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 "auth/kerberos/kerberos.h"
  30 #include "librpc/gen_ndr/krb5pac.h"
  31 #include "auth/auth.h"
  32 #include "lib/ldb/include/ldb.h"
  33 #include "auth/auth_sam.h"
  34 #include "system/network.h"
  35 #include "lib/socket/socket.h"
  36 #include "librpc/rpc/dcerpc.h"
  37
  38 enum GENSEC_KRB5_STATE {
  39         GENSEC_KRB5_SERVER_START,
  40         GENSEC_KRB5_CLIENT_START,
  41         GENSEC_KRB5_CLIENT_MUTUAL_AUTH,
  42         GENSEC_KRB5_DONE
  43 };
  44
  45 struct gensec_krb5_state {
  46         DATA_BLOB session_key;
  47         DATA_BLOB pac;
  48         enum GENSEC_KRB5_STATE state_position;
  49         struct smb_krb5_context *smb_krb5_context;
  50         krb5_auth_context auth_context;
  51         krb5_data enc_ticket;
  52         krb5_keyblock *keyblock;
  53         krb5_ticket *ticket;
  54         BOOL gssapi;
  55 };
  56
  57 static int gensec_krb5_destroy(struct gensec_krb5_state *gensec_krb5_state)
  58 {
  59         if (!gensec_krb5_state->smb_krb5_context) {
  60                 /* We can't clean anything else up unless we started up this far */
  61                 return 0;
  62         }
  63         if (gensec_krb5_state->enc_ticket.length) {
  64                 kerberos_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
  65                                             &gensec_krb5_state->enc_ticket);
  66         }
  67
  68         if (gensec_krb5_state->ticket) {
  69                 krb5_free_ticket(gensec_krb5_state->smb_krb5_context->krb5_context,
  70                                  gensec_krb5_state->ticket);
  71         }
  72
  73         /* ccache freed in a child destructor */
  74
  75         krb5_free_keyblock(gensec_krb5_state->smb_krb5_context->krb5_context,
  76                            gensec_krb5_state->keyblock);
  77
  78         if (gensec_krb5_state->auth_context) {
  79                 krb5_auth_con_free(gensec_krb5_state->smb_krb5_context->krb5_context,
  80                                    gensec_krb5_state->auth_context);
  81         }
  82
  83         return 0;
  84 }
  85
  86 static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security)
  87 {
  88         krb5_error_code ret;
  89         struct gensec_krb5_state *gensec_krb5_state;
  90         struct cli_credentials *creds;
  91         const struct socket_address *my_addr, *peer_addr;
  92         krb5_address my_krb5_addr, peer_krb5_addr;
  93
  94         creds = gensec_get_credentials(gensec_security);
  95         if (!creds) {
  96                 return NT_STATUS_INVALID_PARAMETER;
  97         }
  98
  99         gensec_krb5_state = talloc(gensec_security, struct gensec_krb5_state);
 100         if (!gensec_krb5_state) {
 101                 return NT_STATUS_NO_MEMORY;
 102         }
 103
 104         gensec_security->private_data = gensec_krb5_state;
 105         gensec_krb5_state->smb_krb5_context = NULL;
 106         gensec_krb5_state->auth_context = NULL;
 107         gensec_krb5_state->ticket = NULL;
 108         ZERO_STRUCT(gensec_krb5_state->enc_ticket);
 109         gensec_krb5_state->keyblock = NULL;
 110         gensec_krb5_state->session_key = data_blob(NULL, 0);
 111         gensec_krb5_state->pac = data_blob(NULL, 0);
 112         gensec_krb5_state->gssapi = False;
 113
 114         talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
 115
 116         if (cli_credentials_get_krb5_context(creds, &gensec_krb5_state->smb_krb5_context)) {
 117                 talloc_free(gensec_krb5_state);
 118                 return NT_STATUS_INTERNAL_ERROR;
 119         }
 120
 121         ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
 122         if (ret) {
 123                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
 124                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 125                                                     ret, gensec_krb5_state)));
 126                 talloc_free(gensec_krb5_state);
 127                 return NT_STATUS_INTERNAL_ERROR;
 128         }
 129
 130         ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
 131                                      gensec_krb5_state->auth_context,
 132                                      KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 133         if (ret) {
 134                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
 135                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 136                                                     ret, gensec_krb5_state)));
 137                 talloc_free(gensec_krb5_state);
 138                 return NT_STATUS_INTERNAL_ERROR;
 139         }
 140
 141         my_addr = gensec_get_my_addr(gensec_security);
 142         if (my_addr && my_addr->sockaddr) {
