source4/libcli/auth/gensec_krb5.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Kerberos backend for GENSEC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
   7    Copyright (C) Andrew Tridgell 2001
   8    Copyright (C) Luke Howard 2002-2003
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include "includes.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_AUTH
  30
  31 enum GENSEC_KRB5_STATE {
  32         GENSEC_KRB5_SERVER_START,
  33         GENSEC_KRB5_CLIENT_START,
  34         GENSEC_KRB5_CLIENT_MUTUAL_AUTH,
  35         GENSEC_KRB5_DONE
  36 };
  37
  38 struct gensec_krb5_state {
  39         TALLOC_CTX *mem_ctx;
  40         DATA_BLOB session_key;
  41         struct PAC_LOGON_INFO *logon_info;
  42         enum GENSEC_KRB5_STATE state_position;
  43         krb5_context krb5_context;
  44         krb5_auth_context krb5_auth_context;
  45         krb5_ccache krb5_ccache;
  46         krb5_data ticket;
  47         krb5_keyblock krb5_keyblock;
  48         char *peer_principal;
  49 };
  50
  51 #ifdef KRB5_DO_VERIFY_PAC
  52 static NTSTATUS gensec_krb5_pac_checksum(DATA_BLOB pac_data,
  53                                             struct PAC_SIGNATURE_DATA *sig,
  54                                             struct gensec_krb5_state *gensec_krb5_state,
  55                                             uint32 keyusage)
  56 {
  57         krb5_error_code ret;
  58         krb5_crypto crypto;
  59         Checksum cksum;
  60         int i;
  61
  62         cksum.cksumtype         = (CKSUMTYPE)sig->type;
  63         cksum.checksum.length   = sizeof(sig->signature);
  64         cksum.checksum.data     = sig->signature;
  65
  66
  67         ret = krb5_crypto_init(gensec_krb5_state->krb5_context,
  68                                 &gensec_krb5_state->krb5_keyblock,
  69                                 0,
  70                                 &crypto);
  71         if (ret) {
  72                 DEBUG(0,("krb5_crypto_init() failed\n"));
  73                 return NT_STATUS_FOOBAR;
  74         }
  75         for (i=0; i < 40; i++) {
  76                 keyusage = i;
  77                 ret = krb5_verify_checksum(gensec_krb5_state->krb5_context,
  78                                            crypto,
  79                                            keyusage,
  80                                            pac_data.data,
  81                                            pac_data.length,
  82                                            &cksum);
  83                 if (!ret) {
  84                         DEBUG(0,("PAC Verified: keyusage: %d\n", keyusage));
  85                         break;
  86                 }
  87         }
  88         krb5_crypto_destroy(gensec_krb5_state->krb5_context, crypto);
  89
  90         if (ret) {
  91                 DEBUG(0,("NOT verifying PAC checksums yet!\n"));
  92                 //return NT_STATUS_LOGON_FAILURE;
  93         } else {
  94                 DEBUG(0,("PAC checksums verified!\n"));
  95         }
  96
  97         return NT_STATUS_OK;
  98 }
  99 #endif
 100
 101 static NTSTATUS gensec_krb5_decode_pac(TALLOC_CTX *mem_ctx,
 102                                 struct PAC_LOGON_INFO **logon_info_out,
 103                                 DATA_BLOB blob,
 104                                 struct gensec_krb5_state *gensec_krb5_state)
 105 {
 106         NTSTATUS status;
 107         struct PAC_SIGNATURE_DATA srv_sig;
 108         struct PAC_SIGNATURE_DATA *srv_sig_ptr;
 109         struct PAC_SIGNATURE_DATA kdc_sig;
 110         struct PAC_SIGNATURE_DATA *kdc_sig_ptr;
 111         struct PAC_LOGON_INFO *logon_info = NULL;
 112         struct PAC_DATA pac_data;
 113 #ifdef KRB5_DO_VERIFY_PAC
 114         DATA_BLOB tmp_blob = data_blob(NULL, 0);
 115 #endif
 116         int i;
 117
 118         status = ndr_pull_struct_blob(&blob, mem_ctx, &pac_data,
 119                                         (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
 120         if (!NT_STATUS_IS_OK(status)) {
 121                 DEBUG(0,("can't parse the PAC\n"));
 122                 return status;
 123         }
 124         NDR_PRINT_DEBUG(PAC_DATA, &pac_data);
 125
 126         if (pac_data.num_buffers < 3) {
 127                 /* we need logon_ingo, service_key and kdc_key */
 128                 DEBUG(0,("less than 3 PAC buffers\n"));
 129                 return NT_STATUS_FOOBAR;
 130         }
 131
