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(void *ptr)
  58 {
  59         struct gensec_krb5_state *gensec_krb5_state = ptr;
  60
  61         if (!gensec_krb5_state->smb_krb5_context) {
  62                 /* We can't clean anything else up unless we started up this far */
  63                 return 0;
  64         }
  65         if (gensec_krb5_state->enc_ticket.length) {
  66                 kerberos_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
  67                                             &gensec_krb5_state->enc_ticket);
  68         }
  69
  70         if (gensec_krb5_state->ticket) {
  71                 krb5_free_ticket(gensec_krb5_state->smb_krb5_context->krb5_context,
  72                                  gensec_krb5_state->ticket);
  73         }
  74
  75         /* ccache freed in a child destructor */
  76
  77         krb5_free_keyblock(gensec_krb5_state->smb_krb5_context->krb5_context,
  78                            gensec_krb5_state->keyblock);
  79
  80         if (gensec_krb5_state->auth_context) {
  81                 krb5_auth_con_free(gensec_krb5_state->smb_krb5_context->krb5_context,
  82                                    gensec_krb5_state->auth_context);
  83         }
  84
  85         return 0;
  86 }
  87
  88 static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security)
  89 {
  90         krb5_error_code ret;
  91         struct gensec_krb5_state *gensec_krb5_state;
  92         struct cli_credentials *creds;
  93         const struct socket_address *my_addr, *peer_addr;
  94         krb5_address my_krb5_addr, peer_krb5_addr;
  95
  96         creds = gensec_get_credentials(gensec_security);
  97         if (!creds) {
  98                 return NT_STATUS_INVALID_PARAMETER;
  99         }
 100
 101         gensec_krb5_state = talloc(gensec_security, struct gensec_krb5_state);
 102         if (!gensec_krb5_state) {
 103                 return NT_STATUS_NO_MEMORY;
 104         }
 105
 106         gensec_security->private_data = gensec_krb5_state;
 107         gensec_krb5_state->smb_krb5_context = NULL;
 108         gensec_krb5_state->auth_context = NULL;
 109         gensec_krb5_state->ticket = NULL;
 110         ZERO_STRUCT(gensec_krb5_state->enc_ticket);
 111         gensec_krb5_state->keyblock = NULL;
 112         gensec_krb5_state->session_key = data_blob(NULL, 0);
 113         gensec_krb5_state->pac = data_blob(NULL, 0);
 114         gensec_krb5_state->gssapi = False;
 115
 116         talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
 117
 118         if (cli_credentials_get_krb5_context(creds, &gensec_krb5_state->smb_krb5_context)) {
 119                 talloc_free(gensec_krb5_state);
 120                 return NT_STATUS_INTERNAL_ERROR;
 121         }
 122
 123         ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
 124         if (ret) {
 125                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
 126                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 127                                                     ret, gensec_krb5_state)));
 128                 talloc_free(gensec_krb5_state);
 129                 return NT_STATUS_INTERNAL_ERROR;
 130         }
 131
 132         ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
 133                                      gensec_krb5_state->auth_context,
 134                                      KRB5_AUTH_CONTEXT_DO_SEQUENCE);
 135         if (ret) {
 136                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
 137                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 138                                                     ret, gensec_krb5_state)));
 139                 talloc_free(gensec_krb5_state);
 140                 return NT_STATUS_INTERNAL_ERROR;
 141         }
 142
 143         my_addr = gensec_get_my_addr(gensec_security);
 144         if (my_addr && my_addr->sockaddr) {
 145                 ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
 146                                             my_addr->sockaddr, &my_krb5_addr);
 147                 if (ret) {
 148                         DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
 149                                  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 150                                                             ret, gensec_krb5_state)));
 151                         talloc_free(gensec_krb5_state);
 152                         return NT_STATUS_INTERNAL_ERROR;
 153                 }
 154         }
 155
 156         peer_addr = gensec_get_my_addr(gensec_security);
 157         if (peer_addr && peer_addr->sockaddr) {
 158                 ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
 159                                             peer_addr->sockaddr, &peer_krb5_addr);
 160                 if (ret) {
 161                         DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
 162                                  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 163                                                             ret, gensec_krb5_state)));
 164                         talloc_free(gensec_krb5_state);
 165                         return NT_STATUS_INTERNAL_ERROR;
 166                 }
 167         }
 168
 169         ret = krb5_auth_con_setaddrs(gensec_krb5_state->smb_krb5_context->krb5_context,
 170                                      gensec_krb5_state->auth_context,
