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(struct gensec_gssapi_state *gensec_gssapi_state)
  99 {
 100         OM_uint32 maj_stat, min_stat;
 101
 102         if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
 103                 maj_stat = gss_release_cred(&min_stat,
 104                                             &gensec_gssapi_state->delegated_cred_handle);
 105         }
 106
 107         if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
 108                 maj_stat = gss_delete_sec_context (&min_stat,
 109                                                    &gensec_gssapi_state->gssapi_context,
 110                                                    GSS_C_NO_BUFFER);
 111         }
 112
 113         if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
 114                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
 115         }
 116         if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
 117                 maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
 118         }
 119         return 0;
 120 }
 121
 122 static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
 123 {
 124         struct gensec_gssapi_state *gensec_gssapi_state;
 125         krb5_error_code ret;
 126
 127         gensec_gssapi_state = talloc(gensec_security, struct gensec_gssapi_state);
 128         if (!gensec_gssapi_state) {
 129                 return NT_STATUS_NO_MEMORY;
 130         }
 131
 132         gensec_gssapi_state->sasl = False;
 133         gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
 134
 135         gensec_security->private_data = gensec_gssapi_state;
 136
 137         gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
 138         gensec_gssapi_state->server_name = GSS_C_NO_NAME;
 139         gensec_gssapi_state->client_name = GSS_C_NO_NAME;
 140
 141         /* TODO: Fill in channel bindings */
 142         gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
 143
 144         gensec_gssapi_state->want_flags = 0;
 145         if (lp_parm_bool(-1, "gensec_gssapi", "mutual", True)) {
 146                 gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
 147         }
 148         if (lp_parm_bool(-1, "gensec_gssapi", "delegation", True)) {
 149                 gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
 150         }
 151         if (lp_parm_bool(-1, "gensec_gssapi", "sequence", True)) {
 152                 gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
 153         }
 154
 155         gensec_gssapi_state->got_flags = 0;
 156
 157         gensec_gssapi_state->session_key = data_blob(NULL, 0);
 158         gensec_gssapi_state->pac = data_blob(NULL, 0);
 159
 160         gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
 161
 162         talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destory);
 163
 164         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 165                 gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
 166         }
 167         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 168                 gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
 169         }
 170         if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
 171                 gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
 172         }
 173
 174         gensec_gssapi_state->gss_oid = gss_mech_krb5;
 175
 176         ret = smb_krb5_init_context(gensec_gssapi_state,
 177                                     &gensec_gssapi_state->smb_krb5_context);
 178         if (ret) {
 179                 DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
 180                          error_message(ret)));
 181                 return NT_STATUS_INTERNAL_ERROR;
 182         }
 183         return NT_STATUS_OK;
 184 }
 185
 186 static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
 187 {
 188         NTSTATUS nt_status;
 189         int ret;
 190         struct gensec_gssapi_state *gensec_gssapi_state;
 191         struct cli_credentials *machine_account;
 192         struct gssapi_creds_container *gcc;
 193
 194         nt_status = gensec_gssapi_start(gensec_security);
 195         if (!NT_STATUS_IS_OK(nt_status)) {
 196                 return nt_status;
 197         }
 198
 199         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 200
 201         machine_account = gensec_get_credentials(gensec_security);
 202
 203         if (!machine_account) {
 204                 DEBUG(3, ("No machine account credentials specified\n"));
 205                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 206         } else {
 207                 ret = cli_credentials_get_server_gss_creds(machine_account, &gcc);
 208                 if (ret) {
 209                         DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
 210                                   error_message(ret)));
 211                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 212                 }
 213         }
 214
 215         gensec_gssapi_state->server_cred = gcc;
 216         return NT_STATUS_OK;
 217
 218 }
 219
 220 static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
 221 {
 222         NTSTATUS nt_status;
 223         struct gensec_gssapi_state *gensec_gssapi_state;
 224         nt_status = gensec_gssapi_server_start(gensec_security);
 225
 226         if (NT_STATUS_IS_OK(nt_status)) {
 227                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 228                 gensec_gssapi_state->sasl = True;
 229         }
 230         return nt_status;
 231 }
 232
 233 static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
 234 {
 235         struct gensec_gssapi_state *gensec_gssapi_state;
 236         struct cli_credentials *creds = gensec_get_credentials(gensec_security);
 237         krb5_error_code ret;
 238         NTSTATUS nt_status;
 239         gss_buffer_desc name_token;
 240         gss_OID name_type;
 241         OM_uint32 maj_stat, min_stat;
 242         const char *hostname = gensec_get_target_hostname(gensec_security);
 243         const char *principal;
 244         struct gssapi_creds_container *gcc;
 245
 246         if (!hostname) {
 247                 DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
 248                 return NT_STATUS_INVALID_PARAMETER;
 249         }
 250         if (is_ipaddress(hostname)) {
 251                 DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
 252                 return NT_STATUS_INVALID_PARAMETER;
 253         }
 254         if (strcmp(hostname, "localhost") == 0) {
 255                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 256                 return NT_STATUS_INVALID_PARAMETER;
 257         }
 258
 259         if (((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 260              || (gensec_security->want_features & GENSEC_FEATURE_SEAL))
 261             && (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE)
 262             && !lp_parm_bool(-1, "gensec_gssapi", "dce_signseal",
 263                              cli_credentials_get_kerberos_state(creds) == CRED_MUST_USE_KERBEROS)) {
 264                 DEBUG(2, ("GSSAPI sign/seal disabled for DCE/RPC. "));
 265                 return NT_STATUS_INVALID_PARAMETER;
 266         }
 267
 268         nt_status = gensec_gssapi_start(gensec_security);
 269         if (!NT_STATUS_IS_OK(nt_status)) {
 270                 return nt_status;
 271         }
 272
 273         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 274
 275         principal = gensec_get_target_principal(gensec_security);
 276         if (principal && lp_client_use_spnego_principal()) {
