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 "auth/kerberos/kerberos.h"
  28 #include "librpc/gen_ndr/krb5pac.h"
  29 #include "auth/auth.h"
  30 #include "lib/ldb/include/ldb.h"
  31 #include "auth/auth_sam.h"
  32 #include "librpc/rpc/dcerpc.h"
  33
  34 enum gensec_gssapi_sasl_state
  35 {
  36         STAGE_GSS_NEG,
  37         STAGE_SASL_SSF_NEG,
  38         STAGE_SASL_SSF_ACCEPT,
  39         STAGE_DONE
  40 };
  41
  42 #define NEG_SEAL 0x4
  43 #define NEG_SIGN 0x2
  44 #define NEG_NONE 0x1
  45
  46 struct gensec_gssapi_state {
  47         gss_ctx_id_t gssapi_context;
  48         struct gss_channel_bindings_struct *input_chan_bindings;
  49         gss_name_t server_name;
  50         gss_name_t client_name;
  51         OM_uint32 want_flags, got_flags;
  52         const gss_OID_desc *gss_oid;
  53
  54         DATA_BLOB session_key;
  55         DATA_BLOB pac;
  56
  57         struct smb_krb5_context *smb_krb5_context;
  58         struct gssapi_creds_container *client_cred;
  59         struct gssapi_creds_container *server_cred;
  60
  61         gss_cred_id_t delegated_cred_handle;
  62
  63         BOOL sasl; /* We have two different mechs in this file: One
  64                     * for SASL wrapped GSSAPI and another for normal
  65                     * GSSAPI */
  66         enum gensec_gssapi_sasl_state sasl_state;
  67         uint8_t sasl_protection; /* What was negotiated at the SASL
  68                                   * layer, independent of the GSSAPI
  69                                   * layer... */
  70 };
  71
  72 static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
  73                                  OM_uint32 maj_stat, OM_uint32 min_stat)
  74 {
  75         OM_uint32 disp_min_stat, disp_maj_stat;
  76         gss_buffer_desc maj_error_message;
  77         gss_buffer_desc min_error_message;
  78         OM_uint32 msg_ctx = 0;
  79
  80         char *ret;
  81
  82         maj_error_message.value = NULL;
  83         min_error_message.value = NULL;
  84
  85         disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
  86                            GSS_C_NULL_OID, &msg_ctx, &maj_error_message);
  87         disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
  88                            GSS_C_NULL_OID, &msg_ctx, &min_error_message);
  89         ret = talloc_asprintf(mem_ctx, "%s: %s", (char *)maj_error_message.value, (char *)min_error_message.value);
  90
  91         gss_release_buffer(&disp_min_stat, &maj_error_message);
  92         gss_release_buffer(&disp_min_stat, &min_error_message);
  93
  94         return ret;
  95 }
  96
  97
  98 static int gensec_gssapi_destory(void *ptr)
  99 {
 100         struct gensec_gssapi_state *gensec_gssapi_state = ptr;
 101         OM_uint32 maj_stat, min_stat;
 102
 103         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
 104                 maj_stat = gss_release_cred(&min_stat,
 105                                             &gensec_gssapi_state->delegated_cred_handle);
 106         }
 107
 108         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
 109                 maj_stat = gss_delete_sec_context (&min_stat,
 110                                                    &gensec_gssapi_state->gssapi_context,
 111                                                    GSS_C_NO_BUFFER);
 112         }
 113
 114         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
 115                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
 116         }
 117         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
 118                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
 119         }
 120         return 0;
 121 }
 122
 123 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 124 {
 125         struct gensec_gssapi_state *gensec_gssapi_state;
 126         krb5_error_code ret;
 127
 128         gensec_gssapi_state = talloc(gensec_security, struct gensec_gssapi_state);
 129         if (!gensec_gssapi_state) {
 130                 return NT_STATUS_NO_MEMORY;
 131         }
 132
 133         gensec_gssapi_state->sasl = False;
 134         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 135
 136         gensec_security->private_data = gensec_gssapi_state;
 137
 138         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 139         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 140         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 141
 142         /* TODO: Fill in channel bindings */
 143         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 144
 145         gensec_gssapi_state->want_flags = 0;
 146         if (lp_parm_bool(-1, "gensec_gssapi", "mutual", True)) {
 147                 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
 148         }
 149         if (lp_parm_bool(-1, "gensec_gssapi", "delegation", True)) {
 150                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
 151         }
 152         if (lp_parm_bool(-1, "gensec_gssapi", "sequence", True)) {
 153                 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
 154         }
 155
 156         gensec_gssapi_state->got_flags = 0;
 157
 158         gensec_gssapi_state->session_key = data_blob(NULL, 0);
 159         gensec_gssapi_state->pac = data_blob(NULL, 0);
 160
 161         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 162
 163         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destory);
 164
 165         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 166                 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
 167         }
 168         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 169                 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
 170         }
 171         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 172                 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
 173         }
 174
 175         gensec_gssapi_state->gss_oid = gss_mech_krb5;
 176
 177         ret = smb_krb5_init_context(gensec_gssapi_state,
 178                                     &gensec_gssapi_state->smb_krb5_context);
 179         if (ret) {
 180                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
 181                          error_message(ret)));
 182                 return NT_STATUS_INTERNAL_ERROR;
 183         }
 184         return NT_STATUS_OK;
 185 }
 186
 187 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 188 {
 189         NTSTATUS nt_status;