 143                 ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
 144                                             my_addr->sockaddr, &my_krb5_addr);
 145                 if (ret) {
 146                         DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
 147                                  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 148                                                             ret, gensec_krb5_state)));
 149                         talloc_free(gensec_krb5_state);
 150                         return NT_STATUS_INTERNAL_ERROR;
 151                 }
 152         }
 153
 154         peer_addr = gensec_get_peer_addr(gensec_security);
 155         if (peer_addr && peer_addr->sockaddr) {
 156                 ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
 157                                             peer_addr->sockaddr, &peer_krb5_addr);
 158                 if (ret) {
 159                         DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
 160                                  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 161                                                             ret, gensec_krb5_state)));
 162                         talloc_free(gensec_krb5_state);
 163                         return NT_STATUS_INTERNAL_ERROR;
 164                 }
 165         }
 166
 167         ret = krb5_auth_con_setaddrs(gensec_krb5_state->smb_krb5_context->krb5_context,
 168                                      gensec_krb5_state->auth_context,
 169                                      my_addr ? &my_krb5_addr : NULL,
 170                                      peer_addr ? &peer_krb5_addr : NULL);
 171         if (ret) {
 172                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
 173                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 174                                                     ret, gensec_krb5_state)));
 175                 talloc_free(gensec_krb5_state);
 176                 return NT_STATUS_INTERNAL_ERROR;
 177         }
 178
 179         return NT_STATUS_OK;
 180 }
 181
 182 static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
 183 {
 184         NTSTATUS nt_status;
 185         struct gensec_krb5_state *gensec_krb5_state;
 186
 187         nt_status = gensec_krb5_start(gensec_security);
 188         if (!NT_STATUS_IS_OK(nt_status)) {
 189                 return nt_status;
 190         }
 191
 192         gensec_krb5_state = gensec_security->private_data;
 193         gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
 194
 195         return NT_STATUS_OK;
 196 }
 197
 198 static NTSTATUS gensec_fake_gssapi_krb5_server_start(struct gensec_security *gensec_security)
 199 {
 200         NTSTATUS nt_status = gensec_krb5_server_start(gensec_security);
 201
 202         if (NT_STATUS_IS_OK(nt_status)) {
 203                 struct gensec_krb5_state *gensec_krb5_state;
 204                 gensec_krb5_state = gensec_security->private_data;
 205                 gensec_krb5_state->gssapi = True;
 206         }
 207         return nt_status;
 208 }
 209
 210 static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security)
 211 {
 212         struct gensec_krb5_state *gensec_krb5_state;
 213         krb5_error_code ret;
 214         NTSTATUS nt_status;
 215         struct ccache_container *ccache_container;
 216         const char *hostname;
 217         krb5_flags ap_req_options = AP_OPTS_USE_SUBKEY | AP_OPTS_MUTUAL_REQUIRED;
 218
 219         const char *principal;
 220         krb5_data in_data;
 221
 222         hostname = gensec_get_target_hostname(gensec_security);
 223         if (!hostname) {
 224                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 225                 return NT_STATUS_INVALID_PARAMETER;
 226         }
 227         if (is_ipaddress(hostname)) {
 228                 DEBUG(2, ("Cannot do krb5 to an IP address"));
 229                 return NT_STATUS_INVALID_PARAMETER;
 230         }
 231         if (strcmp(hostname, "localhost") == 0) {
 232                 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
 233                 return NT_STATUS_INVALID_PARAMETER;
 234         }
 235
 236         nt_status = gensec_krb5_start(gensec_security);
 237         if (!NT_STATUS_IS_OK(nt_status)) {
 238                 return nt_status;
 239         }
 240
 241         gensec_krb5_state = gensec_security->private_data;
 242         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
 243
 244         ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security), &ccache_container);
 245         if (ret) {
 246                 DEBUG(1,("gensec_krb5_start: cli_credentials_get_ccache failed: %s\n",
 247                          error_message(ret)));
 248                 return NT_STATUS_UNSUCCESSFUL;
 249         }
 250
