lib/krb5_wrap/krb5_samba.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 "system/filesys.h"
  25 #include "krb5_samba.h"
  26 #include "lib/util/asn1.h"
  27
  28 #ifdef HAVE_COM_ERR_H
  29 #include <com_err.h>
  30 #endif /* HAVE_COM_ERR_H */
  31
  32 #ifndef KRB5_AUTHDATA_WIN2K_PAC
  33 #define KRB5_AUTHDATA_WIN2K_PAC 128
  34 #endif
  35
  36 #ifndef KRB5_AUTHDATA_IF_RELEVANT
  37 #define KRB5_AUTHDATA_IF_RELEVANT 1
  38 #endif
  39
  40 #ifdef HAVE_KRB5
  41
  42 #define GSSAPI_CHECKSUM      0x8003             /* Checksum type value for Kerberos */
  43 #define GSSAPI_BNDLENGTH     16                 /* Bind Length (rfc-1964 pg.3) */
  44 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
  45                                                         bind field, flags field. */
  46 #define GSS_C_DELEG_FLAG 1
  47
  48 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
  49    but still has the symbol */
  50 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
  51 krb5_error_code krb5_auth_con_set_req_cksumtype(
  52         krb5_context     context,
  53         krb5_auth_context      auth_context,
  54         krb5_cksumtype     cksumtype);
  55 #endif
  56
  57 #if !defined(SMB_MALLOC)
  58 #undef malloc
  59 #define SMB_MALLOC(s) malloc((s))
  60 #endif
  61
  62 #ifndef SMB_STRDUP
  63 #define SMB_STRDUP(s) strdup(s)
  64 #endif
  65
  66 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
  67
  68 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
  69
  70 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
  71  * to krb5_set_default_tgs_ktypes. See
  72  *         http://lists.samba.org/archive/samba-technical/2006-July/048271.html
  73  *
  74  * If the MIT libraries are not exporting internal symbols, we will end up in
  75  * this branch, which is correct. Otherwise we will continue to use the
  76  * internal symbol
  77  */
  78  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  79 {
  80     return krb5_set_default_tgs_enctypes(ctx, enc);
  81 }
  82
  83 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
  84
  85 /* Heimdal */
  86  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  87 {
  88         return krb5_set_default_in_tkt_etypes(ctx, enc);
  89 }
  90
  91 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
  92
  93 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
  94
  95 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
  96 /* HEIMDAL */
  97  bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
  98 {
  99         memset(pkaddr, '\0', sizeof(krb5_address));
 100 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
 101         if (paddr->ss_family == AF_INET6) {
 102                 pkaddr->addr_type = KRB5_ADDRESS_INET6;
 103                 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 104                 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 105                 return true;
 106         }
 107 #endif
 108         if (paddr->ss_family == AF_INET) {
 109                 pkaddr->addr_type = KRB5_ADDRESS_INET;
 110                 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 111                 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
 112                 return true;
 113         }
 114         return false;
 115 }
 116 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
 117 /* MIT */
 118 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
 119 {
 120         memset(pkaddr, '\0', sizeof(krb5_address));
 121 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
 122         if (paddr->ss_family == AF_INET6) {
 123                 pkaddr->addrtype = ADDRTYPE_INET6;
 124                 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
 125                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
 126                 return true;
 127         }
 128 #endif
 129         if (paddr->ss_family == AF_INET) {
 130                 pkaddr->addrtype = ADDRTYPE_INET;
 131                 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
 132                 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
 133                 return true;
 134         }
 135         return false;
 136 }
 137 #else
 138 #error UNKNOWN_ADDRTYPE
 139 #endif
 140
 141 /**
 142 * @brief Create a keyblock based on input parameters
 143 *
 144 * @param context        The krb5_context
 145 * @param host_princ     The krb5_principal to use
 146 * @param salt           The optional salt, if omitted, salt is calculated with
 147 *                       the provided principal.
 148 * @param password       The krb5_data containing the password
 149 * @param enctype        The krb5_enctype to use for the keyblock generation
 150 * @param key            The returned krb5_keyblock, caller needs to free with
 151 *                       krb5_free_keyblock().
 152 *
 153 * @return krb5_error_code
 154 */
 155 int smb_krb5_create_key_from_string(krb5_context context,
 156                                     krb5_const_principal host_princ,
 157                                     krb5_data *salt,
 158                                     krb5_data *password,
 159                                     krb5_enctype enctype,
 160                                     krb5_keyblock *key)
 161 {
 162         int ret = 0;
 163
 164         if (host_princ == NULL && salt == NULL) {
 165                 return -1;
 166         }
 167
 168 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
 169 {/* MIT */
 170         krb5_data _salt;
 171
 172         if (salt == NULL) {
 173                 ret = krb5_principal2salt(context, host_princ, &_salt);
 174                 if (ret) {
 175                         DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
 176                         return ret;
 177                 }
 178         } else {
 179                 _salt = *salt;
 180         }
 181         ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
 182         if (salt == NULL) {
 183                 SAFE_FREE(_salt.data);
 184         }
 185 }
 186 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
 187 {/* Heimdal */
 188         krb5_salt _salt;
 189
 190         if (salt == NULL) {
 191                 ret = krb5_get_pw_salt(context, host_princ, &_salt);
 192                 if (ret) {
 193                         DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 194                         return ret;
 195                 }
 196         } else {
 197                 _salt.saltvalue = *salt;
 198                 _salt.salttype = KRB5_PW_SALT;
 199         }
 200
 201         ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
 202         if (salt == NULL) {
 203                 krb5_free_salt(context, _salt);
 204         }
 205 }
 206 #else
 207 #error UNKNOWN_CREATE_KEY_FUNCTIONS
 208 #endif
 209         return ret;
 210 }
 211
 212 /**
 213 * @brief Create a salt for a given principal
 214 *
 215 * @param context        The initialized krb5_context
 216 * @param host_princ     The krb5_principal to create the salt for
 217 * @param psalt          A pointer to a krb5_data struct
 218 *
 219 * caller has to free the contents of psalt with kerberos_free_data_contents
 220 * when function has succeeded
 221 *
 222 * @return krb5_error_code, returns 0 on success, error code otherwise
 223 */
 224
 225 int smb_krb5_get_pw_salt(krb5_context context,
 226                          krb5_const_principal host_princ,
 227                          krb5_data *psalt)
 228 #if defined(HAVE_KRB5_GET_PW_SALT)
 229 /* Heimdal */
 230 {
 231         int ret;
 232         krb5_salt salt;
 233
 234         ret = krb5_get_pw_salt(context, host_princ, &salt);
 235         if (ret) {
 236                 return ret;
 237         }
 238
 239         psalt->data = salt.saltvalue.data;
 240         psalt->length = salt.saltvalue.length;
 241
 242         return ret;
 243 }
 244 #elif defined(HAVE_KRB5_PRINCIPAL2SALT)
 245 /* MIT */
 246 {
 247         return krb5_principal2salt(context, host_princ, psalt);
 248 }
 249 #else
 250 #error UNKNOWN_SALT_FUNCTIONS
 251 #endif
 252
 253 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 254  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 255                                             krb5_enctype **enctypes)
 256 {
 257         return krb5_get_permitted_enctypes(context, enctypes);
 258 }
 259 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 260  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 261                                             krb5_enctype **enctypes)
 262 {
 263 #ifdef HAVE_KRB5_PDU_NONE_DECL
 264         return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
 265 #else
 266         return krb5_get_default_in_tkt_etypes(context, enctypes);
 267 #endif
 268 }
 269 #else
 270 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 271 #endif
 272
 273 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 274  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 275                                         krb5_auth_context auth_context,
 276                                         krb5_keyblock *keyblock)
 277 {
 278         return krb5_auth_con_setkey(context, auth_context, keyblock);
 279 }
 280 #endif
 281
 282 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
 283                            DATA_BLOB *edata,
 284                            DATA_BLOB *edata_out)
 285 {
 286         DATA_BLOB edata_contents;
 287         ASN1_DATA *data;
 288         int edata_type;
 289
 290         if (!edata->length) {
 291                 return false;
 292         }
 293
 294         data = asn1_init(mem_ctx);
 295         if (data == NULL) {
 296                 return false;
 297         }
 298
 299         if (!asn1_load(data, *edata)) goto err;
 300         if (!asn1_start_tag(data, ASN1_SEQUENCE(0))) goto err;
 301         if (!asn1_start_tag(data, ASN1_CONTEXT(1))) goto err;
 302         if (!asn1_read_Integer(data, &edata_type)) goto err;
 303
 304         if (edata_type != KRB5_PADATA_PW_SALT) {
 305                 DEBUG(0,("edata is not of required type %d but of type %d\n",
 306                         KRB5_PADATA_PW_SALT, edata_type));
 307                 goto err;
 308         }
 309
 310         if (!asn1_start_tag(data, ASN1_CONTEXT(2))) goto err;
 311         if (!asn1_read_OctetString(data, talloc_tos(), &edata_contents)) goto err;
 312         if (!asn1_end_tag(data)) goto err;
 313         if (!asn1_end_tag(data)) goto err;
 314         if (!asn1_end_tag(data)) goto err;
 315         asn1_free(data);
 316
 317         *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
 318
 319         data_blob_free(&edata_contents);
 320
 321         return true;
 322
 323   err:
 324
 325         asn1_free(data);
 326         return false;
 327 }
 328
 329
 330 static bool ads_cleanup_expired_creds(krb5_context context,
 331                                       krb5_ccache  ccache,
 332                                       krb5_creds  *credsp)
 333 {
 334         krb5_error_code retval;
 335         const char *cc_type = krb5_cc_get_type(context, ccache);
 336
 337         DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
 338                   cc_type, krb5_cc_get_name(context, ccache),
 339                   http_timestring(talloc_tos(), credsp->times.endtime)));
 340
 341         /* we will probably need new tickets if the current ones
 342            will expire within 10 seconds.
 343         */
 344         if (credsp->times.endtime >= (time(NULL) + 10))
 345                 return false;
 346
 347         /* heimdal won't remove creds from a file ccache, and
 348            perhaps we shouldn't anyway, since internally we
 349            use memory ccaches, and a FILE one probably means that
 350            we're using creds obtained outside of our exectuable
 351         */
 352         if (strequal(cc_type, "FILE")) {
 353                 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
 354                 return false;
 355         }
 356
 357         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 358         if (retval) {
 359                 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
 360                           error_message(retval)));
 361                 /* If we have an error in this, we want to display it,
 362                    but continue as though we deleted it */
 363         }
 364         return true;
 365 }
 366
 367 /* Allocate and setup the auth context into the state we need. */
 368
 369 static krb5_error_code setup_auth_context(krb5_context context,
 370                         krb5_auth_context *auth_context)
 371 {
 372         krb5_error_code retval;
 373
 374         retval = krb5_auth_con_init(context, auth_context );
 375         if (retval) {
 376                 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
 377                         error_message(retval)));
 378                 return retval;
 379         }
 380
 381         /* Ensure this is an addressless ticket. */
 382         retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
 383         if (retval) {
 384                 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
 385                         error_message(retval)));
 386         }
 387
 388         return retval;
 389 }
 390
 391 #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)
 392 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
 393                                                 uint32_t gss_flags)
 394 {
 395         unsigned int orig_length = in_data->length;
 396         unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
 397         char *gss_cksum = NULL;
 398
 399         if (orig_length) {
 400                 /* Extra length field for delgated ticket. */
 401                 base_cksum_size += 4;
 402         }
 403
 404         if ((unsigned int)base_cksum_size + orig_length <
 405                         (unsigned int)base_cksum_size) {
 406                 return EINVAL;
 407         }
 408
 409         gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
 410         if (gss_cksum == NULL) {
 411                 return ENOMEM;
 412         }
 413
 414         memset(gss_cksum, '\0', base_cksum_size + orig_length);
 415         SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
 416
 417         /*
 418          * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
 419          * This matches the behavior of heimdal and mit.