 277                 name_token.value  = discard_const_p(uint8_t, principal);
 278                 name_token.length = strlen(principal);
 279
 280                 name_type = GSS_C_NULL_OID;
 281         } else {
 282                 principal = talloc_asprintf(gensec_gssapi_state, "%s@%s",
 283                                             gensec_get_target_service(gensec_security),
 284                                             hostname);
 285
 286                 name_token.value  = discard_const_p(uint8_t, principal);
 287                 name_token.length = strlen(principal);
 288
 289                 name_type = GSS_C_NT_HOSTBASED_SERVICE;
 290         }
 291
 292         maj_stat = gss_import_name (&min_stat,
 293                                     &name_token,
 294                                     name_type,
 295                                     &gensec_gssapi_state->server_name);
 296         if (maj_stat) {
 297                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 298                           (char *)name_token.value,
 299                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
 300                 return NT_STATUS_INVALID_PARAMETER;
 301         }
 302
 303         ret = cli_credentials_get_client_gss_creds(creds, &gcc);
 304         switch (ret) {
 305         case 0:
 306                 break;
 307         case KRB5_KDC_UNREACH:
 308                 DEBUG(3, ("Cannot reach a KDC we require\n"));
 309                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 310         default:
 311                 DEBUG(1, ("Aquiring initiator credentails failed\n"));
 312                 return NT_STATUS_UNSUCCESSFUL;
 313         }
 314
 315         gensec_gssapi_state->client_cred = gcc;
 316
 317         return NT_STATUS_OK;
 318 }
 319
 320 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 321 {
 322         NTSTATUS nt_status;
 323         struct gensec_gssapi_state *gensec_gssapi_state;
 324         nt_status = gensec_gssapi_client_start(gensec_security);
 325
 326         if (NT_STATUS_IS_OK(nt_status)) {
 327                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 328                 gensec_gssapi_state->sasl = True;
 329         }
 330         return nt_status;
 331 }
 332
 333
 334 /**
 335  * Check if the packet is one for this mechansim
 336  *
 337  * @param gensec_security GENSEC state
 338  * @param in The request, as a DATA_BLOB
 339  * @return Error, INVALID_PARAMETER if it's not a packet for us
 340  *                or NT_STATUS_OK if the packet is ok.
 341  */
 342
 343 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 344                                     const DATA_BLOB *in)
 345 {
 346         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 347                 return NT_STATUS_OK;
 348         } else {
 349                 return NT_STATUS_INVALID_PARAMETER;
 350         }
 351 }
 352
 353
 354 /**
 355  * Next state function for the GSSAPI GENSEC mechanism
 356  *
 357  * @param gensec_gssapi_state GSSAPI State
 358  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 359  * @param in The request, as a DATA_BLOB
 360  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 361  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 362  *                or NT_STATUS_OK if the user is authenticated.
 363  */
 364
 365 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 366                                    TALLOC_CTX *out_mem_ctx,
 367                                    const DATA_BLOB in, DATA_BLOB *out)
 368 {
 369         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 370         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 371         OM_uint32 maj_stat, min_stat;
 372         OM_uint32 min_stat2;
 373         gss_buffer_desc input_token, output_token;
 374         gss_OID gss_oid_p;
 375         input_token.length = in.length;
 376         input_token.value = in.data;
 377
 378         switch (gensec_gssapi_state->sasl_state) {
 379         case STAGE_GSS_NEG:
 380         {
 381                 switch (gensec_security->gensec_role) {
 382                 case GENSEC_CLIENT:
 383                 {
 384                         maj_stat = gss_init_sec_context(&min_stat,
 385                                                         gensec_gssapi_state->client_cred->creds,
 386                                                         &gensec_gssapi_state->gssapi_context,
 387                                                         gensec_gssapi_state->server_name,
 388                                                         discard_const_p(gss_OID_desc, gensec_gssapi_state->gss_oid),
 389                                                         gensec_gssapi_state->want_flags,
 390                                                         0,
 391                                                         gensec_gssapi_state->input_chan_bindings,
 392                                                         &input_token,
 393                                                         NULL,
 394                                                         &output_token,
 395                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 396                                                         NULL);
 397                         break;
 398                 }
 399                 case GENSEC_SERVER:
 400                 {
 401                         maj_stat = gss_accept_sec_context(&min_stat,
 402                                                           &gensec_gssapi_state->gssapi_context,
 403                                                           gensec_gssapi_state->server_cred->creds,
 404                                                           &input_token,
 405                                                           gensec_gssapi_state->input_chan_bindings,
 406                                                           &gensec_gssapi_state->client_name,
 407                                                           &gss_oid_p,
 408                                                           &output_token,
 409                                                           &gensec_gssapi_state->got_flags,
 410                                                           NULL,
 411                                                           &gensec_gssapi_state->delegated_cred_handle);
 412                         gensec_gssapi_state->gss_oid = gss_oid_p;
 413                         break;
 414                 }
 415                 default:
 416                         return NT_STATUS_INVALID_PARAMETER;
 417
 418                 }
 419
 420                 if (maj_stat == GSS_S_COMPLETE) {
 421                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 422                         gss_release_buffer(&min_stat2, &output_token);
 423
 424                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 425                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 426                         } else {
 427                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 428                         }
 429
 430                         /* We may have been invoked as SASL, so there
 431                          * is more work to do */
 432                         if (gensec_gssapi_state->sasl) {
 433                                 /* Due to a very subtle interaction
 434                                  * with SASL and the LDAP libs, we
 435                                  * must ensure the data pointer is
 436                                  * != NULL, but the length is 0.