 251         in_data.length = 0;
 252
 253         principal = gensec_get_target_principal(gensec_security);
 254         if (principal && lp_client_use_spnego_principal()) {
 255                 krb5_principal target_principal;
 256                 ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
 257                                       &target_principal);
 258                 if (ret == 0) {
 259                         ret = krb5_mk_req_exact(gensec_krb5_state->smb_krb5_context->krb5_context,
 260                                                 &gensec_krb5_state->auth_context,
 261                                                 ap_req_options,
 262                                                 target_principal,
 263                                                 &in_data, ccache_container->ccache,
 264                                                 &gensec_krb5_state->enc_ticket);
 265                         krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 266                                             target_principal);
 267                 }
 268         } else {
 269                 ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
 270                                   &gensec_krb5_state->auth_context,
 271                                   ap_req_options,
 272                                   gensec_get_target_service(gensec_security),
 273                                   hostname,
 274                                   &in_data, ccache_container->ccache,
 275                                   &gensec_krb5_state->enc_ticket);
 276         }
 277         switch (ret) {
 278         case 0:
 279                 return NT_STATUS_OK;
 280         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 281                 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
 282                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 283                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 284         case KRB5_KDC_UNREACH:
 285                 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
 286                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 287                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 288         case KRB5KDC_ERR_PREAUTH_FAILED:
 289         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 290         case KRB5_CC_END:
 291                 /* Too much clock skew - we will need to kinit to re-skew the clock */
 292         case KRB5KRB_AP_ERR_SKEW:
 293         case KRB5_KDCREP_SKEW:
 294         {
 295                 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
 296                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 297                 /*fall through*/
 298         }
 299
 300         /* just don't print a message for these really ordinary messages */
 301         case KRB5_FCC_NOFILE:
 302         case KRB5_CC_NOTFOUND:
 303         case ENOENT:
 304
 305                 return NT_STATUS_UNSUCCESSFUL;
 306                 break;
 307
 308         default:
 309                 DEBUG(0, ("kerberos: %s\n",
 310                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 311                 return NT_STATUS_UNSUCCESSFUL;
 312         }
 313 }
 314
 315 static NTSTATUS gensec_fake_gssapi_krb5_client_start(struct gensec_security *gensec_security)
 316 {
 317         NTSTATUS nt_status = gensec_krb5_client_start(gensec_security);
 318
 319         if (NT_STATUS_IS_OK(nt_status)) {
 320                 struct gensec_krb5_state *gensec_krb5_state;
 321                 gensec_krb5_state = gensec_security->private_data;
 322                 gensec_krb5_state->gssapi = True;
 323         }
 324         return nt_status;
 325 }
 326
 327 /**
 328  * Check if the packet is one for this mechansim
 329  *
 330  * @param gensec_security GENSEC state
 331  * @param in The request, as a DATA_BLOB
 332  * @return Error, INVALID_PARAMETER if it's not a packet for us
 333  *                or NT_STATUS_OK if the packet is ok.
 334  */
 335
 336 static NTSTATUS gensec_fake_gssapi_krb5_magic(struct gensec_security *gensec_security,
 337                                   const DATA_BLOB *in)
 338 {
 339         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 340                 return NT_STATUS_OK;
 341         } else {
 342                 return NT_STATUS_INVALID_PARAMETER;
 343         }
 344 }
 345
 346
 347 /**
 348  * Next state function for the Krb5 GENSEC mechanism
 349  *
 350  * @param gensec_krb5_state KRB5 State
 351  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 352  * @param in The request, as a DATA_BLOB
 353  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 354  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 355  *                or NT_STATUS_OK if the user is authenticated.
