source4/auth/gensec/gensec_gssapi.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Kerberos backend for GENSEC
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   7    Copyright (C) Stefan Metzmacher <metze@samba.org> 2004-2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "system/kerberos.h"
  27 #include "heimdal/lib/gssapi/gssapi/gssapi.h"
  28 #include "auth/kerberos/kerberos.h"
  29 #include "librpc/gen_ndr/krb5pac.h"
  30 #include "auth/auth.h"
  31 #include "lib/ldb/include/ldb.h"
  32 #include "auth/auth_sam.h"
  33 #include "librpc/rpc/dcerpc.h"
  34 #include "auth/credentials/credentials.h"
  35 #include "auth/credentials/credentials_krb5.h"
  36 #include "auth/gensec/gensec.h"
  37
  38 enum gensec_gssapi_sasl_state
  39 {
  40         STAGE_GSS_NEG,
  41         STAGE_SASL_SSF_NEG,
  42         STAGE_SASL_SSF_ACCEPT,
  43         STAGE_DONE
  44 };
  45
  46 #define NEG_SEAL 0x4
  47 #define NEG_SIGN 0x2
  48 #define NEG_NONE 0x1
  49
  50 struct gensec_gssapi_state {
  51         gss_ctx_id_t gssapi_context;
  52         struct gss_channel_bindings_struct *input_chan_bindings;
  53         gss_name_t server_name;
  54         gss_name_t client_name;
  55         OM_uint32 want_flags, got_flags;
  56         const gss_OID_desc *gss_oid;
  57
  58         DATA_BLOB session_key;
  59         DATA_BLOB pac;
  60
  61         struct smb_krb5_context *smb_krb5_context;
  62         struct gssapi_creds_container *client_cred;
  63         struct gssapi_creds_container *server_cred;
  64
  65         gss_cred_id_t delegated_cred_handle;
  66
  67         BOOL sasl; /* We have two different mechs in this file: One
  68                     * for SASL wrapped GSSAPI and another for normal
  69                     * GSSAPI */
  70         enum gensec_gssapi_sasl_state sasl_state;
  71         uint8_t sasl_protection; /* What was negotiated at the SASL
  72                                   * layer, independent of the GSSAPI
  73                                   * layer... */
  74
  75         size_t max_wrap_buf_size;
  76         int gss_exchange_count;
  77 };
  78
  79 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
  80 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
  81
  82 static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
  83                                  OM_uint32 maj_stat, OM_uint32 min_stat,
  84                                  const gss_OID_desc *mech)
  85 {
  86         OM_uint32 disp_min_stat, disp_maj_stat;
  87         gss_buffer_desc maj_error_message;
  88         gss_buffer_desc min_error_message;
  89         OM_uint32 msg_ctx = 0;
  90
  91         char *ret;
  92
  93         maj_error_message.value = NULL;
  94         min_error_message.value = NULL;
  95
  96         disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
  97                            mech, &msg_ctx, &maj_error_message);
  98         disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
  99                            mech, &msg_ctx, &min_error_message);
 100         ret = talloc_asprintf(mem_ctx, "%s: %s", (char *)maj_error_message.value, (char *)min_error_message.value);
 101
 102         gss_release_buffer(&disp_min_stat, &maj_error_message);
 103         gss_release_buffer(&disp_min_stat, &min_error_message);
 104
 105         return ret;
 106 }
 107
 108
 109 static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
 110 {
 111         OM_uint32 maj_stat, min_stat;
 112
 113         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
 114                 maj_stat = gss_release_cred(&min_stat,
 115                                             &gensec_gssapi_state->delegated_cred_handle);
 116         }
 117
 118         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
 119                 maj_stat = gss_delete_sec_context (&min_stat,
 120                                                    &gensec_gssapi_state->gssapi_context,
 121                                                    GSS_C_NO_BUFFER);
 122         }
 123
 124         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
 125                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
 126         }
 127         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
 128                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
 129         }
 130         return 0;
 131 }
 132
 133 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 134 {
 135         struct gensec_gssapi_state *gensec_gssapi_state;
 136         krb5_error_code ret;
 137         struct gsskrb5_send_to_kdc send_to_kdc;
 138
 139         gensec_gssapi_state = talloc(gensec_security, struct gensec_gssapi_state);
 140         if (!gensec_gssapi_state) {
 141                 return NT_STATUS_NO_MEMORY;
 142         }
 143
 144         gensec_gssapi_state->gss_exchange_count = 0;
 145         gensec_gssapi_state->max_wrap_buf_size
 146                 = lp_parm_int(-1, "gensec_gssapi", "max wrap buf size", 65536);
 147
 148         gensec_gssapi_state->sasl = False;
 149         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 150
 151         gensec_security->private_data = gensec_gssapi_state;
 152
 153         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 154         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 155         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 156
 157         /* TODO: Fill in channel bindings */
 158         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 159
 160         gensec_gssapi_state->want_flags = 0;
 161         if (lp_parm_bool(-1, "gensec_gssapi", "mutual", True)) {
 162                 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
 163         }
 164         if (lp_parm_bool(-1, "gensec_gssapi", "delegation", True)) {
 165                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
 166         }
 167         if (lp_parm_bool(-1, "gensec_gssapi", "replay", True)) {
 168                 gensec_gssapi_state->want_flags |= GSS_C_REPLAY_FLAG;
 169         }
 170         if (lp_parm_bool(-1, "gensec_gssapi", "sequence", True)) {
 171                 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
 172         }
 173
 174         gensec_gssapi_state->got_flags = 0;
 175
 176         gensec_gssapi_state->session_key = data_blob(NULL, 0);
 177         gensec_gssapi_state->pac = data_blob(NULL, 0);
 178
 179         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 180
 181         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
 182
 183         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 184                 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
 185         }
 186         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 187                 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
 188         }
 189         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 190                 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
 191         }
 192
 193         gensec_gssapi_state->gss_oid = GSS_C_NULL_OID;
 194
 195         send_to_kdc.func = smb_krb5_send_and_recv_func;
 196         send_to_kdc.ptr = gensec_security->event_ctx;
 197
 198         ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
 199         if (ret) {
 200                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
 201                 talloc_free(gensec_gssapi_state);
 202                 return NT_STATUS_INTERNAL_ERROR;
