2K_PAC
  30 #define KRB5_AUTHDATA_WIN2K_PAC 128
  31 #endif
  32
  33 #ifndef KRB5_AUTHDATA_IF_RELEVANT
  34 #define KRB5_AUTHDATA_IF_RELEVANT 1
  35 #endif
  36
  37 #ifdef HAVE_KRB5
  38
  39 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
  40 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
  41 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
  42                                                         bind field, flags field. */
  43
  44 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
  45    but still has the symbol */
  46 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
  47 krb5_error_code krb5_auth_con_set_req_cksumtype(
  48         krb5_context     context,
  49         krb5_auth_context      auth_context,
  50         krb5_cksumtype     cksumtype);
  51 #endif
  52
  53 /**************************************************************
  54  Wrappers around kerberos string functions that convert from
  55  utf8 -> unix charset and vica versa.
  56 **************************************************************/
  57
  58 /**************************************************************
  59  krb5_parse_name that takes a UNIX charset.
  60 **************************************************************/
  61
  62  krb5_error_code smb_krb5_parse_name(krb5_context context,
  63                                 const char *name, /* in unix charset */
  64                                 krb5_principal *principal)
  65 {
  66         krb5_error_code ret;
  67         char *utf8_name;
  68         size_t converted_size;
  69
  70         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  71                 return ENOMEM;
  72         }
  73
  74         ret = krb5_parse_name(context, utf8_name, principal);
  75         TALLOC_FREE(utf8_name);
  76         return ret;
  77 }
  78
  79 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
  80 /**************************************************************
  81  krb5_parse_name_norealm that takes a UNIX charset.
  82 **************************************************************/
  83
  84 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
  85                                 const char *name, /* in unix charset */
  86                                 krb5_principal *principal)
  87 {
  88         krb5_error_code ret;
  89         char *utf8_name;
  90         size_t converted_size;
  91
  92         *principal = NULL;
  93         if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
  94                 return ENOMEM;
  95         }
  96
  97         ret = krb5_parse_name_norealm(context, utf8_name, principal);
  98         TALLOC_FREE(utf8_name);
  99         return ret;
 100 }
 101 #endif
 102
 103 /**************************************************************
 104  krb5_parse_name that returns a UNIX charset name. Must
 105  be freed with talloc_free() call.
 106 **************************************************************/
 107
 108 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
 109                                       krb5_context context,
 110                                       krb5_const_principal principal,
 111                                       char **unix_name)
 112 {
 113         krb5_error_code ret;
 114         char *utf8_name;
 115         size_t converted_size;
 116
 117         *unix_name = NULL;
 118         ret = krb5_unparse_name(context, principal, &utf8_name);
 119         if (ret) {
 120                 return ret;
 121         }
 122
 123         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 124                 krb5_free_unparsed_name(context, utf8_name);
 125                 return ENOMEM;
 126         }
 127         krb5_free_unparsed_name(context, utf8_name);
 128         return 0;
 129 }
 130
 131 #ifndef HAVE_KRB5_SET_REAL_TIME
 132 /*
 133  * This function is not in the Heimdal mainline.
 134  */
 135  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
 136 {
 137         krb5_error_code ret;
 138         int32_t sec, usec;
 139
 140         ret = krb5_us_timeofday(context, &sec, &usec);
 141         if (ret)
 142                 return ret;
 143
 144         context->kdc_sec_offset = seconds - sec;
 145         context->kdc_usec_offset = microseconds - usec;
 146
 147         return 0;
 148 }
 149 #endif
 150
 151 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
 152
 153 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
 154
 155 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
 156  * to krb5_set_default_tgs_ktypes. See
 157  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
 158  *
 159  * If the MIT libraries are not exporting internal symbols, we will end up in
 160  * this branch, which is correct. Otherwise we will continue to use the
 161  * internal symbol
 162  */
 163  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 164 {
 165     return krb5_set_default_tgs_enctypes(ctx, enc);
 166 }
 167
 168 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
 169
 170 /* Heimdal */
 171  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
 172 {
 173         return krb5_set_default_in_tkt_etypes(ctx, enc);
 174 }
 175
 176 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
 177
 178 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
 179
 180 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
 181 /* HEIMDAL */
 182  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 183 {
 184         memset(pkaddr, '\0', sizeof(krb5_address));
 185 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 186         if (paddr->ss_family == AF_INET6) {
 187                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 188                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 189                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 190                 return true;
 191         }
 192 #endif
 193         if (paddr->ss_family == AF_INET) {
 194                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 195                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 196                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 197                 return true;
 198         }
 199         return false;
 200 }
 201 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 202 /* MIT */
 203  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 204 {
 205         memset(pkaddr, '\0', sizeof(krb5_address));
 206 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 207         if (paddr->ss_family == AF_INET6) {
 208                 pkaddr->addrtype = ADDRTYPE_INET6;
 209                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 210                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 211                 return true;
 212         }
 213 #endif
 214         if (paddr->ss_family == AF_INET) {
 215                 pkaddr->addrtype = ADDRTYPE_INET;
 216                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 217                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 218                 return true;
 219         }
 220         return false;
 221 }
 222 #else
 223 #error UNKNOWN_ADDRTYPE
 224 #endif
 225
 226 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
 227 static int create_kerberos_key_from_string_direct(krb5_context context,
 228                                                   krb5_principal host_princ,
 229                                                   krb5_data *password,
 230                                                   krb5_keyblock *key,
 231                                                   krb5_enctype enctype)
 232 {
 233         int ret = 0;
 234         krb5_data salt;
 235         krb5_encrypt_block eblock;
 236
 237         ret = krb5_principal2salt(context, host_princ, &salt);
 238         if (ret) {
 239                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 240                 return ret;
 241         }
 242         krb5_use_enctype(context, &eblock, enctype);
 243         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
 244         SAFE_FREE(salt.data);
 245
 246         return ret;
 247 }
 248 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 249 static int create_kerberos_key_from_string_direct(krb5_context context,
 250                                                   krb5_principal host_princ,
 251                                                   krb5_data *password,
 252                                                   krb5_keyblock *key,
 253                                                   krb5_enctype enctype)
 254 {
 255         int ret;
 256         krb5_salt salt;
 257
 258         ret = krb5_get_pw_salt(context, host_princ, &salt);
 259         if (ret) {
 260                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 261                 return ret;
 262         }
 263
 264         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
 265         krb5_free_salt(context, salt);
 266
 267         return ret;
 268 }
 269 #else
 270 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 271 #endif
 272
 273  int create_kerberos_key_from_string(krb5_context context,
 274                                         krb5_principal host_princ,
 275                                         krb5_data *password,
 276                                         krb5_keyblock *key,
 277                                         krb5_enctype enctype,
 278                                         bool no_salt)
 279 {
 280         krb5_principal salt_princ = NULL;
 281         int ret;
 282         /*
 283          * Check if we've determined that the KDC is salting keys for this
 284          * principal/enctype in a non-obvious way.  If it is, try to match
 285          * its behavior.