 437                                  *
 438                                  * This ensures we send a 'zero
 439                                  * length' (rather than NULL) response
 440                                  */
 441
 442                                 if (!out->data) {
 443                                         out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
 444                                 }
 445
 446                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 447                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 448                         } else {
 449                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 450
 451                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 452                                         DEBUG(5, ("GSSAPI Connection will be cryptographicly sealed\n"));
 453                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 454                                         DEBUG(5, ("GSSAPI Connection will be cryptographicly signed\n"));
 455                                 } else {
 456                                         DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
 457                                 }
 458
 459                                 return NT_STATUS_OK;
 460                         }
 461                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 462                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 463                         gss_release_buffer(&min_stat2, &output_token);
 464
 465                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 466                 } else if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
 467                            && (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
 468                                       gensec_gssapi_state->gss_oid->length) == 0)) {
 469                         switch (min_stat) {
 470                         case KRB5_KDC_UNREACH:
 471                                 DEBUG(3, ("Cannot reach a KDC we require: %s\n",
 472                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
 473                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 474                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 475                                 DEBUG(3, ("Server is not registered with our KDC: %s\n",
 476                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
 477                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 478                         case KRB5KRB_AP_ERR_MSG_TYPE:
 479                                 /* garbage input, possibly from the auto-mech detection */
 480                                 return NT_STATUS_INVALID_PARAMETER;
 481                         default:
 482                                 DEBUG(1, ("GSS(krb5) Update failed: %s\n",
 483                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 484                                 return nt_status;
 485                         }
 486                 } else {
 487                         DEBUG(1, ("GSS Update failed: %s\n",
 488                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 489                         return nt_status;
 490                 }
 491                 break;
 492         }
 493         /* These last two stages are only done if we were invoked as SASL */
 494         case STAGE_SASL_SSF_NEG:
 495         {
 496                 switch (gensec_security->gensec_role) {
 497                 case GENSEC_CLIENT:
 498                 {
 499                         uint8_t maxlength_proposed[4];
 500                         uint8_t security_supported;
 501                         int conf_state;
 502                         gss_qop_t qop_state;
 503                         input_token.length = in.length;
 504                         input_token.value = in.data;
 505
 506                         maj_stat = gss_unwrap(&min_stat,
 507                                               gensec_gssapi_state->gssapi_context,
 508                                               &input_token,
 509                                               &output_token,
 510                                               &conf_state,
 511                                               &qop_state);
 512                         if (GSS_ERROR(maj_stat)) {
 513                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 514                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 515                                 return NT_STATUS_ACCESS_DENIED;
 516                         }
 517
 518                         if (output_token.length < 4) {
 519                                 return NT_STATUS_INVALID_PARAMETER;
 520                         }
 521
 522                         memcpy(maxlength_proposed, output_token.value, 4);
 523                         gss_release_buffer(&min_stat, &output_token);
 524
 525                         /* first byte is the proposed security */
 526                         security_supported = maxlength_proposed[0];
 527                         maxlength_proposed[0] = '\0';
 528                         gensec_gssapi_state->sasl_protection = 0;
 529                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 530                                 if (security_supported & NEG_SEAL) {
 531                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 532                                 }
 533                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 534                                 if (security_supported & NEG_SIGN) {
 535                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 536                                 }
 537                         } else if (security_supported & NEG_NONE) {
 538                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 539                         } else {
 540                                 DEBUG(1, ("Remote server does not support unprotected connections"));
 541                                 return NT_STATUS_ACCESS_DENIED;
 542                         }
 543
 544                         /* We just accept their max length, and send
 545                          * it back with the SASL flags */
 546                         maxlength_proposed[0] = gensec_gssapi_state->sasl_protection;
 547
 548                         input_token.value = maxlength_proposed;
 549                         input_token.length = sizeof(maxlength_proposed);
 550
 551                         maj_stat = gss_wrap(&min_stat,
 552                                             gensec_gssapi_state->gssapi_context,
 553                                             False,
 554                                             GSS_C_QOP_DEFAULT,
 555                                             &input_token,
 556                                             &conf_state,
 557                                             &output_token);
 558                         if (GSS_ERROR(maj_stat)) {
 559                                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 560                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 561                                 return NT_STATUS_ACCESS_DENIED;
 562                         }
 563
 564                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 565                         gss_release_buffer(&min_stat, &output_token);