 356  */
 357
 358 static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
 359                                    TALLOC_CTX *out_mem_ctx,
 360                                    const DATA_BLOB in, DATA_BLOB *out)
 361 {
 362         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 363         krb5_error_code ret = 0;
 364         NTSTATUS nt_status;
 365
 366         switch (gensec_krb5_state->state_position) {
 367         case GENSEC_KRB5_CLIENT_START:
 368         {
 369                 DATA_BLOB unwrapped_out;
 370
 371                 if (gensec_krb5_state->gssapi) {
 372                         unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 373
 374                         /* wrap that up in a nice GSS-API wrapping */
 375                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
 376                 } else {
 377                         *out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 378                 }
 379                 gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
 380                 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 381                 return nt_status;
 382         }
 383
 384         case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
 385         {
 386                 DATA_BLOB unwrapped_in;
 387                 krb5_data inbuf;
 388                 krb5_ap_rep_enc_part *repl = NULL;
 389                 uint8_t tok_id[2];
 390
 391                 if (gensec_krb5_state->gssapi) {
 392                         if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 393                                 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
 394                                 dump_data_pw("Mutual authentication message:\n", in.data, in.length);
 395                                 return NT_STATUS_INVALID_PARAMETER;
 396                         }
 397                 } else {
 398                         unwrapped_in = in;
 399                 }
 400                 /* TODO: check the tok_id */
 401
 402                 inbuf.data = unwrapped_in.data;
 403                 inbuf.length = unwrapped_in.length;
 404                 ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context,
 405                                   gensec_krb5_state->auth_context,
 406                                   &inbuf, &repl);
 407                 if (ret) {
 408                         DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
 409                                  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
 410                         dump_data_pw("Mutual authentication message:\n", inbuf.data, inbuf.length);
 411                         nt_status = NT_STATUS_ACCESS_DENIED;
 412                 } else {
 413                         *out = data_blob(NULL, 0);
 414                         nt_status = NT_STATUS_OK;
 415                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 416                 }
 417                 if (repl) {
 418                         krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
 419                 }
 420                 return nt_status;
 421         }
 422
 423         case GENSEC_KRB5_SERVER_START:
 424         {
 425                 DATA_BLOB unwrapped_in;
 426                 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 427                 uint8_t tok_id[2];
 428
 429                 if (!in.data) {
 430                         return NT_STATUS_INVALID_PARAMETER;
 431                 }
 432
 433                 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
 434                 if (gensec_krb5_state->gssapi
 435                     && gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 436                         nt_status = ads_verify_ticket(out_mem_ctx,
 437                                                       gensec_krb5_state->smb_krb5_context,
 438                                                       &gensec_krb5_state->auth_context,
 439                                                       gensec_get_credentials(gensec_security),
 440                                                       gensec_get_target_service(gensec_security), &unwrapped_in,
 441                                                       &gensec_krb5_state->ticket, &unwrapped_out,
 442                                                       &gensec_krb5_state->keyblock);
 443                 } else {
 444                         /* TODO: check the tok_id */
 445                         nt_status = ads_verify_ticket(out_mem_ctx,
 446                                                       gensec_krb5_state->smb_krb5_context,
 447                                                       &gensec_krb5_state->auth_context,
 448                                                       gensec_get_credentials(gensec_security),
 449                                                       gensec_get_target_service(gensec_security),
 450                                                       &in,
 451                                                       &gensec_krb5_state->ticket, &unwrapped_out,
 452                                                       &gensec_krb5_state->keyblock);
 453                 }
 454
 455                 if (!NT_STATUS_IS_OK(nt_status)) {
 456                         return nt_status;
 457                 }
 458
 459                 if (NT_STATUS_IS_OK(nt_status)) {
 460                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 461                         /* wrap that up in a nice GSS-API wrapping */
 462                         if (gensec_krb5_state->gssapi) {
 463                                 *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
 464                         } else {
 465                                 *out = unwrapped_out;
 466                         }
 467                 }
 468                 return nt_status;
 469         }
 470
 471         case GENSEC_KRB5_DONE:
 472         default:
 473                 /* Asking too many times... */
 474                 return NT_STATUS_INVALID_PARAMETER;
 475         }
 476 }
 477
 478 static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
 479                                         DATA_BLOB *session_key)
 480 {
 481         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 482         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 483         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 484         krb5_keyblock *skey;