 286          */
 287         if (no_salt) {
 288                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 289                 if (!KRB5_KEY_DATA(key)) {
 290                         return ENOMEM;
 291                 }
 292                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 293                 KRB5_KEY_LENGTH(key) = password->length;
 294                 KRB5_KEY_TYPE(key) = enctype;
 295                 return 0;
 296         }
 297         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 298         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 299         if (salt_princ) {
 300                 krb5_free_principal(context, salt_princ);
 301         }
 302         return ret;
 303 }
 304
 305 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 306  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 307                                             krb5_enctype **enctypes)
 308 {
 309         return krb5_get_permitted_enctypes(context, enctypes);
 310 }
 311 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 312  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 313                                             krb5_enctype **enctypes)
 314 {
 315         return krb5_get_default_in_tkt_etypes(context, enctypes);
 316 }
 317 #else
 318 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 319 #endif
 320
 321 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 322  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 323                                         krb5_auth_context auth_context,
 324                                         krb5_keyblock *keyblock)
 325 {
 326         return krb5_auth_con_setkey(context, auth_context, keyblock);
 327 }
 328 #endif
 329
 330 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 331                            DATA_BLOB *edata,
 332                            DATA_BLOB *edata_out)
 333 {
 334         DATA_BLOB edata_contents;
 335         ASN1_DATA *data;
 336         int edata_type;
 337
 338         if (!edata->length) {
 339                 return False;
 340         }
 341
 342         data = asn1_init(mem_ctx);
 343         if (data == NULL) {
 344                 return false;
 345         }
 346
 347         asn1_load(data, *edata);
 348         asn1_start_tag(data, ASN1_SEQUENCE(0));
 349         asn1_start_tag(data, ASN1_CONTEXT(1));
 350         asn1_read_Integer(data, &edata_type);
 351
 352         if (edata_type != KRB5_PADATA_PW_SALT) {
 353                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 354                         KRB5_PADATA_PW_SALT, edata_type));
 355                 asn1_free(data);
 356                 return False;
 357         }
 358
 359         asn1_start_tag(data, ASN1_CONTEXT(2));
 360         asn1_read_OctetString(data, talloc_tos(), &edata_contents);
 361         asn1_end_tag(data);
 362         asn1_end_tag(data);
 363         asn1_end_tag(data);
 364         asn1_free(data);
 365
 366         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 367
 368         data_blob_free(&edata_contents);
 369
 370         return True;
 371 }
 372
 373
 374 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 375 {
 376         DATA_BLOB pac_contents;
 377         ASN1_DATA *data;
 378         int data_type;
 379
 380         if (!auth_data->length) {
 381                 return False;
 382         }
 383
 384         data = asn1_init(mem_ctx);
 385         if (data == NULL) {
 386                 return false;
 387         }
 388
 389         asn1_load(data, *auth_data);
 390         asn1_start_tag(data, ASN1_SEQUENCE(0));
 391         asn1_start_tag(data, ASN1_SEQUENCE(0));
 392         asn1_start_tag(data, ASN1_CONTEXT(0));
 393         asn1_read_Integer(data, &data_type);
 394
 395         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 396                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 397                 asn1_free(data);
 398                 return False;
 399         }
 400
 401         asn1_end_tag(data);
 402         asn1_start_tag(data, ASN1_CONTEXT(1));
 403         asn1_read_OctetString(data, talloc_tos(), &pac_contents);
 404         asn1_end_tag(data);
 405         asn1_end_tag(data);
 406         asn1_end_tag(data);
 407         asn1_free(data);
 408
 409         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 410
 411         data_blob_free(&pac_contents);
 412
 413         return True;
 414 }
 415
 416  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 417 {
 418         DATA_BLOB auth_data_wrapped;
 419         bool got_auth_data_pac = False;
 420         int i;
 421
 422 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 423         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 424             tkt->enc_part2->authorization_data[0] &&
 425             tkt->enc_part2->authorization_data[0]->length)
 426         {
 427                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 428
 429                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 430                             KRB5_AUTHDATA_IF_RELEVANT) {
 431                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 432                                         tkt->enc_part2->authorization_data[i]->ad_type));
 433                                 continue;
 434                         }
 435
 436                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 437                                                       tkt->enc_part2->authorization_data[i]->length);
 438
 439                         /* check if it is a PAC */
 440                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 441                         data_blob_free(&auth_data_wrapped);
 442
 443                         if (got_auth_data_pac) {
 444                                 return true;
 445                         }
 446                 }
 447
 448                 return got_auth_data_pac;
 449         }
 450
 451 #else
 452         if (tkt->ticket.authorization_data &&
 453             tkt->ticket.authorization_data->len)
 454         {
 455                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 456
 457                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 458                             KRB5_AUTHDATA_IF_RELEVANT) {
 459                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 460                                         tkt->ticket.authorization_data->val[i].ad_type));
 461                                 continue;
 462                         }
 463
 464                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 465                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 466
 467                         /* check if it is a PAC */
 468                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 469                         data_blob_free(&auth_data_wrapped);
 470
 471                         if (got_auth_data_pac) {
 472                                 return true;
 473                         }
 474                 }
 475
 476                 return got_auth_data_pac;
 477         }
 478 #endif
 479         return False;
 480 }
 481
 482  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 483 {
 484 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 485         return tkt->enc_part2->client;
 486 #else
 487         return tkt->client;
 488 #endif
 489 }
 490
 491 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 492  void krb5_free_unparsed_name(krb5_context context, char *val)
 493 {
 494         SAFE_FREE(val);
 495 }
 496 #endif
 497
 498  void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 499 {
 500 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 501         if (pdata->data) {
 502                 krb5_free_data_contents(context, pdata);
 503         }
 504 #else
 505         SAFE_FREE(pdata->data);
 506 #endif
 507 }
 508
 509  void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
 510 {
 511 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
 512         KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
 513 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
 514         KRB5_KEY_TYPE((&pcreds->session)) = enctype;
 515 #else
 516 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
 517 #endif
 518 }
 519
 520  bool kerberos_compatible_enctypes(krb5_context context,
 521                                   krb5_enctype enctype1,
 522                                   krb5_enctype enctype2)
 523 {
 524 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
 525         krb5_boolean similar = 0;
 526
 527         krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
 528         return similar ? True : False;
 529 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
 530         return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
 531 #endif
 532 }
 533
 534 static bool ads_cleanup_expired_creds(krb5_context context,
 535                                       krb5_ccache  ccache,
 536                                       krb5_creds  *credsp)
 537 {
 538         krb5_error_code retval;
 539         const char *cc_type = krb5_cc_get_type(context, ccache);
 540
 541         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 542                   cc_type, krb5_cc_get_name(context, ccache),
 543                   http_timestring(talloc_tos(), credsp->times.endtime)));
 544
 545         /* we will probably need new tickets if the current ones
 546            will expire within 10 seconds.