 132         for (i=0; i < pac_data.num_buffers; i++) {
 133                 switch (pac_data.buffers[i].type) {
 134                         case PAC_TYPE_LOGON_INFO:
 135                                 if (!pac_data.buffers[i].info) {
 136                                         break;
 137                                 }
 138                                 logon_info = &pac_data.buffers[i].info->logon_info;
 139                                 break;
 140                         case PAC_TYPE_SRV_CHECKSUM:
 141                                 if (!pac_data.buffers[i].info) {
 142                                         break;
 143                                 }
 144                                 srv_sig_ptr = &pac_data.buffers[i].info->srv_cksum;
 145                                 srv_sig = pac_data.buffers[i].info->srv_cksum;
 146                                 break;
 147                         case PAC_TYPE_KDC_CHECKSUM:
 148                                 if (!pac_data.buffers[i].info) {
 149                                         break;
 150                                 }
 151                                 kdc_sig_ptr = &pac_data.buffers[i].info->kdc_cksum;
 152                                 kdc_sig = pac_data.buffers[i].info->kdc_cksum;
 153                                 break;
 154                         case PAC_TYPE_UNKNOWN_10:
 155                                 break;
 156                         default:
 157                                 break;
 158                 }
 159         }
 160
 161         if (!logon_info) {
 162                 DEBUG(0,("PAC no logon_info\n"));
 163                 return NT_STATUS_FOOBAR;
 164         }
 165
 166         if (!srv_sig_ptr) {
 167                 DEBUG(0,("PAC no srv_key\n"));
 168                 return NT_STATUS_FOOBAR;
 169         }
 170
 171         if (!kdc_sig_ptr) {
 172                 DEBUG(0,("PAC no kdc_key\n"));
 173                 return NT_STATUS_FOOBAR;
 174         }
 175 #ifdef KRB5_DO_VERIFY_PAC
 176         /* clear the kdc_key */
 177 /*      memset((void *)kdc_sig_ptr , '\0', sizeof(*kdc_sig_ptr));*/
 178
 179         status = ndr_push_struct_blob(&tmp_blob, mem_ctx, &pac_data,
 180                                               (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
 181         if (!NT_STATUS_IS_OK(status)) {
 182                 return status;
 183         }
 184         status = ndr_pull_struct_blob(&tmp_blob, mem_ctx, &pac_data,
 185                                         (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
 186         if (!NT_STATUS_IS_OK(status)) {
 187                 DEBUG(0,("can't parse the PAC\n"));
 188                 return status;
 189         }
 190         /*NDR_PRINT_DEBUG(PAC_DATA, &pac_data);*/
 191
 192         /* verify by kdc_key */
 193         status = gensec_krb5_pac_checksum(tmp_blob, &kdc_sig, gensec_krb5_state, 0);
 194
 195         if (!NT_STATUS_IS_OK(status)) {
 196                 return status;
 197         }
 198
 199         /* clear the service_key */
 200 /*      memset((void *)srv_sig_ptr , '\0', sizeof(*srv_sig_ptr));*/
 201
 202         status = ndr_push_struct_blob(&tmp_blob, mem_ctx, &pac_data,
 203                                               (ndr_push_flags_fn_t)ndr_push_PAC_DATA);
 204         if (!NT_STATUS_IS_OK(status)) {
 205                 return status;
 206         }
 207         status = ndr_pull_struct_blob(&tmp_blob, mem_ctx, &pac_data,
 208                                         (ndr_pull_flags_fn_t)ndr_pull_PAC_DATA);
 209         if (!NT_STATUS_IS_OK(status)) {
 210                 DEBUG(0,("can't parse the PAC\n"));
 211                 return status;
 212         }
 213         NDR_PRINT_DEBUG(PAC_DATA, &pac_data);
 214
 215         /* verify by servie_key */
 216         status = gensec_krb5_pac_checksum(tmp_blob, &srv_sig, gensec_krb5_state, 0);
 217
 218         if (!NT_STATUS_IS_OK(status)) {
 219                 return status;
 220         }
 221 #endif
 222         DEBUG(0,("account_name: %s [%s]\n",logon_info->account_name.string, logon_info->full_name.string));
 223         *logon_info_out = logon_info;
 224
 225         return status;
 226 }
 227
 228 static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security)
 229 {
 230         struct gensec_krb5_state *gensec_krb5_state;
 231         krb5_error_code ret = 0;
 232
 233         TALLOC_CTX *mem_ctx = talloc_init("gensec_krb5");