 566
 567                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 568                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 569
 570                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 571                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
 572                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 573                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
 574                         } else {
 575                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
 576                         }
 577
 578                         return NT_STATUS_OK;
 579                 }
 580                 case GENSEC_SERVER:
 581                 {
 582                         uint8_t maxlength_proposed[4];
 583                         uint8_t security_supported = 0x0;
 584                         int conf_state;
 585
 586                         /* TODO: Need some better ideas for this */
 587                         RSIVAL(maxlength_proposed, 0, 0xFFFFFF);
 588                         /* first byte is the proposed security */
 589                         maxlength_proposed[0] = '\0';
 590
 591                         gensec_gssapi_state->sasl_protection = 0;
 592                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 593                                 security_supported |= NEG_SEAL;
 594                         }
 595                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 596                                 security_supported |= NEG_SIGN;
 597                         }
 598                         if (security_supported == 0) {
 599                                 /* If we don't support anything, this must be 0 */
 600                                 RSIVAL(maxlength_proposed, 0, 0x0);
 601                         }
 602
 603                         /* TODO:  We may not wish to support this */
 604                         security_supported |= NEG_NONE;
 605
 606                         /* Ignore 'in' */
 607                         maxlength_proposed[0] = security_supported;
 608
 609                         input_token.value = maxlength_proposed;
 610                         input_token.length = sizeof(maxlength_proposed);
 611
 612                         maj_stat = gss_wrap(&min_stat,
 613                                             gensec_gssapi_state->gssapi_context,
 614                                             False,
 615                                             GSS_C_QOP_DEFAULT,
 616                                             &input_token,
 617                                             &conf_state,
 618                                             &output_token);
 619                         if (GSS_ERROR(maj_stat)) {
 620                                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 621                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 622                                 return NT_STATUS_ACCESS_DENIED;
 623                         }
 624
 625                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 626                         gss_release_buffer(&min_stat, &output_token);
 627
 628                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 629                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 630                 }
 631                 default:
 632                         return NT_STATUS_INVALID_PARAMETER;
 633
 634                 }
 635         }
 636         /* This is s server-only stage */
 637         case STAGE_SASL_SSF_ACCEPT:
 638         {
 639                 uint8_t maxlength_proposed[4];
 640                 uint8_t security_proposed;
 641                 int conf_state;
 642                 gss_qop_t qop_state;
 643                 input_token.length = in.length;
 644                 input_token.value = in.data;
 645
 646                 maj_stat = gss_unwrap(&min_stat,
 647                                       gensec_gssapi_state->gssapi_context,
 648                                       &input_token,
 649                                       &output_token,
 650                                       &conf_state,
 651                                       &qop_state);
 652                 if (GSS_ERROR(maj_stat)) {
 653                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 654                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 655                         return NT_STATUS_ACCESS_DENIED;
 656                 }
 657
 658                 if (output_token.length < 4) {
 659                         return NT_STATUS_INVALID_PARAMETER;
 660                 }
 661
 662                 memcpy(maxlength_proposed, output_token.value, 4);
 663                 gss_release_buffer(&min_stat, &output_token);
 664
 665                 /* first byte is the proposed security */
 666                 /* TODO: We should do something with the rest, but for now... */
 667                 security_proposed = maxlength_proposed[0];
 668
 669                 maxlength_proposed[0] = 0x0;
 670                 gensec_gssapi_state->sasl_protection = 0;
 671                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 672                         if (security_proposed & NEG_SEAL) {
 673                                 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 674                         }
 675                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 676                         if (security_proposed & NEG_SIGN) {
 677                                 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 678                         }
 679                 } else if (security_proposed & NEG_NONE) {
 680                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 681                 } else {
 682                         DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
 683                         return NT_STATUS_ACCESS_DENIED;
 684                 }
 685
 686                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 687                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 688                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 689                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
 690                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 691                         DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
 692                 } else {
 693                         DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
 694                 }
 695
 696                 *out = data_blob(NULL, 0);
 697                 return NT_STATUS_OK;
 698         }
 699         default:
 700                 return NT_STATUS_INVALID_PARAMETER;
 701         }
 702 }
 703
 704 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 705                                    TALLOC_CTX *mem_ctx,
 706                                    const DATA_BLOB *in,
 707                                    DATA_BLOB *out)
 708 {
 709         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 710         OM_uint32 maj_stat, min_stat;
 711         gss_buffer_desc input_token, output_token;
 712         int conf_state;
 713         input_token.length = in->length;
 714         input_token.value = in->data;
 715
 716         maj_stat = gss_wrap(&min_stat,
 717                             gensec_gssapi_state->gssapi_context,