 203         }
 204         if (lp_realm() && *lp_realm()) {
 205                 char *upper_realm = strupper_talloc(gensec_gssapi_state, lp_realm());
 206                 if (!upper_realm) {
 207                         DEBUG(1,("gensec_krb5_start: could not uppercase realm: %s\n", lp_realm()));
 208                         talloc_free(gensec_gssapi_state);
 209                         return NT_STATUS_NO_MEMORY;
 210                 }
 211                 ret = gsskrb5_set_default_realm(upper_realm);
 212                 talloc_free(upper_realm);
 213                 if (ret) {
 214                         DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
 215                         talloc_free(gensec_gssapi_state);
 216                         return NT_STATUS_INTERNAL_ERROR;
 217                 }
 218         }
 219
 220         /* don't do DNS lookups of any kind, it might/will fail for a netbios name */
 221         ret = gsskrb5_set_dns_canonicalize(FALSE);
 222         if (ret) {
 223                 DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
 224                 talloc_free(gensec_gssapi_state);
 225                 return NT_STATUS_INTERNAL_ERROR;
 226         }
 227
 228         ret = smb_krb5_init_context(gensec_gssapi_state,
 229                                     &gensec_gssapi_state->smb_krb5_context);
 230         if (ret) {
 231                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
 232                          error_message(ret)));
 233                 talloc_free(gensec_gssapi_state);
 234                 return NT_STATUS_INTERNAL_ERROR;
 235         }
 236         return NT_STATUS_OK;
 237 }
 238
 239 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 240 {
 241         NTSTATUS nt_status;
 242         int ret;
 243         struct gensec_gssapi_state *gensec_gssapi_state;
 244         struct cli_credentials *machine_account;
 245         struct gssapi_creds_container *gcc;
 246
 247         nt_status = gensec_gssapi_start(gensec_security);
 248         if (!NT_STATUS_IS_OK(nt_status)) {
 249                 return nt_status;
 250         }
 251
 252         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 253
 254         machine_account = gensec_get_credentials(gensec_security);
 255
 256         if (!machine_account) {
 257                 DEBUG(3, ("No machine account credentials specified\n"));
 258                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 259         } else {
 260                 ret = cli_credentials_get_server_gss_creds(machine_account, &gcc);
 261                 if (ret) {
 262                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 263                                   error_message(ret)));
 264                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 265                 }
 266         }
 267
 268         gensec_gssapi_state->server_cred = gcc;
 269         return NT_STATUS_OK;
 270
 271 }
 272
 273 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 274 {
 275         NTSTATUS nt_status;
 276         struct gensec_gssapi_state *gensec_gssapi_state;
 277         nt_status = gensec_gssapi_server_start(gensec_security);
 278
 279         if (NT_STATUS_IS_OK(nt_status)) {
 280                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 281                 gensec_gssapi_state->sasl = True;
 282         }
 283         return nt_status;
 284 }
 285
 286 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 287 {
 288         struct gensec_gssapi_state *gensec_gssapi_state;
 289         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 290         krb5_error_code ret;
 291         NTSTATUS nt_status;
 292         gss_buffer_desc name_token;
 293         gss_OID name_type;
 294         OM_uint32 maj_stat, min_stat;
 295         const char *hostname = gensec_get_target_hostname(gensec_security);
 296         const char *principal;
 297         struct gssapi_creds_container *gcc;
 298
 299         if (!hostname) {
 300                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 301                 return NT_STATUS_INVALID_PARAMETER;
 302         }
 303         if (is_ipaddress(hostname)) {
 304                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 305                 return NT_STATUS_INVALID_PARAMETER;
 306         }
 307         if (strcmp(hostname, "localhost") == 0) {
 308                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 309                 return NT_STATUS_INVALID_PARAMETER;
 310         }
 311
 312         nt_status = gensec_gssapi_start(gensec_security);
 313         if (!NT_STATUS_IS_OK(nt_status)) {
 314                 return nt_status;
 315         }
 316
 317         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 318
 319         gensec_gssapi_state->gss_oid = gss_mech_krb5;
 320
 321         principal = gensec_get_target_principal(gensec_security);
 322         if (principal && lp_client_use_spnego_principal()) {
 323                 name_type = GSS_C_NULL_OID;
 324         } else {
 325                 principal = talloc_asprintf(gensec_gssapi_state, "%s@%s",
 326                                             gensec_get_target_service(gensec_security),
 327                                             hostname);
 328
 329                 name_type = GSS_C_NT_HOSTBASED_SERVICE;
 330         }
 331         name_token.value  = discard_const_p(uint8_t, principal);
 332         name_token.length = strlen(principal);
 333
 334
 335         maj_stat = gss_import_name (&min_stat,
 336                                     &name_token,
 337                                     name_type,
 338                                     &gensec_gssapi_state->server_name);
 339         if (maj_stat) {
 340                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 341                           (char *)name_token.value,
 342                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 343                 return NT_STATUS_INVALID_PARAMETER;
 344         }
 345
 346         ret = cli_credentials_get_client_gss_creds(creds, &gcc);
 347         switch (ret) {
 348         case 0:
 349                 break;
 350         case KRB5_KDC_UNREACH:
 351                 DEBUG(3, ("Cannot reach a KDC we require to contact %s\n", principal));
 352                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 353         default:
 354                 DEBUG(1, ("Aquiring initiator credentails failed\n"));
 355                 return NT_STATUS_UNSUCCESSFUL;
 356         }
 357
 358         gensec_gssapi_state->client_cred = gcc;
 359
 360         return NT_STATUS_OK;
 361 }
 362
 363 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 364 {
 365         NTSTATUS nt_status;
 366         struct gensec_gssapi_state *gensec_gssapi_state;
 367         nt_status = gensec_gssapi_client_start(gensec_security);
 368
 369         if (NT_STATUS_IS_OK(nt_status)) {
 370                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 371                 gensec_gssapi_state->sasl = True;
 372         }
 373         return nt_status;
 374 }
 375
 376
 377 /**
 378  * Check if the packet is one for this mechansim
 379  *
 380  * @param gensec_security GENSEC state
 381  * @param in The request, as a DATA_BLOB
 382  * @return Error, INVALID_PARAMETER if it's not a packet for us
 383  *                or NT_STATUS_OK if the packet is ok.