 234         if (!mem_ctx) {
 235                 return NT_STATUS_NO_MEMORY;
 236         }
 237
 238         gensec_krb5_state = talloc_p(mem_ctx, struct gensec_krb5_state);
 239         if (!gensec_krb5_state) {
 240                 return NT_STATUS_NO_MEMORY;
 241         }
 242
 243         gensec_krb5_state->mem_ctx = mem_ctx;
 244
 245         gensec_security->private_data = gensec_krb5_state;
 246
 247         initialize_krb5_error_table();
 248         gensec_krb5_state->krb5_context = NULL;
 249         gensec_krb5_state->krb5_auth_context = NULL;
 250         gensec_krb5_state->krb5_ccache = NULL;
 251         ZERO_STRUCT(gensec_krb5_state->ticket);
 252         gensec_krb5_state->session_key = data_blob(NULL, 0);
 253
 254         ret = krb5_init_context(&gensec_krb5_state->krb5_context);
 255         if (ret) {
 256                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n", error_message(ret)));
 257                 return NT_STATUS_INTERNAL_ERROR;
 258         }
 259
 260         if (lp_realm() && *lp_realm()) {
 261                 ret = krb5_set_default_realm(gensec_krb5_state->krb5_context, lp_realm());
 262                 if (ret) {
 263                         DEBUG(1,("gensec_krb5_start: krb5_set_default_realm failed (%s)\n", error_message(ret)));
 264                         return NT_STATUS_INTERNAL_ERROR;
 265                 }
 266         }
 267
 268         ret = krb5_auth_con_init(gensec_krb5_state->krb5_context, &gensec_krb5_state->krb5_auth_context);
 269         if (ret) {
 270                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n", error_message(ret)));
 271                 return NT_STATUS_INTERNAL_ERROR;
 272         }
 273
 274         return NT_STATUS_OK;
 275 }
 276
 277 static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
 278 {
 279         NTSTATUS nt_status;
 280         struct gensec_krb5_state *gensec_krb5_state;
 281
 282         nt_status = gensec_krb5_start(gensec_security);
 283         if (!NT_STATUS_IS_OK(nt_status)) {
 284                 return nt_status;
 285         }
 286
 287         gensec_krb5_state = gensec_security->private_data;
 288         gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
 289
 290         return NT_STATUS_OK;
 291 }
 292
 293 static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security)
 294 {
 295         struct gensec_krb5_state *gensec_krb5_state;
 296         krb5_error_code ret;
 297         NTSTATUS nt_status;
 298
 299         nt_status = gensec_krb5_start(gensec_security);
 300         if (!NT_STATUS_IS_OK(nt_status)) {
 301                 return nt_status;
 302         }
 303
 304         gensec_krb5_state = gensec_security->private_data;
 305         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
 306
 307         /* TODO: This is effecivly a static/global variable... */
 308         ret = krb5_cc_default(gensec_krb5_state->krb5_context, &gensec_krb5_state->krb5_ccache);
 309         if (ret) {
 310                 DEBUG(1,("krb5_cc_default failed (%s)\n",
 311                          error_message(ret)));
 312                 return NT_STATUS_INTERNAL_ERROR;
 313         }
 314
 315         while (1) {
 316                 if (gensec_security->target.principal) {
 317                         DEBUG(5, ("Finding ticket for target [%s]\n", gensec_security->target.principal));
 318                         ret = ads_krb5_mk_req(gensec_krb5_state->krb5_context,
 319                                               &gensec_krb5_state->krb5_auth_context,
 320                                               AP_OPTS_USE_SUBKEY | AP_OPTS_MUTUAL_REQUIRED,
 321                                               gensec_security->target.principal,
 322                                               gensec_krb5_state->krb5_ccache,
 323                                               &gensec_krb5_state->ticket);
 324                         if (ret) {
 325                                 DEBUG(1,("ads_krb5_mk_req failed (%s)\n",
 326                                          error_message(ret)));
 327                         }
 328                 } else {
 329                         krb5_data in_data;
 330                         const char *hostname = gensec_get_target_hostname(gensec_security);
 331                         if (!hostname) {
 332                                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 333                                 return NT_STATUS_ACCESS_DENIED;