 718                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 719                             GSS_C_QOP_DEFAULT,
 720                             &input_token,
 721                             &conf_state,
 722                             &output_token);
 723         if (GSS_ERROR(maj_stat)) {
 724                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 725                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 726                 return NT_STATUS_ACCESS_DENIED;
 727         }
 728
 729         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 730         gss_release_buffer(&min_stat, &output_token);
 731
 732         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 733             && !conf_state) {
 734                 return NT_STATUS_ACCESS_DENIED;
 735         }
 736         return NT_STATUS_OK;
 737 }
 738
 739 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 740                                      TALLOC_CTX *mem_ctx,
 741                                      const DATA_BLOB *in,
 742                                      DATA_BLOB *out)
 743 {
 744         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 745         OM_uint32 maj_stat, min_stat;
 746         gss_buffer_desc input_token, output_token;
 747         int conf_state;
 748         gss_qop_t qop_state;
 749         input_token.length = in->length;
 750         input_token.value = in->data;
 751
 752         maj_stat = gss_unwrap(&min_stat,
 753                               gensec_gssapi_state->gssapi_context,
 754                               &input_token,
 755                               &output_token,
 756                               &conf_state,
 757                               &qop_state);
 758         if (GSS_ERROR(maj_stat)) {
 759                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 760                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 761                 return NT_STATUS_ACCESS_DENIED;
 762         }
 763
 764         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 765         gss_release_buffer(&min_stat, &output_token);
 766
 767         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 768             && !conf_state) {
 769                 return NT_STATUS_ACCESS_DENIED;
 770         }
 771         return NT_STATUS_OK;
 772 }
 773
 774 /* Find out the size of the signature, assuming (incorrectly) that it
 775  * GSSAPI provides any guarantees as to it's size.
 776  *
 777  * This is needed by the DCE/RPC code, which uses AEAD
 778  * (signed headers, including signature legnth and a sealed body)
 779  */
 780 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
 781 {
 782         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 783         OM_uint32 maj_stat, min_stat;
 784         OM_uint32 output_size;
 785         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
 786             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
 787                        gensec_gssapi_state->gss_oid->length) != 0)) {
 788                 DEBUG(1, ("NO sig size available for this mech\n"));
 789                 return 0;
 790         }
 791
 792         maj_stat = gsskrb5_wrap_size(&min_stat,
 793                                      gensec_gssapi_state->gssapi_context,
 794                                      gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 795                                      GSS_C_QOP_DEFAULT,
 796                                      data_size,
 797                                      &output_size);
 798         if (GSS_ERROR(maj_stat)) {
 799                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 800                 DEBUG(1, ("gensec_gssapi_seal_packet: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 801                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 802                 talloc_free(mem_ctx);
 803                 return 0;
 804         }
 805
 806         if (output_size < data_size) {
 807                 return 0;
 808         }
 809
 810         /* The difference between the max output and the max input must be the signature */
 811         return output_size - data_size;
 812 }
 813
 814 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 815                                           TALLOC_CTX *mem_ctx,
 816                                           uint8_t *data, size_t length,
 817                                           const uint8_t *whole_pdu, size_t pdu_length,
 818                                           DATA_BLOB *sig)
 819 {
 820         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 821         OM_uint32 maj_stat, min_stat;
 822         gss_buffer_desc input_token, output_token;
 823         int conf_state;
 824         ssize_t sig_length;
 825
 826         input_token.length = length;
 827         input_token.value = data;
 828
 829         maj_stat = gss_wrap(&min_stat,
 830                             gensec_gssapi_state->gssapi_context,
 831                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 832                             GSS_C_QOP_DEFAULT,
 833                             &input_token,
 834                             &conf_state,
 835                             &output_token);
 836         if (GSS_ERROR(maj_stat)) {
 837                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
 838                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 839                 return NT_STATUS_ACCESS_DENIED;
 840         }
 841
 842         sig_length = gensec_gssapi_sig_size(gensec_security, length);
 843
 844         /* Caller must pad to right boundary */
 845         if (output_token.length != (length + sig_length)) {
 846                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] does not match caller length [%ld] plus sig size [%ld] = [%ld]\n",
 847                           (long)output_token.length, (long)length, (long)sig_length, (long)(length + sig_length)));
 848                 return NT_STATUS_INTERNAL_ERROR;
 849         }
 850
 851         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
 852         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
 853
 854         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 855         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
 856         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
 857
 858         gss_release_buffer(&min_stat, &output_token);
 859
 860         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 861             && !conf_state) {
 862                 return NT_STATUS_ACCESS_DENIED;
 863         }
 864         return NT_STATUS_OK;
 865 }
 866
 867 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
 868                                             TALLOC_CTX *mem_ctx,
 869                                             uint8_t *data, size_t length,
 870                                             const uint8_t *whole_pdu, size_t pdu_length,
 871                                             const DATA_BLOB *sig)
 872 {
 873         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 874         OM_uint32 maj_stat, min_stat;
 875         gss_buffer_desc input_token, output_token;
 876         int conf_state;
 877         gss_qop_t qop_state;
 878         DATA_BLOB in;
 879
 880         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
 881
 882         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