 171                                      my_addr ? &my_krb5_addr : NULL,
 172                                      peer_addr ? &peer_krb5_addr : NULL);
 173         if (ret) {
 174                 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
 175                          smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 176                                                     ret, gensec_krb5_state)));
 177                 talloc_free(gensec_krb5_state);
 178                 return NT_STATUS_INTERNAL_ERROR;
 179         }
 180
 181         return NT_STATUS_OK;
 182 }
 183
 184 static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
 185 {
 186         NTSTATUS nt_status;
 187         struct gensec_krb5_state *gensec_krb5_state;
 188
 189         nt_status = gensec_krb5_start(gensec_security);
 190         if (!NT_STATUS_IS_OK(nt_status)) {
 191                 return nt_status;
 192         }
 193
 194         gensec_krb5_state = gensec_security->private_data;
 195         gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
 196
 197         return NT_STATUS_OK;
 198 }
 199
 200 static NTSTATUS gensec_fake_gssapi_krb5_server_start(struct gensec_security *gensec_security)
 201 {
 202         NTSTATUS nt_status = gensec_krb5_server_start(gensec_security);
 203
 204         if (NT_STATUS_IS_OK(nt_status)) {
 205                 struct gensec_krb5_state *gensec_krb5_state;
 206                 gensec_krb5_state = gensec_security->private_data;
 207                 gensec_krb5_state->gssapi = True;
 208         }
 209         return nt_status;
 210 }
 211
 212 static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security)
 213 {
 214         struct gensec_krb5_state *gensec_krb5_state;
 215         krb5_error_code ret;
 216         NTSTATUS nt_status;
 217         struct ccache_container *ccache_container;
 218         const char *hostname;
 219         krb5_flags ap_req_options = AP_OPTS_USE_SUBKEY | AP_OPTS_MUTUAL_REQUIRED;
 220
 221         const char *principal;
 222         krb5_data in_data;
 223
 224         hostname = gensec_get_target_hostname(gensec_security);
 225         if (!hostname) {
 226                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 227                 return NT_STATUS_INVALID_PARAMETER;
 228         }
 229         if (is_ipaddress(hostname)) {
 230                 DEBUG(2, ("Cannot do krb5 to an IP address"));
 231                 return NT_STATUS_INVALID_PARAMETER;
 232         }
 233         if (strequal(hostname, "localhost")) {
 234                 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
 235                 return NT_STATUS_INVALID_PARAMETER;
 236         }
 237
 238         nt_status = gensec_krb5_start(gensec_security);
 239         if (!NT_STATUS_IS_OK(nt_status)) {
 240                 return nt_status;
 241         }
 242
 243         gensec_krb5_state = gensec_security->private_data;
 244         gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
 245
 246         ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security), &ccache_container);
 247         if (ret) {
 248                 DEBUG(1,("gensec_krb5_start: cli_credentials_get_ccache failed: %s\n",
 249                          error_message(ret)));
 250                 return NT_STATUS_UNSUCCESSFUL;
 251         }
 252
 253         in_data.length = 0;
 254
 255         principal = gensec_get_target_principal(gensec_security);
 256         if (principal && lp_client_use_spnego_principal()) {
 257                 krb5_principal target_principal;
 258                 ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
 259                                       &target_principal);
 260                 if (ret == 0) {
 261                         ret = krb5_mk_req_exact(gensec_krb5_state->smb_krb5_context->krb5_context,
 262                                                 &gensec_krb5_state->auth_context,
 263                                                 ap_req_options,
 264                                                 target_principal,
 265                                                 &in_data, ccache_container->ccache,
 266                                                 &gensec_krb5_state->enc_ticket);
 267                         krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
 268                                             target_principal);
 269                 }
 270         } else {
 271                 ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
 272                                   &gensec_krb5_state->auth_context,
 273                                   ap_req_options,
 274                                   gensec_get_target_service(gensec_security),
 275                                   hostname,
 276                                   &in_data, ccache_container->ccache,
 277                                   &gensec_krb5_state->enc_ticket);
 278         }
 279         switch (ret) {
 280         case 0:
 281                 return NT_STATUS_OK;
 282         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 283                 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
 284                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 285                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 286         case KRB5_KDC_UNREACH:
 287                 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