 334                         }
 335                         ret = krb5_mk_req(gensec_krb5_state->krb5_context,
 336                                           &gensec_krb5_state->krb5_auth_context,
 337                                           AP_OPTS_USE_SUBKEY | AP_OPTS_MUTUAL_REQUIRED,
 338                                           gensec_get_target_service(gensec_security),
 339                                           hostname,
 340                                           &in_data, gensec_krb5_state->krb5_ccache,
 341                                           &gensec_krb5_state->ticket);
 342                         if (ret) {
 343                                 DEBUG(1,("krb5_mk_req failed (%s)\n",
 344                                          error_message(ret)));
 345                         }
 346
 347                 }
 348                 switch (ret) {
 349                 case 0:
 350                         return NT_STATUS_OK;
 351                 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 352                         DEBUG(3, ("Server is not registered with our KDC: %s\n",
 353                                   error_message(ret)));
 354                         return NT_STATUS_ACCESS_DENIED;
 355                 case KRB5KDC_ERR_PREAUTH_FAILED:
 356                 case KRB5KRB_AP_ERR_TKT_EXPIRED:
 357                 case KRB5_CC_END:
 358                 {
 359                         DEBUG(3, ("kerberos: %s\n",
 360                                   error_message(ret)));
 361                         /* fall down to remaining code */
 362                 }
 363                 /* just don't print a message for these really ordinary messages */
 364                 case KRB5_FCC_NOFILE:
 365                 case KRB5_CC_NOTFOUND:
 366                 {
 367                         char *password;
 368                         time_t kdc_time = 0;
 369                         nt_status = gensec_get_password(gensec_security,
 370                                                         gensec_security->mem_ctx,
 371                                                         &password);
 372                         if (!NT_STATUS_IS_OK(nt_status)) {
 373                                 return nt_status;
 374                         }
 375
 376                         ret = kerberos_kinit_password_cc(gensec_krb5_state->krb5_context, gensec_krb5_state->krb5_ccache,
 377                                                          gensec_get_client_principal(gensec_security, gensec_security->mem_ctx),
 378                                                          password, NULL, &kdc_time);
 379
 380                         /* cope with ticket being in the future due to clock skew */
 381                         if ((unsigned)kdc_time > time(NULL)) {
 382                                 time_t t = time(NULL);
 383                                 int time_offset =(unsigned)kdc_time-t;
 384                                 DEBUG(4,("Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 385                                 krb5_set_real_time(gensec_krb5_state->krb5_context, t + time_offset + 1, 0);
 386                         }
 387
 388                         if (ret) {
 389                                 DEBUG(1,("kinit failed (%s)\n",
 390                                          error_message(ret)));
 391                                 return NT_STATUS_WRONG_PASSWORD;
 392                         }
 393                         break;
 394                 }
 395                 default:
 396                         DEBUG(0, ("kerberos: %s\n",
 397                                   error_message(ret)));
 398                         return NT_STATUS_UNSUCCESSFUL;
 399                 }
 400         }
 401 }
 402
 403 static void gensec_krb5_end(struct gensec_security *gensec_security)
 404 {
 405         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 406
 407         if (gensec_krb5_state->ticket.length) {
 408         /* Hmm, heimdal dooesn't have this - what's the correct call? */
 409 #ifdef HAVE_KRB5_FREE_DATA_CONTENTS
 410                 krb5_free_data_contents(gensec_krb5_state->krb5_context, &gensec_krb5_state->ticket);
 411 #endif
 412         }
 413         if (gensec_krb5_state->krb5_ccache) {
 414                 /* Removed by jra. They really need to fix their kerberos so we don't leak memory.