 547         */
 548         if (credsp->times.endtime >= (time(NULL) + 10))
 549                 return False;
 550
 551         /* heimdal won't remove creds from a file ccache, and
 552            perhaps we shouldn't anyway, since internally we
 553            use memory ccaches, and a FILE one probably means that
 554            we're using creds obtained outside of our exectuable
 555         */
 556         if (strequal(cc_type, "FILE")) {
 557                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 558                 return False;
 559         }
 560
 561         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 562         if (retval) {
 563                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 564                           error_message(retval)));
 565                 /* If we have an error in this, we want to display it,
 566                    but continue as though we deleted it */
 567         }
 568         return True;
 569 }
 570
 571 /* Allocate and setup the auth context into the state we need. */
 572
 573 static krb5_error_code setup_auth_context(krb5_context context,
 574                         krb5_auth_context *auth_context)
 575 {
 576         krb5_error_code retval;
 577
 578         retval = krb5_auth_con_init(context, auth_context );
 579         if (retval) {
 580                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 581                         error_message(retval)));
 582                 return retval;
 583         }
 584
 585         /* Ensure this is an addressless ticket. */
 586         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 587         if (retval) {
 588                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 589                         error_message(retval)));
 590         }
 591
 592         return retval;
 593 }
 594
 595 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 596                                                 uint32_t gss_flags)
 597 {
 598         unsigned int orig_length = in_data->length;
 599         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 600         char *gss_cksum = NULL;
 601
 602         if (orig_length) {
 603                 /* Extra length field for delgated ticket. */
 604                 base_cksum_size += 4;
 605         }
 606
 607         if ((unsigned int)base_cksum_size + orig_length <
 608                         (unsigned int)base_cksum_size) {
 609                 return EINVAL;
 610         }
 611
 612         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 613         if (gss_cksum == NULL) {
 614                 return ENOMEM;
 615         }
 616
 617         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 618         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 619
 620         /*
 621          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
 622          * This matches the behavior of heimdal and mit.
 623          *
 624          * And it is needed to work against some closed source
 625          * SMB servers.
 626          *
 627          * See bug #7883
 628          */
 629         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
 630
 631         SIVAL(gss_cksum, 20, gss_flags);
 632
 633         if (orig_length) {
 634                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 635                 SSVAL(gss_cksum, 26, orig_length);
 636                 /* Copy the kerberos KRB_CRED data */
 637                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 638                 free(in_data->data);
 639                 in_data->data = NULL;
 640                 in_data->length = 0;
 641         }
 642         in_data->data = gss_cksum;
 643         in_data->length = base_cksum_size + orig_length;
 644         return 0;
 645 }
 646
 647 /*
 648   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 649 */
 650 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 651                                        krb5_auth_context *auth_context,
 652                                        const krb5_flags ap_req_options,
 653                                        const char *principal,
 654                                        krb5_ccache ccache,
 655                                        krb5_data *outbuf,
 656                                        time_t *expire_time,
 657                                        const char *impersonate_princ_s)
 658 {
 659         krb5_error_code           retval;
 660         krb5_principal    server;
 661         krb5_principal impersonate_princ = NULL;
 662         krb5_creds              * credsp;
 663         krb5_creds                creds;
 664         krb5_data in_data;
 665         bool creds_ready = False;
 666         int i = 0, maxtries = 3;
 667         uint32_t gss_flags = 0;
 668
 669         ZERO_STRUCT(in_data);
 670
 671         retval = smb_krb5_parse_name(context, principal, &server);
 672         if (retval) {
 673                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 674                 return retval;
 675         }
 676
 677         if (impersonate_princ_s) {
 678                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 679                                              &impersonate_princ);
 680                 if (retval) {
 681                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 682                         goto cleanup_princ;
 683                 }
 684         }
 685
 686         /* obtain ticket & session key */
 687         ZERO_STRUCT(creds);
 688         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 689                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 690                          error_message(retval)));
 691                 goto cleanup_princ;
 692         }
 693
 694         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 695                 /* This can commonly fail on smbd startup with no ticket in the cache.
 696                  * Report at higher level than 1. */
 697                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 698                          error_message(retval)));
 699                 goto cleanup_creds;
 700         }
 701
 702         while (!creds_ready && (i < maxtries)) {
 703
 704                 if ((retval = smb_krb5_get_credentials(context, ccache,
 705                                                        creds.client,
 706                                                        creds.server,
 707                                                        impersonate_princ,
 708                                                        &credsp))) {
 709                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 710                                 principal, error_message(retval)));
 711                         goto cleanup_creds;
 712                 }
 713
 714                 /* cope with ticket being in the future due to clock skew */
 715                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 716                         time_t t = time(NULL);
 717                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 718                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 719                         krb5_set_real_time(context, t + time_offset + 1, 0);
 720                 }
 721
 722                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 723                         creds_ready = True;
 724                 }
 725
 726                 i++;
 727         }
 728
 729         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 730                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 731                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 732                   (unsigned)credsp->times.endtime));
 733
 734         if (expire_time) {
 735                 *expire_time = (time_t)credsp->times.endtime;
 736         }
 737
 738         /* Allocate the auth_context. */
 739         retval = setup_auth_context(context, auth_context);
 740         if (retval) {
 741                 DEBUG(1,("setup_auth_context failed (%s)\n",
 742                         error_message(retval)));
 743                 goto cleanup_creds;
 744         }
 745
 746 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 747         if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 748                 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 749                  as part of the kerberos exchange. */
 750
 751                 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 752
 753                 retval = krb5_auth_con_setuseruserkey(context,
 754                                         *auth_context,
 755                                         &credsp->keyblock );
 756                 if (retval) {
 757                         DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 758                                 error_message(retval)));
 759                         goto cleanup_creds;
 760                 }
 761
 762                 /* Must use a subkey for forwarded tickets. */
 763                 retval = krb5_auth_con_setflags(context,
 764                                 *auth_context,
 765                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 766                 if (retval) {
 767                         DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 768                                 error_message(retval)));
 769                         goto cleanup_creds;
 770                 }
 771
 772                 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 773                                 *auth_context,  /* Authentication context [in] */
 774                                 CONST_DISCARD(char *, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 775                                 credsp->client, /* Client principal for the tgt [in] */
 776                                 credsp->server, /* Server principal for the tgt [in] */
 777                                 ccache,         /* Credential cache to use for storage [in] */
 778                                 1,              /* Turn on for "Forwardable ticket" [in] */
 779                                 &in_data );     /* Resulting response [out] */
 780
 781                 if (retval) {
 782                         DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 783                                    error_message( retval ) ) );
 784
 785                         /*
 786                          * This is not fatal. Delete the *auth_context and continue
 787                          * with krb5_mk_req_extended to get a non-forwardable ticket.