 190         int ret;
 191         struct gensec_gssapi_state *gensec_gssapi_state;
 192         struct cli_credentials *machine_account;
 193         struct gssapi_creds_container *gcc;
 194
 195         nt_status = gensec_gssapi_start(gensec_security);
 196         if (!NT_STATUS_IS_OK(nt_status)) {
 197                 return nt_status;
 198         }
 199
 200         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 201
 202         machine_account = gensec_get_credentials(gensec_security);
 203
 204         if (!machine_account) {
 205                 DEBUG(3, ("No machine account credentials specified\n"));
 206                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 207         } else {
 208                 ret = cli_credentials_get_server_gss_creds(machine_account, &gcc);
 209                 if (ret) {
 210                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 211                                   error_message(ret)));
 212                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 213                 }
 214         }
 215
 216         gensec_gssapi_state->server_cred = gcc;
 217         return NT_STATUS_OK;
 218
 219 }
 220
 221 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 222 {
 223         NTSTATUS nt_status;
 224         struct gensec_gssapi_state *gensec_gssapi_state;
 225         nt_status = gensec_gssapi_server_start(gensec_security);
 226
 227         if (NT_STATUS_IS_OK(nt_status)) {
 228                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 229                 gensec_gssapi_state->sasl = True;
 230         }
 231         return nt_status;
 232 }
 233
 234 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 235 {
 236         struct gensec_gssapi_state *gensec_gssapi_state;
 237         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 238         krb5_error_code ret;
 239         NTSTATUS nt_status;
 240         gss_buffer_desc name_token;
 241         gss_OID name_type;
 242         OM_uint32 maj_stat, min_stat;
 243         const char *hostname = gensec_get_target_hostname(gensec_security);
 244         const char *principal;
 245         struct gssapi_creds_container *gcc;
 246
 247         if (!hostname) {
 248                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 249                 return NT_STATUS_INVALID_PARAMETER;
 250         }
 251         if (is_ipaddress(hostname)) {
 252                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 253                 return NT_STATUS_INVALID_PARAMETER;
 254         }
 255         if (strcmp(hostname, "localhost") == 0) {
 256                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 257                 return NT_STATUS_INVALID_PARAMETER;
 258         }
 259
 260         nt_status = gensec_gssapi_start(gensec_security);
 261         if (!NT_STATUS_IS_OK(nt_status)) {
 262                 return nt_status;
 263         }
 264
 265         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 266
 267         principal = gensec_get_target_principal(gensec_security);
 268         if (principal && lp_client_use_spnego_principal()) {
 269                 name_token.value  = discard_const_p(uint8_t, principal);
 270                 name_token.length = strlen(principal);
 271
 272                 name_type = GSS_C_NULL_OID;
 273         } else {
 274                 principal = talloc_asprintf(gensec_gssapi_state, "%s@%s",
 275                                             gensec_get_target_service(gensec_security),
 276                                             hostname);
 277
 278                 name_token.value  = discard_const_p(uint8_t, principal);
 279                 name_token.length = strlen(principal);
 280
 281                 name_type = GSS_C_NT_HOSTBASED_SERVICE;
 282         }
 283
 284         maj_stat = gss_import_name (&min_stat,
 285                                     &name_token,
 286                                     name_type,
 287                                     &gensec_gssapi_state->server_name);
 288         if (maj_stat) {
 289                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 290                           (char *)name_token.value,
 291                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
 292                 return NT_STATUS_INVALID_PARAMETER;
 293         }
 294
 295         ret = cli_credentials_get_client_gss_creds(creds, &gcc);
 296         switch (ret) {
 297         case 0:
 298                 break;
 299         case KRB5_KDC_UNREACH:
 300                 DEBUG(3, ("Cannot reach a KDC we require\n"));
 301                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 302         default:
 303                 DEBUG(1, ("Aquiring initiator credentails failed\n"));
 304                 return NT_STATUS_UNSUCCESSFUL;
 305         }
 306
 307         gensec_gssapi_state->client_cred = gcc;
 308
 309         return NT_STATUS_OK;
 310 }
 311
 312 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 313 {
 314         NTSTATUS nt_status;
 315         struct gensec_gssapi_state *gensec_gssapi_state;
 316         nt_status = gensec_gssapi_client_start(gensec_security);
 317
 318         if (NT_STATUS_IS_OK(nt_status)) {
 319                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 320                 gensec_gssapi_state->sasl = True;
 321         }
 322         return nt_status;
 323 }
 324
 325
 326 /**
 327  * Check if the packet is one for this mechansim
 328  *
 329  * @param gensec_security GENSEC state
 330  * @param in The request, as a DATA_BLOB
 331  * @return Error, INVALID_PARAMETER if it's not a packet for us
 332  *                or NT_STATUS_OK if the packet is ok.
 333  */
 334
 335 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 336                                     const DATA_BLOB *in)
 337 {
 338         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 339                 return NT_STATUS_OK;
 340         } else {
 341                 return NT_STATUS_INVALID_PARAMETER;
 342         }
 343 }
 344
 345
 346 /**
 347  * Next state function for the GSSAPI GENSEC mechanism
 348  *
 349  * @param gensec_gssapi_state GSSAPI State
 350  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 351  * @param in The request, as a DATA_BLOB
 352  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 353  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 354  *                or NT_STATUS_OK if the user is authenticated.
