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/ndr_krb5pac.h"
  29 #include "auth/auth.h"
  30 #include "lib/ldb/include/ldb.h"
  31 #include "auth/auth_sam.h"
  32
  33 enum gensec_gssapi_sasl_state
  34 {
  35         STAGE_GSS_NEG,
  36         STAGE_SASL_SSF_NEG,
  37         STAGE_SASL_SSF_ACCEPT,
  38         STAGE_DONE
  39 };
  40
  41 #define NEG_SEAL 0x4
  42 #define NEG_SIGN 0x2
  43 #define NEG_NONE 0x1
  44
  45 struct gensec_gssapi_state {
  46         gss_ctx_id_t gssapi_context;
  47         struct gss_channel_bindings_struct *input_chan_bindings;
  48         gss_name_t server_name;
  49         gss_name_t client_name;
  50         OM_uint32 want_flags, got_flags;
  51         const gss_OID_desc *gss_oid;
  52
  53         DATA_BLOB session_key;
  54         DATA_BLOB pac;
  55
  56         struct smb_krb5_context *smb_krb5_context;
  57         struct gssapi_creds_container *client_cred;
  58         struct gssapi_creds_container *server_cred;
  59
  60         gss_cred_id_t delegated_cred_handle;
  61
  62         BOOL sasl; /* We have two different mechs in this file: One
  63                     * for SASL wrapped GSSAPI and another for normal
  64                     * GSSAPI */
  65         enum gensec_gssapi_sasl_state sasl_state;
  66         uint8_t sasl_protection; /* What was negotiated at the SASL
  67                                   * layer, independent of the GSSAPI
  68                                   * layer... */
  69 };
  70
  71 static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
  72                                  OM_uint32 maj_stat, OM_uint32 min_stat)
  73 {
  74         OM_uint32 disp_min_stat, disp_maj_stat;
  75         gss_buffer_desc maj_error_message;
  76         gss_buffer_desc min_error_message;
  77         OM_uint32 msg_ctx = 0;
  78
  79         char *ret;
  80
  81         maj_error_message.value = NULL;
  82         min_error_message.value = NULL;
  83
  84         disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
  85                            GSS_C_NULL_OID, &msg_ctx, &maj_error_message);
  86         disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
  87                            GSS_C_NULL_OID, &msg_ctx, &min_error_message);
  88         ret = talloc_asprintf(mem_ctx, "%s: %s", (char *)maj_error_message.value, (char *)min_error_message.value);
  89
  90         gss_release_buffer(&disp_min_stat, &maj_error_message);
  91         gss_release_buffer(&disp_min_stat, &min_error_message);
  92
  93         return ret;
  94 }
  95
  96
  97 static int gensec_gssapi_destory(void *ptr)
  98 {
  99         struct gensec_gssapi_state *gensec_gssapi_state = ptr;
 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 (strequal(hostname, "localhost")) {
 255                 DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
 256                 return NT_STATUS_INVALID_PARAMETER;
 257         }
 258
 259         nt_status = gensec_gssapi_start(gensec_security);
 260         if (!NT_STATUS_IS_OK(nt_status)) {
 261                 return nt_status;
 262         }
 263
 264         gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 265
 266         principal = gensec_get_target_principal(gensec_security);
 267         if (principal && lp_client_use_spnego_principal()) {
 268                 name_token.value  = discard_const_p(uint8_t, principal);
 269                 name_token.length = strlen(principal);
 270
 271                 name_type = GSS_C_NULL_OID;
 272         } else {
 273                 principal = talloc_asprintf(gensec_gssapi_state, "%s@%s",
 274                                             gensec_get_target_service(gensec_security),
 275                                             hostname);
 276
 277                 name_token.value  = discard_const_p(uint8_t, principal);
 278                 name_token.length = strlen(principal);
 279
 280                 name_type = GSS_C_NT_HOSTBASED_SERVICE;
 281         }
 282
 283         maj_stat = gss_import_name (&min_stat,
 284                                     &name_token,
 285                                     name_type,
 286                                     &gensec_gssapi_state->server_name);
 287         if (maj_stat) {
 288                 DEBUG(2, ("GSS Import name of %s failed: %s\n",
 289                           (char *)name_token.value,
 290                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
 291                 return NT_STATUS_INVALID_PARAMETER;
 292         }
 293
 294         ret = cli_credentials_get_client_gss_creds(creds, &gcc);
 295         switch (ret) {
 296         case 0:
 297                 break;
 298         case KRB5_KDC_UNREACH:
 299                 DEBUG(3, ("Cannot reach a KDC we require\n"));
 300                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 301         default:
 302                 DEBUG(1, ("Aquiring initiator credentails failed\n"));
 303                 return NT_STATUS_UNSUCCESSFUL;
 304         }
 305
 306         gensec_gssapi_state->client_cred = gcc;
 307
 308         return NT_STATUS_OK;
 309 }
 310
 311 static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
 312 {
 313         NTSTATUS nt_status;
 314         struct gensec_gssapi_state *gensec_gssapi_state;
 315         nt_status = gensec_gssapi_client_start(gensec_security);
 316
 317         if (NT_STATUS_IS_OK(nt_status)) {
 318                 gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
 319                 gensec_gssapi_state->sasl = True;
 320         }
 321         return nt_status;
 322 }
 323
 324
 325 /**
 326  * Check if the packet is one for this mechansim
 327  *
 328  * @param gensec_security GENSEC state
 329  * @param in The request, as a DATA_BLOB
 330  * @return Error, INVALID_PARAMETER if it's not a packet for us
 331  *                or NT_STATUS_OK if the packet is ok.