 485         krb5_error_code err = -1;
 486
 487         if (gensec_krb5_state->session_key.data) {
 488                 *session_key = gensec_krb5_state->session_key;
 489                 return NT_STATUS_OK;
 490         }
 491
 492         switch (gensec_security->gensec_role) {
 493         case GENSEC_CLIENT:
 494                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 495                 break;
 496         case GENSEC_SERVER:
 497                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 498                 break;
 499         }
 500         if (err == 0 && skey != NULL) {
 501                 DEBUG(10, ("Got KRB5 session key of length %d\n",
 502                            (int)KRB5_KEY_LENGTH(skey)));
 503                 gensec_krb5_state->session_key = data_blob_talloc(gensec_krb5_state,
 504                                                 KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 505                 *session_key = gensec_krb5_state->session_key;
 506                 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 507
 508                 krb5_free_keyblock(context, skey);
 509                 return NT_STATUS_OK;
 510         } else {
 511                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 512                 return NT_STATUS_NO_USER_SESSION_KEY;
 513         }
 514 }
 515
 516 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
 517                                          struct auth_session_info **_session_info)
 518 {
 519         NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
 520         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 521         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 522         struct auth_serversupplied_info *server_info = NULL;
 523         struct auth_session_info *session_info = NULL;
 524         struct PAC_LOGON_INFO *logon_info;
 525
 526         krb5_principal client_principal;
 527
 528         DATA_BLOB pac;
 529         krb5_data pac_data;
 530
 531         krb5_error_code ret;
 532
 533         TALLOC_CTX *mem_ctx = talloc_new(gensec_security);
 534         if (!mem_ctx) {
 535                 return NT_STATUS_NO_MEMORY;
 536         }
 537
 538         ret = krb5_ticket_get_authorization_data_type(context, gensec_krb5_state->ticket,
 539                                                       KRB5_AUTHDATA_WIN2K_PAC,
 540                                                       &pac_data);
 541
 542         if (ret) {
 543                 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
 544                           smb_get_krb5_error_message(context,
 545                                                      ret, mem_ctx)));
 546         } else {
 547                 pac = data_blob_talloc(mem_ctx, pac_data.data, pac_data.length);
 548                 if (!pac.data) {
 549                         talloc_free(mem_ctx);
 550                         return NT_STATUS_NO_MEMORY;
 551                 }
 552
 553                 ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
 554                 if (ret) {
 555                         DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
 556                                   smb_get_krb5_error_message(context,
 557                                                              ret, mem_ctx)));
 558                         talloc_free(mem_ctx);
 559                         return NT_STATUS_NO_MEMORY;
 560                 }
 561
 562                 /* decode and verify the pac */
 563                 nt_status = kerberos_pac_logon_info(gensec_krb5_state, &logon_info, pac,
 564                                                     gensec_krb5_state->smb_krb5_context->krb5_context,
 565                                                     NULL, gensec_krb5_state->keyblock,
 566                                                     client_principal,
 567                                                     gensec_krb5_state->ticket->ticket.authtime, NULL);
 568                 krb5_free_principal(context, client_principal);
 569
 570                 if (NT_STATUS_IS_OK(nt_status)) {
 571                         union netr_Validation validation;
 572                         validation.sam3 = &logon_info->info3;
 573                         nt_status = make_server_info_netlogon_validation(mem_ctx,
 574                                                                          NULL,
 575                                                                          3, &validation,
 576                                                                          &server_info);
 577                 }
 578         }
 579
 580
 581
 582         /* IF we have the PAC - otherwise we need to get this
 583          * data from elsewere - local ldb, or (TODO) lookup of some
 584          * kind...
 585          */
 586         if (!NT_STATUS_IS_OK(nt_status)) {
 587                 /* NO pac, or can't parse or verify it */
 588                 char *principal_string;
 589                 ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
 590                 if (ret) {
 591                         DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
 592                                   smb_get_krb5_error_message(context,
 593                                                              ret, mem_ctx)));
 594                         talloc_free(mem_ctx);
 595                         return NT_STATUS_NO_MEMORY;
 596                 }
 597
 598                 ret = krb5_unparse_name(gensec_krb5_state->smb_krb5_context->krb5_context,
 599                                         client_principal, &principal_string);
 600                 krb5_free_principal(context, client_principal);
 601                 if (ret) {
 602                         talloc_free(mem_ctx);
 603                         return NT_STATUS_NO_MEMORY;
 604                 }
 605
 606                 nt_status = sam_get_server_info_principal(mem_ctx, principal_string,
 607                                                           &server_info);
 608                 free(principal_string);
 609
 610                 if (!NT_STATUS_IS_OK(nt_status)) {
 611                         talloc_free(mem_ctx);
 612                         return nt_status;
 613                 }
 614         }