 355  */
 356
 357 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 358                                    TALLOC_CTX *out_mem_ctx,
 359                                    const DATA_BLOB in, DATA_BLOB *out)
 360 {
 361         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 362         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 363         OM_uint32 maj_stat, min_stat;
 364         OM_uint32 min_stat2;
 365         gss_buffer_desc input_token, output_token;
 366         gss_OID gss_oid_p;
 367         input_token.length = in.length;
 368         input_token.value = in.data;
 369
 370         switch (gensec_gssapi_state->sasl_state) {
 371         case STAGE_GSS_NEG:
 372         {
 373                 switch (gensec_security->gensec_role) {
 374                 case GENSEC_CLIENT:
 375                 {
 376                         maj_stat = gss_init_sec_context(&min_stat,
 377                                                         gensec_gssapi_state->client_cred->creds,
 378                                                         &gensec_gssapi_state->gssapi_context,
 379                                                         gensec_gssapi_state->server_name,
 380                                                         discard_const_p(gss_OID_desc, gensec_gssapi_state->gss_oid),
 381                                                         gensec_gssapi_state->want_flags,
 382                                                         0,
 383                                                         gensec_gssapi_state->input_chan_bindings,
 384                                                         &input_token,
 385                                                         NULL,
 386                                                         &output_token,
 387                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 388                                                         NULL);
 389                         break;
 390                 }
 391                 case GENSEC_SERVER:
 392                 {
 393                         maj_stat = gss_accept_sec_context(&min_stat,
 394                                                           &gensec_gssapi_state->gssapi_context,
 395                                                           gensec_gssapi_state->server_cred->creds,
 396                                                           &input_token,
 397                                                           gensec_gssapi_state->input_chan_bindings,
 398                                                           &gensec_gssapi_state->client_name,
 399                                                           &gss_oid_p,
 400                                                           &output_token,
 401                                                           &gensec_gssapi_state->got_flags,
 402                                                           NULL,
 403                                                           &gensec_gssapi_state->delegated_cred_handle);
 404                         gensec_gssapi_state->gss_oid = gss_oid_p;
 405                         break;
 406                 }
 407                 default:
 408                         return NT_STATUS_INVALID_PARAMETER;
 409
 410                 }
 411
 412                 if (maj_stat == GSS_S_COMPLETE) {
 413                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 414                         gss_release_buffer(&min_stat2, &output_token);
 415
 416                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 417                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 418                         } else {
 419                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 420                         }
 421
 422                         /* We may have been invoked as SASL, so there
 423                          * is more work to do */
 424                         if (gensec_gssapi_state->sasl) {
 425                                 /* Due to a very subtle interaction
 426                                  * with SASL and the LDAP libs, we
 427                                  * must ensure the data pointer is
 428                                  * != NULL, but the length is 0.
 429                                  *
 430                                  * This ensures we send a 'zero
 431                                  * length' (rather than NULL) response
 432                                  */
 433
 434                                 if (!out->data) {
 435                                         out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
 436                                 }
 437
 438                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 439                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 440                         } else {
 441                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 442
 443                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 444                                         DEBUG(5, ("GSSAPI Connection will be cryptographicly sealed\n"));
 445                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 446                                         DEBUG(5, ("GSSAPI Connection will be cryptographicly signed\n"));
 447                                 } else {
 448                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 449                                 }
 450
 451                                 return NT_STATUS_OK;
 452                         }
 453                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 454                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 455                         gss_release_buffer(&min_stat2, &output_token);
 456
 457                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 458                 } else if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
 459                            && (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
 460                                       gensec_gssapi_state->gss_oid->length) == 0)) {
 461                         switch (min_stat) {
 462                         case KRB5_KDC_UNREACH:
 463                                 DEBUG(3, ("Cannot reach a KDC we require: %s\n",
 464                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
 465                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 466                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 467                                 DEBUG(3, ("Server is not registered with our KDC: %s\n",
 468                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
 469                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 470                         case KRB5KRB_AP_ERR_MSG_TYPE:
 471                                 /* garbage input, possibly from the auto-mech detection */
 472                                 return NT_STATUS_INVALID_PARAMETER;
 473                         default:
 474                                 DEBUG(1, ("GSS(krb5) Update failed: %s\n",
 475                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 476                                 return nt_status;
 477                         }
 478                 } else {
 479                         DEBUG(1, ("GSS Update failed: %s\n",
 480                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 481                         return nt_status;
 482                 }
 483                 break;
 484         }
 485         /* These last two stages are only done if we were invoked as SASL */
 486         case STAGE_SASL_SSF_NEG:
 487         {
 488                 switch (gensec_security->gensec_role) {
 489                 case GENSEC_CLIENT:
 490                 {
 491                         uint8_t maxlength_proposed[4];
 492                         uint8_t security_supported;
 493                         int conf_state;
 494                         gss_qop_t qop_state;
 495                         input_token.length = in.length;
 496                         input_token.value = in.data;
 497
 498                         maj_stat = gss_unwrap(&min_stat,
 499                                               gensec_gssapi_state->gssapi_context,
 500                                               &input_token,
 501                                               &output_token,
 502                                               &conf_state,