 420          *
 421          * And it is needed to work against some closed source
 422          * SMB servers.
 423          *
 424          * See bug #7883
 425          */
 426         memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
 427
 428         SIVAL(gss_cksum, 20, gss_flags);
 429
 430         if (orig_length) {
 431                 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
 432                 SSVAL(gss_cksum, 26, orig_length);
 433                 /* Copy the kerberos KRB_CRED data */
 434                 memcpy(gss_cksum + 28, in_data->data, orig_length);
 435                 free(in_data->data);
 436                 in_data->data = NULL;
 437                 in_data->length = 0;
 438         }
 439         in_data->data = gss_cksum;
 440         in_data->length = base_cksum_size + orig_length;
 441         return 0;
 442 }
 443 #endif
 444
 445 /**************************************************************
 446  krb5_parse_name that takes a UNIX charset.
 447 **************************************************************/
 448
 449 krb5_error_code smb_krb5_parse_name(krb5_context context,
 450                                 const char *name, /* in unix charset */
 451                                 krb5_principal *principal)
 452 {
 453         krb5_error_code ret;
 454         char *utf8_name;
 455         size_t converted_size;
 456         TALLOC_CTX *frame = talloc_stackframe();
 457
 458         if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
 459                 talloc_free(frame);
 460                 return ENOMEM;
 461         }
 462
 463         ret = krb5_parse_name(context, utf8_name, principal);
 464         TALLOC_FREE(frame);
 465         return ret;
 466 }
 467
 468 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 469 void krb5_free_unparsed_name(krb5_context context, char *val)
 470 {
 471         SAFE_FREE(val);
 472 }
 473 #endif
 474
 475 /**************************************************************
 476  krb5_parse_name that returns a UNIX charset name. Must
 477  be freed with talloc_free() call.
 478 **************************************************************/
 479
 480 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
 481                                       krb5_context context,
 482                                       krb5_const_principal principal,
 483                                       char **unix_name)
 484 {
 485         krb5_error_code ret;
 486         char *utf8_name;
 487         size_t converted_size;
 488
 489         *unix_name = NULL;
 490         ret = krb5_unparse_name(context, principal, &utf8_name);
 491         if (ret) {
 492                 return ret;
 493         }
 494
 495         if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
 496                 krb5_free_unparsed_name(context, utf8_name);
 497                 return ENOMEM;
 498         }
 499         krb5_free_unparsed_name(context, utf8_name);
 500         return 0;
 501 }
 502
 503 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
 504                                             const char *name,
 505                                             krb5_principal *principal)
 506 {
 507         /* we are cheating here because parse_name will in fact set the realm.
 508          * We don't care as the only caller of smb_krb5_parse_name_norealm
 509          * ignores the realm anyway when calling
 510          * smb_krb5_principal_compare_any_realm later - Guenther */
 511
 512         return smb_krb5_parse_name(context, name, principal);
 513 }
 514
 515 bool smb_krb5_principal_compare_any_realm(krb5_context context,
 516                                           krb5_const_principal princ1,
 517                                           krb5_const_principal princ2)
 518 {
 519         return krb5_principal_compare_any_realm(context, princ1, princ2);
 520 }
 521
 522 /*
 523   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 524 */
 525 static krb5_error_code ads_krb5_mk_req(krb5_context context,
 526                                        krb5_auth_context *auth_context,
 527                                        const krb5_flags ap_req_options,
 528                                        const char *principal,
 529                                        krb5_ccache ccache,
 530                                        krb5_data *outbuf,
 531                                        time_t *expire_time,
 532                                        const char *impersonate_princ_s)
 533 {
 534         krb5_error_code           retval;
 535         krb5_principal    server;
 536         krb5_principal impersonate_princ = NULL;
 537         krb5_creds              * credsp;
 538         krb5_creds                creds;
 539         krb5_data in_data;
 540         bool creds_ready = false;
 541         int i = 0, maxtries = 3;
 542
 543         ZERO_STRUCT(in_data);
 544
 545         retval = smb_krb5_parse_name(context, principal, &server);
 546         if (retval) {
 547                 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
 548                 return retval;
 549         }
 550
 551         if (impersonate_princ_s) {
 552                 retval = smb_krb5_parse_name(context, impersonate_princ_s,
 553                                              &impersonate_princ);
 554                 if (retval) {
 555                         DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
 556                         goto cleanup_princ;
 557                 }
 558         }
 559
 560         /* obtain ticket & session key */
 561         ZERO_STRUCT(creds);
 562         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 563                 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
 564                          error_message(retval)));
 565                 goto cleanup_princ;
 566         }
 567
 568         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 569                 /* This can commonly fail on smbd startup with no ticket in the cache.
 570                  * Report at higher level than 1. */
 571                 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
 572                          error_message(retval)));
 573                 goto cleanup_creds;
 574         }
 575
 576         while (!creds_ready && (i < maxtries)) {
 577
 578                 if ((retval = smb_krb5_get_credentials(context, ccache,
 579                                                        creds.client,
 580                                                        creds.server,
 581                                                        impersonate_princ,
 582                                                        &credsp))) {
 583                         DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
 584                                 principal, error_message(retval)));
 585                         goto cleanup_creds;
 586                 }
 587
 588                 /* cope with ticket being in the future due to clock skew */
 589                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 590                         time_t t = time(NULL);
 591                         int time_offset =(int)((unsigned)credsp->times.starttime-t);
 592                         DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 593                         krb5_set_real_time(context, t + time_offset + 1, 0);
 594                 }
 595
 596                 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
 597                         creds_ready = true;
 598                 }
 599
 600                 i++;
 601         }
 602
 603         DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
 604                   principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
 605                   http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
 606                   (unsigned)credsp->times.endtime));
 607
 608         if (expire_time) {
 609                 *expire_time = (time_t)credsp->times.endtime;
 610         }
 611
 612         /* Allocate the auth_context. */
 613         retval = setup_auth_context(context, auth_context);
 614         if (retval) {
 615                 DEBUG(1,("setup_auth_context failed (%s)\n",
 616                         error_message(retval)));
 617                 goto cleanup_creds;
 618         }
 619
 620 #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)
 621         {
 622                 uint32_t gss_flags = 0;
 623
 624                 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
 625                         /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
 626                          as part of the kerberos exchange. */
 627
 628                         DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n")  );
 629
 630                         retval = krb5_auth_con_setuseruserkey(context,
 631                                         *auth_context,
 632                                         &credsp->keyblock );
 633                         if (retval) {
 634                                 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
 635                                         error_message(retval)));
 636                                 goto cleanup_creds;
 637                         }
 638
 639                         /* Must use a subkey for forwarded tickets. */
 640                         retval = krb5_auth_con_setflags(context,
 641                                 *auth_context,
 642                                 KRB5_AUTH_CONTEXT_USE_SUBKEY);
 643                         if (retval) {
 644                                 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
 645                                         error_message(retval)));
 646                                 goto cleanup_creds;
 647                         }
 648
 649                         retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
 650                                 *auth_context,  /* Authentication context [in] */
 651                                 discard_const_p(char, KRB5_TGS_NAME),  /* Ticket service name ("krbtgt") [in] */
 652                                 credsp->client, /* Client principal for the tgt [in] */
 653                                 credsp->server, /* Server principal for the tgt [in] */
 654                                 ccache,         /* Credential cache to use for storage [in] */
 655                                 1,              /* Turn on for "Forwardable ticket" [in] */
 656                                 &in_data );     /* Resulting response [out] */
 657
 658                         if (retval) {
 659                                 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
 660                                            error_message( retval ) ) );
 661
 662                                 /*
 663                                  * This is not fatal. Delete the *auth_context and continue
 664                                  * with krb5_mk_req_extended to get a non-forwardable ticket.
 665                                  */
 666
 667                                 if (in_data.data) {
 668                                         free( in_data.data );
 669                                         in_data.data = NULL;
 670                                         in_data.length = 0;
 671                                 }
 672                                 krb5_auth_con_free(context, *auth_context);
 673                                 *auth_context = NULL;
 674                                 retval = setup_auth_context(context, auth_context);
 675                                 if (retval) {
 676                                         DEBUG(1,("setup_auth_context failed (%s)\n",
 677                                                 error_message(retval)));
 678                                         goto cleanup_creds;
 679                                 }
 680                         } else {
 681                                 /* We got a delegated ticket. */
 682                                 gss_flags |= GSS_C_DELEG_FLAG;
 683                         }
 684                 }
 685
 686                 /* Frees and reallocates in_data into a GSS checksum blob. */
 687                 retval = create_gss_checksum(&in_data, gss_flags);
 688                 if (retval) {
 689                         goto cleanup_data;
 690                 }
 691
 692                 /* We always want GSS-checksum types. */
 693                 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
 694                 if (retval) {
 695                         DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
 696                                 error_message(retval)));
 697                         goto cleanup_data;
 698                 }
 699         }
 700 #endif
 701
 702         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 703                                       &in_data, credsp, outbuf);
 704         if (retval) {
 705                 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
 706                          error_message(retval)));
 707         }
 708
 709 #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)
 710 cleanup_data:
 711 #endif
 712
 713         if (in_data.data) {
 714                 free( in_data.data );
 715                 in_data.length = 0;
 716         }
 717
 718         krb5_free_creds(context, credsp);
 719
 720 cleanup_creds:
 721         krb5_free_cred_contents(context, &creds);
 722
 723 cleanup_princ:
 724         krb5_free_principal(context, server);
 725         if (impersonate_princ) {
 726                 krb5_free_principal(context, impersonate_princ);
 727         }
 728
 729         return retval;
 730 }
 731
 732 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
 733 {
 734 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
 735         if (pdata->data) {
 736                 krb5_free_data_contents(context, pdata);
 737         }
 738 #elif defined(HAVE_KRB5_DATA_FREE)
 739         krb5_data_free(context, pdata);
 740 #else
 741         SAFE_FREE(pdata->data);
 742 #endif
 743 }
 744
 745 /*
 746  * @brief copy a buffer into a krb5_data struct
 747  *
 748  * @param[in] p                 The krb5_data
 749  * @param[in] data              The data to copy
 750  * @param[in] length            The length of the data to copy
 751  * @return krb5_error_code
 752  *
 753  * Caller has to free krb5_data with kerberos_free_data_contents().