 288                           hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 289                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 290         case KRB5KDC_ERR_PREAUTH_FAILED:
 291         case KRB5KRB_AP_ERR_TKT_EXPIRED:
 292         case KRB5_CC_END:
 293                 /* Too much clock skew - we will need to kinit to re-skew the clock */
 294         case KRB5KRB_AP_ERR_SKEW:
 295         case KRB5_KDCREP_SKEW:
 296         {
 297                 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
 298                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 299                 /* fall down to remaining code */
 300         }
 301
 302
 303         /* just don't print a message for these really ordinary messages */
 304         case KRB5_FCC_NOFILE:
 305         case KRB5_CC_NOTFOUND:
 306         case ENOENT:
 307
 308                 return NT_STATUS_UNSUCCESSFUL;
 309                 break;
 310
 311         default:
 312                 DEBUG(0, ("kerberos: %s\n",
 313                           smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
 314                 return NT_STATUS_UNSUCCESSFUL;
 315         }
 316 }
 317
 318 static NTSTATUS gensec_fake_gssapi_krb5_client_start(struct gensec_security *gensec_security)
 319 {
 320         NTSTATUS nt_status = gensec_krb5_client_start(gensec_security);
 321
 322         if (NT_STATUS_IS_OK(nt_status)) {
 323                 struct gensec_krb5_state *gensec_krb5_state;
 324                 gensec_krb5_state = gensec_security->private_data;
 325                 gensec_krb5_state->gssapi = True;
 326         }
 327         return nt_status;
 328 }
 329
 330 /**
 331  * Check if the packet is one for this mechansim
 332  *
 333  * @param gensec_security GENSEC state
 334  * @param in The request, as a DATA_BLOB
 335  * @return Error, INVALID_PARAMETER if it's not a packet for us
 336  *                or NT_STATUS_OK if the packet is ok.
 337  */
 338
 339 static NTSTATUS gensec_fake_gssapi_krb5_magic(struct gensec_security *gensec_security,
 340                                   const DATA_BLOB *in)
 341 {
 342         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 343                 return NT_STATUS_OK;
 344         } else {
 345                 return NT_STATUS_INVALID_PARAMETER;
 346         }
 347 }
 348
 349
 350 /**
 351  * Next state function for the Krb5 GENSEC mechanism
 352  *
 353  * @param gensec_krb5_state KRB5 State
 354  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 355  * @param in The request, as a DATA_BLOB
 356  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 357  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 358  *                or NT_STATUS_OK if the user is authenticated.
 359  */
 360
 361 static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
 362                                    TALLOC_CTX *out_mem_ctx,
 363                                    const DATA_BLOB in, DATA_BLOB *out)
 364 {
 365         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 366         krb5_error_code ret = 0;
 367         NTSTATUS nt_status;
 368
 369         switch (gensec_krb5_state->state_position) {
 370         case GENSEC_KRB5_CLIENT_START:
 371         {
 372                 DATA_BLOB unwrapped_out;
 373
 374                 if (gensec_krb5_state->gssapi) {
 375                         unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 376
 377                         /* wrap that up in a nice GSS-API wrapping */
 378                         *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
 379                 } else {
 380                         *out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
 381                 }
 382                 gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
 383                 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 384                 return nt_status;
 385         }
 386
 387         case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
 388         {
 389                 DATA_BLOB unwrapped_in;
 390                 krb5_data inbuf;
 391                 krb5_ap_rep_enc_part *repl = NULL;
 392                 uint8_t tok_id[2];
 393
 394                 if (gensec_krb5_state->gssapi) {
 395                         if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 396                                 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
 397                                 dump_data_pw("Mutual authentication message:\n", in.data, in.length);
 398                                 return NT_STATUS_INVALID_PARAMETER;
 399                         }
 400                 } else {
 401                         unwrapped_in = in;
 402                 }
 403                 /* TODO: check the tok_id */
 404
 405                 inbuf.data = unwrapped_in.data;
 406                 inbuf.length = unwrapped_in.length;
 407                 ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context,
 408                                   gensec_krb5_state->auth_context,
 409                                   &inbuf, &repl);
 410                 if (ret) {
 411                         DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
 412                                  smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
 413                         dump_data_pw("Mutual authentication message:\n", inbuf.data, inbuf.length);
 414                         nt_status = NT_STATUS_ACCESS_DENIED;
 415                 } else {
 416                         *out = data_blob(NULL, 0);