 503                                               &qop_state);
 504                         if (GSS_ERROR(maj_stat)) {
 505                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 506                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 507                                 return NT_STATUS_ACCESS_DENIED;
 508                         }
 509
 510                         if (output_token.length < 4) {
 511                                 return NT_STATUS_INVALID_PARAMETER;
 512                         }
 513
 514                         memcpy(maxlength_proposed, output_token.value, 4);
 515                         gss_release_buffer(&min_stat, &output_token);
 516
 517                         /* first byte is the proposed security */
 518                         security_supported = maxlength_proposed[0];
 519                         maxlength_proposed[0] = '\0';
 520                         gensec_gssapi_state->sasl_protection = 0;
 521                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 522                                 if (security_supported & NEG_SEAL) {
 523                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 524                                 }
 525                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 526                                 if (security_supported & NEG_SIGN) {
 527                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 528                                 }
 529                         } else if (security_supported & NEG_NONE) {
 530                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 531                         } else {
 532                                 DEBUG(1, ("Remote server does not support unprotected connections"));
 533                                 return NT_STATUS_ACCESS_DENIED;
 534                         }
 535
 536                         /* We just accept their max length, and send
 537                          * it back with the SASL flags */
 538                         maxlength_proposed[0] = gensec_gssapi_state->sasl_protection;
 539
 540                         input_token.value = maxlength_proposed;
 541                         input_token.length = sizeof(maxlength_proposed);
 542
 543                         maj_stat = gss_wrap(&min_stat,
 544                                             gensec_gssapi_state->gssapi_context,
 545                                             False,
 546                                             GSS_C_QOP_DEFAULT,
 547                                             &input_token,
 548                                             &conf_state,
 549                                             &output_token);
 550                         if (GSS_ERROR(maj_stat)) {
 551                                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 552                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 553                                 return NT_STATUS_ACCESS_DENIED;
 554                         }
 555
 556                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 557                         gss_release_buffer(&min_stat, &output_token);
 558
 559                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 560                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 561
 562                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 563                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
 564                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 565                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
 566                         } else {
 567                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
 568                         }
 569
 570                         return NT_STATUS_OK;
 571                 }
 572                 case GENSEC_SERVER:
 573                 {
 574                         uint8_t maxlength_proposed[4];
 575                         uint8_t security_supported = 0x0;
 576                         int conf_state;
 577
 578                         /* TODO: Need some better ideas for this */
 579                         RSIVAL(maxlength_proposed, 0, 0xFFFFFF);
 580                         /* first byte is the proposed security */
 581                         maxlength_proposed[0] = '\0';
 582
 583                         gensec_gssapi_state->sasl_protection = 0;
 584                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 585                                 security_supported |= NEG_SEAL;
 586                         }
 587                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 588                                 security_supported |= NEG_SIGN;
 589                         }
 590                         if (security_supported == 0) {
 591                                 /* If we don't support anything, this must be 0 */
 592                                 RSIVAL(maxlength_proposed, 0, 0x0);
 593                         }
 594
 595                         /* TODO:  We may not wish to support this */
 596                         security_supported |= NEG_NONE;
 597
 598                         /* Ignore 'in' */
 599                         maxlength_proposed[0] = security_supported;
 600
 601                         input_token.value = maxlength_proposed;
 602                         input_token.length = sizeof(maxlength_proposed);
 603
 604                         maj_stat = gss_wrap(&min_stat,
 605                                             gensec_gssapi_state->gssapi_context,
 606                                             False,
 607                                             GSS_C_QOP_DEFAULT,
 608                                             &input_token,
 609                                             &conf_state,
 610                                             &output_token);
 611                         if (GSS_ERROR(maj_stat)) {
 612                                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 613                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 614                                 return NT_STATUS_ACCESS_DENIED;
 615                         }
 616
 617                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 618                         gss_release_buffer(&min_stat, &output_token);
 619
 620                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 621                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 622                 }
 623                 default:
 624                         return NT_STATUS_INVALID_PARAMETER;
 625
 626                 }
 627         }
 628         /* This is s server-only stage */
 629         case STAGE_SASL_SSF_ACCEPT:
 630         {
 631                 uint8_t maxlength_proposed[4];
 632                 uint8_t security_proposed;
 633                 int conf_state;
 634                 gss_qop_t qop_state;
 635                 input_token.length = in.length;
 636                 input_token.value = in.data;
 637
 638                 maj_stat = gss_unwrap(&min_stat,
 639                                       gensec_gssapi_state->gssapi_context,
 640                                       &input_token,
 641                                       &output_token,
 642                                       &conf_state,
 643                                       &qop_state);
 644                 if (GSS_ERROR(maj_stat)) {
 645                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 646                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 647                         return NT_STATUS_ACCESS_DENIED;
 648                 }
 649
 650                 if (output_token.length < 4) {
 651                         return NT_STATUS_INVALID_PARAMETER;
 652                 }
 653
 654                 memcpy(maxlength_proposed, output_token.value, 4);
 655                 gss_release_buffer(&min_stat, &output_token);
 656
 657                 /* first byte is the proposed security */
 658                 /* TODO: We should do something with the rest, but for now... */
 659                 security_proposed = maxlength_proposed[0];
 660
 661                 maxlength_proposed[0] = 0x0;
 662                 gensec_gssapi_state->sasl_protection = 0;
 663                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 664                         if (security_proposed & NEG_SEAL) {