 754  */
 755
 756 krb5_error_code krb5_copy_data_contents(krb5_data *p,
 757                                         const void *data,
 758                                         size_t len)
 759 {
 760 #if defined(HAVE_KRB5_DATA_COPY)
 761         return krb5_data_copy(p, data, len);
 762 #else
 763         if (len) {
 764                 p->data = malloc(len);
 765                 if (p->data == NULL) {
 766                         return ENOMEM;
 767                 }
 768                 memmove(p->data, data, len);
 769         } else {
 770                 p->data = NULL;
 771         }
 772         p->length = len;
 773         p->magic = KV5M_DATA;
 774         return 0;
 775 #endif
 776 }
 777
 778 /*
 779   get a kerberos5 ticket for the given service
 780 */
 781 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
 782                         const char *principal, time_t time_offset,
 783                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
 784                         uint32_t extra_ap_opts, const char *ccname,
 785                         time_t *tgs_expire,
 786                         const char *impersonate_princ_s)
 787
 788 {
 789         krb5_error_code retval;
 790         krb5_data packet;
 791         krb5_context context = NULL;
 792         krb5_ccache ccdef = NULL;
 793         krb5_auth_context auth_context = NULL;
 794         krb5_enctype enc_types[] = {
 795 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
 796                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
 797 #endif
 798 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
 799                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
 800 #endif
 801                 ENCTYPE_ARCFOUR_HMAC,
 802                 ENCTYPE_DES_CBC_MD5,
 803                 ENCTYPE_DES_CBC_CRC,
 804                 ENCTYPE_NULL};
 805
 806         initialize_krb5_error_table();
 807         retval = krb5_init_context(&context);
 808         if (retval) {
 809                 DEBUG(1, ("krb5_init_context failed (%s)\n",
 810                          error_message(retval)));
 811                 goto failed;
 812         }
 813
 814         if (time_offset != 0) {
 815                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 816         }
 817
 818         if ((retval = krb5_cc_resolve(context, ccname ?
 819                         ccname : krb5_cc_default_name(context), &ccdef))) {
 820                 DEBUG(1, ("krb5_cc_default failed (%s)\n",
 821                          error_message(retval)));
 822                 goto failed;
 823         }
 824
 825         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 826                 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
 827                          error_message(retval)));
 828                 goto failed;
 829         }
 830
 831         retval = ads_krb5_mk_req(context, &auth_context,
 832                                 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
 833                                 principal, ccdef, &packet,
 834                                 tgs_expire, impersonate_princ_s);
 835         if (retval) {
 836                 goto failed;
 837         }
 838
 839         get_krb5_smb_session_key(mem_ctx, context, auth_context,
 840                                  session_key_krb5, false);
 841
 842         *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
 843
 844         kerberos_free_data_contents(context, &packet);
 845
 846 failed:
 847
 848         if (context) {
 849                 if (ccdef)
 850                         krb5_cc_close(context, ccdef);
 851                 if (auth_context)
 852                         krb5_auth_con_free(context, auth_context);
 853                 krb5_free_context(context);
 854         }
 855
 856         return retval;
 857 }
 858
 859 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
 860                               krb5_context context,
 861                               krb5_auth_context auth_context,
 862                               DATA_BLOB *session_key, bool remote)
 863 {
 864         krb5_keyblock *skey = NULL;
 865         krb5_error_code err = 0;
 866         bool ret = false;
 867
 868         if (remote) {
 869 #ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
 870                 err = krb5_auth_con_getrecvsubkey(context,
 871                                                   auth_context,
 872                                                   &skey);
 873 #else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
 874                 err = krb5_auth_con_getremotesubkey(context,
 875                                                     auth_context, &skey);
 876 #endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
 877         } else {
 878 #ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
 879                 err = krb5_auth_con_getsendsubkey(context,
 880                                                   auth_context,
 881                                                   &skey);
 882 #else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
 883                 err = krb5_auth_con_getlocalsubkey(context,
 884                                                    auth_context, &skey);
 885 #endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
 886         }
 887
 888         if (err || skey == NULL) {
 889                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 890                 goto done;
 891         }
 892
 893         DEBUG(10, ("Got KRB5 session key of length %d\n",
 894                    (int)KRB5_KEY_LENGTH(skey)));
 895
 896         *session_key = data_blob_talloc(mem_ctx,
 897                                          KRB5_KEY_DATA(skey),
 898                                          KRB5_KEY_LENGTH(skey));
 899         dump_data_pw("KRB5 Session Key:\n",
 900                      session_key->data,
 901                      session_key->length);
 902
 903         ret = true;
 904
 905 done:
 906         if (skey) {
 907                 krb5_free_keyblock(context, skey);
 908         }
 909
 910         return ret;
 911 }
 912
 913
 914 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 915  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
 916
 917  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 918 {
 919         static krb5_data kdata;
 920
 921         kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
 922         kdata.length = strlen((const char *)kdata.data);
 923         return &kdata;
 924 }
 925 #endif
 926
 927 /*
 928  * @brief Get talloced string component of a principal
 929  *
 930  * @param[in] mem_ctx           The TALLOC_CTX
 931  * @param[in] context           The krb5_context
 932  * @param[in] principal         The principal
 933  * @param[in] component         The component
 934  * @return string component
 935  *
 936  * Caller must talloc_free if the return value is not NULL.
 937  *
 938  */
 939
 940 /* caller has to free returned string with talloc_free() */
 941 char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
 942                                          krb5_context context,
 943                                          krb5_const_principal principal,
 944                                          unsigned int component)
 945 {
 946 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
 947         return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
 948 #else
 949         krb5_data *data;
 950
 951         if (component >= krb5_princ_size(context, principal)) {
 952                 return NULL;
 953         }
 954
 955         data = krb5_princ_component(context, principal, component);
 956         if (data == NULL) {
 957                 return NULL;
 958         }
 959
 960         return talloc_strndup(mem_ctx, data->data, data->length);
 961 #endif
 962 }
 963
 964 /* Prototypes */
 965
 966  krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,       /* FILE:/tmp/krb5cc_0 */
 967                                        const char *client_string,       /* gd@BER.SUSE.DE */
 968                                        const char *service_string,      /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
 969                                        time_t *expire_time)
 970 {
 971         krb5_error_code ret;
 972         krb5_context context = NULL;
 973         krb5_ccache ccache = NULL;
 974         krb5_principal client = NULL;
 975         krb5_creds creds, creds_in;
 976
 977         ZERO_STRUCT(creds);
 978         ZERO_STRUCT(creds_in);
 979
 980         initialize_krb5_error_table();
 981         ret = krb5_init_context(&context);
 982         if (ret) {
 983                 goto done;
 984         }
 985
 986         if (!ccache_string) {
 987                 ccache_string = krb5_cc_default_name(context);
 988         }
 989
 990         if (!ccache_string) {
 991                 ret = EINVAL;
 992                 goto done;
 993         }
 994
 995         DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
 996
 997         /* FIXME: we should not fall back to defaults */
 998         ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
 999         if (ret) {
1000                 goto done;
1001         }
1002
1003         if (client_string) {
1004                 ret = smb_krb5_parse_name(context, client_string, &client);
1005                 if (ret) {
1006                         goto done;
1007                 }
1008         } else {
1009                 ret = krb5_cc_get_principal(context, ccache, &client);
1010                 if (ret) {
1011                         goto done;
1012                 }
1013         }
1014
1015         ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
1016         if (ret) {
1017                 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1018                 goto done;
1019         }
1020
1021         /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1022         ret = krb5_cc_initialize(context, ccache, client);
1023         if (ret) {
1024                 goto done;
1025         }
1026
1027         ret = krb5_cc_store_cred(context, ccache, &creds);
1028
1029         if (expire_time) {
1030                 *expire_time = (time_t) creds.times.endtime;
1031         }
1032
1033 done:
1034         krb5_free_cred_contents(context, &creds_in);
1035         krb5_free_cred_contents(context, &creds);
1036
1037         if (client) {
1038                 krb5_free_principal(context, client);
1039         }
1040         if (ccache) {
1041                 krb5_cc_close(context, ccache);
1042         }
1043         if (context) {
1044                 krb5_free_context(context);
1045         }
1046
1047         return ret;
1048 }
1049
1050  krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1051 {
1052         krb5_error_code ret = 0;
1053         if (addr == NULL) {
1054                 return ret;
1055         }
1056 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1057         krb5_free_addresses(context, addr->addrs);
1058 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1059         ret = krb5_free_addresses(context, addr->addrs);
1060         SAFE_FREE(addr->addrs);
1061 #endif
1062         SAFE_FREE(addr);
1063         addr = NULL;
1064         return ret;
1065 }
1066
1067 #define MAX_NETBIOSNAME_LEN 16
1068  krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
1069                                                    const char *netbios_name)
1070 {
1071         krb5_error_code ret = 0;
1072         char buf[MAX_NETBIOSNAME_LEN];
1073         int len;
1074 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1075         krb5_address **addrs = NULL;
1076 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1077         krb5_addresses *addrs = NULL;
1078 #endif
1079
1080         *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1081         if (*kerb_addr == NULL) {
1082                 return ENOMEM;
1083         }
1084
1085         /* temporarily duplicate put_name() code here to avoid dependency
1086          * issues for a 5 lines function */
1087         len = strlen(netbios_name);
1088         memcpy(buf, netbios_name,
1089                 (len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
1090         if (len < MAX_NETBIOSNAME_LEN - 1) {
1091                 memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
1092         }
1093         buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
1094
1095 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1096         {
1097                 int num_addr = 2;
1098
1099                 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1100                 if (addrs == NULL) {
1101                         SAFE_FREE(*kerb_addr);
1102                         return ENOMEM;
1103                 }
1104
1105                 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1106
1107                 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1108                 if (addrs[0] == NULL) {
1109                         SAFE_FREE(addrs);
1110                         SAFE_FREE(*kerb_addr);
1111                         return ENOMEM;
1112                 }
1113
1114                 addrs[0]->magic = KV5M_ADDRESS;
1115                 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1116                 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1117                 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1118                 if (addrs[0]->contents == NULL) {
1119                         SAFE_FREE(addrs[0]);
1120                         SAFE_FREE(addrs);
1121                         SAFE_FREE(*kerb_addr);
1122                         return ENOMEM;
1123                 }
1124
1125                 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1126
1127                 addrs[1] = NULL;
1128         }
1129 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1130         {
1131                 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1132                 if (addrs == NULL) {
1133                         SAFE_FREE(*kerb_addr);
1134                         return ENOMEM;
1135                 }
1136
1137                 memset(addrs, 0, sizeof(krb5_addresses));
1138
1139                 addrs->len = 1;
1140                 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1141                 if (addrs->val == NULL) {
1142                         SAFE_FREE(addrs);
1143                         SAFE_FREE(kerb_addr);
1144                         return ENOMEM;
1145                 }
1146
1147                 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1148                 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1149                 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1150                 if (addrs->val[0].address.data == NULL) {
1151                         SAFE_FREE(addrs->val);
1152                         SAFE_FREE(addrs);
1153                         SAFE_FREE(*kerb_addr);
1154                         return ENOMEM;
1155                 }
1156
1157                 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1158         }
1159 #else
1160 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1161 #endif
1162         (*kerb_addr)->addrs = addrs;
1163
1164         return ret;
1165 }
1166
1167  void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1168 {
1169 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1170         krb5_free_error_contents(context, krberror);
1171 #else /* MIT */
1172         krb5_free_error(context, krberror);
1173 #endif
1174 }
1175
1176  krb5_error_code handle_krberror_packet(krb5_context context,
1177                                         krb5_data *packet)
1178 {
1179         krb5_error_code ret;
1180         bool got_error_code = false;
1181
1182         DEBUG(10,("handle_krberror_packet: got error packet\n"));
1183
1184 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1185         {
1186                 krb5_error krberror;
1187
1188                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1189                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1190                                 error_message(ret)));
1191                         return ret;
1192                 }
1193
1194                 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1195                         ret = (krb5_error_code) krberror.error_code;
1196                         got_error_code = true;
1197                 }
1198
1199                 smb_krb5_free_error(context, &krberror);
1200         }
1201 #else /* MIT */
1202         {
1203                 krb5_error *krberror;
1204
1205                 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1206                         DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1207                                 error_message(ret)));
1208                         return ret;
1209                 }
1210
1211                 if (krberror->e_data.data == NULL) {
1212 #if defined(ERROR_TABLE_BASE_krb5)
1213                         ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1214 #else
1215                         ret = (krb5_error_code)krberror->error;
1216 #endif
1217                         got_error_code = true;
1218                 }
1219                 smb_krb5_free_error(context, krberror);
1220         }
1221 #endif
1222         if (got_error_code) {
1223                 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1224                         error_message(ret), ret));
1225         }
1226         return ret;
1227 }
1228
1229 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1230                                             krb5_get_init_creds_opt **opt)
1231 {
1232         /* Heimdal or modern MIT version */
1233         return krb5_get_init_creds_opt_alloc(context, opt);
1234 }
1235
1236 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1237                                 krb5_get_init_creds_opt *opt)
1238 {
1239         /* Modern MIT or Heimdal version */
1240         krb5_get_init_creds_opt_free(context, opt);
1241 }
1242
1243 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1244 {
1245         return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1246 }
1247
1248 krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
1249                                         krb5_keytab_entry *kt_entry)
1250 {
1251 /* Try krb5_free_keytab_entry_contents first, since
1252  * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
1253  * krb5_kt_free_entry but only has a prototype for the first, while the
1254  * second is considered private.
