source4/auth/gensec/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    Copyright (C) Stefan Metzmacher 2004-2005
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25 */
  26
  27 #include "includes.h"
  28 #include "system/kerberos.h"
  29 #include "system/time.h"
  30 #include "system/network.h"
  31 #include "auth/kerberos/kerberos.h"
  32 #include "librpc/gen_ndr/ndr_krb5pac.h"
  33 #include "auth/auth.h"
  34
  35 enum GENSEC_KRB5_STATE {
  36         GENSEC_KRB5_SERVER_START,
  37         GENSEC_KRB5_CLIENT_START,
  38         GENSEC_KRB5_CLIENT_MUTUAL_AUTH,
  39         GENSEC_KRB5_DONE
  40 };
  41
  42 struct gensec_krb5_state {
  43         DATA_BLOB session_key;
  44         DATA_BLOB pac;
  45         enum GENSEC_KRB5_STATE state_position;
  46         struct smb_krb5_context *smb_krb5_context;
  47         krb5_auth_context auth_context;
  48         krb5_data enc_ticket;
  49         krb5_keyblock *keyblock;
  50         krb5_ticket *ticket;
  51         BOOL gssapi;
  52 };
  53
  54 static int gensec_krb5_destroy(void *ptr)
  55 {
  56         struct gensec_krb5_state *gensec_krb5_state = ptr;
  57
  58         if (!gensec_krb5_state->smb_krb5_context) {
  59                 /* We can't clean anything else up unless we started up this far */
  60                 return 0;
  61         }
  62         if (gensec_krb5_state->enc_ticket.length) {
  63                 kerberos_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
  64                                             &gensec_krb5_state->enc_ticket);
  65         }
  66
  67         if (gensec_krb5_state->ticket) {
  68                 krb5_free_ticket(gensec_krb5_state->smb_krb5_context->krb5_context,
  69                                  gensec_krb5_state->ticket);
  70         }
  71
  72         /* ccache freed in a child destructor */
  73
  74         krb5_free_keyblock(gensec_krb5_state->smb_krb5_context->krb5_context,
  75                            gensec_krb5_state->keyblock);
  76
  77         if (gensec_krb5_state->auth_context) {
  78                 krb5_auth_con_free(gensec_krb5_state->smb_krb5_context->krb5_context,
  79                                    gensec_krb5_state->auth_context);
  80         }
  81
  82         return 0;
  83 }
  84
  85 static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security)
  86 {
  87         krb5_error_code ret;
  88         struct gensec_krb5_state *gensec_krb5_state;
  89         struct cli_credentials *creds;
  90
  91         creds = gensec_get_credentials(gensec_security);
  92         if (!creds) {
  93                 return NT_STATUS_INVALID_PARAMETER;
  94         }
  95
  96         gensec_krb5_state = talloc(gensec_security, struct gensec_krb5_state);
  97         if (!gensec_krb5_state) {
  98                 return NT_STATUS_NO_MEMORY;
  99         }
 100
 101         gensec_security->private_data = gensec_krb5_state;
 102         gensec_krb5_state->smb_krb5_context = NULL;
 103         gensec_krb5_state->auth_context = NULL;
 104         gensec_krb5_state->ticket = NULL;
 105         ZERO_STRUCT(gensec_krb5_state->enc_ticket);
 106         gensec_krb5_state->keyblock = NULL;
 107         gensec_krb5_state->session_key = data_blob(NULL, 0);
 108         gensec_krb5_state->pac = data_blob(NULL, 0);
 109         gensec_krb5_state->gssapi = False;
 110
 111         talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
 112
 113         if (cli_credentials_get_krb5_context(creds, &gensec_krb5_state->smb_krb5_context)) {
 114                 talloc_free(gensec_krb5_state);
 115                 return NT_STATUS_INTERNAL_ERROR;
 116         }
 117
 118         ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
 119         if (ret) {
 120                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
 121                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 122                                                     ret, gensec_krb5_state)));
 123                 talloc_free(gensec_krb5_state);
 124                 return NT_STATUS_INTERNAL_ERROR;
 125         }
 126
 127         ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
 128                                      gensec_krb5_state->auth_context,
 129                                      KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 130         if (ret) {
 131                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
 132                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 133                                                     ret, gensec_krb5_state)));
 134                 talloc_free(gensec_krb5_state);
 135                 return NT_STATUS_INTERNAL_ERROR;
 136         }
 137
 138         return NT_STATUS_OK;
 139 }
 140
 141 static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
 142 {
 143         NTSTATUS nt_status;
 144         struct gensec_krb5_state *gensec_krb5_state;
 145
 146         nt_status = gensec_krb5_start(gensec_security);
 147         if (!NT_STATUS_IS_OK(nt_status)) {
 148                 return nt_status;
 149         }
 150
 151         gensec_krb5_state = gensec_security->private_data;