 332  */
 333
 334 static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
 335                                     const DATA_BLOB *in)
 336 {
 337         if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
 338                 return NT_STATUS_OK;
 339         } else {
 340                 return NT_STATUS_INVALID_PARAMETER;
 341         }
 342 }
 343
 344
 345 /**
 346  * Next state function for the GSSAPI GENSEC mechanism
 347  *
 348  * @param gensec_gssapi_state GSSAPI State
 349  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 350  * @param in The request, as a DATA_BLOB
 351  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 352  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 353  *                or NT_STATUS_OK if the user is authenticated.
 354  */
 355
 356 static NTSTATUS gensec_gssapi_update(struct gensec_security *gensec_security,
 357                                    TALLOC_CTX *out_mem_ctx,
 358                                    const DATA_BLOB in, DATA_BLOB *out)
 359 {
 360         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 361         NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
 362         OM_uint32 maj_stat, min_stat;
 363         OM_uint32 min_stat2;
 364         gss_buffer_desc input_token, output_token;
 365         gss_OID gss_oid_p;
 366         input_token.length = in.length;
 367         input_token.value = in.data;
 368
 369         switch (gensec_gssapi_state->sasl_state) {
 370         case STAGE_GSS_NEG:
 371         {
 372                 switch (gensec_security->gensec_role) {
 373                 case GENSEC_CLIENT:
 374                 {
 375                         maj_stat = gss_init_sec_context(&min_stat,
 376                                                         gensec_gssapi_state->client_cred->creds,
 377                                                         &gensec_gssapi_state->gssapi_context,
 378                                                         gensec_gssapi_state->server_name,
 379                                                         discard_const_p(gss_OID_desc, gensec_gssapi_state->gss_oid),
 380                                                         gensec_gssapi_state->want_flags,
 381                                                         0,
 382                                                         gensec_gssapi_state->input_chan_bindings,
 383                                                         &input_token,
 384                                                         NULL,
 385                                                         &output_token,
 386                                                         &gensec_gssapi_state->got_flags, /* ret flags */
 387                                                         NULL);
 388                         break;
 389                 }
 390                 case GENSEC_SERVER:
 391                 {
 392                         maj_stat = gss_accept_sec_context(&min_stat,
 393                                                           &gensec_gssapi_state->gssapi_context,
 394                                                           gensec_gssapi_state->server_cred->creds,
 395                                                           &input_token,
 396                                                           gensec_gssapi_state->input_chan_bindings,
 397                                                           &gensec_gssapi_state->client_name,
 398                                                           &gss_oid_p,
 399                                                           &output_token,
 400                                                           &gensec_gssapi_state->got_flags,
 401                                                           NULL,
 402                                                           &gensec_gssapi_state->delegated_cred_handle);
 403                         gensec_gssapi_state->gss_oid = gss_oid_p;
 404                         break;
 405                 }
 406                 default:
 407                         return NT_STATUS_INVALID_PARAMETER;
 408
 409                 }
 410
 411                 if (maj_stat == GSS_S_COMPLETE) {
 412                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 413                         gss_release_buffer(&min_stat2, &output_token);
 414
 415                         if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
 416                                 DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
 417                         } else {
 418                                 DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
 419                         }
 420
 421                         /* We may have been invoked as SASL, so there
 422                          * is more work to do */
 423                         if (gensec_gssapi_state->sasl) {
 424                                 /* Due to a very subtle interaction
 425                                  * with SASL and the LDAP libs, we
 426                                  * must ensure the data pointer is
 427                                  * != NULL, but the length is 0.