1255  */
1256 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
1257         return krb5_free_keytab_entry_contents(context, kt_entry);
1258 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
1259         return krb5_kt_free_entry(context, kt_entry);
1260 #else
1261 #error UNKNOWN_KT_FREE_FUNCTION
1262 #endif
1263 }
1264
1265
1266 /* caller needs to free etype_s */
1267 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1268                                            krb5_enctype enctype,
1269                                            char **etype_s)
1270 {
1271 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1272         return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1273 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1274         char buf[256];
1275         krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1276         if (ret) {
1277                 return ret;
1278         }
1279         *etype_s = SMB_STRDUP(buf);
1280         if (!*etype_s) {
1281                 return ENOMEM;
1282         }
1283         return ret;
1284 #else
1285 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1286 #endif
1287 }
1288
1289 /**********************************************************************
1290  * Open a krb5 keytab with flags, handles readonly or readwrite access and
1291  * allows one to process non-default keytab names.
1292  * @param context krb5_context
1293  * @param keytab_name_req string
1294  * @param write_access bool if writable keytab is required
1295  * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1296  * @return krb5_error_code
1297 **********************************************************************/
1298
1299 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1300 #ifndef MAX_KEYTAB_NAME_LEN
1301 #define MAX_KEYTAB_NAME_LEN 1100
1302 #endif
1303
1304 krb5_error_code smb_krb5_open_keytab_relative(krb5_context context,
1305                                               const char *keytab_name_req,
1306                                               bool write_access,
1307                                               krb5_keytab *keytab)
1308 {
1309         krb5_error_code ret = 0;
1310         TALLOC_CTX *mem_ctx;
1311         char keytab_string[MAX_KEYTAB_NAME_LEN];
1312         char *kt_str = NULL;
1313         bool found_valid_name = false;
1314         const char *pragma = "FILE";
1315         const char *tmp = NULL;
1316
1317         if (!write_access && !keytab_name_req) {
1318                 /* caller just wants to read the default keytab readonly, so be it */
1319                 return krb5_kt_default(context, keytab);
1320         }
1321
1322         mem_ctx = talloc_init("smb_krb5_open_keytab");
1323         if (!mem_ctx) {
1324                 return ENOMEM;
1325         }
1326
1327 #ifdef HAVE_WRFILE_KEYTAB
1328         if (write_access) {
1329                 pragma = "WRFILE";
1330         }
1331 #endif
1332
1333         if (keytab_name_req) {
1334
1335                 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1336                         ret = KRB5_CONFIG_NOTENUFSPACE;
1337                         goto out;
1338                 }
1339
1340                 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1341                     (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1342                         tmp = keytab_name_req;
1343                         goto resolve;
1344                 }
1345
1346                 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1347                 if (!tmp) {
1348                         ret = ENOMEM;
1349                         goto out;
1350                 }
1351
1352                 goto resolve;
1353         }
1354
1355         /* we need to handle more complex keytab_strings, like:
1356          * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1357
1358         ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1359         if (ret) {
1360                 goto out;
1361         }
1362
1363         DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1364
1365         tmp = talloc_strdup(mem_ctx, keytab_string);
1366         if (!tmp) {
1367                 ret = ENOMEM;
1368                 goto out;
1369         }
1370
1371         if (strncmp(tmp, "ANY:", 4) == 0) {
1372                 tmp += 4;
1373         }
1374
1375         memset(&keytab_string, '\0', sizeof(keytab_string));
1376
1377         while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1378                 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1379                         found_valid_name = true;
1380                         tmp = kt_str;
1381                         tmp += 7;
1382                 }
1383
1384                 if (strncmp(kt_str, "FILE:", 5) == 0) {
1385                         found_valid_name = true;
1386                         tmp = kt_str;
1387                         tmp += 5;
1388                 }
1389
1390                 if (tmp[0] == '/') {
1391                         /* Treat as a FILE: keytab definition. */
1392                         found_valid_name = true;
1393                 }
1394
1395                 if (found_valid_name) {
1396                         if (tmp[0] != '/') {
1397                                 ret = KRB5_KT_BADNAME;
1398                                 goto out;
1399                         }
1400
1401                         tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1402                         if (!tmp) {
1403                                 ret = ENOMEM;
1404                                 goto out;
1405                         }
1406                         break;
1407                 }
1408         }
1409
1410         if (!found_valid_name) {
1411                 ret = KRB5_KT_UNKNOWN_TYPE;
1412                 goto out;
1413         }
1414
1415  resolve:
1416         DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1417         ret = krb5_kt_resolve(context, tmp, keytab);
1418
1419  out:
1420         TALLOC_FREE(mem_ctx);
1421         return ret;
1422 }
1423
1424 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1425                                      const char *keytab_name_req,
1426                                      bool write_access,
1427                                      krb5_keytab *keytab)
1428 {
1429         if (keytab_name_req != NULL) {
1430                 if (keytab_name_req[0] != '/') {
1431                         return KRB5_KT_BADNAME;
1432                 }
1433         }
1434
1435         return smb_krb5_open_keytab_relative(context,
1436                                              keytab_name_req,
1437                                              write_access,
1438                                              keytab);
1439 }
1440
1441 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1442                                      krb5_context context,
1443                                      krb5_keytab keytab,
1444                                      const char **keytab_name)
1445 {
1446         char keytab_string[MAX_KEYTAB_NAME_LEN];
1447         krb5_error_code ret = 0;
1448
1449         ret = krb5_kt_get_name(context, keytab,
1450                                keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1451         if (ret) {
1452                 return ret;
1453         }
1454
1455         *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1456         if (!*keytab_name) {
1457                 return ENOMEM;
1458         }
1459
1460         return ret;
1461 }
1462
1463 /**
1464  * @brief Seek and delete old entries in a keytab based on the passed
1465  *        principal.
1466  *
1467  * @param[in]  context       The KRB5 context to use.
1468  *
1469  * @param[in]  keytab        The keytab to operate on.
1470  *
1471  * @param[in]  kvno          The kvnco to use.
1472  *
1473  * @param[in]  princ_s       The principal as a string to search for.
1474  *
1475  * @param[in]  princ         The principal as a krb5_principal to search for.
1476  *
1477  * @param[in]  flush         Weather to flush the complete keytab.
1478  *
1479  * @param[in]  keep_old_entries Keep the entry with the previous kvno.
1480  *
1481  * @retval 0 on Sucess
1482  *
1483  * @return An appropriate KRB5 error code.
1484  */
1485 krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
1486                                                         krb5_keytab keytab,
1487                                                         krb5_kvno kvno,
1488                                                         const char *princ_s,
1489                                                         krb5_principal princ,
1490                                                         bool flush,
1491                                                         bool keep_old_entries)
1492 {
1493         krb5_error_code ret;
1494         krb5_kt_cursor cursor;
1495         krb5_kt_cursor zero_csr;
1496         krb5_keytab_entry kt_entry;
1497         krb5_keytab_entry zero_kt_entry;
1498         char *ktprinc = NULL;
1499         krb5_kvno old_kvno = kvno - 1;
1500         TALLOC_CTX *tmp_ctx;
1501
1502         ZERO_STRUCT(cursor);
1503         ZERO_STRUCT(zero_csr);
1504         ZERO_STRUCT(kt_entry);
1505         ZERO_STRUCT(zero_kt_entry);
1506
1507         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1508         if (ret == KRB5_KT_END || ret == ENOENT ) {
1509                 /* no entries */
1510                 return 0;
1511         }
1512
1513         tmp_ctx = talloc_new(NULL);
1514         if (tmp_ctx == NULL) {
1515                 return ENOMEM;
1516         }
1517
1518         DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
1519         while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
1520                 bool name_ok = false;
1521
1522                 if (!flush && (princ_s != NULL)) {
1523                         ret = smb_krb5_unparse_name(tmp_ctx, context,
1524                                                     kt_entry.principal,
1525                                                     &ktprinc);
1526                         if (ret) {
1527                                 DEBUG(1, (__location__
1528                                           ": smb_krb5_unparse_name failed "
1529                                           "(%s)\n", error_message(ret)));
1530                                 goto out;
1531                         }
1532
1533 #ifdef HAVE_KRB5_KT_COMPARE
1534                         name_ok = krb5_kt_compare(context, &kt_entry,
1535                                                   princ, 0, 0);
1536 #else
1537                         name_ok = (strcmp(ktprinc, princ_s) == 0);
1538 #endif
1539
1540                         if (!name_ok) {
1541                                 DEBUG(10, (__location__ ": ignoring keytab "
1542                                            "entry principal %s, kvno = %d\n",
1543                                            ktprinc, kt_entry.vno));
1544
1545                                 /* Not a match,
1546                                  * just free this entry and continue. */
1547                                 ret = smb_krb5_kt_free_entry(context,
1548                                                              &kt_entry);
1549                                 ZERO_STRUCT(kt_entry);
1550                                 if (ret) {
1551                                         DEBUG(1, (__location__
1552                                                   ": smb_krb5_kt_free_entry "
1553                                                   "failed (%s)\n",
1554                                                   error_message(ret)));
1555                                         goto out;
1556                                 }
1557
1558                                 TALLOC_FREE(ktprinc);
1559                                 continue;
1560                         }
1561
1562                         TALLOC_FREE(ktprinc);
1563                 }
1564
1565                 /*------------------------------------------------------------
1566                  * Save the entries with kvno - 1. This is what microsoft does
1567                  * to allow people with existing sessions that have kvno - 1
1568                  * to still work. Otherwise, when the password for the machine
1569                  * changes, all kerberizied sessions will 'break' until either
1570                  * the client reboots or the client's session key expires and
1571                  * they get a new session ticket with the new kvno.
1572                  * Some keytab files only store the kvno in 8bits, limit
1573                  * the compare accordingly.