 788                          */
 789
 790                         if (in_data.data) {
 791                                 free( in_data.data );
 792                                 in_data.data = NULL;
 793                                 in_data.length = 0;
 794                         }
 795                         krb5_auth_con_free(context, *auth_context);
 796                         *auth_context = NULL;
 797                         retval = setup_auth_context(context, auth_context);
 798                         if (retval) {
 799                                 DEBUG(1,("setup_auth_context failed (%s)\n",
 800                                         error_message(retval)));
 801                                 goto cleanup_creds;
 802                         }
 803                 } else {
 804                         /* We got a delegated ticket. */
 805                         gss_flags |= GSS_C_DELEG_FLAG;
 806                 }
 807         }
 808
 809         /* Frees and reallocates in_data into a GSS checksum blob. */
 810         retval = create_gss_checksum(&in_data, gss_flags);
 811         if (retval) {
 812                 goto cleanup_data;
 813         }
 814
 815         /* We always want GSS-checksum types. */
 816         retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 817         if (retval) {
 818                 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 819                         error_message(retval)));
 820                 goto cleanup_data;
 821         }
 822 #endif
 823
 824         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 825                                       &in_data, credsp, outbuf);
 826         if (retval) {
 827                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 828                          error_message(retval)));
 829         }
 830
 831 cleanup_data:
 832         if (in_data.data) {
 833                 free( in_data.data );
 834                 in_data.length = 0;
 835         }
 836
 837         krb5_free_creds(context, credsp);
 838
 839 cleanup_creds:
 840         krb5_free_cred_contents(context, &creds);
 841
 842 cleanup_princ:
 843         krb5_free_principal(context, server);
 844         if (impersonate_princ) {
 845                 krb5_free_principal(context, impersonate_princ);
 846         }
 847
 848         return retval;
 849 }
 850
 851 /*
 852   get a kerberos5 ticket for the given service
 853 */
 854 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 855                         const char *principal, time_t time_offset,
 856                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 857                         uint32_t extra_ap_opts, const char *ccname,
 858                         time_t *tgs_expire,
 859                         const char *impersonate_princ_s)
 860
 861 {
 862         krb5_error_code retval;
 863         krb5_data packet;
 864         krb5_context context = NULL;
 865         krb5_ccache ccdef = NULL;
 866         krb5_auth_context auth_context = NULL;
 867         krb5_enctype enc_types[] = {
 868 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
 869                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
 870 #endif
 871 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
 872                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
 873 #endif
 874                 ENCTYPE_ARCFOUR_HMAC,
 875                 ENCTYPE_DES_CBC_MD5,
 876                 ENCTYPE_DES_CBC_CRC,
 877                 ENCTYPE_NULL};
 878
 879         initialize_krb5_error_table();
 880         retval = krb5_init_context(&context);
 881         if (retval) {
 882                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 883                          error_message(retval)));
 884                 goto failed;
 885         }
 886
 887         if (time_offset != 0) {
 888                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 889         }
 890
 891         if ((retval = krb5_cc_resolve(context, ccname ?
 892                         ccname : krb5_cc_default_name(context), &ccdef))) {
 893                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 894                          error_message(retval)));
 895                 goto failed;
 896         }
 897
 898         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 899                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 900                          error_message(retval)));
 901                 goto failed;
 902         }
 903
 904         retval = ads_krb5_mk_req(context, &auth_context,
 905                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 906                                 principal, ccdef, &packet,
 907                                 tgs_expire, impersonate_princ_s);
 908         if (retval) {
 909                 goto failed;
 910         }
 911
 912         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 913                                  session_key_krb5, false);
 914
 915         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 916
 917         kerberos_free_data_contents(context, &packet);
 918
 919 failed:
 920
 921         if (context) {
 922                 if (ccdef)
 923                         krb5_cc_close(context, ccdef);
 924                 if (auth_context)
 925                         krb5_auth_con_free(context, auth_context);
 926                 krb5_free_context(context);
 927         }
 928
 929         return retval;
 930 }
 931
 932 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 933                               krb5_context context,
 934                               krb5_auth_context auth_context,
 935                               DATA_BLOB *session_key, bool remote)
 936 {
 937         krb5_keyblock *skey = NULL;
 938         krb5_error_code err = 0;
 939         bool ret = false;
 940
 941         if (remote) {
 942                 err = krb5_auth_con_getremotesubkey(context,
 943                                                     auth_context, &skey);
 944         } else {
 945                 err = krb5_auth_con_getlocalsubkey(context,
 946                                                    auth_context, &skey);
 947         }
 948
 949         if (err || skey == NULL) {
 950                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 951                 goto done;
 952         }
 953
 954         DEBUG(10, ("Got KRB5 session key of length %d\n",
 955                    (int)KRB5_KEY_LENGTH(skey)));
 956
 957         *session_key = data_blob_talloc(mem_ctx,
 958                                          KRB5_KEY_DATA(skey),
 959                                          KRB5_KEY_LENGTH(skey));
 960         dump_data_pw("KRB5 Session Key:\n",
 961                      session_key->data,
 962                      session_key->length);
 963
 964         ret = true;
 965
 966 done:
 967         if (skey) {
 968                 krb5_free_keyblock(context, skey);
 969         }
 970
 971         return ret;
 972 }
 973
 974
 975 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 976  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 977
 978  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 979 {
 980         static krb5_data kdata;
 981
 982         kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
 983         kdata.length = strlen((const char *)kdata.data);
 984         return &kdata;
 985 }
 986 #endif
 987
 988  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 989 {
 990 /* Try krb5_free_keytab_entry_contents first, since
 991  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
 992  * krb5_kt_free_entry but only has a prototype for the first, while the
 993  * second is considered private.
 994  */
 995 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 996         return krb5_free_keytab_entry_contents(context, kt_entry);
 997 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
 998         return krb5_kt_free_entry(context, kt_entry);
 999 #else
1000 #error UNKNOWN_KT_FREE_FUNCTION
1001 #endif
1002 }
1003
1004  void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1005                                      struct PAC_SIGNATURE_DATA *sig)
1006 {
1007 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1008         cksum->cksumtype        = (krb5_cksumtype)sig->type;
1009         cksum->checksum.length  = sig->signature.length;
1010         cksum->checksum.data    = sig->signature.data;
1011 #else
1012         cksum->checksum_type    = (krb5_cksumtype)sig->type;
1013         cksum->length           = sig->signature.length;
1014         cksum->contents         = sig->signature.data;
1015 #endif
1016 }
1017
1018  krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1019                                           const krb5_keyblock *keyblock,
1020                                          krb5_keyusage usage,
1021                                          krb5_checksum *cksum,
1022                                          uint8 *data,
1023                                          size_t length)
1024 {
1025         krb5_error_code ret;
1026
1027         /* verify the checksum */
1028
1029         /* welcome to the wonderful world of samba's kerberos abstraction layer:
1030          *
1031          * function                     heimdal 0.6.1rc3        heimdal 0.7     MIT krb 1.4.2
1032          * -----------------------------------------------------------------------------
1033          * krb5_c_verify_checksum       -                       works           works
1034          * krb5_verify_checksum         works (6 args)          works (6 args)  broken (7 args)
1035          */
1036
1037 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1038         {
1039                 krb5_boolean checksum_valid = False;
1040                 krb5_data input;
1041
1042                 input.data = (char *)data;
1043                 input.length = length;
1044
1045                 ret = krb5_c_verify_checksum(context,
1046                                              keyblock,
1047                                              usage,
1048                                              &input,
1049                                              cksum,
1050                                              &checksum_valid);
1051                 if (ret) {
1052                         DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1053                                 error_message(ret)));
1054                         return ret;
1055                 }
1056
1057                 if (!checksum_valid)
1058                         ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1059         }
1060
1061 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1062
1063         /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1064          * without enctype and it ignores any key_usage types - Guenther */
1065
1066         {
1067
1068                 krb5_crypto crypto;
1069                 ret = krb5_crypto_init(context,
1070                                        keyblock,
1071                                        0,
1072                                        &crypto);
1073                 if (ret) {
1074                         DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1075                                 error_message(ret)));
