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 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
  54
  55 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
  56
  57 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
  58  * to krb5_set_default_tgs_ktypes. See
  59  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
  60  *
  61  * If the MIT libraries are not exporting internal symbols, we will end up in
  62  * this branch, which is correct. Otherwise we will continue to use the
  63  * internal symbol
  64  */
  65  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  66 {
  67     return krb5_set_default_tgs_enctypes(ctx, enc);
  68 }
  69
  70 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
  71
  72 /* Heimdal */
  73  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  74 {
  75         return krb5_set_default_in_tkt_etypes(ctx, enc);
  76 }
  77
  78 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
  79
  80 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
  81
  82 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
  83 /* HEIMDAL */
  84  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
  85 {
  86         memset(pkaddr, '\0', sizeof(krb5_address));
  87 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
  88         if (paddr->ss_family == AF_INET6) {
  89                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
  90                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
  91                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
  92                 return true;
  93         }
  94 #endif
  95         if (paddr->ss_family == AF_INET) {
  96                 pkaddr->addr_type = KRB5_ADDRESS_INET;
  97                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
  98                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
  99                 return true;
 100         }
 101         return false;
 102 }
 103 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 104 /* MIT */
 105  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 106 {
 107         memset(pkaddr, '\0', sizeof(krb5_address));
 108 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 109         if (paddr->ss_family == AF_INET6) {
 110                 pkaddr->addrtype = ADDRTYPE_INET6;
 111                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 112                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 113                 return true;
 114         }
 115 #endif
 116         if (paddr->ss_family == AF_INET) {
 117                 pkaddr->addrtype = ADDRTYPE_INET;
 118                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 119                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 120                 return true;
 121         }
 122         return false;
 123 }
 124 #else
 125 #error UNKNOWN_ADDRTYPE
 126 #endif
 127
 128  int create_kerberos_key_from_string(krb5_context context,
 129                                         krb5_principal host_princ,
 130                                         krb5_data *password,
 131                                         krb5_keyblock *key,
 132                                         krb5_enctype enctype,
 133                                         bool no_salt)
 134 {
 135         krb5_principal salt_princ = NULL;
 136         int ret;
 137         /*
 138          * Check if we've determined that the KDC is salting keys for this
 139          * principal/enctype in a non-obvious way.  If it is, try to match
 140          * its behavior.
 141          */
 142         if (no_salt) {
 143                 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
 144                 if (!KRB5_KEY_DATA(key)) {
 145                         return ENOMEM;
 146                 }
 147                 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
 148                 KRB5_KEY_LENGTH(key) = password->length;
 149                 KRB5_KEY_TYPE(key) = enctype;
 150                 return 0;
 151         }
 152         salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
 153         ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
 154         if (salt_princ) {
 155                 krb5_free_principal(context, salt_princ);
 156         }
 157         return ret;
 158 }
 159
 160 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 161  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 162                                             krb5_enctype **enctypes)
 163 {
 164         return krb5_get_permitted_enctypes(context, enctypes);
 165 }
 166 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 167  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 168                                             krb5_enctype **enctypes)
 169 {
 170 #ifdef HAVE_KRB5_PDU_NONE_DECL
 171         return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
 172 #else
 173         return krb5_get_default_in_tkt_etypes(context, enctypes);
 174 #endif
 175 }
 176 #else
 177 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 178 #endif
 179
 180 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 181  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 182                                         krb5_auth_context auth_context,
 183                                         krb5_keyblock *keyblock)
 184 {
 185         return krb5_auth_con_setkey(context, auth_context, keyblock);
 186 }
 187 #endif
 188
 189 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 190                            DATA_BLOB *edata,
 191                            DATA_BLOB *edata_out)
 192 {
 193         DATA_BLOB edata_contents;
 194         ASN1_DATA *data;
 195         int edata_type;
 196
 197         if (!edata->length) {
 198                 return False;
 199         }
 200
 201         data = asn1_init(mem_ctx);
 202         if (data == NULL) {
 203                 return false;
 204         }
 205
 206         asn1_load(data, *edata);
 207         asn1_start_tag(data, ASN1_SEQUENCE(0));
 208         asn1_start_tag(data, ASN1_CONTEXT(1));
 209         asn1_read_Integer(data, &edata_type);
 210
 211         if (edata_type != KRB5_PADATA_PW_SALT) {
 212                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 213                         KRB5_PADATA_PW_SALT, edata_type));
 214                 asn1_free(data);
 215                 return False;
 216         }
 217
 218         asn1_start_tag(data, ASN1_CONTEXT(2));
 219         asn1_read_OctetString(data, talloc_tos(), &edata_contents);
 220         asn1_end_tag(data);
 221         asn1_end_tag(data);
 222         asn1_end_tag(data);
 223         asn1_free(data);
 224
 225         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 226
 227         data_blob_free(&edata_contents);
 228
 229         return True;
 230 }
 231
 232
 233 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
 234 {
 235         DATA_BLOB pac_contents;
 236         ASN1_DATA *data;
 237         int data_type;
 238
 239         if (!auth_data->length) {
 240                 return False;
 241         }
 242
 243         data = asn1_init(mem_ctx);
 244         if (data == NULL) {
 245                 return false;
 246         }
 247
 248         asn1_load(data, *auth_data);
 249         asn1_start_tag(data, ASN1_SEQUENCE(0));
 250         asn1_start_tag(data, ASN1_SEQUENCE(0));
 251         asn1_start_tag(data, ASN1_CONTEXT(0));
 252         asn1_read_Integer(data, &data_type);
 253