 428                                  *
 429                                  * This ensures we send a 'zero
 430                                  * length' (rather than NULL) response
 431                                  */
 432
 433                                 if (!out->data) {
 434                                         out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
 435                                 }
 436
 437                                 gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
 438                                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 439                         } else {
 440                                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 441
 442                                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 443                                         DEBUG(3, ("GSSAPI Connection will be cryptographicly sealed\n"));
 444                                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 445                                         DEBUG(3, ("GSSAPI Connection will be cryptographicly signed\n"));
 446                                 } else {
 447                                         DEBUG(3, ("GSSAPI Connection will have no cryptographicly protection\n"));
 448                                 }
 449
 450                                 return NT_STATUS_OK;
 451                         }
 452                 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
 453                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 454                         gss_release_buffer(&min_stat2, &output_token);
 455
 456                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 457                 } else if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
 458                            && (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
 459                                       gensec_gssapi_state->gss_oid->length) == 0)) {
 460                         switch (min_stat) {
 461                         case KRB5_KDC_UNREACH:
 462                                 DEBUG(3, ("Cannot reach a KDC we require: %s\n",
 463                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
 464                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 465                         case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
 466                                 DEBUG(3, ("Server is not registered with our KDC: %s\n",
 467                                           gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat)));
 468                                 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
 469                         case KRB5KRB_AP_ERR_MSG_TYPE:
 470                                 /* garbage input, possibly from the auto-mech detection */
 471                                 return NT_STATUS_INVALID_PARAMETER;
 472                         default:
 473                                 DEBUG(1, ("GSS(krb5) Update failed: %s\n",
 474                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 475                                 return nt_status;
 476                         }
 477                 } else {
 478                         DEBUG(1, ("GSS Update failed: %s\n",
 479                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 480                         return nt_status;
 481                 }
 482                 break;
 483         }
 484         /* These last two stages are only done if we were invoked as SASL */
 485         case STAGE_SASL_SSF_NEG:
 486         {
 487                 switch (gensec_security->gensec_role) {
 488                 case GENSEC_CLIENT:
 489                 {
 490                         uint8_t maxlength_proposed[4];
 491                         uint8_t security_supported;
 492                         int conf_state;
 493                         gss_qop_t qop_state;
 494                         input_token.length = in.length;
 495                         input_token.value = in.data;
 496
 497                         maj_stat = gss_unwrap(&min_stat,
 498                                               gensec_gssapi_state->gssapi_context,
 499                                               &input_token,
 500                                               &output_token,
 501                                               &conf_state,
 502                                               &qop_state);
 503                         if (GSS_ERROR(maj_stat)) {
 504                                 DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 505                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 506                                 return NT_STATUS_ACCESS_DENIED;
 507                         }
 508
 509                         if (output_token.length < 4) {
 510                                 return NT_STATUS_INVALID_PARAMETER;
 511                         }
 512
 513                         memcpy(maxlength_proposed, output_token.value, 4);
 514                         gss_release_buffer(&min_stat, &output_token);
 515
 516                         /* first byte is the proposed security */
 517                         security_supported = maxlength_proposed[0];
 518                         maxlength_proposed[0] = '\0';
 519                         gensec_gssapi_state->sasl_protection = 0;
 520                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 521                                 if (security_supported & NEG_SEAL) {
 522                                         gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 523                                 }
 524                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 525                                 if (security_supported & NEG_SIGN) {
 526                                         gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 527                                 }
 528                         } else if (security_supported & NEG_NONE) {
 529                                 gensec_gssapi_state->sasl_protection |= NEG_NONE;
 530                         } else {
 531                                 DEBUG(1, ("Remote server does not support unprotected connections"));
 532                                 return NT_STATUS_ACCESS_DENIED;
 533                         }
 534
 535                         /* We just accept their max length, and send
 536                          * it back with the SASL flags */
 537                         maxlength_proposed[0] = gensec_gssapi_state->sasl_protection;
 538
 539                         input_token.value = maxlength_proposed;
 540                         input_token.length = sizeof(maxlength_proposed);
 541
 542                         maj_stat = gss_wrap(&min_stat,
 543                                             gensec_gssapi_state->gssapi_context,
 544                                             False,
 545                                             GSS_C_QOP_DEFAULT,
 546                                             &input_token,
 547                                             &conf_state,
 548                                             &output_token);
 549                         if (GSS_ERROR(maj_stat)) {
 550                                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 551                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 552                                 return NT_STATUS_ACCESS_DENIED;
 553                         }
 554
 555                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 556                         gss_release_buffer(&min_stat, &output_token);
 557
 558                         /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 559                         gensec_gssapi_state->sasl_state = STAGE_DONE;
 560
 561                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 562                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
 563                         } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 564                                 DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
 565                         } else {
 566                                 DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
 567                         }
 568
 569                         return NT_STATUS_OK;
 570                 }
 571                 case GENSEC_SERVER:
 572                 {
 573                         uint8_t maxlength_proposed[4];
 574                         uint8_t security_supported = 0x0;
 575                         int conf_state;
 576
 577                         /* TODO: Need some better ideas for this */
 578                         RSIVAL(maxlength_proposed, 0, 0xFFFFFF);
 579                         /* first byte is the proposed security */
 580                         maxlength_proposed[0] = '\0';
 581