 417                         nt_status = NT_STATUS_OK;
 418                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 419                 }
 420                 if (repl) {
 421                         krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
 422                 }
 423                 return nt_status;
 424         }
 425
 426         case GENSEC_KRB5_SERVER_START:
 427         {
 428                 DATA_BLOB unwrapped_in;
 429                 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
 430                 uint8_t tok_id[2];
 431
 432                 if (!in.data) {
 433                         return NT_STATUS_INVALID_PARAMETER;
 434                 }
 435
 436                 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
 437                 if (gensec_krb5_state->gssapi
 438                     && gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
 439                         nt_status = ads_verify_ticket(out_mem_ctx,
 440                                                       gensec_krb5_state->smb_krb5_context,
 441                                                       &gensec_krb5_state->auth_context,
 442                                                       gensec_get_credentials(gensec_security),
 443                                                       gensec_get_target_service(gensec_security), &unwrapped_in,
 444                                                       &gensec_krb5_state->ticket, &unwrapped_out,
 445                                                       &gensec_krb5_state->keyblock);
 446                 } else {
 447                         /* TODO: check the tok_id */
 448                         nt_status = ads_verify_ticket(out_mem_ctx,
 449                                                       gensec_krb5_state->smb_krb5_context,
 450                                                       &gensec_krb5_state->auth_context,
 451                                                       gensec_get_credentials(gensec_security),
 452                                                       gensec_get_target_service(gensec_security),
 453                                                       &in,
 454                                                       &gensec_krb5_state->ticket, &unwrapped_out,
 455                                                       &gensec_krb5_state->keyblock);
 456                 }
 457
 458                 if (!NT_STATUS_IS_OK(nt_status)) {
 459                         return nt_status;
 460                 }
 461
 462                 if (NT_STATUS_IS_OK(nt_status)) {
 463                         gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
 464                         /* wrap that up in a nice GSS-API wrapping */
 465                         if (gensec_krb5_state->gssapi) {
 466                                 *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
 467                         } else {
 468                                 *out = unwrapped_out;
 469                         }
 470                 }
 471                 return nt_status;
 472         }
 473
 474         case GENSEC_KRB5_DONE:
 475         default:
 476                 /* Asking too many times... */
 477                 return NT_STATUS_INVALID_PARAMETER;
 478         }
 479 }
 480
 481 static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
 482                                         DATA_BLOB *session_key)
 483 {
 484         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 485         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 486         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 487         krb5_keyblock *skey;
 488         krb5_error_code err = -1;
 489
 490         if (gensec_krb5_state->session_key.data) {
 491                 *session_key = gensec_krb5_state->session_key;
 492                 return NT_STATUS_OK;
 493         }
 494
 495         switch (gensec_security->gensec_role) {
 496         case GENSEC_CLIENT:
 497                 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
 498                 break;
 499         case GENSEC_SERVER:
 500                 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
 501                 break;
 502         }
 503         if (err == 0 && skey != NULL) {
 504                 DEBUG(10, ("Got KRB5 session key of length %d\n",
 505                            (int)KRB5_KEY_LENGTH(skey)));
 506                 gensec_krb5_state->session_key = data_blob_talloc(gensec_krb5_state,
 507                                                 KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
 508                 *session_key = gensec_krb5_state->session_key;
 509                 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
 510
 511                 krb5_free_keyblock(context, skey);
 512                 return NT_STATUS_OK;
 513         } else {
 514                 DEBUG(10, ("KRB5 error getting session key %d\n", err));
 515                 return NT_STATUS_NO_USER_SESSION_KEY;
 516         }
 517 }
 518
 519 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
 520                                          struct auth_session_info **_session_info)
 521 {
 522         NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
 523         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 524         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 525         struct auth_serversupplied_info *server_info = NULL;