1076                         return ret;
1077                 }
1078
1079                 ret = krb5_verify_checksum(context,
1080                                            crypto,
1081                                            usage,
1082                                            data,
1083                                            length,
1084                                            cksum);
1085
1086                 krb5_crypto_destroy(context, crypto);
1087         }
1088
1089 #else
1090 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1091 #endif
1092
1093         return ret;
1094 }
1095
1096  time_t get_authtime_from_tkt(krb5_ticket *tkt)
1097 {
1098 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1099         return tkt->enc_part2->times.authtime;
1100 #else
1101         return tkt->ticket.authtime;
1102 #endif
1103 }
1104
1105 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
1106 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1107 {
1108 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1109         if (ap_req->ticket->enc_part.kvno)
1110                 return ap_req->ticket->enc_part.kvno;
1111 #else /* Heimdal */
1112         if (ap_req->ticket.enc_part.kvno)
1113                 return *ap_req->ticket.enc_part.kvno;
1114 #endif
1115         return 0;
1116 }
1117
1118 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1119 {
1120 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1121         return ap_req->ticket.enc_part.etype;
1122 #else /* MIT */
1123         return ap_req->ticket->enc_part.enctype;
1124 #endif
1125 }
1126 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
1127
1128 static krb5_error_code
1129 get_key_from_keytab(krb5_context context,
1130                     krb5_const_principal server,
1131                     krb5_enctype enctype,
1132                     krb5_kvno kvno,
1133                     krb5_keyblock **out_key)
1134 {
1135         krb5_keytab_entry entry;
1136         krb5_error_code ret;
1137         krb5_keytab keytab;
1138         char *name = NULL;
1139         krb5_keyblock *keyp;
1140
1141         /* We have to open a new keytab handle here, as MIT does
1142            an implicit open/getnext/close on krb5_kt_get_entry. We
1143            may be in the middle of a keytab enumeration when this is
1144            called. JRA. */
1145
1146         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1147         if (ret) {
1148                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1149                 return ret;
1150         }
1151
1152         if ( DEBUGLEVEL >= 10 ) {
1153                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1154                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1155                                 kvno, enctype, name));
1156                         TALLOC_FREE(name);
1157                 }
1158         }
1159
1160         ret = krb5_kt_get_entry(context,
1161                                 keytab,
1162                                 server,
1163                                 kvno,
1164                                 enctype,
1165                                 &entry);
1166
1167         if (ret) {
1168                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1169                 goto out;
1170         }
1171
1172         keyp = KRB5_KT_KEY(&entry);
1173
1174         ret = krb5_copy_keyblock(context, keyp, out_key);
1175         if (ret) {
1176                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1177                 goto out;
1178         }
1179
1180         smb_krb5_kt_free_entry(context, &entry);
1181
1182 out:
1183         krb5_kt_close(context, keytab);
1184         return ret;
1185 }
1186
1187 /* Prototypes */
1188
1189  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1190                                                  const krb5_data *inbuf,
1191                                                  krb5_kvno *kvno,
1192                                                  krb5_enctype *enctype)
1193 {
1194 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1195         {
1196                 krb5_error_code ret;
1197                 krb5_ap_req ap_req;
1198
1199                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1200                 if (ret)
1201                         return ret;
1202
1203                 *kvno = get_kvno_from_ap_req(&ap_req);
1204                 *enctype = get_enctype_from_ap_req(&ap_req);
1205
1206                 free_AP_REQ(&ap_req);
1207                 return 0;
1208         }
1209 #endif
1210
1211         /* Possibly not an appropriate error code. */
1212         return KRB5KDC_ERR_BADOPTION;
1213 }
1214
1215  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1216                                                         krb5_auth_context *auth_context,
1217                                                         const krb5_data *inbuf,
1218                                                         krb5_const_principal server,
1219                                                         krb5_keytab keytab,
1220                                                         krb5_flags *ap_req_options,
1221                                                         krb5_ticket **ticket,
1222                                                         krb5_keyblock **keyblock)
1223 {
1224         krb5_error_code ret;
1225         krb5_kvno kvno;
1226         krb5_enctype enctype;
1227         krb5_keyblock *local_keyblock;
1228
1229         ret = krb5_rd_req(context,
1230                           auth_context,
1231                           inbuf,
1232                           server,
1233                           keytab,
1234                           ap_req_options,
1235                           ticket);
1236         if (ret) {
1237                 return ret;
1238         }
1239
1240 #ifdef KRB5_TICKET_HAS_KEYINFO
1241         enctype = (*ticket)->enc_part.enctype;
1242         kvno = (*ticket)->enc_part.kvno;
1243 #else
1244         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1245         if (ret) {
1246                 return ret;
1247         }
1248 #endif
1249
1250         ret = get_key_from_keytab(context,
1251                                   server,
1252                                   enctype,
1253                                   kvno,
1254                                   &local_keyblock);
1255         if (ret) {
1256                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1257                 goto out;
1258         }
1259
1260 out:
1261         if (ret && local_keyblock != NULL) {
1262                 krb5_free_keyblock(context, local_keyblock);
1263         } else {
1264                 *keyblock = local_keyblock;
1265         }
1266
1267         return ret;
1268 }
1269
1270  krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1271                                             const char *name,
1272                                             krb5_principal *principal)
1273 {
1274 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1275         return smb_krb5_parse_name_norealm_conv(context, name, principal);
1276 #endif
1277
1278         /* we are cheating here because parse_name will in fact set the realm.
1279          * We don't care as the only caller of smb_krb5_parse_name_norealm
1280          * ignores the realm anyway when calling
1281          * smb_krb5_principal_compare_any_realm later - Guenther */
1282
1283         return smb_krb5_parse_name(context, name, principal);
1284 }
1285
1286  bool smb_krb5_principal_compare_any_realm(krb5_context context,
1287                                           krb5_const_principal princ1,
1288                                           krb5_const_principal princ2)
1289 {
1290 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1291
1292         return krb5_principal_compare_any_realm(context, princ1, princ2);
1293
1294 /* krb5_princ_size is a macro in MIT */
1295 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1296
1297         int i, len1, len2;
1298         const krb5_data *p1, *p2;
1299
1300         len1 = krb5_princ_size(context, princ1);
1301         len2 = krb5_princ_size(context, princ2);
1302
1303         if (len1 != len2)
1304                 return False;
1305
1306         for (i = 0; i < len1; i++) {
1307
1308                 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1309                 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1310
1311                 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1312                         return False;
1313         }
1314
1315         return True;
1316 #else
1317 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1318 #endif
1319 }
1320
1321  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
1322                                        const char *client_string,       /* gd@BER.SUSE.DE */
1323                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1324                                        time_t *expire_time)
1325 {
1326         krb5_error_code ret;
1327         krb5_context context = NULL;
1328         krb5_ccache ccache = NULL;
1329         krb5_principal client = NULL;
1330         krb5_creds creds, creds_in, *creds_out = NULL;
1331
1332         ZERO_STRUCT(creds);
1333         ZERO_STRUCT(creds_in);
1334
1335         initialize_krb5_error_table();
1336         ret = krb5_init_context(&context);
1337         if (ret) {
1338                 goto done;
1339         }
1340
1341         if (!ccache_string) {
1342                 ccache_string = krb5_cc_default_name(context);
1343         }
1344
1345         if (!ccache_string) {
1346                 ret = EINVAL;
1347                 goto done;
1348         }
1349
1350         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1351
1352         /* FIXME: we should not fall back to defaults */
1353         ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1354         if (ret) {
1355                 goto done;
1356         }
1357
1358         if (client_string) {
1359                 ret = smb_krb5_parse_name(context, client_string, &client);
1360                 if (ret) {
1361                         goto done;
1362                 }
1363         } else {
1364                 ret = krb5_cc_get_principal(context, ccache, &client);
1365                 if (ret) {
1366                         goto done;
1367                 }
1368         }
1369
1370 #ifdef HAVE_KRB5_GET_RENEWED_CREDS      /* MIT */
1371         {
1372                 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1373                 if (ret) {
1374                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1375                         goto done;
1376                 }
1377         }
1378 #elif defined(HAVE_KRB5_GET_KDC_CRED)   /* Heimdal */
1379         {
1380                 krb5_kdc_flags flags;
1381                 krb5_realm *client_realm = NULL;
1382
1383                 ret = krb5_copy_principal(context, client, &creds_in.client);
1384                 if (ret) {
1385                         goto done;
1386                 }
1387
1388                 if (service_string) {