 384  */
 385
 386 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 387                                     const DATA_BLOB *in)
 388 {
 389         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 390                 return NT_STATUS_OK;
 391         } else {
 392                 return NT_STATUS_INVALID_PARAMETER;
 393         }
 394 }
 395
 396
 397 /**
 398  * Next state function for the GSSAPI GENSEC mechanism
 399  *
 400  * @param gensec_gssapi_state GSSAPI State
 401  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 402  * @param in The request, as a DATA_BLOB
 403  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 404  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 405  *                or NT_STATUS_OK if the user is authenticated.
 406  */
 407
 408 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 409                                    TALLOC_CTX *out_mem_ctx,
 410                                    const DATA_BLOB in, DATA_BLOB *out)
 411 {
 412         struct gensec_gssapi_state *gensec_gssapi_state
 413                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 414         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 415         OM_uint32 maj_stat, min_stat;
 416         OM_uint32 min_stat2;
 417         gss_buffer_desc input_token, output_token;
 418         gss_OID gss_oid_p = NULL;
 419         input_token.length = in.length;
 420         input_token.value = in.data;
 421
 422         switch (gensec_gssapi_state->sasl_state) {
 423         case STAGE_GSS_NEG:
 424         {
 425                 switch (gensec_security->gensec_role) {
 426                 case GENSEC_CLIENT:
 427                 {
 428                         maj_stat = gss_init_sec_context(&min_stat,
 429                                                         gensec_gssapi_state->client_cred->creds,
 430                                                         &gensec_gssapi_state->gssapi_context,
 431                                                         gensec_gssapi_state->server_name,
 432                                                         discard_const_p(gss_OID_desc, gensec_gssapi_state->gss_oid),
 433                                                         gensec_gssapi_state->want_flags,
 434                                                         0,
 435                                                         gensec_gssapi_state->input_chan_bindings,
 436                                                         &input_token,
 437                                                         &gss_oid_p,
 438                                                         &output_token,
 439                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 440                                                         NULL);
 441                         if (gss_oid_p) {
 442                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 443                         }
 444                         break;
 445                 }
 446                 case GENSEC_SERVER:
 447                 {
 448                         maj_stat = gss_accept_sec_context(&min_stat,
 449                                                           &gensec_gssapi_state->gssapi_context,
 450                                                           gensec_gssapi_state->server_cred->creds,
 451                                                           &input_token,
 452                                                           gensec_gssapi_state->input_chan_bindings,
 453                                                           &gensec_gssapi_state->client_name,
 454                                                           &gss_oid_p,
 455                                                           &output_token,
 456                                                           &gensec_gssapi_state->got_flags,
 457                                                           NULL,
 458                                                           &gensec_gssapi_state->delegated_cred_handle);
 459                         if (gss_oid_p) {
 460                                 gensec_gssapi_state->gss_oid = gss_oid_p;
 461                         }
 462                         break;
 463                 }
 464                 default:
 465                         return NT_STATUS_INVALID_PARAMETER;
 466
 467                 }
 468
 469                 gensec_gssapi_state->gss_exchange_count++;
 470
 471                 if (maj_stat == GSS_S_COMPLETE) {
 472                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 473                         gss_release_buffer(&min_stat2, &output_token);
 474
 475                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 476                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 477                         } else {
 478                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 479                         }
 480
 481                         /* We may have been invoked as SASL, so there
 482                          * is more work to do */
 483                         if (gensec_gssapi_state->sasl) {
 484                                 /* Due to a very subtle interaction
 485                                  * with SASL and the LDAP libs, we
 486                                  * must ensure the data pointer is
 487                                  * != NULL, but the length is 0.
 488                                  *
 489                                  * This ensures we send a 'zero
 490                                  * length' (rather than NULL) response
 491                                  */
 492
 493                                 if (!out->data) {
 494                                         out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
 495                                 }
 496
 497                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 498                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 499                         } else {
 500                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 501
 502                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 503                                         DEBUG(5, ("GSSAPI Connection will be cryptographicly sealed\n"));
 504                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 505                                         DEBUG(5, ("GSSAPI Connection will be cryptographicly signed\n"));
 506                                 } else {
 507                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 508                                 }
 509
 510                                 return NT_STATUS_OK;
 511                         }
 512                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 513                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 514                         gss_release_buffer(&min_stat2, &output_token);
 515
 516                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 517                 } else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
 518                         switch (min_stat) {
 519                         case KRB5_KDC_UNREACH:
 520                                 DEBUG(3, ("Cannot reach a KDC we require: %s\n",
 521                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 522                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 523                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 524                                 DEBUG(3, ("Server is not registered with our KDC: %s\n",
 525                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 526                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 527                         case KRB5KRB_AP_ERR_MSG_TYPE:
 528                                 /* garbage input, possibly from the auto-mech detection */
 529                                 return NT_STATUS_INVALID_PARAMETER;
 530                         default:
 531                                 DEBUG(1, ("GSS Update(krb5)(%d) Update failed: %s\n",
 532                                           gensec_gssapi_state->gss_exchange_count,
 533                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 534                                 return nt_status;
 535                         }
 536                 } else {
 537                         DEBUG(1, ("GSS Update(%d) failed: %s\n",
 538                                   gensec_gssapi_state->gss_exchange_count,
 539                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 540                         return nt_status;
 541                 }
 542                 break;
 543         }
 544
 545         /* These last two stages are only done if we were invoked as SASL */
 546         case STAGE_SASL_SSF_NEG:
 547         {
 548                 switch (gensec_security->gensec_role) {
 549                 case GENSEC_CLIENT:
 550                 {
 551                         uint8_t maxlength_proposed[4];
 552                         uint8_t maxlength_accepted[4];
 553                         uint8_t security_supported;
 554                         int conf_state;