 415                    JERRY -- disabled since it causes heimdal 0.6.1rc3 to die
 416                    SuSE 9.1 Pro
 417                 */
 418 #if 0 /* redisabled by gd :) at least until any official heimdal version has it fixed. */
 419                 krb5_cc_close(context, gensec_krb5_state->krb5_ccache);
 420 #endif
 421         }
 422
 423         if (gensec_krb5_state->krb5_auth_context) {
 424                 krb5_auth_con_free(gensec_krb5_state->krb5_context,
 425                                    gensec_krb5_state->krb5_auth_context);
 426         }
 427
 428         if (gensec_krb5_state->krb5_context) {
 429                 krb5_free_context(gensec_krb5_state->krb5_context);
 430         }
 431
 432         talloc_destroy(gensec_krb5_state->mem_ctx);
 433         gensec_security->private_data = NULL;
 434 }
 435
 436
 437 /**
 438  * Next state function for the Krb5 GENSEC mechanism
 439  *
 440  * @param gensec_krb5_state KRB5 State
 441  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 442  * @param in The request, as a DATA_BLOB
 443  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 444  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 445  *                or NT_STATUS_OK if the user is authenticated.
 446  */
 447
 448 static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
 449                                       const DATA_BLOB in, DATA_BLOB *out)
 450 {
 451         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 452         krb5_error_code ret = 0;
 453         DATA_BLOB pac;
 454         NTSTATUS nt_status;
 455
 456         switch (gensec_krb5_state->state_position) {
 457         case GENSEC_KRB5_CLIENT_START:
 458         {
 459                 if (ret) {
 460                         DEBUG(1,("ads_krb5_mk_req (request ticket) failed (%s)\n",
 461                                  error_message(ret)));
 462                         nt_status = NT_STATUS_LOGON_FAILURE;
 463                 } else {
 464                         DATA_BLOB unwrapped_out;
 465
 466 #ifndef GENSEC_SEND_UNWRAPPED_KRB5 /* This should be a switch for the torture code to set */
 467                         unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->ticket.data, gensec_krb5_state->ticket.length);
 468
 469                         /* wrap that up in a nice GSS-API wrapping */
 470                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
 471 #else
 472                         *out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->ticket.data, gensec_krb5_state->ticket.length);
 473 #endif
 474                         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
 475                         nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 476                 }
 477
 478                 return nt_status;
 479         }
 480
 481         case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
 482         {
 483                 krb5_data inbuf;
 484                 krb5_ap_rep_enc_part *repl = NULL;
 485                 uint8 tok_id[2];
 486                 DATA_BLOB unwrapped_in;
 487
 488                 if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 489                         DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
 490                         dump_data_pw("Mutual authentication message:\n", in.data, in.length);
 491                         return NT_STATUS_INVALID_PARAMETER;
 492                 }
 493                 /* TODO: check the tok_id */
 494
 495                 inbuf.data = unwrapped_in.data;
 496                 inbuf.length = unwrapped_in.length;
 497                 ret = krb5_rd_rep(gensec_krb5_state->krb5_context,
 498                                   gensec_krb5_state->krb5_auth_context,
 499                                   &inbuf, &repl);
 500                 if (ret) {
 501                         DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
 502                                  error_message(ret)));
 503                         dump_data_pw("Mutual authentication message:\n", inbuf.data, inbuf.length);
 504                         nt_status = NT_STATUS_ACCESS_DENIED;
 505                 } else {
 506                         *out = data_blob(NULL, 0);
 507                         nt_status = NT_STATUS_OK;
 508                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 509                 }
 510                 if (repl) {
 511                         krb5_free_ap_rep_enc_part(gensec_krb5_state->krb5_context, repl);
 512                 }
 513                 return nt_status;
 514         }
 515
 516         case GENSEC_KRB5_SERVER_START:
 517         {
 518                 char *principal;
 519                 DATA_BLOB unwrapped_in;
 520                 DATA_BLOB unwrapped_out;
 521                 uint8 tok_id[2];
 522
 523                 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