 254         if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
 255                 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
 256                 asn1_free(data);
 257                 return False;
 258         }
 259
 260         asn1_end_tag(data);
 261         asn1_start_tag(data, ASN1_CONTEXT(1));
 262         asn1_read_OctetString(data, talloc_tos(), &pac_contents);
 263         asn1_end_tag(data);
 264         asn1_end_tag(data);
 265         asn1_end_tag(data);
 266         asn1_free(data);
 267
 268         *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
 269
 270         data_blob_free(&pac_contents);
 271
 272         return True;
 273 }
 274
 275  bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
 276 {
 277         DATA_BLOB auth_data_wrapped;
 278         bool got_auth_data_pac = False;
 279         int i;
 280
 281 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 282         if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
 283             tkt->enc_part2->authorization_data[0] &&
 284             tkt->enc_part2->authorization_data[0]->length)
 285         {
 286                 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
 287
 288                         if (tkt->enc_part2->authorization_data[i]->ad_type !=
 289                             KRB5_AUTHDATA_IF_RELEVANT) {
 290                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 291                                         tkt->enc_part2->authorization_data[i]->ad_type));
 292                                 continue;
 293                         }
 294
 295                         auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
 296                                                       tkt->enc_part2->authorization_data[i]->length);
 297
 298                         /* check if it is a PAC */
 299                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 300                         data_blob_free(&auth_data_wrapped);
 301
 302                         if (got_auth_data_pac) {
 303                                 return true;
 304                         }
 305                 }
 306
 307                 return got_auth_data_pac;
 308         }
 309
 310 #else
 311         if (tkt->ticket.authorization_data &&
 312             tkt->ticket.authorization_data->len)
 313         {
 314                 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
 315
 316                         if (tkt->ticket.authorization_data->val[i].ad_type !=
 317                             KRB5_AUTHDATA_IF_RELEVANT) {
 318                                 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
 319                                         tkt->ticket.authorization_data->val[i].ad_type));
 320                                 continue;
 321                         }
 322
 323                         auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
 324                                                       tkt->ticket.authorization_data->val[i].ad_data.length);
 325
 326                         /* check if it is a PAC */
 327                         got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
 328                         data_blob_free(&auth_data_wrapped);
 329
 330                         if (got_auth_data_pac) {
 331                                 return true;
 332                         }
 333                 }
 334
 335                 return got_auth_data_pac;
 336         }
 337 #endif
 338         return False;
 339 }
 340
 341  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 342 {
 343 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 344         return tkt->enc_part2->client;
 345 #else
 346         return tkt->client;
 347 #endif
 348 }
 349
 350 static bool ads_cleanup_expired_creds(krb5_context context,
 351                                       krb5_ccache  ccache,
 352                                       krb5_creds  *credsp)
 353 {
 354         krb5_error_code retval;
 355         const char *cc_type = krb5_cc_get_type(context, ccache);
 356
 357         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 358                   cc_type, krb5_cc_get_name(context, ccache),
 359                   http_timestring(talloc_tos(), credsp->times.endtime)));
 360
 361         /* we will probably need new tickets if the current ones
 362            will expire within 10 seconds.
 363         */
 364         if (credsp->times.endtime >= (time(NULL) + 10))
 365                 return False;
 366
 367         /* heimdal won't remove creds from a file ccache, and
 368            perhaps we shouldn't anyway, since internally we
 369            use memory ccaches, and a FILE one probably means that
 370            we're using creds obtained outside of our exectuable
 371         */
 372         if (strequal(cc_type, "FILE")) {
 373                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 374                 return False;
 375         }
 376
 377         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 378         if (retval) {
 379                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 380                           error_message(retval)));
 381                 /* If we have an error in this, we want to display it,
 382                    but continue as though we deleted it */
 383         }
 384         return True;
 385 }
 386
 387 /* Allocate and setup the auth context into the state we need. */
 388
 389 static krb5_error_code setup_auth_context(krb5_context context,
 390                         krb5_auth_context *auth_context)
 391 {
 392         krb5_error_code retval;
 393
 394         retval = krb5_auth_con_init(context, auth_context );
 395         if (retval) {
 396                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 397                         error_message(retval)));
 398                 return retval;
 399         }
 400
 401         /* Ensure this is an addressless ticket. */
 402         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 403         if (retval) {
 404                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 405                         error_message(retval)));
 406         }
 407
 408         return retval;
 409 }
 410
 411 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 412 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 413                                                 uint32_t gss_flags)
 414 {
 415         unsigned int orig_length = in_data->length;
 416         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 417         char *gss_cksum = NULL;
 418
 419         if (orig_length) {
 420                 /* Extra length field for delgated ticket. */
 421                 base_cksum_size += 4;
 422         }
 423
 424         if ((unsigned int)base_cksum_size + orig_length <
 425                         (unsigned int)base_cksum_size) {
 426                 return EINVAL;
 427         }
 428
 429         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 430         if (gss_cksum == NULL) {
 431                 return ENOMEM;
 432         }
 433
 434         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 435         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 436
 437         /*
 438          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
 439          * This matches the behavior of heimdal and mit.
 440          *
 441          * And it is needed to work against some closed source
 442          * SMB servers.