1389                         ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1390                         if (ret) {
1391                                 goto done;
1392                         }
1393                 } else {
1394                         /* build tgt service by default */
1395                         client_realm = krb5_princ_realm(context, creds_in.client);
1396                         if (!client_realm) {
1397                                 ret = ENOMEM;
1398                                 goto done;
1399                         }
1400                         ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1401                         if (ret) {
1402                                 goto done;
1403                         }
1404                 }
1405
1406                 flags.i = 0;
1407                 flags.b.renewable = flags.b.renew = True;
1408
1409                 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1410                 if (ret) {
1411                         DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1412                         goto done;
1413                 }
1414
1415                 creds = *creds_out;
1416         }
1417 #else
1418 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1419 #endif
1420
1421         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1422         ret = krb5_cc_initialize(context, ccache, client);
1423         if (ret) {
1424                 goto done;
1425         }
1426
1427         ret = krb5_cc_store_cred(context, ccache, &creds);
1428
1429         if (expire_time) {
1430                 *expire_time = (time_t) creds.times.endtime;
1431         }
1432
1433 done:
1434         krb5_free_cred_contents(context, &creds_in);
1435
1436         if (creds_out) {
1437                 krb5_free_creds(context, creds_out);
1438         } else {
1439                 krb5_free_cred_contents(context, &creds);
1440         }
1441
1442         if (client) {
1443                 krb5_free_principal(context, client);
1444         }
1445         if (ccache) {
1446                 krb5_cc_close(context, ccache);
1447         }
1448         if (context) {
1449                 krb5_free_context(context);
1450         }
1451
1452         return ret;
1453 }
1454
1455  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1456 {
1457         krb5_error_code ret = 0;
1458         if (addr == NULL) {
1459                 return ret;
1460         }
1461 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1462         krb5_free_addresses(context, addr->addrs);
1463 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1464         ret = krb5_free_addresses(context, addr->addrs);
1465         SAFE_FREE(addr->addrs);
1466 #endif
1467         SAFE_FREE(addr);
1468         addr = NULL;
1469         return ret;
1470 }
1471
1472  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1473 {
1474         krb5_error_code ret = 0;
1475         nstring buf;
1476 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1477         krb5_address **addrs = NULL;
1478 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1479         krb5_addresses *addrs = NULL;
1480 #endif
1481
1482         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1483         if (*kerb_addr == NULL) {
1484                 return ENOMEM;
1485         }
1486
1487         put_name(buf, global_myname(), ' ', 0x20);
1488
1489 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1490         {
1491                 int num_addr = 2;
1492
1493                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1494                 if (addrs == NULL) {
1495                         SAFE_FREE(*kerb_addr);
1496                         return ENOMEM;
1497                 }
1498
1499                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1500
1501                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1502                 if (addrs[0] == NULL) {
1503                         SAFE_FREE(addrs);
1504                         SAFE_FREE(*kerb_addr);
1505                         return ENOMEM;
1506                 }
1507
1508                 addrs[0]->magic = KV5M_ADDRESS;
1509                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1510                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1511                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1512                 if (addrs[0]->contents == NULL) {
1513                         SAFE_FREE(addrs[0]);
1514                         SAFE_FREE(addrs);
1515                         SAFE_FREE(*kerb_addr);
1516                         return ENOMEM;
1517                 }
1518
1519                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1520
1521                 addrs[1] = NULL;
1522         }
1523 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1524         {
1525                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1526                 if (addrs == NULL) {
1527                         SAFE_FREE(*kerb_addr);
1528                         return ENOMEM;
1529                 }
1530
1531                 memset(addrs, 0, sizeof(krb5_addresses));
1532
1533                 addrs->len = 1;
1534                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1535                 if (addrs->val == NULL) {
1536                         SAFE_FREE(addrs);
1537                         SAFE_FREE(kerb_addr);
1538                         return ENOMEM;
1539                 }
1540
1541                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1542                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1543                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1544                 if (addrs->val[0].address.data == NULL) {
1545                         SAFE_FREE(addrs->val);
1546                         SAFE_FREE(addrs);
1547                         SAFE_FREE(*kerb_addr);
1548                         return ENOMEM;
1549                 }
1550
1551                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1552         }
1553 #else
1554 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1555 #endif
1556         (*kerb_addr)->addrs = addrs;
1557
1558         return ret;
1559 }
1560
1561  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1562 {
1563 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1564         krb5_free_error_contents(context, krberror);
1565 #else /* MIT */
1566         krb5_free_error(context, krberror);
1567 #endif
1568 }
1569
1570  krb5_error_code handle_krberror_packet(krb5_context context,
1571                                         krb5_data *packet)
1572 {
1573         krb5_error_code ret;
1574         bool got_error_code = False;
1575
1576         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1577
1578 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1579         {
1580                 krb5_error krberror;
1581
1582                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1583                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1584                                 error_message(ret)));
1585                         return ret;
1586                 }
1587
1588                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1589                         ret = (krb5_error_code) krberror.error_code;
1590                         got_error_code = True;
1591                 }
1592
1593                 smb_krb5_free_error(context, &krberror);
1594         }
1595 #else /* MIT */
1596         {
1597                 krb5_error *krberror;
1598
1599                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1600                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1601                                 error_message(ret)));
1602                         return ret;
1603                 }
1604
1605                 if (krberror->e_data.data == NULL) {
1606 #if defined(ERROR_TABLE_BASE_krb5)
1607                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1608 #else
1609                         ret = (krb5_error_code)krberror->error;
1610 #endif
1611                         got_error_code = True;
1612                 }
1613                 smb_krb5_free_error(context, krberror);
1614         }
1615 #endif
1616         if (got_error_code) {
1617                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1618                         error_message(ret), ret));
1619         }
1620         return ret;
1621 }
1622
1623  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1624                                             krb5_get_init_creds_opt **opt)
1625 {
1626 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1627         /* Heimdal or modern MIT version */
1628         return krb5_get_init_creds_opt_alloc(context, opt);
1629 #else
1630         /* Historical MIT version */
1631         krb5_get_init_creds_opt *my_opt;
1632
1633         *opt = NULL;
1634
1635         if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1636                 return ENOMEM;
1637         }
1638
1639         krb5_get_init_creds_opt_init(my_opt);
1640
1641         *opt =  my_opt;
1642         return 0;
1643 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC  */
1644 }
1645
1646  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1647                                 krb5_get_init_creds_opt *opt)
1648 {
1649 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1650
1651 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1652         /* Modern MIT or Heimdal version */
1653         krb5_get_init_creds_opt_free(context, opt);
1654 #else
1655         /* Heimdal version */
1656         krb5_get_init_creds_opt_free(opt);
1657 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1658
1659 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1660         /* Historical MIT version */
1661         SAFE_FREE(opt);
1662         opt = NULL;
1663 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1664 }
1665
1666  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1667 {
1668         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1669 }
1670
1671
1672 /* caller needs to free etype_s */
1673  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1674                                             krb5_enctype enctype,
1675                                             char **etype_s)
1676 {
1677 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1678         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1679 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1680         char buf[256];
1681         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1682         if (ret) {
1683                 return ret;
1684         }
1685         *etype_s = SMB_STRDUP(buf);
1686         if (!*etype_s) {
1687                 return ENOMEM;
1688         }
1689         return ret;
1690 #else
1691 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1692 #endif
1693 }
1694
1695  krb5_error_code smb_krb5_mk_error(krb5_context context,
1696                                 krb5_error_code error_code,
1697                                 const krb5_principal server,
1698                                 krb5_data *reply)
1699 {
1700 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1701         /*
1702          * The MIT interface is *terrible*.