 582                         gensec_gssapi_state->sasl_protection = 0;
 583                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 584                                 security_supported |= NEG_SEAL;
 585                         }
 586                         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 587                                 security_supported |= NEG_SIGN;
 588                         }
 589                         if (security_supported == 0) {
 590                                 /* If we don't support anything, this must be 0 */
 591                                 RSIVAL(maxlength_proposed, 0, 0x0);
 592                         }
 593
 594                         /* TODO:  We may not wish to support this */
 595                         security_supported |= NEG_NONE;
 596
 597                         /* Ignore 'in' */
 598                         maxlength_proposed[0] = security_supported;
 599
 600                         input_token.value = maxlength_proposed;
 601                         input_token.length = sizeof(maxlength_proposed);
 602
 603                         maj_stat = gss_wrap(&min_stat,
 604                                             gensec_gssapi_state->gssapi_context,
 605                                             False,
 606                                             GSS_C_QOP_DEFAULT,
 607                                             &input_token,
 608                                             &conf_state,
 609                                             &output_token);
 610                         if (GSS_ERROR(maj_stat)) {
 611                                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 612                                           gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 613                                 return NT_STATUS_ACCESS_DENIED;
 614                         }
 615
 616                         *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
 617                         gss_release_buffer(&min_stat, &output_token);
 618
 619                         gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
 620                         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 621                 }
 622                 default:
 623                         return NT_STATUS_INVALID_PARAMETER;
 624
 625                 }
 626         }
 627         /* This is s server-only stage */
 628         case STAGE_SASL_SSF_ACCEPT:
 629         {
 630                 uint8_t maxlength_proposed[4];
 631                 uint8_t security_proposed;
 632                 int conf_state;
 633                 gss_qop_t qop_state;
 634                 input_token.length = in.length;
 635                 input_token.value = in.data;
 636
 637                 maj_stat = gss_unwrap(&min_stat,
 638                                       gensec_gssapi_state->gssapi_context,
 639                                       &input_token,
 640                                       &output_token,
 641                                       &conf_state,
 642                                       &qop_state);
 643                 if (GSS_ERROR(maj_stat)) {
 644                         DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
 645                                   gssapi_error_string(out_mem_ctx, maj_stat, min_stat)));
 646                         return NT_STATUS_ACCESS_DENIED;
 647                 }
 648
 649                 if (output_token.length < 4) {
 650                         return NT_STATUS_INVALID_PARAMETER;
 651                 }
 652
 653                 memcpy(maxlength_proposed, output_token.value, 4);
 654                 gss_release_buffer(&min_stat, &output_token);
 655
 656                 /* first byte is the proposed security */
 657                 /* TODO: We should do something with the rest, but for now... */
 658                 security_proposed = maxlength_proposed[0];
 659
 660                 maxlength_proposed[0] = 0x0;
 661                 gensec_gssapi_state->sasl_protection = 0;
 662                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 663                         if (security_proposed & NEG_SEAL) {
 664                                 gensec_gssapi_state->sasl_protection |= NEG_SEAL;
 665                         }
 666                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 667                         if (security_proposed & NEG_SIGN) {
 668                                 gensec_gssapi_state->sasl_protection |= NEG_SIGN;
 669                         }
 670                 } else if (security_proposed & NEG_NONE) {
 671                         gensec_gssapi_state->sasl_protection |= NEG_NONE;
 672                 } else {
 673                         DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
 674                         return NT_STATUS_ACCESS_DENIED;
 675                 }
 676
 677                 /* quirk:  This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
 678                 gensec_gssapi_state->sasl_state = STAGE_DONE;
 679                 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
 680                         DEBUG(3, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
 681                 } else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
 682                         DEBUG(3, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
 683                 } else {
 684                         DEBUG(3, ("SASL/GSSAPI Connection from client will have no cryptographicly protection\n"));
 685                 }
 686
 687                 *out = data_blob(NULL, 0);
 688                 return NT_STATUS_OK;
 689         }
 690         default:
 691                 return NT_STATUS_INVALID_PARAMETER;
 692         }
 693 }
 694
 695 static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
 696                                    TALLOC_CTX *mem_ctx,
 697                                    const DATA_BLOB *in,
 698                                    DATA_BLOB *out)
 699 {
 700         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 701         OM_uint32 maj_stat, min_stat;
 702         gss_buffer_desc input_token, output_token;
 703         int conf_state;
 704         input_token.length = in->length;
 705         input_token.value = in->data;
 706
 707         maj_stat = gss_wrap(&min_stat,
 708                             gensec_gssapi_state->gssapi_context,
 709                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 710                             GSS_C_QOP_DEFAULT,
 711                             &input_token,
 712                             &conf_state,
 713                             &output_token);
 714         if (GSS_ERROR(maj_stat)) {
 715                 DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
 716                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 717                 return NT_STATUS_ACCESS_DENIED;
 718         }
 719
 720         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 721         gss_release_buffer(&min_stat, &output_token);
 722
 723         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 724             && !conf_state) {
 725                 return NT_STATUS_ACCESS_DENIED;
 726         }
 727         return NT_STATUS_OK;
 728 }
 729
 730 static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
 731                                      TALLOC_CTX *mem_ctx,
 732                                      const DATA_BLOB *in,
 733                                      DATA_BLOB *out)
 734 {
 735         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 736         OM_uint32 maj_stat, min_stat;
 737         gss_buffer_desc input_token, output_token;
 738         int conf_state;
 739         gss_qop_t qop_state;
 740         input_token.length = in->length;
 741         input_token.value = in->data;
 742
 743         maj_stat = gss_unwrap(&min_stat,
 744                               gensec_gssapi_state->gssapi_context,
 745                               &input_token,
 746                               &output_token,
 747                               &conf_state,
 748                               &qop_state);
 749         if (GSS_ERROR(maj_stat)) {
 750                 DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
 751                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 752                 return NT_STATUS_ACCESS_DENIED;
 753         }
 754
 755         *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
 756         gss_release_buffer(&min_stat, &output_token);
 757
 758         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 759             && !conf_state) {
 760                 return NT_STATUS_ACCESS_DENIED;
 761         }
 762         return NT_STATUS_OK;
 763 }
 764
 765 /* Find out the size of the signature, assuming (incorrectly) that it
 766  * GSSAPI provides any guarantees as to it's size.