 152         gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
 153
 154         return NT_STATUS_OK;
 155 }
 156
 157 static NTSTATUS gensec_fake_gssapi_krb5_server_start(struct gensec_security *gensec_security)
 158 {
 159         NTSTATUS nt_status = gensec_krb5_server_start(gensec_security);
 160
 161         if (NT_STATUS_IS_OK(nt_status)) {
 162                 struct gensec_krb5_state *gensec_krb5_state;
 163                 gensec_krb5_state = gensec_security->private_data;
 164                 gensec_krb5_state->gssapi = True;
 165         }
 166         return nt_status;
 167 }
 168
 169 static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security)
 170 {
 171         struct gensec_krb5_state *gensec_krb5_state;
 172         krb5_error_code ret;
 173         NTSTATUS nt_status;
 174         struct ccache_container *ccache_container;
 175         const char *hostname;
 176         krb5_flags ap_req_options = AP_OPTS_USE_SUBKEY | AP_OPTS_MUTUAL_REQUIRED;
 177
 178         const char *principal;
 179         krb5_data in_data;
 180
 181         hostname = gensec_get_target_hostname(gensec_security);
 182         if (!hostname) {
 183                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 184                 return NT_STATUS_INVALID_PARAMETER;
 185         }
 186         if (is_ipaddress(hostname)) {
 187                 DEBUG(2, ("Cannot do krb5 to an IP address"));
 188                 return NT_STATUS_INVALID_PARAMETER;
 189         }
 190         if (strequal(hostname, "localhost")) {
 191                 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
 192                 return NT_STATUS_INVALID_PARAMETER;
 193         }
 194
 195         nt_status = gensec_krb5_start(gensec_security);
 196         if (!NT_STATUS_IS_OK(nt_status)) {
 197                 return nt_status;
 198         }
 199
 200         gensec_krb5_state = gensec_security->private_data;
 201         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
 202
 203         ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security), &ccache_container);
 204         if (ret) {
 205                 DEBUG(1,("gensec_krb5_start: cli_credentials_get_ccache failed: %s\n",
 206                          error_message(ret)));
 207                 return NT_STATUS_UNSUCCESSFUL;
 208         }
 209
 210         in_data.length = 0;
 211
 212         principal = gensec_get_target_principal(gensec_security);
 213         if (principal && lp_client_use_spnego_principal()) {
 214                 krb5_principal target_principal;
 215                 ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
 216                                       &target_principal);
 217                 if (ret == 0) {
 218                         ret = krb5_mk_req_exact(gensec_krb5_state->smb_krb5_context->krb5_context,
 219                                                 &gensec_krb5_state->auth_context,
 220                                                 ap_req_options,
 221                                                 target_principal,
 222                                                 &in_data, ccache_container->ccache,
 223                                                 &gensec_krb5_state->enc_ticket);
 224                         krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 225                                             target_principal);
 226                 }
 227         } else {
 228                 ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
 229                                   &gensec_krb5_state->auth_context,
 230                                   ap_req_options,
 231                                   gensec_get_target_service(gensec_security),
 232                                   hostname,
 233                                   &in_data, ccache_container->ccache,
 234                                   &gensec_krb5_state->enc_ticket);
 235         }
 236         switch (ret) {
 237         case 0:
 238                 return NT_STATUS_OK;
 239         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 240                 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
 241                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 242                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 243         case KRB5_KDC_UNREACH:
 244                 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
 245                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 246                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 247         case KRB5KDC_ERR_PREAUTH_FAILED:
 248         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 249         case KRB5_CC_END:
 250                 /* Too much clock skew - we will need to kinit to re-skew the clock */
 251         case KRB5KRB_AP_ERR_SKEW:
 252         case KRB5_KDCREP_SKEW:
 253         {
 254                 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
 255                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 256                 /* fall down to remaining code */
 257         }
 258
 259