 883
 884         memcpy(in.data, sig->data, sig->length);
 885         memcpy(in.data + sig->length, data, length);
 886
 887         input_token.length = in.length;
 888         input_token.value = in.data;
 889
 890         maj_stat = gss_unwrap(&min_stat,
 891                               gensec_gssapi_state->gssapi_context,
 892                               &input_token,
 893                               &output_token,
 894                               &conf_state,
 895                               &qop_state);
 896         if (GSS_ERROR(maj_stat)) {
 897                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
 898                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 899                 return NT_STATUS_ACCESS_DENIED;
 900         }
 901
 902         if (output_token.length != length) {
 903                 return NT_STATUS_INTERNAL_ERROR;
 904         }
 905
 906         memcpy(data, output_token.value, length);
 907
 908         gss_release_buffer(&min_stat, &output_token);
 909
 910         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 911             && !conf_state) {
 912                 return NT_STATUS_ACCESS_DENIED;
 913         }
 914         return NT_STATUS_OK;
 915 }
 916
 917 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
 918                                           TALLOC_CTX *mem_ctx,
 919                                           const uint8_t *data, size_t length,
 920                                           const uint8_t *whole_pdu, size_t pdu_length,
 921                                           DATA_BLOB *sig)
 922 {
 923         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 924         OM_uint32 maj_stat, min_stat;
 925         gss_buffer_desc input_token, output_token;
 926         int conf_state;
 927         ssize_t sig_length = 0;
 928
 929         input_token.length = length;
 930         input_token.value = discard_const_p(uint8_t *, data);
 931
 932         maj_stat = gss_wrap(&min_stat,
 933                             gensec_gssapi_state->gssapi_context,
 934                             0,
 935                             GSS_C_QOP_DEFAULT,
 936                             &input_token,
 937                             &conf_state,
 938                             &output_token);
 939         if (GSS_ERROR(maj_stat)) {
 940                 DEBUG(1, ("GSS Wrap failed: %s\n",
 941                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 942                 return NT_STATUS_ACCESS_DENIED;
 943         }
 944
 945         if (output_token.length < length) {
 946                 return NT_STATUS_INTERNAL_ERROR;
 947         }
 948
 949         sig_length = gensec_gssapi_sig_size(gensec_security, length);
 950
 951         /* Caller must pad to right boundary */
 952         if (output_token.length != (length + sig_length)) {
 953                 DEBUG(1, ("gensec_gssapi_sign_packet: GSS Wrap length [%ld] does not match caller length [%ld] plus sig size [%ld] = [%ld]\n",
 954                           (long)output_token.length, (long)length, (long)sig_length, (long)(length + sig_length)));
 955                 return NT_STATUS_INTERNAL_ERROR;
 956         }
 957
 958         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
 959
 960         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 961
 962         gss_release_buffer(&min_stat, &output_token);
 963
 964         return NT_STATUS_OK;
 965 }
 966
 967 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
 968                                            TALLOC_CTX *mem_ctx,
 969                                            const uint8_t *data, size_t length,
 970                                            const uint8_t *whole_pdu, size_t pdu_length,
 971                                            const DATA_BLOB *sig)
 972 {
 973         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 974         OM_uint32 maj_stat, min_stat;
 975         gss_buffer_desc input_token, output_token;
 976         int conf_state;
 977         gss_qop_t qop_state;
 978         DATA_BLOB in;
 979
 980         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 981
 982         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
 983
 984         memcpy(in.data, sig->data, sig->length);
 985         memcpy(in.data + sig->length, data, length);
 986
 987         input_token.length = in.length;
 988         input_token.value = in.data;
 989
 990         maj_stat = gss_unwrap(&min_stat,
 991                               gensec_gssapi_state->gssapi_context,
 992                               &input_token,
 993                               &output_token,
 994                               &conf_state,
 995                               &qop_state);
 996         if (GSS_ERROR(maj_stat)) {
 997                 DEBUG(1, ("GSS UnWrap failed: %s\n",
 998                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 999                 return NT_STATUS_ACCESS_DENIED;
1000         }
1001
1002         if (output_token.length != length) {
1003                 return NT_STATUS_INTERNAL_ERROR;
1004         }
1005
1006         gss_release_buffer(&min_stat, &output_token);
1007
1008         return NT_STATUS_OK;
1009 }
1010
1011 /* Try to figure out what features we actually got on the connection */
1012 static BOOL gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1013                                        uint32_t feature)
1014 {
1015         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
1016         if (feature & GENSEC_FEATURE_SIGN) {
1017                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1018                 if (gensec_gssapi_state->sasl
1019                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1020                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1021                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1022                 }
1023                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1024         }
1025         if (feature & GENSEC_FEATURE_SEAL) {
1026                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1027                 if (gensec_gssapi_state->sasl
1028                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1029                         return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
1030                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1031                 }
1032                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1033         }
1034         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1035                 /* Only for GSSAPI/Krb5 */
1036                 if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
1037                     && (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements, gensec_gssapi_state->gss_oid->length) == 0)) {
1038                         return True;
1039                 }
1040         }
1041         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1042                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1043         }
1044         /* We can always do async (rather than strict request/reply) packets.  */
1045         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1046                 return True;
1047         }
1048         return False;
1049 }
1050
1051 /*
1052  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1053  * (for encrypting some passwords).