 443          *
 444          * See bug #7883
 445          */
 446         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
 447
 448         SIVAL(gss_cksum, 20, gss_flags);
 449
 450         if (orig_length) {
 451                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 452                 SSVAL(gss_cksum, 26, orig_length);
 453                 /* Copy the kerberos KRB_CRED data */
 454                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 455                 free(in_data->data);
 456                 in_data->data = NULL;
 457                 in_data->length = 0;
 458         }
 459         in_data->data = gss_cksum;
 460         in_data->length = base_cksum_size + orig_length;
 461         return 0;
 462 }
 463 #endif
 464
 465 /*
 466   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 467 */
 468 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 469                                        krb5_auth_context *auth_context,
 470                                        const krb5_flags ap_req_options,
 471                                        const char *principal,
 472                                        krb5_ccache ccache,
 473                                        krb5_data *outbuf,
 474                                        time_t *expire_time,
 475                                        const char *impersonate_princ_s)
 476 {
 477         krb5_error_code           retval;
 478         krb5_principal    server;
 479         krb5_principal impersonate_princ = NULL;
 480         krb5_creds              * credsp;
 481         krb5_creds                creds;
 482         krb5_data in_data;
 483         bool creds_ready = False;
 484         int i = 0, maxtries = 3;
 485
 486         ZERO_STRUCT(in_data);
 487
 488         retval = smb_krb5_parse_name(context, principal, &server);
 489         if (retval) {
 490                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 491                 return retval;
 492         }
 493
 494         if (impersonate_princ_s) {
 495                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 496                                              &impersonate_princ);
 497                 if (retval) {
 498                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 499                         goto cleanup_princ;
 500                 }
 501         }
 502
 503         /* obtain ticket & session key */
 504         ZERO_STRUCT(creds);
 505         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 506                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 507                          error_message(retval)));
 508                 goto cleanup_princ;
 509         }
 510
 511         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 512                 /* This can commonly fail on smbd startup with no ticket in the cache.
 513                  * Report at higher level than 1. */
 514                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 515                          error_message(retval)));
 516                 goto cleanup_creds;
 517         }
 518
 519         while (!creds_ready && (i < maxtries)) {
 520
 521                 if ((retval = smb_krb5_get_credentials(context, ccache,
 522                                                        creds.client,
 523                                                        creds.server,
 524                                                        impersonate_princ,
 525                                                        &credsp))) {
 526                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 527                                 principal, error_message(retval)));
 528                         goto cleanup_creds;
 529                 }
 530
 531                 /* cope with ticket being in the future due to clock skew */
 532                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 533                         time_t t = time(NULL);
 534                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 535                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 536                         krb5_set_real_time(context, t + time_offset + 1, 0);
 537                 }
 538
 539                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 540                         creds_ready = True;
 541                 }
 542
 543                 i++;
 544         }
 545
 546         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 547                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 548                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 549                   (unsigned)credsp->times.endtime));
 550
 551         if (expire_time) {
 552                 *expire_time = (time_t)credsp->times.endtime;
 553         }
 554
 555         /* Allocate the auth_context. */
 556         retval = setup_auth_context(context, auth_context);
 557         if (retval) {
 558                 DEBUG(1,("setup_auth_context failed (%s)\n",
 559                         error_message(retval)));
 560                 goto cleanup_creds;
 561         }
 562
 563 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 564         {
 565                 uint32_t gss_flags = 0;
 566
 567                 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 568                         /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 569                          as part of the kerberos exchange. */
 570
 571                         DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 572
 573                         retval = krb5_auth_con_setuseruserkey(context,
 574                                         *auth_context,
 575                                         &credsp->keyblock );
 576                         if (retval) {
 577                                 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 578                                         error_message(retval)));
 579                                 goto cleanup_creds;
 580                         }
 581
 582                         /* Must use a subkey for forwarded tickets. */
 583                         retval = krb5_auth_con_setflags(context,
 584                                 *auth_context,
 585                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 586                         if (retval) {
 587                                 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 588                                         error_message(retval)));
 589                                 goto cleanup_creds;
 590                         }
 591
 592                         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 593                                 *auth_context,  /* Authentication context [in] */
 594                                 discard_const_p(char, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 595                                 credsp->client, /* Client principal for the tgt [in] */
 596                                 credsp->server, /* Server principal for the tgt [in] */
 597                                 ccache,         /* Credential cache to use for storage [in] */
 598                                 1,              /* Turn on for "Forwardable ticket" [in] */
 599                                 &in_data );     /* Resulting response [out] */
 600
 601                         if (retval) {
 602                                 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 603                                            error_message( retval ) ) );
 604
 605                                 /*
 606                                  * This is not fatal. Delete the *auth_context and continue
 607                                  * with krb5_mk_req_extended to get a non-forwardable ticket.
 608                                  */
 609
 610                                 if (in_data.data) {
 611                                         free( in_data.data );
 612                                         in_data.data = NULL;
 613                                         in_data.length = 0;
 614                                 }
 615                                 krb5_auth_con_free(context, *auth_context);
 616                                 *auth_context = NULL;
 617                                 retval = setup_auth_context(context, auth_context);
 618                                 if (retval) {
 619                                         DEBUG(1,("setup_auth_context failed (%s)\n",
 620                                                 error_message(retval)));
 621                                         goto cleanup_creds;
 622                                 }
 623                         } else {
 624                                 /* We got a delegated ticket. */
 625                                 gss_flags |= GSS_C_DELEG_FLAG;
 626                         }
 627                 }
 628
 629                 /* Frees and reallocates in_data into a GSS checksum blob. */
 630                 retval = create_gss_checksum(&in_data, gss_flags);
 631                 if (retval) {
 632                         goto cleanup_data;
 633                 }
 634
 635                 /* We always want GSS-checksum types. */
 636                 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 637                 if (retval) {
 638                         DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 639                                 error_message(retval)));
 640                         goto cleanup_data;
 641                 }
 642         }
 643 #endif
 644
 645         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 646                                       &in_data, credsp, outbuf);
 647         if (retval) {
 648                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 649                          error_message(retval)));
 650         }
 651
 652 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
 653 cleanup_data:
 654 #endif
 655
 656         if (in_data.data) {
 657                 free( in_data.data );
 658                 in_data.length = 0;
 659         }
 660
 661         krb5_free_creds(context, credsp);
 662
 663 cleanup_creds:
 664         krb5_free_cred_contents(context, &creds);
 665
 666 cleanup_princ:
 667         krb5_free_principal(context, server);
 668         if (impersonate_princ) {
 669                 krb5_free_principal(context, impersonate_princ);
 670         }
 671
 672         return retval;
 673 }
 674
 675 /*
 676   get a kerberos5 ticket for the given service
 677 */
 678 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 679                         const char *principal, time_t time_offset,
 680                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 681                         uint32_t extra_ap_opts, const char *ccname,
 682                         time_t *tgs_expire,
 683                         const char *impersonate_princ_s)
 684
 685 {
 686         krb5_error_code retval;
 687         krb5_data packet;
 688         krb5_context context = NULL;
 689         krb5_ccache ccdef = NULL;
 690         krb5_auth_context auth_context = NULL;
 691         krb5_enctype enc_types[] = {
 692                 ENCTYPE_ARCFOUR_HMAC,
 693                 ENCTYPE_DES_CBC_MD5,
 694                 ENCTYPE_DES_CBC_CRC,
 695                 ENCTYPE_NULL};
 696
 697         initialize_krb5_error_table();
 698         retval = krb5_init_context(&context);
 699         if (retval) {
 700                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 701                          error_message(retval)));
 702                 goto failed;
 703         }
 704
 705         if (time_offset != 0) {
 706                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 707         }
 708
 709         if ((retval = krb5_cc_resolve(context, ccname ?