 665                                 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 666                         }
 667                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 668                         if (security_proposed & NEG_SIGN) {
 669                                 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 670                         }
 671                 } else if (security_proposed & NEG_NONE) {
 672                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 673                 } else {
 674                         DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
 675                         return NT_STATUS_ACCESS_DENIED;
 676                 }
 677
 678                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 679                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 680                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 681                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
 682                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 683                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
 684                 } else {
 685                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 686                 }
 687
 688                 *out = data_blob(NULL, 0);
 689                 return NT_STATUS_OK;
 690         }
 691         default:
 692                 return NT_STATUS_INVALID_PARAMETER;
 693         }
 694 }
 695
 696 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 697                                    TALLOC_CTX *mem_ctx,
 698                                    const DATA_BLOB *in,
 699                                    DATA_BLOB *out)
 700 {
 701         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 702         OM_uint32 maj_stat, min_stat;
 703         gss_buffer_desc input_token, output_token;
 704         int conf_state;
 705         input_token.length = in->length;
 706         input_token.value = in->data;
 707
 708         maj_stat = gss_wrap(&min_stat,
 709                             gensec_gssapi_state->gssapi_context,
 710                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 711                             GSS_C_QOP_DEFAULT,
 712                             &input_token,
 713                             &conf_state,
 714                             &output_token);
 715         if (GSS_ERROR(maj_stat)) {
 716                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 717                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 718                 return NT_STATUS_ACCESS_DENIED;
 719         }
 720
 721         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 722         gss_release_buffer(&min_stat, &output_token);
 723
 724         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 725             && !conf_state) {
 726                 return NT_STATUS_ACCESS_DENIED;
 727         }
 728         return NT_STATUS_OK;
 729 }
 730
 731 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 732                                      TALLOC_CTX *mem_ctx,
 733                                      const DATA_BLOB *in,
 734                                      DATA_BLOB *out)
 735 {
 736         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 737         OM_uint32 maj_stat, min_stat;
 738         gss_buffer_desc input_token, output_token;
 739         int conf_state;
 740         gss_qop_t qop_state;
 741         input_token.length = in->length;
 742         input_token.value = in->data;
 743
 744         maj_stat = gss_unwrap(&min_stat,
 745                               gensec_gssapi_state->gssapi_context,
 746                               &input_token,
 747                               &output_token,
 748                               &conf_state,
 749                               &qop_state);
 750         if (GSS_ERROR(maj_stat)) {
 751                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 752                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 753                 return NT_STATUS_ACCESS_DENIED;
 754         }
 755
 756         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 757         gss_release_buffer(&min_stat, &output_token);
 758
 759         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 760             && !conf_state) {
 761                 return NT_STATUS_ACCESS_DENIED;
 762         }
 763         return NT_STATUS_OK;
 764 }
 765
 766 /* Find out the size of the signature, assuming (incorrectly) that it
 767  * GSSAPI provides any guarantees as to it's size.
 768  *
 769  * This is needed by the DCE/RPC code, which uses AEAD
 770  * (signed headers, including signature legnth and a sealed body)
 771  */
 772 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
 773 {
 774         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 775         OM_uint32 maj_stat, min_stat;
 776         OM_uint32 output_size;
 777         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
 778             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
 779                        gensec_gssapi_state->gss_oid->length) != 0)) {
 780                 DEBUG(1, ("NO sig size available for this mech\n"));
 781                 return 0;
 782         }
 783
 784         maj_stat = gsskrb5_wrap_size(&min_stat,
 785                                      gensec_gssapi_state->gssapi_context,
 786                                      gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 787                                      GSS_C_QOP_DEFAULT,
 788                                      data_size,
 789                                      &output_size);
 790         if (GSS_ERROR(maj_stat)) {
 791                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 792                 DEBUG(1, ("gensec_gssapi_seal_packet: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 793                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 794                 talloc_free(mem_ctx);
 795                 return 0;
 796         }
 797
 798         if (output_size < data_size) {
 799                 return 0;
 800         }
 801
 802         /* The difference between the max output and the max input must be the signature */
 803         return output_size - data_size;
 804 }
 805
 806 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 807                                           TALLOC_CTX *mem_ctx,
 808                                           uint8_t *data, size_t length,
 809                                           const uint8_t *whole_pdu, size_t pdu_length,
 810                                           DATA_BLOB *sig)
 811 {
 812         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 813         OM_uint32 maj_stat, min_stat;
 814         gss_buffer_desc input_token, output_token;
 815         int conf_state;
 816         ssize_t sig_length;
 817
 818         input_token.length = length;
 819         input_token.value = data;
 820
 821         maj_stat = gss_wrap(&min_stat,
 822                             gensec_gssapi_state->gssapi_context,
 823                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 824                             GSS_C_QOP_DEFAULT,
 825                             &input_token,
 826                             &conf_state,
 827                             &output_token);
 828         if (GSS_ERROR(maj_stat)) {
 829                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
 830                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 831                 return NT_STATUS_ACCESS_DENIED;
 832         }
 833
 834         sig_length = gensec_gssapi_sig_size(gensec_security, length);
 835
 836         /* Caller must pad to right boundary */
 837         if (output_token.length != (length + sig_length)) {
 838                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] does not match caller length [%ld] plus sig size [%ld] = [%ld]\n",
 839                           (long)output_token.length, (long)length, (long)sig_length, (long)(length + sig_length)));
 840                 return NT_STATUS_INTERNAL_ERROR;
 841         }
 842
 843         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
 844         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
 845
 846         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 847         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
 848         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