 555                         gss_qop_t qop_state;
 556                         input_token.length = in.length;
 557                         input_token.value = in.data;
 558
 559                         /* As a client, we have just send a
 560                          * zero-length blob to the server (after the
 561                          * normal GSSAPI exchange), and it has replied
 562                          * with it's SASL negotiation */
 563
 564                         maj_stat = gss_unwrap(&min_stat,
 565                                               gensec_gssapi_state->gssapi_context,
 566                                               &input_token,
 567                                               &output_token,
 568                                               &conf_state,
 569                                               &qop_state);
 570                         if (GSS_ERROR(maj_stat)) {
 571                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 572                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 573                                 return NT_STATUS_ACCESS_DENIED;
 574                         }
 575
 576                         if (output_token.length < 4) {
 577                                 return NT_STATUS_INVALID_PARAMETER;
 578                         }
 579
 580                         memcpy(maxlength_proposed, output_token.value, 4);
 581                         gss_release_buffer(&min_stat, &output_token);
 582
 583                         /* first byte is the proposed security */
 584                         security_supported = maxlength_proposed[0];
 585                         maxlength_proposed[0] = '\0';
 586
 587                         /* Rest is the proposed max wrap length */
 588                         gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
 589                                                                      gensec_gssapi_state->max_wrap_buf_size);
 590                         gensec_gssapi_state->sasl_protection = 0;
 591                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 592                                 if (security_supported & NEG_SEAL) {
 593                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 594                                 }
 595                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 596                                 if (security_supported & NEG_SIGN) {
 597                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 598                                 }
 599                         } else if (security_supported & NEG_NONE) {
 600                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 601                         } else {
 602                                 DEBUG(1, ("Remote server does not support unprotected connections"));
 603                                 return NT_STATUS_ACCESS_DENIED;
 604                         }
 605
 606                         /* Send back the negotiated max length */
 607
 608                         RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
 609
 610                         maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
 611
 612                         input_token.value = maxlength_accepted;
 613                         input_token.length = sizeof(maxlength_accepted);
 614
 615                         maj_stat = gss_wrap(&min_stat,
 616                                             gensec_gssapi_state->gssapi_context,
 617                                             False,
 618                                             GSS_C_QOP_DEFAULT,
 619                                             &input_token,
 620                                             &conf_state,
 621                                             &output_token);
 622                         if (GSS_ERROR(maj_stat)) {
 623                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 624                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 625                                 return NT_STATUS_ACCESS_DENIED;
 626                         }
 627
 628                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 629                         gss_release_buffer(&min_stat, &output_token);
 630
 631                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 632                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 633
 634                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 635                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
 636                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 637                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
 638                         } else {
 639                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
 640                         }
 641
 642                         return NT_STATUS_OK;
 643                 }
 644                 case GENSEC_SERVER:
 645                 {
 646                         uint8_t maxlength_proposed[4];
 647                         uint8_t security_supported = 0x0;
 648                         int conf_state;
 649
 650                         /* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
 651                         if (in.length != 0) {
 652                                 DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
 653                         }
 654
 655                         /* Give the client some idea what we will support */
 656
 657                         RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
 658                         /* first byte is the proposed security */
 659                         maxlength_proposed[0] = '\0';
 660
 661                         gensec_gssapi_state->sasl_protection = 0;
 662                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 663                                 security_supported |= NEG_SEAL;
 664                         }
 665                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 666                                 security_supported |= NEG_SIGN;
 667                         }
 668                         if (security_supported == 0) {
 669                                 /* If we don't support anything, this must be 0 */
 670                                 RSIVAL(maxlength_proposed, 0, 0x0);
 671                         }
 672
 673                         /* TODO:  We may not wish to support this */
 674                         security_supported |= NEG_NONE;
 675                         maxlength_proposed[0] = security_supported;
 676
 677                         input_token.value = maxlength_proposed;
 678                         input_token.length = sizeof(maxlength_proposed);
 679
 680                         maj_stat = gss_wrap(&min_stat,
 681                                             gensec_gssapi_state->gssapi_context,
 682                                             False,
 683                                             GSS_C_QOP_DEFAULT,
 684                                             &input_token,
 685                                             &conf_state,
 686                                             &output_token);
 687                         if (GSS_ERROR(maj_stat)) {
 688                                 DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
 689                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 690                                 return NT_STATUS_ACCESS_DENIED;
 691                         }
 692
 693                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 694                         gss_release_buffer(&min_stat, &output_token);
 695
 696                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 697                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 698                 }
 699                 default:
 700                         return NT_STATUS_INVALID_PARAMETER;
 701
 702                 }
 703         }
 704         /* This is s server-only stage */
 705         case STAGE_SASL_SSF_ACCEPT:
 706         {
 707                 uint8_t maxlength_accepted[4];
 708                 uint8_t security_accepted;
 709                 int conf_state;
 710                 gss_qop_t qop_state;
 711                 input_token.length = in.length;
 712                 input_token.value = in.data;
 713
 714                 maj_stat = gss_unwrap(&min_stat,
 715                                       gensec_gssapi_state->gssapi_context,
 716                                       &input_token,
 717                                       &output_token,
 718                                       &conf_state,
 719                                       &qop_state);
 720                 if (GSS_ERROR(maj_stat)) {
 721                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 722                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 723                         return NT_STATUS_ACCESS_DENIED;
 724                 }
 725
 726                 if (output_token.length < 4) {
 727                         return NT_STATUS_INVALID_PARAMETER;
 728                 }