 710                         ccname : krb5_cc_default_name(context), &ccdef))) {
 711                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 712                          error_message(retval)));
 713                 goto failed;
 714         }
 715
 716         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 717                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 718                          error_message(retval)));
 719                 goto failed;
 720         }
 721
 722         retval = ads_krb5_mk_req(context, &auth_context,
 723                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 724                                 principal, ccdef, &packet,
 725                                 tgs_expire, impersonate_princ_s);
 726         if (retval) {
 727                 goto failed;
 728         }
 729
 730         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 731                                  session_key_krb5, false);
 732
 733         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 734
 735         kerberos_free_data_contents(context, &packet);
 736
 737 failed:
 738
 739         if (context) {
 740                 if (ccdef)
 741                         krb5_cc_close(context, ccdef);
 742                 if (auth_context)
 743                         krb5_auth_con_free(context, auth_context);
 744                 krb5_free_context(context);
 745         }
 746
 747         return retval;
 748 }
 749
 750 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 751                               krb5_context context,
 752                               krb5_auth_context auth_context,
 753                               DATA_BLOB *session_key, bool remote)
 754 {
 755         krb5_keyblock *skey = NULL;
 756         krb5_error_code err = 0;
 757         bool ret = false;
 758
 759         if (remote) {
 760                 err = krb5_auth_con_getremotesubkey(context,
 761                                                     auth_context, &skey);
 762         } else {
 763                 err = krb5_auth_con_getlocalsubkey(context,
 764                                                    auth_context, &skey);
 765         }
 766
 767         if (err || skey == NULL) {
 768                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 769                 goto done;
 770         }
 771
 772         DEBUG(10, ("Got KRB5 session key of length %d\n",
 773                    (int)KRB5_KEY_LENGTH(skey)));
 774
 775         *session_key = data_blob_talloc(mem_ctx,
 776                                          KRB5_KEY_DATA(skey),
 777                                          KRB5_KEY_LENGTH(skey));
 778         dump_data_pw("KRB5 Session Key:\n",
 779                      session_key->data,
 780                      session_key->length);
 781
 782         ret = true;
 783
 784 done:
 785         if (skey) {
 786                 krb5_free_keyblock(context, skey);
 787         }
 788
 789         return ret;
 790 }
 791
 792
 793 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 794  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 795
 796  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 797 {
 798         static krb5_data kdata;
 799
 800         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
 801         kdata.length = strlen((const char *)kdata.data);
 802         return &kdata;
 803 }
 804 #endif
 805
 806  time_t get_authtime_from_tkt(krb5_ticket *tkt)
 807 {
 808 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 809         return tkt->enc_part2->times.authtime;
 810 #else
 811         return tkt->ticket.authtime;
 812 #endif
 813 }
 814
 815 #ifdef HAVE_KRB5_DECODE_AP_REQ  /* Heimdal */
 816 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
 817 {
 818 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
 819         if (ap_req->ticket->enc_part.kvno)
 820                 return ap_req->ticket->enc_part.kvno;
 821 #else /* Heimdal */
 822         if (ap_req->ticket.enc_part.kvno)
 823                 return *ap_req->ticket.enc_part.kvno;
 824 #endif
 825         return 0;
 826 }
 827
 828 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
 829 {
 830 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
 831         return ap_req->ticket.enc_part.etype;
 832 #else /* MIT */
 833         return ap_req->ticket->enc_part.enctype;
 834 #endif
 835 }
 836 #endif  /* HAVE_KRB5_DECODE_AP_REQ */
 837
 838 static krb5_error_code
 839 get_key_from_keytab(krb5_context context,
 840                     krb5_const_principal server,
 841                     krb5_enctype enctype,
 842                     krb5_kvno kvno,
 843                     krb5_keyblock **out_key)
 844 {
 845         krb5_keytab_entry entry;
 846         krb5_error_code ret;
 847         krb5_keytab keytab;
 848         char *name = NULL;
 849         krb5_keyblock *keyp;
 850
 851         /* We have to open a new keytab handle here, as MIT does
 852            an implicit open/getnext/close on krb5_kt_get_entry. We
 853            may be in the middle of a keytab enumeration when this is
 854            called. JRA. */
 855
 856         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
 857         if (ret) {
 858                 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 859                 return ret;
 860         }
 861
 862         if ( DEBUGLEVEL >= 10 ) {
 863                 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
 864                         DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
 865                                 kvno, enctype, name));
 866                         TALLOC_FREE(name);
 867                 }
 868         }
 869
 870         ret = krb5_kt_get_entry(context,
 871                                 keytab,
 872                                 server,
 873                                 kvno,
 874                                 enctype,
 875                                 &entry);
 876
 877         if (ret) {
 878                 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
 879                 goto out;
 880         }
 881
 882         keyp = KRB5_KT_KEY(&entry);
 883
 884         ret = krb5_copy_keyblock(context, keyp, out_key);
 885         if (ret) {
 886                 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
 887                 goto out;
 888         }
 889
 890         smb_krb5_kt_free_entry(context, &entry);
 891
 892 out:
 893         krb5_kt_close(context, keytab);
 894         return ret;
 895 }
 896
 897 /* Prototypes */
 898
 899  krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
 900                                                  const krb5_data *inbuf,
 901                                                  krb5_kvno *kvno,
 902                                                  krb5_enctype *enctype)