1054  *
1055  * This breaks all the abstractions, but what do you expect...
1056  */
1057 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1058                                           DATA_BLOB *session_key)
1059 {
1060         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
1061
1062         if (gensec_gssapi_state->session_key.data) {
1063                 *session_key = gensec_gssapi_state->session_key;
1064                 return NT_STATUS_OK;
1065         }
1066
1067         /* Ensure we only call this for GSSAPI/krb5, otherwise things
1068          * could get very ugly */
1069         if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
1070             && (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1071                        gensec_gssapi_state->gss_oid->length) == 0)) {
1072                 OM_uint32 maj_stat, min_stat;
1073                 gss_buffer_desc skey;
1074
1075                 maj_stat = gsskrb5_get_initiator_subkey(&min_stat,
1076                                                         gensec_gssapi_state->gssapi_context,
1077                                                         &skey);
1078
1079                 if (maj_stat == 0) {
1080                         DEBUG(10, ("Got KRB5 session key of length %d\n",
1081                                    (int)skey.length));
1082                         gensec_gssapi_state->session_key = data_blob_talloc(gensec_gssapi_state,
1083                                                                             skey.value, skey.length);
1084                         *session_key = gensec_gssapi_state->session_key;
1085                         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1086
1087                         gss_release_buffer(&min_stat, &skey);
1088                         return NT_STATUS_OK;
1089                 }
1090                 return NT_STATUS_NO_USER_SESSION_KEY;
1091         }
1092
1093         DEBUG(1, ("NO session key for this mech\n"));
1094         return NT_STATUS_NO_USER_SESSION_KEY;
1095 }
1096
1097
1098 /* Get some basic (and authorization) information about the user on
1099  * this session.  This uses either the PAC (if present) or a local
1100  * database lookup */
1101 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1102                                            struct auth_session_info **_session_info)
1103 {
1104         NTSTATUS nt_status;
1105         TALLOC_CTX *mem_ctx;
1106         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
1107         struct auth_serversupplied_info *server_info = NULL;
1108         struct auth_session_info *session_info = NULL;
1109         struct PAC_LOGON_INFO *logon_info;
1110         OM_uint32 maj_stat, min_stat;
1111         gss_buffer_desc name_token;
1112         gss_buffer_desc pac;
1113         krb5_keyblock *keyblock;
1114         time_t authtime;
1115         krb5_principal principal;
1116         char *principal_string;
1117         DATA_BLOB pac_blob;
1118
1119         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1120             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1121                        gensec_gssapi_state->gss_oid->length) != 0)) {
1122                 DEBUG(1, ("NO session info available for this mech\n"));
1123                 return NT_STATUS_INVALID_PARAMETER;
1124         }
1125
1126         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1127         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1128
1129         maj_stat = gss_display_name (&min_stat,
1130                                      gensec_gssapi_state->client_name,
1131                                      &name_token,
1132                                      NULL);
1133         if (maj_stat) {
1134                 talloc_free(mem_ctx);
1135                 return NT_STATUS_FOOBAR;
1136         }
1137
1138         principal_string = talloc_strndup(mem_ctx, name_token.value, name_token.length);
1139
1140         gss_release_buffer(&min_stat, &name_token);
1141
1142         if (!principal_string) {
1143                 talloc_free(mem_ctx);
1144                 return NT_STATUS_NO_MEMORY;
1145         }
1146
1147         maj_stat = gss_krb5_copy_service_keyblock(&min_stat,
1148                                                   gensec_gssapi_state->gssapi_context,
1149                                                   &keyblock);
1150
1151         if (maj_stat == 0) {
1152                 maj_stat = gsskrb5_extract_authtime_from_sec_context(&min_stat,
1153                                                                      gensec_gssapi_state->gssapi_context,
1154                                                                      &authtime);
1155         }
1156
1157         if (maj_stat == 0) {
1158                 maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1159                                                                        gensec_gssapi_state->gssapi_context,
1160                                                                        KRB5_AUTHDATA_WIN2K_PAC,
1161                                                                        &pac);
1162         }
1163
1164         if (maj_stat == 0) {
1165                 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1166                 gss_release_buffer(&min_stat, &pac);
1167         }
1168
1169         /* IF we have the PAC - otherwise we need to get this
1170          * data from elsewere - local ldb, or (TODO) lookup of some
1171          * kind...