 526         struct auth_session_info *session_info = NULL;
 527         struct PAC_LOGON_INFO *logon_info;
 528
 529         krb5_principal client_principal;
 530
 531         DATA_BLOB pac;
 532         krb5_data pac_data;
 533
 534         krb5_error_code ret;
 535
 536         TALLOC_CTX *mem_ctx = talloc_new(gensec_security);
 537         if (!mem_ctx) {
 538                 return NT_STATUS_NO_MEMORY;
 539         }
 540
 541         ret = krb5_ticket_get_authorization_data_type(context, gensec_krb5_state->ticket,
 542                                                       KRB5_AUTHDATA_WIN2K_PAC,
 543                                                       &pac_data);
 544
 545         if (ret) {
 546                 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
 547                           smb_get_krb5_error_message(context,
 548                                                      ret, mem_ctx)));
 549         } else {
 550                 pac = data_blob_talloc(mem_ctx, pac_data.data, pac_data.length);
 551                 if (!pac.data) {
 552                         talloc_free(mem_ctx);
 553                         return NT_STATUS_NO_MEMORY;
 554                 }
 555
 556                 ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
 557                 if (ret) {
 558                         DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
 559                                   smb_get_krb5_error_message(context,
 560                                                              ret, mem_ctx)));
 561                         talloc_free(mem_ctx);
 562                         return NT_STATUS_NO_MEMORY;
 563                 }
 564
 565                 /* decode and verify the pac */
 566                 nt_status = kerberos_pac_logon_info(gensec_krb5_state, &logon_info, pac,
 567                                                     gensec_krb5_state->smb_krb5_context->krb5_context,
 568                                                     NULL, gensec_krb5_state->keyblock,
 569                                                     client_principal,
 570                                                     gensec_krb5_state->ticket->ticket.authtime, NULL);
 571                 krb5_free_principal(context, client_principal);
 572
 573                 if (NT_STATUS_IS_OK(nt_status)) {
 574                         union netr_Validation validation;
 575                         validation.sam3 = &logon_info->info3;
 576                         nt_status = make_server_info_netlogon_validation(mem_ctx,
 577                                                                          NULL,
 578                                                                          3, &validation,
 579                                                                          &server_info);
 580                 }
 581         }
 582
 583
 584
 585         /* IF we have the PAC - otherwise we need to get this
 586          * data from elsewere - local ldb, or (TODO) lookup of some
 587          * kind...
 588          */
 589         if (!NT_STATUS_IS_OK(nt_status)) {
 590                 /* NO pac, or can't parse or verify it */
 591                 char *principal_string;
 592                 ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
 593                 if (ret) {
 594                         DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
 595                                   smb_get_krb5_error_message(context,
 596                                                              ret, mem_ctx)));
 597                         talloc_free(mem_ctx);
 598                         return NT_STATUS_NO_MEMORY;
 599                 }
 600
 601                 ret = krb5_unparse_name(gensec_krb5_state->smb_krb5_context->krb5_context,
 602                                         client_principal, &principal_string);
 603                 krb5_free_principal(context, client_principal);
 604                 if (ret) {
 605                         talloc_free(mem_ctx);
 606                         return NT_STATUS_NO_MEMORY;
 607                 }
 608
 609                 nt_status = sam_get_server_info_principal(mem_ctx, principal_string,
 610                                                           &server_info);
 611                 free(principal_string);
 612
 613                 if (!NT_STATUS_IS_OK(nt_status)) {
 614                         talloc_free(mem_ctx);
 615                         return nt_status;
 616                 }
 617         }
 618
 619         /* references the server_info into the session_info */
 620         nt_status = auth_generate_session_info(mem_ctx, server_info, &session_info);
 621
 622         if (!NT_STATUS_IS_OK(nt_status)) {
 623                 talloc_free(mem_ctx);
 624                 return nt_status;
 625         }
 626
 627         nt_status = gensec_krb5_session_key(gensec_security, &session_info->session_key);
 628
 629         if (!NT_STATUS_IS_OK(nt_status)) {
 630                 talloc_free(mem_ctx);
 631                 return nt_status;
 632         }
 633
 634         *_session_info = session_info;
 635
 636         talloc_steal(gensec_krb5_state, session_info);
 637         talloc_free(mem_ctx);
 638         return NT_STATUS_OK;
 639 }
 640
 641 static NTSTATUS gensec_krb5_wrap(struct gensec_security *gensec_security,
 642                                    TALLOC_CTX *mem_ctx,
 643                                    const DATA_BLOB *in,