 903 {
 904 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
 905         {
 906                 krb5_error_code ret;
 907                 krb5_ap_req ap_req;
 908
 909                 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
 910                 if (ret)
 911                         return ret;
 912
 913                 *kvno = get_kvno_from_ap_req(&ap_req);
 914                 *enctype = get_enctype_from_ap_req(&ap_req);
 915
 916                 free_AP_REQ(&ap_req);
 917                 return 0;
 918         }
 919 #endif
 920
 921         /* Possibly not an appropriate error code. */
 922         return KRB5KDC_ERR_BADOPTION;
 923 }
 924
 925  krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
 926                                                         krb5_auth_context *auth_context,
 927                                                         const krb5_data *inbuf,
 928                                                         krb5_const_principal server,
 929                                                         krb5_keytab keytab,
 930                                                         krb5_flags *ap_req_options,
 931                                                         krb5_ticket **ticket,
 932                                                         krb5_keyblock **keyblock)
 933 {
 934         krb5_error_code ret;
 935         krb5_kvno kvno;
 936         krb5_enctype enctype;
 937         krb5_keyblock *local_keyblock;
 938
 939         ret = krb5_rd_req(context,
 940                           auth_context,
 941                           inbuf,
 942                           server,
 943                           keytab,
 944                           ap_req_options,
 945                           ticket);
 946         if (ret) {
 947                 return ret;
 948         }
 949
 950 #ifdef KRB5_TICKET_HAS_KEYINFO
 951         enctype = (*ticket)->enc_part.enctype;
 952         kvno = (*ticket)->enc_part.kvno;
 953 #else
 954         ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
 955         if (ret) {
 956                 return ret;
 957         }
 958 #endif
 959
 960         ret = get_key_from_keytab(context,
 961                                   server,
 962                                   enctype,
 963                                   kvno,
 964                                   &local_keyblock);
 965         if (ret) {
 966                 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
 967                 goto out;
 968         }
 969
 970 out:
 971         if (ret && local_keyblock != NULL) {
 972                 krb5_free_keyblock(context, local_keyblock);
 973         } else {
 974                 *keyblock = local_keyblock;
 975         }
 976
 977         return ret;
 978 }
 979
 980  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
 981                                        const char *client_string,       /* gd@BER.SUSE.DE */
 982                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
 983                                        time_t *expire_time)
 984 {
 985         krb5_error_code ret;
 986         krb5_context context = NULL;
 987         krb5_ccache ccache = NULL;
 988         krb5_principal client = NULL;
 989         krb5_creds creds, creds_in, *creds_out = NULL;
 990
 991         ZERO_STRUCT(creds);
 992         ZERO_STRUCT(creds_in);
 993
 994         initialize_krb5_error_table();
 995         ret = krb5_init_context(&context);
 996         if (ret) {
 997                 goto done;
 998         }
 999
1000         if (!ccache_string) {
1001                 ccache_string = krb5_cc_default_name(context);
1002         }
1003
1004         if (!ccache_string) {
1005                 ret = EINVAL;
1006                 goto done;
1007         }
1008
1009         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1010
1011         /* FIXME: we should not fall back to defaults */
1012         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
1013         if (ret) {
1014                 goto done;
1015         }
1016
1017         if (client_string) {
1018                 ret = smb_krb5_parse_name(context, client_string, &client);
1019                 if (ret) {
1020                         goto done;
1021                 }
1022         } else {
1023                 ret = krb5_cc_get_principal(context, ccache, &client);
1024                 if (ret) {
1025                         goto done;
1026                 }
1027         }
1028
1029         ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
1030         if (ret) {
1031                 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1032                 goto done;
1033         }
1034
1035         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1036         ret = krb5_cc_initialize(context, ccache, client);
1037         if (ret) {
1038                 goto done;
1039         }
1040
1041         ret = krb5_cc_store_cred(context, ccache, &creds);
1042
1043         if (expire_time) {
1044                 *expire_time = (time_t) creds.times.endtime;
1045         }
1046
1047 done:
1048         krb5_free_cred_contents(context, &creds_in);
1049
1050         if (creds_out) {
1051                 krb5_free_creds(context, creds_out);
1052         } else {
1053                 krb5_free_cred_contents(context, &creds);
1054         }
1055
1056         if (client) {
1057                 krb5_free_principal(context, client);
1058         }
1059         if (ccache) {
1060                 krb5_cc_close(context, ccache);
1061         }
1062         if (context) {
1063                 krb5_free_context(context);
1064         }
1065
1066         return ret;
1067 }
1068
1069  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1070 {
1071         krb5_error_code ret = 0;
1072         if (addr == NULL) {
1073                 return ret;
1074         }
1075 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1076         krb5_free_addresses(context, addr->addrs);
1077 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1078         ret = krb5_free_addresses(context, addr->addrs);
1079         SAFE_FREE(addr->addrs);
1080 #endif
1081         SAFE_FREE(addr);
1082         addr = NULL;
1083         return ret;
1084 }
1085
1086  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1087 {
1088         krb5_error_code ret = 0;
1089         nstring buf;
1090 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1091         krb5_address **addrs = NULL;
1092 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1093         krb5_addresses *addrs = NULL;
1094 #endif
1095
1096         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1097         if (*kerb_addr == NULL) {
1098                 return ENOMEM;
1099         }
1100
1101         put_name(buf, lp_netbios_name(), ' ', 0x20);