 767  *
 768  * This is needed by the DCE/RPC code, which uses AEAD
 769  * (signed headers, including signature legnth and a sealed body)
 770  */
 771 static size_t gensec_gssapi_sig_size(struct gensec_security *gensec_security, size_t data_size)
 772 {
 773         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 774         OM_uint32 maj_stat, min_stat;
 775         OM_uint32 output_size;
 776         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
 777             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
 778                        gensec_gssapi_state->gss_oid->length) != 0)) {
 779                 DEBUG(1, ("NO sig size available for this mech\n"));
 780                 return 0;
 781         }
 782
 783         maj_stat = gsskrb5_wrap_size(&min_stat,
 784                                      gensec_gssapi_state->gssapi_context,
 785                                      gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 786                                      GSS_C_QOP_DEFAULT,
 787                                      data_size,
 788                                      &output_size);
 789         if (GSS_ERROR(maj_stat)) {
 790                 TALLOC_CTX *mem_ctx = talloc_new(NULL);
 791                 DEBUG(1, ("gensec_gssapi_seal_packet: determinaing signature size with gss_wrap_size_limit failed: %s\n",
 792                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 793                 talloc_free(mem_ctx);
 794                 return 0;
 795         }
 796
 797         if (output_size < data_size) {
 798                 return 0;
 799         }
 800
 801         /* The difference between the max output and the max input must be the signature */
 802         return output_size - data_size;
 803 }
 804
 805 static NTSTATUS gensec_gssapi_seal_packet(struct gensec_security *gensec_security,
 806                                           TALLOC_CTX *mem_ctx,
 807                                           uint8_t *data, size_t length,
 808                                           const uint8_t *whole_pdu, size_t pdu_length,
 809                                           DATA_BLOB *sig)
 810 {
 811         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 812         OM_uint32 maj_stat, min_stat;
 813         gss_buffer_desc input_token, output_token;
 814         int conf_state;
 815         ssize_t sig_length;
 816
 817         input_token.length = length;
 818         input_token.value = data;
 819
 820         maj_stat = gss_wrap(&min_stat,
 821                             gensec_gssapi_state->gssapi_context,
 822                             gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
 823                             GSS_C_QOP_DEFAULT,
 824                             &input_token,
 825                             &conf_state,
 826                             &output_token);
 827         if (GSS_ERROR(maj_stat)) {
 828                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
 829                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 830                 return NT_STATUS_ACCESS_DENIED;
 831         }
 832
 833         sig_length = gensec_gssapi_sig_size(gensec_security, length);
 834
 835         /* Caller must pad to right boundary */
 836         if (output_token.length != (length + sig_length)) {
 837                 DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] does not match caller length [%ld] plus sig size [%ld] = [%ld]\n",
 838                           (long)output_token.length, (long)length, (long)sig_length, (long)(length + sig_length)));
 839                 return NT_STATUS_INTERNAL_ERROR;
 840         }
 841
 842         memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
 843         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
 844
 845         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 846         dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
 847         dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
 848
 849         gss_release_buffer(&min_stat, &output_token);
 850
 851         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 852             && !conf_state) {
 853                 return NT_STATUS_ACCESS_DENIED;
 854         }
 855         return NT_STATUS_OK;
 856 }
 857
 858 static NTSTATUS gensec_gssapi_unseal_packet(struct gensec_security *gensec_security,
 859                                             TALLOC_CTX *mem_ctx,
 860                                             uint8_t *data, size_t length,
 861                                             const uint8_t *whole_pdu, size_t pdu_length,
 862                                             const DATA_BLOB *sig)
 863 {
 864         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 865         OM_uint32 maj_stat, min_stat;
 866         gss_buffer_desc input_token, output_token;
 867         int conf_state;
 868         gss_qop_t qop_state;
 869         DATA_BLOB in;
 870
 871         dump_data_pw("gensec_gssapi_unseal_packet: sig\n", sig->data, sig->length);
 872
 873         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
 874
 875         memcpy(in.data, sig->data, sig->length);
 876         memcpy(in.data + sig->length, data, length);
 877
 878         input_token.length = in.length;
 879         input_token.value = in.data;
 880
 881         maj_stat = gss_unwrap(&min_stat,
 882                               gensec_gssapi_state->gssapi_context,
 883                               &input_token,
 884                               &output_token,
 885                               &conf_state,
 886                               &qop_state);
 887         if (GSS_ERROR(maj_stat)) {
 888                 DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
 889                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 890                 return NT_STATUS_ACCESS_DENIED;
 891         }
 892
 893         if (output_token.length != length) {
 894                 return NT_STATUS_INTERNAL_ERROR;
 895         }
 896
 897         memcpy(data, output_token.value, length);
 898
 899         gss_release_buffer(&min_stat, &output_token);
 900
 901         if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
 902             && !conf_state) {
 903                 return NT_STATUS_ACCESS_DENIED;