1703          * We have to construct this ourselves...
1704          */
1705         krb5_error e;
1706
1707         memset(&e, 0, sizeof(e));
1708         krb5_us_timeofday(context, &e.stime, &e.susec);
1709         e.server = server;
1710 #if defined(krb5_err_base)
1711         e.error = error_code - krb5_err_base;
1712 #elif defined(ERROR_TABLE_BASE_krb5)
1713         e.error = error_code - ERROR_TABLE_BASE_krb5;
1714 #else
1715         e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1716 #endif
1717
1718         return krb5_mk_error(context, &e, reply);
1719 #else /* Heimdal. */
1720         return krb5_mk_error(context,
1721                                 error_code,
1722                                 NULL,
1723                                 NULL, /* e_data */
1724                                 NULL,
1725                                 server,
1726                                 NULL,
1727                                 NULL,
1728                                 reply);
1729 #endif
1730 }
1731
1732 /**********************************************************************
1733  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1734  * allows to process non-default keytab names.
1735  * @param context krb5_context
1736  * @param keytab_name_req string
1737  * @param write_access bool if writable keytab is required
1738  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1739  * @return krb5_error_code
1740 **********************************************************************/
1741
1742 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1743 #ifndef MAX_KEYTAB_NAME_LEN
1744 #define MAX_KEYTAB_NAME_LEN 1100
1745 #endif
1746
1747  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1748                                       const char *keytab_name_req,
1749                                       bool write_access,
1750                                       krb5_keytab *keytab)
1751 {
1752         krb5_error_code ret = 0;
1753         TALLOC_CTX *mem_ctx;
1754         char keytab_string[MAX_KEYTAB_NAME_LEN];
1755         char *kt_str = NULL;
1756         bool found_valid_name = False;
1757         const char *pragma = "FILE";
1758         const char *tmp = NULL;
1759
1760         if (!write_access && !keytab_name_req) {
1761                 /* caller just wants to read the default keytab readonly, so be it */
1762                 return krb5_kt_default(context, keytab);
1763         }
1764
1765         mem_ctx = talloc_init("smb_krb5_open_keytab");
1766         if (!mem_ctx) {
1767                 return ENOMEM;
1768         }
1769
1770 #ifdef HAVE_WRFILE_KEYTAB
1771         if (write_access) {
1772                 pragma = "WRFILE";
1773         }
1774 #endif
1775
1776         if (keytab_name_req) {
1777
1778                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1779                         ret = KRB5_CONFIG_NOTENUFSPACE;
1780                         goto out;
1781                 }
1782
1783                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1784                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1785                         tmp = keytab_name_req;
1786                         goto resolve;
1787                 }
1788
1789                 if (keytab_name_req[0] != '/') {
1790                         ret = KRB5_KT_BADNAME;
1791                         goto out;
1792                 }
1793
1794                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1795                 if (!tmp) {
1796                         ret = ENOMEM;
1797                         goto out;
1798                 }
1799
1800                 goto resolve;
1801         }
1802
1803         /* we need to handle more complex keytab_strings, like:
1804          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1805
1806         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1807         if (ret) {
1808                 goto out;
1809         }
1810
1811         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1812
1813         tmp = talloc_strdup(mem_ctx, keytab_string);
1814         if (!tmp) {
1815                 ret = ENOMEM;
1816                 goto out;
1817         }
1818
1819         if (strncmp(tmp, "ANY:", 4) == 0) {
1820                 tmp += 4;
1821         }
1822
1823         memset(&keytab_string, '\0', sizeof(keytab_string));
1824
1825         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1826                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1827                         found_valid_name = True;
1828                         tmp = kt_str;
1829                         tmp += 7;
1830                 }
1831
1832                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1833                         found_valid_name = True;
1834                         tmp = kt_str;
1835                         tmp += 5;
1836                 }
1837
1838                 if (tmp[0] == '/') {
1839                         /* Treat as a FILE: keytab definition. */
1840                         found_valid_name = true;
1841                 }
1842
1843                 if (found_valid_name) {
1844                         if (tmp[0] != '/') {
1845                                 ret = KRB5_KT_BADNAME;
1846                                 goto out;
1847                         }
1848
1849                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1850                         if (!tmp) {
1851                                 ret = ENOMEM;
1852                                 goto out;
1853                         }
1854                         break;
1855                 }
1856         }
1857
1858         if (!found_valid_name) {
1859                 ret = KRB5_KT_UNKNOWN_TYPE;
1860                 goto out;
1861         }
1862
1863  resolve:
1864         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1865         ret = krb5_kt_resolve(context, tmp, keytab);
1866
1867  out:
1868         TALLOC_FREE(mem_ctx);
1869         return ret;
1870 }
1871
1872 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1873                                      krb5_context context,
1874                                      krb5_keytab keytab,
1875                                      const char **keytab_name)
1876 {
1877         char keytab_string[MAX_KEYTAB_NAME_LEN];
1878         krb5_error_code ret = 0;
1879
1880         ret = krb5_kt_get_name(context, keytab,
1881                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1882         if (ret) {
1883                 return ret;
1884         }
1885
1886         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1887         if (!*keytab_name) {
1888                 return ENOMEM;
1889         }
1890
1891         return ret;
1892 }
1893
1894 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1895     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1896     defined(HAVE_KRB5_GET_CREDS)
1897 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1898                                                              krb5_ccache ccache,
1899                                                              krb5_principal me,
1900                                                              krb5_principal server,
1901                                                              krb5_principal impersonate_princ,
1902                                                              krb5_creds **out_creds)
1903 {
1904         krb5_error_code ret;
1905         krb5_get_creds_opt opt;
1906
1907         ret = krb5_get_creds_opt_alloc(context, &opt);
1908         if (ret) {
1909                 goto done;
1910         }
1911         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1912
1913         if (impersonate_princ) {
1914                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1915                                                          impersonate_princ);
1916                 if (ret) {
1917                         goto done;
1918                 }
1919         }
1920
1921         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1922         if (ret) {
1923                 goto done;
1924         }
1925
1926  done:
1927         if (opt) {
1928                 krb5_get_creds_opt_free(context, opt);
1929         }
1930         return ret;
1931 }
1932 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1933
1934 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1935 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1936                                                          krb5_ccache ccache,
1937                                                          krb5_principal me,
1938                                                          krb5_principal server,
1939                                                          krb5_principal impersonate_princ,
1940                                                          krb5_creds **out_creds)
1941 {
1942         krb5_error_code ret;
1943         krb5_creds in_creds;