1574                  */
1575
1576                 if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
1577                         DEBUG(5, (__location__ ": Saving previous (kvno %d) "
1578                                   "entry for principal: %s.\n",
1579                                   old_kvno, princ_s));
1580                         continue;
1581                 }
1582
1583                 if (keep_old_entries) {
1584                         DEBUG(5, (__location__ ": Saving old (kvno %d) "
1585                                   "entry for principal: %s.\n",
1586                                   kvno, princ_s));
1587                         continue;
1588                 }
1589
1590                 DEBUG(5, (__location__ ": Found old entry for principal: %s "
1591                           "(kvno %d) - trying to remove it.\n",
1592                           princ_s, kt_entry.vno));
1593
1594                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
1595                 ZERO_STRUCT(cursor);
1596                 if (ret) {
1597                         DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
1598                                   "failed (%s)\n", error_message(ret)));
1599                         goto out;
1600                 }
1601                 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
1602                 if (ret) {
1603                         DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1604                                   "failed (%s)\n", error_message(ret)));
1605                         goto out;
1606                 }
1607
1608                 DEBUG(5, (__location__ ": removed old entry for principal: "
1609                           "%s (kvno %d).\n", princ_s, kt_entry.vno));
1610
1611                 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
1612                 if (ret) {
1613                         DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
1614                                   "(%s)\n", error_message(ret)));
1615                         goto out;
1616                 }
1617                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
1618                 ZERO_STRUCT(kt_entry);
1619                 if (ret) {
1620                         DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
1621                                   "failed (%s)\n", error_message(ret)));
1622                         goto out;
1623                 }
1624         }
1625
1626 out:
1627         talloc_free(tmp_ctx);
1628         if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
1629                 smb_krb5_kt_free_entry(context, &kt_entry);
1630         }
1631         if (keytab) {
1632                 if (memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) {
1633                         krb5_kt_end_seq_get(context, keytab, &cursor);
1634                 }
1635         }
1636
1637         return ret;
1638 }
1639
1640 /**
1641  * @brief Add a keytab entry for the given principal
1642  *
1643  * @param[in]  context       The krb5 context to use.
1644  *
1645  * @param[in]  keytab        The keytab to add the entry to.
1646  *
1647  * @param[in]  kvno          The kvno to use.
1648  *
1649  * @param[in]  princ_s       The principal as a string.
1650  *
1651  * @param[in]  salt_principal The salt principal to salt the password with.
1652  *                            Only needed for keys which support salting.
1653  *                            If no salt is used set no_salt to false and
1654  *                            pass NULL here.
1655  *
1656  * @param[in]  enctype        The encryption type of the keytab entry.
1657  *
1658  * @param[in]  password       The password of the keytab entry.
1659  *
1660  * @param[in]  no_salt        If the password should not be salted. Normally
1661  *                            this is only set to false for encryption types
1662  *                            which do not support salting like RC4.
1663  *
1664  * @param[in]  keep_old_entries Wether to keep or delte old keytab entries.
1665  *
1666  * @retval 0 on Success
1667  *
1668  * @return A corresponding KRB5 error code.
1669  *
1670  * @see smb_krb5_open_keytab()
1671  */
1672 krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
1673                                       krb5_keytab keytab,
1674                                       krb5_kvno kvno,
1675                                       const char *princ_s,
1676                                       const char *salt_principal,
1677                                       krb5_enctype enctype,
1678                                       krb5_data *password,
1679                                       bool no_salt,
1680                                       bool keep_old_entries)
1681 {
1682         krb5_error_code ret;
1683         krb5_keytab_entry kt_entry;
1684         krb5_principal princ = NULL;
1685         krb5_keyblock *keyp;
1686
1687         ZERO_STRUCT(kt_entry);
1688
1689         ret = smb_krb5_parse_name(context, princ_s, &princ);
1690         if (ret) {
1691                 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
1692                           "failed (%s)\n", princ_s, error_message(ret)));
1693                 goto out;
1694         }
1695
1696         /* Seek and delete old keytab entries */
1697         ret = smb_krb5_kt_seek_and_delete_old_entries(context,
1698                                                       keytab,
1699                                                       kvno,
1700                                                       princ_s,
1701                                                       princ,
1702                                                       false,
1703                                                       keep_old_entries);
1704         if (ret) {
1705                 goto out;
1706         }
1707
1708         /* If we get here, we have deleted all the old entries with kvno's
1709          * not equal to the current kvno-1. */
1710
1711         keyp = KRB5_KT_KEY(&kt_entry);
1712
1713         if (no_salt) {
1714                 KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
1715                 if (KRB5_KEY_DATA(keyp) == NULL) {
1716                         ret = ENOMEM;
1717                         goto out;
1718                 }
1719                 memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
1720                 KRB5_KEY_LENGTH(keyp) = password->length;
1721                 KRB5_KEY_TYPE(keyp) = enctype;
1722         } else {
1723                 krb5_principal salt_princ = NULL;
1724
1725                 /* Now add keytab entries for all encryption types */
1726                 ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
1727                 if (ret) {
1728                         DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
1729                                     salt_principal, error_message(ret));
1730                         goto out;
1731                 }
1732
1733                 ret = smb_krb5_create_key_from_string(context,
1734                                                       salt_princ,
1735                                                       NULL,
1736                                                       password,
1737                                                       enctype,
1738                                                       keyp);
1739                 krb5_free_principal(context, salt_princ);
1740                 if (ret != 0) {
1741                         goto out;
1742                 }
1743         }
1744
1745         kt_entry.principal = princ;
1746         kt_entry.vno       = kvno;
1747
1748         DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
1749                   "encryption type (%d) and version (%d)\n",
1750                   princ_s, enctype, kt_entry.vno));
1751         ret = krb5_kt_add_entry(context, keytab, &kt_entry);
1752         krb5_free_keyblock_contents(context, keyp);
1753         ZERO_STRUCT(kt_entry);
1754         if (ret) {
1755                 DEBUG(1, (__location__ ": adding entry to keytab "
1756                           "failed (%s)\n", error_message(ret)));
1757                 goto out;
1758         }
1759
1760 out:
1761         if (princ) {
1762                 krb5_free_principal(context, princ);
1763         }
1764
1765         return ret;
1766 }
1767
1768 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1769     defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1770     defined(HAVE_KRB5_GET_CREDS)
1771 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1772                                                              krb5_ccache ccache,
1773                                                              krb5_principal me,
1774                                                              krb5_principal server,
1775                                                              krb5_principal impersonate_princ,
1776                                                              krb5_creds **out_creds)
1777 {
1778         krb5_error_code ret;
1779         krb5_get_creds_opt opt;
1780
1781         ret = krb5_get_creds_opt_alloc(context, &opt);
1782         if (ret) {
1783                 goto done;
1784         }
1785         krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1786
1787         if (impersonate_princ) {
1788                 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1789                                                          impersonate_princ);
1790                 if (ret) {
1791                         goto done;
1792                 }
1793         }
1794
1795         ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1796         if (ret) {
1797                 goto done;
1798         }
1799
1800  done:
1801         if (opt) {
1802                 krb5_get_creds_opt_free(context, opt);
1803         }
1804         return ret;
1805 }
1806 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1807
1808 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1809
1810 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1811 krb5_error_code KRB5_CALLCONV
1812 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1813                               krb5_ccache ccache, krb5_creds *in_creds,
1814                               krb5_data *subject_cert,
1815                               krb5_creds **out_creds);
1816 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1817
1818 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1819                                                          krb5_ccache ccache,
1820                                                          krb5_principal me,
1821                                                          krb5_principal server,
1822                                                          krb5_principal impersonate_princ,
1823                                                          krb5_creds **out_creds)
1824 {
1825         krb5_error_code ret;
1826         krb5_creds in_creds;
1827
1828         ZERO_STRUCT(in_creds);
1829
1830         if (impersonate_princ) {
1831
1832                 in_creds.server = me;
1833                 in_creds.client = impersonate_princ;
1834
1835                 ret = krb5_get_credentials_for_user(context,
1836                                                     0, /* krb5_flags options */
1837                                                     ccache,
1838                                                     &in_creds,
1839                                                     NULL, /* krb5_data *subject_cert */
1840                                                     out_creds);
1841         } else {
1842                 in_creds.client = me;
1843                 in_creds.server = server;
1844
1845                 ret = krb5_get_credentials(context, 0, ccache,
1846                                            &in_creds, out_creds);
1847         }
1848
1849         return ret;
1850 }
1851 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1852
1853 /*
1854  * smb_krb5_get_credentials
1855  *
1856  * @brief Get krb5 credentials for a server
1857  *
1858  * @param[in] context           An initialized krb5_context
1859  * @param[in] ccache            An initialized krb5_ccache
1860  * @param[in] me                The krb5_principal of the caller
1861  * @param[in] server            The krb5_principal of the requested service
1862  * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1863  * @param[out] out_creds        The returned krb5_creds structure
1864  * @return krb5_error_code
1865  *
1866  */
1867 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1868                                          krb5_ccache ccache,
1869                                          krb5_principal me,
1870                                          krb5_principal server,
1871                                          krb5_principal impersonate_princ,
1872                                          krb5_creds **out_creds)
1873 {
1874         krb5_error_code ret;
1875         krb5_creds *creds = NULL;
1876
1877         if (out_creds != NULL) {
1878                 *out_creds = NULL;
1879         }
1880
1881         if (impersonate_princ) {
1882 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
1883                 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
1884 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
1885                 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
1886 #else
1887                 ret = ENOTSUP;
1888 #endif
1889         } else {
1890                 krb5_creds in_creds;
1891
1892                 ZERO_STRUCT(in_creds);
1893
1894                 in_creds.client = me;
1895                 in_creds.server = server;
1896
1897                 ret = krb5_get_credentials(context, 0, ccache,
1898                                            &in_creds, &creds);
1899         }
1900         if (ret) {
1901                 goto done;
1902         }
1903
1904         if (out_creds) {
1905                 *out_creds = creds;
1906         }
1907
1908  done:
1909         if (creds && ret) {
1910                 krb5_free_creds(context, creds);
1911         }
1912
1913         return ret;
1914 }
1915
1916 krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
1917                                                 krb5_enctype enctype,
1918                                                 const void *data,
1919                                                 size_t length,
1920                                                 krb5_keyblock *key)
1921 {
1922 #if defined(HAVE_KRB5_KEYBLOCK_INIT)
1923         return krb5_keyblock_init(context, enctype, data, length, key);
1924 #else
1925         memset(key, 0, sizeof(krb5_keyblock));
1926         KRB5_KEY_DATA(key) = SMB_MALLOC(length);
1927         if (NULL == KRB5_KEY_DATA(key)) {
1928                 return ENOMEM;
1929         }
1930         memcpy(KRB5_KEY_DATA(key), data, length);
1931         KRB5_KEY_LENGTH(key) = length;
1932         KRB5_KEY_TYPE(key) = enctype;
1933         return 0;
1934 #endif
1935 }
1936
1937 /*
1938   simulate a kinit, putting the tgt in the given credentials cache.
1939   Orignally by remus@snapserver.com
1940
1941   This version is built to use a keyblock, rather than needing the
1942   original password.