 904         }
 905         return NT_STATUS_OK;
 906 }
 907
 908 static NTSTATUS gensec_gssapi_sign_packet(struct gensec_security *gensec_security,
 909                                           TALLOC_CTX *mem_ctx,
 910                                           const uint8_t *data, size_t length,
 911                                           const uint8_t *whole_pdu, size_t pdu_length,
 912                                           DATA_BLOB *sig)
 913 {
 914         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 915         OM_uint32 maj_stat, min_stat;
 916         gss_buffer_desc input_token, output_token;
 917         int conf_state;
 918         ssize_t sig_length = 0;
 919
 920         input_token.length = length;
 921         input_token.value = discard_const_p(uint8_t *, data);
 922
 923         maj_stat = gss_wrap(&min_stat,
 924                             gensec_gssapi_state->gssapi_context,
 925                             0,
 926                             GSS_C_QOP_DEFAULT,
 927                             &input_token,
 928                             &conf_state,
 929                             &output_token);
 930         if (GSS_ERROR(maj_stat)) {
 931                 DEBUG(1, ("GSS Wrap failed: %s\n",
 932                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 933                 return NT_STATUS_ACCESS_DENIED;
 934         }
 935
 936         if (output_token.length < length) {
 937                 return NT_STATUS_INTERNAL_ERROR;
 938         }
 939
 940         sig_length = gensec_gssapi_sig_size(gensec_security, length);
 941
 942         /* Caller must pad to right boundary */
 943         if (output_token.length != (length + sig_length)) {
 944                 DEBUG(1, ("gensec_gssapi_sign_packet: GSS Wrap length [%ld] does not match caller length [%ld] plus sig size [%ld] = [%ld]\n",
 945                           (long)output_token.length, (long)length, (long)sig_length, (long)(length + sig_length)));
 946                 return NT_STATUS_INTERNAL_ERROR;
 947         }
 948
 949         *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
 950
 951         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 952
 953         gss_release_buffer(&min_stat, &output_token);
 954
 955         return NT_STATUS_OK;
 956 }
 957
 958 static NTSTATUS gensec_gssapi_check_packet(struct gensec_security *gensec_security,
 959                                            TALLOC_CTX *mem_ctx,
 960                                            const uint8_t *data, size_t length,
 961                                            const uint8_t *whole_pdu, size_t pdu_length,
 962                                            const DATA_BLOB *sig)
 963 {
 964         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
 965         OM_uint32 maj_stat, min_stat;
 966         gss_buffer_desc input_token, output_token;
 967         int conf_state;
 968         gss_qop_t qop_state;
 969         DATA_BLOB in;
 970
 971         dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
 972
 973         in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
 974
 975         memcpy(in.data, sig->data, sig->length);
 976         memcpy(in.data + sig->length, data, length);
 977
 978         input_token.length = in.length;
 979         input_token.value = in.data;
 980
 981         maj_stat = gss_unwrap(&min_stat,
 982                               gensec_gssapi_state->gssapi_context,
 983                               &input_token,
 984                               &output_token,
 985                               &conf_state,
 986                               &qop_state);
 987         if (GSS_ERROR(maj_stat)) {
 988                 DEBUG(1, ("GSS UnWrap failed: %s\n",
 989                           gssapi_error_string(mem_ctx, maj_stat, min_stat)));
 990                 return NT_STATUS_ACCESS_DENIED;
 991         }
 992
 993         if (output_token.length != length) {
 994                 return NT_STATUS_INTERNAL_ERROR;
 995         }
 996
 997         gss_release_buffer(&min_stat, &output_token);
 998
 999         return NT_STATUS_OK;
1000 }
1001
1002 /* Try to figure out what features we actually got on the connection */
1003 static BOOL gensec_gssapi_have_feature(struct gensec_security *gensec_security,
1004                                        uint32_t feature)
1005 {
1006         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
1007         if (feature & GENSEC_FEATURE_SIGN) {
1008                 /* If we are going GSSAPI SASL, then we honour the second negotiation */
1009                 if (gensec_gssapi_state->sasl
1010                     && gensec_gssapi_state->sasl_state == STAGE_DONE) {
1011                         return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
1012                                 && (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
1013                 }
1014                 return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
1015         }
1016         if (feature & GENSEC_FEATURE_SEAL) {
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_SEAL)
1021                                  && (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
1022                 }
1023                 return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
1024         }
1025         if (feature & GENSEC_FEATURE_SESSION_KEY) {
1026                 /* Only for GSSAPI/Krb5 */
1027                 if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
1028                     && (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements, gensec_gssapi_state->gss_oid->length) == 0)) {
1029                         return True;
1030                 }
1031         }
1032         if (feature & GENSEC_FEATURE_DCE_STYLE) {
1033                 return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
1034         }
1035         /* We can always do async (rather than strict request/reply) packets.  */
1036         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
1037                 return True;
1038         }
1039         return False;
1040 }
1041
1042 /*
1043  * Extract the 'sesssion key' needed by SMB signing and ncacn_np
1044  * (for encrypting some passwords).
1045  *
1046  * This breaks all the abstractions, but what do you expect...