 260         /* just don't print a message for these really ordinary messages */
 261         case KRB5_FCC_NOFILE:
 262         case KRB5_CC_NOTFOUND:
 263         case ENOENT:
 264
 265                 return NT_STATUS_UNSUCCESSFUL;
 266                 break;
 267
 268         default:
 269                 DEBUG(0, ("kerberos: %s\n",
 270                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 271                 return NT_STATUS_UNSUCCESSFUL;
 272         }
 273 }
 274
 275 static NTSTATUS gensec_fake_gssapi_krb5_client_start(struct gensec_security *gensec_security)
 276 {
 277         NTSTATUS nt_status = gensec_krb5_client_start(gensec_security);
 278
 279         if (NT_STATUS_IS_OK(nt_status)) {
 280                 struct gensec_krb5_state *gensec_krb5_state;
 281                 gensec_krb5_state = gensec_security->private_data;
 282                 gensec_krb5_state->gssapi = True;
 283         }
 284         return nt_status;
 285 }
 286
 287 /**
 288  * Check if the packet is one for this mechansim
 289  *
 290  * @param gensec_security GENSEC state
 291  * @param in The request, as a DATA_BLOB
 292  * @return Error, INVALID_PARAMETER if it's not a packet for us
 293  *                or NT_STATUS_OK if the packet is ok.
 294  */
 295
 296 static NTSTATUS gensec_fake_gssapi_krb5_magic(struct gensec_security *gensec_security,
 297                                   const DATA_BLOB *in)
 298 {
 299         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 300                 return NT_STATUS_OK;
 301         } else {
 302                 return NT_STATUS_INVALID_PARAMETER;
 303         }
 304 }
 305
 306
 307 /**
 308  * Next state function for the Krb5 GENSEC mechanism
 309  *
 310  * @param gensec_krb5_state KRB5 State
 311  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 312  * @param in The request, as a DATA_BLOB
 313  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 314  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 315  *                or NT_STATUS_OK if the user is authenticated.
 316  */
 317
 318 static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
 319                                    TALLOC_CTX *out_mem_ctx,
 320                                    const DATA_BLOB in, DATA_BLOB *out)
 321 {
 322         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 323         krb5_error_code ret = 0;
 324         NTSTATUS nt_status;
 325
 326         switch (gensec_krb5_state->state_position) {
 327         case GENSEC_KRB5_CLIENT_START:
 328         {
 329                 DATA_BLOB unwrapped_out;
 330
 331                 if (gensec_krb5_state->gssapi) {
 332                         unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 333
 334                         /* wrap that up in a nice GSS-API wrapping */
 335                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
 336                 } else {
 337                         *out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 338                 }
 339                 gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
 340                 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 341                 return nt_status;
 342         }
 343
 344         case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
 345         {
 346                 DATA_BLOB unwrapped_in;
 347                 krb5_data inbuf;
 348                 krb5_ap_rep_enc_part *repl = NULL;
 349                 uint8_t tok_id[2];
 350
 351                 if (gensec_krb5_state->gssapi) {
 352                         if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 353                                 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
 354                                 dump_data_pw("Mutual authentication message:\n", in.data, in.length);
 355                                 return NT_STATUS_INVALID_PARAMETER;
 356                         }
 357                 } else {
 358                         unwrapped_in = in;
 359                 }
 360                 /* TODO: check the tok_id */
 361
 362                 inbuf.data = unwrapped_in.data;
 363                 inbuf.length = unwrapped_in.length;
 364                 ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context,
 365                                   gensec_krb5_state->auth_context,
 366                                   &inbuf, &repl);
 367                 if (ret) {
 368                         DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
 369                                  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
 370                         dump_data_pw("Mutual authentication message:\n", inbuf.data, inbuf.length);
 371                         nt_status = NT_STATUS_ACCESS_DENIED;
 372                 } else {
 373                         *out = data_blob(NULL, 0);
 374                         nt_status = NT_STATUS_OK;
 375                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 376                 }
 377                 if (repl) {
 378                         krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
 379                 }