 644                                    DATA_BLOB *out)
 645 {
 646         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 647         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 648         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 649         krb5_error_code ret;
 650         krb5_data input, output;
 651         input.length = in->length;
 652         input.data = in->data;
 653
 654         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 655                 ret = krb5_mk_priv(context, auth_context, &input, &output, NULL);
 656                 if (ret) {
 657                         DEBUG(1, ("krb5_mk_priv failed: %s\n",
 658                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 659                                                              ret, mem_ctx)));
 660                         return NT_STATUS_ACCESS_DENIED;
 661                 }
 662                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
 663
 664                 krb5_data_free(&output);
 665         } else {
 666                 return NT_STATUS_ACCESS_DENIED;
 667         }
 668         return NT_STATUS_OK;
 669 }
 670
 671 static NTSTATUS gensec_krb5_unwrap(struct gensec_security *gensec_security,
 672                                      TALLOC_CTX *mem_ctx,
 673                                      const DATA_BLOB *in,
 674                                      DATA_BLOB *out)
 675 {
 676         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 677         krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
 678         krb5_auth_context auth_context = gensec_krb5_state->auth_context;
 679         krb5_error_code ret;
 680         krb5_data input, output;
 681         krb5_replay_data replay;
 682         input.length = in->length;
 683         input.data = in->data;
 684
 685         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 686                 ret = krb5_rd_priv(context, auth_context, &input, &output, &replay);
 687                 if (ret) {
 688                         DEBUG(1, ("krb5_rd_priv failed: %s\n",
 689                                   smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
 690                                                              ret, mem_ctx)));
 691                         return NT_STATUS_ACCESS_DENIED;
 692                 }
 693                 *out = data_blob_talloc(mem_ctx, output.data, output.length);
 694
 695                 krb5_data_free(&output);
 696         } else {
 697                 return NT_STATUS_ACCESS_DENIED;
 698         }
 699         return NT_STATUS_OK;
 700 }
 701
 702 static BOOL gensec_krb5_have_feature(struct gensec_security *gensec_security,
 703                                      uint32_t feature)
 704 {
 705         struct gensec_krb5_state *gensec_krb5_state = gensec_security->private_data;
 706         if (feature & GENSEC_FEATURE_SESSION_KEY) {
 707                 return True;
 708         }
 709         if (!gensec_krb5_state->gssapi &&
 710             (feature & GENSEC_FEATURE_SEAL)) {
 711                 return True;
 712         }
 713
 714         return False;
 715 }
 716
 717 static const char *gensec_krb5_oids[] = {
 718         GENSEC_OID_KERBEROS5,
 719         GENSEC_OID_KERBEROS5_OLD,
 720         NULL
 721 };
 722
 723 static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops = {
 724         .name           = "fake_gssapi_krb5",
 725         .sasl_name      = "GSSAPI",
 726         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
 727         .oid            = gensec_krb5_oids,
 728         .client_start   = gensec_fake_gssapi_krb5_client_start,
 729         .server_start   = gensec_fake_gssapi_krb5_server_start,
 730         .update         = gensec_krb5_update,
 731         .magic          = gensec_fake_gssapi_krb5_magic,
 732         .session_key    = gensec_krb5_session_key,
 733         .session_info   = gensec_krb5_session_info,
 734         .have_feature   = gensec_krb5_have_feature,
 735         .enabled        = False,
 736         .kerberos       = True
 737 };
 738
 739 static const struct gensec_security_ops gensec_krb5_security_ops = {
 740         .name           = "krb5",
 741         .client_start   = gensec_krb5_client_start,
 742         .server_start   = gensec_krb5_server_start,
 743         .update         = gensec_krb5_update,
 744         .session_key    = gensec_krb5_session_key,
 745         .session_info   = gensec_krb5_session_info,
 746         .have_feature   = gensec_krb5_have_feature,
 747         .wrap           = gensec_krb5_wrap,
 748         .unwrap         = gensec_krb5_unwrap,
 749         .enabled        = True,
 750         .kerberos       = True
 751 };
 752
 753 NTSTATUS gensec_krb5_init(void)
 754 {
 755         NTSTATUS ret;
 756
 757         auth_init();
 758
 759         ret = gensec_register(&gensec_krb5_security_ops);
 760         if (!NT_STATUS_IS_OK(ret)) {
 761                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 762                         gensec_krb5_security_ops.name));
 763                 return ret;
 764         }
 765
 766         ret = gensec_register(&gensec_fake_gssapi_krb5_security_ops);
 767         if (!NT_STATUS_IS_OK(ret)) {
 768                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 769                         gensec_krb5_security_ops.name));
 770                 return ret;
 771         }
 772
 773         return ret;
 774 }