1102
1103 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1104         {
1105                 int num_addr = 2;
1106
1107                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1108                 if (addrs == NULL) {
1109                         SAFE_FREE(*kerb_addr);
1110                         return ENOMEM;
1111                 }
1112
1113                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1114
1115                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1116                 if (addrs[0] == NULL) {
1117                         SAFE_FREE(addrs);
1118                         SAFE_FREE(*kerb_addr);
1119                         return ENOMEM;
1120                 }
1121
1122                 addrs[0]->magic = KV5M_ADDRESS;
1123                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1124                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1125                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1126                 if (addrs[0]->contents == NULL) {
1127                         SAFE_FREE(addrs[0]);
1128                         SAFE_FREE(addrs);
1129                         SAFE_FREE(*kerb_addr);
1130                         return ENOMEM;
1131                 }
1132
1133                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1134
1135                 addrs[1] = NULL;
1136         }
1137 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1138         {
1139                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1140                 if (addrs == NULL) {
1141                         SAFE_FREE(*kerb_addr);
1142                         return ENOMEM;
1143                 }
1144
1145                 memset(addrs, 0, sizeof(krb5_addresses));
1146
1147                 addrs->len = 1;
1148                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1149                 if (addrs->val == NULL) {
1150                         SAFE_FREE(addrs);
1151                         SAFE_FREE(kerb_addr);
1152                         return ENOMEM;
1153                 }
1154
1155                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1156                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1157                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1158                 if (addrs->val[0].address.data == NULL) {
1159                         SAFE_FREE(addrs->val);
1160                         SAFE_FREE(addrs);
1161                         SAFE_FREE(*kerb_addr);
1162                         return ENOMEM;
1163                 }
1164
1165                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1166         }
1167 #else
1168 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1169 #endif
1170         (*kerb_addr)->addrs = addrs;
1171
1172         return ret;
1173 }
1174
1175  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1176 {
1177 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1178         krb5_free_error_contents(context, krberror);
1179 #else /* MIT */
1180         krb5_free_error(context, krberror);
1181 #endif
1182 }
1183
1184  krb5_error_code handle_krberror_packet(krb5_context context,
1185                                         krb5_data *packet)
1186 {
1187         krb5_error_code ret;
1188         bool got_error_code = False;
1189
1190         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1191
1192 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1193         {
1194                 krb5_error krberror;
1195
1196                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1197                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1198                                 error_message(ret)));
1199                         return ret;
1200                 }
1201
1202                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1203                         ret = (krb5_error_code) krberror.error_code;
1204                         got_error_code = True;
1205                 }
1206
1207                 smb_krb5_free_error(context, &krberror);
1208         }
1209 #else /* MIT */
1210         {
1211                 krb5_error *krberror;
1212
1213                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1214                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1215                                 error_message(ret)));
1216                         return ret;
1217                 }
1218
1219                 if (krberror->e_data.data == NULL) {
1220 #if defined(ERROR_TABLE_BASE_krb5)
1221                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1222 #else
1223                         ret = (krb5_error_code)krberror->error;
1224 #endif
1225                         got_error_code = True;
1226                 }
1227                 smb_krb5_free_error(context, krberror);
1228         }
1229 #endif
1230         if (got_error_code) {
1231                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1232                         error_message(ret), ret));
1233         }
1234         return ret;
1235 }
1236
1237  krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1238                                             krb5_get_init_creds_opt **opt)
1239 {
1240         /* Heimdal or modern MIT version */
1241         return krb5_get_init_creds_opt_alloc(context, opt);
1242 }
1243
1244  void smb_krb5_get_init_creds_opt_free(krb5_context context,
1245                                 krb5_get_init_creds_opt *opt)
1246 {
1247         /* Modern MIT or Heimdal version */
1248         krb5_get_init_creds_opt_free(context, opt);
1249 }
1250
1251  krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1252 {
1253         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1254 }
1255
1256
1257 /* caller needs to free etype_s */
1258  krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1259                                             krb5_enctype enctype,
1260                                             char **etype_s)
1261 {
1262 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1263         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1264 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1265         char buf[256];
1266         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1267         if (ret) {
1268                 return ret;
1269         }
1270         *etype_s = SMB_STRDUP(buf);
1271         if (!*etype_s) {
1272                 return ENOMEM;
1273         }
1274         return ret;
1275 #else
1276 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1277 #endif
1278 }
1279
1280 /**********************************************************************
1281  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1282  * allows to process non-default keytab names.