 729
 730                 memcpy(maxlength_accepted, output_token.value, 4);
 731                 gss_release_buffer(&min_stat, &output_token);
 732
 733                 /* first byte is the proposed security */
 734                 security_accepted = maxlength_accepted[0];
 735                 maxlength_accepted[0] = '\0';
 736
 737                 /* Rest is the proposed max wrap length */
 738                 gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
 739                                                              gensec_gssapi_state->max_wrap_buf_size);
 740
 741                 gensec_gssapi_state->sasl_protection = 0;
 742                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 743                         if (security_accepted & NEG_SEAL) {
 744                                 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 745                         }
 746                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 747                         if (security_accepted & NEG_SIGN) {
 748                                 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 749                         }
 750                 } else if (security_accepted & NEG_NONE) {
 751                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 752                 } else {
 753                         DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
 754                         return NT_STATUS_ACCESS_DENIED;
 755                 }
 756
 757                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 758                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 759                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 760                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
 761                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 762                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
 763                 } else {
 764                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 765                 }
 766
 767                 *out = data_blob(NULL, 0);
 768                 return NT_STATUS_OK;
 769         }
 770         default:
 771                 return NT_STATUS_INVALID_PARAMETER;
 772         }
 773 }
 774
 775 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 776                                    TALLOC_CTX *mem_ctx,
 777                                    const DATA_BLOB *in,
 778                                    DATA_BLOB *out)
 779 {
 780         struct gensec_gssapi_state *gensec_gssapi_state
 781                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 782         OM_uint32 maj_stat, min_stat;
 783         gss_buffer_desc input_token, output_token;
 784         int conf_state;
 785         input_token.length = in->length;
 786         input_token.value = in->data;
 787
 788         maj_stat = gss_wrap(&min_stat,
 789                             gensec_gssapi_state->gssapi_context,
 790                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 791                             GSS_C_QOP_DEFAULT,
 792                             &input_token,
 793                             &conf_state,
 794                             &output_token);
 795         if (GSS_ERROR(maj_stat)) {
 796                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 797                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 798                 return NT_STATUS_ACCESS_DENIED;
 799         }
 800
 801         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 802         gss_release_buffer(&min_stat, &output_token);
 803
 804         if (gensec_gssapi_state->sasl) {
 805                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 806                 if (max_wrapped_size < out->length) {
 807                         DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
 808                                   (unsigned)in->length,
 809                                   (unsigned)out->length,
 810                                   (unsigned int)max_wrapped_size));
 811                         return NT_STATUS_INVALID_PARAMETER;
 812                 }
 813         }
 814
 815         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 816             && !conf_state) {
 817                 return NT_STATUS_ACCESS_DENIED;
 818         }
 819         return NT_STATUS_OK;
 820 }
 821
 822 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 823                                      TALLOC_CTX *mem_ctx,
 824                                      const DATA_BLOB *in,
 825                                      DATA_BLOB *out)
 826 {
 827         struct gensec_gssapi_state *gensec_gssapi_state
 828                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 829         OM_uint32 maj_stat, min_stat;
 830         gss_buffer_desc input_token, output_token;
 831         int conf_state;
 832         gss_qop_t qop_state;
 833         input_token.length = in->length;
 834         input_token.value = in->data;
 835
 836         if (gensec_gssapi_state->sasl) {
 837                 size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
 838                 if (max_wrapped_size < in->length) {
 839                         DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
 840                         return NT_STATUS_INVALID_PARAMETER;
 841                 }
 842         }
 843
 844         maj_stat = gss_unwrap(&min_stat,
 845                               gensec_gssapi_state->gssapi_context,
 846                               &input_token,
 847                               &output_token,
 848                               &conf_state,
 849                               &qop_state);
 850         if (GSS_ERROR(maj_stat)) {
 851                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 852                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 853                 return NT_STATUS_ACCESS_DENIED;
 854         }
 855
 856         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 857         gss_release_buffer(&min_stat, &output_token);
 858
 859         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 860             && !conf_state) {
 861                 return NT_STATUS_ACCESS_DENIED;
 862         }
 863         return NT_STATUS_OK;
 864 }
 865
 866 /* Find out the maximum input size negotiated on this connection */
 867
 868 static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
 869 {
 870         struct gensec_gssapi_state *gensec_gssapi_state
 871                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 872         OM_uint32 maj_stat, min_stat;
 873         OM_uint32 max_input_size;
 874
 875         maj_stat = gss_wrap_size_limit(&min_stat,
 876                                        gensec_gssapi_state->gssapi_context,
 877                                        gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 878                                        GSS_C_QOP_DEFAULT,
 879                                        gensec_gssapi_state->max_wrap_buf_size,
 880                                        &max_input_size);
 881         if (GSS_ERROR(maj_stat)) {
 882                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 883                 DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 884                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 885                 talloc_free(mem_ctx);
 886                 return 0;
 887         }
 888
 889         return max_input_size;
 890 }
 891
 892 /* Find out the maximum output size negotiated on this connection */
 893 static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
 894 {
 895         struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
 896         return gensec_gssapi_state->max_wrap_buf_size;
 897 }
 898
 899 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 900                                           TALLOC_CTX *mem_ctx,
 901                                           uint8_t *data, size_t length,
 902                                           const uint8_t *whole_pdu, size_t pdu_length,
 903                                           DATA_BLOB *sig)
 904 {
 905         struct gensec_gssapi_state *gensec_gssapi_state
 906                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 907         OM_uint32 maj_stat, min_stat;
 908         gss_buffer_desc input_token, output_token;
 909         int conf_state;
 910         ssize_t sig_length;
 911
 912         input_token.length = length;
 913         input_token.value = data;
 914
 915         maj_stat = gss_wrap(&min_stat,
 916                             gensec_gssapi_state->gssapi_context,
 917                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 918                             GSS_C_QOP_DEFAULT,
 919                             &input_token,
 920                             &conf_state,
 921                             &output_token);
 922         if (GSS_ERROR(maj_stat)) {
 923                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
 924                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 925                 return NT_STATUS_ACCESS_DENIED;