1047  */
1048 static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
1049                                           DATA_BLOB *session_key)
1050 {
1051         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
1052
1053         if (gensec_gssapi_state->session_key.data) {
1054                 *session_key = gensec_gssapi_state->session_key;
1055                 return NT_STATUS_OK;
1056         }
1057
1058         /* Ensure we only call this for GSSAPI/krb5, otherwise things
1059          * could get very ugly */
1060         if ((gensec_gssapi_state->gss_oid->length == gss_mech_krb5->length)
1061             && (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1062                        gensec_gssapi_state->gss_oid->length) == 0)) {
1063                 OM_uint32 maj_stat, min_stat;
1064                 gss_buffer_desc skey;
1065
1066                 maj_stat = gsskrb5_get_initiator_subkey(&min_stat,
1067                                                         gensec_gssapi_state->gssapi_context,
1068                                                         &skey);
1069
1070                 if (maj_stat == 0) {
1071                         DEBUG(10, ("Got KRB5 session key of length %d\n",
1072                                    (int)skey.length));
1073                         gensec_gssapi_state->session_key = data_blob_talloc(gensec_gssapi_state,
1074                                                                             skey.value, skey.length);
1075                         *session_key = gensec_gssapi_state->session_key;
1076                         dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
1077
1078                         gss_release_buffer(&min_stat, &skey);
1079                         return NT_STATUS_OK;
1080                 }
1081                 return NT_STATUS_NO_USER_SESSION_KEY;
1082         }
1083
1084         DEBUG(1, ("NO session key for this mech\n"));
1085         return NT_STATUS_NO_USER_SESSION_KEY;
1086 }
1087
1088
1089 /* Get some basic (and authorization) information about the user on
1090  * this session.  This uses either the PAC (if present) or a local
1091  * database lookup */
1092 static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
1093                                            struct auth_session_info **_session_info)
1094 {
1095         NTSTATUS nt_status;
1096         TALLOC_CTX *mem_ctx;
1097         struct gensec_gssapi_state *gensec_gssapi_state = gensec_security->private_data;
1098         struct auth_serversupplied_info *server_info = NULL;
1099         struct auth_session_info *session_info = NULL;
1100         struct PAC_LOGON_INFO *logon_info;
1101         OM_uint32 maj_stat, min_stat;
1102         gss_buffer_desc name_token;
1103         gss_buffer_desc pac;
1104         krb5_keyblock *keyblock;
1105         time_t authtime;
1106         krb5_principal principal;
1107         char *principal_string;
1108         DATA_BLOB pac_blob;
1109
1110         if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
1111             || (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
1112                        gensec_gssapi_state->gss_oid->length) != 0)) {
1113                 DEBUG(1, ("NO session info available for this mech\n"));
1114                 return NT_STATUS_INVALID_PARAMETER;
1115         }
1116
1117         mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
1118         NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
1119
1120         maj_stat = gss_display_name (&min_stat,
1121                                      gensec_gssapi_state->client_name,
1122                                      &name_token,
1123                                      NULL);
1124         if (maj_stat) {
1125                 talloc_free(mem_ctx);
1126                 return NT_STATUS_FOOBAR;
1127         }
1128
1129         principal_string = talloc_strndup(mem_ctx, name_token.value, name_token.length);
1130
1131         gss_release_buffer(&min_stat, &name_token);
1132
1133         if (!principal_string) {
1134                 talloc_free(mem_ctx);
1135                 return NT_STATUS_NO_MEMORY;
1136         }
1137
1138         maj_stat = gss_krb5_copy_service_keyblock(&min_stat,
1139                                                   gensec_gssapi_state->gssapi_context,
1140                                                   &keyblock);
1141
1142         if (maj_stat == 0) {
1143                 maj_stat = gsskrb5_extract_authtime_from_sec_context(&min_stat,
1144                                                                      gensec_gssapi_state->gssapi_context,
1145                                                                      &authtime);
1146         }
1147
1148         if (maj_stat == 0) {
1149                 maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
1150                                                                        gensec_gssapi_state->gssapi_context,
1151                                                                        KRB5_AUTHDATA_WIN2K_PAC,
1152                                                                        &pac);
1153         }
1154
1155         if (maj_stat == 0) {
1156                 pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
1157                 gss_release_buffer(&min_stat, &pac);
1158         }
1159
1160         /* IF we have the PAC - otherwise we need to get this
1161          * data from elsewere - local ldb, or (TODO) lookup of some
1162          * kind...