 380                 return nt_status;
 381         }
 382
 383         case GENSEC_KRB5_SERVER_START:
 384         {
 385                 DATA_BLOB unwrapped_in;
 386                 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 387                 uint8_t tok_id[2];
 388
 389                 if (!in.data) {
 390                         return NT_STATUS_INVALID_PARAMETER;
 391                 }
 392
 393                 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
 394                 if (gensec_krb5_state->gssapi
 395                     && gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 396                         nt_status = ads_verify_ticket(out_mem_ctx,
 397                                                       gensec_krb5_state->smb_krb5_context,
 398                                                       &gensec_krb5_state->auth_context,
 399                                                       gensec_get_credentials(gensec_security),
 400                                                       gensec_get_target_service(gensec_security), &unwrapped_in,
 401                                                       &gensec_krb5_state->ticket, &unwrapped_out,
 402                                                       &gensec_krb5_state->keyblock);
 403                 } else {
 404                         /* TODO: check the tok_id */
 405                         nt_status = ads_verify_ticket(out_mem_ctx,
 406                                                       gensec_krb5_state->smb_krb5_context,
 407                                                       &gensec_krb5_state->auth_context,
 408                                                       gensec_get_credentials(gensec_security),
 409                                                       gensec_get_target_service(gensec_security),
 410                                                       &in,
 411                                                       &gensec_krb5_state->ticket, &unwrapped_out,
 412                                                       &gensec_krb5_state->keyblock);
 413                 }
 414
 415                 if (!NT_STATUS_IS_OK(nt_status)) {
 416                         return nt_status;
 417                 }
 418
 419                 if (NT_STATUS_IS_OK(nt_status)) {
 420                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 421                         /* wrap that up in a nice GSS-API wrapping */
 422                         if (gensec_krb5_state->gssapi) {
 423                                 *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
 424                         } else {
 425                                 *out = unwrapped_out;
 426                         }
 427                 }
 428                 return nt_status;
 429         }
 430         case GENSEC_KRB5_DONE:
 431                 return NT_STATUS_OK;
 432         }
 433
 434         return NT_STATUS_INVALID_PARAMETER;
 435 }
 436
 437 static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
 438                                         DATA_BLOB *session_key)
 439 {
 440         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 441         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 442         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 443         krb5_keyblock *skey;
 444         krb5_error_code err = -1;
 445
 446         if (gensec_krb5_state->session_key.data) {
 447                 *session_key = gensec_krb5_state->session_key;
 448                 return NT_STATUS_OK;
 449         }
 450
 451         switch (gensec_security->gensec_role) {
 452         case GENSEC_CLIENT:
 453                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 454                 break;
 455         case GENSEC_SERVER:
 456                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 457                 break;
 458         }
 459         if (err == 0 && skey != NULL) {
 460                 DEBUG(10, ("Got KRB5 session key of length %d\n",
 461                            (int)KRB5_KEY_LENGTH(skey)));
 462                 gensec_krb5_state->session_key = data_blob_talloc(gensec_krb5_state,
 463                                                 KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 464                 *session_key = gensec_krb5_state->session_key;
 465                 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 466
 467                 krb5_free_keyblock(context, skey);
 468                 return NT_STATUS_OK;
 469         } else {
 470                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 471                 return NT_STATUS_NO_USER_SESSION_KEY;
 472         }
 473 }
 474
 475 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
 476                                          struct auth_session_info **_session_info)
 477 {
 478         NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
 479         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 480         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 481         struct auth_serversupplied_info *server_info = NULL;