1943
1944   The impersonate_principal is the principal if NULL, or the principal
1945   to impersonate
1946
1947   The target_service defaults to the krbtgt if NULL, but could be
1948    kpasswd/realm or the local service (if we are doing s4u2self)
1949 */
1950 krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
1951                                            krb5_principal principal,
1952                                            krb5_keyblock *keyblock,
1953                                            const char *target_service,
1954                                            krb5_get_init_creds_opt *krb_options,
1955                                            time_t *expire_time,
1956                                            time_t *kdc_time)
1957 {
1958         krb5_error_code code = 0;
1959         krb5_creds my_creds;
1960
1961 #if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
1962         code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
1963                                             keyblock, 0, target_service,
1964                                             krb_options);
1965 #elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
1966 {
1967 #define SMB_CREDS_KEYTAB "MEMORY:tmp_smb_creds_XXXXXX"
1968         char tmp_name[sizeof(SMB_CREDS_KEYTAB)];
1969         krb5_keytab_entry entry;
1970         krb5_keytab keytab;
1971         mode_t mask;
1972
1973         memset(&entry, 0, sizeof(entry));
1974         entry.principal = principal;
1975         *(KRB5_KT_KEY(&entry)) = *keyblock;
1976
1977         memcpy(tmp_name, SMB_CREDS_KEYTAB, sizeof(SMB_CREDS_KEYTAB));
1978         mask = umask(S_IRWXO | S_IRWXG);
1979         mktemp(tmp_name);
1980         umask(mask);
1981         if (tmp_name[0] == 0) {
1982                 return KRB5_KT_BADNAME;
1983         }
1984         code = krb5_kt_resolve(ctx, tmp_name, &keytab);
1985         if (code) {
1986                 return code;
1987         }
1988
1989         code = krb5_kt_add_entry(ctx, keytab, &entry);
1990         if (code) {
1991                 (void)krb5_kt_close(ctx, keytab);
1992                 goto done;
1993         }
1994
1995         code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
1996                                           keytab, 0, target_service,
1997                                           krb_options);
1998         (void)krb5_kt_close(ctx, keytab);
1999 }
2000 #else
2001 #error krb5_get_init_creds_keyblock not available!
2002 #endif
2003         if (code) {
2004                 return code;
2005         }
2006
2007         code = krb5_cc_initialize(ctx, cc, principal);
2008         if (code) {
2009                 goto done;
2010         }
2011
2012         code = krb5_cc_store_cred(ctx, cc, &my_creds);
2013         if (code) {
2014                 goto done;
2015         }
2016
2017         if (expire_time) {
2018                 *expire_time = (time_t) my_creds.times.endtime;
2019         }
2020
2021         if (kdc_time) {
2022                 *kdc_time = (time_t) my_creds.times.starttime;
2023         }
2024
2025         code = 0;
2026 done:
2027         krb5_free_cred_contents(ctx, &my_creds);
2028         return code;
2029 }
2030
2031 krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
2032                                            krb5_principal principal,
2033                                            const char *password,
2034                                            const char *target_service,
2035                                            krb5_get_init_creds_opt *krb_options,
2036                                            time_t *expire_time,
2037                                            time_t *kdc_time)
2038 {
2039         krb5_error_code code = 0;
2040         krb5_creds my_creds;
2041
2042         code = krb5_get_init_creds_password(ctx, &my_creds, principal,
2043                                             password, NULL, NULL, 0,
2044                                             target_service, krb_options);
2045         if (code) {
2046                 return code;
2047         }
2048
2049 #ifndef SAMBA4_USES_HEIMDAL /* MIT */
2050         /*
2051          * We need to store the principal as returned from the KDC to the
2052          * credentials cache. If we don't do that the KRB5 library is not
2053          * able to find the tickets it is looking for
2054          */
2055         principal = my_creds.client;
2056 #endif
2057         code = krb5_cc_initialize(ctx, cc, principal);
2058         if (code) {
2059                 goto done;
2060         }
2061
2062         code = krb5_cc_store_cred(ctx, cc, &my_creds);
2063         if (code) {
2064                 goto done;
2065         }
2066
2067         if (expire_time) {
2068                 *expire_time = (time_t) my_creds.times.endtime;
2069         }
2070
2071         if (kdc_time) {
2072                 *kdc_time = (time_t) my_creds.times.starttime;
2073         }
2074
2075         code = 0;
2076 done:
2077         krb5_free_cred_contents(ctx, &my_creds);
2078         return code;
2079 }
2080
2081 #ifdef SAMBA4_USES_HEIMDAL
2082 /*
2083   simulate a kinit, putting the tgt in the given credentials cache.
2084   Orignally by remus@snapserver.com
2085
2086   The impersonate_principal is the principal
2087
2088   The self_service, should be the local service (for S4U2Self if
2089   impersonate_principal is given).
2090
2091   The target_service defaults to the krbtgt if NULL, but could be
2092   kpasswd/realm or a remote service (for S4U2Proxy)
2093
2094 */
2095 krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
2096                                         krb5_ccache store_cc,
2097                                         krb5_principal init_principal,
2098                                         const char *init_password,
2099                                         krb5_principal impersonate_principal,
2100                                         const char *self_service,
2101                                         const char *target_service,
2102                                         krb5_get_init_creds_opt *krb_options,
2103                                         time_t *expire_time,
2104                                         time_t *kdc_time)
2105 {
2106         krb5_error_code code = 0;
2107         krb5_get_creds_opt options;
2108         krb5_principal store_principal;
2109         krb5_creds store_creds;
2110         krb5_creds *s4u2self_creds;
2111         Ticket s4u2self_ticket;
2112         size_t s4u2self_ticketlen;
2113         krb5_creds *s4u2proxy_creds;
2114         krb5_principal self_princ;
2115         bool s4u2proxy;
2116         krb5_principal target_princ;
2117         krb5_ccache tmp_cc;
2118         const char *self_realm;
2119         krb5_principal blacklist_principal = NULL;
2120         krb5_principal whitelist_principal = NULL;
2121
2122         code = krb5_get_init_creds_password(ctx, &store_creds,
2123                                             init_principal,
2124                                             init_password,
2125                                             NULL, NULL,
2126                                             0,
2127                                             NULL,
2128                                             krb_options);
2129         if (code != 0) {
2130                 return code;
2131         }
2132
2133         store_principal = init_principal;
2134
2135         /*
2136          * We are trying S4U2Self now:
2137          *
2138          * As we do not want to expose our TGT in the
2139          * krb5_ccache, which is also holds the impersonated creds.
2140          *
2141          * Some low level krb5/gssapi function might use the TGT
2142          * identity and let the client act as our machine account.
2143          *
2144          * We need to avoid that and use a temporary krb5_ccache
2145          * in order to pass our TGT to the krb5_get_creds() function.
2146          */
2147         code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
2148         if (code != 0) {
2149                 krb5_free_cred_contents(ctx, &store_creds);
2150                 return code;
2151         }
2152
2153         code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
2154         if (code != 0) {
2155                 krb5_cc_destroy(ctx, tmp_cc);
2156                 krb5_free_cred_contents(ctx, &store_creds);
2157                 return code;
2158         }
2159
2160         code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
2161         if (code != 0) {
2162                 krb5_free_cred_contents(ctx, &store_creds);
2163                 krb5_cc_destroy(ctx, tmp_cc);
2164                 return code;
2165         }
2166
2167         /*
2168          * we need to remember the client principal of our
2169          * TGT and make sure the KDC does not return this
2170          * in the impersonated tickets. This can happen
2171          * if the KDC does not support S4U2Self and S4U2Proxy.
2172          */
2173         blacklist_principal = store_creds.client;
2174         store_creds.client = NULL;
2175         krb5_free_cred_contents(ctx, &store_creds);
2176
2177         /*
2178          * Check if we also need S4U2Proxy or if S4U2Self is
2179          * enough in order to get a ticket for the target.
2180          */
2181         if (target_service == NULL) {
2182                 s4u2proxy = false;
2183         } else if (strcmp(target_service, self_service) == 0) {
2184                 s4u2proxy = false;
2185         } else {
2186                 s4u2proxy = true;
2187         }
2188
2189         /*
2190          * For S4U2Self we need our own service principal,
2191          * which belongs to our own realm (available on
2192          * our client principal).
2193          */
2194         self_realm = krb5_principal_get_realm(ctx, init_principal);
2195
2196         code = krb5_parse_name(ctx, self_service, &self_princ);
2197         if (code != 0) {
2198                 krb5_free_principal(ctx, blacklist_principal);
2199                 krb5_cc_destroy(ctx, tmp_cc);
2200                 return code;
2201         }
2202
2203         code = krb5_principal_set_realm(ctx, self_princ, self_realm);
2204         if (code != 0) {
2205                 krb5_free_principal(ctx, blacklist_principal);
2206                 krb5_free_principal(ctx, self_princ);
2207                 krb5_cc_destroy(ctx, tmp_cc);
2208                 return code;
2209         }
2210
2211         code = krb5_get_creds_opt_alloc(ctx, &options);
2212         if (code != 0) {
2213                 krb5_free_principal(ctx, blacklist_principal);
2214                 krb5_free_principal(ctx, self_princ);
2215                 krb5_cc_destroy(ctx, tmp_cc);
2216                 return code;
2217         }
2218
2219         if (s4u2proxy) {
2220                 /*
2221                  * If we want S4U2Proxy, we need the forwardable flag
2222                  * on the S4U2Self ticket.
2223                  */
2224                 krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2225         }
2226
2227         code = krb5_get_creds_opt_set_impersonate(ctx, options,
2228                                                   impersonate_principal);
2229         if (code != 0) {
2230                 krb5_get_creds_opt_free(ctx, options);
2231                 krb5_free_principal(ctx, blacklist_principal);
2232                 krb5_free_principal(ctx, self_princ);
2233                 krb5_cc_destroy(ctx, tmp_cc);
2234                 return code;
2235         }
2236
2237         code = krb5_get_creds(ctx, options, tmp_cc,
2238                               self_princ, &s4u2self_creds);
2239         krb5_get_creds_opt_free(ctx, options);
2240         krb5_free_principal(ctx, self_princ);
2241         if (code != 0) {
2242                 krb5_free_principal(ctx, blacklist_principal);
2243                 krb5_cc_destroy(ctx, tmp_cc);
2244                 return code;
2245         }
2246
2247         if (!s4u2proxy) {
2248                 krb5_cc_destroy(ctx, tmp_cc);
2249
2250                 /*
2251                  * Now make sure we store the impersonated principal
2252                  * and creds instead of the TGT related stuff
2253                  * in the krb5_ccache of the caller.
2254                  */
2255                 code = krb5_copy_creds_contents(ctx, s4u2self_creds,
2256                                                 &store_creds);
2257                 krb5_free_creds(ctx, s4u2self_creds);
2258                 if (code != 0) {
2259                         return code;
2260                 }
2261
2262                 /*
2263                  * It's important to store the principal the KDC
2264                  * returned, as otherwise the caller would not find
2265                  * the S4U2Self ticket in the krb5_ccache lookup.
2266                  */
2267                 store_principal = store_creds.client;
2268                 goto store;
2269         }
2270
2271         /*
2272          * We are trying S4U2Proxy:
2273          *
2274          * We need the ticket from the S4U2Self step
2275          * and our TGT in order to get the delegated ticket.
2276          */
2277         code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
2278                              s4u2self_creds->ticket.length,
2279                              &s4u2self_ticket,
2280                              &s4u2self_ticketlen);
2281         if (code != 0) {
2282                 krb5_free_creds(ctx, s4u2self_creds);
2283                 krb5_free_principal(ctx, blacklist_principal);
2284                 krb5_cc_destroy(ctx, tmp_cc);
2285                 return code;
2286         }
2287
2288         /*
2289          * we need to remember the client principal of the
2290          * S4U2Self stage and as it needs to match the one we
2291          * will get for the S4U2Proxy stage. We need this
2292          * in order to detect KDCs which does not support S4U2Proxy.