 926         }
 927
 928         if (output_token.length < input_token.length) {
 929                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
 930                           (long)output_token.length, (long)length));
 931                 return NT_STATUS_INTERNAL_ERROR;
 932         }
 933         sig_length = output_token.length - input_token.length;
 934
 935         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
 936         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
 937
 938         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 939         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
 940         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
 941
 942         gss_release_buffer(&min_stat, &output_token);
 943
 944         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 945             && !conf_state) {
 946                 return NT_STATUS_ACCESS_DENIED;
 947         }
 948         return NT_STATUS_OK;
 949 }
 950
 951 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
 952                                             TALLOC_CTX *mem_ctx,
 953                                             uint8_t *data, size_t length,
 954                                             const uint8_t *whole_pdu, size_t pdu_length,
 955                                             const DATA_BLOB *sig)
 956 {
 957         struct gensec_gssapi_state *gensec_gssapi_state
 958                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 959         OM_uint32 maj_stat, min_stat;
 960         gss_buffer_desc input_token, output_token;
 961         int conf_state;
 962         gss_qop_t qop_state;
 963         DATA_BLOB in;
 964
 965         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
 966
 967         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
 968
 969         memcpy(in.data, sig->data, sig->length);
 970         memcpy(in.data + sig->length, data, length);
 971
 972         input_token.length = in.length;
 973         input_token.value = in.data;
 974
 975         maj_stat = gss_unwrap(&min_stat,
 976                               gensec_gssapi_state->gssapi_context,
 977                               &input_token,
 978                               &output_token,
 979                               &conf_state,
 980                               &qop_state);
 981         if (GSS_ERROR(maj_stat)) {
 982                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
 983                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
 984                 return NT_STATUS_ACCESS_DENIED;
 985         }
 986
 987         if (output_token.length != length) {
 988                 return NT_STATUS_INTERNAL_ERROR;
 989         }
 990
 991         memcpy(data, output_token.value, length);
 992
 993         gss_release_buffer(&min_stat, &output_token);
 994
 995         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 996             && !conf_state) {
 997                 return NT_STATUS_ACCESS_DENIED;
 998         }
 999         return NT_STATUS_OK;
1000 }
1001
1002 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
1003                                           TALLOC_CTX *mem_ctx,
1004                                           const uint8_t *data, size_t length,
1005                                           const uint8_t *whole_pdu, size_t pdu_length,
1006                                           DATA_BLOB *sig)
1007 {
1008         struct gensec_gssapi_state *gensec_gssapi_state
1009                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1010         OM_uint32 maj_stat, min_stat;
1011         gss_buffer_desc input_token, output_token;
1012         int conf_state;
1013         ssize_t sig_length = 0;
1014
1015         input_token.length = length;
1016         input_token.value = discard_const_p(uint8_t *, data);
1017
1018         maj_stat = gss_wrap(&min_stat,
1019                             gensec_gssapi_state->gssapi_context,
1020                             0,
1021                             GSS_C_QOP_DEFAULT,
1022                             &input_token,
1023                             &conf_state,
1024                             &output_token);
1025         if (GSS_ERROR(maj_stat)) {
1026                 DEBUG(1, ("GSS Wrap failed: %s\n",
1027                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1028                 return NT_STATUS_ACCESS_DENIED;
1029         }
1030
1031         if (output_token.length < input_token.length) {
1032                 DEBUG(1, ("gensec_gssapi_sign_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
1033                           (long)output_token.length, (long)length));
1034                 return NT_STATUS_INTERNAL_ERROR;
1035         }
1036
1037         /* Caller must pad to right boundary */
1038         sig_length = output_token.length - input_token.length;
1039
1040         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
1041
1042         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1043
1044         gss_release_buffer(&min_stat, &output_token);
1045
1046         return NT_STATUS_OK;
1047 }
1048
1049 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
1050                                            TALLOC_CTX *mem_ctx,
1051                                            const uint8_t *data, size_t length,
1052                                            const uint8_t *whole_pdu, size_t pdu_length,
1053                                            const DATA_BLOB *sig)
1054 {
1055         struct gensec_gssapi_state *gensec_gssapi_state
1056                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1057         OM_uint32 maj_stat, min_stat;
1058         gss_buffer_desc input_token, output_token;
1059         int conf_state;
1060         gss_qop_t qop_state;
1061         DATA_BLOB in;
1062
1063         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
1064
1065         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
1066
1067         memcpy(in.data, sig->data, sig->length);
1068         memcpy(in.data + sig->length, data, length);
1069
1070         input_token.length = in.length;
1071         input_token.value = in.data;
1072
1073         maj_stat = gss_unwrap(&min_stat,
1074                               gensec_gssapi_state->gssapi_context,
1075                               &input_token,
1076                               &output_token,
1077                               &conf_state,
1078                               &qop_state);
1079         if (GSS_ERROR(maj_stat)) {
1080                 DEBUG(1, ("GSS UnWrap failed: %s\n",
1081                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1082                 return NT_STATUS_ACCESS_DENIED;
1083         }
1084
1085         if (output_token.length != length) {
1086                 return NT_STATUS_INTERNAL_ERROR;
1087         }
1088
1089         gss_release_buffer(&min_stat, &output_token);
1090
1091         return NT_STATUS_OK;
1092 }
1093
1094 /* Try to figure out what features we actually got on the connection */
1095 static BOOL gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1096                                        uint32_t feature)
1097 {
1098         struct gensec_gssapi_state *gensec_gssapi_state
1099                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1100         if (feature & GENSEC_FEATURE_SIGN) {
1101                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1102                 if (gensec_gssapi_state->sasl
1103                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1104                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1105                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1106                 }
1107                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1108         }
1109         if (feature & GENSEC_FEATURE_SEAL) {
1110                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1111                 if (gensec_gssapi_state->sasl
1112                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1113                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1114                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1115                 }
1116                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1117         }
1118         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1119                 /* Only for GSSAPI/Krb5 */
1120                 if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
1121                         return True;
1122                 }
1123         }
1124         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1125                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1126         }
1127         /* We can always do async (rather than strict request/reply) packets.  */
1128         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1129                 return True;
1130         }
1131         return False;
1132 }
1133
1134 /*
1135  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1136  * (for encrypting some passwords).
1137  *
1138  * This breaks all the abstractions, but what do you expect...