 849
 850         gss_release_buffer(&min_stat, &output_token);
 851
 852         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 853             && !conf_state) {
 854                 return NT_STATUS_ACCESS_DENIED;
 855         }
 856         return NT_STATUS_OK;
 857 }
 858
 859 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
 860                                             TALLOC_CTX *mem_ctx,
 861                                             uint8_t *data, size_t length,
 862                                             const uint8_t *whole_pdu, size_t pdu_length,
 863                                             const DATA_BLOB *sig)
 864 {
 865         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 866         OM_uint32 maj_stat, min_stat;
 867         gss_buffer_desc input_token, output_token;
 868         int conf_state;
 869         gss_qop_t qop_state;
 870         DATA_BLOB in;
 871
 872         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
 873
 874         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
 875
 876         memcpy(in.data, sig->data, sig->length);
 877         memcpy(in.data + sig->length, data, length);
 878
 879         input_token.length = in.length;
 880         input_token.value = in.data;
 881
 882         maj_stat = gss_unwrap(&min_stat,
 883                               gensec_gssapi_state->gssapi_context,
 884                               &input_token,
 885                               &output_token,
 886                               &conf_state,
 887                               &qop_state);
 888         if (GSS_ERROR(maj_stat)) {
 889                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
 890                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 891                 return NT_STATUS_ACCESS_DENIED;
 892         }
 893
 894         if (output_token.length != length) {
 895                 return NT_STATUS_INTERNAL_ERROR;
 896         }
 897
 898         memcpy(data, output_token.value, length);
 899
 900         gss_release_buffer(&min_stat, &output_token);
 901
 902         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 903             && !conf_state) {
 904                 return NT_STATUS_ACCESS_DENIED;
 905         }
 906         return NT_STATUS_OK;
 907 }
 908
 909 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
 910                                           TALLOC_CTX *mem_ctx,
 911                                           const uint8_t *data, size_t length,
 912                                           const uint8_t *whole_pdu, size_t pdu_length,
 913                                           DATA_BLOB *sig)
 914 {
 915         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 916         OM_uint32 maj_stat, min_stat;
 917         gss_buffer_desc input_token, output_token;
 918         int conf_state;
 919         ssize_t sig_length = 0;
 920
 921         input_token.length = length;
 922         input_token.value = discard_const_p(uint8_t *, data);
 923
 924         maj_stat = gss_wrap(&min_stat,
 925                             gensec_gssapi_state->gssapi_context,
 926                             0,
 927                             GSS_C_QOP_DEFAULT,
 928                             &input_token,
 929                             &conf_state,
 930                             &output_token);
 931         if (GSS_ERROR(maj_stat)) {
 932                 DEBUG(1, ("GSS Wrap failed: %s\n",
 933                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 934                 return NT_STATUS_ACCESS_DENIED;
 935         }
 936
 937         if (output_token.length < length) {
 938                 return NT_STATUS_INTERNAL_ERROR;
 939         }
 940
 941         sig_length = gensec_gssapi_sig_size(gensec_security, length);
 942
 943         /* Caller must pad to right boundary */
 944         if (output_token.length != (length + sig_length)) {
 945                 DEBUG(1, ("gensec_gssapi_sign_packet: GSS Wrap length [%ld] does not match caller length [%ld] plus sig size [%ld] = [%ld]\n",
 946                           (long)output_token.length, (long)length, (long)sig_length, (long)(length + sig_length)));
 947                 return NT_STATUS_INTERNAL_ERROR;
 948         }
 949
 950         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
 951
 952         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 953
 954         gss_release_buffer(&min_stat, &output_token);
 955
 956         return NT_STATUS_OK;
 957 }
 958
 959 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
 960                                            TALLOC_CTX *mem_ctx,
 961                                            const uint8_t *data, size_t length,
 962                                            const uint8_t *whole_pdu, size_t pdu_length,
 963                                            const DATA_BLOB *sig)
 964 {
 965         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 966         OM_uint32 maj_stat, min_stat;
 967         gss_buffer_desc input_token, output_token;
 968         int conf_state;
 969         gss_qop_t qop_state;
 970         DATA_BLOB in;
 971
 972         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 973
 974         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
 975
 976         memcpy(in.data, sig->data, sig->length);
 977         memcpy(in.data + sig->length, data, length);
 978
 979         input_token.length = in.length;
 980         input_token.value = in.data;
 981
 982         maj_stat = gss_unwrap(&min_stat,
 983                               gensec_gssapi_state->gssapi_context,
 984                               &input_token,
 985                               &output_token,
 986                               &conf_state,
 987                               &qop_state);
 988         if (GSS_ERROR(maj_stat)) {
 989                 DEBUG(1, ("GSS UnWrap failed: %s\n",
 990                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 991                 return NT_STATUS_ACCESS_DENIED;
 992         }
 993
 994         if (output_token.length != length) {
 995                 return NT_STATUS_INTERNAL_ERROR;
 996         }
 997
 998         gss_release_buffer(&min_stat, &output_token);
 999
1000         return NT_STATUS_OK;
1001 }
1002
1003 /* Try to figure out what features we actually got on the connection */
1004 static BOOL gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1005                                        uint32_t feature)
1006 {
1007         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
1008         if (feature & GENSEC_FEATURE_SIGN) {
1009                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1010                 if (gensec_gssapi_state->sasl
1011                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1012                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1013                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1014                 }
1015                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1016         }
1017         if (feature & GENSEC_FEATURE_SEAL) {
1018                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1019                 if (gensec_gssapi_state->sasl
1020                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1021                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1022                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1023                 }
1024                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1025         }
1026         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1027                 /* Only for GSSAPI/Krb5 */
1028                 if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
1029                     && (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements, gensec_gssapi_state->gss_oid->length) == 0)) {
1030                         return True;
1031                 }
1032         }
1033         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1034                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1035         }
1036         /* We can always do async (rather than strict request/reply) packets.  */
1037         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1038                 return True;
1039         }
1040         return False;
1041 }
1042
1043 /*
1044  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1045  * (for encrypting some passwords).