 524                 if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 525                         nt_status = ads_verify_ticket(out_mem_ctx,
 526                                                       gensec_krb5_state->krb5_context,
 527                                                       gensec_krb5_state->krb5_auth_context,
 528                                                       lp_realm(), &in,
 529                                                       &principal, &pac, &unwrapped_out,
 530                                                       &gensec_krb5_state->krb5_keyblock);
 531                 } else {
 532                         /* TODO: check the tok_id */
 533                         nt_status = ads_verify_ticket(out_mem_ctx,
 534                                                       gensec_krb5_state->krb5_context,
 535                                                       gensec_krb5_state->krb5_auth_context,
 536                                                       lp_realm(), &unwrapped_in,
 537                                                       &principal, &pac, &unwrapped_out,
 538                                                       &gensec_krb5_state->krb5_keyblock);
 539                 }
 540
 541                 if (!NT_STATUS_IS_OK(nt_status)) {
 542                         return nt_status;
 543                 }
 544
 545                 if (pac.data) {
 546                         /* decode and verify the pac */
 547                         nt_status = gensec_krb5_decode_pac(gensec_krb5_state->mem_ctx, &gensec_krb5_state->logon_info, pac,
 548                                                            gensec_krb5_state);
 549                 } else {
 550                         /* NULL PAC, we might need to figure this information out the hard way */
 551                         gensec_krb5_state->logon_info = NULL;
 552                 }
 553
 554                 if (NT_STATUS_IS_OK(nt_status)) {
 555                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 556                         /* wrap that up in a nice GSS-API wrapping */
 557                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
 558
 559                         gensec_krb5_state->peer_principal = talloc_steal(gensec_krb5_state->mem_ctx, principal);
 560                 }
 561                 return nt_status;
 562         }
 563         case GENSEC_KRB5_DONE:
 564                 return NT_STATUS_OK;
 565         }
 566
 567         return NT_STATUS_INVALID_PARAMETER;
 568 }
 569
 570 static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
 571                                            DATA_BLOB *session_key)
 572 {
 573         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 574         krb5_context context = gensec_krb5_state->krb5_context;
 575         krb5_auth_context auth_context = gensec_krb5_state->krb5_auth_context;
 576         krb5_keyblock *skey;
 577         krb5_error_code err;
 578
 579         if (gensec_krb5_state->session_key.data) {
 580                 *session_key = gensec_krb5_state->session_key;
 581                 return NT_STATUS_OK;
 582         }
 583
 584         switch (gensec_security->gensec_role) {
 585         case GENSEC_CLIENT:
 586                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 587                 break;
 588         case GENSEC_SERVER:
 589                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 590                 break;
 591         }
 592         if (err == 0 && skey != NULL) {
 593                 DEBUG(10, ("Got KRB5 session key of length %d\n",  KRB5_KEY_LENGTH(skey)));
 594                 gensec_krb5_state->session_key = data_blob_talloc(gensec_krb5_state->mem_ctx,
 595                                                 KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 596                 *session_key = gensec_krb5_state->session_key;
 597                 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 598
 599                 krb5_free_keyblock(context, skey);
 600                 return NT_STATUS_OK;
 601         } else {
 602                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 603                 return NT_STATUS_NO_USER_SESSION_KEY;
 604         }
 605 }
 606
 607 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
 608                                      struct auth_session_info **session_info_out)
 609 {
 610         NTSTATUS nt_status;
 611         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 612         TALLOC_CTX *mem_ctx;
 613         struct auth_serversupplied_info *server_info = NULL;
 614         struct auth_session_info *session_info = NULL;
 615         struct PAC_LOGON_INFO *logon_info = gensec_krb5_state->logon_info;
 616         struct nt_user_token *ptoken;
 617         struct dom_sid *sid;
 618         char *p;
 619         char *principal;