1139  */
1140 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1141                                           DATA_BLOB *session_key)
1142 {
1143         struct gensec_gssapi_state *gensec_gssapi_state
1144                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1145         OM_uint32 maj_stat, min_stat;
1146         krb5_keyblock *subkey;
1147
1148         if (gensec_gssapi_state->session_key.data) {
1149                 *session_key = gensec_gssapi_state->session_key;
1150                 return NT_STATUS_OK;
1151         }
1152
1153         maj_stat = gsskrb5_get_initiator_subkey(&min_stat,
1154                                                 gensec_gssapi_state->gssapi_context,
1155                                                 &subkey);
1156         if (maj_stat != 0) {
1157                 DEBUG(1, ("NO session key for this mech\n"));
1158                 return NT_STATUS_NO_USER_SESSION_KEY;
1159         }
1160
1161         DEBUG(10, ("Got KRB5 session key of length %d\n",
1162                    (int)KRB5_KEY_LENGTH(subkey)));
1163         gensec_gssapi_state->session_key = data_blob_talloc(gensec_gssapi_state,
1164                                                             KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
1165         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
1166         *session_key = gensec_gssapi_state->session_key;
1167         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1168
1169         return NT_STATUS_OK;
1170 }
1171
1172 /* Get some basic (and authorization) information about the user on
1173  * this session.  This uses either the PAC (if present) or a local
1174  * database lookup */
1175 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1176                                            struct auth_session_info **_session_info)
1177 {
1178         NTSTATUS nt_status;
1179         TALLOC_CTX *mem_ctx;
1180         struct gensec_gssapi_state *gensec_gssapi_state
1181                 = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
1182         struct auth_serversupplied_info *server_info = NULL;
1183         struct auth_session_info *session_info = NULL;
1184         struct PAC_LOGON_INFO *logon_info;
1185         OM_uint32 maj_stat, min_stat;
1186         gss_buffer_desc name_token;
1187         gss_buffer_desc pac;
1188         krb5_keyblock *keyblock;
1189         time_t authtime;
1190         krb5_principal principal;
1191         char *principal_string;
1192         DATA_BLOB pac_blob;
1193
1194         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1195             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1196                        gensec_gssapi_state->gss_oid->length) != 0)) {
1197                 DEBUG(1, ("NO session info available for this mech\n"));
1198                 return NT_STATUS_INVALID_PARAMETER;
1199         }
1200
1201         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1202         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1203
1204         maj_stat = gss_display_name (&min_stat,
1205                                      gensec_gssapi_state->client_name,
1206                                      &name_token,
1207                                      NULL);
1208         if (GSS_ERROR(maj_stat)) {
1209                 DEBUG(1, ("GSS display_name failed: %s\n",
1210                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1211                 talloc_free(mem_ctx);
1212                 return NT_STATUS_FOOBAR;
1213         }
1214
1215         principal_string = talloc_strndup(mem_ctx, name_token.value, name_token.length);
1216
1217         gss_release_buffer(&min_stat, &name_token);
1218
1219         if (!principal_string) {
1220                 talloc_free(mem_ctx);
1221                 return NT_STATUS_NO_MEMORY;
1222         }
1223
1224         maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1225                                                                gensec_gssapi_state->gssapi_context,
1226                                                                KRB5_AUTHDATA_WIN2K_PAC,
1227                                                                &pac);
1228
1229
1230         if (maj_stat == 0) {
1231                 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1232                 gss_release_buffer(&min_stat, &pac);
1233
1234         } else {
1235                 pac_blob = data_blob(NULL, 0);
1236         }
1237
1238         /* IF we have the PAC - otherwise we need to get this
1239          * data from elsewere - local ldb, or (TODO) lookup of some
1240          * kind...
1241          */
1242         if (pac_blob.length) {
1243                 krb5_error_code ret;
1244                 union netr_Validation validation;
1245
1246                 maj_stat = gsskrb5_extract_authtime_from_sec_context(&min_stat,
1247                                                                      gensec_gssapi_state->gssapi_context,
1248                                                                      &authtime);
1249
1250                 if (GSS_ERROR(maj_stat)) {
1251                         DEBUG(1, ("gsskrb5_extract_authtime_from_sec_context: %s\n",
1252                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1253                         talloc_free(mem_ctx);
1254                         return NT_STATUS_FOOBAR;
1255                 }
1256
1257                 maj_stat = gsskrb5_extract_service_keyblock(&min_stat,
1258                                                             gensec_gssapi_state->gssapi_context,
1259                                                             &keyblock);
1260
1261                 if (GSS_ERROR(maj_stat)) {
1262                         DEBUG(1, ("gsskrb5_copy_service_keyblock failed: %s\n",
1263                                   gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1264                         talloc_free(mem_ctx);
1265                         return NT_STATUS_FOOBAR;
1266                 }
1267
1268                 ret = krb5_parse_name_flags(gensec_gssapi_state->smb_krb5_context->krb5_context,
1269                                             principal_string,
1270                                             KRB5_PRINCIPAL_PARSE_MUST_REALM,
1271                                             &principal);
1272                 if (ret) {
1273                         krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context,
1274                                            keyblock);
1275                         talloc_free(mem_ctx);
1276                         return NT_STATUS_INVALID_PARAMETER;
1277                 }
1278
1279                 /* decode and verify the pac */
1280                 nt_status = kerberos_pac_logon_info(mem_ctx, &logon_info, pac_blob,
1281                                                     gensec_gssapi_state->smb_krb5_context->krb5_context,
1282                                                     NULL, keyblock, principal, authtime, NULL);
1283                 krb5_free_principal(gensec_gssapi_state->smb_krb5_context->krb5_context, principal);
1284                 krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context,
1285                                    keyblock);
1286
1287                 if (!NT_STATUS_IS_OK(nt_status)) {
1288                         talloc_free(mem_ctx);
1289                         return nt_status;
1290                 }
1291                 validation.sam3 = &logon_info->info3;
1292                 nt_status = make_server_info_netlogon_validation(gensec_gssapi_state,
1293                                                                  NULL,
1294                                                                  3, &validation,
1295                                                                  &server_info);
1296                 if (!NT_STATUS_IS_OK(nt_status)) {