 482         struct auth_session_info *session_info = NULL;
 483         struct PAC_LOGON_INFO *logon_info;
 484
 485         krb5_principal client_principal;
 486
 487         DATA_BLOB pac;
 488         krb5_data pac_data;
 489
 490         krb5_error_code ret;
 491
 492         TALLOC_CTX *mem_ctx = talloc_new(gensec_security);
 493         if (!mem_ctx) {
 494                 return NT_STATUS_NO_MEMORY;
 495         }
 496
 497         ret = krb5_ticket_get_authorization_data_type(context, gensec_krb5_state->ticket,
 498                                                       KRB5_AUTHDATA_WIN2K_PAC,
 499                                                       &pac_data);
 500
 501         if (ret) {
 502                 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
 503                           smb_get_krb5_error_message(context,
 504                                                      ret, mem_ctx)));
 505         } else {
 506                 pac = data_blob_talloc(mem_ctx, pac_data.data, pac_data.length);
 507                 if (!pac.data) {
 508                         return NT_STATUS_NO_MEMORY;
 509                 }
 510
 511                 ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
 512                 if (ret) {
 513                         DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
 514                                   smb_get_krb5_error_message(context,
 515                                                              ret, mem_ctx)));
 516                         return NT_STATUS_NO_MEMORY;
 517                 }
 518
 519                 /* decode and verify the pac */
 520                 nt_status = kerberos_pac_logon_info(gensec_krb5_state, &logon_info, pac,
 521                                                     gensec_krb5_state->smb_krb5_context->krb5_context,
 522                                                     NULL, gensec_krb5_state->keyblock,
 523                                                     client_principal,
 524                                                     gensec_krb5_state->ticket->ticket.authtime);
 525                 krb5_free_principal(context, client_principal);
 526
 527                 if (NT_STATUS_IS_OK(nt_status)) {
 528                         union netr_Validation validation;
 529                         validation.sam3 = &logon_info->info3;
 530                         nt_status = make_server_info_netlogon_validation(gensec_krb5_state,
 531                                                                          NULL,
 532                                                                          3, &validation,
 533                                                                          &server_info);
 534                 }
 535                 talloc_free(mem_ctx);
 536         }
 537
 538
 539
 540         /* IF we have the PAC - otherwise we need to get this
 541          * data from elsewere - local ldb, or (TODO) lookup of some
 542          * kind...
 543          */
 544         if (!NT_STATUS_IS_OK(nt_status)) {
 545                 /* NO pac, or can't parse or verify it */
 546                 char *principal_string;
 547                 ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
 548                 if (ret) {
 549                         DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
 550                                   smb_get_krb5_error_message(context,
 551                                                              ret, mem_ctx)));
 552                         return NT_STATUS_NO_MEMORY;
 553                 }
 554
 555                 ret = krb5_unparse_name(gensec_krb5_state->smb_krb5_context->krb5_context,
 556                                         client_principal, &principal_string);
 557                 krb5_free_principal(context, client_principal);
 558                 if (ret) {
 559                         return NT_STATUS_NO_MEMORY;
 560                 }
 561
 562                 nt_status = sam_get_server_info_principal(mem_ctx, principal_string,
 563                                                           &server_info);
 564                 free(principal_string);
 565
 566                 if (!NT_STATUS_IS_OK(nt_status)) {
 567                         talloc_free(mem_ctx);
 568                         return nt_status;
 569                 }
 570         }
 571
 572         /* references the server_info into the session_info */
 573         nt_status = auth_generate_session_info(gensec_krb5_state, server_info, &session_info);
 574         talloc_free(mem_ctx);
 575
 576         NT_STATUS_NOT_OK_RETURN(nt_status);
 577
 578         nt_status = gensec_krb5_session_key(gensec_security, &session_info->session_key);
 579         NT_STATUS_NOT_OK_RETURN(nt_status);
 580
 581         *_session_info = session_info;
 582
 583         return NT_STATUS_OK;
 584 }
 585
 586 static NTSTATUS gensec_krb5_wrap(struct gensec_security *gensec_security,
 587                                    TALLOC_CTX *mem_ctx,
 588                                    const DATA_BLOB *in,
 589                                    DATA_BLOB *out)
 590 {