2293          */
2294         whitelist_principal = s4u2self_creds->client;
2295         s4u2self_creds->client = NULL;
2296         krb5_free_creds(ctx, s4u2self_creds);
2297
2298         /*
2299          * For S4U2Proxy we also got a target service principal,
2300          * which also belongs to our own realm (available on
2301          * our client principal).
2302          */
2303         code = krb5_parse_name(ctx, target_service, &target_princ);
2304         if (code != 0) {
2305                 free_Ticket(&s4u2self_ticket);
2306                 krb5_free_principal(ctx, whitelist_principal);
2307                 krb5_free_principal(ctx, blacklist_principal);
2308                 krb5_cc_destroy(ctx, tmp_cc);
2309                 return code;
2310         }
2311
2312         code = krb5_principal_set_realm(ctx, target_princ, self_realm);
2313         if (code != 0) {
2314                 free_Ticket(&s4u2self_ticket);
2315                 krb5_free_principal(ctx, target_princ);
2316                 krb5_free_principal(ctx, whitelist_principal);
2317                 krb5_free_principal(ctx, blacklist_principal);
2318                 krb5_cc_destroy(ctx, tmp_cc);
2319                 return code;
2320         }
2321
2322         code = krb5_get_creds_opt_alloc(ctx, &options);
2323         if (code != 0) {
2324                 free_Ticket(&s4u2self_ticket);
2325                 krb5_free_principal(ctx, target_princ);
2326                 krb5_free_principal(ctx, whitelist_principal);
2327                 krb5_free_principal(ctx, blacklist_principal);
2328                 krb5_cc_destroy(ctx, tmp_cc);
2329                 return code;
2330         }
2331
2332         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
2333         krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
2334
2335         code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
2336         free_Ticket(&s4u2self_ticket);
2337         if (code != 0) {
2338                 krb5_get_creds_opt_free(ctx, options);
2339                 krb5_free_principal(ctx, target_princ);
2340                 krb5_free_principal(ctx, whitelist_principal);
2341                 krb5_free_principal(ctx, blacklist_principal);
2342                 krb5_cc_destroy(ctx, tmp_cc);
2343                 return code;
2344         }
2345
2346         code = krb5_get_creds(ctx, options, tmp_cc,
2347                               target_princ, &s4u2proxy_creds);
2348         krb5_get_creds_opt_free(ctx, options);
2349         krb5_free_principal(ctx, target_princ);
2350         krb5_cc_destroy(ctx, tmp_cc);
2351         if (code != 0) {
2352                 krb5_free_principal(ctx, whitelist_principal);
2353                 krb5_free_principal(ctx, blacklist_principal);
2354                 return code;
2355         }
2356
2357         /*
2358          * Now make sure we store the impersonated principal
2359          * and creds instead of the TGT related stuff
2360          * in the krb5_ccache of the caller.
2361          */
2362         code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
2363                                         &store_creds);
2364         krb5_free_creds(ctx, s4u2proxy_creds);
2365         if (code != 0) {
2366                 krb5_free_principal(ctx, whitelist_principal);
2367                 krb5_free_principal(ctx, blacklist_principal);
2368                 return code;
2369         }
2370
2371         /*
2372          * It's important to store the principal the KDC
2373          * returned, as otherwise the caller would not find
2374          * the S4U2Self ticket in the krb5_ccache lookup.
2375          */
2376         store_principal = store_creds.client;
2377
2378  store:
2379         if (blacklist_principal &&
2380             krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
2381                 char *sp = NULL;
2382                 char *ip = NULL;
2383
2384                 code = krb5_unparse_name(ctx, blacklist_principal, &sp);
2385                 if (code != 0) {
2386                         sp = NULL;
2387                 }
2388                 code = krb5_unparse_name(ctx, impersonate_principal, &ip);
2389                 if (code != 0) {
2390                         ip = NULL;
2391                 }
2392                 DEBUG(1, ("kerberos_kinit_password_cc: "
2393                           "KDC returned self principal[%s] while impersonating [%s]\n",
2394                           sp?sp:"<no memory>",
2395                           ip?ip:"<no memory>"));
2396
2397                 SAFE_FREE(sp);
2398                 SAFE_FREE(ip);
2399
2400                 krb5_free_principal(ctx, whitelist_principal);
2401                 krb5_free_principal(ctx, blacklist_principal);
2402                 krb5_free_cred_contents(ctx, &store_creds);
2403                 return KRB5_FWD_BAD_PRINCIPAL;
2404         }
2405         if (blacklist_principal) {
2406                 krb5_free_principal(ctx, blacklist_principal);
2407         }
2408
2409         if (whitelist_principal &&
2410             !krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
2411                 char *sp = NULL;
2412                 char *ep = NULL;
2413
2414                 code = krb5_unparse_name(ctx, store_creds.client, &sp);
2415                 if (code != 0) {
2416                         sp = NULL;
2417                 }
2418                 code = krb5_unparse_name(ctx, whitelist_principal, &ep);
2419                 if (code != 0) {
2420                         ep = NULL;
2421                 }
2422                 DEBUG(1, ("kerberos_kinit_password_cc: "
2423                           "KDC returned wrong principal[%s] we expected [%s]\n",
2424                           sp?sp:"<no memory>",
2425                           ep?ep:"<no memory>"));
2426
2427                 SAFE_FREE(sp);
2428                 SAFE_FREE(ep);
2429
2430                 krb5_free_principal(ctx, whitelist_principal);
2431                 krb5_free_cred_contents(ctx, &store_creds);
2432                 return KRB5_FWD_BAD_PRINCIPAL;
2433         }
2434         if (whitelist_principal) {
2435                 krb5_free_principal(ctx, whitelist_principal);
2436         }
2437
2438         code = krb5_cc_initialize(ctx, store_cc, store_principal);
2439         if (code != 0) {
2440                 krb5_free_cred_contents(ctx, &store_creds);
2441                 return code;
2442         }
2443
2444         code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
2445         if (code != 0) {
2446                 krb5_free_cred_contents(ctx, &store_creds);
2447                 return code;
2448         }
2449
2450         if (expire_time) {
2451                 *expire_time = (time_t) store_creds.times.endtime;
2452         }
2453
2454         if (kdc_time) {
2455                 *kdc_time = (time_t) store_creds.times.starttime;
2456         }
2457
2458         krb5_free_cred_contents(ctx, &store_creds);
2459
2460         return 0;
2461 }
2462 #endif
2463
2464 #if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
2465 krb5_error_code smb_krb5_make_principal(krb5_context context,
2466                                         krb5_principal *principal,
2467                                         const char *_realm, ...)
2468 {
2469         krb5_error_code code;
2470         bool free_realm;
2471         char *realm;
2472         va_list ap;
2473
2474         if (_realm) {
2475                 realm = discard_const_p(char, _realm);
2476                 free_realm = false;
2477         } else {
2478                 code = krb5_get_default_realm(context, &realm);
2479                 if (code) {
2480                         return code;
2481                 }
2482                 free_realm = true;
2483         }
2484
2485         va_start(ap, _realm);
2486         code = krb5_build_principal_alloc_va(context, principal,
2487                                              strlen(realm), realm,
2488                                              ap);
2489         va_end(ap);
2490
2491         if (free_realm) {
2492                 krb5_free_default_realm(context, realm);
2493         }
2494
2495         return code;
2496 }
2497 #endif
2498
2499 #if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
2500 /**
2501  * @brief Get the lifetime of the initial ticket in the cache.
2502  *
2503  * @param[in]  context  The kerberos context.
2504  *
2505  * @param[in]  id       The credential cache to get the ticket lifetime.
2506  *
2507  * @param[out] t        A pointer to a time value to store the lifetime.
2508  *
2509  * @return              0 on success, a krb5_error_code on error.
2510  */
2511 krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
2512                                          krb5_ccache id,
2513                                          time_t *t)
2514 {
2515         krb5_cc_cursor cursor;
2516         krb5_error_code kerr;
2517         krb5_creds cred;
2518         krb5_timestamp now;
2519
2520         *t = 0;
2521
2522         kerr = krb5_timeofday(context, &now);
2523         if (kerr) {
2524                 return kerr;
2525         }
2526
2527         kerr = krb5_cc_start_seq_get(context, id, &cursor);
2528         if (kerr) {
2529                 return kerr;
2530         }
2531
2532         while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
2533 #ifndef HAVE_FLAGS_IN_KRB5_CREDS
2534                 if (cred.ticket_flags & TKT_FLG_INITIAL) {
2535 #else
2536                 if (cred.flags.b.initial) {
2537 #endif
2538                         if (now < cred.times.endtime) {
2539                                 *t = (time_t) (cred.times.endtime - now);
2540                         }
2541                         krb5_free_cred_contents(context, &cred);
2542                         break;
2543                 }
2544                 krb5_free_cred_contents(context, &cred);
2545         }
2546
2547         krb5_cc_end_seq_get(context, id, &cursor);
2548
2549         return kerr;
2550 }
2551 #endif /* HAVE_KRB5_CC_GET_LIFETIME */
2552
2553 #if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
2554 void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
2555 {
2556         free_Checksum(cksum);
2557 }
2558 #endif
2559
2560 krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
2561                                            DATA_BLOB *pac_data,
2562                                            krb5_context context,
2563                                            const krb5_keyblock *keyblock,
2564                                            uint32_t *sig_type,
2565                                            DATA_BLOB *sig_blob)
2566 {
2567         krb5_error_code ret;
2568         krb5_checksum cksum;
2569 #if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
2570         krb5_crypto crypto;
2571
2572
2573         ret = krb5_crypto_init(context,
2574                                keyblock,
2575                                0,
2576                                &crypto);
2577         if (ret) {
2578                 DEBUG(0,("krb5_crypto_init() failed: %s\n",
2579                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2580                 return ret;
2581         }
2582         ret = krb5_create_checksum(context,
2583                                    crypto,
2584                                    KRB5_KU_OTHER_CKSUM,
2585                                    0,
2586                                    pac_data->data,
2587                                    pac_data->length,
2588                                    &cksum);
2589         if (ret) {
2590                 DEBUG(2, ("PAC Verification failed: %s\n",
2591                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2592         }
2593
2594         krb5_crypto_destroy(context, crypto);
2595
2596         if (ret) {
2597                 return ret;
2598         }
2599
2600         *sig_type = cksum.cksumtype;
2601         *sig_blob = data_blob_talloc(mem_ctx,
2602                                         cksum.checksum.data,
2603                                         cksum.checksum.length);
2604 #elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
2605         krb5_data input;
2606
2607         input.data = (char *)pac_data->data;
2608         input.length = pac_data->length;
2609
2610         ret = krb5_c_make_checksum(context,
2611                                    0,
2612                                    keyblock,
2613                                    KRB5_KEYUSAGE_APP_DATA_CKSUM,
2614                                    &input,
2615                                    &cksum);
2616         if (ret) {
2617                 DEBUG(2, ("PAC Verification failed: %s\n",
2618                           smb_get_krb5_error_message(context, ret, mem_ctx)));
2619                 return ret;
2620         }
2621
2622         *sig_type = cksum.checksum_type;
2623         *sig_blob = data_blob_talloc(mem_ctx,
2624                                         cksum.contents,
2625                                         cksum.length);
2626
2627 #else
2628 #error krb5_create_checksum or krb5_c_make_checksum not available
2629 #endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
2630         smb_krb5_free_checksum_contents(context, &cksum);
2631
2632         return 0;
2633 }
2634
2635
2636 /*
2637  * smb_krb5_principal_get_realm
2638  *
2639  * @brief Get realm of a principal
2640  *
2641  * @param[in] context           The krb5_context
2642  * @param[in] principal         The principal
2643  * @return pointer to the realm
2644  *
2645  * Caller must free if the return value is not NULL.