1944
1945 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1946 krb5_error_code KRB5_CALLCONV
1947 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1948                               krb5_ccache ccache, krb5_creds *in_creds,
1949                               krb5_data *subject_cert,
1950                               krb5_creds **out_creds);
1951 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1952
1953         ZERO_STRUCT(in_creds);
1954
1955         if (impersonate_princ) {
1956
1957                 in_creds.server = me;
1958                 in_creds.client = impersonate_princ;
1959
1960                 ret = krb5_get_credentials_for_user(context,
1961                                                     0, /* krb5_flags options */
1962                                                     ccache,
1963                                                     &in_creds,
1964                                                     NULL, /* krb5_data *subject_cert */
1965                                                     out_creds);
1966         } else {
1967                 in_creds.client = me;
1968                 in_creds.server = server;
1969
1970                 ret = krb5_get_credentials(context, 0, ccache,
1971                                            &in_creds, out_creds);
1972         }
1973
1974         return ret;
1975 }
1976 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1977
1978 /*
1979  * smb_krb5_get_credentials
1980  *
1981  * @brief Get krb5 credentials for a server
1982  *
1983  * @param[in] context           An initialized krb5_context
1984  * @param[in] ccache            An initialized krb5_ccache
1985  * @param[in] me                The krb5_principal of the caller
1986  * @param[in] server            The krb5_principal of the requested service
1987  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1988  * @param[out] out_creds        The returned krb5_creds structure
1989  * @return krb5_error_code
1990  *
1991  */
1992 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1993                                          krb5_ccache ccache,
1994                                          krb5_principal me,
1995                                          krb5_principal server,
1996                                          krb5_principal impersonate_princ,
1997                                          krb5_creds **out_creds)
1998 {
1999         krb5_error_code ret;
2000         krb5_creds *creds = NULL;
2001
2002         *out_creds = NULL;
2003
2004         if (impersonate_princ) {
2005 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2006                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2007 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2008                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2009 #else
2010                 ret = ENOTSUP;
2011 #endif
2012         } else {
2013                 krb5_creds in_creds;
2014
2015                 ZERO_STRUCT(in_creds);
2016
2017                 in_creds.client = me;
2018                 in_creds.server = server;
2019
2020                 ret = krb5_get_credentials(context, 0, ccache,
2021                                            &in_creds, &creds);
2022         }
2023         if (ret) {
2024                 goto done;
2025         }
2026
2027         if (out_creds) {
2028                 *out_creds = creds;
2029         }
2030
2031  done:
2032         if (creds && ret) {
2033                 krb5_free_creds(context, creds);
2034         }
2035
2036         return ret;
2037 }
2038
2039 /*
2040  * smb_krb5_get_creds
2041  *
2042  * @brief Get krb5 credentials for a server
2043  *
2044  * @param[in] server_s          The string name of the service
2045  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
2046  * @param[in] cc                The krb5 credential cache string name (optional)
2047  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2048  * @param[out] creds_p          The returned krb5_creds structure
2049  * @return krb5_error_code
2050  *
2051  */
2052 krb5_error_code smb_krb5_get_creds(const char *server_s,
2053                                    time_t time_offset,
2054                                    const char *cc,
2055                                    const char *impersonate_princ_s,
2056                                    krb5_creds **creds_p)
2057 {
2058         krb5_error_code ret;
2059         krb5_context context = NULL;
2060         krb5_principal me = NULL;
2061         krb5_principal server = NULL;
2062         krb5_principal impersonate_princ = NULL;
2063         krb5_creds *creds = NULL;
2064         krb5_ccache ccache = NULL;
2065
2066         *creds_p = NULL;
2067
2068         initialize_krb5_error_table();
2069         ret = krb5_init_context(&context);
2070         if (ret) {
2071                 goto done;
2072         }
2073
2074         if (time_offset != 0) {
2075                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2076         }
2077
2078         ret = krb5_cc_resolve(context, cc ? cc :
2079                 krb5_cc_default_name(context), &ccache);
2080         if (ret) {
2081                 goto done;
2082         }
2083
2084         ret = krb5_cc_get_principal(context, ccache, &me);
2085         if (ret) {
2086                 goto done;
2087         }
2088
2089         ret = smb_krb5_parse_name(context, server_s, &server);
2090         if (ret) {
2091                 goto done;
2092         }
2093
2094         if (impersonate_princ_s) {
2095                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2096                                           &impersonate_princ);
2097                 if (ret) {
2098                         goto done;
2099                 }
2100         }
2101
2102         ret = smb_krb5_get_credentials(context, ccache,
2103                                        me, server, impersonate_princ,
2104                                        &creds);
2105         if (ret) {
2106                 goto done;
2107         }
2108
2109         ret = krb5_cc_store_cred(context, ccache, creds);
2110         if (ret) {
2111                 goto done;
2112         }
2113
2114         if (creds_p) {
2115                 *creds_p = creds;
2116         }
2117
2118         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2119                 server_s));
2120
2121         if (impersonate_princ_s) {
2122                 char *client = NULL;
2123
2124                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2125                 if (ret) {
2126                         goto done;
2127                 }
2128                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2129                         client));
2130                 TALLOC_FREE(client);
2131         }
2132
2133  done:
2134         if (!context) {
2135                 return ret;
2136         }
2137
2138         if (creds && ret) {
2139                 krb5_free_creds(context, creds);
2140         }
2141         if (server) {
2142                 krb5_free_principal(context, server);
2143         }
2144         if (me) {
2145                 krb5_free_principal(context, me);
2146         }
2147         if (impersonate_princ) {
2148                 krb5_free_principal(context, impersonate_princ);
2149         }
2150         if (ccache) {
2151                 krb5_cc_close(context, ccache);
2152         }
2153         krb5_free_context(context);
2154
2155         return ret;
2156 }
2157
2158 /*
2159  * smb_krb5_principal_get_realm
2160  *
2161  * @brief Get realm of a principal
2162  *
2163  * @param[in] context           The krb5_context
2164  * @param[in] principal         The principal
2165  * @return pointer to the realm
2166  *
2167  */
2168
2169 char *smb_krb5_principal_get_realm(krb5_context context,
2170                                    krb5_principal principal)
2171 {
2172 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2173         return krb5_principal_get_realm(context, principal);
2174 #elif defined(krb5_princ_realm) /* MIT */
2175         krb5_data *realm;
2176         realm = krb5_princ_realm(context, principal);
2177         return (char *)realm->data;
2178 #else
2179         return NULL;
2180 #endif
2181 }
2182
2183 #else /* HAVE_KRB5 */
2184  /* this saves a few linking headaches */
2185  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2186                         const char *principal, time_t time_offset,
2187                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2188                         uint32_t extra_ap_opts,
2189                         const char *ccname, time_t *tgs_expire,
2190                         const char *impersonate_princ_s)
2191 {
2192          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2193          return 1;
2194 }
2195
2196 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
2197 {
2198         DEBUG(0,("NO KERBEROS SUPPORT\n"));
2199         return false;
2200 }
2201
2202 #endif /* HAVE_KRB5 */