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