1283  * @param context krb5_context
1284  * @param keytab_name_req string
1285  * @param write_access bool if writable keytab is required
1286  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1287  * @return krb5_error_code
1288 **********************************************************************/
1289
1290 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1291 #ifndef MAX_KEYTAB_NAME_LEN
1292 #define MAX_KEYTAB_NAME_LEN 1100
1293 #endif
1294
1295  krb5_error_code smb_krb5_open_keytab(krb5_context context,
1296                                       const char *keytab_name_req,
1297                                       bool write_access,
1298                                       krb5_keytab *keytab)
1299 {
1300         krb5_error_code ret = 0;
1301         TALLOC_CTX *mem_ctx;
1302         char keytab_string[MAX_KEYTAB_NAME_LEN];
1303         char *kt_str = NULL;
1304         bool found_valid_name = False;
1305         const char *pragma = "FILE";
1306         const char *tmp = NULL;
1307
1308         if (!write_access && !keytab_name_req) {
1309                 /* caller just wants to read the default keytab readonly, so be it */
1310                 return krb5_kt_default(context, keytab);
1311         }
1312
1313         mem_ctx = talloc_init("smb_krb5_open_keytab");
1314         if (!mem_ctx) {
1315                 return ENOMEM;
1316         }
1317
1318 #ifdef HAVE_WRFILE_KEYTAB
1319         if (write_access) {
1320                 pragma = "WRFILE";
1321         }
1322 #endif
1323
1324         if (keytab_name_req) {
1325
1326                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1327                         ret = KRB5_CONFIG_NOTENUFSPACE;
1328                         goto out;
1329                 }
1330
1331                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1332                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1333                         tmp = keytab_name_req;
1334                         goto resolve;
1335                 }
1336
1337                 if (keytab_name_req[0] != '/') {
1338                         ret = KRB5_KT_BADNAME;
1339                         goto out;
1340                 }
1341
1342                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1343                 if (!tmp) {
1344                         ret = ENOMEM;
1345                         goto out;
1346                 }
1347
1348                 goto resolve;
1349         }
1350
1351         /* we need to handle more complex keytab_strings, like:
1352          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1353
1354         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1355         if (ret) {
1356                 goto out;
1357         }
1358
1359         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1360
1361         tmp = talloc_strdup(mem_ctx, keytab_string);
1362         if (!tmp) {
1363                 ret = ENOMEM;
1364                 goto out;
1365         }
1366
1367         if (strncmp(tmp, "ANY:", 4) == 0) {
1368                 tmp += 4;
1369         }
1370
1371         memset(&keytab_string, '\0', sizeof(keytab_string));
1372
1373         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1374                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1375                         found_valid_name = True;
1376                         tmp = kt_str;
1377                         tmp += 7;
1378                 }
1379
1380                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1381                         found_valid_name = True;
1382                         tmp = kt_str;
1383                         tmp += 5;
1384                 }
1385
1386                 if (tmp[0] == '/') {
1387                         /* Treat as a FILE: keytab definition. */
1388                         found_valid_name = true;
1389                 }
1390
1391                 if (found_valid_name) {
1392                         if (tmp[0] != '/') {
1393                                 ret = KRB5_KT_BADNAME;
1394                                 goto out;
1395                         }
1396
1397                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1398                         if (!tmp) {
1399                                 ret = ENOMEM;
1400                                 goto out;
1401                         }
1402                         break;
1403                 }
1404         }
1405
1406         if (!found_valid_name) {
1407                 ret = KRB5_KT_UNKNOWN_TYPE;
1408                 goto out;
1409         }
1410
1411  resolve:
1412         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1413         ret = krb5_kt_resolve(context, tmp, keytab);
1414
1415  out:
1416         TALLOC_FREE(mem_ctx);
1417         return ret;
1418 }
1419
1420 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1421                                      krb5_context context,
1422                                      krb5_keytab keytab,
1423                                      const char **keytab_name)
1424 {
1425         char keytab_string[MAX_KEYTAB_NAME_LEN];
1426         krb5_error_code ret = 0;
1427
1428         ret = krb5_kt_get_name(context, keytab,
1429                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1430         if (ret) {
1431                 return ret;
1432         }
1433
1434         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1435         if (!*keytab_name) {
1436                 return ENOMEM;
1437         }
1438
1439         return ret;
1440 }
1441
1442 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1443     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1444     defined(HAVE_KRB5_GET_CREDS)
1445 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1446                                                              krb5_ccache ccache,
1447                                                              krb5_principal me,
1448                                                              krb5_principal server,
1449                                                              krb5_principal impersonate_princ,
1450                                                              krb5_creds **out_creds)
1451 {
1452         krb5_error_code ret;
1453         krb5_get_creds_opt opt;
1454
1455         ret = krb5_get_creds_opt_alloc(context, &opt);
1456         if (ret) {
1457                 goto done;
1458         }
1459         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1460
1461         if (impersonate_princ) {
1462                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1463                                                          impersonate_princ);
1464                 if (ret) {
1465                         goto done;
1466                 }
1467         }
1468
1469         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1470         if (ret) {
1471                 goto done;
1472         }
1473
1474  done:
1475         if (opt) {
1476                 krb5_get_creds_opt_free(context, opt);
1477         }
1478         return ret;
1479 }
1480 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1481
1482 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1483 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1484                                                          krb5_ccache ccache,
1485                                                          krb5_principal me,
1486                                                          krb5_principal server,
1487                                                          krb5_principal impersonate_princ,
1488                                                          krb5_creds **out_creds)
1489 {
1490         krb5_error_code ret;
1491         krb5_creds in_creds;
1492
1493 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1494 krb5_error_code KRB5_CALLCONV
1495 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1496                               krb5_ccache ccache, krb5_creds *in_creds,
1497                               krb5_data *subject_cert,
1498                               krb5_creds **out_creds);
1499 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1500
1501         ZERO_STRUCT(in_creds);
1502
1503         if (impersonate_princ) {
1504
1505                 in_creds.server = me;
1506                 in_creds.client = impersonate_princ;
1507