1046  *
1047  * This breaks all the abstractions, but what do you expect...
1048  */
1049 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1050                                           DATA_BLOB *session_key)
1051 {
1052         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
1053
1054         if (gensec_gssapi_state->session_key.data) {
1055                 *session_key = gensec_gssapi_state->session_key;
1056                 return NT_STATUS_OK;
1057         }
1058
1059         /* Ensure we only call this for GSSAPI/krb5, otherwise things
1060          * could get very ugly */
1061         if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
1062             && (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1063                        gensec_gssapi_state->gss_oid->length) == 0)) {
1064                 OM_uint32 maj_stat, min_stat;
1065                 gss_buffer_desc skey;
1066
1067                 maj_stat = gsskrb5_get_initiator_subkey(&min_stat,
1068                                                         gensec_gssapi_state->gssapi_context,
1069                                                         &skey);
1070
1071                 if (maj_stat == 0) {
1072                         DEBUG(10, ("Got KRB5 session key of length %d\n",
1073                                    (int)skey.length));
1074                         gensec_gssapi_state->session_key = data_blob_talloc(gensec_gssapi_state,
1075                                                                             skey.value, skey.length);
1076                         *session_key = gensec_gssapi_state->session_key;
1077                         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1078
1079                         gss_release_buffer(&min_stat, &skey);
1080                         return NT_STATUS_OK;
1081                 }
1082                 return NT_STATUS_NO_USER_SESSION_KEY;
1083         }
1084
1085         DEBUG(1, ("NO session key for this mech\n"));
1086         return NT_STATUS_NO_USER_SESSION_KEY;
1087 }
1088
1089
1090 /* Get some basic (and authorization) information about the user on
1091  * this session.  This uses either the PAC (if present) or a local
1092  * database lookup */
1093 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1094                                            struct auth_session_info **_session_info)
1095 {
1096         NTSTATUS nt_status;
1097         TALLOC_CTX *mem_ctx;
1098         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
1099         struct auth_serversupplied_info *server_info = NULL;
1100         struct auth_session_info *session_info = NULL;
1101         struct PAC_LOGON_INFO *logon_info;
1102         OM_uint32 maj_stat, min_stat;
1103         gss_buffer_desc name_token;
1104         gss_buffer_desc pac;
1105         krb5_keyblock *keyblock;
1106         time_t authtime;
1107         krb5_principal principal;
1108         char *principal_string;
1109         DATA_BLOB pac_blob;
1110
1111         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1112             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1113                        gensec_gssapi_state->gss_oid->length) != 0)) {
1114                 DEBUG(1, ("NO session info available for this mech\n"));
1115                 return NT_STATUS_INVALID_PARAMETER;
1116         }
1117
1118         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1119         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1120
1121         maj_stat = gss_display_name (&min_stat,
1122                                      gensec_gssapi_state->client_name,
1123                                      &name_token,
1124                                      NULL);
1125         if (maj_stat) {
1126                 talloc_free(mem_ctx);
1127                 return NT_STATUS_FOOBAR;
1128         }
1129
1130         principal_string = talloc_strndup(mem_ctx, name_token.value, name_token.length);
1131
1132         gss_release_buffer(&min_stat, &name_token);
1133
1134         if (!principal_string) {
1135                 talloc_free(mem_ctx);
1136                 return NT_STATUS_NO_MEMORY;
1137         }
1138
1139         maj_stat = gss_krb5_copy_service_keyblock(&min_stat,
1140                                                   gensec_gssapi_state->gssapi_context,
1141                                                   &keyblock);
1142
1143         if (maj_stat == 0) {
1144                 maj_stat = gsskrb5_extract_authtime_from_sec_context(&min_stat,
1145                                                                      gensec_gssapi_state->gssapi_context,
1146                                                                      &authtime);
1147         }
1148
1149         if (maj_stat == 0) {
1150                 maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1151                                                                        gensec_gssapi_state->gssapi_context,
1152                                                                        KRB5_AUTHDATA_WIN2K_PAC,
1153                                                                        &pac);
1154         }
1155
1156         if (maj_stat == 0) {
1157                 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1158                 gss_release_buffer(&min_stat, &pac);
1159         }
1160
1161         /* IF we have the PAC - otherwise we need to get this
1162          * data from elsewere - local ldb, or (TODO) lookup of some
1163          * kind...