2646  *
2647  */
2648
2649 char *smb_krb5_principal_get_realm(krb5_context context,
2650                                    krb5_const_principal principal)
2651 {
2652 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2653         return strdup(discard_const_p(char, krb5_principal_get_realm(context, principal)));
2654 #elif defined(krb5_princ_realm) /* MIT */
2655         krb5_data *realm;
2656         realm = discard_const_p(krb5_data,
2657                                 krb5_princ_realm(context, principal));
2658         return strndup(realm->data, realm->length);
2659 #else
2660 #error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
2661 #endif
2662 }
2663
2664 /*
2665  * smb_krb5_principal_set_realm
2666  *
2667  * @brief Get realm of a principal
2668  *
2669  * @param[in] context           The krb5_context
2670  * @param[in] principal         The principal
2671  * @param[in] realm             The realm
2672  * @return                      0 on success, a krb5_error_code on error.
2673  *
2674  */
2675
2676 krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
2677                                              krb5_principal principal,
2678                                              const char *realm)
2679 {
2680 #ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
2681         return krb5_principal_set_realm(context, principal, realm);
2682 #elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
2683         krb5_error_code ret;
2684         krb5_data data;
2685         krb5_data *old_data;
2686
2687         old_data = krb5_princ_realm(context, principal);
2688
2689         ret = krb5_copy_data_contents(&data,
2690                                       realm,
2691                                       strlen(realm));
2692         if (ret) {
2693                 return ret;
2694         }
2695
2696         /* free realm before setting */
2697         free(old_data->data);
2698
2699         krb5_princ_set_realm(context, principal, &data);
2700
2701         return ret;
2702 #else
2703 #error UNKNOWN_PRINC_SET_REALM_FUNCTION
2704 #endif
2705 }
2706
2707
2708 /************************************************************************
2709  Routine to get the default realm from the kerberos credentials cache.
2710  Caller must free if the return value is not NULL.
2711 ************************************************************************/
2712
2713 static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
2714 {
2715         char *realm = NULL;
2716         krb5_context ctx = NULL;
2717         krb5_ccache cc = NULL;
2718         krb5_principal princ = NULL;
2719
2720         initialize_krb5_error_table();
2721         if (krb5_init_context(&ctx)) {
2722                 return NULL;
2723         }
2724
2725         DEBUG(5,("kerberos_get_default_realm_from_ccache: "
2726                 "Trying to read krb5 cache: %s\n",
2727                 krb5_cc_default_name(ctx)));
2728         if (krb5_cc_default(ctx, &cc)) {
2729                 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2730                         "failed to read default cache\n"));
2731                 goto out;
2732         }
2733         if (krb5_cc_get_principal(ctx, cc, &princ)) {
2734                 DEBUG(0,("kerberos_get_default_realm_from_ccache: "
2735                         "failed to get default principal\n"));
2736                 goto out;
2737         }
2738
2739 #if defined(HAVE_KRB5_PRINCIPAL_GET_REALM)
2740         realm = talloc_strdup(mem_ctx, krb5_principal_get_realm(ctx, princ));
2741 #elif defined(HAVE_KRB5_PRINC_REALM)
2742         {
2743                 krb5_data *realm_data = krb5_princ_realm(ctx, princ);
2744                 realm = talloc_strndup(mem_ctx, realm_data->data, realm_data->length);
2745         }
2746 #endif
2747
2748   out:
2749
2750         if (ctx) {
2751                 if (princ) {
2752                         krb5_free_principal(ctx, princ);
2753                 }
2754                 if (cc) {
2755                         krb5_cc_close(ctx, cc);
2756                 }
2757                 krb5_free_context(ctx);
2758         }
2759
2760         return realm;
2761 }
2762
2763 /************************************************************************
2764  Routine to get the realm from a given DNS name.
2765 ************************************************************************/
2766
2767 static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
2768                                                 const char *hostname)
2769 {
2770 #if defined(HAVE_KRB5_REALM_TYPE)
2771         /* Heimdal. */
2772         krb5_realm *realm_list = NULL;
2773 #else
2774         /* MIT */
2775         char **realm_list = NULL;
2776 #endif
2777         char *realm = NULL;
2778         krb5_error_code kerr;
2779         krb5_context ctx = NULL;
2780
2781         initialize_krb5_error_table();
2782         if (krb5_init_context(&ctx)) {
2783                 return NULL;
2784         }
2785
2786         kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
2787         if (kerr != 0) {
2788                 DEBUG(3,("kerberos_get_realm_from_hostname %s: "
2789                         "failed %s\n",
2790                         hostname ? hostname : "(NULL)",
2791                         error_message(kerr) ));
2792                 goto out;
2793         }
2794
2795         if (realm_list && realm_list[0]) {
2796                 realm = talloc_strdup(mem_ctx, realm_list[0]);
2797         }
2798
2799   out:
2800
2801         if (ctx) {
2802                 if (realm_list) {
2803                         krb5_free_host_realm(ctx, realm_list);
2804                         realm_list = NULL;
2805                 }
2806                 krb5_free_context(ctx);
2807                 ctx = NULL;
2808         }
2809         return realm;
2810 }
2811
2812 char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
2813                                                    const char *service,
2814                                                    const char *remote_name,
2815                                                    const char *default_realm)
2816 {
2817         char *realm = NULL;
2818         char *host = NULL;
2819         char *principal;
2820         host = strchr_m(remote_name, '.');
2821         if (host) {
2822                 /* DNS name. */
2823                 realm = smb_krb5_get_realm_from_hostname(talloc_tos(),
2824                                                          remote_name);
2825         } else {
2826                 /* NetBIOS name - use our realm. */
2827                 realm = smb_krb5_get_default_realm_from_ccache(talloc_tos());
2828         }
2829
2830         if (realm == NULL || *realm == '\0') {
2831                 realm = talloc_strdup(talloc_tos(), default_realm);
2832                 if (!realm) {
2833                         return NULL;
2834                 }
2835                 DEBUG(3,("kerberos_get_principal_from_service_hostname: "
2836                          "cannot get realm from, "
2837                          "desthost %s or default ccache. Using default "
2838                          "smb.conf realm %s\n",
2839                          remote_name,
2840                          realm));
2841         }
2842
2843         principal = talloc_asprintf(mem_ctx,
2844                                     "%s/%s@%s",
2845                                     service, remote_name,
2846                                     realm);
2847         TALLOC_FREE(realm);
2848         return principal;
2849 }
2850
2851 char *smb_get_krb5_error_message(krb5_context context,
2852                                  krb5_error_code code,
2853                                  TALLOC_CTX *mem_ctx)
2854 {
2855         char *ret;
2856
2857 #if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
2858         const char *context_error = krb5_get_error_message(context, code);
2859         if (context_error) {
2860                 ret = talloc_asprintf(mem_ctx, "%s: %s",
2861                                         error_message(code), context_error);
2862                 krb5_free_error_message(context, context_error);
2863                 return ret;
2864         }
2865 #endif
2866         ret = talloc_strdup(mem_ctx, error_message(code));
2867         return ret;
2868 }
2869
2870
2871 /**
2872 * @brief Return the kerberos library setting for "libdefaults:allow_weak_crypto"
2873 *
2874 * @param context        The krb5_context
2875 *
2876 * @return krb5_boolean
2877 *
2878 * Function returns true if weak crypto is allowd, false if not
2879 */
2880
2881 krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
2882 #if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
2883 {
2884         return krb5_config_get_bool_default(context,
2885                                             NULL,
2886                                             FALSE,
2887                                             "libdefaults",
2888                                             "allow_weak_crypto",
2889                                             NULL);
2890 }
2891 #elif defined(HAVE_PROFILE_H) && defined(HAVE_KRB5_GET_PROFILE)
2892 {
2893 #include <profile.h>
2894         krb5_error_code ret;
2895         krb5_boolean ret_default = false;
2896         profile_t profile;
2897         int ret_profile;
2898
2899         ret = krb5_get_profile(context,
2900                                &profile);
2901         if (ret) {
2902                 return ret_default;
2903         }
2904
2905         ret = profile_get_boolean(profile,
2906                                   "libdefaults",
2907                                   "allow_weak_crypto",
2908                                   NULL, /* subsubname */
2909                                   ret_default, /* def_val */
2910                                   &ret_profile /* *ret_default */);
2911         if (ret) {
2912                 return ret_default;
2913         }
2914
2915         profile_release(profile);
2916
2917         return ret_profile;
2918 }
2919 #else
2920 #error UNKNOWN_KRB5_CONFIG_ROUTINES
2921 #endif
2922
2923 /**
2924 * @brief Return the type of a krb5_principal
2925 *
2926 * @param context        The krb5_context
2927 * @param principal      The const krb5_principal
2928 *
2929 * @return integer type of the principal
2930 */
2931 int smb_krb5_principal_get_type(krb5_context context,
2932                                 krb5_const_principal principal)
2933 {
2934 #ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
2935         return krb5_principal_get_type(context, principal);
2936 #elif defined(krb5_princ_type) /* MIT */
2937         return krb5_princ_type(context, principal);
2938 #else
2939 #error  UNKNOWN_PRINC_GET_TYPE_FUNCTION
2940 #endif
2941 }
2942
2943 /**
2944 * @brief Set the type of a krb5_principal
2945 *
2946 * @param context        The krb5_context
2947 * @param principal      The const krb5_principal
2948 * @param type           The principal type
2949 *
2950 */
2951 void smb_krb5_principal_set_type(krb5_context context,
2952                                  krb5_principal principal,
2953                                  int type)
2954 {
2955 #ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
2956         krb5_principal_set_type(context, principal, type);
2957 #elif defined(krb5_princ_type) /* MIT */
2958         krb5_princ_type(context, principal) = type;
2959 #else
2960 #error  UNKNOWN_PRINC_SET_TYPE_FUNCTION
2961 #endif
2962 }
2963
2964 /**
2965 * @brief Generate a krb5 warning, forwarding to com_err
2966 *
2967 * @param context        The krb5_context
2968 * @param fmt            The message format
2969 * @param ...            The message arguments
2970 *
2971 * @return
2972 */
2973 #if !defined(HAVE_KRB5_WARNX)
2974 krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
2975 {
2976         va_list args;
2977
2978         va_start(args, fmt);
2979         com_err_va("kdb_samba", errno, fmt, args);
2980         va_end(args);
2981
2982         return 0;
2983 }
2984 #endif
2985
2986 #else /* HAVE_KRB5 */
2987  /* this saves a few linking headaches */
2988  int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2989                         const char *principal, time_t time_offset,
2990                         DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2991                         uint32_t extra_ap_opts,
2992                         const char *ccname, time_t *tgs_expire,
2993                         const char *impersonate_princ_s)
2994 {
2995          DEBUG(0,("NO KERBEROS SUPPORT\n"));
2996          return 1;
2997 }
2998
2999 #endif /* HAVE_KRB5 */