 615
 616         /* references the server_info into the session_info */
 617         nt_status = auth_generate_session_info(mem_ctx, server_info, &session_info);
 618
 619         if (!NT_STATUS_IS_OK(nt_status)) {
 620                 talloc_free(mem_ctx);
 621                 return nt_status;
 622         }
 623
 624         nt_status = gensec_krb5_session_key(gensec_security, &session_info->session_key);
 625
 626         if (!NT_STATUS_IS_OK(nt_status)) {
 627                 talloc_free(mem_ctx);
 628                 return nt_status;
 629         }
 630
 631         *_session_info = session_info;
 632
 633         talloc_steal(gensec_krb5_state, session_info);
 634         talloc_free(mem_ctx);
 635         return NT_STATUS_OK;
 636 }
 637
 638 static NTSTATUS gensec_krb5_wrap(struct gensec_security *gensec_security,
 639                                    TALLOC_CTX *mem_ctx,
 640                                    const DATA_BLOB *in,
 641                                    DATA_BLOB *out)
 642 {
 643         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 644         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 645         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 646         krb5_error_code ret;
 647         krb5_data input, output;
 648         input.length = in->length;
 649         input.data = in->data;
 650
 651         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 652                 ret = krb5_mk_priv(context, auth_context, &input, &output, NULL);
 653                 if (ret) {
 654                         DEBUG(1, ("krb5_mk_priv failed: %s\n",
 655                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 656                                                              ret, mem_ctx)));
 657                         return NT_STATUS_ACCESS_DENIED;
 658                 }
 659                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
 660
 661                 krb5_data_free(&output);
 662         } else {
 663                 return NT_STATUS_ACCESS_DENIED;
 664         }
 665         return NT_STATUS_OK;
 666 }
 667
 668 static NTSTATUS gensec_krb5_unwrap(struct gensec_security *gensec_security,
 669                                      TALLOC_CTX *mem_ctx,
 670                                      const DATA_BLOB *in,
 671                                      DATA_BLOB *out)
 672 {
 673         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 674         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 675         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 676         krb5_error_code ret;
 677         krb5_data input, output;
 678         krb5_replay_data replay;
 679         input.length = in->length;
 680         input.data = in->data;
 681
 682         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 683                 ret = krb5_rd_priv(context, auth_context, &input, &output, &replay);
 684                 if (ret) {
 685                         DEBUG(1, ("krb5_rd_priv failed: %s\n",
 686                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 687                                                              ret, mem_ctx)));
 688                         return NT_STATUS_ACCESS_DENIED;
 689                 }
 690                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
 691
 692                 krb5_data_free(&output);
 693         } else {
 694                 return NT_STATUS_ACCESS_DENIED;
 695         }
 696         return NT_STATUS_OK;
 697 }
 698
 699 static BOOL gensec_krb5_have_feature(struct gensec_security *gensec_security,
 700                                      uint32_t feature)
 701 {
 702         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 703         if (feature & GENSEC_FEATURE_SESSION_KEY) {
 704                 return True;
 705         }
 706         if (!gensec_krb5_state->gssapi &&
 707             (feature & GENSEC_FEATURE_SEAL)) {
 708                 return True;
 709         }
 710
 711         return False;
 712 }
 713
 714 static const char *gensec_krb5_oids[] = {
 715         GENSEC_OID_KERBEROS5,
 716         GENSEC_OID_KERBEROS5_OLD,
 717         NULL
 718 };
 719
 720 static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops = {
 721         .name           = "fake_gssapi_krb5",
 722         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
 723         .oid            = gensec_krb5_oids,
 724         .client_start   = gensec_fake_gssapi_krb5_client_start,
 725         .server_start   = gensec_fake_gssapi_krb5_server_start,
 726         .update         = gensec_krb5_update,
 727         .magic          = gensec_fake_gssapi_krb5_magic,
 728         .session_key    = gensec_krb5_session_key,
 729         .session_info   = gensec_krb5_session_info,
 730         .have_feature   = gensec_krb5_have_feature,
 731         .enabled        = False,
 732         .kerberos       = True,
 733         .order          = GENSEC_KRB5
 734 };
 735
 736 static const struct gensec_security_ops gensec_krb5_security_ops = {
 737         .name           = "krb5",
 738         .client_start   = gensec_krb5_client_start,
 739         .server_start   = gensec_krb5_server_start,
 740         .update         = gensec_krb5_update,
 741         .session_key    = gensec_krb5_session_key,
 742         .session_info   = gensec_krb5_session_info,
 743         .have_feature   = gensec_krb5_have_feature,
 744         .wrap           = gensec_krb5_wrap,
 745         .unwrap         = gensec_krb5_unwrap,
 746         .enabled        = True,
 747         .kerberos       = True,
 748         .order          = GENSEC_KRB5
 749 };
 750
 751 NTSTATUS gensec_krb5_init(void)
 752 {
 753         NTSTATUS ret;
 754
 755         auth_init();
 756
 757         ret = gensec_register(&gensec_krb5_security_ops);
 758         if (!NT_STATUS_IS_OK(ret)) {
 759                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 760                         gensec_krb5_security_ops.name));
 761                 return ret;
 762         }
 763
 764         ret = gensec_register(&gensec_fake_gssapi_krb5_security_ops);
 765         if (!NT_STATUS_IS_OK(ret)) {
 766                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 767                         gensec_krb5_security_ops.name));
 768                 return ret;
 769         }
 770
 771         return ret;
 772 }