1508                 ret = krb5_get_credentials_for_user(context,
1509                                                     0, /* krb5_flags options */
1510                                                     ccache,
1511                                                     &in_creds,
1512                                                     NULL, /* krb5_data *subject_cert */
1513                                                     out_creds);
1514         } else {
1515                 in_creds.client = me;
1516                 in_creds.server = server;
1517
1518                 ret = krb5_get_credentials(context, 0, ccache,
1519                                            &in_creds, out_creds);
1520         }
1521
1522         return ret;
1523 }
1524 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1525
1526 /*
1527  * smb_krb5_get_credentials
1528  *
1529  * @brief Get krb5 credentials for a server
1530  *
1531  * @param[in] context           An initialized krb5_context
1532  * @param[in] ccache            An initialized krb5_ccache
1533  * @param[in] me                The krb5_principal of the caller
1534  * @param[in] server            The krb5_principal of the requested service
1535  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1536  * @param[out] out_creds        The returned krb5_creds structure
1537  * @return krb5_error_code
1538  *
1539  */
1540 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1541                                          krb5_ccache ccache,
1542                                          krb5_principal me,
1543                                          krb5_principal server,
1544                                          krb5_principal impersonate_princ,
1545                                          krb5_creds **out_creds)
1546 {
1547         krb5_error_code ret;
1548         krb5_creds *creds = NULL;
1549
1550         *out_creds = NULL;
1551
1552         if (impersonate_princ) {
1553 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1554                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1555 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1556                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1557 #else
1558                 ret = ENOTSUP;
1559 #endif
1560         } else {
1561                 krb5_creds in_creds;
1562
1563                 ZERO_STRUCT(in_creds);
1564
1565                 in_creds.client = me;
1566                 in_creds.server = server;
1567
1568                 ret = krb5_get_credentials(context, 0, ccache,
1569                                            &in_creds, &creds);
1570         }
1571         if (ret) {
1572                 goto done;
1573         }
1574
1575         if (out_creds) {
1576                 *out_creds = creds;
1577         }
1578
1579  done:
1580         if (creds && ret) {
1581                 krb5_free_creds(context, creds);
1582         }
1583
1584         return ret;
1585 }
1586
1587 /*
1588  * smb_krb5_get_creds
1589  *
1590  * @brief Get krb5 credentials for a server
1591  *
1592  * @param[in] server_s          The string name of the service
1593  * @param[in] time_offset       The offset to the KDCs time in seconds (optional)
1594  * @param[in] cc                The krb5 credential cache string name (optional)
1595  * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
1596  * @param[out] creds_p          The returned krb5_creds structure
1597  * @return krb5_error_code
1598  *
1599  */
1600 krb5_error_code smb_krb5_get_creds(const char *server_s,
1601                                    time_t time_offset,
1602                                    const char *cc,
1603                                    const char *impersonate_princ_s,
1604                                    krb5_creds **creds_p)
1605 {
1606         krb5_error_code ret;
1607         krb5_context context = NULL;
1608         krb5_principal me = NULL;
1609         krb5_principal server = NULL;
1610         krb5_principal impersonate_princ = NULL;
1611         krb5_creds *creds = NULL;
1612         krb5_ccache ccache = NULL;
1613
1614         *creds_p = NULL;
1615
1616         initialize_krb5_error_table();
1617         ret = krb5_init_context(&context);
1618         if (ret) {
1619                 goto done;
1620         }
1621
1622         if (time_offset != 0) {
1623                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
1624         }
1625
1626         ret = krb5_cc_resolve(context, cc ? cc :
1627                 krb5_cc_default_name(context), &ccache);
1628         if (ret) {
1629                 goto done;
1630         }
1631
1632         ret = krb5_cc_get_principal(context, ccache, &me);
1633         if (ret) {
1634                 goto done;
1635         }
1636
1637         ret = smb_krb5_parse_name(context, server_s, &server);
1638         if (ret) {
1639                 goto done;
1640         }
1641
1642         if (impersonate_princ_s) {
1643                 ret = smb_krb5_parse_name(context, impersonate_princ_s,
1644                                           &impersonate_princ);
1645                 if (ret) {
1646                         goto done;
1647                 }
1648         }
1649
1650         ret = smb_krb5_get_credentials(context, ccache,
1651                                        me, server, impersonate_princ,
1652                                        &creds);
1653         if (ret) {
1654                 goto done;
1655         }
1656
1657         ret = krb5_cc_store_cred(context, ccache, creds);
1658         if (ret) {
1659                 goto done;
1660         }
1661
1662         if (creds_p) {
1663                 *creds_p = creds;
1664         }
1665
1666         DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
1667                 server_s));
1668
1669         if (impersonate_princ_s) {
1670                 char *client = NULL;
1671
1672                 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
1673                 if (ret) {
1674                         goto done;
1675                 }
1676                 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
1677                         client));
1678                 TALLOC_FREE(client);
1679         }
1680
1681  done:
1682         if (!context) {
1683                 return ret;
1684         }
1685
1686         if (creds && ret) {
1687                 krb5_free_creds(context, creds);
1688         }
1689         if (server) {
1690                 krb5_free_principal(context, server);
1691         }
1692         if (me) {
1693                 krb5_free_principal(context, me);
1694         }
1695         if (impersonate_princ) {
1696                 krb5_free_principal(context, impersonate_princ);
1697         }
1698         if (ccache) {
1699                 krb5_cc_close(context, ccache);
1700         }
1701         krb5_free_context(context);
1702
1703         return ret;
1704 }
1705
1706 /*
1707  * smb_krb5_principal_get_realm
1708  *
1709  * @brief Get realm of a principal
1710  *
1711  * @param[in] context           The krb5_context
1712  * @param[in] principal         The principal
1713  * @return pointer to the realm
1714  *
1715  */
1716
1717 char *smb_krb5_principal_get_realm(krb5_context context,
1718                                    krb5_principal principal)
1719 {
1720 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
1721         return discard_const_p(char, krb5_principal_get_realm(context, principal));
1722 #elif defined(krb5_princ_realm) /* MIT */
1723         krb5_data *realm;
1724         realm = krb5_princ_realm(context, principal);
1725         return discard_const_p(char, realm->data);
1726 #else
1727         return NULL;
1728 #endif
1729 }
1730
1731 #else /* HAVE_KRB5 */
1732  /* this saves a few linking headaches */
1733  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
1734                         const char *principal, time_t time_offset,
1735                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
1736                         uint32_t extra_ap_opts,
1737                         const char *ccname, time_t *tgs_expire,
1738                         const char *impersonate_princ_s)
1739 {
1740          DEBUG(0,("NO KERBEROS SUPPORT\n"));
1741          return 1;
1742 }
1743
1744 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
1745 {
1746         DEBUG(0,("NO KERBEROS SUPPORT\n"));
1747         return false;
1748 }
1749
1750 #endif /* HAVE_KRB5 */