 591         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 592         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 593         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 594         krb5_error_code ret;
 595         krb5_data input, output;
 596         input.length = in->length;
 597         input.data = in->data;
 598
 599         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 600                 ret = krb5_mk_priv(context, auth_context, &input, &output, NULL);
 601                 if (ret) {
 602                         DEBUG(1, ("krb5_mk_priv failed: %s\n",
 603                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 604                                                              ret, mem_ctx)));
 605                         return NT_STATUS_ACCESS_DENIED;
 606                 }
 607                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
 608
 609                 krb5_data_free(&output);
 610         } else {
 611                 return NT_STATUS_ACCESS_DENIED;
 612         }
 613         return NT_STATUS_OK;
 614 }
 615
 616 static NTSTATUS gensec_krb5_unwrap(struct gensec_security *gensec_security,
 617                                      TALLOC_CTX *mem_ctx,
 618                                      const DATA_BLOB *in,
 619                                      DATA_BLOB *out)
 620 {
 621         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 622         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 623         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 624         krb5_error_code ret;
 625         krb5_data input, output;
 626         krb5_replay_data replay;
 627         input.length = in->length;
 628         input.data = in->data;
 629
 630         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 631                 ret = krb5_rd_priv(context, auth_context, &input, &output, &replay);
 632                 if (ret) {
 633                         DEBUG(1, ("krb5_rd_priv failed: %s\n",
 634                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 635                                                              ret, mem_ctx)));
 636                         return NT_STATUS_ACCESS_DENIED;
 637                 }
 638                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
 639
 640                 krb5_data_free(&output);
 641         } else {
 642                 return NT_STATUS_ACCESS_DENIED;
 643         }
 644         return NT_STATUS_OK;
 645 }
 646
 647 static BOOL gensec_krb5_have_feature(struct gensec_security *gensec_security,
 648                                      uint32_t feature)
 649 {
 650         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 651         if (feature & GENSEC_FEATURE_SESSION_KEY) {
 652                 return True;
 653         }
 654         if (!gensec_krb5_state->gssapi &&
 655             (feature & GENSEC_FEATURE_SEAL)) {
 656                 return True;
 657         }
 658
 659         return False;
 660 }
 661
 662 static const char *gensec_krb5_oids[] = {
 663         GENSEC_OID_KERBEROS5,
 664         GENSEC_OID_KERBEROS5_OLD,
 665         NULL
 666 };
 667
 668 static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops = {
 669         .name           = "fake_gssapi_krb5",
 670         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
 671         .oid            = gensec_krb5_oids,
 672         .client_start   = gensec_fake_gssapi_krb5_client_start,
 673         .server_start   = gensec_fake_gssapi_krb5_server_start,
 674         .update         = gensec_krb5_update,
 675         .magic          = gensec_fake_gssapi_krb5_magic,
 676         .session_key    = gensec_krb5_session_key,
 677         .session_info   = gensec_krb5_session_info,
 678         .have_feature   = gensec_krb5_have_feature,
 679         .enabled        = False
 680 };
 681
 682 static const struct gensec_security_ops gensec_krb5_security_ops = {
 683         .name           = "krb5",
 684         .client_start   = gensec_krb5_client_start,
 685         .server_start   = gensec_krb5_server_start,
 686         .update         = gensec_krb5_update,
 687         .session_key    = gensec_krb5_session_key,
 688         .session_info   = gensec_krb5_session_info,
 689         .have_feature   = gensec_krb5_have_feature,
 690         .wrap           = gensec_krb5_wrap,
 691         .unwrap         = gensec_krb5_unwrap,
 692         .enabled        = True
 693 };
 694
 695 NTSTATUS gensec_krb5_init(void)
 696 {
 697         NTSTATUS ret;
 698
 699         ret = gensec_register(&gensec_krb5_security_ops);
 700         if (!NT_STATUS_IS_OK(ret)) {
 701                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 702                         gensec_krb5_security_ops.name));
 703                 return ret;
 704         }
 705
 706         ret = gensec_register(&gensec_fake_gssapi_krb5_security_ops);
 707         if (!NT_STATUS_IS_OK(ret)) {
 708                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 709                         gensec_krb5_security_ops.name));
 710                 return ret;
 711         }
 712
 713         return ret;
 714 }