 620
 621         *session_info_out = NULL;
 622
 623         nt_status = make_server_info(&server_info, gensec_krb5_state->peer_principal);
 624         if (!NT_STATUS_IS_OK(nt_status)) {
 625                 return nt_status;
 626         }
 627
 628         server_info->guest = False;
 629
 630         principal = talloc_strdup(server_info->mem_ctx, gensec_krb5_state->peer_principal);
 631         p = strchr(principal, '@');
 632         if (p) {
 633                 *p = '\0';
 634         }
 635         server_info->account_name = principal;
 636         server_info->domain = talloc_strdup(server_info->mem_ctx, p++);
 637         if (!server_info->domain) {
 638                 free_server_info(&server_info);
 639                 return NT_STATUS_NO_MEMORY;
 640         }
 641
 642         nt_status = make_session_info(server_info, &session_info);
 643         if (!NT_STATUS_IS_OK(nt_status)) {
 644                 free_server_info(&server_info);
 645                 return nt_status;
 646         }
 647
 648         /* IF we have the PAC - otherwise (TODO) we need to get this
 649          * data from elsewere - local ldb, or lookup of some
 650          * kind... */
 651
 652         if (logon_info) {
 653                 ptoken = talloc_p(session_info->mem_ctx, struct nt_user_token);
 654                 if (!ptoken) {
 655                         return NT_STATUS_NO_MEMORY;
 656                 }
 657
 658                 ptoken->num_sids = 0;
 659
 660                 ptoken->user_sids = talloc_array_p(mem_ctx, struct dom_sid*, logon_info->groups_count + 2);
 661                 if (!ptoken->user_sids) {
 662                         return NT_STATUS_NO_MEMORY;
 663                 }
 664
 665
 666                 sid = dom_sid_dup(session_info->mem_ctx, logon_info->dom_sid);
 667                 ptoken->user_sids[0] = dom_sid_add_rid(session_info->mem_ctx, sid, logon_info->user_rid);
 668                 ptoken->num_sids++;
 669                 sid = dom_sid_dup(session_info->mem_ctx, logon_info->dom_sid);
 670                 ptoken->user_sids[1] = dom_sid_add_rid(session_info->mem_ctx, sid, logon_info->group_rid);
 671                 ptoken->num_sids++;
 672
 673                 for (;ptoken->num_sids < logon_info->groups_count; ptoken->num_sids++) {
 674                         sid = dom_sid_dup(session_info->mem_ctx, logon_info->dom_sid);
 675                         ptoken->user_sids[ptoken->num_sids] = dom_sid_add_rid(session_info->mem_ctx, sid, logon_info->groups[ptoken->num_sids - 2].rid);
 676                 }
 677
 678                 debug_nt_user_token(DBGC_AUTH, 0, ptoken);
 679
 680                 session_info->nt_user_token = ptoken;
 681         } else {
 682                 session_info->nt_user_token = NULL;
 683         }
 684
 685         nt_status = gensec_krb5_session_key(gensec_security, &session_info->session_key);
 686
 687         session_info->workstation = NULL;
 688
 689         *session_info_out = session_info;
 690
 691         return nt_status;
 692 }
 693
 694
 695 static const struct gensec_security_ops gensec_krb5_security_ops = {
 696         .name           = "krb5",
 697         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
 698         .oid            = OID_KERBEROS5,
 699         .client_start   = gensec_krb5_client_start,
 700         .server_start   = gensec_krb5_server_start,
 701         .update         = gensec_krb5_update,
 702         .session_key    = gensec_krb5_session_key,
 703         .session_info   = gensec_krb5_session_info,
 704         .end            = gensec_krb5_end
 705 };
 706
 707 static const struct gensec_security_ops gensec_ms_krb5_security_ops = {
 708         .name           = "ms_krb5",
 709         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
 710         .oid            = OID_KERBEROS5_OLD,
 711         .client_start   = gensec_krb5_client_start,
 712         .server_start   = gensec_krb5_server_start,
 713         .update         = gensec_krb5_update,
 714         .session_key    = gensec_krb5_session_key,
 715         .session_info   = gensec_krb5_session_info,
 716         .end            = gensec_krb5_end
 717 };
 718
 719
 720 NTSTATUS gensec_krb5_init(void)
 721 {
 722         NTSTATUS ret;
 723
 724         ret = register_backend("gensec", &gensec_krb5_security_ops);
 725         if (!NT_STATUS_IS_OK(ret)) {
 726                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 727                         gensec_krb5_security_ops.name));
 728                 return ret;
 729         }
 730
 731         ret = register_backend("gensec", &gensec_ms_krb5_security_ops);
 732         if (!NT_STATUS_IS_OK(ret)) {
 733                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 734                         gensec_krb5_security_ops.name));
 735                 return ret;
 736         }
 737
 738         return ret;
 739 }