1164          */
1165         if (maj_stat == 0) {
1166                 krb5_error_code ret;
1167
1168                 ret = krb5_parse_name(gensec_gssapi_state->smb_krb5_context->krb5_context,
1169                                       principal_string, &principal);
1170                 if (ret) {
1171                         talloc_free(mem_ctx);
1172                         return NT_STATUS_INVALID_PARAMETER;
1173                 }
1174
1175                 /* decode and verify the pac */
1176                 nt_status = kerberos_pac_logon_info(mem_ctx, &logon_info, pac_blob,
1177                                                     gensec_gssapi_state->smb_krb5_context->krb5_context,
1178                                                     NULL, keyblock, principal, authtime, NULL);
1179                 krb5_free_principal(gensec_gssapi_state->smb_krb5_context->krb5_context, principal);
1180
1181                 if (NT_STATUS_IS_OK(nt_status)) {
1182                         union netr_Validation validation;
1183                         validation.sam3 = &logon_info->info3;
1184                         nt_status = make_server_info_netlogon_validation(gensec_gssapi_state,
1185                                                                          NULL,
1186                                                                          3, &validation,
1187                                                                          &server_info);
1188                         if (!NT_STATUS_IS_OK(nt_status)) {
1189                                 talloc_free(mem_ctx);
1190                                 return nt_status;
1191                         }
1192                 } else {
1193                         maj_stat = 1;
1194                 }
1195         }
1196
1197         if (maj_stat) {
1198                 DEBUG(1, ("Unable to use PAC, resorting to local user lookup!\n"));
1199                 nt_status = sam_get_server_info_principal(mem_ctx, principal_string,
1200                                                           &server_info);
1201
1202                 if (!NT_STATUS_IS_OK(nt_status)) {
1203                         talloc_free(mem_ctx);
1204                         return nt_status;
1205                 }
1206         }
1207
1208         /* references the server_info into the session_info */
1209         nt_status = auth_generate_session_info(mem_ctx, server_info, &session_info);
1210         if (!NT_STATUS_IS_OK(nt_status)) {
1211                 talloc_free(mem_ctx);
1212                 return nt_status;
1213         }
1214
1215         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1216         if (!NT_STATUS_IS_OK(nt_status)) {
1217                 talloc_free(mem_ctx);
1218                 return nt_status;
1219         }
1220
1221         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1222                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1223         } else {
1224                 krb5_error_code ret;
1225                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1226                 session_info->credentials = cli_credentials_init(session_info);
1227                 if (!session_info->credentials) {
1228                         talloc_free(mem_ctx);
1229                         return NT_STATUS_NO_MEMORY;
1230                 }
1231
1232                 cli_credentials_set_conf(session_info->credentials);
1233
1234                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1235                                                            gensec_gssapi_state->delegated_cred_handle,
1236                                                            CRED_SPECIFIED);
1237                 if (ret) {
1238                         talloc_free(mem_ctx);
1239                         return NT_STATUS_NO_MEMORY;
1240                 }
1241                 /* It has been taken from this place... */
1242                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1243         }
1244         talloc_steal(gensec_gssapi_state, session_info);
1245         talloc_free(mem_ctx);
1246         *_session_info = session_info;
1247
1248         return NT_STATUS_OK;
1249 }
1250
1251 static const char *gensec_gssapi_krb5_oids[] = {
1252         GENSEC_OID_KERBEROS5,
1253         GENSEC_OID_KERBEROS5_OLD,
1254         NULL
1255 };
1256
1257 /* As a server, this could in theory accept any GSSAPI mech */
1258 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1259         .name           = "gssapi_krb5",
1260         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1261         .oid            = gensec_gssapi_krb5_oids,
1262         .client_start   = gensec_gssapi_client_start,
1263         .server_start   = gensec_gssapi_server_start,
1264         .magic          = gensec_gssapi_magic,
1265         .update         = gensec_gssapi_update,
1266         .session_key    = gensec_gssapi_session_key,
1267         .session_info   = gensec_gssapi_session_info,
1268         .sig_size       = gensec_gssapi_sig_size,
1269         .sign_packet    = gensec_gssapi_sign_packet,
1270         .check_packet   = gensec_gssapi_check_packet,
1271         .seal_packet    = gensec_gssapi_seal_packet,
1272         .unseal_packet  = gensec_gssapi_unseal_packet,
1273         .wrap           = gensec_gssapi_wrap,
1274         .unwrap         = gensec_gssapi_unwrap,
1275         .have_feature   = gensec_gssapi_have_feature,
1276         .enabled        = True,
1277         .kerberos       = True
1278 };
1279
1280 /* As a server, this could in theory accept any GSSAPI mech */
1281 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1282         .name           = "gssapi_krb5_sasl",
1283         .sasl_name      = "GSSAPI",
1284         .client_start   = gensec_gssapi_sasl_client_start,
1285         .server_start   = gensec_gssapi_sasl_server_start,
1286         .update         = gensec_gssapi_update,
1287         .session_key    = gensec_gssapi_session_key,
1288         .session_info   = gensec_gssapi_session_info,
1289         .wrap           = gensec_gssapi_wrap,
1290         .unwrap         = gensec_gssapi_unwrap,
1291         .have_feature   = gensec_gssapi_have_feature,
1292         .enabled        = True,
1293         .kerberos       = True
1294 };
1295
1296 NTSTATUS gensec_gssapi_init(void)
1297 {
1298         NTSTATUS ret;
1299
1300         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1301         if (!NT_STATUS_IS_OK(ret)) {
1302                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1303                         gensec_gssapi_krb5_security_ops.name));
1304                 return ret;
1305         }
1306
1307         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1308         if (!NT_STATUS_IS_OK(ret)) {
1309                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1310                         gensec_gssapi_sasl_krb5_security_ops.name));
1311                 return ret;
1312         }
1313
1314         return ret;
1315 }