1172          */
1173         if (maj_stat == 0) {
1174                 krb5_error_code ret;
1175
1176                 ret = krb5_parse_name(gensec_gssapi_state->smb_krb5_context->krb5_context,
1177                                       principal_string, &principal);
1178                 if (ret) {
1179                         talloc_free(mem_ctx);
1180                         return NT_STATUS_INVALID_PARAMETER;
1181                 }
1182
1183                 /* decode and verify the pac */
1184                 nt_status = kerberos_pac_logon_info(mem_ctx, &logon_info, pac_blob,
1185                                                     gensec_gssapi_state->smb_krb5_context->krb5_context,
1186                                                     NULL, keyblock, principal, authtime, NULL);
1187                 krb5_free_principal(gensec_gssapi_state->smb_krb5_context->krb5_context, principal);
1188
1189                 if (NT_STATUS_IS_OK(nt_status)) {
1190                         union netr_Validation validation;
1191                         validation.sam3 = &logon_info->info3;
1192                         nt_status = make_server_info_netlogon_validation(gensec_gssapi_state,
1193                                                                          NULL,
1194                                                                          3, &validation,
1195                                                                          &server_info);
1196                         if (!NT_STATUS_IS_OK(nt_status)) {
1197                                 talloc_free(mem_ctx);
1198                                 return nt_status;
1199                         }
1200                 } else {
1201                         maj_stat = 1;
1202                 }
1203         }
1204
1205         if (maj_stat) {
1206                 DEBUG(1, ("Unable to use PAC, resorting to local user lookup!\n"));
1207                 nt_status = sam_get_server_info_principal(mem_ctx, principal_string,
1208                                                           &server_info);
1209
1210                 if (!NT_STATUS_IS_OK(nt_status)) {
1211                         talloc_free(mem_ctx);
1212                         return nt_status;
1213                 }
1214         }
1215
1216         /* references the server_info into the session_info */
1217         nt_status = auth_generate_session_info(mem_ctx, server_info, &session_info);
1218         if (!NT_STATUS_IS_OK(nt_status)) {
1219                 talloc_free(mem_ctx);
1220                 return nt_status;
1221         }
1222
1223         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1224         if (!NT_STATUS_IS_OK(nt_status)) {
1225                 talloc_free(mem_ctx);
1226                 return nt_status;
1227         }
1228
1229         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1230                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1231         } else {
1232                 krb5_error_code ret;
1233                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1234                 session_info->credentials = cli_credentials_init(session_info);
1235                 if (!session_info->credentials) {
1236                         talloc_free(mem_ctx);
1237                         return NT_STATUS_NO_MEMORY;
1238                 }
1239
1240                 cli_credentials_set_conf(session_info->credentials);
1241
1242                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1243                                                            gensec_gssapi_state->delegated_cred_handle,
1244                                                            CRED_SPECIFIED);
1245                 if (ret) {
1246                         talloc_free(mem_ctx);
1247                         return NT_STATUS_NO_MEMORY;
1248                 }
1249                 /* It has been taken from this place... */
1250                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1251         }
1252         talloc_steal(gensec_gssapi_state, session_info);
1253         talloc_free(mem_ctx);
1254         *_session_info = session_info;
1255
1256         return NT_STATUS_OK;
1257 }
1258
1259 static const char *gensec_gssapi_krb5_oids[] = {
1260         GENSEC_OID_KERBEROS5,
1261         GENSEC_OID_KERBEROS5_OLD,
1262         NULL
1263 };
1264
1265 /* As a server, this could in theory accept any GSSAPI mech */
1266 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1267         .name           = "gssapi_krb5",
1268         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1269         .oid            = gensec_gssapi_krb5_oids,
1270         .client_start   = gensec_gssapi_client_start,
1271         .server_start   = gensec_gssapi_server_start,
1272         .magic          = gensec_gssapi_magic,
1273         .update         = gensec_gssapi_update,
1274         .session_key    = gensec_gssapi_session_key,
1275         .session_info   = gensec_gssapi_session_info,
1276         .sig_size       = gensec_gssapi_sig_size,
1277         .sign_packet    = gensec_gssapi_sign_packet,
1278         .check_packet   = gensec_gssapi_check_packet,
1279         .seal_packet    = gensec_gssapi_seal_packet,
1280         .unseal_packet  = gensec_gssapi_unseal_packet,
1281         .wrap           = gensec_gssapi_wrap,
1282         .unwrap         = gensec_gssapi_unwrap,
1283         .have_feature   = gensec_gssapi_have_feature,
1284         .enabled        = True,
1285         .kerberos       = True
1286 };
1287
1288 /* As a server, this could in theory accept any GSSAPI mech */
1289 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1290         .name           = "gssapi_krb5_sasl",
1291         .sasl_name      = "GSSAPI",
1292         .client_start   = gensec_gssapi_sasl_client_start,
1293         .server_start   = gensec_gssapi_sasl_server_start,
1294         .update         = gensec_gssapi_update,
1295         .session_key    = gensec_gssapi_session_key,
1296         .session_info   = gensec_gssapi_session_info,
1297         .wrap           = gensec_gssapi_wrap,
1298         .unwrap         = gensec_gssapi_unwrap,
1299         .have_feature   = gensec_gssapi_have_feature,
1300         .enabled        = True,
1301         .kerberos       = True
1302 };
1303
1304 NTSTATUS gensec_gssapi_init(void)
1305 {
1306         NTSTATUS ret;
1307
1308         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1309         if (!NT_STATUS_IS_OK(ret)) {
1310                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1311                         gensec_gssapi_krb5_security_ops.name));
1312                 return ret;
1313         }
1314
1315         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1316         if (!NT_STATUS_IS_OK(ret)) {
1317                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1318                         gensec_gssapi_sasl_krb5_security_ops.name));
1319                 return ret;
1320         }
1321
1322         return ret;
1323 }