1163          */
1164         if (maj_stat == 0) {
1165                 krb5_error_code ret;
1166
1167                 ret = krb5_parse_name(gensec_gssapi_state->smb_krb5_context->krb5_context,
1168                                       principal_string, &principal);
1169                 if (ret) {
1170                         talloc_free(mem_ctx);
1171                         return NT_STATUS_INVALID_PARAMETER;
1172                 }
1173
1174                 /* decode and verify the pac */
1175                 nt_status = kerberos_pac_logon_info(mem_ctx, &logon_info, pac_blob,
1176                                                     gensec_gssapi_state->smb_krb5_context->krb5_context,
1177                                                     NULL, keyblock, principal, authtime, NULL);
1178                 krb5_free_principal(gensec_gssapi_state->smb_krb5_context->krb5_context, principal);
1179
1180                 if (NT_STATUS_IS_OK(nt_status)) {
1181                         union netr_Validation validation;
1182                         validation.sam3 = &logon_info->info3;
1183                         nt_status = make_server_info_netlogon_validation(gensec_gssapi_state,
1184                                                                          NULL,
1185                                                                          3, &validation,
1186                                                                          &server_info);
1187                         if (!NT_STATUS_IS_OK(nt_status)) {
1188                                 talloc_free(mem_ctx);
1189                                 return nt_status;
1190                         }
1191                 } else {
1192                         maj_stat = 1;
1193                 }
1194         }
1195
1196         if (maj_stat) {
1197                 DEBUG(1, ("Unable to use PAC, resorting to local user lookup!\n"));
1198                 nt_status = sam_get_server_info_principal(mem_ctx, principal_string,
1199                                                           &server_info);
1200
1201                 if (!NT_STATUS_IS_OK(nt_status)) {
1202                         talloc_free(mem_ctx);
1203                         return nt_status;
1204                 }
1205         }
1206
1207         /* references the server_info into the session_info */
1208         nt_status = auth_generate_session_info(mem_ctx, server_info, &session_info);
1209         if (!NT_STATUS_IS_OK(nt_status)) {
1210                 talloc_free(mem_ctx);
1211                 return nt_status;
1212         }
1213
1214         nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
1215         if (!NT_STATUS_IS_OK(nt_status)) {
1216                 talloc_free(mem_ctx);
1217                 return nt_status;
1218         }
1219
1220         if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
1221                 DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
1222         } else {
1223                 krb5_error_code ret;
1224                 DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
1225                 session_info->credentials = cli_credentials_init(session_info);
1226                 if (!session_info->credentials) {
1227                         talloc_free(mem_ctx);
1228                         return NT_STATUS_NO_MEMORY;
1229                 }
1230
1231                 cli_credentials_set_conf(session_info->credentials);
1232
1233                 ret = cli_credentials_set_client_gss_creds(session_info->credentials,
1234                                                            gensec_gssapi_state->delegated_cred_handle,
1235                                                            CRED_SPECIFIED);
1236                 if (ret) {
1237                         talloc_free(mem_ctx);
1238                         return NT_STATUS_NO_MEMORY;
1239                 }
1240                 /* It has been taken from this place... */
1241                 gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
1242         }
1243         talloc_steal(gensec_gssapi_state, session_info);
1244         talloc_free(mem_ctx);
1245         *_session_info = session_info;
1246
1247         return NT_STATUS_OK;
1248 }
1249
1250 static const char *gensec_gssapi_krb5_oids[] = {
1251         GENSEC_OID_KERBEROS5,
1252         GENSEC_OID_KERBEROS5_OLD,
1253         NULL
1254 };
1255
1256 /* As a server, this could in theory accept any GSSAPI mech */
1257 static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
1258         .name           = "gssapi_krb5",
1259         .auth_type      = DCERPC_AUTH_TYPE_KRB5,
1260         .oid            = gensec_gssapi_krb5_oids,
1261         .client_start   = gensec_gssapi_client_start,
1262         .server_start   = gensec_gssapi_server_start,
1263         .magic          = gensec_gssapi_magic,
1264         .update         = gensec_gssapi_update,
1265         .session_key    = gensec_gssapi_session_key,
1266         .session_info   = gensec_gssapi_session_info,
1267         .sig_size       = gensec_gssapi_sig_size,
1268         .sign_packet    = gensec_gssapi_sign_packet,
1269         .check_packet   = gensec_gssapi_check_packet,
1270         .seal_packet    = gensec_gssapi_seal_packet,
1271         .unseal_packet  = gensec_gssapi_unseal_packet,
1272         .wrap           = gensec_gssapi_wrap,
1273         .unwrap         = gensec_gssapi_unwrap,
1274         .have_feature   = gensec_gssapi_have_feature,
1275         .enabled        = True,
1276         .kerberos       = True
1277 };
1278
1279 /* As a server, this could in theory accept any GSSAPI mech */
1280 static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
1281         .name           = "gssapi_krb5_sasl",
1282         .sasl_name      = "GSSAPI",
1283         .client_start   = gensec_gssapi_sasl_client_start,
1284         .server_start   = gensec_gssapi_sasl_server_start,
1285         .update         = gensec_gssapi_update,
1286         .session_key    = gensec_gssapi_session_key,
1287         .session_info   = gensec_gssapi_session_info,
1288         .wrap           = gensec_gssapi_wrap,
1289         .unwrap         = gensec_gssapi_unwrap,
1290         .have_feature   = gensec_gssapi_have_feature,
1291         .enabled        = True,
1292         .kerberos       = True
1293 };
1294
1295 NTSTATUS gensec_gssapi_init(void)
1296 {
1297         NTSTATUS ret;
1298
1299         ret = gensec_register(&gensec_gssapi_krb5_security_ops);
1300         if (!NT_STATUS_IS_OK(ret)) {
1301                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1302                         gensec_gssapi_krb5_security_ops.name));
1303                 return ret;
1304         }
1305
1306         ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
1307         if (!NT_STATUS_IS_OK(ret)) {
1308                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1309                         gensec_gssapi_sasl_krb5_security_ops.name));
1310                 return ret;
1311         }
1312
1313         return ret;
1314 }