1297                         talloc_free(mem_ctx);
1298                         return nt_status;
1299                 }
1300         } else if (!lp_parm_bool(-1, "gensec", "require_pac", False)) {
1301                 DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
1302                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1303                 nt_status = sam_get_server_info_principal(mem_ctx, principal_string,
1304                                                           &server_info);
1305
1306                 if (!NT_STATUS_IS_OK(nt_status)) {
1307                         talloc_free(mem_ctx);
1308                         return nt_status;
1309                 }
1310         } else {
1311                 DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
1312                           principal_string,
1313                           gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
1314                 return NT_STATUS_ACCESS_DENIED;
1315         }
1316
1317         /* references the server_info into the session_info */
1318         nt_status = auth_generate_session_info(mem_ctx, server_info, &session_info);
1319         if (!NT_STATUS_IS_OK(nt_status)) {
1320                 talloc_free(mem_ctx);
1321                 return nt_status;
1322         }
1323
1324         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1325         if (!NT_STATUS_IS_OK(nt_status)) {
1326                 talloc_free(mem_ctx);
1327                 return nt_status;
1328         }
1329
1330         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1331                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1332         } else {
1333                 krb5_error_code ret;
1334                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1335                 session_info->credentials = cli_credentials_init(session_info);
1336                 if (!session_info->credentials) {
1337                         talloc_free(mem_ctx);
1338                         return NT_STATUS_NO_MEMORY;
1339                 }
1340
1341                 cli_credentials_set_conf(session_info->credentials);
1342                 /* Just so we don't segfault trying to get at a username */
1343                 cli_credentials_set_anonymous(session_info->credentials);
1344
1345                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1346                                                            gensec_gssapi_state->delegated_cred_handle,
1347                                                            CRED_SPECIFIED);
1348                 if (ret) {
1349                         talloc_free(mem_ctx);
1350                         return NT_STATUS_NO_MEMORY;
1351                 }
1352
1353                 /* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
1354                 cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
1355
1356                 /* It has been taken from this place... */
1357                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1358         }
1359         talloc_steal(gensec_gssapi_state, session_info);
1360         talloc_free(mem_ctx);
1361         *_session_info = session_info;
1362
1363         return NT_STATUS_OK;
1364 }
1365
1366 static const char *gensec_gssapi_krb5_oids[] = {
1367         GENSEC_OID_KERBEROS5_OLD,
1368         GENSEC_OID_KERBEROS5,
1369         NULL
1370 };
1371
1372 static const char *gensec_gssapi_spnego_oids[] = {
1373         GENSEC_OID_SPNEGO,
1374         NULL
1375 };
1376
1377 /* As a server, this could in theory accept any GSSAPI mech */
1378 static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
1379         .name           = "gssapi_spnego",
1380         .sasl_name      = "GSS-SPNEGO",
1381         .auth_type      = DCERPC_AUTH_TYPE_SPNEGO,
1382         .oid            = gensec_gssapi_spnego_oids,
1383         .client_start   = gensec_gssapi_client_start,
1384         .server_start   = gensec_gssapi_server_start,
1385         .magic          = gensec_gssapi_magic,
1386         .update         = gensec_gssapi_update,
1387         .session_key    = gensec_gssapi_session_key,
1388         .session_info   = gensec_gssapi_session_info,
1389         .sign_packet    = gensec_gssapi_sign_packet,
1390         .check_packet   = gensec_gssapi_check_packet,
1391         .seal_packet    = gensec_gssapi_seal_packet,
1392         .unseal_packet  = gensec_gssapi_unseal_packet,
1393         .wrap           = gensec_gssapi_wrap,
1394         .unwrap         = gensec_gssapi_unwrap,
1395         .have_feature   = gensec_gssapi_have_feature,
1396         .enabled        = False,
1397         .kerberos       = True,
1398         .priority       = GENSEC_GSSAPI
1399 };
1400
1401 /* As a server, this could in theory accept any GSSAPI mech */
1402 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1403         .name           = "gssapi_krb5",
1404         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1405         .oid            = gensec_gssapi_krb5_oids,
1406         .client_start   = gensec_gssapi_client_start,
1407         .server_start   = gensec_gssapi_server_start,
1408         .magic          = gensec_gssapi_magic,
1409         .update         = gensec_gssapi_update,
1410         .session_key    = gensec_gssapi_session_key,
1411         .session_info   = gensec_gssapi_session_info,
1412         .sign_packet    = gensec_gssapi_sign_packet,
1413         .check_packet   = gensec_gssapi_check_packet,
1414         .seal_packet    = gensec_gssapi_seal_packet,
1415         .unseal_packet  = gensec_gssapi_unseal_packet,
1416         .wrap           = gensec_gssapi_wrap,
1417         .unwrap         = gensec_gssapi_unwrap,
1418         .have_feature   = gensec_gssapi_have_feature,
1419         .enabled        = True,
1420         .kerberos       = True,
1421         .priority       = GENSEC_GSSAPI
1422 };
1423
1424 /* As a server, this could in theory accept any GSSAPI mech */
1425 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1426         .name             = "gssapi_krb5_sasl",
1427         .sasl_name        = "GSSAPI",
1428         .client_start     = gensec_gssapi_sasl_client_start,
1429         .server_start     = gensec_gssapi_sasl_server_start,
1430         .update           = gensec_gssapi_update,
1431         .session_key      = gensec_gssapi_session_key,
1432         .session_info     = gensec_gssapi_session_info,
1433         .max_input_size   = gensec_gssapi_max_input_size,
1434         .max_wrapped_size = gensec_gssapi_max_wrapped_size,
1435         .wrap             = gensec_gssapi_wrap,
1436         .unwrap           = gensec_gssapi_unwrap,
1437         .have_feature     = gensec_gssapi_have_feature,
1438         .enabled          = True,
1439         .kerberos         = True,
1440         .priority         = GENSEC_GSSAPI
1441 };
1442
1443 NTSTATUS gensec_gssapi_init(void)
1444 {
1445         NTSTATUS ret;
1446
1447         ret = gensec_register(&gensec_gssapi_spnego_security_ops);
1448         if (!NT_STATUS_IS_OK(ret)) {
1449                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1450                         gensec_gssapi_spnego_security_ops.name));
1451                 return ret;
1452         }
1453
1454         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1455         if (!NT_STATUS_IS_OK(ret)) {
1456                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1457                         gensec_gssapi_krb5_security_ops.name));
1458                 return ret;
1459         }
1460
1461         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1462         if (!NT_STATUS_IS_OK(ret)) {
1463                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1464                         gensec_gssapi_sasl_krb5_security_ops.name));
1465                 return ret;
1466         }
1467
1468         return ret;
1469 }