source4/auth/gensec/gensec_gssapi.c

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